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[thirdparty/systemd.git] / src / network / networkd-link.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <netinet/ether.h>
4 #include <linux/if.h>
5 #include <linux/can/netlink.h>
6 #include <unistd.h>
7 #include <stdio_ext.h>
8
9 #include "alloc-util.h"
10 #include "bus-util.h"
11 #include "dhcp-lease-internal.h"
12 #include "fd-util.h"
13 #include "fileio.h"
14 #include "netlink-util.h"
15 #include "network-internal.h"
16 #include "networkd-ipv6-proxy-ndp.h"
17 #include "networkd-lldp-tx.h"
18 #include "networkd-manager.h"
19 #include "networkd-ndisc.h"
20 #include "networkd-radv.h"
21 #include "networkd-routing-policy-rule.h"
22 #include "set.h"
23 #include "socket-util.h"
24 #include "stdio-util.h"
25 #include "string-table.h"
26 #include "udev-util.h"
27 #include "util.h"
28 #include "virt.h"
29
30 static bool link_dhcp6_enabled(Link *link) {
31 assert(link);
32
33 if (!socket_ipv6_is_supported())
34 return false;
35
36 if (link->flags & IFF_LOOPBACK)
37 return false;
38
39 if (!link->network)
40 return false;
41
42 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
43 }
44
45 static bool link_dhcp4_enabled(Link *link) {
46 assert(link);
47
48 if (link->flags & IFF_LOOPBACK)
49 return false;
50
51 if (!link->network)
52 return false;
53
54 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
55 }
56
57 static bool link_dhcp4_server_enabled(Link *link) {
58 assert(link);
59
60 if (link->flags & IFF_LOOPBACK)
61 return false;
62
63 if (!link->network)
64 return false;
65
66 return link->network->dhcp_server;
67 }
68
69 static bool link_ipv4ll_enabled(Link *link) {
70 assert(link);
71
72 if (link->flags & IFF_LOOPBACK)
73 return false;
74
75 if (!link->network)
76 return false;
77
78 if (streq_ptr(link->kind, "wireguard"))
79 return false;
80
81 return link->network->link_local & ADDRESS_FAMILY_IPV4;
82 }
83
84 static bool link_ipv6ll_enabled(Link *link) {
85 assert(link);
86
87 if (!socket_ipv6_is_supported())
88 return false;
89
90 if (link->flags & IFF_LOOPBACK)
91 return false;
92
93 if (!link->network)
94 return false;
95
96 if (streq_ptr(link->kind, "wireguard"))
97 return false;
98
99 return link->network->link_local & ADDRESS_FAMILY_IPV6;
100 }
101
102 static bool link_ipv6_enabled(Link *link) {
103 assert(link);
104
105 if (!socket_ipv6_is_supported())
106 return false;
107
108 if (link->network->bridge)
109 return false;
110
111 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
112 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
113 }
114
115 static bool link_radv_enabled(Link *link) {
116 assert(link);
117
118 if (!link_ipv6ll_enabled(link))
119 return false;
120
121 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
122 }
123
124 static bool link_lldp_rx_enabled(Link *link) {
125 assert(link);
126
127 if (link->flags & IFF_LOOPBACK)
128 return false;
129
130 if (link->iftype != ARPHRD_ETHER)
131 return false;
132
133 if (!link->network)
134 return false;
135
136 /* LLDP should be handled on bridge slaves as those have a direct
137 * connection to their peers not on the bridge master. Linux doesn't
138 * even (by default) forward lldp packets to the bridge master.*/
139 if (streq_ptr("bridge", link->kind))
140 return false;
141
142 return link->network->lldp_mode != LLDP_MODE_NO;
143 }
144
145 static bool link_lldp_emit_enabled(Link *link) {
146 assert(link);
147
148 if (link->flags & IFF_LOOPBACK)
149 return false;
150
151 if (link->iftype != ARPHRD_ETHER)
152 return false;
153
154 if (!link->network)
155 return false;
156
157 return link->network->lldp_emit != LLDP_EMIT_NO;
158 }
159
160 static bool link_ipv4_forward_enabled(Link *link) {
161 assert(link);
162
163 if (link->flags & IFF_LOOPBACK)
164 return false;
165
166 if (!link->network)
167 return false;
168
169 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
170 return false;
171
172 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
173 }
174
175 static bool link_ipv6_forward_enabled(Link *link) {
176 assert(link);
177
178 if (!socket_ipv6_is_supported())
179 return false;
180
181 if (link->flags & IFF_LOOPBACK)
182 return false;
183
184 if (!link->network)
185 return false;
186
187 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
188 return false;
189
190 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
191 }
192
193 static bool link_proxy_arp_enabled(Link *link) {
194 assert(link);
195
196 if (link->flags & IFF_LOOPBACK)
197 return false;
198
199 if (!link->network)
200 return false;
201
202 if (link->network->proxy_arp < 0)
203 return false;
204
205 return true;
206 }
207
208 static bool link_ipv6_accept_ra_enabled(Link *link) {
209 assert(link);
210
211 if (!socket_ipv6_is_supported())
212 return false;
213
214 if (link->flags & IFF_LOOPBACK)
215 return false;
216
217 if (!link->network)
218 return false;
219
220 if (!link_ipv6ll_enabled(link))
221 return false;
222
223 /* If unset use system default (enabled if local forwarding is disabled.
224 * disabled if local forwarding is enabled).
225 * If set, ignore or enforce RA independent of local forwarding state.
226 */
227 if (link->network->ipv6_accept_ra < 0)
228 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
229 return !link_ipv6_forward_enabled(link);
230 else if (link->network->ipv6_accept_ra > 0)
231 /* accept RA even if ip_forward is enabled */
232 return true;
233 else
234 /* ignore RA */
235 return false;
236 }
237
238 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
239 assert(link);
240
241 if (!socket_ipv6_is_supported())
242 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
243
244 if (link->flags & IFF_LOOPBACK)
245 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
246
247 if (!link->network)
248 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
249
250 return link->network->ipv6_privacy_extensions;
251 }
252
253 static int link_enable_ipv6(Link *link) {
254 const char *p = NULL;
255 bool disabled;
256 int r;
257
258 if (link->flags & IFF_LOOPBACK)
259 return 0;
260
261 disabled = !link_ipv6_enabled(link);
262
263 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/disable_ipv6");
264
265 r = write_string_file(p, one_zero(disabled), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
266 if (r < 0)
267 log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m",
268 enable_disable(!disabled), link->ifname);
269 else
270 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
271
272 return 0;
273 }
274
275 void link_update_operstate(Link *link) {
276 LinkOperationalState operstate;
277 assert(link);
278
279 if (link->kernel_operstate == IF_OPER_DORMANT)
280 operstate = LINK_OPERSTATE_DORMANT;
281 else if (link_has_carrier(link)) {
282 Address *address;
283 uint8_t scope = RT_SCOPE_NOWHERE;
284 Iterator i;
285
286 /* if we have carrier, check what addresses we have */
287 SET_FOREACH(address, link->addresses, i) {
288 if (!address_is_ready(address))
289 continue;
290
291 if (address->scope < scope)
292 scope = address->scope;
293 }
294
295 /* for operstate we also take foreign addresses into account */
296 SET_FOREACH(address, link->addresses_foreign, i) {
297 if (!address_is_ready(address))
298 continue;
299
300 if (address->scope < scope)
301 scope = address->scope;
302 }
303
304 if (scope < RT_SCOPE_SITE)
305 /* universally accessible addresses found */
306 operstate = LINK_OPERSTATE_ROUTABLE;
307 else if (scope < RT_SCOPE_HOST)
308 /* only link or site local addresses found */
309 operstate = LINK_OPERSTATE_DEGRADED;
310 else
311 /* no useful addresses found */
312 operstate = LINK_OPERSTATE_CARRIER;
313 } else if (link->flags & IFF_UP)
314 operstate = LINK_OPERSTATE_NO_CARRIER;
315 else
316 operstate = LINK_OPERSTATE_OFF;
317
318 if (link->operstate != operstate) {
319 link->operstate = operstate;
320 link_send_changed(link, "OperationalState", NULL);
321 link_dirty(link);
322 }
323 }
324
325 #define FLAG_STRING(string, flag, old, new) \
326 (((old ^ new) & flag) \
327 ? ((old & flag) ? (" -" string) : (" +" string)) \
328 : "")
329
330 static int link_update_flags(Link *link, sd_netlink_message *m) {
331 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
332 uint8_t operstate;
333 int r;
334
335 assert(link);
336
337 r = sd_rtnl_message_link_get_flags(m, &flags);
338 if (r < 0)
339 return log_link_warning_errno(link, r, "Could not get link flags: %m");
340
341 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
342 if (r < 0)
343 /* if we got a message without operstate, take it to mean
344 the state was unchanged */
345 operstate = link->kernel_operstate;
346
347 if ((link->flags == flags) && (link->kernel_operstate == operstate))
348 return 0;
349
350 if (link->flags != flags) {
351 log_link_debug(link, "Flags change:%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
352 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
353 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
354 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
355 FLAG_STRING("UP", IFF_UP, link->flags, flags),
356 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
357 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
358 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
359 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
360 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
361 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
362 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
363 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
364 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
365 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
366 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
367 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
368 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
369 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
370 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
371
372 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
373 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
374 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
375 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
376 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
377 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
378 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
379 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
380
381 /* link flags are currently at most 18 bits, let's align to
382 * printing 20 */
383 if (unknown_flags_added)
384 log_link_debug(link,
385 "Unknown link flags gained: %#.5x (ignoring)",
386 unknown_flags_added);
387
388 if (unknown_flags_removed)
389 log_link_debug(link,
390 "Unknown link flags lost: %#.5x (ignoring)",
391 unknown_flags_removed);
392 }
393
394 link->flags = flags;
395 link->kernel_operstate = operstate;
396
397 link_update_operstate(link);
398
399 return 0;
400 }
401
402 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
403 _cleanup_(link_unrefp) Link *link = NULL;
404 uint16_t type;
405 const char *ifname, *kind = NULL;
406 int r, ifindex;
407 unsigned short iftype;
408
409 assert(manager);
410 assert(message);
411 assert(ret);
412
413 /* check for link kind */
414 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
415 if (r == 0) {
416 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
417 r = sd_netlink_message_exit_container(message);
418 if (r < 0)
419 return r;
420 }
421
422 r = sd_netlink_message_get_type(message, &type);
423 if (r < 0)
424 return r;
425 else if (type != RTM_NEWLINK)
426 return -EINVAL;
427
428 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
429 if (r < 0)
430 return r;
431 else if (ifindex <= 0)
432 return -EINVAL;
433
434 r = sd_rtnl_message_link_get_type(message, &iftype);
435 if (r < 0)
436 return r;
437
438 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
439 if (r < 0)
440 return r;
441
442 link = new0(Link, 1);
443 if (!link)
444 return -ENOMEM;
445
446 link->n_ref = 1;
447 link->manager = manager;
448 link->state = LINK_STATE_PENDING;
449 link->rtnl_extended_attrs = true;
450 link->ifindex = ifindex;
451 link->iftype = iftype;
452 link->ifname = strdup(ifname);
453 if (!link->ifname)
454 return -ENOMEM;
455
456 if (kind) {
457 link->kind = strdup(kind);
458 if (!link->kind)
459 return -ENOMEM;
460 }
461
462 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
463 if (r < 0)
464 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
465
466 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
467 return -ENOMEM;
468
469 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
470 return -ENOMEM;
471
472 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
