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Merge pull request #11729 from yuwata/fix-11721
[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 "netdev/vrf.h"
18 #include "netlink-util.h"
19 #include "network-internal.h"
20 #include "networkd-ipv6-proxy-ndp.h"
21 #include "networkd-lldp-tx.h"
22 #include "networkd-manager.h"
23 #include "networkd-ndisc.h"
24 #include "networkd-neighbor.h"
25 #include "networkd-radv.h"
26 #include "networkd-routing-policy-rule.h"
27 #include "set.h"
28 #include "socket-util.h"
29 #include "stdio-util.h"
30 #include "string-table.h"
31 #include "strv.h"
32 #include "tmpfile-util.h"
33 #include "util.h"
34 #include "virt.h"
35
36 uint32_t link_get_vrf_table(Link *link) {
37 return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
38 }
39
40 uint32_t link_get_dhcp_route_table(Link *link) {
41 /* When the interface is part of an VRF use the VRFs routing table, unless
42 * another table is explicitly specified. */
43 if (link->network->dhcp_route_table_set)
44 return link->network->dhcp_route_table;
45 return link_get_vrf_table(link);
46 }
47
48 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
49 if (link->network->ipv6_accept_ra_route_table_set)
50 return link->network->ipv6_accept_ra_route_table;
51 return link_get_vrf_table(link);
52 }
53
54 DUID* link_get_duid(Link *link) {
55 if (link->network->duid.type != _DUID_TYPE_INVALID)
56 return &link->network->duid;
57 else
58 return &link->manager->duid;
59 }
60
61 static bool link_dhcp6_enabled(Link *link) {
62 assert(link);
63
64 if (!socket_ipv6_is_supported())
65 return false;
66
67 if (link->flags & IFF_LOOPBACK)
68 return false;
69
70 if (!link->network)
71 return false;
72
73 if (link->network->bond)
74 return false;
75
76 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
77 }
78
79 static bool link_dhcp4_enabled(Link *link) {
80 assert(link);
81
82 if (link->flags & IFF_LOOPBACK)
83 return false;
84
85 if (!link->network)
86 return false;
87
88 if (link->network->bond)
89 return false;
90
91 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
92 }
93
94 static bool link_dhcp4_server_enabled(Link *link) {
95 assert(link);
96
97 if (link->flags & IFF_LOOPBACK)
98 return false;
99
100 if (!link->network)
101 return false;
102
103 if (link->network->bond)
104 return false;
105
106 return link->network->dhcp_server;
107 }
108
109 static bool link_ipv4ll_enabled(Link *link) {
110 assert(link);
111
112 if (link->flags & IFF_LOOPBACK)
113 return false;
114
115 if (!link->network)
116 return false;
117
118 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard"))
119 return false;
120
121 if (link->network->bond)
122 return false;
123
124 return link->network->link_local & ADDRESS_FAMILY_IPV4;
125 }
126
127 static bool link_ipv6ll_enabled(Link *link) {
128 assert(link);
129
130 if (!socket_ipv6_is_supported())
131 return false;
132
133 if (link->flags & IFF_LOOPBACK)
134 return false;
135
136 if (!link->network)
137 return false;
138
139 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard"))
140 return false;
141
142 if (link->network->bond)
143 return false;
144
145 return link->network->link_local & ADDRESS_FAMILY_IPV6;
146 }
147
148 static bool link_ipv6_enabled(Link *link) {
149 assert(link);
150
151 if (!socket_ipv6_is_supported())
152 return false;
153
154 if (link->network->bridge || link->network->bond)
155 return false;
156
157 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
158 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
159 }
160
161 static bool link_radv_enabled(Link *link) {
162 assert(link);
163
164 if (!link_ipv6ll_enabled(link))
165 return false;
166
167 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
168 }
169
170 static bool link_lldp_rx_enabled(Link *link) {
171 assert(link);
172
173 if (link->flags & IFF_LOOPBACK)
174 return false;
175
176 if (link->iftype != ARPHRD_ETHER)
177 return false;
178
179 if (!link->network)
180 return false;
181
182 /* LLDP should be handled on bridge slaves as those have a direct
183 * connection to their peers not on the bridge master. Linux doesn't
184 * even (by default) forward lldp packets to the bridge master.*/
185 if (streq_ptr("bridge", link->kind))
186 return false;
187
188 return link->network->lldp_mode != LLDP_MODE_NO;
189 }
190
191 static bool link_lldp_emit_enabled(Link *link) {
192 assert(link);
193
194 if (link->flags & IFF_LOOPBACK)
195 return false;
196
197 if (link->iftype != ARPHRD_ETHER)
198 return false;
199
200 if (!link->network)
201 return false;
202
203 return link->network->lldp_emit != LLDP_EMIT_NO;
204 }
205
206 static bool link_ipv4_forward_enabled(Link *link) {
207 assert(link);
208
209 if (link->flags & IFF_LOOPBACK)
210 return false;
211
212 if (!link->network)
213 return false;
214
215 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
216 return false;
217
218 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
219 }
220
221 static bool link_ipv6_forward_enabled(Link *link) {
222 assert(link);
223
224 if (!socket_ipv6_is_supported())
225 return false;
226
227 if (link->flags & IFF_LOOPBACK)
228 return false;
229
230 if (!link->network)
231 return false;
232
233 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
234 return false;
235
236 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
237 }
238
239 static bool link_proxy_arp_enabled(Link *link) {
240 assert(link);
241
242 if (link->flags & IFF_LOOPBACK)
243 return false;
244
245 if (!link->network)
246 return false;
247
248 if (link->network->proxy_arp < 0)
249 return false;
250
251 return true;
252 }
253
254 static bool link_ipv6_accept_ra_enabled(Link *link) {
255 assert(link);
256
257 if (!socket_ipv6_is_supported())
258 return false;
259
260 if (link->flags & IFF_LOOPBACK)
261 return false;
262
263 if (!link->network)
264 return false;
265
266 if (!link_ipv6ll_enabled(link))
267 return false;
268
269 /* If unset use system default (enabled if local forwarding is disabled.
270 * disabled if local forwarding is enabled).
271 * If set, ignore or enforce RA independent of local forwarding state.
272 */
273 if (link->network->ipv6_accept_ra < 0)
274 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
275 return !link_ipv6_forward_enabled(link);
276 else if (link->network->ipv6_accept_ra > 0)
277 /* accept RA even if ip_forward is enabled */
278 return true;
279 else
280 /* ignore RA */
281 return false;
282 }
283
284 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
285 assert(link);
286
287 if (!socket_ipv6_is_supported())
288 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
289
290 if (link->flags & IFF_LOOPBACK)
291 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
292
293 if (!link->network)
294 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
295
296 return link->network->ipv6_privacy_extensions;
297 }
298
299 static int link_enable_ipv6(Link *link) {
300 const char *p = NULL;
301 bool disabled;
302 int r;
303
304 if (link->flags & IFF_LOOPBACK)
305 return 0;
306
307 disabled = !link_ipv6_enabled(link);
308
309 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/disable_ipv6");
310
311 r = write_string_file(p, one_zero(disabled), WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
312 if (r < 0)
313 log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m",
314 enable_disable(!disabled), link->ifname);
315 else
316 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
317
318 return 0;
319 }
320
321 void link_update_operstate(Link *link, bool also_update_bond_master) {
322 LinkOperationalState operstate;
323
324 assert(link);
325
326 if (link->kernel_operstate == IF_OPER_DORMANT)
327 operstate = LINK_OPERSTATE_DORMANT;
328 else if (link_has_carrier(link)) {
329 Address *address;
330 uint8_t scope = RT_SCOPE_NOWHERE;
331 Iterator i;
332
333 /* if we have carrier, check what addresses we have */
334 SET_FOREACH(address, link->addresses, i) {
335 if (!address_is_ready(address))
336 continue;
337
338 if (address->scope < scope)
339 scope = address->scope;
340 }
341
342 /* for operstate we also take foreign addresses into account */
343 SET_FOREACH(address, link->addresses_foreign, i) {
344 if (!address_is_ready(address))
345 continue;
346
347 if (address->scope < scope)
348 scope = address->scope;
349 }
350
351 if (scope < RT_SCOPE_SITE)
352 /* universally accessible addresses found */
353 operstate = LINK_OPERSTATE_ROUTABLE;
354 else if (scope < RT_SCOPE_HOST)
355 /* only link or site local addresses found */
356 operstate = LINK_OPERSTATE_DEGRADED;
357 else
358 /* no useful addresses found */
359 operstate = LINK_OPERSTATE_CARRIER;
360 } else if (link->flags & IFF_UP)
361 operstate = LINK_OPERSTATE_NO_CARRIER;
362 else
363 operstate = LINK_OPERSTATE_OFF;
364
365 if (IN_SET(operstate, LINK_OPERSTATE_DEGRADED, LINK_OPERSTATE_CARRIER) &&
366 link->flags & IFF_SLAVE)
367 operstate = LINK_OPERSTATE_ENSLAVED;
368
369 if (IN_SET(operstate, LINK_OPERSTATE_CARRIER, LINK_OPERSTATE_ENSLAVED, LINK_OPERSTATE_ROUTABLE) &&
370 !hashmap_isempty(link->bond_slaves)) {
371 Iterator i;
372 Link *slave;
373
374 HASHMAP_FOREACH(slave, link->bond_slaves, i) {
375 link_update_operstate(slave, false);
376
377 if (IN_SET(slave->operstate,
378 LINK_OPERSTATE_OFF, LINK_OPERSTATE_NO_CARRIER, LINK_OPERSTATE_DORMANT))
379 operstate = LINK_OPERSTATE_DEGRADED;
380 }
381 }
382
383 if (link->operstate != operstate) {
384 link->operstate = operstate;
385 link_send_changed(link, "OperationalState", NULL);
386 link_dirty(link);
387 }
388
389 if (also_update_bond_master && link->network && link->network->bond) {
390 Link *master;
391
392 if (link_get(link->manager, link->network->bond->ifindex, &master) < 0)
393 return;
394
395 link_update_operstate(master, true);
396 }
397 }
398
399 #define FLAG_STRING(string, flag, old, new) \
400 (((old ^ new) & flag) \
401 ? ((old & flag) ? (" -" string) : (" +" string)) \
402 : "")
403
404 static int link_update_flags(Link *link, sd_netlink_message *m) {
405 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
406 uint8_t operstate;
407 int r;
408
409 assert(link);
410
411 r = sd_rtnl_message_link_get_flags(m, &flags);
412 if (r < 0)
413 return log_link_warning_errno(link, r, "Could not get link flags: %m");
414
415 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
416 if (r < 0)
417 /* if we got a message without operstate, take it to mean
418 the state was unchanged */
419 operstate = link->kernel_operstate;
420
421 if ((link->flags == flags) && (link->kernel_operstate == operstate))
422 return 0;
423
424 if (link->flags != flags) {
425 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",
426 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
427 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
428 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
429 FLAG_STRING("UP", IFF_UP, link->flags, flags),
430 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
431 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
432 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
433 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
434 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
435 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
436 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
437 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
438 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
439 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
440 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
441 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
442 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
443 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
444 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
445
446 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
447 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
448 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
449 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
450 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
451 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
452 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
453 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
454
455 /* link flags are currently at most 18 bits, let's align to
456 * printing 20 */
457 if (unknown_flags_added)
458 log_link_debug(link,
459 "Unknown link flags gained: %#.5x (ignoring)",
460 unknown_flags_added);
461
462 if (unknown_flags_removed)
463 log_link_debug(link,
464 "Unknown link flags lost: %#.5x (ignoring)",
465 unknown_flags_removed);
466 }
467
468 link->flags = flags;
469 link->kernel_operstate = operstate;
470
471 link_update_operstate(link, true);
472
473 return 0;
474 }
475
476 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_unref);
477
478 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
479 _cleanup_(link_unrefp) Link *link = NULL;
480 uint16_t type;
481 const char *ifname, *kind = NULL;
482 int r, ifindex;
483 unsigned short iftype;
484
485 assert(manager);
486 assert(message);
487 assert(ret);
488
489 /* check for link kind */
490 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
491 if (r == 0) {
492 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
493 r = sd_netlink_message_exit_container(message);
494 if (r < 0)
495 return r;
496 }
497
498 r = sd_netlink_message_get_type(message, &type);
499 if (r < 0)
500 return r;
501 else if (type != RTM_NEWLINK)
502 return -EINVAL;
503
504 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
505 if (r < 0)
506 return r;
507 else if (ifindex <= 0)
508 return -EINVAL;
509
510 r = sd_rtnl_message_link_get_type(message, &iftype);
511 if (r < 0)
512 return r;
513
514 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
515 if (r < 0)
516 return r;
517
518 link = new(Link, 1);
