]>
Commit | Line | Data |
---|---|---|
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> | |
23 | #include <netinet/ether.h> | |
24 | #include <stdbool.h> | |
25 | #include <unistd.h> | |
26 | ||
27 | #include "util.h" | |
28 | #include "refcnt.h" | |
d5eff740 | 29 | #include "missing.h" |
65f568bb TG |
30 | |
31 | #include "sd-rtnl.h" | |
3815f36f | 32 | #include "rtnl-util.h" |
65f568bb | 33 | #include "rtnl-internal.h" |
d8e538ec | 34 | #include "rtnl-types.h" |
65f568bb | 35 | |
31a4e153 | 36 | #define GET_CONTAINER(m, i) ((i) < (m)->n_containers ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->container_offsets[i]) : NULL) |
e5c4350b | 37 | #define PUSH_CONTAINER(m, new) (m)->container_offsets[(m)->n_containers ++] = (uint8_t*)(new) - (uint8_t*)(m)->hdr; |
4ebe732c | 38 | |
0a2478a9 TG |
39 | #define RTA_TYPE(rta) ((rta)->rta_type & NLA_TYPE_MASK) |
40 | ||
1b89cf56 | 41 | static int message_new_empty(sd_rtnl *rtnl, sd_rtnl_message **ret) { |
65f568bb TG |
42 | sd_rtnl_message *m; |
43 | ||
44 | assert_return(ret, -EINVAL); | |
65f568bb | 45 | |
8c578303 TG |
46 | /* Note that 'rtnl' is curretly unused, if we start using it internally |
47 | we must take care to avoid problems due to mutual references between | |
48 | busses and their queued messages. See sd-bus. | |
49 | */ | |
50 | ||
65f568bb TG |
51 | m = new0(sd_rtnl_message, 1); |
52 | if (!m) | |
53 | return -ENOMEM; | |
54 | ||
65f568bb TG |
55 | m->n_ref = REFCNT_INIT; |
56 | ||
65f568bb TG |
57 | m->sealed = false; |
58 | ||
59 | *ret = m; | |
60 | ||
61 | return 0; | |
62 | } | |
63 | ||
d8e538ec | 64 | int message_new(sd_rtnl *rtnl, sd_rtnl_message **ret, uint16_t type) { |
1b89cf56 | 65 | _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL; |
d8e538ec TG |
66 | const NLType *nl_type; |
67 | size_t size; | |
68 | int r; | |
69 | ||
70 | r = type_system_get_type(NULL, &nl_type, type); | |
71 | if (r < 0) | |
72 | return r; | |
73 | ||
74 | assert(nl_type->type == NLA_NESTED); | |
75 | ||
1b89cf56 | 76 | r = message_new_empty(rtnl, &m); |
d8e538ec TG |
77 | if (r < 0) |
78 | return r; | |
79 | ||
1b89cf56 TG |
80 | size = NLMSG_SPACE(nl_type->size); |
81 | ||
82 | assert(size >= sizeof(struct nlmsghdr)); | |
83 | m->hdr = malloc0(size); | |
84 | if (!m->hdr) | |
85 | return -ENOMEM; | |
86 | ||
87 | m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; | |
88 | ||
89 | m->container_type_system[0] = nl_type->type_system; | |
90 | m->hdr->nlmsg_len = size; | |
91 | m->hdr->nlmsg_type = type; | |
92 | ||
93 | *ret = m; | |
94 | m = NULL; | |
d8e538ec TG |
95 | |
96 | return 0; | |
97 | } | |
98 | ||
1f01fb4f TG |
99 | int sd_rtnl_message_route_set_dst_prefixlen(sd_rtnl_message *m, unsigned char prefixlen) { |
100 | struct rtmsg *rtm; | |
101 | ||
5a723174 TG |
102 | assert_return(m, -EINVAL); |
103 | assert_return(m->hdr, -EINVAL); | |
3815f36f | 104 | assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); |
5a723174 | 105 | |
1f01fb4f TG |
106 | rtm = NLMSG_DATA(m->hdr); |
107 | ||
5a723174 TG |
108 | if ((rtm->rtm_family == AF_INET && prefixlen > 32) || |
109 | (rtm->rtm_family == AF_INET6 && prefixlen > 128)) | |
110 | return -ERANGE; | |
111 | ||
1f01fb4f TG |
112 | rtm->rtm_dst_len = prefixlen; |
113 | ||
5c1d3fc9 UTL |
114 | return 0; |
115 | } | |
116 | ||
117 | int sd_rtnl_message_route_set_scope(sd_rtnl_message *m, unsigned char scope) { | |
118 | struct rtmsg *rtm; | |
119 | ||
120 | assert_return(m, -EINVAL); | |
121 | assert_return(m->hdr, -EINVAL); | |
122 | assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); | |
123 | ||
124 | rtm = NLMSG_DATA(m->hdr); | |
125 | ||
126 | rtm->rtm_scope = scope; | |
127 | ||
1f01fb4f TG |
128 | return 0; |
129 | } | |
130 | ||
dae4de9d TG |
131 | int sd_rtnl_message_route_get_family(sd_rtnl_message *m, int *family) { |
132 | struct rtmsg *rtm; | |
133 | ||
134 | assert_return(m, -EINVAL); | |
135 | assert_return(m->hdr, -EINVAL); | |
136 | assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); | |
137 | assert_return(family, -EINVAL); | |
138 | ||
139 | rtm = NLMSG_DATA(m->hdr); | |
140 | ||
141 | *family = rtm->rtm_family; | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
151b9b96 | 146 | int sd_rtnl_message_new_route(sd_rtnl *rtnl, sd_rtnl_message **ret, |
28cc555d DW |
147 | uint16_t nlmsg_type, int rtm_family, |
148 | unsigned char rtm_protocol) { | |
03d7e632 TG |
149 | struct rtmsg *rtm; |
150 | int r; | |
151 | ||
3815f36f | 152 | assert_return(rtnl_message_type_is_route(nlmsg_type), -EINVAL); |
1f01fb4f | 153 | assert_return(rtm_family == AF_INET || rtm_family == AF_INET6, -EINVAL); |
03d7e632 TG |
154 | assert_return(ret, -EINVAL); |
155 | ||
d8e538ec | 156 | r = message_new(rtnl, ret, nlmsg_type); |
03d7e632 TG |
157 | if (r < 0) |
158 | return r; | |
159 | ||
03d7e632 | 160 | if (nlmsg_type == RTM_NEWROUTE) |
3f781aa8 | 161 | (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_APPEND; |
03d7e632 TG |
162 | |
163 | rtm = NLMSG_DATA((*ret)->hdr); | |
164 | ||
165 | rtm->rtm_family = rtm_family; | |
1f01fb4f TG |
166 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; |
167 | rtm->rtm_type = RTN_UNICAST; | |
168 | rtm->rtm_table = RT_TABLE_MAIN; | |
28cc555d | 169 | rtm->rtm_protocol = rtm_protocol; |
03d7e632 TG |
170 | |
171 | return 0; | |
172 | } | |
173 | ||
5d4795f3 | 174 | int sd_rtnl_message_link_set_flags(sd_rtnl_message *m, unsigned flags, unsigned change) { |
fc25d7f8 TG |
175 | struct ifinfomsg *ifi; |
176 | ||
5a723174 TG |
177 | assert_return(m, -EINVAL); |
178 | assert_return(m->hdr, -EINVAL); | |
3815f36f | 179 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); |
a7b74db6 | 180 | assert_return(change, -EINVAL); |
5a723174 | 181 | |
fc25d7f8 TG |
182 | ifi = NLMSG_DATA(m->hdr); |
183 | ||
184 | ifi->ifi_flags = flags; | |
a7b74db6 | 185 | ifi->ifi_change = change; |
fc25d7f8 TG |
186 | |
187 | return 0; | |
188 | } | |
189 | ||
190 | int sd_rtnl_message_link_set_type(sd_rtnl_message *m, unsigned type) { | |
191 | struct ifinfomsg *ifi; | |
