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65f568bb TG |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Tom Gundersen <teg@jklm.no> | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <netinet/in.h> | |
65f568bb TG |
23 | #include <stdbool.h> |
24 | #include <unistd.h> | |
25 | ||
26 | #include "util.h" | |
2ce84835 | 27 | #include "socket-util.h" |
6482f626 | 28 | #include "formats-util.h" |
65f568bb | 29 | #include "refcnt.h" |
d5eff740 | 30 | #include "missing.h" |
65f568bb | 31 | |
1c4baffc TG |
32 | #include "sd-netlink.h" |
33 | #include "netlink-util.h" | |
34 | #include "netlink-internal.h" | |
35 | #include "netlink-types.h" | |
65f568bb | 36 | |
31a4e153 | 37 | #define GET_CONTAINER(m, i) ((i) < (m)->n_containers ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->container_offsets[i]) : NULL) |
e5c4350b | 38 | #define PUSH_CONTAINER(m, new) (m)->container_offsets[(m)->n_containers ++] = (uint8_t*)(new) - (uint8_t*)(m)->hdr; |
4ebe732c | 39 | |
0a2478a9 TG |
40 | #define RTA_TYPE(rta) ((rta)->rta_type & NLA_TYPE_MASK) |
41 | ||
1c4baffc TG |
42 | static int message_new_empty(sd_netlink *rtnl, sd_netlink_message **ret) { |
43 | sd_netlink_message *m; | |
65f568bb TG |
44 | |
45 | assert_return(ret, -EINVAL); | |
65f568bb | 46 | |
f131770b | 47 | /* Note that 'rtnl' is currently unused, if we start using it internally |
8c578303 | 48 | we must take care to avoid problems due to mutual references between |
ff9b60f3 | 49 | buses and their queued messages. See sd-bus. |
8c578303 TG |
50 | */ |
51 | ||
1c4baffc | 52 | m = new0(sd_netlink_message, 1); |
65f568bb TG |
53 | if (!m) |
54 | return -ENOMEM; | |
55 | ||
65f568bb TG |
56 | m->n_ref = REFCNT_INIT; |
57 | ||
65f568bb TG |
58 | m->sealed = false; |
59 | ||
60 | *ret = m; | |
61 | ||
62 | return 0; | |
63 | } | |
64 | ||
1c4baffc TG |
65 | int message_new(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t type) { |
66 | _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL; | |
d8e538ec TG |
67 | const NLType *nl_type; |
68 | size_t size; | |
69 | int r; | |
70 | ||
71 | r = type_system_get_type(NULL, &nl_type, type); | |
72 | if (r < 0) | |
73 | return r; | |
74 | ||
1b89cf56 | 75 | r = message_new_empty(rtnl, &m); |
d8e538ec TG |
76 | if (r < 0) |
77 | return r; | |
78 | ||
1b89cf56 TG |
79 | size = NLMSG_SPACE(nl_type->size); |
80 | ||
81 | assert(size >= sizeof(struct nlmsghdr)); | |
82 | m->hdr = malloc0(size); | |
83 | if (!m->hdr) | |
84 | return -ENOMEM; | |
85 | ||
86 | m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; | |
87 | ||
88 | m->container_type_system[0] = nl_type->type_system; | |
89 | m->hdr->nlmsg_len = size; | |
90 | m->hdr->nlmsg_type = type; | |
91 | ||
92 | *ret = m; | |
93 | m = NULL; | |
d8e538ec TG |
94 | |
95 | return 0; | |
96 | } | |
97 | ||
1c4baffc | 98 | int sd_rtnl_message_route_set_dst_prefixlen(sd_netlink_message *m, unsigned char prefixlen) { |
1f01fb4f TG |
99 | struct rtmsg *rtm; |
100 | ||
5a723174 TG |
101 | assert_return(m, -EINVAL); |
102 | assert_return(m->hdr, -EINVAL); | |
3815f36f | 103 | assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); |
5a723174 | 104 | |
1f01fb4f TG |
105 | rtm = NLMSG_DATA(m->hdr); |
106 | ||
5a723174 TG |
107 | if ((rtm->rtm_family == AF_INET && prefixlen > 32) || |
108 | (rtm->rtm_family == AF_INET6 && prefixlen > 128)) | |
109 | return -ERANGE; | |
110 | ||
1f01fb4f TG |
111 | rtm->rtm_dst_len = prefixlen; |
112 | ||
5c1d3fc9 UTL |
113 | return 0; |
114 | } | |
115 | ||
1c4baffc | 116 | int sd_rtnl_message_route_set_src_prefixlen(sd_netlink_message *m, unsigned char prefixlen) { |
9e7e4408 TG |
117 | struct rtmsg *rtm; |
118 | ||
119 | assert_return(m, -EINVAL); | |
120 | assert_return(m->hdr, -EINVAL); | |
121 | assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); | |
122 | ||
123 | rtm = NLMSG_DATA(m->hdr); | |
124 | ||
125 | if ((rtm->rtm_family == AF_INET && prefixlen > 32) || | |
126 | (rtm->rtm_family == AF_INET6 && prefixlen > 128)) | |
127 | return -ERANGE; | |
128 | ||
129 | rtm->rtm_src_len = prefixlen; | |
130 | ||
131 | return 0; | |
132 | } | |
133 | ||
1c4baffc | 134 | int sd_rtnl_message_route_set_scope(sd_netlink_message *m, unsigned char scope) { |
5c1d3fc9 UTL |
135 | struct rtmsg *rtm; |
136 | ||
137 | assert_return(m, -EINVAL); | |
138 | assert_return(m->hdr, -EINVAL); | |
139 | assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); | |
140 | ||
141 | rtm = NLMSG_DATA(m->hdr); | |
142 | ||
143 | rtm->rtm_scope = scope; | |
144 | ||
1f01fb4f TG |
145 | return 0; |
146 | } | |
147 | ||
1c4baffc | 148 | int sd_rtnl_message_route_get_family(sd_netlink_message *m, int *family) { |
dae4de9d TG |
149 | struct rtmsg *rtm; |
150 | ||
151 | assert_return(m, -EINVAL); | |
152 | assert_return(m->hdr, -EINVAL); | |
153 | assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); | |
154 | assert_return(family, -EINVAL); | |
155 | ||
156 | rtm = NLMSG_DATA(m->hdr); | |
157 | ||
158 | *family = rtm->rtm_family; | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
1c4baffc | 163 | int sd_rtnl_message_route_get_dst_prefixlen(sd_netlink_message *m, unsigned char *dst_len) { |
e9140aff LP |
164 | struct rtmsg *rtm; |
165 | ||
166 | assert_return(m, -EINVAL); | |
167 | assert_return(m->hdr, -EINVAL); | |
168 | assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); | |
169 | assert_return(dst_len, -EINVAL); | |
170 | ||
171 | rtm = NLMSG_DATA(m->hdr); | |
172 | ||
173 | *dst_len = rtm->rtm_dst_len; | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
1c4baffc | 178 | int sd_rtnl_message_route_get_src_prefixlen(sd_netlink_message *m, unsigned char *src_len) { |
a98433c0 LP |
179 | struct rtmsg *rtm; |
180 | ||
181 | assert_return(m, -EINVAL); | |
182 | assert_return(m->hdr, -EINVAL); | |
183 | assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); | |
184 | assert_return(src_len, -EINVAL); | |
185 | ||
186 | rtm = NLMSG_DATA(m->hdr); | |
187 | ||
188 | *src_len = rtm->rtm_src_len; | |
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
1c4baffc | 193 | int sd_rtnl_message_new_route(sd_netlink *rtnl, sd_netlink_message **ret, |
28cc555d DW |
194 | uint16_t nlmsg_type, int rtm_family, |
195 | unsigned char rtm_protocol) { | |
03d7e632 TG |
196 | struct rtmsg *rtm; |
197 | int r; | |
198 | ||
3815f36f | 199 | assert_return(rtnl_message_type_is_route(nlmsg_type), -EINVAL); |
722f7cc9 TG |
200 | assert_return((nlmsg_type == RTM_GETROUTE && rtm_family == AF_UNSPEC) || |
201 | rtm_family == AF_INET || rtm_family == AF_INET6, -EINVAL); | |
03d7e632 TG |
202 | assert_return(ret, -EINVAL); |
203 | ||
d8e538ec | 204 | r = message_new(rtnl, ret, nlmsg_type); |
03d7e632 TG |
205 | if (r < 0) |
206 | return r; | |
207 | ||
03d7e632 | 208 | if (nlmsg_type == RTM_NEWROUTE) |
3f781aa8 | 209 | (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_APPEND; |
03d7e632 TG |
210 | |
211 | rtm = NLMSG_DATA((*ret)->hdr); | |
212 | ||
213 | rtm->rtm_family = rtm_family; | |
1f01fb4f TG |
214 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; |
215 | rtm->rtm_type = RTN_UNICAST; | |
216 | rtm->rtm_table = RT_TABLE_MAIN; | |
28cc555d | 217 | rtm->rtm_protocol = rtm_protocol; |
03d7e632 TG |
218 | |
219 | return 0; | |
220 | } | |
221 | ||
1c4baffc | 222 | int sd_rtnl_message_neigh_set_flags(sd_netlink_message *m, uint8_t flags) { |
b98b483b AR |
223 | struct ndmsg *ndm; |
