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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ | |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Tom Gundersen <teg@jklm.no> | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <netinet/in.h> | |
23 | #include <stdbool.h> | |
24 | #include <unistd.h> | |
25 | ||
26 | #include "util.h" | |
27 | #include "formats-util.h" | |
28 | #include "refcnt.h" | |
29 | #include "missing.h" | |
30 | ||
31 | #include "sd-rtnl.h" | |
32 | #include "rtnl-util.h" | |
33 | #include "rtnl-internal.h" | |
34 | #include "rtnl-types.h" | |
35 | ||
36 | #define GET_CONTAINER(m, i) ((i) < (m)->n_containers ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->container_offsets[i]) : NULL) | |
37 | #define PUSH_CONTAINER(m, new) (m)->container_offsets[(m)->n_containers ++] = (uint8_t*)(new) - (uint8_t*)(m)->hdr; | |
38 | ||
39 | #define RTA_TYPE(rta) ((rta)->rta_type & NLA_TYPE_MASK) | |
40 | ||
41 | static int message_new_empty(sd_rtnl *rtnl, sd_rtnl_message **ret) { | |
42 | sd_rtnl_message *m; | |
43 | ||
44 | assert_return(ret, -EINVAL); | |
45 | ||
46 | /* Note that 'rtnl' is currently unused, if we start using it internally | |
47 | we must take care to avoid problems due to mutual references between | |
48 | buses and their queued messages. See sd-bus. | |
49 | */ | |
50 | ||
51 | m = new0(sd_rtnl_message, 1); | |
52 | if (!m) | |
53 | return -ENOMEM; | |
54 | ||
55 | m->n_ref = REFCNT_INIT; | |
56 | ||
57 | m->sealed = false; | |
58 | ||
59 | *ret = m; | |
60 | ||
61 | return 0; | |
62 | } | |
63 | ||
64 | int message_new(sd_rtnl *rtnl, sd_rtnl_message **ret, uint16_t type) { | |
65 | _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL; | |
66 | const NLType *nl_type; | |
67 | size_t size; | |
68 | int r; | |
69 | ||
70 | r = type_system_get_type(NULL, &nl_type, type); | |
71 | if (r < 0) | |
72 | return r; | |
73 | ||
74 | r = message_new_empty(rtnl, &m); | |
75 | if (r < 0) | |
76 | return r; | |
77 | ||
78 | size = NLMSG_SPACE(nl_type->size); | |
79 | ||
80 | assert(size >= sizeof(struct nlmsghdr)); | |
81 | m->hdr = malloc0(size); | |
82 | if (!m->hdr) | |
83 | return -ENOMEM; | |
84 | ||
85 | m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; | |
86 | ||
87 | m->container_type_system[0] = nl_type->type_system; | |
88 | m->hdr->nlmsg_len = size; | |
89 | m->hdr->nlmsg_type = type; | |
90 | ||
91 | *ret = m; | |
92 | m = NULL; | |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
97 | int sd_rtnl_message_route_set_dst_prefixlen(sd_rtnl_message *m, unsigned char prefixlen) { | |
98 | struct rtmsg *rtm; | |
99 | ||
100 | assert_return(m, -EINVAL); | |
101 | assert_return(m->hdr, -EINVAL); | |
102 | assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); | |
103 | ||
104 | rtm = NLMSG_DATA(m->hdr); | |
105 | ||
106 | if ((rtm->rtm_family == AF_INET && prefixlen > 32) || | |
107 | (rtm->rtm_family == AF_INET6 && prefixlen > 128)) | |
108 | return -ERANGE; | |
109 | ||
110 | rtm->rtm_dst_len = prefixlen; | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | int sd_rtnl_message_route_set_src_prefixlen(sd_rtnl_message *m, unsigned char prefixlen) { | |
116 | struct rtmsg *rtm; | |
117 | ||
118 | assert_return(m, -EINVAL); | |
119 | assert_return(m->hdr, -EINVAL); | |
120 | assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); | |
121 | ||
122 | rtm = NLMSG_DATA(m->hdr); | |
123 | ||
124 | if ((rtm->rtm_family == AF_INET && prefixlen > 32) || | |
125 | (rtm->rtm_family == AF_INET6 && prefixlen > 128)) | |
126 | return -ERANGE; | |
127 | ||
128 | rtm->rtm_src_len = prefixlen; | |
129 | ||
130 | return 0; | |
131 | } | |
132 | ||
133 | int sd_rtnl_message_route_set_scope(sd_rtnl_message *m, unsigned char scope) { | |
134 | struct rtmsg *rtm; | |
135 | ||
136 | assert_return(m, -EINVAL); | |
137 | assert_return(m->hdr, -EINVAL); | |
138 | assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); | |
139 | ||
140 | rtm = NLMSG_DATA(m->hdr); | |
141 | ||
142 | rtm->rtm_scope = scope; | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
147 | int sd_rtnl_message_route_get_family(sd_rtnl_message *m, int *family) { | |
148 | struct rtmsg *rtm; | |
149 | ||
150 | assert_return(m, -EINVAL); | |
151 | assert_return(m->hdr, -EINVAL); | |
152 | assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); | |
153 | assert_return(family, -EINVAL); | |
154 | ||
155 | rtm = NLMSG_DATA(m->hdr); | |
156 | ||
157 | *family = rtm->rtm_family; | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
162 | int sd_rtnl_message_route_get_dst_prefixlen(sd_rtnl_message *m, unsigned char *dst_len) { | |
163 | struct rtmsg *rtm; | |
164 | ||
165 | assert_return(m, -EINVAL); | |
166 | assert_return(m->hdr, -EINVAL); | |
167 | assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); | |
168 | assert_return(dst_len, -EINVAL); | |
169 | ||
170 | rtm = NLMSG_DATA(m->hdr); | |
171 | ||
172 | *dst_len = rtm->rtm_dst_len; | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
177 | int sd_rtnl_message_route_get_src_prefixlen(sd_rtnl_message *m, unsigned char *src_len) { | |
178 | struct rtmsg *rtm; | |
179 | ||
180 | assert_return(m, -EINVAL); | |
181 | assert_return(m->hdr, -EINVAL); | |
182 | assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); | |
183 | assert_return(src_len, -EINVAL); | |
184 | ||
185 | rtm = NLMSG_DATA(m->hdr); | |
186 | ||
187 | *src_len = rtm->rtm_src_len; | |
188 | ||
189 | return 0; | |
190 | } | |
191 | ||
192 | int sd_rtnl_message_new_route(sd_rtnl *rtnl, sd_rtnl_message **ret, | |
193 | uint16_t nlmsg_type, int rtm_family, | |
194 | unsigned char rtm_protocol) { | |
195 | struct rtmsg *rtm; | |
196 | int r; | |
197 | ||
198 | assert_return(rtnl_message_type_is_route(nlmsg_type), -EINVAL); | |
199 | assert_return((nlmsg_type == RTM_GETROUTE && rtm_family == AF_UNSPEC) || | |
200 | rtm_family == AF_INET || rtm_family == AF_INET6, -EINVAL); | |
201 | assert_return(ret, -EINVAL); | |
202 | ||
203 | r = message_new(rtnl, ret, nlmsg_type); | |
204 | if (r < 0) | |
205 | return r; | |
206 | ||
207 | if (nlmsg_type == RTM_NEWROUTE) | |
208 | (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_APPEND; | |
209 | ||
210 | rtm = NLMSG_DATA((*ret)->hdr); | |
211 | ||
212 | rtm->rtm_family = rtm_family; | |
213 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
214 | rtm->rtm_type = RTN_UNICAST; | |
215 | rtm->rtm_table = RT_TABLE_MAIN; | |
216 | rtm->rtm_protocol = rtm_protocol; | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | int sd_rtnl_message_neigh_set_flags(sd_rtnl_message *m, uint8_t flags) { | |
