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65f568bb TG |
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> | |
65f568bb TG |
23 | #include <stdbool.h> |
24 | #include <unistd.h> | |
25 | ||
26 | #include "util.h" | |
2ce84835 | 27 | #include "socket-util.h" |
6482f626 | 28 | #include "formats-util.h" |
65f568bb | 29 | #include "refcnt.h" |
d5eff740 | 30 | #include "missing.h" |
65f568bb | 31 | |
1c4baffc TG |
32 | #include "sd-netlink.h" |
33 | #include "netlink-util.h" | |
34 | #include "netlink-internal.h" | |
35 | #include "netlink-types.h" | |
65f568bb | 36 | |
31a4e153 | 37 | #define GET_CONTAINER(m, i) ((i) < (m)->n_containers ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->container_offsets[i]) : NULL) |
e5c4350b | 38 | #define PUSH_CONTAINER(m, new) (m)->container_offsets[(m)->n_containers ++] = (uint8_t*)(new) - (uint8_t*)(m)->hdr; |
4ebe732c | 39 | |
0a2478a9 TG |
40 | #define RTA_TYPE(rta) ((rta)->rta_type & NLA_TYPE_MASK) |
41 | ||
89489ef7 | 42 | int message_new_empty(sd_netlink *rtnl, sd_netlink_message **ret) { |
1c4baffc | 43 | sd_netlink_message *m; |
65f568bb TG |
44 | |
45 | assert_return(ret, -EINVAL); | |
65f568bb | 46 | |
f131770b | 47 | /* Note that 'rtnl' is currently unused, if we start using it internally |
8c578303 | 48 | we must take care to avoid problems due to mutual references between |
ff9b60f3 | 49 | buses and their queued messages. See sd-bus. |
8c578303 TG |
50 | */ |
51 | ||
1c4baffc | 52 | m = new0(sd_netlink_message, 1); |
65f568bb TG |
53 | if (!m) |
54 | return -ENOMEM; | |
55 | ||
65f568bb TG |
56 | m->n_ref = REFCNT_INIT; |
57 | ||
65f568bb TG |
58 | m->sealed = false; |
59 | ||
60 | *ret = m; | |
61 | ||
62 | return 0; | |
63 | } | |
64 | ||
1c4baffc TG |
65 | int message_new(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t type) { |
66 | _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL; | |
d8e538ec TG |
67 | const NLType *nl_type; |
68 | size_t size; | |
69 | int r; | |
70 | ||
71 | r = type_system_get_type(NULL, &nl_type, type); | |
72 | if (r < 0) | |
73 | return r; | |
74 | ||
1b89cf56 | 75 | r = message_new_empty(rtnl, &m); |
d8e538ec TG |
76 | if (r < 0) |
77 | return r; | |
78 | ||
1b89cf56 TG |
79 | size = NLMSG_SPACE(nl_type->size); |
80 | ||
81 | assert(size >= sizeof(struct nlmsghdr)); | |
82 | m->hdr = malloc0(size); | |
83 | if (!m->hdr) | |
84 | return -ENOMEM; | |
85 | ||
86 | m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; | |
87 | ||
88 | m->container_type_system[0] = nl_type->type_system; | |
89 | m->hdr->nlmsg_len = size; | |
90 | m->hdr->nlmsg_type = type; | |
91 | ||
92 | *ret = m; | |
93 | m = NULL; | |
d8e538ec TG |
94 | |
95 | return 0; | |
96 | } | |
97 | ||
1c4baffc | 98 | int sd_netlink_message_request_dump(sd_netlink_message *m, int dump) { |
6e20c8f8 TG |
99 | assert_return(m, -EINVAL); |
100 | assert_return(m->hdr, -EINVAL); | |
20dff6c4 TG |
101 | assert_return(m->hdr->nlmsg_type == RTM_GETLINK || |
102 | m->hdr->nlmsg_type == RTM_GETADDR || | |
103 | m->hdr->nlmsg_type == RTM_GETROUTE || | |
104 | m->hdr->nlmsg_type == RTM_GETNEIGH, | |
6e20c8f8 TG |
105 | -EINVAL); |
106 | ||
107 | if (dump) | |
108 | m->hdr->nlmsg_flags |= NLM_F_DUMP; | |
109 | else | |
110 | m->hdr->nlmsg_flags &= ~NLM_F_DUMP; | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
1c4baffc | 115 | sd_netlink_message *sd_netlink_message_ref(sd_netlink_message *m) { |
65f568bb TG |
116 | if (m) |
117 | assert_se(REFCNT_INC(m->n_ref) >= 2); | |
118 | ||
119 | return m; | |
120 | } | |
121 | ||
1c4baffc | 122 | sd_netlink_message *sd_netlink_message_unref(sd_netlink_message *m) { |
f0c4b1c3 | 123 | if (m && REFCNT_DEC(m->n_ref) == 0) { |
3dd215e0 TG |
124 | unsigned i; |
125 | ||
65f568bb | 126 | free(m->hdr); |
3dd215e0 | 127 | |
9f5bbfe3 | 128 | for (i = 0; i <= m->n_containers; i++) |
3dd215e0 TG |
129 | free(m->rta_offset_tb[i]); |