519 if (!link)
520 return -ENOMEM;
521
522 *link = (Link) {
523 .n_ref = 1,
524 .manager = manager,
525 .state = LINK_STATE_PENDING,
526 .rtnl_extended_attrs = true,
527 .ifindex = ifindex,
528 .iftype = iftype,
529 };
530
531 link->ifname = strdup(ifname);
532 if (!link->ifname)
533 return -ENOMEM;
534
535 if (kind) {
536 link->kind = strdup(kind);
537 if (!link->kind)
538 return -ENOMEM;
539 }
540
541 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
542 if (r < 0)
543 log_link_debug_errno(link, r, "New device has no master, continuing without");
544
545 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
546 if (r < 0)
547 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
548
549 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
550 return -ENOMEM;
551
552 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
553 return -ENOMEM;
554
555 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
556 return -ENOMEM;
557
558 r = hashmap_ensure_allocated(&manager->links, NULL);
559 if (r < 0)
560 return r;
561
562 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
563 if (r < 0)
564 return r;
565
566 r = link_update_flags(link, message);
567 if (r < 0)
568 return r;
569
570 *ret = TAKE_PTR(link);
571
572 return 0;
573 }
574
575 static void link_detach_from_manager(Link *link) {
576 if (!link || !link->manager)
577 return;
578
579 hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex));
580 set_remove(link->manager->links_requesting_uuid, link);
581 link_clean(link);
582 }
583
584 static Link *link_free(Link *link) {
585 Address *address;
586 Link *carrier;
587 Route *route;
588 Iterator i;
589
590 assert(link);
591
592 while ((route = set_first(link->routes)))
593 route_free(route);
594
595 while ((route = set_first(link->routes_foreign)))
596 route_free(route);
597
598 link->routes = set_free(link->routes);
599 link->routes_foreign = set_free(link->routes_foreign);
600
601 while ((address = set_first(link->addresses)))
602 address_free(address);
603
604 while ((address = set_first(link->addresses_foreign)))
605 address_free(address);
606
607 link->addresses = set_free(link->addresses);
608 link->addresses_foreign = set_free(link->addresses_foreign);
609
610 while ((address = link->pool_addresses)) {
611 LIST_REMOVE(addresses, link->pool_addresses, address);
612 address_free(address);
613 }
614
615 sd_dhcp_server_unref(link->dhcp_server);
616 sd_dhcp_client_unref(link->dhcp_client);
617 sd_dhcp_lease_unref(link->dhcp_lease);
618
619 link_lldp_emit_stop(link);
620
621 free(link->lease_file);
622
623 sd_lldp_unref(link->lldp);
624 free(link->lldp_file);
625
626 ndisc_flush(link);
627
628 sd_ipv4ll_unref(link->ipv4ll);
629 sd_dhcp6_client_unref(link->dhcp6_client);
630 sd_ndisc_unref(link->ndisc);
631 sd_radv_unref(link->radv);
632
633 link_detach_from_manager(link);
634
635 free(link->ifname);
636
637 free(link->kind);
638
639 (void) unlink(link->state_file);
640 free(link->state_file);
641
642 sd_device_unref(link->sd_device);
643
644 HASHMAP_FOREACH (carrier, link->bound_to_links, i)
645 hashmap_remove(link->bound_to_links, INT_TO_PTR(carrier->ifindex));
646 hashmap_free(link->bound_to_links);
647
648 HASHMAP_FOREACH (carrier, link->bound_by_links, i)
649 hashmap_remove(link->bound_by_links, INT_TO_PTR(carrier->ifindex));
650 hashmap_free(link->bound_by_links);
651
652 hashmap_free(link->bond_slaves);
653
654 return mfree(link);
655 }
656
657 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
658
659 int link_get(Manager *m, int ifindex, Link **ret) {
660 Link *link;
661
662 assert(m);
663 assert(ifindex);
664 assert(ret);
665
666 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
667 if (!link)
668 return -ENODEV;
669
670 *ret = link;
671
672 return 0;
673 }
674
675 static void link_set_state(Link *link, LinkState state) {
676 assert(link);
677
678 if (link->state == state)
679 return;
680
681 link->state = state;
682
683 link_send_changed(link, "AdministrativeState", NULL);
684 }
685
686 static void link_enter_unmanaged(Link *link) {
687 assert(link);
688
689 log_link_debug(link, "Unmanaged");
690
691 link_set_state(link, LINK_STATE_UNMANAGED);
692
693 link_dirty(link);
694 }
695
696 static int link_stop_clients(Link *link) {
697 int r = 0, k;
698
699 assert(link);
700 assert(link->manager);
701 assert(link->manager->event);
702
703 if (link->dhcp_client) {
704 k = sd_dhcp_client_stop(link->dhcp_client);
705 if (k < 0)
706 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
707 }
708
709 if (link->ipv4ll) {
710 k = sd_ipv4ll_stop(link->ipv4ll);
711 if (k < 0)
712 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
713 }
714
715 if (link->dhcp6_client) {
716 k = sd_dhcp6_client_stop(link->dhcp6_client);
717 if (k < 0)
718 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
719 }
720
721 if (link->ndisc) {
722 k = sd_ndisc_stop(link->ndisc);
723 if (k < 0)
724 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
725 }
726
727 if (link->radv) {
728 k = sd_radv_stop(link->radv);
729 if (k < 0)
730 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
731 }
732
733 link_lldp_emit_stop(link);
734 return r;
735 }
736
737 void link_enter_failed(Link *link) {
738 assert(link);
739
740 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
741 return;
742
743 log_link_warning(link, "Failed");
744
745 link_set_state(link, LINK_STATE_FAILED);
746
747 link_stop_clients(link);
748
749 link_dirty(link);
750 }
751
752 static Address* link_find_dhcp_server_address(Link *link) {
753 Address *address;
754
755 assert(link);
756 assert(link->network);
757
758 /* The first statically configured address if there is any */
759 LIST_FOREACH(addresses, address, link->network->static_addresses) {
760
761 if (address->family != AF_INET)
762 continue;
763
764 if (in_addr_is_null(address->family, &address->in_addr))
765 continue;
766
767 return address;
768 }
769
770 /* If that didn't work, find a suitable address we got from the pool */
771 LIST_FOREACH(addresses, address, link->pool_addresses) {
772 if (address->family != AF_INET)
773 continue;
774
775 return address;
776 }
777
778 return NULL;
779 }
780
781 static void link_enter_configured(Link *link) {
782 assert(link);
783 assert(link->network);
784
785 if (link->state != LINK_STATE_CONFIGURING)
786 return;
787
788 log_link_info(link, "Configured");
789
790 link_set_state(link, LINK_STATE_CONFIGURED);
791
792 link_dirty(link);
793 }
794
795 static int link_request_set_routing_policy_rule(Link *link) {
796 RoutingPolicyRule *rule, *rrule = NULL;
797 int r;
798
799 assert(link);
800 assert(link->network);
801
802 link_set_state(link, LINK_STATE_CONFIGURING);
803 link->routing_policy_rules_configured = false;
804
805 LIST_FOREACH(rules, rule, link->network->rules) {
806 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
807 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif,
808 rule->protocol, &rule->sport, &rule->dport, &rrule);
809 if (r == 0) {
810 (void) routing_policy_rule_make_local(link->manager, rrule);
811 continue;
812 }
813
814 r = routing_policy_rule_configure(rule, link, NULL, false);
815 if (r < 0) {
816 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
817 link_enter_failed(link);
818 return r;
819 }
820
821 link->routing_policy_rule_messages++;
822 }
823
824 routing_policy_rule_purge(link->manager, link);
825 if (link->routing_policy_rule_messages == 0) {
826 link->routing_policy_rules_configured = true;
827 link_check_ready(link);
828 } else
829 log_link_debug(link, "Setting routing policy rules");
830
831 return 0;
832 }
833
834 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
835 int r;
836
837 assert(link);
838 assert(link->route_messages > 0);
839 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
840 LINK_STATE_FAILED, LINK_STATE_LINGER));
841
842 link->route_messages--;
843
844 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
845 return 1;
846
847 r = sd_netlink_message_get_errno(m);
848 if (r < 0 && r != -EEXIST)
849 log_link_warning_errno(link, r, "Could not set route: %m");
850
851 if (link->route_messages == 0) {
852 log_link_debug(link, "Routes set");
853 link->static_routes_configured = true;
854 link_check_ready(link);
855 }
856
857 return 1;
858 }
859
860 static int link_request_set_routes(Link *link) {
861 enum {
862 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
863 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
864 _PHASE_MAX
865 } phase;
866 Route *rt;
867 int r;
868
869 assert(link);
870 assert(link->network);
871 assert(link->addresses_configured);
872 assert(link->address_messages == 0);
873 assert(link->state != _LINK_STATE_INVALID);
874
875 link_set_state(link, LINK_STATE_CONFIGURING);
876 link->static_routes_configured = false;
877
878 r = link_request_set_routing_policy_rule(link);
879 if (r < 0)
880 return r;
881
882 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
883 for (phase = 0; phase < _PHASE_MAX; phase++)
884 LIST_FOREACH(routes, rt, link->network->static_routes) {
885
886 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
887 continue;
888
889 r = route_configure(rt, link, route_handler);
890 if (r < 0) {
891 log_link_warning_errno(link, r, "Could not set routes: %m");
892 link_enter_failed(link);
893 return r;
894 }
895
896 link->route_messages++;
897 }
898
899 if (link->route_messages == 0) {
900 link->static_routes_configured = true;
901 link_check_ready(link);
902 } else
903 log_link_debug(link, "Setting routes");
904
905 return 0;
906 }
907
908 void link_check_ready(Link *link) {
909 Address *a;
910 Iterator i;
911
912 assert(link);
913
914 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
915 return;
916
917 if (!link->network)
918 return;
919
920 if (!link->addresses_configured)
921 return;
922
923 if (!link->neighbors_configured)
924 return;
925
926 SET_FOREACH(a, link->addresses, i)
927 if (!address_is_ready(a))
928 return;
929
930 if (!link->addresses_ready) {
931 link->addresses_ready = true;
932 link_request_set_routes(link);
933 }
934
935 if (!link->static_routes_configured)
936 return;
937
938 if (!link->routing_policy_rules_configured)
939 return;
940
941 if (link_ipv4ll_enabled(link))
942 if (!link->ipv4ll_address ||
943 !link->ipv4ll_route)
944 return;
945
946 if (!link->network->bridge) {
947
948 if (link_ipv6ll_enabled(link) &&
949 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
950 return;
951
952 if ((link_dhcp4_enabled(link) && !link_dhcp6_enabled(link) &&
953 !link->dhcp4_configured) ||
954 (link_dhcp6_enabled(link) && !link_dhcp4_enabled(link) &&
955 !link->dhcp6_configured) ||
956 (link_dhcp4_enabled(link) && link_dhcp6_enabled(link) &&
957 !link->dhcp4_configured && !link->dhcp6_configured))
958 return;
959
960 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
961 return;
962 }
963
964 if (link->state != LINK_STATE_CONFIGURED)
965 link_enter_configured(link);
966
967 return;
968 }
969
970 static int link_request_set_neighbors(Link *link) {
971 Neighbor *neighbor;
972 int r;
973
974 assert(link);
975 assert(link->network);
976 assert(link->state != _LINK_STATE_INVALID);
977
978 link_set_state(link, LINK_STATE_CONFIGURING);
979 link->neighbors_configured = false;
980
981 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
982 r = neighbor_configure(neighbor, link, NULL);
983 if (r < 0) {
984 log_link_warning_errno(link, r, "Could not set neighbor: %m");
985 link_enter_failed(link);
986 return r;
987 }
988 }
989
990 if (link->neighbor_messages == 0) {
991 link->neighbors_configured = true;
992 link_check_ready(link);
993 } else
994 log_link_debug(link, "Setting neighbors");
995
996 return 0;
997 }
998
999 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1000 int r;
1001
1002 assert(rtnl);
1003 assert(m);
1004 assert(link);
1005 assert(link->ifname);
1006 assert(link->address_messages > 0);
1007 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1008 LINK_STATE_FAILED, LINK_STATE_LINGER));
1009
1010 link->address_messages--;
1011
1012 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1013 return 1;
1014
1015 r = sd_netlink_message_get_errno(m);
1016 if (r < 0 && r != -EEXIST)
1017 log_link_warning_errno(link, r, "could not set address: %m");
1018 else if (r >= 0)
1019 manager_rtnl_process_address(rtnl, m, link->manager);
1020
1021 if (link->address_messages == 0) {
1022 log_link_debug(link, "Addresses set");
1023 link->addresses_configured = true;
1024 link_check_ready(link);
1025 }
1026
1027 return 1;
1028 }
1029
1030 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1031 _cleanup_free_ struct in_addr *addresses = NULL;
1032 size_t n_addresses = 0, n_allocated = 0;
1033 unsigned i;
1034
1035 log_debug("Copying DNS server information from %s", link->ifname);
1036
1037 if (!link->network)
1038 return 0;
1039
1040 for (i = 0; i < link->network->n_dns; i++) {
1041 struct in_addr ia;
1042
1043 /* Only look for IPv4 addresses */
1044 if (link->network->dns[i].family != AF_INET)
1045 continue;
1046
1047 ia = link->network->dns[i].address.in;
1048
1049 /* Never propagate obviously borked data */
1050 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1051 continue;
1052
1053 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1054 return log_oom();
1055
1056 addresses[n_addresses++] = ia;
1057 }
1058
1059 if (link->network->dhcp_use_dns && link->dhcp_lease) {
1060 const struct in_addr *da = NULL;
1061 int j, n;
1062
1063 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
1064 if (n > 0) {
1065
1066 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1067 return log_oom();
1068
1069 for (j = 0; j < n; j++)
1070 if (in4_addr_is_non_local(&da[j]))
1071 addresses[n_addresses++] = da[j];
1072 }
1073 }
1074
1075 if (n_addresses <= 0)
1076 return 0;
1077
