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[thirdparty/systemd.git] / src / network / networkd-link.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2 /***
3 Copyright © 2013 Tom Gundersen <teg@jklm.no>
4 ***/
5
6 #include <netinet/ether.h>
7 #include <linux/if.h>
8 #include <linux/can/netlink.h>
9 #include <unistd.h>
10 #include <stdio_ext.h>
11
12 #include "alloc-util.h"
13 #include "bus-util.h"
14 #include "dhcp-lease-internal.h"
15 #include "fd-util.h"
16 #include "fileio.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 "udev-util.h"
30 #include "util.h"
31 #include "virt.h"
32
33 static bool link_dhcp6_enabled(Link *link) {
34 assert(link);
35
36 if (!socket_ipv6_is_supported())
37 return false;
38
39 if (link->flags & IFF_LOOPBACK)
40 return false;
41
42 if (!link->network)
43 return false;
44
45 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
46 }
47
48 static bool link_dhcp4_enabled(Link *link) {
49 assert(link);
50
51 if (link->flags & IFF_LOOPBACK)
52 return false;
53
54 if (!link->network)
55 return false;
56
57 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
58 }
59
60 static bool link_dhcp4_server_enabled(Link *link) {
61 assert(link);
62
63 if (link->flags & IFF_LOOPBACK)
64 return false;
65
66 if (!link->network)
67 return false;
68
69 return link->network->dhcp_server;
70 }
71
72 static bool link_ipv4ll_enabled(Link *link) {
73 assert(link);
74
75 if (link->flags & IFF_LOOPBACK)
76 return false;
77
78 if (!link->network)
79 return false;
80
81 if (streq_ptr(link->kind, "wireguard"))
82 return false;
83
84 return link->network->link_local & ADDRESS_FAMILY_IPV4;
85 }
86
87 static bool link_ipv6ll_enabled(Link *link) {
88 assert(link);
89
90 if (!socket_ipv6_is_supported())
91 return false;
92
93 if (link->flags & IFF_LOOPBACK)
94 return false;
95
96 if (!link->network)
97 return false;
98
99 if (streq_ptr(link->kind, "wireguard"))
100 return false;
101
102 return link->network->link_local & ADDRESS_FAMILY_IPV6;
103 }
104
105 static bool link_ipv6_enabled(Link *link) {
106 assert(link);
107
108 if (!socket_ipv6_is_supported())
109 return false;
110
111 if (link->network->bridge)
112 return false;
113
114 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
115 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
116 }
117
118 static bool link_radv_enabled(Link *link) {
119 assert(link);
120
121 if (!link_ipv6ll_enabled(link))
122 return false;
123
124 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
125 }
126
127 static bool link_lldp_rx_enabled(Link *link) {
128 assert(link);
129
130 if (link->flags & IFF_LOOPBACK)
131 return false;
132
133 if (link->iftype != ARPHRD_ETHER)
134 return false;
135
136 if (!link->network)
137 return false;
138
139 /* LLDP should be handled on bridge slaves as those have a direct
140 * connection to their peers not on the bridge master. Linux doesn't
141 * even (by default) forward lldp packets to the bridge master.*/
142 if (streq_ptr("bridge", link->kind))
143 return false;
144
145 return link->network->lldp_mode != LLDP_MODE_NO;
146 }
147
148 static bool link_lldp_emit_enabled(Link *link) {
149 assert(link);
150
151 if (link->flags & IFF_LOOPBACK)
152 return false;
153
154 if (link->iftype != ARPHRD_ETHER)
155 return false;
156
157 if (!link->network)
158 return false;
159
160 return link->network->lldp_emit != LLDP_EMIT_NO;
161 }
162
163 static bool link_ipv4_forward_enabled(Link *link) {
164 assert(link);
165
166 if (link->flags & IFF_LOOPBACK)
167 return false;
168
169 if (!link->network)
170 return false;
171
172 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
173 return false;
174
175 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
176 }
177
178 static bool link_ipv6_forward_enabled(Link *link) {
179 assert(link);
180
181 if (!socket_ipv6_is_supported())
182 return false;
183
184 if (link->flags & IFF_LOOPBACK)
185 return false;
186
187 if (!link->network)
188 return false;
189
190 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
191 return false;
192
193 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
194 }
195
196 static bool link_proxy_arp_enabled(Link *link) {
197 assert(link);
198
199 if (link->flags & IFF_LOOPBACK)
200 return false;
201
202 if (!link->network)
203 return false;
204
205 if (link->network->proxy_arp < 0)
206 return false;
207
208 return true;
209 }
210
211 static bool link_ipv6_accept_ra_enabled(Link *link) {
212 assert(link);
213
214 if (!socket_ipv6_is_supported())
215 return false;
216
217 if (link->flags & IFF_LOOPBACK)
218 return false;
219
220 if (!link->network)
221 return false;
222
223 if (!link_ipv6ll_enabled(link))
224 return false;
225
226 /* If unset use system default (enabled if local forwarding is disabled.
227 * disabled if local forwarding is enabled).
228 * If set, ignore or enforce RA independent of local forwarding state.
229 */
230 if (link->network->ipv6_accept_ra < 0)
231 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
232 return !link_ipv6_forward_enabled(link);
233 else if (link->network->ipv6_accept_ra > 0)
234 /* accept RA even if ip_forward is enabled */
235 return true;
236 else
237 /* ignore RA */
238 return false;
239 }
240
241 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
242 assert(link);
243
244 if (!socket_ipv6_is_supported())
245 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
246
247 if (link->flags & IFF_LOOPBACK)
248 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
249
250 if (!link->network)
251 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
252
253 return link->network->ipv6_privacy_extensions;
254 }
255
256 static int link_enable_ipv6(Link *link) {
257 const char *p = NULL;
258 bool disabled;
259 int r;
260
261 if (link->flags & IFF_LOOPBACK)
262 return 0;
263
264 disabled = !link_ipv6_enabled(link);
265
266 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/disable_ipv6");
267
268 r = write_string_file(p, one_zero(disabled), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
269 if (r < 0)
270 log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m",
271 enable_disable(!disabled), link->ifname);
272 else
273 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
274
275 return 0;
276 }
277
278 void link_update_operstate(Link *link) {
279 LinkOperationalState operstate;
280 assert(link);
281
282 if (link->kernel_operstate == IF_OPER_DORMANT)
283 operstate = LINK_OPERSTATE_DORMANT;
284 else if (link_has_carrier(link)) {
285 Address *address;
286 uint8_t scope = RT_SCOPE_NOWHERE;
287 Iterator i;
288
289 /* if we have carrier, check what addresses we have */
290 SET_FOREACH(address, link->addresses, i) {
291 if (!address_is_ready(address))
292 continue;
293
294 if (address->scope < scope)
295 scope = address->scope;
296 }
297
298 /* for operstate we also take foreign addresses into account */
299 SET_FOREACH(address, link->addresses_foreign, i) {
300 if (!address_is_ready(address))
301 continue;
302
303 if (address->scope < scope)
304 scope = address->scope;
305 }
306
307 if (scope < RT_SCOPE_SITE)
308 /* universally accessible addresses found */
309 operstate = LINK_OPERSTATE_ROUTABLE;
310 else if (scope < RT_SCOPE_HOST)
311 /* only link or site local addresses found */
312 operstate = LINK_OPERSTATE_DEGRADED;
313 else
314 /* no useful addresses found */
315 operstate = LINK_OPERSTATE_CARRIER;
316 } else if (link->flags & IFF_UP)
317 operstate = LINK_OPERSTATE_NO_CARRIER;
318 else
319 operstate = LINK_OPERSTATE_OFF;
320
321 if (link->operstate != operstate) {
322 link->operstate = operstate;
323 link_send_changed(link, "OperationalState", NULL);
324 link_dirty(link);
325 }
326 }
327
328 #define FLAG_STRING(string, flag, old, new) \
329 (((old ^ new) & flag) \
330 ? ((old & flag) ? (" -" string) : (" +" string)) \
331 : "")
332
333 static int link_update_flags(Link *link, sd_netlink_message *m) {
334 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
335 uint8_t operstate;
336 int r;
337
338 assert(link);
339
340 r = sd_rtnl_message_link_get_flags(m, &flags);
341 if (r < 0)
342 return log_link_warning_errno(link, r, "Could not get link flags: %m");
343
344 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
345 if (r < 0)
346 /* if we got a message without operstate, take it to mean
347 the state was unchanged */
348 operstate = link->kernel_operstate;
349
350 if ((link->flags == flags) && (link->kernel_operstate == operstate))
351 return 0;
352
353 if (link->flags != flags) {
354 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",
355 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
356 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
357 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
358 FLAG_STRING("UP", IFF_UP, link->flags, flags),
359 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
360 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
361 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
362 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
363 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
364 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
365 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
366 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
367 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
368 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
369 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
370 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
371 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
372 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
373 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
374
375 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
376 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
377 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
378 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
379 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
380 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
381 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
382 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
383
384 /* link flags are currently at most 18 bits, let's align to
385 * printing 20 */
386 if (unknown_flags_added)
387 log_link_debug(link,
388 "Unknown link flags gained: %#.5x (ignoring)",
389 unknown_flags_added);
390
391 if (unknown_flags_removed)
392 log_link_debug(link,
393 "Unknown link flags lost: %#.5x (ignoring)",
394 unknown_flags_removed);
395 }
396
397 link->flags = flags;
398 link->kernel_operstate = operstate;
399
400 link_update_operstate(link);
401
402 return 0;
403 }
404
405 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
406 _cleanup_(link_unrefp) Link *link = NULL;
407 uint16_t type;
408 const char *ifname, *kind = NULL;
409 int r, ifindex;
410 unsigned short iftype;
411
412 assert(manager);
413 assert(message);
414 assert(ret);
415
416 /* check for link kind */
417 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
418 if (r == 0) {
419 (void)sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
420 r = sd_netlink_message_exit_container(message);
421 if (r < 0)
422 return r;
423 }
424
425 r = sd_netlink_message_get_type(message, &type);
426 if (r < 0)
427 return r;
428 else if (type != RTM_NEWLINK)
429 return -EINVAL;
430
431 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
432 if (r < 0)
433 return r;
434 else if (ifindex <= 0)
435 return -EINVAL;
436
437 r = sd_rtnl_message_link_get_type(message, &iftype);
438 if (r < 0)
439 return r;
440
441 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
442 if (r < 0)
443 return r;
444
445 link = new0(Link, 1);
446 if (!link)
447 return -ENOMEM;
448
449 link->n_ref = 1;
450 link->manager = manager;
451 link->state = LINK_STATE_PENDING;
452 link->rtnl_extended_attrs = true;
453 link->ifindex = ifindex;
454 link->iftype = iftype;
455 link->ifname = strdup(ifname);
456 if (!link->ifname)
457 return -ENOMEM;
458
459 if (kind) {
460 link->kind = strdup(kind);
461 if (!link->kind)
462 return -ENOMEM;
463 }
464
465 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
466 if (r < 0)
467 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
468
469 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
470 return -ENOMEM;
471
472 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
473 return -ENOMEM;
474
475 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
476 return -ENOMEM;
477
478 r = hashmap_ensure_allocated(&manager->links, NULL);
479 if (r < 0)
480 return r;
481
482 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
483 if (r < 0)
