src: support for stateful objects

This patch allows you to add, to delete and to get stateful objects,
this support two object types: counter and quota.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 55 insertions, 0 deletions

diff --git a/include/obj.h b/include/obj.h
new file mode 100644
index 0000000..edbf023
--- /dev/null
+++ b/include/obj.h
@@ -0,0 +1,55 @@
+#ifndef _OBJ_OPS_H_
+#define _OBJ_OPS_H_
+
+#include <stdint.h>
+#include "internal.h"
+
+struct nlattr;
+struct nlmsghdr;
+struct nftnl_obj;
+
+struct nftnl_obj {
+	struct list_head	head;
+	struct obj_ops		*ops;
+
+	const char		*table;
+	const char		*name;
+
+	uint32_t		family;
+	uint32_t		use;
+
+	uint32_t		flags;
+
+	union {
+		struct nftnl_obj_counter {
+			uint64_t	pkts;
+			uint64_t	bytes;
+		} counter;
+		struct nftnl_obj_quota {
+			uint64_t        bytes;
+			uint64_t	consumed;
+			uint32_t        flags;
+		} quota;
+	} data;
+};
+
+struct obj_ops {
+	const char *name;
+	uint32_t type;
+	size_t	alloc_len;
+	int	max_attr;
+	int	(*set)(struct nftnl_obj *e, uint16_t type, const void *data, uint32_t data_len);
+	const void *(*get)(const struct nftnl_obj *e, uint16_t type, uint32_t *data_len);
+	int	(*parse)(struct nftnl_obj *e, struct nlattr *attr);
+	void	(*build)(struct nlmsghdr *nlh, const struct nftnl_obj *e);
+	int	(*snprintf)(char *buf, size_t len, uint32_t type, uint32_t flags, const struct nftnl_obj *e);
+	int	(*json_parse)(struct nftnl_obj *e, json_t *data,
+			      struct nftnl_parse_err *err);
+};
+
+extern struct obj_ops obj_ops_counter;
+extern struct obj_ops obj_ops_quota;
+
+#define nftnl_obj_data(obj) (void *)&obj->data
+
+#endif