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