473 return -ENOMEM;
474
475 r = hashmap_ensure_allocated(&manager->links, NULL);
476 if (r < 0)
477 return r;
478
479 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
480 if (r < 0)
481 return r;
482
483 r = link_update_flags(link, message);
484 if (r < 0)
485 return r;
486
487 *ret = TAKE_PTR(link);
488
489 return 0;
490 }
491
492 static void link_free(Link *link) {
493 Address *address;
494 Link *carrier;
495 Route *route;
496 Iterator i;
497
498 if (!link)
499 return;
500
501 while ((route = set_first(link->routes)))
502 route_free(route);
503
504 while ((route = set_first(link->routes_foreign)))
505 route_free(route);
506
507 link->routes = set_free(link->routes);
508 link->routes_foreign = set_free(link->routes_foreign);
509
510 while ((address = set_first(link->addresses)))
511 address_free(address);
512
513 while ((address = set_first(link->addresses_foreign)))
514 address_free(address);
515
516 link->addresses = set_free(link->addresses);
517 link->addresses_foreign = set_free(link->addresses_foreign);
518
519 while ((address = link->pool_addresses)) {
520 LIST_REMOVE(addresses, link->pool_addresses, address);
521 address_free(address);
522 }
523
524 sd_dhcp_server_unref(link->dhcp_server);
525 sd_dhcp_client_unref(link->dhcp_client);
526 sd_dhcp_lease_unref(link->dhcp_lease);
527
528 link_lldp_emit_stop(link);
529
530 free(link->lease_file);
531
532 sd_lldp_unref(link->lldp);
533 free(link->lldp_file);
534
535 ndisc_flush(link);
536
537 sd_ipv4ll_unref(link->ipv4ll);
538 sd_dhcp6_client_unref(link->dhcp6_client);
539 sd_ndisc_unref(link->ndisc);
540 sd_radv_unref(link->radv);
541
542 if (link->manager)
543 hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex));
544
545 free(link->ifname);
546
547 free(link->kind);
548
549 (void) unlink(link->state_file);
550 free(link->state_file);
551
552 udev_device_unref(link->udev_device);
553
554 HASHMAP_FOREACH (carrier, link->bound_to_links, i)
555 hashmap_remove(link->bound_to_links, INT_TO_PTR(carrier->ifindex));
556 hashmap_free(link->bound_to_links);
557
558 HASHMAP_FOREACH (carrier, link->bound_by_links, i)
559 hashmap_remove(link->bound_by_links, INT_TO_PTR(carrier->ifindex));
560 hashmap_free(link->bound_by_links);
561
562 free(link);
563 }
564
565 Link *link_unref(Link *link) {
566 if (!link)
567 return NULL;
568
569 assert(link->n_ref > 0);
570
571 link->n_ref--;
572
573 if (link->n_ref > 0)
574 return NULL;
575
576 link_free(link);
577
578 return NULL;
579 }
580
581 Link *link_ref(Link *link) {
582 if (!link)
583 return NULL;
584
585 assert(link->n_ref > 0);
586
587 link->n_ref++;
588
589 return link;
590 }
591
592 int link_get(Manager *m, int ifindex, Link **ret) {
593 Link *link;
594
595 assert(m);
596 assert(ifindex);
597 assert(ret);
598
599 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
600 if (!link)
601 return -ENODEV;
602
603 *ret = link;
604
605 return 0;
606 }
607
608 static void link_set_state(Link *link, LinkState state) {
609 assert(link);
610
611 if (link->state == state)
612 return;
613
614 link->state = state;
615
616 link_send_changed(link, "AdministrativeState", NULL);
617 }
618
619 static void link_enter_unmanaged(Link *link) {
620 assert(link);
621
622 log_link_debug(link, "Unmanaged");
623
624 link_set_state(link, LINK_STATE_UNMANAGED);
625
626 link_dirty(link);
627 }
628
629 static int link_stop_clients(Link *link) {
630 int r = 0, k;
631
632 assert(link);
633 assert(link->manager);
634 assert(link->manager->event);
635
636 if (link->dhcp_client) {
637 k = sd_dhcp_client_stop(link->dhcp_client);
638 if (k < 0)
639 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
640 }
641
642 if (link->ipv4ll) {
643 k = sd_ipv4ll_stop(link->ipv4ll);
644 if (k < 0)
645 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
646 }
647
648 if (link->dhcp6_client) {
649 k = sd_dhcp6_client_stop(link->dhcp6_client);
650 if (k < 0)
651 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
652 }
653
654 if (link->ndisc) {
655 k = sd_ndisc_stop(link->ndisc);
656 if (k < 0)
657 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
658 }
659
660 if (link->radv) {
661 k = sd_radv_stop(link->radv);
662 if (k < 0)
663 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
664 }
665
666 link_lldp_emit_stop(link);
667 return r;
668 }
669
670 void link_enter_failed(Link *link) {
671 assert(link);
672
673 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
674 return;
675
676 log_link_warning(link, "Failed");
677
678 link_set_state(link, LINK_STATE_FAILED);
679
680 link_stop_clients(link);
681
682 link_dirty(link);
683 }
684
685 static Address* link_find_dhcp_server_address(Link *link) {
686 Address *address;
687
688 assert(link);
689 assert(link->network);
690
691 /* The first statically configured address if there is any */
692 LIST_FOREACH(addresses, address, link->network->static_addresses) {
693
694 if (address->family != AF_INET)
695 continue;
696
697 if (in_addr_is_null(address->family, &address->in_addr))
698 continue;
699
700 return address;
701 }
702
703 /* If that didn't work, find a suitable address we got from the pool */
704 LIST_FOREACH(addresses, address, link->pool_addresses) {
705 if (address->family != AF_INET)
706 continue;
707
708 return address;
709 }
710
711 return NULL;
712 }
713
714 static void link_enter_configured(Link *link) {
715 assert(link);
716 assert(link->network);
717
718 if (link->state != LINK_STATE_SETTING_ROUTES)
719 return;
720
721 log_link_info(link, "Configured");
722
723 link_set_state(link, LINK_STATE_CONFIGURED);
724
725 link_dirty(link);
726 }
727
728 void link_check_ready(Link *link) {
729 Address *a;
730 Iterator i;
731
732 assert(link);
733
734 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
735 return;
736
737 if (!link->network)
738 return;
739
740 if (!link->static_routes_configured)
741 return;
742
743 if (!link->routing_policy_rules_configured)
744 return;
745
746 if (link_ipv4ll_enabled(link))
747 if (!link->ipv4ll_address ||
748 !link->ipv4ll_route)
749 return;
750
751 if (!link->network->bridge) {
752
753 if (link_ipv6ll_enabled(link))
754 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) > 0)
755 return;
756
757 if ((link_dhcp4_enabled(link) && !link_dhcp6_enabled(link) &&
758 !link->dhcp4_configured) ||
759 (link_dhcp6_enabled(link) && !link_dhcp4_enabled(link) &&
760 !link->dhcp6_configured) ||
761 (link_dhcp4_enabled(link) && link_dhcp6_enabled(link) &&
762 !link->dhcp4_configured && !link->dhcp6_configured))
763 return;
764
765 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
766 return;
767 }
768
769 SET_FOREACH(a, link->addresses, i)
770 if (!address_is_ready(a))
771 return;
772
773 if (link->state != LINK_STATE_CONFIGURED)
774 link_enter_configured(link);
775
776 return;
777 }
778
779 static int link_set_routing_policy_rule(Link *link) {
780 RoutingPolicyRule *rule, *rrule = NULL;
781 int r;
782
783 assert(link);
784 assert(link->network);
785
786 LIST_FOREACH(rules, rule, link->network->rules) {
787 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
788 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif, &rrule);
789 if (r == 1) {
790 (void) routing_policy_rule_make_local(link->manager, rrule);
791 continue;
792 }
793
794 r = routing_policy_rule_configure(rule, link, link_routing_policy_rule_handler, false);
795 if (r < 0) {
796 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
797 link_enter_failed(link);
798 return r;
799 }
800
801 link->routing_policy_rule_messages++;
802 }
803
804 routing_policy_rule_purge(link->manager, link);
805 if (link->routing_policy_rule_messages == 0) {
806 link->routing_policy_rules_configured = true;
807 link_check_ready(link);
808 } else
809 log_link_debug(link, "Setting routing policy rules");
810
811 return 0;
812 }
813
814 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
815 _cleanup_(link_unrefp) Link *link = userdata;
816 int r;
817
818 assert(link->route_messages > 0);
819 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
820 LINK_STATE_SETTING_ROUTES, LINK_STATE_FAILED,
821 LINK_STATE_LINGER));
822
823 link->route_messages--;
824
825 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
826 return 1;
827
828 r = sd_netlink_message_get_errno(m);
829 if (r < 0 && r != -EEXIST)
830 log_link_warning_errno(link, r, "Could not set route: %m");
831
832 if (link->route_messages == 0) {
833 log_link_debug(link, "Routes set");
834 link->static_routes_configured = true;
835 link_check_ready(link);
836 }
837
838 return 1;
839 }
840
841 static int link_enter_set_routes(Link *link) {
842 Route *rt;
843 int r;
844
845 assert(link);
846 assert(link->network);
847 assert(link->state == LINK_STATE_SETTING_ADDRESSES);
848
849 (void) link_set_routing_policy_rule(link);
850
851 link_set_state(link, LINK_STATE_SETTING_ROUTES);
852
853 LIST_FOREACH(routes, rt, link->network->static_routes) {
854 r = route_configure(rt, link, route_handler);
855 if (r < 0) {
856 log_link_warning_errno(link, r, "Could not set routes: %m");
857 link_enter_failed(link);
858 return r;
859 }
860
861 link->route_messages++;
862 }
863
864 if (link->route_messages == 0) {
865 link->static_routes_configured = true;
866 link_check_ready(link);
867 } else
868 log_link_debug(link, "Setting routes");
869
870 return 0;
871 }
872
873 int link_route_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
874 _cleanup_(link_unrefp) Link *link = userdata;
875 int r;
876
877 assert(m);
878 assert(link);
879 assert(link->ifname);
880
881 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
882 return 1;
883
884 r = sd_netlink_message_get_errno(m);
885 if (r < 0 && r != -ESRCH)
886 log_link_warning_errno(link, r, "Could not drop route: %m");
887
888 return 1;
889 }
890
891 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
892 _cleanup_(link_unrefp) Link *link = userdata;
893 int r;
894
895 assert(rtnl);
896 assert(m);
897 assert(link);
898 assert(link->ifname);
899 assert(link->address_messages > 0);
900 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
901 LINK_STATE_FAILED, LINK_STATE_LINGER));
902
903 link->address_messages--;
904
905 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
906 return 1;
907
908 r = sd_netlink_message_get_errno(m);
909 if (r < 0 && r != -EEXIST)
910 log_link_warning_errno(link, r, "could not set address: %m");
911 else if (r >= 0)
912 manager_rtnl_process_address(rtnl, m, link->manager);
913
914 if (link->address_messages == 0) {
915 log_link_debug(link, "Addresses set");
916 link_enter_set_routes(link);
917 }
918
919 return 1;
920 }
921
922 static int address_label_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
923 _cleanup_(link_unrefp) Link *link = userdata;
924 int r;
925
926 assert(rtnl);
927 assert(m);
928 assert(link);
929 assert(link->ifname);
930 assert(link->address_label_messages > 0);
931
932 link->address_label_messages--;
933
934 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
935 return 1;
936
937 r = sd_netlink_message_get_errno(m);
938 if (r < 0 && r != -EEXIST)
939 log_link_warning_errno(link, r, "could not set address label: %m");
940 else if (r >= 0)
941 manager_rtnl_process_address(rtnl, m, link->manager);
942
943 if (link->address_label_messages == 0)
944 log_link_debug(link, "Addresses label set");
945
946 return 1;
947 }
948
949 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
950 _cleanup_free_ struct in_addr *addresses = NULL;
951 size_t n_addresses = 0, n_allocated = 0;
952 unsigned i;
953
954 log_debug("Copying DNS server information from %s", link->ifname);
955
956 if (!link->network)
957 return 0;
958
959 for (i = 0; i < link->network->n_dns; i++) {
960 struct in_addr ia;
961
962 /* Only look for IPv4 addresses */
963 if (link->network->dns[i].family != AF_INET)
964 continue;
965
966 ia = link->network->dns[i].address.in;
967
968 /* Never propagate obviously borked data */
969 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
970 continue;
971
972 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
973 return log_oom();
974
975 addresses[n_addresses++] = ia;
976 }
977
978 if (link->network->dhcp_use_dns && link->dhcp_lease) {
979 const struct in_addr *da = NULL;
980 int n;
981
982 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
983 if (n > 0) {
984
985 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
986 return log_oom();
987
988 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
989 n_addresses += n;
990 }
991 }
992
993 if (n_addresses <= 0)
994 return 0;
995
996 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
997 }
998
999 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1000 _cleanup_free_ struct in_addr *addresses = NULL;
