1 files changed, 74 insertions, 0 deletions
diff --git a/include/payload.h b/include/payload.h
new file mode 100644
index 0000000..08e45f7
--- /dev/null
+++ b/include/payload.h
@@ -0,0 +1,74 @@
+#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);
+int payload_gen_inner_dependency(struct eval_ctx *ctx, const struct expr *expr,
+				 struct stmt **res);
+extern int payload_gen_icmp_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
+ *
+ * @icmp_type: extra info for icmp(6) decoding
+ * @prev: previous statement
+ * @pdeps: last dependency match per protocol layer
+ */
+struct payload_dep_ctx {
+	uint8_t		icmp_type;
+	struct stmt	*prev;
+	struct stmt	*pdeps[PROTO_BASE_MAX + 1];
+};
+
+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 struct expr *payload_dependency_get(struct payload_dep_ctx *ctx,
+					   enum proto_bases base);
+extern void payload_dependency_release(struct payload_dep_ctx *ctx,
+				       enum proto_bases base);
+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);
+
+const struct proto_desc *find_proto_desc(const struct nftnl_udata *ud);
+
+#endif /* NFTABLES_PAYLOAD_H */