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Commit | Line | Data |
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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> | |
15 | #include <unistd.h> | |
16 | #include <syslog.h> | |
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> | |
25 | ||
26 | #include "libnetlink.h" | |
27 | ||
7f03191f PM |
28 | int rcvbuf = 1024 * 1024; |
29 | ||
aba5acdf SH |
30 | void rtnl_close(struct rtnl_handle *rth) |
31 | { | |
3bfa73ff SH |
32 | if (rth->fd >= 0) { |
33 | close(rth->fd); | |
34 | rth->fd = -1; | |
35 | } | |
aba5acdf SH |
36 | } |
37 | ||
8ed63ab1 SH |
38 | int rtnl_open_byproto(struct rtnl_handle *rth, unsigned subscriptions, |
39 | int protocol) | |
aba5acdf | 40 | { |
f332d169 | 41 | socklen_t addr_len; |
007d3a3e | 42 | int sndbuf = 32768; |
aba5acdf | 43 | |
b16621ca | 44 | memset(rth, 0, sizeof(*rth)); |
aba5acdf | 45 | |
bcb9d403 | 46 | rth->fd = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, protocol); |
aba5acdf SH |
47 | if (rth->fd < 0) { |
48 | perror("Cannot open netlink socket"); | |
49 | return -1; | |
50 | } | |
51 | ||
007d3a3e SH |
52 | if (setsockopt(rth->fd,SOL_SOCKET,SO_SNDBUF,&sndbuf,sizeof(sndbuf)) < 0) { |
53 | perror("SO_SNDBUF"); | |
54 | return -1; | |
55 | } | |
56 | ||
57 | if (setsockopt(rth->fd,SOL_SOCKET,SO_RCVBUF,&rcvbuf,sizeof(rcvbuf)) < 0) { | |
58 | perror("SO_RCVBUF"); | |
59 | return -1; | |
60 | } | |
61 | ||
aba5acdf SH |
62 | memset(&rth->local, 0, sizeof(rth->local)); |
63 | rth->local.nl_family = AF_NETLINK; | |
64 | rth->local.nl_groups = subscriptions; | |
65 | ||
66 | if (bind(rth->fd, (struct sockaddr*)&rth->local, sizeof(rth->local)) < 0) { | |
67 | perror("Cannot bind netlink socket"); | |
68 | return -1; | |
69 | } | |
70 | addr_len = sizeof(rth->local); | |
71 | if (getsockname(rth->fd, (struct sockaddr*)&rth->local, &addr_len) < 0) { | |
72 | perror("Cannot getsockname"); | |
73 | return -1; | |
74 | } | |
75 | if (addr_len != sizeof(rth->local)) { | |
76 | fprintf(stderr, "Wrong address length %d\n", addr_len); | |
77 | return -1; | |
78 | } | |
79 | if (rth->local.nl_family != AF_NETLINK) { | |
80 | fprintf(stderr, "Wrong address family %d\n", rth->local.nl_family); | |
81 | return -1; | |
82 | } | |
83 | rth->seq = time(NULL); | |
84 | return 0; | |
85 | } | |
86 | ||
c7699875 | 87 | int rtnl_open(struct rtnl_handle *rth, unsigned subscriptions) |
88 | { | |
89 | return rtnl_open_byproto(rth, subscriptions, NETLINK_ROUTE); | |
90 | } | |
91 | ||
aba5acdf | 92 | int rtnl_wilddump_request(struct rtnl_handle *rth, int family, int type) |
9eff0e5c VY |
93 | { |
94 | return rtnl_wilddump_req_filter(rth, family, type, RTEXT_FILTER_VF); | |
95 | } | |
96 | ||
97 | int rtnl_wilddump_req_filter(struct rtnl_handle *rth, int family, int type, | |
98 | __u32 filt_mask) | |
aba5acdf SH |
99 | { |
100 | struct { | |
101 | struct nlmsghdr nlh; | |
63338dca | 102 | struct ifinfomsg ifm; |
257422f7 LJ |
103 | /* attribute has to be NLMSG aligned */ |