192 | ||
5a723174 TG |
193 | assert_return(m, -EINVAL); |
194 | assert_return(m->hdr, -EINVAL); | |
3815f36f | 195 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); |
5a723174 | 196 | |
fc25d7f8 TG |
197 | ifi = NLMSG_DATA(m->hdr); |
198 | ||
199 | ifi->ifi_type = type; | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
64c84071 SS |
204 | int sd_rtnl_message_link_set_family(sd_rtnl_message *m, unsigned family) { |
205 | struct ifinfomsg *ifi; | |
206 | ||
207 | assert_return(m, -EINVAL); | |
208 | assert_return(m->hdr, -EINVAL); | |
209 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); | |
210 | ||
211 | ifi = NLMSG_DATA(m->hdr); | |
212 | ||
213 | ifi->ifi_family = family; | |
214 | ||
215 | return 0; | |
216 | } | |
217 | ||
151b9b96 LP |
218 | int sd_rtnl_message_new_link(sd_rtnl *rtnl, sd_rtnl_message **ret, |
219 | uint16_t nlmsg_type, int index) { | |
65f568bb TG |
220 | struct ifinfomsg *ifi; |
221 | int r; | |
222 | ||
3815f36f | 223 | assert_return(rtnl_message_type_is_link(nlmsg_type), -EINVAL); |
6a8402d9 | 224 | assert_return(nlmsg_type != RTM_DELLINK || index > 0, -EINVAL); |
65f568bb TG |
225 | assert_return(ret, -EINVAL); |
226 | ||
d8e538ec | 227 | r = message_new(rtnl, ret, nlmsg_type); |
65f568bb TG |
228 | if (r < 0) |
229 | return r; | |
230 | ||
33125ac5 | 231 | if (nlmsg_type == RTM_NEWLINK) |
6a8402d9 | 232 | (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL; |
65f568bb | 233 | |
dabfa9d1 | 234 | ifi = NLMSG_DATA((*ret)->hdr); |
65f568bb TG |
235 | |
236 | ifi->ifi_family = AF_UNSPEC; | |
237 | ifi->ifi_index = index; | |
65f568bb TG |
238 | |
239 | return 0; | |
240 | } | |
241 | ||
6e20c8f8 TG |
242 | int sd_rtnl_message_request_dump(sd_rtnl_message *m, int dump) { |
243 | assert_return(m, -EINVAL); | |
244 | assert_return(m->hdr, -EINVAL); | |
245 | assert_return(m->hdr->nlmsg_type == RTM_GETLINK || | |
246 | m->hdr->nlmsg_type == RTM_GETADDR || | |
247 | m->hdr->nlmsg_type == RTM_GETROUTE, | |
248 | -EINVAL); | |
249 | ||
250 | if (dump) | |
251 | m->hdr->nlmsg_flags |= NLM_F_DUMP; | |
252 | else | |
253 | m->hdr->nlmsg_flags &= ~NLM_F_DUMP; | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
5a723174 TG |
258 | int sd_rtnl_message_addr_set_prefixlen(sd_rtnl_message *m, unsigned char prefixlen) { |
259 | struct ifaddrmsg *ifa; | |
260 | ||
261 | assert_return(m, -EINVAL); | |
262 | assert_return(m->hdr, -EINVAL); | |
3815f36f | 263 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); |
5a723174 TG |
264 | |
265 | ifa = NLMSG_DATA(m->hdr); | |
266 | ||
267 | if ((ifa->ifa_family == AF_INET && prefixlen > 32) || | |
268 | (ifa->ifa_family == AF_INET6 && prefixlen > 128)) | |
269 | return -ERANGE; | |
270 | ||
271 | ifa->ifa_prefixlen = prefixlen; | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | int sd_rtnl_message_addr_set_flags(sd_rtnl_message *m, unsigned char flags) { | |
277 | struct ifaddrmsg *ifa; | |
278 | ||
279 | assert_return(m, -EINVAL); | |
280 | assert_return(m->hdr, -EINVAL); | |
3815f36f | 281 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); |
5a723174 TG |
282 | |
283 | ifa = NLMSG_DATA(m->hdr); | |
284 | ||
285 | ifa->ifa_flags = flags; | |
286 | ||
287 | return 0; | |
288 | } | |
289 | ||
290 | int sd_rtnl_message_addr_set_scope(sd_rtnl_message *m, unsigned char scope) { | |
291 | struct ifaddrmsg *ifa; | |
292 | ||
293 | assert_return(m, -EINVAL); | |
294 | assert_return(m->hdr, -EINVAL); | |
3815f36f | 295 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); |
5a723174 TG |
296 | |
297 | ifa = NLMSG_DATA(m->hdr); | |
298 | ||
299 | ifa->ifa_scope = scope; | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
0dd25fb9 | 304 | int sd_rtnl_message_addr_get_family(sd_rtnl_message *m, int *family) { |
e00d77dd TG |
305 | struct ifaddrmsg *ifa; |
306 | ||
307 | assert_return(m, -EINVAL); | |
308 | assert_return(m->hdr, -EINVAL); | |
309 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
310 | assert_return(family, -EINVAL); | |
311 | ||
312 | ifa = NLMSG_DATA(m->hdr); | |
313 | ||
314 | *family = ifa->ifa_family; | |
315 | ||
316 | return 0; | |
317 | } | |
318 | ||
f4e884dd TG |
319 | int sd_rtnl_message_addr_get_prefixlen(sd_rtnl_message *m, unsigned char *prefixlen) { |
320 | struct ifaddrmsg *ifa; | |
321 | ||
322 | assert_return(m, -EINVAL); | |
323 | assert_return(m->hdr, -EINVAL); | |
324 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
325 | assert_return(prefixlen, -EINVAL); | |
326 | ||
327 | ifa = NLMSG_DATA(m->hdr); | |
328 | ||
329 | *prefixlen = ifa->ifa_prefixlen; | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
e00d77dd TG |
334 | int sd_rtnl_message_addr_get_scope(sd_rtnl_message *m, unsigned char *scope) { |
335 | struct ifaddrmsg *ifa; | |
336 | ||
337 | assert_return(m, -EINVAL); | |
338 | assert_return(m->hdr, -EINVAL); | |
339 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
340 | assert_return(scope, -EINVAL); | |
341 | ||
342 | ifa = NLMSG_DATA(m->hdr); | |
343 | ||
344 | *scope = ifa->ifa_scope; | |
345 | ||
346 | return 0; | |
347 | } | |
348 | ||
349 | int sd_rtnl_message_addr_get_flags(sd_rtnl_message *m, unsigned char *flags) { | |
350 | struct ifaddrmsg *ifa; | |
351 | ||
352 | assert_return(m, -EINVAL); | |
353 | assert_return(m->hdr, -EINVAL); | |
354 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
355 | assert_return(flags, -EINVAL); | |
356 | ||
357 | ifa = NLMSG_DATA(m->hdr); | |
358 | ||
359 | *flags = ifa->ifa_flags; | |
360 | ||
361 | return 0; | |
362 | } | |
363 | ||
364 | int sd_rtnl_message_addr_get_ifindex(sd_rtnl_message *m, int *ifindex) { | |
365 | struct ifaddrmsg *ifa; | |
366 | ||
367 | assert_return(m, -EINVAL); | |
368 | assert_return(m->hdr, -EINVAL); | |
369 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
370 | assert_return(ifindex, -EINVAL); | |
371 | ||
372 | ifa = NLMSG_DATA(m->hdr); | |
373 | ||
374 | *ifindex = ifa->ifa_index; | |
375 | ||
376 | return 0; | |
377 | } | |
378 | ||
151b9b96 LP |
