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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 "socket-util.h" | |
28 | #include "formats-util.h" | |
29 | #include "refcnt.h" | |
30 | #include "missing.h" | |
31 | ||
32 | #include "sd-netlink.h" | |
33 | #include "netlink-util.h" | |
34 | #include "netlink-internal.h" | |
35 | #include "netlink-types.h" | |
36 | ||
37 | #define GET_CONTAINER(m, i) ((i) < (m)->n_containers ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->container_offsets[i]) : NULL) | |
38 | #define PUSH_CONTAINER(m, new) (m)->container_offsets[(m)->n_containers ++] = (uint8_t*)(new) - (uint8_t*)(m)->hdr; | |
39 | ||
40 | #define RTA_TYPE(rta) ((rta)->rta_type & NLA_TYPE_MASK) | |
41 | ||
42 | int message_new_empty(sd_netlink *rtnl, sd_netlink_message **ret) { | |
43 | sd_netlink_message *m; | |
44 | ||
45 | assert_return(ret, -EINVAL); | |
46 | ||
47 | /* Note that 'rtnl' is currently unused, if we start using it internally | |
48 | we must take care to avoid problems due to mutual references between | |
49 | buses and their queued messages. See sd-bus. | |
50 | */ | |
51 | ||
52 | m = new0(sd_netlink_message, 1); | |
53 | if (!m) | |
54 | return -ENOMEM; | |
55 | ||
56 | m->n_ref = REFCNT_INIT; | |
57 | ||
58 | m->sealed = false; | |
59 | ||
60 | *ret = m; | |
61 | ||
62 | return 0; | |
63 | } | |
64 | ||
65 | int message_new(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t type) { | |
66 | _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL; | |
67 | const NLType *nl_type; | |
68 | size_t size; | |
69 | int r; | |
70 | ||
71 | r = type_system_get_type(&type_system_root, &nl_type, type); | |
72 | if (r < 0) | |
73 | return r; | |
74 | ||
75 | if (type_get_type(nl_type) != NETLINK_TYPE_NESTED) | |
76 | return -EINVAL; | |
77 | ||
78 | r = message_new_empty(rtnl, &m); | |
79 | if (r < 0) | |
80 | return r; | |
81 | ||
82 | size = NLMSG_SPACE(type_get_size(nl_type)); | |
83 | ||
84 | assert(size >= sizeof(struct nlmsghdr)); | |
85 | m->hdr = malloc0(size); | |
86 | if (!m->hdr) | |
87 | return -ENOMEM; | |
88 | ||
89 | m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; | |
90 | ||
91 | type_get_type_system(nl_type, &m->container_type_system[0]); | |
92 | m->hdr->nlmsg_len = size; | |
93 | m->hdr->nlmsg_type = type; | |
94 | ||
95 | *ret = m; | |
96 | m = NULL; | |
97 | ||
98 | return 0; | |
99 | } | |
100 | ||
101 | int sd_netlink_message_request_dump(sd_netlink_message *m, int dump) { | |
102 | assert_return(m, -EINVAL); | |
103 | assert_return(m->hdr, -EINVAL); | |
104 | assert_return(m->hdr->nlmsg_type == RTM_GETLINK || | |
105 | m->hdr->nlmsg_type == RTM_GETADDR || | |
106 | m->hdr->nlmsg_type == RTM_GETROUTE || | |
107 | m->hdr->nlmsg_type == RTM_GETNEIGH, | |
108 | -EINVAL); | |
109 | ||
110 | if (dump) | |
111 | m->hdr->nlmsg_flags |= NLM_F_DUMP; | |
112 | else | |
113 | m->hdr->nlmsg_flags &= ~NLM_F_DUMP; | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
118 | sd_netlink_message *sd_netlink_message_ref(sd_netlink_message *m) { | |
119 | if (m) | |
120 | assert_se(REFCNT_INC(m->n_ref) >= 2); | |
121 | ||
122 | return m; | |
123 | } | |
124 | ||
125 | sd_netlink_message *sd_netlink_message_unref(sd_netlink_message *m) { | |
126 | if (m && REFCNT_DEC(m->n_ref) == 0) { | |
127 | unsigned i; | |
128 | ||
129 | free(m->hdr); | |
130 | ||
131 | for (i = 0; i <= m->n_containers; i++) | |
