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Commit | Line | Data |
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4d9ad5dc MS |
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 | ||
b45ac5f5 DL |
13 | #ifdef HAVE_CONFIG_H |
14 | #include "config.h" | |
15 | #endif | |
16 | ||
4d9ad5dc MS |
17 | #ifdef __linux__ |
18 | ||
19 | #include <stdio.h> | |
20 | #include <stdlib.h> | |
21 | #include <unistd.h> | |
22 | #include <syslog.h> | |
23 | #include <fcntl.h> | |
24 | #include <net/if_arp.h> | |
25 | #include <sys/socket.h> | |
26 | #include <netinet/in.h> | |
27 | #include <string.h> | |
28 | #include <errno.h> | |
29 | #include <time.h> | |
30 | #include <sys/uio.h> | |
31 | #include <assert.h> | |
32 | ||
33 | #include "mtracebis_netlink.h" | |
34 | ||
35 | int rcvbuf = 1024 * 1024; | |
36 | ||
37 | void rtnl_close(struct rtnl_handle *rth) | |
38 | { | |
39 | if (rth->fd >= 0) { | |
40 | close(rth->fd); | |
41 | rth->fd = -1; | |
42 | } | |
43 | } | |
44 | ||
45 | int rtnl_open_byproto(struct rtnl_handle *rth, unsigned subscriptions, | |
46 | int protocol) | |
47 | { | |
48 | socklen_t addr_len; | |
49 | int sndbuf = 32768; | |
50 | ||
51 | memset(rth, 0, sizeof(*rth)); | |
52 | ||
53 | rth->fd = socket(AF_NETLINK, SOCK_RAW, protocol); | |
54 | if (rth->fd < 0) { | |
55 | perror("Cannot open netlink socket"); | |
56 | return -1; | |
57 | } | |
58 | ||
996c9314 LB |
59 | if (setsockopt(rth->fd, SOL_SOCKET, SO_SNDBUF, &sndbuf, sizeof(sndbuf)) |
60 | < 0) { | |
4d9ad5dc MS |
61 | perror("SO_SNDBUF"); |
62 | return -1; | |
63 | } | |
64 | ||
996c9314 LB |
65 | if (setsockopt(rth->fd, SOL_SOCKET, SO_RCVBUF, &rcvbuf, sizeof(rcvbuf)) |
66 | < 0) { | |
4d9ad5dc MS |
67 | perror("SO_RCVBUF"); |
68 | return -1; | |
69 | } | |
70 | ||
71 | memset(&rth->local, 0, sizeof(rth->local)); | |
72 | rth->local.nl_family = AF_NETLINK; | |
73 | rth->local.nl_groups = subscriptions; | |
74 | ||
996c9314 LB |
75 | if (bind(rth->fd, (struct sockaddr *)&rth->local, sizeof(rth->local)) |
76 | < 0) { | |
4d9ad5dc MS |
77 | perror("Cannot bind netlink socket"); |
78 | return -1; | |
79 | } | |
80 | addr_len = sizeof(rth->local); | |
996c9314 LB |
81 | if (getsockname(rth->fd, (struct sockaddr *)&rth->local, &addr_len) |
82 | < 0) { | |
4d9ad5dc MS |
83 | perror("Cannot getsockname"); |
84 | return -1; | |
85 | } | |
86 | if (addr_len != sizeof(rth->local)) { | |
87 | fprintf(stderr, "Wrong address length %d\n", addr_len); | |
88 | return -1; | |
89 | } | |
90 | if (rth->local.nl_family != AF_NETLINK) { | |
996c9314 LB |
91 | fprintf(stderr, "Wrong address family %d\n", |
92 | rth->local.nl_family); | |
4d9ad5dc MS |
93 | return -1; |
94 | } | |
bce18b18 | 95 | rth->seq = (uint32_t)time(NULL); |
4d9ad5dc MS |
96 | return 0; |
97 | } | |
98 | ||
99 | int rtnl_open(struct rtnl_handle *rth, unsigned subscriptions) | |
100 | { | |
101 | return rtnl_open_byproto(rth, subscriptions, NETLINK_ROUTE); | |
102 | } | |
