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74b2466e LP |
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" | |
74b2466e LP |
25 | #include "strv.h" |
26 | #include "resolved-link.h" | |
27 | ||
623a4c97 LP |
28 | static void link_address_add_rrs(LinkAddress *a); |
29 | ||
74b2466e LP |
30 | int link_new(Manager *m, Link **ret, int ifindex) { |
31 | _cleanup_(link_freep) Link *l = NULL; | |
32 | int r; | |
33 | ||
34 | assert(m); | |
35 | assert(ifindex > 0); | |
36 | ||
37 | r = hashmap_ensure_allocated(&m->links, NULL, NULL); | |
38 | if (r < 0) | |
39 | return r; | |
40 | ||
41 | l = new0(Link, 1); | |
42 | if (!l) | |
43 | return -ENOMEM; | |
44 | ||
45 | l->ifindex = ifindex; | |
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); | |
1716f6dc LP |
72 | dns_scope_free(l->llmnr_ipv4_scope); |
73 | dns_scope_free(l->llmnr_ipv6_scope); | |
74b2466e | 74 | |
6073b6f2 TG |
75 | while (l->dns_servers) |
76 | dns_server_free(l->dns_servers); | |
74b2466e LP |
77 | |
78 | free(l); | |
79 | return NULL; | |
1716f6dc LP |
80 | } |
81 | ||
82 | static void link_allocate_scopes(Link *l) { | |
83 | int r; | |
84 | ||
85 | assert(l); | |
86 | ||
6073b6f2 | 87 | if (l->dns_servers) { |
1716f6dc LP |
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) | |
91 | log_warning("Failed to allocate DNS scope: %s", strerror(-r)); | |
92 | } | |
93 | } else | |
94 | l->unicast_scope = dns_scope_free(l->unicast_scope); | |
95 | ||
8bea3d6f | 96 | if (link_relevant(l, AF_INET) && (l->flags & IFF_MULTICAST) && l->manager->use_llmnr) { |
1716f6dc LP |
97 | if (!l->llmnr_ipv4_scope) { |
98 | r = dns_scope_new(l->manager, &l->llmnr_ipv4_scope, l, DNS_PROTOCOL_LLMNR, AF_INET); | |
99 | if (r < 0) | |
100 | log_warning("Failed to allocate LLMNR IPv4 scope: %s", strerror(-r)); | |
101 | } | |
102 | } else | |
103 | l->llmnr_ipv4_scope = dns_scope_free(l->llmnr_ipv4_scope); | |
104 | ||
8bea3d6f | 105 | if (link_relevant(l, AF_INET6) && (l->flags & IFF_MULTICAST) && l->manager->use_llmnr) { |
1716f6dc LP |
106 | if (!l->llmnr_ipv6_scope) { |
107 | r = dns_scope_new(l->manager, &l->llmnr_ipv6_scope, l, DNS_PROTOCOL_LLMNR, AF_INET6); | |
108 | if (r < 0) | |
109 | log_warning("Failed to allocate LLMNR IPv6 scope: %s", strerror(-r)); | |
110 | } | |
111 | } else | |
112 | l->llmnr_ipv6_scope = dns_scope_free(l->llmnr_ipv6_scope); | |
113 | } | |
74b2466e | 114 | |
623a4c97 LP |
115 | static void link_add_rrs(Link *l) { |
116 | LinkAddress *a; | |
117 | ||
118 | LIST_FOREACH(addresses, a, l->addresses) | |
119 | link_address_add_rrs(a); | |
120 | } | |
121 | ||
74b2466e | 122 | int link_update_rtnl(Link *l, sd_rtnl_message *m) { |
1716f6dc | 123 | const char *n = NULL; |
74b2466e LP |
124 | int r; |
125 | ||
126 | assert(l); | |
127 | assert(m); | |
128 | ||
129 | r = sd_rtnl_message_link_get_flags(m, &l->flags); | |
130 | if (r < 0) | |
131 | return r; | |
132 | ||
c5ed9316 | 133 | sd_rtnl_message_read_u32(m, IFLA_MTU, &l->mtu); |
1716f6dc LP |
134 | |
135 | if (sd_rtnl_message_read_string(m, IFLA_IFNAME, &n) >= 0) { | |
136 | strncpy(l->name, n, sizeof(l->name)); | |
137 | char_array_0(l->name); | |
138 | } | |
139 | ||
140 | link_allocate_scopes(l); | |
623a4c97 LP |
141 | link_add_rrs(l); |
142 | ||
74b2466e LP |
143 | return 0; |
144 | } | |
145 | ||
6073b6f2 | 146 | static int link_update_dns_servers(Link *l) { |
6f4dedb2 TG |
