]>
Commit | Line | Data |
---|---|---|
aba5acdf SH |
1 | /* |
2 | * libnetlink.c RTnetlink service routines. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <stdio.h> | |
14 | #include <stdlib.h> | |
463d9efa | 15 | #include <stdbool.h> |
aba5acdf | 16 | #include <unistd.h> |
aba5acdf SH |
17 | #include <fcntl.h> |
18 | #include <net/if_arp.h> | |
19 | #include <sys/socket.h> | |
20 | #include <netinet/in.h> | |
21 | #include <string.h> | |
22 | #include <errno.h> | |
23 | #include <time.h> | |
24 | #include <sys/uio.h> | |
b05d9a3d | 25 | #include <linux/fib_rules.h> |
39360023 | 26 | #include <linux/if_addrlabel.h> |
9dbe6df4 | 27 | #include <linux/if_bridge.h> |
aba5acdf SH |
28 | |
29 | #include "libnetlink.h" | |
30 | ||
92e03242 DA |
31 | #define __aligned(x) __attribute__((aligned(x))) |
32 | ||
449b824a ND |
33 | #ifndef SOL_NETLINK |
34 | #define SOL_NETLINK 270 | |
35 | #endif | |
36 | ||
c079e121 SH |
37 | #ifndef MIN |
38 | #define MIN(a, b) ((a) < (b) ? (a) : (b)) | |
39 | #endif | |
40 | ||
7f03191f PM |
41 | int rcvbuf = 1024 * 1024; |
42 | ||
b6432e68 SH |
43 | #ifdef HAVE_LIBMNL |
44 | #include <libmnl/libmnl.h> | |
45 | ||
46 | static const enum mnl_attr_data_type extack_policy[NLMSGERR_ATTR_MAX + 1] = { | |
47 | [NLMSGERR_ATTR_MSG] = MNL_TYPE_NUL_STRING, | |
48 | [NLMSGERR_ATTR_OFFS] = MNL_TYPE_U32, | |
49 | }; | |
50 | ||
51 | static int err_attr_cb(const struct nlattr *attr, void *data) | |
52 | { | |
53 | const struct nlattr **tb = data; | |
54 | uint16_t type; | |
55 | ||
e5fa0e6f DA |
56 | if (mnl_attr_type_valid(attr, NLMSGERR_ATTR_MAX) < 0) { |
57 | fprintf(stderr, "Invalid extack attribute\n"); | |
b6432e68 | 58 | return MNL_CB_ERROR; |
e5fa0e6f | 59 | } |
b6432e68 SH |
60 | |
61 | type = mnl_attr_get_type(attr); | |
e5fa0e6f DA |
62 | if (mnl_attr_validate(attr, extack_policy[type]) < 0) { |
63 | fprintf(stderr, "extack attribute %d failed validation\n", | |
64 | type); | |
b6432e68 | 65 | return MNL_CB_ERROR; |
e5fa0e6f | 66 | } |
b6432e68 SH |
67 | |
68 | tb[type] = attr; | |
69 | return MNL_CB_OK; | |
70 | } | |
71 | ||
2750252d DA |
72 | static void print_ext_ack_msg(bool is_err, const char *msg) |
73 | { | |
74 | fprintf(stderr, "%s: %s", is_err ? "Error" : "Warning", msg); | |
75 | if (msg[strlen(msg) - 1] != '.') | |
76 | fprintf(stderr, "."); | |
77 | fprintf(stderr, "\n"); | |
78 | } | |
79 | ||
b6432e68 | 80 | /* dump netlink extended ack error message */ |
049c5853 | 81 | int nl_dump_ext_ack(const struct nlmsghdr *nlh, nl_ext_ack_fn_t errfn) |
b6432e68 | 82 | { |
e5fa0e6f | 83 | struct nlattr *tb[NLMSGERR_ATTR_MAX + 1] = {}; |
b6432e68 SH |
84 | const struct nlmsgerr *err = mnl_nlmsg_get_payload(nlh); |
85 | const struct nlmsghdr *err_nlh = NULL; | |
86 | unsigned int hlen = sizeof(*err); | |
844c37b4 | 87 | const char *msg = NULL; |
b6432e68 SH |
88 | uint32_t off = 0; |
89 | ||
b6432e68 SH |
90 | /* no TLVs, nothing to do here */ |
91 | if (!(nlh->nlmsg_flags & NLM_F_ACK_TLVS)) | |
92 | return 0; | |
93 | ||
94 | /* if NLM_F_CAPPED is set then the inner err msg was capped */ | |
95 | if (!(nlh->nlmsg_flags & NLM_F_CAPPED)) | |
96 | hlen += mnl_nlmsg_get_payload_len(&err->msg); | |
97 | ||
e5fa0e6f DA |
98 | if (mnl_attr_parse(nlh, hlen, err_attr_cb, tb) != MNL_CB_OK) |
99 | return 0; | |
b6432e68 SH |
100 | |
101 | if (tb[NLMSGERR_ATTR_MSG]) | |
844c37b4 | 102 | msg = mnl_attr_get_str(tb[NLMSGERR_ATTR_MSG]); |
b6432e68 SH |
103 | |
104 | if (tb[NLMSGERR_ATTR_OFFS]) { | |
105 | off = mnl_attr_get_u32(tb[NLMSGERR_ATTR_OFFS]); | |
106 | ||
107 | if (off > nlh->nlmsg_len) { | |
108 | fprintf(stderr, | |
109 | "Invalid offset for NLMSGERR_ATTR_OFFS\n"); | |
110 | off = 0; | |
111 | } else if (!(nlh->nlmsg_flags & NLM_F_CAPPED)) | |
112 | err_nlh = &err->msg; | |
113 | } | |
114 | ||
fb6cb307 | 115 | if (errfn) |
844c37b4 | 116 | return errfn(msg, off, err_nlh); |
fb6cb307 | 117 | |
844c37b4 DA |
118 | if (msg && *msg != '\0') { |
119 | bool is_err = !!err->error; | |
120 | ||
2750252d DA |
121 | print_ext_ack_msg(is_err, msg); |
122 | return is_err ? 1 : 0; | |
123 | } | |
fb6cb307 | 124 | |
2750252d DA |
125 | return 0; |
126 | } | |
127 | ||
128 | static int nl_dump_ext_ack_done(const struct nlmsghdr *nlh, int error) | |
129 | { | |
130 | struct nlattr *tb[NLMSGERR_ATTR_MAX + 1] = {}; | |
131 | unsigned int hlen = sizeof(int); | |
132 | const char *msg = NULL; | |
133 | ||
134 | if (mnl_attr_parse(nlh, hlen, err_attr_cb, tb) != MNL_CB_OK) | |
135 | return 0; | |
136 | ||
137 | if (tb[NLMSGERR_ATTR_MSG]) | |
138 | msg = mnl_attr_get_str(tb[NLMSGERR_ATTR_MSG]); | |
139 | ||
140 | if (msg && *msg != '\0') { | |
141 | bool is_err = !!error; | |
142 | ||
143 | print_ext_ack_msg(is_err, msg); | |
844c37b4 | 144 | return is_err ? 1 : 0; |
fb6cb307 DA |
145 | } |
146 | ||
147 | return 0; | |
b6432e68 SH |
148 | } |
149 | #else | |
7d23fa55 SH |
150 | #warning "libmnl required for error support" |
151 | ||
b6432e68 | 152 | /* No extended error ack without libmnl */ |
049c5853 | 153 | int nl_dump_ext_ack(const struct nlmsghdr *nlh, nl_ext_ack_fn_t errfn) |
b6432e68 SH |
154 | { |
155 | return 0; | |
156 | } | |
2750252d DA |
157 | |
158 | static int nl_dump_ext_ack_done(const struct nlmsghdr *nlh, int error) | |
159 | { | |
160 | return 0; | |
161 | } | |
b6432e68 SH |
162 | #endif |
163 | ||
aea41afc DA |
164 | /* Older kernels may not support strict dump and filtering */ |
165 | void rtnl_set_strict_dump(struct rtnl_handle *rth) | |
166 | { | |
167 | int one = 1; | |
168 | ||
285033bf DA |
169 | if (setsockopt(rth->fd, SOL_NETLINK, NETLINK_GET_STRICT_CHK, |
170 | &one, sizeof(one)) < 0) | |
171 | return; | |
172 | ||
173 | rth->flags |= RTNL_HANDLE_F_STRICT_CHK; | |
aea41afc DA |
174 | } |
175 | ||
9860becf DA |
176 | int rtnl_add_nl_group(struct rtnl_handle *rth, unsigned int group) |
177 | { | |
178 | return setsockopt(rth->fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, | |
179 | &group, sizeof(group)); | |
180 | } | |
181 | ||
aba5acdf SH |
182 | void rtnl_close(struct rtnl_handle *rth) |
