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![Jakub Kicinski](/assets/img/avatar_default.png)
Pablo Neira Ayuso says: ==================== Netfilter/IPVS updates for net-next 1) Remove indirection and use nf_ct_get() instead from nfnetlink_log and nfnetlink_queue, from Florian Westphal. 2) Add weighted random twos choice least-connection scheduling for IPVS, from Darby Payne. 3) Add a __hash placeholder in the flow tuple structure to identify the field to be included in the rhashtable key hash calculation. 4) Add a new nft_parse_register_load() and nft_parse_register_store() to consolidate register load and store in the core. 5) Statify nft_parse_register() since it has no more module clients. 6) Remove redundant assignment in nft_cmp, from Colin Ian King. * git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next: netfilter: nftables: remove redundant assignment of variable err netfilter: nftables: statify nft_parse_register() netfilter: nftables: add nft_parse_register_store() and use it netfilter: nftables: add nft_parse_register_load() and use it netfilter: flowtable: add hash offset field to tuple ipvs: add weighted random twos choice algorithm netfilter: ctnetlink: remove get_ct indirection ==================== Link: https://lore.kernel.org/r/20210206015005.23037-1-pablo@netfilter.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
432 lines
10 KiB
C
432 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2015 Patrick McHardy <kaber@trash.net>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables_core.h>
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struct nft_dynset {
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struct nft_set *set;
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struct nft_set_ext_tmpl tmpl;
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enum nft_dynset_ops op:8;
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u8 sreg_key;
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u8 sreg_data;
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bool invert;
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bool expr;
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u8 num_exprs;
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u64 timeout;
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struct nft_expr *expr_array[NFT_SET_EXPR_MAX];
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struct nft_set_binding binding;
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};
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static int nft_dynset_expr_setup(const struct nft_dynset *priv,
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const struct nft_set_ext *ext)
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{
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struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
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struct nft_expr *expr;
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int i;
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for (i = 0; i < priv->num_exprs; i++) {
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expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
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if (nft_expr_clone(expr, priv->expr_array[i]) < 0)
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return -1;
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elem_expr->size += priv->expr_array[i]->ops->size;
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}
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return 0;
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}
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static void *nft_dynset_new(struct nft_set *set, const struct nft_expr *expr,
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struct nft_regs *regs)
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{
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const struct nft_dynset *priv = nft_expr_priv(expr);
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struct nft_set_ext *ext;
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u64 timeout;
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void *elem;
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if (!atomic_add_unless(&set->nelems, 1, set->size))
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return NULL;
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timeout = priv->timeout ? : set->timeout;
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elem = nft_set_elem_init(set, &priv->tmpl,
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®s->data[priv->sreg_key], NULL,
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®s->data[priv->sreg_data],
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timeout, 0, GFP_ATOMIC);
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if (elem == NULL)
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goto err1;
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ext = nft_set_elem_ext(set, elem);
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if (priv->num_exprs && nft_dynset_expr_setup(priv, ext) < 0)
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goto err2;
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return elem;
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err2:
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nft_set_elem_destroy(set, elem, false);
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err1:
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if (set->size)
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atomic_dec(&set->nelems);
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return NULL;
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}
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void nft_dynset_eval(const struct nft_expr *expr,
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struct nft_regs *regs, const struct nft_pktinfo *pkt)
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{
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const struct nft_dynset *priv = nft_expr_priv(expr);
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struct nft_set *set = priv->set;
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const struct nft_set_ext *ext;
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u64 timeout;
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if (priv->op == NFT_DYNSET_OP_DELETE) {
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set->ops->delete(set, ®s->data[priv->sreg_key]);
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return;
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}
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if (set->ops->update(set, ®s->data[priv->sreg_key], nft_dynset_new,
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expr, regs, &ext)) {
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if (priv->op == NFT_DYNSET_OP_UPDATE &&
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nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
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timeout = priv->timeout ? : set->timeout;
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*nft_set_ext_expiration(ext) = get_jiffies_64() + timeout;
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}
