]>
Commit | Line | Data |
---|---|---|
65f568bb TG |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Tom Gundersen <teg@jklm.no> | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <netinet/in.h> | |
23 | #include <netinet/ether.h> | |
24 | #include <stdbool.h> | |
25 | #include <unistd.h> | |
d8e538ec | 26 | #include <linux/netlink.h> |
31a4e153 | 27 | #include <linux/veth.h> |
9a6704a8 SS |
28 | #include <linux/if.h> |
29 | #include <linux/ip.h> | |
30 | #include <linux/if_tunnel.h> | |
3dd215e0 | 31 | #include <linux/if_bridge.h> |
65f568bb TG |
32 | |
33 | #include "util.h" | |
34 | #include "refcnt.h" | |
d5eff740 | 35 | #include "missing.h" |
65f568bb TG |
36 | |
37 | #include "sd-rtnl.h" | |
3815f36f | 38 | #include "rtnl-util.h" |
65f568bb | 39 | #include "rtnl-internal.h" |
d8e538ec | 40 | #include "rtnl-types.h" |
65f568bb | 41 | |
31a4e153 | 42 | #define GET_CONTAINER(m, i) ((i) < (m)->n_containers ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->container_offsets[i]) : NULL) |
e5c4350b | 43 | #define PUSH_CONTAINER(m, new) (m)->container_offsets[(m)->n_containers ++] = (uint8_t*)(new) - (uint8_t*)(m)->hdr; |
4ebe732c | 44 | |
1b89cf56 | 45 | static int message_new_empty(sd_rtnl *rtnl, sd_rtnl_message **ret) { |
65f568bb TG |
46 | sd_rtnl_message *m; |
47 | ||
48 | assert_return(ret, -EINVAL); | |
65f568bb | 49 | |
8c578303 TG |
50 | /* Note that 'rtnl' is curretly unused, if we start using it internally |
51 | we must take care to avoid problems due to mutual references between | |
52 | busses and their queued messages. See sd-bus. | |
53 | */ | |
54 | ||
65f568bb TG |
55 | m = new0(sd_rtnl_message, 1); |
56 | if (!m) | |
57 | return -ENOMEM; | |
58 | ||
65f568bb TG |
59 | m->n_ref = REFCNT_INIT; |
60 | ||
65f568bb TG |
61 | m->sealed = false; |
62 | ||
63 | *ret = m; | |
64 | ||
65 | return 0; | |
66 | } | |
67 | ||
d8e538ec | 68 | int message_new(sd_rtnl *rtnl, sd_rtnl_message **ret, uint16_t type) { |
1b89cf56 | 69 | _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL; |
d8e538ec TG |
70 | const NLType *nl_type; |
71 | size_t size; | |
72 | int r; | |
73 | ||
74 | r = type_system_get_type(NULL, &nl_type, type); | |
75 | if (r < 0) | |
76 | return r; | |
77 | ||
78 | assert(nl_type->type == NLA_NESTED); | |
79 | ||
1b89cf56 | 80 | r = message_new_empty(rtnl, &m); |
d8e538ec TG |
81 | if (r < 0) |
82 | return r; | |
83 | ||
1b89cf56 TG |
84 | size = NLMSG_SPACE(nl_type->size); |
85 | ||
86 | assert(size >= sizeof(struct nlmsghdr)); | |
87 | m->hdr = malloc0(size); | |
88 | if (!m->hdr) | |
89 | return -ENOMEM; | |
90 | ||
91 | m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; | |
92 | ||
93 | m->container_type_system[0] = nl_type->type_system; | |
94 | m->hdr->nlmsg_len = size; | |
95 | m->hdr->nlmsg_type = type; | |
96 | ||
97 | *ret = m; | |
98 | m = NULL; | |
d8e538ec TG |
99 | |
100 | return 0; | |
101 | } | |
102 | ||
1f01fb4f TG |
103 | int sd_rtnl_message_route_set_dst_prefixlen(sd_rtnl_message *m, unsigned char prefixlen) { |
104 | struct rtmsg *rtm; | |
105 | ||
5a723174 TG |
106 | assert_return(m, -EINVAL); |
107 | assert_return(m->hdr, -EINVAL); | |
3815f36f | 108 | assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); |
5a723174 | 109 | |
1f01fb4f TG |
110 | rtm = NLMSG_DATA(m->hdr); |
111 | ||
5a723174 TG |
112 | if ((rtm->rtm_family == AF_INET && prefixlen > 32) || |
113 | (rtm->rtm_family == AF_INET6 && prefixlen > 128)) | |
114 | return -ERANGE; | |
115 | ||
1f01fb4f TG |
116 | rtm->rtm_dst_len = prefixlen; |
117 | ||
5c1d3fc9 UTL |
118 | return 0; |
119 | } | |
120 | ||
121 | int sd_rtnl_message_route_set_scope(sd_rtnl_message *m, unsigned char scope) { | |
122 | struct rtmsg *rtm; | |
123 | ||
124 | assert_return(m, -EINVAL); | |
125 | assert_return(m->hdr, -EINVAL); | |
126 | assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL); | |
127 | ||
128 | rtm = NLMSG_DATA(m->hdr); | |
129 | ||
130 | rtm->rtm_scope = scope; | |
131 | ||
1f01fb4f TG |
132 | return 0; |
133 | } | |
134 | ||
151b9b96 LP |
135 | int sd_rtnl_message_new_route(sd_rtnl *rtnl, sd_rtnl_message **ret, |
136 | uint16_t nlmsg_type, unsigned char rtm_family) { | |
03d7e632 TG |
137 | struct rtmsg *rtm; |
138 | int r; | |
139 | ||
3815f36f | 140 | assert_return(rtnl_message_type_is_route(nlmsg_type), -EINVAL); |
1f01fb4f | 141 | assert_return(rtm_family == AF_INET || rtm_family == AF_INET6, -EINVAL); |
03d7e632 TG |
142 | assert_return(ret, -EINVAL); |
143 | ||
d8e538ec | 144 | r = message_new(rtnl, ret, nlmsg_type); |
03d7e632 TG |
145 | if (r < 0) |
146 | return r; | |
147 | ||
03d7e632 TG |
148 | if (nlmsg_type == RTM_NEWROUTE) |
149 | (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL; | |
150 | ||
151 | rtm = NLMSG_DATA((*ret)->hdr); | |
152 | ||
153 | rtm->rtm_family = rtm_family; | |
1f01fb4f TG |
154 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; |
155 | rtm->rtm_type = RTN_UNICAST; | |
156 | rtm->rtm_table = RT_TABLE_MAIN; | |
157 | rtm->rtm_protocol = RTPROT_BOOT; | |
03d7e632 TG |
158 | |
159 | return 0; | |
160 | } | |
161 | ||
5d4795f3 | 162 | int sd_rtnl_message_link_set_flags(sd_rtnl_message *m, unsigned flags, unsigned change) { |
fc25d7f8 TG |
163 | struct ifinfomsg *ifi; |
164 | ||
5a723174 TG |
165 | assert_return(m, -EINVAL); |
166 | assert_return(m->hdr, -EINVAL); | |
3815f36f | 167 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); |
a7b74db6 | 168 | assert_return(change, -EINVAL); |
5a723174 | 169 | |
fc25d7f8 TG |
170 | ifi = NLMSG_DATA(m->hdr); |
171 | ||
172 | ifi->ifi_flags = flags; | |
