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[thirdparty/systemd.git] / src / network / networkd-link.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <netinet/ether.h>
4 #include <linux/if.h>
5 #include <linux/can/netlink.h>
6 #include <unistd.h>
7
8 #include "alloc-util.h"
9 #include "bus-util.h"
10 #include "dhcp-identifier.h"
11 #include "dhcp-lease-internal.h"
12 #include "env-file.h"
13 #include "fd-util.h"
14 #include "fileio.h"
15 #include "missing_network.h"
16 #include "netdev/vrf.h"
17 #include "netlink-util.h"
18 #include "network-internal.h"
19 #include "networkd-ipv6-proxy-ndp.h"
20 #include "networkd-lldp-tx.h"
21 #include "networkd-manager.h"
22 #include "networkd-ndisc.h"
23 #include "networkd-neighbor.h"
24 #include "networkd-radv.h"
25 #include "networkd-routing-policy-rule.h"
26 #include "set.h"
27 #include "socket-util.h"
28 #include "stdio-util.h"
29 #include "string-table.h"
30 #include "strv.h"
31 #include "sysctl-util.h"
32 #include "tmpfile-util.h"
33 #include "udev-util.h"
34 #include "util.h"
35 #include "virt.h"
36
37 uint32_t link_get_vrf_table(Link *link) {
38 return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
39 }
40
41 uint32_t link_get_dhcp_route_table(Link *link) {
42 /* When the interface is part of an VRF use the VRFs routing table, unless
43 * another table is explicitly specified. */
44 if (link->network->dhcp_route_table_set)
45 return link->network->dhcp_route_table;
46 return link_get_vrf_table(link);
47 }
48
49 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
50 if (link->network->ipv6_accept_ra_route_table_set)
51 return link->network->ipv6_accept_ra_route_table;
52 return link_get_vrf_table(link);
53 }
54
55 DUID* link_get_duid(Link *link) {
56 if (link->network->duid.type != _DUID_TYPE_INVALID)
57 return &link->network->duid;
58 else
59 return &link->manager->duid;
60 }
61
62 static bool link_dhcp6_enabled(Link *link) {
63 assert(link);
64
65 if (!socket_ipv6_is_supported())
66 return false;
67
68 if (link->flags & IFF_LOOPBACK)
69 return false;
70
71 if (!link->network)
72 return false;
73
74 if (link->network->bond)
75 return false;
76
77 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
78 return false;
79
80 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
81 }
82
83 static bool link_dhcp4_enabled(Link *link) {
84 assert(link);
85
86 if (link->flags & IFF_LOOPBACK)
87 return false;
88
89 if (!link->network)
90 return false;
91
92 if (link->network->bond)
93 return false;
94
95 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
96 }
97
98 static bool link_dhcp4_server_enabled(Link *link) {
99 assert(link);
100
101 if (link->flags & IFF_LOOPBACK)
102 return false;
103
104 if (!link->network)
105 return false;
106
107 if (link->network->bond)
108 return false;
109
110 return link->network->dhcp_server;
111 }
112
113 bool link_ipv4ll_enabled(Link *link) {
114 assert(link);
115
116 if (link->flags & IFF_LOOPBACK)
117 return false;
118
119 if (!link->network)
120 return false;
121
122 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard"))
123 return false;
124
125 if (link->network->bond)
126 return false;
127
128 return link->network->link_local & ADDRESS_FAMILY_IPV4;
129 }
130
131 bool link_ipv4ll_fallback_enabled(Link *link) {
132 assert(link);
133
134 if (link->flags & IFF_LOOPBACK)
135 return false;
136
137 if (!link->network)
138 return false;
139
140 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard"))
141 return false;
142
143 if (link->network->bond)
144 return false;
145
146 return link->network->link_local & ADDRESS_FAMILY_FALLBACK_IPV4;
147 }
148
149 static bool link_ipv6ll_enabled(Link *link) {
150 assert(link);
151
152 if (!socket_ipv6_is_supported())
153 return false;
154
155 if (link->flags & IFF_LOOPBACK)
156 return false;
157
158 if (!link->network)
159 return false;
160
161 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard"))
162 return false;
163
164 if (link->network->bond)
165 return false;
166
167 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
168 return false;
169
170 return link->network->link_local & ADDRESS_FAMILY_IPV6;
171 }
172
173 static bool link_ipv6_enabled(Link *link) {
174 assert(link);
175
176 if (!socket_ipv6_is_supported())
177 return false;
178
179 if (link->network->bond)
180 return false;
181
182 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
183 return false;
184
185 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
186 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
187 }
188
189 static bool link_radv_enabled(Link *link) {
190 assert(link);
191
192 if (!link_ipv6ll_enabled(link))
193 return false;
194
195 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
196 }
197
198 static bool link_lldp_rx_enabled(Link *link) {
199 assert(link);
200
201 if (link->flags & IFF_LOOPBACK)
202 return false;
203
204 if (link->iftype != ARPHRD_ETHER)
205 return false;
206
207 if (!link->network)
208 return false;
209
210 /* LLDP should be handled on bridge slaves as those have a direct
211 * connection to their peers not on the bridge master. Linux doesn't
212 * even (by default) forward lldp packets to the bridge master.*/
213 if (streq_ptr("bridge", link->kind))
214 return false;
215
216 return link->network->lldp_mode != LLDP_MODE_NO;
217 }
218
219 static bool link_lldp_emit_enabled(Link *link) {
220 assert(link);
221
222 if (link->flags & IFF_LOOPBACK)
223 return false;
224
225 if (link->iftype != ARPHRD_ETHER)
226 return false;
227
228 if (!link->network)
229 return false;
230
231 return link->network->lldp_emit != LLDP_EMIT_NO;
232 }
233
234 static bool link_ipv4_forward_enabled(Link *link) {
235 assert(link);
236
237 if (link->flags & IFF_LOOPBACK)
238 return false;
239
240 if (!link->network)
241 return false;
242
243 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
244 return false;
245
246 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
247 }
248
249 static bool link_ipv6_forward_enabled(Link *link) {
250 assert(link);
251
252 if (!socket_ipv6_is_supported())
253 return false;
254
255 if (link->flags & IFF_LOOPBACK)
256 return false;
257
258 if (!link->network)
259 return false;
260
261 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
262 return false;
263
264 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
265 return false;
266
267 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
268 }
269
270 static bool link_proxy_arp_enabled(Link *link) {
271 assert(link);
272
273 if (link->flags & IFF_LOOPBACK)
274 return false;
275
276 if (!link->network)
277 return false;
278
279 if (link->network->proxy_arp < 0)
280 return false;
281
282 return true;
283 }
284
285 static bool link_ipv6_accept_ra_enabled(Link *link) {
286 assert(link);
287
288 if (!socket_ipv6_is_supported())
289 return false;
290
291 if (link->flags & IFF_LOOPBACK)
292 return false;
293
294 if (!link->network)
295 return false;
296
297 if (!link_ipv6ll_enabled(link))
298 return false;
299
300 /* If unset use system default (enabled if local forwarding is disabled.
301 * disabled if local forwarding is enabled).
302 * If set, ignore or enforce RA independent of local forwarding state.
303 */
304 if (link->network->ipv6_accept_ra < 0)
305 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
306 return !link_ipv6_forward_enabled(link);
307 else if (link->network->ipv6_accept_ra > 0)
308 /* accept RA even if ip_forward is enabled */
309 return true;
310 else
311 /* ignore RA */
312 return false;
313 }
314
315 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
316 assert(link);
317
318 if (!socket_ipv6_is_supported())
319 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
320
321 if (link->flags & IFF_LOOPBACK)
322 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
323
324 if (!link->network)
325 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
326
327 return link->network->ipv6_privacy_extensions;
328 }
329
330 static int link_enable_ipv6(Link *link) {
331 bool disabled;
332 int r;
333
334 if (link->flags & IFF_LOOPBACK)
335 return 0;
336
337 disabled = !link_ipv6_enabled(link);
338
339 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", disabled);
340 if (r < 0)
341 log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m",
342 enable_disable(!disabled), link->ifname);
343 else
344 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
345
346 return 0;
347 }
348
349 static bool link_is_enslaved(Link *link) {
350 if (link->flags & IFF_SLAVE)
351 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
352 return true;
353
354 if (!link->enslaved_raw)
355 return false;
356
357 if (!link->network)
358 return false;
359
360 if (link->network->bridge)
361 /* TODO: support the case when link is not managed by networkd. */
362 return true;
363
364 return false;
365 }
366
367 static void link_update_master_operstate(Link *link, NetDev *netdev) {
368 Link *master;
369
370 if (!netdev)
371 return;
372
373 if (link_get(link->manager, netdev->ifindex, &master) < 0)
374 return;
375
376 link_update_operstate(master, true);
377 }
378
379 void link_update_operstate(Link *link, bool also_update_master) {
380 LinkOperationalState operstate;
381 Iterator i;
382
383 assert(link);
384
385 if (link->kernel_operstate == IF_OPER_DORMANT)
386 operstate = LINK_OPERSTATE_DORMANT;
387 else if (link_has_carrier(link)) {
388 Address *address;
389 uint8_t scope = RT_SCOPE_NOWHERE;
390
391 /* if we have carrier, check what addresses we have */
392 SET_FOREACH(address, link->addresses, i) {
393 if (!address_is_ready(address))
394 continue;
395
396 if (address->scope < scope)
397 scope = address->scope;
398 }
399
400 /* for operstate we also take foreign addresses into account */
401 SET_FOREACH(address, link->addresses_foreign, i) {
402 if (!address_is_ready(address))
403 continue;
404
405 if (address->scope < scope)
406 scope = address->scope;
407 }
408
409 if (scope < RT_SCOPE_SITE)
410 /* universally accessible addresses found */
411 operstate = LINK_OPERSTATE_ROUTABLE;
412 else if (scope < RT_SCOPE_HOST)
413 /* only link or site local addresses found */
414 operstate = LINK_OPERSTATE_DEGRADED;
415 else
416 /* no useful addresses found */
417 operstate = LINK_OPERSTATE_CARRIER;
418 } else if (link->flags & IFF_UP)
419 operstate = LINK_OPERSTATE_NO_CARRIER;
420 else
421 operstate = LINK_OPERSTATE_OFF;
422
423 if (IN_SET(operstate, LINK_OPERSTATE_DEGRADED, LINK_OPERSTATE_CARRIER) &&
424 link_is_enslaved(link))
425 operstate = LINK_OPERSTATE_ENSLAVED;
426
427 if (operstate >= LINK_OPERSTATE_CARRIER) {
428 Link *slave;
429
430 SET_FOREACH(slave, link->slaves, i) {
431 link_update_operstate(slave, false);
432
433 if (slave->operstate < LINK_OPERSTATE_CARRIER)
434 operstate = LINK_OPERSTATE_DEGRADED_CARRIER;
435 }
436 }
437
438 if (link->operstate != operstate) {
439 link->operstate = operstate;
440 link_send_changed(link, "OperationalState", NULL);
441 link_dirty(link);
442 }
443
444 if (also_update_master && link->network) {
445 link_update_master_operstate(link, link->network->bond);
446 link_update_master_operstate(link, link->network->bridge);
447 }
448 }
449
450 #define FLAG_STRING(string, flag, old, new) \
451 (((old ^ new) & flag) \
452 ? ((old & flag) ? (" -" string) : (" +" string)) \
453 : "")
454
455 static int link_update_flags(Link *link, sd_netlink_message *m) {
456 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
457 uint8_t operstate;
458 int r;
459
460 assert(link);
461
462 r = sd_rtnl_message_link_get_flags(m, &flags);
463 if (r < 0)
464 return log_link_warning_errno(link, r, "Could not get link flags: %m");
465
466 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
467 if (r < 0)
468 /* if we got a message without operstate, take it to mean
469 the state was unchanged */
470 operstate = link->kernel_operstate;
471
472 if ((link->flags == flags) && (link->kernel_operstate == operstate))
473 return 0;
474
475 if (link->flags != flags) {
476 log_link_debug(link, "Flags change:%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
477 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
478 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
479 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
480 FLAG_STRING("UP", IFF_UP, link->flags, flags),
481 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
482 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
483 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
484 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
485 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
486 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
487 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
488 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
489 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
490 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
491 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
492 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
493 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
494 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
495 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
496
497 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
498 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
499 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
500 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
501 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
502 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
503 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
504 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
505
506 /* link flags are currently at most 18 bits, let's align to
507 * printing 20 */
508 if (unknown_flags_added)
509 log_link_debug(link,
510 "Unknown link flags gained: %#.5x (ignoring)",
511 unknown_flags_added);
512
513 if (unknown_flags_removed)
514 log_link_debug(link,
515 "Unknown link flags lost: %#.5x (ignoring)",
516 unknown_flags_removed);
517 }
518
519 link->flags = flags;
520 link->kernel_operstate = operstate;
521
522 link_update_operstate(link, true);
