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networkd: stop clients when networkd shuts down (#12463)
[thirdparty/systemd.git] / src / network / networkd-link.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <netinet/ether.h>
4 #include <linux/if.h>
5 #include <linux/can/netlink.h>
6 #include <unistd.h>
7
8 #include "alloc-util.h"
9 #include "bus-util.h"
10 #include "dhcp-identifier.h"
11 #include "dhcp-lease-internal.h"
12 #include "env-file.h"
13 #include "fd-util.h"
14 #include "fileio.h"
15 #include "missing_network.h"
16 #include "netdev/vrf.h"
17 #include "netlink-util.h"
18 #include "network-internal.h"
19 #include "networkd-ipv6-proxy-ndp.h"
20 #include "networkd-lldp-tx.h"
21 #include "networkd-manager.h"
22 #include "networkd-ndisc.h"
23 #include "networkd-neighbor.h"
24 #include "networkd-radv.h"
25 #include "networkd-routing-policy-rule.h"
26 #include "set.h"
27 #include "socket-util.h"
28 #include "stdio-util.h"
29 #include "string-table.h"
30 #include "strv.h"
31 #include "sysctl-util.h"
32 #include "tmpfile-util.h"
33 #include "udev-util.h"
34 #include "util.h"
35 #include "virt.h"
36
37 uint32_t link_get_vrf_table(Link *link) {
38 return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
39 }
40
41 uint32_t link_get_dhcp_route_table(Link *link) {
42 /* When the interface is part of an VRF use the VRFs routing table, unless
43 * another table is explicitly specified. */
44 if (link->network->dhcp_route_table_set)
45 return link->network->dhcp_route_table;
46 return link_get_vrf_table(link);
47 }
48
49 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
50 if (link->network->ipv6_accept_ra_route_table_set)
51 return link->network->ipv6_accept_ra_route_table;
52 return link_get_vrf_table(link);
53 }
54
55 DUID* link_get_duid(Link *link) {
56 if (link->network->duid.type != _DUID_TYPE_INVALID)
57 return &link->network->duid;
58 else
59 return &link->manager->duid;
60 }
61
62 static bool link_dhcp6_enabled(Link *link) {
63 assert(link);
64
65 if (!socket_ipv6_is_supported())
66 return false;
67
68 if (link->flags & IFF_LOOPBACK)
69 return false;
70
71 if (!link->network)
72 return false;
73
74 if (link->network->bond)
75 return false;
76
77 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
78 return false;
79
80 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
81 }
82
83 static bool link_dhcp4_enabled(Link *link) {
84 assert(link);
85
86 if (link->flags & IFF_LOOPBACK)
87 return false;
88
89 if (!link->network)
90 return false;
91
92 if (link->network->bond)
93 return false;
94
95 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
96 }
97
98 static bool link_dhcp4_server_enabled(Link *link) {
99 assert(link);
100
101 if (link->flags & IFF_LOOPBACK)
102 return false;
103
104 if (!link->network)
105 return false;
106
107 if (link->network->bond)
108 return false;
109
110 return link->network->dhcp_server;
111 }
112
113 bool link_ipv4ll_enabled(Link *link) {
114 assert(link);
115
116 if (link->flags & IFF_LOOPBACK)
117 return false;
118
119 if (!link->network)
120 return false;
121
122 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard"))
123 return false;
124
125 if (link->network->bond)
126 return false;
127
128 return link->network->link_local & ADDRESS_FAMILY_IPV4;
129 }
130
131 bool link_ipv4ll_fallback_enabled(Link *link) {
132 assert(link);
133
134 if (link->flags & IFF_LOOPBACK)
135 return false;
136
137 if (!link->network)
138 return false;
139
140 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard"))
141 return false;
142
143 if (link->network->bond)
144 return false;
145
146 return link->network->link_local & ADDRESS_FAMILY_FALLBACK_IPV4;
147 }
148
149 static bool link_ipv6ll_enabled(Link *link) {
150 assert(link);
151
152 if (!socket_ipv6_is_supported())
153 return false;
154
155 if (link->flags & IFF_LOOPBACK)
156 return false;
157
158 if (!link->network)
159 return false;
160
161 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard"))
162 return false;
163
164 if (link->network->bond)
165 return false;
166
167 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
168 return false;
169
170 return link->network->link_local & ADDRESS_FAMILY_IPV6;
171 }
172
173 static bool link_ipv6_enabled(Link *link) {
174 assert(link);
175
176 if (!socket_ipv6_is_supported())
177 return false;
178
179 if (link->network->bond)
180 return false;
181
182 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
183 return false;
184
185 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
186 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
187 }
188
189 static bool link_radv_enabled(Link *link) {
190 assert(link);
191
192 if (!link_ipv6ll_enabled(link))
193 return false;
194
195 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
196 }
197
198 static bool link_lldp_rx_enabled(Link *link) {
199 assert(link);
200
201 if (link->flags & IFF_LOOPBACK)
202 return false;
203
204 if (link->iftype != ARPHRD_ETHER)
205 return false;
206
207 if (!link->network)
208 return false;
209
210 /* LLDP should be handled on bridge slaves as those have a direct
211 * connection to their peers not on the bridge master. Linux doesn't
212 * even (by default) forward lldp packets to the bridge master.*/
213 if (streq_ptr("bridge", link->kind))
214 return false;
215
216 return link->network->lldp_mode != LLDP_MODE_NO;
217 }
218
219 static bool link_lldp_emit_enabled(Link *link) {
220 assert(link);
221
222 if (link->flags & IFF_LOOPBACK)
223 return false;
224
225 if (link->iftype != ARPHRD_ETHER)
226 return false;
227
228 if (!link->network)
229 return false;
230
231 return link->network->lldp_emit != LLDP_EMIT_NO;
232 }
233
234 static bool link_ipv4_forward_enabled(Link *link) {
235 assert(link);
236
237 if (link->flags & IFF_LOOPBACK)
238 return false;
239
240 if (!link->network)
241 return false;
242
243 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
244 return false;
245
246 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
247 }
248
249 static bool link_ipv6_forward_enabled(Link *link) {
250 assert(link);
251
252 if (!socket_ipv6_is_supported())
253 return false;
254
255 if (link->flags & IFF_LOOPBACK)
256 return false;
257
258 if (!link->network)
259 return false;
260
261 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
262 return false;
263
264 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
265 return false;
266
267 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
268 }
269
270 static bool link_proxy_arp_enabled(Link *link) {
271 assert(link);
272
273 if (link->flags & IFF_LOOPBACK)
274 return false;
275
276 if (!link->network)
277 return false;
278
279 if (link->network->proxy_arp < 0)
280 return false;
281
282 return true;
283 }
284
285 static bool link_ipv6_accept_ra_enabled(Link *link) {
286 assert(link);
287
288 if (!socket_ipv6_is_supported())
289 return false;
290
291 if (link->flags & IFF_LOOPBACK)
292 return false;
293
294 if (!link->network)
295 return false;
296
297 if (!link_ipv6ll_enabled(link))
298 return false;
299
300 /* If unset use system default (enabled if local forwarding is disabled.
301 * disabled if local forwarding is enabled).
302 * If set, ignore or enforce RA independent of local forwarding state.
303 */
304 if (link->network->ipv6_accept_ra < 0)
305 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
306 return !link_ipv6_forward_enabled(link);
307 else if (link->network->ipv6_accept_ra > 0)
308 /* accept RA even if ip_forward is enabled */
309 return true;
310 else
311 /* ignore RA */
312 return false;
313 }
314
315 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
316 assert(link);
317
318 if (!socket_ipv6_is_supported())
319 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
320
321 if (link->flags & IFF_LOOPBACK)
322 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
323
324 if (!link->network)
325 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
326
327 return link->network->ipv6_privacy_extensions;
328 }
329
330 static int link_enable_ipv6(Link *link) {
331 bool disabled;
332 int r;
333
334 if (link->flags & IFF_LOOPBACK)
335 return 0;
336
337 disabled = !link_ipv6_enabled(link);
338
339 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", disabled);
340 if (r < 0)
341 log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m",
342 enable_disable(!disabled), link->ifname);
343 else
344 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
345
346 return 0;
347 }
348
349 static bool link_is_enslaved(Link *link) {
350 if (link->flags & IFF_SLAVE)
351 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
352 return true;
353
354 if (!link->enslaved_raw)
355 return false;
356
357 if (!link->network)
358 return false;
359
360 if (link->network->bridge)
361 /* TODO: support the case when link is not managed by networkd. */
362 return true;
363
364 return false;
365 }
366
367 static void link_update_master_operstate(Link *link, NetDev *netdev) {
368 Link *master;
369
370 if (!netdev)
371 return;
372
373 if (link_get(link->manager, netdev->ifindex, &master) < 0)
374 return;
375
376 link_update_operstate(master, true);
377 }
378
379 void link_update_operstate(Link *link, bool also_update_master) {
380 LinkOperationalState operstate;
381 Iterator i;
382
383 assert(link);
384
385 if (link->kernel_operstate == IF_OPER_DORMANT)
386 operstate = LINK_OPERSTATE_DORMANT;
387 else if (link_has_carrier(link)) {
388 Address *address;
389 uint8_t scope = RT_SCOPE_NOWHERE;
390
391 /* if we have carrier, check what addresses we have */
392 SET_FOREACH(address, link->addresses, i) {
393 if (!address_is_ready(address))
394 continue;
395
396 if (address->scope < scope)
397 scope = address->scope;
398 }
399
400 /* for operstate we also take foreign addresses into account */
401 SET_FOREACH(address, link->addresses_foreign, i) {
402 if (!address_is_ready(address))
403 continue;
404
405 if (address->scope < scope)
406 scope = address->scope;
407 }
408
409 if (scope < RT_SCOPE_SITE)
410 /* universally accessible addresses found */
411 operstate = LINK_OPERSTATE_ROUTABLE;
412 else if (scope < RT_SCOPE_HOST)
413 /* only link or site local addresses found */
414 operstate = LINK_OPERSTATE_DEGRADED;
415 else
416 /* no useful addresses found */
417 operstate = LINK_OPERSTATE_CARRIER;
418 } else if (link->flags & IFF_UP)
419 operstate = LINK_OPERSTATE_NO_CARRIER;
420 else
421 operstate = LINK_OPERSTATE_OFF;
422
423 if (IN_SET(operstate, LINK_OPERSTATE_DEGRADED, LINK_OPERSTATE_CARRIER) &&
424 link_is_enslaved(link))
425 operstate = LINK_OPERSTATE_ENSLAVED;
426
427 if (operstate >= LINK_OPERSTATE_CARRIER) {
428 Link *slave;
429
430 SET_FOREACH(slave, link->slaves, i) {
431 link_update_operstate(slave, false);
432
433 if (slave->operstate < LINK_OPERSTATE_CARRIER)
434 operstate = LINK_OPERSTATE_DEGRADED_CARRIER;
435 }
436 }
437
438 if (link->operstate != operstate) {
439 link->operstate = operstate;
440 link_send_changed(link, "OperationalState", NULL);
441 link_dirty(link);
442 }
443
444 if (also_update_master && link->network) {
445 link_update_master_operstate(link, link->network->bond);
446 link_update_master_operstate(link, link->network->bridge);
447 }
448 }
449
450 #define FLAG_STRING(string, flag, old, new) \
451 (((old ^ new) & flag) \
452 ? ((old & flag) ? (" -" string) : (" +" string)) \
453 : "")
454
455 static int link_update_flags(Link *link, sd_netlink_message *m) {
456 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
457 uint8_t operstate;
458 int r;
459
460 assert(link);
461
462 r = sd_rtnl_message_link_get_flags(m, &flags);
463 if (r < 0)
464 return log_link_warning_errno(link, r, "Could not get link flags: %m");
465
466 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
467 if (r < 0)
468 /* if we got a message without operstate, take it to mean
469 the state was unchanged */
470 operstate = link->kernel_operstate;
471
472 if ((link->flags == flags) && (link->kernel_operstate == operstate))
473 return 0;
474
475 if (link->flags != flags) {
476 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",
477 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
478 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
479 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
480 FLAG_STRING("UP", IFF_UP, link->flags, flags),
481 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
482 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
483 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
484 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
485 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
486 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
487 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
488 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
489 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
490 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
491 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
492 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
493 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
494 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
495 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
496
497 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
498 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
499 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
500 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
501 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
502 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
503 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
504 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
505
506 /* link flags are currently at most 18 bits, let's align to
507 * printing 20 */
508 if (unknown_flags_added)
509 log_link_debug(link,
510 "Unknown link flags gained: %#.5x (ignoring)",
511 unknown_flags_added);
512
513 if (unknown_flags_removed)
514 log_link_debug(link,
515 "Unknown link flags lost: %#.5x (ignoring)",
516 unknown_flags_removed);
517 }
518
519 link->flags = flags;
520 link->kernel_operstate = operstate;
521
522 link_update_operstate(link, true);
523
524 return 0;
525 }
526