224 | ||
225 | assert_return(m, -EINVAL); | |
226 | assert_return(m->hdr, -EINVAL); | |
227 | assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); | |
228 | ||
229 | ndm = NLMSG_DATA(m->hdr); | |
230 | ndm->ndm_flags |= flags; | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
1c4baffc | 235 | int sd_rtnl_message_neigh_set_state(sd_netlink_message *m, uint16_t state) { |
b98b483b AR |
236 | struct ndmsg *ndm; |
237 | ||
238 | assert_return(m, -EINVAL); | |
239 | assert_return(m->hdr, -EINVAL); | |
240 | assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); | |
241 | ||
242 | ndm = NLMSG_DATA(m->hdr); | |
243 | ndm->ndm_state |= state; | |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
1c4baffc | 248 | int sd_rtnl_message_neigh_get_flags(sd_netlink_message *m, uint8_t *flags) { |
b98b483b AR |
249 | struct ndmsg *ndm; |
250 | ||
251 | assert_return(m, -EINVAL); | |
252 | assert_return(m->hdr, -EINVAL); | |
253 | assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); | |
254 | ||
255 | ndm = NLMSG_DATA(m->hdr); | |
256 | *flags = ndm->ndm_flags; | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
1c4baffc | 261 | int sd_rtnl_message_neigh_get_state(sd_netlink_message *m, uint16_t *state) { |
b98b483b AR |
262 | struct ndmsg *ndm; |
263 | ||
264 | assert_return(m, -EINVAL); | |
265 | assert_return(m->hdr, -EINVAL); | |
266 | assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); | |
267 | ||
268 | ndm = NLMSG_DATA(m->hdr); | |
269 | *state = ndm->ndm_state; | |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
1c4baffc | 274 | int sd_rtnl_message_neigh_get_family(sd_netlink_message *m, int *family) { |
20dff6c4 TG |
275 | struct ndmsg *ndm; |
276 | ||
277 | assert_return(m, -EINVAL); | |
278 | assert_return(m->hdr, -EINVAL); | |
279 | assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); | |
280 | assert_return(family, -EINVAL); | |
281 | ||
282 | ndm = NLMSG_DATA(m->hdr); | |
283 | ||
284 | *family = ndm->ndm_family; | |
285 | ||
286 | return 0; | |
287 | } | |
288 | ||
1c4baffc | 289 | int sd_rtnl_message_neigh_get_ifindex(sd_netlink_message *m, int *index) { |
20dff6c4 TG |
290 | struct ndmsg *ndm; |
291 | ||
292 | assert_return(m, -EINVAL); | |
293 | assert_return(m->hdr, -EINVAL); | |
294 | assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL); | |
295 | assert_return(index, -EINVAL); | |
296 | ||
297 | ndm = NLMSG_DATA(m->hdr); | |
298 | ||
299 | *index = ndm->ndm_ifindex; | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
1c4baffc | 304 | int sd_rtnl_message_new_neigh(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t nlmsg_type, int index, int ndm_family) { |
20dff6c4 TG |
305 | struct ndmsg *ndm; |
306 | int r; | |
307 | ||
308 | assert_return(rtnl_message_type_is_neigh(nlmsg_type), -EINVAL); | |
b98b483b AR |
309 | assert_return(ndm_family == AF_INET || |
310 | ndm_family == AF_INET6 || | |
311 | ndm_family == PF_BRIDGE, -EINVAL); | |
20dff6c4 TG |
312 | assert_return(ret, -EINVAL); |
313 | ||
314 | r = message_new(rtnl, ret, nlmsg_type); | |
315 | if (r < 0) | |
316 | return r; | |
317 | ||
318 | if (nlmsg_type == RTM_NEWNEIGH) | |
319 | (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_APPEND; | |
320 | ||
321 | ndm = NLMSG_DATA((*ret)->hdr); | |
322 | ||
323 | ndm->ndm_family = ndm_family; | |
324 | ndm->ndm_ifindex = index; | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
1c4baffc | 329 | int sd_rtnl_message_link_set_flags(sd_netlink_message *m, unsigned flags, unsigned change) { |
fc25d7f8 TG |
330 | struct ifinfomsg *ifi; |
331 | ||
5a723174 TG |
332 | assert_return(m, -EINVAL); |
333 | assert_return(m->hdr, -EINVAL); | |
3815f36f | 334 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); |
a7b74db6 | 335 | assert_return(change, -EINVAL); |
5a723174 | 336 | |
fc25d7f8 TG |
337 | ifi = NLMSG_DATA(m->hdr); |
338 | ||
339 | ifi->ifi_flags = flags; | |
a7b74db6 | 340 | ifi->ifi_change = change; |
fc25d7f8 TG |
341 | |
342 | return 0; | |
343 | } | |
344 | ||
1c4baffc | 345 | int sd_rtnl_message_link_set_type(sd_netlink_message *m, unsigned type) { |
fc25d7f8 TG |
346 | struct ifinfomsg *ifi; |
347 | ||
5a723174 TG |
348 | assert_return(m, -EINVAL); |
349 | assert_return(m->hdr, -EINVAL); | |
3815f36f | 350 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); |
5a723174 | 351 | |
fc25d7f8 TG |
352 | ifi = NLMSG_DATA(m->hdr); |
353 | ||
354 | ifi->ifi_type = type; | |
355 | ||
356 | return 0; | |
357 | } | |
358 | ||
1c4baffc | 359 | int sd_rtnl_message_link_set_family(sd_netlink_message *m, unsigned family) { |
64c84071 SS |
360 | struct ifinfomsg *ifi; |
361 | ||
362 | assert_return(m, -EINVAL); | |
363 | assert_return(m->hdr, -EINVAL); | |
364 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); | |
365 | ||
366 | ifi = NLMSG_DATA(m->hdr); | |
367 | ||
368 | ifi->ifi_family = family; | |
369 | ||
370 | return 0; | |
371 | } | |
372 | ||
1c4baffc | 373 | int sd_rtnl_message_new_link(sd_netlink *rtnl, sd_netlink_message **ret, |
151b9b96 | 374 | uint16_t nlmsg_type, int index) { |
65f568bb TG |
375 | struct ifinfomsg *ifi; |
376 | int r; | |
377 | ||
3815f36f | 378 | assert_return(rtnl_message_type_is_link(nlmsg_type), -EINVAL); |
6a8402d9 | 379 | assert_return(nlmsg_type != RTM_DELLINK || index > 0, -EINVAL); |
65f568bb TG |
380 | assert_return(ret, -EINVAL); |
381 | ||
d8e538ec | 382 | r = message_new(rtnl, ret, nlmsg_type); |
65f568bb TG |
383 | if (r < 0) |
384 | return r; | |
385 | ||
33125ac5 | 386 | if (nlmsg_type == RTM_NEWLINK) |
6a8402d9 | 387 | (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL; |
65f568bb | 388 | |
dabfa9d1 | 389 | ifi = NLMSG_DATA((*ret)->hdr); |
65f568bb TG |
390 | |
391 | ifi->ifi_family = AF_UNSPEC; | |
392 | ifi->ifi_index = index; | |
65f568bb TG |
393 | |
394 | return 0; | |
395 | } | |
396 | ||
1c4baffc | 397 | int sd_netlink_message_request_dump(sd_netlink_message *m, int dump) { |
6e20c8f8 TG |
398 | assert_return(m, -EINVAL); |
399 | assert_return(m->hdr, -EINVAL); | |
20dff6c4 TG |
400 | assert_return(m->hdr->nlmsg_type == RTM_GETLINK || |
401 | m->hdr->nlmsg_type == RTM_GETADDR || | |
402 | m->hdr->nlmsg_type == RTM_GETROUTE || | |
403 | m->hdr->nlmsg_type == RTM_GETNEIGH, | |
6e20c8f8 TG |
404 | -EINVAL); |
405 | ||
406 | if (dump) | |
407 | m->hdr->nlmsg_flags |= NLM_F_DUMP; | |
408 | else | |
409 | m->hdr->nlmsg_flags &= ~NLM_F_DUMP; | |
410 | ||
411 | return 0; | |
412 | } | |
413 | ||
1c4baffc | 414 | int sd_rtnl_message_addr_set_prefixlen(sd_netlink_message *m, unsigned char prefixlen) { |
5a723174 TG |
415 | struct ifaddrmsg *ifa; |
416 | ||
417 | assert_return(m, -EINVAL); | |
418 | assert_return(m->hdr, -EINVAL); | |
3815f36f | 419 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); |
5a723174 TG |
420 | |
421 | ifa = NLMSG_DATA(m->hdr); | |
422 | ||
423 | if ((ifa->ifa_family == AF_INET && prefixlen > 32) || | |
424 | (ifa->ifa_family == AF_INET6 && prefixlen > 128)) | |
425 | return -ERANGE; | |
426 | ||
427 | ifa->ifa_prefixlen = prefixlen; | |
428 | ||
429 | return 0; | |
430 | } | |
431 | ||
1c4baffc | 432 | int sd_rtnl_message_addr_set_flags(sd_netlink_message *m, unsigned char flags) { |
5a723174 TG |
433 | struct ifaddrmsg *ifa; |
434 | ||
435 | assert_return(m, -EINVAL); | |
436 | assert_return(m->hdr, -EINVAL); | |
3815f36f | 437 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); |
