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#ifndef NFTABLES_PAYLOAD_H
#define NFTABLES_PAYLOAD_H
#include <nftables.h>
#include <proto.h>
extern struct expr *payload_expr_alloc(const struct location *loc,
const struct proto_desc *desc,
unsigned int type);
extern void payload_init_raw(struct expr *expr, enum proto_bases base,
unsigned int offset, unsigned int len);
extern unsigned int payload_hdr_field(const struct expr *expr);
struct eval_ctx;
struct stmt;
extern int payload_gen_dependency(struct eval_ctx *ctx, const struct expr *expr,
struct stmt **res);
extern int exthdr_gen_dependency(struct eval_ctx *ctx, const struct expr *expr,
const struct proto_desc *dependency,
enum proto_bases pb, struct stmt **res);
/**
* struct payload_dep_ctx - payload protocol dependency tracking
*
* @pbase: protocol base of last dependency match
* @pdep: last dependency match
* @prev: previous statement
*/
struct payload_dep_ctx {
enum proto_bases pbase;
struct stmt *pdep;
struct stmt *prev;
};
extern bool payload_is_known(const struct expr *expr);
extern bool payload_is_stacked(const struct proto_desc *desc,
const struct expr *expr);
extern void payload_dependency_store(struct payload_dep_ctx *ctx,
struct stmt *stmt,
enum proto_bases base);
extern void __payload_dependency_kill(struct payload_dep_ctx *ctx,
enum proto_bases base);
extern void payload_dependency_kill(struct payload_dep_ctx *ctx,
struct expr *expr);
extern void exthdr_dependency_kill(struct payload_dep_ctx *ctx,
struct expr *expr);
extern bool payload_can_merge(const struct expr *e1, const struct expr *e2);
extern struct expr *payload_expr_join(const struct expr *e1,
const struct expr *e2);
bool payload_expr_trim(struct expr *expr, struct expr *mask,
const struct proto_ctx *ctx, unsigned int *shift);
extern void payload_expr_expand(struct list_head *list, struct expr *expr,
const struct proto_ctx *ctx);
extern void payload_expr_complete(struct expr *expr,
const struct proto_ctx *ctx);
#endif /* NFTABLES_PAYLOAD_H */
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