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network: recreate link if its interface name is changed (#8795)
[thirdparty/systemd.git] / src / network / networkd-link.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2 /***
3 This file is part of systemd.
4
5 Copyright 2013 Tom Gundersen <teg@jklm.no>
6 ***/
7
8 #include <netinet/ether.h>
9 #include <linux/if.h>
10 #include <unistd.h>
11 #include <stdio_ext.h>
12
13 #include "alloc-util.h"
14 #include "bus-util.h"
15 #include "dhcp-lease-internal.h"
16 #include "fd-util.h"
17 #include "fileio.h"
18 #include "netlink-util.h"
19 #include "network-internal.h"
20 #include "networkd-ipv6-proxy-ndp.h"
21 #include "networkd-lldp-tx.h"
22 #include "networkd-manager.h"
23 #include "networkd-ndisc.h"
24 #include "networkd-radv.h"
25 #include "networkd-routing-policy-rule.h"
26 #include "set.h"
27 #include "socket-util.h"
28 #include "stdio-util.h"
29 #include "string-table.h"
30 #include "udev-util.h"
31 #include "util.h"
32 #include "virt.h"
33
34 static bool link_dhcp6_enabled(Link *link) {
35 assert(link);
36
37 if (!socket_ipv6_is_supported())
38 return false;
39
40 if (link->flags & IFF_LOOPBACK)
41 return false;
42
43 if (!link->network)
44 return false;
45
46 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
47 }
48
49 static bool link_dhcp4_enabled(Link *link) {
50 assert(link);
51
52 if (link->flags & IFF_LOOPBACK)
53 return false;
54
55 if (!link->network)
56 return false;
57
58 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
59 }
60
61 static bool link_dhcp4_server_enabled(Link *link) {
62 assert(link);
63
64 if (link->flags & IFF_LOOPBACK)
65 return false;
66
67 if (!link->network)
68 return false;
69
70 return link->network->dhcp_server;
71 }
72
73 static bool link_ipv4ll_enabled(Link *link) {
74 assert(link);
75
76 if (link->flags & IFF_LOOPBACK)
77 return false;
78
79 if (!link->network)
80 return false;
81
82 if (streq_ptr(link->kind, "wireguard"))
83 return false;
84
85 return link->network->link_local & ADDRESS_FAMILY_IPV4;
86 }
87
88 static bool link_ipv6ll_enabled(Link *link) {
89 assert(link);
90
91 if (!socket_ipv6_is_supported())
92 return false;
93
94 if (link->flags & IFF_LOOPBACK)
95 return false;
96
97 if (!link->network)
98 return false;
99
100 if (streq_ptr(link->kind, "wireguard"))
101 return false;
102
103 return link->network->link_local & ADDRESS_FAMILY_IPV6;
104 }
105
106 static bool link_ipv6_enabled(Link *link) {
107 assert(link);
108
109 if (!socket_ipv6_is_supported())
110 return false;
111
112 if (link->network->bridge)
113 return false;
114
115 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
116 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
117 }
118
119 static bool link_radv_enabled(Link *link) {
120 assert(link);
121
122 if (!link_ipv6ll_enabled(link))
123 return false;
124
125 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
126 }
127
128 static bool link_lldp_rx_enabled(Link *link) {
129 assert(link);
130
131 if (link->flags & IFF_LOOPBACK)
132 return false;
133
134 if (link->iftype != ARPHRD_ETHER)
135 return false;
136
137 if (!link->network)
138 return false;
139
140 /* LLDP should be handled on bridge slaves as those have a direct
141 * connection to their peers not on the bridge master. Linux doesn't
142 * even (by default) forward lldp packets to the bridge master.*/
143 if (streq_ptr("bridge", link->kind))
144 return false;
145
146 return link->network->lldp_mode != LLDP_MODE_NO;
147 }
148
149 static bool link_lldp_emit_enabled(Link *link) {
150 assert(link);
151
152 if (link->flags & IFF_LOOPBACK)
153 return false;
154
155 if (link->iftype != ARPHRD_ETHER)
156 return false;
157
158 if (!link->network)
159 return false;
160
161 return link->network->lldp_emit != LLDP_EMIT_NO;
162 }
163
164 static bool link_ipv4_forward_enabled(Link *link) {
165 assert(link);
166
167 if (link->flags & IFF_LOOPBACK)
168 return false;
169
170 if (!link->network)
171 return false;
172
173 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
174 return false;
175
176 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
177 }
178
179 static bool link_ipv6_forward_enabled(Link *link) {
180 assert(link);
181
182 if (!socket_ipv6_is_supported())
183 return false;
184
185 if (link->flags & IFF_LOOPBACK)
186 return false;
187
188 if (!link->network)
189 return false;
190
191 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
192 return false;
193
194 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
195 }
196
197 static bool link_proxy_arp_enabled(Link *link) {
198 assert(link);
199
200 if (link->flags & IFF_LOOPBACK)
201 return false;
202
203 if (!link->network)
204 return false;
205
206 if (link->network->proxy_arp < 0)
207 return false;
208
209 return true;
210 }
211
212 static bool link_ipv6_accept_ra_enabled(Link *link) {
213 assert(link);
214
215 if (!socket_ipv6_is_supported())
216 return false;
217
218 if (link->flags & IFF_LOOPBACK)
219 return false;
220
221 if (!link->network)
222 return false;
223
224 if (!link_ipv6ll_enabled(link))
225 return false;
226
227 /* If unset use system default (enabled if local forwarding is disabled.
228 * disabled if local forwarding is enabled).
229 * If set, ignore or enforce RA independent of local forwarding state.
230 */
231 if (link->network->ipv6_accept_ra < 0)
232 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
233 return !link_ipv6_forward_enabled(link);
234 else if (link->network->ipv6_accept_ra > 0)
235 /* accept RA even if ip_forward is enabled */
236 return true;
237 else
238 /* ignore RA */
239 return false;
240 }
241
242 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
243 assert(link);
244
245 if (!socket_ipv6_is_supported())
246 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
247
248 if (link->flags & IFF_LOOPBACK)
249 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
250
251 if (!link->network)
252 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
253
254 return link->network->ipv6_privacy_extensions;
255 }
256
257 static int link_enable_ipv6(Link *link) {
258 const char *p = NULL;
259 bool disabled;
260 int r;
261
262 if (link->flags & IFF_LOOPBACK)
263 return 0;
264
265 disabled = !link_ipv6_enabled(link);
266
267 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/disable_ipv6");
268
269 r = write_string_file(p, one_zero(disabled), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
270 if (r < 0)
271 log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m",
272 enable_disable(!disabled), link->ifname);
273 else
274 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
275
276 return 0;
277 }
278
279 void link_update_operstate(Link *link) {
280 LinkOperationalState operstate;
281 assert(link);
282
283 if (link->kernel_operstate == IF_OPER_DORMANT)
284 operstate = LINK_OPERSTATE_DORMANT;
285 else if (link_has_carrier(link)) {
286 Address *address;
287 uint8_t scope = RT_SCOPE_NOWHERE;
288 Iterator i;
289
290 /* if we have carrier, check what addresses we have */
291 SET_FOREACH(address, link->addresses, i) {
292 if (!address_is_ready(address))
293 continue;
294
295 if (address->scope < scope)
296 scope = address->scope;
297 }
298
299 /* for operstate we also take foreign addresses into account */
300 SET_FOREACH(address, link->addresses_foreign, i) {
301 if (!address_is_ready(address))
302 continue;
303
304 if (address->scope < scope)
305 scope = address->scope;
306 }
307
308 if (scope < RT_SCOPE_SITE)
309 /* universally accessible addresses found */
310 operstate = LINK_OPERSTATE_ROUTABLE;
311 else if (scope < RT_SCOPE_HOST)
312 /* only link or site local addresses found */
313 operstate = LINK_OPERSTATE_DEGRADED;
314 else
315 /* no useful addresses found */
316 operstate = LINK_OPERSTATE_CARRIER;
317 } else if (link->flags & IFF_UP)
318 operstate = LINK_OPERSTATE_NO_CARRIER;
319 else
320 operstate = LINK_OPERSTATE_OFF;
321
322 if (link->operstate != operstate) {
323 link->operstate = operstate;
324 link_send_changed(link, "OperationalState", NULL);
325 link_dirty(link);
326 }
327 }
328
329 #define FLAG_STRING(string, flag, old, new) \
330 (((old ^ new) & flag) \
331 ? ((old & flag) ? (" -" string) : (" +" string)) \
332 : "")
333
334 static int link_update_flags(Link *link, sd_netlink_message *m) {
335 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
336 uint8_t operstate;
337 int r;
338
339 assert(link);
340
341 r = sd_rtnl_message_link_get_flags(m, &flags);
342 if (r < 0)
343 return log_link_warning_errno(link, r, "Could not get link flags: %m");
344
345 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
346 if (r < 0)
347 /* if we got a message without operstate, take it to mean
348 the state was unchanged */
349 operstate = link->kernel_operstate;
350
351 if ((link->flags == flags) && (link->kernel_operstate == operstate))
352 return 0;
353
354 if (link->flags != flags) {
355 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",
356 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
357 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
358 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
359 FLAG_STRING("UP", IFF_UP, link->flags, flags),
360 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
361 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
362 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
363 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
364 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
365 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
366 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
367 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
368 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
369 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
370 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
371 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
372 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
373 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
374 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
375
376 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
377 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
378 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
379 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
380 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
381 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
382 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
383 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
384
385 /* link flags are currently at most 18 bits, let's align to
386 * printing 20 */
387 if (unknown_flags_added)
388 log_link_debug(link,
389 "Unknown link flags gained: %#.5x (ignoring)",
390 unknown_flags_added);
391
392 if (unknown_flags_removed)
393 log_link_debug(link,
394 "Unknown link flags lost: %#.5x (ignoring)",
395 unknown_flags_removed);
396 }
397
398 link->flags = flags;
399 link->kernel_operstate = operstate;
400
401 link_update_operstate(link);
402
403 return 0;
404 }
405
406 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
407 _cleanup_(link_unrefp) Link *link = NULL;
408 uint16_t type;
409 const char *ifname, *kind = NULL;
410 int r, ifindex;
411 unsigned short iftype;
412
413 assert(manager);
414 assert(message);
415 assert(ret);
416
417 /* check for link kind */
418 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
419 if (r == 0) {
420 (void)sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
421 r = sd_netlink_message_exit_container(message);
422 if (r < 0)
423 return r;
424 }
425
426 r = sd_netlink_message_get_type(message, &type);
427 if (r < 0)
428 return r;
429 else if (type != RTM_NEWLINK)
430 return -EINVAL;
431
432 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
433 if (r < 0)
434 return r;
435 else if (ifindex <= 0)
436 return -EINVAL;
437
438 r = sd_rtnl_message_link_get_type(message, &iftype);
439 if (r < 0)
440 return r;
441
442 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
443 if (r < 0)
444 return r;
445
446 link = new0(Link, 1);
447 if (!link)
448 return -ENOMEM;
449
450 link->n_ref = 1;
451 link->manager = manager;