147 | _cleanup_strv_free_ char **nameservers = NULL; |
148 | char **nameserver; | |
74b2466e | 149 | DnsServer *s, *nx; |
6f4dedb2 | 150 | int r; |
74b2466e LP |
151 | |
152 | assert(l); | |
153 | ||
6073b6f2 | 154 | LIST_FOREACH(servers, s, l->dns_servers) |
74b2466e LP |
155 | s->marked = true; |
156 | ||
6f4dedb2 TG |
157 | r = sd_network_get_dns(l->ifindex, &nameservers); |
158 | if (r < 0) | |
74b2466e | 159 | goto clear; |
74b2466e | 160 | |
6f4dedb2 TG |
161 | STRV_FOREACH(nameserver, nameservers) { |
162 | union in_addr_union a; | |
163 | int family; | |
74b2466e | 164 | |
6f4dedb2 TG |
165 | r = in_addr_from_string_auto(*nameserver, &family, &a); |
166 | if (r < 0) | |
167 | goto clear; | |
74b2466e | 168 | |
6f4dedb2 | 169 | s = link_find_dns_server(l, family, &a); |
74b2466e LP |
170 | if (s) |
171 | s->marked = false; | |
172 | else { | |
6f4dedb2 | 173 | r = dns_server_new(l->manager, NULL, l, family, &a); |
74b2466e LP |
174 | if (r < 0) |
175 | goto clear; | |
176 | } | |
177 | } | |
178 | ||
6073b6f2 | 179 | LIST_FOREACH_SAFE(servers, s, nx, l->dns_servers) |
74b2466e LP |
180 | if (s->marked) |
181 | dns_server_free(s); | |
182 | ||
183 | return 0; | |
184 | ||
185 | clear: | |
6073b6f2 TG |
186 | while (l->dns_servers) |
187 | dns_server_free(l->dns_servers); | |
74b2466e LP |
188 | |
189 | return r; | |
190 | } | |
191 | ||
192 | int link_update_monitor(Link *l) { | |
193 | assert(l); | |
194 | ||
6073b6f2 | 195 | link_update_dns_servers(l); |
1716f6dc | 196 | link_allocate_scopes(l); |
623a4c97 | 197 | link_add_rrs(l); |
74b2466e LP |
198 | |
199 | return 0; | |
200 | } | |
201 | ||
0dd25fb9 | 202 | bool link_relevant(Link *l, int family) { |
1716f6dc | 203 | _cleanup_free_ char *state = NULL; |
74b2466e LP |
204 | LinkAddress *a; |
205 | ||
206 | assert(l); | |
207 | ||
208 | /* A link is relevant if it isn't a loopback device and has at | |
209 | * least one relevant IP address */ | |
210 | ||
211 | if (l->flags & IFF_LOOPBACK) | |
212 | return false; | |
213 | ||
1716f6dc LP |
214 | sd_network_get_link_operational_state(l->ifindex, &state); |
215 | if (state && !STR_IN_SET(state, "unknown", "degraded", "routable")) | |
74b2466e LP |
216 | return false; |
217 | ||
218 | LIST_FOREACH(addresses, a, l->addresses) | |
1716f6dc | 219 | if (a->family == family && link_address_relevant(a)) |
74b2466e LP |
220 | return true; |
221 | ||
222 | return false; | |
223 | } | |
224 | ||
623a4c97 | 225 | LinkAddress *link_find_address(Link *l, int family, const union in_addr_union *in_addr) { |
74b2466e LP |
226 | LinkAddress *a; |
227 | ||
228 | assert(l); | |
229 | ||
1716f6dc LP |
230 | LIST_FOREACH(addresses, a, l->addresses) |
231 | if (a->family == family && in_addr_equal(family, &a->in_addr, in_addr)) | |
74b2466e | 232 | return a; |
74b2466e LP |
233 | |
234 | return NULL; | |
235 | } | |
236 | ||
623a4c97 | 237 | DnsServer* link_find_dns_server(Link *l, int family, const union in_addr_union *in_addr) { |
6073b6f2 | 238 | DnsServer *s; |
74b2466e LP |
239 | |
240 | assert(l); | |
241 | ||
6073b6f2 | 242 | LIST_FOREACH(servers, s, l->dns_servers) |
1716f6dc | 243 | if (s->family == family && in_addr_equal(family, &s->address, in_addr)) |
74b2466e | 244 | return s; |
74b2466e LP |
245 | return NULL; |
246 | } | |
247 | ||
248 | DnsServer *link_get_dns_server(Link *l) { | |
249 | assert(l); | |
250 | ||
