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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
65f568bb TG |
2 | |
3 | #include <netinet/in.h> | |
65f568bb TG |
4 | #include <stdbool.h> |
5 | #include <unistd.h> | |
6 | ||
07630cea LP |
7 | #include "sd-netlink.h" |
8 | ||
b5efdb8a | 9 | #include "alloc-util.h" |
f97b34a6 | 10 | #include "format-util.h" |
d5eff740 | 11 | #include "missing.h" |
1c4baffc TG |
12 | #include "netlink-internal.h" |
13 | #include "netlink-types.h" | |
07630cea LP |
14 | #include "netlink-util.h" |
15 | #include "refcnt.h" | |
16 | #include "socket-util.h" | |
17 | #include "util.h" | |
65f568bb | 18 | |
f663aeb8 | 19 | #define GET_CONTAINER(m, i) ((i) < (m)->n_containers ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->containers[i].offset) : NULL) |
313cefa1 | 20 | #define PUSH_CONTAINER(m, new) (m)->container_offsets[(m)->n_containers++] = (uint8_t*)(new) - (uint8_t*)(m)->hdr; |
4ebe732c | 21 | |
0a2478a9 | 22 | #define RTA_TYPE(rta) ((rta)->rta_type & NLA_TYPE_MASK) |
4c641e99 | 23 | #define RTA_FLAGS(rta) ((rta)->rta_type & ~NLA_TYPE_MASK) |
0a2478a9 | 24 | |
89489ef7 | 25 | int message_new_empty(sd_netlink *rtnl, sd_netlink_message **ret) { |
1c4baffc | 26 | sd_netlink_message *m; |
65f568bb TG |
27 | |
28 | assert_return(ret, -EINVAL); | |
65f568bb | 29 | |
f131770b | 30 | /* Note that 'rtnl' is currently unused, if we start using it internally |
8c578303 | 31 | we must take care to avoid problems due to mutual references between |
ff9b60f3 | 32 | buses and their queued messages. See sd-bus. |
8c578303 TG |
33 | */ |
34 | ||
1c4baffc | 35 | m = new0(sd_netlink_message, 1); |
65f568bb TG |
36 | if (!m) |
37 | return -ENOMEM; | |
38 | ||
65f568bb | 39 | m->n_ref = REFCNT_INIT; |
05d0c2e3 | 40 | m->protocol = rtnl->protocol; |
65f568bb TG |
41 | m->sealed = false; |
42 | ||
43 | *ret = m; | |
44 | ||
45 | return 0; | |
46 | } | |
47 | ||
1c4baffc | 48 | int message_new(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t type) { |
4afd3348 | 49 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
d8e538ec | 50 | const NLType *nl_type; |
05d0c2e3 | 51 | const NLTypeSystem *type_system_root; |
d8e538ec TG |
52 | size_t size; |
53 | int r; | |
54 | ||
05d0c2e3 JT |
55 | assert_return(rtnl, -EINVAL); |
56 | ||
57 | type_system_root = type_system_get_root(rtnl->protocol); | |
58 | ||
59 | r = type_system_get_type(type_system_root, &nl_type, type); | |
d8e538ec TG |
60 | if (r < 0) |
61 | return r; | |
62 | ||
12b7dff4 DH |
63 | if (type_get_type(nl_type) != NETLINK_TYPE_NESTED) |
64 | return -EINVAL; | |
65 | ||
1b89cf56 | 66 | r = message_new_empty(rtnl, &m); |
d8e538ec TG |
67 | if (r < 0) |
68 | return r; | |
69 | ||
817d1cd8 | 70 | size = NLMSG_SPACE(type_get_size(nl_type)); |
1b89cf56 TG |
71 | |
72 | assert(size >= sizeof(struct nlmsghdr)); | |
73 | m->hdr = malloc0(size); | |
74 | if (!m->hdr) | |
75 | return -ENOMEM; | |
76 | ||
77 | m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; | |
78 | ||
f663aeb8 | 79 | type_get_type_system(nl_type, &m->containers[0].type_system); |
1b89cf56 TG |
80 | m->hdr->nlmsg_len = size; |
81 | m->hdr->nlmsg_type = type; | |
82 | ||
1cc6c93a | 83 | *ret = TAKE_PTR(m); |
d8e538ec TG |
84 | |
85 | return 0; | |
86 | } | |
87 | ||
1c4baffc | 88 | int sd_netlink_message_request_dump(sd_netlink_message *m, int dump) { |
6e20c8f8 TG |
89 | assert_return(m, -EINVAL); |
90 | assert_return(m->hdr, -EINVAL); | |
bce67bbe SS |
91 | |
92 | assert_return(IN_SET(m->hdr->nlmsg_type, RTM_GETLINK, RTM_GETADDR, RTM_GETROUTE, RTM_GETNEIGH, RTM_GETRULE, RTM_GETADDRLABEL), -EINVAL); | |
6e20c8f8 | 93 | |
5883ff60 | 94 | SET_FLAG(m->hdr->nlmsg_flags, NLM_F_DUMP, dump); |
6e20c8f8 TG |
95 | |
96 | return 0; | |
97 | } | |
98 | ||
1c71f7f3 | 99 | DEFINE_ATOMIC_REF_FUNC(sd_netlink_message, sd_netlink_message); |
65f568bb | 100 | |
1c4baffc | 101 | sd_netlink_message *sd_netlink_message_unref(sd_netlink_message *m) { |
82e4eda6 DH |
102 | sd_netlink_message *t; |
103 | ||
104 | while (m && REFCNT_DEC(m->n_ref) == 0) { | |
3dd215e0 TG |
105 | unsigned i; |
106 | ||
65f568bb | 107 | free(m->hdr); |
3dd215e0 | 108 | |
9f5bbfe3 | 109 | for (i = 0; i <= m->n_containers; i++) |
f663aeb8 | 110 | free(m->containers[i].attributes); |
3dd215e0 | 111 | |
82e4eda6 DH |
112 | t = m; |
113 | m = m->next; | |
114 | free(t); | |
65f568bb TG |
115 | } |
116 | ||
117 | return NULL; | |
118 | } | |
119 | ||
1c4baffc | 120 | int sd_netlink_message_get_type(sd_netlink_message *m, uint16_t *type) { |
