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![Pablo Neira Ayuso](/assets/img/avatar_default.png)
When removing a rule that jumps to chain and such chain in the same batch, this bogusly hits EBUSY. Add activate and deactivate operations to expression that can be called from the preparation and the commit/abort phases. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
1364 lines
36 KiB
C
1364 lines
36 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _NET_NF_TABLES_H
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#define _NET_NF_TABLES_H
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#include <linux/module.h>
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#include <linux/list.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/x_tables.h>
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#include <linux/netfilter/nf_tables.h>
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#include <linux/u64_stats_sync.h>
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#include <net/netfilter/nf_flow_table.h>
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#include <net/netlink.h>
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#define NFT_JUMP_STACK_SIZE 16
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struct nft_pktinfo {
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struct sk_buff *skb;
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bool tprot_set;
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u8 tprot;
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/* for x_tables compatibility */
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struct xt_action_param xt;
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};
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static inline struct net *nft_net(const struct nft_pktinfo *pkt)
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{
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return pkt->xt.state->net;
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}
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static inline unsigned int nft_hook(const struct nft_pktinfo *pkt)
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{
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return pkt->xt.state->hook;
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}
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static inline u8 nft_pf(const struct nft_pktinfo *pkt)
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{
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return pkt->xt.state->pf;
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}
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static inline const struct net_device *nft_in(const struct nft_pktinfo *pkt)
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{
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return pkt->xt.state->in;
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}
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static inline const struct net_device *nft_out(const struct nft_pktinfo *pkt)
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{
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return pkt->xt.state->out;
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}
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static inline void nft_set_pktinfo(struct nft_pktinfo *pkt,
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struct sk_buff *skb,
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const struct nf_hook_state *state)
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{
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pkt->skb = skb;
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pkt->xt.state = state;
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}
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static inline void nft_set_pktinfo_unspec(struct nft_pktinfo *pkt,
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struct sk_buff *skb)
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{
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pkt->tprot_set = false;
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pkt->tprot = 0;
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pkt->xt.thoff = 0;
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pkt->xt.fragoff = 0;
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}
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/**
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* struct nft_verdict - nf_tables verdict
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*
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* @code: nf_tables/netfilter verdict code
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* @chain: destination chain for NFT_JUMP/NFT_GOTO
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*/
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struct nft_verdict {
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u32 code;
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struct nft_chain *chain;
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};
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struct nft_data {
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union {
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u32 data[4];
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struct nft_verdict verdict;
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};
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} __attribute__((aligned(__alignof__(u64))));
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/**
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* struct nft_regs - nf_tables register set
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*
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* @data: data registers
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* @verdict: verdict register
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*
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* The first four data registers alias to the verdict register.
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*/
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struct nft_regs {
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union {
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u32 data[20];
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struct nft_verdict verdict;
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};
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};
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/* Store/load an u16 or u8 integer to/from the u32 data register.
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*
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* Note, when using concatenations, register allocation happens at 32-bit
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* level. So for store instruction, pad the rest part with zero to avoid
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* garbage values.
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*/
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static inline void nft_reg_store16(u32 *dreg, u16 val)
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{
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*dreg = 0;
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*(u16 *)dreg = val;
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}
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static inline void nft_reg_store8(u32 *dreg, u8 val)
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{
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*dreg = 0;
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*(u8 *)dreg = val;
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}
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static inline u16 nft_reg_load16(u32 *sreg)
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{
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return *(u16 *)sreg;
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}
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static inline u8 nft_reg_load8(u32 *sreg)
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{
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return *(u8 *)sreg;
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}
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static inline void nft_data_copy(u32 *dst, const struct nft_data *src,
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unsigned int len)
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{
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memcpy(dst, src, len);
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}
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static inline void nft_data_debug(const struct nft_data *data)
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{
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pr_debug("data[0]=%x data[1]=%x data[2]=%x data[3]=%x\n",
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data->data[0], data->data[1],
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data->data[2], data->data[3]);
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}
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/**
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* struct nft_ctx - nf_tables rule/set context
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*
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* @net: net namespace
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* @table: the table the chain is contained in
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* @chain: the chain the rule is contained in
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* @nla: netlink attributes
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* @portid: netlink portID of the original message
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* @seq: netlink sequence number
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* @family: protocol family
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* @report: notify via unicast netlink message
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*/
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struct nft_ctx {
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struct net *net;
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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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u32 portid;
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u32 seq;
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u8 family;
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bool report;
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};
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struct nft_data_desc {
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enum nft_data_types type;
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unsigned int len;
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};
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int nft_data_init(const struct nft_ctx *ctx,
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struct nft_data *data, unsigned int size,
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struct nft_data_desc *desc, const struct nlattr *nla);
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void nft_data_hold(const struct nft_data *data, enum nft_data_types type);
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void nft_data_release(const struct nft_data *data, enum nft_data_types type);
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int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
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enum nft_data_types type, unsigned int len);
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static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg)
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{
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return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE;
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}
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static inline enum nft_registers nft_type_to_reg(enum nft_data_types type)
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{
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return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE;
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}
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int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest);
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unsigned int nft_parse_register(const struct nlattr *attr);
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int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg);
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int nft_validate_register_load(enum nft_registers reg, unsigned int len);
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int nft_validate_register_store(const struct nft_ctx *ctx,
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enum nft_registers reg,
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const struct nft_data *data,
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enum nft_data_types type, unsigned int len);
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/**
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* struct nft_userdata - user defined data associated with an object
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*
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* @len: length of the data
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* @data: content
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*
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* The presence of user data is indicated in an object specific fashion,
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* so a length of zero can't occur and the value "len" indicates data
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* of length len + 1.