183 | { | |
3bfa73ff SH |
184 | if (rth->fd >= 0) { |
185 | close(rth->fd); | |
186 | rth->fd = -1; | |
187 | } | |
aba5acdf SH |
188 | } |
189 | ||
2c500a4d | 190 | int rtnl_open_byproto(struct rtnl_handle *rth, unsigned int subscriptions, |
8ed63ab1 | 191 | int protocol) |
aba5acdf | 192 | { |
f332d169 | 193 | socklen_t addr_len; |
007d3a3e | 194 | int sndbuf = 32768; |
b6432e68 | 195 | int one = 1; |
aba5acdf | 196 | |
b16621ca | 197 | memset(rth, 0, sizeof(*rth)); |
aba5acdf | 198 | |
8a4025f6 | 199 | rth->proto = protocol; |
bcb9d403 | 200 | rth->fd = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, protocol); |
aba5acdf SH |
201 | if (rth->fd < 0) { |
202 | perror("Cannot open netlink socket"); | |
203 | return -1; | |
204 | } | |
205 | ||
2c500a4d SH |
206 | if (setsockopt(rth->fd, SOL_SOCKET, SO_SNDBUF, |
207 | &sndbuf, sizeof(sndbuf)) < 0) { | |
007d3a3e SH |
208 | perror("SO_SNDBUF"); |
209 | return -1; | |
210 | } | |
211 | ||
2c500a4d SH |
212 | if (setsockopt(rth->fd, SOL_SOCKET, SO_RCVBUF, |
213 | &rcvbuf, sizeof(rcvbuf)) < 0) { | |
007d3a3e SH |
214 | perror("SO_RCVBUF"); |
215 | return -1; | |
216 | } | |
217 | ||
b6432e68 SH |
218 | /* Older kernels may no support extended ACK reporting */ |
219 | setsockopt(rth->fd, SOL_NETLINK, NETLINK_EXT_ACK, | |
220 | &one, sizeof(one)); | |
221 | ||
aba5acdf SH |
222 | memset(&rth->local, 0, sizeof(rth->local)); |
223 | rth->local.nl_family = AF_NETLINK; | |
224 | rth->local.nl_groups = subscriptions; | |
225 | ||
2c500a4d SH |
226 | if (bind(rth->fd, (struct sockaddr *)&rth->local, |
227 | sizeof(rth->local)) < 0) { | |
aba5acdf SH |
228 | perror("Cannot bind netlink socket"); |
229 | return -1; | |
230 | } | |
231 | addr_len = sizeof(rth->local); | |
2c500a4d SH |
232 | if (getsockname(rth->fd, (struct sockaddr *)&rth->local, |
233 | &addr_len) < 0) { | |
aba5acdf SH |
234 | perror("Cannot getsockname"); |
235 | return -1; | |
236 | } | |
237 | if (addr_len != sizeof(rth->local)) { | |
238 | fprintf(stderr, "Wrong address length %d\n", addr_len); | |
239 | return -1; | |
240 | } | |
241 | if (rth->local.nl_family != AF_NETLINK) { | |
2c500a4d SH |
242 | fprintf(stderr, "Wrong address family %d\n", |
243 | rth->local.nl_family); | |
aba5acdf SH |
244 | return -1; |
245 | } | |
246 | rth->seq = time(NULL); | |
247 | return 0; | |
248 | } | |
249 | ||
2c500a4d | 250 | int rtnl_open(struct rtnl_handle *rth, unsigned int subscriptions) |
c7699875 | 251 | { |
252 | return rtnl_open_byproto(rth, subscriptions, NETLINK_ROUTE); | |
253 | } | |
254 | ||
88470978 DA |
255 | int rtnl_addrdump_req(struct rtnl_handle *rth, int family, |
256 | req_filter_fn_t filter_fn) | |
46917d08 DA |
257 | { |
258 | struct { | |
259 | struct nlmsghdr nlh; | |
260 | struct ifaddrmsg ifm; | |
88470978 | 261 | char buf[128]; |
46917d08 | 262 | } req = { |
92e03242 | 263 | .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg)), |
46917d08 DA |
264 | .nlh.nlmsg_type = RTM_GETADDR, |
265 | .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, | |
266 | .nlh.nlmsg_seq = rth->dump = ++rth->seq, | |
267 | .ifm.ifa_family = family, | |
268 | }; | |
269 | ||
88470978 DA |
270 | if (filter_fn) { |
271 | int err; | |
272 | ||
273 | err = filter_fn(&req.nlh, sizeof(req)); | |
274 | if (err) | |
275 | return err; | |
276 | } | |
277 | ||
46917d08 DA |
278 | return send(rth->fd, &req, sizeof(req), 0); |
279 | } | |
280 | ||
39360023 DA |
281 | int rtnl_addrlbldump_req(struct rtnl_handle *rth, int family) |
282 | { | |
283 | struct { | |
284 | struct nlmsghdr nlh; | |
285 | struct ifaddrlblmsg ifal; | |
286 | } req = { | |
92e03242 | 287 | .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrlblmsg)), |
39360023 DA |
288 | .nlh.nlmsg_type = RTM_GETADDRLABEL, |
289 | .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, | |
290 | .nlh.nlmsg_seq = rth->dump = ++rth->seq, | |
291 | .ifal.ifal_family = family, | |
292 | }; | |
293 | ||
294 | return send(rth->fd, &req, sizeof(req), 0); | |
295 | } | |
296 | ||
43fd93ae DA |
297 | int rtnl_routedump_req(struct rtnl_handle *rth, int family, |
298 | req_filter_fn_t filter_fn) | |
bfb27dfa DA |
299 | { |
300 | struct { | |
301 | struct nlmsghdr nlh; | |
302 | struct rtmsg rtm; | |
43fd93ae | 303 | char buf[128]; |
bfb27dfa | 304 | } req = { |
92e03242 | 305 | .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)), |
bfb27dfa DA |
306 | .nlh.nlmsg_type = RTM_GETROUTE, |
307 | .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, | |
308 | .nlh.nlmsg_seq = rth->dump = ++rth->seq, | |
309 | .rtm.rtm_family = family, | |
310 | }; | |
311 | ||
43fd93ae DA |
312 | if (filter_fn) { |
313 | int err; | |
314 | ||
315 | err = filter_fn(&req.nlh, sizeof(req)); | |
316 | if (err) | |
317 | return err; | |
318 | } | |
319 | ||
bfb27dfa DA |
320 | return send(rth->fd, &req, sizeof(req), 0); |
321 | } | |
322 | ||
b05d9a3d DA |
323 | int rtnl_ruledump_req(struct rtnl_handle *rth, int family) |
324 | { | |
325 | struct { | |
326 | struct nlmsghdr nlh; | |
327 | struct fib_rule_hdr frh; | |
328 | } req = { | |
92e03242 | 329 | .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)), |
b05d9a3d DA |
330 | .nlh.nlmsg_type = RTM_GETRULE, |
331 | .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, | |
332 | .nlh.nlmsg_seq = rth->dump = ++rth->seq, | |
333 | .frh.family = family | |
334 | }; | |
335 | ||
336 | return send(rth->fd, &req, sizeof(req), 0); | |
337 | } | |
338 | ||
f255ab12 DA |
339 | int rtnl_neighdump_req(struct rtnl_handle *rth, int family, |
340 | req_filter_fn_t filter_fn) | |
9e0ab19c DA |
341 | { |
342 | struct { | |
343 | struct nlmsghdr nlh; | |
344 | struct ndmsg ndm; | |
f255ab12 | 345 | char buf[256]; |
9e0ab19c | 346 | } req = { |
92e03242 | 347 | .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg)), |
9e0ab19c DA |
348 | .nlh.nlmsg_type = RTM_GETNEIGH, |
349 | .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, | |
350 | .nlh.nlmsg_seq = rth->dump = ++rth->seq, | |
351 | .ndm.ndm_family = family, | |
352 | }; | |
353 | ||
f255ab12 DA |
