/* 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 <asm/unaligned.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 <linux/rhashtable.h>
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#include <net/netfilter/nf_flow_table.h>
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#include <net/netlink.h>
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#include <net/flow_offload.h>
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#define NFT_MAX_HOOKS (NF_INET_INGRESS + 1)
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struct module;
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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 u8, u16 or u64 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_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 u8 nft_reg_load8(const 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_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 u16 nft_reg_load16(const u32 *sreg)
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{
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return *(u16 *)sreg;
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}
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static inline void nft_reg_store64(u32 *dreg, u64 val)
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{
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put_unaligned(val, (u64 *)dreg);
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}
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static inline u64 nft_reg_load64(const u32 *sreg)
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{
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return get_unaligned((u64 *)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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if (len % NFT_REG32_SIZE)
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dst[len / NFT_REG32_SIZE] = 0;
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memcpy(dst, src, len);
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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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* @level: depth of the chains
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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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u16 flags;
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u8 family;
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u8 level;
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bool report;
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};
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enum nft_data_desc_flags {
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NFT_DATA_DESC_SETELEM = (1 << 0),
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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 size;
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unsigned int len;
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unsigned int flags;
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};
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int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
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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_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len);
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int nft_parse_register_store(const struct nft_ctx *ctx,
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const struct nlattr *attr, u8 *dreg,
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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[];
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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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* @key_end: closing 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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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_end;
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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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} data;
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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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* @field_len: length of each field in concatenation, bytes
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* @field_count: number of concatenated fields in element
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* @expr: set must support for expressions
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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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u8 field_len[NFT_REG32_COUNT];
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u8 field_count;
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bool expr;
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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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u64 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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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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* @update: update an element if exists, add it if doesn't exist
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* @delete: delete an element
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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 elements
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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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*
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* Operations lookup, update and delete have simpler interfaces, are faster
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* and currently only used in the packet path. All the rest are slower,
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* control plane functions.
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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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bool (*delete)(const struct nft_set *set,
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const u32 *key);