130 | ||
1c4baffc | 131 | sd_netlink_message_unref(m->next); |
1403f45a | 132 | |
65f568bb TG |
133 | free(m); |
134 | } | |
135 | ||
136 | return NULL; | |
137 | } | |
138 | ||
1c4baffc | 139 | int sd_netlink_message_get_type(sd_netlink_message *m, uint16_t *type) { |
65f568bb TG |
140 | assert_return(m, -EINVAL); |
141 | assert_return(type, -EINVAL); | |
142 | ||
143 | *type = m->hdr->nlmsg_type; | |
144 | ||
145 | return 0; | |
146 | } | |
147 | ||
1c4baffc | 148 | int sd_netlink_message_is_broadcast(sd_netlink_message *m) { |
1f0db3ed TG |
149 | assert_return(m, -EINVAL); |
150 | ||
3f42446d | 151 | return m->broadcast; |
1f0db3ed TG |
152 | } |
153 | ||
4ebe732c ZJS |
154 | /* If successful the updated message will be correctly aligned, if |
155 | unsuccessful the old message is untouched. */ | |
1c4baffc | 156 | static int add_rtattr(sd_netlink_message *m, unsigned short type, const void *data, size_t data_length) { |
7ca1d319 TG |
157 | uint32_t rta_length; |
158 | size_t message_length, padding_length; | |
65f568bb TG |
159 | struct nlmsghdr *new_hdr; |
160 | struct rtattr *rta; | |
8e337e64 | 161 | char *padding; |
5a081409 | 162 | unsigned i; |
7ca1d319 | 163 | int offset; |
65f568bb | 164 | |
33125ac5 TG |
165 | assert(m); |
166 | assert(m->hdr); | |
e5c4350b | 167 | assert(!m->sealed); |
33125ac5 | 168 | assert(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len); |
7ca1d319 TG |
169 | assert(!data || data_length); |
170 | ||
171 | /* get offset of the new attribute */ | |
172 | offset = m->hdr->nlmsg_len; | |
65f568bb | 173 | |
8e337e64 | 174 | /* get the size of the new rta attribute (with padding at the end) */ |
65f568bb | 175 | rta_length = RTA_LENGTH(data_length); |
4ebe732c ZJS |
176 | |
177 | /* get the new message size (with padding at the end) */ | |
7ca1d319 | 178 | message_length = offset + RTA_ALIGN(rta_length); |
65f568bb TG |
179 | |
180 | /* realloc to fit the new attribute */ | |
181 | new_hdr = realloc(m->hdr, message_length); | |
182 | if (!new_hdr) | |
183 | return -ENOMEM; | |
184 | m->hdr = new_hdr; | |
185 | ||
186 | /* get pointer to the attribute we are about to add */ | |
7ca1d319 | 187 | rta = (struct rtattr *) ((uint8_t *) m->hdr + offset); |
65f568bb | 188 | |
5a081409 TG |
189 | /* if we are inside containers, extend them */ |
190 | for (i = 0; i < m->n_containers; i++) | |
7ca1d319 | 191 | GET_CONTAINER(m, i)->rta_len += message_length - offset; |
33125ac5 | 192 | |
65f568bb TG |
193 | /* fill in the attribute */ |
194 | rta->rta_type = type; | |
195 | rta->rta_len = rta_length; | |
7ca1d319 | 196 | if (data) |
33125ac5 TG |
197 | /* we don't deal with the case where the user lies about the type |
198 | * and gives us too little data (so don't do that) | |
7ca1d319 | 199 | */ |
33125ac5 | 200 | padding = mempcpy(RTA_DATA(rta), data, data_length); |
7ca1d319 TG |
201 | else { |
202 | /* if no data was passed, make sure we still initialize the padding | |
203 | note that we can have data_length > 0 (used by some containers) */ | |
204 | padding = RTA_DATA(rta); | |
33125ac5 | 205 | } |
65f568bb | 206 | |
7ca1d319 TG |
207 | /* make sure also the padding at the end of the message is initialized */ |
208 | padding_length = (uint8_t*)m->hdr + message_length - (uint8_t*)padding; | |
209 | memzero(padding, padding_length); | |
210 | ||
4ebe732c ZJS |
211 | /* update message size */ |
212 | m->hdr->nlmsg_len = message_length; | |
213 | ||
7ca1d319 | 214 | return offset; |
65f568bb TG |
215 | } |
216 | ||
1c4baffc | 217 | static int message_attribute_has_type(sd_netlink_message *m, uint16_t attribute_type, uint16_t data_type) { |
d8e538ec TG |
218 | const NLType *type; |
219 | int r; | |
220 | ||
221 | r = type_system_get_type(m->container_type_system[m->n_containers], &type, attribute_type); | |
222 | if (r < 0) | |
223 | return r; | |
224 | ||
