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Merge pull request #11993 from poettering/resolved-stub-edns-size
[thirdparty/systemd.git] / src / network / networkd-link.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <netinet/ether.h>
4 #include <linux/if.h>
5 #include <linux/can/netlink.h>
6 #include <unistd.h>
7 #include <stdio_ext.h>
8
9 #include "alloc-util.h"
10 #include "bus-util.h"
11 #include "dhcp-identifier.h"
12 #include "dhcp-lease-internal.h"
13 #include "env-file.h"
14 #include "fd-util.h"
15 #include "fileio.h"
16 #include "missing_network.h"
17 #include "netdev/vrf.h"
18 #include "netlink-util.h"
19 #include "network-internal.h"
20 #include "networkd-ipv6-proxy-ndp.h"
21 #include "networkd-lldp-tx.h"
22 #include "networkd-manager.h"
23 #include "networkd-ndisc.h"
24 #include "networkd-neighbor.h"
25 #include "networkd-radv.h"
26 #include "networkd-routing-policy-rule.h"
27 #include "set.h"
28 #include "socket-util.h"
29 #include "stdio-util.h"
30 #include "string-table.h"
31 #include "strv.h"
32 #include "sysctl-util.h"
33 #include "tmpfile-util.h"
34 #include "udev-util.h"
35 #include "util.h"
36 #include "virt.h"
37
38 uint32_t link_get_vrf_table(Link *link) {
39 return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
40 }
41
42 uint32_t link_get_dhcp_route_table(Link *link) {
43 /* When the interface is part of an VRF use the VRFs routing table, unless
44 * another table is explicitly specified. */
45 if (link->network->dhcp_route_table_set)
46 return link->network->dhcp_route_table;
47 return link_get_vrf_table(link);
48 }
49
50 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
51 if (link->network->ipv6_accept_ra_route_table_set)
52 return link->network->ipv6_accept_ra_route_table;
53 return link_get_vrf_table(link);
54 }
55
56 DUID* link_get_duid(Link *link) {
57 if (link->network->duid.type != _DUID_TYPE_INVALID)
58 return &link->network->duid;
59 else
60 return &link->manager->duid;
61 }
62
63 static bool link_dhcp6_enabled(Link *link) {
64 assert(link);
65
66 if (!socket_ipv6_is_supported())
67 return false;
68
69 if (link->flags & IFF_LOOPBACK)
70 return false;
71
72 if (!link->network)
73 return false;
74
75 if (link->network->bond)
76 return false;
77
78 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
79 return false;
80
81 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
82 }
83
84 static bool link_dhcp4_enabled(Link *link) {
85 assert(link);
86
87 if (link->flags & IFF_LOOPBACK)
88 return false;
89
90 if (!link->network)
91 return false;
92
93 if (link->network->bond)
94 return false;
95
96 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
97 }
98
99 static bool link_dhcp4_server_enabled(Link *link) {
100 assert(link);
101
102 if (link->flags & IFF_LOOPBACK)
103 return false;
104
105 if (!link->network)
106 return false;
107
108 if (link->network->bond)
109 return false;
110
111 return link->network->dhcp_server;
112 }
113
114 static bool link_ipv4ll_enabled(Link *link) {
115 assert(link);
116
117 if (link->flags & IFF_LOOPBACK)
118 return false;
119
120 if (!link->network)
121 return false;
122
123 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard"))
124 return false;
125
126 if (link->network->bond)
127 return false;
128
129 return link->network->link_local & ADDRESS_FAMILY_IPV4;
130 }
131
132 static bool link_ipv6ll_enabled(Link *link) {
133 assert(link);
134
135 if (!socket_ipv6_is_supported())
136 return false;
137
138 if (link->flags & IFF_LOOPBACK)
139 return false;
140
141 if (!link->network)
142 return false;
143
144 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard"))
145 return false;
146
147 if (link->network->bond)
148 return false;
149
150 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
151 return false;
152
153 return link->network->link_local & ADDRESS_FAMILY_IPV6;
154 }
155
156 static bool link_ipv6_enabled(Link *link) {
157 assert(link);
158
159 if (!socket_ipv6_is_supported())
160 return false;
161
162 if (link->network->bond)
163 return false;
164
165 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
166 return false;
167
168 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
169 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
170 }
171
172 static bool link_radv_enabled(Link *link) {
173 assert(link);
174
175 if (!link_ipv6ll_enabled(link))
176 return false;
177
178 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
179 }
180
181 static bool link_lldp_rx_enabled(Link *link) {
182 assert(link);
183
184 if (link->flags & IFF_LOOPBACK)
185 return false;
186
187 if (link->iftype != ARPHRD_ETHER)
188 return false;
189
190 if (!link->network)
191 return false;
192
193 /* LLDP should be handled on bridge slaves as those have a direct
194 * connection to their peers not on the bridge master. Linux doesn't
195 * even (by default) forward lldp packets to the bridge master.*/
196 if (streq_ptr("bridge", link->kind))
197 return false;
198
199 return link->network->lldp_mode != LLDP_MODE_NO;
200 }
201
202 static bool link_lldp_emit_enabled(Link *link) {
203 assert(link);
204
205 if (link->flags & IFF_LOOPBACK)
206 return false;
207
208 if (link->iftype != ARPHRD_ETHER)
209 return false;
210
211 if (!link->network)
212 return false;
213
214 return link->network->lldp_emit != LLDP_EMIT_NO;
215 }
216
217 static bool link_ipv4_forward_enabled(Link *link) {
218 assert(link);
219
220 if (link->flags & IFF_LOOPBACK)
221 return false;
222
223 if (!link->network)
224 return false;
225
226 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
227 return false;
228
229 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
230 }
231
232 static bool link_ipv6_forward_enabled(Link *link) {
233 assert(link);
234
235 if (!socket_ipv6_is_supported())
236 return false;
237
238 if (link->flags & IFF_LOOPBACK)
239 return false;
240
241 if (!link->network)
242 return false;
243
244 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
245 return false;
246
247 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
248 return false;
249
250 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
251 }
252
253 static bool link_proxy_arp_enabled(Link *link) {
254 assert(link);
255
256 if (link->flags & IFF_LOOPBACK)
257 return false;
258
259 if (!link->network)
260 return false;
261
262 if (link->network->proxy_arp < 0)
263 return false;
264
265 return true;
266 }
267
268 static bool link_ipv6_accept_ra_enabled(Link *link) {
269 assert(link);
270
271 if (!socket_ipv6_is_supported())
272 return false;
273
274 if (link->flags & IFF_LOOPBACK)
275 return false;
276
277 if (!link->network)
278 return false;
279
280 if (!link_ipv6ll_enabled(link))
281 return false;
282
283 /* If unset use system default (enabled if local forwarding is disabled.
284 * disabled if local forwarding is enabled).
285 * If set, ignore or enforce RA independent of local forwarding state.
286 */
287 if (link->network->ipv6_accept_ra < 0)
288 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
289 return !link_ipv6_forward_enabled(link);
290 else if (link->network->ipv6_accept_ra > 0)
291 /* accept RA even if ip_forward is enabled */
292 return true;
293 else
294 /* ignore RA */
295 return false;
296 }
297
298 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
299 assert(link);
300
301 if (!socket_ipv6_is_supported())
302 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
303
304 if (link->flags & IFF_LOOPBACK)
305 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
306
307 if (!link->network)
308 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
309
310 return link->network->ipv6_privacy_extensions;
311 }
312
313 static int link_enable_ipv6(Link *link) {
314 bool disabled;
315 int r;
316
317 if (link->flags & IFF_LOOPBACK)
318 return 0;
319
320 disabled = !link_ipv6_enabled(link);
321
322 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", disabled);
323 if (r < 0)
324 log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m",
325 enable_disable(!disabled), link->ifname);
326 else
327 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
328
329 return 0;
330 }
331
332 static bool link_is_enslaved(Link *link) {
333 if (link->flags & IFF_SLAVE)
334 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
335 return true;
336
337 if (!link->enslaved_raw)
338 return false;
339
340 if (!link->network)
341 return false;
342
343 if (link->network->bridge)
344 /* TODO: support the case when link is not managed by networkd. */
345 return true;
346
347 return false;
348 }
349
350 static void link_update_master_operstate(Link *link, NetDev *netdev) {
351 Link *master;
352
353 if (!netdev)
354 return;
355
356 if (link_get(link->manager, netdev->ifindex, &master) < 0)
357 return;
358
359 link_update_operstate(master, true);
360 }
361
362 void link_update_operstate(Link *link, bool also_update_master) {
363 LinkOperationalState operstate;
364 Iterator i;
365
366 assert(link);
367
368 if (link->kernel_operstate == IF_OPER_DORMANT)
369 operstate = LINK_OPERSTATE_DORMANT;
370 else if (link_has_carrier(link)) {
371 Address *address;
372 uint8_t scope = RT_SCOPE_NOWHERE;
373
374 /* if we have carrier, check what addresses we have */
375 SET_FOREACH(address, link->addresses, i) {
376 if (!address_is_ready(address))
377 continue;
378
379 if (address->scope < scope)
380 scope = address->scope;
381 }
382
383 /* for operstate we also take foreign addresses into account */
384 SET_FOREACH(address, link->addresses_foreign, i) {
385 if (!address_is_ready(address))
386 continue;
387
388 if (address->scope < scope)
389 scope = address->scope;
390 }
391
392 if (scope < RT_SCOPE_SITE)
393 /* universally accessible addresses found */
394 operstate = LINK_OPERSTATE_ROUTABLE;
395 else if (scope < RT_SCOPE_HOST)
396 /* only link or site local addresses found */
397 operstate = LINK_OPERSTATE_DEGRADED;
398 else
399 /* no useful addresses found */
400 operstate = LINK_OPERSTATE_CARRIER;
401 } else if (link->flags & IFF_UP)
402 operstate = LINK_OPERSTATE_NO_CARRIER;
403 else
404 operstate = LINK_OPERSTATE_OFF;
405
406 if (IN_SET(operstate, LINK_OPERSTATE_DEGRADED, LINK_OPERSTATE_CARRIER) &&
407 link_is_enslaved(link))
408 operstate = LINK_OPERSTATE_ENSLAVED;
409
410 if (operstate >= LINK_OPERSTATE_CARRIER) {
411 Link *slave;
412
413 HASHMAP_FOREACH(slave, link->slaves, i) {
414 link_update_operstate(slave, false);
415
416 if (slave->operstate < LINK_OPERSTATE_CARRIER)
417 operstate = LINK_OPERSTATE_DEGRADED_CARRIER;
418 }
419 }
420
421 if (link->operstate != operstate) {
422 link->operstate = operstate;
423 link_send_changed(link, "OperationalState", NULL);
424 link_dirty(link);
425 }
426
427 if (also_update_master && link->network) {
428 link_update_master_operstate(link, link->network->bond);
429 link_update_master_operstate(link, link->network->bridge);
430 }
431 }
432
433 #define FLAG_STRING(string, flag, old, new) \
434 (((old ^ new) & flag) \
435 ? ((old & flag) ? (" -" string) : (" +" string)) \
436 : "")
437
438 static int link_update_flags(Link *link, sd_netlink_message *m) {
439 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
440 uint8_t operstate;
441 int r;
442
443 assert(link);
444
445 r = sd_rtnl_message_link_get_flags(m, &flags);
446 if (r < 0)
447 return log_link_warning_errno(link, r, "Could not get link flags: %m");
448
449 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
450 if (r < 0)
451 /* if we got a message without operstate, take it to mean
452 the state was unchanged */
453 operstate = link->kernel_operstate;
454
455 if ((link->flags == flags) && (link->kernel_operstate == operstate))
456 return 0;
457
458 if (link->flags != flags) {
459 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",
460 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
461 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
462 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
463 FLAG_STRING("UP", IFF_UP, link->flags, flags),
464 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
465 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
466 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
467 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
468 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
469 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
470 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
471 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
472 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
473 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
474 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
475 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
476 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
477 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
478 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
479
480 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
481 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
482 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
483 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
484 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
485 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
486 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
487 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
488
489 /* link flags are currently at most 18 bits, let's align to
490 * printing 20 */
491 if (unknown_flags_added)
492 log_link_debug(link,
493 "Unknown link flags gained: %#.5x (ignoring)",
494 unknown_flags_added);
495
496 if (unknown_flags_removed)
497 log_link_debug(link,
498 "Unknown link flags lost: %#.5x (ignoring)",
499 unknown_flags_removed);
500 }
501
502 link->flags = flags;
503 link->kernel_operstate = operstate;
504
505 link_update_operstate(link, true);
506
507 return 0;
508 }
509
510 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_unref);
511
512 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
513 _cleanup_(link_unrefp) Link *link = NULL;
514 uint16_t type;
515 const char *ifname, *kind = NULL;
516 int r, ifindex;
