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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 | 40 | #define RTA_TYPE(rta) ((rta)->rta_type & NLA_TYPE_MASK) |
4c641e99 | 41 | #define RTA_FLAGS(rta) ((rta)->rta_type & ~NLA_TYPE_MASK) |
0a2478a9 | 42 | |
89489ef7 | 43 | int message_new_empty(sd_netlink *rtnl, sd_netlink_message **ret) { |
1c4baffc | 44 | sd_netlink_message *m; |
65f568bb TG |
45 | |
46 | assert_return(ret, -EINVAL); | |
65f568bb | 47 | |
f131770b | 48 | /* Note that 'rtnl' is currently unused, if we start using it internally |
8c578303 | 49 | we must take care to avoid problems due to mutual references between |
ff9b60f3 | 50 | buses and their queued messages. See sd-bus. |
8c578303 TG |
51 | */ |
52 | ||
1c4baffc | 53 | m = new0(sd_netlink_message, 1); |
65f568bb TG |
54 | if (!m) |
55 | return -ENOMEM; | |
56 | ||
65f568bb TG |
57 | m->n_ref = REFCNT_INIT; |
58 | ||
65f568bb TG |
59 | m->sealed = false; |
60 | ||
61 | *ret = m; | |
62 | ||
63 | return 0; | |
64 | } | |
65 | ||
1c4baffc TG |
66 | int message_new(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t type) { |
67 | _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL; | |
d8e538ec TG |
68 | const NLType *nl_type; |
69 | size_t size; | |
70 | int r; | |
71 | ||
846a6b3d | 72 | r = type_system_get_type(&type_system_root, &nl_type, type); |
d8e538ec TG |
73 | if (r < 0) |
74 | return r; | |
75 | ||
12b7dff4 DH |
76 | if (type_get_type(nl_type) != NETLINK_TYPE_NESTED) |
77 | return -EINVAL; | |
78 | ||
1b89cf56 | 79 | r = message_new_empty(rtnl, &m); |
d8e538ec TG |
80 | if (r < 0) |
81 | return r; | |
82 | ||
817d1cd8 | 83 | size = NLMSG_SPACE(type_get_size(nl_type)); |
1b89cf56 TG |
84 | |
85 | assert(size >= sizeof(struct nlmsghdr)); | |
86 | m->hdr = malloc0(size); | |
87 | if (!m->hdr) | |
88 | return -ENOMEM; | |
89 | ||
90 | m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; | |
91 | ||
f663aeb8 | 92 | type_get_type_system(nl_type, &m->containers[0].type_system); |
1b89cf56 TG |
93 | m->hdr->nlmsg_len = size; |
94 | m->hdr->nlmsg_type = type; | |
95 | ||
96 | *ret = m; | |
97 | m = NULL; | |
d8e538ec TG |
98 | |
99 | return 0; | |
100 | } | |
101 | ||
1c4baffc | 102 | int sd_netlink_message_request_dump(sd_netlink_message *m, int dump) { |
6e20c8f8 TG |
103 | assert_return(m, -EINVAL); |
104 | assert_return(m->hdr, -EINVAL); | |
20dff6c4 TG |
105 | assert_return(m->hdr->nlmsg_type == RTM_GETLINK || |
106 | m->hdr->nlmsg_type == RTM_GETADDR || | |
107 | m->hdr->nlmsg_type == RTM_GETROUTE || | |
108 | m->hdr->nlmsg_type == RTM_GETNEIGH, | |
6e20c8f8 TG |
109 | -EINVAL); |
110 | ||
111 | if (dump) | |
112 | m->hdr->nlmsg_flags |= NLM_F_DUMP; | |
113 | else | |
114 | m->hdr->nlmsg_flags &= ~NLM_F_DUMP; | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
1c4baffc | 119 | sd_netlink_message *sd_netlink_message_ref(sd_netlink_message *m) { |
65f568bb TG |
120 | if (m) |
121 | assert_se(REFCNT_INC(m->n_ref) >= 2); | |
122 | ||
123 | return m; | |
124 | } | |
125 | ||
1c4baffc | 126 | sd_netlink_message *sd_netlink_message_unref(sd_netlink_message *m) { |
f0c4b1c3 | 127 | if (m && REFCNT_DEC(m->n_ref) == 0) { |
3dd215e0 TG |
128 | unsigned i; |
129 | ||
65f568bb | 130 | free(m->hdr); |
3dd215e0 | 131 | |
9f5bbfe3 | 132 | for (i = 0; i <= m->n_containers; i++) |
f663aeb8 | 133 | free(m->containers[i].attributes); |
3dd215e0 | 134 | |
1c4baffc | 135 | sd_netlink_message_unref(m->next); |
1403f45a | 136 | |
65f568bb TG |
137 | free(m); |
138 | } | |
139 | ||
140 | return NULL; | |
141 | } | |
142 | ||
1c4baffc | 143 | int sd_netlink_message_get_type(sd_netlink_message *m, uint16_t *type) { |
65f568bb TG |
144 | assert_return(m, -EINVAL); |
145 | assert_return(type, -EINVAL); | |
146 | ||
147 | *type = m->hdr->nlmsg_type; | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
1c4baffc | 152 | int sd_netlink_message_is_broadcast(sd_netlink_message *m) { |
1f0db3ed TG |
153 | assert_return(m, -EINVAL); |
154 | ||
