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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
65f568bb TG |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2013 Tom Gundersen <teg@jklm.no> | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
21 | #include <netinet/in.h> | |
65f568bb TG |
22 | #include <stdbool.h> |
23 | #include <unistd.h> | |
24 | ||
07630cea LP |
25 | #include "sd-netlink.h" |
26 | ||
b5efdb8a | 27 | #include "alloc-util.h" |
f97b34a6 | 28 | #include "format-util.h" |
d5eff740 | 29 | #include "missing.h" |
1c4baffc TG |
30 | #include "netlink-internal.h" |
31 | #include "netlink-types.h" | |
07630cea LP |
32 | #include "netlink-util.h" |
33 | #include "refcnt.h" | |
34 | #include "socket-util.h" | |
35 | #include "util.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) |
313cefa1 | 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 | 57 | m->n_ref = REFCNT_INIT; |
05d0c2e3 | 58 | m->protocol = rtnl->protocol; |
65f568bb TG |
59 | m->sealed = false; |
60 | ||
61 | *ret = m; | |
62 | ||
63 | return 0; | |
64 | } | |
65 | ||
1c4baffc | 66 | int message_new(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t type) { |
4afd3348 | 67 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
d8e538ec | 68 | const NLType *nl_type; |
05d0c2e3 | 69 | const NLTypeSystem *type_system_root; |
d8e538ec TG |
70 | size_t size; |
71 | int r; | |
72 | ||
05d0c2e3 JT |
73 | assert_return(rtnl, -EINVAL); |
74 | ||
75 | type_system_root = type_system_get_root(rtnl->protocol); | |
76 | ||
77 | r = type_system_get_type(type_system_root, &nl_type, type); | |
d8e538ec TG |
78 | if (r < 0) |
79 | return r; | |
80 | ||
12b7dff4 DH |
81 | if (type_get_type(nl_type) != NETLINK_TYPE_NESTED) |
82 | return -EINVAL; | |
83 | ||
1b89cf56 | 84 | r = message_new_empty(rtnl, &m); |
d8e538ec TG |
85 | if (r < 0) |
86 | return r; | |
87 | ||
817d1cd8 | 88 | size = NLMSG_SPACE(type_get_size(nl_type)); |
1b89cf56 TG |
89 | |
90 | assert(size >= sizeof(struct nlmsghdr)); | |
91 | m->hdr = malloc0(size); | |
92 | if (!m->hdr) | |
93 | return -ENOMEM; | |
94 | ||
95 | m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; | |
96 | ||
f663aeb8 | 97 | type_get_type_system(nl_type, &m->containers[0].type_system); |
1b89cf56 TG |
98 | m->hdr->nlmsg_len = size; |
99 | m->hdr->nlmsg_type = type; | |
100 | ||
101 | *ret = m; | |
102 | m = NULL; | |
d8e538ec TG |
103 | |
104 | return 0; | |
105 | } | |
106 | ||
1c4baffc | 107 | int sd_netlink_message_request_dump(sd_netlink_message *m, int dump) { |
6e20c8f8 TG |
108 | assert_return(m, -EINVAL); |
109 | assert_return(m->hdr, -EINVAL); | |
bce67bbe SS |
110 | |
111 | assert_return(IN_SET(m->hdr->nlmsg_type, RTM_GETLINK, RTM_GETADDR, RTM_GETROUTE, RTM_GETNEIGH, RTM_GETRULE, RTM_GETADDRLABEL), -EINVAL); | |
6e20c8f8 | 112 | |
5883ff60 | 113 | SET_FLAG(m->hdr->nlmsg_flags, NLM_F_DUMP, dump); |
6e20c8f8 TG |
114 | |
115 | return 0; | |
116 | } | |
117 | ||
1c4baffc | 118 | sd_netlink_message *sd_netlink_message_ref(sd_netlink_message *m) { |
f1dd72c2 LP |
119 | if (!m) |
120 | return NULL; | |
65f568bb | 121 | |
f1dd72c2 | 122 | assert_se(REFCNT_INC(m->n_ref) >= 2); |
65f568bb TG |
123 | return m; |
124 | } | |
125 | ||
1c4baffc | 126 | sd_netlink_message *sd_netlink_message_unref(sd_netlink_message *m) { |
82e4eda6 DH |
127 | sd_netlink_message *t; |
128 | ||
129 | while (m && REFCNT_DEC(m->n_ref) == 0) { | |
3dd215e0 TG |
130 | unsigned i; |
131 | ||
65f568bb | 132 | free(m->hdr); |
3dd215e0 | 133 | |
9f5bbfe3 | 134 | for (i = 0; i <= m->n_containers; i++) |
f663aeb8 | 135 | free(m->containers[i].attributes); |
3dd215e0 | 136 | |
82e4eda6 DH |
137 | t = m; |
138 | m = m->next; | |
139 | free(t); | |
65f568bb TG |
140 | } |
141 | ||
142 | return NULL; | |
143 | } | |
144 | ||
1c4baffc | 145 | int sd_netlink_message_get_type(sd_netlink_message *m, uint16_t *type) { |
65f568bb TG |
146 | assert_return(m, -EINVAL); |
147 | assert_return(type, -EINVAL); | |
148 | ||
149 | *type = m->hdr->nlmsg_type; | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
c06cb593 SS |
154 | int sd_netlink_message_set_flags(sd_netlink_message *m, uint16_t flags) { |
155 | assert_return(m, -EINVAL); | |
156 | assert_return(flags, -EINVAL); | |
157 | ||
158 | m->hdr->nlmsg_flags = flags; | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
1c4baffc | 163 | int sd_netlink_message_is_broadcast(sd_netlink_message *m) { |