225 | if (type->type != data_type) | |
226 | return -EINVAL; | |
227 | ||
228 | return type->size; | |
229 | } | |
230 | ||
1c4baffc | 231 | int sd_netlink_message_append_string(sd_netlink_message *m, unsigned short type, const char *data) { |
d8e538ec | 232 | size_t length, size; |
0a0dc69b | 233 | int r; |
65f568bb TG |
234 | |
235 | assert_return(m, -EINVAL); | |
e5c4350b | 236 | assert_return(!m->sealed, -EPERM); |
65f568bb TG |
237 | assert_return(data, -EINVAL); |
238 | ||
cafbc790 | 239 | r = message_attribute_has_type(m, type, NETLINK_TYPE_STRING); |
0a0dc69b TG |
240 | if (r < 0) |
241 | return r; | |
d8e538ec TG |
242 | else |
243 | size = (size_t)r; | |
65f568bb | 244 | |
d8e538ec | 245 | if (size) { |
3072eecf LP |
246 | length = strnlen(data, size+1); |
247 | if (length > size) | |
d8e538ec TG |
248 | return -EINVAL; |
249 | } else | |
250 | length = strlen(data); | |
33125ac5 | 251 | |
d8e538ec | 252 | r = add_rtattr(m, type, data, length + 1); |
0a0dc69b TG |
253 | if (r < 0) |
254 | return r; | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
1c4baffc | 259 | int sd_netlink_message_append_u8(sd_netlink_message *m, unsigned short type, uint8_t data) { |
7b179640 SS |
260 | int r; |
261 | ||
262 | assert_return(m, -EINVAL); | |
263 | assert_return(!m->sealed, -EPERM); | |
264 | ||
cafbc790 | 265 | r = message_attribute_has_type(m, type, NETLINK_TYPE_U8); |
7b179640 SS |
266 | if (r < 0) |
267 | return r; | |
268 | ||
7b179640 SS |
269 | r = add_rtattr(m, type, &data, sizeof(uint8_t)); |
270 | if (r < 0) | |
271 | return r; | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | ||
1c4baffc | 277 | int sd_netlink_message_append_u16(sd_netlink_message *m, unsigned short type, uint16_t data) { |
01b36069 TG |
278 | int r; |
279 | ||
280 | assert_return(m, -EINVAL); | |
e5c4350b | 281 | assert_return(!m->sealed, -EPERM); |
01b36069 | 282 | |
cafbc790 | 283 | r = message_attribute_has_type(m, type, NETLINK_TYPE_U16); |
01b36069 TG |
284 | if (r < 0) |
285 | return r; | |
286 | ||
01b36069 TG |
287 | r = add_rtattr(m, type, &data, sizeof(uint16_t)); |
288 | if (r < 0) | |
289 | return r; | |
290 | ||
291 | return 0; | |
292 | } | |
293 | ||
1c4baffc | 294 | int sd_netlink_message_append_u32(sd_netlink_message *m, unsigned short type, uint32_t data) { |
0a0dc69b TG |
295 | int r; |
296 | ||
297 | assert_return(m, -EINVAL); | |
e5c4350b | 298 | assert_return(!m->sealed, -EPERM); |
0a0dc69b | 299 | |
cafbc790 | 300 | r = message_attribute_has_type(m, type, NETLINK_TYPE_U32); |
0a0dc69b TG |
301 | if (r < 0) |
302 | return r; | |
303 | ||
4d47756b | 304 | r = add_rtattr(m, type, &data, sizeof(uint32_t)); |
0a0dc69b TG |
305 | if (r < 0) |
306 | return r; | |
307 | ||
308 | return 0; | |
309 | } | |
310 | ||
1c4baffc | 311 | int sd_netlink_message_append_in_addr(sd_netlink_message *m, unsigned short type, const struct in_addr *data) { |
0a0dc69b TG |
312 | int r; |
313 | ||
314 | assert_return(m, -EINVAL); | |
e5c4350b | 315 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
316 | assert_return(data, -EINVAL); |
317 | ||
cafbc790 | 318 | r = message_attribute_has_type(m, type, NETLINK_TYPE_IN_ADDR); |
0a0dc69b TG |
319 | if (r < 0) |
320 | return r; | |
321 | ||
4d47756b | 322 | r = add_rtattr(m, type, data, sizeof(struct in_addr)); |
0a0dc69b TG |
323 | if (r < 0) |
324 | return r; | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
1c4baffc | 329 | int sd_netlink_message_append_in6_addr(sd_netlink_message *m, unsigned short type, const struct in6_addr *data) { |
0a0dc69b TG |
330 | int r; |
331 | ||
332 | assert_return(m, -EINVAL); | |
e5c4350b | 333 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
334 | assert_return(data, -EINVAL); |
335 | ||
cafbc790 | 336 | r = message_attribute_has_type(m, type, NETLINK_TYPE_IN_ADDR); |
0a0dc69b TG |
337 | if (r < 0) |
338 | return r; | |
339 | ||
