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[thirdparty/systemd.git] / src / network / networkd-link.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <netinet/ether.h>
4 #include <linux/if.h>
5 #include <linux/can/netlink.h>
6 #include <unistd.h>
7
8 #include "alloc-util.h"
9 #include "bus-util.h"
10 #include "dhcp-identifier.h"
11 #include "dhcp-lease-internal.h"
12 #include "env-file.h"
13 #include "fd-util.h"
14 #include "fileio.h"
15 #include "missing_network.h"
16 #include "netdev/vrf.h"
17 #include "netlink-util.h"
18 #include "network-internal.h"
19 #include "networkd-ipv6-proxy-ndp.h"
20 #include "networkd-lldp-tx.h"
21 #include "networkd-manager.h"
22 #include "networkd-ndisc.h"
23 #include "networkd-neighbor.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 "strv.h"
31 #include "sysctl-util.h"
32 #include "tmpfile-util.h"
33 #include "udev-util.h"
34 #include "util.h"
35 #include "virt.h"
36
37 uint32_t link_get_vrf_table(Link *link) {
38 return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
39 }
40
41 uint32_t link_get_dhcp_route_table(Link *link) {
42 /* When the interface is part of an VRF use the VRFs routing table, unless
43 * another table is explicitly specified. */
44 if (link->network->dhcp_route_table_set)
45 return link->network->dhcp_route_table;
46 return link_get_vrf_table(link);
47 }
48
49 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
50 if (link->network->ipv6_accept_ra_route_table_set)
51 return link->network->ipv6_accept_ra_route_table;
52 return link_get_vrf_table(link);
53 }
54
55 DUID* link_get_duid(Link *link) {
56 if (link->network->duid.type != _DUID_TYPE_INVALID)
57 return &link->network->duid;
58 else
59 return &link->manager->duid;
60 }
61
62 static bool link_dhcp6_enabled(Link *link) {
63 assert(link);
64
65 if (!socket_ipv6_is_supported())
66 return false;
67
68 if (link->flags & IFF_LOOPBACK)
69 return false;
70
71 if (!link->network)
72 return false;
73
74 if (link->network->bond)
75 return false;
76
77 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
78 return false;
79
80 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
81 }
82
83 static bool link_dhcp4_enabled(Link *link) {
84 assert(link);
85
86 if (link->flags & IFF_LOOPBACK)
87 return false;
88
89 if (!link->network)
90 return false;
91
92 if (link->network->bond)
93 return false;
94
95 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
96 }
97
98 static bool link_dhcp4_server_enabled(Link *link) {
99 assert(link);
100
101 if (link->flags & IFF_LOOPBACK)
102 return false;
103
104 if (!link->network)
105 return false;
106
107 if (link->network->bond)
108 return false;
109
110 return link->network->dhcp_server;
111 }
112
113 static bool link_ipv4ll_enabled(Link *link) {
114 assert(link);
115
116 if (link->flags & IFF_LOOPBACK)
117 return false;
118
119 if (!link->network)
120 return false;
121
122 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard"))
123 return false;
124
125 if (link->network->bond)
126 return false;
127
128 return link->network->link_local & ADDRESS_FAMILY_IPV4;
129 }
130
131 static bool link_ipv6ll_enabled(Link *link) {
132 assert(link);
133
134 if (!socket_ipv6_is_supported())
135 return false;
136
137 if (link->flags & IFF_LOOPBACK)
138 return false;
139
140 if (!link->network)
141 return false;
142
143 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard"))
144 return false;
145
146 if (link->network->bond)
147 return false;
148
149 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
150 return false;
151
152 return link->network->link_local & ADDRESS_FAMILY_IPV6;
153 }
154
155 static bool link_ipv6_enabled(Link *link) {
156 assert(link);
157
158 if (!socket_ipv6_is_supported())
159 return false;
160
161 if (link->network->bond)
162 return false;
163
164 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
165 return false;
166
167 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
168 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
169 }
170
171 static bool link_radv_enabled(Link *link) {
172 assert(link);
173
174 if (!link_ipv6ll_enabled(link))
175 return false;
176
177 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
178 }
179
180 static bool link_lldp_rx_enabled(Link *link) {
181 assert(link);
182
183 if (link->flags & IFF_LOOPBACK)
184 return false;
185
186 if (link->iftype != ARPHRD_ETHER)
187 return false;
188
189 if (!link->network)
190 return false;
191
192 /* LLDP should be handled on bridge slaves as those have a direct
193 * connection to their peers not on the bridge master. Linux doesn't
194 * even (by default) forward lldp packets to the bridge master.*/
195 if (streq_ptr("bridge", link->kind))
196 return false;
197
198 return link->network->lldp_mode != LLDP_MODE_NO;
199 }
200
201 static bool link_lldp_emit_enabled(Link *link) {
202 assert(link);
203
204 if (link->flags & IFF_LOOPBACK)
205 return false;
206
207 if (link->iftype != ARPHRD_ETHER)
208 return false;
209
210 if (!link->network)
211 return false;
212
213 return link->network->lldp_emit != LLDP_EMIT_NO;
214 }
215
216 static bool link_ipv4_forward_enabled(Link *link) {
217 assert(link);
218
219 if (link->flags & IFF_LOOPBACK)
220 return false;
221
222 if (!link->network)
223 return false;
224
225 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
226 return false;
227
228 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
229 }
230
231 static bool link_ipv6_forward_enabled(Link *link) {
232 assert(link);
233
234 if (!socket_ipv6_is_supported())
235 return false;
236
237 if (link->flags & IFF_LOOPBACK)
238 return false;
239
240 if (!link->network)
241 return false;
242
243 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
244 return false;
245
246 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
247 return false;
248
249 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
250 }
251
252 static bool link_proxy_arp_enabled(Link *link) {
253 assert(link);
254
255 if (link->flags & IFF_LOOPBACK)
256 return false;
257
258 if (!link->network)
259 return false;
260
261 if (link->network->proxy_arp < 0)
262 return false;
263
264 return true;
265 }
266
267 static bool link_ipv6_accept_ra_enabled(Link *link) {
268 assert(link);
269
270 if (!socket_ipv6_is_supported())
271 return false;
272
273 if (link->flags & IFF_LOOPBACK)
274 return false;
275
276 if (!link->network)
277 return false;
278
279 if (!link_ipv6ll_enabled(link))
280 return false;
281
282 /* If unset use system default (enabled if local forwarding is disabled.
283 * disabled if local forwarding is enabled).
284 * If set, ignore or enforce RA independent of local forwarding state.
285 */
286 if (link->network->ipv6_accept_ra < 0)
287 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
288 return !link_ipv6_forward_enabled(link);
289 else if (link->network->ipv6_accept_ra > 0)
290 /* accept RA even if ip_forward is enabled */
291 return true;
292 else
293 /* ignore RA */
294 return false;
295 }
296
297 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
298 assert(link);
299
300 if (!socket_ipv6_is_supported())
301 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
302
303 if (link->flags & IFF_LOOPBACK)
304 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
305
306 if (!link->network)
307 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
308
309 return link->network->ipv6_privacy_extensions;
310 }
311
312 static int link_enable_ipv6(Link *link) {
313 bool disabled;
314 int r;
315
316 if (link->flags & IFF_LOOPBACK)
317 return 0;
318
319 disabled = !link_ipv6_enabled(link);
320
321 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", disabled);
322 if (r < 0)
323 log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m",
324 enable_disable(!disabled), link->ifname);
325 else
326 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
327
328 return 0;
329 }
330
331 static bool link_is_enslaved(Link *link) {
332 if (link->flags & IFF_SLAVE)
333 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
334 return true;
335
336 if (!link->enslaved_raw)
337 return false;
338
339 if (!link->network)
340 return false;
341
342 if (link->network->bridge)
343 /* TODO: support the case when link is not managed by networkd. */
344 return true;
345
346 return false;
347 }
348
349 static void link_update_master_operstate(Link *link, NetDev *netdev) {
350 Link *master;
351
352 if (!netdev)
353 return;
354
355 if (link_get(link->manager, netdev->ifindex, &master) < 0)
356 return;
357
358 link_update_operstate(master, true);
359 }
360
361 void link_update_operstate(Link *link, bool also_update_master) {
362 LinkOperationalState operstate;
363 Iterator i;
364
365 assert(link);
366
367 if (link->kernel_operstate == IF_OPER_DORMANT)
368 operstate = LINK_OPERSTATE_DORMANT;
369 else if (link_has_carrier(link)) {
370 Address *address;
371 uint8_t scope = RT_SCOPE_NOWHERE;
372
373 /* if we have carrier, check what addresses we have */
374 SET_FOREACH(address, link->addresses, i) {
375 if (!address_is_ready(address))
376 continue;
377
378 if (address->scope < scope)
379 scope = address->scope;
380 }
381
382 /* for operstate we also take foreign addresses into account */
383 SET_FOREACH(address, link->addresses_foreign, i) {
384 if (!address_is_ready(address))
385 continue;
386
387 if (address->scope < scope)
388 scope = address->scope;
389 }
390
391 if (scope < RT_SCOPE_SITE)
392 /* universally accessible addresses found */
393 operstate = LINK_OPERSTATE_ROUTABLE;
394 else if (scope < RT_SCOPE_HOST)
395 /* only link or site local addresses found */
396 operstate = LINK_OPERSTATE_DEGRADED;
397 else
398 /* no useful addresses found */
399 operstate = LINK_OPERSTATE_CARRIER;
400 } else if (link->flags & IFF_UP)
401 operstate = LINK_OPERSTATE_NO_CARRIER;
402 else
403 operstate = LINK_OPERSTATE_OFF;
404
405 if (IN_SET(operstate, LINK_OPERSTATE_DEGRADED, LINK_OPERSTATE_CARRIER) &&
406 link_is_enslaved(link))
407 operstate = LINK_OPERSTATE_ENSLAVED;
408
409 if (operstate >= LINK_OPERSTATE_CARRIER) {
410 Link *slave;
411
412 HASHMAP_FOREACH(slave, link->slaves, i) {
413 link_update_operstate(slave, false);
414
415 if (slave->operstate < LINK_OPERSTATE_CARRIER)
416 operstate = LINK_OPERSTATE_DEGRADED_CARRIER;
417 }
418 }
419
420 if (link->operstate != operstate) {
421 link->operstate = operstate;
422 link_send_changed(link, "OperationalState", NULL);
423 link_dirty(link);
424 }
425
426 if (also_update_master && link->network) {
427 link_update_master_operstate(link, link->network->bond);
428 link_update_master_operstate(link, link->network->bridge);
429 }
430 }
431
432 #define FLAG_STRING(string, flag, old, new) \
433 (((old ^ new) & flag) \
434 ? ((old & flag) ? (" -" string) : (" +" string)) \
435 : "")
436
437 static int link_update_flags(Link *link, sd_netlink_message *m) {
438 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
439 uint8_t operstate;
440 int r;
441
442 assert(link);
443
444 r = sd_rtnl_message_link_get_flags(m, &flags);
445 if (r < 0)
446 return log_link_warning_errno(link, r, "Could not get link flags: %m");
447
448 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
449 if (r < 0)
450 /* if we got a message without operstate, take it to mean
451 the state was unchanged */
452 operstate = link->kernel_operstate;
453
454 if ((link->flags == flags) && (link->kernel_operstate == operstate))
455 return 0;
456
457 if (link->flags != flags) {
458 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",
459 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
460 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
461 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
462 FLAG_STRING("UP", IFF_UP, link->flags, flags),
463 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
464 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
465 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
466 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
467 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
468 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
469 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
470 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
471 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
472 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
473 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
474 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
475 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
476 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
477 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
478
479 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
480 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
481 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
482 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
483 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
484 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
485 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
486 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
487
488 /* link flags are currently at most 18 bits, let's align to
489 * printing 20 */
490 if (unknown_flags_added)
491 log_link_debug(link,
492 "Unknown link flags gained: %#.5x (ignoring)",
493 unknown_flags_added);
494
495 if (unknown_flags_removed)
496 log_link_debug(link,
497 "Unknown link flags lost: %#.5x (ignoring)",
498 unknown_flags_removed);
499 }
500
501 link->flags = flags;
502 link->kernel_operstate = operstate;
503
504 link_update_operstate(link, true);
505
506 return 0;
507 }
508
509 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_unref);
510
511 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
512 _cleanup_(link_unrefp) Link *link = NULL;
513 uint16_t type;
514 const char *ifname, *kind = NULL;
515 int r, ifindex;
516 unsigned short iftype;
517
518 assert(manager);
519 assert(message);
520 assert(ret);
521
522 /* check for link kind */
523 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
524 if (r == 0) {