452 link->state = LINK_STATE_PENDING;
453 link->rtnl_extended_attrs = true;
454 link->ifindex = ifindex;
455 link->iftype = iftype;
456 link->ifname = strdup(ifname);
457 if (!link->ifname)
458 return -ENOMEM;
459
460 if (kind) {
461 link->kind = strdup(kind);
462 if (!link->kind)
463 return -ENOMEM;
464 }
465
466 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
467 if (r < 0)
468 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
469
470 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
471 return -ENOMEM;
472
473 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
474 return -ENOMEM;
475
476 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
477 return -ENOMEM;
478
479 r = hashmap_ensure_allocated(&manager->links, NULL);
480 if (r < 0)
481 return r;
482
483 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
484 if (r < 0)
485 return r;
486
487 r = link_update_flags(link, message);
488 if (r < 0)
489 return r;
490
491 *ret = TAKE_PTR(link);
492
493 return 0;
494 }
495
496 static void link_free(Link *link) {
497 Address *address;
498 Link *carrier;
499 Iterator i;
500
501 if (!link)
502 return;
503
504 while (!set_isempty(link->addresses))
505 address_free(set_first(link->addresses));
506
507 while (!set_isempty(link->addresses_foreign))
508 address_free(set_first(link->addresses_foreign));
509
510 link->addresses = set_free(link->addresses);
511
512 link->addresses_foreign = set_free(link->addresses_foreign);
513
514 while ((address = link->pool_addresses)) {
515 LIST_REMOVE(addresses, link->pool_addresses, address);
516 address_free(address);
517 }
518
519 sd_dhcp_server_unref(link->dhcp_server);
520 sd_dhcp_client_unref(link->dhcp_client);
521 sd_dhcp_lease_unref(link->dhcp_lease);
522
523 link_lldp_emit_stop(link);
524
525 free(link->lease_file);
526
527 sd_lldp_unref(link->lldp);
528 free(link->lldp_file);
529
530 ndisc_flush(link);
531
532 sd_ipv4ll_unref(link->ipv4ll);
533 sd_dhcp6_client_unref(link->dhcp6_client);
534 sd_ndisc_unref(link->ndisc);
535 sd_radv_unref(link->radv);
536
537 if (link->manager)
538 hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex));
539
540 free(link->ifname);
541
542 free(link->kind);
543
544 (void)unlink(link->state_file);
545 free(link->state_file);
546
547 udev_device_unref(link->udev_device);
548
549 HASHMAP_FOREACH (carrier, link->bound_to_links, i)
550 hashmap_remove(link->bound_to_links, INT_TO_PTR(carrier->ifindex));
551 hashmap_free(link->bound_to_links);
552
553 HASHMAP_FOREACH (carrier, link->bound_by_links, i)
554 hashmap_remove(link->bound_by_links, INT_TO_PTR(carrier->ifindex));
555 hashmap_free(link->bound_by_links);
556
557 free(link);
558 }
559
560 Link *link_unref(Link *link) {
561 if (!link)
562 return NULL;
563
564 assert(link->n_ref > 0);
565
566 link->n_ref--;
567
568 if (link->n_ref > 0)
569 return NULL;
570
571 link_free(link);
572
573 return NULL;
574 }
575
576 Link *link_ref(Link *link) {
577 if (!link)
578 return NULL;
579
580 assert(link->n_ref > 0);
581
582 link->n_ref++;
583
584 return link;
585 }
586
587 int link_get(Manager *m, int ifindex, Link **ret) {
588 Link *link;
589
590 assert(m);
591 assert(ifindex);
592 assert(ret);
593
594 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
595 if (!link)
596 return -ENODEV;
597
598 *ret = link;
599
600 return 0;
601 }
602
603 static void link_set_state(Link *link, LinkState state) {
604 assert(link);
605
606 if (link->state == state)
607 return;
608
609 link->state = state;
610
611 link_send_changed(link, "AdministrativeState", NULL);
612 }
613
614 static void link_enter_unmanaged(Link *link) {
615 assert(link);
616
617 log_link_debug(link, "Unmanaged");
618
619 link_set_state(link, LINK_STATE_UNMANAGED);
620
621 link_dirty(link);
622 }
623
624 static int link_stop_clients(Link *link) {
625 int r = 0, k;
626
627 assert(link);
628 assert(link->manager);
629 assert(link->manager->event);
630
631 if (link->dhcp_client) {
632 k = sd_dhcp_client_stop(link->dhcp_client);
633 if (k < 0)
634 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
635 }
636
637 if (link->ipv4ll) {
638 k = sd_ipv4ll_stop(link->ipv4ll);
639 if (k < 0)
640 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
641 }
642
643 if (link->dhcp6_client) {
644 k = sd_dhcp6_client_stop(link->dhcp6_client);
645 if (k < 0)
646 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
647 }
648
649 if (link->ndisc) {
650 k = sd_ndisc_stop(link->ndisc);
651 if (k < 0)
652 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
653 }
654
655 if (link->radv) {
656 k = sd_radv_stop(link->radv);
657 if (k < 0)
658 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
659 }
660
661 link_lldp_emit_stop(link);
662 return r;
663 }
664
665 void link_enter_failed(Link *link) {
666 assert(link);
667
668 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
669 return;
670
671 log_link_warning(link, "Failed");
672
673 link_set_state(link, LINK_STATE_FAILED);
674
675 link_stop_clients(link);
676
677 link_dirty(link);
678 }
679
680 static Address* link_find_dhcp_server_address(Link *link) {
681 Address *address;
682
683 assert(link);
684 assert(link->network);
685
686 /* The first statically configured address if there is any */
687 LIST_FOREACH(addresses, address, link->network->static_addresses) {
688
689 if (address->family != AF_INET)
690 continue;
691
692 if (in_addr_is_null(address->family, &address->in_addr))
693 continue;
694
695 return address;
696 }
697
698 /* If that didn't work, find a suitable address we got from the pool */
699 LIST_FOREACH(addresses, address, link->pool_addresses) {
700 if (address->family != AF_INET)
701 continue;
702
703 return address;
704 }
705
706 return NULL;
707 }
708
709 static void link_enter_configured(Link *link) {
710 assert(link);
711 assert(link->network);
712
713 if (link->state != LINK_STATE_SETTING_ROUTES)
714 return;
715
716 log_link_info(link, "Configured");
717
718 link_set_state(link, LINK_STATE_CONFIGURED);
719
720 link_dirty(link);
721 }
722
723 void link_check_ready(Link *link) {
724 Address *a;
725 Iterator i;
726
727 assert(link);
728
729 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
730 return;
731
732 if (!link->network)
733 return;
734
735 if (!link->static_routes_configured)
736 return;
737
738 if (!link->routing_policy_rules_configured)
739 return;
740
741 if (link_ipv4ll_enabled(link))
742 if (!link->ipv4ll_address ||
743 !link->ipv4ll_route)
744 return;
745
746 if (!link->network->bridge) {
747
748 if (link_ipv6ll_enabled(link))
749 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) > 0)
750 return;
751
752 if ((link_dhcp4_enabled(link) && !link_dhcp6_enabled(link) &&
753 !link->dhcp4_configured) ||
754 (link_dhcp6_enabled(link) && !link_dhcp4_enabled(link) &&
755 !link->dhcp6_configured) ||
756 (link_dhcp4_enabled(link) && link_dhcp6_enabled(link) &&
757 !link->dhcp4_configured && !link->dhcp6_configured))
758 return;
759
760 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
761 return;
762 }
763
764 SET_FOREACH(a, link->addresses, i)
765 if (!address_is_ready(a))
766 return;
767
768 if (link->state != LINK_STATE_CONFIGURED)
769 link_enter_configured(link);
770
771 return;
772 }
773
774 static int link_set_routing_policy_rule(Link *link) {
775 RoutingPolicyRule *rule, *rrule = NULL;
776 int r;
777
778 assert(link);
779 assert(link->network);
780
781 LIST_FOREACH(rules, rule, link->network->rules) {
782 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
783 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif, &rrule);
784 if (r == 1) {
785 (void) routing_policy_rule_make_local(link->manager, rrule);
786 continue;
787 }
788
789 r = routing_policy_rule_configure(rule, link, link_routing_policy_rule_handler, false);
790 if (r < 0) {
791 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
792 link_enter_failed(link);
793 return r;
794 }
795
796 link->routing_policy_rule_messages++;
797 }
798
799 routing_policy_rule_purge(link->manager, link);
800 if (link->routing_policy_rule_messages == 0) {
801 link->routing_policy_rules_configured = true;
802 link_check_ready(link);
803 } else
804 log_link_debug(link, "Setting routing policy rules");
805
806 return 0;
807 }
808
809 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
810 _cleanup_(link_unrefp) Link *link = userdata;
811 int r;
812
813 assert(link->route_messages > 0);
814 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
815 LINK_STATE_SETTING_ROUTES, LINK_STATE_FAILED,
816 LINK_STATE_LINGER));
817
818 link->route_messages--;
819
820 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
821 return 1;
822
823 r = sd_netlink_message_get_errno(m);
824 if (r < 0 && r != -EEXIST)
825 log_link_warning_errno(link, r, "Could not set route: %m");
826
827 if (link->route_messages == 0) {
828 log_link_debug(link, "Routes set");
829 link->static_routes_configured = true;
830 link_check_ready(link);
831 }
832
833 return 1;
834 }
835
836 static int link_enter_set_routes(Link *link) {
837 Route *rt;
838 int r;
839
840 assert(link);
841 assert(link->network);
842 assert(link->state == LINK_STATE_SETTING_ADDRESSES);
843
844 (void) link_set_routing_policy_rule(link);
845
846 link_set_state(link, LINK_STATE_SETTING_ROUTES);
847
848 LIST_FOREACH(routes, rt, link->network->static_routes) {
849 r = route_configure(rt, link, route_handler);
850 if (r < 0) {
851 log_link_warning_errno(link, r, "Could not set routes: %m");
852 link_enter_failed(link);
853 return r;
854 }
855
856 link->route_messages++;
857 }
858
859 if (link->route_messages == 0) {
860 link->static_routes_configured = true;
861 link_check_ready(link);
862 } else
863 log_link_debug(link, "Setting routes");
864
865 return 0;
866 }
867
868 int link_route_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
869 _cleanup_(link_unrefp) Link *link = userdata;
870 int r;
871
872 assert(m);
873 assert(link);
874 assert(link->ifname);
875
876 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
877 return 1;
878
879 r = sd_netlink_message_get_errno(m);
880 if (r < 0 && r != -ESRCH)
881 log_link_warning_errno(link, r, "Could not drop route: %m");
882
883 return 1;
884 }
885
886 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
887 _cleanup_(link_unrefp) Link *link = userdata;
888 int r;
889
890 assert(rtnl);
891 assert(m);
892 assert(link);
893 assert(link->ifname);
894 assert(link->address_messages > 0);
895 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
896 LINK_STATE_FAILED, LINK_STATE_LINGER));
897
898 link->address_messages--;
899
900 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
901 return 1;
902
903 r = sd_netlink_message_get_errno(m);
904 if (r < 0 && r != -EEXIST)
905 log_link_warning_errno(link, r, "could not set address: %m");
906 else if (r >= 0)
907 manager_rtnl_process_address(rtnl, m, link->manager);
908
909 if (link->address_messages == 0) {
910 log_link_debug(link, "Addresses set");
911 link_enter_set_routes(link);
912 }
913
914 return 1;
915 }
916
917 static int address_label_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
918 _cleanup_(link_unrefp) Link *link = userdata;
919 int r;
920
921 assert(rtnl);
922 assert(m);
923 assert(link);
924 assert(link->ifname);
925 assert(link->address_label_messages > 0);
926
927 link->address_label_messages--;
928
929 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
930 return 1;
931
932 r = sd_netlink_message_get_errno(m);
933 if (r < 0 && r != -EEXIST)
934 log_link_warning_errno(link, r, "could not set address label: %m");
935 else if (r >= 0)
936 manager_rtnl_process_address(rtnl, m, link->manager);
937
938 if (link->address_label_messages == 0)
939 log_link_debug(link, "Addresses label set");
940
941 return 1;
942 }
943
944 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
945 _cleanup_free_ struct in_addr *addresses = NULL;
946 size_t n_addresses = 0, n_allocated = 0;
947 unsigned i;
948
949 log_debug("Copying DNS server information from %s", link->ifname);
950
951 if (!link->network)
952 return 0;
953
954 for (i = 0; i < link->network->n_dns; i++) {
955 struct in_addr ia;
956
957 /* Only look for IPv4 addresses */