222 | struct ndmsg *ndm; | |
223 | ||
224 | assert_return(m, -EINVAL); | |
225 | assert_return(m->hdr, -EINVAL); | |
226 | assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); | |
227 | ||
228 | ndm = NLMSG_DATA(m->hdr); | |
229 | ndm->ndm_flags |= flags; | |
230 | ||
231 | return 0; | |
232 | } | |
233 | ||
234 | int sd_rtnl_message_neigh_set_state(sd_rtnl_message *m, uint16_t state) { | |
235 | struct ndmsg *ndm; | |
236 | ||
237 | assert_return(m, -EINVAL); | |
238 | assert_return(m->hdr, -EINVAL); | |
239 | assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); | |
240 | ||
241 | ndm = NLMSG_DATA(m->hdr); | |
242 | ndm->ndm_state |= state; | |
243 | ||
244 | return 0; | |
245 | } | |
246 | ||
247 | int sd_rtnl_message_neigh_get_flags(sd_rtnl_message *m, uint8_t *flags) { | |
248 | struct ndmsg *ndm; | |
249 | ||
250 | assert_return(m, -EINVAL); | |
251 | assert_return(m->hdr, -EINVAL); | |
252 | assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); | |
253 | ||
254 | ndm = NLMSG_DATA(m->hdr); | |
255 | *flags = ndm->ndm_flags; | |
256 | ||
257 | return 0; | |
258 | } | |
259 | ||
260 | int sd_rtnl_message_neigh_get_state(sd_rtnl_message *m, uint16_t *state) { | |
261 | struct ndmsg *ndm; | |
262 | ||
263 | assert_return(m, -EINVAL); | |
264 | assert_return(m->hdr, -EINVAL); | |
265 | assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); | |
266 | ||
267 | ndm = NLMSG_DATA(m->hdr); | |
268 | *state = ndm->ndm_state; | |
269 | ||
270 | return 0; | |
271 | } | |
272 | ||
273 | int sd_rtnl_message_neigh_get_family(sd_rtnl_message *m, int *family) { | |
274 | struct ndmsg *ndm; | |
275 | ||
276 | assert_return(m, -EINVAL); | |
277 | assert_return(m->hdr, -EINVAL); | |
278 | assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); | |
279 | assert_return(family, -EINVAL); | |
280 | ||
281 | ndm = NLMSG_DATA(m->hdr); | |
282 | ||
283 | *family = ndm->ndm_family; | |
284 | ||
285 | return 0; | |
286 | } | |
287 | ||
288 | int sd_rtnl_message_neigh_get_ifindex(sd_rtnl_message *m, int *index) { | |
289 | struct ndmsg *ndm; | |
290 | ||
291 | assert_return(m, -EINVAL); | |
292 | assert_return(m->hdr, -EINVAL); | |
293 | assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); | |
294 | assert_return(index, -EINVAL); | |
295 | ||
296 | ndm = NLMSG_DATA(m->hdr); | |
297 | ||
298 | *index = ndm->ndm_ifindex; | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
303 | int sd_rtnl_message_new_neigh(sd_rtnl *rtnl, sd_rtnl_message **ret, uint16_t nlmsg_type, int index, int ndm_family) { | |
304 | struct ndmsg *ndm; | |
305 | int r; | |
306 | ||
307 | assert_return(rtnl_message_type_is_neigh(nlmsg_type), -EINVAL); | |
308 | assert_return(ndm_family == AF_INET || | |
309 | ndm_family == AF_INET6 || | |
310 | ndm_family == PF_BRIDGE, -EINVAL); | |
311 | assert_return(ret, -EINVAL); | |
312 | ||
313 | r = message_new(rtnl, ret, nlmsg_type); | |
314 | if (r < 0) | |
315 | return r; | |
316 | ||
317 | if (nlmsg_type == RTM_NEWNEIGH) | |
318 | (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_APPEND; | |
319 | ||
320 | ndm = NLMSG_DATA((*ret)->hdr); | |
321 | ||
322 | ndm->ndm_family = ndm_family; | |
323 | ndm->ndm_ifindex = index; | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
328 | int sd_rtnl_message_link_set_flags(sd_rtnl_message *m, unsigned flags, unsigned change) { | |
329 | struct ifinfomsg *ifi; | |
330 | ||
331 | assert_return(m, -EINVAL); | |
332 | assert_return(m->hdr, -EINVAL); | |
333 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); | |
334 | assert_return(change, -EINVAL); | |
335 | ||
336 | ifi = NLMSG_DATA(m->hdr); | |
337 | ||
338 | ifi->ifi_flags = flags; | |
339 | ifi->ifi_change = change; | |
340 | ||
341 | return 0; | |
342 | } | |
343 | ||
344 | int sd_rtnl_message_link_set_type(sd_rtnl_message *m, unsigned type) { | |
345 | struct ifinfomsg *ifi; | |
346 | ||
347 | assert_return(m, -EINVAL); | |
348 | assert_return(m->hdr, -EINVAL); | |
349 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); | |
350 | ||
351 | ifi = NLMSG_DATA(m->hdr); | |
352 | ||
353 | ifi->ifi_type = type; | |
354 | ||
355 | return 0; | |
356 | } | |
357 | ||
358 | int sd_rtnl_message_link_set_family(sd_rtnl_message *m, unsigned family) { | |
359 | struct ifinfomsg *ifi; | |
360 | ||
361 | assert_return(m, -EINVAL); | |
362 | assert_return(m->hdr, -EINVAL); | |
363 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); | |
364 | ||
365 | ifi = NLMSG_DATA(m->hdr); | |
366 | ||
367 | ifi->ifi_family = family; | |
368 | ||
369 | return 0; | |
370 | } | |
371 | ||
372 | int sd_rtnl_message_new_link(sd_rtnl *rtnl, sd_rtnl_message **ret, | |
373 | uint16_t nlmsg_type, int index) { | |
374 | struct ifinfomsg *ifi; | |
375 | int r; | |
376 | ||
377 | assert_return(rtnl_message_type_is_link(nlmsg_type), -EINVAL); | |
378 | assert_return(nlmsg_type != RTM_DELLINK || index > 0, -EINVAL); | |
379 | assert_return(ret, -EINVAL); | |
380 | ||
381 | r = message_new(rtnl, ret, nlmsg_type); | |
382 | if (r < 0) | |
383 | return r; | |
384 | ||
385 | if (nlmsg_type == RTM_NEWLINK) | |
386 | (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL; | |
387 | ||
388 | ifi = NLMSG_DATA((*ret)->hdr); | |
389 | ||
390 | ifi->ifi_family = AF_UNSPEC; | |
391 | ifi->ifi_index = index; | |
392 | ||
393 | return 0; | |
394 | } | |
395 | ||
396 | int sd_rtnl_message_request_dump(sd_rtnl_message *m, int dump) { | |
397 | assert_return(m, -EINVAL); | |
398 | assert_return(m->hdr, -EINVAL); | |
399 | assert_return(m->hdr->nlmsg_type == RTM_GETLINK || | |
400 | m->hdr->nlmsg_type == RTM_GETADDR || | |
401 | m->hdr->nlmsg_type == RTM_GETROUTE || | |
402 | m->hdr->nlmsg_type == RTM_GETNEIGH, | |
403 | -EINVAL); | |
404 | ||
405 | if (dump) | |
406 | m->hdr->nlmsg_flags |= NLM_F_DUMP; | |
407 | else | |
408 | m->hdr->nlmsg_flags &= ~NLM_F_DUMP; | |
409 | ||
410 | return 0; | |
411 | } | |
412 | ||
413 | int sd_rtnl_message_addr_set_prefixlen(sd_rtnl_message *m, unsigned char prefixlen) { | |
414 | struct ifaddrmsg *ifa; | |
415 | ||
416 | assert_return(m, -EINVAL); | |
417 | assert_return(m->hdr, -EINVAL); | |
418 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
419 | ||
420 | ifa = NLMSG_DATA(m->hdr); | |
421 | ||
422 | if ((ifa->ifa_family == AF_INET && prefixlen > 32) || | |
423 | (ifa->ifa_family == AF_INET6 && prefixlen > 128)) | |
424 | return -ERANGE; | |
425 | ||
426 | ifa->ifa_prefixlen = prefixlen; | |
427 | ||
428 | return 0; | |
429 | } | |
430 | ||
431 | int sd_rtnl_message_addr_set_flags(sd_rtnl_message *m, unsigned char flags) { | |
