1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LIBNETLINK_H__
3 #define __LIBNETLINK_H__ 1
8 #include <linux/netlink.h>
9 #include <linux/rtnetlink.h>
10 #include <linux/if_link.h>
11 #include <linux/if_addr.h>
12 #include <linux/neighbour.h>
13 #include <linux/netconf.h>
14 #include <arpa/inet.h>
18 struct sockaddr_nl local
;
19 struct sockaddr_nl peer
;
24 #define RTNL_HANDLE_F_LISTEN_ALL_NSID 0x01
25 #define RTNL_HANDLE_F_SUPPRESS_NLERR 0x02
26 #define RTNL_HANDLE_F_STRICT_CHK 0x04
31 struct nlmsg_list
*next
;
36 struct nlmsg_list
*head
;
37 struct nlmsg_list
*tail
;
42 int rtnl_open(struct rtnl_handle
*rth
, unsigned int subscriptions
)
43 __attribute__((warn_unused_result
));
45 int rtnl_open_byproto(struct rtnl_handle
*rth
, unsigned int subscriptions
,
47 __attribute__((warn_unused_result
));
48 int rtnl_add_nl_group(struct rtnl_handle
*rth
, unsigned int group
)
49 __attribute__((warn_unused_result
));
50 void rtnl_close(struct rtnl_handle
*rth
);
51 void rtnl_set_strict_dump(struct rtnl_handle
*rth
);
53 typedef int (*req_filter_fn_t
)(struct nlmsghdr
*nlh
, int reqlen
);
55 int rtnl_addrdump_req(struct rtnl_handle
*rth
, int family
,
56 req_filter_fn_t filter_fn
)
57 __attribute__((warn_unused_result
));
58 int rtnl_addrlbldump_req(struct rtnl_handle
*rth
, int family
)
59 __attribute__((warn_unused_result
));
60 int rtnl_routedump_req(struct rtnl_handle
*rth
, int family
,
61 req_filter_fn_t filter_fn
)
62 __attribute__((warn_unused_result
));
63 int rtnl_ruledump_req(struct rtnl_handle
*rth
, int family
)
64 __attribute__((warn_unused_result
));
65 int rtnl_neighdump_req(struct rtnl_handle
*rth
, int family
,
66 req_filter_fn_t filter_fn
)
67 __attribute__((warn_unused_result
));
68 int rtnl_neightbldump_req(struct rtnl_handle
*rth
, int family
)
69 __attribute__((warn_unused_result
));
70 int rtnl_mdbdump_req(struct rtnl_handle
*rth
, int family
)
71 __attribute__((warn_unused_result
));
72 int rtnl_netconfdump_req(struct rtnl_handle
*rth
, int family
)
73 __attribute__((warn_unused_result
));
75 int rtnl_linkdump_req(struct rtnl_handle
*rth
, int fam
)
76 __attribute__((warn_unused_result
));
77 int rtnl_linkdump_req_filter(struct rtnl_handle
*rth
, int fam
, __u32 filt_mask
)
78 __attribute__((warn_unused_result
));
80 int rtnl_linkdump_req_filter_fn(struct rtnl_handle
*rth
, int fam
,
82 __attribute__((warn_unused_result
));
83 int rtnl_fdb_linkdump_req_filter_fn(struct rtnl_handle
*rth
,
84 req_filter_fn_t filter_fn
)
85 __attribute__((warn_unused_result
));
86 int rtnl_nsiddump_req_filter_fn(struct rtnl_handle
*rth
, int family
,
87 req_filter_fn_t filter_fn
)
88 __attribute__((warn_unused_result
));
89 int rtnl_statsdump_req_filter(struct rtnl_handle
*rth
, int fam
, __u32 filt_mask
)
90 __attribute__((warn_unused_result
));
91 int rtnl_dump_request(struct rtnl_handle
*rth
, int type
, void *req
,
93 __attribute__((warn_unused_result
));
94 int rtnl_dump_request_n(struct rtnl_handle
*rth
, struct nlmsghdr
*n
)
95 __attribute__((warn_unused_result
));
97 int rtnl_nexthopdump_req(struct rtnl_handle
*rth
, int family
,
98 req_filter_fn_t filter_fn
)
