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network: remove redunant link name in message
[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: %m", enable_disable(!disabled));
342 else
343 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
344
345 return 0;
346 }
347
348 static bool link_is_enslaved(Link *link) {
349 if (link->flags & IFF_SLAVE)
350 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
351 return true;
352
353 if (!link->enslaved_raw)
354 return false;
355
356 if (!link->network)
357 return false;
358
359 if (link->network->bridge)
360 /* TODO: support the case when link is not managed by networkd. */
361 return true;
362
363 return false;
364 }
365
366 static void link_update_master_operstate(Link *link, NetDev *netdev) {
367 Link *master;
368
369 if (!netdev)
370 return;
371
372 if (link_get(link->manager, netdev->ifindex, &master) < 0)
373 return;
374
375 link_update_operstate(master, true);
376 }
377
378 void link_update_operstate(Link *link, bool also_update_master) {
379 LinkOperationalState operstate;
380 Iterator i;
381
382 assert(link);
383
384 if (link->kernel_operstate == IF_OPER_DORMANT)
385 operstate = LINK_OPERSTATE_DORMANT;
386 else if (link_has_carrier(link)) {
387 Address *address;
388 uint8_t scope = RT_SCOPE_NOWHERE;
389
390 /* if we have carrier, check what addresses we have */
391 SET_FOREACH(address, link->addresses, i) {
392 if (!address_is_ready(address))
393 continue;
394
395 if (address->scope < scope)
396 scope = address->scope;
397 }
398
399 /* for operstate we also take foreign addresses into account */
400 SET_FOREACH(address, link->addresses_foreign, i) {
401 if (!address_is_ready(address))
402 continue;
403
404 if (address->scope < scope)
405 scope = address->scope;
406 }
407
408 if (scope < RT_SCOPE_SITE)
409 /* universally accessible addresses found */
410 operstate = LINK_OPERSTATE_ROUTABLE;
411 else if (scope < RT_SCOPE_HOST)
412 /* only link or site local addresses found */
413 operstate = LINK_OPERSTATE_DEGRADED;
414 else
415 /* no useful addresses found */
416 operstate = LINK_OPERSTATE_CARRIER;
417 } else if (link->flags & IFF_UP)
418 operstate = LINK_OPERSTATE_NO_CARRIER;
419 else
420 operstate = LINK_OPERSTATE_OFF;
421
422 if (IN_SET(operstate, LINK_OPERSTATE_DEGRADED, LINK_OPERSTATE_CARRIER) &&
423 link_is_enslaved(link))
424 operstate = LINK_OPERSTATE_ENSLAVED;
425
426 if (operstate >= LINK_OPERSTATE_CARRIER) {
427 Link *slave;
428
429 SET_FOREACH(slave, link->slaves, i) {
430 link_update_operstate(slave, false);
431
432 if (slave->operstate < LINK_OPERSTATE_CARRIER)
433 operstate = LINK_OPERSTATE_DEGRADED_CARRIER;
434 }
435 }
436
437 if (link->operstate != operstate) {
438 link->operstate = operstate;
439 link_send_changed(link, "OperationalState", NULL);
440 link_dirty(link);
441 }
442
443 if (also_update_master && link->network) {
444 link_update_master_operstate(link, link->network->bond);
445 link_update_master_operstate(link, link->network->bridge);
446 }
447 }
448
449 #define FLAG_STRING(string, flag, old, new) \
450 (((old ^ new) & flag) \
451 ? ((old & flag) ? (" -" string) : (" +" string)) \
452 : "")
453
454 static int link_update_flags(Link *link, sd_netlink_message *m) {
455 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
456 uint8_t operstate;
457 int r;
458
459 assert(link);
460
461 r = sd_rtnl_message_link_get_flags(m, &flags);
462 if (r < 0)
463 return log_link_warning_errno(link, r, "Could not get link flags: %m");
464
465 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
466 if (r < 0)
467 /* if we got a message without operstate, take it to mean
468 the state was unchanged */
469 operstate = link->kernel_operstate;
470
471 if ((link->flags == flags) && (link->kernel_operstate == operstate))
472 return 0;
473
474 if (link->flags != flags) {
475 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",
476 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
477 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
478 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
479 FLAG_STRING("UP", IFF_UP, link->flags, flags),
480 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
481 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
482 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
483 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
484 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
485 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
486 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
487 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
488 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
489 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
490 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
491 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
492 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
493 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
494 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
495
496 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
497 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
498 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
499 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
500 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
501 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
502 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
503 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
504
505 /* link flags are currently at most 18 bits, let's align to
506 * printing 20 */
507 if (unknown_flags_added)
508 log_link_debug(link,
509 "Unknown link flags gained: %#.5x (ignoring)",
510 unknown_flags_added);
511
512 if (unknown_flags_removed)
513 log_link_debug(link,
514 "Unknown link flags lost: %#.5x (ignoring)",
515 unknown_flags_removed);
516 }
517
518 link->flags = flags;
519 link->kernel_operstate = operstate;
520
521 link_update_operstate(link, true);
522
523 return 0;
524 }
525
526 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_unref);
527
528 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
529 _cleanup_(link_unrefp) Link *link = NULL;
530 uint16_t type;
531 const char *ifname, *kind = NULL;
532 int r, ifindex;
533 unsigned short iftype;
534
535 assert(manager);
536 assert(message);
537 assert(ret);
538
539 /* check for link kind */
540 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
541 if (r == 0) {
542 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
543 r = sd_netlink_message_exit_container(message);
544 if (r < 0)
545 return r;
546 }
547
548 r = sd_netlink_message_get_type(message, &type);
549 if (r < 0)
550 return r;
551 else if (type != RTM_NEWLINK)
552 return -EINVAL;
553
554 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
555 if (r < 0)
556 return r;
557 else if (ifindex <= 0)
558 return -EINVAL;
559
560 r = sd_rtnl_message_link_get_type(message, &iftype);
561 if (r < 0)
562 return r;
563
564 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
565 if (r < 0)
566 return r;
567
568 link = new(Link, 1);
569 if (!link)
570 return -ENOMEM;
571
572 *link = (Link) {
573 .n_ref = 1,
574 .manager = manager,
575 .state = LINK_STATE_PENDING,
576 .rtnl_extended_attrs = true,
577 .ifindex = ifindex,
578 .iftype = iftype,
579 };
580
581 link->ifname = strdup(ifname);
582 if (!link->ifname)
583 return -ENOMEM;
584
585 if (kind) {
586 link->kind = strdup(kind);
587 if (!link->kind)
588 return -ENOMEM;
589 }
590
591 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
592 if (r < 0)
593 log_link_debug_errno(link, r, "New device has no master, continuing without");
594
595 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
596 if (r < 0)
597 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
598
599 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
600 return -ENOMEM;
601
602 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
603 return -ENOMEM;
604
605 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
606 return -ENOMEM;
607
608 r = hashmap_ensure_allocated(&manager->links, NULL);
609 if (r < 0)
610 return r;
611
612 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
613 if (r < 0)
614 return r;
615
616 r = link_update_flags(link, message);
617 if (r < 0)
618 return r;
619
620 *ret = TAKE_PTR(link);
621
622 return 0;
623 }
624
625 static Link *link_free(Link *link) {
626 Link *carrier;
627 Address *address;
628 Route *route;
629 Iterator i;
630
631 assert(link);
632
633 while ((route = set_first(link->routes)))
634 route_free(route);
635
636 while ((route = set_first(link->routes_foreign)))
637 route_free(route);
638
639 link->routes = set_free(link->routes);
640 link->routes_foreign = set_free(link->routes_foreign);
641
642 while ((address = set_first(link->addresses)))
643 address_free(address);
644
645 while ((address = set_first(link->addresses_foreign)))
646 address_free(address);
647
648 link->addresses = set_free(link->addresses);
649 link->addresses_foreign = set_free(link->addresses_foreign);
650
651 while ((address = link->pool_addresses)) {
652 LIST_REMOVE(addresses, link->pool_addresses, address);
653 address_free(address);
654 }
655
656 sd_dhcp_server_unref(link->dhcp_server);
657 sd_dhcp_client_unref(link->dhcp_client);
658 sd_dhcp_lease_unref(link->dhcp_lease);
659
660 link_lldp_emit_stop(link);
661
662 free(link->lease_file);
663
664 sd_lldp_unref(link->lldp);
665 free(link->lldp_file);
666
667 ndisc_flush(link);
668
669 sd_ipv4ll_unref(link->ipv4ll);
670 sd_dhcp6_client_unref(link->dhcp6_client);
671 sd_ndisc_unref(link->ndisc);
672 sd_radv_unref(link->radv);
673
674 free(link->ifname);
675 free(link->kind);
676
677 (void) unlink(link->state_file);
678 free(link->state_file);
679
680 sd_device_unref(link->sd_device);
681
682 HASHMAP_FOREACH (carrier, link->bound_to_links, i)
683 hashmap_remove(link->bound_to_links, INT_TO_PTR(carrier->ifindex));
684 hashmap_free(link->bound_to_links);
685
686 HASHMAP_FOREACH (carrier, link->bound_by_links, i)
687 hashmap_remove(link->bound_by_links, INT_TO_PTR(carrier->ifindex));
688 hashmap_free(link->bound_by_links);
689
690 set_free_with_destructor(link->slaves, link_unref);
691
692 return mfree(link);
693 }
694
695 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
696
697 int link_get(Manager *m, int ifindex, Link **ret) {
698 Link *link;
699
700 assert(m);
701 assert(ifindex);
702 assert(ret);
703
704 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
705 if (!link)
706 return -ENODEV;
707
708 *ret = link;
709
710 return 0;
711 }
712
713 static void link_set_state(Link *link, LinkState state) {
714 assert(link);
715
716 if (link->state == state)
717 return;
718
719 log_link_debug(link, "State changed: %s -> %s",
720 link_state_to_string(link->state),
721 link_state_to_string(state));
722
723 link->state = state;
724
725 link_send_changed(link, "AdministrativeState", NULL);
726 }
727
728 static void link_enter_unmanaged(Link *link) {
729 assert(link);
730
731 log_link_debug(link, "Unmanaged");
732
733 link_set_state(link, LINK_STATE_UNMANAGED);
734
735 link_dirty(link);
736 }
737
738 int link_stop_clients(Link *link) {
739 int r = 0, k;
740
741 assert(link);
742 assert(link->manager);
743 assert(link->manager->event);
744
745 if (link->dhcp_client) {
746 k = sd_dhcp_client_stop(link->dhcp_client);
747 if (k < 0)
748 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
749 }
750
751 if (link->ipv4ll) {
752 k = sd_ipv4ll_stop(link->ipv4ll);
753 if (k < 0)
754 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
755 }
756
757 if (link->dhcp6_client) {
758 k = sd_dhcp6_client_stop(link->dhcp6_client);
759 if (k < 0)
760 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
761 }
762
763 if (link->ndisc) {
764 k = sd_ndisc_stop(link->ndisc);
765 if (k < 0)
766 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
767 }
768
769 if (link->radv) {
770 k = sd_radv_stop(link->radv);
771 if (k < 0)
772 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
773 }
774
775 link_lldp_emit_stop(link);
776 return r;
777 }
778
779 void link_enter_failed(Link *link) {
780 assert(link);
781
782 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
783 return;
784
785 log_link_warning(link, "Failed");
786
787 link_set_state(link, LINK_STATE_FAILED);
788
789 link_stop_clients(link);
790
791 link_dirty(link);
792 }
793
794 static Address* link_find_dhcp_server_address(Link *link) {
795 Address *address;
796
797 assert(link);
798 assert(link->network);
799
800 /* The first statically configured address if there is any */
801 LIST_FOREACH(addresses, address, link->network->static_addresses) {
802
803 if (address->family != AF_INET)
804 continue;
805
806 if (in_addr_is_null(address->family, &address->in_addr))
807 continue;
808
809 return address;
810 }
811
812 /* If that didn't work, find a suitable address we got from the pool */
813 LIST_FOREACH(addresses, address, link->pool_addresses) {
814 if (address->family != AF_INET)
815 continue;
816
817 return address;
818 }
819
820 return NULL;
821 }
822
823 static int link_join_netdevs_after_configured(Link *link) {
824 NetDev *netdev;
825 Iterator i;
826 int r;
