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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 | |
f663aeb8 | 37 | #define GET_CONTAINER(m, i) ((i) < (m)->n_containers ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->containers[i].offset) : 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 | ||
f663aeb8 | 91 | type_get_type_system(nl_type, &m->containers[0].type_system); |
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++) |
f663aeb8 | 132 | free(m->containers[i].attributes); |
3dd215e0 | 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 | ||
f663aeb8 | 226 | r = type_system_get_type(m->containers[m->n_containers].type_system, &type, attribute_type); |
d8e538ec TG |
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 | ||
f663aeb8 | 409 | r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, &type_system_union, type); |
4af7b60d TG |
410 | if (r < 0) |
411 | return r; | |
412 | ||
413 | r = type_system_union_protocol_get_type_system(type_system_union, | |
f663aeb8 | 414 | &m->containers[m->n_containers + 1].type_system, |
4af7b60d TG |
415 | family); |
416 | if (r < 0) | |
417 | return r; | |
418 | } else { | |
f663aeb8 TG |
419 | r = type_system_get_type_system(m->containers[m->n_containers].type_system, |
420 | &m->containers[m->n_containers + 1].type_system, | |
4af7b60d TG |
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 | ||
f663aeb8 | 430 | m->containers[m->n_containers ++].offset = r; |
7ca1d319 | 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 | ||
f663aeb8 | 442 | r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, &type_system_union, type); |
d8e538ec TG |
443 | if (r < 0) |
444 | return r; | |
445 | ||
446 | r = type_system_union_get_type_system(type_system_union, | |
f663aeb8 | 447 | &m->containers[m->n_containers + 1].type_system, |
d8e538ec TG |
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 | ||
f663aeb8 | 461 | m->containers[m->n_containers ++].offset = r; |
7ca1d319 | 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 | |
f663aeb8 | 472 | m->containers[m->n_containers].type_system = 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) { |
f663aeb8 | 479 | struct netlink_attribute *attribute; |
f66eeb6b TG |
480 | struct rtattr *rta; |
481 | ||
44caa5e7 SS |
482 | assert_return(m, -EINVAL); |
483 | assert_return(m->sealed, -EPERM); | |
484 | assert_return(data, -EINVAL); | |
d8e538ec | 485 | assert(m->n_containers <= RTNL_CONTAINER_DEPTH); |
f663aeb8 TG |
486 | assert(m->containers[m->n_containers].attributes); |
487 | assert(type < m->containers[m->n_containers].n_attributes); | |
44caa5e7 | 488 | |
f663aeb8 TG |
489 | attribute = &m->containers[m->n_containers].attributes[type]; |
490 | ||
491 | if(!attribute->offset) | |
44caa5e7 SS |
492 | return -ENODATA; |
493 | ||
f663aeb8 | 494 | rta = (struct rtattr*)((uint8_t *) m->hdr + attribute->offset); |
44caa5e7 | 495 | |
f66eeb6b TG |
496 | *data = RTA_DATA(rta); |
497 | ||
498 | return RTA_PAYLOAD(rta); | |
44caa5e7 SS |
499 | } |
500 | ||
1c4baffc | 501 | int sd_netlink_message_read_string(sd_netlink_message *m, unsigned short type, const char **data) { |
44caa5e7 SS |
502 | int r; |
503 | void *attr_data; | |
504 | ||
73ae2b7d TG |
505 | assert_return(m, -EINVAL); |
506 | ||
6c14ad61 | 507 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_STRING); |
d8e538ec TG |
508 | if (r < 0) |
509 | return r; | |
44caa5e7 | 510 | |
4203fc8b | 511 | r = netlink_message_read_internal(m, type, &attr_data); |
