mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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e05b2a9f03
[ Upstream commit8357bc946a
] Use nf_tables_gc_list_lock spinlock, not nf_tables_destroy_list_lock to protect the gc list. Fixes:5f68718b34
("netfilter: nf_tables: GC transaction API to avoid race with control plane") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Sasha Levin <sashal@kernel.org>
11265 lines
273 KiB
C
11265 lines
273 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
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*
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* Development of this code funded by Astaro AG (http://www.astaro.com/)
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/skbuff.h>
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#include <linux/netlink.h>
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#include <linux/vmalloc.h>
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#include <linux/rhashtable.h>
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#include <linux/audit.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nfnetlink.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_flow_table.h>
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#include <net/netfilter/nf_tables_core.h>
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#include <net/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables_offload.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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#define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
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unsigned int nf_tables_net_id __read_mostly;
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static LIST_HEAD(nf_tables_expressions);
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static LIST_HEAD(nf_tables_objects);
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static LIST_HEAD(nf_tables_flowtables);
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static LIST_HEAD(nf_tables_destroy_list);
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static LIST_HEAD(nf_tables_gc_list);
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static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
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static DEFINE_SPINLOCK(nf_tables_gc_list_lock);
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enum {
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NFT_VALIDATE_SKIP = 0,
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NFT_VALIDATE_NEED,
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NFT_VALIDATE_DO,
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};
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static struct rhltable nft_objname_ht;
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static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
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static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
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static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
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static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
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static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
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static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
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static const struct rhashtable_params nft_chain_ht_params = {
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.head_offset = offsetof(struct nft_chain, rhlhead),
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.key_offset = offsetof(struct nft_chain, name),
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.hashfn = nft_chain_hash,
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.obj_hashfn = nft_chain_hash_obj,
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.obj_cmpfn = nft_chain_hash_cmp,
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.automatic_shrinking = true,
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};
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static const struct rhashtable_params nft_objname_ht_params = {
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.head_offset = offsetof(struct nft_object, rhlhead),
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.key_offset = offsetof(struct nft_object, key),
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.hashfn = nft_objname_hash,
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.obj_hashfn = nft_objname_hash_obj,
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.obj_cmpfn = nft_objname_hash_cmp,
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.automatic_shrinking = true,
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};
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struct nft_audit_data {
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struct nft_table *table;
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int entries;
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int op;
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struct list_head list;
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};
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static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
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[NFT_MSG_NEWTABLE] = AUDIT_NFT_OP_TABLE_REGISTER,
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[NFT_MSG_GETTABLE] = AUDIT_NFT_OP_INVALID,
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[NFT_MSG_DELTABLE] = AUDIT_NFT_OP_TABLE_UNREGISTER,
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[NFT_MSG_NEWCHAIN] = AUDIT_NFT_OP_CHAIN_REGISTER,
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[NFT_MSG_GETCHAIN] = AUDIT_NFT_OP_INVALID,
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[NFT_MSG_DELCHAIN] = AUDIT_NFT_OP_CHAIN_UNREGISTER,
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[NFT_MSG_NEWRULE] = AUDIT_NFT_OP_RULE_REGISTER,
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[NFT_MSG_GETRULE] = AUDIT_NFT_OP_INVALID,
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[NFT_MSG_DELRULE] = AUDIT_NFT_OP_RULE_UNREGISTER,
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[NFT_MSG_NEWSET] = AUDIT_NFT_OP_SET_REGISTER,
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[NFT_MSG_GETSET] = AUDIT_NFT_OP_INVALID,
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[NFT_MSG_DELSET] = AUDIT_NFT_OP_SET_UNREGISTER,
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[NFT_MSG_NEWSETELEM] = AUDIT_NFT_OP_SETELEM_REGISTER,
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[NFT_MSG_GETSETELEM] = AUDIT_NFT_OP_INVALID,
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[NFT_MSG_DELSETELEM] = AUDIT_NFT_OP_SETELEM_UNREGISTER,
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[NFT_MSG_NEWGEN] = AUDIT_NFT_OP_GEN_REGISTER,
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[NFT_MSG_GETGEN] = AUDIT_NFT_OP_INVALID,
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[NFT_MSG_TRACE] = AUDIT_NFT_OP_INVALID,
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[NFT_MSG_NEWOBJ] = AUDIT_NFT_OP_OBJ_REGISTER,
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[NFT_MSG_GETOBJ] = AUDIT_NFT_OP_INVALID,
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[NFT_MSG_DELOBJ] = AUDIT_NFT_OP_OBJ_UNREGISTER,
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[NFT_MSG_GETOBJ_RESET] = AUDIT_NFT_OP_OBJ_RESET,
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[NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
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[NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID,
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[NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
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};
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static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
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{
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switch (table->validate_state) {
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case NFT_VALIDATE_SKIP:
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WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
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break;
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case NFT_VALIDATE_NEED:
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break;
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case NFT_VALIDATE_DO:
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if (new_validate_state == NFT_VALIDATE_NEED)
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return;
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}
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table->validate_state = new_validate_state;
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}
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static void nf_tables_trans_destroy_work(struct work_struct *w);
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static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
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static void nft_trans_gc_work(struct work_struct *work);
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static DECLARE_WORK(trans_gc_work, nft_trans_gc_work);
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static void nft_ctx_init(struct nft_ctx *ctx,
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struct net *net,
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const struct sk_buff *skb,
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const struct nlmsghdr *nlh,
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u8 family,
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struct nft_table *table,
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struct nft_chain *chain,
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const struct nlattr * const *nla)
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{
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ctx->net = net;
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ctx->family = family;
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ctx->level = 0;
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ctx->table = table;
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ctx->chain = chain;
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ctx->nla = nla;
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ctx->portid = NETLINK_CB(skb).portid;
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ctx->report = nlmsg_report(nlh);
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ctx->flags = nlh->nlmsg_flags;
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ctx->seq = nlh->nlmsg_seq;
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}
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static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
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int msg_type, u32 size, gfp_t gfp)
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{
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struct nft_trans *trans;
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trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
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if (trans == NULL)
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return NULL;
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INIT_LIST_HEAD(&trans->list);
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INIT_LIST_HEAD(&trans->binding_list);
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trans->msg_type = msg_type;
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trans->ctx = *ctx;
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return trans;
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}
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static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
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int msg_type, u32 size)
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{
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return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
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}
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static void nft_trans_list_del(struct nft_trans *trans)
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{
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list_del(&trans->list);
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list_del(&trans->binding_list);
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}
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static void nft_trans_destroy(struct nft_trans *trans)
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{
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nft_trans_list_del(trans);
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kfree(trans);
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}
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static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
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bool bind)
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{
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struct nftables_pernet *nft_net;
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struct net *net = ctx->net;
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struct nft_trans *trans;
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if (!nft_set_is_anonymous(set))
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return;
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nft_net = nft_pernet(net);
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list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
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switch (trans->msg_type) {
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case NFT_MSG_NEWSET:
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if (nft_trans_set(trans) == set)
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nft_trans_set_bound(trans) = bind;
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break;
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case NFT_MSG_NEWSETELEM:
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if (nft_trans_elem_set(trans) == set)
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nft_trans_elem_set_bound(trans) = bind;
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break;
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}
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}
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}
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static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
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{
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return __nft_set_trans_bind(ctx, set, true);
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}
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static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
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{
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return __nft_set_trans_bind(ctx, set, false);
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}
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static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
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struct nft_chain *chain, bool bind)
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{
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struct nftables_pernet *nft_net;
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struct net *net = ctx->net;
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struct nft_trans *trans;
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if (!nft_chain_binding(chain))
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return;
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nft_net = nft_pernet(net);
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list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
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switch (trans->msg_type) {
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case NFT_MSG_NEWCHAIN:
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if (nft_trans_chain(trans) == chain)
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nft_trans_chain_bound(trans) = bind;
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break;
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case NFT_MSG_NEWRULE:
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if (trans->ctx.chain == chain)
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nft_trans_rule_bound(trans) = bind;
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break;
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}
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}
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}
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static void nft_chain_trans_bind(const struct nft_ctx *ctx,
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struct nft_chain *chain)
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{
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__nft_chain_trans_bind(ctx, chain, true);
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}
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int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
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{
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if (!nft_chain_binding(chain))
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return 0;
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if (nft_chain_binding(ctx->chain))
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return -EOPNOTSUPP;
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if (chain->bound)
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return -EBUSY;
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if (!nft_use_inc(&chain->use))
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return -EMFILE;
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chain->bound = true;
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nft_chain_trans_bind(ctx, chain);
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return 0;
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}
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void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
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{
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__nft_chain_trans_bind(ctx, chain, false);
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}
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static int nft_netdev_register_hooks(struct net *net,
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struct list_head *hook_list)
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{
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struct nft_hook *hook;
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int err, j;
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j = 0;
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list_for_each_entry(hook, hook_list, list) {
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err = nf_register_net_hook(net, &hook->ops);
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if (err < 0)
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goto err_register;
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j++;
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}
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return 0;
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err_register:
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list_for_each_entry(hook, hook_list, list) {
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if (j-- <= 0)
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break;
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nf_unregister_net_hook(net, &hook->ops);
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}
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return err;
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}
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static void nft_netdev_unregister_hooks(struct net *net,
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struct list_head *hook_list,
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bool release_netdev)
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{
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struct nft_hook *hook, *next;
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list_for_each_entry_safe(hook, next, hook_list, list) {
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nf_unregister_net_hook(net, &hook->ops);
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if (release_netdev) {
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list_del(&hook->list);
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kfree_rcu(hook, rcu);
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}
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}
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}
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static int nf_tables_register_hook(struct net *net,
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const struct nft_table *table,
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struct nft_chain *chain)
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{
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struct nft_base_chain *basechain;
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const struct nf_hook_ops *ops;
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if (table->flags & NFT_TABLE_F_DORMANT ||
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!nft_is_base_chain(chain))
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return 0;
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basechain = nft_base_chain(chain);
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ops = &basechain->ops;
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if (basechain->type->ops_register)
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return basechain->type->ops_register(net, ops);
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if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
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return nft_netdev_register_hooks(net, &basechain->hook_list);
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return nf_register_net_hook(net, &basechain->ops);
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}
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static void __nf_tables_unregister_hook(struct net *net,
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const struct nft_table *table,
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struct nft_chain *chain,
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bool release_netdev)
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{
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struct nft_base_chain *basechain;
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const struct nf_hook_ops *ops;
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if (table->flags & NFT_TABLE_F_DORMANT ||
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!nft_is_base_chain(chain))
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return;
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basechain = nft_base_chain(chain);
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ops = &basechain->ops;
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if (basechain->type->ops_unregister)
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return basechain->type->ops_unregister(net, ops);
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if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
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nft_netdev_unregister_hooks(net, &basechain->hook_list,
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release_netdev);
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else
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nf_unregister_net_hook(net, &basechain->ops);
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}
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static void nf_tables_unregister_hook(struct net *net,
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const struct nft_table *table,
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struct nft_chain *chain)
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{
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return __nf_tables_unregister_hook(net, table, chain, false);
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}
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static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
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{
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struct nftables_pernet *nft_net = nft_pernet(net);
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switch (trans->msg_type) {
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case NFT_MSG_NEWSET:
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if (!nft_trans_set_update(trans) &&
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nft_set_is_anonymous(nft_trans_set(trans)))
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list_add_tail(&trans->binding_list, &nft_net->binding_list);
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break;
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case NFT_MSG_NEWCHAIN:
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if (!nft_trans_chain_update(trans) &&
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nft_chain_binding(nft_trans_chain(trans)))
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list_add_tail(&trans->binding_list, &nft_net->binding_list);
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break;
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}
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list_add_tail(&trans->list, &nft_net->commit_list);
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}
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static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
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{
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struct nft_trans *trans;
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trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
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if (trans == NULL)
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return -ENOMEM;
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if (msg_type == NFT_MSG_NEWTABLE)
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nft_activate_next(ctx->net, ctx->table);
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nft_trans_commit_list_add_tail(ctx->net, trans);
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return 0;
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}
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static int nft_deltable(struct nft_ctx *ctx)
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{
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int err;
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err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
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if (err < 0)
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return err;
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nft_deactivate_next(ctx->net, ctx->table);
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return err;
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}
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static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
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{
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struct nft_trans *trans;
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trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
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if (trans == NULL)
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return ERR_PTR(-ENOMEM);
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if (msg_type == NFT_MSG_NEWCHAIN) {
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nft_activate_next(ctx->net, ctx->chain);
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if (ctx->nla[NFTA_CHAIN_ID]) {
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nft_trans_chain_id(trans) =
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ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
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}
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}
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nft_trans_chain(trans) = ctx->chain;
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nft_trans_commit_list_add_tail(ctx->net, trans);
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return trans;
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}
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static int nft_delchain(struct nft_ctx *ctx)
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{
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struct nft_trans *trans;
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trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
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if (IS_ERR(trans))
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return PTR_ERR(trans);
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nft_use_dec(&ctx->table->use);
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nft_deactivate_next(ctx->net, ctx->chain);
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return 0;
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}
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void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
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{
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struct nft_expr *expr;
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expr = nft_expr_first(rule);
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while (nft_expr_more(rule, expr)) {
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if (expr->ops->activate)
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expr->ops->activate(ctx, expr);
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expr = nft_expr_next(expr);
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}
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}
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void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
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enum nft_trans_phase phase)
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{
|
|
struct nft_expr *expr;
|
|
|
|
expr = nft_expr_first(rule);
|
|
while (nft_expr_more(rule, expr)) {
|
|
if (expr->ops->deactivate)
|
|
expr->ops->deactivate(ctx, expr, phase);
|
|
|
|
expr = nft_expr_next(expr);
|
|
}
|
|
}
|
|
|
|
static int
|
|
nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
|
|
{
|
|
/* You cannot delete the same rule twice */
|
|
if (nft_is_active_next(ctx->net, rule)) {
|
|
nft_deactivate_next(ctx->net, rule);
|
|
nft_use_dec(&ctx->chain->use);
|
|
return 0;
|
|
}
|
|
return -ENOENT;
|
|
}
|
|
|
|
static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
|
|
struct nft_rule *rule)
|
|
{
|
|
struct nft_trans *trans;
|
|
|
|
trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
|
|
if (trans == NULL)
|
|
return NULL;
|
|
|
|
if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
|
|
nft_trans_rule_id(trans) =
|
|
ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
|
|
}
|
|
nft_trans_rule(trans) = rule;
|
|
nft_trans_commit_list_add_tail(ctx->net, trans);
|
|
|
|
return trans;
|
|
}
|
|
|
|
static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
|
|
{
|
|
struct nft_flow_rule *flow;
|
|
struct nft_trans *trans;
|
|
int err;
|
|
|
|
trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
|
|
if (trans == NULL)
|
|
return -ENOMEM;
|
|
|
|
if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
|
|
flow = nft_flow_rule_create(ctx->net, rule);
|
|
if (IS_ERR(flow)) {
|
|
nft_trans_destroy(trans);
|
|
return PTR_ERR(flow);
|
|
}
|
|
|
|
nft_trans_flow_rule(trans) = flow;
|
|
}
|
|
|
|
err = nf_tables_delrule_deactivate(ctx, rule);
|
|
if (err < 0) {
|
|
nft_trans_destroy(trans);
|
|
return err;
|
|
}
|
|
nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nft_delrule_by_chain(struct nft_ctx *ctx)
|
|
{
|
|
struct nft_rule *rule;
|
|
int err;
|
|
|
|
list_for_each_entry(rule, &ctx->chain->rules, list) {
|
|
if (!nft_is_active_next(ctx->net, rule))
|
|
continue;
|
|
|
|
err = nft_delrule(ctx, rule);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
|
|
struct nft_set *set,
|
|
const struct nft_set_desc *desc)
|
|
{
|
|
struct nft_trans *trans;
|
|
|
|
trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
|
|
if (trans == NULL)
|
|
return -ENOMEM;
|
|
|
|
if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
|
|
nft_trans_set_id(trans) =
|
|
ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
|
|
nft_activate_next(ctx->net, set);
|
|
}
|
|
nft_trans_set(trans) = set;
|
|
if (desc) {
|
|
nft_trans_set_update(trans) = true;
|
|
nft_trans_set_gc_int(trans) = desc->gc_int;
|
|
nft_trans_set_timeout(trans) = desc->timeout;
|
|
}
|
|
nft_trans_commit_list_add_tail(ctx->net, trans);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
|
|
struct nft_set *set)
|
|
{
|
|
return __nft_trans_set_add(ctx, msg_type, set, NULL);
|
|
}
|
|
|
|
static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
|
|
struct nft_set *set,
|
|
const struct nft_set_iter *iter,
|
|
struct nft_set_elem *elem)
|
|
{
|
|
nft_setelem_data_deactivate(ctx->net, set, elem);
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct nft_set_elem_catchall {
|
|
struct list_head list;
|
|
struct rcu_head rcu;
|
|
void *elem;
|
|
};
|
|
|
|
static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
|
|
struct nft_set *set)
|
|
{
|
|
u8 genmask = nft_genmask_next(ctx->net);
|
|
struct nft_set_elem_catchall *catchall;
|
|
struct nft_set_elem elem;
|
|
struct nft_set_ext *ext;
|
|
|
|
list_for_each_entry(catchall, &set->catchall_list, list) {
|
|
ext = nft_set_elem_ext(set, catchall->elem);
|
|
if (!nft_set_elem_active(ext, genmask))
|
|
continue;
|
|
|
|
elem.priv = catchall->elem;
|
|
nft_setelem_data_deactivate(ctx->net, set, &elem);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
|
|
{
|
|
struct nft_set_iter iter = {
|
|
.genmask = nft_genmask_next(ctx->net),
|
|
.fn = nft_mapelem_deactivate,
|
|
};
|
|
|
|
set->ops->walk(ctx, set, &iter);
|
|
WARN_ON_ONCE(iter.err);
|
|
|
|
nft_map_catchall_deactivate(ctx, set);
|
|
}
|
|
|
|
static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
|
|
{
|
|
int err;
|
|
|
|
err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
|
|
nft_map_deactivate(ctx, set);
|
|
|
|
nft_deactivate_next(ctx->net, set);
|
|
nft_use_dec(&ctx->table->use);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
|
|
struct nft_object *obj)
|
|
{
|
|
struct nft_trans *trans;
|
|
|
|
trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
|
|
if (trans == NULL)
|
|
return -ENOMEM;
|
|
|
|
if (msg_type == NFT_MSG_NEWOBJ)
|
|
nft_activate_next(ctx->net, obj);
|
|
|
|
nft_trans_obj(trans) = obj;
|
|
nft_trans_commit_list_add_tail(ctx->net, trans);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
|
|
{
|
|
int err;
|
|
|
|
err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
nft_deactivate_next(ctx->net, obj);
|
|
nft_use_dec(&ctx->table->use);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
|
|
struct nft_flowtable *flowtable)
|
|
{
|
|
struct nft_trans *trans;
|
|
|
|
trans = nft_trans_alloc(ctx, msg_type,
|
|
sizeof(struct nft_trans_flowtable));
|
|
if (trans == NULL)
|
|
return -ENOMEM;
|
|
|
|
if (msg_type == NFT_MSG_NEWFLOWTABLE)
|
|
nft_activate_next(ctx->net, flowtable);
|
|
|
|
INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
|
|
nft_trans_flowtable(trans) = flowtable;
|
|
nft_trans_commit_list_add_tail(ctx->net, trans);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nft_delflowtable(struct nft_ctx *ctx,
|
|
struct nft_flowtable *flowtable)
|
|
{
|
|
int err;
|
|
|
|
err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
nft_deactivate_next(ctx->net, flowtable);
|
|
nft_use_dec(&ctx->table->use);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
|
|
{
|
|
int i;
|
|
|
|
for (i = track->regs[dreg].num_reg; i > 0; i--)
|
|
__nft_reg_track_cancel(track, dreg - i);
|
|
}
|
|
|
|
static void __nft_reg_track_update(struct nft_regs_track *track,
|
|
const struct nft_expr *expr,
|
|
u8 dreg, u8 num_reg)
|
|
{
|
|
track->regs[dreg].selector = expr;
|
|
track->regs[dreg].bitwise = NULL;
|
|
track->regs[dreg].num_reg = num_reg;
|
|
}
|
|
|
|
void nft_reg_track_update(struct nft_regs_track *track,
|
|
const struct nft_expr *expr, u8 dreg, u8 len)
|
|
{
|
|
unsigned int regcount;
|
|
int i;
|
|
|
|
__nft_reg_track_clobber(track, dreg);
|
|
|
|
regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
|
|
for (i = 0; i < regcount; i++, dreg++)
|
|
__nft_reg_track_update(track, expr, dreg, i);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_reg_track_update);
|
|
|
|
void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
|
|
{
|
|
unsigned int regcount;
|
|
int i;
|
|
|
|
__nft_reg_track_clobber(track, dreg);
|
|
|
|
regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
|
|
for (i = 0; i < regcount; i++, dreg++)
|
|
__nft_reg_track_cancel(track, dreg);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
|
|
|
|
void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
|
|
{
|
|
track->regs[dreg].selector = NULL;
|
|
track->regs[dreg].bitwise = NULL;
|
|
track->regs[dreg].num_reg = 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
|
|
|
|
/*
|
|
* Tables
|
|
*/
|
|
|
|
static struct nft_table *nft_table_lookup(const struct net *net,
|
|
const struct nlattr *nla,
|
|
u8 family, u8 genmask, u32 nlpid)
|
|
{
|
|
struct nftables_pernet *nft_net;
|
|
struct nft_table *table;
|
|
|
|
if (nla == NULL)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
nft_net = nft_pernet(net);
|
|
list_for_each_entry_rcu(table, &nft_net->tables, list,
|
|
lockdep_is_held(&nft_net->commit_mutex)) {
|
|
if (!nla_strcmp(nla, table->name) &&
|
|
table->family == family &&
|
|
nft_active_genmask(table, genmask)) {
|
|
if (nft_table_has_owner(table) &&
|
|
nlpid && table->nlpid != nlpid)
|
|
return ERR_PTR(-EPERM);
|
|
|
|
return table;
|
|
}
|
|
}
|
|
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
|
|
const struct nlattr *nla,
|
|
u8 genmask, u32 nlpid)
|
|
{
|
|
struct nftables_pernet *nft_net;
|
|
struct nft_table *table;
|
|
|
|
nft_net = nft_pernet(net);
|
|
list_for_each_entry(table, &nft_net->tables, list) {
|
|
if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
|
|
nft_active_genmask(table, genmask)) {
|
|
if (nft_table_has_owner(table) &&
|
|
nlpid && table->nlpid != nlpid)
|
|
return ERR_PTR(-EPERM);
|
|
|
|
return table;
|
|
}
|
|
}
|
|
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
static inline u64 nf_tables_alloc_handle(struct nft_table *table)
|
|
{
|
|
return ++table->hgenerator;
|
|
}
|
|
|
|
static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
|
|
|
|
static const struct nft_chain_type *
|
|
__nft_chain_type_get(u8 family, enum nft_chain_types type)
|
|
{
|
|
if (family >= NFPROTO_NUMPROTO ||
|
|
type >= NFT_CHAIN_T_MAX)
|
|
return NULL;
|
|
|
|
return chain_type[family][type];
|
|
}
|
|
|
|
static const struct nft_chain_type *
|
|
__nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
|
|
{
|
|
const struct nft_chain_type *type;
|
|
int i;
|
|
|
|
for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
|
|
type = __nft_chain_type_get(family, i);
|
|
if (!type)
|
|
continue;
|
|
if (!nla_strcmp(nla, type->name))
|
|
return type;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
struct nft_module_request {
|
|
struct list_head list;
|
|
char module[MODULE_NAME_LEN];
|
|
bool done;
|
|
};
|
|
|
|
#ifdef CONFIG_MODULES
|
|
__printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
|
|
...)
|
|
{
|
|
char module_name[MODULE_NAME_LEN];
|
|
struct nftables_pernet *nft_net;
|
|
struct nft_module_request *req;
|
|
va_list args;
|
|
int ret;
|
|
|
|
va_start(args, fmt);
|
|
ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
|
|
va_end(args);
|
|
if (ret >= MODULE_NAME_LEN)
|
|
return 0;
|
|
|
|
nft_net = nft_pernet(net);
|
|
list_for_each_entry(req, &nft_net->module_list, list) {
|
|
if (!strcmp(req->module, module_name)) {
|
|
if (req->done)
|
|
return 0;
|
|
|
|
/* A request to load this module already exists. */
|
|
return -EAGAIN;
|
|
}
|
|
}
|
|
|
|
req = kmalloc(sizeof(*req), GFP_KERNEL);
|
|
if (!req)
|
|
return -ENOMEM;
|
|
|
|
req->done = false;
|
|
strscpy(req->module, module_name, MODULE_NAME_LEN);
|
|
list_add_tail(&req->list, &nft_net->module_list);
|
|
|
|
return -EAGAIN;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_request_module);
|
|
#endif
|
|
|
|
static void lockdep_nfnl_nft_mutex_not_held(void)
|
|
{
|
|
#ifdef CONFIG_PROVE_LOCKING
|
|
if (debug_locks)
|
|
WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
|
|
#endif
|
|
}
|
|
|
|
static const struct nft_chain_type *
|
|
nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
|
|
u8 family, bool autoload)
|
|
{
|
|
const struct nft_chain_type *type;
|
|
|
|
type = __nf_tables_chain_type_lookup(nla, family);
|
|
if (type != NULL)
|
|
return type;
|
|
|
|
lockdep_nfnl_nft_mutex_not_held();
|
|
#ifdef CONFIG_MODULES
|
|
if (autoload) {
|
|
if (nft_request_module(net, "nft-chain-%u-%.*s", family,
|
|
nla_len(nla),
|
|
(const char *)nla_data(nla)) == -EAGAIN)
|
|
return ERR_PTR(-EAGAIN);
|
|
}
|
|
#endif
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
static __be16 nft_base_seq(const struct net *net)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(net);
|
|
|
|
return htons(nft_net->base_seq & 0xffff);
|
|
}
|
|
|
|
static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
|
|
[NFTA_TABLE_NAME] = { .type = NLA_STRING,
|
|
.len = NFT_TABLE_MAXNAMELEN - 1 },
|
|
[NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
|
|
[NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
|
|
[NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
|
|
.len = NFT_USERDATA_MAXLEN }
|
|
};
|
|
|
|
static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
|
|
u32 portid, u32 seq, int event, u32 flags,
|
|
int family, const struct nft_table *table)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
|
|
event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
|
|
nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
|
|
NFNETLINK_V0, nft_base_seq(net));
|
|
if (!nlh)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
|
|
nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
|
|
nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
|
|
NFTA_TABLE_PAD))
|
|
goto nla_put_failure;
|
|
|
|
if (event == NFT_MSG_DELTABLE) {
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
}
|
|
|
|
if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
|
|
htonl(table->flags & NFT_TABLE_F_MASK)))
|
|
goto nla_put_failure;
|
|
|
|
if (nft_table_has_owner(table) &&
|
|
nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
|
|
goto nla_put_failure;
|
|
|
|
if (table->udata) {
|
|
if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, nlh);
|
|
return -1;
|
|
}
|
|
|
|
struct nftnl_skb_parms {
|
|
bool report;
|
|
};
|
|
#define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
|
|
|
|
static void nft_notify_enqueue(struct sk_buff *skb, bool report,
|
|
struct list_head *notify_list)
|
|
{
|
|
NFT_CB(skb).report = report;
|
|
list_add_tail(&skb->list, notify_list);
|
|
}
|
|
|
|
static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
|
|
{
|
|
struct nftables_pernet *nft_net;
|
|
struct sk_buff *skb;
|
|
u16 flags = 0;
|
|
int err;
|
|
|
|
if (!ctx->report &&
|
|
!nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
|
|
return;
|
|
|
|
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (skb == NULL)
|
|
goto err;
|
|
|
|
if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
|
|
flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
|
|
|
|
err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
|
|
event, flags, ctx->family, ctx->table);
|
|
if (err < 0) {
|
|
kfree_skb(skb);
|
|
goto err;
|
|
}
|
|
|
|
nft_net = nft_pernet(ctx->net);
|
|
nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
|
|
return;
|
|
err:
|
|
nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
|
|
}
|
|
|
|
static int nf_tables_dump_tables(struct sk_buff *skb,
|
|
struct netlink_callback *cb)
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
|
|
struct nftables_pernet *nft_net;
|
|
const struct nft_table *table;
|
|
unsigned int idx = 0, s_idx = cb->args[0];
|
|
struct net *net = sock_net(skb->sk);
|
|
int family = nfmsg->nfgen_family;
|
|
|
|
rcu_read_lock();
|
|
nft_net = nft_pernet(net);
|
|
cb->seq = READ_ONCE(nft_net->base_seq);
|
|
|
|
list_for_each_entry_rcu(table, &nft_net->tables, list) {
|
|
if (family != NFPROTO_UNSPEC && family != table->family)
|
|
continue;
|
|
|
|
if (idx < s_idx)
|
|
goto cont;
|
|
if (idx > s_idx)
|
|
memset(&cb->args[1], 0,
|
|
sizeof(cb->args) - sizeof(cb->args[0]));
|
|
if (!nft_is_active(net, table))
|
|
continue;
|
|
if (nf_tables_fill_table_info(skb, net,
|
|
NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq,
|
|
NFT_MSG_NEWTABLE, NLM_F_MULTI,
|
|
table->family, table) < 0)
|
|
goto done;
|
|
|
|
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
|
|
cont:
|
|
idx++;
|
|
}
|
|
done:
|
|
rcu_read_unlock();
|
|
cb->args[0] = idx;
|
|
return skb->len;
|
|
}
|
|
|
|
static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
struct netlink_dump_control *c)
|
|
{
|
|
int err;
|
|
|
|
if (!try_module_get(THIS_MODULE))
|
|
return -EINVAL;
|
|
|
|
rcu_read_unlock();
|
|
err = netlink_dump_start(nlsk, skb, nlh, c);
|
|
rcu_read_lock();
|
|
module_put(THIS_MODULE);
|
|
|
|
return err;
|
|
}
|
|
|
|
/* called with rcu_read_lock held */
|
|
static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
struct netlink_ext_ack *extack = info->extack;
|
|
u8 genmask = nft_genmask_cur(info->net);
|
|
u8 family = info->nfmsg->nfgen_family;
|
|
const struct nft_table *table;
|
|
struct net *net = info->net;
|
|
struct sk_buff *skb2;
|
|
int err;
|
|
|
|
if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
struct netlink_dump_control c = {
|
|
.dump = nf_tables_dump_tables,
|
|
.module = THIS_MODULE,
|
|
};
|
|
|
|
