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network: fix use-after-free
[thirdparty/systemd.git] / src / network / networkd-link.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <netinet/ether.h>
4 #include <linux/if.h>
5 #include <linux/can/netlink.h>
6 #include <unistd.h>
7
8 #include "alloc-util.h"
9 #include "bus-util.h"
10 #include "dhcp-identifier.h"
11 #include "dhcp-lease-internal.h"
12 #include "env-file.h"
13 #include "fd-util.h"
14 #include "fileio.h"
15 #include "missing_network.h"
16 #include "netdev/vrf.h"
17 #include "netlink-util.h"
18 #include "network-internal.h"
19 #include "networkd-ipv6-proxy-ndp.h"
20 #include "networkd-lldp-tx.h"
21 #include "networkd-manager.h"
22 #include "networkd-ndisc.h"
23 #include "networkd-neighbor.h"
24 #include "networkd-radv.h"
25 #include "networkd-routing-policy-rule.h"
26 #include "set.h"
27 #include "socket-util.h"
28 #include "stdio-util.h"
29 #include "string-table.h"
30 #include "strv.h"
31 #include "sysctl-util.h"
32 #include "tmpfile-util.h"
33 #include "udev-util.h"
34 #include "util.h"
35 #include "virt.h"
36
37 uint32_t link_get_vrf_table(Link *link) {
38 return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
39 }
40
41 uint32_t link_get_dhcp_route_table(Link *link) {
42 /* When the interface is part of an VRF use the VRFs routing table, unless
43 * another table is explicitly specified. */
44 if (link->network->dhcp_route_table_set)
45 return link->network->dhcp_route_table;
46 return link_get_vrf_table(link);
47 }
48
49 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
50 if (link->network->ipv6_accept_ra_route_table_set)
51 return link->network->ipv6_accept_ra_route_table;
52 return link_get_vrf_table(link);
53 }
54
55 DUID* link_get_duid(Link *link) {
56 if (link->network->duid.type != _DUID_TYPE_INVALID)
57 return &link->network->duid;
58 else
59 return &link->manager->duid;
60 }
61
62 static bool link_dhcp6_enabled(Link *link) {
63 assert(link);
64
65 if (!socket_ipv6_is_supported())
66 return false;
67
68 if (link->flags & IFF_LOOPBACK)
69 return false;
70
71 if (!link->network)
72 return false;
73
74 if (link->network->bond)
75 return false;
76
77 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
78 return false;
79
80 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
81 }
82
83 static bool link_dhcp4_enabled(Link *link) {
84 assert(link);
85
86 if (link->flags & IFF_LOOPBACK)
87 return false;
88
89 if (!link->network)
90 return false;
91
92 if (link->network->bond)
93 return false;
94
95 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
96 }
97
98 static bool link_dhcp4_server_enabled(Link *link) {
99 assert(link);
100
101 if (link->flags & IFF_LOOPBACK)
102 return false;
103
104 if (!link->network)
105 return false;
106
107 if (link->network->bond)
108 return false;
109
110 return link->network->dhcp_server;
111 }
112
113 bool link_ipv4ll_enabled(Link *link) {
114 assert(link);
115
116 if (link->flags & IFF_LOOPBACK)
117 return false;
118
119 if (!link->network)
120 return false;
121
122 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard"))
123 return false;
124
125 if (link->network->bond)
126 return false;
127
128 return link->network->link_local & ADDRESS_FAMILY_IPV4;
129 }
130
131 bool link_ipv4ll_fallback_enabled(Link *link) {
132 assert(link);
133
134 if (link->flags & IFF_LOOPBACK)
135 return false;
136
137 if (!link->network)
138 return false;
139
140 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard"))
141 return false;
142
143 if (link->network->bond)
144 return false;
145
146 return link->network->link_local & ADDRESS_FAMILY_FALLBACK_IPV4;
147 }
148
149 static bool link_ipv6ll_enabled(Link *link) {
150 assert(link);
151
152 if (!socket_ipv6_is_supported())
153 return false;
154
155 if (link->flags & IFF_LOOPBACK)
156 return false;
157
158 if (!link->network)
159 return false;
160
161 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard"))
162 return false;
163
164 if (link->network->bond)
165 return false;
166
167 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
168 return false;
169
170 return link->network->link_local & ADDRESS_FAMILY_IPV6;
171 }
172
173 static bool link_ipv6_enabled(Link *link) {
174 assert(link);
175
176 if (!socket_ipv6_is_supported())
177 return false;
178
179 if (link->network->bond)
180 return false;
181
182 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
183 return false;
184
185 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
186 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
187 }
188
189 static bool link_radv_enabled(Link *link) {
190 assert(link);
191
192 if (!link_ipv6ll_enabled(link))
193 return false;
194
195 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
196 }
197
198 static bool link_lldp_rx_enabled(Link *link) {
199 assert(link);
200
201 if (link->flags & IFF_LOOPBACK)
202 return false;
203
204 if (link->iftype != ARPHRD_ETHER)
205 return false;
206
207 if (!link->network)
208 return false;
209
210 /* LLDP should be handled on bridge slaves as those have a direct
211 * connection to their peers not on the bridge master. Linux doesn't
212 * even (by default) forward lldp packets to the bridge master.*/
213 if (streq_ptr("bridge", link->kind))
214 return false;
215
216 return link->network->lldp_mode != LLDP_MODE_NO;
217 }
218
219 static bool link_lldp_emit_enabled(Link *link) {
220 assert(link);
221
222 if (link->flags & IFF_LOOPBACK)
223 return false;
224
225 if (link->iftype != ARPHRD_ETHER)
226 return false;
227
228 if (!link->network)
229 return false;
230
231 return link->network->lldp_emit != LLDP_EMIT_NO;
232 }
233
234 static bool link_ipv4_forward_enabled(Link *link) {
235 assert(link);
236
237 if (link->flags & IFF_LOOPBACK)
238 return false;
239
240 if (!link->network)
241 return false;
242
243 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
244 return false;
245
246 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
247 }
248
249 static bool link_ipv6_forward_enabled(Link *link) {
250 assert(link);
251
252 if (!socket_ipv6_is_supported())
253 return false;
254
255 if (link->flags & IFF_LOOPBACK)
256 return false;
257
258 if (!link->network)
259 return false;
260
261 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
262 return false;
263
264 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
265 return false;
266
267 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
268 }
269
270 static bool link_proxy_arp_enabled(Link *link) {
271 assert(link);
272
273 if (link->flags & IFF_LOOPBACK)
274 return false;
275
276 if (!link->network)
277 return false;
278
279 if (link->network->proxy_arp < 0)
280 return false;
281
282 return true;
283 }
284
285 static bool link_ipv6_accept_ra_enabled(Link *link) {
286 assert(link);
287
288 if (!socket_ipv6_is_supported())
289 return false;
290
291 if (link->flags & IFF_LOOPBACK)
292 return false;
293
294 if (!link->network)
295 return false;
296
297 if (!link_ipv6ll_enabled(link))
298 return false;
299
300 /* If unset use system default (enabled if local forwarding is disabled.
301 * disabled if local forwarding is enabled).
302 * If set, ignore or enforce RA independent of local forwarding state.
303 */
304 if (link->network->ipv6_accept_ra < 0)
305 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
306 return !link_ipv6_forward_enabled(link);
307 else if (link->network->ipv6_accept_ra > 0)
308 /* accept RA even if ip_forward is enabled */
309 return true;
310 else
311 /* ignore RA */
312 return false;
313 }
314
315 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
316 assert(link);
317
318 if (!socket_ipv6_is_supported())
319 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
320
321 if (link->flags & IFF_LOOPBACK)
322 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
323
324 if (!link->network)
325 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
326
327 return link->network->ipv6_privacy_extensions;
328 }
329
330 static int link_enable_ipv6(Link *link) {
331 bool disabled;
332 int r;
333
334 if (link->flags & IFF_LOOPBACK)
335 return 0;
336
337 disabled = !link_ipv6_enabled(link);
338
339 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", disabled);
340 if (r < 0)
341 log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m",
342 enable_disable(!disabled), link->ifname);
343 else
344 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
345
346 return 0;
347 }
348
349 static bool link_is_enslaved(Link *link) {
350 if (link->flags & IFF_SLAVE)
351 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
352 return true;
353
354 if (!link->enslaved_raw)
355 return false;
356
357 if (!link->network)
358 return false;
359
360 if (link->network->bridge)
361 /* TODO: support the case when link is not managed by networkd. */
362 return true;
363
364 return false;
365 }
366
367 static void link_update_master_operstate(Link *link, NetDev *netdev) {
368 Link *master;
369
370 if (!netdev)
371 return;
372
373 if (link_get(link->manager, netdev->ifindex, &master) < 0)
374 return;
375
376 link_update_operstate(master, true);
377 }
378
379 void link_update_operstate(Link *link, bool also_update_master) {
380 LinkOperationalState operstate;
381 Iterator i;
382
383 assert(link);
384
385 if (link->kernel_operstate == IF_OPER_DORMANT)
386 operstate = LINK_OPERSTATE_DORMANT;
387 else if (link_has_carrier(link)) {
388 Address *address;
389 uint8_t scope = RT_SCOPE_NOWHERE;
390
391 /* if we have carrier, check what addresses we have */
392 SET_FOREACH(address, link->addresses, i) {
393 if (!address_is_ready(address))
394 continue;
395
396 if (address->scope < scope)
397 scope = address->scope;
398 }
399
400 /* for operstate we also take foreign addresses into account */
401 SET_FOREACH(address, link->addresses_foreign, i) {
402 if (!address_is_ready(address))
403 continue;
404
405 if (address->scope < scope)
406 scope = address->scope;
407 }
408
409 if (scope < RT_SCOPE_SITE)
410 /* universally accessible addresses found */
411 operstate = LINK_OPERSTATE_ROUTABLE;
412 else if (scope < RT_SCOPE_HOST)
413 /* only link or site local addresses found */
414 operstate = LINK_OPERSTATE_DEGRADED;
415 else
416 /* no useful addresses found */
417 operstate = LINK_OPERSTATE_CARRIER;
418 } else if (link->flags & IFF_UP)
419 operstate = LINK_OPERSTATE_NO_CARRIER;
420 else
421 operstate = LINK_OPERSTATE_OFF;
422
423 if (IN_SET(operstate, LINK_OPERSTATE_DEGRADED, LINK_OPERSTATE_CARRIER) &&
424 link_is_enslaved(link))
425 operstate = LINK_OPERSTATE_ENSLAVED;
426
427 if (operstate >= LINK_OPERSTATE_CARRIER) {
428 Link *slave;
429
430 SET_FOREACH(slave, link->slaves, i) {
431 link_update_operstate(slave, false);
432
433 if (slave->operstate < LINK_OPERSTATE_CARRIER)
434 operstate = LINK_OPERSTATE_DEGRADED_CARRIER;
435 }
436 }
437
438 if (link->operstate != operstate) {
439 link->operstate = operstate;
440 link_send_changed(link, "OperationalState", NULL);
441 link_dirty(link);
442 }
443
444 if (also_update_master && link->network) {
445 link_update_master_operstate(link, link->network->bond);
446 link_update_master_operstate(link, link->network->bridge);
447 }
448 }
449
450 #define FLAG_STRING(string, flag, old, new) \
451 (((old ^ new) & flag) \
452 ? ((old & flag) ? (" -" string) : (" +" string)) \
453 : "")
454
455 static int link_update_flags(Link *link, sd_netlink_message *m) {
456 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
457 uint8_t operstate;
458 int r;
459
460 assert(link);
461
462 r = sd_rtnl_message_link_get_flags(m, &flags);
463 if (r < 0)
464 return log_link_warning_errno(link, r, "Could not get link flags: %m");
465
466 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
467 if (r < 0)
468 /* if we got a message without operstate, take it to mean
469 the state was unchanged */
470 operstate = link->kernel_operstate;
471
472 if ((link->flags == flags) && (link->kernel_operstate == operstate))
473 return 0;
474
475 if (link->flags != flags) {
476 log_link_debug(link, "Flags change:%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
477 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
478 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
479 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
480 FLAG_STRING("UP", IFF_UP, link->flags, flags),
481 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
482 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
483 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
484 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
485 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
486 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
487 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
488 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
489 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
490 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
491 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
492 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
493 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
494 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
495 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
496
497 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
498 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
499 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
500 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
501 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
502 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
503 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
504 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
505
506 /* link flags are currently at most 18 bits, let's align to
507 * printing 20 */
508 if (unknown_flags_added)
509 log_link_debug(link,
510 "Unknown link flags gained: %#.5x (ignoring)",
511 unknown_flags_added);
512
513 if (unknown_flags_removed)
514 log_link_debug(link,
515 "Unknown link flags lost: %#.5x (ignoring)",
516 unknown_flags_removed);
517 }
518
519 link->flags = flags;
520 link->kernel_operstate = operstate;
