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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 | ||
07630cea LP |
26 | #include "sd-netlink.h" |
27 | ||
b5efdb8a | 28 | #include "alloc-util.h" |
6482f626 | 29 | #include "formats-util.h" |
d5eff740 | 30 | #include "missing.h" |
1c4baffc TG |
31 | #include "netlink-internal.h" |
32 | #include "netlink-types.h" | |
07630cea LP |
33 | #include "netlink-util.h" |
34 | #include "refcnt.h" | |
35 | #include "socket-util.h" | |
36 | #include "util.h" | |
65f568bb | 37 | |
f663aeb8 | 38 | #define GET_CONTAINER(m, i) ((i) < (m)->n_containers ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->containers[i].offset) : NULL) |
e5c4350b | 39 | #define PUSH_CONTAINER(m, new) (m)->container_offsets[(m)->n_containers ++] = (uint8_t*)(new) - (uint8_t*)(m)->hdr; |
4ebe732c | 40 | |
0a2478a9 | 41 | #define RTA_TYPE(rta) ((rta)->rta_type & NLA_TYPE_MASK) |
4c641e99 | 42 | #define RTA_FLAGS(rta) ((rta)->rta_type & ~NLA_TYPE_MASK) |
0a2478a9 | 43 | |
89489ef7 | 44 | int message_new_empty(sd_netlink *rtnl, sd_netlink_message **ret) { |
1c4baffc | 45 | sd_netlink_message *m; |
65f568bb TG |
46 | |
47 | assert_return(ret, -EINVAL); | |
65f568bb | 48 | |
f131770b | 49 | /* Note that 'rtnl' is currently unused, if we start using it internally |
8c578303 | 50 | we must take care to avoid problems due to mutual references between |
ff9b60f3 | 51 | buses and their queued messages. See sd-bus. |
8c578303 TG |
52 | */ |
53 | ||
1c4baffc | 54 | m = new0(sd_netlink_message, 1); |
65f568bb TG |
55 | if (!m) |
56 | return -ENOMEM; | |
57 | ||
65f568bb TG |
58 | m->n_ref = REFCNT_INIT; |
59 | ||
65f568bb TG |
60 | m->sealed = false; |
61 | ||
62 | *ret = m; | |
63 | ||
64 | return 0; | |
65 | } | |
66 | ||
1c4baffc | 67 | int message_new(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t type) { |
4afd3348 | 68 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
d8e538ec TG |
69 | const NLType *nl_type; |
70 | size_t size; | |
71 | int r; | |
72 | ||
846a6b3d | 73 | r = type_system_get_type(&type_system_root, &nl_type, type); |
d8e538ec TG |
74 | if (r < 0) |
75 | return r; | |
76 | ||
12b7dff4 DH |
77 | if (type_get_type(nl_type) != NETLINK_TYPE_NESTED) |
78 | return -EINVAL; | |
79 | ||
1b89cf56 | 80 | r = message_new_empty(rtnl, &m); |
d8e538ec TG |
81 | if (r < 0) |
82 | return r; | |
83 | ||
817d1cd8 | 84 | size = NLMSG_SPACE(type_get_size(nl_type)); |
1b89cf56 TG |
85 | |
86 | assert(size >= sizeof(struct nlmsghdr)); | |
87 | m->hdr = malloc0(size); | |
88 | if (!m->hdr) | |
89 | return -ENOMEM; | |
90 | ||
91 | m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; | |
92 | ||
f663aeb8 | 93 | type_get_type_system(nl_type, &m->containers[0].type_system); |
1b89cf56 TG |
94 | m->hdr->nlmsg_len = size; |
95 | m->hdr->nlmsg_type = type; | |
96 | ||
97 | *ret = m; | |
98 | m = NULL; | |
d8e538ec TG |
99 | |
100 | return 0; | |
101 | } | |
102 | ||
1c4baffc | 103 | int sd_netlink_message_request_dump(sd_netlink_message *m, int dump) { |
6e20c8f8 TG |
104 | assert_return(m, -EINVAL); |
105 | assert_return(m->hdr, -EINVAL); | |
20dff6c4 TG |
106 | assert_return(m->hdr->nlmsg_type == RTM_GETLINK || |
107 | m->hdr->nlmsg_type == RTM_GETADDR || | |
108 | m->hdr->nlmsg_type == RTM_GETROUTE || | |
109 | m->hdr->nlmsg_type == RTM_GETNEIGH, | |
6e20c8f8 TG |
110 | -EINVAL); |
111 | ||
112 | if (dump) | |
113 | m->hdr->nlmsg_flags |= NLM_F_DUMP; | |
114 | else | |
115 | m->hdr->nlmsg_flags &= ~NLM_F_DUMP; | |
116 | ||
117 | return 0; | |
118 | } | |
119 | ||
1c4baffc | 120 | sd_netlink_message *sd_netlink_message_ref(sd_netlink_message *m) { |
65f568bb TG |
121 | if (m) |
122 | assert_se(REFCNT_INC(m->n_ref) >= 2); | |
123 | ||
124 | return m; | |
125 | } | |
126 | ||
1c4baffc | 127 | sd_netlink_message *sd_netlink_message_unref(sd_netlink_message *m) { |
f0c4b1c3 | 128 | if (m && REFCNT_DEC(m->n_ref) == 0) { |
3dd215e0 TG |
129 | unsigned i; |
130 | ||
65f568bb | 131 | free(m->hdr); |
3dd215e0 | 132 | |
9f5bbfe3 | 133 | for (i = 0; i <= m->n_containers; i++) |
f663aeb8 | 134 | free(m->containers[i].attributes); |