827
828 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
829 if (netdev->ifindex > 0)
830 /* Assume already enslaved. */
831 continue;
832
833 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
834 continue;
835
836 log_struct(LOG_DEBUG,
837 LOG_LINK_INTERFACE(link),
838 LOG_NETDEV_INTERFACE(netdev),
839 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
840
841 r = netdev_join(netdev, link, NULL);
842 if (r < 0)
843 return log_struct_errno(LOG_WARNING, r,
844 LOG_LINK_INTERFACE(link),
845 LOG_NETDEV_INTERFACE(netdev),
846 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
847 }
848
849 return 0;
850 }
851
852 static void link_enter_configured(Link *link) {
853 assert(link);
854 assert(link->network);
855
856 if (link->state != LINK_STATE_CONFIGURING)
857 return;
858
859 log_link_info(link, "Configured");
860
861 link_set_state(link, LINK_STATE_CONFIGURED);
862
863 (void) link_join_netdevs_after_configured(link);
864
865 link_dirty(link);
866 }
867
868 static int link_request_set_routing_policy_rule(Link *link) {
869 RoutingPolicyRule *rule, *rrule = NULL;
870 int r;
871
872 assert(link);
873 assert(link->network);
874
875 link_set_state(link, LINK_STATE_CONFIGURING);
876 link->routing_policy_rules_configured = false;
877
878 LIST_FOREACH(rules, rule, link->network->rules) {
879 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
880 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif,
881 rule->protocol, &rule->sport, &rule->dport, &rrule);
882 if (r == 0) {
883 (void) routing_policy_rule_make_local(link->manager, rrule);
884 continue;
885 }
886
887 r = routing_policy_rule_configure(rule, link, NULL, false);
888 if (r < 0) {
889 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
890 link_enter_failed(link);
891 return r;
892 }
893
894 link->routing_policy_rule_messages++;
895 }
896
897 routing_policy_rule_purge(link->manager, link);
898 if (link->routing_policy_rule_messages == 0) {
899 link->routing_policy_rules_configured = true;
900 link_check_ready(link);
901 } else
902 log_link_debug(link, "Setting routing policy rules");
903
904 return 0;
905 }
906
907 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
908 int r;
909
910 assert(link);
911 assert(link->route_messages > 0);
912 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
913 LINK_STATE_FAILED, LINK_STATE_LINGER));
914
915 link->route_messages--;
916
917 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
918 return 1;
919
920 r = sd_netlink_message_get_errno(m);
921 if (r < 0 && r != -EEXIST)
922 log_link_warning_errno(link, r, "Could not set route: %m");
923
924 if (link->route_messages == 0) {
925 log_link_debug(link, "Routes set");
926 link->static_routes_configured = true;
927 link_check_ready(link);
928 }
929
930 return 1;
931 }
932
933 int link_request_set_routes(Link *link) {
934 enum {
935 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
936 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
937 _PHASE_MAX
938 } phase;
939 Route *rt;
940 int r;
941
942 assert(link);
943 assert(link->network);
944 assert(link->addresses_configured);
945 assert(link->address_messages == 0);
946 assert(link->state != _LINK_STATE_INVALID);
947
948 link_set_state(link, LINK_STATE_CONFIGURING);
949 link->static_routes_configured = false;
950
951 r = link_request_set_routing_policy_rule(link);
952 if (r < 0)
953 return r;
954
955 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
956 for (phase = 0; phase < _PHASE_MAX; phase++)
957 LIST_FOREACH(routes, rt, link->network->static_routes) {
958
959 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
960 continue;
961
962 r = route_configure(rt, link, route_handler);
963 if (r < 0) {
964 log_link_warning_errno(link, r, "Could not set routes: %m");
965 link_enter_failed(link);
966 return r;
967 }
968
969 link->route_messages++;
970 }
971
972 if (link->route_messages == 0) {
973 link->static_routes_configured = true;
974 link_check_ready(link);
975 } else
976 log_link_debug(link, "Setting routes");
977
978 return 0;
979 }
980
981 void link_check_ready(Link *link) {
982 Address *a;
983 Iterator i;
984
985 assert(link);
986
987 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
988 return;
989
990 if (!link->network)
991 return;
992
993 if (!link->addresses_configured)
994 return;
995
996 if (!link->neighbors_configured)
997 return;
998
999 SET_FOREACH(a, link->addresses, i)
1000 if (!address_is_ready(a))
1001 return;
1002
1003 if (!link->addresses_ready) {
1004 link->addresses_ready = true;
1005 link_request_set_routes(link);
1006 }
1007
1008 if (!link->static_routes_configured)
1009 return;
1010
1011 if (!link->routing_policy_rules_configured)
1012 return;
1013
1014 if (link_ipv4ll_enabled(link) && !(link->ipv4ll_address && link->ipv4ll_route))
1015 return;
1016
1017 if (link_ipv6ll_enabled(link) &&
1018 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
1019 return;
1020
1021 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
1022 !(link->dhcp4_configured || link->dhcp6_configured) &&
1023 !(link_ipv4ll_fallback_enabled(link) && link->ipv4ll_address && link->ipv4ll_route))
1024 /* When DHCP is enabled, at least one protocol must provide an address, or
1025 * an IPv4ll fallback address must be configured. */
1026 return;
1027
1028 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
1029 return;
1030
1031 if (link->state != LINK_STATE_CONFIGURED)
1032 link_enter_configured(link);
1033
1034 return;
1035 }
1036
1037 static int link_request_set_neighbors(Link *link) {
1038 Neighbor *neighbor;
1039 int r;
1040
1041 assert(link);
1042 assert(link->network);
1043 assert(link->state != _LINK_STATE_INVALID);
1044
1045 link_set_state(link, LINK_STATE_CONFIGURING);
1046 link->neighbors_configured = false;
1047
1048 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1049 r = neighbor_configure(neighbor, link, NULL);
1050 if (r < 0) {
1051 log_link_warning_errno(link, r, "Could not set neighbor: %m");
1052 link_enter_failed(link);
1053 return r;
1054 }
1055 }
1056
1057 if (link->neighbor_messages == 0) {
1058 link->neighbors_configured = true;
1059 link_check_ready(link);
1060 } else
1061 log_link_debug(link, "Setting neighbors");
1062
1063 return 0;
1064 }
1065
1066 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1067 int r;
1068
1069 assert(rtnl);
1070 assert(m);
1071 assert(link);
1072 assert(link->ifname);
1073 assert(link->address_messages > 0);
1074 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1075 LINK_STATE_FAILED, LINK_STATE_LINGER));
1076
1077 link->address_messages--;
1078
1079 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1080 return 1;
1081
1082 r = sd_netlink_message_get_errno(m);
1083 if (r < 0 && r != -EEXIST)
1084 log_link_warning_errno(link, r, "could not set address: %m");
1085 else if (r >= 0)
1086 manager_rtnl_process_address(rtnl, m, link->manager);
1087
1088 if (link->address_messages == 0) {
1089 log_link_debug(link, "Addresses set");
1090 link->addresses_configured = true;
1091 link_check_ready(link);
1092 }
1093
1094 return 1;
1095 }
1096
1097 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1098 _cleanup_free_ struct in_addr *addresses = NULL;
1099 size_t n_addresses = 0, n_allocated = 0;
1100 unsigned i;
1101
1102 log_debug("Copying DNS server information from %s", link->ifname);
1103
1104 if (!link->network)
1105 return 0;
1106
1107 for (i = 0; i < link->network->n_dns; i++) {
1108 struct in_addr ia;
1109
1110 /* Only look for IPv4 addresses */
1111 if (link->network->dns[i].family != AF_INET)
1112 continue;
1113
1114 ia = link->network->dns[i].address.in;
1115
1116 /* Never propagate obviously borked data */
1117 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1118 continue;
1119
1120 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1121 return log_oom();
1122
1123 addresses[n_addresses++] = ia;
1124 }
1125
1126 if (link->network->dhcp_use_dns && link->dhcp_lease) {
1127 const struct in_addr *da = NULL;
1128 int j, n;
1129
1130 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
1131 if (n > 0) {
1132
1133 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1134 return log_oom();
1135
1136 for (j = 0; j < n; j++)
1137 if (in4_addr_is_non_local(&da[j]))
1138 addresses[n_addresses++] = da[j];
1139 }
1140 }
1141
1142 if (n_addresses <= 0)
1143 return 0;
1144
1145 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
1146 }
1147
1148 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1149 _cleanup_free_ struct in_addr *addresses = NULL;
1150 size_t n_addresses = 0, n_allocated = 0;
1151 char **a;
1152
1153 if (!link->network)
1154 return 0;
1155
1156 log_debug("Copying NTP server information from %s", link->ifname);
1157
1158 STRV_FOREACH(a, link->network->ntp) {
1159 struct in_addr ia;
1160
1161 /* Only look for IPv4 addresses */
1162 if (inet_pton(AF_INET, *a, &ia) <= 0)
1163 continue;
1164
1165 /* Never propagate obviously borked data */
1166 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1167 continue;
1168
1169 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1170 return log_oom();
1171
1172 addresses[n_addresses++] = ia;
1173 }
1174
1175 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1176 const struct in_addr *da = NULL;
1177 int j, n;
1178
1179 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1180 if (n > 0) {
1181
1182 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1183 return log_oom();
1184
1185 for (j = 0; j < n; j++)
1186 if (in4_addr_is_non_local(&da[j]))
1187 addresses[n_addresses++] = da[j];
1188 }
1189 }
1190
1191 if (n_addresses <= 0)
1192 return 0;
1193
1194 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1195 }
1196
1197 static int link_set_bridge_fdb(Link *link) {
1198 FdbEntry *fdb_entry;
1199 int r;
1200
1201 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1202 r = fdb_entry_configure(link, fdb_entry);
1203 if (r < 0)
1204 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1205 }
1206
1207 return 0;
1208 }
1209
1210 static int link_request_set_addresses(Link *link) {
1211 AddressLabel *label;
1212 Address *ad;
1213 int r;
1214
1215 assert(link);
1216 assert(link->network);
1217 assert(link->state != _LINK_STATE_INVALID);
1218
1219 link_set_state(link, LINK_STATE_CONFIGURING);
1220
1221 /* Reset all *_configured flags we are configuring. */
1222 link->addresses_configured = false;
1223 link->addresses_ready = false;
1224 link->neighbors_configured = false;
1225 link->static_routes_configured = false;
1226 link->routing_policy_rules_configured = false;
1227
1228 r = link_set_bridge_fdb(link);
1229 if (r < 0)
1230 return r;
1231
1232 r = link_request_set_neighbors(link);
1233 if (r < 0)
1234 return r;
1235
1236 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1237 bool update;
1238
1239 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1240
1241 r = address_configure(ad, link, address_handler, update);
1242 if (r < 0) {
1243 log_link_warning_errno(link, r, "Could not set addresses: %m");
1244 link_enter_failed(link);
1245 return r;
1246 }
1247
1248 link->address_messages++;
1249 }
1250
1251 LIST_FOREACH(labels, label, link->network->address_labels) {
1252 r = address_label_configure(label, link, NULL, false);
1253 if (r < 0) {
1254 log_link_warning_errno(link, r, "Could not set address label: %m");
1255 link_enter_failed(link);
1256 return r;
1257 }
1258
1259 link->address_label_messages++;
1260 }
1261
1262 /* now that we can figure out a default address for the dhcp server,
1263 start it */
1264 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1265 Address *address;
1266 Link *uplink = NULL;
1267 bool acquired_uplink = false;
1268
1269 address = link_find_dhcp_server_address(link);
1270 if (!address) {
1271 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1272 link_enter_failed(link);
1273 return 0;
1274 }
1275
1276 /* use the server address' subnet as the pool */
1277 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1278 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1279 if (r < 0)
1280 return r;
1281
1282 /* TODO:
1283 r = sd_dhcp_server_set_router(link->dhcp_server,
1284 &main_address->in_addr.in);
1285 if (r < 0)
1286 return r;
1287 */
1288
1289 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1290 r = sd_dhcp_server_set_max_lease_time(
1291 link->dhcp_server,
1292 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1293 if (r < 0)
1294 return r;
1295 }
1296
1297 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1298 r = sd_dhcp_server_set_default_lease_time(
1299 link->dhcp_server,
1300 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1301 if (r < 0)
1302 return r;
1303 }
1304
1305 if (link->network->dhcp_server_emit_dns) {
1306
1307 if (link->network->n_dhcp_server_dns > 0)
1308 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1309 else {
1310 uplink = manager_find_uplink(link->manager, link);
1311 acquired_uplink = true;
1312
1313 if (!uplink) {
1314 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1315 r = 0;
1316 } else
1317 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1318 }
1319 if (r < 0)