104 | struct rtattr ext_req __attribute__ ((aligned(NLMSG_ALIGNTO))); | |
bd886ebb | 105 | __u32 ext_filter_mask; |
aba5acdf | 106 | } req; |
aba5acdf | 107 | |
8ed63ab1 | 108 | memset(&req, 0, sizeof(req)); |
aba5acdf SH |
109 | req.nlh.nlmsg_len = sizeof(req); |
110 | req.nlh.nlmsg_type = type; | |
aa38c3ee | 111 | req.nlh.nlmsg_flags = NLM_F_DUMP|NLM_F_REQUEST; |
aba5acdf SH |
112 | req.nlh.nlmsg_pid = 0; |
113 | req.nlh.nlmsg_seq = rth->dump = ++rth->seq; | |
63338dca | 114 | req.ifm.ifi_family = family; |
aba5acdf | 115 | |
bd886ebb RG |
116 | req.ext_req.rta_type = IFLA_EXT_MASK; |
117 | req.ext_req.rta_len = RTA_LENGTH(sizeof(__u32)); | |
9eff0e5c | 118 | req.ext_filter_mask = filt_mask; |
bd886ebb | 119 | |
f31a37f7 | 120 | return send(rth->fd, (void*)&req, sizeof(req), 0); |
aba5acdf SH |
121 | } |
122 | ||
6cf8398f | 123 | int rtnl_send(struct rtnl_handle *rth, const void *buf, int len) |
aba5acdf | 124 | { |
f31a37f7 SH |
125 | return send(rth->fd, buf, len, 0); |
126 | } | |
127 | ||
6cf8398f | 128 | int rtnl_send_check(struct rtnl_handle *rth, const void *buf, int len) |
f31a37f7 | 129 | { |
54bb35c6 SH |
130 | struct nlmsghdr *h; |
131 | int status; | |
132 | char resp[1024]; | |
aba5acdf | 133 | |
f31a37f7 | 134 | status = send(rth->fd, buf, len, 0); |
54bb35c6 SH |
135 | if (status < 0) |
136 | return status; | |
137 | ||
2d8240f8 SH |
138 | /* Check for immediate errors */ |
139 | status = recv(rth->fd, resp, sizeof(resp), MSG_DONTWAIT|MSG_PEEK); | |
54bb35c6 SH |
140 | if (status < 0) { |
141 | if (errno == EAGAIN) | |
142 | return 0; | |
143 | return -1; | |
144 | } | |
145 | ||
146 | for (h = (struct nlmsghdr *)resp; NLMSG_OK(h, status); | |
147 | h = NLMSG_NEXT(h, status)) { | |
148 | if (h->nlmsg_type == NLMSG_ERROR) { | |
149 | struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(h); | |
150 | if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) | |
151 | fprintf(stderr, "ERROR truncated\n"); | |
152 | else | |
153 | errno = -err->error; | |
24f38182 | 154 | return -1; |
54bb35c6 | 155 | } |
54bb35c6 SH |
156 | } |
157 | ||
158 | return 0; | |
aba5acdf SH |
159 | } |
160 | ||
161 | int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req, int len) | |
162 | { | |
163 | struct nlmsghdr nlh; | |
6cf8398f | 164 | struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK }; |
8ed63ab1 SH |
165 | struct iovec iov[2] = { |
166 | { .iov_base = &nlh, .iov_len = sizeof(nlh) }, | |
167 | { .iov_base = req, .iov_len = len } | |
168 | }; | |
aba5acdf | 169 | struct msghdr msg = { |
8ed63ab1 SH |
170 | .msg_name = &nladdr, |
171 | .msg_namelen = sizeof(nladdr), | |
172 | .msg_iov = iov, | |
173 | .msg_iovlen = 2, | |
aba5acdf SH |
174 | }; |
175 | ||
aba5acdf SH |
176 | nlh.nlmsg_len = NLMSG_LENGTH(len); |
177 | nlh.nlmsg_type = type; | |
aa38c3ee | 178 | nlh.nlmsg_flags = NLM_F_DUMP|NLM_F_REQUEST; |
aba5acdf SH |
179 | nlh.nlmsg_pid = 0; |
180 | nlh.nlmsg_seq = rth->dump = ++rth->seq; | |
181 | ||