a7b74db6 | 173 | ifi->ifi_change = change; |
fc25d7f8 TG |
174 | |
175 | return 0; | |
176 | } | |
177 | ||
178 | int sd_rtnl_message_link_set_type(sd_rtnl_message *m, unsigned type) { | |
179 | struct ifinfomsg *ifi; | |
180 | ||
5a723174 TG |
181 | assert_return(m, -EINVAL); |
182 | assert_return(m->hdr, -EINVAL); | |
3815f36f | 183 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); |
5a723174 | 184 | |
fc25d7f8 TG |
185 | ifi = NLMSG_DATA(m->hdr); |
186 | ||
187 | ifi->ifi_type = type; | |
188 | ||
189 | return 0; | |
190 | } | |
191 | ||
151b9b96 LP |
192 | int sd_rtnl_message_new_link(sd_rtnl *rtnl, sd_rtnl_message **ret, |
193 | uint16_t nlmsg_type, int index) { | |
65f568bb TG |
194 | struct ifinfomsg *ifi; |
195 | int r; | |
196 | ||
3815f36f | 197 | assert_return(rtnl_message_type_is_link(nlmsg_type), -EINVAL); |
6a8402d9 | 198 | assert_return(nlmsg_type != RTM_DELLINK || index > 0, -EINVAL); |
65f568bb TG |
199 | assert_return(ret, -EINVAL); |
200 | ||
d8e538ec | 201 | r = message_new(rtnl, ret, nlmsg_type); |
65f568bb TG |
202 | if (r < 0) |
203 | return r; | |
204 | ||
33125ac5 | 205 | if (nlmsg_type == RTM_NEWLINK) |
6a8402d9 | 206 | (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL; |
65f568bb | 207 | |
dabfa9d1 | 208 | ifi = NLMSG_DATA((*ret)->hdr); |
65f568bb TG |
209 | |
210 | ifi->ifi_family = AF_UNSPEC; | |
211 | ifi->ifi_index = index; | |
65f568bb TG |
212 | |
213 | return 0; | |
214 | } | |
215 | ||
5a723174 TG |
216 | int sd_rtnl_message_addr_set_prefixlen(sd_rtnl_message *m, unsigned char prefixlen) { |
217 | struct ifaddrmsg *ifa; | |
218 | ||
219 | assert_return(m, -EINVAL); | |
220 | assert_return(m->hdr, -EINVAL); | |
3815f36f | 221 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); |
5a723174 TG |
222 | |
223 | ifa = NLMSG_DATA(m->hdr); | |
224 | ||
225 | if ((ifa->ifa_family == AF_INET && prefixlen > 32) || | |
226 | (ifa->ifa_family == AF_INET6 && prefixlen > 128)) | |
227 | return -ERANGE; | |
228 | ||
229 | ifa->ifa_prefixlen = prefixlen; | |
230 | ||
231 | return 0; | |
232 | } | |
233 | ||
234 | int sd_rtnl_message_addr_set_flags(sd_rtnl_message *m, unsigned char flags) { | |
235 | struct ifaddrmsg *ifa; | |
236 | ||
237 | assert_return(m, -EINVAL); | |
238 | assert_return(m->hdr, -EINVAL); | |
3815f36f | 239 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); |
5a723174 TG |
240 | |
241 | ifa = NLMSG_DATA(m->hdr); | |
242 | ||
243 | ifa->ifa_flags = flags; | |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
248 | int sd_rtnl_message_addr_set_scope(sd_rtnl_message *m, unsigned char scope) { | |
249 | struct ifaddrmsg *ifa; | |
250 | ||
251 | assert_return(m, -EINVAL); | |
252 | assert_return(m->hdr, -EINVAL); | |
3815f36f | 253 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); |
5a723174 TG |
254 | |
255 | ifa = NLMSG_DATA(m->hdr); | |
256 | ||
257 | ifa->ifa_scope = scope; | |
258 | ||
259 | return 0; | |
260 | } | |
261 | ||
e00d77dd TG |
262 | int sd_rtnl_message_addr_get_family(sd_rtnl_message *m, unsigned char *family) { |
263 | struct ifaddrmsg *ifa; | |
264 | ||
265 | assert_return(m, -EINVAL); | |
266 | assert_return(m->hdr, -EINVAL); | |
267 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
268 | assert_return(family, -EINVAL); | |
269 | ||
270 | ifa = NLMSG_DATA(m->hdr); | |
271 | ||
272 | *family = ifa->ifa_family; | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
277 | int sd_rtnl_message_addr_get_scope(sd_rtnl_message *m, unsigned char *scope) { | |
278 | struct ifaddrmsg *ifa; | |
279 | ||
280 | assert_return(m, -EINVAL); | |
281 | assert_return(m->hdr, -EINVAL); | |
282 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
283 | assert_return(scope, -EINVAL); | |
284 | ||
285 | ifa = NLMSG_DATA(m->hdr); | |
286 | ||
287 | *scope = ifa->ifa_scope; | |
288 | ||
289 | return 0; | |
290 | } | |
291 | ||
292 | int sd_rtnl_message_addr_get_flags(sd_rtnl_message *m, unsigned char *flags) { | |
293 | struct ifaddrmsg *ifa; | |
294 | ||
295 | assert_return(m, -EINVAL); | |
296 | assert_return(m->hdr, -EINVAL); | |
297 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
298 | assert_return(flags, -EINVAL); | |
299 | ||
300 | ifa = NLMSG_DATA(m->hdr); | |
301 | ||
302 | *flags = ifa->ifa_flags; | |
303 | ||
304 | return 0; | |
305 | } | |
306 | ||
307 | int sd_rtnl_message_addr_get_ifindex(sd_rtnl_message *m, int *ifindex) { | |
308 | struct ifaddrmsg *ifa; | |
309 | ||
310 | assert_return(m, -EINVAL); | |
311 | assert_return(m->hdr, -EINVAL); | |
312 | assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL); | |
313 | assert_return(ifindex, -EINVAL); | |
314 | ||
315 | ifa = NLMSG_DATA(m->hdr); | |
316 | ||
317 | *ifindex = ifa->ifa_index; | |
318 | ||
319 | return 0; | |
320 | } | |
321 | ||
151b9b96 LP |
322 | int sd_rtnl_message_new_addr(sd_rtnl *rtnl, sd_rtnl_message **ret, |
323 | uint16_t nlmsg_type, int index, | |
324 | unsigned char family) { | |
65f568bb TG |
325 | struct ifaddrmsg *ifa; |
326 | int r; | |
327 | ||
3815f36f | 328 | assert_return(rtnl_message_type_is_addr(nlmsg_type), -EINVAL); |
b9ef681b TG |
329 | assert_return((nlmsg_type == RTM_GETADDR && index == 0) || |
330 | index > 0, -EINVAL); | |
331 | assert_return((nlmsg_type == RTM_GETADDR && family == AF_UNSPEC) || | |
332 | family == AF_INET || family == AF_INET6, -EINVAL); | |
65f568bb TG |
333 | assert_return(ret, -EINVAL); |
334 | ||
d8e538ec | 335 | r = message_new(rtnl, ret, nlmsg_type); |
65f568bb TG |
336 | if (r < 0) |
337 | return r; | |
338 | ||
b9ef681b | 339 | if (nlmsg_type == RTM_GETADDR) |