958 if (link->network->dns[i].family != AF_INET)
959 continue;
960
961 ia = link->network->dns[i].address.in;
962
963 /* Never propagate obviously borked data */
964 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
965 continue;
966
967 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
968 return log_oom();
969
970 addresses[n_addresses++] = ia;
971 }
972
973 if (link->network->dhcp_use_dns && link->dhcp_lease) {
974 const struct in_addr *da = NULL;
975 int n;
976
977 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
978 if (n > 0) {
979
980 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
981 return log_oom();
982
983 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
984 n_addresses += n;
985 }
986 }
987
988 if (n_addresses <= 0)
989 return 0;
990
991 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
992 }
993
994 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
995 _cleanup_free_ struct in_addr *addresses = NULL;
996 size_t n_addresses = 0, n_allocated = 0;
997 char **a;
998
999 if (!link->network)
1000 return 0;
1001
1002 log_debug("Copying NTP server information from %s", link->ifname);
1003
1004 STRV_FOREACH(a, link->network->ntp) {
1005 struct in_addr ia;
1006
1007 /* Only look for IPv4 addresses */
1008 if (inet_pton(AF_INET, *a, &ia) <= 0)
1009 continue;
1010
1011 /* Never propagate obviously borked data */
1012 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1013 continue;
1014
1015 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1016 return log_oom();
1017
1018 addresses[n_addresses++] = ia;
1019 }
1020
1021 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1022 const struct in_addr *da = NULL;
1023 int n;
1024
1025 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1026 if (n > 0) {
1027
1028 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1029 return log_oom();
1030
1031 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
1032 n_addresses += n;
1033 }
1034 }
1035
1036 if (n_addresses <= 0)
1037 return 0;
1038
1039 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1040 }
1041
1042 static int link_set_bridge_fdb(Link *link) {
1043 FdbEntry *fdb_entry;
1044 int r;
1045
1046 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1047 r = fdb_entry_configure(link, fdb_entry);
1048 if (r < 0)
1049 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1050 }
1051
1052 return 0;
1053 }
1054
1055 static int link_enter_set_addresses(Link *link) {
1056 AddressLabel *label;
1057 Address *ad;
1058 int r;
1059
1060 assert(link);
1061 assert(link->network);
1062 assert(link->state != _LINK_STATE_INVALID);
1063
1064 r = link_set_bridge_fdb(link);
1065 if (r < 0)
1066 return r;
1067
1068 link_set_state(link, LINK_STATE_SETTING_ADDRESSES);
1069
1070 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1071 r = address_configure(ad, link, address_handler, false);
1072 if (r < 0) {
1073 log_link_warning_errno(link, r, "Could not set addresses: %m");
1074 link_enter_failed(link);
1075 return r;
1076 }
1077
1078 link->address_messages++;
1079 }
1080
1081 LIST_FOREACH(labels, label, link->network->address_labels) {
1082 r = address_label_configure(label, link, address_label_handler, false);
1083 if (r < 0) {
1084 log_link_warning_errno(link, r, "Could not set address label: %m");
1085 link_enter_failed(link);
1086 return r;
1087 }
1088
1089 link->address_label_messages++;
1090 }
1091
1092 /* now that we can figure out a default address for the dhcp server,
1093 start it */
1094 if (link_dhcp4_server_enabled(link)) {
1095 Address *address;
1096 Link *uplink = NULL;
1097 bool acquired_uplink = false;
1098
1099 address = link_find_dhcp_server_address(link);
1100 if (!address) {
1101 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1102 link_enter_failed(link);
1103 return 0;
1104 }
1105
1106 /* use the server address' subnet as the pool */
1107 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1108 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1109 if (r < 0)
1110 return r;
1111
1112 /* TODO:
1113 r = sd_dhcp_server_set_router(link->dhcp_server,
1114 &main_address->in_addr.in);
1115 if (r < 0)
1116 return r;
1117 */
1118
1119 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1120 r = sd_dhcp_server_set_max_lease_time(
1121 link->dhcp_server,
1122 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1123 if (r < 0)
1124 return r;
1125 }
1126
1127 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1128 r = sd_dhcp_server_set_default_lease_time(
1129 link->dhcp_server,
1130 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1131 if (r < 0)
1132 return r;
1133 }
1134
1135 if (link->network->dhcp_server_emit_dns) {
1136
1137 if (link->network->n_dhcp_server_dns > 0)
1138 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1139 else {
1140 uplink = manager_find_uplink(link->manager, link);
1141 acquired_uplink = true;
1142
1143 if (!uplink) {
1144 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1145 r = 0;
1146 } else
1147 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1148 }
1149 if (r < 0)
1150 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1151 }
1152
1153 if (link->network->dhcp_server_emit_ntp) {
1154
1155 if (link->network->n_dhcp_server_ntp > 0)
1156 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1157 else {
1158 if (!acquired_uplink)
1159 uplink = manager_find_uplink(link->manager, link);
1160
1161 if (!uplink) {
1162 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1163 r = 0;
1164 } else
1165 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1166
1167 }
1168 if (r < 0)
1169 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1170 }
1171
1172 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1173 if (r < 0) {
1174 log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1175 return r;
1176 }
1177
1178 if (link->network->dhcp_server_emit_timezone) {
1179 _cleanup_free_ char *buffer = NULL;
1180 const char *tz = NULL;
1181
1182 if (link->network->dhcp_server_timezone)
1183 tz = link->network->dhcp_server_timezone;
1184 else {
1185 r = get_timezone(&buffer);
1186 if (r < 0)
1187 log_warning_errno(r, "Failed to determine timezone: %m");
1188 else
1189 tz = buffer;
1190 }
1191
1192 if (tz) {
1193 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1194 if (r < 0)
1195 return r;
1196 }
1197 }
1198
1199 r = sd_dhcp_server_start(link->dhcp_server);
1200 if (r < 0) {
1201 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1202
1203 link_enter_failed(link);
1204
1205 return 0;
1206 }
1207
1208 log_link_debug(link, "Offering DHCPv4 leases");
1209 }
1210
1211 if (link->address_messages == 0)
1212 link_enter_set_routes(link);
1213 else
1214 log_link_debug(link, "Setting addresses");
1215
1216 return 0;
1217 }
1218
1219 int link_address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1220 _cleanup_(link_unrefp) Link *link = userdata;
1221 int r;
1222
1223 assert(m);
1224 assert(link);
1225 assert(link->ifname);
1226
1227 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1228 return 1;
1229
1230 r = sd_netlink_message_get_errno(m);
1231 if (r < 0 && r != -EADDRNOTAVAIL)
1232 log_link_warning_errno(link, r, "Could not drop address: %m");
1233
1234 return 1;
1235 }
1236
1237 static int link_set_bridge_vlan(Link *link) {
1238 int r = 0;
1239
1240 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1241 if (r < 0)
1242 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1243
1244 return r;
1245 }
1246
1247 static int link_set_proxy_arp(Link *link) {
1248 const char *p = NULL;
1249 int r;
1250
1251 if (!link_proxy_arp_enabled(link))
1252 return 0;
1253
1254 p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/proxy_arp");
1255
1256 r = write_string_file(p, one_zero(link->network->proxy_arp), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
1257 if (r < 0)
1258 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1259
1260 return 0;
1261 }
1262
1263 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1264 _cleanup_(link_unrefp) Link *link = userdata;
1265 int r;
1266
1267 log_link_debug(link, "Set link");
1268
1269 r = sd_netlink_message_get_errno(m);
1270 if (r < 0 && r != -EEXIST) {
1271 log_link_error_errno(link, r, "Could not join netdev: %m");
1272 link_enter_failed(link);
1273 return 1;
1274 }
1275
1276 return 0;
1277 }
1278
1279 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1280 _cleanup_(link_unrefp) Link *link = userdata;
1281 int r;
1282
1283 assert(m);
1284 assert(link);
1285 assert(link->ifname);
1286
1287 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1288 return 1;
1289
1290 r = sd_netlink_message_get_errno(m);
1291 if (r < 0)
1292 log_link_warning_errno(link, r, "Could not set MTU: %m");
1293
1294 return 1;
1295 }
1296
1297 int link_set_mtu(Link *link, uint32_t mtu) {
1298 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1299 int r;
1300
1301 assert(link);
1302 assert(link->manager);
1303 assert(link->manager->rtnl);
1304
1305 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1306
1307 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1308 if (r < 0)
1309 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1310
1311 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1312 if (r < 0)
1313 return log_link_error_errno(link, r, "Could not append MTU: %m");
1314
1315 r = sd_netlink_call_async(link->manager->rtnl, req, set_mtu_handler, link, 0, NULL);
1316 if (r < 0)
1317 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1318
1319 link->setting_mtu = true;
1320
1321 link_ref(link);
1322
1323 return 0;
1324 }
1325
1326 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1327 _cleanup_(link_unrefp) Link *link = userdata;
1328 int r;
1329
1330 assert(m);
1331 assert(link);
1332 assert(link->ifname);
1333
1334 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1335 return 1;
1336
1337 r = sd_netlink_message_get_errno(m);
1338 if (r < 0)
1339 log_link_warning_errno(link, r, "Could not set link flags: %m");
1340
1341 return 1;
1342 }
1343
1344 static int link_set_flags(Link *link) {
1345 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1346 unsigned ifi_change = 0;
1347 unsigned ifi_flags = 0;
1348 int r;
1349
1350 assert(link);
1351 assert(link->manager);
1352 assert(link->manager->rtnl);
1353
1354 if (link->flags & IFF_LOOPBACK)
1355 return 0;
1356
1357 if (!link->network)
1358 return 0;
1359
1360 if (link->network->arp < 0)
1361 return 0;
1362
1363 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1364 if (r < 0)
1365 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1366
1367 if (link->network->arp >= 0) {
1368 ifi_change |= IFF_NOARP;
1369 ifi_flags |= link->network->arp ? 0 : IFF_NOARP;
1370 }
1371
1372 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1373 if (r < 0)
1374 return log_link_error_errno(link, r, "Could not set link flags: %m");
1375
1376 r = sd_netlink_call_async(link->manager->rtnl, req, set_flags_handler, link, 0, NULL);
1377 if (r < 0)
1378 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1379
1380 link_ref(link);
1381
1382 return 0;
1383 }
1384
1385 static int link_set_bridge(Link *link) {
1386 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1387 int r;
1388
1389 assert(link);
1390 assert(link->network);
1391
1392 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1393 if (r < 0)
1394 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1395
1396 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1397 if (r < 0)
1398 return log_link_error_errno(link, r, "Could not set message family: %m");
1399
1400 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1401 if (r < 0)
1402 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1403
1404 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, !link->network->use_bpdu);
1405 if (r < 0)
1406 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1407
1408 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1409 if (r < 0)
1410 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1411
1412 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1413 if (r < 0)
1414 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1415