1001 size_t n_addresses = 0, n_allocated = 0;
1002 char **a;
1003
1004 if (!link->network)
1005 return 0;
1006
1007 log_debug("Copying NTP server information from %s", link->ifname);
1008
1009 STRV_FOREACH(a, link->network->ntp) {
1010 struct in_addr ia;
1011
1012 /* Only look for IPv4 addresses */
1013 if (inet_pton(AF_INET, *a, &ia) <= 0)
1014 continue;
1015
1016 /* Never propagate obviously borked data */
1017 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1018 continue;
1019
1020 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1021 return log_oom();
1022
1023 addresses[n_addresses++] = ia;
1024 }
1025
1026 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1027 const struct in_addr *da = NULL;
1028 int n;
1029
1030 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1031 if (n > 0) {
1032
1033 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1034 return log_oom();
1035
1036 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
1037 n_addresses += n;
1038 }
1039 }
1040
1041 if (n_addresses <= 0)
1042 return 0;
1043
1044 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1045 }
1046
1047 static int link_set_bridge_fdb(Link *link) {
1048 FdbEntry *fdb_entry;
1049 int r;
1050
1051 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1052 r = fdb_entry_configure(link, fdb_entry);
1053 if (r < 0)
1054 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1055 }
1056
1057 return 0;
1058 }
1059
1060 static int link_enter_set_addresses(Link *link) {
1061 AddressLabel *label;
1062 Address *ad;
1063 int r;
1064
1065 assert(link);
1066 assert(link->network);
1067 assert(link->state != _LINK_STATE_INVALID);
1068
1069 r = link_set_bridge_fdb(link);
1070 if (r < 0)
1071 return r;
1072
1073 link_set_state(link, LINK_STATE_SETTING_ADDRESSES);
1074
1075 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1076 r = address_configure(ad, link, address_handler, false);
1077 if (r < 0) {
1078 log_link_warning_errno(link, r, "Could not set addresses: %m");
1079 link_enter_failed(link);
1080 return r;
1081 }
1082
1083 link->address_messages++;
1084 }
1085
1086 LIST_FOREACH(labels, label, link->network->address_labels) {
1087 r = address_label_configure(label, link, address_label_handler, false);
1088 if (r < 0) {
1089 log_link_warning_errno(link, r, "Could not set address label: %m");
1090 link_enter_failed(link);
1091 return r;
1092 }
1093
1094 link->address_label_messages++;
1095 }
1096
1097 /* now that we can figure out a default address for the dhcp server,
1098 start it */
1099 if (link_dhcp4_server_enabled(link)) {
1100 Address *address;
1101 Link *uplink = NULL;
1102 bool acquired_uplink = false;
1103
1104 address = link_find_dhcp_server_address(link);
1105 if (!address) {
1106 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1107 link_enter_failed(link);
1108 return 0;
1109 }
1110
1111 /* use the server address' subnet as the pool */
1112 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1113 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1114 if (r < 0)
1115 return r;
1116
1117 /* TODO:
1118 r = sd_dhcp_server_set_router(link->dhcp_server,
1119 &main_address->in_addr.in);
1120 if (r < 0)
1121 return r;
1122 */
1123
1124 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1125 r = sd_dhcp_server_set_max_lease_time(
1126 link->dhcp_server,
1127 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1128 if (r < 0)
1129 return r;
1130 }
1131
1132 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1133 r = sd_dhcp_server_set_default_lease_time(
1134 link->dhcp_server,
1135 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1136 if (r < 0)
1137 return r;
1138 }
1139
1140 if (link->network->dhcp_server_emit_dns) {
1141
1142 if (link->network->n_dhcp_server_dns > 0)
1143 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1144 else {
1145 uplink = manager_find_uplink(link->manager, link);
1146 acquired_uplink = true;
1147
1148 if (!uplink) {
1149 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1150 r = 0;
1151 } else
1152 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1153 }
1154 if (r < 0)
1155 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1156 }
1157
1158 if (link->network->dhcp_server_emit_ntp) {
1159
1160 if (link->network->n_dhcp_server_ntp > 0)
1161 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1162 else {
1163 if (!acquired_uplink)
1164 uplink = manager_find_uplink(link->manager, link);
1165
1166 if (!uplink) {
1167 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1168 r = 0;
1169 } else
1170 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1171
1172 }
1173 if (r < 0)
1174 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1175 }
1176
1177 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1178 if (r < 0)
1179 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1180
1181 if (link->network->dhcp_server_emit_timezone) {
1182 _cleanup_free_ char *buffer = NULL;
1183 const char *tz = NULL;
1184
1185 if (link->network->dhcp_server_timezone)
1186 tz = link->network->dhcp_server_timezone;
1187 else {
1188 r = get_timezone(&buffer);
1189 if (r < 0)
1190 log_warning_errno(r, "Failed to determine timezone: %m");
1191 else
1192 tz = buffer;
1193 }
1194
1195 if (tz) {
1196 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1197 if (r < 0)
1198 return r;
1199 }
1200 }
1201
1202 r = sd_dhcp_server_start(link->dhcp_server);
1203 if (r < 0) {
1204 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1205
1206 link_enter_failed(link);
1207
1208 return 0;
1209 }
1210
1211 log_link_debug(link, "Offering DHCPv4 leases");
1212 }
1213
1214 if (link->address_messages == 0)
1215 link_enter_set_routes(link);
1216 else
1217 log_link_debug(link, "Setting addresses");
1218
1219 return 0;
1220 }
1221
1222 int link_address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1223 _cleanup_(link_unrefp) Link *link = userdata;
1224 int r;
1225
1226 assert(m);
1227 assert(link);
1228 assert(link->ifname);
1229
1230 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1231 return 1;
1232
1233 r = sd_netlink_message_get_errno(m);
1234 if (r < 0 && r != -EADDRNOTAVAIL)
1235 log_link_warning_errno(link, r, "Could not drop address: %m");
1236
1237 return 1;
1238 }
1239
1240 static int link_set_bridge_vlan(Link *link) {
1241 int r = 0;
1242
1243 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1244 if (r < 0)
1245 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1246
1247 return r;
1248 }
1249
1250 static int link_set_proxy_arp(Link *link) {
1251 const char *p = NULL;
1252 int r;
1253
1254 if (!link_proxy_arp_enabled(link))
1255 return 0;
1256
1257 p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/proxy_arp");
1258
1259 r = write_string_file(p, one_zero(link->network->proxy_arp), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
1260 if (r < 0)
1261 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1262
1263 return 0;
1264 }
1265
1266 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1267 _cleanup_(link_unrefp) Link *link = userdata;
1268 int r;
1269
1270 log_link_debug(link, "Set link");
1271
1272 r = sd_netlink_message_get_errno(m);
1273 if (r < 0 && r != -EEXIST) {
1274 log_link_error_errno(link, r, "Could not join netdev: %m");
1275 link_enter_failed(link);
1276 return 1;
1277 }
1278
1279 return 0;
1280 }
1281
1282 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1283 _cleanup_(link_unrefp) Link *link = userdata;
1284 int r;
1285
1286 assert(m);
1287 assert(link);
1288 assert(link->ifname);
1289
1290 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1291 return 1;
1292
1293 r = sd_netlink_message_get_errno(m);
1294 if (r < 0)
1295 log_link_warning_errno(link, r, "Could not set MTU: %m");
1296
1297 return 1;
1298 }
1299
1300 int link_set_mtu(Link *link, uint32_t mtu) {
1301 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1302 int r;
1303
1304 assert(link);
1305 assert(link->manager);
1306 assert(link->manager->rtnl);
1307
1308 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1309
1310 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1311 if (r < 0)
1312 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1313
1314 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1315 for this interface, or if it is a bridge slave, then disable IPv6 else enable it. */
1316 (void) link_enable_ipv6(link);
1317
1318 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1319 on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1320 if (link_ipv6_enabled(link) && link->network->mtu < IPV6_MIN_MTU) {
1321
1322 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1323 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1324
1325 link->network->mtu = IPV6_MIN_MTU;
1326 }
1327
1328 r = sd_netlink_message_append_u32(req, IFLA_MTU, link->network->mtu);
1329 if (r < 0)
1330 return log_link_error_errno(link, r, "Could not set MTU: %m");
1331
1332 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1333 if (r < 0)
1334 return log_link_error_errno(link, r, "Could not append MTU: %m");
1335
1336 r = sd_netlink_call_async(link->manager->rtnl, req, set_mtu_handler, link, 0, NULL);
1337 if (r < 0)
1338 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1339
1340 link->setting_mtu = true;
1341
1342 link_ref(link);
1343
1344 return 0;
1345 }
1346
1347 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1348 _cleanup_(link_unrefp) Link *link = userdata;
1349 int r;
1350
1351 assert(m);
1352 assert(link);
1353 assert(link->ifname);
1354
1355 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1356 return 1;
1357
1358 r = sd_netlink_message_get_errno(m);
1359 if (r < 0)
1360 log_link_warning_errno(link, r, "Could not set link flags: %m");
1361
1362 return 1;
1363 }
1364
1365 static int link_set_flags(Link *link) {
1366 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1367 unsigned ifi_change = 0;
1368 unsigned ifi_flags = 0;
1369 int r;
1370
1371 assert(link);
1372 assert(link->manager);
1373 assert(link->manager->rtnl);
1374
1375 if (link->flags & IFF_LOOPBACK)
1376 return 0;
1377
1378 if (!link->network)
1379 return 0;
1380
1381 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1382 return 0;
1383
1384 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1385 if (r < 0)
1386 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1387
1388 if (link->network->arp >= 0) {
1389 ifi_change |= IFF_NOARP;
1390 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1391 }
1392
1393 if (link->network->multicast >= 0) {
1394 ifi_change |= IFF_MULTICAST;
1395 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1396 }
1397
1398 if (link->network->allmulticast >= 0) {
1399 ifi_change |= IFF_ALLMULTI;
1400 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1401 }
1402
1403 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1404 if (r < 0)
1405 return log_link_error_errno(link, r, "Could not set link flags: %m");
1406
1407 r = sd_netlink_call_async(link->manager->rtnl, req, set_flags_handler, link, 0, NULL);
1408 if (r < 0)
1409 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1410
1411 link_ref(link);
1412
1413 return 0;
1414 }
1415
1416 static int link_set_bridge(Link *link) {
1417 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1418 int r;
1419
1420 assert(link);
1421 assert(link->network);
1422
1423 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1424 if (r < 0)
1425 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1426
1427 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1428 if (r < 0)
1429 return log_link_error_errno(link, r, "Could not set message family: %m");
1430
1431 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1432 if (r < 0)
1433 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1434
1435 if (link->network->use_bpdu >= 0) {
1436 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
1437 if (r < 0)
1438 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1439 }
1440
1441 if (link->network->hairpin >= 0) {
1442 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1443 if (r < 0)
1444 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1445 }
1446
1447 if (link->network->fast_leave >= 0) {
1448 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1449 if (r < 0)
1450 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1451 }
1452
1453 if (link->network->allow_port_to_be_root >= 0) {
1454 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
1455 if (r < 0)
1456 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1457
1458 }
1459
1460 if (link->network->unicast_flood >= 0) {
1461 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1462 if (r < 0)