3dd215e0 | 135 | |
1c4baffc | 136 | sd_netlink_message_unref(m->next); |
1403f45a | 137 | |
65f568bb TG |
138 | free(m); |
139 | } | |
140 | ||
141 | return NULL; | |
142 | } | |
143 | ||
1c4baffc | 144 | int sd_netlink_message_get_type(sd_netlink_message *m, uint16_t *type) { |
65f568bb TG |
145 | assert_return(m, -EINVAL); |
146 | assert_return(type, -EINVAL); | |
147 | ||
148 | *type = m->hdr->nlmsg_type; | |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
c06cb593 SS |
153 | int sd_netlink_message_set_flags(sd_netlink_message *m, uint16_t flags) { |
154 | assert_return(m, -EINVAL); | |
155 | assert_return(flags, -EINVAL); | |
156 | ||
157 | m->hdr->nlmsg_flags = flags; | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
1c4baffc | 162 | int sd_netlink_message_is_broadcast(sd_netlink_message *m) { |
1f0db3ed TG |
163 | assert_return(m, -EINVAL); |
164 | ||
3f42446d | 165 | return m->broadcast; |
1f0db3ed TG |
166 | } |
167 | ||
4ebe732c ZJS |
168 | /* If successful the updated message will be correctly aligned, if |
169 | unsuccessful the old message is untouched. */ | |
1c4baffc | 170 | static int add_rtattr(sd_netlink_message *m, unsigned short type, const void *data, size_t data_length) { |
7ca1d319 TG |
171 | uint32_t rta_length; |
172 | size_t message_length, padding_length; | |
65f568bb TG |
173 | struct nlmsghdr *new_hdr; |
174 | struct rtattr *rta; | |
8e337e64 | 175 | char *padding; |
5a081409 | 176 | unsigned i; |
7ca1d319 | 177 | int offset; |
65f568bb | 178 | |
33125ac5 TG |
179 | assert(m); |
180 | assert(m->hdr); | |
e5c4350b | 181 | assert(!m->sealed); |
33125ac5 | 182 | assert(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len); |
7ca1d319 TG |
183 | assert(!data || data_length); |
184 | ||
185 | /* get offset of the new attribute */ | |
186 | offset = m->hdr->nlmsg_len; | |
65f568bb | 187 | |
8e337e64 | 188 | /* get the size of the new rta attribute (with padding at the end) */ |
65f568bb | 189 | rta_length = RTA_LENGTH(data_length); |
4ebe732c ZJS |
190 | |
191 | /* get the new message size (with padding at the end) */ | |
7ca1d319 | 192 | message_length = offset + RTA_ALIGN(rta_length); |
65f568bb TG |
193 | |
194 | /* realloc to fit the new attribute */ | |
195 | new_hdr = realloc(m->hdr, message_length); | |
196 | if (!new_hdr) | |
197 | return -ENOMEM; | |
198 | m->hdr = new_hdr; | |
199 | ||
200 | /* get pointer to the attribute we are about to add */ | |
7ca1d319 | 201 | rta = (struct rtattr *) ((uint8_t *) m->hdr + offset); |
65f568bb | 202 | |
5a081409 TG |
203 | /* if we are inside containers, extend them */ |
204 | for (i = 0; i < m->n_containers; i++) | |
7ca1d319 | 205 | GET_CONTAINER(m, i)->rta_len += message_length - offset; |
33125ac5 | 206 | |
65f568bb TG |
207 | /* fill in the attribute */ |
208 | rta->rta_type = type; | |
209 | rta->rta_len = rta_length; | |
7ca1d319 | 210 | if (data) |
33125ac5 TG |
211 | /* we don't deal with the case where the user lies about the type |
212 | * and gives us too little data (so don't do that) | |
7ca1d319 | 213 | */ |
33125ac5 | 214 | padding = mempcpy(RTA_DATA(rta), data, data_length); |
7ca1d319 TG |
215 | else { |
216 | /* if no data was passed, make sure we still initialize the padding | |
217 | note that we can have data_length > 0 (used by some containers) */ | |
218 | padding = RTA_DATA(rta); | |
33125ac5 | 219 | } |
65f568bb | 220 | |
7ca1d319 TG |
221 | /* make sure also the padding at the end of the message is initialized */ |
222 | padding_length = (uint8_t*)m->hdr + message_length - (uint8_t*)padding; | |
223 | memzero(padding, padding_length); | |
224 | ||
4ebe732c ZJS |
225 | /* update message size */ |
226 | m->hdr->nlmsg_len = message_length; | |
227 | ||
7ca1d319 | 228 | return offset; |
65f568bb TG |
229 | } |
230 | ||
6c14ad61 | 231 | static int message_attribute_has_type(sd_netlink_message *m, size_t *out_size, uint16_t attribute_type, uint16_t data_type) { |
d8e538ec TG |
232 | const NLType *type; |
233 | int r; | |
234 | ||
6c14ad61 DH |
235 | assert(m); |
236 | ||
