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
30 struct nlmsg_list
*next
;
35 struct nlmsg_list
*head
;
36 struct nlmsg_list
*tail
;
41 int rtnl_open(struct rtnl_handle
*rth
, unsigned int subscriptions
)
42 __attribute__((warn_unused_result
));
44 int rtnl_open_byproto(struct rtnl_handle
*rth
, unsigned int subscriptions
,
46 __attribute__((warn_unused_result
));
48 void rtnl_close(struct rtnl_handle
*rth
);
49 int rtnl_wilddump_request(struct rtnl_handle
*rth
, int fam
, int type
)
50 __attribute__((warn_unused_result
));
51 int rtnl_wilddump_req_filter(struct rtnl_handle
*rth
, int fam
, int type
,
53 __attribute__((warn_unused_result
));
55 typedef int (*req_filter_fn_t
)(struct nlmsghdr
*nlh
, int reqlen
);
57 int rtnl_wilddump_req_filter_fn(struct rtnl_handle
*rth
, int fam
, int type
,
59 __attribute__((warn_unused_result
));
60 int rtnl_wilddump_stats_req_filter(struct rtnl_handle
*rth
, int fam
, int type
,
62 __attribute__((warn_unused_result
));
63 int rtnl_dump_request(struct rtnl_handle
*rth
, int type
, void *req
,
65 __attribute__((warn_unused_result
));
66 int rtnl_dump_request_n(struct rtnl_handle
*rth
, struct nlmsghdr
*n
)
67 __attribute__((warn_unused_result
));
69 struct rtnl_ctrl_data
{
73 typedef int (*rtnl_filter_t
)(const struct sockaddr_nl
*,
74 struct nlmsghdr
*n
, void *);
76 typedef int (*rtnl_listen_filter_t
)(const struct sockaddr_nl
*,
77 struct rtnl_ctrl_data
*,
78 struct nlmsghdr
*n
, void *);
80 typedef int (*nl_ext_ack_fn_t
)(const char *errmsg
, uint32_t off
,
81 const struct nlmsghdr
*inner_nlh
);
83 struct rtnl_dump_filter_arg
{
89 int rtnl_dump_filter_l(struct rtnl_handle
*rth
,
90 const struct rtnl_dump_filter_arg
*arg
);
91 int rtnl_dump_filter_nc(struct rtnl_handle
*rth
,
93 void *arg
, __u16 nc_flags
);
94 #define rtnl_dump_filter(rth, filter, arg) \
95 rtnl_dump_filter_nc(rth, filter, arg, 0)
96 int rtnl_talk(struct rtnl_handle
*rtnl
, struct nlmsghdr
*n
,
97 struct nlmsghdr
**answer
)
98 __attribute__((warn_unused_result
));
99 int rtnl_talk_iov(struct rtnl_handle
*rtnl
, struct iovec
*iovec
, size_t iovlen
,
100 struct nlmsghdr
**answer
)
101 __attribute__((warn_unused_result
));
102 int rtnl_talk_extack(struct rtnl_handle
*rtnl
, struct nlmsghdr
*n
,
103 struct nlmsghdr
**answer
, nl_ext_ack_fn_t errfn
)
104 __attribute__((warn_unused_result
));
105 int rtnl_talk_suppress_rtnl_errmsg(struct rtnl_handle
*rtnl
, struct nlmsghdr
*n
,
106 struct nlmsghdr
**answer
)
107 __attribute__((warn_unused_result
));
108 int rtnl_send(struct rtnl_handle
*rth
, const void *buf
, int)
109 __attribute__((warn_unused_result
));
110 int rtnl_send_check(struct rtnl_handle
*rth
, const void *buf
, int)
111 __attribute__((warn_unused_result
));
113 int addattr(struct nlmsghdr
*n
, int maxlen
, int type
);
114 int addattr8(struct nlmsghdr
*n
, int maxlen
, int type
, __u8 data
);
115 int addattr16(struct nlmsghdr
*n
, int maxlen
, int type
, __u16 data
);
116 int addattr32(struct nlmsghdr
*n
, int maxlen
, int type
, __u32 data
);
117 int addattr64(struct nlmsghdr
*n
, int maxlen
, int type
, __u64 data
);
118 int addattrstrz(struct nlmsghdr
*n
, int maxlen
, int type
, const char *data
);
120 int addattr_l(struct nlmsghdr
*n
, int maxlen
, int type
,
121 const void *data
, int alen
);
122 int addraw_l(struct nlmsghdr
*n
, int maxlen
, const void *data
, int len
);
123 struct rtattr
*addattr_nest(struct nlmsghdr
*n
, int maxlen
, int type
);
124 int addattr_nest_end(struct nlmsghdr
*n
, struct rtattr
*nest
);
125 struct rtattr
*addattr_nest_compat(struct nlmsghdr
*n
, int maxlen
, int type
,
126 const void *data
, int len
);
127 int addattr_nest_compat_end(struct nlmsghdr
*n
, struct rtattr
*nest
);