1f0db3ed TG |
164 | assert_return(m, -EINVAL); |
165 | ||
3f42446d | 166 | return m->broadcast; |
1f0db3ed TG |
167 | } |
168 | ||
4ebe732c ZJS |
169 | /* If successful the updated message will be correctly aligned, if |
170 | unsuccessful the old message is untouched. */ | |
1c4baffc | 171 | static int add_rtattr(sd_netlink_message *m, unsigned short type, const void *data, size_t data_length) { |
7ca1d319 TG |
172 | uint32_t rta_length; |
173 | size_t message_length, padding_length; | |
65f568bb TG |
174 | struct nlmsghdr *new_hdr; |
175 | struct rtattr *rta; | |
8e337e64 | 176 | char *padding; |
5a081409 | 177 | unsigned i; |
7ca1d319 | 178 | int offset; |
65f568bb | 179 | |
33125ac5 TG |
180 | assert(m); |
181 | assert(m->hdr); | |
e5c4350b | 182 | assert(!m->sealed); |
33125ac5 | 183 | assert(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len); |
7ca1d319 TG |
184 | assert(!data || data_length); |
185 | ||
186 | /* get offset of the new attribute */ | |
187 | offset = m->hdr->nlmsg_len; | |
65f568bb | 188 | |
8e337e64 | 189 | /* get the size of the new rta attribute (with padding at the end) */ |
65f568bb | 190 | rta_length = RTA_LENGTH(data_length); |
4ebe732c ZJS |
191 | |
192 | /* get the new message size (with padding at the end) */ | |
7ca1d319 | 193 | message_length = offset + RTA_ALIGN(rta_length); |
65f568bb | 194 | |
05d0c2e3 JT |
195 | /* buffer should be smaller than both one page or 8K to be accepted by the kernel */ |
196 | if (message_length > MIN(page_size(), 8192UL)) | |
197 | return -ENOBUFS; | |
198 | ||
65f568bb TG |
199 | /* realloc to fit the new attribute */ |
200 | new_hdr = realloc(m->hdr, message_length); | |
201 | if (!new_hdr) | |
202 | return -ENOMEM; | |
203 | m->hdr = new_hdr; | |
204 | ||
205 | /* get pointer to the attribute we are about to add */ | |
7ca1d319 | 206 | rta = (struct rtattr *) ((uint8_t *) m->hdr + offset); |
65f568bb | 207 | |
5a081409 TG |
208 | /* if we are inside containers, extend them */ |
209 | for (i = 0; i < m->n_containers; i++) | |
7ca1d319 | 210 | GET_CONTAINER(m, i)->rta_len += message_length - offset; |
33125ac5 | 211 | |
65f568bb TG |
212 | /* fill in the attribute */ |
213 | rta->rta_type = type; | |
214 | rta->rta_len = rta_length; | |
7ca1d319 | 215 | if (data) |
33125ac5 TG |
216 | /* we don't deal with the case where the user lies about the type |
217 | * and gives us too little data (so don't do that) | |
7ca1d319 | 218 | */ |
33125ac5 | 219 | padding = mempcpy(RTA_DATA(rta), data, data_length); |
b8cc01a2 SS |
220 | |
221 | else | |
7ca1d319 TG |
222 | /* if no data was passed, make sure we still initialize the padding |
223 | note that we can have data_length > 0 (used by some containers) */ | |
224 | padding = RTA_DATA(rta); | |
65f568bb | 225 | |
7ca1d319 TG |
226 | /* make sure also the padding at the end of the message is initialized */ |
227 | padding_length = (uint8_t*)m->hdr + message_length - (uint8_t*)padding; | |
228 | memzero(padding, padding_length); | |
229 | ||
4ebe732c ZJS |
230 | /* update message size */ |
231 | m->hdr->nlmsg_len = message_length; | |
232 | ||
7ca1d319 | 233 | return offset; |
65f568bb TG |
234 | } |
235 | ||
6c14ad61 | 236 | static int message_attribute_has_type(sd_netlink_message *m, size_t *out_size, uint16_t attribute_type, uint16_t data_type) { |
d8e538ec TG |
237 | const NLType *type; |
238 | int r; | |
239 | ||
6c14ad61 DH |
240 | assert(m); |
241 | ||
f663aeb8 | 242 | r = type_system_get_type(m->containers[m->n_containers].type_system, &type, attribute_type); |
d8e538ec TG |
243 | if (r < 0) |
244 | return r; | |
245 | ||
817d1cd8 | 246 | if (type_get_type(type) != data_type) |
d8e538ec TG |
247 | return -EINVAL; |
248 | ||
6c14ad61 DH |
249 | if (out_size) |
250 | *out_size = type_get_size(type); | |
251 | return 0; | |
d8e538ec TG |
252 | } |
253 | ||
1c4baffc | 254 | int sd_netlink_message_append_string(sd_netlink_message *m, unsigned short type, const char *data) { |
d8e538ec | 255 | size_t length, size; |
0a0dc69b | 256 | int r; |
65f568bb TG |
257 | |
258 | assert_return(m, -EINVAL); | |
e5c4350b | 259 | assert_return(!m->sealed, -EPERM); |
65f568bb TG |
260 | assert_return(data, -EINVAL); |
261 | ||
6c14ad61 | 262 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_STRING); |
0a0dc69b TG |
263 | if (r < 0) |
264 | return r; | |
65f568bb | 265 | |