523
524 return 0;
525 }
526
527 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_unref);
528
529 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
530 _cleanup_(link_unrefp) Link *link = NULL;
531 uint16_t type;
532 const char *ifname, *kind = NULL;
533 int r, ifindex;
534 unsigned short iftype;
535
536 assert(manager);
537 assert(message);
538 assert(ret);
539
540 /* check for link kind */
541 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
542 if (r == 0) {
543 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
544 r = sd_netlink_message_exit_container(message);
545 if (r < 0)
546 return r;
547 }
548
549 r = sd_netlink_message_get_type(message, &type);
550 if (r < 0)
551 return r;
552 else if (type != RTM_NEWLINK)
553 return -EINVAL;
554
555 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
556 if (r < 0)
557 return r;
558 else if (ifindex <= 0)
559 return -EINVAL;
560
561 r = sd_rtnl_message_link_get_type(message, &iftype);
562 if (r < 0)
563 return r;
564
565 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
566 if (r < 0)
567 return r;
568
569 link = new(Link, 1);
570 if (!link)
571 return -ENOMEM;
572
573 *link = (Link) {
574 .n_ref = 1,
575 .manager = manager,
576 .state = LINK_STATE_PENDING,
577 .rtnl_extended_attrs = true,
578 .ifindex = ifindex,
579 .iftype = iftype,
580 };
581
582 link->ifname = strdup(ifname);
583 if (!link->ifname)
584 return -ENOMEM;
585
586 if (kind) {
587 link->kind = strdup(kind);
588 if (!link->kind)
589 return -ENOMEM;
590 }
591
592 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
593 if (r < 0)
594 log_link_debug_errno(link, r, "New device has no master, continuing without");
595
596 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
597 if (r < 0)
598 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
599
600 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
601 return -ENOMEM;
602
603 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
604 return -ENOMEM;
605
606 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
607 return -ENOMEM;
608
609 r = hashmap_ensure_allocated(&manager->links, NULL);
610 if (r < 0)
611 return r;
612
613 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
614 if (r < 0)
615 return r;
616
617 r = link_update_flags(link, message);
618 if (r < 0)
619 return r;
620
621 *ret = TAKE_PTR(link);
622
623 return 0;
624 }
625
626 static Link *link_free(Link *link) {
627 Address *address;
628
629 assert(link);
630
631 link->routes = set_free_with_destructor(link->routes, route_free);
632 link->routes_foreign = set_free_with_destructor(link->routes_foreign, route_free);
633
634 link->addresses = set_free_with_destructor(link->addresses, address_free);
635 link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free);
636
637 while ((address = link->pool_addresses)) {
638 LIST_REMOVE(addresses, link->pool_addresses, address);
639 address_free(address);
640 }
641
642 sd_dhcp_server_unref(link->dhcp_server);
643 sd_dhcp_client_unref(link->dhcp_client);
644 sd_dhcp_lease_unref(link->dhcp_lease);
645
646 link_lldp_emit_stop(link);
647
648 free(link->lease_file);
649
650 sd_lldp_unref(link->lldp);
651 free(link->lldp_file);
652
653 ndisc_flush(link);
654
655 sd_ipv4ll_unref(link->ipv4ll);
656 sd_dhcp6_client_unref(link->dhcp6_client);
657 sd_ndisc_unref(link->ndisc);
658 sd_radv_unref(link->radv);
659
660 free(link->ifname);
661 free(link->kind);
662
663 (void) unlink(link->state_file);
664 free(link->state_file);
665
666 sd_device_unref(link->sd_device);
667
668 hashmap_free(link->bound_to_links);
669 hashmap_free(link->bound_by_links);
670
671 set_free_with_destructor(link->slaves, link_unref);
672
673 network_unref(link->network);
674
675 return mfree(link);
676 }
677
678 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
679
680 int link_get(Manager *m, int ifindex, Link **ret) {
681 Link *link;
682
683 assert(m);
684 assert(ifindex);
685 assert(ret);
686
687 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
688 if (!link)
689 return -ENODEV;
690
691 *ret = link;
692
693 return 0;
694 }
695
696 static void link_set_state(Link *link, LinkState state) {
697 assert(link);
698
699 if (link->state == state)
700 return;
701
702 log_link_debug(link, "State changed: %s -> %s",
703 link_state_to_string(link->state),
704 link_state_to_string(state));
705
706 link->state = state;
707
708 link_send_changed(link, "AdministrativeState", NULL);
709 }
710
711 static void link_enter_unmanaged(Link *link) {
712 assert(link);
713
714 log_link_debug(link, "Unmanaged");
715
716 link_set_state(link, LINK_STATE_UNMANAGED);
717
718 link_dirty(link);
719 }
720
721 int link_stop_clients(Link *link) {
722 int r = 0, k;
723
724 assert(link);
725 assert(link->manager);
726 assert(link->manager->event);
727
728 if (link->dhcp_client) {
729 k = sd_dhcp_client_stop(link->dhcp_client);
730 if (k < 0)
731 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
732 }
733
734 if (link->ipv4ll) {
735 k = sd_ipv4ll_stop(link->ipv4ll);
736 if (k < 0)
737 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
738 }
739
740 if (link->dhcp6_client) {
741 k = sd_dhcp6_client_stop(link->dhcp6_client);
742 if (k < 0)
743 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
744 }
745
746 if (link->ndisc) {
747 k = sd_ndisc_stop(link->ndisc);
748 if (k < 0)
749 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
750 }
751
752 if (link->radv) {
753 k = sd_radv_stop(link->radv);
754 if (k < 0)
755 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
756 }
757
758 link_lldp_emit_stop(link);
759 return r;
760 }
761
762 void link_enter_failed(Link *link) {
763 assert(link);
764
765 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
766 return;
767
768 log_link_warning(link, "Failed");
769
770 link_set_state(link, LINK_STATE_FAILED);
771
772 link_stop_clients(link);
773
774 link_dirty(link);
775 }
776
777 static Address* link_find_dhcp_server_address(Link *link) {
778 Address *address;
779
780 assert(link);
781 assert(link->network);
782
783 /* The first statically configured address if there is any */
784 LIST_FOREACH(addresses, address, link->network->static_addresses) {
785
786 if (address->family != AF_INET)
787 continue;
788
789 if (in_addr_is_null(address->family, &address->in_addr))
790 continue;
791
792 return address;
793 }
794
795 /* If that didn't work, find a suitable address we got from the pool */
796 LIST_FOREACH(addresses, address, link->pool_addresses) {
797 if (address->family != AF_INET)
798 continue;
799
800 return address;
801 }
802
803 return NULL;
804 }
805
806 static int link_join_netdevs_after_configured(Link *link) {
807 NetDev *netdev;
808 Iterator i;
809 int r;
810
811 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
812 if (netdev->ifindex > 0)
813 /* Assume already enslaved. */
814 continue;
815
816 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
817 continue;
818
819 log_struct(LOG_DEBUG,
820 LOG_LINK_INTERFACE(link),
821 LOG_NETDEV_INTERFACE(netdev),
822 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
823
824 r = netdev_join(netdev, link, NULL);
825 if (r < 0)
826 return log_struct_errno(LOG_WARNING, r,
827 LOG_LINK_INTERFACE(link),
828 LOG_NETDEV_INTERFACE(netdev),
829 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
830 }
831
832 return 0;
833 }
834
835 static void link_enter_configured(Link *link) {
836 assert(link);
837 assert(link->network);
838
839 if (link->state != LINK_STATE_CONFIGURING)
840 return;
841
842 log_link_info(link, "Configured");
843
844 link_set_state(link, LINK_STATE_CONFIGURED);
845
846 (void) link_join_netdevs_after_configured(link);
847
848 link_dirty(link);
849 }
850
851 static int link_request_set_routing_policy_rule(Link *link) {
852 RoutingPolicyRule *rule, *rrule = NULL;
853 int r;
854
855 assert(link);
856 assert(link->network);
857
858 link_set_state(link, LINK_STATE_CONFIGURING);
859 link->routing_policy_rules_configured = false;
860
861 LIST_FOREACH(rules, rule, link->network->rules) {
862 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
863 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif,
864 rule->protocol, &rule->sport, &rule->dport, &rrule);
865 if (r == 0) {
866 (void) routing_policy_rule_make_local(link->manager, rrule);
867 continue;
868 }
869
870 r = routing_policy_rule_configure(rule, link, NULL, false);
871 if (r < 0) {
872 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
873 link_enter_failed(link);
874 return r;
875 }
876
877 link->routing_policy_rule_messages++;
878 }
879
880 routing_policy_rule_purge(link->manager, link);
881 if (link->routing_policy_rule_messages == 0) {
882 link->routing_policy_rules_configured = true;
883 link_check_ready(link);
884 } else
885 log_link_debug(link, "Setting routing policy rules");
886
887 return 0;
888 }
889
890 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
891 int r;
892
893 assert(link);
894 assert(link->route_messages > 0);
895 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
896 LINK_STATE_FAILED, LINK_STATE_LINGER));
897
898 link->route_messages--;
899
900 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
901 return 1;
902
903 r = sd_netlink_message_get_errno(m);
904 if (r < 0 && r != -EEXIST)
905 log_link_warning_errno(link, r, "Could not set route: %m");
906
907 if (link->route_messages == 0) {
908 log_link_debug(link, "Routes set");
909 link->static_routes_configured = true;
910 link_check_ready(link);
911 }
912
913 return 1;
914 }
915
916 int link_request_set_routes(Link *link) {
917 enum {
918 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
919 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
920 _PHASE_MAX
921 } phase;
922 Route *rt;
923 int r;
924
925 assert(link);
926 assert(link->network);
927 assert(link->addresses_configured);
928 assert(link->address_messages == 0);
929 assert(link->state != _LINK_STATE_INVALID);
930
931 link_set_state(link, LINK_STATE_CONFIGURING);
932 link->static_routes_configured = false;
933
934 r = link_request_set_routing_policy_rule(link);
935 if (r < 0)
936 return r;
937
938 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
939 for (phase = 0; phase < _PHASE_MAX; phase++)
940 LIST_FOREACH(routes, rt, link->network->static_routes) {
941
942 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
943 continue;
944
945 r = route_configure(rt, link, route_handler);
946 if (r < 0) {
947 log_link_warning_errno(link, r, "Could not set routes: %m");
948 link_enter_failed(link);
949 return r;
950 }
951
952 link->route_messages++;
953 }
954
955 if (link->route_messages == 0) {
956 link->static_routes_configured = true;
957 link_check_ready(link);
958 } else
959 log_link_debug(link, "Setting routes");
960
961 return 0;
962 }
963
964 void link_check_ready(Link *link) {
965 Address *a;
966 Iterator i;
967
968 assert(link);
969
970 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
971 return;
972
973 if (!link->network)
974 return;
975
976 if (!link->addresses_configured)
977 return;
978
979 if (!link->neighbors_configured)
980 return;
981
982 SET_FOREACH(a, link->addresses, i)
983 if (!address_is_ready(a))
984 return;
985
986 if (!link->addresses_ready) {
987 link->addresses_ready = true;
988 link_request_set_routes(link);
989 }
990
991 if (!link->static_routes_configured)
992 return;
993
994 if (!link->routing_policy_rules_configured)
995 return;
996
997 if (link_ipv4ll_enabled(link) && !(link->ipv4ll_address && link->ipv4ll_route))
998 return;
999
1000 if (link_ipv6ll_enabled(link) &&
1001 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
1002 return;
1003
1004 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
1005 !(link->dhcp4_configured || link->dhcp6_configured) &&
1006 !(link_ipv4ll_fallback_enabled(link) && link->ipv4ll_address && link->ipv4ll_route))
1007 /* When DHCP is enabled, at least one protocol must provide an address, or
1008 * an IPv4ll fallback address must be configured. */
1009 return;
1010
1011 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
1012 return;
1013
1014 if (link->state != LINK_STATE_CONFIGURED)
1015 link_enter_configured(link);
1016
1017 return;
1018 }
1019
1020 static int link_request_set_neighbors(Link *link) {
1021 Neighbor *neighbor;
1022 int r;
1023
1024 assert(link);
1025 assert(link->network);
1026 assert(link->state != _LINK_STATE_INVALID);
1027
1028 link_set_state(link, LINK_STATE_CONFIGURING);
1029 link->neighbors_configured = false;
1030
1031 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1032 r = neighbor_configure(neighbor, link, NULL);
1033 if (r < 0) {
1034 log_link_warning_errno(link, r, "Could not set neighbor: %m");
1035 link_enter_failed(link);
1036 return r;
1037 }
1038 }
1039
1040 if (link->neighbor_messages == 0) {
1041 link->neighbors_configured = true;
1042 link_check_ready(link);
1043 } else
1044 log_link_debug(link, "Setting neighbors");
1045
1046 return 0;
1047 }
1048
1049 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1050 int r;
1051
1052 assert(rtnl);
1053 assert(m);
1054 assert(link);
1055 assert(link->ifname);
1056 assert(link->address_messages > 0);
1057 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1058 LINK_STATE_FAILED, LINK_STATE_LINGER));
1059
1060 link->address_messages--;
1061
1062 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1063 return 1;
1064
1065 r = sd_netlink_message_get_errno(m);
1066 if (r < 0 && r != -EEXIST)
1067 log_link_warning_errno(link, r, "could not set address: %m");
1068 else if (r >= 0)
1069 manager_rtnl_process_address(rtnl, m, link->manager);
1070
1071 if (link->address_messages == 0) {
1072 log_link_debug(link, "Addresses set");
1073 link->addresses_configured = true;
1074 link_check_ready(link);
1075 }
1076
1077 return 1;
1078 }
1079
1080 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1081 _cleanup_free_ struct in_addr *addresses = NULL;
1082 size_t n_addresses = 0, n_allocated = 0;
1083 unsigned i;
1084
1085 log_debug("Copying DNS server information from %s", link->ifname);
1086
1087 if (!link->network)
1088 return 0;
1089
1090 for (i = 0; i < link->network->n_dns; i++) {
