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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2014 Lennart Poettering | |
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 <net/if.h> | |
23 | ||
24 | #include "sd-network.h" | |
25 | #include "strv.h" | |
26 | #include "missing.h" | |
27 | #include "resolved-link.h" | |
28 | ||
29 | int link_new(Manager *m, Link **ret, int ifindex) { | |
30 | _cleanup_(link_freep) Link *l = NULL; | |
31 | int r; | |
32 | ||
33 | assert(m); | |
34 | assert(ifindex > 0); | |
35 | ||
36 | r = hashmap_ensure_allocated(&m->links, NULL); | |
37 | if (r < 0) | |
38 | return r; | |
39 | ||
40 | l = new0(Link, 1); | |
41 | if (!l) | |
42 | return -ENOMEM; | |
43 | ||
44 | l->ifindex = ifindex; | |
45 | l->llmnr_support = SUPPORT_YES; | |
46 | ||
47 | r = hashmap_put(m->links, INT_TO_PTR(ifindex), l); | |
48 | if (r < 0) | |
49 | return r; | |
50 | ||
51 | l->manager = m; | |
52 | ||
53 | if (ret) | |
54 | *ret = l; | |
55 | l = NULL; | |
56 | ||
57 | return 0; | |
58 | } | |
59 | ||
60 | Link *link_free(Link *l) { | |
61 | ||
62 | if (!l) | |
63 | return NULL; | |
64 | ||
65 | while (l->addresses) | |
66 | link_address_free(l->addresses); | |
67 | ||
68 | if (l->manager) | |
69 | hashmap_remove(l->manager->links, INT_TO_PTR(l->ifindex)); | |
70 | ||
71 | dns_scope_free(l->unicast_scope); | |
72 | dns_scope_free(l->llmnr_ipv4_scope); | |
73 | dns_scope_free(l->llmnr_ipv6_scope); | |
74 | ||
75 | while (l->dns_servers) | |
76 | dns_server_free(l->dns_servers); | |
77 | ||
78 | free(l); | |
79 | return NULL; | |
80 | } | |
81 | ||
82 | static void link_allocate_scopes(Link *l) { | |
83 | int r; | |
84 | ||
85 | assert(l); | |
86 | ||
87 | if (l->dns_servers) { | |
88 | if (!l->unicast_scope) { | |
89 | r = dns_scope_new(l->manager, &l->unicast_scope, l, DNS_PROTOCOL_DNS, AF_UNSPEC); | |
90 | if (r < 0) | |
f47781d8 | 91 | log_warning_errno(r, "Failed to allocate DNS scope: %m"); |
5eef597e MP |
92 | } |
93 | } else | |
94 | l->unicast_scope = dns_scope_free(l->unicast_scope); | |
95 | ||
96 | if (link_relevant(l, AF_INET) && | |
97 | l->llmnr_support != SUPPORT_NO && | |
98 | l->manager->llmnr_support != SUPPORT_NO) { | |
99 | if (!l->llmnr_ipv4_scope) { | |
100 | r = dns_scope_new(l->manager, &l->llmnr_ipv4_scope, l, DNS_PROTOCOL_LLMNR, AF_INET); | |
101 | if (r < 0) | |
f47781d8 | 102 | log_warning_errno(r, "Failed to allocate LLMNR IPv4 scope: %m"); |
5eef597e MP |
103 | } |
104 | } else | |
105 | l->llmnr_ipv4_scope = dns_scope_free(l->llmnr_ipv4_scope); | |
106 | ||
107 | if (link_relevant(l, AF_INET6) && | |
108 | l->llmnr_support != SUPPORT_NO && | |
109 | l->manager->llmnr_support != SUPPORT_NO && | |
110 | socket_ipv6_is_supported()) { | |
111 | if (!l->llmnr_ipv6_scope) { | |
112 | r = dns_scope_new(l->manager, &l->llmnr_ipv6_scope, l, DNS_PROTOCOL_LLMNR, AF_INET6); | |
113 | if (r < 0) | |
f47781d8 | 114 | log_warning_errno(r, "Failed to allocate LLMNR IPv6 scope: %m"); |
5eef597e MP |
115 | } |
116 | } else | |
117 | l->llmnr_ipv6_scope = dns_scope_free(l->llmnr_ipv6_scope); | |
118 | } | |
119 | ||
120 | void link_add_rrs(Link *l, bool force_remove) { | |
121 | LinkAddress *a; | |
122 | ||
123 | LIST_FOREACH(addresses, a, l->addresses) | |
124 | link_address_add_rrs(a, force_remove); | |
125 | } | |
126 | ||