517 unsigned short iftype;
518
519 assert(manager);
520 assert(message);
521 assert(ret);
522
523 /* check for link kind */
524 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
525 if (r == 0) {
526 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
527 r = sd_netlink_message_exit_container(message);
528 if (r < 0)
529 return r;
530 }
531
532 r = sd_netlink_message_get_type(message, &type);
533 if (r < 0)
534 return r;
535 else if (type != RTM_NEWLINK)
536 return -EINVAL;
537
538 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
539 if (r < 0)
540 return r;
541 else if (ifindex <= 0)
542 return -EINVAL;
543
544 r = sd_rtnl_message_link_get_type(message, &iftype);
545 if (r < 0)
546 return r;
547
548 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
549 if (r < 0)
550 return r;
551
552 link = new(Link, 1);
553 if (!link)
554 return -ENOMEM;
555
556 *link = (Link) {
557 .n_ref = 1,
558 .manager = manager,
559 .state = LINK_STATE_PENDING,
560 .rtnl_extended_attrs = true,
561 .ifindex = ifindex,
562 .iftype = iftype,
563 };
564
565 link->ifname = strdup(ifname);
566 if (!link->ifname)
567 return -ENOMEM;
568
569 if (kind) {
570 link->kind = strdup(kind);
571 if (!link->kind)
572 return -ENOMEM;
573 }
574
575 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
576 if (r < 0)
577 log_link_debug_errno(link, r, "New device has no master, continuing without");
578
579 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
580 if (r < 0)
581 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
582
583 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
584 return -ENOMEM;
585
586 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
587 return -ENOMEM;
588
589 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
590 return -ENOMEM;
591
592 r = hashmap_ensure_allocated(&manager->links, NULL);
593 if (r < 0)
594 return r;
595
596 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
597 if (r < 0)
598 return r;
599
600 r = link_update_flags(link, message);
601 if (r < 0)
602 return r;
603
604 *ret = TAKE_PTR(link);
605
606 return 0;
607 }
608
609 static void link_detach_from_manager(Link *link) {
610 if (!link || !link->manager)
611 return;
612
613 hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex));
614 set_remove(link->manager->links_requesting_uuid, link);
615 link_clean(link);
616 }
617
618 static Link *link_free(Link *link) {
619 Link *carrier, *master;
620 Address *address;
621 Route *route;
622 Iterator i;
623
624 assert(link);
625
626 while ((route = set_first(link->routes)))
627 route_free(route);
628
629 while ((route = set_first(link->routes_foreign)))
630 route_free(route);
631
632 link->routes = set_free(link->routes);
633 link->routes_foreign = set_free(link->routes_foreign);
634
635 while ((address = set_first(link->addresses)))
636 address_free(address);
637
638 while ((address = set_first(link->addresses_foreign)))
639 address_free(address);
640
641 link->addresses = set_free(link->addresses);
642 link->addresses_foreign = set_free(link->addresses_foreign);
643
644 while ((address = link->pool_addresses)) {
645 LIST_REMOVE(addresses, link->pool_addresses, address);
646 address_free(address);
647 }
648
649 sd_dhcp_server_unref(link->dhcp_server);
650 sd_dhcp_client_unref(link->dhcp_client);
651 sd_dhcp_lease_unref(link->dhcp_lease);
652
653 link_lldp_emit_stop(link);
654
655 free(link->lease_file);
656
657 sd_lldp_unref(link->lldp);
658 free(link->lldp_file);
659
660 ndisc_flush(link);
661
662 sd_ipv4ll_unref(link->ipv4ll);
663 sd_dhcp6_client_unref(link->dhcp6_client);
664 sd_ndisc_unref(link->ndisc);
665 sd_radv_unref(link->radv);
666
667 link_detach_from_manager(link);
668
669 free(link->ifname);
670
671 free(link->kind);
672
673 (void) unlink(link->state_file);
674 free(link->state_file);
675
676 sd_device_unref(link->sd_device);
677
678 HASHMAP_FOREACH (carrier, link->bound_to_links, i)
679 hashmap_remove(link->bound_to_links, INT_TO_PTR(carrier->ifindex));
680 hashmap_free(link->bound_to_links);
681
682 HASHMAP_FOREACH (carrier, link->bound_by_links, i)
683 hashmap_remove(link->bound_by_links, INT_TO_PTR(carrier->ifindex));
684 hashmap_free(link->bound_by_links);
685
686 hashmap_free(link->slaves);
687
688 if (link->network) {
689 if (link->network->bond &&
690 link_get(link->manager, link->network->bond->ifindex, &master) >= 0)
691 (void) hashmap_remove(master->slaves, INT_TO_PTR(link->ifindex));
692
693 if (link->network->bridge &&
694 link_get(link->manager, link->network->bridge->ifindex, &master) >= 0)
695 (void) hashmap_remove(master->slaves, INT_TO_PTR(link->ifindex));
696 }
697
698 return mfree(link);
699 }
700
701 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
702
703 int link_get(Manager *m, int ifindex, Link **ret) {
704 Link *link;
705
706 assert(m);
707 assert(ifindex);
708 assert(ret);
709
710 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
711 if (!link)
712 return -ENODEV;
713
714 *ret = link;
715
716 return 0;
717 }
718
719 static void link_set_state(Link *link, LinkState state) {
720 assert(link);
721
722 if (link->state == state)
723 return;
724
725 link->state = state;
726
727 link_send_changed(link, "AdministrativeState", NULL);
728 }
729
730 static void link_enter_unmanaged(Link *link) {
731 assert(link);
732
733 log_link_debug(link, "Unmanaged");
734
735 link_set_state(link, LINK_STATE_UNMANAGED);
736
737 link_dirty(link);
738 }
739
740 static int link_stop_clients(Link *link) {
741 int r = 0, k;
742
743 assert(link);
744 assert(link->manager);
745 assert(link->manager->event);
746
747 if (link->dhcp_client) {
748 k = sd_dhcp_client_stop(link->dhcp_client);
749 if (k < 0)
750 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
751 }
752
753 if (link->ipv4ll) {
754 k = sd_ipv4ll_stop(link->ipv4ll);
755 if (k < 0)
756 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
757 }
758
759 if (link->dhcp6_client) {
760 k = sd_dhcp6_client_stop(link->dhcp6_client);
761 if (k < 0)
762 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
763 }
764
765 if (link->ndisc) {
766 k = sd_ndisc_stop(link->ndisc);
767 if (k < 0)
768 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
769 }
770
771 if (link->radv) {
772 k = sd_radv_stop(link->radv);
773 if (k < 0)
774 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
775 }
776
777 link_lldp_emit_stop(link);
778 return r;
779 }
780
781 void link_enter_failed(Link *link) {
782 assert(link);
783
784 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
785 return;
786
787 log_link_warning(link, "Failed");
788
789 link_set_state(link, LINK_STATE_FAILED);
790
791 link_stop_clients(link);
792
793 link_dirty(link);
794 }
795
796 static Address* link_find_dhcp_server_address(Link *link) {
797 Address *address;
798
799 assert(link);
800 assert(link->network);
801
802 /* The first statically configured address if there is any */
803 LIST_FOREACH(addresses, address, link->network->static_addresses) {
804
805 if (address->family != AF_INET)
806 continue;
807
808 if (in_addr_is_null(address->family, &address->in_addr))
809 continue;
810
811 return address;
812 }
813
814 /* If that didn't work, find a suitable address we got from the pool */
815 LIST_FOREACH(addresses, address, link->pool_addresses) {
816 if (address->family != AF_INET)
817 continue;
818
819 return address;
820 }
821
822 return NULL;
823 }
824
825 static int link_join_netdevs_after_configured(Link *link) {
826 NetDev *netdev;
827 Iterator i;
828 int r;
829
830 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
831 if (netdev->ifindex > 0)
832 /* Assume already enslaved. */
833 continue;
834
835 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
836 continue;
837
838 log_struct(LOG_DEBUG,
839 LOG_LINK_INTERFACE(link),
840 LOG_NETDEV_INTERFACE(netdev),
841 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
842
843 r = netdev_join(netdev, link, NULL);
844 if (r < 0)
845 return log_struct_errno(LOG_WARNING, r,
846 LOG_LINK_INTERFACE(link),
847 LOG_NETDEV_INTERFACE(netdev),
848 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
849 }
850
851 return 0;
852 }
853
854 static void link_enter_configured(Link *link) {
855 assert(link);
856 assert(link->network);
857
858 if (link->state != LINK_STATE_CONFIGURING)
859 return;
860
861 log_link_info(link, "Configured");
862
863 link_set_state(link, LINK_STATE_CONFIGURED);
864
865 (void) link_join_netdevs_after_configured(link);
866
867 link_dirty(link);
868 }
869
870 static int link_request_set_routing_policy_rule(Link *link) {
871 RoutingPolicyRule *rule, *rrule = NULL;
872 int r;
873
874 assert(link);
875 assert(link->network);
876
877 link_set_state(link, LINK_STATE_CONFIGURING);
878 link->routing_policy_rules_configured = false;
879
880 LIST_FOREACH(rules, rule, link->network->rules) {
881 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
882 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif,
883 rule->protocol, &rule->sport, &rule->dport, &rrule);
884 if (r == 0) {
885 (void) routing_policy_rule_make_local(link->manager, rrule);
886 continue;
887 }
888
889 r = routing_policy_rule_configure(rule, link, NULL, false);
890 if (r < 0) {
891 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
892 link_enter_failed(link);
893 return r;
894 }
895
896 link->routing_policy_rule_messages++;
897 }
898
899 routing_policy_rule_purge(link->manager, link);
900 if (link->routing_policy_rule_messages == 0) {
901 link->routing_policy_rules_configured = true;
902 link_check_ready(link);
903 } else
904 log_link_debug(link, "Setting routing policy rules");
905
906 return 0;
907 }
908
909 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
910 int r;
911
912 assert(link);
913 assert(link->route_messages > 0);
914 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
915 LINK_STATE_FAILED, LINK_STATE_LINGER));
916
917 link->route_messages--;
918
919 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
920 return 1;
921
922 r = sd_netlink_message_get_errno(m);
923 if (r < 0 && r != -EEXIST)
924 log_link_warning_errno(link, r, "Could not set route: %m");
925
926 if (link->route_messages == 0) {
927 log_link_debug(link, "Routes set");
928 link->static_routes_configured = true;
929 link_check_ready(link);
930 }
931
932 return 1;
933 }
934
935 static int link_request_set_routes(Link *link) {
936 enum {
937 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
938 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
939 _PHASE_MAX
940 } phase;
941 Route *rt;
942 int r;
943
944 assert(link);
945 assert(link->network);
946 assert(link->addresses_configured);
947 assert(link->address_messages == 0);
948 assert(link->state != _LINK_STATE_INVALID);
949
950 link_set_state(link, LINK_STATE_CONFIGURING);
951 link->static_routes_configured = false;
952
953 r = link_request_set_routing_policy_rule(link);
954 if (r < 0)
955 return r;
956
957 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
958 for (phase = 0; phase < _PHASE_MAX; phase++)
959 LIST_FOREACH(routes, rt, link->network->static_routes) {
960
961 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
962 continue;
963
964 r = route_configure(rt, link, route_handler);
965 if (r < 0) {
966 log_link_warning_errno(link, r, "Could not set routes: %m");
967 link_enter_failed(link);
968 return r;
969 }
970
971 link->route_messages++;
972 }
973
974 if (link->route_messages == 0) {
975 link->static_routes_configured = true;
976 link_check_ready(link);
977 } else
978 log_link_debug(link, "Setting routes");
979
980 return 0;
981 }
982
983 void link_check_ready(Link *link) {
984 Address *a;
985 Iterator i;
986
987 assert(link);
988
989 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
990 return;
991
992 if (!link->network)
993 return;
994
995 if (!link->addresses_configured)
996 return;
997
998 if (!link->neighbors_configured)
999 return;
1000
1001 SET_FOREACH(a, link->addresses, i)
1002 if (!address_is_ready(a))
1003 return;
1004
1005 if (!link->addresses_ready) {
1006 link->addresses_ready = true;
1007 link_request_set_routes(link);
1008 }
1009
1010 if (!link->static_routes_configured)
1011 return;
1012
1013 if (!link->routing_policy_rules_configured)
1014 return;
1015
1016 if (link_ipv4ll_enabled(link))
1017 if (!link->ipv4ll_address ||
1018 !link->ipv4ll_route)
1019 return;
1020
1021 if (link_ipv6ll_enabled(link) &&
1022 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
1023 return;
1024
1025 if ((link_dhcp4_enabled(link) && !link_dhcp6_enabled(link) &&
1026 !link->dhcp4_configured) ||
1027 (link_dhcp6_enabled(link) && !link_dhcp4_enabled(link) &&
1028 !link->dhcp6_configured) ||
1029 (link_dhcp4_enabled(link) && link_dhcp6_enabled(link) &&
1030 !link->dhcp4_configured && !link->dhcp6_configured))
1031 return;
1032
1033 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
1034 return;
1035
1036 if (link->state != LINK_STATE_CONFIGURED)
1037 link_enter_configured(link);
1038
1039 return;
1040 }
1041
1042 static int link_request_set_neighbors(Link *link) {
1043 Neighbor *neighbor;
1044 int r;
1045
1046 assert(link);
1047 assert(link->network);
1048 assert(link->state != _LINK_STATE_INVALID);
1049
1050 link_set_state(link, LINK_STATE_CONFIGURING);
1051 link->neighbors_configured = false;
1052
1053 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1054 r = neighbor_configure(neighbor, link, NULL);
1055 if (r < 0) {
1056 log_link_warning_errno(link, r, "Could not set neighbor: %m");
1057 link_enter_failed(link);
1058 return r;
1059 }
1060 }
1061
1062 if (link->neighbor_messages == 0) {
1063 link->neighbors_configured = true;
1064 link_check_ready(link);
1065 } else
1066 log_link_debug(link, "Setting neighbors");
1067
1068 return 0;
1069 }
1070
1071 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1072 int r;
1073
1074 assert(rtnl);
1075 assert(m);
1076 assert(link);
1077 assert(link->ifname);
1078 assert(link->address_messages > 0);
1079 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1080 LINK_STATE_FAILED, LINK_STATE_LINGER));
1081
1082 link->address_messages--;
1083