379 | int sd_rtnl_message_new_addr(sd_rtnl *rtnl, sd_rtnl_message **ret, |
380 | uint16_t nlmsg_type, int index, | |
0dd25fb9 | 381 | int family) { |
65f568bb TG |
382 | struct ifaddrmsg *ifa; |
383 | int r; | |
384 | ||
3815f36f | 385 | assert_return(rtnl_message_type_is_addr(nlmsg_type), -EINVAL); |
b9ef681b TG |
386 | assert_return((nlmsg_type == RTM_GETADDR && index == 0) || |
387 | index > 0, -EINVAL); | |
388 | assert_return((nlmsg_type == RTM_GETADDR && family == AF_UNSPEC) || | |
389 | family == AF_INET || family == AF_INET6, -EINVAL); | |
65f568bb TG |
390 | assert_return(ret, -EINVAL); |
391 | ||
d8e538ec | 392 | r = message_new(rtnl, ret, nlmsg_type); |
65f568bb TG |
393 | if (r < 0) |
394 | return r; | |
395 | ||
b9ef681b | 396 | if (nlmsg_type == RTM_GETADDR) |
818dc5e7 | 397 | (*ret)->hdr->nlmsg_flags |= NLM_F_DUMP; |
65f568bb | 398 | |
dabfa9d1 | 399 | ifa = NLMSG_DATA((*ret)->hdr); |
65f568bb | 400 | |
65f568bb | 401 | ifa->ifa_index = index; |
5a723174 TG |
402 | ifa->ifa_family = family; |
403 | if (family == AF_INET) | |
404 | ifa->ifa_prefixlen = 32; | |
405 | else if (family == AF_INET6) | |
406 | ifa->ifa_prefixlen = 128; | |
65f568bb TG |
407 | |
408 | return 0; | |
409 | } | |
410 | ||
aba496a5 | 411 | int sd_rtnl_message_new_addr_update(sd_rtnl *rtnl, sd_rtnl_message **ret, |
0dd25fb9 | 412 | int index, int family) { |
aba496a5 UTL |
413 | int r; |
414 | ||
415 | r = sd_rtnl_message_new_addr(rtnl, ret, RTM_NEWADDR, index, family); | |
416 | if (r < 0) | |
417 | return r; | |
418 | ||
419 | (*ret)->hdr->nlmsg_flags |= NLM_F_REPLACE; | |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
65f568bb TG |
424 | sd_rtnl_message *sd_rtnl_message_ref(sd_rtnl_message *m) { |
425 | if (m) | |
426 | assert_se(REFCNT_INC(m->n_ref) >= 2); | |
427 | ||
428 | return m; | |
429 | } | |
430 | ||
431 | sd_rtnl_message *sd_rtnl_message_unref(sd_rtnl_message *m) { | |
432 | if (m && REFCNT_DEC(m->n_ref) <= 0) { | |
3dd215e0 TG |
433 | unsigned i; |
434 | ||
65f568bb | 435 | free(m->hdr); |
3dd215e0 | 436 | |
9f5bbfe3 | 437 | for (i = 0; i <= m->n_containers; i++) |
3dd215e0 TG |
438 | free(m->rta_offset_tb[i]); |
439 | ||
1403f45a TG |
440 | sd_rtnl_message_unref(m->next); |
441 | ||
65f568bb TG |
442 | free(m); |
443 | } | |
444 | ||
445 | return NULL; | |
446 | } | |
447 | ||
dabfa9d1 | 448 | int sd_rtnl_message_get_type(sd_rtnl_message *m, uint16_t *type) { |
65f568bb TG |
449 | assert_return(m, -EINVAL); |
450 | assert_return(type, -EINVAL); | |
451 | ||
452 | *type = m->hdr->nlmsg_type; | |
453 | ||
454 | return 0; | |
455 | } | |
456 | ||
1f0db3ed TG |
457 | int sd_rtnl_message_is_broadcast(sd_rtnl_message *m) { |
458 | assert_return(m, -EINVAL); | |
459 | ||
460 | return !m->hdr->nlmsg_pid; | |
461 | } | |
462 | ||
33125ac5 TG |
463 | int sd_rtnl_message_link_get_ifindex(sd_rtnl_message *m, int *ifindex) { |
464 | struct ifinfomsg *ifi; | |
465 | ||
466 | assert_return(m, -EINVAL); | |
9d0db178 | 467 | assert_return(m->hdr, -EINVAL); |
3815f36f | 468 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); |
33125ac5 | 469 | assert_return(ifindex, -EINVAL); |
33125ac5 TG |
470 | |
471 | ifi = NLMSG_DATA(m->hdr); | |
472 | ||
473 | *ifindex = ifi->ifi_index; | |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
50b3c42f TG |
478 | int sd_rtnl_message_link_get_flags(sd_rtnl_message *m, unsigned *flags) { |
479 | struct ifinfomsg *ifi; | |
480 | ||
481 | assert_return(m, -EINVAL); | |
9d0db178 | 482 | assert_return(m->hdr, -EINVAL); |
3815f36f | 483 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); |
50b3c42f | 484 | assert_return(flags, -EINVAL); |
50b3c42f TG |
485 | |
486 | ifi = NLMSG_DATA(m->hdr); | |
487 | ||
488 | *flags = ifi->ifi_flags; | |
489 | ||
490 | return 0; | |
491 | } | |
492 | ||
ee8c4568 LP |
493 | int sd_rtnl_message_link_get_type(sd_rtnl_message *m, unsigned *type) { |
494 | struct ifinfomsg *ifi; | |
495 | ||
496 | assert_return(m, -EINVAL); | |
497 | assert_return(m->hdr, -EINVAL); | |
498 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); | |
499 | assert_return(type, -EINVAL); | |
500 | ||
501 | ifi = NLMSG_DATA(m->hdr); | |
502 | ||
503 | *type = ifi->ifi_type; | |
504 | ||
505 | return 0; | |
506 | } | |
507 | ||
4ebe732c ZJS |
508 | /* If successful the updated message will be correctly aligned, if |
509 | unsuccessful the old message is untouched. */ | |
65f568bb | 510 | static int add_rtattr(sd_rtnl_message *m, unsigned short type, const void *data, size_t data_length) { |
7ca1d319 TG |
511 | uint32_t rta_length; |
512 | size_t message_length, padding_length; | |
65f568bb TG |
513 | struct nlmsghdr *new_hdr; |
514 | struct rtattr *rta; | |
8e337e64 | 515 | char *padding; |
5a081409 | 516 | unsigned i; |
7ca1d319 | 517 | int offset; |
65f568bb | 518 | |
33125ac5 TG |
519 | assert(m); |
520 | assert(m->hdr); | |
e5c4350b | 521 | assert(!m->sealed); |
33125ac5 | 522 | assert(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len); |
7ca1d319 TG |
523 | assert(!data || data_length); |
524 | ||
525 | /* get offset of the new attribute */ | |
526 | offset = m->hdr->nlmsg_len; | |
65f568bb | 527 | |
8e337e64 | 528 | /* get the size of the new rta attribute (with padding at the end) */ |
65f568bb | 529 | rta_length = RTA_LENGTH(data_length); |
4ebe732c ZJS |
530 | |
531 | /* get the new message size (with padding at the end) */ | |
7ca1d319 | 532 | message_length = offset + RTA_ALIGN(rta_length); |
65f568bb TG |
533 | |
534 | /* realloc to fit the new attribute */ | |
535 | new_hdr = realloc(m->hdr, message_length); | |
536 | if (!new_hdr) | |
537 | return -ENOMEM; | |
538 | m->hdr = new_hdr; | |
539 | ||
540 | /* get pointer to the attribute we are about to add */ | |
7ca1d319 | 541 | rta = (struct rtattr *) ((uint8_t *) m->hdr + offset); |
65f568bb | 542 | |
5a081409 TG |
543 | /* if we are inside containers, extend them */ |
544 | for (i = 0; i < m->n_containers; i++) | |
7ca1d319 | 545 | GET_CONTAINER(m, i)->rta_len += message_length - offset; |
33125ac5 | 546 | |
65f568bb TG |