182 | return sendmsg(rth->fd, &msg, 0); | |
183 | } | |
184 | ||
b49240ec SH |
185 | int rtnl_dump_filter_l(struct rtnl_handle *rth, |
186 | const struct rtnl_dump_filter_arg *arg) | |
aba5acdf | 187 | { |
aba5acdf | 188 | struct sockaddr_nl nladdr; |
8ed63ab1 SH |
189 | struct iovec iov; |
190 | struct msghdr msg = { | |
191 | .msg_name = &nladdr, | |
192 | .msg_namelen = sizeof(nladdr), | |
193 | .msg_iov = &iov, | |
194 | .msg_iovlen = 1, | |
195 | }; | |
196 | char buf[16384]; | |
16f02e14 | 197 | int dump_intr = 0; |
aba5acdf | 198 | |
8ed63ab1 | 199 | iov.iov_base = buf; |
aba5acdf SH |
200 | while (1) { |
201 | int status; | |
b49240ec | 202 | const struct rtnl_dump_filter_arg *a; |
3bc1c4f2 BG |
203 | int found_done = 0; |
204 | int msglen = 0; | |
aba5acdf | 205 | |
8ed63ab1 | 206 | iov.iov_len = sizeof(buf); |
aba5acdf SH |
207 | status = recvmsg(rth->fd, &msg, 0); |
208 | ||
209 | if (status < 0) { | |
aa8032e6 | 210 | if (errno == EINTR || errno == EAGAIN) |
aba5acdf | 211 | continue; |
aa8032e6 SH |
212 | fprintf(stderr, "netlink receive error %s (%d)\n", |
213 | strerror(errno), errno); | |
214 | return -1; | |
aba5acdf | 215 | } |
8ed63ab1 | 216 | |
aba5acdf SH |
217 | if (status == 0) { |
218 | fprintf(stderr, "EOF on netlink\n"); | |
219 | return -1; | |
220 | } | |
aba5acdf | 221 | |
b49240ec SH |
222 | for (a = arg; a->filter; a++) { |
223 | struct nlmsghdr *h = (struct nlmsghdr*)buf; | |
3bc1c4f2 | 224 | msglen = status; |
b49240ec | 225 | |
3bc1c4f2 | 226 | while (NLMSG_OK(h, msglen)) { |
b49240ec SH |
227 | int err; |
228 | ||
229 | if (nladdr.nl_pid != 0 || | |
230 | h->nlmsg_pid != rth->local.nl_pid || | |
cd70f3f5 | 231 | h->nlmsg_seq != rth->dump) |
b49240ec | 232 | goto skip_it; |
aba5acdf | 233 | |
16f02e14 ND |
234 | if (h->nlmsg_flags & NLM_F_DUMP_INTR) |
235 | dump_intr = 1; | |
236 | ||
3bc1c4f2 BG |
237 | if (h->nlmsg_type == NLMSG_DONE) { |
238 | found_done = 1; | |
239 | break; /* process next filter */ | |
240 | } | |
b49240ec SH |
241 | if (h->nlmsg_type == NLMSG_ERROR) { |
242 | struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(h); | |
243 | if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) { | |
244 | fprintf(stderr, | |
245 | "ERROR truncated\n"); | |
246 | } else { | |
247 | errno = -err->error; | |
248 | perror("RTNETLINK answers"); | |
249 | } | |
250 | return -1; | |
aba5acdf | 251 | } |
b49240ec SH |
252 | err = a->filter(&nladdr, h, a->arg1); |
253 | if (err < 0) | |
254 | return err; | |
aba5acdf SH |
255 | |
256 | skip_it: | |
3bc1c4f2 | 257 | h = NLMSG_NEXT(h, msglen); |
b49240ec | 258 | } |
3bc1c4f2 BG |
259 | } |
260 | ||
16f02e14 ND |
261 | if (found_done) { |
262 | if (dump_intr) | |
263 | fprintf(stderr, | |
264 | "Dump was interrupted and may be inconsistent.\n"); | |
3bc1c4f2 | 265 | return 0; |
16f02e14 | 266 | } |
3bc1c4f2 | 267 | |
aba5acdf SH |
268 | if (msg.msg_flags & MSG_TRUNC) { |
269 | fprintf(stderr, "Message truncated\n"); | |
270 | continue; | |
271 | } | |
3bc1c4f2 BG |
