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[thirdparty/systemd.git] / src / network / networkd-link.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <netinet/ether.h>
4 #include <linux/if.h>
5 #include <linux/can/netlink.h>
6 #include <unistd.h>
7 #include <stdio_ext.h>
8
9 #include "alloc-util.h"
10 #include "bus-util.h"
11 #include "dhcp-lease-internal.h"
12 #include "fd-util.h"
13 #include "fileio.h"
14 #include "netlink-util.h"
15 #include "network-internal.h"
16 #include "networkd-ipv6-proxy-ndp.h"
17 #include "networkd-lldp-tx.h"
18 #include "networkd-manager.h"
19 #include "networkd-ndisc.h"
20 #include "networkd-radv.h"
21 #include "networkd-routing-policy-rule.h"
22 #include "set.h"
23 #include "socket-util.h"
24 #include "stdio-util.h"
25 #include "string-table.h"
26 #include "udev-util.h"
27 #include "util.h"
28 #include "virt.h"
29
30 static bool link_dhcp6_enabled(Link *link) {
31 assert(link);
32
33 if (!socket_ipv6_is_supported())
34 return false;
35
36 if (link->flags & IFF_LOOPBACK)
37 return false;
38
39 if (!link->network)
40 return false;
41
42 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
43 }
44
45 static bool link_dhcp4_enabled(Link *link) {
46 assert(link);
47
48 if (link->flags & IFF_LOOPBACK)
49 return false;
50
51 if (!link->network)
52 return false;
53
54 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
55 }
56
57 static bool link_dhcp4_server_enabled(Link *link) {
58 assert(link);
59
60 if (link->flags & IFF_LOOPBACK)
61 return false;
62
63 if (!link->network)
64 return false;
65
66 return link->network->dhcp_server;
67 }
68
69 static bool link_ipv4ll_enabled(Link *link) {
70 assert(link);
71
72 if (link->flags & IFF_LOOPBACK)
73 return false;
74
75 if (!link->network)
76 return false;
77
78 if (streq_ptr(link->kind, "wireguard"))
79 return false;
80
81 return link->network->link_local & ADDRESS_FAMILY_IPV4;
82 }
83
84 static bool link_ipv6ll_enabled(Link *link) {
85 assert(link);
86
87 if (!socket_ipv6_is_supported())
88 return false;
89
90 if (link->flags & IFF_LOOPBACK)
91 return false;
92
93 if (!link->network)
94 return false;
95
96 if (streq_ptr(link->kind, "wireguard"))
97 return false;
98
99 return link->network->link_local & ADDRESS_FAMILY_IPV6;
100 }
101
102 static bool link_ipv6_enabled(Link *link) {
103 assert(link);
104
105 if (!socket_ipv6_is_supported())
106 return false;
107
108 if (link->network->bridge)
109 return false;
110
111 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
112 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
113 }
114
115 static bool link_radv_enabled(Link *link) {
116 assert(link);
117
118 if (!link_ipv6ll_enabled(link))
119 return false;
120
121 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
122 }
123
124 static bool link_lldp_rx_enabled(Link *link) {
125 assert(link);
126
127 if (link->flags & IFF_LOOPBACK)
128 return false;
129
130 if (link->iftype != ARPHRD_ETHER)
131 return false;
132
133 if (!link->network)
134 return false;
135
136 /* LLDP should be handled on bridge slaves as those have a direct
137 * connection to their peers not on the bridge master. Linux doesn't
138 * even (by default) forward lldp packets to the bridge master.*/
139 if (streq_ptr("bridge", link->kind))
140 return false;
141
142 return link->network->lldp_mode != LLDP_MODE_NO;
143 }
144
145 static bool link_lldp_emit_enabled(Link *link) {
146 assert(link);
147
148 if (link->flags & IFF_LOOPBACK)
149 return false;
150
151 if (link->iftype != ARPHRD_ETHER)
152 return false;
153
154 if (!link->network)
155 return false;
156
157 return link->network->lldp_emit != LLDP_EMIT_NO;
158 }
159
160 static bool link_ipv4_forward_enabled(Link *link) {
161 assert(link);
162
163 if (link->flags & IFF_LOOPBACK)
164 return false;
165
166 if (!link->network)
167 return false;
168
169 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
170 return false;
171
172 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
173 }
174
175 static bool link_ipv6_forward_enabled(Link *link) {
176 assert(link);
177
178 if (!socket_ipv6_is_supported())
179 return false;
180
181 if (link->flags & IFF_LOOPBACK)
182 return false;
183
184 if (!link->network)
185 return false;
186
187 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
188 return false;
189
190 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
191 }
192
193 static bool link_proxy_arp_enabled(Link *link) {
194 assert(link);
195
196 if (link->flags & IFF_LOOPBACK)
197 return false;
198
199 if (!link->network)
200 return false;
201
202 if (link->network->proxy_arp < 0)
203 return false;
204
205 return true;
206 }
207
208 static bool link_ipv6_accept_ra_enabled(Link *link) {
209 assert(link);
210
211 if (!socket_ipv6_is_supported())
212 return false;
213
214 if (link->flags & IFF_LOOPBACK)
215 return false;
216
217 if (!link->network)
218 return false;
219
220 if (!link_ipv6ll_enabled(link))
221 return false;
222
223 /* If unset use system default (enabled if local forwarding is disabled.
224 * disabled if local forwarding is enabled).
225 * If set, ignore or enforce RA independent of local forwarding state.
226 */
227 if (link->network->ipv6_accept_ra < 0)
228 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
229 return !link_ipv6_forward_enabled(link);
230 else if (link->network->ipv6_accept_ra > 0)
231 /* accept RA even if ip_forward is enabled */
232 return true;
233 else
234 /* ignore RA */
235 return false;
236 }
237
238 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
239 assert(link);
240
241 if (!socket_ipv6_is_supported())
242 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
243
244 if (link->flags & IFF_LOOPBACK)
245 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
246
247 if (!link->network)
248 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
249
250 return link->network->ipv6_privacy_extensions;
251 }
252
253 static int link_enable_ipv6(Link *link) {
254 const char *p = NULL;
255 bool disabled;
256 int r;
257
258 if (link->flags & IFF_LOOPBACK)
259 return 0;
260
261 disabled = !link_ipv6_enabled(link);
262
263 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/disable_ipv6");
264
265 r = write_string_file(p, one_zero(disabled), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
266 if (r < 0)
267 log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m",
268 enable_disable(!disabled), link->ifname);
269 else
270 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
271
272 return 0;
273 }
274
275 void link_update_operstate(Link *link) {
276 LinkOperationalState operstate;
277 assert(link);
278
279 if (link->kernel_operstate == IF_OPER_DORMANT)
280 operstate = LINK_OPERSTATE_DORMANT;
281 else if (link_has_carrier(link)) {
282 Address *address;
283 uint8_t scope = RT_SCOPE_NOWHERE;
284 Iterator i;
285
286 /* if we have carrier, check what addresses we have */
287 SET_FOREACH(address, link->addresses, i) {
288 if (!address_is_ready(address))
289 continue;
290
291 if (address->scope < scope)
292 scope = address->scope;
293 }
294
295 /* for operstate we also take foreign addresses into account */
296 SET_FOREACH(address, link->addresses_foreign, i) {
297 if (!address_is_ready(address))
298 continue;
299
300 if (address->scope < scope)
301 scope = address->scope;
302 }
303
304 if (scope < RT_SCOPE_SITE)
305 /* universally accessible addresses found */
306 operstate = LINK_OPERSTATE_ROUTABLE;
307 else if (scope < RT_SCOPE_HOST)
308 /* only link or site local addresses found */
309 operstate = LINK_OPERSTATE_DEGRADED;
310 else
311 /* no useful addresses found */
312 operstate = LINK_OPERSTATE_CARRIER;
313 } else if (link->flags & IFF_UP)
314 operstate = LINK_OPERSTATE_NO_CARRIER;
315 else
316 operstate = LINK_OPERSTATE_OFF;
317
318 if (link->operstate != operstate) {
319 link->operstate = operstate;
320 link_send_changed(link, "OperationalState", NULL);
321 link_dirty(link);
322 }
323 }
324
325 #define FLAG_STRING(string, flag, old, new) \
326 (((old ^ new) & flag) \
327 ? ((old & flag) ? (" -" string) : (" +" string)) \
328 : "")
329
330 static int link_update_flags(Link *link, sd_netlink_message *m) {
331 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
332 uint8_t operstate;
333 int r;
334
335 assert(link);
336
337 r = sd_rtnl_message_link_get_flags(m, &flags);
338 if (r < 0)
339 return log_link_warning_errno(link, r, "Could not get link flags: %m");
340
341 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
342 if (r < 0)
343 /* if we got a message without operstate, take it to mean
344 the state was unchanged */
345 operstate = link->kernel_operstate;
346
347 if ((link->flags == flags) && (link->kernel_operstate == operstate))
348 return 0;
349
350 if (link->flags != flags) {
351 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",
352 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
353 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
354 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
355 FLAG_STRING("UP", IFF_UP, link->flags, flags),
356 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