432 | struct ifaddrmsg *ifa; | |
433 | ||
434 | assert_return(m, -EINVAL); | |
435 | assert_return(m->hdr, -EINVAL); | |
436 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
437 | ||
438 | ifa = NLMSG_DATA(m->hdr); | |
439 | ||
440 | ifa->ifa_flags = flags; | |
441 | ||
442 | return 0; | |
443 | } | |
444 | ||
445 | int sd_rtnl_message_addr_set_scope(sd_rtnl_message *m, unsigned char scope) { | |
446 | struct ifaddrmsg *ifa; | |
447 | ||
448 | assert_return(m, -EINVAL); | |
449 | assert_return(m->hdr, -EINVAL); | |
450 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
451 | ||
452 | ifa = NLMSG_DATA(m->hdr); | |
453 | ||
454 | ifa->ifa_scope = scope; | |
455 | ||
456 | return 0; | |
457 | } | |
458 | ||
459 | int sd_rtnl_message_addr_get_family(sd_rtnl_message *m, int *family) { | |
460 | struct ifaddrmsg *ifa; | |
461 | ||
462 | assert_return(m, -EINVAL); | |
463 | assert_return(m->hdr, -EINVAL); | |
464 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
465 | assert_return(family, -EINVAL); | |
466 | ||
467 | ifa = NLMSG_DATA(m->hdr); | |
468 | ||
469 | *family = ifa->ifa_family; | |
470 | ||
471 | return 0; | |
472 | } | |
473 | ||
474 | int sd_rtnl_message_addr_get_prefixlen(sd_rtnl_message *m, unsigned char *prefixlen) { | |
475 | struct ifaddrmsg *ifa; | |
476 | ||
477 | assert_return(m, -EINVAL); | |
478 | assert_return(m->hdr, -EINVAL); | |
479 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
480 | assert_return(prefixlen, -EINVAL); | |
481 | ||
482 | ifa = NLMSG_DATA(m->hdr); | |
483 | ||
484 | *prefixlen = ifa->ifa_prefixlen; | |
485 | ||
486 | return 0; | |
487 | } | |
488 | ||
489 | int sd_rtnl_message_addr_get_scope(sd_rtnl_message *m, unsigned char *scope) { | |
490 | struct ifaddrmsg *ifa; | |
491 | ||
492 | assert_return(m, -EINVAL); | |
493 | assert_return(m->hdr, -EINVAL); | |
494 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
495 | assert_return(scope, -EINVAL); | |
496 | ||
497 | ifa = NLMSG_DATA(m->hdr); | |
498 | ||
499 | *scope = ifa->ifa_scope; | |
500 | ||
501 | return 0; | |
502 | } | |
503 | ||
504 | int sd_rtnl_message_addr_get_flags(sd_rtnl_message *m, unsigned char *flags) { | |
505 | struct ifaddrmsg *ifa; | |
506 | ||
507 | assert_return(m, -EINVAL); | |
508 | assert_return(m->hdr, -EINVAL); | |
509 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
510 | assert_return(flags, -EINVAL); | |
511 | ||
512 | ifa = NLMSG_DATA(m->hdr); | |
513 | ||
514 | *flags = ifa->ifa_flags; | |
515 | ||
516 | return 0; | |
517 | } | |
518 | ||
519 | int sd_rtnl_message_addr_get_ifindex(sd_rtnl_message *m, int *ifindex) { | |
520 | struct ifaddrmsg *ifa; | |
521 | ||
522 | assert_return(m, -EINVAL); | |
523 | assert_return(m->hdr, -EINVAL); | |
524 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
525 | assert_return(ifindex, -EINVAL); | |
526 | ||
527 | ifa = NLMSG_DATA(m->hdr); | |
528 | ||
529 | *ifindex = ifa->ifa_index; | |
530 | ||
531 | return 0; | |
532 | } | |
533 | ||
534 | int sd_rtnl_message_new_addr(sd_rtnl *rtnl, sd_rtnl_message **ret, | |
535 | uint16_t nlmsg_type, int index, | |
536 | int family) { | |
537 | struct ifaddrmsg *ifa; | |
538 | int r; | |
539 | ||
540 | assert_return(rtnl_message_type_is_addr(nlmsg_type), -EINVAL); | |
541 | assert_return((nlmsg_type == RTM_GETADDR && index == 0) || | |
542 | index > 0, -EINVAL); | |
543 | assert_return((nlmsg_type == RTM_GETADDR && family == AF_UNSPEC) || | |
544 | family == AF_INET || family == AF_INET6, -EINVAL); | |
545 | assert_return(ret, -EINVAL); | |
546 | ||
547 | r = message_new(rtnl, ret, nlmsg_type); | |
548 | if (r < 0) | |
549 | return r; | |
550 | ||
551 | if (nlmsg_type == RTM_GETADDR) | |
552 | (*ret)->hdr->nlmsg_flags |= NLM_F_DUMP; | |
553 | ||
554 | ifa = NLMSG_DATA((*ret)->hdr); | |
555 | ||
556 | ifa->ifa_index = index; | |
557 | ifa->ifa_family = family; | |
558 | if (family == AF_INET) | |
559 | ifa->ifa_prefixlen = 32; | |
560 | else if (family == AF_INET6) | |
561 | ifa->ifa_prefixlen = 128; | |
562 | ||
563 | return 0; | |
564 | } | |
565 | ||
566 | int sd_rtnl_message_new_addr_update(sd_rtnl *rtnl, sd_rtnl_message **ret, | |
567 | int index, int family) { | |
568 | int r; | |
569 | ||
570 | r = sd_rtnl_message_new_addr(rtnl, ret, RTM_NEWADDR, index, family); | |
571 | if (r < 0) | |
572 | return r; | |
573 | ||
574 | (*ret)->hdr->nlmsg_flags |= NLM_F_REPLACE; | |
575 | ||
576 | return 0; | |
577 | } | |
578 | ||
579 | sd_rtnl_message *sd_rtnl_message_ref(sd_rtnl_message *m) { | |
580 | if (m) | |
581 | assert_se(REFCNT_INC(m->n_ref) >= 2); | |
582 | ||
583 | return m; | |
584 | } | |
585 | ||
586 | sd_rtnl_message *sd_rtnl_message_unref(sd_rtnl_message *m) { | |
587 | if (m && REFCNT_DEC(m->n_ref) == 0) { | |
588 | unsigned i; | |
589 | ||
590 | free(m->hdr); | |
591 | ||
592 | for (i = 0; i <= m->n_containers; i++) | |
593 | free(m->rta_offset_tb[i]); | |
594 | ||
595 | sd_rtnl_message_unref(m->next); | |
596 | ||
597 | free(m); | |
598 | } | |
599 | ||
600 | return NULL; | |
601 | } | |
602 | ||
603 | int sd_rtnl_message_get_type(sd_rtnl_message *m, uint16_t *type) { | |
604 | assert_return(m, -EINVAL); | |
605 | assert_return(type, -EINVAL); | |
606 | ||
607 | *type = m->hdr->nlmsg_type; | |
608 | ||
609 | return 0; | |
610 | } | |
611 | ||
612 | int sd_rtnl_message_get_family(sd_rtnl_message *m, int *family) { | |
613 | assert_return(m, -EINVAL); | |
614 | assert_return(family, -EINVAL); | |
615 | ||
616 | assert(m->hdr); | |
617 | ||
618 | if (rtnl_message_type_is_link(m->hdr->nlmsg_type)) { | |
619 | struct ifinfomsg *ifi; | |
620 | ||
621 | ifi = NLMSG_DATA(m->hdr); | |
622 | ||
623 | *family = ifi->ifi_family; | |
624 | ||
625 | return 0; | |
626 | } else if (rtnl_message_type_is_route(m->hdr->nlmsg_type)) { | |
627 | struct rtmsg *rtm; | |
628 | ||
629 | rtm = NLMSG_DATA(m->hdr); | |
630 | ||
631 | *family = rtm->rtm_family; | |
632 | ||
633 | return 0; | |
634 | } else if (rtnl_message_type_is_neigh(m->hdr->nlmsg_type)) { | |
635 | struct ndmsg *ndm; | |
636 | ||
637 | ndm = NLMSG_DATA(m->hdr); | |
638 | ||
639 | *family = ndm->ndm_family; | |
640 | ||
641 | return 0; | |
642 | } else if (rtnl_message_type_is_addr(m->hdr->nlmsg_type)) { | |
643 | struct ifaddrmsg *ifa; | |
644 | ||
645 | ifa = NLMSG_DATA(m->hdr); | |
646 | ||
647 | *family = ifa->ifa_family; | |
648 | ||
649 | return 0; | |
650 | } | |
651 | ||
652 | return -EOPNOTSUPP; | |
653 | } | |
654 | ||
655 | int sd_rtnl_message_is_broadcast(sd_rtnl_message *m) { | |
656 | assert_return(m, -EINVAL); | |