1078 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
1079 }
1080
1081 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1082 _cleanup_free_ struct in_addr *addresses = NULL;
1083 size_t n_addresses = 0, n_allocated = 0;
1084 char **a;
1085
1086 if (!link->network)
1087 return 0;
1088
1089 log_debug("Copying NTP server information from %s", link->ifname);
1090
1091 STRV_FOREACH(a, link->network->ntp) {
1092 struct in_addr ia;
1093
1094 /* Only look for IPv4 addresses */
1095 if (inet_pton(AF_INET, *a, &ia) <= 0)
1096 continue;
1097
1098 /* Never propagate obviously borked data */
1099 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1100 continue;
1101
1102 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1103 return log_oom();
1104
1105 addresses[n_addresses++] = ia;
1106 }
1107
1108 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1109 const struct in_addr *da = NULL;
1110 int j, n;
1111
1112 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1113 if (n > 0) {
1114
1115 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1116 return log_oom();
1117
1118 for (j = 0; j < n; j++)
1119 if (in4_addr_is_non_local(&da[j]))
1120 addresses[n_addresses++] = da[j];
1121 }
1122 }
1123
1124 if (n_addresses <= 0)
1125 return 0;
1126
1127 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1128 }
1129
1130 static int link_set_bridge_fdb(Link *link) {
1131 FdbEntry *fdb_entry;
1132 int r;
1133
1134 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1135 r = fdb_entry_configure(link, fdb_entry);
1136 if (r < 0)
1137 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1138 }
1139
1140 return 0;
1141 }
1142
1143 static int link_request_set_addresses(Link *link) {
1144 AddressLabel *label;
1145 Address *ad;
1146 int r;
1147
1148 assert(link);
1149 assert(link->network);
1150 assert(link->state != _LINK_STATE_INVALID);
1151
1152 link_set_state(link, LINK_STATE_CONFIGURING);
1153
1154 /* Reset all *_configured flags we are configuring. */
1155 link->addresses_configured = false;
1156 link->addresses_ready = false;
1157 link->neighbors_configured = false;
1158 link->static_routes_configured = false;
1159 link->routing_policy_rules_configured = false;
1160
1161 r = link_set_bridge_fdb(link);
1162 if (r < 0)
1163 return r;
1164
1165 r = link_request_set_neighbors(link);
1166 if (r < 0)
1167 return r;
1168
1169 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1170 bool update;
1171
1172 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1173
1174 r = address_configure(ad, link, address_handler, update);
1175 if (r < 0) {
1176 log_link_warning_errno(link, r, "Could not set addresses: %m");
1177 link_enter_failed(link);
1178 return r;
1179 }
1180
1181 link->address_messages++;
1182 }
1183
1184 LIST_FOREACH(labels, label, link->network->address_labels) {
1185 r = address_label_configure(label, link, NULL, false);
1186 if (r < 0) {
1187 log_link_warning_errno(link, r, "Could not set address label: %m");
1188 link_enter_failed(link);
1189 return r;
1190 }
1191
1192 link->address_label_messages++;
1193 }
1194
1195 /* now that we can figure out a default address for the dhcp server,
1196 start it */
1197 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1198 Address *address;
1199 Link *uplink = NULL;
1200 bool acquired_uplink = false;
1201
1202 address = link_find_dhcp_server_address(link);
1203 if (!address) {
1204 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1205 link_enter_failed(link);
1206 return 0;
1207 }
1208
1209 /* use the server address' subnet as the pool */
1210 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1211 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1212 if (r < 0)
1213 return r;
1214
1215 /* TODO:
1216 r = sd_dhcp_server_set_router(link->dhcp_server,
1217 &main_address->in_addr.in);
1218 if (r < 0)
1219 return r;
1220 */
1221
1222 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1223 r = sd_dhcp_server_set_max_lease_time(
1224 link->dhcp_server,
1225 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1226 if (r < 0)
1227 return r;
1228 }
1229
1230 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1231 r = sd_dhcp_server_set_default_lease_time(
1232 link->dhcp_server,
1233 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1234 if (r < 0)
1235 return r;
1236 }
1237
1238 if (link->network->dhcp_server_emit_dns) {
1239
1240 if (link->network->n_dhcp_server_dns > 0)
1241 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1242 else {
1243 uplink = manager_find_uplink(link->manager, link);
1244 acquired_uplink = true;
1245
1246 if (!uplink) {
1247 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1248 r = 0;
1249 } else
1250 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1251 }
1252 if (r < 0)
1253 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1254 }
1255
1256 if (link->network->dhcp_server_emit_ntp) {
1257
1258 if (link->network->n_dhcp_server_ntp > 0)
1259 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1260 else {
1261 if (!acquired_uplink)
1262 uplink = manager_find_uplink(link->manager, link);
1263
1264 if (!uplink) {
1265 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1266 r = 0;
1267 } else
1268 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1269
1270 }
1271 if (r < 0)
1272 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1273 }
1274
1275 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1276 if (r < 0)
1277 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1278
1279 if (link->network->dhcp_server_emit_timezone) {
1280 _cleanup_free_ char *buffer = NULL;
1281 const char *tz = NULL;
1282
1283 if (link->network->dhcp_server_timezone)
1284 tz = link->network->dhcp_server_timezone;
1285 else {
1286 r = get_timezone(&buffer);
1287 if (r < 0)
1288 log_warning_errno(r, "Failed to determine timezone: %m");
1289 else
1290 tz = buffer;
1291 }
1292
1293 if (tz) {
1294 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1295 if (r < 0)
1296 return r;
1297 }
1298 }
1299 if (!sd_dhcp_server_is_running(link->dhcp_server)) {
1300 r = sd_dhcp_server_start(link->dhcp_server);
1301 if (r < 0) {
1302 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1303
1304 link_enter_failed(link);
1305
1306 return 0;
1307 }
1308 }
1309
1310 log_link_debug(link, "Offering DHCPv4 leases");
1311 }
1312
1313 if (link->address_messages == 0) {
1314 link->addresses_configured = true;
1315 link_check_ready(link);
1316 } else
1317 log_link_debug(link, "Setting addresses");
1318
1319 return 0;
1320 }
1321
1322 static int link_set_bridge_vlan(Link *link) {
1323 int r = 0;
1324
1325 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1326 if (r < 0)
1327 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1328
1329 return r;
1330 }
1331
1332 static int link_set_proxy_arp(Link *link) {
1333 const char *p = NULL;
1334 int r;
1335
1336 if (!link_proxy_arp_enabled(link))
1337 return 0;
1338
1339 p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/proxy_arp");
1340
1341 r = write_string_file(p, one_zero(link->network->proxy_arp), WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
1342 if (r < 0)
1343 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1344
1345 return 0;
1346 }
1347
1348 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1349 int r;
1350
1351 assert(link);
1352
1353 log_link_debug(link, "Set link");
1354
1355 r = sd_netlink_message_get_errno(m);
1356 if (r < 0 && r != -EEXIST) {
1357 log_link_error_errno(link, r, "Could not join netdev: %m");
1358 link_enter_failed(link);
1359 }
1360
1361 return 1;
1362 }
1363
1364 static int link_configure_after_setting_mtu(Link *link);
1365
1366 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1367 int r;
1368
1369 assert(m);
1370 assert(link);
1371 assert(link->ifname);
1372
1373 link->setting_mtu = false;
1374
1375 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1376 return 1;
1377
1378 r = sd_netlink_message_get_errno(m);
1379 if (r < 0) {
1380 log_link_warning_errno(link, r, "Could not set MTU: %m");
1381 return 1;
1382 }
1383
1384 log_link_debug(link, "Setting MTU done.");
1385
1386 if (link->state == LINK_STATE_PENDING)
1387 (void) link_configure_after_setting_mtu(link);
1388
1389 return 1;
1390 }
1391
1392 int link_set_mtu(Link *link, uint32_t mtu) {
1393 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1394 int r;
1395
1396 assert(link);
1397 assert(link->manager);
1398 assert(link->manager->rtnl);
1399
1400 if (link->mtu == mtu || link->setting_mtu)
1401 return 0;
1402
1403 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1404
1405 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1406 if (r < 0)
1407 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1408
1409 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1410 * for this interface, or if it is a bridge slave, then disable IPv6 else enable it. */
1411 (void) link_enable_ipv6(link);
1412
1413 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1414 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1415 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1416
1417 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1418 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1419
1420 mtu = IPV6_MIN_MTU;
1421 }
1422
1423 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1424 if (r < 0)
1425 return log_link_error_errno(link, r, "Could not append MTU: %m");
1426
1427 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1428 link_netlink_destroy_callback, link);
1429 if (r < 0)
1430 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1431
1432 link_ref(link);
1433 link->setting_mtu = true;
1434
1435 return 0;
1436 }
1437
1438 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1439 int r;
1440
1441 assert(m);
1442 assert(link);
1443 assert(link->ifname);
1444
1445 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1446 return 1;
1447
1448 r = sd_netlink_message_get_errno(m);
1449 if (r < 0)
1450 log_link_warning_errno(link, r, "Could not set link flags: %m");
1451
1452 return 1;
1453 }
1454
1455 static int link_set_flags(Link *link) {
1456 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1457 unsigned ifi_change = 0;
1458 unsigned ifi_flags = 0;
1459 int r;
1460
1461 assert(link);
1462 assert(link->manager);
1463 assert(link->manager->rtnl);
1464
1465 if (link->flags & IFF_LOOPBACK)
1466 return 0;
1467
1468 if (!link->network)
1469 return 0;
1470
1471 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1472 return 0;
1473
1474 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1475 if (r < 0)
1476 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1477
1478 if (link->network->arp >= 0) {
1479 ifi_change |= IFF_NOARP;
1480 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1481 }
1482
1483 if (link->network->multicast >= 0) {
1484 ifi_change |= IFF_MULTICAST;
1485 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1486 }
1487
1488 if (link->network->allmulticast >= 0) {
1489 ifi_change |= IFF_ALLMULTI;
1490 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1491 }
1492
1493 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1494 if (r < 0)
1495 return log_link_error_errno(link, r, "Could not set link flags: %m");
1496
1497 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1498 link_netlink_destroy_callback, link);
1499 if (r < 0)
1500 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1501
1502 link_ref(link);
1503
1504 return 0;
1505 }
1506
1507 static int link_set_bridge(Link *link) {
1508 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1509 int r;
1510
1511 assert(link);
1512 assert(link->network);
1513
1514 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1515 if (r < 0)
1516 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1517
1518 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1519 if (r < 0)
1520 return log_link_error_errno(link, r, "Could not set message family: %m");
1521
1522 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1523 if (r < 0)
1524 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1525
1526 if (link->network->use_bpdu >= 0) {
1527 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
1528 if (r < 0)
1529 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1530 }
1531
1532 if (link->network->hairpin >= 0) {
1533 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1534 if (r < 0)
1535 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1536 }
1537
1538 if (link->network->fast_leave >= 0) {
1539 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1540 if (r < 0)
1541 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1542 }
1543
1544 if (link->network->allow_port_to_be_root >= 0) {
1545 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
1546 if (r < 0)
1547 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1548
1549 }
1550
1551 if (link->network->unicast_flood >= 0) {
1552 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1553 if (r < 0)
1554 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1555 }
1556
1557 if (link->network->multicast_to_unicast >= 0) {
1558 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_TO_UCAST, link->network->multicast_to_unicast);
1559 if (r < 0)
1560 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_TO_UCAST attribute: %m");
1561 }
1562
1563 if (link->network->cost != 0) {
1564 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1565 if (r < 0)
1566 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1567 }
1568
1569 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1570 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1571 if (r < 0)
1572 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1573 }
1574
1575 r = sd_netlink_message_close_container(req);
1576 if (r < 0)
1577 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1578
