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network: make bond master follow operstates of slaves
[thirdparty/systemd.git] / src / network / networkd-link.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <netinet/ether.h>
4 #include <linux/if.h>
5 #include <linux/can/netlink.h>
6 #include <unistd.h>
7 #include <stdio_ext.h>
8
9 #include "alloc-util.h"
10 #include "bus-util.h"
11 #include "dhcp-identifier.h"
12 #include "dhcp-lease-internal.h"
13 #include "env-file.h"
14 #include "fd-util.h"
15 #include "fileio.h"
16 #include "missing_network.h"
17 #include "netlink-util.h"
18 #include "network-internal.h"
19 #include "networkd-ipv6-proxy-ndp.h"
20 #include "networkd-lldp-tx.h"
21 #include "networkd-manager.h"
22 #include "networkd-ndisc.h"
23 #include "networkd-neighbor.h"
24 #include "networkd-radv.h"
25 #include "networkd-routing-policy-rule.h"
26 #include "set.h"
27 #include "socket-util.h"
28 #include "stdio-util.h"
29 #include "string-table.h"
30 #include "strv.h"
31 #include "tmpfile-util.h"
32 #include "util.h"
33 #include "virt.h"
34
35 DUID* link_get_duid(Link *link) {
36 if (link->network->duid.type != _DUID_TYPE_INVALID)
37 return &link->network->duid;
38 else
39 return &link->manager->duid;
40 }
41
42 static bool link_dhcp6_enabled(Link *link) {
43 assert(link);
44
45 if (!socket_ipv6_is_supported())
46 return false;
47
48 if (link->flags & IFF_LOOPBACK)
49 return false;
50
51 if (!link->network)
52 return false;
53
54 if (link->network->bond)
55 return false;
56
57 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
58 }
59
60 static bool link_dhcp4_enabled(Link *link) {
61 assert(link);
62
63 if (link->flags & IFF_LOOPBACK)
64 return false;
65
66 if (!link->network)
67 return false;
68
69 if (link->network->bond)
70 return false;
71
72 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
73 }
74
75 static bool link_dhcp4_server_enabled(Link *link) {
76 assert(link);
77
78 if (link->flags & IFF_LOOPBACK)
79 return false;
80
81 if (!link->network)
82 return false;
83
84 if (link->network->bond)
85 return false;
86
87 return link->network->dhcp_server;
88 }
89
90 static bool link_ipv4ll_enabled(Link *link) {
91 assert(link);
92
93 if (link->flags & IFF_LOOPBACK)
94 return false;
95
96 if (!link->network)
97 return false;
98
99 if (streq_ptr(link->kind, "wireguard"))
100 return false;
101
102 if (link->network->bond)
103 return false;
104
105 return link->network->link_local & ADDRESS_FAMILY_IPV4;
106 }
107
108 static bool link_ipv6ll_enabled(Link *link) {
109 assert(link);
110
111 if (!socket_ipv6_is_supported())
112 return false;
113
114 if (link->flags & IFF_LOOPBACK)
115 return false;
116
117 if (!link->network)
118 return false;
119
120 if (streq_ptr(link->kind, "wireguard"))
121 return false;
122
123 if (link->network->bond)
124 return false;
125
126 return link->network->link_local & ADDRESS_FAMILY_IPV6;
127 }
128
129 static bool link_ipv6_enabled(Link *link) {
130 assert(link);
131
132 if (!socket_ipv6_is_supported())
133 return false;
134
135 if (link->network->bridge || link->network->bond)
136 return false;
137
138 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
139 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
140 }
141
142 static bool link_radv_enabled(Link *link) {
143 assert(link);
144
145 if (!link_ipv6ll_enabled(link))
146 return false;
147
148 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
149 }
150
151 static bool link_lldp_rx_enabled(Link *link) {
152 assert(link);
153
154 if (link->flags & IFF_LOOPBACK)
155 return false;
156
157 if (link->iftype != ARPHRD_ETHER)
158 return false;
159
160 if (!link->network)
161 return false;
162
163 /* LLDP should be handled on bridge slaves as those have a direct
164 * connection to their peers not on the bridge master. Linux doesn't
165 * even (by default) forward lldp packets to the bridge master.*/
166 if (streq_ptr("bridge", link->kind))
167 return false;
168
169 return link->network->lldp_mode != LLDP_MODE_NO;
170 }
171
172 static bool link_lldp_emit_enabled(Link *link) {
173 assert(link);
174
175 if (link->flags & IFF_LOOPBACK)
176 return false;
177
178 if (link->iftype != ARPHRD_ETHER)
179 return false;
180
181 if (!link->network)
182 return false;
183
184 return link->network->lldp_emit != LLDP_EMIT_NO;
185 }
186
187 static bool link_ipv4_forward_enabled(Link *link) {
188 assert(link);
189
190 if (link->flags & IFF_LOOPBACK)
191 return false;
192
193 if (!link->network)
194 return false;
195
196 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
197 return false;
198
199 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
200 }
201
202 static bool link_ipv6_forward_enabled(Link *link) {
203 assert(link);
204
205 if (!socket_ipv6_is_supported())
206 return false;
207
208 if (link->flags & IFF_LOOPBACK)
209 return false;
210
211 if (!link->network)
212 return false;
213
214 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
215 return false;
216
217 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
218 }
219
220 static bool link_proxy_arp_enabled(Link *link) {
221 assert(link);
222
223 if (link->flags & IFF_LOOPBACK)
224 return false;
225
226 if (!link->network)
227 return false;
228
229 if (link->network->proxy_arp < 0)
230 return false;
231
232 return true;
233 }
234
235 static bool link_ipv6_accept_ra_enabled(Link *link) {
236 assert(link);
237
238 if (!socket_ipv6_is_supported())
239 return false;
240
241 if (link->flags & IFF_LOOPBACK)
242 return false;
243
244 if (!link->network)
245 return false;
246
247 if (!link_ipv6ll_enabled(link))
248 return false;
249
250 /* If unset use system default (enabled if local forwarding is disabled.
251 * disabled if local forwarding is enabled).
252 * If set, ignore or enforce RA independent of local forwarding state.
253 */
254 if (link->network->ipv6_accept_ra < 0)
255 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
256 return !link_ipv6_forward_enabled(link);
257 else if (link->network->ipv6_accept_ra > 0)
258 /* accept RA even if ip_forward is enabled */
259 return true;
260 else
261 /* ignore RA */
262 return false;
263 }
264
265 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
266 assert(link);
267
268 if (!socket_ipv6_is_supported())
269 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
270
271 if (link->flags & IFF_LOOPBACK)
272 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
273
274 if (!link->network)
275 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
276
277 return link->network->ipv6_privacy_extensions;
278 }
279
280 static int link_enable_ipv6(Link *link) {
281 const char *p = NULL;
282 bool disabled;
283 int r;
284
285 if (link->flags & IFF_LOOPBACK)
286 return 0;
287
288 disabled = !link_ipv6_enabled(link);
289
290 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/disable_ipv6");
291
292 r = write_string_file(p, one_zero(disabled), WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
293 if (r < 0)
294 log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m",
295 enable_disable(!disabled), link->ifname);
296 else
297 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
298
299 return 0;
300 }
301
302 void link_update_operstate(Link *link, bool also_update_bond_master) {
303 LinkOperationalState operstate;
304
305 assert(link);
306
307 if (link->kernel_operstate == IF_OPER_DORMANT)
308 operstate = LINK_OPERSTATE_DORMANT;
309 else if (link_has_carrier(link)) {
310 Address *address;
311 uint8_t scope = RT_SCOPE_NOWHERE;
312 Iterator i;
313
314 /* if we have carrier, check what addresses we have */
315 SET_FOREACH(address, link->addresses, i) {
316 if (!address_is_ready(address))
317 continue;
318
319 if (address->scope < scope)
320 scope = address->scope;
321 }
322
323 /* for operstate we also take foreign addresses into account */
324 SET_FOREACH(address, link->addresses_foreign, i) {
325 if (!address_is_ready(address))
326 continue;
327
328 if (address->scope < scope)
329 scope = address->scope;
330 }
331
332 if (scope < RT_SCOPE_SITE)
333 /* universally accessible addresses found */
334 operstate = LINK_OPERSTATE_ROUTABLE;
335 else if (scope < RT_SCOPE_HOST)
336 /* only link or site local addresses found */
337 operstate = LINK_OPERSTATE_DEGRADED;
338 else
339 /* no useful addresses found */
340 operstate = LINK_OPERSTATE_CARRIER;
341 } else if (link->flags & IFF_UP)
342 operstate = LINK_OPERSTATE_NO_CARRIER;
343 else
344 operstate = LINK_OPERSTATE_OFF;
345
346 if (IN_SET(operstate, LINK_OPERSTATE_DEGRADED, LINK_OPERSTATE_CARRIER) &&
347 link->flags & IFF_SLAVE)
348 operstate = LINK_OPERSTATE_ENSLAVED;
349
350 if (IN_SET(operstate, LINK_OPERSTATE_CARRIER, LINK_OPERSTATE_ENSLAVED, LINK_OPERSTATE_ROUTABLE) &&
351 !hashmap_isempty(link->bond_slaves)) {
352 Iterator i;
353 Link *slave;
354
355 HASHMAP_FOREACH(slave, link->bond_slaves, i) {
356 link_update_operstate(slave, false);
357
358 if (IN_SET(slave->operstate,
359 LINK_OPERSTATE_OFF, LINK_OPERSTATE_NO_CARRIER, LINK_OPERSTATE_DORMANT))
360 operstate = LINK_OPERSTATE_DEGRADED;
361 }
362 }
363
364 if (link->operstate != operstate) {
365 link->operstate = operstate;
366 link_send_changed(link, "OperationalState", NULL);
367 link_dirty(link);
368 }
369
370 if (also_update_bond_master && link->network && link->network->bond) {
371 Link *master;
372
373 if (link_get(link->manager, link->network->bond->ifindex, &master) < 0)
374 return;
375
376 link_update_operstate(master, true);
377 }
378 }
379
380 #define FLAG_STRING(string, flag, old, new) \
381 (((old ^ new) & flag) \
382 ? ((old & flag) ? (" -" string) : (" +" string)) \
383 : "")
384
385 static int link_update_flags(Link *link, sd_netlink_message *m) {
386 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
387 uint8_t operstate;
388 int r;
389
390 assert(link);
391
392 r = sd_rtnl_message_link_get_flags(m, &flags);
393 if (r < 0)
394 return log_link_warning_errno(link, r, "Could not get link flags: %m");
395
396 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
397 if (r < 0)
398 /* if we got a message without operstate, take it to mean
399 the state was unchanged */
400 operstate = link->kernel_operstate;
401
402 if ((link->flags == flags) && (link->kernel_operstate == operstate))
403 return 0;
404
405 if (link->flags != flags) {
406 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",
407 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
408 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
409 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
410 FLAG_STRING("UP", IFF_UP, link->flags, flags),
411 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
412 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
413 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
414 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
415 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
416 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
417 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
418 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
419 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
420 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
421 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
422 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
423 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
424 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
425 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
426
427 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
428 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
429 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
430 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
431 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
432 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
433 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
434 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
435
436 /* link flags are currently at most 18 bits, let's align to
437 * printing 20 */
438 if (unknown_flags_added)
439 log_link_debug(link,
440 "Unknown link flags gained: %#.5x (ignoring)",
441 unknown_flags_added);
442
443 if (unknown_flags_removed)
444 log_link_debug(link,
445 "Unknown link flags lost: %#.5x (ignoring)",
446 unknown_flags_removed);
447 }
448
449 link->flags = flags;
450 link->kernel_operstate = operstate;
451
452 link_update_operstate(link, true);
453
454 return 0;
455 }
456
457 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_unref);
458
459 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
460 _cleanup_(link_unrefp) Link *link = NULL;
461 uint16_t type;
462 const char *ifname, *kind = NULL;
463 int r, ifindex;
464 unsigned short iftype;
465
466 assert(manager);
467 assert(message);
468 assert(ret);
469
470 /* check for link kind */
471 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
472 if (r == 0) {
473 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
474 r = sd_netlink_message_exit_container(message);
475 if (r < 0)
476 return r;
477 }
478
479 r = sd_netlink_message_get_type(message, &type);
480 if (r < 0)
481 return r;
482 else if (type != RTM_NEWLINK)
483 return -EINVAL;
484
485 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
486 if (r < 0)
487 return r;
488 else if (ifindex <= 0)
489 return -EINVAL;
490
491 r = sd_rtnl_message_link_get_type(message, &iftype);
492 if (r < 0)
493 return r;
494
495 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
496 if (r < 0)
497 return r;
498
499 link = new(Link, 1);
500 if (!link)
501 return -ENOMEM;
502
503 *link = (Link) {
504 .n_ref = 1,
505 .manager = manager,
506 .state = LINK_STATE_PENDING,
507 .rtnl_extended_attrs = true,
508 .ifindex = ifindex,
509 .iftype = iftype,
510 };
511
512 link->ifname = strdup(ifname);