272 | if (msglen) { |
273 | fprintf(stderr, "!!!Remnant of size %d\n", msglen); | |
aba5acdf SH |
274 | exit(1); |
275 | } | |
276 | } | |
277 | } | |
278 | ||
b49240ec SH |
279 | int rtnl_dump_filter(struct rtnl_handle *rth, |
280 | rtnl_filter_t filter, | |
cd70f3f5 | 281 | void *arg1) |
b49240ec SH |
282 | { |
283 | const struct rtnl_dump_filter_arg a[2] = { | |
cd70f3f5 SH |
284 | { .filter = filter, .arg1 = arg1, }, |
285 | { .filter = NULL, .arg1 = NULL, }, | |
b49240ec SH |
286 | }; |
287 | ||
288 | return rtnl_dump_filter_l(rth, a); | |
289 | } | |
290 | ||
aba5acdf | 291 | int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, pid_t peer, |
cd70f3f5 | 292 | unsigned groups, struct nlmsghdr *answer) |
aba5acdf SH |
293 | { |
294 | int status; | |
295 | unsigned seq; | |
296 | struct nlmsghdr *h; | |
297 | struct sockaddr_nl nladdr; | |
fb229759 SH |
298 | struct iovec iov = { |
299 | .iov_base = (void*) n, | |
300 | .iov_len = n->nlmsg_len | |
301 | }; | |
aba5acdf | 302 | struct msghdr msg = { |
8ed63ab1 SH |
303 | .msg_name = &nladdr, |
304 | .msg_namelen = sizeof(nladdr), | |
305 | .msg_iov = &iov, | |
306 | .msg_iovlen = 1, | |
aba5acdf | 307 | }; |
8ed63ab1 | 308 | char buf[16384]; |
aba5acdf SH |
309 | |
310 | memset(&nladdr, 0, sizeof(nladdr)); | |
311 | nladdr.nl_family = AF_NETLINK; | |
312 | nladdr.nl_pid = peer; | |
313 | nladdr.nl_groups = groups; | |
314 | ||
315 | n->nlmsg_seq = seq = ++rtnl->seq; | |
007d3a3e | 316 | |
aba5acdf SH |
317 | if (answer == NULL) |
318 | n->nlmsg_flags |= NLM_F_ACK; | |
319 | ||
320 | status = sendmsg(rtnl->fd, &msg, 0); | |
321 | ||
322 | if (status < 0) { | |
323 | perror("Cannot talk to rtnetlink"); | |
324 | return -1; | |
325 | } | |
326 | ||
007d3a3e SH |
327 | memset(buf,0,sizeof(buf)); |
328 | ||
aba5acdf SH |
329 | iov.iov_base = buf; |
330 | ||
331 | while (1) { | |
332 | iov.iov_len = sizeof(buf); | |
333 | status = recvmsg(rtnl->fd, &msg, 0); | |
334 | ||
335 | if (status < 0) { | |
aa8032e6 | 336 | if (errno == EINTR || errno == EAGAIN) |
aba5acdf | 337 | continue; |
aa8032e6 SH |
338 | fprintf(stderr, "netlink receive error %s (%d)\n", |
339 | strerror(errno), errno); | |
340 | return -1; | |
aba5acdf SH |
341 | } |
342 | if (status == 0) { | |
343 | fprintf(stderr, "EOF on netlink\n"); | |
344 | return -1; | |
345 | } | |
346 | if (msg.msg_namelen != sizeof(nladdr)) { | |
347 | fprintf(stderr, "sender address length == %d\n", msg.msg_namelen); | |
348 | exit(1); | |
349 | } | |
350 | for (h = (struct nlmsghdr*)buf; status >= sizeof(*h); ) { | |
aba5acdf SH |
351 | int len = h->nlmsg_len; |
352 | int l = len - sizeof(*h); | |
353 | ||
cd70f3f5 | 354 | if (l < 0 || len>status) { |
aba5acdf SH |
355 | if (msg.msg_flags & MSG_TRUNC) { |
356 | fprintf(stderr, "Truncated message\n"); | |
357 | return -1; | |
358 | } | |
359 | fprintf(stderr, "!!!malformed message: len=%d\n", len); | |
360 | exit(1); | |
361 | } | |
362 | ||
10f57ef1 | 363 | if (nladdr.nl_pid != peer || |