818dc5e7 | 340 | (*ret)->hdr->nlmsg_flags |= NLM_F_DUMP; |
65f568bb | 341 | |
dabfa9d1 | 342 | ifa = NLMSG_DATA((*ret)->hdr); |
65f568bb | 343 | |
65f568bb | 344 | ifa->ifa_index = index; |
5a723174 TG |
345 | ifa->ifa_family = family; |
346 | if (family == AF_INET) | |
347 | ifa->ifa_prefixlen = 32; | |
348 | else if (family == AF_INET6) | |
349 | ifa->ifa_prefixlen = 128; | |
65f568bb TG |
350 | |
351 | return 0; | |
352 | } | |
353 | ||
aba496a5 UTL |
354 | int sd_rtnl_message_new_addr_update(sd_rtnl *rtnl, sd_rtnl_message **ret, |
355 | int index, unsigned char family) { | |
356 | int r; | |
357 | ||
358 | r = sd_rtnl_message_new_addr(rtnl, ret, RTM_NEWADDR, index, family); | |
359 | if (r < 0) | |
360 | return r; | |
361 | ||
362 | (*ret)->hdr->nlmsg_flags |= NLM_F_REPLACE; | |
363 | ||
364 | return 0; | |
365 | } | |
366 | ||
65f568bb TG |
367 | sd_rtnl_message *sd_rtnl_message_ref(sd_rtnl_message *m) { |
368 | if (m) | |
369 | assert_se(REFCNT_INC(m->n_ref) >= 2); | |
370 | ||
371 | return m; | |
372 | } | |
373 | ||
374 | sd_rtnl_message *sd_rtnl_message_unref(sd_rtnl_message *m) { | |
375 | if (m && REFCNT_DEC(m->n_ref) <= 0) { | |
3dd215e0 TG |
376 | unsigned i; |
377 | ||
65f568bb | 378 | free(m->hdr); |
3dd215e0 | 379 | |
9f5bbfe3 | 380 | for (i = 0; i <= m->n_containers; i++) |
3dd215e0 TG |
381 | free(m->rta_offset_tb[i]); |
382 | ||
1403f45a TG |
383 | sd_rtnl_message_unref(m->next); |
384 | ||
65f568bb TG |
385 | free(m); |
386 | } | |
387 | ||
388 | return NULL; | |
389 | } | |
390 | ||
dabfa9d1 | 391 | int sd_rtnl_message_get_type(sd_rtnl_message *m, uint16_t *type) { |
65f568bb TG |
392 | assert_return(m, -EINVAL); |
393 | assert_return(type, -EINVAL); | |
394 | ||
395 | *type = m->hdr->nlmsg_type; | |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
1f0db3ed TG |
400 | int sd_rtnl_message_is_broadcast(sd_rtnl_message *m) { |
401 | assert_return(m, -EINVAL); | |
402 | ||
403 | return !m->hdr->nlmsg_pid; | |
404 | } | |
405 | ||
33125ac5 TG |
406 | int sd_rtnl_message_link_get_ifindex(sd_rtnl_message *m, int *ifindex) { |
407 | struct ifinfomsg *ifi; | |
408 | ||
409 | assert_return(m, -EINVAL); | |
9d0db178 | 410 | assert_return(m->hdr, -EINVAL); |
3815f36f | 411 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); |
33125ac5 | 412 | assert_return(ifindex, -EINVAL); |
33125ac5 TG |
413 | |
414 | ifi = NLMSG_DATA(m->hdr); | |
415 | ||
416 | *ifindex = ifi->ifi_index; | |
417 | ||
418 | return 0; | |
419 | } | |
420 | ||
50b3c42f TG |
421 | int sd_rtnl_message_link_get_flags(sd_rtnl_message *m, unsigned *flags) { |
422 | struct ifinfomsg *ifi; | |
423 | ||
424 | assert_return(m, -EINVAL); | |
9d0db178 | 425 | assert_return(m->hdr, -EINVAL); |
3815f36f | 426 | assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL); |
50b3c42f | 427 | assert_return(flags, -EINVAL); |
50b3c42f TG |
428 | |
429 | ifi = NLMSG_DATA(m->hdr); | |
430 | ||
431 | *flags = ifi->ifi_flags; | |
432 | ||
433 | return 0; | |
434 | } | |
435 | ||
4ebe732c ZJS |
436 | /* If successful the updated message will be correctly aligned, if |
437 | unsuccessful the old message is untouched. */ | |
65f568bb | 438 | static int add_rtattr(sd_rtnl_message *m, unsigned short type, const void *data, size_t data_length) { |
dabfa9d1 | 439 | uint32_t rta_length, message_length; |
65f568bb TG |
440 | struct nlmsghdr *new_hdr; |
441 | struct rtattr *rta; | |
8e337e64 | 442 | char *padding; |
5a081409 | 443 | unsigned i; |
65f568bb | 444 | |
33125ac5 TG |
445 | assert(m); |
446 | assert(m->hdr); | |
e5c4350b | 447 | assert(!m->sealed); |
33125ac5 TG |
448 | assert(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len); |
449 | assert(!data || data_length > 0); | |
5a081409 | 450 | assert(data || m->n_containers < RTNL_CONTAINER_DEPTH); |
65f568bb | 451 | |
8e337e64 | 452 | /* get the size of the new rta attribute (with padding at the end) */ |
65f568bb | 453 | rta_length = RTA_LENGTH(data_length); |
4ebe732c ZJS |
454 | |
455 | /* get the new message size (with padding at the end) */ | |
65f568bb TG |
456 | message_length = m->hdr->nlmsg_len + RTA_ALIGN(rta_length); |
457 | ||
458 | /* realloc to fit the new attribute */ | |
459 | new_hdr = realloc(m->hdr, message_length); | |
460 | if (!new_hdr) | |
461 | return -ENOMEM; | |
462 | m->hdr = new_hdr; | |
463 | ||
464 | /* get pointer to the attribute we are about to add */ | |
465 | rta = (struct rtattr *) ((uint8_t *) m->hdr + m->hdr->nlmsg_len); | |
65f568bb | 466 | |
5a081409 TG |
467 | /* if we are inside containers, extend them */ |
468 | for (i = 0; i < m->n_containers; i++) | |
469 | GET_CONTAINER(m, i)->rta_len += message_length - m->hdr->nlmsg_len; | |
33125ac5 | 470 | |
65f568bb TG |
471 | /* fill in the attribute */ |
472 | rta->rta_type = type; | |
473 | rta->rta_len = rta_length; | |
33125ac5 | 474 | if (!data) { |
d8e538ec | 475 | //TODO: simply return this value rather than check for !data |
4ebe732c | 476 | /* this is the start of a new container */ |
5a081409 | 477 | m->container_offsets[m->n_containers ++] = m->hdr->nlmsg_len; |
33125ac5 TG |
478 | } else { |
479 | /* we don't deal with the case where the user lies about the type | |
480 | * and gives us too little data (so don't do that) | |
481 | */ | |
482 | padding = mempcpy(RTA_DATA(rta), data, data_length); | |
483 | /* make sure also the padding at the end of the message is initialized */ | |
4ebe732c ZJS |
484 | memzero(padding, |
485 | (uint8_t *) m->hdr + message_length - (uint8_t *) padding); | |
33125ac5 | 486 | } |
65f568bb | 487 | |
4ebe732c ZJS |
488 | /* update message size */ |