1416 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, !link->network->allow_port_to_be_root);
1417 if (r < 0)
1418 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1419
1420 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1421 if (r < 0)
1422 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1423
1424 if (link->network->cost != 0) {
1425 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1426 if (r < 0)
1427 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1428 }
1429 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1430 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1431 if (r < 0)
1432 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1433 }
1434
1435 r = sd_netlink_message_close_container(req);
1436 if (r < 0)
1437 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1438
1439 r = sd_netlink_call_async(link->manager->rtnl, req, link_set_handler, link, 0, NULL);
1440 if (r < 0)
1441 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1442
1443 link_ref(link);
1444
1445 return r;
1446 }
1447
1448 static int link_bond_set(Link *link) {
1449 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1450 int r;
1451
1452 assert(link);
1453 assert(link->network);
1454
1455 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1456 if (r < 0)
1457 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1458
1459 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1460 if (r < 0)
1461 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1462
1463 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1464 if (r < 0)
1465 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1466
1467 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1468 if (r < 0)
1469 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1470
1471 if (link->network->active_slave) {
1472 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1473 if (r < 0)
1474 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1475 }
1476
1477 if (link->network->primary_slave) {
1478 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1479 if (r < 0)
1480 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1481 }
1482
1483 r = sd_netlink_message_close_container(req);
1484 if (r < 0)
1485 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1486
1487 r = sd_netlink_message_close_container(req);
1488 if (r < 0)
1489 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1490
1491 r = sd_netlink_call_async(link->manager->rtnl, req, set_flags_handler, link, 0, NULL);
1492 if (r < 0)
1493 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1494
1495 link_ref(link);
1496
1497 return r;
1498 }
1499
1500 static int link_lldp_save(Link *link) {
1501 _cleanup_free_ char *temp_path = NULL;
1502 _cleanup_fclose_ FILE *f = NULL;
1503 sd_lldp_neighbor **l = NULL;
1504 int n = 0, r, i;
1505
1506 assert(link);
1507 assert(link->lldp_file);
1508
1509 if (!link->lldp) {
1510 (void) unlink(link->lldp_file);
1511 return 0;
1512 }
1513
1514 r = sd_lldp_get_neighbors(link->lldp, &l);
1515 if (r < 0)
1516 goto finish;
1517 if (r == 0) {
1518 (void) unlink(link->lldp_file);
1519 goto finish;
1520 }
1521
1522 n = r;
1523
1524 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1525 if (r < 0)
1526 goto finish;
1527
1528 fchmod(fileno(f), 0644);
1529
1530 for (i = 0; i < n; i++) {
1531 const void *p;
1532 le64_t u;
1533 size_t sz;
1534
1535 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1536 if (r < 0)
1537 goto finish;
1538
1539 u = htole64(sz);
1540 (void) fwrite(&u, 1, sizeof(u), f);
1541 (void) fwrite(p, 1, sz, f);
1542 }
1543
1544 r = fflush_and_check(f);
1545 if (r < 0)
1546 goto finish;
1547
1548 if (rename(temp_path, link->lldp_file) < 0) {
1549 r = -errno;
1550 goto finish;
1551 }
1552
1553 finish:
1554 if (r < 0) {
1555 (void) unlink(link->lldp_file);
1556 if (temp_path)
1557 (void) unlink(temp_path);
1558
1559 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1560 }
1561
1562 if (l) {
1563 for (i = 0; i < n; i++)
1564 sd_lldp_neighbor_unref(l[i]);
1565 free(l);
1566 }
1567
1568 return r;
1569 }
1570
1571 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1572 Link *link = userdata;
1573 int r;
1574
1575 assert(link);
1576
1577 (void) link_lldp_save(link);
1578
1579 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1580 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1581
1582 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1583
1584 r = link_lldp_emit_start(link);
1585 if (r < 0)
1586 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1587 }
1588 }
1589
1590 static int link_acquire_ipv6_conf(Link *link) {
1591 int r;
1592
1593 assert(link);
1594
1595 if (link_dhcp6_enabled(link)) {
1596 assert(link->dhcp6_client);
1597 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1598
1599 /* start DHCPv6 client in stateless mode */
1600 r = dhcp6_request_address(link, true);
1601 if (r < 0 && r != -EBUSY)
1602 return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m");
1603 else
1604 log_link_debug(link, "Acquiring DHCPv6 lease");
1605 }
1606
1607 if (link_ipv6_accept_ra_enabled(link)) {
1608 assert(link->ndisc);
1609
1610 log_link_debug(link, "Discovering IPv6 routers");
1611
1612 r = sd_ndisc_start(link->ndisc);
1613 if (r < 0 && r != -EBUSY)
1614 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1615 }
1616
1617 if (link_radv_enabled(link)) {
1618 assert(link->radv);
1619 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1620
1621 log_link_debug(link, "Starting IPv6 Router Advertisements");
1622
1623 r = sd_radv_start(link->radv);
1624 if (r < 0 && r != -EBUSY)
1625 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1626 }
1627
1628 return 0;
1629 }
1630
1631 static int link_acquire_ipv4_conf(Link *link) {
1632 int r;
1633
1634 assert(link);
1635 assert(link->network);
1636 assert(link->manager);
1637 assert(link->manager->event);
1638
1639 if (link_ipv4ll_enabled(link)) {
1640 assert(link->ipv4ll);
1641
1642 log_link_debug(link, "Acquiring IPv4 link-local address");
1643
1644 r = sd_ipv4ll_start(link->ipv4ll);
1645 if (r < 0)
1646 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1647 }
1648
1649 if (link_dhcp4_enabled(link)) {
1650 assert(link->dhcp_client);
1651
1652 log_link_debug(link, "Acquiring DHCPv4 lease");
1653
1654 r = sd_dhcp_client_start(link->dhcp_client);
1655 if (r < 0)
1656 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1657 }
1658
1659 return 0;
1660 }
1661
1662 static int link_acquire_conf(Link *link) {
1663 int r;
1664
1665 assert(link);
1666
1667 if (link->setting_mtu) {
1668 link->setting_mtu = false;
1669 return 0;
1670 }
1671
1672 r = link_acquire_ipv4_conf(link);
1673 if (r < 0)
1674 return r;
1675
1676 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) == 0) {
1677 r = link_acquire_ipv6_conf(link);
1678 if (r < 0)
1679 return r;
1680 }
1681
1682 if (link_lldp_emit_enabled(link)) {
1683 r = link_lldp_emit_start(link);
1684 if (r < 0)
1685 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1686 }
1687
1688 return 0;
1689 }
1690
1691 bool link_has_carrier(Link *link) {
1692 /* see Documentation/networking/operstates.txt in the kernel sources */
1693
1694 if (link->kernel_operstate == IF_OPER_UP)
1695 return true;
1696
1697 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1698 /* operstate may not be implemented, so fall back to flags */
1699 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1700 return true;
1701
1702 return false;
1703 }
1704
1705 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1706 _cleanup_(link_unrefp) Link *link = userdata;
1707 int r;
1708
1709 assert(link);
1710
1711 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1712 return 1;
1713
1714 r = sd_netlink_message_get_errno(m);
1715 if (r < 0)
1716 /* we warn but don't fail the link, as it may be
1717 brought up later */
1718 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1719
1720 return 1;
1721 }
1722
1723 int link_up(Link *link) {
1724 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1725 uint8_t ipv6ll_mode;
1726 int r;
1727
1728 assert(link);
1729 assert(link->network);
1730 assert(link->manager);
1731 assert(link->manager->rtnl);
1732
1733 log_link_debug(link, "Bringing link up");
1734
1735 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1736 if (r < 0)
1737 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1738
1739 /* set it free if not enslaved with networkd */
1740 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1741 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1742 if (r < 0)
1743 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1744 }
1745
1746 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1747 if (r < 0)
1748 return log_link_error_errno(link, r, "Could not set link flags: %m");
1749
1750 if (link->network->mac) {
1751 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1752 if (r < 0)
1753 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1754 }
1755
1756 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1757 for this interface, or if it is a bridge slave, then disable IPv6 else enable it. */
1758 (void) link_enable_ipv6(link);
1759
1760 if (link->network->mtu != 0) {
1761 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1762 on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1763 if (link_ipv6_enabled(link) && link->network->mtu < IPV6_MIN_MTU) {
1764
1765 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1766 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1767
1768 link->network->mtu = IPV6_MIN_MTU;
1769 }
1770
1771 r = sd_netlink_message_append_u32(req, IFLA_MTU, link->network->mtu);
1772 if (r < 0)
1773 return log_link_error_errno(link, r, "Could not set MTU: %m");
1774 }
1775
1776 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1777 if (r < 0)
1778 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1779
1780 if (link_ipv6_enabled(link)) {
1781 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
1782 r = sd_netlink_message_open_container(req, AF_INET6);
1783 if (r < 0)
1784 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1785
1786 if (!link_ipv6ll_enabled(link))
1787 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1788 else {
1789 const char *p = NULL;
1790 _cleanup_free_ char *stable_secret = NULL;
1791
1792 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/stable_secret");
1793 r = read_one_line_file(p, &stable_secret);
1794
1795 if (r < 0)
1796 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1797 else
1798 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1799 }
1800 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1801 if (r < 0)
1802 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1803
1804 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
1805 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
1806 if (r < 0)
1807 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
1808 }
1809
1810 r = sd_netlink_message_close_container(req);
1811 if (r < 0)
1812 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1813 }
1814
1815 r = sd_netlink_message_close_container(req);
1816 if (r < 0)
1817 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1818
1819 r = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
1820 if (r < 0)
1821 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1822
1823 link_ref(link);
1824
1825 return 0;
1826 }
1827
1828 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1829 _cleanup_(link_unrefp) Link *link = userdata;
1830 int r;
1831
1832 assert(link);
1833
1834 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1835 return 1;
1836
1837 r = sd_netlink_message_get_errno(m);
1838 if (r < 0)
1839 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1840
1841 return 1;
1842 }
1843
1844 int link_down(Link *link) {
1845 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1846 int r;
1847
1848 assert(link);
1849 assert(link->manager);
1850 assert(link->manager->rtnl);
1851
1852 log_link_debug(link, "Bringing link down");
1853
1854 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1855 RTM_SETLINK, link->ifindex);
1856 if (r < 0)
1857 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1858
