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util-lib: split out env file parsing code into env-file.c
[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 "netlink-util.h"
17 #include "network-internal.h"
18 #include "networkd-ipv6-proxy-ndp.h"
19 #include "networkd-lldp-tx.h"
20 #include "networkd-manager.h"
21 #include "networkd-ndisc.h"
22 #include "networkd-radv.h"
23 #include "networkd-routing-policy-rule.h"
24 #include "set.h"
25 #include "socket-util.h"
26 #include "stdio-util.h"
27 #include "string-table.h"
28 #include "strv.h"
29 #include "tmpfile-util.h"
30 #include "util.h"
31 #include "virt.h"
32
33 DUID* link_get_duid(Link *link) {
34 if (link->network->duid.type != _DUID_TYPE_INVALID)
35 return &link->network->duid;
36 else
37 return &link->manager->duid;
38 }
39
40 static bool link_dhcp6_enabled(Link *link) {
41 assert(link);
42
43 if (!socket_ipv6_is_supported())
44 return false;
45
46 if (link->flags & IFF_LOOPBACK)
47 return false;
48
49 if (!link->network)
50 return false;
51
52 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
53 }
54
55 static bool link_dhcp4_enabled(Link *link) {
56 assert(link);
57
58 if (link->flags & IFF_LOOPBACK)
59 return false;
60
61 if (!link->network)
62 return false;
63
64 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
65 }
66
67 static bool link_dhcp4_server_enabled(Link *link) {
68 assert(link);
69
70 if (link->flags & IFF_LOOPBACK)
71 return false;
72
73 if (!link->network)
74 return false;
75
76 return link->network->dhcp_server;
77 }
78
79 static bool link_ipv4ll_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 (streq_ptr(link->kind, "wireguard"))
89 return false;
90
91 return link->network->link_local & ADDRESS_FAMILY_IPV4;
92 }
93
94 static bool link_ipv6ll_enabled(Link *link) {
95 assert(link);
96
97 if (!socket_ipv6_is_supported())
98 return false;
99
100 if (link->flags & IFF_LOOPBACK)
101 return false;
102
103 if (!link->network)
104 return false;
105
106 if (streq_ptr(link->kind, "wireguard"))
107 return false;
108
109 return link->network->link_local & ADDRESS_FAMILY_IPV6;
110 }
111
112 static bool link_ipv6_enabled(Link *link) {
113 assert(link);
114
115 if (!socket_ipv6_is_supported())
116 return false;
117
118 if (link->network->bridge)
119 return false;
120
121 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
122 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
123 }
124
125 static bool link_radv_enabled(Link *link) {
126 assert(link);
127
128 if (!link_ipv6ll_enabled(link))
129 return false;
130
131 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
132 }
133
134 static bool link_lldp_rx_enabled(Link *link) {
135 assert(link);
136
137 if (link->flags & IFF_LOOPBACK)
138 return false;
139
140 if (link->iftype != ARPHRD_ETHER)
141 return false;
142
143 if (!link->network)
144 return false;
145
146 /* LLDP should be handled on bridge slaves as those have a direct
147 * connection to their peers not on the bridge master. Linux doesn't
148 * even (by default) forward lldp packets to the bridge master.*/
149 if (streq_ptr("bridge", link->kind))
150 return false;
151
152 return link->network->lldp_mode != LLDP_MODE_NO;
153 }
154
155 static bool link_lldp_emit_enabled(Link *link) {
156 assert(link);
157
158 if (link->flags & IFF_LOOPBACK)
159 return false;
160
161 if (link->iftype != ARPHRD_ETHER)
162 return false;
163
164 if (!link->network)
165 return false;
166
167 return link->network->lldp_emit != LLDP_EMIT_NO;
168 }
169
170 static bool link_ipv4_forward_enabled(Link *link) {
171 assert(link);
172
173 if (link->flags & IFF_LOOPBACK)
174 return false;
175
176 if (!link->network)
177 return false;
178
179 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
180 return false;
181
182 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
183 }
184
185 static bool link_ipv6_forward_enabled(Link *link) {
186 assert(link);
187
188 if (!socket_ipv6_is_supported())
189 return false;
190
191 if (link->flags & IFF_LOOPBACK)
192 return false;
193
194 if (!link->network)
195 return false;
196
197 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
198 return false;
199
200 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
201 }
202
203 static bool link_proxy_arp_enabled(Link *link) {
204 assert(link);
205
206 if (link->flags & IFF_LOOPBACK)
207 return false;
208
209 if (!link->network)
210 return false;
211
212 if (link->network->proxy_arp < 0)
213 return false;
214
215 return true;
216 }
217
218 static bool link_ipv6_accept_ra_enabled(Link *link) {
219 assert(link);
220
221 if (!socket_ipv6_is_supported())
222 return false;
223
224 if (link->flags & IFF_LOOPBACK)
225 return false;
226
227 if (!link->network)
228 return false;
229
230 if (!link_ipv6ll_enabled(link))
231 return false;
232
233 /* If unset use system default (enabled if local forwarding is disabled.
234 * disabled if local forwarding is enabled).
235 * If set, ignore or enforce RA independent of local forwarding state.
236 */
237 if (link->network->ipv6_accept_ra < 0)
238 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
239 return !link_ipv6_forward_enabled(link);
240 else if (link->network->ipv6_accept_ra > 0)
241 /* accept RA even if ip_forward is enabled */
242 return true;
243 else
244 /* ignore RA */
245 return false;
246 }
247
248 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
249 assert(link);
250
251 if (!socket_ipv6_is_supported())
252 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
253
254 if (link->flags & IFF_LOOPBACK)
255 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
256
257 if (!link->network)
258 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
259
260 return link->network->ipv6_privacy_extensions;
261 }
262
263 static int link_enable_ipv6(Link *link) {
264 const char *p = NULL;
265 bool disabled;
266 int r;
267
268 if (link->flags & IFF_LOOPBACK)
269 return 0;
270
271 disabled = !link_ipv6_enabled(link);
272
273 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/disable_ipv6");
274
275 r = write_string_file(p, one_zero(disabled), WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
276 if (r < 0)
277 log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m",
278 enable_disable(!disabled), link->ifname);
279 else
280 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
281
282 return 0;
283 }
284
285 void link_update_operstate(Link *link) {
286 LinkOperationalState operstate;
287 assert(link);
288
289 if (link->kernel_operstate == IF_OPER_DORMANT)
290 operstate = LINK_OPERSTATE_DORMANT;
291 else if (link_has_carrier(link)) {
292 Address *address;
293 uint8_t scope = RT_SCOPE_NOWHERE;
294 Iterator i;
295
296 /* if we have carrier, check what addresses we have */
297 SET_FOREACH(address, link->addresses, i) {
298 if (!address_is_ready(address))
299 continue;
300
301 if (address->scope < scope)
302 scope = address->scope;
303 }
304
305 /* for operstate we also take foreign addresses into account */
306 SET_FOREACH(address, link->addresses_foreign, i) {
307 if (!address_is_ready(address))
308 continue;
309
310 if (address->scope < scope)
311 scope = address->scope;
312 }
313
314 if (scope < RT_SCOPE_SITE)
315 /* universally accessible addresses found */
316 operstate = LINK_OPERSTATE_ROUTABLE;
317 else if (scope < RT_SCOPE_HOST)
318 /* only link or site local addresses found */
319 operstate = LINK_OPERSTATE_DEGRADED;
320 else
321 /* no useful addresses found */
322 operstate = LINK_OPERSTATE_CARRIER;
323 } else if (link->flags & IFF_UP)
324 operstate = LINK_OPERSTATE_NO_CARRIER;
325 else
326 operstate = LINK_OPERSTATE_OFF;
327
328 if (link->operstate != operstate) {
329 link->operstate = operstate;
330 link_send_changed(link, "OperationalState", NULL);
331 link_dirty(link);
332 }
333 }
334
335 #define FLAG_STRING(string, flag, old, new) \
336 (((old ^ new) & flag) \
337 ? ((old & flag) ? (" -" string) : (" +" string)) \
338 : "")
339
340 static int link_update_flags(Link *link, sd_netlink_message *m) {
341 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
342 uint8_t operstate;
343 int r;
344
345 assert(link);
346
347 r = sd_rtnl_message_link_get_flags(m, &flags);
348 if (r < 0)
349 return log_link_warning_errno(link, r, "Could not get link flags: %m");
350
351 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
352 if (r < 0)
353 /* if we got a message without operstate, take it to mean
354 the state was unchanged */
355 operstate = link->kernel_operstate;
356
357 if ((link->flags == flags) && (link->kernel_operstate == operstate))
358 return 0;
359
360 if (link->flags != flags) {
361 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",
362 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
363 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
364 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
365 FLAG_STRING("UP", IFF_UP, link->flags, flags),
366 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
367 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
368 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
369 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
370 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
371 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
372 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
373 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
374 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
375 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
376 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
377 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
378 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
379 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
380 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
381
382 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
383 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
384 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
385 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
386 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
387 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
388 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
389 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
390
391 /* link flags are currently at most 18 bits, let's align to
392 * printing 20 */
393 if (unknown_flags_added)
394 log_link_debug(link,
395 "Unknown link flags gained: %#.5x (ignoring)",
396 unknown_flags_added);
397
398 if (unknown_flags_removed)
399 log_link_debug(link,
400 "Unknown link flags lost: %#.5x (ignoring)",
401 unknown_flags_removed);
402 }
403
404 link->flags = flags;
405 link->kernel_operstate = operstate;
406
407 link_update_operstate(link);
408
409 return 0;
410 }
411
412 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_unref);
413
414 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
415 _cleanup_(link_unrefp) Link *link = NULL;
416 uint16_t type;
417 const char *ifname, *kind = NULL;
418 int r, ifindex;
419 unsigned short iftype;
420
421 assert(manager);
422 assert(message);
423 assert(ret);
424
425 /* check for link kind */
426 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
427 if (r == 0) {
428 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
429 r = sd_netlink_message_exit_container(message);
430 if (r < 0)
431 return r;
432 }
433
434 r = sd_netlink_message_get_type(message, &type);
435 if (r < 0)
436 return r;
437 else if (type != RTM_NEWLINK)
438 return -EINVAL;
439
440 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
441 if (r < 0)
442 return r;
443 else if (ifindex <= 0)
444 return -EINVAL;
445
446 r = sd_rtnl_message_link_get_type(message, &iftype);
447 if (r < 0)
448 return r;
449
450 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
451 if (r < 0)
452 return r;
453
454 link = new(Link, 1);
455 if (!link)
456 return -ENOMEM;
457
458 *link = (Link) {
459 .n_ref = 1,
460 .manager = manager,
461 .state = LINK_STATE_PENDING,
462 .rtnl_extended_attrs = true,
463 .ifindex = ifindex,
464 .iftype = iftype,
465 };
466
467 link->ifname = strdup(ifname);
468 if (!link->ifname)
469 return -ENOMEM;
470
471 if (kind) {
472 link->kind = strdup(kind);
473 if (!link->kind)
474 return -ENOMEM;
475 }
476
477 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
478 if (r < 0)
479 log_link_debug_errno(link, r, "New device has no master, continuing without");
480
481 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
482 if (r < 0)
483 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
484
485 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
486 return -ENOMEM;
487
488 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
489 return -ENOMEM;
490
491 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
492 return -ENOMEM;
493
494 r = hashmap_ensure_allocated(&manager->links, NULL);
495 if (r < 0)
496 return r;
497
498 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
499 if (r < 0)
500 return r;
501
502 r = link_update_flags(link, message);
503 if (r < 0)
504 return r;
505
506 *ret = TAKE_PTR(link);
507
508 return 0;
509 }
510
511 static void link_detach_from_manager(Link *link) {
512 if (!link || !link->manager)
513 return;
514