128 int rta_addattr8(struct rtattr
*rta
, int maxlen
, int type
, __u8 data
);
129 int rta_addattr16(struct rtattr
*rta
, int maxlen
, int type
, __u16 data
);
130 int rta_addattr32(struct rtattr
*rta
, int maxlen
, int type
, __u32 data
);
131 int rta_addattr64(struct rtattr
*rta
, int maxlen
, int type
, __u64 data
);
132 int rta_addattr_l(struct rtattr
*rta
, int maxlen
, int type
,
133 const void *data
, int alen
);
135 int parse_rtattr(struct rtattr
*tb
[], int max
, struct rtattr
*rta
, int len
);
136 int parse_rtattr_flags(struct rtattr
*tb
[], int max
, struct rtattr
*rta
,
137 int len
, unsigned short flags
);
138 int parse_rtattr_byindex(struct rtattr
*tb
[], int max
,
139 struct rtattr
*rta
, int len
);
140 struct rtattr
*parse_rtattr_one(int type
, struct rtattr
*rta
, int len
);
141 int __parse_rtattr_nested_compat(struct rtattr
*tb
[], int max
, struct rtattr
*rta
, int len
);
143 struct rtattr
*rta_nest(struct rtattr
*rta
, int maxlen
, int type
);
144 int rta_nest_end(struct rtattr
*rta
, struct rtattr
*nest
);
146 #define RTA_TAIL(rta) \
147 ((struct rtattr *) (((void *) (rta)) + \
148 RTA_ALIGN((rta)->rta_len)))
150 #define parse_rtattr_nested(tb, max, rta) \
151 (parse_rtattr((tb), (max), RTA_DATA(rta), RTA_PAYLOAD(rta)))
153 #define parse_rtattr_one_nested(type, rta) \
154 (parse_rtattr_one(type, RTA_DATA(rta), RTA_PAYLOAD(rta)))
156 #define parse_rtattr_nested_compat(tb, max, rta, data, len) \
157 ({ data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL; \
158 __parse_rtattr_nested_compat(tb, max, rta, len); })
160 static inline __u8
rta_getattr_u8(const struct rtattr
*rta
)
162 return *(__u8
*)RTA_DATA(rta
);
164 static inline __u16
rta_getattr_u16(const struct rtattr
*rta
)
166 return *(__u16
*)RTA_DATA(rta
);
168 static inline __be16
rta_getattr_be16(const struct rtattr
*rta
)
170 return ntohs(rta_getattr_u16(rta
));
172 static inline __u32
rta_getattr_u32(const struct rtattr
*rta
)
174 return *(__u32
*)RTA_DATA(rta
);
176 static inline __be32
rta_getattr_be32(const struct rtattr
*rta
)
178 return ntohl(rta_getattr_u32(rta
));
180 static inline __u64
rta_getattr_u64(const struct rtattr
*rta
)
184 memcpy(&tmp
, RTA_DATA(rta
), sizeof(__u64
));
187 static inline const char *rta_getattr_str(const struct rtattr
*rta
)
189 return (const char *)RTA_DATA(rta
);
192 int rtnl_listen_all_nsid(struct rtnl_handle
*);
193 int rtnl_listen(struct rtnl_handle
*, rtnl_listen_filter_t handler
,
195 int rtnl_from_file(FILE *, rtnl_listen_filter_t handler
,
198 #define NLMSG_TAIL(nmsg) \
199 ((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
203 ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
206 #define IFA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ifaddrmsg))
210 #define IFLA_RTA(r) \
211 ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ifinfomsg))))
214 #define IFLA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg))
219 ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
222 #define NDA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ndmsg))
226 #define NDTA_RTA(r) \
227 ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndtmsg))))
230 #define NDTA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ndtmsg))
234 #define NETNS_RTA(r) \
235 ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct rtgenmsg))))
237 #ifndef NETNS_PAYLOAD
238 #define NETNS_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct rtgenmsg))
241 #ifndef IFLA_STATS_RTA
242 #define IFLA_STATS_RTA(r) \
243 ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct if_stats_msg))))
246 /* User defined nlmsg_type which is used mostly for logging netlink
247 * messages from dump file */
248 #define NLMSG_TSTAMP 15
250 #endif /* __LIBNETLINK_H__ */