1859 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1860 if (r < 0)
1861 return log_link_error_errno(link, r, "Could not set link flags: %m");
1862
1863 r = sd_netlink_call_async(link->manager->rtnl, req, link_down_handler, link, 0, NULL);
1864 if (r < 0)
1865 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1866
1867 link_ref(link);
1868
1869 return 0;
1870 }
1871
1872 static int link_up_can(Link *link) {
1873 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1874 int r;
1875
1876 assert(link);
1877
1878 log_link_debug(link, "Bringing CAN link up");
1879
1880 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1881 if (r < 0)
1882 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1883
1884 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1885 if (r < 0)
1886 return log_link_error_errno(link, r, "Could not set link flags: %m");
1887
1888 r = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
1889 if (r < 0)
1890 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1891
1892 link_ref(link);
1893
1894 return 0;
1895 }
1896
1897 static int link_handle_bound_to_list(Link *link) {
1898 Link *l;
1899 Iterator i;
1900 int r;
1901 bool required_up = false;
1902 bool link_is_up = false;
1903
1904 assert(link);
1905
1906 if (hashmap_isempty(link->bound_to_links))
1907 return 0;
1908
1909 if (link->flags & IFF_UP)
1910 link_is_up = true;
1911
1912 HASHMAP_FOREACH (l, link->bound_to_links, i)
1913 if (link_has_carrier(l)) {
1914 required_up = true;
1915 break;
1916 }
1917
1918 if (!required_up && link_is_up) {
1919 r = link_down(link);
1920 if (r < 0)
1921 return r;
1922 } else if (required_up && !link_is_up) {
1923 r = link_up(link);
1924 if (r < 0)
1925 return r;
1926 }
1927
1928 return 0;
1929 }
1930
1931 static int link_handle_bound_by_list(Link *link) {
1932 Iterator i;
1933 Link *l;
1934 int r;
1935
1936 assert(link);
1937
1938 if (hashmap_isempty(link->bound_by_links))
1939 return 0;
1940
1941 HASHMAP_FOREACH (l, link->bound_by_links, i) {
1942 r = link_handle_bound_to_list(l);
1943 if (r < 0)
1944 return r;
1945 }
1946
1947 return 0;
1948 }
1949
1950 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1951 int r;
1952
1953 assert(link);
1954 assert(carrier);
1955
1956 if (link == carrier)
1957 return 0;
1958
1959 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1960 return 0;
1961
1962 r = hashmap_ensure_allocated(h, NULL);
1963 if (r < 0)
1964 return r;
1965
1966 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1967 if (r < 0)
1968 return r;
1969
1970 return 0;
1971 }
1972
1973 static int link_new_bound_by_list(Link *link) {
1974 Manager *m;
1975 Link *carrier;
1976 Iterator i;
1977 int r;
1978 bool list_updated = false;
1979
1980 assert(link);
1981 assert(link->manager);
1982
1983 m = link->manager;
1984
1985 HASHMAP_FOREACH(carrier, m->links, i) {
1986 if (!carrier->network)
1987 continue;
1988
1989 if (strv_isempty(carrier->network->bind_carrier))
1990 continue;
1991
1992 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
1993 r = link_put_carrier(link, carrier, &link->bound_by_links);
1994 if (r < 0)
1995 return r;
1996
1997 list_updated = true;
1998 }
1999 }
2000
2001 if (list_updated)
2002 link_dirty(link);
2003
2004 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2005 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2006 if (r < 0)
2007 return r;
2008
2009 link_dirty(carrier);
2010 }
2011
2012 return 0;
2013 }
2014
2015 static int link_new_bound_to_list(Link *link) {
2016 Manager *m;
2017 Link *carrier;
2018 Iterator i;
2019 int r;
2020 bool list_updated = false;
2021
2022 assert(link);
2023 assert(link->manager);
2024
2025 if (!link->network)
2026 return 0;
2027
2028 if (strv_isempty(link->network->bind_carrier))
2029 return 0;
2030
2031 m = link->manager;
2032
2033 HASHMAP_FOREACH (carrier, m->links, i) {
2034 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2035 r = link_put_carrier(link, carrier, &link->bound_to_links);
2036 if (r < 0)
2037 return r;
2038
2039 list_updated = true;
2040 }
2041 }
2042
2043 if (list_updated)
2044 link_dirty(link);
2045
2046 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2047 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2048 if (r < 0)
2049 return r;
2050
2051 link_dirty(carrier);
2052 }
2053
2054 return 0;
2055 }
2056
2057 static int link_new_carrier_maps(Link *link) {
2058 int r;
2059
2060 r = link_new_bound_by_list(link);
2061 if (r < 0)
2062 return r;
2063
2064 r = link_handle_bound_by_list(link);
2065 if (r < 0)
2066 return r;
2067
2068 r = link_new_bound_to_list(link);
2069 if (r < 0)
2070 return r;
2071
2072 r = link_handle_bound_to_list(link);
2073 if (r < 0)
2074 return r;
2075
2076 return 0;
2077 }
2078
2079 static void link_free_bound_to_list(Link *link) {
2080 Link *bound_to;
2081 Iterator i;
2082
2083 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2084 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2085
2086 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2087 link_dirty(bound_to);
2088 }
2089
2090 return;
2091 }
2092
2093 static void link_free_bound_by_list(Link *link) {
2094 Link *bound_by;
2095 Iterator i;
2096
2097 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2098 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2099
2100 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2101 link_dirty(bound_by);
2102 link_handle_bound_to_list(bound_by);
2103 }
2104 }
2105
2106 return;
2107 }
2108
2109 static void link_free_carrier_maps(Link *link) {
2110 bool list_updated = false;
2111
2112 assert(link);
2113
2114 if (!hashmap_isempty(link->bound_to_links)) {
2115 link_free_bound_to_list(link);
2116 list_updated = true;
2117 }
2118
2119 if (!hashmap_isempty(link->bound_by_links)) {
2120 link_free_bound_by_list(link);
2121 list_updated = true;
2122 }
2123
2124 if (list_updated)
2125 link_dirty(link);
2126
2127 return;
2128 }
2129
2130 void link_drop(Link *link) {
2131 if (!link || link->state == LINK_STATE_LINGER)
2132 return;
2133
2134 link_set_state(link, LINK_STATE_LINGER);
2135
2136 link_free_carrier_maps(link);
2137
2138 log_link_debug(link, "Link removed");
2139
2140 (void)unlink(link->state_file);
2141 link_unref(link);
2142
2143 return;
2144 }
2145
2146 static int link_joined(Link *link) {
2147 int r;
2148
2149 assert(link);
2150 assert(link->network);
2151
2152 if (!hashmap_isempty(link->bound_to_links)) {
2153 r = link_handle_bound_to_list(link);
2154 if (r < 0)
2155 return r;
2156 } else if (!(link->flags & IFF_UP)) {
2157 r = link_up(link);
2158 if (r < 0) {
2159 link_enter_failed(link);
2160 return r;
2161 }
2162 }
2163
2164 if (link->network->bridge) {
2165 r = link_set_bridge(link);
2166 if (r < 0)
2167 log_link_error_errno(link, r, "Could not set bridge message: %m");
2168 }
2169
2170 if (link->network->bond) {
2171 r = link_bond_set(link);
2172 if (r < 0)
2173 log_link_error_errno(link, r, "Could not set bond message: %m");
2174 }
2175
2176 if (link->network->use_br_vlan &&
2177 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2178 r = link_set_bridge_vlan(link);
2179 if (r < 0)
2180 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2181 }
2182
2183 /* Skip setting up addresses until it gets carrier,
2184 or it would try to set addresses twice,
2185 which is bad for non-idempotent steps. */
2186 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2187 return 0;
2188
2189 return link_enter_set_addresses(link);
2190 }
2191
2192 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
2193 _cleanup_(link_unrefp) Link *link = userdata;
2194 int r;
2195
2196 assert(link);
2197 assert(link->network);
2198
2199 link->enslaving--;
2200
2201 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2202 return 1;
2203
2204 r = sd_netlink_message_get_errno(m);
2205 if (r < 0 && r != -EEXIST) {
2206 log_link_error_errno(link, r, "Could not join netdev: %m");
2207 link_enter_failed(link);
2208 return 1;
2209 } else
2210 log_link_debug(link, "Joined netdev");
2211
2212 if (link->enslaving <= 0)
2213 link_joined(link);
2214
2215 return 1;
2216 }
2217
2218 static int link_enter_join_netdev(Link *link) {
2219 NetDev *netdev;
2220 Iterator i;
2221 int r;
2222
2223 assert(link);
2224 assert(link->network);
2225 assert(link->state == LINK_STATE_PENDING);
2226
2227 link_set_state(link, LINK_STATE_ENSLAVING);
2228
2229 link_dirty(link);
2230
2231 if (!link->network->bridge &&
2232 !link->network->bond &&
2233 !link->network->vrf &&
2234 hashmap_isempty(link->network->stacked_netdevs))
2235 return link_joined(link);
2236
2237 if (link->network->bond) {
2238 log_struct(LOG_DEBUG,
2239 LOG_LINK_INTERFACE(link),
2240 LOG_NETDEV_INTERFACE(link->network->bond),
2241 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname),
2242 NULL);
2243
2244 r = netdev_join(link->network->bond, link, netdev_join_handler);
2245 if (r < 0) {
2246 log_struct_errno(LOG_WARNING, r,
2247 LOG_LINK_INTERFACE(link),
2248 LOG_NETDEV_INTERFACE(link->network->bond),
2249 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname),
2250 NULL);
2251
2252 link_enter_failed(link);
2253 return r;
2254 }
2255
2256 link->enslaving++;
2257 }
2258
2259 if (link->network->bridge) {
2260 log_struct(LOG_DEBUG,
2261 LOG_LINK_INTERFACE(link),
2262 LOG_NETDEV_INTERFACE(link->network->bridge),
2263 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname),
2264 NULL);
2265
2266 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2267 if (r < 0) {
2268 log_struct_errno(LOG_WARNING, r,
2269 LOG_LINK_INTERFACE(link),
2270 LOG_NETDEV_INTERFACE(link->network->bridge),
2271 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname),
2272 NULL),
2273 link_enter_failed(link);
2274 return r;
2275 }
2276
2277 link->enslaving++;
2278 }
2279
2280 if (link->network->vrf) {
2281 log_struct(LOG_DEBUG,
2282 LOG_LINK_INTERFACE(link),
2283 LOG_NETDEV_INTERFACE(link->network->vrf),
2284 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname),
2285 NULL);
2286 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2287 if (r < 0) {
2288 log_struct_errno(LOG_WARNING, r,
2289 LOG_LINK_INTERFACE(link),
2290 LOG_NETDEV_INTERFACE(link->network->vrf),
2291 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname),
2292 NULL);
2293 link_enter_failed(link);
2294 return r;
2295 }
2296
2297 link->enslaving++;
2298 }
2299
2300 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2301
2302 if (netdev->ifindex > 0) {
2303 link_joined(link);
2304 continue;
2305 }
2306
2307 log_struct(LOG_DEBUG,
2308 LOG_LINK_INTERFACE(link),
2309 LOG_NETDEV_INTERFACE(netdev),
2310 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname),
2311 NULL);
2312
2313 r = netdev_join(netdev, link, netdev_join_handler);
2314 if (r < 0) {
2315 log_struct_errno(LOG_WARNING, r,
2316 LOG_LINK_INTERFACE(link),
2317 LOG_NETDEV_INTERFACE(netdev),
2318 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname),
2319 NULL);
2320 link_enter_failed(link);
2321 return r;
2322 }
2323
2324 link->enslaving++;
2325 }
2326
2327 return 0;
2328 }
2329
2330 static int link_set_ipv4_forward(Link *link) {
2331 int r;
2332
2333 if (!link_ipv4_forward_enabled(link))
2334 return 0;
2335
2336 /* We propagate the forwarding flag from one interface to the
2337 * global setting one way. This means: as long as at least one
2338 * interface was configured at any time that had IP forwarding
2339 * enabled the setting will stay on for good. We do this
2340 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2341 * somewhat in sync (see below). */
2342
2343 r = write_string_file("/proc/sys/net/ipv4/ip_forward", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2344 if (r < 0)
2345 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2346
2347 return 0;
2348 }
2349
2350 static int link_set_ipv6_forward(Link *link) {
2351 int r;
2352
2353 if (!link_ipv6_forward_enabled(link))
2354 return 0;
2355
2356 /* On Linux, the IPv6 stack does not know a per-interface
2357 * packet forwarding setting: either packet forwarding is on
2358 * for all, or off for all. We hence don't bother with a
2359 * per-interface setting, but simply propagate the interface