5a723174 TG |
438 | |
439 | ifa = NLMSG_DATA(m->hdr); | |
440 | ||
441 | ifa->ifa_flags = flags; | |
442 | ||
443 | return 0; | |
444 | } | |
445 | ||
1c4baffc | 446 | int sd_rtnl_message_addr_set_scope(sd_netlink_message *m, unsigned char scope) { |
5a723174 TG |
447 | struct ifaddrmsg *ifa; |
448 | ||
449 | assert_return(m, -EINVAL); | |
450 | assert_return(m->hdr, -EINVAL); | |
3815f36f | 451 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); |
5a723174 TG |
452 | |
453 | ifa = NLMSG_DATA(m->hdr); | |
454 | ||
455 | ifa->ifa_scope = scope; | |
456 | ||
457 | return 0; | |
458 | } | |
459 | ||
1c4baffc | 460 | int sd_rtnl_message_addr_get_family(sd_netlink_message *m, int *family) { |
e00d77dd TG |
461 | struct ifaddrmsg *ifa; |
462 | ||
463 | assert_return(m, -EINVAL); | |
464 | assert_return(m->hdr, -EINVAL); | |
465 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
466 | assert_return(family, -EINVAL); | |
467 | ||
468 | ifa = NLMSG_DATA(m->hdr); | |
469 | ||
470 | *family = ifa->ifa_family; | |
471 | ||
472 | return 0; | |
473 | } | |
474 | ||
1c4baffc | 475 | int sd_rtnl_message_addr_get_prefixlen(sd_netlink_message *m, unsigned char *prefixlen) { |
f4e884dd TG |
476 | struct ifaddrmsg *ifa; |
477 | ||
478 | assert_return(m, -EINVAL); | |
479 | assert_return(m->hdr, -EINVAL); | |
480 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
481 | assert_return(prefixlen, -EINVAL); | |
482 | ||
483 | ifa = NLMSG_DATA(m->hdr); | |
484 | ||
485 | *prefixlen = ifa->ifa_prefixlen; | |
486 | ||
487 | return 0; | |
488 | } | |
489 | ||
1c4baffc | 490 | int sd_rtnl_message_addr_get_scope(sd_netlink_message *m, unsigned char *scope) { |
e00d77dd TG |
491 | struct ifaddrmsg *ifa; |
492 | ||
493 | assert_return(m, -EINVAL); | |
494 | assert_return(m->hdr, -EINVAL); | |
495 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
496 | assert_return(scope, -EINVAL); | |
497 | ||
498 | ifa = NLMSG_DATA(m->hdr); | |
499 | ||
500 | *scope = ifa->ifa_scope; | |
501 | ||
502 | return 0; | |
503 | } | |
504 | ||
1c4baffc | 505 | int sd_rtnl_message_addr_get_flags(sd_netlink_message *m, unsigned char *flags) { |
e00d77dd TG |
506 | struct ifaddrmsg *ifa; |
507 | ||
508 | assert_return(m, -EINVAL); | |
509 | assert_return(m->hdr, -EINVAL); | |
510 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
511 | assert_return(flags, -EINVAL); | |
512 | ||
513 | ifa = NLMSG_DATA(m->hdr); | |
514 | ||
515 | *flags = ifa->ifa_flags; | |
516 | ||
517 | return 0; | |
518 | } | |
519 | ||
1c4baffc | 520 | int sd_rtnl_message_addr_get_ifindex(sd_netlink_message *m, int *ifindex) { |
e00d77dd TG |
521 | struct ifaddrmsg *ifa; |
522 | ||
523 | assert_return(m, -EINVAL); | |
524 | assert_return(m->hdr, -EINVAL); | |
525 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
526 | assert_return(ifindex, -EINVAL); | |
527 | ||
528 | ifa = NLMSG_DATA(m->hdr); | |
529 | ||
530 | *ifindex = ifa->ifa_index; | |
531 | ||
532 | return 0; | |
533 | } | |
534 | ||
1c4baffc | 535 | int sd_rtnl_message_new_addr(sd_netlink *rtnl, sd_netlink_message **ret, |
151b9b96 | 536 | uint16_t nlmsg_type, int index, |
0dd25fb9 | 537 | int family) { |
65f568bb TG |
538 | struct ifaddrmsg *ifa; |
539 | int r; | |
540 | ||
3815f36f | 541 | assert_return(rtnl_message_type_is_addr(nlmsg_type), -EINVAL); |
b9ef681b TG |
542 | assert_return((nlmsg_type == RTM_GETADDR && index == 0) || |
543 | index > 0, -EINVAL); | |
544 | assert_return((nlmsg_type == RTM_GETADDR && family == AF_UNSPEC) || | |
545 | family == AF_INET || family == AF_INET6, -EINVAL); | |
65f568bb TG |
546 | assert_return(ret, -EINVAL); |
547 | ||
d8e538ec | 548 | r = message_new(rtnl, ret, nlmsg_type); |
65f568bb TG |
549 | if (r < 0) |
550 | return r; | |
551 | ||
b9ef681b | 552 | if (nlmsg_type == RTM_GETADDR) |
818dc5e7 | 553 | (*ret)->hdr->nlmsg_flags |= NLM_F_DUMP; |
65f568bb | 554 | |
dabfa9d1 | 555 | ifa = NLMSG_DATA((*ret)->hdr); |
65f568bb | 556 | |
65f568bb | 557 | ifa->ifa_index = index; |
5a723174 TG |
558 | ifa->ifa_family = family; |
559 | if (family == AF_INET) | |
560 | ifa->ifa_prefixlen = 32; | |
561 | else if (family == AF_INET6) | |
562 | ifa->ifa_prefixlen = 128; | |
65f568bb TG |
563 | |
564 | return 0; | |
565 | } | |
566 | ||
1c4baffc | 567 | int sd_rtnl_message_new_addr_update(sd_netlink *rtnl, sd_netlink_message **ret, |
0dd25fb9 | 568 | int index, int family) { |
aba496a5 UTL |
569 | int r; |
570 | ||
571 | r = sd_rtnl_message_new_addr(rtnl, ret, RTM_NEWADDR, index, family); | |
572 | if (r < 0) | |
573 | return r; | |
574 | ||
575 | (*ret)->hdr->nlmsg_flags |= NLM_F_REPLACE; | |
576 | ||
577 | return 0; | |
578 | } | |
579 | ||
1c4baffc | 580 | sd_netlink_message *sd_netlink_message_ref(sd_netlink_message *m) { |
65f568bb TG |
581 | if (m) |
582 | assert_se(REFCNT_INC(m->n_ref) >= 2); | |
583 | ||
584 | return m; | |
585 | } | |
586 | ||
1c4baffc | 587 | sd_netlink_message *sd_netlink_message_unref(sd_netlink_message *m) { |
f0c4b1c3 | 588 | if (m && REFCNT_DEC(m->n_ref) == 0) { |
3dd215e0 TG |
589 | unsigned i; |
590 | ||
65f568bb | 591 | free(m->hdr); |
3dd215e0 | 592 | |
9f5bbfe3 | 593 | for (i = 0; i <= m->n_containers; i++) |
3dd215e0 TG |
594 | free(m->rta_offset_tb[i]); |
595 | ||
1c4baffc | 596 | sd_netlink_message_unref(m->next); |
1403f45a | 597 | |
65f568bb TG |
598 | free(m); |
599 | } | |
600 | ||
601 | return NULL; | |
602 | } | |
603 | ||
1c4baffc | 604 | int sd_netlink_message_get_type(sd_netlink_message *m, uint16_t *type) { |
65f568bb TG |
605 | assert_return(m, -EINVAL); |
606 | assert_return(type, -EINVAL); | |
607 | ||
608 | *type = m->hdr->nlmsg_type; | |
609 | ||
610 | return 0; | |
611 | } | |
612 | ||
1c4baffc | 613 | int sd_netlink_message_get_family(sd_netlink_message *m, int *family) { |
4af7b60d TG |
614 | assert_return(m, -EINVAL); |
615 | assert_return(family, -EINVAL); | |
616 | ||
617 | assert(m->hdr); | |
618 | ||
619 | if (rtnl_message_type_is_link(m->hdr->nlmsg_type)) { | |
620 | struct ifinfomsg *ifi; | |
621 | ||
622 | ifi = NLMSG_DATA(m->hdr); | |
623 | ||
624 | *family = ifi->ifi_family; | |
625 | ||
626 | return 0; | |
627 | } else if (rtnl_message_type_is_route(m->hdr->nlmsg_type)) { | |
628 | struct rtmsg *rtm; | |
629 | ||
630 | rtm = NLMSG_DATA(m->hdr); | |
631 | ||
632 | *family = rtm->rtm_family; | |
633 | ||
634 | return 0; | |
635 | } else if (rtnl_message_type_is_neigh(m->hdr->nlmsg_type)) { | |
636 | struct ndmsg *ndm; | |
637 | ||
638 | ndm = NLMSG_DATA(m->hdr); | |
639 | ||
640 | *family = ndm->ndm_family; | |
641 | ||
642 | return 0; | |
643 | } else if (rtnl_message_type_is_addr(m->hdr->nlmsg_type)) { | |
644 | struct ifaddrmsg *ifa; | |
645 | ||
646 | ifa = NLMSG_DATA(m->hdr); | |
647 | ||
648 | *family = ifa->ifa_family; | |
649 | ||
650 | return 0; | |
651 | } | |
652 | ||
15411c0c | 653 | return -EOPNOTSUPP; |
4af7b60d TG |
654 | } |
655 | ||
1c4baffc | 656 | int sd_netlink_message_is_broadcast(sd_netlink_message *m) { |
1f0db3ed TG |
657 | assert_return(m, -EINVAL); |
658 | ||
3f42446d | 659 | return m->broadcast; |
1f0db3ed TG |
660 | } |
661 | ||
1c4baffc | 662 | int sd_rtnl_message_link_get_ifindex(sd_netlink_message *m, int *ifindex) { |
33125ac5 TG |
663 | struct ifinfomsg *ifi; |
664 | ||
665 | assert_return(m, -EINVAL); | |
9d0db178 | 666 | assert_return(m->hdr, -EINVAL); |
3815f36f | 667 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); |