4d47756b | 340 | r = add_rtattr(m, type, data, sizeof(struct in6_addr)); |
0a0dc69b TG |
341 | if (r < 0) |
342 | return r; | |
343 | ||
344 | return 0; | |
345 | } | |
346 | ||
1c4baffc | 347 | int sd_netlink_message_append_ether_addr(sd_netlink_message *m, unsigned short type, const struct ether_addr *data) { |
0a0dc69b TG |
348 | int r; |
349 | ||
350 | assert_return(m, -EINVAL); | |
e5c4350b | 351 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
352 | assert_return(data, -EINVAL); |
353 | ||
cafbc790 | 354 | r = message_attribute_has_type(m, type, NETLINK_TYPE_ETHER_ADDR); |
d8e538ec TG |
355 | if (r < 0) |
356 | return r; | |
0a0dc69b | 357 | |
b9eaf3d1 | 358 | r = add_rtattr(m, type, data, ETH_ALEN); |
0a0dc69b TG |
359 | if (r < 0) |
360 | return r; | |
361 | ||
362 | return 0; | |
65f568bb TG |
363 | } |
364 | ||
1c4baffc | 365 | int sd_netlink_message_append_cache_info(sd_netlink_message *m, unsigned short type, const struct ifa_cacheinfo *info) { |
aba496a5 UTL |
366 | int r; |
367 | ||
368 | assert_return(m, -EINVAL); | |
369 | assert_return(!m->sealed, -EPERM); | |
370 | assert_return(info, -EINVAL); | |
371 | ||
cafbc790 | 372 | r = message_attribute_has_type(m, type, NETLINK_TYPE_CACHE_INFO); |
aba496a5 UTL |
373 | if (r < 0) |
374 | return r; | |
375 | ||
376 | r = add_rtattr(m, type, info, sizeof(struct ifa_cacheinfo)); | |
377 | if (r < 0) | |
378 | return r; | |
379 | ||
380 | return 0; | |
381 | } | |
382 | ||
1c4baffc | 383 | int sd_netlink_message_open_container(sd_netlink_message *m, unsigned short type) { |
d8e538ec TG |
384 | size_t size; |
385 | int r; | |
33125ac5 | 386 | |
65f568bb | 387 | assert_return(m, -EINVAL); |
e5c4350b | 388 | assert_return(!m->sealed, -EPERM); |
7ca1d319 | 389 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -ERANGE); |
33125ac5 | 390 | |
cafbc790 | 391 | r = message_attribute_has_type(m, type, NETLINK_TYPE_NESTED); |
4af7b60d TG |
392 | if (r < 0) { |
393 | const NLTypeSystemUnion *type_system_union; | |
394 | int family; | |
395 | ||
cafbc790 | 396 | r = message_attribute_has_type(m, type, NETLINK_TYPE_UNION); |
4af7b60d TG |
397 | if (r < 0) |
398 | return r; | |
399 | size = (size_t) r; | |
400 | ||
89489ef7 | 401 | r = sd_rtnl_message_get_family(m, &family); |
4af7b60d TG |
402 | if (r < 0) |
403 | return r; | |
404 | ||
405 | r = type_system_get_type_system_union(m->container_type_system[m->n_containers], &type_system_union, type); | |
406 | if (r < 0) | |
407 | return r; | |
408 | ||
409 | r = type_system_union_protocol_get_type_system(type_system_union, | |
410 | &m->container_type_system[m->n_containers + 1], | |
411 | family); | |
412 | if (r < 0) | |
413 | return r; | |
414 | } else { | |
d8e538ec | 415 | size = (size_t)r; |
33125ac5 | 416 | |
4af7b60d TG |
417 | r = type_system_get_type_system(m->container_type_system[m->n_containers], |
418 | &m->container_type_system[m->n_containers + 1], | |
419 | type); | |
420 | if (r < 0) | |
421 | return r; | |
422 | } | |
31a4e153 | 423 | |
fcf81a54 | 424 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, size); |
d8e538ec TG |
425 | if (r < 0) |
426 | return r; | |
427 | ||
7ca1d319 TG |
428 | m->container_offsets[m->n_containers ++] = r; |
429 | ||
d8e538ec TG |
430 | return 0; |
431 | } | |
432 | ||
1c4baffc | 433 | int sd_netlink_message_open_container_union(sd_netlink_message *m, unsigned short type, const char *key) { |
d8e538ec TG |
434 | const NLTypeSystemUnion *type_system_union; |
435 | int r; | |
436 | ||
437 | assert_return(m, -EINVAL); | |
438 | assert_return(!m->sealed, -EPERM); | |
439 | ||
440 | r = type_system_get_type_system_union(m->container_type_system[m->n_containers], &type_system_union, type); | |
441 | if (r < 0) | |
442 | return r; | |
443 | ||
444 | r = type_system_union_get_type_system(type_system_union, | |
445 | &m->container_type_system[m->n_containers + 1], | |
