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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
65f568bb | 2 | /*** |
96b2fb93 | 3 | Copyright © 2013 Tom Gundersen <teg@jklm.no> |
65f568bb TG |
4 | ***/ |
5 | ||
6 | #include <netinet/in.h> | |
65f568bb TG |
7 | #include <stdbool.h> |
8 | #include <unistd.h> | |
9 | ||
07630cea LP |
10 | #include "sd-netlink.h" |
11 | ||
b5efdb8a | 12 | #include "alloc-util.h" |
f97b34a6 | 13 | #include "format-util.h" |
d5eff740 | 14 | #include "missing.h" |
1c4baffc TG |
15 | #include "netlink-internal.h" |
16 | #include "netlink-types.h" | |
07630cea LP |
17 | #include "netlink-util.h" |
18 | #include "refcnt.h" | |
19 | #include "socket-util.h" | |
20 | #include "util.h" | |
65f568bb | 21 | |
f663aeb8 | 22 | #define GET_CONTAINER(m, i) ((i) < (m)->n_containers ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->containers[i].offset) : NULL) |
313cefa1 | 23 | #define PUSH_CONTAINER(m, new) (m)->container_offsets[(m)->n_containers++] = (uint8_t*)(new) - (uint8_t*)(m)->hdr; |
4ebe732c | 24 | |
0a2478a9 | 25 | #define RTA_TYPE(rta) ((rta)->rta_type & NLA_TYPE_MASK) |
4c641e99 | 26 | #define RTA_FLAGS(rta) ((rta)->rta_type & ~NLA_TYPE_MASK) |
0a2478a9 | 27 | |
89489ef7 | 28 | int message_new_empty(sd_netlink *rtnl, sd_netlink_message **ret) { |
1c4baffc | 29 | sd_netlink_message *m; |
65f568bb TG |
30 | |
31 | assert_return(ret, -EINVAL); | |
65f568bb | 32 | |
f131770b | 33 | /* Note that 'rtnl' is currently unused, if we start using it internally |
8c578303 | 34 | we must take care to avoid problems due to mutual references between |
ff9b60f3 | 35 | buses and their queued messages. See sd-bus. |
8c578303 TG |
36 | */ |
37 | ||
1c4baffc | 38 | m = new0(sd_netlink_message, 1); |
65f568bb TG |
39 | if (!m) |
40 | return -ENOMEM; | |
41 | ||
65f568bb | 42 | m->n_ref = REFCNT_INIT; |
05d0c2e3 | 43 | m->protocol = rtnl->protocol; |
65f568bb TG |
44 | m->sealed = false; |
45 | ||
46 | *ret = m; | |
47 | ||
48 | return 0; | |
49 | } | |
50 | ||
1c4baffc | 51 | int message_new(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t type) { |
4afd3348 | 52 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
d8e538ec | 53 | const NLType *nl_type; |
05d0c2e3 | 54 | const NLTypeSystem *type_system_root; |
d8e538ec TG |
55 | size_t size; |
56 | int r; | |
57 | ||
05d0c2e3 JT |
58 | assert_return(rtnl, -EINVAL); |
59 | ||
60 | type_system_root = type_system_get_root(rtnl->protocol); | |
61 | ||
62 | r = type_system_get_type(type_system_root, &nl_type, type); | |
d8e538ec TG |
63 | if (r < 0) |
64 | return r; | |
65 | ||
12b7dff4 DH |
66 | if (type_get_type(nl_type) != NETLINK_TYPE_NESTED) |
67 | return -EINVAL; | |
68 | ||
1b89cf56 | 69 | r = message_new_empty(rtnl, &m); |
d8e538ec TG |
70 | if (r < 0) |
71 | return r; | |
72 | ||
817d1cd8 | 73 | size = NLMSG_SPACE(type_get_size(nl_type)); |
1b89cf56 TG |
74 | |
75 | assert(size >= sizeof(struct nlmsghdr)); | |
76 | m->hdr = malloc0(size); | |
77 | if (!m->hdr) | |
78 | return -ENOMEM; | |
79 | ||
80 | m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; | |
81 | ||
f663aeb8 | 82 | type_get_type_system(nl_type, &m->containers[0].type_system); |
1b89cf56 TG |
83 | m->hdr->nlmsg_len = size; |
84 | m->hdr->nlmsg_type = type; | |
85 | ||
1cc6c93a | 86 | *ret = TAKE_PTR(m); |
d8e538ec TG |
87 | |
88 | return 0; | |
89 | } | |
90 | ||
1c4baffc | 91 | int sd_netlink_message_request_dump(sd_netlink_message *m, int dump) { |
6e20c8f8 TG |
92 | assert_return(m, -EINVAL); |
93 | assert_return(m->hdr, -EINVAL); | |
bce67bbe SS |
94 | |
95 | assert_return(IN_SET(m->hdr->nlmsg_type, RTM_GETLINK, RTM_GETADDR, RTM_GETROUTE, RTM_GETNEIGH, RTM_GETRULE, RTM_GETADDRLABEL), -EINVAL); | |
6e20c8f8 | 96 | |
5883ff60 | 97 | SET_FLAG(m->hdr->nlmsg_flags, NLM_F_DUMP, dump); |
6e20c8f8 TG |
98 | |
99 | return 0; | |
100 | } | |
101 | ||
1c4baffc | 102 | sd_netlink_message *sd_netlink_message_ref(sd_netlink_message *m) { |
f1dd72c2 LP |
103 | if (!m) |
104 | return NULL; | |
65f568bb | 105 | |
f1dd72c2 | 106 | assert_se(REFCNT_INC(m->n_ref) >= 2); |
65f568bb TG |
107 | return m; |
108 | } | |
109 | ||
1c4baffc | 110 | sd_netlink_message *sd_netlink_message_unref(sd_netlink_message *m) { |
82e4eda6 DH |
111 | sd_netlink_message *t; |
112 | ||
113 | while (m && REFCNT_DEC(m->n_ref) == 0) { | |
3dd215e0 TG |
114 | unsigned i; |
115 | ||
65f568bb | 116 | free(m->hdr); |
3dd215e0 | 117 | |
9f5bbfe3 | 118 | for (i = 0; i <= m->n_containers; i++) |