525 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
526 r = sd_netlink_message_exit_container(message);
527 if (r < 0)
528 return r;
529 }
530
531 r = sd_netlink_message_get_type(message, &type);
532 if (r < 0)
533 return r;
534 else if (type != RTM_NEWLINK)
535 return -EINVAL;
536
537 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
538 if (r < 0)
539 return r;
540 else if (ifindex <= 0)
541 return -EINVAL;
542
543 r = sd_rtnl_message_link_get_type(message, &iftype);
544 if (r < 0)
545 return r;
546
547 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
548 if (r < 0)
549 return r;
550
551 link = new(Link, 1);
552 if (!link)
553 return -ENOMEM;
554
555 *link = (Link) {
556 .n_ref = 1,
557 .manager = manager,
558 .state = LINK_STATE_PENDING,
559 .rtnl_extended_attrs = true,
560 .ifindex = ifindex,
561 .iftype = iftype,
562 };
563
564 link->ifname = strdup(ifname);
565 if (!link->ifname)
566 return -ENOMEM;
567
568 if (kind) {
569 link->kind = strdup(kind);
570 if (!link->kind)
571 return -ENOMEM;
572 }
573
574 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
575 if (r < 0)
576 log_link_debug_errno(link, r, "New device has no master, continuing without");
577
578 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
579 if (r < 0)
580 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
581
582 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
583 return -ENOMEM;
584
585 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
586 return -ENOMEM;
587
588 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
589 return -ENOMEM;
590
591 r = hashmap_ensure_allocated(&manager->links, NULL);
592 if (r < 0)
593 return r;
594
595 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
596 if (r < 0)
597 return r;
598
599 r = link_update_flags(link, message);
600 if (r < 0)
601 return r;
602
603 *ret = TAKE_PTR(link);
604
605 return 0;
606 }
607
608 static void link_detach_from_manager(Link *link) {
609 if (!link || !link->manager)
610 return;
611
612 hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex));
613 set_remove(link->manager->links_requesting_uuid, link);
614 link_clean(link);
615 }
616
617 static Link *link_free(Link *link) {
618 Link *carrier, *master;
619 Address *address;
620 Route *route;
621 Iterator i;
622
623 assert(link);
624
625 while ((route = set_first(link->routes)))
626 route_free(route);
627
628 while ((route = set_first(link->routes_foreign)))
629 route_free(route);
630
631 link->routes = set_free(link->routes);
632 link->routes_foreign = set_free(link->routes_foreign);
633
634 while ((address = set_first(link->addresses)))
635 address_free(address);
636
637 while ((address = set_first(link->addresses_foreign)))
638 address_free(address);
639
640 link->addresses = set_free(link->addresses);
641 link->addresses_foreign = set_free(link->addresses_foreign);
642
643 while ((address = link->pool_addresses)) {
644 LIST_REMOVE(addresses, link->pool_addresses, address);
645 address_free(address);
646 }
647
648 sd_dhcp_server_unref(link->dhcp_server);
649 sd_dhcp_client_unref(link->dhcp_client);
650 sd_dhcp_lease_unref(link->dhcp_lease);
651
652 link_lldp_emit_stop(link);
653
654 free(link->lease_file);
655
656 sd_lldp_unref(link->lldp);
657 free(link->lldp_file);
658
659 ndisc_flush(link);
660
661 sd_ipv4ll_unref(link->ipv4ll);
662 sd_dhcp6_client_unref(link->dhcp6_client);
663 sd_ndisc_unref(link->ndisc);
664 sd_radv_unref(link->radv);
665
666 link_detach_from_manager(link);
667
668 free(link->ifname);
669
670 free(link->kind);
671
672 (void) unlink(link->state_file);
673 free(link->state_file);
674
675 sd_device_unref(link->sd_device);
676
677 HASHMAP_FOREACH (carrier, link->bound_to_links, i)
678 hashmap_remove(link->bound_to_links, INT_TO_PTR(carrier->ifindex));
679 hashmap_free(link->bound_to_links);
680
681 HASHMAP_FOREACH (carrier, link->bound_by_links, i)
682 hashmap_remove(link->bound_by_links, INT_TO_PTR(carrier->ifindex));
683 hashmap_free(link->bound_by_links);
684
685 hashmap_free(link->slaves);
686
687 if (link->network) {
688 if (link->network->bond &&
689 link_get(link->manager, link->network->bond->ifindex, &master) >= 0)
690 (void) hashmap_remove(master->slaves, INT_TO_PTR(link->ifindex));
691
692 if (link->network->bridge &&
693 link_get(link->manager, link->network->bridge->ifindex, &master) >= 0)
694 (void) hashmap_remove(master->slaves, INT_TO_PTR(link->ifindex));
695 }
696
697 return mfree(link);
698 }
699
700 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
701
702 int link_get(Manager *m, int ifindex, Link **ret) {
703 Link *link;
704
705 assert(m);
706 assert(ifindex);
707 assert(ret);
708
709 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
710 if (!link)
711 return -ENODEV;
712
713 *ret = link;
714
715 return 0;
716 }
717
718 static void link_set_state(Link *link, LinkState state) {
719 assert(link);
720
721 if (link->state == state)
722 return;
723
724 link->state = state;
725
726 link_send_changed(link, "AdministrativeState", NULL);
727 }
728
729 static void link_enter_unmanaged(Link *link) {
730 assert(link);
731
732 log_link_debug(link, "Unmanaged");
733
734 link_set_state(link, LINK_STATE_UNMANAGED);
735
736 link_dirty(link);
737 }
738
739 static int link_stop_clients(Link *link) {
740 int r = 0, k;
741
742 assert(link);
743 assert(link->manager);
744 assert(link->manager->event);
745
746 if (link->dhcp_client) {
747 k = sd_dhcp_client_stop(link->dhcp_client);
748 if (k < 0)
749 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
750 }
751
752 if (link->ipv4ll) {
753 k = sd_ipv4ll_stop(link->ipv4ll);
754 if (k < 0)
755 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
756 }
757
758 if (link->dhcp6_client) {
759 k = sd_dhcp6_client_stop(link->dhcp6_client);
760 if (k < 0)
761 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
762 }
763
764 if (link->ndisc) {
765 k = sd_ndisc_stop(link->ndisc);
766 if (k < 0)
767 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
768 }
769
770 if (link->radv) {
771 k = sd_radv_stop(link->radv);
772 if (k < 0)
773 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
774 }
775
776 link_lldp_emit_stop(link);
777 return r;
778 }
779
780 void link_enter_failed(Link *link) {
781 assert(link);
782
783 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
784 return;
785
786 log_link_warning(link, "Failed");
787
788 link_set_state(link, LINK_STATE_FAILED);
789
790 link_stop_clients(link);
791
792 link_dirty(link);
793 }
794
795 static Address* link_find_dhcp_server_address(Link *link) {
796 Address *address;
797
798 assert(link);
799 assert(link->network);
800
801 /* The first statically configured address if there is any */
802 LIST_FOREACH(addresses, address, link->network->static_addresses) {
803
804 if (address->family != AF_INET)
805 continue;
806
807 if (in_addr_is_null(address->family, &address->in_addr))
808 continue;
809
810 return address;
811 }
812
813 /* If that didn't work, find a suitable address we got from the pool */
814 LIST_FOREACH(addresses, address, link->pool_addresses) {
815 if (address->family != AF_INET)
816 continue;
817
818 return address;
819 }
820
821 return NULL;
822 }
823
824 static int link_join_netdevs_after_configured(Link *link) {
825 NetDev *netdev;
826 Iterator i;
827 int r;
828
829 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
830 if (netdev->ifindex > 0)
831 /* Assume already enslaved. */
832 continue;
833
834 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
835 continue;
836
837 log_struct(LOG_DEBUG,
838 LOG_LINK_INTERFACE(link),
839 LOG_NETDEV_INTERFACE(netdev),
840 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
841
842 r = netdev_join(netdev, link, NULL);
843 if (r < 0)
844 return log_struct_errno(LOG_WARNING, r,
845 LOG_LINK_INTERFACE(link),
846 LOG_NETDEV_INTERFACE(netdev),
847 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
848 }
849
850 return 0;
851 }
852
853 static void link_enter_configured(Link *link) {
854 assert(link);
855 assert(link->network);
856
857 if (link->state != LINK_STATE_CONFIGURING)
858 return;
859
860 log_link_info(link, "Configured");
861
862 link_set_state(link, LINK_STATE_CONFIGURED);
863
864 (void) link_join_netdevs_after_configured(link);
865
866 link_dirty(link);
867 }
868
869 static int link_request_set_routing_policy_rule(Link *link) {
870 RoutingPolicyRule *rule, *rrule = NULL;
871 int r;
872
873 assert(link);
874 assert(link->network);
875
876 link_set_state(link, LINK_STATE_CONFIGURING);
877 link->routing_policy_rules_configured = false;
878
879 LIST_FOREACH(rules, rule, link->network->rules) {
880 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
881 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif,
882 rule->protocol, &rule->sport, &rule->dport, &rrule);
883 if (r == 0) {
884 (void) routing_policy_rule_make_local(link->manager, rrule);
885 continue;
886 }
887
888 r = routing_policy_rule_configure(rule, link, NULL, false);
889 if (r < 0) {
890 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
891 link_enter_failed(link);
892 return r;
893 }
894
895 link->routing_policy_rule_messages++;
896 }
897
898 routing_policy_rule_purge(link->manager, link);
899 if (link->routing_policy_rule_messages == 0) {
900 link->routing_policy_rules_configured = true;
901 link_check_ready(link);
902 } else
903 log_link_debug(link, "Setting routing policy rules");
904
905 return 0;
906 }
907
908 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
909 int r;
910
911 assert(link);
912 assert(link->route_messages > 0);
913 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
914 LINK_STATE_FAILED, LINK_STATE_LINGER));
915
916 link->route_messages--;
917
918 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
919 return 1;
920
921 r = sd_netlink_message_get_errno(m);
922 if (r < 0 && r != -EEXIST)
923 log_link_warning_errno(link, r, "Could not set route: %m");
924
925 if (link->route_messages == 0) {
926 log_link_debug(link, "Routes set");
927 link->static_routes_configured = true;
928 link_check_ready(link);
929 }
930
931 return 1;
932 }
933
934 static int link_request_set_routes(Link *link) {
935 enum {
936 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
937 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
938 _PHASE_MAX
939 } phase;
940 Route *rt;
941 int r;
942
943 assert(link);
944 assert(link->network);
945 assert(link->addresses_configured);
946 assert(link->address_messages == 0);
947 assert(link->state != _LINK_STATE_INVALID);
948
949 link_set_state(link, LINK_STATE_CONFIGURING);
950 link->static_routes_configured = false;
951
952 r = link_request_set_routing_policy_rule(link);
953 if (r < 0)
954 return r;
955
956 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
957 for (phase = 0; phase < _PHASE_MAX; phase++)
958 LIST_FOREACH(routes, rt, link->network->static_routes) {
959
960 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
961 continue;
962
963 r = route_configure(rt, link, route_handler);
964 if (r < 0) {
965 log_link_warning_errno(link, r, "Could not set routes: %m");
966 link_enter_failed(link);
967 return r;
968 }
969
970 link->route_messages++;
971 }
972
973 if (link->route_messages == 0) {
974 link->static_routes_configured = true;
975 link_check_ready(link);
976 } else
977 log_link_debug(link, "Setting routes");
978
979 return 0;
980 }
981
982 void link_check_ready(Link *link) {
983 Address *a;
984 Iterator i;
985
986 assert(link);
987
988 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
989 return;
990
991 if (!link->network)
992 return;
993
994 if (!link->addresses_configured)
995 return;
996
997 if (!link->neighbors_configured)
998 return;
999
1000 SET_FOREACH(a, link->addresses, i)
1001 if (!address_is_ready(a))
1002 return;
1003
1004 if (!link->addresses_ready) {
1005 link->addresses_ready = true;
1006 link_request_set_routes(link);
1007 }
1008
1009 if (!link->static_routes_configured)
1010 return;
1011
1012 if (!link->routing_policy_rules_configured)
1013 return;
1014
1015 if (link_ipv4ll_enabled(link))
1016 if (!link->ipv4ll_address ||
1017 !link->ipv4ll_route)
1018 return;
1019
1020 if (link_ipv6ll_enabled(link) &&
1021 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
1022 return;
1023
1024 if ((link_dhcp4_enabled(link) && !link_dhcp6_enabled(link) &&
1025 !link->dhcp4_configured) ||
1026 (link_dhcp6_enabled(link) && !link_dhcp4_enabled(link) &&
1027 !link->dhcp6_configured) ||
1028 (link_dhcp4_enabled(link) && link_dhcp6_enabled(link) &&
1029 !link->dhcp4_configured && !link->dhcp6_configured))
1030 return;
1031
1032 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
1033 return;
1034
1035 if (link->state != LINK_STATE_CONFIGURED)
1036 link_enter_configured(link);
1037
1038 return;
1039 }
1040
1041 static int link_request_set_neighbors(Link *link) {
1042 Neighbor *neighbor;
1043 int r;
1044
1045 assert(link);
1046 assert(link->network);
1047 assert(link->state != _LINK_STATE_INVALID);
1048
1049 link_set_state(link, LINK_STATE_CONFIGURING);
1050 link->neighbors_configured = false;
1051
1052 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1053 r = neighbor_configure(neighbor, link, NULL);
1054 if (r < 0) {
1055 log_link_warning_errno(link, r, "Could not set neighbor: %m");
1056 link_enter_failed(link);
1057 return r;
1058 }
1059 }
1060
1061 if (link->neighbor_messages == 0) {
1062 link->neighbors_configured = true;
1063 link_check_ready(link);
1064 } else
1065 log_link_debug(link, "Setting neighbors");
1066
1067 return 0;
1068 }
1069
1070 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1071 int r;
1072
1073 assert(rtnl);
1074 assert(m);
1075 assert(link);
1076 assert(link->ifname);
1077 assert(link->address_messages > 0);
1078 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1079 LINK_STATE_FAILED, LINK_STATE_LINGER));
1080
1081 link->address_messages--;
1082
1083 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1084 return 1;
1085
1086 r = sd_netlink_message_get_errno(m);
1087 if (r < 0 && r != -EEXIST)
