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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> | |
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 | ||
e9140aff LP |
146 | int sd_rtnl_message_route_get_dst_len(sd_rtnl_message *m, unsigned char *dst_len) { |
147 | struct rtmsg *rtm; | |
148 | ||
149 | assert_return(m, -EINVAL); | |
150 | assert_return(m->hdr, -EINVAL); | |
151 | assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); | |
152 | assert_return(dst_len, -EINVAL); | |
153 | ||
154 | rtm = NLMSG_DATA(m->hdr); | |
155 | ||
156 | *dst_len = rtm->rtm_dst_len; | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
a98433c0 LP |
161 | int sd_rtnl_message_route_get_src_len(sd_rtnl_message *m, unsigned char *src_len) { |
162 | struct rtmsg *rtm; | |
163 | ||
164 | assert_return(m, -EINVAL); | |
165 | assert_return(m->hdr, -EINVAL); | |
166 | assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); | |
167 | assert_return(src_len, -EINVAL); | |
168 | ||
169 | rtm = NLMSG_DATA(m->hdr); | |
170 | ||
171 | *src_len = rtm->rtm_src_len; | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
151b9b96 | 176 | int sd_rtnl_message_new_route(sd_rtnl *rtnl, sd_rtnl_message **ret, |
28cc555d DW |
177 | uint16_t nlmsg_type, int rtm_family, |
178 | unsigned char rtm_protocol) { | |
03d7e632 TG |
179 | struct rtmsg *rtm; |
180 | int r; | |
181 | ||
3815f36f | 182 | assert_return(rtnl_message_type_is_route(nlmsg_type), -EINVAL); |
722f7cc9 TG |
183 | assert_return((nlmsg_type == RTM_GETROUTE && rtm_family == AF_UNSPEC) || |
184 | rtm_family == AF_INET || rtm_family == AF_INET6, -EINVAL); | |
03d7e632 TG |
185 | assert_return(ret, -EINVAL); |
186 | ||
d8e538ec | 187 | r = message_new(rtnl, ret, nlmsg_type); |
03d7e632 TG |
188 | if (r < 0) |
189 | return r; | |
190 | ||
03d7e632 | 191 | if (nlmsg_type == RTM_NEWROUTE) |
3f781aa8 | 192 | (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_APPEND; |
03d7e632 TG |
193 | |
194 | rtm = NLMSG_DATA((*ret)->hdr); | |
195 | ||
196 | rtm->rtm_family = rtm_family; | |
1f01fb4f TG |
197 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; |
198 | rtm->rtm_type = RTN_UNICAST; | |
199 | rtm->rtm_table = RT_TABLE_MAIN; | |
28cc555d | 200 | rtm->rtm_protocol = rtm_protocol; |
03d7e632 TG |
201 | |
202 | return 0; | |
203 | } | |
204 | ||
20dff6c4 TG |
205 | int sd_rtnl_message_neigh_get_family(sd_rtnl_message *m, int *family) { |
206 | struct ndmsg *ndm; | |
207 | ||
208 | assert_return(m, -EINVAL); | |
209 | assert_return(m->hdr, -EINVAL); | |
210 | assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); | |
211 | assert_return(family, -EINVAL); | |
212 | ||
213 | ndm = NLMSG_DATA(m->hdr); | |
214 | ||
215 | *family = ndm->ndm_family; | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
220 | int sd_rtnl_message_neigh_get_ifindex(sd_rtnl_message *m, int *index) { | |
221 | struct ndmsg *ndm; | |
222 | ||
223 | assert_return(m, -EINVAL); | |
224 | assert_return(m->hdr, -EINVAL); | |
225 | assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); | |
226 | assert_return(index, -EINVAL); | |
227 | ||
228 | ndm = NLMSG_DATA(m->hdr); | |
229 | ||
230 | *index = ndm->ndm_ifindex; | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | int sd_rtnl_message_new_neigh(sd_rtnl *rtnl, sd_rtnl_message **ret, uint16_t nlmsg_type, int index, int ndm_family) { | |
236 | struct ndmsg *ndm; | |
237 | int r; | |
238 | ||
239 | assert_return(rtnl_message_type_is_neigh(nlmsg_type), -EINVAL); | |
240 | assert_return(ndm_family == AF_INET || ndm_family == AF_INET6, -EINVAL); | |
241 | assert_return(ret, -EINVAL); | |
242 | ||
243 | r = message_new(rtnl, ret, nlmsg_type); | |
244 | if (r < 0) | |
245 | return r; | |
246 | ||
247 | if (nlmsg_type == RTM_NEWNEIGH) | |
248 | (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_APPEND; | |
249 | ||
250 | ndm = NLMSG_DATA((*ret)->hdr); | |
251 | ||
252 | ndm->ndm_family = ndm_family; | |
253 | ndm->ndm_ifindex = index; | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
5d4795f3 | 258 | int sd_rtnl_message_link_set_flags(sd_rtnl_message *m, unsigned flags, unsigned change) { |
fc25d7f8 TG |
259 | struct ifinfomsg *ifi; |
260 | ||
5a723174 TG |
261 | assert_return(m, -EINVAL); |
262 | assert_return(m->hdr, -EINVAL); | |
3815f36f | 263 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); |
a7b74db6 | 264 | assert_return(change, -EINVAL); |
5a723174 | 265 | |
fc25d7f8 TG |
266 | ifi = NLMSG_DATA(m->hdr); |
267 | ||
268 | ifi->ifi_flags = flags; | |
a7b74db6 | 269 | ifi->ifi_change = change; |
fc25d7f8 TG |
270 | |
271 | return 0; | |
272 | } | |
273 | ||
274 | int sd_rtnl_message_link_set_type(sd_rtnl_message *m, unsigned type) { | |
275 | struct ifinfomsg *ifi; | |
276 | ||
5a723174 TG |
277 | assert_return(m, -EINVAL); |
278 | assert_return(m->hdr, -EINVAL); | |
3815f36f | 279 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); |
5a723174 | 280 | |
fc25d7f8 TG |
281 | ifi = NLMSG_DATA(m->hdr); |
282 | ||
283 | ifi->ifi_type = type; | |
284 | ||
285 | return 0; | |
286 | } | |
287 | ||
64c84071 SS |
288 | int sd_rtnl_message_link_set_family(sd_rtnl_message *m, unsigned family) { |
289 | struct ifinfomsg *ifi; | |
290 | ||
291 | assert_return(m, -EINVAL); | |
292 | assert_return(m->hdr, -EINVAL); | |
293 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); | |
294 | ||
295 | ifi = NLMSG_DATA(m->hdr); | |
296 | ||
297 | ifi->ifi_family = family; | |
298 | ||
299 | return 0; | |
300 | } | |
301 | ||
151b9b96 LP |
302 | int sd_rtnl_message_new_link(sd_rtnl *rtnl, sd_rtnl_message **ret, |
303 | uint16_t nlmsg_type, int index) { | |
65f568bb TG |
304 | struct ifinfomsg *ifi; |
305 | int r; | |
306 | ||
3815f36f | 307 | assert_return(rtnl_message_type_is_link(nlmsg_type), -EINVAL); |
6a8402d9 | 308 | assert_return(nlmsg_type != RTM_DELLINK || index > 0, -EINVAL); |
65f568bb TG |
309 | assert_return(ret, -EINVAL); |
310 | ||
d8e538ec | 311 | r = message_new(rtnl, ret, nlmsg_type); |
65f568bb TG |