return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
|
|
}
|
|
|
|
table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
|
|
if (IS_ERR(table)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
|
|
return PTR_ERR(table);
|
|
}
|
|
|
|
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
|
|
if (!skb2)
|
|
return -ENOMEM;
|
|
|
|
err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
|
|
info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
|
|
0, family, table);
|
|
if (err < 0)
|
|
goto err_fill_table_info;
|
|
|
|
return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
|
|
|
|
err_fill_table_info:
|
|
kfree_skb(skb2);
|
|
return err;
|
|
}
|
|
|
|
static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
|
|
{
|
|
struct nft_chain *chain;
|
|
u32 i = 0;
|
|
|
|
list_for_each_entry(chain, &table->chains, list) {
|
|
if (!nft_is_active_next(net, chain))
|
|
continue;
|
|
if (!nft_is_base_chain(chain))
|
|
continue;
|
|
|
|
if (cnt && i++ == cnt)
|
|
break;
|
|
|
|
nf_tables_unregister_hook(net, table, chain);
|
|
}
|
|
}
|
|
|
|
static int nf_tables_table_enable(struct net *net, struct nft_table *table)
|
|
{
|
|
struct nft_chain *chain;
|
|
int err, i = 0;
|
|
|
|
list_for_each_entry(chain, &table->chains, list) {
|
|
if (!nft_is_active_next(net, chain))
|
|
continue;
|
|
if (!nft_is_base_chain(chain))
|
|
continue;
|
|
|
|
err = nf_tables_register_hook(net, table, chain);
|
|
if (err < 0)
|
|
goto err_register_hooks;
|
|
|
|
i++;
|
|
}
|
|
return 0;
|
|
|
|
err_register_hooks:
|
|
if (i)
|
|
nft_table_disable(net, table, i);
|
|
return err;
|
|
}
|
|
|
|
static void nf_tables_table_disable(struct net *net, struct nft_table *table)
|
|
{
|
|
table->flags &= ~NFT_TABLE_F_DORMANT;
|
|
nft_table_disable(net, table, 0);
|
|
table->flags |= NFT_TABLE_F_DORMANT;
|
|
}
|
|
|
|
#define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1)
|
|
#define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0)
|
|
#define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1)
|
|
#define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \
|
|
__NFT_TABLE_F_WAS_AWAKEN)
|
|
|
|
static int nf_tables_updtable(struct nft_ctx *ctx)
|
|
{
|
|
struct nft_trans *trans;
|
|
u32 flags;
|
|
int ret;
|
|
|
|
if (!ctx->nla[NFTA_TABLE_FLAGS])
|
|
return 0;
|
|
|
|
flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
|
|
if (flags & ~NFT_TABLE_F_MASK)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (flags == ctx->table->flags)
|
|
return 0;
|
|
|
|
if ((nft_table_has_owner(ctx->table) &&
|
|
!(flags & NFT_TABLE_F_OWNER)) ||
|
|
(!nft_table_has_owner(ctx->table) &&
|
|
flags & NFT_TABLE_F_OWNER))
|
|
return -EOPNOTSUPP;
|
|
|
|
trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
|
|
sizeof(struct nft_trans_table));
|
|
if (trans == NULL)
|
|
return -ENOMEM;
|
|
|
|
if ((flags & NFT_TABLE_F_DORMANT) &&
|
|
!(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
|
|
ctx->table->flags |= NFT_TABLE_F_DORMANT;
|
|
if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
|
|
ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
|
|
} else if (!(flags & NFT_TABLE_F_DORMANT) &&
|
|
ctx->table->flags & NFT_TABLE_F_DORMANT) {
|
|
ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
|
|
if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
|
|
ret = nf_tables_table_enable(ctx->net, ctx->table);
|
|
if (ret < 0)
|
|
goto err_register_hooks;
|
|
|
|
ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
|
|
}
|
|
}
|
|
|
|
nft_trans_table_update(trans) = true;
|
|
nft_trans_commit_list_add_tail(ctx->net, trans);
|
|
|
|
return 0;
|
|
|
|
err_register_hooks:
|
|
nft_trans_destroy(trans);
|
|
return ret;
|
|
}
|
|
|
|
static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
|
|
{
|
|
const char *name = data;
|
|
|
|
return jhash(name, strlen(name), seed);
|
|
}
|
|
|
|
static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
|
|
{
|
|
const struct nft_chain *chain = data;
|
|
|
|
return nft_chain_hash(chain->name, 0, seed);
|
|
}
|
|
|
|
static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
|
|
const void *ptr)
|
|
{
|
|
const struct nft_chain *chain = ptr;
|
|
const char *name = arg->key;
|
|
|
|
return strcmp(chain->name, name);
|
|
}
|
|
|
|
static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
|
|
{
|
|
const struct nft_object_hash_key *k = data;
|
|
|
|
seed ^= hash_ptr(k->table, 32);
|
|
|
|
return jhash(k->name, strlen(k->name), seed);
|
|
}
|
|
|
|
static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
|
|
{
|
|
const struct nft_object *obj = data;
|
|
|
|
return nft_objname_hash(&obj->key, 0, seed);
|
|
}
|
|
|
|
static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
|
|
const void *ptr)
|
|
{
|
|
const struct nft_object_hash_key *k = arg->key;
|
|
const struct nft_object *obj = ptr;
|
|
|
|
if (obj->key.table != k->table)
|
|
return -1;
|
|
|
|
return strcmp(obj->key.name, k->name);
|
|
}
|
|
|
|
static bool nft_supported_family(u8 family)
|
|
{
|
|
return false
|
|
#ifdef CONFIG_NF_TABLES_INET
|
|
|| family == NFPROTO_INET
|
|
#endif
|
|
#ifdef CONFIG_NF_TABLES_IPV4
|
|
|| family == NFPROTO_IPV4
|
|
#endif
|
|
#ifdef CONFIG_NF_TABLES_ARP
|
|
|| family == NFPROTO_ARP
|
|
#endif
|
|
#ifdef CONFIG_NF_TABLES_NETDEV
|
|
|| family == NFPROTO_NETDEV
|
|
#endif
|
|
#if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
|
|
|| family == NFPROTO_BRIDGE
|
|
#endif
|
|
#ifdef CONFIG_NF_TABLES_IPV6
|
|
|| family == NFPROTO_IPV6
|
|
#endif
|
|
;
|
|
}
|
|
|
|
static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(info->net);
|
|
struct netlink_ext_ack *extack = info->extack;
|
|
u8 genmask = nft_genmask_next(info->net);
|
|
u8 family = info->nfmsg->nfgen_family;
|
|
struct net *net = info->net;
|
|
const struct nlattr *attr;
|
|
struct nft_table *table;
|
|
struct nft_ctx ctx;
|
|
u32 flags = 0;
|
|
int err;
|
|
|
|
if (!nft_supported_family(family))
|
|
return -EOPNOTSUPP;
|
|
|
|
lockdep_assert_held(&nft_net->commit_mutex);
|
|
attr = nla[NFTA_TABLE_NAME];
|
|
table = nft_table_lookup(net, attr, family, genmask,
|
|
NETLINK_CB(skb).portid);
|
|
if (IS_ERR(table)) {
|
|
if (PTR_ERR(table) != -ENOENT)
|
|
return PTR_ERR(table);
|
|
} else {
|
|
if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
|
|
NL_SET_BAD_ATTR(extack, attr);
|
|
return -EEXIST;
|
|
}
|
|
if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
|
|
return -EOPNOTSUPP;
|
|
|
|
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
|
|
|
|
return nf_tables_updtable(&ctx);
|
|
}
|
|
|
|
if (nla[NFTA_TABLE_FLAGS]) {
|
|
flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
|
|
if (flags & ~NFT_TABLE_F_MASK)
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
err = -ENOMEM;
|
|
table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
|
|
if (table == NULL)
|
|
goto err_kzalloc;
|
|
|
|
table->validate_state = nft_net->validate_state;
|
|
table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
|
|
if (table->name == NULL)
|
|
goto err_strdup;
|
|
|
|
if (nla[NFTA_TABLE_USERDATA]) {
|
|
table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
|
|
if (table->udata == NULL)
|
|
goto err_table_udata;
|
|
|
|
table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
|
|
}
|
|
|
|
err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
|
|
if (err)
|
|
goto err_chain_ht;
|
|
|
|
INIT_LIST_HEAD(&table->chains);
|
|
INIT_LIST_HEAD(&table->sets);
|
|
INIT_LIST_HEAD(&table->objects);
|
|
INIT_LIST_HEAD(&table->flowtables);
|
|
table->family = family;
|
|
table->flags = flags;
|
|
table->handle = ++nft_net->table_handle;
|
|
if (table->flags & NFT_TABLE_F_OWNER)
|
|
table->nlpid = NETLINK_CB(skb).portid;
|
|
|
|
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
|
|
err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
|
|
if (err < 0)
|
|
goto err_trans;
|
|
|
|
list_add_tail_rcu(&table->list, &nft_net->tables);
|
|
return 0;
|
|
err_trans:
|
|
rhltable_destroy(&table->chains_ht);
|
|
err_chain_ht:
|
|
kfree(table->udata);
|
|
err_table_udata:
|
|
kfree(table->name);
|
|
err_strdup:
|
|
kfree(table);
|
|
err_kzalloc:
|
|
return err;
|
|
}
|
|
|
|
static int nft_flush_table(struct nft_ctx *ctx)
|
|
{
|
|
struct nft_flowtable *flowtable, *nft;
|
|
struct nft_chain *chain, *nc;
|
|
struct nft_object *obj, *ne;
|
|
struct nft_set *set, *ns;
|
|
int err;
|
|
|
|
list_for_each_entry(chain, &ctx->table->chains, list) {
|
|
if (!nft_is_active_next(ctx->net, chain))
|
|
continue;
|
|
|
|
if (nft_chain_is_bound(chain))
|
|
continue;
|
|
|
|
ctx->chain = chain;
|
|
|
|
err = nft_delrule_by_chain(ctx);
|
|
if (err < 0)
|
|
goto out;
|
|
}
|
|
|
|
list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
|
|
if (!nft_is_active_next(ctx->net, set))
|
|
continue;
|
|
|
|
if (nft_set_is_anonymous(set) &&
|
|
!list_empty(&set->bindings))
|
|
continue;
|
|
|
|
err = nft_delset(ctx, set);
|
|
if (err < 0)
|
|
goto out;
|
|
}
|
|
|
|
list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
|
|
if (!nft_is_active_next(ctx->net, flowtable))
|
|
continue;
|
|
|
|
err = nft_delflowtable(ctx, flowtable);
|
|
if (err < 0)
|
|
goto out;
|
|
}
|
|
|
|
list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
|
|
if (!nft_is_active_next(ctx->net, obj))
|
|
continue;
|
|
|
|
err = nft_delobj(ctx, obj);
|
|
if (err < 0)
|
|
goto out;
|
|
}
|
|
|
|
list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
|
|
if (!nft_is_active_next(ctx->net, chain))
|
|
continue;
|
|
|
|
if (nft_chain_is_bound(chain))
|
|
continue;
|
|
|
|
ctx->chain = chain;
|
|
|
|
err = nft_delchain(ctx);
|
|
if (err < 0)
|
|
goto out;
|
|
}
|
|
|
|
err = nft_deltable(ctx);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int nft_flush(struct nft_ctx *ctx, int family)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(ctx->net);
|
|
const struct nlattr * const *nla = ctx->nla;
|
|
struct nft_table *table, *nt;
|
|
int err = 0;
|
|
|
|
list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
|
|
if (family != AF_UNSPEC && table->family != family)
|
|
continue;
|
|
|
|
ctx->family = table->family;
|
|
|
|
if (!nft_is_active_next(ctx->net, table))
|
|
continue;
|
|
|
|
if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
|
|
continue;
|
|
|
|
if (nla[NFTA_TABLE_NAME] &&
|
|
nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
|
|
continue;
|
|
|
|
ctx->table = table;
|
|
|
|
err = nft_flush_table(ctx);
|
|
if (err < 0)
|
|
goto out;
|
|
}
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
struct netlink_ext_ack *extack = info->extack;
|
|
u8 genmask = nft_genmask_next(info->net);
|
|
u8 family = info->nfmsg->nfgen_family;
|
|
struct net *net = info->net;
|
|
const struct nlattr *attr;
|
|
struct nft_table *table;
|
|
struct nft_ctx ctx;
|
|
|
|
nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
|
|
if (family == AF_UNSPEC ||
|
|
(!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
|
|
return nft_flush(&ctx, family);
|
|
|
|
if (nla[NFTA_TABLE_HANDLE]) {
|
|
attr = nla[NFTA_TABLE_HANDLE];
|
|
table = nft_table_lookup_byhandle(net, attr, genmask,
|
|
NETLINK_CB(skb).portid);
|
|
} else {
|
|
attr = nla[NFTA_TABLE_NAME];
|
|
table = nft_table_lookup(net, attr, family, genmask,
|
|
NETLINK_CB(skb).portid);
|
|
}
|
|
|
|
if (IS_ERR(table)) {
|
|
if (PTR_ERR(table) == -ENOENT &&
|
|
NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
|
|
return 0;
|
|
|
|
NL_SET_BAD_ATTR(extack, attr);
|
|
return PTR_ERR(table);
|
|
}
|
|
|
|
if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
|
|
table->use > 0)
|
|
return -EBUSY;
|
|
|
|
ctx.family = family;
|
|
ctx.table = table;
|
|
|
|
return nft_flush_table(&ctx);
|
|
}
|
|
|
|
static void nf_tables_table_destroy(struct nft_ctx *ctx)
|
|
{
|
|
if (WARN_ON(ctx->table->use > 0))
|
|
return;
|
|
|
|
rhltable_destroy(&ctx->table->chains_ht);
|
|
kfree(ctx->table->name);
|
|
kfree(ctx->table->udata);
|
|
kfree(ctx->table);
|
|
}
|
|
|
|
void nft_register_chain_type(const struct nft_chain_type *ctype)
|
|
{
|
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
|
if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
|
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
|
return;
|
|
}
|
|
chain_type[ctype->family][ctype->type] = ctype;
|
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_register_chain_type);
|
|
|
|
void nft_unregister_chain_type(const struct nft_chain_type *ctype)
|
|
{
|
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
|
chain_type[ctype->family][ctype->type] = NULL;
|
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
|
|
|
|
/*
|
|
* Chains
|
|
*/
|
|
|
|
static struct nft_chain *
|
|
nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
|
|
{
|
|
struct nft_chain *chain;
|
|
|
|
list_for_each_entry(chain, &table->chains, list) {
|
|
if (chain->handle == handle &&
|
|
nft_active_genmask(chain, genmask))
|
|
return chain;
|
|
}
|
|
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
static bool lockdep_commit_lock_is_held(const struct net *net)
|
|
{
|
|
#ifdef CONFIG_PROVE_LOCKING
|
|
struct nftables_pernet *nft_net = nft_pernet(net);
|
|
|
|
return lockdep_is_held(&nft_net->commit_mutex);
|
|
#else
|
|
return true;
|
|
#endif
|
|
}
|
|
|
|
static struct nft_chain *nft_chain_lookup(struct net *net,
|
|
struct nft_table *table,
|
|
const struct nlattr *nla, u8 genmask)
|
|
{
|
|
char search[NFT_CHAIN_MAXNAMELEN + 1];
|
|
struct rhlist_head *tmp, *list;
|
|
struct nft_chain *chain;
|
|
|
|
if (nla == NULL)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
nla_strscpy(search, nla, sizeof(search));
|
|
|
|
WARN_ON(!rcu_read_lock_held() &&
|
|
!lockdep_commit_lock_is_held(net));
|
|
|
|
chain = ERR_PTR(-ENOENT);
|
|
rcu_read_lock();
|
|
list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
|
|
if (!list)
|
|
goto out_unlock;
|
|
|
|
rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
|
|
if (nft_active_genmask(chain, genmask))
|
|
goto out_unlock;
|
|
}
|
|
chain = ERR_PTR(-ENOENT);
|
|
out_unlock:
|
|
rcu_read_unlock();
|
|
return chain;
|
|
}
|
|
|
|
static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
|
|
[NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
|
|
.len = NFT_TABLE_MAXNAMELEN - 1 },
|
|
[NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
|
|
[NFTA_CHAIN_NAME] = { .type = NLA_STRING,
|
|
.len = NFT_CHAIN_MAXNAMELEN - 1 },
|
|
[NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
|
|
[NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
|
|
[NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
|
|
.len = NFT_MODULE_AUTOLOAD_LIMIT },
|
|
[NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
|
|
[NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
|
|
[NFTA_CHAIN_ID] = { .type = NLA_U32 },
|
|
[NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
|
|
.len = NFT_USERDATA_MAXLEN },
|
|
};
|
|
|
|
static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
|
|
[NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
|
|
[NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
|
|
[NFTA_HOOK_DEV] = { .type = NLA_STRING,
|
|
.len = IFNAMSIZ - 1 },
|
|
};
|
|
|
|
static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
|
|
{
|
|
struct nft_stats *cpu_stats, total;
|
|
struct nlattr *nest;
|
|
unsigned int seq;
|
|
u64 pkts, bytes;
|
|
int cpu;
|
|
|
|
if (!stats)
|
|
return 0;
|
|
|
|
memset(&total, 0, sizeof(total));
|
|
for_each_possible_cpu(cpu) {
|
|
cpu_stats = per_cpu_ptr(stats, cpu);
|
|
do {
|
|
seq = u64_stats_fetch_begin(&cpu_stats->syncp);
|
|
pkts = cpu_stats->pkts;
|
|
bytes = cpu_stats->bytes;
|
|
} while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
|
|
total.pkts += pkts;
|
|
total.bytes += bytes;
|
|
}
|
|
nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
|
|
NFTA_COUNTER_PAD) ||
|
|
nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
|
|
NFTA_COUNTER_PAD))
|
|
goto nla_put_failure;
|
|
|
|
nla_nest_end(skb, nest);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -ENOSPC;
|
|
}
|
|
|
|
static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
|
|
const struct nft_base_chain *basechain,
|
|
const struct list_head *hook_list)
|
|
{
|
|
const struct nf_hook_ops *ops = &basechain->ops;
|
|
struct nft_hook *hook, *first = NULL;
|
|
struct nlattr *nest, *nest_devs;
|
|
int n = 0;
|
|
|
|
nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
|
|
goto nla_put_failure;
|
|
if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
|
|
goto nla_put_failure;
|
|
|
|
if (nft_base_chain_netdev(family, ops->hooknum)) {
|
|
nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
|
|
if (!nest_devs)
|
|
goto nla_put_failure;
|
|
|
|
if (!hook_list)
|
|
hook_list = &basechain->hook_list;
|
|
|
|
list_for_each_entry(hook, hook_list, list) {
|
|
if (!first)
|
|
first = hook;
|
|
|
|
if (nla_put_string(skb, NFTA_DEVICE_NAME,
|
|
hook->ops.dev->name))
|
|
goto nla_put_failure;
|
|
n++;
|
|
}
|
|
nla_nest_end(skb, nest_devs);
|
|
|
|
if (n == 1 &&
|
|
nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
|
|
goto nla_put_failure;
|
|
}
|
|
nla_nest_end(skb, nest);
|
|
|
|
return 0;
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
|
|
u32 portid, u32 seq, int event, u32 flags,
|
|
int family, const struct nft_table *table,
|
|
const struct nft_chain *chain,
|
|
const struct list_head *hook_list)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
|
|
event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
|
|
nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
|
|
NFNETLINK_V0, nft_base_seq(net));
|
|
if (!nlh)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
|
|
nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
|
|
nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
|
|
NFTA_CHAIN_PAD))
|
|
goto nla_put_failure;
|
|
|
|
if (event == NFT_MSG_DELCHAIN && !hook_list) {
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
}
|
|
|
|
if (nft_is_base_chain(chain)) {
|
|
const struct nft_base_chain *basechain = nft_base_chain(chain);
|
|
struct nft_stats __percpu *stats;
|
|
|
|
if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
|
|
htonl(basechain->policy)))
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
|
|
goto nla_put_failure;
|
|
|
|
stats = rcu_dereference_check(basechain->stats,
|
|
lockdep_commit_lock_is_held(net));
|
|
if (nft_dump_stats(skb, stats))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
if (chain->flags &&
|
|
nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
|
|
goto nla_put_failure;
|
|
|
|
if (chain->udata &&
|
|
nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
|
|
goto nla_put_failure;
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, nlh);
|
|
return -1;
|
|
}
|
|
|
|
static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
|
|
const struct list_head *hook_list)
|
|
{
|
|
struct nftables_pernet *nft_net;
|
|
struct sk_buff *skb;
|
|
u16 flags = 0;
|
|
int err;
|
|
|
|
if (!ctx->report &&
|
|
!nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
|
|
return;
|
|
|
|
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (skb == NULL)
|
|
goto err;
|
|
|
|
if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
|
|
flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
|
|
|
|
err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
|
|
event, flags, ctx->family, ctx->table,
|
|
ctx->chain, hook_list);
|
|
if (err < 0) {
|
|
kfree_skb(skb);
|
|
goto err;
|
|
}
|
|
|
|
nft_net = nft_pernet(ctx->net);
|
|
nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
|
|
return;
|
|
err:
|
|
nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
|
|
}
|
|
|
|
static int nf_tables_dump_chains(struct sk_buff *skb,
|
|
struct netlink_callback *cb)
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
|
|
unsigned int idx = 0, s_idx = cb->args[0];
|
|
struct net *net = sock_net(skb->sk);
|
|
int family = nfmsg->nfgen_family;
|
|
struct nftables_pernet *nft_net;
|
|
const struct nft_table *table;
|
|
const struct nft_chain *chain;
|
|
|
|
rcu_read_lock();
|
|
nft_net = nft_pernet(net);
|
|
cb->seq = READ_ONCE(nft_net->base_seq);
|
|
|
|
list_for_each_entry_rcu(table, &nft_net->tables, list) {
|
|
if (family != NFPROTO_UNSPEC && family != table->family)
|
|
continue;
|
|
|
|
list_for_each_entry_rcu(chain, &table->chains, list) {
|
|
if (idx < s_idx)
|
|
goto cont;
|
|
if (idx > s_idx)
|
|
memset(&cb->args[1], 0,
|
|
sizeof(cb->args) - sizeof(cb->args[0]));
|
|
if (!nft_is_active(net, chain))
|
|
continue;
|
|
if (nf_tables_fill_chain_info(skb, net,
|
|
NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq,
|
|
NFT_MSG_NEWCHAIN,
|
|
NLM_F_MULTI,
|
|
table->family, table,
|
|
chain, NULL) < 0)
|
|
goto done;
|
|
|
|
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
|
|
cont:
|
|
idx++;
|
|
}
|
|
}
|
|
done:
|
|
rcu_read_unlock();
|
|
cb->args[0] = idx;
|
|
return skb->len;
|
|
}
|
|
|
|
/* called with rcu_read_lock held */
|
|
static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
struct netlink_ext_ack *extack = info->extack;
|
|
u8 genmask = nft_genmask_cur(info->net);
|
|
u8 family = info->nfmsg->nfgen_family;
|
|
const struct nft_chain *chain;
|
|
struct net *net = info->net;
|
|
struct nft_table *table;
|
|
struct sk_buff *skb2;
|
|
int err;
|
|
|
|
if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
struct netlink_dump_control c = {
|
|
.dump = nf_tables_dump_chains,
|
|
.module = THIS_MODULE,
|
|
};
|
|
|
|
return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
|
|
}
|
|
|
|
table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
|
|
if (IS_ERR(table)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
|
|
return PTR_ERR(table);
|
|
}
|
|
|
|
chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
|
|
if (IS_ERR(chain)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
|
|
return PTR_ERR(chain);
|
|
}
|
|
|
|
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
|
|
if (!skb2)
|
|
return -ENOMEM;
|
|
|
|
err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
|
|
info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
|
|
0, family, table, chain, NULL);
|
|
if (err < 0)
|
|
goto err_fill_chain_info;
|
|
|
|
return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
|
|
|
|
err_fill_chain_info:
|
|
kfree_skb(skb2);
|
|
return err;
|
|
}
|
|
|
|
static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
|
|
[NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
|
|
[NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
|
|
};
|
|
|
|
static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
|
|
{
|
|
struct nlattr *tb[NFTA_COUNTER_MAX+1];
|
|
struct nft_stats __percpu *newstats;
|
|
struct nft_stats *stats;
|
|
int err;
|
|
|
|
err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
|
|
nft_counter_policy, NULL);
|
|
if (err < 0)
|
|
return ERR_PTR(err);
|
|
|
|
if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
newstats = netdev_alloc_pcpu_stats(struct nft_stats);
|
|
if (newstats == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
/* Restore old counters on this cpu, no problem. Per-cpu statistics
|
|
* are not exposed to userspace.
|
|
*/
|
|
preempt_disable();
|
|
stats = this_cpu_ptr(newstats);
|
|
stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
|
|
stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
|
|
preempt_enable();
|
|
|
|
return newstats;
|
|
}
|
|
|
|
static void nft_chain_stats_replace(struct nft_trans *trans)
|
|
{
|
|
struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
|
|
|
|
if (!nft_trans_chain_stats(trans))
|
|
return;
|
|
|
|
nft_trans_chain_stats(trans) =
|
|
rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
|
|
lockdep_commit_lock_is_held(trans->ctx.net));
|
|
|
|
if (!nft_trans_chain_stats(trans))
|
|
static_branch_inc(&nft_counters_enabled);
|
|
}
|
|
|
|
static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
|
|
{
|
|
struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
|
|
struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
|
|
|
|
if (g0 != g1)
|
|
kvfree(g1);
|
|
kvfree(g0);
|
|
|
|
/* should be NULL either via abort or via successful commit */
|
|
WARN_ON_ONCE(chain->blob_next);
|
|
kvfree(chain->blob_next);
|
|
}
|
|
|
|
void nf_tables_chain_destroy(struct nft_ctx *ctx)
|
|
{
|
|
struct nft_chain *chain = ctx->chain;
|
|
struct nft_hook *hook, *next;
|
|
|
|
if (WARN_ON(chain->use > 0))
|
|
return;
|
|
|
|
/* no concurrent access possible anymore */
|
|
nf_tables_chain_free_chain_rules(chain);
|
|
|
|
if (nft_is_base_chain(chain)) {
|
|
struct nft_base_chain *basechain = nft_base_chain(chain);
|
|
|
|
if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
|
|
list_for_each_entry_safe(hook, next,
|
|
&basechain->hook_list, list) {
|
|
list_del_rcu(&hook->list);
|
|
kfree_rcu(hook, rcu);
|
|
}
|
|
}
|
|
module_put(basechain->type->owner);
|
|
if (rcu_access_pointer(basechain->stats)) {
|
|
static_branch_dec(&nft_counters_enabled);
|
|
free_percpu(rcu_dereference_raw(basechain->stats));
|
|
}
|
|
kfree(chain->name);
|
|
kfree(chain->udata);
|
|
kfree(basechain);
|
|
} else {
|
|
kfree(chain->name);
|
|
kfree(chain->udata);
|
|
kfree(chain);
|
|
}
|
|
}
|
|
|
|
static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
|
|
const struct nlattr *attr)
|
|
{
|
|
struct net_device *dev;
|
|
char ifname[IFNAMSIZ];
|
|
struct nft_hook *hook;
|
|
int err;
|
|
|
|
hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
|
|
if (!hook) {
|
|
err = -ENOMEM;
|
|
goto err_hook_alloc;
|
|
}
|
|
|
|
nla_strscpy(ifname, attr, IFNAMSIZ);
|
|
/* nf_tables_netdev_event() is called under rtnl_mutex, this is
|
|
* indirectly serializing all the other holders of the commit_mutex with
|
|
* the rtnl_mutex.
|
|
*/
|
|
dev = __dev_get_by_name(net, ifname);
|
|
if (!dev) {
|
|
err = -ENOENT;
|
|
goto err_hook_dev;
|
|
}
|
|
hook->ops.dev = dev;
|
|
|
|
return hook;
|
|
|
|
err_hook_dev:
|
|
kfree(hook);
|
|
err_hook_alloc:
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
|
|
const struct nft_hook *this)
|
|
{
|
|
struct nft_hook *hook;
|
|
|
|
list_for_each_entry(hook, hook_list, list) {
|
|
if (this->ops.dev == hook->ops.dev)
|
|
return hook;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int nf_tables_parse_netdev_hooks(struct net *net,
|
|
const struct nlattr *attr,
|
|
struct list_head *hook_list,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct nft_hook *hook, *next;
|
|
const struct nlattr *tmp;
|
|
int rem, n = 0, err;
|
|
|
|
nla_for_each_nested(tmp, attr, rem) {
|
|
if (nla_type(tmp) != NFTA_DEVICE_NAME) {
|
|
err = -EINVAL;
|
|
goto err_hook;
|
|
}
|
|
|
|
hook = nft_netdev_hook_alloc(net, tmp);
|
|
if (IS_ERR(hook)) {
|
|
NL_SET_BAD_ATTR(extack, tmp);
|
|
err = PTR_ERR(hook);
|
|
goto err_hook;
|
|
}
|
|
if (nft_hook_list_find(hook_list, hook)) {
|
|
NL_SET_BAD_ATTR(extack, tmp);
|
|
kfree(hook);
|
|
err = -EEXIST;
|
|
goto err_hook;
|
|
}
|
|
list_add_tail(&hook->list, hook_list);
|
|
n++;
|
|
|
|
if (n == NFT_NETDEVICE_MAX) {
|
|
err = -EFBIG;
|
|
goto err_hook;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_hook:
|
|
list_for_each_entry_safe(hook, next, hook_list, list) {
|
|
list_del(&hook->list);
|
|
kfree(hook);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
struct nft_chain_hook {
|
|
u32 num;
|
|
s32 priority;
|
|
const struct nft_chain_type *type;
|
|
struct list_head list;
|
|
};
|
|
|
|
static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
|
|
struct list_head *hook_list,
|
|
struct netlink_ext_ack *extack, u32 flags)
|
|
{
|
|
struct nft_hook *hook;
|
|
int err;
|
|
|
|
if (tb[NFTA_HOOK_DEV]) {
|
|
hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
|
|
if (IS_ERR(hook)) {
|
|
NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
|
|
return PTR_ERR(hook);
|
|
}
|
|
|
|
list_add_tail(&hook->list, hook_list);
|
|
} else if (tb[NFTA_HOOK_DEVS]) {
|
|
err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
|
|
hook_list, extack);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
}
|
|
|
|
if (flags & NFT_CHAIN_HW_OFFLOAD &&
|
|
list_empty(hook_list))
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nft_chain_parse_hook(struct net *net,
|
|
struct nft_base_chain *basechain,
|
|
const struct nlattr * const nla[],
|
|
struct nft_chain_hook *hook, u8 family,
|
|
u32 flags, struct netlink_ext_ack *extack)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(net);
|
|
struct nlattr *ha[NFTA_HOOK_MAX + 1];
|
|
const struct nft_chain_type *type;
|
|
int err;
|
|
|
|
lockdep_assert_held(&nft_net->commit_mutex);
|
|
lockdep_nfnl_nft_mutex_not_held();
|
|
|
|
err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
|
|
nla[NFTA_CHAIN_HOOK],
|
|
nft_hook_policy, NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (!basechain) {
|
|
if (!ha[NFTA_HOOK_HOOKNUM] ||
|
|
!ha[NFTA_HOOK_PRIORITY]) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
|
|
return -ENOENT;
|
|
}
|
|
|
|
hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
|
|
hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
|
|
|
|
type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
|
|
if (!type)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (nla[NFTA_CHAIN_TYPE]) {
|
|
type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
|
|
family, true);
|
|
if (IS_ERR(type)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
|
|
return PTR_ERR(type);
|
|
}
|
|
}
|
|
if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (type->type == NFT_CHAIN_T_NAT &&
|
|
hook->priority <= NF_IP_PRI_CONNTRACK)
|
|
return -EOPNOTSUPP;
|
|
} else {
|
|
if (ha[NFTA_HOOK_HOOKNUM]) {
|
|
hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
|
|
if (hook->num != basechain->ops.hooknum)
|
|
return -EOPNOTSUPP;
|
|
}
|
|
if (ha[NFTA_HOOK_PRIORITY]) {
|
|
hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
|
|
if (hook->priority != basechain->ops.priority)
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
type = basechain->type;
|
|
}
|
|
|
|
if (!try_module_get(type->owner)) {
|
|
if (nla[NFTA_CHAIN_TYPE])
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
|
|
return -ENOENT;
|
|
}
|
|
|
|
hook->type = type;
|
|
|
|
INIT_LIST_HEAD(&hook->list);
|
|
if (nft_base_chain_netdev(family, hook->num)) {
|
|
err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
|
|
if (err < 0) {
|
|
module_put(type->owner);
|
|
return err;
|
|
}
|
|
} else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
|
|
module_put(type->owner);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void nft_chain_release_hook(struct nft_chain_hook *hook)
|
|
{
|
|
struct nft_hook *h, *next;
|
|
|
|
list_for_each_entry_safe(h, next, &hook->list, list) {
|
|
list_del(&h->list);
|
|
kfree(h);
|
|
}
|
|
module_put(hook->type->owner);
|
|
}
|
|
|
|
static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
|
|
{
|
|
struct nft_rule_dp_last *lrule;
|
|
|
|
BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
|
|
|
|
lrule = (struct nft_rule_dp_last *)ptr;
|
|
lrule->end.is_last = 1;
|
|
lrule->chain = chain;
|
|
/* blob size does not include the trailer rule */
|
|
}
|
|
|
|
static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
|
|
unsigned int size)
|
|
{
|
|
struct nft_rule_blob *blob;
|
|
|
|
if (size > INT_MAX)
|
|
return NULL;
|
|
|
|
size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
|
|
|
|
blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
|
|
if (!blob)
|
|
return NULL;
|
|
|
|
blob->size = 0;
|
|
nft_last_rule(chain, blob->data);
|
|
|
|
return blob;
|
|
}
|
|
|
|
static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
|
|
const struct nft_chain_hook *hook,
|
|
struct nft_chain *chain)
|
|
{
|
|
ops->pf = family;
|
|
ops->hooknum = hook->num;
|
|
ops->priority = hook->priority;
|
|
ops->priv = chain;
|
|
ops->hook = hook->type->hooks[ops->hooknum];
|
|
ops->hook_ops_type = NF_HOOK_OP_NF_TABLES;
|
|
}
|
|
|
|
static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
|
|
struct nft_chain_hook *hook, u32 flags)
|
|
{
|
|
struct nft_chain *chain;
|
|
struct nft_hook *h;
|
|
|
|
basechain->type = hook->type;
|
|
INIT_LIST_HEAD(&basechain->hook_list);
|
|
chain = &basechain->chain;
|
|
|
|
if (nft_base_chain_netdev(family, hook->num)) {
|
|
list_splice_init(&hook->list, &basechain->hook_list);
|
|
list_for_each_entry(h, &basechain->hook_list, list)
|
|
nft_basechain_hook_init(&h->ops, family, hook, chain);
|
|
}
|
|
nft_basechain_hook_init(&basechain->ops, family, hook, chain);
|
|
|
|
chain->flags |= NFT_CHAIN_BASE | flags;
|
|
basechain->policy = NF_ACCEPT;
|
|
if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
|
|
!nft_chain_offload_support(basechain)) {
|
|
list_splice_init(&basechain->hook_list, &hook->list);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
flow_block_init(&basechain->flow_block);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
|
|
{
|
|
int err;
|
|
|
|
err = rhltable_insert_key(&table->chains_ht, chain->name,
|
|
&chain->rhlhead, nft_chain_ht_params);
|
|
if (err)
|
|
return err;
|
|
|
|
list_add_tail_rcu(&chain->list, &table->chains);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static u64 chain_id;
|
|
|
|
static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
|
|
u8 policy, u32 flags,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
const struct nlattr * const *nla = ctx->nla;
|
|
struct nft_table *table = ctx->table;
|
|
struct nft_base_chain *basechain;
|
|
struct net *net = ctx->net;
|
|
char name[NFT_NAME_MAXLEN];
|
|
struct nft_rule_blob *blob;
|
|
struct nft_trans *trans;
|
|
struct nft_chain *chain;
|
|
int err;
|
|
|
|
if (nla[NFTA_CHAIN_HOOK]) {
|
|
struct nft_stats __percpu *stats = NULL;
|
|
struct nft_chain_hook hook = {};
|
|
|
|
if (flags & NFT_CHAIN_BINDING)
|
|
return -EOPNOTSUPP;
|
|
|
|
err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
|
|
extack);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
|
|
if (basechain == NULL) {
|
|
nft_chain_release_hook(&hook);
|
|
return -ENOMEM;
|
|
}
|
|
chain = &basechain->chain;
|
|
|
|
if (nla[NFTA_CHAIN_COUNTERS]) {
|
|
stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
|
|
if (IS_ERR(stats)) {
|
|
nft_chain_release_hook(&hook);
|
|
kfree(basechain);
|
|
return PTR_ERR(stats);
|
|
}
|
|
rcu_assign_pointer(basechain->stats, stats);
|
|
}
|
|
|
|
err = nft_basechain_init(basechain, family, &hook, flags);
|
|
if (err < 0) {
|
|
nft_chain_release_hook(&hook);
|
|
kfree(basechain);
|
|
free_percpu(stats);
|
|
return err;
|
|
}
|
|
if (stats)
|
|
static_branch_inc(&nft_counters_enabled);
|
|
} else {
|
|
if (flags & NFT_CHAIN_BASE)
|
|
return -EINVAL;
|
|
if (flags & NFT_CHAIN_HW_OFFLOAD)
|
|
return -EOPNOTSUPP;
|
|
|
|
chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
|
|
if (chain == NULL)
|
|
return -ENOMEM;
|
|
|
|
chain->flags = flags;
|
|
}
|
|
ctx->chain = chain;
|
|
|
|
INIT_LIST_HEAD(&chain->rules);
|
|
chain->handle = nf_tables_alloc_handle(table);
|
|
chain->table = table;
|
|
|
|
if (nla[NFTA_CHAIN_NAME]) {
|
|
chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
|
|
} else {
|
|
if (!(flags & NFT_CHAIN_BINDING)) {
|
|
err = -EINVAL;
|
|
goto err_destroy_chain;
|
|
}
|
|
|
|
snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
|
|
chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
|
|
}
|
|
|
|
if (!chain->name) {
|
|
err = -ENOMEM;
|
|
goto err_destroy_chain;
|
|
}
|
|
|
|
if (nla[NFTA_CHAIN_USERDATA]) {
|
|
chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
|
|
if (chain->udata == NULL) {
|
|
err = -ENOMEM;
|
|
goto err_destroy_chain;
|
|
}
|
|
chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
|
|
}
|
|
|
|
blob = nf_tables_chain_alloc_rules(chain, 0);
|
|
if (!blob) {
|
|
err = -ENOMEM;
|
|
goto err_destroy_chain;
|
|
}
|
|
|
|
RCU_INIT_POINTER(chain->blob_gen_0, blob);
|
|
RCU_INIT_POINTER(chain->blob_gen_1, blob);
|
|
|
|
err = nf_tables_register_hook(net, table, chain);
|
|
if (err < 0)
|
|
goto err_destroy_chain;
|
|
|
|
if (!nft_use_inc(&table->use)) {
|
|
err = -EMFILE;
|
|
goto err_use;
|
|
}
|
|
|
|
trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
|
|
if (IS_ERR(trans)) {
|
|
err = PTR_ERR(trans);
|
|
goto err_unregister_hook;
|
|
}
|
|
|
|
nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
|
|
if (nft_is_base_chain(chain))
|
|
nft_trans_chain_policy(trans) = policy;
|
|
|
|
err = nft_chain_add(table, chain);
|
|
if (err < 0) {
|
|
nft_trans_destroy(trans);
|
|
goto err_unregister_hook;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_unregister_hook:
|
|
nft_use_dec_restore(&table->use);
|
|
err_use:
|
|
nf_tables_unregister_hook(net, table, chain);
|
|
err_destroy_chain:
|
|
nf_tables_chain_destroy(ctx);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
|
|
u32 flags, const struct nlattr *attr,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
const struct nlattr * const *nla = ctx->nla;
|
|
struct nft_base_chain *basechain = NULL;
|
|
struct nft_table *table = ctx->table;
|
|
struct nft_chain *chain = ctx->chain;
|
|
struct nft_chain_hook hook = {};
|
|
struct nft_stats *stats = NULL;
|
|
struct nft_hook *h, *next;
|
|
struct nf_hook_ops *ops;
|
|
struct nft_trans *trans;
|
|
bool unregister = false;
|
|
int err;
|
|
|
|
if (chain->flags ^ flags)
|
|
return -EOPNOTSUPP;
|
|
|
|
INIT_LIST_HEAD(&hook.list);
|
|
|
|
if (nla[NFTA_CHAIN_HOOK]) {
|
|
if (!nft_is_base_chain(chain)) {
|
|
NL_SET_BAD_ATTR(extack, attr);
|
|
return -EEXIST;
|
|
}
|
|
|
|
basechain = nft_base_chain(chain);
|
|
err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
|
|
ctx->family, flags, extack);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (basechain->type != hook.type) {
|
|
nft_chain_release_hook(&hook);
|
|
NL_SET_BAD_ATTR(extack, attr);
|
|
return -EEXIST;
|
|
}
|
|
|
|
if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
|
|
list_for_each_entry_safe(h, next, &hook.list, list) {
|
|
h->ops.pf = basechain->ops.pf;
|
|
h->ops.hooknum = basechain->ops.hooknum;
|
|
h->ops.priority = basechain->ops.priority;
|
|
h->ops.priv = basechain->ops.priv;
|
|
h->ops.hook = basechain->ops.hook;
|
|
|
|
if (nft_hook_list_find(&basechain->hook_list, h)) {
|
|
list_del(&h->list);
|
|
kfree(h);
|
|
}
|
|
}
|
|
} else {
|
|
ops = &basechain->ops;
|
|
if (ops->hooknum != hook.num ||
|
|
ops->priority != hook.priority) {
|
|
nft_chain_release_hook(&hook);
|
|
NL_SET_BAD_ATTR(extack, attr);
|
|
return -EEXIST;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (nla[NFTA_CHAIN_HANDLE] &&
|
|
nla[NFTA_CHAIN_NAME]) {
|
|
struct nft_chain *chain2;
|
|
|
|
chain2 = nft_chain_lookup(ctx->net, table,
|
|
nla[NFTA_CHAIN_NAME], genmask);
|
|
if (!IS_ERR(chain2)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
|
|
err = -EEXIST;
|
|
goto err_hooks;
|
|
}
|
|
}
|
|
|
|
if (nla[NFTA_CHAIN_COUNTERS]) {
|
|
if (!nft_is_base_chain(chain)) {
|
|
err = -EOPNOTSUPP;
|
|
goto err_hooks;
|
|
}
|
|
|
|
stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
|
|
if (IS_ERR(stats)) {
|
|
err = PTR_ERR(stats);
|
|
goto err_hooks;
|
|
}
|
|
}
|
|
|
|
if (!(table->flags & NFT_TABLE_F_DORMANT) &&
|
|
nft_is_base_chain(chain) &&
|
|
!list_empty(&hook.list)) {
|
|
basechain = nft_base_chain(chain);
|
|
ops = &basechain->ops;
|
|
|
|
if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
|
|
err = nft_netdev_register_hooks(ctx->net, &hook.list);
|
|
if (err < 0)
|
|
goto err_hooks;
|
|
}
|
|
}
|
|
|
|
unregister = true;
|
|
err = -ENOMEM;
|
|
trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
|
|
sizeof(struct nft_trans_chain));
|
|
if (trans == NULL)
|
|
goto err_trans;
|
|
|
|
nft_trans_chain_stats(trans) = stats;
|
|
nft_trans_chain_update(trans) = true;
|
|
|
|
if (nla[NFTA_CHAIN_POLICY])
|
|
nft_trans_chain_policy(trans) = policy;
|
|
else
|
|
nft_trans_chain_policy(trans) = -1;
|
|
|
|
if (nla[NFTA_CHAIN_HANDLE] &&
|
|
nla[NFTA_CHAIN_NAME]) {
|
|
struct nftables_pernet *nft_net = nft_pernet(ctx->net);
|
|
struct nft_trans *tmp;
|
|
char *name;
|
|
|
|
err = -ENOMEM;
|
|
name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
|
|
if (!name)
|
|
goto err_trans;
|
|
|
|
err = -EEXIST;
|
|
list_for_each_entry(tmp, &nft_net->commit_list, list) {
|
|
if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
|
|
tmp->ctx.table == table &&
|
|
nft_trans_chain_update(tmp) &&
|
|
nft_trans_chain_name(tmp) &&
|
|
strcmp(name, nft_trans_chain_name(tmp)) == 0) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
|
|
kfree(name);
|
|
goto err_trans;
|
|
}
|
|
}
|
|
|
|
nft_trans_chain_name(trans) = name;
|
|
}
|
|
|
|
nft_trans_basechain(trans) = basechain;
|
|
INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
|
|
list_splice(&hook.list, &nft_trans_chain_hooks(trans));
|
|
if (nla[NFTA_CHAIN_HOOK])
|
|
module_put(hook.type->owner);
|
|
|
|
nft_trans_commit_list_add_tail(ctx->net, trans);
|
|
|
|
return 0;
|
|
|
|
err_trans:
|
|
free_percpu(stats);
|
|
kfree(trans);
|
|
err_hooks:
|
|
if (nla[NFTA_CHAIN_HOOK]) {
|
|
list_for_each_entry_safe(h, next, &hook.list, list) {
|
|
if (unregister)
|
|
nf_unregister_net_hook(ctx->net, &h->ops);
|
|
list_del(&h->list);
|
|
kfree_rcu(h, rcu);
|
|
}
|
|
module_put(hook.type->owner);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
|
|
const struct nft_table *table,
|
|
const struct nlattr *nla, u8 genmask)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(net);
|
|
u32 id = ntohl(nla_get_be32(nla));
|
|
struct nft_trans *trans;
|
|
|
|
list_for_each_entry(trans, &nft_net->commit_list, list) {
|
|
struct nft_chain *chain = trans->ctx.chain;
|
|
|
|
if (trans->msg_type == NFT_MSG_NEWCHAIN &&
|
|
chain->table == table &&
|
|
id == nft_trans_chain_id(trans) &&
|
|
nft_active_genmask(chain, genmask))
|
|
return chain;
|
|
}
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(info->net);
|
|
struct netlink_ext_ack *extack = info->extack;
|
|
u8 genmask = nft_genmask_next(info->net);
|
|
u8 family = info->nfmsg->nfgen_family;
|
|
struct nft_chain *chain = NULL;
|
|
struct net *net = info->net;
|
|
const struct nlattr *attr;
|
|
struct nft_table *table;
|
|
u8 policy = NF_ACCEPT;
|
|
struct nft_ctx ctx;
|
|
u64 handle = 0;
|
|
u32 flags = 0;
|
|
|
|
lockdep_assert_held(&nft_net->commit_mutex);
|
|
|
|
table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
|
|
NETLINK_CB(skb).portid);
|
|
if (IS_ERR(table)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
|
|
return PTR_ERR(table);
|
|
}
|
|
|
|
chain = NULL;
|
|
attr = nla[NFTA_CHAIN_NAME];
|
|
|
|
if (nla[NFTA_CHAIN_HANDLE]) {
|
|
handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
|
|
chain = nft_chain_lookup_byhandle(table, handle, genmask);
|
|
if (IS_ERR(chain)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
|
|
return PTR_ERR(chain);
|
|
}
|
|
attr = nla[NFTA_CHAIN_HANDLE];
|
|
} else if (nla[NFTA_CHAIN_NAME]) {
|
|
chain = nft_chain_lookup(net, table, attr, genmask);
|
|
if (IS_ERR(chain)) {
|
|
if (PTR_ERR(chain) != -ENOENT) {
|
|
NL_SET_BAD_ATTR(extack, attr);
|
|
return PTR_ERR(chain);
|
|
}
|
|
chain = NULL;
|
|
}
|
|
} else if (!nla[NFTA_CHAIN_ID]) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (nla[NFTA_CHAIN_POLICY]) {
|
|
if (chain != NULL &&
|
|
!nft_is_base_chain(chain)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
if (chain == NULL &&
|
|
nla[NFTA_CHAIN_HOOK] == NULL) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
|
|
switch (policy) {
|
|
case NF_DROP:
|
|
case NF_ACCEPT:
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
if (nla[NFTA_CHAIN_FLAGS])
|
|
flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
|
|
else if (chain)
|
|
flags = chain->flags;
|
|
|
|
if (flags & ~NFT_CHAIN_FLAGS)
|
|
return -EOPNOTSUPP;
|
|
|
|
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
|
|
|
|
if (chain != NULL) {
|
|
if (chain->flags & NFT_CHAIN_BINDING)
|
|
return -EINVAL;
|
|
|
|
if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
|
|
NL_SET_BAD_ATTR(extack, attr);
|
|
return -EEXIST;
|
|
}
|
|
if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
|
|
return -EOPNOTSUPP;
|
|
|
|
flags |= chain->flags & NFT_CHAIN_BASE;
|
|
return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
|
|
extack);
|
|
}
|
|
|
|
return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
|
|
}
|
|
|
|
static int nft_delchain_hook(struct nft_ctx *ctx,
|
|
struct nft_base_chain *basechain,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
const struct nft_chain *chain = &basechain->chain;
|
|
const struct nlattr * const *nla = ctx->nla;
|
|
struct nft_chain_hook chain_hook = {};
|
|
struct nft_hook *this, *hook;
|
|
LIST_HEAD(chain_del_list);
|
|
struct nft_trans *trans;
|
|
int err;
|
|
|
|
err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
|
|
ctx->family, chain->flags, extack);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
list_for_each_entry(this, &chain_hook.list, list) {
|
|
hook = nft_hook_list_find(&basechain->hook_list, this);
|
|
if (!hook) {
|
|
err = -ENOENT;
|
|
goto err_chain_del_hook;
|
|
}
|
|
list_move(&hook->list, &chain_del_list);
|
|
}
|
|
|
|
trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
|
|
sizeof(struct nft_trans_chain));
|
|
if (!trans) {
|
|
err = -ENOMEM;
|
|
goto err_chain_del_hook;
|
|
}
|
|
|
|
nft_trans_basechain(trans) = basechain;
|
|
nft_trans_chain_update(trans) = true;
|
|
INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
|
|
list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
|
|
nft_chain_release_hook(&chain_hook);
|
|
|
|
nft_trans_commit_list_add_tail(ctx->net, trans);
|
|
|
|
return 0;
|
|
|
|
err_chain_del_hook:
|
|
list_splice(&chain_del_list, &basechain->hook_list);
|
|
nft_chain_release_hook(&chain_hook);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
struct netlink_ext_ack *extack = info->extack;
|
|
u8 genmask = nft_genmask_next(info->net);
|
|
u8 family = info->nfmsg->nfgen_family;
|
|
struct net *net = info->net;
|
|
const struct nlattr *attr;
|
|
struct nft_table *table;
|
|
struct nft_chain *chain;
|
|
struct nft_rule *rule;
|
|
struct nft_ctx ctx;
|
|
u64 handle;
|
|
u32 use;
|
|
int err;
|
|
|
|
table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
|
|
NETLINK_CB(skb).portid);
|
|
if (IS_ERR(table)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
|
|
return PTR_ERR(table);
|
|
}
|
|
|
|
if (nla[NFTA_CHAIN_HANDLE]) {
|
|
attr = nla[NFTA_CHAIN_HANDLE];
|
|
handle = be64_to_cpu(nla_get_be64(attr));
|
|
chain = nft_chain_lookup_byhandle(table, handle, genmask);
|
|
} else {
|
|
attr = nla[NFTA_CHAIN_NAME];
|
|
chain = nft_chain_lookup(net, table, attr, genmask);
|
|
}
|
|
if (IS_ERR(chain)) {
|
|
if (PTR_ERR(chain) == -ENOENT &&
|
|
NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
|
|
return 0;
|
|
|
|
NL_SET_BAD_ATTR(extack, attr);
|
|
return PTR_ERR(chain);
|
|
}
|
|
|
|
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
|
|
|
|
if (nla[NFTA_CHAIN_HOOK]) {
|
|
if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (nft_is_base_chain(chain)) {
|
|
struct nft_base_chain *basechain = nft_base_chain(chain);
|
|
|
|
if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
|
|
return nft_delchain_hook(&ctx, basechain, extack);
|
|
}
|
|
}
|
|
|
|
if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
|
|
chain->use > 0)
|
|
return -EBUSY;
|
|
|
|
use = chain->use;
|
|
list_for_each_entry(rule, &chain->rules, list) {
|
|
if (!nft_is_active_next(net, rule))
|
|
continue;
|
|
use--;
|
|
|
|
err = nft_delrule(&ctx, rule);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
/* There are rules and elements that are still holding references to us,
|
|
* we cannot do a recursive removal in this case.