1320 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1321 }
1322
1323 if (link->network->dhcp_server_emit_ntp) {
1324
1325 if (link->network->n_dhcp_server_ntp > 0)
1326 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1327 else {
1328 if (!acquired_uplink)
1329 uplink = manager_find_uplink(link->manager, link);
1330
1331 if (!uplink) {
1332 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1333 r = 0;
1334 } else
1335 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1336
1337 }
1338 if (r < 0)
1339 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1340 }
1341
1342 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1343 if (r < 0)
1344 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1345
1346 if (link->network->dhcp_server_emit_timezone) {
1347 _cleanup_free_ char *buffer = NULL;
1348 const char *tz = NULL;
1349
1350 if (link->network->dhcp_server_timezone)
1351 tz = link->network->dhcp_server_timezone;
1352 else {
1353 r = get_timezone(&buffer);
1354 if (r < 0)
1355 log_warning_errno(r, "Failed to determine timezone: %m");
1356 else
1357 tz = buffer;
1358 }
1359
1360 if (tz) {
1361 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1362 if (r < 0)
1363 return r;
1364 }
1365 }
1366 if (!sd_dhcp_server_is_running(link->dhcp_server)) {
1367 r = sd_dhcp_server_start(link->dhcp_server);
1368 if (r < 0) {
1369 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1370
1371 link_enter_failed(link);
1372
1373 return 0;
1374 }
1375 }
1376
1377 log_link_debug(link, "Offering DHCPv4 leases");
1378 }
1379
1380 if (link->address_messages == 0) {
1381 link->addresses_configured = true;
1382 link_check_ready(link);
1383 } else
1384 log_link_debug(link, "Setting addresses");
1385
1386 return 0;
1387 }
1388
1389 static int link_set_bridge_vlan(Link *link) {
1390 int r = 0;
1391
1392 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1393 if (r < 0)
1394 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1395
1396 return r;
1397 }
1398
1399 static int link_set_proxy_arp(Link *link) {
1400 int r;
1401
1402 if (!link_proxy_arp_enabled(link))
1403 return 0;
1404
1405 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1406 if (r < 0)
1407 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1408
1409 return 0;
1410 }
1411
1412 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1413 int r;
1414
1415 assert(link);
1416
1417 log_link_debug(link, "Set link");
1418
1419 r = sd_netlink_message_get_errno(m);
1420 if (r < 0 && r != -EEXIST) {
1421 log_link_error_errno(link, r, "Could not join netdev: %m");
1422 link_enter_failed(link);
1423 }
1424
1425 return 1;
1426 }
1427
1428 static int link_configure_after_setting_mtu(Link *link);
1429
1430 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1431 int r;
1432
1433 assert(m);
1434 assert(link);
1435 assert(link->ifname);
1436
1437 link->setting_mtu = false;
1438
1439 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1440 return 1;
1441
1442 r = sd_netlink_message_get_errno(m);
1443 if (r < 0) {
1444 log_link_warning_errno(link, r, "Could not set MTU: %m");
1445 return 1;
1446 }
1447
1448 log_link_debug(link, "Setting MTU done.");
1449
1450 if (link->state == LINK_STATE_INITIALIZED)
1451 (void) link_configure_after_setting_mtu(link);
1452
1453 return 1;
1454 }
1455
1456 int link_set_mtu(Link *link, uint32_t mtu, bool force) {
1457 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1458 int r;
1459
1460 assert(link);
1461 assert(link->manager);
1462 assert(link->manager->rtnl);
1463
1464 if (mtu == 0 || link->setting_mtu)
1465 return 0;
1466
1467 if (force ? link->mtu == mtu : link->mtu >= mtu)
1468 return 0;
1469
1470 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1471
1472 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1473 if (r < 0)
1474 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1475
1476 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1477 * for this interface, then disable IPv6 else enable it. */
1478 (void) link_enable_ipv6(link);
1479
1480 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1481 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1482 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1483
1484 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1485 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1486
1487 mtu = IPV6_MIN_MTU;
1488 }
1489
1490 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1491 if (r < 0)
1492 return log_link_error_errno(link, r, "Could not append MTU: %m");
1493
1494 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1495 link_netlink_destroy_callback, link);
1496 if (r < 0)
1497 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1498
1499 link_ref(link);
1500 link->setting_mtu = true;
1501
1502 return 0;
1503 }
1504
1505 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1506 int r;
1507
1508 assert(m);
1509 assert(link);
1510 assert(link->ifname);
1511
1512 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1513 return 1;
1514
1515 r = sd_netlink_message_get_errno(m);
1516 if (r < 0)
1517 log_link_warning_errno(link, r, "Could not set link flags: %m");
1518
1519 return 1;
1520 }
1521
1522 static int link_set_flags(Link *link) {
1523 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1524 unsigned ifi_change = 0;
1525 unsigned ifi_flags = 0;
1526 int r;
1527
1528 assert(link);
1529 assert(link->manager);
1530 assert(link->manager->rtnl);
1531
1532 if (link->flags & IFF_LOOPBACK)
1533 return 0;
1534
1535 if (!link->network)
1536 return 0;
1537
1538 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1539 return 0;
1540
1541 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1542 if (r < 0)
1543 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1544
1545 if (link->network->arp >= 0) {
1546 ifi_change |= IFF_NOARP;
1547 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1548 }
1549
1550 if (link->network->multicast >= 0) {
1551 ifi_change |= IFF_MULTICAST;
1552 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1553 }
1554
1555 if (link->network->allmulticast >= 0) {
1556 ifi_change |= IFF_ALLMULTI;
1557 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1558 }
1559
1560 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1561 if (r < 0)
1562 return log_link_error_errno(link, r, "Could not set link flags: %m");
1563
1564 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1565 link_netlink_destroy_callback, link);
1566 if (r < 0)
1567 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1568
1569 link_ref(link);
1570
1571 return 0;
1572 }
1573
1574 static int link_set_bridge(Link *link) {
1575 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1576 int r;
1577
1578 assert(link);
1579 assert(link->network);
1580
1581 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1582 if (r < 0)
1583 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1584
1585 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1586 if (r < 0)
1587 return log_link_error_errno(link, r, "Could not set message family: %m");
1588
1589 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1590 if (r < 0)
1591 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1592
1593 if (link->network->use_bpdu >= 0) {
1594 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
1595 if (r < 0)
1596 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1597 }
1598
1599 if (link->network->hairpin >= 0) {
1600 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1601 if (r < 0)
1602 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1603 }
1604
1605 if (link->network->fast_leave >= 0) {
1606 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1607 if (r < 0)
1608 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1609 }
1610
1611 if (link->network->allow_port_to_be_root >= 0) {
1612 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
1613 if (r < 0)
1614 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1615
1616 }
1617
1618 if (link->network->unicast_flood >= 0) {
1619 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1620 if (r < 0)
1621 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1622 }
1623
1624 if (link->network->multicast_flood >= 0) {
1625 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_FLOOD, link->network->multicast_flood);
1626 if (r < 0)
1627 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_FLOOD attribute: %m");
1628 }
1629
1630 if (link->network->multicast_to_unicast >= 0) {
1631 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_TO_UCAST, link->network->multicast_to_unicast);
1632 if (r < 0)
1633 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_TO_UCAST attribute: %m");
1634 }
1635
1636 if (link->network->neighbor_suppression >= 0) {
1637 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_NEIGH_SUPPRESS, link->network->neighbor_suppression);
1638 if (r < 0)
1639 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_NEIGH_SUPPRESS attribute: %m");
1640 }
1641
1642 if (link->network->learning >= 0) {
1643 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_LEARNING, link->network->learning);
1644 if (r < 0)
1645 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_LEARNING attribute: %m");
1646 }
1647
1648 if (link->network->cost != 0) {
1649 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1650 if (r < 0)
1651 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1652 }
1653
1654 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1655 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1656 if (r < 0)
1657 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1658 }
1659
1660 r = sd_netlink_message_close_container(req);
1661 if (r < 0)
1662 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1663
1664 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_handler,
1665 link_netlink_destroy_callback, link);
1666 if (r < 0)
1667 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1668
1669 link_ref(link);
1670
1671 return r;
1672 }
1673
1674 static int link_set_bond_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1675 int r;
1676
1677 assert(m);
1678 assert(link);
1679 assert(link->ifname);
1680
1681 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1682 return 1;
1683
1684 r = sd_netlink_message_get_errno(m);
1685 if (r < 0) {
1686 log_link_warning_errno(link, r, "Could not set bonding interface: %m");
1687 return 1;
1688 }
1689
1690 return 1;
1691 }
1692
1693 static int link_set_bond(Link *link) {
1694 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1695 int r;
1696
1697 assert(link);
1698 assert(link->network);
1699
1700 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1701 if (r < 0)
1702 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1703
1704 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1705 if (r < 0)
1706 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1707
1708 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1709 if (r < 0)
1710 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1711
1712 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1713 if (r < 0)
1714 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1715
1716 if (link->network->active_slave) {
1717 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1718 if (r < 0)
1719 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1720 }
1721
1722 if (link->network->primary_slave) {
1723 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1724 if (r < 0)
1725 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1726 }
1727
1728 r = sd_netlink_message_close_container(req);
1729 if (r < 0)
1730 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1731
1732 r = sd_netlink_message_close_container(req);
1733 if (r < 0)
1734 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1735
1736 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_bond_handler,
1737 link_netlink_destroy_callback, link);
1738 if (r < 0)
1739 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1740
1741 link_ref(link);
1742
1743 return r;
1744 }
1745
1746 static int link_lldp_save(Link *link) {
1747 _cleanup_free_ char *temp_path = NULL;
1748 _cleanup_fclose_ FILE *f = NULL;
1749 sd_lldp_neighbor **l = NULL;
1750 int n = 0, r, i;
1751
1752 assert(link);
1753 assert(link->lldp_file);
1754
1755 if (!link->lldp) {
1756 (void) unlink(link->lldp_file);
1757 return 0;
1758 }
1759
1760 r = sd_lldp_get_neighbors(link->lldp, &l);
1761 if (r < 0)
1762 goto finish;
1763 if (r == 0) {
1764 (void) unlink(link->lldp_file);
1765 goto finish;
1766 }
1767
1768 n = r;
1769
1770 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1771 if (r < 0)
1772 goto finish;
1773
1774 fchmod(fileno(f), 0644);
1775
1776 for (i = 0; i < n; i++) {
1777 const void *p;
1778 le64_t u;
1779 size_t sz;
1780
1781 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1782 if (r < 0)
1783 goto finish;
1784
1785 u = htole64(sz);
1786 (void) fwrite(&u, 1, sizeof(u), f);
1787 (void) fwrite(p, 1, sz, f);
1788 }
1789
1790 r = fflush_and_check(f);
1791 if (r < 0)
1792 goto finish;
1793
1794 if (rename(temp_path, link->lldp_file) < 0) {
1795 r = -errno;
1796 goto finish;
1797 }
1798
1799 finish:
1800 if (r < 0) {
1801 (void) unlink(link->lldp_file);