312 | if (r < 0) |
313 | return r; | |
314 | ||
33125ac5 | 315 | if (nlmsg_type == RTM_NEWLINK) |
6a8402d9 | 316 | (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL; |
65f568bb | 317 | |
dabfa9d1 | 318 | ifi = NLMSG_DATA((*ret)->hdr); |
65f568bb TG |
319 | |
320 | ifi->ifi_family = AF_UNSPEC; | |
321 | ifi->ifi_index = index; | |
65f568bb TG |
322 | |
323 | return 0; | |
324 | } | |
325 | ||
6e20c8f8 TG |
326 | int sd_rtnl_message_request_dump(sd_rtnl_message *m, int dump) { |
327 | assert_return(m, -EINVAL); | |
328 | assert_return(m->hdr, -EINVAL); | |
20dff6c4 TG |
329 | assert_return(m->hdr->nlmsg_type == RTM_GETLINK || |
330 | m->hdr->nlmsg_type == RTM_GETADDR || | |
331 | m->hdr->nlmsg_type == RTM_GETROUTE || | |
332 | m->hdr->nlmsg_type == RTM_GETNEIGH, | |
6e20c8f8 TG |
333 | -EINVAL); |
334 | ||
335 | if (dump) | |
336 | m->hdr->nlmsg_flags |= NLM_F_DUMP; | |
337 | else | |
338 | m->hdr->nlmsg_flags &= ~NLM_F_DUMP; | |
339 | ||
340 | return 0; | |
341 | } | |
342 | ||
5a723174 TG |
343 | int sd_rtnl_message_addr_set_prefixlen(sd_rtnl_message *m, unsigned char prefixlen) { |
344 | struct ifaddrmsg *ifa; | |
345 | ||
346 | assert_return(m, -EINVAL); | |
347 | assert_return(m->hdr, -EINVAL); | |
3815f36f | 348 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); |
5a723174 TG |
349 | |
350 | ifa = NLMSG_DATA(m->hdr); | |
351 | ||
352 | if ((ifa->ifa_family == AF_INET && prefixlen > 32) || | |
353 | (ifa->ifa_family == AF_INET6 && prefixlen > 128)) | |
354 | return -ERANGE; | |
355 | ||
356 | ifa->ifa_prefixlen = prefixlen; | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
361 | int sd_rtnl_message_addr_set_flags(sd_rtnl_message *m, unsigned char flags) { | |
362 | struct ifaddrmsg *ifa; | |
363 | ||
364 | assert_return(m, -EINVAL); | |
365 | assert_return(m->hdr, -EINVAL); | |
3815f36f | 366 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); |
5a723174 TG |
367 | |
368 | ifa = NLMSG_DATA(m->hdr); | |
369 | ||
370 | ifa->ifa_flags = flags; | |
371 | ||
372 | return 0; | |
373 | } | |
374 | ||
375 | int sd_rtnl_message_addr_set_scope(sd_rtnl_message *m, unsigned char scope) { | |
376 | struct ifaddrmsg *ifa; | |
377 | ||
378 | assert_return(m, -EINVAL); | |
379 | assert_return(m->hdr, -EINVAL); | |
3815f36f | 380 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); |
5a723174 TG |
381 | |
382 | ifa = NLMSG_DATA(m->hdr); | |
383 | ||
384 | ifa->ifa_scope = scope; | |
385 | ||
386 | return 0; | |
387 | } | |
388 | ||
0dd25fb9 | 389 | int sd_rtnl_message_addr_get_family(sd_rtnl_message *m, int *family) { |
e00d77dd TG |
390 | struct ifaddrmsg *ifa; |
391 | ||
392 | assert_return(m, -EINVAL); | |
393 | assert_return(m->hdr, -EINVAL); | |
394 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
395 | assert_return(family, -EINVAL); | |
396 | ||
397 | ifa = NLMSG_DATA(m->hdr); | |
398 | ||
399 | *family = ifa->ifa_family; | |
400 | ||
401 | return 0; | |
402 | } | |
403 | ||
f4e884dd TG |
404 | int sd_rtnl_message_addr_get_prefixlen(sd_rtnl_message *m, unsigned char *prefixlen) { |
405 | struct ifaddrmsg *ifa; | |
406 | ||
407 | assert_return(m, -EINVAL); | |
408 | assert_return(m->hdr, -EINVAL); | |
409 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
410 | assert_return(prefixlen, -EINVAL); | |
411 | ||
412 | ifa = NLMSG_DATA(m->hdr); | |
413 | ||
414 | *prefixlen = ifa->ifa_prefixlen; | |
415 | ||
416 | return 0; | |
417 | } | |
418 | ||
e00d77dd TG |
419 | int sd_rtnl_message_addr_get_scope(sd_rtnl_message *m, unsigned char *scope) { |
420 | struct ifaddrmsg *ifa; | |
421 | ||
422 | assert_return(m, -EINVAL); | |
423 | assert_return(m->hdr, -EINVAL); | |
424 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
425 | assert_return(scope, -EINVAL); | |
426 | ||
427 | ifa = NLMSG_DATA(m->hdr); | |
428 | ||
429 | *scope = ifa->ifa_scope; | |
430 | ||
431 | return 0; | |
432 | } | |
433 | ||
434 | int sd_rtnl_message_addr_get_flags(sd_rtnl_message *m, unsigned char *flags) { | |
435 | struct ifaddrmsg *ifa; | |
436 | ||
437 | assert_return(m, -EINVAL); | |
438 | assert_return(m->hdr, -EINVAL); | |
439 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
440 | assert_return(flags, -EINVAL); | |
441 | ||
442 | ifa = NLMSG_DATA(m->hdr); | |
443 | ||
444 | *flags = ifa->ifa_flags; | |
445 | ||
446 | return 0; | |
447 | } | |
448 | ||
449 | int sd_rtnl_message_addr_get_ifindex(sd_rtnl_message *m, int *ifindex) { | |
450 | struct ifaddrmsg *ifa; | |
451 | ||
452 | assert_return(m, -EINVAL); | |
453 | assert_return(m->hdr, -EINVAL); | |
454 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
455 | assert_return(ifindex, -EINVAL); | |
456 | ||
457 | ifa = NLMSG_DATA(m->hdr); | |
458 | ||
459 | *ifindex = ifa->ifa_index; | |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
151b9b96 LP |
464 | int sd_rtnl_message_new_addr(sd_rtnl *rtnl, sd_rtnl_message **ret, |
465 | uint16_t nlmsg_type, int index, | |
0dd25fb9 | 466 | int family) { |
65f568bb TG |
467 | struct ifaddrmsg *ifa; |
468 | int r; | |
469 | ||
3815f36f | 470 | assert_return(rtnl_message_type_is_addr(nlmsg_type), -EINVAL); |
b9ef681b TG |
471 | assert_return((nlmsg_type == RTM_GETADDR && index == 0) || |
472 | index > 0, -EINVAL); | |
473 | assert_return((nlmsg_type == RTM_GETADDR && family == AF_UNSPEC) || | |
474 | family == AF_INET || family == AF_INET6, -EINVAL); | |
65f568bb TG |
475 | assert_return(ret, -EINVAL); |
476 | ||
d8e538ec | 477 | r = message_new(rtnl, ret, nlmsg_type); |
65f568bb TG |
478 | if (r < 0) |
479 | return r; | |
480 | ||
b9ef681b | 481 | if (nlmsg_type == RTM_GETADDR) |
818dc5e7 | 482 | (*ret)->hdr->nlmsg_flags |= NLM_F_DUMP; |
65f568bb | 483 | |
dabfa9d1 | 484 | ifa = NLMSG_DATA((*ret)->hdr); |
65f568bb | 485 | |
65f568bb | 486 | ifa->ifa_index = index; |
5a723174 TG |
487 | ifa->ifa_family = family; |
488 | if (family == AF_INET) | |
489 | ifa->ifa_prefixlen = 32; | |
490 | else if (family == AF_INET6) | |
491 | ifa->ifa_prefixlen = 128; | |
65f568bb TG |
492 | |
493 | return 0; | |