521
522 link_update_operstate(link, true);
523
524 return 0;
525 }
526
527 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
528 _cleanup_(link_unrefp) Link *link = NULL;
529 uint16_t type;
530 const char *ifname, *kind = NULL;
531 int r, ifindex;
532 unsigned short iftype;
533
534 assert(manager);
535 assert(message);
536 assert(ret);
537
538 /* check for link kind */
539 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
540 if (r == 0) {
541 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
542 r = sd_netlink_message_exit_container(message);
543 if (r < 0)
544 return r;
545 }
546
547 r = sd_netlink_message_get_type(message, &type);
548 if (r < 0)
549 return r;
550 else if (type != RTM_NEWLINK)
551 return -EINVAL;
552
553 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
554 if (r < 0)
555 return r;
556 else if (ifindex <= 0)
557 return -EINVAL;
558
559 r = sd_rtnl_message_link_get_type(message, &iftype);
560 if (r < 0)
561 return r;
562
563 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
564 if (r < 0)
565 return r;
566
567 link = new(Link, 1);
568 if (!link)
569 return -ENOMEM;
570
571 *link = (Link) {
572 .n_ref = 1,
573 .manager = manager,
574 .state = LINK_STATE_PENDING,
575 .rtnl_extended_attrs = true,
576 .ifindex = ifindex,
577 .iftype = iftype,
578 };
579
580 link->ifname = strdup(ifname);
581 if (!link->ifname)
582 return -ENOMEM;
583
584 if (kind) {
585 link->kind = strdup(kind);
586 if (!link->kind)
587 return -ENOMEM;
588 }
589
590 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
591 if (r < 0)
592 log_link_debug_errno(link, r, "New device has no master, continuing without");
593
594 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
595 if (r < 0)
596 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
597
598 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
599 return -ENOMEM;
600
601 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
602 return -ENOMEM;
603
604 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
605 return -ENOMEM;
606
607 r = hashmap_ensure_allocated(&manager->links, NULL);
608 if (r < 0)
609 return r;
610
611 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
612 if (r < 0)
613 return r;
614
615 r = link_update_flags(link, message);
616 if (r < 0)
617 return r;
618
619 *ret = TAKE_PTR(link);
620
621 return 0;
622 }
623
624 static Link *link_free(Link *link) {
625 Address *address;
626
627 assert(link);
628
629 link->routes = set_free_with_destructor(link->routes, route_free);
630 link->routes_foreign = set_free_with_destructor(link->routes_foreign, route_free);
631
632 link->addresses = set_free_with_destructor(link->addresses, address_free);
633 link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free);
634
635 while ((address = link->pool_addresses)) {
636 LIST_REMOVE(addresses, link->pool_addresses, address);
637 address_free(address);
638 }
639
640 sd_dhcp_server_unref(link->dhcp_server);
641 sd_dhcp_client_unref(link->dhcp_client);
642 sd_dhcp_lease_unref(link->dhcp_lease);
643
644 link_lldp_emit_stop(link);
645
646 free(link->lease_file);
647
648 sd_lldp_unref(link->lldp);
649 free(link->lldp_file);
650
651 ndisc_flush(link);
652
653 sd_ipv4ll_unref(link->ipv4ll);
654 sd_dhcp6_client_unref(link->dhcp6_client);
655 sd_ndisc_unref(link->ndisc);
656 sd_radv_unref(link->radv);
657
658 free(link->ifname);
659 free(link->kind);
660
661 (void) unlink(link->state_file);
662 free(link->state_file);
663
664 sd_device_unref(link->sd_device);
665
666 hashmap_free(link->bound_to_links);
667 hashmap_free(link->bound_by_links);
668
669 set_free_with_destructor(link->slaves, link_unref);
670
671 network_unref(link->network);
672
673 return mfree(link);
674 }
675
676 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
677
678 int link_get(Manager *m, int ifindex, Link **ret) {
679 Link *link;
680
681 assert(m);
682 assert(ifindex);
683 assert(ret);
684
685 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
686 if (!link)
687 return -ENODEV;
688
689 *ret = link;
690
691 return 0;
692 }
693
694 static void link_set_state(Link *link, LinkState state) {
695 assert(link);
696
697 if (link->state == state)
698 return;
699
700 log_link_debug(link, "State changed: %s -> %s",
701 link_state_to_string(link->state),
702 link_state_to_string(state));
703
704 link->state = state;
705
706 link_send_changed(link, "AdministrativeState", NULL);
707 }
708
709 static void link_enter_unmanaged(Link *link) {
710 assert(link);
711
712 log_link_debug(link, "Unmanaged");
713
714 link_set_state(link, LINK_STATE_UNMANAGED);
715
716 link_dirty(link);
717 }
718
719 int link_stop_clients(Link *link) {
720 int r = 0, k;
721
722 assert(link);
723 assert(link->manager);
724 assert(link->manager->event);
725
726 if (link->dhcp_client) {
727 k = sd_dhcp_client_stop(link->dhcp_client);
728 if (k < 0)
729 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
730 }
731
732 if (link->ipv4ll) {
733 k = sd_ipv4ll_stop(link->ipv4ll);
734 if (k < 0)
735 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
736 }
737
738 if (link->dhcp6_client) {
739 k = sd_dhcp6_client_stop(link->dhcp6_client);
740 if (k < 0)
741 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
742 }
743
744 if (link->ndisc) {
745 k = sd_ndisc_stop(link->ndisc);
746 if (k < 0)
747 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
748 }
749
750 if (link->radv) {
751 k = sd_radv_stop(link->radv);
752 if (k < 0)
753 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
754 }
755
756 link_lldp_emit_stop(link);
757 return r;
758 }
759
760 void link_enter_failed(Link *link) {
761 assert(link);
762
763 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
764 return;
765
766 log_link_warning(link, "Failed");
767
768 link_set_state(link, LINK_STATE_FAILED);
769
770 link_stop_clients(link);
771
772 link_dirty(link);
773 }
774
775 static Address* link_find_dhcp_server_address(Link *link) {
776 Address *address;
777
778 assert(link);
779 assert(link->network);
780
781 /* The first statically configured address if there is any */
782 LIST_FOREACH(addresses, address, link->network->static_addresses) {
783
784 if (address->family != AF_INET)
785 continue;
786
787 if (in_addr_is_null(address->family, &address->in_addr))
788 continue;
789
790 return address;
791 }
792
793 /* If that didn't work, find a suitable address we got from the pool */
794 LIST_FOREACH(addresses, address, link->pool_addresses) {
795 if (address->family != AF_INET)
796 continue;
797
798 return address;
799 }
800
801 return NULL;
802 }
803
804 static int link_join_netdevs_after_configured(Link *link) {
805 NetDev *netdev;
806 Iterator i;
807 int r;
808
809 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
810 if (netdev->ifindex > 0)
811 /* Assume already enslaved. */
812 continue;
813
814 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
815 continue;
816
817 log_struct(LOG_DEBUG,
818 LOG_LINK_INTERFACE(link),
819 LOG_NETDEV_INTERFACE(netdev),
820 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
821
822 r = netdev_join(netdev, link, NULL);
823 if (r < 0)
824 return log_struct_errno(LOG_WARNING, r,
825 LOG_LINK_INTERFACE(link),
826 LOG_NETDEV_INTERFACE(netdev),
827 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
828 }
829
830 return 0;
831 }
832
833 static void link_enter_configured(Link *link) {
834 assert(link);
835 assert(link->network);
836
837 if (link->state != LINK_STATE_CONFIGURING)
838 return;
839
840 log_link_info(link, "Configured");
841
842 link_set_state(link, LINK_STATE_CONFIGURED);
843
844 (void) link_join_netdevs_after_configured(link);
845
846 link_dirty(link);
847 }
848
849 static int link_request_set_routing_policy_rule(Link *link) {
850 RoutingPolicyRule *rule, *rrule = NULL;
851 int r;
852
853 assert(link);
854 assert(link->network);
855
856 link_set_state(link, LINK_STATE_CONFIGURING);
857 link->routing_policy_rules_configured = false;
858
859 LIST_FOREACH(rules, rule, link->network->rules) {
860 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
861 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif,
862 rule->protocol, &rule->sport, &rule->dport, &rrule);
863 if (r == 0) {
864 (void) routing_policy_rule_make_local(link->manager, rrule);
865 continue;
866 }
867
868 r = routing_policy_rule_configure(rule, link, NULL, false);
869 if (r < 0) {
870 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
871 link_enter_failed(link);
872 return r;
873 }
874
875 link->routing_policy_rule_messages++;
876 }
877
878 routing_policy_rule_purge(link->manager, link);
879 if (link->routing_policy_rule_messages == 0) {
880 link->routing_policy_rules_configured = true;
881 link_check_ready(link);
882 } else
883 log_link_debug(link, "Setting routing policy rules");
884
885 return 0;
886 }
887
888 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
889 int r;
890
891 assert(link);
892 assert(link->route_messages > 0);
893 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
894 LINK_STATE_FAILED, LINK_STATE_LINGER));
895
896 link->route_messages--;
897
898 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
899 return 1;
900
901 r = sd_netlink_message_get_errno(m);
902 if (r < 0 && r != -EEXIST)
903 log_link_warning_errno(link, r, "Could not set route: %m");
904
905 if (link->route_messages == 0) {
906 log_link_debug(link, "Routes set");
907 link->static_routes_configured = true;
908 link_check_ready(link);
909 }
910
911 return 1;
912 }
913
914 int link_request_set_routes(Link *link) {
915 enum {
916 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
917 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
918 _PHASE_MAX
919 } phase;
920 Route *rt;
921 int r;
922
923 assert(link);
924 assert(link->network);
925 assert(link->addresses_configured);
926 assert(link->address_messages == 0);
927 assert(link->state != _LINK_STATE_INVALID);
928
929 link_set_state(link, LINK_STATE_CONFIGURING);
930 link->static_routes_configured = false;
931
932 r = link_request_set_routing_policy_rule(link);
933 if (r < 0)
934 return r;
935
936 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
937 for (phase = 0; phase < _PHASE_MAX; phase++)
938 LIST_FOREACH(routes, rt, link->network->static_routes) {
939
940 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
941 continue;
942
943 r = route_configure(rt, link, route_handler);
944 if (r < 0) {
945 log_link_warning_errno(link, r, "Could not set routes: %m");
946 link_enter_failed(link);
947 return r;
948 }
949
950 link->route_messages++;
951 }
952
953 if (link->route_messages == 0) {
954 link->static_routes_configured = true;
955 link_check_ready(link);
956 } else
957 log_link_debug(link, "Setting routes");
958
959 return 0;
960 }
961
962 void link_check_ready(Link *link) {
963 Address *a;
964 Iterator i;
965
966 assert(link);
967
968 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
969 return;
970
971 if (!link->network)
972 return;
973
974 if (!link->addresses_configured)
975 return;
976
977 if (!link->neighbors_configured)
978 return;
979
980 SET_FOREACH(a, link->addresses, i)
981 if (!address_is_ready(a))
982 return;
983
984 if (!link->addresses_ready) {
985 link->addresses_ready = true;
986 link_request_set_routes(link);
987 }
988
989 if (!link->static_routes_configured)
990 return;
991
992 if (!link->routing_policy_rules_configured)
993 return;
994
995 if (link_ipv4ll_enabled(link) && !(link->ipv4ll_address && link->ipv4ll_route))
996 return;
997
998 if (link_ipv6ll_enabled(link) &&
999 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
1000 return;
1001
1002 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
1003 !(link->dhcp4_configured || link->dhcp6_configured) &&
1004 !(link_ipv4ll_fallback_enabled(link) && link->ipv4ll_address && link->ipv4ll_route))
1005 /* When DHCP is enabled, at least one protocol must provide an address, or
1006 * an IPv4ll fallback address must be configured. */
1007 return;
1008
1009 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
1010 return;
1011
1012 if (link->state != LINK_STATE_CONFIGURED)
1013 link_enter_configured(link);
1014
1015 return;
1016 }
1017
1018 static int link_request_set_neighbors(Link *link) {
1019 Neighbor *neighbor;
1020 int r;
1021
1022 assert(link);
1023 assert(link->network);
1024 assert(link->state != _LINK_STATE_INVALID);
1025
1026 link_set_state(link, LINK_STATE_CONFIGURING);
1027 link->neighbors_configured = false;
1028
1029 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1030 r = neighbor_configure(neighbor, link, NULL);
1031 if (r < 0) {
1032 log_link_warning_errno(link, r, "Could not set neighbor: %m");
1033 link_enter_failed(link);
1034 return r;
1035 }
1036 }
1037
1038 if (link->neighbor_messages == 0) {
1039 link->neighbors_configured = true;
1040 link_check_ready(link);
1041 } else
1042 log_link_debug(link, "Setting neighbors");
1043
1044 return 0;
1045 }
1046
1047 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1048 int r;
1049
1050 assert(rtnl);
1051 assert(m);
1052 assert(link);
1053 assert(link->ifname);
1054 assert(link->address_messages > 0);
1055 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1056 LINK_STATE_FAILED, LINK_STATE_LINGER));
1057
1058 link->address_messages--;
1059
1060 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1061 return 1;
1062
1063 r = sd_netlink_message_get_errno(m);
1064 if (r < 0 && r != -EEXIST)
1065 log_link_warning_errno(link, r, "could not set address: %m");
1066 else if (r >= 0)
1067 manager_rtnl_process_address(rtnl, m, link->manager);
1068
1069 if (link->address_messages == 0) {
1070 log_link_debug(link, "Addresses set");
1071 link->addresses_configured = true;
1072 link_check_ready(link);
1073 }
1074
1075 return 1;
1076 }
1077
1078 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1079 _cleanup_free_ struct in_addr *addresses = NULL;
1080 size_t n_addresses = 0, n_allocated = 0;
1081 unsigned i;
1082
1083 log_debug("Copying DNS server information from %s", link->ifname);
1084
1085 if (!link->network)
1086 return 0;
1087