1579 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_handler,
1580 link_netlink_destroy_callback, link);
1581 if (r < 0)
1582 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1583
1584 link_ref(link);
1585
1586 return r;
1587 }
1588
1589 static int link_set_bond_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1590 int r;
1591
1592 assert(m);
1593 assert(link);
1594 assert(link->ifname);
1595
1596 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1597 return 1;
1598
1599 r = sd_netlink_message_get_errno(m);
1600 if (r < 0) {
1601 log_link_warning_errno(link, r, "Could not set bonding interface: %m");
1602 return 1;
1603 }
1604
1605 return 1;
1606 }
1607
1608 static int link_set_bond(Link *link) {
1609 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1610 int r;
1611
1612 assert(link);
1613 assert(link->network);
1614
1615 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1616 if (r < 0)
1617 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1618
1619 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1620 if (r < 0)
1621 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1622
1623 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1624 if (r < 0)
1625 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1626
1627 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1628 if (r < 0)
1629 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1630
1631 if (link->network->active_slave) {
1632 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1633 if (r < 0)
1634 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1635 }
1636
1637 if (link->network->primary_slave) {
1638 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1639 if (r < 0)
1640 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1641 }
1642
1643 r = sd_netlink_message_close_container(req);
1644 if (r < 0)
1645 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1646
1647 r = sd_netlink_message_close_container(req);
1648 if (r < 0)
1649 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1650
1651 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_bond_handler,
1652 link_netlink_destroy_callback, link);
1653 if (r < 0)
1654 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1655
1656 link_ref(link);
1657
1658 return r;
1659 }
1660
1661 static int link_append_bond_slave(Link *link) {
1662 Link *master;
1663 int r;
1664
1665 assert(link);
1666 assert(link->network);
1667 assert(link->network->bond);
1668
1669 r = link_get(link->manager, link->network->bond->ifindex, &master);
1670 if (r < 0)
1671 return r;
1672
1673 r = hashmap_ensure_allocated(&master->bond_slaves, NULL);
1674 if (r < 0)
1675 return r;
1676
1677 r = hashmap_put(master->bond_slaves, INT_TO_PTR(link->ifindex), link);
1678 if (r < 0)
1679 return r;
1680
1681 return 0;
1682 }
1683
1684 static int link_lldp_save(Link *link) {
1685 _cleanup_free_ char *temp_path = NULL;
1686 _cleanup_fclose_ FILE *f = NULL;
1687 sd_lldp_neighbor **l = NULL;
1688 int n = 0, r, i;
1689
1690 assert(link);
1691 assert(link->lldp_file);
1692
1693 if (!link->lldp) {
1694 (void) unlink(link->lldp_file);
1695 return 0;
1696 }
1697
1698 r = sd_lldp_get_neighbors(link->lldp, &l);
1699 if (r < 0)
1700 goto finish;
1701 if (r == 0) {
1702 (void) unlink(link->lldp_file);
1703 goto finish;
1704 }
1705
1706 n = r;
1707
1708 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1709 if (r < 0)
1710 goto finish;
1711
1712 fchmod(fileno(f), 0644);
1713
1714 for (i = 0; i < n; i++) {
1715 const void *p;
1716 le64_t u;
1717 size_t sz;
1718
1719 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1720 if (r < 0)
1721 goto finish;
1722
1723 u = htole64(sz);
1724 (void) fwrite(&u, 1, sizeof(u), f);
1725 (void) fwrite(p, 1, sz, f);
1726 }
1727
1728 r = fflush_and_check(f);
1729 if (r < 0)
1730 goto finish;
1731
1732 if (rename(temp_path, link->lldp_file) < 0) {
1733 r = -errno;
1734 goto finish;
1735 }
1736
1737 finish:
1738 if (r < 0) {
1739 (void) unlink(link->lldp_file);
1740 if (temp_path)
1741 (void) unlink(temp_path);
1742
1743 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1744 }
1745
1746 if (l) {
1747 for (i = 0; i < n; i++)
1748 sd_lldp_neighbor_unref(l[i]);
1749 free(l);
1750 }
1751
1752 return r;
1753 }
1754
1755 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1756 Link *link = userdata;
1757 int r;
1758
1759 assert(link);
1760
1761 (void) link_lldp_save(link);
1762
1763 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1764 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1765
1766 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1767
1768 r = link_lldp_emit_start(link);
1769 if (r < 0)
1770 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1771 }
1772 }
1773
1774 static int link_acquire_ipv6_conf(Link *link) {
1775 int r;
1776
1777 assert(link);
1778
1779 if (link_ipv6_accept_ra_enabled(link)) {
1780 assert(link->ndisc);
1781
1782 log_link_debug(link, "Discovering IPv6 routers");
1783
1784 r = sd_ndisc_start(link->ndisc);
1785 if (r < 0 && r != -EBUSY)
1786 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1787 }
1788
1789 if (link_radv_enabled(link)) {
1790 assert(link->radv);
1791 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1792
1793 log_link_debug(link, "Starting IPv6 Router Advertisements");
1794
1795 r = sd_radv_start(link->radv);
1796 if (r < 0 && r != -EBUSY)
1797 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1798 }
1799
1800 (void) dhcp6_request_prefix_delegation(link);
1801
1802 return 0;
1803 }
1804
1805 static int link_acquire_ipv4_conf(Link *link) {
1806 int r;
1807
1808 assert(link);
1809 assert(link->network);
1810 assert(link->manager);
1811 assert(link->manager->event);
1812
1813 if (link_ipv4ll_enabled(link)) {
1814 assert(link->ipv4ll);
1815
1816 log_link_debug(link, "Acquiring IPv4 link-local address");
1817
1818 r = sd_ipv4ll_start(link->ipv4ll);
1819 if (r < 0)
1820 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1821 }
1822
1823 if (link_dhcp4_enabled(link)) {
1824 assert(link->dhcp_client);
1825
1826 log_link_debug(link, "Acquiring DHCPv4 lease");
1827
1828 r = sd_dhcp_client_start(link->dhcp_client);
1829 if (r < 0)
1830 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1831 }
1832
1833 return 0;
1834 }
1835
1836 static int link_acquire_conf(Link *link) {
1837 int r;
1838
1839 assert(link);
1840
1841 r = link_acquire_ipv4_conf(link);
1842 if (r < 0)
1843 return r;
1844
1845 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1846 r = link_acquire_ipv6_conf(link);
1847 if (r < 0)
1848 return r;
1849 }
1850
1851 if (link_lldp_emit_enabled(link)) {
1852 r = link_lldp_emit_start(link);
1853 if (r < 0)
1854 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1855 }
1856
1857 return 0;
1858 }
1859
1860 bool link_has_carrier(Link *link) {
1861 /* see Documentation/networking/operstates.txt in the kernel sources */
1862
1863 if (link->kernel_operstate == IF_OPER_UP)
1864 return true;
1865
1866 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1867 /* operstate may not be implemented, so fall back to flags */
1868 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1869 return true;
1870
1871 return false;
1872 }
1873
1874 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1875 int r;
1876
1877 assert(link);
1878
1879 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1880 return 1;
1881
1882 r = sd_netlink_message_get_errno(m);
1883 if (r < 0)
1884 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1885
1886 return 1;
1887 }
1888
1889 static int link_configure_addrgen_mode(Link *link) {
1890 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1891 uint8_t ipv6ll_mode;
1892 int r;
1893
1894 assert(link);
1895 assert(link->network);
1896 assert(link->manager);
1897 assert(link->manager->rtnl);
1898
1899 log_link_debug(link, "Setting address genmode for link");
1900
1901 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1902 if (r < 0)
1903 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1904
1905 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1906 if (r < 0)
1907 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1908
1909 r = sd_netlink_message_open_container(req, AF_INET6);
1910 if (r < 0)
1911 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1912
1913 if (!link_ipv6ll_enabled(link))
1914 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1915 else {
1916 const char *p = NULL;
1917 _cleanup_free_ char *stable_secret = NULL;
1918
1919 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/stable_secret");
1920
1921 /* The file may not exist. And event if it exists, when stable_secret is unset,
1922 * then reading the file fails and EIO is returned. */
1923 r = read_one_line_file(p, &stable_secret);
1924 if (r < 0)
1925 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1926 else
1927 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1928 }
1929
1930 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1931 if (r < 0)
1932 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1933
1934 r = sd_netlink_message_close_container(req);
1935 if (r < 0)
1936 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1937
1938 r = sd_netlink_message_close_container(req);
1939 if (r < 0)
1940 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1941
1942 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1943 link_netlink_destroy_callback, link);
1944 if (r < 0)
1945 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1946
1947 link_ref(link);
1948
1949 return 0;
1950 }
1951
1952 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1953 int r;
1954
1955 assert(link);
1956
1957 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1958 return 1;
1959
1960 r = sd_netlink_message_get_errno(m);
1961 if (r < 0)
1962 /* we warn but don't fail the link, as it may be brought up later */
1963 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1964
1965 return 1;
1966 }
1967
1968 static int link_up(Link *link) {
1969 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1970 int r;
1971
1972 assert(link);
1973 assert(link->network);
1974 assert(link->manager);
1975 assert(link->manager->rtnl);
1976
1977 log_link_debug(link, "Bringing link up");
1978
1979 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1980 if (r < 0)
1981 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1982
1983 /* set it free if not enslaved with networkd */
1984 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1985 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1986 if (r < 0)
1987 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1988 }
1989
1990 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1991 if (r < 0)
1992 return log_link_error_errno(link, r, "Could not set link flags: %m");
1993
1994 if (link->network->mac) {
1995 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1996 if (r < 0)
1997 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1998 }
1999
2000 if (link_ipv6_enabled(link)) {
2001 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
2002 if (r < 0)
2003 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
2004
2005 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
2006 r = sd_netlink_message_open_container(req, AF_INET6);
2007 if (r < 0)
2008 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
2009
2010 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
2011 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
2012 if (r < 0)
2013 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
2014 }
2015
2016 r = sd_netlink_message_close_container(req);
2017 if (r < 0)
2018 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
2019
2020 r = sd_netlink_message_close_container(req);
2021 if (r < 0)
2022 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
2023 }
2024
2025 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2026 link_netlink_destroy_callback, link);
2027 if (r < 0)
2028 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2029
2030 link_ref(link);
2031
2032 return 0;
2033 }
2034
2035 static int link_up_can(Link *link) {
2036 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2037 int r;
2038
2039 assert(link);
2040
2041 log_link_debug(link, "Bringing CAN link up");
2042
2043 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2044 if (r < 0)
2045 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2046
2047 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
2048 if (r < 0)
2049 return log_link_error_errno(link, r, "Could not set link flags: %m");
2050
2051 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2052 link_netlink_destroy_callback, link);
2053 if (r < 0)
2054 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2055
2056 link_ref(link);
2057
2058 return 0;
2059 }
2060
2061 static int link_set_can(Link *link) {
2062 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
2063 int r;
2064
2065 assert(link);
2066 assert(link->network);
2067 assert(link->manager);
2068 assert(link->manager->rtnl);
2069
2070 log_link_debug(link, "link_set_can");
2071
2072 r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
2073 if (r < 0)
2074 return log_link_error_errno(link, r, "Failed to allocate netlink message: %m");
2075
2076 r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
2077 if (r < 0)
2078 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
2079
2080 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
2081 if (r < 0)
2082 return log_link_error_errno(link, r, "Failed to open netlink container: %m");
2083
2084 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
2085 if (r < 0)
2086 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
2087
2088 if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) {
2089 struct can_bittiming bt = {
2090 .bitrate = link->network->can_bitrate,
2091 .sample_point = link->network->can_sample_point,
2092 };
2093