132 | free(m->rta_offset_tb[i]); | |
133 | ||
134 | sd_netlink_message_unref(m->next); | |
135 | ||
136 | free(m); | |
137 | } | |
138 | ||
139 | return NULL; | |
140 | } | |
141 | ||
142 | int sd_netlink_message_get_type(sd_netlink_message *m, uint16_t *type) { | |
143 | assert_return(m, -EINVAL); | |
144 | assert_return(type, -EINVAL); | |
145 | ||
146 | *type = m->hdr->nlmsg_type; | |
147 | ||
148 | return 0; | |
149 | } | |
150 | ||
151 | int sd_netlink_message_is_broadcast(sd_netlink_message *m) { | |
152 | assert_return(m, -EINVAL); | |
153 | ||
154 | return m->broadcast; | |
155 | } | |
156 | ||
157 | /* If successful the updated message will be correctly aligned, if | |
158 | unsuccessful the old message is untouched. */ | |
159 | static int add_rtattr(sd_netlink_message *m, unsigned short type, const void *data, size_t data_length) { | |
160 | uint32_t rta_length; | |
161 | size_t message_length, padding_length; | |
162 | struct nlmsghdr *new_hdr; | |
163 | struct rtattr *rta; | |
164 | char *padding; | |
165 | unsigned i; | |
166 | int offset; | |
167 | ||
168 | assert(m); | |
169 | assert(m->hdr); | |
170 | assert(!m->sealed); | |
171 | assert(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len); | |
172 | assert(!data || data_length); | |
173 | ||
174 | /* get offset of the new attribute */ | |
175 | offset = m->hdr->nlmsg_len; | |
176 | ||
177 | /* get the size of the new rta attribute (with padding at the end) */ | |
178 | rta_length = RTA_LENGTH(data_length); | |
179 | ||
180 | /* get the new message size (with padding at the end) */ | |
181 | message_length = offset + RTA_ALIGN(rta_length); | |
182 | ||
183 | /* realloc to fit the new attribute */ | |
184 | new_hdr = realloc(m->hdr, message_length); | |
185 | if (!new_hdr) | |
186 | return -ENOMEM; | |
187 | m->hdr = new_hdr; | |
188 | ||
189 | /* get pointer to the attribute we are about to add */ | |
190 | rta = (struct rtattr *) ((uint8_t *) m->hdr + offset); | |
191 | ||
192 | /* if we are inside containers, extend them */ | |
193 | for (i = 0; i < m->n_containers; i++) | |
194 | GET_CONTAINER(m, i)->rta_len += message_length - offset; | |
195 | ||
196 | /* fill in the attribute */ | |
197 | rta->rta_type = type; | |
198 | rta->rta_len = rta_length; | |
199 | if (data) | |
200 | /* we don't deal with the case where the user lies about the type | |
201 | * and gives us too little data (so don't do that) | |
202 | */ | |
203 | padding = mempcpy(RTA_DATA(rta), data, data_length); | |
204 | else { | |
205 | /* if no data was passed, make sure we still initialize the padding | |
206 | note that we can have data_length > 0 (used by some containers) */ | |
207 | padding = RTA_DATA(rta); | |
208 | } | |
209 | ||
210 | /* make sure also the padding at the end of the message is initialized */ | |
211 | padding_length = (uint8_t*)m->hdr + message_length - (uint8_t*)padding; | |
212 | memzero(padding, padding_length); | |
213 | ||
214 | /* update message size */ | |
215 | m->hdr->nlmsg_len = message_length; | |
216 | ||
217 | return offset; | |
218 | } | |
219 | ||
220 | static int message_attribute_has_type(sd_netlink_message *m, size_t *out_size, uint16_t attribute_type, uint16_t data_type) { | |
221 | const NLType *type; | |
222 | int r; | |
223 | ||
224 | assert(m); | |
225 | ||
226 | r = type_system_get_type(m->container_type_system[m->n_containers], &type, attribute_type); | |