d8e538ec | 266 | if (size) { |
3072eecf LP |
267 | length = strnlen(data, size+1); |
268 | if (length > size) | |
d8e538ec TG |
269 | return -EINVAL; |
270 | } else | |
271 | length = strlen(data); | |
33125ac5 | 272 | |
d8e538ec | 273 | r = add_rtattr(m, type, data, length + 1); |
0a0dc69b TG |
274 | if (r < 0) |
275 | return r; | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
c06aead0 SS |
280 | int sd_netlink_message_append_flag(sd_netlink_message *m, unsigned short type) { |
281 | size_t size; | |
282 | int r; | |
283 | ||
284 | assert_return(m, -EINVAL); | |
285 | assert_return(!m->sealed, -EPERM); | |
286 | ||
287 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_FLAG); | |
288 | if (r < 0) | |
289 | return r; | |
290 | ||
291 | r = add_rtattr(m, type, NULL, 0); | |
292 | if (r < 0) | |
293 | return r; | |
294 | ||
295 | return 0; | |
296 | } | |
297 | ||
1c4baffc | 298 | int sd_netlink_message_append_u8(sd_netlink_message *m, unsigned short type, uint8_t data) { |
7b179640 SS |
299 | int r; |
300 | ||
301 | assert_return(m, -EINVAL); | |
302 | assert_return(!m->sealed, -EPERM); | |
303 | ||
6c14ad61 | 304 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U8); |
7b179640 SS |
305 | if (r < 0) |
306 | return r; | |
307 | ||
7b179640 SS |
308 | r = add_rtattr(m, type, &data, sizeof(uint8_t)); |
309 | if (r < 0) | |
310 | return r; | |
311 | ||
312 | return 0; | |
313 | } | |
314 | ||
315 | ||
1c4baffc | 316 | int sd_netlink_message_append_u16(sd_netlink_message *m, unsigned short type, uint16_t data) { |
01b36069 TG |
317 | int r; |
318 | ||
319 | assert_return(m, -EINVAL); | |
e5c4350b | 320 | assert_return(!m->sealed, -EPERM); |
01b36069 | 321 | |
6c14ad61 | 322 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U16); |
01b36069 TG |
323 | if (r < 0) |
324 | return r; | |
325 | ||
01b36069 TG |
326 | r = add_rtattr(m, type, &data, sizeof(uint16_t)); |
327 | if (r < 0) | |
328 | return r; | |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
1c4baffc | 333 | int sd_netlink_message_append_u32(sd_netlink_message *m, unsigned short type, uint32_t data) { |
0a0dc69b TG |
334 | int r; |
335 | ||
336 | assert_return(m, -EINVAL); | |
e5c4350b | 337 | assert_return(!m->sealed, -EPERM); |
0a0dc69b | 338 | |
6c14ad61 | 339 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U32); |
0a0dc69b TG |
340 | if (r < 0) |
341 | return r; | |
342 | ||
4d47756b | 343 | r = add_rtattr(m, type, &data, sizeof(uint32_t)); |
0a0dc69b TG |
344 | if (r < 0) |
345 | return r; | |
346 | ||
347 | return 0; | |
348 | } | |
349 | ||
17af840b SS |
350 | int sd_netlink_message_append_data(sd_netlink_message *m, unsigned short type, const void *data, size_t len) { |
351 | int r; | |
352 | ||
353 | assert_return(m, -EINVAL); | |
354 | assert_return(!m->sealed, -EPERM); | |
355 | ||
b8cc01a2 | 356 | r = add_rtattr(m, type, data, len); |
17af840b SS |
357 | if (r < 0) |
358 | return r; | |
359 | ||
360 | return 0; | |
361 | } | |
362 | ||
1c4baffc | 363 | int sd_netlink_message_append_in_addr(sd_netlink_message *m, unsigned short type, const struct in_addr *data) { |
0a0dc69b TG |
364 | int r; |
365 | ||
366 | assert_return(m, -EINVAL); | |
e5c4350b | 367 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
368 | assert_return(data, -EINVAL); |
369 | ||
6c14ad61 | 370 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
0a0dc69b TG |
371 | if (r < 0) |
372 | return r; | |
373 | ||
4d47756b | 374 | r = add_rtattr(m, type, data, sizeof(struct in_addr)); |
0a0dc69b TG |
375 | if (r < 0) |
376 | return r; | |
377 | ||
378 | return 0; | |
379 | } | |
380 | ||
1c4baffc | 381 | int sd_netlink_message_append_in6_addr(sd_netlink_message *m, unsigned short type, const struct in6_addr *data) { |
0a0dc69b TG |
382 | int r; |
383 | ||
384 | assert_return(m, -EINVAL); | |
e5c4350b | 385 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
386 | assert_return(data, -EINVAL); |
387 | ||
6c14ad61 | 388 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
0a0dc69b TG |
389 | if (r < 0) |
390 | return r; | |
391 | ||
4d47756b | 392 | r = add_rtattr(m, type, data, sizeof(struct in6_addr)); |
0a0dc69b TG |
393 | if (r < 0) |
394 | return r; | |
395 | ||
396 | return 0; | |
397 | } | |
398 | ||
1c4baffc | 399 | int sd_netlink_message_append_ether_addr(sd_netlink_message *m, unsigned short type, const struct ether_addr *data) { |
