1 #ifndef __LIBNETLINK_H__
2 #define __LIBNETLINK_H__ 1
3
4 #include <stdio.h>
5 #include <string.h>
6 #include <asm/types.h>
7 #include <linux/netlink.h>
8 #include <linux/rtnetlink.h>
9 #include <linux/if_link.h>
10 #include <linux/if_addr.h>
11 #include <linux/neighbour.h>
12 #include <linux/netconf.h>
13 #include <arpa/inet.h>
14
15 struct rtnl_handle {
16 int fd;
17 struct sockaddr_nl local;
18 struct sockaddr_nl peer;
19 __u32 seq;
20 __u32 dump;
21 int proto;
22 FILE *dump_fp;
23 #define RTNL_HANDLE_F_LISTEN_ALL_NSID 0x01
24 #define RTNL_HANDLE_F_SUPPRESS_NLERR 0x02
25 int flags;
26 };
27
28 struct nlmsg_list {
29 struct nlmsg_list *next;
30 struct nlmsghdr h;
31 };
32
33 struct nlmsg_chain {
34 struct nlmsg_list *head;
35 struct nlmsg_list *tail;
36 };
37
38 extern int rcvbuf;
39
40 int rtnl_open(struct rtnl_handle *rth, unsigned int subscriptions)
41 __attribute__((warn_unused_result));
42
43 int rtnl_open_byproto(struct rtnl_handle *rth, unsigned int subscriptions,
44 int protocol)
45 __attribute__((warn_unused_result));
46
47 void rtnl_close(struct rtnl_handle *rth);
48 int rtnl_wilddump_request(struct rtnl_handle *rth, int fam, int type)
49 __attribute__((warn_unused_result));
50 int rtnl_wilddump_req_filter(struct rtnl_handle *rth, int fam, int type,
51 __u32 filt_mask)
52 __attribute__((warn_unused_result));
53
54 typedef int (*req_filter_fn_t)(struct nlmsghdr *nlh, int reqlen);
55
56 int rtnl_wilddump_req_filter_fn(struct rtnl_handle *rth, int fam, int type,
57 req_filter_fn_t fn)
58 __attribute__((warn_unused_result));
59 int rtnl_wilddump_stats_req_filter(struct rtnl_handle *rth, int fam, int type,
60 __u32 filt_mask)
61 __attribute__((warn_unused_result));
62 int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req,
63 int len)
64 __attribute__((warn_unused_result));
65 int rtnl_dump_request_n(struct rtnl_handle *rth, struct nlmsghdr *n)
66 __attribute__((warn_unused_result));
67
68 struct rtnl_ctrl_data {
69 int nsid;
70 };
71
72 typedef int (*rtnl_filter_t)(const struct sockaddr_nl *,
73 struct nlmsghdr *n, void *);
74
75 typedef int (*rtnl_listen_filter_t)(const struct sockaddr_nl *,
76 struct rtnl_ctrl_data *,
77 struct nlmsghdr *n, void *);
78
79 typedef int (*nl_ext_ack_fn_t)(const char *errmsg, uint32_t off,
80 const struct nlmsghdr *inner_nlh);
81
82 struct rtnl_dump_filter_arg {
83 rtnl_filter_t filter;
84 void *arg1;
85 __u16 nc_flags;
86 };
87
88 int rtnl_dump_filter_l(struct rtnl_handle *rth,
89 const struct rtnl_dump_filter_arg *arg);
90 int rtnl_dump_filter_nc(struct rtnl_handle *rth,
91 rtnl_filter_t filter,
92 void *arg, __u16 nc_flags);
93 #define rtnl_dump_filter(rth, filter, arg) \
94 rtnl_dump_filter_nc(rth, filter, arg, 0)
95 int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
96 struct nlmsghdr *answer, size_t len)
97 __attribute__((warn_unused_result));
98 int rtnl_talk_extack(struct rtnl_handle *rtnl, struct nlmsghdr *n,
99 struct nlmsghdr *answer, size_t len, nl_ext_ack_fn_t errfn)
100 __attribute__((warn_unused_result));
101 int rtnl_talk_suppress_rtnl_errmsg(struct rtnl_handle *rtnl, struct nlmsghdr *n,
102 struct nlmsghdr *answer, size_t len)
103 __attribute__((warn_unused_result));
104 int rtnl_send(struct rtnl_handle *rth, const void *buf, int)
105 __attribute__((warn_unused_result));
106 int rtnl_send_check(struct rtnl_handle *rth, const void *buf, int)
107 __attribute__((warn_unused_result));
108
109 int addattr(struct nlmsghdr *n, int maxlen, int type);
110 int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data);
111 int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data);
112 int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data);
113 int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data);
114 int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *data);
115
116 int addattr_l(struct nlmsghdr *n, int maxlen, int type,
117 const void *data, int alen);
118 int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len);
119 struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type);
120 int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest);
121 struct rtattr *addattr_nest_compat(struct nlmsghdr *n, int maxlen, int type,
122 const void *data, int len);
123 int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *nest);
124 int rta_addattr8(struct rtattr *rta, int maxlen, int type, __u8 data);
125 int rta_addattr16(struct rtattr *rta, int maxlen, int type, __u16 data);