513 if (!link->ifname)
514 return -ENOMEM;
515
516 if (kind) {
517 link->kind = strdup(kind);
518 if (!link->kind)
519 return -ENOMEM;
520 }
521
522 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
523 if (r < 0)
524 log_link_debug_errno(link, r, "New device has no master, continuing without");
525
526 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
527 if (r < 0)
528 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
529
530 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
531 return -ENOMEM;
532
533 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
534 return -ENOMEM;
535
536 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
537 return -ENOMEM;
538
539 r = hashmap_ensure_allocated(&manager->links, NULL);
540 if (r < 0)
541 return r;
542
543 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
544 if (r < 0)
545 return r;
546
547 r = link_update_flags(link, message);
548 if (r < 0)
549 return r;
550
551 *ret = TAKE_PTR(link);
552
553 return 0;
554 }
555
556 static void link_detach_from_manager(Link *link) {
557 if (!link || !link->manager)
558 return;
559
560 hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex));
561 set_remove(link->manager->links_requesting_uuid, link);
562 link_clean(link);
563 }
564
565 static Link *link_free(Link *link) {
566 Address *address;
567 Link *carrier;
568 Route *route;
569 Iterator i;
570
571 assert(link);
572
573 while ((route = set_first(link->routes)))
574 route_free(route);
575
576 while ((route = set_first(link->routes_foreign)))
577 route_free(route);
578
579 link->routes = set_free(link->routes);
580 link->routes_foreign = set_free(link->routes_foreign);
581
582 while ((address = set_first(link->addresses)))
583 address_free(address);
584
585 while ((address = set_first(link->addresses_foreign)))
586 address_free(address);
587
588 link->addresses = set_free(link->addresses);
589 link->addresses_foreign = set_free(link->addresses_foreign);
590
591 while ((address = link->pool_addresses)) {
592 LIST_REMOVE(addresses, link->pool_addresses, address);
593 address_free(address);
594 }
595
596 sd_dhcp_server_unref(link->dhcp_server);
597 sd_dhcp_client_unref(link->dhcp_client);
598 sd_dhcp_lease_unref(link->dhcp_lease);
599
600 link_lldp_emit_stop(link);
601
602 free(link->lease_file);
603
604 sd_lldp_unref(link->lldp);
605 free(link->lldp_file);
606
607 ndisc_flush(link);
608
609 sd_ipv4ll_unref(link->ipv4ll);
610 sd_dhcp6_client_unref(link->dhcp6_client);
611 sd_ndisc_unref(link->ndisc);
612 sd_radv_unref(link->radv);
613
614 link_detach_from_manager(link);
615
616 free(link->ifname);
617
618 free(link->kind);
619
620 (void) unlink(link->state_file);
621 free(link->state_file);
622
623 sd_device_unref(link->sd_device);
624
625 HASHMAP_FOREACH (carrier, link->bound_to_links, i)
626 hashmap_remove(link->bound_to_links, INT_TO_PTR(carrier->ifindex));
627 hashmap_free(link->bound_to_links);
628
629 HASHMAP_FOREACH (carrier, link->bound_by_links, i)
630 hashmap_remove(link->bound_by_links, INT_TO_PTR(carrier->ifindex));
631 hashmap_free(link->bound_by_links);
632
633 hashmap_free(link->bond_slaves);
634
635 return mfree(link);
636 }
637
638 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
639
640 int link_get(Manager *m, int ifindex, Link **ret) {
641 Link *link;
642
643 assert(m);
644 assert(ifindex);
645 assert(ret);
646
647 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
648 if (!link)
649 return -ENODEV;
650
651 *ret = link;
652
653 return 0;
654 }
655
656 static void link_set_state(Link *link, LinkState state) {
657 assert(link);
658
659 if (link->state == state)
660 return;
661
662 link->state = state;
663
664 link_send_changed(link, "AdministrativeState", NULL);
665 }
666
667 static void link_enter_unmanaged(Link *link) {
668 assert(link);
669
670 log_link_debug(link, "Unmanaged");
671
672 link_set_state(link, LINK_STATE_UNMANAGED);
673
674 link_dirty(link);
675 }
676
677 static int link_stop_clients(Link *link) {
678 int r = 0, k;
679
680 assert(link);
681 assert(link->manager);
682 assert(link->manager->event);
683
684 if (link->dhcp_client) {
685 k = sd_dhcp_client_stop(link->dhcp_client);
686 if (k < 0)
687 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
688 }
689
690 if (link->ipv4ll) {
691 k = sd_ipv4ll_stop(link->ipv4ll);
692 if (k < 0)
693 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
694 }
695
696 if (link->dhcp6_client) {
697 k = sd_dhcp6_client_stop(link->dhcp6_client);
698 if (k < 0)
699 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
700 }
701
702 if (link->ndisc) {
703 k = sd_ndisc_stop(link->ndisc);
704 if (k < 0)
705 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
706 }
707
708 if (link->radv) {
709 k = sd_radv_stop(link->radv);
710 if (k < 0)
711 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
712 }
713
714 link_lldp_emit_stop(link);
715 return r;
716 }
717
718 void link_enter_failed(Link *link) {
719 assert(link);
720
721 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
722 return;
723
724 log_link_warning(link, "Failed");
725
726 link_set_state(link, LINK_STATE_FAILED);
727
728 link_stop_clients(link);
729
730 link_dirty(link);
731 }
732
733 static Address* link_find_dhcp_server_address(Link *link) {
734 Address *address;
735
736 assert(link);
737 assert(link->network);
738
739 /* The first statically configured address if there is any */
740 LIST_FOREACH(addresses, address, link->network->static_addresses) {
741
742 if (address->family != AF_INET)
743 continue;
744
745 if (in_addr_is_null(address->family, &address->in_addr))
746 continue;
747
748 return address;
749 }
750
751 /* If that didn't work, find a suitable address we got from the pool */
752 LIST_FOREACH(addresses, address, link->pool_addresses) {
753 if (address->family != AF_INET)
754 continue;
755
756 return address;
757 }
758
759 return NULL;
760 }
761
762 static void link_enter_configured(Link *link) {
763 assert(link);
764 assert(link->network);
765
766 if (link->state != LINK_STATE_CONFIGURING)
767 return;
768
769 log_link_info(link, "Configured");
770
771 link_set_state(link, LINK_STATE_CONFIGURED);
772
773 link_dirty(link);
774 }
775
776 static int link_request_set_routing_policy_rule(Link *link) {
777 RoutingPolicyRule *rule, *rrule = NULL;
778 int r;
779
780 assert(link);
781 assert(link->network);
782
783 link_set_state(link, LINK_STATE_CONFIGURING);
784 link->routing_policy_rules_configured = false;
785
786 LIST_FOREACH(rules, rule, link->network->rules) {
787 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
788 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif,
789 rule->protocol, &rule->sport, &rule->dport, &rrule);
790 if (r == 0) {
791 (void) routing_policy_rule_make_local(link->manager, rrule);
792 continue;
793 }
794
795 r = routing_policy_rule_configure(rule, link, NULL, false);
796 if (r < 0) {
797 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
798 link_enter_failed(link);
799 return r;
800 }
801
802 link->routing_policy_rule_messages++;
803 }
804
805 routing_policy_rule_purge(link->manager, link);
806 if (link->routing_policy_rule_messages == 0) {
807 link->routing_policy_rules_configured = true;
808 link_check_ready(link);
809 } else
810 log_link_debug(link, "Setting routing policy rules");
811
812 return 0;
813 }
814
815 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
816 int r;
817
818 assert(link);
819 assert(link->route_messages > 0);
820 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
821 LINK_STATE_FAILED, LINK_STATE_LINGER));
822
823 link->route_messages--;
824
825 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
826 return 1;
827
828 r = sd_netlink_message_get_errno(m);
829 if (r < 0 && r != -EEXIST)
830 log_link_warning_errno(link, r, "Could not set route: %m");
831
832 if (link->route_messages == 0) {
833 log_link_debug(link, "Routes set");
834 link->static_routes_configured = true;
835 link_check_ready(link);
836 }
837
838 return 1;
839 }
840
841 static int link_request_set_routes(Link *link) {
842 enum {
843 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
844 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
845 _PHASE_MAX
846 } phase;
847 Route *rt;
848 int r;
849
850 assert(link);
851 assert(link->network);
852 assert(link->addresses_configured);
853 assert(link->address_messages == 0);
854 assert(link->state != _LINK_STATE_INVALID);
855
856 link_set_state(link, LINK_STATE_CONFIGURING);
857 link->static_routes_configured = false;
858
859 r = link_request_set_routing_policy_rule(link);
860 if (r < 0)
861 return r;
862
863 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
864 for (phase = 0; phase < _PHASE_MAX; phase++)
865 LIST_FOREACH(routes, rt, link->network->static_routes) {
866
867 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
868 continue;
869
870 r = route_configure(rt, link, route_handler);
871 if (r < 0) {
872 log_link_warning_errno(link, r, "Could not set routes: %m");
873 link_enter_failed(link);
874 return r;
875 }
876
877 link->route_messages++;
878 }
879
880 if (link->route_messages == 0) {
881 link->static_routes_configured = true;
882 link_check_ready(link);
883 } else
884 log_link_debug(link, "Setting routes");
885
886 return 0;
887 }
888
889 void link_check_ready(Link *link) {
890 Address *a;
891 Iterator i;
892
893 assert(link);
894
895 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
896 return;
897
898 if (!link->network)
899 return;
900
901 if (!link->addresses_configured)
902 return;
903
904 if (!link->neighbors_configured)
905 return;
906
907 SET_FOREACH(a, link->addresses, i)
908 if (!address_is_ready(a))
909 return;
910
911 if (!link->addresses_ready) {
912 link->addresses_ready = true;
913 link_request_set_routes(link);
914 }
915
916 if (!link->static_routes_configured)
917 return;
918
919 if (!link->routing_policy_rules_configured)
920 return;
921
922 if (link_ipv4ll_enabled(link))
923 if (!link->ipv4ll_address ||
924 !link->ipv4ll_route)
925 return;
926
927 if (!link->network->bridge) {
928
929 if (link_ipv6ll_enabled(link) &&
930 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
931 return;
932
933 if ((link_dhcp4_enabled(link) && !link_dhcp6_enabled(link) &&
934 !link->dhcp4_configured) ||
935 (link_dhcp6_enabled(link) && !link_dhcp4_enabled(link) &&
936 !link->dhcp6_configured) ||
937 (link_dhcp4_enabled(link) && link_dhcp6_enabled(link) &&
938 !link->dhcp4_configured && !link->dhcp6_configured))
939 return;
940
941 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
942 return;
943 }
944
945 if (link->state != LINK_STATE_CONFIGURED)
946 link_enter_configured(link);
947
948 return;
949 }
950
951 static int link_request_set_neighbors(Link *link) {
952 Neighbor *neighbor;
953 int r;
954
955 assert(link);
956 assert(link->network);
957 assert(link->state != _LINK_STATE_INVALID);
958
959 link_set_state(link, LINK_STATE_CONFIGURING);
960 link->neighbors_configured = false;
961
962 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
963 r = neighbor_configure(neighbor, link, NULL);
964 if (r < 0) {
965 log_link_warning_errno(link, r, "Could not set neighbor: %m");
966 link_enter_failed(link);
967 return r;
968 }
969 }
970
971 if (link->neighbor_messages == 0) {
972 link->neighbors_configured = true;
973 link_check_ready(link);
974 } else
975 log_link_debug(link, "Setting neighbors");
976
977 return 0;
978 }
979
980 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
981 int r;
982
983 assert(rtnl);
984 assert(m);
985 assert(link);
986 assert(link->ifname);
987 assert(link->address_messages > 0);
988 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
989 LINK_STATE_FAILED, LINK_STATE_LINGER));
990
991 link->address_messages--;
992
993 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
994 return 1;
995
996 r = sd_netlink_message_get_errno(m);
997 if (r < 0 && r != -EEXIST)
998 log_link_warning_errno(link, r, "could not set address: %m");
999 else if (r >= 0)
1000 manager_rtnl_process_address(rtnl, m, link->manager);
1001
1002 if (link->address_messages == 0) {
1003 log_link_debug(link, "Addresses set");
1004 link->addresses_configured = true;
1005 link_check_ready(link);
1006 }
1007
1008 return 1;
1009 }
1010
1011 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1012 _cleanup_free_ struct in_addr *addresses = NULL;
1013 size_t n_addresses = 0, n_allocated = 0;
1014 unsigned i;
1015
1016 log_debug("Copying DNS server information from %s", link->ifname);
1017
1018 if (!link->network)
1019 return 0;
1020
1021 for (i = 0; i < link->network->n_dns; i++) {
1022 struct in_addr ia;
1023
1024 /* Only look for IPv4 addresses */
1025 if (link->network->dns[i].family != AF_INET)
1026 continue;
1027
1028 ia = link->network->dns[i].address.in;
1029
1030 /* Never propagate obviously borked data */
1031 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1032 continue;
1033
1034 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1035 return log_oom();
1036
1037 addresses[n_addresses++] = ia;
1038 }
1039
1040 if (link->network->dhcp_use_dns && link->dhcp_lease) {
1041 const struct in_addr *da = NULL;
1042 int n;
1043
1044 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
1045 if (n > 0) {
1046
1047 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1048 return log_oom();
1049
1050 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
1051 n_addresses += n;
1052 }
1053 }
1054
1055 if (n_addresses <= 0)
1056 return 0;
1057
1058 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
1059 }
1060
1061 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1062 _cleanup_free_ struct in_addr *addresses = NULL;
1063 size_t n_addresses = 0, n_allocated = 0;
1064 char **a;
1065
1066 if (!link->network)