1088 log_link_warning_errno(link, r, "could not set address: %m");
1089 else if (r >= 0)
1090 manager_rtnl_process_address(rtnl, m, link->manager);
1091
1092 if (link->address_messages == 0) {
1093 log_link_debug(link, "Addresses set");
1094 link->addresses_configured = true;
1095 link_check_ready(link);
1096 }
1097
1098 return 1;
1099 }
1100
1101 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1102 _cleanup_free_ struct in_addr *addresses = NULL;
1103 size_t n_addresses = 0, n_allocated = 0;
1104 unsigned i;
1105
1106 log_debug("Copying DNS server information from %s", link->ifname);
1107
1108 if (!link->network)
1109 return 0;
1110
1111 for (i = 0; i < link->network->n_dns; i++) {
1112 struct in_addr ia;
1113
1114 /* Only look for IPv4 addresses */
1115 if (link->network->dns[i].family != AF_INET)
1116 continue;
1117
1118 ia = link->network->dns[i].address.in;
1119
1120 /* Never propagate obviously borked data */
1121 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1122 continue;
1123
1124 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1125 return log_oom();
1126
1127 addresses[n_addresses++] = ia;
1128 }
1129
1130 if (link->network->dhcp_use_dns && link->dhcp_lease) {
1131 const struct in_addr *da = NULL;
1132 int j, n;
1133
1134 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
1135 if (n > 0) {
1136
1137 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1138 return log_oom();
1139
1140 for (j = 0; j < n; j++)
1141 if (in4_addr_is_non_local(&da[j]))
1142 addresses[n_addresses++] = da[j];
1143 }
1144 }
1145
1146 if (n_addresses <= 0)
1147 return 0;
1148
1149 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
1150 }
1151
1152 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1153 _cleanup_free_ struct in_addr *addresses = NULL;
1154 size_t n_addresses = 0, n_allocated = 0;
1155 char **a;
1156
1157 if (!link->network)
1158 return 0;
1159
1160 log_debug("Copying NTP server information from %s", link->ifname);
1161
1162 STRV_FOREACH(a, link->network->ntp) {
1163 struct in_addr ia;
1164
1165 /* Only look for IPv4 addresses */
1166 if (inet_pton(AF_INET, *a, &ia) <= 0)
1167 continue;
1168
1169 /* Never propagate obviously borked data */
1170 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1171 continue;
1172
1173 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1174 return log_oom();
1175
1176 addresses[n_addresses++] = ia;
1177 }
1178
1179 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1180 const struct in_addr *da = NULL;
1181 int j, n;
1182
1183 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1184 if (n > 0) {
1185
1186 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1187 return log_oom();
1188
1189 for (j = 0; j < n; j++)
1190 if (in4_addr_is_non_local(&da[j]))
1191 addresses[n_addresses++] = da[j];
1192 }
1193 }
1194
1195 if (n_addresses <= 0)
1196 return 0;
1197
1198 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1199 }
1200
1201 static int link_set_bridge_fdb(Link *link) {
1202 FdbEntry *fdb_entry;
1203 int r;
1204
1205 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1206 r = fdb_entry_configure(link, fdb_entry);
1207 if (r < 0)
1208 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1209 }
1210
1211 return 0;
1212 }
1213
1214 static int link_request_set_addresses(Link *link) {
1215 AddressLabel *label;
1216 Address *ad;
1217 int r;
1218
1219 assert(link);
1220 assert(link->network);
1221 assert(link->state != _LINK_STATE_INVALID);
1222
1223 link_set_state(link, LINK_STATE_CONFIGURING);
1224
1225 /* Reset all *_configured flags we are configuring. */
1226 link->addresses_configured = false;
1227 link->addresses_ready = false;
1228 link->neighbors_configured = false;
1229 link->static_routes_configured = false;
1230 link->routing_policy_rules_configured = false;
1231
1232 r = link_set_bridge_fdb(link);
1233 if (r < 0)
1234 return r;
1235
1236 r = link_request_set_neighbors(link);
1237 if (r < 0)
1238 return r;
1239
1240 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1241 bool update;
1242
1243 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1244
1245 r = address_configure(ad, link, address_handler, update);
1246 if (r < 0) {
1247 log_link_warning_errno(link, r, "Could not set addresses: %m");
1248 link_enter_failed(link);
1249 return r;
1250 }
1251
1252 link->address_messages++;
1253 }
1254
1255 LIST_FOREACH(labels, label, link->network->address_labels) {
1256 r = address_label_configure(label, link, NULL, false);
1257 if (r < 0) {
1258 log_link_warning_errno(link, r, "Could not set address label: %m");
1259 link_enter_failed(link);
1260 return r;
1261 }
1262
1263 link->address_label_messages++;
1264 }
1265
1266 /* now that we can figure out a default address for the dhcp server,
1267 start it */
1268 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1269 Address *address;
1270 Link *uplink = NULL;
1271 bool acquired_uplink = false;
1272
1273 address = link_find_dhcp_server_address(link);
1274 if (!address) {
1275 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1276 link_enter_failed(link);
1277 return 0;
1278 }
1279
1280 /* use the server address' subnet as the pool */
1281 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1282 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1283 if (r < 0)
1284 return r;
1285
1286 /* TODO:
1287 r = sd_dhcp_server_set_router(link->dhcp_server,
1288 &main_address->in_addr.in);
1289 if (r < 0)
1290 return r;
1291 */
1292
1293 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1294 r = sd_dhcp_server_set_max_lease_time(
1295 link->dhcp_server,
1296 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1297 if (r < 0)
1298 return r;
1299 }
1300
1301 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1302 r = sd_dhcp_server_set_default_lease_time(
1303 link->dhcp_server,
1304 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1305 if (r < 0)
1306 return r;
1307 }
1308
1309 if (link->network->dhcp_server_emit_dns) {
1310
1311 if (link->network->n_dhcp_server_dns > 0)
1312 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1313 else {
1314 uplink = manager_find_uplink(link->manager, link);
1315 acquired_uplink = true;
1316
1317 if (!uplink) {
1318 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1319 r = 0;
1320 } else
1321 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1322 }
1323 if (r < 0)
1324 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1325 }
1326
1327 if (link->network->dhcp_server_emit_ntp) {
1328
1329 if (link->network->n_dhcp_server_ntp > 0)
1330 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1331 else {
1332 if (!acquired_uplink)
1333 uplink = manager_find_uplink(link->manager, link);
1334
1335 if (!uplink) {
1336 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1337 r = 0;
1338 } else
1339 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1340
1341 }
1342 if (r < 0)
1343 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1344 }
1345
1346 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1347 if (r < 0)
1348 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1349
1350 if (link->network->dhcp_server_emit_timezone) {
1351 _cleanup_free_ char *buffer = NULL;
1352 const char *tz = NULL;
1353
1354 if (link->network->dhcp_server_timezone)
1355 tz = link->network->dhcp_server_timezone;
1356 else {
1357 r = get_timezone(&buffer);
1358 if (r < 0)
1359 log_warning_errno(r, "Failed to determine timezone: %m");
1360 else
1361 tz = buffer;
1362 }
1363
1364 if (tz) {
1365 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1366 if (r < 0)
1367 return r;
1368 }
1369 }
1370 if (!sd_dhcp_server_is_running(link->dhcp_server)) {
1371 r = sd_dhcp_server_start(link->dhcp_server);
1372 if (r < 0) {
1373 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1374
1375 link_enter_failed(link);
1376
1377 return 0;
1378 }
1379 }
1380
1381 log_link_debug(link, "Offering DHCPv4 leases");
1382 }
1383
1384 if (link->address_messages == 0) {
1385 link->addresses_configured = true;
1386 link_check_ready(link);
1387 } else
1388 log_link_debug(link, "Setting addresses");
1389
1390 return 0;
1391 }
1392
1393 static int link_set_bridge_vlan(Link *link) {
1394 int r = 0;
1395
1396 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1397 if (r < 0)
1398 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1399
1400 return r;
1401 }
1402
1403 static int link_set_proxy_arp(Link *link) {
1404 int r;
1405
1406 if (!link_proxy_arp_enabled(link))
1407 return 0;
1408
1409 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1410 if (r < 0)
1411 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1412
1413 return 0;
1414 }
1415
1416 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1417 int r;
1418
1419 assert(link);
1420
1421 log_link_debug(link, "Set link");
1422
1423 r = sd_netlink_message_get_errno(m);
1424 if (r < 0 && r != -EEXIST) {
1425 log_link_error_errno(link, r, "Could not join netdev: %m");
1426 link_enter_failed(link);
1427 }
1428
1429 return 1;
1430 }
1431
1432 static int link_configure_after_setting_mtu(Link *link);
1433
1434 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1435 int r;
1436
1437 assert(m);
1438 assert(link);
1439 assert(link->ifname);
1440
1441 link->setting_mtu = false;
1442
1443 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1444 return 1;
1445
1446 r = sd_netlink_message_get_errno(m);
1447 if (r < 0) {
1448 log_link_warning_errno(link, r, "Could not set MTU: %m");
1449 return 1;
1450 }
1451
1452 log_link_debug(link, "Setting MTU done.");
1453
1454 if (link->state == LINK_STATE_PENDING)
1455 (void) link_configure_after_setting_mtu(link);
1456
1457 return 1;
1458 }
1459
1460 int link_set_mtu(Link *link, uint32_t mtu, bool force) {
1461 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1462 int r;
1463
1464 assert(link);
1465 assert(link->manager);
1466 assert(link->manager->rtnl);
1467
1468 if (mtu == 0 || link->setting_mtu)
1469 return 0;
1470
1471 if (force ? link->mtu == mtu : link->mtu >= mtu)
1472 return 0;
1473
1474 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1475
1476 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1477 if (r < 0)
1478 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1479
1480 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1481 * for this interface, then disable IPv6 else enable it. */
1482 (void) link_enable_ipv6(link);
1483
1484 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1485 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1486 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1487
1488 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1489 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1490
1491 mtu = IPV6_MIN_MTU;
1492 }
1493
1494 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1495 if (r < 0)
1496 return log_link_error_errno(link, r, "Could not append MTU: %m");
1497
1498 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1499 link_netlink_destroy_callback, link);
1500 if (r < 0)
1501 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1502
1503 link_ref(link);
1504 link->setting_mtu = true;
1505
1506 return 0;
1507 }
1508
1509 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1510 int r;
1511
1512 assert(m);
1513 assert(link);
1514 assert(link->ifname);
1515
1516 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1517 return 1;
1518
1519 r = sd_netlink_message_get_errno(m);
1520 if (r < 0)
1521 log_link_warning_errno(link, r, "Could not set link flags: %m");
1522
1523 return 1;
1524 }
1525
1526 static int link_set_flags(Link *link) {
1527 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1528 unsigned ifi_change = 0;
1529 unsigned ifi_flags = 0;
1530 int r;
1531
1532 assert(link);
1533 assert(link->manager);
1534 assert(link->manager->rtnl);
1535
1536 if (link->flags & IFF_LOOPBACK)
1537 return 0;
1538
1539 if (!link->network)
1540 return 0;
1541
1542 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1543 return 0;
1544
1545 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1546 if (r < 0)
1547 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1548
1549 if (link->network->arp >= 0) {
1550 ifi_change |= IFF_NOARP;
1551 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1552 }
1553
1554 if (link->network->multicast >= 0) {
1555 ifi_change |= IFF_MULTICAST;
1556 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1557 }
1558
1559 if (link->network->allmulticast >= 0) {
1560 ifi_change |= IFF_ALLMULTI;
1561 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1562 }
1563
1564 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1565 if (r < 0)
1566 return log_link_error_errno(link, r, "Could not set link flags: %m");
1567
1568 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1569 link_netlink_destroy_callback, link);
1570 if (r < 0)
1571 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1572
1573 link_ref(link);
1574
1575 return 0;
1576 }
1577
1578 static int link_set_bridge(Link *link) {
1579 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1580 int r;
1581
1582 assert(link);
1583 assert(link->network);
1584
1585 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1586 if (r < 0)
1587 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1588
1589 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1590 if (r < 0)
1591 return log_link_error_errno(link, r, "Could not set message family: %m");
1592
1593 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1594 if (r < 0)
1595 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1596
1597 if (link->network->use_bpdu >= 0) {
1598 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
1599 if (r < 0)
1600 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1601 }
1602
1603 if (link->network->hairpin >= 0) {
1604 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1605 if (r < 0)
1606 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1607 }
1608
1609 if (link->network->fast_leave >= 0) {
1610 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1611 if (r < 0)