f663aeb8 | 119 | free(m->containers[i].attributes); |
3dd215e0 | 120 | |
82e4eda6 DH |
121 | t = m; |
122 | m = m->next; | |
123 | free(t); | |
65f568bb TG |
124 | } |
125 | ||
126 | return NULL; | |
127 | } | |
128 | ||
1c4baffc | 129 | int sd_netlink_message_get_type(sd_netlink_message *m, uint16_t *type) { |
65f568bb TG |
130 | assert_return(m, -EINVAL); |
131 | assert_return(type, -EINVAL); | |
132 | ||
133 | *type = m->hdr->nlmsg_type; | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
c06cb593 SS |
138 | int sd_netlink_message_set_flags(sd_netlink_message *m, uint16_t flags) { |
139 | assert_return(m, -EINVAL); | |
140 | assert_return(flags, -EINVAL); | |
141 | ||
142 | m->hdr->nlmsg_flags = flags; | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
1c4baffc | 147 | int sd_netlink_message_is_broadcast(sd_netlink_message *m) { |
1f0db3ed TG |
148 | assert_return(m, -EINVAL); |
149 | ||
3f42446d | 150 | return m->broadcast; |
1f0db3ed TG |
151 | } |
152 | ||
4ebe732c ZJS |
153 | /* If successful the updated message will be correctly aligned, if |
154 | unsuccessful the old message is untouched. */ | |
1c4baffc | 155 | static int add_rtattr(sd_netlink_message *m, unsigned short type, const void *data, size_t data_length) { |
7ca1d319 TG |
156 | uint32_t rta_length; |
157 | size_t message_length, padding_length; | |
65f568bb TG |
158 | struct nlmsghdr *new_hdr; |
159 | struct rtattr *rta; | |
8e337e64 | 160 | char *padding; |
5a081409 | 161 | unsigned i; |
7ca1d319 | 162 | int offset; |
65f568bb | 163 | |
33125ac5 TG |
164 | assert(m); |
165 | assert(m->hdr); | |
e5c4350b | 166 | assert(!m->sealed); |
33125ac5 | 167 | assert(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len); |
7ca1d319 TG |
168 | assert(!data || data_length); |
169 | ||
170 | /* get offset of the new attribute */ | |
171 | offset = m->hdr->nlmsg_len; | |
65f568bb | 172 | |
8e337e64 | 173 | /* get the size of the new rta attribute (with padding at the end) */ |
65f568bb | 174 | rta_length = RTA_LENGTH(data_length); |
4ebe732c ZJS |
175 | |
176 | /* get the new message size (with padding at the end) */ | |
7ca1d319 | 177 | message_length = offset + RTA_ALIGN(rta_length); |
65f568bb | 178 | |
05d0c2e3 JT |
179 | /* buffer should be smaller than both one page or 8K to be accepted by the kernel */ |
180 | if (message_length > MIN(page_size(), 8192UL)) | |
181 | return -ENOBUFS; | |
182 | ||
65f568bb TG |
183 | /* realloc to fit the new attribute */ |
184 | new_hdr = realloc(m->hdr, message_length); | |
185 | if (!new_hdr) | |
186 | return -ENOMEM; | |
187 | m->hdr = new_hdr; | |
188 | ||
189 | /* get pointer to the attribute we are about to add */ | |
7ca1d319 | 190 | rta = (struct rtattr *) ((uint8_t *) m->hdr + offset); |
65f568bb | 191 | |
5a081409 TG |
192 | /* if we are inside containers, extend them */ |
193 | for (i = 0; i < m->n_containers; i++) | |
7ca1d319 | 194 | GET_CONTAINER(m, i)->rta_len += message_length - offset; |
33125ac5 | 195 | |
65f568bb TG |
196 | /* fill in the attribute */ |
197 | rta->rta_type = type; | |
198 | rta->rta_len = rta_length; | |
7ca1d319 | 199 | if (data) |
33125ac5 TG |
200 | /* we don't deal with the case where the user lies about the type |
201 | * and gives us too little data (so don't do that) | |
7ca1d319 | 202 | */ |
33125ac5 | 203 | padding = mempcpy(RTA_DATA(rta), data, data_length); |
b8cc01a2 SS |
204 | |
205 | else | |
7ca1d319 TG |
206 | /* if no data was passed, make sure we still initialize the padding |
207 | note that we can have data_length > 0 (used by some containers) */ | |
208 | padding = RTA_DATA(rta); | |
65f568bb | 209 | |
7ca1d319 TG |
210 | /* make sure also the padding at the end of the message is initialized */ |
211 | padding_length = (uint8_t*)m->hdr + message_length - (uint8_t*)padding; | |
212 | memzero(padding, padding_length); | |
213 | ||
4ebe732c ZJS |
214 | /* update message size */ |
215 | m->hdr->nlmsg_len = message_length; | |
216 | ||
7ca1d319 | 217 | return offset; |
65f568bb TG |
218 | } |
219 | ||
6c14ad61 | 220 | static int message_attribute_has_type(sd_netlink_message *m, size_t *out_size, uint16_t attribute_type, uint16_t data_type) { |
d8e538ec TG |
221 | const NLType *type; |
222 | int r; | |
223 | ||
6c14ad61 DH |
224 | assert(m); |
225 | ||
f663aeb8 | 226 | r = type_system_get_type(m->containers[m->n_containers].type_system, &type, attribute_type); |
d8e538ec TG |
227 | if (r < 0) |
228 | return r; | |
229 | ||
817d1cd8 | 230 | if (type_get_type(type) != data_type) |