1067 return 0;
1068
1069 log_debug("Copying NTP server information from %s", link->ifname);
1070
1071 STRV_FOREACH(a, link->network->ntp) {
1072 struct in_addr ia;
1073
1074 /* Only look for IPv4 addresses */
1075 if (inet_pton(AF_INET, *a, &ia) <= 0)
1076 continue;
1077
1078 /* Never propagate obviously borked data */
1079 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1080 continue;
1081
1082 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1083 return log_oom();
1084
1085 addresses[n_addresses++] = ia;
1086 }
1087
1088 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1089 const struct in_addr *da = NULL;
1090 int n;
1091
1092 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1093 if (n > 0) {
1094
1095 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1096 return log_oom();
1097
1098 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
1099 n_addresses += n;
1100 }
1101 }
1102
1103 if (n_addresses <= 0)
1104 return 0;
1105
1106 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1107 }
1108
1109 static int link_set_bridge_fdb(Link *link) {
1110 FdbEntry *fdb_entry;
1111 int r;
1112
1113 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1114 r = fdb_entry_configure(link, fdb_entry);
1115 if (r < 0)
1116 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1117 }
1118
1119 return 0;
1120 }
1121
1122 static int link_request_set_addresses(Link *link) {
1123 AddressLabel *label;
1124 Address *ad;
1125 int r;
1126
1127 assert(link);
1128 assert(link->network);
1129 assert(link->state != _LINK_STATE_INVALID);
1130
1131 link_set_state(link, LINK_STATE_CONFIGURING);
1132
1133 /* Reset all *_configured flags we are configuring. */
1134 link->addresses_configured = false;
1135 link->addresses_ready = false;
1136 link->neighbors_configured = false;
1137 link->static_routes_configured = false;
1138 link->routing_policy_rules_configured = false;
1139
1140 r = link_set_bridge_fdb(link);
1141 if (r < 0)
1142 return r;
1143
1144 r = link_request_set_neighbors(link);
1145 if (r < 0)
1146 return r;
1147
1148 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1149 bool update;
1150
1151 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1152
1153 r = address_configure(ad, link, address_handler, update);
1154 if (r < 0) {
1155 log_link_warning_errno(link, r, "Could not set addresses: %m");
1156 link_enter_failed(link);
1157 return r;
1158 }
1159
1160 link->address_messages++;
1161 }
1162
1163 LIST_FOREACH(labels, label, link->network->address_labels) {
1164 r = address_label_configure(label, link, NULL, false);
1165 if (r < 0) {
1166 log_link_warning_errno(link, r, "Could not set address label: %m");
1167 link_enter_failed(link);
1168 return r;
1169 }
1170
1171 link->address_label_messages++;
1172 }
1173
1174 /* now that we can figure out a default address for the dhcp server,
1175 start it */
1176 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1177 Address *address;
1178 Link *uplink = NULL;
1179 bool acquired_uplink = false;
1180
1181 address = link_find_dhcp_server_address(link);
1182 if (!address) {
1183 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1184 link_enter_failed(link);
1185 return 0;
1186 }
1187
1188 /* use the server address' subnet as the pool */
1189 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1190 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1191 if (r < 0)
1192 return r;
1193
1194 /* TODO:
1195 r = sd_dhcp_server_set_router(link->dhcp_server,
1196 &main_address->in_addr.in);
1197 if (r < 0)
1198 return r;
1199 */
1200
1201 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1202 r = sd_dhcp_server_set_max_lease_time(
1203 link->dhcp_server,
1204 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1205 if (r < 0)
1206 return r;
1207 }
1208
1209 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1210 r = sd_dhcp_server_set_default_lease_time(
1211 link->dhcp_server,
1212 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1213 if (r < 0)
1214 return r;
1215 }
1216
1217 if (link->network->dhcp_server_emit_dns) {
1218
1219 if (link->network->n_dhcp_server_dns > 0)
1220 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1221 else {
1222 uplink = manager_find_uplink(link->manager, link);
1223 acquired_uplink = true;
1224
1225 if (!uplink) {
1226 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1227 r = 0;
1228 } else
1229 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1230 }
1231 if (r < 0)
1232 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1233 }
1234
1235 if (link->network->dhcp_server_emit_ntp) {
1236
1237 if (link->network->n_dhcp_server_ntp > 0)
1238 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1239 else {
1240 if (!acquired_uplink)
1241 uplink = manager_find_uplink(link->manager, link);
1242
1243 if (!uplink) {
1244 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1245 r = 0;
1246 } else
1247 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1248
1249 }
1250 if (r < 0)
1251 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1252 }
1253
1254 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1255 if (r < 0)
1256 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1257
1258 if (link->network->dhcp_server_emit_timezone) {
1259 _cleanup_free_ char *buffer = NULL;
1260 const char *tz = NULL;
1261
1262 if (link->network->dhcp_server_timezone)
1263 tz = link->network->dhcp_server_timezone;
1264 else {
1265 r = get_timezone(&buffer);
1266 if (r < 0)
1267 log_warning_errno(r, "Failed to determine timezone: %m");
1268 else
1269 tz = buffer;
1270 }
1271
1272 if (tz) {
1273 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1274 if (r < 0)
1275 return r;
1276 }
1277 }
1278 if (!sd_dhcp_server_is_running(link->dhcp_server)) {
1279 r = sd_dhcp_server_start(link->dhcp_server);
1280 if (r < 0) {
1281 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1282
1283 link_enter_failed(link);
1284
1285 return 0;
1286 }
1287 }
1288
1289 log_link_debug(link, "Offering DHCPv4 leases");
1290 }
1291
1292 if (link->address_messages == 0) {
1293 link->addresses_configured = true;
1294 link_check_ready(link);
1295 } else
1296 log_link_debug(link, "Setting addresses");
1297
1298 return 0;
1299 }
1300
1301 static int link_set_bridge_vlan(Link *link) {
1302 int r = 0;
1303
1304 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1305 if (r < 0)
1306 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1307
1308 return r;
1309 }
1310
1311 static int link_set_proxy_arp(Link *link) {
1312 const char *p = NULL;
1313 int r;
1314
1315 if (!link_proxy_arp_enabled(link))
1316 return 0;
1317
1318 p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/proxy_arp");
1319
1320 r = write_string_file(p, one_zero(link->network->proxy_arp), WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
1321 if (r < 0)
1322 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1323
1324 return 0;
1325 }
1326
1327 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1328 int r;
1329
1330 assert(link);
1331
1332 log_link_debug(link, "Set link");
1333
1334 r = sd_netlink_message_get_errno(m);
1335 if (r < 0 && r != -EEXIST) {
1336 log_link_error_errno(link, r, "Could not join netdev: %m");
1337 link_enter_failed(link);
1338 }
1339
1340 return 1;
1341 }
1342
1343 static int link_configure_after_setting_mtu(Link *link);
1344
1345 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1346 int r;
1347
1348 assert(m);
1349 assert(link);
1350 assert(link->ifname);
1351
1352 link->setting_mtu = false;
1353
1354 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1355 return 1;
1356
1357 r = sd_netlink_message_get_errno(m);
1358 if (r < 0) {
1359 log_link_warning_errno(link, r, "Could not set MTU: %m");
1360 return 1;
1361 }
1362
1363 log_link_debug(link, "Setting MTU done.");
1364
1365 if (link->state == LINK_STATE_PENDING)
1366 (void) link_configure_after_setting_mtu(link);
1367
1368 return 1;
1369 }
1370
1371 int link_set_mtu(Link *link, uint32_t mtu) {
1372 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1373 int r;
1374
1375 assert(link);
1376 assert(link->manager);
1377 assert(link->manager->rtnl);
1378
1379 if (link->mtu == mtu || link->setting_mtu)
1380 return 0;
1381
1382 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1383
1384 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1385 if (r < 0)
1386 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1387
1388 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1389 * for this interface, or if it is a bridge slave, then disable IPv6 else enable it. */
1390 (void) link_enable_ipv6(link);
1391
1392 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1393 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1394 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1395
1396 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1397 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1398
1399 mtu = IPV6_MIN_MTU;
1400 }
1401
1402 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1403 if (r < 0)
1404 return log_link_error_errno(link, r, "Could not append MTU: %m");
1405
1406 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1407 link_netlink_destroy_callback, link);
1408 if (r < 0)
1409 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1410
1411 link_ref(link);
1412 link->setting_mtu = true;
1413
1414 return 0;
1415 }
1416
1417 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1418 int r;
1419
1420 assert(m);
1421 assert(link);
1422 assert(link->ifname);
1423
1424 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1425 return 1;
1426
1427 r = sd_netlink_message_get_errno(m);
1428 if (r < 0)
1429 log_link_warning_errno(link, r, "Could not set link flags: %m");
1430
1431 return 1;
1432 }
1433
1434 static int link_set_flags(Link *link) {
1435 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1436 unsigned ifi_change = 0;
1437 unsigned ifi_flags = 0;
1438 int r;
1439
1440 assert(link);
1441 assert(link->manager);
1442 assert(link->manager->rtnl);
1443
1444 if (link->flags & IFF_LOOPBACK)
1445 return 0;
1446
1447 if (!link->network)
1448 return 0;
1449
1450 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1451 return 0;
1452
1453 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1454 if (r < 0)
1455 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1456
1457 if (link->network->arp >= 0) {
1458 ifi_change |= IFF_NOARP;
1459 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1460 }
1461
1462 if (link->network->multicast >= 0) {
1463 ifi_change |= IFF_MULTICAST;
1464 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1465 }
1466
1467 if (link->network->allmulticast >= 0) {
1468 ifi_change |= IFF_ALLMULTI;
1469 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1470 }
1471
1472 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1473 if (r < 0)
1474 return log_link_error_errno(link, r, "Could not set link flags: %m");
1475
1476 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1477 link_netlink_destroy_callback, link);
1478 if (r < 0)
1479 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1480
1481 link_ref(link);
1482
1483 return 0;
1484 }
1485
1486 static int link_set_bridge(Link *link) {
1487 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1488 int r;
1489
1490 assert(link);
1491 assert(link->network);
1492
1493 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1494 if (r < 0)
1495 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1496
1497 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1498 if (r < 0)
1499 return log_link_error_errno(link, r, "Could not set message family: %m");
1500
1501 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1502 if (r < 0)
1503 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1504
1505 if (link->network->use_bpdu >= 0) {
1506 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
1507 if (r < 0)
1508 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1509 }
1510
1511 if (link->network->hairpin >= 0) {
1512 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1513 if (r < 0)
1514 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1515 }
1516
1517 if (link->network->fast_leave >= 0) {
1518 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1519 if (r < 0)
1520 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1521 }
1522
1523 if (link->network->allow_port_to_be_root >= 0) {
1524 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
1525 if (r < 0)
1526 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1527
1528 }
1529
1530 if (link->network->unicast_flood >= 0) {
1531 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1532 if (r < 0)
1533 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1534 }
1535
1536 if (link->network->multicast_to_unicast >= 0) {
1537 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_TO_UCAST, link->network->multicast_to_unicast);
1538 if (r < 0)
1539 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_TO_UCAST attribute: %m");
1540 }
1541
1542 if (link->network->cost != 0) {
1543 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1544 if (r < 0)
1545 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1546 }
1547
1548 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1549 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1550 if (r < 0)
1551 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1552 }
1553
1554 r = sd_netlink_message_close_container(req);
1555 if (r < 0)
1556 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1557
1558 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_handler,
1559 link_netlink_destroy_callback, link);
1560 if (r < 0)
1561 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1562
1563 link_ref(link);
1564
1565 return r;
1566 }
1567