489 | m->hdr->nlmsg_len = message_length; | |
490 | ||
65f568bb TG |
491 | return 0; |
492 | } | |
493 | ||
d8e538ec TG |
494 | static int message_attribute_has_type(sd_rtnl_message *m, uint16_t attribute_type, uint16_t data_type) { |
495 | const NLType *type; | |
496 | int r; | |
497 | ||
498 | r = type_system_get_type(m->container_type_system[m->n_containers], &type, attribute_type); | |
499 | if (r < 0) | |
500 | return r; | |
501 | ||
502 | if (type->type != data_type) | |
503 | return -EINVAL; | |
504 | ||
505 | return type->size; | |
506 | } | |
507 | ||
0a0dc69b | 508 | int sd_rtnl_message_append_string(sd_rtnl_message *m, unsigned short type, const char *data) { |
d8e538ec | 509 | size_t length, size; |
0a0dc69b | 510 | int r; |
65f568bb TG |
511 | |
512 | assert_return(m, -EINVAL); | |
e5c4350b | 513 | assert_return(!m->sealed, -EPERM); |
65f568bb TG |
514 | assert_return(data, -EINVAL); |
515 | ||
d8e538ec | 516 | r = message_attribute_has_type(m, type, NLA_STRING); |
0a0dc69b TG |
517 | if (r < 0) |
518 | return r; | |
d8e538ec TG |
519 | else |
520 | size = (size_t)r; | |
65f568bb | 521 | |
d8e538ec TG |
522 | if (size) { |
523 | length = strnlen(data, size); | |
524 | if (length >= size) | |
525 | return -EINVAL; | |
526 | } else | |
527 | length = strlen(data); | |
33125ac5 | 528 | |
d8e538ec | 529 | r = add_rtattr(m, type, data, length + 1); |
0a0dc69b TG |
530 | if (r < 0) |
531 | return r; | |
532 | ||
533 | return 0; | |
534 | } | |
535 | ||
7b179640 | 536 | int sd_rtnl_message_append_u8(sd_rtnl_message *m, unsigned short type, uint8_t data) { |
7b179640 SS |
537 | int r; |
538 | ||
539 | assert_return(m, -EINVAL); | |
540 | assert_return(!m->sealed, -EPERM); | |
541 | ||
d8e538ec | 542 | r = message_attribute_has_type(m, type, NLA_U8); |
7b179640 SS |
543 | if (r < 0) |
544 | return r; | |
545 | ||
7b179640 SS |
546 | r = add_rtattr(m, type, &data, sizeof(uint8_t)); |
547 | if (r < 0) | |
548 | return r; | |
549 | ||
550 | return 0; | |
551 | } | |
552 | ||
553 | ||
01b36069 | 554 | int sd_rtnl_message_append_u16(sd_rtnl_message *m, unsigned short type, uint16_t data) { |
01b36069 TG |
555 | int r; |
556 | ||
557 | assert_return(m, -EINVAL); | |
e5c4350b | 558 | assert_return(!m->sealed, -EPERM); |
01b36069 | 559 | |
d8e538ec | 560 | r = message_attribute_has_type(m, type, NLA_U16); |
01b36069 TG |
561 | if (r < 0) |
562 | return r; | |
563 | ||
01b36069 TG |
564 | r = add_rtattr(m, type, &data, sizeof(uint16_t)); |
565 | if (r < 0) | |
566 | return r; | |
567 | ||
568 | return 0; | |
569 | } | |
570 | ||
0a0dc69b | 571 | int sd_rtnl_message_append_u32(sd_rtnl_message *m, unsigned short type, uint32_t data) { |
0a0dc69b TG |
572 | int r; |
573 | ||
574 | assert_return(m, -EINVAL); | |
e5c4350b | 575 | assert_return(!m->sealed, -EPERM); |
0a0dc69b | 576 | |
d8e538ec | 577 | r = message_attribute_has_type(m, type, NLA_U32); |
0a0dc69b TG |
578 | if (r < 0) |
579 | return r; | |
580 | ||
4d47756b | 581 | r = add_rtattr(m, type, &data, sizeof(uint32_t)); |
0a0dc69b TG |
582 | if (r < 0) |
583 | return r; | |
584 | ||
585 | return 0; | |
586 | } | |
587 | ||
588 | int sd_rtnl_message_append_in_addr(sd_rtnl_message *m, unsigned short type, const struct in_addr *data) { | |
0a0dc69b TG |
589 | int r; |
590 | ||
591 | assert_return(m, -EINVAL); | |
e5c4350b | 592 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
593 | assert_return(data, -EINVAL); |
594 | ||
d8e538ec | 595 | r = message_attribute_has_type(m, type, NLA_IN_ADDR); |
0a0dc69b TG |
596 | if (r < 0) |
597 | return r; | |
598 | ||
4d47756b | 599 | r = add_rtattr(m, type, data, sizeof(struct in_addr)); |
0a0dc69b TG |
600 | if (r < 0) |
601 | return r; | |
602 | ||
603 | return 0; | |
604 | } | |
605 | ||
606 | int sd_rtnl_message_append_in6_addr(sd_rtnl_message *m, unsigned short type, const struct in6_addr *data) { | |
0a0dc69b TG |
607 | int r; |
608 | ||
609 | assert_return(m, -EINVAL); | |
e5c4350b | 610 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
611 | assert_return(data, -EINVAL); |
612 | ||
d8e538ec | 613 | r = message_attribute_has_type(m, type, NLA_IN_ADDR); |
0a0dc69b TG |
614 | if (r < 0) |
615 | return r; | |
616 | ||
4d47756b | 617 | r = add_rtattr(m, type, data, sizeof(struct in6_addr)); |
0a0dc69b TG |
618 | if (r < 0) |
619 | return r; | |
620 | ||
621 | return 0; | |
622 | } | |
623 | ||
624 | int sd_rtnl_message_append_ether_addr(sd_rtnl_message *m, unsigned short type, const struct ether_addr *data) { | |
0a0dc69b TG |
625 | int r; |
626 | ||
627 | assert_return(m, -EINVAL); | |
e5c4350b | 628 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
629 | assert_return(data, -EINVAL); |
630 | ||
d8e538ec TG |
631 | r = message_attribute_has_type(m, type, NLA_ETHER_ADDR); |
632 | if (r < 0) | |
633 | return r; | |
0a0dc69b | 634 | |
b9eaf3d1 | 635 | r = add_rtattr(m, type, data, ETH_ALEN); |
0a0dc69b TG |
636 | if (r < 0) |
637 | return r; | |
638 | ||
639 | return 0; | |
65f568bb TG |
640 | } |
641 | ||
aba496a5 UTL |
642 | int sd_rtnl_message_append_cache_info(sd_rtnl_message *m, unsigned short type, const struct ifa_cacheinfo *info) { |
643 | int r; | |
644 | ||
645 | assert_return(m, -EINVAL); | |
646 | assert_return(!m->sealed, -EPERM); | |
647 | assert_return(info, -EINVAL); | |
648 | ||
649 | r = message_attribute_has_type(m, type, NLA_CACHE_INFO); | |
650 | if (r < 0) | |
651 | return r; | |
652 | ||
653 | r = add_rtattr(m, type, info, sizeof(struct ifa_cacheinfo)); | |
654 | if (r < 0) | |
655 | return r; | |
656 | ||
657 | return 0; | |
658 | } | |
659 | ||