446 | key); | |
447 | if (r < 0) | |
448 | return r; | |
33125ac5 | 449 | |
1c4baffc | 450 | r = sd_netlink_message_append_string(m, type_system_union->match, key); |
d8e538ec TG |
451 | if (r < 0) |
452 | return r; | |
453 | ||
454 | /* do we evere need non-null size */ | |
455 | r = add_rtattr(m, type, NULL, 0); | |
456 | if (r < 0) | |
457 | return r; | |
458 | ||
7ca1d319 TG |
459 | m->container_offsets[m->n_containers ++] = r; |
460 | ||
d8e538ec | 461 | return 0; |
33125ac5 TG |
462 | } |
463 | ||
d8e538ec | 464 | |
1c4baffc | 465 | int sd_netlink_message_close_container(sd_netlink_message *m) { |
33125ac5 | 466 | assert_return(m, -EINVAL); |
e5c4350b | 467 | assert_return(!m->sealed, -EPERM); |
5a081409 | 468 | assert_return(m->n_containers > 0, -EINVAL); |
33125ac5 | 469 | |
d8e538ec | 470 | m->container_type_system[m->n_containers] = NULL; |
5a081409 | 471 | m->n_containers --; |
33125ac5 TG |
472 | |
473 | return 0; | |
474 | } | |
475 | ||
1c4baffc | 476 | int rtnl_message_read_internal(sd_netlink_message *m, unsigned short type, void **data) { |
f66eeb6b TG |
477 | struct rtattr *rta; |
478 | ||
44caa5e7 SS |
479 | assert_return(m, -EINVAL); |
480 | assert_return(m->sealed, -EPERM); | |
481 | assert_return(data, -EINVAL); | |
d8e538ec TG |
482 | assert(m->n_containers <= RTNL_CONTAINER_DEPTH); |
483 | assert(m->rta_offset_tb[m->n_containers]); | |
484 | assert(type < m->rta_tb_size[m->n_containers]); | |
44caa5e7 | 485 | |
3dd215e0 | 486 | if(!m->rta_offset_tb[m->n_containers][type]) |
44caa5e7 SS |
487 | return -ENODATA; |
488 | ||
3dd215e0 | 489 | rta = (struct rtattr*)((uint8_t *) m->hdr + m->rta_offset_tb[m->n_containers][type]); |
44caa5e7 | 490 | |
f66eeb6b TG |
491 | *data = RTA_DATA(rta); |
492 | ||
493 | return RTA_PAYLOAD(rta); | |
44caa5e7 SS |
494 | } |
495 | ||
1c4baffc | 496 | int sd_netlink_message_read_string(sd_netlink_message *m, unsigned short type, const char **data) { |
44caa5e7 SS |
497 | int r; |
498 | void *attr_data; | |
499 | ||
73ae2b7d TG |
500 | assert_return(m, -EINVAL); |
501 | ||
cafbc790 | 502 | r = message_attribute_has_type(m, type, NETLINK_TYPE_STRING); |
d8e538ec TG |
503 | if (r < 0) |
504 | return r; | |
44caa5e7 SS |
505 | |
506 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 507 | if (r < 0) |
44caa5e7 | 508 | return r; |
f66eeb6b TG |
509 | else if (strnlen(attr_data, r) >= (size_t) r) |
510 | return -EIO; | |
44caa5e7 | 511 | |
73ae2b7d TG |
512 | if (data) |
513 | *data = (const char *) attr_data; | |
44caa5e7 SS |
514 | |
515 | return 0; | |
516 | } | |
517 | ||
1c4baffc | 518 | int sd_netlink_message_read_u8(sd_netlink_message *m, unsigned short type, uint8_t *data) { |
44caa5e7 SS |
519 | int r; |
520 | void *attr_data; | |
521 | ||
73ae2b7d TG |
522 | assert_return(m, -EINVAL); |
523 | ||
cafbc790 | 524 | r = message_attribute_has_type(m, type, NETLINK_TYPE_U8); |
d8e538ec TG |
525 | if (r < 0) |
526 | return r; | |
44caa5e7 SS |
527 | |
528 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 529 | if (r < 0) |
44caa5e7 | 530 | return r; |
f66eeb6b TG |
531 | else if ((size_t) r < sizeof(uint8_t)) |
532 | return -EIO; | |
44caa5e7 | 533 | |
73ae2b7d TG |
534 | if (data) |
535 | *data = *(uint8_t *) attr_data; | |
44caa5e7 SS |
536 | |
537 | return 0; | |
538 | } | |
539 | ||
1c4baffc | 540 | int sd_netlink_message_read_u16(sd_netlink_message *m, unsigned short type, uint16_t *data) { |
44caa5e7 SS |
541 | int r; |
542 | void *attr_data; | |
543 | ||
73ae2b7d TG |
544 | assert_return(m, -EINVAL); |
545 | ||
cafbc790 | 546 | r = message_attribute_has_type(m, type, NETLINK_TYPE_U16); |
d8e538ec TG |
547 | if (r < 0) |
548 | return r; | |
44caa5e7 SS |
549 | |
550 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 551 | if (r < 0) |
44caa5e7 | 552 | return r; |
f66eeb6b TG |
553 | else if ((size_t) r < sizeof(uint16_t)) |