103 | ||
104 | int rtnl_wilddump_request(struct rtnl_handle *rth, int family, int type) | |
105 | { | |
106 | struct { | |
107 | struct nlmsghdr nlh; | |
108 | struct rtgenmsg g; | |
109 | } req; | |
110 | ||
111 | memset(&req, 0, sizeof(req)); | |
112 | req.nlh.nlmsg_len = sizeof(req); | |
113 | req.nlh.nlmsg_type = type; | |
996c9314 | 114 | req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST; |
4d9ad5dc MS |
115 | req.nlh.nlmsg_pid = 0; |
116 | req.nlh.nlmsg_seq = rth->dump = ++rth->seq; | |
117 | req.g.rtgen_family = family; | |
118 | ||
996c9314 | 119 | return send(rth->fd, (void *)&req, sizeof(req), 0); |
4d9ad5dc MS |
120 | } |
121 | ||
122 | int rtnl_send(struct rtnl_handle *rth, const char *buf, int len) | |
123 | { | |
124 | return send(rth->fd, buf, len, 0); | |
125 | } | |
126 | ||
127 | int rtnl_send_check(struct rtnl_handle *rth, const char *buf, int len) | |
128 | { | |
129 | struct nlmsghdr *h; | |
130 | int status; | |
131 | char resp[1024]; | |
132 | ||
133 | status = send(rth->fd, buf, len, 0); | |
134 | if (status < 0) | |
135 | return status; | |
136 | ||
137 | /* Check for immediate errors */ | |
996c9314 | 138 | status = recv(rth->fd, resp, sizeof(resp), MSG_DONTWAIT | MSG_PEEK); |
4d9ad5dc MS |
139 | if (status < 0) { |
140 | if (errno == EAGAIN) | |
141 | return 0; | |
142 | return -1; | |
143 | } | |
144 | ||
145 | for (h = (struct nlmsghdr *)resp; NLMSG_OK(h, (uint32_t)status); | |
146 | h = NLMSG_NEXT(h, status)) { | |
147 | if (h->nlmsg_type == NLMSG_ERROR) { | |
996c9314 LB |
148 | struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(h); |
149 | if (h->nlmsg_len | |
150 | < NLMSG_LENGTH(sizeof(struct nlmsgerr))) | |
4d9ad5dc MS |
151 | fprintf(stderr, "ERROR truncated\n"); |
152 | else | |
153 | errno = -err->error; | |
154 | return -1; | |
155 | } | |
156 | } | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
161 | int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req, int len) | |
162 | { | |
163 | struct nlmsghdr nlh; | |
164 | struct sockaddr_nl nladdr; | |
996c9314 LB |
165 | struct iovec iov[2] = {{.iov_base = &nlh, .iov_len = sizeof(nlh)}, |
166 | {.iov_base = req, .iov_len = len}}; | |
4d9ad5dc MS |
167 | struct msghdr msg = { |
168 | .msg_name = &nladdr, | |
996c9314 | 169 | .msg_namelen = sizeof(nladdr), |
4d9ad5dc MS |
170 | .msg_iov = iov, |
171 | .msg_iovlen = 2, | |
172 | }; | |
173 | ||
174 | memset(&nladdr, 0, sizeof(nladdr)); | |
175 | nladdr.nl_family = AF_NETLINK; | |
176 | ||
177 | nlh.nlmsg_len = NLMSG_LENGTH(len); | |
178 | nlh.nlmsg_type = type; | |
996c9314 | 179 | nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST; |
4d9ad5dc MS |
180 | nlh.nlmsg_pid = 0; |
181 | nlh.nlmsg_seq = rth->dump = ++rth->seq; | |
182 | ||
183 | return sendmsg(rth->fd, &msg, 0); | |
184 | } | |
185 | ||
186 | int rtnl_dump_filter_l(struct rtnl_handle *rth, | |
187 | const struct rtnl_dump_filter_arg *arg) | |
188 | { | |
189 | struct sockaddr_nl nladdr; | |