2094 if (link->network->can_bitrate > UINT32_MAX) {
2095 log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate);
2096 return -ERANGE;
2097 }
2098
2099 log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate);
2100 if (link->network->can_sample_point > 0)
2101 log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
2102 else
2103 log_link_debug(link, "Using default sample point");
2104
2105 r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
2106 if (r < 0)
2107 return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
2108 }
2109
2110 if (link->network->can_restart_us > 0) {
2111 char time_string[FORMAT_TIMESPAN_MAX];
2112 uint64_t restart_ms;
2113
2114 if (link->network->can_restart_us == USEC_INFINITY)
2115 restart_ms = 0;
2116 else
2117 restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC);
2118
2119 format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC);
2120
2121 if (restart_ms > UINT32_MAX) {
2122 log_link_error(link, "restart timeout (%s) too big.", time_string);
2123 return -ERANGE;
2124 }
2125
2126 log_link_debug(link, "Setting restart = %s", time_string);
2127
2128 r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
2129 if (r < 0)
2130 return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
2131 }
2132
2133 r = sd_netlink_message_close_container(m);
2134 if (r < 0)
2135 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2136
2137 r = sd_netlink_message_close_container(m);
2138 if (r < 0)
2139 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2140
2141 r = netlink_call_async(link->manager->rtnl, NULL, m, link_set_handler,
2142 link_netlink_destroy_callback, link);
2143 if (r < 0)
2144 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2145
2146 link_ref(link);
2147
2148 if (!(link->flags & IFF_UP)) {
2149 r = link_up_can(link);
2150 if (r < 0) {
2151 link_enter_failed(link);
2152 return r;
2153 }
2154 }
2155
2156 log_link_debug(link, "link_set_can done");
2157
2158 return r;
2159 }
2160
2161 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2162 int r;
2163
2164 assert(link);
2165
2166 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2167 return 1;
2168
2169 r = sd_netlink_message_get_errno(m);
2170 if (r < 0)
2171 log_link_warning_errno(link, r, "Could not bring down interface: %m");
2172
2173 if (streq_ptr(link->kind, "can"))
2174 link_set_can(link);
2175
2176 return 1;
2177 }
2178
2179 int link_down(Link *link) {
2180 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2181 int r;
2182
2183 assert(link);
2184 assert(link->manager);
2185 assert(link->manager->rtnl);
2186
2187 log_link_debug(link, "Bringing link down");
2188
2189 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
2190 RTM_SETLINK, link->ifindex);
2191 if (r < 0)
2192 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2193
2194 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
2195 if (r < 0)
2196 return log_link_error_errno(link, r, "Could not set link flags: %m");
2197
2198 r = netlink_call_async(link->manager->rtnl, NULL, req, link_down_handler,
2199 link_netlink_destroy_callback, link);
2200 if (r < 0)
2201 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2202
2203 link_ref(link);
2204
2205 return 0;
2206 }
2207
2208 static int link_handle_bound_to_list(Link *link) {
2209 Link *l;
2210 Iterator i;
2211 int r;
2212 bool required_up = false;
2213 bool link_is_up = false;
2214
2215 assert(link);
2216
2217 if (hashmap_isempty(link->bound_to_links))
2218 return 0;
2219
2220 if (link->flags & IFF_UP)
2221 link_is_up = true;
2222
2223 HASHMAP_FOREACH (l, link->bound_to_links, i)
2224 if (link_has_carrier(l)) {
2225 required_up = true;
2226 break;
2227 }
2228
2229 if (!required_up && link_is_up) {
2230 r = link_down(link);
2231 if (r < 0)
2232 return r;
2233 } else if (required_up && !link_is_up) {
2234 r = link_up(link);
2235 if (r < 0)
2236 return r;
2237 }
2238
2239 return 0;
2240 }
2241
2242 static int link_handle_bound_by_list(Link *link) {
2243 Iterator i;
2244 Link *l;
2245 int r;
2246
2247 assert(link);
2248
2249 if (hashmap_isempty(link->bound_by_links))
2250 return 0;
2251
2252 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2253 r = link_handle_bound_to_list(l);
2254 if (r < 0)
2255 return r;
2256 }
2257
2258 return 0;
2259 }
2260
2261 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2262 int r;
2263
2264 assert(link);
2265 assert(carrier);
2266
2267 if (link == carrier)
2268 return 0;
2269
2270 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2271 return 0;
2272
2273 r = hashmap_ensure_allocated(h, NULL);
2274 if (r < 0)
2275 return r;
2276
2277 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2278 if (r < 0)
2279 return r;
2280
2281 return 0;
2282 }
2283
2284 static int link_new_bound_by_list(Link *link) {
2285 Manager *m;
2286 Link *carrier;
2287 Iterator i;
2288 int r;
2289 bool list_updated = false;
2290
2291 assert(link);
2292 assert(link->manager);
2293
2294 m = link->manager;
2295
2296 HASHMAP_FOREACH(carrier, m->links, i) {
2297 if (!carrier->network)
2298 continue;
2299
2300 if (strv_isempty(carrier->network->bind_carrier))
2301 continue;
2302
2303 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2304 r = link_put_carrier(link, carrier, &link->bound_by_links);
2305 if (r < 0)
2306 return r;
2307
2308 list_updated = true;
2309 }
2310 }
2311
2312 if (list_updated)
2313 link_dirty(link);
2314
2315 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2316 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2317 if (r < 0)
2318 return r;
2319
2320 link_dirty(carrier);
2321 }
2322
2323 return 0;
2324 }
2325
2326 static int link_new_bound_to_list(Link *link) {
2327 Manager *m;
2328 Link *carrier;
2329 Iterator i;
2330 int r;
2331 bool list_updated = false;
2332
2333 assert(link);
2334 assert(link->manager);
2335
2336 if (!link->network)
2337 return 0;
2338
2339 if (strv_isempty(link->network->bind_carrier))
2340 return 0;
2341
2342 m = link->manager;
2343
2344 HASHMAP_FOREACH (carrier, m->links, i) {
2345 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2346 r = link_put_carrier(link, carrier, &link->bound_to_links);
2347 if (r < 0)
2348 return r;
2349
2350 list_updated = true;
2351 }
2352 }
2353
2354 if (list_updated)
2355 link_dirty(link);
2356
2357 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2358 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2359 if (r < 0)
2360 return r;
2361
2362 link_dirty(carrier);
2363 }
2364
2365 return 0;
2366 }
2367
2368 static int link_new_carrier_maps(Link *link) {
2369 int r;
2370
2371 r = link_new_bound_by_list(link);
2372 if (r < 0)
2373 return r;
2374
2375 r = link_handle_bound_by_list(link);
2376 if (r < 0)
2377 return r;
2378
2379 r = link_new_bound_to_list(link);
2380 if (r < 0)
2381 return r;
2382
2383 r = link_handle_bound_to_list(link);
2384 if (r < 0)
2385 return r;
2386
2387 return 0;
2388 }
2389
2390 static void link_free_bound_to_list(Link *link) {
2391 Link *bound_to;
2392 Iterator i;
2393
2394 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2395 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2396
2397 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2398 link_dirty(bound_to);
2399 }
2400
2401 return;
2402 }
2403
2404 static void link_free_bound_by_list(Link *link) {
2405 Link *bound_by;
2406 Iterator i;
2407
2408 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2409 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2410
2411 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2412 link_dirty(bound_by);
2413 link_handle_bound_to_list(bound_by);
2414 }
2415 }
2416
2417 return;
2418 }
2419
2420 static void link_free_carrier_maps(Link *link) {
2421 bool list_updated = false;
2422
2423 assert(link);
2424
2425 if (!hashmap_isempty(link->bound_to_links)) {
2426 link_free_bound_to_list(link);
2427 list_updated = true;
2428 }
2429
2430 if (!hashmap_isempty(link->bound_by_links)) {
2431 link_free_bound_by_list(link);
2432 list_updated = true;
2433 }
2434
2435 if (list_updated)
2436 link_dirty(link);
2437
2438 return;
2439 }
2440
2441 void link_drop(Link *link) {
2442 if (!link || link->state == LINK_STATE_LINGER)
2443 return;
2444
2445 link_set_state(link, LINK_STATE_LINGER);
2446
2447 link_free_carrier_maps(link);
2448
2449 log_link_debug(link, "Link removed");
2450
2451 (void) unlink(link->state_file);
2452
2453 link_detach_from_manager(link);
2454
2455 link_unref(link);
2456
2457 return;
2458 }
2459
2460 static int link_joined(Link *link) {
2461 int r;
2462
2463 assert(link);
2464 assert(link->network);
2465
2466 if (!hashmap_isempty(link->bound_to_links)) {
2467 r = link_handle_bound_to_list(link);
2468 if (r < 0)
2469 return r;
2470 } else if (!(link->flags & IFF_UP)) {
2471 r = link_up(link);
2472 if (r < 0) {
2473 link_enter_failed(link);
2474 return r;
2475 }
2476 }
2477
2478 if (link->network->bridge) {
2479 r = link_set_bridge(link);
2480 if (r < 0)
2481 log_link_error_errno(link, r, "Could not set bridge message: %m");
2482 }
2483
2484 if (link->network->bond) {
2485 r = link_set_bond(link);
2486 if (r < 0)
2487 log_link_error_errno(link, r, "Could not set bond message: %m");
2488
2489 r = link_append_bond_slave(link);
2490 if (r < 0)
2491 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2492 }
2493
2494 if (link->network->use_br_vlan &&
2495 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2496 r = link_set_bridge_vlan(link);
2497 if (r < 0)
2498 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2499 }
2500
2501 /* Skip setting up addresses until it gets carrier,
2502 or it would try to set addresses twice,
2503 which is bad for non-idempotent steps. */
2504 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2505 return 0;
2506
2507 return link_request_set_addresses(link);
2508 }
2509
2510 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2511 int r;
2512
2513 assert(link);
2514 assert(link->network);
2515
2516 link->enslaving--;
2517
2518 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2519 return 1;
2520
2521 r = sd_netlink_message_get_errno(m);
2522 if (r < 0 && r != -EEXIST) {
2523 log_link_error_errno(link, r, "Could not join netdev: %m");
2524 link_enter_failed(link);
2525 return 1;
2526 } else
2527 log_link_debug(link, "Joined netdev");
2528
2529 if (link->enslaving <= 0)
2530 link_joined(link);
2531
2532 return 1;
2533 }
2534
2535 static int link_enter_join_netdev(Link *link) {
2536 NetDev *netdev;
2537 Iterator i;
2538 int r;
2539
2540 assert(link);
2541 assert(link->network);
2542 assert(link->state == LINK_STATE_PENDING);
2543
2544 link_set_state(link, LINK_STATE_CONFIGURING);
2545
2546 link_dirty(link);
2547
2548 if (!link->network->bridge &&
2549 !link->network->bond &&
2550 !link->network->vrf &&
2551 hashmap_isempty(link->network->stacked_netdevs))
2552 return link_joined(link);
2553
2554 if (link->network->bond) {
2555 if (link->network->bond->state == NETDEV_STATE_READY &&
2556 link->network->bond->ifindex == link->master_ifindex)
2557 return link_joined(link);
2558
2559 log_struct(LOG_DEBUG,
2560 LOG_LINK_INTERFACE(link),
2561 LOG_NETDEV_INTERFACE(link->network->bond),
2562 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2563
2564 r = netdev_join(link->network->bond, link, netdev_join_handler);
2565 if (r < 0) {
2566 log_struct_errno(LOG_WARNING, r,
2567 LOG_LINK_INTERFACE(link),
2568 LOG_NETDEV_INTERFACE(link->network->bond),
2569 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2570 link_enter_failed(link);
2571 return r;
2572 }
2573
2574 link->enslaving++;
2575 }
2576
2577 if (link->network->bridge) {
2578 log_struct(LOG_DEBUG,
2579 LOG_LINK_INTERFACE(link),
2580 LOG_NETDEV_INTERFACE(link->network->bridge),
2581 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2582
2583 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2584 if (r < 0) {
2585 log_struct_errno(LOG_WARNING, r,
2586 LOG_LINK_INTERFACE(link),
2587 LOG_NETDEV_INTERFACE(link->network->bridge),
2588 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2589 link_enter_failed(link);
2590 return r;
2591 }
2592
2593 link->enslaving++;
2594 }
2595
2596 if (link->network->vrf) {
2597 log_struct(LOG_DEBUG,
2598 LOG_LINK_INTERFACE(link),
2599 LOG_NETDEV_INTERFACE(link->network->vrf),
2600 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2601
2602 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2603 if (r < 0) {
2604 log_struct_errno(LOG_WARNING, r,
2605 LOG_LINK_INTERFACE(link),
2606 LOG_NETDEV_INTERFACE(link->network->vrf),
2607 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2608 link_enter_failed(link);
2609 return r;
2610 }
2611
2612 link->enslaving++;
2613 }
2614
2615 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2616
2617 if (netdev->ifindex > 0) {
2618 link_joined(link);
2619 continue;
2620 }
2621
2622 log_struct(LOG_DEBUG,
2623 LOG_LINK_INTERFACE(link),
2624 LOG_NETDEV_INTERFACE(netdev),
2625 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2626
2627 r = netdev_join(netdev, link, netdev_join_handler);
2628 if (r < 0) {
2629 log_struct_errno(LOG_WARNING, r,
2630 LOG_LINK_INTERFACE(link),
2631 LOG_NETDEV_INTERFACE(netdev),
2632 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2633 link_enter_failed(link);
2634 return r;
2635 }
2636
2637 link->enslaving++;
2638 }
2639
2640 return 0;
2641 }
2642
2643 static int link_set_ipv4_forward(Link *link) {
2644 int r;
2645
2646 if (!link_ipv4_forward_enabled(link))
2647 return 0;
2648
2649 /* We propagate the forwarding flag from one interface to the
2650 * global setting one way. This means: as long as at least one
2651 * interface was configured at any time that had IP forwarding
2652 * enabled the setting will stay on for good. We do this
2653 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2654 * somewhat in sync (see below). */
2655