494 | } | |
495 | ||
aba496a5 | 496 | int sd_rtnl_message_new_addr_update(sd_rtnl *rtnl, sd_rtnl_message **ret, |
0dd25fb9 | 497 | int index, int family) { |
aba496a5 UTL |
498 | int r; |
499 | ||
500 | r = sd_rtnl_message_new_addr(rtnl, ret, RTM_NEWADDR, index, family); | |
501 | if (r < 0) | |
502 | return r; | |
503 | ||
504 | (*ret)->hdr->nlmsg_flags |= NLM_F_REPLACE; | |
505 | ||
506 | return 0; | |
507 | } | |
508 | ||
65f568bb TG |
509 | sd_rtnl_message *sd_rtnl_message_ref(sd_rtnl_message *m) { |
510 | if (m) | |
511 | assert_se(REFCNT_INC(m->n_ref) >= 2); | |
512 | ||
513 | return m; | |
514 | } | |
515 | ||
516 | sd_rtnl_message *sd_rtnl_message_unref(sd_rtnl_message *m) { | |
517 | if (m && REFCNT_DEC(m->n_ref) <= 0) { | |
3dd215e0 TG |
518 | unsigned i; |
519 | ||
65f568bb | 520 | free(m->hdr); |
3dd215e0 | 521 | |
9f5bbfe3 | 522 | for (i = 0; i <= m->n_containers; i++) |
3dd215e0 TG |
523 | free(m->rta_offset_tb[i]); |
524 | ||
1403f45a TG |
525 | sd_rtnl_message_unref(m->next); |
526 | ||
65f568bb TG |
527 | free(m); |
528 | } | |
529 | ||
530 | return NULL; | |
531 | } | |
532 | ||
dabfa9d1 | 533 | int sd_rtnl_message_get_type(sd_rtnl_message *m, uint16_t *type) { |
65f568bb TG |
534 | assert_return(m, -EINVAL); |
535 | assert_return(type, -EINVAL); | |
536 | ||
537 | *type = m->hdr->nlmsg_type; | |
538 | ||
539 | return 0; | |
540 | } | |
541 | ||
1f0db3ed TG |
542 | int sd_rtnl_message_is_broadcast(sd_rtnl_message *m) { |
543 | assert_return(m, -EINVAL); | |
544 | ||
545 | return !m->hdr->nlmsg_pid; | |
546 | } | |
547 | ||
33125ac5 TG |
548 | int sd_rtnl_message_link_get_ifindex(sd_rtnl_message *m, int *ifindex) { |
549 | struct ifinfomsg *ifi; | |
550 | ||
551 | assert_return(m, -EINVAL); | |
9d0db178 | 552 | assert_return(m->hdr, -EINVAL); |
3815f36f | 553 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); |
33125ac5 | 554 | assert_return(ifindex, -EINVAL); |
33125ac5 TG |
555 | |
556 | ifi = NLMSG_DATA(m->hdr); | |
557 | ||
558 | *ifindex = ifi->ifi_index; | |
559 | ||
560 | return 0; | |
561 | } | |
562 | ||
50b3c42f TG |
563 | int sd_rtnl_message_link_get_flags(sd_rtnl_message *m, unsigned *flags) { |
564 | struct ifinfomsg *ifi; | |
565 | ||
566 | assert_return(m, -EINVAL); | |
9d0db178 | 567 | assert_return(m->hdr, -EINVAL); |
3815f36f | 568 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); |
50b3c42f | 569 | assert_return(flags, -EINVAL); |
50b3c42f TG |
570 | |
571 | ifi = NLMSG_DATA(m->hdr); | |
572 | ||
573 | *flags = ifi->ifi_flags; | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
ee8c4568 LP |
578 | int sd_rtnl_message_link_get_type(sd_rtnl_message *m, unsigned *type) { |
579 | struct ifinfomsg *ifi; | |
580 | ||
581 | assert_return(m, -EINVAL); | |
582 | assert_return(m->hdr, -EINVAL); | |
583 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); | |
584 | assert_return(type, -EINVAL); | |
585 | ||
586 | ifi = NLMSG_DATA(m->hdr); | |
587 | ||
588 | *type = ifi->ifi_type; | |
589 | ||
590 | return 0; | |
591 | } | |
592 | ||
4ebe732c ZJS |
593 | /* If successful the updated message will be correctly aligned, if |
594 | unsuccessful the old message is untouched. */ | |
65f568bb | 595 | static int add_rtattr(sd_rtnl_message *m, unsigned short type, const void *data, size_t data_length) { |
7ca1d319 TG |
596 | uint32_t rta_length; |
597 | size_t message_length, padding_length; | |
65f568bb TG |
598 | struct nlmsghdr *new_hdr; |
599 | struct rtattr *rta; | |
8e337e64 | 600 | char *padding; |
5a081409 | 601 | unsigned i; |
7ca1d319 | 602 | int offset; |
65f568bb | 603 | |
33125ac5 TG |
604 | assert(m); |
605 | assert(m->hdr); | |
e5c4350b | 606 | assert(!m->sealed); |
33125ac5 | 607 | assert(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len); |
7ca1d319 TG |
608 | assert(!data || data_length); |
609 | ||
610 | /* get offset of the new attribute */ | |
611 | offset = m->hdr->nlmsg_len; | |
65f568bb | 612 | |
8e337e64 | 613 | /* get the size of the new rta attribute (with padding at the end) */ |
65f568bb | 614 | rta_length = RTA_LENGTH(data_length); |
4ebe732c ZJS |
615 | |
616 | /* get the new message size (with padding at the end) */ | |
7ca1d319 | 617 | message_length = offset + RTA_ALIGN(rta_length); |
65f568bb TG |
618 | |
619 | /* realloc to fit the new attribute */ | |
620 | new_hdr = realloc(m->hdr, message_length); | |
621 | if (!new_hdr) | |
622 | return -ENOMEM; | |
623 | m->hdr = new_hdr; | |
624 | ||
625 | /* get pointer to the attribute we are about to add */ | |
7ca1d319 | 626 | rta = (struct rtattr *) ((uint8_t *) m->hdr + offset); |
65f568bb | 627 | |
5a081409 TG |
628 | /* if we are inside containers, extend them */ |
629 | for (i = 0; i < m->n_containers; i++) | |
7ca1d319 | 630 | GET_CONTAINER(m, i)->rta_len += message_length - offset; |
33125ac5 | 631 | |
65f568bb TG |
632 | /* fill in the attribute */ |
633 | rta->rta_type = type; | |
634 | rta->rta_len = rta_length; | |
7ca1d319 | 635 | if (data) |
33125ac5 TG |
636 | /* we don't deal with the case where the user lies about the type |
637 | * and gives us too little data (so don't do that) | |
7ca1d319 | 638 | */ |
33125ac5 | 639 | padding = mempcpy(RTA_DATA(rta), data, data_length); |
7ca1d319 TG |
640 | else { |
641 | /* if no data was passed, make sure we still initialize the padding | |
642 | note that we can have data_length > 0 (used by some containers) */ | |
643 | padding = RTA_DATA(rta); | |
33125ac5 | 644 | } |
65f568bb | 645 | |
7ca1d319 TG |
646 | /* make sure also the padding at the end of the message is initialized */ |
647 | padding_length = (uint8_t*)m->hdr + message_length - (uint8_t*)padding; | |
648 | memzero(padding, padding_length); | |
649 | ||
4ebe732c ZJS |
650 | /* update message size */ |
651 | m->hdr->nlmsg_len = message_length; | |
652 | ||
7ca1d319 | 653 | return offset; |
65f568bb TG |
654 | } |
655 | ||
d8e538ec TG |
656 | static int message_attribute_has_type(sd_rtnl_message *m, uint16_t attribute_type, uint16_t data_type) { |