d8e538ec TG |
231 | return -EINVAL; |
232 | ||
6c14ad61 DH |
233 | if (out_size) |
234 | *out_size = type_get_size(type); | |
235 | return 0; | |
d8e538ec TG |
236 | } |
237 | ||
1c4baffc | 238 | int sd_netlink_message_append_string(sd_netlink_message *m, unsigned short type, const char *data) { |
d8e538ec | 239 | size_t length, size; |
0a0dc69b | 240 | int r; |
65f568bb TG |
241 | |
242 | assert_return(m, -EINVAL); | |
e5c4350b | 243 | assert_return(!m->sealed, -EPERM); |
65f568bb TG |
244 | assert_return(data, -EINVAL); |
245 | ||
6c14ad61 | 246 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_STRING); |
0a0dc69b TG |
247 | if (r < 0) |
248 | return r; | |
65f568bb | 249 | |
d8e538ec | 250 | if (size) { |
3072eecf LP |
251 | length = strnlen(data, size+1); |
252 | if (length > size) | |
d8e538ec TG |
253 | return -EINVAL; |
254 | } else | |
255 | length = strlen(data); | |
33125ac5 | 256 | |
d8e538ec | 257 | r = add_rtattr(m, type, data, length + 1); |
0a0dc69b TG |
258 | if (r < 0) |
259 | return r; | |
260 | ||
261 | return 0; | |
262 | } | |
263 | ||
c06aead0 SS |
264 | int sd_netlink_message_append_flag(sd_netlink_message *m, unsigned short type) { |
265 | size_t size; | |
266 | int r; | |
267 | ||
268 | assert_return(m, -EINVAL); | |
269 | assert_return(!m->sealed, -EPERM); | |
270 | ||
271 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_FLAG); | |
272 | if (r < 0) | |
273 | return r; | |
274 | ||
275 | r = add_rtattr(m, type, NULL, 0); | |
276 | if (r < 0) | |
277 | return r; | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
1c4baffc | 282 | int sd_netlink_message_append_u8(sd_netlink_message *m, unsigned short type, uint8_t data) { |
7b179640 SS |
283 | int r; |
284 | ||
285 | assert_return(m, -EINVAL); | |
286 | assert_return(!m->sealed, -EPERM); | |
287 | ||
6c14ad61 | 288 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U8); |
7b179640 SS |
289 | if (r < 0) |
290 | return r; | |
291 | ||
7b179640 SS |
292 | r = add_rtattr(m, type, &data, sizeof(uint8_t)); |
293 | if (r < 0) | |
294 | return r; | |
295 | ||
296 | return 0; | |
297 | } | |
298 | ||
1c4baffc | 299 | int sd_netlink_message_append_u16(sd_netlink_message *m, unsigned short type, uint16_t data) { |
01b36069 TG |
300 | int r; |
301 | ||
302 | assert_return(m, -EINVAL); | |
e5c4350b | 303 | assert_return(!m->sealed, -EPERM); |
01b36069 | 304 | |
6c14ad61 | 305 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U16); |
01b36069 TG |
306 | if (r < 0) |
307 | return r; | |
308 | ||
01b36069 TG |
309 | r = add_rtattr(m, type, &data, sizeof(uint16_t)); |
310 | if (r < 0) | |
311 | return r; | |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
1c4baffc | 316 | int sd_netlink_message_append_u32(sd_netlink_message *m, unsigned short type, uint32_t data) { |
0a0dc69b TG |
317 | int r; |
318 | ||
319 | assert_return(m, -EINVAL); | |
e5c4350b | 320 | assert_return(!m->sealed, -EPERM); |
0a0dc69b | 321 | |
6c14ad61 | 322 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U32); |
0a0dc69b TG |
323 | if (r < 0) |
324 | return r; | |
325 | ||
4d47756b | 326 | r = add_rtattr(m, type, &data, sizeof(uint32_t)); |
0a0dc69b TG |
327 | if (r < 0) |
328 | return r; | |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
17af840b SS |
333 | int sd_netlink_message_append_data(sd_netlink_message *m, unsigned short type, const void *data, size_t len) { |
334 | int r; | |
335 | ||
336 | assert_return(m, -EINVAL); | |
337 | assert_return(!m->sealed, -EPERM); | |
338 | ||
b8cc01a2 | 339 | r = add_rtattr(m, type, data, len); |
17af840b SS |
340 | if (r < 0) |
341 | return r; | |
342 | ||
343 | return 0; | |
344 | } | |
345 | ||
1c4baffc | 346 | int sd_netlink_message_append_in_addr(sd_netlink_message *m, unsigned short type, const struct in_addr *data) { |
0a0dc69b TG |
347 | int r; |
348 | ||
349 | assert_return(m, -EINVAL); | |
e5c4350b | 350 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
351 | assert_return(data, -EINVAL); |
352 | ||
6c14ad61 | 353 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
0a0dc69b TG |
354 | if (r < 0) |
355 | return r; | |
356 | ||
4d47756b | 357 | r = add_rtattr(m, type, data, sizeof(struct in_addr)); |
0a0dc69b TG |
358 | if (r < 0) |
359 | return r; | |
360 | ||
361 | return 0; | |
362 | } | |
363 | ||
1c4baffc | 364 | int sd_netlink_message_append_in6_addr(sd_netlink_message *m, unsigned short type, const struct in6_addr *data) { |
0a0dc69b TG |
365 | int r; |
366 | ||
367 | assert_return(m, -EINVAL); | |