ee3a6a51 | 660 | int sd_rtnl_message_open_container(sd_rtnl_message *m, unsigned short type) { |
d8e538ec TG |
661 | size_t size; |
662 | int r; | |
33125ac5 | 663 | |
65f568bb | 664 | assert_return(m, -EINVAL); |
e5c4350b | 665 | assert_return(!m->sealed, -EPERM); |
33125ac5 | 666 | |
d8e538ec TG |
667 | r = message_attribute_has_type(m, type, NLA_NESTED); |
668 | if (r < 0) | |
669 | return r; | |
670 | else | |
671 | size = (size_t)r; | |
33125ac5 | 672 | |
d8e538ec TG |
673 | r = type_system_get_type_system(m->container_type_system[m->n_containers], |
674 | &m->container_type_system[m->n_containers + 1], | |
675 | type); | |
676 | if (r < 0) | |
677 | return r; | |
31a4e153 | 678 | |
d8e538ec TG |
679 | r = add_rtattr(m, type, NULL, size); |
680 | if (r < 0) | |
681 | return r; | |
682 | ||
683 | return 0; | |
684 | } | |
685 | ||
686 | int sd_rtnl_message_open_container_union(sd_rtnl_message *m, unsigned short type, const char *key) { | |
687 | const NLTypeSystemUnion *type_system_union; | |
688 | int r; | |
689 | ||
690 | assert_return(m, -EINVAL); | |
691 | assert_return(!m->sealed, -EPERM); | |
692 | ||
693 | r = type_system_get_type_system_union(m->container_type_system[m->n_containers], &type_system_union, type); | |
694 | if (r < 0) | |
695 | return r; | |
696 | ||
697 | r = type_system_union_get_type_system(type_system_union, | |
698 | &m->container_type_system[m->n_containers + 1], | |
699 | key); | |
700 | if (r < 0) | |
701 | return r; | |
33125ac5 | 702 | |
d8e538ec TG |
703 | r = sd_rtnl_message_append_string(m, type_system_union->match, key); |
704 | if (r < 0) | |
705 | return r; | |
706 | ||
707 | /* do we evere need non-null size */ | |
708 | r = add_rtattr(m, type, NULL, 0); | |
709 | if (r < 0) | |
710 | return r; | |
711 | ||
712 | return 0; | |
33125ac5 TG |
713 | } |
714 | ||
d8e538ec | 715 | |
33125ac5 TG |
716 | int sd_rtnl_message_close_container(sd_rtnl_message *m) { |
717 | assert_return(m, -EINVAL); | |
e5c4350b | 718 | assert_return(!m->sealed, -EPERM); |
5a081409 | 719 | assert_return(m->n_containers > 0, -EINVAL); |
33125ac5 | 720 | |
d8e538ec | 721 | m->container_type_system[m->n_containers] = NULL; |
5a081409 | 722 | m->n_containers --; |
33125ac5 TG |
723 | |
724 | return 0; | |
725 | } | |
726 | ||
44caa5e7 | 727 | int rtnl_message_read_internal(sd_rtnl_message *m, unsigned short type, void **data) { |
f66eeb6b TG |
728 | struct rtattr *rta; |
729 | ||
44caa5e7 SS |
730 | assert_return(m, -EINVAL); |
731 | assert_return(m->sealed, -EPERM); | |
732 | assert_return(data, -EINVAL); | |
d8e538ec TG |
733 | assert(m->n_containers <= RTNL_CONTAINER_DEPTH); |
734 | assert(m->rta_offset_tb[m->n_containers]); | |
735 | assert(type < m->rta_tb_size[m->n_containers]); | |
44caa5e7 | 736 | |
3dd215e0 | 737 | if(!m->rta_offset_tb[m->n_containers][type]) |
44caa5e7 SS |
738 | return -ENODATA; |
739 | ||
3dd215e0 | 740 | rta = (struct rtattr*)((uint8_t *) m->hdr + m->rta_offset_tb[m->n_containers][type]); |
44caa5e7 | 741 | |
f66eeb6b TG |
742 | *data = RTA_DATA(rta); |
743 | ||
744 | return RTA_PAYLOAD(rta); | |
44caa5e7 SS |
745 | } |
746 | ||
747 | int sd_rtnl_message_read_string(sd_rtnl_message *m, unsigned short type, char **data) { | |
748 | int r; | |
749 | void *attr_data; | |
750 | ||
d8e538ec TG |
751 | r = message_attribute_has_type(m, type, NLA_STRING); |
752 | if (r < 0) | |
753 | return r; | |
44caa5e7 SS |
754 | |
755 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 756 | if (r < 0) |
44caa5e7 | 757 | return r; |
f66eeb6b TG |
758 | else if (strnlen(attr_data, r) >= (size_t) r) |
759 | return -EIO; | |
44caa5e7 SS |
760 | |
761 | *data = (char *) attr_data; | |
762 | ||
763 | return 0; | |
764 | } | |
765 | ||
766 | int sd_rtnl_message_read_u8(sd_rtnl_message *m, unsigned short type, uint8_t *data) { | |
767 | int r; | |
768 | void *attr_data; | |
769 | ||
d8e538ec TG |
770 | r = message_attribute_has_type(m, type, NLA_U8); |
771 | if (r < 0) | |
772 | return r; | |
44caa5e7 SS |
773 | |
774 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 775 | if (r < 0) |
44caa5e7 | 776 | return r; |
f66eeb6b TG |
777 | else if ((size_t) r < sizeof(uint8_t)) |
778 | return -EIO; | |
44caa5e7 SS |
779 | |
780 | *data = *(uint8_t *) attr_data; | |
781 | ||
782 | return 0; | |
783 | } | |
784 | ||
785 | int sd_rtnl_message_read_u16(sd_rtnl_message *m, unsigned short type, uint16_t *data) { | |
786 | int r; | |
787 | void *attr_data; | |
788 | ||
d8e538ec TG |
789 | r = message_attribute_has_type(m, type, NLA_U16); |
790 | if (r < 0) | |
791 | return r; | |
44caa5e7 SS |
792 | |
793 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 794 | if (r < 0) |
44caa5e7 | 795 | return r; |
f66eeb6b TG |
796 | else if ((size_t) r < sizeof(uint16_t)) |
797 | return -EIO; | |
44caa5e7 SS |
798 | |
799 | *data = *(uint16_t *) attr_data; | |
800 | ||
801 | return 0; | |
802 | } | |
803 | ||
804 | int sd_rtnl_message_read_u32(sd_rtnl_message *m, unsigned short type, uint32_t *data) { | |
805 | int r; | |
806 | void *attr_data; | |
807 | ||
d8e538ec TG |
808 | r = message_attribute_has_type(m, type, NLA_U32); |
809 | if (r < 0) | |
810 | return r; | |
44caa5e7 SS |
811 | |
812 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 813 | if (r < 0) |
44caa5e7 | 814 | return r; |
f66eeb6b TG |
815 | else if ((size_t)r < sizeof(uint32_t)) |
816 | return -EIO; | |
44caa5e7 SS |
817 | |
818 | *data = *(uint32_t *) attr_data; | |
819 | ||
820 | return 0; | |
821 | } | |
822 | ||
4e9e7f18 SS |
823 | int sd_rtnl_message_read_ether_addr(sd_rtnl_message *m, unsigned short type, struct ether_addr *data) { |