357 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
358 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
359 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
360 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
361 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
362 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
363 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
364 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
365 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
366 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
367 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
368 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
369 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
370 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
371
372 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
373 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
374 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
375 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
376 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
377 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
378 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
379 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
380
381 /* link flags are currently at most 18 bits, let's align to
382 * printing 20 */
383 if (unknown_flags_added)
384 log_link_debug(link,
385 "Unknown link flags gained: %#.5x (ignoring)",
386 unknown_flags_added);
387
388 if (unknown_flags_removed)
389 log_link_debug(link,
390 "Unknown link flags lost: %#.5x (ignoring)",
391 unknown_flags_removed);
392 }
393
394 link->flags = flags;
395 link->kernel_operstate = operstate;
396
397 link_update_operstate(link);
398
399 return 0;
400 }
401
402 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
403 _cleanup_(link_unrefp) Link *link = NULL;
404 uint16_t type;
405 const char *ifname, *kind = NULL;
406 int r, ifindex;
407 unsigned short iftype;
408
409 assert(manager);
410 assert(message);
411 assert(ret);
412
413 /* check for link kind */
414 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
415 if (r == 0) {
416 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
417 r = sd_netlink_message_exit_container(message);
418 if (r < 0)
419 return r;
420 }
421
422 r = sd_netlink_message_get_type(message, &type);
423 if (r < 0)
424 return r;
425 else if (type != RTM_NEWLINK)
426 return -EINVAL;
427
428 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
429 if (r < 0)
430 return r;
431 else if (ifindex <= 0)
432 return -EINVAL;
433
434 r = sd_rtnl_message_link_get_type(message, &iftype);
435 if (r < 0)
436 return r;
437
438 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
439 if (r < 0)
440 return r;
441
442 link = new0(Link, 1);
443 if (!link)
444 return -ENOMEM;
445
446 link->n_ref = 1;
447 link->manager = manager;
448 link->state = LINK_STATE_PENDING;
449 link->rtnl_extended_attrs = true;
450 link->ifindex = ifindex;
451 link->iftype = iftype;
452 link->ifname = strdup(ifname);
453 if (!link->ifname)
454 return -ENOMEM;
455
456 if (kind) {
457 link->kind = strdup(kind);
458 if (!link->kind)
459 return -ENOMEM;
460 }
461
462 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
463 if (r < 0)
464 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
465
466 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
467 return -ENOMEM;
468
469 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
470 return -ENOMEM;
471
472 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
473 return -ENOMEM;
474
475 r = hashmap_ensure_allocated(&manager->links, NULL);
476 if (r < 0)
477 return r;
478
479 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
480 if (r < 0)
481 return r;
482
483 r = link_update_flags(link, message);
484 if (r < 0)
485 return r;
486
487 *ret = TAKE_PTR(link);
488
489 return 0;
490 }
491
492 static void link_free(Link *link) {
493 Address *address;
494 Link *carrier;
495 Route *route;
496 Iterator i;
497
498 if (!link)
499 return;
500
501 while ((route = set_first(link->routes)))
502 route_free(route);
503
504 while ((route = set_first(link->routes_foreign)))
505 route_free(route);
506
507 link->routes = set_free(link->routes);
508 link->routes_foreign = set_free(link->routes_foreign);
509
510 while ((address = set_first(link->addresses)))
511 address_free(address);
512
513 while ((address = set_first(link->addresses_foreign)))
514 address_free(address);
515
516 link->addresses = set_free(link->addresses);
517 link->addresses_foreign = set_free(link->addresses_foreign);
518
519 while ((address = link->pool_addresses)) {
520 LIST_REMOVE(addresses, link->pool_addresses, address);
521 address_free(address);
522 }
523
524 sd_dhcp_server_unref(link->dhcp_server);
525 sd_dhcp_client_unref(link->dhcp_client);
526 sd_dhcp_lease_unref(link->dhcp_lease);
527
528 link_lldp_emit_stop(link);
529
530 free(link->lease_file);
531
532 sd_lldp_unref(link->lldp);
533 free(link->lldp_file);
534
535 ndisc_flush(link);
536
537 sd_ipv4ll_unref(link->ipv4ll);
538 sd_dhcp6_client_unref(link->dhcp6_client);
539 sd_ndisc_unref(link->ndisc);
540 sd_radv_unref(link->radv);
541
542 if (link->manager)
543 hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex));
544
545 free(link->ifname);
546
547 free(link->kind);
548
549 (void) unlink(link->state_file);
550 free(link->state_file);
551
552 udev_device_unref(link->udev_device);
553
554 HASHMAP_FOREACH (carrier, link->bound_to_links, i)
555 hashmap_remove(link->bound_to_links, INT_TO_PTR(carrier->ifindex));
556 hashmap_free(link->bound_to_links);
557
558 HASHMAP_FOREACH (carrier, link->bound_by_links, i)
559 hashmap_remove(link->bound_by_links, INT_TO_PTR(carrier->ifindex));
560 hashmap_free(link->bound_by_links);
561
562 free(link);
563 }
564
565 Link *link_unref(Link *link) {
566 if (!link)
567 return NULL;
568
569 assert(link->n_ref > 0);
570
571 link->n_ref--;
572
573 if (link->n_ref > 0)
574 return NULL;
575
576 link_free(link);
577
578 return NULL;
579 }
580
581 Link *link_ref(Link *link) {
582 if (!link)
583 return NULL;
584
585 assert(link->n_ref > 0);
586
587 link->n_ref++;
588
589 return link;
590 }
591
592 int link_get(Manager *m, int ifindex, Link **ret) {
593 Link *link;
594
595 assert(m);
596 assert(ifindex);
597 assert(ret);
598
599 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
600 if (!link)
601 return -ENODEV;
602
603 *ret = link;
604
605 return 0;
606 }
607
608 static void link_set_state(Link *link, LinkState state) {
609 assert(link);
610
611 if (link->state == state)
612 return;
613
614 link->state = state;
615
616 link_send_changed(link, "AdministrativeState", NULL);
617 }
618
619 static void link_enter_unmanaged(Link *link) {
620 assert(link);
621
622 log_link_debug(link, "Unmanaged");
623
624 link_set_state(link, LINK_STATE_UNMANAGED);
625
626 link_dirty(link);
627 }
628
629 static int link_stop_clients(Link *link) {
630 int r = 0, k;
631
632 assert(link);
633 assert(link->manager);
634 assert(link->manager->event);
635
636 if (link->dhcp_client) {
637 k = sd_dhcp_client_stop(link->dhcp_client);
638 if (k < 0)
639 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
640 }
641
642 if (link->ipv4ll) {
643 k = sd_ipv4ll_stop(link->ipv4ll);
644 if (k < 0)
645 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
646 }
647
648 if (link->dhcp6_client) {
649 k = sd_dhcp6_client_stop(link->dhcp6_client);
650 if (k < 0)
651 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
652 }
653
654 if (link->ndisc) {
655 k = sd_ndisc_stop(link->ndisc);
656 if (k < 0)
657 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
658 }
659
660 if (link->radv) {
661 k = sd_radv_stop(link->radv);
662 if (k < 0)
663 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
664 }
665
666 link_lldp_emit_stop(link);
667 return r;
668 }
669
670 void link_enter_failed(Link *link) {
671 assert(link);
672
673 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
674 return;
675
676 log_link_warning(link, "Failed");
677
678 link_set_state(link, LINK_STATE_FAILED);
679
680 link_stop_clients(link);
681
682 link_dirty(link);
683 }
684
685 static Address* link_find_dhcp_server_address(Link *link) {
686 Address *address;
687
688 assert(link);
689 assert(link->network);
690
691 /* The first statically configured address if there is any */
692 LIST_FOREACH(addresses, address, link->network->static_addresses) {
693
694 if (address->family != AF_INET)
695 continue;
696
697 if (in_addr_is_null(address->family, &address->in_addr))
698 continue;
699
700 return address;
701 }
702
703 /* If that didn't work, find a suitable address we got from the pool */
704 LIST_FOREACH(addresses, address, link->pool_addresses) {
705 if (address->family != AF_INET)
706 continue;
707
708 return address;
709 }
710
711 return NULL;
712 }
713
714 static void link_enter_configured(Link *link) {
715 assert(link);
716 assert(link->network);
717
718 if (link->state != LINK_STATE_SETTING_ROUTES)
719 return;
720
721 log_link_info(link, "Configured");
722
