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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)->containers[i].offset) : 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 | #define RTA_FLAGS(rta) ((rta)->rta_type & ~NLA_TYPE_MASK) | |
42 | ||
43 | int message_new_empty(sd_netlink *rtnl, sd_netlink_message **ret) { | |
44 | sd_netlink_message *m; | |
45 | ||
46 | assert_return(ret, -EINVAL); | |
47 | ||
48 | /* Note that 'rtnl' is currently unused, if we start using it internally | |
49 | we must take care to avoid problems due to mutual references between | |
50 | buses and their queued messages. See sd-bus. | |
51 | */ | |
52 | ||
53 | m = new0(sd_netlink_message, 1); | |
54 | if (!m) | |
55 | return -ENOMEM; | |
56 | ||
57 | m->n_ref = REFCNT_INIT; | |
58 | ||
59 | m->sealed = false; | |
60 | ||
61 | *ret = m; | |
62 | ||
63 | return 0; | |
64 | } | |
65 | ||
66 | int message_new(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t type) { | |
67 | _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL; | |
68 | const NLType *nl_type; | |
69 | size_t size; | |
70 | int r; | |
71 | ||
72 | r = type_system_get_type(&type_system_root, &nl_type, type); | |
73 | if (r < 0) | |
74 | return r; | |
75 | ||
76 | if (type_get_type(nl_type) != NETLINK_TYPE_NESTED) | |
77 | return -EINVAL; | |
78 | ||
79 | r = message_new_empty(rtnl, &m); | |
80 | if (r < 0) | |
81 | return r; | |
82 | ||
83 | size = NLMSG_SPACE(type_get_size(nl_type)); | |
84 | ||
85 | assert(size >= sizeof(struct nlmsghdr)); | |
86 | m->hdr = malloc0(size); | |
87 | if (!m->hdr) | |
88 | return -ENOMEM; | |
89 | ||
90 | m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; | |
91 | ||
92 | type_get_type_system(nl_type, &m->containers[0].type_system); | |
93 | m->hdr->nlmsg_len = size; | |
94 | m->hdr->nlmsg_type = type; | |
95 | ||
96 | *ret = m; | |
97 | m = NULL; | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
102 | int sd_netlink_message_request_dump(sd_netlink_message *m, int dump) { | |
103 | assert_return(m, -EINVAL); | |
104 | assert_return(m->hdr, -EINVAL); | |
105 | assert_return(m->hdr->nlmsg_type == RTM_GETLINK || | |
106 | m->hdr->nlmsg_type == RTM_GETADDR || | |
107 | m->hdr->nlmsg_type == RTM_GETROUTE || | |
108 | m->hdr->nlmsg_type == RTM_GETNEIGH, | |
109 | -EINVAL); | |
110 | ||
111 | if (dump) | |
112 | m->hdr->nlmsg_flags |= NLM_F_DUMP; | |
113 | else | |
114 | m->hdr->nlmsg_flags &= ~NLM_F_DUMP; | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
119 | sd_netlink_message *sd_netlink_message_ref(sd_netlink_message *m) { | |
120 | if (m) | |
121 | assert_se(REFCNT_INC(m->n_ref) >= 2); | |
122 | ||
123 | return m; | |
124 | } | |
125 | ||
126 | sd_netlink_message *sd_netlink_message_unref(sd_netlink_message *m) { | |
127 | if (m && REFCNT_DEC(m->n_ref) == 0) { | |
128 | unsigned i; | |
129 | ||
130 | free(m->hdr); | |
131 | ||
132 | for (i = 0; i <= m->n_containers; i++) | |
133 | free(m->containers[i].attributes); | |
134 | ||
135 | sd_netlink_message_unref(m->next); | |
136 | ||
137 | free(m); | |
138 | } | |
139 | ||
140 | return NULL; | |
141 | } | |
142 | ||
143 | int sd_netlink_message_get_type(sd_netlink_message *m, uint16_t *type) { | |
144 | assert_return(m, -EINVAL); | |
145 | assert_return(type, -EINVAL); | |
146 | ||
147 | *type = m->hdr->nlmsg_type; | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | int sd_netlink_message_is_broadcast(sd_netlink_message *m) { | |
153 | assert_return(m, -EINVAL); | |
154 | ||