554 | return -EIO; | |
44caa5e7 | 555 | |
73ae2b7d TG |
556 | if (data) |
557 | *data = *(uint16_t *) attr_data; | |
44caa5e7 SS |
558 | |
559 | return 0; | |
560 | } | |
561 | ||
1c4baffc | 562 | int sd_netlink_message_read_u32(sd_netlink_message *m, unsigned short type, uint32_t *data) { |
44caa5e7 SS |
563 | int r; |
564 | void *attr_data; | |
565 | ||
73ae2b7d TG |
566 | assert_return(m, -EINVAL); |
567 | ||
cafbc790 | 568 | r = message_attribute_has_type(m, type, NETLINK_TYPE_U32); |
d8e538ec TG |
569 | if (r < 0) |
570 | return r; | |
44caa5e7 SS |
571 | |
572 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 573 | if (r < 0) |
44caa5e7 | 574 | return r; |
f66eeb6b TG |
575 | else if ((size_t)r < sizeof(uint32_t)) |
576 | return -EIO; | |
44caa5e7 | 577 | |
73ae2b7d TG |
578 | if (data) |
579 | *data = *(uint32_t *) attr_data; | |
44caa5e7 SS |
580 | |
581 | return 0; | |
582 | } | |
583 | ||
1c4baffc | 584 | int sd_netlink_message_read_ether_addr(sd_netlink_message *m, unsigned short type, struct ether_addr *data) { |
4e9e7f18 SS |
585 | int r; |
586 | void *attr_data; | |
587 | ||
73ae2b7d TG |
588 | assert_return(m, -EINVAL); |
589 | ||
cafbc790 | 590 | r = message_attribute_has_type(m, type, NETLINK_TYPE_ETHER_ADDR); |
d8e538ec TG |
591 | if (r < 0) |
592 | return r; | |
4e9e7f18 SS |
593 | |
594 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 595 | if (r < 0) |
4e9e7f18 | 596 | return r; |
f66eeb6b TG |
597 | else if ((size_t)r < sizeof(struct ether_addr)) |
598 | return -EIO; | |
4e9e7f18 | 599 | |
73ae2b7d TG |
600 | if (data) |
601 | memcpy(data, attr_data, sizeof(struct ether_addr)); | |
4e9e7f18 SS |
602 | |
603 | return 0; | |
604 | } | |
605 | ||
1c4baffc | 606 | int sd_netlink_message_read_cache_info(sd_netlink_message *m, unsigned short type, struct ifa_cacheinfo *info) { |
aba496a5 UTL |
607 | int r; |
608 | void *attr_data; | |
609 | ||
73ae2b7d TG |
610 | assert_return(m, -EINVAL); |
611 | ||
cafbc790 | 612 | r = message_attribute_has_type(m, type, NETLINK_TYPE_CACHE_INFO); |
aba496a5 UTL |
613 | if (r < 0) |
614 | return r; | |
615 | ||
616 | r = rtnl_message_read_internal(m, type, &attr_data); | |
617 | if (r < 0) | |
618 | return r; | |
619 | else if ((size_t)r < sizeof(struct ifa_cacheinfo)) | |
620 | return -EIO; | |
621 | ||
73ae2b7d TG |
622 | if (info) |
623 | memcpy(info, attr_data, sizeof(struct ifa_cacheinfo)); | |
aba496a5 UTL |
624 | |
625 | return 0; | |
626 | } | |
627 | ||
1c4baffc | 628 | int sd_netlink_message_read_in_addr(sd_netlink_message *m, unsigned short type, struct in_addr *data) { |
4e9e7f18 SS |
629 | int r; |
630 | void *attr_data; | |
631 | ||
73ae2b7d TG |
632 | assert_return(m, -EINVAL); |
633 | ||
cafbc790 | 634 | r = message_attribute_has_type(m, type, NETLINK_TYPE_IN_ADDR); |
d8e538ec TG |
635 | if (r < 0) |
636 | return r; | |
4e9e7f18 SS |
637 | |
638 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 639 | if (r < 0) |
4e9e7f18 | 640 | return r; |
f66eeb6b TG |
641 | else if ((size_t)r < sizeof(struct in_addr)) |
642 | return -EIO; | |
4e9e7f18 | 643 | |
73ae2b7d TG |
644 | if (data) |
645 | memcpy(data, attr_data, sizeof(struct in_addr)); | |
4e9e7f18 SS |
646 | |
647 | return 0; | |
648 | } | |
649 | ||
1c4baffc | 650 | int sd_netlink_message_read_in6_addr(sd_netlink_message *m, unsigned short type, struct in6_addr *data) { |
4e9e7f18 SS |
651 | int r; |
652 | void *attr_data; | |
653 | ||
73ae2b7d TG |
654 | assert_return(m, -EINVAL); |
655 | ||
cafbc790 | 656 | r = message_attribute_has_type(m, type, NETLINK_TYPE_IN_ADDR); |
d8e538ec TG |
657 | if (r < 0) |
658 | return r; | |
4e9e7f18 SS |
659 | |
660 | r = rtnl_message_read_internal(m, type, &attr_data); | |
3dd215e0 | 661 | if (r < 0) |
4e9e7f18 | 662 | return r; |
3dd215e0 TG |
663 | else if ((size_t)r < sizeof(struct in6_addr)) |
664 | return -EIO; | |
4e9e7f18 | 665 | |
73ae2b7d TG |