515 hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex));
516 set_remove(link->manager->links_requesting_uuid, link);
517 link_clean(link);
518
519 link->manager = NULL;
520 }
521
522 static Link *link_free(Link *link) {
523 Address *address;
524 Link *carrier;
525 Route *route;
526 Iterator i;
527
528 assert(link);
529
530 while ((route = set_first(link->routes)))
531 route_free(route);
532
533 while ((route = set_first(link->routes_foreign)))
534 route_free(route);
535
536 link->routes = set_free(link->routes);
537 link->routes_foreign = set_free(link->routes_foreign);
538
539 while ((address = set_first(link->addresses)))
540 address_free(address);
541
542 while ((address = set_first(link->addresses_foreign)))
543 address_free(address);
544
545 link->addresses = set_free(link->addresses);
546 link->addresses_foreign = set_free(link->addresses_foreign);
547
548 while ((address = link->pool_addresses)) {
549 LIST_REMOVE(addresses, link->pool_addresses, address);
550 address_free(address);
551 }
552
553 sd_dhcp_server_unref(link->dhcp_server);
554 sd_dhcp_client_unref(link->dhcp_client);
555 sd_dhcp_lease_unref(link->dhcp_lease);
556
557 link_lldp_emit_stop(link);
558
559 free(link->lease_file);
560
561 sd_lldp_unref(link->lldp);
562 free(link->lldp_file);
563
564 ndisc_flush(link);
565
566 sd_ipv4ll_unref(link->ipv4ll);
567 sd_dhcp6_client_unref(link->dhcp6_client);
568 sd_ndisc_unref(link->ndisc);
569 sd_radv_unref(link->radv);
570
571 link_detach_from_manager(link);
572
573 free(link->ifname);
574
575 free(link->kind);
576
577 (void) unlink(link->state_file);
578 free(link->state_file);
579
580 sd_device_unref(link->sd_device);
581
582 HASHMAP_FOREACH (carrier, link->bound_to_links, i)
583 hashmap_remove(link->bound_to_links, INT_TO_PTR(carrier->ifindex));
584 hashmap_free(link->bound_to_links);
585
586 HASHMAP_FOREACH (carrier, link->bound_by_links, i)
587 hashmap_remove(link->bound_by_links, INT_TO_PTR(carrier->ifindex));
588 hashmap_free(link->bound_by_links);
589
590 return mfree(link);
591 }
592
593 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
594
595 void link_netlink_destroy_callback(void *userdata) {
596 Link *link = userdata;
597
598 assert(userdata);
599
600 link_unref(link);
601 }
602
603 int link_get(Manager *m, int ifindex, Link **ret) {
604 Link *link;
605
606 assert(m);
607 assert(ifindex);
608 assert(ret);
609
610 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
611 if (!link)
612 return -ENODEV;
613
614 *ret = link;
615
616 return 0;
617 }
618
619 static void link_set_state(Link *link, LinkState state) {
620 assert(link);
621
622 if (link->state == state)
623 return;
624
625 link->state = state;
626
627 link_send_changed(link, "AdministrativeState", NULL);
628 }
629
630 static void link_enter_unmanaged(Link *link) {
631 assert(link);
632
633 log_link_debug(link, "Unmanaged");
634
635 link_set_state(link, LINK_STATE_UNMANAGED);
636
637 link_dirty(link);
638 }
639
640 static int link_stop_clients(Link *link) {
641 int r = 0, k;
642
643 assert(link);
644 assert(link->manager);
645 assert(link->manager->event);
646
647 if (link->dhcp_client) {
648 k = sd_dhcp_client_stop(link->dhcp_client);
649 if (k < 0)
650 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
651 }
652
653 if (link->ipv4ll) {
654 k = sd_ipv4ll_stop(link->ipv4ll);
655 if (k < 0)
656 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
657 }
658
659 if (link->dhcp6_client) {
660 k = sd_dhcp6_client_stop(link->dhcp6_client);
661 if (k < 0)
662 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
663 }
664
665 if (link->ndisc) {
666 k = sd_ndisc_stop(link->ndisc);
667 if (k < 0)
668 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
669 }
670
671 if (link->radv) {
672 k = sd_radv_stop(link->radv);
673 if (k < 0)
674 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
675 }
676
677 link_lldp_emit_stop(link);
678 return r;
679 }
680
681 void link_enter_failed(Link *link) {
682 assert(link);
683
684 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
685 return;
686
687 log_link_warning(link, "Failed");
688
689 link_set_state(link, LINK_STATE_FAILED);
690
691 link_stop_clients(link);
692
693 link_dirty(link);
694 }
695
696 static Address* link_find_dhcp_server_address(Link *link) {
697 Address *address;
698
699 assert(link);
700 assert(link->network);
701
702 /* The first statically configured address if there is any */
703 LIST_FOREACH(addresses, address, link->network->static_addresses) {
704
705 if (address->family != AF_INET)
706 continue;
707
708 if (in_addr_is_null(address->family, &address->in_addr))
709 continue;
710
711 return address;
712 }
713
714 /* If that didn't work, find a suitable address we got from the pool */
715 LIST_FOREACH(addresses, address, link->pool_addresses) {
716 if (address->family != AF_INET)
717 continue;
718
719 return address;
720 }
721
722 return NULL;
723 }
724
725 static void link_enter_configured(Link *link) {
726 assert(link);
727 assert(link->network);
728
729 if (link->state != LINK_STATE_SETTING_ROUTES)
730 return;
731
732 log_link_info(link, "Configured");
733
734 link_set_state(link, LINK_STATE_CONFIGURED);
735
736 link_dirty(link);
737 }
738
739 void link_check_ready(Link *link) {
740 Address *a;
741 Iterator i;
742
743 assert(link);
744
745 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
746 return;
747
748 if (!link->network)
749 return;
750
751 if (!link->static_routes_configured)
752 return;
753
754 if (!link->routing_policy_rules_configured)
755 return;
756
757 if (link_ipv4ll_enabled(link))
758 if (!link->ipv4ll_address ||
759 !link->ipv4ll_route)
760 return;
761
762 if (!link->network->bridge) {
763
764 if (link_ipv6ll_enabled(link))
765 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) > 0)
766 return;
767
768 if ((link_dhcp4_enabled(link) && !link_dhcp6_enabled(link) &&
769 !link->dhcp4_configured) ||
770 (link_dhcp6_enabled(link) && !link_dhcp4_enabled(link) &&
771 !link->dhcp6_configured) ||
772 (link_dhcp4_enabled(link) && link_dhcp6_enabled(link) &&
773 !link->dhcp4_configured && !link->dhcp6_configured))
774 return;
775
776 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
777 return;
778 }
779
780 SET_FOREACH(a, link->addresses, i)
781 if (!address_is_ready(a))
782 return;
783
784 if (link->state != LINK_STATE_CONFIGURED)
785 link_enter_configured(link);
786
787 return;
788 }
789
790 static int link_set_routing_policy_rule(Link *link) {
791 RoutingPolicyRule *rule, *rrule = NULL;
792 int r;
793
794 assert(link);
795 assert(link->network);
796
797 LIST_FOREACH(rules, rule, link->network->rules) {
798 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
799 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif,
800 rule->protocol, &rule->sport, &rule->dport, &rrule);
801 if (r == 0) {
802 (void) routing_policy_rule_make_local(link->manager, rrule);
803 continue;
804 }
805
806 r = routing_policy_rule_configure(rule, link, link_routing_policy_rule_handler, false);
807 if (r < 0) {
808 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
809 link_enter_failed(link);
810 return r;
811 }
812
813 link->routing_policy_rule_messages++;
814 }
815
816 routing_policy_rule_purge(link->manager, link);
817 if (link->routing_policy_rule_messages == 0) {
818 link->routing_policy_rules_configured = true;
819 link_check_ready(link);
820 } else
821 log_link_debug(link, "Setting routing policy rules");
822
823 return 0;
824 }
825
826 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
827 Link *link = userdata;
828 int r;
829
830 assert(link);
831 assert(link->route_messages > 0);
832 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
833 LINK_STATE_SETTING_ROUTES, LINK_STATE_FAILED,
834 LINK_STATE_LINGER));
835
836 link->route_messages--;
837
838 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
839 return 1;
840
841 r = sd_netlink_message_get_errno(m);
842 if (r < 0 && r != -EEXIST)
843 log_link_warning_errno(link, r, "Could not set route: %m");
844
845 if (link->route_messages == 0) {
846 log_link_debug(link, "Routes set");
847 link->static_routes_configured = true;
848 link_check_ready(link);
849 }
850
851 return 1;
852 }
853
854 static int link_enter_set_routes(Link *link) {
855 enum {
856 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
857 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
858 _PHASE_MAX
859 } phase;
860 Route *rt;
861 int r;
862
863 assert(link);
864 assert(link->network);
865 assert(link->state == LINK_STATE_SETTING_ADDRESSES);
866
867 (void) link_set_routing_policy_rule(link);
868
869 link_set_state(link, LINK_STATE_SETTING_ROUTES);
870
871 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
872 for (phase = 0; phase < _PHASE_MAX; phase++)
873 LIST_FOREACH(routes, rt, link->network->static_routes) {
874
875 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
876 continue;
877
878 r = route_configure(rt, link, route_handler);
879 if (r < 0) {
880 log_link_warning_errno(link, r, "Could not set routes: %m");
881 link_enter_failed(link);
882 return r;
883 }
884
885 link->route_messages++;
886 }
887
888 if (link->route_messages == 0) {
889 link->static_routes_configured = true;
890 link_check_ready(link);
891 } else
892 log_link_debug(link, "Setting routes");
893
894 return 0;
895 }
896
897 int link_route_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
898 Link *link = userdata;
899 int r;
900
901 assert(m);
902 assert(link);
903 assert(link->ifname);
904
905 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
906 return 1;
907
908 r = sd_netlink_message_get_errno(m);
909 if (r < 0 && r != -ESRCH)
910 log_link_warning_errno(link, r, "Could not drop route: %m");
911
912 return 1;
913 }
914
915 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
916 Link *link = userdata;
917 int r;
918
919 assert(rtnl);
920 assert(m);
921 assert(link);
922 assert(link->ifname);
923 assert(link->address_messages > 0);
924 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
925 LINK_STATE_FAILED, LINK_STATE_LINGER));
926
927 link->address_messages--;
928
929 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
930 return 1;
931
932 r = sd_netlink_message_get_errno(m);
933 if (r < 0 && r != -EEXIST)
934 log_link_warning_errno(link, r, "could not set address: %m");
935 else if (r >= 0)
936 manager_rtnl_process_address(rtnl, m, link->manager);
937
938 if (link->address_messages == 0) {
939 log_link_debug(link, "Addresses set");
940 link_enter_set_routes(link);
941 }
942
943 return 1;
944 }
945
946 static int address_label_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
947 Link *link = userdata;
948 int r;
949
950 assert(rtnl);
951 assert(m);
952 assert(link);
953 assert(link->ifname);
954 assert(link->address_label_messages > 0);
955
956 link->address_label_messages--;
957
958 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
959 return 1;
960
961 r = sd_netlink_message_get_errno(m);
962 if (r < 0 && r != -EEXIST)
963 log_link_warning_errno(link, r, "could not set address label: %m");
964 else if (r >= 0)
965 manager_rtnl_process_address(rtnl, m, link->manager);
966
967 if (link->address_label_messages == 0)
968 log_link_debug(link, "Addresses label set");
969
970 return 1;
971 }
972
973 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
974 _cleanup_free_ struct in_addr *addresses = NULL;
975 size_t n_addresses = 0, n_allocated = 0;
976 unsigned i;
977
978 log_debug("Copying DNS server information from %s", link->ifname);
979
980 if (!link->network)
981 return 0;
982
983 for (i = 0; i < link->network->n_dns; i++) {
984 struct in_addr ia;
985
986 /* Only look for IPv4 addresses */
987 if (link->network->dns[i].family != AF_INET)
988 continue;
989
990 ia = link->network->dns[i].address.in;
991
992 /* Never propagate obviously borked data */
993 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
994 continue;
995
996 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
997 return log_oom();
998
999 addresses[n_addresses++] = ia;
1000 }
1001
1002 if (link->network->dhcp_use_dns && link->dhcp_lease) {
1003 const struct in_addr *da = NULL;
1004 int n;
1005
1006 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
1007 if (n > 0) {
1008
1009 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1010 return log_oom();
1011
1012 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
1013 n_addresses += n;
1014 }
1015 }
1016
1017 if (n_addresses <= 0)
1018 return 0;
1019
1020 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
1021 }
1022
1023 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1024 _cleanup_free_ struct in_addr *addresses = NULL;
1025 size_t n_addresses = 0, n_allocated = 0;
1026 char **a;
1027
1028 if (!link->network)
1029 return 0;
1030
1031 log_debug("Copying NTP server information from %s", link->ifname);
1032
1033 STRV_FOREACH(a, link->network->ntp) {
1034 struct in_addr ia;
1035
1036 /* Only look for IPv4 addresses */
1037 if (inet_pton(AF_INET, *a, &ia) <= 0)
1038 continue;
1039
1040 /* Never propagate obviously borked data */
1041 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1042 continue;
1043