155 | return m->broadcast; | |
156 | } | |
157 | ||
158 | /* If successful the updated message will be correctly aligned, if | |
159 | unsuccessful the old message is untouched. */ | |
160 | static int add_rtattr(sd_netlink_message *m, unsigned short type, const void *data, size_t data_length) { | |
161 | uint32_t rta_length; | |
162 | size_t message_length, padding_length; | |
163 | struct nlmsghdr *new_hdr; | |
164 | struct rtattr *rta; | |
165 | char *padding; | |
166 | unsigned i; | |
167 | int offset; | |
168 | ||
169 | assert(m); | |
170 | assert(m->hdr); | |
171 | assert(!m->sealed); | |
172 | assert(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len); | |
173 | assert(!data || data_length); | |
174 | ||
175 | /* get offset of the new attribute */ | |
176 | offset = m->hdr->nlmsg_len; | |
177 | ||
178 | /* get the size of the new rta attribute (with padding at the end) */ | |
179 | rta_length = RTA_LENGTH(data_length); | |
180 | ||
181 | /* get the new message size (with padding at the end) */ | |
182 | message_length = offset + RTA_ALIGN(rta_length); | |
183 | ||
184 | /* realloc to fit the new attribute */ | |
185 | new_hdr = realloc(m->hdr, message_length); | |
186 | if (!new_hdr) | |
187 | return -ENOMEM; | |
188 | m->hdr = new_hdr; | |
189 | ||
190 | /* get pointer to the attribute we are about to add */ | |
191 | rta = (struct rtattr *) ((uint8_t *) m->hdr + offset); | |
192 | ||
193 | /* if we are inside containers, extend them */ | |
194 | for (i = 0; i < m->n_containers; i++) | |
195 | GET_CONTAINER(m, i)->rta_len += message_length - offset; | |
196 | ||
197 | /* fill in the attribute */ | |
198 | rta->rta_type = type; | |
199 | rta->rta_len = rta_length; | |
200 | if (data) | |
201 | /* we don't deal with the case where the user lies about the type | |
202 | * and gives us too little data (so don't do that) | |
203 | */ | |
204 | padding = mempcpy(RTA_DATA(rta), data, data_length); | |
205 | else { | |
206 | /* if no data was passed, make sure we still initialize the padding | |
207 | note that we can have data_length > 0 (used by some containers) */ | |
208 | padding = RTA_DATA(rta); | |
209 | } | |
210 | ||
211 | /* make sure also the padding at the end of the message is initialized */ | |
212 | padding_length = (uint8_t*)m->hdr + message_length - (uint8_t*)padding; | |
213 | memzero(padding, padding_length); | |
214 | ||
215 | /* update message size */ | |
216 | m->hdr->nlmsg_len = message_length; | |
217 | ||
218 | return offset; | |
219 | } | |
220 | ||
221 | static int message_attribute_has_type(sd_netlink_message *m, size_t *out_size, uint16_t attribute_type, uint16_t data_type) { | |
222 | const NLType *type; | |
223 | int r; | |
224 | ||
225 | assert(m); | |
226 | ||
227 | r = type_system_get_type(m->containers[m->n_containers].type_system, &type, attribute_type); | |
228 | if (r < 0) | |
229 | return r; | |
230 | ||
231 | if (type_get_type(type) != data_type) | |
232 | return -EINVAL; | |
233 | ||
234 | if (out_size) | |
235 | *out_size = type_get_size(type); | |
236 | return 0; | |
237 | } | |
238 | ||
239 | int sd_netlink_message_append_string(sd_netlink_message *m, unsigned short type, const char *data) { | |
240 | size_t length, size; | |
241 | int r; | |
242 | ||
243 | assert_return(m, -EINVAL); | |
244 | assert_return(!m->sealed, -EPERM); | |
245 | assert_return(data, -EINVAL); | |
246 | ||
247 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_STRING); | |
248 | if (r < 0) | |