364 | h->nlmsg_pid != rtnl->local.nl_pid || | |
aba5acdf | 365 | h->nlmsg_seq != seq) { |
4cca16f2 SH |
366 | /* Don't forget to skip that message. */ |
367 | status -= NLMSG_ALIGN(len); | |
368 | h = (struct nlmsghdr*)((char*)h + NLMSG_ALIGN(len)); | |
aba5acdf SH |
369 | continue; |
370 | } | |
371 | ||
372 | if (h->nlmsg_type == NLMSG_ERROR) { | |
373 | struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(h); | |
374 | if (l < sizeof(struct nlmsgerr)) { | |
375 | fprintf(stderr, "ERROR truncated\n"); | |
376 | } else { | |
b8cf1e9a | 377 | if (!err->error) { |
aba5acdf SH |
378 | if (answer) |
379 | memcpy(answer, h, h->nlmsg_len); | |
380 | return 0; | |
381 | } | |
b8cf1e9a PE |
382 | |
383 | fprintf(stderr, "RTNETLINK answers: %s\n", strerror(-err->error)); | |
384 | errno = -err->error; | |
aba5acdf SH |
385 | } |
386 | return -1; | |
387 | } | |
388 | if (answer) { | |
389 | memcpy(answer, h, h->nlmsg_len); | |
390 | return 0; | |
391 | } | |
392 | ||
393 | fprintf(stderr, "Unexpected reply!!!\n"); | |
394 | ||
395 | status -= NLMSG_ALIGN(len); | |
396 | h = (struct nlmsghdr*)((char*)h + NLMSG_ALIGN(len)); | |
397 | } | |
398 | if (msg.msg_flags & MSG_TRUNC) { | |
399 | fprintf(stderr, "Message truncated\n"); | |
400 | continue; | |
401 | } | |
402 | if (status) { | |
403 | fprintf(stderr, "!!!Remnant of size %d\n", status); | |
404 | exit(1); | |
405 | } | |
406 | } | |
407 | } | |
408 | ||
8ed63ab1 | 409 | int rtnl_listen(struct rtnl_handle *rtnl, |
6dc9f016 SH |
410 | rtnl_filter_t handler, |
411 | void *jarg) | |
aba5acdf SH |
412 | { |
413 | int status; | |
414 | struct nlmsghdr *h; | |
415 | struct sockaddr_nl nladdr; | |
416 | struct iovec iov; | |
aba5acdf | 417 | struct msghdr msg = { |
8ed63ab1 SH |
418 | .msg_name = &nladdr, |
419 | .msg_namelen = sizeof(nladdr), | |
420 | .msg_iov = &iov, | |
421 | .msg_iovlen = 1, | |
aba5acdf | 422 | }; |
8ed63ab1 | 423 | char buf[8192]; |
aba5acdf SH |
424 | |
425 | memset(&nladdr, 0, sizeof(nladdr)); | |
426 | nladdr.nl_family = AF_NETLINK; | |
427 | nladdr.nl_pid = 0; | |
428 | nladdr.nl_groups = 0; | |
429 | ||
aba5acdf | 430 | iov.iov_base = buf; |
aba5acdf SH |
431 | while (1) { |
432 | iov.iov_len = sizeof(buf); | |
433 | status = recvmsg(rtnl->fd, &msg, 0); | |
434 | ||
435 | if (status < 0) { | |
aa8032e6 | 436 | if (errno == EINTR || errno == EAGAIN) |
aba5acdf | 437 | continue; |
aa8032e6 SH |
438 | fprintf(stderr, "netlink receive error %s (%d)\n", |
439 | strerror(errno), errno); | |
7f03191f PM |
440 | if (errno == ENOBUFS) |
441 | continue; | |
aa8032e6 | 442 | return -1; |
aba5acdf SH |
443 | } |
444 | if (status == 0) { | |
445 | fprintf(stderr, "EOF on netlink\n"); | |
446 | return -1; | |
447 | } | |
448 | if (msg.msg_namelen != sizeof(nladdr)) { | |
449 | fprintf(stderr, "Sender address length == %d\n", msg.msg_namelen); | |
450 | exit(1); | |
451 | } | |
452 | for (h = (struct nlmsghdr*)buf; status >= sizeof(*h); ) { | |
453 | int err; | |
454 | int len = h->nlmsg_len; | |