e5c4350b | 368 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
369 | assert_return(data, -EINVAL); |
370 | ||
6c14ad61 | 371 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
0a0dc69b TG |
372 | if (r < 0) |
373 | return r; | |
374 | ||
4d47756b | 375 | r = add_rtattr(m, type, data, sizeof(struct in6_addr)); |
0a0dc69b TG |
376 | if (r < 0) |
377 | return r; | |
378 | ||
379 | return 0; | |
380 | } | |
381 | ||
1c4baffc | 382 | int sd_netlink_message_append_ether_addr(sd_netlink_message *m, unsigned short type, const struct ether_addr *data) { |
0a0dc69b TG |
383 | int r; |
384 | ||
385 | assert_return(m, -EINVAL); | |
e5c4350b | 386 | assert_return(!m->sealed, -EPERM); |
0a0dc69b TG |
387 | assert_return(data, -EINVAL); |
388 | ||
6c14ad61 | 389 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_ETHER_ADDR); |
d8e538ec TG |
390 | if (r < 0) |
391 | return r; | |
0a0dc69b | 392 | |
b9eaf3d1 | 393 | r = add_rtattr(m, type, data, ETH_ALEN); |
0a0dc69b TG |
394 | if (r < 0) |
395 | return r; | |
396 | ||
397 | return 0; | |
65f568bb TG |
398 | } |
399 | ||
1c4baffc | 400 | int sd_netlink_message_append_cache_info(sd_netlink_message *m, unsigned short type, const struct ifa_cacheinfo *info) { |
aba496a5 UTL |
401 | int r; |
402 | ||
403 | assert_return(m, -EINVAL); | |
404 | assert_return(!m->sealed, -EPERM); | |
405 | assert_return(info, -EINVAL); | |
406 | ||
6c14ad61 | 407 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_CACHE_INFO); |
aba496a5 UTL |
408 | if (r < 0) |
409 | return r; | |
410 | ||
411 | r = add_rtattr(m, type, info, sizeof(struct ifa_cacheinfo)); | |
412 | if (r < 0) | |
413 | return r; | |
414 | ||
415 | return 0; | |
416 | } | |
417 | ||
1c4baffc | 418 | int sd_netlink_message_open_container(sd_netlink_message *m, unsigned short type) { |
d8e538ec TG |
419 | size_t size; |
420 | int r; | |
33125ac5 | 421 | |
65f568bb | 422 | assert_return(m, -EINVAL); |
e5c4350b | 423 | assert_return(!m->sealed, -EPERM); |
7ca1d319 | 424 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -ERANGE); |
33125ac5 | 425 | |
6c14ad61 | 426 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_NESTED); |
4af7b60d TG |
427 | if (r < 0) { |
428 | const NLTypeSystemUnion *type_system_union; | |
429 | int family; | |
430 | ||
6c14ad61 | 431 | r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_UNION); |
4af7b60d TG |
432 | if (r < 0) |
433 | return r; | |
4af7b60d | 434 | |
89489ef7 | 435 | r = sd_rtnl_message_get_family(m, &family); |
4af7b60d TG |
436 | if (r < 0) |
437 | return r; | |
438 | ||
f663aeb8 | 439 | r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, &type_system_union, type); |
4af7b60d TG |
440 | if (r < 0) |
441 | return r; | |
442 | ||
443 | r = type_system_union_protocol_get_type_system(type_system_union, | |
f663aeb8 | 444 | &m->containers[m->n_containers + 1].type_system, |
4af7b60d TG |
445 | family); |
446 | if (r < 0) | |
447 | return r; | |
448 | } else { | |
f663aeb8 TG |
449 | r = type_system_get_type_system(m->containers[m->n_containers].type_system, |
450 | &m->containers[m->n_containers + 1].type_system, | |
4af7b60d TG |
451 | type); |
452 | if (r < 0) | |
453 | return r; | |
454 | } | |
31a4e153 | 455 | |
fcf81a54 | 456 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, size); |
d8e538ec TG |
457 | if (r < 0) |
458 | return r; | |
459 | ||
313cefa1 | 460 | m->containers[m->n_containers++].offset = r; |
7ca1d319 | 461 | |
d8e538ec TG |
462 | return 0; |
463 | } | |
464 | ||
1c4baffc | 465 | int sd_netlink_message_open_container_union(sd_netlink_message *m, unsigned short type, const char *key) { |
d8e538ec TG |
466 | const NLTypeSystemUnion *type_system_union; |
467 | int r; | |
468 | ||
469 | assert_return(m, -EINVAL); | |
470 | assert_return(!m->sealed, -EPERM); | |
471 | ||
f663aeb8 | 472 | r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, &type_system_union, type); |
d8e538ec TG |
473 | if (r < 0) |
474 | return r; | |
475 | ||
476 | r = type_system_union_get_type_system(type_system_union, | |
f663aeb8 | 477 | &m->containers[m->n_containers + 1].type_system, |
d8e538ec TG |
478 | key); |
479 | if (r < 0) | |
480 | return r; | |
33125ac5 | 481 | |
1c4baffc | 482 | r = sd_netlink_message_append_string(m, type_system_union->match, key); |
d8e538ec TG |
483 | if (r < 0) |
484 | return r; | |
485 | ||
05d0c2e3 | 486 | /* do we ever need non-null size */ |
da041d69 | 487 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, 0); |
d8e538ec TG |
488 | if (r < 0) |