0a0dc69b TG |
400 | int r; |
401 | ||
402 | assert_return(m, -EINVAL); | |
e5c4350b | 403 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
404 | assert_return(data, -EINVAL); |
405 | ||
6c14ad61 | 406 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_ETHER_ADDR); |
d8e538ec TG |
407 | if (r < 0) |
408 | return r; | |
0a0dc69b | 409 | |
b9eaf3d1 | 410 | r = add_rtattr(m, type, data, ETH_ALEN); |
0a0dc69b TG |
411 | if (r < 0) |
412 | return r; | |
413 | ||
414 | return 0; | |
65f568bb TG |
415 | } |
416 | ||
1c4baffc | 417 | int sd_netlink_message_append_cache_info(sd_netlink_message *m, unsigned short type, const struct ifa_cacheinfo *info) { |
aba496a5 UTL |
418 | int r; |
419 | ||
420 | assert_return(m, -EINVAL); | |
421 | assert_return(!m->sealed, -EPERM); | |
422 | assert_return(info, -EINVAL); | |
423 | ||
6c14ad61 | 424 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_CACHE_INFO); |
aba496a5 UTL |
425 | if (r < 0) |
426 | return r; | |
427 | ||
428 | r = add_rtattr(m, type, info, sizeof(struct ifa_cacheinfo)); | |
429 | if (r < 0) | |
430 | return r; | |
431 | ||
432 | return 0; | |
433 | } | |
434 | ||
1c4baffc | 435 | int sd_netlink_message_open_container(sd_netlink_message *m, unsigned short type) { |
d8e538ec TG |
436 | size_t size; |
437 | int r; | |
33125ac5 | 438 | |
65f568bb | 439 | assert_return(m, -EINVAL); |
e5c4350b | 440 | assert_return(!m->sealed, -EPERM); |
7ca1d319 | 441 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -ERANGE); |
33125ac5 | 442 | |
6c14ad61 | 443 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_NESTED); |
4af7b60d TG |
444 | if (r < 0) { |
445 | const NLTypeSystemUnion *type_system_union; | |
446 | int family; | |
447 | ||
6c14ad61 | 448 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_UNION); |
4af7b60d TG |
449 | if (r < 0) |
450 | return r; | |
4af7b60d | 451 | |
89489ef7 | 452 | r = sd_rtnl_message_get_family(m, &family); |
4af7b60d TG |
453 | if (r < 0) |
454 | return r; | |
455 | ||
f663aeb8 | 456 | r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, &type_system_union, type); |
4af7b60d TG |
457 | if (r < 0) |
458 | return r; | |
459 | ||
460 | r = type_system_union_protocol_get_type_system(type_system_union, | |
f663aeb8 | 461 | &m->containers[m->n_containers + 1].type_system, |
4af7b60d TG |
462 | family); |
463 | if (r < 0) | |
464 | return r; | |
465 | } else { | |
f663aeb8 TG |
466 | r = type_system_get_type_system(m->containers[m->n_containers].type_system, |
467 | &m->containers[m->n_containers + 1].type_system, | |
4af7b60d TG |
468 | type); |
469 | if (r < 0) | |
470 | return r; | |
471 | } | |
31a4e153 | 472 | |
fcf81a54 | 473 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, size); |
d8e538ec TG |
474 | if (r < 0) |
475 | return r; | |
476 | ||
313cefa1 | 477 | m->containers[m->n_containers++].offset = r; |
7ca1d319 | 478 | |
d8e538ec TG |
479 | return 0; |
480 | } | |
481 | ||
1c4baffc | 482 | int sd_netlink_message_open_container_union(sd_netlink_message *m, unsigned short type, const char *key) { |
d8e538ec TG |
483 | const NLTypeSystemUnion *type_system_union; |
484 | int r; | |
485 | ||
486 | assert_return(m, -EINVAL); | |
487 | assert_return(!m->sealed, -EPERM); | |
488 | ||
f663aeb8 | 489 | r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, &type_system_union, type); |
d8e538ec TG |
490 | if (r < 0) |
491 | return r; | |
492 | ||
493 | r = type_system_union_get_type_system(type_system_union, | |
f663aeb8 | 494 | &m->containers[m->n_containers + 1].type_system, |
d8e538ec TG |
495 | key); |
496 | if (r < 0) | |
497 | return r; | |
33125ac5 | 498 | |
1c4baffc | 499 | r = sd_netlink_message_append_string(m, type_system_union->match, key); |
d8e538ec TG |
500 | if (r < 0) |
501 | return r; | |
502 | ||
05d0c2e3 | 503 | /* do we ever need non-null size */ |
da041d69 | 504 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, 0); |
d8e538ec TG |
505 | if (r < 0) |
506 | return r; | |
507 | ||
313cefa1 | 508 | m->containers[m->n_containers++].offset = r; |
7ca1d319 | 509 | |
d8e538ec | 510 | return 0; |
33125ac5 TG |
511 | } |
512 | ||
1c4baffc | 513 | int sd_netlink_message_close_container(sd_netlink_message *m) { |
33125ac5 | 514 | assert_return(m, -EINVAL); |
e5c4350b | 515 | assert_return(!m->sealed, -EPERM); |
5a081409 | 516 | assert_return(m->n_containers > 0, -EINVAL); |
33125ac5 | 517 | |