1084 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1085 return 1;
1086
1087 r = sd_netlink_message_get_errno(m);
1088 if (r < 0 && r != -EEXIST)
1089 log_link_warning_errno(link, r, "could not set address: %m");
1090 else if (r >= 0)
1091 manager_rtnl_process_address(rtnl, m, link->manager);
1092
1093 if (link->address_messages == 0) {
1094 log_link_debug(link, "Addresses set");
1095 link->addresses_configured = true;
1096 link_check_ready(link);
1097 }
1098
1099 return 1;
1100 }
1101
1102 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1103 _cleanup_free_ struct in_addr *addresses = NULL;
1104 size_t n_addresses = 0, n_allocated = 0;
1105 unsigned i;
1106
1107 log_debug("Copying DNS server information from %s", link->ifname);
1108
1109 if (!link->network)
1110 return 0;
1111
1112 for (i = 0; i < link->network->n_dns; i++) {
1113 struct in_addr ia;
1114
1115 /* Only look for IPv4 addresses */
1116 if (link->network->dns[i].family != AF_INET)
1117 continue;
1118
1119 ia = link->network->dns[i].address.in;
1120
1121 /* Never propagate obviously borked data */
1122 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1123 continue;
1124
1125 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1126 return log_oom();
1127
1128 addresses[n_addresses++] = ia;
1129 }
1130
1131 if (link->network->dhcp_use_dns && link->dhcp_lease) {
1132 const struct in_addr *da = NULL;
1133 int j, n;
1134
1135 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
1136 if (n > 0) {
1137
1138 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1139 return log_oom();
1140
1141 for (j = 0; j < n; j++)
1142 if (in4_addr_is_non_local(&da[j]))
1143 addresses[n_addresses++] = da[j];
1144 }
1145 }
1146
1147 if (n_addresses <= 0)
1148 return 0;
1149
1150 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
1151 }
1152
1153 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1154 _cleanup_free_ struct in_addr *addresses = NULL;
1155 size_t n_addresses = 0, n_allocated = 0;
1156 char **a;
1157
1158 if (!link->network)
1159 return 0;
1160
1161 log_debug("Copying NTP server information from %s", link->ifname);
1162
1163 STRV_FOREACH(a, link->network->ntp) {
1164 struct in_addr ia;
1165
1166 /* Only look for IPv4 addresses */
1167 if (inet_pton(AF_INET, *a, &ia) <= 0)
1168 continue;
1169
1170 /* Never propagate obviously borked data */
1171 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1172 continue;
1173
1174 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1175 return log_oom();
1176
1177 addresses[n_addresses++] = ia;
1178 }
1179
1180 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1181 const struct in_addr *da = NULL;
1182 int j, n;
1183
1184 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1185 if (n > 0) {
1186
1187 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1188 return log_oom();
1189
1190 for (j = 0; j < n; j++)
1191 if (in4_addr_is_non_local(&da[j]))
1192 addresses[n_addresses++] = da[j];
1193 }
1194 }
1195
1196 if (n_addresses <= 0)
1197 return 0;
1198
1199 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1200 }
1201
1202 static int link_set_bridge_fdb(Link *link) {
1203 FdbEntry *fdb_entry;
1204 int r;
1205
1206 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1207 r = fdb_entry_configure(link, fdb_entry);
1208 if (r < 0)
1209 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1210 }
1211
1212 return 0;
1213 }
1214
1215 static int link_request_set_addresses(Link *link) {
1216 AddressLabel *label;
1217 Address *ad;
1218 int r;
1219
1220 assert(link);
1221 assert(link->network);
1222 assert(link->state != _LINK_STATE_INVALID);
1223
1224 link_set_state(link, LINK_STATE_CONFIGURING);
1225
1226 /* Reset all *_configured flags we are configuring. */
1227 link->addresses_configured = false;
1228 link->addresses_ready = false;
1229 link->neighbors_configured = false;
1230 link->static_routes_configured = false;
1231 link->routing_policy_rules_configured = false;
1232
1233 r = link_set_bridge_fdb(link);
1234 if (r < 0)
1235 return r;
1236
1237 r = link_request_set_neighbors(link);
1238 if (r < 0)
1239 return r;
1240
1241 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1242 bool update;
1243
1244 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1245
1246 r = address_configure(ad, link, address_handler, update);
1247 if (r < 0) {
1248 log_link_warning_errno(link, r, "Could not set addresses: %m");
1249 link_enter_failed(link);
1250 return r;
1251 }
1252
1253 link->address_messages++;
1254 }
1255
1256 LIST_FOREACH(labels, label, link->network->address_labels) {
1257 r = address_label_configure(label, link, NULL, false);
1258 if (r < 0) {
1259 log_link_warning_errno(link, r, "Could not set address label: %m");
1260 link_enter_failed(link);
1261 return r;
1262 }
1263
1264 link->address_label_messages++;
1265 }
1266
1267 /* now that we can figure out a default address for the dhcp server,
1268 start it */
1269 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1270 Address *address;
1271 Link *uplink = NULL;
1272 bool acquired_uplink = false;
1273
1274 address = link_find_dhcp_server_address(link);
1275 if (!address) {
1276 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1277 link_enter_failed(link);
1278 return 0;
1279 }
1280
1281 /* use the server address' subnet as the pool */
1282 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1283 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1284 if (r < 0)
1285 return r;
1286
1287 /* TODO:
1288 r = sd_dhcp_server_set_router(link->dhcp_server,
1289 &main_address->in_addr.in);
1290 if (r < 0)
1291 return r;
1292 */
1293
1294 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1295 r = sd_dhcp_server_set_max_lease_time(
1296 link->dhcp_server,
1297 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1298 if (r < 0)
1299 return r;
1300 }
1301
1302 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1303 r = sd_dhcp_server_set_default_lease_time(
1304 link->dhcp_server,
1305 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1306 if (r < 0)
1307 return r;
1308 }
1309
1310 if (link->network->dhcp_server_emit_dns) {
1311
1312 if (link->network->n_dhcp_server_dns > 0)
1313 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1314 else {
1315 uplink = manager_find_uplink(link->manager, link);
1316 acquired_uplink = true;
1317
1318 if (!uplink) {
1319 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1320 r = 0;
1321 } else
1322 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1323 }
1324 if (r < 0)
1325 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1326 }
1327
1328 if (link->network->dhcp_server_emit_ntp) {
1329
1330 if (link->network->n_dhcp_server_ntp > 0)
1331 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1332 else {
1333 if (!acquired_uplink)
1334 uplink = manager_find_uplink(link->manager, link);
1335
1336 if (!uplink) {
1337 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1338 r = 0;
1339 } else
1340 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1341
1342 }
1343 if (r < 0)
1344 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1345 }
1346
1347 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1348 if (r < 0)
1349 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1350
1351 if (link->network->dhcp_server_emit_timezone) {
1352 _cleanup_free_ char *buffer = NULL;
1353 const char *tz = NULL;
1354
1355 if (link->network->dhcp_server_timezone)
1356 tz = link->network->dhcp_server_timezone;
1357 else {
1358 r = get_timezone(&buffer);
1359 if (r < 0)
1360 log_warning_errno(r, "Failed to determine timezone: %m");
1361 else
1362 tz = buffer;
1363 }
1364
1365 if (tz) {
1366 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1367 if (r < 0)
1368 return r;
1369 }
1370 }
1371 if (!sd_dhcp_server_is_running(link->dhcp_server)) {
1372 r = sd_dhcp_server_start(link->dhcp_server);
1373 if (r < 0) {
1374 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1375
1376 link_enter_failed(link);
1377
1378 return 0;
1379 }
1380 }
1381
1382 log_link_debug(link, "Offering DHCPv4 leases");
1383 }
1384
1385 if (link->address_messages == 0) {
1386 link->addresses_configured = true;
1387 link_check_ready(link);
1388 } else
1389 log_link_debug(link, "Setting addresses");
1390
1391 return 0;
1392 }
1393
1394 static int link_set_bridge_vlan(Link *link) {
1395 int r = 0;
1396
1397 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1398 if (r < 0)
1399 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1400
1401 return r;
1402 }
1403
1404 static int link_set_proxy_arp(Link *link) {
1405 int r;
1406
1407 if (!link_proxy_arp_enabled(link))
1408 return 0;
1409
1410 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1411 if (r < 0)
1412 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1413
1414 return 0;
1415 }
1416
1417 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1418 int r;
1419
1420 assert(link);
1421
1422 log_link_debug(link, "Set link");
1423
1424 r = sd_netlink_message_get_errno(m);
1425 if (r < 0 && r != -EEXIST) {
1426 log_link_error_errno(link, r, "Could not join netdev: %m");
1427 link_enter_failed(link);
1428 }
1429
1430 return 1;
1431 }
1432
1433 static int link_configure_after_setting_mtu(Link *link);
1434
1435 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1436 int r;
1437
1438 assert(m);
1439 assert(link);
1440 assert(link->ifname);
1441
1442 link->setting_mtu = false;
1443
1444 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1445 return 1;
1446
1447 r = sd_netlink_message_get_errno(m);
1448 if (r < 0) {
1449 log_link_warning_errno(link, r, "Could not set MTU: %m");
1450 return 1;
1451 }
1452
1453 log_link_debug(link, "Setting MTU done.");
1454
1455 if (link->state == LINK_STATE_PENDING)
1456 (void) link_configure_after_setting_mtu(link);
1457
1458 return 1;
1459 }
1460
1461 int link_set_mtu(Link *link, uint32_t mtu, bool force) {
1462 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1463 int r;
1464
1465 assert(link);
1466 assert(link->manager);
1467 assert(link->manager->rtnl);
1468
1469 if (mtu == 0 || link->setting_mtu)
1470 return 0;
1471
1472 if (force ? link->mtu == mtu : link->mtu >= mtu)
1473 return 0;
1474
1475 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1476
1477 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1478 if (r < 0)
1479 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1480
1481 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1482 * for this interface, then disable IPv6 else enable it. */
1483 (void) link_enable_ipv6(link);
1484
1485 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1486 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1487 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1488
1489 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1490 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1491
1492 mtu = IPV6_MIN_MTU;
1493 }
1494
1495 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1496 if (r < 0)
1497 return log_link_error_errno(link, r, "Could not append MTU: %m");
1498
1499 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1500 link_netlink_destroy_callback, link);
1501 if (r < 0)
1502 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1503
1504 link_ref(link);
1505 link->setting_mtu = true;
1506
1507 return 0;
1508 }
1509
1510 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1511 int r;
1512
1513 assert(m);
1514 assert(link);
1515 assert(link->ifname);
1516
1517 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1518 return 1;
1519
1520 r = sd_netlink_message_get_errno(m);
1521 if (r < 0)
1522 log_link_warning_errno(link, r, "Could not set link flags: %m");
1523
1524 return 1;
1525 }
1526
1527 static int link_set_flags(Link *link) {
1528 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1529 unsigned ifi_change = 0;
1530 unsigned ifi_flags = 0;
1531 int r;
1532
1533 assert(link);
1534 assert(link->manager);
1535 assert(link->manager->rtnl);
1536
1537 if (link->flags & IFF_LOOPBACK)
1538 return 0;
1539
1540 if (!link->network)
1541 return 0;
1542
1543 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1544 return 0;
1545
1546 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1547 if (r < 0)
1548 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1549
1550 if (link->network->arp >= 0) {
1551 ifi_change |= IFF_NOARP;
1552 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1553 }
1554
1555 if (link->network->multicast >= 0) {
1556 ifi_change |= IFF_MULTICAST;
1557 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1558 }
1559
1560 if (link->network->allmulticast >= 0) {
1561 ifi_change |= IFF_ALLMULTI;
1562 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1563 }
1564
1565 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1566 if (r < 0)
1567 return log_link_error_errno(link, r, "Could not set link flags: %m");
1568
1569 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1570 link_netlink_destroy_callback, link);
1571 if (r < 0)
1572 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1573
1574 link_ref(link);
1575
1576 return 0;
1577 }
1578
1579 static int link_set_bridge(Link *link) {
1580 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1581 int r;
1582
1583 assert(link);
1584 assert(link->network);
1585
1586 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1587 if (r < 0)
1588 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1589
1590 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1591 if (r < 0)
1592 return log_link_error_errno(link, r, "Could not set message family: %m");
1593
1594 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1595 if (r < 0)
1596 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1597
1598 if (link->network->use_bpdu >= 0) {
1599 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
1600 if (r < 0)
1601 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1602 }
1603
1604 if (link->network->hairpin >= 0) {
1605 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1606 if (r < 0)
1607 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1608 }
1609