1612 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1613 }
1614
1615 if (link->network->allow_port_to_be_root >= 0) {
1616 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
1617 if (r < 0)
1618 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1619
1620 }
1621
1622 if (link->network->unicast_flood >= 0) {
1623 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1624 if (r < 0)
1625 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1626 }
1627
1628 if (link->network->multicast_flood >= 0) {
1629 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_FLOOD, link->network->multicast_flood);
1630 if (r < 0)
1631 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_FLOOD attribute: %m");
1632 }
1633
1634 if (link->network->multicast_to_unicast >= 0) {
1635 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_TO_UCAST, link->network->multicast_to_unicast);
1636 if (r < 0)
1637 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_TO_UCAST attribute: %m");
1638 }
1639
1640 if (link->network->neighbor_suppression >= 0) {
1641 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_NEIGH_SUPPRESS, link->network->neighbor_suppression);
1642 if (r < 0)
1643 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_NEIGH_SUPPRESS attribute: %m");
1644 }
1645
1646 if (link->network->learning >= 0) {
1647 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_LEARNING, link->network->learning);
1648 if (r < 0)
1649 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_LEARNING attribute: %m");
1650 }
1651
1652 if (link->network->cost != 0) {
1653 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1654 if (r < 0)
1655 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1656 }
1657
1658 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1659 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1660 if (r < 0)
1661 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1662 }
1663
1664 r = sd_netlink_message_close_container(req);
1665 if (r < 0)
1666 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1667
1668 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_handler,
1669 link_netlink_destroy_callback, link);
1670 if (r < 0)
1671 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1672
1673 link_ref(link);
1674
1675 return r;
1676 }
1677
1678 static int link_set_bond_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1679 int r;
1680
1681 assert(m);
1682 assert(link);
1683 assert(link->ifname);
1684
1685 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1686 return 1;
1687
1688 r = sd_netlink_message_get_errno(m);
1689 if (r < 0) {
1690 log_link_warning_errno(link, r, "Could not set bonding interface: %m");
1691 return 1;
1692 }
1693
1694 return 1;
1695 }
1696
1697 static int link_set_bond(Link *link) {
1698 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1699 int r;
1700
1701 assert(link);
1702 assert(link->network);
1703
1704 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1705 if (r < 0)
1706 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1707
1708 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1709 if (r < 0)
1710 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1711
1712 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1713 if (r < 0)
1714 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1715
1716 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1717 if (r < 0)
1718 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1719
1720 if (link->network->active_slave) {
1721 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1722 if (r < 0)
1723 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1724 }
1725
1726 if (link->network->primary_slave) {
1727 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1728 if (r < 0)
1729 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1730 }
1731
1732 r = sd_netlink_message_close_container(req);
1733 if (r < 0)
1734 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1735
1736 r = sd_netlink_message_close_container(req);
1737 if (r < 0)
1738 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1739
1740 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_bond_handler,
1741 link_netlink_destroy_callback, link);
1742 if (r < 0)
1743 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1744
1745 link_ref(link);
1746
1747 return r;
1748 }
1749
1750 static int link_append_to_master(Link *link, NetDev *netdev) {
1751 Link *master;
1752 int r;
1753
1754 assert(link);
1755 assert(netdev);
1756
1757 r = link_get(link->manager, netdev->ifindex, &master);
1758 if (r < 0)
1759 return r;
1760
1761 r = hashmap_ensure_allocated(&master->slaves, NULL);
1762 if (r < 0)
1763 return r;
1764
1765 r = hashmap_put(master->slaves, INT_TO_PTR(link->ifindex), link);
1766 if (r < 0)
1767 return r;
1768
1769 return 0;
1770 }
1771
1772 static int link_lldp_save(Link *link) {
1773 _cleanup_free_ char *temp_path = NULL;
1774 _cleanup_fclose_ FILE *f = NULL;
1775 sd_lldp_neighbor **l = NULL;
1776 int n = 0, r, i;
1777
1778 assert(link);
1779 assert(link->lldp_file);
1780
1781 if (!link->lldp) {
1782 (void) unlink(link->lldp_file);
1783 return 0;
1784 }
1785
1786 r = sd_lldp_get_neighbors(link->lldp, &l);
1787 if (r < 0)
1788 goto finish;
1789 if (r == 0) {
1790 (void) unlink(link->lldp_file);
1791 goto finish;
1792 }
1793
1794 n = r;
1795
1796 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1797 if (r < 0)
1798 goto finish;
1799
1800 fchmod(fileno(f), 0644);
1801
1802 for (i = 0; i < n; i++) {
1803 const void *p;
1804 le64_t u;
1805 size_t sz;
1806
1807 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1808 if (r < 0)
1809 goto finish;
1810
1811 u = htole64(sz);
1812 (void) fwrite(&u, 1, sizeof(u), f);
1813 (void) fwrite(p, 1, sz, f);
1814 }
1815
1816 r = fflush_and_check(f);
1817 if (r < 0)
1818 goto finish;
1819
1820 if (rename(temp_path, link->lldp_file) < 0) {
1821 r = -errno;
1822 goto finish;
1823 }
1824
1825 finish:
1826 if (r < 0) {
1827 (void) unlink(link->lldp_file);
1828 if (temp_path)
1829 (void) unlink(temp_path);
1830
1831 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1832 }
1833
1834 if (l) {
1835 for (i = 0; i < n; i++)
1836 sd_lldp_neighbor_unref(l[i]);
1837 free(l);
1838 }
1839
1840 return r;
1841 }
1842
1843 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1844 Link *link = userdata;
1845 int r;
1846
1847 assert(link);
1848
1849 (void) link_lldp_save(link);
1850
1851 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1852 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1853
1854 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1855
1856 r = link_lldp_emit_start(link);
1857 if (r < 0)
1858 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1859 }
1860 }
1861
1862 static int link_acquire_ipv6_conf(Link *link) {
1863 int r;
1864
1865 assert(link);
1866
1867 if (link_ipv6_accept_ra_enabled(link)) {
1868 assert(link->ndisc);
1869
1870 log_link_debug(link, "Discovering IPv6 routers");
1871
1872 r = sd_ndisc_start(link->ndisc);
1873 if (r < 0 && r != -EBUSY)
1874 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1875 }
1876
1877 if (link_radv_enabled(link)) {
1878 assert(link->radv);
1879 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1880
1881 log_link_debug(link, "Starting IPv6 Router Advertisements");
1882
1883 r = sd_radv_start(link->radv);
1884 if (r < 0 && r != -EBUSY)
1885 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1886 }
1887
1888 (void) dhcp6_request_prefix_delegation(link);
1889
1890 return 0;
1891 }
1892
1893 static int link_acquire_ipv4_conf(Link *link) {
1894 int r;
1895
1896 assert(link);
1897 assert(link->network);
1898 assert(link->manager);
1899 assert(link->manager->event);
1900
1901 if (link_ipv4ll_enabled(link)) {
1902 assert(link->ipv4ll);
1903
1904 log_link_debug(link, "Acquiring IPv4 link-local address");
1905
1906 r = sd_ipv4ll_start(link->ipv4ll);
1907 if (r < 0)
1908 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1909 }
1910
1911 if (link_dhcp4_enabled(link)) {
1912 assert(link->dhcp_client);
1913
1914 log_link_debug(link, "Acquiring DHCPv4 lease");
1915
1916 r = sd_dhcp_client_start(link->dhcp_client);
1917 if (r < 0)
1918 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1919 }
1920
1921 return 0;
1922 }
1923
1924 static int link_acquire_conf(Link *link) {
1925 int r;
1926
1927 assert(link);
1928
1929 r = link_acquire_ipv4_conf(link);
1930 if (r < 0)
1931 return r;
1932
1933 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1934 r = link_acquire_ipv6_conf(link);
1935 if (r < 0)
1936 return r;
1937 }
1938
1939 if (link_lldp_emit_enabled(link)) {
1940 r = link_lldp_emit_start(link);
1941 if (r < 0)
1942 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1943 }
1944
1945 return 0;
1946 }
1947
1948 bool link_has_carrier(Link *link) {
1949 /* see Documentation/networking/operstates.txt in the kernel sources */
1950
1951 if (link->kernel_operstate == IF_OPER_UP)
1952 return true;
1953
1954 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1955 /* operstate may not be implemented, so fall back to flags */
1956 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1957 return true;
1958
1959 return false;
1960 }
1961
1962 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1963 int r;
1964
1965 assert(link);
1966
1967 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1968 return 1;
1969
1970 r = sd_netlink_message_get_errno(m);
1971 if (r < 0)
1972 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1973
1974 return 1;
1975 }
1976
1977 static int link_configure_addrgen_mode(Link *link) {
1978 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1979 uint8_t ipv6ll_mode;
1980 int r;
1981
1982 assert(link);
1983 assert(link->network);
1984 assert(link->manager);
1985 assert(link->manager->rtnl);
1986
1987 log_link_debug(link, "Setting address genmode for link");
1988
1989 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1990 if (r < 0)
1991 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1992
1993 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1994 if (r < 0)
1995 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1996
1997 r = sd_netlink_message_open_container(req, AF_INET6);
1998 if (r < 0)
1999 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
2000
2001 if (!link_ipv6ll_enabled(link))
2002 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
2003 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
2004 /* The file may not exist. And event if it exists, when stable_secret is unset,
2005 * reading the file fails with EIO. */
2006 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
2007 else
2008 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
2009
2010 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
2011 if (r < 0)
2012 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
2013
2014 r = sd_netlink_message_close_container(req);
2015 if (r < 0)
2016 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
2017
2018 r = sd_netlink_message_close_container(req);
2019 if (r < 0)
2020 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
2021
2022 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
2023 link_netlink_destroy_callback, link);
2024 if (r < 0)
2025 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2026
2027 link_ref(link);
2028
2029 return 0;
2030 }
2031
2032 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2033 int r;
2034
2035 assert(link);
2036
2037 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2038 return 1;
2039
2040 r = sd_netlink_message_get_errno(m);
2041 if (r < 0)
2042 /* we warn but don't fail the link, as it may be brought up later */
2043 log_link_warning_errno(link, r, "Could not bring up interface: %m");
2044
2045 return 1;
2046 }
2047
2048 static int link_up(Link *link) {
2049 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2050 int r;
2051
2052 assert(link);
2053 assert(link->network);
2054 assert(link->manager);
2055 assert(link->manager->rtnl);
2056
2057 log_link_debug(link, "Bringing link up");
2058
2059 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2060 if (r < 0)
2061 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2062
2063 /* set it free if not enslaved with networkd */
2064 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
2065 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
2066 if (r < 0)
2067 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
2068 }
2069
2070 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
2071 if (r < 0)
2072 return log_link_error_errno(link, r, "Could not set link flags: %m");
2073
2074 if (link->network->mac) {
2075 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
2076 if (r < 0)
2077 return log_link_error_errno(link, r, "Could not set MAC address: %m");
2078 }
2079
2080 if (link_ipv6_enabled(link)) {
2081 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
2082 if (r < 0)
2083 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
2084
2085 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
2086 r = sd_netlink_message_open_container(req, AF_INET6);
2087 if (r < 0)
2088 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
2089
2090 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
2091 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
2092 if (r < 0)
2093 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
2094 }
2095
2096 r = sd_netlink_message_close_container(req);
2097 if (r < 0)
2098 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
2099
2100 r = sd_netlink_message_close_container(req);
2101 if (r < 0)
2102 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
2103 }
2104
2105 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2106 link_netlink_destroy_callback, link);
2107 if (r < 0)
2108 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2109
2110 link_ref(link);
2111
2112 return 0;
2113 }
2114
2115 static int link_up_can(Link *link) {
2116 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2117 int r;
2118
2119 assert(link);
2120
2121 log_link_debug(link, "Bringing CAN link up");
