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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 | ||
846a6b3d | 71 | r = type_system_get_type(&type_system_root, &nl_type, type); |
d8e538ec TG |
72 | if (r < 0) |
73 | return r; | |
74 | ||
12b7dff4 DH |
75 | if (type_get_type(nl_type) != NETLINK_TYPE_NESTED) |
76 | return -EINVAL; | |
77 | ||
1b89cf56 | 78 | r = message_new_empty(rtnl, &m); |
d8e538ec TG |
79 | if (r < 0) |
80 | return r; | |
81 | ||
817d1cd8 | 82 | size = NLMSG_SPACE(type_get_size(nl_type)); |
1b89cf56 TG |
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 | ||
12b7dff4 | 91 | type_get_type_system(nl_type, &m->container_type_system[0]); |
1b89cf56 TG |
92 | m->hdr->nlmsg_len = size; |
93 | m->hdr->nlmsg_type = type; | |
94 | ||
95 | *ret = m; | |
96 | m = NULL; | |
d8e538ec TG |
97 | |
98 | return 0; | |
99 | } | |
100 | ||
1c4baffc | 101 | int sd_netlink_message_request_dump(sd_netlink_message *m, int dump) { |
6e20c8f8 TG |
102 | assert_return(m, -EINVAL); |
103 | assert_return(m->hdr, -EINVAL); | |
20dff6c4 TG |
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, | |
6e20c8f8 TG |
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 | ||
1c4baffc | 118 | sd_netlink_message *sd_netlink_message_ref(sd_netlink_message *m) { |
65f568bb TG |
119 | if (m) |
120 | assert_se(REFCNT_INC(m->n_ref) >= 2); | |
121 | ||
122 | return m; | |
123 | } | |
124 | ||
1c4baffc | 125 | sd_netlink_message *sd_netlink_message_unref(sd_netlink_message *m) { |
f0c4b1c3 | 126 | if (m && REFCNT_DEC(m->n_ref) == 0) { |
3dd215e0 TG |
127 | unsigned i; |
128 | ||
65f568bb | 129 | free(m->hdr); |
3dd215e0 | 130 | |
9f5bbfe3 | 131 | for (i = 0; i <= m->n_containers; i++) |
3dd215e0 TG |
132 | free(m->rta_offset_tb[i]); |
133 | ||
1c4baffc | 134 | sd_netlink_message_unref(m->next); |
1403f45a | 135 | |
65f568bb TG |
136 | free(m); |
137 | } | |
138 | ||
139 | return NULL; | |
140 | } | |
141 | ||
1c4baffc | 142 | int sd_netlink_message_get_type(sd_netlink_message *m, uint16_t *type) { |
65f568bb TG |
143 | assert_return(m, -EINVAL); |
144 | assert_return(type, -EINVAL); | |
145 | ||
146 | *type = m->hdr->nlmsg_type; | |
147 | ||
148 | return 0; | |
149 | } | |
150 | ||
1c4baffc | 151 | int sd_netlink_message_is_broadcast(sd_netlink_message *m) { |
1f0db3ed TG |
152 | assert_return(m, -EINVAL); |
153 | ||
3f42446d | 154 | return m->broadcast; |
1f0db3ed TG |
155 | } |
156 | ||
4ebe732c ZJS |
157 | /* If successful the updated message will be correctly aligned, if |
158 | unsuccessful the old message is untouched. */ | |
1c4baffc | 159 | static int add_rtattr(sd_netlink_message *m, unsigned short type, const void *data, size_t data_length) { |
7ca1d319 TG |
160 | uint32_t rta_length; |
161 | size_t message_length, padding_length; | |
65f568bb TG |
162 | struct nlmsghdr *new_hdr; |
163 | struct rtattr *rta; | |
8e337e64 | 164 | char *padding; |
5a081409 | 165 | unsigned i; |
7ca1d319 | 166 | int offset; |
65f568bb | 167 | |
33125ac5 TG |
168 | assert(m); |
169 | assert(m->hdr); | |
e5c4350b | 170 | assert(!m->sealed); |
33125ac5 | 171 | assert(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len); |
7ca1d319 TG |
172 | assert(!data || data_length); |
173 | ||
174 | /* get offset of the new attribute */ | |
175 | offset = m->hdr->nlmsg_len; | |
65f568bb | 176 | |