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*/
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struct nft_userdata {
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u8 len;
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unsigned char data[0];
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};
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/**
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* struct nft_set_elem - generic representation of set elements
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*
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* @key: element key
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* @priv: element private data and extensions
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*/
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struct nft_set_elem {
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union {
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u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
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struct nft_data val;
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} key;
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void *priv;
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};
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struct nft_set;
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struct nft_set_iter {
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u8 genmask;
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unsigned int count;
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unsigned int skip;
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int err;
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int (*fn)(const struct nft_ctx *ctx,
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struct nft_set *set,
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const struct nft_set_iter *iter,
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struct nft_set_elem *elem);
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};
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/**
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* struct nft_set_desc - description of set elements
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*
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* @klen: key length
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* @dlen: data length
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* @size: number of set elements
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*/
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struct nft_set_desc {
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unsigned int klen;
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unsigned int dlen;
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unsigned int size;
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};
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/**
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* enum nft_set_class - performance class
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*
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* @NFT_LOOKUP_O_1: constant, O(1)
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* @NFT_LOOKUP_O_LOG_N: logarithmic, O(log N)
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* @NFT_LOOKUP_O_N: linear, O(N)
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*/
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enum nft_set_class {
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NFT_SET_CLASS_O_1,
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NFT_SET_CLASS_O_LOG_N,
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NFT_SET_CLASS_O_N,
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};
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/**
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* struct nft_set_estimate - estimation of memory and performance
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* characteristics
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*
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* @size: required memory
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* @lookup: lookup performance class
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* @space: memory class
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*/
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struct nft_set_estimate {
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unsigned int size;
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enum nft_set_class lookup;
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enum nft_set_class space;
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};
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/**
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* struct nft_set_type - nf_tables set type
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*
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* @select_ops: function to select nft_set_ops
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* @ops: default ops, used when no select_ops functions is present
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* @list: used internally
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* @owner: module reference
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*/
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struct nft_set_type {
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const struct nft_set_ops *(*select_ops)(const struct nft_ctx *,
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const struct nft_set_desc *desc,
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u32 flags);
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const struct nft_set_ops *ops;
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struct list_head list;
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struct module *owner;
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};
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struct nft_set_ext;
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struct nft_expr;
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/**
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* struct nft_set_ops - nf_tables set operations
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*
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* @lookup: look up an element within the set
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* @insert: insert new element into set
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* @activate: activate new element in the next generation
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* @deactivate: lookup for element and deactivate it in the next generation
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* @flush: deactivate element in the next generation
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* @remove: remove element from set
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* @walk: iterate over all set elemeennts
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* @get: get set elements
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* @privsize: function to return size of set private data
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* @init: initialize private data of new set instance
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* @destroy: destroy private data of set instance
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* @elemsize: element private size
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* @features: features supported by the implementation
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*/
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struct nft_set_ops {
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bool (*lookup)(const struct net *net,
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const struct nft_set *set,
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const u32 *key,
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const struct nft_set_ext **ext);
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bool (*update)(struct nft_set *set,
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const u32 *key,
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void *(*new)(struct nft_set *,
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const struct nft_expr *,
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struct nft_regs *),
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const struct nft_expr *expr,
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struct nft_regs *regs,
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const struct nft_set_ext **ext);
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int (*insert)(const struct net *net,
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const struct nft_set *set,
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const struct nft_set_elem *elem,
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struct nft_set_ext **ext);
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void (*activate)(const struct net *net,
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const struct nft_set *set,
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const struct nft_set_elem *elem);
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void * (*deactivate)(const struct net *net,
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const struct nft_set *set,
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const struct nft_set_elem *elem);
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bool (*flush)(const struct net *net,
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const struct nft_set *set,
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void *priv);
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void (*remove)(const struct net *net,
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const struct nft_set *set,
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const struct nft_set_elem *elem);
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void (*walk)(const struct nft_ctx *ctx,
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struct nft_set *set,
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struct nft_set_iter *iter);
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void * (*get)(const struct net *net,
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const struct nft_set *set,
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const struct nft_set_elem *elem,
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unsigned int flags);
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unsigned int (*privsize)(const struct nlattr * const nla[],
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const struct nft_set_desc *desc);
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bool (*estimate)(const struct nft_set_desc *desc,
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u32 features,
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struct nft_set_estimate *est);
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int (*init)(const struct nft_set *set,
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const struct nft_set_desc *desc,
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const struct nlattr * const nla[]);
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void (*destroy)(const struct nft_set *set);
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unsigned int elemsize;
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u32 features;
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const struct nft_set_type *type;
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};
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int nft_register_set(struct nft_set_type *type);
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void nft_unregister_set(struct nft_set_type *type);
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/**
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* struct nft_set - nf_tables set instance
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*
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* @list: table set list node
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* @bindings: list of set bindings
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* @name: name of the set
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* @handle: unique handle of the set
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* @ktype: key type (numeric type defined by userspace, not used in the kernel)
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* @dtype: data type (verdict or numeric type defined by userspace)
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* @objtype: object type (see NFT_OBJECT_* definitions)
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* @size: maximum set size
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* @nelems: number of elements
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* @ndeact: number of deactivated elements queued for removal
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* @timeout: default timeout value in jiffies
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* @gc_int: garbage collection interval in msecs
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* @policy: set parameterization (see enum nft_set_policies)
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* @udlen: user data length
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* @udata: user data
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* @ops: set ops
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* @flags: set flags
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* @genmask: generation mask
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* @klen: key length
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* @dlen: data length
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* @data: private set data
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*/
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struct nft_set {
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struct list_head list;
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struct list_head bindings;
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char *name;
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u64 handle;
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u32 ktype;
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u32 dtype;
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u32 objtype;
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u32 size;
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atomic_t nelems;
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u32 ndeact;
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u64 timeout;
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u32 gc_int;
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u16 policy;
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u16 udlen;
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unsigned char *udata;
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/* runtime data below here */
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const struct nft_set_ops *ops ____cacheline_aligned;
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u16 flags:14,
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genmask:2;
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u8 klen;
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u8 dlen;
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unsigned char data[]
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__attribute__((aligned(__alignof__(u64))));
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};
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static inline bool nft_set_is_anonymous(const struct nft_set *set)
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{
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return set->flags & NFT_SET_ANONYMOUS;
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}
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static inline void *nft_set_priv(const struct nft_set *set)
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{
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return (void *)set->data;
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}
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static inline struct nft_set *nft_set_container_of(const void *priv)
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{
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return (void *)priv - offsetof(struct nft_set, data);
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}
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struct nft_set *nft_set_lookup_global(const struct net *net,
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const struct nft_table *table,
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const struct nlattr *nla_set_name,
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const struct nlattr *nla_set_id,
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u8 genmask);
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static inline unsigned long nft_set_gc_interval(const struct nft_set *set)
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{
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return set->gc_int ? msecs_to_jiffies(set->gc_int) : HZ;
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}
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/**
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* struct nft_set_binding - nf_tables set binding
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*
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* @list: set bindings list node
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* @chain: chain containing the rule bound to the set
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* @flags: set action flags
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*
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* A set binding contains all information necessary for validation
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* of new elements added to a bound set.