249 | return r; | |
250 | ||
251 | if (size) { | |
252 | length = strnlen(data, size+1); | |
253 | if (length > size) | |
254 | return -EINVAL; | |
255 | } else | |
256 | length = strlen(data); | |
257 | ||
258 | r = add_rtattr(m, type, data, length + 1); | |
259 | if (r < 0) | |
260 | return r; | |
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
265 | int sd_netlink_message_append_flag(sd_netlink_message *m, unsigned short type) { | |
266 | size_t size; | |
267 | int r; | |
268 | ||
269 | assert_return(m, -EINVAL); | |
270 | assert_return(!m->sealed, -EPERM); | |
271 | ||
272 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_FLAG); | |
273 | if (r < 0) | |
274 | return r; | |
275 | ||
276 | r = add_rtattr(m, type, NULL, 0); | |
277 | if (r < 0) | |
278 | return r; | |
279 | ||
280 | return 0; | |
281 | } | |
282 | ||
283 | int sd_netlink_message_append_u8(sd_netlink_message *m, unsigned short type, uint8_t data) { | |
284 | int r; | |
285 | ||
286 | assert_return(m, -EINVAL); | |
287 | assert_return(!m->sealed, -EPERM); | |
288 | ||
289 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U8); | |
290 | if (r < 0) | |
291 | return r; | |
292 | ||
293 | r = add_rtattr(m, type, &data, sizeof(uint8_t)); | |
294 | if (r < 0) | |
295 | return r; | |
296 | ||
297 | return 0; | |
298 | } | |
299 | ||
300 | ||
301 | int sd_netlink_message_append_u16(sd_netlink_message *m, unsigned short type, uint16_t data) { | |
302 | int r; | |
303 | ||
304 | assert_return(m, -EINVAL); | |
305 | assert_return(!m->sealed, -EPERM); | |
306 | ||
307 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U16); | |
308 | if (r < 0) | |
309 | return r; | |
310 | ||
311 | r = add_rtattr(m, type, &data, sizeof(uint16_t)); | |
312 | if (r < 0) | |
313 | return r; | |
314 | ||
315 | return 0; | |
316 | } | |
317 | ||
318 | int sd_netlink_message_append_u32(sd_netlink_message *m, unsigned short type, uint32_t data) { | |
319 | int r; | |
320 | ||
321 | assert_return(m, -EINVAL); | |
322 | assert_return(!m->sealed, -EPERM); | |
323 | ||
324 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U32); | |
325 | if (r < 0) | |
326 | return r; | |
327 | ||
328 | r = add_rtattr(m, type, &data, sizeof(uint32_t)); | |
329 | if (r < 0) | |
330 | return r; | |
331 | ||
332 | return 0; | |
333 | } | |
334 | ||
335 | int sd_netlink_message_append_in_addr(sd_netlink_message *m, unsigned short type, const struct in_addr *data) { | |
336 | int r; | |
337 | ||
338 | assert_return(m, -EINVAL); | |
339 | assert_return(!m->sealed, -EPERM); | |
340 | assert_return(data, -EINVAL); | |
341 | ||
342 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); | |
343 | if (r < 0) | |
344 | return r; | |
345 | ||
346 | r = add_rtattr(m, type, data, sizeof(struct in_addr)); | |
347 | if (r < 0) | |
348 | return r; | |
349 | ||
350 | return 0; | |
351 | } | |
352 | ||
353 | int sd_netlink_message_append_in6_addr(sd_netlink_message *m, unsigned short type, const struct in6_addr *data) { | |
354 | int r; | |
355 | ||
356 | assert_return(m, -EINVAL); | |
357 | assert_return(!m->sealed, -EPERM); | |
358 | assert_return(data, -EINVAL); | |
359 | ||
360 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); | |
361 | if (r < 0) | |
362 | return r; | |
363 | ||
364 | r = add_rtattr(m, type, data, sizeof(struct in6_addr)); | |
365 | if (r < 0) | |
366 | return r; | |
367 | ||
368 | return 0; | |
369 | } | |
370 | ||
371 | int sd_netlink_message_append_ether_addr(sd_netlink_message *m, unsigned short type, const struct ether_addr *data) { | |