227 | if (r < 0) | |
228 | return r; | |
229 | ||
230 | if (type_get_type(type) != data_type) | |
231 | return -EINVAL; | |
232 | ||
233 | if (out_size) | |
234 | *out_size = type_get_size(type); | |
235 | return 0; | |
236 | } | |
237 | ||
238 | int sd_netlink_message_append_string(sd_netlink_message *m, unsigned short type, const char *data) { | |
239 | size_t length, size; | |
240 | int r; | |
241 | ||
242 | assert_return(m, -EINVAL); | |
243 | assert_return(!m->sealed, -EPERM); | |
244 | assert_return(data, -EINVAL); | |
245 | ||
246 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_STRING); | |
247 | if (r < 0) | |
248 | return r; | |
249 | ||
250 | if (size) { | |
251 | length = strnlen(data, size+1); | |
252 | if (length > size) | |
253 | return -EINVAL; | |
254 | } else | |
255 | length = strlen(data); | |
256 | ||
257 | r = add_rtattr(m, type, data, length + 1); | |
258 | if (r < 0) | |
259 | return r; | |
260 | ||
261 | return 0; | |
262 | } | |
263 | ||
264 | int sd_netlink_message_append_u8(sd_netlink_message *m, unsigned short type, uint8_t data) { | |
265 | int r; | |
266 | ||
267 | assert_return(m, -EINVAL); | |
268 | assert_return(!m->sealed, -EPERM); | |
269 | ||
270 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U8); | |
271 | if (r < 0) | |
272 | return r; | |
273 | ||
274 | r = add_rtattr(m, type, &data, sizeof(uint8_t)); | |
275 | if (r < 0) | |
276 | return r; | |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
281 | ||
282 | int sd_netlink_message_append_u16(sd_netlink_message *m, unsigned short type, uint16_t data) { | |
283 | int r; | |
284 | ||
285 | assert_return(m, -EINVAL); | |
286 | assert_return(!m->sealed, -EPERM); | |
287 | ||
288 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U16); | |
289 | if (r < 0) | |
290 | return r; | |
291 | ||
292 | r = add_rtattr(m, type, &data, sizeof(uint16_t)); | |
293 | if (r < 0) | |
294 | return r; | |
295 | ||
296 | return 0; | |
297 | } | |
298 | ||
299 | int sd_netlink_message_append_u32(sd_netlink_message *m, unsigned short type, uint32_t data) { | |
300 | int r; | |
301 | ||
302 | assert_return(m, -EINVAL); | |
303 | assert_return(!m->sealed, -EPERM); | |
304 | ||
305 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U32); | |
306 | if (r < 0) | |
307 | return r; | |
308 | ||
309 | r = add_rtattr(m, type, &data, sizeof(uint32_t)); | |
310 | if (r < 0) | |
311 | return r; | |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
316 | int sd_netlink_message_append_in_addr(sd_netlink_message *m, unsigned short type, const struct in_addr *data) { | |
317 | int r; | |
318 | ||
319 | assert_return(m, -EINVAL); | |
320 | assert_return(!m->sealed, -EPERM); | |
321 | assert_return(data, -EINVAL); | |
322 | ||
323 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); | |
324 | if (r < 0) | |
325 | return r; | |
326 | ||
327 | r = add_rtattr(m, type, data, sizeof(struct in_addr)); | |
328 | if (r < 0) | |
329 | return r; | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
334 | int sd_netlink_message_append_in6_addr(sd_netlink_message *m, unsigned short type, const struct in6_addr *data) { | |
335 | int r; | |
336 | ||
337 | assert_return(m, -EINVAL); | |
338 | assert_return(!m->sealed, -EPERM); | |
339 | assert_return(data, -EINVAL); | |
340 | ||
341 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); | |
342 | if (r < 0) | |
343 | return r; | |
344 | ||