489 | return r; | |
490 | ||
313cefa1 | 491 | m->containers[m->n_containers++].offset = r; |
7ca1d319 | 492 | |
d8e538ec | 493 | return 0; |
33125ac5 TG |
494 | } |
495 | ||
1c4baffc | 496 | int sd_netlink_message_close_container(sd_netlink_message *m) { |
33125ac5 | 497 | assert_return(m, -EINVAL); |
e5c4350b | 498 | assert_return(!m->sealed, -EPERM); |
5a081409 | 499 | assert_return(m->n_containers > 0, -EINVAL); |
33125ac5 | 500 | |
f663aeb8 | 501 | m->containers[m->n_containers].type_system = NULL; |
05d0c2e3 JT |
502 | m->containers[m->n_containers].offset = 0; |
503 | m->n_containers--; | |
504 | ||
505 | return 0; | |
506 | } | |
507 | ||
508 | int sd_netlink_message_open_array(sd_netlink_message *m, uint16_t type) { | |
509 | int r; | |
510 | ||
511 | assert_return(m, -EINVAL); | |
512 | assert_return(!m->sealed, -EPERM); | |
513 | assert_return(m->n_containers > 0, -EINVAL); | |
514 | ||
515 | r = add_rtattr(m, type | NLA_F_NESTED, NULL, 0); | |
516 | if (r < 0) | |
517 | return r; | |
518 | ||
519 | m->containers[m->n_containers].offset = r; | |
520 | m->n_containers++; | |
521 | m->containers[m->n_containers].type_system = m->containers[m->n_containers - 1].type_system; | |
522 | ||
523 | return 0; | |
524 | } | |
525 | ||
526 | int sd_netlink_message_cancel_array(sd_netlink_message *m) { | |
527 | unsigned i; | |
528 | uint32_t rta_len; | |
529 | ||
530 | assert_return(m, -EINVAL); | |
531 | assert_return(!m->sealed, -EPERM); | |
532 | assert_return(m->n_containers > 1, -EINVAL); | |
533 | ||
534 | rta_len = GET_CONTAINER(m, (m->n_containers - 1))->rta_len; | |
535 | ||
536 | for (i = 0; i < m->n_containers; i++) | |
537 | GET_CONTAINER(m, i)->rta_len -= rta_len; | |
538 | ||
539 | m->hdr->nlmsg_len -= rta_len; | |
540 | ||
313cefa1 | 541 | m->n_containers--; |
05d0c2e3 | 542 | m->containers[m->n_containers].type_system = NULL; |
33125ac5 TG |
543 | |
544 | return 0; | |
545 | } | |
546 | ||
4c641e99 | 547 | static int netlink_message_read_internal(sd_netlink_message *m, unsigned short type, void **data, bool *net_byteorder) { |
f663aeb8 | 548 | struct netlink_attribute *attribute; |
f66eeb6b TG |
549 | struct rtattr *rta; |
550 | ||
44caa5e7 SS |
551 | assert_return(m, -EINVAL); |
552 | assert_return(m->sealed, -EPERM); | |
553 | assert_return(data, -EINVAL); | |
f1dd72c2 | 554 | |
0610939d | 555 | assert(m->n_containers < RTNL_CONTAINER_DEPTH); |
f663aeb8 TG |
556 | assert(m->containers[m->n_containers].attributes); |
557 | assert(type < m->containers[m->n_containers].n_attributes); | |
44caa5e7 | 558 | |
f663aeb8 TG |
559 | attribute = &m->containers[m->n_containers].attributes[type]; |
560 | ||
f1dd72c2 | 561 | if (attribute->offset == 0) |
44caa5e7 SS |
562 | return -ENODATA; |
563 | ||
f663aeb8 | 564 | rta = (struct rtattr*)((uint8_t *) m->hdr + attribute->offset); |
44caa5e7 | 565 | |
f66eeb6b TG |
566 | *data = RTA_DATA(rta); |
567 | ||
4c641e99 TG |
568 | if (net_byteorder) |
569 | *net_byteorder = attribute->net_byteorder; | |
570 | ||
f66eeb6b | 571 | return RTA_PAYLOAD(rta); |
44caa5e7 SS |
572 | } |
573 | ||
1c4baffc | 574 | int sd_netlink_message_read_string(sd_netlink_message *m, unsigned short type, const char **data) { |
44caa5e7 SS |
575 | int r; |
576 | void *attr_data; | |
577 | ||
73ae2b7d TG |
578 | assert_return(m, -EINVAL); |
579 | ||
6c14ad61 | 580 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_STRING); |
d8e538ec TG |
581 | if (r < 0) |
582 | return r; | |
44caa5e7 | 583 | |
4c641e99 | 584 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
f66eeb6b | 585 | if (r < 0) |
44caa5e7 | 586 | return r; |
f66eeb6b TG |
587 | else if (strnlen(attr_data, r) >= (size_t) r) |
588 | return -EIO; | |
44caa5e7 | 589 | |
73ae2b7d TG |
590 | if (data) |
591 | *data = (const char *) attr_data; | |
44caa5e7 SS |
592 | |
593 | return 0; | |
594 | } | |
595 | ||
1c4baffc | 596 | int sd_netlink_message_read_u8(sd_netlink_message *m, unsigned short type, uint8_t *data) { |
44caa5e7 SS |
597 | int r; |
598 | void *attr_data; | |
599 | ||
73ae2b7d TG |
600 | assert_return(m, -EINVAL); |
601 | ||
6c14ad61 | 602 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U8); |
d8e538ec TG |
603 | if (r < 0) |
604 | return r; | |
44caa5e7 | 605 | |
4c641e99 | 606 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
f66eeb6b | 607 | if (r < 0) |
44caa5e7 | 608 | return r; |
f66eeb6b TG |
609 | else if ((size_t) r < sizeof(uint8_t)) |
610 | return -EIO; | |
44caa5e7 | 611 | |
73ae2b7d TG |
612 | if (data) |