8e337e64 | 177 | /* get the size of the new rta attribute (with padding at the end) */ |
65f568bb | 178 | rta_length = RTA_LENGTH(data_length); |
4ebe732c ZJS |
179 | |
180 | /* get the new message size (with padding at the end) */ | |
7ca1d319 | 181 | message_length = offset + RTA_ALIGN(rta_length); |
65f568bb TG |
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 */ | |
7ca1d319 | 190 | rta = (struct rtattr *) ((uint8_t *) m->hdr + offset); |
65f568bb | 191 | |
5a081409 TG |
192 | /* if we are inside containers, extend them */ |
193 | for (i = 0; i < m->n_containers; i++) | |
7ca1d319 | 194 | GET_CONTAINER(m, i)->rta_len += message_length - offset; |
33125ac5 | 195 | |
65f568bb TG |
196 | /* fill in the attribute */ |
197 | rta->rta_type = type; | |
198 | rta->rta_len = rta_length; | |
7ca1d319 | 199 | if (data) |
33125ac5 TG |
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) | |
7ca1d319 | 202 | */ |
33125ac5 | 203 | padding = mempcpy(RTA_DATA(rta), data, data_length); |
7ca1d319 TG |
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); | |
33125ac5 | 208 | } |
65f568bb | 209 | |
7ca1d319 TG |
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 | ||
4ebe732c ZJS |
214 | /* update message size */ |
215 | m->hdr->nlmsg_len = message_length; | |
216 | ||
7ca1d319 | 217 | return offset; |
65f568bb TG |
218 | } |
219 | ||
6c14ad61 | 220 | static int message_attribute_has_type(sd_netlink_message *m, size_t *out_size, uint16_t attribute_type, uint16_t data_type) { |
d8e538ec TG |
221 | const NLType *type; |
222 | int r; | |
223 | ||
6c14ad61 DH |
224 | assert(m); |
225 | ||
d8e538ec TG |
226 | r = type_system_get_type(m->container_type_system[m->n_containers], &type, attribute_type); |
227 | if (r < 0) | |
228 | return r; | |
229 | ||
817d1cd8 | 230 | if (type_get_type(type) != data_type) |
d8e538ec TG |
231 | return -EINVAL; |
232 | ||
6c14ad61 DH |
233 | if (out_size) |
234 | *out_size = type_get_size(type); | |
235 | return 0; | |
d8e538ec TG |
236 | } |
237 | ||
1c4baffc | 238 | int sd_netlink_message_append_string(sd_netlink_message *m, unsigned short type, const char *data) { |
d8e538ec | 239 | size_t length, size; |
0a0dc69b | 240 | int r; |
65f568bb TG |
241 | |
242 | assert_return(m, -EINVAL); | |
e5c4350b | 243 | assert_return(!m->sealed, -EPERM); |
65f568bb TG |
244 | assert_return(data, -EINVAL); |
245 | ||
6c14ad61 | 246 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_STRING); |
0a0dc69b TG |
247 | if (r < 0) |
248 | return r; | |
65f568bb | 249 | |
d8e538ec | 250 | if (size) { |
3072eecf LP |
251 | length = strnlen(data, size+1); |
252 | if (length > size) | |
d8e538ec TG |
253 | return -EINVAL; |
254 | } else | |
255 | length = strlen(data); | |
33125ac5 | 256 | |
d8e538ec | 257 | r = add_rtattr(m, type, data, length + 1); |
0a0dc69b TG |
258 | if (r < 0) |
259 | return r; | |
260 | ||
261 | return 0; | |
262 | } | |
263 | ||
1c4baffc | 264 | int sd_netlink_message_append_u8(sd_netlink_message *m, unsigned short type, uint8_t data) { |
7b179640 SS |
265 | int r; |
266 | ||
267 | assert_return(m, -EINVAL); | |
268 | assert_return(!m->sealed, -EPERM); | |
269 | ||
6c14ad61 | 270 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U8); |
7b179640 SS |
271 | if (r < 0) |
272 | return r; | |
273 | ||
7b179640 SS |
274 | r = add_rtattr(m, type, &data, sizeof(uint8_t)); |
275 | if (r < 0) | |