3f42446d | 155 | return m->broadcast; |
1f0db3ed TG |
156 | } |
157 | ||
4ebe732c ZJS |
158 | /* If successful the updated message will be correctly aligned, if |
159 | unsuccessful the old message is untouched. */ | |
1c4baffc | 160 | static int add_rtattr(sd_netlink_message *m, unsigned short type, const void *data, size_t data_length) { |
7ca1d319 TG |
161 | uint32_t rta_length; |
162 | size_t message_length, padding_length; | |
65f568bb TG |
163 | struct nlmsghdr *new_hdr; |
164 | struct rtattr *rta; | |
8e337e64 | 165 | char *padding; |
5a081409 | 166 | unsigned i; |
7ca1d319 | 167 | int offset; |
65f568bb | 168 | |
33125ac5 TG |
169 | assert(m); |
170 | assert(m->hdr); | |
e5c4350b | 171 | assert(!m->sealed); |
33125ac5 | 172 | assert(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len); |
7ca1d319 TG |
173 | assert(!data || data_length); |
174 | ||
175 | /* get offset of the new attribute */ | |
176 | offset = m->hdr->nlmsg_len; | |
65f568bb | 177 | |
8e337e64 | 178 | /* get the size of the new rta attribute (with padding at the end) */ |
65f568bb | 179 | rta_length = RTA_LENGTH(data_length); |
4ebe732c ZJS |
180 | |
181 | /* get the new message size (with padding at the end) */ | |
7ca1d319 | 182 | message_length = offset + RTA_ALIGN(rta_length); |
65f568bb TG |
183 | |
184 | /* realloc to fit the new attribute */ | |
185 | new_hdr = realloc(m->hdr, message_length); | |
186 | if (!new_hdr) | |
187 | return -ENOMEM; | |
188 | m->hdr = new_hdr; | |
189 | ||
190 | /* get pointer to the attribute we are about to add */ | |
7ca1d319 | 191 | rta = (struct rtattr *) ((uint8_t *) m->hdr + offset); |
65f568bb | 192 | |
5a081409 TG |
193 | /* if we are inside containers, extend them */ |
194 | for (i = 0; i < m->n_containers; i++) | |
7ca1d319 | 195 | GET_CONTAINER(m, i)->rta_len += message_length - offset; |
33125ac5 | 196 | |
65f568bb TG |
197 | /* fill in the attribute */ |
198 | rta->rta_type = type; | |
199 | rta->rta_len = rta_length; | |
7ca1d319 | 200 | if (data) |
33125ac5 TG |
201 | /* we don't deal with the case where the user lies about the type |
202 | * and gives us too little data (so don't do that) | |
7ca1d319 | 203 | */ |
33125ac5 | 204 | padding = mempcpy(RTA_DATA(rta), data, data_length); |
7ca1d319 TG |
205 | else { |
206 | /* if no data was passed, make sure we still initialize the padding | |
207 | note that we can have data_length > 0 (used by some containers) */ | |
208 | padding = RTA_DATA(rta); | |
33125ac5 | 209 | } |
65f568bb | 210 | |
7ca1d319 TG |
211 | /* make sure also the padding at the end of the message is initialized */ |
212 | padding_length = (uint8_t*)m->hdr + message_length - (uint8_t*)padding; | |
213 | memzero(padding, padding_length); | |
214 | ||
4ebe732c ZJS |
215 | /* update message size */ |
216 | m->hdr->nlmsg_len = message_length; | |
217 | ||
7ca1d319 | 218 | return offset; |
65f568bb TG |
219 | } |
220 | ||
6c14ad61 | 221 | static int message_attribute_has_type(sd_netlink_message *m, size_t *out_size, uint16_t attribute_type, uint16_t data_type) { |
d8e538ec TG |
222 | const NLType *type; |
223 | int r; | |
224 | ||
6c14ad61 DH |
225 | assert(m); |
226 | ||
f663aeb8 | 227 | r = type_system_get_type(m->containers[m->n_containers].type_system, &type, attribute_type); |
d8e538ec TG |
228 | if (r < 0) |
229 | return r; | |
230 | ||
817d1cd8 | 231 | if (type_get_type(type) != data_type) |
d8e538ec TG |
232 | return -EINVAL; |
233 | ||
6c14ad61 DH |
234 | if (out_size) |
235 | *out_size = type_get_size(type); | |
236 | return 0; | |
d8e538ec TG |
237 | } |
238 | ||
1c4baffc | 239 | int sd_netlink_message_append_string(sd_netlink_message *m, unsigned short type, const char *data) { |
d8e538ec | 240 | size_t length, size; |
0a0dc69b | 241 | int r; |
65f568bb TG |
242 | |
243 | assert_return(m, -EINVAL); | |
e5c4350b | 244 | assert_return(!m->sealed, -EPERM); |
65f568bb TG |
245 | assert_return(data, -EINVAL); |
246 | ||
6c14ad61 | 247 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_STRING); |