1091 struct in_addr ia;
1092
1093 /* Only look for IPv4 addresses */
1094 if (link->network->dns[i].family != AF_INET)
1095 continue;
1096
1097 ia = link->network->dns[i].address.in;
1098
1099 /* Never propagate obviously borked data */
1100 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1101 continue;
1102
1103 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1104 return log_oom();
1105
1106 addresses[n_addresses++] = ia;
1107 }
1108
1109 if (link->network->dhcp_use_dns && link->dhcp_lease) {
1110 const struct in_addr *da = NULL;
1111 int j, n;
1112
1113 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
1114 if (n > 0) {
1115
1116 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1117 return log_oom();
1118
1119 for (j = 0; j < n; j++)
1120 if (in4_addr_is_non_local(&da[j]))
1121 addresses[n_addresses++] = da[j];
1122 }
1123 }
1124
1125 if (n_addresses <= 0)
1126 return 0;
1127
1128 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
1129 }
1130
1131 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1132 _cleanup_free_ struct in_addr *addresses = NULL;
1133 size_t n_addresses = 0, n_allocated = 0;
1134 char **a;
1135
1136 if (!link->network)
1137 return 0;
1138
1139 log_debug("Copying NTP server information from %s", link->ifname);
1140
1141 STRV_FOREACH(a, link->network->ntp) {
1142 struct in_addr ia;
1143
1144 /* Only look for IPv4 addresses */
1145 if (inet_pton(AF_INET, *a, &ia) <= 0)
1146 continue;
1147
1148 /* Never propagate obviously borked data */
1149 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1150 continue;
1151
1152 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1153 return log_oom();
1154
1155 addresses[n_addresses++] = ia;
1156 }
1157
1158 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1159 const struct in_addr *da = NULL;
1160 int j, n;
1161
1162 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1163 if (n > 0) {
1164
1165 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1166 return log_oom();
1167
1168 for (j = 0; j < n; j++)
1169 if (in4_addr_is_non_local(&da[j]))
1170 addresses[n_addresses++] = da[j];
1171 }
1172 }
1173
1174 if (n_addresses <= 0)
1175 return 0;
1176
1177 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1178 }
1179
1180 static int link_set_bridge_fdb(Link *link) {
1181 FdbEntry *fdb_entry;
1182 int r;
1183
1184 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1185 r = fdb_entry_configure(link, fdb_entry);
1186 if (r < 0)
1187 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1188 }
1189
1190 return 0;
1191 }
1192
1193 static int link_request_set_addresses(Link *link) {
1194 AddressLabel *label;
1195 Address *ad;
1196 int r;
1197
1198 assert(link);
1199 assert(link->network);
1200 assert(link->state != _LINK_STATE_INVALID);
1201
1202 link_set_state(link, LINK_STATE_CONFIGURING);
1203
1204 /* Reset all *_configured flags we are configuring. */
1205 link->addresses_configured = false;
1206 link->addresses_ready = false;
1207 link->neighbors_configured = false;
1208 link->static_routes_configured = false;
1209 link->routing_policy_rules_configured = false;
1210
1211 r = link_set_bridge_fdb(link);
1212 if (r < 0)
1213 return r;
1214
1215 r = link_request_set_neighbors(link);
1216 if (r < 0)
1217 return r;
1218
1219 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1220 bool update;
1221
1222 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1223
1224 r = address_configure(ad, link, address_handler, update);
1225 if (r < 0) {
1226 log_link_warning_errno(link, r, "Could not set addresses: %m");
1227 link_enter_failed(link);
1228 return r;
1229 }
1230
1231 link->address_messages++;
1232 }
1233
1234 LIST_FOREACH(labels, label, link->network->address_labels) {
1235 r = address_label_configure(label, link, NULL, false);
1236 if (r < 0) {
1237 log_link_warning_errno(link, r, "Could not set address label: %m");
1238 link_enter_failed(link);
1239 return r;
1240 }
1241
1242 link->address_label_messages++;
1243 }
1244
1245 /* now that we can figure out a default address for the dhcp server,
1246 start it */
1247 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1248 Address *address;
1249 Link *uplink = NULL;
1250 bool acquired_uplink = false;
1251
1252 address = link_find_dhcp_server_address(link);
1253 if (!address) {
1254 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1255 link_enter_failed(link);
1256 return 0;
1257 }
1258
1259 /* use the server address' subnet as the pool */
1260 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1261 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1262 if (r < 0)
1263 return r;
1264
1265 /* TODO:
1266 r = sd_dhcp_server_set_router(link->dhcp_server,
1267 &main_address->in_addr.in);
1268 if (r < 0)
1269 return r;
1270 */
1271
1272 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1273 r = sd_dhcp_server_set_max_lease_time(
1274 link->dhcp_server,
1275 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1276 if (r < 0)
1277 return r;
1278 }
1279
1280 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1281 r = sd_dhcp_server_set_default_lease_time(
1282 link->dhcp_server,
1283 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1284 if (r < 0)
1285 return r;
1286 }
1287
1288 if (link->network->dhcp_server_emit_dns) {
1289
1290 if (link->network->n_dhcp_server_dns > 0)
1291 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1292 else {
1293 uplink = manager_find_uplink(link->manager, link);
1294 acquired_uplink = true;
1295
1296 if (!uplink) {
1297 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1298 r = 0;
1299 } else
1300 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1301 }
1302 if (r < 0)
1303 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1304 }
1305
1306 if (link->network->dhcp_server_emit_ntp) {
1307
1308 if (link->network->n_dhcp_server_ntp > 0)
1309 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1310 else {
1311 if (!acquired_uplink)
1312 uplink = manager_find_uplink(link->manager, link);
1313
1314 if (!uplink) {
1315 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1316 r = 0;
1317 } else
1318 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1319
1320 }
1321 if (r < 0)
1322 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1323 }
1324
1325 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1326 if (r < 0)
1327 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1328
1329 if (link->network->dhcp_server_emit_timezone) {
1330 _cleanup_free_ char *buffer = NULL;
1331 const char *tz = NULL;
1332
1333 if (link->network->dhcp_server_timezone)
1334 tz = link->network->dhcp_server_timezone;
1335 else {
1336 r = get_timezone(&buffer);
1337 if (r < 0)
1338 log_warning_errno(r, "Failed to determine timezone: %m");
1339 else
1340 tz = buffer;
1341 }
1342
1343 if (tz) {
1344 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1345 if (r < 0)
1346 return r;
1347 }
1348 }
1349 if (!sd_dhcp_server_is_running(link->dhcp_server)) {
1350 r = sd_dhcp_server_start(link->dhcp_server);
1351 if (r < 0) {
1352 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1353
1354 link_enter_failed(link);
1355
1356 return 0;
1357 }
1358 }
1359
1360 log_link_debug(link, "Offering DHCPv4 leases");
1361 }
1362
1363 if (link->address_messages == 0) {
1364 link->addresses_configured = true;
1365 link_check_ready(link);
1366 } else
1367 log_link_debug(link, "Setting addresses");
1368
1369 return 0;
1370 }
1371
1372 static int link_set_bridge_vlan(Link *link) {
1373 int r = 0;
1374
1375 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1376 if (r < 0)
1377 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1378
1379 return r;
1380 }
1381
1382 static int link_set_proxy_arp(Link *link) {
1383 int r;
1384
1385 if (!link_proxy_arp_enabled(link))
1386 return 0;
1387
1388 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1389 if (r < 0)
1390 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1391
1392 return 0;
1393 }
1394
1395 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1396 int r;
1397
1398 assert(link);
1399
1400 log_link_debug(link, "Set link");
1401
1402 r = sd_netlink_message_get_errno(m);
1403 if (r < 0 && r != -EEXIST) {
1404 log_link_error_errno(link, r, "Could not join netdev: %m");
1405 link_enter_failed(link);
1406 }
1407
1408 return 1;
1409 }
1410
1411 static int link_configure_after_setting_mtu(Link *link);
1412
1413 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1414 int r;
1415
1416 assert(m);
1417 assert(link);
1418 assert(link->ifname);
1419
1420 link->setting_mtu = false;
1421
1422 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1423 return 1;
1424
1425 r = sd_netlink_message_get_errno(m);
1426 if (r < 0) {
1427 log_link_warning_errno(link, r, "Could not set MTU: %m");
1428 return 1;
1429 }
1430
1431 log_link_debug(link, "Setting MTU done.");
1432
1433 if (link->state == LINK_STATE_INITIALIZED)
1434 (void) link_configure_after_setting_mtu(link);
1435
1436 return 1;
1437 }
1438
1439 int link_set_mtu(Link *link, uint32_t mtu, bool force) {
1440 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1441 int r;
1442
1443 assert(link);
1444 assert(link->manager);
1445 assert(link->manager->rtnl);
1446
1447 if (mtu == 0 || link->setting_mtu)
1448 return 0;
1449
1450 if (force ? link->mtu == mtu : link->mtu >= mtu)
1451 return 0;
1452
1453 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1454
1455 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1456 if (r < 0)
1457 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1458
1459 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1460 * for this interface, then disable IPv6 else enable it. */
1461 (void) link_enable_ipv6(link);
1462
1463 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1464 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1465 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1466
1467 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1468 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1469
1470 mtu = IPV6_MIN_MTU;
1471 }
1472
1473 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1474 if (r < 0)
1475 return log_link_error_errno(link, r, "Could not append MTU: %m");
1476
1477 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1478 link_netlink_destroy_callback, link);
1479 if (r < 0)
1480 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1481
1482 link_ref(link);
1483 link->setting_mtu = true;
1484
1485 return 0;
1486 }
1487
1488 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1489 int r;
1490
1491 assert(m);
1492 assert(link);
1493 assert(link->ifname);
1494
1495 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1496 return 1;
1497
1498 r = sd_netlink_message_get_errno(m);
1499 if (r < 0)
1500 log_link_warning_errno(link, r, "Could not set link flags: %m");
1501
1502 return 1;
1503 }
1504
1505 static int link_set_flags(Link *link) {
1506 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1507 unsigned ifi_change = 0;
1508 unsigned ifi_flags = 0;
1509 int r;
1510
1511 assert(link);
1512 assert(link->manager);
1513 assert(link->manager->rtnl);
1514
1515 if (link->flags & IFF_LOOPBACK)
1516 return 0;
1517
1518 if (!link->network)
1519 return 0;
1520
1521 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1522 return 0;
1523
1524 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1525 if (r < 0)
1526 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1527
1528 if (link->network->arp >= 0) {
1529 ifi_change |= IFF_NOARP;
1530 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1531 }
1532
1533 if (link->network->multicast >= 0) {
1534 ifi_change |= IFF_MULTICAST;
1535 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1536 }
1537
1538 if (link->network->allmulticast >= 0) {
1539 ifi_change |= IFF_ALLMULTI;
1540 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1541 }
1542
1543 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1544 if (r < 0)
1545 return log_link_error_errno(link, r, "Could not set link flags: %m");
1546
1547 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1548 link_netlink_destroy_callback, link);
1549 if (r < 0)
1550 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1551
1552 link_ref(link);
1553
1554 return 0;
1555 }
1556
1557 static int link_set_bridge(Link *link) {
1558 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1559 int r;
1560
1561 assert(link);
1562 assert(link->network);
1563
1564 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1565 if (r < 0)
1566 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1567
1568 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1569 if (r < 0)
1570 return log_link_error_errno(link, r, "Could not set message family: %m");
1571
1572 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1573 if (r < 0)
1574 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1575
1576 if (link->network->use_bpdu >= 0) {
1577 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
1578 if (r < 0)
1579 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1580 }
1581
1582 if (link->network->hairpin >= 0) {
1583 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1584 if (r < 0)
1585 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1586 }
1587
1588 if (link->network->fast_leave >= 0) {
1589 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1590 if (r < 0)
1591 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1592 }
1593
1594 if (link->network->allow_port_to_be_root >= 0) {
1595 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
1596 if (r < 0)
1597 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1598
1599 }
1600
1601 if (link->network->unicast_flood >= 0) {
1602 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1603 if (r < 0)
1604 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1605 }
1606
1607 if (link->network->multicast_flood >= 0) {
1608 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_FLOOD, link->network->multicast_flood);
1609 if (r < 0)
1610 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_FLOOD attribute: %m");
1611 }
1612