1463 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1464
1465 }
1466
1467 if (link->network->cost != 0) {
1468 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1469 if (r < 0)
1470 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1471 }
1472 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1473 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1474 if (r < 0)
1475 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1476 }
1477
1478 r = sd_netlink_message_close_container(req);
1479 if (r < 0)
1480 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1481
1482 r = sd_netlink_call_async(link->manager->rtnl, req, link_set_handler, link, 0, NULL);
1483 if (r < 0)
1484 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1485
1486 link_ref(link);
1487
1488 return r;
1489 }
1490
1491 static int link_bond_set(Link *link) {
1492 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1493 int r;
1494
1495 assert(link);
1496 assert(link->network);
1497
1498 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1499 if (r < 0)
1500 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1501
1502 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1503 if (r < 0)
1504 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1505
1506 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1507 if (r < 0)
1508 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1509
1510 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1511 if (r < 0)
1512 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1513
1514 if (link->network->active_slave) {
1515 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1516 if (r < 0)
1517 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1518 }
1519
1520 if (link->network->primary_slave) {
1521 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1522 if (r < 0)
1523 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1524 }
1525
1526 r = sd_netlink_message_close_container(req);
1527 if (r < 0)
1528 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1529
1530 r = sd_netlink_message_close_container(req);
1531 if (r < 0)
1532 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1533
1534 r = sd_netlink_call_async(link->manager->rtnl, req, set_flags_handler, link, 0, NULL);
1535 if (r < 0)
1536 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1537
1538 link_ref(link);
1539
1540 return r;
1541 }
1542
1543 static int link_lldp_save(Link *link) {
1544 _cleanup_free_ char *temp_path = NULL;
1545 _cleanup_fclose_ FILE *f = NULL;
1546 sd_lldp_neighbor **l = NULL;
1547 int n = 0, r, i;
1548
1549 assert(link);
1550 assert(link->lldp_file);
1551
1552 if (!link->lldp) {
1553 (void) unlink(link->lldp_file);
1554 return 0;
1555 }
1556
1557 r = sd_lldp_get_neighbors(link->lldp, &l);
1558 if (r < 0)
1559 goto finish;
1560 if (r == 0) {
1561 (void) unlink(link->lldp_file);
1562 goto finish;
1563 }
1564
1565 n = r;
1566
1567 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1568 if (r < 0)
1569 goto finish;
1570
1571 fchmod(fileno(f), 0644);
1572
1573 for (i = 0; i < n; i++) {
1574 const void *p;
1575 le64_t u;
1576 size_t sz;
1577
1578 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1579 if (r < 0)
1580 goto finish;
1581
1582 u = htole64(sz);
1583 (void) fwrite(&u, 1, sizeof(u), f);
1584 (void) fwrite(p, 1, sz, f);
1585 }
1586
1587 r = fflush_and_check(f);
1588 if (r < 0)
1589 goto finish;
1590
1591 if (rename(temp_path, link->lldp_file) < 0) {
1592 r = -errno;
1593 goto finish;
1594 }
1595
1596 finish:
1597 if (r < 0) {
1598 (void) unlink(link->lldp_file);
1599 if (temp_path)
1600 (void) unlink(temp_path);
1601
1602 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1603 }
1604
1605 if (l) {
1606 for (i = 0; i < n; i++)
1607 sd_lldp_neighbor_unref(l[i]);
1608 free(l);
1609 }
1610
1611 return r;
1612 }
1613
1614 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1615 Link *link = userdata;
1616 int r;
1617
1618 assert(link);
1619
1620 (void) link_lldp_save(link);
1621
1622 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1623 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1624
1625 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1626
1627 r = link_lldp_emit_start(link);
1628 if (r < 0)
1629 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1630 }
1631 }
1632
1633 static int link_acquire_ipv6_conf(Link *link) {
1634 int r;
1635
1636 assert(link);
1637
1638 if (link_dhcp6_enabled(link)) {
1639 assert(link->dhcp6_client);
1640 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1641
1642 /* start DHCPv6 client in stateless mode */
1643 r = dhcp6_request_address(link, true);
1644 if (r < 0 && r != -EBUSY)
1645 return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m");
1646 else
1647 log_link_debug(link, "Acquiring DHCPv6 lease");
1648 }
1649
1650 if (link_ipv6_accept_ra_enabled(link)) {
1651 assert(link->ndisc);
1652
1653 log_link_debug(link, "Discovering IPv6 routers");
1654
1655 r = sd_ndisc_start(link->ndisc);
1656 if (r < 0 && r != -EBUSY)
1657 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1658 }
1659
1660 if (link_radv_enabled(link)) {
1661 assert(link->radv);
1662 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1663
1664 log_link_debug(link, "Starting IPv6 Router Advertisements");
1665
1666 r = sd_radv_start(link->radv);
1667 if (r < 0 && r != -EBUSY)
1668 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1669 }
1670
1671 return 0;
1672 }
1673
1674 static int link_acquire_ipv4_conf(Link *link) {
1675 int r;
1676
1677 assert(link);
1678 assert(link->network);
1679 assert(link->manager);
1680 assert(link->manager->event);
1681
1682 if (link_ipv4ll_enabled(link)) {
1683 assert(link->ipv4ll);
1684
1685 log_link_debug(link, "Acquiring IPv4 link-local address");
1686
1687 r = sd_ipv4ll_start(link->ipv4ll);
1688 if (r < 0)
1689 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1690 }
1691
1692 if (link_dhcp4_enabled(link)) {
1693 assert(link->dhcp_client);
1694
1695 log_link_debug(link, "Acquiring DHCPv4 lease");
1696
1697 r = sd_dhcp_client_start(link->dhcp_client);
1698 if (r < 0)
1699 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1700 }
1701
1702 return 0;
1703 }
1704
1705 static int link_acquire_conf(Link *link) {
1706 int r;
1707
1708 assert(link);
1709
1710 if (link->setting_mtu) {
1711 link->setting_mtu = false;
1712 return 0;
1713 }
1714
1715 r = link_acquire_ipv4_conf(link);
1716 if (r < 0)
1717 return r;
1718
1719 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) == 0) {
1720 r = link_acquire_ipv6_conf(link);
1721 if (r < 0)
1722 return r;
1723 }
1724
1725 if (link_lldp_emit_enabled(link)) {
1726 r = link_lldp_emit_start(link);
1727 if (r < 0)
1728 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1729 }
1730
1731 return 0;
1732 }
1733
1734 bool link_has_carrier(Link *link) {
1735 /* see Documentation/networking/operstates.txt in the kernel sources */
1736
1737 if (link->kernel_operstate == IF_OPER_UP)
1738 return true;
1739
1740 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1741 /* operstate may not be implemented, so fall back to flags */
1742 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1743 return true;
1744
1745 return false;
1746 }
1747
1748 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1749 _cleanup_(link_unrefp) Link *link = userdata;
1750 int r;
1751
1752 assert(link);
1753
1754 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1755 return 1;
1756
1757 r = sd_netlink_message_get_errno(m);
1758 if (r < 0)
1759 /* we warn but don't fail the link, as it may be
1760 brought up later */
1761 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1762
1763 return 1;
1764 }
1765
1766 int link_up(Link *link) {
1767 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1768 uint8_t ipv6ll_mode;
1769 int r;
1770
1771 assert(link);
1772 assert(link->network);
1773 assert(link->manager);
1774 assert(link->manager->rtnl);
1775
1776 log_link_debug(link, "Bringing link up");
1777
1778 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1779 if (r < 0)
1780 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1781
1782 /* set it free if not enslaved with networkd */
1783 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1784 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1785 if (r < 0)
1786 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1787 }
1788
1789 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1790 if (r < 0)
1791 return log_link_error_errno(link, r, "Could not set link flags: %m");
1792
1793 if (link->network->mac) {
1794 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1795 if (r < 0)
1796 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1797 }
1798
1799 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1800 if (r < 0)
1801 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1802
1803 if (link_ipv6_enabled(link)) {
1804 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
1805 r = sd_netlink_message_open_container(req, AF_INET6);
1806 if (r < 0)
1807 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1808
1809 if (!link_ipv6ll_enabled(link))
1810 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1811 else {
1812 const char *p = NULL;
1813 _cleanup_free_ char *stable_secret = NULL;
1814
1815 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/stable_secret");
1816 r = read_one_line_file(p, &stable_secret);
1817
1818 if (r < 0)
1819 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1820 else
1821 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1822 }
1823 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1824 if (r < 0)
1825 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1826
1827 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
1828 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
1829 if (r < 0)
1830 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
1831 }
1832
1833 r = sd_netlink_message_close_container(req);
1834 if (r < 0)
1835 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1836 }
1837
1838 r = sd_netlink_message_close_container(req);
1839 if (r < 0)
1840 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1841
1842 r = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
1843 if (r < 0)
1844 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1845
1846 link_ref(link);
1847
1848 return 0;
1849 }
1850
1851 static int link_up_can(Link *link) {
1852 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1853 int r;
1854
1855 assert(link);
1856
1857 log_link_debug(link, "Bringing CAN link up");
1858
1859 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1860 if (r < 0)
1861 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1862
1863 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1864 if (r < 0)
1865 return log_link_error_errno(link, r, "Could not set link flags: %m");
1866
1867 r = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
1868 if (r < 0)
1869 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1870
1871 link_ref(link);
1872
1873 return 0;
1874 }
1875
1876 static int link_set_can(Link *link) {
1877 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
1878 int r;
1879
1880 assert(link);
1881 assert(link->network);
1882 assert(link->manager);
1883 assert(link->manager->rtnl);
1884
1885 log_link_debug(link, "link_set_can");
1886
1887 r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
1888 if (r < 0)
1889 return log_link_error_errno(link, r, "Failed to allocate netlink message: %m");
1890
1891 r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
1892 if (r < 0)
1893 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1894
1895 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
1896 if (r < 0)
1897 return log_link_error_errno(link, r, "Failed to open netlink container: %m");
1898
1899 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
1900 if (r < 0)
1901 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1902
1903 if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) {
1904 struct can_bittiming bt = {
1905 .bitrate = link->network->can_bitrate,
1906 .sample_point = link->network->can_sample_point,
1907 };
1908
1909 if (link->network->can_bitrate > UINT32_MAX) {
1910 log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate);
1911 return -ERANGE;
1912 }
1913
1914 log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate);
1915 if (link->network->can_sample_point > 0)
1916 log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
1917 else
1918 log_link_debug(link, "Using default sample point");
1919
1920 r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
1921 if (r < 0)
1922 return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