345 | r = add_rtattr(m, type, data, sizeof(struct in6_addr)); | |
346 | if (r < 0) | |
347 | return r; | |
348 | ||
349 | return 0; | |
350 | } | |
351 | ||
352 | int sd_netlink_message_append_ether_addr(sd_netlink_message *m, unsigned short type, const struct ether_addr *data) { | |
353 | int r; | |
354 | ||
355 | assert_return(m, -EINVAL); | |
356 | assert_return(!m->sealed, -EPERM); | |
357 | assert_return(data, -EINVAL); | |
358 | ||
359 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_ETHER_ADDR); | |
360 | if (r < 0) | |
361 | return r; | |
362 | ||
363 | r = add_rtattr(m, type, data, ETH_ALEN); | |
364 | if (r < 0) | |
365 | return r; | |
366 | ||
367 | return 0; | |
368 | } | |
369 | ||
370 | int sd_netlink_message_append_cache_info(sd_netlink_message *m, unsigned short type, const struct ifa_cacheinfo *info) { | |
371 | int r; | |
372 | ||
373 | assert_return(m, -EINVAL); | |
374 | assert_return(!m->sealed, -EPERM); | |
375 | assert_return(info, -EINVAL); | |
376 | ||
377 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_CACHE_INFO); | |
378 | if (r < 0) | |
379 | return r; | |
380 | ||
381 | r = add_rtattr(m, type, info, sizeof(struct ifa_cacheinfo)); | |
382 | if (r < 0) | |
383 | return r; | |
384 | ||
385 | return 0; | |
386 | } | |
387 | ||
388 | int sd_netlink_message_open_container(sd_netlink_message *m, unsigned short type) { | |
389 | size_t size; | |
390 | int r; | |
391 | ||
392 | assert_return(m, -EINVAL); | |
393 | assert_return(!m->sealed, -EPERM); | |
394 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -ERANGE); | |
395 | ||
396 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_NESTED); | |
397 | if (r < 0) { | |
398 | const NLTypeSystemUnion *type_system_union; | |
399 | int family; | |
400 | ||
401 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_UNION); | |
402 | if (r < 0) | |
403 | return r; | |
404 | ||
405 | r = sd_rtnl_message_get_family(m, &family); | |
406 | if (r < 0) | |
407 | return r; | |
408 | ||
409 | r = type_system_get_type_system_union(m->container_type_system[m->n_containers], &type_system_union, type); | |
410 | if (r < 0) | |
411 | return r; | |
412 | ||
413 | r = type_system_union_protocol_get_type_system(type_system_union, | |
414 | &m->container_type_system[m->n_containers + 1], | |
415 | family); | |
416 | if (r < 0) | |
417 | return r; | |
418 | } else { | |
419 | r = type_system_get_type_system(m->container_type_system[m->n_containers], | |
420 | &m->container_type_system[m->n_containers + 1], | |
421 | type); | |
422 | if (r < 0) | |
423 | return r; | |
424 | } | |
425 | ||
426 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, size); | |
427 | if (r < 0) | |
428 | return r; | |
429 | ||
430 | m->container_offsets[m->n_containers ++] = r; | |
431 | ||
432 | return 0; | |
433 | } | |
434 | ||
435 | int sd_netlink_message_open_container_union(sd_netlink_message *m, unsigned short type, const char *key) { | |
436 | const NLTypeSystemUnion *type_system_union; | |
437 | int r; | |
438 | ||
439 | assert_return(m, -EINVAL); | |
440 | assert_return(!m->sealed, -EPERM); | |
441 | ||
442 | r = type_system_get_type_system_union(m->container_type_system[m->n_containers], &type_system_union, type); | |
443 | if (r < 0) | |
444 | return r; | |
445 | ||
446 | r = type_system_union_get_type_system(type_system_union, | |
447 | &m->container_type_system[m->n_containers + 1], | |