|
|
*/
|
|
if (use > 0) {
|
|
NL_SET_BAD_ATTR(extack, attr);
|
|
return -EBUSY;
|
|
}
|
|
|
|
return nft_delchain(&ctx);
|
|
}
|
|
|
|
/*
|
|
* Expressions
|
|
*/
|
|
|
|
/**
|
|
* nft_register_expr - register nf_tables expr type
|
|
* @type: expr type
|
|
*
|
|
* Registers the expr type for use with nf_tables. Returns zero on
|
|
* success or a negative errno code otherwise.
|
|
*/
|
|
int nft_register_expr(struct nft_expr_type *type)
|
|
{
|
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
|
if (type->family == NFPROTO_UNSPEC)
|
|
list_add_tail_rcu(&type->list, &nf_tables_expressions);
|
|
else
|
|
list_add_rcu(&type->list, &nf_tables_expressions);
|
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_register_expr);
|
|
|
|
/**
|
|
* nft_unregister_expr - unregister nf_tables expr type
|
|
* @type: expr type
|
|
*
|
|
* Unregisters the expr typefor use with nf_tables.
|
|
*/
|
|
void nft_unregister_expr(struct nft_expr_type *type)
|
|
{
|
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
|
list_del_rcu(&type->list);
|
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_unregister_expr);
|
|
|
|
static const struct nft_expr_type *__nft_expr_type_get(u8 family,
|
|
struct nlattr *nla)
|
|
{
|
|
const struct nft_expr_type *type, *candidate = NULL;
|
|
|
|
list_for_each_entry(type, &nf_tables_expressions, list) {
|
|
if (!nla_strcmp(nla, type->name)) {
|
|
if (!type->family && !candidate)
|
|
candidate = type;
|
|
else if (type->family == family)
|
|
candidate = type;
|
|
}
|
|
}
|
|
return candidate;
|
|
}
|
|
|
|
#ifdef CONFIG_MODULES
|
|
static int nft_expr_type_request_module(struct net *net, u8 family,
|
|
struct nlattr *nla)
|
|
{
|
|
if (nft_request_module(net, "nft-expr-%u-%.*s", family,
|
|
nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
|
|
return -EAGAIN;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static const struct nft_expr_type *nft_expr_type_get(struct net *net,
|
|
u8 family,
|
|
struct nlattr *nla)
|
|
{
|
|
const struct nft_expr_type *type;
|
|
|
|
if (nla == NULL)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
type = __nft_expr_type_get(family, nla);
|
|
if (type != NULL && try_module_get(type->owner))
|
|
return type;
|
|
|
|
lockdep_nfnl_nft_mutex_not_held();
|
|
#ifdef CONFIG_MODULES
|
|
if (type == NULL) {
|
|
if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
|
|
return ERR_PTR(-EAGAIN);
|
|
|
|
if (nft_request_module(net, "nft-expr-%.*s",
|
|
nla_len(nla),
|
|
(char *)nla_data(nla)) == -EAGAIN)
|
|
return ERR_PTR(-EAGAIN);
|
|
}
|
|
#endif
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
|
|
[NFTA_EXPR_NAME] = { .type = NLA_STRING,
|
|
.len = NFT_MODULE_AUTOLOAD_LIMIT },
|
|
[NFTA_EXPR_DATA] = { .type = NLA_NESTED },
|
|
};
|
|
|
|
static int nf_tables_fill_expr_info(struct sk_buff *skb,
|
|
const struct nft_expr *expr, bool reset)
|
|
{
|
|
if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
|
|
goto nla_put_failure;
|
|
|
|
if (expr->ops->dump) {
|
|
struct nlattr *data = nla_nest_start_noflag(skb,
|
|
NFTA_EXPR_DATA);
|
|
if (data == NULL)
|
|
goto nla_put_failure;
|
|
if (expr->ops->dump(skb, expr, reset) < 0)
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, data);
|
|
}
|
|
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
};
|
|
|
|
int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
|
|
const struct nft_expr *expr, bool reset)
|
|
{
|
|
struct nlattr *nest;
|
|
|
|
nest = nla_nest_start_noflag(skb, attr);
|
|
if (!nest)
|
|
goto nla_put_failure;
|
|
if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
struct nft_expr_info {
|
|
const struct nft_expr_ops *ops;
|
|
const struct nlattr *attr;
|
|
struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
|
|
};
|
|
|
|
static int nf_tables_expr_parse(const struct nft_ctx *ctx,
|
|
const struct nlattr *nla,
|
|
struct nft_expr_info *info)
|
|
{
|
|
const struct nft_expr_type *type;
|
|
const struct nft_expr_ops *ops;
|
|
struct nlattr *tb[NFTA_EXPR_MAX + 1];
|
|
int err;
|
|
|
|
err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
|
|
nft_expr_policy, NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
|
|
if (IS_ERR(type))
|
|
return PTR_ERR(type);
|
|
|
|
if (tb[NFTA_EXPR_DATA]) {
|
|
err = nla_parse_nested_deprecated(info->tb, type->maxattr,
|
|
tb[NFTA_EXPR_DATA],
|
|
type->policy, NULL);
|
|
if (err < 0)
|
|
goto err1;
|
|
} else
|
|
memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
|
|
|
|
if (type->select_ops != NULL) {
|
|
ops = type->select_ops(ctx,
|
|
(const struct nlattr * const *)info->tb);
|
|
if (IS_ERR(ops)) {
|
|
err = PTR_ERR(ops);
|
|
#ifdef CONFIG_MODULES
|
|
if (err == -EAGAIN)
|
|
if (nft_expr_type_request_module(ctx->net,
|
|
ctx->family,
|
|
tb[NFTA_EXPR_NAME]) != -EAGAIN)
|
|
err = -ENOENT;
|
|
#endif
|
|
goto err1;
|
|
}
|
|
} else
|
|
ops = type->ops;
|
|
|
|
info->attr = nla;
|
|
info->ops = ops;
|
|
|
|
return 0;
|
|
|
|
err1:
|
|
module_put(type->owner);
|
|
return err;
|
|
}
|
|
|
|
int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
|
|
struct nft_expr_info *info)
|
|
{
|
|
struct nlattr *tb[NFTA_EXPR_MAX + 1];
|
|
const struct nft_expr_type *type;
|
|
int err;
|
|
|
|
err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
|
|
nft_expr_policy, NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (!tb[NFTA_EXPR_DATA])
|
|
return -EINVAL;
|
|
|
|
type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
|
|
if (!type)
|
|
return -ENOENT;
|
|
|
|
if (!type->inner_ops)
|
|
return -EOPNOTSUPP;
|
|
|
|
err = nla_parse_nested_deprecated(info->tb, type->maxattr,
|
|
tb[NFTA_EXPR_DATA],
|
|
type->policy, NULL);
|
|
if (err < 0)
|
|
goto err_nla_parse;
|
|
|
|
info->attr = nla;
|
|
info->ops = type->inner_ops;
|
|
|
|
return 0;
|
|
|
|
err_nla_parse:
|
|
return err;
|
|
}
|
|
|
|
static int nf_tables_newexpr(const struct nft_ctx *ctx,
|
|
const struct nft_expr_info *expr_info,
|
|
struct nft_expr *expr)
|
|
{
|
|
const struct nft_expr_ops *ops = expr_info->ops;
|
|
int err;
|
|
|
|
expr->ops = ops;
|
|
if (ops->init) {
|
|
err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
|
|
if (err < 0)
|
|
goto err1;
|
|
}
|
|
|
|
return 0;
|
|
err1:
|
|
expr->ops = NULL;
|
|
return err;
|
|
}
|
|
|
|
static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
|
|
struct nft_expr *expr)
|
|
{
|
|
const struct nft_expr_type *type = expr->ops->type;
|
|
|
|
if (expr->ops->destroy)
|
|
expr->ops->destroy(ctx, expr);
|
|
module_put(type->owner);
|
|
}
|
|
|
|
static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
|
|
const struct nlattr *nla)
|
|
{
|
|
struct nft_expr_info expr_info;
|
|
struct nft_expr *expr;
|
|
struct module *owner;
|
|
int err;
|
|
|
|
err = nf_tables_expr_parse(ctx, nla, &expr_info);
|
|
if (err < 0)
|
|
goto err_expr_parse;
|
|
|
|
err = -EOPNOTSUPP;
|
|
if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
|
|
goto err_expr_stateful;
|
|
|
|
err = -ENOMEM;
|
|
expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
|
|
if (expr == NULL)
|
|
goto err_expr_stateful;
|
|
|
|
err = nf_tables_newexpr(ctx, &expr_info, expr);
|
|
if (err < 0)
|
|
goto err_expr_new;
|
|
|
|
return expr;
|
|
err_expr_new:
|
|
kfree(expr);
|
|
err_expr_stateful:
|
|
owner = expr_info.ops->type->owner;
|
|
if (expr_info.ops->type->release_ops)
|
|
expr_info.ops->type->release_ops(expr_info.ops);
|
|
|
|
module_put(owner);
|
|
err_expr_parse:
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
|
|
{
|
|
int err;
|
|
|
|
if (src->ops->clone) {
|
|
dst->ops = src->ops;
|
|
err = src->ops->clone(dst, src);
|
|
if (err < 0)
|
|
return err;
|
|
} else {
|
|
memcpy(dst, src, src->ops->size);
|
|
}
|
|
|
|
__module_get(src->ops->type->owner);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
|
|
{
|
|
nf_tables_expr_destroy(ctx, expr);
|
|
kfree(expr);
|
|
}
|
|
|
|
/*
|
|
* Rules
|
|
*/
|
|
|
|
static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
|
|
u64 handle)
|
|
{
|
|
struct nft_rule *rule;
|
|
|
|
// FIXME: this sucks
|
|
list_for_each_entry_rcu(rule, &chain->rules, list) {
|
|
if (handle == rule->handle)
|
|
return rule;
|
|
}
|
|
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
|
|
const struct nlattr *nla)
|
|
{
|
|
if (nla == NULL)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
|
|
}
|
|
|
|
static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
|
|
[NFTA_RULE_TABLE] = { .type = NLA_STRING,
|
|
.len = NFT_TABLE_MAXNAMELEN - 1 },
|
|
[NFTA_RULE_CHAIN] = { .type = NLA_STRING,
|
|
.len = NFT_CHAIN_MAXNAMELEN - 1 },
|
|
[NFTA_RULE_HANDLE] = { .type = NLA_U64 },
|
|
[NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
|
|
[NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
|
|
[NFTA_RULE_POSITION] = { .type = NLA_U64 },
|
|
[NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
|
|
.len = NFT_USERDATA_MAXLEN },
|
|
[NFTA_RULE_ID] = { .type = NLA_U32 },
|
|
[NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
|
|
[NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
|
|
u32 portid, u32 seq, int event,
|
|
u32 flags, int family,
|
|
const struct nft_table *table,
|
|
const struct nft_chain *chain,
|
|
const struct nft_rule *rule, u64 handle,
|
|
bool reset)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
const struct nft_expr *expr, *next;
|
|
struct nlattr *list;
|
|
u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
|
|
|
|
nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
|
|
nft_base_seq(net));
|
|
if (!nlh)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
|
|
goto nla_put_failure;
|
|
if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
|
|
goto nla_put_failure;
|
|
if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
|
|
NFTA_RULE_PAD))
|
|
goto nla_put_failure;
|
|
|
|
if (event != NFT_MSG_DELRULE && handle) {
|
|
if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
|
|
NFTA_RULE_PAD))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
|
|
nft_flow_rule_stats(chain, rule);
|
|
|
|
list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
|
|
if (list == NULL)
|
|
goto nla_put_failure;
|
|
nft_rule_for_each_expr(expr, next, rule) {
|
|
if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
|
|
goto nla_put_failure;
|
|
}
|
|
nla_nest_end(skb, list);
|
|
|
|
if (rule->udata) {
|
|
struct nft_userdata *udata = nft_userdata(rule);
|
|
if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
|
|
udata->data) < 0)
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, nlh);
|
|
return -1;
|
|
}
|
|
|
|
static void nf_tables_rule_notify(const struct nft_ctx *ctx,
|
|
const struct nft_rule *rule, int event)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(ctx->net);
|
|
const struct nft_rule *prule;
|
|
struct sk_buff *skb;
|
|
u64 handle = 0;
|
|
u16 flags = 0;
|
|
int err;
|
|
|
|
if (!ctx->report &&
|
|
!nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
|
|
return;
|
|
|
|
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (skb == NULL)
|
|
goto err;
|
|
|
|
if (event == NFT_MSG_NEWRULE &&
|
|
!list_is_first(&rule->list, &ctx->chain->rules) &&
|
|
!list_is_last(&rule->list, &ctx->chain->rules)) {
|
|
prule = list_prev_entry(rule, list);
|
|
handle = prule->handle;
|
|
}
|
|
if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
|
|
flags |= NLM_F_APPEND;
|
|
if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
|
|
flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
|
|
|
|
err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
|
|
event, flags, ctx->family, ctx->table,
|
|
ctx->chain, rule, handle, false);
|
|
if (err < 0) {
|
|
kfree_skb(skb);
|
|
goto err;
|
|
}
|
|
|
|
nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
|
|
return;
|
|
err:
|
|
nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
|
|
}
|
|
|
|
struct nft_rule_dump_ctx {
|
|
char *table;
|
|
char *chain;
|
|
};
|
|
|
|
static int __nf_tables_dump_rules(struct sk_buff *skb,
|
|
unsigned int *idx,
|
|
struct netlink_callback *cb,
|
|
const struct nft_table *table,
|
|
const struct nft_chain *chain,
|
|
bool reset)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
const struct nft_rule *rule, *prule;
|
|
unsigned int s_idx = cb->args[0];
|
|
u64 handle;
|
|
|
|
prule = NULL;
|
|
list_for_each_entry_rcu(rule, &chain->rules, list) {
|
|
if (!nft_is_active(net, rule))
|
|
goto cont_skip;
|
|
if (*idx < s_idx)
|
|
goto cont;
|
|
if (*idx > s_idx) {
|
|
memset(&cb->args[1], 0,
|
|
sizeof(cb->args) - sizeof(cb->args[0]));
|
|
}
|
|
if (prule)
|
|
handle = prule->handle;
|
|
else
|
|
handle = 0;
|
|
|
|
if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq,
|
|
NFT_MSG_NEWRULE,
|
|
NLM_F_MULTI | NLM_F_APPEND,
|
|
table->family,
|
|
table, chain, rule, handle, reset) < 0)
|
|
return 1;
|
|
|
|
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
|
|
cont:
|
|
prule = rule;
|
|
cont_skip:
|
|
(*idx)++;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int nf_tables_dump_rules(struct sk_buff *skb,
|
|
struct netlink_callback *cb)
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
|
|
const struct nft_rule_dump_ctx *ctx = cb->data;
|
|
struct nft_table *table;
|
|
const struct nft_chain *chain;
|
|
unsigned int idx = 0;
|
|
struct net *net = sock_net(skb->sk);
|
|
int family = nfmsg->nfgen_family;
|
|
struct nftables_pernet *nft_net;
|
|
bool reset = false;
|
|
|
|
if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
|
|
reset = true;
|
|
|
|
rcu_read_lock();
|
|
nft_net = nft_pernet(net);
|
|
cb->seq = READ_ONCE(nft_net->base_seq);
|
|
|
|
list_for_each_entry_rcu(table, &nft_net->tables, list) {
|
|
if (family != NFPROTO_UNSPEC && family != table->family)
|
|
continue;
|
|
|
|
if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
|
|
continue;
|
|
|
|
if (ctx && ctx->table && ctx->chain) {
|
|
struct rhlist_head *list, *tmp;
|
|
|
|
list = rhltable_lookup(&table->chains_ht, ctx->chain,
|
|
nft_chain_ht_params);
|
|
if (!list)
|
|
goto done;
|
|
|
|
rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
|
|
if (!nft_is_active(net, chain))
|
|
continue;
|
|
__nf_tables_dump_rules(skb, &idx,
|
|
cb, table, chain, reset);
|
|
break;
|
|
}
|
|
goto done;
|
|
}
|
|
|
|
list_for_each_entry_rcu(chain, &table->chains, list) {
|
|
if (__nf_tables_dump_rules(skb, &idx,
|
|
cb, table, chain, reset))
|
|
goto done;
|
|
}
|
|
|
|
if (ctx && ctx->table)
|
|
break;
|
|
}
|
|
done:
|
|
rcu_read_unlock();
|
|
|
|
cb->args[0] = idx;
|
|
return skb->len;
|
|
}
|
|
|
|
static int nf_tables_dump_rules_start(struct netlink_callback *cb)
|
|
{
|
|
const struct nlattr * const *nla = cb->data;
|
|
struct nft_rule_dump_ctx *ctx = NULL;
|
|
|
|
if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
|
|
ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
|
|
if (!ctx)
|
|
return -ENOMEM;
|
|
|
|
if (nla[NFTA_RULE_TABLE]) {
|
|
ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
|
|
GFP_ATOMIC);
|
|
if (!ctx->table) {
|
|
kfree(ctx);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
if (nla[NFTA_RULE_CHAIN]) {
|
|
ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
|
|
GFP_ATOMIC);
|
|
if (!ctx->chain) {
|
|
kfree(ctx->table);
|
|
kfree(ctx);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
}
|
|
|
|
cb->data = ctx;
|
|
return 0;
|
|
}
|
|
|
|
static int nf_tables_dump_rules_done(struct netlink_callback *cb)
|
|
{
|
|
struct nft_rule_dump_ctx *ctx = cb->data;
|
|
|
|
if (ctx) {
|
|
kfree(ctx->table);
|
|
kfree(ctx->chain);
|
|
kfree(ctx);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* called with rcu_read_lock held */
|
|
static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
struct netlink_ext_ack *extack = info->extack;
|
|
u8 genmask = nft_genmask_cur(info->net);
|
|
u8 family = info->nfmsg->nfgen_family;
|
|
const struct nft_chain *chain;
|
|
const struct nft_rule *rule;
|
|
struct net *net = info->net;
|
|
struct nft_table *table;
|
|
struct sk_buff *skb2;
|
|
bool reset = false;
|
|
int err;
|
|
|
|
if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
struct netlink_dump_control c = {
|
|
.start= nf_tables_dump_rules_start,
|
|
.dump = nf_tables_dump_rules,
|
|
.done = nf_tables_dump_rules_done,
|
|
.module = THIS_MODULE,
|
|
.data = (void *)nla,
|
|
};
|
|
|
|
return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
|
|
}
|
|
|
|
table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
|
|
if (IS_ERR(table)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
|
|
return PTR_ERR(table);
|
|
}
|
|
|
|
chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
|
|
if (IS_ERR(chain)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
|
|
return PTR_ERR(chain);
|
|
}
|
|
|
|
rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
|
|
if (IS_ERR(rule)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
|
|
return PTR_ERR(rule);
|
|
}
|
|
|
|
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
|
|
if (!skb2)
|
|
return -ENOMEM;
|
|
|
|
if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
|
|
reset = true;
|
|
|
|
err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
|
|
info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
|
|
family, table, chain, rule, 0, reset);
|
|
if (err < 0)
|
|
goto err_fill_rule_info;
|
|
|
|
return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
|
|
|
|
err_fill_rule_info:
|
|
kfree_skb(skb2);
|
|
return err;
|
|
}
|
|
|
|
void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
|
|
{
|
|
struct nft_expr *expr, *next;
|
|
|
|
/*
|
|
* Careful: some expressions might not be initialized in case this
|
|
* is called on error from nf_tables_newrule().
|
|
*/
|
|
expr = nft_expr_first(rule);
|
|
while (nft_expr_more(rule, expr)) {
|
|
next = nft_expr_next(expr);
|
|
nf_tables_expr_destroy(ctx, expr);
|
|
expr = next;
|
|
}
|
|
kfree(rule);
|
|
}
|
|
|
|
static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
|
|
{
|
|
nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
|
|
nf_tables_rule_destroy(ctx, rule);
|
|
}
|
|
|
|
int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
|
|
{
|
|
struct nft_expr *expr, *last;
|
|
const struct nft_data *data;
|
|
struct nft_rule *rule;
|
|
int err;
|
|
|
|
if (ctx->level == NFT_JUMP_STACK_SIZE)
|
|
return -EMLINK;
|
|
|
|
list_for_each_entry(rule, &chain->rules, list) {
|
|
if (!nft_is_active_next(ctx->net, rule))
|
|
continue;
|
|
|
|
nft_rule_for_each_expr(expr, last, rule) {
|
|
if (!expr->ops->validate)
|
|
continue;
|
|
|
|
err = expr->ops->validate(ctx, expr, &data);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_chain_validate);
|
|
|
|
static int nft_table_validate(struct net *net, const struct nft_table *table)
|
|
{
|
|
struct nft_chain *chain;
|
|
struct nft_ctx ctx = {
|
|
.net = net,
|
|
.family = table->family,
|
|
};
|
|
int err;
|
|
|
|
list_for_each_entry(chain, &table->chains, list) {
|
|
if (!nft_is_base_chain(chain))
|
|
continue;
|
|
|
|
ctx.chain = chain;
|
|
err = nft_chain_validate(&ctx, chain);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
cond_resched();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
|
|
const struct nft_set_iter *iter,
|
|
struct nft_set_elem *elem)
|
|
{
|
|
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
|
|
struct nft_ctx *pctx = (struct nft_ctx *)ctx;
|
|
const struct nft_data *data;
|
|
int err;
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
|
|
*nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
|
|
return 0;
|
|
|
|
data = nft_set_ext_data(ext);
|
|
switch (data->verdict.code) {
|
|
case NFT_JUMP:
|
|
case NFT_GOTO:
|
|
pctx->level++;
|
|
err = nft_chain_validate(ctx, data->verdict.chain);
|
|
if (err < 0)
|
|
return err;
|
|
pctx->level--;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
|
|
{
|
|
u8 genmask = nft_genmask_next(ctx->net);
|
|
struct nft_set_elem_catchall *catchall;
|
|
struct nft_set_elem elem;
|
|
struct nft_set_ext *ext;
|
|
int ret = 0;
|
|
|
|
list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
|
|
ext = nft_set_elem_ext(set, catchall->elem);
|
|
if (!nft_set_elem_active(ext, genmask))
|
|
continue;
|
|
|
|
elem.priv = catchall->elem;
|
|
ret = nft_setelem_validate(ctx, set, NULL, &elem);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
|
|
const struct nft_chain *chain,
|
|
const struct nlattr *nla);
|
|
|
|
#define NFT_RULE_MAXEXPRS 128
|
|
|
|
static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(info->net);
|
|
struct netlink_ext_ack *extack = info->extack;
|
|
unsigned int size, i, n, ulen = 0, usize = 0;
|
|
u8 genmask = nft_genmask_next(info->net);
|
|
struct nft_rule *rule, *old_rule = NULL;
|
|
struct nft_expr_info *expr_info = NULL;
|
|
u8 family = info->nfmsg->nfgen_family;
|
|
struct nft_flow_rule *flow = NULL;
|
|
struct net *net = info->net;
|
|
struct nft_userdata *udata;
|
|
struct nft_table *table;
|
|
struct nft_chain *chain;
|
|
struct nft_trans *trans;
|
|
u64 handle, pos_handle;
|
|
struct nft_expr *expr;
|
|
struct nft_ctx ctx;
|
|
struct nlattr *tmp;
|
|
int err, rem;
|
|
|
|
lockdep_assert_held(&nft_net->commit_mutex);
|
|
|
|
table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
|
|
NETLINK_CB(skb).portid);
|
|
if (IS_ERR(table)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
|
|
return PTR_ERR(table);
|
|
}
|
|
|
|
if (nla[NFTA_RULE_CHAIN]) {
|
|
chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
|
|
genmask);
|
|
if (IS_ERR(chain)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
|
|
return PTR_ERR(chain);
|
|
}
|
|
|
|
} else if (nla[NFTA_RULE_CHAIN_ID]) {
|
|
chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
|
|
genmask);
|
|
if (IS_ERR(chain)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
|
|
return PTR_ERR(chain);
|
|
}
|
|
} else {
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (nft_chain_is_bound(chain))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (nla[NFTA_RULE_HANDLE]) {
|
|
handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
|
|
rule = __nft_rule_lookup(chain, handle);
|
|
if (IS_ERR(rule)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
|
|
return PTR_ERR(rule);
|
|
}
|
|
|
|
if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
|
|
return -EEXIST;
|
|
}
|
|
if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
|
|
old_rule = rule;
|
|
else
|
|
return -EOPNOTSUPP;
|
|
} else {
|
|
if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
|
|
info->nlh->nlmsg_flags & NLM_F_REPLACE)
|
|
return -EINVAL;
|
|
handle = nf_tables_alloc_handle(table);
|
|
|
|
if (nla[NFTA_RULE_POSITION]) {
|
|
pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
|
|
old_rule = __nft_rule_lookup(chain, pos_handle);
|
|
if (IS_ERR(old_rule)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
|
|
return PTR_ERR(old_rule);
|
|
}
|
|
} else if (nla[NFTA_RULE_POSITION_ID]) {
|
|
old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
|
|
if (IS_ERR(old_rule)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
|
|
return PTR_ERR(old_rule);
|
|
}
|
|
}
|
|
}
|
|
|
|
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
|
|
|
|
n = 0;
|
|
size = 0;
|
|
if (nla[NFTA_RULE_EXPRESSIONS]) {
|
|
expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
|
|
sizeof(struct nft_expr_info),
|
|
GFP_KERNEL);
|
|
if (!expr_info)
|
|
return -ENOMEM;
|
|
|
|
nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
|
|
err = -EINVAL;
|
|
if (nla_type(tmp) != NFTA_LIST_ELEM)
|
|
goto err_release_expr;
|
|
if (n == NFT_RULE_MAXEXPRS)
|
|
goto err_release_expr;
|
|
err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
|
|
if (err < 0) {
|
|
NL_SET_BAD_ATTR(extack, tmp);
|
|
goto err_release_expr;
|
|
}
|
|
size += expr_info[n].ops->size;
|
|
n++;
|
|
}
|
|
}
|
|
/* Check for overflow of dlen field */
|
|
err = -EFBIG;
|
|
if (size >= 1 << 12)
|
|
goto err_release_expr;
|
|
|
|
if (nla[NFTA_RULE_USERDATA]) {
|
|
ulen = nla_len(nla[NFTA_RULE_USERDATA]);
|
|
if (ulen > 0)
|
|
usize = sizeof(struct nft_userdata) + ulen;
|
|
}
|
|
|
|
err = -ENOMEM;
|
|
rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
|
|
if (rule == NULL)
|
|
goto err_release_expr;
|
|
|
|
nft_activate_next(net, rule);
|
|
|
|
rule->handle = handle;
|
|
rule->dlen = size;
|
|
rule->udata = ulen ? 1 : 0;
|
|
|
|
if (ulen) {
|
|
udata = nft_userdata(rule);
|
|
udata->len = ulen - 1;
|
|
nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
|
|
}
|
|
|
|
expr = nft_expr_first(rule);
|
|
for (i = 0; i < n; i++) {
|
|
err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
|
|
if (err < 0) {
|
|
NL_SET_BAD_ATTR(extack, expr_info[i].attr);
|
|
goto err_release_rule;
|
|
}
|
|
|
|
if (expr_info[i].ops->validate)
|
|
nft_validate_state_update(table, NFT_VALIDATE_NEED);
|
|
|
|
expr_info[i].ops = NULL;
|
|
expr = nft_expr_next(expr);
|
|
}
|
|
|
|
if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
|
|
flow = nft_flow_rule_create(net, rule);
|
|
if (IS_ERR(flow)) {
|
|
err = PTR_ERR(flow);
|
|
goto err_release_rule;
|
|
}
|
|
}
|
|
|
|
if (!nft_use_inc(&chain->use)) {
|
|
err = -EMFILE;
|
|
goto err_release_rule;
|
|
}
|
|
|
|
if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
|
|
err = nft_delrule(&ctx, old_rule);
|
|
if (err < 0)
|
|
goto err_destroy_flow_rule;
|
|
|
|
trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
|
|
if (trans == NULL) {
|
|
err = -ENOMEM;
|
|
goto err_destroy_flow_rule;
|
|
}
|
|
list_add_tail_rcu(&rule->list, &old_rule->list);
|
|
} else {
|
|
trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
|
|
if (!trans) {
|
|
err = -ENOMEM;
|
|
goto err_destroy_flow_rule;
|
|
}
|
|
|
|
if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
|
|
if (old_rule)
|
|
list_add_rcu(&rule->list, &old_rule->list);
|
|
else
|
|
list_add_tail_rcu(&rule->list, &chain->rules);
|
|
} else {
|
|
if (old_rule)
|
|
list_add_tail_rcu(&rule->list, &old_rule->list);
|
|
else
|
|
list_add_rcu(&rule->list, &chain->rules);
|
|
}
|
|
}
|
|
kvfree(expr_info);
|
|
|
|
if (flow)
|
|
nft_trans_flow_rule(trans) = flow;
|
|
|
|
if (table->validate_state == NFT_VALIDATE_DO)
|
|
return nft_table_validate(net, table);
|
|
|
|
return 0;
|
|
|
|
err_destroy_flow_rule:
|
|
nft_use_dec_restore(&chain->use);
|
|
if (flow)
|
|
nft_flow_rule_destroy(flow);
|
|
err_release_rule:
|
|
nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
|
|
nf_tables_rule_destroy(&ctx, rule);
|
|
err_release_expr:
|
|
for (i = 0; i < n; i++) {
|
|
if (expr_info[i].ops) {
|
|
module_put(expr_info[i].ops->type->owner);
|
|
if (expr_info[i].ops->type->release_ops)
|
|
expr_info[i].ops->type->release_ops(expr_info[i].ops);
|
|
}
|
|
}
|
|
kvfree(expr_info);
|
|
|
|
return err;
|
|
}
|
|
|
|
static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
|
|
const struct nft_chain *chain,
|
|
const struct nlattr *nla)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(net);
|
|
u32 id = ntohl(nla_get_be32(nla));
|
|
struct nft_trans *trans;
|
|
|
|
list_for_each_entry(trans, &nft_net->commit_list, list) {
|
|
if (trans->msg_type == NFT_MSG_NEWRULE &&
|
|
trans->ctx.chain == chain &&
|
|
id == nft_trans_rule_id(trans))
|
|
return nft_trans_rule(trans);
|
|
}
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
struct netlink_ext_ack *extack = info->extack;
|
|
u8 genmask = nft_genmask_next(info->net);
|
|
u8 family = info->nfmsg->nfgen_family;
|
|
struct nft_chain *chain = NULL;
|
|
struct net *net = info->net;
|
|
struct nft_table *table;
|
|
struct nft_rule *rule;
|
|
struct nft_ctx ctx;
|
|
int err = 0;
|
|
|
|
table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
|
|
NETLINK_CB(skb).portid);
|
|
if (IS_ERR(table)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
|
|
return PTR_ERR(table);
|
|
}
|
|
|
|
if (nla[NFTA_RULE_CHAIN]) {
|
|
chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
|
|
genmask);
|
|
if (IS_ERR(chain)) {
|
|
if (PTR_ERR(chain) == -ENOENT &&
|
|
NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
|
|
return 0;
|
|
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
|
|
return PTR_ERR(chain);
|
|
}
|
|
if (nft_chain_is_bound(chain))
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
|
|
|
|
if (chain) {
|
|
if (nla[NFTA_RULE_HANDLE]) {
|
|
rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
|
|
if (IS_ERR(rule)) {
|
|
if (PTR_ERR(rule) == -ENOENT &&
|
|
NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
|
|
return 0;
|
|
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
|
|
return PTR_ERR(rule);
|
|
}
|
|
|
|
err = nft_delrule(&ctx, rule);
|
|
} else if (nla[NFTA_RULE_ID]) {
|
|
rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
|
|
if (IS_ERR(rule)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
|
|
return PTR_ERR(rule);
|
|
}
|
|
|
|
err = nft_delrule(&ctx, rule);
|
|
} else {
|
|
err = nft_delrule_by_chain(&ctx);
|
|
}
|
|
} else {
|
|
list_for_each_entry(chain, &table->chains, list) {
|
|
if (!nft_is_active_next(net, chain))
|
|
continue;
|
|
if (nft_chain_is_bound(chain))
|
|
continue;
|
|
|
|
ctx.chain = chain;
|
|
err = nft_delrule_by_chain(&ctx);
|
|
if (err < 0)
|
|
break;
|
|
}
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Sets
|
|
*/
|
|
static const struct nft_set_type *nft_set_types[] = {
|
|
&nft_set_hash_fast_type,
|
|
&nft_set_hash_type,
|
|
&nft_set_rhash_type,
|
|
&nft_set_bitmap_type,
|
|
&nft_set_rbtree_type,
|
|
#if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
|
|
&nft_set_pipapo_avx2_type,
|
|
#endif
|
|
&nft_set_pipapo_type,
|
|
};
|
|
|
|
#define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
|
|
NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
|
|
NFT_SET_EVAL)
|
|
|
|
static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
|
|
{
|
|
return (flags & type->features) == (flags & NFT_SET_FEATURES);
|
|
}
|
|
|
|
/*
|
|
* Select a set implementation based on the data characteristics and the
|
|
* given policy. The total memory use might not be known if no size is
|
|
* given, in that case the amount of memory per element is used.