127 | int link_update_rtnl(Link *l, sd_rtnl_message *m) { | |
128 | const char *n = NULL; | |
129 | int r; | |
130 | ||
131 | assert(l); | |
132 | assert(m); | |
133 | ||
134 | r = sd_rtnl_message_link_get_flags(m, &l->flags); | |
135 | if (r < 0) | |
136 | return r; | |
137 | ||
138 | sd_rtnl_message_read_u32(m, IFLA_MTU, &l->mtu); | |
139 | ||
140 | if (sd_rtnl_message_read_string(m, IFLA_IFNAME, &n) >= 0) { | |
141 | strncpy(l->name, n, sizeof(l->name)-1); | |
142 | char_array_0(l->name); | |
143 | } | |
144 | ||
145 | link_allocate_scopes(l); | |
146 | link_add_rrs(l, false); | |
147 | ||
148 | return 0; | |
149 | } | |
150 | ||
151 | static int link_update_dns_servers(Link *l) { | |
152 | _cleanup_strv_free_ char **nameservers = NULL; | |
153 | char **nameserver; | |
154 | DnsServer *s, *nx; | |
155 | int r; | |
156 | ||
157 | assert(l); | |
158 | ||
159 | r = sd_network_link_get_dns(l->ifindex, &nameservers); | |
160 | if (r < 0) | |
161 | goto clear; | |
162 | ||
163 | LIST_FOREACH(servers, s, l->dns_servers) | |
164 | s->marked = true; | |
165 | ||
166 | STRV_FOREACH(nameserver, nameservers) { | |
167 | union in_addr_union a; | |
168 | int family; | |
169 | ||
170 | r = in_addr_from_string_auto(*nameserver, &family, &a); | |
171 | if (r < 0) | |
172 | goto clear; | |
173 | ||
174 | s = link_find_dns_server(l, family, &a); | |
175 | if (s) | |
176 | s->marked = false; | |
177 | else { | |
178 | r = dns_server_new(l->manager, NULL, DNS_SERVER_LINK, l, family, &a); | |
179 | if (r < 0) | |
180 | goto clear; | |
181 | } | |
182 | } | |
183 | ||
184 | LIST_FOREACH_SAFE(servers, s, nx, l->dns_servers) | |
185 | if (s->marked) | |
186 | dns_server_free(s); | |
187 | ||
188 | return 0; | |
189 | ||
190 | clear: | |
191 | while (l->dns_servers) | |
192 | dns_server_free(l->dns_servers); | |
193 | ||
194 | return r; | |
195 | } | |
196 | ||
197 | static int link_update_llmnr_support(Link *l) { | |
198 | _cleanup_free_ char *b = NULL; | |
199 | int r; | |
200 | ||
201 | assert(l); | |
202 | ||
203 | r = sd_network_link_get_llmnr(l->ifindex, &b); | |
204 | if (r < 0) | |
205 | goto clear; | |
206 | ||
207 | r = parse_boolean(b); | |
208 | if (r < 0) { | |
209 | if (streq(b, "resolve")) | |
210 | l->llmnr_support = SUPPORT_RESOLVE; | |
211 | else | |
212 | goto clear; | |
213 | ||
214 | } else if (r > 0) | |
215 | l->llmnr_support = SUPPORT_YES; | |
216 | else | |
217 | l->llmnr_support = SUPPORT_NO; | |
218 | ||
219 | return 0; | |
220 | ||
221 | clear: | |
222 | l->llmnr_support = SUPPORT_YES; | |
223 | return r; | |
224 | } | |
225 | ||
226 | static int link_update_domains(Link *l) { | |
227 | int r; | |
228 | ||
229 | if (!l->unicast_scope) | |
230 | return 0; | |
231 | ||
232 | strv_free(l->unicast_scope->domains); | |
233 | l->unicast_scope->domains = NULL; | |
234 | ||
235 | r = sd_network_link_get_domains(l->ifindex, | |
236 | &l->unicast_scope->domains); | |
237 | if (r < 0) | |
238 | return r; | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
243 | int link_update_monitor(Link *l) { | |
244 | assert(l); | |
245 | ||
246 | link_update_dns_servers(l); | |
247 | link_update_llmnr_support(l); | |
248 | link_allocate_scopes(l); | |
249 | link_update_domains(l); | |
250 | link_add_rrs(l, false); | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
255 | bool link_relevant(Link *l, int family) { | |