448 | key); | |
449 | if (r < 0) | |
450 | return r; | |
451 | ||
452 | r = sd_netlink_message_append_string(m, type_system_union->match, key); | |
453 | if (r < 0) | |
454 | return r; | |
455 | ||
456 | /* do we evere need non-null size */ | |
457 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, 0); | |
458 | if (r < 0) | |
459 | return r; | |
460 | ||
461 | m->container_offsets[m->n_containers ++] = r; | |
462 | ||
463 | return 0; | |
464 | } | |
465 | ||
466 | ||
467 | int sd_netlink_message_close_container(sd_netlink_message *m) { | |
468 | assert_return(m, -EINVAL); | |
469 | assert_return(!m->sealed, -EPERM); | |
470 | assert_return(m->n_containers > 0, -EINVAL); | |
471 | ||
472 | m->container_type_system[m->n_containers] = NULL; | |
473 | m->n_containers --; | |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
478 | int rtnl_message_read_internal(sd_netlink_message *m, unsigned short type, void **data) { | |
479 | struct rtattr *rta; | |
480 | ||
481 | assert_return(m, -EINVAL); | |
482 | assert_return(m->sealed, -EPERM); | |
483 | assert_return(data, -EINVAL); | |
484 | assert(m->n_containers <= RTNL_CONTAINER_DEPTH); | |
485 | assert(m->rta_offset_tb[m->n_containers]); | |
486 | assert(type < m->rta_tb_size[m->n_containers]); | |
487 | ||
488 | if(!m->rta_offset_tb[m->n_containers][type]) | |
489 | return -ENODATA; | |
490 | ||
491 | rta = (struct rtattr*)((uint8_t *) m->hdr + m->rta_offset_tb[m->n_containers][type]); | |
492 | ||
493 | *data = RTA_DATA(rta); | |
494 | ||
495 | return RTA_PAYLOAD(rta); | |
496 | } | |
497 | ||
498 | int sd_netlink_message_read_string(sd_netlink_message *m, unsigned short type, const char **data) { | |
499 | int r; | |
500 | void *attr_data; | |
501 | ||
502 | assert_return(m, -EINVAL); | |
503 | ||
504 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_STRING); | |
505 | if (r < 0) | |
506 | return r; | |
507 | ||
508 | r = rtnl_message_read_internal(m, type, &attr_data); | |
509 | if (r < 0) | |
510 | return r; | |
511 | else if (strnlen(attr_data, r) >= (size_t) r) | |
512 | return -EIO; | |
513 | ||
514 | if (data) | |
515 | *data = (const char *) attr_data; | |
516 | ||
517 | return 0; | |
518 | } | |
519 | ||
520 | int sd_netlink_message_read_u8(sd_netlink_message *m, unsigned short type, uint8_t *data) { | |
521 | int r; | |
522 | void *attr_data; | |
523 | ||
524 | assert_return(m, -EINVAL); | |
525 | ||
526 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U8); | |
527 | if (r < 0) | |
528 | return r; | |
529 | ||
530 | r = rtnl_message_read_internal(m, type, &attr_data); | |
531 | if (r < 0) | |
532 | return r; | |
533 | else if ((size_t) r < sizeof(uint8_t)) | |
534 | return -EIO; | |
535 | ||
536 | if (data) | |
537 | *data = *(uint8_t *) attr_data; | |
538 | ||
539 | return 0; | |
540 | } | |
541 | ||
542 | int sd_netlink_message_read_u16(sd_netlink_message *m, unsigned short type, uint16_t *data) { | |
543 | int r; | |
544 | void *attr_data; | |
545 | ||
546 | assert_return(m, -EINVAL); | |
547 | ||
548 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U16); | |
549 | if (r < 0) | |
550 | return r; | |
551 | ||
552 | r = rtnl_message_read_internal(m, type, &attr_data); | |
553 | if (r < 0) | |
554 | return r; | |
555 | else if ((size_t) r < sizeof(uint16_t)) | |
556 | return -EIO; | |
557 | ||
558 | if (data) | |
559 | *data = *(uint16_t *) attr_data; | |
560 | ||
561 | return 0; | |