484 return r;
485
486 r = link_update_flags(link, message);
487 if (r < 0)
488 return r;
489
490 *ret = TAKE_PTR(link);
491
492 return 0;
493 }
494
495 static void link_free(Link *link) {
496 Address *address;
497 Link *carrier;
498 Iterator i;
499
500 if (!link)
501 return;
502
503 while (!set_isempty(link->addresses))
504 address_free(set_first(link->addresses));
505
506 while (!set_isempty(link->addresses_foreign))
507 address_free(set_first(link->addresses_foreign));
508
509 link->addresses = set_free(link->addresses);
510
511 link->addresses_foreign = set_free(link->addresses_foreign);
512
513 while ((address = link->pool_addresses)) {
514 LIST_REMOVE(addresses, link->pool_addresses, address);
515 address_free(address);
516 }
517
518 sd_dhcp_server_unref(link->dhcp_server);
519 sd_dhcp_client_unref(link->dhcp_client);
520 sd_dhcp_lease_unref(link->dhcp_lease);
521
522 link_lldp_emit_stop(link);
523
524 free(link->lease_file);
525
526 sd_lldp_unref(link->lldp);
527 free(link->lldp_file);
528
529 ndisc_flush(link);
530
531 sd_ipv4ll_unref(link->ipv4ll);
532 sd_dhcp6_client_unref(link->dhcp6_client);
533 sd_ndisc_unref(link->ndisc);
534 sd_radv_unref(link->radv);
535
536 if (link->manager)
537 hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex));
538
539 free(link->ifname);
540
541 free(link->kind);
542
543 (void)unlink(link->state_file);
544 free(link->state_file);
545
546 udev_device_unref(link->udev_device);
547
548 HASHMAP_FOREACH (carrier, link->bound_to_links, i)
549 hashmap_remove(link->bound_to_links, INT_TO_PTR(carrier->ifindex));
550 hashmap_free(link->bound_to_links);
551
552 HASHMAP_FOREACH (carrier, link->bound_by_links, i)
553 hashmap_remove(link->bound_by_links, INT_TO_PTR(carrier->ifindex));
554 hashmap_free(link->bound_by_links);
555
556 free(link);
557 }
558
559 Link *link_unref(Link *link) {
560 if (!link)
561 return NULL;
562
563 assert(link->n_ref > 0);
564
565 link->n_ref--;
566
567 if (link->n_ref > 0)
568 return NULL;
569
570 link_free(link);
571
572 return NULL;
573 }
574
575 Link *link_ref(Link *link) {
576 if (!link)
577 return NULL;
578
579 assert(link->n_ref > 0);
580
581 link->n_ref++;
582
583 return link;
584 }
585
586 int link_get(Manager *m, int ifindex, Link **ret) {
587 Link *link;
588
589 assert(m);
590 assert(ifindex);
591 assert(ret);
592
593 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
594 if (!link)
595 return -ENODEV;
596
597 *ret = link;
598
599 return 0;
600 }
601
602 static void link_set_state(Link *link, LinkState state) {
603 assert(link);
604
605 if (link->state == state)
606 return;
607
608 link->state = state;
609
610 link_send_changed(link, "AdministrativeState", NULL);
611 }
612
613 static void link_enter_unmanaged(Link *link) {
614 assert(link);
615
616 log_link_debug(link, "Unmanaged");
617
618 link_set_state(link, LINK_STATE_UNMANAGED);
619
620 link_dirty(link);
621 }
622
623 static int link_stop_clients(Link *link) {
624 int r = 0, k;
625
626 assert(link);
627 assert(link->manager);
628 assert(link->manager->event);
629
630 if (link->dhcp_client) {
631 k = sd_dhcp_client_stop(link->dhcp_client);
632 if (k < 0)
633 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
634 }
635
636 if (link->ipv4ll) {
637 k = sd_ipv4ll_stop(link->ipv4ll);
638 if (k < 0)
639 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
640 }
641
642 if (link->dhcp6_client) {
643 k = sd_dhcp6_client_stop(link->dhcp6_client);
644 if (k < 0)
645 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
646 }
647
648 if (link->ndisc) {
649 k = sd_ndisc_stop(link->ndisc);
650 if (k < 0)
651 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
652 }
653
654 if (link->radv) {
655 k = sd_radv_stop(link->radv);
656 if (k < 0)
657 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
658 }
659
660 link_lldp_emit_stop(link);
661 return r;
662 }
663
664 void link_enter_failed(Link *link) {
665 assert(link);
666
667 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
668 return;
669
670 log_link_warning(link, "Failed");
671
672 link_set_state(link, LINK_STATE_FAILED);
673
674 link_stop_clients(link);
675
676 link_dirty(link);
677 }
678
679 static Address* link_find_dhcp_server_address(Link *link) {
680 Address *address;
681
682 assert(link);
683 assert(link->network);
684
685 /* The first statically configured address if there is any */
686 LIST_FOREACH(addresses, address, link->network->static_addresses) {
687
688 if (address->family != AF_INET)
689 continue;
690
691 if (in_addr_is_null(address->family, &address->in_addr))
692 continue;
693
694 return address;
695 }
696
697 /* If that didn't work, find a suitable address we got from the pool */
698 LIST_FOREACH(addresses, address, link->pool_addresses) {
699 if (address->family != AF_INET)
700 continue;
701
702 return address;
703 }
704
705 return NULL;
706 }
707
708 static void link_enter_configured(Link *link) {
709 assert(link);
710 assert(link->network);
711
712 if (link->state != LINK_STATE_SETTING_ROUTES)
713 return;
714
715 log_link_info(link, "Configured");
716
717 link_set_state(link, LINK_STATE_CONFIGURED);
718
719 link_dirty(link);
720 }
721
722 void link_check_ready(Link *link) {
723 Address *a;
724 Iterator i;
725
726 assert(link);
727
728 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
729 return;
730
731 if (!link->network)
732 return;
733
734 if (!link->static_routes_configured)
735 return;
736
737 if (!link->routing_policy_rules_configured)
738 return;
739
740 if (link_ipv4ll_enabled(link))
741 if (!link->ipv4ll_address ||
742 !link->ipv4ll_route)
743 return;
744
745 if (!link->network->bridge) {
746
747 if (link_ipv6ll_enabled(link))
748 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) > 0)
749 return;
750
751 if ((link_dhcp4_enabled(link) && !link_dhcp6_enabled(link) &&
752 !link->dhcp4_configured) ||
753 (link_dhcp6_enabled(link) && !link_dhcp4_enabled(link) &&
754 !link->dhcp6_configured) ||
755 (link_dhcp4_enabled(link) && link_dhcp6_enabled(link) &&
756 !link->dhcp4_configured && !link->dhcp6_configured))
757 return;
758
759 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
760 return;
761 }
762
763 SET_FOREACH(a, link->addresses, i)
764 if (!address_is_ready(a))
765 return;
766
767 if (link->state != LINK_STATE_CONFIGURED)
768 link_enter_configured(link);
769
770 return;
771 }
772
773 static int link_set_routing_policy_rule(Link *link) {
774 RoutingPolicyRule *rule, *rrule = NULL;
775 int r;
776
777 assert(link);
778 assert(link->network);
779
780 LIST_FOREACH(rules, rule, link->network->rules) {
781 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
782 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif, &rrule);
783 if (r == 1) {
784 (void) routing_policy_rule_make_local(link->manager, rrule);
785 continue;
786 }
787
788 r = routing_policy_rule_configure(rule, link, link_routing_policy_rule_handler, false);
789 if (r < 0) {
790 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
791 link_enter_failed(link);
792 return r;
793 }
794
795 link->routing_policy_rule_messages++;
796 }
797
798 routing_policy_rule_purge(link->manager, link);
799 if (link->routing_policy_rule_messages == 0) {
800 link->routing_policy_rules_configured = true;
801 link_check_ready(link);
802 } else
803 log_link_debug(link, "Setting routing policy rules");
804
805 return 0;
806 }
807
808 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
809 _cleanup_(link_unrefp) Link *link = userdata;
810 int r;
811
812 assert(link->route_messages > 0);
813 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
814 LINK_STATE_SETTING_ROUTES, LINK_STATE_FAILED,
815 LINK_STATE_LINGER));
816
817 link->route_messages--;
818
819 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
820 return 1;
821
822 r = sd_netlink_message_get_errno(m);
823 if (r < 0 && r != -EEXIST)
824 log_link_warning_errno(link, r, "Could not set route: %m");
825
826 if (link->route_messages == 0) {
827 log_link_debug(link, "Routes set");
828 link->static_routes_configured = true;
829 link_check_ready(link);
830 }
831
832 return 1;
833 }
834
835 static int link_enter_set_routes(Link *link) {
836 Route *rt;
837 int r;
838
839 assert(link);
840 assert(link->network);
841 assert(link->state == LINK_STATE_SETTING_ADDRESSES);
842
843 (void) link_set_routing_policy_rule(link);
844
845 link_set_state(link, LINK_STATE_SETTING_ROUTES);
846
847 LIST_FOREACH(routes, rt, link->network->static_routes) {
848 r = route_configure(rt, link, route_handler);
849 if (r < 0) {
850 log_link_warning_errno(link, r, "Could not set routes: %m");
851 link_enter_failed(link);
852 return r;
853 }
854
855 link->route_messages++;
856 }
857
858 if (link->route_messages == 0) {
859 link->static_routes_configured = true;
860 link_check_ready(link);
861 } else
862 log_link_debug(link, "Setting routes");
863
864 return 0;
865 }
866
867 int link_route_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
868 _cleanup_(link_unrefp) Link *link = userdata;
869 int r;
870
871 assert(m);
872 assert(link);
873 assert(link->ifname);
874
875 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
876 return 1;
877
878 r = sd_netlink_message_get_errno(m);
879 if (r < 0 && r != -ESRCH)
880 log_link_warning_errno(link, r, "Could not drop route: %m");
881
882 return 1;
883 }
884
885 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
886 _cleanup_(link_unrefp) Link *link = userdata;
887 int r;
888
889 assert(rtnl);
890 assert(m);
891 assert(link);
892 assert(link->ifname);
893 assert(link->address_messages > 0);
894 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
895 LINK_STATE_FAILED, LINK_STATE_LINGER));
896
897 link->address_messages--;
898
899 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
900 return 1;
901
902 r = sd_netlink_message_get_errno(m);
903 if (r < 0 && r != -EEXIST)
904 log_link_warning_errno(link, r, "could not set address: %m");
905 else if (r >= 0)
906 manager_rtnl_process_address(rtnl, m, link->manager);
907
908 if (link->address_messages == 0) {
909 log_link_debug(link, "Addresses set");
910 link_enter_set_routes(link);
911 }
912
913 return 1;
914 }
915
916 static int address_label_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
917 _cleanup_(link_unrefp) Link *link = userdata;
918 int r;
919
920 assert(rtnl);
921 assert(m);
922 assert(link);
923 assert(link->ifname);
924 assert(link->address_label_messages > 0);
925
926 link->address_label_messages--;
927
928 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
929 return 1;
930
931 r = sd_netlink_message_get_errno(m);
932 if (r < 0 && r != -EEXIST)
933 log_link_warning_errno(link, r, "could not set address label: %m");
934 else if (r >= 0)
935 manager_rtnl_process_address(rtnl, m, link->manager);
936
937 if (link->address_label_messages == 0)
938 log_link_debug(link, "Addresses label set");
939
940 return 1;
941 }
942
943 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
944 _cleanup_free_ struct in_addr *addresses = NULL;
945 size_t n_addresses = 0, n_allocated = 0;
946 unsigned i;
947
948 log_debug("Copying DNS server information from %s", link->ifname);
949
950 if (!link->network)
951 return 0;
952
953 for (i = 0; i < link->network->n_dns; i++) {
954 struct in_addr ia;
955
956 /* Only look for IPv4 addresses */
957 if (link->network->dns[i].family != AF_INET)
958 continue;
959
960 ia = link->network->dns[i].address.in;
961
962 /* Never propagate obviously borked data */
963 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
964 continue;
965
966 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
967 return log_oom();
968
969 addresses[n_addresses++] = ia;
970 }
971
972 if (link->network->dhcp_use_dns && link->dhcp_lease) {
973 const struct in_addr *da = NULL;
974 int n;
975
976 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
977 if (n > 0) {
978
979 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
980 return log_oom();
981
982 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
983 n_addresses += n;
984 }
985 }
986
987 if (n_addresses <= 0)
988 return 0;
989
990 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
991 }
992
993 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
994 _cleanup_free_ struct in_addr *addresses = NULL;
995 size_t n_addresses = 0, n_allocated = 0;
996 char **a;
997
998 if (!link->network)
999 return 0;
1000
1001 log_debug("Copying NTP server information from %s", link->ifname);
1002
1003 STRV_FOREACH(a, link->network->ntp) {
1004 struct in_addr ia;
1005
1006 /* Only look for IPv4 addresses */
1007 if (inet_pton(AF_INET, *a, &ia) <= 0)
