libnetlink.h revision cfd2cbd15f03e26fdb8617a9f37a0a25425adfe2 
1#ifndef __LIBNETLINK_H__
2#define __LIBNETLINK_H__ 1
3
4#include <string.h>
5#include <asm/types.h>
6#include <linux/netlink.h>
7#include <linux/rtnetlink.h>
8#include <linux/if_link.h>
9#include <linux/if_addr.h>
10#include <linux/neighbour.h>
11
12struct rtnl_handle
13{
14	int			fd;
15	struct sockaddr_nl	local;
16	struct sockaddr_nl	peer;
17	__u32			seq;
18	__u32			dump;
19};
20
21extern int rcvbuf;
22
23extern int rtnl_open(struct rtnl_handle *rth, unsigned subscriptions);
24extern int rtnl_open_byproto(struct rtnl_handle *rth, unsigned subscriptions, int protocol);
25extern void rtnl_close(struct rtnl_handle *rth);
26extern int rtnl_wilddump_request(struct rtnl_handle *rth, int fam, int type);
27extern int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req, int len);
28
29typedef int (*rtnl_filter_t)(const struct sockaddr_nl *,
30			     struct nlmsghdr *n, void *);
31
32struct rtnl_dump_filter_arg
33{
34	rtnl_filter_t filter;
35	void *arg1;
36};
37
38extern int rtnl_dump_filter_l(struct rtnl_handle *rth,
39			      const struct rtnl_dump_filter_arg *arg);
40extern int rtnl_dump_filter(struct rtnl_handle *rth, rtnl_filter_t filter,
41			    void *arg);
42extern int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, pid_t peer,
43		     unsigned groups, struct nlmsghdr *answer);
44extern int rtnl_send(struct rtnl_handle *rth, const void *buf, int);
45extern int rtnl_send_check(struct rtnl_handle *rth, const void *buf, int);
46
47extern int addattr(struct nlmsghdr *n, int maxlen, int type);
48extern int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data);
49extern int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data);
50extern int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data);
51extern int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data);
52extern int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *data);
53
54extern int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data, int alen);
55extern int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len);
56extern struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type);
57extern int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest);
58extern struct rtattr *addattr_nest_compat(struct nlmsghdr *n, int maxlen, int type, const void *data, int len);
59extern int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *nest);
60extern int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data);
61extern int rta_addattr_l(struct rtattr *rta, int maxlen, int type, const void *data, int alen);
62
63extern int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len);
64extern int parse_rtattr_byindex(struct rtattr *tb[], int max, struct rtattr *rta, int len);
65extern int __parse_rtattr_nested_compat(struct rtattr *tb[], int max, struct rtattr *rta, int len);
66
67#define parse_rtattr_nested(tb, max, rta) \
68	(parse_rtattr((tb), (max), RTA_DATA(rta), RTA_PAYLOAD(rta)))
69
70#define parse_rtattr_nested_compat(tb, max, rta, data, len) \
71	({ data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL;	\
72		__parse_rtattr_nested_compat(tb, max, rta, len); })
73
74static inline __u16 rta_getattr_u16(const struct rtattr *rta)
75{
76	return *(__u16 *)RTA_DATA(rta);
77}
78static inline __u16 rta_getattr_u32(const struct rtattr *rta)
79{
80	return *(__u32 *)RTA_DATA(rta);
81}
82static inline __u64 rta_getattr_u64(const struct rtattr *rta)
83{
84	__u64 tmp;
85	memcpy(&tmp, RTA_DATA(rta), sizeof(__u64));
86	return tmp;
87}
88static inline const char *rta_getattr_str(const struct rtattr *rta)
89{
90	return (const char *)RTA_DATA(rta);
91}
92
93extern int rtnl_listen(struct rtnl_handle *, rtnl_filter_t handler,
94		       void *jarg);
95extern int rtnl_from_file(FILE *, rtnl_filter_t handler,
96		       void *jarg);
97
98#define NLMSG_TAIL(nmsg) \
99	((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
100
101#ifndef IFA_RTA
102#define IFA_RTA(r) \
103	((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
104#endif
105#ifndef IFA_PAYLOAD
106#define IFA_PAYLOAD(n)	NLMSG_PAYLOAD(n,sizeof(struct ifaddrmsg))
107#endif
108
109#ifndef IFLA_RTA
110#define IFLA_RTA(r) \
111	((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifinfomsg))))
112#endif
113#ifndef IFLA_PAYLOAD
114#define IFLA_PAYLOAD(n)	NLMSG_PAYLOAD(n,sizeof(struct ifinfomsg))
115#endif
116
117#ifndef NDA_RTA
118#define NDA_RTA(r) \
119	((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
120#endif
121#ifndef NDA_PAYLOAD
122#define NDA_PAYLOAD(n)	NLMSG_PAYLOAD(n,sizeof(struct ndmsg))
123#endif
124
125#ifndef NDTA_RTA
126#define NDTA_RTA(r) \
127	((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndtmsg))))
128#endif
129#ifndef NDTA_PAYLOAD
130#define NDTA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ndtmsg))
131#endif
132
133#endif /* __LIBNETLINK_H__ */
134
135