|
|
*/
|
|
static const struct nft_set_ops *
|
|
nft_select_set_ops(const struct nft_ctx *ctx,
|
|
const struct nlattr * const nla[],
|
|
const struct nft_set_desc *desc)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(ctx->net);
|
|
const struct nft_set_ops *ops, *bops;
|
|
struct nft_set_estimate est, best;
|
|
const struct nft_set_type *type;
|
|
u32 flags = 0;
|
|
int i;
|
|
|
|
lockdep_assert_held(&nft_net->commit_mutex);
|
|
lockdep_nfnl_nft_mutex_not_held();
|
|
|
|
if (nla[NFTA_SET_FLAGS] != NULL)
|
|
flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
|
|
|
|
bops = NULL;
|
|
best.size = ~0;
|
|
best.lookup = ~0;
|
|
best.space = ~0;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
|
|
type = nft_set_types[i];
|
|
ops = &type->ops;
|
|
|
|
if (!nft_set_ops_candidate(type, flags))
|
|
continue;
|
|
if (!ops->estimate(desc, flags, &est))
|
|
continue;
|
|
|
|
switch (desc->policy) {
|
|
case NFT_SET_POL_PERFORMANCE:
|
|
if (est.lookup < best.lookup)
|
|
break;
|
|
if (est.lookup == best.lookup &&
|
|
est.space < best.space)
|
|
break;
|
|
continue;
|
|
case NFT_SET_POL_MEMORY:
|
|
if (!desc->size) {
|
|
if (est.space < best.space)
|
|
break;
|
|
if (est.space == best.space &&
|
|
est.lookup < best.lookup)
|
|
break;
|
|
} else if (est.size < best.size || !bops) {
|
|
break;
|
|
}
|
|
continue;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
bops = ops;
|
|
best = est;
|
|
}
|
|
|
|
if (bops != NULL)
|
|
return bops;
|
|
|
|
return ERR_PTR(-EOPNOTSUPP);
|
|
}
|
|
|
|
static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
|
|
[NFTA_SET_TABLE] = { .type = NLA_STRING,
|
|
.len = NFT_TABLE_MAXNAMELEN - 1 },
|
|
[NFTA_SET_NAME] = { .type = NLA_STRING,
|
|
.len = NFT_SET_MAXNAMELEN - 1 },
|
|
[NFTA_SET_FLAGS] = { .type = NLA_U32 },
|
|
[NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
|
|
[NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
|
|
[NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
|
|
[NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
|
|
[NFTA_SET_POLICY] = { .type = NLA_U32 },
|
|
[NFTA_SET_DESC] = { .type = NLA_NESTED },
|
|
[NFTA_SET_ID] = { .type = NLA_U32 },
|
|
[NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
|
|
[NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
|
|
[NFTA_SET_USERDATA] = { .type = NLA_BINARY,
|
|
.len = NFT_USERDATA_MAXLEN },
|
|
[NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
|
|
[NFTA_SET_HANDLE] = { .type = NLA_U64 },
|
|
[NFTA_SET_EXPR] = { .type = NLA_NESTED },
|
|
[NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
|
|
};
|
|
|
|
static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
|
|
[NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
|
|
[NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
|
|
};
|
|
|
|
static struct nft_set *nft_set_lookup(const struct nft_table *table,
|
|
const struct nlattr *nla, u8 genmask)
|
|
{
|
|
struct nft_set *set;
|
|
|
|
if (nla == NULL)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
list_for_each_entry_rcu(set, &table->sets, list) {
|
|
if (!nla_strcmp(nla, set->name) &&
|
|
nft_active_genmask(set, genmask))
|
|
return set;
|
|
}
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
|
|
const struct nlattr *nla,
|
|
u8 genmask)
|
|
{
|
|
struct nft_set *set;
|
|
|
|
list_for_each_entry(set, &table->sets, list) {
|
|
if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
|
|
nft_active_genmask(set, genmask))
|
|
return set;
|
|
}
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
static struct nft_set *nft_set_lookup_byid(const struct net *net,
|
|
const struct nft_table *table,
|
|
const struct nlattr *nla, u8 genmask)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(net);
|
|
u32 id = ntohl(nla_get_be32(nla));
|
|
struct nft_trans *trans;
|
|
|
|
list_for_each_entry(trans, &nft_net->commit_list, list) {
|
|
if (trans->msg_type == NFT_MSG_NEWSET) {
|
|
struct nft_set *set = nft_trans_set(trans);
|
|
|
|
if (id == nft_trans_set_id(trans) &&
|
|
set->table == table &&
|
|
nft_active_genmask(set, genmask))
|
|
return set;
|
|
}
|
|
}
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
struct nft_set *nft_set_lookup_global(const struct net *net,
|
|
const struct nft_table *table,
|
|
const struct nlattr *nla_set_name,
|
|
const struct nlattr *nla_set_id,
|
|
u8 genmask)
|
|
{
|
|
struct nft_set *set;
|
|
|
|
set = nft_set_lookup(table, nla_set_name, genmask);
|
|
if (IS_ERR(set)) {
|
|
if (!nla_set_id)
|
|
return set;
|
|
|
|
set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
|
|
}
|
|
return set;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_set_lookup_global);
|
|
|
|
static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
|
|
const char *name)
|
|
{
|
|
const struct nft_set *i;
|
|
const char *p;
|
|
unsigned long *inuse;
|
|
unsigned int n = 0, min = 0;
|
|
|
|
p = strchr(name, '%');
|
|
if (p != NULL) {
|
|
if (p[1] != 'd' || strchr(p + 2, '%'))
|
|
return -EINVAL;
|
|
|
|
inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
|
|
if (inuse == NULL)
|
|
return -ENOMEM;
|
|
cont:
|
|
list_for_each_entry(i, &ctx->table->sets, list) {
|
|
int tmp;
|
|
|
|
if (!nft_is_active_next(ctx->net, i))
|
|
continue;
|
|
if (!sscanf(i->name, name, &tmp))
|
|
continue;
|
|
if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
|
|
continue;
|
|
|
|
set_bit(tmp - min, inuse);
|
|
}
|
|
|
|
n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
|
|
if (n >= BITS_PER_BYTE * PAGE_SIZE) {
|
|
min += BITS_PER_BYTE * PAGE_SIZE;
|
|
memset(inuse, 0, PAGE_SIZE);
|
|
goto cont;
|
|
}
|
|
free_page((unsigned long)inuse);
|
|
}
|
|
|
|
set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
|
|
if (!set->name)
|
|
return -ENOMEM;
|
|
|
|
list_for_each_entry(i, &ctx->table->sets, list) {
|
|
if (!nft_is_active_next(ctx->net, i))
|
|
continue;
|
|
if (!strcmp(set->name, i->name)) {
|
|
kfree(set->name);
|
|
set->name = NULL;
|
|
return -ENFILE;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
|
|
{
|
|
u64 ms = be64_to_cpu(nla_get_be64(nla));
|
|
u64 max = (u64)(~((u64)0));
|
|
|
|
max = div_u64(max, NSEC_PER_MSEC);
|
|
if (ms >= max)
|
|
return -ERANGE;
|
|
|
|
ms *= NSEC_PER_MSEC;
|
|
*result = nsecs_to_jiffies64(ms);
|
|
return 0;
|
|
}
|
|
|
|
__be64 nf_jiffies64_to_msecs(u64 input)
|
|
{
|
|
return cpu_to_be64(jiffies64_to_msecs(input));
|
|
}
|
|
|
|
static int nf_tables_fill_set_concat(struct sk_buff *skb,
|
|
const struct nft_set *set)
|
|
{
|
|
struct nlattr *concat, *field;
|
|
int i;
|
|
|
|
concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
|
|
if (!concat)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < set->field_count; i++) {
|
|
field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
|
|
if (!field)
|
|
return -ENOMEM;
|
|
|
|
if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
|
|
htonl(set->field_len[i])))
|
|
return -ENOMEM;
|
|
|
|
nla_nest_end(skb, field);
|
|
}
|
|
|
|
nla_nest_end(skb, concat);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
|
|
const struct nft_set *set, u16 event, u16 flags)
|
|
{
|
|
u64 timeout = READ_ONCE(set->timeout);
|
|
u32 gc_int = READ_ONCE(set->gc_int);
|
|
u32 portid = ctx->portid;
|
|
struct nlmsghdr *nlh;
|
|
struct nlattr *nest;
|
|
u32 seq = ctx->seq;
|
|
int i;
|
|
|
|
event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
|
|
nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
|
|
NFNETLINK_V0, nft_base_seq(ctx->net));
|
|
if (!nlh)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
|
|
goto nla_put_failure;
|
|
if (nla_put_string(skb, NFTA_SET_NAME, set->name))
|
|
goto nla_put_failure;
|
|
if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
|
|
NFTA_SET_PAD))
|
|
goto nla_put_failure;
|
|
|
|
if (event == NFT_MSG_DELSET) {
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
}
|
|
|
|
if (set->flags != 0)
|
|
if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
|
|
goto nla_put_failure;
|
|
if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
|
|
goto nla_put_failure;
|
|
if (set->flags & NFT_SET_MAP) {
|
|
if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
|
|
goto nla_put_failure;
|
|
if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
|
|
goto nla_put_failure;
|
|
}
|
|
if (set->flags & NFT_SET_OBJECT &&
|
|
nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
|
|
goto nla_put_failure;
|
|
|
|
if (timeout &&
|
|
nla_put_be64(skb, NFTA_SET_TIMEOUT,
|
|
nf_jiffies64_to_msecs(timeout),
|
|
NFTA_SET_PAD))
|
|
goto nla_put_failure;
|
|
if (gc_int &&
|
|
nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
|
|
goto nla_put_failure;
|
|
|
|
if (set->policy != NFT_SET_POL_PERFORMANCE) {
|
|
if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
if (set->udata &&
|
|
nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
|
|
goto nla_put_failure;
|
|
|
|
nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
|
|
if (!nest)
|
|
goto nla_put_failure;
|
|
if (set->size &&
|
|
nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
|
|
goto nla_put_failure;
|
|
|
|
if (set->field_count > 1 &&
|
|
nf_tables_fill_set_concat(skb, set))
|
|
goto nla_put_failure;
|
|
|
|
nla_nest_end(skb, nest);
|
|
|
|
if (set->num_exprs == 1) {
|
|
nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
|
|
if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
|
|
goto nla_put_failure;
|
|
|
|
nla_nest_end(skb, nest);
|
|
} else if (set->num_exprs > 1) {
|
|
nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
|
|
for (i = 0; i < set->num_exprs; i++) {
|
|
if (nft_expr_dump(skb, NFTA_LIST_ELEM,
|
|
set->exprs[i], false) < 0)
|
|
goto nla_put_failure;
|
|
}
|
|
nla_nest_end(skb, nest);
|
|
}
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, nlh);
|
|
return -1;
|
|
}
|
|
|
|
static void nf_tables_set_notify(const struct nft_ctx *ctx,
|
|
const struct nft_set *set, int event,
|
|
gfp_t gfp_flags)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(ctx->net);
|
|
u32 portid = ctx->portid;
|
|
struct sk_buff *skb;
|
|
u16 flags = 0;
|
|
int err;
|
|
|
|
if (!ctx->report &&
|
|
!nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
|
|
return;
|
|
|
|
skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
|
|
if (skb == NULL)
|
|
goto err;
|
|
|
|
if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
|
|
flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
|
|
|
|
err = nf_tables_fill_set(skb, ctx, set, event, flags);
|
|
if (err < 0) {
|
|
kfree_skb(skb);
|
|
goto err;
|
|
}
|
|
|
|
nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
|
|
return;
|
|
err:
|
|
nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
|
|
}
|
|
|
|
static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
const struct nft_set *set;
|
|
unsigned int idx, s_idx = cb->args[0];
|
|
struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
|
|
struct net *net = sock_net(skb->sk);
|
|
struct nft_ctx *ctx = cb->data, ctx_set;
|
|
struct nftables_pernet *nft_net;
|
|
|
|
if (cb->args[1])
|
|
return skb->len;
|
|
|
|
rcu_read_lock();
|
|
nft_net = nft_pernet(net);
|
|
cb->seq = READ_ONCE(nft_net->base_seq);
|
|
|
|
list_for_each_entry_rcu(table, &nft_net->tables, list) {
|
|
if (ctx->family != NFPROTO_UNSPEC &&
|
|
ctx->family != table->family)
|
|
continue;
|
|
|
|
if (ctx->table && ctx->table != table)
|
|
continue;
|
|
|
|
if (cur_table) {
|
|
if (cur_table != table)
|
|
continue;
|
|
|
|
cur_table = NULL;
|
|
}
|
|
idx = 0;
|
|
list_for_each_entry_rcu(set, &table->sets, list) {
|
|
if (idx < s_idx)
|
|
goto cont;
|
|
if (!nft_is_active(net, set))
|
|
goto cont;
|
|
|
|
ctx_set = *ctx;
|
|
ctx_set.table = table;
|
|
ctx_set.family = table->family;
|
|
|
|
if (nf_tables_fill_set(skb, &ctx_set, set,
|
|
NFT_MSG_NEWSET,
|
|
NLM_F_MULTI) < 0) {
|
|
cb->args[0] = idx;
|
|
cb->args[2] = (unsigned long) table;
|
|
goto done;
|
|
}
|
|
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
|
|
cont:
|
|
idx++;
|
|
}
|
|
if (s_idx)
|
|
s_idx = 0;
|
|
}
|
|
cb->args[1] = 1;
|
|
done:
|
|
rcu_read_unlock();
|
|
return skb->len;
|
|
}
|
|
|
|
static int nf_tables_dump_sets_start(struct netlink_callback *cb)
|
|
{
|
|
struct nft_ctx *ctx_dump = NULL;
|
|
|
|
ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
|
|
if (ctx_dump == NULL)
|
|
return -ENOMEM;
|
|
|
|
cb->data = ctx_dump;
|
|
return 0;
|
|
}
|
|
|
|
static int nf_tables_dump_sets_done(struct netlink_callback *cb)
|
|
{
|
|
kfree(cb->data);
|
|
return 0;
|
|
}
|
|
|
|
/* called with rcu_read_lock held */
|
|
static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
struct netlink_ext_ack *extack = info->extack;
|
|
u8 genmask = nft_genmask_cur(info->net);
|
|
u8 family = info->nfmsg->nfgen_family;
|
|
struct nft_table *table = NULL;
|
|
struct net *net = info->net;
|
|
const struct nft_set *set;
|
|
struct sk_buff *skb2;
|
|
struct nft_ctx ctx;
|
|
int err;
|
|
|
|
if (nla[NFTA_SET_TABLE]) {
|
|
table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
|
|
genmask, 0);
|
|
if (IS_ERR(table)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
|
|
return PTR_ERR(table);
|
|
}
|
|
}
|
|
|
|
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
|
|
|
|
if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
struct netlink_dump_control c = {
|
|
.start = nf_tables_dump_sets_start,
|
|
.dump = nf_tables_dump_sets,
|
|
.done = nf_tables_dump_sets_done,
|
|
.data = &ctx,
|
|
.module = THIS_MODULE,
|
|
};
|
|
|
|
return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
|
|
}
|
|
|
|
/* Only accept unspec with dump */
|
|
if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
|
|
return -EAFNOSUPPORT;
|
|
if (!nla[NFTA_SET_TABLE])
|
|
return -EINVAL;
|
|
|
|
set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
|
|
if (IS_ERR(set))
|
|
return PTR_ERR(set);
|
|
|
|
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
|
|
if (skb2 == NULL)
|
|
return -ENOMEM;
|
|
|
|
err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
|
|
if (err < 0)
|
|
goto err_fill_set_info;
|
|
|
|
return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
|
|
|
|
err_fill_set_info:
|
|
kfree_skb(skb2);
|
|
return err;
|
|
}
|
|
|
|
static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
|
|
[NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static int nft_set_desc_concat_parse(const struct nlattr *attr,
|
|
struct nft_set_desc *desc)
|
|
{
|
|
struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
|
|
u32 len;
|
|
int err;
|
|
|
|
if (desc->field_count >= ARRAY_SIZE(desc->field_len))
|
|
return -E2BIG;
|
|
|
|
err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
|
|
nft_concat_policy, NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (!tb[NFTA_SET_FIELD_LEN])
|
|
return -EINVAL;
|
|
|
|
len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
|
|
if (!len || len > U8_MAX)
|
|
return -EINVAL;
|
|
|
|
desc->field_len[desc->field_count++] = len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nft_set_desc_concat(struct nft_set_desc *desc,
|
|
const struct nlattr *nla)
|
|
{
|
|
struct nlattr *attr;
|
|
u32 num_regs = 0;
|
|
int rem, err, i;
|
|
|
|
nla_for_each_nested(attr, nla, rem) {
|
|
if (nla_type(attr) != NFTA_LIST_ELEM)
|
|
return -EINVAL;
|
|
|
|
err = nft_set_desc_concat_parse(attr, desc);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
for (i = 0; i < desc->field_count; i++)
|
|
num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
|
|
|
|
if (num_regs > NFT_REG32_COUNT)
|
|
return -E2BIG;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
|
|
const struct nlattr *nla)
|
|
{
|
|
struct nlattr *da[NFTA_SET_DESC_MAX + 1];
|
|
int err;
|
|
|
|
err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
|
|
nft_set_desc_policy, NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (da[NFTA_SET_DESC_SIZE] != NULL)
|
|
desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
|
|
if (da[NFTA_SET_DESC_CONCAT])
|
|
err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
|
|
const struct nlattr * const *nla,
|
|
struct nft_expr **exprs, int *num_exprs,
|
|
u32 flags)
|
|
{
|
|
struct nft_expr *expr;
|
|
int err, i;
|
|
|
|
if (nla[NFTA_SET_EXPR]) {
|
|
expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
|
|
if (IS_ERR(expr)) {
|
|
err = PTR_ERR(expr);
|
|
goto err_set_expr_alloc;
|
|
}
|
|
exprs[0] = expr;
|
|
(*num_exprs)++;
|
|
} else if (nla[NFTA_SET_EXPRESSIONS]) {
|
|
struct nlattr *tmp;
|
|
int left;
|
|
|
|
if (!(flags & NFT_SET_EXPR)) {
|
|
err = -EINVAL;
|
|
goto err_set_expr_alloc;
|
|
}
|
|
i = 0;
|
|
nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
|
|
if (i == NFT_SET_EXPR_MAX) {
|
|
err = -E2BIG;
|
|
goto err_set_expr_alloc;
|
|
}
|
|
if (nla_type(tmp) != NFTA_LIST_ELEM) {
|
|
err = -EINVAL;
|
|
goto err_set_expr_alloc;
|
|
}
|
|
expr = nft_set_elem_expr_alloc(ctx, set, tmp);
|
|
if (IS_ERR(expr)) {
|
|
err = PTR_ERR(expr);
|
|
goto err_set_expr_alloc;
|
|
}
|
|
exprs[i++] = expr;
|
|
(*num_exprs)++;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_set_expr_alloc:
|
|
for (i = 0; i < *num_exprs; i++)
|
|
nft_expr_destroy(ctx, exprs[i]);
|
|
|
|
return err;
|
|
}
|
|
|
|
static bool nft_set_is_same(const struct nft_set *set,
|
|
const struct nft_set_desc *desc,
|
|
struct nft_expr *exprs[], u32 num_exprs, u32 flags)
|
|
{
|
|
int i;
|
|
|
|
if (set->ktype != desc->ktype ||
|
|
set->dtype != desc->dtype ||
|
|
set->flags != flags ||
|
|
set->klen != desc->klen ||
|
|
set->dlen != desc->dlen ||
|
|
set->field_count != desc->field_count ||
|
|
set->num_exprs != num_exprs)
|
|
return false;
|
|
|
|
for (i = 0; i < desc->field_count; i++) {
|
|
if (set->field_len[i] != desc->field_len[i])
|
|
return false;
|
|
}
|
|
|
|
for (i = 0; i < num_exprs; i++) {
|
|
if (set->exprs[i]->ops != exprs[i]->ops)
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
struct netlink_ext_ack *extack = info->extack;
|
|
u8 genmask = nft_genmask_next(info->net);
|
|
u8 family = info->nfmsg->nfgen_family;
|
|
const struct nft_set_ops *ops;
|
|
struct net *net = info->net;
|
|
struct nft_set_desc desc;
|
|
struct nft_table *table;
|
|
unsigned char *udata;
|
|
struct nft_set *set;
|
|
struct nft_ctx ctx;
|
|
size_t alloc_size;
|
|
int num_exprs = 0;
|
|
char *name;
|
|
int err, i;
|
|
u16 udlen;
|
|
u32 flags;
|
|
u64 size;
|
|
|
|
if (nla[NFTA_SET_TABLE] == NULL ||
|
|
nla[NFTA_SET_NAME] == NULL ||
|
|
nla[NFTA_SET_KEY_LEN] == NULL ||
|
|
nla[NFTA_SET_ID] == NULL)
|
|
return -EINVAL;
|
|
|
|
memset(&desc, 0, sizeof(desc));
|
|
|
|
desc.ktype = NFT_DATA_VALUE;
|
|
if (nla[NFTA_SET_KEY_TYPE] != NULL) {
|
|
desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
|
|
if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
|
|
return -EINVAL;
|
|
}
|
|
|
|
desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
|
|
if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
|
|
return -EINVAL;
|
|
|
|
flags = 0;
|
|
if (nla[NFTA_SET_FLAGS] != NULL) {
|
|
flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
|
|
if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
|
|
NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
|
|
NFT_SET_MAP | NFT_SET_EVAL |
|
|
NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
|
|
return -EOPNOTSUPP;
|
|
/* Only one of these operations is supported */
|
|
if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
|
|
(NFT_SET_MAP | NFT_SET_OBJECT))
|
|
return -EOPNOTSUPP;
|
|
if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
|
|
(NFT_SET_EVAL | NFT_SET_OBJECT))
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
desc.dtype = 0;
|
|
if (nla[NFTA_SET_DATA_TYPE] != NULL) {
|
|
if (!(flags & NFT_SET_MAP))
|
|
return -EINVAL;
|
|
|
|
desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
|
|
if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
|
|
desc.dtype != NFT_DATA_VERDICT)
|
|
return -EINVAL;
|
|
|
|
if (desc.dtype != NFT_DATA_VERDICT) {
|
|
if (nla[NFTA_SET_DATA_LEN] == NULL)
|
|
return -EINVAL;
|
|
desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
|
|
if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
|
|
return -EINVAL;
|
|
} else
|
|
desc.dlen = sizeof(struct nft_verdict);
|
|
} else if (flags & NFT_SET_MAP)
|
|
return -EINVAL;
|
|
|
|
if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
|
|
if (!(flags & NFT_SET_OBJECT))
|
|
return -EINVAL;
|
|
|
|
desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
|
|
if (desc.objtype == NFT_OBJECT_UNSPEC ||
|
|
desc.objtype > NFT_OBJECT_MAX)
|
|
return -EOPNOTSUPP;
|
|
} else if (flags & NFT_SET_OBJECT)
|
|
return -EINVAL;
|
|
else
|
|
desc.objtype = NFT_OBJECT_UNSPEC;
|
|
|
|
desc.timeout = 0;
|
|
if (nla[NFTA_SET_TIMEOUT] != NULL) {
|
|
if (!(flags & NFT_SET_TIMEOUT))
|
|
return -EINVAL;
|
|
|
|
if (flags & NFT_SET_ANONYMOUS)
|
|
return -EOPNOTSUPP;
|
|
|
|
err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
|
|
if (err)
|
|
return err;
|
|
}
|
|
desc.gc_int = 0;
|
|
if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
|
|
if (!(flags & NFT_SET_TIMEOUT))
|
|
return -EINVAL;
|
|
|
|
if (flags & NFT_SET_ANONYMOUS)
|
|
return -EOPNOTSUPP;
|
|
|
|
desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
|
|
}
|
|
|
|
desc.policy = NFT_SET_POL_PERFORMANCE;
|
|
if (nla[NFTA_SET_POLICY] != NULL)
|
|
desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
|
|
|
|
if (nla[NFTA_SET_DESC] != NULL) {
|
|
err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
|
|
return -EINVAL;
|
|
} else if (flags & NFT_SET_CONCAT) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
|
|
desc.expr = true;
|
|
|
|
table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
|
|
NETLINK_CB(skb).portid);
|
|
if (IS_ERR(table)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
|
|
return PTR_ERR(table);
|
|
}
|
|
|
|
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
|
|
|
|
set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
|
|
if (IS_ERR(set)) {
|
|
if (PTR_ERR(set) != -ENOENT) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
|
|
return PTR_ERR(set);
|
|
}
|
|
} else {
|
|
struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
|
|
|
|
if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
|
|
return -EEXIST;
|
|
}
|
|
if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (nft_set_is_anonymous(set))
|
|
return -EOPNOTSUPP;
|
|
|
|
err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = 0;
|
|
if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
|
|
err = -EEXIST;
|
|
}
|
|
|
|
for (i = 0; i < num_exprs; i++)
|
|
nft_expr_destroy(&ctx, exprs[i]);
|
|
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
|
|
}
|
|
|
|
if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
|
|
return -ENOENT;
|
|
|
|
ops = nft_select_set_ops(&ctx, nla, &desc);
|
|
if (IS_ERR(ops))
|
|
return PTR_ERR(ops);
|
|
|
|
udlen = 0;
|
|
if (nla[NFTA_SET_USERDATA])
|
|
udlen = nla_len(nla[NFTA_SET_USERDATA]);
|
|
|
|
size = 0;
|
|
if (ops->privsize != NULL)
|
|
size = ops->privsize(nla, &desc);
|
|
alloc_size = sizeof(*set) + size + udlen;
|
|
if (alloc_size < size || alloc_size > INT_MAX)
|
|
return -ENOMEM;
|
|
|
|
if (!nft_use_inc(&table->use))
|
|
return -EMFILE;
|
|
|
|
set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
|
|
if (!set) {
|
|
err = -ENOMEM;
|
|
goto err_alloc;
|
|
}
|
|
|
|
name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
|
|
if (!name) {
|
|
err = -ENOMEM;
|
|
goto err_set_name;
|
|
}
|
|
|
|
err = nf_tables_set_alloc_name(&ctx, set, name);
|
|
kfree(name);
|
|
if (err < 0)
|
|
goto err_set_name;
|
|
|
|
udata = NULL;
|
|
if (udlen) {
|
|
udata = set->data + size;
|
|
nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
|
|
}
|
|
|
|
INIT_LIST_HEAD(&set->bindings);
|
|
INIT_LIST_HEAD(&set->catchall_list);
|
|
refcount_set(&set->refs, 1);
|
|
set->table = table;
|
|
write_pnet(&set->net, net);
|
|
set->ops = ops;
|
|
set->ktype = desc.ktype;
|
|
set->klen = desc.klen;
|
|
set->dtype = desc.dtype;
|
|
set->objtype = desc.objtype;
|
|
set->dlen = desc.dlen;
|
|
set->flags = flags;
|
|
set->size = desc.size;
|
|
set->policy = desc.policy;
|
|
set->udlen = udlen;
|
|
set->udata = udata;
|
|
set->timeout = desc.timeout;
|
|
set->gc_int = desc.gc_int;
|
|
|
|
set->field_count = desc.field_count;
|
|
for (i = 0; i < desc.field_count; i++)
|
|
set->field_len[i] = desc.field_len[i];
|
|
|
|
err = ops->init(set, &desc, nla);
|
|
if (err < 0)
|
|
goto err_set_init;
|
|
|
|
err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
|
|
if (err < 0)
|
|
goto err_set_destroy;
|
|
|
|
set->num_exprs = num_exprs;
|
|
set->handle = nf_tables_alloc_handle(table);
|
|
INIT_LIST_HEAD(&set->pending_update);
|
|
|
|
err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
|
|
if (err < 0)
|
|
goto err_set_expr_alloc;
|
|
|
|
list_add_tail_rcu(&set->list, &table->sets);
|
|
|
|
return 0;
|
|
|
|
err_set_expr_alloc:
|
|
for (i = 0; i < set->num_exprs; i++)
|
|
nft_expr_destroy(&ctx, set->exprs[i]);
|
|
err_set_destroy:
|
|
ops->destroy(&ctx, set);
|
|
err_set_init:
|
|
kfree(set->name);
|
|
err_set_name:
|
|
kvfree(set);
|
|
err_alloc:
|
|
nft_use_dec_restore(&table->use);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
|
|
struct nft_set *set)
|
|
{
|
|
struct nft_set_elem_catchall *next, *catchall;
|
|
|
|
list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
|
|
list_del_rcu(&catchall->list);
|
|
nf_tables_set_elem_destroy(ctx, set, catchall->elem);
|
|
kfree_rcu(catchall, rcu);
|
|
}
|
|
}
|
|
|
|
static void nft_set_put(struct nft_set *set)
|
|
{
|
|
if (refcount_dec_and_test(&set->refs)) {
|
|
kfree(set->name);
|
|
kvfree(set);
|
|
}
|
|
}
|
|
|
|
static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
|
|
{
|
|
int i;
|
|
|
|
if (WARN_ON(set->use > 0))
|
|
return;
|
|
|
|
for (i = 0; i < set->num_exprs; i++)
|
|
nft_expr_destroy(ctx, set->exprs[i]);
|
|
|
|
set->ops->destroy(ctx, set);
|
|
nft_set_catchall_destroy(ctx, set);
|
|
nft_set_put(set);
|
|
}
|
|
|
|
static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
struct netlink_ext_ack *extack = info->extack;
|
|
u8 genmask = nft_genmask_next(info->net);
|
|
u8 family = info->nfmsg->nfgen_family;
|
|
struct net *net = info->net;
|
|
const struct nlattr *attr;
|
|
struct nft_table *table;
|
|
struct nft_set *set;
|
|
struct nft_ctx ctx;
|
|
|
|
if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
|
|
return -EAFNOSUPPORT;
|
|
|
|
table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
|
|
genmask, NETLINK_CB(skb).portid);
|
|
if (IS_ERR(table)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
|
|
return PTR_ERR(table);
|
|
}
|
|
|
|
if (nla[NFTA_SET_HANDLE]) {
|
|
attr = nla[NFTA_SET_HANDLE];
|
|
set = nft_set_lookup_byhandle(table, attr, genmask);
|
|
} else {
|
|
attr = nla[NFTA_SET_NAME];
|
|
set = nft_set_lookup(table, attr, genmask);
|
|
}
|
|
|
|
if (IS_ERR(set)) {
|
|
if (PTR_ERR(set) == -ENOENT &&
|
|
NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
|
|
return 0;
|
|
|
|
NL_SET_BAD_ATTR(extack, attr);
|
|
return PTR_ERR(set);
|
|
}
|
|
if (set->use ||
|
|
(info->nlh->nlmsg_flags & NLM_F_NONREC &&
|
|
atomic_read(&set->nelems) > 0)) {
|
|
NL_SET_BAD_ATTR(extack, attr);
|
|
return -EBUSY;
|
|
}
|
|
|
|
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
|
|
|
|
return nft_delset(&ctx, set);
|
|
}
|
|
|
|
static int nft_validate_register_store(const struct nft_ctx *ctx,
|
|
enum nft_registers reg,
|
|
const struct nft_data *data,
|
|
enum nft_data_types type,
|
|
unsigned int len);
|
|
|
|
static int nft_setelem_data_validate(const struct nft_ctx *ctx,
|
|
struct nft_set *set,
|
|
struct nft_set_elem *elem)
|
|
{
|
|
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
|
|
enum nft_registers dreg;
|
|
|
|
dreg = nft_type_to_reg(set->dtype);
|
|
return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
|
|
set->dtype == NFT_DATA_VERDICT ?
|
|
NFT_DATA_VERDICT : NFT_DATA_VALUE,
|
|
set->dlen);
|
|
}
|
|
|
|
static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
|
|
struct nft_set *set,
|
|
const struct nft_set_iter *iter,
|
|
struct nft_set_elem *elem)
|
|
{
|
|
return nft_setelem_data_validate(ctx, set, elem);
|
|
}
|
|
|
|
static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
|
|
struct nft_set *set)
|
|
{
|
|
u8 genmask = nft_genmask_next(ctx->net);
|
|
struct nft_set_elem_catchall *catchall;
|
|
struct nft_set_elem elem;
|
|
struct nft_set_ext *ext;
|
|
int ret = 0;
|
|
|
|
list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
|
|
ext = nft_set_elem_ext(set, catchall->elem);
|
|
if (!nft_set_elem_active(ext, genmask))
|
|
continue;
|
|
|
|
elem.priv = catchall->elem;
|
|
ret = nft_setelem_data_validate(ctx, set, &elem);
|
|
if (ret < 0)
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
|
|
struct nft_set_binding *binding)
|
|
{
|
|
struct nft_set_binding *i;
|
|
struct nft_set_iter iter;
|
|
|
|
if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
|
|
return -EBUSY;
|
|
|
|
if (binding->flags & NFT_SET_MAP) {
|
|
/* If the set is already bound to the same chain all
|
|
* jumps are already validated for that chain.
|
|
*/
|
|
list_for_each_entry(i, &set->bindings, list) {
|
|
if (i->flags & NFT_SET_MAP &&
|
|
i->chain == binding->chain)
|
|
goto bind;
|
|
}
|
|
|
|
iter.genmask = nft_genmask_next(ctx->net);
|
|
iter.skip = 0;
|
|
iter.count = 0;
|
|
iter.err = 0;
|
|
iter.fn = nf_tables_bind_check_setelem;
|
|
|
|
set->ops->walk(ctx, set, &iter);
|
|
if (!iter.err)
|
|
iter.err = nft_set_catchall_bind_check(ctx, set);
|
|
|
|
if (iter.err < 0)
|
|
return iter.err;
|
|
}
|
|
bind:
|
|
if (!nft_use_inc(&set->use))
|
|
return -EMFILE;
|
|
|
|
binding->chain = ctx->chain;
|
|
list_add_tail_rcu(&binding->list, &set->bindings);
|
|
nft_set_trans_bind(ctx, set);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nf_tables_bind_set);
|
|
|
|
static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
|
|
struct nft_set_binding *binding, bool event)
|
|
{
|
|
list_del_rcu(&binding->list);
|
|
|
|
if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
|
|
list_del_rcu(&set->list);
|
|
if (event)
|
|
nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
|
|
GFP_KERNEL);
|
|
}
|
|
}
|
|
|
|
static void nft_setelem_data_activate(const struct net *net,
|
|
const struct nft_set *set,
|
|
struct nft_set_elem *elem);
|
|
|
|
static int nft_mapelem_activate(const struct nft_ctx *ctx,
|
|
struct nft_set *set,
|
|
const struct nft_set_iter *iter,
|
|
struct nft_set_elem *elem)
|
|
{
|
|
nft_setelem_data_activate(ctx->net, set, elem);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void nft_map_catchall_activate(const struct nft_ctx *ctx,
|
|
struct nft_set *set)
|
|
{
|
|
u8 genmask = nft_genmask_next(ctx->net);
|
|
struct nft_set_elem_catchall *catchall;
|
|
struct nft_set_elem elem;
|
|
struct nft_set_ext *ext;
|
|
|
|
list_for_each_entry(catchall, &set->catchall_list, list) {
|
|
ext = nft_set_elem_ext(set, catchall->elem);
|
|
if (!nft_set_elem_active(ext, genmask))
|
|
continue;
|
|
|
|
elem.priv = catchall->elem;
|
|
nft_setelem_data_activate(ctx->net, set, &elem);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
|
|
{
|
|
struct nft_set_iter iter = {
|
|
.genmask = nft_genmask_next(ctx->net),
|
|
.fn = nft_mapelem_activate,
|
|
};
|
|
|
|
set->ops->walk(ctx, set, &iter);
|
|
WARN_ON_ONCE(iter.err);
|
|
|
|
nft_map_catchall_activate(ctx, set);
|
|
}
|
|
|
|
void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
|
|
{
|
|
if (nft_set_is_anonymous(set)) {
|
|
if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
|
|
nft_map_activate(ctx, set);
|
|
|
|
nft_clear(ctx->net, set);
|
|
}
|
|
|
|
nft_use_inc_restore(&set->use);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nf_tables_activate_set);
|
|
|
|
void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
|
|
struct nft_set_binding *binding,
|
|
enum nft_trans_phase phase)
|
|
{
|
|
switch (phase) {
|
|
case NFT_TRANS_PREPARE_ERROR:
|
|
nft_set_trans_unbind(ctx, set);
|
|
if (nft_set_is_anonymous(set))
|
|
nft_deactivate_next(ctx->net, set);
|
|
else
|
|
list_del_rcu(&binding->list);
|
|
|
|
nft_use_dec(&set->use);
|
|
break;
|
|
case NFT_TRANS_PREPARE:
|
|
if (nft_set_is_anonymous(set)) {
|
|
if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
|
|
nft_map_deactivate(ctx, set);
|
|
|
|
nft_deactivate_next(ctx->net, set);
|
|
}
|
|
nft_use_dec(&set->use);
|
|
return;
|
|
case NFT_TRANS_ABORT:
|
|
case NFT_TRANS_RELEASE:
|
|
if (nft_set_is_anonymous(set) &&
|
|
set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
|
|
nft_map_deactivate(ctx, set);
|
|
|
|
nft_use_dec(&set->use);
|
|
fallthrough;
|
|
default:
|
|
nf_tables_unbind_set(ctx, set, binding,
|
|
phase == NFT_TRANS_COMMIT);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
|
|
|
|
void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
|
|
{
|
|
if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
|
|
nft_set_destroy(ctx, set);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
|
|
|
|
const struct nft_set_ext_type nft_set_ext_types[] = {
|
|
[NFT_SET_EXT_KEY] = {
|
|
.align = __alignof__(u32),
|
|
},
|
|
[NFT_SET_EXT_DATA] = {
|
|
.align = __alignof__(u32),
|
|
},
|
|
[NFT_SET_EXT_EXPRESSIONS] = {
|
|
.align = __alignof__(struct nft_set_elem_expr),
|
|
},
|
|
[NFT_SET_EXT_OBJREF] = {
|
|
.len = sizeof(struct nft_object *),
|
|
.align = __alignof__(struct nft_object *),
|
|
},
|
|
[NFT_SET_EXT_FLAGS] = {
|
|
.len = sizeof(u8),
|
|
.align = __alignof__(u8),
|
|
},
|
|
[NFT_SET_EXT_TIMEOUT] = {
|
|
.len = sizeof(u64),
|
|
.align = __alignof__(u64),
|
|
},
|
|
[NFT_SET_EXT_EXPIRATION] = {
|
|
.len = sizeof(u64),
|
|
.align = __alignof__(u64),
|
|
},
|
|
[NFT_SET_EXT_USERDATA] = {
|
|
.len = sizeof(struct nft_userdata),
|
|
.align = __alignof__(struct nft_userdata),
|
|
},
|
|
[NFT_SET_EXT_KEY_END] = {
|
|
.align = __alignof__(u32),
|
|
},
|
|
};
|
|
|
|
/*
|
|
* Set elements
|
|
*/
|
|
|
|
static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
|
|
[NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
|
|
[NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
|
|
[NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
|
|
[NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
|
|
[NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
|
|
[NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
|
|
.len = NFT_USERDATA_MAXLEN },
|
|
[NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
|
|
[NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
|
|
.len = NFT_OBJ_MAXNAMELEN - 1 },
|
|
[NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
|
|
[NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
|
|
};
|
|
|
|
static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
|
|
[NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
|
|
.len = NFT_TABLE_MAXNAMELEN - 1 },
|
|
[NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
|
|
.len = NFT_SET_MAXNAMELEN - 1 },
|
|
[NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
|
|
[NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static int nft_set_elem_expr_dump(struct sk_buff *skb,
|
|
const struct nft_set *set,
|
|
const struct nft_set_ext *ext)
|
|
{
|
|
struct nft_set_elem_expr *elem_expr;
|
|
u32 size, num_exprs = 0;
|
|
struct nft_expr *expr;
|
|
struct nlattr *nest;
|
|
|
|
elem_expr = nft_set_ext_expr(ext);
|
|
nft_setelem_expr_foreach(expr, elem_expr, size)
|
|
num_exprs++;
|
|
|
|
if (num_exprs == 1) {
|
|
expr = nft_setelem_expr_at(elem_expr, 0);
|
|
if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, false) < 0)
|
|
return -1;
|
|
|
|
return 0;
|
|
} else if (num_exprs > 1) {
|
|
nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
|
|
nft_setelem_expr_foreach(expr, elem_expr, size) {
|
|
expr = nft_setelem_expr_at(elem_expr, size);
|
|
if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, false) < 0)
|
|
goto nla_put_failure;
|
|
}
|
|
nla_nest_end(skb, nest);
|
|
}
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
static int nf_tables_fill_setelem(struct sk_buff *skb,
|
|
const struct nft_set *set,
|
|
const struct nft_set_elem *elem)
|
|
{
|
|
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
|
|
unsigned char *b = skb_tail_pointer(skb);
|
|
struct nlattr *nest;
|
|
|
|
nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
|
|
nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
|
|
NFT_DATA_VALUE, set->klen) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
|
|
nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
|
|
NFT_DATA_VALUE, set->klen) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
|
|
nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
|
|
set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
|
|
set->dlen) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
|
|
nft_set_elem_expr_dump(skb, set, ext))
|
|
goto nla_put_failure;
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
|
|
nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
|
|
(*nft_set_ext_obj(ext))->key.name) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
|
|
nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
|
|
htonl(*nft_set_ext_flags(ext))))
|
|
goto nla_put_failure;
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
|
|
nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
|
|
nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
|
|
NFTA_SET_ELEM_PAD))
|
|
goto nla_put_failure;
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
|
|
u64 expires, now = get_jiffies_64();
|
|
|
|
expires = *nft_set_ext_expiration(ext);
|
|
if (time_before64(now, expires))
|
|
expires -= now;
|
|
else
|
|
expires = 0;
|
|
|
|
if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
|
|
nf_jiffies64_to_msecs(expires),
|
|
NFTA_SET_ELEM_PAD))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
|
|
struct nft_userdata *udata;
|
|
|
|
udata = nft_set_ext_userdata(ext);
|
|
if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
|
|
udata->len + 1, udata->data))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
nla_nest_end(skb, nest);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, b);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
struct nft_set_dump_args {
|
|
const struct netlink_callback *cb;
|
|
struct nft_set_iter iter;
|
|
struct sk_buff *skb;
|
|
};
|
|
|
|
static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
|
|
struct nft_set *set,
|
|
const struct nft_set_iter *iter,
|
|
struct nft_set_elem *elem)
|
|
{
|
|
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
|
|
struct nft_set_dump_args *args;
|
|
|
|
if (nft_set_elem_expired(ext))
|
|
return 0;
|
|
|
|
args = container_of(iter, struct nft_set_dump_args, iter);
|
|
return nf_tables_fill_setelem(args->skb, set, elem);
|
|
}
|
|
|
|
struct nft_set_dump_ctx {
|
|
const struct nft_set *set;
|
|
struct nft_ctx ctx;
|
|
};
|
|
|
|
static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
|
|
const struct nft_set *set)
|
|
{
|
|
struct nft_set_elem_catchall *catchall;
|
|
u8 genmask = nft_genmask_cur(net);
|
|
struct nft_set_elem elem;
|
|
struct nft_set_ext *ext;
|
|
int ret = 0;
|
|
|
|
list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
|
|
ext = nft_set_elem_ext(set, catchall->elem);
|
|
if (!nft_set_elem_active(ext, genmask) ||
|
|
nft_set_elem_expired(ext))
|
|
continue;
|
|
|
|
elem.priv = catchall->elem;
|
|
ret = nf_tables_fill_setelem(skb, set, &elem);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct nft_set_dump_ctx *dump_ctx = cb->data;
|
|
struct net *net = sock_net(skb->sk);
|
|
struct nftables_pernet *nft_net;
|
|
struct nft_table *table;
|
|
struct nft_set *set;
|
|
struct nft_set_dump_args args;
|
|
bool set_found = false;
|
|
struct nlmsghdr *nlh;
|
|
struct nlattr *nest;
|
|
u32 portid, seq;
|
|
int event;
|
|
|
|
rcu_read_lock();
|
|
nft_net = nft_pernet(net);
|
|
cb->seq = READ_ONCE(nft_net->base_seq);
|
|
|
|
list_for_each_entry_rcu(table, &nft_net->tables, list) {
|
|
if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
|
|
dump_ctx->ctx.family != table->family)
|
|
continue;
|
|
|
|
if (table != dump_ctx->ctx.table)
|
|
continue;
|
|
|
|
list_for_each_entry_rcu(set, &table->sets, list) {
|
|
if (set == dump_ctx->set) {
|
|
set_found = true;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (!set_found) {
|
|
rcu_read_unlock();
|
|
return -ENOENT;
|
|
}
|
|
|
|
event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
|
|
portid = NETLINK_CB(cb->skb).portid;
|
|
seq = cb->nlh->nlmsg_seq;
|
|
|
|
nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
|
|
table->family, NFNETLINK_V0, nft_base_seq(net));
|
|
if (!nlh)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
|
|
goto nla_put_failure;
|
|
if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
|
|
goto nla_put_failure;
|
|
|
|
nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
|
|
args.cb = cb;
|
|
args.skb = skb;
|
|
args.iter.genmask = nft_genmask_cur(net);
|
|
args.iter.skip = cb->args[0];
|
|
args.iter.count = 0;
|
|
args.iter.err = 0;
|
|
args.iter.fn = nf_tables_dump_setelem;
|
|
set->ops->walk(&dump_ctx->ctx, set, &args.iter);
|
|
|
|
if (!args.iter.err && args.iter.count == cb->args[0])
|
|
args.iter.err = nft_set_catchall_dump(net, skb, set);
|
|
rcu_read_unlock();
|
|
|
|
nla_nest_end(skb, nest);
|
|
nlmsg_end(skb, nlh);
|
|
|
|
if (args.iter.err && args.iter.err != -EMSGSIZE)
|
|
return args.iter.err;
|
|
if (args.iter.count == cb->args[0])
|
|
return 0;
|
|
|
|
cb->args[0] = args.iter.count;
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
rcu_read_unlock();
|
|
return -ENOSPC;
|
|
}
|
|
|
|
static int nf_tables_dump_set_start(struct netlink_callback *cb)
|
|
{
|
|
struct nft_set_dump_ctx *dump_ctx = cb->data;
|
|
|
|
cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
|
|
|
|
return cb->data ? 0 : -ENOMEM;
|
|
}
|
|
|
|
static int nf_tables_dump_set_done(struct netlink_callback *cb)
|
|
{
|
|
kfree(cb->data);
|
|
return 0;
|
|
}
|
|
|
|
static int nf_tables_fill_setelem_info(struct sk_buff *skb,
|
|
const struct nft_ctx *ctx, u32 seq,
|
|
u32 portid, int event, u16 flags,
|
|
const struct nft_set *set,
|
|
const struct nft_set_elem *elem)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct nlattr *nest;
|
|
int err;
|
|
|
|
event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
|
|
nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
|
|
NFNETLINK_V0, nft_base_seq(ctx->net));
|
|
if (!nlh)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
|
|
goto nla_put_failure;
|
|
if (nla_put_string(skb, NFTA_SET_NAME, set->name))
|
|
goto nla_put_failure;
|
|
|
|
nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
|
|
err = nf_tables_fill_setelem(skb, set, elem);
|
|
if (err < 0)
|
|
goto nla_put_failure;
|
|
|
|
nla_nest_end(skb, nest);
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, nlh);
|
|
return -1;
|
|
}
|
|
|
|
static int nft_setelem_parse_flags(const struct nft_set *set,
|
|
const struct nlattr *attr, u32 *flags)
|
|
{
|
|
if (attr == NULL)
|
|
return 0;
|
|
|
|
*flags = ntohl(nla_get_be32(attr));
|
|
if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
|
|
return -EOPNOTSUPP;
|
|
if (!(set->flags & NFT_SET_INTERVAL) &&
|
|
*flags & NFT_SET_ELEM_INTERVAL_END)
|
|
return -EINVAL;
|
|
if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
|
|
(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
|
|
struct nft_data *key, struct nlattr *attr)
|
|
{
|
|
struct nft_data_desc desc = {
|
|
.type = NFT_DATA_VALUE,
|
|
.size = NFT_DATA_VALUE_MAXLEN,
|
|
.len = set->klen,
|
|
};
|
|
|
|
return nft_data_init(ctx, key, &desc, attr);
|
|
}
|
|
|
|
static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
|
|
struct nft_data_desc *desc,
|
|
struct nft_data *data,
|
|
struct nlattr *attr)
|
|
{
|
|
u32 dtype;
|
|
|
|
if (set->dtype == NFT_DATA_VERDICT)
|
|
dtype = NFT_DATA_VERDICT;
|
|
else
|
|
dtype = NFT_DATA_VALUE;
|
|
|
|
desc->type = dtype;
|
|
desc->size = NFT_DATA_VALUE_MAXLEN;
|
|
desc->len = set->dlen;
|
|
desc->flags = NFT_DATA_DESC_SETELEM;
|
|
|
|
return nft_data_init(ctx, data, desc, attr);
|
|
}
|
|
|
|
static void *nft_setelem_catchall_get(const struct net *net,
|
|
const struct nft_set *set)
|
|
{
|
|
struct nft_set_elem_catchall *catchall;
|
|
u8 genmask = nft_genmask_cur(net);
|
|
struct nft_set_ext *ext;
|
|
void *priv = NULL;
|
|
|
|
list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
|
|
ext = nft_set_elem_ext(set, catchall->elem);
|
|
if (!nft_set_elem_active(ext, genmask) ||
|
|
nft_set_elem_expired(ext))
|
|
continue;
|
|
|
|
priv = catchall->elem;
|
|
break;
|
|
}
|
|
|
|
return priv;
|
|
}
|
|
|
|
static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
|
|
struct nft_set_elem *elem, u32 flags)
|
|
{
|
|
void *priv;
|
|
|
|
if (!(flags & NFT_SET_ELEM_CATCHALL)) {
|
|
priv = set->ops->get(ctx->net, set, elem, flags);
|
|
if (IS_ERR(priv))
|
|
return PTR_ERR(priv);
|
|
} else {
|
|
priv = nft_setelem_catchall_get(ctx->net, set);
|
|
if (!priv)
|
|
return -ENOENT;
|
|
}
|
|
elem->priv = priv;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
|
|
const struct nlattr *attr)
|
|
{
|
|
struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
|
|
struct nft_set_elem elem;
|
|
struct sk_buff *skb;
|
|
uint32_t flags = 0;
|
|
int err;
|
|
|
|
err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
|
|
nft_set_elem_policy, NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
|
|
return -EINVAL;
|
|
|
|
if (nla[NFTA_SET_ELEM_KEY]) {
|
|
err = nft_setelem_parse_key(ctx, set, &elem.key.val,
|
|
nla[NFTA_SET_ELEM_KEY]);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
if (nla[NFTA_SET_ELEM_KEY_END]) {
|
|
err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
|
|
nla[NFTA_SET_ELEM_KEY_END]);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
err = nft_setelem_get(ctx, set, &elem, flags);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = -ENOMEM;
|
|
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
|
|
if (skb == NULL)
|
|
return err;
|
|
|
|
err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
|
|
NFT_MSG_NEWSETELEM, 0, set, &elem);
|
|
if (err < 0)
|
|
goto err_fill_setelem;
|
|
|
|
return nfnetlink_unicast(skb, ctx->net, ctx->portid);
|
|
|
|
err_fill_setelem:
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
/* called with rcu_read_lock held */
|
|
static int nf_tables_getsetelem(struct sk_buff *skb,
|
|
const struct nfnl_info *info,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
struct netlink_ext_ack *extack = info->extack;
|
|
u8 genmask = nft_genmask_cur(info->net);
|
|
u8 family = info->nfmsg->nfgen_family;
|
|
struct net *net = info->net;
|
|
struct nft_table *table;
|
|
struct nft_set *set;
|
|
struct nlattr *attr;
|
|
struct nft_ctx ctx;
|
|
int rem, err = 0;
|
|
|
|
table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
|
|
genmask, 0);
|
|
if (IS_ERR(table)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
|
|
return PTR_ERR(table);
|
|
}
|
|
|
|
set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
|
|
if (IS_ERR(set))
|
|
return PTR_ERR(set);
|
|
|
|
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
|
|
|
|
if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
struct netlink_dump_control c = {
|
|
.start = nf_tables_dump_set_start,
|
|
.dump = nf_tables_dump_set,
|
|
.done = nf_tables_dump_set_done,
|
|
.module = THIS_MODULE,
|
|
};
|
|
struct nft_set_dump_ctx dump_ctx = {
|
|
.set = set,
|
|
.ctx = ctx,
|
|
};
|
|
|
|
c.data = &dump_ctx;
|
|
return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
|
|
}
|
|
|
|
if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
|
|
return -EINVAL;
|
|
|
|
nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
|
|
err = nft_get_set_elem(&ctx, set, attr);
|
|
if (err < 0) {
|
|
NL_SET_BAD_ATTR(extack, attr);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
|
|
const struct nft_set *set,
|
|
const struct nft_set_elem *elem,
|
|
int event)
|
|
{
|
|
struct nftables_pernet *nft_net;
|
|
struct net *net = ctx->net;
|
|
u32 portid = ctx->portid;
|
|
struct sk_buff *skb;
|
|
u16 flags = 0;
|
|
int err;
|
|
|
|
if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
|
|
return;
|
|
|
|
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (skb == NULL)
|
|
goto err;
|
|
|
|
if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
|
|
flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
|
|
|
|
err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
|
|
set, elem);
|
|
if (err < 0) {
|
|
kfree_skb(skb);
|
|
goto err;
|
|
}
|
|
|
|
nft_net = nft_pernet(net);
|
|
nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
|
|
return;
|
|
err:
|
|
nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
|
|
}
|
|
|
|
static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
|
|
int msg_type,
|
|
struct nft_set *set)
|
|
{
|
|
struct nft_trans *trans;
|
|
|
|
trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
|
|
if (trans == NULL)
|
|
return NULL;
|
|
|
|
nft_trans_elem_set(trans) = set;
|
|
return trans;
|
|
}
|
|
|
|
struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
|
|
const struct nft_set *set,
|
|
const struct nlattr *attr)
|
|
{
|
|
struct nft_expr *expr;
|
|
int err;
|
|
|
|
expr = nft_expr_init(ctx, attr);
|
|
if (IS_ERR(expr))
|
|
return expr;
|
|
|
|
err = -EOPNOTSUPP;
|
|
if (expr->ops->type->flags & NFT_EXPR_GC) {
|
|
if (set->flags & NFT_SET_TIMEOUT)
|
|
goto err_set_elem_expr;
|
|
if (!set->ops->gc_init)
|
|
goto err_set_elem_expr;
|
|
set->ops->gc_init(set);
|
|
}
|
|
|
|
return expr;
|
|
|
|
err_set_elem_expr:
|
|
nft_expr_destroy(ctx, expr);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
|
|
{
|
|
len += nft_set_ext_types[id].len;
|
|
if (len > tmpl->ext_len[id] ||
|
|
len > U8_MAX)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
|
|
void *to, const void *from, u32 len)
|
|
{
|
|
if (nft_set_ext_check(tmpl, id, len) < 0)
|
|
return -1;
|
|
|
|
memcpy(to, from, len);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void *nft_set_elem_init(const struct nft_set *set,
|
|
const struct nft_set_ext_tmpl *tmpl,
|
|
const u32 *key, const u32 *key_end,
|
|
const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
|
|
{
|
|
struct nft_set_ext *ext;
|
|
void *elem;
|
|
|
|
elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
|
|
if (elem == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
ext = nft_set_elem_ext(set, elem);
|
|
nft_set_ext_init(ext, tmpl);
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
|
|
nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
|
|
nft_set_ext_key(ext), key, set->klen) < 0)
|
|
goto err_ext_check;
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
|
|
nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
|
|
nft_set_ext_key_end(ext), key_end, set->klen) < 0)
|
|
goto err_ext_check;
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
|
|
nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
|
|
nft_set_ext_data(ext), data, set->dlen) < 0)
|
|
goto err_ext_check;
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
|
|
*nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
|
|
if (expiration == 0)
|
|
*nft_set_ext_expiration(ext) += timeout;
|
|
}
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
|
|
*nft_set_ext_timeout(ext) = timeout;
|
|
|
|
return elem;
|
|
|
|
err_ext_check:
|
|
kfree(elem);
|
|
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
|
|
struct nft_expr *expr)
|
|
{
|
|
if (expr->ops->destroy_clone) {
|
|
expr->ops->destroy_clone(ctx, expr);
|
|
module_put(expr->ops->type->owner);
|
|
} else {
|
|
nf_tables_expr_destroy(ctx, expr);
|
|
}
|
|
}
|
|
|
|
static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
|
|
struct nft_set_elem_expr *elem_expr)
|
|
{
|
|
struct nft_expr *expr;
|
|
u32 size;
|
|
|
|
nft_setelem_expr_foreach(expr, elem_expr, size)
|
|
__nft_set_elem_expr_destroy(ctx, expr);
|
|
}
|
|
|
|
/* Drop references and destroy. Called from gc, dynset and abort path. */
|
|
void nft_set_elem_destroy(const struct nft_set *set, void *elem,
|
|
bool destroy_expr)
|
|
{
|
|
struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
|
|
struct nft_ctx ctx = {
|
|
.net = read_pnet(&set->net),
|
|
.family = set->table->family,
|
|
};
|
|
|
|
nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
|
|
nft_data_release(nft_set_ext_data(ext), set->dtype);
|
|
if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
|
|
nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
|
|
nft_use_dec(&(*nft_set_ext_obj(ext))->use);
|
|
kfree(elem);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
|
|
|
|
/* Destroy element. References have been already dropped in the preparation
|
|
* path via nft_setelem_data_deactivate().