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*/
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struct nft_set_binding {
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struct list_head list;
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const struct nft_chain *chain;
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u32 flags;
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};
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int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
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struct nft_set_binding *binding);
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void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
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struct nft_set_binding *binding);
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/**
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* enum nft_set_extensions - set extension type IDs
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*
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* @NFT_SET_EXT_KEY: element key
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* @NFT_SET_EXT_DATA: mapping data
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* @NFT_SET_EXT_FLAGS: element flags
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* @NFT_SET_EXT_TIMEOUT: element timeout
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* @NFT_SET_EXT_EXPIRATION: element expiration time
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* @NFT_SET_EXT_USERDATA: user data associated with the element
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* @NFT_SET_EXT_EXPR: expression assiociated with the element
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* @NFT_SET_EXT_OBJREF: stateful object reference associated with element
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* @NFT_SET_EXT_NUM: number of extension types
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*/
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enum nft_set_extensions {
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NFT_SET_EXT_KEY,
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NFT_SET_EXT_DATA,
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NFT_SET_EXT_FLAGS,
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NFT_SET_EXT_TIMEOUT,
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NFT_SET_EXT_EXPIRATION,
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NFT_SET_EXT_USERDATA,
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NFT_SET_EXT_EXPR,
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NFT_SET_EXT_OBJREF,
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NFT_SET_EXT_NUM
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};
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/**
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* struct nft_set_ext_type - set extension type
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*
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* @len: fixed part length of the extension
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* @align: alignment requirements of the extension
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*/
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struct nft_set_ext_type {
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u8 len;
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u8 align;
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};
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extern const struct nft_set_ext_type nft_set_ext_types[];
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/**
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* struct nft_set_ext_tmpl - set extension template
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*
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* @len: length of extension area
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* @offset: offsets of individual extension types
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*/
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struct nft_set_ext_tmpl {
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u16 len;
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|
u8 offset[NFT_SET_EXT_NUM];
|
|
};
|
|
|
|
/**
|
|
* struct nft_set_ext - set extensions
|
|
*
|
|
* @genmask: generation mask
|
|
* @offset: offsets of individual extension types
|
|
* @data: beginning of extension data
|
|
*/
|
|
struct nft_set_ext {
|
|
u8 genmask;
|
|
u8 offset[NFT_SET_EXT_NUM];
|
|
char data[0];
|
|
};
|
|
|
|
static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl)
|
|
{
|
|
memset(tmpl, 0, sizeof(*tmpl));
|
|
tmpl->len = sizeof(struct nft_set_ext);
|
|
}
|
|
|
|
static inline void nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id,
|
|
unsigned int len)
|
|
{
|
|
tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align);
|
|
BUG_ON(tmpl->len > U8_MAX);
|
|
tmpl->offset[id] = tmpl->len;
|
|
tmpl->len += nft_set_ext_types[id].len + len;
|
|
}
|
|
|
|