256 | _cleanup_free_ char *state = NULL; | |
257 | LinkAddress *a; | |
258 | ||
259 | assert(l); | |
260 | ||
261 | /* A link is relevant if it isn't a loopback or pointopoint | |
262 | * device, has a link beat, can do multicast and has at least | |
263 | * one relevant IP address */ | |
264 | ||
265 | if (l->flags & (IFF_LOOPBACK|IFF_POINTOPOINT|IFF_DORMANT)) | |
266 | return false; | |
267 | ||
268 | if ((l->flags & (IFF_UP|IFF_LOWER_UP|IFF_MULTICAST)) != (IFF_UP|IFF_LOWER_UP|IFF_MULTICAST)) | |
269 | return false; | |
270 | ||
271 | sd_network_link_get_operational_state(l->ifindex, &state); | |
272 | if (state && !STR_IN_SET(state, "unknown", "degraded", "routable")) | |
273 | return false; | |
274 | ||
275 | LIST_FOREACH(addresses, a, l->addresses) | |
276 | if (a->family == family && link_address_relevant(a)) | |
277 | return true; | |
278 | ||
279 | return false; | |
280 | } | |
281 | ||
282 | LinkAddress *link_find_address(Link *l, int family, const union in_addr_union *in_addr) { | |
283 | LinkAddress *a; | |
284 | ||
285 | assert(l); | |
286 | ||
287 | LIST_FOREACH(addresses, a, l->addresses) | |
288 | if (a->family == family && in_addr_equal(family, &a->in_addr, in_addr)) | |
289 | return a; | |
290 | ||
291 | return NULL; | |
292 | } | |
293 | ||
294 | DnsServer* link_find_dns_server(Link *l, int family, const union in_addr_union *in_addr) { | |
295 | DnsServer *s; | |
296 | ||
297 | assert(l); | |
298 | ||
299 | LIST_FOREACH(servers, s, l->dns_servers) | |
300 | if (s->family == family && in_addr_equal(family, &s->address, in_addr)) | |
301 | return s; | |
302 | return NULL; | |
303 | } | |
304 | ||
305 | DnsServer* link_set_dns_server(Link *l, DnsServer *s) { | |
306 | assert(l); | |
307 | ||
308 | if (l->current_dns_server == s) | |
309 | return s; | |
310 | ||
311 | if (s) { | |
312 | _cleanup_free_ char *ip = NULL; | |
313 | ||
314 | in_addr_to_string(s->family, &s->address, &ip); | |
315 | log_info("Switching to DNS server %s for interface %s.", strna(ip), l->name); | |
316 | } | |
317 | ||
318 | l->current_dns_server = s; | |
319 | ||
320 | if (l->unicast_scope) | |
321 | dns_cache_flush(&l->unicast_scope->cache); | |
322 | ||
323 | return s; | |
324 | } | |
325 | ||
326 | DnsServer *link_get_dns_server(Link *l) { | |
327 | assert(l); | |
328 | ||
329 | if (!l->current_dns_server) | |
330 | link_set_dns_server(l, l->dns_servers); | |
331 | ||
332 | return l->current_dns_server; | |
333 | } | |
334 | ||
335 | void link_next_dns_server(Link *l) { | |
336 | assert(l); | |
337 | ||
338 | if (!l->current_dns_server) | |
339 | return; | |
340 | ||
341 | if (l->current_dns_server->servers_next) { | |
342 | link_set_dns_server(l, l->current_dns_server->servers_next); | |
343 | return; | |
344 | } | |
345 | ||
346 | link_set_dns_server(l, l->dns_servers); | |
347 | } | |
348 | ||
349 | int link_address_new(Link *l, LinkAddress **ret, int family, const union in_addr_union *in_addr) { | |
350 | LinkAddress *a; | |
351 | ||
352 | assert(l); | |
353 | assert(in_addr); | |
354 | ||
355 | a = new0(LinkAddress, 1); | |
356 | if (!a) | |
357 | return -ENOMEM; | |
358 | ||
359 | a->family = family; | |
360 | a->in_addr = *in_addr; | |
361 | ||
362 | a->link = l; | |
363 | LIST_PREPEND(addresses, l->addresses, a); | |
364 | ||
365 | if (ret) | |
366 | *ret = a; | |
367 | ||
368 | return 0; | |