33125ac5 | 668 | assert_return(ifindex, -EINVAL); |
33125ac5 TG |
669 | |
670 | ifi = NLMSG_DATA(m->hdr); | |
671 | ||
672 | *ifindex = ifi->ifi_index; | |
673 | ||
674 | return 0; | |
675 | } | |
676 | ||
1c4baffc | 677 | int sd_rtnl_message_link_get_flags(sd_netlink_message *m, unsigned *flags) { |
50b3c42f TG |
678 | struct ifinfomsg *ifi; |
679 | ||
680 | assert_return(m, -EINVAL); | |
9d0db178 | 681 | assert_return(m->hdr, -EINVAL); |
3815f36f | 682 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); |
50b3c42f | 683 | assert_return(flags, -EINVAL); |
50b3c42f TG |
684 | |
685 | ifi = NLMSG_DATA(m->hdr); | |
686 | ||
687 | *flags = ifi->ifi_flags; | |
688 | ||
689 | return 0; | |
690 | } | |
691 | ||
1c4baffc | 692 | int sd_rtnl_message_link_get_type(sd_netlink_message *m, unsigned *type) { |
ee8c4568 LP |
693 | struct ifinfomsg *ifi; |
694 | ||
695 | assert_return(m, -EINVAL); | |
696 | assert_return(m->hdr, -EINVAL); | |
697 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); | |
698 | assert_return(type, -EINVAL); | |
699 | ||
700 | ifi = NLMSG_DATA(m->hdr); | |
701 | ||
702 | *type = ifi->ifi_type; | |
703 | ||
704 | return 0; | |
705 | } | |
706 | ||
4ebe732c ZJS |
707 | /* If successful the updated message will be correctly aligned, if |
708 | unsuccessful the old message is untouched. */ | |
1c4baffc | 709 | static int add_rtattr(sd_netlink_message *m, unsigned short type, const void *data, size_t data_length) { |
7ca1d319 TG |
710 | uint32_t rta_length; |
711 | size_t message_length, padding_length; | |
65f568bb TG |
712 | struct nlmsghdr *new_hdr; |
713 | struct rtattr *rta; | |
8e337e64 | 714 | char *padding; |
5a081409 | 715 | unsigned i; |
7ca1d319 | 716 | int offset; |
65f568bb | 717 | |
33125ac5 TG |
718 | assert(m); |
719 | assert(m->hdr); | |
e5c4350b | 720 | assert(!m->sealed); |
33125ac5 | 721 | assert(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len); |
7ca1d319 TG |
722 | assert(!data || data_length); |
723 | ||
724 | /* get offset of the new attribute */ | |
725 | offset = m->hdr->nlmsg_len; | |
65f568bb | 726 | |
8e337e64 | 727 | /* get the size of the new rta attribute (with padding at the end) */ |
65f568bb | 728 | rta_length = RTA_LENGTH(data_length); |
4ebe732c ZJS |
729 | |
730 | /* get the new message size (with padding at the end) */ | |
7ca1d319 | 731 | message_length = offset + RTA_ALIGN(rta_length); |
65f568bb TG |
732 | |
733 | /* realloc to fit the new attribute */ | |
734 | new_hdr = realloc(m->hdr, message_length); | |
735 | if (!new_hdr) | |
736 | return -ENOMEM; | |
737 | m->hdr = new_hdr; | |
738 | ||
739 | /* get pointer to the attribute we are about to add */ | |
7ca1d319 | 740 | rta = (struct rtattr *) ((uint8_t *) m->hdr + offset); |
65f568bb | 741 | |
5a081409 TG |
742 | /* if we are inside containers, extend them */ |
743 | for (i = 0; i < m->n_containers; i++) | |
7ca1d319 | 744 | GET_CONTAINER(m, i)->rta_len += message_length - offset; |
33125ac5 | 745 | |
65f568bb TG |
746 | /* fill in the attribute */ |
747 | rta->rta_type = type; | |
748 | rta->rta_len = rta_length; | |
7ca1d319 | 749 | if (data) |
33125ac5 TG |
750 | /* we don't deal with the case where the user lies about the type |
751 | * and gives us too little data (so don't do that) | |
7ca1d319 | 752 | */ |
33125ac5 | 753 | padding = mempcpy(RTA_DATA(rta), data, data_length); |
7ca1d319 TG |
754 | else { |
755 | /* if no data was passed, make sure we still initialize the padding | |
756 | note that we can have data_length > 0 (used by some containers) */ | |
757 | padding = RTA_DATA(rta); | |
33125ac5 | 758 | } |
65f568bb | 759 | |
7ca1d319 TG |
760 | /* make sure also the padding at the end of the message is initialized */ |
761 | padding_length = (uint8_t*)m->hdr + message_length - (uint8_t*)padding; | |
762 | memzero(padding, padding_length); | |
763 | ||
4ebe732c ZJS |
764 | /* update message size */ |
765 | m->hdr->nlmsg_len = message_length; | |
766 | ||
7ca1d319 | 767 | return offset; |
65f568bb TG |
768 | } |
769 | ||
1c4baffc | 770 | static int message_attribute_has_type(sd_netlink_message *m, uint16_t attribute_type, uint16_t data_type) { |
d8e538ec TG |
771 | const NLType *type; |
772 | int r; | |
773 | ||
774 | r = type_system_get_type(m->container_type_system[m->n_containers], &type, attribute_type); | |
775 | if (r < 0) | |
776 | return r; | |
777 | ||
778 | if (type->type != data_type) | |
779 | return -EINVAL; | |
780 | ||
781 | return type->size; | |
782 | } | |
783 | ||
1c4baffc | 784 | int sd_netlink_message_append_string(sd_netlink_message *m, unsigned short type, const char *data) { |
d8e538ec | 785 | size_t length, size; |
0a0dc69b | 786 | int r; |
65f568bb TG |
787 | |
788 | assert_return(m, -EINVAL); | |
e5c4350b | 789 | assert_return(!m->sealed, -EPERM); |
65f568bb TG |
790 | assert_return(data, -EINVAL); |
791 | ||
d8e538ec | 792 | r = message_attribute_has_type(m, type, NLA_STRING); |
0a0dc69b TG |
793 | if (r < 0) |
794 | return r; | |
d8e538ec TG |
795 | else |
796 | size = (size_t)r; | |
65f568bb | 797 | |
d8e538ec | 798 | if (size) { |
3072eecf LP |
799 | length = strnlen(data, size+1); |
800 | if (length > size) | |
d8e538ec TG |
801 | return -EINVAL; |
802 | } else | |
803 | length = strlen(data); | |
33125ac5 | 804 | |
d8e538ec | 805 | r = add_rtattr(m, type, data, length + 1); |
0a0dc69b TG |
806 | if (r < 0) |
807 | return r; | |
808 | ||
809 | return 0; | |
810 | } | |
811 | ||
1c4baffc | 812 | int sd_netlink_message_append_u8(sd_netlink_message *m, unsigned short type, uint8_t data) { |
7b179640 SS |
813 | int r; |
814 | ||
815 | assert_return(m, -EINVAL); | |
816 | assert_return(!m->sealed, -EPERM); | |
817 | ||
d8e538ec | 818 | r = message_attribute_has_type(m, type, NLA_U8); |
7b179640 SS |
819 | if (r < 0) |
820 | return r; | |
821 | ||
7b179640 SS |
822 | r = add_rtattr(m, type, &data, sizeof(uint8_t)); |
823 | if (r < 0) | |
824 | return r; | |
825 | ||
826 | return 0; | |
827 | } | |
828 | ||
829 | ||
1c4baffc | 830 | int sd_netlink_message_append_u16(sd_netlink_message *m, unsigned short type, uint16_t data) { |
01b36069 TG |
831 | int r; |
832 | ||
833 | assert_return(m, -EINVAL); | |
e5c4350b | 834 | assert_return(!m->sealed, -EPERM); |
01b36069 | 835 | |
d8e538ec | 836 | r = message_attribute_has_type(m, type, NLA_U16); |
01b36069 TG |
837 | if (r < 0) |
838 | return r; | |
839 | ||
01b36069 TG |
840 | r = add_rtattr(m, type, &data, sizeof(uint16_t)); |
841 | if (r < 0) | |
842 | return r; | |
843 | ||
844 | return 0; | |
845 | } | |
846 | ||
1c4baffc | 847 | int sd_netlink_message_append_u32(sd_netlink_message *m, unsigned short type, uint32_t data) { |
0a0dc69b TG |
848 | int r; |
849 | ||
850 | assert_return(m, -EINVAL); | |
e5c4350b | 851 | assert_return(!m->sealed, -EPERM); |
0a0dc69b | 852 | |
d8e538ec | 853 | r = message_attribute_has_type(m, type, NLA_U32); |
0a0dc69b TG |
854 | if (r < 0) |
855 | return r; | |
856 | ||
4d47756b | 857 | r = add_rtattr(m, type, &data, sizeof(uint32_t)); |
0a0dc69b TG |
858 | if (r < 0) |
859 | return r; | |
860 | ||
861 | return 0; | |
862 | } | |
863 | ||
1c4baffc | 864 | int sd_netlink_message_append_in_addr(sd_netlink_message *m, unsigned short type, const struct in_addr *data) { |
0a0dc69b TG |
865 | int r; |
866 | ||
867 | assert_return(m, -EINVAL); | |
e5c4350b | 868 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