f663aeb8 | 237 | r = type_system_get_type(m->containers[m->n_containers].type_system, &type, attribute_type); |
d8e538ec TG |
238 | if (r < 0) |
239 | return r; | |
240 | ||
817d1cd8 | 241 | if (type_get_type(type) != data_type) |
d8e538ec TG |
242 | return -EINVAL; |
243 | ||
6c14ad61 DH |
244 | if (out_size) |
245 | *out_size = type_get_size(type); | |
246 | return 0; | |
d8e538ec TG |
247 | } |
248 | ||
1c4baffc | 249 | int sd_netlink_message_append_string(sd_netlink_message *m, unsigned short type, const char *data) { |
d8e538ec | 250 | size_t length, size; |
0a0dc69b | 251 | int r; |
65f568bb TG |
252 | |
253 | assert_return(m, -EINVAL); | |
e5c4350b | 254 | assert_return(!m->sealed, -EPERM); |
65f568bb TG |
255 | assert_return(data, -EINVAL); |
256 | ||
6c14ad61 | 257 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_STRING); |
0a0dc69b TG |
258 | if (r < 0) |
259 | return r; | |
65f568bb | 260 | |
d8e538ec | 261 | if (size) { |
3072eecf LP |
262 | length = strnlen(data, size+1); |
263 | if (length > size) | |
d8e538ec TG |
264 | return -EINVAL; |
265 | } else | |
266 | length = strlen(data); | |
33125ac5 | 267 | |
d8e538ec | 268 | r = add_rtattr(m, type, data, length + 1); |
0a0dc69b TG |
269 | if (r < 0) |
270 | return r; | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
c06aead0 SS |
275 | int sd_netlink_message_append_flag(sd_netlink_message *m, unsigned short type) { |
276 | size_t size; | |
277 | int r; | |
278 | ||
279 | assert_return(m, -EINVAL); | |
280 | assert_return(!m->sealed, -EPERM); | |
281 | ||
282 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_FLAG); | |
283 | if (r < 0) | |
284 | return r; | |
285 | ||
286 | r = add_rtattr(m, type, NULL, 0); | |
287 | if (r < 0) | |
288 | return r; | |
289 | ||
290 | return 0; | |
291 | } | |
292 | ||
1c4baffc | 293 | int sd_netlink_message_append_u8(sd_netlink_message *m, unsigned short type, uint8_t data) { |
7b179640 SS |
294 | int r; |
295 | ||
296 | assert_return(m, -EINVAL); | |
297 | assert_return(!m->sealed, -EPERM); | |
298 | ||
6c14ad61 | 299 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U8); |
7b179640 SS |
300 | if (r < 0) |
301 | return r; | |
302 | ||
7b179640 SS |
303 | r = add_rtattr(m, type, &data, sizeof(uint8_t)); |
304 | if (r < 0) | |
305 | return r; | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
310 | ||
1c4baffc | 311 | int sd_netlink_message_append_u16(sd_netlink_message *m, unsigned short type, uint16_t data) { |
01b36069 TG |
312 | int r; |
313 | ||
314 | assert_return(m, -EINVAL); | |
e5c4350b | 315 | assert_return(!m->sealed, -EPERM); |
01b36069 | 316 | |
6c14ad61 | 317 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U16); |
01b36069 TG |
318 | if (r < 0) |
319 | return r; | |
320 | ||
01b36069 TG |
321 | r = add_rtattr(m, type, &data, sizeof(uint16_t)); |
322 | if (r < 0) | |
323 | return r; | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
1c4baffc | 328 | int sd_netlink_message_append_u32(sd_netlink_message *m, unsigned short type, uint32_t data) { |
0a0dc69b TG |
329 | int r; |
330 | ||
331 | assert_return(m, -EINVAL); | |
e5c4350b | 332 | assert_return(!m->sealed, -EPERM); |
0a0dc69b | 333 | |
6c14ad61 | 334 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U32); |
0a0dc69b TG |
335 | if (r < 0) |
336 | return r; | |
337 | ||
4d47756b | 338 | r = add_rtattr(m, type, &data, sizeof(uint32_t)); |
0a0dc69b TG |
339 | if (r < 0) |
340 | return r; | |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
1c4baffc | 345 | int sd_netlink_message_append_in_addr(sd_netlink_message *m, unsigned short type, const struct in_addr *data) { |
0a0dc69b TG |
346 | int r; |
347 | ||
348 | assert_return(m, -EINVAL); | |
e5c4350b | 349 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
350 | assert_return(data, -EINVAL); |
351 | ||
6c14ad61 | 352 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
0a0dc69b TG |
353 | if (r < 0) |
354 | return r; | |
355 | ||
4d47756b | 356 | r = add_rtattr(m, type, data, sizeof(struct in_addr)); |
0a0dc69b TG |
357 | if (r < 0) |
358 | return r; | |
359 | ||
360 | return 0; | |
361 | } | |
362 | ||