f66eeb6b | 512 | if (r < 0) |
44caa5e7 | 513 | return r; |
f66eeb6b TG |
514 | else if (strnlen(attr_data, r) >= (size_t) r) |
515 | return -EIO; | |
44caa5e7 | 516 | |
73ae2b7d TG |
517 | if (data) |
518 | *data = (const char *) attr_data; | |
44caa5e7 SS |
519 | |
520 | return 0; | |
521 | } | |
522 | ||
1c4baffc | 523 | int sd_netlink_message_read_u8(sd_netlink_message *m, unsigned short type, uint8_t *data) { |
44caa5e7 SS |
524 | int r; |
525 | void *attr_data; | |
526 | ||
73ae2b7d TG |
527 | assert_return(m, -EINVAL); |
528 | ||
6c14ad61 | 529 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U8); |
d8e538ec TG |
530 | if (r < 0) |
531 | return r; | |
44caa5e7 | 532 | |
4203fc8b | 533 | r = netlink_message_read_internal(m, type, &attr_data); |
f66eeb6b | 534 | if (r < 0) |
44caa5e7 | 535 | return r; |
f66eeb6b TG |
536 | else if ((size_t) r < sizeof(uint8_t)) |
537 | return -EIO; | |
44caa5e7 | 538 | |
73ae2b7d TG |
539 | if (data) |
540 | *data = *(uint8_t *) attr_data; | |
44caa5e7 SS |
541 | |
542 | return 0; | |
543 | } | |
544 | ||
1c4baffc | 545 | int sd_netlink_message_read_u16(sd_netlink_message *m, unsigned short type, uint16_t *data) { |
44caa5e7 SS |
546 | int r; |
547 | void *attr_data; | |
548 | ||
73ae2b7d TG |
549 | assert_return(m, -EINVAL); |
550 | ||
6c14ad61 | 551 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U16); |
d8e538ec TG |
552 | if (r < 0) |
553 | return r; | |
44caa5e7 | 554 | |
4203fc8b | 555 | r = netlink_message_read_internal(m, type, &attr_data); |
f66eeb6b | 556 | if (r < 0) |
44caa5e7 | 557 | return r; |
f66eeb6b TG |
558 | else if ((size_t) r < sizeof(uint16_t)) |
559 | return -EIO; | |
44caa5e7 | 560 | |
73ae2b7d TG |
561 | if (data) |
562 | *data = *(uint16_t *) attr_data; | |
44caa5e7 SS |
563 | |
564 | return 0; | |
565 | } | |
566 | ||
1c4baffc | 567 | int sd_netlink_message_read_u32(sd_netlink_message *m, unsigned short type, uint32_t *data) { |
44caa5e7 SS |
568 | int r; |
569 | void *attr_data; | |
570 | ||
73ae2b7d TG |
571 | assert_return(m, -EINVAL); |
572 | ||
6c14ad61 | 573 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U32); |
d8e538ec TG |
574 | if (r < 0) |
575 | return r; | |
44caa5e7 | 576 | |
4203fc8b | 577 | r = netlink_message_read_internal(m, type, &attr_data); |
f66eeb6b | 578 | if (r < 0) |
44caa5e7 | 579 | return r; |
f66eeb6b TG |
580 | else if ((size_t)r < sizeof(uint32_t)) |
581 | return -EIO; | |
44caa5e7 | 582 | |
73ae2b7d TG |
583 | if (data) |
584 | *data = *(uint32_t *) attr_data; | |
44caa5e7 SS |
585 | |
586 | return 0; | |
587 | } | |
588 | ||
1c4baffc | 589 | int sd_netlink_message_read_ether_addr(sd_netlink_message *m, unsigned short type, struct ether_addr *data) { |
4e9e7f18 SS |
590 | int r; |
591 | void *attr_data; | |
592 | ||
73ae2b7d TG |
593 | assert_return(m, -EINVAL); |
594 | ||
6c14ad61 | 595 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_ETHER_ADDR); |
d8e538ec TG |
596 | if (r < 0) |
597 | return r; | |
4e9e7f18 | 598 | |
4203fc8b | 599 | r = netlink_message_read_internal(m, type, &attr_data); |
f66eeb6b | 600 | if (r < 0) |
4e9e7f18 | 601 | return r; |
f66eeb6b TG |
602 | else if ((size_t)r < sizeof(struct ether_addr)) |
603 | return -EIO; | |
4e9e7f18 | 604 | |
73ae2b7d TG |
605 | if (data) |
606 | memcpy(data, attr_data, sizeof(struct ether_addr)); | |
4e9e7f18 SS |
607 | |
608 | return 0; | |
609 | } | |
610 | ||