1802 if (temp_path)
1803 (void) unlink(temp_path);
1804
1805 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1806 }
1807
1808 if (l) {
1809 for (i = 0; i < n; i++)
1810 sd_lldp_neighbor_unref(l[i]);
1811 free(l);
1812 }
1813
1814 return r;
1815 }
1816
1817 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1818 Link *link = userdata;
1819 int r;
1820
1821 assert(link);
1822
1823 (void) link_lldp_save(link);
1824
1825 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1826 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1827
1828 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1829
1830 r = link_lldp_emit_start(link);
1831 if (r < 0)
1832 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1833 }
1834 }
1835
1836 static int link_acquire_ipv6_conf(Link *link) {
1837 int r;
1838
1839 assert(link);
1840
1841 if (link_ipv6_accept_ra_enabled(link)) {
1842 assert(link->ndisc);
1843
1844 log_link_debug(link, "Discovering IPv6 routers");
1845
1846 r = sd_ndisc_start(link->ndisc);
1847 if (r < 0 && r != -EBUSY)
1848 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1849 }
1850
1851 if (link_radv_enabled(link)) {
1852 assert(link->radv);
1853 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1854
1855 log_link_debug(link, "Starting IPv6 Router Advertisements");
1856
1857 r = sd_radv_start(link->radv);
1858 if (r < 0 && r != -EBUSY)
1859 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1860 }
1861
1862 (void) dhcp6_request_prefix_delegation(link);
1863
1864 return 0;
1865 }
1866
1867 static int link_acquire_ipv4_conf(Link *link) {
1868 int r;
1869
1870 assert(link);
1871 assert(link->manager);
1872 assert(link->manager->event);
1873
1874 if (link_ipv4ll_enabled(link)) {
1875 assert(link->ipv4ll);
1876
1877 log_link_debug(link, "Acquiring IPv4 link-local address");
1878
1879 r = sd_ipv4ll_start(link->ipv4ll);
1880 if (r < 0)
1881 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1882 }
1883
1884 if (link_dhcp4_enabled(link)) {
1885 assert(link->dhcp_client);
1886
1887 log_link_debug(link, "Acquiring DHCPv4 lease");
1888
1889 r = sd_dhcp_client_start(link->dhcp_client);
1890 if (r < 0)
1891 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1892 }
1893
1894 return 0;
1895 }
1896
1897 static int link_acquire_conf(Link *link) {
1898 int r;
1899
1900 assert(link);
1901
1902 r = link_acquire_ipv4_conf(link);
1903 if (r < 0)
1904 return r;
1905
1906 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1907 r = link_acquire_ipv6_conf(link);
1908 if (r < 0)
1909 return r;
1910 }
1911
1912 if (link_lldp_emit_enabled(link)) {
1913 r = link_lldp_emit_start(link);
1914 if (r < 0)
1915 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1916 }
1917
1918 return 0;
1919 }
1920
1921 bool link_has_carrier(Link *link) {
1922 /* see Documentation/networking/operstates.txt in the kernel sources */
1923
1924 if (link->kernel_operstate == IF_OPER_UP)
1925 return true;
1926
1927 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1928 /* operstate may not be implemented, so fall back to flags */
1929 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1930 return true;
1931
1932 return false;
1933 }
1934
1935 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1936 int r;
1937
1938 assert(link);
1939
1940 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1941 return 1;
1942
1943 r = sd_netlink_message_get_errno(m);
1944 if (r < 0)
1945 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1946
1947 return 1;
1948 }
1949
1950 static int link_configure_addrgen_mode(Link *link) {
1951 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1952 uint8_t ipv6ll_mode;
1953 int r;
1954
1955 assert(link);
1956 assert(link->network);
1957 assert(link->manager);
1958 assert(link->manager->rtnl);
1959
1960 log_link_debug(link, "Setting address genmode for link");
1961
1962 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1963 if (r < 0)
1964 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1965
1966 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1967 if (r < 0)
1968 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1969
1970 r = sd_netlink_message_open_container(req, AF_INET6);
1971 if (r < 0)
1972 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1973
1974 if (!link_ipv6ll_enabled(link))
1975 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1976 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1977 /* The file may not exist. And event if it exists, when stable_secret is unset,
1978 * reading the file fails with EIO. */
1979 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1980 else
1981 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1982
1983 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1984 if (r < 0)
1985 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1986
1987 r = sd_netlink_message_close_container(req);
1988 if (r < 0)
1989 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1990
1991 r = sd_netlink_message_close_container(req);
1992 if (r < 0)
1993 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1994
1995 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1996 link_netlink_destroy_callback, link);
1997 if (r < 0)
1998 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1999
2000 link_ref(link);
2001
2002 return 0;
2003 }
2004
2005 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2006 int r;
2007
2008 assert(link);
2009
2010 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2011 return 1;
2012
2013 r = sd_netlink_message_get_errno(m);
2014 if (r < 0)
2015 /* we warn but don't fail the link, as it may be brought up later */
2016 log_link_warning_errno(link, r, "Could not bring up interface: %m");
2017
2018 return 1;
2019 }
2020
2021 static int link_up(Link *link) {
2022 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2023 int r;
2024
2025 assert(link);
2026 assert(link->network);
2027 assert(link->manager);
2028 assert(link->manager->rtnl);
2029
2030 log_link_debug(link, "Bringing link up");
2031
2032 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2033 if (r < 0)
2034 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2035
2036 /* set it free if not enslaved with networkd */
2037 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
2038 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
2039 if (r < 0)
2040 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
2041 }
2042
2043 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
2044 if (r < 0)
2045 return log_link_error_errno(link, r, "Could not set link flags: %m");
2046
2047 if (link->network->mac) {
2048 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
2049 if (r < 0)
2050 return log_link_error_errno(link, r, "Could not set MAC address: %m");
2051 }
2052
2053 if (link_ipv6_enabled(link)) {
2054 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
2055 if (r < 0)
2056 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
2057
2058 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
2059 r = sd_netlink_message_open_container(req, AF_INET6);
2060 if (r < 0)
2061 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
2062
2063 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
2064 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
2065 if (r < 0)
2066 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
2067 }
2068
2069 r = sd_netlink_message_close_container(req);
2070 if (r < 0)
2071 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
2072
2073 r = sd_netlink_message_close_container(req);
2074 if (r < 0)
2075 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
2076 }
2077
2078 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2079 link_netlink_destroy_callback, link);
2080 if (r < 0)
2081 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2082
2083 link_ref(link);
2084
2085 return 0;
2086 }
2087
2088 static int link_up_can(Link *link) {
2089 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2090 int r;
2091
2092 assert(link);
2093
2094 log_link_debug(link, "Bringing CAN link up");
2095
2096 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2097 if (r < 0)
2098 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2099
2100 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
2101 if (r < 0)
2102 return log_link_error_errno(link, r, "Could not set link flags: %m");
2103
2104 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2105 link_netlink_destroy_callback, link);
2106 if (r < 0)
2107 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2108
2109 link_ref(link);
2110
2111 return 0;
2112 }
2113
2114 static int link_set_can(Link *link) {
2115 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
2116 int r;
2117
2118 assert(link);
2119 assert(link->network);
2120 assert(link->manager);
2121 assert(link->manager->rtnl);
2122
2123 log_link_debug(link, "link_set_can");
2124
2125 r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
2126 if (r < 0)
2127 return log_link_error_errno(link, r, "Failed to allocate netlink message: %m");
2128
2129 r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
2130 if (r < 0)
2131 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
2132
2133 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
2134 if (r < 0)
2135 return log_link_error_errno(link, r, "Failed to open netlink container: %m");
2136
2137 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
2138 if (r < 0)
2139 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
2140
2141 if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) {
2142 struct can_bittiming bt = {
2143 .bitrate = link->network->can_bitrate,
2144 .sample_point = link->network->can_sample_point,
2145 };
2146
2147 if (link->network->can_bitrate > UINT32_MAX) {
2148 log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate);
2149 return -ERANGE;
2150 }
2151
2152 log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate);
2153 if (link->network->can_sample_point > 0)
2154 log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
2155 else
2156 log_link_debug(link, "Using default sample point");
2157
2158 r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
2159 if (r < 0)
2160 return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
2161 }
2162
2163 if (link->network->can_restart_us > 0) {
2164 char time_string[FORMAT_TIMESPAN_MAX];
2165 uint64_t restart_ms;
2166
2167 if (link->network->can_restart_us == USEC_INFINITY)
2168 restart_ms = 0;
2169 else
2170 restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC);
2171
2172 format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC);
2173
2174 if (restart_ms > UINT32_MAX) {
2175 log_link_error(link, "restart timeout (%s) too big.", time_string);
2176 return -ERANGE;
2177 }
2178
2179 log_link_debug(link, "Setting restart = %s", time_string);
2180
2181 r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
2182 if (r < 0)
2183 return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
2184 }
2185
2186 if (link->network->can_triple_sampling >= 0) {
2187 struct can_ctrlmode cm = {
2188 .mask = CAN_CTRLMODE_3_SAMPLES,
2189 .flags = link->network->can_triple_sampling ? CAN_CTRLMODE_3_SAMPLES : 0,
2190 };
2191
2192 log_link_debug(link, "%sabling triple-sampling", link->network->can_triple_sampling ? "En" : "Dis");
2193
2194 r = sd_netlink_message_append_data(m, IFLA_CAN_CTRLMODE, &cm, sizeof(cm));
2195 if (r < 0)
2196 return log_link_error_errno(link, r, "Could not append IFLA_CAN_CTRLMODE attribute: %m");
2197 }
2198
2199 r = sd_netlink_message_close_container(m);
2200 if (r < 0)
2201 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2202
2203 r = sd_netlink_message_close_container(m);
2204 if (r < 0)
2205 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2206
2207 r = netlink_call_async(link->manager->rtnl, NULL, m, link_set_handler,
2208 link_netlink_destroy_callback, link);
2209 if (r < 0)
2210 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2211
2212 link_ref(link);
2213
2214 if (!(link->flags & IFF_UP)) {
2215 r = link_up_can(link);
2216 if (r < 0) {
2217 link_enter_failed(link);
2218 return r;
2219 }
2220 }
2221
2222 log_link_debug(link, "link_set_can done");
2223
2224 return r;
2225 }
2226
2227 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2228 int r;
2229
2230 assert(link);
2231
2232 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2233 return 1;
2234
2235 r = sd_netlink_message_get_errno(m);
2236 if (r < 0)
2237 log_link_warning_errno(link, r, "Could not bring down interface: %m");
2238
2239 if (streq_ptr(link->kind, "can"))
2240 link_set_can(link);
2241
2242 return 1;
2243 }
2244
2245 int link_down(Link *link) {
2246 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2247 int r;
2248
2249 assert(link);
2250 assert(link->manager);
2251 assert(link->manager->rtnl);
2252
2253 log_link_debug(link, "Bringing link down");
2254
2255 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
2256 RTM_SETLINK, link->ifindex);
2257 if (r < 0)
2258 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2259
2260 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
2261 if (r < 0)
2262 return log_link_error_errno(link, r, "Could not set link flags: %m");