1c4baffc | 363 | int sd_netlink_message_append_in6_addr(sd_netlink_message *m, unsigned short type, const struct in6_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 in6_addr)); |
0a0dc69b TG |
375 | if (r < 0) |
376 | return r; | |
377 | ||
378 | return 0; | |
379 | } | |
380 | ||
1c4baffc | 381 | int sd_netlink_message_append_ether_addr(sd_netlink_message *m, unsigned short type, const struct ether_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_ETHER_ADDR); |
d8e538ec TG |
389 | if (r < 0) |
390 | return r; | |
0a0dc69b | 391 | |
b9eaf3d1 | 392 | r = add_rtattr(m, type, data, ETH_ALEN); |
0a0dc69b TG |
393 | if (r < 0) |
394 | return r; | |
395 | ||
396 | return 0; | |
65f568bb TG |
397 | } |
398 | ||
1c4baffc | 399 | int sd_netlink_message_append_cache_info(sd_netlink_message *m, unsigned short type, const struct ifa_cacheinfo *info) { |
aba496a5 UTL |
400 | int r; |
401 | ||
402 | assert_return(m, -EINVAL); | |
403 | assert_return(!m->sealed, -EPERM); | |
404 | assert_return(info, -EINVAL); | |
405 | ||
6c14ad61 | 406 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_CACHE_INFO); |
aba496a5 UTL |
407 | if (r < 0) |
408 | return r; | |
409 | ||
410 | r = add_rtattr(m, type, info, sizeof(struct ifa_cacheinfo)); | |
411 | if (r < 0) | |
412 | return r; | |
413 | ||
414 | return 0; | |
415 | } | |
416 | ||
1c4baffc | 417 | int sd_netlink_message_open_container(sd_netlink_message *m, unsigned short type) { |
d8e538ec TG |
418 | size_t size; |
419 | int r; | |
33125ac5 | 420 | |
65f568bb | 421 | assert_return(m, -EINVAL); |
e5c4350b | 422 | assert_return(!m->sealed, -EPERM); |
7ca1d319 | 423 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -ERANGE); |
33125ac5 | 424 | |
6c14ad61 | 425 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_NESTED); |
4af7b60d TG |
426 | if (r < 0) { |
427 | const NLTypeSystemUnion *type_system_union; | |
428 | int family; | |
429 | ||
6c14ad61 | 430 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_UNION); |
4af7b60d TG |
431 | if (r < 0) |
432 | return r; | |
4af7b60d | 433 | |
89489ef7 | 434 | r = sd_rtnl_message_get_family(m, &family); |
4af7b60d TG |
435 | if (r < 0) |
436 | return r; | |
437 | ||
f663aeb8 | 438 | r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, &type_system_union, type); |
4af7b60d TG |
439 | if (r < 0) |
440 | return r; | |
441 | ||
442 | r = type_system_union_protocol_get_type_system(type_system_union, | |
f663aeb8 | 443 | &m->containers[m->n_containers + 1].type_system, |
4af7b60d TG |
444 | family); |
445 | if (r < 0) | |
446 | return r; | |
447 | } else { | |
f663aeb8 TG |
448 | r = type_system_get_type_system(m->containers[m->n_containers].type_system, |
449 | &m->containers[m->n_containers + 1].type_system, | |
4af7b60d TG |
450 | type); |
451 | if (r < 0) | |
452 | return r; | |
453 | } | |
31a4e153 | 454 | |
fcf81a54 | 455 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, size); |
d8e538ec TG |
456 | if (r < 0) |
457 | return r; | |
458 | ||
f663aeb8 | 459 | m->containers[m->n_containers ++].offset = r; |
7ca1d319 | 460 | |
d8e538ec TG |
461 | return 0; |
462 | } | |
463 | ||
1c4baffc | 464 | int sd_netlink_message_open_container_union(sd_netlink_message *m, unsigned short type, const char *key) { |
d8e538ec TG |
465 | const NLTypeSystemUnion *type_system_union; |
466 | int r; | |
467 | ||
468 | assert_return(m, -EINVAL); | |
469 | assert_return(!m->sealed, -EPERM); | |
470 | ||
f663aeb8 | 471 | r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, &type_system_union, type); |
d8e538ec TG |
472 | if (r < 0) |
473 | return r; | |
474 | ||
475 | r = type_system_union_get_type_system(type_system_union, | |
f663aeb8 | 476 | &m->containers[m->n_containers + 1].type_system, |
d8e538ec TG |
477 | key); |
478 | if (r < 0) | |
479 | return r; | |
33125ac5 | 480 | |
1c4baffc | 481 | r = sd_netlink_message_append_string(m, type_system_union->match, key); |
d8e538ec TG |
482 | if (r < 0) |
483 | return r; | |
484 | ||
485 | /* do we evere need non-null size */ | |
da041d69 | 486 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, 0); |
d8e538ec TG |
487 | if (r < 0) |
488 | return r; | |