65f568bb TG |
121 | assert_return(m, -EINVAL); |
122 | assert_return(type, -EINVAL); | |
123 | ||
124 | *type = m->hdr->nlmsg_type; | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
c06cb593 SS |
129 | int sd_netlink_message_set_flags(sd_netlink_message *m, uint16_t flags) { |
130 | assert_return(m, -EINVAL); | |
131 | assert_return(flags, -EINVAL); | |
132 | ||
133 | m->hdr->nlmsg_flags = flags; | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
1c4baffc | 138 | int sd_netlink_message_is_broadcast(sd_netlink_message *m) { |
1f0db3ed TG |
139 | assert_return(m, -EINVAL); |
140 | ||
3f42446d | 141 | return m->broadcast; |
1f0db3ed TG |
142 | } |
143 | ||
4ebe732c ZJS |
144 | /* If successful the updated message will be correctly aligned, if |
145 | unsuccessful the old message is untouched. */ | |
1c4baffc | 146 | static int add_rtattr(sd_netlink_message *m, unsigned short type, const void *data, size_t data_length) { |
7ca1d319 TG |
147 | uint32_t rta_length; |
148 | size_t message_length, padding_length; | |
65f568bb TG |
149 | struct nlmsghdr *new_hdr; |
150 | struct rtattr *rta; | |
8e337e64 | 151 | char *padding; |
5a081409 | 152 | unsigned i; |
7ca1d319 | 153 | int offset; |
65f568bb | 154 | |
33125ac5 TG |
155 | assert(m); |
156 | assert(m->hdr); | |
e5c4350b | 157 | assert(!m->sealed); |
33125ac5 | 158 | assert(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len); |
7ca1d319 TG |
159 | assert(!data || data_length); |
160 | ||
161 | /* get offset of the new attribute */ | |
162 | offset = m->hdr->nlmsg_len; | |
65f568bb | 163 | |
8e337e64 | 164 | /* get the size of the new rta attribute (with padding at the end) */ |
65f568bb | 165 | rta_length = RTA_LENGTH(data_length); |
4ebe732c ZJS |
166 | |
167 | /* get the new message size (with padding at the end) */ | |
7ca1d319 | 168 | message_length = offset + RTA_ALIGN(rta_length); |
65f568bb | 169 | |
05d0c2e3 JT |
170 | /* buffer should be smaller than both one page or 8K to be accepted by the kernel */ |
171 | if (message_length > MIN(page_size(), 8192UL)) | |
172 | return -ENOBUFS; | |
173 | ||
65f568bb TG |
174 | /* realloc to fit the new attribute */ |
175 | new_hdr = realloc(m->hdr, message_length); | |
176 | if (!new_hdr) | |
177 | return -ENOMEM; | |
178 | m->hdr = new_hdr; | |
179 | ||
180 | /* get pointer to the attribute we are about to add */ | |
7ca1d319 | 181 | rta = (struct rtattr *) ((uint8_t *) m->hdr + offset); |
65f568bb | 182 | |
5a081409 TG |
183 | /* if we are inside containers, extend them */ |
184 | for (i = 0; i < m->n_containers; i++) | |
7ca1d319 | 185 | GET_CONTAINER(m, i)->rta_len += message_length - offset; |
33125ac5 | 186 | |
65f568bb TG |
187 | /* fill in the attribute */ |
188 | rta->rta_type = type; | |
189 | rta->rta_len = rta_length; | |
7ca1d319 | 190 | if (data) |
33125ac5 TG |
191 | /* we don't deal with the case where the user lies about the type |
192 | * and gives us too little data (so don't do that) | |
7ca1d319 | 193 | */ |
33125ac5 | 194 | padding = mempcpy(RTA_DATA(rta), data, data_length); |
b8cc01a2 SS |
195 | |
196 | else | |
7ca1d319 TG |
197 | /* if no data was passed, make sure we still initialize the padding |
198 | note that we can have data_length > 0 (used by some containers) */ | |
199 | padding = RTA_DATA(rta); | |
65f568bb | 200 | |
7ca1d319 TG |
201 | /* make sure also the padding at the end of the message is initialized */ |
202 | padding_length = (uint8_t*)m->hdr + message_length - (uint8_t*)padding; | |
203 | memzero(padding, padding_length); | |
204 | ||
4ebe732c ZJS |
205 | /* update message size */ |
206 | m->hdr->nlmsg_len = message_length; | |
207 | ||
7ca1d319 | 208 | return offset; |
65f568bb TG |
209 | } |
210 | ||
6c14ad61 | 211 | static int message_attribute_has_type(sd_netlink_message *m, size_t *out_size, uint16_t attribute_type, uint16_t data_type) { |
d8e538ec TG |
212 | const NLType *type; |
213 | int r; | |
214 | ||
6c14ad61 DH |
215 | assert(m); |
216 | ||
f663aeb8 | 217 | r = type_system_get_type(m->containers[m->n_containers].type_system, &type, attribute_type); |
d8e538ec TG |
218 | if (r < 0) |
219 | return r; | |
220 | ||
817d1cd8 | 221 | if (type_get_type(type) != data_type) |
d8e538ec TG |
222 | return -EINVAL; |
223 | ||
6c14ad61 DH |
224 | if (out_size) |
225 | *out_size = type_get_size(type); | |
226 | return 0; | |
d8e538ec TG |
227 | } |
228 | ||
1c4baffc | 229 | int sd_netlink_message_append_string(sd_netlink_message *m, unsigned short type, const char *data) { |
d8e538ec | 230 | size_t length, size; |