613 | *data = *(uint8_t *) attr_data; | |
44caa5e7 SS |
614 | |
615 | return 0; | |
616 | } | |
617 | ||
1c4baffc | 618 | int sd_netlink_message_read_u16(sd_netlink_message *m, unsigned short type, uint16_t *data) { |
44caa5e7 | 619 | void *attr_data; |
4c641e99 TG |
620 | bool net_byteorder; |
621 | int r; | |
44caa5e7 | 622 | |
73ae2b7d TG |
623 | assert_return(m, -EINVAL); |
624 | ||
6c14ad61 | 625 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U16); |
d8e538ec TG |
626 | if (r < 0) |
627 | return r; | |
44caa5e7 | 628 | |
4c641e99 | 629 | r = netlink_message_read_internal(m, type, &attr_data, &net_byteorder); |
f66eeb6b | 630 | if (r < 0) |
44caa5e7 | 631 | return r; |
f66eeb6b TG |
632 | else if ((size_t) r < sizeof(uint16_t)) |
633 | return -EIO; | |
44caa5e7 | 634 | |
4c641e99 TG |
635 | if (data) { |
636 | if (net_byteorder) | |
637 | *data = be16toh(*(uint16_t *) attr_data); | |
638 | else | |
639 | *data = *(uint16_t *) attr_data; | |
640 | } | |
44caa5e7 SS |
641 | |
642 | return 0; | |
643 | } | |
644 | ||
1c4baffc | 645 | int sd_netlink_message_read_u32(sd_netlink_message *m, unsigned short type, uint32_t *data) { |
44caa5e7 | 646 | void *attr_data; |
4c641e99 TG |
647 | bool net_byteorder; |
648 | int r; | |
44caa5e7 | 649 | |
73ae2b7d TG |
650 | assert_return(m, -EINVAL); |
651 | ||
6c14ad61 | 652 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_U32); |
d8e538ec TG |
653 | if (r < 0) |
654 | return r; | |
44caa5e7 | 655 | |
4c641e99 | 656 | r = netlink_message_read_internal(m, type, &attr_data, &net_byteorder); |
f66eeb6b | 657 | if (r < 0) |
44caa5e7 | 658 | return r; |
f66eeb6b TG |
659 | else if ((size_t)r < sizeof(uint32_t)) |
660 | return -EIO; | |
44caa5e7 | 661 | |
4c641e99 TG |
662 | if (data) { |
663 | if (net_byteorder) | |
664 | *data = be32toh(*(uint32_t *) attr_data); | |
665 | else | |
666 | *data = *(uint32_t *) attr_data; | |
667 | } | |
44caa5e7 SS |
668 | |
669 | return 0; | |
670 | } | |
671 | ||
1c4baffc | 672 | int sd_netlink_message_read_ether_addr(sd_netlink_message *m, unsigned short type, struct ether_addr *data) { |
4e9e7f18 SS |
673 | int r; |
674 | void *attr_data; | |
675 | ||
73ae2b7d TG |
676 | assert_return(m, -EINVAL); |
677 | ||
6c14ad61 | 678 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_ETHER_ADDR); |
d8e538ec TG |
679 | if (r < 0) |
680 | return r; | |
4e9e7f18 | 681 | |
4c641e99 | 682 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
f66eeb6b | 683 | if (r < 0) |
4e9e7f18 | 684 | return r; |
f66eeb6b TG |
685 | else if ((size_t)r < sizeof(struct ether_addr)) |
686 | return -EIO; | |
4e9e7f18 | 687 | |
73ae2b7d TG |
688 | if (data) |
689 | memcpy(data, attr_data, sizeof(struct ether_addr)); | |
4e9e7f18 SS |
690 | |
691 | return 0; | |
692 | } | |
693 | ||
1c4baffc | 694 | int sd_netlink_message_read_cache_info(sd_netlink_message *m, unsigned short type, struct ifa_cacheinfo *info) { |
aba496a5 UTL |
695 | int r; |
696 | void *attr_data; | |
697 | ||
73ae2b7d TG |
698 | assert_return(m, -EINVAL); |
699 | ||
6c14ad61 | 700 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_CACHE_INFO); |
aba496a5 UTL |
701 | if (r < 0) |
702 | return r; | |
703 | ||
4c641e99 | 704 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
aba496a5 UTL |
705 | if (r < 0) |
706 | return r; | |
707 | else if ((size_t)r < sizeof(struct ifa_cacheinfo)) | |
708 | return -EIO; | |
709 | ||
73ae2b7d TG |
710 | if (info) |
711 | memcpy(info, attr_data, sizeof(struct ifa_cacheinfo)); | |
aba496a5 UTL |
712 | |
713 | return 0; | |
714 | } | |
715 | ||
1c4baffc | 716 | int sd_netlink_message_read_in_addr(sd_netlink_message *m, unsigned short type, struct in_addr *data) { |
4e9e7f18 SS |
717 | int r; |
718 | void *attr_data; | |
719 | ||
73ae2b7d TG |
720 | assert_return(m, -EINVAL); |
721 | ||
6c14ad61 | 722 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
d8e538ec TG |
723 | if (r < 0) |
724 | return r; | |
4e9e7f18 | 725 | |
4c641e99 | 726 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
f66eeb6b | 727 | if (r < 0) |
4e9e7f18 | 728 | return r; |
f66eeb6b TG |
729 | else if ((size_t)r < sizeof(struct in_addr)) |
730 | return -EIO; | |
4e9e7f18 | 731 | |
73ae2b7d TG |
732 | if (data) |
733 | memcpy(data, attr_data, sizeof(struct in_addr)); | |
4e9e7f18 SS |
734 | |
735 | return 0; | |
736 | } | |
737 | ||
1c4baffc | 738 | int sd_netlink_message_read_in6_addr(sd_netlink_message *m, unsigned short type, struct in6_addr *data) { |
4e9e7f18 SS |
739 | int r; |
