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