1613 if (link->network->multicast_to_unicast >= 0) {
1614 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_TO_UCAST, link->network->multicast_to_unicast);
1615 if (r < 0)
1616 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_TO_UCAST attribute: %m");
1617 }
1618
1619 if (link->network->neighbor_suppression >= 0) {
1620 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_NEIGH_SUPPRESS, link->network->neighbor_suppression);
1621 if (r < 0)
1622 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_NEIGH_SUPPRESS attribute: %m");
1623 }
1624
1625 if (link->network->learning >= 0) {
1626 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_LEARNING, link->network->learning);
1627 if (r < 0)
1628 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_LEARNING attribute: %m");
1629 }
1630
1631 if (link->network->cost != 0) {
1632 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1633 if (r < 0)
1634 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1635 }
1636
1637 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1638 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1639 if (r < 0)
1640 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1641 }
1642
1643 r = sd_netlink_message_close_container(req);
1644 if (r < 0)
1645 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1646
1647 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_handler,
1648 link_netlink_destroy_callback, link);
1649 if (r < 0)
1650 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1651
1652 link_ref(link);
1653
1654 return r;
1655 }
1656
1657 static int link_set_bond_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1658 int r;
1659
1660 assert(m);
1661 assert(link);
1662 assert(link->ifname);
1663
1664 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1665 return 1;
1666
1667 r = sd_netlink_message_get_errno(m);
1668 if (r < 0) {
1669 log_link_warning_errno(link, r, "Could not set bonding interface: %m");
1670 return 1;
1671 }
1672
1673 return 1;
1674 }
1675
1676 static int link_set_bond(Link *link) {
1677 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1678 int r;
1679
1680 assert(link);
1681 assert(link->network);
1682
1683 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1684 if (r < 0)
1685 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1686
1687 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1688 if (r < 0)
1689 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1690
1691 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1692 if (r < 0)
1693 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1694
1695 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1696 if (r < 0)
1697 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1698
1699 if (link->network->active_slave) {
1700 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1701 if (r < 0)
1702 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1703 }
1704
1705 if (link->network->primary_slave) {
1706 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1707 if (r < 0)
1708 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1709 }
1710
1711 r = sd_netlink_message_close_container(req);
1712 if (r < 0)
1713 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1714
1715 r = sd_netlink_message_close_container(req);
1716 if (r < 0)
1717 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1718
1719 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_bond_handler,
1720 link_netlink_destroy_callback, link);
1721 if (r < 0)
1722 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1723
1724 link_ref(link);
1725
1726 return r;
1727 }
1728
1729 static int link_lldp_save(Link *link) {
1730 _cleanup_free_ char *temp_path = NULL;
1731 _cleanup_fclose_ FILE *f = NULL;
1732 sd_lldp_neighbor **l = NULL;
1733 int n = 0, r, i;
1734
1735 assert(link);
1736 assert(link->lldp_file);
1737
1738 if (!link->lldp) {
1739 (void) unlink(link->lldp_file);
1740 return 0;
1741 }
1742
1743 r = sd_lldp_get_neighbors(link->lldp, &l);
1744 if (r < 0)
1745 goto finish;
1746 if (r == 0) {
1747 (void) unlink(link->lldp_file);
1748 goto finish;
1749 }
1750
1751 n = r;
1752
1753 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1754 if (r < 0)
1755 goto finish;
1756
1757 fchmod(fileno(f), 0644);
1758
1759 for (i = 0; i < n; i++) {
1760 const void *p;
1761 le64_t u;
1762 size_t sz;
1763
1764 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1765 if (r < 0)
1766 goto finish;
1767
1768 u = htole64(sz);
1769 (void) fwrite(&u, 1, sizeof(u), f);
1770 (void) fwrite(p, 1, sz, f);
1771 }
1772
1773 r = fflush_and_check(f);
1774 if (r < 0)
1775 goto finish;
1776
1777 if (rename(temp_path, link->lldp_file) < 0) {
1778 r = -errno;
1779 goto finish;
1780 }
1781
1782 finish:
1783 if (r < 0) {
1784 (void) unlink(link->lldp_file);
1785 if (temp_path)
1786 (void) unlink(temp_path);
1787
1788 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1789 }
1790
1791 if (l) {
1792 for (i = 0; i < n; i++)
1793 sd_lldp_neighbor_unref(l[i]);
1794 free(l);
1795 }
1796
1797 return r;
1798 }
1799
1800 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1801 Link *link = userdata;
1802 int r;
1803
1804 assert(link);
1805
1806 (void) link_lldp_save(link);
1807
1808 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1809 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1810
1811 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1812
1813 r = link_lldp_emit_start(link);
1814 if (r < 0)
1815 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1816 }
1817 }
1818
1819 static int link_acquire_ipv6_conf(Link *link) {
1820 int r;
1821
1822 assert(link);
1823
1824 if (link_ipv6_accept_ra_enabled(link)) {
1825 assert(link->ndisc);
1826
1827 log_link_debug(link, "Discovering IPv6 routers");
1828
1829 r = sd_ndisc_start(link->ndisc);
1830 if (r < 0 && r != -EBUSY)
1831 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1832 }
1833
1834 if (link_radv_enabled(link)) {
1835 assert(link->radv);
1836 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1837
1838 log_link_debug(link, "Starting IPv6 Router Advertisements");
1839
1840 r = sd_radv_start(link->radv);
1841 if (r < 0 && r != -EBUSY)
1842 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1843 }
1844
1845 (void) dhcp6_request_prefix_delegation(link);
1846
1847 return 0;
1848 }
1849
1850 static int link_acquire_ipv4_conf(Link *link) {
1851 int r;
1852
1853 assert(link);
1854 assert(link->manager);
1855 assert(link->manager->event);
1856
1857 if (link_ipv4ll_enabled(link)) {
1858 assert(link->ipv4ll);
1859
1860 log_link_debug(link, "Acquiring IPv4 link-local address");
1861
1862 r = sd_ipv4ll_start(link->ipv4ll);
1863 if (r < 0)
1864 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1865 }
1866
1867 if (link_dhcp4_enabled(link)) {
1868 assert(link->dhcp_client);
1869
1870 log_link_debug(link, "Acquiring DHCPv4 lease");
1871
1872 r = sd_dhcp_client_start(link->dhcp_client);
1873 if (r < 0)
1874 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1875 }
1876
1877 return 0;
1878 }
1879
1880 static int link_acquire_conf(Link *link) {
1881 int r;
1882
1883 assert(link);
1884
1885 r = link_acquire_ipv4_conf(link);
1886 if (r < 0)
1887 return r;
1888
1889 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1890 r = link_acquire_ipv6_conf(link);
1891 if (r < 0)
1892 return r;
1893 }
1894
1895 if (link_lldp_emit_enabled(link)) {
1896 r = link_lldp_emit_start(link);
1897 if (r < 0)
1898 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1899 }
1900
1901 return 0;
1902 }
1903
1904 bool link_has_carrier(Link *link) {
1905 /* see Documentation/networking/operstates.txt in the kernel sources */
1906
1907 if (link->kernel_operstate == IF_OPER_UP)
1908 return true;
1909
1910 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1911 /* operstate may not be implemented, so fall back to flags */
1912 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1913 return true;
1914
1915 return false;
1916 }
1917
1918 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1919 int r;
1920
1921 assert(link);
1922
1923 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1924 return 1;
1925
1926 r = sd_netlink_message_get_errno(m);
1927 if (r < 0)
1928 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1929
1930 return 1;
1931 }
1932
1933 static int link_configure_addrgen_mode(Link *link) {
1934 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1935 uint8_t ipv6ll_mode;
1936 int r;
1937
1938 assert(link);
1939 assert(link->network);
1940 assert(link->manager);
1941 assert(link->manager->rtnl);
1942
1943 log_link_debug(link, "Setting address genmode for link");
1944
1945 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1946 if (r < 0)
1947 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1948
1949 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1950 if (r < 0)
1951 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1952
1953 r = sd_netlink_message_open_container(req, AF_INET6);
1954 if (r < 0)
1955 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1956
1957 if (!link_ipv6ll_enabled(link))
1958 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1959 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1960 /* The file may not exist. And event if it exists, when stable_secret is unset,
1961 * reading the file fails with EIO. */
1962 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1963 else
1964 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1965
1966 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1967 if (r < 0)
1968 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1969
1970 r = sd_netlink_message_close_container(req);
1971 if (r < 0)
1972 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1973
1974 r = sd_netlink_message_close_container(req);
1975 if (r < 0)
1976 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1977
1978 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1979 link_netlink_destroy_callback, link);
1980 if (r < 0)
1981 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1982
1983 link_ref(link);
1984
1985 return 0;
1986 }
1987
1988 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1989 int r;
1990
1991 assert(link);
1992
1993 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1994 return 1;
1995
1996 r = sd_netlink_message_get_errno(m);
1997 if (r < 0)
1998 /* we warn but don't fail the link, as it may be brought up later */
1999 log_link_warning_errno(link, r, "Could not bring up interface: %m");
2000
2001 return 1;
2002 }
2003
2004 static int link_up(Link *link) {
2005 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2006 int r;
2007
2008 assert(link);
2009 assert(link->network);
2010 assert(link->manager);
2011 assert(link->manager->rtnl);
2012
2013 log_link_debug(link, "Bringing link up");
2014
2015 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2016 if (r < 0)
2017 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2018
2019 /* set it free if not enslaved with networkd */
2020 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
2021 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
2022 if (r < 0)
2023 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
2024 }
2025
2026 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
2027 if (r < 0)
2028 return log_link_error_errno(link, r, "Could not set link flags: %m");
2029
2030 if (link->network->mac) {
2031 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
2032 if (r < 0)
2033 return log_link_error_errno(link, r, "Could not set MAC address: %m");
2034 }
2035
2036 if (link_ipv6_enabled(link)) {
2037 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
2038 if (r < 0)
2039 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
2040
2041 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
2042 r = sd_netlink_message_open_container(req, AF_INET6);
2043 if (r < 0)
2044 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
2045
2046 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
2047 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
2048 if (r < 0)
2049 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
2050 }
2051
2052 r = sd_netlink_message_close_container(req);
2053 if (r < 0)
2054 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
2055
2056 r = sd_netlink_message_close_container(req);
2057 if (r < 0)
2058 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
2059 }
2060
2061 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2062 link_netlink_destroy_callback, link);
2063 if (r < 0)
2064 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2065
2066 link_ref(link);
2067
2068 return 0;
2069 }
2070
2071 static int link_up_can(Link *link) {
2072 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2073 int r;
2074
2075 assert(link);
2076
2077 log_link_debug(link, "Bringing CAN link up");
2078
2079 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2080 if (r < 0)
2081 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2082
2083 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
2084 if (r < 0)
2085 return log_link_error_errno(link, r, "Could not set link flags: %m");
2086
2087 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2088 link_netlink_destroy_callback, link);
2089 if (r < 0)
2090 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2091
2092 link_ref(link);
2093
2094 return 0;
2095 }
2096
2097 static int link_set_can(Link *link) {
2098 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
2099 int r;
2100
2101 assert(link);
2102 assert(link->network);
2103 assert(link->manager);
2104 assert(link->manager->rtnl);
2105
2106 log_link_debug(link, "link_set_can");
2107
2108 r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
2109 if (r < 0)
2110 return log_link_error_errno(link, r, "Failed to allocate netlink message: %m");
2111
2112 r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
2113 if (r < 0)
2114 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
2115
2116 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
2117 if (r < 0)
2118 return log_link_error_errno(link, r, "Failed to open netlink container: %m");
2119