547 | /* fill in the attribute */ |
548 | rta->rta_type = type; | |
549 | rta->rta_len = rta_length; | |
7ca1d319 | 550 | if (data) |
33125ac5 TG |
551 | /* we don't deal with the case where the user lies about the type |
552 | * and gives us too little data (so don't do that) | |
7ca1d319 | 553 | */ |
33125ac5 | 554 | padding = mempcpy(RTA_DATA(rta), data, data_length); |
7ca1d319 TG |
555 | else { |
556 | /* if no data was passed, make sure we still initialize the padding | |
557 | note that we can have data_length > 0 (used by some containers) */ | |
558 | padding = RTA_DATA(rta); | |
33125ac5 | 559 | } |
65f568bb | 560 | |
7ca1d319 TG |
561 | /* make sure also the padding at the end of the message is initialized */ |
562 | padding_length = (uint8_t*)m->hdr + message_length - (uint8_t*)padding; | |
563 | memzero(padding, padding_length); | |
564 | ||
4ebe732c ZJS |
565 | /* update message size */ |
566 | m->hdr->nlmsg_len = message_length; | |
567 | ||
7ca1d319 | 568 | return offset; |
65f568bb TG |
569 | } |
570 | ||
d8e538ec TG |
571 | static int message_attribute_has_type(sd_rtnl_message *m, uint16_t attribute_type, uint16_t data_type) { |
572 | const NLType *type; | |
573 | int r; | |
574 | ||
575 | r = type_system_get_type(m->container_type_system[m->n_containers], &type, attribute_type); | |
576 | if (r < 0) | |
577 | return r; | |
578 | ||
579 | if (type->type != data_type) | |
580 | return -EINVAL; | |
581 | ||
582 | return type->size; | |
583 | } | |
584 | ||
0a0dc69b | 585 | int sd_rtnl_message_append_string(sd_rtnl_message *m, unsigned short type, const char *data) { |
d8e538ec | 586 | size_t length, size; |
0a0dc69b | 587 | int r; |
65f568bb TG |
588 | |
589 | assert_return(m, -EINVAL); | |
e5c4350b | 590 | assert_return(!m->sealed, -EPERM); |
65f568bb TG |
591 | assert_return(data, -EINVAL); |
592 | ||
d8e538ec | 593 | r = message_attribute_has_type(m, type, NLA_STRING); |
0a0dc69b TG |
594 | if (r < 0) |
595 | return r; | |
d8e538ec TG |
596 | else |
597 | size = (size_t)r; | |
65f568bb | 598 | |
d8e538ec TG |
599 | if (size) { |
600 | length = strnlen(data, size); | |
601 | if (length >= size) | |
602 | return -EINVAL; | |
603 | } else | |
604 | length = strlen(data); | |
33125ac5 | 605 | |
d8e538ec | 606 | r = add_rtattr(m, type, data, length + 1); |
0a0dc69b TG |
607 | if (r < 0) |
608 | return r; | |
609 | ||
610 | return 0; | |
611 | } | |
612 | ||
7b179640 | 613 | int sd_rtnl_message_append_u8(sd_rtnl_message *m, unsigned short type, uint8_t data) { |
7b179640 SS |
614 | int r; |
615 | ||
616 | assert_return(m, -EINVAL); | |
617 | assert_return(!m->sealed, -EPERM); | |
618 | ||
d8e538ec | 619 | r = message_attribute_has_type(m, type, NLA_U8); |
7b179640 SS |
620 | if (r < 0) |
621 | return r; | |
622 | ||
7b179640 SS |
623 | r = add_rtattr(m, type, &data, sizeof(uint8_t)); |
624 | if (r < 0) | |
625 | return r; | |
626 | ||
627 | return 0; | |
628 | } | |
629 | ||
630 | ||
01b36069 | 631 | int sd_rtnl_message_append_u16(sd_rtnl_message *m, unsigned short type, uint16_t data) { |
01b36069 TG |
632 | int r; |
633 | ||
634 | assert_return(m, -EINVAL); | |
e5c4350b | 635 | assert_return(!m->sealed, -EPERM); |
01b36069 | 636 | |
d8e538ec | 637 | r = message_attribute_has_type(m, type, NLA_U16); |
01b36069 TG |
638 | if (r < 0) |
639 | return r; | |
640 | ||
01b36069 TG |
641 | r = add_rtattr(m, type, &data, sizeof(uint16_t)); |
642 | if (r < 0) | |
643 | return r; | |
644 | ||
645 | return 0; | |
646 | } | |
647 | ||
0a0dc69b | 648 | int sd_rtnl_message_append_u32(sd_rtnl_message *m, unsigned short type, uint32_t data) { |
0a0dc69b TG |
649 | int r; |
650 | ||
651 | assert_return(m, -EINVAL); | |
e5c4350b | 652 | assert_return(!m->sealed, -EPERM); |
0a0dc69b | 653 | |
d8e538ec | 654 | r = message_attribute_has_type(m, type, NLA_U32); |
0a0dc69b TG |
655 | if (r < 0) |
656 | return r; | |
657 | ||
4d47756b | 658 | r = add_rtattr(m, type, &data, sizeof(uint32_t)); |
0a0dc69b TG |
659 | if (r < 0) |
660 | return r; | |
661 | ||
662 | return 0; | |
663 | } | |
664 | ||
665 | int sd_rtnl_message_append_in_addr(sd_rtnl_message *m, unsigned short type, const struct in_addr *data) { | |
0a0dc69b TG |
666 | int r; |
667 | ||
668 | assert_return(m, -EINVAL); | |
e5c4350b | 669 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
670 | assert_return(data, -EINVAL); |
671 | ||
d8e538ec | 672 | r = message_attribute_has_type(m, type, NLA_IN_ADDR); |
0a0dc69b TG |
673 | if (r < 0) |
674 | return r; | |
675 | ||
4d47756b | 676 | r = add_rtattr(m, type, data, sizeof(struct in_addr)); |
0a0dc69b TG |
677 | if (r < 0) |
678 | return r; | |
679 | ||
680 | return 0; | |
681 | } | |
682 | ||
683 | int sd_rtnl_message_append_in6_addr(sd_rtnl_message *m, unsigned short type, const struct in6_addr *data) { | |
0a0dc69b TG |
684 | int r; |
685 | ||
686 | assert_return(m, -EINVAL); | |
e5c4350b | 687 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
688 | assert_return(data, -EINVAL); |
689 | ||
d8e538ec | 690 | r = message_attribute_has_type(m, type, NLA_IN_ADDR); |
0a0dc69b TG |
691 | if (r < 0) |
692 | return r; | |
693 | ||
4d47756b | 694 | r = add_rtattr(m, type, data, sizeof(struct in6_addr)); |
0a0dc69b TG |
695 | if (r < 0) |
696 | return r; | |
697 | ||
698 | return 0; | |
699 | } | |
700 | ||
701 | int sd_rtnl_message_append_ether_addr(sd_rtnl_message *m, unsigned short type, const struct ether_addr *data) { | |
0a0dc69b TG |
702 | int r; |
703 | ||
704 | assert_return(m, -EINVAL); | |
e5c4350b | 705 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
706 | assert_return(data, -EINVAL); |
707 | ||
d8e538ec TG |
708 | r = message_attribute_has_type(m, type, NLA_ETHER_ADDR); |
709 | if (r < 0) | |
710 | return r; | |
0a0dc69b | 711 | |
b9eaf3d1 | 712 | r = add_rtattr(m, type, data, ETH_ALEN); |
0a0dc69b TG |
713 | if (r < 0) |
714 | return r; | |
715 | ||
716 | return 0; | |
65f568bb TG |
717 | } |
718 | ||
aba496a5 UTL |
719 | int sd_rtnl_message_append_cache_info(sd_rtnl_message *m, unsigned short type, const struct ifa_cacheinfo *info) { |