562 | } | |
563 | ||
564 | int sd_netlink_message_read_u32(sd_netlink_message *m, unsigned short type, uint32_t *data) { | |
565 | int r; | |
566 | void *attr_data; | |
567 | ||
568 | assert_return(m, -EINVAL); | |
569 | ||
570 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U32); | |
571 | if (r < 0) | |
572 | return r; | |
573 | ||
574 | r = rtnl_message_read_internal(m, type, &attr_data); | |
575 | if (r < 0) | |
576 | return r; | |
577 | else if ((size_t)r < sizeof(uint32_t)) | |
578 | return -EIO; | |
579 | ||
580 | if (data) | |
581 | *data = *(uint32_t *) attr_data; | |
582 | ||
583 | return 0; | |
584 | } | |
585 | ||
586 | int sd_netlink_message_read_ether_addr(sd_netlink_message *m, unsigned short type, struct ether_addr *data) { | |
587 | int r; | |
588 | void *attr_data; | |
589 | ||
590 | assert_return(m, -EINVAL); | |
591 | ||
592 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_ETHER_ADDR); | |
593 | if (r < 0) | |
594 | return r; | |
595 | ||
596 | r = rtnl_message_read_internal(m, type, &attr_data); | |
597 | if (r < 0) | |
598 | return r; | |
599 | else if ((size_t)r < sizeof(struct ether_addr)) | |
600 | return -EIO; | |
601 | ||
602 | if (data) | |
603 | memcpy(data, attr_data, sizeof(struct ether_addr)); | |
604 | ||
605 | return 0; | |
606 | } | |
607 | ||
608 | int sd_netlink_message_read_cache_info(sd_netlink_message *m, unsigned short type, struct ifa_cacheinfo *info) { | |
609 | int r; | |
610 | void *attr_data; | |
611 | ||
612 | assert_return(m, -EINVAL); | |
613 | ||
614 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_CACHE_INFO); | |
615 | if (r < 0) | |
616 | return r; | |
617 | ||
618 | r = rtnl_message_read_internal(m, type, &attr_data); | |
619 | if (r < 0) | |
620 | return r; | |
621 | else if ((size_t)r < sizeof(struct ifa_cacheinfo)) | |
622 | return -EIO; | |
623 | ||
624 | if (info) | |
625 | memcpy(info, attr_data, sizeof(struct ifa_cacheinfo)); | |
626 | ||
627 | return 0; | |
628 | } | |
629 | ||
630 | int sd_netlink_message_read_in_addr(sd_netlink_message *m, unsigned short type, struct in_addr *data) { | |
631 | int r; | |
632 | void *attr_data; | |
633 | ||
634 | assert_return(m, -EINVAL); | |
635 | ||
636 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); | |
637 | if (r < 0) | |
638 | return r; | |
639 | ||
640 | r = rtnl_message_read_internal(m, type, &attr_data); | |
641 | if (r < 0) | |
642 | return r; | |
643 | else if ((size_t)r < sizeof(struct in_addr)) | |
644 | return -EIO; | |
645 | ||
646 | if (data) | |
647 | memcpy(data, attr_data, sizeof(struct in_addr)); | |
648 | ||
649 | return 0; | |
650 | } | |
651 | ||
652 | int sd_netlink_message_read_in6_addr(sd_netlink_message *m, unsigned short type, struct in6_addr *data) { | |
653 | int r; | |
654 | void *attr_data; | |
655 | ||
656 | assert_return(m, -EINVAL); | |
657 | ||
658 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); | |
659 | if (r < 0) | |
660 | return r; | |
661 | ||
662 | r = rtnl_message_read_internal(m, type, &attr_data); | |
663 | if (r < 0) | |
664 | return r; | |
665 | else if ((size_t)r < sizeof(struct in6_addr)) | |
666 | return -EIO; | |
667 | ||
668 | if (data) | |
669 | memcpy(data, attr_data, sizeof(struct in6_addr)); | |
670 | ||
671 | return 0; | |
672 | } | |
673 | ||
674 | int sd_netlink_message_enter_container(sd_netlink_message *m, unsigned short type_id) { | |