1008 continue;
1009
1010 /* Never propagate obviously borked data */
1011 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1012 continue;
1013
1014 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1015 return log_oom();
1016
1017 addresses[n_addresses++] = ia;
1018 }
1019
1020 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1021 const struct in_addr *da = NULL;
1022 int n;
1023
1024 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1025 if (n > 0) {
1026
1027 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1028 return log_oom();
1029
1030 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
1031 n_addresses += n;
1032 }
1033 }
1034
1035 if (n_addresses <= 0)
1036 return 0;
1037
1038 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1039 }
1040
1041 static int link_set_bridge_fdb(Link *link) {
1042 FdbEntry *fdb_entry;
1043 int r;
1044
1045 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1046 r = fdb_entry_configure(link, fdb_entry);
1047 if (r < 0)
1048 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1049 }
1050
1051 return 0;
1052 }
1053
1054 static int link_enter_set_addresses(Link *link) {
1055 AddressLabel *label;
1056 Address *ad;
1057 int r;
1058
1059 assert(link);
1060 assert(link->network);
1061 assert(link->state != _LINK_STATE_INVALID);
1062
1063 r = link_set_bridge_fdb(link);
1064 if (r < 0)
1065 return r;
1066
1067 link_set_state(link, LINK_STATE_SETTING_ADDRESSES);
1068
1069 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1070 r = address_configure(ad, link, address_handler, false);
1071 if (r < 0) {
1072 log_link_warning_errno(link, r, "Could not set addresses: %m");
1073 link_enter_failed(link);
1074 return r;
1075 }
1076
1077 link->address_messages++;
1078 }
1079
1080 LIST_FOREACH(labels, label, link->network->address_labels) {
1081 r = address_label_configure(label, link, address_label_handler, false);
1082 if (r < 0) {
1083 log_link_warning_errno(link, r, "Could not set address label: %m");
1084 link_enter_failed(link);
1085 return r;
1086 }
1087
1088 link->address_label_messages++;
1089 }
1090
1091 /* now that we can figure out a default address for the dhcp server,
1092 start it */
1093 if (link_dhcp4_server_enabled(link)) {
1094 Address *address;
1095 Link *uplink = NULL;
1096 bool acquired_uplink = false;
1097
1098 address = link_find_dhcp_server_address(link);
1099 if (!address) {
1100 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1101 link_enter_failed(link);
1102 return 0;
1103 }
1104
1105 /* use the server address' subnet as the pool */
1106 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1107 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1108 if (r < 0)
1109 return r;
1110
1111 /* TODO:
1112 r = sd_dhcp_server_set_router(link->dhcp_server,
1113 &main_address->in_addr.in);
1114 if (r < 0)
1115 return r;
1116 */
1117
1118 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1119 r = sd_dhcp_server_set_max_lease_time(
1120 link->dhcp_server,
1121 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1122 if (r < 0)
1123 return r;
1124 }
1125
1126 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1127 r = sd_dhcp_server_set_default_lease_time(
1128 link->dhcp_server,
1129 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1130 if (r < 0)
1131 return r;
1132 }
1133
1134 if (link->network->dhcp_server_emit_dns) {
1135
1136 if (link->network->n_dhcp_server_dns > 0)
1137 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1138 else {
1139 uplink = manager_find_uplink(link->manager, link);
1140 acquired_uplink = true;
1141
1142 if (!uplink) {
1143 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1144 r = 0;
1145 } else
1146 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1147 }
1148 if (r < 0)
1149 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1150 }
1151
1152 if (link->network->dhcp_server_emit_ntp) {
1153
1154 if (link->network->n_dhcp_server_ntp > 0)
1155 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1156 else {
1157 if (!acquired_uplink)
1158 uplink = manager_find_uplink(link->manager, link);
1159
1160 if (!uplink) {
1161 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1162 r = 0;
1163 } else
1164 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1165
1166 }
1167 if (r < 0)
1168 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1169 }
1170
1171 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1172 if (r < 0) {
1173 log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1174 return r;
1175 }
1176
1177 if (link->network->dhcp_server_emit_timezone) {
1178 _cleanup_free_ char *buffer = NULL;
1179 const char *tz = NULL;
1180
1181 if (link->network->dhcp_server_timezone)
1182 tz = link->network->dhcp_server_timezone;
1183 else {
1184 r = get_timezone(&buffer);
1185 if (r < 0)
1186 log_warning_errno(r, "Failed to determine timezone: %m");
1187 else
1188 tz = buffer;
1189 }
1190
1191 if (tz) {
1192 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1193 if (r < 0)
1194 return r;
1195 }
1196 }
1197
1198 r = sd_dhcp_server_start(link->dhcp_server);
1199 if (r < 0) {
1200 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1201
1202 link_enter_failed(link);
1203
1204 return 0;
1205 }
1206
1207 log_link_debug(link, "Offering DHCPv4 leases");
1208 }
1209
1210 if (link->address_messages == 0)
1211 link_enter_set_routes(link);
1212 else
1213 log_link_debug(link, "Setting addresses");
1214
1215 return 0;
1216 }
1217
1218 int link_address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1219 _cleanup_(link_unrefp) Link *link = userdata;
1220 int r;
1221
1222 assert(m);
1223 assert(link);
1224 assert(link->ifname);
1225
1226 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1227 return 1;
1228
1229 r = sd_netlink_message_get_errno(m);
1230 if (r < 0 && r != -EADDRNOTAVAIL)
1231 log_link_warning_errno(link, r, "Could not drop address: %m");
1232
1233 return 1;
1234 }
1235
1236 static int link_set_bridge_vlan(Link *link) {
1237 int r = 0;
1238
1239 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1240 if (r < 0)
1241 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1242
1243 return r;
1244 }
1245
1246 static int link_set_proxy_arp(Link *link) {
1247 const char *p = NULL;
1248 int r;
1249
1250 if (!link_proxy_arp_enabled(link))
1251 return 0;
1252
1253 p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/proxy_arp");
1254
1255 r = write_string_file(p, one_zero(link->network->proxy_arp), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
1256 if (r < 0)
1257 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1258
1259 return 0;
1260 }
1261
1262 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1263 _cleanup_(link_unrefp) Link *link = userdata;
1264 int r;
1265
1266 log_link_debug(link, "Set link");
1267
1268 r = sd_netlink_message_get_errno(m);
1269 if (r < 0 && r != -EEXIST) {
1270 log_link_error_errno(link, r, "Could not join netdev: %m");
1271 link_enter_failed(link);
1272 return 1;
1273 }
1274
1275 return 0;
1276 }
1277
1278 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1279 _cleanup_(link_unrefp) Link *link = userdata;
1280 int r;
1281
1282 assert(m);
1283 assert(link);
1284 assert(link->ifname);
1285
1286 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1287 return 1;
1288
1289 r = sd_netlink_message_get_errno(m);
1290 if (r < 0)
1291 log_link_warning_errno(link, r, "Could not set MTU: %m");
1292
1293 return 1;
1294 }
1295
1296 int link_set_mtu(Link *link, uint32_t mtu) {
1297 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1298 int r;
1299
1300 assert(link);
1301 assert(link->manager);
1302 assert(link->manager->rtnl);
1303
1304 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1305
1306 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1307 if (r < 0)
1308 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1309
1310 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1311 if (r < 0)
1312 return log_link_error_errno(link, r, "Could not append MTU: %m");
1313
1314 r = sd_netlink_call_async(link->manager->rtnl, req, set_mtu_handler, link, 0, NULL);
1315 if (r < 0)
1316 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1317
1318 link->setting_mtu = true;
1319
1320 link_ref(link);
1321
1322 return 0;
1323 }
1324
1325 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1326 _cleanup_(link_unrefp) Link *link = userdata;
1327 int r;
1328
1329 assert(m);
1330 assert(link);
1331 assert(link->ifname);
1332
1333 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1334 return 1;
1335
1336 r = sd_netlink_message_get_errno(m);
1337 if (r < 0)
1338 log_link_warning_errno(link, r, "Could not set link flags: %m");
1339
1340 return 1;
1341 }
1342
1343 static int link_set_flags(Link *link) {
1344 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1345 unsigned ifi_change = 0;
1346 unsigned ifi_flags = 0;
1347 int r;
1348
1349 assert(link);
1350 assert(link->manager);
1351 assert(link->manager->rtnl);
1352
1353 if (link->flags & IFF_LOOPBACK)
1354 return 0;
1355
1356 if (!link->network)
1357 return 0;
1358
1359 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1360 return 0;
1361
1362 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1363 if (r < 0)
1364 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1365
1366 if (link->network->arp >= 0) {
1367 ifi_change |= IFF_NOARP;
1368 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1369 }
1370
1371 if (link->network->multicast >= 0) {
1372 ifi_change |= IFF_MULTICAST;
1373 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1374 }
1375
1376 if (link->network->allmulticast >= 0) {
1377 ifi_change |= IFF_ALLMULTI;
1378 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1379 }
1380
1381 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1382 if (r < 0)
1383 return log_link_error_errno(link, r, "Could not set link flags: %m");
1384
1385 r = sd_netlink_call_async(link->manager->rtnl, req, set_flags_handler, link, 0, NULL);
1386 if (r < 0)
1387 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1388
1389 link_ref(link);
1390
1391 return 0;
1392 }
1393
1394 static int link_set_bridge(Link *link) {
1395 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1396 int r;
1397
1398 assert(link);
1399 assert(link->network);
1400
1401 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1402 if (r < 0)
1403 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1404
1405 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1406 if (r < 0)
1407 return log_link_error_errno(link, r, "Could not set message family: %m");
1408
1409 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1410 if (r < 0)
1411 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1412
1413 if (link->network->use_bpdu >= 0) {
1414 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
1415 if (r < 0)
1416 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1417 }
1418
1419 if (link->network->hairpin >= 0) {
1420 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1421 if (r < 0)
1422 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1423 }
1424
1425 if (link->network->fast_leave >= 0) {
1426 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1427 if (r < 0)
1428 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1429 }
1430
1431 if (link->network->allow_port_to_be_root >= 0) {
1432 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
1433 if (r < 0)
1434 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1435
1436 }
1437
1438 if (link->network->unicast_flood >= 0) {
1439 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1440 if (r < 0)
1441 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1442
1443 }
1444
1445 if (link->network->cost != 0) {
1446 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1447 if (r < 0)
1448 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1449 }
1450 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1451 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1452 if (r < 0)
1453 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1454 }
1455
1456 r = sd_netlink_message_close_container(req);
1457 if (r < 0)
1458 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1459
1460 r = sd_netlink_call_async(link->manager->rtnl, req, link_set_handler, link, 0, NULL);
1461 if (r < 0)
1462 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1463
1464 link_ref(link);
1465
1466 return r;
1467 }
1468
1469 static int link_bond_set(Link *link) {
1470 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1471 int r;
1472
1473 assert(link);
1474 assert(link->network);
1475