f663aeb8 | 518 | m->containers[m->n_containers].type_system = NULL; |
05d0c2e3 JT |
519 | m->containers[m->n_containers].offset = 0; |
520 | m->n_containers--; | |
521 | ||
522 | return 0; | |
523 | } | |
524 | ||
525 | int sd_netlink_message_open_array(sd_netlink_message *m, uint16_t type) { | |
526 | int r; | |
527 | ||
528 | assert_return(m, -EINVAL); | |
529 | assert_return(!m->sealed, -EPERM); | |
530 | assert_return(m->n_containers > 0, -EINVAL); | |
531 | ||
532 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, 0); | |
533 | if (r < 0) | |
534 | return r; | |
535 | ||
536 | m->containers[m->n_containers].offset = r; | |
537 | m->n_containers++; | |
538 | m->containers[m->n_containers].type_system = m->containers[m->n_containers - 1].type_system; | |
539 | ||
540 | return 0; | |
541 | } | |
542 | ||
543 | int sd_netlink_message_cancel_array(sd_netlink_message *m) { | |
544 | unsigned i; | |
545 | uint32_t rta_len; | |
546 | ||
547 | assert_return(m, -EINVAL); | |
548 | assert_return(!m->sealed, -EPERM); | |
549 | assert_return(m->n_containers > 1, -EINVAL); | |
550 | ||
551 | rta_len = GET_CONTAINER(m, (m->n_containers - 1))->rta_len; | |
552 | ||
553 | for (i = 0; i < m->n_containers; i++) | |
554 | GET_CONTAINER(m, i)->rta_len -= rta_len; | |
555 | ||
556 | m->hdr->nlmsg_len -= rta_len; | |
557 | ||
313cefa1 | 558 | m->n_containers--; |
05d0c2e3 | 559 | m->containers[m->n_containers].type_system = NULL; |
33125ac5 TG |
560 | |
561 | return 0; | |
562 | } | |
563 | ||
4c641e99 | 564 | static int netlink_message_read_internal(sd_netlink_message *m, unsigned short type, void **data, bool *net_byteorder) { |
f663aeb8 | 565 | struct netlink_attribute *attribute; |
f66eeb6b TG |
566 | struct rtattr *rta; |
567 | ||
44caa5e7 SS |
568 | assert_return(m, -EINVAL); |
569 | assert_return(m->sealed, -EPERM); | |
570 | assert_return(data, -EINVAL); | |
f1dd72c2 | 571 | |
0610939d | 572 | assert(m->n_containers < RTNL_CONTAINER_DEPTH); |
f663aeb8 TG |
573 | assert(m->containers[m->n_containers].attributes); |
574 | assert(type < m->containers[m->n_containers].n_attributes); | |
44caa5e7 | 575 | |
f663aeb8 TG |
576 | attribute = &m->containers[m->n_containers].attributes[type]; |
577 | ||
f1dd72c2 | 578 | if (attribute->offset == 0) |
44caa5e7 SS |
579 | return -ENODATA; |
580 | ||
f663aeb8 | 581 | rta = (struct rtattr*)((uint8_t *) m->hdr + attribute->offset); |
44caa5e7 | 582 | |
f66eeb6b TG |
583 | *data = RTA_DATA(rta); |
584 | ||
4c641e99 TG |
585 | if (net_byteorder) |
586 | *net_byteorder = attribute->net_byteorder; | |
587 | ||
f66eeb6b | 588 | return RTA_PAYLOAD(rta); |
44caa5e7 SS |
589 | } |
590 | ||
1c4baffc | 591 | int sd_netlink_message_read_string(sd_netlink_message *m, unsigned short type, const char **data) { |
44caa5e7 SS |
592 | int r; |
593 | void *attr_data; | |
594 | ||
73ae2b7d TG |
595 | assert_return(m, -EINVAL); |
596 | ||
6c14ad61 | 597 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_STRING); |
d8e538ec TG |
598 | if (r < 0) |
599 | return r; | |
44caa5e7 | 600 | |
4c641e99 | 601 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
f66eeb6b | 602 | if (r < 0) |
44caa5e7 | 603 | return r; |
f66eeb6b TG |
604 | else if (strnlen(attr_data, r) >= (size_t) r) |
605 | return -EIO; | |
44caa5e7 | 606 | |
73ae2b7d TG |
607 | if (data) |
608 | *data = (const char *) attr_data; | |
44caa5e7 SS |
609 | |
610 | return 0; | |
611 | } | |
612 | ||
1c4baffc | 613 | int sd_netlink_message_read_u8(sd_netlink_message *m, unsigned short type, uint8_t *data) { |
44caa5e7 SS |
614 | int r; |
615 | void *attr_data; | |
616 | ||
73ae2b7d TG |
617 | assert_return(m, -EINVAL); |
618 | ||
6c14ad61 | 619 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U8); |
d8e538ec TG |
620 | if (r < 0) |
621 | return r; | |
44caa5e7 | 622 | |
4c641e99 | 623 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
f66eeb6b | 624 | if (r < 0) |
44caa5e7 | 625 | return r; |
f66eeb6b TG |
626 | else if ((size_t) r < sizeof(uint8_t)) |
627 | return -EIO; | |
44caa5e7 | 628 | |
73ae2b7d TG |
629 | if (data) |
630 | *data = *(uint8_t *) attr_data; | |
44caa5e7 SS |
631 | |
632 | return 0; | |
633 | } | |
634 | ||
1c4baffc | 635 | int sd_netlink_message_read_u16(sd_netlink_message *m, unsigned short type, uint16_t *data) { |
44caa5e7 | 636 | void *attr_data; |
4c641e99 TG |
637 | bool net_byteorder; |
638 | int r; | |