2656 r = write_string_file("/proc/sys/net/ipv4/ip_forward", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2657 if (r < 0)
2658 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2659
2660 return 0;
2661 }
2662
2663 static int link_set_ipv6_forward(Link *link) {
2664 int r;
2665
2666 if (!link_ipv6_forward_enabled(link))
2667 return 0;
2668
2669 /* On Linux, the IPv6 stack does not know a per-interface
2670 * packet forwarding setting: either packet forwarding is on
2671 * for all, or off for all. We hence don't bother with a
2672 * per-interface setting, but simply propagate the interface
2673 * flag, if it is set, to the global flag, one-way. Note that
2674 * while IPv4 would allow a per-interface flag, we expose the
2675 * same behaviour there and also propagate the setting from
2676 * one to all, to keep things simple (see above). */
2677
2678 r = write_string_file("/proc/sys/net/ipv6/conf/all/forwarding", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2679 if (r < 0)
2680 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2681
2682 return 0;
2683 }
2684
2685 static int link_set_ipv6_privacy_extensions(Link *link) {
2686 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2687 IPv6PrivacyExtensions s;
2688 const char *p = NULL;
2689 int r;
2690
2691 s = link_ipv6_privacy_extensions(link);
2692 if (s < 0)
2693 return 0;
2694
2695 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/use_tempaddr");
2696 xsprintf(buf, "%u", (unsigned) link->network->ipv6_privacy_extensions);
2697
2698 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2699 if (r < 0)
2700 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2701
2702 return 0;
2703 }
2704
2705 static int link_set_ipv6_accept_ra(Link *link) {
2706 const char *p = NULL;
2707 int r;
2708
2709 /* Make this a NOP if IPv6 is not available */
2710 if (!socket_ipv6_is_supported())
2711 return 0;
2712
2713 if (link->flags & IFF_LOOPBACK)
2714 return 0;
2715
2716 if (!link->network)
2717 return 0;
2718
2719 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/accept_ra");
2720
2721 /* We handle router advertisements ourselves, tell the kernel to GTFO */
2722 r = write_string_file(p, "0", WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2723 if (r < 0)
2724 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2725
2726 return 0;
2727 }
2728
2729 static int link_set_ipv6_dad_transmits(Link *link) {
2730 char buf[DECIMAL_STR_MAX(int) + 1];
2731 const char *p = NULL;
2732 int r;
2733
2734 /* Make this a NOP if IPv6 is not available */
2735 if (!socket_ipv6_is_supported())
2736 return 0;
2737
2738 if (link->flags & IFF_LOOPBACK)
2739 return 0;
2740
2741 if (!link->network)
2742 return 0;
2743
2744 if (link->network->ipv6_dad_transmits < 0)
2745 return 0;
2746
2747 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/dad_transmits");
2748 xsprintf(buf, "%i", link->network->ipv6_dad_transmits);
2749
2750 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2751 if (r < 0)
2752 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2753
2754 return 0;
2755 }
2756
2757 static int link_set_ipv6_hop_limit(Link *link) {
2758 char buf[DECIMAL_STR_MAX(int) + 1];
2759 const char *p = NULL;
2760 int r;
2761
2762 /* Make this a NOP if IPv6 is not available */
2763 if (!socket_ipv6_is_supported())
2764 return 0;
2765
2766 if (link->flags & IFF_LOOPBACK)
2767 return 0;
2768
2769 if (!link->network)
2770 return 0;
2771
2772 if (link->network->ipv6_hop_limit < 0)
2773 return 0;
2774
2775 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/hop_limit");
2776 xsprintf(buf, "%i", link->network->ipv6_hop_limit);
2777
2778 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2779 if (r < 0)
2780 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2781
2782 return 0;
2783 }
2784
2785 static int link_set_ipv6_mtu(Link *link) {
2786 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2787 const char *p = NULL;
2788 int r;
2789
2790 /* Make this a NOP if IPv6 is not available */
2791 if (!socket_ipv6_is_supported())
2792 return 0;
2793
2794 if (link->flags & IFF_LOOPBACK)
2795 return 0;
2796
2797 if (link->network->ipv6_mtu == 0)
2798 return 0;
2799
2800 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/mtu");
2801
2802 xsprintf(buf, "%" PRIu32, link->network->ipv6_mtu);
2803
2804 r = write_string_file(p, buf, WRITE_STRING_FILE_DISABLE_BUFFER);
2805 if (r < 0)
2806 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2807
2808 return 0;
2809 }
2810
2811 static bool link_is_static_address_configured(Link *link, Address *address) {
2812 Address *net_address;
2813
2814 assert(link);
2815 assert(address);
2816
2817 if (!link->network)
2818 return false;
2819
2820 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2821 if (address_equal(net_address, address))
2822 return true;
2823
2824 return false;
2825 }
2826
2827 static bool link_is_static_route_configured(Link *link, Route *route) {
2828 Route *net_route;
2829
2830 assert(link);
2831 assert(route);
2832
2833 if (!link->network)
2834 return false;
2835
2836 LIST_FOREACH(routes, net_route, link->network->static_routes)
2837 if (route_equal(net_route, route))
2838 return true;
2839
2840 return false;
2841 }
2842
2843 static int link_drop_foreign_config(Link *link) {
2844 Address *address;
2845 Route *route;
2846 Iterator i;
2847 int r;
2848
2849 SET_FOREACH(address, link->addresses_foreign, i) {
2850 /* we consider IPv6LL addresses to be managed by the kernel */
2851 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2852 continue;
2853
2854 if (link_is_static_address_configured(link, address)) {
2855 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2856 if (r < 0)
2857 return log_link_error_errno(link, r, "Failed to add address: %m");
2858 } else {
2859 r = address_remove(address, link, NULL);
2860 if (r < 0)
2861 return r;
2862 }
2863 }
2864
2865 SET_FOREACH(route, link->routes_foreign, i) {
2866 /* do not touch routes managed by the kernel */
2867 if (route->protocol == RTPROT_KERNEL)
2868 continue;
2869
2870 if (link_is_static_route_configured(link, route)) {
2871 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2872 if (r < 0)
2873 return r;
2874 } else {
2875 r = route_remove(route, link, NULL);
2876 if (r < 0)
2877 return r;
2878 }
2879 }
2880
2881 return 0;
2882 }
2883
2884 static int link_drop_config(Link *link) {
2885 Address *address, *pool_address;
2886 Route *route;
2887 Iterator i;
2888 int r;
2889
2890 SET_FOREACH(address, link->addresses, i) {
2891 /* we consider IPv6LL addresses to be managed by the kernel */
2892 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2893 continue;
2894
2895 r = address_remove(address, link, NULL);
2896 if (r < 0)
2897 return r;
2898
2899 /* If this address came from an address pool, clean up the pool */
2900 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2901 if (address_equal(address, pool_address)) {
2902 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2903 address_free(pool_address);
2904 break;
2905 }
2906 }
2907 }
2908
2909 SET_FOREACH(route, link->routes, i) {
2910 /* do not touch routes managed by the kernel */
2911 if (route->protocol == RTPROT_KERNEL)
2912 continue;
2913
2914 r = route_remove(route, link, NULL);
2915 if (r < 0)
2916 return r;
2917 }
2918
2919 ndisc_flush(link);
2920
2921 return 0;
2922 }
2923
2924 static int link_update_lldp(Link *link) {
2925 int r;
2926
2927 assert(link);
2928
2929 if (!link->lldp)
2930 return 0;
2931
2932 if (link->flags & IFF_UP) {
2933 r = sd_lldp_start(link->lldp);
2934 if (r > 0)
2935 log_link_debug(link, "Started LLDP.");
2936 } else {
2937 r = sd_lldp_stop(link->lldp);
2938 if (r > 0)
2939 log_link_debug(link, "Stopped LLDP.");
2940 }
2941
2942 return r;
2943 }
2944
2945 static int link_configure_can(Link *link) {
2946 int r;
2947
2948 if (streq_ptr(link->kind, "can")) {
2949 /* The CAN interface must be down to configure bitrate, etc... */
2950 if ((link->flags & IFF_UP)) {
2951 r = link_down(link);
2952 if (r < 0) {
2953 link_enter_failed(link);
2954 return r;
2955 }
2956
2957 return 0;
2958 }
2959
2960 return link_set_can(link);
2961 }
2962
2963 if (!(link->flags & IFF_UP)) {
2964 r = link_up_can(link);
2965 if (r < 0) {
2966 link_enter_failed(link);
2967 return r;
2968 }
2969 }
2970
2971 return 0;
2972 }
2973
2974 static int link_configure(Link *link) {
2975 int r;
2976
2977 assert(link);
2978 assert(link->network);
2979 assert(link->state == LINK_STATE_PENDING);
2980
2981 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
2982 return link_configure_can(link);
2983
2984 /* Drop foreign config, but ignore loopback or critical devices.
2985 * We do not want to remove loopback address or addresses used for root NFS. */
2986 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2987 r = link_drop_foreign_config(link);
2988 if (r < 0)
2989 return r;
2990 }
2991
2992 r = link_set_proxy_arp(link);
2993 if (r < 0)
2994 return r;
2995
2996 r = ipv6_proxy_ndp_addresses_configure(link);
2997 if (r < 0)
2998 return r;
2999
3000 r = link_set_ipv4_forward(link);
3001 if (r < 0)
3002 return r;
3003
3004 r = link_set_ipv6_forward(link);
3005 if (r < 0)
3006 return r;
3007
3008 r = link_set_ipv6_privacy_extensions(link);
3009 if (r < 0)
3010 return r;
3011
3012 r = link_set_ipv6_accept_ra(link);
3013 if (r < 0)
3014 return r;
3015
3016 r = link_set_ipv6_dad_transmits(link);
3017 if (r < 0)
3018 return r;
3019
3020 r = link_set_ipv6_hop_limit(link);
3021 if (r < 0)
3022 return r;
3023
3024 r = link_set_flags(link);
3025 if (r < 0)
3026 return r;
3027
3028 r = link_set_ipv6_mtu(link);
3029 if (r < 0)
3030 return r;
3031
3032 if (link_ipv4ll_enabled(link)) {
3033 r = ipv4ll_configure(link);
3034 if (r < 0)
3035 return r;
3036 }
3037
3038 if (link_dhcp4_enabled(link)) {
3039 r = dhcp4_set_promote_secondaries(link);
3040 if (r < 0)
3041 return r;
3042
3043 r = dhcp4_configure(link);
3044 if (r < 0)
3045 return r;
3046 }
3047
3048 if (link_dhcp4_server_enabled(link)) {
3049 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
3050 if (r < 0)
3051 return r;
3052
3053 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
3054 if (r < 0)
3055 return r;
3056 }
3057
3058 if (link_dhcp6_enabled(link) ||
3059 link_ipv6_accept_ra_enabled(link)) {
3060 r = dhcp6_configure(link);
3061 if (r < 0)
3062 return r;
3063 }
3064
3065 if (link_ipv6_accept_ra_enabled(link)) {
3066 r = ndisc_configure(link);
3067 if (r < 0)
3068 return r;
3069 }
3070
3071 if (link_radv_enabled(link)) {
3072 r = radv_configure(link);
3073 if (r < 0)
3074 return r;
3075 }
3076
3077 if (link_lldp_rx_enabled(link)) {
3078 r = sd_lldp_new(&link->lldp);
3079 if (r < 0)
3080 return r;
3081
3082 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
3083 if (r < 0)
3084 return r;
3085
3086 r = sd_lldp_match_capabilities(link->lldp,
3087 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
3088 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
3089 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
3090 if (r < 0)
3091 return r;
3092
3093 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
3094 if (r < 0)
3095 return r;
3096
3097 r = sd_lldp_attach_event(link->lldp, NULL, 0);
3098 if (r < 0)
3099 return r;
3100
3101 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
3102 if (r < 0)
3103 return r;
3104
3105 r = link_update_lldp(link);
3106 if (r < 0)
3107 return r;
3108 }
3109
3110 if (link->network->mtu > 0) {
3111 r = link_set_mtu(link, link->network->mtu);
3112 if (r < 0)
3113 return r;
3114 }
3115
3116 if (socket_ipv6_is_supported()) {
3117 r = link_configure_addrgen_mode(link);
3118 if (r < 0)
3119 return r;
3120 }
3121
3122 return link_configure_after_setting_mtu(link);
3123 }
3124
3125 static int link_configure_after_setting_mtu(Link *link) {
3126 int r;
3127
3128 assert(link);
3129 assert(link->network);
3130 assert(link->state == LINK_STATE_PENDING);
3131
3132 if (link->setting_mtu)
3133 return 0;
3134
3135 if (link_has_carrier(link) || link->network->configure_without_carrier) {
3136 r = link_acquire_conf(link);
3137 if (r < 0)
3138 return r;
3139 }
3140
3141 return link_enter_join_netdev(link);
3142 }
3143
3144 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3145 assert(duid);
3146
3147 if (duid->raw_data_len > 0)
3148 return 0;
3149
3150 if (duid->type != DUID_TYPE_UUID)
3151 return -EINVAL;
3152
3153 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3154 duid->raw_data_len = sizeof(sd_id128_t);
3155
3156 return 1;
3157 }
3158
3159 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3160 Manager *manager = userdata;
3161 const sd_bus_error *e;
3162 const void *a;
3163 size_t sz;
3164 DUID *duid;
3165 Link *link;
3166 int r;
3167
3168 assert(m);
3169 assert(manager);
3170
3171 e = sd_bus_message_get_error(m);
3172 if (e) {
3173 log_error_errno(sd_bus_error_get_errno(e),
3174 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3175 e->message);
3176 goto configure;
3177 }
3178
3179 r = sd_bus_message_read_array(m, 'y', &a, &sz);
3180 if (r < 0)
3181 goto configure;
3182
3183 if (sz != sizeof(sd_id128_t)) {
3184 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3185 goto configure;
3186 }
3187
3188 memcpy(&manager->product_uuid, a, sz);
3189 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3190 (void) duid_set_uuid(duid, manager->product_uuid);
3191
3192 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3193
3194 configure:
3195 while ((link = set_steal_first(manager->links_requesting_uuid))) {
3196 r = link_configure(link);
3197 if (r < 0)
3198 log_link_error_errno(link, r, "Failed to configure link: %m");
3199 }
3200
3201 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3202
3203 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3204 * even if the method fails. */