723 link_set_state(link, LINK_STATE_CONFIGURED);
724
725 link_dirty(link);
726 }
727
728 void link_check_ready(Link *link) {
729 Address *a;
730 Iterator i;
731
732 assert(link);
733
734 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
735 return;
736
737 if (!link->network)
738 return;
739
740 if (!link->static_routes_configured)
741 return;
742
743 if (!link->routing_policy_rules_configured)
744 return;
745
746 if (link_ipv4ll_enabled(link))
747 if (!link->ipv4ll_address ||
748 !link->ipv4ll_route)
749 return;
750
751 if (!link->network->bridge) {
752
753 if (link_ipv6ll_enabled(link))
754 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) > 0)
755 return;
756
757 if ((link_dhcp4_enabled(link) && !link_dhcp6_enabled(link) &&
758 !link->dhcp4_configured) ||
759 (link_dhcp6_enabled(link) && !link_dhcp4_enabled(link) &&
760 !link->dhcp6_configured) ||
761 (link_dhcp4_enabled(link) && link_dhcp6_enabled(link) &&
762 !link->dhcp4_configured && !link->dhcp6_configured))
763 return;
764
765 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
766 return;
767 }
768
769 SET_FOREACH(a, link->addresses, i)
770 if (!address_is_ready(a))
771 return;
772
773 if (link->state != LINK_STATE_CONFIGURED)
774 link_enter_configured(link);
775
776 return;
777 }
778
779 static int link_set_routing_policy_rule(Link *link) {
780 RoutingPolicyRule *rule, *rrule = NULL;
781 int r;
782
783 assert(link);
784 assert(link->network);
785
786 LIST_FOREACH(rules, rule, link->network->rules) {
787 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
788 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif, &rrule);
789 if (r == 1) {
790 (void) routing_policy_rule_make_local(link->manager, rrule);
791 continue;
792 }
793
794 r = routing_policy_rule_configure(rule, link, link_routing_policy_rule_handler, false);
795 if (r < 0) {
796 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
797 link_enter_failed(link);
798 return r;
799 }
800
801 link->routing_policy_rule_messages++;
802 }
803
804 routing_policy_rule_purge(link->manager, link);
805 if (link->routing_policy_rule_messages == 0) {
806 link->routing_policy_rules_configured = true;
807 link_check_ready(link);
808 } else
809 log_link_debug(link, "Setting routing policy rules");
810
811 return 0;
812 }
813
814 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
815 _cleanup_(link_unrefp) Link *link = userdata;
816 int r;
817
818 assert(link->route_messages > 0);
819 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
820 LINK_STATE_SETTING_ROUTES, LINK_STATE_FAILED,
821 LINK_STATE_LINGER));
822
823 link->route_messages--;
824
825 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
826 return 1;
827
828 r = sd_netlink_message_get_errno(m);
829 if (r < 0 && r != -EEXIST)
830 log_link_warning_errno(link, r, "Could not set route: %m");
831
832 if (link->route_messages == 0) {
833 log_link_debug(link, "Routes set");
834 link->static_routes_configured = true;
835 link_check_ready(link);
836 }
837
838 return 1;
839 }
840
841 static int link_enter_set_routes(Link *link) {
842 Route *rt;
843 int r;
844
845 assert(link);
846 assert(link->network);
847 assert(link->state == LINK_STATE_SETTING_ADDRESSES);
848
849 (void) link_set_routing_policy_rule(link);
850
851 link_set_state(link, LINK_STATE_SETTING_ROUTES);
852
853 LIST_FOREACH(routes, rt, link->network->static_routes) {
854 r = route_configure(rt, link, route_handler);
855 if (r < 0) {
856 log_link_warning_errno(link, r, "Could not set routes: %m");
857 link_enter_failed(link);
858 return r;
859 }
860
861 link->route_messages++;
862 }
863
864 if (link->route_messages == 0) {
865 link->static_routes_configured = true;
866 link_check_ready(link);
867 } else
868 log_link_debug(link, "Setting routes");
869
870 return 0;
871 }
872
873 int link_route_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
874 _cleanup_(link_unrefp) Link *link = userdata;
875 int r;
876
877 assert(m);
878 assert(link);
879 assert(link->ifname);
880
881 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
882 return 1;
883
884 r = sd_netlink_message_get_errno(m);
885 if (r < 0 && r != -ESRCH)
886 log_link_warning_errno(link, r, "Could not drop route: %m");
887
888 return 1;
889 }
890
891 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
892 _cleanup_(link_unrefp) Link *link = userdata;
893 int r;
894
895 assert(rtnl);
896 assert(m);
897 assert(link);
898 assert(link->ifname);
899 assert(link->address_messages > 0);
900 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
901 LINK_STATE_FAILED, LINK_STATE_LINGER));
902
903 link->address_messages--;
904
905 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
906 return 1;
907
908 r = sd_netlink_message_get_errno(m);
909 if (r < 0 && r != -EEXIST)
910 log_link_warning_errno(link, r, "could not set address: %m");
911 else if (r >= 0)
912 manager_rtnl_process_address(rtnl, m, link->manager);
913
914 if (link->address_messages == 0) {
915 log_link_debug(link, "Addresses set");
916 link_enter_set_routes(link);
917 }
918
919 return 1;
920 }
921
922 static int address_label_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
923 _cleanup_(link_unrefp) Link *link = userdata;
924 int r;
925
926 assert(rtnl);
927 assert(m);
928 assert(link);
929 assert(link->ifname);
930 assert(link->address_label_messages > 0);
931
932 link->address_label_messages--;
933
934 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
935 return 1;
936
937 r = sd_netlink_message_get_errno(m);
938 if (r < 0 && r != -EEXIST)
939 log_link_warning_errno(link, r, "could not set address label: %m");
940 else if (r >= 0)
941 manager_rtnl_process_address(rtnl, m, link->manager);
942
943 if (link->address_label_messages == 0)
944 log_link_debug(link, "Addresses label set");
945
946 return 1;
947 }
948
949 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
950 _cleanup_free_ struct in_addr *addresses = NULL;
951 size_t n_addresses = 0, n_allocated = 0;
952 unsigned i;
953
954 log_debug("Copying DNS server information from %s", link->ifname);
955
956 if (!link->network)
957 return 0;
958
959 for (i = 0; i < link->network->n_dns; i++) {
960 struct in_addr ia;
961
962 /* Only look for IPv4 addresses */
963 if (link->network->dns[i].family != AF_INET)
964 continue;
965
966 ia = link->network->dns[i].address.in;
967
968 /* Never propagate obviously borked data */
969 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
970 continue;
971
972 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
973 return log_oom();
974
975 addresses[n_addresses++] = ia;
976 }
977
978 if (link->network->dhcp_use_dns && link->dhcp_lease) {
979 const struct in_addr *da = NULL;
980 int n;
981
982 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
983 if (n > 0) {
984
985 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
986 return log_oom();
987
988 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
989 n_addresses += n;
990 }
991 }
992
993 if (n_addresses <= 0)
994 return 0;
995
996 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
997 }
998
999 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1000 _cleanup_free_ struct in_addr *addresses = NULL;
1001 size_t n_addresses = 0, n_allocated = 0;
1002 char **a;
1003
1004 if (!link->network)
1005 return 0;
1006
1007 log_debug("Copying NTP server information from %s", link->ifname);
1008
1009 STRV_FOREACH(a, link->network->ntp) {
1010 struct in_addr ia;
1011
1012 /* Only look for IPv4 addresses */
1013 if (inet_pton(AF_INET, *a, &ia) <= 0)
1014 continue;
1015
1016 /* Never propagate obviously borked data */
1017 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1018 continue;
1019
1020 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1021 return log_oom();
1022
1023 addresses[n_addresses++] = ia;
1024 }
1025
1026 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1027 const struct in_addr *da = NULL;
1028 int n;
1029
1030 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1031 if (n > 0) {
1032
1033 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1034 return log_oom();
1035
1036 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
1037 n_addresses += n;
1038 }
1039 }
1040
1041 if (n_addresses <= 0)
1042 return 0;
1043
1044 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1045 }
1046
1047 static int link_set_bridge_fdb(Link *link) {
1048 FdbEntry *fdb_entry;
1049 int r;
1050
1051 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1052 r = fdb_entry_configure(link, fdb_entry);
1053 if (r < 0)
1054 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1055 }
1056
1057 return 0;
1058 }
1059
1060 static int link_enter_set_addresses(Link *link) {
1061 AddressLabel *label;
1062 Address *ad;
1063 int r;
1064
1065 assert(link);
1066 assert(link->network);
1067 assert(link->state != _LINK_STATE_INVALID);
1068
1069 r = link_set_bridge_fdb(link);
1070 if (r < 0)
1071 return r;
1072
1073 link_set_state(link, LINK_STATE_SETTING_ADDRESSES);
1074
1075 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1076 r = address_configure(ad, link, address_handler, false);