|
|
*/
|
|
void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
|
|
const struct nft_set *set, void *elem)
|
|
{
|
|
struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
|
|
nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
|
|
|
|
kfree(elem);
|
|
}
|
|
|
|
int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
|
|
struct nft_expr *expr_array[])
|
|
{
|
|
struct nft_expr *expr;
|
|
int err, i, k;
|
|
|
|
for (i = 0; i < set->num_exprs; i++) {
|
|
expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
|
|
if (!expr)
|
|
goto err_expr;
|
|
|
|
err = nft_expr_clone(expr, set->exprs[i]);
|
|
if (err < 0) {
|
|
kfree(expr);
|
|
goto err_expr;
|
|
}
|
|
expr_array[i] = expr;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_expr:
|
|
for (k = i - 1; k >= 0; k--)
|
|
nft_expr_destroy(ctx, expr_array[k]);
|
|
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
|
|
const struct nft_set_ext_tmpl *tmpl,
|
|
const struct nft_set_ext *ext,
|
|
struct nft_expr *expr_array[],
|
|
u32 num_exprs)
|
|
{
|
|
struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
|
|
u32 len = sizeof(struct nft_set_elem_expr);
|
|
struct nft_expr *expr;
|
|
int i, err;
|
|
|
|
if (num_exprs == 0)
|
|
return 0;
|
|
|
|
for (i = 0; i < num_exprs; i++)
|
|
len += expr_array[i]->ops->size;
|
|
|
|
if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < num_exprs; i++) {
|
|
expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
|
|
err = nft_expr_clone(expr, expr_array[i]);
|
|
if (err < 0)
|
|
goto err_elem_expr_setup;
|
|
|
|
elem_expr->size += expr_array[i]->ops->size;
|
|
nft_expr_destroy(ctx, expr_array[i]);
|
|
expr_array[i] = NULL;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_elem_expr_setup:
|
|
for (; i < num_exprs; i++) {
|
|
nft_expr_destroy(ctx, expr_array[i]);
|
|
expr_array[i] = NULL;
|
|
}
|
|
|
|
return -ENOMEM;
|
|
}
|
|
|
|
struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
|
|
const struct nft_set *set)
|
|
{
|
|
struct nft_set_elem_catchall *catchall;
|
|
u8 genmask = nft_genmask_cur(net);
|
|
struct nft_set_ext *ext;
|
|
|
|
list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
|
|
ext = nft_set_elem_ext(set, catchall->elem);
|
|
if (nft_set_elem_active(ext, genmask) &&
|
|
!nft_set_elem_expired(ext) &&
|
|
!nft_set_elem_is_dead(ext))
|
|
return ext;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
|
|
|
|
void *nft_set_catchall_gc(const struct nft_set *set)
|
|
{
|
|
struct nft_set_elem_catchall *catchall, *next;
|
|
struct nft_set_ext *ext;
|
|
void *elem = NULL;
|
|
|
|
list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
|
|
ext = nft_set_elem_ext(set, catchall->elem);
|
|
|
|
if (!nft_set_elem_expired(ext) ||
|
|
nft_set_elem_mark_busy(ext))
|
|
continue;
|
|
|
|
elem = catchall->elem;
|
|
list_del_rcu(&catchall->list);
|
|
kfree_rcu(catchall, rcu);
|
|
break;
|
|
}
|
|
|
|
return elem;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
|
|
|
|
static int nft_setelem_catchall_insert(const struct net *net,
|
|
struct nft_set *set,
|
|
const struct nft_set_elem *elem,
|
|
struct nft_set_ext **pext)
|
|
{
|
|
struct nft_set_elem_catchall *catchall;
|
|
u8 genmask = nft_genmask_next(net);
|
|
struct nft_set_ext *ext;
|
|
|
|
list_for_each_entry(catchall, &set->catchall_list, list) {
|
|
ext = nft_set_elem_ext(set, catchall->elem);
|
|
if (nft_set_elem_active(ext, genmask)) {
|
|
*pext = ext;
|
|
return -EEXIST;
|
|
}
|
|
}
|
|
|
|
catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
|
|
if (!catchall)
|
|
return -ENOMEM;
|
|
|
|
catchall->elem = elem->priv;
|
|
list_add_tail_rcu(&catchall->list, &set->catchall_list);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nft_setelem_insert(const struct net *net,
|
|
struct nft_set *set,
|
|
const struct nft_set_elem *elem,
|
|
struct nft_set_ext **ext, unsigned int flags)
|
|
{
|
|
int ret;
|
|
|
|
if (flags & NFT_SET_ELEM_CATCHALL)
|
|
ret = nft_setelem_catchall_insert(net, set, elem, ext);
|
|
else
|
|
ret = set->ops->insert(net, set, elem, ext);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static bool nft_setelem_is_catchall(const struct nft_set *set,
|
|
const struct nft_set_elem *elem)
|
|
{
|
|
struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
|
|
*nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static void nft_setelem_activate(struct net *net, struct nft_set *set,
|
|
struct nft_set_elem *elem)
|
|
{
|
|
struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
|
|
|
|
if (nft_setelem_is_catchall(set, elem)) {
|
|
nft_set_elem_change_active(net, set, ext);
|
|
} else {
|
|
set->ops->activate(net, set, elem);
|
|
}
|
|
}
|
|
|
|
static int nft_setelem_catchall_deactivate(const struct net *net,
|
|
struct nft_set *set,
|
|
struct nft_set_elem *elem)
|
|
{
|
|
struct nft_set_elem_catchall *catchall;
|
|
struct nft_set_ext *ext;
|
|
|
|
list_for_each_entry(catchall, &set->catchall_list, list) {
|
|
ext = nft_set_elem_ext(set, catchall->elem);
|
|
if (!nft_is_active(net, ext))
|
|
continue;
|
|
|
|
kfree(elem->priv);
|
|
elem->priv = catchall->elem;
|
|
nft_set_elem_change_active(net, set, ext);
|
|
return 0;
|
|
}
|
|
|
|
return -ENOENT;
|
|
}
|
|
|
|
static int __nft_setelem_deactivate(const struct net *net,
|
|
struct nft_set *set,
|
|
struct nft_set_elem *elem)
|
|
{
|
|
void *priv;
|
|
|
|
priv = set->ops->deactivate(net, set, elem);
|
|
if (!priv)
|
|
return -ENOENT;
|
|
|
|
kfree(elem->priv);
|
|
elem->priv = priv;
|
|
set->ndeact++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nft_setelem_deactivate(const struct net *net,
|
|
struct nft_set *set,
|
|
struct nft_set_elem *elem, u32 flags)
|
|
{
|
|
int ret;
|
|
|
|
if (flags & NFT_SET_ELEM_CATCHALL)
|
|
ret = nft_setelem_catchall_deactivate(net, set, elem);
|
|
else
|
|
ret = __nft_setelem_deactivate(net, set, elem);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void nft_setelem_catchall_remove(const struct net *net,
|
|
const struct nft_set *set,
|
|
const struct nft_set_elem *elem)
|
|
{
|
|
struct nft_set_elem_catchall *catchall, *next;
|
|
|
|
list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
|
|
if (catchall->elem == elem->priv) {
|
|
list_del_rcu(&catchall->list);
|
|
kfree_rcu(catchall, rcu);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void nft_setelem_remove(const struct net *net,
|
|
const struct nft_set *set,
|
|
const struct nft_set_elem *elem)
|
|
{
|
|
if (nft_setelem_is_catchall(set, elem))
|
|
nft_setelem_catchall_remove(net, set, elem);
|
|
else
|
|
set->ops->remove(net, set, elem);
|
|
}
|
|
|
|
static bool nft_setelem_valid_key_end(const struct nft_set *set,
|
|
struct nlattr **nla, u32 flags)
|
|
{
|
|
if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
|
|
(NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
|
|
if (flags & NFT_SET_ELEM_INTERVAL_END)
|
|
return false;
|
|
|
|
if (nla[NFTA_SET_ELEM_KEY_END] &&
|
|
flags & NFT_SET_ELEM_CATCHALL)
|
|
return false;
|
|
} else {
|
|
if (nla[NFTA_SET_ELEM_KEY_END])
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
|
|
const struct nlattr *attr, u32 nlmsg_flags)
|
|
{
|
|
struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
|
|
struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
|
|
u8 genmask = nft_genmask_next(ctx->net);
|
|
u32 flags = 0, size = 0, num_exprs = 0;
|
|
struct nft_set_ext_tmpl tmpl;
|
|
struct nft_set_ext *ext, *ext2;
|
|
struct nft_set_elem elem;
|
|
struct nft_set_binding *binding;
|
|
struct nft_object *obj = NULL;
|
|
struct nft_userdata *udata;
|
|
struct nft_data_desc desc;
|
|
enum nft_registers dreg;
|
|
struct nft_trans *trans;
|
|
u64 timeout;
|
|
u64 expiration;
|
|
int err, i;
|
|
u8 ulen;
|
|
|
|
err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
|
|
nft_set_elem_policy, NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
nft_set_ext_prepare(&tmpl);
|
|
|
|
err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
|
|
(!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
|
|
return -EINVAL;
|
|
|
|
if (flags != 0) {
|
|
err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
if (set->flags & NFT_SET_MAP) {
|
|
if (nla[NFTA_SET_ELEM_DATA] == NULL &&
|
|
!(flags & NFT_SET_ELEM_INTERVAL_END))
|
|
return -EINVAL;
|
|
} else {
|
|
if (nla[NFTA_SET_ELEM_DATA] != NULL)
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (set->flags & NFT_SET_OBJECT) {
|
|
if (!nla[NFTA_SET_ELEM_OBJREF] &&
|
|
!(flags & NFT_SET_ELEM_INTERVAL_END))
|
|
return -EINVAL;
|
|
} else {
|
|
if (nla[NFTA_SET_ELEM_OBJREF])
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!nft_setelem_valid_key_end(set, nla, flags))
|
|
return -EINVAL;
|
|
|
|
if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
|
|
(nla[NFTA_SET_ELEM_DATA] ||
|
|
nla[NFTA_SET_ELEM_OBJREF] ||
|
|
nla[NFTA_SET_ELEM_TIMEOUT] ||
|
|
nla[NFTA_SET_ELEM_EXPIRATION] ||
|
|
nla[NFTA_SET_ELEM_USERDATA] ||
|
|
nla[NFTA_SET_ELEM_EXPR] ||
|
|
nla[NFTA_SET_ELEM_KEY_END] ||
|
|
nla[NFTA_SET_ELEM_EXPRESSIONS]))
|
|
return -EINVAL;
|
|
|
|
timeout = 0;
|
|
if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
|
|
if (!(set->flags & NFT_SET_TIMEOUT))
|
|
return -EINVAL;
|
|
err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
|
|
&timeout);
|
|
if (err)
|
|
return err;
|
|
} else if (set->flags & NFT_SET_TIMEOUT &&
|
|
!(flags & NFT_SET_ELEM_INTERVAL_END)) {
|
|
timeout = READ_ONCE(set->timeout);
|
|
}
|
|
|
|
expiration = 0;
|
|
if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
|
|
if (!(set->flags & NFT_SET_TIMEOUT))
|
|
return -EINVAL;
|
|
err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
|
|
&expiration);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
if (nla[NFTA_SET_ELEM_EXPR]) {
|
|
struct nft_expr *expr;
|
|
|
|
if (set->num_exprs && set->num_exprs != 1)
|
|
return -EOPNOTSUPP;
|
|
|
|
expr = nft_set_elem_expr_alloc(ctx, set,
|
|
nla[NFTA_SET_ELEM_EXPR]);
|
|
if (IS_ERR(expr))
|
|
return PTR_ERR(expr);
|
|
|
|
expr_array[0] = expr;
|
|
num_exprs = 1;
|
|
|
|
if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
|
|
err = -EOPNOTSUPP;
|
|
goto err_set_elem_expr;
|
|
}
|
|
} else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
|
|
struct nft_expr *expr;
|
|
struct nlattr *tmp;
|
|
int left;
|
|
|
|
i = 0;
|
|
nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
|
|
if (i == NFT_SET_EXPR_MAX ||
|
|
(set->num_exprs && set->num_exprs == i)) {
|
|
err = -E2BIG;
|
|
goto err_set_elem_expr;
|
|
}
|
|
if (nla_type(tmp) != NFTA_LIST_ELEM) {
|
|
err = -EINVAL;
|
|
goto err_set_elem_expr;
|
|
}
|
|
expr = nft_set_elem_expr_alloc(ctx, set, tmp);
|
|
if (IS_ERR(expr)) {
|
|
err = PTR_ERR(expr);
|
|
goto err_set_elem_expr;
|
|
}
|
|
expr_array[i] = expr;
|
|
num_exprs++;
|
|
|
|
if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
|
|
err = -EOPNOTSUPP;
|
|
goto err_set_elem_expr;
|
|
}
|
|
i++;
|
|
}
|
|
if (set->num_exprs && set->num_exprs != i) {
|
|
err = -EOPNOTSUPP;
|
|
goto err_set_elem_expr;
|
|
}
|
|
} else if (set->num_exprs > 0 &&
|
|
!(flags & NFT_SET_ELEM_INTERVAL_END)) {
|
|
err = nft_set_elem_expr_clone(ctx, set, expr_array);
|
|
if (err < 0)
|
|
goto err_set_elem_expr_clone;
|
|
|
|
num_exprs = set->num_exprs;
|
|
}
|
|
|
|
if (nla[NFTA_SET_ELEM_KEY]) {
|
|
err = nft_setelem_parse_key(ctx, set, &elem.key.val,
|
|
nla[NFTA_SET_ELEM_KEY]);
|
|
if (err < 0)
|
|
goto err_set_elem_expr;
|
|
|
|
err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
|
|
if (err < 0)
|
|
goto err_parse_key;
|
|
}
|
|
|
|
if (nla[NFTA_SET_ELEM_KEY_END]) {
|
|
err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
|
|
nla[NFTA_SET_ELEM_KEY_END]);
|
|
if (err < 0)
|
|
goto err_parse_key;
|
|
|
|
err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
|
|
if (err < 0)
|
|
goto err_parse_key_end;
|
|
}
|
|
|
|
if (timeout > 0) {
|
|
err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
|
|
if (err < 0)
|
|
goto err_parse_key_end;
|
|
|
|
if (timeout != READ_ONCE(set->timeout)) {
|
|
err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
|
|
if (err < 0)
|
|
goto err_parse_key_end;
|
|
}
|
|
}
|
|
|
|
if (num_exprs) {
|
|
for (i = 0; i < num_exprs; i++)
|
|
size += expr_array[i]->ops->size;
|
|
|
|
err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
|
|
sizeof(struct nft_set_elem_expr) + size);
|
|
if (err < 0)
|
|
goto err_parse_key_end;
|
|
}
|
|
|
|
if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
|
|
obj = nft_obj_lookup(ctx->net, ctx->table,
|
|
nla[NFTA_SET_ELEM_OBJREF],
|
|
set->objtype, genmask);
|
|
if (IS_ERR(obj)) {
|
|
err = PTR_ERR(obj);
|
|
obj = NULL;
|
|
goto err_parse_key_end;
|
|
}
|
|
|
|
if (!nft_use_inc(&obj->use)) {
|
|
err = -EMFILE;
|
|
obj = NULL;
|
|
goto err_parse_key_end;
|
|
}
|
|
|
|
err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
|
|
if (err < 0)
|
|
goto err_parse_key_end;
|
|
}
|
|
|
|
if (nla[NFTA_SET_ELEM_DATA] != NULL) {
|
|
err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
|
|
nla[NFTA_SET_ELEM_DATA]);
|
|
if (err < 0)
|
|
goto err_parse_key_end;
|
|
|
|
dreg = nft_type_to_reg(set->dtype);
|
|
list_for_each_entry(binding, &set->bindings, list) {
|
|
struct nft_ctx bind_ctx = {
|
|
.net = ctx->net,
|
|
.family = ctx->family,
|
|
.table = ctx->table,
|
|
.chain = (struct nft_chain *)binding->chain,
|
|
};
|
|
|
|
if (!(binding->flags & NFT_SET_MAP))
|
|
continue;
|
|
|
|
err = nft_validate_register_store(&bind_ctx, dreg,
|
|
&elem.data.val,
|
|
desc.type, desc.len);
|
|
if (err < 0)
|
|
goto err_parse_data;
|
|
|
|
if (desc.type == NFT_DATA_VERDICT &&
|
|
(elem.data.val.verdict.code == NFT_GOTO ||
|
|
elem.data.val.verdict.code == NFT_JUMP))
|
|
nft_validate_state_update(ctx->table,
|
|
NFT_VALIDATE_NEED);
|
|
}
|
|
|
|
err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
|
|
if (err < 0)
|
|
goto err_parse_data;
|
|
}
|
|
|
|
/* The full maximum length of userdata can exceed the maximum
|
|
* offset value (U8_MAX) for following extensions, therefor it
|
|
* must be the last extension added.
|
|
*/
|
|
ulen = 0;
|
|
if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
|
|
ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
|
|
if (ulen > 0) {
|
|
err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
|
|
ulen);
|
|
if (err < 0)
|
|
goto err_parse_data;
|
|
}
|
|
}
|
|
|
|
elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
|
|
elem.key_end.val.data, elem.data.val.data,
|
|
timeout, expiration, GFP_KERNEL_ACCOUNT);
|
|
if (IS_ERR(elem.priv)) {
|
|
err = PTR_ERR(elem.priv);
|
|
goto err_parse_data;
|
|
}
|
|
|
|
ext = nft_set_elem_ext(set, elem.priv);
|
|
if (flags)
|
|
*nft_set_ext_flags(ext) = flags;
|
|
|
|
if (obj)
|
|
*nft_set_ext_obj(ext) = obj;
|
|
|
|
if (ulen > 0) {
|
|
if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
|
|
err = -EINVAL;
|
|
goto err_elem_free;
|
|
}
|
|
udata = nft_set_ext_userdata(ext);
|
|
udata->len = ulen - 1;
|
|
nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
|
|
}
|
|
err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
|
|
if (err < 0)
|
|
goto err_elem_free;
|
|
|
|
trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
|
|
if (trans == NULL) {
|
|
err = -ENOMEM;
|
|
goto err_elem_free;
|
|
}
|
|
|
|
ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
|
|
|
|
err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
|
|
if (err) {
|
|
if (err == -EEXIST) {
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
|
|
nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
|
|
nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
|
|
nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
|
|
goto err_element_clash;
|
|
if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
|
|
nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
|
|
memcmp(nft_set_ext_data(ext),
|
|
nft_set_ext_data(ext2), set->dlen) != 0) ||
|
|
(nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
|
|
nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
|
|
*nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
|
|
goto err_element_clash;
|
|
else if (!(nlmsg_flags & NLM_F_EXCL))
|
|
err = 0;
|
|
} else if (err == -ENOTEMPTY) {
|
|
/* ENOTEMPTY reports overlapping between this element
|
|
* and an existing one.
|
|
*/
|
|
err = -EEXIST;
|
|
}
|
|
goto err_element_clash;
|
|
}
|
|
|
|
if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
|
|
!atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
|
|
err = -ENFILE;
|
|
goto err_set_full;
|
|
}
|
|
|
|
nft_trans_elem(trans) = elem;
|
|
nft_trans_commit_list_add_tail(ctx->net, trans);
|
|
return 0;
|
|
|
|
err_set_full:
|
|
nft_setelem_remove(ctx->net, set, &elem);
|
|
err_element_clash:
|
|
kfree(trans);
|
|
err_elem_free:
|
|
nf_tables_set_elem_destroy(ctx, set, elem.priv);
|
|
err_parse_data:
|
|
if (nla[NFTA_SET_ELEM_DATA] != NULL)
|
|
nft_data_release(&elem.data.val, desc.type);
|
|
err_parse_key_end:
|
|
if (obj)
|
|
nft_use_dec_restore(&obj->use);
|
|
|
|
nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
|
|
err_parse_key:
|
|
nft_data_release(&elem.key.val, NFT_DATA_VALUE);
|
|
err_set_elem_expr:
|
|
for (i = 0; i < num_exprs && expr_array[i]; i++)
|
|
nft_expr_destroy(ctx, expr_array[i]);
|
|
err_set_elem_expr_clone:
|
|
return err;
|
|
}
|
|
|
|
static int nf_tables_newsetelem(struct sk_buff *skb,
|
|
const struct nfnl_info *info,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
struct netlink_ext_ack *extack = info->extack;
|
|
u8 genmask = nft_genmask_next(info->net);
|
|
u8 family = info->nfmsg->nfgen_family;
|
|
struct net *net = info->net;
|
|
const struct nlattr *attr;
|
|
struct nft_table *table;
|
|
struct nft_set *set;
|
|
struct nft_ctx ctx;
|
|
int rem, err;
|
|
|
|
if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
|
|
return -EINVAL;
|
|
|
|
table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
|
|
genmask, NETLINK_CB(skb).portid);
|
|
if (IS_ERR(table)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
|
|
return PTR_ERR(table);
|
|
}
|
|
|
|
set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
|
|
nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
|
|
if (IS_ERR(set))
|
|
return PTR_ERR(set);
|
|
|
|
if (!list_empty(&set->bindings) &&
|
|
(set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
|
|
return -EBUSY;
|
|
|
|
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
|
|
|
|
nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
|
|
err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
|
|
if (err < 0) {
|
|
NL_SET_BAD_ATTR(extack, attr);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
if (table->validate_state == NFT_VALIDATE_DO)
|
|
return nft_table_validate(net, table);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* nft_data_hold - hold a nft_data item
|
|
*
|
|
* @data: struct nft_data to release
|
|
* @type: type of data
|
|
*
|
|
* Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
|
|
* NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
|
|
* NFT_GOTO verdicts. This function must be called on active data objects
|
|
* from the second phase of the commit protocol.
|
|
*/
|
|
void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
|
|
{
|
|
struct nft_chain *chain;
|
|
|
|
if (type == NFT_DATA_VERDICT) {
|
|
switch (data->verdict.code) {
|
|
case NFT_JUMP:
|
|
case NFT_GOTO:
|
|
chain = data->verdict.chain;
|
|
nft_use_inc_restore(&chain->use);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void nft_setelem_data_activate(const struct net *net,
|
|
const struct nft_set *set,
|
|
struct nft_set_elem *elem)
|
|
{
|
|
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
|
|
nft_data_hold(nft_set_ext_data(ext), set->dtype);
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
|
|
nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
|
|
}
|
|
|
|
void nft_setelem_data_deactivate(const struct net *net,
|
|
const struct nft_set *set,
|
|
struct nft_set_elem *elem)
|
|
{
|
|
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
|
|
nft_data_release(nft_set_ext_data(ext), set->dtype);
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
|
|
nft_use_dec(&(*nft_set_ext_obj(ext))->use);
|
|
}
|
|
|
|
static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
|
|
const struct nlattr *attr)
|
|
{
|
|
struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
|
|
struct nft_set_ext_tmpl tmpl;
|
|
struct nft_set_elem elem;
|
|
struct nft_set_ext *ext;
|
|
struct nft_trans *trans;
|
|
u32 flags = 0;
|
|
int err;
|
|
|
|
err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
|
|
nft_set_elem_policy, NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
|
|
return -EINVAL;
|
|
|
|
if (!nft_setelem_valid_key_end(set, nla, flags))
|
|
return -EINVAL;
|
|
|
|
nft_set_ext_prepare(&tmpl);
|
|
|
|
if (flags != 0) {
|
|
err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
if (nla[NFTA_SET_ELEM_KEY]) {
|
|
err = nft_setelem_parse_key(ctx, set, &elem.key.val,
|
|
nla[NFTA_SET_ELEM_KEY]);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
|
|
if (err < 0)
|
|
goto fail_elem;
|
|
}
|
|
|
|
if (nla[NFTA_SET_ELEM_KEY_END]) {
|
|
err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
|
|
nla[NFTA_SET_ELEM_KEY_END]);
|
|
if (err < 0)
|
|
goto fail_elem;
|
|
|
|
err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
|
|
if (err < 0)
|
|
goto fail_elem_key_end;
|
|
}
|
|
|
|
err = -ENOMEM;
|
|
elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
|
|
elem.key_end.val.data, NULL, 0, 0,
|
|
GFP_KERNEL_ACCOUNT);
|
|
if (IS_ERR(elem.priv)) {
|
|
err = PTR_ERR(elem.priv);
|
|
goto fail_elem_key_end;
|
|
}
|
|
|
|
ext = nft_set_elem_ext(set, elem.priv);
|
|
if (flags)
|
|
*nft_set_ext_flags(ext) = flags;
|
|
|
|
trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
|
|
if (trans == NULL)
|
|
goto fail_trans;
|
|
|
|
err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
|
|
if (err < 0)
|
|
goto fail_ops;
|
|
|
|
nft_setelem_data_deactivate(ctx->net, set, &elem);
|
|
|
|
nft_trans_elem(trans) = elem;
|
|
nft_trans_commit_list_add_tail(ctx->net, trans);
|
|
return 0;
|
|
|
|
fail_ops:
|
|
kfree(trans);
|
|
fail_trans:
|
|
kfree(elem.priv);
|
|
fail_elem_key_end:
|
|
nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
|
|
fail_elem:
|
|
nft_data_release(&elem.key.val, NFT_DATA_VALUE);
|
|
return err;
|
|
}
|
|
|
|
static int nft_setelem_flush(const struct nft_ctx *ctx,
|
|
struct nft_set *set,
|
|
const struct nft_set_iter *iter,
|
|
struct nft_set_elem *elem)
|
|
{
|
|
struct nft_trans *trans;
|
|
int err;
|
|
|
|
trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
|
|
sizeof(struct nft_trans_elem), GFP_ATOMIC);
|
|
if (!trans)
|
|
return -ENOMEM;
|
|
|
|
if (!set->ops->flush(ctx->net, set, elem->priv)) {
|
|
err = -ENOENT;
|
|
goto err1;
|
|
}
|
|
set->ndeact++;
|
|
|
|
nft_setelem_data_deactivate(ctx->net, set, elem);
|
|
nft_trans_elem_set(trans) = set;
|
|
nft_trans_elem(trans) = *elem;
|
|
nft_trans_commit_list_add_tail(ctx->net, trans);
|
|
|
|
return 0;
|
|
err1:
|
|
kfree(trans);
|
|
return err;
|
|
}
|
|
|
|
static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
|
|
struct nft_set *set,
|
|
struct nft_set_elem *elem)
|
|
{
|
|
struct nft_trans *trans;
|
|
|
|
trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
|
|
sizeof(struct nft_trans_elem), GFP_KERNEL);
|
|
if (!trans)
|
|
return -ENOMEM;
|
|
|
|
nft_setelem_data_deactivate(ctx->net, set, elem);
|
|
nft_trans_elem_set(trans) = set;
|
|
nft_trans_elem(trans) = *elem;
|
|
nft_trans_commit_list_add_tail(ctx->net, trans);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nft_set_catchall_flush(const struct nft_ctx *ctx,
|
|
struct nft_set *set)
|
|
{
|
|
u8 genmask = nft_genmask_next(ctx->net);
|
|
struct nft_set_elem_catchall *catchall;
|
|
struct nft_set_elem elem;
|
|
struct nft_set_ext *ext;
|
|
int ret = 0;
|
|
|
|
list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
|
|
ext = nft_set_elem_ext(set, catchall->elem);
|
|
if (!nft_set_elem_active(ext, genmask))
|
|
continue;
|
|
|
|
elem.priv = catchall->elem;
|
|
ret = __nft_set_catchall_flush(ctx, set, &elem);
|
|
if (ret < 0)
|
|
break;
|
|
nft_set_elem_change_active(ctx->net, set, ext);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
|
|
{
|
|
struct nft_set_iter iter = {
|
|
.genmask = genmask,
|
|
.fn = nft_setelem_flush,
|
|
};
|
|
|
|
set->ops->walk(ctx, set, &iter);
|
|
if (!iter.err)
|
|
iter.err = nft_set_catchall_flush(ctx, set);
|
|
|
|
return iter.err;
|
|
}
|
|
|
|
static int nf_tables_delsetelem(struct sk_buff *skb,
|
|
const struct nfnl_info *info,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
struct netlink_ext_ack *extack = info->extack;
|
|
u8 genmask = nft_genmask_next(info->net);
|
|
u8 family = info->nfmsg->nfgen_family;
|
|
struct net *net = info->net;
|
|
const struct nlattr *attr;
|
|
struct nft_table *table;
|
|
struct nft_set *set;
|
|
struct nft_ctx ctx;
|
|
int rem, err = 0;
|
|
|
|
table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
|
|
genmask, NETLINK_CB(skb).portid);
|
|
if (IS_ERR(table)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
|
|
return PTR_ERR(table);
|
|
}
|
|
|
|
set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
|
|
if (IS_ERR(set))
|
|
return PTR_ERR(set);
|
|
|
|
if (!list_empty(&set->bindings) &&
|
|
(set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
|
|
return -EBUSY;
|
|
|
|
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
|
|
|
|
if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
|
|
return nft_set_flush(&ctx, set, genmask);
|
|
|
|
nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
|
|
err = nft_del_setelem(&ctx, set, attr);
|
|
if (err == -ENOENT &&
|
|
NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
|
|
continue;
|
|
|
|
if (err < 0) {
|
|
NL_SET_BAD_ATTR(extack, attr);
|
|
break;
|
|
}
|
|
}
|
|
return err;
|
|
}
|
|
|
|
void nft_set_gc_batch_release(struct rcu_head *rcu)
|
|
{
|
|
struct nft_set_gc_batch *gcb;
|
|
unsigned int i;
|
|
|
|
gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
|
|
for (i = 0; i < gcb->head.cnt; i++)
|
|
nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
|
|
kfree(gcb);
|
|
}
|
|
|
|
struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
|
|
gfp_t gfp)
|
|
{
|
|
struct nft_set_gc_batch *gcb;
|
|
|
|
gcb = kzalloc(sizeof(*gcb), gfp);
|
|
if (gcb == NULL)
|
|
return gcb;
|
|
gcb->head.set = set;
|
|
return gcb;
|
|
}
|
|
|
|
/*
|
|
* Stateful objects
|
|
*/
|
|
|
|
/**
|
|
* nft_register_obj- register nf_tables stateful object type
|
|
* @obj_type: object type
|
|
*
|
|
* Registers the object type for use with nf_tables. Returns zero on
|
|
* success or a negative errno code otherwise.
|
|
*/
|
|
int nft_register_obj(struct nft_object_type *obj_type)
|
|
{
|
|
if (obj_type->type == NFT_OBJECT_UNSPEC)
|
|
return -EINVAL;
|
|
|
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
|
list_add_rcu(&obj_type->list, &nf_tables_objects);
|
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_register_obj);
|
|
|
|
/**
|
|
* nft_unregister_obj - unregister nf_tables object type
|
|
* @obj_type: object type
|
|
*
|
|
* Unregisters the object type for use with nf_tables.