0a0dc69b TG |
248 | if (r < 0) |
249 | return r; | |
65f568bb | 250 | |
d8e538ec | 251 | if (size) { |
3072eecf LP |
252 | length = strnlen(data, size+1); |
253 | if (length > size) | |
d8e538ec TG |
254 | return -EINVAL; |
255 | } else | |
256 | length = strlen(data); | |
33125ac5 | 257 | |
d8e538ec | 258 | r = add_rtattr(m, type, data, length + 1); |
0a0dc69b TG |
259 | if (r < 0) |
260 | return r; | |
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
1c4baffc | 265 | int sd_netlink_message_append_u8(sd_netlink_message *m, unsigned short type, uint8_t data) { |
7b179640 SS |
266 | int r; |
267 | ||
268 | assert_return(m, -EINVAL); | |
269 | assert_return(!m->sealed, -EPERM); | |
270 | ||
6c14ad61 | 271 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U8); |
7b179640 SS |
272 | if (r < 0) |
273 | return r; | |
274 | ||
7b179640 SS |
275 | r = add_rtattr(m, type, &data, sizeof(uint8_t)); |
276 | if (r < 0) | |
277 | return r; | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
282 | ||
1c4baffc | 283 | int sd_netlink_message_append_u16(sd_netlink_message *m, unsigned short type, uint16_t data) { |
01b36069 TG |
284 | int r; |
285 | ||
286 | assert_return(m, -EINVAL); | |
e5c4350b | 287 | assert_return(!m->sealed, -EPERM); |
01b36069 | 288 | |
6c14ad61 | 289 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U16); |
01b36069 TG |
290 | if (r < 0) |
291 | return r; | |
292 | ||
01b36069 TG |
293 | r = add_rtattr(m, type, &data, sizeof(uint16_t)); |
294 | if (r < 0) | |
295 | return r; | |
296 | ||
297 | return 0; | |
298 | } | |
299 | ||
1c4baffc | 300 | int sd_netlink_message_append_u32(sd_netlink_message *m, unsigned short type, uint32_t data) { |
0a0dc69b TG |
301 | int r; |
302 | ||
303 | assert_return(m, -EINVAL); | |
e5c4350b | 304 | assert_return(!m->sealed, -EPERM); |
0a0dc69b | 305 | |
6c14ad61 | 306 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U32); |
0a0dc69b TG |
307 | if (r < 0) |
308 | return r; | |
309 | ||
4d47756b | 310 | r = add_rtattr(m, type, &data, sizeof(uint32_t)); |
0a0dc69b TG |
311 | if (r < 0) |
312 | return r; | |
313 | ||
314 | return 0; | |
315 | } | |
316 | ||
1c4baffc | 317 | int sd_netlink_message_append_in_addr(sd_netlink_message *m, unsigned short type, const struct in_addr *data) { |
0a0dc69b TG |
318 | int r; |
319 | ||
320 | assert_return(m, -EINVAL); | |
e5c4350b | 321 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
322 | assert_return(data, -EINVAL); |
323 | ||
6c14ad61 | 324 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
0a0dc69b TG |
325 | if (r < 0) |
326 | return r; | |
327 | ||
4d47756b | 328 | r = add_rtattr(m, type, data, sizeof(struct in_addr)); |
0a0dc69b TG |
329 | if (r < 0) |
330 | return r; | |
331 | ||
332 | return 0; | |
333 | } | |
334 | ||
1c4baffc | 335 | int sd_netlink_message_append_in6_addr(sd_netlink_message *m, unsigned short type, const struct in6_addr *data) { |
0a0dc69b TG |
336 | int r; |
337 | ||
338 | assert_return(m, -EINVAL); | |
e5c4350b | 339 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
340 | assert_return(data, -EINVAL); |
341 | ||
6c14ad61 | 342 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
0a0dc69b TG |
343 | if (r < 0) |
344 | return r; | |
345 | ||
4d47756b | 346 | r = add_rtattr(m, type, data, sizeof(struct in6_addr)); |
0a0dc69b TG |
347 | if (r < 0) |
348 | return r; | |
349 | ||
350 | return 0; | |
351 | } | |
352 | ||
1c4baffc | 353 | int sd_netlink_message_append_ether_addr(sd_netlink_message *m, unsigned short type, const struct ether_addr *data) { |
0a0dc69b TG |
354 | int r; |
355 | ||
356 | assert_return(m, -EINVAL); | |
e5c4350b | 357 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
358 | assert_return(data, -EINVAL); |
359 | ||
6c14ad61 | 360 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_ETHER_ADDR); |
d8e538ec TG |
361 | if (r < 0) |
362 | return r; | |
0a0dc69b | 363 | |
b9eaf3d1 | 364 | r = add_rtattr(m, type, data, ETH_ALEN); |
0a0dc69b TG |
365 | if (r < 0) |