1077 if (r < 0) {
1078 log_link_warning_errno(link, r, "Could not set addresses: %m");
1079 link_enter_failed(link);
1080 return r;
1081 }
1082
1083 link->address_messages++;
1084 }
1085
1086 LIST_FOREACH(labels, label, link->network->address_labels) {
1087 r = address_label_configure(label, link, address_label_handler, false);
1088 if (r < 0) {
1089 log_link_warning_errno(link, r, "Could not set address label: %m");
1090 link_enter_failed(link);
1091 return r;
1092 }
1093
1094 link->address_label_messages++;
1095 }
1096
1097 /* now that we can figure out a default address for the dhcp server,
1098 start it */
1099 if (link_dhcp4_server_enabled(link)) {
1100 Address *address;
1101 Link *uplink = NULL;
1102 bool acquired_uplink = false;
1103
1104 address = link_find_dhcp_server_address(link);
1105 if (!address) {
1106 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1107 link_enter_failed(link);
1108 return 0;
1109 }
1110
1111 /* use the server address' subnet as the pool */
1112 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1113 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1114 if (r < 0)
1115 return r;
1116
1117 /* TODO:
1118 r = sd_dhcp_server_set_router(link->dhcp_server,
1119 &main_address->in_addr.in);
1120 if (r < 0)
1121 return r;
1122 */
1123
1124 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1125 r = sd_dhcp_server_set_max_lease_time(
1126 link->dhcp_server,
1127 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1128 if (r < 0)
1129 return r;
1130 }
1131
1132 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1133 r = sd_dhcp_server_set_default_lease_time(
1134 link->dhcp_server,
1135 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1136 if (r < 0)
1137 return r;
1138 }
1139
1140 if (link->network->dhcp_server_emit_dns) {
1141
1142 if (link->network->n_dhcp_server_dns > 0)
1143 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1144 else {
1145 uplink = manager_find_uplink(link->manager, link);
1146 acquired_uplink = true;
1147
1148 if (!uplink) {
1149 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1150 r = 0;
1151 } else
1152 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1153 }
1154 if (r < 0)
1155 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1156 }
1157
1158 if (link->network->dhcp_server_emit_ntp) {
1159
1160 if (link->network->n_dhcp_server_ntp > 0)
1161 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1162 else {
1163 if (!acquired_uplink)
1164 uplink = manager_find_uplink(link->manager, link);
1165
1166 if (!uplink) {
1167 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1168 r = 0;
1169 } else
1170 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1171
1172 }
1173 if (r < 0)
1174 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1175 }
1176
1177 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1178 if (r < 0) {
1179 log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1180 return r;
1181 }
1182
1183 if (link->network->dhcp_server_emit_timezone) {
1184 _cleanup_free_ char *buffer = NULL;
1185 const char *tz = NULL;
1186
1187 if (link->network->dhcp_server_timezone)
1188 tz = link->network->dhcp_server_timezone;
1189 else {
1190 r = get_timezone(&buffer);
1191 if (r < 0)
1192 log_warning_errno(r, "Failed to determine timezone: %m");
1193 else
1194 tz = buffer;
1195 }
1196
1197 if (tz) {
1198 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1199 if (r < 0)
1200 return r;
1201 }
1202 }
1203
1204 r = sd_dhcp_server_start(link->dhcp_server);
1205 if (r < 0) {
1206 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1207
1208 link_enter_failed(link);
1209
1210 return 0;
1211 }
1212
1213 log_link_debug(link, "Offering DHCPv4 leases");
1214 }
1215
1216 if (link->address_messages == 0)
1217 link_enter_set_routes(link);
1218 else
1219 log_link_debug(link, "Setting addresses");
1220
1221 return 0;
1222 }
1223
1224 int link_address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1225 _cleanup_(link_unrefp) Link *link = userdata;
1226 int r;
1227
1228 assert(m);
1229 assert(link);
1230 assert(link->ifname);
1231
1232 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1233 return 1;
1234
1235 r = sd_netlink_message_get_errno(m);
1236 if (r < 0 && r != -EADDRNOTAVAIL)
1237 log_link_warning_errno(link, r, "Could not drop address: %m");
1238
1239 return 1;
1240 }
1241
1242 static int link_set_bridge_vlan(Link *link) {
1243 int r = 0;
1244
1245 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1246 if (r < 0)
1247 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1248
1249 return r;
1250 }
1251
1252 static int link_set_proxy_arp(Link *link) {
1253 const char *p = NULL;
1254 int r;
1255
1256 if (!link_proxy_arp_enabled(link))
1257 return 0;
1258
1259 p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/proxy_arp");
1260
1261 r = write_string_file(p, one_zero(link->network->proxy_arp), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
1262 if (r < 0)
1263 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1264
1265 return 0;
1266 }
1267
1268 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1269 _cleanup_(link_unrefp) Link *link = userdata;
1270 int r;
1271
1272 log_link_debug(link, "Set link");
1273
1274 r = sd_netlink_message_get_errno(m);
1275 if (r < 0 && r != -EEXIST) {
1276 log_link_error_errno(link, r, "Could not join netdev: %m");
1277 link_enter_failed(link);
1278 return 1;
1279 }
1280
1281 return 0;
1282 }
1283
1284 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1285 _cleanup_(link_unrefp) Link *link = userdata;
1286 int r;
1287
1288 assert(m);
1289 assert(link);
1290 assert(link->ifname);
1291
1292 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1293 return 1;
1294
1295 r = sd_netlink_message_get_errno(m);
1296 if (r < 0)
1297 log_link_warning_errno(link, r, "Could not set MTU: %m");
1298
1299 return 1;
1300 }
1301
1302 int link_set_mtu(Link *link, uint32_t mtu) {
1303 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1304 int r;
1305
1306 assert(link);
1307 assert(link->manager);
1308 assert(link->manager->rtnl);
1309
1310 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1311
1312 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1313 if (r < 0)
1314 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1315
1316 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1317 for this interface, or if it is a bridge slave, then disable IPv6 else enable it. */
1318 (void) link_enable_ipv6(link);
1319
1320 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1321 on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1322 if (link_ipv6_enabled(link) && link->network->mtu < IPV6_MIN_MTU) {
1323
1324 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1325 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1326
1327 link->network->mtu = IPV6_MIN_MTU;
1328 }
1329
1330 r = sd_netlink_message_append_u32(req, IFLA_MTU, link->network->mtu);
1331 if (r < 0)
1332 return log_link_error_errno(link, r, "Could not set MTU: %m");
1333
1334 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1335 if (r < 0)
1336 return log_link_error_errno(link, r, "Could not append MTU: %m");
1337
1338 r = sd_netlink_call_async(link->manager->rtnl, req, set_mtu_handler, link, 0, NULL);
1339 if (r < 0)
1340 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1341
1342 link->setting_mtu = true;
1343
1344 link_ref(link);
1345
1346 return 0;
1347 }
1348
1349 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1350 _cleanup_(link_unrefp) Link *link = userdata;
1351 int r;
1352
1353 assert(m);
1354 assert(link);
1355 assert(link->ifname);
1356
1357 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1358 return 1;
1359
1360 r = sd_netlink_message_get_errno(m);
1361 if (r < 0)
1362 log_link_warning_errno(link, r, "Could not set link flags: %m");
1363
1364 return 1;
1365 }
1366
1367 static int link_set_flags(Link *link) {
1368 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1369 unsigned ifi_change = 0;
1370 unsigned ifi_flags = 0;
1371 int r;
1372
1373 assert(link);
1374 assert(link->manager);
1375 assert(link->manager->rtnl);
1376
1377 if (link->flags & IFF_LOOPBACK)
1378 return 0;
1379
1380 if (!link->network)
1381 return 0;
1382
1383 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1384 return 0;
1385
1386 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1387 if (r < 0)
1388 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1389
1390 if (link->network->arp >= 0) {
1391 ifi_change |= IFF_NOARP;
1392 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1393 }
1394
1395 if (link->network->multicast >= 0) {
1396 ifi_change |= IFF_MULTICAST;
1397 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1398 }
1399
1400 if (link->network->allmulticast >= 0) {
1401 ifi_change |= IFF_ALLMULTI;
1402 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1403 }
1404
1405 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1406 if (r < 0)
1407 return log_link_error_errno(link, r, "Could not set link flags: %m");
1408
1409 r = sd_netlink_call_async(link->manager->rtnl, req, set_flags_handler, link, 0, NULL);
