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#ifndef _NET_NF_TABLES_H
#define _NET_NF_TABLES_H
#include <linux/list.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/nf_tables.h>
#include <linux/u64_stats_sync.h>
#include <net/netlink.h>
#define NFT_JUMP_STACK_SIZE 16
struct nft_pktinfo {
struct sk_buff *skb;
const struct net_device *in;
const struct net_device *out;
const struct nf_hook_ops *ops;
u8 nhoff;
u8 thoff;
u8 tprot;
/* for x_tables compatibility */
struct xt_action_param xt;
};
static inline void nft_set_pktinfo(struct nft_pktinfo *pkt,
const struct nf_hook_ops *ops,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out)
{
pkt->skb = skb;
pkt->in = pkt->xt.in = in;
pkt->out = pkt->xt.out = out;
pkt->ops = ops;
pkt->xt.hooknum = ops->hooknum;
pkt->xt.family = ops->pf;
}
struct nft_data {
union {
u32 data[4];
struct {
u32 verdict;
struct nft_chain *chain;
};
};
} __attribute__((aligned(__alignof__(u64))));
static inline int nft_data_cmp(const struct nft_data *d1,
const struct nft_data *d2,
unsigned int len)
{
return memcmp(d1->data, d2->data, len);
}
static inline void nft_data_copy(struct nft_data *dst,
const struct nft_data *src)
{
BUILD_BUG_ON(__alignof__(*dst) != __alignof__(u64));
*(u64 *)&dst->data[0] = *(u64 *)&src->data[0];
*(u64 *)&dst->data[2] = *(u64 *)&src->data[2];
}
static inline void nft_data_debug(const struct nft_data *data)
{
pr_debug("data[0]=%x data[1]=%x data[2]=%x data[3]=%x\n",
data->data[0], data->data[1],
data->data[2], data->data[3]);
}
/**
* struct nft_ctx - nf_tables rule/set context
*
* @net: net namespace
* @afi: address family info
* @table: the table the chain is contained in
* @chain: the chain the rule is contained in
* @nla: netlink attributes
* @portid: netlink portID of the original message
* @seq: netlink sequence number
* @report: notify via unicast netlink message
*/
struct nft_ctx {
struct net *net;
struct nft_af_info *afi;
struct nft_table *table;
struct nft_chain *chain;
const struct nlattr * const *nla;
u32 portid;
u32 seq;
bool report;
};
struct nft_data_desc {
enum nft_data_types type;
unsigned int len;
};
int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
struct nft_data_desc *desc, const struct nlattr *nla);
void nft_data_uninit(const struct nft_data *data, enum nft_data_types type);
int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
enum nft_data_types type, unsigned int len);
static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg)
{
return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE;
}
static inline enum nft_registers nft_type_to_reg(enum nft_data_types type)
{
return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1;
}
int nft_validate_input_register(enum nft_registers reg);
int nft_validate_output_register(enum nft_registers reg);
int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg,
const struct nft_data *data,
enum nft_data_types type);
/**
* struct nft_set_elem - generic representation of set elements
*
* @cookie: implementation specific element cookie
* @key: element key
* @data: element data (maps only)
* @flags: element flags (end of interval)
*
* The cookie can be used to store a handle to the element for subsequent
* removal.
*/
struct nft_set_elem {
void *cookie;
struct nft_data key;
struct nft_data data;
u32 flags;
};
struct nft_set;
struct nft_set_iter {
unsigned int count;
unsigned int skip;
int err;
int (*fn)(const struct nft_ctx *ctx,
const struct nft_set *set,
const struct nft_set_iter *iter,
const struct nft_set_elem *elem);
};
/**
* struct nft_set_desc - description of set elements
*
* @klen: key length
* @dlen: data length
* @size: number of set elements
*/
struct nft_set_desc {
unsigned int klen;
unsigned int dlen;
unsigned int size;
};
/**
* enum nft_set_class - performance class
*
* @NFT_LOOKUP_O_1: constant, O(1)
* @NFT_LOOKUP_O_LOG_N: logarithmic, O(log N)
* @NFT_LOOKUP_O_N: linear, O(N)
*/
enum nft_set_class {
NFT_SET_CLASS_O_1,
NFT_SET_CLASS_O_LOG_N,
NFT_SET_CLASS_O_N,
};
/**
* struct nft_set_estimate - estimation of memory and performance
* characteristics
*
* @size: required memory
* @class: lookup performance class
*/
struct nft_set_estimate {
unsigned int size;
enum nft_set_class class;
};
/**
* struct nft_set_ops - nf_tables set operations
*
* @lookup: look up an element within the set
* @insert: insert new element into set
* @remove: remove element from set
* @walk: iterate over all set elemeennts
* @privsize: function to return size of set private data
* @init: initialize private data of new set instance
* @destroy: destroy private data of set instance
* @list: nf_tables_set_ops list node
* @owner: module reference
* @features: features supported by the implementation
*/
struct nft_set_ops {
bool (*lookup)(const struct nft_set *set,
const struct nft_data *key,
struct nft_data *data);
int (*get)(const struct nft_set *set,
struct nft_set_elem *elem);
int (*insert)(const struct nft_set *set,
const struct nft_set_elem *elem);
void (*remove)(const struct nft_set *set,
const struct nft_set_elem *elem);
void (*walk)(const struct nft_ctx *ctx,
const struct nft_set *set,
struct nft_set_iter *iter);
unsigned int (*privsize)(const struct nlattr * const nla[]);
bool (*estimate)(const struct nft_set_desc *desc,
u32 features,
struct nft_set_estimate *est);
int (*init)(const
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