2122
2123 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2124 if (r < 0)
2125 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2126
2127 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
2128 if (r < 0)
2129 return log_link_error_errno(link, r, "Could not set link flags: %m");
2130
2131 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2132 link_netlink_destroy_callback, link);
2133 if (r < 0)
2134 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2135
2136 link_ref(link);
2137
2138 return 0;
2139 }
2140
2141 static int link_set_can(Link *link) {
2142 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
2143 int r;
2144
2145 assert(link);
2146 assert(link->network);
2147 assert(link->manager);
2148 assert(link->manager->rtnl);
2149
2150 log_link_debug(link, "link_set_can");
2151
2152 r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
2153 if (r < 0)
2154 return log_link_error_errno(link, r, "Failed to allocate netlink message: %m");
2155
2156 r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
2157 if (r < 0)
2158 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
2159
2160 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
2161 if (r < 0)
2162 return log_link_error_errno(link, r, "Failed to open netlink container: %m");
2163
2164 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
2165 if (r < 0)
2166 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
2167
2168 if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) {
2169 struct can_bittiming bt = {
2170 .bitrate = link->network->can_bitrate,
2171 .sample_point = link->network->can_sample_point,
2172 };
2173
2174 if (link->network->can_bitrate > UINT32_MAX) {
2175 log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate);
2176 return -ERANGE;
2177 }
2178
2179 log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate);
2180 if (link->network->can_sample_point > 0)
2181 log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
2182 else
2183 log_link_debug(link, "Using default sample point");
2184
2185 r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
2186 if (r < 0)
2187 return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
2188 }
2189
2190 if (link->network->can_restart_us > 0) {
2191 char time_string[FORMAT_TIMESPAN_MAX];
2192 uint64_t restart_ms;
2193
2194 if (link->network->can_restart_us == USEC_INFINITY)
2195 restart_ms = 0;
2196 else
2197 restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC);
2198
2199 format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC);
2200
2201 if (restart_ms > UINT32_MAX) {
2202 log_link_error(link, "restart timeout (%s) too big.", time_string);
2203 return -ERANGE;
2204 }
2205
2206 log_link_debug(link, "Setting restart = %s", time_string);
2207
2208 r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
2209 if (r < 0)
2210 return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
2211 }
2212
2213 if (link->network->can_triple_sampling >= 0) {
2214 struct can_ctrlmode cm = {
2215 .mask = CAN_CTRLMODE_3_SAMPLES,
2216 .flags = link->network->can_triple_sampling ? CAN_CTRLMODE_3_SAMPLES : 0,
2217 };
2218
2219 log_link_debug(link, "%sabling triple-sampling", link->network->can_triple_sampling ? "En" : "Dis");
2220
2221 r = sd_netlink_message_append_data(m, IFLA_CAN_CTRLMODE, &cm, sizeof(cm));
2222 if (r < 0)
2223 return log_link_error_errno(link, r, "Could not append IFLA_CAN_CTRLMODE attribute: %m");
2224 }
2225
2226 r = sd_netlink_message_close_container(m);
2227 if (r < 0)
2228 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2229
2230 r = sd_netlink_message_close_container(m);
2231 if (r < 0)
2232 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2233
2234 r = netlink_call_async(link->manager->rtnl, NULL, m, link_set_handler,
2235 link_netlink_destroy_callback, link);
2236 if (r < 0)
2237 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2238
2239 link_ref(link);
2240
2241 if (!(link->flags & IFF_UP)) {
2242 r = link_up_can(link);
2243 if (r < 0) {
2244 link_enter_failed(link);
2245 return r;
2246 }
2247 }
2248
2249 log_link_debug(link, "link_set_can done");
2250
2251 return r;
2252 }
2253
2254 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2255 int r;
2256
2257 assert(link);
2258
2259 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2260 return 1;
2261
2262 r = sd_netlink_message_get_errno(m);
2263 if (r < 0)
2264 log_link_warning_errno(link, r, "Could not bring down interface: %m");
2265
2266 if (streq_ptr(link->kind, "can"))
2267 link_set_can(link);
2268
2269 return 1;
2270 }
2271
2272 int link_down(Link *link) {
2273 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2274 int r;
2275
2276 assert(link);
2277 assert(link->manager);
2278 assert(link->manager->rtnl);
2279
2280 log_link_debug(link, "Bringing link down");
2281
2282 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
2283 RTM_SETLINK, link->ifindex);
2284 if (r < 0)
2285 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2286
2287 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
2288 if (r < 0)
2289 return log_link_error_errno(link, r, "Could not set link flags: %m");
2290
2291 r = netlink_call_async(link->manager->rtnl, NULL, req, link_down_handler,
2292 link_netlink_destroy_callback, link);
2293 if (r < 0)
2294 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2295
2296 link_ref(link);
2297
2298 return 0;
2299 }
2300
2301 static int link_handle_bound_to_list(Link *link) {
2302 Link *l;
2303 Iterator i;
2304 int r;
2305 bool required_up = false;
2306 bool link_is_up = false;
2307
2308 assert(link);
2309
2310 if (hashmap_isempty(link->bound_to_links))
2311 return 0;
2312
2313 if (link->flags & IFF_UP)
2314 link_is_up = true;
2315
2316 HASHMAP_FOREACH (l, link->bound_to_links, i)
2317 if (link_has_carrier(l)) {
2318 required_up = true;
2319 break;
2320 }
2321
2322 if (!required_up && link_is_up) {
2323 r = link_down(link);
2324 if (r < 0)
2325 return r;
2326 } else if (required_up && !link_is_up) {
2327 r = link_up(link);
2328 if (r < 0)
2329 return r;
2330 }
2331
2332 return 0;
2333 }
2334
2335 static int link_handle_bound_by_list(Link *link) {
2336 Iterator i;
2337 Link *l;
2338 int r;
2339
2340 assert(link);
2341
2342 if (hashmap_isempty(link->bound_by_links))
2343 return 0;
2344
2345 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2346 r = link_handle_bound_to_list(l);
2347 if (r < 0)
2348 return r;
2349 }
2350
2351 return 0;
2352 }
2353
2354 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2355 int r;
2356
2357 assert(link);
2358 assert(carrier);
2359
2360 if (link == carrier)
2361 return 0;
2362
2363 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2364 return 0;
2365
2366 r = hashmap_ensure_allocated(h, NULL);
2367 if (r < 0)
2368 return r;
2369
2370 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2371 if (r < 0)
2372 return r;
2373
2374 return 0;
2375 }
2376
2377 static int link_new_bound_by_list(Link *link) {
2378 Manager *m;
2379 Link *carrier;
2380 Iterator i;
2381 int r;
2382 bool list_updated = false;
2383
2384 assert(link);
2385 assert(link->manager);
2386
2387 m = link->manager;
2388
2389 HASHMAP_FOREACH(carrier, m->links, i) {
2390 if (!carrier->network)
2391 continue;
2392
2393 if (strv_isempty(carrier->network->bind_carrier))
2394 continue;
2395
2396 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2397 r = link_put_carrier(link, carrier, &link->bound_by_links);
2398 if (r < 0)
2399 return r;
2400
2401 list_updated = true;
2402 }
2403 }
2404
2405 if (list_updated)
2406 link_dirty(link);
2407
2408 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2409 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2410 if (r < 0)
2411 return r;
2412
2413 link_dirty(carrier);
2414 }
2415
2416 return 0;
2417 }
2418
2419 static int link_new_bound_to_list(Link *link) {
2420 Manager *m;
2421 Link *carrier;
2422 Iterator i;
2423 int r;
2424 bool list_updated = false;
2425
2426 assert(link);
2427 assert(link->manager);
2428
2429 if (!link->network)
2430 return 0;
2431
2432 if (strv_isempty(link->network->bind_carrier))
2433 return 0;
2434
2435 m = link->manager;
2436
2437 HASHMAP_FOREACH (carrier, m->links, i) {
2438 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2439 r = link_put_carrier(link, carrier, &link->bound_to_links);
2440 if (r < 0)
2441 return r;
2442
2443 list_updated = true;
2444 }
2445 }
2446
2447 if (list_updated)
2448 link_dirty(link);
2449
2450 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2451 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2452 if (r < 0)
2453 return r;
2454
2455 link_dirty(carrier);
2456 }
2457
2458 return 0;
2459 }
2460
2461 static int link_new_carrier_maps(Link *link) {
2462 int r;
2463
2464 r = link_new_bound_by_list(link);
2465 if (r < 0)
2466 return r;
2467
2468 r = link_handle_bound_by_list(link);
2469 if (r < 0)
2470 return r;
2471
2472 r = link_new_bound_to_list(link);
2473 if (r < 0)
2474 return r;
2475
2476 r = link_handle_bound_to_list(link);
2477 if (r < 0)
2478 return r;
2479
2480 return 0;
2481 }
2482
2483 static void link_free_bound_to_list(Link *link) {
2484 Link *bound_to;
2485 Iterator i;
2486
2487 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2488 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2489
2490 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2491 link_dirty(bound_to);
2492 }
2493
2494 return;
2495 }
2496
2497 static void link_free_bound_by_list(Link *link) {
2498 Link *bound_by;
2499 Iterator i;
2500
2501 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2502 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2503
2504 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2505 link_dirty(bound_by);
2506 link_handle_bound_to_list(bound_by);
2507 }
2508 }
2509
2510 return;
2511 }
2512
2513 static void link_free_carrier_maps(Link *link) {
2514 bool list_updated = false;
2515
2516 assert(link);
2517
2518 if (!hashmap_isempty(link->bound_to_links)) {
2519 link_free_bound_to_list(link);
2520 list_updated = true;
2521 }
2522
2523 if (!hashmap_isempty(link->bound_by_links)) {
2524 link_free_bound_by_list(link);
2525 list_updated = true;
2526 }
2527
2528 if (list_updated)
2529 link_dirty(link);
2530
2531 return;
2532 }
2533
2534 void link_drop(Link *link) {
2535 if (!link || link->state == LINK_STATE_LINGER)
2536 return;
2537
2538 link_set_state(link, LINK_STATE_LINGER);
2539
2540 link_free_carrier_maps(link);
2541
2542 log_link_debug(link, "Link removed");
2543
2544 (void) unlink(link->state_file);
2545
2546 link_detach_from_manager(link);
2547
2548 link_unref(link);
2549
2550 return;
2551 }
2552
2553 static int link_joined(Link *link) {
2554 int r;
2555
2556 assert(link);
2557 assert(link->network);
2558
2559 if (!hashmap_isempty(link->bound_to_links)) {
2560 r = link_handle_bound_to_list(link);
2561 if (r < 0)
2562 return r;
2563 } else if (!(link->flags & IFF_UP)) {
2564 r = link_up(link);
2565 if (r < 0) {
2566 link_enter_failed(link);
2567 return r;
2568 }
2569 }
2570
2571 if (link->network->bridge) {
2572 r = link_set_bridge(link);
2573 if (r < 0)
2574 log_link_error_errno(link, r, "Could not set bridge message: %m");
2575
2576 r = link_append_to_master(link, link->network->bridge);
2577 if (r < 0)
2578 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2579 }
2580
2581 if (link->network->bond) {
2582 r = link_set_bond(link);
2583 if (r < 0)
2584 log_link_error_errno(link, r, "Could not set bond message: %m");
2585
2586 r = link_append_to_master(link, link->network->bond);
2587 if (r < 0)
2588 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2589 }
2590
2591 if (link->network->use_br_vlan &&
2592 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2593 r = link_set_bridge_vlan(link);
2594 if (r < 0)
2595 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2596 }
2597
2598 /* Skip setting up addresses until it gets carrier,
2599 or it would try to set addresses twice,
2600 which is bad for non-idempotent steps. */
2601 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2602 return 0;
2603
2604 return link_request_set_addresses(link);
2605 }
2606
2607 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2608 int r;
2609
2610 assert(link);
2611 assert(link->network);
2612 assert(link->enslaving > 0);
2613 assert(!link->enslaved_raw);
2614
2615 link->enslaving--;
2616
2617 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2618 return 1;
2619
2620 r = sd_netlink_message_get_errno(m);
2621 if (r < 0 && r != -EEXIST) {
2622 log_link_error_errno(link, r, "Could not join netdev: %m");
2623 link_enter_failed(link);
2624 return 1;
2625 } else
2626 log_link_debug(link, "Joined netdev");
2627
2628 if (link->enslaving == 0) {
2629 link->enslaved_raw = true;
2630 link_joined(link);
2631 }
2632
2633 return 1;
2634 }
2635
2636 static int link_enter_join_netdev(Link *link) {
2637 NetDev *netdev;
2638 Iterator i;
2639 int r;
2640
2641 assert(link);
2642 assert(link->network);
2643 assert(link->state == LINK_STATE_PENDING);
2644
2645 link_set_state(link, LINK_STATE_CONFIGURING);
2646
2647 link_dirty(link);
2648 link->enslaving = 0;
2649 link->enslaved_raw = false;
2650
2651 if (link->network->bond) {
2652 if (link->network->bond->state == NETDEV_STATE_READY &&
2653 link->network->bond->ifindex == link->master_ifindex)
2654 return link_joined(link);
2655
2656 log_struct(LOG_DEBUG,
2657 LOG_LINK_INTERFACE(link),
2658 LOG_NETDEV_INTERFACE(link->network->bond),
2659 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2660
2661 link->enslaving++;
2662
2663 r = netdev_join(link->network->bond, link, netdev_join_handler);
2664 if (r < 0) {
2665 log_struct_errno(LOG_WARNING, r,
2666 LOG_LINK_INTERFACE(link),
2667 LOG_NETDEV_INTERFACE(link->network->bond),
2668 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2669 link_enter_failed(link);
2670 return r;
2671 }
2672 }
2673
2674 if (link->network->bridge) {
2675 log_struct(LOG_DEBUG,
2676 LOG_LINK_INTERFACE(link),
2677 LOG_NETDEV_INTERFACE(link->network->bridge),