1923 }
1924
1925 if (link->network->can_restart_us > 0) {
1926 char time_string[FORMAT_TIMESPAN_MAX];
1927 uint64_t restart_ms;
1928
1929 if (link->network->can_restart_us == USEC_INFINITY)
1930 restart_ms = 0;
1931 else
1932 restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC);
1933
1934 format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC);
1935
1936 if (restart_ms > UINT32_MAX) {
1937 log_link_error(link, "restart timeout (%s) too big.", time_string);
1938 return -ERANGE;
1939 }
1940
1941 log_link_debug(link, "Setting restart = %s", time_string);
1942
1943 r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
1944 if (r < 0)
1945 return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
1946 }
1947
1948 r = sd_netlink_message_close_container(m);
1949 if (r < 0)
1950 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
1951
1952 r = sd_netlink_message_close_container(m);
1953 if (r < 0)
1954 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
1955
1956 r = sd_netlink_call_async(link->manager->rtnl, m, link_set_handler, link, 0, NULL);
1957 if (r < 0)
1958 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1959
1960 link_ref(link);
1961
1962 if (!(link->flags & IFF_UP)) {
1963 r = link_up_can(link);
1964 if (r < 0) {
1965 link_enter_failed(link);
1966 return r;
1967 }
1968 }
1969
1970 log_link_debug(link, "link_set_can done");
1971
1972 return r;
1973 }
1974
1975 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1976 _cleanup_(link_unrefp) Link *link = userdata;
1977 int r;
1978
1979 assert(link);
1980
1981 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1982 return 1;
1983
1984 r = sd_netlink_message_get_errno(m);
1985 if (r < 0)
1986 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1987
1988 if (streq_ptr(link->kind, "can")) {
1989 link_ref(link);
1990 link_set_can(link);
1991 }
1992
1993 return 1;
1994 }
1995
1996 int link_down(Link *link) {
1997 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1998 int r;
1999
2000 assert(link);
2001 assert(link->manager);
2002 assert(link->manager->rtnl);
2003
2004 log_link_debug(link, "Bringing link down");
2005
2006 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
2007 RTM_SETLINK, link->ifindex);
2008 if (r < 0)
2009 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2010
2011 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
2012 if (r < 0)
2013 return log_link_error_errno(link, r, "Could not set link flags: %m");
2014
2015 r = sd_netlink_call_async(link->manager->rtnl, req, link_down_handler, link, 0, NULL);
2016 if (r < 0)
2017 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2018
2019 link_ref(link);
2020
2021 return 0;
2022 }
2023
2024 static int link_handle_bound_to_list(Link *link) {
2025 Link *l;
2026 Iterator i;
2027 int r;
2028 bool required_up = false;
2029 bool link_is_up = false;
2030
2031 assert(link);
2032
2033 if (hashmap_isempty(link->bound_to_links))
2034 return 0;
2035
2036 if (link->flags & IFF_UP)
2037 link_is_up = true;
2038
2039 HASHMAP_FOREACH (l, link->bound_to_links, i)
2040 if (link_has_carrier(l)) {
2041 required_up = true;
2042 break;
2043 }
2044
2045 if (!required_up && link_is_up) {
2046 r = link_down(link);
2047 if (r < 0)
2048 return r;
2049 } else if (required_up && !link_is_up) {
2050 r = link_up(link);
2051 if (r < 0)
2052 return r;
2053 }
2054
2055 return 0;
2056 }
2057
2058 static int link_handle_bound_by_list(Link *link) {
2059 Iterator i;
2060 Link *l;
2061 int r;
2062
2063 assert(link);
2064
2065 if (hashmap_isempty(link->bound_by_links))
2066 return 0;
2067
2068 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2069 r = link_handle_bound_to_list(l);
2070 if (r < 0)
2071 return r;
2072 }
2073
2074 return 0;
2075 }
2076
2077 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2078 int r;
2079
2080 assert(link);
2081 assert(carrier);
2082
2083 if (link == carrier)
2084 return 0;
2085
2086 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2087 return 0;
2088
2089 r = hashmap_ensure_allocated(h, NULL);
2090 if (r < 0)
2091 return r;
2092
2093 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2094 if (r < 0)
2095 return r;
2096
2097 return 0;
2098 }
2099
2100 static int link_new_bound_by_list(Link *link) {
2101 Manager *m;
2102 Link *carrier;
2103 Iterator i;
2104 int r;
2105 bool list_updated = false;
2106
2107 assert(link);
2108 assert(link->manager);
2109
2110 m = link->manager;
2111
2112 HASHMAP_FOREACH(carrier, m->links, i) {
2113 if (!carrier->network)
2114 continue;
2115
2116 if (strv_isempty(carrier->network->bind_carrier))
2117 continue;
2118
2119 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2120 r = link_put_carrier(link, carrier, &link->bound_by_links);
2121 if (r < 0)
2122 return r;
2123
2124 list_updated = true;
2125 }
2126 }
2127
2128 if (list_updated)
2129 link_dirty(link);
2130
2131 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2132 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2133 if (r < 0)
2134 return r;
2135
2136 link_dirty(carrier);
2137 }
2138
2139 return 0;
2140 }
2141
2142 static int link_new_bound_to_list(Link *link) {
2143 Manager *m;
2144 Link *carrier;
2145 Iterator i;
2146 int r;
2147 bool list_updated = false;
2148
2149 assert(link);
2150 assert(link->manager);
2151
2152 if (!link->network)
2153 return 0;
2154
2155 if (strv_isempty(link->network->bind_carrier))
2156 return 0;
2157
2158 m = link->manager;
2159
2160 HASHMAP_FOREACH (carrier, m->links, i) {
2161 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2162 r = link_put_carrier(link, carrier, &link->bound_to_links);
2163 if (r < 0)
2164 return r;
2165
2166 list_updated = true;
2167 }
2168 }
2169
2170 if (list_updated)
2171 link_dirty(link);
2172
2173 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2174 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2175 if (r < 0)
2176 return r;
2177
2178 link_dirty(carrier);
2179 }
2180
2181 return 0;
2182 }
2183
2184 static int link_new_carrier_maps(Link *link) {
2185 int r;
2186
2187 r = link_new_bound_by_list(link);
2188 if (r < 0)
2189 return r;
2190
2191 r = link_handle_bound_by_list(link);
2192 if (r < 0)
2193 return r;
2194
2195 r = link_new_bound_to_list(link);
2196 if (r < 0)
2197 return r;
2198
2199 r = link_handle_bound_to_list(link);
2200 if (r < 0)
2201 return r;
2202
2203 return 0;
2204 }
2205
2206 static void link_free_bound_to_list(Link *link) {
2207 Link *bound_to;
2208 Iterator i;
2209
2210 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2211 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2212
2213 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2214 link_dirty(bound_to);
2215 }
2216
2217 return;
2218 }
2219
2220 static void link_free_bound_by_list(Link *link) {
2221 Link *bound_by;
2222 Iterator i;
2223
2224 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2225 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2226
2227 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2228 link_dirty(bound_by);
2229 link_handle_bound_to_list(bound_by);
2230 }
2231 }
2232
2233 return;
2234 }
2235
2236 static void link_free_carrier_maps(Link *link) {
2237 bool list_updated = false;
2238
2239 assert(link);
2240
2241 if (!hashmap_isempty(link->bound_to_links)) {
2242 link_free_bound_to_list(link);
2243 list_updated = true;
2244 }
2245
2246 if (!hashmap_isempty(link->bound_by_links)) {
2247 link_free_bound_by_list(link);
2248 list_updated = true;
2249 }
2250
2251 if (list_updated)
2252 link_dirty(link);
2253
2254 return;
2255 }
2256
2257 void link_drop(Link *link) {
2258 if (!link || link->state == LINK_STATE_LINGER)
2259 return;
2260
2261 link_set_state(link, LINK_STATE_LINGER);
2262
2263 link_free_carrier_maps(link);
2264
2265 log_link_debug(link, "Link removed");
2266
2267 (void) unlink(link->state_file);
2268 link_unref(link);
2269
2270 return;
2271 }
2272
2273 static int link_joined(Link *link) {
2274 int r;
2275
2276 assert(link);
2277 assert(link->network);
2278
2279 if (!hashmap_isempty(link->bound_to_links)) {
2280 r = link_handle_bound_to_list(link);
2281 if (r < 0)
2282 return r;
2283 } else if (!(link->flags & IFF_UP)) {
2284 r = link_up(link);
2285 if (r < 0) {
2286 link_enter_failed(link);
2287 return r;
2288 }
2289 }
2290
2291 if (link->network->bridge) {
2292 r = link_set_bridge(link);
2293 if (r < 0)
2294 log_link_error_errno(link, r, "Could not set bridge message: %m");
2295 }
2296
2297 if (link->network->bond) {
2298 r = link_bond_set(link);
2299 if (r < 0)
2300 log_link_error_errno(link, r, "Could not set bond message: %m");
2301 }
2302
2303 if (link->network->use_br_vlan &&
2304 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2305 r = link_set_bridge_vlan(link);
2306 if (r < 0)
2307 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2308 }
2309
2310 /* Skip setting up addresses until it gets carrier,
2311 or it would try to set addresses twice,
2312 which is bad for non-idempotent steps. */
2313 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2314 return 0;
2315
2316 return link_enter_set_addresses(link);
2317 }
2318
2319 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
2320 _cleanup_(link_unrefp) Link *link = userdata;
2321 int r;
2322
2323 assert(link);
2324 assert(link->network);
2325
2326 link->enslaving--;
2327
2328 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2329 return 1;
2330
2331 r = sd_netlink_message_get_errno(m);
2332 if (r < 0 && r != -EEXIST) {
2333 log_link_error_errno(link, r, "Could not join netdev: %m");
2334 link_enter_failed(link);
2335 return 1;
2336 } else
2337 log_link_debug(link, "Joined netdev");
2338
2339 if (link->enslaving <= 0)
2340 link_joined(link);
2341
2342 return 1;
2343 }
2344
2345 static int link_enter_join_netdev(Link *link) {
2346 NetDev *netdev;
2347 Iterator i;
2348 int r;
2349
2350 assert(link);
2351 assert(link->network);
2352 assert(link->state == LINK_STATE_PENDING);
2353
2354 link_set_state(link, LINK_STATE_ENSLAVING);
2355
2356 link_dirty(link);
2357
2358 if (!link->network->bridge &&
2359 !link->network->bond &&
2360 !link->network->vrf &&
2361 hashmap_isempty(link->network->stacked_netdevs))
2362 return link_joined(link);
2363
2364 if (link->network->bond) {
2365 log_struct(LOG_DEBUG,
2366 LOG_LINK_INTERFACE(link),
2367 LOG_NETDEV_INTERFACE(link->network->bond),
2368 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2369
2370 r = netdev_join(link->network->bond, link, netdev_join_handler);
2371 if (r < 0) {
2372 log_struct_errno(LOG_WARNING, r,
2373 LOG_LINK_INTERFACE(link),
2374 LOG_NETDEV_INTERFACE(link->network->bond),
2375 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2376 link_enter_failed(link);
2377 return r;
2378 }
2379
2380 link->enslaving++;
2381 }
2382
2383 if (link->network->bridge) {
2384 log_struct(LOG_DEBUG,
2385 LOG_LINK_INTERFACE(link),
2386 LOG_NETDEV_INTERFACE(link->network->bridge),
2387 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2388
2389 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2390 if (r < 0) {
2391 log_struct_errno(LOG_WARNING, r,
2392 LOG_LINK_INTERFACE(link),
2393 LOG_NETDEV_INTERFACE(link->network->bridge),
2394 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2395 link_enter_failed(link);
2396 return r;
2397 }
2398
2399 link->enslaving++;
2400 }
2401
2402 if (link->network->vrf) {
2403 log_struct(LOG_DEBUG,
2404 LOG_LINK_INTERFACE(link),
2405 LOG_NETDEV_INTERFACE(link->network->vrf),
2406 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2407
2408 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2409 if (r < 0) {
2410 log_struct_errno(LOG_WARNING, r,
2411 LOG_LINK_INTERFACE(link),
2412 LOG_NETDEV_INTERFACE(link->network->vrf),
2413 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2414 link_enter_failed(link);
2415 return r;
2416 }
2417
2418 link->enslaving++;
2419 }
2420
2421 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2422
2423 if (netdev->ifindex > 0) {
2424 link_joined(link);
2425 continue;
2426 }
2427
2428 log_struct(LOG_DEBUG,
2429 LOG_LINK_INTERFACE(link),
2430 LOG_NETDEV_INTERFACE(netdev),
2431 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2432
2433 r = netdev_join(netdev, link, netdev_join_handler);
2434 if (r < 0) {
2435 log_struct_errno(LOG_WARNING, r,
2436 LOG_LINK_INTERFACE(link),
2437 LOG_NETDEV_INTERFACE(netdev),
2438 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2439 link_enter_failed(link);
2440 return r;
2441 }
2442
2443 link->enslaving++;
2444 }
2445
2446 return 0;
2447 }
2448
2449 static int link_set_ipv4_forward(Link *link) {
2450 int r;
2451
2452 if (!link_ipv4_forward_enabled(link))
2453 return 0;
2454
2455 /* We propagate the forwarding flag from one interface to the