|
|
*/
|
|
void nft_unregister_obj(struct nft_object_type *obj_type)
|
|
{
|
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
|
list_del_rcu(&obj_type->list);
|
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_unregister_obj);
|
|
|
|
struct nft_object *nft_obj_lookup(const struct net *net,
|
|
const struct nft_table *table,
|
|
const struct nlattr *nla, u32 objtype,
|
|
u8 genmask)
|
|
{
|
|
struct nft_object_hash_key k = { .table = table };
|
|
char search[NFT_OBJ_MAXNAMELEN];
|
|
struct rhlist_head *tmp, *list;
|
|
struct nft_object *obj;
|
|
|
|
nla_strscpy(search, nla, sizeof(search));
|
|
k.name = search;
|
|
|
|
WARN_ON_ONCE(!rcu_read_lock_held() &&
|
|
!lockdep_commit_lock_is_held(net));
|
|
|
|
rcu_read_lock();
|
|
list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
|
|
if (!list)
|
|
goto out;
|
|
|
|
rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
|
|
if (objtype == obj->ops->type->type &&
|
|
nft_active_genmask(obj, genmask)) {
|
|
rcu_read_unlock();
|
|
return obj;
|
|
}
|
|
}
|
|
out:
|
|
rcu_read_unlock();
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_obj_lookup);
|
|
|
|
static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
|
|
const struct nlattr *nla,
|
|
u32 objtype, u8 genmask)
|
|
{
|
|
struct nft_object *obj;
|
|
|
|
list_for_each_entry(obj, &table->objects, list) {
|
|
if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
|
|
objtype == obj->ops->type->type &&
|
|
nft_active_genmask(obj, genmask))
|
|
return obj;
|
|
}
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
|
|
[NFTA_OBJ_TABLE] = { .type = NLA_STRING,
|
|
.len = NFT_TABLE_MAXNAMELEN - 1 },
|
|
[NFTA_OBJ_NAME] = { .type = NLA_STRING,
|
|
.len = NFT_OBJ_MAXNAMELEN - 1 },
|
|
[NFTA_OBJ_TYPE] = { .type = NLA_U32 },
|
|
[NFTA_OBJ_DATA] = { .type = NLA_NESTED },
|
|
[NFTA_OBJ_HANDLE] = { .type = NLA_U64},
|
|
[NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
|
|
.len = NFT_USERDATA_MAXLEN },
|
|
};
|
|
|
|
static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
|
|
const struct nft_object_type *type,
|
|
const struct nlattr *attr)
|
|
{
|
|
struct nlattr **tb;
|
|
const struct nft_object_ops *ops;
|
|
struct nft_object *obj;
|
|
int err = -ENOMEM;
|
|
|
|
tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
|
|
if (!tb)
|
|
goto err1;
|
|
|
|
if (attr) {
|
|
err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
|
|
type->policy, NULL);
|
|
if (err < 0)
|
|
goto err2;
|
|
} else {
|
|
memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
|
|
}
|
|
|
|
if (type->select_ops) {
|
|
ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
|
|
if (IS_ERR(ops)) {
|
|
err = PTR_ERR(ops);
|
|
goto err2;
|
|
}
|
|
} else {
|
|
ops = type->ops;
|
|
}
|
|
|
|
err = -ENOMEM;
|
|
obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
|
|
if (!obj)
|
|
goto err2;
|
|
|
|
err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
|
|
if (err < 0)
|
|
goto err3;
|
|
|
|
obj->ops = ops;
|
|
|
|
kfree(tb);
|
|
return obj;
|
|
err3:
|
|
kfree(obj);
|
|
err2:
|
|
kfree(tb);
|
|
err1:
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
|
|
struct nft_object *obj, bool reset)
|
|
{
|
|
struct nlattr *nest;
|
|
|
|
nest = nla_nest_start_noflag(skb, attr);
|
|
if (!nest)
|
|
goto nla_put_failure;
|
|
if (obj->ops->dump(skb, obj, reset) < 0)
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
|
|
{
|
|
const struct nft_object_type *type;
|
|
|
|
list_for_each_entry(type, &nf_tables_objects, list) {
|
|
if (objtype == type->type)
|
|
return type;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static const struct nft_object_type *
|
|
nft_obj_type_get(struct net *net, u32 objtype)
|
|
{
|
|
const struct nft_object_type *type;
|
|
|
|
type = __nft_obj_type_get(objtype);
|
|
if (type != NULL && try_module_get(type->owner))
|
|
return type;
|
|
|
|
lockdep_nfnl_nft_mutex_not_held();
|
|
#ifdef CONFIG_MODULES
|
|
if (type == NULL) {
|
|
if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
|
|
return ERR_PTR(-EAGAIN);
|
|
}
|
|
#endif
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
static int nf_tables_updobj(const struct nft_ctx *ctx,
|
|
const struct nft_object_type *type,
|
|
const struct nlattr *attr,
|
|
struct nft_object *obj)
|
|
{
|
|
struct nft_object *newobj;
|
|
struct nft_trans *trans;
|
|
int err = -ENOMEM;
|
|
|
|
if (!try_module_get(type->owner))
|
|
return -ENOENT;
|
|
|
|
trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
|
|
sizeof(struct nft_trans_obj));
|
|
if (!trans)
|
|
goto err_trans;
|
|
|
|
newobj = nft_obj_init(ctx, type, attr);
|
|
if (IS_ERR(newobj)) {
|
|
err = PTR_ERR(newobj);
|
|
goto err_free_trans;
|
|
}
|
|
|
|
nft_trans_obj(trans) = obj;
|
|
nft_trans_obj_update(trans) = true;
|
|
nft_trans_obj_newobj(trans) = newobj;
|
|
nft_trans_commit_list_add_tail(ctx->net, trans);
|
|
|
|
return 0;
|
|
|
|
err_free_trans:
|
|
kfree(trans);
|
|
err_trans:
|
|
module_put(type->owner);
|
|
return err;
|
|
}
|
|
|
|
static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
struct netlink_ext_ack *extack = info->extack;
|
|
u8 genmask = nft_genmask_next(info->net);
|
|
u8 family = info->nfmsg->nfgen_family;
|
|
const struct nft_object_type *type;
|
|
struct net *net = info->net;
|
|
struct nft_table *table;
|
|
struct nft_object *obj;
|
|
struct nft_ctx ctx;
|
|
u32 objtype;
|
|
int err;
|
|
|
|
if (!nla[NFTA_OBJ_TYPE] ||
|
|
!nla[NFTA_OBJ_NAME] ||
|
|
!nla[NFTA_OBJ_DATA])
|
|
return -EINVAL;
|
|
|
|
table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
|
|
NETLINK_CB(skb).portid);
|
|
if (IS_ERR(table)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
|
|
return PTR_ERR(table);
|
|
}
|
|
|
|
objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
|
|
obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
|
|
if (IS_ERR(obj)) {
|
|
err = PTR_ERR(obj);
|
|
if (err != -ENOENT) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
|
|
return err;
|
|
}
|
|
} else {
|
|
if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
|
|
return -EEXIST;
|
|
}
|
|
if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
|
|
return -EOPNOTSUPP;
|
|
|
|
type = __nft_obj_type_get(objtype);
|
|
if (WARN_ON_ONCE(!type))
|
|
return -ENOENT;
|
|
|
|
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
|
|
|
|
return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
|
|
}
|
|
|
|
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
|
|
|
|
if (!nft_use_inc(&table->use))
|
|
return -EMFILE;
|
|
|
|
type = nft_obj_type_get(net, objtype);
|
|
if (IS_ERR(type)) {
|
|
err = PTR_ERR(type);
|
|
goto err_type;
|
|
}
|
|
|
|
obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
|
|
if (IS_ERR(obj)) {
|
|
err = PTR_ERR(obj);
|
|
goto err_init;
|
|
}
|
|
obj->key.table = table;
|
|
obj->handle = nf_tables_alloc_handle(table);
|
|
|
|
obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
|
|
if (!obj->key.name) {
|
|
err = -ENOMEM;
|
|
goto err_strdup;
|
|
}
|
|
|
|
if (nla[NFTA_OBJ_USERDATA]) {
|
|
obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
|
|
if (obj->udata == NULL)
|
|
goto err_userdata;
|
|
|
|
obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
|
|
}
|
|
|
|
err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
|
|
if (err < 0)
|
|
goto err_trans;
|
|
|
|
err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
|
|
nft_objname_ht_params);
|
|
if (err < 0)
|
|
goto err_obj_ht;
|
|
|
|
list_add_tail_rcu(&obj->list, &table->objects);
|
|
|
|
return 0;
|
|
err_obj_ht:
|
|
/* queued in transaction log */
|
|
INIT_LIST_HEAD(&obj->list);
|
|
return err;
|
|
err_trans:
|
|
kfree(obj->udata);
|
|
err_userdata:
|
|
kfree(obj->key.name);
|
|
err_strdup:
|
|
if (obj->ops->destroy)
|
|
obj->ops->destroy(&ctx, obj);
|
|
kfree(obj);
|
|
err_init:
|
|
module_put(type->owner);
|
|
err_type:
|
|
nft_use_dec_restore(&table->use);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
|
|
u32 portid, u32 seq, int event, u32 flags,
|
|
int family, const struct nft_table *table,
|
|
struct nft_object *obj, bool reset)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
|
|
event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
|
|
nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
|
|
NFNETLINK_V0, nft_base_seq(net));
|
|
if (!nlh)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
|
|
nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
|
|
nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
|
|
NFTA_OBJ_PAD))
|
|
goto nla_put_failure;
|
|
|
|
if (event == NFT_MSG_DELOBJ) {
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
}
|
|
|
|
if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
|
|
nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
|
|
nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
|
|
goto nla_put_failure;
|
|
|
|
if (obj->udata &&
|
|
nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
|
|
goto nla_put_failure;
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, nlh);
|
|
return -1;
|
|
}
|
|
|
|
struct nft_obj_filter {
|
|
char *table;
|
|
u32 type;
|
|
};
|
|
|
|
static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
|
|
const struct nft_table *table;
|
|
unsigned int idx = 0, s_idx = cb->args[0];
|
|
struct nft_obj_filter *filter = cb->data;
|
|
struct net *net = sock_net(skb->sk);
|
|
int family = nfmsg->nfgen_family;
|
|
struct nftables_pernet *nft_net;
|
|
struct nft_object *obj;
|
|
bool reset = false;
|
|
|
|
if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
|
|
reset = true;
|
|
|
|
rcu_read_lock();
|
|
nft_net = nft_pernet(net);
|
|
cb->seq = READ_ONCE(nft_net->base_seq);
|
|
|
|
list_for_each_entry_rcu(table, &nft_net->tables, list) {
|
|
if (family != NFPROTO_UNSPEC && family != table->family)
|
|
continue;
|
|
|
|
list_for_each_entry_rcu(obj, &table->objects, list) {
|
|
if (!nft_is_active(net, obj))
|
|
goto cont;
|
|
if (idx < s_idx)
|
|
goto cont;
|
|
if (idx > s_idx)
|
|
memset(&cb->args[1], 0,
|
|
sizeof(cb->args) - sizeof(cb->args[0]));
|
|
if (filter && filter->table &&
|
|
strcmp(filter->table, table->name))
|
|
goto cont;
|
|
if (filter &&
|
|
filter->type != NFT_OBJECT_UNSPEC &&
|
|
obj->ops->type->type != filter->type)
|
|
goto cont;
|
|
if (reset) {
|
|
char *buf = kasprintf(GFP_ATOMIC,
|
|
"%s:%u",
|
|
table->name,
|
|
nft_net->base_seq);
|
|
|
|
audit_log_nfcfg(buf,
|
|
family,
|
|
obj->handle,
|
|
AUDIT_NFT_OP_OBJ_RESET,
|
|
GFP_ATOMIC);
|
|
kfree(buf);
|
|
}
|
|
|
|
if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq,
|
|
NFT_MSG_NEWOBJ,
|
|
NLM_F_MULTI | NLM_F_APPEND,
|
|
table->family, table,
|
|
obj, reset) < 0)
|
|
goto done;
|
|
|
|
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
|
|
cont:
|
|
idx++;
|
|
}
|
|
}
|
|
done:
|
|
rcu_read_unlock();
|
|
|
|
cb->args[0] = idx;
|
|
return skb->len;
|
|
}
|
|
|
|
static int nf_tables_dump_obj_start(struct netlink_callback *cb)
|
|
{
|
|
const struct nlattr * const *nla = cb->data;
|
|
struct nft_obj_filter *filter = NULL;
|
|
|
|
if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
|
|
filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
|
|
if (!filter)
|
|
return -ENOMEM;
|
|
|
|
if (nla[NFTA_OBJ_TABLE]) {
|
|
filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
|
|
if (!filter->table) {
|
|
kfree(filter);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
if (nla[NFTA_OBJ_TYPE])
|
|
filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
|
|
}
|
|
|
|
cb->data = filter;
|
|
return 0;
|
|
}
|
|
|
|
static int nf_tables_dump_obj_done(struct netlink_callback *cb)
|
|
{
|
|
struct nft_obj_filter *filter = cb->data;
|
|
|
|
if (filter) {
|
|
kfree(filter->table);
|
|
kfree(filter);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* called with rcu_read_lock held */
|
|
static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
struct netlink_ext_ack *extack = info->extack;
|
|
u8 genmask = nft_genmask_cur(info->net);
|
|
u8 family = info->nfmsg->nfgen_family;
|
|
const struct nft_table *table;
|
|
struct net *net = info->net;
|
|
struct nft_object *obj;
|
|
struct sk_buff *skb2;
|
|
bool reset = false;
|
|
u32 objtype;
|
|
int err;
|
|
|
|
if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
struct netlink_dump_control c = {
|
|
.start = nf_tables_dump_obj_start,
|
|
.dump = nf_tables_dump_obj,
|
|
.done = nf_tables_dump_obj_done,
|
|
.module = THIS_MODULE,
|
|
.data = (void *)nla,
|
|
};
|
|
|
|
return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
|
|
}
|
|
|
|
if (!nla[NFTA_OBJ_NAME] ||
|
|
!nla[NFTA_OBJ_TYPE])
|
|
return -EINVAL;
|
|
|
|
table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
|
|
if (IS_ERR(table)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
|
|
return PTR_ERR(table);
|
|
}
|
|
|
|
objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
|
|
obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
|
|
if (IS_ERR(obj)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
|
|
return PTR_ERR(obj);
|
|
}
|
|
|
|
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
|
|
if (!skb2)
|
|
return -ENOMEM;
|
|
|
|
if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
|
|
reset = true;
|
|
|
|
if (reset) {
|
|
const struct nftables_pernet *nft_net;
|
|
char *buf;
|
|
|
|
nft_net = nft_pernet(net);
|
|
buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
|
|
|
|
audit_log_nfcfg(buf,
|
|
family,
|
|
obj->handle,
|
|
AUDIT_NFT_OP_OBJ_RESET,
|
|
GFP_ATOMIC);
|
|
kfree(buf);
|
|
}
|
|
|
|
err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
|
|
info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
|
|
family, table, obj, reset);
|
|
if (err < 0)
|
|
goto err_fill_obj_info;
|
|
|
|
return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
|
|
|
|
err_fill_obj_info:
|
|
kfree_skb(skb2);
|
|
return err;
|
|
}
|
|
|
|
static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
|
|
{
|
|
if (obj->ops->destroy)
|
|
obj->ops->destroy(ctx, obj);
|
|
|
|
module_put(obj->ops->type->owner);
|
|
kfree(obj->key.name);
|
|
kfree(obj->udata);
|
|
kfree(obj);
|
|
}
|
|
|
|
static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
struct netlink_ext_ack *extack = info->extack;
|
|
u8 genmask = nft_genmask_next(info->net);
|
|
u8 family = info->nfmsg->nfgen_family;
|
|
struct net *net = info->net;
|
|
const struct nlattr *attr;
|
|
struct nft_table *table;
|
|
struct nft_object *obj;
|
|
struct nft_ctx ctx;
|
|
u32 objtype;
|
|
|
|
if (!nla[NFTA_OBJ_TYPE] ||
|
|
(!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
|
|
return -EINVAL;
|
|
|
|
table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
|
|
NETLINK_CB(skb).portid);
|
|
if (IS_ERR(table)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
|
|
return PTR_ERR(table);
|
|
}
|
|
|
|
objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
|
|
if (nla[NFTA_OBJ_HANDLE]) {
|
|
attr = nla[NFTA_OBJ_HANDLE];
|
|
obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
|
|
} else {
|
|
attr = nla[NFTA_OBJ_NAME];
|
|
obj = nft_obj_lookup(net, table, attr, objtype, genmask);
|
|
}
|
|
|
|
if (IS_ERR(obj)) {
|
|
if (PTR_ERR(obj) == -ENOENT &&
|
|
NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
|
|
return 0;
|
|
|
|
NL_SET_BAD_ATTR(extack, attr);
|
|
return PTR_ERR(obj);
|
|
}
|
|
if (obj->use > 0) {
|
|
NL_SET_BAD_ATTR(extack, attr);
|
|
return -EBUSY;
|
|
}
|
|
|
|
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
|
|
|
|
return nft_delobj(&ctx, obj);
|
|
}
|
|
|
|
void nft_obj_notify(struct net *net, const struct nft_table *table,
|
|
struct nft_object *obj, u32 portid, u32 seq, int event,
|
|
u16 flags, int family, int report, gfp_t gfp)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(net);
|
|
struct sk_buff *skb;
|
|
int err;
|
|
char *buf = kasprintf(gfp, "%s:%u",
|
|
table->name, nft_net->base_seq);
|
|
|
|
audit_log_nfcfg(buf,
|
|
family,
|
|
obj->handle,
|
|
event == NFT_MSG_NEWOBJ ?
|
|
AUDIT_NFT_OP_OBJ_REGISTER :
|
|
AUDIT_NFT_OP_OBJ_UNREGISTER,
|
|
gfp);
|
|
kfree(buf);
|
|
|
|
if (!report &&
|
|
!nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
|
|
return;
|
|
|
|
skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
|
|
if (skb == NULL)
|
|
goto err;
|
|
|
|
err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
|
|
flags & (NLM_F_CREATE | NLM_F_EXCL),
|
|
family, table, obj, false);
|
|
if (err < 0) {
|
|
kfree_skb(skb);
|
|
goto err;
|
|
}
|
|
|
|
nft_notify_enqueue(skb, report, &nft_net->notify_list);
|
|
return;
|
|
err:
|
|
nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_obj_notify);
|
|
|
|
static void nf_tables_obj_notify(const struct nft_ctx *ctx,
|
|
struct nft_object *obj, int event)
|
|
{
|
|
nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
|
|
ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
|
|
}
|
|
|
|
/*
|
|
* Flow tables
|
|
*/
|
|
void nft_register_flowtable_type(struct nf_flowtable_type *type)
|
|
{
|
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
|
list_add_tail_rcu(&type->list, &nf_tables_flowtables);
|
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
|
|
|
|
void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
|
|
{
|
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
|
list_del_rcu(&type->list);
|
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
|
|
|
|
static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
|
|
[NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
|
|
.len = NFT_NAME_MAXLEN - 1 },
|
|
[NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
|
|
.len = NFT_NAME_MAXLEN - 1 },
|
|
[NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
|
|
[NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
|
|
[NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
|
|
};
|
|
|
|
struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
|
|
const struct nlattr *nla, u8 genmask)
|
|
{
|
|
struct nft_flowtable *flowtable;
|
|
|
|
list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
|
|
if (!nla_strcmp(nla, flowtable->name) &&
|
|
nft_active_genmask(flowtable, genmask))
|
|
return flowtable;
|
|
}
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
|
|
|
|
void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
|
|
struct nft_flowtable *flowtable,
|
|
enum nft_trans_phase phase)
|
|
{
|
|
switch (phase) {
|
|
case NFT_TRANS_PREPARE_ERROR:
|
|
case NFT_TRANS_PREPARE:
|
|
case NFT_TRANS_ABORT:
|
|
case NFT_TRANS_RELEASE:
|
|
nft_use_dec(&flowtable->use);
|
|
fallthrough;
|
|
default:
|
|
return;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
|
|
|
|
static struct nft_flowtable *
|
|
nft_flowtable_lookup_byhandle(const struct nft_table *table,
|
|
const struct nlattr *nla, u8 genmask)
|
|
{
|
|
struct nft_flowtable *flowtable;
|
|
|
|
list_for_each_entry(flowtable, &table->flowtables, list) {
|
|
if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
|
|
nft_active_genmask(flowtable, genmask))
|
|
return flowtable;
|
|
}
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
struct nft_flowtable_hook {
|
|
u32 num;
|
|
int priority;
|
|
struct list_head list;
|
|
};
|
|
|
|
static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
|
|
[NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
|
|
[NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
|
|
[NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
|
|
};
|
|
|
|
static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
|
|
const struct nlattr * const nla[],
|
|
struct nft_flowtable_hook *flowtable_hook,
|
|
struct nft_flowtable *flowtable,
|
|
struct netlink_ext_ack *extack, bool add)
|
|
{
|
|
struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
|
|
struct nft_hook *hook;
|
|
int hooknum, priority;
|
|
int err;
|
|
|
|
INIT_LIST_HEAD(&flowtable_hook->list);
|
|
|
|
err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
|
|
nla[NFTA_FLOWTABLE_HOOK],
|
|
nft_flowtable_hook_policy, NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (add) {
|
|
if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
|
|
!tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
|
|
return -ENOENT;
|
|
}
|
|
|
|
hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
|
|
if (hooknum != NF_NETDEV_INGRESS)
|
|
return -EOPNOTSUPP;
|
|
|
|
priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
|
|
|
|
flowtable_hook->priority = priority;
|
|
flowtable_hook->num = hooknum;
|
|
} else {
|
|
if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
|
|
hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
|
|
if (hooknum != flowtable->hooknum)
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
|
|
priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
|
|
if (priority != flowtable->data.priority)
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
flowtable_hook->priority = flowtable->data.priority;
|
|
flowtable_hook->num = flowtable->hooknum;
|
|
}
|
|
|
|
if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
|
|
err = nf_tables_parse_netdev_hooks(ctx->net,
|
|
tb[NFTA_FLOWTABLE_HOOK_DEVS],
|
|
&flowtable_hook->list,
|
|
extack);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
list_for_each_entry(hook, &flowtable_hook->list, list) {
|
|
hook->ops.pf = NFPROTO_NETDEV;
|
|
hook->ops.hooknum = flowtable_hook->num;
|
|
hook->ops.priority = flowtable_hook->priority;
|
|
hook->ops.priv = &flowtable->data;
|
|
hook->ops.hook = flowtable->data.type->hook;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
|
|
{
|
|
const struct nf_flowtable_type *type;
|
|
|
|
list_for_each_entry(type, &nf_tables_flowtables, list) {
|
|
if (family == type->family)
|
|
return type;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static const struct nf_flowtable_type *
|
|
nft_flowtable_type_get(struct net *net, u8 family)
|
|
{
|
|
const struct nf_flowtable_type *type;
|
|
|
|
type = __nft_flowtable_type_get(family);
|
|
if (type != NULL && try_module_get(type->owner))
|
|
return type;
|
|
|
|
lockdep_nfnl_nft_mutex_not_held();
|
|
#ifdef CONFIG_MODULES
|
|
if (type == NULL) {
|
|
if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
|
|
return ERR_PTR(-EAGAIN);
|
|
}
|
|
#endif
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
/* Only called from error and netdev event paths. */
|
|
static void nft_unregister_flowtable_hook(struct net *net,
|
|
struct nft_flowtable *flowtable,
|
|
struct nft_hook *hook)
|
|
{
|
|
nf_unregister_net_hook(net, &hook->ops);
|
|
flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
|
|
FLOW_BLOCK_UNBIND);
|
|
}
|
|
|
|
static void __nft_unregister_flowtable_net_hooks(struct net *net,
|
|
struct list_head *hook_list,
|
|
bool release_netdev)
|
|
{
|
|
struct nft_hook *hook, *next;
|
|
|
|
list_for_each_entry_safe(hook, next, hook_list, list) {
|
|
nf_unregister_net_hook(net, &hook->ops);
|
|
if (release_netdev) {
|
|
list_del(&hook->list);
|
|
kfree_rcu(hook, rcu);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void nft_unregister_flowtable_net_hooks(struct net *net,
|
|
struct list_head *hook_list)
|
|
{
|
|
__nft_unregister_flowtable_net_hooks(net, hook_list, false);
|
|
}
|
|
|
|
static int nft_register_flowtable_net_hooks(struct net *net,
|
|
struct nft_table *table,
|
|
struct list_head *hook_list,
|
|
struct nft_flowtable *flowtable)
|
|
{
|
|
struct nft_hook *hook, *hook2, *next;
|
|
struct nft_flowtable *ft;
|
|
int err, i = 0;
|
|
|
|
list_for_each_entry(hook, hook_list, list) {
|
|
list_for_each_entry(ft, &table->flowtables, list) {
|
|
if (!nft_is_active_next(net, ft))
|
|
continue;
|
|
|
|
list_for_each_entry(hook2, &ft->hook_list, list) {
|
|
if (hook->ops.dev == hook2->ops.dev &&
|
|
hook->ops.pf == hook2->ops.pf) {
|
|
err = -EEXIST;
|
|
goto err_unregister_net_hooks;
|
|
}
|
|
}
|
|
}
|
|
|
|
err = flowtable->data.type->setup(&flowtable->data,
|
|
hook->ops.dev,
|
|
FLOW_BLOCK_BIND);
|
|
if (err < 0)
|
|
goto err_unregister_net_hooks;
|
|
|
|
err = nf_register_net_hook(net, &hook->ops);
|
|
if (err < 0) {
|
|
flowtable->data.type->setup(&flowtable->data,
|
|
hook->ops.dev,
|
|
FLOW_BLOCK_UNBIND);
|
|
goto err_unregister_net_hooks;
|
|
}
|
|
|
|
i++;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_unregister_net_hooks:
|
|
list_for_each_entry_safe(hook, next, hook_list, list) {
|
|
if (i-- <= 0)
|
|
break;
|
|
|
|
nft_unregister_flowtable_hook(net, flowtable, hook);
|
|
list_del_rcu(&hook->list);
|
|
kfree_rcu(hook, rcu);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static void nft_hooks_destroy(struct list_head *hook_list)
|
|
{
|
|
struct nft_hook *hook, *next;
|
|
|
|
list_for_each_entry_safe(hook, next, hook_list, list) {
|
|
list_del_rcu(&hook->list);
|
|
kfree_rcu(hook, rcu);
|
|
}
|
|
}
|
|
|
|
static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
|
|
struct nft_flowtable *flowtable,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
const struct nlattr * const *nla = ctx->nla;
|
|
struct nft_flowtable_hook flowtable_hook;
|
|
struct nft_hook *hook, *next;
|
|
struct nft_trans *trans;
|
|
bool unregister = false;
|
|
u32 flags;
|
|
int err;
|
|
|
|
err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
|
|
extack, false);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
|
|
if (nft_hook_list_find(&flowtable->hook_list, hook)) {
|
|
list_del(&hook->list);
|
|
kfree(hook);
|
|
}
|
|
}
|
|
|
|
if (nla[NFTA_FLOWTABLE_FLAGS]) {
|
|
flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
|
|
if (flags & ~NFT_FLOWTABLE_MASK) {
|
|
err = -EOPNOTSUPP;
|
|
goto err_flowtable_update_hook;
|
|
}
|
|
if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
|
|
(flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
|
|
err = -EOPNOTSUPP;
|
|
goto err_flowtable_update_hook;
|
|
}
|
|
} else {
|
|
flags = flowtable->data.flags;
|
|
}
|
|
|
|
err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
|
|
&flowtable_hook.list, flowtable);
|
|
if (err < 0)
|
|
goto err_flowtable_update_hook;
|
|
|
|
trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
|
|
sizeof(struct nft_trans_flowtable));
|
|
if (!trans) {
|
|
unregister = true;
|
|
err = -ENOMEM;
|
|
goto err_flowtable_update_hook;
|
|
}
|
|
|
|
nft_trans_flowtable_flags(trans) = flags;
|
|
nft_trans_flowtable(trans) = flowtable;
|
|
nft_trans_flowtable_update(trans) = true;
|
|
INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
|
|
list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
|
|
|
|
nft_trans_commit_list_add_tail(ctx->net, trans);
|
|
|
|
return 0;
|
|
|
|
err_flowtable_update_hook:
|
|
list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
|
|
if (unregister)
|
|
nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
|
|
list_del_rcu(&hook->list);
|
|
kfree_rcu(hook, rcu);
|
|
}
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
static int nf_tables_newflowtable(struct sk_buff *skb,
|
|
const struct nfnl_info *info,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
struct netlink_ext_ack *extack = info->extack;
|
|
struct nft_flowtable_hook flowtable_hook;
|
|
u8 genmask = nft_genmask_next(info->net);
|
|
u8 family = info->nfmsg->nfgen_family;
|
|
const struct nf_flowtable_type *type;
|
|
struct nft_flowtable *flowtable;
|
|
struct nft_hook *hook, *next;
|
|
struct net *net = info->net;
|
|
struct nft_table *table;
|
|
struct nft_ctx ctx;
|
|
int err;
|
|
|
|
if (!nla[NFTA_FLOWTABLE_TABLE] ||
|
|
!nla[NFTA_FLOWTABLE_NAME] ||
|
|
!nla[NFTA_FLOWTABLE_HOOK])
|
|
return -EINVAL;
|
|
|
|
table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
|
|
genmask, NETLINK_CB(skb).portid);
|
|
if (IS_ERR(table)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
|
|
return PTR_ERR(table);
|
|
}
|
|
|
|
flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
|
|
genmask);
|
|
if (IS_ERR(flowtable)) {
|
|
err = PTR_ERR(flowtable);
|
|
if (err != -ENOENT) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
|
|
return err;
|
|
}
|
|
} else {
|
|
if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
|
|
return -EEXIST;
|
|
}
|
|
|
|
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
|
|
|
|
return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
|
|
}
|
|
|
|
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
|
|
|
|
if (!nft_use_inc(&table->use))
|
|
return -EMFILE;
|
|
|
|
flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
|
|
if (!flowtable) {
|
|
err = -ENOMEM;
|
|
goto flowtable_alloc;
|
|
}
|
|
|
|
flowtable->table = table;
|
|
flowtable->handle = nf_tables_alloc_handle(table);
|
|
INIT_LIST_HEAD(&flowtable->hook_list);
|
|
|
|
flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
|
|
if (!flowtable->name) {
|
|
err = -ENOMEM;
|
|
goto err1;
|
|
}
|
|
|
|
type = nft_flowtable_type_get(net, family);
|
|
if (IS_ERR(type)) {
|
|
err = PTR_ERR(type);
|
|
goto err2;
|
|
}
|
|
|
|
if (nla[NFTA_FLOWTABLE_FLAGS]) {
|
|
flowtable->data.flags =
|
|
ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
|
|
if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
|
|
err = -EOPNOTSUPP;
|
|
goto err3;
|
|
}
|
|
}
|
|
|
|
write_pnet(&flowtable->data.net, net);
|
|
flowtable->data.type = type;
|
|
err = type->init(&flowtable->data);
|
|
if (err < 0)
|
|
goto err3;
|
|
|
|
err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
|
|
extack, true);
|
|
if (err < 0)
|
|
goto err4;
|
|
|
|
list_splice(&flowtable_hook.list, &flowtable->hook_list);
|
|
flowtable->data.priority = flowtable_hook.priority;
|
|
flowtable->hooknum = flowtable_hook.num;
|
|
|
|
err = nft_register_flowtable_net_hooks(ctx.net, table,
|
|
&flowtable->hook_list,
|
|
flowtable);
|
|
if (err < 0) {
|
|
nft_hooks_destroy(&flowtable->hook_list);
|
|
goto err4;
|
|
}
|
|
|
|
err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
|
|
if (err < 0)
|
|
goto err5;
|
|
|
|
list_add_tail_rcu(&flowtable->list, &table->flowtables);
|
|
|
|
return 0;
|
|
err5:
|
|
list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
|
|
nft_unregister_flowtable_hook(net, flowtable, hook);
|
|
list_del_rcu(&hook->list);
|
|
kfree_rcu(hook, rcu);
|
|
}
|
|
err4:
|
|
flowtable->data.type->free(&flowtable->data);
|
|
err3:
|
|
module_put(type->owner);
|
|
err2:
|
|
kfree(flowtable->name);
|
|
err1:
|
|
kfree(flowtable);
|
|
flowtable_alloc:
|
|
nft_use_dec_restore(&table->use);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
|
|
{
|
|
struct nft_hook *this, *next;
|
|
|
|
list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
|
|
list_del(&this->list);
|
|
kfree(this);
|
|
}
|
|
}
|
|
|
|
static int nft_delflowtable_hook(struct nft_ctx *ctx,
|
|
struct nft_flowtable *flowtable,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
const struct nlattr * const *nla = ctx->nla;
|
|
struct nft_flowtable_hook flowtable_hook;
|
|
LIST_HEAD(flowtable_del_list);
|
|
struct nft_hook *this, *hook;
|
|
struct nft_trans *trans;
|
|
int err;
|
|
|
|
err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
|
|
extack, false);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
list_for_each_entry(this, &flowtable_hook.list, list) {
|
|
hook = nft_hook_list_find(&flowtable->hook_list, this);
|
|
if (!hook) {
|
|
err = -ENOENT;
|
|
goto err_flowtable_del_hook;
|
|
}
|
|
list_move(&hook->list, &flowtable_del_list);
|
|
}
|
|
|
|
trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
|
|
sizeof(struct nft_trans_flowtable));
|
|
if (!trans) {
|
|
err = -ENOMEM;
|
|
goto err_flowtable_del_hook;
|
|
}
|
|
|
|
nft_trans_flowtable(trans) = flowtable;
|
|
nft_trans_flowtable_update(trans) = true;
|
|
INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
|
|
list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
|
|
nft_flowtable_hook_release(&flowtable_hook);
|
|
|
|
nft_trans_commit_list_add_tail(ctx->net, trans);
|
|
|
|
return 0;
|
|
|
|
err_flowtable_del_hook:
|
|
list_splice(&flowtable_del_list, &flowtable->hook_list);
|
|
nft_flowtable_hook_release(&flowtable_hook);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int nf_tables_delflowtable(struct sk_buff *skb,
|
|
const struct nfnl_info *info,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
struct netlink_ext_ack *extack = info->extack;
|
|
u8 genmask = nft_genmask_next(info->net);
|
|
u8 family = info->nfmsg->nfgen_family;
|
|
struct nft_flowtable *flowtable;
|
|
struct net *net = info->net;
|
|
const struct nlattr *attr;
|
|
struct nft_table *table;
|
|
struct nft_ctx ctx;
|
|
|
|
if (!nla[NFTA_FLOWTABLE_TABLE] ||
|
|
(!nla[NFTA_FLOWTABLE_NAME] &&
|
|
!nla[NFTA_FLOWTABLE_HANDLE]))
|
|
return -EINVAL;
|
|
|
|
table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
|
|
genmask, NETLINK_CB(skb).portid);
|
|
if (IS_ERR(table)) {
|
|
NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
|
|
return PTR_ERR(table);
|
|
}
|
|
|
|
if (nla[NFTA_FLOWTABLE_HANDLE]) {
|
|
attr = nla[NFTA_FLOWTABLE_HANDLE];
|
|
flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
|
|
} else {
|
|
attr = nla[NFTA_FLOWTABLE_NAME];
|
|
flowtable = nft_flowtable_lookup(table, attr, genmask);
|
|
}
|
|
|
|
if (IS_ERR(flowtable)) {
|
|
if (PTR_ERR(flowtable) == -ENOENT &&
|
|
NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
|
|
return 0;
|
|
|
|
NL_SET_BAD_ATTR(extack, attr);
|
|
return PTR_ERR(flowtable);
|
|
}
|
|
|
|
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
|
|
|
|
if (nla[NFTA_FLOWTABLE_HOOK])
|
|
return nft_delflowtable_hook(&ctx, flowtable, extack);
|
|
|
|
if (flowtable->use > 0) {
|
|
NL_SET_BAD_ATTR(extack, attr);
|
|
return -EBUSY;
|
|
}
|
|
|
|
return nft_delflowtable(&ctx, flowtable);
|
|
}
|
|
|
|
static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
|
|
u32 portid, u32 seq, int event,
|
|
u32 flags, int family,
|
|
struct nft_flowtable *flowtable,
|
|
struct list_head *hook_list)
|
|
{
|
|
struct nlattr *nest, *nest_devs;
|
|
struct nft_hook *hook;
|
|
struct nlmsghdr *nlh;
|
|
|
|
event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
|
|
nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
|
|
NFNETLINK_V0, nft_base_seq(net));
|
|
if (!nlh)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
|
|
nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
|
|
nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
|
|
NFTA_FLOWTABLE_PAD))
|
|
goto nla_put_failure;
|
|
|
|
if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
}
|
|
|
|
if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
|
|
nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
|
|
goto nla_put_failure;
|
|
|
|
nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
|
|
if (!nest)
|
|
goto nla_put_failure;
|
|
if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
|
|
nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
|
|
goto nla_put_failure;
|
|
|
|
nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
|
|
if (!nest_devs)
|
|
goto nla_put_failure;
|
|
|
|
if (!hook_list)
|
|
hook_list = &flowtable->hook_list;
|
|
|
|
list_for_each_entry_rcu(hook, hook_list, list) {
|
|
if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
|
|
goto nla_put_failure;
|
|
}
|
|
nla_nest_end(skb, nest_devs);
|
|
nla_nest_end(skb, nest);
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, nlh);
|
|
return -1;
|
|
}
|
|
|
|
struct nft_flowtable_filter {
|
|
char *table;
|
|
};
|
|
|
|
static int nf_tables_dump_flowtable(struct sk_buff *skb,
|
|
struct netlink_callback *cb)
|
|
{
|
|
const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
|
|
struct nft_flowtable_filter *filter = cb->data;
|
|
unsigned int idx = 0, s_idx = cb->args[0];
|
|
struct net *net = sock_net(skb->sk);
|
|
int family = nfmsg->nfgen_family;
|
|
struct nft_flowtable *flowtable;
|
|
struct nftables_pernet *nft_net;
|
|
const struct nft_table *table;
|
|
|
|
rcu_read_lock();
|
|
nft_net = nft_pernet(net);
|
|
cb->seq = READ_ONCE(nft_net->base_seq);
|
|
|
|
list_for_each_entry_rcu(table, &nft_net->tables, list) {
|
|
if (family != NFPROTO_UNSPEC && family != table->family)
|
|
continue;
|
|
|
|
list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
|
|
if (!nft_is_active(net, flowtable))
|
|
goto cont;
|
|
if (idx < s_idx)
|
|
goto cont;
|
|
if (idx > s_idx)
|
|
memset(&cb->args[1], 0,
|
|
sizeof(cb->args) - sizeof(cb->args[0]));
|
|
if (filter && filter->table &&
|
|
strcmp(filter->table, table->name))
|
|
goto cont;
|
|
|
|
if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq,
|
|
NFT_MSG_NEWFLOWTABLE,
|
|
NLM_F_MULTI | NLM_F_APPEND,
|
|
table->family,
|
|
flowtable, NULL) < 0)
|
|
goto done;
|
|
|
|
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
|
|
cont:
|
|
idx++;
|
|
}
|
|
}
|
|
done:
|
|
rcu_read_unlock();
|
|
|
|
cb->args[0] = idx;
|
|
return skb->len;
|
|
}
|
|
|
|
static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
|
|
{
|
|
const struct nlattr * const *nla = cb->data;
|
|
struct nft_flowtable_filter *filter = NULL;
|
|
|
|
if (nla[NFTA_FLOWTABLE_TABLE]) {
|
|
filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
|
|
if (!filter)
|
|
return -ENOMEM;
|
|
|
|
filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
|
|
GFP_ATOMIC);
|
|
if (!filter->table) {
|
|
kfree(filter);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
cb->data = filter;
|
|
return 0;
|
|
}
|
|
|
|
static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
|
|
{
|
|
struct nft_flowtable_filter *filter = cb->data;
|
|
|
|
if (!filter)
|
|
return 0;
|
|
|
|
kfree(filter->table);
|
|
kfree(filter);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* called with rcu_read_lock held */
|
|
static int nf_tables_getflowtable(struct sk_buff *skb,
|
|
const struct nfnl_info *info,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
u8 genmask = nft_genmask_cur(info->net);
|
|
u8 family = info->nfmsg->nfgen_family;
|
|
struct nft_flowtable *flowtable;
|
|
const struct nft_table *table;
|
|
struct net *net = info->net;
|
|
struct sk_buff *skb2;
|
|
int err;
|
|
|
|
if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
struct netlink_dump_control c = {
|
|
.start = nf_tables_dump_flowtable_start,
|
|
.dump = nf_tables_dump_flowtable,
|
|
.done = nf_tables_dump_flowtable_done,
|
|
.module = THIS_MODULE,
|
|
.data = (void *)nla,
|
|
};
|
|
|
|
return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
|
|
}
|
|
|
|
if (!nla[NFTA_FLOWTABLE_NAME])
|
|
return -EINVAL;
|
|
|
|
table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
|
|
genmask, 0);
|
|
if (IS_ERR(table))
|
|
return PTR_ERR(table);
|
|
|
|
flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
|
|
genmask);
|
|
if (IS_ERR(flowtable))
|
|
return PTR_ERR(flowtable);
|
|
|
|
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
|
|
if (!skb2)
|
|
return -ENOMEM;
|
|
|
|
err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
|
|
info->nlh->nlmsg_seq,
|
|
NFT_MSG_NEWFLOWTABLE, 0, family,
|
|
flowtable, NULL);
|
|
if (err < 0)
|
|
goto err_fill_flowtable_info;
|
|
|
|
return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
|
|
|
|
err_fill_flowtable_info:
|
|
kfree_skb(skb2);
|
|
return err;
|
|
}
|
|
|
|
static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
|
|
struct nft_flowtable *flowtable,
|
|
struct list_head *hook_list, int event)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(ctx->net);
|
|
struct sk_buff *skb;
|
|
u16 flags = 0;
|
|
int err;
|
|
|
|
if (!ctx->report &&
|
|
!nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
|
|
return;
|
|
|
|
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (skb == NULL)
|
|
goto err;
|
|
|
|
if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
|
|
flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
|
|
|
|
err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
|
|
ctx->seq, event, flags,
|
|
ctx->family, flowtable, hook_list);
|
|
if (err < 0) {
|
|
kfree_skb(skb);
|
|
goto err;
|
|
}
|
|
|
|
nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
|
|
return;
|
|
err:
|
|
nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
|
|
}
|
|
|
|
static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
|
|
{
|
|
struct nft_hook *hook, *next;
|
|
|
|
flowtable->data.type->free(&flowtable->data);
|
|
list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
|
|
flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
|
|
FLOW_BLOCK_UNBIND);
|
|
list_del_rcu(&hook->list);
|
|
kfree(hook);
|
|
}
|
|
kfree(flowtable->name);
|
|
module_put(flowtable->data.type->owner);
|
|
kfree(flowtable);
|
|
}
|
|
|
|
static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
|
|
u32 portid, u32 seq)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(net);
|
|
struct nlmsghdr *nlh;
|
|
char buf[TASK_COMM_LEN];
|
|
int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
|
|
|
|
nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
|
|
NFNETLINK_V0, nft_base_seq(net));
|
|
if (!nlh)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
|
|
nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
|
|
nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
|
|
goto nla_put_failure;
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, nlh);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static void nft_flowtable_event(unsigned long event, struct net_device *dev,
|
|
struct nft_flowtable *flowtable)
|
|
{
|
|
struct nft_hook *hook;
|
|
|
|
list_for_each_entry(hook, &flowtable->hook_list, list) {
|
|
if (hook->ops.dev != dev)
|
|
continue;
|
|
|
|
/* flow_offload_netdev_event() cleans up entries for us. */
|
|
nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
|
|
list_del_rcu(&hook->list);
|
|
kfree_rcu(hook, rcu);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int nf_tables_flowtable_event(struct notifier_block *this,
|
|
unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
struct nft_flowtable *flowtable;
|
|
struct nftables_pernet *nft_net;
|
|
struct nft_table *table;
|
|
struct net *net;
|
|
|
|
if (event != NETDEV_UNREGISTER)
|
|
return 0;
|
|
|
|
net = dev_net(dev);
|
|
nft_net = nft_pernet(net);
|
|
mutex_lock(&nft_net->commit_mutex);
|
|
list_for_each_entry(table, &nft_net->tables, list) {
|
|
list_for_each_entry(flowtable, &table->flowtables, list) {
|
|
nft_flowtable_event(event, dev, flowtable);
|
|
}
|
|
}
|
|
mutex_unlock(&nft_net->commit_mutex);
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block nf_tables_flowtable_notifier = {
|
|
.notifier_call = nf_tables_flowtable_event,
|
|
};
|
|
|
|
static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
|
|
int event)
|
|
{
|
|
struct nlmsghdr *nlh = nlmsg_hdr(skb);
|
|
struct sk_buff *skb2;
|
|
int err;
|
|
|
|
if (!nlmsg_report(nlh) &&
|
|
!nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
|
|
return;
|
|
|
|
skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (skb2 == NULL)
|
|
goto err;
|
|
|
|
err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
|
|
nlh->nlmsg_seq);
|
|
if (err < 0) {
|
|
kfree_skb(skb2);
|
|
goto err;
|
|
}
|
|
|
|
nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
|
|
nlmsg_report(nlh), GFP_KERNEL);
|
|
return;
|
|
err:
|
|
nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
|
|
-ENOBUFS);
|
|
}
|
|
|
|
static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
|
|
const struct nlattr * const nla[])
|
|
{
|
|
struct sk_buff *skb2;
|
|
int err;
|
|
|
|
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
|
|
if (skb2 == NULL)
|
|
return -ENOMEM;
|
|
|
|
err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
|
|
info->nlh->nlmsg_seq);
|
|
if (err < 0)
|
|
goto err_fill_gen_info;
|
|
|
|
return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
|
|
|
|
err_fill_gen_info:
|
|
kfree_skb(skb2);
|
|
return err;
|
|
}
|
|
|
|
static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
|
|
[NFT_MSG_NEWTABLE] = {
|
|
.call = nf_tables_newtable,
|
|
.type = NFNL_CB_BATCH,
|
|
.attr_count = NFTA_TABLE_MAX,
|
|
.policy = nft_table_policy,
|
|
},
|
|
[NFT_MSG_GETTABLE] = {
|
|
.call = nf_tables_gettable,
|
|
.type = NFNL_CB_RCU,
|
|
.attr_count = NFTA_TABLE_MAX,
|
|
.policy = nft_table_policy,
|
|
},
|
|
[NFT_MSG_DELTABLE] = {
|
|
.call = nf_tables_deltable,
|
|
.type = NFNL_CB_BATCH,
|
|
.attr_count = NFTA_TABLE_MAX,
|
|
.policy = nft_table_policy,
|
|
},
|
|
[NFT_MSG_DESTROYTABLE] = {
|
|
.call = nf_tables_deltable,
|
|
.type = NFNL_CB_BATCH,
|
|
.attr_count = NFTA_TABLE_MAX,
|
|
.policy = nft_table_policy,
|
|
},
|
|
[NFT_MSG_NEWCHAIN] = {
|
|
.call = nf_tables_newchain,
|
|
.type = NFNL_CB_BATCH,
|
|
.attr_count = NFTA_CHAIN_MAX,
|
|
.policy = nft_chain_policy,
|
|
},
|
|
[NFT_MSG_GETCHAIN] = {
|
|
.call = nf_tables_getchain,
|
|
.type = NFNL_CB_RCU,
|
|
.attr_count = NFTA_CHAIN_MAX,
|
|
.policy = nft_chain_policy,
|
|
},
|
|
[NFT_MSG_DELCHAIN] = {
|
|
.call = nf_tables_delchain,
|
|
.type = NFNL_CB_BATCH,
|
|
.attr_count = NFTA_CHAIN_MAX,
|
|
.policy = nft_chain_policy,
|
|
},
|
|
[NFT_MSG_DESTROYCHAIN] = {
|
|
.call = nf_tables_delchain,
|
|
.type = NFNL_CB_BATCH,
|
|
.attr_count = NFTA_CHAIN_MAX,
|
|
.policy = nft_chain_policy,
|
|
},
|
|
[NFT_MSG_NEWRULE] = {
|
|
.call = nf_tables_newrule,
|
|
.type = NFNL_CB_BATCH,
|
|
.attr_count = NFTA_RULE_MAX,
|
|
.policy = nft_rule_policy,
|
|
},
|
|
[NFT_MSG_GETRULE] = {
|
|
.call = nf_tables_getrule,
|
|
.type = NFNL_CB_RCU,
|
|
.attr_count = NFTA_RULE_MAX,
|
|
.policy = nft_rule_policy,
|
|
},
|
|
[NFT_MSG_GETRULE_RESET] = {
|
|
.call = nf_tables_getrule,
|
|
.type = NFNL_CB_RCU,
|
|
.attr_count = NFTA_RULE_MAX,
|
|
.policy = nft_rule_policy,
|
|
},
|
|
[NFT_MSG_DELRULE] = {
|
|
.call = nf_tables_delrule,
|
|
.type = NFNL_CB_BATCH,
|
|
.attr_count = NFTA_RULE_MAX,
|
|
.policy = nft_rule_policy,
|
|
},
|
|
[NFT_MSG_DESTROYRULE] = {
|
|
.call = nf_tables_delrule,
|
|
.type = NFNL_CB_BATCH,
|
|
.attr_count = NFTA_RULE_MAX,
|
|
.policy = nft_rule_policy,
|
|
},
|
|
[NFT_MSG_NEWSET] = {
|
|
.call = nf_tables_newset,
|
|
.type = NFNL_CB_BATCH,
|
|
.attr_count = NFTA_SET_MAX,
|
|
.policy = nft_set_policy,
|
|
},
|
|
[NFT_MSG_GETSET] = {
|
|
.call = nf_tables_getset,
|
|
.type = NFNL_CB_RCU,
|
|
.attr_count = NFTA_SET_MAX,
|
|
.policy = nft_set_policy,
|
|
},
|
|
[NFT_MSG_DELSET] = {
|
|
.call = nf_tables_delset,
|
|
.type = NFNL_CB_BATCH,
|
|
.attr_count = NFTA_SET_MAX,
|
|
.policy = nft_set_policy,
|
|
},
|
|
[NFT_MSG_DESTROYSET] = {
|
|
.call = nf_tables_delset,
|
|
.type = NFNL_CB_BATCH,
|
|
.attr_count = NFTA_SET_MAX,
|
|
.policy = nft_set_policy,
|
|
},
|
|
[NFT_MSG_NEWSETELEM] = {
|
|
.call = nf_tables_newsetelem,
|
|
.type = NFNL_CB_BATCH,
|
|
.attr_count = NFTA_SET_ELEM_LIST_MAX,
|
|
.policy = nft_set_elem_list_policy,
|
|
},
|
|
[NFT_MSG_GETSETELEM] = {
|
|
.call = nf_tables_getsetelem,
|
|
.type = NFNL_CB_RCU,
|
|
.attr_count = NFTA_SET_ELEM_LIST_MAX,
|
|
.policy = nft_set_elem_list_policy,
|
|
},
|
|
[NFT_MSG_DELSETELEM] = {
|
|
.call = nf_tables_delsetelem,
|
|
.type = NFNL_CB_BATCH,
|
|
.attr_count = NFTA_SET_ELEM_LIST_MAX,
|
|
.policy = nft_set_elem_list_policy,
|
|
},
|
|
[NFT_MSG_DESTROYSETELEM] = {
|
|
.call = nf_tables_delsetelem,
|
|
.type = NFNL_CB_BATCH,
|
|
.attr_count = NFTA_SET_ELEM_LIST_MAX,
|
|
.policy = nft_set_elem_list_policy,
|
|
},
|
|
[NFT_MSG_GETGEN] = {
|
|
.call = nf_tables_getgen,
|
|
.type = NFNL_CB_RCU,
|
|
},
|
|
[NFT_MSG_NEWOBJ] = {
|
|
.call = nf_tables_newobj,
|
|
.type = NFNL_CB_BATCH,
|
|
.attr_count = NFTA_OBJ_MAX,
|
|
.policy = nft_obj_policy,
|
|
},
|
|
[NFT_MSG_GETOBJ] = {
|
|
.call = nf_tables_getobj,
|
|
.type = NFNL_CB_RCU,
|
|
.attr_count = NFTA_OBJ_MAX,
|
|
.policy = nft_obj_policy,
|
|
},
|
|
[NFT_MSG_DELOBJ] = {
|
|
.call = nf_tables_delobj,
|
|
.type = NFNL_CB_BATCH,
|
|
.attr_count = NFTA_OBJ_MAX,
|
|
.policy = nft_obj_policy,
|
|
},
|
|
[NFT_MSG_DESTROYOBJ] = {
|
|
.call = nf_tables_delobj,
|
|
.type = NFNL_CB_BATCH,
|
|
.attr_count = NFTA_OBJ_MAX,
|
|
.policy = nft_obj_policy,
|
|
},
|
|
[NFT_MSG_GETOBJ_RESET] = {
|
|
.call = nf_tables_getobj,
|
|
.type = NFNL_CB_RCU,
|
|
.attr_count = NFTA_OBJ_MAX,
|
|
.policy = nft_obj_policy,
|
|
},
|
|
[NFT_MSG_NEWFLOWTABLE] = {
|
|
.call = nf_tables_newflowtable,
|
|
.type = NFNL_CB_BATCH,
|
|
.attr_count = NFTA_FLOWTABLE_MAX,
|
|
.policy = nft_flowtable_policy,
|
|
},
|
|
[NFT_MSG_GETFLOWTABLE] = {
|
|
.call = nf_tables_getflowtable,
|
|
.type = NFNL_CB_RCU,
|
|
.attr_count = NFTA_FLOWTABLE_MAX,
|
|
.policy = nft_flowtable_policy,
|
|
},
|
|
[NFT_MSG_DELFLOWTABLE] = {
|
|
.call = nf_tables_delflowtable,
|
|
.type = NFNL_CB_BATCH,
|
|
.attr_count = NFTA_FLOWTABLE_MAX,
|
|
.policy = nft_flowtable_policy,
|
|
},
|
|
[NFT_MSG_DESTROYFLOWTABLE] = {
|
|
.call = nf_tables_delflowtable,
|
|
.type = NFNL_CB_BATCH,
|
|
.attr_count = NFTA_FLOWTABLE_MAX,
|
|
.policy = nft_flowtable_policy,
|
|
},
|
|
};
|
|
|
|
static int nf_tables_validate(struct net *net)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(net);
|
|
struct nft_table *table;
|
|
|
|
list_for_each_entry(table, &nft_net->tables, list) {
|
|
switch (table->validate_state) {
|
|
case NFT_VALIDATE_SKIP:
|
|
continue;
|
|
case NFT_VALIDATE_NEED:
|
|
nft_validate_state_update(table, NFT_VALIDATE_DO);
|
|
fallthrough;
|
|
case NFT_VALIDATE_DO:
|
|
if (nft_table_validate(net, table) < 0)
|
|
return -EAGAIN;
|
|
|
|
nft_validate_state_update(table, NFT_VALIDATE_SKIP);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* a drop policy has to be deferred until all rules have been activated,
|
|
* otherwise a large ruleset that contains a drop-policy base chain will
|
|
* cause all packets to get dropped until the full transaction has been
|
|
* processed.