869 | assert_return(data, -EINVAL); |
870 | ||
d8e538ec | 871 | r = message_attribute_has_type(m, type, NLA_IN_ADDR); |
0a0dc69b TG |
872 | if (r < 0) |
873 | return r; | |
874 | ||
4d47756b | 875 | r = add_rtattr(m, type, data, sizeof(struct in_addr)); |
0a0dc69b TG |
876 | if (r < 0) |
877 | return r; | |
878 | ||
879 | return 0; | |
880 | } | |
881 | ||
1c4baffc | 882 | int sd_netlink_message_append_in6_addr(sd_netlink_message *m, unsigned short type, const struct in6_addr *data) { |
0a0dc69b TG |
883 | int r; |
884 | ||
885 | assert_return(m, -EINVAL); | |
e5c4350b | 886 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
887 | assert_return(data, -EINVAL); |
888 | ||
d8e538ec | 889 | r = message_attribute_has_type(m, type, NLA_IN_ADDR); |
0a0dc69b TG |
890 | if (r < 0) |
891 | return r; | |
892 | ||
4d47756b | 893 | r = add_rtattr(m, type, data, sizeof(struct in6_addr)); |
0a0dc69b TG |
894 | if (r < 0) |
895 | return r; | |
896 | ||
897 | return 0; | |
898 | } | |
899 | ||
1c4baffc | 900 | int sd_netlink_message_append_ether_addr(sd_netlink_message *m, unsigned short type, const struct ether_addr *data) { |
0a0dc69b TG |
901 | int r; |
902 | ||
903 | assert_return(m, -EINVAL); | |
e5c4350b | 904 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
905 | assert_return(data, -EINVAL); |
906 | ||
d8e538ec TG |
907 | r = message_attribute_has_type(m, type, NLA_ETHER_ADDR); |
908 | if (r < 0) | |
909 | return r; | |
0a0dc69b | 910 | |
b9eaf3d1 | 911 | r = add_rtattr(m, type, data, ETH_ALEN); |
0a0dc69b TG |
912 | if (r < 0) |
913 | return r; | |
914 | ||
915 | return 0; | |
65f568bb TG |
916 | } |
917 | ||
1c4baffc | 918 | int sd_netlink_message_append_cache_info(sd_netlink_message *m, unsigned short type, const struct ifa_cacheinfo *info) { |
aba496a5 UTL |
919 | int r; |
920 | ||
921 | assert_return(m, -EINVAL); | |
922 | assert_return(!m->sealed, -EPERM); | |
923 | assert_return(info, -EINVAL); | |
924 | ||
925 | r = message_attribute_has_type(m, type, NLA_CACHE_INFO); | |
926 | if (r < 0) | |
927 | return r; | |
928 | ||
929 | r = add_rtattr(m, type, info, sizeof(struct ifa_cacheinfo)); | |
930 | if (r < 0) | |
931 | return r; | |
932 | ||
933 | return 0; | |
934 | } | |
935 | ||
1c4baffc | 936 | int sd_netlink_message_open_container(sd_netlink_message *m, unsigned short type) { |
d8e538ec TG |
937 | size_t size; |
938 | int r; | |
33125ac5 | 939 | |
65f568bb | 940 | assert_return(m, -EINVAL); |
e5c4350b | 941 | assert_return(!m->sealed, -EPERM); |
7ca1d319 | 942 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -ERANGE); |
33125ac5 | 943 | |
d8e538ec | 944 | r = message_attribute_has_type(m, type, NLA_NESTED); |
4af7b60d TG |
945 | if (r < 0) { |
946 | const NLTypeSystemUnion *type_system_union; | |
947 | int family; | |
948 | ||
949 | r = message_attribute_has_type(m, type, NLA_UNION); | |
950 | if (r < 0) | |
951 | return r; | |
952 | size = (size_t) r; | |
953 | ||
1c4baffc | 954 | r = sd_netlink_message_get_family(m, &family); |
4af7b60d TG |
955 | if (r < 0) |
956 | return r; | |
957 | ||
958 | r = type_system_get_type_system_union(m->container_type_system[m->n_containers], &type_system_union, type); | |
959 | if (r < 0) | |
960 | return r; | |
961 | ||
962 | r = type_system_union_protocol_get_type_system(type_system_union, | |
963 | &m->container_type_system[m->n_containers + 1], | |
964 | family); | |
965 | if (r < 0) | |
966 | return r; | |
967 | } else { | |
d8e538ec | 968 | size = (size_t)r; |
33125ac5 | 969 | |
4af7b60d TG |
970 | r = type_system_get_type_system(m->container_type_system[m->n_containers], |
971 | &m->container_type_system[m->n_containers + 1], | |
972 | type); | |
973 | if (r < 0) | |
974 | return r; | |
975 | } | |
31a4e153 | 976 | |
fcf81a54 | 977 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, size); |
d8e538ec TG |
978 | if (r < 0) |
979 | return r; | |
980 | ||
7ca1d319 TG |
981 | m->container_offsets[m->n_containers ++] = r; |
982 | ||
d8e538ec TG |
983 | return 0; |
984 | } | |
985 | ||
1c4baffc | 986 | int sd_netlink_message_open_container_union(sd_netlink_message *m, unsigned short type, const char *key) { |
d8e538ec TG |
987 | const NLTypeSystemUnion *type_system_union; |
988 | int r; | |
989 | ||
990 | assert_return(m, -EINVAL); | |
991 | assert_return(!m->sealed, -EPERM); | |
992 | ||
993 | r = type_system_get_type_system_union(m->container_type_system[m->n_containers], &type_system_union, type); | |
994 | if (r < 0) | |
995 | return r; | |
996 | ||
997 | r = type_system_union_get_type_system(type_system_union, | |
998 | &m->container_type_system[m->n_containers + 1], | |
999 | key); | |
1000 | if (r < 0) | |
1001 | return r; | |
33125ac5 | 1002 | |
1c4baffc | 1003 | r = sd_netlink_message_append_string(m, type_system_union->match, key); |
d8e538ec TG |
1004 | if (r < 0) |
1005 | return r; | |
1006 | ||
1007 | /* do we evere need non-null size */ | |
1008 | r = add_rtattr(m, type, NULL, 0); | |
1009 | if (r < 0) | |
1010 | return r; | |
1011 | ||
7ca1d319 TG |
1012 | m->container_offsets[m->n_containers ++] = r; |
1013 | ||
d8e538ec | 1014 | return 0; |
33125ac5 TG |
1015 | } |
1016 | ||
d8e538ec | 1017 | |
1c4baffc | 1018 | int sd_netlink_message_close_container(sd_netlink_message *m) { |
33125ac5 | 1019 | assert_return(m, -EINVAL); |
e5c4350b | 1020 | assert_return(!m->sealed, -EPERM); |
5a081409 | 1021 | assert_return(m->n_containers > 0, -EINVAL); |
33125ac5 | 1022 | |
d8e538ec | 1023 | m->container_type_system[m->n_containers] = NULL; |
5a081409 | 1024 | m->n_containers --; |
33125ac5 TG |
1025 | |
1026 | return 0; | |
1027 | } | |
1028 | ||
1c4baffc | 1029 | int rtnl_message_read_internal(sd_netlink_message *m, unsigned short type, void **data) { |
f66eeb6b TG |
1030 | struct rtattr *rta; |
1031 | ||
44caa5e7 SS |
1032 | assert_return(m, -EINVAL); |
1033 | assert_return(m->sealed, -EPERM); | |
1034 | assert_return(data, -EINVAL); | |
d8e538ec TG |
1035 | assert(m->n_containers <= RTNL_CONTAINER_DEPTH); |
1036 | assert(m->rta_offset_tb[m->n_containers]); | |
1037 | assert(type < m->rta_tb_size[m->n_containers]); | |
44caa5e7 | 1038 | |
3dd215e0 | 1039 | if(!m->rta_offset_tb[m->n_containers][type]) |
44caa5e7 SS |
1040 | return -ENODATA; |
1041 | ||
3dd215e0 | 1042 | rta = (struct rtattr*)((uint8_t *) m->hdr + m->rta_offset_tb[m->n_containers][type]); |
44caa5e7 | 1043 | |
f66eeb6b TG |
1044 | *data = RTA_DATA(rta); |
1045 | ||
1046 | return RTA_PAYLOAD(rta); | |
44caa5e7 SS |
1047 | } |
1048 | ||
1c4baffc | 1049 | int sd_netlink_message_read_string(sd_netlink_message *m, unsigned short type, const char **data) { |
44caa5e7 SS |
1050 | int r; |
1051 | void *attr_data; | |
1052 | ||
73ae2b7d TG |
1053 | assert_return(m, -EINVAL); |
1054 | ||
d8e538ec TG |
1055 | r = message_attribute_has_type(m, type, NLA_STRING); |
1056 | if (r < 0) | |
1057 | return r; | |
44caa5e7 SS |
1058 | |
1059 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 1060 | if (r < 0) |
44caa5e7 | 1061 | return r; |
f66eeb6b TG |
1062 | else if (strnlen(attr_data, r) >= (size_t) r) |
1063 | return -EIO; | |
44caa5e7 | 1064 | |
73ae2b7d TG |
1065 | if (data) |
1066 | *data = (const char *) attr_data; | |
44caa5e7 SS |
1067 | |
1068 | return 0; | |
1069 | } | |
1070 | ||
1c4baffc | 1071 | int sd_netlink_message_read_u8(sd_netlink_message *m, unsigned short type, uint8_t *data) { |