2120 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
2121 if (r < 0)
2122 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
2123
2124 if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) {
2125 struct can_bittiming bt = {
2126 .bitrate = link->network->can_bitrate,
2127 .sample_point = link->network->can_sample_point,
2128 };
2129
2130 if (link->network->can_bitrate > UINT32_MAX) {
2131 log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate);
2132 return -ERANGE;
2133 }
2134
2135 log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate);
2136 if (link->network->can_sample_point > 0)
2137 log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
2138 else
2139 log_link_debug(link, "Using default sample point");
2140
2141 r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
2142 if (r < 0)
2143 return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
2144 }
2145
2146 if (link->network->can_restart_us > 0) {
2147 char time_string[FORMAT_TIMESPAN_MAX];
2148 uint64_t restart_ms;
2149
2150 if (link->network->can_restart_us == USEC_INFINITY)
2151 restart_ms = 0;
2152 else
2153 restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC);
2154
2155 format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC);
2156
2157 if (restart_ms > UINT32_MAX) {
2158 log_link_error(link, "restart timeout (%s) too big.", time_string);
2159 return -ERANGE;
2160 }
2161
2162 log_link_debug(link, "Setting restart = %s", time_string);
2163
2164 r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
2165 if (r < 0)
2166 return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
2167 }
2168
2169 if (link->network->can_triple_sampling >= 0) {
2170 struct can_ctrlmode cm = {
2171 .mask = CAN_CTRLMODE_3_SAMPLES,
2172 .flags = link->network->can_triple_sampling ? CAN_CTRLMODE_3_SAMPLES : 0,
2173 };
2174
2175 log_link_debug(link, "%sabling triple-sampling", link->network->can_triple_sampling ? "En" : "Dis");
2176
2177 r = sd_netlink_message_append_data(m, IFLA_CAN_CTRLMODE, &cm, sizeof(cm));
2178 if (r < 0)
2179 return log_link_error_errno(link, r, "Could not append IFLA_CAN_CTRLMODE attribute: %m");
2180 }
2181
2182 r = sd_netlink_message_close_container(m);
2183 if (r < 0)
2184 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2185
2186 r = sd_netlink_message_close_container(m);
2187 if (r < 0)
2188 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2189
2190 r = netlink_call_async(link->manager->rtnl, NULL, m, link_set_handler,
2191 link_netlink_destroy_callback, link);
2192 if (r < 0)
2193 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2194
2195 link_ref(link);
2196
2197 if (!(link->flags & IFF_UP)) {
2198 r = link_up_can(link);
2199 if (r < 0) {
2200 link_enter_failed(link);
2201 return r;
2202 }
2203 }
2204
2205 log_link_debug(link, "link_set_can done");
2206
2207 return r;
2208 }
2209
2210 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2211 int r;
2212
2213 assert(link);
2214
2215 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2216 return 1;
2217
2218 r = sd_netlink_message_get_errno(m);
2219 if (r < 0)
2220 log_link_warning_errno(link, r, "Could not bring down interface: %m");
2221
2222 if (streq_ptr(link->kind, "can"))
2223 link_set_can(link);
2224
2225 return 1;
2226 }
2227
2228 int link_down(Link *link) {
2229 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2230 int r;
2231
2232 assert(link);
2233 assert(link->manager);
2234 assert(link->manager->rtnl);
2235
2236 log_link_debug(link, "Bringing link down");
2237
2238 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
2239 RTM_SETLINK, link->ifindex);
2240 if (r < 0)
2241 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2242
2243 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
2244 if (r < 0)
2245 return log_link_error_errno(link, r, "Could not set link flags: %m");
2246
2247 r = netlink_call_async(link->manager->rtnl, NULL, req, link_down_handler,
2248 link_netlink_destroy_callback, link);
2249 if (r < 0)
2250 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2251
2252 link_ref(link);
2253
2254 return 0;
2255 }
2256
2257 static int link_handle_bound_to_list(Link *link) {
2258 Link *l;
2259 Iterator i;
2260 int r;
2261 bool required_up = false;
2262 bool link_is_up = false;
2263
2264 assert(link);
2265
2266 if (hashmap_isempty(link->bound_to_links))
2267 return 0;
2268
2269 if (link->flags & IFF_UP)
2270 link_is_up = true;
2271
2272 HASHMAP_FOREACH (l, link->bound_to_links, i)
2273 if (link_has_carrier(l)) {
2274 required_up = true;
2275 break;
2276 }
2277
2278 if (!required_up && link_is_up) {
2279 r = link_down(link);
2280 if (r < 0)
2281 return r;
2282 } else if (required_up && !link_is_up) {
2283 r = link_up(link);
2284 if (r < 0)
2285 return r;
2286 }
2287
2288 return 0;
2289 }
2290
2291 static int link_handle_bound_by_list(Link *link) {
2292 Iterator i;
2293 Link *l;
2294 int r;
2295
2296 assert(link);
2297
2298 if (hashmap_isempty(link->bound_by_links))
2299 return 0;
2300
2301 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2302 r = link_handle_bound_to_list(l);
2303 if (r < 0)
2304 return r;
2305 }
2306
2307 return 0;
2308 }
2309
2310 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2311 int r;
2312
2313 assert(link);
2314 assert(carrier);
2315
2316 if (link == carrier)
2317 return 0;
2318
2319 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2320 return 0;
2321
2322 r = hashmap_ensure_allocated(h, NULL);
2323 if (r < 0)
2324 return r;
2325
2326 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2327 if (r < 0)
2328 return r;
2329
2330 return 0;
2331 }
2332
2333 static int link_new_bound_by_list(Link *link) {
2334 Manager *m;
2335 Link *carrier;
2336 Iterator i;
2337 int r;
2338 bool list_updated = false;
2339
2340 assert(link);
2341 assert(link->manager);
2342
2343 m = link->manager;
2344
2345 HASHMAP_FOREACH(carrier, m->links, i) {
2346 if (!carrier->network)
2347 continue;
2348
2349 if (strv_isempty(carrier->network->bind_carrier))
2350 continue;
2351
2352 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2353 r = link_put_carrier(link, carrier, &link->bound_by_links);
2354 if (r < 0)
2355 return r;
2356
2357 list_updated = true;
2358 }
2359 }
2360
2361 if (list_updated)
2362 link_dirty(link);
2363
2364 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2365 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2366 if (r < 0)
2367 return r;
2368
2369 link_dirty(carrier);
2370 }
2371
2372 return 0;
2373 }
2374
2375 static int link_new_bound_to_list(Link *link) {
2376 Manager *m;
2377 Link *carrier;
2378 Iterator i;
2379 int r;
2380 bool list_updated = false;
2381
2382 assert(link);
2383 assert(link->manager);
2384
2385 if (!link->network)
2386 return 0;
2387
2388 if (strv_isempty(link->network->bind_carrier))
2389 return 0;
2390
2391 m = link->manager;
2392
2393 HASHMAP_FOREACH (carrier, m->links, i) {
2394 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2395 r = link_put_carrier(link, carrier, &link->bound_to_links);
2396 if (r < 0)
2397 return r;
2398
2399 list_updated = true;
2400 }
2401 }
2402
2403 if (list_updated)
2404 link_dirty(link);
2405
2406 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2407 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2408 if (r < 0)
2409 return r;
2410
2411 link_dirty(carrier);
2412 }
2413
2414 return 0;
2415 }
2416
2417 static int link_new_carrier_maps(Link *link) {
2418 int r;
2419
2420 r = link_new_bound_by_list(link);
2421 if (r < 0)
2422 return r;
2423
2424 r = link_handle_bound_by_list(link);
2425 if (r < 0)
2426 return r;
2427
2428 r = link_new_bound_to_list(link);
2429 if (r < 0)
2430 return r;
2431
2432 r = link_handle_bound_to_list(link);
2433 if (r < 0)
2434 return r;
2435
2436 return 0;
2437 }
2438
2439 static void link_free_bound_to_list(Link *link) {
2440 Link *bound_to;
2441 Iterator i;
2442
2443 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2444 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2445
2446 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2447 link_dirty(bound_to);
2448 }
2449
2450 return;
2451 }
2452
2453 static void link_free_bound_by_list(Link *link) {
2454 Link *bound_by;
2455 Iterator i;
2456
2457 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2458 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2459
2460 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2461 link_dirty(bound_by);
2462 link_handle_bound_to_list(bound_by);
2463 }
2464 }
2465
2466 return;
2467 }
2468
2469 static void link_free_carrier_maps(Link *link) {
2470 bool list_updated = false;
2471
2472 assert(link);
2473
2474 if (!hashmap_isempty(link->bound_to_links)) {
2475 link_free_bound_to_list(link);
2476 list_updated = true;
2477 }
2478
2479 if (!hashmap_isempty(link->bound_by_links)) {
2480 link_free_bound_by_list(link);
2481 list_updated = true;
2482 }
2483
2484 if (list_updated)
2485 link_dirty(link);
2486
2487 return;
2488 }
2489
2490 static int link_append_to_master(Link *link, NetDev *netdev) {
2491 Link *master;
2492 int r;
2493
2494 assert(link);
2495 assert(netdev);
2496
2497 r = link_get(link->manager, netdev->ifindex, &master);
2498 if (r < 0)
2499 return r;
2500
2501 r = set_ensure_allocated(&master->slaves, NULL);
2502 if (r < 0)
2503 return r;
2504
2505 r = set_put(master->slaves, link);
2506 if (r < 0)
2507 return r;
2508
2509 link_ref(link);
2510 return 0;
2511 }
2512
2513 static void link_drop_from_master(Link *link, NetDev *netdev) {
2514 Link *master;
2515
2516 assert(link);
2517
2518 if (!link->manager || !netdev)
2519 return;
2520
2521 if (link_get(link->manager, netdev->ifindex, &master) < 0)
2522 return;
2523
2524 link_unref(set_remove(master->slaves, link));
2525 }
2526
2527 static void link_detach_from_manager(Link *link) {
2528 if (!link || !link->manager)
2529 return;
2530
2531 link_unref(set_remove(link->manager->links_requesting_uuid, link));
2532 link_clean(link);
2533
2534 /* The following must be called at last. */
2535 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2536 link_unref(link);
2537 }
2538
2539 void link_drop(Link *link) {
2540 if (!link || link->state == LINK_STATE_LINGER)
2541 return;
2542
2543 link_set_state(link, LINK_STATE_LINGER);
2544
2545 link_free_carrier_maps(link);
2546
2547 if (link->network) {
2548 link_drop_from_master(link, link->network->bridge);
2549 link_drop_from_master(link, link->network->bond);
2550 }
2551
2552 log_link_debug(link, "Link removed");
2553
2554 (void) unlink(link->state_file);
2555 link_detach_from_manager(link);
2556 }
2557
2558 static int link_joined(Link *link) {
2559 int r;
2560
2561 assert(link);
2562 assert(link->network);
2563
2564 if (!hashmap_isempty(link->bound_to_links)) {
2565 r = link_handle_bound_to_list(link);
2566 if (r < 0)
2567 return r;
2568 } else if (!(link->flags & IFF_UP)) {
2569 r = link_up(link);
2570 if (r < 0) {
2571 link_enter_failed(link);
2572 return r;
2573 }
2574 }
2575
2576 if (link->network->bridge) {
2577 r = link_set_bridge(link);
2578 if (r < 0)
2579 log_link_error_errno(link, r, "Could not set bridge message: %m");
2580
2581 r = link_append_to_master(link, link->network->bridge);
2582 if (r < 0)
2583 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2584 }
2585
2586 if (link->network->bond) {
2587 r = link_set_bond(link);
2588 if (r < 0)
2589 log_link_error_errno(link, r, "Could not set bond message: %m");
2590
2591 r = link_append_to_master(link, link->network->bond);
2592 if (r < 0)
2593 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2594 }
2595
2596 if (link->network->use_br_vlan &&
2597 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2598 r = link_set_bridge_vlan(link);
2599 if (r < 0)
2600 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2601 }
2602
2603 /* Skip setting up addresses until it gets carrier,
2604 or it would try to set addresses twice,
2605 which is bad for non-idempotent steps. */
2606 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2607 return 0;
2608
2609 return link_request_set_addresses(link);
2610 }
2611
2612 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2613 int r;
2614
2615 assert(link);
2616 assert(link->network);
2617 assert(link->enslaving > 0);
2618 assert(!link->enslaved_raw);
2619
2620 link->enslaving--;
2621
2622 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2623 return 1;
2624
2625 r = sd_netlink_message_get_errno(m);
2626 if (r < 0 && r != -EEXIST) {
2627 log_link_error_errno(link, r, "Could not join netdev: %m");
2628 link_enter_failed(link);
2629 return 1;
2630 } else
2631 log_link_debug(link, "Joined netdev");
2632
2633 if (link->enslaving == 0) {
2634 link->enslaved_raw = true;
2635 link_joined(link);
2636 }
2637
2638 return 1;
2639 }
2640
2641 static int link_enter_join_netdev(Link *link) {
2642 NetDev *netdev;
2643 Iterator i;
2644 int r;
2645
2646 assert(link);
2647 assert(link->network);
2648 assert(link->state == LINK_STATE_INITIALIZED);
2649
2650 link_set_state(link, LINK_STATE_CONFIGURING);
2651
2652 link_dirty(link);
2653 link->enslaving = 0;
2654 link->enslaved_raw = false;
2655
2656 if (link->network->bond) {
2657 if (link->network->bond->state == NETDEV_STATE_READY &&
2658 link->network->bond->ifindex == link->master_ifindex)
2659 return link_joined(link);
2660
2661 log_struct(LOG_DEBUG,
2662 LOG_LINK_INTERFACE(link),
2663 LOG_NETDEV_INTERFACE(link->network->bond),
2664 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2665
2666 link->enslaving++;
2667
2668 r = netdev_join(link->network->bond, link, netdev_join_handler);
2669 if (r < 0) {
2670 log_struct_errno(LOG_WARNING, r,
2671 LOG_LINK_INTERFACE(link),
2672 LOG_NETDEV_INTERFACE(link->network->bond),
2673 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2674 link_enter_failed(link);
2675 return r;
2676 }
2677 }
2678
2679 if (link->network->bridge) {
2680 log_struct(LOG_DEBUG,
2681 LOG_LINK_INTERFACE(link),
2682 LOG_NETDEV_INTERFACE(link->network->bridge),
2683 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2684
2685 link->enslaving++;
2686
2687 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2688 if (r < 0) {