527 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_unref);
528
529 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
530 _cleanup_(link_unrefp) Link *link = NULL;
531 uint16_t type;
532 const char *ifname, *kind = NULL;
533 int r, ifindex;
534 unsigned short iftype;
535
536 assert(manager);
537 assert(message);
538 assert(ret);
539
540 /* check for link kind */
541 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
542 if (r == 0) {
543 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
544 r = sd_netlink_message_exit_container(message);
545 if (r < 0)
546 return r;
547 }
548
549 r = sd_netlink_message_get_type(message, &type);
550 if (r < 0)
551 return r;
552 else if (type != RTM_NEWLINK)
553 return -EINVAL;
554
555 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
556 if (r < 0)
557 return r;
558 else if (ifindex <= 0)
559 return -EINVAL;
560
561 r = sd_rtnl_message_link_get_type(message, &iftype);
562 if (r < 0)
563 return r;
564
565 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
566 if (r < 0)
567 return r;
568
569 link = new(Link, 1);
570 if (!link)
571 return -ENOMEM;
572
573 *link = (Link) {
574 .n_ref = 1,
575 .manager = manager,
576 .state = LINK_STATE_PENDING,
577 .rtnl_extended_attrs = true,
578 .ifindex = ifindex,
579 .iftype = iftype,
580 };
581
582 link->ifname = strdup(ifname);
583 if (!link->ifname)
584 return -ENOMEM;
585
586 if (kind) {
587 link->kind = strdup(kind);
588 if (!link->kind)
589 return -ENOMEM;
590 }
591
592 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
593 if (r < 0)
594 log_link_debug_errno(link, r, "New device has no master, continuing without");
595
596 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
597 if (r < 0)
598 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
599
600 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
601 return -ENOMEM;
602
603 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
604 return -ENOMEM;
605
606 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
607 return -ENOMEM;
608
609 r = hashmap_ensure_allocated(&manager->links, NULL);
610 if (r < 0)
611 return r;
612
613 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
614 if (r < 0)
615 return r;
616
617 r = link_update_flags(link, message);
618 if (r < 0)
619 return r;
620
621 *ret = TAKE_PTR(link);
622
623 return 0;
624 }
625
626 static Link *link_free(Link *link) {
627 Link *carrier;
628 Address *address;
629 Route *route;
630 Iterator i;
631
632 assert(link);
633
634 while ((route = set_first(link->routes)))
635 route_free(route);
636
637 while ((route = set_first(link->routes_foreign)))
638 route_free(route);
639
640 link->routes = set_free(link->routes);
641 link->routes_foreign = set_free(link->routes_foreign);
642
643 while ((address = set_first(link->addresses)))
644 address_free(address);
645
646 while ((address = set_first(link->addresses_foreign)))
647 address_free(address);
648
649 link->addresses = set_free(link->addresses);
650 link->addresses_foreign = set_free(link->addresses_foreign);
651
652 while ((address = link->pool_addresses)) {
653 LIST_REMOVE(addresses, link->pool_addresses, address);
654 address_free(address);
655 }
656
657 sd_dhcp_server_unref(link->dhcp_server);
658 sd_dhcp_client_unref(link->dhcp_client);
659 sd_dhcp_lease_unref(link->dhcp_lease);
660
661 link_lldp_emit_stop(link);
662
663 free(link->lease_file);
664
665 sd_lldp_unref(link->lldp);
666 free(link->lldp_file);
667
668 ndisc_flush(link);
669
670 sd_ipv4ll_unref(link->ipv4ll);
671 sd_dhcp6_client_unref(link->dhcp6_client);
672 sd_ndisc_unref(link->ndisc);
673 sd_radv_unref(link->radv);
674
675 free(link->ifname);
676 free(link->kind);
677
678 (void) unlink(link->state_file);
679 free(link->state_file);
680
681 sd_device_unref(link->sd_device);
682
683 HASHMAP_FOREACH (carrier, link->bound_to_links, i)
684 hashmap_remove(link->bound_to_links, INT_TO_PTR(carrier->ifindex));
685 hashmap_free(link->bound_to_links);
686
687 HASHMAP_FOREACH (carrier, link->bound_by_links, i)
688 hashmap_remove(link->bound_by_links, INT_TO_PTR(carrier->ifindex));
689 hashmap_free(link->bound_by_links);
690
691 set_free_with_destructor(link->slaves, link_unref);
692
693 return mfree(link);
694 }
695
696 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
697
698 int link_get(Manager *m, int ifindex, Link **ret) {
699 Link *link;
700
701 assert(m);
702 assert(ifindex);
703 assert(ret);
704
705 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
706 if (!link)
707 return -ENODEV;
708
709 *ret = link;
710
711 return 0;
712 }
713
714 static void link_set_state(Link *link, LinkState state) {
715 assert(link);
716
717 if (link->state == state)
718 return;
719
720 log_link_debug(link, "State changed: %s -> %s",
721 link_state_to_string(link->state),
722 link_state_to_string(state));
723
724 link->state = state;
725
726 link_send_changed(link, "AdministrativeState", NULL);
727 }
728
729 static void link_enter_unmanaged(Link *link) {
730 assert(link);
731
732 log_link_debug(link, "Unmanaged");
733
734 link_set_state(link, LINK_STATE_UNMANAGED);
735
736 link_dirty(link);
737 }
738
739 int link_stop_clients(Link *link) {
740 int r = 0, k;
741
742 assert(link);
743 assert(link->manager);
744 assert(link->manager->event);
745
746 if (link->dhcp_client) {
747 k = sd_dhcp_client_stop(link->dhcp_client);
748 if (k < 0)
749 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
750 }
751
752 if (link->ipv4ll) {
753 k = sd_ipv4ll_stop(link->ipv4ll);
754 if (k < 0)
755 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
756 }
757
758 if (link->dhcp6_client) {
759 k = sd_dhcp6_client_stop(link->dhcp6_client);
760 if (k < 0)
761 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
762 }
763
764 if (link->ndisc) {
765 k = sd_ndisc_stop(link->ndisc);
766 if (k < 0)
767 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
768 }
769
770 if (link->radv) {
771 k = sd_radv_stop(link->radv);
772 if (k < 0)
773 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
774 }
775
776 link_lldp_emit_stop(link);
777 return r;
778 }
779
780 void link_enter_failed(Link *link) {
781 assert(link);
782
783 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
784 return;
785
786 log_link_warning(link, "Failed");
787
788 link_set_state(link, LINK_STATE_FAILED);
789
790 link_stop_clients(link);
791
792 link_dirty(link);
793 }
794
795 static Address* link_find_dhcp_server_address(Link *link) {
796 Address *address;
797
798 assert(link);
799 assert(link->network);
800
801 /* The first statically configured address if there is any */
802 LIST_FOREACH(addresses, address, link->network->static_addresses) {
803
804 if (address->family != AF_INET)
805 continue;
806
807 if (in_addr_is_null(address->family, &address->in_addr))
808 continue;
809
810 return address;
811 }
812
813 /* If that didn't work, find a suitable address we got from the pool */
814 LIST_FOREACH(addresses, address, link->pool_addresses) {
815 if (address->family != AF_INET)
816 continue;
817
818 return address;
819 }
820
821 return NULL;
822 }
823
824 static int link_join_netdevs_after_configured(Link *link) {
825 NetDev *netdev;
826 Iterator i;
827 int r;
828
829 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
830 if (netdev->ifindex > 0)
831 /* Assume already enslaved. */
832 continue;
833
834 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
835 continue;
836
837 log_struct(LOG_DEBUG,
838 LOG_LINK_INTERFACE(link),
839 LOG_NETDEV_INTERFACE(netdev),
840 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
841
842 r = netdev_join(netdev, link, NULL);
843 if (r < 0)
844 return log_struct_errno(LOG_WARNING, r,
845 LOG_LINK_INTERFACE(link),
846 LOG_NETDEV_INTERFACE(netdev),
847 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
848 }
849
850 return 0;
851 }
852
853 static void link_enter_configured(Link *link) {
854 assert(link);
855 assert(link->network);
856
857 if (link->state != LINK_STATE_CONFIGURING)
858 return;
859
860 log_link_info(link, "Configured");
861
862 link_set_state(link, LINK_STATE_CONFIGURED);
863
864 (void) link_join_netdevs_after_configured(link);
865
866 link_dirty(link);
867 }
868
869 static int link_request_set_routing_policy_rule(Link *link) {
870 RoutingPolicyRule *rule, *rrule = NULL;
871 int r;
872
873 assert(link);
874 assert(link->network);
875
876 link_set_state(link, LINK_STATE_CONFIGURING);
877 link->routing_policy_rules_configured = false;
878
879 LIST_FOREACH(rules, rule, link->network->rules) {
880 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
881 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif,
882 rule->protocol, &rule->sport, &rule->dport, &rrule);
883 if (r == 0) {
884 (void) routing_policy_rule_make_local(link->manager, rrule);
885 continue;
886 }
887
888 r = routing_policy_rule_configure(rule, link, NULL, false);
889 if (r < 0) {
890 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
891 link_enter_failed(link);
892 return r;
893 }
894
895 link->routing_policy_rule_messages++;
896 }
897
898 routing_policy_rule_purge(link->manager, link);
899 if (link->routing_policy_rule_messages == 0) {
900 link->routing_policy_rules_configured = true;
901 link_check_ready(link);
902 } else
903 log_link_debug(link, "Setting routing policy rules");
904
905 return 0;
906 }
907
908 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
909 int r;
910
911 assert(link);
912 assert(link->route_messages > 0);
913 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
914 LINK_STATE_FAILED, LINK_STATE_LINGER));
915
916 link->route_messages--;
917
918 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
919 return 1;
920
921 r = sd_netlink_message_get_errno(m);
922 if (r < 0 && r != -EEXIST)
923 log_link_warning_errno(link, r, "Could not set route: %m");
924
925 if (link->route_messages == 0) {
926 log_link_debug(link, "Routes set");
927 link->static_routes_configured = true;
928 link_check_ready(link);
929 }
930
931 return 1;
932 }
933
934 int link_request_set_routes(Link *link) {
935 enum {
936 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
937 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
938 _PHASE_MAX
939 } phase;
940 Route *rt;
941 int r;
942
943 assert(link);
944 assert(link->network);
945 assert(link->addresses_configured);
946 assert(link->address_messages == 0);
947 assert(link->state != _LINK_STATE_INVALID);
948
949 link_set_state(link, LINK_STATE_CONFIGURING);
950 link->static_routes_configured = false;
951
952 r = link_request_set_routing_policy_rule(link);
953 if (r < 0)
954 return r;
955
956 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
957 for (phase = 0; phase < _PHASE_MAX; phase++)
958 LIST_FOREACH(routes, rt, link->network->static_routes) {
959
960 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
961 continue;
962
963 r = route_configure(rt, link, route_handler);
964 if (r < 0) {
965 log_link_warning_errno(link, r, "Could not set routes: %m");
966 link_enter_failed(link);
967 return r;
968 }
969
970 link->route_messages++;
971 }
972
973 if (link->route_messages == 0) {
974 link->static_routes_configured = true;
975 link_check_ready(link);
976 } else
977 log_link_debug(link, "Setting routes");
978
979 return 0;
980 }
981
982 void link_check_ready(Link *link) {
983 Address *a;
984 Iterator i;
985
986 assert(link);
987
988 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
989 return;
990
991 if (!link->network)
992 return;
993
994 if (!link->addresses_configured)
995 return;
996
997 if (!link->neighbors_configured)
998 return;
999
1000 SET_FOREACH(a, link->addresses, i)
1001 if (!address_is_ready(a))
1002 return;
1003
1004 if (!link->addresses_ready) {
1005 link->addresses_ready = true;
1006 link_request_set_routes(link);
1007 }
1008
1009 if (!link->static_routes_configured)
1010 return;
1011
1012 if (!link->routing_policy_rules_configured)
1013 return;
1014
1015 if (link_ipv4ll_enabled(link) && !(link->ipv4ll_address && link->ipv4ll_route))
1016 return;
1017
1018 if (link_ipv6ll_enabled(link) &&
1019 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
1020 return;
1021
1022 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
1023 !(link->dhcp4_configured || link->dhcp6_configured) &&
1024 !(link_ipv4ll_fallback_enabled(link) && link->ipv4ll_address && link->ipv4ll_route))
1025 /* When DHCP is enabled, at least one protocol must provide an address, or
1026 * an IPv4ll fallback address must be configured. */
1027 return;
1028
1029 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
1030 return;
1031
1032 if (link->state != LINK_STATE_CONFIGURED)
1033 link_enter_configured(link);
1034
1035 return;
1036 }
1037
1038 static int link_request_set_neighbors(Link *link) {
1039 Neighbor *neighbor;
1040 int r;
1041
1042 assert(link);
1043 assert(link->network);
1044 assert(link->state != _LINK_STATE_INVALID);
1045
1046 link_set_state(link, LINK_STATE_CONFIGURING);
1047 link->neighbors_configured = false;
1048
1049 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1050 r = neighbor_configure(neighbor, link, NULL);
1051 if (r < 0) {
1052 log_link_warning_errno(link, r, "Could not set neighbor: %m");
1053 link_enter_failed(link);
1054 return r;
1055 }
1056 }
1057
1058 if (link->neighbor_messages == 0) {
1059 link->neighbors_configured = true;
1060 link_check_ready(link);
1061 } else
1062 log_link_debug(link, "Setting neighbors");
1063
1064 return 0;
1065 }
1066
1067 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1068 int r;
1069
1070 assert(rtnl);
1071 assert(m);
1072 assert(link);
1073 assert(link->ifname);
1074 assert(link->address_messages > 0);
1075 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1076 LINK_STATE_FAILED, LINK_STATE_LINGER));
1077
1078 link->address_messages--;
1079
1080 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1081 return 1;
1082
1083 r = sd_netlink_message_get_errno(m);
1084 if (r < 0 && r != -EEXIST)
1085 log_link_warning_errno(link, r, "could not set address: %m");
1086 else if (r >= 0)
1087 manager_rtnl_process_address(rtnl, m, link->manager);
1088
1089 if (link->address_messages == 0) {
1090 log_link_debug(link, "Addresses set");