3816a65d DS |
190 | char buf[16384]; |
191 | struct iovec iov = { | |
192 | .iov_base = buf, | |
193 | .iov_len = sizeof(buf), | |
194 | }; | |
4d9ad5dc MS |
195 | struct msghdr msg = { |
196 | .msg_name = &nladdr, | |
197 | .msg_namelen = sizeof(nladdr), | |
198 | .msg_iov = &iov, | |
199 | .msg_iovlen = 1, | |
200 | }; | |
4d9ad5dc | 201 | |
4d9ad5dc MS |
202 | while (1) { |
203 | int status; | |
204 | const struct rtnl_dump_filter_arg *a; | |
205 | int found_done = 0; | |
206 | int msglen = 0; | |
207 | ||
208 | iov.iov_len = sizeof(buf); | |
209 | status = recvmsg(rth->fd, &msg, 0); | |
210 | ||
211 | if (status < 0) { | |
212 | if (errno == EINTR || errno == EAGAIN) | |
213 | continue; | |
214 | fprintf(stderr, "netlink receive error %s (%d)\n", | |
215 | strerror(errno), errno); | |
216 | return -1; | |
217 | } | |
218 | ||
219 | if (status == 0) { | |
220 | fprintf(stderr, "EOF on netlink\n"); | |
221 | return -1; | |
222 | } | |
223 | ||
224 | for (a = arg; a->filter; a++) { | |
3816a65d | 225 | struct nlmsghdr *h = (struct nlmsghdr *)iov.iov_base; |
4d9ad5dc MS |
226 | msglen = status; |
227 | ||
228 | while (NLMSG_OK(h, (uint32_t)msglen)) { | |
229 | int err; | |
230 | ||
996c9314 LB |
231 | if (nladdr.nl_pid != 0 |
232 | || h->nlmsg_pid != rth->local.nl_pid | |
233 | || h->nlmsg_seq != rth->dump) { | |
4d9ad5dc MS |
234 | if (a->junk) { |
235 | err = a->junk(&nladdr, h, | |
236 | a->arg2); | |
237 | if (err < 0) | |
238 | return err; | |
239 | } | |
240 | goto skip_it; | |
241 | } | |
242 | ||
243 | if (h->nlmsg_type == NLMSG_DONE) { | |
244 | found_done = 1; | |
245 | break; /* process next filter */ | |
246 | } | |
247 | if (h->nlmsg_type == NLMSG_ERROR) { | |
dc7204b7 | 248 | struct nlmsgerr *merr = |
996c9314 LB |
249 | (struct nlmsgerr *)NLMSG_DATA( |
250 | h); | |
251 | if (h->nlmsg_len | |
252 | < NLMSG_LENGTH(sizeof( | |
253 | struct nlmsgerr))) { | |
4d9ad5dc MS |
254 | fprintf(stderr, |
255 | "ERROR truncated\n"); | |
256 | } else { | |
dc7204b7 | 257 | errno = -merr->error; |
4d9ad5dc MS |
258 | perror("RTNETLINK answers"); |
259 | } | |
260 | return -1; | |
261 | } | |
262 | err = a->filter(&nladdr, h, a->arg1); | |
263 | if (err < 0) | |
264 | return err; | |
265 | ||
996c9314 | 266 | skip_it: |
4d9ad5dc MS |
267 | h = NLMSG_NEXT(h, msglen); |
268 | } | |
269 | } | |
270 | ||
271 | if (found_done) | |
272 | return 0; | |
273 | ||
274 | if (msg.msg_flags & MSG_TRUNC) { | |
275 | fprintf(stderr, "Message truncated\n"); | |
276 | continue; | |
277 | } | |
278 | if (msglen) { | |
279 | fprintf(stderr, "!!!Remnant of size %d\n", msglen); | |
280 | exit(1); | |
281 | } | |
282 | } | |
283 | } | |
284 | ||
996c9314 LB |
285 | int rtnl_dump_filter(struct rtnl_handle *rth, rtnl_filter_t filter, void *arg1, |
286 | rtnl_filter_t junk, void *arg2) | |
4d9ad5dc MS |
287 | { |
288 | const struct rtnl_dump_filter_arg a[2] = { | |
996c9314 LB |
289 | {.filter = filter, .arg1 = arg1, .junk = junk, .arg2 = arg2}, |