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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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u64 (*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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void (*gc_init)(const struct nft_set *set);
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unsigned int elemsize;
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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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* @ops: set ops for this type
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* @features: features supported by the implementation
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*/
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struct nft_set_type {
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const struct nft_set_ops ops;
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u32 features;
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};
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#define to_set_type(o) container_of(o, struct nft_set_type, ops)
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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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* @table: table this set belongs to
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* @net: netnamespace this set belongs to
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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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* @field_len: length of each field in concatenation, bytes
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* @field_count: number of concatenated fields in element
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* @use: number of rules references to this set
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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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* @expr: stateful expression
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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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struct nft_table *table;
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possible_net_t net;
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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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u8 field_len[NFT_REG32_COUNT];
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u8 field_count;
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u32 use;
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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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struct nft_expr *expr;
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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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enum nft_trans_phase;
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void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
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struct nft_set_binding *binding,
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enum nft_trans_phase phase);
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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_destroy_set(const struct nft_ctx *ctx, struct nft_set *set);
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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_KEY_END: upper bound element key, for ranges
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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_KEY_END,
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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];
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};
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/**
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* struct nft_set_ext - set extensions
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*
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* @genmask: generation mask
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* @offset: offsets of individual extension types
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* @data: beginning of extension data
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*/
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struct nft_set_ext {
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u8 genmask;
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u8 offset[NFT_SET_EXT_NUM];
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char data[];
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};
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static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl)
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{
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memset(tmpl, 0, sizeof(*tmpl));
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tmpl->len = sizeof(struct nft_set_ext);
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}
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static inline void nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id,
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unsigned int len)
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{
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tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align);
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BUG_ON(tmpl->len > U8_MAX);
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tmpl->offset[id] = tmpl->len;
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tmpl->len += nft_set_ext_types[id].len + len;
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}
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static inline void nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id)
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{
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nft_set_ext_add_length(tmpl, id, 0);
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}
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static inline void nft_set_ext_init(struct nft_set_ext *ext,
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const struct nft_set_ext_tmpl *tmpl)