657 | ||
658 | return m->broadcast; | |
659 | } | |
660 | ||
661 | int sd_rtnl_message_link_get_ifindex(sd_rtnl_message *m, int *ifindex) { | |
662 | struct ifinfomsg *ifi; | |
663 | ||
664 | assert_return(m, -EINVAL); | |
665 | assert_return(m->hdr, -EINVAL); | |
666 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); | |
667 | assert_return(ifindex, -EINVAL); | |
668 | ||
669 | ifi = NLMSG_DATA(m->hdr); | |
670 | ||
671 | *ifindex = ifi->ifi_index; | |
672 | ||
673 | return 0; | |
674 | } | |
675 | ||
676 | int sd_rtnl_message_link_get_flags(sd_rtnl_message *m, unsigned *flags) { | |
677 | struct ifinfomsg *ifi; | |
678 | ||
679 | assert_return(m, -EINVAL); | |
680 | assert_return(m->hdr, -EINVAL); | |
681 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); | |
682 | assert_return(flags, -EINVAL); | |
683 | ||
684 | ifi = NLMSG_DATA(m->hdr); | |
685 | ||
686 | *flags = ifi->ifi_flags; | |
687 | ||
688 | return 0; | |
689 | } | |
690 | ||
691 | int sd_rtnl_message_link_get_type(sd_rtnl_message *m, unsigned *type) { | |
692 | struct ifinfomsg *ifi; | |
693 | ||
694 | assert_return(m, -EINVAL); | |
695 | assert_return(m->hdr, -EINVAL); | |
696 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); | |
697 | assert_return(type, -EINVAL); | |
698 | ||
699 | ifi = NLMSG_DATA(m->hdr); | |
700 | ||
701 | *type = ifi->ifi_type; | |
702 | ||
703 | return 0; | |
704 | } | |
705 | ||
706 | /* If successful the updated message will be correctly aligned, if | |
707 | unsuccessful the old message is untouched. */ | |
708 | static int add_rtattr(sd_rtnl_message *m, unsigned short type, const void *data, size_t data_length) { | |
709 | uint32_t rta_length; | |
710 | size_t message_length, padding_length; | |
711 | struct nlmsghdr *new_hdr; | |
712 | struct rtattr *rta; | |
713 | char *padding; | |
714 | unsigned i; | |
715 | int offset; | |
716 | ||
717 | assert(m); | |
718 | assert(m->hdr); | |
719 | assert(!m->sealed); | |
720 | assert(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len); | |
721 | assert(!data || data_length); | |
722 | ||
723 | /* get offset of the new attribute */ | |
724 | offset = m->hdr->nlmsg_len; | |
725 | ||
726 | /* get the size of the new rta attribute (with padding at the end) */ | |
727 | rta_length = RTA_LENGTH(data_length); | |
728 | ||
729 | /* get the new message size (with padding at the end) */ | |
730 | message_length = offset + RTA_ALIGN(rta_length); | |
731 | ||
732 | /* realloc to fit the new attribute */ | |
733 | new_hdr = realloc(m->hdr, message_length); | |
734 | if (!new_hdr) | |
735 | return -ENOMEM; | |
736 | m->hdr = new_hdr; | |
737 | ||
738 | /* get pointer to the attribute we are about to add */ | |
739 | rta = (struct rtattr *) ((uint8_t *) m->hdr + offset); | |
740 | ||
741 | /* if we are inside containers, extend them */ | |
742 | for (i = 0; i < m->n_containers; i++) | |
743 | GET_CONTAINER(m, i)->rta_len += message_length - offset; | |
744 | ||
745 | /* fill in the attribute */ | |
746 | rta->rta_type = type; | |
747 | rta->rta_len = rta_length; | |
748 | if (data) | |
749 | /* we don't deal with the case where the user lies about the type | |
750 | * and gives us too little data (so don't do that) | |
751 | */ | |
752 | padding = mempcpy(RTA_DATA(rta), data, data_length); | |
753 | else { | |
754 | /* if no data was passed, make sure we still initialize the padding | |
755 | note that we can have data_length > 0 (used by some containers) */ | |
756 | padding = RTA_DATA(rta); | |
757 | } | |
758 | ||
759 | /* make sure also the padding at the end of the message is initialized */ | |
760 | padding_length = (uint8_t*)m->hdr + message_length - (uint8_t*)padding; | |
761 | memzero(padding, padding_length); | |
762 | ||
763 | /* update message size */ | |
764 | m->hdr->nlmsg_len = message_length; | |
765 | ||
766 | return offset; | |
767 | } | |
768 | ||
769 | static int message_attribute_has_type(sd_rtnl_message *m, uint16_t attribute_type, uint16_t data_type) { | |
770 | const NLType *type; | |
771 | int r; | |
772 | ||
773 | r = type_system_get_type(m->container_type_system[m->n_containers], &type, attribute_type); | |
774 | if (r < 0) | |
775 | return r; | |
776 | ||
777 | if (type->type != data_type) | |
778 | return -EINVAL; | |
779 | ||
780 | return type->size; | |
781 | } | |
782 | ||
783 | int sd_rtnl_message_append_string(sd_rtnl_message *m, unsigned short type, const char *data) { | |
784 | size_t length, size; | |
785 | int r; | |
786 | ||
787 | assert_return(m, -EINVAL); | |
788 | assert_return(!m->sealed, -EPERM); | |
789 | assert_return(data, -EINVAL); | |
790 | ||
791 | r = message_attribute_has_type(m, type, NLA_STRING); | |
792 | if (r < 0) | |
793 | return r; | |
794 | else | |
795 | size = (size_t)r; | |
796 | ||
797 | if (size) { | |
798 | length = strnlen(data, size+1); | |
799 | if (length > size) | |
800 | return -EINVAL; | |
801 | } else | |
802 | length = strlen(data); | |
803 | ||
804 | r = add_rtattr(m, type, data, length + 1); | |
805 | if (r < 0) | |
806 | return r; | |
807 | ||
808 | return 0; | |
809 | } | |
810 | ||
811 | int sd_rtnl_message_append_u8(sd_rtnl_message *m, unsigned short type, uint8_t data) { | |
812 | int r; | |
813 | ||
814 | assert_return(m, -EINVAL); | |
815 | assert_return(!m->sealed, -EPERM); | |
816 | ||
817 | r = message_attribute_has_type(m, type, NLA_U8); | |
818 | if (r < 0) | |
819 | return r; | |
820 | ||
821 | r = add_rtattr(m, type, &data, sizeof(uint8_t)); | |
822 | if (r < 0) | |
823 | return r; | |
824 | ||
825 | return 0; | |
826 | } | |
827 | ||
828 | ||
829 | int sd_rtnl_message_append_u16(sd_rtnl_message *m, unsigned short type, uint16_t data) { | |
830 | int r; | |
831 | ||
832 | assert_return(m, -EINVAL); | |
833 | assert_return(!m->sealed, -EPERM); | |
834 | ||
835 | r = message_attribute_has_type(m, type, NLA_U16); | |
836 | if (r < 0) | |
837 | return r; | |
838 | ||
839 | r = add_rtattr(m, type, &data, sizeof(uint16_t)); | |
840 | if (r < 0) | |
841 | return r; | |
842 | ||
843 | return 0; | |
844 | } | |
845 | ||
846 | int sd_rtnl_message_append_u32(sd_rtnl_message *m, unsigned short type, uint32_t data) { | |
847 | int r; | |
848 | ||
849 | assert_return(m, -EINVAL); | |
850 | assert_return(!m->sealed, -EPERM); | |
851 | ||
852 | r = message_attribute_has_type(m, type, NLA_U32); | |
853 | if (r < 0) | |
854 | return r; | |
855 | ||
856 | r = add_rtattr(m, type, &data, sizeof(uint32_t)); | |
857 | if (r < 0) | |
858 | return r; | |
859 | ||
860 | return 0; | |
861 | } | |
862 | ||