366 | return r; | |
367 | ||
368 | return 0; | |
65f568bb TG |
369 | } |
370 | ||
1c4baffc | 371 | int sd_netlink_message_append_cache_info(sd_netlink_message *m, unsigned short type, const struct ifa_cacheinfo *info) { |
aba496a5 UTL |
372 | int r; |
373 | ||
374 | assert_return(m, -EINVAL); | |
375 | assert_return(!m->sealed, -EPERM); | |
376 | assert_return(info, -EINVAL); | |
377 | ||
6c14ad61 | 378 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_CACHE_INFO); |
aba496a5 UTL |
379 | if (r < 0) |
380 | return r; | |
381 | ||
382 | r = add_rtattr(m, type, info, sizeof(struct ifa_cacheinfo)); | |
383 | if (r < 0) | |
384 | return r; | |
385 | ||
386 | return 0; | |
387 | } | |
388 | ||
1c4baffc | 389 | int sd_netlink_message_open_container(sd_netlink_message *m, unsigned short type) { |
d8e538ec TG |
390 | size_t size; |
391 | int r; | |
33125ac5 | 392 | |
65f568bb | 393 | assert_return(m, -EINVAL); |
e5c4350b | 394 | assert_return(!m->sealed, -EPERM); |
7ca1d319 | 395 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -ERANGE); |
33125ac5 | 396 | |
6c14ad61 | 397 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_NESTED); |
4af7b60d TG |
398 | if (r < 0) { |
399 | const NLTypeSystemUnion *type_system_union; | |
400 | int family; | |
401 | ||
6c14ad61 | 402 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_UNION); |
4af7b60d TG |
403 | if (r < 0) |
404 | return r; | |
4af7b60d | 405 | |
89489ef7 | 406 | r = sd_rtnl_message_get_family(m, &family); |
4af7b60d TG |
407 | if (r < 0) |
408 | return r; | |
409 | ||
f663aeb8 | 410 | r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, &type_system_union, type); |
4af7b60d TG |
411 | if (r < 0) |
412 | return r; | |
413 | ||
414 | r = type_system_union_protocol_get_type_system(type_system_union, | |
f663aeb8 | 415 | &m->containers[m->n_containers + 1].type_system, |
4af7b60d TG |
416 | family); |
417 | if (r < 0) | |
418 | return r; | |
419 | } else { | |
f663aeb8 TG |
420 | r = type_system_get_type_system(m->containers[m->n_containers].type_system, |
421 | &m->containers[m->n_containers + 1].type_system, | |
4af7b60d TG |
422 | type); |
423 | if (r < 0) | |
424 | return r; | |
425 | } | |
31a4e153 | 426 | |
fcf81a54 | 427 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, size); |
d8e538ec TG |
428 | if (r < 0) |
429 | return r; | |
430 | ||
f663aeb8 | 431 | m->containers[m->n_containers ++].offset = r; |
7ca1d319 | 432 | |
d8e538ec TG |
433 | return 0; |
434 | } | |
435 | ||
1c4baffc | 436 | int sd_netlink_message_open_container_union(sd_netlink_message *m, unsigned short type, const char *key) { |
d8e538ec TG |
437 | const NLTypeSystemUnion *type_system_union; |
438 | int r; | |
439 | ||
440 | assert_return(m, -EINVAL); | |
441 | assert_return(!m->sealed, -EPERM); | |
442 | ||
f663aeb8 | 443 | r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, &type_system_union, type); |
d8e538ec TG |
444 | if (r < 0) |
445 | return r; | |
446 | ||
447 | r = type_system_union_get_type_system(type_system_union, | |
f663aeb8 | 448 | &m->containers[m->n_containers + 1].type_system, |
d8e538ec TG |
449 | key); |
450 | if (r < 0) | |
451 | return r; | |
33125ac5 | 452 | |
1c4baffc | 453 | r = sd_netlink_message_append_string(m, type_system_union->match, key); |
d8e538ec TG |
454 | if (r < 0) |
455 | return r; | |
456 | ||
457 | /* do we evere need non-null size */ | |
da041d69 | 458 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, 0); |
d8e538ec TG |
459 | if (r < 0) |
460 | return r; | |
461 | ||
f663aeb8 | 462 | m->containers[m->n_containers ++].offset = r; |
7ca1d319 | 463 | |
d8e538ec | 464 | return 0; |
33125ac5 TG |
465 | } |
466 | ||
d8e538ec | 467 | |
1c4baffc | 468 | int sd_netlink_message_close_container(sd_netlink_message *m) { |
33125ac5 | 469 | assert_return(m, -EINVAL); |
e5c4350b | 470 | assert_return(!m->sealed, -EPERM); |
5a081409 | 471 | assert_return(m->n_containers > 0, -EINVAL); |
33125ac5 | 472 | |
f663aeb8 | 473 | m->containers[m->n_containers].type_system = NULL; |
