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