276 | return r; | |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
281 | ||
1c4baffc | 282 | int sd_netlink_message_append_u16(sd_netlink_message *m, unsigned short type, uint16_t data) { |
01b36069 TG |
283 | int r; |
284 | ||
285 | assert_return(m, -EINVAL); | |
e5c4350b | 286 | assert_return(!m->sealed, -EPERM); |
01b36069 | 287 | |
6c14ad61 | 288 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U16); |
01b36069 TG |
289 | if (r < 0) |
290 | return r; | |
291 | ||
01b36069 TG |
292 | r = add_rtattr(m, type, &data, sizeof(uint16_t)); |
293 | if (r < 0) | |
294 | return r; | |
295 | ||
296 | return 0; | |
297 | } | |
298 | ||
1c4baffc | 299 | int sd_netlink_message_append_u32(sd_netlink_message *m, unsigned short type, uint32_t data) { |
0a0dc69b TG |
300 | int r; |
301 | ||
302 | assert_return(m, -EINVAL); | |
e5c4350b | 303 | assert_return(!m->sealed, -EPERM); |
0a0dc69b | 304 | |
6c14ad61 | 305 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U32); |
0a0dc69b TG |
306 | if (r < 0) |
307 | return r; | |
308 | ||
4d47756b | 309 | r = add_rtattr(m, type, &data, sizeof(uint32_t)); |
0a0dc69b TG |
310 | if (r < 0) |
311 | return r; | |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
1c4baffc | 316 | int sd_netlink_message_append_in_addr(sd_netlink_message *m, unsigned short type, const struct in_addr *data) { |
0a0dc69b TG |
317 | int r; |
318 | ||
319 | assert_return(m, -EINVAL); | |
e5c4350b | 320 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
321 | assert_return(data, -EINVAL); |
322 | ||
6c14ad61 | 323 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
0a0dc69b TG |
324 | if (r < 0) |
325 | return r; | |
326 | ||
4d47756b | 327 | r = add_rtattr(m, type, data, sizeof(struct in_addr)); |
0a0dc69b TG |
328 | if (r < 0) |
329 | return r; | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
1c4baffc | 334 | int sd_netlink_message_append_in6_addr(sd_netlink_message *m, unsigned short type, const struct in6_addr *data) { |
0a0dc69b TG |
335 | int r; |
336 | ||
337 | assert_return(m, -EINVAL); | |
e5c4350b | 338 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
339 | assert_return(data, -EINVAL); |
340 | ||
6c14ad61 | 341 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
0a0dc69b TG |
342 | if (r < 0) |
343 | return r; | |
344 | ||
4d47756b | 345 | r = add_rtattr(m, type, data, sizeof(struct in6_addr)); |
0a0dc69b TG |
346 | if (r < 0) |
347 | return r; | |
348 | ||
349 | return 0; | |
350 | } | |
351 | ||
1c4baffc | 352 | int sd_netlink_message_append_ether_addr(sd_netlink_message *m, unsigned short type, const struct ether_addr *data) { |
0a0dc69b TG |
353 | int r; |
354 | ||
355 | assert_return(m, -EINVAL); | |
e5c4350b | 356 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
357 | assert_return(data, -EINVAL); |
358 | ||
6c14ad61 | 359 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_ETHER_ADDR); |
d8e538ec TG |
360 | if (r < 0) |
361 | return r; | |
0a0dc69b | 362 | |
b9eaf3d1 | 363 | r = add_rtattr(m, type, data, ETH_ALEN); |
0a0dc69b TG |
364 | if (r < 0) |
365 | return r; | |
366 | ||
367 | return 0; | |
65f568bb TG |
368 | } |
369 | ||
1c4baffc | 370 | int sd_netlink_message_append_cache_info(sd_netlink_message *m, unsigned short type, const struct ifa_cacheinfo *info) { |
aba496a5 UTL |
371 | int r; |
372 | ||
373 | assert_return(m, -EINVAL); | |
374 | assert_return(!m->sealed, -EPERM); | |