0a0dc69b | 231 | int r; |
65f568bb TG |
232 | |
233 | assert_return(m, -EINVAL); | |
e5c4350b | 234 | assert_return(!m->sealed, -EPERM); |
65f568bb TG |
235 | assert_return(data, -EINVAL); |
236 | ||
6c14ad61 | 237 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_STRING); |
0a0dc69b TG |
238 | if (r < 0) |
239 | return r; | |
65f568bb | 240 | |
d8e538ec | 241 | if (size) { |
3072eecf LP |
242 | length = strnlen(data, size+1); |
243 | if (length > size) | |
d8e538ec TG |
244 | return -EINVAL; |
245 | } else | |
246 | length = strlen(data); | |
33125ac5 | 247 | |
d8e538ec | 248 | r = add_rtattr(m, type, data, length + 1); |
0a0dc69b TG |
249 | if (r < 0) |
250 | return r; | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
c06aead0 SS |
255 | int sd_netlink_message_append_flag(sd_netlink_message *m, unsigned short type) { |
256 | size_t size; | |
257 | int r; | |
258 | ||
259 | assert_return(m, -EINVAL); | |
260 | assert_return(!m->sealed, -EPERM); | |
261 | ||
262 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_FLAG); | |
263 | if (r < 0) | |
264 | return r; | |
265 | ||
266 | r = add_rtattr(m, type, NULL, 0); | |
267 | if (r < 0) | |
268 | return r; | |
269 | ||
270 | return 0; | |
271 | } | |
272 | ||
1c4baffc | 273 | int sd_netlink_message_append_u8(sd_netlink_message *m, unsigned short type, uint8_t data) { |
7b179640 SS |
274 | int r; |
275 | ||
276 | assert_return(m, -EINVAL); | |
277 | assert_return(!m->sealed, -EPERM); | |
278 | ||
6c14ad61 | 279 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U8); |
7b179640 SS |
280 | if (r < 0) |
281 | return r; | |
282 | ||
7b179640 SS |
283 | r = add_rtattr(m, type, &data, sizeof(uint8_t)); |
284 | if (r < 0) | |
285 | return r; | |
286 | ||
287 | return 0; | |
288 | } | |
289 | ||
1c4baffc | 290 | int sd_netlink_message_append_u16(sd_netlink_message *m, unsigned short type, uint16_t data) { |
01b36069 TG |
291 | int r; |
292 | ||
293 | assert_return(m, -EINVAL); | |
e5c4350b | 294 | assert_return(!m->sealed, -EPERM); |
01b36069 | 295 | |
6c14ad61 | 296 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U16); |
01b36069 TG |
297 | if (r < 0) |
298 | return r; | |
299 | ||
01b36069 TG |
300 | r = add_rtattr(m, type, &data, sizeof(uint16_t)); |
301 | if (r < 0) | |
302 | return r; | |
303 | ||
304 | return 0; | |
305 | } | |
306 | ||
1c4baffc | 307 | int sd_netlink_message_append_u32(sd_netlink_message *m, unsigned short type, uint32_t data) { |
0a0dc69b TG |
308 | int r; |
309 | ||
310 | assert_return(m, -EINVAL); | |
e5c4350b | 311 | assert_return(!m->sealed, -EPERM); |
0a0dc69b | 312 | |
6c14ad61 | 313 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U32); |
0a0dc69b TG |
314 | if (r < 0) |
315 | return r; | |
316 | ||
4d47756b | 317 | r = add_rtattr(m, type, &data, sizeof(uint32_t)); |
0a0dc69b TG |
318 | if (r < 0) |
319 | return r; | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
17af840b SS |
324 | int sd_netlink_message_append_data(sd_netlink_message *m, unsigned short type, const void *data, size_t len) { |
325 | int r; | |
326 | ||
327 | assert_return(m, -EINVAL); | |
328 | assert_return(!m->sealed, -EPERM); | |
329 | ||
b8cc01a2 | 330 | r = add_rtattr(m, type, data, len); |
17af840b SS |
331 | if (r < 0) |
332 | return r; | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
1c4baffc | 337 | int sd_netlink_message_append_in_addr(sd_netlink_message *m, unsigned short type, const struct in_addr *data) { |
0a0dc69b TG |
338 | int r; |
339 | ||
340 | assert_return(m, -EINVAL); | |
e5c4350b | 341 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
342 | assert_return(data, -EINVAL); |
343 | ||
6c14ad61 | 344 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
0a0dc69b TG |
345 | if (r < 0) |
346 | return r; | |
347 | ||
4d47756b | 348 | r = add_rtattr(m, type, data, sizeof(struct in_addr)); |
0a0dc69b TG |
349 | if (r < 0) |
350 | return r; | |
351 | ||
352 | return 0; | |
353 | } | |
354 | ||
1c4baffc | 355 | int sd_netlink_message_append_in6_addr(sd_netlink_message *m, unsigned short type, const struct in6_addr *data) { |
0a0dc69b TG |
356 | int r; |
357 | ||
358 | assert_return(m, -EINVAL); | |
e5c4350b | 359 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
360 | assert_return(data, -EINVAL); |
361 | ||
6c14ad61 | 362 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
0a0dc69b TG |
363 | if (r < 0) |
364 | return r; | |
365 | ||
4d47756b | 366 | r = add_rtattr(m, type, data, sizeof(struct in6_addr)); |
0a0dc69b TG |
367 | if (r < 0) |
