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