static inline void nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id)
|
|
{
|
|
nft_set_ext_add_length(tmpl, id, 0);
|
|
}
|
|
|
|
static inline void nft_set_ext_init(struct nft_set_ext *ext,
|
|
const struct nft_set_ext_tmpl *tmpl)
|
|
{
|
|
memcpy(ext->offset, tmpl->offset, sizeof(ext->offset));
|
|
}
|
|
|
|
static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
|
|
{
|
|
return !!ext->offset[id];
|
|
}
|
|
|
|
static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
|
|
{
|
|
return ext && __nft_set_ext_exists(ext, id);
|
|
}
|
|
|
|
static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id)
|
|
{
|
|
return (void *)ext + ext->offset[id];
|
|
}
|
|
|
|
static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext)
|
|
{
|
|
return nft_set_ext(ext, NFT_SET_EXT_KEY);
|
|
}
|
|
|
|
static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext)
|
|
{
|
|
return nft_set_ext(ext, NFT_SET_EXT_DATA);
|
|
}
|
|
|
|
static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext)
|
|
{
|
|
return nft_set_ext(ext, NFT_SET_EXT_FLAGS);
|
|
}
|
|
|
|
static inline u64 *nft_set_ext_timeout(const struct nft_set_ext *ext)
|
|
{
|
|
return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT);
|
|
}
|
|
|
|
static inline unsigned long *nft_set_ext_expiration(const struct nft_set_ext *ext)
|
|
{
|
|
return nft_set_ext(ext, NFT_SET_EXT_EXPIRATION);
|
|
}
|
|
|
|
static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext)
|
|
{
|
|
return nft_set_ext(ext, NFT_SET_EXT_USERDATA);
|
|
}
|
|
|
|
static inline struct nft_expr *nft_set_ext_expr(const struct nft_set_ext *ext)
|
|
{
|
|
return nft_set_ext(ext, NFT_SET_EXT_EXPR);
|
|
}
|
|
|
|
static inline bool nft_set_elem_expired(const struct nft_set_ext *ext)
|
|
{
|
|
return nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION) &&
|
|
time_is_before_eq_jiffies(*nft_set_ext_expiration(ext));
|
|
}
|
|
|
|
static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set,
|
|
void *elem)
|
|
{
|
|
return elem + set->ops->elemsize;
|
|
}
|
|
|
|
static inline struct nft_object **nft_set_ext_obj(const struct nft_set_ext *ext)
|
|
{
|
|
return nft_set_ext(ext, NFT_SET_EXT_OBJREF);
|
|
}
|
|
|
|
void *nft_set_elem_init(const struct nft_set *set,
|
|
const struct nft_set_ext_tmpl *tmpl,
|
|
const u32 *key, const u32 *data,
|
|
u64 timeout, gfp_t gfp);
|
|
void nft_set_elem_destroy(const struct nft_set *set, void *elem,
|
|
bool destroy_expr);
|
|
|
|
/**
|
|
* struct nft_set_gc_batch_head - nf_tables set garbage collection batch
|
|
*
|
|
* @rcu: rcu head
|
|
* @set: set the elements belong to
|
|
* @cnt: count of elements
|
|
*/
|
|
struct nft_set_gc_batch_head {
|
|
struct rcu_head rcu;
|
|
const struct nft_set *set;
|
|
unsigned int cnt;
|
|
};
|
|
|
|
#define NFT_SET_GC_BATCH_SIZE ((PAGE_SIZE - \
|
|
sizeof(struct nft_set_gc_batch_head)) / \
|
|
sizeof(void *))
|
|
|
|
/**
|
|
* struct nft_set_gc_batch - nf_tables set garbage collection batch
|
|
*
|
|
* @head: GC batch head
|
|
* @elems: garbage collection elements
|
|
*/
|
|
struct nft_set_gc_batch {
|
|
struct nft_set_gc_batch_head head;
|
|
void *elems[NFT_SET_GC_BATCH_SIZE];
|
|
};
|
|
|
|
struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
|
|
gfp_t gfp);
|
|
void nft_set_gc_batch_release(struct rcu_head *rcu);
|
|
|
|
static inline void nft_set_gc_batch_complete(struct nft_set_gc_batch *gcb)
|
|
{
|
|
if (gcb != NULL)
|
|
call_rcu(&gcb->head.rcu, nft_set_gc_batch_release);
|
|
}
|
|
|
|
static inline struct nft_set_gc_batch *
|
|
nft_set_gc_batch_check(const struct nft_set *set, struct nft_set_gc_batch *gcb,
|
|
gfp_t gfp)
|
|
{
|
|
if (gcb != NULL) {
|
|
if (gcb->head.cnt + 1 < ARRAY_SIZE(gcb->elems))
|
|
return gcb;
|
|
nft_set_gc_batch_complete(gcb);
|
|
}
|
|
return nft_set_gc_batch_alloc(set, gfp);
|
|
}
|
|
|
|
static inline void nft_set_gc_batch_add(struct nft_set_gc_batch *gcb,
|
|
void *elem)
|
|
{
|
|
gcb->elems[gcb->head.cnt++] = elem;
|
|
}
|
|
|
|
/**
|
|
* struct nft_expr_type - nf_tables expression type
|
|
*
|
|
* @select_ops: function to select nft_expr_ops
|
|
* @ops: default ops, used when no select_ops functions is present
|
|
* @list: used internally
|
|
* @name: Identifier
|
|
* @owner: module reference
|
|
* @policy: netlink attribute policy
|
|
* @maxattr: highest netlink attribute number
|
|
* @family: address family for AF-specific types
|
|
* @flags: expression type flags
|
|
*/
|
|
struct nft_expr_type {
|
|
const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *,
|
|
const struct nlattr * const tb[]);
|
|
const struct nft_expr_ops *ops;
|
|
struct list_head list;
|
|
const char *name;
|
|
struct module *owner;
|
|
const struct nla_policy *policy;
|
|
unsigned int maxattr;
|
|
u8 family;
|
|
u8 flags;
|
|
};
|
|
|
|
#define NFT_EXPR_STATEFUL 0x1
|
|
|
|
/**
|
|
* struct nft_expr_ops - nf_tables expression operations
|
|
*
|
|
* @eval: Expression evaluation function
|
|
* @size: full expression size, including private data size
|
|
* @init: initialization function
|
|
* @destroy: destruction function
|
|
* @dump: function to dump parameters
|
|
* @type: expression type