1476 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1477 if (r < 0)
1478 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1479
1480 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1481 if (r < 0)
1482 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1483
1484 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1485 if (r < 0)
1486 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1487
1488 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1489 if (r < 0)
1490 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1491
1492 if (link->network->active_slave) {
1493 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1494 if (r < 0)
1495 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1496 }
1497
1498 if (link->network->primary_slave) {
1499 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1500 if (r < 0)
1501 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1502 }
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_LINKINFO attribute: %m");
1507
1508 r = sd_netlink_message_close_container(req);
1509 if (r < 0)
1510 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1511
1512 r = sd_netlink_call_async(link->manager->rtnl, req, set_flags_handler, link, 0, NULL);
1513 if (r < 0)
1514 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1515
1516 link_ref(link);
1517
1518 return r;
1519 }
1520
1521 static int link_lldp_save(Link *link) {
1522 _cleanup_free_ char *temp_path = NULL;
1523 _cleanup_fclose_ FILE *f = NULL;
1524 sd_lldp_neighbor **l = NULL;
1525 int n = 0, r, i;
1526
1527 assert(link);
1528 assert(link->lldp_file);
1529
1530 if (!link->lldp) {
1531 (void) unlink(link->lldp_file);
1532 return 0;
1533 }
1534
1535 r = sd_lldp_get_neighbors(link->lldp, &l);
1536 if (r < 0)
1537 goto finish;
1538 if (r == 0) {
1539 (void) unlink(link->lldp_file);
1540 goto finish;
1541 }
1542
1543 n = r;
1544
1545 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1546 if (r < 0)
1547 goto finish;
1548
1549 fchmod(fileno(f), 0644);
1550
1551 for (i = 0; i < n; i++) {
1552 const void *p;
1553 le64_t u;
1554 size_t sz;
1555
1556 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1557 if (r < 0)
1558 goto finish;
1559
1560 u = htole64(sz);
1561 (void) fwrite(&u, 1, sizeof(u), f);
1562 (void) fwrite(p, 1, sz, f);
1563 }
1564
1565 r = fflush_and_check(f);
1566 if (r < 0)
1567 goto finish;
1568
1569 if (rename(temp_path, link->lldp_file) < 0) {
1570 r = -errno;
1571 goto finish;
1572 }
1573
1574 finish:
1575 if (r < 0) {
1576 (void) unlink(link->lldp_file);
1577 if (temp_path)
1578 (void) unlink(temp_path);
1579
1580 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1581 }
1582
1583 if (l) {
1584 for (i = 0; i < n; i++)
1585 sd_lldp_neighbor_unref(l[i]);
1586 free(l);
1587 }
1588
1589 return r;
1590 }
1591
1592 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1593 Link *link = userdata;
1594 int r;
1595
1596 assert(link);
1597
1598 (void) link_lldp_save(link);
1599
1600 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1601 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1602
1603 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1604
1605 r = link_lldp_emit_start(link);
1606 if (r < 0)
1607 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1608 }
1609 }
1610
1611 static int link_acquire_ipv6_conf(Link *link) {
1612 int r;
1613
1614 assert(link);
1615
1616 if (link_dhcp6_enabled(link)) {
1617 assert(link->dhcp6_client);
1618 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1619
1620 /* start DHCPv6 client in stateless mode */
1621 r = dhcp6_request_address(link, true);
1622 if (r < 0 && r != -EBUSY)
1623 return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m");
1624 else
1625 log_link_debug(link, "Acquiring DHCPv6 lease");
1626 }
1627
1628 if (link_ipv6_accept_ra_enabled(link)) {
1629 assert(link->ndisc);
1630
1631 log_link_debug(link, "Discovering IPv6 routers");
1632
1633 r = sd_ndisc_start(link->ndisc);
1634 if (r < 0 && r != -EBUSY)
1635 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1636 }
1637
1638 if (link_radv_enabled(link)) {
1639 assert(link->radv);
1640 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1641
1642 log_link_debug(link, "Starting IPv6 Router Advertisements");
1643
1644 r = sd_radv_start(link->radv);
1645 if (r < 0 && r != -EBUSY)
1646 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1647 }
1648
1649 return 0;
1650 }
1651
1652 static int link_acquire_ipv4_conf(Link *link) {
1653 int r;
1654
1655 assert(link);
1656 assert(link->network);
1657 assert(link->manager);
1658 assert(link->manager->event);
1659
1660 if (link_ipv4ll_enabled(link)) {
1661 assert(link->ipv4ll);
1662
1663 log_link_debug(link, "Acquiring IPv4 link-local address");
1664
1665 r = sd_ipv4ll_start(link->ipv4ll);
1666 if (r < 0)
1667 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1668 }
1669
1670 if (link_dhcp4_enabled(link)) {
1671 assert(link->dhcp_client);
1672
1673 log_link_debug(link, "Acquiring DHCPv4 lease");
1674
1675 r = sd_dhcp_client_start(link->dhcp_client);
1676 if (r < 0)
1677 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1678 }
1679
1680 return 0;
1681 }
1682
1683 static int link_acquire_conf(Link *link) {
1684 int r;
1685
1686 assert(link);
1687
1688 if (link->setting_mtu) {
1689 link->setting_mtu = false;
1690 return 0;
1691 }
1692
1693 r = link_acquire_ipv4_conf(link);
1694 if (r < 0)
1695 return r;
1696
1697 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) == 0) {
1698 r = link_acquire_ipv6_conf(link);
1699 if (r < 0)
1700 return r;
1701 }
1702
1703 if (link_lldp_emit_enabled(link)) {
1704 r = link_lldp_emit_start(link);
1705 if (r < 0)
1706 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1707 }
1708
1709 return 0;
1710 }
1711
1712 bool link_has_carrier(Link *link) {
1713 /* see Documentation/networking/operstates.txt in the kernel sources */
1714
1715 if (link->kernel_operstate == IF_OPER_UP)
1716 return true;
1717
1718 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1719 /* operstate may not be implemented, so fall back to flags */
1720 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1721 return true;
1722
1723 return false;
1724 }
1725
1726 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1727 _cleanup_(link_unrefp) Link *link = userdata;
1728 int r;
1729
1730 assert(link);
1731
1732 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1733 return 1;
1734
1735 r = sd_netlink_message_get_errno(m);
1736 if (r < 0)
1737 /* we warn but don't fail the link, as it may be
1738 brought up later */
1739 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1740
1741 return 1;
1742 }
1743
1744 int link_up(Link *link) {
1745 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1746 uint8_t ipv6ll_mode;
1747 int r;
1748
1749 assert(link);
1750 assert(link->network);
1751 assert(link->manager);
1752 assert(link->manager->rtnl);
1753
1754 log_link_debug(link, "Bringing link up");
1755
1756 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1757 if (r < 0)
1758 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1759
1760 /* set it free if not enslaved with networkd */
1761 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1762 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1763 if (r < 0)
1764 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1765 }
1766
1767 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1768 if (r < 0)
1769 return log_link_error_errno(link, r, "Could not set link flags: %m");
1770
1771 if (link->network->mac) {
1772 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1773 if (r < 0)
1774 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1775 }
1776
1777 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1778 for this interface, or if it is a bridge slave, then disable IPv6 else enable it. */
1779 (void) link_enable_ipv6(link);
1780
1781 if (link->network->mtu != 0) {
1782 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1783 on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1784 if (link_ipv6_enabled(link) && link->network->mtu < IPV6_MIN_MTU) {
1785
1786 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1787 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1788
1789 link->network->mtu = IPV6_MIN_MTU;
1790 }
1791
1792 r = sd_netlink_message_append_u32(req, IFLA_MTU, link->network->mtu);
1793 if (r < 0)
1794 return log_link_error_errno(link, r, "Could not set MTU: %m");
1795 }
1796
1797 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1798 if (r < 0)
1799 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1800
1801 if (link_ipv6_enabled(link)) {
1802 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
1803 r = sd_netlink_message_open_container(req, AF_INET6);
1804 if (r < 0)
1805 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1806
1807 if (!link_ipv6ll_enabled(link))
1808 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1809 else {
1810 const char *p = NULL;
1811 _cleanup_free_ char *stable_secret = NULL;
1812
1813 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/stable_secret");
1814 r = read_one_line_file(p, &stable_secret);
1815
1816 if (r < 0)
1817 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1818 else
1819 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1820 }
1821 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1822 if (r < 0)
1823 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1824
1825 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
1826 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
1827 if (r < 0)
1828 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
1829 }
1830
1831 r = sd_netlink_message_close_container(req);
1832 if (r < 0)
1833 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1834 }
1835
1836 r = sd_netlink_message_close_container(req);
1837 if (r < 0)
1838 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1839
1840 r = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
1841 if (r < 0)
1842 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1843
1844 link_ref(link);
1845
1846 return 0;
1847 }
1848
1849 static int link_up_can(Link *link) {
1850 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1851 int r;
1852
1853 assert(link);
1854
1855 log_link_debug(link, "Bringing CAN link up");
1856
1857 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1858 if (r < 0)
1859 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1860
1861 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1862 if (r < 0)
1863 return log_link_error_errno(link, r, "Could not set link flags: %m");
1864
1865 r = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
1866 if (r < 0)
1867 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1868
1869 link_ref(link);
1870
1871 return 0;
1872 }
1873
1874 static int link_set_can(Link *link) {
1875 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
1876 int r;
1877
1878 assert(link);
1879 assert(link->network);
1880 assert(link->manager);
1881 assert(link->manager->rtnl);
1882
1883 log_link_debug(link, "link_set_can");
1884
1885 r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
1886 if (r < 0)
1887 return log_link_error_errno(link, r, "Failed to allocate netlink message: %m");
1888
1889 r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
1890 if (r < 0)
1891 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1892
1893 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
1894 if (r < 0)
1895 return log_link_error_errno(link, r, "Failed to open netlink container: %m");
1896
1897 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
1898 if (r < 0)
1899 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1900
1901 if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) {
1902 struct can_bittiming bt = {
1903 .bitrate = link->network->can_bitrate,
1904 .sample_point = link->network->can_sample_point,
1905 };
1906
1907 if (link->network->can_bitrate > UINT32_MAX) {
1908 log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate);
1909 return -ERANGE;
1910 }
1911
1912 log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate);
1913 if (link->network->can_sample_point > 0)
1914 log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
1915 else
1916 log_link_debug(link, "Using default sample point");
1917
1918 r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
1919 if (r < 0)
1920 return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
1921 }
1922
1923 if (link->network->can_restart_us > 0) {
1924 char time_string[FORMAT_TIMESPAN_MAX];
1925 uint64_t restart_ms;
1926
1927 if (link->network->can_restart_us == USEC_INFINITY)
1928 restart_ms = 0;
