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
9 struct 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
26 typedef int (*nl_ext_ack_fn_t)(const char *errmsg, uint32_t off,
27 const struct nlmsghdr *inner_nlh);
28
29 int rtnl_open(struct rtnl_handle *rth, unsigned int subscriptions)
30 __attribute__((warn_unused_result));
31 void rtnl_close(struct rtnl_handle *rth);
32 int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
33 struct nlmsghdr **answer)
34 __attribute__((warn_unused_result));
35
36 int addattr(struct nlmsghdr *n, int maxlen, int type);
37 int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data);
38 int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data);
39 int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data);
40 int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data);
41 int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *data);
42 int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data, int alen);
43 int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len);
44 struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type);
45 int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest);
46 #endif /* NETLINK_HELPERS_H */
47
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