489 | ||
f663aeb8 | 490 | m->containers[m->n_containers ++].offset = r; |
7ca1d319 | 491 | |
d8e538ec | 492 | return 0; |
33125ac5 TG |
493 | } |
494 | ||
d8e538ec | 495 | |
1c4baffc | 496 | int sd_netlink_message_close_container(sd_netlink_message *m) { |
33125ac5 | 497 | assert_return(m, -EINVAL); |
e5c4350b | 498 | assert_return(!m->sealed, -EPERM); |
5a081409 | 499 | assert_return(m->n_containers > 0, -EINVAL); |
33125ac5 | 500 | |
f663aeb8 | 501 | m->containers[m->n_containers].type_system = NULL; |
5a081409 | 502 | m->n_containers --; |
33125ac5 TG |
503 | |
504 | return 0; | |
505 | } | |
506 | ||
4c641e99 | 507 | static int netlink_message_read_internal(sd_netlink_message *m, unsigned short type, void **data, bool *net_byteorder) { |
f663aeb8 | 508 | struct netlink_attribute *attribute; |
f66eeb6b TG |
509 | struct rtattr *rta; |
510 | ||
44caa5e7 SS |
511 | assert_return(m, -EINVAL); |
512 | assert_return(m->sealed, -EPERM); | |
513 | assert_return(data, -EINVAL); | |
0610939d | 514 | assert(m->n_containers < RTNL_CONTAINER_DEPTH); |
f663aeb8 TG |
515 | assert(m->containers[m->n_containers].attributes); |
516 | assert(type < m->containers[m->n_containers].n_attributes); | |
44caa5e7 | 517 | |
f663aeb8 TG |
518 | attribute = &m->containers[m->n_containers].attributes[type]; |
519 | ||
520 | if(!attribute->offset) | |
44caa5e7 SS |
521 | return -ENODATA; |
522 | ||
f663aeb8 | 523 | rta = (struct rtattr*)((uint8_t *) m->hdr + attribute->offset); |
44caa5e7 | 524 | |
f66eeb6b TG |
525 | *data = RTA_DATA(rta); |
526 | ||
4c641e99 TG |
527 | if (net_byteorder) |
528 | *net_byteorder = attribute->net_byteorder; | |
529 | ||
f66eeb6b | 530 | return RTA_PAYLOAD(rta); |
44caa5e7 SS |
531 | } |
532 | ||
1c4baffc | 533 | int sd_netlink_message_read_string(sd_netlink_message *m, unsigned short type, const char **data) { |
44caa5e7 SS |
534 | int r; |
535 | void *attr_data; | |
536 | ||
73ae2b7d TG |
537 | assert_return(m, -EINVAL); |
538 | ||
6c14ad61 | 539 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_STRING); |
d8e538ec TG |
540 | if (r < 0) |
541 | return r; | |
44caa5e7 | 542 | |
4c641e99 | 543 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
f66eeb6b | 544 | if (r < 0) |
44caa5e7 | 545 | return r; |
f66eeb6b TG |
546 | else if (strnlen(attr_data, r) >= (size_t) r) |
547 | return -EIO; | |
44caa5e7 | 548 | |
73ae2b7d TG |
549 | if (data) |
550 | *data = (const char *) attr_data; | |
44caa5e7 SS |
551 | |
552 | return 0; | |
553 | } | |
554 | ||
1c4baffc | 555 | int sd_netlink_message_read_u8(sd_netlink_message *m, unsigned short type, uint8_t *data) { |
44caa5e7 SS |
556 | int r; |
557 | void *attr_data; | |
558 | ||
73ae2b7d TG |
559 | assert_return(m, -EINVAL); |
560 | ||
6c14ad61 | 561 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U8); |
d8e538ec TG |
562 | if (r < 0) |
563 | return r; | |
44caa5e7 | 564 | |
4c641e99 | 565 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
f66eeb6b | 566 | if (r < 0) |
44caa5e7 | 567 | return r; |
f66eeb6b TG |
568 | else if ((size_t) r < sizeof(uint8_t)) |
569 | return -EIO; | |
44caa5e7 | 570 | |
73ae2b7d TG |
571 | if (data) |
572 | *data = *(uint8_t *) attr_data; | |
44caa5e7 SS |
573 | |
574 | return 0; | |
575 | } | |
576 | ||
1c4baffc | 577 | int sd_netlink_message_read_u16(sd_netlink_message *m, unsigned short type, uint16_t *data) { |
44caa5e7 | 578 | void *attr_data; |
4c641e99 TG |
579 | bool net_byteorder; |
580 | int r; | |
44caa5e7 | 581 | |
73ae2b7d TG |
582 | assert_return(m, -EINVAL); |
583 | ||
6c14ad61 | 584 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U16); |
d8e538ec TG |
585 | if (r < 0) |
586 | return r; | |
44caa5e7 | 587 | |
4c641e99 | 588 | r = netlink_message_read_internal(m, type, &attr_data, &net_byteorder); |
f66eeb6b | 589 | if (r < 0) |
44caa5e7 | 590 | return r; |
f66eeb6b TG |
591 | else if ((size_t) r < sizeof(uint16_t)) |
592 | return -EIO; | |
44caa5e7 | 593 | |
4c641e99 TG |
594 | if (data) { |
595 | if (net_byteorder) | |
596 | *data = be16toh(*(uint16_t *) attr_data); | |
597 | else | |
598 | *data = *(uint16_t *) attr_data; | |