|
|
*
|
|
* We defer the drop policy until the transaction has been finalized.
|
|
*/
|
|
static void nft_chain_commit_drop_policy(struct nft_trans *trans)
|
|
{
|
|
struct nft_base_chain *basechain;
|
|
|
|
if (nft_trans_chain_policy(trans) != NF_DROP)
|
|
return;
|
|
|
|
if (!nft_is_base_chain(trans->ctx.chain))
|
|
return;
|
|
|
|
basechain = nft_base_chain(trans->ctx.chain);
|
|
basechain->policy = NF_DROP;
|
|
}
|
|
|
|
static void nft_chain_commit_update(struct nft_trans *trans)
|
|
{
|
|
struct nft_base_chain *basechain;
|
|
|
|
if (nft_trans_chain_name(trans)) {
|
|
rhltable_remove(&trans->ctx.table->chains_ht,
|
|
&trans->ctx.chain->rhlhead,
|
|
nft_chain_ht_params);
|
|
swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
|
|
rhltable_insert_key(&trans->ctx.table->chains_ht,
|
|
trans->ctx.chain->name,
|
|
&trans->ctx.chain->rhlhead,
|
|
nft_chain_ht_params);
|
|
}
|
|
|
|
if (!nft_is_base_chain(trans->ctx.chain))
|
|
return;
|
|
|
|
nft_chain_stats_replace(trans);
|
|
|
|
basechain = nft_base_chain(trans->ctx.chain);
|
|
|
|
switch (nft_trans_chain_policy(trans)) {
|
|
case NF_DROP:
|
|
case NF_ACCEPT:
|
|
basechain->policy = nft_trans_chain_policy(trans);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void nft_obj_commit_update(struct nft_trans *trans)
|
|
{
|
|
struct nft_object *newobj;
|
|
struct nft_object *obj;
|
|
|
|
obj = nft_trans_obj(trans);
|
|
newobj = nft_trans_obj_newobj(trans);
|
|
|
|
if (obj->ops->update)
|
|
obj->ops->update(obj, newobj);
|
|
|
|
nft_obj_destroy(&trans->ctx, newobj);
|
|
}
|
|
|
|
static void nft_commit_release(struct nft_trans *trans)
|
|
{
|
|
switch (trans->msg_type) {
|
|
case NFT_MSG_DELTABLE:
|
|
case NFT_MSG_DESTROYTABLE:
|
|
nf_tables_table_destroy(&trans->ctx);
|
|
break;
|
|
case NFT_MSG_NEWCHAIN:
|
|
free_percpu(nft_trans_chain_stats(trans));
|
|
kfree(nft_trans_chain_name(trans));
|
|
break;
|
|
case NFT_MSG_DELCHAIN:
|
|
case NFT_MSG_DESTROYCHAIN:
|
|
if (nft_trans_chain_update(trans))
|
|
nft_hooks_destroy(&nft_trans_chain_hooks(trans));
|
|
else
|
|
nf_tables_chain_destroy(&trans->ctx);
|
|
break;
|
|
case NFT_MSG_DELRULE:
|
|
case NFT_MSG_DESTROYRULE:
|
|
nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
|
|
break;
|
|
case NFT_MSG_DELSET:
|
|
case NFT_MSG_DESTROYSET:
|
|
nft_set_destroy(&trans->ctx, nft_trans_set(trans));
|
|
break;
|
|
case NFT_MSG_DELSETELEM:
|
|
case NFT_MSG_DESTROYSETELEM:
|
|
nf_tables_set_elem_destroy(&trans->ctx,
|
|
nft_trans_elem_set(trans),
|
|
nft_trans_elem(trans).priv);
|
|
break;
|
|
case NFT_MSG_DELOBJ:
|
|
case NFT_MSG_DESTROYOBJ:
|
|
nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
|
|
break;
|
|
case NFT_MSG_DELFLOWTABLE:
|
|
case NFT_MSG_DESTROYFLOWTABLE:
|
|
if (nft_trans_flowtable_update(trans))
|
|
nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
|
|
else
|
|
nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
|
|
break;
|
|
}
|
|
|
|
if (trans->put_net)
|
|
put_net(trans->ctx.net);
|
|
|
|
kfree(trans);
|
|
}
|
|
|
|
static void nf_tables_trans_destroy_work(struct work_struct *w)
|
|
{
|
|
struct nft_trans *trans, *next;
|
|
LIST_HEAD(head);
|
|
|
|
spin_lock(&nf_tables_destroy_list_lock);
|
|
list_splice_init(&nf_tables_destroy_list, &head);
|
|
spin_unlock(&nf_tables_destroy_list_lock);
|
|
|
|
if (list_empty(&head))
|
|
return;
|
|
|
|
synchronize_rcu();
|
|
|
|
list_for_each_entry_safe(trans, next, &head, list) {
|
|
nft_trans_list_del(trans);
|
|
nft_commit_release(trans);
|
|
}
|
|
}
|
|
|
|
void nf_tables_trans_destroy_flush_work(void)
|
|
{
|
|
flush_work(&trans_destroy_work);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
|
|
|
|
static bool nft_expr_reduce(struct nft_regs_track *track,
|
|
const struct nft_expr *expr)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
|
|
{
|
|
const struct nft_expr *expr, *last;
|
|
struct nft_regs_track track = {};
|
|
unsigned int size, data_size;
|
|
void *data, *data_boundary;
|
|
struct nft_rule_dp *prule;
|
|
struct nft_rule *rule;
|
|
|
|
/* already handled or inactive chain? */
|
|
if (chain->blob_next || !nft_is_active_next(net, chain))
|
|
return 0;
|
|
|
|
data_size = 0;
|
|
list_for_each_entry(rule, &chain->rules, list) {
|
|
if (nft_is_active_next(net, rule)) {
|
|
data_size += sizeof(*prule) + rule->dlen;
|
|
if (data_size > INT_MAX)
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
|
|
if (!chain->blob_next)
|
|
return -ENOMEM;
|
|
|
|
data = (void *)chain->blob_next->data;
|
|
data_boundary = data + data_size;
|
|
size = 0;
|
|
|
|
list_for_each_entry(rule, &chain->rules, list) {
|
|
if (!nft_is_active_next(net, rule))
|
|
continue;
|
|
|
|
prule = (struct nft_rule_dp *)data;
|
|
data += offsetof(struct nft_rule_dp, data);
|
|
if (WARN_ON_ONCE(data > data_boundary))
|
|
return -ENOMEM;
|
|
|
|
size = 0;
|
|
track.last = nft_expr_last(rule);
|
|
nft_rule_for_each_expr(expr, last, rule) {
|
|
track.cur = expr;
|
|
|
|
if (nft_expr_reduce(&track, expr)) {
|
|
expr = track.cur;
|
|
continue;
|
|
}
|
|
|
|
if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
|
|
return -ENOMEM;
|
|
|
|
memcpy(data + size, expr, expr->ops->size);
|
|
size += expr->ops->size;
|
|
}
|
|
if (WARN_ON_ONCE(size >= 1 << 12))
|
|
return -ENOMEM;
|
|
|
|
prule->handle = rule->handle;
|
|
prule->dlen = size;
|
|
prule->is_last = 0;
|
|
|
|
data += size;
|
|
size = 0;
|
|
chain->blob_next->size += (unsigned long)(data - (void *)prule);
|
|
}
|
|
|
|
if (WARN_ON_ONCE(data > data_boundary))
|
|
return -ENOMEM;
|
|
|
|
prule = (struct nft_rule_dp *)data;
|
|
nft_last_rule(chain, prule);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void nf_tables_commit_chain_prepare_cancel(struct net *net)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(net);
|
|
struct nft_trans *trans, *next;
|
|
|
|
list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
|
|
struct nft_chain *chain = trans->ctx.chain;
|
|
|
|
if (trans->msg_type == NFT_MSG_NEWRULE ||
|
|
trans->msg_type == NFT_MSG_DELRULE) {
|
|
kvfree(chain->blob_next);
|
|
chain->blob_next = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
|
|
{
|
|
struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
|
|
|
|
kvfree(l->blob);
|
|
}
|
|
|
|
static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
|
|
{
|
|
struct nft_rule_dp_last *last;
|
|
|
|
/* last rule trailer is after end marker */
|
|
last = (void *)blob + sizeof(*blob) + blob->size;
|
|
last->blob = blob;
|
|
|
|
call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
|
|
}
|
|
|
|
static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
|
|
{
|
|
struct nft_rule_blob *g0, *g1;
|
|
bool next_genbit;
|
|
|
|
next_genbit = nft_gencursor_next(net);
|
|
|
|
g0 = rcu_dereference_protected(chain->blob_gen_0,
|
|
lockdep_commit_lock_is_held(net));
|
|
g1 = rcu_dereference_protected(chain->blob_gen_1,
|
|
lockdep_commit_lock_is_held(net));
|
|
|
|
/* No changes to this chain? */
|
|
if (chain->blob_next == NULL) {
|
|
/* chain had no change in last or next generation */
|
|
if (g0 == g1)
|
|
return;
|
|
/*
|
|
* chain had no change in this generation; make sure next
|
|
* one uses same rules as current generation.
|
|
*/
|
|
if (next_genbit) {
|
|
rcu_assign_pointer(chain->blob_gen_1, g0);
|
|
nf_tables_commit_chain_free_rules_old(g1);
|
|
} else {
|
|
rcu_assign_pointer(chain->blob_gen_0, g1);
|
|
nf_tables_commit_chain_free_rules_old(g0);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
if (next_genbit)
|
|
rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
|
|
else
|
|
rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
|
|
|
|
chain->blob_next = NULL;
|
|
|
|
if (g0 == g1)
|
|
return;
|
|
|
|
if (next_genbit)
|
|
nf_tables_commit_chain_free_rules_old(g1);
|
|
else
|
|
nf_tables_commit_chain_free_rules_old(g0);
|
|
}
|
|
|
|
static void nft_obj_del(struct nft_object *obj)
|
|
{
|
|
rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
|
|
list_del_rcu(&obj->list);
|
|
}
|
|
|
|
void nft_chain_del(struct nft_chain *chain)
|
|
{
|
|
struct nft_table *table = chain->table;
|
|
|
|
WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
|
|
nft_chain_ht_params));
|
|
list_del_rcu(&chain->list);
|
|
}
|
|
|
|
static void nft_trans_gc_setelem_remove(struct nft_ctx *ctx,
|
|
struct nft_trans_gc *trans)
|
|
{
|
|
void **priv = trans->priv;
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < trans->count; i++) {
|
|
struct nft_set_elem elem = {
|
|
.priv = priv[i],
|
|
};
|
|
|
|
nft_setelem_data_deactivate(ctx->net, trans->set, &elem);
|
|
nft_setelem_remove(ctx->net, trans->set, &elem);
|
|
}
|
|
}
|
|
|
|
void nft_trans_gc_destroy(struct nft_trans_gc *trans)
|
|
{
|
|
nft_set_put(trans->set);
|
|
put_net(trans->net);
|
|
kfree(trans);
|
|
}
|
|
|
|
static void nft_trans_gc_trans_free(struct rcu_head *rcu)
|
|
{
|
|
struct nft_set_elem elem = {};
|
|
struct nft_trans_gc *trans;
|
|
struct nft_ctx ctx = {};
|
|
unsigned int i;
|
|
|
|
trans = container_of(rcu, struct nft_trans_gc, rcu);
|
|
ctx.net = read_pnet(&trans->set->net);
|
|
|
|
for (i = 0; i < trans->count; i++) {
|
|
elem.priv = trans->priv[i];
|
|
if (!nft_setelem_is_catchall(trans->set, &elem))
|
|
atomic_dec(&trans->set->nelems);
|
|
|
|
nf_tables_set_elem_destroy(&ctx, trans->set, elem.priv);
|
|
}
|
|
|
|
nft_trans_gc_destroy(trans);
|
|
}
|
|
|
|
static bool nft_trans_gc_work_done(struct nft_trans_gc *trans)
|
|
{
|
|
struct nftables_pernet *nft_net;
|
|
struct nft_ctx ctx = {};
|
|
|
|
nft_net = nft_pernet(trans->net);
|
|
|
|
mutex_lock(&nft_net->commit_mutex);
|
|
|
|
/* Check for race with transaction, otherwise this batch refers to
|
|
* stale objects that might not be there anymore. Skip transaction if
|
|
* set has been destroyed from control plane transaction in case gc
|
|
* worker loses race.
|
|
*/
|
|
if (READ_ONCE(nft_net->gc_seq) != trans->seq || trans->set->dead) {
|
|
mutex_unlock(&nft_net->commit_mutex);
|
|
return false;
|
|
}
|
|
|
|
ctx.net = trans->net;
|
|
ctx.table = trans->set->table;
|
|
|
|
nft_trans_gc_setelem_remove(&ctx, trans);
|
|
mutex_unlock(&nft_net->commit_mutex);
|
|
|
|
return true;
|
|
}
|
|
|
|
static void nft_trans_gc_work(struct work_struct *work)
|
|
{
|
|
struct nft_trans_gc *trans, *next;
|
|
LIST_HEAD(trans_gc_list);
|
|
|
|
spin_lock(&nf_tables_gc_list_lock);
|
|
list_splice_init(&nf_tables_gc_list, &trans_gc_list);
|
|
spin_unlock(&nf_tables_gc_list_lock);
|
|
|
|
list_for_each_entry_safe(trans, next, &trans_gc_list, list) {
|
|
list_del(&trans->list);
|
|
if (!nft_trans_gc_work_done(trans)) {
|
|
nft_trans_gc_destroy(trans);
|
|
continue;
|
|
}
|
|
call_rcu(&trans->rcu, nft_trans_gc_trans_free);
|
|
}
|
|
}
|
|
|
|
struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
|
|
unsigned int gc_seq, gfp_t gfp)
|
|
{
|
|
struct net *net = read_pnet(&set->net);
|
|
struct nft_trans_gc *trans;
|
|
|
|
trans = kzalloc(sizeof(*trans), gfp);
|
|
if (!trans)
|
|
return NULL;
|
|
|
|
trans->net = maybe_get_net(net);
|
|
if (!trans->net) {
|
|
kfree(trans);
|
|
return NULL;
|
|
}
|
|
|
|
refcount_inc(&set->refs);
|
|
trans->set = set;
|
|
trans->seq = gc_seq;
|
|
|
|
return trans;
|
|
}
|
|
|
|
void nft_trans_gc_elem_add(struct nft_trans_gc *trans, void *priv)
|
|
{
|
|
trans->priv[trans->count++] = priv;
|
|
}
|
|
|
|
static void nft_trans_gc_queue_work(struct nft_trans_gc *trans)
|
|
{
|
|
spin_lock(&nf_tables_gc_list_lock);
|
|
list_add_tail(&trans->list, &nf_tables_gc_list);
|
|
spin_unlock(&nf_tables_gc_list_lock);
|
|
|
|
schedule_work(&trans_gc_work);
|
|
}
|
|
|
|
static int nft_trans_gc_space(struct nft_trans_gc *trans)
|
|
{
|
|
return NFT_TRANS_GC_BATCHCOUNT - trans->count;
|
|
}
|
|
|
|
struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
|
|
unsigned int gc_seq, gfp_t gfp)
|
|
{
|
|
if (nft_trans_gc_space(gc))
|
|
return gc;
|
|
|
|
nft_trans_gc_queue_work(gc);
|
|
|
|
return nft_trans_gc_alloc(gc->set, gc_seq, gfp);
|
|
}
|
|
|
|
void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
|
|
{
|
|
if (trans->count == 0) {
|
|
nft_trans_gc_destroy(trans);
|
|
return;
|
|
}
|
|
|
|
nft_trans_gc_queue_work(trans);
|
|
}
|
|
|
|
struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
|
|
{
|
|
if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
|
|
return NULL;
|
|
|
|
if (nft_trans_gc_space(gc))
|
|
return gc;
|
|
|
|
call_rcu(&gc->rcu, nft_trans_gc_trans_free);
|
|
|
|
return nft_trans_gc_alloc(gc->set, 0, gfp);
|
|
}
|
|
|
|
void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
|
|
{
|
|
WARN_ON_ONCE(!lockdep_commit_lock_is_held(trans->net));
|
|
|
|
if (trans->count == 0) {
|
|
nft_trans_gc_destroy(trans);
|
|
return;
|
|
}
|
|
|
|
call_rcu(&trans->rcu, nft_trans_gc_trans_free);
|
|
}
|
|
|
|
struct nft_trans_gc *nft_trans_gc_catchall(struct nft_trans_gc *gc,
|
|
unsigned int gc_seq)
|
|
{
|
|
struct nft_set_elem_catchall *catchall;
|
|
const struct nft_set *set = gc->set;
|
|
struct nft_set_ext *ext;
|
|
|
|
list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
|
|
ext = nft_set_elem_ext(set, catchall->elem);
|
|
|
|
if (!nft_set_elem_expired(ext))
|
|
continue;
|
|
if (nft_set_elem_is_dead(ext))
|
|
goto dead_elem;
|
|
|
|
nft_set_elem_dead(ext);
|
|
dead_elem:
|
|
gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
|
|
if (!gc)
|
|
return NULL;
|
|
|
|
nft_trans_gc_elem_add(gc, catchall->elem);
|
|
}
|
|
|
|
return gc;
|
|
}
|
|
|
|
static void nf_tables_module_autoload_cleanup(struct net *net)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(net);
|
|
struct nft_module_request *req, *next;
|
|
|
|
WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
|
|
list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
|
|
WARN_ON_ONCE(!req->done);
|
|
list_del(&req->list);
|
|
kfree(req);
|
|
}
|
|
}
|
|
|
|
static void nf_tables_commit_release(struct net *net)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(net);
|
|
struct nft_trans *trans;
|
|
|
|
/* all side effects have to be made visible.
|
|
* For example, if a chain named 'foo' has been deleted, a
|
|
* new transaction must not find it anymore.
|
|
*
|
|
* Memory reclaim happens asynchronously from work queue
|
|
* to prevent expensive synchronize_rcu() in commit phase.
|
|
*/
|
|
if (list_empty(&nft_net->commit_list)) {
|
|
nf_tables_module_autoload_cleanup(net);
|
|
mutex_unlock(&nft_net->commit_mutex);
|
|
return;
|
|
}
|
|
|
|
trans = list_last_entry(&nft_net->commit_list,
|
|
struct nft_trans, list);
|
|
get_net(trans->ctx.net);
|
|
WARN_ON_ONCE(trans->put_net);
|
|
|
|
trans->put_net = true;
|
|
spin_lock(&nf_tables_destroy_list_lock);
|
|
list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
|
|
spin_unlock(&nf_tables_destroy_list_lock);
|
|
|
|
nf_tables_module_autoload_cleanup(net);
|
|
schedule_work(&trans_destroy_work);
|
|
|
|
mutex_unlock(&nft_net->commit_mutex);
|
|
}
|
|
|
|
static void nft_commit_notify(struct net *net, u32 portid)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(net);
|
|
struct sk_buff *batch_skb = NULL, *nskb, *skb;
|
|
unsigned char *data;
|
|
int len;
|
|
|
|
list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
|
|
if (!batch_skb) {
|
|
new_batch:
|
|
batch_skb = skb;
|
|
len = NLMSG_GOODSIZE - skb->len;
|
|
list_del(&skb->list);
|
|
continue;
|
|
}
|
|
len -= skb->len;
|
|
if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
|
|
data = skb_put(batch_skb, skb->len);
|
|
memcpy(data, skb->data, skb->len);
|
|
list_del(&skb->list);
|
|
kfree_skb(skb);
|
|
continue;
|
|
}
|
|
nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
|
|
NFT_CB(batch_skb).report, GFP_KERNEL);
|
|
goto new_batch;
|
|
}
|
|
|
|
if (batch_skb) {
|
|
nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
|
|
NFT_CB(batch_skb).report, GFP_KERNEL);
|
|
}
|
|
|
|
WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
|
|
}
|
|
|
|
static int nf_tables_commit_audit_alloc(struct list_head *adl,
|
|
struct nft_table *table)
|
|
{
|
|
struct nft_audit_data *adp;
|
|
|
|
list_for_each_entry(adp, adl, list) {
|
|
if (adp->table == table)
|
|
return 0;
|
|
}
|
|
adp = kzalloc(sizeof(*adp), GFP_KERNEL);
|
|
if (!adp)
|
|
return -ENOMEM;
|
|
adp->table = table;
|
|
list_add(&adp->list, adl);
|
|
return 0;
|
|
}
|
|
|
|
static void nf_tables_commit_audit_free(struct list_head *adl)
|
|
{
|
|
struct nft_audit_data *adp, *adn;
|
|
|
|
list_for_each_entry_safe(adp, adn, adl, list) {
|
|
list_del(&adp->list);
|
|
kfree(adp);
|
|
}
|
|
}
|
|
|
|
static void nf_tables_commit_audit_collect(struct list_head *adl,
|
|
struct nft_table *table, u32 op)
|
|
{
|
|
struct nft_audit_data *adp;
|
|
|
|
list_for_each_entry(adp, adl, list) {
|
|
if (adp->table == table)
|
|
goto found;
|
|
}
|
|
WARN_ONCE(1, "table=%s not expected in commit list", table->name);
|
|
return;
|
|
found:
|
|
adp->entries++;
|
|
if (!adp->op || adp->op > op)
|
|
adp->op = op;
|
|
}
|
|
|
|
#define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
|
|
|
|
static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
|
|
{
|
|
struct nft_audit_data *adp, *adn;
|
|
char aubuf[AUNFTABLENAMELEN];
|
|
|
|
list_for_each_entry_safe(adp, adn, adl, list) {
|
|
snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
|
|
generation);
|
|
audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
|
|
nft2audit_op[adp->op], GFP_KERNEL);
|
|
list_del(&adp->list);
|
|
kfree(adp);
|
|
}
|
|
}
|
|
|
|
static void nft_set_commit_update(struct list_head *set_update_list)
|
|
{
|
|
struct nft_set *set, *next;
|
|
|
|
list_for_each_entry_safe(set, next, set_update_list, pending_update) {
|
|
list_del_init(&set->pending_update);
|
|
|
|
if (!set->ops->commit)
|
|
continue;
|
|
|
|
set->ops->commit(set);
|
|
}
|
|
}
|
|
|
|
static unsigned int nft_gc_seq_begin(struct nftables_pernet *nft_net)
|
|
{
|
|
unsigned int gc_seq;
|
|
|
|
/* Bump gc counter, it becomes odd, this is the busy mark. */
|
|
gc_seq = READ_ONCE(nft_net->gc_seq);
|
|
WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
|
|
|
|
return gc_seq;
|
|
}
|
|
|
|
static void nft_gc_seq_end(struct nftables_pernet *nft_net, unsigned int gc_seq)
|
|
{
|
|
WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
|
|
}
|
|
|
|
static int nf_tables_commit(struct net *net, struct sk_buff *skb)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(net);
|
|
struct nft_trans *trans, *next;
|
|
unsigned int base_seq, gc_seq;
|
|
LIST_HEAD(set_update_list);
|
|
struct nft_trans_elem *te;
|
|
struct nft_chain *chain;
|
|
struct nft_table *table;
|
|
LIST_HEAD(adl);
|
|
int err;
|
|
|
|
if (list_empty(&nft_net->commit_list)) {
|
|
mutex_unlock(&nft_net->commit_mutex);
|
|
return 0;
|
|
}
|
|
|
|
list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
|
|
switch (trans->msg_type) {
|
|
case NFT_MSG_NEWSET:
|
|
if (!nft_trans_set_update(trans) &&
|
|
nft_set_is_anonymous(nft_trans_set(trans)) &&
|
|
!nft_trans_set_bound(trans)) {
|
|
pr_warn_once("nftables ruleset with unbound set\n");
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
case NFT_MSG_NEWCHAIN:
|
|
if (!nft_trans_chain_update(trans) &&
|
|
nft_chain_binding(nft_trans_chain(trans)) &&
|
|
!nft_trans_chain_bound(trans)) {
|
|
pr_warn_once("nftables ruleset with unbound chain\n");
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* 0. Validate ruleset, otherwise roll back for error reporting. */
|
|
if (nf_tables_validate(net) < 0) {
|
|
nft_net->validate_state = NFT_VALIDATE_DO;
|
|
return -EAGAIN;
|
|
}
|
|
|
|
err = nft_flow_rule_offload_commit(net);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
/* 1. Allocate space for next generation rules_gen_X[] */
|
|
list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
|
|
int ret;
|
|
|
|
ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
|
|
if (ret) {
|
|
nf_tables_commit_chain_prepare_cancel(net);
|
|
nf_tables_commit_audit_free(&adl);
|
|
return ret;
|
|
}
|
|
if (trans->msg_type == NFT_MSG_NEWRULE ||
|
|
trans->msg_type == NFT_MSG_DELRULE) {
|
|
chain = trans->ctx.chain;
|
|
|
|
ret = nf_tables_commit_chain_prepare(net, chain);
|
|
if (ret < 0) {
|
|
nf_tables_commit_chain_prepare_cancel(net);
|
|
nf_tables_commit_audit_free(&adl);
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* step 2. Make rules_gen_X visible to packet path */
|
|
list_for_each_entry(table, &nft_net->tables, list) {
|
|
list_for_each_entry(chain, &table->chains, list)
|
|
nf_tables_commit_chain(net, chain);
|
|
}
|
|
|
|
/*
|
|
* Bump generation counter, invalidate any dump in progress.
|
|
* Cannot fail after this point.
|
|
*/
|
|
base_seq = READ_ONCE(nft_net->base_seq);
|
|
while (++base_seq == 0)
|
|
;
|
|
|
|
WRITE_ONCE(nft_net->base_seq, base_seq);
|
|
|
|
gc_seq = nft_gc_seq_begin(nft_net);
|
|
|
|
/* step 3. Start new generation, rules_gen_X now in use. */
|
|
net->nft.gencursor = nft_gencursor_next(net);
|
|
|
|
list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
|
|
nf_tables_commit_audit_collect(&adl, trans->ctx.table,
|
|
trans->msg_type);
|
|
switch (trans->msg_type) {
|
|
case NFT_MSG_NEWTABLE:
|
|
if (nft_trans_table_update(trans)) {
|
|
if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
}
|
|
if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
|
|
nf_tables_table_disable(net, trans->ctx.table);
|
|
|
|
trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
|
|
} else {
|
|
nft_clear(net, trans->ctx.table);
|
|
}
|
|
nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
case NFT_MSG_DELTABLE:
|
|
case NFT_MSG_DESTROYTABLE:
|
|
list_del_rcu(&trans->ctx.table->list);
|
|
nf_tables_table_notify(&trans->ctx, trans->msg_type);
|
|
break;
|
|
case NFT_MSG_NEWCHAIN:
|
|
if (nft_trans_chain_update(trans)) {
|
|
nft_chain_commit_update(trans);
|
|
nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
|
|
&nft_trans_chain_hooks(trans));
|
|
list_splice(&nft_trans_chain_hooks(trans),
|
|
&nft_trans_basechain(trans)->hook_list);
|
|
/* trans destroyed after rcu grace period */
|
|
} else {
|
|
nft_chain_commit_drop_policy(trans);
|
|
nft_clear(net, trans->ctx.chain);
|
|
nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
|
|
nft_trans_destroy(trans);
|
|
}
|
|
break;
|
|
case NFT_MSG_DELCHAIN:
|
|
case NFT_MSG_DESTROYCHAIN:
|
|
if (nft_trans_chain_update(trans)) {
|
|
nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
|
|
&nft_trans_chain_hooks(trans));
|
|
nft_netdev_unregister_hooks(net,
|
|
&nft_trans_chain_hooks(trans),
|
|
true);
|
|
} else {
|
|
nft_chain_del(trans->ctx.chain);
|
|
nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
|
|
NULL);
|
|
nf_tables_unregister_hook(trans->ctx.net,
|
|
trans->ctx.table,
|
|
trans->ctx.chain);
|
|
}
|
|
break;
|
|
case NFT_MSG_NEWRULE:
|
|
nft_clear(trans->ctx.net, nft_trans_rule(trans));
|
|
nf_tables_rule_notify(&trans->ctx,
|
|
nft_trans_rule(trans),
|
|
NFT_MSG_NEWRULE);
|
|
if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
|
|
nft_flow_rule_destroy(nft_trans_flow_rule(trans));
|
|
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
case NFT_MSG_DELRULE:
|
|
case NFT_MSG_DESTROYRULE:
|
|
list_del_rcu(&nft_trans_rule(trans)->list);
|
|
nf_tables_rule_notify(&trans->ctx,
|
|
nft_trans_rule(trans),
|
|
trans->msg_type);
|
|
nft_rule_expr_deactivate(&trans->ctx,
|
|
nft_trans_rule(trans),
|
|
NFT_TRANS_COMMIT);
|
|
|
|
if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
|
|
nft_flow_rule_destroy(nft_trans_flow_rule(trans));
|
|
break;
|
|
case NFT_MSG_NEWSET:
|
|
if (nft_trans_set_update(trans)) {
|
|
struct nft_set *set = nft_trans_set(trans);
|
|
|
|
WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
|
|
WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
|
|
} else {
|
|
nft_clear(net, nft_trans_set(trans));
|
|
/* This avoids hitting -EBUSY when deleting the table
|
|
* from the transaction.