455 | int l = len - sizeof(*h); | |
456 | ||
457 | if (l<0 || len>status) { | |
458 | if (msg.msg_flags & MSG_TRUNC) { | |
459 | fprintf(stderr, "Truncated message\n"); | |
460 | return -1; | |
461 | } | |
462 | fprintf(stderr, "!!!malformed message: len=%d\n", len); | |
463 | exit(1); | |
464 | } | |
465 | ||
466 | err = handler(&nladdr, h, jarg); | |
467 | if (err < 0) | |
468 | return err; | |
469 | ||
470 | status -= NLMSG_ALIGN(len); | |
471 | h = (struct nlmsghdr*)((char*)h + NLMSG_ALIGN(len)); | |
472 | } | |
473 | if (msg.msg_flags & MSG_TRUNC) { | |
474 | fprintf(stderr, "Message truncated\n"); | |
475 | continue; | |
476 | } | |
477 | if (status) { | |
478 | fprintf(stderr, "!!!Remnant of size %d\n", status); | |
479 | exit(1); | |
480 | } | |
481 | } | |
482 | } | |
483 | ||
6dc9f016 SH |
484 | int rtnl_from_file(FILE *rtnl, rtnl_filter_t handler, |
485 | void *jarg) | |
aba5acdf SH |
486 | { |
487 | int status; | |
488 | struct sockaddr_nl nladdr; | |
489 | char buf[8192]; | |
490 | struct nlmsghdr *h = (void*)buf; | |
491 | ||
492 | memset(&nladdr, 0, sizeof(nladdr)); | |
493 | nladdr.nl_family = AF_NETLINK; | |
494 | nladdr.nl_pid = 0; | |
495 | nladdr.nl_groups = 0; | |
496 | ||
497 | while (1) { | |
2dd9f8e0 | 498 | int err, len; |
aba5acdf SH |
499 | int l; |
500 | ||
501 | status = fread(&buf, 1, sizeof(*h), rtnl); | |
502 | ||
503 | if (status < 0) { | |
504 | if (errno == EINTR) | |
505 | continue; | |
506 | perror("rtnl_from_file: fread"); | |
507 | return -1; | |
508 | } | |
509 | if (status == 0) | |
510 | return 0; | |
511 | ||
512 | len = h->nlmsg_len; | |
aba5acdf SH |
513 | l = len - sizeof(*h); |
514 | ||
515 | if (l<0 || len>sizeof(buf)) { | |
516 | fprintf(stderr, "!!!malformed message: len=%d @%lu\n", | |
517 | len, ftell(rtnl)); | |
518 | return -1; | |
519 | } | |
520 | ||
521 | status = fread(NLMSG_DATA(h), 1, NLMSG_ALIGN(l), rtnl); | |
522 | ||
523 | if (status < 0) { | |
524 | perror("rtnl_from_file: fread"); | |
525 | return -1; | |
526 | } | |
527 | if (status < l) { | |
528 | fprintf(stderr, "rtnl-from_file: truncated message\n"); | |
529 | return -1; | |
530 | } | |
531 | ||
532 | err = handler(&nladdr, h, jarg); | |
533 | if (err < 0) | |
534 | return err; | |
535 | } | |
536 | } | |
537 | ||
2aa3dd29 SH |
538 | int addattr(struct nlmsghdr *n, int maxlen, int type) |
539 | { | |
540 | return addattr_l(n, maxlen, type, NULL, 0); | |
541 | } | |
542 | ||
543 | int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data) | |
544 | { | |
545 | return addattr_l(n, maxlen, type, &data, sizeof(__u8)); | |
546 | } | |
547 | ||
548 | int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data) | |
549 | { | |
550 | return addattr_l(n, maxlen, type, &data, sizeof(__u16)); | |
551 | } | |
552 | ||
aba5acdf SH |
553 | int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data) |
554 | { | |
2aa3dd29 SH |
555 | return addattr_l(n, maxlen, type, &data, sizeof(__u32)); |
556 | } | |
557 | ||
558 | int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data) | |