290 | {.filter = NULL, .arg1 = NULL, .junk = NULL, .arg2 = NULL}}; | |
4d9ad5dc MS |
291 | |
292 | return rtnl_dump_filter_l(rth, a); | |
293 | } | |
294 | ||
295 | int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, pid_t peer, | |
996c9314 | 296 | unsigned groups, struct nlmsghdr *answer, rtnl_filter_t junk, |
4d9ad5dc MS |
297 | void *jarg) |
298 | { | |
299 | int status; | |
300 | unsigned seq; | |
301 | struct nlmsghdr *h; | |
302 | struct sockaddr_nl nladdr; | |
996c9314 | 303 | struct iovec iov = {.iov_base = (void *)n, .iov_len = n->nlmsg_len}; |
4d9ad5dc MS |
304 | struct msghdr msg = { |
305 | .msg_name = &nladdr, | |
306 | .msg_namelen = sizeof(nladdr), | |
307 | .msg_iov = &iov, | |
308 | .msg_iovlen = 1, | |
309 | }; | |
996c9314 | 310 | char buf[16384]; |
4d9ad5dc MS |
311 | |
312 | memset(&nladdr, 0, sizeof(nladdr)); | |
313 | nladdr.nl_family = AF_NETLINK; | |
314 | nladdr.nl_pid = peer; | |
315 | nladdr.nl_groups = groups; | |
316 | ||
317 | n->nlmsg_seq = seq = ++rtnl->seq; | |
318 | ||
319 | if (answer == NULL) | |
320 | n->nlmsg_flags |= NLM_F_ACK; | |
321 | ||
322 | status = sendmsg(rtnl->fd, &msg, 0); | |
323 | ||
324 | if (status < 0) { | |
325 | perror("Cannot talk to rtnetlink"); | |
326 | return -1; | |
327 | } | |
328 | ||
996c9314 | 329 | memset(buf, 0, sizeof(buf)); |
4d9ad5dc MS |
330 | |
331 | iov.iov_base = buf; | |
332 | ||
333 | while (1) { | |
334 | iov.iov_len = sizeof(buf); | |
335 | status = recvmsg(rtnl->fd, &msg, 0); | |
336 | ||
337 | if (status < 0) { | |
338 | if (errno == EINTR || errno == EAGAIN) | |
339 | continue; | |
340 | fprintf(stderr, "netlink receive error %s (%d)\n", | |
341 | strerror(errno), errno); | |
342 | return -1; | |
343 | } | |
344 | if (status == 0) { | |
345 | fprintf(stderr, "EOF on netlink\n"); | |
346 | return -1; | |
347 | } | |
348 | if (msg.msg_namelen != sizeof(nladdr)) { | |
996c9314 LB |
349 | fprintf(stderr, "sender address length == %d\n", |
350 | msg.msg_namelen); | |
4d9ad5dc MS |
351 | exit(1); |
352 | } | |
3816a65d DS |
353 | for (h = (struct nlmsghdr *)iov.iov_base; |
354 | status >= (int)sizeof(*h);) { | |
4d9ad5dc MS |
355 | int err; |
356 | int len = h->nlmsg_len; | |
357 | int l = len - sizeof(*h); | |
358 | ||
996c9314 | 359 | if (l < 0 || len > status) { |
4d9ad5dc MS |
360 | if (msg.msg_flags & MSG_TRUNC) { |
361 | fprintf(stderr, "Truncated message\n"); | |
362 | return -1; | |
363 | } | |
996c9314 LB |
364 | fprintf(stderr, |
365 | "!!!malformed message: len=%d\n", len); | |
4d9ad5dc MS |
366 | exit(1); |
367 | } | |
368 | ||
996c9314 LB |
369 | if ((int)nladdr.nl_pid != peer |
370 | || h->nlmsg_pid != rtnl->local.nl_pid | |
371 | || h->nlmsg_seq != seq) { | |
4d9ad5dc MS |
372 | if (junk) { |
373 | err = junk(&nladdr, h, jarg); | |
374 | if (err < 0) | |
375 | return err; | |
376 | } | |
377 | /* Don't forget to skip that message. */ | |
378 | status -= NLMSG_ALIGN(len); | |
