1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2014 Lennart Poettering
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.
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.
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/>.
24 #include "sd-network.h"
27 #include "resolved-link.h"
29 int link_new(Manager *m, Link **ret, int ifindex) {
30 _cleanup_(link_freep) Link *l = NULL;
36 r = hashmap_ensure_allocated(&m->links, NULL, NULL);
45 l->llmnr_support = SUPPORT_YES;
47 r = hashmap_put(m->links, INT_TO_PTR(ifindex), l);
60 Link *link_free(Link *l) {
66 link_address_free(l->addresses);
69 hashmap_remove(l->manager->links, INT_TO_PTR(l->ifindex));
71 dns_scope_free(l->unicast_scope);
72 dns_scope_free(l->llmnr_ipv4_scope);
73 dns_scope_free(l->llmnr_ipv6_scope);
75 while (l->dns_servers)
76 dns_server_free(l->dns_servers);
82 static void link_allocate_scopes(Link *l) {
88 if (!l->unicast_scope) {
89 r = dns_scope_new(l->manager, &l->unicast_scope, l, DNS_PROTOCOL_DNS, AF_UNSPEC);
91 log_warning("Failed to allocate DNS scope: %s", strerror(-r));
94 l->unicast_scope = dns_scope_free(l->unicast_scope);
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);
102 log_warning("Failed to allocate LLMNR IPv4 scope: %s", strerror(-r));
105 l->llmnr_ipv4_scope = dns_scope_free(l->llmnr_ipv4_scope);
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);
114 log_warning("Failed to allocate LLMNR IPv6 scope: %s", strerror(-r));
117 l->llmnr_ipv6_scope = dns_scope_free(l->llmnr_ipv6_scope);
120 void link_add_rrs(Link *l, bool force_remove) {
123 LIST_FOREACH(addresses, a, l->addresses)
124 link_address_add_rrs(a, force_remove);
127 int link_update_rtnl(Link *l, sd_rtnl_message *m) {
128 const char *n = NULL;
134 r = sd_rtnl_message_link_get_flags(m, &l->flags);
138 sd_rtnl_message_read_u32(m, IFLA_MTU, &l->mtu);
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);
145 link_allocate_scopes(l);
146 link_add_rrs(l, false);
151 static int link_update_dns_servers(Link *l) {
152 _cleanup_strv_free_ char **nameservers = NULL;
159 r = sd_network_link_get_dns(l->ifindex, &nameservers);
163 LIST_FOREACH(servers, s, l->dns_servers)
166 STRV_FOREACH(nameserver, nameservers) {
167 union in_addr_union a;
170 r = in_addr_from_string_auto(*nameserver, &family, &a);
174 s = link_find_dns_server(l, family, &a);
178 r = dns_server_new(l->manager, NULL, DNS_SERVER_LINK, l, family, &a);
184 LIST_FOREACH_SAFE(servers, s, nx, l->dns_servers)
191 while (l->dns_servers)
192 dns_server_free(l->dns_servers);
197 static int link_update_llmnr_support(Link *l) {
198 _cleanup_free_ char *b = NULL;
203 r = sd_network_link_get_llmnr(l->ifindex, &b);
207 r = parse_boolean(b);
209 if (streq(b, "resolve"))
210 l->llmnr_support = SUPPORT_RESOLVE;
215 l->llmnr_support = SUPPORT_YES;
217 l->llmnr_support = SUPPORT_NO;
222 l->llmnr_support = SUPPORT_YES;
226 int link_update_monitor(Link *l) {
229 link_update_dns_servers(l);
230 link_update_llmnr_support(l);
231 link_allocate_scopes(l);
232 link_add_rrs(l, false);
237 bool link_relevant(Link *l, int family) {
238 _cleanup_free_ char *state = NULL;
243 /* A link is relevant if it isn't a loopback or pointopoint
244 * device, has a link beat, can do multicast and has at least