1610 if (link->network->fast_leave >= 0) {
1611 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1612 if (r < 0)
1613 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1614 }
1615
1616 if (link->network->allow_port_to_be_root >= 0) {
1617 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
1618 if (r < 0)
1619 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1620
1621 }
1622
1623 if (link->network->unicast_flood >= 0) {
1624 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1625 if (r < 0)
1626 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1627 }
1628
1629 if (link->network->multicast_flood >= 0) {
1630 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_FLOOD, link->network->multicast_flood);
1631 if (r < 0)
1632 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_FLOOD attribute: %m");
1633 }
1634
1635 if (link->network->multicast_to_unicast >= 0) {
1636 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_TO_UCAST, link->network->multicast_to_unicast);
1637 if (r < 0)
1638 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_TO_UCAST attribute: %m");
1639 }
1640
1641 if (link->network->neighbor_suppression >= 0) {
1642 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_NEIGH_SUPPRESS, link->network->neighbor_suppression);
1643 if (r < 0)
1644 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_NEIGH_SUPPRESS attribute: %m");
1645 }
1646
1647 if (link->network->learning >= 0) {
1648 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_LEARNING, link->network->learning);
1649 if (r < 0)
1650 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_LEARNING attribute: %m");
1651 }
1652
1653 if (link->network->cost != 0) {
1654 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1655 if (r < 0)
1656 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1657 }
1658
1659 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1660 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1661 if (r < 0)
1662 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1663 }
1664
1665 r = sd_netlink_message_close_container(req);
1666 if (r < 0)
1667 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1668
1669 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_handler,
1670 link_netlink_destroy_callback, link);
1671 if (r < 0)
1672 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1673
1674 link_ref(link);
1675
1676 return r;
1677 }
1678
1679 static int link_set_bond_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1680 int r;
1681
1682 assert(m);
1683 assert(link);
1684 assert(link->ifname);
1685
1686 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1687 return 1;
1688
1689 r = sd_netlink_message_get_errno(m);
1690 if (r < 0) {
1691 log_link_warning_errno(link, r, "Could not set bonding interface: %m");
1692 return 1;
1693 }
1694
1695 return 1;
1696 }
1697
1698 static int link_set_bond(Link *link) {
1699 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1700 int r;
1701
1702 assert(link);
1703 assert(link->network);
1704
1705 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1706 if (r < 0)
1707 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1708
1709 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1710 if (r < 0)
1711 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1712
1713 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1714 if (r < 0)
1715 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1716
1717 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1718 if (r < 0)
1719 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1720
1721 if (link->network->active_slave) {
1722 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1723 if (r < 0)
1724 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1725 }
1726
1727 if (link->network->primary_slave) {
1728 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1729 if (r < 0)
1730 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1731 }
1732
1733 r = sd_netlink_message_close_container(req);
1734 if (r < 0)
1735 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1736
1737 r = sd_netlink_message_close_container(req);
1738 if (r < 0)
1739 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1740
1741 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_bond_handler,
1742 link_netlink_destroy_callback, link);
1743 if (r < 0)
1744 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1745
1746 link_ref(link);
1747
1748 return r;
1749 }
1750
1751 static int link_append_to_master(Link *link, NetDev *netdev) {
1752 Link *master;
1753 int r;
1754
1755 assert(link);
1756 assert(netdev);
1757
1758 r = link_get(link->manager, netdev->ifindex, &master);
1759 if (r < 0)
1760 return r;
1761
1762 r = hashmap_ensure_allocated(&master->slaves, NULL);
1763 if (r < 0)
1764 return r;
1765
1766 r = hashmap_put(master->slaves, INT_TO_PTR(link->ifindex), link);
1767 if (r < 0)
1768 return r;
1769
1770 return 0;
1771 }
1772
1773 static int link_lldp_save(Link *link) {
1774 _cleanup_free_ char *temp_path = NULL;
1775 _cleanup_fclose_ FILE *f = NULL;
1776 sd_lldp_neighbor **l = NULL;
1777 int n = 0, r, i;
1778
1779 assert(link);
1780 assert(link->lldp_file);
1781
1782 if (!link->lldp) {
1783 (void) unlink(link->lldp_file);
1784 return 0;
1785 }
1786
1787 r = sd_lldp_get_neighbors(link->lldp, &l);
1788 if (r < 0)
1789 goto finish;
1790 if (r == 0) {
1791 (void) unlink(link->lldp_file);
1792 goto finish;
1793 }
1794
1795 n = r;
1796
1797 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1798 if (r < 0)
1799 goto finish;
1800
1801 fchmod(fileno(f), 0644);
1802
1803 for (i = 0; i < n; i++) {
1804 const void *p;
1805 le64_t u;
1806 size_t sz;
1807
1808 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1809 if (r < 0)
1810 goto finish;
1811
1812 u = htole64(sz);
1813 (void) fwrite(&u, 1, sizeof(u), f);
1814 (void) fwrite(p, 1, sz, f);
1815 }
1816
1817 r = fflush_and_check(f);
1818 if (r < 0)
1819 goto finish;
1820
1821 if (rename(temp_path, link->lldp_file) < 0) {
1822 r = -errno;
1823 goto finish;
1824 }
1825
1826 finish:
1827 if (r < 0) {
1828 (void) unlink(link->lldp_file);
1829 if (temp_path)
1830 (void) unlink(temp_path);
1831
1832 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1833 }
1834
1835 if (l) {
1836 for (i = 0; i < n; i++)
1837 sd_lldp_neighbor_unref(l[i]);
1838 free(l);
1839 }
1840
1841 return r;
1842 }
1843
1844 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1845 Link *link = userdata;
1846 int r;
1847
1848 assert(link);
1849
1850 (void) link_lldp_save(link);
1851
1852 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1853 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1854
1855 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1856
1857 r = link_lldp_emit_start(link);
1858 if (r < 0)
1859 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1860 }
1861 }
1862
1863 static int link_acquire_ipv6_conf(Link *link) {
1864 int r;
1865
1866 assert(link);
1867
1868 if (link_ipv6_accept_ra_enabled(link)) {
1869 assert(link->ndisc);
1870
1871 log_link_debug(link, "Discovering IPv6 routers");
1872
1873 r = sd_ndisc_start(link->ndisc);
1874 if (r < 0 && r != -EBUSY)
1875 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1876 }
1877
1878 if (link_radv_enabled(link)) {
1879 assert(link->radv);
1880 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1881
1882 log_link_debug(link, "Starting IPv6 Router Advertisements");
1883
1884 r = sd_radv_start(link->radv);
1885 if (r < 0 && r != -EBUSY)
1886 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1887 }
1888
1889 (void) dhcp6_request_prefix_delegation(link);
1890
1891 return 0;
1892 }
1893
1894 static int link_acquire_ipv4_conf(Link *link) {
1895 int r;
1896
1897 assert(link);
1898 assert(link->network);
1899 assert(link->manager);
1900 assert(link->manager->event);
1901
1902 if (link_ipv4ll_enabled(link)) {
1903 assert(link->ipv4ll);
1904
1905 log_link_debug(link, "Acquiring IPv4 link-local address");
1906
1907 r = sd_ipv4ll_start(link->ipv4ll);
1908 if (r < 0)
1909 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1910 }
1911
1912 if (link_dhcp4_enabled(link)) {
1913 assert(link->dhcp_client);
1914
1915 log_link_debug(link, "Acquiring DHCPv4 lease");
1916
1917 r = sd_dhcp_client_start(link->dhcp_client);
1918 if (r < 0)
1919 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1920 }
1921
1922 return 0;
1923 }
1924
1925 static int link_acquire_conf(Link *link) {
1926 int r;
1927
1928 assert(link);
1929
1930 r = link_acquire_ipv4_conf(link);
1931 if (r < 0)
1932 return r;
1933
1934 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1935 r = link_acquire_ipv6_conf(link);
1936 if (r < 0)
1937 return r;
1938 }
1939
1940 if (link_lldp_emit_enabled(link)) {
1941 r = link_lldp_emit_start(link);
1942 if (r < 0)
1943 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1944 }
1945
1946 return 0;
1947 }
1948
1949 bool link_has_carrier(Link *link) {
1950 /* see Documentation/networking/operstates.txt in the kernel sources */
1951
1952 if (link->kernel_operstate == IF_OPER_UP)
1953 return true;
1954
1955 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1956 /* operstate may not be implemented, so fall back to flags */
1957 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1958 return true;
1959
1960 return false;
1961 }
1962
1963 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1964 int r;
1965
1966 assert(link);
1967
1968 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1969 return 1;
1970
1971 r = sd_netlink_message_get_errno(m);
1972 if (r < 0)
1973 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1974
1975 return 1;
1976 }
1977
1978 static int link_configure_addrgen_mode(Link *link) {
1979 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1980 uint8_t ipv6ll_mode;
1981 int r;
1982
1983 assert(link);
1984 assert(link->network);
1985 assert(link->manager);
1986 assert(link->manager->rtnl);
1987
1988 log_link_debug(link, "Setting address genmode for link");
1989
1990 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1991 if (r < 0)
1992 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1993
1994 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1995 if (r < 0)
1996 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1997
1998 r = sd_netlink_message_open_container(req, AF_INET6);
1999 if (r < 0)
2000 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
2001
2002 if (!link_ipv6ll_enabled(link))
2003 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
2004 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
2005 /* The file may not exist. And event if it exists, when stable_secret is unset,
2006 * reading the file fails with EIO. */
2007 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
2008 else
2009 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
2010
2011 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
2012 if (r < 0)
2013 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
2014
2015 r = sd_netlink_message_close_container(req);
2016 if (r < 0)
2017 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
2018
2019 r = sd_netlink_message_close_container(req);
2020 if (r < 0)
2021 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
2022
2023 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
2024 link_netlink_destroy_callback, link);
2025 if (r < 0)
2026 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2027
2028 link_ref(link);
2029
2030 return 0;
2031 }
2032
2033 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2034 int r;
2035
2036 assert(link);
2037
2038 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2039 return 1;
2040
2041 r = sd_netlink_message_get_errno(m);
2042 if (r < 0)
2043 /* we warn but don't fail the link, as it may be brought up later */
2044 log_link_warning_errno(link, r, "Could not bring up interface: %m");
2045
2046 return 1;
2047 }
2048
2049 static int link_up(Link *link) {
2050 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2051 int r;
2052
2053 assert(link);
2054 assert(link->network);
2055 assert(link->manager);
2056 assert(link->manager->rtnl);
2057
2058 log_link_debug(link, "Bringing link up");
2059
2060 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2061 if (r < 0)
2062 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2063
2064 /* set it free if not enslaved with networkd */
2065 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
2066 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
2067 if (r < 0)
2068 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
2069 }
2070
2071 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
2072 if (r < 0)
2073 return log_link_error_errno(link, r, "Could not set link flags: %m");
2074
2075 if (link->network->mac) {
2076 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
2077 if (r < 0)
2078 return log_link_error_errno(link, r, "Could not set MAC address: %m");
2079 }
2080
2081 if (link_ipv6_enabled(link)) {
2082 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
2083 if (r < 0)
2084 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
2085
2086 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
2087 r = sd_netlink_message_open_container(req, AF_INET6);
2088 if (r < 0)
2089 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
2090
2091 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
2092 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
2093 if (r < 0)
2094 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
2095 }
2096
2097 r = sd_netlink_message_close_container(req);
2098 if (r < 0)
2099 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
2100
2101 r = sd_netlink_message_close_container(req);
2102 if (r < 0)
2103 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
2104 }
2105
2106 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2107 link_netlink_destroy_callback, link);
2108 if (r < 0)
2109 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2110
2111 link_ref(link);
2112
2113 return 0;
2114 }
2115
2116 static int link_up_can(Link *link) {
2117 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2118 int r;