657 | const NLType *type; | |
658 | int r; | |
659 | ||
660 | r = type_system_get_type(m->container_type_system[m->n_containers], &type, attribute_type); | |
661 | if (r < 0) | |
662 | return r; | |
663 | ||
664 | if (type->type != data_type) | |
665 | return -EINVAL; | |
666 | ||
667 | return type->size; | |
668 | } | |
669 | ||
0a0dc69b | 670 | int sd_rtnl_message_append_string(sd_rtnl_message *m, unsigned short type, const char *data) { |
d8e538ec | 671 | size_t length, size; |
0a0dc69b | 672 | int r; |
65f568bb TG |
673 | |
674 | assert_return(m, -EINVAL); | |
e5c4350b | 675 | assert_return(!m->sealed, -EPERM); |
65f568bb TG |
676 | assert_return(data, -EINVAL); |
677 | ||
d8e538ec | 678 | r = message_attribute_has_type(m, type, NLA_STRING); |
0a0dc69b TG |
679 | if (r < 0) |
680 | return r; | |
d8e538ec TG |
681 | else |
682 | size = (size_t)r; | |
65f568bb | 683 | |
d8e538ec TG |
684 | if (size) { |
685 | length = strnlen(data, size); | |
686 | if (length >= size) | |
687 | return -EINVAL; | |
688 | } else | |
689 | length = strlen(data); | |
33125ac5 | 690 | |
d8e538ec | 691 | r = add_rtattr(m, type, data, length + 1); |
0a0dc69b TG |
692 | if (r < 0) |
693 | return r; | |
694 | ||
695 | return 0; | |
696 | } | |
697 | ||
7b179640 | 698 | int sd_rtnl_message_append_u8(sd_rtnl_message *m, unsigned short type, uint8_t data) { |
7b179640 SS |
699 | int r; |
700 | ||
701 | assert_return(m, -EINVAL); | |
702 | assert_return(!m->sealed, -EPERM); | |
703 | ||
d8e538ec | 704 | r = message_attribute_has_type(m, type, NLA_U8); |
7b179640 SS |
705 | if (r < 0) |
706 | return r; | |
707 | ||
7b179640 SS |
708 | r = add_rtattr(m, type, &data, sizeof(uint8_t)); |
709 | if (r < 0) | |
710 | return r; | |
711 | ||
712 | return 0; | |
713 | } | |
714 | ||
715 | ||
01b36069 | 716 | int sd_rtnl_message_append_u16(sd_rtnl_message *m, unsigned short type, uint16_t data) { |
01b36069 TG |
717 | int r; |
718 | ||
719 | assert_return(m, -EINVAL); | |
e5c4350b | 720 | assert_return(!m->sealed, -EPERM); |
01b36069 | 721 | |
d8e538ec | 722 | r = message_attribute_has_type(m, type, NLA_U16); |
01b36069 TG |
723 | if (r < 0) |
724 | return r; | |
725 | ||
01b36069 TG |
726 | r = add_rtattr(m, type, &data, sizeof(uint16_t)); |
727 | if (r < 0) | |
728 | return r; | |
729 | ||
730 | return 0; | |
731 | } | |
732 | ||
0a0dc69b | 733 | int sd_rtnl_message_append_u32(sd_rtnl_message *m, unsigned short type, uint32_t data) { |
0a0dc69b TG |
734 | int r; |
735 | ||
736 | assert_return(m, -EINVAL); | |
e5c4350b | 737 | assert_return(!m->sealed, -EPERM); |
0a0dc69b | 738 | |
d8e538ec | 739 | r = message_attribute_has_type(m, type, NLA_U32); |
0a0dc69b TG |
740 | if (r < 0) |
741 | return r; | |
742 | ||
4d47756b | 743 | r = add_rtattr(m, type, &data, sizeof(uint32_t)); |
0a0dc69b TG |
744 | if (r < 0) |
745 | return r; | |
746 | ||
747 | return 0; | |
748 | } | |
749 | ||
750 | int sd_rtnl_message_append_in_addr(sd_rtnl_message *m, unsigned short type, const struct in_addr *data) { | |
0a0dc69b TG |
751 | int r; |
752 | ||
753 | assert_return(m, -EINVAL); | |
e5c4350b | 754 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
755 | assert_return(data, -EINVAL); |
756 | ||
d8e538ec | 757 | r = message_attribute_has_type(m, type, NLA_IN_ADDR); |
0a0dc69b TG |
758 | if (r < 0) |
759 | return r; | |
760 | ||
4d47756b | 761 | r = add_rtattr(m, type, data, sizeof(struct in_addr)); |
0a0dc69b TG |
762 | if (r < 0) |
763 | return r; | |
764 | ||
765 | return 0; | |
766 | } | |
767 | ||
768 | int sd_rtnl_message_append_in6_addr(sd_rtnl_message *m, unsigned short type, const struct in6_addr *data) { | |
0a0dc69b TG |
769 | int r; |
770 | ||
771 | assert_return(m, -EINVAL); | |
e5c4350b | 772 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
773 | assert_return(data, -EINVAL); |
774 | ||
d8e538ec | 775 | r = message_attribute_has_type(m, type, NLA_IN_ADDR); |
0a0dc69b TG |
776 | if (r < 0) |
777 | return r; | |
778 | ||
4d47756b | 779 | r = add_rtattr(m, type, data, sizeof(struct in6_addr)); |
0a0dc69b TG |
780 | if (r < 0) |
781 | return r; | |
782 | ||
783 | return 0; | |
784 | } | |
785 | ||
786 | int sd_rtnl_message_append_ether_addr(sd_rtnl_message *m, unsigned short type, const struct ether_addr *data) { | |
0a0dc69b TG |
787 | int r; |
788 | ||
789 | assert_return(m, -EINVAL); | |
e5c4350b | 790 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
791 | assert_return(data, -EINVAL); |
792 | ||
d8e538ec TG |
793 | r = message_attribute_has_type(m, type, NLA_ETHER_ADDR); |
794 | if (r < 0) | |
795 | return r; | |
0a0dc69b | 796 | |
b9eaf3d1 | 797 | r = add_rtattr(m, type, data, ETH_ALEN); |
0a0dc69b TG |
798 | if (r < 0) |
799 | return r; | |
800 | ||
801 | return 0; | |
65f568bb TG |
802 | } |
803 | ||
aba496a5 UTL |
804 | int sd_rtnl_message_append_cache_info(sd_rtnl_message *m, unsigned short type, const struct ifa_cacheinfo *info) { |
805 | int r; | |
806 | ||
807 | assert_return(m, -EINVAL); | |
808 | assert_return(!m->sealed, -EPERM); | |
809 | assert_return(info, -EINVAL); | |
810 | ||
811 | r = message_attribute_has_type(m, type, NLA_CACHE_INFO); | |
812 | if (r < 0) | |
813 | return r; | |
814 | ||
815 | r = add_rtattr(m, type, info, sizeof(struct ifa_cacheinfo)); | |
816 | if (r < 0) | |
817 | return r; | |
818 | ||
819 | return 0; | |
820 | } | |
821 | ||
ee3a6a51 | 822 | int sd_rtnl_message_open_container(sd_rtnl_message *m, unsigned short type) { |
d8e538ec TG |
823 | size_t size; |
824 | int r; | |
33125ac5 | 825 | |
65f568bb | 826 | assert_return(m, -EINVAL); |
e5c4350b | 827 | assert_return(!m->sealed, -EPERM); |
7ca1d319 | 828 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -ERANGE); |
33125ac5 | 829 | |
d8e538ec TG |
830 | r = message_attribute_has_type(m, type, NLA_NESTED); |
831 | if (r < 0) | |
832 | return r; | |
833 | else | |
834 | size = (size_t)r; | |
33125ac5 | 835 | |
d8e538ec TG |
836 | r = type_system_get_type_system(m->container_type_system[m->n_containers], |