1091 link->addresses_configured = true;
1092 link_check_ready(link);
1093 }
1094
1095 return 1;
1096 }
1097
1098 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1099 _cleanup_free_ struct in_addr *addresses = NULL;
1100 size_t n_addresses = 0, n_allocated = 0;
1101 unsigned i;
1102
1103 log_debug("Copying DNS server information from %s", link->ifname);
1104
1105 if (!link->network)
1106 return 0;
1107
1108 for (i = 0; i < link->network->n_dns; i++) {
1109 struct in_addr ia;
1110
1111 /* Only look for IPv4 addresses */
1112 if (link->network->dns[i].family != AF_INET)
1113 continue;
1114
1115 ia = link->network->dns[i].address.in;
1116
1117 /* Never propagate obviously borked data */
1118 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1119 continue;
1120
1121 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1122 return log_oom();
1123
1124 addresses[n_addresses++] = ia;
1125 }
1126
1127 if (link->network->dhcp_use_dns && link->dhcp_lease) {
1128 const struct in_addr *da = NULL;
1129 int j, n;
1130
1131 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
1132 if (n > 0) {
1133
1134 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1135 return log_oom();
1136
1137 for (j = 0; j < n; j++)
1138 if (in4_addr_is_non_local(&da[j]))
1139 addresses[n_addresses++] = da[j];
1140 }
1141 }
1142
1143 if (n_addresses <= 0)
1144 return 0;
1145
1146 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
1147 }
1148
1149 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1150 _cleanup_free_ struct in_addr *addresses = NULL;
1151 size_t n_addresses = 0, n_allocated = 0;
1152 char **a;
1153
1154 if (!link->network)
1155 return 0;
1156
1157 log_debug("Copying NTP server information from %s", link->ifname);
1158
1159 STRV_FOREACH(a, link->network->ntp) {
1160 struct in_addr ia;
1161
1162 /* Only look for IPv4 addresses */
1163 if (inet_pton(AF_INET, *a, &ia) <= 0)
1164 continue;
1165
1166 /* Never propagate obviously borked data */
1167 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1168 continue;
1169
1170 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1171 return log_oom();
1172
1173 addresses[n_addresses++] = ia;
1174 }
1175
1176 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1177 const struct in_addr *da = NULL;
1178 int j, n;
1179
1180 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1181 if (n > 0) {
1182
1183 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1184 return log_oom();
1185
1186 for (j = 0; j < n; j++)
1187 if (in4_addr_is_non_local(&da[j]))
1188 addresses[n_addresses++] = da[j];
1189 }
1190 }
1191
1192 if (n_addresses <= 0)
1193 return 0;
1194
1195 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1196 }
1197
1198 static int link_set_bridge_fdb(Link *link) {
1199 FdbEntry *fdb_entry;
1200 int r;
1201
1202 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1203 r = fdb_entry_configure(link, fdb_entry);
1204 if (r < 0)
1205 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1206 }
1207
1208 return 0;
1209 }
1210
1211 static int link_request_set_addresses(Link *link) {
1212 AddressLabel *label;
1213 Address *ad;
1214 int r;
1215
1216 assert(link);
1217 assert(link->network);
1218 assert(link->state != _LINK_STATE_INVALID);
1219
1220 link_set_state(link, LINK_STATE_CONFIGURING);
1221
1222 /* Reset all *_configured flags we are configuring. */
1223 link->addresses_configured = false;
1224 link->addresses_ready = false;
1225 link->neighbors_configured = false;
1226 link->static_routes_configured = false;
1227 link->routing_policy_rules_configured = false;
1228
1229 r = link_set_bridge_fdb(link);
1230 if (r < 0)
1231 return r;
1232
1233 r = link_request_set_neighbors(link);
1234 if (r < 0)
1235 return r;
1236
1237 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1238 bool update;
1239
1240 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1241
1242 r = address_configure(ad, link, address_handler, update);
1243 if (r < 0) {
1244 log_link_warning_errno(link, r, "Could not set addresses: %m");
1245 link_enter_failed(link);
1246 return r;
1247 }
1248
1249 link->address_messages++;
1250 }
1251
1252 LIST_FOREACH(labels, label, link->network->address_labels) {
1253 r = address_label_configure(label, link, NULL, false);
1254 if (r < 0) {
1255 log_link_warning_errno(link, r, "Could not set address label: %m");
1256 link_enter_failed(link);
1257 return r;
1258 }
1259
1260 link->address_label_messages++;
1261 }
1262
1263 /* now that we can figure out a default address for the dhcp server,
1264 start it */
1265 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1266 Address *address;
1267 Link *uplink = NULL;
1268 bool acquired_uplink = false;
1269
1270 address = link_find_dhcp_server_address(link);
1271 if (!address) {
1272 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1273 link_enter_failed(link);
1274 return 0;
1275 }
1276
1277 /* use the server address' subnet as the pool */
1278 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1279 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1280 if (r < 0)
1281 return r;
1282
1283 /* TODO:
1284 r = sd_dhcp_server_set_router(link->dhcp_server,
1285 &main_address->in_addr.in);
1286 if (r < 0)
1287 return r;
1288 */
1289
1290 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1291 r = sd_dhcp_server_set_max_lease_time(
1292 link->dhcp_server,
1293 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1294 if (r < 0)
1295 return r;
1296 }
1297
1298 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1299 r = sd_dhcp_server_set_default_lease_time(
1300 link->dhcp_server,
1301 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1302 if (r < 0)
1303 return r;
1304 }
1305
1306 if (link->network->dhcp_server_emit_dns) {
1307
1308 if (link->network->n_dhcp_server_dns > 0)
1309 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1310 else {
1311 uplink = manager_find_uplink(link->manager, link);
1312 acquired_uplink = true;
1313
1314 if (!uplink) {
1315 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1316 r = 0;
1317 } else
1318 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1319 }
1320 if (r < 0)
1321 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1322 }
1323
1324 if (link->network->dhcp_server_emit_ntp) {
1325
1326 if (link->network->n_dhcp_server_ntp > 0)
1327 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1328 else {
1329 if (!acquired_uplink)
1330 uplink = manager_find_uplink(link->manager, link);
1331
1332 if (!uplink) {
1333 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1334 r = 0;
1335 } else
1336 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1337
1338 }
1339 if (r < 0)
1340 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1341 }
1342
1343 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1344 if (r < 0)
1345 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1346
1347 if (link->network->dhcp_server_emit_timezone) {
1348 _cleanup_free_ char *buffer = NULL;
1349 const char *tz = NULL;
1350
1351 if (link->network->dhcp_server_timezone)
1352 tz = link->network->dhcp_server_timezone;
1353 else {
1354 r = get_timezone(&buffer);
1355 if (r < 0)
1356 log_warning_errno(r, "Failed to determine timezone: %m");
1357 else
1358 tz = buffer;
1359 }
1360
1361 if (tz) {
1362 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1363 if (r < 0)
1364 return r;
1365 }
1366 }
1367 if (!sd_dhcp_server_is_running(link->dhcp_server)) {
1368 r = sd_dhcp_server_start(link->dhcp_server);
1369 if (r < 0) {
1370 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1371
1372 link_enter_failed(link);
1373
1374 return 0;
1375 }
1376 }
1377
1378 log_link_debug(link, "Offering DHCPv4 leases");
1379 }
1380
1381 if (link->address_messages == 0) {
1382 link->addresses_configured = true;
1383 link_check_ready(link);
1384 } else
1385 log_link_debug(link, "Setting addresses");
1386
1387 return 0;
1388 }
1389
1390 static int link_set_bridge_vlan(Link *link) {
1391 int r = 0;
1392
1393 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1394 if (r < 0)
1395 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1396
1397 return r;
1398 }
1399
1400 static int link_set_proxy_arp(Link *link) {
1401 int r;
1402
1403 if (!link_proxy_arp_enabled(link))
1404 return 0;
1405
1406 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1407 if (r < 0)
1408 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1409
1410 return 0;
1411 }
1412
1413 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1414 int r;
1415
1416 assert(link);
1417
1418 log_link_debug(link, "Set link");
1419
1420 r = sd_netlink_message_get_errno(m);
1421 if (r < 0 && r != -EEXIST) {
1422 log_link_error_errno(link, r, "Could not join netdev: %m");
1423 link_enter_failed(link);
1424 }
1425
1426 return 1;
1427 }
1428
1429 static int link_configure_after_setting_mtu(Link *link);
1430
1431 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1432 int r;
1433
1434 assert(m);
1435 assert(link);
1436 assert(link->ifname);
1437
1438 link->setting_mtu = false;
1439
1440 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1441 return 1;
1442
1443 r = sd_netlink_message_get_errno(m);
1444 if (r < 0) {
1445 log_link_warning_errno(link, r, "Could not set MTU: %m");
1446 return 1;
1447 }
1448
1449 log_link_debug(link, "Setting MTU done.");
1450
1451 if (link->state == LINK_STATE_INITIALIZED)
1452 (void) link_configure_after_setting_mtu(link);
1453
1454 return 1;
1455 }
1456
1457 int link_set_mtu(Link *link, uint32_t mtu, bool force) {
1458 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1459 int r;
1460
1461 assert(link);
1462 assert(link->manager);
1463 assert(link->manager->rtnl);
1464
1465 if (mtu == 0 || link->setting_mtu)
1466 return 0;
1467
1468 if (force ? link->mtu == mtu : link->mtu >= mtu)
1469 return 0;
1470
1471 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1472
1473 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1474 if (r < 0)
1475 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1476
1477 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1478 * for this interface, then disable IPv6 else enable it. */
1479 (void) link_enable_ipv6(link);
1480
1481 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1482 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1483 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1484
1485 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1486 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1487
1488 mtu = IPV6_MIN_MTU;
1489 }
1490
1491 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1492 if (r < 0)
1493 return log_link_error_errno(link, r, "Could not append MTU: %m");
1494
1495 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1496 link_netlink_destroy_callback, link);
1497 if (r < 0)
1498 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1499
1500 link_ref(link);
1501 link->setting_mtu = true;
1502
1503 return 0;
1504 }
1505
1506 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1507 int r;
1508
1509 assert(m);
1510 assert(link);
1511 assert(link->ifname);
1512
1513 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1514 return 1;
1515
1516 r = sd_netlink_message_get_errno(m);
1517 if (r < 0)
1518 log_link_warning_errno(link, r, "Could not set link flags: %m");
1519
1520 return 1;
1521 }
1522
1523 static int link_set_flags(Link *link) {
1524 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1525 unsigned ifi_change = 0;
1526 unsigned ifi_flags = 0;
1527 int r;
1528
1529 assert(link);
1530 assert(link->manager);
1531 assert(link->manager->rtnl);
1532
1533 if (link->flags & IFF_LOOPBACK)
1534 return 0;
1535
1536 if (!link->network)
1537 return 0;
1538
1539 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1540 return 0;
1541
1542 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1543 if (r < 0)
1544 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1545
1546 if (link->network->arp >= 0) {
1547 ifi_change |= IFF_NOARP;
1548 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1549 }
1550
1551 if (link->network->multicast >= 0) {
1552 ifi_change |= IFF_MULTICAST;
1553 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1554 }
1555
1556 if (link->network->allmulticast >= 0) {
1557 ifi_change |= IFF_ALLMULTI;
1558 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1559 }
1560
1561 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1562 if (r < 0)
1563 return log_link_error_errno(link, r, "Could not set link flags: %m");
1564
1565 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1566 link_netlink_destroy_callback, link);
1567 if (r < 0)
1568 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1569
1570 link_ref(link);
1571
1572 return 0;
1573 }
1574
1575 static int link_set_bridge(Link *link) {
1576 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1577 int r;
1578
1579 assert(link);
1580 assert(link->network);
1581
1582 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1583 if (r < 0)
1584 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1585
1586 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1587 if (r < 0)
1588 return log_link_error_errno(link, r, "Could not set message family: %m");
1589
1590 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1591 if (r < 0)
1592 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1593
1594 if (link->network->use_bpdu >= 0) {
1595 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
1596 if (r < 0)
1597 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1598 }
1599
1600 if (link->network->hairpin >= 0) {
1601 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1602 if (r < 0)
1603 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1604 }
1605
1606 if (link->network->fast_leave >= 0) {
1607 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1608 if (r < 0)
1609 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1610 }
1611
1612 if (link->network->allow_port_to_be_root >= 0) {
1613 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
1614 if (r < 0)
1615 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1616
1617 }
1618
1619 if (link->network->unicast_flood >= 0) {
1620 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1621 if (r < 0)