1568 static int link_set_bond_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1569 int r;
1570
1571 assert(m);
1572 assert(link);
1573 assert(link->ifname);
1574
1575 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1576 return 1;
1577
1578 r = sd_netlink_message_get_errno(m);
1579 if (r < 0) {
1580 log_link_warning_errno(link, r, "Could not set bonding interface: %m");
1581 return 1;
1582 }
1583
1584 return 1;
1585 }
1586
1587 static int link_set_bond(Link *link) {
1588 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1589 int r;
1590
1591 assert(link);
1592 assert(link->network);
1593
1594 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1595 if (r < 0)
1596 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1597
1598 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1599 if (r < 0)
1600 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1601
1602 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1603 if (r < 0)
1604 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1605
1606 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1607 if (r < 0)
1608 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1609
1610 if (link->network->active_slave) {
1611 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1612 if (r < 0)
1613 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1614 }
1615
1616 if (link->network->primary_slave) {
1617 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1618 if (r < 0)
1619 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1620 }
1621
1622 r = sd_netlink_message_close_container(req);
1623 if (r < 0)
1624 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1625
1626 r = sd_netlink_message_close_container(req);
1627 if (r < 0)
1628 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1629
1630 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_bond_handler,
1631 link_netlink_destroy_callback, link);
1632 if (r < 0)
1633 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1634
1635 link_ref(link);
1636
1637 return r;
1638 }
1639
1640 static int link_append_bond_slave(Link *link) {
1641 Link *master;
1642 int r;
1643
1644 assert(link);
1645 assert(link->network);
1646 assert(link->network->bond);
1647
1648 r = link_get(link->manager, link->network->bond->ifindex, &master);
1649 if (r < 0)
1650 return r;
1651
1652 r = hashmap_ensure_allocated(&master->bond_slaves, NULL);
1653 if (r < 0)
1654 return r;
1655
1656 r = hashmap_put(master->bond_slaves, INT_TO_PTR(link->ifindex), link);
1657 if (r < 0)
1658 return r;
1659
1660 return 0;
1661 }
1662
1663 static int link_lldp_save(Link *link) {
1664 _cleanup_free_ char *temp_path = NULL;
1665 _cleanup_fclose_ FILE *f = NULL;
1666 sd_lldp_neighbor **l = NULL;
1667 int n = 0, r, i;
1668
1669 assert(link);
1670 assert(link->lldp_file);
1671
1672 if (!link->lldp) {
1673 (void) unlink(link->lldp_file);
1674 return 0;
1675 }
1676
1677 r = sd_lldp_get_neighbors(link->lldp, &l);
1678 if (r < 0)
1679 goto finish;
1680 if (r == 0) {
1681 (void) unlink(link->lldp_file);
1682 goto finish;
1683 }
1684
1685 n = r;
1686
1687 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1688 if (r < 0)
1689 goto finish;
1690
1691 fchmod(fileno(f), 0644);
1692
1693 for (i = 0; i < n; i++) {
1694 const void *p;
1695 le64_t u;
1696 size_t sz;
1697
1698 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1699 if (r < 0)
1700 goto finish;
1701
1702 u = htole64(sz);
1703 (void) fwrite(&u, 1, sizeof(u), f);
1704 (void) fwrite(p, 1, sz, f);
1705 }
1706
1707 r = fflush_and_check(f);
1708 if (r < 0)
1709 goto finish;
1710
1711 if (rename(temp_path, link->lldp_file) < 0) {
1712 r = -errno;
1713 goto finish;
1714 }
1715
1716 finish:
1717 if (r < 0) {
1718 (void) unlink(link->lldp_file);
1719 if (temp_path)
1720 (void) unlink(temp_path);
1721
1722 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1723 }
1724
1725 if (l) {
1726 for (i = 0; i < n; i++)
1727 sd_lldp_neighbor_unref(l[i]);
1728 free(l);
1729 }
1730
1731 return r;
1732 }
1733
1734 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1735 Link *link = userdata;
1736 int r;
1737
1738 assert(link);
1739
1740 (void) link_lldp_save(link);
1741
1742 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1743 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1744
1745 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1746
1747 r = link_lldp_emit_start(link);
1748 if (r < 0)
1749 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1750 }
1751 }
1752
1753 static int link_acquire_ipv6_conf(Link *link) {
1754 int r;
1755
1756 assert(link);
1757
1758 if (link_ipv6_accept_ra_enabled(link)) {
1759 assert(link->ndisc);
1760
1761 log_link_debug(link, "Discovering IPv6 routers");
1762
1763 r = sd_ndisc_start(link->ndisc);
1764 if (r < 0 && r != -EBUSY)
1765 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1766 }
1767
1768 if (link_radv_enabled(link)) {
1769 assert(link->radv);
1770 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1771
1772 log_link_debug(link, "Starting IPv6 Router Advertisements");
1773
1774 r = sd_radv_start(link->radv);
1775 if (r < 0 && r != -EBUSY)
1776 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1777 }
1778
1779 (void) dhcp6_request_prefix_delegation(link);
1780
1781 return 0;
1782 }
1783
1784 static int link_acquire_ipv4_conf(Link *link) {
1785 int r;
1786
1787 assert(link);
1788 assert(link->network);
1789 assert(link->manager);
1790 assert(link->manager->event);
1791
1792 if (link_ipv4ll_enabled(link)) {
1793 assert(link->ipv4ll);
1794
1795 log_link_debug(link, "Acquiring IPv4 link-local address");
1796
1797 r = sd_ipv4ll_start(link->ipv4ll);
1798 if (r < 0)
1799 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1800 }
1801
1802 if (link_dhcp4_enabled(link)) {
1803 assert(link->dhcp_client);
1804
1805 log_link_debug(link, "Acquiring DHCPv4 lease");
1806
1807 r = sd_dhcp_client_start(link->dhcp_client);
1808 if (r < 0)
1809 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1810 }
1811
1812 return 0;
1813 }
1814
1815 static int link_acquire_conf(Link *link) {
1816 int r;
1817
1818 assert(link);
1819
1820 r = link_acquire_ipv4_conf(link);
1821 if (r < 0)
1822 return r;
1823
1824 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1825 r = link_acquire_ipv6_conf(link);
1826 if (r < 0)
1827 return r;
1828 }
1829
1830 if (link_lldp_emit_enabled(link)) {
1831 r = link_lldp_emit_start(link);
1832 if (r < 0)
1833 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1834 }
1835
1836 return 0;
1837 }
1838
1839 bool link_has_carrier(Link *link) {
1840 /* see Documentation/networking/operstates.txt in the kernel sources */
1841
1842 if (link->kernel_operstate == IF_OPER_UP)
1843 return true;
1844
1845 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1846 /* operstate may not be implemented, so fall back to flags */
1847 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1848 return true;
1849
1850 return false;
1851 }
1852
1853 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1854 int r;
1855
1856 assert(link);
1857
1858 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1859 return 1;
1860
1861 r = sd_netlink_message_get_errno(m);
1862 if (r < 0)
1863 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1864
1865 return 1;
1866 }
1867
1868 static int link_configure_addrgen_mode(Link *link) {
1869 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1870 uint8_t ipv6ll_mode;
1871 int r;
1872
1873 assert(link);
1874 assert(link->network);
1875 assert(link->manager);
1876 assert(link->manager->rtnl);
1877
1878 log_link_debug(link, "Setting address genmode for link");
1879
1880 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1881 if (r < 0)
1882 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1883
1884 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1885 if (r < 0)
1886 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1887
1888 r = sd_netlink_message_open_container(req, AF_INET6);
1889 if (r < 0)
1890 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1891
1892 if (!link_ipv6ll_enabled(link))
1893 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1894 else {
1895 const char *p = NULL;
1896 _cleanup_free_ char *stable_secret = NULL;
1897
1898 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/stable_secret");
1899
1900 /* The file may not exist. And event if it exists, when stable_secret is unset,
1901 * then reading the file fails and EIO is returned. */
1902 r = read_one_line_file(p, &stable_secret);
1903 if (r < 0)
1904 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1905 else
1906 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1907 }
1908
1909 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1910 if (r < 0)
1911 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1912
1913 r = sd_netlink_message_close_container(req);
1914 if (r < 0)
1915 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1916
1917 r = sd_netlink_message_close_container(req);
1918 if (r < 0)
1919 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1920
1921 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1922 link_netlink_destroy_callback, link);
1923 if (r < 0)
1924 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1925
1926 link_ref(link);
1927
1928 return 0;
1929 }
1930
1931 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1932 int r;
1933
1934 assert(link);
1935
1936 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1937 return 1;
1938
1939 r = sd_netlink_message_get_errno(m);
1940 if (r < 0)
1941 /* we warn but don't fail the link, as it may be brought up later */
1942 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1943
1944 return 1;
1945 }
1946
1947 static int link_up(Link *link) {
1948 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1949 int r;
1950
1951 assert(link);
1952 assert(link->network);
1953 assert(link->manager);
1954 assert(link->manager->rtnl);
1955
1956 log_link_debug(link, "Bringing link up");
1957
1958 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1959 if (r < 0)
1960 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1961
1962 /* set it free if not enslaved with networkd */
1963 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1964 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1965 if (r < 0)
1966 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1967 }
1968
1969 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1970 if (r < 0)
1971 return log_link_error_errno(link, r, "Could not set link flags: %m");
1972
1973 if (link->network->mac) {
1974 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1975 if (r < 0)
1976 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1977 }
1978
1979 if (link_ipv6_enabled(link)) {
1980 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1981 if (r < 0)
1982 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1983
1984 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
1985 r = sd_netlink_message_open_container(req, AF_INET6);
1986 if (r < 0)
1987 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1988
1989 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
1990 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
1991 if (r < 0)
1992 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
1993 }
1994
1995 r = sd_netlink_message_close_container(req);
1996 if (r < 0)
1997 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1998
1999 r = sd_netlink_message_close_container(req);
2000 if (r < 0)
2001 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
2002 }
2003
2004 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2005 link_netlink_destroy_callback, link);
2006 if (r < 0)
2007 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2008
2009 link_ref(link);
2010
2011 return 0;
2012 }
2013
2014 static int link_up_can(Link *link) {
2015 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2016 int r;
2017
2018 assert(link);
2019
2020 log_link_debug(link, "Bringing CAN link up");
2021
2022 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2023 if (r < 0)
2024 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2025
2026 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
2027 if (r < 0)
2028 return log_link_error_errno(link, r, "Could not set link flags: %m");
2029
2030 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2031 link_netlink_destroy_callback, link);
2032 if (r < 0)
2033 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2034
2035 link_ref(link);
2036
2037 return 0;
2038 }
2039
2040 static int link_set_can(Link *link) {
2041 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
2042 int r;
2043
2044 assert(link);
2045 assert(link->network);
2046 assert(link->manager);
2047 assert(link->manager->rtnl);
2048
2049 log_link_debug(link, "link_set_can");
2050
2051 r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
2052 if (r < 0)
2053 return log_link_error_errno(link, r, "Failed to allocate netlink message: %m");
2054
2055 r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
2056 if (r < 0)
2057 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
2058
2059 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
2060 if (r < 0)
2061 return log_link_error_errno(link, r, "Failed to open netlink container: %m");
2062
2063 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
2064 if (r < 0)
2065 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
2066
2067 if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) {
2068 struct can_bittiming bt = {
2069 .bitrate = link->network->can_bitrate,
2070 .sample_point = link->network->can_sample_point,
2071 };
2072
2073 if (link->network->can_bitrate > UINT32_MAX) {
2074 log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate);
2075 return -ERANGE;
2076 }
2077
2078 log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate);