996c9314 LB |
379 | h = (struct nlmsghdr *)((char *)h |
380 | + NLMSG_ALIGN(len)); | |
4d9ad5dc MS |
381 | continue; |
382 | } | |
383 | ||
384 | if (h->nlmsg_type == NLMSG_ERROR) { | |
dc7204b7 | 385 | struct nlmsgerr *merr = |
996c9314 | 386 | (struct nlmsgerr *)NLMSG_DATA(h); |
4d9ad5dc MS |
387 | if (l < (int)sizeof(struct nlmsgerr)) { |
388 | fprintf(stderr, "ERROR truncated\n"); | |
389 | } else { | |
dc7204b7 | 390 | errno = -merr->error; |
4d9ad5dc MS |
391 | if (errno == 0) { |
392 | if (answer) | |
996c9314 LB |
393 | memcpy(answer, h, |
394 | h->nlmsg_len); | |
4d9ad5dc MS |
395 | return 0; |
396 | } | |
397 | perror("RTNETLINK answers"); | |
398 | } | |
399 | return -1; | |
400 | } | |
401 | if (answer) { | |
402 | memcpy(answer, h, h->nlmsg_len); | |
403 | return 0; | |
404 | } | |
405 | ||
406 | fprintf(stderr, "Unexpected reply!!!\n"); | |
407 | ||
408 | status -= NLMSG_ALIGN(len); | |
996c9314 | 409 | h = (struct nlmsghdr *)((char *)h + NLMSG_ALIGN(len)); |
4d9ad5dc MS |
410 | } |
411 | if (msg.msg_flags & MSG_TRUNC) { | |
412 | fprintf(stderr, "Message truncated\n"); | |
413 | continue; | |
414 | } | |
415 | if (status) { | |
416 | fprintf(stderr, "!!!Remnant of size %d\n", status); | |
417 | exit(1); | |
418 | } | |
419 | } | |
420 | } | |
421 | ||
996c9314 | 422 | int rtnl_listen(struct rtnl_handle *rtnl, rtnl_filter_t handler, void *jarg) |
4d9ad5dc MS |
423 | { |
424 | int status; | |
425 | struct nlmsghdr *h; | |
426 | struct sockaddr_nl nladdr; | |
3816a65d DS |
427 | char buf[8192]; |
428 | struct iovec iov = { | |
429 | .iov_base = buf, | |
430 | .iov_len = sizeof(buf), | |
431 | }; | |
4d9ad5dc MS |
432 | struct msghdr msg = { |
433 | .msg_name = &nladdr, | |
434 | .msg_namelen = sizeof(nladdr), | |
435 | .msg_iov = &iov, | |
436 | .msg_iovlen = 1, | |
437 | }; | |
4d9ad5dc MS |
438 | |
439 | memset(&nladdr, 0, sizeof(nladdr)); | |
440 | nladdr.nl_family = AF_NETLINK; | |
441 | nladdr.nl_pid = 0; | |
442 | nladdr.nl_groups = 0; | |
443 | ||
4d9ad5dc MS |
444 | while (1) { |
445 | iov.iov_len = sizeof(buf); | |
446 | status = recvmsg(rtnl->fd, &msg, 0); | |
447 | ||
448 | if (status < 0) { | |
449 | if (errno == EINTR || errno == EAGAIN) | |
450 | continue; | |
451 | fprintf(stderr, "netlink receive error %s (%d)\n", | |
452 | strerror(errno), errno); | |
453 | if (errno == ENOBUFS) | |
454 | continue; | |
455 | return -1; | |
456 | } | |
457 | if (status == 0) { | |
458 | fprintf(stderr, "EOF on netlink\n"); | |
459 | return -1; | |
460 | } | |
461 | if (msg.msg_namelen != sizeof(nladdr)) { | |
996c9314 LB |
462 | fprintf(stderr, "Sender address length == %d\n", |
463 | msg.msg_namelen); | |
4d9ad5dc MS |
464 | exit(1); |
465 | } | |
996c9314 | 466 | for (h = (struct nlmsghdr *)buf; status >= (int)sizeof(*h);) { |
4d9ad5dc MS |
467 | int err; |
468 | int len = h->nlmsg_len; | |
469 | int l = len - sizeof(*h); | |
470 | ||
996c9314 | 471 | if (l < 0 || len > status) { |
4d9ad5dc MS |