1088 for (i = 0; i < link->network->n_dns; i++) {
1089 struct in_addr ia;
1090
1091 /* Only look for IPv4 addresses */
1092 if (link->network->dns[i].family != AF_INET)
1093 continue;
1094
1095 ia = link->network->dns[i].address.in;
1096
1097 /* Never propagate obviously borked data */
1098 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1099 continue;
1100
1101 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1102 return log_oom();
1103
1104 addresses[n_addresses++] = ia;
1105 }
1106
1107 if (link->network->dhcp_use_dns && link->dhcp_lease) {
1108 const struct in_addr *da = NULL;
1109 int j, n;
1110
1111 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
1112 if (n > 0) {
1113
1114 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1115 return log_oom();
1116
1117 for (j = 0; j < n; j++)
1118 if (in4_addr_is_non_local(&da[j]))
1119 addresses[n_addresses++] = da[j];
1120 }
1121 }
1122
1123 if (n_addresses <= 0)
1124 return 0;
1125
1126 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
1127 }
1128
1129 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1130 _cleanup_free_ struct in_addr *addresses = NULL;
1131 size_t n_addresses = 0, n_allocated = 0;
1132 char **a;
1133
1134 if (!link->network)
1135 return 0;
1136
1137 log_debug("Copying NTP server information from %s", link->ifname);
1138
1139 STRV_FOREACH(a, link->network->ntp) {
1140 struct in_addr ia;
1141
1142 /* Only look for IPv4 addresses */
1143 if (inet_pton(AF_INET, *a, &ia) <= 0)
1144 continue;
1145
1146 /* Never propagate obviously borked data */
1147 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1148 continue;
1149
1150 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1151 return log_oom();
1152
1153 addresses[n_addresses++] = ia;
1154 }
1155
1156 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1157 const struct in_addr *da = NULL;
1158 int j, n;
1159
1160 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1161 if (n > 0) {
1162
1163 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1164 return log_oom();
1165
1166 for (j = 0; j < n; j++)
1167 if (in4_addr_is_non_local(&da[j]))
1168 addresses[n_addresses++] = da[j];
1169 }
1170 }
1171
1172 if (n_addresses <= 0)
1173 return 0;
1174
1175 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1176 }
1177
1178 static int link_set_bridge_fdb(Link *link) {
1179 FdbEntry *fdb_entry;
1180 int r;
1181
1182 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1183 r = fdb_entry_configure(link, fdb_entry);
1184 if (r < 0)
1185 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1186 }
1187
1188 return 0;
1189 }
1190
1191 static int link_request_set_addresses(Link *link) {
1192 AddressLabel *label;
1193 Address *ad;
1194 int r;
1195
1196 assert(link);
1197 assert(link->network);
1198 assert(link->state != _LINK_STATE_INVALID);
1199
1200 link_set_state(link, LINK_STATE_CONFIGURING);
1201
1202 /* Reset all *_configured flags we are configuring. */
1203 link->addresses_configured = false;
1204 link->addresses_ready = false;
1205 link->neighbors_configured = false;
1206 link->static_routes_configured = false;
1207 link->routing_policy_rules_configured = false;
1208
1209 r = link_set_bridge_fdb(link);
1210 if (r < 0)
1211 return r;
1212
1213 r = link_request_set_neighbors(link);
1214 if (r < 0)
1215 return r;
1216
1217 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1218 bool update;
1219
1220 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1221
1222 r = address_configure(ad, link, address_handler, update);
1223 if (r < 0) {
1224 log_link_warning_errno(link, r, "Could not set addresses: %m");
1225 link_enter_failed(link);
1226 return r;
1227 }
1228
1229 link->address_messages++;
1230 }
1231
1232 LIST_FOREACH(labels, label, link->network->address_labels) {
1233 r = address_label_configure(label, link, NULL, false);
1234 if (r < 0) {
1235 log_link_warning_errno(link, r, "Could not set address label: %m");
1236 link_enter_failed(link);
1237 return r;
1238 }
1239
1240 link->address_label_messages++;
1241 }
1242
1243 /* now that we can figure out a default address for the dhcp server,
1244 start it */
1245 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1246 Address *address;
1247 Link *uplink = NULL;
1248 bool acquired_uplink = false;
1249
1250 address = link_find_dhcp_server_address(link);
1251 if (!address) {
1252 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1253 link_enter_failed(link);
1254 return 0;
1255 }
1256
1257 /* use the server address' subnet as the pool */
1258 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1259 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1260 if (r < 0)
1261 return r;
1262
1263 /* TODO:
1264 r = sd_dhcp_server_set_router(link->dhcp_server,
1265 &main_address->in_addr.in);
1266 if (r < 0)
1267 return r;
1268 */
1269
1270 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1271 r = sd_dhcp_server_set_max_lease_time(
1272 link->dhcp_server,
1273 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1274 if (r < 0)
1275 return r;
1276 }
1277
1278 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1279 r = sd_dhcp_server_set_default_lease_time(
1280 link->dhcp_server,
1281 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1282 if (r < 0)
1283 return r;
1284 }
1285
1286 if (link->network->dhcp_server_emit_dns) {
1287
1288 if (link->network->n_dhcp_server_dns > 0)
1289 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1290 else {
1291 uplink = manager_find_uplink(link->manager, link);
1292 acquired_uplink = true;
1293
1294 if (!uplink) {
1295 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1296 r = 0;
1297 } else
1298 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1299 }
1300 if (r < 0)
1301 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1302 }
1303
1304 if (link->network->dhcp_server_emit_ntp) {
1305
1306 if (link->network->n_dhcp_server_ntp > 0)
1307 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1308 else {
1309 if (!acquired_uplink)
1310 uplink = manager_find_uplink(link->manager, link);
1311
1312 if (!uplink) {
1313 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1314 r = 0;
1315 } else
1316 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1317
1318 }
1319 if (r < 0)
1320 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1321 }
1322
1323 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1324 if (r < 0)
1325 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1326
1327 if (link->network->dhcp_server_emit_timezone) {
1328 _cleanup_free_ char *buffer = NULL;
1329 const char *tz = NULL;
1330
1331 if (link->network->dhcp_server_timezone)
1332 tz = link->network->dhcp_server_timezone;
1333 else {
1334 r = get_timezone(&buffer);
1335 if (r < 0)
1336 log_warning_errno(r, "Failed to determine timezone: %m");
1337 else
1338 tz = buffer;
1339 }
1340
1341 if (tz) {
1342 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1343 if (r < 0)
1344 return r;
1345 }
1346 }
1347 if (!sd_dhcp_server_is_running(link->dhcp_server)) {
1348 r = sd_dhcp_server_start(link->dhcp_server);
1349 if (r < 0) {
1350 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1351
1352 link_enter_failed(link);
1353
1354 return 0;
1355 }
1356 }
1357
1358 log_link_debug(link, "Offering DHCPv4 leases");
1359 }
1360
1361 if (link->address_messages == 0) {
1362 link->addresses_configured = true;
1363 link_check_ready(link);
1364 } else
1365 log_link_debug(link, "Setting addresses");
1366
1367 return 0;
1368 }
1369
1370 static int link_set_bridge_vlan(Link *link) {
1371 int r = 0;
1372
1373 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1374 if (r < 0)
1375 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1376
1377 return r;
1378 }
1379
1380 static int link_set_proxy_arp(Link *link) {
1381 int r;
1382
1383 if (!link_proxy_arp_enabled(link))
1384 return 0;
1385
1386 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1387 if (r < 0)
1388 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1389
1390 return 0;
1391 }
1392
1393 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1394 int r;
1395
1396 assert(link);
1397
1398 log_link_debug(link, "Set link");
1399
1400 r = sd_netlink_message_get_errno(m);
1401 if (r < 0 && r != -EEXIST) {
1402 log_link_error_errno(link, r, "Could not join netdev: %m");
1403 link_enter_failed(link);
1404 }
1405
1406 return 1;
1407 }
1408
1409 static int link_configure_after_setting_mtu(Link *link);
1410
1411 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1412 int r;
1413
1414 assert(m);
1415 assert(link);
1416 assert(link->ifname);
1417
1418 link->setting_mtu = false;
1419
1420 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1421 return 1;
1422
1423 r = sd_netlink_message_get_errno(m);
1424 if (r < 0) {
1425 log_link_warning_errno(link, r, "Could not set MTU: %m");
1426 return 1;
1427 }
1428
1429 log_link_debug(link, "Setting MTU done.");
1430
1431 if (link->state == LINK_STATE_INITIALIZED)
1432 (void) link_configure_after_setting_mtu(link);
1433
1434 return 1;
1435 }
1436
1437 int link_set_mtu(Link *link, uint32_t mtu, bool force) {
1438 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1439 int r;
1440
1441 assert(link);
1442 assert(link->manager);
1443 assert(link->manager->rtnl);
1444
1445 if (mtu == 0 || link->setting_mtu)
1446 return 0;
1447
1448 if (force ? link->mtu == mtu : link->mtu >= mtu)
1449 return 0;
1450
1451 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1452
1453 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1454 if (r < 0)
1455 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1456
1457 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1458 * for this interface, then disable IPv6 else enable it. */
1459 (void) link_enable_ipv6(link);
1460
1461 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1462 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1463 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1464
1465 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1466 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1467
1468 mtu = IPV6_MIN_MTU;
1469 }
1470
1471 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1472 if (r < 0)
1473 return log_link_error_errno(link, r, "Could not append MTU: %m");
1474
1475 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1476 link_netlink_destroy_callback, link);
1477 if (r < 0)
1478 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1479
1480 link_ref(link);
1481 link->setting_mtu = true;
1482
1483 return 0;
1484 }
1485
1486 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1487 int r;
1488
1489 assert(m);
1490 assert(link);
1491 assert(link->ifname);
1492
1493 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1494 return 1;
1495
1496 r = sd_netlink_message_get_errno(m);
1497 if (r < 0)
1498 log_link_warning_errno(link, r, "Could not set link flags: %m");
1499
1500 return 1;
1501 }
1502
1503 static int link_set_flags(Link *link) {
1504 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1505 unsigned ifi_change = 0;
1506 unsigned ifi_flags = 0;
1507 int r;
1508
1509 assert(link);
1510 assert(link->manager);
1511 assert(link->manager->rtnl);
1512
1513 if (link->flags & IFF_LOOPBACK)
1514 return 0;
1515
1516 if (!link->network)
1517 return 0;
1518
1519 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1520 return 0;
1521
1522 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1523 if (r < 0)
1524 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1525
1526 if (link->network->arp >= 0) {
1527 ifi_change |= IFF_NOARP;
1528 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1529 }
1530
1531 if (link->network->multicast >= 0) {
1532 ifi_change |= IFF_MULTICAST;
1533 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1534 }
1535
1536 if (link->network->allmulticast >= 0) {
1537 ifi_change |= IFF_ALLMULTI;
1538 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1539 }
1540
1541 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1542 if (r < 0)
1543 return log_link_error_errno(link, r, "Could not set link flags: %m");
1544
1545 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1546 link_netlink_destroy_callback, link);
1547 if (r < 0)
1548 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1549
1550 link_ref(link);
1551
1552 return 0;
1553 }
1554
1555 static int link_set_bridge(Link *link) {
1556 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1557 int r;
1558
1559 assert(link);
1560 assert(link->network);
1561
1562 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1563 if (r < 0)
1564 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1565
1566 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1567 if (r < 0)
1568 return log_link_error_errno(link, r, "Could not set message family: %m");
1569
1570 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1571 if (r < 0)
1572 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1573
1574 if (link->network->use_bpdu >= 0) {
1575 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
1576 if (r < 0)
1577 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1578 }
1579
1580 if (link->network->hairpin >= 0) {
1581 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1582 if (r < 0)
1583 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1584 }
1585
1586 if (link->network->fast_leave >= 0) {
1587 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1588 if (r < 0)
1589 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1590 }
1591
1592 if (link->network->allow_port_to_be_root >= 0) {
1593 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
1594 if (r < 0)
1595 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1596
1597 }
1598
1599 if (link->network->unicast_flood >= 0) {
1600 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1601 if (r < 0)
1602 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1603 }
1604
1605 if (link->network->multicast_flood >= 0) {
1606 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_FLOOD, link->network->multicast_flood);
1607 if (r < 0)
1608 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_FLOOD attribute: %m");