1044 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1045 return log_oom();
1046
1047 addresses[n_addresses++] = ia;
1048 }
1049
1050 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1051 const struct in_addr *da = NULL;
1052 int n;
1053
1054 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1055 if (n > 0) {
1056
1057 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1058 return log_oom();
1059
1060 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
1061 n_addresses += n;
1062 }
1063 }
1064
1065 if (n_addresses <= 0)
1066 return 0;
1067
1068 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1069 }
1070
1071 static int link_set_bridge_fdb(Link *link) {
1072 FdbEntry *fdb_entry;
1073 int r;
1074
1075 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1076 r = fdb_entry_configure(link, fdb_entry);
1077 if (r < 0)
1078 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1079 }
1080
1081 return 0;
1082 }
1083
1084 static int link_enter_set_addresses(Link *link) {
1085 AddressLabel *label;
1086 Address *ad;
1087 int r;
1088
1089 assert(link);
1090 assert(link->network);
1091 assert(link->state != _LINK_STATE_INVALID);
1092
1093 r = link_set_bridge_fdb(link);
1094 if (r < 0)
1095 return r;
1096
1097 link_set_state(link, LINK_STATE_SETTING_ADDRESSES);
1098
1099 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1100 r = address_configure(ad, link, address_handler, false);
1101 if (r < 0) {
1102 log_link_warning_errno(link, r, "Could not set addresses: %m");
1103 link_enter_failed(link);
1104 return r;
1105 }
1106
1107 link->address_messages++;
1108 }
1109
1110 LIST_FOREACH(labels, label, link->network->address_labels) {
1111 r = address_label_configure(label, link, address_label_handler, false);
1112 if (r < 0) {
1113 log_link_warning_errno(link, r, "Could not set address label: %m");
1114 link_enter_failed(link);
1115 return r;
1116 }
1117
1118 link->address_label_messages++;
1119 }
1120
1121 /* now that we can figure out a default address for the dhcp server,
1122 start it */
1123 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1124 Address *address;
1125 Link *uplink = NULL;
1126 bool acquired_uplink = false;
1127
1128 address = link_find_dhcp_server_address(link);
1129 if (!address) {
1130 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1131 link_enter_failed(link);
1132 return 0;
1133 }
1134
1135 /* use the server address' subnet as the pool */
1136 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1137 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1138 if (r < 0)
1139 return r;
1140
1141 /* TODO:
1142 r = sd_dhcp_server_set_router(link->dhcp_server,
1143 &main_address->in_addr.in);
1144 if (r < 0)
1145 return r;
1146 */
1147
1148 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1149 r = sd_dhcp_server_set_max_lease_time(
1150 link->dhcp_server,
1151 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1152 if (r < 0)
1153 return r;
1154 }
1155
1156 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1157 r = sd_dhcp_server_set_default_lease_time(
1158 link->dhcp_server,
1159 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1160 if (r < 0)
1161 return r;
1162 }
1163
1164 if (link->network->dhcp_server_emit_dns) {
1165
1166 if (link->network->n_dhcp_server_dns > 0)
1167 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1168 else {
1169 uplink = manager_find_uplink(link->manager, link);
1170 acquired_uplink = true;
1171
1172 if (!uplink) {
1173 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1174 r = 0;
1175 } else
1176 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1177 }
1178 if (r < 0)
1179 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1180 }
1181
1182 if (link->network->dhcp_server_emit_ntp) {
1183
1184 if (link->network->n_dhcp_server_ntp > 0)
1185 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1186 else {
1187 if (!acquired_uplink)
1188 uplink = manager_find_uplink(link->manager, link);
1189
1190 if (!uplink) {
1191 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1192 r = 0;
1193 } else
1194 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1195
1196 }
1197 if (r < 0)
1198 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1199 }
1200
1201 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1202 if (r < 0)
1203 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1204
1205 if (link->network->dhcp_server_emit_timezone) {
1206 _cleanup_free_ char *buffer = NULL;
1207 const char *tz = NULL;
1208
1209 if (link->network->dhcp_server_timezone)
1210 tz = link->network->dhcp_server_timezone;
1211 else {
1212 r = get_timezone(&buffer);
1213 if (r < 0)
1214 log_warning_errno(r, "Failed to determine timezone: %m");
1215 else
1216 tz = buffer;
1217 }
1218
1219 if (tz) {
1220 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1221 if (r < 0)
1222 return r;
1223 }
1224 }
1225
1226 r = sd_dhcp_server_start(link->dhcp_server);
1227 if (r < 0) {
1228 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1229
1230 link_enter_failed(link);
1231
1232 return 0;
1233 }
1234
1235 log_link_debug(link, "Offering DHCPv4 leases");
1236 }
1237
1238 if (link->address_messages == 0)
1239 link_enter_set_routes(link);
1240 else
1241 log_link_debug(link, "Setting addresses");
1242
1243 return 0;
1244 }
1245
1246 int link_address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1247 Link *link = userdata;
1248 int r;
1249
1250 assert(m);
1251 assert(link);
1252 assert(link->ifname);
1253
1254 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1255 return 1;
1256
1257 r = sd_netlink_message_get_errno(m);
1258 if (r < 0 && r != -EADDRNOTAVAIL)
1259 log_link_warning_errno(link, r, "Could not drop address: %m");
1260
1261 return 1;
1262 }
1263
1264 static int link_set_bridge_vlan(Link *link) {
1265 int r = 0;
1266
1267 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1268 if (r < 0)
1269 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1270
1271 return r;
1272 }
1273
1274 static int link_set_proxy_arp(Link *link) {
1275 const char *p = NULL;
1276 int r;
1277
1278 if (!link_proxy_arp_enabled(link))
1279 return 0;
1280
1281 p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/proxy_arp");
1282
1283 r = write_string_file(p, one_zero(link->network->proxy_arp), WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
1284 if (r < 0)
1285 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1286
1287 return 0;
1288 }
1289
1290 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1291 Link *link = userdata;
1292 int r;
1293
1294 assert(link);
1295
1296 log_link_debug(link, "Set link");
1297
1298 r = sd_netlink_message_get_errno(m);
1299 if (r < 0 && r != -EEXIST) {
1300 log_link_error_errno(link, r, "Could not join netdev: %m");
1301 link_enter_failed(link);
1302 }
1303
1304 return 1;
1305 }
1306
1307 static int link_configure_after_setting_mtu(Link *link);
1308
1309 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1310 Link *link = userdata;
1311 int r;
1312
1313 assert(m);
1314 assert(link);
1315 assert(link->ifname);
1316
1317 link->setting_mtu = false;
1318
1319 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1320 return 1;
1321
1322 r = sd_netlink_message_get_errno(m);
1323 if (r < 0) {
1324 log_link_warning_errno(link, r, "Could not set MTU: %m");
1325 return 1;
1326 }
1327
1328 log_link_debug(link, "Setting MTU done.");
1329
1330 if (link->state == LINK_STATE_PENDING)
1331 (void) link_configure_after_setting_mtu(link);
1332
1333 return 1;
1334 }
1335
1336 int link_set_mtu(Link *link, uint32_t mtu) {
1337 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1338 int r;
1339
1340 assert(link);
1341 assert(link->manager);
1342 assert(link->manager->rtnl);
1343
1344 if (link->mtu == mtu || link->setting_mtu)
1345 return 0;
1346
1347 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1348
1349 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1350 if (r < 0)
1351 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1352
1353 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1354 * for this interface, or if it is a bridge slave, then disable IPv6 else enable it. */
1355 (void) link_enable_ipv6(link);
1356
1357 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1358 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1359 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1360
1361 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1362 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1363
1364 mtu = IPV6_MIN_MTU;
1365 }
1366
1367 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1368 if (r < 0)
1369 return log_link_error_errno(link, r, "Could not append MTU: %m");
1370
1371 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1372 link_netlink_destroy_callback, link, 0, __func__);
1373 if (r < 0)
1374 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1375
1376 link_ref(link);
1377 link->setting_mtu = true;
1378
1379 return 0;
1380 }
1381
1382 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1383 Link *link = userdata;
1384 int r;
1385
1386 assert(m);
1387 assert(link);
1388 assert(link->ifname);
1389
1390 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1391 return 1;
1392
1393 r = sd_netlink_message_get_errno(m);
1394 if (r < 0)
1395 log_link_warning_errno(link, r, "Could not set link flags: %m");
1396
1397 return 1;
1398 }
1399
1400 static int link_set_flags(Link *link) {
1401 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1402 unsigned ifi_change = 0;
1403 unsigned ifi_flags = 0;
1404 int r;
1405
1406 assert(link);
1407 assert(link->manager);
1408 assert(link->manager->rtnl);
1409
1410 if (link->flags & IFF_LOOPBACK)
1411 return 0;
1412
1413 if (!link->network)
1414 return 0;
1415
1416 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1417 return 0;
1418
1419 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1420 if (r < 0)
1421 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1422
1423 if (link->network->arp >= 0) {
1424 ifi_change |= IFF_NOARP;
1425 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1426 }
1427
1428 if (link->network->multicast >= 0) {
1429 ifi_change |= IFF_MULTICAST;
1430 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1431 }
1432
1433 if (link->network->allmulticast >= 0) {
1434 ifi_change |= IFF_ALLMULTI;
1435 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1436 }
1437
1438 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1439 if (r < 0)
1440 return log_link_error_errno(link, r, "Could not set link flags: %m");
1441
1442 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1443 link_netlink_destroy_callback, link, 0, __func__);
1444 if (r < 0)
1445 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1446
1447 link_ref(link);
1448
1449 return 0;
1450 }
1451
1452 static int link_set_bridge(Link *link) {
1453 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1454 int r;
1455
1456 assert(link);
1457 assert(link->network);
1458
1459 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1460 if (r < 0)
1461 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1462
1463 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1464 if (r < 0)
1465 return log_link_error_errno(link, r, "Could not set message family: %m");
1466
1467 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1468 if (r < 0)
1469 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1470
1471 if (link->network->use_bpdu >= 0) {
1472 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
1473 if (r < 0)
1474 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1475 }
1476
1477 if (link->network->hairpin >= 0) {
1478 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1479 if (r < 0)
1480 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1481 }
1482
1483 if (link->network->fast_leave >= 0) {
1484 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1485 if (r < 0)
1486 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1487 }
1488
1489 if (link->network->allow_port_to_be_root >= 0) {
1490 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
1491 if (r < 0)
1492 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1493
1494 }
1495
1496 if (link->network->unicast_flood >= 0) {
1497 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1498 if (r < 0)
1499 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1500
1501 }
1502
1503 if (link->network->cost != 0) {
1504 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1505 if (r < 0)
1506 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1507 }
1508 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1509 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1510 if (r < 0)
1511 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1512 }
1513
1514 r = sd_netlink_message_close_container(req);
1515 if (r < 0)
1516 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1517
1518 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, link_set_handler,
1519 link_netlink_destroy_callback, link, 0, __func__);
1520 if (r < 0)
1521 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1522
1523 link_ref(link);
1524
1525 return r;
1526 }
1527
1528 static int link_bond_set(Link *link) {
1529 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1530 int r;