354 | if (filter_fn) { |
355 | int err; | |
356 | ||
357 | err = filter_fn(&req.nlh, sizeof(req)); | |
358 | if (err) | |
359 | return err; | |
360 | } | |
361 | ||
9e0ab19c DA |
362 | return send(rth->fd, &req, sizeof(req), 0); |
363 | } | |
364 | ||
ff41db8a DA |
365 | int rtnl_neightbldump_req(struct rtnl_handle *rth, int family) |
366 | { | |
367 | struct { | |
368 | struct nlmsghdr nlh; | |
369 | struct ndtmsg ndtmsg; | |
370 | } req = { | |
92e03242 | 371 | .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndtmsg)), |
ff41db8a DA |
372 | .nlh.nlmsg_type = RTM_GETNEIGHTBL, |
373 | .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, | |
374 | .nlh.nlmsg_seq = rth->dump = ++rth->seq, | |
375 | .ndtmsg.ndtm_family = family, | |
376 | }; | |
377 | ||
378 | return send(rth->fd, &req, sizeof(req), 0); | |
379 | } | |
380 | ||
9dbe6df4 DA |
381 | int rtnl_mdbdump_req(struct rtnl_handle *rth, int family) |
382 | { | |
383 | struct { | |
384 | struct nlmsghdr nlh; | |
385 | struct br_port_msg bpm; | |
386 | } req = { | |
92e03242 | 387 | .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct br_port_msg)), |
9dbe6df4 DA |
388 | .nlh.nlmsg_type = RTM_GETMDB, |
389 | .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, | |
390 | .nlh.nlmsg_seq = rth->dump = ++rth->seq, | |
391 | .bpm.family = family, | |
392 | }; | |
393 | ||
394 | return send(rth->fd, &req, sizeof(req), 0); | |
395 | } | |
396 | ||
ddee16bc DA |
397 | int rtnl_netconfdump_req(struct rtnl_handle *rth, int family) |
398 | { | |
399 | struct { | |
400 | struct nlmsghdr nlh; | |
401 | struct netconfmsg ncm; | |
92e03242 | 402 | char buf[0] __aligned(NLMSG_ALIGNTO); |
ddee16bc | 403 | } req = { |
92e03242 | 404 | .nlh.nlmsg_len = NLMSG_LENGTH(NLMSG_ALIGN(sizeof(struct netconfmsg))), |
ddee16bc DA |
405 | .nlh.nlmsg_type = RTM_GETNETCONF, |
406 | .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, | |
407 | .nlh.nlmsg_seq = rth->dump = ++rth->seq, | |
408 | .ncm.ncm_family = family, | |
409 | }; | |
410 | ||
411 | return send(rth->fd, &req, sizeof(req), 0); | |
412 | } | |
413 | ||
efb0b383 DA |
414 | int rtnl_nsiddump_req(struct rtnl_handle *rth, int family) |
415 | { | |
416 | struct { | |
417 | struct nlmsghdr nlh; | |
418 | struct rtgenmsg rtm; | |
92e03242 | 419 | char buf[0] __aligned(NLMSG_ALIGNTO); |
efb0b383 | 420 | } req = { |
92e03242 | 421 | .nlh.nlmsg_len = NLMSG_LENGTH(NLMSG_ALIGN(sizeof(struct rtgenmsg))), |
efb0b383 DA |
422 | .nlh.nlmsg_type = RTM_GETNSID, |
423 | .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, | |
424 | .nlh.nlmsg_seq = rth->dump = ++rth->seq, | |
425 | .rtm.rtgen_family = family, | |
426 | }; | |
427 | ||
428 | return send(rth->fd, &req, sizeof(req), 0); | |
429 | } | |
430 | ||
d97b16b2 | 431 | static int __rtnl_linkdump_req(struct rtnl_handle *rth, int family) |
aba5acdf SH |
432 | { |
433 | struct { | |
434 | struct nlmsghdr nlh; | |
63338dca | 435 | struct ifinfomsg ifm; |
d17b136f | 436 | } req = { |
d97b16b2 | 437 | .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)), |
31ae2912 | 438 | .nlh.nlmsg_type = RTM_GETLINK, |
d17b136f PS |
439 | .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, |
440 | .nlh.nlmsg_seq = rth->dump = ++rth->seq, | |
441 | .ifm.ifi_family = family, | |
d17b136f | 442 | }; |
bd886ebb | 443 | |
2c500a4d | 444 | return send(rth->fd, &req, sizeof(req), 0); |
aba5acdf SH |
445 | } |
446 | ||
d97b16b2 | 447 | int rtnl_linkdump_req(struct rtnl_handle *rth, int family) |
b0a4ce62 | 448 | { |
d97b16b2 DA |
449 | if (family == AF_UNSPEC) |
450 | return rtnl_linkdump_req_filter(rth, family, RTEXT_FILTER_VF); | |
451 | ||
452 | return __rtnl_linkdump_req(rth, family); | |
453 | } | |
454 | ||
455 | int rtnl_linkdump_req_filter(struct rtnl_handle *rth, int family, | |
456 | __u32 filt_mask) | |
457 | { | |
97b44d57 | 458 | if (family == AF_UNSPEC || family == AF_BRIDGE) { |
d97b16b2 DA |
459 | struct { |
460 | struct nlmsghdr nlh; | |
461 | struct ifinfomsg ifm; | |
462 | /* attribute has to be NLMSG aligned */ | |
463 | struct rtattr ext_req __aligned(NLMSG_ALIGNTO); | |
464 | __u32 ext_filter_mask; | |
465 | } req = { | |
466 | .nlh.nlmsg_len = sizeof(req), | |
467 | .nlh.nlmsg_type = RTM_GETLINK, | |
468 | .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, | |
469 | .nlh.nlmsg_seq = rth->dump = ++rth->seq, | |
470 | .ifm.ifi_family = family, | |
471 | .ext_req.rta_type = IFLA_EXT_MASK, | |
472 | .ext_req.rta_len = RTA_LENGTH(sizeof(__u32)), | |
473 | .ext_filter_mask = filt_mask, | |
474 | }; | |
475 | ||
476 | return send(rth->fd, &req, sizeof(req), 0); | |
477 | } | |
b0a4ce62 | 478 | |
d97b16b2 DA |
479 | return __rtnl_linkdump_req(rth, family); |
480 | } | |
b0a4ce62 | 481 | |
d97b16b2 DA |
482 | int rtnl_linkdump_req_filter_fn(struct rtnl_handle *rth, int family, |
483 | req_filter_fn_t filter_fn) | |
484 | { | |
17ed56fd | 485 | if (family == AF_UNSPEC || family == AF_PACKET) { |
d97b16b2 DA |
486 | struct { |
487 | struct nlmsghdr nlh; | |
488 | struct ifinfomsg ifm; | |
489 | char buf[1024]; | |
490 | } req = { | |
491 | .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)), | |
492 | .nlh.nlmsg_type = RTM_GETLINK, | |
493 | .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, | |
494 | .nlh.nlmsg_seq = rth->dump = ++rth->seq, | |
495 | .ifm.ifi_family = family, | |
496 | }; | |
497 | int err; | |
498 | ||
499 | if (!filter_fn) | |
500 | return -EINVAL; | |
501 | ||
502 | err = filter_fn(&req.nlh, sizeof(req)); | |
503 | if (err) | |
504 | return err; | |
505 | ||
506 | return send(rth->fd, &req, req.nlh.nlmsg_len, 0); | |
507 | } | |
b0a4ce62 | 508 | |
d97b16b2 | 509 | return __rtnl_linkdump_req(rth, family); |
b0a4ce62 DA |
510 | } |
511 | ||
264be1d8 IS |
512 | int rtnl_fdb_linkdump_req_filter_fn(struct rtnl_handle *rth, |
513 | req_filter_fn_t filter_fn) | |
514 | { | |
515 | struct { | |
516 | struct nlmsghdr nlh; | |
517 | struct ifinfomsg ifm; | |
518 | char buf[128]; | |
519 | } req = { | |
520 | .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)), | |