1410 if (r < 0)
1411 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1412
1413 link_ref(link);
1414
1415 return 0;
1416 }
1417
1418 static int link_set_bridge(Link *link) {
1419 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1420 int r;
1421
1422 assert(link);
1423 assert(link->network);
1424
1425 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1426 if (r < 0)
1427 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1428
1429 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1430 if (r < 0)
1431 return log_link_error_errno(link, r, "Could not set message family: %m");
1432
1433 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1434 if (r < 0)
1435 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1436
1437 if (link->network->use_bpdu >= 0) {
1438 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
1439 if (r < 0)
1440 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1441 }
1442
1443 if (link->network->hairpin >= 0) {
1444 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1445 if (r < 0)
1446 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1447 }
1448
1449 if (link->network->fast_leave >= 0) {
1450 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1451 if (r < 0)
1452 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1453 }
1454
1455 if (link->network->allow_port_to_be_root >= 0) {
1456 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
1457 if (r < 0)
1458 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1459
1460 }
1461
1462 if (link->network->unicast_flood >= 0) {
1463 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1464 if (r < 0)
1465 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1466
1467 }
1468
1469 if (link->network->cost != 0) {
1470 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1471 if (r < 0)
1472 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1473 }
1474 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1475 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1476 if (r < 0)
1477 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1478 }
1479
1480 r = sd_netlink_message_close_container(req);
1481 if (r < 0)
1482 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1483
1484 r = sd_netlink_call_async(link->manager->rtnl, req, link_set_handler, link, 0, NULL);
1485 if (r < 0)
1486 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1487
1488 link_ref(link);
1489
1490 return r;
1491 }
1492
1493 static int link_bond_set(Link *link) {
1494 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1495 int r;
1496
1497 assert(link);
1498 assert(link->network);
1499
1500 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1501 if (r < 0)
1502 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1503
1504 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1505 if (r < 0)
1506 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1507
1508 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1509 if (r < 0)
1510 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1511
1512 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1513 if (r < 0)
1514 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1515
1516 if (link->network->active_slave) {
1517 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1518 if (r < 0)
1519 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1520 }
1521
1522 if (link->network->primary_slave) {
1523 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1524 if (r < 0)
1525 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1526 }
1527
1528 r = sd_netlink_message_close_container(req);
1529 if (r < 0)
1530 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1531
1532 r = sd_netlink_message_close_container(req);
1533 if (r < 0)
1534 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1535
1536 r = sd_netlink_call_async(link->manager->rtnl, req, set_flags_handler, link, 0, NULL);
1537 if (r < 0)
1538 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1539
1540 link_ref(link);
1541
1542 return r;
1543 }
1544
1545 static int link_lldp_save(Link *link) {
1546 _cleanup_free_ char *temp_path = NULL;
1547 _cleanup_fclose_ FILE *f = NULL;
1548 sd_lldp_neighbor **l = NULL;
1549 int n = 0, r, i;
1550
1551 assert(link);
1552 assert(link->lldp_file);
1553
1554 if (!link->lldp) {
1555 (void) unlink(link->lldp_file);
1556 return 0;
1557 }
1558
1559 r = sd_lldp_get_neighbors(link->lldp, &l);
1560 if (r < 0)
1561 goto finish;
1562 if (r == 0) {
1563 (void) unlink(link->lldp_file);
1564 goto finish;
1565 }
1566
1567 n = r;
1568
1569 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1570 if (r < 0)
1571 goto finish;
1572
1573 fchmod(fileno(f), 0644);
1574
1575 for (i = 0; i < n; i++) {
1576 const void *p;
1577 le64_t u;
1578 size_t sz;
1579
1580 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1581 if (r < 0)
1582 goto finish;
1583
1584 u = htole64(sz);
1585 (void) fwrite(&u, 1, sizeof(u), f);
1586 (void) fwrite(p, 1, sz, f);
1587 }
1588
1589 r = fflush_and_check(f);
1590 if (r < 0)
1591 goto finish;
1592
1593 if (rename(temp_path, link->lldp_file) < 0) {
1594 r = -errno;
1595 goto finish;
1596 }
1597
1598 finish:
1599 if (r < 0) {
1600 (void) unlink(link->lldp_file);
1601 if (temp_path)
1602 (void) unlink(temp_path);
1603
1604 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1605 }
1606
1607 if (l) {
1608 for (i = 0; i < n; i++)
1609 sd_lldp_neighbor_unref(l[i]);
1610 free(l);
1611 }
1612
1613 return r;
1614 }
1615
1616 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1617 Link *link = userdata;
1618 int r;
1619
1620 assert(link);
1621
1622 (void) link_lldp_save(link);
1623
1624 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1625 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1626
1627 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1628
1629 r = link_lldp_emit_start(link);
1630 if (r < 0)
1631 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1632 }
1633 }
1634
1635 static int link_acquire_ipv6_conf(Link *link) {
1636 int r;
1637
1638 assert(link);
1639
1640 if (link_dhcp6_enabled(link)) {
1641 assert(link->dhcp6_client);
1642 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1643
1644 /* start DHCPv6 client in stateless mode */
1645 r = dhcp6_request_address(link, true);
1646 if (r < 0 && r != -EBUSY)
1647 return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m");
1648 else
1649 log_link_debug(link, "Acquiring DHCPv6 lease");
1650 }
1651
1652 if (link_ipv6_accept_ra_enabled(link)) {
1653 assert(link->ndisc);
1654
1655 log_link_debug(link, "Discovering IPv6 routers");
1656
1657 r = sd_ndisc_start(link->ndisc);
1658 if (r < 0 && r != -EBUSY)
1659 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1660 }
1661
1662 if (link_radv_enabled(link)) {
1663 assert(link->radv);
1664 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1665
1666 log_link_debug(link, "Starting IPv6 Router Advertisements");
1667
1668 r = sd_radv_start(link->radv);
1669 if (r < 0 && r != -EBUSY)
1670 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1671 }
1672
1673 return 0;
1674 }
1675
1676 static int link_acquire_ipv4_conf(Link *link) {
1677 int r;
1678
1679 assert(link);
1680 assert(link->network);
1681 assert(link->manager);
1682 assert(link->manager->event);
1683
1684 if (link_ipv4ll_enabled(link)) {
1685 assert(link->ipv4ll);
1686
1687 log_link_debug(link, "Acquiring IPv4 link-local address");
1688
1689 r = sd_ipv4ll_start(link->ipv4ll);
1690 if (r < 0)
1691 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1692 }
1693
1694 if (link_dhcp4_enabled(link)) {
1695 assert(link->dhcp_client);
1696
1697 log_link_debug(link, "Acquiring DHCPv4 lease");
1698
1699 r = sd_dhcp_client_start(link->dhcp_client);
1700 if (r < 0)
1701 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1702 }
1703
1704 return 0;
1705 }
1706
1707 static int link_acquire_conf(Link *link) {
1708 int r;
1709
1710 assert(link);
1711
1712 if (link->setting_mtu) {
1713 link->setting_mtu = false;
1714 return 0;
1715 }
1716
1717 r = link_acquire_ipv4_conf(link);
1718 if (r < 0)
1719 return r;
1720
1721 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) == 0) {
1722 r = link_acquire_ipv6_conf(link);
1723 if (r < 0)
1724 return r;
1725 }
1726
1727 if (link_lldp_emit_enabled(link)) {
1728 r = link_lldp_emit_start(link);
1729 if (r < 0)
1730 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1731 }
1732
1733 return 0;
1734 }
1735
1736 bool link_has_carrier(Link *link) {
1737 /* see Documentation/networking/operstates.txt in the kernel sources */
1738
1739 if (link->kernel_operstate == IF_OPER_UP)
1740 return true;
1741
1742 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1743 /* operstate may not be implemented, so fall back to flags */
1744 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1745 return true;
1746
1747 return false;
1748 }
1749
1750 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1751 _cleanup_(link_unrefp) Link *link = userdata;
1752 int r;
1753
1754 assert(link);
1755
1756 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1757 return 1;