99 __attribute__((warn_unused_result
));
101 struct rtnl_ctrl_data
{
105 typedef int (*rtnl_filter_t
)(struct nlmsghdr
*n
, void *);
107 typedef int (*rtnl_listen_filter_t
)(struct rtnl_ctrl_data
*,
108 struct nlmsghdr
*n
, void *);
110 typedef int (*nl_ext_ack_fn_t
)(const char *errmsg
, uint32_t off
,
111 const struct nlmsghdr
*inner_nlh
);
113 struct rtnl_dump_filter_arg
{
114 rtnl_filter_t filter
;
119 int rtnl_dump_filter_nc(struct rtnl_handle
*rth
,
120 rtnl_filter_t filter
,
121 void *arg
, __u16 nc_flags
);
122 #define rtnl_dump_filter(rth, filter, arg) \
123 rtnl_dump_filter_nc(rth, filter, arg, 0)
124 int rtnl_talk(struct rtnl_handle
*rtnl
, struct nlmsghdr
*n
,
125 struct nlmsghdr
**answer
)
126 __attribute__((warn_unused_result
));
127 int rtnl_talk_iov(struct rtnl_handle
*rtnl
, struct iovec
*iovec
, size_t iovlen
,
128 struct nlmsghdr
**answer
)
129 __attribute__((warn_unused_result
));
130 int rtnl_talk_suppress_rtnl_errmsg(struct rtnl_handle
*rtnl
, struct nlmsghdr
*n
,
131 struct nlmsghdr
**answer
)
132 __attribute__((warn_unused_result
));
133 int rtnl_send(struct rtnl_handle
*rth
, const void *buf
, int)
134 __attribute__((warn_unused_result
));
135 int rtnl_send_check(struct rtnl_handle
*rth
, const void *buf
, int)
136 __attribute__((warn_unused_result
));
137 int nl_dump_ext_ack(const struct nlmsghdr
*nlh
, nl_ext_ack_fn_t errfn
);
138 int nl_dump_ext_ack_done(const struct nlmsghdr
*nlh
, int error
);
140 int addattr(struct nlmsghdr
*n
, int maxlen
, int type
);
141 int addattr8(struct nlmsghdr
*n
, int maxlen
, int type
, __u8 data
);
142 int addattr16(struct nlmsghdr
*n
, int maxlen
, int type
, __u16 data
);
143 int addattr32(struct nlmsghdr
*n
, int maxlen
, int type
, __u32 data
);
144 int addattr64(struct nlmsghdr
*n
, int maxlen
, int type
, __u64 data
);
145 int addattrstrz(struct nlmsghdr
*n
, int maxlen
, int type
, const char *data
);
147 int addattr_l(struct nlmsghdr
*n
, int maxlen
, int type
,
148 const void *data
, int alen
);
149 int addraw_l(struct nlmsghdr
*n
, int maxlen
, const void *data
, int len
);
150 struct rtattr
*addattr_nest(struct nlmsghdr
*n
, int maxlen
, int type
);
151 int addattr_nest_end(struct nlmsghdr
*n
, struct rtattr
*nest
);
152 struct rtattr
*addattr_nest_compat(struct nlmsghdr
*n
, int maxlen
, int type
,
153 const void *data
, int len
);
154 int addattr_nest_compat_end(struct nlmsghdr
*n
, struct rtattr
*nest
);
155 int rta_addattr8(struct rtattr
*rta
, int maxlen
, int type
, __u8 data
);
156 int rta_addattr16(struct rtattr
*rta
, int maxlen
, int type
, __u16 data
);
157 int rta_addattr32(struct rtattr
*rta
, int maxlen
, int type
, __u32 data
);
158 int rta_addattr64(struct rtattr
*rta
, int maxlen
, int type
, __u64 data
);
159 int rta_addattr_l(struct rtattr
*rta
, int maxlen
, int type
,
160 const void *data
, int alen
);
162 int parse_rtattr(struct rtattr
*tb
[], int max
, struct rtattr
*rta
, int len
);
163 int parse_rtattr_flags(struct rtattr
*tb
[], int max
, struct rtattr
*rta
,
164 int len
, unsigned short flags
);
165 struct rtattr
*parse_rtattr_one(int type
, struct rtattr
*rta
, int len
);