2678 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2679
2680 link->enslaving++;
2681
2682 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2683 if (r < 0) {
2684 log_struct_errno(LOG_WARNING, r,
2685 LOG_LINK_INTERFACE(link),
2686 LOG_NETDEV_INTERFACE(link->network->bridge),
2687 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2688 link_enter_failed(link);
2689 return r;
2690 }
2691 }
2692
2693 if (link->network->vrf) {
2694 log_struct(LOG_DEBUG,
2695 LOG_LINK_INTERFACE(link),
2696 LOG_NETDEV_INTERFACE(link->network->vrf),
2697 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2698
2699 link->enslaving++;
2700
2701 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2702 if (r < 0) {
2703 log_struct_errno(LOG_WARNING, r,
2704 LOG_LINK_INTERFACE(link),
2705 LOG_NETDEV_INTERFACE(link->network->vrf),
2706 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2707 link_enter_failed(link);
2708 return r;
2709 }
2710 }
2711
2712 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2713
2714 if (netdev->ifindex > 0)
2715 /* Assume already enslaved. */
2716 continue;
2717
2718 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2719 continue;
2720
2721 log_struct(LOG_DEBUG,
2722 LOG_LINK_INTERFACE(link),
2723 LOG_NETDEV_INTERFACE(netdev),
2724 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2725
2726 link->enslaving++;
2727
2728 r = netdev_join(netdev, link, netdev_join_handler);
2729 if (r < 0) {
2730 log_struct_errno(LOG_WARNING, r,
2731 LOG_LINK_INTERFACE(link),
2732 LOG_NETDEV_INTERFACE(netdev),
2733 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2734 link_enter_failed(link);
2735 return r;
2736 }
2737 }
2738
2739 if (link->enslaving == 0)
2740 return link_joined(link);
2741
2742 return 0;
2743 }
2744
2745 static int link_set_ipv4_forward(Link *link) {
2746 int r;
2747
2748 if (!link_ipv4_forward_enabled(link))
2749 return 0;
2750
2751 /* We propagate the forwarding flag from one interface to the
2752 * global setting one way. This means: as long as at least one
2753 * interface was configured at any time that had IP forwarding
2754 * enabled the setting will stay on for good. We do this
2755 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2756 * somewhat in sync (see below). */
2757
2758 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2759 if (r < 0)
2760 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2761
2762 return 0;
2763 }
2764
2765 static int link_set_ipv6_forward(Link *link) {
2766 int r;
2767
2768 if (!link_ipv6_forward_enabled(link))
2769 return 0;
2770
2771 /* On Linux, the IPv6 stack does not know a per-interface
2772 * packet forwarding setting: either packet forwarding is on
2773 * for all, or off for all. We hence don't bother with a
2774 * per-interface setting, but simply propagate the interface
2775 * flag, if it is set, to the global flag, one-way. Note that
2776 * while IPv4 would allow a per-interface flag, we expose the
2777 * same behaviour there and also propagate the setting from
2778 * one to all, to keep things simple (see above). */
2779
2780 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2781 if (r < 0)
2782 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2783
2784 return 0;
2785 }
2786
2787 static int link_set_ipv6_privacy_extensions(Link *link) {
2788 IPv6PrivacyExtensions s;
2789 int r;
2790
2791 s = link_ipv6_privacy_extensions(link);
2792 if (s < 0)
2793 return 0;
2794
2795 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2796 if (r < 0)
2797 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2798
2799 return 0;
2800 }
2801
2802 static int link_set_ipv6_accept_ra(Link *link) {
2803 int r;
2804
2805 /* Make this a NOP if IPv6 is not available */
2806 if (!socket_ipv6_is_supported())
2807 return 0;
2808
2809 if (link->flags & IFF_LOOPBACK)
2810 return 0;
2811
2812 if (!link->network)
2813 return 0;
2814
2815 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2816 if (r < 0)
2817 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2818
2819 return 0;
2820 }
2821
2822 static int link_set_ipv6_dad_transmits(Link *link) {
2823 int r;
2824
2825 /* Make this a NOP if IPv6 is not available */
2826 if (!socket_ipv6_is_supported())
2827 return 0;
2828
2829 if (link->flags & IFF_LOOPBACK)
2830 return 0;
2831
2832 if (!link->network)
2833 return 0;
2834
2835 if (link->network->ipv6_dad_transmits < 0)
2836 return 0;
2837
2838 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2839 if (r < 0)
2840 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2841
2842 return 0;
2843 }
2844
2845 static int link_set_ipv6_hop_limit(Link *link) {
2846 int r;
2847
2848 /* Make this a NOP if IPv6 is not available */
2849 if (!socket_ipv6_is_supported())
2850 return 0;
2851
2852 if (link->flags & IFF_LOOPBACK)
2853 return 0;
2854
2855 if (!link->network)
2856 return 0;
2857
2858 if (link->network->ipv6_hop_limit < 0)
2859 return 0;
2860
2861 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2862 if (r < 0)
2863 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2864
2865 return 0;
2866 }
2867
2868 static int link_set_ipv6_mtu(Link *link) {
2869 int r;
2870
2871 /* Make this a NOP if IPv6 is not available */
2872 if (!socket_ipv6_is_supported())
2873 return 0;
2874
2875 if (link->flags & IFF_LOOPBACK)
2876 return 0;
2877
2878 if (link->network->ipv6_mtu == 0)
2879 return 0;
2880
2881 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2882 if (r < 0)
2883 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2884
2885 return 0;
2886 }
2887
2888 static bool link_is_static_address_configured(Link *link, Address *address) {
2889 Address *net_address;
2890
2891 assert(link);
2892 assert(address);
2893
2894 if (!link->network)
2895 return false;
2896
2897 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2898 if (address_equal(net_address, address))
2899 return true;
2900
2901 return false;
2902 }
2903
2904 static bool link_is_static_route_configured(Link *link, Route *route) {
2905 Route *net_route;
2906
2907 assert(link);
2908 assert(route);
2909
2910 if (!link->network)
2911 return false;
2912
2913 LIST_FOREACH(routes, net_route, link->network->static_routes)
2914 if (route_equal(net_route, route))
2915 return true;
2916
2917 return false;
2918 }
2919
2920 static int link_drop_foreign_config(Link *link) {
2921 Address *address;
2922 Route *route;
2923 Iterator i;
2924 int r;
2925
2926 SET_FOREACH(address, link->addresses_foreign, i) {
2927 /* we consider IPv6LL addresses to be managed by the kernel */
2928 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2929 continue;
2930
2931 if (link_is_static_address_configured(link, address)) {
2932 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2933 if (r < 0)
2934 return log_link_error_errno(link, r, "Failed to add address: %m");
2935 } else {
2936 r = address_remove(address, link, NULL);
2937 if (r < 0)
2938 return r;
2939 }
2940 }
2941
2942 SET_FOREACH(route, link->routes_foreign, i) {
2943 /* do not touch routes managed by the kernel */
2944 if (route->protocol == RTPROT_KERNEL)
2945 continue;
2946
2947 if (link_is_static_route_configured(link, route)) {
2948 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2949 if (r < 0)
2950 return r;
2951 } else {
2952 r = route_remove(route, link, NULL);
2953 if (r < 0)
2954 return r;
2955 }
2956 }
2957
2958 return 0;
2959 }
2960
2961 static int link_drop_config(Link *link) {
2962 Address *address, *pool_address;
2963 Route *route;
2964 Iterator i;
2965 int r;
2966
2967 SET_FOREACH(address, link->addresses, i) {
2968 /* we consider IPv6LL addresses to be managed by the kernel */
2969 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2970 continue;
2971
2972 r = address_remove(address, link, NULL);
2973 if (r < 0)
2974 return r;
2975
2976 /* If this address came from an address pool, clean up the pool */
2977 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2978 if (address_equal(address, pool_address)) {
2979 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2980 address_free(pool_address);
2981 break;
2982 }
2983 }
2984 }
2985
2986 SET_FOREACH(route, link->routes, i) {
2987 /* do not touch routes managed by the kernel */
2988 if (route->protocol == RTPROT_KERNEL)
2989 continue;
2990
2991 r = route_remove(route, link, NULL);
2992 if (r < 0)
2993 return r;
2994 }
2995
2996 ndisc_flush(link);
2997
2998 return 0;
2999 }
3000
3001 static int link_update_lldp(Link *link) {
3002 int r;
3003
3004 assert(link);
3005
3006 if (!link->lldp)
3007 return 0;
3008
3009 if (link->flags & IFF_UP) {
3010 r = sd_lldp_start(link->lldp);
3011 if (r > 0)
3012 log_link_debug(link, "Started LLDP.");
3013 } else {
3014 r = sd_lldp_stop(link->lldp);
3015 if (r > 0)
3016 log_link_debug(link, "Stopped LLDP.");
3017 }
3018
3019 return r;
3020 }
3021
3022 static int link_configure_can(Link *link) {
3023 int r;
3024
3025 if (streq_ptr(link->kind, "can")) {
3026 /* The CAN interface must be down to configure bitrate, etc... */
3027 if ((link->flags & IFF_UP)) {
3028 r = link_down(link);
3029 if (r < 0) {
3030 link_enter_failed(link);
3031 return r;
3032 }
3033
3034 return 0;
3035 }
3036
3037 return link_set_can(link);
3038 }
3039
3040 if (!(link->flags & IFF_UP)) {
3041 r = link_up_can(link);
3042 if (r < 0) {
3043 link_enter_failed(link);
3044 return r;
3045 }
3046 }
3047
3048 return 0;
3049 }
3050
3051 static int link_configure(Link *link) {
3052 int r;
3053
3054 assert(link);
3055 assert(link->network);
3056 assert(link->state == LINK_STATE_PENDING);
3057
3058 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
3059 return link_configure_can(link);
3060
3061 /* Drop foreign config, but ignore loopback or critical devices.
3062 * We do not want to remove loopback address or addresses used for root NFS. */
3063 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
3064 r = link_drop_foreign_config(link);
3065 if (r < 0)
3066 return r;
3067 }
3068
3069 r = link_set_proxy_arp(link);
3070 if (r < 0)
3071 return r;
3072
3073 r = ipv6_proxy_ndp_addresses_configure(link);
3074 if (r < 0)
3075 return r;
3076
3077 r = link_set_ipv4_forward(link);
3078 if (r < 0)
3079 return r;
3080
3081 r = link_set_ipv6_forward(link);
3082 if (r < 0)
3083 return r;
3084
3085 r = link_set_ipv6_privacy_extensions(link);
3086 if (r < 0)
3087 return r;
3088
3089 r = link_set_ipv6_accept_ra(link);
3090 if (r < 0)
3091 return r;
3092
3093 r = link_set_ipv6_dad_transmits(link);
3094 if (r < 0)
3095 return r;
3096
3097 r = link_set_ipv6_hop_limit(link);
3098 if (r < 0)
3099 return r;
3100
3101 r = link_set_flags(link);
3102 if (r < 0)
3103 return r;
3104
3105 r = link_set_ipv6_mtu(link);
3106 if (r < 0)
3107 return r;
3108
3109 if (link_ipv4ll_enabled(link)) {
3110 r = ipv4ll_configure(link);
3111 if (r < 0)
3112 return r;
3113 }
3114
3115 if (link_dhcp4_enabled(link)) {
3116 r = dhcp4_set_promote_secondaries(link);
3117 if (r < 0)
3118 return r;
3119
3120 r = dhcp4_configure(link);
3121 if (r < 0)
3122 return r;
3123 }
3124
3125 if (link_dhcp4_server_enabled(link)) {
3126 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
3127 if (r < 0)
3128 return r;
3129
3130 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
3131 if (r < 0)
3132 return r;
3133 }
3134
3135 if (link_dhcp6_enabled(link) ||
3136 link_ipv6_accept_ra_enabled(link)) {
3137 r = dhcp6_configure(link);
3138 if (r < 0)
3139 return r;
3140 }
3141
3142 if (link_ipv6_accept_ra_enabled(link)) {
3143 r = ndisc_configure(link);
3144 if (r < 0)
3145 return r;
3146 }
3147
3148 if (link_radv_enabled(link)) {
3149 r = radv_configure(link);
3150 if (r < 0)
3151 return r;
3152 }
3153
3154 if (link_lldp_rx_enabled(link)) {
3155 r = sd_lldp_new(&link->lldp);
3156 if (r < 0)
3157 return r;
3158
3159 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
3160 if (r < 0)
3161 return r;
3162
3163 r = sd_lldp_match_capabilities(link->lldp,
3164 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
3165 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
3166 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
3167 if (r < 0)
3168 return r;
3169
3170 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
3171 if (r < 0)
3172 return r;
3173
3174 r = sd_lldp_attach_event(link->lldp, NULL, 0);
3175 if (r < 0)
3176 return r;
3177
3178 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
3179 if (r < 0)
3180 return r;
3181
3182 r = link_update_lldp(link);
3183 if (r < 0)
3184 return r;
3185 }
3186
3187 r = link_set_mtu(link, link->network->mtu, link->network->mtu_is_set);
3188 if (r < 0)
3189 return r;
3190
3191 if (socket_ipv6_is_supported()) {
3192 r = link_configure_addrgen_mode(link);
3193 if (r < 0)
3194 return r;
3195 }
3196
3197 return link_configure_after_setting_mtu(link);
3198 }
3199
3200 static int link_configure_after_setting_mtu(Link *link) {
3201 int r;
3202
3203 assert(link);
3204 assert(link->network);
3205 assert(link->state == LINK_STATE_PENDING);
3206
3207 if (link->setting_mtu)
3208 return 0;
3209
3210 if (link_has_carrier(link) || link->network->configure_without_carrier) {
3211 r = link_acquire_conf(link);
3212 if (r < 0)
3213 return r;
3214 }
3215
3216 return link_enter_join_netdev(link);
3217 }
3218
3219 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3220 assert(duid);
3221
3222 if (duid->raw_data_len > 0)
3223 return 0;
3224
3225 if (duid->type != DUID_TYPE_UUID)
3226 return -EINVAL;
3227
3228 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3229 duid->raw_data_len = sizeof(sd_id128_t);
3230
3231 return 1;
3232 }
3233
3234 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3235 Manager *manager = userdata;
3236 const sd_bus_error *e;
3237 const void *a;
3238 size_t sz;
3239 DUID *duid;
3240 Link *link;
3241 int r;
3242
3243 assert(m);
3244 assert(manager);
3245
3246 e = sd_bus_message_get_error(m);
3247 if (e) {
3248 log_error_errno(sd_bus_error_get_errno(e),
3249 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3250 e->message);
3251 goto configure;
3252 }
3253
3254 r = sd_bus_message_read_array(m, 'y', &a, &sz);