5a081409 | 474 | m->n_containers --; |
33125ac5 TG |
475 | |
476 | return 0; | |
477 | } | |
478 | ||
4c641e99 | 479 | static int netlink_message_read_internal(sd_netlink_message *m, unsigned short type, void **data, bool *net_byteorder) { |
f663aeb8 | 480 | struct netlink_attribute *attribute; |
f66eeb6b TG |
481 | struct rtattr *rta; |
482 | ||
44caa5e7 SS |
483 | assert_return(m, -EINVAL); |
484 | assert_return(m->sealed, -EPERM); | |
485 | assert_return(data, -EINVAL); | |
d8e538ec | 486 | assert(m->n_containers <= RTNL_CONTAINER_DEPTH); |
f663aeb8 TG |
487 | assert(m->containers[m->n_containers].attributes); |
488 | assert(type < m->containers[m->n_containers].n_attributes); | |
44caa5e7 | 489 | |
f663aeb8 TG |
490 | attribute = &m->containers[m->n_containers].attributes[type]; |
491 | ||
492 | if(!attribute->offset) | |
44caa5e7 SS |
493 | return -ENODATA; |
494 | ||
f663aeb8 | 495 | rta = (struct rtattr*)((uint8_t *) m->hdr + attribute->offset); |
44caa5e7 | 496 | |
f66eeb6b TG |
497 | *data = RTA_DATA(rta); |
498 | ||
4c641e99 TG |
499 | if (net_byteorder) |
500 | *net_byteorder = attribute->net_byteorder; | |
501 | ||
f66eeb6b | 502 | return RTA_PAYLOAD(rta); |
44caa5e7 SS |
503 | } |
504 | ||
1c4baffc | 505 | int sd_netlink_message_read_string(sd_netlink_message *m, unsigned short type, const char **data) { |
44caa5e7 SS |
506 | int r; |
507 | void *attr_data; | |
508 | ||
73ae2b7d TG |
509 | assert_return(m, -EINVAL); |
510 | ||
6c14ad61 | 511 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_STRING); |
d8e538ec TG |
512 | if (r < 0) |
513 | return r; | |
44caa5e7 | 514 | |
4c641e99 | 515 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
f66eeb6b | 516 | if (r < 0) |
44caa5e7 | 517 | return r; |
f66eeb6b TG |
518 | else if (strnlen(attr_data, r) >= (size_t) r) |
519 | return -EIO; | |
44caa5e7 | 520 | |
73ae2b7d TG |
521 | if (data) |
522 | *data = (const char *) attr_data; | |
44caa5e7 SS |
523 | |
524 | return 0; | |
525 | } | |
526 | ||
1c4baffc | 527 | int sd_netlink_message_read_u8(sd_netlink_message *m, unsigned short type, uint8_t *data) { |
44caa5e7 SS |
528 | int r; |
529 | void *attr_data; | |
530 | ||
73ae2b7d TG |
531 | assert_return(m, -EINVAL); |
532 | ||
6c14ad61 | 533 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U8); |
d8e538ec TG |
534 | if (r < 0) |
535 | return r; | |
44caa5e7 | 536 | |
4c641e99 | 537 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
f66eeb6b | 538 | if (r < 0) |
44caa5e7 | 539 | return r; |
f66eeb6b TG |
540 | else if ((size_t) r < sizeof(uint8_t)) |
541 | return -EIO; | |
44caa5e7 | 542 | |
73ae2b7d TG |
543 | if (data) |
544 | *data = *(uint8_t *) attr_data; | |
44caa5e7 SS |
545 | |
546 | return 0; | |
547 | } | |
548 | ||
1c4baffc | 549 | int sd_netlink_message_read_u16(sd_netlink_message *m, unsigned short type, uint16_t *data) { |
44caa5e7 | 550 | void *attr_data; |
4c641e99 TG |
551 | bool net_byteorder; |
552 | int r; | |
44caa5e7 | 553 | |
73ae2b7d TG |
554 | assert_return(m, -EINVAL); |
555 | ||
6c14ad61 | 556 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U16); |
d8e538ec TG |
557 | if (r < 0) |
558 | return r; | |
44caa5e7 | 559 | |
4c641e99 | 560 | r = netlink_message_read_internal(m, type, &attr_data, &net_byteorder); |
f66eeb6b | 561 | if (r < 0) |
44caa5e7 | 562 | return r; |
f66eeb6b TG |
563 | else if ((size_t) r < sizeof(uint16_t)) |
564 | return -EIO; | |
44caa5e7 | 565 | |
4c641e99 TG |
566 | if (data) { |
567 | if (net_byteorder) | |
568 | *data = be16toh(*(uint16_t *) attr_data); | |
569 | else | |
570 | *data = *(uint16_t *) attr_data; | |
571 | } | |
44caa5e7 SS |
572 | |
573 | return 0; | |
574 | } | |
575 | ||
1c4baffc | 576 | int sd_netlink_message_read_u32(sd_netlink_message *m, unsigned short type, uint32_t *data) { |
44caa5e7 | 577 | void *attr_data; |
4c641e99 TG |
578 | bool net_byteorder; |
579 | int r; | |
44caa5e7 | 580 | |
73ae2b7d TG |
581 | assert_return(m, -EINVAL); |
582 | ||