245 * one relevant IP address */
247 if (l->flags & (IFF_LOOPBACK|IFF_POINTOPOINT|IFF_DORMANT))
250 if ((l->flags & (IFF_UP|IFF_LOWER_UP|IFF_MULTICAST)) != (IFF_UP|IFF_LOWER_UP|IFF_MULTICAST))
253 sd_network_link_get_operational_state(l->ifindex, &state);
254 if (state && !STR_IN_SET(state, "unknown", "degraded", "routable"))
257 LIST_FOREACH(addresses, a, l->addresses)
258 if (a->family == family && link_address_relevant(a))
264 LinkAddress *link_find_address(Link *l, int family, const union in_addr_union *in_addr) {
269 LIST_FOREACH(addresses, a, l->addresses)
270 if (a->family == family && in_addr_equal(family, &a->in_addr, in_addr))
276 DnsServer* link_find_dns_server(Link *l, int family, const union in_addr_union *in_addr) {
281 LIST_FOREACH(servers, s, l->dns_servers)
282 if (s->family == family && in_addr_equal(family, &s->address, in_addr))
287 DnsServer* link_set_dns_server(Link *l, DnsServer *s) {
290 if (l->current_dns_server == s)
294 _cleanup_free_ char *ip = NULL;
296 in_addr_to_string(s->family, &s->address, &ip);
297 log_info("Switching to DNS server %s for interface %s.", strna(ip), l->name);
300 l->current_dns_server = s;
302 if (l->unicast_scope)
303 dns_cache_flush(&l->unicast_scope->cache);
308 DnsServer *link_get_dns_server(Link *l) {
311 if (!l->current_dns_server)
312 link_set_dns_server(l, l->dns_servers);
314 return l->current_dns_server;
317 void link_next_dns_server(Link *l) {
320 if (!l->current_dns_server)
323 if (l->current_dns_server->servers_next) {
324 link_set_dns_server(l, l->current_dns_server->servers_next);
328 link_set_dns_server(l, l->dns_servers);
331 int link_address_new(Link *l, LinkAddress **ret, int family, const union in_addr_union *in_addr) {
337 a = new0(LinkAddress, 1);
342 a->in_addr = *in_addr;
345 LIST_PREPEND(addresses, l->addresses, a);
353 LinkAddress *link_address_free(LinkAddress *a) {
358 LIST_REMOVE(addresses, a->link->addresses, a);
360 if (a->llmnr_address_rr) {
361 if (a->family == AF_INET && a->link->llmnr_ipv4_scope)
362 dns_zone_remove_rr(&a->link->llmnr_ipv4_scope->zone, a->llmnr_address_rr);
363 else if (a->family == AF_INET6 && a->link->llmnr_ipv6_scope)
364 dns_zone_remove_rr(&a->link->llmnr_ipv6_scope->zone, a->llmnr_address_rr);
367 if (a->llmnr_ptr_rr) {
368 if (a->family == AF_INET && a->link->llmnr_ipv4_scope)
369 dns_zone_remove_rr(&a->link->llmnr_ipv4_scope->zone, a->llmnr_ptr_rr);
370 else if (a->family == AF_INET6 && a->link->llmnr_ipv6_scope)
371 dns_zone_remove_rr(&a->link->llmnr_ipv6_scope->zone, a->llmnr_ptr_rr);
375 dns_resource_record_unref(a->llmnr_address_rr);
376 dns_resource_record_unref(a->llmnr_ptr_rr);
382 void link_address_add_rrs(LinkAddress *a, bool force_remove) {
387 if (a->family == AF_INET) {
390 link_address_relevant(a) &&
391 a->link->llmnr_ipv4_scope &&
392 a->link->llmnr_support == SUPPORT_YES &&
393 a->link->manager->llmnr_support == SUPPORT_YES) {
395 if (!a->link->manager->host_ipv4_key) {
396 a->link->manager->host_ipv4_key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_A, a->link->manager->hostname);
397 if (!a->link->manager->host_ipv4_key) {
403 if (!a->llmnr_address_rr) {
404 a->llmnr_address_rr = dns_resource_record_new(a->link->manager->host_ipv4_key);