863 | int sd_rtnl_message_append_in_addr(sd_rtnl_message *m, unsigned short type, const struct in_addr *data) { | |
864 | int r; | |
865 | ||
866 | assert_return(m, -EINVAL); | |
867 | assert_return(!m->sealed, -EPERM); | |
868 | assert_return(data, -EINVAL); | |
869 | ||
870 | r = message_attribute_has_type(m, type, NLA_IN_ADDR); | |
871 | if (r < 0) | |
872 | return r; | |
873 | ||
874 | r = add_rtattr(m, type, data, sizeof(struct in_addr)); | |
875 | if (r < 0) | |
876 | return r; | |
877 | ||
878 | return 0; | |
879 | } | |
880 | ||
881 | int sd_rtnl_message_append_in6_addr(sd_rtnl_message *m, unsigned short type, const struct in6_addr *data) { | |
882 | int r; | |
883 | ||
884 | assert_return(m, -EINVAL); | |
885 | assert_return(!m->sealed, -EPERM); | |
886 | assert_return(data, -EINVAL); | |
887 | ||
888 | r = message_attribute_has_type(m, type, NLA_IN_ADDR); | |
889 | if (r < 0) | |
890 | return r; | |
891 | ||
892 | r = add_rtattr(m, type, data, sizeof(struct in6_addr)); | |
893 | if (r < 0) | |
894 | return r; | |
895 | ||
896 | return 0; | |
897 | } | |
898 | ||
899 | int sd_rtnl_message_append_ether_addr(sd_rtnl_message *m, unsigned short type, const struct ether_addr *data) { | |
900 | int r; | |
901 | ||
902 | assert_return(m, -EINVAL); | |
903 | assert_return(!m->sealed, -EPERM); | |
904 | assert_return(data, -EINVAL); | |
905 | ||
906 | r = message_attribute_has_type(m, type, NLA_ETHER_ADDR); | |
907 | if (r < 0) | |
908 | return r; | |
909 | ||
910 | r = add_rtattr(m, type, data, ETH_ALEN); | |
911 | if (r < 0) | |
912 | return r; | |
913 | ||
914 | return 0; | |
915 | } | |
916 | ||
917 | int sd_rtnl_message_append_cache_info(sd_rtnl_message *m, unsigned short type, const struct ifa_cacheinfo *info) { | |
918 | int r; | |
919 | ||
920 | assert_return(m, -EINVAL); | |
921 | assert_return(!m->sealed, -EPERM); | |
922 | assert_return(info, -EINVAL); | |
923 | ||
924 | r = message_attribute_has_type(m, type, NLA_CACHE_INFO); | |
925 | if (r < 0) | |
926 | return r; | |
927 | ||
928 | r = add_rtattr(m, type, info, sizeof(struct ifa_cacheinfo)); | |
929 | if (r < 0) | |
930 | return r; | |
931 | ||
932 | return 0; | |
933 | } | |
934 | ||
935 | int sd_rtnl_message_open_container(sd_rtnl_message *m, unsigned short type) { | |
936 | size_t size; | |
937 | int r; | |
938 | ||
939 | assert_return(m, -EINVAL); | |
940 | assert_return(!m->sealed, -EPERM); | |
941 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -ERANGE); | |
942 | ||
943 | r = message_attribute_has_type(m, type, NLA_NESTED); | |
944 | if (r < 0) { | |
945 | const NLTypeSystemUnion *type_system_union; | |
946 | int family; | |
947 | ||
948 | r = message_attribute_has_type(m, type, NLA_UNION); | |
949 | if (r < 0) | |
950 | return r; | |
951 | size = (size_t) r; | |
952 | ||
953 | r = sd_rtnl_message_get_family(m, &family); | |
954 | if (r < 0) | |
955 | return r; | |
956 | ||
957 | r = type_system_get_type_system_union(m->container_type_system[m->n_containers], &type_system_union, type); | |
958 | if (r < 0) | |
959 | return r; | |
960 | ||
961 | r = type_system_union_protocol_get_type_system(type_system_union, | |
962 | &m->container_type_system[m->n_containers + 1], | |
963 | family); | |
964 | if (r < 0) | |
965 | return r; | |
966 | } else { | |
967 | size = (size_t)r; | |
968 | ||
969 | r = type_system_get_type_system(m->container_type_system[m->n_containers], | |
970 | &m->container_type_system[m->n_containers + 1], | |
971 | type); | |
972 | if (r < 0) | |
973 | return r; | |
974 | } | |
975 | ||
976 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, size); | |
977 | if (r < 0) | |
978 | return r; | |
979 | ||
980 | m->container_offsets[m->n_containers ++] = r; | |
981 | ||
982 | return 0; | |
983 | } | |
984 | ||
985 | int sd_rtnl_message_open_container_union(sd_rtnl_message *m, unsigned short type, const char *key) { | |
986 | const NLTypeSystemUnion *type_system_union; | |
987 | int r; | |
988 | ||
989 | assert_return(m, -EINVAL); | |
990 | assert_return(!m->sealed, -EPERM); | |
991 | ||
992 | r = type_system_get_type_system_union(m->container_type_system[m->n_containers], &type_system_union, type); | |
993 | if (r < 0) | |
994 | return r; | |
995 | ||
996 | r = type_system_union_get_type_system(type_system_union, | |
997 | &m->container_type_system[m->n_containers + 1], | |
998 | key); | |
999 | if (r < 0) | |
1000 | return r; | |
1001 | ||
1002 | r = sd_rtnl_message_append_string(m, type_system_union->match, key); | |
1003 | if (r < 0) | |
1004 | return r; | |
1005 | ||
1006 | /* do we evere need non-null size */ | |
1007 | r = add_rtattr(m, type, NULL, 0); | |
1008 | if (r < 0) | |
1009 | return r; | |
1010 | ||
1011 | m->container_offsets[m->n_containers ++] = r; | |
1012 | ||
1013 | return 0; | |
1014 | } | |
1015 | ||
1016 | ||
1017 | int sd_rtnl_message_close_container(sd_rtnl_message *m) { | |
1018 | assert_return(m, -EINVAL); | |
1019 | assert_return(!m->sealed, -EPERM); | |
1020 | assert_return(m->n_containers > 0, -EINVAL); | |
1021 | ||
1022 | m->container_type_system[m->n_containers] = NULL; | |
1023 | m->n_containers --; | |
1024 | ||
1025 | return 0; | |
1026 | } | |
1027 | ||
1028 | int rtnl_message_read_internal(sd_rtnl_message *m, unsigned short type, void **data) { | |
1029 | struct rtattr *rta; | |
1030 | ||
1031 | assert_return(m, -EINVAL); | |
1032 | assert_return(m->sealed, -EPERM); | |
1033 | assert_return(data, -EINVAL); | |
1034 | assert(m->n_containers <= RTNL_CONTAINER_DEPTH); | |
1035 | assert(m->rta_offset_tb[m->n_containers]); | |
1036 | assert(type < m->rta_tb_size[m->n_containers]); | |
1037 | ||
1038 | if(!m->rta_offset_tb[m->n_containers][type]) | |
1039 | return -ENODATA; | |
1040 | ||
1041 | rta = (struct rtattr*)((uint8_t *) m->hdr + m->rta_offset_tb[m->n_containers][type]); | |
1042 | ||
1043 | *data = RTA_DATA(rta); | |
1044 | ||
1045 | return RTA_PAYLOAD(rta); | |
1046 | } | |
1047 | ||
1048 | int sd_rtnl_message_read_string(sd_rtnl_message *m, unsigned short type, const char **data) { | |
1049 | int r; | |
1050 | void *attr_data; | |
1051 | ||
1052 | assert_return(m, -EINVAL); | |
1053 | ||
1054 | r = message_attribute_has_type(m, type, NLA_STRING); | |
1055 | if (r < 0) | |
1056 | return r; | |
1057 | ||
1058 | r = rtnl_message_read_internal(m, type, &attr_data); | |
1059 | if (r < 0) | |
1060 | return r; | |
1061 | else if (strnlen(attr_data, r) >= (size_t) r) | |
1062 | return -EIO; | |
1063 | ||
1064 | if (data) | |
1065 | *data = (const char *) attr_data; | |
1066 | ||
1067 | return 0; | |
1068 | } | |
1069 | ||