3205 manager->has_product_uuid = true;
3206
3207 return 1;
3208 }
3209
3210 static bool link_requires_uuid(Link *link) {
3211 const DUID *duid;
3212
3213 assert(link);
3214 assert(link->manager);
3215 assert(link->network);
3216
3217 duid = link_get_duid(link);
3218 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3219 return false;
3220
3221 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3222 return true;
3223
3224 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3225 return true;
3226
3227 return false;
3228 }
3229
3230 static int link_configure_duid(Link *link) {
3231 Manager *m;
3232 DUID *duid;
3233 int r;
3234
3235 assert(link);
3236 assert(link->manager);
3237 assert(link->network);
3238
3239 m = link->manager;
3240 duid = link_get_duid(link);
3241
3242 if (!link_requires_uuid(link))
3243 return 1;
3244
3245 if (m->has_product_uuid) {
3246 (void) duid_set_uuid(duid, m->product_uuid);
3247 return 1;
3248 }
3249
3250 if (!m->links_requesting_uuid) {
3251 r = manager_request_product_uuid(m, link);
3252 if (r < 0) {
3253 if (r == -ENOMEM)
3254 return r;
3255
3256 log_link_warning_errno(link, r,
3257 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3258 return 1;
3259 }
3260 } else {
3261 r = set_put(m->links_requesting_uuid, link);
3262 if (r < 0)
3263 return log_oom();
3264
3265 r = set_put(m->duids_requesting_uuid, duid);
3266 if (r < 0)
3267 return log_oom();
3268 }
3269
3270 return 0;
3271 }
3272
3273 static int link_initialized_and_synced(Link *link) {
3274 Network *network;
3275 int r;
3276
3277 assert(link);
3278 assert(link->ifname);
3279 assert(link->manager);
3280
3281 if (link->state != LINK_STATE_PENDING)
3282 return 1;
3283
3284 log_link_debug(link, "Link state is up-to-date");
3285
3286 r = link_new_bound_by_list(link);
3287 if (r < 0)
3288 return r;
3289
3290 r = link_handle_bound_by_list(link);
3291 if (r < 0)
3292 return r;
3293
3294 if (!link->network) {
3295 r = network_get(link->manager, link->sd_device, link->ifname,
3296 &link->mac, &network);
3297 if (r == -ENOENT) {
3298 link_enter_unmanaged(link);
3299 return 1;
3300 } else if (r == 0 && network->unmanaged) {
3301 link_enter_unmanaged(link);
3302 return 0;
3303 } else if (r < 0)
3304 return r;
3305
3306 if (link->flags & IFF_LOOPBACK) {
3307 if (network->link_local != ADDRESS_FAMILY_NO)
3308 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3309
3310 if (network->dhcp != ADDRESS_FAMILY_NO)
3311 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3312
3313 if (network->dhcp_server)
3314 log_link_debug(link, "Ignoring DHCP server for loopback link");
3315 }
3316
3317 r = network_apply(network, link);
3318 if (r < 0)
3319 return r;
3320 }
3321
3322 r = link_new_bound_to_list(link);
3323 if (r < 0)
3324 return r;
3325
3326 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3327 * link_configure() is called later asynchronously. */
3328 r = link_configure_duid(link);
3329 if (r <= 0)
3330 return r;
3331
3332 r = link_configure(link);
3333 if (r < 0)
3334 return r;
3335
3336 return 1;
3337 }
3338
3339 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3340 (void) link_initialized_and_synced(link);
3341 return 1;
3342 }
3343
3344 int link_initialized(Link *link, sd_device *device) {
3345 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3346 int r;
3347
3348 assert(link);
3349 assert(link->manager);
3350 assert(link->manager->rtnl);
3351 assert(device);
3352
3353 if (link->state != LINK_STATE_PENDING)
3354 return 0;
3355
3356 if (link->sd_device)
3357 return 0;
3358
3359 log_link_debug(link, "udev initialized link");
3360
3361 link->sd_device = sd_device_ref(device);
3362
3363 /* udev has initialized the link, but we don't know if we have yet
3364 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3365 * when it returns we know that the pending NEWLINKs have already been
3366 * processed and that we are up-to-date */
3367
3368 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3369 link->ifindex);
3370 if (r < 0)
3371 return r;
3372
3373 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3374 link_netlink_destroy_callback, link);
3375 if (r < 0)
3376 return r;
3377
3378 link_ref(link);
3379
3380 return 0;
3381 }
3382
3383 static int link_load(Link *link) {
3384 _cleanup_free_ char *network_file = NULL,
3385 *addresses = NULL,
3386 *routes = NULL,
3387 *dhcp4_address = NULL,
3388 *ipv4ll_address = NULL;
3389 union in_addr_union address;
3390 union in_addr_union route_dst;
3391 const char *p;
3392 int r;
3393
3394 assert(link);
3395
3396 r = parse_env_file(NULL, link->state_file,
3397 "NETWORK_FILE", &network_file,
3398 "ADDRESSES", &addresses,
3399 "ROUTES", &routes,
3400 "DHCP4_ADDRESS", &dhcp4_address,
3401 "IPV4LL_ADDRESS", &ipv4ll_address);
3402 if (r < 0 && r != -ENOENT)
3403 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3404
3405 if (network_file) {
3406 Network *network;
3407 char *suffix;
3408
3409 /* drop suffix */
3410 suffix = strrchr(network_file, '.');
3411 if (!suffix) {
3412 log_link_debug(link, "Failed to get network name from %s", network_file);
3413 goto network_file_fail;
3414 }
3415 *suffix = '\0';
3416
3417 r = network_get_by_name(link->manager, basename(network_file), &network);
3418 if (r < 0) {
3419 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3420 goto network_file_fail;
3421 }
3422
3423 r = network_apply(network, link);
3424 if (r < 0)
3425 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3426 }
3427
3428 network_file_fail:
3429
3430 if (addresses) {
3431 p = addresses;
3432
3433 for (;;) {
3434 _cleanup_free_ char *address_str = NULL;
3435 char *prefixlen_str;
3436 int family;
3437 unsigned char prefixlen;
3438
3439 r = extract_first_word(&p, &address_str, NULL, 0);
3440 if (r < 0) {
3441 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3442 continue;
3443 }
3444 if (r == 0)
3445 break;
3446
3447 prefixlen_str = strchr(address_str, '/');
3448 if (!prefixlen_str) {
3449 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3450 continue;
3451 }
3452
3453 *prefixlen_str++ = '\0';
3454
3455 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3456 if (r != 1) {
3457 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3458 continue;
3459 }
3460
3461 r = in_addr_from_string_auto(address_str, &family, &address);
3462 if (r < 0) {
3463 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3464 continue;
3465 }
3466
3467 r = address_add(link, family, &address, prefixlen, NULL);
3468 if (r < 0)
3469 return log_link_error_errno(link, r, "Failed to add address: %m");
3470 }
3471 }
3472
3473 if (routes) {
3474 p = routes;
3475
3476 for (;;) {
3477 Route *route;
3478 _cleanup_free_ char *route_str = NULL;
3479 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3480 usec_t lifetime;
3481 char *prefixlen_str;
3482 int family;
3483 unsigned char prefixlen, tos, table;
3484 uint32_t priority;
3485
3486 r = extract_first_word(&p, &route_str, NULL, 0);
3487 if (r < 0) {
3488 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3489 continue;
3490 }
3491 if (r == 0)
3492 break;
3493
3494 prefixlen_str = strchr(route_str, '/');
3495 if (!prefixlen_str) {
3496 log_link_debug(link, "Failed to parse route %s", route_str);
3497 continue;
3498 }
3499
3500 *prefixlen_str++ = '\0';
3501
3502 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3503 if (r != 5) {
3504 log_link_debug(link,
3505 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3506 prefixlen_str);
3507 continue;
3508 }
3509
3510 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3511 if (r < 0) {
3512 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3513 continue;
3514 }
3515
3516 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3517 if (r < 0)
3518 return log_link_error_errno(link, r, "Failed to add route: %m");
3519
3520 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3521 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3522 0, route_expire_handler, route);
3523 if (r < 0)
3524 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3525 }
3526
3527 route->lifetime = lifetime;
3528 sd_event_source_unref(route->expire);
3529 route->expire = TAKE_PTR(expire);
3530 }
3531 }
3532
3533 if (dhcp4_address) {
3534 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3535 if (r < 0) {
3536 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3537 goto dhcp4_address_fail;
3538 }
3539
3540 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3541 if (r < 0)
3542 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3543
3544 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3545 if (r < 0)
3546 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3547 }
3548
3549 dhcp4_address_fail:
3550
3551 if (ipv4ll_address) {
3552 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3553 if (r < 0) {
3554 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3555 goto ipv4ll_address_fail;
3556 }
3557
3558 r = sd_ipv4ll_new(&link->ipv4ll);
3559 if (r < 0)
3560 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3561
3562 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3563 if (r < 0)
3564 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3565 }
3566
3567 ipv4ll_address_fail:
3568
3569 return 0;
3570 }
3571
3572 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3573 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3574 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3575 Link *link;
3576 int r;
3577
3578 assert(m);
3579 assert(m->rtnl);
3580 assert(message);
3581 assert(ret);
3582
3583 r = link_new(m, message, ret);
3584 if (r < 0)
3585 return r;
3586
3587 link = *ret;
3588
3589 log_link_debug(link, "Link %d added", link->ifindex);
3590
3591 r = link_load(link);
3592 if (r < 0)
3593 return r;
3594
3595 if (detect_container() <= 0) {
3596 /* not in a container, udev will be around */
3597 sprintf(ifindex_str, "n%d", link->ifindex);
3598 r = sd_device_new_from_device_id(&device, ifindex_str);
3599 if (r < 0) {
3600 log_link_warning_errno(link, r, "Could not find device: %m");
3601 goto failed;
3602 }
3603
3604 r = sd_device_get_is_initialized(device);
3605 if (r < 0) {
3606 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3607 goto failed;
3608 }
3609 if (r == 0) {
3610 /* not yet ready */
3611 log_link_debug(link, "link pending udev initialization...");
3612 return 0;
3613 }
3614
3615 r = link_initialized(link, device);
3616 if (r < 0)
3617 goto failed;
3618 } else {
3619 r = link_initialized_and_synced(link);
3620 if (r < 0)
3621 goto failed;
3622 }
3623
3624 return 0;
3625 failed:
3626 link_enter_failed(link);
3627 return r;
3628 }
3629
3630 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3631 int r;
3632
3633 assert(link);
3634
3635 log_link_info(link, "Gained IPv6LL");
3636
3637 link->ipv6ll_address = *address;
3638 link_check_ready(link);
3639
3640 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3641 r = link_acquire_ipv6_conf(link);
3642 if (r < 0) {
3643 link_enter_failed(link);
3644 return r;
3645 }
3646 }
3647
3648 return 0;
3649 }
3650
3651 static int link_carrier_gained(Link *link) {
3652 int r;
3653
3654 assert(link);
3655
3656 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3657 r = link_acquire_conf(link);
3658 if (r < 0) {
3659 link_enter_failed(link);
3660 return r;
3661 }
3662
3663 r = link_request_set_addresses(link);
3664 if (r < 0)
3665 return r;
3666 }
3667
3668 r = link_handle_bound_by_list(link);
3669 if (r < 0)
3670 return r;
3671
3672 return 0;
3673 }
3674
3675 static int link_carrier_lost(Link *link) {
3676 int r;
3677
3678 assert(link);
3679
3680 if (link->network && link->network->ignore_carrier_loss)
3681 return 0;
3682
3683 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3684 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3685 * configuration and stop the clients as well. */
3686 if (link->setting_mtu)
3687 return 0;
3688
3689 r = link_stop_clients(link);
3690 if (r < 0) {
3691 link_enter_failed(link);
3692 return r;
3693 }
3694
3695 if (link_dhcp4_server_enabled(link))
3696 (void) sd_dhcp_server_stop(link->dhcp_server);
3697
3698 r = link_drop_config(link);
3699 if (r < 0)
3700 return r;
3701
3702 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3703 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3704 r = link_drop_foreign_config(link);
3705 if (r < 0)
3706 return r;
3707 }
3708
3709 r = link_handle_bound_by_list(link);
3710 if (r < 0)
3711 return r;
3712
3713 return 0;
3714 }
3715
3716 int link_carrier_reset(Link *link) {
3717 int r;
3718
3719 assert(link);
3720
3721 if (link_has_carrier(link)) {
3722 r = link_carrier_lost(link);
3723 if (r < 0)
3724 return r;
3725
3726 r = link_carrier_gained(link);
3727 if (r < 0)
3728 return r;
3729
3730 log_link_info(link, "Reset carrier");
3731 }
3732
3733 return 0;
3734 }
3735
3736 int link_update(Link *link, sd_netlink_message *m) {
3737 struct ether_addr mac;
3738 const char *ifname;
3739 uint32_t mtu;
3740 bool had_carrier, carrier_gained, carrier_lost;
3741 int r;
3742
3743 assert(link);
3744 assert(link->ifname);
3745 assert(m);
3746
3747 if (link->state == LINK_STATE_LINGER) {
3748 log_link_info(link, "Link readded");
3749 link_set_state(link, LINK_STATE_CONFIGURING);
3750
3751 r = link_new_carrier_maps(link);
3752 if (r < 0)
3753 return r;
3754 }
3755
3756 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3757 if (r >= 0 && !streq(ifname, link->ifname)) {
3758 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3759
3760 if (link->state == LINK_STATE_PENDING) {
3761 r = free_and_strdup(&link->ifname, ifname);
3762 if (r < 0)
3763 return r;
3764 } else {
3765 Manager *manager = link->manager;
3766
3767 link_drop(link);
3768 r = link_add(manager, m, &link);
3769 if (r < 0)
3770 return r;
3771 }
3772 }
3773
3774 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3775 if (r >= 0 && mtu > 0) {