521 | .nlh.nlmsg_type = RTM_GETNEIGH, | |
522 | .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, | |
523 | .nlh.nlmsg_seq = rth->dump = ++rth->seq, | |
524 | .ifm.ifi_family = PF_BRIDGE, | |
525 | }; | |
526 | int err; | |
527 | ||
528 | err = filter_fn(&req.nlh, sizeof(req)); | |
529 | if (err) | |
530 | return err; | |
531 | ||
532 | return send(rth->fd, &req, sizeof(req), 0); | |
533 | } | |
534 | ||
56eeeda9 | 535 | int rtnl_statsdump_req_filter(struct rtnl_handle *rth, int fam, __u32 filt_mask) |
7abf5de6 NA |
536 | { |
537 | struct { | |
538 | struct nlmsghdr nlh; | |
539 | struct if_stats_msg ifsm; | |
540 | } req; | |
541 | ||
542 | memset(&req, 0, sizeof(req)); | |
543 | req.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct if_stats_msg)); | |
56eeeda9 | 544 | req.nlh.nlmsg_type = RTM_GETSTATS; |
7abf5de6 NA |
545 | req.nlh.nlmsg_flags = NLM_F_DUMP|NLM_F_REQUEST; |
546 | req.nlh.nlmsg_pid = 0; | |
547 | req.nlh.nlmsg_seq = rth->dump = ++rth->seq; | |
548 | req.ifsm.family = fam; | |
549 | req.ifsm.filter_mask = filt_mask; | |
550 | ||
2c500a4d | 551 | return send(rth->fd, &req, sizeof(req), 0); |
7abf5de6 NA |
552 | } |
553 | ||
6cf8398f | 554 | int rtnl_send(struct rtnl_handle *rth, const void *buf, int len) |
aba5acdf | 555 | { |
f31a37f7 SH |
556 | return send(rth->fd, buf, len, 0); |
557 | } | |
558 | ||
6cf8398f | 559 | int rtnl_send_check(struct rtnl_handle *rth, const void *buf, int len) |
f31a37f7 | 560 | { |
54bb35c6 SH |
561 | struct nlmsghdr *h; |
562 | int status; | |
563 | char resp[1024]; | |
aba5acdf | 564 | |
f31a37f7 | 565 | status = send(rth->fd, buf, len, 0); |
54bb35c6 SH |
566 | if (status < 0) |
567 | return status; | |
568 | ||
2d8240f8 SH |
569 | /* Check for immediate errors */ |
570 | status = recv(rth->fd, resp, sizeof(resp), MSG_DONTWAIT|MSG_PEEK); | |
54bb35c6 SH |
571 | if (status < 0) { |
572 | if (errno == EAGAIN) | |
573 | return 0; | |
574 | return -1; | |
575 | } | |
576 | ||
577 | for (h = (struct nlmsghdr *)resp; NLMSG_OK(h, status); | |
578 | h = NLMSG_NEXT(h, status)) { | |
579 | if (h->nlmsg_type == NLMSG_ERROR) { | |
2c500a4d SH |
580 | struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(h); |
581 | ||
54bb35c6 SH |
582 | if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) |
583 | fprintf(stderr, "ERROR truncated\n"); | |
e9e9365b | 584 | else |
54bb35c6 | 585 | errno = -err->error; |
24f38182 | 586 | return -1; |
54bb35c6 | 587 | } |
54bb35c6 SH |
588 | } |
589 | ||
590 | return 0; | |
aba5acdf SH |
591 | } |
592 | ||
593 | int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req, int len) | |
594 | { | |
d17b136f PS |
595 | struct nlmsghdr nlh = { |
596 | .nlmsg_len = NLMSG_LENGTH(len), | |
597 | .nlmsg_type = type, | |
598 | .nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, | |
599 | .nlmsg_seq = rth->dump = ++rth->seq, | |
600 | }; | |
6cf8398f | 601 | struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK }; |
8ed63ab1 SH |
602 | struct iovec iov[2] = { |
603 | { .iov_base = &nlh, .iov_len = sizeof(nlh) }, | |
604 | { .iov_base = req, .iov_len = len } | |
605 | }; | |
aba5acdf | 606 | struct msghdr msg = { |
8ed63ab1 | 607 | .msg_name = &nladdr, |
d17b136f | 608 | .msg_namelen = sizeof(nladdr), |
8ed63ab1 SH |
609 | .msg_iov = iov, |
610 | .msg_iovlen = 2, | |
aba5acdf SH |
611 | }; |
612 | ||
aba5acdf SH |
613 | return sendmsg(rth->fd, &msg, 0); |
614 | } | |
615 | ||
0d238ca2 DA |
616 | int rtnl_dump_request_n(struct rtnl_handle *rth, struct nlmsghdr *n) |
617 | { | |
618 | struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK }; | |
619 | struct iovec iov = { | |
2c500a4d | 620 | .iov_base = n, |
0d238ca2 DA |
621 | .iov_len = n->nlmsg_len |
622 | }; | |
623 | struct msghdr msg = { | |
624 | .msg_name = &nladdr, | |
625 | .msg_namelen = sizeof(nladdr), | |
626 | .msg_iov = &iov, | |
627 | .msg_iovlen = 1, | |
628 | }; | |
629 | ||
630 | n->nlmsg_flags = NLM_F_DUMP|NLM_F_REQUEST; | |
631 | n->nlmsg_pid = 0; | |
632 | n->nlmsg_seq = rth->dump = ++rth->seq; | |
633 | ||
634 | return sendmsg(rth->fd, &msg, 0); | |
635 | } | |
636 | ||
0efa6257 | 637 | static int rtnl_dump_done(struct nlmsghdr *h) |
892a25e2 SH |
638 | { |
639 | int len = *(int *)NLMSG_DATA(h); | |
640 | ||
05a14fc1 DA |
641 | if (h->nlmsg_len < NLMSG_LENGTH(sizeof(int))) { |
642 | fprintf(stderr, "DONE truncated\n"); | |
643 | return -1; | |
644 | } | |
892a25e2 | 645 | |
05a14fc1 | 646 | if (len < 0) { |
2750252d DA |
647 | /* check for any messages returned from kernel */ |
648 | if (nl_dump_ext_ack_done(h, len)) | |
649 | return len; | |
650 | ||
05a14fc1 DA |
651 | errno = -len; |
652 | switch (errno) { | |
653 | case ENOENT: | |
654 | case EOPNOTSUPP: | |
655 | return -1; | |
656 | case EMSGSIZE: | |
657 | fprintf(stderr, | |
658 | "Error: Buffer too small for object.\n"); | |
659 | break; | |
660 | default: | |
892a25e2 | 661 | perror("RTNETLINK answers"); |
892a25e2 | 662 | } |
05a14fc1 | 663 | return len; |
892a25e2 | 664 | } |
05a14fc1 | 665 | |
844c37b4 DA |
666 | /* check for any messages returned from kernel */ |
667 | nl_dump_ext_ack(h, NULL); | |
668 | ||
892a25e2 SH |
669 | return 0; |
670 | } | |
671 | ||
672 | static void rtnl_dump_error(const struct rtnl_handle *rth, | |
673 | struct nlmsghdr *h) | |
674 | { | |
675 | ||
676 | if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) { | |
677 | fprintf(stderr, "ERROR truncated\n"); | |
678 | } else { | |
679 | const struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(h); | |
680 | ||
681 | errno = -err->error; | |
682 | if (rth->proto == NETLINK_SOCK_DIAG && | |
683 | (errno == ENOENT || | |
684 | errno == EOPNOTSUPP)) | |
685 | return; | |
686 | ||
3ad6d176 DA |
687 | if (!(rth->flags & RTNL_HANDLE_F_SUPPRESS_NLERR)) |
688 | perror("RTNETLINK answers"); | |
892a25e2 SH |
689 | } |
690 | } | |
691 | ||
2d34851c HL |
692 | static int __rtnl_recvmsg(int fd, struct msghdr *msg, int flags) |
693 | { | |
694 | int len; | |
695 | ||
696 | do { | |
697 | len = recvmsg(fd, msg, flags); | |
698 | } while (len < 0 && (errno == EINTR || errno == EAGAIN)); | |
