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#ifndef NFTABLES_NETLINK_H
#define NFTABLES_NETLINK_H
#include <libnftnl/table.h>
#include <libnftnl/chain.h>
#include <libnftnl/rule.h>
#include <libnftnl/expr.h>
#include <libnftnl/set.h>
#include <libnftnl/object.h>
#include <libnftnl/flowtable.h>
#include <linux/netlink.h>
#include <linux/netfilter/nf_tables.h>
#include <rule.h>
#define MAX_REGS (1 + NFT_REG32_15 - NFT_REG32_00)
#ifndef NETLINK_EXT_ACK
#define NETLINK_EXT_ACK 11
enum nlmsgerr_attrs {
NLMSGERR_ATTR_UNUSED,
NLMSGERR_ATTR_MSG,
NLMSGERR_ATTR_OFFS,
NLMSGERR_ATTR_COOKIE,
__NLMSGERR_ATTR_MAX,
NLMSGERR_ATTR_MAX = __NLMSGERR_ATTR_MAX - 1
};
#define NLM_F_CAPPED 0x100 /* request was capped */
#define NLM_F_ACK_TLVS 0x200 /* extended ACK TVLs were included */
#endif
struct netlink_parse_ctx {
struct list_head *msgs;
struct table *table;
struct rule *rule;
struct stmt *stmt;
struct expr *registers[MAX_REGS + 1];
unsigned int debug_mask;
};
struct rule_pp_ctx {
struct proto_ctx pctx;
struct payload_dep_ctx pdctx;
struct stmt *stmt;
};
extern const struct input_descriptor indesc_netlink;
extern const struct location netlink_location;
/**
* struct netlink_ctx
*
* @nft: nftables context
* @msgs: message queue
* @list: list of parsed rules/chains/tables
* @set: current set
* @data: pointer to pass data to callback
* @seqnum: sequence number
*/
struct netlink_ctx {
struct nft_ctx *nft;
struct list_head *msgs;
struct list_head list;
struct set *set;
const void *data;
uint32_t seqnum;
struct nftnl_batch *batch;
};
extern struct nftnl_expr *alloc_nft_expr(const char *name);
extern void alloc_setelem_cache(const struct expr *set, struct nftnl_set *nls);
struct nftnl_set_elem *alloc_nftnl_setelem(const struct expr *set,
const struct expr *expr);
extern struct nftnl_table *netlink_table_alloc(const struct nlmsghdr *nlh);
extern struct nftnl_chain *netlink_chain_alloc(const struct nlmsghdr *nlh);
extern struct nftnl_set *netlink_set_alloc(const struct nlmsghdr *nlh);
extern struct nftnl_obj *netlink_obj_alloc(const struct nlmsghdr *nlh);
extern struct nftnl_rule *netlink_rule_alloc(const struct nlmsghdr *nlh);
struct nft_data_linearize {
uint32_t len;
uint32_t value[4];
char chain[NFT_CHAIN_MAXNAMELEN];
uint32_t chain_id;
int verdict;
};
struct nft_data_delinearize {
uint32_t len;
const uint32_t *value;
const char *chain;
int verdict;
};
static inline unsigned int netlink_register_space(unsigned int size)
{
return div_round_up(size, NFT_REG32_SIZE * BITS_PER_BYTE);
}
static inline unsigned int netlink_padded_len(unsigned int size)
{
return netlink_register_space(size) * NFT_REG32_SIZE * BITS_PER_BYTE;
}
static inline unsigned int netlink_padding_len(unsigned int size)
{
return netlink_padded_len(size) - size;
}
extern void netlink_gen_data(const struct expr *expr,
struct nft_data_linearize *data);
extern void netlink_gen_raw_data(const mpz_t value, enum byteorder byteorder,
unsigned int len,
struct nft_data_linearize *data);
extern struct nftnl_expr *netlink_gen_stmt_stateful(const struct stmt *stmt);
extern struct expr *netlink_alloc_value(const struct location *loc,
const struct nft_data_delinearize *nld);
extern struct expr *netlink_alloc_data(const struct location *loc,
const struct nft_data_delinearize *nld,
enum nft_registers dreg);
struct netlink_linearize_ctx;
extern void netlink_linearize_rule(struct netlink_ctx *ctx,
const struct rule *rule,
struct netlink_linearize_ctx *lctx);
extern struct rule *netlink_delinearize_rule(struct netlink_ctx *ctx,
struct nftnl_rule *r);
extern int netlink_list_chains(struct netlink_ctx *ctx, const struct handle *h);
extern struct chain *netlink_delinearize_chain(struct netlink_ctx *ctx,