1622 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1623 }
1624
1625 if (link->network->multicast_flood >= 0) {
1626 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_FLOOD, link->network->multicast_flood);
1627 if (r < 0)
1628 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_FLOOD attribute: %m");
1629 }
1630
1631 if (link->network->multicast_to_unicast >= 0) {
1632 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_TO_UCAST, link->network->multicast_to_unicast);
1633 if (r < 0)
1634 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_TO_UCAST attribute: %m");
1635 }
1636
1637 if (link->network->neighbor_suppression >= 0) {
1638 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_NEIGH_SUPPRESS, link->network->neighbor_suppression);
1639 if (r < 0)
1640 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_NEIGH_SUPPRESS attribute: %m");
1641 }
1642
1643 if (link->network->learning >= 0) {
1644 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_LEARNING, link->network->learning);
1645 if (r < 0)
1646 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_LEARNING attribute: %m");
1647 }
1648
1649 if (link->network->cost != 0) {
1650 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1651 if (r < 0)
1652 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1653 }
1654
1655 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1656 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1657 if (r < 0)
1658 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1659 }
1660
1661 r = sd_netlink_message_close_container(req);
1662 if (r < 0)
1663 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1664
1665 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_handler,
1666 link_netlink_destroy_callback, link);
1667 if (r < 0)
1668 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1669
1670 link_ref(link);
1671
1672 return r;
1673 }
1674
1675 static int link_set_bond_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1676 int r;
1677
1678 assert(m);
1679 assert(link);
1680 assert(link->ifname);
1681
1682 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1683 return 1;
1684
1685 r = sd_netlink_message_get_errno(m);
1686 if (r < 0) {
1687 log_link_warning_errno(link, r, "Could not set bonding interface: %m");
1688 return 1;
1689 }
1690
1691 return 1;
1692 }
1693
1694 static int link_set_bond(Link *link) {
1695 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1696 int r;
1697
1698 assert(link);
1699 assert(link->network);
1700
1701 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1702 if (r < 0)
1703 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1704
1705 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1706 if (r < 0)
1707 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1708
1709 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1710 if (r < 0)
1711 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1712
1713 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1714 if (r < 0)
1715 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1716
1717 if (link->network->active_slave) {
1718 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1719 if (r < 0)
1720 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1721 }
1722
1723 if (link->network->primary_slave) {
1724 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1725 if (r < 0)
1726 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1727 }
1728
1729 r = sd_netlink_message_close_container(req);
1730 if (r < 0)
1731 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
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_INFO_DATA attribute: %m");
1736
1737 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_bond_handler,
1738 link_netlink_destroy_callback, link);
1739 if (r < 0)
1740 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1741
1742 link_ref(link);
1743
1744 return r;
1745 }
1746
1747 static int link_lldp_save(Link *link) {
1748 _cleanup_free_ char *temp_path = NULL;
1749 _cleanup_fclose_ FILE *f = NULL;
1750 sd_lldp_neighbor **l = NULL;
1751 int n = 0, r, i;
1752
1753 assert(link);
1754 assert(link->lldp_file);
1755
1756 if (!link->lldp) {
1757 (void) unlink(link->lldp_file);
1758 return 0;
1759 }
1760
1761 r = sd_lldp_get_neighbors(link->lldp, &l);
1762 if (r < 0)
1763 goto finish;
1764 if (r == 0) {
1765 (void) unlink(link->lldp_file);
1766 goto finish;
1767 }
1768
1769 n = r;
1770
1771 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1772 if (r < 0)
1773 goto finish;
1774
1775 fchmod(fileno(f), 0644);
1776
1777 for (i = 0; i < n; i++) {
1778 const void *p;
1779 le64_t u;
1780 size_t sz;
1781
1782 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1783 if (r < 0)
1784 goto finish;
1785
1786 u = htole64(sz);
1787 (void) fwrite(&u, 1, sizeof(u), f);
1788 (void) fwrite(p, 1, sz, f);
1789 }
1790
1791 r = fflush_and_check(f);
1792 if (r < 0)
1793 goto finish;
1794
1795 if (rename(temp_path, link->lldp_file) < 0) {
1796 r = -errno;
1797 goto finish;
1798 }
1799
1800 finish:
1801 if (r < 0) {
1802 (void) unlink(link->lldp_file);
1803 if (temp_path)
1804 (void) unlink(temp_path);
1805
1806 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1807 }
1808
1809 if (l) {
1810 for (i = 0; i < n; i++)
1811 sd_lldp_neighbor_unref(l[i]);
1812 free(l);
1813 }
1814
1815 return r;
1816 }
1817
1818 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1819 Link *link = userdata;
1820 int r;
1821
1822 assert(link);
1823
1824 (void) link_lldp_save(link);
1825
1826 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1827 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1828
1829 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1830
1831 r = link_lldp_emit_start(link);
1832 if (r < 0)
1833 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1834 }
1835 }
1836
1837 static int link_acquire_ipv6_conf(Link *link) {
1838 int r;
1839
1840 assert(link);
1841
1842 if (link_ipv6_accept_ra_enabled(link)) {
1843 assert(link->ndisc);
1844
1845 log_link_debug(link, "Discovering IPv6 routers");
1846
1847 r = sd_ndisc_start(link->ndisc);
1848 if (r < 0 && r != -EBUSY)
1849 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1850 }
1851
1852 if (link_radv_enabled(link)) {
1853 assert(link->radv);
1854 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1855
1856 log_link_debug(link, "Starting IPv6 Router Advertisements");
1857
1858 r = sd_radv_start(link->radv);
1859 if (r < 0 && r != -EBUSY)
1860 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1861 }
1862
1863 (void) dhcp6_request_prefix_delegation(link);
1864
1865 return 0;
1866 }
1867
1868 static int link_acquire_ipv4_conf(Link *link) {
1869 int r;
1870
1871 assert(link);
1872 assert(link->manager);
1873 assert(link->manager->event);
1874
1875 if (link_ipv4ll_enabled(link)) {
1876 assert(link->ipv4ll);
1877
1878 log_link_debug(link, "Acquiring IPv4 link-local address");
1879
1880 r = sd_ipv4ll_start(link->ipv4ll);
1881 if (r < 0)
1882 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1883 }
1884
1885 if (link_dhcp4_enabled(link)) {
1886 assert(link->dhcp_client);
1887
1888 log_link_debug(link, "Acquiring DHCPv4 lease");
1889
1890 r = sd_dhcp_client_start(link->dhcp_client);
1891 if (r < 0)
1892 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1893 }
1894
1895 return 0;
1896 }
1897
1898 static int link_acquire_conf(Link *link) {
1899 int r;
1900
1901 assert(link);
1902
1903 r = link_acquire_ipv4_conf(link);
1904 if (r < 0)
1905 return r;
1906
1907 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1908 r = link_acquire_ipv6_conf(link);
1909 if (r < 0)
1910 return r;
1911 }
1912
1913 if (link_lldp_emit_enabled(link)) {
1914 r = link_lldp_emit_start(link);
1915 if (r < 0)
1916 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1917 }
1918
1919 return 0;
1920 }
1921
1922 bool link_has_carrier(Link *link) {
1923 /* see Documentation/networking/operstates.txt in the kernel sources */
1924
1925 if (link->kernel_operstate == IF_OPER_UP)
1926 return true;
1927
1928 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1929 /* operstate may not be implemented, so fall back to flags */
1930 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1931 return true;
1932
1933 return false;
1934 }
1935
1936 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1937 int r;
1938
1939 assert(link);
1940
1941 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1942 return 1;
1943
1944 r = sd_netlink_message_get_errno(m);
1945 if (r < 0)
1946 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1947
1948 return 1;
1949 }
1950
1951 static int link_configure_addrgen_mode(Link *link) {
1952 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1953 uint8_t ipv6ll_mode;
1954 int r;
1955
1956 assert(link);
1957 assert(link->network);
1958 assert(link->manager);
1959 assert(link->manager->rtnl);
1960
1961 log_link_debug(link, "Setting address genmode for link");
1962
1963 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1964 if (r < 0)
1965 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1966
1967 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1968 if (r < 0)
1969 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1970
1971 r = sd_netlink_message_open_container(req, AF_INET6);
1972 if (r < 0)
1973 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1974
1975 if (!link_ipv6ll_enabled(link))
1976 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1977 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1978 /* The file may not exist. And event if it exists, when stable_secret is unset,
1979 * reading the file fails with EIO. */
1980 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1981 else
1982 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1983
1984 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1985 if (r < 0)
1986 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1987
1988 r = sd_netlink_message_close_container(req);
1989 if (r < 0)
1990 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1991
1992 r = sd_netlink_message_close_container(req);
1993 if (r < 0)
1994 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1995
1996 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1997 link_netlink_destroy_callback, link);
1998 if (r < 0)
1999 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2000
2001 link_ref(link);
2002
2003 return 0;
2004 }
2005
2006 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2007 int r;
2008
2009 assert(link);
2010
2011 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2012 return 1;
2013
2014 r = sd_netlink_message_get_errno(m);
2015 if (r < 0)
2016 /* we warn but don't fail the link, as it may be brought up later */
2017 log_link_warning_errno(link, r, "Could not bring up interface: %m");
2018
2019 return 1;
2020 }
2021
2022 static int link_up(Link *link) {
2023 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2024 int r;
2025
2026 assert(link);
2027 assert(link->network);
2028 assert(link->manager);
2029 assert(link->manager->rtnl);
2030
2031 log_link_debug(link, "Bringing link up");
2032
2033 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2034 if (r < 0)
2035 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2036
2037 /* set it free if not enslaved with networkd */
2038 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
2039 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
2040 if (r < 0)
2041 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
2042 }
2043
2044 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
2045 if (r < 0)
2046 return log_link_error_errno(link, r, "Could not set link flags: %m");
2047
2048 if (link->network->mac) {
2049 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
2050 if (r < 0)
2051 return log_link_error_errno(link, r, "Could not set MAC address: %m");
2052 }
2053
2054 if (link_ipv6_enabled(link)) {
2055 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
2056 if (r < 0)
2057 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
2058
2059 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
2060 r = sd_netlink_message_open_container(req, AF_INET6);
2061 if (r < 0)
2062 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
2063
2064 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
2065 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
2066 if (r < 0)
2067 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
2068 }
2069
2070 r = sd_netlink_message_close_container(req);
2071 if (r < 0)
2072 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
2073
2074 r = sd_netlink_message_close_container(req);
2075 if (r < 0)
2076 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
2077 }
2078
2079 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2080 link_netlink_destroy_callback, link);
2081 if (r < 0)
2082 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2083
2084 link_ref(link);
2085
2086 return 0;
2087 }
2088
2089 static int link_up_can(Link *link) {
2090 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2091 int r;
2092
2093 assert(link);
2094
2095 log_link_debug(link, "Bringing CAN link up");
2096
2097 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2098 if (r < 0)
2099 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2100
2101 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
2102 if (r < 0)
2103 return log_link_error_errno(link, r, "Could not set link flags: %m");
2104
2105 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2106 link_netlink_destroy_callback, link);
2107 if (r < 0)
2108 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2109
2110 link_ref(link);
2111
2112 return 0;
2113 }
2114
2115 static int link_set_can(Link *link) {
2116 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
2117 int r;
2118
2119 assert(link);
2120 assert(link->network);
2121 assert(link->manager);
2122 assert(link->manager->rtnl);
2123
2124 log_link_debug(link, "link_set_can");
2125
2126 r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
2127 if (r < 0)
2128 return log_link_error_errno(link, r, "Failed to allocate netlink message: %m");
2129
2130 r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
2131 if (r < 0)