2079 if (link->network->can_sample_point > 0)
2080 log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
2081 else
2082 log_link_debug(link, "Using default sample point");
2083
2084 r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
2085 if (r < 0)
2086 return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
2087 }
2088
2089 if (link->network->can_restart_us > 0) {
2090 char time_string[FORMAT_TIMESPAN_MAX];
2091 uint64_t restart_ms;
2092
2093 if (link->network->can_restart_us == USEC_INFINITY)
2094 restart_ms = 0;
2095 else
2096 restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC);
2097
2098 format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC);
2099
2100 if (restart_ms > UINT32_MAX) {
2101 log_link_error(link, "restart timeout (%s) too big.", time_string);
2102 return -ERANGE;
2103 }
2104
2105 log_link_debug(link, "Setting restart = %s", time_string);
2106
2107 r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
2108 if (r < 0)
2109 return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
2110 }
2111
2112 r = sd_netlink_message_close_container(m);
2113 if (r < 0)
2114 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2115
2116 r = sd_netlink_message_close_container(m);
2117 if (r < 0)
2118 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2119
2120 r = netlink_call_async(link->manager->rtnl, NULL, m, link_set_handler,
2121 link_netlink_destroy_callback, link);
2122 if (r < 0)
2123 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2124
2125 link_ref(link);
2126
2127 if (!(link->flags & IFF_UP)) {
2128 r = link_up_can(link);
2129 if (r < 0) {
2130 link_enter_failed(link);
2131 return r;
2132 }
2133 }
2134
2135 log_link_debug(link, "link_set_can done");
2136
2137 return r;
2138 }
2139
2140 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2141 int r;
2142
2143 assert(link);
2144
2145 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2146 return 1;
2147
2148 r = sd_netlink_message_get_errno(m);
2149 if (r < 0)
2150 log_link_warning_errno(link, r, "Could not bring down interface: %m");
2151
2152 if (streq_ptr(link->kind, "can"))
2153 link_set_can(link);
2154
2155 return 1;
2156 }
2157
2158 int link_down(Link *link) {
2159 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2160 int r;
2161
2162 assert(link);
2163 assert(link->manager);
2164 assert(link->manager->rtnl);
2165
2166 log_link_debug(link, "Bringing link down");
2167
2168 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
2169 RTM_SETLINK, link->ifindex);
2170 if (r < 0)
2171 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2172
2173 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
2174 if (r < 0)
2175 return log_link_error_errno(link, r, "Could not set link flags: %m");
2176
2177 r = netlink_call_async(link->manager->rtnl, NULL, req, link_down_handler,
2178 link_netlink_destroy_callback, link);
2179 if (r < 0)
2180 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2181
2182 link_ref(link);
2183
2184 return 0;
2185 }
2186
2187 static int link_handle_bound_to_list(Link *link) {
2188 Link *l;
2189 Iterator i;
2190 int r;
2191 bool required_up = false;
2192 bool link_is_up = false;
2193
2194 assert(link);
2195
2196 if (hashmap_isempty(link->bound_to_links))
2197 return 0;
2198
2199 if (link->flags & IFF_UP)
2200 link_is_up = true;
2201
2202 HASHMAP_FOREACH (l, link->bound_to_links, i)
2203 if (link_has_carrier(l)) {
2204 required_up = true;
2205 break;
2206 }
2207
2208 if (!required_up && link_is_up) {
2209 r = link_down(link);
2210 if (r < 0)
2211 return r;
2212 } else if (required_up && !link_is_up) {
2213 r = link_up(link);
2214 if (r < 0)
2215 return r;
2216 }
2217
2218 return 0;
2219 }
2220
2221 static int link_handle_bound_by_list(Link *link) {
2222 Iterator i;
2223 Link *l;
2224 int r;
2225
2226 assert(link);
2227
2228 if (hashmap_isempty(link->bound_by_links))
2229 return 0;
2230
2231 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2232 r = link_handle_bound_to_list(l);
2233 if (r < 0)
2234 return r;
2235 }
2236
2237 return 0;
2238 }
2239
2240 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2241 int r;
2242
2243 assert(link);
2244 assert(carrier);
2245
2246 if (link == carrier)
2247 return 0;
2248
2249 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2250 return 0;
2251
2252 r = hashmap_ensure_allocated(h, NULL);
2253 if (r < 0)
2254 return r;
2255
2256 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2257 if (r < 0)
2258 return r;
2259
2260 return 0;
2261 }
2262
2263 static int link_new_bound_by_list(Link *link) {
2264 Manager *m;
2265 Link *carrier;
2266 Iterator i;
2267 int r;
2268 bool list_updated = false;
2269
2270 assert(link);
2271 assert(link->manager);
2272
2273 m = link->manager;
2274
2275 HASHMAP_FOREACH(carrier, m->links, i) {
2276 if (!carrier->network)
2277 continue;
2278
2279 if (strv_isempty(carrier->network->bind_carrier))
2280 continue;
2281
2282 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2283 r = link_put_carrier(link, carrier, &link->bound_by_links);
2284 if (r < 0)
2285 return r;
2286
2287 list_updated = true;
2288 }
2289 }
2290
2291 if (list_updated)
2292 link_dirty(link);
2293
2294 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2295 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2296 if (r < 0)
2297 return r;
2298
2299 link_dirty(carrier);
2300 }
2301
2302 return 0;
2303 }
2304
2305 static int link_new_bound_to_list(Link *link) {
2306 Manager *m;
2307 Link *carrier;
2308 Iterator i;
2309 int r;
2310 bool list_updated = false;
2311
2312 assert(link);
2313 assert(link->manager);
2314
2315 if (!link->network)
2316 return 0;
2317
2318 if (strv_isempty(link->network->bind_carrier))
2319 return 0;
2320
2321 m = link->manager;
2322
2323 HASHMAP_FOREACH (carrier, m->links, i) {
2324 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2325 r = link_put_carrier(link, carrier, &link->bound_to_links);
2326 if (r < 0)
2327 return r;
2328
2329 list_updated = true;
2330 }
2331 }
2332
2333 if (list_updated)
2334 link_dirty(link);
2335
2336 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2337 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2338 if (r < 0)
2339 return r;
2340
2341 link_dirty(carrier);
2342 }
2343
2344 return 0;
2345 }
2346
2347 static int link_new_carrier_maps(Link *link) {
2348 int r;
2349
2350 r = link_new_bound_by_list(link);
2351 if (r < 0)
2352 return r;
2353
2354 r = link_handle_bound_by_list(link);
2355 if (r < 0)
2356 return r;
2357
2358 r = link_new_bound_to_list(link);
2359 if (r < 0)
2360 return r;
2361
2362 r = link_handle_bound_to_list(link);
2363 if (r < 0)
2364 return r;
2365
2366 return 0;
2367 }
2368
2369 static void link_free_bound_to_list(Link *link) {
2370 Link *bound_to;
2371 Iterator i;
2372
2373 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2374 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2375
2376 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2377 link_dirty(bound_to);
2378 }
2379
2380 return;
2381 }
2382
2383 static void link_free_bound_by_list(Link *link) {
2384 Link *bound_by;
2385 Iterator i;
2386
2387 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2388 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2389
2390 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2391 link_dirty(bound_by);
2392 link_handle_bound_to_list(bound_by);
2393 }
2394 }
2395
2396 return;
2397 }
2398
2399 static void link_free_carrier_maps(Link *link) {
2400 bool list_updated = false;
2401
2402 assert(link);
2403
2404 if (!hashmap_isempty(link->bound_to_links)) {
2405 link_free_bound_to_list(link);
2406 list_updated = true;
2407 }
2408
2409 if (!hashmap_isempty(link->bound_by_links)) {
2410 link_free_bound_by_list(link);
2411 list_updated = true;
2412 }
2413
2414 if (list_updated)
2415 link_dirty(link);
2416
2417 return;
2418 }
2419
2420 void link_drop(Link *link) {
2421 if (!link || link->state == LINK_STATE_LINGER)
2422 return;
2423
2424 link_set_state(link, LINK_STATE_LINGER);
2425
2426 link_free_carrier_maps(link);
2427
2428 log_link_debug(link, "Link removed");
2429
2430 (void) unlink(link->state_file);
2431
2432 link_detach_from_manager(link);
2433
2434 link_unref(link);
2435
2436 return;
2437 }
2438
2439 static int link_joined(Link *link) {
2440 int r;
2441
2442 assert(link);
2443 assert(link->network);
2444
2445 if (!hashmap_isempty(link->bound_to_links)) {
2446 r = link_handle_bound_to_list(link);
2447 if (r < 0)
2448 return r;
2449 } else if (!(link->flags & IFF_UP)) {
2450 r = link_up(link);
2451 if (r < 0) {
2452 link_enter_failed(link);
2453 return r;
2454 }
2455 }
2456
2457 if (link->network->bridge) {
2458 r = link_set_bridge(link);
2459 if (r < 0)
2460 log_link_error_errno(link, r, "Could not set bridge message: %m");
2461 }
2462
2463 if (link->network->bond) {
2464 r = link_set_bond(link);
2465 if (r < 0)
2466 log_link_error_errno(link, r, "Could not set bond message: %m");
2467
2468 r = link_append_bond_slave(link);
2469 if (r < 0)
2470 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2471 }
2472
2473 if (link->network->use_br_vlan &&
2474 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2475 r = link_set_bridge_vlan(link);
2476 if (r < 0)
2477 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2478 }
2479
2480 /* Skip setting up addresses until it gets carrier,
2481 or it would try to set addresses twice,
2482 which is bad for non-idempotent steps. */
2483 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2484 return 0;
2485
2486 return link_request_set_addresses(link);
2487 }
2488
2489 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2490 int r;
2491
2492 assert(link);
2493 assert(link->network);
2494
2495 link->enslaving--;
2496
2497 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2498 return 1;
2499
2500 r = sd_netlink_message_get_errno(m);
2501 if (r < 0 && r != -EEXIST) {
2502 log_link_error_errno(link, r, "Could not join netdev: %m");
2503 link_enter_failed(link);
2504 return 1;
2505 } else
2506 log_link_debug(link, "Joined netdev");
2507
2508 if (link->enslaving <= 0)
2509 link_joined(link);
2510
2511 return 1;
2512 }
2513
2514 static int link_enter_join_netdev(Link *link) {
2515 NetDev *netdev;
2516 Iterator i;
2517 int r;
2518
2519 assert(link);
2520 assert(link->network);
2521 assert(link->state == LINK_STATE_PENDING);
2522
2523 link_set_state(link, LINK_STATE_CONFIGURING);
2524
2525 link_dirty(link);
2526
2527 if (!link->network->bridge &&
2528 !link->network->bond &&
2529 !link->network->vrf &&
2530 hashmap_isempty(link->network->stacked_netdevs))
2531 return link_joined(link);
2532
2533 if (link->network->bond) {
2534 if (link->network->bond->state == NETDEV_STATE_READY &&
2535 link->network->bond->ifindex == link->master_ifindex)
2536 return link_joined(link);
2537
2538 log_struct(LOG_DEBUG,
2539 LOG_LINK_INTERFACE(link),
2540 LOG_NETDEV_INTERFACE(link->network->bond),
2541 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2542
2543 r = netdev_join(link->network->bond, link, netdev_join_handler);
2544 if (r < 0) {
2545 log_struct_errno(LOG_WARNING, r,
2546 LOG_LINK_INTERFACE(link),
2547 LOG_NETDEV_INTERFACE(link->network->bond),
2548 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2549 link_enter_failed(link);
2550 return r;
2551 }
2552
2553 link->enslaving++;
2554 }
2555
2556 if (link->network->bridge) {
2557 log_struct(LOG_DEBUG,
2558 LOG_LINK_INTERFACE(link),
2559 LOG_NETDEV_INTERFACE(link->network->bridge),
2560 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2561
2562 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2563 if (r < 0) {
2564 log_struct_errno(LOG_WARNING, r,
2565 LOG_LINK_INTERFACE(link),
2566 LOG_NETDEV_INTERFACE(link->network->bridge),
2567 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2568 link_enter_failed(link);
2569 return r;
2570 }
2571
2572 link->enslaving++;
2573 }
2574
2575 if (link->network->vrf) {
2576 log_struct(LOG_DEBUG,
2577 LOG_LINK_INTERFACE(link),
2578 LOG_NETDEV_INTERFACE(link->network->vrf),
2579 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2580
2581 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2582 if (r < 0) {
2583 log_struct_errno(LOG_WARNING, r,
2584 LOG_LINK_INTERFACE(link),
2585 LOG_NETDEV_INTERFACE(link->network->vrf),
2586 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2587 link_enter_failed(link);
2588 return r;
2589 }
2590
2591 link->enslaving++;
2592 }
2593
2594 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2595
2596 if (netdev->ifindex > 0) {
2597 link_joined(link);
2598 continue;
2599 }
2600
2601 log_struct(LOG_DEBUG,
2602 LOG_LINK_INTERFACE(link),
2603 LOG_NETDEV_INTERFACE(netdev),
2604 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2605
2606 r = netdev_join(netdev, link, netdev_join_handler);
2607 if (r < 0) {
2608 log_struct_errno(LOG_WARNING, r,
2609 LOG_LINK_INTERFACE(link),
2610 LOG_NETDEV_INTERFACE(netdev),
2611 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2612 link_enter_failed(link);
2613 return r;
2614 }
2615
2616 link->enslaving++;
2617 }
2618
2619 return 0;
2620 }
2621
2622 static int link_set_ipv4_forward(Link *link) {
2623 int r;
2624
2625 if (!link_ipv4_forward_enabled(link))
2626 return 0;
2627
2628 /* We propagate the forwarding flag from one interface to the
2629 * global setting one way. This means: as long as at least one
2630 * interface was configured at any time that had IP forwarding
2631 * enabled the setting will stay on for good. We do this
2632 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2633 * somewhat in sync (see below). */
2634
2635 r = write_string_file("/proc/sys/net/ipv4/ip_forward", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2636 if (r < 0)