375 | assert_return(info, -EINVAL); | |
376 | ||
6c14ad61 | 377 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_CACHE_INFO); |
aba496a5 UTL |
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 | ||
1c4baffc | 388 | int sd_netlink_message_open_container(sd_netlink_message *m, unsigned short type) { |
d8e538ec TG |
389 | size_t size; |
390 | int r; | |
33125ac5 | 391 | |
65f568bb | 392 | assert_return(m, -EINVAL); |
e5c4350b | 393 | assert_return(!m->sealed, -EPERM); |
7ca1d319 | 394 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -ERANGE); |
33125ac5 | 395 | |
6c14ad61 | 396 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_NESTED); |
4af7b60d TG |
397 | if (r < 0) { |
398 | const NLTypeSystemUnion *type_system_union; | |
399 | int family; | |
400 | ||
6c14ad61 | 401 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_UNION); |
4af7b60d TG |
402 | if (r < 0) |
403 | return r; | |
4af7b60d | 404 | |
89489ef7 | 405 | r = sd_rtnl_message_get_family(m, &family); |
4af7b60d TG |
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 { | |
4af7b60d TG |
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 | } | |
31a4e153 | 425 | |
fcf81a54 | 426 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, size); |
d8e538ec TG |
427 | if (r < 0) |
428 | return r; | |
429 | ||
7ca1d319 TG |
430 | m->container_offsets[m->n_containers ++] = r; |
431 | ||
d8e538ec TG |
432 | return 0; |
433 | } | |
434 | ||
1c4baffc | 435 | int sd_netlink_message_open_container_union(sd_netlink_message *m, unsigned short type, const char *key) { |
d8e538ec TG |
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; | |
33125ac5 | 451 | |
1c4baffc | 452 | r = sd_netlink_message_append_string(m, type_system_union->match, key); |
d8e538ec TG |
453 | if (r < 0) |
454 | return r; | |
455 | ||
456 | /* do we evere need non-null size */ | |
da041d69 | 457 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, 0); |
d8e538ec TG |
458 | if (r < 0) |
459 | return r; | |
460 | ||
7ca1d319 TG |
461 | m->container_offsets[m->n_containers ++] = r; |
462 | ||
d8e538ec | 463 | return 0; |
33125ac5 TG |
464 | } |
465 | ||
d8e538ec | 466 | |
1c4baffc | 467 | int sd_netlink_message_close_container(sd_netlink_message *m) { |
33125ac5 | 468 | assert_return(m, -EINVAL); |
e5c4350b | 469 | assert_return(!m->sealed, -EPERM); |
5a081409 | 470 | assert_return(m->n_containers > 0, -EINVAL); |
33125ac5 | 471 | |
d8e538ec | 472 | m->container_type_system[m->n_containers] = NULL; |
5a081409 | 473 | m->n_containers --; |
33125ac5 TG |
474 | |
475 | return 0; | |
476 | } | |
477 | ||
4203fc8b | 478 | static int netlink_message_read_internal(sd_netlink_message *m, unsigned short type, void **data) { |
f66eeb6b TG |
479 | struct rtattr *rta; |
480 | ||
44caa5e7 SS |
481 | assert_return(m, -EINVAL); |
482 | assert_return(m->sealed, -EPERM); | |
483 | assert_return(data, -EINVAL); | |
d8e538ec TG |
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]); | |
44caa5e7 | 487 | |
3dd215e0 | 488 | if(!m->rta_offset_tb[m->n_containers][type]) |
44caa5e7 SS |
489 | return -ENODATA; |
490 | ||
3dd215e0 | 491 | rta = (struct rtattr*)((uint8_t *) m->hdr + m->rta_offset_tb[m->n_containers][type]); |
44caa5e7 | 492 | |
f66eeb6b TG |
493 | *data = RTA_DATA(rta); |
494 | ||
495 | return RTA_PAYLOAD(rta); | |
44caa5e7 SS |
496 | } |
497 | ||