472 | if (msg.msg_flags & MSG_TRUNC) { |
473 | fprintf(stderr, "Truncated message\n"); | |
474 | return -1; | |
475 | } | |
996c9314 LB |
476 | fprintf(stderr, |
477 | "!!!malformed message: len=%d\n", len); | |
4d9ad5dc MS |
478 | exit(1); |
479 | } | |
480 | ||
481 | err = handler(&nladdr, h, jarg); | |
482 | if (err < 0) | |
483 | return err; | |
484 | ||
485 | status -= NLMSG_ALIGN(len); | |
996c9314 | 486 | h = (struct nlmsghdr *)((char *)h + NLMSG_ALIGN(len)); |
4d9ad5dc MS |
487 | } |
488 | if (msg.msg_flags & MSG_TRUNC) { | |
489 | fprintf(stderr, "Message truncated\n"); | |
490 | continue; | |
491 | } | |
492 | if (status) { | |
493 | fprintf(stderr, "!!!Remnant of size %d\n", status); | |
494 | exit(1); | |
495 | } | |
496 | } | |
497 | } | |
498 | ||
996c9314 | 499 | int rtnl_from_file(FILE *rtnl, rtnl_filter_t handler, void *jarg) |
4d9ad5dc | 500 | { |
4d9ad5dc | 501 | struct sockaddr_nl nladdr; |
996c9314 LB |
502 | char buf[8192]; |
503 | struct nlmsghdr *h = (void *)buf; | |
4d9ad5dc MS |
504 | |
505 | memset(&nladdr, 0, sizeof(nladdr)); | |
506 | nladdr.nl_family = AF_NETLINK; | |
507 | nladdr.nl_pid = 0; | |
508 | nladdr.nl_groups = 0; | |
509 | ||
510 | while (1) { | |
09ed14e8 A |
511 | int err; |
512 | size_t l, rl, arl; | |
4d9ad5dc | 513 | |
09ed14e8 A |
514 | rl = sizeof(*h); |
515 | arl = fread(&buf, 1, rl, rtnl); | |
4d9ad5dc | 516 | |
09ed14e8 A |
517 | if (arl != rl) { |
518 | if (arl == 0) | |
519 | return 0; | |
520 | ||
521 | if (ferror(rtnl)) | |
522 | fprintf(stderr, "%s: header read failed\n", | |
523 | __func__); | |
524 | else | |
525 | fprintf(stderr, "%s: truncated header\n", | |
526 | __func__); | |
4d9ad5dc MS |
527 | return -1; |
528 | } | |
4d9ad5dc | 529 | |
09ed14e8 | 530 | l = h->nlmsg_len > rl ? h->nlmsg_len - rl : 0; |
4d9ad5dc | 531 | |
09ed14e8 A |
532 | if (l == 0 || (l + (size_t)NLMSG_HDRLEN) > sizeof(buf)) { |
533 | fprintf(stderr, "%s: malformed message: len=%zu @%lu\n", | |
534 | __func__, (size_t)h->nlmsg_len, ftell(rtnl)); | |
4d9ad5dc MS |
535 | return -1; |
536 | } | |
537 | ||
09ed14e8 A |
538 | rl = NLMSG_ALIGN(l); |
539 | arl = fread(NLMSG_DATA(h), 1, rl, rtnl); | |
4d9ad5dc | 540 | |
09ed14e8 A |
541 | if (arl != rl) { |
542 | if (ferror(rtnl)) | |
543 | fprintf(stderr, "%s: msg read failed\n", | |
544 | __func__); | |
545 | else | |
546 | fprintf(stderr, "%s: truncated message\n", | |
547 | __func__); | |
4d9ad5dc MS |
548 | return -1; |
549 | } | |
550 | ||
551 | err = handler(&nladdr, h, jarg); | |
552 | if (err < 0) | |
553 | return err; | |
554 | } | |
555 | } | |
556 | ||
557 | int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data) | |
558 | { | |
559 | int len = RTA_LENGTH(4); | |
560 | struct rtattr *rta; | |
561 | if ((int)(NLMSG_ALIGN(n->nlmsg_len) + len) > maxlen) { | |
996c9314 LB |
562 | fprintf(stderr, |
563 | "addattr32: Error! max allowed bound %d exceeded\n", | |
564 | maxlen); | |
4d9ad5dc MS |
565 | return -1; |