1070 | int sd_rtnl_message_read_u8(sd_rtnl_message *m, unsigned short type, uint8_t *data) { | |
1071 | int r; | |
1072 | void *attr_data; | |
1073 | ||
1074 | assert_return(m, -EINVAL); | |
1075 | ||
1076 | r = message_attribute_has_type(m, type, NLA_U8); | |
1077 | if (r < 0) | |
1078 | return r; | |
1079 | ||
1080 | r = rtnl_message_read_internal(m, type, &attr_data); | |
1081 | if (r < 0) | |
1082 | return r; | |
1083 | else if ((size_t) r < sizeof(uint8_t)) | |
1084 | return -EIO; | |
1085 | ||
1086 | if (data) | |
1087 | *data = *(uint8_t *) attr_data; | |
1088 | ||
1089 | return 0; | |
1090 | } | |
1091 | ||
1092 | int sd_rtnl_message_read_u16(sd_rtnl_message *m, unsigned short type, uint16_t *data) { | |
1093 | int r; | |
1094 | void *attr_data; | |
1095 | ||
1096 | assert_return(m, -EINVAL); | |
1097 | ||
1098 | r = message_attribute_has_type(m, type, NLA_U16); | |
1099 | if (r < 0) | |
1100 | return r; | |
1101 | ||
1102 | r = rtnl_message_read_internal(m, type, &attr_data); | |
1103 | if (r < 0) | |
1104 | return r; | |
1105 | else if ((size_t) r < sizeof(uint16_t)) | |
1106 | return -EIO; | |
1107 | ||
1108 | if (data) | |
1109 | *data = *(uint16_t *) attr_data; | |
1110 | ||
1111 | return 0; | |
1112 | } | |
1113 | ||
1114 | int sd_rtnl_message_read_u32(sd_rtnl_message *m, unsigned short type, uint32_t *data) { | |
1115 | int r; | |
1116 | void *attr_data; | |
1117 | ||
1118 | assert_return(m, -EINVAL); | |
1119 | ||
1120 | r = message_attribute_has_type(m, type, NLA_U32); | |
1121 | if (r < 0) | |
1122 | return r; | |
1123 | ||
1124 | r = rtnl_message_read_internal(m, type, &attr_data); | |
1125 | if (r < 0) | |
1126 | return r; | |
1127 | else if ((size_t)r < sizeof(uint32_t)) | |
1128 | return -EIO; | |
1129 | ||
1130 | if (data) | |
1131 | *data = *(uint32_t *) attr_data; | |
1132 | ||
1133 | return 0; | |
1134 | } | |
1135 | ||
1136 | int sd_rtnl_message_read_ether_addr(sd_rtnl_message *m, unsigned short type, struct ether_addr *data) { | |
1137 | int r; | |
1138 | void *attr_data; | |
1139 | ||
1140 | assert_return(m, -EINVAL); | |
1141 | ||
1142 | r = message_attribute_has_type(m, type, NLA_ETHER_ADDR); | |
1143 | if (r < 0) | |
1144 | return r; | |
1145 | ||
1146 | r = rtnl_message_read_internal(m, type, &attr_data); | |
1147 | if (r < 0) | |
1148 | return r; | |
1149 | else if ((size_t)r < sizeof(struct ether_addr)) | |
1150 | return -EIO; | |
1151 | ||
1152 | if (data) | |
1153 | memcpy(data, attr_data, sizeof(struct ether_addr)); | |
1154 | ||
1155 | return 0; | |
1156 | } | |
1157 | ||
1158 | int sd_rtnl_message_read_cache_info(sd_rtnl_message *m, unsigned short type, struct ifa_cacheinfo *info) { | |
1159 | int r; | |
1160 | void *attr_data; | |
1161 | ||
1162 | assert_return(m, -EINVAL); | |
1163 | ||
1164 | r = message_attribute_has_type(m, type, NLA_CACHE_INFO); | |
1165 | if (r < 0) | |
1166 | return r; | |
1167 | ||
1168 | r = rtnl_message_read_internal(m, type, &attr_data); | |
1169 | if (r < 0) | |
1170 | return r; | |
1171 | else if ((size_t)r < sizeof(struct ifa_cacheinfo)) | |
1172 | return -EIO; | |
1173 | ||
1174 | if (info) | |
1175 | memcpy(info, attr_data, sizeof(struct ifa_cacheinfo)); | |
1176 | ||
1177 | return 0; | |
1178 | } | |
1179 | ||
1180 | int sd_rtnl_message_read_in_addr(sd_rtnl_message *m, unsigned short type, struct in_addr *data) { | |
1181 | int r; | |
1182 | void *attr_data; | |
1183 | ||
1184 | assert_return(m, -EINVAL); | |
1185 | ||
1186 | r = message_attribute_has_type(m, type, NLA_IN_ADDR); | |
1187 | if (r < 0) | |
1188 | return r; | |
1189 | ||
1190 | r = rtnl_message_read_internal(m, type, &attr_data); | |
1191 | if (r < 0) | |
1192 | return r; | |
1193 | else if ((size_t)r < sizeof(struct in_addr)) | |
1194 | return -EIO; | |
1195 | ||
1196 | if (data) | |
1197 | memcpy(data, attr_data, sizeof(struct in_addr)); | |
1198 | ||
1199 | return 0; | |
1200 | } | |
1201 | ||
1202 | int sd_rtnl_message_read_in6_addr(sd_rtnl_message *m, unsigned short type, struct in6_addr *data) { | |
1203 | int r; | |
1204 | void *attr_data; | |
1205 | ||
1206 | assert_return(m, -EINVAL); | |
1207 | ||
1208 | r = message_attribute_has_type(m, type, NLA_IN_ADDR); | |
1209 | if (r < 0) | |
1210 | return r; | |
1211 | ||
1212 | r = rtnl_message_read_internal(m, type, &attr_data); | |
1213 | if (r < 0) | |
1214 | return r; | |
1215 | else if ((size_t)r < sizeof(struct in6_addr)) | |
1216 | return -EIO; | |
1217 | ||
1218 | if (data) | |
1219 | memcpy(data, attr_data, sizeof(struct in6_addr)); | |
1220 | ||
1221 | return 0; | |
1222 | } | |
1223 | ||
1224 | int sd_rtnl_message_enter_container(sd_rtnl_message *m, unsigned short type) { | |
1225 | const NLType *nl_type; | |
1226 | const NLTypeSystem *type_system; | |
1227 | void *container; | |
1228 | size_t size; | |
1229 | int r; | |
1230 | ||
1231 | assert_return(m, -EINVAL); | |
1232 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -EINVAL); | |
1233 | ||
1234 | r = type_system_get_type(m->container_type_system[m->n_containers], | |
1235 | &nl_type, | |
1236 | type); | |
1237 | if (r < 0) | |
1238 | return r; | |
1239 | ||
1240 | if (nl_type->type == NLA_NESTED) { | |
1241 | r = type_system_get_type_system(m->container_type_system[m->n_containers], | |
1242 | &type_system, | |
1243 | type); | |
1244 | if (r < 0) | |
1245 | return r; | |
1246 | } else if (nl_type->type == NLA_UNION) { | |
1247 | const NLTypeSystemUnion *type_system_union; | |
1248 | ||
1249 | r = type_system_get_type_system_union(m->container_type_system[m->n_containers], | |
1250 | &type_system_union, | |
1251 | type); | |
1252 | if (r < 0) | |
1253 | return r; | |
1254 | ||
1255 | switch (type_system_union->match_type) { | |
1256 | case NL_MATCH_SIBLING: | |
1257 | { | |
1258 | const char *key; | |
1259 | ||
1260 | r = sd_rtnl_message_read_string(m, type_system_union->match, &key); | |
1261 | if (r < 0) | |
1262 | return r; | |
1263 | ||
1264 | r = type_system_union_get_type_system(type_system_union, | |
1265 | &type_system, | |
1266 | key); | |
1267 | if (r < 0) | |
1268 | return r; | |
1269 | ||
1270 | break; | |
1271 | } | |
1272 | case NL_MATCH_PROTOCOL: | |
1273 | { | |
1274 | int family; | |
1275 | ||
1276 | r = sd_rtnl_message_get_family(m, &family); | |
1277 | if (r < 0) | |
1278 | return r; | |
1279 | ||
1280 | r = type_system_union_protocol_get_type_system(type_system_union, | |
1281 | &type_system, | |
1282 | family); | |
1283 | if (r < 0) | |
1284 | return r; | |
1285 | ||
1286 | break; | |
1287 | } | |
1288 | default: | |
1289 | assert_not_reached("sd-rtnl: invalid type system union type"); | |