1c4baffc | 498 | int sd_netlink_message_read_string(sd_netlink_message *m, unsigned short type, const char **data) { |
44caa5e7 SS |
499 | int r; |
500 | void *attr_data; | |
501 | ||
73ae2b7d TG |
502 | assert_return(m, -EINVAL); |
503 | ||
6c14ad61 | 504 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_STRING); |
d8e538ec TG |
505 | if (r < 0) |
506 | return r; | |
44caa5e7 | 507 | |
4203fc8b | 508 | r = netlink_message_read_internal(m, type, &attr_data); |
f66eeb6b | 509 | if (r < 0) |
44caa5e7 | 510 | return r; |
f66eeb6b TG |
511 | else if (strnlen(attr_data, r) >= (size_t) r) |
512 | return -EIO; | |
44caa5e7 | 513 | |
73ae2b7d TG |
514 | if (data) |
515 | *data = (const char *) attr_data; | |
44caa5e7 SS |
516 | |
517 | return 0; | |
518 | } | |
519 | ||
1c4baffc | 520 | int sd_netlink_message_read_u8(sd_netlink_message *m, unsigned short type, uint8_t *data) { |
44caa5e7 SS |
521 | int r; |
522 | void *attr_data; | |
523 | ||
73ae2b7d TG |
524 | assert_return(m, -EINVAL); |
525 | ||
6c14ad61 | 526 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U8); |
d8e538ec TG |
527 | if (r < 0) |
528 | return r; | |
44caa5e7 | 529 | |
4203fc8b | 530 | r = netlink_message_read_internal(m, type, &attr_data); |
f66eeb6b | 531 | if (r < 0) |
44caa5e7 | 532 | return r; |
f66eeb6b TG |
533 | else if ((size_t) r < sizeof(uint8_t)) |
534 | return -EIO; | |
44caa5e7 | 535 | |
73ae2b7d TG |
536 | if (data) |
537 | *data = *(uint8_t *) attr_data; | |
44caa5e7 SS |
538 | |
539 | return 0; | |
540 | } | |
541 | ||
1c4baffc | 542 | int sd_netlink_message_read_u16(sd_netlink_message *m, unsigned short type, uint16_t *data) { |
44caa5e7 SS |
543 | int r; |
544 | void *attr_data; | |
545 | ||
73ae2b7d TG |
546 | assert_return(m, -EINVAL); |
547 | ||
6c14ad61 | 548 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U16); |
d8e538ec TG |
549 | if (r < 0) |
550 | return r; | |
44caa5e7 | 551 | |
4203fc8b | 552 | r = netlink_message_read_internal(m, type, &attr_data); |
f66eeb6b | 553 | if (r < 0) |
44caa5e7 | 554 | return r; |
f66eeb6b TG |
555 | else if ((size_t) r < sizeof(uint16_t)) |
556 | return -EIO; | |
44caa5e7 | 557 | |
73ae2b7d TG |
558 | if (data) |
559 | *data = *(uint16_t *) attr_data; | |
44caa5e7 SS |
560 | |
561 | return 0; | |
562 | } | |
563 | ||
1c4baffc | 564 | int sd_netlink_message_read_u32(sd_netlink_message *m, unsigned short type, uint32_t *data) { |
44caa5e7 SS |
565 | int r; |
566 | void *attr_data; | |
567 | ||
73ae2b7d TG |
568 | assert_return(m, -EINVAL); |
569 | ||
6c14ad61 | 570 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U32); |
d8e538ec TG |
571 | if (r < 0) |
572 | return r; | |
44caa5e7 | 573 | |
4203fc8b | 574 | r = netlink_message_read_internal(m, type, &attr_data); |
f66eeb6b | 575 | if (r < 0) |
44caa5e7 | 576 | return r; |
f66eeb6b TG |
577 | else if ((size_t)r < sizeof(uint32_t)) |
578 | return -EIO; | |
44caa5e7 | 579 | |
73ae2b7d TG |
580 | if (data) |
581 | *data = *(uint32_t *) attr_data; | |
44caa5e7 SS |
582 | |
583 | return 0; | |
584 | } | |
585 | ||
1c4baffc | 586 | int sd_netlink_message_read_ether_addr(sd_netlink_message *m, unsigned short type, struct ether_addr *data) { |
4e9e7f18 SS |
587 | int r; |
588 | void *attr_data; | |
589 | ||
73ae2b7d TG |
590 | assert_return(m, -EINVAL); |
591 | ||
6c14ad61 | 592 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_ETHER_ADDR); |