2637 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2638
2639 return 0;
2640 }
2641
2642 static int link_set_ipv6_forward(Link *link) {
2643 int r;
2644
2645 if (!link_ipv6_forward_enabled(link))
2646 return 0;
2647
2648 /* On Linux, the IPv6 stack does not know a per-interface
2649 * packet forwarding setting: either packet forwarding is on
2650 * for all, or off for all. We hence don't bother with a
2651 * per-interface setting, but simply propagate the interface
2652 * flag, if it is set, to the global flag, one-way. Note that
2653 * while IPv4 would allow a per-interface flag, we expose the
2654 * same behaviour there and also propagate the setting from
2655 * one to all, to keep things simple (see above). */
2656
2657 r = write_string_file("/proc/sys/net/ipv6/conf/all/forwarding", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2658 if (r < 0)
2659 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2660
2661 return 0;
2662 }
2663
2664 static int link_set_ipv6_privacy_extensions(Link *link) {
2665 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2666 IPv6PrivacyExtensions s;
2667 const char *p = NULL;
2668 int r;
2669
2670 s = link_ipv6_privacy_extensions(link);
2671 if (s < 0)
2672 return 0;
2673
2674 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/use_tempaddr");
2675 xsprintf(buf, "%u", (unsigned) link->network->ipv6_privacy_extensions);
2676
2677 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2678 if (r < 0)
2679 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2680
2681 return 0;
2682 }
2683
2684 static int link_set_ipv6_accept_ra(Link *link) {
2685 const char *p = NULL;
2686 int r;
2687
2688 /* Make this a NOP if IPv6 is not available */
2689 if (!socket_ipv6_is_supported())
2690 return 0;
2691
2692 if (link->flags & IFF_LOOPBACK)
2693 return 0;
2694
2695 if (!link->network)
2696 return 0;
2697
2698 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/accept_ra");
2699
2700 /* We handle router advertisements ourselves, tell the kernel to GTFO */
2701 r = write_string_file(p, "0", WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2702 if (r < 0)
2703 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2704
2705 return 0;
2706 }
2707
2708 static int link_set_ipv6_dad_transmits(Link *link) {
2709 char buf[DECIMAL_STR_MAX(int) + 1];
2710 const char *p = NULL;
2711 int r;
2712
2713 /* Make this a NOP if IPv6 is not available */
2714 if (!socket_ipv6_is_supported())
2715 return 0;
2716
2717 if (link->flags & IFF_LOOPBACK)
2718 return 0;
2719
2720 if (!link->network)
2721 return 0;
2722
2723 if (link->network->ipv6_dad_transmits < 0)
2724 return 0;
2725
2726 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/dad_transmits");
2727 xsprintf(buf, "%i", link->network->ipv6_dad_transmits);
2728
2729 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2730 if (r < 0)
2731 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2732
2733 return 0;
2734 }
2735
2736 static int link_set_ipv6_hop_limit(Link *link) {
2737 char buf[DECIMAL_STR_MAX(int) + 1];
2738 const char *p = NULL;
2739 int r;
2740
2741 /* Make this a NOP if IPv6 is not available */
2742 if (!socket_ipv6_is_supported())
2743 return 0;
2744
2745 if (link->flags & IFF_LOOPBACK)
2746 return 0;
2747
2748 if (!link->network)
2749 return 0;
2750
2751 if (link->network->ipv6_hop_limit < 0)
2752 return 0;
2753
2754 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/hop_limit");
2755 xsprintf(buf, "%i", link->network->ipv6_hop_limit);
2756
2757 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2758 if (r < 0)
2759 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2760
2761 return 0;
2762 }
2763
2764 static int link_set_ipv6_mtu(Link *link) {
2765 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2766 const char *p = NULL;
2767 int r;
2768
2769 /* Make this a NOP if IPv6 is not available */
2770 if (!socket_ipv6_is_supported())
2771 return 0;
2772
2773 if (link->flags & IFF_LOOPBACK)
2774 return 0;
2775
2776 if (link->network->ipv6_mtu == 0)
2777 return 0;
2778
2779 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/mtu");
2780
2781 xsprintf(buf, "%" PRIu32, link->network->ipv6_mtu);
2782
2783 r = write_string_file(p, buf, WRITE_STRING_FILE_DISABLE_BUFFER);
2784 if (r < 0)
2785 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2786
2787 return 0;
2788 }
2789
2790 static bool link_is_static_address_configured(Link *link, Address *address) {
2791 Address *net_address;
2792
2793 assert(link);
2794 assert(address);
2795
2796 if (!link->network)
2797 return false;
2798
2799 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2800 if (address_equal(net_address, address))
2801 return true;
2802
2803 return false;
2804 }
2805
2806 static bool link_is_static_route_configured(Link *link, Route *route) {
2807 Route *net_route;
2808
2809 assert(link);
2810 assert(route);
2811
2812 if (!link->network)
2813 return false;
2814
2815 LIST_FOREACH(routes, net_route, link->network->static_routes)
2816 if (route_equal(net_route, route))
2817 return true;
2818
2819 return false;
2820 }
2821
2822 static int link_drop_foreign_config(Link *link) {
2823 Address *address;
2824 Route *route;
2825 Iterator i;
2826 int r;
2827
2828 SET_FOREACH(address, link->addresses_foreign, i) {
2829 /* we consider IPv6LL addresses to be managed by the kernel */
2830 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2831 continue;
2832
2833 if (link_is_static_address_configured(link, address)) {
2834 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2835 if (r < 0)
2836 return log_link_error_errno(link, r, "Failed to add address: %m");
2837 } else {
2838 r = address_remove(address, link, NULL);
2839 if (r < 0)
2840 return r;
2841 }
2842 }
2843
2844 SET_FOREACH(route, link->routes_foreign, i) {
2845 /* do not touch routes managed by the kernel */
2846 if (route->protocol == RTPROT_KERNEL)
2847 continue;
2848
2849 if (link_is_static_route_configured(link, route)) {
2850 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2851 if (r < 0)
2852 return r;
2853 } else {
2854 r = route_remove(route, link, NULL);
2855 if (r < 0)
2856 return r;
2857 }
2858 }
2859
2860 return 0;
2861 }
2862
2863 static int link_drop_config(Link *link) {
2864 Address *address, *pool_address;
2865 Route *route;
2866 Iterator i;
2867 int r;
2868
2869 SET_FOREACH(address, link->addresses, i) {
2870 /* we consider IPv6LL addresses to be managed by the kernel */
2871 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2872 continue;
2873
2874 r = address_remove(address, link, NULL);
2875 if (r < 0)
2876 return r;
2877
2878 /* If this address came from an address pool, clean up the pool */
2879 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2880 if (address_equal(address, pool_address)) {
2881 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2882 address_free(pool_address);
2883 break;
2884 }
2885 }
2886 }
2887
2888 SET_FOREACH(route, link->routes, i) {
2889 /* do not touch routes managed by the kernel */
2890 if (route->protocol == RTPROT_KERNEL)
2891 continue;
2892
2893 r = route_remove(route, link, NULL);
2894 if (r < 0)
2895 return r;
2896 }
2897
2898 ndisc_flush(link);
2899
2900 return 0;
2901 }
2902
2903 static int link_update_lldp(Link *link) {
2904 int r;
2905
2906 assert(link);
2907
2908 if (!link->lldp)
2909 return 0;
2910
2911 if (link->flags & IFF_UP) {
2912 r = sd_lldp_start(link->lldp);
2913 if (r > 0)
2914 log_link_debug(link, "Started LLDP.");
2915 } else {
2916 r = sd_lldp_stop(link->lldp);
2917 if (r > 0)
2918 log_link_debug(link, "Stopped LLDP.");
2919 }
2920
2921 return r;
2922 }
2923
2924 static int link_configure_can(Link *link) {
2925 int r;
2926
2927 if (streq_ptr(link->kind, "can")) {
2928 /* The CAN interface must be down to configure bitrate, etc... */
2929 if ((link->flags & IFF_UP)) {
2930 r = link_down(link);
2931 if (r < 0) {
2932 link_enter_failed(link);
2933 return r;
2934 }
2935
2936 return 0;
2937 }
2938
2939 return link_set_can(link);
2940 }
2941
2942 if (!(link->flags & IFF_UP)) {
2943 r = link_up_can(link);
2944 if (r < 0) {
2945 link_enter_failed(link);
2946 return r;
2947 }
2948 }
2949
2950 return 0;
2951 }
2952
2953 static int link_configure(Link *link) {
2954 int r;
2955
2956 assert(link);
2957 assert(link->network);
2958 assert(link->state == LINK_STATE_PENDING);
2959
2960 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
2961 return link_configure_can(link);
2962
2963 /* Drop foreign config, but ignore loopback or critical devices.
2964 * We do not want to remove loopback address or addresses used for root NFS. */
2965 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2966 r = link_drop_foreign_config(link);
2967 if (r < 0)
2968 return r;
2969 }
2970
2971 r = link_set_proxy_arp(link);
2972 if (r < 0)
2973 return r;
2974
2975 r = ipv6_proxy_ndp_addresses_configure(link);
2976 if (r < 0)
2977 return r;
2978
2979 r = link_set_ipv4_forward(link);
2980 if (r < 0)
2981 return r;
2982
2983 r = link_set_ipv6_forward(link);
2984 if (r < 0)
2985 return r;
2986
2987 r = link_set_ipv6_privacy_extensions(link);
2988 if (r < 0)
2989 return r;
2990
2991 r = link_set_ipv6_accept_ra(link);
2992 if (r < 0)
2993 return r;
2994
2995 r = link_set_ipv6_dad_transmits(link);
2996 if (r < 0)
2997 return r;
2998
2999 r = link_set_ipv6_hop_limit(link);
3000 if (r < 0)
3001 return r;
3002
3003 r = link_set_flags(link);
3004 if (r < 0)
3005 return r;
3006
3007 r = link_set_ipv6_mtu(link);
3008 if (r < 0)
3009 return r;
3010
3011 if (link_ipv4ll_enabled(link)) {
3012 r = ipv4ll_configure(link);
3013 if (r < 0)
3014 return r;
3015 }
3016
3017 if (link_dhcp4_enabled(link)) {
3018 r = dhcp4_set_promote_secondaries(link);
3019 if (r < 0)
3020 return r;
3021
3022 r = dhcp4_configure(link);
3023 if (r < 0)
3024 return r;
3025 }
3026
3027 if (link_dhcp4_server_enabled(link)) {
3028 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
3029 if (r < 0)
3030 return r;
3031
3032 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
3033 if (r < 0)
3034 return r;
3035 }
3036
3037 if (link_dhcp6_enabled(link) ||
3038 link_ipv6_accept_ra_enabled(link)) {
3039 r = dhcp6_configure(link);
3040 if (r < 0)
3041 return r;
3042 }
3043
3044 if (link_ipv6_accept_ra_enabled(link)) {
3045 r = ndisc_configure(link);
3046 if (r < 0)
3047 return r;
3048 }
3049
3050 if (link_radv_enabled(link)) {
3051 r = radv_configure(link);
3052 if (r < 0)
3053 return r;
3054 }
3055
3056 if (link_lldp_rx_enabled(link)) {
3057 r = sd_lldp_new(&link->lldp);
3058 if (r < 0)
3059 return r;
3060
3061 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
3062 if (r < 0)
3063 return r;
3064
3065 r = sd_lldp_match_capabilities(link->lldp,
3066 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
3067 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
3068 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
3069 if (r < 0)
3070 return r;
3071
3072 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
3073 if (r < 0)
3074 return r;
3075
3076 r = sd_lldp_attach_event(link->lldp, NULL, 0);
3077 if (r < 0)
3078 return r;
3079
3080 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
3081 if (r < 0)
3082 return r;
3083
3084 r = link_update_lldp(link);
3085 if (r < 0)
3086 return r;
3087 }
3088
3089 if (link->network->mtu > 0) {
3090 r = link_set_mtu(link, link->network->mtu);
3091 if (r < 0)
3092 return r;
3093 }
3094
3095 if (socket_ipv6_is_supported()) {
3096 r = link_configure_addrgen_mode(link);
3097 if (r < 0)
3098 return r;
3099 }
3100
3101 return link_configure_after_setting_mtu(link);
3102 }
3103
3104 static int link_configure_after_setting_mtu(Link *link) {
3105 int r;
3106
3107 assert(link);
3108 assert(link->network);
3109 assert(link->state == LINK_STATE_PENDING);
3110
3111 if (link->setting_mtu)
3112 return 0;
3113
3114 if (link_has_carrier(link) || link->network->configure_without_carrier) {
3115 r = link_acquire_conf(link);
3116 if (r < 0)
3117 return r;
3118 }
3119
3120 return link_enter_join_netdev(link);
3121 }
3122
3123 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3124 assert(duid);
3125
3126 if (duid->raw_data_len > 0)
3127 return 0;
3128
3129 if (duid->type != DUID_TYPE_UUID)
3130 return -EINVAL;
3131
3132 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3133 duid->raw_data_len = sizeof(sd_id128_t);
3134
3135 return 1;
3136 }
3137
3138 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3139 Manager *manager = userdata;
3140 const sd_bus_error *e;
3141 const void *a;
3142 size_t sz;
3143 DUID *duid;
3144 Link *link;
3145 int r;
3146
3147 assert(m);
3148 assert(manager);
3149
3150 e = sd_bus_message_get_error(m);
3151 if (e) {
3152 log_error_errno(sd_bus_error_get_errno(e),
3153 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3154 e->message);
3155 goto configure;
3156 }
3157
3158 r = sd_bus_message_read_array(m, 'y', &a, &sz);
3159 if (r < 0)
3160 goto configure;
3161
3162 if (sz != sizeof(sd_id128_t)) {
3163 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3164 goto configure;
3165 }
3166
3167 memcpy(&manager->product_uuid, a, sz);
3168 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3169 (void) duid_set_uuid(duid, manager->product_uuid);
3170
3171 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3172
3173 configure:
3174 while ((link = set_steal_first(manager->links_requesting_uuid))) {
3175 r = link_configure(link);
3176 if (r < 0)
3177 log_link_error_errno(link, r, "Failed to configure link: %m");
3178 }
3179
3180 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3181
3182 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3183 * even if the method fails. */
3184 manager->has_product_uuid = true;
3185
3186 return 1;
3187 }
3188
3189 static bool link_requires_uuid(Link *link) {