368 | return r; | |
369 | ||
370 | return 0; | |
371 | } | |
372 | ||
1c4baffc | 373 | int sd_netlink_message_append_ether_addr(sd_netlink_message *m, unsigned short type, const struct ether_addr *data) { |
0a0dc69b TG |
374 | int r; |
375 | ||
376 | assert_return(m, -EINVAL); | |
e5c4350b | 377 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
378 | assert_return(data, -EINVAL); |
379 | ||
6c14ad61 | 380 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_ETHER_ADDR); |
d8e538ec TG |
381 | if (r < 0) |
382 | return r; | |
0a0dc69b | 383 | |
b9eaf3d1 | 384 | r = add_rtattr(m, type, data, ETH_ALEN); |
0a0dc69b TG |
385 | if (r < 0) |
386 | return r; | |
387 | ||
388 | return 0; | |
65f568bb TG |
389 | } |
390 | ||
1c4baffc | 391 | int sd_netlink_message_append_cache_info(sd_netlink_message *m, unsigned short type, const struct ifa_cacheinfo *info) { |
aba496a5 UTL |
392 | int r; |
393 | ||
394 | assert_return(m, -EINVAL); | |
395 | assert_return(!m->sealed, -EPERM); | |
396 | assert_return(info, -EINVAL); | |
397 | ||
6c14ad61 | 398 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_CACHE_INFO); |
aba496a5 UTL |
399 | if (r < 0) |
400 | return r; | |
401 | ||
402 | r = add_rtattr(m, type, info, sizeof(struct ifa_cacheinfo)); | |
403 | if (r < 0) | |
404 | return r; | |
405 | ||
406 | return 0; | |
407 | } | |
408 | ||
1c4baffc | 409 | int sd_netlink_message_open_container(sd_netlink_message *m, unsigned short type) { |
d8e538ec TG |
410 | size_t size; |
411 | int r; | |
33125ac5 | 412 | |
65f568bb | 413 | assert_return(m, -EINVAL); |
e5c4350b | 414 | assert_return(!m->sealed, -EPERM); |
7ca1d319 | 415 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -ERANGE); |
33125ac5 | 416 | |
6c14ad61 | 417 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_NESTED); |
4af7b60d TG |
418 | if (r < 0) { |
419 | const NLTypeSystemUnion *type_system_union; | |
420 | int family; | |
421 | ||
6c14ad61 | 422 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_UNION); |
4af7b60d TG |
423 | if (r < 0) |
424 | return r; | |
4af7b60d | 425 | |
89489ef7 | 426 | r = sd_rtnl_message_get_family(m, &family); |
4af7b60d TG |
427 | if (r < 0) |
428 | return r; | |
429 | ||
f663aeb8 | 430 | r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, &type_system_union, type); |
4af7b60d TG |
431 | if (r < 0) |
432 | return r; | |
433 | ||
434 | r = type_system_union_protocol_get_type_system(type_system_union, | |
f663aeb8 | 435 | &m->containers[m->n_containers + 1].type_system, |
4af7b60d TG |
436 | family); |
437 | if (r < 0) | |
438 | return r; | |
439 | } else { | |
f663aeb8 TG |
440 | r = type_system_get_type_system(m->containers[m->n_containers].type_system, |
441 | &m->containers[m->n_containers + 1].type_system, | |
4af7b60d TG |
442 | type); |
443 | if (r < 0) | |
444 | return r; | |
445 | } | |
31a4e153 | 446 | |
fcf81a54 | 447 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, size); |
d8e538ec TG |
448 | if (r < 0) |
449 | return r; | |
450 | ||
313cefa1 | 451 | m->containers[m->n_containers++].offset = r; |
7ca1d319 | 452 | |
d8e538ec TG |
453 | return 0; |
454 | } | |
455 | ||
1c4baffc | 456 | int sd_netlink_message_open_container_union(sd_netlink_message *m, unsigned short type, const char *key) { |
d8e538ec TG |
457 | const NLTypeSystemUnion *type_system_union; |
458 | int r; | |
459 | ||
460 | assert_return(m, -EINVAL); | |
461 | assert_return(!m->sealed, -EPERM); | |
462 | ||
f663aeb8 | 463 | r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, &type_system_union, type); |
d8e538ec TG |
464 | if (r < 0) |
465 | return r; | |
466 | ||
467 | r = type_system_union_get_type_system(type_system_union, | |
f663aeb8 | 468 | &m->containers[m->n_containers + 1].type_system, |
d8e538ec TG |
469 | key); |
470 | if (r < 0) | |
471 | return r; | |
33125ac5 | 472 | |
1c4baffc | 473 | r = sd_netlink_message_append_string(m, type_system_union->match, key); |
d8e538ec TG |
474 | if (r < 0) |
475 | return r; | |
476 | ||
05d0c2e3 | 477 | /* do we ever need non-null size */ |
da041d69 | 478 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, 0); |
d8e538ec TG |
479 | if (r < 0) |
480 | return r; | |
481 | ||
313cefa1 | 482 | m->containers[m->n_containers++].offset = r; |
7ca1d319 | 483 | |
d8e538ec | 484 | return 0; |
33125ac5 TG |
485 | } |
486 | ||
1c4baffc | 487 | int sd_netlink_message_close_container(sd_netlink_message *m) { |
33125ac5 | 488 | assert_return(m, -EINVAL); |
e5c4350b | 489 | assert_return(!m->sealed, -EPERM); |