d8e538ec TG |
593 | if (r < 0) |
594 | return r; | |
4e9e7f18 | 595 | |
4203fc8b | 596 | r = netlink_message_read_internal(m, type, &attr_data); |
f66eeb6b | 597 | if (r < 0) |
4e9e7f18 | 598 | return r; |
f66eeb6b TG |
599 | else if ((size_t)r < sizeof(struct ether_addr)) |
600 | return -EIO; | |
4e9e7f18 | 601 | |
73ae2b7d TG |
602 | if (data) |
603 | memcpy(data, attr_data, sizeof(struct ether_addr)); | |
4e9e7f18 SS |
604 | |
605 | return 0; | |
606 | } | |
607 | ||
1c4baffc | 608 | int sd_netlink_message_read_cache_info(sd_netlink_message *m, unsigned short type, struct ifa_cacheinfo *info) { |
aba496a5 UTL |
609 | int r; |
610 | void *attr_data; | |
611 | ||
73ae2b7d TG |
612 | assert_return(m, -EINVAL); |
613 | ||
6c14ad61 | 614 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_CACHE_INFO); |
aba496a5 UTL |
615 | if (r < 0) |
616 | return r; | |
617 | ||
4203fc8b | 618 | r = netlink_message_read_internal(m, type, &attr_data); |
aba496a5 UTL |
619 | if (r < 0) |
620 | return r; | |
621 | else if ((size_t)r < sizeof(struct ifa_cacheinfo)) | |
622 | return -EIO; | |
623 | ||
73ae2b7d TG |
624 | if (info) |
625 | memcpy(info, attr_data, sizeof(struct ifa_cacheinfo)); | |
aba496a5 UTL |
626 | |
627 | return 0; | |
628 | } | |
629 | ||
1c4baffc | 630 | int sd_netlink_message_read_in_addr(sd_netlink_message *m, unsigned short type, struct in_addr *data) { |
4e9e7f18 SS |
631 | int r; |
632 | void *attr_data; | |
633 | ||
73ae2b7d TG |
634 | assert_return(m, -EINVAL); |
635 | ||
6c14ad61 | 636 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
d8e538ec TG |
637 | if (r < 0) |
638 | return r; | |
4e9e7f18 | 639 | |
4203fc8b | 640 | r = netlink_message_read_internal(m, type, &attr_data); |
f66eeb6b | 641 | if (r < 0) |
4e9e7f18 | 642 | return r; |
f66eeb6b TG |
643 | else if ((size_t)r < sizeof(struct in_addr)) |
644 | return -EIO; | |
4e9e7f18 | 645 | |
73ae2b7d TG |
646 | if (data) |
647 | memcpy(data, attr_data, sizeof(struct in_addr)); | |
4e9e7f18 SS |
648 | |
649 | return 0; | |
650 | } | |
651 | ||
1c4baffc | 652 | int sd_netlink_message_read_in6_addr(sd_netlink_message *m, unsigned short type, struct in6_addr *data) { |
4e9e7f18 SS |
653 | int r; |
654 | void *attr_data; | |
655 | ||
73ae2b7d TG |
656 | assert_return(m, -EINVAL); |
657 | ||
6c14ad61 | 658 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
d8e538ec TG |
659 | if (r < 0) |
660 | return r; | |
4e9e7f18 | 661 | |
4203fc8b | 662 | r = netlink_message_read_internal(m, type, &attr_data); |
3dd215e0 | 663 | if (r < 0) |
4e9e7f18 | 664 | return r; |
3dd215e0 TG |
665 | else if ((size_t)r < sizeof(struct in6_addr)) |
666 | return -EIO; | |
4e9e7f18 | 667 | |
73ae2b7d TG |
668 | if (data) |
669 | memcpy(data, attr_data, sizeof(struct in6_addr)); | |
4e9e7f18 SS |
670 | |
671 | return 0; | |
672 | } | |
673 | ||
4203fc8b TG |
674 | static int netlink_message_parse(sd_netlink_message *m, |
675 | size_t **rta_offset_tb, | |
676 | unsigned short *rta_tb_size, | |
677 | int count, | |
678 | struct rtattr *rta, | |
679 | unsigned int rt_len) { | |
680 | unsigned short type; | |
681 | size_t *tb; | |
682 | ||
683 | tb = new0(size_t, count); | |
684 | if(!tb) | |
685 | return -ENOMEM; | |
686 | ||
687 | *rta_tb_size = count; | |
688 | ||
689 | for (; RTA_OK(rta, rt_len); rta = RTA_NEXT(rta, rt_len)) { | |
690 | type = RTA_TYPE(rta); | |
691 | ||