824 | int r; | |
825 | void *attr_data; | |
826 | ||
d8e538ec TG |
827 | r = message_attribute_has_type(m, type, NLA_ETHER_ADDR); |
828 | if (r < 0) | |
829 | return r; | |
4e9e7f18 SS |
830 | |
831 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 832 | if (r < 0) |
4e9e7f18 | 833 | return r; |
f66eeb6b TG |
834 | else if ((size_t)r < sizeof(struct ether_addr)) |
835 | return -EIO; | |
4e9e7f18 SS |
836 | |
837 | memcpy(data, attr_data, sizeof(struct ether_addr)); | |
838 | ||
839 | return 0; | |
840 | } | |
841 | ||
aba496a5 UTL |
842 | int sd_rtnl_message_read_cache_info(sd_rtnl_message *m, unsigned short type, struct ifa_cacheinfo *info) { |
843 | int r; | |
844 | void *attr_data; | |
845 | ||
846 | r = message_attribute_has_type(m, type, NLA_CACHE_INFO); | |
847 | if (r < 0) | |
848 | return r; | |
849 | ||
850 | r = rtnl_message_read_internal(m, type, &attr_data); | |
851 | if (r < 0) | |
852 | return r; | |
853 | else if ((size_t)r < sizeof(struct ifa_cacheinfo)) | |
854 | return -EIO; | |
855 | ||
856 | memcpy(info, attr_data, sizeof(struct ifa_cacheinfo)); | |
857 | ||
858 | return 0; | |
859 | } | |
860 | ||
4e9e7f18 SS |
861 | int sd_rtnl_message_read_in_addr(sd_rtnl_message *m, unsigned short type, struct in_addr *data) { |
862 | int r; | |
863 | void *attr_data; | |
864 | ||
d8e538ec TG |
865 | r = message_attribute_has_type(m, type, NLA_IN_ADDR); |
866 | if (r < 0) | |
867 | return r; | |
4e9e7f18 SS |
868 | |
869 | r = rtnl_message_read_internal(m, type, &attr_data); | |
f66eeb6b | 870 | if (r < 0) |
4e9e7f18 | 871 | return r; |
f66eeb6b TG |
872 | else if ((size_t)r < sizeof(struct in_addr)) |
873 | return -EIO; | |
4e9e7f18 SS |
874 | |
875 | memcpy(data, attr_data, sizeof(struct in_addr)); | |
876 | ||
877 | return 0; | |
878 | } | |
879 | ||
880 | int sd_rtnl_message_read_in6_addr(sd_rtnl_message *m, unsigned short type, struct in6_addr *data) { | |
881 | int r; | |
882 | void *attr_data; | |
883 | ||
d8e538ec TG |
884 | r = message_attribute_has_type(m, type, NLA_IN_ADDR); |
885 | if (r < 0) | |
886 | return r; | |
4e9e7f18 SS |
887 | |
888 | r = rtnl_message_read_internal(m, type, &attr_data); | |
3dd215e0 | 889 | if (r < 0) |
4e9e7f18 | 890 | return r; |
3dd215e0 TG |
891 | else if ((size_t)r < sizeof(struct in6_addr)) |
892 | return -EIO; | |
4e9e7f18 SS |
893 | |
894 | memcpy(data, attr_data, sizeof(struct in6_addr)); | |
895 | ||
896 | return 0; | |
897 | } | |
898 | ||
3dd215e0 | 899 | int sd_rtnl_message_enter_container(sd_rtnl_message *m, unsigned short type) { |
d8e538ec TG |
900 | const NLType *nl_type; |
901 | const NLTypeSystem *type_system; | |
3dd215e0 | 902 | void *container; |
d8e538ec TG |
903 | size_t size; |
904 | int r; | |
3dd215e0 TG |
905 | |
906 | assert_return(m, -EINVAL); | |
907 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -EINVAL); | |
908 | ||
d8e538ec TG |
909 | r = type_system_get_type(m->container_type_system[m->n_containers], |
910 | &nl_type, | |
911 | type); | |
3dd215e0 TG |
912 | if (r < 0) |
913 | return r; | |
3dd215e0 | 914 | |
d8e538ec TG |
915 | if (nl_type->type == NLA_NESTED) { |
916 | r = type_system_get_type_system(m->container_type_system[m->n_containers], | |
917 | &type_system, | |
918 | type); | |
919 | if (r < 0) | |
920 | return r; | |
921 | } else if (nl_type->type == NLA_UNION) { | |
922 | const NLTypeSystemUnion *type_system_union; | |
923 | char *key; | |
924 | ||
925 | r = type_system_get_type_system_union(m->container_type_system[m->n_containers], | |
926 | &type_system_union, | |
927 | type); | |
928 | if (r < 0) | |
929 | return r; | |
930 | ||
931 | r = sd_rtnl_message_read_string(m, type_system_union->match, &key); | |
932 | if (r < 0) | |
933 | return r; | |
934 | ||
935 | r = type_system_union_get_type_system(type_system_union, | |
936 | &type_system, | |
937 | key); | |
938 | if (r < 0) | |
939 | return r; | |
940 | } else | |
941 | return -EINVAL; | |
942 | ||
943 | r = rtnl_message_read_internal(m, type, &container); | |
3dd215e0 TG |
944 | if (r < 0) |
945 | return r; | |
d8e538ec TG |
946 | else |
947 | size = (size_t)r; | |
3dd215e0 | 948 | |
d8e538ec | 949 | m->n_containers ++; |
3dd215e0 TG |
950 | |
951 | r = rtnl_message_parse(m, | |
d8e538ec TG |
952 | &m->rta_offset_tb[m->n_containers], |
953 | &m->rta_tb_size[m->n_containers], | |
954 | type_system->max, | |
3dd215e0 | 955 | container, |
d8e538ec TG |
956 | size); |
957 | if (r < 0) { | |
958 | m->n_containers --; | |
3dd215e0 | 959 | return r; |
d8e538ec | 960 | } |
3dd215e0 | 961 | |
d8e538ec | 962 | m->container_type_system[m->n_containers] = type_system; |
3dd215e0 TG |
963 | |
964 | return 0; | |
965 | } | |
966 | ||
e5c4350b TG |
967 | int sd_rtnl_message_exit_container(sd_rtnl_message *m) { |
968 | assert_return(m, -EINVAL); | |
969 | assert_return(m->sealed, -EINVAL); | |
970 | assert_return(m->n_containers > 0, -EINVAL); | |
971 | ||
3dd215e0 TG |
972 | free(m->rta_offset_tb[m->n_containers]); |
973 | m->rta_offset_tb[m->n_containers] = NULL; | |
d8e538ec | 974 | m->container_type_system[m->n_containers] = NULL; |
3dd215e0 | 975 | |
e5c4350b TG |
976 | m->n_containers --; |
977 | ||
978 | return 0; | |
979 | } | |
980 | ||
3815f36f | 981 | uint32_t rtnl_message_get_serial(sd_rtnl_message *m) { |
65f568bb | 982 | assert(m); |
9d0db178 | 983 | assert(m->hdr); |
65f568bb TG |
984 | |
985 | return m->hdr->nlmsg_seq; | |
986 | } | |
987 | ||
e16bcf98 | 988 | int sd_rtnl_message_get_errno(sd_rtnl_message *m) { |
65f568bb TG |
989 | struct nlmsgerr *err; |
990 | ||