2132 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
2133
2134 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
2135 if (r < 0)
2136 return log_link_error_errno(link, r, "Failed to open netlink container: %m");
2137
2138 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
2139 if (r < 0)
2140 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
2141
2142 if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) {
2143 struct can_bittiming bt = {
2144 .bitrate = link->network->can_bitrate,
2145 .sample_point = link->network->can_sample_point,
2146 };
2147
2148 if (link->network->can_bitrate > UINT32_MAX) {
2149 log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate);
2150 return -ERANGE;
2151 }
2152
2153 log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate);
2154 if (link->network->can_sample_point > 0)
2155 log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
2156 else
2157 log_link_debug(link, "Using default sample point");
2158
2159 r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
2160 if (r < 0)
2161 return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
2162 }
2163
2164 if (link->network->can_restart_us > 0) {
2165 char time_string[FORMAT_TIMESPAN_MAX];
2166 uint64_t restart_ms;
2167
2168 if (link->network->can_restart_us == USEC_INFINITY)
2169 restart_ms = 0;
2170 else
2171 restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC);
2172
2173 format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC);
2174
2175 if (restart_ms > UINT32_MAX) {
2176 log_link_error(link, "restart timeout (%s) too big.", time_string);
2177 return -ERANGE;
2178 }
2179
2180 log_link_debug(link, "Setting restart = %s", time_string);
2181
2182 r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
2183 if (r < 0)
2184 return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
2185 }
2186
2187 if (link->network->can_triple_sampling >= 0) {
2188 struct can_ctrlmode cm = {
2189 .mask = CAN_CTRLMODE_3_SAMPLES,
2190 .flags = link->network->can_triple_sampling ? CAN_CTRLMODE_3_SAMPLES : 0,
2191 };
2192
2193 log_link_debug(link, "%sabling triple-sampling", link->network->can_triple_sampling ? "En" : "Dis");
2194
2195 r = sd_netlink_message_append_data(m, IFLA_CAN_CTRLMODE, &cm, sizeof(cm));
2196 if (r < 0)
2197 return log_link_error_errno(link, r, "Could not append IFLA_CAN_CTRLMODE attribute: %m");
2198 }
2199
2200 r = sd_netlink_message_close_container(m);
2201 if (r < 0)
2202 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2203
2204 r = sd_netlink_message_close_container(m);
2205 if (r < 0)
2206 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2207
2208 r = netlink_call_async(link->manager->rtnl, NULL, m, link_set_handler,
2209 link_netlink_destroy_callback, link);
2210 if (r < 0)
2211 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2212
2213 link_ref(link);
2214
2215 if (!(link->flags & IFF_UP)) {
2216 r = link_up_can(link);
2217 if (r < 0) {
2218 link_enter_failed(link);
2219 return r;
2220 }
2221 }
2222
2223 log_link_debug(link, "link_set_can done");
2224
2225 return r;
2226 }
2227
2228 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2229 int r;
2230
2231 assert(link);
2232
2233 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2234 return 1;
2235
2236 r = sd_netlink_message_get_errno(m);
2237 if (r < 0)
2238 log_link_warning_errno(link, r, "Could not bring down interface: %m");
2239
2240 if (streq_ptr(link->kind, "can"))
2241 link_set_can(link);
2242
2243 return 1;
2244 }
2245
2246 int link_down(Link *link) {
2247 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2248 int r;
2249
2250 assert(link);
2251 assert(link->manager);
2252 assert(link->manager->rtnl);
2253
2254 log_link_debug(link, "Bringing link down");
2255
2256 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
2257 RTM_SETLINK, link->ifindex);
2258 if (r < 0)
2259 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2260
2261 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
2262 if (r < 0)
2263 return log_link_error_errno(link, r, "Could not set link flags: %m");
2264
2265 r = netlink_call_async(link->manager->rtnl, NULL, req, link_down_handler,
2266 link_netlink_destroy_callback, link);
2267 if (r < 0)
2268 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2269
2270 link_ref(link);
2271
2272 return 0;
2273 }
2274
2275 static int link_handle_bound_to_list(Link *link) {
2276 Link *l;
2277 Iterator i;
2278 int r;
2279 bool required_up = false;
2280 bool link_is_up = false;
2281
2282 assert(link);
2283
2284 if (hashmap_isempty(link->bound_to_links))
2285 return 0;
2286
2287 if (link->flags & IFF_UP)
2288 link_is_up = true;
2289
2290 HASHMAP_FOREACH (l, link->bound_to_links, i)
2291 if (link_has_carrier(l)) {
2292 required_up = true;
2293 break;
2294 }
2295
2296 if (!required_up && link_is_up) {
2297 r = link_down(link);
2298 if (r < 0)
2299 return r;
2300 } else if (required_up && !link_is_up) {
2301 r = link_up(link);
2302 if (r < 0)
2303 return r;
2304 }
2305
2306 return 0;
2307 }
2308
2309 static int link_handle_bound_by_list(Link *link) {
2310 Iterator i;
2311 Link *l;
2312 int r;
2313
2314 assert(link);
2315
2316 if (hashmap_isempty(link->bound_by_links))
2317 return 0;
2318
2319 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2320 r = link_handle_bound_to_list(l);
2321 if (r < 0)
2322 return r;
2323 }
2324
2325 return 0;
2326 }
2327
2328 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2329 int r;
2330
2331 assert(link);
2332 assert(carrier);
2333
2334 if (link == carrier)
2335 return 0;
2336
2337 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2338 return 0;
2339
2340 r = hashmap_ensure_allocated(h, NULL);
2341 if (r < 0)
2342 return r;
2343
2344 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2345 if (r < 0)
2346 return r;
2347
2348 return 0;
2349 }
2350
2351 static int link_new_bound_by_list(Link *link) {
2352 Manager *m;
2353 Link *carrier;
2354 Iterator i;
2355 int r;
2356 bool list_updated = false;
2357
2358 assert(link);
2359 assert(link->manager);
2360
2361 m = link->manager;
2362
2363 HASHMAP_FOREACH(carrier, m->links, i) {
2364 if (!carrier->network)
2365 continue;
2366
2367 if (strv_isempty(carrier->network->bind_carrier))
2368 continue;
2369
2370 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2371 r = link_put_carrier(link, carrier, &link->bound_by_links);
2372 if (r < 0)
2373 return r;
2374
2375 list_updated = true;
2376 }
2377 }
2378
2379 if (list_updated)
2380 link_dirty(link);
2381
2382 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2383 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2384 if (r < 0)
2385 return r;
2386
2387 link_dirty(carrier);
2388 }
2389
2390 return 0;
2391 }
2392
2393 static int link_new_bound_to_list(Link *link) {
2394 Manager *m;
2395 Link *carrier;
2396 Iterator i;
2397 int r;
2398 bool list_updated = false;
2399
2400 assert(link);
2401 assert(link->manager);
2402
2403 if (!link->network)
2404 return 0;
2405
2406 if (strv_isempty(link->network->bind_carrier))
2407 return 0;
2408
2409 m = link->manager;
2410
2411 HASHMAP_FOREACH (carrier, m->links, i) {
2412 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2413 r = link_put_carrier(link, carrier, &link->bound_to_links);
2414 if (r < 0)
2415 return r;
2416
2417 list_updated = true;
2418 }
2419 }
2420
2421 if (list_updated)
2422 link_dirty(link);
2423
2424 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2425 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2426 if (r < 0)
2427 return r;
2428
2429 link_dirty(carrier);
2430 }
2431
2432 return 0;
2433 }
2434
2435 static int link_new_carrier_maps(Link *link) {
2436 int r;
2437
2438 r = link_new_bound_by_list(link);
2439 if (r < 0)
2440 return r;
2441
2442 r = link_handle_bound_by_list(link);
2443 if (r < 0)
2444 return r;
2445
2446 r = link_new_bound_to_list(link);
2447 if (r < 0)
2448 return r;
2449
2450 r = link_handle_bound_to_list(link);
2451 if (r < 0)
2452 return r;
2453
2454 return 0;
2455 }
2456
2457 static void link_free_bound_to_list(Link *link) {
2458 Link *bound_to;
2459 Iterator i;
2460
2461 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2462 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2463
2464 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2465 link_dirty(bound_to);
2466 }
2467
2468 return;
2469 }
2470
2471 static void link_free_bound_by_list(Link *link) {
2472 Link *bound_by;
2473 Iterator i;
2474
2475 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2476 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2477
2478 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2479 link_dirty(bound_by);
2480 link_handle_bound_to_list(bound_by);
2481 }
2482 }
2483
2484 return;
2485 }
2486
2487 static void link_free_carrier_maps(Link *link) {
2488 bool list_updated = false;
2489
2490 assert(link);
2491
2492 if (!hashmap_isempty(link->bound_to_links)) {
2493 link_free_bound_to_list(link);
2494 list_updated = true;
2495 }
2496
2497 if (!hashmap_isempty(link->bound_by_links)) {
2498 link_free_bound_by_list(link);
2499 list_updated = true;
2500 }
2501
2502 if (list_updated)
2503 link_dirty(link);
2504
2505 return;
2506 }
2507
2508 static int link_append_to_master(Link *link, NetDev *netdev) {
2509 Link *master;
2510 int r;
2511
2512 assert(link);
2513 assert(netdev);
2514
2515 r = link_get(link->manager, netdev->ifindex, &master);
2516 if (r < 0)
2517 return r;
2518
2519 r = set_ensure_allocated(&master->slaves, NULL);
2520 if (r < 0)
2521 return r;
2522
2523 r = set_put(master->slaves, link);
2524 if (r < 0)
2525 return r;
2526
2527 link_ref(link);
2528 return 0;
2529 }
2530
2531 static void link_drop_from_master(Link *link, NetDev *netdev) {
2532 Link *master;
2533
2534 assert(link);
2535
2536 if (!link->manager || !netdev)
2537 return;
2538
2539 if (link_get(link->manager, netdev->ifindex, &master) < 0)
2540 return;
2541
2542 link_unref(set_remove(master->slaves, link));
2543 }
2544
2545 static void link_detach_from_manager(Link *link) {
2546 if (!link || !link->manager)
2547 return;
2548
2549 link_unref(set_remove(link->manager->links_requesting_uuid, link));
2550 link_clean(link);
2551
2552 /* The following must be called at last. */
2553 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2554 link_unref(link);
2555 }
2556
2557 void link_drop(Link *link) {
2558 if (!link || link->state == LINK_STATE_LINGER)
2559 return;
2560
2561 link_set_state(link, LINK_STATE_LINGER);
2562
2563 link_free_carrier_maps(link);
2564
2565 if (link->network) {
2566 link_drop_from_master(link, link->network->bridge);
2567 link_drop_from_master(link, link->network->bond);
2568 }
2569
2570 log_link_debug(link, "Link removed");
2571
2572 (void) unlink(link->state_file);
2573 link_detach_from_manager(link);
2574 }
2575
2576 static int link_joined(Link *link) {
2577 int r;
2578
2579 assert(link);
2580 assert(link->network);
2581
2582 if (!hashmap_isempty(link->bound_to_links)) {
2583 r = link_handle_bound_to_list(link);
2584 if (r < 0)
2585 return r;
2586 } else if (!(link->flags & IFF_UP)) {
2587 r = link_up(link);
2588 if (r < 0) {
2589 link_enter_failed(link);
2590 return r;
2591 }
2592 }
2593
2594 if (link->network->bridge) {
2595 r = link_set_bridge(link);
2596 if (r < 0)
2597 log_link_error_errno(link, r, "Could not set bridge message: %m");
2598
2599 r = link_append_to_master(link, link->network->bridge);
2600 if (r < 0)
2601 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2602 }
2603
2604 if (link->network->bond) {
2605 r = link_set_bond(link);
2606 if (r < 0)
2607 log_link_error_errno(link, r, "Could not set bond message: %m");
2608
2609 r = link_append_to_master(link, link->network->bond);
2610 if (r < 0)
2611 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2612 }
2613
2614 if (link->network->use_br_vlan &&
2615 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2616 r = link_set_bridge_vlan(link);
2617 if (r < 0)
2618 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2619 }
2620
2621 /* Skip setting up addresses until it gets carrier,
2622 or it would try to set addresses twice,
2623 which is bad for non-idempotent steps. */
2624 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2625 return 0;
2626
2627 return link_request_set_addresses(link);
2628 }
2629
2630 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2631 int r;
2632
2633 assert(link);
2634 assert(link->network);
2635 assert(link->enslaving > 0);
2636 assert(!link->enslaved_raw);
2637
2638 link->enslaving--;
2639
2640 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2641 return 1;
2642
2643 r = sd_netlink_message_get_errno(m);
2644 if (r < 0 && r != -EEXIST) {
2645 log_link_error_errno(link, r, "Could not join netdev: %m");
2646 link_enter_failed(link);
2647 return 1;
2648 } else
2649 log_link_debug(link, "Joined netdev");
2650
2651 if (link->enslaving == 0) {
2652 link->enslaved_raw = true;
2653 link_joined(link);
2654 }
2655
2656 return 1;
2657 }
2658
2659 static int link_enter_join_netdev(Link *link) {
2660 NetDev *netdev;
2661 Iterator i;
2662 int r;
2663
2664 assert(link);
2665 assert(link->network);
2666 assert(link->state == LINK_STATE_INITIALIZED);
2667
2668 link_set_state(link, LINK_STATE_CONFIGURING);
2669
2670 link_dirty(link);
2671 link->enslaving = 0;
2672 link->enslaved_raw = false;
2673
2674 if (link->network->bond) {
2675 if (link->network->bond->state == NETDEV_STATE_READY &&
2676 link->network->bond->ifindex == link->master_ifindex)
2677 return link_joined(link);
2678
2679 log_struct(LOG_DEBUG,
2680 LOG_LINK_INTERFACE(link),
2681 LOG_NETDEV_INTERFACE(link->network->bond),
2682 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2683
2684 link->enslaving++;
2685
2686 r = netdev_join(link->network->bond, link, netdev_join_handler);
2687 if (r < 0) {
2688 log_struct_errno(LOG_WARNING, r,
2689 LOG_LINK_INTERFACE(link),
2690 LOG_NETDEV_INTERFACE(link->network->bond),
2691 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2692 link_enter_failed(link);
2693 return r;
2694 }
2695 }
2696
2697 if (link->network->bridge) {
2698 log_struct(LOG_DEBUG,
2699 LOG_LINK_INTERFACE(link),
2700 LOG_NETDEV_INTERFACE(link->network->bridge),