5a081409 | 490 | assert_return(m->n_containers > 0, -EINVAL); |
33125ac5 | 491 | |
f663aeb8 | 492 | m->containers[m->n_containers].type_system = NULL; |
05d0c2e3 JT |
493 | m->containers[m->n_containers].offset = 0; |
494 | m->n_containers--; | |
495 | ||
496 | return 0; | |
497 | } | |
498 | ||
499 | int sd_netlink_message_open_array(sd_netlink_message *m, uint16_t type) { | |
500 | int r; | |
501 | ||
502 | assert_return(m, -EINVAL); | |
503 | assert_return(!m->sealed, -EPERM); | |
504 | assert_return(m->n_containers > 0, -EINVAL); | |
505 | ||
506 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, 0); | |
507 | if (r < 0) | |
508 | return r; | |
509 | ||
510 | m->containers[m->n_containers].offset = r; | |
511 | m->n_containers++; | |
512 | m->containers[m->n_containers].type_system = m->containers[m->n_containers - 1].type_system; | |
513 | ||
514 | return 0; | |
515 | } | |
516 | ||
517 | int sd_netlink_message_cancel_array(sd_netlink_message *m) { | |
518 | unsigned i; | |
519 | uint32_t rta_len; | |
520 | ||
521 | assert_return(m, -EINVAL); | |
522 | assert_return(!m->sealed, -EPERM); | |
523 | assert_return(m->n_containers > 1, -EINVAL); | |
524 | ||
525 | rta_len = GET_CONTAINER(m, (m->n_containers - 1))->rta_len; | |
526 | ||
527 | for (i = 0; i < m->n_containers; i++) | |
528 | GET_CONTAINER(m, i)->rta_len -= rta_len; | |
529 | ||
530 | m->hdr->nlmsg_len -= rta_len; | |
531 | ||
313cefa1 | 532 | m->n_containers--; |
05d0c2e3 | 533 | m->containers[m->n_containers].type_system = NULL; |
33125ac5 TG |
534 | |
535 | return 0; | |
536 | } | |
537 | ||
4c641e99 | 538 | static int netlink_message_read_internal(sd_netlink_message *m, unsigned short type, void **data, bool *net_byteorder) { |
f663aeb8 | 539 | struct netlink_attribute *attribute; |
f66eeb6b TG |
540 | struct rtattr *rta; |
541 | ||
44caa5e7 SS |
542 | assert_return(m, -EINVAL); |
543 | assert_return(m->sealed, -EPERM); | |
544 | assert_return(data, -EINVAL); | |
f1dd72c2 | 545 | |
0610939d | 546 | assert(m->n_containers < RTNL_CONTAINER_DEPTH); |
f663aeb8 TG |
547 | assert(m->containers[m->n_containers].attributes); |
548 | assert(type < m->containers[m->n_containers].n_attributes); | |
44caa5e7 | 549 | |
f663aeb8 TG |
550 | attribute = &m->containers[m->n_containers].attributes[type]; |
551 | ||
f1dd72c2 | 552 | if (attribute->offset == 0) |
44caa5e7 SS |
553 | return -ENODATA; |
554 | ||
f663aeb8 | 555 | rta = (struct rtattr*)((uint8_t *) m->hdr + attribute->offset); |
44caa5e7 | 556 | |
f66eeb6b TG |
557 | *data = RTA_DATA(rta); |
558 | ||
4c641e99 TG |
559 | if (net_byteorder) |
560 | *net_byteorder = attribute->net_byteorder; | |
561 | ||
f66eeb6b | 562 | return RTA_PAYLOAD(rta); |
44caa5e7 SS |
563 | } |
564 | ||
926062f0 SS |
565 | int sd_netlink_message_read(sd_netlink_message *m, unsigned short type, size_t size, void *data) { |
566 | void *attr_data; | |
567 | int r; | |
568 | ||
569 | assert_return(m, -EINVAL); | |
570 | ||
571 | r = netlink_message_read_internal(m, type, &attr_data, NULL); | |
572 | if (r < 0) | |
573 | return r; | |
574 | ||
575 | if ((size_t) r < size) | |
576 | return -EIO; | |
577 | ||
578 | if (data) | |
579 | memcpy(data, attr_data, size); | |
580 | ||
581 | return 0; | |
582 | } | |
583 | ||
1c4baffc | 584 | int sd_netlink_message_read_string(sd_netlink_message *m, unsigned short type, const char **data) { |
44caa5e7 SS |
585 | int r; |
586 | void *attr_data; | |
587 | ||
73ae2b7d TG |
588 | assert_return(m, -EINVAL); |
589 | ||
6c14ad61 | 590 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_STRING); |
d8e538ec TG |
591 | if (r < 0) |
592 | return r; | |
44caa5e7 | 593 | |
4c641e99 | 594 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
f66eeb6b | 595 | if (r < 0) |
44caa5e7 | 596 | return r; |
f66eeb6b TG |
597 | else if (strnlen(attr_data, r) >= (size_t) r) |
598 | return -EIO; | |
44caa5e7 | 599 | |
73ae2b7d TG |
600 | if (data) |
601 | *data = (const char *) attr_data; | |
44caa5e7 SS |
602 | |
603 | return 0; | |
604 | } | |
605 | ||
1c4baffc | 606 | int sd_netlink_message_read_u8(sd_netlink_message *m, unsigned short type, uint8_t *data) { |
44caa5e7 SS |
607 | int r; |
608 | void *attr_data; | |
609 | ||
73ae2b7d TG |
610 | assert_return(m, -EINVAL); |
611 | ||
6c14ad61 | 612 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U8); |
d8e538ec TG |
613 | if (r < 0) |
614 | return r; | |
44caa5e7 | 615 | |
4c641e99 | 616 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
f66eeb6b | 617 | if (r < 0) |
44caa5e7 | 618 | return r; |
f66eeb6b TG |