1929 else
1930 restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC);
1931
1932 format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC);
1933
1934 if (restart_ms > UINT32_MAX) {
1935 log_link_error(link, "restart timeout (%s) too big.", time_string);
1936 return -ERANGE;
1937 }
1938
1939 log_link_debug(link, "Setting restart = %s", time_string);
1940
1941 r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
1942 if (r < 0)
1943 return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
1944 }
1945
1946 r = sd_netlink_message_close_container(m);
1947 if (r < 0)
1948 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
1949
1950 r = sd_netlink_message_close_container(m);
1951 if (r < 0)
1952 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
1953
1954 r = sd_netlink_call_async(link->manager->rtnl, m, link_set_handler, link, 0, NULL);
1955 if (r < 0)
1956 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1957
1958 link_ref(link);
1959
1960 if (!(link->flags & IFF_UP)) {
1961 r = link_up_can(link);
1962 if (r < 0) {
1963 link_enter_failed(link);
1964 return r;
1965 }
1966 }
1967
1968 log_link_debug(link, "link_set_can done");
1969
1970 return r;
1971 }
1972
1973 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1974 _cleanup_(link_unrefp) Link *link = userdata;
1975 int r;
1976
1977 assert(link);
1978
1979 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1980 return 1;
1981
1982 r = sd_netlink_message_get_errno(m);
1983 if (r < 0)
1984 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1985
1986 if (streq_ptr(link->kind, "can")) {
1987 link_ref(link);
1988 link_set_can(link);
1989 }
1990
1991 return 1;
1992 }
1993
1994 int link_down(Link *link) {
1995 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1996 int r;
1997
1998 assert(link);
1999 assert(link->manager);
2000 assert(link->manager->rtnl);
2001
2002 log_link_debug(link, "Bringing link down");
2003
2004 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
2005 RTM_SETLINK, link->ifindex);
2006 if (r < 0)
2007 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2008
2009 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
2010 if (r < 0)
2011 return log_link_error_errno(link, r, "Could not set link flags: %m");
2012
2013 r = sd_netlink_call_async(link->manager->rtnl, req, link_down_handler, link, 0, NULL);
2014 if (r < 0)
2015 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2016
2017 link_ref(link);
2018
2019 return 0;
2020 }
2021
2022 static int link_handle_bound_to_list(Link *link) {
2023 Link *l;
2024 Iterator i;
2025 int r;
2026 bool required_up = false;
2027 bool link_is_up = false;
2028
2029 assert(link);
2030
2031 if (hashmap_isempty(link->bound_to_links))
2032 return 0;
2033
2034 if (link->flags & IFF_UP)
2035 link_is_up = true;
2036
2037 HASHMAP_FOREACH (l, link->bound_to_links, i)
2038 if (link_has_carrier(l)) {
2039 required_up = true;
2040 break;
2041 }
2042
2043 if (!required_up && link_is_up) {
2044 r = link_down(link);
2045 if (r < 0)
2046 return r;
2047 } else if (required_up && !link_is_up) {
2048 r = link_up(link);
2049 if (r < 0)
2050 return r;
2051 }
2052
2053 return 0;
2054 }
2055
2056 static int link_handle_bound_by_list(Link *link) {
2057 Iterator i;
2058 Link *l;
2059 int r;
2060
2061 assert(link);
2062
2063 if (hashmap_isempty(link->bound_by_links))
2064 return 0;
2065
2066 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2067 r = link_handle_bound_to_list(l);
2068 if (r < 0)
2069 return r;
2070 }
2071
2072 return 0;
2073 }
2074
2075 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2076 int r;
2077
2078 assert(link);
2079 assert(carrier);
2080
2081 if (link == carrier)
2082 return 0;
2083
2084 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2085 return 0;
2086
2087 r = hashmap_ensure_allocated(h, NULL);
2088 if (r < 0)
2089 return r;
2090
2091 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2092 if (r < 0)
2093 return r;
2094
2095 return 0;
2096 }
2097
2098 static int link_new_bound_by_list(Link *link) {
2099 Manager *m;
2100 Link *carrier;
2101 Iterator i;
2102 int r;
2103 bool list_updated = false;
2104
2105 assert(link);
2106 assert(link->manager);
2107
2108 m = link->manager;
2109
2110 HASHMAP_FOREACH(carrier, m->links, i) {
2111 if (!carrier->network)
2112 continue;
2113
2114 if (strv_isempty(carrier->network->bind_carrier))
2115 continue;
2116
2117 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2118 r = link_put_carrier(link, carrier, &link->bound_by_links);
2119 if (r < 0)
2120 return r;
2121
2122 list_updated = true;
2123 }
2124 }
2125
2126 if (list_updated)
2127 link_dirty(link);
2128
2129 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2130 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2131 if (r < 0)
2132 return r;
2133
2134 link_dirty(carrier);
2135 }
2136
2137 return 0;
2138 }
2139
2140 static int link_new_bound_to_list(Link *link) {
2141 Manager *m;
2142 Link *carrier;
2143 Iterator i;
2144 int r;
2145 bool list_updated = false;
2146
2147 assert(link);
2148 assert(link->manager);
2149
2150 if (!link->network)
2151 return 0;
2152
2153 if (strv_isempty(link->network->bind_carrier))
2154 return 0;
2155
2156 m = link->manager;
2157
2158 HASHMAP_FOREACH (carrier, m->links, i) {
2159 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2160 r = link_put_carrier(link, carrier, &link->bound_to_links);
2161 if (r < 0)
2162 return r;
2163
2164 list_updated = true;
2165 }
2166 }
2167
2168 if (list_updated)
2169 link_dirty(link);
2170
2171 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2172 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2173 if (r < 0)
2174 return r;
2175
2176 link_dirty(carrier);
2177 }
2178
2179 return 0;
2180 }
2181
2182 static int link_new_carrier_maps(Link *link) {
2183 int r;
2184
2185 r = link_new_bound_by_list(link);
2186 if (r < 0)
2187 return r;
2188
2189 r = link_handle_bound_by_list(link);
2190 if (r < 0)
2191 return r;
2192
2193 r = link_new_bound_to_list(link);
2194 if (r < 0)
2195 return r;
2196
2197 r = link_handle_bound_to_list(link);
2198 if (r < 0)
2199 return r;
2200
2201 return 0;
2202 }
2203
2204 static void link_free_bound_to_list(Link *link) {
2205 Link *bound_to;
2206 Iterator i;
2207
2208 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2209 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2210
2211 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2212 link_dirty(bound_to);
2213 }
2214
2215 return;
2216 }
2217
2218 static void link_free_bound_by_list(Link *link) {
2219 Link *bound_by;
2220 Iterator i;
2221
2222 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2223 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2224
2225 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2226 link_dirty(bound_by);
2227 link_handle_bound_to_list(bound_by);
2228 }
2229 }
2230
2231 return;
2232 }
2233
2234 static void link_free_carrier_maps(Link *link) {
2235 bool list_updated = false;
2236
2237 assert(link);
2238
2239 if (!hashmap_isempty(link->bound_to_links)) {
2240 link_free_bound_to_list(link);
2241 list_updated = true;
2242 }
2243
2244 if (!hashmap_isempty(link->bound_by_links)) {
2245 link_free_bound_by_list(link);
2246 list_updated = true;
2247 }
2248
2249 if (list_updated)
2250 link_dirty(link);
2251
2252 return;
2253 }
2254
2255 void link_drop(Link *link) {
2256 if (!link || link->state == LINK_STATE_LINGER)
2257 return;
2258
2259 link_set_state(link, LINK_STATE_LINGER);
2260
2261 link_free_carrier_maps(link);
2262
2263 log_link_debug(link, "Link removed");
2264
2265 (void)unlink(link->state_file);
2266 link_unref(link);
2267
2268 return;
2269 }
2270
2271 static int link_joined(Link *link) {
2272 int r;
2273
2274 assert(link);
2275 assert(link->network);
2276
2277 if (!hashmap_isempty(link->bound_to_links)) {
2278 r = link_handle_bound_to_list(link);
2279 if (r < 0)
2280 return r;
2281 } else if (!(link->flags & IFF_UP)) {
2282 r = link_up(link);
2283 if (r < 0) {
2284 link_enter_failed(link);
2285 return r;
2286 }
2287 }
2288
2289 if (link->network->bridge) {
2290 r = link_set_bridge(link);
2291 if (r < 0)
2292 log_link_error_errno(link, r, "Could not set bridge message: %m");
2293 }
2294
2295 if (link->network->bond) {
2296 r = link_bond_set(link);
2297 if (r < 0)
2298 log_link_error_errno(link, r, "Could not set bond message: %m");
2299 }
2300
2301 if (link->network->use_br_vlan &&
2302 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2303 r = link_set_bridge_vlan(link);
2304 if (r < 0)
2305 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2306 }
2307
2308 /* Skip setting up addresses until it gets carrier,
2309 or it would try to set addresses twice,
2310 which is bad for non-idempotent steps. */
2311 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2312 return 0;
2313
2314 return link_enter_set_addresses(link);
2315 }
2316
2317 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
2318 _cleanup_(link_unrefp) Link *link = userdata;
2319 int r;
2320
2321 assert(link);
2322 assert(link->network);
2323
2324 link->enslaving--;
2325
2326 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2327 return 1;
2328
2329 r = sd_netlink_message_get_errno(m);
2330 if (r < 0 && r != -EEXIST) {
2331 log_link_error_errno(link, r, "Could not join netdev: %m");
2332 link_enter_failed(link);
2333 return 1;
2334 } else
2335 log_link_debug(link, "Joined netdev");
2336
2337 if (link->enslaving <= 0)
2338 link_joined(link);
2339
2340 return 1;
2341 }
2342
2343 static int link_enter_join_netdev(Link *link) {
2344 NetDev *netdev;
2345 Iterator i;
2346 int r;
2347
2348 assert(link);
2349 assert(link->network);
2350 assert(link->state == LINK_STATE_PENDING);
2351
2352 link_set_state(link, LINK_STATE_ENSLAVING);
2353
2354 link_dirty(link);
2355
2356 if (!link->network->bridge &&
2357 !link->network->bond &&
2358 !link->network->vrf &&
2359 hashmap_isempty(link->network->stacked_netdevs))
2360 return link_joined(link);
2361
2362 if (link->network->bond) {
2363 log_struct(LOG_DEBUG,
2364 LOG_LINK_INTERFACE(link),
2365 LOG_NETDEV_INTERFACE(link->network->bond),
2366 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2367
2368 r = netdev_join(link->network->bond, link, netdev_join_handler);
2369 if (r < 0) {
2370 log_struct_errno(LOG_WARNING, r,
2371 LOG_LINK_INTERFACE(link),
2372 LOG_NETDEV_INTERFACE(link->network->bond),
2373 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2374 link_enter_failed(link);
2375 return r;
2376 }
2377
2378 link->enslaving++;
2379 }
2380
2381 if (link->network->bridge) {
2382 log_struct(LOG_DEBUG,
2383 LOG_LINK_INTERFACE(link),
2384 LOG_NETDEV_INTERFACE(link->network->bridge),
2385 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2386
2387 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2388 if (r < 0) {
2389 log_struct_errno(LOG_WARNING, r,
2390 LOG_LINK_INTERFACE(link),
2391 LOG_NETDEV_INTERFACE(link->network->bridge),
2392 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2393 link_enter_failed(link);
2394 return r;
2395 }
2396
2397 link->enslaving++;
2398 }
2399
2400 if (link->network->vrf) {
2401 log_struct(LOG_DEBUG,
2402 LOG_LINK_INTERFACE(link),
2403 LOG_NETDEV_INTERFACE(link->network->vrf),
2404 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2405
2406 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2407 if (r < 0) {
2408 log_struct_errno(LOG_WARNING, r,
2409 LOG_LINK_INTERFACE(link),
2410 LOG_NETDEV_INTERFACE(link->network->vrf),
2411 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2412 link_enter_failed(link);
2413 return r;
2414 }
2415
2416 link->enslaving++;
2417 }
2418
2419 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2420
2421 if (netdev->ifindex > 0) {
2422 link_joined(link);
2423 continue;
2424 }
2425
2426 log_struct(LOG_DEBUG,
2427 LOG_LINK_INTERFACE(link),
2428 LOG_NETDEV_INTERFACE(netdev),
2429 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2430
2431 r = netdev_join(netdev, link, netdev_join_handler);
2432 if (r < 0) {
2433 log_struct_errno(LOG_WARNING, r,
2434 LOG_LINK_INTERFACE(link),
2435 LOG_NETDEV_INTERFACE(netdev),
2436 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2437 link_enter_failed(link);
2438 return r;
2439 }
2440
2441 link->enslaving++;
2442 }
2443
2444 return 0;
2445 }
2446
2447 static int link_set_ipv4_forward(Link *link) {
2448 int r;
2449
2450 if (!link_ipv4_forward_enabled(link))
2451 return 0;
2452
2453 /* We propagate the forwarding flag from one interface to the
2454 * global setting one way. This means: as long as at least one
2455 * interface was configured at any time that had IP forwarding