2119
2120 assert(link);
2121
2122 log_link_debug(link, "Bringing CAN link up");
2123
2124 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2125 if (r < 0)
2126 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2127
2128 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
2129 if (r < 0)
2130 return log_link_error_errno(link, r, "Could not set link flags: %m");
2131
2132 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2133 link_netlink_destroy_callback, link);
2134 if (r < 0)
2135 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2136
2137 link_ref(link);
2138
2139 return 0;
2140 }
2141
2142 static int link_set_can(Link *link) {
2143 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
2144 int r;
2145
2146 assert(link);
2147 assert(link->network);
2148 assert(link->manager);
2149 assert(link->manager->rtnl);
2150
2151 log_link_debug(link, "link_set_can");
2152
2153 r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
2154 if (r < 0)
2155 return log_link_error_errno(link, r, "Failed to allocate netlink message: %m");
2156
2157 r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
2158 if (r < 0)
2159 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
2160
2161 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
2162 if (r < 0)
2163 return log_link_error_errno(link, r, "Failed to open netlink container: %m");
2164
2165 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
2166 if (r < 0)
2167 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
2168
2169 if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) {
2170 struct can_bittiming bt = {
2171 .bitrate = link->network->can_bitrate,
2172 .sample_point = link->network->can_sample_point,
2173 };
2174
2175 if (link->network->can_bitrate > UINT32_MAX) {
2176 log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate);
2177 return -ERANGE;
2178 }
2179
2180 log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate);
2181 if (link->network->can_sample_point > 0)
2182 log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
2183 else
2184 log_link_debug(link, "Using default sample point");
2185
2186 r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
2187 if (r < 0)
2188 return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
2189 }
2190
2191 if (link->network->can_restart_us > 0) {
2192 char time_string[FORMAT_TIMESPAN_MAX];
2193 uint64_t restart_ms;
2194
2195 if (link->network->can_restart_us == USEC_INFINITY)
2196 restart_ms = 0;
2197 else
2198 restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC);
2199
2200 format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC);
2201
2202 if (restart_ms > UINT32_MAX) {
2203 log_link_error(link, "restart timeout (%s) too big.", time_string);
2204 return -ERANGE;
2205 }
2206
2207 log_link_debug(link, "Setting restart = %s", time_string);
2208
2209 r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
2210 if (r < 0)
2211 return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
2212 }
2213
2214 if (link->network->can_triple_sampling >= 0) {
2215 struct can_ctrlmode cm = {
2216 .mask = CAN_CTRLMODE_3_SAMPLES,
2217 .flags = link->network->can_triple_sampling ? CAN_CTRLMODE_3_SAMPLES : 0,
2218 };
2219
2220 log_link_debug(link, "%sabling triple-sampling", link->network->can_triple_sampling ? "En" : "Dis");
2221
2222 r = sd_netlink_message_append_data(m, IFLA_CAN_CTRLMODE, &cm, sizeof(cm));
2223 if (r < 0)
2224 return log_link_error_errno(link, r, "Could not append IFLA_CAN_CTRLMODE attribute: %m");
2225 }
2226
2227 r = sd_netlink_message_close_container(m);
2228 if (r < 0)
2229 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2230
2231 r = sd_netlink_message_close_container(m);
2232 if (r < 0)
2233 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2234
2235 r = netlink_call_async(link->manager->rtnl, NULL, m, link_set_handler,
2236 link_netlink_destroy_callback, link);
2237 if (r < 0)
2238 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2239
2240 link_ref(link);
2241
2242 if (!(link->flags & IFF_UP)) {
2243 r = link_up_can(link);
2244 if (r < 0) {
2245 link_enter_failed(link);
2246 return r;
2247 }
2248 }
2249
2250 log_link_debug(link, "link_set_can done");
2251
2252 return r;
2253 }
2254
2255 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2256 int r;
2257
2258 assert(link);
2259
2260 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2261 return 1;
2262
2263 r = sd_netlink_message_get_errno(m);
2264 if (r < 0)
2265 log_link_warning_errno(link, r, "Could not bring down interface: %m");
2266
2267 if (streq_ptr(link->kind, "can"))
2268 link_set_can(link);
2269
2270 return 1;
2271 }
2272
2273 int link_down(Link *link) {
2274 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2275 int r;
2276
2277 assert(link);
2278 assert(link->manager);
2279 assert(link->manager->rtnl);
2280
2281 log_link_debug(link, "Bringing link down");
2282
2283 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
2284 RTM_SETLINK, link->ifindex);
2285 if (r < 0)
2286 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2287
2288 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
2289 if (r < 0)
2290 return log_link_error_errno(link, r, "Could not set link flags: %m");
2291
2292 r = netlink_call_async(link->manager->rtnl, NULL, req, link_down_handler,
2293 link_netlink_destroy_callback, link);
2294 if (r < 0)
2295 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2296
2297 link_ref(link);
2298
2299 return 0;
2300 }
2301
2302 static int link_handle_bound_to_list(Link *link) {
2303 Link *l;
2304 Iterator i;
2305 int r;
2306 bool required_up = false;
2307 bool link_is_up = false;
2308
2309 assert(link);
2310
2311 if (hashmap_isempty(link->bound_to_links))
2312 return 0;
2313
2314 if (link->flags & IFF_UP)
2315 link_is_up = true;
2316
2317 HASHMAP_FOREACH (l, link->bound_to_links, i)
2318 if (link_has_carrier(l)) {
2319 required_up = true;
2320 break;
2321 }
2322
2323 if (!required_up && link_is_up) {
2324 r = link_down(link);
2325 if (r < 0)
2326 return r;
2327 } else if (required_up && !link_is_up) {
2328 r = link_up(link);
2329 if (r < 0)
2330 return r;
2331 }
2332
2333 return 0;
2334 }
2335
2336 static int link_handle_bound_by_list(Link *link) {
2337 Iterator i;
2338 Link *l;
2339 int r;
2340
2341 assert(link);
2342
2343 if (hashmap_isempty(link->bound_by_links))
2344 return 0;
2345
2346 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2347 r = link_handle_bound_to_list(l);
2348 if (r < 0)
2349 return r;
2350 }
2351
2352 return 0;
2353 }
2354
2355 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2356 int r;
2357
2358 assert(link);
2359 assert(carrier);
2360
2361 if (link == carrier)
2362 return 0;
2363
2364 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2365 return 0;
2366
2367 r = hashmap_ensure_allocated(h, NULL);
2368 if (r < 0)
2369 return r;
2370
2371 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2372 if (r < 0)
2373 return r;
2374
2375 return 0;
2376 }
2377
2378 static int link_new_bound_by_list(Link *link) {
2379 Manager *m;
2380 Link *carrier;
2381 Iterator i;
2382 int r;
2383 bool list_updated = false;
2384
2385 assert(link);
2386 assert(link->manager);
2387
2388 m = link->manager;
2389
2390 HASHMAP_FOREACH(carrier, m->links, i) {
2391 if (!carrier->network)
2392 continue;
2393
2394 if (strv_isempty(carrier->network->bind_carrier))
2395 continue;
2396
2397 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2398 r = link_put_carrier(link, carrier, &link->bound_by_links);
2399 if (r < 0)
2400 return r;
2401
2402 list_updated = true;
2403 }
2404 }
2405
2406 if (list_updated)
2407 link_dirty(link);
2408
2409 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2410 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2411 if (r < 0)
2412 return r;
2413
2414 link_dirty(carrier);
2415 }
2416
2417 return 0;
2418 }
2419
2420 static int link_new_bound_to_list(Link *link) {
2421 Manager *m;
2422 Link *carrier;
2423 Iterator i;
2424 int r;
2425 bool list_updated = false;
2426
2427 assert(link);
2428 assert(link->manager);
2429
2430 if (!link->network)
2431 return 0;
2432
2433 if (strv_isempty(link->network->bind_carrier))
2434 return 0;
2435
2436 m = link->manager;
2437
2438 HASHMAP_FOREACH (carrier, m->links, i) {
2439 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2440 r = link_put_carrier(link, carrier, &link->bound_to_links);
2441 if (r < 0)
2442 return r;
2443
2444 list_updated = true;
2445 }
2446 }
2447
2448 if (list_updated)
2449 link_dirty(link);
2450
2451 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2452 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2453 if (r < 0)
2454 return r;
2455
2456 link_dirty(carrier);
2457 }
2458
2459 return 0;
2460 }
2461
2462 static int link_new_carrier_maps(Link *link) {
2463 int r;
2464
2465 r = link_new_bound_by_list(link);
2466 if (r < 0)
2467 return r;
2468
2469 r = link_handle_bound_by_list(link);
2470 if (r < 0)
2471 return r;
2472
2473 r = link_new_bound_to_list(link);
2474 if (r < 0)
2475 return r;
2476
2477 r = link_handle_bound_to_list(link);
2478 if (r < 0)
2479 return r;
2480
2481 return 0;
2482 }
2483
2484 static void link_free_bound_to_list(Link *link) {
2485 Link *bound_to;
2486 Iterator i;
2487
2488 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2489 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2490
2491 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2492 link_dirty(bound_to);
2493 }
2494
2495 return;
2496 }
2497
2498 static void link_free_bound_by_list(Link *link) {
2499 Link *bound_by;
2500 Iterator i;
2501
2502 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2503 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2504
2505 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2506 link_dirty(bound_by);
2507 link_handle_bound_to_list(bound_by);
2508 }
2509 }
2510
2511 return;
2512 }
2513
2514 static void link_free_carrier_maps(Link *link) {
2515 bool list_updated = false;
2516
2517 assert(link);
2518
2519 if (!hashmap_isempty(link->bound_to_links)) {
2520 link_free_bound_to_list(link);
2521 list_updated = true;
2522 }
2523
2524 if (!hashmap_isempty(link->bound_by_links)) {
2525 link_free_bound_by_list(link);
2526 list_updated = true;
2527 }
2528
2529 if (list_updated)
2530 link_dirty(link);
2531
2532 return;
2533 }
2534
2535 void link_drop(Link *link) {
2536 if (!link || link->state == LINK_STATE_LINGER)
2537 return;
2538
2539 link_set_state(link, LINK_STATE_LINGER);
2540
2541 link_free_carrier_maps(link);
2542
2543 log_link_debug(link, "Link removed");
2544
2545 (void) unlink(link->state_file);
2546
2547 link_detach_from_manager(link);
2548
2549 link_unref(link);
2550
2551 return;
2552 }
2553
2554 static int link_joined(Link *link) {
2555 int r;
2556
2557 assert(link);
2558 assert(link->network);
2559
2560 if (!hashmap_isempty(link->bound_to_links)) {
2561 r = link_handle_bound_to_list(link);
2562 if (r < 0)
2563 return r;
2564 } else if (!(link->flags & IFF_UP)) {
2565 r = link_up(link);
2566 if (r < 0) {
2567 link_enter_failed(link);
2568 return r;
2569 }
2570 }
2571
2572 if (link->network->bridge) {
2573 r = link_set_bridge(link);
2574 if (r < 0)
2575 log_link_error_errno(link, r, "Could not set bridge message: %m");
2576
2577 r = link_append_to_master(link, link->network->bridge);
2578 if (r < 0)
2579 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2580 }
2581
2582 if (link->network->bond) {
2583 r = link_set_bond(link);
2584 if (r < 0)
2585 log_link_error_errno(link, r, "Could not set bond message: %m");
2586
2587 r = link_append_to_master(link, link->network->bond);
2588 if (r < 0)
2589 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2590 }
2591
2592 if (link->network->use_br_vlan &&
2593 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2594 r = link_set_bridge_vlan(link);
2595 if (r < 0)
2596 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2597 }
2598
2599 /* Skip setting up addresses until it gets carrier,
2600 or it would try to set addresses twice,
2601 which is bad for non-idempotent steps. */
2602 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2603 return 0;
2604
2605 return link_request_set_addresses(link);
2606 }
2607
2608 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2609 int r;
2610
2611 assert(link);
2612 assert(link->network);
2613 assert(link->enslaving > 0);
2614 assert(!link->enslaved_raw);
2615
2616 link->enslaving--;
2617
2618 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2619 return 1;
2620
2621 r = sd_netlink_message_get_errno(m);
2622 if (r < 0 && r != -EEXIST) {
2623 log_link_error_errno(link, r, "Could not join netdev: %m");
2624 link_enter_failed(link);
2625 return 1;
2626 } else
2627 log_link_debug(link, "Joined netdev");
2628
2629 if (link->enslaving == 0) {
2630 link->enslaved_raw = true;
2631 link_joined(link);
2632 }
2633
2634 return 1;
2635 }
2636
2637 static int link_enter_join_netdev(Link *link) {
2638 NetDev *netdev;
2639 Iterator i;
2640 int r;
2641
2642 assert(link);
2643 assert(link->network);
2644 assert(link->state == LINK_STATE_PENDING);
2645
2646 link_set_state(link, LINK_STATE_CONFIGURING);
2647
2648 link_dirty(link);
2649 link->enslaving = 0;
2650 link->enslaved_raw = false;
2651
2652 if (link->network->bond) {
2653 if (link->network->bond->state == NETDEV_STATE_READY &&
2654 link->network->bond->ifindex == link->master_ifindex)
2655 return link_joined(link);
2656
2657 log_struct(LOG_DEBUG,
2658 LOG_LINK_INTERFACE(link),
2659 LOG_NETDEV_INTERFACE(link->network->bond),
2660 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2661
2662 link->enslaving++;
2663
2664 r = netdev_join(link->network->bond, link, netdev_join_handler);
2665 if (r < 0) {
2666 log_struct_errno(LOG_WARNING, r,
2667 LOG_LINK_INTERFACE(link),
2668 LOG_NETDEV_INTERFACE(link->network->bond),
2669 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2670 link_enter_failed(link);
2671 return r;
2672 }
2673 }
2674
2675 if (link->network->bridge) {
2676 log_struct(LOG_DEBUG,
2677 LOG_LINK_INTERFACE(link),