740 | void *attr_data; | |
741 | ||
73ae2b7d TG |
742 | assert_return(m, -EINVAL); |
743 | ||
6c14ad61 | 744 | r = message_attribute_has_type(m, NULL, type, NETLINK_TYPE_IN_ADDR); |
d8e538ec TG |
745 | if (r < 0) |
746 | return r; | |
4e9e7f18 | 747 | |
4c641e99 | 748 | r = netlink_message_read_internal(m, type, &attr_data, NULL); |
3dd215e0 | 749 | if (r < 0) |
4e9e7f18 | 750 | return r; |
3dd215e0 TG |
751 | else if ((size_t)r < sizeof(struct in6_addr)) |
752 | return -EIO; | |
4e9e7f18 | 753 | |
73ae2b7d TG |
754 | if (data) |
755 | memcpy(data, attr_data, sizeof(struct in6_addr)); | |
4e9e7f18 SS |
756 | |
757 | return 0; | |
758 | } | |
759 | ||
f663aeb8 TG |
760 | static int netlink_container_parse(sd_netlink_message *m, |
761 | struct netlink_container *container, | |
762 | int count, | |
763 | struct rtattr *rta, | |
764 | unsigned int rt_len) { | |
765 | _cleanup_free_ struct netlink_attribute *attributes = NULL; | |
4203fc8b | 766 | |
f663aeb8 | 767 | attributes = new0(struct netlink_attribute, count); |
9ed794a3 | 768 | if (!attributes) |
4203fc8b TG |
769 | return -ENOMEM; |
770 | ||
4203fc8b | 771 | for (; RTA_OK(rta, rt_len); rta = RTA_NEXT(rta, rt_len)) { |
f663aeb8 TG |
772 | unsigned short type; |
773 | ||
4203fc8b TG |
774 | type = RTA_TYPE(rta); |
775 | ||
776 | /* if the kernel is newer than the headers we used | |
f663aeb8 | 777 | when building, we ignore out-of-range attributes */ |
4203fc8b TG |
778 | if (type >= count) |
779 | continue; | |
780 | ||
f1dd72c2 | 781 | if (attributes[type].offset != 0) |
4203fc8b TG |
782 | log_debug("rtnl: message parse - overwriting repeated attribute"); |
783 | ||
f663aeb8 | 784 | attributes[type].offset = (uint8_t *) rta - (uint8_t *) m->hdr; |
4c641e99 TG |
785 | attributes[type].nested = RTA_FLAGS(rta) & NLA_F_NESTED; |
786 | attributes[type].net_byteorder = RTA_FLAGS(rta) & NLA_F_NET_BYTEORDER; | |
4203fc8b TG |
787 | } |
788 | ||
ae2a15bc | 789 | container->attributes = TAKE_PTR(attributes); |
f663aeb8 | 790 | container->n_attributes = count; |
4203fc8b TG |
791 | |
792 | return 0; | |
793 | } | |
794 | ||
817d1cd8 | 795 | int sd_netlink_message_enter_container(sd_netlink_message *m, unsigned short type_id) { |
d8e538ec TG |
796 | const NLType *nl_type; |
797 | const NLTypeSystem *type_system; | |
3dd215e0 | 798 | void *container; |
817d1cd8 | 799 | uint16_t type; |
d8e538ec TG |
800 | size_t size; |
801 | int r; | |
3dd215e0 TG |
802 | |
803 | assert_return(m, -EINVAL); | |
804 | assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -EINVAL); | |
805 | ||
f663aeb8 | 806 | r = type_system_get_type(m->containers[m->n_containers].type_system, |
d8e538ec | 807 | &nl_type, |
817d1cd8 | 808 | type_id); |
3dd215e0 TG |
809 | if (r < 0) |
810 | return r; | |
3dd215e0 | 811 | |
817d1cd8 DH |
812 | type = type_get_type(nl_type); |
813 | ||
814 | if (type == NETLINK_TYPE_NESTED) { | |
f663aeb8 | 815 | r = type_system_get_type_system(m->containers[m->n_containers].type_system, |
d8e538ec | 816 | &type_system, |
817d1cd8 | 817 | type_id); |
d8e538ec TG |
818 | if (r < 0) |
819 | return r; | |
817d1cd8 | 820 | } else if (type == NETLINK_TYPE_UNION) { |
d8e538ec | 821 | const NLTypeSystemUnion *type_system_union; |
d8e538ec | 822 | |
f663aeb8 | 823 | r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, |
d8e538ec | 824 | &type_system_union, |
817d1cd8 | 825 | type_id); |
d8e538ec TG |
826 | if (r < 0) |
827 | return r; | |
828 | ||
4af7b60d TG |
829 | switch (type_system_union->match_type) { |
830 | case NL_MATCH_SIBLING: | |
831 | { | |
832 | const char *key; | |
833 | ||
1c4baffc | 834 | r = sd_netlink_message_read_string(m, type_system_union->match, &key); |
4af7b60d TG |
835 | if (r < 0) |
836 | return r; | |
837 | ||
838 | r = type_system_union_get_type_system(type_system_union, | |
839 | &type_system, | |
840 | key); | |
841 | if (r < 0) | |
842 | return r; | |
843 | ||
844 | break; | |
845 | } | |
846 | case NL_MATCH_PROTOCOL: | |
847 | { | |
848 | int family; | |
849 | ||
89489ef7 | 850 | r = sd_rtnl_message_get_family(m, &family); |
4af7b60d TG |
851 | if (r < 0) |
852 | return r; | |
853 | ||
854 | r = type_system_union_protocol_get_type_system(type_system_union, | |
855 | &type_system, | |
856 | family); | |
857 | if (r < 0) | |
858 | return r; | |
859 | ||
860 | break; | |
861 | } | |
862 | default: | |
1c4baffc | 863 | assert_not_reached("sd-netlink: invalid type system union type"); |
4af7b60d | 864 | } |
d8e538ec TG |
865 | } else |
866 | return -EINVAL; | |