837 | &m->container_type_system[m->n_containers + 1], | |
838 | type); | |
839 | if (r < 0) | |
840 | return r; | |
31a4e153 | 841 | |
fcf81a54 | 842 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, size); |
d8e538ec TG |
843 | if (r < 0) |
844 | return r; | |
845 | ||
7ca1d319 TG |
846 | m->container_offsets[m->n_containers ++] = r; |
847 | ||
d8e538ec TG |
848 | return 0; |
849 | } | |
850 | ||
851 | int sd_rtnl_message_open_container_union(sd_rtnl_message *m, unsigned short type, const char *key) { | |
852 | const NLTypeSystemUnion *type_system_union; | |
853 | int r; | |
854 | ||
855 | assert_return(m, -EINVAL); | |
856 | assert_return(!m->sealed, -EPERM); | |
857 | ||
858 | r = type_system_get_type_system_union(m->container_type_system[m->n_containers], &type_system_union, type); | |
859 | if (r < 0) | |
860 | return r; | |
861 | ||
862 | r = type_system_union_get_type_system(type_system_union, | |
863 | &m->container_type_system[m->n_containers + 1], | |
864 | key); | |
865 | if (r < 0) | |
866 | return r; | |
33125ac5 | 867 | |
d8e538ec TG |
868 | r = sd_rtnl_message_append_string(m, type_system_union->match, key); |
869 | if (r < 0) | |
870 | return r; | |
871 | ||
872 | /* do we evere need non-null size */ | |
873 | r = add_rtattr(m, type, NULL, 0); | |
874 | if (r < 0) | |
875 | return r; | |
876 | ||
7ca1d319 TG |
877 | m->container_offsets[m->n_containers ++] = r; |
878 | ||
d8e538ec | 879 | return 0; |
33125ac5 TG |
880 | } |
881 | ||
d8e538ec | 882 | |
33125ac5 TG |
883 | int sd_rtnl_message_close_container(sd_rtnl_message *m) { |
884 | assert_return(m, -EINVAL); | |
e5c4350b | 885 | assert_return(!m->sealed, -EPERM); |
5a081409 | 886 | assert_return(m->n_containers > 0, -EINVAL); |
33125ac5 | 887 | |
d8e538ec | 888 | m->container_type_system[m->n_containers] = NULL; |
5a081409 | 889 | m->n_containers --; |
33125ac5 TG |
890 | |
891 | return 0; | |
892 | } | |
893 | ||
44caa5e7 | 894 | int rtnl_message_read_internal(sd_rtnl_message *m, unsigned short type, void **data) { |
f66eeb6b TG |
895 | struct rtattr *rta; |
896 | ||
44caa5e7 SS |
897 | assert_return(m, -EINVAL); |
898 | assert_return(m->sealed, -EPERM); | |
899 | assert_return(data, -EINVAL); | |
d8e538ec TG |
900 | assert(m->n_containers <= RTNL_CONTAINER_DEPTH); |
901 | assert(m->rta_offset_tb[m->n_containers]); | |
902 | assert(type < m->rta_tb_size[m->n_containers]); | |
44caa5e7 | 903 | |
3dd215e0 | 904 | if(!m->rta_offset_tb[m->n_containers][type]) |
44caa5e7 SS |
905 | return -ENODATA; |
906 | ||
3dd215e0 | 907 | rta = (struct rtattr*)((uint8_t *) m->hdr + m->rta_offset_tb[m->n_containers][type]); |
44caa5e7 | 908 | |
f66eeb6b TG |
909 | *data = RTA_DATA(rta); |
910 | ||
911 | return RTA_PAYLOAD(rta); | |
44caa5e7 SS |
912 | } |
913 | ||
ca4e095a | 914 | int sd_rtnl_message_read_string(sd_rtnl_message *m, unsigned short type, const char **data) { |
44caa5e7 SS |
915 | int r; |
916 | void *attr_data; | |
917 | ||
73ae2b7d TG |
918 | assert_return(m, -EINVAL); |
919 | ||
d8e538ec TG |
920 | r = message_attribute_has_type(m, type, NLA_STRING); |
921 | if (r < 0) | |
922 | return r; | |
44caa5e7 SS |
923 | |
924 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 925 | if (r < 0) |
44caa5e7 | 926 | return r; |
f66eeb6b TG |
927 | else if (strnlen(attr_data, r) >= (size_t) r) |
928 | return -EIO; | |
44caa5e7 | 929 | |
73ae2b7d TG |
930 | if (data) |
931 | *data = (const char *) attr_data; | |
44caa5e7 SS |
932 | |
933 | return 0; | |
934 | } | |
935 | ||
936 | int sd_rtnl_message_read_u8(sd_rtnl_message *m, unsigned short type, uint8_t *data) { | |
937 | int r; | |
938 | void *attr_data; | |
939 | ||
73ae2b7d TG |
940 | assert_return(m, -EINVAL); |
941 | ||
d8e538ec TG |
942 | r = message_attribute_has_type(m, type, NLA_U8); |
943 | if (r < 0) | |
944 | return r; | |
44caa5e7 SS |
945 | |
946 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 947 | if (r < 0) |
44caa5e7 | 948 | return r; |
f66eeb6b TG |
949 | else if ((size_t) r < sizeof(uint8_t)) |
950 | return -EIO; | |
44caa5e7 | 951 | |
73ae2b7d TG |
952 | if (data) |
953 | *data = *(uint8_t *) attr_data; | |
44caa5e7 SS |
954 | |
955 | return 0; | |
956 | } | |
957 | ||
958 | int sd_rtnl_message_read_u16(sd_rtnl_message *m, unsigned short type, uint16_t *data) { | |
959 | int r; | |
960 | void *attr_data; | |
961 | ||
73ae2b7d TG |
962 | assert_return(m, -EINVAL); |
963 | ||
d8e538ec TG |
964 | r = message_attribute_has_type(m, type, NLA_U16); |
965 | if (r < 0) | |
966 | return r; | |
44caa5e7 SS |
967 | |
968 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 969 | if (r < 0) |
44caa5e7 | 970 | return r; |
f66eeb6b TG |
971 | else if ((size_t) r < sizeof(uint16_t)) |
972 | return -EIO; | |
44caa5e7 | 973 | |
73ae2b7d TG |
974 | if (data) |
975 | *data = *(uint16_t *) attr_data; | |
44caa5e7 SS |
976 | |
977 | return 0; | |
978 | } | |
979 | ||
980 | int sd_rtnl_message_read_u32(sd_rtnl_message *m, unsigned short type, uint32_t *data) { | |
981 | int r; | |
982 | void *attr_data; | |
983 | ||
73ae2b7d TG |
984 | assert_return(m, -EINVAL); |
985 | ||
d8e538ec TG |
986 | r = message_attribute_has_type(m, type, NLA_U32); |
987 | if (r < 0) | |
988 | return r; | |
44caa5e7 SS |
989 | |
990 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 991 | if (r < 0) |
44caa5e7 | 992 | return r; |
f66eeb6b TG |
993 | else if ((size_t)r < sizeof(uint32_t)) |
994 | return -EIO; | |
44caa5e7 | 995 | |
73ae2b7d TG |
996 | if (data) |
997 | *data = *(uint32_t *) attr_data; | |
44caa5e7 SS |
998 | |
999 | return 0; | |
1000 | } | |
1001 | ||
4e9e7f18 SS |
1002 | int sd_rtnl_message_read_ether_addr(sd_rtnl_message *m, unsigned short type, struct ether_addr *data) { |
1003 | int r; | |
1004 | void *attr_data; | |
1005 | ||
73ae2b7d TG |
1006 | assert_return(m, -EINVAL); |
1007 | ||
d8e538ec TG |
1008 | r = message_attribute_has_type(m, type, NLA_ETHER_ADDR); |
1009 | if (r < 0) | |
1010 | return r; | |
4e9e7f18 SS |
1011 | |
1012 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 1013 | if (r < 0) |