2263
2264 r = netlink_call_async(link->manager->rtnl, NULL, req, link_down_handler,
2265 link_netlink_destroy_callback, link);
2266 if (r < 0)
2267 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2268
2269 link_ref(link);
2270
2271 return 0;
2272 }
2273
2274 static int link_handle_bound_to_list(Link *link) {
2275 Link *l;
2276 Iterator i;
2277 int r;
2278 bool required_up = false;
2279 bool link_is_up = false;
2280
2281 assert(link);
2282
2283 if (hashmap_isempty(link->bound_to_links))
2284 return 0;
2285
2286 if (link->flags & IFF_UP)
2287 link_is_up = true;
2288
2289 HASHMAP_FOREACH (l, link->bound_to_links, i)
2290 if (link_has_carrier(l)) {
2291 required_up = true;
2292 break;
2293 }
2294
2295 if (!required_up && link_is_up) {
2296 r = link_down(link);
2297 if (r < 0)
2298 return r;
2299 } else if (required_up && !link_is_up) {
2300 r = link_up(link);
2301 if (r < 0)
2302 return r;
2303 }
2304
2305 return 0;
2306 }
2307
2308 static int link_handle_bound_by_list(Link *link) {
2309 Iterator i;
2310 Link *l;
2311 int r;
2312
2313 assert(link);
2314
2315 if (hashmap_isempty(link->bound_by_links))
2316 return 0;
2317
2318 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2319 r = link_handle_bound_to_list(l);
2320 if (r < 0)
2321 return r;
2322 }
2323
2324 return 0;
2325 }
2326
2327 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2328 int r;
2329
2330 assert(link);
2331 assert(carrier);
2332
2333 if (link == carrier)
2334 return 0;
2335
2336 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2337 return 0;
2338
2339 r = hashmap_ensure_allocated(h, NULL);
2340 if (r < 0)
2341 return r;
2342
2343 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2344 if (r < 0)
2345 return r;
2346
2347 return 0;
2348 }
2349
2350 static int link_new_bound_by_list(Link *link) {
2351 Manager *m;
2352 Link *carrier;
2353 Iterator i;
2354 int r;
2355 bool list_updated = false;
2356
2357 assert(link);
2358 assert(link->manager);
2359
2360 m = link->manager;
2361
2362 HASHMAP_FOREACH(carrier, m->links, i) {
2363 if (!carrier->network)
2364 continue;
2365
2366 if (strv_isempty(carrier->network->bind_carrier))
2367 continue;
2368
2369 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2370 r = link_put_carrier(link, carrier, &link->bound_by_links);
2371 if (r < 0)
2372 return r;
2373
2374 list_updated = true;
2375 }
2376 }
2377
2378 if (list_updated)
2379 link_dirty(link);
2380
2381 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2382 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2383 if (r < 0)
2384 return r;
2385
2386 link_dirty(carrier);
2387 }
2388
2389 return 0;
2390 }
2391
2392 static int link_new_bound_to_list(Link *link) {
2393 Manager *m;
2394 Link *carrier;
2395 Iterator i;
2396 int r;
2397 bool list_updated = false;
2398
2399 assert(link);
2400 assert(link->manager);
2401
2402 if (!link->network)
2403 return 0;
2404
2405 if (strv_isempty(link->network->bind_carrier))
2406 return 0;
2407
2408 m = link->manager;
2409
2410 HASHMAP_FOREACH (carrier, m->links, i) {
2411 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2412 r = link_put_carrier(link, carrier, &link->bound_to_links);
2413 if (r < 0)
2414 return r;
2415
2416 list_updated = true;
2417 }
2418 }
2419
2420 if (list_updated)
2421 link_dirty(link);
2422
2423 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2424 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2425 if (r < 0)
2426 return r;
2427
2428 link_dirty(carrier);
2429 }
2430
2431 return 0;
2432 }
2433
2434 static int link_new_carrier_maps(Link *link) {
2435 int r;
2436
2437 r = link_new_bound_by_list(link);
2438 if (r < 0)
2439 return r;
2440
2441 r = link_handle_bound_by_list(link);
2442 if (r < 0)
2443 return r;
2444
2445 r = link_new_bound_to_list(link);
2446 if (r < 0)
2447 return r;
2448
2449 r = link_handle_bound_to_list(link);
2450 if (r < 0)
2451 return r;
2452
2453 return 0;
2454 }
2455
2456 static void link_free_bound_to_list(Link *link) {
2457 Link *bound_to;
2458 Iterator i;
2459
2460 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2461 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2462
2463 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2464 link_dirty(bound_to);
2465 }
2466
2467 return;
2468 }
2469
2470 static void link_free_bound_by_list(Link *link) {
2471 Link *bound_by;
2472 Iterator i;
2473
2474 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2475 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2476
2477 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2478 link_dirty(bound_by);
2479 link_handle_bound_to_list(bound_by);
2480 }
2481 }
2482
2483 return;
2484 }
2485
2486 static void link_free_carrier_maps(Link *link) {
2487 bool list_updated = false;
2488
2489 assert(link);
2490
2491 if (!hashmap_isempty(link->bound_to_links)) {
2492 link_free_bound_to_list(link);
2493 list_updated = true;
2494 }
2495
2496 if (!hashmap_isempty(link->bound_by_links)) {
2497 link_free_bound_by_list(link);
2498 list_updated = true;
2499 }
2500
2501 if (list_updated)
2502 link_dirty(link);
2503
2504 return;
2505 }
2506
2507 static int link_append_to_master(Link *link, NetDev *netdev) {
2508 Link *master;
2509 int r;
2510
2511 assert(link);
2512 assert(netdev);
2513
2514 r = link_get(link->manager, netdev->ifindex, &master);
2515 if (r < 0)
2516 return r;
2517
2518 r = set_ensure_allocated(&master->slaves, NULL);
2519 if (r < 0)
2520 return r;
2521
2522 r = set_put(master->slaves, link);
2523 if (r < 0)
2524 return r;
2525
2526 link_ref(link);
2527 return 0;
2528 }
2529
2530 static void link_drop_from_master(Link *link, NetDev *netdev) {
2531 Link *master;
2532
2533 assert(link);
2534
2535 if (!link->manager || !netdev)
2536 return;
2537
2538 if (link_get(link->manager, netdev->ifindex, &master) < 0)
2539 return;
2540
2541 link_unref(set_remove(master->slaves, link));
2542 }
2543
2544 static void link_detach_from_manager(Link *link) {
2545 if (!link || !link->manager)
2546 return;
2547
2548 link_unref(set_remove(link->manager->links_requesting_uuid, link));
2549 link_clean(link);
2550
2551 /* The following must be called at last. */
2552 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2553 link_unref(link);
2554 }
2555
2556 void link_drop(Link *link) {
2557 if (!link || link->state == LINK_STATE_LINGER)
2558 return;
2559
2560 link_set_state(link, LINK_STATE_LINGER);
2561
2562 link_free_carrier_maps(link);
2563
2564 if (link->network) {
2565 link_drop_from_master(link, link->network->bridge);
2566 link_drop_from_master(link, link->network->bond);
2567 }
2568
2569 log_link_debug(link, "Link removed");
2570
2571 (void) unlink(link->state_file);
2572 link_detach_from_manager(link);
2573 }
2574
2575 static int link_joined(Link *link) {
2576 int r;
2577
2578 assert(link);
2579 assert(link->network);
2580
2581 if (!hashmap_isempty(link->bound_to_links)) {
2582 r = link_handle_bound_to_list(link);
2583 if (r < 0)
2584 return r;
2585 } else if (!(link->flags & IFF_UP)) {
2586 r = link_up(link);
2587 if (r < 0) {
2588 link_enter_failed(link);
2589 return r;
2590 }
2591 }
2592
2593 if (link->network->bridge) {
2594 r = link_set_bridge(link);
2595 if (r < 0)
2596 log_link_error_errno(link, r, "Could not set bridge message: %m");
2597
2598 r = link_append_to_master(link, link->network->bridge);
2599 if (r < 0)
2600 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2601 }
2602
2603 if (link->network->bond) {
2604 r = link_set_bond(link);
2605 if (r < 0)
2606 log_link_error_errno(link, r, "Could not set bond message: %m");
2607
2608 r = link_append_to_master(link, link->network->bond);
2609 if (r < 0)
2610 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2611 }
2612
2613 if (link->network->use_br_vlan &&
2614 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2615 r = link_set_bridge_vlan(link);
2616 if (r < 0)
2617 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2618 }
2619
2620 /* Skip setting up addresses until it gets carrier,
2621 or it would try to set addresses twice,
2622 which is bad for non-idempotent steps. */
2623 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2624 return 0;
2625
2626 return link_request_set_addresses(link);
2627 }
2628
2629 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2630 int r;
2631
2632 assert(link);
2633 assert(link->network);
2634 assert(link->enslaving > 0);
2635 assert(!link->enslaved_raw);
2636
2637 link->enslaving--;
2638
2639 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2640 return 1;
2641
2642 r = sd_netlink_message_get_errno(m);
2643 if (r < 0 && r != -EEXIST) {
2644 log_link_error_errno(link, r, "Could not join netdev: %m");
2645 link_enter_failed(link);
2646 return 1;
2647 } else
2648 log_link_debug(link, "Joined netdev");
2649
2650 if (link->enslaving == 0) {
2651 link->enslaved_raw = true;
2652 link_joined(link);
2653 }
2654
2655 return 1;
2656 }
2657
2658 static int link_enter_join_netdev(Link *link) {
2659 NetDev *netdev;
2660 Iterator i;
2661 int r;
2662
2663 assert(link);
2664 assert(link->network);
2665 assert(link->state == LINK_STATE_INITIALIZED);
2666
2667 link_set_state(link, LINK_STATE_CONFIGURING);
2668
2669 link_dirty(link);
2670 link->enslaving = 0;
2671 link->enslaved_raw = false;
2672
2673 if (link->network->bond) {
2674 if (link->network->bond->state == NETDEV_STATE_READY &&
2675 link->network->bond->ifindex == link->master_ifindex)
2676 return link_joined(link);
2677
2678 log_struct(LOG_DEBUG,
2679 LOG_LINK_INTERFACE(link),
2680 LOG_NETDEV_INTERFACE(link->network->bond),
2681 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2682
2683 link->enslaving++;
2684
2685 r = netdev_join(link->network->bond, link, netdev_join_handler);
2686 if (r < 0) {
2687 log_struct_errno(LOG_WARNING, r,
2688 LOG_LINK_INTERFACE(link),
2689 LOG_NETDEV_INTERFACE(link->network->bond),
2690 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2691 link_enter_failed(link);
2692 return r;
2693 }
2694 }
2695
2696 if (link->network->bridge) {
2697 log_struct(LOG_DEBUG,
2698 LOG_LINK_INTERFACE(link),
2699 LOG_NETDEV_INTERFACE(link->network->bridge),
2700 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2701
2702 link->enslaving++;
2703
2704 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2705 if (r < 0) {
2706 log_struct_errno(LOG_WARNING, r,
2707 LOG_LINK_INTERFACE(link),
2708 LOG_NETDEV_INTERFACE(link->network->bridge),
2709 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2710 link_enter_failed(link);
2711 return r;
2712 }
2713 }
2714
2715 if (link->network->vrf) {
2716 log_struct(LOG_DEBUG,
2717 LOG_LINK_INTERFACE(link),
2718 LOG_NETDEV_INTERFACE(link->network->vrf),
2719 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2720
2721 link->enslaving++;
2722
2723 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2724 if (r < 0) {
2725 log_struct_errno(LOG_WARNING, r,
2726 LOG_LINK_INTERFACE(link),
2727 LOG_NETDEV_INTERFACE(link->network->vrf),
2728 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2729 link_enter_failed(link);
2730 return r;
2731 }
2732 }
2733
2734 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2735
2736 if (netdev->ifindex > 0)
2737 /* Assume already enslaved. */
2738 continue;
2739
2740 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2741 continue;
2742
2743 log_struct(LOG_DEBUG,
2744 LOG_LINK_INTERFACE(link),
2745 LOG_NETDEV_INTERFACE(netdev),
2746 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2747
2748 link->enslaving++;
2749
2750 r = netdev_join(netdev, link, netdev_join_handler);
2751 if (r < 0) {
2752 log_struct_errno(LOG_WARNING, r,
2753 LOG_LINK_INTERFACE(link),
2754 LOG_NETDEV_INTERFACE(netdev),
2755 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2756 link_enter_failed(link);
2757 return r;
2758 }
2759 }
2760
2761 if (link->enslaving == 0)
2762 return link_joined(link);
2763
2764 return 0;
2765 }
2766
2767 static int link_set_ipv4_forward(Link *link) {
2768 int r;
2769
2770 if (!link_ipv4_forward_enabled(link))
2771 return 0;
2772
2773 /* We propagate the forwarding flag from one interface to the
2774 * global setting one way. This means: as long as at least one
2775 * interface was configured at any time that had IP forwarding
2776 * enabled the setting will stay on for good. We do this
2777 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2778 * somewhat in sync (see below). */
2779
2780 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2781 if (r < 0)
2782 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2783
2784 return 0;
2785 }
2786
2787 static int link_set_ipv6_forward(Link *link) {
2788 int r;
2789
2790 if (!link_ipv6_forward_enabled(link))
2791 return 0;
2792
2793 /* On Linux, the IPv6 stack does not know a per-interface
2794 * packet forwarding setting: either packet forwarding is on
2795 * for all, or off for all. We hence don't bother with a
2796 * per-interface setting, but simply propagate the interface
2797 * flag, if it is set, to the global flag, one-way. Note that
2798 * while IPv4 would allow a per-interface flag, we expose the
2799 * same behaviour there and also propagate the setting from