369 | } | |
370 | ||
371 | LinkAddress *link_address_free(LinkAddress *a) { | |
372 | if (!a) | |
373 | return NULL; | |
374 | ||
375 | if (a->link) { | |
376 | LIST_REMOVE(addresses, a->link->addresses, a); | |
377 | ||
378 | if (a->llmnr_address_rr) { | |
379 | if (a->family == AF_INET && a->link->llmnr_ipv4_scope) | |
380 | dns_zone_remove_rr(&a->link->llmnr_ipv4_scope->zone, a->llmnr_address_rr); | |
381 | else if (a->family == AF_INET6 && a->link->llmnr_ipv6_scope) | |
382 | dns_zone_remove_rr(&a->link->llmnr_ipv6_scope->zone, a->llmnr_address_rr); | |
383 | } | |
384 | ||
385 | if (a->llmnr_ptr_rr) { | |
386 | if (a->family == AF_INET && a->link->llmnr_ipv4_scope) | |
387 | dns_zone_remove_rr(&a->link->llmnr_ipv4_scope->zone, a->llmnr_ptr_rr); | |
388 | else if (a->family == AF_INET6 && a->link->llmnr_ipv6_scope) | |
389 | dns_zone_remove_rr(&a->link->llmnr_ipv6_scope->zone, a->llmnr_ptr_rr); | |
390 | } | |
391 | } | |
392 | ||
393 | dns_resource_record_unref(a->llmnr_address_rr); | |
394 | dns_resource_record_unref(a->llmnr_ptr_rr); | |
395 | ||
396 | free(a); | |
397 | return NULL; | |
398 | } | |
399 | ||
400 | void link_address_add_rrs(LinkAddress *a, bool force_remove) { | |
401 | int r; | |
402 | ||
403 | assert(a); | |
404 | ||
405 | if (a->family == AF_INET) { | |
406 | ||
407 | if (!force_remove && | |
408 | link_address_relevant(a) && | |
409 | a->link->llmnr_ipv4_scope && | |
410 | a->link->llmnr_support == SUPPORT_YES && | |
411 | a->link->manager->llmnr_support == SUPPORT_YES) { | |
412 | ||
413 | if (!a->link->manager->host_ipv4_key) { | |
414 | a->link->manager->host_ipv4_key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_A, a->link->manager->hostname); | |
415 | if (!a->link->manager->host_ipv4_key) { | |
416 | r = -ENOMEM; | |
417 | goto fail; | |
418 | } | |
419 | } | |
420 | ||
421 | if (!a->llmnr_address_rr) { | |
422 | a->llmnr_address_rr = dns_resource_record_new(a->link->manager->host_ipv4_key); | |
423 | if (!a->llmnr_address_rr) { | |
424 | r = -ENOMEM; | |
425 | goto fail; | |
426 | } | |
427 | ||
428 | a->llmnr_address_rr->a.in_addr = a->in_addr.in; | |
429 | a->llmnr_address_rr->ttl = LLMNR_DEFAULT_TTL; | |
430 | } | |
431 | ||
432 | if (!a->llmnr_ptr_rr) { | |
433 | r = dns_resource_record_new_reverse(&a->llmnr_ptr_rr, a->family, &a->in_addr, a->link->manager->hostname); | |
434 | if (r < 0) | |
435 | goto fail; | |
436 | ||
437 | a->llmnr_ptr_rr->ttl = LLMNR_DEFAULT_TTL; | |
438 | } | |
439 | ||
440 | r = dns_zone_put(&a->link->llmnr_ipv4_scope->zone, a->link->llmnr_ipv4_scope, a->llmnr_address_rr, true); | |
441 | if (r < 0) | |
f47781d8 | 442 | log_warning_errno(r, "Failed to add A record to LLMNR zone: %m"); |
5eef597e MP |
443 | |
444 | r = dns_zone_put(&a->link->llmnr_ipv4_scope->zone, a->link->llmnr_ipv4_scope, a->llmnr_ptr_rr, false); | |
445 | if (r < 0) | |
f47781d8 | 446 | log_warning_errno(r, "Failed to add IPv6 PTR record to LLMNR zone: %m"); |
5eef597e MP |
447 | } else { |
448 | if (a->llmnr_address_rr) { | |
449 | if (a->link->llmnr_ipv4_scope) | |
450 | dns_zone_remove_rr(&a->link->llmnr_ipv4_scope->zone, a->llmnr_address_rr); | |
451 | a->llmnr_address_rr = dns_resource_record_unref(a->llmnr_address_rr); | |
452 | } | |
453 | ||
454 | if (a->llmnr_ptr_rr) { | |
455 | if (a->link->llmnr_ipv4_scope) | |