1531
1532 assert(link);
1533 assert(link->network);
1534
1535 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1536 if (r < 0)
1537 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1538
1539 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1540 if (r < 0)
1541 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1542
1543 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1544 if (r < 0)
1545 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1546
1547 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1548 if (r < 0)
1549 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1550
1551 if (link->network->active_slave) {
1552 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1553 if (r < 0)
1554 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1555 }
1556
1557 if (link->network->primary_slave) {
1558 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1559 if (r < 0)
1560 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1561 }
1562
1563 r = sd_netlink_message_close_container(req);
1564 if (r < 0)
1565 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1566
1567 r = sd_netlink_message_close_container(req);
1568 if (r < 0)
1569 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1570
1571 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1572 link_netlink_destroy_callback, link, 0, __func__);
1573 if (r < 0)
1574 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1575
1576 link_ref(link);
1577
1578 return r;
1579 }
1580
1581 static int link_lldp_save(Link *link) {
1582 _cleanup_free_ char *temp_path = NULL;
1583 _cleanup_fclose_ FILE *f = NULL;
1584 sd_lldp_neighbor **l = NULL;
1585 int n = 0, r, i;
1586
1587 assert(link);
1588 assert(link->lldp_file);
1589
1590 if (!link->lldp) {
1591 (void) unlink(link->lldp_file);
1592 return 0;
1593 }
1594
1595 r = sd_lldp_get_neighbors(link->lldp, &l);
1596 if (r < 0)
1597 goto finish;
1598 if (r == 0) {
1599 (void) unlink(link->lldp_file);
1600 goto finish;
1601 }
1602
1603 n = r;
1604
1605 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1606 if (r < 0)
1607 goto finish;
1608
1609 fchmod(fileno(f), 0644);
1610
1611 for (i = 0; i < n; i++) {
1612 const void *p;
1613 le64_t u;
1614 size_t sz;
1615
1616 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1617 if (r < 0)
1618 goto finish;
1619
1620 u = htole64(sz);
1621 (void) fwrite(&u, 1, sizeof(u), f);
1622 (void) fwrite(p, 1, sz, f);
1623 }
1624
1625 r = fflush_and_check(f);
1626 if (r < 0)
1627 goto finish;
1628
1629 if (rename(temp_path, link->lldp_file) < 0) {
1630 r = -errno;
1631 goto finish;
1632 }
1633
1634 finish:
1635 if (r < 0) {
1636 (void) unlink(link->lldp_file);
1637 if (temp_path)
1638 (void) unlink(temp_path);
1639
1640 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1641 }
1642
1643 if (l) {
1644 for (i = 0; i < n; i++)
1645 sd_lldp_neighbor_unref(l[i]);
1646 free(l);
1647 }
1648
1649 return r;
1650 }
1651
1652 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1653 Link *link = userdata;
1654 int r;
1655
1656 assert(link);
1657
1658 (void) link_lldp_save(link);
1659
1660 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1661 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1662
1663 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1664
1665 r = link_lldp_emit_start(link);
1666 if (r < 0)
1667 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1668 }
1669 }
1670
1671 static int link_acquire_ipv6_conf(Link *link) {
1672 int r;
1673
1674 assert(link);
1675
1676 if (link_ipv6_accept_ra_enabled(link)) {
1677 assert(link->ndisc);
1678
1679 log_link_debug(link, "Discovering IPv6 routers");
1680
1681 r = sd_ndisc_start(link->ndisc);
1682 if (r < 0 && r != -EBUSY)
1683 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1684 }
1685
1686 if (link_radv_enabled(link)) {
1687 assert(link->radv);
1688 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1689
1690 log_link_debug(link, "Starting IPv6 Router Advertisements");
1691
1692 r = sd_radv_start(link->radv);
1693 if (r < 0 && r != -EBUSY)
1694 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1695 }
1696
1697 (void) dhcp6_request_prefix_delegation(link);
1698
1699 return 0;
1700 }
1701
1702 static int link_acquire_ipv4_conf(Link *link) {
1703 int r;
1704
1705 assert(link);
1706 assert(link->network);
1707 assert(link->manager);
1708 assert(link->manager->event);
1709
1710 if (link_ipv4ll_enabled(link)) {
1711 assert(link->ipv4ll);
1712
1713 log_link_debug(link, "Acquiring IPv4 link-local address");
1714
1715 r = sd_ipv4ll_start(link->ipv4ll);
1716 if (r < 0)
1717 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1718 }
1719
1720 if (link_dhcp4_enabled(link)) {
1721 assert(link->dhcp_client);
1722
1723 log_link_debug(link, "Acquiring DHCPv4 lease");
1724
1725 r = sd_dhcp_client_start(link->dhcp_client);
1726 if (r < 0)
1727 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1728 }
1729
1730 return 0;
1731 }
1732
1733 static int link_acquire_conf(Link *link) {
1734 int r;
1735
1736 assert(link);
1737
1738 r = link_acquire_ipv4_conf(link);
1739 if (r < 0)
1740 return r;
1741
1742 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) == 0) {
1743 r = link_acquire_ipv6_conf(link);
1744 if (r < 0)
1745 return r;
1746 }
1747
1748 if (link_lldp_emit_enabled(link)) {
1749 r = link_lldp_emit_start(link);
1750 if (r < 0)
1751 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1752 }
1753
1754 return 0;
1755 }
1756
1757 bool link_has_carrier(Link *link) {
1758 /* see Documentation/networking/operstates.txt in the kernel sources */
1759
1760 if (link->kernel_operstate == IF_OPER_UP)
1761 return true;
1762
1763 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1764 /* operstate may not be implemented, so fall back to flags */
1765 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1766 return true;
1767
1768 return false;
1769 }
1770
1771 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1772 Link *link = userdata;
1773 int r;
1774
1775 assert(link);
1776
1777 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1778 return 1;
1779
1780 r = sd_netlink_message_get_errno(m);
1781 if (r < 0)
1782 /* we warn but don't fail the link, as it may be brought up later */
1783 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1784
1785 return 1;
1786 }
1787
1788 int link_up(Link *link) {
1789 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1790 uint8_t ipv6ll_mode;
1791 int r;
1792
1793 assert(link);
1794 assert(link->network);
1795 assert(link->manager);
1796 assert(link->manager->rtnl);
1797
1798 log_link_debug(link, "Bringing link up");
1799
1800 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1801 if (r < 0)
1802 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1803
1804 /* set it free if not enslaved with networkd */
1805 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1806 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1807 if (r < 0)
1808 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1809 }
1810
1811 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1812 if (r < 0)
1813 return log_link_error_errno(link, r, "Could not set link flags: %m");
1814
1815 if (link->network->mac) {
1816 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1817 if (r < 0)
1818 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1819 }
1820
1821 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1822 if (r < 0)
1823 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1824
1825 if (link_ipv6_enabled(link)) {
1826 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
1827 r = sd_netlink_message_open_container(req, AF_INET6);
1828 if (r < 0)
1829 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1830
1831 if (!link_ipv6ll_enabled(link))
1832 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1833 else {
1834 const char *p = NULL;
1835 _cleanup_free_ char *stable_secret = NULL;
1836
1837 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/stable_secret");
1838 r = read_one_line_file(p, &stable_secret);
1839
1840 if (r < 0)
1841 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1842 else
1843 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1844 }
1845 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1846 if (r < 0)
1847 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1848
1849 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
1850 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
1851 if (r < 0)
1852 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
1853 }
1854
1855 r = sd_netlink_message_close_container(req);
1856 if (r < 0)
1857 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1858 }
1859
1860 r = sd_netlink_message_close_container(req);
1861 if (r < 0)
1862 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1863
1864 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1865 link_netlink_destroy_callback, link, 0, __func__);
1866 if (r < 0)
1867 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1868
1869 link_ref(link);
1870
1871 return 0;
1872 }
1873
1874 static int link_up_can(Link *link) {
1875 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1876 int r;
1877
1878 assert(link);
1879
1880 log_link_debug(link, "Bringing CAN link up");
1881
1882 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1883 if (r < 0)
1884 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1885
1886 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1887 if (r < 0)
1888 return log_link_error_errno(link, r, "Could not set link flags: %m");
1889
1890 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1891 link_netlink_destroy_callback, link, 0, __func__);
1892 if (r < 0)
1893 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1894
1895 link_ref(link);
1896
1897 return 0;
1898 }
1899
1900 static int link_set_can(Link *link) {
1901 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
1902 int r;
1903
1904 assert(link);
1905 assert(link->network);
1906 assert(link->manager);
1907 assert(link->manager->rtnl);
1908
1909 log_link_debug(link, "link_set_can");
1910
1911 r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
1912 if (r < 0)
1913 return log_link_error_errno(link, r, "Failed to allocate netlink message: %m");
1914
1915 r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
1916 if (r < 0)
1917 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1918
1919 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
1920 if (r < 0)
1921 return log_link_error_errno(link, r, "Failed to open netlink container: %m");
1922
1923 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
1924 if (r < 0)
1925 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1926
1927 if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) {
1928 struct can_bittiming bt = {
1929 .bitrate = link->network->can_bitrate,
1930 .sample_point = link->network->can_sample_point,
1931 };
1932
1933 if (link->network->can_bitrate > UINT32_MAX) {
1934 log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate);
1935 return -ERANGE;
1936 }
1937
1938 log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate);
1939 if (link->network->can_sample_point > 0)
1940 log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
1941 else
1942 log_link_debug(link, "Using default sample point");
1943
1944 r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
1945 if (r < 0)
1946 return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
1947 }
1948
1949 if (link->network->can_restart_us > 0) {
1950 char time_string[FORMAT_TIMESPAN_MAX];
1951 uint64_t restart_ms;
1952
1953 if (link->network->can_restart_us == USEC_INFINITY)
1954 restart_ms = 0;
1955 else
1956 restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC);
1957
1958 format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC);
1959
1960 if (restart_ms > UINT32_MAX) {
1961 log_link_error(link, "restart timeout (%s) too big.", time_string);
1962 return -ERANGE;
1963 }
1964
1965 log_link_debug(link, "Setting restart = %s", time_string);
1966
1967 r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
1968 if (r < 0)
1969 return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
1970 }
1971
1972 r = sd_netlink_message_close_container(m);
1973 if (r < 0)
1974 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
1975
1976 r = sd_netlink_message_close_container(m);
1977 if (r < 0)
1978 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
1979
1980 r = sd_netlink_call_async(link->manager->rtnl, NULL, m, link_set_handler,
1981 link_netlink_destroy_callback, link, 0, __func__);
1982 if (r < 0)
1983 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1984
1985 link_ref(link);
1986
1987 if (!(link->flags & IFF_UP)) {
1988 r = link_up_can(link);
1989 if (r < 0) {
1990 link_enter_failed(link);
1991 return r;
1992 }
1993 }
1994
1995 log_link_debug(link, "link_set_can done");
1996
1997 return r;
1998 }
1999
2000 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
2001 Link *link = userdata;
2002 int r;
2003
2004 assert(link);
2005
2006 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2007 return 1;
2008
2009 r = sd_netlink_message_get_errno(m);
2010 if (r < 0)