e16bcf98 | 991 | assert_return(m, -EINVAL); |
9d0db178 | 992 | assert_return(m->hdr, -EINVAL); |
65f568bb TG |
993 | |
994 | if (m->hdr->nlmsg_type != NLMSG_ERROR) | |
995 | return 0; | |
996 | ||
997 | err = NLMSG_DATA(m->hdr); | |
998 | ||
999 | return err->error; | |
1000 | } | |
1001 | ||
44caa5e7 SS |
1002 | int rtnl_message_parse(sd_rtnl_message *m, |
1003 | size_t **rta_offset_tb, | |
1004 | unsigned short *rta_tb_size, | |
1005 | int max, | |
1006 | struct rtattr *rta, | |
1007 | unsigned int rt_len) { | |
e634cd40 | 1008 | unsigned short type; |
44caa5e7 SS |
1009 | size_t *tb; |
1010 | ||
c8a7165f | 1011 | tb = new0(size_t, max + 1); |
44caa5e7 SS |
1012 | if(!tb) |
1013 | return -ENOMEM; | |
1014 | ||
c8a7165f | 1015 | *rta_tb_size = max + 1; |
44caa5e7 SS |
1016 | |
1017 | for (; RTA_OK(rta, rt_len); rta = RTA_NEXT(rta, rt_len)) { | |
1018 | type = rta->rta_type; | |
1019 | ||
aef0768e TG |
1020 | /* if the kernel is newer than the headers we used |
1021 | when building, we ignore out-of-range attributes | |
1022 | */ | |
1023 | if (type > max) | |
e634cd40 | 1024 | continue; |
e634cd40 TG |
1025 | |
1026 | if (tb[type]) | |
1027 | log_debug("rtnl: message parse - overwriting repeated attribute"); | |
1028 | ||
1029 | tb[type] = (uint8_t *) rta - (uint8_t *) m->hdr; | |
44caa5e7 SS |
1030 | } |
1031 | ||
1032 | *rta_offset_tb = tb; | |
1033 | ||
1034 | return 0; | |
1035 | } | |
1036 | ||
65f568bb TG |
1037 | /* returns the number of bytes sent, or a negative error code */ |
1038 | int socket_write_message(sd_rtnl *nl, sd_rtnl_message *m) { | |
d4bbdb77 TG |
1039 | union { |
1040 | struct sockaddr sa; | |
1041 | struct sockaddr_nl nl; | |
1042 | } addr = { | |
1043 | .nl.nl_family = AF_NETLINK, | |
1044 | }; | |
65f568bb TG |
1045 | ssize_t k; |
1046 | ||
9d0db178 TG |
1047 | assert(nl); |
1048 | assert(m); | |
1049 | assert(m->hdr); | |
65f568bb TG |
1050 | |
1051 | k = sendto(nl->fd, m->hdr, m->hdr->nlmsg_len, | |
d4bbdb77 | 1052 | 0, &addr.sa, sizeof(addr)); |
65f568bb TG |
1053 | if (k < 0) |
1054 | return (errno == EAGAIN) ? 0 : -errno; | |
1055 | ||
1056 | return k; | |
1057 | } | |
1058 | ||
1059 | /* On success, the number of bytes received is returned and *ret points to the received message | |
1060 | * which has a valid header and the correct size. | |
1061 | * If nothing useful was received 0 is returned. | |
1062 | * On failure, a negative error code is returned. | |
dabfa9d1 | 1063 | */ |
1b89cf56 | 1064 | int socket_read_message(sd_rtnl *rtnl) { |
1403f45a | 1065 | _cleanup_rtnl_message_unref_ sd_rtnl_message *first = NULL; |
bc078e71 TG |
1066 | uint8_t cred_buffer[CMSG_SPACE(sizeof(struct ucred))]; |
1067 | struct iovec iov = {}; | |
1068 | struct msghdr msg = { | |
1069 | .msg_iov = &iov, | |
1070 | .msg_iovlen = 1, | |
1071 | .msg_control = cred_buffer, | |
1072 | .msg_controllen = sizeof(cred_buffer), | |
1073 | }; | |
1074 | struct cmsghdr *cmsg; | |
4e996881 | 1075 | bool auth = false, multi_part = false, done = false; |
1b89cf56 | 1076 | struct nlmsghdr *new_msg; |
a88f77c4 | 1077 | size_t len; |
4e996881 TG |
1078 | int r; |
1079 | unsigned i; | |
65f568bb | 1080 | |
1b89cf56 | 1081 | assert(rtnl); |
a88f77c4 | 1082 | assert(rtnl->rbuffer); |
6fc51883 | 1083 | assert(rtnl->rbuffer_allocated >= sizeof(struct nlmsghdr)); |
65f568bb | 1084 | |
6fc51883 TG |
1085 | /* read nothing, just get the pending message size */ |
1086 | r = recvmsg(rtnl->fd, &msg, MSG_PEEK | MSG_TRUNC); | |
65f568bb | 1087 | if (r < 0) |
a88f77c4 TG |
1088 | /* no data */ |
1089 | return (errno == EAGAIN) ? 0 : -errno; | |
1090 | else if (r == 0) | |
1091 | /* connection was closed by the kernel */ | |
1092 | return -ECONNRESET; | |
6fc51883 TG |
1093 | else |
1094 | len = (size_t)r; | |
65f568bb | 1095 | |
a88f77c4 TG |
1096 | /* make room for the pending message */ |
1097 | if (!greedy_realloc((void **)&rtnl->rbuffer, | |
1098 | &rtnl->rbuffer_allocated, | |
6fc51883 | 1099 | len, sizeof(uint8_t))) |
1b89cf56 | 1100 | return -ENOMEM; |
d4bbdb77 | 1101 | |
a88f77c4 TG |
1102 | iov.iov_base = rtnl->rbuffer; |
1103 | iov.iov_len = rtnl->rbuffer_allocated; | |
bc078e71 | 1104 | |
a88f77c4 | 1105 | r = recvmsg(rtnl->fd, &msg, MSG_TRUNC); |
3dd215e0 | 1106 | if (r < 0) |
bc078e71 TG |
1107 | /* no data */ |
1108 | return (errno == EAGAIN) ? 0 : -errno; | |
3dd215e0 | 1109 | else if (r == 0) |
bc078e71 TG |
1110 | /* connection was closed by the kernel */ |
1111 | return -ECONNRESET; | |
3dd215e0 | 1112 | else |
1b89cf56 | 1113 | len = (size_t)r; |
3dd215e0 | 1114 | |
a88f77c4 TG |
1115 | if (len > rtnl->rbuffer_allocated) |
1116 | /* message did not fit in read buffer */ | |
1117 | return -EIO; | |
1118 | ||
bc078e71 TG |
1119 | for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) { |
1120 | if (cmsg->cmsg_level == SOL_SOCKET && | |
1121 | cmsg->cmsg_type == SCM_CREDENTIALS && | |
1122 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) { | |
1123 | struct ucred *ucred = (void *)CMSG_DATA(cmsg); | |
1124 | ||
1125 | /* from the kernel */ | |
1126 | if (ucred->uid == 0 && ucred->pid == 0) { | |
1127 | auth = true; | |
1128 | break; | |
1129 | } | |
1130 | } | |
1131 | } | |
1132 | ||
1133 | if (!auth) | |
1134 | /* not from the kernel, ignore */ | |
1135 | return 0; | |
1136 | ||
4e996881 TG |
1137 | if (NLMSG_OK(rtnl->rbuffer, len) && rtnl->rbuffer->nlmsg_flags & NLM_F_MULTI) { |
1138 | multi_part = true; | |
1139 | ||
1140 | for (i = 0; i < rtnl->rqueue_partial_size; i++) { | |
1141 | if (rtnl_message_get_serial(rtnl->rqueue_partial[i]) == | |
1142 | rtnl->rbuffer->nlmsg_seq) { | |