699 | ||
700 | if (len < 0) { | |
701 | fprintf(stderr, "netlink receive error %s (%d)\n", | |
702 | strerror(errno), errno); | |
703 | return -errno; | |
704 | } | |
705 | ||
706 | if (len == 0) { | |
707 | fprintf(stderr, "EOF on netlink\n"); | |
708 | return -ENODATA; | |
709 | } | |
710 | ||
711 | return len; | |
712 | } | |
713 | ||
714 | static int rtnl_recvmsg(int fd, struct msghdr *msg, char **answer) | |
715 | { | |
716 | struct iovec *iov = msg->msg_iov; | |
717 | char *buf; | |
718 | int len; | |
719 | ||
720 | iov->iov_base = NULL; | |
721 | iov->iov_len = 0; | |
722 | ||
723 | len = __rtnl_recvmsg(fd, msg, MSG_PEEK | MSG_TRUNC); | |
724 | if (len < 0) | |
725 | return len; | |
726 | ||
bb5ae621 ED |
727 | if (len < 32768) |
728 | len = 32768; | |
2d34851c HL |
729 | buf = malloc(len); |
730 | if (!buf) { | |
731 | fprintf(stderr, "malloc error: not enough buffer\n"); | |
732 | return -ENOMEM; | |
733 | } | |
734 | ||
735 | iov->iov_base = buf; | |
736 | iov->iov_len = len; | |
737 | ||
738 | len = __rtnl_recvmsg(fd, msg, 0); | |
739 | if (len < 0) { | |
740 | free(buf); | |
741 | return len; | |
742 | } | |
743 | ||
744 | if (answer) | |
745 | *answer = buf; | |
746 | else | |
747 | free(buf); | |
748 | ||
749 | return len; | |
750 | } | |
751 | ||
1d2fac41 SH |
752 | static int rtnl_dump_filter_l(struct rtnl_handle *rth, |
753 | const struct rtnl_dump_filter_arg *arg) | |
aba5acdf | 754 | { |
aba5acdf | 755 | struct sockaddr_nl nladdr; |
8ed63ab1 SH |
756 | struct iovec iov; |
757 | struct msghdr msg = { | |
758 | .msg_name = &nladdr, | |
759 | .msg_namelen = sizeof(nladdr), | |
760 | .msg_iov = &iov, | |
761 | .msg_iovlen = 1, | |
762 | }; | |
2d34851c | 763 | char *buf; |
16f02e14 | 764 | int dump_intr = 0; |
aba5acdf SH |
765 | |
766 | while (1) { | |
767 | int status; | |
b49240ec | 768 | const struct rtnl_dump_filter_arg *a; |
3bc1c4f2 BG |
769 | int found_done = 0; |
770 | int msglen = 0; | |
aba5acdf | 771 | |
2d34851c HL |
772 | status = rtnl_recvmsg(rth->fd, &msg, &buf); |
773 | if (status < 0) | |
774 | return status; | |
aba5acdf | 775 | |
486ccd99 VK |
776 | if (rth->dump_fp) |
777 | fwrite(buf, 1, NLMSG_ALIGN(status), rth->dump_fp); | |
778 | ||
b49240ec | 779 | for (a = arg; a->filter; a++) { |
2c500a4d SH |
780 | struct nlmsghdr *h = (struct nlmsghdr *)buf; |
781 | ||
3bc1c4f2 | 782 | msglen = status; |
b49240ec | 783 | |
3bc1c4f2 | 784 | while (NLMSG_OK(h, msglen)) { |
486ccd99 | 785 | int err = 0; |
b49240ec | 786 | |
8e72880f PS |
787 | h->nlmsg_flags &= ~a->nc_flags; |
788 | ||
b49240ec SH |
789 | if (nladdr.nl_pid != 0 || |
790 | h->nlmsg_pid != rth->local.nl_pid || | |
cd70f3f5 | 791 | h->nlmsg_seq != rth->dump) |
b49240ec | 792 | goto skip_it; |
aba5acdf | 793 | |
16f02e14 ND |
794 | if (h->nlmsg_flags & NLM_F_DUMP_INTR) |
795 | dump_intr = 1; | |
796 | ||
3bc1c4f2 | 797 | if (h->nlmsg_type == NLMSG_DONE) { |
0efa6257 | 798 | err = rtnl_dump_done(h); |
2d34851c HL |
799 | if (err < 0) { |
800 | free(buf); | |
892a25e2 | 801 | return -1; |
2d34851c | 802 | } |
892a25e2 | 803 | |
3bc1c4f2 BG |
804 | found_done = 1; |
805 | break; /* process next filter */ | |
806 | } | |
892a25e2 | 807 | |
b49240ec | 808 | if (h->nlmsg_type == NLMSG_ERROR) { |
892a25e2 | 809 | rtnl_dump_error(rth, h); |
2d34851c | 810 | free(buf); |
b49240ec | 811 | return -1; |
aba5acdf | 812 | } |
486ccd99 VK |
813 | |
814 | if (!rth->dump_fp) { | |
cd554f2c | 815 | err = a->filter(h, a->arg1); |
2d34851c HL |
816 | if (err < 0) { |
817 | free(buf); | |
486ccd99 | 818 | return err; |
2d34851c | 819 | } |
486ccd99 | 820 | } |
aba5acdf SH |
821 | |
822 | skip_it: | |
3bc1c4f2 | 823 | h = NLMSG_NEXT(h, msglen); |
b49240ec | 824 | } |
3bc1c4f2 | 825 | } |
2d34851c | 826 | free(buf); |
3bc1c4f2 | 827 | |
16f02e14 ND |
828 | if (found_done) { |
829 | if (dump_intr) | |
830 | fprintf(stderr, | |
831 | "Dump was interrupted and may be inconsistent.\n"); | |
3bc1c4f2 | 832 | return 0; |
16f02e14 | 833 | } |
3bc1c4f2 | 834 | |
aba5acdf SH |
835 | if (msg.msg_flags & MSG_TRUNC) { |
836 | fprintf(stderr, "Message truncated\n"); | |
837 | continue; | |
838 | } | |
3bc1c4f2 BG |
839 | if (msglen) { |
840 | fprintf(stderr, "!!!Remnant of size %d\n", msglen); | |
aba5acdf SH |
841 | exit(1); |
842 | } | |
843 | } | |
844 | } | |
845 | ||
8e72880f | 846 | int rtnl_dump_filter_nc(struct rtnl_handle *rth, |
b49240ec | 847 | rtnl_filter_t filter, |
8e72880f | 848 | void *arg1, __u16 nc_flags) |
b49240ec SH |
849 | { |
850 | const struct rtnl_dump_filter_arg a[2] = { | |
8e72880f PS |
851 | { .filter = filter, .arg1 = arg1, .nc_flags = nc_flags, }, |
852 | { .filter = NULL, .arg1 = NULL, .nc_flags = 0, }, | |
b49240ec SH |
853 | }; |
854 | ||
855 | return rtnl_dump_filter_l(rth, a); | |
856 | } | |
857 | ||
b6432e68 SH |
858 | static void rtnl_talk_error(struct nlmsghdr *h, struct nlmsgerr *err, |
859 | nl_ext_ack_fn_t errfn) | |
860 | { | |
844c37b4 | 861 | if (nl_dump_ext_ack(h, errfn)) |
b6432e68 SH |
862 | return; |
863 | ||
864 | fprintf(stderr, "RTNETLINK answers: %s\n", | |
865 | strerror(-err->error)); | |
866 | } | |
867 | ||
72a2ff39 CM |
868 | |
869 | static int __rtnl_talk_iov(struct rtnl_handle *rtnl, struct iovec *iov, | |
870 | size_t iovlen, struct nlmsghdr **answer, | |
871 | bool show_rtnl_err, nl_ext_ack_fn_t errfn) | |
aba5acdf | 872 | { |
d17b136f | 873 | struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK }; |
72a2ff39 | 874 | struct iovec riov; |
aba5acdf | 875 | struct msghdr msg = { |
8ed63ab1 SH |
876 | .msg_name = &nladdr, |
877 | .msg_namelen = sizeof(nladdr), | |
72a2ff39 CM |
878 | .msg_iov = iov, |
879 | .msg_iovlen = iovlen, | |
aba5acdf | 880 | }; |
72a2ff39 CM |
881 | unsigned int seq = 0; |
882 | struct nlmsghdr *h; | |
883 | int i, status; | |
2d34851c | 884 | char *buf; |
aba5acdf | 885 | |
72a2ff39 CM |
886 | for (i = 0; i < iovlen; i++) { |
887 | h = iov[i].iov_base; | |
888 | h->nlmsg_seq = seq = ++rtnl->seq; | |
889 | if (answer == NULL) | |
890 | h->nlmsg_flags |= NLM_F_ACK; | |