372 | int r; | |
373 | ||
374 | assert_return(m, -EINVAL); | |
375 | assert_return(!m->sealed, -EPERM); | |
376 | assert_return(data, -EINVAL); | |
377 | ||
378 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_ETHER_ADDR); | |
379 | if (r < 0) | |
380 | return r; | |
381 | ||
382 | r = add_rtattr(m, type, data, ETH_ALEN); | |
383 | if (r < 0) | |
384 | return r; | |
385 | ||
386 | return 0; | |
387 | } | |
388 | ||
389 | int sd_netlink_message_append_cache_info(sd_netlink_message *m, unsigned short type, const struct ifa_cacheinfo *info) { | |
390 | int r; | |
391 | ||
392 | assert_return(m, -EINVAL); | |
393 | assert_return(!m->sealed, -EPERM); | |
394 | assert_return(info, -EINVAL); | |
395 | ||
396 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_CACHE_INFO); | |
397 | if (r < 0) | |
398 | return r; | |
399 | ||
400 | r = add_rtattr(m, type, info, sizeof(struct ifa_cacheinfo)); | |
401 | if (r < 0) | |
402 | return r; | |
403 | ||
404 | return 0; | |
405 | } | |
406 | ||
407 | int sd_netlink_message_open_container(sd_netlink_message *m, unsigned short type) { | |
408 | size_t size; | |
409 | int r; | |
410 | ||
411 | assert_return(m, -EINVAL); | |
412 | assert_return(!m->sealed, -EPERM); | |
413 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -ERANGE); | |
414 | ||
415 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_NESTED); | |
416 | if (r < 0) { | |
417 | const NLTypeSystemUnion *type_system_union; | |
418 | int family; | |
419 | ||
420 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_UNION); | |
421 | if (r < 0) | |
422 | return r; | |
423 | ||
424 | r = sd_rtnl_message_get_family(m, &family); | |
425 | if (r < 0) | |
426 | return r; | |
427 | ||
428 | r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, &type_system_union, type); | |
429 | if (r < 0) | |
430 | return r; | |
431 | ||
432 | r = type_system_union_protocol_get_type_system(type_system_union, | |
433 | &m->containers[m->n_containers + 1].type_system, | |
434 | family); | |
435 | if (r < 0) | |
436 | return r; | |
437 | } else { | |
438 | r = type_system_get_type_system(m->containers[m->n_containers].type_system, | |
439 | &m->containers[m->n_containers + 1].type_system, | |
440 | type); | |
441 | if (r < 0) | |
442 | return r; | |
443 | } | |
444 | ||
445 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, size); | |
446 | if (r < 0) | |
447 | return r; | |
448 | ||
449 | m->containers[m->n_containers ++].offset = r; | |
450 | ||
451 | return 0; | |
452 | } | |
453 | ||
454 | int sd_netlink_message_open_container_union(sd_netlink_message *m, unsigned short type, const char *key) { | |
455 | const NLTypeSystemUnion *type_system_union; | |
456 | int r; | |
457 | ||
458 | assert_return(m, -EINVAL); | |
459 | assert_return(!m->sealed, -EPERM); | |
460 | ||
461 | r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, &type_system_union, type); | |
462 | if (r < 0) | |
463 | return r; | |
464 | ||
465 | r = type_system_union_get_type_system(type_system_union, | |
466 | &m->containers[m->n_containers + 1].type_system, | |
467 | key); | |
468 | if (r < 0) | |
469 | return r; | |
470 | ||
471 | r = sd_netlink_message_append_string(m, type_system_union->match, key); | |
472 | if (r < 0) | |
473 | return r; | |
474 | ||
475 | /* do we evere need non-null size */ | |
476 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, 0); | |
477 | if (r < 0) | |
478 | return r; | |
479 | ||
