1/* SPDX-License-Identifier: GPL-2.0-or-later */
2#ifndef NETLINK_HELPERS_H
3#define NETLINK_HELPERS_H
4
5#include <string.h>
6#include <linux/netlink.h>
7#include <linux/rtnetlink.h>
8
9struct rtnl_handle {
10	int			fd;
11	struct sockaddr_nl	local;
12	struct sockaddr_nl	peer;
13	__u32			seq;
14	__u32			dump;
15	int			proto;
16	FILE			*dump_fp;
17#define RTNL_HANDLE_F_LISTEN_ALL_NSID		0x01
18#define RTNL_HANDLE_F_SUPPRESS_NLERR		0x02
19#define RTNL_HANDLE_F_STRICT_CHK		0x04
20	int			flags;
21};
22
23#define NLMSG_TAIL(nmsg) \
24	((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
25
26typedef int (*nl_ext_ack_fn_t)(const char *errmsg, uint32_t off,
27			       const struct nlmsghdr *inner_nlh);
28
29int rtnl_open(struct rtnl_handle *rth, unsigned int subscriptions)
30	      __attribute__((warn_unused_result));
31void rtnl_close(struct rtnl_handle *rth);
32int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
33	      struct nlmsghdr **answer)
34	      __attribute__((warn_unused_result));
35
36int addattr(struct nlmsghdr *n, int maxlen, int type);
37int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data);
38int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data);
39int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data);
40int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data);
41int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *data);
42int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data, int alen);
43int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len);
44struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type);
45int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest);
46#endif /* NETLINK_HELPERS_H */
47