666 | if (data) |
667 | memcpy(data, attr_data, sizeof(struct in6_addr)); | |
4e9e7f18 SS |
668 | |
669 | return 0; | |
670 | } | |
671 | ||
1c4baffc | 672 | int sd_netlink_message_enter_container(sd_netlink_message *m, unsigned short type) { |
d8e538ec TG |
673 | const NLType *nl_type; |
674 | const NLTypeSystem *type_system; | |
3dd215e0 | 675 | void *container; |
d8e538ec TG |
676 | size_t size; |
677 | int r; | |
3dd215e0 TG |
678 | |
679 | assert_return(m, -EINVAL); | |
680 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -EINVAL); | |
681 | ||
d8e538ec TG |
682 | r = type_system_get_type(m->container_type_system[m->n_containers], |
683 | &nl_type, | |
684 | type); | |
3dd215e0 TG |
685 | if (r < 0) |
686 | return r; | |
3dd215e0 | 687 | |
cafbc790 | 688 | if (nl_type->type == NETLINK_TYPE_NESTED) { |
d8e538ec TG |
689 | r = type_system_get_type_system(m->container_type_system[m->n_containers], |
690 | &type_system, | |
691 | type); | |
692 | if (r < 0) | |
693 | return r; | |
cafbc790 | 694 | } else if (nl_type->type == NETLINK_TYPE_UNION) { |
d8e538ec | 695 | const NLTypeSystemUnion *type_system_union; |
d8e538ec TG |
696 | |
697 | r = type_system_get_type_system_union(m->container_type_system[m->n_containers], | |
698 | &type_system_union, | |
699 | type); | |
700 | if (r < 0) | |
701 | return r; | |
702 | ||
4af7b60d TG |
703 | switch (type_system_union->match_type) { |
704 | case NL_MATCH_SIBLING: | |
705 | { | |
706 | const char *key; | |
707 | ||
1c4baffc | 708 | r = sd_netlink_message_read_string(m, type_system_union->match, &key); |
4af7b60d TG |
709 | if (r < 0) |
710 | return r; | |
711 | ||
712 | r = type_system_union_get_type_system(type_system_union, | |
713 | &type_system, | |
714 | key); | |
715 | if (r < 0) | |
716 | return r; | |
717 | ||
718 | break; | |
719 | } | |
720 | case NL_MATCH_PROTOCOL: | |
721 | { | |
722 | int family; | |
723 | ||
89489ef7 | 724 | r = sd_rtnl_message_get_family(m, &family); |
4af7b60d TG |
725 | if (r < 0) |
726 | return r; | |
727 | ||
728 | r = type_system_union_protocol_get_type_system(type_system_union, | |
729 | &type_system, | |
730 | family); | |
731 | if (r < 0) | |
732 | return r; | |
733 | ||
734 | break; | |
735 | } | |
736 | default: | |
1c4baffc | 737 | assert_not_reached("sd-netlink: invalid type system union type"); |
4af7b60d | 738 | } |
d8e538ec TG |
739 | } else |
740 | return -EINVAL; | |
741 | ||
742 | r = rtnl_message_read_internal(m, type, &container); | |
3dd215e0 TG |
743 | if (r < 0) |
744 | return r; | |
d8e538ec TG |
745 | else |
746 | size = (size_t)r; | |
3dd215e0 | 747 | |
d8e538ec | 748 | m->n_containers ++; |
3dd215e0 TG |
749 | |
750 | r = rtnl_message_parse(m, | |
d8e538ec TG |
751 | &m->rta_offset_tb[m->n_containers], |
752 | &m->rta_tb_size[m->n_containers], | |
753 | type_system->max, | |
3dd215e0 | 754 | container, |
d8e538ec TG |
755 | size); |
756 | if (r < 0) { | |
757 | m->n_containers --; | |
3dd215e0 | 758 | return r; |
d8e538ec | 759 | } |
3dd215e0 | 760 | |
d8e538ec | 761 | m->container_type_system[m->n_containers] = type_system; |
3dd215e0 TG |
762 | |
763 | return 0; | |
764 | } | |
765 | ||
1c4baffc | 766 | int sd_netlink_message_exit_container(sd_netlink_message *m) { |
e5c4350b TG |
767 | assert_return(m, -EINVAL); |
768 | assert_return(m->sealed, -EINVAL); | |
769 | assert_return(m->n_containers > 0, -EINVAL); | |
770 | ||
3dd215e0 TG |
771 | free(m->rta_offset_tb[m->n_containers]); |
772 | m->rta_offset_tb[m->n_containers] = NULL; | |
d8e538ec | 773 | m->container_type_system[m->n_containers] = NULL; |
3dd215e0 | 774 | |
e5c4350b TG |
775 | m->n_containers --; |
776 | ||
777 | return 0; | |
778 | } | |
779 | ||
1c4baffc | 780 | uint32_t rtnl_message_get_serial(sd_netlink_message *m) { |
65f568bb | 781 | assert(m); |
9d0db178 | 782 | assert(m->hdr); |
65f568bb TG |
783 | |
784 | return m->hdr->nlmsg_seq; | |