720 | int r; | |
721 | ||
722 | assert_return(m, -EINVAL); | |
723 | assert_return(!m->sealed, -EPERM); | |
724 | assert_return(info, -EINVAL); | |
725 | ||
726 | r = message_attribute_has_type(m, type, NLA_CACHE_INFO); | |
727 | if (r < 0) | |
728 | return r; | |
729 | ||
730 | r = add_rtattr(m, type, info, sizeof(struct ifa_cacheinfo)); | |
731 | if (r < 0) | |
732 | return r; | |
733 | ||
734 | return 0; | |
735 | } | |
736 | ||
ee3a6a51 | 737 | int sd_rtnl_message_open_container(sd_rtnl_message *m, unsigned short type) { |
d8e538ec TG |
738 | size_t size; |
739 | int r; | |
33125ac5 | 740 | |
65f568bb | 741 | assert_return(m, -EINVAL); |
e5c4350b | 742 | assert_return(!m->sealed, -EPERM); |
7ca1d319 | 743 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -ERANGE); |
33125ac5 | 744 | |
d8e538ec TG |
745 | r = message_attribute_has_type(m, type, NLA_NESTED); |
746 | if (r < 0) | |
747 | return r; | |
748 | else | |
749 | size = (size_t)r; | |
33125ac5 | 750 | |
d8e538ec TG |
751 | r = type_system_get_type_system(m->container_type_system[m->n_containers], |
752 | &m->container_type_system[m->n_containers + 1], | |
753 | type); | |
754 | if (r < 0) | |
755 | return r; | |
31a4e153 | 756 | |
fcf81a54 | 757 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, size); |
d8e538ec TG |
758 | if (r < 0) |
759 | return r; | |
760 | ||
7ca1d319 TG |
761 | m->container_offsets[m->n_containers ++] = r; |
762 | ||
d8e538ec TG |
763 | return 0; |
764 | } | |
765 | ||
766 | int sd_rtnl_message_open_container_union(sd_rtnl_message *m, unsigned short type, const char *key) { | |
767 | const NLTypeSystemUnion *type_system_union; | |
768 | int r; | |
769 | ||
770 | assert_return(m, -EINVAL); | |
771 | assert_return(!m->sealed, -EPERM); | |
772 | ||
773 | r = type_system_get_type_system_union(m->container_type_system[m->n_containers], &type_system_union, type); | |
774 | if (r < 0) | |
775 | return r; | |
776 | ||
777 | r = type_system_union_get_type_system(type_system_union, | |
778 | &m->container_type_system[m->n_containers + 1], | |
779 | key); | |
780 | if (r < 0) | |
781 | return r; | |
33125ac5 | 782 | |
d8e538ec TG |
783 | r = sd_rtnl_message_append_string(m, type_system_union->match, key); |
784 | if (r < 0) | |
785 | return r; | |
786 | ||
787 | /* do we evere need non-null size */ | |
788 | r = add_rtattr(m, type, NULL, 0); | |
789 | if (r < 0) | |
790 | return r; | |
791 | ||
7ca1d319 TG |
792 | m->container_offsets[m->n_containers ++] = r; |
793 | ||
d8e538ec | 794 | return 0; |
33125ac5 TG |
795 | } |
796 | ||
d8e538ec | 797 | |
33125ac5 TG |
798 | int sd_rtnl_message_close_container(sd_rtnl_message *m) { |
799 | assert_return(m, -EINVAL); | |
e5c4350b | 800 | assert_return(!m->sealed, -EPERM); |
5a081409 | 801 | assert_return(m->n_containers > 0, -EINVAL); |
33125ac5 | 802 | |
d8e538ec | 803 | m->container_type_system[m->n_containers] = NULL; |
5a081409 | 804 | m->n_containers --; |
33125ac5 TG |
805 | |
806 | return 0; | |
807 | } | |
808 | ||
44caa5e7 | 809 | int rtnl_message_read_internal(sd_rtnl_message *m, unsigned short type, void **data) { |
f66eeb6b TG |
810 | struct rtattr *rta; |
811 | ||
44caa5e7 SS |
812 | assert_return(m, -EINVAL); |
813 | assert_return(m->sealed, -EPERM); | |
814 | assert_return(data, -EINVAL); | |
d8e538ec TG |
815 | assert(m->n_containers <= RTNL_CONTAINER_DEPTH); |
816 | assert(m->rta_offset_tb[m->n_containers]); | |
817 | assert(type < m->rta_tb_size[m->n_containers]); | |
44caa5e7 | 818 | |
3dd215e0 | 819 | if(!m->rta_offset_tb[m->n_containers][type]) |
44caa5e7 SS |
820 | return -ENODATA; |
821 | ||
3dd215e0 | 822 | rta = (struct rtattr*)((uint8_t *) m->hdr + m->rta_offset_tb[m->n_containers][type]); |
44caa5e7 | 823 | |
f66eeb6b TG |
824 | *data = RTA_DATA(rta); |
825 | ||
826 | return RTA_PAYLOAD(rta); | |
44caa5e7 SS |
827 | } |
828 | ||
ca4e095a | 829 | int sd_rtnl_message_read_string(sd_rtnl_message *m, unsigned short type, const char **data) { |
44caa5e7 SS |
830 | int r; |
831 | void *attr_data; | |
832 | ||
d8e538ec TG |
833 | r = message_attribute_has_type(m, type, NLA_STRING); |
834 | if (r < 0) | |
835 | return r; | |
44caa5e7 SS |
836 | |
837 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 838 | if (r < 0) |
44caa5e7 | 839 | return r; |
f66eeb6b TG |
840 | else if (strnlen(attr_data, r) >= (size_t) r) |
841 | return -EIO; | |
44caa5e7 | 842 | |
ca4e095a | 843 | *data = (const char *) attr_data; |
44caa5e7 SS |
844 | |
845 | return 0; | |
846 | } | |
847 | ||
848 | int sd_rtnl_message_read_u8(sd_rtnl_message *m, unsigned short type, uint8_t *data) { | |
849 | int r; | |
850 | void *attr_data; | |
851 | ||
d8e538ec TG |
852 | r = message_attribute_has_type(m, type, NLA_U8); |
853 | if (r < 0) | |
854 | return r; | |
44caa5e7 SS |
855 | |
856 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 857 | if (r < 0) |
44caa5e7 | 858 | return r; |
f66eeb6b TG |
859 | else if ((size_t) r < sizeof(uint8_t)) |
860 | return -EIO; | |
44caa5e7 SS |
861 | |
862 | *data = *(uint8_t *) attr_data; | |
863 | ||
864 | return 0; | |
865 | } | |
866 | ||
867 | int sd_rtnl_message_read_u16(sd_rtnl_message *m, unsigned short type, uint16_t *data) { | |
868 | int r; | |
869 | void *attr_data; | |
870 | ||
d8e538ec TG |
871 | r = message_attribute_has_type(m, type, NLA_U16); |
872 | if (r < 0) | |
873 | return r; | |
44caa5e7 SS |
874 | |
875 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 876 | if (r < 0) |
44caa5e7 | 877 | return r; |
f66eeb6b TG |
878 | else if ((size_t) r < sizeof(uint16_t)) |
879 | return -EIO; | |
44caa5e7 SS |
880 | |
881 | *data = *(uint16_t *) attr_data; | |
882 | ||
883 | return 0; | |
884 | } | |
885 | ||
886 | int sd_rtnl_message_read_u32(sd_rtnl_message *m, unsigned short type, uint32_t *data) { | |
887 | int r; | |
888 | void *attr_data; | |
889 | ||
d8e538ec TG |
890 | r = message_attribute_has_type(m, type, NLA_U32); |
891 | if (r < 0) | |
892 | return r; | |
44caa5e7 SS |
893 | |