1143 | first = rtnl->rqueue_partial[i]; | |
1144 | break; | |
1145 | } | |
1146 | } | |
1147 | } | |
1148 | ||
a88f77c4 | 1149 | for (new_msg = rtnl->rbuffer; NLMSG_OK(new_msg, len); new_msg = NLMSG_NEXT(new_msg, len)) { |
1b89cf56 TG |
1150 | _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL; |
1151 | const NLType *nl_type; | |
3dd215e0 | 1152 | |
1b89cf56 TG |
1153 | if (new_msg->nlmsg_pid && new_msg->nlmsg_pid != rtnl->sockaddr.nl.nl_pid) |
1154 | /* not broadcast and not for us */ | |
1155 | continue; | |
3dd215e0 | 1156 | |
1b89cf56 | 1157 | if (new_msg->nlmsg_type == NLMSG_NOOP) |
4e996881 | 1158 | /* silently drop noop messages */ |
1b89cf56 | 1159 | continue; |
bdd13f6b | 1160 | |
4e996881 TG |
1161 | if (new_msg->nlmsg_type == NLMSG_DONE) { |
1162 | /* finished reading multi-part message */ | |
1163 | done = true; | |
1403f45a | 1164 | break; |
4e996881 | 1165 | } |
1403f45a | 1166 | |
1b89cf56 TG |
1167 | /* check that we support this message type */ |
1168 | r = type_system_get_type(NULL, &nl_type, new_msg->nlmsg_type); | |
1169 | if (r < 0) { | |
1170 | if (r == -ENOTSUP) | |
1171 | log_debug("sd-rtnl: ignored message with unknown type: %u", | |
1172 | new_msg->nlmsg_type); | |
d8e538ec | 1173 | |
1b89cf56 TG |
1174 | continue; |
1175 | } | |
bdd13f6b | 1176 | |
1b89cf56 TG |
1177 | /* check that the size matches the message type */ |
1178 | if (new_msg->nlmsg_len < NLMSG_LENGTH(nl_type->size)) | |
1179 | continue; | |
65f568bb | 1180 | |
1b89cf56 TG |
1181 | r = message_new_empty(rtnl, &m); |
1182 | if (r < 0) | |
1183 | return r; | |
1184 | ||
1185 | m->hdr = memdup(new_msg, new_msg->nlmsg_len); | |
1186 | if (!m->hdr) | |
1187 | return -ENOMEM; | |
1188 | ||
1189 | /* seal and parse the top-level message */ | |
1190 | r = sd_rtnl_message_rewind(m); | |
1191 | if (r < 0) | |
1192 | return r; | |
1193 | ||
4e996881 TG |
1194 | /* push the message onto the multi-part message stack */ |
1195 | if (first) | |
1196 | m->next = first; | |
1197 | first = m; | |
1b89cf56 | 1198 | m = NULL; |
4e996881 | 1199 | } |
1403f45a | 1200 | |
4e996881 TG |
1201 | if (len) |
1202 | log_debug("sd-rtnl: discarding %zu bytes of incoming message", len); | |
1b89cf56 | 1203 | |
4e996881 TG |
1204 | if (!first) |
1205 | return 0; | |
65f568bb | 1206 | |
4e996881 TG |
1207 | if (!multi_part || done) { |
1208 | /* we got a complete message, push it on the read queue */ | |
24a02673 TG |
1209 | r = rtnl_rqueue_make_room(rtnl); |
1210 | if (r < 0) | |
1211 | return r; | |
1212 | ||
4e996881 TG |
1213 | if (i < rtnl->rqueue_partial_size) { |
1214 | /* remove the message form the partial read queue */ | |
1215 | memmove(rtnl->rqueue_partial + i,rtnl->rqueue_partial + i + 1, | |
1216 | sizeof(sd_rtnl_message*) * (rtnl->rqueue_partial_size - i - 1)); | |
1217 | rtnl->rqueue_partial_size --; | |
1218 | } | |
1219 | ||
24a02673 TG |
1220 | rtnl->rqueue[rtnl->rqueue_size ++] = first; |
1221 | first = NULL; | |
1403f45a | 1222 | |
4e996881 TG |
1223 | return 1; |
1224 | } else { | |
1225 | /* we only got a partial multi-part message, push it on the | |
1226 | partial read queue */ | |
1227 | if (i < rtnl->rqueue_partial_size) { | |
1228 | rtnl->rqueue_partial[i] = first; | |
1229 | } else { | |
1230 | r = rtnl_rqueue_partial_make_room(rtnl); | |
1231 | if (r < 0) | |
1232 | return r; | |
1233 | ||
1234 | rtnl->rqueue_partial[rtnl->rqueue_partial_size ++] = first; | |
1235 | } | |
1236 | first = NULL; | |
1403f45a | 1237 | |
4e996881 TG |
1238 | return 0; |
1239 | } | |
65f568bb | 1240 | } |
0fc7531b TG |
1241 | |
1242 | int sd_rtnl_message_rewind(sd_rtnl_message *m) { | |
d8e538ec | 1243 | const NLType *type; |
3dd215e0 TG |
1244 | unsigned i; |
1245 | int r; | |
0fc7531b TG |
1246 | |
1247 | assert_return(m, -EINVAL); | |
0fc7531b | 1248 | |
3dd215e0 TG |
1249 | /* don't allow appending to message once parsed */ |
1250 | if (!m->sealed) | |
1251 | rtnl_message_seal(m); | |
1252 | ||
1253 | for (i = 1; i <= m->n_containers; i++) { | |
1254 | free(m->rta_offset_tb[i]); | |
1255 | m->rta_offset_tb[i] = NULL; | |
1256 | m->rta_tb_size[i] = 0; | |
d8e538ec | 1257 | m->container_type_system[i] = NULL; |
3dd215e0 TG |
1258 | } |
1259 | ||
1260 | m->n_containers = 0; | |
1261 | ||
1262 | if (m->rta_offset_tb[0]) { | |
1263 | /* top-level attributes have already been parsed */ | |
1264 | return 0; | |
1265 | } | |
1266 | ||
d8e538ec TG |
1267 | assert(m->hdr); |
1268 | ||
1269 | r = type_system_get_type(NULL, &type, m->hdr->nlmsg_type); | |
1270 | if (r < 0) | |
1271 | return r; | |
1272 | ||
1273 | if (type->type == NLA_NESTED) { | |
1274 | const NLTypeSystem *type_system = type->type_system; | |
1275 | ||
1276 | assert(type_system); | |
1277 | ||
1278 | m->container_type_system[0] = type_system; | |
1279 | ||
1280 | r = rtnl_message_parse(m, | |
1281 | &m->rta_offset_tb[m->n_containers], | |
1282 | &m->rta_tb_size[m->n_containers], | |
1283 | type_system->max, | |
0834ff93 TG |
1284 | (struct rtattr*)((uint8_t*)NLMSG_DATA(m->hdr) + |
1285 | NLMSG_ALIGN(type->size)), | |
d8e538ec TG |
1286 | NLMSG_PAYLOAD(m->hdr, type->size)); |
1287 | if (r < 0) | |
1288 | return r; | |
0fc7531b TG |
1289 | } |
1290 | ||
1291 | return 0; | |
1292 | } | |
3dd215e0 TG |
1293 | |
1294 | void rtnl_message_seal(sd_rtnl_message *m) { | |
1295 | assert(m); | |
1296 | assert(!m->sealed); | |
1297 | ||
1298 | m->sealed = true; | |
1299 | } | |
1403f45a TG |
1300 | |
1301 | sd_rtnl_message *sd_rtnl_message_next(sd_rtnl_message *m) { | |
1302 | assert_return(m, NULL); | |
1303 | ||
1304 | return m->next; | |
1305 | } |