44caa5e7 | 639 | |
73ae2b7d TG |
640 | assert_return(m, -EINVAL); |
641 | ||
6c14ad61 | 642 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U16); |
d8e538ec TG |
643 | if (r < 0) |
644 | return r; | |
44caa5e7 | 645 | |
4c641e99 | 646 | r = netlink_message_read_internal(m, type, &attr_data, &net_byteorder); |
f66eeb6b | 647 | if (r < 0) |
44caa5e7 | 648 | return r; |
f66eeb6b TG |
649 | else if ((size_t) r < sizeof(uint16_t)) |
650 | return -EIO; | |
44caa5e7 | 651 | |
4c641e99 TG |
652 | if (data) { |
653 | if (net_byteorder) | |
654 | *data = be16toh(*(uint16_t *) attr_data); | |
655 | else | |
656 | *data = *(uint16_t *) attr_data; | |
657 | } | |
44caa5e7 SS |
658 | |
659 | return 0; | |
660 | } | |
661 | ||
1c4baffc | 662 | int sd_netlink_message_read_u32(sd_netlink_message *m, unsigned short type, uint32_t *data) { |
44caa5e7 | 663 | void *attr_data; |
4c641e99 TG |
664 | bool net_byteorder; |
665 | int r; | |
44caa5e7 | 666 | |
73ae2b7d TG |
667 | assert_return(m, -EINVAL); |
668 | ||
6c14ad61 | 669 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U32); |
d8e538ec TG |
670 | if (r < 0) |
671 | return r; | |
44caa5e7 | 672 | |
4c641e99 | 673 | r = netlink_message_read_internal(m, type, &attr_data, &net_byteorder); |
f66eeb6b | 674 | if (r < 0) |
44caa5e7 | 675 | return r; |
f66eeb6b TG |
676 | else if ((size_t)r < sizeof(uint32_t)) |
677 | return -EIO; | |
44caa5e7 | 678 | |
4c641e99 TG |
679 | if (data) { |
680 | if (net_byteorder) | |
681 | *data = be32toh(*(uint32_t *) attr_data); | |
682 | else | |
683 | *data = *(uint32_t *) attr_data; | |
684 | } | |
44caa5e7 SS |
685 | |
686 | return 0; | |
687 | } | |
688 | ||
1c4baffc | 689 | int sd_netlink_message_read_ether_addr(sd_netlink_message *m, unsigned short type, struct ether_addr *data) { |
4e9e7f18 SS |
690 | int r; |
691 | void *attr_data; | |
692 | ||
73ae2b7d TG |
693 | assert_return(m, -EINVAL); |
694 | ||
6c14ad61 | 695 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_ETHER_ADDR); |
d8e538ec TG |
696 | if (r < 0) |
697 | return r; | |
4e9e7f18 | 698 | |
4c641e99 | 699 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
f66eeb6b | 700 | if (r < 0) |
4e9e7f18 | 701 | return r; |
f66eeb6b TG |
702 | else if ((size_t)r < sizeof(struct ether_addr)) |
703 | return -EIO; | |
4e9e7f18 | 704 | |
73ae2b7d TG |
705 | if (data) |
706 | memcpy(data, attr_data, sizeof(struct ether_addr)); | |
4e9e7f18 SS |
707 | |
708 | return 0; | |
709 | } | |
710 | ||
1c4baffc | 711 | int sd_netlink_message_read_cache_info(sd_netlink_message *m, unsigned short type, struct ifa_cacheinfo *info) { |
aba496a5 UTL |
712 | int r; |
713 | void *attr_data; | |
714 | ||
73ae2b7d TG |
715 | assert_return(m, -EINVAL); |
716 | ||
6c14ad61 | 717 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_CACHE_INFO); |
aba496a5 UTL |
718 | if (r < 0) |
719 | return r; | |
720 | ||
4c641e99 | 721 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
aba496a5 UTL |
722 | if (r < 0) |
723 | return r; | |
724 | else if ((size_t)r < sizeof(struct ifa_cacheinfo)) | |
725 | return -EIO; | |
726 | ||
73ae2b7d TG |
727 | if (info) |
728 | memcpy(info, attr_data, sizeof(struct ifa_cacheinfo)); | |
aba496a5 UTL |
729 | |
730 | return 0; | |
731 | } | |
732 | ||
1c4baffc | 733 | int sd_netlink_message_read_in_addr(sd_netlink_message *m, unsigned short type, struct in_addr *data) { |
4e9e7f18 SS |
734 | int r; |
735 | void *attr_data; | |
736 | ||
73ae2b7d TG |
737 | assert_return(m, -EINVAL); |
738 | ||
6c14ad61 | 739 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
d8e538ec TG |
740 | if (r < 0) |
741 | return r; | |
4e9e7f18 | 742 | |
4c641e99 | 743 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
f66eeb6b | 744 | if (r < 0) |
4e9e7f18 | 745 | return r; |
f66eeb6b TG |
746 | else if ((size_t)r < sizeof(struct in_addr)) |
747 | return -EIO; | |
4e9e7f18 | 748 | |
73ae2b7d TG |
749 | if (data) |
750 | memcpy(data, attr_data, sizeof(struct in_addr)); | |
4e9e7f18 SS |
751 | |
752 | return 0; | |
753 | } | |
754 | ||
1c4baffc | 755 | int sd_netlink_message_read_in6_addr(sd_netlink_message *m, unsigned short type, struct in6_addr *data) { |
4e9e7f18 SS |
756 | int r; |
757 | void *attr_data; | |
758 | ||
73ae2b7d TG |
759 | assert_return(m, -EINVAL); |
760 | ||
6c14ad61 | 761 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
d8e538ec TG |
762 | if (r < 0) |
763 | return r; | |