2689 log_struct_errno(LOG_WARNING, r,
2690 LOG_LINK_INTERFACE(link),
2691 LOG_NETDEV_INTERFACE(link->network->bridge),
2692 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2693 link_enter_failed(link);
2694 return r;
2695 }
2696 }
2697
2698 if (link->network->vrf) {
2699 log_struct(LOG_DEBUG,
2700 LOG_LINK_INTERFACE(link),
2701 LOG_NETDEV_INTERFACE(link->network->vrf),
2702 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2703
2704 link->enslaving++;
2705
2706 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2707 if (r < 0) {
2708 log_struct_errno(LOG_WARNING, r,
2709 LOG_LINK_INTERFACE(link),
2710 LOG_NETDEV_INTERFACE(link->network->vrf),
2711 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2712 link_enter_failed(link);
2713 return r;
2714 }
2715 }
2716
2717 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2718
2719 if (netdev->ifindex > 0)
2720 /* Assume already enslaved. */
2721 continue;
2722
2723 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2724 continue;
2725
2726 log_struct(LOG_DEBUG,
2727 LOG_LINK_INTERFACE(link),
2728 LOG_NETDEV_INTERFACE(netdev),
2729 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2730
2731 link->enslaving++;
2732
2733 r = netdev_join(netdev, link, netdev_join_handler);
2734 if (r < 0) {
2735 log_struct_errno(LOG_WARNING, r,
2736 LOG_LINK_INTERFACE(link),
2737 LOG_NETDEV_INTERFACE(netdev),
2738 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2739 link_enter_failed(link);
2740 return r;
2741 }
2742 }
2743
2744 if (link->enslaving == 0)
2745 return link_joined(link);
2746
2747 return 0;
2748 }
2749
2750 static int link_set_ipv4_forward(Link *link) {
2751 int r;
2752
2753 if (!link_ipv4_forward_enabled(link))
2754 return 0;
2755
2756 /* We propagate the forwarding flag from one interface to the
2757 * global setting one way. This means: as long as at least one
2758 * interface was configured at any time that had IP forwarding
2759 * enabled the setting will stay on for good. We do this
2760 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2761 * somewhat in sync (see below). */
2762
2763 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2764 if (r < 0)
2765 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2766
2767 return 0;
2768 }
2769
2770 static int link_set_ipv6_forward(Link *link) {
2771 int r;
2772
2773 if (!link_ipv6_forward_enabled(link))
2774 return 0;
2775
2776 /* On Linux, the IPv6 stack does not know a per-interface
2777 * packet forwarding setting: either packet forwarding is on
2778 * for all, or off for all. We hence don't bother with a
2779 * per-interface setting, but simply propagate the interface
2780 * flag, if it is set, to the global flag, one-way. Note that
2781 * while IPv4 would allow a per-interface flag, we expose the
2782 * same behaviour there and also propagate the setting from
2783 * one to all, to keep things simple (see above). */
2784
2785 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2786 if (r < 0)
2787 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2788
2789 return 0;
2790 }
2791
2792 static int link_set_ipv6_privacy_extensions(Link *link) {
2793 IPv6PrivacyExtensions s;
2794 int r;
2795
2796 s = link_ipv6_privacy_extensions(link);
2797 if (s < 0)
2798 return 0;
2799
2800 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2801 if (r < 0)
2802 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2803
2804 return 0;
2805 }
2806
2807 static int link_set_ipv6_accept_ra(Link *link) {
2808 int r;
2809
2810 /* Make this a NOP if IPv6 is not available */
2811 if (!socket_ipv6_is_supported())
2812 return 0;
2813
2814 if (link->flags & IFF_LOOPBACK)
2815 return 0;
2816
2817 if (!link->network)
2818 return 0;
2819
2820 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2821 if (r < 0)
2822 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2823
2824 return 0;
2825 }
2826
2827 static int link_set_ipv6_dad_transmits(Link *link) {
2828 int r;
2829
2830 /* Make this a NOP if IPv6 is not available */
2831 if (!socket_ipv6_is_supported())
2832 return 0;
2833
2834 if (link->flags & IFF_LOOPBACK)
2835 return 0;
2836
2837 if (!link->network)
2838 return 0;
2839
2840 if (link->network->ipv6_dad_transmits < 0)
2841 return 0;
2842
2843 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2844 if (r < 0)
2845 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2846
2847 return 0;
2848 }
2849
2850 static int link_set_ipv6_hop_limit(Link *link) {
2851 int r;
2852
2853 /* Make this a NOP if IPv6 is not available */
2854 if (!socket_ipv6_is_supported())
2855 return 0;
2856
2857 if (link->flags & IFF_LOOPBACK)
2858 return 0;
2859
2860 if (!link->network)
2861 return 0;
2862
2863 if (link->network->ipv6_hop_limit < 0)
2864 return 0;
2865
2866 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2867 if (r < 0)
2868 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2869
2870 return 0;
2871 }
2872
2873 static int link_set_ipv6_mtu(Link *link) {
2874 int r;
2875
2876 /* Make this a NOP if IPv6 is not available */
2877 if (!socket_ipv6_is_supported())
2878 return 0;
2879
2880 if (link->flags & IFF_LOOPBACK)
2881 return 0;
2882
2883 if (link->network->ipv6_mtu == 0)
2884 return 0;
2885
2886 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2887 if (r < 0)
2888 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2889
2890 return 0;
2891 }
2892
2893 static bool link_is_static_address_configured(Link *link, Address *address) {
2894 Address *net_address;
2895
2896 assert(link);
2897 assert(address);
2898
2899 if (!link->network)
2900 return false;
2901
2902 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2903 if (address_equal(net_address, address))
2904 return true;
2905
2906 return false;
2907 }
2908
2909 static bool link_is_static_route_configured(Link *link, Route *route) {
2910 Route *net_route;
2911
2912 assert(link);
2913 assert(route);
2914
2915 if (!link->network)
2916 return false;
2917
2918 LIST_FOREACH(routes, net_route, link->network->static_routes)
2919 if (route_equal(net_route, route))
2920 return true;
2921
2922 return false;
2923 }
2924
2925 static int link_drop_foreign_config(Link *link) {
2926 Address *address;
2927 Route *route;
2928 Iterator i;
2929 int r;
2930
2931 SET_FOREACH(address, link->addresses_foreign, i) {
2932 /* we consider IPv6LL addresses to be managed by the kernel */
2933 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2934 continue;
2935
2936 if (link_is_static_address_configured(link, address)) {
2937 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2938 if (r < 0)
2939 return log_link_error_errno(link, r, "Failed to add address: %m");
2940 } else {
2941 r = address_remove(address, link, NULL);
2942 if (r < 0)
2943 return r;
2944 }
2945 }
2946
2947 SET_FOREACH(route, link->routes_foreign, i) {
2948 /* do not touch routes managed by the kernel */
2949 if (route->protocol == RTPROT_KERNEL)
2950 continue;
2951
2952 if (link_is_static_route_configured(link, route)) {
2953 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2954 if (r < 0)
2955 return r;
2956 } else {
2957 r = route_remove(route, link, NULL);
2958 if (r < 0)
2959 return r;
2960 }
2961 }
2962
2963 return 0;
2964 }
2965
2966 static int link_drop_config(Link *link) {
2967 Address *address, *pool_address;
2968 Route *route;
2969 Iterator i;
2970 int r;
2971
2972 SET_FOREACH(address, link->addresses, i) {
2973 /* we consider IPv6LL addresses to be managed by the kernel */
2974 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2975 continue;
2976
2977 r = address_remove(address, link, NULL);
2978 if (r < 0)
2979 return r;
2980
2981 /* If this address came from an address pool, clean up the pool */
2982 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2983 if (address_equal(address, pool_address)) {
2984 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2985 address_free(pool_address);
2986 break;
2987 }
2988 }
2989 }
2990
2991 SET_FOREACH(route, link->routes, i) {
2992 /* do not touch routes managed by the kernel */
2993 if (route->protocol == RTPROT_KERNEL)
2994 continue;
2995
2996 r = route_remove(route, link, NULL);
2997 if (r < 0)
2998 return r;
2999 }
3000
3001 ndisc_flush(link);
3002
3003 return 0;
3004 }
3005
3006 static int link_update_lldp(Link *link) {
3007 int r;
3008
3009 assert(link);
3010
3011 if (!link->lldp)
3012 return 0;
3013
3014 if (link->flags & IFF_UP) {
3015 r = sd_lldp_start(link->lldp);
3016 if (r > 0)
3017 log_link_debug(link, "Started LLDP.");
3018 } else {
3019 r = sd_lldp_stop(link->lldp);
3020 if (r > 0)
3021 log_link_debug(link, "Stopped LLDP.");
3022 }
3023
3024 return r;
3025 }
3026
3027 static int link_configure_can(Link *link) {
3028 int r;
3029
3030 if (streq_ptr(link->kind, "can")) {
3031 /* The CAN interface must be down to configure bitrate, etc... */
3032 if ((link->flags & IFF_UP)) {
3033 r = link_down(link);
3034 if (r < 0) {
3035 link_enter_failed(link);
3036 return r;
3037 }
3038
3039 return 0;
3040 }
3041
3042 return link_set_can(link);
3043 }
3044
3045 if (!(link->flags & IFF_UP)) {
3046 r = link_up_can(link);
3047 if (r < 0) {
3048 link_enter_failed(link);
3049 return r;
3050 }
3051 }
3052
3053 return 0;
3054 }
3055
3056 static int link_configure(Link *link) {
3057 int r;
3058
3059 assert(link);
3060 assert(link->network);
3061 assert(link->state == LINK_STATE_INITIALIZED);
3062
3063 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
3064 return link_configure_can(link);
3065
3066 /* Drop foreign config, but ignore loopback or critical devices.
3067 * We do not want to remove loopback address or addresses used for root NFS. */
3068 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
3069 r = link_drop_foreign_config(link);
3070 if (r < 0)
3071 return r;
3072 }
3073
3074 r = link_set_proxy_arp(link);
3075 if (r < 0)
3076 return r;
3077
3078 r = ipv6_proxy_ndp_addresses_configure(link);
3079 if (r < 0)
3080 return r;
3081
3082 r = link_set_ipv4_forward(link);
3083 if (r < 0)
3084 return r;
3085
3086 r = link_set_ipv6_forward(link);
3087 if (r < 0)
3088 return r;
3089
3090 r = link_set_ipv6_privacy_extensions(link);
3091 if (r < 0)
3092 return r;
3093
3094 r = link_set_ipv6_accept_ra(link);
3095 if (r < 0)
3096 return r;
3097
3098 r = link_set_ipv6_dad_transmits(link);
3099 if (r < 0)
3100 return r;
3101
3102 r = link_set_ipv6_hop_limit(link);
3103 if (r < 0)
3104 return r;
3105
3106 r = link_set_flags(link);
3107 if (r < 0)
3108 return r;
3109
3110 r = link_set_ipv6_mtu(link);
3111 if (r < 0)
3112 return r;
3113
3114 if (link_ipv4ll_enabled(link) || link_ipv4ll_fallback_enabled(link)) {
3115 r = ipv4ll_configure(link);
3116 if (r < 0)
3117 return r;
3118 }
3119
3120 if (link_dhcp4_enabled(link)) {
3121 r = dhcp4_set_promote_secondaries(link);
3122 if (r < 0)
3123 return r;
3124
3125 r = dhcp4_configure(link);
3126 if (r < 0)
3127 return r;
3128 }
3129
3130 if (link_dhcp4_server_enabled(link)) {
3131 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
3132 if (r < 0)
3133 return r;
3134
3135 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
3136 if (r < 0)
3137 return r;
3138 }
3139
3140 if (link_dhcp6_enabled(link) ||
3141 link_ipv6_accept_ra_enabled(link)) {
3142 r = dhcp6_configure(link);
3143 if (r < 0)
3144 return r;
3145 }
3146
3147 if (link_ipv6_accept_ra_enabled(link)) {
3148 r = ndisc_configure(link);
3149 if (r < 0)
3150 return r;
3151 }
3152
3153 if (link_radv_enabled(link)) {
3154 r = radv_configure(link);
3155 if (r < 0)
3156 return r;
3157 }
3158
3159 if (link_lldp_rx_enabled(link)) {
3160 r = sd_lldp_new(&link->lldp);
3161 if (r < 0)
3162 return r;
3163
3164 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
3165 if (r < 0)
3166 return r;
3167
3168 r = sd_lldp_match_capabilities(link->lldp,
3169 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
3170 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
3171 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
3172 if (r < 0)
3173 return r;
3174
3175 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
3176 if (r < 0)
3177 return r;
3178
3179 r = sd_lldp_attach_event(link->lldp, NULL, 0);
3180 if (r < 0)
3181 return r;
3182
3183 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
3184 if (r < 0)
3185 return r;
3186
3187 r = link_update_lldp(link);
3188 if (r < 0)
3189 return r;
3190 }
3191
3192 r = link_set_mtu(link, link->network->mtu, link->network->mtu_is_set);
3193 if (r < 0)
3194 return r;
3195
3196 if (socket_ipv6_is_supported()) {
3197 r = link_configure_addrgen_mode(link);
3198 if (r < 0)
3199 return r;
3200 }
3201
3202 return link_configure_after_setting_mtu(link);
3203 }
3204
3205 static int link_configure_after_setting_mtu(Link *link) {
3206 int r;
3207
3208 assert(link);
3209 assert(link->network);
3210 assert(link->state == LINK_STATE_INITIALIZED);
3211
3212 if (link->setting_mtu)
3213 return 0;
3214
3215 if (link_has_carrier(link) || link->network->configure_without_carrier) {
3216 r = link_acquire_conf(link);
3217 if (r < 0)
3218 return r;
3219 }
3220
3221 return link_enter_join_netdev(link);
3222 }
3223
3224 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3225 assert(duid);
3226
3227 if (duid->raw_data_len > 0)
3228 return 0;
3229
3230 if (duid->type != DUID_TYPE_UUID)
3231 return -EINVAL;
3232
3233 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3234 duid->raw_data_len = sizeof(sd_id128_t);
3235
3236 return 1;
3237 }
3238
3239 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3240 Manager *manager = userdata;
3241 const sd_bus_error *e;
3242 const void *a;
3243 size_t sz;
3244 DUID *duid;
3245 Link *link;
3246 int r;
3247
3248 assert(m);
3249 assert(manager);
3250
3251 e = sd_bus_message_get_error(m);
3252 if (e) {
3253 log_error_errno(sd_bus_error_get_errno(e),
3254 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3255 e->message);
3256 goto configure;
3257 }
3258
3259 r = sd_bus_message_read_array(m, 'y', &a, &sz);
3260 if (r < 0)
3261 goto configure;
3262
3263 if (sz != sizeof(sd_id128_t)) {
3264 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3265 goto configure;
3266 }
3267