692 | /* if the kernel is newer than the headers we used | |
693 | when building, we ignore out-of-range attributes | |
694 | */ | |
695 | if (type >= count) | |
696 | continue; | |
697 | ||
698 | if (tb[type]) | |
699 | log_debug("rtnl: message parse - overwriting repeated attribute"); | |
700 | ||
701 | tb[type] = (uint8_t *) rta - (uint8_t *) m->hdr; | |
702 | } | |
703 | ||
704 | *rta_offset_tb = tb; | |
705 | ||
706 | return 0; | |
707 | } | |
708 | ||
817d1cd8 | 709 | int sd_netlink_message_enter_container(sd_netlink_message *m, unsigned short type_id) { |
d8e538ec TG |
710 | const NLType *nl_type; |
711 | const NLTypeSystem *type_system; | |
3dd215e0 | 712 | void *container; |
817d1cd8 | 713 | uint16_t type; |
d8e538ec TG |
714 | size_t size; |
715 | int r; | |
3dd215e0 TG |
716 | |
717 | assert_return(m, -EINVAL); | |
718 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -EINVAL); | |
719 | ||
d8e538ec TG |
720 | r = type_system_get_type(m->container_type_system[m->n_containers], |
721 | &nl_type, | |
817d1cd8 | 722 | type_id); |
3dd215e0 TG |
723 | if (r < 0) |
724 | return r; | |
3dd215e0 | 725 | |
817d1cd8 DH |
726 | type = type_get_type(nl_type); |
727 | ||
728 | if (type == NETLINK_TYPE_NESTED) { | |
d8e538ec TG |
729 | r = type_system_get_type_system(m->container_type_system[m->n_containers], |
730 | &type_system, | |
817d1cd8 | 731 | type_id); |
d8e538ec TG |
732 | if (r < 0) |
733 | return r; | |
817d1cd8 | 734 | } else if (type == NETLINK_TYPE_UNION) { |
d8e538ec | 735 | const NLTypeSystemUnion *type_system_union; |
d8e538ec TG |
736 | |
737 | r = type_system_get_type_system_union(m->container_type_system[m->n_containers], | |
738 | &type_system_union, | |
817d1cd8 | 739 | type_id); |
d8e538ec TG |
740 | if (r < 0) |
741 | return r; | |
742 | ||
4af7b60d TG |
743 | switch (type_system_union->match_type) { |
744 | case NL_MATCH_SIBLING: | |
745 | { | |
746 | const char *key; | |
747 | ||
1c4baffc | 748 | r = sd_netlink_message_read_string(m, type_system_union->match, &key); |
4af7b60d TG |
749 | if (r < 0) |
750 | return r; | |
751 | ||
752 | r = type_system_union_get_type_system(type_system_union, | |
753 | &type_system, | |
754 | key); | |
755 | if (r < 0) | |
756 | return r; | |
757 | ||
758 | break; | |
759 | } | |
760 | case NL_MATCH_PROTOCOL: | |
761 | { | |
762 | int family; | |
763 | ||
89489ef7 | 764 | r = sd_rtnl_message_get_family(m, &family); |
4af7b60d TG |
765 | if (r < 0) |
766 | return r; | |
767 | ||
768 | r = type_system_union_protocol_get_type_system(type_system_union, | |
769 | &type_system, | |
770 | family); | |
771 | if (r < 0) | |
772 | return r; | |
773 | ||
774 | break; | |
775 | } | |
776 | default: | |
1c4baffc | 777 | assert_not_reached("sd-netlink: invalid type system union type"); |
4af7b60d | 778 | } |
d8e538ec TG |
779 | } else |
780 | return -EINVAL; | |
781 | ||
4203fc8b | 782 | r = netlink_message_read_internal(m, type_id, &container); |
3dd215e0 TG |
783 | if (r < 0) |
784 | return r; | |
d8e538ec TG |
785 | else |
786 | size = (size_t)r; | |
3dd215e0 | 787 | |
d8e538ec | 788 | m->n_containers ++; |
3dd215e0 | 789 | |
4203fc8b TG |
790 | r = netlink_message_parse(m, |
791 | &m->rta_offset_tb[m->n_containers], | |
792 | &m->rta_tb_size[m->n_containers], | |
793 | type_system_get_count(type_system), | |
794 | container, | |
795 | size); | |
d8e538ec TG |