44caa5e7 SS |
1072 | int r; |
1073 | void *attr_data; | |
1074 | ||
73ae2b7d TG |
1075 | assert_return(m, -EINVAL); |
1076 | ||
d8e538ec TG |
1077 | r = message_attribute_has_type(m, type, NLA_U8); |
1078 | if (r < 0) | |
1079 | return r; | |
44caa5e7 SS |
1080 | |
1081 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 1082 | if (r < 0) |
44caa5e7 | 1083 | return r; |
f66eeb6b TG |
1084 | else if ((size_t) r < sizeof(uint8_t)) |
1085 | return -EIO; | |
44caa5e7 | 1086 | |
73ae2b7d TG |
1087 | if (data) |
1088 | *data = *(uint8_t *) attr_data; | |
44caa5e7 SS |
1089 | |
1090 | return 0; | |
1091 | } | |
1092 | ||
1c4baffc | 1093 | int sd_netlink_message_read_u16(sd_netlink_message *m, unsigned short type, uint16_t *data) { |
44caa5e7 SS |
1094 | int r; |
1095 | void *attr_data; | |
1096 | ||
73ae2b7d TG |
1097 | assert_return(m, -EINVAL); |
1098 | ||
d8e538ec TG |
1099 | r = message_attribute_has_type(m, type, NLA_U16); |
1100 | if (r < 0) | |
1101 | return r; | |
44caa5e7 SS |
1102 | |
1103 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 1104 | if (r < 0) |
44caa5e7 | 1105 | return r; |
f66eeb6b TG |
1106 | else if ((size_t) r < sizeof(uint16_t)) |
1107 | return -EIO; | |
44caa5e7 | 1108 | |
73ae2b7d TG |
1109 | if (data) |
1110 | *data = *(uint16_t *) attr_data; | |
44caa5e7 SS |
1111 | |
1112 | return 0; | |
1113 | } | |
1114 | ||
1c4baffc | 1115 | int sd_netlink_message_read_u32(sd_netlink_message *m, unsigned short type, uint32_t *data) { |
44caa5e7 SS |
1116 | int r; |
1117 | void *attr_data; | |
1118 | ||
73ae2b7d TG |
1119 | assert_return(m, -EINVAL); |
1120 | ||
d8e538ec TG |
1121 | r = message_attribute_has_type(m, type, NLA_U32); |
1122 | if (r < 0) | |
1123 | return r; | |
44caa5e7 SS |
1124 | |
1125 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 1126 | if (r < 0) |
44caa5e7 | 1127 | return r; |
f66eeb6b TG |
1128 | else if ((size_t)r < sizeof(uint32_t)) |
1129 | return -EIO; | |
44caa5e7 | 1130 | |
73ae2b7d TG |
1131 | if (data) |
1132 | *data = *(uint32_t *) attr_data; | |
44caa5e7 SS |
1133 | |
1134 | return 0; | |
1135 | } | |
1136 | ||
1c4baffc | 1137 | int sd_netlink_message_read_ether_addr(sd_netlink_message *m, unsigned short type, struct ether_addr *data) { |
4e9e7f18 SS |
1138 | int r; |
1139 | void *attr_data; | |
1140 | ||
73ae2b7d TG |
1141 | assert_return(m, -EINVAL); |
1142 | ||
d8e538ec TG |
1143 | r = message_attribute_has_type(m, type, NLA_ETHER_ADDR); |
1144 | if (r < 0) | |
1145 | return r; | |
4e9e7f18 SS |
1146 | |
1147 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 1148 | if (r < 0) |
4e9e7f18 | 1149 | return r; |
f66eeb6b TG |
1150 | else if ((size_t)r < sizeof(struct ether_addr)) |
1151 | return -EIO; | |
4e9e7f18 | 1152 | |
73ae2b7d TG |
1153 | if (data) |
1154 | memcpy(data, attr_data, sizeof(struct ether_addr)); | |
4e9e7f18 SS |
1155 | |
1156 | return 0; | |
1157 | } | |
1158 | ||
1c4baffc | 1159 | int sd_netlink_message_read_cache_info(sd_netlink_message *m, unsigned short type, struct ifa_cacheinfo *info) { |
aba496a5 UTL |
1160 | int r; |
1161 | void *attr_data; | |
1162 | ||
73ae2b7d TG |
1163 | assert_return(m, -EINVAL); |
1164 | ||
aba496a5 UTL |
1165 | r = message_attribute_has_type(m, type, NLA_CACHE_INFO); |
1166 | if (r < 0) | |
1167 | return r; | |
1168 | ||
1169 | r = rtnl_message_read_internal(m, type, &attr_data); | |
1170 | if (r < 0) | |
1171 | return r; | |
1172 | else if ((size_t)r < sizeof(struct ifa_cacheinfo)) | |
1173 | return -EIO; | |
1174 | ||
73ae2b7d TG |
1175 | if (info) |
1176 | memcpy(info, attr_data, sizeof(struct ifa_cacheinfo)); | |
aba496a5 UTL |
1177 | |
1178 | return 0; | |
1179 | } | |
1180 | ||
1c4baffc | 1181 | int sd_netlink_message_read_in_addr(sd_netlink_message *m, unsigned short type, struct in_addr *data) { |
4e9e7f18 SS |
1182 | int r; |
1183 | void *attr_data; | |
1184 | ||
73ae2b7d TG |
1185 | assert_return(m, -EINVAL); |
1186 | ||
d8e538ec TG |
1187 | r = message_attribute_has_type(m, type, NLA_IN_ADDR); |
1188 | if (r < 0) | |
1189 | return r; | |
4e9e7f18 SS |
1190 | |
1191 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 1192 | if (r < 0) |
4e9e7f18 | 1193 | return r; |
f66eeb6b TG |
1194 | else if ((size_t)r < sizeof(struct in_addr)) |
1195 | return -EIO; | |
4e9e7f18 | 1196 | |
73ae2b7d TG |
1197 | if (data) |
1198 | memcpy(data, attr_data, sizeof(struct in_addr)); | |
4e9e7f18 SS |
1199 | |
1200 | return 0; | |
1201 | } | |
1202 | ||
1c4baffc | 1203 | int sd_netlink_message_read_in6_addr(sd_netlink_message *m, unsigned short type, struct in6_addr *data) { |
4e9e7f18 SS |
1204 | int r; |
1205 | void *attr_data; | |
1206 | ||
73ae2b7d TG |
1207 | assert_return(m, -EINVAL); |
1208 | ||
d8e538ec TG |
1209 | r = message_attribute_has_type(m, type, NLA_IN_ADDR); |
1210 | if (r < 0) | |
1211 | return r; | |
4e9e7f18 SS |
1212 | |
1213 | r = rtnl_message_read_internal(m, type, &attr_data); | |
3dd215e0 | 1214 | if (r < 0) |
4e9e7f18 | 1215 | return r; |
3dd215e0 TG |
1216 | else if ((size_t)r < sizeof(struct in6_addr)) |
1217 | return -EIO; | |
4e9e7f18 | 1218 | |
73ae2b7d TG |
1219 | if (data) |
1220 | memcpy(data, attr_data, sizeof(struct in6_addr)); | |
4e9e7f18 SS |
1221 | |
1222 | return 0; | |
1223 | } | |
1224 | ||
1c4baffc | 1225 | int sd_netlink_message_enter_container(sd_netlink_message *m, unsigned short type) { |
d8e538ec TG |
1226 | const NLType *nl_type; |
1227 | const NLTypeSystem *type_system; | |
3dd215e0 | 1228 | void *container; |
d8e538ec TG |
1229 | size_t size; |
1230 | int r; | |
3dd215e0 TG |
1231 | |
1232 | assert_return(m, -EINVAL); | |
1233 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -EINVAL); | |
1234 | ||
d8e538ec TG |
1235 | r = type_system_get_type(m->container_type_system[m->n_containers], |
1236 | &nl_type, | |
1237 | type); | |
3dd215e0 TG |
1238 | if (r < 0) |
1239 | return r; | |
3dd215e0 | 1240 | |
d8e538ec TG |
1241 | if (nl_type->type == NLA_NESTED) { |
1242 | r = type_system_get_type_system(m->container_type_system[m->n_containers], | |
1243 | &type_system, | |
1244 | type); | |
1245 | if (r < 0) | |
1246 | return r; | |
1247 | } else if (nl_type->type == NLA_UNION) { | |
1248 | const NLTypeSystemUnion *type_system_union; | |
d8e538ec TG |
1249 | |
1250 | r = type_system_get_type_system_union(m->container_type_system[m->n_containers], | |
1251 | &type_system_union, | |
1252 | type); | |
1253 | if (r < 0) | |
1254 | return r; | |
1255 | ||
4af7b60d TG |
1256 | switch (type_system_union->match_type) { |
1257 | case NL_MATCH_SIBLING: | |
1258 | { | |
1259 | const char *key; | |
1260 | ||
1c4baffc | 1261 | r = sd_netlink_message_read_string(m, type_system_union->match, &key); |
4af7b60d TG |
1262 | if (r < 0) |
1263 | return r; | |
1264 | ||
1265 | r = type_system_union_get_type_system(type_system_union, | |
1266 | &type_system, | |
1267 | key); | |
1268 | if (r < 0) | |
1269 | return r; | |
1270 | ||
1271 | break; | |
1272 | } | |
1273 | case NL_MATCH_PROTOCOL: | |
1274 | { | |
1275 | int family; | |
1276 | ||
1c4baffc | 1277 | r = sd_netlink_message_get_family(m, &family); |
4af7b60d TG |
1278 | if (r < 0) |
1279 | return r; | |
1280 | ||
1281 | r = type_system_union_protocol_get_type_system(type_system_union, | |
1282 | &type_system, | |
1283 | family); | |
1284 | if (r < 0) | |
1285 | return r; | |
1286 | ||
1287 | break; | |
1288 | } | |
1289 | default: | |