6c14ad61 | 583 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U32); |
d8e538ec TG |
584 | if (r < 0) |
585 | return r; | |
44caa5e7 | 586 | |
4c641e99 | 587 | r = netlink_message_read_internal(m, type, &attr_data, &net_byteorder); |
f66eeb6b | 588 | if (r < 0) |
44caa5e7 | 589 | return r; |
f66eeb6b TG |
590 | else if ((size_t)r < sizeof(uint32_t)) |
591 | return -EIO; | |
44caa5e7 | 592 | |
4c641e99 TG |
593 | if (data) { |
594 | if (net_byteorder) | |
595 | *data = be32toh(*(uint32_t *) attr_data); | |
596 | else | |
597 | *data = *(uint32_t *) attr_data; | |
598 | } | |
44caa5e7 SS |
599 | |
600 | return 0; | |
601 | } | |
602 | ||
1c4baffc | 603 | int sd_netlink_message_read_ether_addr(sd_netlink_message *m, unsigned short type, struct ether_addr *data) { |
4e9e7f18 SS |
604 | int r; |
605 | void *attr_data; | |
606 | ||
73ae2b7d TG |
607 | assert_return(m, -EINVAL); |
608 | ||
6c14ad61 | 609 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_ETHER_ADDR); |
d8e538ec TG |
610 | if (r < 0) |
611 | return r; | |
4e9e7f18 | 612 | |
4c641e99 | 613 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
f66eeb6b | 614 | if (r < 0) |
4e9e7f18 | 615 | return r; |
f66eeb6b TG |
616 | else if ((size_t)r < sizeof(struct ether_addr)) |
617 | return -EIO; | |
4e9e7f18 | 618 | |
73ae2b7d TG |
619 | if (data) |
620 | memcpy(data, attr_data, sizeof(struct ether_addr)); | |
4e9e7f18 SS |
621 | |
622 | return 0; | |
623 | } | |
624 | ||
1c4baffc | 625 | int sd_netlink_message_read_cache_info(sd_netlink_message *m, unsigned short type, struct ifa_cacheinfo *info) { |
aba496a5 UTL |
626 | int r; |
627 | void *attr_data; | |
628 | ||
73ae2b7d TG |
629 | assert_return(m, -EINVAL); |
630 | ||
6c14ad61 | 631 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_CACHE_INFO); |
aba496a5 UTL |
632 | if (r < 0) |
633 | return r; | |
634 | ||
4c641e99 | 635 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
aba496a5 UTL |
636 | if (r < 0) |
637 | return r; | |
638 | else if ((size_t)r < sizeof(struct ifa_cacheinfo)) | |
639 | return -EIO; | |
640 | ||
73ae2b7d TG |
641 | if (info) |
642 | memcpy(info, attr_data, sizeof(struct ifa_cacheinfo)); | |
aba496a5 UTL |
643 | |
644 | return 0; | |
645 | } | |
646 | ||
1c4baffc | 647 | int sd_netlink_message_read_in_addr(sd_netlink_message *m, unsigned short type, struct in_addr *data) { |
4e9e7f18 SS |
648 | int r; |
649 | void *attr_data; | |
650 | ||
73ae2b7d TG |
651 | assert_return(m, -EINVAL); |
652 | ||
6c14ad61 | 653 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
d8e538ec TG |
654 | if (r < 0) |
655 | return r; | |
4e9e7f18 | 656 | |
4c641e99 | 657 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
f66eeb6b | 658 | if (r < 0) |
4e9e7f18 | 659 | return r; |
f66eeb6b TG |
660 | else if ((size_t)r < sizeof(struct in_addr)) |
661 | return -EIO; | |
4e9e7f18 | 662 | |
73ae2b7d TG |
663 | if (data) |
664 | memcpy(data, attr_data, sizeof(struct in_addr)); | |
4e9e7f18 SS |
665 | |
666 | return 0; | |
667 | } | |
668 | ||
1c4baffc | 669 | int sd_netlink_message_read_in6_addr(sd_netlink_message *m, unsigned short type, struct in6_addr *data) { |
4e9e7f18 SS |
670 | int r; |
671 | void *attr_data; | |
672 | ||
73ae2b7d TG |
673 | assert_return(m, -EINVAL); |
674 | ||
6c14ad61 | 675 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
d8e538ec TG |
676 | if (r < 0) |
677 | return r; | |
4e9e7f18 | 678 | |
4c641e99 | 679 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
3dd215e0 | 680 | if (r < 0) |
4e9e7f18 | 681 | return r; |
3dd215e0 TG |
682 | else if ((size_t)r < sizeof(struct in6_addr)) |
683 | return -EIO; | |
4e9e7f18 | 684 | |
73ae2b7d TG |
685 | if (data) |
686 | memcpy(data, attr_data, sizeof(struct in6_addr)); | |
4e9e7f18 SS |
687 | |
688 | return 0; | |
689 | } | |
690 | ||
f663aeb8 TG |
691 | static int netlink_container_parse(sd_netlink_message *m, |
692 | struct netlink_container *container, | |
693 | int count, | |
694 | struct rtattr *rta, | |
695 | unsigned int rt_len) { | |
