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