405 if (!a->llmnr_address_rr) {
410 a->llmnr_address_rr->a.in_addr = a->in_addr.in;
411 a->llmnr_address_rr->ttl = LLMNR_DEFAULT_TTL;
414 if (!a->llmnr_ptr_rr) {
415 r = dns_resource_record_new_reverse(&a->llmnr_ptr_rr, a->family, &a->in_addr, a->link->manager->hostname);
419 a->llmnr_ptr_rr->ttl = LLMNR_DEFAULT_TTL;
422 r = dns_zone_put(&a->link->llmnr_ipv4_scope->zone, a->link->llmnr_ipv4_scope, a->llmnr_address_rr, true);
424 log_warning("Failed to add A record to LLMNR zone: %s", strerror(-r));
426 r = dns_zone_put(&a->link->llmnr_ipv4_scope->zone, a->link->llmnr_ipv4_scope, a->llmnr_ptr_rr, false);
428 log_warning("Failed to add IPv6 PTR record to LLMNR zone: %s", strerror(-r));
430 if (a->llmnr_address_rr) {
431 if (a->link->llmnr_ipv4_scope)
432 dns_zone_remove_rr(&a->link->llmnr_ipv4_scope->zone, a->llmnr_address_rr);
433 a->llmnr_address_rr = dns_resource_record_unref(a->llmnr_address_rr);
436 if (a->llmnr_ptr_rr) {
437 if (a->link->llmnr_ipv4_scope)
438 dns_zone_remove_rr(&a->link->llmnr_ipv4_scope->zone, a->llmnr_ptr_rr);
439 a->llmnr_ptr_rr = dns_resource_record_unref(a->llmnr_ptr_rr);
444 if (a->family == AF_INET6) {
447 link_address_relevant(a) &&
448 a->link->llmnr_ipv6_scope &&
449 a->link->llmnr_support == SUPPORT_YES &&
450 a->link->manager->llmnr_support == SUPPORT_YES) {
452 if (!a->link->manager->host_ipv6_key) {
453 a->link->manager->host_ipv6_key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_AAAA, a->link->manager->hostname);
454 if (!a->link->manager->host_ipv6_key) {
460 if (!a->llmnr_address_rr) {
461 a->llmnr_address_rr = dns_resource_record_new(a->link->manager->host_ipv6_key);
462 if (!a->llmnr_address_rr) {
467 a->llmnr_address_rr->aaaa.in6_addr = a->in_addr.in6;
468 a->llmnr_address_rr->ttl = LLMNR_DEFAULT_TTL;
471 if (!a->llmnr_ptr_rr) {
472 r = dns_resource_record_new_reverse(&a->llmnr_ptr_rr, a->family, &a->in_addr, a->link->manager->hostname);
476 a->llmnr_ptr_rr->ttl = LLMNR_DEFAULT_TTL;
479 r = dns_zone_put(&a->link->llmnr_ipv6_scope->zone, a->link->llmnr_ipv6_scope, a->llmnr_address_rr, true);
481 log_warning("Failed to add AAAA record to LLMNR zone: %s", strerror(-r));
483 r = dns_zone_put(&a->link->llmnr_ipv6_scope->zone, a->link->llmnr_ipv6_scope, a->llmnr_ptr_rr, false);
485 log_warning("Failed to add IPv6 PTR record to LLMNR zone: %s", strerror(-r));
487 if (a->llmnr_address_rr) {
488 if (a->link->llmnr_ipv6_scope)
489 dns_zone_remove_rr(&a->link->llmnr_ipv6_scope->zone, a->llmnr_address_rr);
490 a->llmnr_address_rr = dns_resource_record_unref(a->llmnr_address_rr);
493 if (a->llmnr_ptr_rr) {
494 if (a->link->llmnr_ipv6_scope)
495 dns_zone_remove_rr(&a->link->llmnr_ipv6_scope->zone, a->llmnr_ptr_rr);
496 a->llmnr_ptr_rr = dns_resource_record_unref(a->llmnr_ptr_rr);
504 log_debug("Failed to update address RRs: %s", strerror(-r));
507 int link_address_update_rtnl(LinkAddress *a, sd_rtnl_message *m) {
512 r = sd_rtnl_message_addr_get_flags(m, &a->flags);
516 sd_rtnl_message_addr_get_scope(m, &a->scope);
518 link_allocate_scopes(a->link);
519 link_add_rrs(a->link, false);
524 bool link_address_relevant(LinkAddress *a) {
527 if (a->flags & (IFA_F_DEPRECATED|IFA_F_TENTATIVE))
530 if (IN_SET(a->scope, RT_SCOPE_HOST, RT_SCOPE_NOWHERE))