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nft_set_elem_update_expr(ext, regs, pkt);
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if (priv->invert)
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regs->verdict.code = NFT_BREAK;
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return;
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}
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if (!priv->invert)
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regs->verdict.code = NFT_BREAK;
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}
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static void nft_dynset_ext_add_expr(struct nft_dynset *priv)
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{
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u8 size = 0;
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int i;
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for (i = 0; i < priv->num_exprs; i++)
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size += priv->expr_array[i]->ops->size;
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nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_EXPRESSIONS,
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sizeof(struct nft_set_elem_expr) + size);
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}
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static struct nft_expr *
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nft_dynset_expr_alloc(const struct nft_ctx *ctx, const struct nft_set *set,
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const struct nlattr *attr, int pos)
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{
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struct nft_expr *expr;
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int err;
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expr = nft_set_elem_expr_alloc(ctx, set, attr);
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if (IS_ERR(expr))
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return expr;
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if (set->exprs[pos] && set->exprs[pos]->ops != expr->ops) {
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err = -EOPNOTSUPP;
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goto err_dynset_expr;
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}
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return expr;
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err_dynset_expr:
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nft_expr_destroy(ctx, expr);
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return ERR_PTR(err);
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}
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static const struct nla_policy nft_dynset_policy[NFTA_DYNSET_MAX + 1] = {
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[NFTA_DYNSET_SET_NAME] = { .type = NLA_STRING,
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.len = NFT_SET_MAXNAMELEN - 1 },
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[NFTA_DYNSET_SET_ID] = { .type = NLA_U32 },
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[NFTA_DYNSET_OP] = { .type = NLA_U32 },
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[NFTA_DYNSET_SREG_KEY] = { .type = NLA_U32 },
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[NFTA_DYNSET_SREG_DATA] = { .type = NLA_U32 },
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[NFTA_DYNSET_TIMEOUT] = { .type = NLA_U64 },
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[NFTA_DYNSET_EXPR] = { .type = NLA_NESTED },
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[NFTA_DYNSET_FLAGS] = { .type = NLA_U32 },
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[NFTA_DYNSET_EXPRESSIONS] = { .type = NLA_NESTED },
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};
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static int nft_dynset_init(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nlattr * const tb[])
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{
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struct nft_dynset *priv = nft_expr_priv(expr);
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u8 genmask = nft_genmask_next(ctx->net);
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struct nft_set *set;
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u64 timeout;
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int err, i;
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lockdep_assert_held(&ctx->net->nft.commit_mutex);
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if (tb[NFTA_DYNSET_SET_NAME] == NULL ||
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tb[NFTA_DYNSET_OP] == NULL ||
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tb[NFTA_DYNSET_SREG_KEY] == NULL)
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return -EINVAL;
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if (tb[NFTA_DYNSET_FLAGS]) {
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u32 flags = ntohl(nla_get_be32(tb[NFTA_DYNSET_FLAGS]));
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if (flags & ~(NFT_DYNSET_F_INV | NFT_DYNSET_F_EXPR))
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return -EOPNOTSUPP;
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if (flags & NFT_DYNSET_F_INV)
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priv->invert = true;
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if (flags & NFT_DYNSET_F_EXPR)
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priv->expr = true;
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}
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set = nft_set_lookup_global(ctx->net, ctx->table,
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tb[NFTA_DYNSET_SET_NAME],
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tb[NFTA_DYNSET_SET_ID], genmask);
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if (IS_ERR(set))
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return PTR_ERR(set);
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if (set->ops->update == NULL)
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return -EOPNOTSUPP;
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if (set->flags & NFT_SET_CONSTANT)
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return -EBUSY;
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priv->op = ntohl(nla_get_be32(tb[NFTA_DYNSET_OP]));
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switch (priv->op) {
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case NFT_DYNSET_OP_ADD:
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case NFT_DYNSET_OP_DELETE:
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break;
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case NFT_DYNSET_OP_UPDATE:
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if (!(set->flags & NFT_SET_TIMEOUT))
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return -EOPNOTSUPP;
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break;
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default:
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return -EOPNOTSUPP;
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}
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timeout = 0;