126 int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data);
127 int rta_addattr64(struct rtattr *rta, int maxlen, int type, __u64 data);
128 int rta_addattr_l(struct rtattr *rta, int maxlen, int type,
129 const void *data, int alen);
130
131 int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len);
132 int parse_rtattr_flags(struct rtattr *tb[], int max, struct rtattr *rta,
133 int len, unsigned short flags);
134 int parse_rtattr_byindex(struct rtattr *tb[], int max,
135 struct rtattr *rta, int len);
136 struct rtattr *parse_rtattr_one(int type, struct rtattr *rta, int len);
137 int __parse_rtattr_nested_compat(struct rtattr *tb[], int max, struct rtattr *rta, int len);
138
139 struct rtattr *rta_nest(struct rtattr *rta, int maxlen, int type);
140 int rta_nest_end(struct rtattr *rta, struct rtattr *nest);
141
142 #define RTA_TAIL(rta) \
143 ((struct rtattr *) (((void *) (rta)) + \
144 RTA_ALIGN((rta)->rta_len)))
145
146 #define parse_rtattr_nested(tb, max, rta) \
147 (parse_rtattr((tb), (max), RTA_DATA(rta), RTA_PAYLOAD(rta)))
148
149 #define parse_rtattr_one_nested(type, rta) \
150 (parse_rtattr_one(type, RTA_DATA(rta), RTA_PAYLOAD(rta)))
151
152 #define parse_rtattr_nested_compat(tb, max, rta, data, len) \
153 ({ data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL; \
154 __parse_rtattr_nested_compat(tb, max, rta, len); })
155
rta_getattr_u8(const struct rtattr * rta)156 static inline __u8 rta_getattr_u8(const struct rtattr *rta)
157 {
158 return *(__u8 *)RTA_DATA(rta);
159 }
rta_getattr_u16(const struct rtattr * rta)160 static inline __u16 rta_getattr_u16(const struct rtattr *rta)
161 {
162 return *(__u16 *)RTA_DATA(rta);
163 }
rta_getattr_be16(const struct rtattr * rta)164 static inline __be16 rta_getattr_be16(const struct rtattr *rta)
165 {
166 return ntohs(rta_getattr_u16(rta));
167 }
rta_getattr_u32(const struct rtattr * rta)168 static inline __u32 rta_getattr_u32(const struct rtattr *rta)
169 {
170 return *(__u32 *)RTA_DATA(rta);
171 }
rta_getattr_be32(const struct rtattr * rta)172 static inline __be32 rta_getattr_be32(const struct rtattr *rta)
173 {
174 return ntohl(rta_getattr_u32(rta));
175 }
rta_getattr_u64(const struct rtattr * rta)176 static inline __u64 rta_getattr_u64(const struct rtattr *rta)
177 {
178 __u64 tmp;
179
180 memcpy(&tmp, RTA_DATA(rta), sizeof(__u64));
181 return tmp;
182 }
rta_getattr_str(const struct rtattr * rta)183 static inline const char *rta_getattr_str(const struct rtattr *rta)
184 {
185 return (const char *)RTA_DATA(rta);
186 }
187
188 int rtnl_listen_all_nsid(struct rtnl_handle *);
189 int rtnl_listen(struct rtnl_handle *, rtnl_listen_filter_t handler,
190 void *jarg);
191 int rtnl_from_file(FILE *, rtnl_listen_filter_t handler,
192 void *jarg);
193
194 #define NLMSG_TAIL(nmsg) \
195 ((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
196
197 #ifndef IFA_RTA
198 #define IFA_RTA(r) \
199 ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
200 #endif
201 #ifndef IFA_PAYLOAD
202 #define IFA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ifaddrmsg))
203 #endif
204
205 #ifndef IFLA_RTA
206 #define IFLA_RTA(r) \
207 ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ifinfomsg))))
208 #endif
209 #ifndef IFLA_PAYLOAD
210 #define IFLA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg))
211 #endif
212
213 #ifndef NDA_RTA
214 #define NDA_RTA(r) \
215 ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
216 #endif
217 #ifndef NDA_PAYLOAD
218 #define NDA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ndmsg))
219 #endif
220
221 #ifndef NDTA_RTA
222 #define NDTA_RTA(r) \
223 ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndtmsg))))
224 #endif
225 #ifndef NDTA_PAYLOAD
226 #define NDTA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ndtmsg))
227 #endif
228
229 #ifndef NETNS_RTA
230 #define NETNS_RTA(r) \
231 ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct rtgenmsg))))
232 #endif
233 #ifndef NETNS_PAYLOAD
234 #define NETNS_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct rtgenmsg))
235 #endif
236
237 #ifndef IFLA_STATS_RTA
238 #define IFLA_STATS_RTA(r) \
239 ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct if_stats_msg))))
240 #endif
241
242 /* User defined nlmsg_type which is used mostly for logging netlink
243 * messages from dump file */
244 #define NLMSG_TSTAMP 15
245
246 #endif /* __LIBNETLINK_H__ */
247