2800 * one to all, to keep things simple (see above). */
2801
2802 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2803 if (r < 0)
2804 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2805
2806 return 0;
2807 }
2808
2809 static int link_set_ipv6_privacy_extensions(Link *link) {
2810 IPv6PrivacyExtensions s;
2811 int r;
2812
2813 s = link_ipv6_privacy_extensions(link);
2814 if (s < 0)
2815 return 0;
2816
2817 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2818 if (r < 0)
2819 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2820
2821 return 0;
2822 }
2823
2824 static int link_set_ipv6_accept_ra(Link *link) {
2825 int r;
2826
2827 /* Make this a NOP if IPv6 is not available */
2828 if (!socket_ipv6_is_supported())
2829 return 0;
2830
2831 if (link->flags & IFF_LOOPBACK)
2832 return 0;
2833
2834 if (!link->network)
2835 return 0;
2836
2837 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2838 if (r < 0)
2839 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2840
2841 return 0;
2842 }
2843
2844 static int link_set_ipv6_dad_transmits(Link *link) {
2845 int r;
2846
2847 /* Make this a NOP if IPv6 is not available */
2848 if (!socket_ipv6_is_supported())
2849 return 0;
2850
2851 if (link->flags & IFF_LOOPBACK)
2852 return 0;
2853
2854 if (!link->network)
2855 return 0;
2856
2857 if (link->network->ipv6_dad_transmits < 0)
2858 return 0;
2859
2860 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2861 if (r < 0)
2862 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2863
2864 return 0;
2865 }
2866
2867 static int link_set_ipv6_hop_limit(Link *link) {
2868 int r;
2869
2870 /* Make this a NOP if IPv6 is not available */
2871 if (!socket_ipv6_is_supported())
2872 return 0;
2873
2874 if (link->flags & IFF_LOOPBACK)
2875 return 0;
2876
2877 if (!link->network)
2878 return 0;
2879
2880 if (link->network->ipv6_hop_limit < 0)
2881 return 0;
2882
2883 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2884 if (r < 0)
2885 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2886
2887 return 0;
2888 }
2889
2890 static int link_set_ipv6_mtu(Link *link) {
2891 int r;
2892
2893 /* Make this a NOP if IPv6 is not available */
2894 if (!socket_ipv6_is_supported())
2895 return 0;
2896
2897 if (link->flags & IFF_LOOPBACK)
2898 return 0;
2899
2900 if (link->network->ipv6_mtu == 0)
2901 return 0;
2902
2903 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2904 if (r < 0)
2905 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2906
2907 return 0;
2908 }
2909
2910 static bool link_is_static_address_configured(Link *link, Address *address) {
2911 Address *net_address;
2912
2913 assert(link);
2914 assert(address);
2915
2916 if (!link->network)
2917 return false;
2918
2919 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2920 if (address_equal(net_address, address))
2921 return true;
2922
2923 return false;
2924 }
2925
2926 static bool link_is_static_route_configured(Link *link, Route *route) {
2927 Route *net_route;
2928
2929 assert(link);
2930 assert(route);
2931
2932 if (!link->network)
2933 return false;
2934
2935 LIST_FOREACH(routes, net_route, link->network->static_routes)
2936 if (route_equal(net_route, route))
2937 return true;
2938
2939 return false;
2940 }
2941
2942 static int link_drop_foreign_config(Link *link) {
2943 Address *address;
2944 Route *route;
2945 Iterator i;
2946 int r;
2947
2948 SET_FOREACH(address, link->addresses_foreign, i) {
2949 /* we consider IPv6LL addresses to be managed by the kernel */
2950 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2951 continue;
2952
2953 if (link_is_static_address_configured(link, address)) {
2954 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2955 if (r < 0)
2956 return log_link_error_errno(link, r, "Failed to add address: %m");
2957 } else {
2958 r = address_remove(address, link, NULL);
2959 if (r < 0)
2960 return r;
2961 }
2962 }
2963
2964 SET_FOREACH(route, link->routes_foreign, i) {
2965 /* do not touch routes managed by the kernel */
2966 if (route->protocol == RTPROT_KERNEL)
2967 continue;
2968
2969 if (link_is_static_route_configured(link, route)) {
2970 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2971 if (r < 0)
2972 return r;
2973 } else {
2974 r = route_remove(route, link, NULL);
2975 if (r < 0)
2976 return r;
2977 }
2978 }
2979
2980 return 0;
2981 }
2982
2983 static int link_drop_config(Link *link) {
2984 Address *address, *pool_address;
2985 Route *route;
2986 Iterator i;
2987 int r;
2988
2989 SET_FOREACH(address, link->addresses, i) {
2990 /* we consider IPv6LL addresses to be managed by the kernel */
2991 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2992 continue;
2993
2994 r = address_remove(address, link, NULL);
2995 if (r < 0)
2996 return r;
2997
2998 /* If this address came from an address pool, clean up the pool */
2999 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
3000 if (address_equal(address, pool_address)) {
3001 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
3002 address_free(pool_address);
3003 break;
3004 }
3005 }
3006 }
3007
3008 SET_FOREACH(route, link->routes, i) {
3009 /* do not touch routes managed by the kernel */
3010 if (route->protocol == RTPROT_KERNEL)
3011 continue;
3012
3013 r = route_remove(route, link, NULL);
3014 if (r < 0)
3015 return r;
3016 }
3017
3018 ndisc_flush(link);
3019
3020 return 0;
3021 }
3022
3023 static int link_update_lldp(Link *link) {
3024 int r;
3025
3026 assert(link);
3027
3028 if (!link->lldp)
3029 return 0;
3030
3031 if (link->flags & IFF_UP) {
3032 r = sd_lldp_start(link->lldp);
3033 if (r > 0)
3034 log_link_debug(link, "Started LLDP.");
3035 } else {
3036 r = sd_lldp_stop(link->lldp);
3037 if (r > 0)
3038 log_link_debug(link, "Stopped LLDP.");
3039 }
3040
3041 return r;
3042 }
3043
3044 static int link_configure_can(Link *link) {
3045 int r;
3046
3047 if (streq_ptr(link->kind, "can")) {
3048 /* The CAN interface must be down to configure bitrate, etc... */
3049 if ((link->flags & IFF_UP)) {
3050 r = link_down(link);
3051 if (r < 0) {
3052 link_enter_failed(link);
3053 return r;
3054 }
3055
3056 return 0;
3057 }
3058
3059 return link_set_can(link);
3060 }
3061
3062 if (!(link->flags & IFF_UP)) {
3063 r = link_up_can(link);
3064 if (r < 0) {
3065 link_enter_failed(link);
3066 return r;
3067 }
3068 }
3069
3070 return 0;
3071 }
3072
3073 static int link_configure(Link *link) {
3074 int r;
3075
3076 assert(link);
3077 assert(link->network);
3078 assert(link->state == LINK_STATE_INITIALIZED);
3079
3080 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
3081 return link_configure_can(link);
3082
3083 /* Drop foreign config, but ignore loopback or critical devices.
3084 * We do not want to remove loopback address or addresses used for root NFS. */
3085 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
3086 r = link_drop_foreign_config(link);
3087 if (r < 0)
3088 return r;
3089 }
3090
3091 r = link_set_proxy_arp(link);
3092 if (r < 0)
3093 return r;
3094
3095 r = ipv6_proxy_ndp_addresses_configure(link);
3096 if (r < 0)
3097 return r;
3098
3099 r = link_set_ipv4_forward(link);
3100 if (r < 0)
3101 return r;
3102
3103 r = link_set_ipv6_forward(link);
3104 if (r < 0)
3105 return r;
3106
3107 r = link_set_ipv6_privacy_extensions(link);
3108 if (r < 0)
3109 return r;
3110
3111 r = link_set_ipv6_accept_ra(link);
3112 if (r < 0)
3113 return r;
3114
3115 r = link_set_ipv6_dad_transmits(link);
3116 if (r < 0)
3117 return r;
3118
3119 r = link_set_ipv6_hop_limit(link);
3120 if (r < 0)
3121 return r;
3122
3123 r = link_set_flags(link);
3124 if (r < 0)
3125 return r;
3126
3127 r = link_set_ipv6_mtu(link);
3128 if (r < 0)
3129 return r;
3130
3131 if (link_ipv4ll_enabled(link) || link_ipv4ll_fallback_enabled(link)) {
3132 r = ipv4ll_configure(link);
3133 if (r < 0)
3134 return r;
3135 }
3136
3137 if (link_dhcp4_enabled(link)) {
3138 r = dhcp4_set_promote_secondaries(link);
3139 if (r < 0)
3140 return r;
3141
3142 r = dhcp4_configure(link);
3143 if (r < 0)
3144 return r;
3145 }
3146
3147 if (link_dhcp4_server_enabled(link)) {
3148 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
3149 if (r < 0)
3150 return r;
3151
3152 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
3153 if (r < 0)
3154 return r;
3155 }
3156
3157 if (link_dhcp6_enabled(link) ||
3158 link_ipv6_accept_ra_enabled(link)) {
3159 r = dhcp6_configure(link);
3160 if (r < 0)
3161 return r;
3162 }
3163
3164 if (link_ipv6_accept_ra_enabled(link)) {
3165 r = ndisc_configure(link);
3166 if (r < 0)
3167 return r;
3168 }
3169
3170 if (link_radv_enabled(link)) {
3171 r = radv_configure(link);
3172 if (r < 0)
3173 return r;
3174 }
3175
3176 if (link_lldp_rx_enabled(link)) {
3177 r = sd_lldp_new(&link->lldp);
3178 if (r < 0)
3179 return r;
3180
3181 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
3182 if (r < 0)
3183 return r;
3184
3185 r = sd_lldp_match_capabilities(link->lldp,
3186 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
3187 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
3188 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
3189 if (r < 0)
3190 return r;
3191
3192 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
3193 if (r < 0)
3194 return r;
3195
3196 r = sd_lldp_attach_event(link->lldp, NULL, 0);
3197 if (r < 0)
3198 return r;
3199
3200 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
3201 if (r < 0)
3202 return r;
3203
3204 r = link_update_lldp(link);
3205 if (r < 0)
3206 return r;
3207 }
3208
3209 r = link_set_mtu(link, link->network->mtu, link->network->mtu_is_set);
3210 if (r < 0)
3211 return r;
3212
3213 if (socket_ipv6_is_supported()) {
3214 r = link_configure_addrgen_mode(link);
3215 if (r < 0)
3216 return r;
3217 }
3218
3219 return link_configure_after_setting_mtu(link);
3220 }
3221
3222 static int link_configure_after_setting_mtu(Link *link) {
3223 int r;
3224
3225 assert(link);
3226 assert(link->network);
3227 assert(link->state == LINK_STATE_INITIALIZED);
3228
3229 if (link->setting_mtu)
3230 return 0;
3231
3232 if (link_has_carrier(link) || link->network->configure_without_carrier) {
3233 r = link_acquire_conf(link);
3234 if (r < 0)
3235 return r;
3236 }
3237
3238 return link_enter_join_netdev(link);
3239 }
3240
3241 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3242 assert(duid);
3243
3244 if (duid->raw_data_len > 0)
3245 return 0;
3246
3247 if (duid->type != DUID_TYPE_UUID)
3248 return -EINVAL;
3249
3250 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3251 duid->raw_data_len = sizeof(sd_id128_t);
3252
3253 return 1;
3254 }
3255
3256 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3257 Manager *manager = userdata;
3258 const sd_bus_error *e;
3259 const void *a;
3260 size_t sz;
3261 DUID *duid;
3262 Link *link;
3263 int r;
3264
3265 assert(m);
3266 assert(manager);
3267
3268 e = sd_bus_message_get_error(m);
3269 if (e) {
3270 log_error_errno(sd_bus_error_get_errno(e),
3271 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3272 e->message);
3273 goto configure;
3274 }
3275
3276 r = sd_bus_message_read_array(m, 'y', &a, &sz);
3277 if (r < 0)
3278 goto configure;
3279
3280 if (sz != sizeof(sd_id128_t)) {
3281 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3282 goto configure;
3283 }
3284
3285 memcpy(&manager->product_uuid, a, sz);
3286 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3287 (void) duid_set_uuid(duid, manager->product_uuid);
3288
3289 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3290
3291 configure:
3292 while ((link = set_steal_first(manager->links_requesting_uuid))) {
3293 r = link_configure(link);
3294 if (r < 0)
3295 log_link_error_errno(link, r, "Failed to configure link: %m");
3296 }
3297
3298 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3299
3300 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3301 * even if the method fails. */
3302 manager->has_product_uuid = true;
3303
3304 return 1;
3305 }
3306
3307 static bool link_requires_uuid(Link *link) {
3308 const DUID *duid;
3309
3310 assert(link);
3311 assert(link->manager);
3312 assert(link->network);
3313
3314 duid = link_get_duid(link);
3315 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3316 return false;
3317
3318 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3319 return true;
3320
3321 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3322 return true;
3323
3324 return false;
3325 }
3326
3327 static int link_configure_duid(Link *link) {
3328 Manager *m;
3329 DUID *duid;
3330 int r;
3331
3332 assert(link);
3333 assert(link->manager);
3334 assert(link->network);
3335
3336 m = link->manager;
3337 duid = link_get_duid(link);
3338
3339 if (!link_requires_uuid(link))
3340 return 1;
3341
3342 if (m->has_product_uuid) {
3343 (void) duid_set_uuid(duid, m->product_uuid);
3344 return 1;
3345 }
3346
3347 if (!m->links_requesting_uuid) {
3348 r = manager_request_product_uuid(m, link);
3349 if (r < 0) {
3350 if (r == -ENOMEM)
3351 return r;
3352
3353 log_link_warning_errno(link, r,
3354 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3355 return 1;
3356 }
3357 } else {
3358 r = set_put(m->links_requesting_uuid, link);
3359 if (r < 0)
3360 return log_oom();