|
|
* @validate: validate expression, called during loop detection
|
|
* @data: extra data to attach to this expression operation
|
|
*/
|
|
struct nft_expr;
|
|
struct nft_expr_ops {
|
|
void (*eval)(const struct nft_expr *expr,
|
|
struct nft_regs *regs,
|
|
const struct nft_pktinfo *pkt);
|
|
int (*clone)(struct nft_expr *dst,
|
|
const struct nft_expr *src);
|
|
unsigned int size;
|
|
|
|
int (*init)(const struct nft_ctx *ctx,
|
|
const struct nft_expr *expr,
|
|
const struct nlattr * const tb[]);
|
|
void (*activate)(const struct nft_ctx *ctx,
|
|
const struct nft_expr *expr);
|
|
void (*deactivate)(const struct nft_ctx *ctx,
|
|
const struct nft_expr *expr);
|
|
void (*destroy)(const struct nft_ctx *ctx,
|
|
const struct nft_expr *expr);
|
|
int (*dump)(struct sk_buff *skb,
|
|
const struct nft_expr *expr);
|
|
int (*validate)(const struct nft_ctx *ctx,
|
|
const struct nft_expr *expr,
|
|
const struct nft_data **data);
|
|
const struct nft_expr_type *type;
|
|
void *data;
|
|
};
|
|
|
|
#define NFT_EXPR_MAXATTR 16
|
|
#define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \
|
|
ALIGN(size, __alignof__(struct nft_expr)))
|
|
|
|
/**
|
|
* struct nft_expr - nf_tables expression
|
|
*
|
|
* @ops: expression ops
|
|
* @data: expression private data
|
|
*/
|
|
struct nft_expr {
|
|
const struct nft_expr_ops *ops;
|
|
unsigned char data[];
|
|
};
|
|
|
|
static inline void *nft_expr_priv(const struct nft_expr *expr)
|
|
{
|
|
return (void *)expr->data;
|
|
}
|
|
|
|
struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
|
|
const struct nlattr *nla);
|
|
void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr);
|
|
int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
|
|
const struct nft_expr *expr);
|
|
|
|
static inline 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;
|
|
}
|
|
|
|
/**
|
|
* struct nft_rule - nf_tables rule
|
|
*
|
|
* @list: used internally
|
|
* @handle: rule handle
|
|
* @genmask: generation mask
|
|
* @dlen: length of expression data
|
|
* @udata: user data is appended to the rule
|
|
* @data: expression data
|
|
*/
|
|
struct nft_rule {
|
|
struct list_head list;
|
|
u64 handle:42,
|
|
genmask:2,
|
|
dlen:12,
|
|
udata:1;
|
|
unsigned char data[]
|
|
__attribute__((aligned(__alignof__(struct nft_expr))));
|
|
};
|
|
|
|
static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule)
|
|
{
|
|
return (struct nft_expr *)&rule->data[0];
|
|
}
|
|
|
|
static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr)
|
|
{
|
|
return ((void *)expr) + expr->ops->size;
|
|
}
|
|
|
|
static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule)
|
|
{
|
|
return (struct nft_expr *)&rule->data[rule->dlen];
|
|
}
|
|
|
|
static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule)
|
|
{
|
|
return (void *)&rule->data[rule->dlen];
|
|
}
|
|
|
|
/*
|
|
* The last pointer isn't really necessary, but the compiler isn't able to
|
|
* determine that the result of nft_expr_last() is always the same since it
|
|
* can't assume that the dlen value wasn't changed within calls in the loop.
|
|
*/
|
|
#define nft_rule_for_each_expr(expr, last, rule) \
|
|
for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \
|
|
(expr) != (last); \
|
|
(expr) = nft_expr_next(expr))
|
|
|
|
enum nft_chain_flags {
|
|
NFT_BASE_CHAIN = 0x1,
|
|
};
|
|
|
|
/**
|
|
* struct nft_chain - nf_tables chain
|
|
*
|
|
* @rules: list of rules in the chain
|
|
* @list: used internally
|
|
* @table: table that this chain belongs to
|
|
* @handle: chain handle
|
|
* @use: number of jump references to this chain
|
|
* @level: length of longest path to this chain
|
|
* @flags: bitmask of enum nft_chain_flags
|
|
* @name: name of the chain
|
|
*/
|
|
struct nft_chain {
|
|
struct list_head rules;
|
|
struct list_head list;
|
|
struct nft_table *table;
|
|
u64 handle;
|
|
u32 use;
|
|
u16 level;
|
|
u8 flags:6,
|
|
genmask:2;
|
|
char *name;
|
|
};
|
|
|
|
enum nft_chain_types {
|
|
NFT_CHAIN_T_DEFAULT = 0,
|
|
NFT_CHAIN_T_ROUTE,
|
|
NFT_CHAIN_T_NAT,
|
|
NFT_CHAIN_T_MAX
|
|
};
|
|
|
|
/**
|
|
* struct nft_chain_type - nf_tables chain type info
|
|
*
|
|
* @name: name of the type
|
|
* @type: numeric identifier
|
|
* @family: address family
|
|
* @owner: module owner
|
|
* @hook_mask: mask of valid hooks
|
|
* @hooks: array of hook functions
|
|
* @init: chain initialization function
|
|
* @free: chain release function
|
|
*/
|
|
struct nft_chain_type {
|
|
const char *name;
|
|
enum nft_chain_types type;
|
|
int family;
|
|
struct module *owner;
|
|
unsigned int hook_mask;
|
|
nf_hookfn *hooks[NF_MAX_HOOKS];
|
|
int (*init)(struct nft_ctx *ctx);
|
|
void (*free)(struct nft_ctx *ctx);
|
|
};
|
|
|
|
int nft_chain_validate_dependency(const struct nft_chain *chain,
|
|
enum nft_chain_types type);
|
|
int nft_chain_validate_hooks(const struct nft_chain *chain,
|
|
unsigned int hook_flags);
|
|
|
|
struct nft_stats {
|
|
u64 bytes;
|
|
u64 pkts;
|
|
struct u64_stats_sync syncp;
|
|
};
|
|
|
|
/**
|
|
* struct nft_base_chain - nf_tables base chain
|
|
*
|
|
* @ops: netfilter hook ops
|
|
* @type: chain type