559 | { | |
560 | return addattr_l(n, maxlen, type, &data, sizeof(__u64)); | |
561 | } | |
562 | ||
563 | int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *str) | |
564 | { | |
565 | return addattr_l(n, maxlen, type, str, strlen(str)+1); | |
aba5acdf SH |
566 | } |
567 | ||
8ed63ab1 | 568 | int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data, |
6dc9f016 | 569 | int alen) |
aba5acdf SH |
570 | { |
571 | int len = RTA_LENGTH(alen); | |
572 | struct rtattr *rta; | |
573 | ||
3dabdbb3 | 574 | if (NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len) > maxlen) { |
007d3a3e | 575 | fprintf(stderr, "addattr_l ERROR: message exceeded bound of %d\n",maxlen); |
aba5acdf | 576 | return -1; |
007d3a3e | 577 | } |
07f94362 | 578 | rta = NLMSG_TAIL(n); |
aba5acdf SH |
579 | rta->rta_type = type; |
580 | rta->rta_len = len; | |
581 | memcpy(RTA_DATA(rta), data, alen); | |
3dabdbb3 | 582 | n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len); |
aba5acdf SH |
583 | return 0; |
584 | } | |
585 | ||
07f94362 | 586 | int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len) |
587 | { | |
588 | if (NLMSG_ALIGN(n->nlmsg_len) + NLMSG_ALIGN(len) > maxlen) { | |
589 | fprintf(stderr, "addraw_l ERROR: message exceeded bound of %d\n",maxlen); | |
590 | return -1; | |
591 | } | |
592 | ||
593 | memcpy(NLMSG_TAIL(n), data, len); | |
594 | memset((void *) NLMSG_TAIL(n) + len, 0, NLMSG_ALIGN(len) - len); | |
595 | n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + NLMSG_ALIGN(len); | |
596 | return 0; | |
597 | } | |
598 | ||
2f90c9c0 PM |
599 | struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type) |
600 | { | |
601 | struct rtattr *nest = NLMSG_TAIL(n); | |
602 | ||
603 | addattr_l(n, maxlen, type, NULL, 0); | |
604 | return nest; | |
605 | } | |
606 | ||
607 | int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest) | |
608 | { | |
609 | nest->rta_len = (void *)NLMSG_TAIL(n) - (void *)nest; | |
610 | return n->nlmsg_len; | |
611 | } | |
612 | ||
613 | struct rtattr *addattr_nest_compat(struct nlmsghdr *n, int maxlen, int type, | |
614 | const void *data, int len) | |
615 | { | |
616 | struct rtattr *start = NLMSG_TAIL(n); | |
617 | ||
618 | addattr_l(n, maxlen, type, data, len); | |
619 | addattr_nest(n, maxlen, type); | |
620 | return start; | |
621 | } | |
622 | ||
623 | int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *start) | |
624 | { | |
625 | struct rtattr *nest = (void *)start + NLMSG_ALIGN(start->rta_len); | |
626 | ||
627 | start->rta_len = (void *)NLMSG_TAIL(n) - (void *)start; | |
628 | addattr_nest_end(n, nest); | |
629 | return n->nlmsg_len; | |
630 | } | |
631 | ||
aba5acdf SH |
632 | int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data) |
633 | { | |
634 | int len = RTA_LENGTH(4); | |
635 | struct rtattr *subrta; | |
636 | ||
007d3a3e SH |
637 | if (RTA_ALIGN(rta->rta_len) + len > maxlen) { |
638 | fprintf(stderr,"rta_addattr32: Error! max allowed bound %d exceeded\n",maxlen); | |