251 | if (!l->current_dns_server) | |
6073b6f2 | 252 | l->current_dns_server = l->dns_servers; |
74b2466e LP |
253 | |
254 | return l->current_dns_server; | |
255 | } | |
256 | ||
257 | void link_next_dns_server(Link *l) { | |
258 | assert(l); | |
259 | ||
260 | /* Switch to the next DNS server */ | |
261 | ||
262 | if (!l->current_dns_server) { | |
6073b6f2 | 263 | l->current_dns_server = l->dns_servers; |
74b2466e LP |
264 | if (l->current_dns_server) |
265 | return; | |
266 | } | |
267 | ||
268 | if (!l->current_dns_server) | |
269 | return; | |
270 | ||
271 | if (l->current_dns_server->servers_next) { | |
272 | l->current_dns_server = l->current_dns_server->servers_next; | |
273 | return; | |
274 | } | |
275 | ||
6073b6f2 | 276 | l->current_dns_server = l->dns_servers; |
74b2466e LP |
277 | } |
278 | ||
623a4c97 | 279 | int link_address_new(Link *l, LinkAddress **ret, int family, const union in_addr_union *in_addr) { |
74b2466e LP |
280 | LinkAddress *a; |
281 | ||
282 | assert(l); | |
283 | assert(in_addr); | |
284 | ||
285 | a = new0(LinkAddress, 1); | |
286 | if (!a) | |
287 | return -ENOMEM; | |
288 | ||
289 | a->family = family; | |
290 | a->in_addr = *in_addr; | |
291 | ||
292 | a->link = l; | |
293 | LIST_PREPEND(addresses, l->addresses, a); | |
294 | ||
295 | if (ret) | |
296 | *ret = a; | |
297 | ||
298 | return 0; | |
299 | } | |
300 | ||
301 | LinkAddress *link_address_free(LinkAddress *a) { | |
302 | if (!a) | |
303 | return NULL; | |
304 | ||
623a4c97 | 305 | if (a->link) { |
74b2466e LP |
306 | LIST_REMOVE(addresses, a->link->addresses, a); |
307 | ||
623a4c97 LP |
308 | if (a->llmnr_address_rr) { |
309 | ||
310 | if (a->family == AF_INET && a->link->llmnr_ipv4_scope) | |
311 | dns_zone_remove_rr(&a->link->llmnr_ipv4_scope->zone, a->llmnr_address_rr); | |
312 | else if (a->family == AF_INET6 && a->link->llmnr_ipv6_scope) | |
313 | dns_zone_remove_rr(&a->link->llmnr_ipv6_scope->zone, a->llmnr_address_rr); | |
314 | ||
315 | dns_resource_record_unref(a->llmnr_address_rr); | |
316 | } | |
317 | ||
318 | if (a->llmnr_ptr_rr) { | |
319 | if (a->family == AF_INET && a->link->llmnr_ipv4_scope) | |
320 | dns_zone_remove_rr(&a->link->llmnr_ipv4_scope->zone, a->llmnr_ptr_rr); | |
321 | else if (a->family == AF_INET6 && a->link->llmnr_ipv6_scope) | |
322 | dns_zone_remove_rr(&a->link->llmnr_ipv6_scope->zone, a->llmnr_ptr_rr); | |
323 | ||
324 | dns_resource_record_unref(a->llmnr_ptr_rr); | |
325 | } | |
326 | } | |
327 | ||
74b2466e LP |
328 | free(a); |
329 | return NULL; | |
330 | } | |
331 | ||
623a4c97 LP |
332 | static void link_address_add_rrs(LinkAddress *a) { |
333 | int r; | |
334 | ||
335 | assert(a); | |
336 | ||
337 | if (a->family == AF_INET && a->link->llmnr_ipv4_scope) { | |
338 | ||
339 | if (!a->link->manager->host_ipv4_key) { | |
340 | a->link->manager->host_ipv4_key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_A, a->link->manager->hostname); | |
341 | if (!a->link->manager->host_ipv4_key) { | |
342 | r = -ENOMEM; | |
343 | goto fail; | |
344 | } | |
345 | } | |
346 | ||
347 | if (!a->llmnr_address_rr) { | |
348 | a->llmnr_address_rr = dns_resource_record_new(a->link->manager->host_ipv4_key); | |
349 | if (!a->llmnr_address_rr) { | |
350 | r = -ENOMEM; | |
351 | goto fail; | |
352 | } | |
353 | ||
354 | a->llmnr_address_rr->a.in_addr = a->in_addr.in; | |
0c903ae7 | 355 | a->llmnr_address_rr->ttl = LLMNR_DEFAULT_TTL; |