675 | const NLType *nl_type; | |
676 | const NLTypeSystem *type_system; | |
677 | void *container; | |
678 | uint16_t type; | |
679 | size_t size; | |
680 | int r; | |
681 | ||
682 | assert_return(m, -EINVAL); | |
683 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -EINVAL); | |
684 | ||
685 | r = type_system_get_type(m->container_type_system[m->n_containers], | |
686 | &nl_type, | |
687 | type_id); | |
688 | if (r < 0) | |
689 | return r; | |
690 | ||
691 | type = type_get_type(nl_type); | |
692 | ||
693 | if (type == NETLINK_TYPE_NESTED) { | |
694 | r = type_system_get_type_system(m->container_type_system[m->n_containers], | |
695 | &type_system, | |
696 | type_id); | |
697 | if (r < 0) | |
698 | return r; | |
699 | } else if (type == NETLINK_TYPE_UNION) { | |
700 | const NLTypeSystemUnion *type_system_union; | |
701 | ||
702 | r = type_system_get_type_system_union(m->container_type_system[m->n_containers], | |
703 | &type_system_union, | |
704 | type_id); | |
705 | if (r < 0) | |
706 | return r; | |
707 | ||
708 | switch (type_system_union->match_type) { | |
709 | case NL_MATCH_SIBLING: | |
710 | { | |
711 | const char *key; | |
712 | ||
713 | r = sd_netlink_message_read_string(m, type_system_union->match, &key); | |
714 | if (r < 0) | |
715 | return r; | |
716 | ||
717 | r = type_system_union_get_type_system(type_system_union, | |
718 | &type_system, | |
719 | key); | |
720 | if (r < 0) | |
721 | return r; | |
722 | ||
723 | break; | |
724 | } | |
725 | case NL_MATCH_PROTOCOL: | |
726 | { | |
727 | int family; | |
728 | ||
729 | r = sd_rtnl_message_get_family(m, &family); | |
730 | if (r < 0) | |
731 | return r; | |
732 | ||
733 | r = type_system_union_protocol_get_type_system(type_system_union, | |
734 | &type_system, | |
735 | family); | |
736 | if (r < 0) | |
737 | return r; | |
738 | ||
739 | break; | |
740 | } | |
741 | default: | |
742 | assert_not_reached("sd-netlink: invalid type system union type"); | |
743 | } | |
744 | } else | |
745 | return -EINVAL; | |
746 | ||
747 | r = rtnl_message_read_internal(m, type_id, &container); | |
748 | if (r < 0) | |
749 | return r; | |
750 | else | |
751 | size = (size_t)r; | |
752 | ||
753 | m->n_containers ++; | |
754 | ||
755 | r = rtnl_message_parse(m, | |
756 | &m->rta_offset_tb[m->n_containers], | |
757 | &m->rta_tb_size[m->n_containers], | |
758 | type_system_get_count(type_system), | |
759 | container, | |
760 | size); | |
761 | if (r < 0) { | |
762 | m->n_containers --; | |
763 | return r; | |
764 | } | |
765 | ||
766 | m->container_type_system[m->n_containers] = type_system; | |
767 | ||
768 | return 0; | |
769 | } | |
770 | ||
771 | int sd_netlink_message_exit_container(sd_netlink_message *m) { | |
772 | assert_return(m, -EINVAL); | |
773 | assert_return(m->sealed, -EINVAL); | |
774 | assert_return(m->n_containers > 0, -EINVAL); | |
775 | ||
776 | free(m->rta_offset_tb[m->n_containers]); | |
777 | m->rta_offset_tb[m->n_containers] = NULL; | |
778 | m->container_type_system[m->n_containers] = NULL; | |
779 | ||
780 | m->n_containers --; | |
781 | ||
782 | return 0; | |
783 | } | |
784 | ||
785 | uint32_t rtnl_message_get_serial(sd_netlink_message *m) { | |
786 | assert(m); | |
787 | assert(m->hdr); | |
788 | ||
789 | return m->hdr->nlmsg_seq; | |
790 | } | |
791 | ||
792 | int sd_netlink_message_is_error(sd_netlink_message *m) { | |
793 | assert_return(m, 0); | |
794 | assert_return(m->hdr, 0); | |
