![Pablo Neira Ayuso](/assets/img/avatar_default.png)
This new helper function allows us to check if this is a basechain. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
1302 lines
34 KiB
C
1302 lines
34 KiB
C
#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/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_proto_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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static inline void nft_set_pktinfo_unspec(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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nft_set_pktinfo(pkt, skb, state);
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nft_set_pktinfo_proto_unspec(pkt, skb);
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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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* @afi: address family info
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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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* @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_af_info *afi;
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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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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_uninit(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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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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* @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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* @list: nf_tables_set_ops list node
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* @owner: module reference
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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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unsigned int (*privsize)(const struct nlattr * const nla[]);
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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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struct list_head list;
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struct module *owner;
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unsigned int elemsize;
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u32 features;
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};
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int nft_register_set(struct nft_set_ops *ops);
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void nft_unregister_set(struct nft_set_ops *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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* @name: name 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[NFT_SET_MAXNAMELEN];
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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 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(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];
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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[0];
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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);
|
|
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 (*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[NFT_CHAIN_MAXNAMELEN];
|
|
};
|
|
|
|
enum nft_chain_type {
|
|
NFT_CHAIN_T_DEFAULT = 0,
|
|
NFT_CHAIN_T_ROUTE,
|
|
NFT_CHAIN_T_NAT,
|
|
NFT_CHAIN_T_MAX
|
|
};
|
|
|
|
/**
|
|
* struct nf_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: hookfn overrides
|
|
*/
|
|
struct nf_chain_type {
|
|
const char *name;
|
|
enum nft_chain_type type;
|
|
int family;
|
|
struct module *owner;
|
|
unsigned int hook_mask;
|
|
nf_hookfn *hooks[NF_MAX_HOOKS];
|
|
};
|
|
|
|
int nft_chain_validate_dependency(const struct nft_chain *chain,
|
|
enum nft_chain_type 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;
|
|
};
|
|
|
|
#define NFT_HOOK_OPS_MAX 2
|
|
|
|
/**
|
|
* 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[NFT_HOOK_OPS_MAX];
|
|
const struct nf_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
|
|
* @hgenerator: handle generator state
|
|
* @use: number of chain references to this table
|
|
* @flags: table flag (see enum nft_table_flags)
|
|
* @genmask: generation mask
|
|
* @name: name of the table
|
|
*/
|
|
struct nft_table {
|
|
struct list_head list;
|
|
struct list_head chains;
|
|
struct list_head sets;
|
|
struct list_head objects;
|
|
u64 hgenerator;
|
|
u32 use;
|
|
u16 flags:14,
|
|
genmask:2;
|
|
char name[NFT_TABLE_MAXNAMELEN];
|
|
};
|
|
|
|
enum nft_af_flags {
|
|
NFT_AF_NEEDS_DEV = (1 << 0),
|
|
};
|
|
|
|
/**
|
|
* struct nft_af_info - nf_tables address family info
|
|
*
|
|
* @list: used internally
|
|
* @family: address family
|
|
* @nhooks: number of hooks in this family
|
|
* @owner: module owner
|
|
* @tables: used internally
|
|
* @flags: family flags
|
|
* @nops: number of hook ops in this family
|
|
* @hook_ops_init: initialization function for chain hook ops
|
|
* @hooks: hookfn overrides for packet validation
|
|
*/
|
|
struct nft_af_info {
|
|
struct list_head list;
|
|
int family;
|
|
unsigned int nhooks;
|
|
struct module *owner;
|
|
struct list_head tables;
|
|
u32 flags;
|
|
unsigned int nops;
|
|
void (*hook_ops_init)(struct nf_hook_ops *,
|
|
unsigned int);
|
|
nf_hookfn *hooks[NF_MAX_HOOKS];
|
|
};
|
|
|
|
int nft_register_afinfo(struct net *, struct nft_af_info *);
|
|
void nft_unregister_afinfo(struct net *, struct nft_af_info *);
|
|
|
|
int nft_register_chain_type(const struct nf_chain_type *);
|
|
void nft_unregister_chain_type(const struct nf_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
|
|
* @type: pointer to object type
|
|
* @data: pointer to object data
|
|
* @name: name of this stateful object
|
|
* @genmask: generation mask
|
|
* @use: number of references to this stateful object
|
|
* @data: object data, layout depends on type
|
|
*/
|
|
struct nft_object {
|
|
struct list_head list;
|
|
char name[NFT_OBJ_MAXNAMELEN];
|
|
struct nft_table *table;
|
|
u32 genmask:2,
|
|
use:30;
|
|
/* runtime data below here */
|
|
const struct nft_object_type *type ____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
|
|
*
|
|
* @eval: stateful object evaluation function
|
|
* @list: list node in list of object types
|
|
* @type: stateful object numeric type
|
|
* @size: stateful object size
|
|
* @owner: module owner
|
|
* @maxattr: maximum netlink attribute
|
|
* @policy: netlink attribute policy
|
|
* @init: initialize object from netlink attributes
|
|
* @destroy: release existing stateful object
|
|
* @dump: netlink dump stateful object
|
|
*/
|
|
struct nft_object_type {
|
|
void (*eval)(struct nft_object *obj,
|
|
struct nft_regs *regs,
|
|
const struct nft_pktinfo *pkt);
|
|
struct list_head list;
|
|
u32 type;
|
|
unsigned int size;
|
|
unsigned int maxattr;
|
|
struct module *owner;
|
|
const struct nla_policy *policy;
|
|
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);
|
|
};
|
|
|
|
int nft_register_obj(struct nft_object_type *obj_type);
|
|
void nft_unregister_obj(struct nft_object_type *obj_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 nft_dereference(p) \
|
|
nfnl_dereference(p, NFNL_SUBSYS_NFTABLES)
|
|
|
|
#define MODULE_ALIAS_NFT_FAMILY(family) \
|
|
MODULE_ALIAS("nft-afinfo-" __stringify(family))
|
|
|
|
#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 ACCESS_ONCE() to prevent refetching the value for atomicity */
|
|
return 1 << ACCESS_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[NFT_CHAIN_MAXNAMELEN];
|
|
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)
|
|
|
|
#endif /* _NET_NF_TABLES_H */
|