867 | ||
4c641e99 | 868 | r = netlink_message_read_internal(m, type_id, &container, NULL); |
3dd215e0 TG |
869 | if (r < 0) |
870 | return r; | |
d8e538ec TG |
871 | else |
872 | size = (size_t)r; | |
3dd215e0 | 873 | |
313cefa1 | 874 | m->n_containers++; |
3dd215e0 | 875 | |
f663aeb8 TG |
876 | r = netlink_container_parse(m, |
877 | &m->containers[m->n_containers], | |
878 | type_system_get_count(type_system), | |
879 | container, | |
880 | size); | |
d8e538ec | 881 | if (r < 0) { |
313cefa1 | 882 | m->n_containers--; |
3dd215e0 | 883 | return r; |
d8e538ec | 884 | } |
3dd215e0 | 885 | |
f663aeb8 | 886 | m->containers[m->n_containers].type_system = type_system; |
3dd215e0 TG |
887 | |
888 | return 0; | |
889 | } | |
890 | ||
1c4baffc | 891 | int sd_netlink_message_exit_container(sd_netlink_message *m) { |
e5c4350b TG |
892 | assert_return(m, -EINVAL); |
893 | assert_return(m->sealed, -EINVAL); | |
894 | assert_return(m->n_containers > 0, -EINVAL); | |
895 | ||
a1e58e8e | 896 | m->containers[m->n_containers].attributes = mfree(m->containers[m->n_containers].attributes); |
f663aeb8 | 897 | m->containers[m->n_containers].type_system = NULL; |
3dd215e0 | 898 | |
313cefa1 | 899 | m->n_containers--; |
e5c4350b TG |
900 | |
901 | return 0; | |
902 | } | |
903 | ||
1c4baffc | 904 | uint32_t rtnl_message_get_serial(sd_netlink_message *m) { |
65f568bb | 905 | assert(m); |
9d0db178 | 906 | assert(m->hdr); |
65f568bb TG |
907 | |
908 | return m->hdr->nlmsg_seq; | |
909 | } | |
910 | ||
1c4baffc | 911 | int sd_netlink_message_is_error(sd_netlink_message *m) { |
45af44d4 TG |
912 | assert_return(m, 0); |
913 | assert_return(m->hdr, 0); | |
914 | ||
915 | return m->hdr->nlmsg_type == NLMSG_ERROR; | |
916 | } | |
917 | ||
1c4baffc | 918 | int sd_netlink_message_get_errno(sd_netlink_message *m) { |
65f568bb TG |
919 | struct nlmsgerr *err; |
920 | ||
e16bcf98 | 921 | assert_return(m, -EINVAL); |
9d0db178 | 922 | assert_return(m->hdr, -EINVAL); |
65f568bb | 923 | |
1c4baffc | 924 | if (!sd_netlink_message_is_error(m)) |
65f568bb TG |
925 | return 0; |
926 | ||
927 | err = NLMSG_DATA(m->hdr); | |
928 | ||
929 | return err->error; | |
930 | } | |
931 | ||
1c4baffc | 932 | int sd_netlink_message_rewind(sd_netlink_message *m) { |
817d1cd8 | 933 | const NLType *nl_type; |
05d0c2e3 | 934 | const NLTypeSystem *type_system_root; |
817d1cd8 DH |
935 | uint16_t type; |
936 | size_t size; | |
3dd215e0 TG |
937 | unsigned i; |
938 | int r; | |
0fc7531b TG |
939 | |
940 | assert_return(m, -EINVAL); | |
0fc7531b | 941 | |
3dd215e0 TG |
942 | /* don't allow appending to message once parsed */ |
943 | if (!m->sealed) | |
944 | rtnl_message_seal(m); | |
945 | ||
05d0c2e3 JT |
946 | type_system_root = type_system_get_root(m->protocol); |
947 | ||
1f6b4113 | 948 | for (i = 1; i <= m->n_containers; i++) |
a1e58e8e | 949 | m->containers[i].attributes = mfree(m->containers[i].attributes); |
3dd215e0 TG |
950 | |
951 | m->n_containers = 0; | |
952 | ||
ece174c5 | 953 | if (m->containers[0].attributes) |
3dd215e0 TG |
954 | /* top-level attributes have already been parsed */ |
955 | return 0; | |
3dd215e0 | 956 | |
d8e538ec TG |
957 | assert(m->hdr); |
958 | ||
05d0c2e3 | 959 | r = type_system_get_type(type_system_root, &nl_type, m->hdr->nlmsg_type); |
d8e538ec TG |
960 | if (r < 0) |
961 | return r; | |
962 | ||
817d1cd8 DH |
963 | type = type_get_type(nl_type); |
964 | size = type_get_size(nl_type); | |
965 | ||
966 | if (type == NETLINK_TYPE_NESTED) { | |
c658008f | 967 | const NLTypeSystem *type_system; |
d8e538ec | 968 | |
817d1cd8 | 969 | type_get_type_system(nl_type, &type_system); |
d8e538ec | 970 | |
f663aeb8 | 971 | m->containers[0].type_system = type_system; |
d8e538ec | 972 | |
f663aeb8 TG |
973 | r = netlink_container_parse(m, |
974 | &m->containers[m->n_containers], | |
975 | type_system_get_count(type_system), | |
976 | (struct rtattr*)((uint8_t*)NLMSG_DATA(m->hdr) + NLMSG_ALIGN(size)), | |
977 | NLMSG_PAYLOAD(m->hdr, size)); | |
d8e538ec TG |
978 | if (r < 0) |
979 | return r; | |
0fc7531b TG |
980 | } |
981 | ||
982 | return 0; | |
983 | } | |
3dd215e0 | 984 | |
1c4baffc | 985 | void rtnl_message_seal(sd_netlink_message *m) { |
3dd215e0 TG |
986 | assert(m); |
987 | assert(!m->sealed); | |
988 | ||
989 | m->sealed = true; | |
990 | } | |
1403f45a | 991 | |
1c4baffc | 992 | sd_netlink_message *sd_netlink_message_next(sd_netlink_message *m) { |
1403f45a TG |
993 | assert_return(m, NULL); |
994 | ||
995 | return m->next; | |
996 | } |