891 | } | |
aba5acdf SH |
892 | |
893 | status = sendmsg(rtnl->fd, &msg, 0); | |
aba5acdf SH |
894 | if (status < 0) { |
895 | perror("Cannot talk to rtnetlink"); | |
896 | return -1; | |
897 | } | |
898 | ||
72a2ff39 CM |
899 | /* change msg to use the response iov */ |
900 | msg.msg_iov = &riov; | |
901 | msg.msg_iovlen = 1; | |
902 | i = 0; | |
aba5acdf | 903 | while (1) { |
0951cbcd | 904 | next: |
2d34851c | 905 | status = rtnl_recvmsg(rtnl->fd, &msg, &buf); |
72a2ff39 | 906 | ++i; |
2d34851c HL |
907 | |
908 | if (status < 0) | |
909 | return status; | |
aba5acdf | 910 | |
aba5acdf | 911 | if (msg.msg_namelen != sizeof(nladdr)) { |
2c500a4d SH |
912 | fprintf(stderr, |
913 | "sender address length == %d\n", | |
914 | msg.msg_namelen); | |
aba5acdf SH |
915 | exit(1); |
916 | } | |
2c500a4d | 917 | for (h = (struct nlmsghdr *)buf; status >= sizeof(*h); ) { |
aba5acdf SH |
918 | int len = h->nlmsg_len; |
919 | int l = len - sizeof(*h); | |
920 | ||
2c500a4d | 921 | if (l < 0 || len > status) { |
aba5acdf SH |
922 | if (msg.msg_flags & MSG_TRUNC) { |
923 | fprintf(stderr, "Truncated message\n"); | |
2d34851c | 924 | free(buf); |
aba5acdf SH |
925 | return -1; |
926 | } | |
2c500a4d SH |
927 | fprintf(stderr, |
928 | "!!!malformed message: len=%d\n", | |
929 | len); | |
aba5acdf SH |
930 | exit(1); |
931 | } | |
932 | ||
c079e121 | 933 | if (nladdr.nl_pid != 0 || |
10f57ef1 | 934 | h->nlmsg_pid != rtnl->local.nl_pid || |
72a2ff39 | 935 | h->nlmsg_seq > seq || h->nlmsg_seq < seq - iovlen) { |
4cca16f2 SH |
936 | /* Don't forget to skip that message. */ |
937 | status -= NLMSG_ALIGN(len); | |
2c500a4d | 938 | h = (struct nlmsghdr *)((char *)h + NLMSG_ALIGN(len)); |
aba5acdf SH |
939 | continue; |
940 | } | |
941 | ||
942 | if (h->nlmsg_type == NLMSG_ERROR) { | |
2c500a4d | 943 | struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(h); |
8c50b728 | 944 | int error = err->error; |
2c500a4d | 945 | |
aba5acdf SH |
946 | if (l < sizeof(struct nlmsgerr)) { |
947 | fprintf(stderr, "ERROR truncated\n"); | |
c60389e4 SH |
948 | free(buf); |
949 | return -1; | |
950 | } | |
951 | ||
bfb3bf18 | 952 | if (!error) { |
844c37b4 DA |
953 | /* check messages from kernel */ |
954 | nl_dump_ext_ack(h, errfn); | |
bfb3bf18 SH |
955 | } else { |
956 | errno = -error; | |
844c37b4 | 957 | |
b45e3000 SH |
958 | if (rtnl->proto != NETLINK_SOCK_DIAG && |
959 | show_rtnl_err) | |
960 | rtnl_talk_error(h, err, errfn); | |
961 | } | |
b6432e68 | 962 | |
c60389e4 SH |
963 | if (answer) |
964 | *answer = (struct nlmsghdr *)buf; | |
965 | else | |
966 | free(buf); | |
b45e3000 | 967 | |
0951cbcd PM |
968 | if (i < iovlen) |
969 | goto next; | |
8c50b728 | 970 | return error ? -i : 0; |
aba5acdf | 971 | } |
c079e121 | 972 | |
aba5acdf | 973 | if (answer) { |
86bf43c7 | 974 | *answer = (struct nlmsghdr *)buf; |
aba5acdf SH |
975 | return 0; |
976 | } | |
977 | ||
978 | fprintf(stderr, "Unexpected reply!!!\n"); | |
979 | ||
980 | status -= NLMSG_ALIGN(len); | |
2c500a4d | 981 | h = (struct nlmsghdr *)((char *)h + NLMSG_ALIGN(len)); |
aba5acdf | 982 | } |
2d34851c | 983 | free(buf); |
c079e121 | 984 | |
aba5acdf SH |
985 | if (msg.msg_flags & MSG_TRUNC) { |
986 | fprintf(stderr, "Message truncated\n"); | |
987 | continue; | |
988 | } | |
c079e121 | 989 | |
aba5acdf SH |
990 | if (status) { |
991 | fprintf(stderr, "!!!Remnant of size %d\n", status); | |
992 | exit(1); | |
993 | } | |
994 | } | |
995 | } | |
996 | ||
72a2ff39 CM |
997 | static int __rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, |
998 | struct nlmsghdr **answer, | |
999 | bool show_rtnl_err, nl_ext_ack_fn_t errfn) | |
1000 | { | |
1001 | struct iovec iov = { | |
1002 | .iov_base = n, | |
1003 | .iov_len = n->nlmsg_len | |
1004 | }; | |
1005 | ||
1006 | return __rtnl_talk_iov(rtnl, &iov, 1, answer, show_rtnl_err, errfn); | |
1007 | } | |
1008 | ||
463d9efa | 1009 | int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, |
86bf43c7 | 1010 | struct nlmsghdr **answer) |
463d9efa | 1011 | { |
86bf43c7 | 1012 | return __rtnl_talk(rtnl, n, answer, true, NULL); |
b6432e68 SH |
1013 | } |
1014 | ||
72a2ff39 CM |
1015 | int rtnl_talk_iov(struct rtnl_handle *rtnl, struct iovec *iovec, size_t iovlen, |
1016 | struct nlmsghdr **answer) | |
1017 | { | |
1018 | return __rtnl_talk_iov(rtnl, iovec, iovlen, answer, true, NULL); | |
1019 | } | |
1020 | ||
463d9efa | 1021 | int rtnl_talk_suppress_rtnl_errmsg(struct rtnl_handle *rtnl, struct nlmsghdr *n, |
86bf43c7 | 1022 | struct nlmsghdr **answer) |
463d9efa | 1023 | { |
86bf43c7 | 1024 | return __rtnl_talk(rtnl, n, answer, false, NULL); |
463d9efa DA |
1025 | } |
1026 | ||
449b824a ND |
1027 | int rtnl_listen_all_nsid(struct rtnl_handle *rth) |
1028 | { | |
1029 | unsigned int on = 1; | |
1030 | ||
1031 | if (setsockopt(rth->fd, SOL_NETLINK, NETLINK_LISTEN_ALL_NSID, &on, | |
1032 | sizeof(on)) < 0) { | |
1033 | perror("NETLINK_LISTEN_ALL_NSID"); | |
1034 | return -1; | |
1035 | } | |
1036 | rth->flags |= RTNL_HANDLE_F_LISTEN_ALL_NSID; | |
1037 | return 0; | |
1038 | } | |
1039 | ||
8ed63ab1 | 1040 | int rtnl_listen(struct rtnl_handle *rtnl, |
0628cddd | 1041 | rtnl_listen_filter_t handler, |
6dc9f016 | 1042 | void *jarg) |
aba5acdf SH |
1043 | { |
1044 | int status; | |
1045 | struct nlmsghdr *h; | |
d17b136f | 1046 | struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK }; |
aba5acdf | 1047 | struct iovec iov; |
aba5acdf | 1048 | struct msghdr msg = { |
8ed63ab1 SH |
1049 | .msg_name = &nladdr, |
1050 | .msg_namelen = sizeof(nladdr), | |
1051 | .msg_iov = &iov, | |
1052 | .msg_iovlen = 1, | |
aba5acdf | 1053 | }; |
e557212e | 1054 | char buf[16384]; |
449b824a ND |
1055 | char cmsgbuf[BUFSIZ]; |
1056 | ||
1057 | if (rtnl->flags & RTNL_HANDLE_F_LISTEN_ALL_NSID) { | |
1058 | msg.msg_control = &cmsgbuf; | |
1059 | msg.msg_controllen = sizeof(cmsgbuf); | |
1060 | } | |
aba5acdf | 1061 | |
aba5acdf | 1062 | iov.iov_base = buf; |
aba5acdf | 1063 | while (1) { |
449b824a ND |
1064 | struct rtnl_ctrl_data ctrl; |
1065 | struct cmsghdr *cmsg; | |
1066 | ||