480 | m->containers[m->n_containers ++].offset = r; | |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
485 | ||
486 | int sd_netlink_message_close_container(sd_netlink_message *m) { | |
487 | assert_return(m, -EINVAL); | |
488 | assert_return(!m->sealed, -EPERM); | |
489 | assert_return(m->n_containers > 0, -EINVAL); | |
490 | ||
491 | m->containers[m->n_containers].type_system = NULL; | |
492 | m->n_containers --; | |
493 | ||
494 | return 0; | |
495 | } | |
496 | ||
497 | static int netlink_message_read_internal(sd_netlink_message *m, unsigned short type, void **data, bool *net_byteorder) { | |
498 | struct netlink_attribute *attribute; | |
499 | struct rtattr *rta; | |
500 | ||
501 | assert_return(m, -EINVAL); | |
502 | assert_return(m->sealed, -EPERM); | |
503 | assert_return(data, -EINVAL); | |
504 | assert(m->n_containers < RTNL_CONTAINER_DEPTH); | |
505 | assert(m->containers[m->n_containers].attributes); | |
506 | assert(type < m->containers[m->n_containers].n_attributes); | |
507 | ||
508 | attribute = &m->containers[m->n_containers].attributes[type]; | |
509 | ||
510 | if(!attribute->offset) | |
511 | return -ENODATA; | |
512 | ||
513 | rta = (struct rtattr*)((uint8_t *) m->hdr + attribute->offset); | |
514 | ||
515 | *data = RTA_DATA(rta); | |
516 | ||
517 | if (net_byteorder) | |
518 | *net_byteorder = attribute->net_byteorder; | |
519 | ||
520 | return RTA_PAYLOAD(rta); | |
521 | } | |
522 | ||
523 | int sd_netlink_message_read_string(sd_netlink_message *m, unsigned short type, const char **data) { | |
524 | int r; | |
525 | void *attr_data; | |
526 | ||
527 | assert_return(m, -EINVAL); | |
528 | ||
529 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_STRING); | |
530 | if (r < 0) | |
531 | return r; | |
532 | ||
533 | r = netlink_message_read_internal(m, type, &attr_data, NULL); | |
534 | if (r < 0) | |
535 | return r; | |
536 | else if (strnlen(attr_data, r) >= (size_t) r) | |
537 | return -EIO; | |
538 | ||
539 | if (data) | |
540 | *data = (const char *) attr_data; | |
541 | ||
542 | return 0; | |
543 | } | |
544 | ||
545 | int sd_netlink_message_read_u8(sd_netlink_message *m, unsigned short type, uint8_t *data) { | |
546 | int r; | |
547 | void *attr_data; | |
548 | ||
549 | assert_return(m, -EINVAL); | |
550 | ||
551 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U8); | |
552 | if (r < 0) | |
553 | return r; | |
554 | ||
555 | r = netlink_message_read_internal(m, type, &attr_data, NULL); | |
556 | if (r < 0) | |
557 | return r; | |
558 | else if ((size_t) r < sizeof(uint8_t)) | |
559 | return -EIO; | |
560 | ||
561 | if (data) | |
562 | *data = *(uint8_t *) attr_data; | |
563 | ||
564 | return 0; | |
565 | } | |
566 | ||
567 | int sd_netlink_message_read_u16(sd_netlink_message *m, unsigned short type, uint16_t *data) { | |
568 | void *attr_data; | |
569 | bool net_byteorder; | |
570 | int r; | |
571 | ||
572 | assert_return(m, -EINVAL); | |
573 | ||
574 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U16); | |
575 | if (r < 0) | |
576 | return r; | |
577 | ||
578 | r = netlink_message_read_internal(m, type, &attr_data, &net_byteorder); | |
579 | if (r < 0) | |
580 | return r; | |
581 | else if ((size_t) r < sizeof(uint16_t)) | |
582 | return -EIO; | |
583 | ||
584 | if (data) { | |
585 | if (net_byteorder) | |
586 | *data = be16toh(*(uint16_t *) attr_data); | |
587 | else | |
588 | *data = *(uint16_t *) attr_data; | |
589 | } | |
590 | ||
591 | return 0; | |
592 | } | |
593 | ||