566 | } | |
567 | rta = NLMSG_TAIL(n); | |
568 | rta->rta_type = type; | |
569 | rta->rta_len = len; | |
570 | memcpy(RTA_DATA(rta), &data, 4); | |
571 | n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len; | |
572 | return 0; | |
573 | } | |
574 | ||
575 | int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data, | |
576 | int alen) | |
577 | { | |
578 | int len = RTA_LENGTH(alen); | |
579 | struct rtattr *rta; | |
580 | ||
581 | if ((int)(NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len)) > maxlen) { | |
996c9314 LB |
582 | fprintf(stderr, |
583 | "addattr_l ERROR: message exceeded bound of %d\n", | |
584 | maxlen); | |
4d9ad5dc MS |
585 | return -1; |
586 | } | |
587 | rta = NLMSG_TAIL(n); | |
588 | rta->rta_type = type; | |
589 | rta->rta_len = len; | |
590 | ||
591 | if (data) | |
592 | memcpy(RTA_DATA(rta), data, alen); | |
593 | else | |
594 | assert(alen == 0); | |
595 | ||
596 | n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len); | |
597 | return 0; | |
598 | } | |
599 | ||
600 | int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len) | |
601 | { | |
602 | if ((int)(NLMSG_ALIGN(n->nlmsg_len) + NLMSG_ALIGN(len)) > maxlen) { | |
996c9314 LB |
603 | fprintf(stderr, |
604 | "addraw_l ERROR: message exceeded bound of %d\n", | |
605 | maxlen); | |
4d9ad5dc MS |
606 | return -1; |
607 | } | |
608 | ||
609 | memcpy(NLMSG_TAIL(n), data, len); | |
996c9314 | 610 | memset((uint8_t *)NLMSG_TAIL(n) + len, 0, NLMSG_ALIGN(len) - len); |
4d9ad5dc MS |
611 | n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + NLMSG_ALIGN(len); |
612 | return 0; | |
613 | } | |
614 | ||
615 | struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type) | |
616 | { | |
617 | struct rtattr *nest = NLMSG_TAIL(n); | |
618 | ||
619 | addattr_l(n, maxlen, type, NULL, 0); | |
620 | return nest; | |
621 | } | |
622 | ||
623 | int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest) | |
624 | { | |
625 | nest->rta_len = (uint8_t *)NLMSG_TAIL(n) - (uint8_t *)nest; | |
626 | return n->nlmsg_len; | |
627 | } | |
628 | ||
629 | struct rtattr *addattr_nest_compat(struct nlmsghdr *n, int maxlen, int type, | |
630 | const void *data, int len) | |
631 | { | |
632 | struct rtattr *start = NLMSG_TAIL(n); | |
633 | ||
634 | addattr_l(n, maxlen, type, data, len); | |
635 | addattr_nest(n, maxlen, type); | |
636 | return start; | |
637 | } | |
638 | ||
639 | int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *start) | |
640 | { | |
641 | struct rtattr *nest = start + NLMSG_ALIGN(start->rta_len); | |
642 | ||
643 | start->rta_len = (uint8_t *)NLMSG_TAIL(n) - (uint8_t *)start; | |
644 | addattr_nest_end(n, nest); | |
645 | return n->nlmsg_len; | |
646 | } | |
647 | ||
648 | int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data) | |
649 | { | |
650 | int len = RTA_LENGTH(4); | |
651 | struct rtattr *subrta; | |
652 | ||
653 | if ((int)(RTA_ALIGN(rta->rta_len) + len) > maxlen) { | |
996c9314 LB |
