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
14 struct rtnl_handle
15 {
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 int flags;
25 };
26
27 extern int rcvbuf;
28
29 int rtnl_open(struct rtnl_handle *rth, unsigned subscriptions)
30 __attribute__((warn_unused_result));
31
32 int rtnl_open_byproto(struct rtnl_handle *rth, unsigned subscriptions,
33 int protocol)
34 __attribute__((warn_unused_result));
35
36 void rtnl_close(struct rtnl_handle *rth);
37 int rtnl_wilddump_request(struct rtnl_handle *rth, int fam, int type)
38 __attribute__((warn_unused_result));
39 int rtnl_wilddump_req_filter(struct rtnl_handle *rth, int fam, int type,
40 __u32 filt_mask)
41 __attribute__((warn_unused_result));
42 int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req,
43 int len)
44 __attribute__((warn_unused_result));
45 int rtnl_dump_request_n(struct rtnl_handle *rth, struct nlmsghdr *n)
46 __attribute__((warn_unused_result));
47
48 struct rtnl_ctrl_data {
49 int nsid;
50 };
51
52 typedef int (*rtnl_filter_t)(const struct sockaddr_nl *,
53 struct nlmsghdr *n, void *);
54
55 typedef int (*rtnl_listen_filter_t)(const struct sockaddr_nl *,
56 struct rtnl_ctrl_data *,
57 struct nlmsghdr *n, void *);
58
59 struct rtnl_dump_filter_arg
60 {
61 rtnl_filter_t filter;
62 void *arg1;
63 __u16 nc_flags;
64 };
65
66 int rtnl_dump_filter_l(struct rtnl_handle *rth,
67 const struct rtnl_dump_filter_arg *arg);
68 int rtnl_dump_filter_nc(struct rtnl_handle *rth,
69 rtnl_filter_t filter,
70 void *arg, __u16 nc_flags);
71 #define rtnl_dump_filter(rth, filter, arg) \
72 rtnl_dump_filter_nc(rth, filter, arg, 0)
73 int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
74 struct nlmsghdr *answer, size_t len)
75 __attribute__((warn_unused_result));
76 int rtnl_send(struct rtnl_handle *rth, const void *buf, int)
77 __attribute__((warn_unused_result));
78 int rtnl_send_check(struct rtnl_handle *rth, const void *buf, int)
79 __attribute__((warn_unused_result));
80
81 int addattr(struct nlmsghdr *n, int maxlen, int type);
82 int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data);
83 int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data);
84 int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data);
85 int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data);
86 int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *data);
87
88 int addattr_l(struct nlmsghdr *n, int maxlen, int type,
89 const void *data, int alen);
90 int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len);
91 struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type);
92 int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest);
93 struct rtattr *addattr_nest_compat(struct nlmsghdr *n, int maxlen, int type,
94 const void *data, int len);
95 int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *nest);
96 int rta_addattr8(struct rtattr *rta, int maxlen, int type, __u8 data);
97 int rta_addattr16(struct rtattr *rta, int maxlen, int type, __u16 data);
98 int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data);
99 int rta_addattr64(struct rtattr *rta, int maxlen, int type, __u64 data);
100 int rta_addattr_l(struct rtattr *rta, int maxlen, int type,
101 const void *data, int alen);
102
103 int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len);
104 int parse_rtattr_flags(struct rtattr *tb[], int max, struct rtattr *rta,
105 int len, unsigned short flags);
106 int parse_rtattr_byindex(struct rtattr *tb[], int max,
107 struct rtattr *rta, int len);
108 struct rtattr *parse_rtattr_one(int type, struct rtattr *rta, int len);
109 int __parse_rtattr_nested_compat(struct rtattr *tb[], int max, struct rtattr *rta, int len);
110
111 struct rtattr *rta_nest(struct rtattr *rta, int maxlen, int type);
112 int rta_nest_end(struct rtattr *rta, struct rtattr *nest);
113
114 #define RTA_TAIL(rta) \
115 ((struct rtattr *) (((void *) (rta)) + \
116 RTA_ALIGN((rta)->rta_len)))
117
118 #define parse_rtattr_nested(tb, max, rta) \
119 (parse_rtattr((tb), (max), RTA_DATA(rta), RTA_PAYLOAD(rta)))
120
121 #define parse_rtattr_one_nested(type, rta) \
122 (parse_rtattr_one(type, RTA_DATA(rta), RTA_PAYLOAD(rta)))
123
124 #define parse_rtattr_nested_compat(tb, max, rta, data, len) \
125 ({ data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL; \
126 __parse_rtattr_nested_compat(tb, max, rta, len); })
127
rta_getattr_u8(const struct rtattr * rta)128 static inline __u8 rta_getattr_u8(const struct rtattr *rta)
129 {
130 return *(__u8 *)RTA_DATA(rta);
131 }
rta_getattr_u16(const struct rtattr * rta)132 static inline __u16 rta_getattr_u16(const struct rtattr *rta)
133 {
134 return *(__u16 *)RTA_DATA(rta);
135 }
rta_getattr_u32(const struct rtattr * rta)136 static inline __u32 rta_getattr_u32(const struct rtattr *rta)
137 {
138 return *(__u32 *)RTA_DATA(rta);
139 }
rta_getattr_u64(const struct rtattr * rta)140 static inline __u64 rta_getattr_u64(const struct rtattr *rta)
141 {
142 __u64 tmp;
143 memcpy(&tmp, RTA_DATA(rta), sizeof(__u64));
144 return tmp;
145 }
rta_getattr_str(const struct rtattr * rta)146 static inline const char *rta_getattr_str(const struct rtattr *rta)
147 {
148 return (const char *)RTA_DATA(rta);
149 }
150
151 int rtnl_listen_all_nsid(struct rtnl_handle *);
152 int rtnl_listen(struct rtnl_handle *, rtnl_listen_filter_t handler,
153 void *jarg);
154 int rtnl_from_file(FILE *, rtnl_listen_filter_t handler,
155 void *jarg);
156
157 #define NLMSG_TAIL(nmsg) \
158 ((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
159
160 #ifndef IFA_RTA
161 #define IFA_RTA(r) \
162 ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
163 #endif
164 #ifndef IFA_PAYLOAD
165 #define IFA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifaddrmsg))
166 #endif
167
168 #ifndef IFLA_RTA
169 #define IFLA_RTA(r) \
170 ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifinfomsg))))
171 #endif
172 #ifndef IFLA_PAYLOAD
173 #define IFLA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifinfomsg))
174 #endif
175
176 #ifndef NDA_RTA
177 #define NDA_RTA(r) \
178 ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
179 #endif
180 #ifndef NDA_PAYLOAD
181 #define NDA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ndmsg))
182 #endif
183
184 #ifndef NDTA_RTA
185 #define NDTA_RTA(r) \
186 ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndtmsg))))
187 #endif
188 #ifndef NDTA_PAYLOAD
189 #define NDTA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ndtmsg))
190 #endif
191
192 #ifndef NETNS_RTA
193 #define NETNS_RTA(r) \
194 ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct rtgenmsg))))
195 #endif
196 #ifndef NETNS_PAYLOAD
197 #define NETNS_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct rtgenmsg))
198 #endif
199
200 /* User defined nlmsg_type which is used mostly for logging netlink
201 * messages from dump file */
202 #define NLMSG_TSTAMP 15
203
204 #endif /* __LIBNETLINK_H__ */
205
206