1290 | } | |
1291 | } else | |
1292 | return -EINVAL; | |
1293 | ||
1294 | r = rtnl_message_read_internal(m, type, &container); | |
1295 | if (r < 0) | |
1296 | return r; | |
1297 | else | |
1298 | size = (size_t)r; | |
1299 | ||
1300 | m->n_containers ++; | |
1301 | ||
1302 | r = rtnl_message_parse(m, | |
1303 | &m->rta_offset_tb[m->n_containers], | |
1304 | &m->rta_tb_size[m->n_containers], | |
1305 | type_system->max, | |
1306 | container, | |
1307 | size); | |
1308 | if (r < 0) { | |
1309 | m->n_containers --; | |
1310 | return r; | |
1311 | } | |
1312 | ||
1313 | m->container_type_system[m->n_containers] = type_system; | |
1314 | ||
1315 | return 0; | |
1316 | } | |
1317 | ||
1318 | int sd_rtnl_message_exit_container(sd_rtnl_message *m) { | |
1319 | assert_return(m, -EINVAL); | |
1320 | assert_return(m->sealed, -EINVAL); | |
1321 | assert_return(m->n_containers > 0, -EINVAL); | |
1322 | ||
1323 | free(m->rta_offset_tb[m->n_containers]); | |
1324 | m->rta_offset_tb[m->n_containers] = NULL; | |
1325 | m->container_type_system[m->n_containers] = NULL; | |
1326 | ||
1327 | m->n_containers --; | |
1328 | ||
1329 | return 0; | |
1330 | } | |
1331 | ||
1332 | uint32_t rtnl_message_get_serial(sd_rtnl_message *m) { | |
1333 | assert(m); | |
1334 | assert(m->hdr); | |
1335 | ||
1336 | return m->hdr->nlmsg_seq; | |
1337 | } | |
1338 | ||
1339 | int sd_rtnl_message_is_error(sd_rtnl_message *m) { | |
1340 | assert_return(m, 0); | |
1341 | assert_return(m->hdr, 0); | |
1342 | ||
1343 | return m->hdr->nlmsg_type == NLMSG_ERROR; | |
1344 | } | |
1345 | ||
1346 | int sd_rtnl_message_get_errno(sd_rtnl_message *m) { | |
1347 | struct nlmsgerr *err; | |
1348 | ||
1349 | assert_return(m, -EINVAL); | |
1350 | assert_return(m->hdr, -EINVAL); | |
1351 | ||
1352 | if (!sd_rtnl_message_is_error(m)) | |
1353 | return 0; | |
1354 | ||
1355 | err = NLMSG_DATA(m->hdr); | |
1356 | ||
1357 | return err->error; | |
1358 | } | |
1359 | ||
1360 | int rtnl_message_parse(sd_rtnl_message *m, | |
1361 | size_t **rta_offset_tb, | |
1362 | unsigned short *rta_tb_size, | |
1363 | int max, | |
1364 | struct rtattr *rta, | |
1365 | unsigned int rt_len) { | |
1366 | unsigned short type; | |
1367 | size_t *tb; | |
1368 | ||
1369 | tb = new0(size_t, max + 1); | |
1370 | if(!tb) | |
1371 | return -ENOMEM; | |
1372 | ||
1373 | *rta_tb_size = max + 1; | |
1374 | ||
1375 | for (; RTA_OK(rta, rt_len); rta = RTA_NEXT(rta, rt_len)) { | |
1376 | type = RTA_TYPE(rta); | |
1377 | ||
1378 | /* if the kernel is newer than the headers we used | |
1379 | when building, we ignore out-of-range attributes | |
1380 | */ | |
1381 | if (type > max) | |
1382 | continue; | |
1383 | ||
1384 | if (tb[type]) | |
1385 | log_debug("rtnl: message parse - overwriting repeated attribute"); | |
1386 | ||
1387 | tb[type] = (uint8_t *) rta - (uint8_t *) m->hdr; | |
1388 | } | |
1389 | ||
1390 | *rta_offset_tb = tb; | |
1391 | ||
1392 | return 0; | |
1393 | } | |
1394 | ||
1395 | /* returns the number of bytes sent, or a negative error code */ | |
1396 | int socket_write_message(sd_rtnl *nl, sd_rtnl_message *m) { | |
1397 | union { | |
1398 | struct sockaddr sa; | |
1399 | struct sockaddr_nl nl; | |
1400 | } addr = { | |
1401 | .nl.nl_family = AF_NETLINK, | |
1402 | }; | |
1403 | ssize_t k; | |
1404 | ||
1405 | assert(nl); | |
1406 | assert(m); | |
1407 | assert(m->hdr); | |
1408 | ||
1409 | k = sendto(nl->fd, m->hdr, m->hdr->nlmsg_len, | |
1410 | 0, &addr.sa, sizeof(addr)); | |
1411 | if (k < 0) | |
1412 | return (errno == EAGAIN) ? 0 : -errno; | |
1413 | ||
1414 | return k; | |
1415 | } | |
1416 | ||
1417 | static int socket_recv_message(int fd, struct iovec *iov, uint32_t *_group, bool peek) { | |
1418 | uint8_t cred_buffer[CMSG_SPACE(sizeof(struct ucred)) + | |
1419 | CMSG_SPACE(sizeof(struct nl_pktinfo))]; | |
1420 | struct msghdr msg = { | |
1421 | .msg_iov = iov, | |
1422 | .msg_iovlen = 1, | |
1423 | .msg_control = cred_buffer, | |
1424 | .msg_controllen = sizeof(cred_buffer), | |
1425 | }; | |
1426 | struct cmsghdr *cmsg; | |
1427 | uint32_t group = 0; | |
1428 | bool auth = false; | |
1429 | int r; | |
1430 | ||
1431 | assert(fd >= 0); | |
1432 | assert(iov); | |
1433 | ||
1434 | r = recvmsg(fd, &msg, MSG_TRUNC | (peek ? MSG_PEEK : 0)); | |
1435 | if (r < 0) { | |
1436 | /* no data */ | |
1437 | if (errno == ENOBUFS) | |
1438 | log_debug("rtnl: kernel receive buffer overrun"); | |
1439 | else if (errno == EAGAIN) | |
1440 | log_debug("rtnl: no data in socket"); | |
1441 | ||
1442 | return (errno == EAGAIN || errno == EINTR) ? 0 : -errno; | |
1443 | } | |
1444 | ||
1445 | for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) { | |
1446 | if (cmsg->cmsg_level == SOL_SOCKET && | |
1447 | cmsg->cmsg_type == SCM_CREDENTIALS && | |
1448 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) { | |
1449 | struct ucred *ucred = (void *)CMSG_DATA(cmsg); | |
1450 | ||
1451 | /* from the kernel */ | |
1452 | if (ucred->pid == 0) | |
1453 | auth = true; | |
1454 | else | |
1455 | log_debug("rtnl: ignoring message from PID "PID_FMT, ucred->pid); | |
1456 | } else if (cmsg->cmsg_level == SOL_NETLINK && | |
1457 | cmsg->cmsg_type == NETLINK_PKTINFO && | |
1458 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct nl_pktinfo))) { | |
1459 | struct nl_pktinfo *pktinfo = (void *)CMSG_DATA(cmsg); | |
1460 | ||
1461 | /* multi-cast group */ | |
1462 | group = pktinfo->group; | |
1463 | } | |
1464 | } | |
1465 | ||
1466 | if (!auth) { | |
1467 | /* not from the kernel, ignore */ | |
1468 | if (peek) { | |
1469 | /* drop the message */ | |
1470 | r = recvmsg(fd, &msg, 0); | |
1471 | if (r < 0) | |
1472 | return (errno == EAGAIN || errno == EINTR) ? 0 : -errno; | |
1473 | } | |
1474 | ||
1475 | return 0; | |
1476 | } | |
1477 | ||
1478 | if (_group) | |
1479 | *_group = group; | |
1480 | ||
1481 | return r; | |
1482 | } | |
1483 | ||
1484 | /* On success, the number of bytes received is returned and *ret points to the received message | |
1485 | * which has a valid header and the correct size. | |
1486 | * If nothing useful was received 0 is returned. | |
1487 | * On failure, a negative error code is returned. | |
1488 | */ | |
1489 | int socket_read_message(sd_rtnl *rtnl) { | |
1490 | _cleanup_rtnl_message_unref_ sd_rtnl_message *first = NULL; | |
1491 | struct iovec iov = {}; | |
1492 | uint32_t group = 0; | |
1493 | bool multi_part = false, done = false; | |
1494 | struct nlmsghdr *new_msg; | |
1495 | size_t len; | |
1496 | int r; | |
1497 | unsigned i = 0; | |
1498 | ||
1499 | assert(rtnl); | |