2701 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2702
2703 link->enslaving++;
2704
2705 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2706 if (r < 0) {
2707 log_struct_errno(LOG_WARNING, r,
2708 LOG_LINK_INTERFACE(link),
2709 LOG_NETDEV_INTERFACE(link->network->bridge),
2710 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2711 link_enter_failed(link);
2712 return r;
2713 }
2714 }
2715
2716 if (link->network->vrf) {
2717 log_struct(LOG_DEBUG,
2718 LOG_LINK_INTERFACE(link),
2719 LOG_NETDEV_INTERFACE(link->network->vrf),
2720 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2721
2722 link->enslaving++;
2723
2724 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2725 if (r < 0) {
2726 log_struct_errno(LOG_WARNING, r,
2727 LOG_LINK_INTERFACE(link),
2728 LOG_NETDEV_INTERFACE(link->network->vrf),
2729 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2730 link_enter_failed(link);
2731 return r;
2732 }
2733 }
2734
2735 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2736
2737 if (netdev->ifindex > 0)
2738 /* Assume already enslaved. */
2739 continue;
2740
2741 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2742 continue;
2743
2744 log_struct(LOG_DEBUG,
2745 LOG_LINK_INTERFACE(link),
2746 LOG_NETDEV_INTERFACE(netdev),
2747 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2748
2749 link->enslaving++;
2750
2751 r = netdev_join(netdev, link, netdev_join_handler);
2752 if (r < 0) {
2753 log_struct_errno(LOG_WARNING, r,
2754 LOG_LINK_INTERFACE(link),
2755 LOG_NETDEV_INTERFACE(netdev),
2756 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2757 link_enter_failed(link);
2758 return r;
2759 }
2760 }
2761
2762 if (link->enslaving == 0)
2763 return link_joined(link);
2764
2765 return 0;
2766 }
2767
2768 static int link_set_ipv4_forward(Link *link) {
2769 int r;
2770
2771 if (!link_ipv4_forward_enabled(link))
2772 return 0;
2773
2774 /* We propagate the forwarding flag from one interface to the
2775 * global setting one way. This means: as long as at least one
2776 * interface was configured at any time that had IP forwarding
2777 * enabled the setting will stay on for good. We do this
2778 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2779 * somewhat in sync (see below). */
2780
2781 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2782 if (r < 0)
2783 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2784
2785 return 0;
2786 }
2787
2788 static int link_set_ipv6_forward(Link *link) {
2789 int r;
2790
2791 if (!link_ipv6_forward_enabled(link))
2792 return 0;
2793
2794 /* On Linux, the IPv6 stack does not know a per-interface
2795 * packet forwarding setting: either packet forwarding is on
2796 * for all, or off for all. We hence don't bother with a
2797 * per-interface setting, but simply propagate the interface
2798 * flag, if it is set, to the global flag, one-way. Note that
2799 * while IPv4 would allow a per-interface flag, we expose the
2800 * same behaviour there and also propagate the setting from
2801 * one to all, to keep things simple (see above). */
2802
2803 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2804 if (r < 0)
2805 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2806
2807 return 0;
2808 }
2809
2810 static int link_set_ipv6_privacy_extensions(Link *link) {
2811 IPv6PrivacyExtensions s;
2812 int r;
2813
2814 s = link_ipv6_privacy_extensions(link);
2815 if (s < 0)
2816 return 0;
2817
2818 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2819 if (r < 0)
2820 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2821
2822 return 0;
2823 }
2824
2825 static int link_set_ipv6_accept_ra(Link *link) {
2826 int r;
2827
2828 /* Make this a NOP if IPv6 is not available */
2829 if (!socket_ipv6_is_supported())
2830 return 0;
2831
2832 if (link->flags & IFF_LOOPBACK)
2833 return 0;
2834
2835 if (!link->network)
2836 return 0;
2837
2838 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2839 if (r < 0)
2840 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2841
2842 return 0;
2843 }
2844
2845 static int link_set_ipv6_dad_transmits(Link *link) {
2846 int r;
2847
2848 /* Make this a NOP if IPv6 is not available */
2849 if (!socket_ipv6_is_supported())
2850 return 0;
2851
2852 if (link->flags & IFF_LOOPBACK)
2853 return 0;
2854
2855 if (!link->network)
2856 return 0;
2857
2858 if (link->network->ipv6_dad_transmits < 0)
2859 return 0;
2860
2861 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2862 if (r < 0)
2863 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2864
2865 return 0;
2866 }
2867
2868 static int link_set_ipv6_hop_limit(Link *link) {
2869 int r;
2870
2871 /* Make this a NOP if IPv6 is not available */
2872 if (!socket_ipv6_is_supported())
2873 return 0;
2874
2875 if (link->flags & IFF_LOOPBACK)
2876 return 0;
2877
2878 if (!link->network)
2879 return 0;
2880
2881 if (link->network->ipv6_hop_limit < 0)
2882 return 0;
2883
2884 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2885 if (r < 0)
2886 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2887
2888 return 0;
2889 }
2890
2891 static int link_set_ipv6_mtu(Link *link) {
2892 int r;
2893
2894 /* Make this a NOP if IPv6 is not available */
2895 if (!socket_ipv6_is_supported())
2896 return 0;
2897
2898 if (link->flags & IFF_LOOPBACK)
2899 return 0;
2900
2901 if (link->network->ipv6_mtu == 0)
2902 return 0;
2903
2904 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2905 if (r < 0)
2906 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2907
2908 return 0;
2909 }
2910
2911 static bool link_is_static_address_configured(Link *link, Address *address) {
2912 Address *net_address;
2913
2914 assert(link);
2915 assert(address);
2916
2917 if (!link->network)
2918 return false;
2919
2920 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2921 if (address_equal(net_address, address))
2922 return true;
2923
2924 return false;
2925 }
2926
2927 static bool link_is_static_route_configured(Link *link, Route *route) {
2928 Route *net_route;
2929
2930 assert(link);
2931 assert(route);
2932
2933 if (!link->network)
2934 return false;
2935
2936 LIST_FOREACH(routes, net_route, link->network->static_routes)
2937 if (route_equal(net_route, route))
2938 return true;
2939
2940 return false;
2941 }
2942
2943 static int link_drop_foreign_config(Link *link) {
2944 Address *address;
2945 Route *route;
2946 Iterator i;
2947 int r;
2948
2949 SET_FOREACH(address, link->addresses_foreign, i) {
2950 /* we consider IPv6LL addresses to be managed by the kernel */
2951 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2952 continue;
2953
2954 if (link_is_static_address_configured(link, address)) {
2955 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2956 if (r < 0)
2957 return log_link_error_errno(link, r, "Failed to add address: %m");
2958 } else {
2959 r = address_remove(address, link, NULL);
2960 if (r < 0)
2961 return r;
2962 }
2963 }
2964
2965 SET_FOREACH(route, link->routes_foreign, i) {
2966 /* do not touch routes managed by the kernel */
2967 if (route->protocol == RTPROT_KERNEL)
2968 continue;
2969
2970 if (link_is_static_route_configured(link, route)) {
2971 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2972 if (r < 0)
2973 return r;
2974 } else {
2975 r = route_remove(route, link, NULL);
2976 if (r < 0)
2977 return r;
2978 }
2979 }
2980
2981 return 0;
2982 }
2983
2984 static int link_drop_config(Link *link) {
2985 Address *address, *pool_address;
2986 Route *route;
2987 Iterator i;
2988 int r;
2989
2990 SET_FOREACH(address, link->addresses, i) {
2991 /* we consider IPv6LL addresses to be managed by the kernel */
2992 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2993 continue;
2994
2995 r = address_remove(address, link, NULL);
2996 if (r < 0)
2997 return r;
2998
2999 /* If this address came from an address pool, clean up the pool */
3000 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
3001 if (address_equal(address, pool_address)) {
3002 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
3003 address_free(pool_address);
3004 break;
3005 }
3006 }
3007 }
3008
3009 SET_FOREACH(route, link->routes, i) {
3010 /* do not touch routes managed by the kernel */
3011 if (route->protocol == RTPROT_KERNEL)
3012 continue;
3013
3014 r = route_remove(route, link, NULL);
3015 if (r < 0)
3016 return r;
3017 }
3018
3019 ndisc_flush(link);
3020
3021 return 0;
3022 }
3023
3024 static int link_update_lldp(Link *link) {
3025 int r;
3026
3027 assert(link);
3028
3029 if (!link->lldp)
3030 return 0;
3031
3032 if (link->flags & IFF_UP) {
3033 r = sd_lldp_start(link->lldp);
3034 if (r > 0)
3035 log_link_debug(link, "Started LLDP.");
3036 } else {
3037 r = sd_lldp_stop(link->lldp);
3038 if (r > 0)
3039 log_link_debug(link, "Stopped LLDP.");
3040 }
3041
3042 return r;
3043 }
3044
3045 static int link_configure_can(Link *link) {
3046 int r;
3047
3048 if (streq_ptr(link->kind, "can")) {
3049 /* The CAN interface must be down to configure bitrate, etc... */
3050 if ((link->flags & IFF_UP)) {
3051 r = link_down(link);
3052 if (r < 0) {
3053 link_enter_failed(link);
3054 return r;
3055 }
3056
3057 return 0;
3058 }
3059
3060 return link_set_can(link);
3061 }
3062
3063 if (!(link->flags & IFF_UP)) {
3064 r = link_up_can(link);
3065 if (r < 0) {
3066 link_enter_failed(link);
3067 return r;
3068 }
3069 }
3070
3071 return 0;
3072 }
3073
3074 static int link_configure(Link *link) {
3075 int r;
3076
3077 assert(link);
3078 assert(link->network);
3079 assert(link->state == LINK_STATE_INITIALIZED);
3080
3081 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
3082 return link_configure_can(link);
3083
3084 /* Drop foreign config, but ignore loopback or critical devices.
3085 * We do not want to remove loopback address or addresses used for root NFS. */
3086 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
3087 r = link_drop_foreign_config(link);
3088 if (r < 0)
3089 return r;
3090 }
3091
3092 r = link_set_proxy_arp(link);
3093 if (r < 0)
3094 return r;
3095
3096 r = ipv6_proxy_ndp_addresses_configure(link);
3097 if (r < 0)
3098 return r;
3099
3100 r = link_set_ipv4_forward(link);
3101 if (r < 0)
3102 return r;
3103
3104 r = link_set_ipv6_forward(link);
3105 if (r < 0)
3106 return r;
3107
3108 r = link_set_ipv6_privacy_extensions(link);
3109 if (r < 0)
3110 return r;
3111
3112 r = link_set_ipv6_accept_ra(link);
3113 if (r < 0)
3114 return r;
3115
3116 r = link_set_ipv6_dad_transmits(link);
3117 if (r < 0)
3118 return r;
3119
3120 r = link_set_ipv6_hop_limit(link);
3121 if (r < 0)
3122 return r;
3123
3124 r = link_set_flags(link);
3125 if (r < 0)
3126 return r;
3127
3128 r = link_set_ipv6_mtu(link);
3129 if (r < 0)
3130 return r;
3131
3132 if (link_ipv4ll_enabled(link) || link_ipv4ll_fallback_enabled(link)) {
3133 r = ipv4ll_configure(link);
3134 if (r < 0)
3135 return r;
3136 }
3137
3138 if (link_dhcp4_enabled(link)) {
3139 r = dhcp4_set_promote_secondaries(link);
3140 if (r < 0)
3141 return r;
3142
3143 r = dhcp4_configure(link);
3144 if (r < 0)
3145 return r;
3146 }
3147
3148 if (link_dhcp4_server_enabled(link)) {
3149 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
3150 if (r < 0)
3151 return r;
3152
3153 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
3154 if (r < 0)
3155 return r;
3156 }
3157
3158 if (link_dhcp6_enabled(link) ||
3159 link_ipv6_accept_ra_enabled(link)) {
3160 r = dhcp6_configure(link);
3161 if (r < 0)
3162 return r;
3163 }
3164
3165 if (link_ipv6_accept_ra_enabled(link)) {
3166 r = ndisc_configure(link);
3167 if (r < 0)
3168 return r;
3169 }
3170
3171 if (link_radv_enabled(link)) {
3172 r = radv_configure(link);
3173 if (r < 0)
3174 return r;
3175 }
3176
3177 if (link_lldp_rx_enabled(link)) {
3178 r = sd_lldp_new(&link->lldp);
3179 if (r < 0)
3180 return r;
3181
3182 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
3183 if (r < 0)
3184 return r;
3185
3186 r = sd_lldp_match_capabilities(link->lldp,
3187 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
3188 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
3189 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
3190 if (r < 0)
3191 return r;
3192
3193 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
3194 if (r < 0)
3195 return r;
3196
3197 r = sd_lldp_attach_event(link->lldp, NULL, 0);
3198 if (r < 0)
3199 return r;
3200
3201 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
3202 if (r < 0)
3203 return r;
3204
3205 r = link_update_lldp(link);
3206 if (r < 0)
3207 return r;
3208 }
3209
3210 r = link_set_mtu(link, link->network->mtu, link->network->mtu_is_set);
3211 if (r < 0)
3212 return r;
3213
3214 if (socket_ipv6_is_supported()) {
3215 r = link_configure_addrgen_mode(link);
3216 if (r < 0)
3217 return r;
3218 }
3219
3220 return link_configure_after_setting_mtu(link);
3221 }
3222
3223 static int link_configure_after_setting_mtu(Link *link) {
3224 int r;
3225
3226 assert(link);
3227 assert(link->network);
3228 assert(link->state == LINK_STATE_INITIALIZED);
3229
3230 if (link->setting_mtu)
3231 return 0;
3232
3233 if (link_has_carrier(link) || link->network->configure_without_carrier) {
3234 r = link_acquire_conf(link);
3235 if (r < 0)
3236 return r;
3237 }
3238
3239 return link_enter_join_netdev(link);
3240 }
3241
3242 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3243 assert(duid);
3244
3245 if (duid->raw_data_len > 0)
3246 return 0;
3247
3248 if (duid->type != DUID_TYPE_UUID)
3249 return -EINVAL;
3250
3251 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3252 duid->raw_data_len = sizeof(sd_id128_t);
3253
3254 return 1;
3255 }
3256
3257 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3258 Manager *manager = userdata;
3259 const sd_bus_error *e;
3260 const void *a;
3261 size_t sz;
3262 DUID *duid;
3263 Link *link;
3264 int r;
3265
3266 assert(m);
3267 assert(manager);
3268
3269 e = sd_bus_message_get_error(m);
3270 if (e) {
3271 log_error_errno(sd_bus_error_get_errno(e),
3272 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3273 e->message);
3274 goto configure;
3275 }
3276
3277 r = sd_bus_message_read_array(m, 'y', &a, &sz);
3278 if (r < 0)
3279 goto configure;
3280