const struct nftnl_chain *nlc);
extern int netlink_list_tables(struct netlink_ctx *ctx, const struct handle *h,
const struct nft_cache_filter *filter);
extern struct table *netlink_delinearize_table(struct netlink_ctx *ctx,
const struct nftnl_table *nlt);
extern struct set *netlink_delinearize_set(struct netlink_ctx *ctx,
const struct nftnl_set *nls);
extern struct stmt *netlink_parse_set_expr(const struct set *set,
const struct nft_cache *cache,
const struct nftnl_expr *nle);
extern int netlink_list_setelems(struct netlink_ctx *ctx,
const struct handle *h, struct set *set);
extern int netlink_get_setelem(struct netlink_ctx *ctx, const struct handle *h,
const struct location *loc, struct set *cache_set,
struct set *set, struct expr *init);
extern int netlink_delinearize_setelem(struct nftnl_set_elem *nlse,
struct set *set,
struct nft_cache *cache);
extern int netlink_list_objs(struct netlink_ctx *ctx, const struct handle *h);
extern int netlink_reset_objs(struct netlink_ctx *ctx, const struct cmd *cmd,
uint32_t type, bool dump);
extern struct obj *netlink_delinearize_obj(struct netlink_ctx *ctx,
struct nftnl_obj *nlo);
extern int netlink_list_flowtables(struct netlink_ctx *ctx,
const struct handle *h);
extern struct flowtable *netlink_delinearize_flowtable(struct netlink_ctx *ctx,
struct nftnl_flowtable *nlo);
extern void netlink_dump_chain(const struct nftnl_chain *nlc,
struct netlink_ctx *ctx);
extern void netlink_dump_rule(const struct nftnl_rule *nlr,
struct netlink_ctx *ctx);
extern void netlink_dump_expr(const struct nftnl_expr *nle,
FILE *fp, unsigned int debug_mask);
extern void netlink_dump_set(const struct nftnl_set *nls,
struct netlink_ctx *ctx);
extern void netlink_dump_obj(struct nftnl_obj *nlo, struct netlink_ctx *ctx);
extern void netlink_dump_flowtable(struct nftnl_flowtable *flo, struct netlink_ctx *ctx);
#define netlink_abi_error() \
__netlink_abi_error(__FILE__, __LINE__, strerror(errno));
extern void __noreturn __netlink_abi_error(const char *file, int line, const char *reason);
extern int netlink_io_error(struct netlink_ctx *ctx,
const struct location *loc, const char *fmt, ...) __attribute__((format(printf, 3, 4)));
#define netlink_init_error() \
__netlink_init_error(__FILE__, __LINE__, strerror(errno));
extern void __noreturn __netlink_init_error(const char *file, int line, const char *reason);
struct netlink_mon_handler {
uint32_t monitor_flags;
uint32_t format;
struct netlink_ctx *ctx;
const struct location *loc;
unsigned int debug_mask;
struct nft_cache *cache;
};
extern int netlink_monitor(struct netlink_mon_handler *monhandler,
struct mnl_socket *nf_sock);
struct netlink_cb_data {
struct netlink_ctx *nl_ctx;
struct list_head *err_list;
};
int netlink_echo_callback(const struct nlmsghdr *nlh, void *data);
struct ruleset_parse {
struct netlink_ctx *nl_ctx;
struct cmd *cmd;
};
struct nftnl_parse_ctx;
int netlink_events_trace_cb(const struct nlmsghdr *nlh, int type,
struct netlink_mon_handler *monh);
enum nft_data_types dtype_map_to_kernel(const struct datatype *dtype);
void netlink_linearize_init(struct netlink_linearize_ctx *lctx,
struct nftnl_rule *nlr);
void netlink_linearize_fini(struct netlink_linearize_ctx *lctx);
struct netlink_linearize_ctx {
struct nftnl_rule *nlr;
unsigned int reg_low;
struct list_head *expr_loc_htable;
};
#define NFT_EXPR_LOC_HSIZE 128
struct nft_expr_loc {
struct list_head hlist;
const struct nftnl_expr *nle;
const struct location *loc;
};
struct nft_expr_loc *nft_expr_loc_find(const struct nftnl_expr *nle,
struct netlink_linearize_ctx *ctx);
#endif /* NFTABLES_NETLINK_H */
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