1758
1759 r = sd_netlink_message_get_errno(m);
1760 if (r < 0)
1761 /* we warn but don't fail the link, as it may be
1762 brought up later */
1763 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1764
1765 return 1;
1766 }
1767
1768 int link_up(Link *link) {
1769 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1770 uint8_t ipv6ll_mode;
1771 int r;
1772
1773 assert(link);
1774 assert(link->network);
1775 assert(link->manager);
1776 assert(link->manager->rtnl);
1777
1778 log_link_debug(link, "Bringing link up");
1779
1780 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1781 if (r < 0)
1782 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1783
1784 /* set it free if not enslaved with networkd */
1785 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1786 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1787 if (r < 0)
1788 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1789 }
1790
1791 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1792 if (r < 0)
1793 return log_link_error_errno(link, r, "Could not set link flags: %m");
1794
1795 if (link->network->mac) {
1796 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1797 if (r < 0)
1798 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1799 }
1800
1801 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1802 if (r < 0)
1803 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1804
1805 if (link_ipv6_enabled(link)) {
1806 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
1807 r = sd_netlink_message_open_container(req, AF_INET6);
1808 if (r < 0)
1809 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1810
1811 if (!link_ipv6ll_enabled(link))
1812 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1813 else {
1814 const char *p = NULL;
1815 _cleanup_free_ char *stable_secret = NULL;
1816
1817 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/stable_secret");
1818 r = read_one_line_file(p, &stable_secret);
1819
1820 if (r < 0)
1821 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1822 else
1823 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1824 }
1825 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1826 if (r < 0)
1827 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1828
1829 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
1830 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
1831 if (r < 0)
1832 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
1833 }
1834
1835 r = sd_netlink_message_close_container(req);
1836 if (r < 0)
1837 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1838 }
1839
1840 r = sd_netlink_message_close_container(req);
1841 if (r < 0)
1842 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1843
1844 r = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
1845 if (r < 0)
1846 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1847
1848 link_ref(link);
1849
1850 return 0;
1851 }
1852
1853 static int link_up_can(Link *link) {
1854 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1855 int r;
1856
1857 assert(link);
1858
1859 log_link_debug(link, "Bringing CAN link up");
1860
1861 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1862 if (r < 0)
1863 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1864
1865 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1866 if (r < 0)
1867 return log_link_error_errno(link, r, "Could not set link flags: %m");
1868
1869 r = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
1870 if (r < 0)
1871 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1872
1873 link_ref(link);
1874
1875 return 0;
1876 }
1877
1878 static int link_set_can(Link *link) {
1879 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
1880 int r;
1881
1882 assert(link);
1883 assert(link->network);
1884 assert(link->manager);
1885 assert(link->manager->rtnl);
1886
1887 log_link_debug(link, "link_set_can");
1888
1889 r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
1890 if (r < 0)
1891 return log_link_error_errno(link, r, "Failed to allocate netlink message: %m");
1892
1893 r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
1894 if (r < 0)
1895 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1896
1897 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
1898 if (r < 0)
1899 return log_link_error_errno(link, r, "Failed to open netlink container: %m");
1900
1901 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
1902 if (r < 0)
1903 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1904
1905 if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) {
1906 struct can_bittiming bt = {
1907 .bitrate = link->network->can_bitrate,
1908 .sample_point = link->network->can_sample_point,
1909 };
1910
1911 if (link->network->can_bitrate > UINT32_MAX) {
1912 log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate);
1913 return -ERANGE;
1914 }
1915
1916 log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate);
1917 if (link->network->can_sample_point > 0)
1918 log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
1919 else
1920 log_link_debug(link, "Using default sample point");
1921
1922 r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
1923 if (r < 0)
1924 return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
1925 }
1926
1927 if (link->network->can_restart_us > 0) {
1928 char time_string[FORMAT_TIMESPAN_MAX];
1929 uint64_t restart_ms;
1930
1931 if (link->network->can_restart_us == USEC_INFINITY)
1932 restart_ms = 0;
1933 else
1934 restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC);
1935
1936 format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC);
1937
1938 if (restart_ms > UINT32_MAX) {
1939 log_link_error(link, "restart timeout (%s) too big.", time_string);
1940 return -ERANGE;
1941 }
1942
1943 log_link_debug(link, "Setting restart = %s", time_string);
1944
1945 r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
1946 if (r < 0)
1947 return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
1948 }
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_message_close_container(m);
1955 if (r < 0)
1956 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
1957
1958 r = sd_netlink_call_async(link->manager->rtnl, m, link_set_handler, link, 0, NULL);
1959 if (r < 0)
1960 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1961
1962 link_ref(link);
1963
1964 if (!(link->flags & IFF_UP)) {
1965 r = link_up_can(link);
1966 if (r < 0) {
1967 link_enter_failed(link);
1968 return r;
1969 }
1970 }
1971
1972 log_link_debug(link, "link_set_can done");
1973
1974 return r;
1975 }
1976
1977 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1978 _cleanup_(link_unrefp) Link *link = userdata;
1979 int r;
1980
1981 assert(link);
1982
1983 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1984 return 1;
1985
1986 r = sd_netlink_message_get_errno(m);
1987 if (r < 0)
1988 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1989
1990 if (streq_ptr(link->kind, "can")) {
1991 link_ref(link);
1992 link_set_can(link);
1993 }
1994
1995 return 1;
1996 }
1997
1998 int link_down(Link *link) {
1999 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2000 int r;
2001
2002 assert(link);
2003 assert(link->manager);
2004 assert(link->manager->rtnl);
2005
2006 log_link_debug(link, "Bringing link down");
2007
2008 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
2009 RTM_SETLINK, link->ifindex);
2010 if (r < 0)
2011 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2012
2013 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
2014 if (r < 0)
2015 return log_link_error_errno(link, r, "Could not set link flags: %m");
2016
2017 r = sd_netlink_call_async(link->manager->rtnl, req, link_down_handler, link, 0, NULL);
2018 if (r < 0)
2019 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2020
2021 link_ref(link);
2022
2023 return 0;
2024 }
2025
2026 static int link_handle_bound_to_list(Link *link) {
2027 Link *l;
2028 Iterator i;
2029 int r;
2030 bool required_up = false;
2031 bool link_is_up = false;
2032
2033 assert(link);
2034
2035 if (hashmap_isempty(link->bound_to_links))
2036 return 0;
2037
2038 if (link->flags & IFF_UP)
2039 link_is_up = true;
2040
2041 HASHMAP_FOREACH (l, link->bound_to_links, i)
2042 if (link_has_carrier(l)) {
2043 required_up = true;
2044 break;
2045 }
2046
2047 if (!required_up && link_is_up) {
2048 r = link_down(link);
2049 if (r < 0)
2050 return r;
2051 } else if (required_up && !link_is_up) {
2052 r = link_up(link);
2053 if (r < 0)
2054 return r;
2055 }
2056
2057 return 0;
2058 }
2059
2060 static int link_handle_bound_by_list(Link *link) {
2061 Iterator i;
2062 Link *l;
2063 int r;
2064
2065 assert(link);
2066
2067 if (hashmap_isempty(link->bound_by_links))
2068 return 0;
2069
2070 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2071 r = link_handle_bound_to_list(l);
2072 if (r < 0)
2073 return r;
2074 }
2075
2076 return 0;
2077 }
2078
2079 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2080 int r;
2081
2082 assert(link);
2083 assert(carrier);
2084
2085 if (link == carrier)
2086 return 0;
2087