3281 if (sz != sizeof(sd_id128_t)) {
3282 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3283 goto configure;
3284 }
3285
3286 memcpy(&manager->product_uuid, a, sz);
3287 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3288 (void) duid_set_uuid(duid, manager->product_uuid);
3289
3290 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3291
3292 configure:
3293 while ((link = set_steal_first(manager->links_requesting_uuid))) {
3294 r = link_configure(link);
3295 if (r < 0)
3296 log_link_error_errno(link, r, "Failed to configure link: %m");
3297 }
3298
3299 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3300
3301 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3302 * even if the method fails. */
3303 manager->has_product_uuid = true;
3304
3305 return 1;
3306 }
3307
3308 static bool link_requires_uuid(Link *link) {
3309 const DUID *duid;
3310
3311 assert(link);
3312 assert(link->manager);
3313 assert(link->network);
3314
3315 duid = link_get_duid(link);
3316 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3317 return false;
3318
3319 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3320 return true;
3321
3322 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3323 return true;
3324
3325 return false;
3326 }
3327
3328 static int link_configure_duid(Link *link) {
3329 Manager *m;
3330 DUID *duid;
3331 int r;
3332
3333 assert(link);
3334 assert(link->manager);
3335 assert(link->network);
3336
3337 m = link->manager;
3338 duid = link_get_duid(link);
3339
3340 if (!link_requires_uuid(link))
3341 return 1;
3342
3343 if (m->has_product_uuid) {
3344 (void) duid_set_uuid(duid, m->product_uuid);
3345 return 1;
3346 }
3347
3348 if (!m->links_requesting_uuid) {
3349 r = manager_request_product_uuid(m, link);
3350 if (r < 0) {
3351 if (r == -ENOMEM)
3352 return r;
3353
3354 log_link_warning_errno(link, r,
3355 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3356 return 1;
3357 }
3358 } else {
3359 r = set_put(m->links_requesting_uuid, link);
3360 if (r < 0)
3361 return log_oom();
3362
3363 r = set_put(m->duids_requesting_uuid, duid);
3364 if (r < 0)
3365 return log_oom();
3366 }
3367
3368 return 0;
3369 }
3370
3371 static int link_initialized_and_synced(Link *link) {
3372 Network *network;
3373 int r;
3374
3375 assert(link);
3376 assert(link->ifname);
3377 assert(link->manager);
3378
3379 /* We may get called either from the asynchronous netlink callback,
3380 * or directly for link_add() if running in a container. See link_add(). */
3381 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3382 return 0;
3383
3384 log_link_debug(link, "Link state is up-to-date");
3385 link_set_state(link, LINK_STATE_INITIALIZED);
3386
3387 r = link_new_bound_by_list(link);
3388 if (r < 0)
3389 return r;
3390
3391 r = link_handle_bound_by_list(link);
3392 if (r < 0)
3393 return r;
3394
3395 if (!link->network) {
3396 r = network_get(link->manager, link->sd_device, link->ifname,
3397 &link->mac, &network);
3398 if (r == -ENOENT) {
3399 link_enter_unmanaged(link);
3400 return 0;
3401 } else if (r == 0 && network->unmanaged) {
3402 link_enter_unmanaged(link);
3403 return 0;
3404 } else if (r < 0)
3405 return r;
3406
3407 if (link->flags & IFF_LOOPBACK) {
3408 if (network->link_local != ADDRESS_FAMILY_NO)
3409 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3410
3411 if (network->dhcp != ADDRESS_FAMILY_NO)
3412 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3413
3414 if (network->dhcp_server)
3415 log_link_debug(link, "Ignoring DHCP server for loopback link");
3416 }
3417
3418 r = network_apply(network, link);
3419 if (r < 0)
3420 return r;
3421 }
3422
3423 r = link_new_bound_to_list(link);
3424 if (r < 0)
3425 return r;
3426
3427 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3428 * link_configure() is called later asynchronously. */
3429 r = link_configure_duid(link);
3430 if (r <= 0)
3431 return r;
3432
3433 r = link_configure(link);
3434 if (r < 0)
3435 return r;
3436
3437 return 0;
3438 }
3439
3440 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3441 (void) link_initialized_and_synced(link);
3442 return 1;
3443 }
3444
3445 int link_initialized(Link *link, sd_device *device) {
3446 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3447 int r;
3448
3449 assert(link);
3450 assert(link->manager);
3451 assert(link->manager->rtnl);
3452 assert(device);
3453
3454 if (link->state != LINK_STATE_PENDING)
3455 return 0;
3456
3457 if (link->sd_device)
3458 return 0;
3459
3460 log_link_debug(link, "udev initialized link");
3461 link_set_state(link, LINK_STATE_INITIALIZED);
3462
3463 link->sd_device = sd_device_ref(device);
3464
3465 /* udev has initialized the link, but we don't know if we have yet
3466 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3467 * when it returns we know that the pending NEWLINKs have already been
3468 * processed and that we are up-to-date */
3469
3470 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3471 link->ifindex);
3472 if (r < 0)
3473 return r;
3474
3475 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3476 link_netlink_destroy_callback, link);
3477 if (r < 0)
3478 return r;
3479
3480 link_ref(link);
3481
3482 return 0;
3483 }
3484
3485 static int link_load(Link *link) {
3486 _cleanup_free_ char *network_file = NULL,
3487 *addresses = NULL,
3488 *routes = NULL,
3489 *dhcp4_address = NULL,
3490 *ipv4ll_address = NULL;
3491 union in_addr_union address;
3492 union in_addr_union route_dst;
3493 const char *p;
3494 int r;
3495
3496 assert(link);
3497
3498 r = parse_env_file(NULL, link->state_file,
3499 "NETWORK_FILE", &network_file,
3500 "ADDRESSES", &addresses,
3501 "ROUTES", &routes,
3502 "DHCP4_ADDRESS", &dhcp4_address,
3503 "IPV4LL_ADDRESS", &ipv4ll_address);
3504 if (r < 0 && r != -ENOENT)
3505 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3506
3507 if (network_file) {
3508 Network *network;
3509 char *suffix;
3510
3511 /* drop suffix */
3512 suffix = strrchr(network_file, '.');
3513 if (!suffix) {
3514 log_link_debug(link, "Failed to get network name from %s", network_file);
3515 goto network_file_fail;
3516 }
3517 *suffix = '\0';
3518
3519 r = network_get_by_name(link->manager, basename(network_file), &network);
3520 if (r < 0) {
3521 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3522 goto network_file_fail;
3523 }
3524
3525 r = network_apply(network, link);
3526 if (r < 0)
3527 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3528 }
3529
3530 network_file_fail:
3531
3532 if (addresses) {
3533 p = addresses;
3534
3535 for (;;) {
3536 _cleanup_free_ char *address_str = NULL;
3537 char *prefixlen_str;
3538 int family;
3539 unsigned char prefixlen;
3540
3541 r = extract_first_word(&p, &address_str, NULL, 0);
3542 if (r < 0) {
3543 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3544 continue;
3545 }
3546 if (r == 0)
3547 break;
3548
3549 prefixlen_str = strchr(address_str, '/');
3550 if (!prefixlen_str) {
3551 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3552 continue;
3553 }
3554
3555 *prefixlen_str++ = '\0';
3556
3557 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3558 if (r != 1) {
3559 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3560 continue;
3561 }
3562
3563 r = in_addr_from_string_auto(address_str, &family, &address);
3564 if (r < 0) {
3565 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3566 continue;
3567 }
3568
3569 r = address_add(link, family, &address, prefixlen, NULL);
3570 if (r < 0)
3571 return log_link_error_errno(link, r, "Failed to add address: %m");
3572 }
3573 }
3574
3575 if (routes) {
3576 p = routes;
3577
3578 for (;;) {
3579 Route *route;
3580 _cleanup_free_ char *route_str = NULL;
3581 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3582 usec_t lifetime;
3583 char *prefixlen_str;
3584 int family;
3585 unsigned char prefixlen, tos, table;
3586 uint32_t priority;
3587
3588 r = extract_first_word(&p, &route_str, NULL, 0);
3589 if (r < 0) {
3590 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3591 continue;
3592 }
3593 if (r == 0)
3594 break;
3595
3596 prefixlen_str = strchr(route_str, '/');
3597 if (!prefixlen_str) {
3598 log_link_debug(link, "Failed to parse route %s", route_str);
3599 continue;
3600 }
3601
3602 *prefixlen_str++ = '\0';
3603
3604 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3605 if (r != 5) {
3606 log_link_debug(link,
3607 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3608 prefixlen_str);
3609 continue;
3610 }
3611
3612 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3613 if (r < 0) {
3614 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3615 continue;
3616 }
3617
3618 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3619 if (r < 0)
3620 return log_link_error_errno(link, r, "Failed to add route: %m");
3621
3622 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3623 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3624 0, route_expire_handler, route);
3625 if (r < 0)
3626 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3627 }
3628
3629 route->lifetime = lifetime;
3630 sd_event_source_unref(route->expire);
3631 route->expire = TAKE_PTR(expire);
3632 }
3633 }
3634
3635 if (dhcp4_address) {
3636 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3637 if (r < 0) {
3638 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3639 goto dhcp4_address_fail;
3640 }
3641
3642 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3643 if (r < 0)
3644 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3645
3646 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3647 if (r < 0)
3648 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3649 }
3650
3651 dhcp4_address_fail:
3652
3653 if (ipv4ll_address) {
3654 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3655 if (r < 0) {
3656 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3657 goto ipv4ll_address_fail;
3658 }
3659
3660 r = sd_ipv4ll_new(&link->ipv4ll);
3661 if (r < 0)
3662 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3663
3664 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3665 if (r < 0)
3666 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3667 }
3668
3669 ipv4ll_address_fail:
3670
3671 return 0;
3672 }
3673
3674 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3675 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3676 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3677 Link *link;
3678 int r;
3679
3680 assert(m);
3681 assert(m->rtnl);
3682 assert(message);
3683 assert(ret);
3684
3685 r = link_new(m, message, ret);
3686 if (r < 0)
3687 return r;
3688
3689 link = *ret;
3690
3691 log_link_debug(link, "Link %d added", link->ifindex);
3692
3693 r = link_load(link);
3694 if (r < 0)
3695 return r;
3696
3697 if (detect_container() <= 0) {
3698 /* not in a container, udev will be around */
3699 sprintf(ifindex_str, "n%d", link->ifindex);
3700 r = sd_device_new_from_device_id(&device, ifindex_str);
3701 if (r < 0) {
3702 log_link_warning_errno(link, r, "Could not find device: %m");
3703 goto failed;
3704 }
3705
3706 r = sd_device_get_is_initialized(device);
3707 if (r < 0) {
3708 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3709 goto failed;
3710 }
3711 if (r == 0) {
3712 /* not yet ready */
3713 log_link_debug(link, "link pending udev initialization...");
3714 return 0;
3715 }
3716
3717 r = device_is_renaming(device);
3718 if (r < 0) {
3719 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3720 goto failed;
3721 }
3722 if (r > 0) {
3723 log_link_debug(link, "Interface is under renaming, pending initialization.");
3724 return 0;
3725 }
3726
3727 r = link_initialized(link, device);
3728 if (r < 0)
3729 goto failed;
3730 } else {
3731 r = link_initialized_and_synced(link);
3732 if (r < 0)
3733 goto failed;
3734 }
3735
3736 return 0;
3737 failed:
3738 link_enter_failed(link);
3739 return r;
3740 }
3741
3742 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3743 int r;
3744
3745 assert(link);
3746
3747 log_link_info(link, "Gained IPv6LL");
3748
3749 link->ipv6ll_address = *address;
3750 link_check_ready(link);
3751
3752 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3753 r = link_acquire_ipv6_conf(link);
3754 if (r < 0) {
3755 link_enter_failed(link);
3756 return r;
3757 }
3758 }
3759
3760 return 0;
3761 }
3762
3763 static int link_carrier_gained(Link *link) {
3764 int r;
3765
3766 assert(link);
3767
3768 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3769 r = link_acquire_conf(link);
3770 if (r < 0) {
3771 link_enter_failed(link);
3772 return r;
3773 }
3774
3775 r = link_request_set_addresses(link);
3776 if (r < 0)
3777 return r;
3778 }
3779
3780 r = link_handle_bound_by_list(link);
3781 if (r < 0)
3782 return r;
3783
3784 return 0;
3785 }
3786
3787 static int link_carrier_lost(Link *link) {
3788 int r;
3789
3790 assert(link);
3791
3792 if (link->network && link->network->ignore_carrier_loss)
3793 return 0;
3794
3795 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3796 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3797 * configuration and stop the clients as well. */
3798 if (link->setting_mtu)
3799 return 0;
3800
3801 r = link_stop_clients(link);
3802 if (r < 0) {
3803 link_enter_failed(link);
3804 return r;
3805 }
3806
3807 if (link_dhcp4_server_enabled(link))
3808 (void) sd_dhcp_server_stop(link->dhcp_server);
3809
3810 r = link_drop_config(link);
3811 if (r < 0)
3812 return r;
3813
3814 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3815 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3816 r = link_drop_foreign_config(link);
3817 if (r < 0)
3818 return r;
3819 }
3820
3821 r = link_handle_bound_by_list(link);
3822 if (r < 0)
3823 return r;
3824
3825 return 0;
3826 }
3827
3828 int link_carrier_reset(Link *link) {
3829 int r;
3830
3831 assert(link);
3832
3833 if (link_has_carrier(link)) {
3834 r = link_carrier_lost(link);
3835 if (r < 0)
3836 return r;
3837
3838 r = link_carrier_gained(link);
3839 if (r < 0)
3840 return r;
3841
3842 log_link_info(link, "Reset carrier");
3843 }
3844
3845 return 0;
3846 }
3847
3848 int link_update(Link *link, sd_netlink_message *m) {
3849 struct ether_addr mac;
3850 const char *ifname;