594 | int sd_netlink_message_read_u32(sd_netlink_message *m, unsigned short type, uint32_t *data) { | |
595 | void *attr_data; | |
596 | bool net_byteorder; | |
597 | int r; | |
598 | ||
599 | assert_return(m, -EINVAL); | |
600 | ||
601 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U32); | |
602 | if (r < 0) | |
603 | return r; | |
604 | ||
605 | r = netlink_message_read_internal(m, type, &attr_data, &net_byteorder); | |
606 | if (r < 0) | |
607 | return r; | |
608 | else if ((size_t)r < sizeof(uint32_t)) | |
609 | return -EIO; | |
610 | ||
611 | if (data) { | |
612 | if (net_byteorder) | |
613 | *data = be32toh(*(uint32_t *) attr_data); | |
614 | else | |
615 | *data = *(uint32_t *) attr_data; | |
616 | } | |
617 | ||
618 | return 0; | |
619 | } | |
620 | ||
621 | int sd_netlink_message_read_ether_addr(sd_netlink_message *m, unsigned short type, struct ether_addr *data) { | |
622 | int r; | |
623 | void *attr_data; | |
624 | ||
625 | assert_return(m, -EINVAL); | |
626 | ||
627 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_ETHER_ADDR); | |
628 | if (r < 0) | |
629 | return r; | |
630 | ||
631 | r = netlink_message_read_internal(m, type, &attr_data, NULL); | |
632 | if (r < 0) | |
633 | return r; | |
634 | else if ((size_t)r < sizeof(struct ether_addr)) | |
635 | return -EIO; | |
636 | ||
637 | if (data) | |
638 | memcpy(data, attr_data, sizeof(struct ether_addr)); | |
639 | ||
640 | return 0; | |
641 | } | |
642 | ||
643 | int sd_netlink_message_read_cache_info(sd_netlink_message *m, unsigned short type, struct ifa_cacheinfo *info) { | |
644 | int r; | |
645 | void *attr_data; | |
646 | ||
647 | assert_return(m, -EINVAL); | |
648 | ||
649 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_CACHE_INFO); | |
650 | if (r < 0) | |
651 | return r; | |
652 | ||
653 | r = netlink_message_read_internal(m, type, &attr_data, NULL); | |
654 | if (r < 0) | |
655 | return r; | |
656 | else if ((size_t)r < sizeof(struct ifa_cacheinfo)) | |
657 | return -EIO; | |
658 | ||
659 | if (info) | |
660 | memcpy(info, attr_data, sizeof(struct ifa_cacheinfo)); | |
661 | ||
662 | return 0; | |
663 | } | |
664 | ||
665 | int sd_netlink_message_read_in_addr(sd_netlink_message *m, unsigned short type, struct in_addr *data) { | |
666 | int r; | |
667 | void *attr_data; | |
668 | ||
669 | assert_return(m, -EINVAL); | |
670 | ||
671 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); | |
672 | if (r < 0) | |
673 | return r; | |
674 | ||
675 | r = netlink_message_read_internal(m, type, &attr_data, NULL); | |
676 | if (r < 0) | |
677 | return r; | |
678 | else if ((size_t)r < sizeof(struct in_addr)) | |
679 | return -EIO; | |
680 | ||
681 | if (data) | |
682 | memcpy(data, attr_data, sizeof(struct in_addr)); | |
683 | ||
684 | return 0; | |
685 | } | |
686 | ||
687 | int sd_netlink_message_read_in6_addr(sd_netlink_message *m, unsigned short type, struct in6_addr *data) { | |
688 | int r; | |
689 | void *attr_data; | |
690 | ||
691 | assert_return(m, -EINVAL); | |
692 | ||
693 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); | |
694 | if (r < 0) | |
695 | return r; | |
696 | ||
697 | r = netlink_message_read_internal(m, type, &attr_data, NULL); | |
698 | if (r < 0) | |
699 | return r; | |
700 | else if ((size_t)r < sizeof(struct in6_addr)) | |
701 | return -EIO; | |
702 | ||
703 | if (data) | |
704 | memcpy(data, attr_data, sizeof(struct in6_addr)); | |
705 | ||
706 | return 0; | |
707 | } | |
708 | ||
709 | static int netlink_container_parse(sd_netlink_message *m, | |