|
|
* @policy: default policy
|
|
* @stats: per-cpu chain stats
|
|
* @chain: the chain
|
|
* @dev_name: device name that this base chain is attached to (if any)
|
|
*/
|
|
struct nft_base_chain {
|
|
struct nf_hook_ops ops;
|
|
const struct nft_chain_type *type;
|
|
u8 policy;
|
|
u8 flags;
|
|
struct nft_stats __percpu *stats;
|
|
struct nft_chain chain;
|
|
char dev_name[IFNAMSIZ];
|
|
};
|
|
|
|
static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain)
|
|
{
|
|
return container_of(chain, struct nft_base_chain, chain);
|
|
}
|
|
|
|
static inline bool nft_is_base_chain(const struct nft_chain *chain)
|
|
{
|
|
return chain->flags & NFT_BASE_CHAIN;
|
|
}
|
|
|
|
int __nft_release_basechain(struct nft_ctx *ctx);
|
|
|
|
unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv);
|
|
|
|
/**
|
|
* struct nft_table - nf_tables table
|
|
*
|
|
* @list: used internally
|
|
* @chains: chains in the table
|
|
* @sets: sets in the table
|
|
* @objects: stateful objects in the table
|
|
* @flowtables: flow tables in the table
|
|
* @hgenerator: handle generator state
|
|
* @handle: table handle
|
|
* @use: number of chain references to this table
|
|
* @flags: table flag (see enum nft_table_flags)
|
|
* @genmask: generation mask
|
|
* @afinfo: address family info
|
|
* @name: name of the table
|
|
*/
|
|
struct nft_table {
|
|
struct list_head list;
|
|
struct list_head chains;
|
|
struct list_head sets;
|
|
struct list_head objects;
|
|
struct list_head flowtables;
|
|
u64 hgenerator;
|
|
u64 handle;
|
|
u32 use;
|
|
u16 family:6,
|
|
flags:8,
|
|
genmask:2;
|
|
char *name;
|
|
};
|
|
|
|
void nft_register_chain_type(const struct nft_chain_type *);
|
|
void nft_unregister_chain_type(const struct nft_chain_type *);
|
|
|
|
int nft_register_expr(struct nft_expr_type *);
|
|
void nft_unregister_expr(struct nft_expr_type *);
|
|
|
|
int nft_verdict_dump(struct sk_buff *skb, int type,
|
|
const struct nft_verdict *v);
|
|
|
|
/**
|
|
* struct nft_object - nf_tables stateful object
|
|
*
|
|
* @list: table stateful object list node
|
|
* @table: table this object belongs to
|
|
* @name: name of this stateful object
|
|
* @genmask: generation mask
|
|
* @use: number of references to this stateful object
|
|
* @handle: unique object handle
|
|
* @ops: object operations
|
|
* @data: object data, layout depends on type
|
|
*/
|
|
struct nft_object {
|
|
struct list_head list;
|
|
char *name;
|
|
struct nft_table *table;
|
|
u32 genmask:2,
|
|
use:30;
|
|
u64 handle;
|
|
/* runtime data below here */
|
|
const struct nft_object_ops *ops ____cacheline_aligned;
|
|
unsigned char data[]
|
|
__attribute__((aligned(__alignof__(u64))));
|
|
};
|
|
|
|
static inline void *nft_obj_data(const struct nft_object *obj)
|
|
{
|
|
return (void *)obj->data;
|
|
}
|
|
|
|
#define nft_expr_obj(expr) *((struct nft_object **)nft_expr_priv(expr))
|
|
|
|
struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
|
|
const struct nlattr *nla, u32 objtype,
|
|
u8 genmask);
|
|
|
|
void nft_obj_notify(struct net *net, struct nft_table *table,
|
|
struct nft_object *obj, u32 portid, u32 seq,
|
|
int event, int family, int report, gfp_t gfp);
|
|
|
|
/**
|
|
* struct nft_object_type - stateful object type
|
|
*
|
|
* @select_ops: function to select nft_object_ops
|
|
* @ops: default ops, used when no select_ops functions is present
|
|
* @list: list node in list of object types
|
|
* @type: stateful object numeric type
|
|
* @owner: module owner
|
|
* @maxattr: maximum netlink attribute
|
|
* @policy: netlink attribute policy
|
|
*/
|
|
struct nft_object_type {
|
|
const struct nft_object_ops *(*select_ops)(const struct nft_ctx *,
|
|
const struct nlattr * const tb[]);
|
|
const struct nft_object_ops *ops;
|
|
struct list_head list;
|
|
u32 type;
|
|
unsigned int maxattr;
|
|
struct module *owner;
|
|
const struct nla_policy *policy;
|
|
};
|
|
|
|
/**
|
|
* struct nft_object_ops - stateful object operations
|
|
*
|
|
* @eval: stateful object evaluation function
|
|
* @size: stateful object size
|
|
* @init: initialize object from netlink attributes
|
|
* @destroy: release existing stateful object
|
|
* @dump: netlink dump stateful object
|
|
*/
|
|
struct nft_object_ops {
|
|
void (*eval)(struct nft_object *obj,
|
|
struct nft_regs *regs,
|
|
const struct nft_pktinfo *pkt);
|
|
unsigned int size;
|
|
int (*init)(const struct nft_ctx *ctx,
|
|
const struct nlattr *const tb[],
|
|
struct nft_object *obj);
|
|
void (*destroy)(struct nft_object *obj);
|
|
int (*dump)(struct sk_buff *skb,
|
|
struct nft_object *obj,
|
|
bool reset);
|
|
const struct nft_object_type *type;
|
|
};
|
|
|
|
int nft_register_obj(struct nft_object_type *obj_type);
|
|
void nft_unregister_obj(struct nft_object_type *obj_type);
|
|
|
|
#define NFT_FLOWTABLE_DEVICE_MAX 8
|
|
|
|
/**
|
|
* struct nft_flowtable - nf_tables flow table
|
|
*
|
|
* @list: flow table list node in table list
|
|
* @table: the table the flow table is contained in
|
|
* @name: name of this flow table
|
|
* @hooknum: hook number
|
|
* @priority: hook priority
|
|
* @ops_len: number of hooks in array