2088 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2089 return 0;
2090
2091 r = hashmap_ensure_allocated(h, NULL);
2092 if (r < 0)
2093 return r;
2094
2095 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2096 if (r < 0)
2097 return r;
2098
2099 return 0;
2100 }
2101
2102 static int link_new_bound_by_list(Link *link) {
2103 Manager *m;
2104 Link *carrier;
2105 Iterator i;
2106 int r;
2107 bool list_updated = false;
2108
2109 assert(link);
2110 assert(link->manager);
2111
2112 m = link->manager;
2113
2114 HASHMAP_FOREACH(carrier, m->links, i) {
2115 if (!carrier->network)
2116 continue;
2117
2118 if (strv_isempty(carrier->network->bind_carrier))
2119 continue;
2120
2121 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2122 r = link_put_carrier(link, carrier, &link->bound_by_links);
2123 if (r < 0)
2124 return r;
2125
2126 list_updated = true;
2127 }
2128 }
2129
2130 if (list_updated)
2131 link_dirty(link);
2132
2133 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2134 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2135 if (r < 0)
2136 return r;
2137
2138 link_dirty(carrier);
2139 }
2140
2141 return 0;
2142 }
2143
2144 static int link_new_bound_to_list(Link *link) {
2145 Manager *m;
2146 Link *carrier;
2147 Iterator i;
2148 int r;
2149 bool list_updated = false;
2150
2151 assert(link);
2152 assert(link->manager);
2153
2154 if (!link->network)
2155 return 0;
2156
2157 if (strv_isempty(link->network->bind_carrier))
2158 return 0;
2159
2160 m = link->manager;
2161
2162 HASHMAP_FOREACH (carrier, m->links, i) {
2163 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2164 r = link_put_carrier(link, carrier, &link->bound_to_links);
2165 if (r < 0)
2166 return r;
2167
2168 list_updated = true;
2169 }
2170 }
2171
2172 if (list_updated)
2173 link_dirty(link);
2174
2175 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2176 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2177 if (r < 0)
2178 return r;
2179
2180 link_dirty(carrier);
2181 }
2182
2183 return 0;
2184 }
2185
2186 static int link_new_carrier_maps(Link *link) {
2187 int r;
2188
2189 r = link_new_bound_by_list(link);
2190 if (r < 0)
2191 return r;
2192
2193 r = link_handle_bound_by_list(link);
2194 if (r < 0)
2195 return r;
2196
2197 r = link_new_bound_to_list(link);
2198 if (r < 0)
2199 return r;
2200
2201 r = link_handle_bound_to_list(link);
2202 if (r < 0)
2203 return r;
2204
2205 return 0;
2206 }
2207
2208 static void link_free_bound_to_list(Link *link) {
2209 Link *bound_to;
2210 Iterator i;
2211
2212 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2213 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2214
2215 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2216 link_dirty(bound_to);
2217 }
2218
2219 return;
2220 }
2221
2222 static void link_free_bound_by_list(Link *link) {
2223 Link *bound_by;
2224 Iterator i;
2225
2226 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2227 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2228
2229 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2230 link_dirty(bound_by);
2231 link_handle_bound_to_list(bound_by);
2232 }
2233 }
2234
2235 return;
2236 }
2237
2238 static void link_free_carrier_maps(Link *link) {
2239 bool list_updated = false;
2240
2241 assert(link);
2242
2243 if (!hashmap_isempty(link->bound_to_links)) {
2244 link_free_bound_to_list(link);
2245 list_updated = true;
2246 }
2247
2248 if (!hashmap_isempty(link->bound_by_links)) {
2249 link_free_bound_by_list(link);
2250 list_updated = true;
2251 }
2252
2253 if (list_updated)
2254 link_dirty(link);
2255
2256 return;
2257 }
2258
2259 void link_drop(Link *link) {
2260 if (!link || link->state == LINK_STATE_LINGER)
2261 return;
2262
2263 link_set_state(link, LINK_STATE_LINGER);
2264
2265 link_free_carrier_maps(link);
2266
2267 log_link_debug(link, "Link removed");
2268
2269 (void) unlink(link->state_file);
2270 link_unref(link);
2271
2272 return;
2273 }
2274
2275 static int link_joined(Link *link) {
2276 int r;
2277
2278 assert(link);
2279 assert(link->network);
2280
2281 if (!hashmap_isempty(link->bound_to_links)) {
2282 r = link_handle_bound_to_list(link);
2283 if (r < 0)
2284 return r;
2285 } else if (!(link->flags & IFF_UP)) {
2286 r = link_up(link);
2287 if (r < 0) {
2288 link_enter_failed(link);
2289 return r;
2290 }
2291 }
2292
2293 if (link->network->bridge) {
2294 r = link_set_bridge(link);
2295 if (r < 0)
2296 log_link_error_errno(link, r, "Could not set bridge message: %m");
2297 }
2298
2299 if (link->network->bond) {
2300 r = link_bond_set(link);
2301 if (r < 0)
2302 log_link_error_errno(link, r, "Could not set bond message: %m");
2303 }
2304
2305 if (link->network->use_br_vlan &&
2306 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2307 r = link_set_bridge_vlan(link);
2308 if (r < 0)
2309 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2310 }
2311
2312 /* Skip setting up addresses until it gets carrier,
2313 or it would try to set addresses twice,
2314 which is bad for non-idempotent steps. */
2315 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2316 return 0;
2317
2318 return link_enter_set_addresses(link);
2319 }
2320
2321 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
2322 _cleanup_(link_unrefp) Link *link = userdata;
2323 int r;
2324
2325 assert(link);
2326 assert(link->network);
2327
2328 link->enslaving--;
2329
2330 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2331 return 1;
2332
2333 r = sd_netlink_message_get_errno(m);
2334 if (r < 0 && r != -EEXIST) {
2335 log_link_error_errno(link, r, "Could not join netdev: %m");
2336 link_enter_failed(link);
2337 return 1;
2338 } else
2339 log_link_debug(link, "Joined netdev");
2340
2341 if (link->enslaving <= 0)
2342 link_joined(link);
2343
2344 return 1;
2345 }
2346
2347 static int link_enter_join_netdev(Link *link) {
2348 NetDev *netdev;
2349 Iterator i;
2350 int r;
2351
2352 assert(link);
2353 assert(link->network);
2354 assert(link->state == LINK_STATE_PENDING);
2355
2356 link_set_state(link, LINK_STATE_ENSLAVING);
2357
2358 link_dirty(link);
2359
2360 if (!link->network->bridge &&
2361 !link->network->bond &&
2362 !link->network->vrf &&
2363 hashmap_isempty(link->network->stacked_netdevs))
2364 return link_joined(link);
2365
2366 if (link->network->bond) {
2367 log_struct(LOG_DEBUG,
2368 LOG_LINK_INTERFACE(link),
2369 LOG_NETDEV_INTERFACE(link->network->bond),
2370 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2371
2372 r = netdev_join(link->network->bond, link, netdev_join_handler);
2373 if (r < 0) {
2374 log_struct_errno(LOG_WARNING, r,
2375 LOG_LINK_INTERFACE(link),
2376 LOG_NETDEV_INTERFACE(link->network->bond),
2377 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2378 link_enter_failed(link);
2379 return r;
2380 }
2381
2382 link->enslaving++;
2383 }
2384
2385 if (link->network->bridge) {
2386 log_struct(LOG_DEBUG,
2387 LOG_LINK_INTERFACE(link),
2388 LOG_NETDEV_INTERFACE(link->network->bridge),
2389 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2390
2391 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2392 if (r < 0) {
2393 log_struct_errno(LOG_WARNING, r,
2394 LOG_LINK_INTERFACE(link),
2395 LOG_NETDEV_INTERFACE(link->network->bridge),
2396 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2397 link_enter_failed(link);
2398 return r;
2399 }
2400
2401 link->enslaving++;
2402 }
2403
2404 if (link->network->vrf) {
2405 log_struct(LOG_DEBUG,
2406 LOG_LINK_INTERFACE(link),
2407 LOG_NETDEV_INTERFACE(link->network->vrf),
2408 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2409
2410 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2411 if (r < 0) {
2412 log_struct_errno(LOG_WARNING, r,
2413 LOG_LINK_INTERFACE(link),
2414 LOG_NETDEV_INTERFACE(link->network->vrf),
2415 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2416 link_enter_failed(link);
2417 return r;
2418 }
2419
2420 link->enslaving++;
2421 }
2422
2423 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2424
2425 if (netdev->ifindex > 0) {
2426 link_joined(link);
2427 continue;
2428 }
2429
2430 log_struct(LOG_DEBUG,
2431 LOG_LINK_INTERFACE(link),
2432 LOG_NETDEV_INTERFACE(netdev),
2433 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2434
2435 r = netdev_join(netdev, link, netdev_join_handler);
2436 if (r < 0) {
2437 log_struct_errno(LOG_WARNING, r,
2438 LOG_LINK_INTERFACE(link),
2439 LOG_NETDEV_INTERFACE(netdev),
2440 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2441 link_enter_failed(link);
2442 return r;
2443 }
2444
2445 link->enslaving++;
2446 }
2447
2448 return 0;
2449 }
2450
2451 static int link_set_ipv4_forward(Link *link) {
2452 int r;
2453
2454 if (!link_ipv4_forward_enabled(link))
2455 return 0;
2456
2457 /* We propagate the forwarding flag from one interface to the
2458 * global setting one way. This means: as long as at least one
2459 * interface was configured at any time that had IP forwarding
2460 * enabled the setting will stay on for good. We do this
2461 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2462 * somewhat in sync (see below). */
2463