2678 LOG_NETDEV_INTERFACE(link->network->bridge),
2679 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2680
2681 link->enslaving++;
2682
2683 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2684 if (r < 0) {
2685 log_struct_errno(LOG_WARNING, r,
2686 LOG_LINK_INTERFACE(link),
2687 LOG_NETDEV_INTERFACE(link->network->bridge),
2688 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2689 link_enter_failed(link);
2690 return r;
2691 }
2692 }
2693
2694 if (link->network->vrf) {
2695 log_struct(LOG_DEBUG,
2696 LOG_LINK_INTERFACE(link),
2697 LOG_NETDEV_INTERFACE(link->network->vrf),
2698 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2699
2700 link->enslaving++;
2701
2702 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2703 if (r < 0) {
2704 log_struct_errno(LOG_WARNING, r,
2705 LOG_LINK_INTERFACE(link),
2706 LOG_NETDEV_INTERFACE(link->network->vrf),
2707 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2708 link_enter_failed(link);
2709 return r;
2710 }
2711 }
2712
2713 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2714
2715 if (netdev->ifindex > 0)
2716 /* Assume already enslaved. */
2717 continue;
2718
2719 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2720 continue;
2721
2722 log_struct(LOG_DEBUG,
2723 LOG_LINK_INTERFACE(link),
2724 LOG_NETDEV_INTERFACE(netdev),
2725 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2726
2727 link->enslaving++;
2728
2729 r = netdev_join(netdev, link, netdev_join_handler);
2730 if (r < 0) {
2731 log_struct_errno(LOG_WARNING, r,
2732 LOG_LINK_INTERFACE(link),
2733 LOG_NETDEV_INTERFACE(netdev),
2734 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2735 link_enter_failed(link);
2736 return r;
2737 }
2738 }
2739
2740 if (link->enslaving == 0)
2741 return link_joined(link);
2742
2743 return 0;
2744 }
2745
2746 static int link_set_ipv4_forward(Link *link) {
2747 int r;
2748
2749 if (!link_ipv4_forward_enabled(link))
2750 return 0;
2751
2752 /* We propagate the forwarding flag from one interface to the
2753 * global setting one way. This means: as long as at least one
2754 * interface was configured at any time that had IP forwarding
2755 * enabled the setting will stay on for good. We do this
2756 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2757 * somewhat in sync (see below). */
2758
2759 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2760 if (r < 0)
2761 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2762
2763 return 0;
2764 }
2765
2766 static int link_set_ipv6_forward(Link *link) {
2767 int r;
2768
2769 if (!link_ipv6_forward_enabled(link))
2770 return 0;
2771
2772 /* On Linux, the IPv6 stack does not know a per-interface
2773 * packet forwarding setting: either packet forwarding is on
2774 * for all, or off for all. We hence don't bother with a
2775 * per-interface setting, but simply propagate the interface
2776 * flag, if it is set, to the global flag, one-way. Note that
2777 * while IPv4 would allow a per-interface flag, we expose the
2778 * same behaviour there and also propagate the setting from
2779 * one to all, to keep things simple (see above). */
2780
2781 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2782 if (r < 0)
2783 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2784
2785 return 0;
2786 }
2787
2788 static int link_set_ipv6_privacy_extensions(Link *link) {
2789 IPv6PrivacyExtensions s;
2790 int r;
2791
2792 s = link_ipv6_privacy_extensions(link);
2793 if (s < 0)
2794 return 0;
2795
2796 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2797 if (r < 0)
2798 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2799
2800 return 0;
2801 }
2802
2803 static int link_set_ipv6_accept_ra(Link *link) {
2804 int r;
2805
2806 /* Make this a NOP if IPv6 is not available */
2807 if (!socket_ipv6_is_supported())
2808 return 0;
2809
2810 if (link->flags & IFF_LOOPBACK)
2811 return 0;
2812
2813 if (!link->network)
2814 return 0;
2815
2816 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2817 if (r < 0)
2818 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2819
2820 return 0;
2821 }
2822
2823 static int link_set_ipv6_dad_transmits(Link *link) {
2824 int r;
2825
2826 /* Make this a NOP if IPv6 is not available */
2827 if (!socket_ipv6_is_supported())
2828 return 0;
2829
2830 if (link->flags & IFF_LOOPBACK)
2831 return 0;
2832
2833 if (!link->network)
2834 return 0;
2835
2836 if (link->network->ipv6_dad_transmits < 0)
2837 return 0;
2838
2839 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2840 if (r < 0)
2841 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2842
2843 return 0;
2844 }
2845
2846 static int link_set_ipv6_hop_limit(Link *link) {
2847 int r;
2848
2849 /* Make this a NOP if IPv6 is not available */
2850 if (!socket_ipv6_is_supported())
2851 return 0;
2852
2853 if (link->flags & IFF_LOOPBACK)
2854 return 0;
2855
2856 if (!link->network)
2857 return 0;
2858
2859 if (link->network->ipv6_hop_limit < 0)
2860 return 0;
2861
2862 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2863 if (r < 0)
2864 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2865
2866 return 0;
2867 }
2868
2869 static int link_set_ipv6_mtu(Link *link) {
2870 int r;
2871
2872 /* Make this a NOP if IPv6 is not available */
2873 if (!socket_ipv6_is_supported())
2874 return 0;
2875
2876 if (link->flags & IFF_LOOPBACK)
2877 return 0;
2878
2879 if (link->network->ipv6_mtu == 0)
2880 return 0;
2881
2882 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2883 if (r < 0)
2884 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2885
2886 return 0;
2887 }
2888
2889 static bool link_is_static_address_configured(Link *link, Address *address) {
2890 Address *net_address;
2891
2892 assert(link);
2893 assert(address);
2894
2895 if (!link->network)
2896 return false;
2897
2898 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2899 if (address_equal(net_address, address))
2900 return true;
2901
2902 return false;
2903 }
2904
2905 static bool link_is_static_route_configured(Link *link, Route *route) {
2906 Route *net_route;
2907
2908 assert(link);
2909 assert(route);
2910
2911 if (!link->network)
2912 return false;
2913
2914 LIST_FOREACH(routes, net_route, link->network->static_routes)
2915 if (route_equal(net_route, route))
2916 return true;
2917
2918 return false;
2919 }
2920
2921 static int link_drop_foreign_config(Link *link) {
2922 Address *address;
2923 Route *route;
2924 Iterator i;
2925 int r;
2926
2927 SET_FOREACH(address, link->addresses_foreign, i) {
2928 /* we consider IPv6LL addresses to be managed by the kernel */
2929 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2930 continue;
2931
2932 if (link_is_static_address_configured(link, address)) {
2933 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2934 if (r < 0)
2935 return log_link_error_errno(link, r, "Failed to add address: %m");
2936 } else {
2937 r = address_remove(address, link, NULL);
2938 if (r < 0)
2939 return r;
2940 }
2941 }
2942
2943 SET_FOREACH(route, link->routes_foreign, i) {
2944 /* do not touch routes managed by the kernel */
2945 if (route->protocol == RTPROT_KERNEL)
2946 continue;
2947
2948 if (link_is_static_route_configured(link, route)) {
2949 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2950 if (r < 0)
2951 return r;
2952 } else {
2953 r = route_remove(route, link, NULL);
2954 if (r < 0)
2955 return r;
2956 }
2957 }
2958
2959 return 0;
2960 }
2961
2962 static int link_drop_config(Link *link) {
2963 Address *address, *pool_address;
2964 Route *route;
2965 Iterator i;
2966 int r;
2967
2968 SET_FOREACH(address, link->addresses, i) {
2969 /* we consider IPv6LL addresses to be managed by the kernel */
2970 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2971 continue;
2972
2973 r = address_remove(address, link, NULL);
2974 if (r < 0)
2975 return r;
2976
2977 /* If this address came from an address pool, clean up the pool */
2978 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2979 if (address_equal(address, pool_address)) {
2980 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2981 address_free(pool_address);
2982 break;
2983 }
2984 }
2985 }
2986
2987 SET_FOREACH(route, link->routes, i) {
2988 /* do not touch routes managed by the kernel */
2989 if (route->protocol == RTPROT_KERNEL)
2990 continue;
2991
2992 r = route_remove(route, link, NULL);
2993 if (r < 0)
2994 return r;
2995 }
2996
2997 ndisc_flush(link);
2998
2999 return 0;
3000 }
3001
3002 static int link_update_lldp(Link *link) {
3003 int r;
3004
3005 assert(link);
3006
3007 if (!link->lldp)
3008 return 0;
3009
3010 if (link->flags & IFF_UP) {
3011 r = sd_lldp_start(link->lldp);
3012 if (r > 0)
3013 log_link_debug(link, "Started LLDP.");
3014 } else {
3015 r = sd_lldp_stop(link->lldp);
3016 if (r > 0)
3017 log_link_debug(link, "Stopped LLDP.");
3018 }
3019
3020 return r;
3021 }
3022
3023 static int link_configure_can(Link *link) {
3024 int r;
3025
3026 if (streq_ptr(link->kind, "can")) {
3027 /* The CAN interface must be down to configure bitrate, etc... */
3028 if ((link->flags & IFF_UP)) {
3029 r = link_down(link);
3030 if (r < 0) {
3031 link_enter_failed(link);
3032 return r;
3033 }
3034
3035 return 0;
3036 }
3037
3038 return link_set_can(link);
3039 }
3040
3041 if (!(link->flags & IFF_UP)) {
3042 r = link_up_can(link);
3043 if (r < 0) {
3044 link_enter_failed(link);
3045 return r;
3046 }
3047 }
3048
3049 return 0;
3050 }
3051
3052 static int link_configure(Link *link) {
3053 int r;
3054
3055 assert(link);
3056 assert(link->network);
3057 assert(link->state == LINK_STATE_PENDING);
3058
3059 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
3060 return link_configure_can(link);
3061
3062 /* Drop foreign config, but ignore loopback or critical devices.
3063 * We do not want to remove loopback address or addresses used for root NFS. */
3064 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
3065 r = link_drop_foreign_config(link);
3066 if (r < 0)
3067 return r;
3068 }
3069
3070 r = link_set_proxy_arp(link);
3071 if (r < 0)
3072 return r;
3073
3074 r = ipv6_proxy_ndp_addresses_configure(link);
3075 if (r < 0)
3076 return r;
3077
3078 r = link_set_ipv4_forward(link);
3079 if (r < 0)
3080 return r;
3081
3082 r = link_set_ipv6_forward(link);
3083 if (r < 0)
3084 return r;
3085
3086 r = link_set_ipv6_privacy_extensions(link);
3087 if (r < 0)
3088 return r;
3089
3090 r = link_set_ipv6_accept_ra(link);
3091 if (r < 0)
3092 return r;
3093
3094 r = link_set_ipv6_dad_transmits(link);
3095 if (r < 0)
3096 return r;
3097
3098 r = link_set_ipv6_hop_limit(link);
3099 if (r < 0)
3100 return r;
3101
3102 r = link_set_flags(link);
3103 if (r < 0)
3104 return r;
3105
3106 r = link_set_ipv6_mtu(link);
3107 if (r < 0)
3108 return r;
3109
3110 if (link_ipv4ll_enabled(link)) {
3111 r = ipv4ll_configure(link);
3112 if (r < 0)
3113 return r;
3114 }
3115
3116 if (link_dhcp4_enabled(link)) {
3117 r = dhcp4_set_promote_secondaries(link);
3118 if (r < 0)
3119 return r;
3120
3121 r = dhcp4_configure(link);
3122 if (r < 0)
3123 return r;
3124 }
3125
3126 if (link_dhcp4_server_enabled(link)) {
3127 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
3128 if (r < 0)
3129 return r;
3130
3131 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
3132 if (r < 0)
3133 return r;
3134 }
3135
3136 if (link_dhcp6_enabled(link) ||
3137 link_ipv6_accept_ra_enabled(link)) {
3138 r = dhcp6_configure(link);
3139 if (r < 0)
3140 return r;
3141 }
3142
3143 if (link_ipv6_accept_ra_enabled(link)) {
3144 r = ndisc_configure(link);
3145 if (r < 0)
3146 return r;
3147 }
3148
3149 if (link_radv_enabled(link)) {
3150 r = radv_configure(link);
3151 if (r < 0)
3152 return r;
3153 }
3154
3155 if (link_lldp_rx_enabled(link)) {
3156 r = sd_lldp_new(&link->lldp);
3157 if (r < 0)
3158 return r;
3159
3160 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
3161 if (r < 0)
3162 return r;
3163
3164 r = sd_lldp_match_capabilities(link->lldp,
3165 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
3166 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
3167 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
3168 if (r < 0)
3169 return r;
3170
3171 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
3172 if (r < 0)
3173 return r;
3174
3175 r = sd_lldp_attach_event(link->lldp, NULL, 0);
3176 if (r < 0)
3177 return r;
3178
3179 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
3180 if (r < 0)
3181 return r;
3182
3183 r = link_update_lldp(link);
3184 if (r < 0)
3185 return r;
3186 }
3187
3188 r = link_set_mtu(link, link->network->mtu, link->network->mtu_is_set);
3189 if (r < 0)
3190 return r;
3191
3192 if (socket_ipv6_is_supported()) {
3193 r = link_configure_addrgen_mode(link);
3194 if (r < 0)
3195 return r;
3196 }
3197
3198 return link_configure_after_setting_mtu(link);
3199 }
3200
3201 static int link_configure_after_setting_mtu(Link *link) {
3202 int r;
3203
3204 assert(link);
3205 assert(link->network);
3206 assert(link->state == LINK_STATE_PENDING);
3207
3208 if (link->setting_mtu)
3209 return 0;
3210
3211 if (link_has_carrier(link) || link->network->configure_without_carrier) {
3212 r = link_acquire_conf(link);
3213 if (r < 0)
3214 return r;
3215 }
3216
3217 return link_enter_join_netdev(link);
3218 }
3219
3220 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3221 assert(duid);
3222
3223 if (duid->raw_data_len > 0)
3224 return 0;
3225
3226 if (duid->type != DUID_TYPE_UUID)
3227 return -EINVAL;
3228
3229 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3230 duid->raw_data_len = sizeof(sd_id128_t);
3231
3232 return 1;
3233 }
3234
3235 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3236 Manager *manager = userdata;
3237 const sd_bus_error *e;
3238 const void *a;
3239 size_t sz;
3240 DUID *duid;
3241 Link *link;
3242 int r;
3243
3244 assert(m);
3245 assert(manager);
3246
3247 e = sd_bus_message_get_error(m);
3248 if (e) {
3249 log_error_errno(sd_bus_error_get_errno(e),
3250 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3251 e->message);
3252 goto configure;
3253 }
3254
3255 r = sd_bus_message_read_array(m, 'y', &a, &sz);