599 | } | |
44caa5e7 SS |
600 | |
601 | return 0; | |
602 | } | |
603 | ||
1c4baffc | 604 | int sd_netlink_message_read_u32(sd_netlink_message *m, unsigned short type, uint32_t *data) { |
44caa5e7 | 605 | void *attr_data; |
4c641e99 TG |
606 | bool net_byteorder; |
607 | int r; | |
44caa5e7 | 608 | |
73ae2b7d TG |
609 | assert_return(m, -EINVAL); |
610 | ||
6c14ad61 | 611 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U32); |
d8e538ec TG |
612 | if (r < 0) |
613 | return r; | |
44caa5e7 | 614 | |
4c641e99 | 615 | r = netlink_message_read_internal(m, type, &attr_data, &net_byteorder); |
f66eeb6b | 616 | if (r < 0) |
44caa5e7 | 617 | return r; |
f66eeb6b TG |
618 | else if ((size_t)r < sizeof(uint32_t)) |
619 | return -EIO; | |
44caa5e7 | 620 | |
4c641e99 TG |
621 | if (data) { |
622 | if (net_byteorder) | |
623 | *data = be32toh(*(uint32_t *) attr_data); | |
624 | else | |
625 | *data = *(uint32_t *) attr_data; | |
626 | } | |
44caa5e7 SS |
627 | |
628 | return 0; | |
629 | } | |
630 | ||
1c4baffc | 631 | int sd_netlink_message_read_ether_addr(sd_netlink_message *m, unsigned short type, struct ether_addr *data) { |
4e9e7f18 SS |
632 | int r; |
633 | void *attr_data; | |
634 | ||
73ae2b7d TG |
635 | assert_return(m, -EINVAL); |
636 | ||
6c14ad61 | 637 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_ETHER_ADDR); |
d8e538ec TG |
638 | if (r < 0) |
639 | return r; | |
4e9e7f18 | 640 | |
4c641e99 | 641 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
f66eeb6b | 642 | if (r < 0) |
4e9e7f18 | 643 | return r; |
f66eeb6b TG |
644 | else if ((size_t)r < sizeof(struct ether_addr)) |
645 | return -EIO; | |
4e9e7f18 | 646 | |
73ae2b7d TG |
647 | if (data) |
648 | memcpy(data, attr_data, sizeof(struct ether_addr)); | |
4e9e7f18 SS |
649 | |
650 | return 0; | |
651 | } | |
652 | ||
1c4baffc | 653 | int sd_netlink_message_read_cache_info(sd_netlink_message *m, unsigned short type, struct ifa_cacheinfo *info) { |
aba496a5 UTL |
654 | int r; |
655 | void *attr_data; | |
656 | ||
73ae2b7d TG |
657 | assert_return(m, -EINVAL); |
658 | ||
6c14ad61 | 659 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_CACHE_INFO); |
aba496a5 UTL |
660 | if (r < 0) |
661 | return r; | |
662 | ||
4c641e99 | 663 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
aba496a5 UTL |
664 | if (r < 0) |
665 | return r; | |
666 | else if ((size_t)r < sizeof(struct ifa_cacheinfo)) | |
667 | return -EIO; | |
668 | ||
73ae2b7d TG |
669 | if (info) |
670 | memcpy(info, attr_data, sizeof(struct ifa_cacheinfo)); | |
aba496a5 UTL |
671 | |
672 | return 0; | |
673 | } | |
674 | ||
1c4baffc | 675 | int sd_netlink_message_read_in_addr(sd_netlink_message *m, unsigned short type, struct in_addr *data) { |
4e9e7f18 SS |
676 | int r; |
677 | void *attr_data; | |
678 | ||
73ae2b7d TG |
679 | assert_return(m, -EINVAL); |
680 | ||
6c14ad61 | 681 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
d8e538ec TG |
682 | if (r < 0) |
683 | return r; | |
4e9e7f18 | 684 | |
4c641e99 | 685 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
f66eeb6b | 686 | if (r < 0) |
4e9e7f18 | 687 | return r; |
f66eeb6b TG |
688 | else if ((size_t)r < sizeof(struct in_addr)) |
689 | return -EIO; | |
4e9e7f18 | 690 | |
73ae2b7d TG |
691 | if (data) |
692 | memcpy(data, attr_data, sizeof(struct in_addr)); | |
4e9e7f18 SS |
693 | |
694 | return 0; | |
695 | } | |
696 | ||
1c4baffc | 697 | int sd_netlink_message_read_in6_addr(sd_netlink_message *m, unsigned short type, struct in6_addr *data) { |
4e9e7f18 SS |
698 | int r; |
699 | void *attr_data; | |
700 | ||
73ae2b7d TG |
701 | assert_return(m, -EINVAL); |
702 | ||
6c14ad61 | 703 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
d8e538ec TG |
704 | if (r < 0) |
705 | return r; | |
4e9e7f18 | 706 | |
4c641e99 | 707 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
3dd215e0 | 708 | if (r < 0) |
4e9e7f18 | 709 | return r; |
3dd215e0 TG |
710 | else if ((size_t)r < sizeof(struct in6_addr)) |
711 | return -EIO; | |
4e9e7f18 | 712 | |
73ae2b7d TG |
713 | if (data) |
714 | memcpy(data, attr_data, sizeof(struct in6_addr)); | |
4e9e7f18 SS |