2456 * global setting one way. This means: as long as at least one
2457 * interface was configured at any time that had IP forwarding
2458 * enabled the setting will stay on for good. We do this
2459 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2460 * somewhat in sync (see below). */
2461
2462 r = write_string_file("/proc/sys/net/ipv4/ip_forward", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2463 if (r < 0)
2464 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2465
2466 return 0;
2467 }
2468
2469 static int link_set_ipv6_forward(Link *link) {
2470 int r;
2471
2472 if (!link_ipv6_forward_enabled(link))
2473 return 0;
2474
2475 /* On Linux, the IPv6 stack does not know a per-interface
2476 * packet forwarding setting: either packet forwarding is on
2477 * for all, or off for all. We hence don't bother with a
2478 * per-interface setting, but simply propagate the interface
2479 * flag, if it is set, to the global flag, one-way. Note that
2480 * while IPv4 would allow a per-interface flag, we expose the
2481 * same behaviour there and also propagate the setting from
2482 * one to all, to keep things simple (see above). */
2483
2484 r = write_string_file("/proc/sys/net/ipv6/conf/all/forwarding", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2485 if (r < 0)
2486 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2487
2488 return 0;
2489 }
2490
2491 static int link_set_ipv6_privacy_extensions(Link *link) {
2492 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2493 IPv6PrivacyExtensions s;
2494 const char *p = NULL;
2495 int r;
2496
2497 s = link_ipv6_privacy_extensions(link);
2498 if (s < 0)
2499 return 0;
2500
2501 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/use_tempaddr");
2502 xsprintf(buf, "%u", (unsigned) link->network->ipv6_privacy_extensions);
2503
2504 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2505 if (r < 0)
2506 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2507
2508 return 0;
2509 }
2510
2511 static int link_set_ipv6_accept_ra(Link *link) {
2512 const char *p = NULL;
2513 int r;
2514
2515 /* Make this a NOP if IPv6 is not available */
2516 if (!socket_ipv6_is_supported())
2517 return 0;
2518
2519 if (link->flags & IFF_LOOPBACK)
2520 return 0;
2521
2522 if (!link->network)
2523 return 0;
2524
2525 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/accept_ra");
2526
2527 /* We handle router advertisements ourselves, tell the kernel to GTFO */
2528 r = write_string_file(p, "0", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2529 if (r < 0)
2530 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2531
2532 return 0;
2533 }
2534
2535 static int link_set_ipv6_dad_transmits(Link *link) {
2536 char buf[DECIMAL_STR_MAX(int) + 1];
2537 const char *p = NULL;
2538 int r;
2539
2540 /* Make this a NOP if IPv6 is not available */
2541 if (!socket_ipv6_is_supported())
2542 return 0;
2543
2544 if (link->flags & IFF_LOOPBACK)
2545 return 0;
2546
2547 if (!link->network)
2548 return 0;
2549
2550 if (link->network->ipv6_dad_transmits < 0)
2551 return 0;
2552
2553 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/dad_transmits");
2554 xsprintf(buf, "%i", link->network->ipv6_dad_transmits);
2555
2556 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2557 if (r < 0)
2558 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2559
2560 return 0;
2561 }
2562
2563 static int link_set_ipv6_hop_limit(Link *link) {
2564 char buf[DECIMAL_STR_MAX(int) + 1];
2565 const char *p = NULL;
2566 int r;
2567
2568 /* Make this a NOP if IPv6 is not available */
2569 if (!socket_ipv6_is_supported())
2570 return 0;
2571
2572 if (link->flags & IFF_LOOPBACK)
2573 return 0;
2574
2575 if (!link->network)
2576 return 0;
2577
2578 if (link->network->ipv6_hop_limit < 0)
2579 return 0;
2580
2581 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/hop_limit");
2582 xsprintf(buf, "%i", link->network->ipv6_hop_limit);
2583
2584 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2585 if (r < 0)
2586 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2587
2588 return 0;
2589 }
2590
2591 static int link_set_ipv6_mtu(Link *link) {
2592 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2593 const char *p = NULL;
2594 int r;
2595
2596 /* Make this a NOP if IPv6 is not available */
2597 if (!socket_ipv6_is_supported())
2598 return 0;
2599
2600 if (link->flags & IFF_LOOPBACK)
2601 return 0;
2602
2603 if (link->network->ipv6_mtu == 0)
2604 return 0;
2605
2606 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/mtu");
2607
2608 xsprintf(buf, "%" PRIu32, link->network->ipv6_mtu);
2609
2610 r = write_string_file(p, buf, 0);
2611 if (r < 0)
2612 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2613
2614 return 0;
2615 }
2616
2617 static int link_drop_foreign_config(Link *link) {
2618 Address *address;
2619 Route *route;
2620 Iterator i;
2621 int r;
2622
2623 SET_FOREACH(address, link->addresses_foreign, i) {
2624 /* we consider IPv6LL addresses to be managed by the kernel */
2625 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2626 continue;
2627
2628 r = address_remove(address, link, link_address_remove_handler);
2629 if (r < 0)
2630 return r;
2631 }
2632
2633 SET_FOREACH(route, link->routes_foreign, i) {
2634 /* do not touch routes managed by the kernel */
2635 if (route->protocol == RTPROT_KERNEL)
2636 continue;
2637
2638 r = route_remove(route, link, link_route_remove_handler);
2639 if (r < 0)
2640 return r;
2641 }
2642
2643 return 0;
2644 }
2645
2646 static int link_drop_config(Link *link) {
2647 Address *address, *pool_address;
2648 Route *route;
2649 Iterator i;
2650 int r;
2651
2652 SET_FOREACH(address, link->addresses, i) {
2653 /* we consider IPv6LL addresses to be managed by the kernel */
2654 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2655 continue;
2656
2657 r = address_remove(address, link, link_address_remove_handler);
2658 if (r < 0)
2659 return r;
2660
2661 /* If this address came from an address pool, clean up the pool */
2662 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2663 if (address_equal(address, pool_address)) {
2664 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2665 address_free(pool_address);
2666 break;
2667 }
2668 }
2669 }
2670
2671 SET_FOREACH(route, link->routes, i) {
2672 /* do not touch routes managed by the kernel */
2673 if (route->protocol == RTPROT_KERNEL)
2674 continue;
2675
2676 r = route_remove(route, link, link_route_remove_handler);
2677 if (r < 0)
2678 return r;
2679 }
2680
2681 ndisc_flush(link);
2682
2683 return 0;
2684 }
2685
2686 static int link_update_lldp(Link *link) {
2687 int r;
2688
2689 assert(link);
2690
2691 if (!link->lldp)
2692 return 0;
2693
2694 if (link->flags & IFF_UP) {
2695 r = sd_lldp_start(link->lldp);
2696 if (r > 0)
2697 log_link_debug(link, "Started LLDP.");
2698 } else {
2699 r = sd_lldp_stop(link->lldp);
2700 if (r > 0)
2701 log_link_debug(link, "Stopped LLDP.");
2702 }
2703
2704 return r;
2705 }
2706
2707 static int link_configure_can(Link *link) {
2708 int r;
2709
2710 if (streq_ptr(link->kind, "can")) {
2711 /* The CAN interface must be down to configure bitrate, etc... */
2712 if ((link->flags & IFF_UP)) {
2713 r = link_down(link);
2714 if (r < 0) {
2715 link_enter_failed(link);
2716 return r;
2717 }
2718
2719 return 0;
2720 }
2721
2722 return link_set_can(link);
2723 }
2724
2725 if (!(link->flags & IFF_UP)) {
2726 r = link_up_can(link);
2727 if (r < 0) {
2728 link_enter_failed(link);
2729 return r;
2730 }
2731 }
2732
2733 return 0;
2734 }
2735
2736 static int link_configure(Link *link) {
2737 int r;
2738
2739 assert(link);
2740 assert(link->network);
2741 assert(link->state == LINK_STATE_PENDING);
2742
2743 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
2744 return link_configure_can(link);
2745
2746 /* Drop foreign config, but ignore loopback or critical devices.
2747 * We do not want to remove loopback address or addresses used for root NFS. */
2748 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2749 r = link_drop_foreign_config(link);
2750 if (r < 0)
2751 return r;
2752 }
2753
2754 r = link_set_proxy_arp(link);
2755 if (r < 0)
2756 return r;
2757
2758 r = ipv6_proxy_ndp_addresses_configure(link);
2759 if (r < 0)
2760 return r;
2761
2762 r = link_set_ipv4_forward(link);
2763 if (r < 0)
2764 return r;
2765
2766 r = link_set_ipv6_forward(link);
2767 if (r < 0)
2768 return r;
2769
2770 r = link_set_ipv6_privacy_extensions(link);
2771 if (r < 0)
2772 return r;
2773
2774 r = link_set_ipv6_accept_ra(link);
2775 if (r < 0)
2776 return r;
2777
2778 r = link_set_ipv6_dad_transmits(link);
2779 if (r < 0)
2780 return r;
2781
2782 r = link_set_ipv6_hop_limit(link);
2783 if (r < 0)
2784 return r;
2785
2786 r = link_set_flags(link);
2787 if (r < 0)
2788 return r;
2789
2790 r = link_set_ipv6_mtu(link);
2791 if (r < 0)
2792 return r;
2793
2794 if (link_ipv4ll_enabled(link)) {
2795 r = ipv4ll_configure(link);
2796 if (r < 0)
2797 return r;
2798 }
2799
2800 if (link_dhcp4_enabled(link)) {
2801 r = dhcp4_set_promote_secondaries(link);
2802 if (r < 0)
2803 return r;
2804
2805 r = dhcp4_configure(link);
2806 if (r < 0)
2807 return r;
2808 }
2809
2810 if (link_dhcp4_server_enabled(link)) {
2811 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2812 if (r < 0)
2813 return r;
2814
2815 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2816 if (r < 0)
2817 return r;
2818 }
2819
2820 if (link_dhcp6_enabled(link) ||
2821 link_ipv6_accept_ra_enabled(link)) {
2822 r = dhcp6_configure(link);
2823 if (r < 0)
2824 return r;
2825 }
2826
2827 if (link_ipv6_accept_ra_enabled(link)) {
2828 r = ndisc_configure(link);
2829 if (r < 0)
2830 return r;
2831 }
2832
2833 if (link_radv_enabled(link)) {
2834 r = radv_configure(link);
2835 if (r < 0)
2836 return r;
2837 }
2838
2839 if (link_lldp_rx_enabled(link)) {
2840 r = sd_lldp_new(&link->lldp);
2841 if (r < 0)
2842 return r;
2843
2844 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
2845 if (r < 0)
2846 return r;
2847
2848 r = sd_lldp_match_capabilities(link->lldp,
2849 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
2850 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
2851 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
2852 if (r < 0)
2853 return r;
2854
2855 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
2856 if (r < 0)
2857 return r;
2858
2859 r = sd_lldp_attach_event(link->lldp, NULL, 0);
2860 if (r < 0)
2861 return r;
2862
2863 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
2864 if (r < 0)
2865 return r;
2866
2867 r = link_update_lldp(link);
2868 if (r < 0)
2869 return r;
2870 }
2871
2872 if (link->network->mtu > 0) {
2873 r = link_set_mtu(link, link->network->mtu);
2874 if (r < 0)
2875 return r;
2876 }
2877
2878 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2879 r = link_acquire_conf(link);
2880 if (r < 0)
2881 return r;
2882 }
2883
2884 return link_enter_join_netdev(link);
2885 }
2886
2887 static int link_initialized_and_synced(sd_netlink *rtnl, sd_netlink_message *m,
2888 void *userdata) {
2889 _cleanup_(link_unrefp) Link *link = userdata;
2890 Network *network;
2891 int r;
2892
2893 assert(link);
2894 assert(link->ifname);
2895 assert(link->manager);
2896
2897 if (link->state != LINK_STATE_PENDING)
2898 return 1;
2899
2900 log_link_debug(link, "Link state is up-to-date");
2901
2902 r = link_new_bound_by_list(link);
2903 if (r < 0)
2904 return r;
2905
2906 r = link_handle_bound_by_list(link);
2907 if (r < 0)
2908 return r;
2909
2910 if (!link->network) {
2911 r = network_get(link->manager, link->udev_device, link->ifname,
2912 &link->mac, &network);
2913 if (r == -ENOENT) {
2914 link_enter_unmanaged(link);
2915 return 1;
2916 } else if (r == 0 && network->unmanaged) {
2917 link_enter_unmanaged(link);
2918 return 0;
2919 } else if (r < 0)
2920 return r;
2921
2922 if (link->flags & IFF_LOOPBACK) {
2923 if (network->link_local != ADDRESS_FAMILY_NO)
2924 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2925
2926 if (network->dhcp != ADDRESS_FAMILY_NO)
2927 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2928
2929 if (network->dhcp_server)
2930 log_link_debug(link, "Ignoring DHCP server for loopback link");
2931 }
2932
2933 r = network_apply(network, link);
2934 if (r < 0)
2935 return r;
2936 }
2937
2938 r = link_new_bound_to_list(link);
2939 if (r < 0)
2940 return r;
2941
2942 r = link_configure(link);
2943 if (r < 0)
2944 return r;
2945
2946 return 1;
2947 }
2948
2949 int link_initialized(Link *link, struct udev_device *device) {
2950 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2951 int r;
2952
2953 assert(link);