166 int __parse_rtattr_nested_compat(struct rtattr
*tb
[], int max
, struct rtattr
*rta
, int len
);
168 struct rtattr
*rta_nest(struct rtattr
*rta
, int maxlen
, int type
);
169 int rta_nest_end(struct rtattr
*rta
, struct rtattr
*nest
);
171 #define RTA_TAIL(rta) \
172 ((struct rtattr *) (((void *) (rta)) + \
173 RTA_ALIGN((rta)->rta_len)))
175 #define parse_rtattr_nested(tb, max, rta) \
176 (parse_rtattr_flags((tb), (max), RTA_DATA(rta), RTA_PAYLOAD(rta), \
179 #define parse_rtattr_one_nested(type, rta) \
180 (parse_rtattr_one(type, RTA_DATA(rta), RTA_PAYLOAD(rta)))
182 #define parse_rtattr_nested_compat(tb, max, rta, data, len) \
183 ({ data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL; \
184 __parse_rtattr_nested_compat(tb, max, rta, len); })
186 static inline __u8
rta_getattr_u8(const struct rtattr
*rta
)
188 return *(__u8
*)RTA_DATA(rta
);
190 static inline __u16
rta_getattr_u16(const struct rtattr
*rta
)
192 return *(__u16
*)RTA_DATA(rta
);
194 static inline __be16
rta_getattr_be16(const struct rtattr
*rta
)
196 return ntohs(rta_getattr_u16(rta
));
198 static inline __u32
rta_getattr_u32(const struct rtattr
*rta
)
200 return *(__u32
*)RTA_DATA(rta
);
202 static inline __be32
rta_getattr_be32(const struct rtattr
*rta
)
204 return ntohl(rta_getattr_u32(rta
));
206 static inline __u64
rta_getattr_u64(const struct rtattr
*rta
)
210 memcpy(&tmp
, RTA_DATA(rta
), sizeof(__u64
));
213 static inline __s32
rta_getattr_s32(const struct rtattr
*rta
)
215 return *(__s32
*)RTA_DATA(rta
);
217 static inline __s64
rta_getattr_s64(const struct rtattr
*rta
)
221 memcpy(&tmp
, RTA_DATA(rta
), sizeof(tmp
));
224 static inline const char *rta_getattr_str(const struct rtattr
*rta
)
226 return (const char *)RTA_DATA(rta
);
229 int rtnl_listen_all_nsid(struct rtnl_handle
*);
230 int rtnl_listen(struct rtnl_handle
*, rtnl_listen_filter_t handler
,
232 int rtnl_from_file(FILE *, rtnl_listen_filter_t handler
,
235 #define NLMSG_TAIL(nmsg) \
236 ((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
240 ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
243 #define IFA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ifaddrmsg))
247 #define IFLA_RTA(r) \
248 ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ifinfomsg))))
251 #define IFLA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg))
256 ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
259 #define NDA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ndmsg))
263 #define NDTA_RTA(r) \
264 ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndtmsg))))
267 #define NDTA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ndtmsg))
271 #define NETNS_RTA(r) \
272 ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct rtgenmsg))))
274 #ifndef NETNS_PAYLOAD
275 #define NETNS_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct rtgenmsg))
278 #ifndef IFLA_STATS_RTA
279 #define IFLA_STATS_RTA(r) \
280 ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct if_stats_msg))))
283 /* User defined nlmsg_type which is used mostly for logging netlink
284 * messages from dump file */
285 #define NLMSG_TSTAMP 15
287 #endif /* __LIBNETLINK_H__ */