715 | |
716 | return 0; | |
717 | } | |
718 | ||
f663aeb8 TG |
719 | static int netlink_container_parse(sd_netlink_message *m, |
720 | struct netlink_container *container, | |
721 | int count, | |
722 | struct rtattr *rta, | |
723 | unsigned int rt_len) { | |
724 | _cleanup_free_ struct netlink_attribute *attributes = NULL; | |
4203fc8b | 725 | |
f663aeb8 TG |
726 | attributes = new0(struct netlink_attribute, count); |
727 | if(!attributes) | |
4203fc8b TG |
728 | return -ENOMEM; |
729 | ||
4203fc8b | 730 | for (; RTA_OK(rta, rt_len); rta = RTA_NEXT(rta, rt_len)) { |
f663aeb8 TG |
731 | unsigned short type; |
732 | ||
4203fc8b TG |
733 | type = RTA_TYPE(rta); |
734 | ||
735 | /* if the kernel is newer than the headers we used | |
f663aeb8 | 736 | when building, we ignore out-of-range attributes */ |
4203fc8b TG |
737 | if (type >= count) |
738 | continue; | |
739 | ||
f663aeb8 | 740 | if (attributes[type].offset) |
4203fc8b TG |
741 | log_debug("rtnl: message parse - overwriting repeated attribute"); |
742 | ||
f663aeb8 | 743 | attributes[type].offset = (uint8_t *) rta - (uint8_t *) m->hdr; |
4c641e99 TG |
744 | attributes[type].nested = RTA_FLAGS(rta) & NLA_F_NESTED; |
745 | attributes[type].net_byteorder = RTA_FLAGS(rta) & NLA_F_NET_BYTEORDER; | |
4203fc8b TG |
746 | } |
747 | ||
f663aeb8 TG |
748 | container->attributes = attributes; |
749 | attributes = NULL; | |
750 | container->n_attributes = count; | |
4203fc8b TG |
751 | |
752 | return 0; | |
753 | } | |
754 | ||
817d1cd8 | 755 | int sd_netlink_message_enter_container(sd_netlink_message *m, unsigned short type_id) { |
d8e538ec TG |
756 | const NLType *nl_type; |
757 | const NLTypeSystem *type_system; | |
3dd215e0 | 758 | void *container; |
817d1cd8 | 759 | uint16_t type; |
d8e538ec TG |
760 | size_t size; |
761 | int r; | |
3dd215e0 TG |
762 | |
763 | assert_return(m, -EINVAL); | |
764 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -EINVAL); | |
765 | ||
f663aeb8 | 766 | r = type_system_get_type(m->containers[m->n_containers].type_system, |
d8e538ec | 767 | &nl_type, |
817d1cd8 | 768 | type_id); |
3dd215e0 TG |
769 | if (r < 0) |
770 | return r; | |
3dd215e0 | 771 | |
817d1cd8 DH |
772 | type = type_get_type(nl_type); |
773 | ||
774 | if (type == NETLINK_TYPE_NESTED) { | |
f663aeb8 | 775 | r = type_system_get_type_system(m->containers[m->n_containers].type_system, |
d8e538ec | 776 | &type_system, |
817d1cd8 | 777 | type_id); |
d8e538ec TG |
778 | if (r < 0) |
779 | return r; | |
817d1cd8 | 780 | } else if (type == NETLINK_TYPE_UNION) { |
d8e538ec | 781 | const NLTypeSystemUnion *type_system_union; |
d8e538ec | 782 | |
f663aeb8 | 783 | r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, |
d8e538ec | 784 | &type_system_union, |
817d1cd8 | 785 | type_id); |
d8e538ec TG |
786 | if (r < 0) |
787 | return r; | |
788 | ||
4af7b60d TG |
789 | switch (type_system_union->match_type) { |
790 | case NL_MATCH_SIBLING: | |
791 | { | |
792 | const char *key; | |
793 | ||
1c4baffc | 794 | r = sd_netlink_message_read_string(m, type_system_union->match, &key); |
4af7b60d TG |
795 | if (r < 0) |
796 | return r; | |
797 | ||
798 | r = type_system_union_get_type_system(type_system_union, | |
799 | &type_system, | |
800 | key); | |
801 | if (r < 0) | |
802 | return r; | |
803 | ||
804 | break; | |
805 | } | |
806 | case NL_MATCH_PROTOCOL: | |
807 | { | |
808 | int family; | |
809 | ||
89489ef7 | 810 | r = sd_rtnl_message_get_family(m, &family); |
4af7b60d TG |
811 | if (r < 0) |
812 | return r; | |
813 | ||
814 | r = type_system_union_protocol_get_type_system(type_system_union, | |
815 | &type_system, | |
816 | family); | |
817 | if (r < 0) | |
818 | return r; | |
819 | ||
820 | break; | |
821 | } | |
822 | default: | |
1c4baffc | 823 | assert_not_reached("sd-netlink: invalid type system union type"); |
4af7b60d | 824 | } |
d8e538ec TG |
825 | } else |
826 | return -EINVAL; | |
827 | ||
4c641e99 | 828 | r = netlink_message_read_internal(m, type_id, &container, NULL); |
3dd215e0 TG |
829 | if (r < 0) |
830 | return r; | |
d8e538ec TG |
831 | else |
832 | size = (size_t)r; | |
3dd215e0 | 833 | |