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{
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memcpy(ext->offset, tmpl->offset, sizeof(ext->offset));
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}
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static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
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{
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return !!ext->offset[id];
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}
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static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
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{
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return ext && __nft_set_ext_exists(ext, id);
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}
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static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id)
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{
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return (void *)ext + ext->offset[id];
|
}
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static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext)
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{
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return nft_set_ext(ext, NFT_SET_EXT_KEY);
|
}
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static inline struct nft_data *nft_set_ext_key_end(const struct nft_set_ext *ext)
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{
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return nft_set_ext(ext, NFT_SET_EXT_KEY_END);
|
}
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static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext)
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{
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return nft_set_ext(ext, NFT_SET_EXT_DATA);
|
}
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static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext)
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{
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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 u64 *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_jiffies64(*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);
|
}
|
|
struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
|
const struct nft_set *set,
|
const struct nlattr *attr);
|
|
void *nft_set_elem_init(const struct nft_set *set,
|
const struct nft_set_ext_tmpl *tmpl,
|
const u32 *key, const u32 *key_end, const u32 *data,
|
u64 timeout, u64 expiration, gfp_t gfp);
|
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_ops;
|
/**
|
* struct nft_expr_type - nf_tables expression type
|
*
|
* @select_ops: function to select nft_expr_ops
|
* @release_ops: release 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[]);
|
void (*release_ops)(const struct nft_expr_ops *ops);
|
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
|
#define NFT_EXPR_GC 0x2
|
|
enum nft_trans_phase {
|
NFT_TRANS_PREPARE,
|
NFT_TRANS_ABORT,
|
NFT_TRANS_COMMIT,
|
NFT_TRANS_RELEASE
|
};
|
|
struct nft_flow_rule;
|
struct nft_offload_ctx;
|
|
/**
|
* struct nft_expr_ops - nf_tables expression operations
|
*
|
* @eval: Expression evaluation function
|
* @size: full expression size, including private data size
|
* @init: initialization function
|
* @activate: activate expression in the next generation
|
* @deactivate: deactivate expression in next generation
|
* @destroy: destruction function, called after synchronize_rcu
|
* @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,
|
enum nft_trans_phase phase);
|
void (*destroy)(const struct nft_ctx *ctx,
|
const struct nft_expr *expr);
|
void (*destroy_clone)(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);
|
bool (*gc)(struct net *net,
|
const struct nft_expr *expr);
|
int (*offload)(struct nft_offload_ctx *ctx,
|
struct nft_flow_rule *flow,
|
const struct nft_expr *expr);
|
bool (*offload_action)(const struct nft_expr *expr);
|
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[]
|
__attribute__((aligned(__alignof__(u64))));
|
};
|
|
static inline void *nft_expr_priv(const struct nft_expr *expr)
|
{
|
return (void *)expr->data;
|
}
|
|
int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src);
|
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);
|
|
/**
|
* 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 bool nft_expr_more(const struct nft_rule *rule,
|
const struct nft_expr *expr)
|
{
|
return expr != nft_expr_last(rule) && expr->ops;
|
}
|
|
static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule)
|
{
|
return (void *)&rule->data[rule->dlen];
|
}
|
|
void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule);
|
|
static inline void nft_set_elem_update_expr(const struct nft_set_ext *ext,
|
struct nft_regs *regs,
|
const struct nft_pktinfo *pkt)
|
{
|
struct nft_expr *expr;
|
|
if (__nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) {
|
expr = nft_set_ext_expr(ext);
|
expr->ops->eval(expr, regs, pkt);
|
}
|
}
|
|
/*
|
* 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))
|
|
#define NFT_CHAIN_POLICY_UNSET U8_MAX
|
|
/**
|
* struct nft_chain - nf_tables chain
|
*
|
* @rules: list of rules in the chain
|
* @list: used internally
|
* @rhlhead: used internally
|
* @table: table that this chain belongs to
|
* @handle: chain handle
|
* @use: number of jump references to this chain
|
* @flags: bitmask of enum nft_chain_flags
|
* @name: name of the chain
|
*/
|
struct nft_chain {
|
struct nft_rule *__rcu *rules_gen_0;
|
struct nft_rule *__rcu *rules_gen_1;
|
struct list_head rules;
|
struct list_head list;
|
struct rhlist_head rhlhead;
|
struct nft_table *table;
|
u64 handle;
|
u32 use;
|
u8 flags:5,
|
bound:1,
|
genmask:2;
|
char *name;
|
u16 udlen;
|
u8 *udata;
|
|
/* Only used during control plane commit phase: */
|
struct nft_rule **rules_next;
|
};
|
|
int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain);
|
|
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
|
* @ops_register: base chain register function
|
* @ops_unregister: base chain unregister 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[NFT_MAX_HOOKS];
|
int (*ops_register)(struct net *net, const struct nf_hook_ops *ops);