894 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 895 | if (r < 0) |
44caa5e7 | 896 | return r; |
f66eeb6b TG |
897 | else if ((size_t)r < sizeof(uint32_t)) |
898 | return -EIO; | |
44caa5e7 SS |
899 | |
900 | *data = *(uint32_t *) attr_data; | |
901 | ||
902 | return 0; | |
903 | } | |
904 | ||
4e9e7f18 SS |
905 | int sd_rtnl_message_read_ether_addr(sd_rtnl_message *m, unsigned short type, struct ether_addr *data) { |
906 | int r; | |
907 | void *attr_data; | |
908 | ||
d8e538ec TG |
909 | r = message_attribute_has_type(m, type, NLA_ETHER_ADDR); |
910 | if (r < 0) | |
911 | return r; | |
4e9e7f18 SS |
912 | |
913 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 914 | if (r < 0) |
4e9e7f18 | 915 | return r; |
f66eeb6b TG |
916 | else if ((size_t)r < sizeof(struct ether_addr)) |
917 | return -EIO; | |
4e9e7f18 SS |
918 | |
919 | memcpy(data, attr_data, sizeof(struct ether_addr)); | |
920 | ||
921 | return 0; | |
922 | } | |
923 | ||
aba496a5 UTL |
924 | int sd_rtnl_message_read_cache_info(sd_rtnl_message *m, unsigned short type, struct ifa_cacheinfo *info) { |
925 | int r; | |
926 | void *attr_data; | |
927 | ||
928 | r = message_attribute_has_type(m, type, NLA_CACHE_INFO); | |
929 | if (r < 0) | |
930 | return r; | |
931 | ||
932 | r = rtnl_message_read_internal(m, type, &attr_data); | |
933 | if (r < 0) | |
934 | return r; | |
935 | else if ((size_t)r < sizeof(struct ifa_cacheinfo)) | |
936 | return -EIO; | |
937 | ||
938 | memcpy(info, attr_data, sizeof(struct ifa_cacheinfo)); | |
939 | ||
940 | return 0; | |
941 | } | |
942 | ||
4e9e7f18 SS |
943 | int sd_rtnl_message_read_in_addr(sd_rtnl_message *m, unsigned short type, struct in_addr *data) { |
944 | int r; | |
945 | void *attr_data; | |
946 | ||
d8e538ec TG |
947 | r = message_attribute_has_type(m, type, NLA_IN_ADDR); |
948 | if (r < 0) | |
949 | return r; | |
4e9e7f18 SS |
950 | |
951 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 952 | if (r < 0) |
4e9e7f18 | 953 | return r; |
f66eeb6b TG |
954 | else if ((size_t)r < sizeof(struct in_addr)) |
955 | return -EIO; | |
4e9e7f18 SS |
956 | |
957 | memcpy(data, attr_data, sizeof(struct in_addr)); | |
958 | ||
959 | return 0; | |
960 | } | |
961 | ||
962 | int sd_rtnl_message_read_in6_addr(sd_rtnl_message *m, unsigned short type, struct in6_addr *data) { | |
963 | int r; | |
964 | void *attr_data; | |
965 | ||
d8e538ec TG |
966 | r = message_attribute_has_type(m, type, NLA_IN_ADDR); |
967 | if (r < 0) | |
968 | return r; | |
4e9e7f18 SS |
969 | |
970 | r = rtnl_message_read_internal(m, type, &attr_data); | |
3dd215e0 | 971 | if (r < 0) |
4e9e7f18 | 972 | return r; |
3dd215e0 TG |
973 | else if ((size_t)r < sizeof(struct in6_addr)) |
974 | return -EIO; | |
4e9e7f18 SS |
975 | |
976 | memcpy(data, attr_data, sizeof(struct in6_addr)); | |
977 | ||
978 | return 0; | |
979 | } | |
980 | ||
3dd215e0 | 981 | int sd_rtnl_message_enter_container(sd_rtnl_message *m, unsigned short type) { |
d8e538ec TG |
982 | const NLType *nl_type; |
983 | const NLTypeSystem *type_system; | |
3dd215e0 | 984 | void *container; |
d8e538ec TG |
985 | size_t size; |
986 | int r; | |
3dd215e0 TG |
987 | |
988 | assert_return(m, -EINVAL); | |
989 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -EINVAL); | |
990 | ||
d8e538ec TG |
991 | r = type_system_get_type(m->container_type_system[m->n_containers], |
992 | &nl_type, | |
993 | type); | |
3dd215e0 TG |
994 | if (r < 0) |
995 | return r; | |
3dd215e0 | 996 | |
d8e538ec TG |
997 | if (nl_type->type == NLA_NESTED) { |
998 | r = type_system_get_type_system(m->container_type_system[m->n_containers], | |
999 | &type_system, | |
1000 | type); | |
1001 | if (r < 0) | |
1002 | return r; | |
1003 | } else if (nl_type->type == NLA_UNION) { | |
1004 | const NLTypeSystemUnion *type_system_union; | |
ca4e095a | 1005 | const char *key; |
d8e538ec TG |
1006 | |
1007 | r = type_system_get_type_system_union(m->container_type_system[m->n_containers], | |
1008 | &type_system_union, | |
1009 | type); | |
1010 | if (r < 0) | |
1011 | return r; | |
1012 | ||
1013 | r = sd_rtnl_message_read_string(m, type_system_union->match, &key); | |
1014 | if (r < 0) | |
1015 | return r; | |
1016 | ||
1017 | r = type_system_union_get_type_system(type_system_union, | |
1018 | &type_system, | |
1019 | key); | |
1020 | if (r < 0) | |
1021 | return r; | |
1022 | } else | |
1023 | return -EINVAL; | |
1024 | ||
1025 | r = rtnl_message_read_internal(m, type, &container); | |
3dd215e0 TG |
1026 | if (r < 0) |
1027 | return r; | |
d8e538ec TG |
1028 | else |
1029 | size = (size_t)r; | |
3dd215e0 | 1030 | |
d8e538ec | 1031 | m->n_containers ++; |
3dd215e0 TG |
1032 | |
1033 | r = rtnl_message_parse(m, | |
d8e538ec TG |
1034 | &m->rta_offset_tb[m->n_containers], |
1035 | &m->rta_tb_size[m->n_containers], | |
1036 | type_system->max, | |
3dd215e0 | 1037 | container, |
d8e538ec TG |
1038 | size); |
1039 | if (r < 0) { | |
1040 | m->n_containers --; | |
3dd215e0 | 1041 | return r; |
d8e538ec | 1042 | } |
3dd215e0 | 1043 | |
d8e538ec | 1044 | m->container_type_system[m->n_containers] = type_system; |
3dd215e0 TG |
1045 | |
1046 | return 0; | |
1047 | } | |
1048 | ||
e5c4350b TG |
1049 | int sd_rtnl_message_exit_container(sd_rtnl_message *m) { |
1050 | assert_return(m, -EINVAL); | |
1051 | assert_return(m->sealed, -EINVAL); | |
1052 | assert_return(m->n_containers > 0, -EINVAL); | |
1053 | ||
3dd215e0 TG |
1054 | free(m->rta_offset_tb[m->n_containers]); |
1055 | m->rta_offset_tb[m->n_containers] = NULL; | |
d8e538ec | 1056 | m->container_type_system[m->n_containers] = NULL; |
3dd215e0 | 1057 | |
e5c4350b TG |
1058 | m->n_containers --; |
1059 | ||
1060 | return 0; | |
1061 | } | |
1062 | ||
3815f36f | 1063 | uint32_t rtnl_message_get_serial(sd_rtnl_message *m) { |
65f568bb | 1064 | assert(m); |
9d0db178 | 1065 | assert(m->hdr); |
65f568bb TG |
1066 | |
1067 | return m->hdr->nlmsg_seq; | |
1068 | } | |
1069 | ||
e16bcf98 | 1070 | int sd_rtnl_message_get_errno(sd_rtnl_message *m) { |
65f568bb TG |
1071 | struct nlmsgerr *err; |
1072 | ||