1609 }
1610
1611 if (link->network->multicast_to_unicast >= 0) {
1612 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_TO_UCAST, link->network->multicast_to_unicast);
1613 if (r < 0)
1614 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_TO_UCAST attribute: %m");
1615 }
1616
1617 if (link->network->neighbor_suppression >= 0) {
1618 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_NEIGH_SUPPRESS, link->network->neighbor_suppression);
1619 if (r < 0)
1620 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_NEIGH_SUPPRESS attribute: %m");
1621 }
1622
1623 if (link->network->learning >= 0) {
1624 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_LEARNING, link->network->learning);
1625 if (r < 0)
1626 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_LEARNING attribute: %m");
1627 }
1628
1629 if (link->network->cost != 0) {
1630 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1631 if (r < 0)
1632 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1633 }
1634
1635 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1636 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1637 if (r < 0)
1638 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1639 }
1640
1641 r = sd_netlink_message_close_container(req);
1642 if (r < 0)
1643 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1644
1645 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_handler,
1646 link_netlink_destroy_callback, link);
1647 if (r < 0)
1648 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1649
1650 link_ref(link);
1651
1652 return r;
1653 }
1654
1655 static int link_set_bond_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1656 int r;
1657
1658 assert(m);
1659 assert(link);
1660 assert(link->ifname);
1661
1662 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1663 return 1;
1664
1665 r = sd_netlink_message_get_errno(m);
1666 if (r < 0) {
1667 log_link_warning_errno(link, r, "Could not set bonding interface: %m");
1668 return 1;
1669 }
1670
1671 return 1;
1672 }
1673
1674 static int link_set_bond(Link *link) {
1675 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1676 int r;
1677
1678 assert(link);
1679 assert(link->network);
1680
1681 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1682 if (r < 0)
1683 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1684
1685 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1686 if (r < 0)
1687 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1688
1689 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1690 if (r < 0)
1691 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1692
1693 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1694 if (r < 0)
1695 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1696
1697 if (link->network->active_slave) {
1698 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1699 if (r < 0)
1700 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1701 }
1702
1703 if (link->network->primary_slave) {
1704 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1705 if (r < 0)
1706 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1707 }
1708
1709 r = sd_netlink_message_close_container(req);
1710 if (r < 0)
1711 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1712
1713 r = sd_netlink_message_close_container(req);
1714 if (r < 0)
1715 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1716
1717 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_bond_handler,
1718 link_netlink_destroy_callback, link);
1719 if (r < 0)
1720 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1721
1722 link_ref(link);
1723
1724 return r;
1725 }
1726
1727 static int link_lldp_save(Link *link) {
1728 _cleanup_free_ char *temp_path = NULL;
1729 _cleanup_fclose_ FILE *f = NULL;
1730 sd_lldp_neighbor **l = NULL;
1731 int n = 0, r, i;
1732
1733 assert(link);
1734 assert(link->lldp_file);
1735
1736 if (!link->lldp) {
1737 (void) unlink(link->lldp_file);
1738 return 0;
1739 }
1740
1741 r = sd_lldp_get_neighbors(link->lldp, &l);
1742 if (r < 0)
1743 goto finish;
1744 if (r == 0) {
1745 (void) unlink(link->lldp_file);
1746 goto finish;
1747 }
1748
1749 n = r;
1750
1751 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1752 if (r < 0)
1753 goto finish;
1754
1755 fchmod(fileno(f), 0644);
1756
1757 for (i = 0; i < n; i++) {
1758 const void *p;
1759 le64_t u;
1760 size_t sz;
1761
1762 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1763 if (r < 0)
1764 goto finish;
1765
1766 u = htole64(sz);
1767 (void) fwrite(&u, 1, sizeof(u), f);
1768 (void) fwrite(p, 1, sz, f);
1769 }
1770
1771 r = fflush_and_check(f);
1772 if (r < 0)
1773 goto finish;
1774
1775 if (rename(temp_path, link->lldp_file) < 0) {
1776 r = -errno;
1777 goto finish;
1778 }
1779
1780 finish:
1781 if (r < 0) {
1782 (void) unlink(link->lldp_file);
1783 if (temp_path)
1784 (void) unlink(temp_path);
1785
1786 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1787 }
1788
1789 if (l) {
1790 for (i = 0; i < n; i++)
1791 sd_lldp_neighbor_unref(l[i]);
1792 free(l);
1793 }
1794
1795 return r;
1796 }
1797
1798 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1799 Link *link = userdata;
1800 int r;
1801
1802 assert(link);
1803
1804 (void) link_lldp_save(link);
1805
1806 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1807 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1808
1809 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1810
1811 r = link_lldp_emit_start(link);
1812 if (r < 0)
1813 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1814 }
1815 }
1816
1817 static int link_acquire_ipv6_conf(Link *link) {
1818 int r;
1819
1820 assert(link);
1821
1822 if (link_ipv6_accept_ra_enabled(link)) {
1823 assert(link->ndisc);
1824
1825 log_link_debug(link, "Discovering IPv6 routers");
1826
1827 r = sd_ndisc_start(link->ndisc);
1828 if (r < 0 && r != -EBUSY)
1829 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1830 }
1831
1832 if (link_radv_enabled(link)) {
1833 assert(link->radv);
1834 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1835
1836 log_link_debug(link, "Starting IPv6 Router Advertisements");
1837
1838 r = sd_radv_start(link->radv);
1839 if (r < 0 && r != -EBUSY)
1840 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1841 }
1842
1843 (void) dhcp6_request_prefix_delegation(link);
1844
1845 return 0;
1846 }
1847
1848 static int link_acquire_ipv4_conf(Link *link) {
1849 int r;
1850
1851 assert(link);
1852 assert(link->manager);
1853 assert(link->manager->event);
1854
1855 if (link_ipv4ll_enabled(link)) {
1856 assert(link->ipv4ll);
1857
1858 log_link_debug(link, "Acquiring IPv4 link-local address");
1859
1860 r = sd_ipv4ll_start(link->ipv4ll);
1861 if (r < 0)
1862 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1863 }
1864
1865 if (link_dhcp4_enabled(link)) {
1866 assert(link->dhcp_client);
1867
1868 log_link_debug(link, "Acquiring DHCPv4 lease");
1869
1870 r = sd_dhcp_client_start(link->dhcp_client);
1871 if (r < 0)
1872 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1873 }
1874
1875 return 0;
1876 }
1877
1878 static int link_acquire_conf(Link *link) {
1879 int r;
1880
1881 assert(link);
1882
1883 r = link_acquire_ipv4_conf(link);
1884 if (r < 0)
1885 return r;
1886
1887 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1888 r = link_acquire_ipv6_conf(link);
1889 if (r < 0)
1890 return r;
1891 }
1892
1893 if (link_lldp_emit_enabled(link)) {
1894 r = link_lldp_emit_start(link);
1895 if (r < 0)
1896 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1897 }
1898
1899 return 0;
1900 }
1901
1902 bool link_has_carrier(Link *link) {
1903 /* see Documentation/networking/operstates.txt in the kernel sources */
1904
1905 if (link->kernel_operstate == IF_OPER_UP)
1906 return true;
1907
1908 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1909 /* operstate may not be implemented, so fall back to flags */
1910 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1911 return true;
1912
1913 return false;
1914 }
1915
1916 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1917 int r;
1918
1919 assert(link);
1920
1921 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1922 return 1;
1923
1924 r = sd_netlink_message_get_errno(m);
1925 if (r < 0)
1926 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1927
1928 return 1;
1929 }
1930
1931 static int link_configure_addrgen_mode(Link *link) {
1932 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1933 uint8_t ipv6ll_mode;
1934 int r;
1935
1936 assert(link);
1937 assert(link->network);
1938 assert(link->manager);
1939 assert(link->manager->rtnl);
1940
1941 log_link_debug(link, "Setting address genmode for link");
1942
1943 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1944 if (r < 0)
1945 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1946
1947 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1948 if (r < 0)
1949 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1950
1951 r = sd_netlink_message_open_container(req, AF_INET6);
1952 if (r < 0)
1953 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1954
1955 if (!link_ipv6ll_enabled(link))
1956 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1957 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1958 /* The file may not exist. And event if it exists, when stable_secret is unset,
1959 * reading the file fails with EIO. */
1960 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1961 else
1962 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1963
1964 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1965 if (r < 0)
1966 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1967
1968 r = sd_netlink_message_close_container(req);
1969 if (r < 0)
1970 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1971
1972 r = sd_netlink_message_close_container(req);
1973 if (r < 0)
1974 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1975
1976 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1977 link_netlink_destroy_callback, link);
1978 if (r < 0)
1979 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1980
1981 link_ref(link);
1982
1983 return 0;
1984 }
1985
1986 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1987 int r;
1988
1989 assert(link);
1990
1991 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1992 return 1;
1993
1994 r = sd_netlink_message_get_errno(m);
1995 if (r < 0)
1996 /* we warn but don't fail the link, as it may be brought up later */
1997 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1998
1999 return 1;
2000 }
2001
2002 static int link_up(Link *link) {
2003 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2004 int r;
2005
2006 assert(link);
2007 assert(link->network);
2008 assert(link->manager);
2009 assert(link->manager->rtnl);
2010
2011 log_link_debug(link, "Bringing link up");
2012
2013 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2014 if (r < 0)
2015 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2016
2017 /* set it free if not enslaved with networkd */
2018 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
2019 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
2020 if (r < 0)
2021 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
2022 }
2023
2024 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
2025 if (r < 0)
2026 return log_link_error_errno(link, r, "Could not set link flags: %m");
2027
2028 if (link->network->mac) {
2029 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
2030 if (r < 0)
2031 return log_link_error_errno(link, r, "Could not set MAC address: %m");
2032 }
2033
2034 if (link_ipv6_enabled(link)) {
2035 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
2036 if (r < 0)
2037 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
2038
2039 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
2040 r = sd_netlink_message_open_container(req, AF_INET6);
2041 if (r < 0)
2042 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
2043
2044 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
2045 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
2046 if (r < 0)
2047 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
2048 }
2049
2050 r = sd_netlink_message_close_container(req);
2051 if (r < 0)
2052 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
2053
2054 r = sd_netlink_message_close_container(req);
2055 if (r < 0)
2056 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
2057 }
2058
2059 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2060 link_netlink_destroy_callback, link);
2061 if (r < 0)
2062 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2063
2064 link_ref(link);
2065
2066 return 0;
2067 }
2068
2069 static int link_up_can(Link *link) {
2070 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2071 int r;
2072
2073 assert(link);
2074
2075 log_link_debug(link, "Bringing CAN link up");
2076
2077 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2078 if (r < 0)
2079 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2080
2081 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
2082 if (r < 0)
2083 return log_link_error_errno(link, r, "Could not set link flags: %m");
2084
2085 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2086 link_netlink_destroy_callback, link);
2087 if (r < 0)
2088 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2089
2090 link_ref(link);
2091
2092 return 0;
2093 }
2094
2095 static int link_set_can(Link *link) {
2096 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
2097 int r;
2098
2099 assert(link);
2100 assert(link->network);
2101 assert(link->manager);
2102 assert(link->manager->rtnl);
2103
2104 log_link_debug(link, "link_set_can");
2105
2106 r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
2107 if (r < 0)
2108 return log_link_error_errno(link, r, "Failed to allocate netlink message: %m");
2109
2110 r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
2111 if (r < 0)
2112 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
2113
2114 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
2115 if (r < 0)
2116 return log_link_error_errno(link, r, "Failed to open netlink container: %m");