795 | ||
796 | return m->hdr->nlmsg_type == NLMSG_ERROR; | |
797 | } | |
798 | ||
799 | int sd_netlink_message_get_errno(sd_netlink_message *m) { | |
800 | struct nlmsgerr *err; | |
801 | ||
802 | assert_return(m, -EINVAL); | |
803 | assert_return(m->hdr, -EINVAL); | |
804 | ||
805 | if (!sd_netlink_message_is_error(m)) | |
806 | return 0; | |
807 | ||
808 | err = NLMSG_DATA(m->hdr); | |
809 | ||
810 | return err->error; | |
811 | } | |
812 | ||
813 | int rtnl_message_parse(sd_netlink_message *m, | |
814 | size_t **rta_offset_tb, | |
815 | unsigned short *rta_tb_size, | |
816 | int count, | |
817 | struct rtattr *rta, | |
818 | unsigned int rt_len) { | |
819 | unsigned short type; | |
820 | size_t *tb; | |
821 | ||
822 | tb = new0(size_t, count); | |
823 | if(!tb) | |
824 | return -ENOMEM; | |
825 | ||
826 | *rta_tb_size = count; | |
827 | ||
828 | for (; RTA_OK(rta, rt_len); rta = RTA_NEXT(rta, rt_len)) { | |
829 | type = RTA_TYPE(rta); | |
830 | ||
831 | /* if the kernel is newer than the headers we used | |
832 | when building, we ignore out-of-range attributes | |
833 | */ | |
834 | if (type >= count) | |
835 | continue; | |
836 | ||
837 | if (tb[type]) | |
838 | log_debug("rtnl: message parse - overwriting repeated attribute"); | |
839 | ||
840 | tb[type] = (uint8_t *) rta - (uint8_t *) m->hdr; | |
841 | } | |
842 | ||
843 | *rta_offset_tb = tb; | |
844 | ||
845 | return 0; | |
846 | } | |
847 | ||
848 | int sd_netlink_message_rewind(sd_netlink_message *m) { | |
849 | const NLType *nl_type; | |
850 | uint16_t type; | |
851 | size_t size; | |
852 | unsigned i; | |
853 | int r; | |
854 | ||
855 | assert_return(m, -EINVAL); | |
856 | ||
857 | /* don't allow appending to message once parsed */ | |
858 | if (!m->sealed) | |
859 | rtnl_message_seal(m); | |
860 | ||
861 | for (i = 1; i <= m->n_containers; i++) { | |
862 | free(m->rta_offset_tb[i]); | |
863 | m->rta_offset_tb[i] = NULL; | |
864 | m->rta_tb_size[i] = 0; | |
865 | m->container_type_system[i] = NULL; | |
866 | } | |
867 | ||
868 | m->n_containers = 0; | |
869 | ||
870 | if (m->rta_offset_tb[0]) { | |
871 | /* top-level attributes have already been parsed */ | |
872 | return 0; | |
873 | } | |
874 | ||
875 | assert(m->hdr); | |
876 | ||
877 | r = type_system_get_type(&type_system_root, &nl_type, m->hdr->nlmsg_type); | |
878 | if (r < 0) | |
879 | return r; | |
880 | ||
881 | type = type_get_type(nl_type); | |
882 | size = type_get_size(nl_type); | |
883 | ||
884 | if (type == NETLINK_TYPE_NESTED) { | |
885 | const NLTypeSystem *type_system; | |
886 | ||
887 | type_get_type_system(nl_type, &type_system); | |
888 | ||
889 | m->container_type_system[0] = type_system; | |
890 | ||
891 | r = rtnl_message_parse(m, | |
892 | &m->rta_offset_tb[m->n_containers], | |
893 | &m->rta_tb_size[m->n_containers], | |
894 | type_system_get_count(type_system), | |
895 | (struct rtattr*)((uint8_t*)NLMSG_DATA(m->hdr) + NLMSG_ALIGN(size)), | |
896 | NLMSG_PAYLOAD(m->hdr, size)); | |
897 | if (r < 0) | |
898 | return r; | |
899 | } | |
900 | ||
901 | return 0; | |
902 | } | |
903 | ||
904 | void rtnl_message_seal(sd_netlink_message *m) { | |
905 | assert(m); | |
906 | assert(!m->sealed); | |
907 | ||
908 | m->sealed = true; | |
909 | } | |
910 | ||
911 | sd_netlink_message *sd_netlink_message_next(sd_netlink_message *m) { | |
912 | assert_return(m, NULL); | |
913 | ||
914 | return m->next; | |
915 | } |