3190 const DUID *duid;
3191
3192 assert(link);
3193 assert(link->manager);
3194 assert(link->network);
3195
3196 duid = link_get_duid(link);
3197 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3198 return false;
3199
3200 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3201 return true;
3202
3203 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3204 return true;
3205
3206 return false;
3207 }
3208
3209 static int link_configure_duid(Link *link) {
3210 Manager *m;
3211 DUID *duid;
3212 int r;
3213
3214 assert(link);
3215 assert(link->manager);
3216 assert(link->network);
3217
3218 m = link->manager;
3219 duid = link_get_duid(link);
3220
3221 if (!link_requires_uuid(link))
3222 return 1;
3223
3224 if (m->has_product_uuid) {
3225 (void) duid_set_uuid(duid, m->product_uuid);
3226 return 1;
3227 }
3228
3229 if (!m->links_requesting_uuid) {
3230 r = manager_request_product_uuid(m, link);
3231 if (r < 0) {
3232 if (r == -ENOMEM)
3233 return r;
3234
3235 log_link_warning_errno(link, r,
3236 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3237 return 1;
3238 }
3239 } else {
3240 r = set_put(m->links_requesting_uuid, link);
3241 if (r < 0)
3242 return log_oom();
3243
3244 r = set_put(m->duids_requesting_uuid, duid);
3245 if (r < 0)
3246 return log_oom();
3247 }
3248
3249 return 0;
3250 }
3251
3252 static int link_initialized_and_synced(Link *link) {
3253 Network *network;
3254 int r;
3255
3256 assert(link);
3257 assert(link->ifname);
3258 assert(link->manager);
3259
3260 if (link->state != LINK_STATE_PENDING)
3261 return 1;
3262
3263 log_link_debug(link, "Link state is up-to-date");
3264
3265 r = link_new_bound_by_list(link);
3266 if (r < 0)
3267 return r;
3268
3269 r = link_handle_bound_by_list(link);
3270 if (r < 0)
3271 return r;
3272
3273 if (!link->network) {
3274 r = network_get(link->manager, link->sd_device, link->ifname,
3275 &link->mac, &network);
3276 if (r == -ENOENT) {
3277 link_enter_unmanaged(link);
3278 return 1;
3279 } else if (r == 0 && network->unmanaged) {
3280 link_enter_unmanaged(link);
3281 return 0;
3282 } else if (r < 0)
3283 return r;
3284
3285 if (link->flags & IFF_LOOPBACK) {
3286 if (network->link_local != ADDRESS_FAMILY_NO)
3287 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3288
3289 if (network->dhcp != ADDRESS_FAMILY_NO)
3290 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3291
3292 if (network->dhcp_server)
3293 log_link_debug(link, "Ignoring DHCP server for loopback link");
3294 }
3295
3296 r = network_apply(network, link);
3297 if (r < 0)
3298 return r;
3299 }
3300
3301 r = link_new_bound_to_list(link);
3302 if (r < 0)
3303 return r;
3304
3305 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3306 * link_configure() is called later asynchronously. */
3307 r = link_configure_duid(link);
3308 if (r <= 0)
3309 return r;
3310
3311 r = link_configure(link);
3312 if (r < 0)
3313 return r;
3314
3315 return 1;
3316 }
3317
3318 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3319 (void) link_initialized_and_synced(link);
3320 return 1;
3321 }
3322
3323 int link_initialized(Link *link, sd_device *device) {
3324 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3325 int r;
3326
3327 assert(link);
3328 assert(link->manager);
3329 assert(link->manager->rtnl);
3330 assert(device);
3331
3332 if (link->state != LINK_STATE_PENDING)
3333 return 0;
3334
3335 if (link->sd_device)
3336 return 0;
3337
3338 log_link_debug(link, "udev initialized link");
3339
3340 link->sd_device = sd_device_ref(device);
3341
3342 /* udev has initialized the link, but we don't know if we have yet
3343 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3344 * when it returns we know that the pending NEWLINKs have already been
3345 * processed and that we are up-to-date */
3346
3347 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3348 link->ifindex);
3349 if (r < 0)
3350 return r;
3351
3352 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3353 link_netlink_destroy_callback, link);
3354 if (r < 0)
3355 return r;
3356
3357 link_ref(link);
3358
3359 return 0;
3360 }
3361
3362 static int link_load(Link *link) {
3363 _cleanup_free_ char *network_file = NULL,
3364 *addresses = NULL,
3365 *routes = NULL,
3366 *dhcp4_address = NULL,
3367 *ipv4ll_address = NULL;
3368 union in_addr_union address;
3369 union in_addr_union route_dst;
3370 const char *p;
3371 int r;
3372
3373 assert(link);
3374
3375 r = parse_env_file(NULL, link->state_file,
3376 "NETWORK_FILE", &network_file,
3377 "ADDRESSES", &addresses,
3378 "ROUTES", &routes,
3379 "DHCP4_ADDRESS", &dhcp4_address,
3380 "IPV4LL_ADDRESS", &ipv4ll_address);
3381 if (r < 0 && r != -ENOENT)
3382 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3383
3384 if (network_file) {
3385 Network *network;
3386 char *suffix;
3387
3388 /* drop suffix */
3389 suffix = strrchr(network_file, '.');
3390 if (!suffix) {
3391 log_link_debug(link, "Failed to get network name from %s", network_file);
3392 goto network_file_fail;
3393 }
3394 *suffix = '\0';
3395
3396 r = network_get_by_name(link->manager, basename(network_file), &network);
3397 if (r < 0) {
3398 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3399 goto network_file_fail;
3400 }
3401
3402 r = network_apply(network, link);
3403 if (r < 0)
3404 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3405 }
3406
3407 network_file_fail:
3408
3409 if (addresses) {
3410 p = addresses;
3411
3412 for (;;) {
3413 _cleanup_free_ char *address_str = NULL;
3414 char *prefixlen_str;
3415 int family;
3416 unsigned char prefixlen;
3417
3418 r = extract_first_word(&p, &address_str, NULL, 0);
3419 if (r < 0) {
3420 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3421 continue;
3422 }
3423 if (r == 0)
3424 break;
3425
3426 prefixlen_str = strchr(address_str, '/');
3427 if (!prefixlen_str) {
3428 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3429 continue;
3430 }
3431
3432 *prefixlen_str++ = '\0';
3433
3434 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3435 if (r != 1) {
3436 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3437 continue;
3438 }
3439
3440 r = in_addr_from_string_auto(address_str, &family, &address);
3441 if (r < 0) {
3442 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3443 continue;
3444 }
3445
3446 r = address_add(link, family, &address, prefixlen, NULL);
3447 if (r < 0)
3448 return log_link_error_errno(link, r, "Failed to add address: %m");
3449 }
3450 }
3451
3452 if (routes) {
3453 p = routes;
3454
3455 for (;;) {
3456 Route *route;
3457 _cleanup_free_ char *route_str = NULL;
3458 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3459 usec_t lifetime;
3460 char *prefixlen_str;
3461 int family;
3462 unsigned char prefixlen, tos, table;
3463 uint32_t priority;
3464
3465 r = extract_first_word(&p, &route_str, NULL, 0);
3466 if (r < 0) {
3467 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3468 continue;
3469 }
3470 if (r == 0)
3471 break;
3472
3473 prefixlen_str = strchr(route_str, '/');
3474 if (!prefixlen_str) {
3475 log_link_debug(link, "Failed to parse route %s", route_str);
3476 continue;
3477 }
3478
3479 *prefixlen_str++ = '\0';
3480
3481 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3482 if (r != 5) {
3483 log_link_debug(link,
3484 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3485 prefixlen_str);
3486 continue;
3487 }
3488
3489 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3490 if (r < 0) {
3491 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3492 continue;
3493 }
3494
3495 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3496 if (r < 0)
3497 return log_link_error_errno(link, r, "Failed to add route: %m");
3498
3499 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3500 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3501 0, route_expire_handler, route);
3502 if (r < 0)
3503 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3504 }
3505
3506 route->lifetime = lifetime;
3507 sd_event_source_unref(route->expire);
3508 route->expire = TAKE_PTR(expire);
3509 }
3510 }
3511
3512 if (dhcp4_address) {
3513 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3514 if (r < 0) {
3515 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3516 goto dhcp4_address_fail;
3517 }
3518
3519 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3520 if (r < 0)
3521 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3522
3523 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3524 if (r < 0)
3525 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3526 }
3527
3528 dhcp4_address_fail:
3529
3530 if (ipv4ll_address) {
3531 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3532 if (r < 0) {
3533 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3534 goto ipv4ll_address_fail;
3535 }
3536
3537 r = sd_ipv4ll_new(&link->ipv4ll);
3538 if (r < 0)
3539 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3540
3541 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3542 if (r < 0)
3543 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3544 }
3545
3546 ipv4ll_address_fail:
3547
3548 return 0;
3549 }
3550
3551 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3552 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3553 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3554 Link *link;
3555 int r;
3556
3557 assert(m);
3558 assert(m->rtnl);
3559 assert(message);
3560 assert(ret);
3561
3562 r = link_new(m, message, ret);
3563 if (r < 0)
3564 return r;
3565
3566 link = *ret;
3567
3568 log_link_debug(link, "Link %d added", link->ifindex);
3569
3570 r = link_load(link);
3571 if (r < 0)
3572 return r;
3573
3574 if (detect_container() <= 0) {
3575 /* not in a container, udev will be around */
3576 sprintf(ifindex_str, "n%d", link->ifindex);
3577 r = sd_device_new_from_device_id(&device, ifindex_str);
3578 if (r < 0) {
3579 log_link_warning_errno(link, r, "Could not find device: %m");
3580 goto failed;
3581 }
3582
3583 r = sd_device_get_is_initialized(device);
3584 if (r < 0) {
3585 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3586 goto failed;
3587 }
3588 if (r == 0) {
3589 /* not yet ready */
3590 log_link_debug(link, "link pending udev initialization...");
3591 return 0;
3592 }
3593
3594 r = link_initialized(link, device);
3595 if (r < 0)
3596 goto failed;
3597 } else {
3598 r = link_initialized_and_synced(link);
3599 if (r < 0)
3600 goto failed;
3601 }
3602
3603 return 0;
3604 failed:
3605 link_enter_failed(link);
3606 return r;
3607 }
3608
3609 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3610 int r;
3611
3612 assert(link);
3613
3614 log_link_info(link, "Gained IPv6LL");
3615
3616 link->ipv6ll_address = *address;
3617 link_check_ready(link);
3618
3619 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3620 r = link_acquire_ipv6_conf(link);
3621 if (r < 0) {
3622 link_enter_failed(link);
3623 return r;
3624 }
3625 }
3626
3627 return 0;
3628 }
3629
3630 static int link_carrier_gained(Link *link) {
3631 int r;
3632
3633 assert(link);
3634
3635 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3636 r = link_acquire_conf(link);
3637 if (r < 0) {
3638 link_enter_failed(link);
3639 return r;
3640 }
3641
3642 r = link_request_set_addresses(link);
3643 if (r < 0)
3644 return r;
3645 }
3646
3647 r = link_handle_bound_by_list(link);
3648 if (r < 0)
3649 return r;
3650
3651 return 0;
3652 }
3653
3654 static int link_carrier_lost(Link *link) {
3655 int r;
3656
3657 assert(link);
3658
3659 if (link->network->ignore_carrier_loss)
3660 return 0;
3661
3662 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3663 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3664 * configuration and stop the clients as well. */
3665 if (link->setting_mtu)
3666 return 0;
3667
3668 r = link_stop_clients(link);
3669 if (r < 0) {
3670 link_enter_failed(link);
3671 return r;
3672 }
3673
3674 if (link_dhcp4_server_enabled(link))
3675 (void) sd_dhcp_server_stop(link->dhcp_server);
3676
3677 r = link_drop_config(link);
3678 if (r < 0)
3679 return r;
3680
3681 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3682 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3683 r = link_drop_foreign_config(link);
3684 if (r < 0)
3685 return r;
3686 }
3687
3688 r = link_handle_bound_by_list(link);
3689 if (r < 0)
3690 return r;
3691
3692 return 0;
3693 }
3694
3695 int link_carrier_reset(Link *link) {
3696 int r;
3697
3698 assert(link);
3699
3700 if (link_has_carrier(link)) {
3701 r = link_carrier_lost(link);
3702 if (r < 0)
3703 return r;
3704
3705 r = link_carrier_gained(link);
3706 if (r < 0)
3707 return r;
3708
3709 log_link_info(link, "Reset carrier");
3710 }
3711
3712 return 0;
3713 }
3714
3715 int link_update(Link *link, sd_netlink_message *m) {
3716 struct ether_addr mac;
3717 const char *ifname;
3718 uint32_t mtu;
3719 bool had_carrier, carrier_gained, carrier_lost;
3720 int r;
3721
3722 assert(link);
3723 assert(link->ifname);
3724 assert(m);
3725
3726 if (link->state == LINK_STATE_LINGER) {
3727 log_link_info(link, "Link readded");
3728 link_set_state(link, LINK_STATE_CONFIGURING);
3729
3730 r = link_new_carrier_maps(link);
3731 if (r < 0)
3732 return r;
3733 }
3734
3735 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3736 if (r >= 0 && !streq(ifname, link->ifname)) {
3737 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3738
3739 if (link->state == LINK_STATE_PENDING) {
3740 r = free_and_strdup(&link->ifname, ifname);
3741 if (r < 0)
3742 return r;
3743 } else {
3744 Manager *manager = link->manager;
3745
3746 link_drop(link);
3747 r = link_add(manager, m, &link);
3748 if (r < 0)
3749 return r;
3750 }
3751 }
3752
3753 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3754 if (r >= 0 && mtu > 0) {
3755 link->mtu = mtu;
3756 if (link->original_mtu == 0) {