4e9e7f18 | 1014 | return r; |
f66eeb6b TG |
1015 | else if ((size_t)r < sizeof(struct ether_addr)) |
1016 | return -EIO; | |
4e9e7f18 | 1017 | |
73ae2b7d TG |
1018 | if (data) |
1019 | memcpy(data, attr_data, sizeof(struct ether_addr)); | |
4e9e7f18 SS |
1020 | |
1021 | return 0; | |
1022 | } | |
1023 | ||
aba496a5 UTL |
1024 | int sd_rtnl_message_read_cache_info(sd_rtnl_message *m, unsigned short type, struct ifa_cacheinfo *info) { |
1025 | int r; | |
1026 | void *attr_data; | |
1027 | ||
73ae2b7d TG |
1028 | assert_return(m, -EINVAL); |
1029 | ||
aba496a5 UTL |
1030 | r = message_attribute_has_type(m, type, NLA_CACHE_INFO); |
1031 | if (r < 0) | |
1032 | return r; | |
1033 | ||
1034 | r = rtnl_message_read_internal(m, type, &attr_data); | |
1035 | if (r < 0) | |
1036 | return r; | |
1037 | else if ((size_t)r < sizeof(struct ifa_cacheinfo)) | |
1038 | return -EIO; | |
1039 | ||
73ae2b7d TG |
1040 | if (info) |
1041 | memcpy(info, attr_data, sizeof(struct ifa_cacheinfo)); | |
aba496a5 UTL |
1042 | |
1043 | return 0; | |
1044 | } | |
1045 | ||
4e9e7f18 SS |
1046 | int sd_rtnl_message_read_in_addr(sd_rtnl_message *m, unsigned short type, struct in_addr *data) { |
1047 | int r; | |
1048 | void *attr_data; | |
1049 | ||
73ae2b7d TG |
1050 | assert_return(m, -EINVAL); |
1051 | ||
d8e538ec TG |
1052 | r = message_attribute_has_type(m, type, NLA_IN_ADDR); |
1053 | if (r < 0) | |
1054 | return r; | |
4e9e7f18 SS |
1055 | |
1056 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 1057 | if (r < 0) |
4e9e7f18 | 1058 | return r; |
f66eeb6b TG |
1059 | else if ((size_t)r < sizeof(struct in_addr)) |
1060 | return -EIO; | |
4e9e7f18 | 1061 | |
73ae2b7d TG |
1062 | if (data) |
1063 | memcpy(data, attr_data, sizeof(struct in_addr)); | |
4e9e7f18 SS |
1064 | |
1065 | return 0; | |
1066 | } | |
1067 | ||
1068 | int sd_rtnl_message_read_in6_addr(sd_rtnl_message *m, unsigned short type, struct in6_addr *data) { | |
1069 | int r; | |
1070 | void *attr_data; | |
1071 | ||
73ae2b7d TG |
1072 | assert_return(m, -EINVAL); |
1073 | ||
d8e538ec TG |
1074 | r = message_attribute_has_type(m, type, NLA_IN_ADDR); |
1075 | if (r < 0) | |
1076 | return r; | |
4e9e7f18 SS |
1077 | |
1078 | r = rtnl_message_read_internal(m, type, &attr_data); | |
3dd215e0 | 1079 | if (r < 0) |
4e9e7f18 | 1080 | return r; |
3dd215e0 TG |
1081 | else if ((size_t)r < sizeof(struct in6_addr)) |
1082 | return -EIO; | |
4e9e7f18 | 1083 | |
73ae2b7d TG |
1084 | if (data) |
1085 | memcpy(data, attr_data, sizeof(struct in6_addr)); | |
4e9e7f18 SS |
1086 | |
1087 | return 0; | |
1088 | } | |
1089 | ||
3dd215e0 | 1090 | int sd_rtnl_message_enter_container(sd_rtnl_message *m, unsigned short type) { |
d8e538ec TG |
1091 | const NLType *nl_type; |
1092 | const NLTypeSystem *type_system; | |
3dd215e0 | 1093 | void *container; |
d8e538ec TG |
1094 | size_t size; |
1095 | int r; | |
3dd215e0 TG |
1096 | |
1097 | assert_return(m, -EINVAL); | |
1098 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -EINVAL); | |
1099 | ||
d8e538ec TG |
1100 | r = type_system_get_type(m->container_type_system[m->n_containers], |
1101 | &nl_type, | |
1102 | type); | |
3dd215e0 TG |
1103 | if (r < 0) |
1104 | return r; | |
3dd215e0 | 1105 | |
d8e538ec TG |
1106 | if (nl_type->type == NLA_NESTED) { |
1107 | r = type_system_get_type_system(m->container_type_system[m->n_containers], | |
1108 | &type_system, | |
1109 | type); | |
1110 | if (r < 0) | |
1111 | return r; | |
1112 | } else if (nl_type->type == NLA_UNION) { | |
1113 | const NLTypeSystemUnion *type_system_union; | |
ca4e095a | 1114 | const char *key; |
d8e538ec TG |
1115 | |
1116 | r = type_system_get_type_system_union(m->container_type_system[m->n_containers], | |
1117 | &type_system_union, | |
1118 | type); | |
1119 | if (r < 0) | |
1120 | return r; | |
1121 | ||
1122 | r = sd_rtnl_message_read_string(m, type_system_union->match, &key); | |
1123 | if (r < 0) | |
1124 | return r; | |
1125 | ||
1126 | r = type_system_union_get_type_system(type_system_union, | |
1127 | &type_system, | |
1128 | key); | |
1129 | if (r < 0) | |
1130 | return r; | |
1131 | } else | |
1132 | return -EINVAL; | |
1133 | ||
1134 | r = rtnl_message_read_internal(m, type, &container); | |
3dd215e0 TG |
1135 | if (r < 0) |
1136 | return r; | |
d8e538ec TG |
1137 | else |
1138 | size = (size_t)r; | |
3dd215e0 | 1139 | |
d8e538ec | 1140 | m->n_containers ++; |
3dd215e0 TG |
1141 | |
1142 | r = rtnl_message_parse(m, | |
d8e538ec TG |
1143 | &m->rta_offset_tb[m->n_containers], |
1144 | &m->rta_tb_size[m->n_containers], | |
1145 | type_system->max, | |
3dd215e0 | 1146 | container, |
d8e538ec TG |
1147 | size); |
1148 | if (r < 0) { | |
1149 | m->n_containers --; | |
3dd215e0 | 1150 | return r; |
d8e538ec | 1151 | } |
3dd215e0 | 1152 | |
d8e538ec | 1153 | m->container_type_system[m->n_containers] = type_system; |
3dd215e0 TG |
1154 | |
1155 | return 0; | |
1156 | } | |
1157 | ||
e5c4350b TG |
1158 | int sd_rtnl_message_exit_container(sd_rtnl_message *m) { |
1159 | assert_return(m, -EINVAL); | |
1160 | assert_return(m->sealed, -EINVAL); | |
1161 | assert_return(m->n_containers > 0, -EINVAL); | |
1162 | ||
3dd215e0 TG |
1163 | free(m->rta_offset_tb[m->n_containers]); |
1164 | m->rta_offset_tb[m->n_containers] = NULL; | |
d8e538ec | 1165 | m->container_type_system[m->n_containers] = NULL; |
3dd215e0 | 1166 | |
e5c4350b TG |
1167 | m->n_containers --; |
1168 | ||
1169 | return 0; | |
1170 | } | |
1171 | ||
3815f36f | 1172 | uint32_t rtnl_message_get_serial(sd_rtnl_message *m) { |
65f568bb | 1173 | assert(m); |
9d0db178 | 1174 | assert(m->hdr); |
65f568bb TG |
1175 | |
1176 | return m->hdr->nlmsg_seq; | |
1177 | } | |
1178 | ||
e16bcf98 | 1179 | int sd_rtnl_message_get_errno(sd_rtnl_message *m) { |
65f568bb TG |
1180 | struct nlmsgerr *err; |
1181 | ||
e16bcf98 | 1182 | assert_return(m, -EINVAL); |
9d0db178 | 1183 | assert_return(m->hdr, -EINVAL); |
65f568bb TG |
1184 | |
1185 | if (m->hdr->nlmsg_type != NLMSG_ERROR) | |