2456 * enabled the setting will stay on for good. We do this
2457 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2458 * somewhat in sync (see below). */
2459
2460 r = write_string_file("/proc/sys/net/ipv4/ip_forward", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2461 if (r < 0)
2462 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2463
2464 return 0;
2465 }
2466
2467 static int link_set_ipv6_forward(Link *link) {
2468 int r;
2469
2470 if (!link_ipv6_forward_enabled(link))
2471 return 0;
2472
2473 /* On Linux, the IPv6 stack does not know a per-interface
2474 * packet forwarding setting: either packet forwarding is on
2475 * for all, or off for all. We hence don't bother with a
2476 * per-interface setting, but simply propagate the interface
2477 * flag, if it is set, to the global flag, one-way. Note that
2478 * while IPv4 would allow a per-interface flag, we expose the
2479 * same behaviour there and also propagate the setting from
2480 * one to all, to keep things simple (see above). */
2481
2482 r = write_string_file("/proc/sys/net/ipv6/conf/all/forwarding", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2483 if (r < 0)
2484 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2485
2486 return 0;
2487 }
2488
2489 static int link_set_ipv6_privacy_extensions(Link *link) {
2490 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2491 IPv6PrivacyExtensions s;
2492 const char *p = NULL;
2493 int r;
2494
2495 s = link_ipv6_privacy_extensions(link);
2496 if (s < 0)
2497 return 0;
2498
2499 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/use_tempaddr");
2500 xsprintf(buf, "%u", (unsigned) link->network->ipv6_privacy_extensions);
2501
2502 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2503 if (r < 0)
2504 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2505
2506 return 0;
2507 }
2508
2509 static int link_set_ipv6_accept_ra(Link *link) {
2510 const char *p = NULL;
2511 int r;
2512
2513 /* Make this a NOP if IPv6 is not available */
2514 if (!socket_ipv6_is_supported())
2515 return 0;
2516
2517 if (link->flags & IFF_LOOPBACK)
2518 return 0;
2519
2520 if (!link->network)
2521 return 0;
2522
2523 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/accept_ra");
2524
2525 /* We handle router advertisements ourselves, tell the kernel to GTFO */
2526 r = write_string_file(p, "0", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2527 if (r < 0)
2528 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2529
2530 return 0;
2531 }
2532
2533 static int link_set_ipv6_dad_transmits(Link *link) {
2534 char buf[DECIMAL_STR_MAX(int) + 1];
2535 const char *p = NULL;
2536 int r;
2537
2538 /* Make this a NOP if IPv6 is not available */
2539 if (!socket_ipv6_is_supported())
2540 return 0;
2541
2542 if (link->flags & IFF_LOOPBACK)
2543 return 0;
2544
2545 if (!link->network)
2546 return 0;
2547
2548 if (link->network->ipv6_dad_transmits < 0)
2549 return 0;
2550
2551 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/dad_transmits");
2552 xsprintf(buf, "%i", link->network->ipv6_dad_transmits);
2553
2554 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2555 if (r < 0)
2556 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2557
2558 return 0;
2559 }
2560
2561 static int link_set_ipv6_hop_limit(Link *link) {
2562 char buf[DECIMAL_STR_MAX(int) + 1];
2563 const char *p = NULL;
2564 int r;
2565
2566 /* Make this a NOP if IPv6 is not available */
2567 if (!socket_ipv6_is_supported())
2568 return 0;
2569
2570 if (link->flags & IFF_LOOPBACK)
2571 return 0;
2572
2573 if (!link->network)
2574 return 0;
2575
2576 if (link->network->ipv6_hop_limit < 0)
2577 return 0;
2578
2579 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/hop_limit");
2580 xsprintf(buf, "%i", link->network->ipv6_hop_limit);
2581
2582 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2583 if (r < 0)
2584 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2585
2586 return 0;
2587 }
2588
2589 static int link_set_ipv6_mtu(Link *link) {
2590 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2591 const char *p = NULL;
2592 int r;
2593
2594 /* Make this a NOP if IPv6 is not available */
2595 if (!socket_ipv6_is_supported())
2596 return 0;
2597
2598 if (link->flags & IFF_LOOPBACK)
2599 return 0;
2600
2601 if (link->network->ipv6_mtu == 0)
2602 return 0;
2603
2604 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/mtu");
2605
2606 xsprintf(buf, "%" PRIu32, link->network->ipv6_mtu);
2607
2608 r = write_string_file(p, buf, 0);
2609 if (r < 0)
2610 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2611
2612 return 0;
2613 }
2614
2615 static int link_drop_foreign_config(Link *link) {
2616 Address *address;
2617 Route *route;
2618 Iterator i;
2619 int r;
2620
2621 SET_FOREACH(address, link->addresses_foreign, i) {
2622 /* we consider IPv6LL addresses to be managed by the kernel */
2623 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2624 continue;
2625
2626 r = address_remove(address, link, link_address_remove_handler);
2627 if (r < 0)
2628 return r;
2629 }
2630
2631 SET_FOREACH(route, link->routes_foreign, i) {
2632 /* do not touch routes managed by the kernel */
2633 if (route->protocol == RTPROT_KERNEL)
2634 continue;
2635
2636 r = route_remove(route, link, link_route_remove_handler);
2637 if (r < 0)
2638 return r;
2639 }
2640
2641 return 0;
2642 }
2643
2644 static int link_drop_config(Link *link) {
2645 Address *address, *pool_address;
2646 Route *route;
2647 Iterator i;
2648 int r;
2649
2650 SET_FOREACH(address, link->addresses, i) {
2651 /* we consider IPv6LL addresses to be managed by the kernel */
2652 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2653 continue;
2654
2655 r = address_remove(address, link, link_address_remove_handler);
2656 if (r < 0)
2657 return r;
2658
2659 /* If this address came from an address pool, clean up the pool */
2660 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2661 if (address_equal(address, pool_address)) {
2662 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2663 address_free(pool_address);
2664 break;
2665 }
2666 }
2667 }
2668
2669 SET_FOREACH(route, link->routes, i) {
2670 /* do not touch routes managed by the kernel */
2671 if (route->protocol == RTPROT_KERNEL)
2672 continue;
2673
2674 r = route_remove(route, link, link_route_remove_handler);
2675 if (r < 0)
2676 return r;
2677 }
2678
2679 ndisc_flush(link);
2680
2681 return 0;
2682 }
2683
2684 static int link_update_lldp(Link *link) {
2685 int r;
2686
2687 assert(link);
2688
2689 if (!link->lldp)
2690 return 0;
2691
2692 if (link->flags & IFF_UP) {
2693 r = sd_lldp_start(link->lldp);
2694 if (r > 0)
2695 log_link_debug(link, "Started LLDP.");
2696 } else {
2697 r = sd_lldp_stop(link->lldp);
2698 if (r > 0)
2699 log_link_debug(link, "Stopped LLDP.");
2700 }
2701
2702 return r;
2703 }
2704
2705 static int link_configure_can(Link *link) {
2706 int r;
2707
2708 if (streq_ptr(link->kind, "can")) {
2709 /* The CAN interface must be down to configure bitrate, etc... */
2710 if ((link->flags & IFF_UP)) {
2711 r = link_down(link);
2712 if (r < 0) {
2713 link_enter_failed(link);
2714 return r;
2715 }
2716
2717 return 0;
2718 }
2719
2720 return link_set_can(link);
2721 }
2722
2723 if (!(link->flags & IFF_UP)) {
2724 r = link_up_can(link);
2725 if (r < 0) {
2726 link_enter_failed(link);
2727 return r;
2728 }
2729 }
2730
2731 return 0;
2732 }
2733
2734 static int link_configure(Link *link) {
2735 int r;
2736
2737 assert(link);
2738 assert(link->network);
2739 assert(link->state == LINK_STATE_PENDING);
2740
2741 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
2742 return link_configure_can(link);
2743
2744 /* Drop foreign config, but ignore loopback or critical devices.
2745 * We do not want to remove loopback address or addresses used for root NFS. */
2746 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2747 r = link_drop_foreign_config(link);
2748 if (r < 0)
2749 return r;
2750 }
2751
2752 r = link_set_proxy_arp(link);
2753 if (r < 0)
2754 return r;
2755
2756 r = ipv6_proxy_ndp_addresses_configure(link);
2757 if (r < 0)
2758 return r;
2759
2760 r = link_set_ipv4_forward(link);
2761 if (r < 0)
2762 return r;
2763
2764 r = link_set_ipv6_forward(link);
2765 if (r < 0)
2766 return r;
2767
2768 r = link_set_ipv6_privacy_extensions(link);
2769 if (r < 0)
2770 return r;
2771
2772 r = link_set_ipv6_accept_ra(link);
2773 if (r < 0)
2774 return r;
2775
2776 r = link_set_ipv6_dad_transmits(link);
2777 if (r < 0)
2778 return r;
2779
2780 r = link_set_ipv6_hop_limit(link);
2781 if (r < 0)
2782 return r;
2783
2784 r = link_set_flags(link);
2785 if (r < 0)
2786 return r;
2787
2788 r = link_set_ipv6_mtu(link);
2789 if (r < 0)
2790 return r;
2791
2792 if (link_ipv4ll_enabled(link)) {
2793 r = ipv4ll_configure(link);
2794 if (r < 0)
2795 return r;
2796 }
2797
2798 if (link_dhcp4_enabled(link)) {
2799 r = dhcp4_set_promote_secondaries(link);
2800 if (r < 0)
2801 return r;
2802
2803 r = dhcp4_configure(link);
2804 if (r < 0)
2805 return r;
2806 }
2807
2808 if (link_dhcp4_server_enabled(link)) {
2809 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2810 if (r < 0)
2811 return r;
2812
2813 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2814 if (r < 0)
2815 return r;
2816 }
2817
2818 if (link_dhcp6_enabled(link) ||
2819 link_ipv6_accept_ra_enabled(link)) {
2820 r = dhcp6_configure(link);
2821 if (r < 0)
2822 return r;
2823 }
2824
2825 if (link_ipv6_accept_ra_enabled(link)) {
2826 r = ndisc_configure(link);
2827 if (r < 0)
2828 return r;
2829 }
2830
2831 if (link_radv_enabled(link)) {
2832 r = radv_configure(link);
2833 if (r < 0)
2834 return r;
2835 }
2836
2837 if (link_lldp_rx_enabled(link)) {
2838 r = sd_lldp_new(&link->lldp);
2839 if (r < 0)
2840 return r;
2841
2842 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
2843 if (r < 0)
2844 return r;
2845
2846 r = sd_lldp_match_capabilities(link->lldp,
2847 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
2848 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
2849 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
2850 if (r < 0)
2851 return r;
2852
2853 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
2854 if (r < 0)
2855 return r;
2856
2857 r = sd_lldp_attach_event(link->lldp, NULL, 0);
2858 if (r < 0)
2859 return r;
2860
2861 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
2862 if (r < 0)
2863 return r;
2864
2865 r = link_update_lldp(link);
2866 if (r < 0)
2867 return r;
2868 }
2869
2870 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2871 r = link_acquire_conf(link);
2872 if (r < 0)
2873 return r;
2874 }
2875
2876 return link_enter_join_netdev(link);
2877 }
2878
2879 static int link_initialized_and_synced(sd_netlink *rtnl, sd_netlink_message *m,
2880 void *userdata) {
2881 _cleanup_(link_unrefp) Link *link = userdata;
2882 Network *network;
2883 int r;
2884
2885 assert(link);
2886 assert(link->ifname);
2887 assert(link->manager);
2888
2889 if (link->state != LINK_STATE_PENDING)
2890 return 1;
2891
2892 log_link_debug(link, "Link state is up-to-date");
2893
2894 r = link_new_bound_by_list(link);
2895 if (r < 0)
2896 return r;
2897
2898 r = link_handle_bound_by_list(link);
2899 if (r < 0)
2900 return r;
2901
2902 if (!link->network) {
2903 r = network_get(link->manager, link->udev_device, link->ifname,
2904 &link->mac, &network);
2905 if (r == -ENOENT) {
2906 link_enter_unmanaged(link);
2907 return 1;
2908 } else if (r == 0 && network->unmanaged) {
2909 link_enter_unmanaged(link);
2910 return 0;
2911 } else if (r < 0)
2912 return r;
2913
2914 if (link->flags & IFF_LOOPBACK) {
2915 if (network->link_local != ADDRESS_FAMILY_NO)
2916 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2917
2918 if (network->dhcp != ADDRESS_FAMILY_NO)
2919 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2920
2921 if (network->dhcp_server)
2922 log_link_debug(link, "Ignoring DHCP server for loopback link");
2923 }
2924
2925 r = network_apply(network, link);
2926 if (r < 0)
2927 return r;
2928 }
2929
2930 r = link_new_bound_to_list(link);
2931 if (r < 0)
2932 return r;
2933
2934 r = link_configure(link);
2935 if (r < 0)
2936 return r;
2937
2938 return 1;
2939 }
2940
2941 int link_initialized(Link *link, struct udev_device *device) {
2942 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2943 int r;
2944
2945 assert(link);
2946 assert(link->manager);
2947 assert(link->manager->rtnl);
2948 assert(device);
2949
2950 if (link->state != LINK_STATE_PENDING)
2951 return 0;
2952
2953 if (link->udev_device)