2117
2118 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
2119 if (r < 0)
2120 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
2121
2122 if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) {
2123 struct can_bittiming bt = {
2124 .bitrate = link->network->can_bitrate,
2125 .sample_point = link->network->can_sample_point,
2126 };
2127
2128 if (link->network->can_bitrate > UINT32_MAX) {
2129 log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate);
2130 return -ERANGE;
2131 }
2132
2133 log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate);
2134 if (link->network->can_sample_point > 0)
2135 log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
2136 else
2137 log_link_debug(link, "Using default sample point");
2138
2139 r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
2140 if (r < 0)
2141 return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
2142 }
2143
2144 if (link->network->can_restart_us > 0) {
2145 char time_string[FORMAT_TIMESPAN_MAX];
2146 uint64_t restart_ms;
2147
2148 if (link->network->can_restart_us == USEC_INFINITY)
2149 restart_ms = 0;
2150 else
2151 restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC);
2152
2153 format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC);
2154
2155 if (restart_ms > UINT32_MAX) {
2156 log_link_error(link, "restart timeout (%s) too big.", time_string);
2157 return -ERANGE;
2158 }
2159
2160 log_link_debug(link, "Setting restart = %s", time_string);
2161
2162 r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
2163 if (r < 0)
2164 return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
2165 }
2166
2167 if (link->network->can_triple_sampling >= 0) {
2168 struct can_ctrlmode cm = {
2169 .mask = CAN_CTRLMODE_3_SAMPLES,
2170 .flags = link->network->can_triple_sampling ? CAN_CTRLMODE_3_SAMPLES : 0,
2171 };
2172
2173 log_link_debug(link, "%sabling triple-sampling", link->network->can_triple_sampling ? "En" : "Dis");
2174
2175 r = sd_netlink_message_append_data(m, IFLA_CAN_CTRLMODE, &cm, sizeof(cm));
2176 if (r < 0)
2177 return log_link_error_errno(link, r, "Could not append IFLA_CAN_CTRLMODE attribute: %m");
2178 }
2179
2180 r = sd_netlink_message_close_container(m);
2181 if (r < 0)
2182 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2183
2184 r = sd_netlink_message_close_container(m);
2185 if (r < 0)
2186 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2187
2188 r = netlink_call_async(link->manager->rtnl, NULL, m, link_set_handler,
2189 link_netlink_destroy_callback, link);
2190 if (r < 0)
2191 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2192
2193 link_ref(link);
2194
2195 if (!(link->flags & IFF_UP)) {
2196 r = link_up_can(link);
2197 if (r < 0) {
2198 link_enter_failed(link);
2199 return r;
2200 }
2201 }
2202
2203 log_link_debug(link, "link_set_can done");
2204
2205 return r;
2206 }
2207
2208 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2209 int r;
2210
2211 assert(link);
2212
2213 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2214 return 1;
2215
2216 r = sd_netlink_message_get_errno(m);
2217 if (r < 0)
2218 log_link_warning_errno(link, r, "Could not bring down interface: %m");
2219
2220 if (streq_ptr(link->kind, "can"))
2221 link_set_can(link);
2222
2223 return 1;
2224 }
2225
2226 int link_down(Link *link) {
2227 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2228 int r;
2229
2230 assert(link);
2231 assert(link->manager);
2232 assert(link->manager->rtnl);
2233
2234 log_link_debug(link, "Bringing link down");
2235
2236 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
2237 RTM_SETLINK, link->ifindex);
2238 if (r < 0)
2239 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2240
2241 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
2242 if (r < 0)
2243 return log_link_error_errno(link, r, "Could not set link flags: %m");
2244
2245 r = netlink_call_async(link->manager->rtnl, NULL, req, link_down_handler,
2246 link_netlink_destroy_callback, link);
2247 if (r < 0)
2248 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2249
2250 link_ref(link);
2251
2252 return 0;
2253 }
2254
2255 static int link_handle_bound_to_list(Link *link) {
2256 Link *l;
2257 Iterator i;
2258 int r;
2259 bool required_up = false;
2260 bool link_is_up = false;
2261
2262 assert(link);
2263
2264 if (hashmap_isempty(link->bound_to_links))
2265 return 0;
2266
2267 if (link->flags & IFF_UP)
2268 link_is_up = true;
2269
2270 HASHMAP_FOREACH (l, link->bound_to_links, i)
2271 if (link_has_carrier(l)) {
2272 required_up = true;
2273 break;
2274 }
2275
2276 if (!required_up && link_is_up) {
2277 r = link_down(link);
2278 if (r < 0)
2279 return r;
2280 } else if (required_up && !link_is_up) {
2281 r = link_up(link);
2282 if (r < 0)
2283 return r;
2284 }
2285
2286 return 0;
2287 }
2288
2289 static int link_handle_bound_by_list(Link *link) {
2290 Iterator i;
2291 Link *l;
2292 int r;
2293
2294 assert(link);
2295
2296 if (hashmap_isempty(link->bound_by_links))
2297 return 0;
2298
2299 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2300 r = link_handle_bound_to_list(l);
2301 if (r < 0)
2302 return r;
2303 }
2304
2305 return 0;
2306 }
2307
2308 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2309 int r;
2310
2311 assert(link);
2312 assert(carrier);
2313
2314 if (link == carrier)
2315 return 0;
2316
2317 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2318 return 0;
2319
2320 r = hashmap_ensure_allocated(h, NULL);
2321 if (r < 0)
2322 return r;
2323
2324 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2325 if (r < 0)
2326 return r;
2327
2328 return 0;
2329 }
2330
2331 static int link_new_bound_by_list(Link *link) {
2332 Manager *m;
2333 Link *carrier;
2334 Iterator i;
2335 int r;
2336 bool list_updated = false;
2337
2338 assert(link);
2339 assert(link->manager);
2340
2341 m = link->manager;
2342
2343 HASHMAP_FOREACH(carrier, m->links, i) {
2344 if (!carrier->network)
2345 continue;
2346
2347 if (strv_isempty(carrier->network->bind_carrier))
2348 continue;
2349
2350 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2351 r = link_put_carrier(link, carrier, &link->bound_by_links);
2352 if (r < 0)
2353 return r;
2354
2355 list_updated = true;
2356 }
2357 }
2358
2359 if (list_updated)
2360 link_dirty(link);
2361
2362 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2363 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2364 if (r < 0)
2365 return r;
2366
2367 link_dirty(carrier);
2368 }
2369
2370 return 0;
2371 }
2372
2373 static int link_new_bound_to_list(Link *link) {
2374 Manager *m;
2375 Link *carrier;
2376 Iterator i;
2377 int r;
2378 bool list_updated = false;
2379
2380 assert(link);
2381 assert(link->manager);
2382
2383 if (!link->network)
2384 return 0;
2385
2386 if (strv_isempty(link->network->bind_carrier))
2387 return 0;
2388
2389 m = link->manager;
2390
2391 HASHMAP_FOREACH (carrier, m->links, i) {
2392 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2393 r = link_put_carrier(link, carrier, &link->bound_to_links);
2394 if (r < 0)
2395 return r;
2396
2397 list_updated = true;
2398 }
2399 }
2400
2401 if (list_updated)
2402 link_dirty(link);
2403
2404 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2405 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2406 if (r < 0)
2407 return r;
2408
2409 link_dirty(carrier);
2410 }
2411
2412 return 0;
2413 }
2414
2415 static int link_new_carrier_maps(Link *link) {
2416 int r;
2417
2418 r = link_new_bound_by_list(link);
2419 if (r < 0)
2420 return r;
2421
2422 r = link_handle_bound_by_list(link);
2423 if (r < 0)
2424 return r;
2425
2426 r = link_new_bound_to_list(link);
2427 if (r < 0)
2428 return r;
2429
2430 r = link_handle_bound_to_list(link);
2431 if (r < 0)
2432 return r;
2433
2434 return 0;
2435 }
2436
2437 static void link_free_bound_to_list(Link *link) {
2438 Link *bound_to;
2439 Iterator i;
2440
2441 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2442 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2443
2444 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2445 link_dirty(bound_to);
2446 }
2447
2448 return;
2449 }
2450
2451 static void link_free_bound_by_list(Link *link) {
2452 Link *bound_by;
2453 Iterator i;
2454
2455 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2456 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2457
2458 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2459 link_dirty(bound_by);
2460 link_handle_bound_to_list(bound_by);
2461 }
2462 }
2463
2464 return;
2465 }
2466
2467 static void link_free_carrier_maps(Link *link) {
2468 bool list_updated = false;
2469
2470 assert(link);
2471
2472 if (!hashmap_isempty(link->bound_to_links)) {
2473 link_free_bound_to_list(link);
2474 list_updated = true;
2475 }
2476
2477 if (!hashmap_isempty(link->bound_by_links)) {
2478 link_free_bound_by_list(link);
2479 list_updated = true;
2480 }
2481
2482 if (list_updated)
2483 link_dirty(link);
2484
2485 return;
2486 }
2487
2488 static int link_append_to_master(Link *link, NetDev *netdev) {
2489 Link *master;
2490 int r;
2491
2492 assert(link);
2493 assert(netdev);
2494
2495 r = link_get(link->manager, netdev->ifindex, &master);
2496 if (r < 0)
2497 return r;
2498
2499 r = set_ensure_allocated(&master->slaves, NULL);
2500 if (r < 0)
2501 return r;
2502
2503 r = set_put(master->slaves, link);
2504 if (r < 0)
2505 return r;
2506
2507 link_ref(link);
2508 return 0;
2509 }
2510
2511 static void link_drop_from_master(Link *link, NetDev *netdev) {
2512 Link *master;
2513
2514 assert(link);
2515
2516 if (!link->manager || !netdev)
2517 return;
2518
2519 if (link_get(link->manager, netdev->ifindex, &master) < 0)
2520 return;
2521
2522 link_unref(set_remove(master->slaves, link));
2523 }
2524
2525 static void link_detach_from_manager(Link *link) {
2526 if (!link || !link->manager)
2527 return;
2528
2529 link_unref(set_remove(link->manager->links_requesting_uuid, link));
2530 link_clean(link);
2531
2532 /* The following must be called at last. */
2533 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2534 link_unref(link);
2535 }
2536
2537 void link_drop(Link *link) {
2538 if (!link || link->state == LINK_STATE_LINGER)
2539 return;
2540
2541 link_set_state(link, LINK_STATE_LINGER);
2542
2543 link_free_carrier_maps(link);
2544
2545 if (link->network) {
2546 link_drop_from_master(link, link->network->bridge);
2547 link_drop_from_master(link, link->network->bond);
2548 }
2549
2550 log_link_debug(link, "Link removed");
2551
2552 (void) unlink(link->state_file);
2553 link_detach_from_manager(link);
2554 }
2555
2556 static int link_joined(Link *link) {
2557 int r;
2558
2559 assert(link);
2560 assert(link->network);
2561
2562 if (!hashmap_isempty(link->bound_to_links)) {
2563 r = link_handle_bound_to_list(link);
2564 if (r < 0)
2565 return r;
2566 } else if (!(link->flags & IFF_UP)) {
2567 r = link_up(link);
2568 if (r < 0) {
2569 link_enter_failed(link);
2570 return r;
2571 }
2572 }
2573
2574 if (link->network->bridge) {
2575 r = link_set_bridge(link);
2576 if (r < 0)
2577 log_link_error_errno(link, r, "Could not set bridge message: %m");
2578
2579 r = link_append_to_master(link, link->network->bridge);
2580 if (r < 0)
2581 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2582 }
2583
2584 if (link->network->bond) {
2585 r = link_set_bond(link);
2586 if (r < 0)
2587 log_link_error_errno(link, r, "Could not set bond message: %m");
2588
2589 r = link_append_to_master(link, link->network->bond);
2590 if (r < 0)
2591 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2592 }
2593
2594 if (link->network->use_br_vlan &&
2595 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2596 r = link_set_bridge_vlan(link);
2597 if (r < 0)
2598 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2599 }
2600
2601 /* Skip setting up addresses until it gets carrier,
2602 or it would try to set addresses twice,
2603 which is bad for non-idempotent steps. */
2604 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2605 return 0;
2606
2607 return link_request_set_addresses(link);
2608 }
2609
2610 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2611 int r;
2612
2613 assert(link);
2614 assert(link->network);
2615 assert(link->enslaving > 0);
2616 assert(!link->enslaved_raw);
2617
2618 link->enslaving--;
2619
2620 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2621 return 1;
2622
2623 r = sd_netlink_message_get_errno(m);
2624 if (r < 0 && r != -EEXIST) {
2625 log_link_error_errno(link, r, "Could not join netdev: %m");
2626 link_enter_failed(link);
2627 return 1;
2628 } else
2629 log_link_debug(link, "Joined netdev");
2630
2631 if (link->enslaving == 0) {
2632 link->enslaved_raw = true;
2633 link_joined(link);
2634 }
2635
2636 return 1;
2637 }
2638
2639 static int link_enter_join_netdev(Link *link) {
2640 NetDev *netdev;
2641 Iterator i;
2642 int r;
2643
2644 assert(link);
2645 assert(link->network);
2646 assert(link->state == LINK_STATE_INITIALIZED);
2647
2648 link_set_state(link, LINK_STATE_CONFIGURING);
2649
2650 link_dirty(link);
2651 link->enslaving = 0;
2652 link->enslaved_raw = false;
2653
2654 if (link->network->bond) {
2655 if (link->network->bond->state == NETDEV_STATE_READY &&
2656 link->network->bond->ifindex == link->master_ifindex)
2657 return link_joined(link);
2658
2659 log_struct(LOG_DEBUG,
2660 LOG_LINK_INTERFACE(link),
2661 LOG_NETDEV_INTERFACE(link->network->bond),
2662 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2663
2664 link->enslaving++;
2665
2666 r = netdev_join(link->network->bond, link, netdev_join_handler);
2667 if (r < 0) {
2668 log_struct_errno(LOG_WARNING, r,
2669 LOG_LINK_INTERFACE(link),
2670 LOG_NETDEV_INTERFACE(link->network->bond),
2671 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2672 link_enter_failed(link);
2673 return r;
2674 }
2675 }
2676
2677 if (link->network->bridge) {
2678 log_struct(LOG_DEBUG,
2679 LOG_LINK_INTERFACE(link),
2680 LOG_NETDEV_INTERFACE(link->network->bridge),
2681 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2682
2683 link->enslaving++;