2011 log_link_warning_errno(link, r, "Could not bring down interface: %m");
2012
2013 if (streq_ptr(link->kind, "can"))
2014 link_set_can(link);
2015
2016 return 1;
2017 }
2018
2019 int link_down(Link *link) {
2020 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2021 int r;
2022
2023 assert(link);
2024 assert(link->manager);
2025 assert(link->manager->rtnl);
2026
2027 log_link_debug(link, "Bringing link down");
2028
2029 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
2030 RTM_SETLINK, link->ifindex);
2031 if (r < 0)
2032 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2033
2034 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
2035 if (r < 0)
2036 return log_link_error_errno(link, r, "Could not set link flags: %m");
2037
2038 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, link_down_handler,
2039 link_netlink_destroy_callback, link, 0, __func__);
2040 if (r < 0)
2041 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2042
2043 link_ref(link);
2044
2045 return 0;
2046 }
2047
2048 static int link_handle_bound_to_list(Link *link) {
2049 Link *l;
2050 Iterator i;
2051 int r;
2052 bool required_up = false;
2053 bool link_is_up = false;
2054
2055 assert(link);
2056
2057 if (hashmap_isempty(link->bound_to_links))
2058 return 0;
2059
2060 if (link->flags & IFF_UP)
2061 link_is_up = true;
2062
2063 HASHMAP_FOREACH (l, link->bound_to_links, i)
2064 if (link_has_carrier(l)) {
2065 required_up = true;
2066 break;
2067 }
2068
2069 if (!required_up && link_is_up) {
2070 r = link_down(link);
2071 if (r < 0)
2072 return r;
2073 } else if (required_up && !link_is_up) {
2074 r = link_up(link);
2075 if (r < 0)
2076 return r;
2077 }
2078
2079 return 0;
2080 }
2081
2082 static int link_handle_bound_by_list(Link *link) {
2083 Iterator i;
2084 Link *l;
2085 int r;
2086
2087 assert(link);
2088
2089 if (hashmap_isempty(link->bound_by_links))
2090 return 0;
2091
2092 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2093 r = link_handle_bound_to_list(l);
2094 if (r < 0)
2095 return r;
2096 }
2097
2098 return 0;
2099 }
2100
2101 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2102 int r;
2103
2104 assert(link);
2105 assert(carrier);
2106
2107 if (link == carrier)
2108 return 0;
2109
2110 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2111 return 0;
2112
2113 r = hashmap_ensure_allocated(h, NULL);
2114 if (r < 0)
2115 return r;
2116
2117 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2118 if (r < 0)
2119 return r;
2120
2121 return 0;
2122 }
2123
2124 static int link_new_bound_by_list(Link *link) {
2125 Manager *m;
2126 Link *carrier;
2127 Iterator i;
2128 int r;
2129 bool list_updated = false;
2130
2131 assert(link);
2132 assert(link->manager);
2133
2134 m = link->manager;
2135
2136 HASHMAP_FOREACH(carrier, m->links, i) {
2137 if (!carrier->network)
2138 continue;
2139
2140 if (strv_isempty(carrier->network->bind_carrier))
2141 continue;
2142
2143 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2144 r = link_put_carrier(link, carrier, &link->bound_by_links);
2145 if (r < 0)
2146 return r;
2147
2148 list_updated = true;
2149 }
2150 }
2151
2152 if (list_updated)
2153 link_dirty(link);
2154
2155 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2156 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2157 if (r < 0)
2158 return r;
2159
2160 link_dirty(carrier);
2161 }
2162
2163 return 0;
2164 }
2165
2166 static int link_new_bound_to_list(Link *link) {
2167 Manager *m;
2168 Link *carrier;
2169 Iterator i;
2170 int r;
2171 bool list_updated = false;
2172
2173 assert(link);
2174 assert(link->manager);
2175
2176 if (!link->network)
2177 return 0;
2178
2179 if (strv_isempty(link->network->bind_carrier))
2180 return 0;
2181
2182 m = link->manager;
2183
2184 HASHMAP_FOREACH (carrier, m->links, i) {
2185 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2186 r = link_put_carrier(link, carrier, &link->bound_to_links);
2187 if (r < 0)
2188 return r;
2189
2190 list_updated = true;
2191 }
2192 }
2193
2194 if (list_updated)
2195 link_dirty(link);
2196
2197 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2198 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2199 if (r < 0)
2200 return r;
2201
2202 link_dirty(carrier);
2203 }
2204
2205 return 0;
2206 }
2207
2208 static int link_new_carrier_maps(Link *link) {
2209 int r;
2210
2211 r = link_new_bound_by_list(link);
2212 if (r < 0)
2213 return r;
2214
2215 r = link_handle_bound_by_list(link);
2216 if (r < 0)
2217 return r;
2218
2219 r = link_new_bound_to_list(link);
2220 if (r < 0)
2221 return r;
2222
2223 r = link_handle_bound_to_list(link);
2224 if (r < 0)
2225 return r;
2226
2227 return 0;
2228 }
2229
2230 static void link_free_bound_to_list(Link *link) {
2231 Link *bound_to;
2232 Iterator i;
2233
2234 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2235 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2236
2237 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2238 link_dirty(bound_to);
2239 }
2240
2241 return;
2242 }
2243
2244 static void link_free_bound_by_list(Link *link) {
2245 Link *bound_by;
2246 Iterator i;
2247
2248 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2249 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2250
2251 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2252 link_dirty(bound_by);
2253 link_handle_bound_to_list(bound_by);
2254 }
2255 }
2256
2257 return;
2258 }
2259
2260 static void link_free_carrier_maps(Link *link) {
2261 bool list_updated = false;
2262
2263 assert(link);
2264
2265 if (!hashmap_isempty(link->bound_to_links)) {
2266 link_free_bound_to_list(link);
2267 list_updated = true;
2268 }
2269
2270 if (!hashmap_isempty(link->bound_by_links)) {
2271 link_free_bound_by_list(link);
2272 list_updated = true;
2273 }
2274
2275 if (list_updated)
2276 link_dirty(link);
2277
2278 return;
2279 }
2280
2281 void link_drop(Link *link) {
2282 if (!link || link->state == LINK_STATE_LINGER)
2283 return;
2284
2285 link_set_state(link, LINK_STATE_LINGER);
2286
2287 link_free_carrier_maps(link);
2288
2289 log_link_debug(link, "Link removed");
2290
2291 (void) unlink(link->state_file);
2292
2293 link_detach_from_manager(link);
2294
2295 link_unref(link);
2296
2297 return;
2298 }
2299
2300 static int link_joined(Link *link) {
2301 int r;
2302
2303 assert(link);
2304 assert(link->network);
2305
2306 if (!hashmap_isempty(link->bound_to_links)) {
2307 r = link_handle_bound_to_list(link);
2308 if (r < 0)
2309 return r;
2310 } else if (!(link->flags & IFF_UP)) {
2311 r = link_up(link);
2312 if (r < 0) {
2313 link_enter_failed(link);
2314 return r;
2315 }
2316 }
2317
2318 if (link->network->bridge) {
2319 r = link_set_bridge(link);
2320 if (r < 0)
2321 log_link_error_errno(link, r, "Could not set bridge message: %m");
2322 }
2323
2324 if (link->network->bond) {
2325 r = link_bond_set(link);
2326 if (r < 0)
2327 log_link_error_errno(link, r, "Could not set bond message: %m");
2328 }
2329
2330 if (link->network->use_br_vlan &&
2331 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2332 r = link_set_bridge_vlan(link);
2333 if (r < 0)
2334 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2335 }
2336
2337 /* Skip setting up addresses until it gets carrier,
2338 or it would try to set addresses twice,
2339 which is bad for non-idempotent steps. */
2340 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2341 return 0;
2342
2343 return link_enter_set_addresses(link);
2344 }
2345
2346 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
2347 Link *link = userdata;
2348 int r;
2349
2350 assert(link);
2351 assert(link->network);
2352
2353 link->enslaving--;
2354
2355 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2356 return 1;
2357
2358 r = sd_netlink_message_get_errno(m);
2359 if (r < 0 && r != -EEXIST) {
2360 log_link_error_errno(link, r, "Could not join netdev: %m");
2361 link_enter_failed(link);
2362 return 1;
2363 } else
2364 log_link_debug(link, "Joined netdev");
2365
2366 if (link->enslaving <= 0)
2367 link_joined(link);
2368
2369 return 1;
2370 }
2371
2372 static int link_enter_join_netdev(Link *link) {
2373 NetDev *netdev;
2374 Iterator i;
2375 int r;
2376
2377 assert(link);
2378 assert(link->network);
2379 assert(link->state == LINK_STATE_PENDING);
2380
2381 link_set_state(link, LINK_STATE_ENSLAVING);
2382
2383 link_dirty(link);
2384
2385 if (!link->network->bridge &&
2386 !link->network->bond &&
2387 !link->network->vrf &&
2388 hashmap_isempty(link->network->stacked_netdevs))
2389 return link_joined(link);
2390
2391 if (link->network->bond) {
2392 if (link->network->bond->state == NETDEV_STATE_READY &&
2393 link->network->bond->ifindex == link->master_ifindex)
2394 return link_joined(link);
2395
2396 log_struct(LOG_DEBUG,
2397 LOG_LINK_INTERFACE(link),
2398 LOG_NETDEV_INTERFACE(link->network->bond),
2399 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2400
2401 r = netdev_join(link->network->bond, link, netdev_join_handler);
2402 if (r < 0) {
2403 log_struct_errno(LOG_WARNING, r,
2404 LOG_LINK_INTERFACE(link),
2405 LOG_NETDEV_INTERFACE(link->network->bond),
2406 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2407 link_enter_failed(link);
2408 return r;
2409 }
2410
2411 link->enslaving++;
2412 }
2413
2414 if (link->network->bridge) {
2415 log_struct(LOG_DEBUG,
2416 LOG_LINK_INTERFACE(link),
2417 LOG_NETDEV_INTERFACE(link->network->bridge),
2418 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2419
2420 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2421 if (r < 0) {
2422 log_struct_errno(LOG_WARNING, r,
2423 LOG_LINK_INTERFACE(link),
2424 LOG_NETDEV_INTERFACE(link->network->bridge),
2425 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2426 link_enter_failed(link);
2427 return r;
2428 }
2429
2430 link->enslaving++;
2431 }
2432
2433 if (link->network->vrf) {
2434 log_struct(LOG_DEBUG,
2435 LOG_LINK_INTERFACE(link),
2436 LOG_NETDEV_INTERFACE(link->network->vrf),
2437 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2438
2439 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2440 if (r < 0) {
2441 log_struct_errno(LOG_WARNING, r,
2442 LOG_LINK_INTERFACE(link),
2443 LOG_NETDEV_INTERFACE(link->network->vrf),
2444 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2445 link_enter_failed(link);
2446 return r;
2447 }
2448
2449 link->enslaving++;
2450 }
2451
2452 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2453
2454 if (netdev->ifindex > 0) {
2455 link_joined(link);
2456 continue;
2457 }
2458
2459 log_struct(LOG_DEBUG,
2460 LOG_LINK_INTERFACE(link),
2461 LOG_NETDEV_INTERFACE(netdev),
2462 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2463
2464 r = netdev_join(netdev, link, netdev_join_handler);
2465 if (r < 0) {
2466 log_struct_errno(LOG_WARNING, r,
2467 LOG_LINK_INTERFACE(link),
2468 LOG_NETDEV_INTERFACE(netdev),
2469 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2470 link_enter_failed(link);
2471 return r;
2472 }
2473
2474 link->enslaving++;
2475 }
2476
2477 return 0;
2478 }
2479
2480 static int link_set_ipv4_forward(Link *link) {
2481 int r;
2482
2483 if (!link_ipv4_forward_enabled(link))
2484 return 0;
2485
2486 /* We propagate the forwarding flag from one interface to the
2487 * global setting one way. This means: as long as at least one
2488 * interface was configured at any time that had IP forwarding
2489 * enabled the setting will stay on for good. We do this
2490 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2491 * somewhat in sync (see below). */
2492
2493 r = write_string_file("/proc/sys/net/ipv4/ip_forward", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2494 if (r < 0)
2495 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2496
2497 return 0;
2498 }
2499
2500 static int link_set_ipv6_forward(Link *link) {
2501 int r;
2502
2503 if (!link_ipv6_forward_enabled(link))
2504 return 0;
2505
2506 /* On Linux, the IPv6 stack does not know a per-interface
2507 * packet forwarding setting: either packet forwarding is on
2508 * for all, or off for all. We hence don't bother with a
2509 * per-interface setting, but simply propagate the interface
2510 * flag, if it is set, to the global flag, one-way. Note that
2511 * while IPv4 would allow a per-interface flag, we expose the
2512 * same behaviour there and also propagate the setting from
2513 * one to all, to keep things simple (see above). */
2514
2515 r = write_string_file("/proc/sys/net/ipv6/conf/all/forwarding", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2516 if (r < 0)
2517 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2518
2519 return 0;
2520 }
2521
2522 static int link_set_ipv6_privacy_extensions(Link *link) {
2523 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2524 IPv6PrivacyExtensions s;
2525 const char *p = NULL;
2526 int r;
2527
2528 s = link_ipv6_privacy_extensions(link);
2529 if (s < 0)
2530 return 0;
2531
2532 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/use_tempaddr");
2533 xsprintf(buf, "%u", (unsigned) link->network->ipv6_privacy_extensions);
2534
2535 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2536 if (r < 0)
2537 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2538
2539 return 0;
2540 }
2541