|
|
* @genmask: generation mask
|
|
* @use: number of references to this flow table
|
|
* @handle: unique object handle
|
|
* @dev_name: array of device names
|
|
* @data: rhashtable and garbage collector
|
|
* @ops: array of hooks
|
|
*/
|
|
struct nft_flowtable {
|
|
struct list_head list;
|
|
struct nft_table *table;
|
|
char *name;
|
|
int hooknum;
|
|
int priority;
|
|
int ops_len;
|
|
u32 genmask:2,
|
|
use:30;
|
|
u64 handle;
|
|
char *dev_name[NFT_FLOWTABLE_DEVICE_MAX];
|
|
/* runtime data below here */
|
|
struct nf_hook_ops *ops ____cacheline_aligned;
|
|
struct nf_flowtable data;
|
|
};
|
|
|
|
struct nft_flowtable *nf_tables_flowtable_lookup(const struct nft_table *table,
|
|
const struct nlattr *nla,
|
|
u8 genmask);
|
|
void nft_flow_table_iterate(struct net *net,
|
|
void (*iter)(struct nf_flowtable *flowtable, void *data),
|
|
void *data);
|
|
|
|
void nft_register_flowtable_type(struct nf_flowtable_type *type);
|
|
void nft_unregister_flowtable_type(struct nf_flowtable_type *type);
|
|
|
|
/**
|
|
* struct nft_traceinfo - nft tracing information and state
|
|
*
|
|
* @pkt: pktinfo currently processed
|
|
* @basechain: base chain currently processed
|
|
* @chain: chain currently processed
|
|
* @rule: rule that was evaluated
|
|
* @verdict: verdict given by rule
|
|
* @type: event type (enum nft_trace_types)
|
|
* @packet_dumped: packet headers sent in a previous traceinfo message
|
|
* @trace: other struct members are initialised
|
|
*/
|
|
struct nft_traceinfo {
|
|
const struct nft_pktinfo *pkt;
|
|
const struct nft_base_chain *basechain;
|
|
const struct nft_chain *chain;
|
|
const struct nft_rule *rule;
|
|
const struct nft_verdict *verdict;
|
|
enum nft_trace_types type;
|
|
bool packet_dumped;
|
|
bool trace;
|
|
};
|
|
|
|
void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt,
|
|
const struct nft_verdict *verdict,
|
|
const struct nft_chain *basechain);
|
|
|
|
void nft_trace_notify(struct nft_traceinfo *info);
|
|
|
|
#define MODULE_ALIAS_NFT_CHAIN(family, name) \
|
|
MODULE_ALIAS("nft-chain-" __stringify(family) "-" name)
|
|
|
|
#define MODULE_ALIAS_NFT_AF_EXPR(family, name) \
|
|
MODULE_ALIAS("nft-expr-" __stringify(family) "-" name)
|
|
|
|
#define MODULE_ALIAS_NFT_EXPR(name) \
|
|
MODULE_ALIAS("nft-expr-" name)
|
|
|
|
#define MODULE_ALIAS_NFT_SET() \
|
|
MODULE_ALIAS("nft-set")
|
|
|
|
#define MODULE_ALIAS_NFT_OBJ(type) \
|
|
MODULE_ALIAS("nft-obj-" __stringify(type))
|
|
|
|
/*
|
|
* The gencursor defines two generations, the currently active and the
|
|
* next one. Objects contain a bitmask of 2 bits specifying the generations
|
|
* they're active in. A set bit means they're inactive in the generation
|
|
* represented by that bit.
|
|
*
|
|
* New objects start out as inactive in the current and active in the
|
|
* next generation. When committing the ruleset the bitmask is cleared,
|
|
* meaning they're active in all generations. When removing an object,
|
|
* it is set inactive in the next generation. After committing the ruleset,
|
|
* the objects are removed.
|
|
*/
|
|
static inline unsigned int nft_gencursor_next(const struct net *net)
|
|
{
|
|
return net->nft.gencursor + 1 == 1 ? 1 : 0;
|
|
}
|
|
|
|
static inline u8 nft_genmask_next(const struct net *net)
|
|
{
|
|
return 1 << nft_gencursor_next(net);
|
|
}
|
|
|
|
static inline u8 nft_genmask_cur(const struct net *net)
|
|
{
|
|
/* Use READ_ONCE() to prevent refetching the value for atomicity */
|
|
return 1 << READ_ONCE(net->nft.gencursor);
|
|
}
|
|
|
|
#define NFT_GENMASK_ANY ((1 << 0) | (1 << 1))
|
|
|
|
/*
|
|
* Generic transaction helpers
|
|
*/
|
|
|
|
/* Check if this object is currently active. */
|
|
#define nft_is_active(__net, __obj) \
|
|
(((__obj)->genmask & nft_genmask_cur(__net)) == 0)
|
|
|
|
/* Check if this object is active in the next generation. */
|
|
#define nft_is_active_next(__net, __obj) \
|
|
(((__obj)->genmask & nft_genmask_next(__net)) == 0)
|
|
|
|
/* This object becomes active in the next generation. */
|
|
#define nft_activate_next(__net, __obj) \
|
|
(__obj)->genmask = nft_genmask_cur(__net)
|
|
|
|
/* This object becomes inactive in the next generation. */
|
|
#define nft_deactivate_next(__net, __obj) \
|
|
(__obj)->genmask = nft_genmask_next(__net)
|
|
|
|
/* After committing the ruleset, clear the stale generation bit. */
|
|
#define nft_clear(__net, __obj) \
|
|
(__obj)->genmask &= ~nft_genmask_next(__net)
|
|
#define nft_active_genmask(__obj, __genmask) \
|
|
!((__obj)->genmask & __genmask)
|
|
|
|
/*
|
|
* Set element transaction helpers
|
|
*/
|
|
|
|
static inline bool nft_set_elem_active(const struct nft_set_ext *ext,
|
|
u8 genmask)
|
|
{
|
|
return !(ext->genmask & genmask);
|
|
}
|
|
|
|
static inline void nft_set_elem_change_active(const struct net *net,
|
|
const struct nft_set *set,
|
|
struct nft_set_ext *ext)
|
|
{
|
|
ext->genmask ^= nft_genmask_next(net);
|
|
}
|
|
|
|
/*
|
|
* We use a free bit in the genmask field to indicate the element
|
|
* is busy, meaning it is currently being processed either by
|
|
* the netlink API or GC.