1c4baffc | 1290 | assert_not_reached("sd-netlink: invalid type system union type"); |
4af7b60d | 1291 | } |
d8e538ec TG |
1292 | } else |
1293 | return -EINVAL; | |
1294 | ||
1295 | r = rtnl_message_read_internal(m, type, &container); | |
3dd215e0 TG |
1296 | if (r < 0) |
1297 | return r; | |
d8e538ec TG |
1298 | else |
1299 | size = (size_t)r; | |
3dd215e0 | 1300 | |
d8e538ec | 1301 | m->n_containers ++; |
3dd215e0 TG |
1302 | |
1303 | r = rtnl_message_parse(m, | |
d8e538ec TG |
1304 | &m->rta_offset_tb[m->n_containers], |
1305 | &m->rta_tb_size[m->n_containers], | |
1306 | type_system->max, | |
3dd215e0 | 1307 | container, |
d8e538ec TG |
1308 | size); |
1309 | if (r < 0) { | |
1310 | m->n_containers --; | |
3dd215e0 | 1311 | return r; |
d8e538ec | 1312 | } |
3dd215e0 | 1313 | |
d8e538ec | 1314 | m->container_type_system[m->n_containers] = type_system; |
3dd215e0 TG |
1315 | |
1316 | return 0; | |
1317 | } | |
1318 | ||
1c4baffc | 1319 | int sd_netlink_message_exit_container(sd_netlink_message *m) { |
e5c4350b TG |
1320 | assert_return(m, -EINVAL); |
1321 | assert_return(m->sealed, -EINVAL); | |
1322 | assert_return(m->n_containers > 0, -EINVAL); | |
1323 | ||
3dd215e0 TG |
1324 | free(m->rta_offset_tb[m->n_containers]); |
1325 | m->rta_offset_tb[m->n_containers] = NULL; | |
d8e538ec | 1326 | m->container_type_system[m->n_containers] = NULL; |
3dd215e0 | 1327 | |
e5c4350b TG |
1328 | m->n_containers --; |
1329 | ||
1330 | return 0; | |
1331 | } | |
1332 | ||
1c4baffc | 1333 | uint32_t rtnl_message_get_serial(sd_netlink_message *m) { |
65f568bb | 1334 | assert(m); |
9d0db178 | 1335 | assert(m->hdr); |
65f568bb TG |
1336 | |
1337 | return m->hdr->nlmsg_seq; | |
1338 | } | |
1339 | ||
1c4baffc | 1340 | int sd_netlink_message_is_error(sd_netlink_message *m) { |
45af44d4 TG |
1341 | assert_return(m, 0); |
1342 | assert_return(m->hdr, 0); | |
1343 | ||
1344 | return m->hdr->nlmsg_type == NLMSG_ERROR; | |
1345 | } | |
1346 | ||
1c4baffc | 1347 | int sd_netlink_message_get_errno(sd_netlink_message *m) { |
65f568bb TG |
1348 | struct nlmsgerr *err; |
1349 | ||
e16bcf98 | 1350 | assert_return(m, -EINVAL); |
9d0db178 | 1351 | assert_return(m->hdr, -EINVAL); |
65f568bb | 1352 | |
1c4baffc | 1353 | if (!sd_netlink_message_is_error(m)) |
65f568bb TG |
1354 | return 0; |
1355 | ||
1356 | err = NLMSG_DATA(m->hdr); | |
1357 | ||
1358 | return err->error; | |
1359 | } | |
1360 | ||
1c4baffc | 1361 | int rtnl_message_parse(sd_netlink_message *m, |
44caa5e7 SS |
1362 | size_t **rta_offset_tb, |
1363 | unsigned short *rta_tb_size, | |
1364 | int max, | |
1365 | struct rtattr *rta, | |
1366 | unsigned int rt_len) { | |
e634cd40 | 1367 | unsigned short type; |
44caa5e7 SS |
1368 | size_t *tb; |
1369 | ||
c8a7165f | 1370 | tb = new0(size_t, max + 1); |
44caa5e7 SS |
1371 | if(!tb) |
1372 | return -ENOMEM; | |
1373 | ||
c8a7165f | 1374 | *rta_tb_size = max + 1; |
44caa5e7 SS |
1375 | |
1376 | for (; RTA_OK(rta, rt_len); rta = RTA_NEXT(rta, rt_len)) { | |
0a2478a9 | 1377 | type = RTA_TYPE(rta); |
44caa5e7 | 1378 | |
aef0768e TG |
1379 | /* if the kernel is newer than the headers we used |
1380 | when building, we ignore out-of-range attributes | |
1381 | */ | |
1382 | if (type > max) | |
e634cd40 | 1383 | continue; |
e634cd40 TG |
1384 | |
1385 | if (tb[type]) | |
1386 | log_debug("rtnl: message parse - overwriting repeated attribute"); | |
1387 | ||
1388 | tb[type] = (uint8_t *) rta - (uint8_t *) m->hdr; | |
44caa5e7 SS |
1389 | } |
1390 | ||
1391 | *rta_offset_tb = tb; | |
1392 | ||
1393 | return 0; | |
1394 | } | |
1395 | ||
65f568bb | 1396 | /* returns the number of bytes sent, or a negative error code */ |
1c4baffc | 1397 | int socket_write_message(sd_netlink *nl, sd_netlink_message *m) { |
d4bbdb77 TG |
1398 | union { |
1399 | struct sockaddr sa; | |
1400 | struct sockaddr_nl nl; | |
1401 | } addr = { | |
1402 | .nl.nl_family = AF_NETLINK, | |
1403 | }; | |
65f568bb TG |
1404 | ssize_t k; |
1405 | ||
9d0db178 TG |
1406 | assert(nl); |
1407 | assert(m); | |
1408 | assert(m->hdr); | |
65f568bb TG |
1409 | |
1410 | k = sendto(nl->fd, m->hdr, m->hdr->nlmsg_len, | |
d4bbdb77 | 1411 | 0, &addr.sa, sizeof(addr)); |
65f568bb | 1412 | if (k < 0) |
bbe181b4 | 1413 | return -errno; |
65f568bb TG |
1414 | |
1415 | return k; | |
1416 | } | |
1417 | ||
66269b05 | 1418 | static int socket_recv_message(int fd, struct iovec *iov, uint32_t *_group, bool peek) { |
2ce84835 TG |
1419 | union sockaddr_union sender; |
1420 | uint8_t cmsg_buffer[CMSG_SPACE(sizeof(struct nl_pktinfo))]; | |
bc078e71 | 1421 | struct msghdr msg = { |
26349add | 1422 | .msg_iov = iov, |
bc078e71 | 1423 | .msg_iovlen = 1, |
2ce84835 TG |
1424 | .msg_name = &sender, |
1425 | .msg_namelen = sizeof(sender), | |
1426 | .msg_control = cmsg_buffer, | |
1427 | .msg_controllen = sizeof(cmsg_buffer), | |
bc078e71 TG |
1428 | }; |
1429 | struct cmsghdr *cmsg; | |
66269b05 | 1430 | uint32_t group = 0; |
4e996881 | 1431 | int r; |
d4bbdb77 | 1432 | |
26349add TG |
1433 | assert(fd >= 0); |
1434 | assert(iov); | |
bc078e71 | 1435 | |
a38d9945 | 1436 | r = recvmsg(fd, &msg, MSG_TRUNC | (peek ? MSG_PEEK : 0)); |
5968b1c3 | 1437 | if (r < 0) { |
bc078e71 | 1438 | /* no data */ |
5968b1c3 TG |
1439 | if (errno == ENOBUFS) |
1440 | log_debug("rtnl: kernel receive buffer overrun"); | |
0b2bbbdf TG |
1441 | else if (errno == EAGAIN) |
1442 | log_debug("rtnl: no data in socket"); | |
5968b1c3 | 1443 | |
0b2bbbdf | 1444 | return (errno == EAGAIN || errno == EINTR) ? 0 : -errno; |
da53c551 | 1445 | } |
3dd215e0 | 1446 | |
2ce84835 | 1447 | if (sender.nl.nl_pid != 0) { |
bc078e71 | 1448 | /* not from the kernel, ignore */ |
2ce84835 TG |
1449 | log_debug("rtnl: ignoring message from portid %"PRIu32, sender.nl.nl_pid); |
1450 | ||
c7460cce TG |
1451 | if (peek) { |
1452 | /* drop the message */ | |
a38d9945 | 1453 | r = recvmsg(fd, &msg, 0); |
c7460cce TG |
1454 | if (r < 0) |
1455 | return (errno == EAGAIN || errno == EINTR) ? 0 : -errno; | |
1456 | } | |
1457 | ||
bc078e71 | 1458 | return 0; |
c7460cce | 1459 | } |
bc078e71 | 1460 | |
2ce84835 TG |
1461 | CMSG_FOREACH(cmsg, &msg) { |
1462 | if (cmsg->cmsg_level == SOL_NETLINK && | |
1463 | cmsg->cmsg_type == NETLINK_PKTINFO && | |
1464 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct nl_pktinfo))) { | |
1465 | struct nl_pktinfo *pktinfo = (void *)CMSG_DATA(cmsg); | |
1466 | ||
1467 | /* multi-cast group */ | |
1468 | group = pktinfo->group; | |
1469 | } | |
1470 | } | |
1471 | ||
0964dcd7 | 1472 | if (_group) |
66269b05 TG |
1473 | *_group = group; |
1474 | ||
26349add TG |
1475 | return r; |
1476 | } | |
1477 | ||
1478 | /* On success, the number of bytes received is returned and *ret points to the received message | |
1479 | * which has a valid header and the correct size. | |
1480 | * If nothing useful was received 0 is returned. | |
1481 | * On failure, a negative error code is returned. | |
1482 | */ | |
1c4baffc TG |
1483 | int socket_read_message(sd_netlink *rtnl) { |
1484 | _cleanup_netlink_message_unref_ sd_netlink_message *first = NULL; | |
26349add | 1485 | struct iovec iov = {}; |
66269b05 | 1486 | uint32_t group = 0; |
26349add TG |
1487 | bool multi_part = false, done = false; |
1488 | struct nlmsghdr *new_msg; | |
1489 | size_t len; | |
1490 | int r; | |
1491 | unsigned i = 0; | |
1492 | ||
1493 | assert(rtnl); | |
1494 | assert(rtnl->rbuffer); | |