2360 * flag, if it is set, to the global flag, one-way. Note that
2361 * while IPv4 would allow a per-interface flag, we expose the
2362 * same behaviour there and also propagate the setting from
2363 * one to all, to keep things simple (see above). */
2364
2365 r = write_string_file("/proc/sys/net/ipv6/conf/all/forwarding", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2366 if (r < 0)
2367 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2368
2369 return 0;
2370 }
2371
2372 static int link_set_ipv6_privacy_extensions(Link *link) {
2373 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2374 IPv6PrivacyExtensions s;
2375 const char *p = NULL;
2376 int r;
2377
2378 s = link_ipv6_privacy_extensions(link);
2379 if (s < 0)
2380 return 0;
2381
2382 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/use_tempaddr");
2383 xsprintf(buf, "%u", (unsigned) link->network->ipv6_privacy_extensions);
2384
2385 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2386 if (r < 0)
2387 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2388
2389 return 0;
2390 }
2391
2392 static int link_set_ipv6_accept_ra(Link *link) {
2393 const char *p = NULL;
2394 int r;
2395
2396 /* Make this a NOP if IPv6 is not available */
2397 if (!socket_ipv6_is_supported())
2398 return 0;
2399
2400 if (link->flags & IFF_LOOPBACK)
2401 return 0;
2402
2403 if (!link->network)
2404 return 0;
2405
2406 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/accept_ra");
2407
2408 /* We handle router advertisements ourselves, tell the kernel to GTFO */
2409 r = write_string_file(p, "0", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2410 if (r < 0)
2411 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2412
2413 return 0;
2414 }
2415
2416 static int link_set_ipv6_dad_transmits(Link *link) {
2417 char buf[DECIMAL_STR_MAX(int) + 1];
2418 const char *p = NULL;
2419 int r;
2420
2421 /* Make this a NOP if IPv6 is not available */
2422 if (!socket_ipv6_is_supported())
2423 return 0;
2424
2425 if (link->flags & IFF_LOOPBACK)
2426 return 0;
2427
2428 if (!link->network)
2429 return 0;
2430
2431 if (link->network->ipv6_dad_transmits < 0)
2432 return 0;
2433
2434 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/dad_transmits");
2435 xsprintf(buf, "%i", link->network->ipv6_dad_transmits);
2436
2437 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2438 if (r < 0)
2439 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2440
2441 return 0;
2442 }
2443
2444 static int link_set_ipv6_hop_limit(Link *link) {
2445 char buf[DECIMAL_STR_MAX(int) + 1];
2446 const char *p = NULL;
2447 int r;
2448
2449 /* Make this a NOP if IPv6 is not available */
2450 if (!socket_ipv6_is_supported())
2451 return 0;
2452
2453 if (link->flags & IFF_LOOPBACK)
2454 return 0;
2455
2456 if (!link->network)
2457 return 0;
2458
2459 if (link->network->ipv6_hop_limit < 0)
2460 return 0;
2461
2462 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/hop_limit");
2463 xsprintf(buf, "%i", link->network->ipv6_hop_limit);
2464
2465 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2466 if (r < 0)
2467 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2468
2469 return 0;
2470 }
2471
2472 static int link_set_ipv6_mtu(Link *link) {
2473 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2474 const char *p = NULL;
2475 int r;
2476
2477 /* Make this a NOP if IPv6 is not available */
2478 if (!socket_ipv6_is_supported())
2479 return 0;
2480
2481 if (link->flags & IFF_LOOPBACK)
2482 return 0;
2483
2484 if (link->network->ipv6_mtu == 0)
2485 return 0;
2486
2487 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/mtu");
2488
2489 xsprintf(buf, "%" PRIu32, link->network->ipv6_mtu);
2490
2491 r = write_string_file(p, buf, 0);
2492 if (r < 0)
2493 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2494
2495 return 0;
2496 }
2497
2498 static int link_drop_foreign_config(Link *link) {
2499 Address *address;
2500 Route *route;
2501 Iterator i;
2502 int r;
2503
2504 SET_FOREACH(address, link->addresses_foreign, i) {
2505 /* we consider IPv6LL addresses to be managed by the kernel */
2506 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2507 continue;
2508
2509 r = address_remove(address, link, link_address_remove_handler);
2510 if (r < 0)
2511 return r;
2512 }
2513
2514 SET_FOREACH(route, link->routes_foreign, i) {
2515 /* do not touch routes managed by the kernel */
2516 if (route->protocol == RTPROT_KERNEL)
2517 continue;
2518
2519 r = route_remove(route, link, link_route_remove_handler);
2520 if (r < 0)
2521 return r;
2522 }
2523
2524 return 0;
2525 }
2526
2527 static int link_drop_config(Link *link) {
2528 Address *address, *pool_address;
2529 Route *route;
2530 Iterator i;
2531 int r;
2532
2533 SET_FOREACH(address, link->addresses, i) {
2534 /* we consider IPv6LL addresses to be managed by the kernel */
2535 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2536 continue;
2537
2538 r = address_remove(address, link, link_address_remove_handler);
2539 if (r < 0)
2540 return r;
2541
2542 /* If this address came from an address pool, clean up the pool */
2543 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2544 if (address_equal(address, pool_address)) {
2545 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2546 address_free(pool_address);
2547 break;
2548 }
2549 }
2550 }
2551
2552 SET_FOREACH(route, link->routes, i) {
2553 /* do not touch routes managed by the kernel */
2554 if (route->protocol == RTPROT_KERNEL)
2555 continue;
2556
2557 r = route_remove(route, link, link_route_remove_handler);
2558 if (r < 0)
2559 return r;
2560 }
2561
2562 ndisc_flush(link);
2563
2564 return 0;
2565 }
2566
2567 static int link_update_lldp(Link *link) {
2568 int r;
2569
2570 assert(link);
2571
2572 if (!link->lldp)
2573 return 0;
2574
2575 if (link->flags & IFF_UP) {
2576 r = sd_lldp_start(link->lldp);
2577 if (r > 0)
2578 log_link_debug(link, "Started LLDP.");
2579 } else {
2580 r = sd_lldp_stop(link->lldp);
2581 if (r > 0)
2582 log_link_debug(link, "Stopped LLDP.");
2583 }
2584
2585 return r;
2586 }
2587
2588 static int link_configure(Link *link) {
2589 int r;
2590
2591 assert(link);
2592 assert(link->network);
2593 assert(link->state == LINK_STATE_PENDING);
2594
2595 if (streq_ptr(link->kind, "vcan")) {
2596
2597 if (!(link->flags & IFF_UP)) {
2598 r = link_up_can(link);
2599 if (r < 0) {
2600 link_enter_failed(link);
2601 return r;
2602 }
2603 }
2604
2605 return 0;
2606 }
2607
2608 /* Drop foreign config, but ignore loopback or critical devices.
2609 * We do not want to remove loopback address or addresses used for root NFS. */
2610 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2611 r = link_drop_foreign_config(link);
2612 if (r < 0)
2613 return r;
2614 }
2615
2616 r = link_set_proxy_arp(link);
2617 if (r < 0)
2618 return r;
2619
2620 r = ipv6_proxy_ndp_addresses_configure(link);
2621 if (r < 0)
2622 return r;
2623
2624 r = link_set_ipv4_forward(link);
2625 if (r < 0)
2626 return r;
2627
2628 r = link_set_ipv6_forward(link);
2629 if (r < 0)
2630 return r;
2631
2632 r = link_set_ipv6_privacy_extensions(link);
2633 if (r < 0)
2634 return r;
2635
2636 r = link_set_ipv6_accept_ra(link);
2637 if (r < 0)
2638 return r;
2639
2640 r = link_set_ipv6_dad_transmits(link);
2641 if (r < 0)
2642 return r;
2643
2644 r = link_set_ipv6_hop_limit(link);
2645 if (r < 0)
2646 return r;
2647
2648 r = link_set_flags(link);
2649 if (r < 0)
2650 return r;
2651
2652 r = link_set_ipv6_mtu(link);
2653 if (r < 0)
2654 return r;
2655
2656 if (link_ipv4ll_enabled(link)) {
2657 r = ipv4ll_configure(link);
2658 if (r < 0)
2659 return r;
2660 }
2661
2662 if (link_dhcp4_enabled(link)) {
2663 r = dhcp4_set_promote_secondaries(link);
2664 if (r < 0)
2665 return r;
2666
2667 r = dhcp4_configure(link);
2668 if (r < 0)
2669 return r;
2670 }
2671
2672 if (link_dhcp4_server_enabled(link)) {
2673 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2674 if (r < 0)
2675 return r;
2676
2677 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2678 if (r < 0)
2679 return r;
2680 }
2681
2682 if (link_dhcp6_enabled(link) ||
2683 link_ipv6_accept_ra_enabled(link)) {
2684 r = dhcp6_configure(link);
2685 if (r < 0)
2686 return r;
2687 }
2688
2689 if (link_ipv6_accept_ra_enabled(link)) {
2690 r = ndisc_configure(link);
2691 if (r < 0)
2692 return r;
2693 }
2694
2695 if (link_radv_enabled(link)) {
2696 r = radv_configure(link);
2697 if (r < 0)
2698 return r;
2699 }
2700
2701 if (link_lldp_rx_enabled(link)) {
2702 r = sd_lldp_new(&link->lldp);
2703 if (r < 0)
2704 return r;
2705
2706 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
2707 if (r < 0)
2708 return r;
2709
2710 r = sd_lldp_match_capabilities(link->lldp,
2711 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
2712 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
2713 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
2714 if (r < 0)
2715 return r;
2716
2717 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
2718 if (r < 0)
2719 return r;
2720
2721 r = sd_lldp_attach_event(link->lldp, NULL, 0);
2722 if (r < 0)
2723 return r;
2724
2725 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
2726 if (r < 0)
2727 return r;
2728
2729 r = link_update_lldp(link);
2730 if (r < 0)
2731 return r;
2732 }
2733
2734 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2735 r = link_acquire_conf(link);
2736 if (r < 0)
2737 return r;
2738 }
2739
2740 return link_enter_join_netdev(link);
2741 }
2742
2743 static int link_initialized_and_synced(sd_netlink *rtnl, sd_netlink_message *m,
2744 void *userdata) {
2745 _cleanup_(link_unrefp) Link *link = userdata;
2746 Network *network;
2747 int r;
2748
2749 assert(link);
2750 assert(link->ifname);
2751 assert(link->manager);
2752
2753 if (link->state != LINK_STATE_PENDING)
2754 return 1;
2755
2756 log_link_debug(link, "Link state is up-to-date");
2757
2758 r = link_new_bound_by_list(link);
2759 if (r < 0)
2760 return r;
2761
2762 r = link_handle_bound_by_list(link);
2763 if (r < 0)
2764 return r;
2765
2766 if (!link->network) {
2767 r = network_get(link->manager, link->udev_device, link->ifname,
2768 &link->mac, &network);
2769 if (r == -ENOENT) {
2770 link_enter_unmanaged(link);
2771 return 1;
2772 } else if (r == 0 && network->unmanaged) {
2773 link_enter_unmanaged(link);
2774 return 0;
2775 } else if (r < 0)
2776 return r;
2777
2778 if (link->flags & IFF_LOOPBACK) {
2779 if (network->link_local != ADDRESS_FAMILY_NO)
2780 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2781
2782 if (network->dhcp != ADDRESS_FAMILY_NO)
2783 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2784
2785 if (network->dhcp_server)
2786 log_link_debug(link, "Ignoring DHCP server for loopback link");
2787 }
2788
2789 r = network_apply(network, link);
2790 if (r < 0)
2791 return r;
2792 }
2793
2794 r = link_new_bound_to_list(link);
2795 if (r < 0)
2796 return r;
2797
2798 r = link_configure(link);
2799 if (r < 0)
2800 return r;
2801
2802 return 1;
2803 }
2804
2805 int link_initialized(Link *link, struct udev_device *device) {
2806 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2807 int r;
2808
2809 assert(link);
2810 assert(link->manager);
2811 assert(link->manager->rtnl);
2812 assert(device);
2813
2814 if (link->state != LINK_STATE_PENDING)
2815 return 0;
2816
2817 if (link->udev_device)
2818 return 0;
2819
2820 log_link_debug(link, "udev initialized link");
2821
2822 link->udev_device = udev_device_ref(device);
2823
2824 /* udev has initialized the link, but we don't know if we have yet
2825 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2826 * when it returns we know that the pending NEWLINKs have already been
2827 * processed and that we are up-to-date */
2828
2829 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2830 link->ifindex);
2831 if (r < 0)
2832 return r;
2833
2834 r = sd_netlink_call_async(link->manager->rtnl, req,
2835 link_initialized_and_synced, link, 0, NULL);
2836 if (r < 0)
2837 return r;
2838
2839 link_ref(link);
2840
2841 return 0;
2842 }
2843
2844 static int link_load(Link *link) {
2845 _cleanup_free_ char *network_file = NULL,