3255 if (r < 0)
3256 goto configure;
3257
3258 if (sz != sizeof(sd_id128_t)) {
3259 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3260 goto configure;
3261 }
3262
3263 memcpy(&manager->product_uuid, a, sz);
3264 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3265 (void) duid_set_uuid(duid, manager->product_uuid);
3266
3267 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3268
3269 configure:
3270 while ((link = set_steal_first(manager->links_requesting_uuid))) {
3271 r = link_configure(link);
3272 if (r < 0)
3273 log_link_error_errno(link, r, "Failed to configure link: %m");
3274 }
3275
3276 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3277
3278 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3279 * even if the method fails. */
3280 manager->has_product_uuid = true;
3281
3282 return 1;
3283 }
3284
3285 static bool link_requires_uuid(Link *link) {
3286 const DUID *duid;
3287
3288 assert(link);
3289 assert(link->manager);
3290 assert(link->network);
3291
3292 duid = link_get_duid(link);
3293 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3294 return false;
3295
3296 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3297 return true;
3298
3299 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3300 return true;
3301
3302 return false;
3303 }
3304
3305 static int link_configure_duid(Link *link) {
3306 Manager *m;
3307 DUID *duid;
3308 int r;
3309
3310 assert(link);
3311 assert(link->manager);
3312 assert(link->network);
3313
3314 m = link->manager;
3315 duid = link_get_duid(link);
3316
3317 if (!link_requires_uuid(link))
3318 return 1;
3319
3320 if (m->has_product_uuid) {
3321 (void) duid_set_uuid(duid, m->product_uuid);
3322 return 1;
3323 }
3324
3325 if (!m->links_requesting_uuid) {
3326 r = manager_request_product_uuid(m, link);
3327 if (r < 0) {
3328 if (r == -ENOMEM)
3329 return r;
3330
3331 log_link_warning_errno(link, r,
3332 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3333 return 1;
3334 }
3335 } else {
3336 r = set_put(m->links_requesting_uuid, link);
3337 if (r < 0)
3338 return log_oom();
3339
3340 r = set_put(m->duids_requesting_uuid, duid);
3341 if (r < 0)
3342 return log_oom();
3343 }
3344
3345 return 0;
3346 }
3347
3348 static int link_initialized_and_synced(Link *link) {
3349 Network *network;
3350 int r;
3351
3352 assert(link);
3353 assert(link->ifname);
3354 assert(link->manager);
3355
3356 if (link->state != LINK_STATE_PENDING)
3357 return 1;
3358
3359 log_link_debug(link, "Link state is up-to-date");
3360
3361 r = link_new_bound_by_list(link);
3362 if (r < 0)
3363 return r;
3364
3365 r = link_handle_bound_by_list(link);
3366 if (r < 0)
3367 return r;
3368
3369 if (!link->network) {
3370 r = network_get(link->manager, link->sd_device, link->ifname,
3371 &link->mac, &network);
3372 if (r == -ENOENT) {
3373 link_enter_unmanaged(link);
3374 return 1;
3375 } else if (r == 0 && network->unmanaged) {
3376 link_enter_unmanaged(link);
3377 return 0;
3378 } else if (r < 0)
3379 return r;
3380
3381 if (link->flags & IFF_LOOPBACK) {
3382 if (network->link_local != ADDRESS_FAMILY_NO)
3383 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3384
3385 if (network->dhcp != ADDRESS_FAMILY_NO)
3386 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3387
3388 if (network->dhcp_server)
3389 log_link_debug(link, "Ignoring DHCP server for loopback link");
3390 }
3391
3392 r = network_apply(network, link);
3393 if (r < 0)
3394 return r;
3395 }
3396
3397 r = link_new_bound_to_list(link);
3398 if (r < 0)
3399 return r;
3400
3401 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3402 * link_configure() is called later asynchronously. */
3403 r = link_configure_duid(link);
3404 if (r <= 0)
3405 return r;
3406
3407 r = link_configure(link);
3408 if (r < 0)
3409 return r;
3410
3411 return 1;
3412 }
3413
3414 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3415 (void) link_initialized_and_synced(link);
3416 return 1;
3417 }
3418
3419 int link_initialized(Link *link, sd_device *device) {
3420 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3421 int r;
3422
3423 assert(link);
3424 assert(link->manager);
3425 assert(link->manager->rtnl);
3426 assert(device);
3427
3428 if (link->state != LINK_STATE_PENDING)
3429 return 0;
3430
3431 if (link->sd_device)
3432 return 0;
3433
3434 log_link_debug(link, "udev initialized link");
3435
3436 link->sd_device = sd_device_ref(device);
3437
3438 /* udev has initialized the link, but we don't know if we have yet
3439 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3440 * when it returns we know that the pending NEWLINKs have already been
3441 * processed and that we are up-to-date */
3442
3443 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3444 link->ifindex);
3445 if (r < 0)
3446 return r;
3447
3448 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3449 link_netlink_destroy_callback, link);
3450 if (r < 0)
3451 return r;
3452
3453 link_ref(link);
3454
3455 return 0;
3456 }
3457
3458 static int link_load(Link *link) {
3459 _cleanup_free_ char *network_file = NULL,
3460 *addresses = NULL,
3461 *routes = NULL,
3462 *dhcp4_address = NULL,
3463 *ipv4ll_address = NULL;
3464 union in_addr_union address;
3465 union in_addr_union route_dst;
3466 const char *p;
3467 int r;
3468
3469 assert(link);
3470
3471 r = parse_env_file(NULL, link->state_file,
3472 "NETWORK_FILE", &network_file,
3473 "ADDRESSES", &addresses,
3474 "ROUTES", &routes,
3475 "DHCP4_ADDRESS", &dhcp4_address,
3476 "IPV4LL_ADDRESS", &ipv4ll_address);
3477 if (r < 0 && r != -ENOENT)
3478 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3479
3480 if (network_file) {
3481 Network *network;
3482 char *suffix;
3483
3484 /* drop suffix */
3485 suffix = strrchr(network_file, '.');
3486 if (!suffix) {
3487 log_link_debug(link, "Failed to get network name from %s", network_file);
3488 goto network_file_fail;
3489 }
3490 *suffix = '\0';
3491
3492 r = network_get_by_name(link->manager, basename(network_file), &network);
3493 if (r < 0) {
3494 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3495 goto network_file_fail;
3496 }
3497
3498 r = network_apply(network, link);
3499 if (r < 0)
3500 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3501 }
3502
3503 network_file_fail:
3504
3505 if (addresses) {
3506 p = addresses;
3507
3508 for (;;) {
3509 _cleanup_free_ char *address_str = NULL;
3510 char *prefixlen_str;
3511 int family;
3512 unsigned char prefixlen;
3513
3514 r = extract_first_word(&p, &address_str, NULL, 0);
3515 if (r < 0) {
3516 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3517 continue;
3518 }
3519 if (r == 0)
3520 break;
3521
3522 prefixlen_str = strchr(address_str, '/');
3523 if (!prefixlen_str) {
3524 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3525 continue;
3526 }
3527
3528 *prefixlen_str++ = '\0';
3529
3530 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3531 if (r != 1) {
3532 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3533 continue;
3534 }
3535
3536 r = in_addr_from_string_auto(address_str, &family, &address);
3537 if (r < 0) {
3538 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3539 continue;
3540 }
3541
3542 r = address_add(link, family, &address, prefixlen, NULL);
3543 if (r < 0)
3544 return log_link_error_errno(link, r, "Failed to add address: %m");
3545 }
3546 }
3547
3548 if (routes) {
3549 p = routes;
3550
3551 for (;;) {
3552 Route *route;
3553 _cleanup_free_ char *route_str = NULL;
3554 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3555 usec_t lifetime;
3556 char *prefixlen_str;
3557 int family;
3558 unsigned char prefixlen, tos, table;
3559 uint32_t priority;
3560
3561 r = extract_first_word(&p, &route_str, NULL, 0);
3562 if (r < 0) {
3563 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3564 continue;
3565 }
3566 if (r == 0)
3567 break;
3568
3569 prefixlen_str = strchr(route_str, '/');
3570 if (!prefixlen_str) {
3571 log_link_debug(link, "Failed to parse route %s", route_str);
3572 continue;
3573 }
3574
3575 *prefixlen_str++ = '\0';
3576
3577 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3578 if (r != 5) {
3579 log_link_debug(link,
3580 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3581 prefixlen_str);
3582 continue;
3583 }
3584
3585 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3586 if (r < 0) {
3587 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3588 continue;
3589 }
3590
3591 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3592 if (r < 0)
3593 return log_link_error_errno(link, r, "Failed to add route: %m");
3594
3595 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3596 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3597 0, route_expire_handler, route);
3598 if (r < 0)
3599 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3600 }
3601
3602 route->lifetime = lifetime;
3603 sd_event_source_unref(route->expire);
3604 route->expire = TAKE_PTR(expire);
3605 }
3606 }
3607
3608 if (dhcp4_address) {
3609 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3610 if (r < 0) {
3611 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3612 goto dhcp4_address_fail;
3613 }
3614
3615 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3616 if (r < 0)
3617 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3618
3619 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3620 if (r < 0)
3621 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3622 }
3623
3624 dhcp4_address_fail:
3625
3626 if (ipv4ll_address) {
3627 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3628 if (r < 0) {
3629 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3630 goto ipv4ll_address_fail;
3631 }
3632
3633 r = sd_ipv4ll_new(&link->ipv4ll);
3634 if (r < 0)
3635 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3636
3637 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3638 if (r < 0)
3639 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3640 }
3641
3642 ipv4ll_address_fail:
3643
3644 return 0;
3645 }
3646
3647 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3648 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3649 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3650 Link *link;
3651 int r;
3652
3653 assert(m);
3654 assert(m->rtnl);
3655 assert(message);
3656 assert(ret);
3657
3658 r = link_new(m, message, ret);
3659 if (r < 0)
3660 return r;
3661
3662 link = *ret;
3663
3664 log_link_debug(link, "Link %d added", link->ifindex);
3665
3666 r = link_load(link);
3667 if (r < 0)
3668 return r;
3669
3670 if (detect_container() <= 0) {
3671 /* not in a container, udev will be around */
3672 sprintf(ifindex_str, "n%d", link->ifindex);
3673 r = sd_device_new_from_device_id(&device, ifindex_str);
3674 if (r < 0) {
3675 log_link_warning_errno(link, r, "Could not find device: %m");
3676 goto failed;
3677 }
3678
3679 r = sd_device_get_is_initialized(device);
3680 if (r < 0) {
3681 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3682 goto failed;
3683 }
3684 if (r == 0) {
3685 /* not yet ready */
3686 log_link_debug(link, "link pending udev initialization...");
3687 return 0;
3688 }
3689
3690 r = device_is_renaming(device);
3691 if (r < 0) {
3692 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3693 goto failed;
3694 }
3695 if (r > 0) {
3696 log_link_debug(link, "Interface is under renaming, pending initialization.");
3697 return 0;
3698 }
3699
3700 r = link_initialized(link, device);
3701 if (r < 0)
3702 goto failed;
3703 } else {
3704 r = link_initialized_and_synced(link);
3705 if (r < 0)
3706 goto failed;
3707 }
3708
3709 return 0;
3710 failed:
3711 link_enter_failed(link);
3712 return r;
3713 }
3714
3715 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3716 int r;
3717
3718 assert(link);
3719
3720 log_link_info(link, "Gained IPv6LL");
3721
3722 link->ipv6ll_address = *address;
3723 link_check_ready(link);
3724
3725 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3726 r = link_acquire_ipv6_conf(link);
3727 if (r < 0) {
3728 link_enter_failed(link);
3729 return r;
3730 }
3731 }
3732
3733 return 0;
3734 }
3735
3736 static int link_carrier_gained(Link *link) {
3737 int r;
3738
3739 assert(link);
3740
3741 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3742 r = link_acquire_conf(link);
3743 if (r < 0) {
3744 link_enter_failed(link);
3745 return r;
3746 }
3747
3748 r = link_request_set_addresses(link);
3749 if (r < 0)
3750 return r;
3751 }
3752
3753 r = link_handle_bound_by_list(link);
3754 if (r < 0)
3755 return r;
3756
3757 return 0;
3758 }
3759
3760 static int link_carrier_lost(Link *link) {
3761 int r;
3762
3763 assert(link);
3764
3765 if (link->network && link->network->ignore_carrier_loss)
3766 return 0;
3767
3768 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3769 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3770 * configuration and stop the clients as well. */
3771 if (link->setting_mtu)
3772 return 0;
3773
3774 r = link_stop_clients(link);
3775 if (r < 0) {
3776 link_enter_failed(link);
3777 return r;
3778 }
3779
3780 if (link_dhcp4_server_enabled(link))
3781 (void) sd_dhcp_server_stop(link->dhcp_server);
3782
3783 r = link_drop_config(link);
3784 if (r < 0)
3785 return r;
3786
3787 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3788 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3789 r = link_drop_foreign_config(link);
3790 if (r < 0)
3791 return r;
3792 }
3793
3794 r = link_handle_bound_by_list(link);
3795 if (r < 0)
3796 return r;
3797
3798 return 0;
3799 }
3800
3801 int link_carrier_reset(Link *link) {
3802 int r;
3803
3804 assert(link);
3805
3806 if (link_has_carrier(link)) {
3807 r = link_carrier_lost(link);
3808 if (r < 0)
3809 return r;
3810
3811 r = link_carrier_gained(link);
3812 if (r < 0)
3813 return r;
3814
3815 log_link_info(link, "Reset carrier");
3816 }
3817
3818 return 0;
3819 }
3820
3821 int link_update(Link *link, sd_netlink_message *m) {
3822 struct ether_addr mac;
3823 const char *ifname;
3824 uint32_t mtu;
3825 bool had_carrier, carrier_gained, carrier_lost;
3826 int r;
3827