3776 link->mtu = mtu;
3777 if (link->original_mtu == 0) {
3778 link->original_mtu = mtu;
3779 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3780 }
3781
3782 if (link->dhcp_client) {
3783 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3784 link->mtu);
3785 if (r < 0)
3786 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3787 }
3788
3789 if (link->radv) {
3790 r = sd_radv_set_mtu(link->radv, link->mtu);
3791 if (r < 0)
3792 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3793 }
3794 }
3795
3796 /* The kernel may broadcast NEWLINK messages without the MAC address
3797 set, simply ignore them. */
3798 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3799 if (r >= 0) {
3800 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3801 ETH_ALEN)) {
3802
3803 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3804 ETH_ALEN);
3805
3806 log_link_debug(link, "MAC address: "
3807 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3808 mac.ether_addr_octet[0],
3809 mac.ether_addr_octet[1],
3810 mac.ether_addr_octet[2],
3811 mac.ether_addr_octet[3],
3812 mac.ether_addr_octet[4],
3813 mac.ether_addr_octet[5]);
3814
3815 if (link->ipv4ll) {
3816 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3817 if (r < 0)
3818 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3819 }
3820
3821 if (link->dhcp_client) {
3822 r = sd_dhcp_client_set_mac(link->dhcp_client,
3823 (const uint8_t *) &link->mac,
3824 sizeof (link->mac),
3825 ARPHRD_ETHER);
3826 if (r < 0)
3827 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3828
3829 r = dhcp4_set_client_identifier(link);
3830 if (r < 0)
3831 return r;
3832 }
3833
3834 if (link->dhcp6_client) {
3835 const DUID* duid = link_get_duid(link);
3836
3837 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3838 (const uint8_t *) &link->mac,
3839 sizeof (link->mac),
3840 ARPHRD_ETHER);
3841 if (r < 0)
3842 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3843
3844 if (link->network->iaid_set) {
3845 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3846 link->network->iaid);
3847 if (r < 0)
3848 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3849 }
3850
3851 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3852 duid->type,
3853 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3854 duid->raw_data_len);
3855 if (r < 0)
3856 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3857 }
3858
3859 if (link->radv) {
3860 r = sd_radv_set_mac(link->radv, &link->mac);
3861 if (r < 0)
3862 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3863 }
3864
3865 if (link->ndisc) {
3866 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3867 if (r < 0)
3868 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3869 }
3870 }
3871 }
3872
3873 had_carrier = link_has_carrier(link);
3874
3875 r = link_update_flags(link, m);
3876 if (r < 0)
3877 return r;
3878
3879 r = link_update_lldp(link);
3880 if (r < 0)
3881 return r;
3882
3883 carrier_gained = !had_carrier && link_has_carrier(link);
3884 carrier_lost = had_carrier && !link_has_carrier(link);
3885
3886 if (carrier_gained) {
3887 log_link_info(link, "Gained carrier");
3888
3889 r = link_carrier_gained(link);
3890 if (r < 0)
3891 return r;
3892 } else if (carrier_lost) {
3893 log_link_info(link, "Lost carrier");
3894
3895 r = link_carrier_lost(link);
3896 if (r < 0)
3897 return r;
3898 }
3899
3900 return 0;
3901 }
3902
3903 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3904 bool space = false;
3905 Iterator i;
3906 Link *link;
3907
3908 assert(f);
3909 assert(prefix);
3910
3911 if (hashmap_isempty(h))
3912 return;
3913
3914 fputs(prefix, f);
3915 HASHMAP_FOREACH(link, h, i) {
3916 if (space)
3917 fputc(' ', f);
3918
3919 fprintf(f, "%i", link->ifindex);
3920 space = true;
3921 }
3922
3923 fputc('\n', f);
3924 }
3925
3926 int link_save(Link *link) {
3927 _cleanup_free_ char *temp_path = NULL;
3928 _cleanup_fclose_ FILE *f = NULL;
3929 const char *admin_state, *oper_state;
3930 Address *a;
3931 Route *route;
3932 Iterator i;
3933 int r;
3934
3935 assert(link);
3936 assert(link->state_file);
3937 assert(link->lease_file);
3938 assert(link->manager);
3939
3940 if (link->state == LINK_STATE_LINGER) {
3941 unlink(link->state_file);
3942 return 0;
3943 }
3944
3945 link_lldp_save(link);
3946
3947 admin_state = link_state_to_string(link->state);
3948 assert(admin_state);
3949
3950 oper_state = link_operstate_to_string(link->operstate);
3951 assert(oper_state);
3952
3953 r = fopen_temporary(link->state_file, &f, &temp_path);
3954 if (r < 0)
3955 goto fail;
3956
3957 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
3958 (void) fchmod(fileno(f), 0644);
3959
3960 fprintf(f,
3961 "# This is private data. Do not parse.\n"
3962 "ADMIN_STATE=%s\n"
3963 "OPER_STATE=%s\n",
3964 admin_state, oper_state);
3965
3966 if (link->network) {
3967 bool space;
3968 sd_dhcp6_lease *dhcp6_lease = NULL;
3969 const char *dhcp_domainname = NULL;
3970 char **dhcp6_domains = NULL;
3971 char **dhcp_domains = NULL;
3972 unsigned j;
3973
3974 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3975 yes_no(link->network->required_for_online));
3976
3977 if (link->dhcp6_client) {
3978 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3979 if (r < 0 && r != -ENOMSG)
3980 log_link_debug(link, "No DHCPv6 lease");
3981 }
3982
3983 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3984
3985 fputs("DNS=", f);
3986 space = false;
3987
3988 for (j = 0; j < link->network->n_dns; j++) {
3989 _cleanup_free_ char *b = NULL;
3990
3991 r = in_addr_to_string(link->network->dns[j].family,
3992 &link->network->dns[j].address, &b);
3993 if (r < 0) {
3994 log_debug_errno(r, "Failed to format address, ignoring: %m");
3995 continue;
3996 }
3997
3998 if (space)
3999 fputc(' ', f);
4000 fputs(b, f);
4001 space = true;
4002 }
4003
4004 if (link->network->dhcp_use_dns &&
4005 link->dhcp_lease) {
4006 const struct in_addr *addresses;
4007
4008 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
4009 if (r > 0)
4010 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4011 space = true;
4012 }
4013
4014 if (link->network->dhcp_use_dns && dhcp6_lease) {
4015 struct in6_addr *in6_addrs;
4016
4017 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
4018 if (r > 0) {
4019 if (space)
4020 fputc(' ', f);
4021 serialize_in6_addrs(f, in6_addrs, r);
4022 space = true;
4023 }
4024 }
4025
4026 /* Make sure to flush out old entries before we use the NDISC data */
4027 ndisc_vacuum(link);
4028
4029 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4030 NDiscRDNSS *dd;
4031
4032 SET_FOREACH(dd, link->ndisc_rdnss, i) {
4033 if (space)
4034 fputc(' ', f);
4035
4036 serialize_in6_addrs(f, &dd->address, 1);
4037 space = true;
4038 }
4039 }
4040
4041 fputc('\n', f);
4042
4043 fputs("NTP=", f);
4044 space = false;
4045 fputstrv(f, link->network->ntp, NULL, &space);
4046
4047 if (link->network->dhcp_use_ntp &&
4048 link->dhcp_lease) {
4049 const struct in_addr *addresses;
4050
4051 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
4052 if (r > 0)
4053 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4054 space = true;
4055 }
4056
4057 if (link->network->dhcp_use_ntp && dhcp6_lease) {
4058 struct in6_addr *in6_addrs;
4059 char **hosts;
4060
4061 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
4062 &in6_addrs);
4063 if (r > 0) {
4064 if (space)
4065 fputc(' ', f);
4066 serialize_in6_addrs(f, in6_addrs, r);
4067 space = true;
4068 }
4069
4070 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
4071 if (r > 0)
4072 fputstrv(f, hosts, NULL, &space);
4073 }
4074
4075 fputc('\n', f);
4076
4077 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4078 if (link->dhcp_lease) {
4079 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4080 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4081 }
4082 if (dhcp6_lease)
4083 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4084 }
4085
4086 fputs("DOMAINS=", f);
4087 space = false;
4088 fputstrv(f, link->network->search_domains, NULL, &space);
4089
4090 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4091 NDiscDNSSL *dd;
4092
4093 if (dhcp_domainname)
4094 fputs_with_space(f, dhcp_domainname, NULL, &space);
4095 if (dhcp_domains)
4096 fputstrv(f, dhcp_domains, NULL, &space);
4097 if (dhcp6_domains)
4098 fputstrv(f, dhcp6_domains, NULL, &space);
4099
4100 SET_FOREACH(dd, link->ndisc_dnssl, i)
4101 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4102 }
4103
4104 fputc('\n', f);
4105
4106 fputs("ROUTE_DOMAINS=", f);
4107 space = false;
4108 fputstrv(f, link->network->route_domains, NULL, &space);
4109
4110 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4111 NDiscDNSSL *dd;
4112
4113 if (dhcp_domainname)
4114 fputs_with_space(f, dhcp_domainname, NULL, &space);
4115 if (dhcp_domains)
4116 fputstrv(f, dhcp_domains, NULL, &space);
4117 if (dhcp6_domains)
4118 fputstrv(f, dhcp6_domains, NULL, &space);
4119
4120 SET_FOREACH(dd, link->ndisc_dnssl, i)
4121 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4122 }
4123
4124 fputc('\n', f);
4125
4126 fprintf(f, "LLMNR=%s\n",
4127 resolve_support_to_string(link->network->llmnr));
4128 fprintf(f, "MDNS=%s\n",
4129 resolve_support_to_string(link->network->mdns));
4130 if (link->network->dns_default_route >= 0)
4131 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
4132
4133 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4134 fprintf(f, "DNS_OVER_TLS=%s\n",
4135 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
4136
4137 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
4138 fprintf(f, "DNSSEC=%s\n",
4139 dnssec_mode_to_string(link->network->dnssec_mode));
4140
4141 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
4142 const char *n;
4143
4144 fputs("DNSSEC_NTA=", f);
4145 space = false;
4146 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
4147 fputs_with_space(f, n, NULL, &space);
4148 fputc('\n', f);
4149 }
4150
4151 fputs("ADDRESSES=", f);
4152 space = false;
4153 SET_FOREACH(a, link->addresses, i) {
4154 _cleanup_free_ char *address_str = NULL;
4155
4156 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4157 if (r < 0)
4158 goto fail;
4159
4160 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4161 space = true;
4162 }
4163 fputc('\n', f);
4164
4165 fputs("ROUTES=", f);
4166 space = false;
4167 SET_FOREACH(route, link->routes, i) {
4168 _cleanup_free_ char *route_str = NULL;
4169
4170 r = in_addr_to_string(route->family, &route->dst, &route_str);
4171 if (r < 0)
4172 goto fail;
4173
4174 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4175 space ? " " : "", route_str,
4176 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4177 space = true;
4178 }
4179
4180 fputc('\n', f);
4181 }
4182
4183 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4184 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4185
4186 if (link->dhcp_lease) {
4187 struct in_addr address;
4188 const char *tz = NULL;
4189
4190 assert(link->network);
4191
4192 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
4193 if (r >= 0)
4194 fprintf(f, "TIMEZONE=%s\n", tz);
4195
4196 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
4197 if (r >= 0) {
4198 fputs("DHCP4_ADDRESS=", f);
4199 serialize_in_addrs(f, &address, 1, false, NULL);
4200 fputc('\n', f);
4201 }
4202
4203 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4204 if (r < 0)
4205 goto fail;
4206
4207 fprintf(f,
4208 "DHCP_LEASE=%s\n",
4209 link->lease_file);
4210 } else
4211 unlink(link->lease_file);
4212
4213 if (link->ipv4ll) {
4214 struct in_addr address;
4215
4216 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4217 if (r >= 0) {
4218 fputs("IPV4LL_ADDRESS=", f);
4219 serialize_in_addrs(f, &address, 1, false, NULL);
4220 fputc('\n', f);
4221 }
4222 }
4223
4224 r = fflush_and_check(f);
4225 if (r < 0)
4226 goto fail;
4227
4228 if (rename(temp_path, link->state_file) < 0) {
4229 r = -errno;
4230 goto fail;
4231 }
4232
4233 return 0;
4234
4235 fail:
4236 (void) unlink(link->state_file);
4237 if (temp_path)
4238 (void) unlink(temp_path);
4239
4240 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4241 }
4242
4243 /* The serialized state in /run is no longer up-to-date. */
4244 void link_dirty(Link *link) {
4245 int r;
4246
4247 assert(link);
4248
4249 /* mark manager dirty as link is dirty */
4250 manager_dirty(link->manager);
4251
4252 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
4253 if (r < 0)
4254 /* allocation errors are ignored */
4255 return;
4256
4257 r = set_put(link->manager->dirty_links, link);
4258 if (r <= 0)
4259 /* don't take another ref if the link was already dirty */
4260 return;
4261
4262 link_ref(link);
4263 }
4264
4265 /* The serialized state in /run is up-to-date */
4266 void link_clean(Link *link) {
4267 assert(link);
4268 assert(link->manager);
4269
4270 link_unref(set_remove(link->manager->dirty_links, link));
4271 }
4272
4273 static const char* const link_state_table[_LINK_STATE_MAX] = {
4274 [LINK_STATE_PENDING] = "pending",
4275 [LINK_STATE_CONFIGURING] = "configuring",
4276 [LINK_STATE_CONFIGURED] = "configured",
4277 [LINK_STATE_UNMANAGED] = "unmanaged",
4278 [LINK_STATE_FAILED] = "failed",
4279 [LINK_STATE_LINGER] = "linger",
4280 };
4281
4282 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
4283
4284 static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
4285 [LINK_OPERSTATE_OFF] = "off",
4286 [LINK_OPERSTATE_NO_CARRIER] = "no-carrier",
4287 [LINK_OPERSTATE_DORMANT] = "dormant",
4288 [LINK_OPERSTATE_CARRIER] = "carrier",
4289 [LINK_OPERSTATE_DEGRADED] = "degraded",
4290 [LINK_OPERSTATE_ENSLAVED] = "enslaved",
4291 [LINK_OPERSTATE_ROUTABLE] = "routable",
4292 };
4293
4294 DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
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