2684
2685 r = netdev_join(link->network->bridge, 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->bridge),
2690 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2691 link_enter_failed(link);
2692 return r;
2693 }
2694 }
2695
2696 if (link->network->vrf) {
2697 log_struct(LOG_DEBUG,
2698 LOG_LINK_INTERFACE(link),
2699 LOG_NETDEV_INTERFACE(link->network->vrf),
2700 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2701
2702 link->enslaving++;
2703
2704 r = netdev_join(link->network->vrf, 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->vrf),
2709 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2710 link_enter_failed(link);
2711 return r;
2712 }
2713 }
2714
2715 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2716
2717 if (netdev->ifindex > 0)
2718 /* Assume already enslaved. */
2719 continue;
2720
2721 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2722 continue;
2723
2724 log_struct(LOG_DEBUG,
2725 LOG_LINK_INTERFACE(link),
2726 LOG_NETDEV_INTERFACE(netdev),
2727 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2728
2729 link->enslaving++;
2730
2731 r = netdev_join(netdev, link, netdev_join_handler);
2732 if (r < 0) {
2733 log_struct_errno(LOG_WARNING, r,
2734 LOG_LINK_INTERFACE(link),
2735 LOG_NETDEV_INTERFACE(netdev),
2736 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2737 link_enter_failed(link);
2738 return r;
2739 }
2740 }
2741
2742 if (link->enslaving == 0)
2743 return link_joined(link);
2744
2745 return 0;
2746 }
2747
2748 static int link_set_ipv4_forward(Link *link) {
2749 int r;
2750
2751 if (!link_ipv4_forward_enabled(link))
2752 return 0;
2753
2754 /* We propagate the forwarding flag from one interface to the
2755 * global setting one way. This means: as long as at least one
2756 * interface was configured at any time that had IP forwarding
2757 * enabled the setting will stay on for good. We do this
2758 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2759 * somewhat in sync (see below). */
2760
2761 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2762 if (r < 0)
2763 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2764
2765 return 0;
2766 }
2767
2768 static int link_set_ipv6_forward(Link *link) {
2769 int r;
2770
2771 if (!link_ipv6_forward_enabled(link))
2772 return 0;
2773
2774 /* On Linux, the IPv6 stack does not know a per-interface
2775 * packet forwarding setting: either packet forwarding is on
2776 * for all, or off for all. We hence don't bother with a
2777 * per-interface setting, but simply propagate the interface
2778 * flag, if it is set, to the global flag, one-way. Note that
2779 * while IPv4 would allow a per-interface flag, we expose the
2780 * same behaviour there and also propagate the setting from
2781 * one to all, to keep things simple (see above). */
2782
2783 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2784 if (r < 0)
2785 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2786
2787 return 0;
2788 }
2789
2790 static int link_set_ipv6_privacy_extensions(Link *link) {
2791 IPv6PrivacyExtensions s;
2792 int r;
2793
2794 s = link_ipv6_privacy_extensions(link);
2795 if (s < 0)
2796 return 0;
2797
2798 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2799 if (r < 0)
2800 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2801
2802 return 0;
2803 }
2804
2805 static int link_set_ipv6_accept_ra(Link *link) {
2806 int r;
2807
2808 /* Make this a NOP if IPv6 is not available */
2809 if (!socket_ipv6_is_supported())
2810 return 0;
2811
2812 if (link->flags & IFF_LOOPBACK)
2813 return 0;
2814
2815 if (!link->network)
2816 return 0;
2817
2818 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2819 if (r < 0)
2820 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2821
2822 return 0;
2823 }
2824
2825 static int link_set_ipv6_dad_transmits(Link *link) {
2826 int r;
2827
2828 /* Make this a NOP if IPv6 is not available */
2829 if (!socket_ipv6_is_supported())
2830 return 0;
2831
2832 if (link->flags & IFF_LOOPBACK)
2833 return 0;
2834
2835 if (!link->network)
2836 return 0;
2837
2838 if (link->network->ipv6_dad_transmits < 0)
2839 return 0;
2840
2841 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2842 if (r < 0)
2843 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2844
2845 return 0;
2846 }
2847
2848 static int link_set_ipv6_hop_limit(Link *link) {
2849 int r;
2850
2851 /* Make this a NOP if IPv6 is not available */
2852 if (!socket_ipv6_is_supported())
2853 return 0;
2854
2855 if (link->flags & IFF_LOOPBACK)
2856 return 0;
2857
2858 if (!link->network)
2859 return 0;
2860
2861 if (link->network->ipv6_hop_limit < 0)
2862 return 0;
2863
2864 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2865 if (r < 0)
2866 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2867
2868 return 0;
2869 }
2870
2871 static int link_set_ipv6_mtu(Link *link) {
2872 int r;
2873
2874 /* Make this a NOP if IPv6 is not available */
2875 if (!socket_ipv6_is_supported())
2876 return 0;
2877
2878 if (link->flags & IFF_LOOPBACK)
2879 return 0;
2880
2881 if (link->network->ipv6_mtu == 0)
2882 return 0;
2883
2884 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2885 if (r < 0)
2886 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2887
2888 return 0;
2889 }
2890
2891 static bool link_is_static_address_configured(Link *link, Address *address) {
2892 Address *net_address;
2893
2894 assert(link);
2895 assert(address);
2896
2897 if (!link->network)
2898 return false;
2899
2900 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2901 if (address_equal(net_address, address))
2902 return true;
2903
2904 return false;
2905 }
2906
2907 static bool link_is_static_route_configured(Link *link, Route *route) {
2908 Route *net_route;
2909
2910 assert(link);
2911 assert(route);
2912
2913 if (!link->network)
2914 return false;
2915
2916 LIST_FOREACH(routes, net_route, link->network->static_routes)
2917 if (route_equal(net_route, route))
2918 return true;
2919
2920 return false;
2921 }
2922
2923 static int link_drop_foreign_config(Link *link) {
2924 Address *address;
2925 Route *route;
2926 Iterator i;
2927 int r;
2928
2929 SET_FOREACH(address, link->addresses_foreign, i) {
2930 /* we consider IPv6LL addresses to be managed by the kernel */
2931 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2932 continue;
2933
2934 if (link_is_static_address_configured(link, address)) {
2935 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2936 if (r < 0)
2937 return log_link_error_errno(link, r, "Failed to add address: %m");
2938 } else {
2939 r = address_remove(address, link, NULL);
2940 if (r < 0)
2941 return r;
2942 }
2943 }
2944
2945 SET_FOREACH(route, link->routes_foreign, i) {
2946 /* do not touch routes managed by the kernel */
2947 if (route->protocol == RTPROT_KERNEL)
2948 continue;
2949
2950 if (link_is_static_route_configured(link, route)) {
2951 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2952 if (r < 0)
2953 return r;
2954 } else {
2955 r = route_remove(route, link, NULL);
2956 if (r < 0)
2957 return r;
2958 }
2959 }
2960
2961 return 0;
2962 }
2963
2964 static int link_drop_config(Link *link) {
2965 Address *address, *pool_address;
2966 Route *route;
2967 Iterator i;
2968 int r;
2969
2970 SET_FOREACH(address, link->addresses, i) {
2971 /* we consider IPv6LL addresses to be managed by the kernel */
2972 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2973 continue;
2974
2975 r = address_remove(address, link, NULL);
2976 if (r < 0)
2977 return r;
2978
2979 /* If this address came from an address pool, clean up the pool */
2980 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2981 if (address_equal(address, pool_address)) {
2982 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2983 address_free(pool_address);
2984 break;
2985 }
2986 }
2987 }
2988
2989 SET_FOREACH(route, link->routes, i) {
2990 /* do not touch routes managed by the kernel */
2991 if (route->protocol == RTPROT_KERNEL)
2992 continue;
2993
2994 r = route_remove(route, link, NULL);
2995 if (r < 0)
2996 return r;
2997 }
2998
2999 ndisc_flush(link);
3000
3001 return 0;
3002 }
3003
3004 static int link_update_lldp(Link *link) {
3005 int r;
3006
3007 assert(link);
3008
3009 if (!link->lldp)
3010 return 0;
3011
3012 if (link->flags & IFF_UP) {
3013 r = sd_lldp_start(link->lldp);
3014 if (r > 0)
3015 log_link_debug(link, "Started LLDP.");
3016 } else {
3017 r = sd_lldp_stop(link->lldp);
3018 if (r > 0)
3019 log_link_debug(link, "Stopped LLDP.");
3020 }
3021
3022 return r;
3023 }
3024
3025 static int link_configure_can(Link *link) {
3026 int r;
3027
3028 if (streq_ptr(link->kind, "can")) {
3029 /* The CAN interface must be down to configure bitrate, etc... */
3030 if ((link->flags & IFF_UP)) {
3031 r = link_down(link);
3032 if (r < 0) {
3033 link_enter_failed(link);
3034 return r;
3035 }
3036
3037 return 0;
3038 }
3039
3040 return link_set_can(link);
3041 }
3042
3043 if (!(link->flags & IFF_UP)) {
3044 r = link_up_can(link);
3045 if (r < 0) {
3046 link_enter_failed(link);
3047 return r;
3048 }
3049 }
3050
3051 return 0;
3052 }
3053
3054 static int link_configure(Link *link) {
3055 int r;
3056
3057 assert(link);
3058 assert(link->network);
3059 assert(link->state == LINK_STATE_INITIALIZED);
3060
3061 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
3062 return link_configure_can(link);
3063
3064 /* Drop foreign config, but ignore loopback or critical devices.
3065 * We do not want to remove loopback address or addresses used for root NFS. */
3066 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
3067 r = link_drop_foreign_config(link);
3068 if (r < 0)
3069 return r;
3070 }
3071
3072 r = link_set_proxy_arp(link);
3073 if (r < 0)
3074 return r;
3075
3076 r = ipv6_proxy_ndp_addresses_configure(link);
3077 if (r < 0)
3078 return r;
3079
3080 r = link_set_ipv4_forward(link);
3081 if (r < 0)
3082 return r;
3083
3084 r = link_set_ipv6_forward(link);
3085 if (r < 0)
3086 return r;
3087
3088 r = link_set_ipv6_privacy_extensions(link);
3089 if (r < 0)
3090 return r;
3091
3092 r = link_set_ipv6_accept_ra(link);
3093 if (r < 0)
3094 return r;
3095
3096 r = link_set_ipv6_dad_transmits(link);
3097 if (r < 0)
3098 return r;
3099
3100 r = link_set_ipv6_hop_limit(link);
3101 if (r < 0)
3102 return r;
3103
3104 r = link_set_flags(link);
3105 if (r < 0)
3106 return r;
3107
3108 r = link_set_ipv6_mtu(link);
3109 if (r < 0)
3110 return r;
3111
3112 if (link_ipv4ll_enabled(link) || link_ipv4ll_fallback_enabled(link)) {
3113 r = ipv4ll_configure(link);
3114 if (r < 0)
3115 return r;
3116 }
3117
3118 if (link_dhcp4_enabled(link)) {
3119 r = dhcp4_set_promote_secondaries(link);
3120 if (r < 0)
3121 return r;
3122
3123 r = dhcp4_configure(link);
3124 if (r < 0)
3125 return r;
3126 }
3127
3128 if (link_dhcp4_server_enabled(link)) {
3129 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
3130 if (r < 0)
3131 return r;
3132
3133 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
3134 if (r < 0)
3135 return r;
3136 }
3137
3138 if (link_dhcp6_enabled(link) ||
3139 link_ipv6_accept_ra_enabled(link)) {
3140 r = dhcp6_configure(link);
3141 if (r < 0)
3142 return r;
3143 }
3144
3145 if (link_ipv6_accept_ra_enabled(link)) {
3146 r = ndisc_configure(link);
3147 if (r < 0)
3148 return r;
3149 }
3150
3151 if (link_radv_enabled(link)) {
3152 r = radv_configure(link);
3153 if (r < 0)
3154 return r;
3155 }
3156
3157 if (link_lldp_rx_enabled(link)) {
3158 r = sd_lldp_new(&link->lldp);
3159 if (r < 0)
3160 return r;
3161
3162 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
3163 if (r < 0)
3164 return r;
3165
3166 r = sd_lldp_match_capabilities(link->lldp,
3167 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
3168 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
3169 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
3170 if (r < 0)
3171 return r;
3172
3173 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
3174 if (r < 0)
3175 return r;
3176
3177 r = sd_lldp_attach_event(link->lldp, NULL, 0);
3178 if (r < 0)
3179 return r;
3180
3181 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
3182 if (r < 0)
3183 return r;
3184
3185 r = link_update_lldp(link);
3186 if (r < 0)
3187 return r;
3188 }
3189
3190 r = link_set_mtu(link, link->network->mtu, link->network->mtu_is_set);
3191 if (r < 0)
3192 return r;
3193
3194 if (socket_ipv6_is_supported()) {
3195 r = link_configure_addrgen_mode(link);
3196 if (r < 0)
3197 return r;
3198 }
3199
3200 return link_configure_after_setting_mtu(link);
3201 }
3202
3203 static int link_configure_after_setting_mtu(Link *link) {
3204 int r;
3205
3206 assert(link);
3207 assert(link->network);
3208 assert(link->state == LINK_STATE_INITIALIZED);
3209
3210 if (link->setting_mtu)
3211 return 0;
3212
3213 if (link_has_carrier(link) || link->network->configure_without_carrier) {
3214 r = link_acquire_conf(link);
3215 if (r < 0)
3216 return r;
3217 }
3218
3219 return link_enter_join_netdev(link);
3220 }
3221
3222 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3223 assert(duid);
3224
3225 if (duid->raw_data_len > 0)
3226 return 0;
3227
3228 if (duid->type != DUID_TYPE_UUID)
3229 return -EINVAL;
3230
3231 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3232 duid->raw_data_len = sizeof(sd_id128_t);
3233
3234 return 1;
3235 }
3236
3237 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3238 Manager *manager = userdata;
3239 const sd_bus_error *e;
3240 const void *a;
3241 size_t sz;
3242 DUID *duid;
3243 Link *link;
3244 int r;
3245
3246 assert(m);
3247 assert(manager);
3248
3249 e = sd_bus_message_get_error(m);
3250 if (e) {
3251 log_error_errno(sd_bus_error_get_errno(e),
3252 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3253 e->message);
3254 goto configure;
3255 }
3256
3257 r = sd_bus_message_read_array(m, 'y', &a, &sz);
3258 if (r < 0)
3259 goto configure;
3260
3261 if (sz != sizeof(sd_id128_t)) {
3262 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3263 goto configure;
3264 }
3265
3266 memcpy(&manager->product_uuid, a, sz);