|
void (*ops_unregister)(struct net *net, const struct nf_hook_ops *ops);
|
};
|
|
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);
|
|
static inline bool nft_chain_is_bound(struct nft_chain *chain)
|
{
|
return (chain->flags & NFT_CHAIN_BINDING) && chain->bound;
|
}
|
|
void nft_chain_del(struct nft_chain *chain);
|
void nf_tables_chain_destroy(struct nft_ctx *ctx);
|
|
struct nft_stats {
|
u64 bytes;
|
u64 pkts;
|
struct u64_stats_sync syncp;
|
};
|
|
struct nft_hook {
|
struct list_head list;
|
struct nf_hook_ops ops;
|
struct rcu_head rcu;
|
};
|
|
/**
|
* struct nft_base_chain - nf_tables base chain
|
*
|
* @ops: netfilter hook ops
|
* @hook_list: list of netfilter hooks (for NFPROTO_NETDEV family)
|
* @type: chain type
|
* @policy: default policy
|
* @stats: per-cpu chain stats
|
* @chain: the chain
|
* @flow_block: flow block (for hardware offload)
|
*/
|
struct nft_base_chain {
|
struct nf_hook_ops ops;
|
struct list_head hook_list;
|
const struct nft_chain_type *type;
|
u8 policy;
|
u8 flags;
|
struct nft_stats __percpu *stats;
|
struct nft_chain chain;
|
struct flow_block flow_block;
|
};
|
|
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_CHAIN_BASE;
|
}
|
|
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_ht: chains in the table
|
* @chains: same, for stable walks
|
* @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 rhltable chains_ht;
|
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;
|
u16 udlen;
|
u8 *udata;
|
};
|
|
static inline bool nft_base_chain_netdev(int family, u32 hooknum)
|
{
|
return family == NFPROTO_NETDEV ||
|
(family == NFPROTO_INET && hooknum == NF_INET_INGRESS);
|
}
|
|
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_hash_key - key to lookup nft_object
|
*
|
* @name: name of the stateful object to look up
|
* @table: table the object belongs to
|
*/
|
struct nft_object_hash_key {
|
const char *name;
|
const struct nft_table *table;
|
};
|
|
/**
|
* struct nft_object - nf_tables stateful object
|
*
|
* @list: table stateful object list node
|
* @key: keys that identify this object
|
* @rhlhead: nft_objname_ht node
|
* @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;
|
struct rhlist_head rhlhead;
|
struct nft_object_hash_key key;
|
u32 genmask:2,
|
use:30;
|
u64 handle;
|
u16 udlen;
|
u8 *udata;
|
/* 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 *nft_obj_lookup(const struct net *net,
|
const struct nft_table *table,
|
const struct nlattr *nla, u32 objtype,
|
u8 genmask);
|
|
void nft_obj_notify(struct net *net, const 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
|
* @update: update 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)(const struct nft_ctx *ctx,
|
struct nft_object *obj);
|
int (*dump)(struct sk_buff *skb,
|
struct nft_object *obj,
|
bool reset);
|
void (*update)(struct nft_object *obj,
|
struct nft_object *newobj);
|
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_NETDEVICE_MAX 256
|
|
/**
|
* 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
|
* @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 ops_len;
|
u32 genmask:2,
|
use:30;
|
u64 handle;
|
/* runtime data below here */
|
struct list_head hook_list ____cacheline_aligned;
|
struct nf_flowtable data;
|
};
|
|
struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
|
const struct nlattr *nla,
|
u8 genmask);
|
|
void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
|
struct nft_flowtable *flowtable,
|
enum nft_trans_phase phase);
|
|
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_OBJ(type) \
|
MODULE_ALIAS("nft-obj-" __stringify(type))
|
|
#if IS_ENABLED(CONFIG_NF_TABLES)
|
|
/*
|
* 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);
|
}
|
|
#endif /* IS_ENABLED(CONFIG_NF_TABLES) */
|
|
/*
|
* 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
|
* @put_net: ctx->net needs to be put
|
* @ctx: transaction context
|
* @data: internal information related to the transaction
|
*/
|
struct nft_trans {
|
struct list_head list;
|
int msg_type;
|
bool put_net;
|
struct nft_ctx ctx;
|
char data[];
|
};
|
|
struct nft_trans_rule {
|
struct nft_rule *rule;
|
struct nft_flow_rule *flow;
|
u32 rule_id;
|
};
|
|
#define nft_trans_rule(trans) \
|
(((struct nft_trans_rule *)trans->data)->rule)
|
#define nft_trans_flow_rule(trans) \
|
(((struct nft_trans_rule *)trans->data)->flow)
|
#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;
|
bool bound;
|
};
|
|
#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)
|
#define nft_trans_set_bound(trans) \
|
(((struct nft_trans_set *)trans->data)->bound)
|
|
struct nft_trans_chain {
|
bool update;
|
char *name;
|
struct nft_stats __percpu *stats;
|
u8 policy;
|
u32 chain_id;
|
};
|
|
#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)
|
#define nft_trans_chain_id(trans) \
|
(((struct nft_trans_chain *)trans->data)->chain_id)
|
|
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;
|
bool bound;
|
};
|
|
#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)
|
#define nft_trans_elem_set_bound(trans) \
|
(((struct nft_trans_elem *)trans->data)->bound)
|
|
struct nft_trans_obj {
|
struct nft_object *obj;
|
struct nft_object *newobj;
|
bool update;
|
};
|
|
#define nft_trans_obj(trans) \
|
(((struct nft_trans_obj *)trans->data)->obj)
|
#define nft_trans_obj_newobj(trans) \
|
(((struct nft_trans_obj *)trans->data)->newobj)
|
#define nft_trans_obj_update(trans) \
|
(((struct nft_trans_obj *)trans->data)->update)
|
|
struct nft_trans_flowtable {
|
struct nft_flowtable *flowtable;
|
bool update;
|
struct list_head hook_list;
|
u32 flags;
|
};
|
|
#define nft_trans_flowtable(trans) \
|
(((struct nft_trans_flowtable *)trans->data)->flowtable)
|
#define nft_trans_flowtable_update(trans) \
|
(((struct nft_trans_flowtable *)trans->data)->update)
|
#define nft_trans_flowtable_hooks(trans) \
|
(((struct nft_trans_flowtable *)trans->data)->hook_list)
|
#define nft_trans_flowtable_flags(trans) \
|
(((struct nft_trans_flowtable *)trans->data)->flags)
|
|
int __init nft_chain_filter_init(void);
|
void nft_chain_filter_fini(void);
|
|
void __init nft_chain_route_init(void);
|
void nft_chain_route_fini(void);
|
|
void nf_tables_trans_destroy_flush_work(void);
|
|
int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result);
|
__be64 nf_jiffies64_to_msecs(u64 input);
|
|
#endif /* _NET_NF_TABLES_H */
|