785 | } | |
786 | ||
1c4baffc | 787 | int sd_netlink_message_is_error(sd_netlink_message *m) { |
45af44d4 TG |
788 | assert_return(m, 0); |
789 | assert_return(m->hdr, 0); | |
790 | ||
791 | return m->hdr->nlmsg_type == NLMSG_ERROR; | |
792 | } | |
793 | ||
1c4baffc | 794 | int sd_netlink_message_get_errno(sd_netlink_message *m) { |
65f568bb TG |
795 | struct nlmsgerr *err; |
796 | ||
e16bcf98 | 797 | assert_return(m, -EINVAL); |
9d0db178 | 798 | assert_return(m->hdr, -EINVAL); |
65f568bb | 799 | |
1c4baffc | 800 | if (!sd_netlink_message_is_error(m)) |
65f568bb TG |
801 | return 0; |
802 | ||
803 | err = NLMSG_DATA(m->hdr); | |
804 | ||
805 | return err->error; | |
806 | } | |
807 | ||
1c4baffc | 808 | int rtnl_message_parse(sd_netlink_message *m, |
44caa5e7 SS |
809 | size_t **rta_offset_tb, |
810 | unsigned short *rta_tb_size, | |
811 | int max, | |
812 | struct rtattr *rta, | |
813 | unsigned int rt_len) { | |
e634cd40 | 814 | unsigned short type; |
44caa5e7 SS |
815 | size_t *tb; |
816 | ||
c8a7165f | 817 | tb = new0(size_t, max + 1); |
44caa5e7 SS |
818 | if(!tb) |
819 | return -ENOMEM; | |
820 | ||
c8a7165f | 821 | *rta_tb_size = max + 1; |
44caa5e7 SS |
822 | |
823 | for (; RTA_OK(rta, rt_len); rta = RTA_NEXT(rta, rt_len)) { | |
0a2478a9 | 824 | type = RTA_TYPE(rta); |
44caa5e7 | 825 | |
aef0768e TG |
826 | /* if the kernel is newer than the headers we used |
827 | when building, we ignore out-of-range attributes | |
828 | */ | |
829 | if (type > max) | |
e634cd40 | 830 | continue; |
e634cd40 TG |
831 | |
832 | if (tb[type]) | |
833 | log_debug("rtnl: message parse - overwriting repeated attribute"); | |
834 | ||
835 | tb[type] = (uint8_t *) rta - (uint8_t *) m->hdr; | |
44caa5e7 SS |
836 | } |
837 | ||
838 | *rta_offset_tb = tb; | |
839 | ||
840 | return 0; | |
841 | } | |
842 | ||
1c4baffc | 843 | int sd_netlink_message_rewind(sd_netlink_message *m) { |
d8e538ec | 844 | const NLType *type; |
3dd215e0 TG |
845 | unsigned i; |
846 | int r; | |
0fc7531b TG |
847 | |
848 | assert_return(m, -EINVAL); | |
0fc7531b | 849 | |
3dd215e0 TG |
850 | /* don't allow appending to message once parsed */ |
851 | if (!m->sealed) | |
852 | rtnl_message_seal(m); | |
853 | ||
854 | for (i = 1; i <= m->n_containers; i++) { | |
855 | free(m->rta_offset_tb[i]); | |
856 | m->rta_offset_tb[i] = NULL; | |
857 | m->rta_tb_size[i] = 0; | |
d8e538ec | 858 | m->container_type_system[i] = NULL; |
3dd215e0 TG |
859 | } |
860 | ||
861 | m->n_containers = 0; | |
862 | ||
863 | if (m->rta_offset_tb[0]) { | |
864 | /* top-level attributes have already been parsed */ | |
865 | return 0; | |
866 | } | |
867 | ||
d8e538ec TG |
868 | assert(m->hdr); |
869 | ||
870 | r = type_system_get_type(NULL, &type, m->hdr->nlmsg_type); | |
871 | if (r < 0) | |
872 | return r; | |
873 | ||
cafbc790 | 874 | if (type->type == NETLINK_TYPE_NESTED) { |
d8e538ec TG |
875 | const NLTypeSystem *type_system = type->type_system; |
876 | ||
877 | assert(type_system); | |
878 | ||
879 | m->container_type_system[0] = type_system; | |
880 | ||
881 | r = rtnl_message_parse(m, | |
882 | &m->rta_offset_tb[m->n_containers], | |
883 | &m->rta_tb_size[m->n_containers], | |
884 | type_system->max, | |
0834ff93 TG |
885 | (struct rtattr*)((uint8_t*)NLMSG_DATA(m->hdr) + |
886 | NLMSG_ALIGN(type->size)), | |
d8e538ec TG |
887 | NLMSG_PAYLOAD(m->hdr, type->size)); |
888 | if (r < 0) | |
889 | return r; | |
0fc7531b TG |
890 | } |
891 | ||
892 | return 0; | |
893 | } | |
3dd215e0 | 894 | |
1c4baffc | 895 | void rtnl_message_seal(sd_netlink_message *m) { |
3dd215e0 TG |
896 | assert(m); |
897 | assert(!m->sealed); | |
898 | ||
899 | m->sealed = true; | |
900 | } | |
1403f45a | 901 | |
1c4baffc | 902 | sd_netlink_message *sd_netlink_message_next(sd_netlink_message *m) { |
1403f45a TG |
903 | assert_return(m, NULL); |
904 | ||
905 | return m->next; | |
906 | } |