3268 memcpy(&manager->product_uuid, a, sz);
3269 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3270 (void) duid_set_uuid(duid, manager->product_uuid);
3271
3272 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3273
3274 configure:
3275 while ((link = set_steal_first(manager->links_requesting_uuid))) {
3276 r = link_configure(link);
3277 if (r < 0)
3278 log_link_error_errno(link, r, "Failed to configure link: %m");
3279 }
3280
3281 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3282
3283 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3284 * even if the method fails. */
3285 manager->has_product_uuid = true;
3286
3287 return 1;
3288 }
3289
3290 static bool link_requires_uuid(Link *link) {
3291 const DUID *duid;
3292
3293 assert(link);
3294 assert(link->manager);
3295 assert(link->network);
3296
3297 duid = link_get_duid(link);
3298 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3299 return false;
3300
3301 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3302 return true;
3303
3304 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3305 return true;
3306
3307 return false;
3308 }
3309
3310 static int link_configure_duid(Link *link) {
3311 Manager *m;
3312 DUID *duid;
3313 int r;
3314
3315 assert(link);
3316 assert(link->manager);
3317 assert(link->network);
3318
3319 m = link->manager;
3320 duid = link_get_duid(link);
3321
3322 if (!link_requires_uuid(link))
3323 return 1;
3324
3325 if (m->has_product_uuid) {
3326 (void) duid_set_uuid(duid, m->product_uuid);
3327 return 1;
3328 }
3329
3330 if (!m->links_requesting_uuid) {
3331 r = manager_request_product_uuid(m, link);
3332 if (r < 0) {
3333 if (r == -ENOMEM)
3334 return r;
3335
3336 log_link_warning_errno(link, r,
3337 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3338 return 1;
3339 }
3340 } else {
3341 r = set_put(m->links_requesting_uuid, link);
3342 if (r < 0)
3343 return log_oom();
3344
3345 r = set_put(m->duids_requesting_uuid, duid);
3346 if (r < 0)
3347 return log_oom();
3348 }
3349
3350 return 0;
3351 }
3352
3353 static int link_initialized_and_synced(Link *link) {
3354 Network *network;
3355 int r;
3356
3357 assert(link);
3358 assert(link->ifname);
3359 assert(link->manager);
3360
3361 /* We may get called either from the asynchronous netlink callback,
3362 * or directly for link_add() if running in a container. See link_add(). */
3363 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3364 return 0;
3365
3366 log_link_debug(link, "Link state is up-to-date");
3367 link_set_state(link, LINK_STATE_INITIALIZED);
3368
3369 r = link_new_bound_by_list(link);
3370 if (r < 0)
3371 return r;
3372
3373 r = link_handle_bound_by_list(link);
3374 if (r < 0)
3375 return r;
3376
3377 if (!link->network) {
3378 r = network_get(link->manager, link->sd_device, link->ifname,
3379 &link->mac, &network);
3380 if (r == -ENOENT) {
3381 link_enter_unmanaged(link);
3382 return 0;
3383 } else if (r == 0 && network->unmanaged) {
3384 link_enter_unmanaged(link);
3385 return 0;
3386 } else if (r < 0)
3387 return r;
3388
3389 if (link->flags & IFF_LOOPBACK) {
3390 if (network->link_local != ADDRESS_FAMILY_NO)
3391 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3392
3393 if (network->dhcp != ADDRESS_FAMILY_NO)
3394 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3395
3396 if (network->dhcp_server)
3397 log_link_debug(link, "Ignoring DHCP server for loopback link");
3398 }
3399
3400 r = network_apply(network, link);
3401 if (r < 0)
3402 return r;
3403 }
3404
3405 r = link_new_bound_to_list(link);
3406 if (r < 0)
3407 return r;
3408
3409 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3410 * link_configure() is called later asynchronously. */
3411 r = link_configure_duid(link);
3412 if (r <= 0)
3413 return r;
3414
3415 r = link_configure(link);
3416 if (r < 0)
3417 return r;
3418
3419 return 0;
3420 }
3421
3422 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3423 (void) link_initialized_and_synced(link);
3424 return 1;
3425 }
3426
3427 int link_initialized(Link *link, sd_device *device) {
3428 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3429 int r;
3430
3431 assert(link);
3432 assert(link->manager);
3433 assert(link->manager->rtnl);
3434 assert(device);
3435
3436 if (link->state != LINK_STATE_PENDING)
3437 return 0;
3438
3439 if (link->sd_device)
3440 return 0;
3441
3442 log_link_debug(link, "udev initialized link");
3443 link_set_state(link, LINK_STATE_INITIALIZED);
3444
3445 link->sd_device = sd_device_ref(device);
3446
3447 /* udev has initialized the link, but we don't know if we have yet
3448 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3449 * when it returns we know that the pending NEWLINKs have already been
3450 * processed and that we are up-to-date */
3451
3452 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3453 link->ifindex);
3454 if (r < 0)
3455 return r;
3456
3457 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3458 link_netlink_destroy_callback, link);
3459 if (r < 0)
3460 return r;
3461
3462 link_ref(link);
3463
3464 return 0;
3465 }
3466
3467 static int link_load(Link *link) {
3468 _cleanup_free_ char *network_file = NULL,
3469 *addresses = NULL,
3470 *routes = NULL,
3471 *dhcp4_address = NULL,
3472 *ipv4ll_address = NULL;
3473 union in_addr_union address;
3474 union in_addr_union route_dst;
3475 const char *p;
3476 int r;
3477
3478 assert(link);
3479
3480 r = parse_env_file(NULL, link->state_file,
3481 "NETWORK_FILE", &network_file,
3482 "ADDRESSES", &addresses,
3483 "ROUTES", &routes,
3484 "DHCP4_ADDRESS", &dhcp4_address,
3485 "IPV4LL_ADDRESS", &ipv4ll_address);
3486 if (r < 0 && r != -ENOENT)
3487 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3488
3489 if (network_file) {
3490 Network *network;
3491 char *suffix;
3492
3493 /* drop suffix */
3494 suffix = strrchr(network_file, '.');
3495 if (!suffix) {
3496 log_link_debug(link, "Failed to get network name from %s", network_file);
3497 goto network_file_fail;
3498 }
3499 *suffix = '\0';
3500
3501 r = network_get_by_name(link->manager, basename(network_file), &network);
3502 if (r < 0) {
3503 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3504 goto network_file_fail;
3505 }
3506
3507 r = network_apply(network, link);
3508 if (r < 0)
3509 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3510 }
3511
3512 network_file_fail:
3513
3514 if (addresses) {
3515 p = addresses;
3516
3517 for (;;) {
3518 _cleanup_free_ char *address_str = NULL;
3519 char *prefixlen_str;
3520 int family;
3521 unsigned char prefixlen;
3522
3523 r = extract_first_word(&p, &address_str, NULL, 0);
3524 if (r < 0) {
3525 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3526 continue;
3527 }
3528 if (r == 0)
3529 break;
3530
3531 prefixlen_str = strchr(address_str, '/');
3532 if (!prefixlen_str) {
3533 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3534 continue;
3535 }
3536
3537 *prefixlen_str++ = '\0';
3538
3539 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3540 if (r != 1) {
3541 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3542 continue;
3543 }
3544
3545 r = in_addr_from_string_auto(address_str, &family, &address);
3546 if (r < 0) {
3547 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3548 continue;
3549 }
3550
3551 r = address_add(link, family, &address, prefixlen, NULL);
3552 if (r < 0)
3553 return log_link_error_errno(link, r, "Failed to add address: %m");
3554 }
3555 }
3556
3557 if (routes) {
3558 p = routes;
3559
3560 for (;;) {
3561 Route *route;
3562 _cleanup_free_ char *route_str = NULL;
3563 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3564 usec_t lifetime;
3565 char *prefixlen_str;
3566 int family;
3567 unsigned char prefixlen, tos, table;
3568 uint32_t priority;
3569
3570 r = extract_first_word(&p, &route_str, NULL, 0);
3571 if (r < 0) {
3572 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3573 continue;
3574 }
3575 if (r == 0)
3576 break;
3577
3578 prefixlen_str = strchr(route_str, '/');
3579 if (!prefixlen_str) {
3580 log_link_debug(link, "Failed to parse route %s", route_str);
3581 continue;
3582 }
3583
3584 *prefixlen_str++ = '\0';
3585
3586 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3587 if (r != 5) {
3588 log_link_debug(link,
3589 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3590 prefixlen_str);
3591 continue;
3592 }
3593
3594 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3595 if (r < 0) {
3596 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3597 continue;
3598 }
3599
3600 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3601 if (r < 0)
3602 return log_link_error_errno(link, r, "Failed to add route: %m");
3603
3604 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3605 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3606 0, route_expire_handler, route);
3607 if (r < 0)
3608 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3609 }
3610
3611 route->lifetime = lifetime;
3612 sd_event_source_unref(route->expire);
3613 route->expire = TAKE_PTR(expire);
3614 }
3615 }
3616
3617 if (dhcp4_address) {
3618 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3619 if (r < 0) {
3620 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3621 goto dhcp4_address_fail;
3622 }
3623
3624 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3625 if (r < 0)
3626 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3627
3628 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3629 if (r < 0)
3630 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3631 }
3632
3633 dhcp4_address_fail:
3634
3635 if (ipv4ll_address) {
3636 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3637 if (r < 0) {
3638 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3639 goto ipv4ll_address_fail;
3640 }
3641
3642 r = sd_ipv4ll_new(&link->ipv4ll);
3643 if (r < 0)
3644 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3645
3646 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3647 if (r < 0)
3648 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3649 }
3650
3651 ipv4ll_address_fail:
3652
3653 return 0;
3654 }
3655
3656 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3657 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3658 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3659 Link *link;
3660 int r;
3661
3662 assert(m);
3663 assert(m->rtnl);
3664 assert(message);
3665 assert(ret);
3666
3667 r = link_new(m, message, ret);
3668 if (r < 0)
3669 return r;
3670
3671 link = *ret;
3672
3673 log_link_debug(link, "Link %d added", link->ifindex);
3674
3675 r = link_load(link);
3676 if (r < 0)
3677 return r;
3678
3679 if (detect_container() <= 0) {
3680 /* not in a container, udev will be around */
3681 sprintf(ifindex_str, "n%d", link->ifindex);
3682 r = sd_device_new_from_device_id(&device, ifindex_str);
3683 if (r < 0) {
3684 log_link_warning_errno(link, r, "Could not find device: %m");
3685 goto failed;
3686 }
3687
3688 r = sd_device_get_is_initialized(device);
3689 if (r < 0) {
3690 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3691 goto failed;
3692 }
3693 if (r == 0) {
3694 /* not yet ready */
3695 log_link_debug(link, "link pending udev initialization...");
3696 return 0;
3697 }
3698
3699 r = device_is_renaming(device);
3700 if (r < 0) {
3701 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3702 goto failed;
3703 }
3704 if (r > 0) {
3705 log_link_debug(link, "Interface is under renaming, pending initialization.");
3706 return 0;
3707 }
3708
3709 r = link_initialized(link, device);
3710 if (r < 0)
3711 goto failed;
3712 } else {
3713 r = link_initialized_and_synced(link);
3714 if (r < 0)
3715 goto failed;
3716 }
3717
3718 return 0;
3719 failed:
3720 link_enter_failed(link);
3721 return r;
3722 }
3723
3724 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3725 int r;
3726
3727 assert(link);
3728
3729 log_link_info(link, "Gained IPv6LL");
3730
3731 link->ipv6ll_address = *address;
3732 link_check_ready(link);
3733
3734 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3735 r = link_acquire_ipv6_conf(link);
3736 if (r < 0) {
3737 link_enter_failed(link);
3738 return r;
3739 }
3740 }
3741
3742 return 0;
3743 }
3744
3745 static int link_carrier_gained(Link *link) {
3746 int r;
3747
3748 assert(link);
3749
3750 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3751 r = link_acquire_conf(link);
3752 if (r < 0) {
3753 link_enter_failed(link);
3754 return r;
3755 }
3756
3757 r = link_request_set_addresses(link);
3758 if (r < 0)
3759 return r;
3760 }
3761
3762 r = link_handle_bound_by_list(link);
3763 if (r < 0)
3764 return r;
3765
3766 return 0;
3767 }
3768
3769 static int link_carrier_lost(Link *link) {
3770 int r;
3771
3772 assert(link);
3773
3774 if (link->network && link->network->ignore_carrier_loss)
3775 return 0;
3776
3777 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3778 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3779 * configuration and stop the clients as well. */
3780 if (link->setting_mtu)
3781 return 0;
3782
3783 r = link_stop_clients(link);
3784 if (r < 0) {
3785 link_enter_failed(link);
3786 return r;
3787 }
3788
3789 if (link_dhcp4_server_enabled(link))
3790 (void) sd_dhcp_server_stop(link->dhcp_server);
3791
3792 r = link_drop_config(link);
3793 if (r < 0)
3794 return r;
3795
3796 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3797 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3798 r = link_drop_foreign_config(link);
3799 if (r < 0)
3800 return r;
3801 }
3802
3803 r = link_handle_bound_by_list(link);
3804 if (r < 0)
3805 return r;
3806
3807 return 0;
3808 }
3809
3810 int link_carrier_reset(Link *link) {
3811 int r;
3812
3813 assert(link);
3814
3815 if (link_has_carrier(link)) {
3816 r = link_carrier_lost(link);
3817 if (r < 0)
3818 return r;
3819
3820 r = link_carrier_gained(link);
3821 if (r < 0)
3822 return r;
3823
3824 log_link_info(link, "Reset carrier");
3825 }
3826
3827 return 0;
3828 }
3829
3830 int link_update(Link *link, sd_netlink_message *m) {
3831 struct ether_addr mac;
3832 const char *ifname;
3833 uint32_t mtu;
3834 bool had_carrier, carrier_gained, carrier_lost;