3267 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3268 (void) duid_set_uuid(duid, manager->product_uuid);
3269
3270 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3271
3272 configure:
3273 while ((link = set_steal_first(manager->links_requesting_uuid))) {
3274 r = link_configure(link);
3275 if (r < 0)
3276 log_link_error_errno(link, r, "Failed to configure link: %m");
3277 }
3278
3279 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3280
3281 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3282 * even if the method fails. */
3283 manager->has_product_uuid = true;
3284
3285 return 1;
3286 }
3287
3288 static bool link_requires_uuid(Link *link) {
3289 const DUID *duid;
3290
3291 assert(link);
3292 assert(link->manager);
3293 assert(link->network);
3294
3295 duid = link_get_duid(link);
3296 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3297 return false;
3298
3299 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3300 return true;
3301
3302 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3303 return true;
3304
3305 return false;
3306 }
3307
3308 static int link_configure_duid(Link *link) {
3309 Manager *m;
3310 DUID *duid;
3311 int r;
3312
3313 assert(link);
3314 assert(link->manager);
3315 assert(link->network);
3316
3317 m = link->manager;
3318 duid = link_get_duid(link);
3319
3320 if (!link_requires_uuid(link))
3321 return 1;
3322
3323 if (m->has_product_uuid) {
3324 (void) duid_set_uuid(duid, m->product_uuid);
3325 return 1;
3326 }
3327
3328 if (!m->links_requesting_uuid) {
3329 r = manager_request_product_uuid(m, link);
3330 if (r < 0) {
3331 if (r == -ENOMEM)
3332 return r;
3333
3334 log_link_warning_errno(link, r,
3335 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3336 return 1;
3337 }
3338 } else {
3339 r = set_put(m->links_requesting_uuid, link);
3340 if (r < 0)
3341 return log_oom();
3342
3343 r = set_put(m->duids_requesting_uuid, duid);
3344 if (r < 0)
3345 return log_oom();
3346 }
3347
3348 return 0;
3349 }
3350
3351 static int link_initialized_and_synced(Link *link) {
3352 Network *network;
3353 int r;
3354
3355 assert(link);
3356 assert(link->ifname);
3357 assert(link->manager);
3358
3359 /* We may get called either from the asynchronous netlink callback,
3360 * or directly for link_add() if running in a container. See link_add(). */
3361 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3362 return 0;
3363
3364 log_link_debug(link, "Link state is up-to-date");
3365 link_set_state(link, LINK_STATE_INITIALIZED);
3366
3367 r = link_new_bound_by_list(link);
3368 if (r < 0)
3369 return r;
3370
3371 r = link_handle_bound_by_list(link);
3372 if (r < 0)
3373 return r;
3374
3375 if (!link->network) {
3376 r = network_get(link->manager, link->sd_device, link->ifname,
3377 &link->mac, &network);
3378 if (r == -ENOENT) {
3379 link_enter_unmanaged(link);
3380 return 0;
3381 } else if (r == 0 && network->unmanaged) {
3382 link_enter_unmanaged(link);
3383 return 0;
3384 } else if (r < 0)
3385 return r;
3386
3387 if (link->flags & IFF_LOOPBACK) {
3388 if (network->link_local != ADDRESS_FAMILY_NO)
3389 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3390
3391 if (network->dhcp != ADDRESS_FAMILY_NO)
3392 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3393
3394 if (network->dhcp_server)
3395 log_link_debug(link, "Ignoring DHCP server for loopback link");
3396 }
3397
3398 r = network_apply(network, link);
3399 if (r < 0)
3400 return r;
3401 }
3402
3403 r = link_new_bound_to_list(link);
3404 if (r < 0)
3405 return r;
3406
3407 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3408 * link_configure() is called later asynchronously. */
3409 r = link_configure_duid(link);
3410 if (r <= 0)
3411 return r;
3412
3413 r = link_configure(link);
3414 if (r < 0)
3415 return r;
3416
3417 return 0;
3418 }
3419
3420 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3421 (void) link_initialized_and_synced(link);
3422 return 1;
3423 }
3424
3425 int link_initialized(Link *link, sd_device *device) {
3426 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3427 int r;
3428
3429 assert(link);
3430 assert(link->manager);
3431 assert(link->manager->rtnl);
3432 assert(device);
3433
3434 if (link->state != LINK_STATE_PENDING)
3435 return 0;
3436
3437 if (link->sd_device)
3438 return 0;
3439
3440 log_link_debug(link, "udev initialized link");
3441 link_set_state(link, LINK_STATE_INITIALIZED);
3442
3443 link->sd_device = sd_device_ref(device);
3444
3445 /* udev has initialized the link, but we don't know if we have yet
3446 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3447 * when it returns we know that the pending NEWLINKs have already been
3448 * processed and that we are up-to-date */
3449
3450 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3451 link->ifindex);
3452 if (r < 0)
3453 return r;
3454
3455 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3456 link_netlink_destroy_callback, link);
3457 if (r < 0)
3458 return r;
3459
3460 link_ref(link);
3461
3462 return 0;
3463 }
3464
3465 static int link_load(Link *link) {
3466 _cleanup_free_ char *network_file = NULL,
3467 *addresses = NULL,
3468 *routes = NULL,
3469 *dhcp4_address = NULL,
3470 *ipv4ll_address = NULL;
3471 union in_addr_union address;
3472 union in_addr_union route_dst;
3473 const char *p;
3474 int r;
3475
3476 assert(link);
3477
3478 r = parse_env_file(NULL, link->state_file,
3479 "NETWORK_FILE", &network_file,
3480 "ADDRESSES", &addresses,
3481 "ROUTES", &routes,
3482 "DHCP4_ADDRESS", &dhcp4_address,
3483 "IPV4LL_ADDRESS", &ipv4ll_address);
3484 if (r < 0 && r != -ENOENT)
3485 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3486
3487 if (network_file) {
3488 Network *network;
3489 char *suffix;
3490
3491 /* drop suffix */
3492 suffix = strrchr(network_file, '.');
3493 if (!suffix) {
3494 log_link_debug(link, "Failed to get network name from %s", network_file);
3495 goto network_file_fail;
3496 }
3497 *suffix = '\0';
3498
3499 r = network_get_by_name(link->manager, basename(network_file), &network);
3500 if (r < 0) {
3501 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3502 goto network_file_fail;
3503 }
3504
3505 r = network_apply(network, link);
3506 if (r < 0)
3507 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3508 }
3509
3510 network_file_fail:
3511
3512 if (addresses) {
3513 p = addresses;
3514
3515 for (;;) {
3516 _cleanup_free_ char *address_str = NULL;
3517 char *prefixlen_str;
3518 int family;
3519 unsigned char prefixlen;
3520
3521 r = extract_first_word(&p, &address_str, NULL, 0);
3522 if (r < 0) {
3523 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3524 continue;
3525 }
3526 if (r == 0)
3527 break;
3528
3529 prefixlen_str = strchr(address_str, '/');
3530 if (!prefixlen_str) {
3531 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3532 continue;
3533 }
3534
3535 *prefixlen_str++ = '\0';
3536
3537 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3538 if (r != 1) {
3539 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3540 continue;
3541 }
3542
3543 r = in_addr_from_string_auto(address_str, &family, &address);
3544 if (r < 0) {
3545 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3546 continue;
3547 }
3548
3549 r = address_add(link, family, &address, prefixlen, NULL);
3550 if (r < 0)
3551 return log_link_error_errno(link, r, "Failed to add address: %m");
3552 }
3553 }
3554
3555 if (routes) {
3556 p = routes;
3557
3558 for (;;) {
3559 Route *route;
3560 _cleanup_free_ char *route_str = NULL;
3561 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3562 usec_t lifetime;
3563 char *prefixlen_str;
3564 int family;
3565 unsigned char prefixlen, tos, table;
3566 uint32_t priority;
3567
3568 r = extract_first_word(&p, &route_str, NULL, 0);
3569 if (r < 0) {
3570 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3571 continue;
3572 }
3573 if (r == 0)
3574 break;
3575
3576 prefixlen_str = strchr(route_str, '/');
3577 if (!prefixlen_str) {
3578 log_link_debug(link, "Failed to parse route %s", route_str);
3579 continue;
3580 }
3581
3582 *prefixlen_str++ = '\0';
3583
3584 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3585 if (r != 5) {
3586 log_link_debug(link,
3587 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3588 prefixlen_str);
3589 continue;
3590 }
3591
3592 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3593 if (r < 0) {
3594 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3595 continue;
3596 }
3597
3598 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3599 if (r < 0)
3600 return log_link_error_errno(link, r, "Failed to add route: %m");
3601
3602 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3603 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3604 0, route_expire_handler, route);
3605 if (r < 0)
3606 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3607 }
3608
3609 route->lifetime = lifetime;
3610 sd_event_source_unref(route->expire);
3611 route->expire = TAKE_PTR(expire);
3612 }
3613 }
3614
3615 if (dhcp4_address) {
3616 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3617 if (r < 0) {
3618 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3619 goto dhcp4_address_fail;
3620 }
3621
3622 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3623 if (r < 0)
3624 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3625
3626 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3627 if (r < 0)
3628 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3629 }
3630
3631 dhcp4_address_fail:
3632
3633 if (ipv4ll_address) {
3634 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3635 if (r < 0) {
3636 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3637 goto ipv4ll_address_fail;
3638 }
3639
3640 r = sd_ipv4ll_new(&link->ipv4ll);
3641 if (r < 0)
3642 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3643
3644 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3645 if (r < 0)
3646 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3647 }
3648
3649 ipv4ll_address_fail:
3650
3651 return 0;
3652 }
3653
3654 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3655 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3656 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3657 Link *link;
3658 int r;
3659
3660 assert(m);
3661 assert(m->rtnl);
3662 assert(message);
3663 assert(ret);
3664
3665 r = link_new(m, message, ret);
3666 if (r < 0)
3667 return r;
3668
3669 link = *ret;
3670
3671 log_link_debug(link, "Link %d added", link->ifindex);
3672
3673 r = link_load(link);
3674 if (r < 0)
3675 return r;
3676
3677 if (detect_container() <= 0) {
3678 /* not in a container, udev will be around */
3679 sprintf(ifindex_str, "n%d", link->ifindex);
3680 r = sd_device_new_from_device_id(&device, ifindex_str);
3681 if (r < 0) {
3682 log_link_warning_errno(link, r, "Could not find device: %m");
3683 goto failed;
3684 }
3685
3686 r = sd_device_get_is_initialized(device);
3687 if (r < 0) {
3688 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3689 goto failed;
3690 }
3691 if (r == 0) {
3692 /* not yet ready */
3693 log_link_debug(link, "link pending udev initialization...");
3694 return 0;
3695 }
3696
3697 r = device_is_renaming(device);
3698 if (r < 0) {
3699 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3700 goto failed;
3701 }
3702 if (r > 0) {
3703 log_link_debug(link, "Interface is under renaming, pending initialization.");
3704 return 0;
3705 }
3706
3707 r = link_initialized(link, device);
3708 if (r < 0)
3709 goto failed;
3710 } else {
3711 r = link_initialized_and_synced(link);
3712 if (r < 0)
3713 goto failed;
3714 }
3715
3716 return 0;
3717 failed:
3718 link_enter_failed(link);
3719 return r;
3720 }
3721
3722 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3723 int r;
3724
3725 assert(link);
3726
3727 log_link_info(link, "Gained IPv6LL");
3728
3729 link->ipv6ll_address = *address;
3730 link_check_ready(link);
3731
3732 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3733 r = link_acquire_ipv6_conf(link);
3734 if (r < 0) {
3735 link_enter_failed(link);
3736 return r;
3737 }
3738 }
3739
3740 return 0;
3741 }
3742
3743 static int link_carrier_gained(Link *link) {
3744 int r;
3745
3746 assert(link);
3747
3748 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3749 r = link_acquire_conf(link);
3750 if (r < 0) {
3751 link_enter_failed(link);
3752 return r;
3753 }
3754
3755 r = link_request_set_addresses(link);
3756 if (r < 0)
3757 return r;
3758 }
3759
3760 r = link_handle_bound_by_list(link);
3761 if (r < 0)
3762 return r;
3763
3764 return 0;
3765 }
3766
3767 static int link_carrier_lost(Link *link) {
3768 int r;
3769
3770 assert(link);
3771
3772 if (link->network && link->network->ignore_carrier_loss)
3773 return 0;
3774
3775 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3776 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3777 * configuration and stop the clients as well. */
3778 if (link->setting_mtu)
3779 return 0;
3780
3781 r = link_stop_clients(link);
3782 if (r < 0) {
3783 link_enter_failed(link);
3784 return r;
3785 }
3786
3787 if (link_dhcp4_server_enabled(link))
3788 (void) sd_dhcp_server_stop(link->dhcp_server);
3789
3790 r = link_drop_config(link);
3791 if (r < 0)
3792 return r;
3793
3794 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3795 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3796 r = link_drop_foreign_config(link);
3797 if (r < 0)
3798 return r;
3799 }
3800
3801 r = link_handle_bound_by_list(link);
3802 if (r < 0)
3803 return r;
3804
3805 return 0;
3806 }
3807
3808 int link_carrier_reset(Link *link) {
3809 int r;
3810
3811 assert(link);
3812
3813 if (link_has_carrier(link)) {
3814 r = link_carrier_lost(link);
3815 if (r < 0)
3816 return r;
3817
3818 r = link_carrier_gained(link);
3819 if (r < 0)
3820 return r;
3821
3822 log_link_info(link, "Reset carrier");
3823 }
3824
3825 return 0;
3826 }
3827
3828 int link_update(Link *link, sd_netlink_message *m) {
3829 struct ether_addr mac;
3830 const char *ifname;
3831 uint32_t mtu;
3832 bool had_carrier, carrier_gained, carrier_lost;
3833 int r;
3834