1c4baffc | 611 | int sd_netlink_message_read_cache_info(sd_netlink_message *m, unsigned short type, struct ifa_cacheinfo *info) { |
aba496a5 UTL |
612 | int r; |
613 | void *attr_data; | |
614 | ||
73ae2b7d TG |
615 | assert_return(m, -EINVAL); |
616 | ||
6c14ad61 | 617 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_CACHE_INFO); |
aba496a5 UTL |
618 | if (r < 0) |
619 | return r; | |
620 | ||
4203fc8b | 621 | r = netlink_message_read_internal(m, type, &attr_data); |
aba496a5 UTL |
622 | if (r < 0) |
623 | return r; | |
624 | else if ((size_t)r < sizeof(struct ifa_cacheinfo)) | |
625 | return -EIO; | |
626 | ||
73ae2b7d TG |
627 | if (info) |
628 | memcpy(info, attr_data, sizeof(struct ifa_cacheinfo)); | |
aba496a5 UTL |
629 | |
630 | return 0; | |
631 | } | |
632 | ||
1c4baffc | 633 | int sd_netlink_message_read_in_addr(sd_netlink_message *m, unsigned short type, struct in_addr *data) { |
4e9e7f18 SS |
634 | int r; |
635 | void *attr_data; | |
636 | ||
73ae2b7d TG |
637 | assert_return(m, -EINVAL); |
638 | ||
6c14ad61 | 639 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
d8e538ec TG |
640 | if (r < 0) |
641 | return r; | |
4e9e7f18 | 642 | |
4203fc8b | 643 | r = netlink_message_read_internal(m, type, &attr_data); |
f66eeb6b | 644 | if (r < 0) |
4e9e7f18 | 645 | return r; |
f66eeb6b TG |
646 | else if ((size_t)r < sizeof(struct in_addr)) |
647 | return -EIO; | |
4e9e7f18 | 648 | |
73ae2b7d TG |
649 | if (data) |
650 | memcpy(data, attr_data, sizeof(struct in_addr)); | |
4e9e7f18 SS |
651 | |
652 | return 0; | |
653 | } | |
654 | ||
1c4baffc | 655 | int sd_netlink_message_read_in6_addr(sd_netlink_message *m, unsigned short type, struct in6_addr *data) { |
4e9e7f18 SS |
656 | int r; |
657 | void *attr_data; | |
658 | ||
73ae2b7d TG |
659 | assert_return(m, -EINVAL); |
660 | ||
6c14ad61 | 661 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
d8e538ec TG |
662 | if (r < 0) |
663 | return r; | |
4e9e7f18 | 664 | |
4203fc8b | 665 | r = netlink_message_read_internal(m, type, &attr_data); |
3dd215e0 | 666 | if (r < 0) |
4e9e7f18 | 667 | return r; |
3dd215e0 TG |
668 | else if ((size_t)r < sizeof(struct in6_addr)) |
669 | return -EIO; | |
4e9e7f18 | 670 | |
73ae2b7d TG |
671 | if (data) |
672 | memcpy(data, attr_data, sizeof(struct in6_addr)); | |
4e9e7f18 SS |
673 | |
674 | return 0; | |
675 | } | |
676 | ||
f663aeb8 TG |
677 | static int netlink_container_parse(sd_netlink_message *m, |
678 | struct netlink_container *container, | |
679 | int count, | |
680 | struct rtattr *rta, | |
681 | unsigned int rt_len) { | |
682 | _cleanup_free_ struct netlink_attribute *attributes = NULL; | |
4203fc8b | 683 | |
f663aeb8 TG |
684 | attributes = new0(struct netlink_attribute, count); |
685 | if(!attributes) | |
4203fc8b TG |
686 | return -ENOMEM; |
687 | ||
4203fc8b | 688 | for (; RTA_OK(rta, rt_len); rta = RTA_NEXT(rta, rt_len)) { |
f663aeb8 TG |
689 | unsigned short type; |
690 | ||
4203fc8b TG |
691 | type = RTA_TYPE(rta); |
692 | ||
693 | /* if the kernel is newer than the headers we used | |
f663aeb8 | 694 | when building, we ignore out-of-range attributes */ |
4203fc8b TG |
695 | if (type >= count) |
696 | continue; | |
697 | ||
f663aeb8 | 698 | if (attributes[type].offset) |
4203fc8b TG |
699 | log_debug("rtnl: message parse - overwriting repeated attribute"); |
700 | ||
f663aeb8 | 701 | attributes[type].offset = (uint8_t *) rta - (uint8_t *) m->hdr; |
4203fc8b TG |
702 | } |
703 | ||
f663aeb8 TG |