623a4c97 LP |
356 | } |
357 | ||
358 | if (!a->llmnr_ptr_rr) { | |
359 | r = dns_resource_record_new_reverse(&a->llmnr_ptr_rr, a->family, &a->in_addr, a->link->manager->hostname); | |
360 | if (r < 0) | |
361 | goto fail; | |
362 | ||
0c903ae7 | 363 | a->llmnr_ptr_rr->ttl = LLMNR_DEFAULT_TTL; |
623a4c97 LP |
364 | } |
365 | ||
366 | if (link_address_relevant(a)) { | |
367 | r = dns_zone_put(&a->link->llmnr_ipv4_scope->zone, a->llmnr_address_rr); | |
368 | if (r < 0) | |
369 | goto fail; | |
370 | ||
371 | r = dns_zone_put(&a->link->llmnr_ipv4_scope->zone, a->llmnr_ptr_rr); | |
372 | if (r < 0) | |
373 | goto fail; | |
374 | } else { | |
375 | dns_zone_remove_rr(&a->link->llmnr_ipv4_scope->zone, a->llmnr_address_rr); | |
376 | dns_zone_remove_rr(&a->link->llmnr_ipv4_scope->zone, a->llmnr_ptr_rr); | |
377 | } | |
378 | } | |
379 | ||
380 | if (a->family == AF_INET6 && a->link->llmnr_ipv6_scope) { | |
381 | ||
382 | if (!a->link->manager->host_ipv6_key) { | |
383 | a->link->manager->host_ipv6_key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_AAAA, a->link->manager->hostname); | |
384 | if (!a->link->manager->host_ipv6_key) { | |
385 | r = -ENOMEM; | |
386 | goto fail; | |
387 | } | |
388 | } | |
389 | ||
390 | if (!a->llmnr_address_rr) { | |
391 | a->llmnr_address_rr = dns_resource_record_new(a->link->manager->host_ipv6_key); | |
392 | if (!a->llmnr_address_rr) { | |
393 | r = -ENOMEM; | |
394 | goto fail; | |
395 | } | |
396 | ||
397 | a->llmnr_address_rr->aaaa.in6_addr = a->in_addr.in6; | |
0c903ae7 | 398 | a->llmnr_address_rr->ttl = LLMNR_DEFAULT_TTL; |
623a4c97 LP |
399 | } |
400 | ||
401 | if (!a->llmnr_ptr_rr) { | |
402 | r = dns_resource_record_new_reverse(&a->llmnr_ptr_rr, a->family, &a->in_addr, a->link->manager->hostname); | |
403 | if (r < 0) | |
404 | goto fail; | |
405 | ||
0c903ae7 | 406 | a->llmnr_ptr_rr->ttl = LLMNR_DEFAULT_TTL; |
623a4c97 LP |
407 | } |
408 | ||
409 | if (link_address_relevant(a)) { | |
410 | r = dns_zone_put(&a->link->llmnr_ipv6_scope->zone, a->llmnr_address_rr); | |
411 | if (r < 0) | |
412 | goto fail; | |
413 | ||
414 | r = dns_zone_put(&a->link->llmnr_ipv6_scope->zone, a->llmnr_ptr_rr); | |
415 | if (r < 0) | |
416 | goto fail; | |
417 | } else { | |
418 | dns_zone_remove_rr(&a->link->llmnr_ipv6_scope->zone, a->llmnr_address_rr); | |
419 | dns_zone_remove_rr(&a->link->llmnr_ipv6_scope->zone, a->llmnr_ptr_rr); | |
420 | } | |
421 | } | |
422 | ||
423 | return; | |
424 | ||
425 | fail: | |
426 | log_debug("Failed to update address RRs: %s", strerror(-r)); | |
427 | } | |
428 | ||
74b2466e LP |
429 | int link_address_update_rtnl(LinkAddress *a, sd_rtnl_message *m) { |
430 | int r; | |
431 | assert(a); | |
432 | assert(m); | |
433 | ||
434 | r = sd_rtnl_message_addr_get_flags(m, &a->flags); | |
435 | if (r < 0) | |
436 | return r; | |
437 | ||
1716f6dc | 438 | sd_rtnl_message_addr_get_scope(m, &a->scope); |
74b2466e | 439 | |
1716f6dc | 440 | link_allocate_scopes(a->link); |
623a4c97 LP |
441 | link_add_rrs(a->link); |
442 | ||
74b2466e LP |
443 | return 0; |
444 | } | |
445 | ||
446 | bool link_address_relevant(LinkAddress *a) { | |
447 | assert(a); | |
448 | ||
449 | if (a->flags & IFA_F_DEPRECATED) | |
450 | return false; | |
451 | ||
452 | if (IN_SET(a->scope, RT_SCOPE_HOST, RT_SCOPE_NOWHERE)) | |
453 | return false; | |
454 | ||
455 | return true; | |
456 | } |