619 | else if ((size_t) r < sizeof(uint8_t)) |
620 | return -EIO; | |
44caa5e7 | 621 | |
73ae2b7d TG |
622 | if (data) |
623 | *data = *(uint8_t *) attr_data; | |
44caa5e7 SS |
624 | |
625 | return 0; | |
626 | } | |
627 | ||
1c4baffc | 628 | int sd_netlink_message_read_u16(sd_netlink_message *m, unsigned short type, uint16_t *data) { |
44caa5e7 | 629 | void *attr_data; |
4c641e99 TG |
630 | bool net_byteorder; |
631 | int r; | |
44caa5e7 | 632 | |
73ae2b7d TG |
633 | assert_return(m, -EINVAL); |
634 | ||
6c14ad61 | 635 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U16); |
d8e538ec TG |
636 | if (r < 0) |
637 | return r; | |
44caa5e7 | 638 | |
4c641e99 | 639 | r = netlink_message_read_internal(m, type, &attr_data, &net_byteorder); |
f66eeb6b | 640 | if (r < 0) |
44caa5e7 | 641 | return r; |
f66eeb6b TG |
642 | else if ((size_t) r < sizeof(uint16_t)) |
643 | return -EIO; | |
44caa5e7 | 644 | |
4c641e99 TG |
645 | if (data) { |
646 | if (net_byteorder) | |
647 | *data = be16toh(*(uint16_t *) attr_data); | |
648 | else | |
649 | *data = *(uint16_t *) attr_data; | |
650 | } | |
44caa5e7 SS |
651 | |
652 | return 0; | |
653 | } | |
654 | ||
1c4baffc | 655 | int sd_netlink_message_read_u32(sd_netlink_message *m, unsigned short type, uint32_t *data) { |
44caa5e7 | 656 | void *attr_data; |
4c641e99 TG |
657 | bool net_byteorder; |
658 | int r; | |
44caa5e7 | 659 | |
73ae2b7d TG |
660 | assert_return(m, -EINVAL); |
661 | ||
6c14ad61 | 662 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U32); |
d8e538ec TG |
663 | if (r < 0) |
664 | return r; | |
44caa5e7 | 665 | |
4c641e99 | 666 | r = netlink_message_read_internal(m, type, &attr_data, &net_byteorder); |
f66eeb6b | 667 | if (r < 0) |
44caa5e7 | 668 | return r; |
f66eeb6b TG |
669 | else if ((size_t)r < sizeof(uint32_t)) |
670 | return -EIO; | |
44caa5e7 | 671 | |
4c641e99 TG |
672 | if (data) { |
673 | if (net_byteorder) | |
674 | *data = be32toh(*(uint32_t *) attr_data); | |
675 | else | |
676 | *data = *(uint32_t *) attr_data; | |
677 | } | |
44caa5e7 SS |
678 | |
679 | return 0; | |
680 | } | |
681 | ||
1c4baffc | 682 | int sd_netlink_message_read_ether_addr(sd_netlink_message *m, unsigned short type, struct ether_addr *data) { |
4e9e7f18 SS |
683 | int r; |
684 | void *attr_data; | |
685 | ||
73ae2b7d TG |
686 | assert_return(m, -EINVAL); |
687 | ||
6c14ad61 | 688 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_ETHER_ADDR); |
d8e538ec TG |
689 | if (r < 0) |
690 | return r; | |
4e9e7f18 | 691 | |
4c641e99 | 692 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
f66eeb6b | 693 | if (r < 0) |
4e9e7f18 | 694 | return r; |
f66eeb6b TG |
695 | else if ((size_t)r < sizeof(struct ether_addr)) |
696 | return -EIO; | |
4e9e7f18 | 697 | |
73ae2b7d TG |
698 | if (data) |
699 | memcpy(data, attr_data, sizeof(struct ether_addr)); | |
4e9e7f18 SS |
700 | |
701 | return 0; | |
702 | } | |
703 | ||
1c4baffc | 704 | int sd_netlink_message_read_cache_info(sd_netlink_message *m, unsigned short type, struct ifa_cacheinfo *info) { |
aba496a5 UTL |
705 | int r; |
706 | void *attr_data; | |
707 | ||
73ae2b7d TG |
708 | assert_return(m, -EINVAL); |
709 | ||
6c14ad61 | 710 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_CACHE_INFO); |
aba496a5 UTL |
711 | if (r < 0) |
712 | return r; | |
713 | ||
4c641e99 | 714 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
aba496a5 UTL |
715 | if (r < 0) |
716 | return r; | |
717 | else if ((size_t)r < sizeof(struct ifa_cacheinfo)) | |
718 | return -EIO; | |
719 | ||
73ae2b7d TG |
720 | if (info) |
721 | memcpy(info, attr_data, sizeof(struct ifa_cacheinfo)); | |
aba496a5 UTL |
722 | |
723 | return 0; | |
724 | } | |
725 | ||
1c4baffc | 726 | int sd_netlink_message_read_in_addr(sd_netlink_message *m, unsigned short type, struct in_addr *data) { |
4e9e7f18 SS |
727 | int r; |
728 | void *attr_data; | |
729 | ||
73ae2b7d TG |
730 | assert_return(m, -EINVAL); |
731 | ||
6c14ad61 | 732 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
d8e538ec TG |
733 | if (r < 0) |
734 | return r; | |
4e9e7f18 | 735 | |
4c641e99 | 736 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
f66eeb6b | 737 | if (r < 0) |
4e9e7f18 | 738 | return r; |
f66eeb6b TG |
739 | else if ((size_t)r < sizeof(struct in_addr)) |
740 | return -EIO; | |
4e9e7f18 | 741 | |
73ae2b7d TG |
742 | if (data) |
743 | memcpy(data, attr_data, sizeof(struct in_addr)); | |
4e9e7f18 SS |
744 | |
745 | return 0; | |
746 | } | |
747 | ||
1c4baffc | 748 | int sd_netlink_message_read_in6_addr(sd_netlink_message *m, unsigned short type, struct in6_addr *data) { |