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if (tb[NFTA_DYNSET_TIMEOUT] != NULL) {
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if (!(set->flags & NFT_SET_TIMEOUT))
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return -EOPNOTSUPP;
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err = nf_msecs_to_jiffies64(tb[NFTA_DYNSET_TIMEOUT], &timeout);
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if (err)
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return err;
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}
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err = nft_parse_register_load(tb[NFTA_DYNSET_SREG_KEY], &priv->sreg_key,
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set->klen);
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if (err < 0)
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return err;
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if (tb[NFTA_DYNSET_SREG_DATA] != NULL) {
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if (!(set->flags & NFT_SET_MAP))
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return -EOPNOTSUPP;
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if (set->dtype == NFT_DATA_VERDICT)
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return -EOPNOTSUPP;
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err = nft_parse_register_load(tb[NFTA_DYNSET_SREG_DATA],
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&priv->sreg_data, set->dlen);
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if (err < 0)
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return err;
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} else if (set->flags & NFT_SET_MAP)
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return -EINVAL;
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if ((tb[NFTA_DYNSET_EXPR] || tb[NFTA_DYNSET_EXPRESSIONS]) &&
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!(set->flags & NFT_SET_EVAL))
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return -EINVAL;
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if (tb[NFTA_DYNSET_EXPR]) {
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struct nft_expr *dynset_expr;
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dynset_expr = nft_dynset_expr_alloc(ctx, set,
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tb[NFTA_DYNSET_EXPR], 0);
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if (IS_ERR(dynset_expr))
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return PTR_ERR(dynset_expr);
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priv->num_exprs++;
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priv->expr_array[0] = dynset_expr;
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if (set->num_exprs > 1 ||
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(set->num_exprs == 1 &&
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dynset_expr->ops != set->exprs[0]->ops)) {
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err = -EOPNOTSUPP;
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goto err_expr_free;
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}
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} else if (tb[NFTA_DYNSET_EXPRESSIONS]) {
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struct nft_expr *dynset_expr;
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struct nlattr *tmp;
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int left;
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if (!priv->expr)
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return -EINVAL;
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i = 0;
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nla_for_each_nested(tmp, tb[NFTA_DYNSET_EXPRESSIONS], left) {
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if (i == NFT_SET_EXPR_MAX) {
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err = -E2BIG;
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goto err_expr_free;
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}
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if (nla_type(tmp) != NFTA_LIST_ELEM) {
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err = -EINVAL;
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goto err_expr_free;
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}
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dynset_expr = nft_dynset_expr_alloc(ctx, set, tmp, i);
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if (IS_ERR(dynset_expr)) {
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err = PTR_ERR(dynset_expr);
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goto err_expr_free;
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}
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priv->expr_array[i] = dynset_expr;
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priv->num_exprs++;
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if (set->num_exprs &&
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dynset_expr->ops != set->exprs[i]->ops) {
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err = -EOPNOTSUPP;
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goto err_expr_free;
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}
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i++;
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}
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if (set->num_exprs && set->num_exprs != i) {
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err = -EOPNOTSUPP;
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goto err_expr_free;
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}
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} else if (set->num_exprs > 0) {
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err = nft_set_elem_expr_clone(ctx, set, priv->expr_array);
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if (err < 0)
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return err;
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priv->num_exprs = set->num_exprs;
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}
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nft_set_ext_prepare(&priv->tmpl);
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nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_KEY, set->klen);
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if (set->flags & NFT_SET_MAP)
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nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_DATA, set->dlen);
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if (priv->num_exprs)
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nft_dynset_ext_add_expr(priv);
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if (set->flags & NFT_SET_TIMEOUT) {
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if (timeout || set->timeout) {
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nft_set_ext_add(&priv->tmpl, NFT_SET_EXT_TIMEOUT);
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nft_set_ext_add(&priv->tmpl, NFT_SET_EXT_EXPIRATION);
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}
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}
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priv->timeout = timeout;