1186 | return 0; | |
1187 | ||
1188 | err = NLMSG_DATA(m->hdr); | |
1189 | ||
1190 | return err->error; | |
1191 | } | |
1192 | ||
44caa5e7 SS |
1193 | int rtnl_message_parse(sd_rtnl_message *m, |
1194 | size_t **rta_offset_tb, | |
1195 | unsigned short *rta_tb_size, | |
1196 | int max, | |
1197 | struct rtattr *rta, | |
1198 | unsigned int rt_len) { | |
e634cd40 | 1199 | unsigned short type; |
44caa5e7 SS |
1200 | size_t *tb; |
1201 | ||
c8a7165f | 1202 | tb = new0(size_t, max + 1); |
44caa5e7 SS |
1203 | if(!tb) |
1204 | return -ENOMEM; | |
1205 | ||
c8a7165f | 1206 | *rta_tb_size = max + 1; |
44caa5e7 SS |
1207 | |
1208 | for (; RTA_OK(rta, rt_len); rta = RTA_NEXT(rta, rt_len)) { | |
0a2478a9 | 1209 | type = RTA_TYPE(rta); |
44caa5e7 | 1210 | |
aef0768e TG |
1211 | /* if the kernel is newer than the headers we used |
1212 | when building, we ignore out-of-range attributes | |
1213 | */ | |
1214 | if (type > max) | |
e634cd40 | 1215 | continue; |
e634cd40 TG |
1216 | |
1217 | if (tb[type]) | |
1218 | log_debug("rtnl: message parse - overwriting repeated attribute"); | |
1219 | ||
1220 | tb[type] = (uint8_t *) rta - (uint8_t *) m->hdr; | |
44caa5e7 SS |
1221 | } |
1222 | ||
1223 | *rta_offset_tb = tb; | |
1224 | ||
1225 | return 0; | |
1226 | } | |
1227 | ||
65f568bb TG |
1228 | /* returns the number of bytes sent, or a negative error code */ |
1229 | int socket_write_message(sd_rtnl *nl, sd_rtnl_message *m) { | |
d4bbdb77 TG |
1230 | union { |
1231 | struct sockaddr sa; | |
1232 | struct sockaddr_nl nl; | |
1233 | } addr = { | |
1234 | .nl.nl_family = AF_NETLINK, | |
1235 | }; | |
65f568bb TG |
1236 | ssize_t k; |
1237 | ||
9d0db178 TG |
1238 | assert(nl); |
1239 | assert(m); | |
1240 | assert(m->hdr); | |
65f568bb TG |
1241 | |
1242 | k = sendto(nl->fd, m->hdr, m->hdr->nlmsg_len, | |
d4bbdb77 | 1243 | 0, &addr.sa, sizeof(addr)); |
65f568bb TG |
1244 | if (k < 0) |
1245 | return (errno == EAGAIN) ? 0 : -errno; | |
1246 | ||
1247 | return k; | |
1248 | } | |
1249 | ||
66269b05 TG |
1250 | static int socket_recv_message(int fd, struct iovec *iov, uint32_t *_group, bool peek) { |
1251 | uint8_t cred_buffer[CMSG_SPACE(sizeof(struct ucred)) + | |
1252 | CMSG_SPACE(sizeof(struct nl_pktinfo))]; | |
bc078e71 | 1253 | struct msghdr msg = { |
26349add | 1254 | .msg_iov = iov, |
bc078e71 TG |
1255 | .msg_iovlen = 1, |
1256 | .msg_control = cred_buffer, | |
1257 | .msg_controllen = sizeof(cred_buffer), | |
1258 | }; | |
1259 | struct cmsghdr *cmsg; | |
66269b05 | 1260 | uint32_t group = 0; |
26349add | 1261 | bool auth = false; |
4e996881 | 1262 | int r; |
d4bbdb77 | 1263 | |
26349add TG |
1264 | assert(fd >= 0); |
1265 | assert(iov); | |
bc078e71 | 1266 | |
26349add | 1267 | r = recvmsg(fd, &msg, MSG_TRUNC | (peek ? MSG_PEEK : 0)); |
5968b1c3 | 1268 | if (r < 0) { |
bc078e71 | 1269 | /* no data */ |
5968b1c3 TG |
1270 | if (errno == ENOBUFS) |
1271 | log_debug("rtnl: kernel receive buffer overrun"); | |
1272 | ||
bc078e71 | 1273 | return (errno == EAGAIN) ? 0 : -errno; |
5968b1c3 | 1274 | } else if (r == 0) |
bc078e71 TG |
1275 | /* connection was closed by the kernel */ |
1276 | return -ECONNRESET; | |
3dd215e0 | 1277 | |
bc078e71 TG |
1278 | for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) { |
1279 | if (cmsg->cmsg_level == SOL_SOCKET && | |
1280 | cmsg->cmsg_type == SCM_CREDENTIALS && | |
1281 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) { | |
1282 | struct ucred *ucred = (void *)CMSG_DATA(cmsg); | |
1283 | ||
1284 | /* from the kernel */ | |
66269b05 | 1285 | if (ucred->uid == 0 && ucred->pid == 0) |
bc078e71 | 1286 | auth = true; |
66269b05 TG |
1287 | } else if (cmsg->cmsg_level == SOL_NETLINK && |
1288 | cmsg->cmsg_type == NETLINK_PKTINFO && | |
1289 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct nl_pktinfo))) { | |
1290 | struct nl_pktinfo *pktinfo = (void *)CMSG_DATA(cmsg); | |
1291 | ||
1292 | /* multi-cast group */ | |
1293 | group = pktinfo->group; | |
bc078e71 TG |
1294 | } |
1295 | } | |
1296 | ||
1297 | if (!auth) | |
1298 | /* not from the kernel, ignore */ | |
1299 | return 0; | |
1300 | ||
66269b05 TG |
1301 | if (group) |
1302 | *_group = group; | |
1303 | ||
26349add TG |
1304 | return r; |
1305 | } | |
1306 | ||
1307 | /* On success, the number of bytes received is returned and *ret points to the received message | |
1308 | * which has a valid header and the correct size. | |
1309 | * If nothing useful was received 0 is returned. | |
1310 | * On failure, a negative error code is returned. | |
1311 | */ | |
1312 | int socket_read_message(sd_rtnl *rtnl) { | |
1313 | _cleanup_rtnl_message_unref_ sd_rtnl_message *first = NULL; | |
1314 | struct iovec iov = {}; | |
66269b05 | 1315 | uint32_t group = 0; |
26349add TG |
1316 | bool multi_part = false, done = false; |
1317 | struct nlmsghdr *new_msg; | |
1318 | size_t len; | |
1319 | int r; | |
1320 | unsigned i = 0; | |
1321 | ||
1322 | assert(rtnl); | |
1323 | assert(rtnl->rbuffer); | |
1324 | assert(rtnl->rbuffer_allocated >= sizeof(struct nlmsghdr)); | |
1325 | ||
1326 | /* read nothing, just get the pending message size */ | |
66269b05 | 1327 | r = socket_recv_message(rtnl->fd, &iov, &group, true); |
26349add TG |
1328 | if (r <= 0) |
1329 | return r; | |
1330 | else | |
1331 | len = (size_t)r; | |
1332 | ||
1333 | /* make room for the pending message */ | |
1334 | if (!greedy_realloc((void **)&rtnl->rbuffer, | |
1335 | &rtnl->rbuffer_allocated, | |
1336 | len, sizeof(uint8_t))) | |
1337 | return -ENOMEM; | |
1338 | ||
1339 | iov.iov_base = rtnl->rbuffer; | |
1340 | iov.iov_len = rtnl->rbuffer_allocated; | |
1341 | ||
1342 | /* read the pending message */ | |
66269b05 | 1343 | r = socket_recv_message(rtnl->fd, &iov, &group, false); |
26349add TG |
1344 | if (r <= 0) |
1345 | return r; | |
1346 | else | |
1347 | len = (size_t)r; | |
1348 | ||
127dc4ea TG |
1349 | if (len > rtnl->rbuffer_allocated) |
1350 | /* message did not fit in read buffer */ | |
1351 | return -EIO; | |
1352 | ||