3828 assert(link);
3829 assert(link->ifname);
3830 assert(m);
3831
3832 if (link->state == LINK_STATE_LINGER) {
3833 log_link_info(link, "Link readded");
3834 link_set_state(link, LINK_STATE_CONFIGURING);
3835
3836 r = link_new_carrier_maps(link);
3837 if (r < 0)
3838 return r;
3839 }
3840
3841 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3842 if (r >= 0 && !streq(ifname, link->ifname)) {
3843 Manager *manager = link->manager;
3844
3845 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3846
3847 link_drop(link);
3848 r = link_add(manager, m, &link);
3849 if (r < 0)
3850 return r;
3851 }
3852
3853 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3854 if (r >= 0 && mtu > 0) {
3855 link->mtu = mtu;
3856 if (link->original_mtu == 0) {
3857 link->original_mtu = mtu;
3858 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3859 }
3860
3861 if (link->dhcp_client) {
3862 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3863 link->mtu);
3864 if (r < 0)
3865 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3866 }
3867
3868 if (link->radv) {
3869 r = sd_radv_set_mtu(link->radv, link->mtu);
3870 if (r < 0)
3871 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3872 }
3873 }
3874
3875 /* The kernel may broadcast NEWLINK messages without the MAC address
3876 set, simply ignore them. */
3877 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3878 if (r >= 0) {
3879 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3880 ETH_ALEN)) {
3881
3882 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3883 ETH_ALEN);
3884
3885 log_link_debug(link, "MAC address: "
3886 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3887 mac.ether_addr_octet[0],
3888 mac.ether_addr_octet[1],
3889 mac.ether_addr_octet[2],
3890 mac.ether_addr_octet[3],
3891 mac.ether_addr_octet[4],
3892 mac.ether_addr_octet[5]);
3893
3894 if (link->ipv4ll) {
3895 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3896 if (r < 0)
3897 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3898 }
3899
3900 if (link->dhcp_client) {
3901 r = sd_dhcp_client_set_mac(link->dhcp_client,
3902 (const uint8_t *) &link->mac,
3903 sizeof (link->mac),
3904 ARPHRD_ETHER);
3905 if (r < 0)
3906 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3907
3908 r = dhcp4_set_client_identifier(link);
3909 if (r < 0)
3910 return r;
3911 }
3912
3913 if (link->dhcp6_client) {
3914 const DUID* duid = link_get_duid(link);
3915
3916 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3917 (const uint8_t *) &link->mac,
3918 sizeof (link->mac),
3919 ARPHRD_ETHER);
3920 if (r < 0)
3921 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3922
3923 if (link->network->iaid_set) {
3924 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3925 link->network->iaid);
3926 if (r < 0)
3927 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3928 }
3929
3930 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3931 duid->type,
3932 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3933 duid->raw_data_len);
3934 if (r < 0)
3935 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3936 }
3937
3938 if (link->radv) {
3939 r = sd_radv_set_mac(link->radv, &link->mac);
3940 if (r < 0)
3941 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3942 }
3943
3944 if (link->ndisc) {
3945 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3946 if (r < 0)
3947 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3948 }
3949 }
3950 }
3951
3952 had_carrier = link_has_carrier(link);
3953
3954 r = link_update_flags(link, m);
3955 if (r < 0)
3956 return r;
3957
3958 r = link_update_lldp(link);
3959 if (r < 0)
3960 return r;
3961
3962 carrier_gained = !had_carrier && link_has_carrier(link);
3963 carrier_lost = had_carrier && !link_has_carrier(link);
3964
3965 if (carrier_gained) {
3966 log_link_info(link, "Gained carrier");
3967
3968 r = link_carrier_gained(link);
3969 if (r < 0)
3970 return r;
3971 } else if (carrier_lost) {
3972 log_link_info(link, "Lost carrier");
3973
3974 r = link_carrier_lost(link);
3975 if (r < 0)
3976 return r;
3977 }
3978
3979 return 0;
3980 }
3981
3982 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3983 bool space = false;
3984 Iterator i;
3985 Link *link;
3986
3987 assert(f);
3988 assert(prefix);
3989
3990 if (hashmap_isempty(h))
3991 return;
3992
3993 fputs(prefix, f);
3994 HASHMAP_FOREACH(link, h, i) {
3995 if (space)
3996 fputc(' ', f);
3997
3998 fprintf(f, "%i", link->ifindex);
3999 space = true;
4000 }
4001
4002 fputc('\n', f);
4003 }
4004
4005 int link_save(Link *link) {
4006 _cleanup_free_ char *temp_path = NULL;
4007 _cleanup_fclose_ FILE *f = NULL;
4008 const char *admin_state, *oper_state;
4009 Address *a;
4010 Route *route;
4011 Iterator i;
4012 int r;
4013
4014 assert(link);
4015 assert(link->state_file);
4016 assert(link->lease_file);
4017 assert(link->manager);
4018
4019 if (link->state == LINK_STATE_LINGER) {
4020 (void) unlink(link->state_file);
4021 return 0;
4022 }
4023
4024 link_lldp_save(link);
4025
4026 admin_state = link_state_to_string(link->state);
4027 assert(admin_state);
4028
4029 oper_state = link_operstate_to_string(link->operstate);
4030 assert(oper_state);
4031
4032 r = fopen_temporary(link->state_file, &f, &temp_path);
4033 if (r < 0)
4034 goto fail;
4035
4036 (void) fchmod(fileno(f), 0644);
4037
4038 fprintf(f,
4039 "# This is private data. Do not parse.\n"
4040 "ADMIN_STATE=%s\n"
4041 "OPER_STATE=%s\n",
4042 admin_state, oper_state);
4043
4044 if (link->network) {
4045 bool space;
4046 sd_dhcp6_lease *dhcp6_lease = NULL;
4047 const char *dhcp_domainname = NULL;
4048 char **dhcp6_domains = NULL;
4049 char **dhcp_domains = NULL;
4050 unsigned j;
4051
4052 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4053 yes_no(link->network->required_for_online));
4054
4055 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
4056 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
4057
4058 if (link->dhcp6_client) {
4059 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
4060 if (r < 0 && r != -ENOMSG)
4061 log_link_debug(link, "No DHCPv6 lease");
4062 }
4063
4064 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4065
4066 fputs("DNS=", f);
4067 space = false;
4068
4069 for (j = 0; j < link->network->n_dns; j++) {
4070 _cleanup_free_ char *b = NULL;
4071
4072 r = in_addr_to_string(link->network->dns[j].family,
4073 &link->network->dns[j].address, &b);
4074 if (r < 0) {
4075 log_debug_errno(r, "Failed to format address, ignoring: %m");
4076 continue;
4077 }
4078
4079 if (space)
4080 fputc(' ', f);
4081 fputs(b, f);
4082 space = true;
4083 }
4084
4085 if (link->network->dhcp_use_dns &&
4086 link->dhcp_lease) {
4087 const struct in_addr *addresses;
4088
4089 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
4090 if (r > 0)
4091 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4092 space = true;
4093 }
4094
4095 if (link->network->dhcp_use_dns && dhcp6_lease) {
4096 struct in6_addr *in6_addrs;
4097
4098 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
4099 if (r > 0) {
4100 if (space)
4101 fputc(' ', f);
4102 serialize_in6_addrs(f, in6_addrs, r);
4103 space = true;
4104 }
4105 }
4106
4107 /* Make sure to flush out old entries before we use the NDISC data */
4108 ndisc_vacuum(link);
4109
4110 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4111 NDiscRDNSS *dd;
4112
4113 SET_FOREACH(dd, link->ndisc_rdnss, i) {
4114 if (space)
4115 fputc(' ', f);
4116
4117 serialize_in6_addrs(f, &dd->address, 1);
4118 space = true;
4119 }
4120 }
4121
4122 fputc('\n', f);
4123
4124 fputs("NTP=", f);
4125 space = false;
4126 fputstrv(f, link->network->ntp, NULL, &space);
4127
4128 if (link->network->dhcp_use_ntp &&
4129 link->dhcp_lease) {
4130 const struct in_addr *addresses;
4131
4132 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
4133 if (r > 0)
4134 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4135 space = true;
4136 }
4137
4138 if (link->network->dhcp_use_ntp && dhcp6_lease) {
4139 struct in6_addr *in6_addrs;
4140 char **hosts;
4141
4142 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
4143 &in6_addrs);
4144 if (r > 0) {
4145 if (space)
4146 fputc(' ', f);
4147 serialize_in6_addrs(f, in6_addrs, r);
4148 space = true;
4149 }
4150
4151 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
4152 if (r > 0)
4153 fputstrv(f, hosts, NULL, &space);
4154 }
4155
4156 fputc('\n', f);
4157
4158 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4159 if (link->dhcp_lease) {
4160 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4161 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4162 }
4163 if (dhcp6_lease)
4164 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4165 }
4166
4167 ordered_set_print(f, "DOMAINS=", link->network->search_domains);
4168
4169 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4170 NDiscDNSSL *dd;
4171
4172 if (dhcp_domainname)
4173 fputs_with_space(f, dhcp_domainname, NULL, &space);
4174 if (dhcp_domains)
4175 fputstrv(f, dhcp_domains, NULL, &space);
4176 if (dhcp6_domains)
4177 fputstrv(f, dhcp6_domains, NULL, &space);
4178
4179 SET_FOREACH(dd, link->ndisc_dnssl, i)
4180 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4181 }
4182
4183 fputc('\n', f);
4184
4185 ordered_set_print(f, "ROUTE_DOMAINS=", link->network->route_domains);
4186
4187 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4188 NDiscDNSSL *dd;
4189
4190 if (dhcp_domainname)
4191 fputs_with_space(f, dhcp_domainname, NULL, &space);
4192 if (dhcp_domains)
4193 fputstrv(f, dhcp_domains, NULL, &space);
4194 if (dhcp6_domains)
4195 fputstrv(f, dhcp6_domains, NULL, &space);
4196
4197 SET_FOREACH(dd, link->ndisc_dnssl, i)
4198 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4199 }
4200
4201 fputc('\n', f);
4202
4203 fprintf(f, "LLMNR=%s\n",
4204 resolve_support_to_string(link->network->llmnr));
4205 fprintf(f, "MDNS=%s\n",
4206 resolve_support_to_string(link->network->mdns));
4207 if (link->network->dns_default_route >= 0)
4208 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
4209
4210 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4211 fprintf(f, "DNS_OVER_TLS=%s\n",
4212 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
4213
4214 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
4215 fprintf(f, "DNSSEC=%s\n",
4216 dnssec_mode_to_string(link->network->dnssec_mode));
4217
4218 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
4219 const char *n;
4220
4221 fputs("DNSSEC_NTA=", f);
4222 space = false;
4223 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
4224 fputs_with_space(f, n, NULL, &space);
4225 fputc('\n', f);
4226 }
4227
4228 fputs("ADDRESSES=", f);
4229 space = false;
4230 SET_FOREACH(a, link->addresses, i) {
4231 _cleanup_free_ char *address_str = NULL;
4232
4233 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4234 if (r < 0)
4235 goto fail;
4236
4237 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4238 space = true;
4239 }
4240 fputc('\n', f);
4241
4242 fputs("ROUTES=", f);
4243 space = false;
4244 SET_FOREACH(route, link->routes, i) {
4245 _cleanup_free_ char *route_str = NULL;
4246
4247 r = in_addr_to_string(route->family, &route->dst, &route_str);
4248 if (r < 0)
4249 goto fail;
4250
4251 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4252 space ? " " : "", route_str,
4253 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4254 space = true;
4255 }
4256
4257 fputc('\n', f);
4258 }
4259
4260 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4261 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4262
4263 if (link->dhcp_lease) {
4264 struct in_addr address;
4265 const char *tz = NULL;
4266
4267 assert(link->network);
4268
4269 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
4270 if (r >= 0)
4271 fprintf(f, "TIMEZONE=%s\n", tz);
4272
4273 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
4274 if (r >= 0) {
4275 fputs("DHCP4_ADDRESS=", f);
4276 serialize_in_addrs(f, &address, 1, false, NULL);
4277 fputc('\n', f);
4278 }
4279
4280 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4281 if (r < 0)
4282 goto fail;
4283
4284 fprintf(f,
4285 "DHCP_LEASE=%s\n",
4286 link->lease_file);
4287 } else
4288 (void) unlink(link->lease_file);
4289
4290 if (link->ipv4ll) {
4291 struct in_addr address;
4292
4293 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4294 if (r >= 0) {
4295 fputs("IPV4LL_ADDRESS=", f);
4296 serialize_in_addrs(f, &address, 1, false, NULL);
4297 fputc('\n', f);
4298 }
4299 }
4300
4301 r = fflush_and_check(f);
4302 if (r < 0)
4303 goto fail;
4304
4305 if (rename(temp_path, link->state_file) < 0) {
4306 r = -errno;
4307 goto fail;
4308 }
4309
4310 return 0;
4311
4312 fail:
4313 (void) unlink(link->state_file);
4314 if (temp_path)
4315 (void) unlink(temp_path);
4316
4317 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4318 }
4319
4320 /* The serialized state in /run is no longer up-to-date. */
4321 void link_dirty(Link *link) {
4322 int r;
4323
4324 assert(link);
4325
4326 /* mark manager dirty as link is dirty */
4327 manager_dirty(link->manager);
4328
4329 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
4330 if (r < 0)
4331 /* allocation errors are ignored */
4332 return;
4333
4334 r = set_put(link->manager->dirty_links, link);
4335 if (r <= 0)
4336 /* don't take another ref if the link was already dirty */
4337 return;
4338
4339 link_ref(link);
4340 }
4341
4342 /* The serialized state in /run is up-to-date */
4343 void link_clean(Link *link) {
4344 assert(link);
4345 assert(link->manager);
4346
4347 link_unref(set_remove(link->manager->dirty_links, link));
4348 }
4349
4350 static const char* const link_state_table[_LINK_STATE_MAX] = {
4351 [LINK_STATE_PENDING] = "pending",
4352 [LINK_STATE_CONFIGURING] = "configuring",
4353 [LINK_STATE_CONFIGURED] = "configured",
4354 [LINK_STATE_UNMANAGED] = "unmanaged",
4355 [LINK_STATE_FAILED] = "failed",
4356 [LINK_STATE_LINGER] = "linger",
4357 };
4358
4359 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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