#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);

void payload_dependency_reset(struct payload_dep_ctx *ctx);

extern void payload_dependency_store(struct payload_dep_ctx *ctx,

				     struct stmt *stmt,

				     enum proto_bases base);

extern bool payload_dependency_exists(const struct payload_dep_ctx *ctx,

				      enum proto_bases base);

extern void payload_dependency_release(struct payload_dep_ctx *ctx);

extern void payload_dependency_kill(struct payload_dep_ctx *ctx,

				    struct expr *expr, unsigned int family);

extern void exthdr_dependency_kill(struct payload_dep_ctx *ctx,

				   struct expr *expr, unsigned int family);

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);

bool payload_expr_cmp(const struct expr *e1, const struct expr *e2);

#endif /* NFTABLES_PAYLOAD_H */