4e9e7f18 SS |
749 | int r; |
750 | void *attr_data; | |
751 | ||
73ae2b7d TG |
752 | assert_return(m, -EINVAL); |
753 | ||
6c14ad61 | 754 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
d8e538ec TG |
755 | if (r < 0) |
756 | return r; | |
4e9e7f18 | 757 | |
4c641e99 | 758 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
3dd215e0 | 759 | if (r < 0) |
4e9e7f18 | 760 | return r; |
3dd215e0 TG |
761 | else if ((size_t)r < sizeof(struct in6_addr)) |
762 | return -EIO; | |
4e9e7f18 | 763 | |
73ae2b7d TG |
764 | if (data) |
765 | memcpy(data, attr_data, sizeof(struct in6_addr)); | |
4e9e7f18 SS |
766 | |
767 | return 0; | |
768 | } | |
769 | ||
f663aeb8 TG |
770 | static int netlink_container_parse(sd_netlink_message *m, |
771 | struct netlink_container *container, | |
772 | int count, | |
773 | struct rtattr *rta, | |
14cb109d | 774 | unsigned rt_len) { |
f663aeb8 | 775 | _cleanup_free_ struct netlink_attribute *attributes = NULL; |
4203fc8b | 776 | |
f663aeb8 | 777 | attributes = new0(struct netlink_attribute, count); |
9ed794a3 | 778 | if (!attributes) |
4203fc8b TG |
779 | return -ENOMEM; |
780 | ||
4203fc8b | 781 | for (; RTA_OK(rta, rt_len); rta = RTA_NEXT(rta, rt_len)) { |
f663aeb8 TG |
782 | unsigned short type; |
783 | ||
4203fc8b TG |
784 | type = RTA_TYPE(rta); |
785 | ||
786 | /* if the kernel is newer than the headers we used | |
f663aeb8 | 787 | when building, we ignore out-of-range attributes */ |
4203fc8b TG |
788 | if (type >= count) |
789 | continue; | |
790 | ||
f1dd72c2 | 791 | if (attributes[type].offset != 0) |
4203fc8b TG |
792 | log_debug("rtnl: message parse - overwriting repeated attribute"); |
793 | ||
f663aeb8 | 794 | attributes[type].offset = (uint8_t *) rta - (uint8_t *) m->hdr; |
4c641e99 TG |
795 | attributes[type].nested = RTA_FLAGS(rta) & NLA_F_NESTED; |
796 | attributes[type].net_byteorder = RTA_FLAGS(rta) & NLA_F_NET_BYTEORDER; | |
4203fc8b TG |
797 | } |
798 | ||
ae2a15bc | 799 | container->attributes = TAKE_PTR(attributes); |
f663aeb8 | 800 | container->n_attributes = count; |
4203fc8b TG |
801 | |
802 | return 0; | |
803 | } | |
804 | ||
817d1cd8 | 805 | int sd_netlink_message_enter_container(sd_netlink_message *m, unsigned short type_id) { |
d8e538ec TG |
806 | const NLType *nl_type; |
807 | const NLTypeSystem *type_system; | |
3dd215e0 | 808 | void *container; |
817d1cd8 | 809 | uint16_t type; |
d8e538ec TG |
810 | size_t size; |
811 | int r; | |
3dd215e0 TG |
812 | |
813 | assert_return(m, -EINVAL); | |
814 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -EINVAL); | |
815 | ||
f663aeb8 | 816 | r = type_system_get_type(m->containers[m->n_containers].type_system, |
d8e538ec | 817 | &nl_type, |
817d1cd8 | 818 | type_id); |
3dd215e0 TG |
819 | if (r < 0) |
820 | return r; | |
3dd215e0 | 821 | |
817d1cd8 DH |
822 | type = type_get_type(nl_type); |
823 | ||
824 | if (type == NETLINK_TYPE_NESTED) { | |
f663aeb8 | 825 | r = type_system_get_type_system(m->containers[m->n_containers].type_system, |
d8e538ec | 826 | &type_system, |
817d1cd8 | 827 | type_id); |
d8e538ec TG |
828 | if (r < 0) |
829 | return r; | |
817d1cd8 | 830 | } else if (type == NETLINK_TYPE_UNION) { |
d8e538ec | 831 | const NLTypeSystemUnion *type_system_union; |
d8e538ec | 832 | |
f663aeb8 | 833 | r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, |
d8e538ec | 834 | &type_system_union, |
817d1cd8 | 835 | type_id); |
d8e538ec TG |
836 | if (r < 0) |
837 | return r; | |
838 | ||
4af7b60d TG |
839 | switch (type_system_union->match_type) { |
840 | case NL_MATCH_SIBLING: | |
841 | { | |
842 | const char *key; | |
843 | ||
1c4baffc | 844 | r = sd_netlink_message_read_string(m, type_system_union->match, &key); |
4af7b60d TG |
845 | if (r < 0) |
846 | return r; | |
847 | ||
848 | r = type_system_union_get_type_system(type_system_union, | |
849 | &type_system, | |
850 | key); | |
851 | if (r < 0) | |
852 | return r; | |
853 | ||
854 | break; | |
855 | } | |
856 | case NL_MATCH_PROTOCOL: | |
857 | { | |
858 | int family; | |
859 | ||
89489ef7 | 860 | r = sd_rtnl_message_get_family(m, &family); |
4af7b60d TG |
861 | if (r < 0) |
862 | return r; | |
863 | ||
864 | r = type_system_union_protocol_get_type_system(type_system_union, | |
865 | &type_system, | |
866 | family); | |
867 | if (r < 0) | |
868 | return r; | |
869 | ||
870 | break; | |
871 | } | |
872 | default: | |
1c4baffc | 873 | assert_not_reached("sd-netlink: invalid type system union type"); |
4af7b60d | 874 | } |
d8e538ec TG |
875 | } else |