2542 static int link_set_ipv6_accept_ra(Link *link) {
2543 const char *p = NULL;
2544 int r;
2545
2546 /* Make this a NOP if IPv6 is not available */
2547 if (!socket_ipv6_is_supported())
2548 return 0;
2549
2550 if (link->flags & IFF_LOOPBACK)
2551 return 0;
2552
2553 if (!link->network)
2554 return 0;
2555
2556 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/accept_ra");
2557
2558 /* We handle router advertisements ourselves, tell the kernel to GTFO */
2559 r = write_string_file(p, "0", WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2560 if (r < 0)
2561 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2562
2563 return 0;
2564 }
2565
2566 static int link_set_ipv6_dad_transmits(Link *link) {
2567 char buf[DECIMAL_STR_MAX(int) + 1];
2568 const char *p = NULL;
2569 int r;
2570
2571 /* Make this a NOP if IPv6 is not available */
2572 if (!socket_ipv6_is_supported())
2573 return 0;
2574
2575 if (link->flags & IFF_LOOPBACK)
2576 return 0;
2577
2578 if (!link->network)
2579 return 0;
2580
2581 if (link->network->ipv6_dad_transmits < 0)
2582 return 0;
2583
2584 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/dad_transmits");
2585 xsprintf(buf, "%i", link->network->ipv6_dad_transmits);
2586
2587 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2588 if (r < 0)
2589 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2590
2591 return 0;
2592 }
2593
2594 static int link_set_ipv6_hop_limit(Link *link) {
2595 char buf[DECIMAL_STR_MAX(int) + 1];
2596 const char *p = NULL;
2597 int r;
2598
2599 /* Make this a NOP if IPv6 is not available */
2600 if (!socket_ipv6_is_supported())
2601 return 0;
2602
2603 if (link->flags & IFF_LOOPBACK)
2604 return 0;
2605
2606 if (!link->network)
2607 return 0;
2608
2609 if (link->network->ipv6_hop_limit < 0)
2610 return 0;
2611
2612 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/hop_limit");
2613 xsprintf(buf, "%i", link->network->ipv6_hop_limit);
2614
2615 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2616 if (r < 0)
2617 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2618
2619 return 0;
2620 }
2621
2622 static int link_set_ipv6_mtu(Link *link) {
2623 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2624 const char *p = NULL;
2625 int r;
2626
2627 /* Make this a NOP if IPv6 is not available */
2628 if (!socket_ipv6_is_supported())
2629 return 0;
2630
2631 if (link->flags & IFF_LOOPBACK)
2632 return 0;
2633
2634 if (link->network->ipv6_mtu == 0)
2635 return 0;
2636
2637 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/mtu");
2638
2639 xsprintf(buf, "%" PRIu32, link->network->ipv6_mtu);
2640
2641 r = write_string_file(p, buf, WRITE_STRING_FILE_DISABLE_BUFFER);
2642 if (r < 0)
2643 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2644
2645 return 0;
2646 }
2647
2648 static bool link_is_static_address_configured(Link *link, Address *address) {
2649 Address *net_address;
2650
2651 assert(link);
2652 assert(address);
2653
2654 if (!link->network)
2655 return false;
2656
2657 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2658 if (address_equal(net_address, address))
2659 return true;
2660
2661 return false;
2662 }
2663
2664 static bool link_is_static_route_configured(Link *link, Route *route) {
2665 Route *net_route;
2666
2667 assert(link);
2668 assert(route);
2669
2670 if (!link->network)
2671 return false;
2672
2673 LIST_FOREACH(routes, net_route, link->network->static_routes)
2674 if (route_equal(net_route, route))
2675 return true;
2676
2677 return false;
2678 }
2679
2680 static int link_drop_foreign_config(Link *link) {
2681 Address *address;
2682 Route *route;
2683 Iterator i;
2684 int r;
2685
2686 SET_FOREACH(address, link->addresses_foreign, i) {
2687 /* we consider IPv6LL addresses to be managed by the kernel */
2688 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2689 continue;
2690
2691 if (link_is_static_address_configured(link, address)) {
2692 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2693 if (r < 0)
2694 return log_link_error_errno(link, r, "Failed to add address: %m");
2695 } else {
2696 r = address_remove(address, link, link_address_remove_handler);
2697 if (r < 0)
2698 return r;
2699 }
2700 }
2701
2702 SET_FOREACH(route, link->routes_foreign, i) {
2703 /* do not touch routes managed by the kernel */
2704 if (route->protocol == RTPROT_KERNEL)
2705 continue;
2706
2707 if (link_is_static_route_configured(link, route)) {
2708 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2709 if (r < 0)
2710 return r;
2711 } else {
2712 r = route_remove(route, link, link_route_remove_handler);
2713 if (r < 0)
2714 return r;
2715 }
2716 }
2717
2718 return 0;
2719 }
2720
2721 static int link_drop_config(Link *link) {
2722 Address *address, *pool_address;
2723 Route *route;
2724 Iterator i;
2725 int r;
2726
2727 SET_FOREACH(address, link->addresses, i) {
2728 /* we consider IPv6LL addresses to be managed by the kernel */
2729 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2730 continue;
2731
2732 r = address_remove(address, link, link_address_remove_handler);
2733 if (r < 0)
2734 return r;
2735
2736 /* If this address came from an address pool, clean up the pool */
2737 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2738 if (address_equal(address, pool_address)) {
2739 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2740 address_free(pool_address);
2741 break;
2742 }
2743 }
2744 }
2745
2746 SET_FOREACH(route, link->routes, i) {
2747 /* do not touch routes managed by the kernel */
2748 if (route->protocol == RTPROT_KERNEL)
2749 continue;
2750
2751 r = route_remove(route, link, link_route_remove_handler);
2752 if (r < 0)
2753 return r;
2754 }
2755
2756 ndisc_flush(link);
2757
2758 return 0;
2759 }
2760
2761 static int link_update_lldp(Link *link) {
2762 int r;
2763
2764 assert(link);
2765
2766 if (!link->lldp)
2767 return 0;
2768
2769 if (link->flags & IFF_UP) {
2770 r = sd_lldp_start(link->lldp);
2771 if (r > 0)
2772 log_link_debug(link, "Started LLDP.");
2773 } else {
2774 r = sd_lldp_stop(link->lldp);
2775 if (r > 0)
2776 log_link_debug(link, "Stopped LLDP.");
2777 }
2778
2779 return r;
2780 }
2781
2782 static int link_configure_can(Link *link) {
2783 int r;
2784
2785 if (streq_ptr(link->kind, "can")) {
2786 /* The CAN interface must be down to configure bitrate, etc... */
2787 if ((link->flags & IFF_UP)) {
2788 r = link_down(link);
2789 if (r < 0) {
2790 link_enter_failed(link);
2791 return r;
2792 }
2793
2794 return 0;
2795 }
2796
2797 return link_set_can(link);
2798 }
2799
2800 if (!(link->flags & IFF_UP)) {
2801 r = link_up_can(link);
2802 if (r < 0) {
2803 link_enter_failed(link);
2804 return r;
2805 }
2806 }
2807
2808 return 0;
2809 }
2810
2811 static int link_configure(Link *link) {
2812 int r;
2813
2814 assert(link);
2815 assert(link->network);
2816 assert(link->state == LINK_STATE_PENDING);
2817
2818 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
2819 return link_configure_can(link);
2820
2821 /* Drop foreign config, but ignore loopback or critical devices.
2822 * We do not want to remove loopback address or addresses used for root NFS. */
2823 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2824 r = link_drop_foreign_config(link);
2825 if (r < 0)
2826 return r;
2827 }
2828
2829 r = link_set_proxy_arp(link);
2830 if (r < 0)
2831 return r;
2832
2833 r = ipv6_proxy_ndp_addresses_configure(link);
2834 if (r < 0)
2835 return r;
2836
2837 r = link_set_ipv4_forward(link);
2838 if (r < 0)
2839 return r;
2840
2841 r = link_set_ipv6_forward(link);
2842 if (r < 0)
2843 return r;
2844
2845 r = link_set_ipv6_privacy_extensions(link);
2846 if (r < 0)
2847 return r;
2848
2849 r = link_set_ipv6_accept_ra(link);
2850 if (r < 0)
2851 return r;
2852
2853 r = link_set_ipv6_dad_transmits(link);
2854 if (r < 0)
2855 return r;
2856
2857 r = link_set_ipv6_hop_limit(link);
2858 if (r < 0)
2859 return r;
2860
2861 r = link_set_flags(link);
2862 if (r < 0)
2863 return r;
2864
2865 r = link_set_ipv6_mtu(link);
2866 if (r < 0)
2867 return r;
2868
2869 if (link_ipv4ll_enabled(link)) {
2870 r = ipv4ll_configure(link);
2871 if (r < 0)
2872 return r;
2873 }
2874
2875 if (link_dhcp4_enabled(link)) {
2876 r = dhcp4_set_promote_secondaries(link);
2877 if (r < 0)
2878 return r;
2879
2880 r = dhcp4_configure(link);
2881 if (r < 0)
2882 return r;
2883 }
2884
2885 if (link_dhcp4_server_enabled(link)) {
2886 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2887 if (r < 0)
2888 return r;
2889
2890 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2891 if (r < 0)
2892 return r;
2893 }
2894
2895 if (link_dhcp6_enabled(link) ||
2896 link_ipv6_accept_ra_enabled(link)) {
2897 r = dhcp6_configure(link);
2898 if (r < 0)
2899 return r;
2900 }
2901
2902 if (link_ipv6_accept_ra_enabled(link)) {
2903 r = ndisc_configure(link);
2904 if (r < 0)
2905 return r;
2906 }
2907
2908 if (link_radv_enabled(link)) {
2909 r = radv_configure(link);
2910 if (r < 0)
2911 return r;
2912 }
2913
2914 if (link_lldp_rx_enabled(link)) {
2915 r = sd_lldp_new(&link->lldp);
2916 if (r < 0)
2917 return r;
2918
2919 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
2920 if (r < 0)
2921 return r;
2922
2923 r = sd_lldp_match_capabilities(link->lldp,
2924 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
2925 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
2926 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
2927 if (r < 0)
2928 return r;
2929
2930 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
2931 if (r < 0)
2932 return r;
2933
2934 r = sd_lldp_attach_event(link->lldp, NULL, 0);
2935 if (r < 0)
2936 return r;
2937
2938 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
2939 if (r < 0)
2940 return r;
2941
2942 r = link_update_lldp(link);
2943 if (r < 0)
2944 return r;
2945 }
2946
2947 if (link->network->mtu > 0) {
2948 r = link_set_mtu(link, link->network->mtu);
2949 if (r < 0)
2950 return r;
2951 }
2952
2953 return link_configure_after_setting_mtu(link);
2954 }
2955
2956 static int link_configure_after_setting_mtu(Link *link) {
2957 int r;
2958
2959 assert(link);
2960 assert(link->network);
2961 assert(link->state == LINK_STATE_PENDING);
2962
2963 if (link->setting_mtu)
2964 return 0;
2965
2966 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2967 r = link_acquire_conf(link);
2968 if (r < 0)
2969 return r;
2970 }
2971
2972 return link_enter_join_netdev(link);
2973 }
2974
2975 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
2976 assert(duid);
2977
2978 if (duid->raw_data_len > 0)
2979 return 0;
2980
2981 if (duid->type != DUID_TYPE_UUID)
2982 return -EINVAL;
2983
2984 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
2985 duid->raw_data_len = sizeof(sd_id128_t);
2986
2987 return 1;
2988 }
2989
2990 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
2991 Manager *manager = userdata;
2992 const sd_bus_error *e;
2993 const void *a;
2994 size_t sz;
2995 DUID *duid;
2996 Link *link;
2997 int r;
2998
2999 assert(m);
3000 assert(manager);
3001
3002 e = sd_bus_message_get_error(m);
3003 if (e) {
3004 log_error_errno(sd_bus_error_get_errno(e),
3005 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3006 e->message);
3007 goto configure;
3008 }
3009
3010 r = sd_bus_message_read_array(m, 'y', &a, &sz);
3011 if (r < 0)
3012 goto configure;
3013
3014 if (sz != sizeof(sd_id128_t)) {
3015 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3016 goto configure;
3017 }
3018
3019 memcpy(&manager->product_uuid, a, sz);
3020 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3021 (void) duid_set_uuid(duid, manager->product_uuid);
3022
3023 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3024
3025 configure:
3026 while ((link = set_steal_first(manager->links_requesting_uuid))) {
3027 r = link_configure(link);
3028 if (r < 0)
3029 log_link_error_errno(link, r, "Failed to configure link: %m");
3030 }
3031
3032 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3033
3034 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3035 * even if the method fails. */
3036 manager->has_product_uuid = true;
3037
3038 return 1;
3039 }
3040
3041 static bool link_requires_uuid(Link *link) {
3042 const DUID *duid;
3043
3044 assert(link);
3045 assert(link->manager);
3046 assert(link->network);
3047
3048 duid = link_get_duid(link);
3049 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3050 return false;
3051
3052 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3053 return true;
3054
3055 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3056 return true;
3057
3058 return false;
3059 }
3060
3061 static int link_configure_duid(Link *link) {
3062 Manager *m;
3063 DUID *duid;
3064 int r;
3065
3066 assert(link);
3067 assert(link->manager);
3068 assert(link->network);
3069
3070 m = link->manager;
3071 duid = link_get_duid(link);
3072
3073 if (!link_requires_uuid(link))
3074 return 1;
3075
3076 if (m->has_product_uuid) {
3077 (void) duid_set_uuid(duid, m->product_uuid);
3078 return 1;
3079 }
3080
3081 if (!m->links_requesting_uuid) {
3082 r = manager_request_product_uuid(m, link);
3083 if (r < 0) {
3084 if (r == -ENOMEM)
3085 return r;
3086
3087 log_link_warning_errno(link, r,