796 | if (r < 0) { |
797 | m->n_containers --; | |
3dd215e0 | 798 | return r; |
d8e538ec | 799 | } |
3dd215e0 | 800 | |
d8e538ec | 801 | m->container_type_system[m->n_containers] = type_system; |
3dd215e0 TG |
802 | |
803 | return 0; | |
804 | } | |
805 | ||
1c4baffc | 806 | int sd_netlink_message_exit_container(sd_netlink_message *m) { |
e5c4350b TG |
807 | assert_return(m, -EINVAL); |
808 | assert_return(m->sealed, -EINVAL); | |
809 | assert_return(m->n_containers > 0, -EINVAL); | |
810 | ||
3dd215e0 TG |
811 | free(m->rta_offset_tb[m->n_containers]); |
812 | m->rta_offset_tb[m->n_containers] = NULL; | |
d8e538ec | 813 | m->container_type_system[m->n_containers] = NULL; |
3dd215e0 | 814 | |
e5c4350b TG |
815 | m->n_containers --; |
816 | ||
817 | return 0; | |
818 | } | |
819 | ||
1c4baffc | 820 | uint32_t rtnl_message_get_serial(sd_netlink_message *m) { |
65f568bb | 821 | assert(m); |
9d0db178 | 822 | assert(m->hdr); |
65f568bb TG |
823 | |
824 | return m->hdr->nlmsg_seq; | |
825 | } | |
826 | ||
1c4baffc | 827 | int sd_netlink_message_is_error(sd_netlink_message *m) { |
45af44d4 TG |
828 | assert_return(m, 0); |
829 | assert_return(m->hdr, 0); | |
830 | ||
831 | return m->hdr->nlmsg_type == NLMSG_ERROR; | |
832 | } | |
833 | ||
1c4baffc | 834 | int sd_netlink_message_get_errno(sd_netlink_message *m) { |
65f568bb TG |
835 | struct nlmsgerr *err; |
836 | ||
e16bcf98 | 837 | assert_return(m, -EINVAL); |
9d0db178 | 838 | assert_return(m->hdr, -EINVAL); |
65f568bb | 839 | |
1c4baffc | 840 | if (!sd_netlink_message_is_error(m)) |
65f568bb TG |
841 | return 0; |
842 | ||
843 | err = NLMSG_DATA(m->hdr); | |
844 | ||
845 | return err->error; | |
846 | } | |
847 | ||
1c4baffc | 848 | int sd_netlink_message_rewind(sd_netlink_message *m) { |
817d1cd8 DH |
849 | const NLType *nl_type; |
850 | uint16_t type; | |
851 | size_t size; | |
3dd215e0 TG |
852 | unsigned i; |
853 | int r; | |
0fc7531b TG |
854 | |
855 | assert_return(m, -EINVAL); | |
0fc7531b | 856 | |
3dd215e0 TG |
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; | |
d8e538ec | 865 | m->container_type_system[i] = NULL; |
3dd215e0 TG |
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 | ||
d8e538ec TG |
875 | assert(m->hdr); |
876 | ||
846a6b3d | 877 | r = type_system_get_type(&type_system_root, &nl_type, m->hdr->nlmsg_type); |
d8e538ec TG |
878 | if (r < 0) |
879 | return r; | |
880 | ||
817d1cd8 DH |
881 | type = type_get_type(nl_type); |
882 | size = type_get_size(nl_type); | |
883 | ||
884 | if (type == NETLINK_TYPE_NESTED) { | |
c658008f | 885 | const NLTypeSystem *type_system; |
d8e538ec | 886 | |
817d1cd8 | 887 | type_get_type_system(nl_type, &type_system); |
d8e538ec TG |
888 | |
889 | m->container_type_system[0] = type_system; | |
890 | ||
4203fc8b TG |
891 | r = netlink_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)); | |
d8e538ec TG |
897 | if (r < 0) |
898 | return r; | |
0fc7531b TG |
899 | } |
900 | ||
901 | return 0; | |
902 | } | |
3dd215e0 | 903 | |
1c4baffc | 904 | void rtnl_message_seal(sd_netlink_message *m) { |
3dd215e0 TG |
905 | assert(m); |
906 | assert(!m->sealed); | |
907 | ||
908 | m->sealed = true; | |
909 | } | |
1403f45a | 910 | |
1c4baffc | 911 | sd_netlink_message *sd_netlink_message_next(sd_netlink_message *m) { |
1403f45a TG |
912 | assert_return(m, NULL); |
913 | ||
914 | return m->next; | |
915 | } |