2846 *addresses = NULL,
2847 *routes = NULL,
2848 *dhcp4_address = NULL,
2849 *ipv4ll_address = NULL;
2850 union in_addr_union address;
2851 union in_addr_union route_dst;
2852 const char *p;
2853 int r;
2854
2855 assert(link);
2856
2857 r = parse_env_file(link->state_file, NEWLINE,
2858 "NETWORK_FILE", &network_file,
2859 "ADDRESSES", &addresses,
2860 "ROUTES", &routes,
2861 "DHCP4_ADDRESS", &dhcp4_address,
2862 "IPV4LL_ADDRESS", &ipv4ll_address,
2863 NULL);
2864 if (r < 0 && r != -ENOENT)
2865 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
2866
2867 if (network_file) {
2868 Network *network;
2869 char *suffix;
2870
2871 /* drop suffix */
2872 suffix = strrchr(network_file, '.');
2873 if (!suffix) {
2874 log_link_debug(link, "Failed to get network name from %s", network_file);
2875 goto network_file_fail;
2876 }
2877 *suffix = '\0';
2878
2879 r = network_get_by_name(link->manager, basename(network_file), &network);
2880 if (r < 0) {
2881 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
2882 goto network_file_fail;
2883 }
2884
2885 r = network_apply(network, link);
2886 if (r < 0)
2887 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
2888 }
2889
2890 network_file_fail:
2891
2892 if (addresses) {
2893 p = addresses;
2894
2895 for (;;) {
2896 _cleanup_free_ char *address_str = NULL;
2897 char *prefixlen_str;
2898 int family;
2899 unsigned char prefixlen;
2900
2901 r = extract_first_word(&p, &address_str, NULL, 0);
2902 if (r < 0) {
2903 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
2904 continue;
2905 }
2906 if (r == 0)
2907 break;
2908
2909 prefixlen_str = strchr(address_str, '/');
2910 if (!prefixlen_str) {
2911 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
2912 continue;
2913 }
2914
2915 *prefixlen_str++ = '\0';
2916
2917 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
2918 if (r != 1) {
2919 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
2920 continue;
2921 }
2922
2923 r = in_addr_from_string_auto(address_str, &family, &address);
2924 if (r < 0) {
2925 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
2926 continue;
2927 }
2928
2929 r = address_add(link, family, &address, prefixlen, NULL);
2930 if (r < 0)
2931 return log_link_error_errno(link, r, "Failed to add address: %m");
2932 }
2933 }
2934
2935 if (routes) {
2936 p = routes;
2937
2938 for (;;) {
2939 Route *route;
2940 _cleanup_free_ char *route_str = NULL;
2941 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
2942 usec_t lifetime;
2943 char *prefixlen_str;
2944 int family;
2945 unsigned char prefixlen, tos, table;
2946 uint32_t priority;
2947
2948 r = extract_first_word(&p, &route_str, NULL, 0);
2949 if (r < 0) {
2950 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
2951 continue;
2952 }
2953 if (r == 0)
2954 break;
2955
2956 prefixlen_str = strchr(route_str, '/');
2957 if (!prefixlen_str) {
2958 log_link_debug(link, "Failed to parse route %s", route_str);
2959 continue;
2960 }
2961
2962 *prefixlen_str++ = '\0';
2963
2964 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
2965 if (r != 5) {
2966 log_link_debug(link,
2967 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
2968 prefixlen_str);
2969 continue;
2970 }
2971
2972 r = in_addr_from_string_auto(route_str, &family, &route_dst);
2973 if (r < 0) {
2974 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
2975 continue;
2976 }
2977
2978 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
2979 if (r < 0)
2980 return log_link_error_errno(link, r, "Failed to add route: %m");
2981
2982 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
2983 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
2984 0, route_expire_handler, route);
2985 if (r < 0)
2986 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
2987 }
2988
2989 route->lifetime = lifetime;
2990 sd_event_source_unref(route->expire);
2991 route->expire = TAKE_PTR(expire);
2992 }
2993 }
2994
2995 if (dhcp4_address) {
2996 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
2997 if (r < 0) {
2998 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
2999 goto dhcp4_address_fail;
3000 }
3001
3002 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3003 if (r < 0)
3004 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3005
3006 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3007 if (r < 0)
3008 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3009 }
3010
3011 dhcp4_address_fail:
3012
3013 if (ipv4ll_address) {
3014 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3015 if (r < 0) {
3016 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3017 goto ipv4ll_address_fail;
3018 }
3019
3020 r = sd_ipv4ll_new(&link->ipv4ll);
3021 if (r < 0)
3022 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3023
3024 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3025 if (r < 0)
3026 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3027 }
3028
3029 ipv4ll_address_fail:
3030
3031 return 0;
3032 }
3033
3034 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3035 Link *link;
3036 _cleanup_(udev_device_unrefp) struct udev_device *device = NULL;
3037 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3038 int r;
3039
3040 assert(m);
3041 assert(m->rtnl);
3042 assert(message);
3043 assert(ret);
3044
3045 r = link_new(m, message, ret);
3046 if (r < 0)
3047 return r;
3048
3049 link = *ret;
3050
3051 log_link_debug(link, "Link %d added", link->ifindex);
3052
3053 r = link_load(link);
3054 if (r < 0)
3055 return r;
3056
3057 if (detect_container() <= 0) {
3058 /* not in a container, udev will be around */
3059 sprintf(ifindex_str, "n%d", link->ifindex);
3060 device = udev_device_new_from_device_id(m->udev, ifindex_str);
3061 if (!device) {
3062 r = log_link_warning_errno(link, errno, "Could not find udev device: %m");
3063 goto failed;
3064 }
3065
3066 if (udev_device_get_is_initialized(device) <= 0) {
3067 /* not yet ready */
3068 log_link_debug(link, "link pending udev initialization...");
3069 return 0;
3070 }
3071
3072 r = link_initialized(link, device);
3073 if (r < 0)
3074 goto failed;
3075 } else {
3076 /* we are calling a callback directly, so must take a ref */
3077 link_ref(link);
3078
3079 r = link_initialized_and_synced(m->rtnl, NULL, link);
3080 if (r < 0)
3081 goto failed;
3082 }
3083
3084 return 0;
3085 failed:
3086 link_enter_failed(link);
3087 return r;
3088 }
3089
3090 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3091 int r;
3092
3093 assert(link);
3094
3095 log_link_info(link, "Gained IPv6LL");
3096
3097 link->ipv6ll_address = *address;
3098 link_check_ready(link);
3099
3100 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3101 r = link_acquire_ipv6_conf(link);
3102 if (r < 0) {
3103 link_enter_failed(link);
3104 return r;
3105 }
3106 }
3107
3108 return 0;
3109 }
3110
3111 static int link_carrier_gained(Link *link) {
3112 int r;
3113
3114 assert(link);
3115
3116 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3117 r = link_acquire_conf(link);
3118 if (r < 0) {
3119 link_enter_failed(link);
3120 return r;
3121 }
3122
3123 r = link_enter_set_addresses(link);
3124 if (r < 0)
3125 return r;
3126 }
3127
3128 r = link_handle_bound_by_list(link);
3129 if (r < 0)
3130 return r;
3131
3132 return 0;
3133 }
3134
3135 static int link_carrier_lost(Link *link) {
3136 int r;
3137
3138 assert(link);
3139
3140 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3141 setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3142 configuration and stop the clients as well. */
3143 if (link->setting_mtu)
3144 return 0;
3145
3146 r = link_stop_clients(link);
3147 if (r < 0) {
3148 link_enter_failed(link);
3149 return r;
3150 }
3151
3152 if (link_dhcp4_server_enabled(link))
3153 (void) sd_dhcp_server_stop(link->dhcp_server);
3154
3155 r = link_drop_config(link);
3156 if (r < 0)
3157 return r;
3158
3159 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3160 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3161 r = link_drop_foreign_config(link);
3162 if (r < 0)
3163 return r;
3164 }
3165
3166 r = link_handle_bound_by_list(link);
3167 if (r < 0)
3168 return r;
3169
3170 return 0;
3171 }
3172
3173 int link_carrier_reset(Link *link) {
3174 int r;
3175
3176 assert(link);
3177
3178 if (link_has_carrier(link)) {
3179 r = link_carrier_lost(link);
3180 if (r < 0)
3181 return r;
3182
3183 r = link_carrier_gained(link);
3184 if (r < 0)
3185 return r;
3186
3187 log_link_info(link, "Reset carrier");
3188 }
3189
3190 return 0;
3191 }
3192
3193 int link_update(Link *link, sd_netlink_message *m) {
3194 struct ether_addr mac;
3195 const char *ifname;
3196 uint32_t mtu;
3197 bool had_carrier, carrier_gained, carrier_lost;
3198 int r;
3199
3200 assert(link);
3201 assert(link->ifname);
3202 assert(m);
3203
3204 if (link->state == LINK_STATE_LINGER) {
3205 link_ref(link);
3206 log_link_info(link, "Link readded");
3207 link_set_state(link, LINK_STATE_ENSLAVING);
3208
3209 r = link_new_carrier_maps(link);
3210 if (r < 0)
3211 return r;
3212 }
3213
3214 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3215 if (r >= 0 && !streq(ifname, link->ifname)) {
3216 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3217
3218 if (link->state == LINK_STATE_PENDING) {
3219 r = free_and_strdup(&link->ifname, ifname);
3220 if (r < 0)
3221 return r;
3222 } else {
3223 Manager *manager = link->manager;
3224
3225 link_drop(link);
3226 r = link_add(manager, m, &link);
3227 if (r < 0)
3228 return r;
3229 }
3230 }
3231
3232 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3233 if (r >= 0 && mtu > 0) {
3234 link->mtu = mtu;
3235 if (link->original_mtu == 0) {
3236 link->original_mtu = mtu;
3237 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3238 }
3239
3240 if (link->dhcp_client) {
3241 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3242 link->mtu);
3243 if (r < 0) {
3244 log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3245 return r;
3246 }
3247 }
3248
3249 if (link->radv) {
3250 r = sd_radv_set_mtu(link->radv, link->mtu);
3251 if (r < 0)
3252 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3253 }
3254 }
3255
3256 /* The kernel may broadcast NEWLINK messages without the MAC address
3257 set, simply ignore them. */
3258 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3259 if (r >= 0) {
3260 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3261 ETH_ALEN)) {
3262
3263 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3264 ETH_ALEN);
3265
3266 log_link_debug(link, "MAC address: "
3267 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3268 mac.ether_addr_octet[0],
3269 mac.ether_addr_octet[1],
3270 mac.ether_addr_octet[2],
3271 mac.ether_addr_octet[3],
3272 mac.ether_addr_octet[4],
3273 mac.ether_addr_octet[5]);
3274
3275 if (link->ipv4ll) {
3276 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3277 if (r < 0)
3278 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3279 }
3280
3281 if (link->dhcp_client) {
3282 r = sd_dhcp_client_set_mac(link->dhcp_client,
3283 (const uint8_t *) &link->mac,
3284 sizeof (link->mac),
3285 ARPHRD_ETHER);
3286 if (r < 0)
3287 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3288
3289 switch (link->network->dhcp_client_identifier) {
3290 case DHCP_CLIENT_ID_DUID: {
3291 const DUID *duid = link_duid(link);
3292
3293 r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
3294 link->network->iaid,
3295 duid->type,
3296 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3297 duid->raw_data_len);
3298 if (r < 0)
3299 return log_link_warning_errno(link, r, "Could not update DUID/IAID in DHCP client: %m");
3300 break;
3301 }
3302 case DHCP_CLIENT_ID_DUID_ONLY: {
3303 const DUID *duid = link_duid(link);
3304
3305 r = sd_dhcp_client_set_duid(link->dhcp_client,
3306 duid->type,
3307 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3308 duid->raw_data_len);
3309 if (r < 0)
3310 return log_link_warning_errno(link, r, "Could not update DUID in DHCP client: %m");
3311 break;
3312 }
3313 case DHCP_CLIENT_ID_MAC:
3314 r = sd_dhcp_client_set_client_id(link->dhcp_client,
3315 ARPHRD_ETHER,
3316 (const uint8_t *)&link->mac,
3317 sizeof(link->mac));
3318 if (r < 0)