2954 return 0;
2955
2956 log_link_debug(link, "udev initialized link");
2957
2958 link->udev_device = udev_device_ref(device);
2959
2960 /* udev has initialized the link, but we don't know if we have yet
2961 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2962 * when it returns we know that the pending NEWLINKs have already been
2963 * processed and that we are up-to-date */
2964
2965 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2966 link->ifindex);
2967 if (r < 0)
2968 return r;
2969
2970 r = sd_netlink_call_async(link->manager->rtnl, req,
2971 link_initialized_and_synced, link, 0, NULL);
2972 if (r < 0)
2973 return r;
2974
2975 link_ref(link);
2976
2977 return 0;
2978 }
2979
2980 static int link_load(Link *link) {
2981 _cleanup_free_ char *network_file = NULL,
2982 *addresses = NULL,
2983 *routes = NULL,
2984 *dhcp4_address = NULL,
2985 *ipv4ll_address = NULL;
2986 union in_addr_union address;
2987 union in_addr_union route_dst;
2988 const char *p;
2989 int r;
2990
2991 assert(link);
2992
2993 r = parse_env_file(NULL, link->state_file, NEWLINE,
2994 "NETWORK_FILE", &network_file,
2995 "ADDRESSES", &addresses,
2996 "ROUTES", &routes,
2997 "DHCP4_ADDRESS", &dhcp4_address,
2998 "IPV4LL_ADDRESS", &ipv4ll_address,
2999 NULL);
3000 if (r < 0 && r != -ENOENT)
3001 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3002
3003 if (network_file) {
3004 Network *network;
3005 char *suffix;
3006
3007 /* drop suffix */
3008 suffix = strrchr(network_file, '.');
3009 if (!suffix) {
3010 log_link_debug(link, "Failed to get network name from %s", network_file);
3011 goto network_file_fail;
3012 }
3013 *suffix = '\0';
3014
3015 r = network_get_by_name(link->manager, basename(network_file), &network);
3016 if (r < 0) {
3017 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3018 goto network_file_fail;
3019 }
3020
3021 r = network_apply(network, link);
3022 if (r < 0)
3023 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3024 }
3025
3026 network_file_fail:
3027
3028 if (addresses) {
3029 p = addresses;
3030
3031 for (;;) {
3032 _cleanup_free_ char *address_str = NULL;
3033 char *prefixlen_str;
3034 int family;
3035 unsigned char prefixlen;
3036
3037 r = extract_first_word(&p, &address_str, NULL, 0);
3038 if (r < 0) {
3039 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3040 continue;
3041 }
3042 if (r == 0)
3043 break;
3044
3045 prefixlen_str = strchr(address_str, '/');
3046 if (!prefixlen_str) {
3047 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3048 continue;
3049 }
3050
3051 *prefixlen_str++ = '\0';
3052
3053 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3054 if (r != 1) {
3055 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3056 continue;
3057 }
3058
3059 r = in_addr_from_string_auto(address_str, &family, &address);
3060 if (r < 0) {
3061 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3062 continue;
3063 }
3064
3065 r = address_add(link, family, &address, prefixlen, NULL);
3066 if (r < 0)
3067 return log_link_error_errno(link, r, "Failed to add address: %m");
3068 }
3069 }
3070
3071 if (routes) {
3072 p = routes;
3073
3074 for (;;) {
3075 Route *route;
3076 _cleanup_free_ char *route_str = NULL;
3077 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3078 usec_t lifetime;
3079 char *prefixlen_str;
3080 int family;
3081 unsigned char prefixlen, tos, table;
3082 uint32_t priority;
3083
3084 r = extract_first_word(&p, &route_str, NULL, 0);
3085 if (r < 0) {
3086 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3087 continue;
3088 }
3089 if (r == 0)
3090 break;
3091
3092 prefixlen_str = strchr(route_str, '/');
3093 if (!prefixlen_str) {
3094 log_link_debug(link, "Failed to parse route %s", route_str);
3095 continue;
3096 }
3097
3098 *prefixlen_str++ = '\0';
3099
3100 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3101 if (r != 5) {
3102 log_link_debug(link,
3103 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3104 prefixlen_str);
3105 continue;
3106 }
3107
3108 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3109 if (r < 0) {
3110 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3111 continue;
3112 }
3113
3114 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3115 if (r < 0)
3116 return log_link_error_errno(link, r, "Failed to add route: %m");
3117
3118 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3119 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3120 0, route_expire_handler, route);
3121 if (r < 0)
3122 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3123 }
3124
3125 route->lifetime = lifetime;
3126 sd_event_source_unref(route->expire);
3127 route->expire = TAKE_PTR(expire);
3128 }
3129 }
3130
3131 if (dhcp4_address) {
3132 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3133 if (r < 0) {
3134 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3135 goto dhcp4_address_fail;
3136 }
3137
3138 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3139 if (r < 0)
3140 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3141
3142 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3143 if (r < 0)
3144 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3145 }
3146
3147 dhcp4_address_fail:
3148
3149 if (ipv4ll_address) {
3150 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3151 if (r < 0) {
3152 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3153 goto ipv4ll_address_fail;
3154 }
3155
3156 r = sd_ipv4ll_new(&link->ipv4ll);
3157 if (r < 0)
3158 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3159
3160 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3161 if (r < 0)
3162 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3163 }
3164
3165 ipv4ll_address_fail:
3166
3167 return 0;
3168 }
3169
3170 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3171 Link *link;
3172 _cleanup_(udev_device_unrefp) struct udev_device *device = NULL;
3173 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3174 int r;
3175
3176 assert(m);
3177 assert(m->rtnl);
3178 assert(message);
3179 assert(ret);
3180
3181 r = link_new(m, message, ret);
3182 if (r < 0)
3183 return r;
3184
3185 link = *ret;
3186
3187 log_link_debug(link, "Link %d added", link->ifindex);
3188
3189 r = link_load(link);
3190 if (r < 0)
3191 return r;
3192
3193 if (detect_container() <= 0) {
3194 /* not in a container, udev will be around */
3195 sprintf(ifindex_str, "n%d", link->ifindex);
3196 device = udev_device_new_from_device_id(m->udev, ifindex_str);
3197 if (!device) {
3198 r = log_link_warning_errno(link, errno, "Could not find udev device: %m");
3199 goto failed;
3200 }
3201
3202 if (udev_device_get_is_initialized(device) <= 0) {
3203 /* not yet ready */
3204 log_link_debug(link, "link pending udev initialization...");
3205 return 0;
3206 }
3207
3208 r = link_initialized(link, device);
3209 if (r < 0)
3210 goto failed;
3211 } else {
3212 /* we are calling a callback directly, so must take a ref */
3213 link_ref(link);
3214
3215 r = link_initialized_and_synced(m->rtnl, NULL, link);
3216 if (r < 0)
3217 goto failed;
3218 }
3219
3220 return 0;
3221 failed:
3222 link_enter_failed(link);
3223 return r;
3224 }
3225
3226 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3227 int r;
3228
3229 assert(link);
3230
3231 log_link_info(link, "Gained IPv6LL");
3232
3233 link->ipv6ll_address = *address;
3234 link_check_ready(link);
3235
3236 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3237 r = link_acquire_ipv6_conf(link);
3238 if (r < 0) {
3239 link_enter_failed(link);
3240 return r;
3241 }
3242 }
3243
3244 return 0;
3245 }
3246
3247 static int link_carrier_gained(Link *link) {
3248 int r;
3249
3250 assert(link);
3251
3252 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3253 r = link_acquire_conf(link);
3254 if (r < 0) {
3255 link_enter_failed(link);
3256 return r;
3257 }
3258
3259 r = link_enter_set_addresses(link);
3260 if (r < 0)
3261 return r;
3262 }
3263
3264 r = link_handle_bound_by_list(link);
3265 if (r < 0)
3266 return r;
3267
3268 return 0;
3269 }
3270
3271 static int link_carrier_lost(Link *link) {
3272 int r;
3273
3274 assert(link);
3275
3276 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3277 setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3278 configuration and stop the clients as well. */
3279 if (link->setting_mtu)
3280 return 0;
3281
3282 r = link_stop_clients(link);
3283 if (r < 0) {
3284 link_enter_failed(link);
3285 return r;
3286 }
3287
3288 if (link_dhcp4_server_enabled(link))
3289 (void) sd_dhcp_server_stop(link->dhcp_server);
3290
3291 r = link_drop_config(link);
3292 if (r < 0)
3293 return r;
3294
3295 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3296 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3297 r = link_drop_foreign_config(link);
3298 if (r < 0)
3299 return r;
3300 }
3301
3302 r = link_handle_bound_by_list(link);
3303 if (r < 0)
3304 return r;
3305
3306 return 0;
3307 }
3308
3309 int link_carrier_reset(Link *link) {
3310 int r;
3311
3312 assert(link);
3313
3314 if (link_has_carrier(link)) {
3315 r = link_carrier_lost(link);
3316 if (r < 0)
3317 return r;
3318
3319 r = link_carrier_gained(link);
3320 if (r < 0)
3321 return r;
3322
3323 log_link_info(link, "Reset carrier");
3324 }
3325
3326 return 0;
3327 }
3328
3329 int link_update(Link *link, sd_netlink_message *m) {
3330 struct ether_addr mac;
3331 const char *ifname;
3332 uint32_t mtu;
3333 bool had_carrier, carrier_gained, carrier_lost;
3334 int r;
3335
3336 assert(link);
3337 assert(link->ifname);
3338 assert(m);
3339
3340 if (link->state == LINK_STATE_LINGER) {
3341 link_ref(link);
3342 log_link_info(link, "Link readded");
3343 link_set_state(link, LINK_STATE_ENSLAVING);
3344
3345 r = link_new_carrier_maps(link);
3346 if (r < 0)
3347 return r;
3348 }
3349
3350 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3351 if (r >= 0 && !streq(ifname, link->ifname)) {
3352 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3353
3354 if (link->state == LINK_STATE_PENDING) {
3355 r = free_and_strdup(&link->ifname, ifname);
3356 if (r < 0)
3357 return r;
3358 } else {
3359 Manager *manager = link->manager;
3360
3361 link_drop(link);
3362 r = link_add(manager, m, &link);
3363 if (r < 0)
3364 return r;
3365 }
3366 }
3367
3368 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3369 if (r >= 0 && mtu > 0) {
3370 link->mtu = mtu;
3371 if (link->original_mtu == 0) {
3372 link->original_mtu = mtu;
3373 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3374 }
3375
3376 if (link->dhcp_client) {
3377 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3378 link->mtu);
3379 if (r < 0) {
3380 log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3381 return r;
3382 }
3383 }
3384
3385 if (link->radv) {
3386 r = sd_radv_set_mtu(link->radv, link->mtu);
3387 if (r < 0)
3388 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3389 }
3390 }
3391
3392 /* The kernel may broadcast NEWLINK messages without the MAC address
3393 set, simply ignore them. */
3394 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3395 if (r >= 0) {
3396 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3397 ETH_ALEN)) {
3398
3399 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3400 ETH_ALEN);
3401
3402 log_link_debug(link, "MAC address: "
3403 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3404 mac.ether_addr_octet[0],
3405 mac.ether_addr_octet[1],
3406 mac.ether_addr_octet[2],
3407 mac.ether_addr_octet[3],
3408 mac.ether_addr_octet[4],
3409 mac.ether_addr_octet[5]);
3410
3411 if (link->ipv4ll) {
3412 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3413 if (r < 0)
3414 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3415 }
3416
3417 if (link->dhcp_client) {
3418 r = sd_dhcp_client_set_mac(link->dhcp_client,
3419 (const uint8_t *) &link->mac,
3420 sizeof (link->mac),
3421 ARPHRD_ETHER);
3422 if (r < 0)
3423 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3424
3425 switch (link->network->dhcp_client_identifier) {
3426 case DHCP_CLIENT_ID_DUID: {
3427 const DUID *duid = link_duid(link);
3428
3429 r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
3430 link->network->iaid,
3431 duid->type,
3432 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3433 duid->raw_data_len);
3434 if (r < 0)
3435 return log_link_warning_errno(link, r, "Could not update DUID/IAID in DHCP client: %m");
3436 break;
3437 }
3438 case DHCP_CLIENT_ID_DUID_ONLY: {
3439 const DUID *duid = link_duid(link);
3440
3441 r = sd_dhcp_client_set_duid(link->dhcp_client,
3442 duid->type,
3443 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3444 duid->raw_data_len);