1495 | assert(rtnl->rbuffer_allocated >= sizeof(struct nlmsghdr)); | |
1496 | ||
1497 | /* read nothing, just get the pending message size */ | |
0964dcd7 | 1498 | r = socket_recv_message(rtnl->fd, &iov, NULL, true); |
26349add TG |
1499 | if (r <= 0) |
1500 | return r; | |
1501 | else | |
1502 | len = (size_t)r; | |
1503 | ||
1504 | /* make room for the pending message */ | |
1505 | if (!greedy_realloc((void **)&rtnl->rbuffer, | |
1506 | &rtnl->rbuffer_allocated, | |
1507 | len, sizeof(uint8_t))) | |
1508 | return -ENOMEM; | |
1509 | ||
1510 | iov.iov_base = rtnl->rbuffer; | |
1511 | iov.iov_len = rtnl->rbuffer_allocated; | |
1512 | ||
1513 | /* read the pending message */ | |
66269b05 | 1514 | r = socket_recv_message(rtnl->fd, &iov, &group, false); |
26349add TG |
1515 | if (r <= 0) |
1516 | return r; | |
1517 | else | |
1518 | len = (size_t)r; | |
1519 | ||
127dc4ea TG |
1520 | if (len > rtnl->rbuffer_allocated) |
1521 | /* message did not fit in read buffer */ | |
1522 | return -EIO; | |
1523 | ||
4e996881 TG |
1524 | if (NLMSG_OK(rtnl->rbuffer, len) && rtnl->rbuffer->nlmsg_flags & NLM_F_MULTI) { |
1525 | multi_part = true; | |
1526 | ||
1527 | for (i = 0; i < rtnl->rqueue_partial_size; i++) { | |
1528 | if (rtnl_message_get_serial(rtnl->rqueue_partial[i]) == | |
1529 | rtnl->rbuffer->nlmsg_seq) { | |
1530 | first = rtnl->rqueue_partial[i]; | |
1531 | break; | |
1532 | } | |
1533 | } | |
1534 | } | |
1535 | ||
0e707326 | 1536 | for (new_msg = rtnl->rbuffer; NLMSG_OK(new_msg, len) && !done; new_msg = NLMSG_NEXT(new_msg, len)) { |
1c4baffc | 1537 | _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL; |
1b89cf56 | 1538 | const NLType *nl_type; |
3dd215e0 | 1539 | |
8fe65c03 | 1540 | if (!group && new_msg->nlmsg_pid != rtnl->sockaddr.nl.nl_pid) |
1b89cf56 TG |
1541 | /* not broadcast and not for us */ |
1542 | continue; | |
3dd215e0 | 1543 | |
1b89cf56 | 1544 | if (new_msg->nlmsg_type == NLMSG_NOOP) |
4e996881 | 1545 | /* silently drop noop messages */ |
1b89cf56 | 1546 | continue; |
bdd13f6b | 1547 | |
4e996881 TG |
1548 | if (new_msg->nlmsg_type == NLMSG_DONE) { |
1549 | /* finished reading multi-part message */ | |
1550 | done = true; | |
0e707326 | 1551 | |
ea342a99 AR |
1552 | /* if first is not defined, put NLMSG_DONE into the receive queue. */ |
1553 | if (first) | |
1554 | continue; | |
4e996881 | 1555 | } |
1403f45a | 1556 | |
1b89cf56 TG |
1557 | /* check that we support this message type */ |
1558 | r = type_system_get_type(NULL, &nl_type, new_msg->nlmsg_type); | |
1559 | if (r < 0) { | |
15411c0c | 1560 | if (r == -EOPNOTSUPP) |
1c4baffc | 1561 | log_debug("sd-netlink: ignored message with unknown type: %i", |
1b89cf56 | 1562 | new_msg->nlmsg_type); |
d8e538ec | 1563 | |
1b89cf56 TG |
1564 | continue; |
1565 | } | |
bdd13f6b | 1566 | |
1b89cf56 | 1567 | /* check that the size matches the message type */ |
64918838 | 1568 | if (new_msg->nlmsg_len < NLMSG_LENGTH(nl_type->size)) { |
1c4baffc | 1569 | log_debug("sd-netlink: message larger than expected, dropping"); |
1b89cf56 | 1570 | continue; |
64918838 | 1571 | } |
65f568bb | 1572 | |
1b89cf56 TG |
1573 | r = message_new_empty(rtnl, &m); |
1574 | if (r < 0) | |
1575 | return r; | |
1576 | ||
3f42446d TG |
1577 | m->broadcast = !!group; |
1578 | ||
1b89cf56 TG |
1579 | m->hdr = memdup(new_msg, new_msg->nlmsg_len); |
1580 | if (!m->hdr) | |
1581 | return -ENOMEM; | |
1582 | ||
1583 | /* seal and parse the top-level message */ | |
1c4baffc | 1584 | r = sd_netlink_message_rewind(m); |
1b89cf56 TG |
1585 | if (r < 0) |
1586 | return r; | |
1587 | ||
4e996881 TG |
1588 | /* push the message onto the multi-part message stack */ |
1589 | if (first) | |
1590 | m->next = first; | |
1591 | first = m; | |
1b89cf56 | 1592 | m = NULL; |
4e996881 | 1593 | } |
1403f45a | 1594 | |
4e996881 | 1595 | if (len) |
1c4baffc | 1596 | log_debug("sd-netlink: discarding %zu bytes of incoming message", len); |
1b89cf56 | 1597 | |
4e996881 TG |
1598 | if (!first) |
1599 | return 0; | |
65f568bb | 1600 | |
4e996881 TG |
1601 | if (!multi_part || done) { |
1602 | /* we got a complete message, push it on the read queue */ | |
24a02673 TG |
1603 | r = rtnl_rqueue_make_room(rtnl); |
1604 | if (r < 0) | |
1605 | return r; | |
1606 | ||
d4ef4f46 TG |
1607 | rtnl->rqueue[rtnl->rqueue_size ++] = first; |
1608 | first = NULL; | |
1609 | ||
1610 | if (multi_part && (i < rtnl->rqueue_partial_size)) { | |
4e996881 TG |
1611 | /* remove the message form the partial read queue */ |
1612 | memmove(rtnl->rqueue_partial + i,rtnl->rqueue_partial + i + 1, | |
1c4baffc | 1613 | sizeof(sd_netlink_message*) * (rtnl->rqueue_partial_size - i - 1)); |
4e996881 TG |
1614 | rtnl->rqueue_partial_size --; |
1615 | } | |
1616 | ||
4e996881 TG |
1617 | return 1; |
1618 | } else { | |
1619 | /* we only got a partial multi-part message, push it on the | |
1620 | partial read queue */ | |
1621 | if (i < rtnl->rqueue_partial_size) { | |
1622 | rtnl->rqueue_partial[i] = first; | |
1623 | } else { | |
1624 | r = rtnl_rqueue_partial_make_room(rtnl); | |
1625 | if (r < 0) | |
1626 | return r; | |
1627 | ||
1628 | rtnl->rqueue_partial[rtnl->rqueue_partial_size ++] = first; | |
1629 | } | |
1630 | first = NULL; | |
1403f45a | 1631 | |
4e996881 TG |
1632 | return 0; |
1633 | } | |
65f568bb | 1634 | } |
0fc7531b | 1635 | |
1c4baffc | 1636 | int sd_netlink_message_rewind(sd_netlink_message *m) { |
d8e538ec | 1637 | const NLType *type; |
3dd215e0 TG |
1638 | unsigned i; |
1639 | int r; | |
0fc7531b TG |
1640 | |
1641 | assert_return(m, -EINVAL); | |
0fc7531b | 1642 | |
3dd215e0 TG |
1643 | /* don't allow appending to message once parsed */ |
1644 | if (!m->sealed) | |
1645 | rtnl_message_seal(m); | |
1646 | ||
1647 | for (i = 1; i <= m->n_containers; i++) { | |
1648 | free(m->rta_offset_tb[i]); | |
1649 | m->rta_offset_tb[i] = NULL; | |
1650 | m->rta_tb_size[i] = 0; | |
d8e538ec | 1651 | m->container_type_system[i] = NULL; |
3dd215e0 TG |
1652 | } |
1653 | ||
1654 | m->n_containers = 0; | |
1655 | ||
1656 | if (m->rta_offset_tb[0]) { | |
1657 | /* top-level attributes have already been parsed */ | |
1658 | return 0; | |
1659 | } | |
1660 | ||
d8e538ec TG |
1661 | assert(m->hdr); |
1662 | ||
1663 | r = type_system_get_type(NULL, &type, m->hdr->nlmsg_type); | |
1664 | if (r < 0) | |
1665 | return r; | |
1666 | ||
1667 | if (type->type == NLA_NESTED) { | |
1668 | const NLTypeSystem *type_system = type->type_system; | |
1669 | ||
1670 | assert(type_system); | |
1671 | ||
1672 | m->container_type_system[0] = type_system; | |
1673 | ||
1674 | r = rtnl_message_parse(m, | |
1675 | &m->rta_offset_tb[m->n_containers], | |
1676 | &m->rta_tb_size[m->n_containers], | |
1677 | type_system->max, | |
0834ff93 TG |
1678 | (struct rtattr*)((uint8_t*)NLMSG_DATA(m->hdr) + |
1679 | NLMSG_ALIGN(type->size)), | |
d8e538ec TG |
1680 | NLMSG_PAYLOAD(m->hdr, type->size)); |
1681 | if (r < 0) | |
1682 | return r; | |
0fc7531b TG |
1683 | } |
1684 | ||
1685 | return 0; | |
1686 | } | |
3dd215e0 | 1687 | |
1c4baffc | 1688 | void rtnl_message_seal(sd_netlink_message *m) { |
3dd215e0 TG |
1689 | assert(m); |
1690 | assert(!m->sealed); | |
1691 | ||
1692 | m->sealed = true; | |
1693 | } | |
1403f45a | 1694 | |
1c4baffc | 1695 | sd_netlink_message *sd_netlink_message_next(sd_netlink_message *m) { |
1403f45a TG |
1696 | assert_return(m, NULL); |
1697 | ||
1698 | return m->next; | |
1699 | } |