3088 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3089 return 1;
3090 }
3091 } else {
3092 r = set_put(m->links_requesting_uuid, link);
3093 if (r < 0)
3094 return log_oom();
3095
3096 r = set_put(m->duids_requesting_uuid, duid);
3097 if (r < 0)
3098 return log_oom();
3099 }
3100
3101 return 0;
3102 }
3103
3104 static int link_initialized_and_synced(Link *link) {
3105 Network *network;
3106 int r;
3107
3108 assert(link);
3109 assert(link->ifname);
3110 assert(link->manager);
3111
3112 if (link->state != LINK_STATE_PENDING)
3113 return 1;
3114
3115 log_link_debug(link, "Link state is up-to-date");
3116
3117 r = link_new_bound_by_list(link);
3118 if (r < 0)
3119 return r;
3120
3121 r = link_handle_bound_by_list(link);
3122 if (r < 0)
3123 return r;
3124
3125 if (!link->network) {
3126 r = network_get(link->manager, link->sd_device, link->ifname,
3127 &link->mac, &network);
3128 if (r == -ENOENT) {
3129 link_enter_unmanaged(link);
3130 return 1;
3131 } else if (r == 0 && network->unmanaged) {
3132 link_enter_unmanaged(link);
3133 return 0;
3134 } else if (r < 0)
3135 return r;
3136
3137 if (link->flags & IFF_LOOPBACK) {
3138 if (network->link_local != ADDRESS_FAMILY_NO)
3139 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3140
3141 if (network->dhcp != ADDRESS_FAMILY_NO)
3142 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3143
3144 if (network->dhcp_server)
3145 log_link_debug(link, "Ignoring DHCP server for loopback link");
3146 }
3147
3148 r = network_apply(network, link);
3149 if (r < 0)
3150 return r;
3151 }
3152
3153 r = link_new_bound_to_list(link);
3154 if (r < 0)
3155 return r;
3156
3157 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3158 * link_configure() is called later asynchronously. */
3159 r = link_configure_duid(link);
3160 if (r <= 0)
3161 return r;
3162
3163 r = link_configure(link);
3164 if (r < 0)
3165 return r;
3166
3167 return 1;
3168 }
3169
3170 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
3171 (void) link_initialized_and_synced(userdata);
3172 return 1;
3173 }
3174
3175 int link_initialized(Link *link, sd_device *device) {
3176 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3177 int r;
3178
3179 assert(link);
3180 assert(link->manager);
3181 assert(link->manager->rtnl);
3182 assert(device);
3183
3184 if (link->state != LINK_STATE_PENDING)
3185 return 0;
3186
3187 if (link->sd_device)
3188 return 0;
3189
3190 log_link_debug(link, "udev initialized link");
3191
3192 link->sd_device = sd_device_ref(device);
3193
3194 /* udev has initialized the link, but we don't know if we have yet
3195 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3196 * when it returns we know that the pending NEWLINKs have already been
3197 * processed and that we are up-to-date */
3198
3199 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3200 link->ifindex);
3201 if (r < 0)
3202 return r;
3203
3204 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3205 link_netlink_destroy_callback, link, 0, __func__);
3206 if (r < 0)
3207 return r;
3208
3209 link_ref(link);
3210
3211 return 0;
3212 }
3213
3214 static int link_load(Link *link) {
3215 _cleanup_free_ char *network_file = NULL,
3216 *addresses = NULL,
3217 *routes = NULL,
3218 *dhcp4_address = NULL,
3219 *ipv4ll_address = NULL;
3220 union in_addr_union address;
3221 union in_addr_union route_dst;
3222 const char *p;
3223 int r;
3224
3225 assert(link);
3226
3227 r = parse_env_file(NULL, link->state_file,
3228 "NETWORK_FILE", &network_file,
3229 "ADDRESSES", &addresses,
3230 "ROUTES", &routes,
3231 "DHCP4_ADDRESS", &dhcp4_address,
3232 "IPV4LL_ADDRESS", &ipv4ll_address);
3233 if (r < 0 && r != -ENOENT)
3234 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3235
3236 if (network_file) {
3237 Network *network;
3238 char *suffix;
3239
3240 /* drop suffix */
3241 suffix = strrchr(network_file, '.');
3242 if (!suffix) {
3243 log_link_debug(link, "Failed to get network name from %s", network_file);
3244 goto network_file_fail;
3245 }
3246 *suffix = '\0';
3247
3248 r = network_get_by_name(link->manager, basename(network_file), &network);
3249 if (r < 0) {
3250 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3251 goto network_file_fail;
3252 }
3253
3254 r = network_apply(network, link);
3255 if (r < 0)
3256 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3257 }
3258
3259 network_file_fail:
3260
3261 if (addresses) {
3262 p = addresses;
3263
3264 for (;;) {
3265 _cleanup_free_ char *address_str = NULL;
3266 char *prefixlen_str;
3267 int family;
3268 unsigned char prefixlen;
3269
3270 r = extract_first_word(&p, &address_str, NULL, 0);
3271 if (r < 0) {
3272 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3273 continue;
3274 }
3275 if (r == 0)
3276 break;
3277
3278 prefixlen_str = strchr(address_str, '/');
3279 if (!prefixlen_str) {
3280 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3281 continue;
3282 }
3283
3284 *prefixlen_str++ = '\0';
3285
3286 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3287 if (r != 1) {
3288 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3289 continue;
3290 }
3291
3292 r = in_addr_from_string_auto(address_str, &family, &address);
3293 if (r < 0) {
3294 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3295 continue;
3296 }
3297
3298 r = address_add(link, family, &address, prefixlen, NULL);
3299 if (r < 0)
3300 return log_link_error_errno(link, r, "Failed to add address: %m");
3301 }
3302 }
3303
3304 if (routes) {
3305 p = routes;
3306
3307 for (;;) {
3308 Route *route;
3309 _cleanup_free_ char *route_str = NULL;
3310 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3311 usec_t lifetime;
3312 char *prefixlen_str;
3313 int family;
3314 unsigned char prefixlen, tos, table;
3315 uint32_t priority;
3316
3317 r = extract_first_word(&p, &route_str, NULL, 0);
3318 if (r < 0) {
3319 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3320 continue;
3321 }
3322 if (r == 0)
3323 break;
3324
3325 prefixlen_str = strchr(route_str, '/');
3326 if (!prefixlen_str) {
3327 log_link_debug(link, "Failed to parse route %s", route_str);
3328 continue;
3329 }
3330
3331 *prefixlen_str++ = '\0';
3332
3333 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3334 if (r != 5) {
3335 log_link_debug(link,
3336 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3337 prefixlen_str);
3338 continue;
3339 }
3340
3341 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3342 if (r < 0) {
3343 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3344 continue;
3345 }
3346
3347 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3348 if (r < 0)
3349 return log_link_error_errno(link, r, "Failed to add route: %m");
3350
3351 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3352 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3353 0, route_expire_handler, route);
3354 if (r < 0)
3355 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3356 }
3357
3358 route->lifetime = lifetime;
3359 sd_event_source_unref(route->expire);
3360 route->expire = TAKE_PTR(expire);
3361 }
3362 }
3363
3364 if (dhcp4_address) {
3365 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3366 if (r < 0) {
3367 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3368 goto dhcp4_address_fail;
3369 }
3370
3371 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3372 if (r < 0)
3373 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3374
3375 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3376 if (r < 0)
3377 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3378 }
3379
3380 dhcp4_address_fail:
3381
3382 if (ipv4ll_address) {
3383 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3384 if (r < 0) {
3385 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3386 goto ipv4ll_address_fail;
3387 }
3388
3389 r = sd_ipv4ll_new(&link->ipv4ll);
3390 if (r < 0)
3391 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3392
3393 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3394 if (r < 0)
3395 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3396 }
3397
3398 ipv4ll_address_fail:
3399
3400 return 0;
3401 }
3402
3403 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3404 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3405 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3406 Link *link;
3407 int r;
3408
3409 assert(m);
3410 assert(m->rtnl);
3411 assert(message);
3412 assert(ret);
3413
3414 r = link_new(m, message, ret);
3415 if (r < 0)
3416 return r;
3417
3418 link = *ret;
3419
3420 log_link_debug(link, "Link %d added", link->ifindex);
3421
3422 r = link_load(link);
3423 if (r < 0)
3424 return r;
3425
3426 if (detect_container() <= 0) {
3427 /* not in a container, udev will be around */
3428 sprintf(ifindex_str, "n%d", link->ifindex);
3429 r = sd_device_new_from_device_id(&device, ifindex_str);
3430 if (r < 0) {
3431 log_link_warning_errno(link, r, "Could not find device: %m");
3432 goto failed;
3433 }
3434
3435 r = sd_device_get_is_initialized(device);
3436 if (r < 0) {
3437 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3438 goto failed;
3439 }
3440 if (r == 0) {
3441 /* not yet ready */
3442 log_link_debug(link, "link pending udev initialization...");
3443 return 0;
3444 }
3445
3446 r = link_initialized(link, device);
3447 if (r < 0)
3448 goto failed;
3449 } else {
3450 r = link_initialized_and_synced(link);
3451 if (r < 0)
3452 goto failed;
3453 }
3454
3455 return 0;
3456 failed:
3457 link_enter_failed(link);
3458 return r;
3459 }
3460
3461 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3462 int r;
3463
3464 assert(link);
3465
3466 log_link_info(link, "Gained IPv6LL");
3467
3468 link->ipv6ll_address = *address;
3469 link_check_ready(link);
3470
3471 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3472 r = link_acquire_ipv6_conf(link);
3473 if (r < 0) {
3474 link_enter_failed(link);
3475 return r;
3476 }
3477 }
3478
3479 return 0;
3480 }
3481
3482 static int link_carrier_gained(Link *link) {
3483 int r;
3484
3485 assert(link);
3486
3487 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3488 r = link_acquire_conf(link);
3489 if (r < 0) {
3490 link_enter_failed(link);
3491 return r;
3492 }
3493
3494 r = link_enter_set_addresses(link);
3495 if (r < 0)
3496 return r;
3497 }
3498
3499 r = link_handle_bound_by_list(link);
3500 if (r < 0)
3501 return r;
3502
3503 return 0;
3504 }
3505
3506 static int link_carrier_lost(Link *link) {
3507 int r;
3508
3509 assert(link);
3510
3511 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3512 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3513 * configuration and stop the clients as well. */
3514 if (link->setting_mtu)
3515 return 0;
3516
3517 r = link_stop_clients(link);
3518 if (r < 0) {
3519 link_enter_failed(link);
3520 return r;
3521 }
3522
3523 if (link_dhcp4_server_enabled(link))
3524 (void) sd_dhcp_server_stop(link->dhcp_server);
3525
3526 r = link_drop_config(link);
3527 if (r < 0)
3528 return r;
3529
3530 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3531 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3532 r = link_drop_foreign_config(link);
3533 if (r < 0)
3534 return r;
3535 }
3536
3537 r = link_handle_bound_by_list(link);
3538 if (r < 0)
3539 return r;
3540
3541 return 0;
3542 }
3543
3544 int link_carrier_reset(Link *link) {
3545 int r;
3546
3547 assert(link);
3548
3549 if (link_has_carrier(link)) {
3550 r = link_carrier_lost(link);
3551 if (r < 0)
3552 return r;
3553
3554 r = link_carrier_gained(link);
3555 if (r < 0)
3556 return r;
3557
3558 log_link_info(link, "Reset carrier");
3559 }
3560
3561 return 0;
3562 }
3563
3564 int link_update(Link *link, sd_netlink_message *m) {
3565 struct ether_addr mac;
3566 const char *ifname;
3567 uint32_t mtu;
3568 bool had_carrier, carrier_gained, carrier_lost;
3569 int r;
3570
3571 assert(link);
3572 assert(link->ifname);
3573 assert(m);
3574
3575 if (link->state == LINK_STATE_LINGER) {
3576 log_link_info(link, "Link readded");
3577 link_set_state(link, LINK_STATE_ENSLAVING);
3578
3579 r = link_new_carrier_maps(link);
3580 if (r < 0)
3581 return r;
3582 }
3583
3584 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3585 if (r >= 0 && !streq(ifname, link->ifname)) {
3586 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3587
3588 if (link->state == LINK_STATE_PENDING) {
3589 r = free_and_strdup(&link->ifname, ifname);
3590 if (r < 0)
3591 return r;
3592 } else {
3593 Manager *manager = link->manager;
3594
3595 link_drop(link);
3596 r = link_add(manager, m, &link);
3597 if (r < 0)
3598 return r;
3599 }
3600 }
3601
3602 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3603 if (r >= 0 && mtu > 0) {
3604 link->mtu = mtu;
3605 if (link->original_mtu == 0) {
3606 link->original_mtu = mtu;
3607 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3608 }
3609
3610 if (link->dhcp_client) {
3611 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3612 link->mtu);
3613 if (r < 0)
3614 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3615 }
3616
3617 if (link->radv) {
3618 r = sd_radv_set_mtu(link->radv, link->mtu);
3619 if (r < 0)
3620 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3621 }
3622 }
3623