2954 assert(link->manager);
2955 assert(link->manager->rtnl);
2956 assert(device);
2957
2958 if (link->state != LINK_STATE_PENDING)
2959 return 0;
2960
2961 if (link->udev_device)
2962 return 0;
2963
2964 log_link_debug(link, "udev initialized link");
2965
2966 link->udev_device = udev_device_ref(device);
2967
2968 /* udev has initialized the link, but we don't know if we have yet
2969 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2970 * when it returns we know that the pending NEWLINKs have already been
2971 * processed and that we are up-to-date */
2972
2973 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2974 link->ifindex);
2975 if (r < 0)
2976 return r;
2977
2978 r = sd_netlink_call_async(link->manager->rtnl, req,
2979 link_initialized_and_synced, link, 0, NULL);
2980 if (r < 0)
2981 return r;
2982
2983 link_ref(link);
2984
2985 return 0;
2986 }
2987
2988 static int link_load(Link *link) {
2989 _cleanup_free_ char *network_file = NULL,
2990 *addresses = NULL,
2991 *routes = NULL,
2992 *dhcp4_address = NULL,
2993 *ipv4ll_address = NULL;
2994 union in_addr_union address;
2995 union in_addr_union route_dst;
2996 const char *p;
2997 int r;
2998
2999 assert(link);
3000
3001 r = parse_env_file(NULL, link->state_file, NEWLINE,
3002 "NETWORK_FILE", &network_file,
3003 "ADDRESSES", &addresses,
3004 "ROUTES", &routes,
3005 "DHCP4_ADDRESS", &dhcp4_address,
3006 "IPV4LL_ADDRESS", &ipv4ll_address,
3007 NULL);
3008 if (r < 0 && r != -ENOENT)
3009 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3010
3011 if (network_file) {
3012 Network *network;
3013 char *suffix;
3014
3015 /* drop suffix */
3016 suffix = strrchr(network_file, '.');
3017 if (!suffix) {
3018 log_link_debug(link, "Failed to get network name from %s", network_file);
3019 goto network_file_fail;
3020 }
3021 *suffix = '\0';
3022
3023 r = network_get_by_name(link->manager, basename(network_file), &network);
3024 if (r < 0) {
3025 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3026 goto network_file_fail;
3027 }
3028
3029 r = network_apply(network, link);
3030 if (r < 0)
3031 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3032 }
3033
3034 network_file_fail:
3035
3036 if (addresses) {
3037 p = addresses;
3038
3039 for (;;) {
3040 _cleanup_free_ char *address_str = NULL;
3041 char *prefixlen_str;
3042 int family;
3043 unsigned char prefixlen;
3044
3045 r = extract_first_word(&p, &address_str, NULL, 0);
3046 if (r < 0) {
3047 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3048 continue;
3049 }
3050 if (r == 0)
3051 break;
3052
3053 prefixlen_str = strchr(address_str, '/');
3054 if (!prefixlen_str) {
3055 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3056 continue;
3057 }
3058
3059 *prefixlen_str++ = '\0';
3060
3061 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3062 if (r != 1) {
3063 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3064 continue;
3065 }
3066
3067 r = in_addr_from_string_auto(address_str, &family, &address);
3068 if (r < 0) {
3069 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3070 continue;
3071 }
3072
3073 r = address_add(link, family, &address, prefixlen, NULL);
3074 if (r < 0)
3075 return log_link_error_errno(link, r, "Failed to add address: %m");
3076 }
3077 }
3078
3079 if (routes) {
3080 p = routes;
3081
3082 for (;;) {
3083 Route *route;
3084 _cleanup_free_ char *route_str = NULL;
3085 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3086 usec_t lifetime;
3087 char *prefixlen_str;
3088 int family;
3089 unsigned char prefixlen, tos, table;
3090 uint32_t priority;
3091
3092 r = extract_first_word(&p, &route_str, NULL, 0);
3093 if (r < 0) {
3094 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3095 continue;
3096 }
3097 if (r == 0)
3098 break;
3099
3100 prefixlen_str = strchr(route_str, '/');
3101 if (!prefixlen_str) {
3102 log_link_debug(link, "Failed to parse route %s", route_str);
3103 continue;
3104 }
3105
3106 *prefixlen_str++ = '\0';
3107
3108 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3109 if (r != 5) {
3110 log_link_debug(link,
3111 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3112 prefixlen_str);
3113 continue;
3114 }
3115
3116 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3117 if (r < 0) {
3118 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3119 continue;
3120 }
3121
3122 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3123 if (r < 0)
3124 return log_link_error_errno(link, r, "Failed to add route: %m");
3125
3126 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3127 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3128 0, route_expire_handler, route);
3129 if (r < 0)
3130 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3131 }
3132
3133 route->lifetime = lifetime;
3134 sd_event_source_unref(route->expire);
3135 route->expire = TAKE_PTR(expire);
3136 }
3137 }
3138
3139 if (dhcp4_address) {
3140 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3141 if (r < 0) {
3142 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3143 goto dhcp4_address_fail;
3144 }
3145
3146 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3147 if (r < 0)
3148 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3149
3150 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3151 if (r < 0)
3152 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3153 }
3154
3155 dhcp4_address_fail:
3156
3157 if (ipv4ll_address) {
3158 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3159 if (r < 0) {
3160 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3161 goto ipv4ll_address_fail;
3162 }
3163
3164 r = sd_ipv4ll_new(&link->ipv4ll);
3165 if (r < 0)
3166 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3167
3168 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3169 if (r < 0)
3170 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3171 }
3172
3173 ipv4ll_address_fail:
3174
3175 return 0;
3176 }
3177
3178 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3179 Link *link;
3180 _cleanup_(udev_device_unrefp) struct udev_device *device = NULL;
3181 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3182 int r;
3183
3184 assert(m);
3185 assert(m->rtnl);
3186 assert(message);
3187 assert(ret);
3188
3189 r = link_new(m, message, ret);
3190 if (r < 0)
3191 return r;
3192
3193 link = *ret;
3194
3195 log_link_debug(link, "Link %d added", link->ifindex);
3196
3197 r = link_load(link);
3198 if (r < 0)
3199 return r;
3200
3201 if (detect_container() <= 0) {
3202 /* not in a container, udev will be around */
3203 sprintf(ifindex_str, "n%d", link->ifindex);
3204 device = udev_device_new_from_device_id(m->udev, ifindex_str);
3205 if (!device) {
3206 r = log_link_warning_errno(link, errno, "Could not find udev device: %m");
3207 goto failed;
3208 }
3209
3210 if (udev_device_get_is_initialized(device) <= 0) {
3211 /* not yet ready */
3212 log_link_debug(link, "link pending udev initialization...");
3213 return 0;
3214 }
3215
3216 r = link_initialized(link, device);
3217 if (r < 0)
3218 goto failed;
3219 } else {
3220 /* we are calling a callback directly, so must take a ref */
3221 link_ref(link);
3222
3223 r = link_initialized_and_synced(m->rtnl, NULL, link);
3224 if (r < 0)
3225 goto failed;
3226 }
3227
3228 return 0;
3229 failed:
3230 link_enter_failed(link);
3231 return r;
3232 }
3233
3234 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3235 int r;
3236
3237 assert(link);
3238
3239 log_link_info(link, "Gained IPv6LL");
3240
3241 link->ipv6ll_address = *address;
3242 link_check_ready(link);
3243
3244 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3245 r = link_acquire_ipv6_conf(link);
3246 if (r < 0) {
3247 link_enter_failed(link);
3248 return r;
3249 }
3250 }
3251
3252 return 0;
3253 }
3254
3255 static int link_carrier_gained(Link *link) {
3256 int r;
3257
3258 assert(link);
3259
3260 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3261 r = link_acquire_conf(link);
3262 if (r < 0) {
3263 link_enter_failed(link);
3264 return r;
3265 }
3266
3267 r = link_enter_set_addresses(link);
3268 if (r < 0)
3269 return r;
3270 }
3271
3272 r = link_handle_bound_by_list(link);
3273 if (r < 0)
3274 return r;
3275
3276 return 0;
3277 }
3278
3279 static int link_carrier_lost(Link *link) {
3280 int r;
3281
3282 assert(link);
3283
3284 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3285 setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3286 configuration and stop the clients as well. */
3287 if (link->setting_mtu)
3288 return 0;
3289
3290 r = link_stop_clients(link);
3291 if (r < 0) {
3292 link_enter_failed(link);
3293 return r;
3294 }
3295
3296 if (link_dhcp4_server_enabled(link))
3297 (void) sd_dhcp_server_stop(link->dhcp_server);
3298
3299 r = link_drop_config(link);
3300 if (r < 0)
3301 return r;
3302
3303 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3304 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3305 r = link_drop_foreign_config(link);
3306 if (r < 0)
3307 return r;
3308 }
3309
3310 r = link_handle_bound_by_list(link);
3311 if (r < 0)
3312 return r;
3313
3314 return 0;
3315 }
3316
3317 int link_carrier_reset(Link *link) {
3318 int r;
3319
3320 assert(link);
3321
3322 if (link_has_carrier(link)) {
3323 r = link_carrier_lost(link);
3324 if (r < 0)
3325 return r;
3326
3327 r = link_carrier_gained(link);
3328 if (r < 0)
3329 return r;
3330
3331 log_link_info(link, "Reset carrier");
3332 }
3333
3334 return 0;
3335 }
3336
3337 int link_update(Link *link, sd_netlink_message *m) {
3338 struct ether_addr mac;
3339 const char *ifname;
3340 uint32_t mtu;
3341 bool had_carrier, carrier_gained, carrier_lost;
3342 int r;
3343
3344 assert(link);
3345 assert(link->ifname);
3346 assert(m);
3347
3348 if (link->state == LINK_STATE_LINGER) {
3349 link_ref(link);
3350 log_link_info(link, "Link readded");
3351 link_set_state(link, LINK_STATE_ENSLAVING);
3352
3353 r = link_new_carrier_maps(link);
3354 if (r < 0)
3355 return r;
3356 }
3357
3358 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3359 if (r >= 0 && !streq(ifname, link->ifname)) {
3360 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3361
3362 if (link->state == LINK_STATE_PENDING) {
3363 r = free_and_strdup(&link->ifname, ifname);
3364 if (r < 0)
3365 return r;
3366 } else {
3367 Manager *manager = link->manager;
3368
3369 link_drop(link);
3370 r = link_add(manager, m, &link);
3371 if (r < 0)
3372 return r;
3373 }
3374 }
3375
3376 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3377 if (r >= 0 && mtu > 0) {
3378 link->mtu = mtu;
3379 if (link->original_mtu == 0) {
3380 link->original_mtu = mtu;
3381 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3382 }
3383
3384 if (link->dhcp_client) {
3385 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3386 link->mtu);
3387 if (r < 0)
3388 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3389 }
3390
3391 if (link->radv) {
3392 r = sd_radv_set_mtu(link->radv, link->mtu);
3393 if (r < 0)
3394 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3395 }
3396 }
3397
3398 /* The kernel may broadcast NEWLINK messages without the MAC address
3399 set, simply ignore them. */
3400 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3401 if (r >= 0) {
3402 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3403 ETH_ALEN)) {
3404
3405 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3406 ETH_ALEN);
3407
3408 log_link_debug(link, "MAC address: "
3409 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3410 mac.ether_addr_octet[0],
3411 mac.ether_addr_octet[1],
3412 mac.ether_addr_octet[2],
3413 mac.ether_addr_octet[3],
3414 mac.ether_addr_octet[4],
3415 mac.ether_addr_octet[5]);
3416
3417 if (link->ipv4ll) {
3418 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3419 if (r < 0)
3420 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3421 }
3422
3423 if (link->dhcp_client) {
3424 r = sd_dhcp_client_set_mac(link->dhcp_client,
3425 (const uint8_t *) &link->mac,
3426 sizeof (link->mac),
3427 ARPHRD_ETHER);
3428 if (r < 0)
3429 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3430
3431 switch (link->network->dhcp_client_identifier) {
3432 case DHCP_CLIENT_ID_DUID: {
3433 const DUID *duid = link_duid(link);
3434
3435 r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
3436 link->network->iaid,
3437 duid->type,
3438 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3439 duid->raw_data_len);
3440 if (r < 0)
3441 return log_link_warning_errno(link, r, "Could not update DUID/IAID in DHCP client: %m");
3442 break;
3443 }
3444 case DHCP_CLIENT_ID_DUID_ONLY: {
3445 const DUID *duid = link_duid(link);
3446
3447 r = sd_dhcp_client_set_duid(link->dhcp_client,
3448 duid->type,