4e9e7f18 | 764 | |
4c641e99 | 765 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
3dd215e0 | 766 | if (r < 0) |
4e9e7f18 | 767 | return r; |
3dd215e0 TG |
768 | else if ((size_t)r < sizeof(struct in6_addr)) |
769 | return -EIO; | |
4e9e7f18 | 770 | |
73ae2b7d TG |
771 | if (data) |
772 | memcpy(data, attr_data, sizeof(struct in6_addr)); | |
4e9e7f18 SS |
773 | |
774 | return 0; | |
775 | } | |
776 | ||
f663aeb8 TG |
777 | static int netlink_container_parse(sd_netlink_message *m, |
778 | struct netlink_container *container, | |
779 | int count, | |
780 | struct rtattr *rta, | |
781 | unsigned int rt_len) { | |
782 | _cleanup_free_ struct netlink_attribute *attributes = NULL; | |
4203fc8b | 783 | |
f663aeb8 | 784 | attributes = new0(struct netlink_attribute, count); |
9ed794a3 | 785 | if (!attributes) |
4203fc8b TG |
786 | return -ENOMEM; |
787 | ||
4203fc8b | 788 | for (; RTA_OK(rta, rt_len); rta = RTA_NEXT(rta, rt_len)) { |
f663aeb8 TG |
789 | unsigned short type; |
790 | ||
4203fc8b TG |
791 | type = RTA_TYPE(rta); |
792 | ||
793 | /* if the kernel is newer than the headers we used | |
f663aeb8 | 794 | when building, we ignore out-of-range attributes */ |
4203fc8b TG |
795 | if (type >= count) |
796 | continue; | |
797 | ||
f1dd72c2 | 798 | if (attributes[type].offset != 0) |
4203fc8b TG |
799 | log_debug("rtnl: message parse - overwriting repeated attribute"); |
800 | ||
f663aeb8 | 801 | attributes[type].offset = (uint8_t *) rta - (uint8_t *) m->hdr; |
4c641e99 TG |
802 | attributes[type].nested = RTA_FLAGS(rta) & NLA_F_NESTED; |
803 | attributes[type].net_byteorder = RTA_FLAGS(rta) & NLA_F_NET_BYTEORDER; | |
4203fc8b TG |
804 | } |
805 | ||
ae2a15bc | 806 | container->attributes = TAKE_PTR(attributes); |
f663aeb8 | 807 | container->n_attributes = count; |
4203fc8b TG |
808 | |
809 | return 0; | |
810 | } | |
811 | ||
817d1cd8 | 812 | int sd_netlink_message_enter_container(sd_netlink_message *m, unsigned short type_id) { |
d8e538ec TG |
813 | const NLType *nl_type; |
814 | const NLTypeSystem *type_system; | |
3dd215e0 | 815 | void *container; |
817d1cd8 | 816 | uint16_t type; |
d8e538ec TG |
817 | size_t size; |
818 | int r; | |
3dd215e0 TG |
819 | |
820 | assert_return(m, -EINVAL); | |
821 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -EINVAL); | |
822 | ||
f663aeb8 | 823 | r = type_system_get_type(m->containers[m->n_containers].type_system, |
d8e538ec | 824 | &nl_type, |
817d1cd8 | 825 | type_id); |
3dd215e0 TG |
826 | if (r < 0) |
827 | return r; | |
3dd215e0 | 828 | |
817d1cd8 DH |
829 | type = type_get_type(nl_type); |
830 | ||
831 | if (type == NETLINK_TYPE_NESTED) { | |
f663aeb8 | 832 | r = type_system_get_type_system(m->containers[m->n_containers].type_system, |
d8e538ec | 833 | &type_system, |
817d1cd8 | 834 | type_id); |
d8e538ec TG |
835 | if (r < 0) |
836 | return r; | |
817d1cd8 | 837 | } else if (type == NETLINK_TYPE_UNION) { |
d8e538ec | 838 | const NLTypeSystemUnion *type_system_union; |
d8e538ec | 839 | |
f663aeb8 | 840 | r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, |
d8e538ec | 841 | &type_system_union, |
817d1cd8 | 842 | type_id); |
d8e538ec TG |
843 | if (r < 0) |
844 | return r; | |
845 | ||
4af7b60d TG |
846 | switch (type_system_union->match_type) { |
847 | case NL_MATCH_SIBLING: | |
848 | { | |
849 | const char *key; | |
850 | ||
1c4baffc | 851 | r = sd_netlink_message_read_string(m, type_system_union->match, &key); |
4af7b60d TG |
852 | if (r < 0) |
853 | return r; | |
854 | ||
855 | r = type_system_union_get_type_system(type_system_union, | |
856 | &type_system, | |
857 | key); | |
858 | if (r < 0) | |
859 | return r; | |
860 | ||
861 | break; | |
862 | } | |
863 | case NL_MATCH_PROTOCOL: | |
864 | { | |
865 | int family; | |
866 | ||
89489ef7 | 867 | r = sd_rtnl_message_get_family(m, &family); |
4af7b60d TG |
868 | if (r < 0) |
869 | return r; | |
870 | ||
871 | r = type_system_union_protocol_get_type_system(type_system_union, | |
872 | &type_system, | |
873 | family); | |
874 | if (r < 0) | |
875 | return r; | |
876 | ||
877 | break; | |
878 | } | |
879 | default: | |
1c4baffc | 880 | assert_not_reached("sd-netlink: invalid type system union type"); |
4af7b60d | 881 | } |
d8e538ec TG |
882 | } else |
883 | return -EINVAL; | |
884 | ||
4c641e99 | 885 | r = netlink_message_read_internal(m, type_id, &container, NULL); |
3dd215e0 TG |
886 | if (r < 0) |