4e996881 TG |
1353 | if (NLMSG_OK(rtnl->rbuffer, len) && rtnl->rbuffer->nlmsg_flags & NLM_F_MULTI) { |
1354 | multi_part = true; | |
1355 | ||
1356 | for (i = 0; i < rtnl->rqueue_partial_size; i++) { | |
1357 | if (rtnl_message_get_serial(rtnl->rqueue_partial[i]) == | |
1358 | rtnl->rbuffer->nlmsg_seq) { | |
1359 | first = rtnl->rqueue_partial[i]; | |
1360 | break; | |
1361 | } | |
1362 | } | |
1363 | } | |
1364 | ||
a88f77c4 | 1365 | for (new_msg = rtnl->rbuffer; NLMSG_OK(new_msg, len); new_msg = NLMSG_NEXT(new_msg, len)) { |
1b89cf56 TG |
1366 | _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL; |
1367 | const NLType *nl_type; | |
3dd215e0 | 1368 | |
8fe65c03 | 1369 | if (!group && new_msg->nlmsg_pid != rtnl->sockaddr.nl.nl_pid) |
1b89cf56 TG |
1370 | /* not broadcast and not for us */ |
1371 | continue; | |
3dd215e0 | 1372 | |
1b89cf56 | 1373 | if (new_msg->nlmsg_type == NLMSG_NOOP) |
4e996881 | 1374 | /* silently drop noop messages */ |
1b89cf56 | 1375 | continue; |
bdd13f6b | 1376 | |
4e996881 TG |
1377 | if (new_msg->nlmsg_type == NLMSG_DONE) { |
1378 | /* finished reading multi-part message */ | |
1379 | done = true; | |
1403f45a | 1380 | break; |
4e996881 | 1381 | } |
1403f45a | 1382 | |
1b89cf56 TG |
1383 | /* check that we support this message type */ |
1384 | r = type_system_get_type(NULL, &nl_type, new_msg->nlmsg_type); | |
1385 | if (r < 0) { | |
1386 | if (r == -ENOTSUP) | |
1387 | log_debug("sd-rtnl: ignored message with unknown type: %u", | |
1388 | new_msg->nlmsg_type); | |
d8e538ec | 1389 | |
1b89cf56 TG |
1390 | continue; |
1391 | } | |
bdd13f6b | 1392 | |
1b89cf56 | 1393 | /* check that the size matches the message type */ |
64918838 TG |
1394 | if (new_msg->nlmsg_len < NLMSG_LENGTH(nl_type->size)) { |
1395 | log_debug("sd-rtnl: message larger than expected, dropping"); | |
1b89cf56 | 1396 | continue; |
64918838 | 1397 | } |
65f568bb | 1398 | |
1b89cf56 TG |
1399 | r = message_new_empty(rtnl, &m); |
1400 | if (r < 0) | |
1401 | return r; | |
1402 | ||
1403 | m->hdr = memdup(new_msg, new_msg->nlmsg_len); | |
1404 | if (!m->hdr) | |
1405 | return -ENOMEM; | |
1406 | ||
1407 | /* seal and parse the top-level message */ | |
1408 | r = sd_rtnl_message_rewind(m); | |
1409 | if (r < 0) | |
1410 | return r; | |
1411 | ||
4e996881 TG |
1412 | /* push the message onto the multi-part message stack */ |
1413 | if (first) | |
1414 | m->next = first; | |
1415 | first = m; | |
1b89cf56 | 1416 | m = NULL; |
4e996881 | 1417 | } |
1403f45a | 1418 | |
4e996881 TG |
1419 | if (len) |
1420 | log_debug("sd-rtnl: discarding %zu bytes of incoming message", len); | |
1b89cf56 | 1421 | |
4e996881 TG |
1422 | if (!first) |
1423 | return 0; | |
65f568bb | 1424 | |
4e996881 TG |
1425 | if (!multi_part || done) { |
1426 | /* we got a complete message, push it on the read queue */ | |
24a02673 TG |
1427 | r = rtnl_rqueue_make_room(rtnl); |
1428 | if (r < 0) | |
1429 | return r; | |
1430 | ||
d4ef4f46 TG |
1431 | rtnl->rqueue[rtnl->rqueue_size ++] = first; |
1432 | first = NULL; | |
1433 | ||
1434 | if (multi_part && (i < rtnl->rqueue_partial_size)) { | |
4e996881 TG |
1435 | /* remove the message form the partial read queue */ |
1436 | memmove(rtnl->rqueue_partial + i,rtnl->rqueue_partial + i + 1, | |
1437 | sizeof(sd_rtnl_message*) * (rtnl->rqueue_partial_size - i - 1)); | |
1438 | rtnl->rqueue_partial_size --; | |
1439 | } | |
1440 | ||
4e996881 TG |
1441 | return 1; |
1442 | } else { | |
1443 | /* we only got a partial multi-part message, push it on the | |
1444 | partial read queue */ | |
1445 | if (i < rtnl->rqueue_partial_size) { | |
1446 | rtnl->rqueue_partial[i] = first; | |
1447 | } else { | |
1448 | r = rtnl_rqueue_partial_make_room(rtnl); | |
1449 | if (r < 0) | |
1450 | return r; | |
1451 | ||
1452 | rtnl->rqueue_partial[rtnl->rqueue_partial_size ++] = first; | |
1453 | } | |
1454 | first = NULL; | |
1403f45a | 1455 | |
4e996881 TG |
1456 | return 0; |
1457 | } | |
65f568bb | 1458 | } |
0fc7531b TG |
1459 | |
1460 | int sd_rtnl_message_rewind(sd_rtnl_message *m) { | |
d8e538ec | 1461 | const NLType *type; |
3dd215e0 TG |
1462 | unsigned i; |
1463 | int r; | |
0fc7531b TG |
1464 | |
1465 | assert_return(m, -EINVAL); | |
0fc7531b | 1466 | |
3dd215e0 TG |
1467 | /* don't allow appending to message once parsed */ |
1468 | if (!m->sealed) | |
1469 | rtnl_message_seal(m); | |
1470 | ||
1471 | for (i = 1; i <= m->n_containers; i++) { | |
1472 | free(m->rta_offset_tb[i]); | |
1473 | m->rta_offset_tb[i] = NULL; | |
1474 | m->rta_tb_size[i] = 0; | |
d8e538ec | 1475 | m->container_type_system[i] = NULL; |
3dd215e0 TG |
1476 | } |
1477 | ||
1478 | m->n_containers = 0; | |
1479 | ||
1480 | if (m->rta_offset_tb[0]) { | |
1481 | /* top-level attributes have already been parsed */ | |
1482 | return 0; | |
1483 | } | |
1484 | ||
d8e538ec TG |
1485 | assert(m->hdr); |
1486 | ||
1487 | r = type_system_get_type(NULL, &type, m->hdr->nlmsg_type); | |
1488 | if (r < 0) | |
1489 | return r; | |
1490 | ||
1491 | if (type->type == NLA_NESTED) { | |
1492 | const NLTypeSystem *type_system = type->type_system; | |
1493 | ||
1494 | assert(type_system); | |
1495 | ||
1496 | m->container_type_system[0] = type_system; | |
1497 | ||
1498 | r = rtnl_message_parse(m, | |
1499 | &m->rta_offset_tb[m->n_containers], | |
1500 | &m->rta_tb_size[m->n_containers], | |
1501 | type_system->max, | |
0834ff93 TG |
1502 | (struct rtattr*)((uint8_t*)NLMSG_DATA(m->hdr) + |
1503 | NLMSG_ALIGN(type->size)), | |
d8e538ec TG |
1504 | NLMSG_PAYLOAD(m->hdr, type->size)); |
1505 | if (r < 0) | |
1506 | return r; | |
0fc7531b TG |
1507 | } |
1508 | ||
1509 | return 0; | |
1510 | } | |
3dd215e0 TG |
1511 | |
1512 | void rtnl_message_seal(sd_rtnl_message *m) { | |
1513 | assert(m); | |
1514 | assert(!m->sealed); | |
1515 | ||
1516 | m->sealed = true; | |
1517 | } | |
1403f45a TG |
1518 | |
1519 | sd_rtnl_message *sd_rtnl_message_next(sd_rtnl_message *m) { | |
1520 | assert_return(m, NULL); | |
1521 | ||
1522 | return m->next; | |
1523 | } |