456 | dns_zone_remove_rr(&a->link->llmnr_ipv4_scope->zone, a->llmnr_ptr_rr); | |
457 | a->llmnr_ptr_rr = dns_resource_record_unref(a->llmnr_ptr_rr); | |
458 | } | |
459 | } | |
460 | } | |
461 | ||
462 | if (a->family == AF_INET6) { | |
463 | ||
464 | if (!force_remove && | |
465 | link_address_relevant(a) && | |
466 | a->link->llmnr_ipv6_scope && | |
467 | a->link->llmnr_support == SUPPORT_YES && | |
468 | a->link->manager->llmnr_support == SUPPORT_YES) { | |
469 | ||
470 | if (!a->link->manager->host_ipv6_key) { | |
471 | a->link->manager->host_ipv6_key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_AAAA, a->link->manager->hostname); | |
472 | if (!a->link->manager->host_ipv6_key) { | |
473 | r = -ENOMEM; | |
474 | goto fail; | |
475 | } | |
476 | } | |
477 | ||
478 | if (!a->llmnr_address_rr) { | |
479 | a->llmnr_address_rr = dns_resource_record_new(a->link->manager->host_ipv6_key); | |
480 | if (!a->llmnr_address_rr) { | |
481 | r = -ENOMEM; | |
482 | goto fail; | |
483 | } | |
484 | ||
485 | a->llmnr_address_rr->aaaa.in6_addr = a->in_addr.in6; | |
486 | a->llmnr_address_rr->ttl = LLMNR_DEFAULT_TTL; | |
487 | } | |
488 | ||
489 | if (!a->llmnr_ptr_rr) { | |
490 | r = dns_resource_record_new_reverse(&a->llmnr_ptr_rr, a->family, &a->in_addr, a->link->manager->hostname); | |
491 | if (r < 0) | |
492 | goto fail; | |
493 | ||
494 | a->llmnr_ptr_rr->ttl = LLMNR_DEFAULT_TTL; | |
495 | } | |
496 | ||
497 | r = dns_zone_put(&a->link->llmnr_ipv6_scope->zone, a->link->llmnr_ipv6_scope, a->llmnr_address_rr, true); | |
498 | if (r < 0) | |
f47781d8 | 499 | log_warning_errno(r, "Failed to add AAAA record to LLMNR zone: %m"); |
5eef597e MP |
500 | |
501 | r = dns_zone_put(&a->link->llmnr_ipv6_scope->zone, a->link->llmnr_ipv6_scope, a->llmnr_ptr_rr, false); | |
502 | if (r < 0) | |
f47781d8 | 503 | log_warning_errno(r, "Failed to add IPv6 PTR record to LLMNR zone: %m"); |
5eef597e MP |
504 | } else { |
505 | if (a->llmnr_address_rr) { | |
506 | if (a->link->llmnr_ipv6_scope) | |
507 | dns_zone_remove_rr(&a->link->llmnr_ipv6_scope->zone, a->llmnr_address_rr); | |
508 | a->llmnr_address_rr = dns_resource_record_unref(a->llmnr_address_rr); | |
509 | } | |
510 | ||
511 | if (a->llmnr_ptr_rr) { | |
512 | if (a->link->llmnr_ipv6_scope) | |
513 | dns_zone_remove_rr(&a->link->llmnr_ipv6_scope->zone, a->llmnr_ptr_rr); | |
514 | a->llmnr_ptr_rr = dns_resource_record_unref(a->llmnr_ptr_rr); | |
515 | } | |
516 | } | |
517 | } | |
518 | ||
519 | return; | |
520 | ||
521 | fail: | |
f47781d8 | 522 | log_debug_errno(r, "Failed to update address RRs: %m"); |
5eef597e MP |
523 | } |
524 | ||
525 | int link_address_update_rtnl(LinkAddress *a, sd_rtnl_message *m) { | |
526 | int r; | |
527 | assert(a); | |
528 | assert(m); | |
529 | ||
530 | r = sd_rtnl_message_addr_get_flags(m, &a->flags); | |
531 | if (r < 0) | |
532 | return r; | |
533 | ||
534 | sd_rtnl_message_addr_get_scope(m, &a->scope); | |
535 | ||
536 | link_allocate_scopes(a->link); | |
537 | link_add_rrs(a->link, false); | |
538 | ||
539 | return 0; | |
540 | } | |
541 | ||
542 | bool link_address_relevant(LinkAddress *a) { | |
543 | assert(a); | |
544 | ||
545 | if (a->flags & (IFA_F_DEPRECATED|IFA_F_TENTATIVE)) | |
546 | return false; | |
547 | ||
548 | if (IN_SET(a->scope, RT_SCOPE_HOST, RT_SCOPE_NOWHERE)) | |
549 | return false; | |
550 | ||
551 | return true; | |
552 | } |