3449 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3450 duid->raw_data_len);
3451 if (r < 0)
3452 return log_link_warning_errno(link, r, "Could not update DUID in DHCP client: %m");
3453 break;
3454 }
3455 case DHCP_CLIENT_ID_MAC:
3456 r = sd_dhcp_client_set_client_id(link->dhcp_client,
3457 ARPHRD_ETHER,
3458 (const uint8_t *)&link->mac,
3459 sizeof(link->mac));
3460 if (r < 0)
3461 return log_link_warning_errno(link, r, "Could not update MAC client id in DHCP client: %m");
3462 break;
3463 default:
3464 assert_not_reached("Unknown client identifier type.");
3465 }
3466 }
3467
3468 if (link->dhcp6_client) {
3469 const DUID* duid = link_duid(link);
3470
3471 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3472 (const uint8_t *) &link->mac,
3473 sizeof (link->mac),
3474 ARPHRD_ETHER);
3475 if (r < 0)
3476 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3477
3478 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3479 link->network->iaid);
3480 if (r < 0)
3481 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3482
3483 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3484 duid->type,
3485 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3486 duid->raw_data_len);
3487 if (r < 0)
3488 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3489 }
3490
3491 if (link->radv) {
3492 r = sd_radv_set_mac(link->radv, &link->mac);
3493 if (r < 0)
3494 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3495 }
3496
3497 if (link->ndisc) {
3498 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3499 if (r < 0)
3500 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3501 }
3502 }
3503 }
3504
3505 had_carrier = link_has_carrier(link);
3506
3507 r = link_update_flags(link, m);
3508 if (r < 0)
3509 return r;
3510
3511 r = link_update_lldp(link);
3512 if (r < 0)
3513 return r;
3514
3515 carrier_gained = !had_carrier && link_has_carrier(link);
3516 carrier_lost = had_carrier && !link_has_carrier(link);
3517
3518 if (carrier_gained) {
3519 log_link_info(link, "Gained carrier");
3520
3521 r = link_carrier_gained(link);
3522 if (r < 0)
3523 return r;
3524 } else if (carrier_lost) {
3525 log_link_info(link, "Lost carrier");
3526
3527 r = link_carrier_lost(link);
3528 if (r < 0)
3529 return r;
3530 }
3531
3532 return 0;
3533 }
3534
3535 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3536 bool space = false;
3537 Iterator i;
3538 Link *link;
3539
3540 assert(f);
3541 assert(prefix);
3542
3543 if (hashmap_isempty(h))
3544 return;
3545
3546 fputs(prefix, f);
3547 HASHMAP_FOREACH(link, h, i) {
3548 if (space)
3549 fputc(' ', f);
3550
3551 fprintf(f, "%i", link->ifindex);
3552 space = true;
3553 }
3554
3555 fputc('\n', f);
3556 }
3557
3558 int link_save(Link *link) {
3559 _cleanup_free_ char *temp_path = NULL;
3560 _cleanup_fclose_ FILE *f = NULL;
3561 const char *admin_state, *oper_state;
3562 Address *a;
3563 Route *route;
3564 Iterator i;
3565 int r;
3566
3567 assert(link);
3568 assert(link->state_file);
3569 assert(link->lease_file);
3570 assert(link->manager);
3571
3572 if (link->state == LINK_STATE_LINGER) {
3573 unlink(link->state_file);
3574 return 0;
3575 }
3576
3577 link_lldp_save(link);
3578
3579 admin_state = link_state_to_string(link->state);
3580 assert(admin_state);
3581
3582 oper_state = link_operstate_to_string(link->operstate);
3583 assert(oper_state);
3584
3585 r = fopen_temporary(link->state_file, &f, &temp_path);
3586 if (r < 0)
3587 goto fail;
3588
3589 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
3590 (void) fchmod(fileno(f), 0644);
3591
3592 fprintf(f,
3593 "# This is private data. Do not parse.\n"
3594 "ADMIN_STATE=%s\n"
3595 "OPER_STATE=%s\n",
3596 admin_state, oper_state);
3597
3598 if (link->network) {
3599 bool space;
3600 sd_dhcp6_lease *dhcp6_lease = NULL;
3601 const char *dhcp_domainname = NULL;
3602 char **dhcp6_domains = NULL;
3603 char **dhcp_domains = NULL;
3604 unsigned j;
3605
3606 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3607 yes_no(link->network->required_for_online));
3608
3609 if (link->dhcp6_client) {
3610 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3611 if (r < 0 && r != -ENOMSG)
3612 log_link_debug(link, "No DHCPv6 lease");
3613 }
3614
3615 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3616
3617 fputs("DNS=", f);
3618 space = false;
3619
3620 for (j = 0; j < link->network->n_dns; j++) {
3621 _cleanup_free_ char *b = NULL;
3622
3623 r = in_addr_to_string(link->network->dns[j].family,
3624 &link->network->dns[j].address, &b);
3625 if (r < 0) {
3626 log_debug_errno(r, "Failed to format address, ignoring: %m");
3627 continue;
3628 }
3629
3630 if (space)
3631 fputc(' ', f);
3632 fputs(b, f);
3633 space = true;
3634 }
3635
3636 if (link->network->dhcp_use_dns &&
3637 link->dhcp_lease) {
3638 const struct in_addr *addresses;
3639
3640 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3641 if (r > 0) {
3642 if (space)
3643 fputc(' ', f);
3644 serialize_in_addrs(f, addresses, r);
3645 space = true;
3646 }
3647 }
3648
3649 if (link->network->dhcp_use_dns && dhcp6_lease) {
3650 struct in6_addr *in6_addrs;
3651
3652 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3653 if (r > 0) {
3654 if (space)
3655 fputc(' ', f);
3656 serialize_in6_addrs(f, in6_addrs, r);
3657 space = true;
3658 }
3659 }
3660
3661 /* Make sure to flush out old entries before we use the NDISC data */
3662 ndisc_vacuum(link);
3663
3664 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3665 NDiscRDNSS *dd;
3666
3667 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3668 if (space)
3669 fputc(' ', f);
3670
3671 serialize_in6_addrs(f, &dd->address, 1);
3672 space = true;
3673 }
3674 }
3675
3676 fputc('\n', f);
3677
3678 fputs("NTP=", f);
3679 space = false;
3680 fputstrv(f, link->network->ntp, NULL, &space);
3681
3682 if (link->network->dhcp_use_ntp &&
3683 link->dhcp_lease) {
3684 const struct in_addr *addresses;
3685
3686 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3687 if (r > 0) {
3688 if (space)
3689 fputc(' ', f);
3690 serialize_in_addrs(f, addresses, r);
3691 space = true;
3692 }
3693 }
3694
3695 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3696 struct in6_addr *in6_addrs;
3697 char **hosts;
3698
3699 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3700 &in6_addrs);
3701 if (r > 0) {
3702 if (space)
3703 fputc(' ', f);
3704 serialize_in6_addrs(f, in6_addrs, r);
3705 space = true;
3706 }
3707
3708 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3709 if (r > 0)
3710 fputstrv(f, hosts, NULL, &space);
3711 }
3712
3713 fputc('\n', f);
3714
3715 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3716 if (link->dhcp_lease) {
3717 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3718 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3719 }
3720 if (dhcp6_lease)
3721 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3722 }
3723
3724 fputs("DOMAINS=", f);
3725 space = false;
3726 fputstrv(f, link->network->search_domains, NULL, &space);
3727
3728 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3729 NDiscDNSSL *dd;
3730
3731 if (dhcp_domainname)
3732 fputs_with_space(f, dhcp_domainname, NULL, &space);
3733 if (dhcp_domains)
3734 fputstrv(f, dhcp_domains, NULL, &space);
3735 if (dhcp6_domains)
3736 fputstrv(f, dhcp6_domains, NULL, &space);
3737
3738 SET_FOREACH(dd, link->ndisc_dnssl, i)
3739 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3740 }
3741
3742 fputc('\n', f);
3743
3744 fputs("ROUTE_DOMAINS=", f);
3745 space = false;
3746 fputstrv(f, link->network->route_domains, NULL, &space);
3747
3748 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3749 NDiscDNSSL *dd;
3750
3751 if (dhcp_domainname)
3752 fputs_with_space(f, dhcp_domainname, NULL, &space);
3753 if (dhcp_domains)
3754 fputstrv(f, dhcp_domains, NULL, &space);
3755 if (dhcp6_domains)
3756 fputstrv(f, dhcp6_domains, NULL, &space);
3757
3758 SET_FOREACH(dd, link->ndisc_dnssl, i)
3759 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3760 }
3761
3762 fputc('\n', f);
3763
3764 fprintf(f, "LLMNR=%s\n",
3765 resolve_support_to_string(link->network->llmnr));
3766 fprintf(f, "MDNS=%s\n",
3767 resolve_support_to_string(link->network->mdns));
3768
3769 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3770 fprintf(f, "DNS_OVER_TLS=%s\n",
3771 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
3772
3773 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3774 fprintf(f, "DNSSEC=%s\n",
3775 dnssec_mode_to_string(link->network->dnssec_mode));
3776
3777 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3778 const char *n;
3779
3780 fputs("DNSSEC_NTA=", f);
3781 space = false;
3782 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3783 fputs_with_space(f, n, NULL, &space);
3784 fputc('\n', f);
3785 }
3786
3787 fputs("ADDRESSES=", f);
3788 space = false;
3789 SET_FOREACH(a, link->addresses, i) {
3790 _cleanup_free_ char *address_str = NULL;
3791
3792 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3793 if (r < 0)
3794 goto fail;
3795
3796 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3797 space = true;
3798 }
3799 fputc('\n', f);
3800
3801 fputs("ROUTES=", f);
3802 space = false;
3803 SET_FOREACH(route, link->routes, i) {
3804 _cleanup_free_ char *route_str = NULL;
3805
3806 r = in_addr_to_string(route->family, &route->dst, &route_str);
3807 if (r < 0)
3808 goto fail;
3809
3810 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
3811 space ? " " : "", route_str,
3812 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3813 space = true;
3814 }
3815
3816 fputc('\n', f);
3817 }
3818
3819 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3820 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3821
3822 if (link->dhcp_lease) {
3823 struct in_addr address;
3824 const char *tz = NULL;
3825
3826 assert(link->network);
3827
3828 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3829 if (r >= 0)
3830 fprintf(f, "TIMEZONE=%s\n", tz);
3831
3832 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3833 if (r >= 0) {
3834 fputs("DHCP4_ADDRESS=", f);
3835 serialize_in_addrs(f, &address, 1);
3836 fputc('\n', f);
3837 }
3838
3839 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3840 if (r < 0)
3841 goto fail;
3842
3843 fprintf(f,
3844 "DHCP_LEASE=%s\n",
3845 link->lease_file);
3846 } else
3847 unlink(link->lease_file);
3848
3849 if (link->ipv4ll) {
3850 struct in_addr address;
3851
3852 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3853 if (r >= 0) {
3854 fputs("IPV4LL_ADDRESS=", f);
3855 serialize_in_addrs(f, &address, 1);
3856 fputc('\n', f);
3857 }
3858 }
3859
3860 r = fflush_and_check(f);
3861 if (r < 0)
3862 goto fail;
3863
3864 if (rename(temp_path, link->state_file) < 0) {
3865 r = -errno;
3866 goto fail;
3867 }
3868
3869 return 0;
3870
3871 fail:
3872 (void) unlink(link->state_file);
3873 if (temp_path)
3874 (void) unlink(temp_path);
3875
3876 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3877 }
3878
3879 /* The serialized state in /run is no longer up-to-date. */
3880 void link_dirty(Link *link) {
3881 int r;
3882
3883 assert(link);
3884
3885 /* mark manager dirty as link is dirty */
3886 manager_dirty(link->manager);
3887
3888 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3889 if (r < 0)
3890 /* allocation errors are ignored */
3891 return;
3892
3893 r = set_put(link->manager->dirty_links, link);
3894 if (r <= 0)
3895 /* don't take another ref if the link was already dirty */
3896 return;
3897
3898 link_ref(link);
3899 }
3900
3901 /* The serialized state in /run is up-to-date */
3902 void link_clean(Link *link) {
3903 assert(link);
3904 assert(link->manager);
3905
3906 set_remove(link->manager->dirty_links, link);
3907 link_unref(link);
3908 }
3909
3910 static const char* const link_state_table[_LINK_STATE_MAX] = {
3911 [LINK_STATE_PENDING] = "pending",
3912 [LINK_STATE_ENSLAVING] = "configuring",
3913 [LINK_STATE_SETTING_ADDRESSES] = "configuring",
3914 [LINK_STATE_SETTING_ROUTES] = "configuring",
3915 [LINK_STATE_CONFIGURED] = "configured",
3916 [LINK_STATE_UNMANAGED] = "unmanaged",
3917 [LINK_STATE_FAILED] = "failed",
3918 [LINK_STATE_LINGER] = "linger",
3919 };
3920
3921 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
3922
3923 static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
3924 [LINK_OPERSTATE_OFF] = "off",
3925 [LINK_OPERSTATE_NO_CARRIER] = "no-carrier",
3926 [LINK_OPERSTATE_DORMANT] = "dormant",
3927 [LINK_OPERSTATE_CARRIER] = "carrier",
3928 [LINK_OPERSTATE_DEGRADED] = "degraded",
3929 [LINK_OPERSTATE_ROUTABLE] = "routable",
3930 };
3931
3932 DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
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