696 | _cleanup_free_ struct netlink_attribute *attributes = NULL; | |
4203fc8b | 697 | |
f663aeb8 TG |
698 | attributes = new0(struct netlink_attribute, count); |
699 | if(!attributes) | |
4203fc8b TG |
700 | return -ENOMEM; |
701 | ||
4203fc8b | 702 | for (; RTA_OK(rta, rt_len); rta = RTA_NEXT(rta, rt_len)) { |
f663aeb8 TG |
703 | unsigned short type; |
704 | ||
4203fc8b TG |
705 | type = RTA_TYPE(rta); |
706 | ||
707 | /* if the kernel is newer than the headers we used | |
f663aeb8 | 708 | when building, we ignore out-of-range attributes */ |
4203fc8b TG |
709 | if (type >= count) |
710 | continue; | |
711 | ||
f663aeb8 | 712 | if (attributes[type].offset) |
4203fc8b TG |
713 | log_debug("rtnl: message parse - overwriting repeated attribute"); |
714 | ||
f663aeb8 | 715 | attributes[type].offset = (uint8_t *) rta - (uint8_t *) m->hdr; |
4c641e99 TG |
716 | attributes[type].nested = RTA_FLAGS(rta) & NLA_F_NESTED; |
717 | attributes[type].net_byteorder = RTA_FLAGS(rta) & NLA_F_NET_BYTEORDER; | |
4203fc8b TG |
718 | } |
719 | ||
f663aeb8 TG |
720 | container->attributes = attributes; |
721 | attributes = NULL; | |
722 | container->n_attributes = count; | |
4203fc8b TG |
723 | |
724 | return 0; | |
725 | } | |
726 | ||
817d1cd8 | 727 | int sd_netlink_message_enter_container(sd_netlink_message *m, unsigned short type_id) { |
d8e538ec TG |
728 | const NLType *nl_type; |
729 | const NLTypeSystem *type_system; | |
3dd215e0 | 730 | void *container; |
817d1cd8 | 731 | uint16_t type; |
d8e538ec TG |
732 | size_t size; |
733 | int r; | |
3dd215e0 TG |
734 | |
735 | assert_return(m, -EINVAL); | |
736 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -EINVAL); | |
737 | ||
f663aeb8 | 738 | r = type_system_get_type(m->containers[m->n_containers].type_system, |
d8e538ec | 739 | &nl_type, |
817d1cd8 | 740 | type_id); |
3dd215e0 TG |
741 | if (r < 0) |
742 | return r; | |
3dd215e0 | 743 | |
817d1cd8 DH |
744 | type = type_get_type(nl_type); |
745 | ||
746 | if (type == NETLINK_TYPE_NESTED) { | |
f663aeb8 | 747 | r = type_system_get_type_system(m->containers[m->n_containers].type_system, |
d8e538ec | 748 | &type_system, |
817d1cd8 | 749 | type_id); |
d8e538ec TG |
750 | if (r < 0) |
751 | return r; | |
817d1cd8 | 752 | } else if (type == NETLINK_TYPE_UNION) { |
d8e538ec | 753 | const NLTypeSystemUnion *type_system_union; |
d8e538ec | 754 | |
f663aeb8 | 755 | r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, |
d8e538ec | 756 | &type_system_union, |
817d1cd8 | 757 | type_id); |
d8e538ec TG |
758 | if (r < 0) |
759 | return r; | |
760 | ||
4af7b60d TG |
761 | switch (type_system_union->match_type) { |
762 | case NL_MATCH_SIBLING: | |
763 | { | |
764 | const char *key; | |
765 | ||
1c4baffc | 766 | r = sd_netlink_message_read_string(m, type_system_union->match, &key); |
4af7b60d TG |
767 | if (r < 0) |
768 | return r; | |
769 | ||
770 | r = type_system_union_get_type_system(type_system_union, | |
771 | &type_system, | |
772 | key); | |
773 | if (r < 0) | |
774 | return r; | |
775 | ||
776 | break; | |
777 | } | |
778 | case NL_MATCH_PROTOCOL: | |
779 | { | |
780 | int family; | |
781 | ||
89489ef7 | 782 | r = sd_rtnl_message_get_family(m, &family); |
4af7b60d TG |
783 | if (r < 0) |
784 | return r; | |
785 | ||
786 | r = type_system_union_protocol_get_type_system(type_system_union, | |
787 | &type_system, | |
788 | family); | |
789 | if (r < 0) | |
790 | return r; | |
791 | ||
792 | break; | |
793 | } | |
794 | default: | |
1c4baffc | 795 | assert_not_reached("sd-netlink: invalid type system union type"); |
4af7b60d | 796 | } |
d8e538ec TG |
797 | } else |
798 | return -EINVAL; | |
799 | ||
4c641e99 | 800 | r = netlink_message_read_internal(m, type_id, &container, NULL); |
3dd215e0 TG |
801 | if (r < 0) |
802 | return r; | |
d8e538ec TG |
803 | else |
804 | size = (size_t)r; | |
3dd215e0 | 805 | |
d8e538ec | 806 | m->n_containers ++; |
3dd215e0 | 807 | |
f663aeb8 TG |
808 | r = netlink_container_parse(m, |
809 | &m->containers[m->n_containers], | |