1500 | assert(rtnl->rbuffer); | |
1501 | assert(rtnl->rbuffer_allocated >= sizeof(struct nlmsghdr)); | |
1502 | ||
1503 | /* read nothing, just get the pending message size */ | |
1504 | r = socket_recv_message(rtnl->fd, &iov, NULL, true); | |
1505 | if (r <= 0) | |
1506 | return r; | |
1507 | else | |
1508 | len = (size_t)r; | |
1509 | ||
1510 | /* make room for the pending message */ | |
1511 | if (!greedy_realloc((void **)&rtnl->rbuffer, | |
1512 | &rtnl->rbuffer_allocated, | |
1513 | len, sizeof(uint8_t))) | |
1514 | return -ENOMEM; | |
1515 | ||
1516 | iov.iov_base = rtnl->rbuffer; | |
1517 | iov.iov_len = rtnl->rbuffer_allocated; | |
1518 | ||
1519 | /* read the pending message */ | |
1520 | r = socket_recv_message(rtnl->fd, &iov, &group, false); | |
1521 | if (r <= 0) | |
1522 | return r; | |
1523 | else | |
1524 | len = (size_t)r; | |
1525 | ||
1526 | if (len > rtnl->rbuffer_allocated) | |
1527 | /* message did not fit in read buffer */ | |
1528 | return -EIO; | |
1529 | ||
1530 | if (NLMSG_OK(rtnl->rbuffer, len) && rtnl->rbuffer->nlmsg_flags & NLM_F_MULTI) { | |
1531 | multi_part = true; | |
1532 | ||
1533 | for (i = 0; i < rtnl->rqueue_partial_size; i++) { | |
1534 | if (rtnl_message_get_serial(rtnl->rqueue_partial[i]) == | |
1535 | rtnl->rbuffer->nlmsg_seq) { | |
1536 | first = rtnl->rqueue_partial[i]; | |
1537 | break; | |
1538 | } | |
1539 | } | |
1540 | } | |
1541 | ||
1542 | for (new_msg = rtnl->rbuffer; NLMSG_OK(new_msg, len) && !done; new_msg = NLMSG_NEXT(new_msg, len)) { | |
1543 | _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL; | |
1544 | const NLType *nl_type; | |
1545 | ||
1546 | if (!group && new_msg->nlmsg_pid != rtnl->sockaddr.nl.nl_pid) | |
1547 | /* not broadcast and not for us */ | |
1548 | continue; | |
1549 | ||
1550 | if (new_msg->nlmsg_type == NLMSG_NOOP) | |
1551 | /* silently drop noop messages */ | |
1552 | continue; | |
1553 | ||
1554 | if (new_msg->nlmsg_type == NLMSG_DONE) { | |
1555 | /* finished reading multi-part message */ | |
1556 | done = true; | |
1557 | ||
1558 | /* if first is not defined, put NLMSG_DONE into the receive queue. */ | |
1559 | if (first) | |
1560 | continue; | |
1561 | } | |
1562 | ||
1563 | /* check that we support this message type */ | |
1564 | r = type_system_get_type(NULL, &nl_type, new_msg->nlmsg_type); | |
1565 | if (r < 0) { | |
1566 | if (r == -EOPNOTSUPP) | |
1567 | log_debug("sd-rtnl: ignored message with unknown type: %i", | |
1568 | new_msg->nlmsg_type); | |
1569 | ||
1570 | continue; | |
1571 | } | |
1572 | ||
1573 | /* check that the size matches the message type */ | |
1574 | if (new_msg->nlmsg_len < NLMSG_LENGTH(nl_type->size)) { | |
1575 | log_debug("sd-rtnl: message larger than expected, dropping"); | |
1576 | continue; | |
1577 | } | |
1578 | ||
1579 | r = message_new_empty(rtnl, &m); | |
1580 | if (r < 0) | |
1581 | return r; | |
1582 | ||
1583 | m->broadcast = !!group; | |
1584 | ||
1585 | m->hdr = memdup(new_msg, new_msg->nlmsg_len); | |
1586 | if (!m->hdr) | |
1587 | return -ENOMEM; | |
1588 | ||
1589 | /* seal and parse the top-level message */ | |
1590 | r = sd_rtnl_message_rewind(m); | |
1591 | if (r < 0) | |
1592 | return r; | |
1593 | ||
1594 | /* push the message onto the multi-part message stack */ | |
1595 | if (first) | |
1596 | m->next = first; | |
1597 | first = m; | |
1598 | m = NULL; | |
1599 | } | |
1600 | ||
1601 | if (len) | |
1602 | log_debug("sd-rtnl: discarding %zu bytes of incoming message", len); | |
1603 | ||
1604 | if (!first) | |
1605 | return 0; | |
1606 | ||
1607 | if (!multi_part || done) { | |
1608 | /* we got a complete message, push it on the read queue */ | |
1609 | r = rtnl_rqueue_make_room(rtnl); | |
1610 | if (r < 0) | |
1611 | return r; | |
1612 | ||
1613 | rtnl->rqueue[rtnl->rqueue_size ++] = first; | |
1614 | first = NULL; | |
1615 | ||
1616 | if (multi_part && (i < rtnl->rqueue_partial_size)) { | |
1617 | /* remove the message form the partial read queue */ | |
1618 | memmove(rtnl->rqueue_partial + i,rtnl->rqueue_partial + i + 1, | |
1619 | sizeof(sd_rtnl_message*) * (rtnl->rqueue_partial_size - i - 1)); | |
1620 | rtnl->rqueue_partial_size --; | |
1621 | } | |
1622 | ||
1623 | return 1; | |
1624 | } else { | |
1625 | /* we only got a partial multi-part message, push it on the | |
1626 | partial read queue */ | |
1627 | if (i < rtnl->rqueue_partial_size) { | |
1628 | rtnl->rqueue_partial[i] = first; | |
1629 | } else { | |
1630 | r = rtnl_rqueue_partial_make_room(rtnl); | |
1631 | if (r < 0) | |
1632 | return r; | |
1633 | ||
1634 | rtnl->rqueue_partial[rtnl->rqueue_partial_size ++] = first; | |
1635 | } | |
1636 | first = NULL; | |
1637 | ||
1638 | return 0; | |
1639 | } | |
1640 | } | |
1641 | ||
1642 | int sd_rtnl_message_rewind(sd_rtnl_message *m) { | |
1643 | const NLType *type; | |
1644 | unsigned i; | |
1645 | int r; | |
1646 | ||
1647 | assert_return(m, -EINVAL); | |
1648 | ||
1649 | /* don't allow appending to message once parsed */ | |
1650 | if (!m->sealed) | |
1651 | rtnl_message_seal(m); | |
1652 | ||
1653 | for (i = 1; i <= m->n_containers; i++) { | |
1654 | free(m->rta_offset_tb[i]); | |
1655 | m->rta_offset_tb[i] = NULL; | |
1656 | m->rta_tb_size[i] = 0; | |
1657 | m->container_type_system[i] = NULL; | |
1658 | } | |
1659 | ||
1660 | m->n_containers = 0; | |
1661 | ||
1662 | if (m->rta_offset_tb[0]) { | |
1663 | /* top-level attributes have already been parsed */ | |
1664 | return 0; | |
1665 | } | |
1666 | ||
1667 | assert(m->hdr); | |
1668 | ||
1669 | r = type_system_get_type(NULL, &type, m->hdr->nlmsg_type); | |
1670 | if (r < 0) | |
1671 | return r; | |
1672 | ||
1673 | if (type->type == NLA_NESTED) { | |
1674 | const NLTypeSystem *type_system = type->type_system; | |
1675 | ||
1676 | assert(type_system); | |
1677 | ||
1678 | m->container_type_system[0] = type_system; | |
1679 | ||
1680 | r = rtnl_message_parse(m, | |
1681 | &m->rta_offset_tb[m->n_containers], | |
1682 | &m->rta_tb_size[m->n_containers], | |
1683 | type_system->max, | |
1684 | (struct rtattr*)((uint8_t*)NLMSG_DATA(m->hdr) + | |
1685 | NLMSG_ALIGN(type->size)), | |
1686 | NLMSG_PAYLOAD(m->hdr, type->size)); | |
1687 | if (r < 0) | |
1688 | return r; | |
1689 | } | |
1690 | ||
1691 | return 0; | |
1692 | } | |
1693 | ||
1694 | void rtnl_message_seal(sd_rtnl_message *m) { | |
1695 | assert(m); | |
1696 | assert(!m->sealed); | |
1697 | ||
1698 | m->sealed = true; | |
1699 | } | |
1700 | ||
1701 | sd_rtnl_message *sd_rtnl_message_next(sd_rtnl_message *m) { | |
1702 | assert_return(m, NULL); | |
1703 | ||
1704 | return m->next; | |
1705 | } |