aba5acdf SH |
1067 | iov.iov_len = sizeof(buf); |
1068 | status = recvmsg(rtnl->fd, &msg, 0); | |
1069 | ||
1070 | if (status < 0) { | |
aa8032e6 | 1071 | if (errno == EINTR || errno == EAGAIN) |
aba5acdf | 1072 | continue; |
aa8032e6 SH |
1073 | fprintf(stderr, "netlink receive error %s (%d)\n", |
1074 | strerror(errno), errno); | |
7f03191f PM |
1075 | if (errno == ENOBUFS) |
1076 | continue; | |
aa8032e6 | 1077 | return -1; |
aba5acdf SH |
1078 | } |
1079 | if (status == 0) { | |
1080 | fprintf(stderr, "EOF on netlink\n"); | |
1081 | return -1; | |
1082 | } | |
1083 | if (msg.msg_namelen != sizeof(nladdr)) { | |
2c500a4d SH |
1084 | fprintf(stderr, |
1085 | "Sender address length == %d\n", | |
1086 | msg.msg_namelen); | |
aba5acdf SH |
1087 | exit(1); |
1088 | } | |
449b824a ND |
1089 | |
1090 | if (rtnl->flags & RTNL_HANDLE_F_LISTEN_ALL_NSID) { | |
1091 | memset(&ctrl, 0, sizeof(ctrl)); | |
1092 | ctrl.nsid = -1; | |
1093 | for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; | |
1094 | cmsg = CMSG_NXTHDR(&msg, cmsg)) | |
1095 | if (cmsg->cmsg_level == SOL_NETLINK && | |
1096 | cmsg->cmsg_type == NETLINK_LISTEN_ALL_NSID && | |
1097 | cmsg->cmsg_len == CMSG_LEN(sizeof(int))) { | |
1098 | int *data = (int *)CMSG_DATA(cmsg); | |
1099 | ||
1100 | ctrl.nsid = *data; | |
1101 | } | |
1102 | } | |
1103 | ||
2c500a4d | 1104 | for (h = (struct nlmsghdr *)buf; status >= sizeof(*h); ) { |
aba5acdf SH |
1105 | int err; |
1106 | int len = h->nlmsg_len; | |
1107 | int l = len - sizeof(*h); | |
1108 | ||
2c500a4d | 1109 | if (l < 0 || len > status) { |
aba5acdf SH |
1110 | if (msg.msg_flags & MSG_TRUNC) { |
1111 | fprintf(stderr, "Truncated message\n"); | |
1112 | return -1; | |
1113 | } | |
2c500a4d SH |
1114 | fprintf(stderr, |
1115 | "!!!malformed message: len=%d\n", | |
1116 | len); | |
aba5acdf SH |
1117 | exit(1); |
1118 | } | |
1119 | ||
cd554f2c | 1120 | err = handler(&ctrl, h, jarg); |
aba5acdf SH |
1121 | if (err < 0) |
1122 | return err; | |
1123 | ||
1124 | status -= NLMSG_ALIGN(len); | |
2c500a4d | 1125 | h = (struct nlmsghdr *)((char *)h + NLMSG_ALIGN(len)); |
aba5acdf SH |
1126 | } |
1127 | if (msg.msg_flags & MSG_TRUNC) { | |
1128 | fprintf(stderr, "Message truncated\n"); | |
1129 | continue; | |
1130 | } | |
1131 | if (status) { | |
1132 | fprintf(stderr, "!!!Remnant of size %d\n", status); | |
1133 | exit(1); | |
1134 | } | |
1135 | } | |
1136 | } | |
1137 | ||
0628cddd | 1138 | int rtnl_from_file(FILE *rtnl, rtnl_listen_filter_t handler, |
6dc9f016 | 1139 | void *jarg) |
aba5acdf SH |
1140 | { |
1141 | int status; | |
2c500a4d SH |
1142 | char buf[16384]; |
1143 | struct nlmsghdr *h = (struct nlmsghdr *)buf; | |
aba5acdf | 1144 | |
aba5acdf | 1145 | while (1) { |
2dd9f8e0 | 1146 | int err, len; |
aba5acdf SH |
1147 | int l; |
1148 | ||
1149 | status = fread(&buf, 1, sizeof(*h), rtnl); | |
1150 | ||
1151 | if (status < 0) { | |
1152 | if (errno == EINTR) | |
1153 | continue; | |
1154 | perror("rtnl_from_file: fread"); | |
1155 | return -1; | |
1156 | } | |
1157 | if (status == 0) | |
1158 | return 0; | |
1159 | ||
1160 | len = h->nlmsg_len; | |
aba5acdf SH |
1161 | l = len - sizeof(*h); |
1162 | ||
2c500a4d | 1163 | if (l < 0 || len > sizeof(buf)) { |
aba5acdf SH |
1164 | fprintf(stderr, "!!!malformed message: len=%d @%lu\n", |
1165 | len, ftell(rtnl)); | |
1166 | return -1; | |
1167 | } | |
1168 | ||
1169 | status = fread(NLMSG_DATA(h), 1, NLMSG_ALIGN(l), rtnl); | |
1170 | ||
1171 | if (status < 0) { | |
1172 | perror("rtnl_from_file: fread"); | |
1173 | return -1; | |
1174 | } | |
1175 | if (status < l) { | |
1176 | fprintf(stderr, "rtnl-from_file: truncated message\n"); | |
1177 | return -1; | |
1178 | } | |
1179 | ||
cd554f2c | 1180 | err = handler(NULL, h, jarg); |
aba5acdf SH |
1181 | if (err < 0) |
1182 | return err; | |
1183 | } | |
1184 | } | |
1185 | ||
2aa3dd29 SH |
1186 | int addattr(struct nlmsghdr *n, int maxlen, int type) |
1187 | { | |
1188 | return addattr_l(n, maxlen, type, NULL, 0); | |
1189 | } | |
1190 | ||
1191 | int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data) | |
1192 | { | |
1193 | return addattr_l(n, maxlen, type, &data, sizeof(__u8)); | |
1194 | } | |
1195 | ||
1196 | int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data) | |
1197 | { | |
1198 | return addattr_l(n, maxlen, type, &data, sizeof(__u16)); | |
1199 | } | |
1200 | ||
aba5acdf SH |
1201 | int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data) |
1202 | { | |
2aa3dd29 SH |
1203 | return addattr_l(n, maxlen, type, &data, sizeof(__u32)); |
1204 | } | |
1205 | ||
1206 | int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data) | |
1207 | { | |
1208 | return addattr_l(n, maxlen, type, &data, sizeof(__u64)); | |
1209 | } | |
1210 | ||
1211 | int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *str) | |
1212 | { | |
1213 | return addattr_l(n, maxlen, type, str, strlen(str)+1); | |
aba5acdf SH |
1214 | } |
1215 | ||
8ed63ab1 | 1216 | int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data, |
6dc9f016 | 1217 | int alen) |
aba5acdf SH |
1218 | { |
1219 | int len = RTA_LENGTH(alen); | |
1220 | struct rtattr *rta; | |
1221 | ||
3dabdbb3 | 1222 | if (NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len) > maxlen) { |
2c500a4d SH |
1223 | fprintf(stderr, |
1224 | "addattr_l ERROR: message exceeded bound of %d\n", | |
1225 | maxlen); | |
aba5acdf | 1226 | return -1; |
007d3a3e | 1227 | } |
07f94362 | 1228 | rta = NLMSG_TAIL(n); |
aba5acdf SH |
1229 | rta->rta_type = type; |
1230 | rta->rta_len = len; | |
893deac4 PS |
1231 | if (alen) |
1232 | memcpy(RTA_DATA(rta), data, alen); | |
3dabdbb3 | 1233 | n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len); |
aba5acdf SH |
1234 | return 0; |
1235 | } | |
1236 | ||
07f94362 | 1237 | int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len) |
1238 | { | |
1239 | if (NLMSG_ALIGN(n->nlmsg_len) + NLMSG_ALIGN(len) > maxlen) { | |
2c500a4d SH |
1240 | fprintf(stderr, |
1241 | "addraw_l ERROR: message exceeded bound of %d\n", | |
1242 | maxlen); | |
07f94362 | 1243 | return -1; |