|
|
*
|
|
* Even though the genmask is only a single byte wide, this works
|
|
* because the extension structure if fully constant once initialized,
|
|
* so there are no non-atomic write accesses unless it is already
|
|
* marked busy.
|
|
*/
|
|
#define NFT_SET_ELEM_BUSY_MASK (1 << 2)
|
|
|
|
#if defined(__LITTLE_ENDIAN_BITFIELD)
|
|
#define NFT_SET_ELEM_BUSY_BIT 2
|
|
#elif defined(__BIG_ENDIAN_BITFIELD)
|
|
#define NFT_SET_ELEM_BUSY_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2)
|
|
#else
|
|
#error
|
|
#endif
|
|
|
|
static inline int nft_set_elem_mark_busy(struct nft_set_ext *ext)
|
|
{
|
|
unsigned long *word = (unsigned long *)ext;
|
|
|
|
BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0);
|
|
return test_and_set_bit(NFT_SET_ELEM_BUSY_BIT, word);
|
|
}
|
|
|
|
static inline void nft_set_elem_clear_busy(struct nft_set_ext *ext)
|
|
{
|
|
unsigned long *word = (unsigned long *)ext;
|
|
|
|
clear_bit(NFT_SET_ELEM_BUSY_BIT, word);
|
|
}
|
|
|
|
/**
|
|
* struct nft_trans - nf_tables object update in transaction
|
|
*
|
|
* @list: used internally
|
|
* @msg_type: message type
|
|
* @ctx: transaction context
|
|
* @data: internal information related to the transaction
|
|
*/
|
|
struct nft_trans {
|
|
struct list_head list;
|
|
int msg_type;
|
|
struct nft_ctx ctx;
|
|
char data[0];
|
|
};
|
|
|
|
struct nft_trans_rule {
|
|
struct nft_rule *rule;
|
|
u32 rule_id;
|
|
};
|
|
|
|
#define nft_trans_rule(trans) \
|
|
(((struct nft_trans_rule *)trans->data)->rule)
|
|
#define nft_trans_rule_id(trans) \
|
|
(((struct nft_trans_rule *)trans->data)->rule_id)
|
|
|
|
struct nft_trans_set {
|
|
struct nft_set *set;
|
|
u32 set_id;
|
|
};
|
|
|
|
#define nft_trans_set(trans) \
|
|
(((struct nft_trans_set *)trans->data)->set)
|
|
#define nft_trans_set_id(trans) \
|
|
(((struct nft_trans_set *)trans->data)->set_id)
|
|
|
|
struct nft_trans_chain {
|
|
bool update;
|
|
char *name;
|
|
struct nft_stats __percpu *stats;
|
|
u8 policy;
|
|
};
|
|
|
|
#define nft_trans_chain_update(trans) \
|
|
(((struct nft_trans_chain *)trans->data)->update)
|
|
#define nft_trans_chain_name(trans) \
|
|
(((struct nft_trans_chain *)trans->data)->name)
|
|
#define nft_trans_chain_stats(trans) \
|
|
(((struct nft_trans_chain *)trans->data)->stats)
|
|
#define nft_trans_chain_policy(trans) \
|
|
(((struct nft_trans_chain *)trans->data)->policy)
|
|
|
|
struct nft_trans_table {
|
|
bool update;
|
|
bool enable;
|
|
};
|
|
|
|
#define nft_trans_table_update(trans) \
|
|
(((struct nft_trans_table *)trans->data)->update)
|
|
#define nft_trans_table_enable(trans) \
|
|
(((struct nft_trans_table *)trans->data)->enable)
|
|
|
|
struct nft_trans_elem {
|
|
struct nft_set *set;
|
|
struct nft_set_elem elem;
|
|
};
|
|
|
|
#define nft_trans_elem_set(trans) \
|
|
(((struct nft_trans_elem *)trans->data)->set)
|
|
#define nft_trans_elem(trans) \
|
|
(((struct nft_trans_elem *)trans->data)->elem)
|
|
|
|
struct nft_trans_obj {
|
|
struct nft_object *obj;
|
|
};
|
|
|
|
#define nft_trans_obj(trans) \
|
|
(((struct nft_trans_obj *)trans->data)->obj)
|
|
|
|
struct nft_trans_flowtable {
|
|
struct nft_flowtable *flowtable;
|
|
};
|
|
|
|
#define nft_trans_flowtable(trans) \
|
|
(((struct nft_trans_flowtable *)trans->data)->flowtable)
|
|
|
|
int __init nft_chain_filter_init(void);
|
|
void __exit nft_chain_filter_fini(void);
|
|
|
|
#endif /* _NET_NF_TABLES_H */
|