3835 int r;
3836
3837 assert(link);
3838 assert(link->ifname);
3839 assert(m);
3840
3841 if (link->state == LINK_STATE_LINGER) {
3842 log_link_info(link, "Link re-added");
3843 link_set_state(link, LINK_STATE_CONFIGURING);
3844
3845 r = link_new_carrier_maps(link);
3846 if (r < 0)
3847 return r;
3848 }
3849
3850 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3851 if (r >= 0 && !streq(ifname, link->ifname)) {
3852 Manager *manager = link->manager;
3853
3854 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3855
3856 link_drop(link);
3857 r = link_add(manager, m, &link);
3858 if (r < 0)
3859 return r;
3860 }
3861
3862 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3863 if (r >= 0 && mtu > 0) {
3864 link->mtu = mtu;
3865 if (link->original_mtu == 0) {
3866 link->original_mtu = mtu;
3867 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3868 }
3869
3870 if (link->dhcp_client) {
3871 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3872 link->mtu);
3873 if (r < 0)
3874 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3875 }
3876
3877 if (link->radv) {
3878 r = sd_radv_set_mtu(link->radv, link->mtu);
3879 if (r < 0)
3880 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3881 }
3882 }
3883
3884 /* The kernel may broadcast NEWLINK messages without the MAC address
3885 set, simply ignore them. */
3886 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3887 if (r >= 0) {
3888 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3889 ETH_ALEN)) {
3890
3891 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3892 ETH_ALEN);
3893
3894 log_link_debug(link, "MAC address: "
3895 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3896 mac.ether_addr_octet[0],
3897 mac.ether_addr_octet[1],
3898 mac.ether_addr_octet[2],
3899 mac.ether_addr_octet[3],
3900 mac.ether_addr_octet[4],
3901 mac.ether_addr_octet[5]);
3902
3903 if (link->ipv4ll) {
3904 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3905 if (r < 0)
3906 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3907 }
3908
3909 if (link->dhcp_client) {
3910 r = sd_dhcp_client_set_mac(link->dhcp_client,
3911 (const uint8_t *) &link->mac,
3912 sizeof (link->mac),
3913 ARPHRD_ETHER);
3914 if (r < 0)
3915 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3916
3917 r = dhcp4_set_client_identifier(link);
3918 if (r < 0)
3919 return r;
3920 }
3921
3922 if (link->dhcp6_client) {
3923 const DUID* duid = link_get_duid(link);
3924
3925 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3926 (const uint8_t *) &link->mac,
3927 sizeof (link->mac),
3928 ARPHRD_ETHER);
3929 if (r < 0)
3930 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3931
3932 if (link->network->iaid_set) {
3933 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3934 link->network->iaid);
3935 if (r < 0)
3936 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3937 }
3938
3939 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3940 duid->type,
3941 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3942 duid->raw_data_len);
3943 if (r < 0)
3944 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3945 }
3946
3947 if (link->radv) {
3948 r = sd_radv_set_mac(link->radv, &link->mac);
3949 if (r < 0)
3950 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3951 }
3952
3953 if (link->ndisc) {
3954 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3955 if (r < 0)
3956 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3957 }
3958 }
3959 }
3960
3961 had_carrier = link_has_carrier(link);
3962
3963 r = link_update_flags(link, m);
3964 if (r < 0)
3965 return r;
3966
3967 r = link_update_lldp(link);
3968 if (r < 0)
3969 return r;
3970
3971 carrier_gained = !had_carrier && link_has_carrier(link);
3972 carrier_lost = had_carrier && !link_has_carrier(link);
3973
3974 if (carrier_gained) {
3975 log_link_info(link, "Gained carrier");
3976
3977 r = link_carrier_gained(link);
3978 if (r < 0)
3979 return r;
3980 } else if (carrier_lost) {
3981 log_link_info(link, "Lost carrier");
3982
3983 r = link_carrier_lost(link);
3984 if (r < 0)
3985 return r;
3986 }
3987
3988 return 0;
3989 }
3990
3991 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3992 bool space = false;
3993 Iterator i;
3994 Link *link;
3995
3996 assert(f);
3997 assert(prefix);
3998
3999 if (hashmap_isempty(h))
4000 return;
4001
4002 fputs(prefix, f);
4003 HASHMAP_FOREACH(link, h, i) {
4004 if (space)
4005 fputc(' ', f);
4006
4007 fprintf(f, "%i", link->ifindex);
4008 space = true;
4009 }
4010
4011 fputc('\n', f);
4012 }
4013
4014 int link_save(Link *link) {
4015 _cleanup_free_ char *temp_path = NULL;
4016 _cleanup_fclose_ FILE *f = NULL;
4017 const char *admin_state, *oper_state;
4018 Address *a;
4019 Route *route;
4020 Iterator i;
4021 int r;
4022
4023 assert(link);
4024 assert(link->state_file);
4025 assert(link->lease_file);
4026 assert(link->manager);
4027
4028 if (link->state == LINK_STATE_LINGER) {
4029 (void) unlink(link->state_file);
4030 return 0;
4031 }
4032
4033 link_lldp_save(link);
4034
4035 admin_state = link_state_to_string(link->state);
4036 assert(admin_state);
4037
4038 oper_state = link_operstate_to_string(link->operstate);
4039 assert(oper_state);
4040
4041 r = fopen_temporary(link->state_file, &f, &temp_path);
4042 if (r < 0)
4043 goto fail;
4044
4045 (void) fchmod(fileno(f), 0644);
4046
4047 fprintf(f,
4048 "# This is private data. Do not parse.\n"
4049 "ADMIN_STATE=%s\n"
4050 "OPER_STATE=%s\n",
4051 admin_state, oper_state);
4052
4053 if (link->network) {
4054 bool space;
4055 sd_dhcp6_lease *dhcp6_lease = NULL;
4056 const char *dhcp_domainname = NULL;
4057 char **dhcp6_domains = NULL;
4058 char **dhcp_domains = NULL;
4059 unsigned j;
4060
4061 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4062 yes_no(link->network->required_for_online));
4063
4064 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
4065 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
4066
4067 if (link->dhcp6_client) {
4068 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
4069 if (r < 0 && r != -ENOMSG)
4070 log_link_debug(link, "No DHCPv6 lease");
4071 }
4072
4073 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4074
4075 fputs("DNS=", f);
4076 space = false;
4077
4078 for (j = 0; j < link->network->n_dns; j++) {
4079 _cleanup_free_ char *b = NULL;
4080
4081 r = in_addr_to_string(link->network->dns[j].family,
4082 &link->network->dns[j].address, &b);
4083 if (r < 0) {
4084 log_debug_errno(r, "Failed to format address, ignoring: %m");
4085 continue;
4086 }
4087
4088 if (space)
4089 fputc(' ', f);
4090 fputs(b, f);
4091 space = true;
4092 }
4093
4094 if (link->network->dhcp_use_dns &&
4095 link->dhcp_lease) {
4096 const struct in_addr *addresses;
4097
4098 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
4099 if (r > 0)
4100 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4101 space = true;
4102 }
4103
4104 if (link->network->dhcp_use_dns && dhcp6_lease) {
4105 struct in6_addr *in6_addrs;
4106
4107 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
4108 if (r > 0) {
4109 if (space)
4110 fputc(' ', f);
4111 serialize_in6_addrs(f, in6_addrs, r);
4112 space = true;
4113 }
4114 }
4115
4116 /* Make sure to flush out old entries before we use the NDISC data */
4117 ndisc_vacuum(link);
4118
4119 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4120 NDiscRDNSS *dd;
4121
4122 SET_FOREACH(dd, link->ndisc_rdnss, i) {
4123 if (space)
4124 fputc(' ', f);
4125
4126 serialize_in6_addrs(f, &dd->address, 1);
4127 space = true;
4128 }
4129 }
4130
4131 fputc('\n', f);
4132
4133 fputs("NTP=", f);
4134 space = false;
4135 fputstrv(f, link->network->ntp, NULL, &space);
4136
4137 if (link->network->dhcp_use_ntp &&
4138 link->dhcp_lease) {
4139 const struct in_addr *addresses;
4140
4141 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
4142 if (r > 0)
4143 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4144 space = true;
4145 }
4146
4147 if (link->network->dhcp_use_ntp && dhcp6_lease) {
4148 struct in6_addr *in6_addrs;
4149 char **hosts;
4150
4151 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
4152 &in6_addrs);
4153 if (r > 0) {
4154 if (space)
4155 fputc(' ', f);
4156 serialize_in6_addrs(f, in6_addrs, r);
4157 space = true;
4158 }
4159
4160 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
4161 if (r > 0)
4162 fputstrv(f, hosts, NULL, &space);
4163 }
4164
4165 fputc('\n', f);
4166
4167 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4168 if (link->dhcp_lease) {
4169 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4170 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4171 }
4172 if (dhcp6_lease)
4173 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4174 }
4175
4176 ordered_set_print(f, "DOMAINS=", link->network->search_domains);
4177
4178 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4179 NDiscDNSSL *dd;
4180
4181 if (dhcp_domainname)
4182 fputs_with_space(f, dhcp_domainname, NULL, &space);
4183 if (dhcp_domains)
4184 fputstrv(f, dhcp_domains, NULL, &space);
4185 if (dhcp6_domains)
4186 fputstrv(f, dhcp6_domains, NULL, &space);
4187
4188 SET_FOREACH(dd, link->ndisc_dnssl, i)
4189 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4190 }
4191
4192 fputc('\n', f);
4193
4194 ordered_set_print(f, "ROUTE_DOMAINS=", link->network->route_domains);
4195
4196 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4197 NDiscDNSSL *dd;
4198
4199 if (dhcp_domainname)
4200 fputs_with_space(f, dhcp_domainname, NULL, &space);
4201 if (dhcp_domains)
4202 fputstrv(f, dhcp_domains, NULL, &space);
4203 if (dhcp6_domains)
4204 fputstrv(f, dhcp6_domains, NULL, &space);
4205
4206 SET_FOREACH(dd, link->ndisc_dnssl, i)
4207 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4208 }
4209
4210 fputc('\n', f);
4211
4212 fprintf(f, "LLMNR=%s\n",
4213 resolve_support_to_string(link->network->llmnr));
4214 fprintf(f, "MDNS=%s\n",
4215 resolve_support_to_string(link->network->mdns));
4216 if (link->network->dns_default_route >= 0)
4217 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
4218
4219 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4220 fprintf(f, "DNS_OVER_TLS=%s\n",
4221 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
4222
4223 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
4224 fprintf(f, "DNSSEC=%s\n",
4225 dnssec_mode_to_string(link->network->dnssec_mode));
4226
4227 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
4228 const char *n;
4229
4230 fputs("DNSSEC_NTA=", f);
4231 space = false;
4232 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
4233 fputs_with_space(f, n, NULL, &space);
4234 fputc('\n', f);
4235 }
4236
4237 fputs("ADDRESSES=", f);
4238 space = false;
4239 SET_FOREACH(a, link->addresses, i) {
4240 _cleanup_free_ char *address_str = NULL;
4241
4242 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4243 if (r < 0)
4244 goto fail;
4245
4246 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4247 space = true;
4248 }
4249 fputc('\n', f);
4250
4251 fputs("ROUTES=", f);
4252 space = false;
4253 SET_FOREACH(route, link->routes, i) {
4254 _cleanup_free_ char *route_str = NULL;
4255
4256 r = in_addr_to_string(route->family, &route->dst, &route_str);
4257 if (r < 0)
4258 goto fail;
4259
4260 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4261 space ? " " : "", route_str,
4262 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4263 space = true;
4264 }
4265
4266 fputc('\n', f);
4267 }
4268
4269 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4270 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4271
4272 if (link->dhcp_lease) {
4273 struct in_addr address;
4274 const char *tz = NULL;
4275
4276 assert(link->network);
4277
4278 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
4279 if (r >= 0)
4280 fprintf(f, "TIMEZONE=%s\n", tz);
4281
4282 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
4283 if (r >= 0) {
4284 fputs("DHCP4_ADDRESS=", f);
4285 serialize_in_addrs(f, &address, 1, false, NULL);
4286 fputc('\n', f);
4287 }
4288
4289 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4290 if (r < 0)
4291 goto fail;
4292
4293 fprintf(f,
4294 "DHCP_LEASE=%s\n",
4295 link->lease_file);
4296 } else
4297 (void) unlink(link->lease_file);
4298
4299 if (link->ipv4ll) {
4300 struct in_addr address;
4301
4302 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4303 if (r >= 0) {
4304 fputs("IPV4LL_ADDRESS=", f);
4305 serialize_in_addrs(f, &address, 1, false, NULL);
4306 fputc('\n', f);
4307 }
4308 }
4309
4310 r = fflush_and_check(f);
4311 if (r < 0)
4312 goto fail;
4313
4314 if (rename(temp_path, link->state_file) < 0) {
4315 r = -errno;
4316 goto fail;
4317 }
4318
4319 return 0;
4320
4321 fail:
4322 (void) unlink(link->state_file);
4323 if (temp_path)
4324 (void) unlink(temp_path);
4325
4326 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4327 }
4328
4329 /* The serialized state in /run is no longer up-to-date. */
4330 void link_dirty(Link *link) {
4331 int r;
4332
4333 assert(link);
4334
4335 /* mark manager dirty as link is dirty */
4336 manager_dirty(link->manager);
4337
4338 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
4339 if (r < 0)
4340 /* allocation errors are ignored */
4341 return;
4342
4343 r = set_put(link->manager->dirty_links, link);
4344 if (r <= 0)
4345 /* don't take another ref if the link was already dirty */
4346 return;
4347
4348 link_ref(link);
4349 }
4350
4351 /* The serialized state in /run is up-to-date */
4352 void link_clean(Link *link) {
4353 assert(link);
4354 assert(link->manager);
4355
4356 link_unref(set_remove(link->manager->dirty_links, link));
4357 }
4358
4359 static const char* const link_state_table[_LINK_STATE_MAX] = {
4360 [LINK_STATE_PENDING] = "pending",
4361 [LINK_STATE_INITIALIZED] = "initialized",
4362 [LINK_STATE_CONFIGURING] = "configuring",
4363 [LINK_STATE_CONFIGURED] = "configured",
4364 [LINK_STATE_UNMANAGED] = "unmanaged",
4365 [LINK_STATE_FAILED] = "failed",
4366 [LINK_STATE_LINGER] = "linger",
4367 };
4368
4369 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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