1244 | } | |
1245 | ||
1246 | memcpy(NLMSG_TAIL(n), data, len); | |
1247 | memset((void *) NLMSG_TAIL(n) + len, 0, NLMSG_ALIGN(len) - len); | |
1248 | n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + NLMSG_ALIGN(len); | |
1249 | return 0; | |
1250 | } | |
1251 | ||
2f90c9c0 PM |
1252 | struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type) |
1253 | { | |
1254 | struct rtattr *nest = NLMSG_TAIL(n); | |
1255 | ||
1256 | addattr_l(n, maxlen, type, NULL, 0); | |
1257 | return nest; | |
1258 | } | |
1259 | ||
1260 | int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest) | |
1261 | { | |
1262 | nest->rta_len = (void *)NLMSG_TAIL(n) - (void *)nest; | |
1263 | return n->nlmsg_len; | |
1264 | } | |
1265 | ||
1266 | struct rtattr *addattr_nest_compat(struct nlmsghdr *n, int maxlen, int type, | |
1267 | const void *data, int len) | |
1268 | { | |
1269 | struct rtattr *start = NLMSG_TAIL(n); | |
1270 | ||
1271 | addattr_l(n, maxlen, type, data, len); | |
1272 | addattr_nest(n, maxlen, type); | |
1273 | return start; | |
1274 | } | |
1275 | ||
1276 | int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *start) | |
1277 | { | |
1278 | struct rtattr *nest = (void *)start + NLMSG_ALIGN(start->rta_len); | |
1279 | ||
1280 | start->rta_len = (void *)NLMSG_TAIL(n) - (void *)start; | |
1281 | addattr_nest_end(n, nest); | |
1282 | return n->nlmsg_len; | |
1283 | } | |
1284 | ||
aba5acdf SH |
1285 | int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data) |
1286 | { | |
1287 | int len = RTA_LENGTH(4); | |
1288 | struct rtattr *subrta; | |
1289 | ||
007d3a3e | 1290 | if (RTA_ALIGN(rta->rta_len) + len > maxlen) { |
2c500a4d SH |
1291 | fprintf(stderr, |
1292 | "rta_addattr32: Error! max allowed bound %d exceeded\n", | |
1293 | maxlen); | |
aba5acdf | 1294 | return -1; |
007d3a3e | 1295 | } |
2c500a4d | 1296 | subrta = (struct rtattr *)(((char *)rta) + RTA_ALIGN(rta->rta_len)); |
aba5acdf SH |
1297 | subrta->rta_type = type; |
1298 | subrta->rta_len = len; | |
1299 | memcpy(RTA_DATA(subrta), &data, 4); | |
1300 | rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len; | |
1301 | return 0; | |
1302 | } | |
1303 | ||
8ed63ab1 | 1304 | int rta_addattr_l(struct rtattr *rta, int maxlen, int type, |
6dc9f016 | 1305 | const void *data, int alen) |
aba5acdf SH |
1306 | { |
1307 | struct rtattr *subrta; | |
1308 | int len = RTA_LENGTH(alen); | |
1309 | ||
3dabdbb3 | 1310 | if (RTA_ALIGN(rta->rta_len) + RTA_ALIGN(len) > maxlen) { |
2c500a4d SH |
1311 | fprintf(stderr, |
1312 | "rta_addattr_l: Error! max allowed bound %d exceeded\n", | |
1313 | maxlen); | |
aba5acdf | 1314 | return -1; |
007d3a3e | 1315 | } |
2c500a4d | 1316 | subrta = (struct rtattr *)(((char *)rta) + RTA_ALIGN(rta->rta_len)); |
aba5acdf SH |
1317 | subrta->rta_type = type; |
1318 | subrta->rta_len = len; | |
893deac4 PS |
1319 | if (alen) |
1320 | memcpy(RTA_DATA(subrta), data, alen); | |
3dabdbb3 | 1321 | rta->rta_len = NLMSG_ALIGN(rta->rta_len) + RTA_ALIGN(len); |
aba5acdf SH |
1322 | return 0; |
1323 | } | |
1324 | ||
303cc9cb RP |
1325 | int rta_addattr8(struct rtattr *rta, int maxlen, int type, __u8 data) |
1326 | { | |
1327 | return rta_addattr_l(rta, maxlen, type, &data, sizeof(__u8)); | |
1328 | } | |
1329 | ||
1330 | int rta_addattr16(struct rtattr *rta, int maxlen, int type, __u16 data) | |
1331 | { | |
1332 | return rta_addattr_l(rta, maxlen, type, &data, sizeof(__u16)); | |
1333 | } | |
1334 | ||
1335 | int rta_addattr64(struct rtattr *rta, int maxlen, int type, __u64 data) | |
1336 | { | |
1337 | return rta_addattr_l(rta, maxlen, type, &data, sizeof(__u64)); | |
1338 | } | |
1339 | ||
1340 | struct rtattr *rta_nest(struct rtattr *rta, int maxlen, int type) | |
1341 | { | |
1342 | struct rtattr *nest = RTA_TAIL(rta); | |
1343 | ||
1344 | rta_addattr_l(rta, maxlen, type, NULL, 0); | |
2360b8cb | 1345 | nest->rta_type |= NLA_F_NESTED; |
303cc9cb RP |
1346 | |
1347 | return nest; | |
1348 | } | |
1349 | ||
1350 | int rta_nest_end(struct rtattr *rta, struct rtattr *nest) | |
1351 | { | |
1352 | nest->rta_len = (void *)RTA_TAIL(rta) - (void *)nest; | |
1353 | ||
1354 | return rta->rta_len; | |
1355 | } | |
1356 | ||
aba5acdf SH |
1357 | int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len) |
1358 | { | |
b1b7ce0f VY |
1359 | return parse_rtattr_flags(tb, max, rta, len, 0); |
1360 | } | |
1361 | ||
1362 | int parse_rtattr_flags(struct rtattr *tb[], int max, struct rtattr *rta, | |
1363 | int len, unsigned short flags) | |
1364 | { | |
1365 | unsigned short type; | |
1366 | ||
175e2440 | 1367 | memset(tb, 0, sizeof(struct rtattr *) * (max + 1)); |
aba5acdf | 1368 | while (RTA_OK(rta, len)) { |
b1b7ce0f VY |
1369 | type = rta->rta_type & ~flags; |
1370 | if ((type <= max) && (!tb[type])) | |
1371 | tb[type] = rta; | |
2c500a4d | 1372 | rta = RTA_NEXT(rta, len); |
aba5acdf SH |
1373 | } |
1374 | if (len) | |
2c500a4d SH |
1375 | fprintf(stderr, "!!!Deficit %d, rta_len=%d\n", |
1376 | len, rta->rta_len); | |
aba5acdf SH |
1377 | return 0; |
1378 | } | |
c7699875 | 1379 | |
decbb437 JP |
1380 | struct rtattr *parse_rtattr_one(int type, struct rtattr *rta, int len) |
1381 | { | |
1382 | while (RTA_OK(rta, len)) { | |
1383 | if (rta->rta_type == type) | |
1384 | return rta; | |
1385 | rta = RTA_NEXT(rta, len); | |
1386 | } | |
2c500a4d | 1387 | |
decbb437 | 1388 | if (len) |
2c500a4d SH |
1389 | fprintf(stderr, "!!!Deficit %d, rta_len=%d\n", |
1390 | len, rta->rta_len); | |
decbb437 JP |
1391 | return NULL; |
1392 | } | |
1393 | ||
2c500a4d SH |
1394 | int __parse_rtattr_nested_compat(struct rtattr *tb[], int max, |
1395 | struct rtattr *rta, | |
1396 | int len) | |
2f90c9c0 PM |
1397 | { |
1398 | if (RTA_PAYLOAD(rta) < len) | |
1399 | return -1; | |
1400 | if (RTA_PAYLOAD(rta) >= RTA_ALIGN(len) + sizeof(struct rtattr)) { | |
1401 | rta = RTA_DATA(rta) + RTA_ALIGN(len); | |
1402 | return parse_rtattr_nested(tb, max, rta); | |
1403 | } | |
037c635e | 1404 | memset(tb, 0, sizeof(struct rtattr *) * (max + 1)); |
2f90c9c0 PM |
1405 | return 0; |
1406 | } |