810 | type_system_get_count(type_system), | |
811 | container, | |
812 | size); | |
d8e538ec TG |
813 | if (r < 0) { |
814 | m->n_containers --; | |
3dd215e0 | 815 | return r; |
d8e538ec | 816 | } |
3dd215e0 | 817 | |
f663aeb8 | 818 | m->containers[m->n_containers].type_system = type_system; |
3dd215e0 TG |
819 | |
820 | return 0; | |
821 | } | |
822 | ||
1c4baffc | 823 | int sd_netlink_message_exit_container(sd_netlink_message *m) { |
e5c4350b TG |
824 | assert_return(m, -EINVAL); |
825 | assert_return(m->sealed, -EINVAL); | |
826 | assert_return(m->n_containers > 0, -EINVAL); | |
827 | ||
f663aeb8 TG |
828 | free(m->containers[m->n_containers].attributes); |
829 | m->containers[m->n_containers].attributes = NULL; | |
830 | m->containers[m->n_containers].type_system = NULL; | |
3dd215e0 | 831 | |
e5c4350b TG |
832 | m->n_containers --; |
833 | ||
834 | return 0; | |
835 | } | |
836 | ||
1c4baffc | 837 | uint32_t rtnl_message_get_serial(sd_netlink_message *m) { |
65f568bb | 838 | assert(m); |
9d0db178 | 839 | assert(m->hdr); |
65f568bb TG |
840 | |
841 | return m->hdr->nlmsg_seq; | |
842 | } | |
843 | ||
1c4baffc | 844 | int sd_netlink_message_is_error(sd_netlink_message *m) { |
45af44d4 TG |
845 | assert_return(m, 0); |
846 | assert_return(m->hdr, 0); | |
847 | ||
848 | return m->hdr->nlmsg_type == NLMSG_ERROR; | |
849 | } | |
850 | ||
1c4baffc | 851 | int sd_netlink_message_get_errno(sd_netlink_message *m) { |
65f568bb TG |
852 | struct nlmsgerr *err; |
853 | ||
e16bcf98 | 854 | assert_return(m, -EINVAL); |
9d0db178 | 855 | assert_return(m->hdr, -EINVAL); |
65f568bb | 856 | |
1c4baffc | 857 | if (!sd_netlink_message_is_error(m)) |
65f568bb TG |
858 | return 0; |
859 | ||
860 | err = NLMSG_DATA(m->hdr); | |
861 | ||
862 | return err->error; | |
863 | } | |
864 | ||
1c4baffc | 865 | int sd_netlink_message_rewind(sd_netlink_message *m) { |
817d1cd8 DH |
866 | const NLType *nl_type; |
867 | uint16_t type; | |
868 | size_t size; | |
3dd215e0 TG |
869 | unsigned i; |
870 | int r; | |
0fc7531b TG |
871 | |
872 | assert_return(m, -EINVAL); | |
0fc7531b | 873 | |
3dd215e0 TG |
874 | /* don't allow appending to message once parsed */ |
875 | if (!m->sealed) | |
876 | rtnl_message_seal(m); | |
877 | ||
878 | for (i = 1; i <= m->n_containers; i++) { | |
f663aeb8 TG |
879 | free(m->containers[i].attributes); |
880 | m->containers[i].attributes = NULL; | |
3dd215e0 TG |
881 | } |
882 | ||
883 | m->n_containers = 0; | |
884 | ||
f663aeb8 | 885 | if (m->containers[0].attributes) { |
3dd215e0 TG |
886 | /* top-level attributes have already been parsed */ |
887 | return 0; | |
888 | } | |
889 | ||
d8e538ec TG |
890 | assert(m->hdr); |
891 | ||
846a6b3d | 892 | r = type_system_get_type(&type_system_root, &nl_type, m->hdr->nlmsg_type); |
d8e538ec TG |
893 | if (r < 0) |
894 | return r; | |
895 | ||
817d1cd8 DH |
896 | type = type_get_type(nl_type); |
897 | size = type_get_size(nl_type); | |
898 | ||
899 | if (type == NETLINK_TYPE_NESTED) { | |
c658008f | 900 | const NLTypeSystem *type_system; |
d8e538ec | 901 | |
817d1cd8 | 902 | type_get_type_system(nl_type, &type_system); |
d8e538ec | 903 | |
f663aeb8 | 904 | m->containers[0].type_system = type_system; |
d8e538ec | 905 | |
f663aeb8 TG |
906 | r = netlink_container_parse(m, |
907 | &m->containers[m->n_containers], | |
908 | type_system_get_count(type_system), | |
909 | (struct rtattr*)((uint8_t*)NLMSG_DATA(m->hdr) + NLMSG_ALIGN(size)), | |
910 | NLMSG_PAYLOAD(m->hdr, size)); | |
d8e538ec TG |
911 | if (r < 0) |
912 | return r; | |
0fc7531b TG |
913 | } |
914 | ||
915 | return 0; | |
916 | } | |
3dd215e0 | 917 | |
1c4baffc | 918 | void rtnl_message_seal(sd_netlink_message *m) { |
3dd215e0 TG |
919 | assert(m); |
920 | assert(!m->sealed); | |
921 | ||
922 | m->sealed = true; | |
923 | } | |
1403f45a | 924 | |
1c4baffc | 925 | sd_netlink_message *sd_netlink_message_next(sd_netlink_message *m) { |
1403f45a TG |
926 | assert_return(m, NULL); |
927 | ||
928 | return m->next; | |
929 | } |