3445 if (r < 0)
3446 return log_link_warning_errno(link, r, "Could not update DUID in DHCP client: %m");
3447 break;
3448 }
3449 case DHCP_CLIENT_ID_MAC:
3450 r = sd_dhcp_client_set_client_id(link->dhcp_client,
3451 ARPHRD_ETHER,
3452 (const uint8_t *)&link->mac,
3453 sizeof(link->mac));
3454 if (r < 0)
3455 return log_link_warning_errno(link, r, "Could not update MAC client id in DHCP client: %m");
3456 break;
3457 default:
3458 assert_not_reached("Unknown client identifier type.");
3459 }
3460 }
3461
3462 if (link->dhcp6_client) {
3463 const DUID* duid = link_duid(link);
3464
3465 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3466 (const uint8_t *) &link->mac,
3467 sizeof (link->mac),
3468 ARPHRD_ETHER);
3469 if (r < 0)
3470 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3471
3472 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3473 link->network->iaid);
3474 if (r < 0)
3475 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3476
3477 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3478 duid->type,
3479 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3480 duid->raw_data_len);
3481 if (r < 0)
3482 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3483 }
3484
3485 if (link->radv) {
3486 r = sd_radv_set_mac(link->radv, &link->mac);
3487 if (r < 0)
3488 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3489 }
3490
3491 if (link->ndisc) {
3492 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3493 if (r < 0)
3494 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3495 }
3496 }
3497 }
3498
3499 had_carrier = link_has_carrier(link);
3500
3501 r = link_update_flags(link, m);
3502 if (r < 0)
3503 return r;
3504
3505 r = link_update_lldp(link);
3506 if (r < 0)
3507 return r;
3508
3509 carrier_gained = !had_carrier && link_has_carrier(link);
3510 carrier_lost = had_carrier && !link_has_carrier(link);
3511
3512 if (carrier_gained) {
3513 log_link_info(link, "Gained carrier");
3514
3515 r = link_carrier_gained(link);
3516 if (r < 0)
3517 return r;
3518 } else if (carrier_lost) {
3519 log_link_info(link, "Lost carrier");
3520
3521 r = link_carrier_lost(link);
3522 if (r < 0)
3523 return r;
3524 }
3525
3526 return 0;
3527 }
3528
3529 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3530 bool space = false;
3531 Iterator i;
3532 Link *link;
3533
3534 assert(f);
3535 assert(prefix);
3536
3537 if (hashmap_isempty(h))
3538 return;
3539
3540 fputs(prefix, f);
3541 HASHMAP_FOREACH(link, h, i) {
3542 if (space)
3543 fputc(' ', f);
3544
3545 fprintf(f, "%i", link->ifindex);
3546 space = true;
3547 }
3548
3549 fputc('\n', f);
3550 }
3551
3552 int link_save(Link *link) {
3553 _cleanup_free_ char *temp_path = NULL;
3554 _cleanup_fclose_ FILE *f = NULL;
3555 const char *admin_state, *oper_state;
3556 Address *a;
3557 Route *route;
3558 Iterator i;
3559 int r;
3560
3561 assert(link);
3562 assert(link->state_file);
3563 assert(link->lease_file);
3564 assert(link->manager);
3565
3566 if (link->state == LINK_STATE_LINGER) {
3567 unlink(link->state_file);
3568 return 0;
3569 }
3570
3571 link_lldp_save(link);
3572
3573 admin_state = link_state_to_string(link->state);
3574 assert(admin_state);
3575
3576 oper_state = link_operstate_to_string(link->operstate);
3577 assert(oper_state);
3578
3579 r = fopen_temporary(link->state_file, &f, &temp_path);
3580 if (r < 0)
3581 goto fail;
3582
3583 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
3584 (void) fchmod(fileno(f), 0644);
3585
3586 fprintf(f,
3587 "# This is private data. Do not parse.\n"
3588 "ADMIN_STATE=%s\n"
3589 "OPER_STATE=%s\n",
3590 admin_state, oper_state);
3591
3592 if (link->network) {
3593 bool space;
3594 sd_dhcp6_lease *dhcp6_lease = NULL;
3595 const char *dhcp_domainname = NULL;
3596 char **dhcp6_domains = NULL;
3597 char **dhcp_domains = NULL;
3598 unsigned j;
3599
3600 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3601 yes_no(link->network->required_for_online));
3602
3603 if (link->dhcp6_client) {
3604 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3605 if (r < 0 && r != -ENOMSG)
3606 log_link_debug(link, "No DHCPv6 lease");
3607 }
3608
3609 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3610
3611 fputs("DNS=", f);
3612 space = false;
3613
3614 for (j = 0; j < link->network->n_dns; j++) {
3615 _cleanup_free_ char *b = NULL;
3616
3617 r = in_addr_to_string(link->network->dns[j].family,
3618 &link->network->dns[j].address, &b);
3619 if (r < 0) {
3620 log_debug_errno(r, "Failed to format address, ignoring: %m");
3621 continue;
3622 }
3623
3624 if (space)
3625 fputc(' ', f);
3626 fputs(b, f);
3627 space = true;
3628 }
3629
3630 if (link->network->dhcp_use_dns &&
3631 link->dhcp_lease) {
3632 const struct in_addr *addresses;
3633
3634 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3635 if (r > 0) {
3636 if (space)
3637 fputc(' ', f);
3638 serialize_in_addrs(f, addresses, r);
3639 space = true;
3640 }
3641 }
3642
3643 if (link->network->dhcp_use_dns && dhcp6_lease) {
3644 struct in6_addr *in6_addrs;
3645
3646 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3647 if (r > 0) {
3648 if (space)
3649 fputc(' ', f);
3650 serialize_in6_addrs(f, in6_addrs, r);
3651 space = true;
3652 }
3653 }
3654
3655 /* Make sure to flush out old entries before we use the NDISC data */
3656 ndisc_vacuum(link);
3657
3658 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3659 NDiscRDNSS *dd;
3660
3661 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3662 if (space)
3663 fputc(' ', f);
3664
3665 serialize_in6_addrs(f, &dd->address, 1);
3666 space = true;
3667 }
3668 }
3669
3670 fputc('\n', f);
3671
3672 fputs("NTP=", f);
3673 space = false;
3674 fputstrv(f, link->network->ntp, NULL, &space);
3675
3676 if (link->network->dhcp_use_ntp &&
3677 link->dhcp_lease) {
3678 const struct in_addr *addresses;
3679
3680 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3681 if (r > 0) {
3682 if (space)
3683 fputc(' ', f);
3684 serialize_in_addrs(f, addresses, r);
3685 space = true;
3686 }
3687 }
3688
3689 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3690 struct in6_addr *in6_addrs;
3691 char **hosts;
3692
3693 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3694 &in6_addrs);
3695 if (r > 0) {
3696 if (space)
3697 fputc(' ', f);
3698 serialize_in6_addrs(f, in6_addrs, r);
3699 space = true;
3700 }
3701
3702 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3703 if (r > 0)
3704 fputstrv(f, hosts, NULL, &space);
3705 }
3706
3707 fputc('\n', f);
3708
3709 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3710 if (link->dhcp_lease) {
3711 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3712 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3713 }
3714 if (dhcp6_lease)
3715 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3716 }
3717
3718 fputs("DOMAINS=", f);
3719 space = false;
3720 fputstrv(f, link->network->search_domains, NULL, &space);
3721
3722 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3723 NDiscDNSSL *dd;
3724
3725 if (dhcp_domainname)
3726 fputs_with_space(f, dhcp_domainname, NULL, &space);
3727 if (dhcp_domains)
3728 fputstrv(f, dhcp_domains, NULL, &space);
3729 if (dhcp6_domains)
3730 fputstrv(f, dhcp6_domains, NULL, &space);
3731
3732 SET_FOREACH(dd, link->ndisc_dnssl, i)
3733 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3734 }
3735
3736 fputc('\n', f);
3737
3738 fputs("ROUTE_DOMAINS=", f);
3739 space = false;
3740 fputstrv(f, link->network->route_domains, NULL, &space);
3741
3742 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3743 NDiscDNSSL *dd;
3744
3745 if (dhcp_domainname)
3746 fputs_with_space(f, dhcp_domainname, NULL, &space);
3747 if (dhcp_domains)
3748 fputstrv(f, dhcp_domains, NULL, &space);
3749 if (dhcp6_domains)
3750 fputstrv(f, dhcp6_domains, NULL, &space);
3751
3752 SET_FOREACH(dd, link->ndisc_dnssl, i)
3753 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3754 }
3755
3756 fputc('\n', f);
3757
3758 fprintf(f, "LLMNR=%s\n",
3759 resolve_support_to_string(link->network->llmnr));
3760 fprintf(f, "MDNS=%s\n",
3761 resolve_support_to_string(link->network->mdns));
3762
3763 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3764 fprintf(f, "DNS_OVER_TLS=%s\n",
3765 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
3766
3767 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3768 fprintf(f, "DNSSEC=%s\n",
3769 dnssec_mode_to_string(link->network->dnssec_mode));
3770
3771 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3772 const char *n;
3773
3774 fputs("DNSSEC_NTA=", f);
3775 space = false;
3776 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3777 fputs_with_space(f, n, NULL, &space);
3778 fputc('\n', f);
3779 }
3780
3781 fputs("ADDRESSES=", f);
3782 space = false;
3783 SET_FOREACH(a, link->addresses, i) {
3784 _cleanup_free_ char *address_str = NULL;
3785
3786 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3787 if (r < 0)
3788 goto fail;
3789
3790 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3791 space = true;
3792 }
3793 fputc('\n', f);
3794
3795 fputs("ROUTES=", f);
3796 space = false;
3797 SET_FOREACH(route, link->routes, i) {
3798 _cleanup_free_ char *route_str = NULL;
3799
3800 r = in_addr_to_string(route->family, &route->dst, &route_str);
3801 if (r < 0)
3802 goto fail;
3803
3804 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
3805 space ? " " : "", route_str,
3806 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3807 space = true;
3808 }
3809
3810 fputc('\n', f);
3811 }
3812
3813 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3814 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3815
3816 if (link->dhcp_lease) {
3817 struct in_addr address;
3818 const char *tz = NULL;
3819
3820 assert(link->network);
3821
3822 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3823 if (r >= 0)
3824 fprintf(f, "TIMEZONE=%s\n", tz);
3825
3826 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3827 if (r >= 0) {
3828 fputs("DHCP4_ADDRESS=", f);
3829 serialize_in_addrs(f, &address, 1);
3830 fputc('\n', f);
3831 }
3832
3833 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3834 if (r < 0)
3835 goto fail;
3836
3837 fprintf(f,
3838 "DHCP_LEASE=%s\n",
3839 link->lease_file);
3840 } else
3841 unlink(link->lease_file);
3842
3843 if (link->ipv4ll) {
3844 struct in_addr address;
3845
3846 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3847 if (r >= 0) {
3848 fputs("IPV4LL_ADDRESS=", f);
3849 serialize_in_addrs(f, &address, 1);
3850 fputc('\n', f);
3851 }
3852 }
3853
3854 r = fflush_and_check(f);
3855 if (r < 0)
3856 goto fail;
3857
3858 if (rename(temp_path, link->state_file) < 0) {
3859 r = -errno;
3860 goto fail;
3861 }
3862
3863 return 0;
3864
3865 fail:
3866 (void) unlink(link->state_file);
3867 if (temp_path)
3868 (void) unlink(temp_path);
3869
3870 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3871 }
3872
3873 /* The serialized state in /run is no longer up-to-date. */
3874 void link_dirty(Link *link) {
3875 int r;
3876
3877 assert(link);
3878
3879 /* mark manager dirty as link is dirty */
3880 manager_dirty(link->manager);
3881
3882 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3883 if (r < 0)
3884 /* allocation errors are ignored */
3885 return;
3886
3887 r = set_put(link->manager->dirty_links, link);
3888 if (r <= 0)
3889 /* don't take another ref if the link was already dirty */
3890 return;
3891
3892 link_ref(link);
3893 }
3894
3895 /* The serialized state in /run is up-to-date */
3896 void link_clean(Link *link) {
3897 assert(link);
3898 assert(link->manager);
3899
3900 set_remove(link->manager->dirty_links, link);
3901 link_unref(link);
3902 }
3903
3904 static const char* const link_state_table[_LINK_STATE_MAX] = {
3905 [LINK_STATE_PENDING] = "pending",
3906 [LINK_STATE_ENSLAVING] = "configuring",
3907 [LINK_STATE_SETTING_ADDRESSES] = "configuring",
3908 [LINK_STATE_SETTING_ROUTES] = "configuring",
3909 [LINK_STATE_CONFIGURED] = "configured",
3910 [LINK_STATE_UNMANAGED] = "unmanaged",
3911 [LINK_STATE_FAILED] = "failed",
3912 [LINK_STATE_LINGER] = "linger",
3913 };
3914
3915 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
3916
3917 static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
3918 [LINK_OPERSTATE_OFF] = "off",
3919 [LINK_OPERSTATE_NO_CARRIER] = "no-carrier",
3920 [LINK_OPERSTATE_DORMANT] = "dormant",
3921 [LINK_OPERSTATE_CARRIER] = "carrier",
3922 [LINK_OPERSTATE_DEGRADED] = "degraded",
3923 [LINK_OPERSTATE_ROUTABLE] = "routable",
3924 };
3925
3926 DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
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