3319 return log_link_warning_errno(link, r, "Could not update MAC client id in DHCP client: %m");
3320 break;
3321 default:
3322 assert_not_reached("Unknown client identifier type.");
3323 }
3324 }
3325
3326 if (link->dhcp6_client) {
3327 const DUID* duid = link_duid(link);
3328
3329 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3330 (const uint8_t *) &link->mac,
3331 sizeof (link->mac),
3332 ARPHRD_ETHER);
3333 if (r < 0)
3334 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3335
3336 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3337 link->network->iaid);
3338 if (r < 0)
3339 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3340
3341 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3342 duid->type,
3343 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3344 duid->raw_data_len);
3345 if (r < 0)
3346 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3347 }
3348
3349 if (link->radv) {
3350 r = sd_radv_set_mac(link->radv, &link->mac);
3351 if (r < 0)
3352 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3353 }
3354
3355 if (link->ndisc) {
3356 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3357 if (r < 0)
3358 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3359 }
3360 }
3361 }
3362
3363 had_carrier = link_has_carrier(link);
3364
3365 r = link_update_flags(link, m);
3366 if (r < 0)
3367 return r;
3368
3369 r = link_update_lldp(link);
3370 if (r < 0)
3371 return r;
3372
3373 carrier_gained = !had_carrier && link_has_carrier(link);
3374 carrier_lost = had_carrier && !link_has_carrier(link);
3375
3376 if (carrier_gained) {
3377 log_link_info(link, "Gained carrier");
3378
3379 r = link_carrier_gained(link);
3380 if (r < 0)
3381 return r;
3382 } else if (carrier_lost) {
3383 log_link_info(link, "Lost carrier");
3384
3385 r = link_carrier_lost(link);
3386 if (r < 0)
3387 return r;
3388 }
3389
3390 return 0;
3391 }
3392
3393 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3394 bool space = false;
3395 Iterator i;
3396 Link *link;
3397
3398 assert(f);
3399 assert(prefix);
3400
3401 if (hashmap_isempty(h))
3402 return;
3403
3404 fputs(prefix, f);
3405 HASHMAP_FOREACH(link, h, i) {
3406 if (space)
3407 fputc(' ', f);
3408
3409 fprintf(f, "%i", link->ifindex);
3410 space = true;
3411 }
3412
3413 fputc('\n', f);
3414 }
3415
3416 int link_save(Link *link) {
3417 _cleanup_free_ char *temp_path = NULL;
3418 _cleanup_fclose_ FILE *f = NULL;
3419 const char *admin_state, *oper_state;
3420 Address *a;
3421 Route *route;
3422 Iterator i;
3423 int r;
3424
3425 assert(link);
3426 assert(link->state_file);
3427 assert(link->lease_file);
3428 assert(link->manager);
3429
3430 if (link->state == LINK_STATE_LINGER) {
3431 unlink(link->state_file);
3432 return 0;
3433 }
3434
3435 link_lldp_save(link);
3436
3437 admin_state = link_state_to_string(link->state);
3438 assert(admin_state);
3439
3440 oper_state = link_operstate_to_string(link->operstate);
3441 assert(oper_state);
3442
3443 r = fopen_temporary(link->state_file, &f, &temp_path);
3444 if (r < 0)
3445 goto fail;
3446
3447 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
3448 (void) fchmod(fileno(f), 0644);
3449
3450 fprintf(f,
3451 "# This is private data. Do not parse.\n"
3452 "ADMIN_STATE=%s\n"
3453 "OPER_STATE=%s\n",
3454 admin_state, oper_state);
3455
3456 if (link->network) {
3457 bool space;
3458 sd_dhcp6_lease *dhcp6_lease = NULL;
3459 const char *dhcp_domainname = NULL;
3460 char **dhcp6_domains = NULL;
3461 char **dhcp_domains = NULL;
3462 unsigned j;
3463
3464 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3465 yes_no(link->network->required_for_online));
3466
3467 if (link->dhcp6_client) {
3468 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3469 if (r < 0 && r != -ENOMSG)
3470 log_link_debug(link, "No DHCPv6 lease");
3471 }
3472
3473 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3474
3475 fputs("DNS=", f);
3476 space = false;
3477
3478 for (j = 0; j < link->network->n_dns; j++) {
3479 _cleanup_free_ char *b = NULL;
3480
3481 r = in_addr_to_string(link->network->dns[j].family,
3482 &link->network->dns[j].address, &b);
3483 if (r < 0) {
3484 log_debug_errno(r, "Failed to format address, ignoring: %m");
3485 continue;
3486 }
3487
3488 if (space)
3489 fputc(' ', f);
3490 fputs(b, f);
3491 space = true;
3492 }
3493
3494 if (link->network->dhcp_use_dns &&
3495 link->dhcp_lease) {
3496 const struct in_addr *addresses;
3497
3498 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3499 if (r > 0) {
3500 if (space)
3501 fputc(' ', f);
3502 serialize_in_addrs(f, addresses, r);
3503 space = true;
3504 }
3505 }
3506
3507 if (link->network->dhcp_use_dns && dhcp6_lease) {
3508 struct in6_addr *in6_addrs;
3509
3510 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3511 if (r > 0) {
3512 if (space)
3513 fputc(' ', f);
3514 serialize_in6_addrs(f, in6_addrs, r);
3515 space = true;
3516 }
3517 }
3518
3519 /* Make sure to flush out old entries before we use the NDISC data */
3520 ndisc_vacuum(link);
3521
3522 if (link->network->dhcp_use_dns && link->ndisc_rdnss) {
3523 NDiscRDNSS *dd;
3524
3525 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3526 if (space)
3527 fputc(' ', f);
3528
3529 serialize_in6_addrs(f, &dd->address, 1);
3530 space = true;
3531 }
3532 }
3533
3534 fputc('\n', f);
3535
3536 fputs("NTP=", f);
3537 space = false;
3538 fputstrv(f, link->network->ntp, NULL, &space);
3539
3540 if (link->network->dhcp_use_ntp &&
3541 link->dhcp_lease) {
3542 const struct in_addr *addresses;
3543
3544 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3545 if (r > 0) {
3546 if (space)
3547 fputc(' ', f);
3548 serialize_in_addrs(f, addresses, r);
3549 space = true;
3550 }
3551 }
3552
3553 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3554 struct in6_addr *in6_addrs;
3555 char **hosts;
3556
3557 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3558 &in6_addrs);
3559 if (r > 0) {
3560 if (space)
3561 fputc(' ', f);
3562 serialize_in6_addrs(f, in6_addrs, r);
3563 space = true;
3564 }
3565
3566 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3567 if (r > 0)
3568 fputstrv(f, hosts, NULL, &space);
3569 }
3570
3571 fputc('\n', f);
3572
3573 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3574 if (link->dhcp_lease) {
3575 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3576 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3577 }
3578 if (dhcp6_lease)
3579 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3580 }
3581
3582 fputs("DOMAINS=", f);
3583 space = false;
3584 fputstrv(f, link->network->search_domains, NULL, &space);
3585
3586 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3587 NDiscDNSSL *dd;
3588
3589 if (dhcp_domainname)
3590 fputs_with_space(f, dhcp_domainname, NULL, &space);
3591 if (dhcp_domains)
3592 fputstrv(f, dhcp_domains, NULL, &space);
3593 if (dhcp6_domains)
3594 fputstrv(f, dhcp6_domains, NULL, &space);
3595
3596 SET_FOREACH(dd, link->ndisc_dnssl, i)
3597 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3598 }
3599
3600 fputc('\n', f);
3601
3602 fputs("ROUTE_DOMAINS=", f);
3603 space = false;
3604 fputstrv(f, link->network->route_domains, NULL, &space);
3605
3606 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3607 NDiscDNSSL *dd;
3608
3609 if (dhcp_domainname)
3610 fputs_with_space(f, dhcp_domainname, NULL, &space);
3611 if (dhcp_domains)
3612 fputstrv(f, dhcp_domains, NULL, &space);
3613 if (dhcp6_domains)
3614 fputstrv(f, dhcp6_domains, NULL, &space);
3615
3616 SET_FOREACH(dd, link->ndisc_dnssl, i)
3617 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3618 }
3619
3620 fputc('\n', f);
3621
3622 fprintf(f, "LLMNR=%s\n",
3623 resolve_support_to_string(link->network->llmnr));
3624 fprintf(f, "MDNS=%s\n",
3625 resolve_support_to_string(link->network->mdns));
3626
3627 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3628 fprintf(f, "DNSSEC=%s\n",
3629 dnssec_mode_to_string(link->network->dnssec_mode));
3630
3631 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3632 const char *n;
3633
3634 fputs("DNSSEC_NTA=", f);
3635 space = false;
3636 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3637 fputs_with_space(f, n, NULL, &space);
3638 fputc('\n', f);
3639 }
3640
3641 fputs("ADDRESSES=", f);
3642 space = false;
3643 SET_FOREACH(a, link->addresses, i) {
3644 _cleanup_free_ char *address_str = NULL;
3645
3646 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3647 if (r < 0)
3648 goto fail;
3649
3650 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3651 space = true;
3652 }
3653 fputc('\n', f);
3654
3655 fputs("ROUTES=", f);
3656 space = false;
3657 SET_FOREACH(route, link->routes, i) {
3658 _cleanup_free_ char *route_str = NULL;
3659
3660 r = in_addr_to_string(route->family, &route->dst, &route_str);
3661 if (r < 0)
3662 goto fail;
3663
3664 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
3665 space ? " " : "", route_str,
3666 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3667 space = true;
3668 }
3669
3670 fputc('\n', f);
3671 }
3672
3673 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3674 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3675
3676 if (link->dhcp_lease) {
3677 struct in_addr address;
3678 const char *tz = NULL;
3679
3680 assert(link->network);
3681
3682 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3683 if (r >= 0)
3684 fprintf(f, "TIMEZONE=%s\n", tz);
3685
3686 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3687 if (r >= 0) {
3688 fputs("DHCP4_ADDRESS=", f);
3689 serialize_in_addrs(f, &address, 1);
3690 fputc('\n', f);
3691 }
3692
3693 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3694 if (r < 0)
3695 goto fail;
3696
3697 fprintf(f,
3698 "DHCP_LEASE=%s\n",
3699 link->lease_file);
3700 } else
3701 unlink(link->lease_file);
3702
3703 if (link->ipv4ll) {
3704 struct in_addr address;
3705
3706 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3707 if (r >= 0) {
3708 fputs("IPV4LL_ADDRESS=", f);
3709 serialize_in_addrs(f, &address, 1);
3710 fputc('\n', f);
3711 }
3712 }
3713
3714 r = fflush_and_check(f);
3715 if (r < 0)
3716 goto fail;
3717
3718 if (rename(temp_path, link->state_file) < 0) {
3719 r = -errno;
3720 goto fail;
3721 }
3722
3723 return 0;
3724
3725 fail:
3726 (void) unlink(link->state_file);
3727 if (temp_path)
3728 (void) unlink(temp_path);
3729
3730 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3731 }
3732
3733 /* The serialized state in /run is no longer up-to-date. */
3734 void link_dirty(Link *link) {
3735 int r;
3736
3737 assert(link);
3738
3739 /* mark manager dirty as link is dirty */
3740 manager_dirty(link->manager);
3741
3742 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3743 if (r < 0)
3744 /* allocation errors are ignored */
3745 return;
3746
3747 r = set_put(link->manager->dirty_links, link);
3748 if (r <= 0)
3749 /* don't take another ref if the link was already dirty */
3750 return;
3751
3752 link_ref(link);
3753 }
3754
3755 /* The serialized state in /run is up-to-date */
3756 void link_clean(Link *link) {
3757 assert(link);
3758 assert(link->manager);
3759
3760 set_remove(link->manager->dirty_links, link);
3761 link_unref(link);
3762 }
3763
3764 static const char* const link_state_table[_LINK_STATE_MAX] = {
3765 [LINK_STATE_PENDING] = "pending",
3766 [LINK_STATE_ENSLAVING] = "configuring",
3767 [LINK_STATE_SETTING_ADDRESSES] = "configuring",
3768 [LINK_STATE_SETTING_ROUTES] = "configuring",
3769 [LINK_STATE_CONFIGURED] = "configured",
3770 [LINK_STATE_UNMANAGED] = "unmanaged",
3771 [LINK_STATE_FAILED] = "failed",
3772 [LINK_STATE_LINGER] = "linger",
3773 };
3774
3775 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
3776
3777 static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
3778 [LINK_OPERSTATE_OFF] = "off",
3779 [LINK_OPERSTATE_NO_CARRIER] = "no-carrier",
3780 [LINK_OPERSTATE_DORMANT] = "dormant",
3781 [LINK_OPERSTATE_CARRIER] = "carrier",
3782 [LINK_OPERSTATE_DEGRADED] = "degraded",
3783 [LINK_OPERSTATE_ROUTABLE] = "routable",
3784 };
3785
3786 DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
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