710 | struct netlink_container *container, | |
711 | int count, | |
712 | struct rtattr *rta, | |
713 | unsigned int rt_len) { | |
714 | _cleanup_free_ struct netlink_attribute *attributes = NULL; | |
715 | ||
716 | attributes = new0(struct netlink_attribute, count); | |
717 | if(!attributes) | |
718 | return -ENOMEM; | |
719 | ||
720 | for (; RTA_OK(rta, rt_len); rta = RTA_NEXT(rta, rt_len)) { | |
721 | unsigned short type; | |
722 | ||
723 | type = RTA_TYPE(rta); | |
724 | ||
725 | /* if the kernel is newer than the headers we used | |
726 | when building, we ignore out-of-range attributes */ | |
727 | if (type >= count) | |
728 | continue; | |
729 | ||
730 | if (attributes[type].offset) | |
731 | log_debug("rtnl: message parse - overwriting repeated attribute"); | |
732 | ||
733 | attributes[type].offset = (uint8_t *) rta - (uint8_t *) m->hdr; | |
734 | attributes[type].nested = RTA_FLAGS(rta) & NLA_F_NESTED; | |
735 | attributes[type].net_byteorder = RTA_FLAGS(rta) & NLA_F_NET_BYTEORDER; | |
736 | } | |
737 | ||
738 | container->attributes = attributes; | |
739 | attributes = NULL; | |
740 | container->n_attributes = count; | |
741 | ||
742 | return 0; | |
743 | } | |
744 | ||
745 | int sd_netlink_message_enter_container(sd_netlink_message *m, unsigned short type_id) { | |
746 | const NLType *nl_type; | |
747 | const NLTypeSystem *type_system; | |
748 | void *container; | |
749 | uint16_t type; | |
750 | size_t size; | |
751 | int r; | |
752 | ||
753 | assert_return(m, -EINVAL); | |
754 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -EINVAL); | |
755 | ||
756 | r = type_system_get_type(m->containers[m->n_containers].type_system, | |
757 | &nl_type, | |
758 | type_id); | |
759 | if (r < 0) | |
760 | return r; | |
761 | ||
762 | type = type_get_type(nl_type); | |
763 | ||
764 | if (type == NETLINK_TYPE_NESTED) { | |
765 | r = type_system_get_type_system(m->containers[m->n_containers].type_system, | |
766 | &type_system, | |
767 | type_id); | |
768 | if (r < 0) | |
769 | return r; | |
770 | } else if (type == NETLINK_TYPE_UNION) { | |
771 | const NLTypeSystemUnion *type_system_union; | |
772 | ||
773 | r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, | |
774 | &type_system_union, | |
775 | type_id); | |
776 | if (r < 0) | |
777 | return r; | |
778 | ||
779 | switch (type_system_union->match_type) { | |
780 | case NL_MATCH_SIBLING: | |
781 | { | |
782 | const char *key; | |
783 | ||
784 | r = sd_netlink_message_read_string(m, type_system_union->match, &key); | |
785 | if (r < 0) | |
786 | return r; | |
787 | ||
788 | r = type_system_union_get_type_system(type_system_union, | |
789 | &type_system, | |
790 | key); | |
791 | if (r < 0) | |
792 | return r; | |
793 | ||
794 | break; | |
795 | } | |
796 | case NL_MATCH_PROTOCOL: | |
797 | { | |
798 | int family; | |
799 | ||
800 | r = sd_rtnl_message_get_family(m, &family); | |
801 | if (r < 0) | |
802 | return r; | |
803 | ||
804 | r = type_system_union_protocol_get_type_system(type_system_union, | |
805 | &type_system, | |
806 | family); | |
807 | if (r < 0) | |
808 | return r; | |
809 | ||
810 | break; | |
811 | } | |
812 | default: | |
813 | assert_not_reached("sd-netlink: invalid type system union type"); | |
814 | } | |
815 | } else | |
816 | return -EINVAL; | |
817 | ||
818 | r = netlink_message_read_internal(m, type_id, &container, NULL); | |
819 | if (r < 0) | |
820 | return r; | |
821 | else | |
822 | size = (size_t)r; | |
823 | ||