3256 if (r < 0)
3257 goto configure;
3258
3259 if (sz != sizeof(sd_id128_t)) {
3260 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3261 goto configure;
3262 }
3263
3264 memcpy(&manager->product_uuid, a, sz);
3265 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3266 (void) duid_set_uuid(duid, manager->product_uuid);
3267
3268 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3269
3270 configure:
3271 while ((link = set_steal_first(manager->links_requesting_uuid))) {
3272 r = link_configure(link);
3273 if (r < 0)
3274 log_link_error_errno(link, r, "Failed to configure link: %m");
3275 }
3276
3277 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3278
3279 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3280 * even if the method fails. */
3281 manager->has_product_uuid = true;
3282
3283 return 1;
3284 }
3285
3286 static bool link_requires_uuid(Link *link) {
3287 const DUID *duid;
3288
3289 assert(link);
3290 assert(link->manager);
3291 assert(link->network);
3292
3293 duid = link_get_duid(link);
3294 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3295 return false;
3296
3297 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3298 return true;
3299
3300 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3301 return true;
3302
3303 return false;
3304 }
3305
3306 static int link_configure_duid(Link *link) {
3307 Manager *m;
3308 DUID *duid;
3309 int r;
3310
3311 assert(link);
3312 assert(link->manager);
3313 assert(link->network);
3314
3315 m = link->manager;
3316 duid = link_get_duid(link);
3317
3318 if (!link_requires_uuid(link))
3319 return 1;
3320
3321 if (m->has_product_uuid) {
3322 (void) duid_set_uuid(duid, m->product_uuid);
3323 return 1;
3324 }
3325
3326 if (!m->links_requesting_uuid) {
3327 r = manager_request_product_uuid(m, link);
3328 if (r < 0) {
3329 if (r == -ENOMEM)
3330 return r;
3331
3332 log_link_warning_errno(link, r,
3333 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3334 return 1;
3335 }
3336 } else {
3337 r = set_put(m->links_requesting_uuid, link);
3338 if (r < 0)
3339 return log_oom();
3340
3341 r = set_put(m->duids_requesting_uuid, duid);
3342 if (r < 0)
3343 return log_oom();
3344 }
3345
3346 return 0;
3347 }
3348
3349 static int link_initialized_and_synced(Link *link) {
3350 Network *network;
3351 int r;
3352
3353 assert(link);
3354 assert(link->ifname);
3355 assert(link->manager);
3356
3357 if (link->state != LINK_STATE_PENDING)
3358 return 1;
3359
3360 log_link_debug(link, "Link state is up-to-date");
3361
3362 r = link_new_bound_by_list(link);
3363 if (r < 0)
3364 return r;
3365
3366 r = link_handle_bound_by_list(link);
3367 if (r < 0)
3368 return r;
3369
3370 if (!link->network) {
3371 r = network_get(link->manager, link->sd_device, link->ifname,
3372 &link->mac, &network);
3373 if (r == -ENOENT) {
3374 link_enter_unmanaged(link);
3375 return 1;
3376 } else if (r == 0 && network->unmanaged) {
3377 link_enter_unmanaged(link);
3378 return 0;
3379 } else if (r < 0)
3380 return r;
3381
3382 if (link->flags & IFF_LOOPBACK) {
3383 if (network->link_local != ADDRESS_FAMILY_NO)
3384 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3385
3386 if (network->dhcp != ADDRESS_FAMILY_NO)
3387 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3388
3389 if (network->dhcp_server)
3390 log_link_debug(link, "Ignoring DHCP server for loopback link");
3391 }
3392
3393 r = network_apply(network, link);
3394 if (r < 0)
3395 return r;
3396 }
3397
3398 r = link_new_bound_to_list(link);
3399 if (r < 0)
3400 return r;
3401
3402 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3403 * link_configure() is called later asynchronously. */
3404 r = link_configure_duid(link);
3405 if (r <= 0)
3406 return r;
3407
3408 r = link_configure(link);
3409 if (r < 0)
3410 return r;
3411
3412 return 1;
3413 }
3414
3415 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3416 (void) link_initialized_and_synced(link);
3417 return 1;
3418 }
3419
3420 int link_initialized(Link *link, sd_device *device) {
3421 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3422 int r;
3423
3424 assert(link);
3425 assert(link->manager);
3426 assert(link->manager->rtnl);
3427 assert(device);
3428
3429 if (link->state != LINK_STATE_PENDING)
3430 return 0;
3431
3432 if (link->sd_device)
3433 return 0;
3434
3435 log_link_debug(link, "udev initialized link");
3436
3437 link->sd_device = sd_device_ref(device);
3438
3439 /* udev has initialized the link, but we don't know if we have yet
3440 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3441 * when it returns we know that the pending NEWLINKs have already been
3442 * processed and that we are up-to-date */
3443
3444 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3445 link->ifindex);
3446 if (r < 0)
3447 return r;
3448
3449 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3450 link_netlink_destroy_callback, link);
3451 if (r < 0)
3452 return r;
3453
3454 link_ref(link);
3455
3456 return 0;
3457 }
3458
3459 static int link_load(Link *link) {
3460 _cleanup_free_ char *network_file = NULL,
3461 *addresses = NULL,
3462 *routes = NULL,
3463 *dhcp4_address = NULL,
3464 *ipv4ll_address = NULL;
3465 union in_addr_union address;
3466 union in_addr_union route_dst;
3467 const char *p;
3468 int r;
3469
3470 assert(link);
3471
3472 r = parse_env_file(NULL, link->state_file,
3473 "NETWORK_FILE", &network_file,
3474 "ADDRESSES", &addresses,
3475 "ROUTES", &routes,
3476 "DHCP4_ADDRESS", &dhcp4_address,
3477 "IPV4LL_ADDRESS", &ipv4ll_address);
3478 if (r < 0 && r != -ENOENT)
3479 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3480
3481 if (network_file) {
3482 Network *network;
3483 char *suffix;
3484
3485 /* drop suffix */
3486 suffix = strrchr(network_file, '.');
3487 if (!suffix) {
3488 log_link_debug(link, "Failed to get network name from %s", network_file);
3489 goto network_file_fail;
3490 }
3491 *suffix = '\0';
3492
3493 r = network_get_by_name(link->manager, basename(network_file), &network);
3494 if (r < 0) {
3495 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3496 goto network_file_fail;
3497 }
3498
3499 r = network_apply(network, link);
3500 if (r < 0)
3501 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3502 }
3503
3504 network_file_fail:
3505
3506 if (addresses) {
3507 p = addresses;
3508
3509 for (;;) {
3510 _cleanup_free_ char *address_str = NULL;
3511 char *prefixlen_str;
3512 int family;
3513 unsigned char prefixlen;
3514
3515 r = extract_first_word(&p, &address_str, NULL, 0);
3516 if (r < 0) {
3517 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3518 continue;
3519 }
3520 if (r == 0)
3521 break;
3522
3523 prefixlen_str = strchr(address_str, '/');
3524 if (!prefixlen_str) {
3525 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3526 continue;
3527 }
3528
3529 *prefixlen_str++ = '\0';
3530
3531 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3532 if (r != 1) {
3533 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3534 continue;
3535 }
3536
3537 r = in_addr_from_string_auto(address_str, &family, &address);
3538 if (r < 0) {
3539 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3540 continue;
3541 }
3542
3543 r = address_add(link, family, &address, prefixlen, NULL);
3544 if (r < 0)
3545 return log_link_error_errno(link, r, "Failed to add address: %m");
3546 }
3547 }
3548
3549 if (routes) {
3550 p = routes;
3551
3552 for (;;) {
3553 Route *route;
3554 _cleanup_free_ char *route_str = NULL;
3555 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3556 usec_t lifetime;
3557 char *prefixlen_str;
3558 int family;
3559 unsigned char prefixlen, tos, table;
3560 uint32_t priority;
3561
3562 r = extract_first_word(&p, &route_str, NULL, 0);
3563 if (r < 0) {
3564 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3565 continue;
3566 }
3567 if (r == 0)
3568 break;
3569
3570 prefixlen_str = strchr(route_str, '/');
3571 if (!prefixlen_str) {
3572 log_link_debug(link, "Failed to parse route %s", route_str);
3573 continue;
3574 }
3575
3576 *prefixlen_str++ = '\0';
3577
3578 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3579 if (r != 5) {
3580 log_link_debug(link,
3581 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3582 prefixlen_str);
3583 continue;
3584 }
3585
3586 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3587 if (r < 0) {
3588 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3589 continue;
3590 }
3591
3592 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3593 if (r < 0)
3594 return log_link_error_errno(link, r, "Failed to add route: %m");
3595
3596 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3597 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3598 0, route_expire_handler, route);
3599 if (r < 0)
3600 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3601 }
3602
3603 route->lifetime = lifetime;
3604 sd_event_source_unref(route->expire);
3605 route->expire = TAKE_PTR(expire);
3606 }
3607 }
3608
3609 if (dhcp4_address) {
3610 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3611 if (r < 0) {
3612 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3613 goto dhcp4_address_fail;
3614 }
3615
3616 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3617 if (r < 0)
3618 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3619
3620 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3621 if (r < 0)
3622 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3623 }
3624
3625 dhcp4_address_fail:
3626
3627 if (ipv4ll_address) {
3628 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3629 if (r < 0) {
3630 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3631 goto ipv4ll_address_fail;
3632 }
3633
3634 r = sd_ipv4ll_new(&link->ipv4ll);
3635 if (r < 0)
3636 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3637
3638 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3639 if (r < 0)
3640 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3641 }
3642
3643 ipv4ll_address_fail:
3644
3645 return 0;
3646 }
3647
3648 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3649 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3650 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3651 Link *link;
3652 int r;
3653
3654 assert(m);
3655 assert(m->rtnl);
3656 assert(message);
3657 assert(ret);
3658
3659 r = link_new(m, message, ret);
3660 if (r < 0)
3661 return r;
3662
3663 link = *ret;
3664
3665 log_link_debug(link, "Link %d added", link->ifindex);
3666
3667 r = link_load(link);
3668 if (r < 0)
3669 return r;
3670
3671 if (detect_container() <= 0) {
3672 /* not in a container, udev will be around */
3673 sprintf(ifindex_str, "n%d", link->ifindex);
3674 r = sd_device_new_from_device_id(&device, ifindex_str);
3675 if (r < 0) {
3676 log_link_warning_errno(link, r, "Could not find device: %m");
3677 goto failed;
3678 }
3679
3680 r = sd_device_get_is_initialized(device);
3681 if (r < 0) {
3682 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3683 goto failed;
3684 }
3685 if (r == 0) {
3686 /* not yet ready */
3687 log_link_debug(link, "link pending udev initialization...");
3688 return 0;
3689 }
3690
3691 r = device_is_renaming(device);
3692 if (r < 0) {
3693 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3694 goto failed;
3695 }
3696 if (r > 0) {
3697 log_link_debug(link, "Interface is under renaming, pending initialization.");
3698 return 0;
3699 }
3700
3701 r = link_initialized(link, device);
3702 if (r < 0)
3703 goto failed;
3704 } else {
3705 r = link_initialized_and_synced(link);
3706 if (r < 0)
3707 goto failed;
3708 }
3709
3710 return 0;
3711 failed:
3712 link_enter_failed(link);
3713 return r;
3714 }
3715
3716 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3717 int r;
3718
3719 assert(link);
3720
3721 log_link_info(link, "Gained IPv6LL");
3722
3723 link->ipv6ll_address = *address;
3724 link_check_ready(link);
3725
3726 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3727 r = link_acquire_ipv6_conf(link);
3728 if (r < 0) {
3729 link_enter_failed(link);
3730 return r;
3731 }
3732 }
3733
3734 return 0;
3735 }
3736
3737 static int link_carrier_gained(Link *link) {
3738 int r;
3739
3740 assert(link);
3741
3742 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3743 r = link_acquire_conf(link);
3744 if (r < 0) {
3745 link_enter_failed(link);
3746 return r;
3747 }
3748
3749 r = link_request_set_addresses(link);
3750 if (r < 0)
3751 return r;
3752 }
3753
3754 r = link_handle_bound_by_list(link);
3755 if (r < 0)
3756 return r;
3757
3758 return 0;
3759 }
3760
3761 static int link_carrier_lost(Link *link) {
3762 int r;
3763
3764 assert(link);
3765
3766 if (link->network && link->network->ignore_carrier_loss)
3767 return 0;
3768
3769 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3770 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3771 * configuration and stop the clients as well. */
3772 if (link->setting_mtu)
3773 return 0;
3774
3775 r = link_stop_clients(link);
3776 if (r < 0) {
3777 link_enter_failed(link);
3778 return r;
3779 }
3780
3781 if (link_dhcp4_server_enabled(link))
3782 (void) sd_dhcp_server_stop(link->dhcp_server);
3783
3784 r = link_drop_config(link);
3785 if (r < 0)
3786 return r;
3787
3788 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3789 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3790 r = link_drop_foreign_config(link);
3791 if (r < 0)
3792 return r;
3793 }
3794
3795 r = link_handle_bound_by_list(link);
3796 if (r < 0)
3797 return r;
3798
3799 return 0;
3800 }
3801
3802 int link_carrier_reset(Link *link) {
3803 int r;
3804
3805 assert(link);
3806
3807 if (link_has_carrier(link)) {
3808 r = link_carrier_lost(link);
3809 if (r < 0)
3810 return r;
3811
3812 r = link_carrier_gained(link);
3813 if (r < 0)
3814 return r;
3815
3816 log_link_info(link, "Reset carrier");
3817 }
3818
3819 return 0;
3820 }
3821
3822 int link_update(Link *link, sd_netlink_message *m) {
3823 struct ether_addr mac;
3824 const char *ifname;
3825 uint32_t mtu;
3826 bool had_carrier, carrier_gained, carrier_lost;
3827 int r;
3828