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err = nf_tables_bind_set(ctx, set, &priv->binding);
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if (err < 0)
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goto err_expr_free;
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if (set->size == 0)
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set->size = 0xffff;
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priv->set = set;
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return 0;
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err_expr_free:
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for (i = 0; i < priv->num_exprs; i++)
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nft_expr_destroy(ctx, priv->expr_array[i]);
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return err;
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}
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static void nft_dynset_deactivate(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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enum nft_trans_phase phase)
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{
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struct nft_dynset *priv = nft_expr_priv(expr);
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nf_tables_deactivate_set(ctx, priv->set, &priv->binding, phase);
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}
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static void nft_dynset_activate(const struct nft_ctx *ctx,
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const struct nft_expr *expr)
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{
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struct nft_dynset *priv = nft_expr_priv(expr);
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priv->set->use++;
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}
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static void nft_dynset_destroy(const struct nft_ctx *ctx,
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const struct nft_expr *expr)
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{
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struct nft_dynset *priv = nft_expr_priv(expr);
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int i;
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for (i = 0; i < priv->num_exprs; i++)
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nft_expr_destroy(ctx, priv->expr_array[i]);
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nf_tables_destroy_set(ctx, priv->set);
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}
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static int nft_dynset_dump(struct sk_buff *skb, const struct nft_expr *expr)
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{
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const struct nft_dynset *priv = nft_expr_priv(expr);
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u32 flags = priv->invert ? NFT_DYNSET_F_INV : 0;
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int i;
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if (nft_dump_register(skb, NFTA_DYNSET_SREG_KEY, priv->sreg_key))
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goto nla_put_failure;
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if (priv->set->flags & NFT_SET_MAP &&
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nft_dump_register(skb, NFTA_DYNSET_SREG_DATA, priv->sreg_data))
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goto nla_put_failure;
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if (nla_put_be32(skb, NFTA_DYNSET_OP, htonl(priv->op)))
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goto nla_put_failure;
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if (nla_put_string(skb, NFTA_DYNSET_SET_NAME, priv->set->name))
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goto nla_put_failure;
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if (nla_put_be64(skb, NFTA_DYNSET_TIMEOUT,
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nf_jiffies64_to_msecs(priv->timeout),
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NFTA_DYNSET_PAD))
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goto nla_put_failure;
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if (priv->set->num_exprs == 0) {
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if (priv->num_exprs == 1) {
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if (nft_expr_dump(skb, NFTA_DYNSET_EXPR,
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priv->expr_array[0]))
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goto nla_put_failure;
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} else if (priv->num_exprs > 1) {
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struct nlattr *nest;
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nest = nla_nest_start_noflag(skb, NFTA_DYNSET_EXPRESSIONS);
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if (!nest)
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goto nla_put_failure;
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for (i = 0; i < priv->num_exprs; i++) {
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if (nft_expr_dump(skb, NFTA_LIST_ELEM,
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priv->expr_array[i]))
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goto nla_put_failure;
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}
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nla_nest_end(skb, nest);
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}
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}
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if (nla_put_be32(skb, NFTA_DYNSET_FLAGS, htonl(flags)))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -1;
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}
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static const struct nft_expr_ops nft_dynset_ops = {
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.type = &nft_dynset_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_dynset)),
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.eval = nft_dynset_eval,
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.init = nft_dynset_init,
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.destroy = nft_dynset_destroy,
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.activate = nft_dynset_activate,
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.deactivate = nft_dynset_deactivate,
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.dump = nft_dynset_dump,
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};
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struct nft_expr_type nft_dynset_type __read_mostly = {
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.name = "dynset",
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.ops = &nft_dynset_ops,
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.policy = nft_dynset_policy,
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.maxattr = NFTA_DYNSET_MAX,
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.owner = THIS_MODULE,
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};
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