824 | m->n_containers ++; | |
825 | ||
826 | r = netlink_container_parse(m, | |
827 | &m->containers[m->n_containers], | |
828 | type_system_get_count(type_system), | |
829 | container, | |
830 | size); | |
831 | if (r < 0) { | |
832 | m->n_containers --; | |
833 | return r; | |
834 | } | |
835 | ||
836 | m->containers[m->n_containers].type_system = type_system; | |
837 | ||
838 | return 0; | |
839 | } | |
840 | ||
841 | int sd_netlink_message_exit_container(sd_netlink_message *m) { | |
842 | assert_return(m, -EINVAL); | |
843 | assert_return(m->sealed, -EINVAL); | |
844 | assert_return(m->n_containers > 0, -EINVAL); | |
845 | ||
846 | m->containers[m->n_containers].attributes = mfree(m->containers[m->n_containers].attributes); | |
847 | m->containers[m->n_containers].type_system = NULL; | |
848 | ||
849 | m->n_containers --; | |
850 | ||
851 | return 0; | |
852 | } | |
853 | ||
854 | uint32_t rtnl_message_get_serial(sd_netlink_message *m) { | |
855 | assert(m); | |
856 | assert(m->hdr); | |
857 | ||
858 | return m->hdr->nlmsg_seq; | |
859 | } | |
860 | ||
861 | int sd_netlink_message_is_error(sd_netlink_message *m) { | |
862 | assert_return(m, 0); | |
863 | assert_return(m->hdr, 0); | |
864 | ||
865 | return m->hdr->nlmsg_type == NLMSG_ERROR; | |
866 | } | |
867 | ||
868 | int sd_netlink_message_get_errno(sd_netlink_message *m) { | |
869 | struct nlmsgerr *err; | |
870 | ||
871 | assert_return(m, -EINVAL); | |
872 | assert_return(m->hdr, -EINVAL); | |
873 | ||
874 | if (!sd_netlink_message_is_error(m)) | |
875 | return 0; | |
876 | ||
877 | err = NLMSG_DATA(m->hdr); | |
878 | ||
879 | return err->error; | |
880 | } | |
881 | ||
882 | int sd_netlink_message_rewind(sd_netlink_message *m) { | |
883 | const NLType *nl_type; | |
884 | uint16_t type; | |
885 | size_t size; | |
886 | unsigned i; | |
887 | int r; | |
888 | ||
889 | assert_return(m, -EINVAL); | |
890 | ||
891 | /* don't allow appending to message once parsed */ | |
892 | if (!m->sealed) | |
893 | rtnl_message_seal(m); | |
894 | ||
895 | for (i = 1; i <= m->n_containers; i++) { | |
896 | m->containers[i].attributes = mfree(m->containers[i].attributes); | |
897 | } | |
898 | ||
899 | m->n_containers = 0; | |
900 | ||
901 | if (m->containers[0].attributes) | |
902 | /* top-level attributes have already been parsed */ | |
903 | return 0; | |
904 | ||
905 | assert(m->hdr); | |
906 | ||
907 | r = type_system_get_type(&type_system_root, &nl_type, m->hdr->nlmsg_type); | |
908 | if (r < 0) | |
909 | return r; | |
910 | ||
911 | type = type_get_type(nl_type); | |
912 | size = type_get_size(nl_type); | |
913 | ||
914 | if (type == NETLINK_TYPE_NESTED) { | |
915 | const NLTypeSystem *type_system; | |
916 | ||
917 | type_get_type_system(nl_type, &type_system); | |
918 | ||
919 | m->containers[0].type_system = type_system; | |
920 | ||
921 | r = netlink_container_parse(m, | |
922 | &m->containers[m->n_containers], | |
923 | type_system_get_count(type_system), | |
924 | (struct rtattr*)((uint8_t*)NLMSG_DATA(m->hdr) + NLMSG_ALIGN(size)), | |
925 | NLMSG_PAYLOAD(m->hdr, size)); | |
926 | if (r < 0) | |
927 | return r; | |
928 | } | |
929 | ||
930 | return 0; | |
931 | } | |
932 | ||
933 | void rtnl_message_seal(sd_netlink_message *m) { | |
934 | assert(m); | |
935 | assert(!m->sealed); | |
936 | ||
937 | m->sealed = true; | |
938 | } | |
939 | ||
940 | sd_netlink_message *sd_netlink_message_next(sd_netlink_message *m) { | |
941 | assert_return(m, NULL); | |
942 | ||
943 | return m->next; | |
944 | } |