e16bcf98 | 1073 | assert_return(m, -EINVAL); |
9d0db178 | 1074 | assert_return(m->hdr, -EINVAL); |
65f568bb TG |
1075 | |
1076 | if (m->hdr->nlmsg_type != NLMSG_ERROR) | |
1077 | return 0; | |
1078 | ||
1079 | err = NLMSG_DATA(m->hdr); | |
1080 | ||
1081 | return err->error; | |
1082 | } | |
1083 | ||
44caa5e7 SS |
1084 | int rtnl_message_parse(sd_rtnl_message *m, |
1085 | size_t **rta_offset_tb, | |
1086 | unsigned short *rta_tb_size, | |
1087 | int max, | |
1088 | struct rtattr *rta, | |
1089 | unsigned int rt_len) { | |
e634cd40 | 1090 | unsigned short type; |
44caa5e7 SS |
1091 | size_t *tb; |
1092 | ||
c8a7165f | 1093 | tb = new0(size_t, max + 1); |
44caa5e7 SS |
1094 | if(!tb) |
1095 | return -ENOMEM; | |
1096 | ||
c8a7165f | 1097 | *rta_tb_size = max + 1; |
44caa5e7 SS |
1098 | |
1099 | for (; RTA_OK(rta, rt_len); rta = RTA_NEXT(rta, rt_len)) { | |
0a2478a9 | 1100 | type = RTA_TYPE(rta); |
44caa5e7 | 1101 | |
aef0768e TG |
1102 | /* if the kernel is newer than the headers we used |
1103 | when building, we ignore out-of-range attributes | |
1104 | */ | |
1105 | if (type > max) | |
e634cd40 | 1106 | continue; |
e634cd40 TG |
1107 | |
1108 | if (tb[type]) | |
1109 | log_debug("rtnl: message parse - overwriting repeated attribute"); | |
1110 | ||
1111 | tb[type] = (uint8_t *) rta - (uint8_t *) m->hdr; | |
44caa5e7 SS |
1112 | } |
1113 | ||
1114 | *rta_offset_tb = tb; | |
1115 | ||
1116 | return 0; | |
1117 | } | |
1118 | ||
65f568bb TG |
1119 | /* returns the number of bytes sent, or a negative error code */ |
1120 | int socket_write_message(sd_rtnl *nl, sd_rtnl_message *m) { | |
d4bbdb77 TG |
1121 | union { |
1122 | struct sockaddr sa; | |
1123 | struct sockaddr_nl nl; | |
1124 | } addr = { | |
1125 | .nl.nl_family = AF_NETLINK, | |
1126 | }; | |
65f568bb TG |
1127 | ssize_t k; |
1128 | ||
9d0db178 TG |
1129 | assert(nl); |
1130 | assert(m); | |
1131 | assert(m->hdr); | |
65f568bb TG |
1132 | |
1133 | k = sendto(nl->fd, m->hdr, m->hdr->nlmsg_len, | |
d4bbdb77 | 1134 | 0, &addr.sa, sizeof(addr)); |
65f568bb TG |
1135 | if (k < 0) |
1136 | return (errno == EAGAIN) ? 0 : -errno; | |
1137 | ||
1138 | return k; | |
1139 | } | |
1140 | ||
66269b05 TG |
1141 | static int socket_recv_message(int fd, struct iovec *iov, uint32_t *_group, bool peek) { |
1142 | uint8_t cred_buffer[CMSG_SPACE(sizeof(struct ucred)) + | |
1143 | CMSG_SPACE(sizeof(struct nl_pktinfo))]; | |
bc078e71 | 1144 | struct msghdr msg = { |
26349add | 1145 | .msg_iov = iov, |
bc078e71 TG |
1146 | .msg_iovlen = 1, |
1147 | .msg_control = cred_buffer, | |
1148 | .msg_controllen = sizeof(cred_buffer), | |
1149 | }; | |
1150 | struct cmsghdr *cmsg; | |
66269b05 | 1151 | uint32_t group = 0; |
26349add | 1152 | bool auth = false; |
4e996881 | 1153 | int r; |
d4bbdb77 | 1154 | |
26349add TG |
1155 | assert(fd >= 0); |
1156 | assert(iov); | |
bc078e71 | 1157 | |
26349add | 1158 | r = recvmsg(fd, &msg, MSG_TRUNC | (peek ? MSG_PEEK : 0)); |
5968b1c3 | 1159 | if (r < 0) { |
bc078e71 | 1160 | /* no data */ |
5968b1c3 TG |
1161 | if (errno == ENOBUFS) |
1162 | log_debug("rtnl: kernel receive buffer overrun"); | |
1163 | ||
bc078e71 | 1164 | return (errno == EAGAIN) ? 0 : -errno; |
5968b1c3 | 1165 | } else if (r == 0) |
bc078e71 TG |
1166 | /* connection was closed by the kernel */ |
1167 | return -ECONNRESET; | |
3dd215e0 | 1168 | |
bc078e71 TG |
1169 | for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) { |
1170 | if (cmsg->cmsg_level == SOL_SOCKET && | |
1171 | cmsg->cmsg_type == SCM_CREDENTIALS && | |
1172 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) { | |
1173 | struct ucred *ucred = (void *)CMSG_DATA(cmsg); | |
1174 | ||
1175 | /* from the kernel */ | |
66269b05 | 1176 | if (ucred->uid == 0 && ucred->pid == 0) |
bc078e71 | 1177 | auth = true; |
66269b05 TG |
1178 | } else if (cmsg->cmsg_level == SOL_NETLINK && |
1179 | cmsg->cmsg_type == NETLINK_PKTINFO && | |
1180 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct nl_pktinfo))) { | |
1181 | struct nl_pktinfo *pktinfo = (void *)CMSG_DATA(cmsg); | |
1182 | ||
1183 | /* multi-cast group */ | |
1184 | group = pktinfo->group; | |
bc078e71 TG |
1185 | } |
1186 | } | |
1187 | ||
1188 | if (!auth) | |
1189 | /* not from the kernel, ignore */ | |
1190 | return 0; | |
1191 | ||
66269b05 TG |
1192 | if (group) |
1193 | *_group = group; | |
1194 | ||
26349add TG |
1195 | return r; |
1196 | } | |
1197 | ||
1198 | /* On success, the number of bytes received is returned and *ret points to the received message | |
1199 | * which has a valid header and the correct size. | |
1200 | * If nothing useful was received 0 is returned. | |
1201 | * On failure, a negative error code is returned. | |
1202 | */ | |
1203 | int socket_read_message(sd_rtnl *rtnl) { | |
1204 | _cleanup_rtnl_message_unref_ sd_rtnl_message *first = NULL; | |
1205 | struct iovec iov = {}; | |
66269b05 | 1206 | uint32_t group = 0; |
26349add TG |
1207 | bool multi_part = false, done = false; |
1208 | struct nlmsghdr *new_msg; | |
1209 | size_t len; | |
1210 | int r; | |
1211 | unsigned i = 0; | |
1212 | ||
1213 | assert(rtnl); | |
1214 | assert(rtnl->rbuffer); | |
1215 | assert(rtnl->rbuffer_allocated >= sizeof(struct nlmsghdr)); | |
1216 | ||
1217 | /* read nothing, just get the pending message size */ | |
66269b05 | 1218 | r = socket_recv_message(rtnl->fd, &iov, &group, true); |
26349add TG |
1219 | if (r <= 0) |
1220 | return r; | |
1221 | else | |
1222 | len = (size_t)r; | |
1223 | ||
1224 | /* make room for the pending message */ | |
1225 | if (!greedy_realloc((void **)&rtnl->rbuffer, | |
1226 | &rtnl->rbuffer_allocated, | |
1227 | len, sizeof(uint8_t))) | |
1228 | return -ENOMEM; | |
1229 | ||
1230 | iov.iov_base = rtnl->rbuffer; | |
1231 | iov.iov_len = rtnl->rbuffer_allocated; | |
1232 | ||
1233 | /* read the pending message */ | |
66269b05 | 1234 | r = socket_recv_message(rtnl->fd, &iov, &group, false); |
26349add TG |
1235 | if (r <= 0) |
1236 | return r; | |
1237 | else | |
1238 | len = (size_t)r; | |
1239 | ||
127dc4ea TG |