d8e538ec | 834 | m->n_containers ++; |
3dd215e0 | 835 | |
f663aeb8 TG |
836 | r = netlink_container_parse(m, |
837 | &m->containers[m->n_containers], | |
838 | type_system_get_count(type_system), | |
839 | container, | |
840 | size); | |
d8e538ec TG |
841 | if (r < 0) { |
842 | m->n_containers --; | |
3dd215e0 | 843 | return r; |
d8e538ec | 844 | } |
3dd215e0 | 845 | |
f663aeb8 | 846 | m->containers[m->n_containers].type_system = type_system; |
3dd215e0 TG |
847 | |
848 | return 0; | |
849 | } | |
850 | ||
1c4baffc | 851 | int sd_netlink_message_exit_container(sd_netlink_message *m) { |
e5c4350b TG |
852 | assert_return(m, -EINVAL); |
853 | assert_return(m->sealed, -EINVAL); | |
854 | assert_return(m->n_containers > 0, -EINVAL); | |
855 | ||
a1e58e8e | 856 | m->containers[m->n_containers].attributes = mfree(m->containers[m->n_containers].attributes); |
f663aeb8 | 857 | m->containers[m->n_containers].type_system = NULL; |
3dd215e0 | 858 | |
e5c4350b TG |
859 | m->n_containers --; |
860 | ||
861 | return 0; | |
862 | } | |
863 | ||
1c4baffc | 864 | uint32_t rtnl_message_get_serial(sd_netlink_message *m) { |
65f568bb | 865 | assert(m); |
9d0db178 | 866 | assert(m->hdr); |
65f568bb TG |
867 | |
868 | return m->hdr->nlmsg_seq; | |
869 | } | |
870 | ||
1c4baffc | 871 | int sd_netlink_message_is_error(sd_netlink_message *m) { |
45af44d4 TG |
872 | assert_return(m, 0); |
873 | assert_return(m->hdr, 0); | |
874 | ||
875 | return m->hdr->nlmsg_type == NLMSG_ERROR; | |
876 | } | |
877 | ||
1c4baffc | 878 | int sd_netlink_message_get_errno(sd_netlink_message *m) { |
65f568bb TG |
879 | struct nlmsgerr *err; |
880 | ||
e16bcf98 | 881 | assert_return(m, -EINVAL); |
9d0db178 | 882 | assert_return(m->hdr, -EINVAL); |
65f568bb | 883 | |
1c4baffc | 884 | if (!sd_netlink_message_is_error(m)) |
65f568bb TG |
885 | return 0; |
886 | ||
887 | err = NLMSG_DATA(m->hdr); | |
888 | ||
889 | return err->error; | |
890 | } | |
891 | ||
1c4baffc | 892 | int sd_netlink_message_rewind(sd_netlink_message *m) { |
817d1cd8 DH |
893 | const NLType *nl_type; |
894 | uint16_t type; | |
895 | size_t size; | |
3dd215e0 TG |
896 | unsigned i; |
897 | int r; | |
0fc7531b TG |
898 | |
899 | assert_return(m, -EINVAL); | |
0fc7531b | 900 | |
3dd215e0 TG |
901 | /* don't allow appending to message once parsed */ |
902 | if (!m->sealed) | |
903 | rtnl_message_seal(m); | |
904 | ||
1f6b4113 | 905 | for (i = 1; i <= m->n_containers; i++) |
a1e58e8e | 906 | m->containers[i].attributes = mfree(m->containers[i].attributes); |
3dd215e0 TG |
907 | |
908 | m->n_containers = 0; | |
909 | ||
ece174c5 | 910 | if (m->containers[0].attributes) |
3dd215e0 TG |
911 | /* top-level attributes have already been parsed */ |
912 | return 0; | |
3dd215e0 | 913 | |
d8e538ec TG |
914 | assert(m->hdr); |
915 | ||
846a6b3d | 916 | r = type_system_get_type(&type_system_root, &nl_type, m->hdr->nlmsg_type); |
d8e538ec TG |
917 | if (r < 0) |
918 | return r; | |
919 | ||
817d1cd8 DH |
920 | type = type_get_type(nl_type); |
921 | size = type_get_size(nl_type); | |
922 | ||
923 | if (type == NETLINK_TYPE_NESTED) { | |
c658008f | 924 | const NLTypeSystem *type_system; |
d8e538ec | 925 | |
817d1cd8 | 926 | type_get_type_system(nl_type, &type_system); |
d8e538ec | 927 | |
f663aeb8 | 928 | m->containers[0].type_system = type_system; |
d8e538ec | 929 | |
f663aeb8 TG |
930 | r = netlink_container_parse(m, |
931 | &m->containers[m->n_containers], | |
932 | type_system_get_count(type_system), | |
933 | (struct rtattr*)((uint8_t*)NLMSG_DATA(m->hdr) + NLMSG_ALIGN(size)), | |
934 | NLMSG_PAYLOAD(m->hdr, size)); | |
d8e538ec TG |
935 | if (r < 0) |
936 | return r; | |
0fc7531b TG |
937 | } |
938 | ||
939 | return 0; | |
940 | } | |
3dd215e0 | 941 | |
1c4baffc | 942 | void rtnl_message_seal(sd_netlink_message *m) { |
3dd215e0 TG |
943 | assert(m); |
944 | assert(!m->sealed); | |
945 | ||
946 | m->sealed = true; | |
947 | } | |
1403f45a | 948 | |
1c4baffc | 949 | sd_netlink_message *sd_netlink_message_next(sd_netlink_message *m) { |
1403f45a TG |
950 | assert_return(m, NULL); |
951 | ||
952 | return m->next; | |
953 | } |