876 | return -EINVAL; | |
877 | ||
4c641e99 | 878 | r = netlink_message_read_internal(m, type_id, &container, NULL); |
3dd215e0 TG |
879 | if (r < 0) |
880 | return r; | |
d8e538ec TG |
881 | else |
882 | size = (size_t)r; | |
3dd215e0 | 883 | |
313cefa1 | 884 | m->n_containers++; |
3dd215e0 | 885 | |
f663aeb8 TG |
886 | r = netlink_container_parse(m, |
887 | &m->containers[m->n_containers], | |
888 | type_system_get_count(type_system), | |
889 | container, | |
890 | size); | |
d8e538ec | 891 | if (r < 0) { |
313cefa1 | 892 | m->n_containers--; |
3dd215e0 | 893 | return r; |
d8e538ec | 894 | } |
3dd215e0 | 895 | |
f663aeb8 | 896 | m->containers[m->n_containers].type_system = type_system; |
3dd215e0 TG |
897 | |
898 | return 0; | |
899 | } | |
900 | ||
1c4baffc | 901 | int sd_netlink_message_exit_container(sd_netlink_message *m) { |
e5c4350b TG |
902 | assert_return(m, -EINVAL); |
903 | assert_return(m->sealed, -EINVAL); | |
904 | assert_return(m->n_containers > 0, -EINVAL); | |
905 | ||
a1e58e8e | 906 | m->containers[m->n_containers].attributes = mfree(m->containers[m->n_containers].attributes); |
f663aeb8 | 907 | m->containers[m->n_containers].type_system = NULL; |
3dd215e0 | 908 | |
313cefa1 | 909 | m->n_containers--; |
e5c4350b TG |
910 | |
911 | return 0; | |
912 | } | |
913 | ||
1c4baffc | 914 | uint32_t rtnl_message_get_serial(sd_netlink_message *m) { |
65f568bb | 915 | assert(m); |
9d0db178 | 916 | assert(m->hdr); |
65f568bb TG |
917 | |
918 | return m->hdr->nlmsg_seq; | |
919 | } | |
920 | ||
1c4baffc | 921 | int sd_netlink_message_is_error(sd_netlink_message *m) { |
45af44d4 TG |
922 | assert_return(m, 0); |
923 | assert_return(m->hdr, 0); | |
924 | ||
925 | return m->hdr->nlmsg_type == NLMSG_ERROR; | |
926 | } | |
927 | ||
1c4baffc | 928 | int sd_netlink_message_get_errno(sd_netlink_message *m) { |
65f568bb TG |
929 | struct nlmsgerr *err; |
930 | ||
e16bcf98 | 931 | assert_return(m, -EINVAL); |
9d0db178 | 932 | assert_return(m->hdr, -EINVAL); |
65f568bb | 933 | |
1c4baffc | 934 | if (!sd_netlink_message_is_error(m)) |
65f568bb TG |
935 | return 0; |
936 | ||
937 | err = NLMSG_DATA(m->hdr); | |
938 | ||
939 | return err->error; | |
940 | } | |
941 | ||
1c4baffc | 942 | int sd_netlink_message_rewind(sd_netlink_message *m) { |
817d1cd8 | 943 | const NLType *nl_type; |
05d0c2e3 | 944 | const NLTypeSystem *type_system_root; |
817d1cd8 DH |
945 | uint16_t type; |
946 | size_t size; | |
3dd215e0 TG |
947 | unsigned i; |
948 | int r; | |
0fc7531b TG |
949 | |
950 | assert_return(m, -EINVAL); | |
0fc7531b | 951 | |
3dd215e0 TG |
952 | /* don't allow appending to message once parsed */ |
953 | if (!m->sealed) | |
954 | rtnl_message_seal(m); | |
955 | ||
05d0c2e3 JT |
956 | type_system_root = type_system_get_root(m->protocol); |
957 | ||
1f6b4113 | 958 | for (i = 1; i <= m->n_containers; i++) |
a1e58e8e | 959 | m->containers[i].attributes = mfree(m->containers[i].attributes); |
3dd215e0 TG |
960 | |
961 | m->n_containers = 0; | |
962 | ||
ece174c5 | 963 | if (m->containers[0].attributes) |
3dd215e0 TG |
964 | /* top-level attributes have already been parsed */ |
965 | return 0; | |
3dd215e0 | 966 | |
d8e538ec TG |
967 | assert(m->hdr); |
968 | ||
05d0c2e3 | 969 | r = type_system_get_type(type_system_root, &nl_type, m->hdr->nlmsg_type); |
d8e538ec TG |
970 | if (r < 0) |
971 | return r; | |
972 | ||
817d1cd8 DH |
973 | type = type_get_type(nl_type); |
974 | size = type_get_size(nl_type); | |
975 | ||
976 | if (type == NETLINK_TYPE_NESTED) { | |
c658008f | 977 | const NLTypeSystem *type_system; |
d8e538ec | 978 | |
817d1cd8 | 979 | type_get_type_system(nl_type, &type_system); |
d8e538ec | 980 | |
f663aeb8 | 981 | m->containers[0].type_system = type_system; |
d8e538ec | 982 | |
f663aeb8 TG |
983 | r = netlink_container_parse(m, |
984 | &m->containers[m->n_containers], | |
985 | type_system_get_count(type_system), | |
986 | (struct rtattr*)((uint8_t*)NLMSG_DATA(m->hdr) + NLMSG_ALIGN(size)), | |
987 | NLMSG_PAYLOAD(m->hdr, size)); | |
d8e538ec TG |
988 | if (r < 0) |
989 | return r; | |
0fc7531b TG |
990 | } |
991 | ||
992 | return 0; | |
993 | } | |
3dd215e0 | 994 | |
1c4baffc | 995 | void rtnl_message_seal(sd_netlink_message *m) { |
3dd215e0 TG |
996 | assert(m); |
997 | assert(!m->sealed); | |
998 | ||
999 | m->sealed = true; | |
1000 | } | |
1403f45a | 1001 | |
1c4baffc | 1002 | sd_netlink_message *sd_netlink_message_next(sd_netlink_message *m) { |
1403f45a TG |
1003 | assert_return(m, NULL); |
1004 | ||
1005 | return m->next; | |
1006 | } |