|
|
*/
|
|
if (nft_set_is_anonymous(nft_trans_set(trans)) &&
|
|
!list_empty(&nft_trans_set(trans)->bindings))
|
|
nft_use_dec(&trans->ctx.table->use);
|
|
}
|
|
nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
|
|
NFT_MSG_NEWSET, GFP_KERNEL);
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
case NFT_MSG_DELSET:
|
|
case NFT_MSG_DESTROYSET:
|
|
nft_trans_set(trans)->dead = 1;
|
|
list_del_rcu(&nft_trans_set(trans)->list);
|
|
nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
|
|
trans->msg_type, GFP_KERNEL);
|
|
break;
|
|
case NFT_MSG_NEWSETELEM:
|
|
te = (struct nft_trans_elem *)trans->data;
|
|
|
|
nft_setelem_activate(net, te->set, &te->elem);
|
|
nf_tables_setelem_notify(&trans->ctx, te->set,
|
|
&te->elem,
|
|
NFT_MSG_NEWSETELEM);
|
|
if (te->set->ops->commit &&
|
|
list_empty(&te->set->pending_update)) {
|
|
list_add_tail(&te->set->pending_update,
|
|
&set_update_list);
|
|
}
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
case NFT_MSG_DELSETELEM:
|
|
case NFT_MSG_DESTROYSETELEM:
|
|
te = (struct nft_trans_elem *)trans->data;
|
|
|
|
nf_tables_setelem_notify(&trans->ctx, te->set,
|
|
&te->elem,
|
|
trans->msg_type);
|
|
nft_setelem_remove(net, te->set, &te->elem);
|
|
if (!nft_setelem_is_catchall(te->set, &te->elem)) {
|
|
atomic_dec(&te->set->nelems);
|
|
te->set->ndeact--;
|
|
}
|
|
if (te->set->ops->commit &&
|
|
list_empty(&te->set->pending_update)) {
|
|
list_add_tail(&te->set->pending_update,
|
|
&set_update_list);
|
|
}
|
|
break;
|
|
case NFT_MSG_NEWOBJ:
|
|
if (nft_trans_obj_update(trans)) {
|
|
nft_obj_commit_update(trans);
|
|
nf_tables_obj_notify(&trans->ctx,
|
|
nft_trans_obj(trans),
|
|
NFT_MSG_NEWOBJ);
|
|
} else {
|
|
nft_clear(net, nft_trans_obj(trans));
|
|
nf_tables_obj_notify(&trans->ctx,
|
|
nft_trans_obj(trans),
|
|
NFT_MSG_NEWOBJ);
|
|
nft_trans_destroy(trans);
|
|
}
|
|
break;
|
|
case NFT_MSG_DELOBJ:
|
|
case NFT_MSG_DESTROYOBJ:
|
|
nft_obj_del(nft_trans_obj(trans));
|
|
nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
|
|
trans->msg_type);
|
|
break;
|
|
case NFT_MSG_NEWFLOWTABLE:
|
|
if (nft_trans_flowtable_update(trans)) {
|
|
nft_trans_flowtable(trans)->data.flags =
|
|
nft_trans_flowtable_flags(trans);
|
|
nf_tables_flowtable_notify(&trans->ctx,
|
|
nft_trans_flowtable(trans),
|
|
&nft_trans_flowtable_hooks(trans),
|
|
NFT_MSG_NEWFLOWTABLE);
|
|
list_splice(&nft_trans_flowtable_hooks(trans),
|
|
&nft_trans_flowtable(trans)->hook_list);
|
|
} else {
|
|
nft_clear(net, nft_trans_flowtable(trans));
|
|
nf_tables_flowtable_notify(&trans->ctx,
|
|
nft_trans_flowtable(trans),
|
|
NULL,
|
|
NFT_MSG_NEWFLOWTABLE);
|
|
}
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
case NFT_MSG_DELFLOWTABLE:
|
|
case NFT_MSG_DESTROYFLOWTABLE:
|
|
if (nft_trans_flowtable_update(trans)) {
|
|
nf_tables_flowtable_notify(&trans->ctx,
|
|
nft_trans_flowtable(trans),
|
|
&nft_trans_flowtable_hooks(trans),
|
|
trans->msg_type);
|
|
nft_unregister_flowtable_net_hooks(net,
|
|
&nft_trans_flowtable_hooks(trans));
|
|
} else {
|
|
list_del_rcu(&nft_trans_flowtable(trans)->list);
|
|
nf_tables_flowtable_notify(&trans->ctx,
|
|
nft_trans_flowtable(trans),
|
|
NULL,
|
|
trans->msg_type);
|
|
nft_unregister_flowtable_net_hooks(net,
|
|
&nft_trans_flowtable(trans)->hook_list);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
nft_set_commit_update(&set_update_list);
|
|
|
|
nft_commit_notify(net, NETLINK_CB(skb).portid);
|
|
nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
|
|
nf_tables_commit_audit_log(&adl, nft_net->base_seq);
|
|
|
|
nft_gc_seq_end(nft_net, gc_seq);
|
|
nft_net->validate_state = NFT_VALIDATE_SKIP;
|
|
nf_tables_commit_release(net);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void nf_tables_module_autoload(struct net *net)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(net);
|
|
struct nft_module_request *req, *next;
|
|
LIST_HEAD(module_list);
|
|
|
|
list_splice_init(&nft_net->module_list, &module_list);
|
|
mutex_unlock(&nft_net->commit_mutex);
|
|
list_for_each_entry_safe(req, next, &module_list, list) {
|
|
request_module("%s", req->module);
|
|
req->done = true;
|
|
}
|
|
mutex_lock(&nft_net->commit_mutex);
|
|
list_splice(&module_list, &nft_net->module_list);
|
|
}
|
|
|
|
static void nf_tables_abort_release(struct nft_trans *trans)
|
|
{
|
|
switch (trans->msg_type) {
|
|
case NFT_MSG_NEWTABLE:
|
|
nf_tables_table_destroy(&trans->ctx);
|
|
break;
|
|
case NFT_MSG_NEWCHAIN:
|
|
if (nft_trans_chain_update(trans))
|
|
nft_hooks_destroy(&nft_trans_chain_hooks(trans));
|
|
else
|
|
nf_tables_chain_destroy(&trans->ctx);
|
|
break;
|
|
case NFT_MSG_NEWRULE:
|
|
nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
|
|
break;
|
|
case NFT_MSG_NEWSET:
|
|
nft_set_destroy(&trans->ctx, nft_trans_set(trans));
|
|
break;
|
|
case NFT_MSG_NEWSETELEM:
|
|
nft_set_elem_destroy(nft_trans_elem_set(trans),
|
|
nft_trans_elem(trans).priv, true);
|
|
break;
|
|
case NFT_MSG_NEWOBJ:
|
|
nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
|
|
break;
|
|
case NFT_MSG_NEWFLOWTABLE:
|
|
if (nft_trans_flowtable_update(trans))
|
|
nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
|
|
else
|
|
nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
|
|
break;
|
|
}
|
|
kfree(trans);
|
|
}
|
|
|
|
static void nft_set_abort_update(struct list_head *set_update_list)
|
|
{
|
|
struct nft_set *set, *next;
|
|
|
|
list_for_each_entry_safe(set, next, set_update_list, pending_update) {
|
|
list_del_init(&set->pending_update);
|
|
|
|
if (!set->ops->abort)
|
|
continue;
|
|
|
|
set->ops->abort(set);
|
|
}
|
|
}
|
|
|
|
static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(net);
|
|
struct nft_trans *trans, *next;
|
|
LIST_HEAD(set_update_list);
|
|
struct nft_trans_elem *te;
|
|
|
|
if (action == NFNL_ABORT_VALIDATE &&
|
|
nf_tables_validate(net) < 0)
|
|
return -EAGAIN;
|
|
|
|
list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
|
|
list) {
|
|
switch (trans->msg_type) {
|
|
case NFT_MSG_NEWTABLE:
|
|
if (nft_trans_table_update(trans)) {
|
|
if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
}
|
|
if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
|
|
nf_tables_table_disable(net, trans->ctx.table);
|
|
trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
|
|
} else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
|
|
trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
|
|
}
|
|
trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
|
|
nft_trans_destroy(trans);
|
|
} else {
|
|
list_del_rcu(&trans->ctx.table->list);
|
|
}
|
|
break;
|
|
case NFT_MSG_DELTABLE:
|
|
case NFT_MSG_DESTROYTABLE:
|
|
nft_clear(trans->ctx.net, trans->ctx.table);
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
case NFT_MSG_NEWCHAIN:
|
|
if (nft_trans_chain_update(trans)) {
|
|
nft_netdev_unregister_hooks(net,
|
|
&nft_trans_chain_hooks(trans),
|
|
true);
|
|
free_percpu(nft_trans_chain_stats(trans));
|
|
kfree(nft_trans_chain_name(trans));
|
|
nft_trans_destroy(trans);
|
|
} else {
|
|
if (nft_trans_chain_bound(trans)) {
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
}
|
|
nft_use_dec_restore(&trans->ctx.table->use);
|
|
nft_chain_del(trans->ctx.chain);
|
|
nf_tables_unregister_hook(trans->ctx.net,
|
|
trans->ctx.table,
|
|
trans->ctx.chain);
|
|
}
|
|
break;
|
|
case NFT_MSG_DELCHAIN:
|
|
case NFT_MSG_DESTROYCHAIN:
|
|
if (nft_trans_chain_update(trans)) {
|
|
list_splice(&nft_trans_chain_hooks(trans),
|
|
&nft_trans_basechain(trans)->hook_list);
|
|
} else {
|
|
nft_use_inc_restore(&trans->ctx.table->use);
|
|
nft_clear(trans->ctx.net, trans->ctx.chain);
|
|
}
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
case NFT_MSG_NEWRULE:
|
|
if (nft_trans_rule_bound(trans)) {
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
}
|
|
nft_use_dec_restore(&trans->ctx.chain->use);
|
|
list_del_rcu(&nft_trans_rule(trans)->list);
|
|
nft_rule_expr_deactivate(&trans->ctx,
|
|
nft_trans_rule(trans),
|
|
NFT_TRANS_ABORT);
|
|
if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
|
|
nft_flow_rule_destroy(nft_trans_flow_rule(trans));
|
|
break;
|
|
case NFT_MSG_DELRULE:
|
|
case NFT_MSG_DESTROYRULE:
|
|
nft_use_inc_restore(&trans->ctx.chain->use);
|
|
nft_clear(trans->ctx.net, nft_trans_rule(trans));
|
|
nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
|
|
if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
|
|
nft_flow_rule_destroy(nft_trans_flow_rule(trans));
|
|
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
case NFT_MSG_NEWSET:
|
|
if (nft_trans_set_update(trans)) {
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
}
|
|
nft_use_dec_restore(&trans->ctx.table->use);
|
|
if (nft_trans_set_bound(trans)) {
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
}
|
|
list_del_rcu(&nft_trans_set(trans)->list);
|
|
break;
|
|
case NFT_MSG_DELSET:
|
|
case NFT_MSG_DESTROYSET:
|
|
nft_use_inc_restore(&trans->ctx.table->use);
|
|
nft_clear(trans->ctx.net, nft_trans_set(trans));
|
|
if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
|
|
nft_map_activate(&trans->ctx, nft_trans_set(trans));
|
|
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
case NFT_MSG_NEWSETELEM:
|
|
if (nft_trans_elem_set_bound(trans)) {
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
}
|
|
te = (struct nft_trans_elem *)trans->data;
|
|
nft_setelem_remove(net, te->set, &te->elem);
|
|
if (!nft_setelem_is_catchall(te->set, &te->elem))
|
|
atomic_dec(&te->set->nelems);
|
|
|
|
if (te->set->ops->abort &&
|
|
list_empty(&te->set->pending_update)) {
|
|
list_add_tail(&te->set->pending_update,
|
|
&set_update_list);
|
|
}
|
|
break;
|
|
case NFT_MSG_DELSETELEM:
|
|
case NFT_MSG_DESTROYSETELEM:
|
|
te = (struct nft_trans_elem *)trans->data;
|
|
|
|
nft_setelem_data_activate(net, te->set, &te->elem);
|
|
nft_setelem_activate(net, te->set, &te->elem);
|
|
if (!nft_setelem_is_catchall(te->set, &te->elem))
|
|
te->set->ndeact--;
|
|
|
|
if (te->set->ops->abort &&
|
|
list_empty(&te->set->pending_update)) {
|
|
list_add_tail(&te->set->pending_update,
|
|
&set_update_list);
|
|
}
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
case NFT_MSG_NEWOBJ:
|
|
if (nft_trans_obj_update(trans)) {
|
|
nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
|
|
nft_trans_destroy(trans);
|
|
} else {
|
|
nft_use_dec_restore(&trans->ctx.table->use);
|
|
nft_obj_del(nft_trans_obj(trans));
|
|
}
|
|
break;
|
|
case NFT_MSG_DELOBJ:
|
|
case NFT_MSG_DESTROYOBJ:
|
|
nft_use_inc_restore(&trans->ctx.table->use);
|
|
nft_clear(trans->ctx.net, nft_trans_obj(trans));
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
case NFT_MSG_NEWFLOWTABLE:
|
|
if (nft_trans_flowtable_update(trans)) {
|
|
nft_unregister_flowtable_net_hooks(net,
|
|
&nft_trans_flowtable_hooks(trans));
|
|
} else {
|
|
nft_use_dec_restore(&trans->ctx.table->use);
|
|
list_del_rcu(&nft_trans_flowtable(trans)->list);
|
|
nft_unregister_flowtable_net_hooks(net,
|
|
&nft_trans_flowtable(trans)->hook_list);
|
|
}
|
|
break;
|
|
case NFT_MSG_DELFLOWTABLE:
|
|
case NFT_MSG_DESTROYFLOWTABLE:
|
|
if (nft_trans_flowtable_update(trans)) {
|
|
list_splice(&nft_trans_flowtable_hooks(trans),
|
|
&nft_trans_flowtable(trans)->hook_list);
|
|
} else {
|
|
nft_use_inc_restore(&trans->ctx.table->use);
|
|
nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
|
|
}
|
|
nft_trans_destroy(trans);
|
|
break;
|
|
}
|
|
}
|
|
|
|
nft_set_abort_update(&set_update_list);
|
|
|
|
synchronize_rcu();
|
|
|
|
list_for_each_entry_safe_reverse(trans, next,
|
|
&nft_net->commit_list, list) {
|
|
nft_trans_list_del(trans);
|
|
nf_tables_abort_release(trans);
|
|
}
|
|
|
|
if (action == NFNL_ABORT_AUTOLOAD)
|
|
nf_tables_module_autoload(net);
|
|
else
|
|
nf_tables_module_autoload_cleanup(net);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nf_tables_abort(struct net *net, struct sk_buff *skb,
|
|
enum nfnl_abort_action action)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(net);
|
|
unsigned int gc_seq;
|
|
int ret;
|
|
|
|
gc_seq = nft_gc_seq_begin(nft_net);
|
|
ret = __nf_tables_abort(net, action);
|
|
nft_gc_seq_end(nft_net, gc_seq);
|
|
mutex_unlock(&nft_net->commit_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static bool nf_tables_valid_genid(struct net *net, u32 genid)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(net);
|
|
bool genid_ok;
|
|
|
|
mutex_lock(&nft_net->commit_mutex);
|
|
|
|
genid_ok = genid == 0 || nft_net->base_seq == genid;
|
|
if (!genid_ok)
|
|
mutex_unlock(&nft_net->commit_mutex);
|
|
|
|
/* else, commit mutex has to be released by commit or abort function */
|
|
return genid_ok;
|
|
}
|
|
|
|
static const struct nfnetlink_subsystem nf_tables_subsys = {
|
|
.name = "nf_tables",
|
|
.subsys_id = NFNL_SUBSYS_NFTABLES,
|
|
.cb_count = NFT_MSG_MAX,
|
|
.cb = nf_tables_cb,
|
|
.commit = nf_tables_commit,
|
|
.abort = nf_tables_abort,
|
|
.valid_genid = nf_tables_valid_genid,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
int nft_chain_validate_dependency(const struct nft_chain *chain,
|
|
enum nft_chain_types type)
|
|
{
|
|
const struct nft_base_chain *basechain;
|
|
|
|
if (nft_is_base_chain(chain)) {
|
|
basechain = nft_base_chain(chain);
|
|
if (basechain->type->type != type)
|
|
return -EOPNOTSUPP;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
|
|
|
|
int nft_chain_validate_hooks(const struct nft_chain *chain,
|
|
unsigned int hook_flags)
|
|
{
|
|
struct nft_base_chain *basechain;
|
|
|
|
if (nft_is_base_chain(chain)) {
|
|
basechain = nft_base_chain(chain);
|
|
|
|
if ((1 << basechain->ops.hooknum) & hook_flags)
|
|
return 0;
|
|
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
|
|
|
|
/*
|
|
* Loop detection - walk through the ruleset beginning at the destination chain
|
|
* of a new jump until either the source chain is reached (loop) or all
|
|
* reachable chains have been traversed.
|
|
*
|
|
* The loop check is performed whenever a new jump verdict is added to an
|
|
* expression or verdict map or a verdict map is bound to a new chain.
|
|
*/
|
|
|
|
static int nf_tables_check_loops(const struct nft_ctx *ctx,
|
|
const struct nft_chain *chain);
|
|
|
|
static int nft_check_loops(const struct nft_ctx *ctx,
|
|
const struct nft_set_ext *ext)
|
|
{
|
|
const struct nft_data *data;
|
|
int ret;
|
|
|
|
data = nft_set_ext_data(ext);
|
|
switch (data->verdict.code) {
|
|
case NFT_JUMP:
|
|
case NFT_GOTO:
|
|
ret = nf_tables_check_loops(ctx, data->verdict.chain);
|
|
break;
|
|
default:
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
|
|
struct nft_set *set,
|
|
const struct nft_set_iter *iter,
|
|
struct nft_set_elem *elem)
|
|
{
|
|
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
|
|
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
|
|
*nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
|
|
return 0;
|
|
|
|
return nft_check_loops(ctx, ext);
|
|
}
|
|
|
|
static int nft_set_catchall_loops(const struct nft_ctx *ctx,
|
|
struct nft_set *set)
|
|
{
|
|
u8 genmask = nft_genmask_next(ctx->net);
|
|
struct nft_set_elem_catchall *catchall;
|
|
struct nft_set_ext *ext;
|
|
int ret = 0;
|
|
|
|
list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
|
|
ext = nft_set_elem_ext(set, catchall->elem);
|
|
if (!nft_set_elem_active(ext, genmask))
|
|
continue;
|
|
|
|
ret = nft_check_loops(ctx, ext);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int nf_tables_check_loops(const struct nft_ctx *ctx,
|
|
const struct nft_chain *chain)
|
|
{
|
|
const struct nft_rule *rule;
|
|
const struct nft_expr *expr, *last;
|
|
struct nft_set *set;
|
|
struct nft_set_binding *binding;
|
|
struct nft_set_iter iter;
|
|
|
|
if (ctx->chain == chain)
|
|
return -ELOOP;
|
|
|
|
list_for_each_entry(rule, &chain->rules, list) {
|
|
nft_rule_for_each_expr(expr, last, rule) {
|
|
struct nft_immediate_expr *priv;
|
|
const struct nft_data *data;
|
|
int err;
|
|
|
|
if (strcmp(expr->ops->type->name, "immediate"))
|
|
continue;
|
|
|
|
priv = nft_expr_priv(expr);
|
|
if (priv->dreg != NFT_REG_VERDICT)
|
|
continue;
|
|
|
|
data = &priv->data;
|
|
switch (data->verdict.code) {
|
|
case NFT_JUMP:
|
|
case NFT_GOTO:
|
|
err = nf_tables_check_loops(ctx,
|
|
data->verdict.chain);
|
|
if (err < 0)
|
|
return err;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
list_for_each_entry(set, &ctx->table->sets, list) {
|
|
if (!nft_is_active_next(ctx->net, set))
|
|
continue;
|
|
if (!(set->flags & NFT_SET_MAP) ||
|
|
set->dtype != NFT_DATA_VERDICT)
|
|
continue;
|
|
|
|
list_for_each_entry(binding, &set->bindings, list) {
|
|
if (!(binding->flags & NFT_SET_MAP) ||
|
|
binding->chain != chain)
|
|
continue;
|
|
|
|
iter.genmask = nft_genmask_next(ctx->net);
|
|
iter.skip = 0;
|
|
iter.count = 0;
|
|
iter.err = 0;
|
|
iter.fn = nf_tables_loop_check_setelem;
|
|
|
|
set->ops->walk(ctx, set, &iter);
|
|
if (!iter.err)
|
|
iter.err = nft_set_catchall_loops(ctx, set);
|
|
|
|
if (iter.err < 0)
|
|
return iter.err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* nft_parse_u32_check - fetch u32 attribute and check for maximum value
|
|
*
|
|
* @attr: netlink attribute to fetch value from
|
|
* @max: maximum value to be stored in dest
|
|
* @dest: pointer to the variable
|
|
*
|
|
* Parse, check and store a given u32 netlink attribute into variable.
|
|
* This function returns -ERANGE if the value goes over maximum value.
|
|
* Otherwise a 0 is returned and the attribute value is stored in the
|
|
* destination variable.
|
|
*/
|
|
int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
|
|
{
|
|
u32 val;
|
|
|
|
val = ntohl(nla_get_be32(attr));
|
|
if (val > max)
|
|
return -ERANGE;
|
|
|
|
*dest = val;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_parse_u32_check);
|
|
|
|
static int nft_parse_register(const struct nlattr *attr, u32 *preg)
|
|
{
|
|
unsigned int reg;
|
|
|
|
reg = ntohl(nla_get_be32(attr));
|
|
switch (reg) {
|
|
case NFT_REG_VERDICT...NFT_REG_4:
|
|
*preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
|
|
break;
|
|
case NFT_REG32_00...NFT_REG32_15:
|
|
*preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
|
|
break;
|
|
default:
|
|
return -ERANGE;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* nft_dump_register - dump a register value to a netlink attribute
|
|
*
|
|
* @skb: socket buffer
|
|
* @attr: attribute number
|
|
* @reg: register number
|
|
*
|
|
* Construct a netlink attribute containing the register number. For
|
|
* compatibility reasons, register numbers being a multiple of 4 are
|
|
* translated to the corresponding 128 bit register numbers.
|
|
*/
|
|
int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
|
|
{
|
|
if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
|
|
reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
|
|
else
|
|
reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
|
|
|
|
return nla_put_be32(skb, attr, htonl(reg));
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_dump_register);
|
|
|
|
static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
|
|
{
|
|
if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
|
|
return -EINVAL;
|
|
if (len == 0)
|
|
return -EINVAL;
|
|
if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
|
|
return -ERANGE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
|
|
{
|
|
u32 reg;
|
|
int err;
|
|
|
|
err = nft_parse_register(attr, ®);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = nft_validate_register_load(reg, len);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
*sreg = reg;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_parse_register_load);
|
|
|
|
static int nft_validate_register_store(const struct nft_ctx *ctx,
|
|
enum nft_registers reg,
|
|
const struct nft_data *data,
|
|
enum nft_data_types type,
|
|
unsigned int len)
|
|
{
|
|
int err;
|
|
|
|
switch (reg) {
|
|
case NFT_REG_VERDICT:
|
|
if (type != NFT_DATA_VERDICT)
|
|
return -EINVAL;
|
|
|
|
if (data != NULL &&
|
|
(data->verdict.code == NFT_GOTO ||
|
|
data->verdict.code == NFT_JUMP)) {
|
|
err = nf_tables_check_loops(ctx, data->verdict.chain);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
default:
|
|
if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
|
|
return -EINVAL;
|
|
if (len == 0)
|
|
return -EINVAL;
|
|
if (reg * NFT_REG32_SIZE + len >
|
|
sizeof_field(struct nft_regs, data))
|
|
return -ERANGE;
|
|
|
|
if (data != NULL && type != NFT_DATA_VALUE)
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
int nft_parse_register_store(const struct nft_ctx *ctx,
|
|
const struct nlattr *attr, u8 *dreg,
|
|
const struct nft_data *data,
|
|
enum nft_data_types type, unsigned int len)
|
|
{
|
|
int err;
|
|
u32 reg;
|
|
|
|
err = nft_parse_register(attr, ®);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = nft_validate_register_store(ctx, reg, data, type, len);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
*dreg = reg;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_parse_register_store);
|
|
|
|
static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
|
|
[NFTA_VERDICT_CODE] = { .type = NLA_U32 },
|
|
[NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
|
|
.len = NFT_CHAIN_MAXNAMELEN - 1 },
|
|
[NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
|
|
struct nft_data_desc *desc, const struct nlattr *nla)
|
|
{
|
|
u8 genmask = nft_genmask_next(ctx->net);
|
|
struct nlattr *tb[NFTA_VERDICT_MAX + 1];
|
|
struct nft_chain *chain;
|
|
int err;
|
|
|
|
err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
|
|
nft_verdict_policy, NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (!tb[NFTA_VERDICT_CODE])
|
|
return -EINVAL;
|
|
|
|
/* zero padding hole for memcmp */
|
|
memset(data, 0, sizeof(*data));
|
|
data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
|
|
|
|
switch (data->verdict.code) {
|
|
default:
|
|
switch (data->verdict.code & NF_VERDICT_MASK) {
|
|
case NF_ACCEPT:
|
|
case NF_DROP:
|
|
case NF_QUEUE:
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
fallthrough;
|
|
case NFT_CONTINUE:
|
|
case NFT_BREAK:
|
|
case NFT_RETURN:
|
|
break;
|
|
case NFT_JUMP:
|
|
case NFT_GOTO:
|
|
if (tb[NFTA_VERDICT_CHAIN]) {
|
|
chain = nft_chain_lookup(ctx->net, ctx->table,
|
|
tb[NFTA_VERDICT_CHAIN],
|
|
genmask);
|
|
} else if (tb[NFTA_VERDICT_CHAIN_ID]) {
|
|
chain = nft_chain_lookup_byid(ctx->net, ctx->table,
|
|
tb[NFTA_VERDICT_CHAIN_ID],
|
|
genmask);
|
|
if (IS_ERR(chain))
|
|
return PTR_ERR(chain);
|
|
} else {
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (IS_ERR(chain))
|
|
return PTR_ERR(chain);
|
|
if (nft_is_base_chain(chain))
|
|
return -EOPNOTSUPP;
|
|
if (nft_chain_is_bound(chain))
|
|
return -EINVAL;
|
|
if (desc->flags & NFT_DATA_DESC_SETELEM &&
|
|
chain->flags & NFT_CHAIN_BINDING)
|
|
return -EINVAL;
|
|
if (!nft_use_inc(&chain->use))
|
|
return -EMFILE;
|
|
|
|
data->verdict.chain = chain;
|
|
break;
|
|
}
|
|
|
|
desc->len = sizeof(data->verdict);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void nft_verdict_uninit(const struct nft_data *data)
|
|
{
|
|
struct nft_chain *chain;
|
|
|
|
switch (data->verdict.code) {
|
|
case NFT_JUMP:
|
|
case NFT_GOTO:
|
|
chain = data->verdict.chain;
|
|
nft_use_dec(&chain->use);
|
|
break;
|
|
}
|
|
}
|
|
|
|
int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
|
|
{
|
|
struct nlattr *nest;
|
|
|
|
nest = nla_nest_start_noflag(skb, type);
|
|
if (!nest)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
|
|
goto nla_put_failure;
|
|
|
|
switch (v->code) {
|
|
case NFT_JUMP:
|
|
case NFT_GOTO:
|
|
if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
|
|
v->chain->name))
|
|
goto nla_put_failure;
|
|
}
|
|
nla_nest_end(skb, nest);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
static int nft_value_init(const struct nft_ctx *ctx,
|
|
struct nft_data *data, struct nft_data_desc *desc,
|
|
const struct nlattr *nla)
|
|
{
|
|
unsigned int len;
|
|
|
|
len = nla_len(nla);
|
|
if (len == 0)
|
|
return -EINVAL;
|
|
if (len > desc->size)
|
|
return -EOVERFLOW;
|
|
if (desc->len) {
|
|
if (len != desc->len)
|
|
return -EINVAL;
|
|
} else {
|
|
desc->len = len;
|
|
}
|
|
|
|
nla_memcpy(data->data, nla, len);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
|
|
unsigned int len)
|
|
{
|
|
return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
|
|
}
|
|
|
|
static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
|
|
[NFTA_DATA_VALUE] = { .type = NLA_BINARY },
|
|
[NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
|
|
};
|
|
|
|
/**
|
|
* nft_data_init - parse nf_tables data netlink attributes
|
|
*
|
|
* @ctx: context of the expression using the data
|
|
* @data: destination struct nft_data
|
|
* @desc: data description
|
|
* @nla: netlink attribute containing data
|
|
*
|
|
* Parse the netlink data attributes and initialize a struct nft_data.
|
|
* The type and length of data are returned in the data description.
|
|
*
|
|
* The caller can indicate that it only wants to accept data of type
|
|
* NFT_DATA_VALUE by passing NULL for the ctx argument.
|
|
*/
|
|
int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
|
|
struct nft_data_desc *desc, const struct nlattr *nla)
|
|
{
|
|
struct nlattr *tb[NFTA_DATA_MAX + 1];
|
|
int err;
|
|
|
|
if (WARN_ON_ONCE(!desc->size))
|
|
return -EINVAL;
|
|
|
|
err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
|
|
nft_data_policy, NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (tb[NFTA_DATA_VALUE]) {
|
|
if (desc->type != NFT_DATA_VALUE)
|
|
return -EINVAL;
|
|
|
|
err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
|
|
} else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
|
|
if (desc->type != NFT_DATA_VERDICT)
|
|
return -EINVAL;
|
|
|
|
err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
|
|
} else {
|
|
err = -EINVAL;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_data_init);
|
|
|
|
/**
|
|
* nft_data_release - release a nft_data item
|
|
*
|
|
* @data: struct nft_data to release
|
|
* @type: type of data
|
|
*
|
|
* Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
|
|
* all others need to be released by calling this function.
|
|
*/
|
|
void nft_data_release(const struct nft_data *data, enum nft_data_types type)
|
|
{
|
|
if (type < NFT_DATA_VERDICT)
|
|
return;
|
|
switch (type) {
|
|
case NFT_DATA_VERDICT:
|
|
return nft_verdict_uninit(data);
|
|
default:
|
|
WARN_ON(1);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_data_release);
|
|
|
|
int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
|
|
enum nft_data_types type, unsigned int len)
|
|
{
|
|
struct nlattr *nest;
|
|
int err;
|
|
|
|
nest = nla_nest_start_noflag(skb, attr);
|
|
if (nest == NULL)
|
|
return -1;
|
|
|
|
switch (type) {
|
|
case NFT_DATA_VALUE:
|
|
err = nft_value_dump(skb, data, len);
|
|
break;
|
|
case NFT_DATA_VERDICT:
|
|
err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
|
|
break;
|
|
default:
|
|
err = -EINVAL;
|
|
WARN_ON(1);
|
|
}
|
|
|
|
nla_nest_end(skb, nest);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nft_data_dump);
|
|
|
|
int __nft_release_basechain(struct nft_ctx *ctx)
|
|
{
|
|
struct nft_rule *rule, *nr;
|
|
|
|
if (WARN_ON(!nft_is_base_chain(ctx->chain)))
|
|
return 0;
|
|
|
|
nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
|
|
list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
|
|
list_del(&rule->list);
|
|
nft_use_dec(&ctx->chain->use);
|
|
nf_tables_rule_release(ctx, rule);
|
|
}
|
|
nft_chain_del(ctx->chain);
|
|
nft_use_dec(&ctx->table->use);
|
|
nf_tables_chain_destroy(ctx);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__nft_release_basechain);
|
|
|
|
static void __nft_release_hook(struct net *net, struct nft_table *table)
|
|
{
|
|
struct nft_flowtable *flowtable;
|
|
struct nft_chain *chain;
|
|
|
|
list_for_each_entry(chain, &table->chains, list)
|
|
__nf_tables_unregister_hook(net, table, chain, true);
|
|
list_for_each_entry(flowtable, &table->flowtables, list)
|
|
__nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
|
|
true);
|
|
}
|
|
|
|
static void __nft_release_hooks(struct net *net)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(net);
|
|
struct nft_table *table;
|
|
|
|
list_for_each_entry(table, &nft_net->tables, list) {
|
|
if (nft_table_has_owner(table))
|
|
continue;
|
|
|
|
__nft_release_hook(net, table);
|
|
}
|
|
}
|
|
|
|
static void __nft_release_table(struct net *net, struct nft_table *table)
|
|
{
|
|
struct nft_flowtable *flowtable, *nf;
|
|
struct nft_chain *chain, *nc;
|
|
struct nft_object *obj, *ne;
|
|
struct nft_rule *rule, *nr;
|
|
struct nft_set *set, *ns;
|
|
struct nft_ctx ctx = {
|
|
.net = net,
|
|
.family = NFPROTO_NETDEV,
|
|
};
|
|
|
|
ctx.family = table->family;
|
|
ctx.table = table;
|
|
list_for_each_entry(chain, &table->chains, list) {
|
|
if (nft_chain_is_bound(chain))
|
|
continue;
|
|
|
|
ctx.chain = chain;
|
|
list_for_each_entry_safe(rule, nr, &chain->rules, list) {
|
|
list_del(&rule->list);
|
|
nft_use_dec(&chain->use);
|
|
nf_tables_rule_release(&ctx, rule);
|
|
}
|
|
}
|
|
list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
|
|
list_del(&flowtable->list);
|
|
nft_use_dec(&table->use);
|
|
nf_tables_flowtable_destroy(flowtable);
|
|
}
|
|
list_for_each_entry_safe(set, ns, &table->sets, list) {
|
|
list_del(&set->list);
|
|
nft_use_dec(&table->use);
|
|
if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
|
|
nft_map_deactivate(&ctx, set);
|
|
|
|
nft_set_destroy(&ctx, set);
|
|
}
|
|
list_for_each_entry_safe(obj, ne, &table->objects, list) {
|
|
nft_obj_del(obj);
|
|
nft_use_dec(&table->use);
|
|
nft_obj_destroy(&ctx, obj);
|
|
}
|
|
list_for_each_entry_safe(chain, nc, &table->chains, list) {
|
|
ctx.chain = chain;
|
|
nft_chain_del(chain);
|
|
nft_use_dec(&table->use);
|
|
nf_tables_chain_destroy(&ctx);
|
|
}
|
|
nf_tables_table_destroy(&ctx);
|
|
}
|
|
|
|
static void __nft_release_tables(struct net *net)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(net);
|
|
struct nft_table *table, *nt;
|
|
|
|
list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
|
|
if (nft_table_has_owner(table))
|
|
continue;
|
|
|
|
list_del(&table->list);
|
|
|
|
__nft_release_table(net, table);
|
|
}
|
|
}
|
|
|
|
static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
|
|
void *ptr)
|
|
{
|
|
struct nft_table *table, *to_delete[8];
|
|
struct nftables_pernet *nft_net;
|
|
struct netlink_notify *n = ptr;
|
|
struct net *net = n->net;
|
|
unsigned int deleted;
|
|
bool restart = false;
|
|
unsigned int gc_seq;
|
|
|
|
if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
|
|
return NOTIFY_DONE;
|
|
|
|
nft_net = nft_pernet(net);
|
|
deleted = 0;
|
|
mutex_lock(&nft_net->commit_mutex);
|
|
|
|
gc_seq = nft_gc_seq_begin(nft_net);
|
|
|
|
if (!list_empty(&nf_tables_destroy_list))
|
|
nf_tables_trans_destroy_flush_work();
|
|
again:
|
|
list_for_each_entry(table, &nft_net->tables, list) {
|
|
if (nft_table_has_owner(table) &&
|
|
n->portid == table->nlpid) {
|
|
__nft_release_hook(net, table);
|
|
list_del_rcu(&table->list);
|
|
to_delete[deleted++] = table;
|
|
if (deleted >= ARRAY_SIZE(to_delete))
|
|
break;
|
|
}
|
|
}
|
|
if (deleted) {
|
|
restart = deleted >= ARRAY_SIZE(to_delete);
|
|
synchronize_rcu();
|
|
while (deleted)
|
|
__nft_release_table(net, to_delete[--deleted]);
|
|
|
|
if (restart)
|
|
goto again;
|
|
}
|
|
nft_gc_seq_end(nft_net, gc_seq);
|
|
|
|
mutex_unlock(&nft_net->commit_mutex);
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block nft_nl_notifier = {
|
|
.notifier_call = nft_rcv_nl_event,
|
|
};
|
|
|
|
static int __net_init nf_tables_init_net(struct net *net)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(net);
|
|
|
|
INIT_LIST_HEAD(&nft_net->tables);
|
|
INIT_LIST_HEAD(&nft_net->commit_list);
|
|
INIT_LIST_HEAD(&nft_net->binding_list);
|
|
INIT_LIST_HEAD(&nft_net->module_list);
|
|
INIT_LIST_HEAD(&nft_net->notify_list);
|
|
mutex_init(&nft_net->commit_mutex);
|
|
nft_net->base_seq = 1;
|
|
nft_net->gc_seq = 0;
|
|
nft_net->validate_state = NFT_VALIDATE_SKIP;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __net_exit nf_tables_pre_exit_net(struct net *net)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(net);
|
|
|
|
mutex_lock(&nft_net->commit_mutex);
|
|
__nft_release_hooks(net);
|
|
mutex_unlock(&nft_net->commit_mutex);
|
|
}
|
|
|
|
static void __net_exit nf_tables_exit_net(struct net *net)
|
|
{
|
|
struct nftables_pernet *nft_net = nft_pernet(net);
|
|
unsigned int gc_seq;
|
|
|
|
mutex_lock(&nft_net->commit_mutex);
|
|
|
|
gc_seq = nft_gc_seq_begin(nft_net);
|
|
|
|
if (!list_empty(&nft_net->commit_list) ||
|
|
!list_empty(&nft_net->module_list))
|
|
__nf_tables_abort(net, NFNL_ABORT_NONE);
|
|
|
|
__nft_release_tables(net);
|
|
|
|
nft_gc_seq_end(nft_net, gc_seq);
|
|
|
|
mutex_unlock(&nft_net->commit_mutex);
|
|
WARN_ON_ONCE(!list_empty(&nft_net->tables));
|
|
WARN_ON_ONCE(!list_empty(&nft_net->module_list));
|
|
WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
|
|
}
|
|
|
|
static void nf_tables_exit_batch(struct list_head *net_exit_list)
|
|
{
|
|
flush_work(&trans_gc_work);
|
|
}
|
|
|
|
static struct pernet_operations nf_tables_net_ops = {
|
|
.init = nf_tables_init_net,
|
|
.pre_exit = nf_tables_pre_exit_net,
|
|
.exit = nf_tables_exit_net,
|
|
.exit_batch = nf_tables_exit_batch,
|
|
.id = &nf_tables_net_id,
|
|
.size = sizeof(struct nftables_pernet),
|
|
};
|
|
|
|
static int __init nf_tables_module_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = register_pernet_subsys(&nf_tables_net_ops);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = nft_chain_filter_init();
|
|
if (err < 0)
|
|
goto err_chain_filter;
|
|
|
|
err = nf_tables_core_module_init();
|
|
if (err < 0)
|
|
goto err_core_module;
|
|
|
|
err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
|
|
if (err < 0)
|
|
goto err_netdev_notifier;
|
|
|
|
err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
|
|
if (err < 0)
|
|
goto err_rht_objname;
|
|
|
|
err = nft_offload_init();
|
|
if (err < 0)
|
|
goto err_offload;
|
|
|
|
err = netlink_register_notifier(&nft_nl_notifier);
|
|
if (err < 0)
|
|
goto err_netlink_notifier;
|
|
|
|
/* must be last */
|
|
err = nfnetlink_subsys_register(&nf_tables_subsys);
|
|
if (err < 0)
|
|
goto err_nfnl_subsys;
|
|
|
|
nft_chain_route_init();
|
|
|
|
return err;
|
|
|
|
err_nfnl_subsys:
|
|
netlink_unregister_notifier(&nft_nl_notifier);
|
|
err_netlink_notifier:
|
|
nft_offload_exit();
|
|
err_offload:
|
|
rhltable_destroy(&nft_objname_ht);
|
|
err_rht_objname:
|
|
unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
|
|
err_netdev_notifier:
|
|
nf_tables_core_module_exit();
|
|
err_core_module:
|
|
nft_chain_filter_fini();
|
|
err_chain_filter:
|
|
unregister_pernet_subsys(&nf_tables_net_ops);
|
|
return err;
|
|
}
|
|
|
|
static void __exit nf_tables_module_exit(void)
|
|
{
|
|
nfnetlink_subsys_unregister(&nf_tables_subsys);
|
|
netlink_unregister_notifier(&nft_nl_notifier);
|
|
nft_offload_exit();
|
|
unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
|
|
nft_chain_filter_fini();
|
|
nft_chain_route_fini();
|
|
unregister_pernet_subsys(&nf_tables_net_ops);
|
|
cancel_work_sync(&trans_gc_work);
|
|
cancel_work_sync(&trans_destroy_work);
|
|
rcu_barrier();
|
|
rhltable_destroy(&nft_objname_ht);
|
|
nf_tables_core_module_exit();
|
|
}
|
|
|
|
module_init(nf_tables_module_init);
|
|
module_exit(nf_tables_module_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
|
|
MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
|