3829 assert(link);
3830 assert(link->ifname);
3831 assert(m);
3832
3833 if (link->state == LINK_STATE_LINGER) {
3834 log_link_info(link, "Link readded");
3835 link_set_state(link, LINK_STATE_CONFIGURING);
3836
3837 r = link_new_carrier_maps(link);
3838 if (r < 0)
3839 return r;
3840 }
3841
3842 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3843 if (r >= 0 && !streq(ifname, link->ifname)) {
3844 Manager *manager = link->manager;
3845
3846 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3847
3848 link_drop(link);
3849 r = link_add(manager, m, &link);
3850 if (r < 0)
3851 return r;
3852 }
3853
3854 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3855 if (r >= 0 && mtu > 0) {
3856 link->mtu = mtu;
3857 if (link->original_mtu == 0) {
3858 link->original_mtu = mtu;
3859 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3860 }
3861
3862 if (link->dhcp_client) {
3863 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3864 link->mtu);
3865 if (r < 0)
3866 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3867 }
3868
3869 if (link->radv) {
3870 r = sd_radv_set_mtu(link->radv, link->mtu);
3871 if (r < 0)
3872 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3873 }
3874 }
3875
3876 /* The kernel may broadcast NEWLINK messages without the MAC address
3877 set, simply ignore them. */
3878 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3879 if (r >= 0) {
3880 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3881 ETH_ALEN)) {
3882
3883 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3884 ETH_ALEN);
3885
3886 log_link_debug(link, "MAC address: "
3887 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3888 mac.ether_addr_octet[0],
3889 mac.ether_addr_octet[1],
3890 mac.ether_addr_octet[2],
3891 mac.ether_addr_octet[3],
3892 mac.ether_addr_octet[4],
3893 mac.ether_addr_octet[5]);
3894
3895 if (link->ipv4ll) {
3896 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3897 if (r < 0)
3898 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3899 }
3900
3901 if (link->dhcp_client) {
3902 r = sd_dhcp_client_set_mac(link->dhcp_client,
3903 (const uint8_t *) &link->mac,
3904 sizeof (link->mac),
3905 ARPHRD_ETHER);
3906 if (r < 0)
3907 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3908
3909 r = dhcp4_set_client_identifier(link);
3910 if (r < 0)
3911 return r;
3912 }
3913
3914 if (link->dhcp6_client) {
3915 const DUID* duid = link_get_duid(link);
3916
3917 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3918 (const uint8_t *) &link->mac,
3919 sizeof (link->mac),
3920 ARPHRD_ETHER);
3921 if (r < 0)
3922 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3923
3924 if (link->network->iaid_set) {
3925 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3926 link->network->iaid);
3927 if (r < 0)
3928 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3929 }
3930
3931 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3932 duid->type,
3933 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3934 duid->raw_data_len);
3935 if (r < 0)
3936 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3937 }
3938
3939 if (link->radv) {
3940 r = sd_radv_set_mac(link->radv, &link->mac);
3941 if (r < 0)
3942 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3943 }
3944
3945 if (link->ndisc) {
3946 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3947 if (r < 0)
3948 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3949 }
3950 }
3951 }
3952
3953 had_carrier = link_has_carrier(link);
3954
3955 r = link_update_flags(link, m);
3956 if (r < 0)
3957 return r;
3958
3959 r = link_update_lldp(link);
3960 if (r < 0)
3961 return r;
3962
3963 carrier_gained = !had_carrier && link_has_carrier(link);
3964 carrier_lost = had_carrier && !link_has_carrier(link);
3965
3966 if (carrier_gained) {
3967 log_link_info(link, "Gained carrier");
3968
3969 r = link_carrier_gained(link);
3970 if (r < 0)
3971 return r;
3972 } else if (carrier_lost) {
3973 log_link_info(link, "Lost carrier");
3974
3975 r = link_carrier_lost(link);
3976 if (r < 0)
3977 return r;
3978 }
3979
3980 return 0;
3981 }
3982
3983 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3984 bool space = false;
3985 Iterator i;
3986 Link *link;
3987
3988 assert(f);
3989 assert(prefix);
3990
3991 if (hashmap_isempty(h))
3992 return;
3993
3994 fputs(prefix, f);
3995 HASHMAP_FOREACH(link, h, i) {
3996 if (space)
3997 fputc(' ', f);
3998
3999 fprintf(f, "%i", link->ifindex);
4000 space = true;
4001 }
4002
4003 fputc('\n', f);
4004 }
4005
4006 int link_save(Link *link) {
4007 _cleanup_free_ char *temp_path = NULL;
4008 _cleanup_fclose_ FILE *f = NULL;
4009 const char *admin_state, *oper_state;
4010 Address *a;
4011 Route *route;
4012 Iterator i;
4013 int r;
4014
4015 assert(link);
4016 assert(link->state_file);
4017 assert(link->lease_file);
4018 assert(link->manager);
4019
4020 if (link->state == LINK_STATE_LINGER) {
4021 unlink(link->state_file);
4022 return 0;
4023 }
4024
4025 link_lldp_save(link);
4026
4027 admin_state = link_state_to_string(link->state);
4028 assert(admin_state);
4029
4030 oper_state = link_operstate_to_string(link->operstate);
4031 assert(oper_state);
4032
4033 r = fopen_temporary(link->state_file, &f, &temp_path);
4034 if (r < 0)
4035 goto fail;
4036
4037 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
4038 (void) fchmod(fileno(f), 0644);
4039
4040 fprintf(f,
4041 "# This is private data. Do not parse.\n"
4042 "ADMIN_STATE=%s\n"
4043 "OPER_STATE=%s\n",
4044 admin_state, oper_state);
4045
4046 if (link->network) {
4047 bool space;
4048 sd_dhcp6_lease *dhcp6_lease = NULL;
4049 const char *dhcp_domainname = NULL;
4050 char **dhcp6_domains = NULL;
4051 char **dhcp_domains = NULL;
4052 unsigned j;
4053
4054 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4055 yes_no(link->network->required_for_online));
4056
4057 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
4058 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
4059
4060 if (link->dhcp6_client) {
4061 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
4062 if (r < 0 && r != -ENOMSG)
4063 log_link_debug(link, "No DHCPv6 lease");
4064 }
4065
4066 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4067
4068 fputs("DNS=", f);
4069 space = false;
4070
4071 for (j = 0; j < link->network->n_dns; j++) {
4072 _cleanup_free_ char *b = NULL;
4073
4074 r = in_addr_to_string(link->network->dns[j].family,
4075 &link->network->dns[j].address, &b);
4076 if (r < 0) {
4077 log_debug_errno(r, "Failed to format address, ignoring: %m");
4078 continue;
4079 }
4080
4081 if (space)
4082 fputc(' ', f);
4083 fputs(b, f);
4084 space = true;
4085 }
4086
4087 if (link->network->dhcp_use_dns &&
4088 link->dhcp_lease) {
4089 const struct in_addr *addresses;
4090
4091 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
4092 if (r > 0)
4093 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4094 space = true;
4095 }
4096
4097 if (link->network->dhcp_use_dns && dhcp6_lease) {
4098 struct in6_addr *in6_addrs;
4099
4100 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
4101 if (r > 0) {
4102 if (space)
4103 fputc(' ', f);
4104 serialize_in6_addrs(f, in6_addrs, r);
4105 space = true;
4106 }
4107 }
4108
4109 /* Make sure to flush out old entries before we use the NDISC data */
4110 ndisc_vacuum(link);
4111
4112 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4113 NDiscRDNSS *dd;
4114
4115 SET_FOREACH(dd, link->ndisc_rdnss, i) {
4116 if (space)
4117 fputc(' ', f);
4118
4119 serialize_in6_addrs(f, &dd->address, 1);
4120 space = true;
4121 }
4122 }
4123
4124 fputc('\n', f);
4125
4126 fputs("NTP=", f);
4127 space = false;
4128 fputstrv(f, link->network->ntp, NULL, &space);
4129
4130 if (link->network->dhcp_use_ntp &&
4131 link->dhcp_lease) {
4132 const struct in_addr *addresses;
4133
4134 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
4135 if (r > 0)
4136 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4137 space = true;
4138 }
4139
4140 if (link->network->dhcp_use_ntp && dhcp6_lease) {
4141 struct in6_addr *in6_addrs;
4142 char **hosts;
4143
4144 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
4145 &in6_addrs);
4146 if (r > 0) {
4147 if (space)
4148 fputc(' ', f);
4149 serialize_in6_addrs(f, in6_addrs, r);
4150 space = true;
4151 }
4152
4153 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
4154 if (r > 0)
4155 fputstrv(f, hosts, NULL, &space);
4156 }
4157
4158 fputc('\n', f);
4159
4160 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4161 if (link->dhcp_lease) {
4162 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4163 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4164 }
4165 if (dhcp6_lease)
4166 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4167 }
4168
4169 ordered_set_print(f, "DOMAINS=", link->network->search_domains);
4170
4171 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4172 NDiscDNSSL *dd;
4173
4174 if (dhcp_domainname)
4175 fputs_with_space(f, dhcp_domainname, NULL, &space);
4176 if (dhcp_domains)
4177 fputstrv(f, dhcp_domains, NULL, &space);
4178 if (dhcp6_domains)
4179 fputstrv(f, dhcp6_domains, NULL, &space);
4180
4181 SET_FOREACH(dd, link->ndisc_dnssl, i)
4182 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4183 }
4184
4185 fputc('\n', f);
4186
4187 ordered_set_print(f, "ROUTE_DOMAINS=", link->network->route_domains);
4188
4189 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4190 NDiscDNSSL *dd;
4191
4192 if (dhcp_domainname)
4193 fputs_with_space(f, dhcp_domainname, NULL, &space);
4194 if (dhcp_domains)
4195 fputstrv(f, dhcp_domains, NULL, &space);
4196 if (dhcp6_domains)
4197 fputstrv(f, dhcp6_domains, NULL, &space);
4198
4199 SET_FOREACH(dd, link->ndisc_dnssl, i)
4200 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4201 }
4202
4203 fputc('\n', f);
4204
4205 fprintf(f, "LLMNR=%s\n",
4206 resolve_support_to_string(link->network->llmnr));
4207 fprintf(f, "MDNS=%s\n",
4208 resolve_support_to_string(link->network->mdns));
4209 if (link->network->dns_default_route >= 0)
4210 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
4211
4212 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4213 fprintf(f, "DNS_OVER_TLS=%s\n",
4214 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
4215
4216 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
4217 fprintf(f, "DNSSEC=%s\n",
4218 dnssec_mode_to_string(link->network->dnssec_mode));
4219
4220 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
4221 const char *n;
4222
4223 fputs("DNSSEC_NTA=", f);
4224 space = false;
4225 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
4226 fputs_with_space(f, n, NULL, &space);
4227 fputc('\n', f);
4228 }
4229
4230 fputs("ADDRESSES=", f);
4231 space = false;
4232 SET_FOREACH(a, link->addresses, i) {
4233 _cleanup_free_ char *address_str = NULL;
4234
4235 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4236 if (r < 0)
4237 goto fail;
4238
4239 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4240 space = true;
4241 }
4242 fputc('\n', f);
4243
4244 fputs("ROUTES=", f);
4245 space = false;
4246 SET_FOREACH(route, link->routes, i) {
4247 _cleanup_free_ char *route_str = NULL;
4248
4249 r = in_addr_to_string(route->family, &route->dst, &route_str);
4250 if (r < 0)
4251 goto fail;
4252
4253 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4254 space ? " " : "", route_str,
4255 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4256 space = true;
4257 }
4258
4259 fputc('\n', f);
4260 }
4261
4262 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4263 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4264
4265 if (link->dhcp_lease) {
4266 struct in_addr address;
4267 const char *tz = NULL;
4268
4269 assert(link->network);
4270
4271 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
4272 if (r >= 0)
4273 fprintf(f, "TIMEZONE=%s\n", tz);
4274
4275 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
4276 if (r >= 0) {
4277 fputs("DHCP4_ADDRESS=", f);
4278 serialize_in_addrs(f, &address, 1, false, NULL);
4279 fputc('\n', f);
4280 }
4281
4282 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4283 if (r < 0)
4284 goto fail;
4285
4286 fprintf(f,
4287 "DHCP_LEASE=%s\n",
4288 link->lease_file);
4289 } else
4290 unlink(link->lease_file);
4291
4292 if (link->ipv4ll) {
4293 struct in_addr address;
4294
4295 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4296 if (r >= 0) {
4297 fputs("IPV4LL_ADDRESS=", f);
4298 serialize_in_addrs(f, &address, 1, false, NULL);
4299 fputc('\n', f);
4300 }
4301 }
4302
4303 r = fflush_and_check(f);
4304 if (r < 0)
4305 goto fail;
4306
4307 if (rename(temp_path, link->state_file) < 0) {
4308 r = -errno;
4309 goto fail;
4310 }
4311
4312 return 0;
4313
4314 fail:
4315 (void) unlink(link->state_file);
4316 if (temp_path)
4317 (void) unlink(temp_path);
4318
4319 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4320 }
4321
4322 /* The serialized state in /run is no longer up-to-date. */
4323 void link_dirty(Link *link) {
4324 int r;
4325
4326 assert(link);
4327
4328 /* mark manager dirty as link is dirty */
4329 manager_dirty(link->manager);
4330
4331 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
4332 if (r < 0)
4333 /* allocation errors are ignored */
4334 return;
4335
4336 r = set_put(link->manager->dirty_links, link);
4337 if (r <= 0)
4338 /* don't take another ref if the link was already dirty */
4339 return;
4340
4341 link_ref(link);
4342 }
4343
4344 /* The serialized state in /run is up-to-date */
4345 void link_clean(Link *link) {
4346 assert(link);
4347 assert(link->manager);
4348
4349 link_unref(set_remove(link->manager->dirty_links, link));
4350 }
4351
4352 static const char* const link_state_table[_LINK_STATE_MAX] = {
4353 [LINK_STATE_PENDING] = "pending",
4354 [LINK_STATE_CONFIGURING] = "configuring",
4355 [LINK_STATE_CONFIGURED] = "configured",
4356 [LINK_STATE_UNMANAGED] = "unmanaged",
4357 [LINK_STATE_FAILED] = "failed",
4358 [LINK_STATE_LINGER] = "linger",
4359 };
4360
4361 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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