704 | container->attributes = attributes; |
705 | attributes = NULL; | |
706 | container->n_attributes = count; | |
4203fc8b TG |
707 | |
708 | return 0; | |
709 | } | |
710 | ||
817d1cd8 | 711 | int sd_netlink_message_enter_container(sd_netlink_message *m, unsigned short type_id) { |
d8e538ec TG |
712 | const NLType *nl_type; |
713 | const NLTypeSystem *type_system; | |
3dd215e0 | 714 | void *container; |
817d1cd8 | 715 | uint16_t type; |
d8e538ec TG |
716 | size_t size; |
717 | int r; | |
3dd215e0 TG |
718 | |
719 | assert_return(m, -EINVAL); | |
720 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -EINVAL); | |
721 | ||
f663aeb8 | 722 | r = type_system_get_type(m->containers[m->n_containers].type_system, |
d8e538ec | 723 | &nl_type, |
817d1cd8 | 724 | type_id); |
3dd215e0 TG |
725 | if (r < 0) |
726 | return r; | |
3dd215e0 | 727 | |
817d1cd8 DH |
728 | type = type_get_type(nl_type); |
729 | ||
730 | if (type == NETLINK_TYPE_NESTED) { | |
f663aeb8 | 731 | r = type_system_get_type_system(m->containers[m->n_containers].type_system, |
d8e538ec | 732 | &type_system, |
817d1cd8 | 733 | type_id); |
d8e538ec TG |
734 | if (r < 0) |
735 | return r; | |
817d1cd8 | 736 | } else if (type == NETLINK_TYPE_UNION) { |
d8e538ec | 737 | const NLTypeSystemUnion *type_system_union; |
d8e538ec | 738 | |
f663aeb8 | 739 | r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, |
d8e538ec | 740 | &type_system_union, |
817d1cd8 | 741 | type_id); |
d8e538ec TG |
742 | if (r < 0) |
743 | return r; | |
744 | ||
4af7b60d TG |
745 | switch (type_system_union->match_type) { |
746 | case NL_MATCH_SIBLING: | |
747 | { | |
748 | const char *key; | |
749 | ||
1c4baffc | 750 | r = sd_netlink_message_read_string(m, type_system_union->match, &key); |
4af7b60d TG |
751 | if (r < 0) |
752 | return r; | |
753 | ||
754 | r = type_system_union_get_type_system(type_system_union, | |
755 | &type_system, | |
756 | key); | |
757 | if (r < 0) | |
758 | return r; | |
759 | ||
760 | break; | |
761 | } | |
762 | case NL_MATCH_PROTOCOL: | |
763 | { | |
764 | int family; | |
765 | ||
89489ef7 | 766 | r = sd_rtnl_message_get_family(m, &family); |
4af7b60d TG |
767 | if (r < 0) |
768 | return r; | |
769 | ||
770 | r = type_system_union_protocol_get_type_system(type_system_union, | |
771 | &type_system, | |
772 | family); | |
773 | if (r < 0) | |
774 | return r; | |
775 | ||
776 | break; | |
777 | } | |
778 | default: | |
1c4baffc | 779 | assert_not_reached("sd-netlink: invalid type system union type"); |
4af7b60d | 780 | } |
d8e538ec TG |
781 | } else |
782 | return -EINVAL; | |
783 | ||
4203fc8b | 784 | r = netlink_message_read_internal(m, type_id, &container); |
3dd215e0 TG |
785 | if (r < 0) |
786 | return r; | |
d8e538ec TG |
787 | else |
788 | size = (size_t)r; | |
3dd215e0 | 789 | |
d8e538ec | 790 | m->n_containers ++; |
3dd215e0 | 791 | |
f663aeb8 TG |
792 | r = netlink_container_parse(m, |
793 | &m->containers[m->n_containers], | |
794 | type_system_get_count(type_system), | |
795 | container, | |
796 | size); | |
d8e538ec TG |
797 | if (r < 0) { |
798 | m->n_containers --; | |
3dd215e0 | 799 | return r; |
d8e538ec | 800 | } |
3dd215e0 | 801 | |
f663aeb8 | 802 | m->containers[m->n_containers].type_system = type_system; |
3dd215e0 TG |
803 | |
804 | return 0; | |
805 | } | |
806 | ||
1c4baffc | 807 | int sd_netlink_message_exit_container(sd_netlink_message *m) { |
e5c4350b TG |
808 | assert_return(m, -EINVAL); |
809 | assert_return(m->sealed, -EINVAL); | |