3361
3362 r = set_put(m->duids_requesting_uuid, duid);
3363 if (r < 0)
3364 return log_oom();
3365 }
3366
3367 return 0;
3368 }
3369
3370 static int link_initialized_and_synced(Link *link) {
3371 Network *network;
3372 int r;
3373
3374 assert(link);
3375 assert(link->ifname);
3376 assert(link->manager);
3377
3378 /* We may get called either from the asynchronous netlink callback,
3379 * or directly for link_add() if running in a container. See link_add(). */
3380 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3381 return 0;
3382
3383 log_link_debug(link, "Link state is up-to-date");
3384 link_set_state(link, LINK_STATE_INITIALIZED);
3385
3386 r = link_new_bound_by_list(link);
3387 if (r < 0)
3388 return r;
3389
3390 r = link_handle_bound_by_list(link);
3391 if (r < 0)
3392 return r;
3393
3394 if (!link->network) {
3395 r = network_get(link->manager, link->sd_device, link->ifname,
3396 &link->mac, &network);
3397 if (r == -ENOENT) {
3398 link_enter_unmanaged(link);
3399 return 0;
3400 } else if (r == 0 && network->unmanaged) {
3401 link_enter_unmanaged(link);
3402 return 0;
3403 } else if (r < 0)
3404 return r;
3405
3406 if (link->flags & IFF_LOOPBACK) {
3407 if (network->link_local != ADDRESS_FAMILY_NO)
3408 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3409
3410 if (network->dhcp != ADDRESS_FAMILY_NO)
3411 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3412
3413 if (network->dhcp_server)
3414 log_link_debug(link, "Ignoring DHCP server for loopback link");
3415 }
3416
3417 r = network_apply(network, link);
3418 if (r < 0)
3419 return r;
3420 }
3421
3422 r = link_new_bound_to_list(link);
3423 if (r < 0)
3424 return r;
3425
3426 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3427 * link_configure() is called later asynchronously. */
3428 r = link_configure_duid(link);
3429 if (r <= 0)
3430 return r;
3431
3432 r = link_configure(link);
3433 if (r < 0)
3434 return r;
3435
3436 return 0;
3437 }
3438
3439 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3440 (void) link_initialized_and_synced(link);
3441 return 1;
3442 }
3443
3444 int link_initialized(Link *link, sd_device *device) {
3445 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3446 int r;
3447
3448 assert(link);
3449 assert(link->manager);
3450 assert(link->manager->rtnl);
3451 assert(device);
3452
3453 if (link->state != LINK_STATE_PENDING)
3454 return 0;
3455
3456 if (link->sd_device)
3457 return 0;
3458
3459 log_link_debug(link, "udev initialized link");
3460 link_set_state(link, LINK_STATE_INITIALIZED);
3461
3462 link->sd_device = sd_device_ref(device);
3463
3464 /* udev has initialized the link, but we don't know if we have yet
3465 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3466 * when it returns we know that the pending NEWLINKs have already been
3467 * processed and that we are up-to-date */
3468
3469 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3470 link->ifindex);
3471 if (r < 0)
3472 return r;
3473
3474 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3475 link_netlink_destroy_callback, link);
3476 if (r < 0)
3477 return r;
3478
3479 link_ref(link);
3480
3481 return 0;
3482 }
3483
3484 static int link_load(Link *link) {
3485 _cleanup_free_ char *network_file = NULL,
3486 *addresses = NULL,
3487 *routes = NULL,
3488 *dhcp4_address = NULL,
3489 *ipv4ll_address = NULL;
3490 union in_addr_union address;
3491 union in_addr_union route_dst;
3492 const char *p;
3493 int r;
3494
3495 assert(link);
3496
3497 r = parse_env_file(NULL, link->state_file,
3498 "NETWORK_FILE", &network_file,
3499 "ADDRESSES", &addresses,
3500 "ROUTES", &routes,
3501 "DHCP4_ADDRESS", &dhcp4_address,
3502 "IPV4LL_ADDRESS", &ipv4ll_address);
3503 if (r < 0 && r != -ENOENT)
3504 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3505
3506 if (network_file) {
3507 Network *network;
3508 char *suffix;
3509
3510 /* drop suffix */
3511 suffix = strrchr(network_file, '.');
3512 if (!suffix) {
3513 log_link_debug(link, "Failed to get network name from %s", network_file);
3514 goto network_file_fail;
3515 }
3516 *suffix = '\0';
3517
3518 r = network_get_by_name(link->manager, basename(network_file), &network);
3519 if (r < 0) {
3520 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3521 goto network_file_fail;
3522 }
3523
3524 r = network_apply(network, link);
3525 if (r < 0)
3526 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3527 }
3528
3529 network_file_fail:
3530
3531 if (addresses) {
3532 p = addresses;
3533
3534 for (;;) {
3535 _cleanup_free_ char *address_str = NULL;
3536 char *prefixlen_str;
3537 int family;
3538 unsigned char prefixlen;
3539
3540 r = extract_first_word(&p, &address_str, NULL, 0);
3541 if (r < 0) {
3542 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3543 continue;
3544 }
3545 if (r == 0)
3546 break;
3547
3548 prefixlen_str = strchr(address_str, '/');
3549 if (!prefixlen_str) {
3550 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3551 continue;
3552 }
3553
3554 *prefixlen_str++ = '\0';
3555
3556 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3557 if (r != 1) {
3558 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3559 continue;
3560 }
3561
3562 r = in_addr_from_string_auto(address_str, &family, &address);
3563 if (r < 0) {
3564 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3565 continue;
3566 }
3567
3568 r = address_add(link, family, &address, prefixlen, NULL);
3569 if (r < 0)
3570 return log_link_error_errno(link, r, "Failed to add address: %m");
3571 }
3572 }
3573
3574 if (routes) {
3575 p = routes;
3576
3577 for (;;) {
3578 Route *route;
3579 _cleanup_free_ char *route_str = NULL;
3580 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3581 usec_t lifetime;
3582 char *prefixlen_str;
3583 int family;
3584 unsigned char prefixlen, tos, table;
3585 uint32_t priority;
3586
3587 r = extract_first_word(&p, &route_str, NULL, 0);
3588 if (r < 0) {
3589 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3590 continue;
3591 }
3592 if (r == 0)
3593 break;
3594
3595 prefixlen_str = strchr(route_str, '/');
3596 if (!prefixlen_str) {
3597 log_link_debug(link, "Failed to parse route %s", route_str);
3598 continue;
3599 }
3600
3601 *prefixlen_str++ = '\0';
3602
3603 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3604 if (r != 5) {
3605 log_link_debug(link,
3606 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3607 prefixlen_str);
3608 continue;
3609 }
3610
3611 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3612 if (r < 0) {
3613 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3614 continue;
3615 }
3616
3617 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3618 if (r < 0)
3619 return log_link_error_errno(link, r, "Failed to add route: %m");
3620
3621 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3622 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3623 0, route_expire_handler, route);
3624 if (r < 0)
3625 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3626 }
3627
3628 route->lifetime = lifetime;
3629 sd_event_source_unref(route->expire);
3630 route->expire = TAKE_PTR(expire);
3631 }
3632 }
3633
3634 if (dhcp4_address) {
3635 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3636 if (r < 0) {
3637 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3638 goto dhcp4_address_fail;
3639 }
3640
3641 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3642 if (r < 0)
3643 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3644
3645 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3646 if (r < 0)
3647 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3648 }
3649
3650 dhcp4_address_fail:
3651
3652 if (ipv4ll_address) {
3653 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3654 if (r < 0) {
3655 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3656 goto ipv4ll_address_fail;
3657 }
3658
3659 r = sd_ipv4ll_new(&link->ipv4ll);
3660 if (r < 0)
3661 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3662
3663 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3664 if (r < 0)
3665 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3666 }
3667
3668 ipv4ll_address_fail:
3669
3670 return 0;
3671 }
3672
3673 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3674 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3675 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3676 Link *link;
3677 int r;
3678
3679 assert(m);
3680 assert(m->rtnl);
3681 assert(message);
3682 assert(ret);
3683
3684 r = link_new(m, message, ret);
3685 if (r < 0)
3686 return r;
3687
3688 link = *ret;
3689
3690 log_link_debug(link, "Link %d added", link->ifindex);
3691
3692 r = link_load(link);
3693 if (r < 0)
3694 return r;
3695
3696 if (detect_container() <= 0) {
3697 /* not in a container, udev will be around */
3698 sprintf(ifindex_str, "n%d", link->ifindex);
3699 r = sd_device_new_from_device_id(&device, ifindex_str);
3700 if (r < 0) {
3701 log_link_warning_errno(link, r, "Could not find device: %m");
3702 goto failed;
3703 }
3704
3705 r = sd_device_get_is_initialized(device);
3706 if (r < 0) {
3707 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3708 goto failed;
3709 }
3710 if (r == 0) {
3711 /* not yet ready */
3712 log_link_debug(link, "link pending udev initialization...");
3713 return 0;
3714 }
3715
3716 r = device_is_renaming(device);
3717 if (r < 0) {
3718 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3719 goto failed;
3720 }
3721 if (r > 0) {
3722 log_link_debug(link, "Interface is under renaming, pending initialization.");
3723 return 0;
3724 }
3725
3726 r = link_initialized(link, device);
3727 if (r < 0)
3728 goto failed;
3729 } else {
3730 r = link_initialized_and_synced(link);
3731 if (r < 0)
3732 goto failed;
3733 }
3734
3735 return 0;
3736 failed:
3737 link_enter_failed(link);
3738 return r;
3739 }
3740
3741 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3742 int r;
3743
3744 assert(link);
3745
3746 log_link_info(link, "Gained IPv6LL");
3747
3748 link->ipv6ll_address = *address;
3749 link_check_ready(link);
3750
3751 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3752 r = link_acquire_ipv6_conf(link);
3753 if (r < 0) {
3754 link_enter_failed(link);
3755 return r;
3756 }
3757 }
3758
3759 return 0;
3760 }
3761
3762 static int link_carrier_gained(Link *link) {
3763 int r;
3764
3765 assert(link);
3766
3767 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3768 r = link_acquire_conf(link);
3769 if (r < 0) {
3770 link_enter_failed(link);
3771 return r;
3772 }
3773
3774 r = link_request_set_addresses(link);
3775 if (r < 0)
3776 return r;
3777 }
3778
3779 r = link_handle_bound_by_list(link);
3780 if (r < 0)
3781 return r;
3782
3783 return 0;
3784 }
3785
3786 static int link_carrier_lost(Link *link) {
3787 int r;
3788
3789 assert(link);
3790
3791 if (link->network && link->network->ignore_carrier_loss)
3792 return 0;
3793
3794 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3795 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3796 * configuration and stop the clients as well. */
3797 if (link->setting_mtu)
3798 return 0;
3799
3800 r = link_stop_clients(link);
3801 if (r < 0) {
3802 link_enter_failed(link);
3803 return r;
3804 }
3805
3806 if (link_dhcp4_server_enabled(link))
3807 (void) sd_dhcp_server_stop(link->dhcp_server);
3808
3809 r = link_drop_config(link);
3810 if (r < 0)
3811 return r;
3812
3813 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3814 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3815 r = link_drop_foreign_config(link);
3816 if (r < 0)
3817 return r;
3818 }
3819
3820 r = link_handle_bound_by_list(link);
3821 if (r < 0)
3822 return r;
3823
3824 return 0;
3825 }
3826
3827 int link_carrier_reset(Link *link) {
3828 int r;
3829
3830 assert(link);
3831
3832 if (link_has_carrier(link)) {
3833 r = link_carrier_lost(link);
3834 if (r < 0)
3835 return r;
3836
3837 r = link_carrier_gained(link);
3838 if (r < 0)
3839 return r;
3840
3841 log_link_info(link, "Reset carrier");
3842 }
3843
3844 return 0;
3845 }
3846
3847 int link_update(Link *link, sd_netlink_message *m) {
3848 struct ether_addr mac;
3849 const char *ifname;
3850 uint32_t mtu;
3851 bool had_carrier, carrier_gained, carrier_lost;
3852 int r;
3853
3854 assert(link);
3855 assert(link->ifname);
3856 assert(m);
3857
3858 if (link->state == LINK_STATE_LINGER) {
3859 log_link_info(link, "Link re-added");
3860 link_set_state(link, LINK_STATE_CONFIGURING);
3861
3862 r = link_new_carrier_maps(link);
3863 if (r < 0)
3864 return r;
3865 }
3866
3867 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3868 if (r >= 0 && !streq(ifname, link->ifname)) {
3869 Manager *manager = link->manager;
3870
3871 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3872
3873 link_drop(link);
3874 r = link_add(manager, m, &link);
3875 if (r < 0)
3876 return r;
3877 }
3878
3879 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3880 if (r >= 0 && mtu > 0) {
3881 link->mtu = mtu;
3882 if (link->original_mtu == 0) {
3883 link->original_mtu = mtu;
3884 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3885 }
3886
3887 if (link->dhcp_client) {
3888 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3889 link->mtu);