3851 uint32_t mtu;
3852 bool had_carrier, carrier_gained, carrier_lost;
3853 int r;
3854
3855 assert(link);
3856 assert(link->ifname);
3857 assert(m);
3858
3859 if (link->state == LINK_STATE_LINGER) {
3860 log_link_info(link, "Link re-added");
3861 link_set_state(link, LINK_STATE_CONFIGURING);
3862
3863 r = link_new_carrier_maps(link);
3864 if (r < 0)
3865 return r;
3866 }
3867
3868 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3869 if (r >= 0 && !streq(ifname, link->ifname)) {
3870 Manager *manager = link->manager;
3871
3872 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3873
3874 link_drop(link);
3875 r = link_add(manager, m, &link);
3876 if (r < 0)
3877 return r;
3878 }
3879
3880 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3881 if (r >= 0 && mtu > 0) {
3882 link->mtu = mtu;
3883 if (link->original_mtu == 0) {
3884 link->original_mtu = mtu;
3885 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3886 }
3887
3888 if (link->dhcp_client) {
3889 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3890 link->mtu);
3891 if (r < 0)
3892 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3893 }
3894
3895 if (link->radv) {
3896 r = sd_radv_set_mtu(link->radv, link->mtu);
3897 if (r < 0)
3898 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3899 }
3900 }
3901
3902 /* The kernel may broadcast NEWLINK messages without the MAC address
3903 set, simply ignore them. */
3904 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3905 if (r >= 0) {
3906 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3907 ETH_ALEN)) {
3908
3909 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3910 ETH_ALEN);
3911
3912 log_link_debug(link, "MAC address: "
3913 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3914 mac.ether_addr_octet[0],
3915 mac.ether_addr_octet[1],
3916 mac.ether_addr_octet[2],
3917 mac.ether_addr_octet[3],
3918 mac.ether_addr_octet[4],
3919 mac.ether_addr_octet[5]);
3920
3921 if (link->ipv4ll) {
3922 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3923 if (r < 0)
3924 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3925 }
3926
3927 if (link->dhcp_client) {
3928 r = sd_dhcp_client_set_mac(link->dhcp_client,
3929 (const uint8_t *) &link->mac,
3930 sizeof (link->mac),
3931 ARPHRD_ETHER);
3932 if (r < 0)
3933 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3934
3935 r = dhcp4_set_client_identifier(link);
3936 if (r < 0)
3937 return r;
3938 }
3939
3940 if (link->dhcp6_client) {
3941 const DUID* duid = link_get_duid(link);
3942
3943 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3944 (const uint8_t *) &link->mac,
3945 sizeof (link->mac),
3946 ARPHRD_ETHER);
3947 if (r < 0)
3948 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3949
3950 if (link->network->iaid_set) {
3951 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3952 link->network->iaid);
3953 if (r < 0)
3954 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3955 }
3956
3957 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3958 duid->type,
3959 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3960 duid->raw_data_len);
3961 if (r < 0)
3962 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3963 }
3964
3965 if (link->radv) {
3966 r = sd_radv_set_mac(link->radv, &link->mac);
3967 if (r < 0)
3968 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3969 }
3970
3971 if (link->ndisc) {
3972 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3973 if (r < 0)
3974 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3975 }
3976 }
3977 }
3978
3979 had_carrier = link_has_carrier(link);
3980
3981 r = link_update_flags(link, m);
3982 if (r < 0)
3983 return r;
3984
3985 r = link_update_lldp(link);
3986 if (r < 0)
3987 return r;
3988
3989 carrier_gained = !had_carrier && link_has_carrier(link);
3990 carrier_lost = had_carrier && !link_has_carrier(link);
3991
3992 if (carrier_gained) {
3993 log_link_info(link, "Gained carrier");
3994
3995 r = link_carrier_gained(link);
3996 if (r < 0)
3997 return r;
3998 } else if (carrier_lost) {
3999 log_link_info(link, "Lost carrier");
4000
4001 r = link_carrier_lost(link);
4002 if (r < 0)
4003 return r;
4004 }
4005
4006 return 0;
4007 }
4008
4009 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
4010 bool space = false;
4011 Iterator i;
4012 Link *link;
4013
4014 assert(f);
4015 assert(prefix);
4016
4017 if (hashmap_isempty(h))
4018 return;
4019
4020 fputs(prefix, f);
4021 HASHMAP_FOREACH(link, h, i) {
4022 if (space)
4023 fputc(' ', f);
4024
4025 fprintf(f, "%i", link->ifindex);
4026 space = true;
4027 }
4028
4029 fputc('\n', f);
4030 }
4031
4032 int link_save(Link *link) {
4033 _cleanup_free_ char *temp_path = NULL;
4034 _cleanup_fclose_ FILE *f = NULL;
4035 const char *admin_state, *oper_state;
4036 Address *a;
4037 Route *route;
4038 Iterator i;
4039 int r;
4040
4041 assert(link);
4042 assert(link->state_file);
4043 assert(link->lease_file);
4044 assert(link->manager);
4045
4046 if (link->state == LINK_STATE_LINGER) {
4047 (void) unlink(link->state_file);
4048 return 0;
4049 }
4050
4051 link_lldp_save(link);
4052
4053 admin_state = link_state_to_string(link->state);
4054 assert(admin_state);
4055
4056 oper_state = link_operstate_to_string(link->operstate);
4057 assert(oper_state);
4058
4059 r = fopen_temporary(link->state_file, &f, &temp_path);
4060 if (r < 0)
4061 goto fail;
4062
4063 (void) fchmod(fileno(f), 0644);
4064
4065 fprintf(f,
4066 "# This is private data. Do not parse.\n"
4067 "ADMIN_STATE=%s\n"
4068 "OPER_STATE=%s\n",
4069 admin_state, oper_state);
4070
4071 if (link->network) {
4072 bool space;
4073 sd_dhcp6_lease *dhcp6_lease = NULL;
4074 const char *dhcp_domainname = NULL;
4075 char **dhcp6_domains = NULL;
4076 char **dhcp_domains = NULL;
4077 unsigned j;
4078
4079 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4080 yes_no(link->network->required_for_online));
4081
4082 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
4083 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
4084
4085 if (link->dhcp6_client) {
4086 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
4087 if (r < 0 && r != -ENOMSG)
4088 log_link_debug(link, "No DHCPv6 lease");
4089 }
4090
4091 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4092
4093 fputs("DNS=", f);
4094 space = false;
4095
4096 for (j = 0; j < link->network->n_dns; j++) {
4097 _cleanup_free_ char *b = NULL;
4098
4099 r = in_addr_to_string(link->network->dns[j].family,
4100 &link->network->dns[j].address, &b);
4101 if (r < 0) {
4102 log_debug_errno(r, "Failed to format address, ignoring: %m");
4103 continue;
4104 }
4105
4106 if (space)
4107 fputc(' ', f);
4108 fputs(b, f);
4109 space = true;
4110 }
4111
4112 if (link->network->dhcp_use_dns &&
4113 link->dhcp_lease) {
4114 const struct in_addr *addresses;
4115
4116 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
4117 if (r > 0)
4118 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4119 space = true;
4120 }
4121
4122 if (link->network->dhcp_use_dns && dhcp6_lease) {
4123 struct in6_addr *in6_addrs;
4124
4125 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
4126 if (r > 0) {
4127 if (space)
4128 fputc(' ', f);
4129 serialize_in6_addrs(f, in6_addrs, r);
4130 space = true;
4131 }
4132 }
4133
4134 /* Make sure to flush out old entries before we use the NDISC data */
4135 ndisc_vacuum(link);
4136
4137 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4138 NDiscRDNSS *dd;
4139
4140 SET_FOREACH(dd, link->ndisc_rdnss, i) {
4141 if (space)
4142 fputc(' ', f);
4143
4144 serialize_in6_addrs(f, &dd->address, 1);
4145 space = true;
4146 }
4147 }
4148
4149 fputc('\n', f);
4150
4151 fputs("NTP=", f);
4152 space = false;
4153 fputstrv(f, link->network->ntp, NULL, &space);
4154
4155 if (link->network->dhcp_use_ntp &&
4156 link->dhcp_lease) {
4157 const struct in_addr *addresses;
4158
4159 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
4160 if (r > 0)
4161 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4162 space = true;
4163 }
4164
4165 if (link->network->dhcp_use_ntp && dhcp6_lease) {
4166 struct in6_addr *in6_addrs;
4167 char **hosts;
4168
4169 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
4170 &in6_addrs);
4171 if (r > 0) {
4172 if (space)
4173 fputc(' ', f);
4174 serialize_in6_addrs(f, in6_addrs, r);
4175 space = true;
4176 }
4177
4178 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
4179 if (r > 0)
4180 fputstrv(f, hosts, NULL, &space);
4181 }
4182
4183 fputc('\n', f);
4184
4185 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4186 if (link->dhcp_lease) {
4187 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4188 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4189 }
4190 if (dhcp6_lease)
4191 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4192 }
4193
4194 ordered_set_print(f, "DOMAINS=", link->network->search_domains);
4195
4196 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4197 NDiscDNSSL *dd;
4198
4199 if (dhcp_domainname)
4200 fputs_with_space(f, dhcp_domainname, NULL, &space);
4201 if (dhcp_domains)
4202 fputstrv(f, dhcp_domains, NULL, &space);
4203 if (dhcp6_domains)
4204 fputstrv(f, dhcp6_domains, NULL, &space);
4205
4206 SET_FOREACH(dd, link->ndisc_dnssl, i)
4207 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4208 }
4209
4210 fputc('\n', f);
4211
4212 ordered_set_print(f, "ROUTE_DOMAINS=", link->network->route_domains);
4213
4214 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4215 NDiscDNSSL *dd;
4216
4217 if (dhcp_domainname)
4218 fputs_with_space(f, dhcp_domainname, NULL, &space);
4219 if (dhcp_domains)
4220 fputstrv(f, dhcp_domains, NULL, &space);
4221 if (dhcp6_domains)
4222 fputstrv(f, dhcp6_domains, NULL, &space);
4223
4224 SET_FOREACH(dd, link->ndisc_dnssl, i)
4225 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4226 }
4227
4228 fputc('\n', f);
4229
4230 fprintf(f, "LLMNR=%s\n",
4231 resolve_support_to_string(link->network->llmnr));
4232 fprintf(f, "MDNS=%s\n",
4233 resolve_support_to_string(link->network->mdns));
4234 if (link->network->dns_default_route >= 0)
4235 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
4236
4237 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4238 fprintf(f, "DNS_OVER_TLS=%s\n",
4239 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
4240
4241 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
4242 fprintf(f, "DNSSEC=%s\n",
4243 dnssec_mode_to_string(link->network->dnssec_mode));
4244
4245 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
4246 const char *n;
4247
4248 fputs("DNSSEC_NTA=", f);
4249 space = false;
4250 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
4251 fputs_with_space(f, n, NULL, &space);
4252 fputc('\n', f);
4253 }
4254
4255 fputs("ADDRESSES=", f);
4256 space = false;
4257 SET_FOREACH(a, link->addresses, i) {
4258 _cleanup_free_ char *address_str = NULL;
4259
4260 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4261 if (r < 0)
4262 goto fail;
4263
4264 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4265 space = true;
4266 }
4267 fputc('\n', f);
4268
4269 fputs("ROUTES=", f);
4270 space = false;
4271 SET_FOREACH(route, link->routes, i) {
4272 _cleanup_free_ char *route_str = NULL;
4273
4274 r = in_addr_to_string(route->family, &route->dst, &route_str);
4275 if (r < 0)
4276 goto fail;
4277
4278 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4279 space ? " " : "", route_str,
4280 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4281 space = true;
4282 }
4283
4284 fputc('\n', f);
4285 }
4286
4287 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4288 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4289
4290 if (link->dhcp_lease) {
4291 struct in_addr address;
4292 const char *tz = NULL;
4293
4294 assert(link->network);
4295
4296 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
4297 if (r >= 0)
4298 fprintf(f, "TIMEZONE=%s\n", tz);
4299
4300 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
4301 if (r >= 0) {
4302 fputs("DHCP4_ADDRESS=", f);
4303 serialize_in_addrs(f, &address, 1, false, NULL);
4304 fputc('\n', f);
4305 }
4306
4307 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4308 if (r < 0)
4309 goto fail;
4310
4311 fprintf(f,
4312 "DHCP_LEASE=%s\n",
4313 link->lease_file);
4314 } else
4315 (void) unlink(link->lease_file);
4316
4317 if (link->ipv4ll) {
4318 struct in_addr address;
4319
4320 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4321 if (r >= 0) {
4322 fputs("IPV4LL_ADDRESS=", f);
4323 serialize_in_addrs(f, &address, 1, false, NULL);
4324 fputc('\n', f);
4325 }
4326 }
4327
4328 r = fflush_and_check(f);
4329 if (r < 0)
4330 goto fail;
4331
4332 if (rename(temp_path, link->state_file) < 0) {
4333 r = -errno;
4334 goto fail;
4335 }
4336
4337 return 0;
4338
4339 fail:
4340 (void) unlink(link->state_file);
4341 if (temp_path)
4342 (void) unlink(temp_path);
4343
4344 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4345 }
4346
4347 /* The serialized state in /run is no longer up-to-date. */
4348 void link_dirty(Link *link) {
4349 int r;
4350
4351 assert(link);
4352
4353 /* mark manager dirty as link is dirty */
4354 manager_dirty(link->manager);
4355
4356 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
4357 if (r < 0)
4358 /* allocation errors are ignored */
4359 return;
4360
4361 r = set_put(link->manager->dirty_links, link);
4362 if (r <= 0)
4363 /* don't take another ref if the link was already dirty */
4364 return;
4365
4366 link_ref(link);
4367 }
4368
4369 /* The serialized state in /run is up-to-date */
4370 void link_clean(Link *link) {
4371 assert(link);
4372 assert(link->manager);
4373
4374 link_unref(set_remove(link->manager->dirty_links, link));
4375 }
4376
4377 static const char* const link_state_table[_LINK_STATE_MAX] = {
4378 [LINK_STATE_PENDING] = "pending",
4379 [LINK_STATE_INITIALIZED] = "initialized",
4380 [LINK_STATE_CONFIGURING] = "configuring",
4381 [LINK_STATE_CONFIGURED] = "configured",
4382 [LINK_STATE_UNMANAGED] = "unmanaged",
4383 [LINK_STATE_FAILED] = "failed",
4384 [LINK_STATE_LINGER] = "linger",
4385 };
4386
4387 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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