887 | return r; | |
d8e538ec TG |
888 | else |
889 | size = (size_t)r; | |
3dd215e0 | 890 | |
313cefa1 | 891 | m->n_containers++; |
3dd215e0 | 892 | |
f663aeb8 TG |
893 | r = netlink_container_parse(m, |
894 | &m->containers[m->n_containers], | |
895 | type_system_get_count(type_system), | |
896 | container, | |
897 | size); | |
d8e538ec | 898 | if (r < 0) { |
313cefa1 | 899 | m->n_containers--; |
3dd215e0 | 900 | return r; |
d8e538ec | 901 | } |
3dd215e0 | 902 | |
f663aeb8 | 903 | m->containers[m->n_containers].type_system = type_system; |
3dd215e0 TG |
904 | |
905 | return 0; | |
906 | } | |
907 | ||
1c4baffc | 908 | int sd_netlink_message_exit_container(sd_netlink_message *m) { |
e5c4350b TG |
909 | assert_return(m, -EINVAL); |
910 | assert_return(m->sealed, -EINVAL); | |
911 | assert_return(m->n_containers > 0, -EINVAL); | |
912 | ||
a1e58e8e | 913 | m->containers[m->n_containers].attributes = mfree(m->containers[m->n_containers].attributes); |
f663aeb8 | 914 | m->containers[m->n_containers].type_system = NULL; |
3dd215e0 | 915 | |
313cefa1 | 916 | m->n_containers--; |
e5c4350b TG |
917 | |
918 | return 0; | |
919 | } | |
920 | ||
1c4baffc | 921 | uint32_t rtnl_message_get_serial(sd_netlink_message *m) { |
65f568bb | 922 | assert(m); |
9d0db178 | 923 | assert(m->hdr); |
65f568bb TG |
924 | |
925 | return m->hdr->nlmsg_seq; | |
926 | } | |
927 | ||
1c4baffc | 928 | int sd_netlink_message_is_error(sd_netlink_message *m) { |
45af44d4 TG |
929 | assert_return(m, 0); |
930 | assert_return(m->hdr, 0); | |
931 | ||
932 | return m->hdr->nlmsg_type == NLMSG_ERROR; | |
933 | } | |
934 | ||
1c4baffc | 935 | int sd_netlink_message_get_errno(sd_netlink_message *m) { |
65f568bb TG |
936 | struct nlmsgerr *err; |
937 | ||
e16bcf98 | 938 | assert_return(m, -EINVAL); |
9d0db178 | 939 | assert_return(m->hdr, -EINVAL); |
65f568bb | 940 | |
1c4baffc | 941 | if (!sd_netlink_message_is_error(m)) |
65f568bb TG |
942 | return 0; |
943 | ||
944 | err = NLMSG_DATA(m->hdr); | |
945 | ||
946 | return err->error; | |
947 | } | |
948 | ||
1c4baffc | 949 | int sd_netlink_message_rewind(sd_netlink_message *m) { |
817d1cd8 | 950 | const NLType *nl_type; |
05d0c2e3 | 951 | const NLTypeSystem *type_system_root; |
817d1cd8 DH |
952 | uint16_t type; |
953 | size_t size; | |
3dd215e0 TG |
954 | unsigned i; |
955 | int r; | |
0fc7531b TG |
956 | |
957 | assert_return(m, -EINVAL); | |
0fc7531b | 958 | |
3dd215e0 TG |
959 | /* don't allow appending to message once parsed */ |
960 | if (!m->sealed) | |
961 | rtnl_message_seal(m); | |
962 | ||
05d0c2e3 JT |
963 | type_system_root = type_system_get_root(m->protocol); |
964 | ||
1f6b4113 | 965 | for (i = 1; i <= m->n_containers; i++) |
a1e58e8e | 966 | m->containers[i].attributes = mfree(m->containers[i].attributes); |
3dd215e0 TG |
967 | |
968 | m->n_containers = 0; | |
969 | ||
ece174c5 | 970 | if (m->containers[0].attributes) |
3dd215e0 TG |
971 | /* top-level attributes have already been parsed */ |
972 | return 0; | |
3dd215e0 | 973 | |
d8e538ec TG |
974 | assert(m->hdr); |
975 | ||
05d0c2e3 | 976 | r = type_system_get_type(type_system_root, &nl_type, m->hdr->nlmsg_type); |
d8e538ec TG |
977 | if (r < 0) |
978 | return r; | |
979 | ||
817d1cd8 DH |
980 | type = type_get_type(nl_type); |
981 | size = type_get_size(nl_type); | |
982 | ||
983 | if (type == NETLINK_TYPE_NESTED) { | |
c658008f | 984 | const NLTypeSystem *type_system; |
d8e538ec | 985 | |
817d1cd8 | 986 | type_get_type_system(nl_type, &type_system); |
d8e538ec | 987 | |
f663aeb8 | 988 | m->containers[0].type_system = type_system; |
d8e538ec | 989 | |
f663aeb8 TG |
990 | r = netlink_container_parse(m, |
991 | &m->containers[m->n_containers], | |
992 | type_system_get_count(type_system), | |
993 | (struct rtattr*)((uint8_t*)NLMSG_DATA(m->hdr) + NLMSG_ALIGN(size)), | |
994 | NLMSG_PAYLOAD(m->hdr, size)); | |
d8e538ec TG |
995 | if (r < 0) |
996 | return r; | |
0fc7531b TG |
997 | } |
998 | ||
999 | return 0; | |
1000 | } | |
3dd215e0 | 1001 | |
1c4baffc | 1002 | void rtnl_message_seal(sd_netlink_message *m) { |
3dd215e0 TG |
1003 | assert(m); |
1004 | assert(!m->sealed); | |
1005 | ||
1006 | m->sealed = true; | |
1007 | } | |
1403f45a | 1008 | |
1c4baffc | 1009 | sd_netlink_message *sd_netlink_message_next(sd_netlink_message *m) { |
1403f45a TG |
1010 | assert_return(m, NULL); |
1011 | ||
1012 | return m->next; | |
1013 | } |