aba5acdf | 639 | return -1; |
007d3a3e | 640 | } |
aba5acdf SH |
641 | subrta = (struct rtattr*)(((char*)rta) + RTA_ALIGN(rta->rta_len)); |
642 | subrta->rta_type = type; | |
643 | subrta->rta_len = len; | |
644 | memcpy(RTA_DATA(subrta), &data, 4); | |
645 | rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len; | |
646 | return 0; | |
647 | } | |
648 | ||
8ed63ab1 | 649 | int rta_addattr_l(struct rtattr *rta, int maxlen, int type, |
6dc9f016 | 650 | const void *data, int alen) |
aba5acdf SH |
651 | { |
652 | struct rtattr *subrta; | |
653 | int len = RTA_LENGTH(alen); | |
654 | ||
3dabdbb3 | 655 | if (RTA_ALIGN(rta->rta_len) + RTA_ALIGN(len) > maxlen) { |
007d3a3e | 656 | fprintf(stderr,"rta_addattr_l: Error! max allowed bound %d exceeded\n",maxlen); |
aba5acdf | 657 | return -1; |
007d3a3e | 658 | } |
aba5acdf SH |
659 | subrta = (struct rtattr*)(((char*)rta) + RTA_ALIGN(rta->rta_len)); |
660 | subrta->rta_type = type; | |
661 | subrta->rta_len = len; | |
662 | memcpy(RTA_DATA(subrta), data, alen); | |
3dabdbb3 | 663 | rta->rta_len = NLMSG_ALIGN(rta->rta_len) + RTA_ALIGN(len); |
aba5acdf SH |
664 | return 0; |
665 | } | |
666 | ||
aba5acdf SH |
667 | int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len) |
668 | { | |
b1b7ce0f VY |
669 | return parse_rtattr_flags(tb, max, rta, len, 0); |
670 | } | |
671 | ||
672 | int parse_rtattr_flags(struct rtattr *tb[], int max, struct rtattr *rta, | |
673 | int len, unsigned short flags) | |
674 | { | |
675 | unsigned short type; | |
676 | ||
175e2440 | 677 | memset(tb, 0, sizeof(struct rtattr *) * (max + 1)); |
aba5acdf | 678 | while (RTA_OK(rta, len)) { |
b1b7ce0f VY |
679 | type = rta->rta_type & ~flags; |
680 | if ((type <= max) && (!tb[type])) | |
681 | tb[type] = rta; | |
aba5acdf SH |
682 | rta = RTA_NEXT(rta,len); |
683 | } | |
684 | if (len) | |
685 | fprintf(stderr, "!!!Deficit %d, rta_len=%d\n", len, rta->rta_len); | |
686 | return 0; | |
687 | } | |
c7699875 | 688 | |
689 | int parse_rtattr_byindex(struct rtattr *tb[], int max, struct rtattr *rta, int len) | |
690 | { | |
691 | int i = 0; | |
175e2440 SH |
692 | |
693 | memset(tb, 0, sizeof(struct rtattr *) * max); | |
c7699875 | 694 | while (RTA_OK(rta, len)) { |
175e2440 | 695 | if (rta->rta_type <= max && i < max) |
c7699875 | 696 | tb[i++] = rta; |
697 | rta = RTA_NEXT(rta,len); | |
698 | } | |
699 | if (len) | |
700 | fprintf(stderr, "!!!Deficit %d, rta_len=%d\n", len, rta->rta_len); | |
701 | return i; | |
702 | } | |
2f90c9c0 PM |
703 | |
704 | int __parse_rtattr_nested_compat(struct rtattr *tb[], int max, struct rtattr *rta, | |
705 | int len) | |
706 | { | |
707 | if (RTA_PAYLOAD(rta) < len) | |
708 | return -1; | |
709 | if (RTA_PAYLOAD(rta) >= RTA_ALIGN(len) + sizeof(struct rtattr)) { | |
710 | rta = RTA_DATA(rta) + RTA_ALIGN(len); | |
711 | return parse_rtattr_nested(tb, max, rta); | |
712 | } | |
037c635e | 713 | memset(tb, 0, sizeof(struct rtattr *) * (max + 1)); |
2f90c9c0 PM |
714 | return 0; |
715 | } |