3835 assert(link);
3836 assert(link->ifname);
3837 assert(m);
3838
3839 if (link->state == LINK_STATE_LINGER) {
3840 log_link_info(link, "Link re-added");
3841 link_set_state(link, LINK_STATE_CONFIGURING);
3842
3843 r = link_new_carrier_maps(link);
3844 if (r < 0)
3845 return r;
3846 }
3847
3848 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3849 if (r >= 0 && !streq(ifname, link->ifname)) {
3850 Manager *manager = link->manager;
3851
3852 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3853
3854 link_drop(link);
3855 r = link_add(manager, m, &link);
3856 if (r < 0)
3857 return r;
3858 }
3859
3860 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3861 if (r >= 0 && mtu > 0) {
3862 link->mtu = mtu;
3863 if (link->original_mtu == 0) {
3864 link->original_mtu = mtu;
3865 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3866 }
3867
3868 if (link->dhcp_client) {
3869 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3870 link->mtu);
3871 if (r < 0)
3872 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3873 }
3874
3875 if (link->radv) {
3876 r = sd_radv_set_mtu(link->radv, link->mtu);
3877 if (r < 0)
3878 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3879 }
3880 }
3881
3882 /* The kernel may broadcast NEWLINK messages without the MAC address
3883 set, simply ignore them. */
3884 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3885 if (r >= 0) {
3886 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3887 ETH_ALEN)) {
3888
3889 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3890 ETH_ALEN);
3891
3892 log_link_debug(link, "MAC address: "
3893 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3894 mac.ether_addr_octet[0],
3895 mac.ether_addr_octet[1],
3896 mac.ether_addr_octet[2],
3897 mac.ether_addr_octet[3],
3898 mac.ether_addr_octet[4],
3899 mac.ether_addr_octet[5]);
3900
3901 if (link->ipv4ll) {
3902 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3903 if (r < 0)
3904 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3905 }
3906
3907 if (link->dhcp_client) {
3908 r = sd_dhcp_client_set_mac(link->dhcp_client,
3909 (const uint8_t *) &link->mac,
3910 sizeof (link->mac),
3911 ARPHRD_ETHER);
3912 if (r < 0)
3913 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3914
3915 r = dhcp4_set_client_identifier(link);
3916 if (r < 0)
3917 return r;
3918 }
3919
3920 if (link->dhcp6_client) {
3921 const DUID* duid = link_get_duid(link);
3922
3923 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3924 (const uint8_t *) &link->mac,
3925 sizeof (link->mac),
3926 ARPHRD_ETHER);
3927 if (r < 0)
3928 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3929
3930 if (link->network->iaid_set) {
3931 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3932 link->network->iaid);
3933 if (r < 0)
3934 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3935 }
3936
3937 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3938 duid->type,
3939 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3940 duid->raw_data_len);
3941 if (r < 0)
3942 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3943 }
3944
3945 if (link->radv) {
3946 r = sd_radv_set_mac(link->radv, &link->mac);
3947 if (r < 0)
3948 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3949 }
3950
3951 if (link->ndisc) {
3952 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3953 if (r < 0)
3954 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3955 }
3956 }
3957 }
3958
3959 had_carrier = link_has_carrier(link);
3960
3961 r = link_update_flags(link, m);
3962 if (r < 0)
3963 return r;
3964
3965 r = link_update_lldp(link);
3966 if (r < 0)
3967 return r;
3968
3969 carrier_gained = !had_carrier && link_has_carrier(link);
3970 carrier_lost = had_carrier && !link_has_carrier(link);
3971
3972 if (carrier_gained) {
3973 log_link_info(link, "Gained carrier");
3974
3975 r = link_carrier_gained(link);
3976 if (r < 0)
3977 return r;
3978 } else if (carrier_lost) {
3979 log_link_info(link, "Lost carrier");
3980
3981 r = link_carrier_lost(link);
3982 if (r < 0)
3983 return r;
3984 }
3985
3986 return 0;
3987 }
3988
3989 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3990 bool space = false;
3991 Iterator i;
3992 Link *link;
3993
3994 assert(f);
3995 assert(prefix);
3996
3997 if (hashmap_isempty(h))
3998 return;
3999
4000 fputs(prefix, f);
4001 HASHMAP_FOREACH(link, h, i) {
4002 if (space)
4003 fputc(' ', f);
4004
4005 fprintf(f, "%i", link->ifindex);
4006 space = true;
4007 }
4008
4009 fputc('\n', f);
4010 }
4011
4012 int link_save(Link *link) {
4013 _cleanup_free_ char *temp_path = NULL;
4014 _cleanup_fclose_ FILE *f = NULL;
4015 const char *admin_state, *oper_state;
4016 Address *a;
4017 Route *route;
4018 Iterator i;
4019 int r;
4020
4021 assert(link);
4022 assert(link->state_file);
4023 assert(link->lease_file);
4024 assert(link->manager);
4025
4026 if (link->state == LINK_STATE_LINGER) {
4027 (void) unlink(link->state_file);
4028 return 0;
4029 }
4030
4031 link_lldp_save(link);
4032
4033 admin_state = link_state_to_string(link->state);
4034 assert(admin_state);
4035
4036 oper_state = link_operstate_to_string(link->operstate);
4037 assert(oper_state);
4038
4039 r = fopen_temporary(link->state_file, &f, &temp_path);
4040 if (r < 0)
4041 goto fail;
4042
4043 (void) fchmod(fileno(f), 0644);
4044
4045 fprintf(f,
4046 "# This is private data. Do not parse.\n"
4047 "ADMIN_STATE=%s\n"
4048 "OPER_STATE=%s\n",
4049 admin_state, oper_state);
4050
4051 if (link->network) {
4052 bool space;
4053 sd_dhcp6_lease *dhcp6_lease = NULL;
4054 const char *dhcp_domainname = NULL;
4055 char **dhcp6_domains = NULL;
4056 char **dhcp_domains = NULL;
4057 unsigned j;
4058
4059 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4060 yes_no(link->network->required_for_online));
4061
4062 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
4063 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
4064
4065 if (link->dhcp6_client) {
4066 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
4067 if (r < 0 && r != -ENOMSG)
4068 log_link_debug(link, "No DHCPv6 lease");
4069 }
4070
4071 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4072
4073 fputs("DNS=", f);
4074 space = false;
4075
4076 for (j = 0; j < link->network->n_dns; j++) {
4077 _cleanup_free_ char *b = NULL;
4078
4079 r = in_addr_to_string(link->network->dns[j].family,
4080 &link->network->dns[j].address, &b);
4081 if (r < 0) {
4082 log_debug_errno(r, "Failed to format address, ignoring: %m");
4083 continue;
4084 }
4085
4086 if (space)
4087 fputc(' ', f);
4088 fputs(b, f);
4089 space = true;
4090 }
4091
4092 if (link->network->dhcp_use_dns &&
4093 link->dhcp_lease) {
4094 const struct in_addr *addresses;
4095
4096 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
4097 if (r > 0)
4098 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4099 space = true;
4100 }
4101
4102 if (link->network->dhcp_use_dns && dhcp6_lease) {
4103 struct in6_addr *in6_addrs;
4104
4105 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
4106 if (r > 0) {
4107 if (space)
4108 fputc(' ', f);
4109 serialize_in6_addrs(f, in6_addrs, r);
4110 space = true;
4111 }
4112 }
4113
4114 /* Make sure to flush out old entries before we use the NDISC data */
4115 ndisc_vacuum(link);
4116
4117 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4118 NDiscRDNSS *dd;
4119
4120 SET_FOREACH(dd, link->ndisc_rdnss, i) {
4121 if (space)
4122 fputc(' ', f);
4123
4124 serialize_in6_addrs(f, &dd->address, 1);
4125 space = true;
4126 }
4127 }
4128
4129 fputc('\n', f);
4130
4131 fputs("NTP=", f);
4132 space = false;
4133 fputstrv(f, link->network->ntp, NULL, &space);
4134
4135 if (link->network->dhcp_use_ntp &&
4136 link->dhcp_lease) {
4137 const struct in_addr *addresses;
4138
4139 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
4140 if (r > 0)
4141 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4142 space = true;
4143 }
4144
4145 if (link->network->dhcp_use_ntp && dhcp6_lease) {
4146 struct in6_addr *in6_addrs;
4147 char **hosts;
4148
4149 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
4150 &in6_addrs);
4151 if (r > 0) {
4152 if (space)
4153 fputc(' ', f);
4154 serialize_in6_addrs(f, in6_addrs, r);
4155 space = true;
4156 }
4157
4158 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
4159 if (r > 0)
4160 fputstrv(f, hosts, NULL, &space);
4161 }
4162
4163 fputc('\n', f);
4164
4165 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4166 if (link->dhcp_lease) {
4167 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4168 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4169 }
4170 if (dhcp6_lease)
4171 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4172 }
4173
4174 ordered_set_print(f, "DOMAINS=", link->network->search_domains);
4175
4176 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4177 NDiscDNSSL *dd;
4178
4179 if (dhcp_domainname)
4180 fputs_with_space(f, dhcp_domainname, NULL, &space);
4181 if (dhcp_domains)
4182 fputstrv(f, dhcp_domains, NULL, &space);
4183 if (dhcp6_domains)
4184 fputstrv(f, dhcp6_domains, NULL, &space);
4185
4186 SET_FOREACH(dd, link->ndisc_dnssl, i)
4187 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4188 }
4189
4190 fputc('\n', f);
4191
4192 ordered_set_print(f, "ROUTE_DOMAINS=", link->network->route_domains);
4193
4194 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4195 NDiscDNSSL *dd;
4196
4197 if (dhcp_domainname)
4198 fputs_with_space(f, dhcp_domainname, NULL, &space);
4199 if (dhcp_domains)
4200 fputstrv(f, dhcp_domains, NULL, &space);
4201 if (dhcp6_domains)
4202 fputstrv(f, dhcp6_domains, NULL, &space);
4203
4204 SET_FOREACH(dd, link->ndisc_dnssl, i)
4205 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4206 }
4207
4208 fputc('\n', f);
4209
4210 fprintf(f, "LLMNR=%s\n",
4211 resolve_support_to_string(link->network->llmnr));
4212 fprintf(f, "MDNS=%s\n",
4213 resolve_support_to_string(link->network->mdns));
4214 if (link->network->dns_default_route >= 0)
4215 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
4216
4217 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4218 fprintf(f, "DNS_OVER_TLS=%s\n",
4219 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
4220
4221 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
4222 fprintf(f, "DNSSEC=%s\n",
4223 dnssec_mode_to_string(link->network->dnssec_mode));
4224
4225 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
4226 const char *n;
4227
4228 fputs("DNSSEC_NTA=", f);
4229 space = false;
4230 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
4231 fputs_with_space(f, n, NULL, &space);
4232 fputc('\n', f);
4233 }
4234
4235 fputs("ADDRESSES=", f);
4236 space = false;
4237 SET_FOREACH(a, link->addresses, i) {
4238 _cleanup_free_ char *address_str = NULL;
4239
4240 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4241 if (r < 0)
4242 goto fail;
4243
4244 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4245 space = true;
4246 }
4247 fputc('\n', f);
4248
4249 fputs("ROUTES=", f);
4250 space = false;
4251 SET_FOREACH(route, link->routes, i) {
4252 _cleanup_free_ char *route_str = NULL;
4253
4254 r = in_addr_to_string(route->family, &route->dst, &route_str);
4255 if (r < 0)
4256 goto fail;
4257
4258 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4259 space ? " " : "", route_str,
4260 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4261 space = true;
4262 }
4263
4264 fputc('\n', f);
4265 }
4266
4267 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4268 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4269
4270 if (link->dhcp_lease) {
4271 struct in_addr address;
4272 const char *tz = NULL;
4273
4274 assert(link->network);
4275
4276 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
4277 if (r >= 0)
4278 fprintf(f, "TIMEZONE=%s\n", tz);
4279
4280 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
4281 if (r >= 0) {
4282 fputs("DHCP4_ADDRESS=", f);
4283 serialize_in_addrs(f, &address, 1, false, NULL);
4284 fputc('\n', f);
4285 }
4286
4287 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4288 if (r < 0)
4289 goto fail;
4290
4291 fprintf(f,
4292 "DHCP_LEASE=%s\n",
4293 link->lease_file);
4294 } else
4295 (void) unlink(link->lease_file);
4296
4297 if (link->ipv4ll) {
4298 struct in_addr address;
4299
4300 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4301 if (r >= 0) {
4302 fputs("IPV4LL_ADDRESS=", f);
4303 serialize_in_addrs(f, &address, 1, false, NULL);
4304 fputc('\n', f);
4305 }
4306 }
4307
4308 r = fflush_and_check(f);
4309 if (r < 0)
4310 goto fail;
4311
4312 if (rename(temp_path, link->state_file) < 0) {
4313 r = -errno;
4314 goto fail;
4315 }
4316
4317 return 0;
4318
4319 fail:
4320 (void) unlink(link->state_file);
4321 if (temp_path)
4322 (void) unlink(temp_path);
4323
4324 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4325 }
4326
4327 /* The serialized state in /run is no longer up-to-date. */
4328 void link_dirty(Link *link) {
4329 int r;
4330
4331 assert(link);
4332
4333 /* mark manager dirty as link is dirty */
4334 manager_dirty(link->manager);
4335
4336 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
4337 if (r < 0)
4338 /* allocation errors are ignored */
4339 return;
4340
4341 r = set_put(link->manager->dirty_links, link);
4342 if (r <= 0)
4343 /* don't take another ref if the link was already dirty */
4344 return;
4345
4346 link_ref(link);
4347 }
4348
4349 /* The serialized state in /run is up-to-date */
4350 void link_clean(Link *link) {
4351 assert(link);
4352 assert(link->manager);
4353
4354 link_unref(set_remove(link->manager->dirty_links, link));
4355 }
4356
4357 static const char* const link_state_table[_LINK_STATE_MAX] = {
4358 [LINK_STATE_PENDING] = "pending",
4359 [LINK_STATE_INITIALIZED] = "initialized",
4360 [LINK_STATE_CONFIGURING] = "configuring",
4361 [LINK_STATE_CONFIGURED] = "configured",
4362 [LINK_STATE_UNMANAGED] = "unmanaged",
4363 [LINK_STATE_FAILED] = "failed",
4364 [LINK_STATE_LINGER] = "linger",
4365 };
4366
4367 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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