810 | assert_return(m->n_containers > 0, -EINVAL); | |
811 | ||
f663aeb8 TG |
812 | free(m->containers[m->n_containers].attributes); |
813 | m->containers[m->n_containers].attributes = NULL; | |
814 | m->containers[m->n_containers].type_system = NULL; | |
3dd215e0 | 815 | |
e5c4350b TG |
816 | m->n_containers --; |
817 | ||
818 | return 0; | |
819 | } | |
820 | ||
1c4baffc | 821 | uint32_t rtnl_message_get_serial(sd_netlink_message *m) { |
65f568bb | 822 | assert(m); |
9d0db178 | 823 | assert(m->hdr); |
65f568bb TG |
824 | |
825 | return m->hdr->nlmsg_seq; | |
826 | } | |
827 | ||
1c4baffc | 828 | int sd_netlink_message_is_error(sd_netlink_message *m) { |
45af44d4 TG |
829 | assert_return(m, 0); |
830 | assert_return(m->hdr, 0); | |
831 | ||
832 | return m->hdr->nlmsg_type == NLMSG_ERROR; | |
833 | } | |
834 | ||
1c4baffc | 835 | int sd_netlink_message_get_errno(sd_netlink_message *m) { |
65f568bb TG |
836 | struct nlmsgerr *err; |
837 | ||
e16bcf98 | 838 | assert_return(m, -EINVAL); |
9d0db178 | 839 | assert_return(m->hdr, -EINVAL); |
65f568bb | 840 | |
1c4baffc | 841 | if (!sd_netlink_message_is_error(m)) |
65f568bb TG |
842 | return 0; |
843 | ||
844 | err = NLMSG_DATA(m->hdr); | |
845 | ||
846 | return err->error; | |
847 | } | |
848 | ||
1c4baffc | 849 | int sd_netlink_message_rewind(sd_netlink_message *m) { |
817d1cd8 DH |
850 | const NLType *nl_type; |
851 | uint16_t type; | |
852 | size_t size; | |
3dd215e0 TG |
853 | unsigned i; |
854 | int r; | |
0fc7531b TG |
855 | |
856 | assert_return(m, -EINVAL); | |
0fc7531b | 857 | |
3dd215e0 TG |
858 | /* don't allow appending to message once parsed */ |
859 | if (!m->sealed) | |
860 | rtnl_message_seal(m); | |
861 | ||
862 | for (i = 1; i <= m->n_containers; i++) { | |
f663aeb8 TG |
863 | free(m->containers[i].attributes); |
864 | m->containers[i].attributes = NULL; | |
3dd215e0 TG |
865 | } |
866 | ||
867 | m->n_containers = 0; | |
868 | ||
f663aeb8 | 869 | if (m->containers[0].attributes) { |
3dd215e0 TG |
870 | /* top-level attributes have already been parsed */ |
871 | return 0; | |
872 | } | |
873 | ||
d8e538ec TG |
874 | assert(m->hdr); |
875 | ||
846a6b3d | 876 | r = type_system_get_type(&type_system_root, &nl_type, m->hdr->nlmsg_type); |
d8e538ec TG |
877 | if (r < 0) |
878 | return r; | |
879 | ||
817d1cd8 DH |
880 | type = type_get_type(nl_type); |
881 | size = type_get_size(nl_type); | |
882 | ||
883 | if (type == NETLINK_TYPE_NESTED) { | |
c658008f | 884 | const NLTypeSystem *type_system; |
d8e538ec | 885 | |
817d1cd8 | 886 | type_get_type_system(nl_type, &type_system); |
d8e538ec | 887 | |
f663aeb8 | 888 | m->containers[0].type_system = type_system; |
d8e538ec | 889 | |
f663aeb8 TG |
890 | r = netlink_container_parse(m, |
891 | &m->containers[m->n_containers], | |
892 | type_system_get_count(type_system), | |
893 | (struct rtattr*)((uint8_t*)NLMSG_DATA(m->hdr) + NLMSG_ALIGN(size)), | |
894 | NLMSG_PAYLOAD(m->hdr, size)); | |
d8e538ec TG |
895 | if (r < 0) |
896 | return r; | |
0fc7531b TG |
897 | } |
898 | ||
899 | return 0; | |
900 | } | |
3dd215e0 | 901 | |
1c4baffc | 902 | void rtnl_message_seal(sd_netlink_message *m) { |
3dd215e0 TG |
903 | assert(m); |
904 | assert(!m->sealed); | |
905 | ||
906 | m->sealed = true; | |
907 | } | |
1403f45a | 908 | |
1c4baffc | 909 | sd_netlink_message *sd_netlink_message_next(sd_netlink_message *m) { |
1403f45a TG |
910 | assert_return(m, NULL); |
911 | ||
912 | return m->next; | |
913 | } |