3890 if (r < 0)
3891 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3892 }
3893
3894 if (link->radv) {
3895 r = sd_radv_set_mtu(link->radv, link->mtu);
3896 if (r < 0)
3897 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3898 }
3899 }
3900
3901 /* The kernel may broadcast NEWLINK messages without the MAC address
3902 set, simply ignore them. */
3903 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3904 if (r >= 0) {
3905 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3906 ETH_ALEN)) {
3907
3908 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3909 ETH_ALEN);
3910
3911 log_link_debug(link, "MAC address: "
3912 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3913 mac.ether_addr_octet[0],
3914 mac.ether_addr_octet[1],
3915 mac.ether_addr_octet[2],
3916 mac.ether_addr_octet[3],
3917 mac.ether_addr_octet[4],
3918 mac.ether_addr_octet[5]);
3919
3920 if (link->ipv4ll) {
3921 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3922 if (r < 0)
3923 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3924 }
3925
3926 if (link->dhcp_client) {
3927 r = sd_dhcp_client_set_mac(link->dhcp_client,
3928 (const uint8_t *) &link->mac,
3929 sizeof (link->mac),
3930 ARPHRD_ETHER);
3931 if (r < 0)
3932 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3933
3934 r = dhcp4_set_client_identifier(link);
3935 if (r < 0)
3936 return r;
3937 }
3938
3939 if (link->dhcp6_client) {
3940 const DUID* duid = link_get_duid(link);
3941
3942 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3943 (const uint8_t *) &link->mac,
3944 sizeof (link->mac),
3945 ARPHRD_ETHER);
3946 if (r < 0)
3947 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3948
3949 if (link->network->iaid_set) {
3950 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3951 link->network->iaid);
3952 if (r < 0)
3953 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3954 }
3955
3956 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3957 duid->type,
3958 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3959 duid->raw_data_len);
3960 if (r < 0)
3961 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3962 }
3963
3964 if (link->radv) {
3965 r = sd_radv_set_mac(link->radv, &link->mac);
3966 if (r < 0)
3967 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3968 }
3969
3970 if (link->ndisc) {
3971 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3972 if (r < 0)
3973 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3974 }
3975 }
3976 }
3977
3978 had_carrier = link_has_carrier(link);
3979
3980 r = link_update_flags(link, m);
3981 if (r < 0)
3982 return r;
3983
3984 r = link_update_lldp(link);
3985 if (r < 0)
3986 return r;
3987
3988 carrier_gained = !had_carrier && link_has_carrier(link);
3989 carrier_lost = had_carrier && !link_has_carrier(link);
3990
3991 if (carrier_gained) {
3992 log_link_info(link, "Gained carrier");
3993
3994 r = link_carrier_gained(link);
3995 if (r < 0)
3996 return r;
3997 } else if (carrier_lost) {
3998 log_link_info(link, "Lost carrier");
3999
4000 r = link_carrier_lost(link);
4001 if (r < 0)
4002 return r;
4003 }
4004
4005 return 0;
4006 }
4007
4008 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
4009 bool space = false;
4010 Iterator i;
4011 Link *link;
4012
4013 assert(f);
4014 assert(prefix);
4015
4016 if (hashmap_isempty(h))
4017 return;
4018
4019 fputs(prefix, f);
4020 HASHMAP_FOREACH(link, h, i) {
4021 if (space)
4022 fputc(' ', f);
4023
4024 fprintf(f, "%i", link->ifindex);
4025 space = true;
4026 }
4027
4028 fputc('\n', f);
4029 }
4030
4031 int link_save(Link *link) {
4032 _cleanup_free_ char *temp_path = NULL;
4033 _cleanup_fclose_ FILE *f = NULL;
4034 const char *admin_state, *oper_state;
4035 Address *a;
4036 Route *route;
4037 Iterator i;
4038 int r;
4039
4040 assert(link);
4041 assert(link->state_file);
4042 assert(link->lease_file);
4043 assert(link->manager);
4044
4045 if (link->state == LINK_STATE_LINGER) {
4046 (void) unlink(link->state_file);
4047 return 0;
4048 }
4049
4050 link_lldp_save(link);
4051
4052 admin_state = link_state_to_string(link->state);
4053 assert(admin_state);
4054
4055 oper_state = link_operstate_to_string(link->operstate);
4056 assert(oper_state);
4057
4058 r = fopen_temporary(link->state_file, &f, &temp_path);
4059 if (r < 0)
4060 goto fail;
4061
4062 (void) fchmod(fileno(f), 0644);
4063
4064 fprintf(f,
4065 "# This is private data. Do not parse.\n"
4066 "ADMIN_STATE=%s\n"
4067 "OPER_STATE=%s\n",
4068 admin_state, oper_state);
4069
4070 if (link->network) {
4071 bool space;
4072 sd_dhcp6_lease *dhcp6_lease = NULL;
4073 const char *dhcp_domainname = NULL;
4074 char **dhcp6_domains = NULL;
4075 char **dhcp_domains = NULL;
4076 unsigned j;
4077
4078 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4079 yes_no(link->network->required_for_online));
4080
4081 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
4082 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
4083
4084 if (link->dhcp6_client) {
4085 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
4086 if (r < 0 && r != -ENOMSG)
4087 log_link_debug(link, "No DHCPv6 lease");
4088 }
4089
4090 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4091
4092 fputs("DNS=", f);
4093 space = false;
4094
4095 for (j = 0; j < link->network->n_dns; j++) {
4096 _cleanup_free_ char *b = NULL;
4097
4098 r = in_addr_to_string(link->network->dns[j].family,
4099 &link->network->dns[j].address, &b);
4100 if (r < 0) {
4101 log_debug_errno(r, "Failed to format address, ignoring: %m");
4102 continue;
4103 }
4104
4105 if (space)
4106 fputc(' ', f);
4107 fputs(b, f);
4108 space = true;
4109 }
4110
4111 if (link->network->dhcp_use_dns &&
4112 link->dhcp_lease) {
4113 const struct in_addr *addresses;
4114
4115 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
4116 if (r > 0)
4117 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4118 space = true;
4119 }
4120
4121 if (link->network->dhcp_use_dns && dhcp6_lease) {
4122 struct in6_addr *in6_addrs;
4123
4124 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
4125 if (r > 0) {
4126 if (space)
4127 fputc(' ', f);
4128 serialize_in6_addrs(f, in6_addrs, r);
4129 space = true;
4130 }
4131 }
4132
4133 /* Make sure to flush out old entries before we use the NDISC data */
4134 ndisc_vacuum(link);
4135
4136 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4137 NDiscRDNSS *dd;
4138
4139 SET_FOREACH(dd, link->ndisc_rdnss, i) {
4140 if (space)
4141 fputc(' ', f);
4142
4143 serialize_in6_addrs(f, &dd->address, 1);
4144 space = true;
4145 }
4146 }
4147
4148 fputc('\n', f);
4149
4150 fputs("NTP=", f);
4151 space = false;
4152 fputstrv(f, link->network->ntp, NULL, &space);
4153
4154 if (link->network->dhcp_use_ntp &&
4155 link->dhcp_lease) {
4156 const struct in_addr *addresses;
4157
4158 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
4159 if (r > 0)
4160 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4161 space = true;
4162 }
4163
4164 if (link->network->dhcp_use_ntp && dhcp6_lease) {
4165 struct in6_addr *in6_addrs;
4166 char **hosts;
4167
4168 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
4169 &in6_addrs);
4170 if (r > 0) {
4171 if (space)
4172 fputc(' ', f);
4173 serialize_in6_addrs(f, in6_addrs, r);
4174 space = true;
4175 }
4176
4177 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
4178 if (r > 0)
4179 fputstrv(f, hosts, NULL, &space);
4180 }
4181
4182 fputc('\n', f);
4183
4184 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4185 if (link->dhcp_lease) {
4186 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4187 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4188 }
4189 if (dhcp6_lease)
4190 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4191 }
4192
4193 ordered_set_print(f, "DOMAINS=", link->network->search_domains);
4194
4195 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4196 NDiscDNSSL *dd;
4197
4198 if (dhcp_domainname)
4199 fputs_with_space(f, dhcp_domainname, NULL, &space);
4200 if (dhcp_domains)
4201 fputstrv(f, dhcp_domains, NULL, &space);
4202 if (dhcp6_domains)
4203 fputstrv(f, dhcp6_domains, NULL, &space);
4204
4205 SET_FOREACH(dd, link->ndisc_dnssl, i)
4206 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4207 }
4208
4209 fputc('\n', f);
4210
4211 ordered_set_print(f, "ROUTE_DOMAINS=", link->network->route_domains);
4212
4213 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4214 NDiscDNSSL *dd;
4215
4216 if (dhcp_domainname)
4217 fputs_with_space(f, dhcp_domainname, NULL, &space);
4218 if (dhcp_domains)
4219 fputstrv(f, dhcp_domains, NULL, &space);
4220 if (dhcp6_domains)
4221 fputstrv(f, dhcp6_domains, NULL, &space);
4222
4223 SET_FOREACH(dd, link->ndisc_dnssl, i)
4224 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4225 }
4226
4227 fputc('\n', f);
4228
4229 fprintf(f, "LLMNR=%s\n",
4230 resolve_support_to_string(link->network->llmnr));
4231 fprintf(f, "MDNS=%s\n",
4232 resolve_support_to_string(link->network->mdns));
4233 if (link->network->dns_default_route >= 0)
4234 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
4235
4236 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4237 fprintf(f, "DNS_OVER_TLS=%s\n",
4238 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
4239
4240 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
4241 fprintf(f, "DNSSEC=%s\n",
4242 dnssec_mode_to_string(link->network->dnssec_mode));
4243
4244 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
4245 const char *n;
4246
4247 fputs("DNSSEC_NTA=", f);
4248 space = false;
4249 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
4250 fputs_with_space(f, n, NULL, &space);
4251 fputc('\n', f);
4252 }
4253
4254 fputs("ADDRESSES=", f);
4255 space = false;
4256 SET_FOREACH(a, link->addresses, i) {
4257 _cleanup_free_ char *address_str = NULL;
4258
4259 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4260 if (r < 0)
4261 goto fail;
4262
4263 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4264 space = true;
4265 }
4266 fputc('\n', f);
4267
4268 fputs("ROUTES=", f);
4269 space = false;
4270 SET_FOREACH(route, link->routes, i) {
4271 _cleanup_free_ char *route_str = NULL;
4272
4273 r = in_addr_to_string(route->family, &route->dst, &route_str);
4274 if (r < 0)
4275 goto fail;
4276
4277 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4278 space ? " " : "", route_str,
4279 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4280 space = true;
4281 }
4282
4283 fputc('\n', f);
4284 }
4285
4286 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4287 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4288
4289 if (link->dhcp_lease) {
4290 struct in_addr address;
4291 const char *tz = NULL;
4292
4293 assert(link->network);
4294
4295 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
4296 if (r >= 0)
4297 fprintf(f, "TIMEZONE=%s\n", tz);
4298
4299 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
4300 if (r >= 0) {
4301 fputs("DHCP4_ADDRESS=", f);
4302 serialize_in_addrs(f, &address, 1, false, NULL);
4303 fputc('\n', f);
4304 }
4305
4306 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4307 if (r < 0)
4308 goto fail;
4309
4310 fprintf(f,
4311 "DHCP_LEASE=%s\n",
4312 link->lease_file);
4313 } else
4314 (void) unlink(link->lease_file);
4315
4316 if (link->ipv4ll) {
4317 struct in_addr address;
4318
4319 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4320 if (r >= 0) {
4321 fputs("IPV4LL_ADDRESS=", f);
4322 serialize_in_addrs(f, &address, 1, false, NULL);
4323 fputc('\n', f);
4324 }
4325 }
4326
4327 r = fflush_and_check(f);
4328 if (r < 0)
4329 goto fail;
4330
4331 if (rename(temp_path, link->state_file) < 0) {
4332 r = -errno;
4333 goto fail;
4334 }
4335
4336 return 0;
4337
4338 fail:
4339 (void) unlink(link->state_file);
4340 if (temp_path)
4341 (void) unlink(temp_path);
4342
4343 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4344 }
4345
4346 /* The serialized state in /run is no longer up-to-date. */
4347 void link_dirty(Link *link) {
4348 int r;
4349
4350 assert(link);
4351
4352 /* mark manager dirty as link is dirty */
4353 manager_dirty(link->manager);
4354
4355 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
4356 if (r < 0)
4357 /* allocation errors are ignored */
4358 return;
4359
4360 r = set_put(link->manager->dirty_links, link);
4361 if (r <= 0)
4362 /* don't take another ref if the link was already dirty */
4363 return;
4364
4365 link_ref(link);
4366 }
4367
4368 /* The serialized state in /run is up-to-date */
4369 void link_clean(Link *link) {
4370 assert(link);
4371 assert(link->manager);
4372
4373 link_unref(set_remove(link->manager->dirty_links, link));
4374 }
4375
4376 static const char* const link_state_table[_LINK_STATE_MAX] = {
4377 [LINK_STATE_PENDING] = "pending",
4378 [LINK_STATE_INITIALIZED] = "initialized",
4379 [LINK_STATE_CONFIGURING] = "configuring",
4380 [LINK_STATE_CONFIGURED] = "configured",
4381 [LINK_STATE_UNMANAGED] = "unmanaged",
4382 [LINK_STATE_FAILED] = "failed",
4383 [LINK_STATE_LINGER] = "linger",
4384 };
4385
4386 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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