654 | fprintf(stderr, |
655 | "rta_addattr32: Error! max allowed bound %d exceeded\n", | |
656 | maxlen); | |
4d9ad5dc MS |
657 | return -1; |
658 | } | |
996c9314 | 659 | subrta = (struct rtattr *)(((char *)rta) + RTA_ALIGN(rta->rta_len)); |
4d9ad5dc MS |
660 | subrta->rta_type = type; |
661 | subrta->rta_len = len; | |
662 | memcpy(RTA_DATA(subrta), &data, 4); | |
663 | rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len; | |
664 | return 0; | |
665 | } | |
666 | ||
996c9314 LB |
667 | int rta_addattr_l(struct rtattr *rta, int maxlen, int type, const void *data, |
668 | int alen) | |
4d9ad5dc MS |
669 | { |
670 | struct rtattr *subrta; | |
671 | int len = RTA_LENGTH(alen); | |
672 | ||
673 | if ((int)(RTA_ALIGN(rta->rta_len) + RTA_ALIGN(len)) > maxlen) { | |
996c9314 LB |
674 | fprintf(stderr, |
675 | "rta_addattr_l: Error! max allowed bound %d exceeded\n", | |
676 | maxlen); | |
4d9ad5dc MS |
677 | return -1; |
678 | } | |
996c9314 | 679 | subrta = (struct rtattr *)(((char *)rta) + RTA_ALIGN(rta->rta_len)); |
4d9ad5dc MS |
680 | subrta->rta_type = type; |
681 | subrta->rta_len = len; | |
682 | memcpy(RTA_DATA(subrta), data, alen); | |
683 | rta->rta_len = NLMSG_ALIGN(rta->rta_len) + RTA_ALIGN(len); | |
684 | return 0; | |
685 | } | |
686 | ||
687 | int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len) | |
688 | { | |
689 | memset(tb, 0, sizeof(struct rtattr *) * (max + 1)); | |
690 | while (RTA_OK(rta, len)) { | |
691 | if ((rta->rta_type <= max) && (!tb[rta->rta_type])) | |
692 | tb[rta->rta_type] = rta; | |
996c9314 | 693 | rta = RTA_NEXT(rta, len); |
4d9ad5dc MS |
694 | } |
695 | if (len) | |
996c9314 LB |
696 | fprintf(stderr, "!!!Deficit %d, rta_len=%d\n", len, |
697 | rta->rta_len); | |
4d9ad5dc MS |
698 | return 0; |
699 | } | |
700 | ||
996c9314 LB |
701 | int parse_rtattr_byindex(struct rtattr *tb[], int max, struct rtattr *rta, |
702 | int len) | |
4d9ad5dc MS |
703 | { |
704 | int i = 0; | |
705 | ||
706 | memset(tb, 0, sizeof(struct rtattr *) * max); | |
707 | while (RTA_OK(rta, len)) { | |
708 | if (rta->rta_type <= max && i < max) | |
709 | tb[i++] = rta; | |
996c9314 | 710 | rta = RTA_NEXT(rta, len); |
4d9ad5dc MS |
711 | } |
712 | if (len) | |
996c9314 LB |
713 | fprintf(stderr, "!!!Deficit %d, rta_len=%d\n", len, |
714 | rta->rta_len); | |
4d9ad5dc MS |
715 | return i; |
716 | } | |
717 | ||
996c9314 LB |
718 | int __parse_rtattr_nested_compat(struct rtattr *tb[], int max, |
719 | struct rtattr *rta, int len) | |
4d9ad5dc MS |
720 | { |
721 | if ((int)RTA_PAYLOAD(rta) < len) | |
722 | return -1; | |
723 | if (RTA_PAYLOAD(rta) >= RTA_ALIGN(len) + sizeof(struct rtattr)) { | |
996c9314 LB |
724 | rta = (struct rtattr *)(uint8_t *)RTA_DATA(rta) |
725 | + RTA_ALIGN(len); | |
4d9ad5dc MS |
726 | return parse_rtattr_nested(tb, max, rta); |
727 | } | |
728 | memset(tb, 0, sizeof(struct rtattr *) * (max + 1)); | |
729 | return 0; | |
730 | } | |
731 | ||
732 | #endif /* __linux__ */ |