1240 | if (len > rtnl->rbuffer_allocated) |
1241 | /* message did not fit in read buffer */ | |
1242 | return -EIO; | |
1243 | ||
4e996881 TG |
1244 | if (NLMSG_OK(rtnl->rbuffer, len) && rtnl->rbuffer->nlmsg_flags & NLM_F_MULTI) { |
1245 | multi_part = true; | |
1246 | ||
1247 | for (i = 0; i < rtnl->rqueue_partial_size; i++) { | |
1248 | if (rtnl_message_get_serial(rtnl->rqueue_partial[i]) == | |
1249 | rtnl->rbuffer->nlmsg_seq) { | |
1250 | first = rtnl->rqueue_partial[i]; | |
1251 | break; | |
1252 | } | |
1253 | } | |
1254 | } | |
1255 | ||
a88f77c4 | 1256 | for (new_msg = rtnl->rbuffer; NLMSG_OK(new_msg, len); new_msg = NLMSG_NEXT(new_msg, len)) { |
1b89cf56 TG |
1257 | _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL; |
1258 | const NLType *nl_type; | |
3dd215e0 | 1259 | |
8fe65c03 | 1260 | if (!group && new_msg->nlmsg_pid != rtnl->sockaddr.nl.nl_pid) |
1b89cf56 TG |
1261 | /* not broadcast and not for us */ |
1262 | continue; | |
3dd215e0 | 1263 | |
1b89cf56 | 1264 | if (new_msg->nlmsg_type == NLMSG_NOOP) |
4e996881 | 1265 | /* silently drop noop messages */ |
1b89cf56 | 1266 | continue; |
bdd13f6b | 1267 | |
4e996881 TG |
1268 | if (new_msg->nlmsg_type == NLMSG_DONE) { |
1269 | /* finished reading multi-part message */ | |
1270 | done = true; | |
1403f45a | 1271 | break; |
4e996881 | 1272 | } |
1403f45a | 1273 | |
1b89cf56 TG |
1274 | /* check that we support this message type */ |
1275 | r = type_system_get_type(NULL, &nl_type, new_msg->nlmsg_type); | |
1276 | if (r < 0) { | |
1277 | if (r == -ENOTSUP) | |
1278 | log_debug("sd-rtnl: ignored message with unknown type: %u", | |
1279 | new_msg->nlmsg_type); | |
d8e538ec | 1280 | |
1b89cf56 TG |
1281 | continue; |
1282 | } | |
bdd13f6b | 1283 | |
1b89cf56 TG |
1284 | /* check that the size matches the message type */ |
1285 | if (new_msg->nlmsg_len < NLMSG_LENGTH(nl_type->size)) | |
1286 | continue; | |
65f568bb | 1287 | |
1b89cf56 TG |
1288 | r = message_new_empty(rtnl, &m); |
1289 | if (r < 0) | |
1290 | return r; | |
1291 | ||
1292 | m->hdr = memdup(new_msg, new_msg->nlmsg_len); | |
1293 | if (!m->hdr) | |
1294 | return -ENOMEM; | |
1295 | ||
1296 | /* seal and parse the top-level message */ | |
1297 | r = sd_rtnl_message_rewind(m); | |
1298 | if (r < 0) | |
1299 | return r; | |
1300 | ||
4e996881 TG |
1301 | /* push the message onto the multi-part message stack */ |
1302 | if (first) | |
1303 | m->next = first; | |
1304 | first = m; | |
1b89cf56 | 1305 | m = NULL; |
4e996881 | 1306 | } |
1403f45a | 1307 | |
4e996881 TG |
1308 | if (len) |
1309 | log_debug("sd-rtnl: discarding %zu bytes of incoming message", len); | |
1b89cf56 | 1310 | |
4e996881 TG |
1311 | if (!first) |
1312 | return 0; | |
65f568bb | 1313 | |
4e996881 TG |
1314 | if (!multi_part || done) { |
1315 | /* we got a complete message, push it on the read queue */ | |
24a02673 TG |
1316 | r = rtnl_rqueue_make_room(rtnl); |
1317 | if (r < 0) | |
1318 | return r; | |
1319 | ||
d4ef4f46 TG |
1320 | rtnl->rqueue[rtnl->rqueue_size ++] = first; |
1321 | first = NULL; | |
1322 | ||
1323 | if (multi_part && (i < rtnl->rqueue_partial_size)) { | |
4e996881 TG |
1324 | /* remove the message form the partial read queue */ |
1325 | memmove(rtnl->rqueue_partial + i,rtnl->rqueue_partial + i + 1, | |
1326 | sizeof(sd_rtnl_message*) * (rtnl->rqueue_partial_size - i - 1)); | |
1327 | rtnl->rqueue_partial_size --; | |
1328 | } | |
1329 | ||
4e996881 TG |
1330 | return 1; |
1331 | } else { | |
1332 | /* we only got a partial multi-part message, push it on the | |
1333 | partial read queue */ | |
1334 | if (i < rtnl->rqueue_partial_size) { | |
1335 | rtnl->rqueue_partial[i] = first; | |
1336 | } else { | |
1337 | r = rtnl_rqueue_partial_make_room(rtnl); | |
1338 | if (r < 0) | |
1339 | return r; | |
1340 | ||
1341 | rtnl->rqueue_partial[rtnl->rqueue_partial_size ++] = first; | |
1342 | } | |
1343 | first = NULL; | |
1403f45a | 1344 | |
4e996881 TG |
1345 | return 0; |
1346 | } | |
65f568bb | 1347 | } |
0fc7531b TG |
1348 | |
1349 | int sd_rtnl_message_rewind(sd_rtnl_message *m) { | |
d8e538ec | 1350 | const NLType *type; |
3dd215e0 TG |
1351 | unsigned i; |
1352 | int r; | |
0fc7531b TG |
1353 | |
1354 | assert_return(m, -EINVAL); | |
0fc7531b | 1355 | |
3dd215e0 TG |
1356 | /* don't allow appending to message once parsed */ |
1357 | if (!m->sealed) | |
1358 | rtnl_message_seal(m); | |
1359 | ||
1360 | for (i = 1; i <= m->n_containers; i++) { | |
1361 | free(m->rta_offset_tb[i]); | |
1362 | m->rta_offset_tb[i] = NULL; | |
1363 | m->rta_tb_size[i] = 0; | |
d8e538ec | 1364 | m->container_type_system[i] = NULL; |
3dd215e0 TG |
1365 | } |
1366 | ||
1367 | m->n_containers = 0; | |
1368 | ||
1369 | if (m->rta_offset_tb[0]) { | |
1370 | /* top-level attributes have already been parsed */ | |
1371 | return 0; | |
1372 | } | |
1373 | ||
d8e538ec TG |
1374 | assert(m->hdr); |
1375 | ||
1376 | r = type_system_get_type(NULL, &type, m->hdr->nlmsg_type); | |
1377 | if (r < 0) | |
1378 | return r; | |
1379 | ||
1380 | if (type->type == NLA_NESTED) { | |
1381 | const NLTypeSystem *type_system = type->type_system; | |
1382 | ||
1383 | assert(type_system); | |
1384 | ||
1385 | m->container_type_system[0] = type_system; | |
1386 | ||
1387 | r = rtnl_message_parse(m, | |
1388 | &m->rta_offset_tb[m->n_containers], | |
1389 | &m->rta_tb_size[m->n_containers], | |
1390 | type_system->max, | |
0834ff93 TG |
1391 | (struct rtattr*)((uint8_t*)NLMSG_DATA(m->hdr) + |
1392 | NLMSG_ALIGN(type->size)), | |
d8e538ec TG |
1393 | NLMSG_PAYLOAD(m->hdr, type->size)); |
1394 | if (r < 0) | |
1395 | return r; | |
0fc7531b TG |
1396 | } |
1397 | ||
1398 | return 0; | |
1399 | } | |
3dd215e0 TG |
1400 | |
1401 | void rtnl_message_seal(sd_rtnl_message *m) { | |
1402 | assert(m); | |
1403 | assert(!m->sealed); | |
1404 | ||
1405 | m->sealed = true; | |
1406 | } | |
1403f45a TG |
1407 | |
1408 | sd_rtnl_message *sd_rtnl_message_next(sd_rtnl_message *m) { | |
1409 | assert_return(m, NULL); | |
1410 | ||
1411 | return m->next; | |
1412 | } |