3757 link->original_mtu = mtu;
3758 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3759 }
3760
3761 if (link->dhcp_client) {
3762 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3763 link->mtu);
3764 if (r < 0)
3765 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3766 }
3767
3768 if (link->radv) {
3769 r = sd_radv_set_mtu(link->radv, link->mtu);
3770 if (r < 0)
3771 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3772 }
3773 }
3774
3775 /* The kernel may broadcast NEWLINK messages without the MAC address
3776 set, simply ignore them. */
3777 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3778 if (r >= 0) {
3779 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3780 ETH_ALEN)) {
3781
3782 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3783 ETH_ALEN);
3784
3785 log_link_debug(link, "MAC address: "
3786 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3787 mac.ether_addr_octet[0],
3788 mac.ether_addr_octet[1],
3789 mac.ether_addr_octet[2],
3790 mac.ether_addr_octet[3],
3791 mac.ether_addr_octet[4],
3792 mac.ether_addr_octet[5]);
3793
3794 if (link->ipv4ll) {
3795 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3796 if (r < 0)
3797 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3798 }
3799
3800 if (link->dhcp_client) {
3801 r = sd_dhcp_client_set_mac(link->dhcp_client,
3802 (const uint8_t *) &link->mac,
3803 sizeof (link->mac),
3804 ARPHRD_ETHER);
3805 if (r < 0)
3806 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3807
3808 r = dhcp4_set_client_identifier(link);
3809 if (r < 0)
3810 return r;
3811 }
3812
3813 if (link->dhcp6_client) {
3814 const DUID* duid = link_get_duid(link);
3815
3816 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3817 (const uint8_t *) &link->mac,
3818 sizeof (link->mac),
3819 ARPHRD_ETHER);
3820 if (r < 0)
3821 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3822
3823 if (link->network->iaid_set) {
3824 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3825 link->network->iaid);
3826 if (r < 0)
3827 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3828 }
3829
3830 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3831 duid->type,
3832 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3833 duid->raw_data_len);
3834 if (r < 0)
3835 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3836 }
3837
3838 if (link->radv) {
3839 r = sd_radv_set_mac(link->radv, &link->mac);
3840 if (r < 0)
3841 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3842 }
3843
3844 if (link->ndisc) {
3845 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3846 if (r < 0)
3847 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3848 }
3849 }
3850 }
3851
3852 had_carrier = link_has_carrier(link);
3853
3854 r = link_update_flags(link, m);
3855 if (r < 0)
3856 return r;
3857
3858 r = link_update_lldp(link);
3859 if (r < 0)
3860 return r;
3861
3862 carrier_gained = !had_carrier && link_has_carrier(link);
3863 carrier_lost = had_carrier && !link_has_carrier(link);
3864
3865 if (carrier_gained) {
3866 log_link_info(link, "Gained carrier");
3867
3868 r = link_carrier_gained(link);
3869 if (r < 0)
3870 return r;
3871 } else if (carrier_lost) {
3872 log_link_info(link, "Lost carrier");
3873
3874 r = link_carrier_lost(link);
3875 if (r < 0)
3876 return r;
3877 }
3878
3879 return 0;
3880 }
3881
3882 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3883 bool space = false;
3884 Iterator i;
3885 Link *link;
3886
3887 assert(f);
3888 assert(prefix);
3889
3890 if (hashmap_isempty(h))
3891 return;
3892
3893 fputs(prefix, f);
3894 HASHMAP_FOREACH(link, h, i) {
3895 if (space)
3896 fputc(' ', f);
3897
3898 fprintf(f, "%i", link->ifindex);
3899 space = true;
3900 }
3901
3902 fputc('\n', f);
3903 }
3904
3905 int link_save(Link *link) {
3906 _cleanup_free_ char *temp_path = NULL;
3907 _cleanup_fclose_ FILE *f = NULL;
3908 const char *admin_state, *oper_state;
3909 Address *a;
3910 Route *route;
3911 Iterator i;
3912 int r;
3913
3914 assert(link);
3915 assert(link->state_file);
3916 assert(link->lease_file);
3917 assert(link->manager);
3918
3919 if (link->state == LINK_STATE_LINGER) {
3920 unlink(link->state_file);
3921 return 0;
3922 }
3923
3924 link_lldp_save(link);
3925
3926 admin_state = link_state_to_string(link->state);
3927 assert(admin_state);
3928
3929 oper_state = link_operstate_to_string(link->operstate);
3930 assert(oper_state);
3931
3932 r = fopen_temporary(link->state_file, &f, &temp_path);
3933 if (r < 0)
3934 goto fail;
3935
3936 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
3937 (void) fchmod(fileno(f), 0644);
3938
3939 fprintf(f,
3940 "# This is private data. Do not parse.\n"
3941 "ADMIN_STATE=%s\n"
3942 "OPER_STATE=%s\n",
3943 admin_state, oper_state);
3944
3945 if (link->network) {
3946 bool space;
3947 sd_dhcp6_lease *dhcp6_lease = NULL;
3948 const char *dhcp_domainname = NULL;
3949 char **dhcp6_domains = NULL;
3950 char **dhcp_domains = NULL;
3951 unsigned j;
3952
3953 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3954 yes_no(link->network->required_for_online));
3955
3956 if (link->dhcp6_client) {
3957 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3958 if (r < 0 && r != -ENOMSG)
3959 log_link_debug(link, "No DHCPv6 lease");
3960 }
3961
3962 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3963
3964 fputs("DNS=", f);
3965 space = false;
3966
3967 for (j = 0; j < link->network->n_dns; j++) {
3968 _cleanup_free_ char *b = NULL;
3969
3970 r = in_addr_to_string(link->network->dns[j].family,
3971 &link->network->dns[j].address, &b);
3972 if (r < 0) {
3973 log_debug_errno(r, "Failed to format address, ignoring: %m");
3974 continue;
3975 }
3976
3977 if (space)
3978 fputc(' ', f);
3979 fputs(b, f);
3980 space = true;
3981 }
3982
3983 if (link->network->dhcp_use_dns &&
3984 link->dhcp_lease) {
3985 const struct in_addr *addresses;
3986
3987 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3988 if (r > 0) {
3989 if (space)
3990 fputc(' ', f);
3991 serialize_in_addrs(f, addresses, r);
3992 space = true;
3993 }
3994 }
3995
3996 if (link->network->dhcp_use_dns && dhcp6_lease) {
3997 struct in6_addr *in6_addrs;
3998
3999 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
4000 if (r > 0) {
4001 if (space)
4002 fputc(' ', f);
4003 serialize_in6_addrs(f, in6_addrs, r);
4004 space = true;
4005 }
4006 }
4007
4008 /* Make sure to flush out old entries before we use the NDISC data */
4009 ndisc_vacuum(link);
4010
4011 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4012 NDiscRDNSS *dd;
4013
4014 SET_FOREACH(dd, link->ndisc_rdnss, i) {
4015 if (space)
4016 fputc(' ', f);
4017
4018 serialize_in6_addrs(f, &dd->address, 1);
4019 space = true;
4020 }
4021 }
4022
4023 fputc('\n', f);
4024
4025 fputs("NTP=", f);
4026 space = false;
4027 fputstrv(f, link->network->ntp, NULL, &space);
4028
4029 if (link->network->dhcp_use_ntp &&
4030 link->dhcp_lease) {
4031 const struct in_addr *addresses;
4032
4033 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
4034 if (r > 0) {
4035 if (space)
4036 fputc(' ', f);
4037 serialize_in_addrs(f, addresses, r);
4038 space = true;
4039 }
4040 }
4041
4042 if (link->network->dhcp_use_ntp && dhcp6_lease) {
4043 struct in6_addr *in6_addrs;
4044 char **hosts;
4045
4046 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
4047 &in6_addrs);
4048 if (r > 0) {
4049 if (space)
4050 fputc(' ', f);
4051 serialize_in6_addrs(f, in6_addrs, r);
4052 space = true;
4053 }
4054
4055 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
4056 if (r > 0)
4057 fputstrv(f, hosts, NULL, &space);
4058 }
4059
4060 fputc('\n', f);
4061
4062 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4063 if (link->dhcp_lease) {
4064 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4065 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4066 }
4067 if (dhcp6_lease)
4068 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4069 }
4070
4071 fputs("DOMAINS=", f);
4072 space = false;
4073 fputstrv(f, link->network->search_domains, NULL, &space);
4074
4075 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4076 NDiscDNSSL *dd;
4077
4078 if (dhcp_domainname)
4079 fputs_with_space(f, dhcp_domainname, NULL, &space);
4080 if (dhcp_domains)
4081 fputstrv(f, dhcp_domains, NULL, &space);
4082 if (dhcp6_domains)
4083 fputstrv(f, dhcp6_domains, NULL, &space);
4084
4085 SET_FOREACH(dd, link->ndisc_dnssl, i)
4086 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4087 }
4088
4089 fputc('\n', f);
4090
4091 fputs("ROUTE_DOMAINS=", f);
4092 space = false;
4093 fputstrv(f, link->network->route_domains, NULL, &space);
4094
4095 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4096 NDiscDNSSL *dd;
4097
4098 if (dhcp_domainname)
4099 fputs_with_space(f, dhcp_domainname, NULL, &space);
4100 if (dhcp_domains)
4101 fputstrv(f, dhcp_domains, NULL, &space);
4102 if (dhcp6_domains)
4103 fputstrv(f, dhcp6_domains, NULL, &space);
4104
4105 SET_FOREACH(dd, link->ndisc_dnssl, i)
4106 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4107 }
4108
4109 fputc('\n', f);
4110
4111 fprintf(f, "LLMNR=%s\n",
4112 resolve_support_to_string(link->network->llmnr));
4113 fprintf(f, "MDNS=%s\n",
4114 resolve_support_to_string(link->network->mdns));
4115 if (link->network->dns_default_route >= 0)
4116 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
4117
4118 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4119 fprintf(f, "DNS_OVER_TLS=%s\n",
4120 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
4121
4122 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
4123 fprintf(f, "DNSSEC=%s\n",
4124 dnssec_mode_to_string(link->network->dnssec_mode));
4125
4126 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
4127 const char *n;
4128
4129 fputs("DNSSEC_NTA=", f);
4130 space = false;
4131 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
4132 fputs_with_space(f, n, NULL, &space);
4133 fputc('\n', f);
4134 }
4135
4136 fputs("ADDRESSES=", f);
4137 space = false;
4138 SET_FOREACH(a, link->addresses, i) {
4139 _cleanup_free_ char *address_str = NULL;
4140
4141 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4142 if (r < 0)
4143 goto fail;
4144
4145 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4146 space = true;
4147 }
4148 fputc('\n', f);
4149
4150 fputs("ROUTES=", f);
4151 space = false;
4152 SET_FOREACH(route, link->routes, i) {
4153 _cleanup_free_ char *route_str = NULL;
4154
4155 r = in_addr_to_string(route->family, &route->dst, &route_str);
4156 if (r < 0)
4157 goto fail;
4158
4159 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4160 space ? " " : "", route_str,
4161 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4162 space = true;
4163 }
4164
4165 fputc('\n', f);
4166 }
4167
4168 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4169 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4170
4171 if (link->dhcp_lease) {
4172 struct in_addr address;
4173 const char *tz = NULL;
4174
4175 assert(link->network);
4176
4177 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
4178 if (r >= 0)
4179 fprintf(f, "TIMEZONE=%s\n", tz);
4180
4181 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
4182 if (r >= 0) {
4183 fputs("DHCP4_ADDRESS=", f);
4184 serialize_in_addrs(f, &address, 1);
4185 fputc('\n', f);
4186 }
4187
4188 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4189 if (r < 0)
4190 goto fail;
4191
4192 fprintf(f,
4193 "DHCP_LEASE=%s\n",
4194 link->lease_file);
4195 } else
4196 unlink(link->lease_file);
4197
4198 if (link->ipv4ll) {
4199 struct in_addr address;
4200
4201 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4202 if (r >= 0) {
4203 fputs("IPV4LL_ADDRESS=", f);
4204 serialize_in_addrs(f, &address, 1);
4205 fputc('\n', f);
4206 }
4207 }
4208
4209 r = fflush_and_check(f);
4210 if (r < 0)
4211 goto fail;
4212
4213 if (rename(temp_path, link->state_file) < 0) {
4214 r = -errno;
4215 goto fail;
4216 }
4217
4218 return 0;
4219
4220 fail:
4221 (void) unlink(link->state_file);
4222 if (temp_path)
4223 (void) unlink(temp_path);
4224
4225 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4226 }
4227
4228 /* The serialized state in /run is no longer up-to-date. */
4229 void link_dirty(Link *link) {
4230 int r;
4231
4232 assert(link);
4233
4234 /* mark manager dirty as link is dirty */
4235 manager_dirty(link->manager);
4236
4237 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
4238 if (r < 0)
4239 /* allocation errors are ignored */
4240 return;
4241
4242 r = set_put(link->manager->dirty_links, link);
4243 if (r <= 0)
4244 /* don't take another ref if the link was already dirty */
4245 return;
4246
4247 link_ref(link);
4248 }
4249
4250 /* The serialized state in /run is up-to-date */
4251 void link_clean(Link *link) {
4252 assert(link);
4253 assert(link->manager);
4254
4255 link_unref(set_remove(link->manager->dirty_links, link));
4256 }
4257
4258 static const char* const link_state_table[_LINK_STATE_MAX] = {
4259 [LINK_STATE_PENDING] = "pending",
4260 [LINK_STATE_CONFIGURING] = "configuring",
4261 [LINK_STATE_CONFIGURED] = "configured",
4262 [LINK_STATE_UNMANAGED] = "unmanaged",
4263 [LINK_STATE_FAILED] = "failed",
4264 [LINK_STATE_LINGER] = "linger",
4265 };
4266
4267 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
4268
4269 static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
4270 [LINK_OPERSTATE_OFF] = "off",
4271 [LINK_OPERSTATE_NO_CARRIER] = "no-carrier",
4272 [LINK_OPERSTATE_DORMANT] = "dormant",
4273 [LINK_OPERSTATE_CARRIER] = "carrier",
4274 [LINK_OPERSTATE_DEGRADED] = "degraded",
4275 [LINK_OPERSTATE_ENSLAVED] = "enslaved",
4276 [LINK_OPERSTATE_ROUTABLE] = "routable",
4277 };
4278
4279 DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
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