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