3624 /* The kernel may broadcast NEWLINK messages without the MAC address
3625 set, simply ignore them. */
3626 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3627 if (r >= 0) {
3628 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3629 ETH_ALEN)) {
3630
3631 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3632 ETH_ALEN);
3633
3634 log_link_debug(link, "MAC address: "
3635 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3636 mac.ether_addr_octet[0],
3637 mac.ether_addr_octet[1],
3638 mac.ether_addr_octet[2],
3639 mac.ether_addr_octet[3],
3640 mac.ether_addr_octet[4],
3641 mac.ether_addr_octet[5]);
3642
3643 if (link->ipv4ll) {
3644 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3645 if (r < 0)
3646 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3647 }
3648
3649 if (link->dhcp_client) {
3650 r = sd_dhcp_client_set_mac(link->dhcp_client,
3651 (const uint8_t *) &link->mac,
3652 sizeof (link->mac),
3653 ARPHRD_ETHER);
3654 if (r < 0)
3655 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3656
3657 r = dhcp4_set_client_identifier(link);
3658 if (r < 0)
3659 return r;
3660 }
3661
3662 if (link->dhcp6_client) {
3663 const DUID* duid = link_get_duid(link);
3664
3665 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3666 (const uint8_t *) &link->mac,
3667 sizeof (link->mac),
3668 ARPHRD_ETHER);
3669 if (r < 0)
3670 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3671
3672 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3673 link->network->iaid);
3674 if (r < 0)
3675 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3676
3677 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3678 duid->type,
3679 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3680 duid->raw_data_len);
3681 if (r < 0)
3682 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3683 }
3684
3685 if (link->radv) {
3686 r = sd_radv_set_mac(link->radv, &link->mac);
3687 if (r < 0)
3688 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3689 }
3690
3691 if (link->ndisc) {
3692 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3693 if (r < 0)
3694 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3695 }
3696 }
3697 }
3698
3699 had_carrier = link_has_carrier(link);
3700
3701 r = link_update_flags(link, m);
3702 if (r < 0)
3703 return r;
3704
3705 r = link_update_lldp(link);
3706 if (r < 0)
3707 return r;
3708
3709 carrier_gained = !had_carrier && link_has_carrier(link);
3710 carrier_lost = had_carrier && !link_has_carrier(link);
3711
3712 if (carrier_gained) {
3713 log_link_info(link, "Gained carrier");
3714
3715 r = link_carrier_gained(link);
3716 if (r < 0)
3717 return r;
3718 } else if (carrier_lost) {
3719 log_link_info(link, "Lost carrier");
3720
3721 r = link_carrier_lost(link);
3722 if (r < 0)
3723 return r;
3724 }
3725
3726 return 0;
3727 }
3728
3729 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3730 bool space = false;
3731 Iterator i;
3732 Link *link;
3733
3734 assert(f);
3735 assert(prefix);
3736
3737 if (hashmap_isempty(h))
3738 return;
3739
3740 fputs(prefix, f);
3741 HASHMAP_FOREACH(link, h, i) {
3742 if (space)
3743 fputc(' ', f);
3744
3745 fprintf(f, "%i", link->ifindex);
3746 space = true;
3747 }
3748
3749 fputc('\n', f);
3750 }
3751
3752 int link_save(Link *link) {
3753 _cleanup_free_ char *temp_path = NULL;
3754 _cleanup_fclose_ FILE *f = NULL;
3755 const char *admin_state, *oper_state;
3756 Address *a;
3757 Route *route;
3758 Iterator i;
3759 int r;
3760
3761 assert(link);
3762 assert(link->state_file);
3763 assert(link->lease_file);
3764 assert(link->manager);
3765
3766 if (link->state == LINK_STATE_LINGER) {
3767 unlink(link->state_file);
3768 return 0;
3769 }
3770
3771 link_lldp_save(link);
3772
3773 admin_state = link_state_to_string(link->state);
3774 assert(admin_state);
3775
3776 oper_state = link_operstate_to_string(link->operstate);
3777 assert(oper_state);
3778
3779 r = fopen_temporary(link->state_file, &f, &temp_path);
3780 if (r < 0)
3781 goto fail;
3782
3783 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
3784 (void) fchmod(fileno(f), 0644);
3785
3786 fprintf(f,
3787 "# This is private data. Do not parse.\n"
3788 "ADMIN_STATE=%s\n"
3789 "OPER_STATE=%s\n",
3790 admin_state, oper_state);
3791
3792 if (link->network) {
3793 bool space;
3794 sd_dhcp6_lease *dhcp6_lease = NULL;
3795 const char *dhcp_domainname = NULL;
3796 char **dhcp6_domains = NULL;
3797 char **dhcp_domains = NULL;
3798 unsigned j;
3799
3800 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3801 yes_no(link->network->required_for_online));
3802
3803 if (link->dhcp6_client) {
3804 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3805 if (r < 0 && r != -ENOMSG)
3806 log_link_debug(link, "No DHCPv6 lease");
3807 }
3808
3809 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3810
3811 fputs("DNS=", f);
3812 space = false;
3813
3814 for (j = 0; j < link->network->n_dns; j++) {
3815 _cleanup_free_ char *b = NULL;
3816
3817 r = in_addr_to_string(link->network->dns[j].family,
3818 &link->network->dns[j].address, &b);
3819 if (r < 0) {
3820 log_debug_errno(r, "Failed to format address, ignoring: %m");
3821 continue;
3822 }
3823
3824 if (space)
3825 fputc(' ', f);
3826 fputs(b, f);
3827 space = true;
3828 }
3829
3830 if (link->network->dhcp_use_dns &&
3831 link->dhcp_lease) {
3832 const struct in_addr *addresses;
3833
3834 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3835 if (r > 0) {
3836 if (space)
3837 fputc(' ', f);
3838 serialize_in_addrs(f, addresses, r);
3839 space = true;
3840 }
3841 }
3842
3843 if (link->network->dhcp_use_dns && dhcp6_lease) {
3844 struct in6_addr *in6_addrs;
3845
3846 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3847 if (r > 0) {
3848 if (space)
3849 fputc(' ', f);
3850 serialize_in6_addrs(f, in6_addrs, r);
3851 space = true;
3852 }
3853 }
3854
3855 /* Make sure to flush out old entries before we use the NDISC data */
3856 ndisc_vacuum(link);
3857
3858 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3859 NDiscRDNSS *dd;
3860
3861 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3862 if (space)
3863 fputc(' ', f);
3864
3865 serialize_in6_addrs(f, &dd->address, 1);
3866 space = true;
3867 }
3868 }
3869
3870 fputc('\n', f);
3871
3872 fputs("NTP=", f);
3873 space = false;
3874 fputstrv(f, link->network->ntp, NULL, &space);
3875
3876 if (link->network->dhcp_use_ntp &&
3877 link->dhcp_lease) {
3878 const struct in_addr *addresses;
3879
3880 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3881 if (r > 0) {
3882 if (space)
3883 fputc(' ', f);
3884 serialize_in_addrs(f, addresses, r);
3885 space = true;
3886 }
3887 }
3888
3889 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3890 struct in6_addr *in6_addrs;
3891 char **hosts;
3892
3893 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3894 &in6_addrs);
3895 if (r > 0) {
3896 if (space)
3897 fputc(' ', f);
3898 serialize_in6_addrs(f, in6_addrs, r);
3899 space = true;
3900 }
3901
3902 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3903 if (r > 0)
3904 fputstrv(f, hosts, NULL, &space);
3905 }
3906
3907 fputc('\n', f);
3908
3909 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3910 if (link->dhcp_lease) {
3911 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3912 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3913 }
3914 if (dhcp6_lease)
3915 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3916 }
3917
3918 fputs("DOMAINS=", f);
3919 space = false;
3920 fputstrv(f, link->network->search_domains, NULL, &space);
3921
3922 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3923 NDiscDNSSL *dd;
3924
3925 if (dhcp_domainname)
3926 fputs_with_space(f, dhcp_domainname, NULL, &space);
3927 if (dhcp_domains)
3928 fputstrv(f, dhcp_domains, NULL, &space);
3929 if (dhcp6_domains)
3930 fputstrv(f, dhcp6_domains, NULL, &space);
3931
3932 SET_FOREACH(dd, link->ndisc_dnssl, i)
3933 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3934 }
3935
3936 fputc('\n', f);
3937
3938 fputs("ROUTE_DOMAINS=", f);
3939 space = false;
3940 fputstrv(f, link->network->route_domains, NULL, &space);
3941
3942 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3943 NDiscDNSSL *dd;
3944
3945 if (dhcp_domainname)
3946 fputs_with_space(f, dhcp_domainname, NULL, &space);
3947 if (dhcp_domains)
3948 fputstrv(f, dhcp_domains, NULL, &space);
3949 if (dhcp6_domains)
3950 fputstrv(f, dhcp6_domains, NULL, &space);
3951
3952 SET_FOREACH(dd, link->ndisc_dnssl, i)
3953 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3954 }
3955
3956 fputc('\n', f);
3957
3958 fprintf(f, "LLMNR=%s\n",
3959 resolve_support_to_string(link->network->llmnr));
3960 fprintf(f, "MDNS=%s\n",
3961 resolve_support_to_string(link->network->mdns));
3962
3963 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3964 fprintf(f, "DNS_OVER_TLS=%s\n",
3965 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
3966
3967 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3968 fprintf(f, "DNSSEC=%s\n",
3969 dnssec_mode_to_string(link->network->dnssec_mode));
3970
3971 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3972 const char *n;
3973
3974 fputs("DNSSEC_NTA=", f);
3975 space = false;
3976 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3977 fputs_with_space(f, n, NULL, &space);
3978 fputc('\n', f);
3979 }
3980
3981 fputs("ADDRESSES=", f);
3982 space = false;
3983 SET_FOREACH(a, link->addresses, i) {
3984 _cleanup_free_ char *address_str = NULL;
3985
3986 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3987 if (r < 0)
3988 goto fail;
3989
3990 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3991 space = true;
3992 }
3993 fputc('\n', f);
3994
3995 fputs("ROUTES=", f);
3996 space = false;
3997 SET_FOREACH(route, link->routes, i) {
3998 _cleanup_free_ char *route_str = NULL;
3999
4000 r = in_addr_to_string(route->family, &route->dst, &route_str);
4001 if (r < 0)
4002 goto fail;
4003
4004 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4005 space ? " " : "", route_str,
4006 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4007 space = true;
4008 }
4009
4010 fputc('\n', f);
4011 }
4012
4013 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4014 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4015
4016 if (link->dhcp_lease) {
4017 struct in_addr address;
4018 const char *tz = NULL;
4019
4020 assert(link->network);
4021
4022 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
4023 if (r >= 0)
4024 fprintf(f, "TIMEZONE=%s\n", tz);
4025
4026 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
4027 if (r >= 0) {
4028 fputs("DHCP4_ADDRESS=", f);
4029 serialize_in_addrs(f, &address, 1);
4030 fputc('\n', f);
4031 }
4032
4033 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4034 if (r < 0)
4035 goto fail;
4036
4037 fprintf(f,
4038 "DHCP_LEASE=%s\n",
4039 link->lease_file);
4040 } else
4041 unlink(link->lease_file);
4042
4043 if (link->ipv4ll) {
4044 struct in_addr address;
4045
4046 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4047 if (r >= 0) {
4048 fputs("IPV4LL_ADDRESS=", f);
4049 serialize_in_addrs(f, &address, 1);
4050 fputc('\n', f);
4051 }
4052 }
4053
4054 r = fflush_and_check(f);
4055 if (r < 0)
4056 goto fail;
4057
4058 if (rename(temp_path, link->state_file) < 0) {
4059 r = -errno;
4060 goto fail;
4061 }
4062
4063 return 0;
4064
4065 fail:
4066 (void) unlink(link->state_file);
4067 if (temp_path)
4068 (void) unlink(temp_path);
4069
4070 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4071 }
4072
4073 /* The serialized state in /run is no longer up-to-date. */
4074 void link_dirty(Link *link) {
4075 int r;
4076
4077 assert(link);
4078
4079 /* mark manager dirty as link is dirty */
4080 manager_dirty(link->manager);
4081
4082 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
4083 if (r < 0)
4084 /* allocation errors are ignored */
4085 return;
4086
4087 r = set_put(link->manager->dirty_links, link);
4088 if (r <= 0)
4089 /* don't take another ref if the link was already dirty */
4090 return;
4091
4092 link_ref(link);
4093 }
4094
4095 /* The serialized state in /run is up-to-date */
4096 void link_clean(Link *link) {
4097 assert(link);
4098 assert(link->manager);
4099
4100 link_unref(set_remove(link->manager->dirty_links, link));
4101 }
4102
4103 static const char* const link_state_table[_LINK_STATE_MAX] = {
4104 [LINK_STATE_PENDING] = "pending",
4105 [LINK_STATE_ENSLAVING] = "configuring",
4106 [LINK_STATE_SETTING_ADDRESSES] = "configuring",
4107 [LINK_STATE_SETTING_ROUTES] = "configuring",
4108 [LINK_STATE_CONFIGURED] = "configured",
4109 [LINK_STATE_UNMANAGED] = "unmanaged",
4110 [LINK_STATE_FAILED] = "failed",
4111 [LINK_STATE_LINGER] = "linger",
4112 };
4113
4114 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
4115
4116 static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
4117 [LINK_OPERSTATE_OFF] = "off",
4118 [LINK_OPERSTATE_NO_CARRIER] = "no-carrier",
4119 [LINK_OPERSTATE_DORMANT] = "dormant",
4120 [LINK_OPERSTATE_CARRIER] = "carrier",
4121 [LINK_OPERSTATE_DEGRADED] = "degraded",
4122 [LINK_OPERSTATE_ROUTABLE] = "routable",
4123 };
4124
4125 DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
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