2464 r = write_string_file("/proc/sys/net/ipv4/ip_forward", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2465 if (r < 0)
2466 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2467
2468 return 0;
2469 }
2470
2471 static int link_set_ipv6_forward(Link *link) {
2472 int r;
2473
2474 if (!link_ipv6_forward_enabled(link))
2475 return 0;
2476
2477 /* On Linux, the IPv6 stack does not know a per-interface
2478 * packet forwarding setting: either packet forwarding is on
2479 * for all, or off for all. We hence don't bother with a
2480 * per-interface setting, but simply propagate the interface
2481 * flag, if it is set, to the global flag, one-way. Note that
2482 * while IPv4 would allow a per-interface flag, we expose the
2483 * same behaviour there and also propagate the setting from
2484 * one to all, to keep things simple (see above). */
2485
2486 r = write_string_file("/proc/sys/net/ipv6/conf/all/forwarding", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2487 if (r < 0)
2488 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2489
2490 return 0;
2491 }
2492
2493 static int link_set_ipv6_privacy_extensions(Link *link) {
2494 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2495 IPv6PrivacyExtensions s;
2496 const char *p = NULL;
2497 int r;
2498
2499 s = link_ipv6_privacy_extensions(link);
2500 if (s < 0)
2501 return 0;
2502
2503 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/use_tempaddr");
2504 xsprintf(buf, "%u", (unsigned) link->network->ipv6_privacy_extensions);
2505
2506 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2507 if (r < 0)
2508 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2509
2510 return 0;
2511 }
2512
2513 static int link_set_ipv6_accept_ra(Link *link) {
2514 const char *p = NULL;
2515 int r;
2516
2517 /* Make this a NOP if IPv6 is not available */
2518 if (!socket_ipv6_is_supported())
2519 return 0;
2520
2521 if (link->flags & IFF_LOOPBACK)
2522 return 0;
2523
2524 if (!link->network)
2525 return 0;
2526
2527 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/accept_ra");
2528
2529 /* We handle router advertisements ourselves, tell the kernel to GTFO */
2530 r = write_string_file(p, "0", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2531 if (r < 0)
2532 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2533
2534 return 0;
2535 }
2536
2537 static int link_set_ipv6_dad_transmits(Link *link) {
2538 char buf[DECIMAL_STR_MAX(int) + 1];
2539 const char *p = NULL;
2540 int r;
2541
2542 /* Make this a NOP if IPv6 is not available */
2543 if (!socket_ipv6_is_supported())
2544 return 0;
2545
2546 if (link->flags & IFF_LOOPBACK)
2547 return 0;
2548
2549 if (!link->network)
2550 return 0;
2551
2552 if (link->network->ipv6_dad_transmits < 0)
2553 return 0;
2554
2555 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/dad_transmits");
2556 xsprintf(buf, "%i", link->network->ipv6_dad_transmits);
2557
2558 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2559 if (r < 0)
2560 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2561
2562 return 0;
2563 }
2564
2565 static int link_set_ipv6_hop_limit(Link *link) {
2566 char buf[DECIMAL_STR_MAX(int) + 1];
2567 const char *p = NULL;
2568 int r;
2569
2570 /* Make this a NOP if IPv6 is not available */
2571 if (!socket_ipv6_is_supported())
2572 return 0;
2573
2574 if (link->flags & IFF_LOOPBACK)
2575 return 0;
2576
2577 if (!link->network)
2578 return 0;
2579
2580 if (link->network->ipv6_hop_limit < 0)
2581 return 0;
2582
2583 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/hop_limit");
2584 xsprintf(buf, "%i", link->network->ipv6_hop_limit);
2585
2586 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2587 if (r < 0)
2588 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2589
2590 return 0;
2591 }
2592
2593 static int link_set_ipv6_mtu(Link *link) {
2594 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2595 const char *p = NULL;
2596 int r;
2597
2598 /* Make this a NOP if IPv6 is not available */
2599 if (!socket_ipv6_is_supported())
2600 return 0;
2601
2602 if (link->flags & IFF_LOOPBACK)
2603 return 0;
2604
2605 if (link->network->ipv6_mtu == 0)
2606 return 0;
2607
2608 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/mtu");
2609
2610 xsprintf(buf, "%" PRIu32, link->network->ipv6_mtu);
2611
2612 r = write_string_file(p, buf, 0);
2613 if (r < 0)
2614 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2615
2616 return 0;
2617 }
2618
2619 static int link_drop_foreign_config(Link *link) {
2620 Address *address;
2621 Route *route;
2622 Iterator i;
2623 int r;
2624
2625 SET_FOREACH(address, link->addresses_foreign, i) {
2626 /* we consider IPv6LL addresses to be managed by the kernel */
2627 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2628 continue;
2629
2630 r = address_remove(address, link, link_address_remove_handler);
2631 if (r < 0)
2632 return r;
2633 }
2634
2635 SET_FOREACH(route, link->routes_foreign, i) {
2636 /* do not touch routes managed by the kernel */
2637 if (route->protocol == RTPROT_KERNEL)
2638 continue;
2639
2640 r = route_remove(route, link, link_route_remove_handler);
2641 if (r < 0)
2642 return r;
2643 }
2644
2645 return 0;
2646 }
2647
2648 static int link_drop_config(Link *link) {
2649 Address *address, *pool_address;
2650 Route *route;
2651 Iterator i;
2652 int r;
2653
2654 SET_FOREACH(address, link->addresses, i) {
2655 /* we consider IPv6LL addresses to be managed by the kernel */
2656 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2657 continue;
2658
2659 r = address_remove(address, link, link_address_remove_handler);
2660 if (r < 0)
2661 return r;
2662
2663 /* If this address came from an address pool, clean up the pool */
2664 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2665 if (address_equal(address, pool_address)) {
2666 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2667 address_free(pool_address);
2668 break;
2669 }
2670 }
2671 }
2672
2673 SET_FOREACH(route, link->routes, i) {
2674 /* do not touch routes managed by the kernel */
2675 if (route->protocol == RTPROT_KERNEL)
2676 continue;
2677
2678 r = route_remove(route, link, link_route_remove_handler);
2679 if (r < 0)
2680 return r;
2681 }
2682
2683 ndisc_flush(link);
2684
2685 return 0;
2686 }
2687
2688 static int link_update_lldp(Link *link) {
2689 int r;
2690
2691 assert(link);
2692
2693 if (!link->lldp)
2694 return 0;
2695
2696 if (link->flags & IFF_UP) {
2697 r = sd_lldp_start(link->lldp);
2698 if (r > 0)
2699 log_link_debug(link, "Started LLDP.");
2700 } else {
2701 r = sd_lldp_stop(link->lldp);
2702 if (r > 0)
2703 log_link_debug(link, "Stopped LLDP.");
2704 }
2705
2706 return r;
2707 }
2708
2709 static int link_configure_can(Link *link) {
2710 int r;
2711
2712 if (streq_ptr(link->kind, "can")) {
2713 /* The CAN interface must be down to configure bitrate, etc... */
2714 if ((link->flags & IFF_UP)) {
2715 r = link_down(link);
2716 if (r < 0) {
2717 link_enter_failed(link);
2718 return r;
2719 }
2720
2721 return 0;
2722 }
2723
2724 return link_set_can(link);
2725 }
2726
2727 if (!(link->flags & IFF_UP)) {
2728 r = link_up_can(link);
2729 if (r < 0) {
2730 link_enter_failed(link);
2731 return r;
2732 }
2733 }
2734
2735 return 0;
2736 }
2737
2738 static int link_configure(Link *link) {
2739 int r;
2740
2741 assert(link);
2742 assert(link->network);
2743 assert(link->state == LINK_STATE_PENDING);
2744
2745 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
2746 return link_configure_can(link);
2747
2748 /* Drop foreign config, but ignore loopback or critical devices.
2749 * We do not want to remove loopback address or addresses used for root NFS. */
2750 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2751 r = link_drop_foreign_config(link);
2752 if (r < 0)
2753 return r;
2754 }
2755
2756 r = link_set_proxy_arp(link);
2757 if (r < 0)
2758 return r;
2759
2760 r = ipv6_proxy_ndp_addresses_configure(link);
2761 if (r < 0)
2762 return r;
2763
2764 r = link_set_ipv4_forward(link);
2765 if (r < 0)
2766 return r;
2767
2768 r = link_set_ipv6_forward(link);
2769 if (r < 0)
2770 return r;
2771
2772 r = link_set_ipv6_privacy_extensions(link);
2773 if (r < 0)
2774 return r;
2775
2776 r = link_set_ipv6_accept_ra(link);
2777 if (r < 0)
2778 return r;
2779
2780 r = link_set_ipv6_dad_transmits(link);
2781 if (r < 0)
2782 return r;
2783
2784 r = link_set_ipv6_hop_limit(link);
2785 if (r < 0)
2786 return r;
2787
2788 r = link_set_flags(link);
2789 if (r < 0)
2790 return r;
2791
2792 r = link_set_ipv6_mtu(link);
2793 if (r < 0)
2794 return r;
2795
2796 if (link_ipv4ll_enabled(link)) {
2797 r = ipv4ll_configure(link);
2798 if (r < 0)
2799 return r;
2800 }
2801
2802 if (link_dhcp4_enabled(link)) {
2803 r = dhcp4_set_promote_secondaries(link);
2804 if (r < 0)
2805 return r;
2806
2807 r = dhcp4_configure(link);
2808 if (r < 0)
2809 return r;
2810 }
2811
2812 if (link_dhcp4_server_enabled(link)) {
2813 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2814 if (r < 0)
2815 return r;
2816
2817 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2818 if (r < 0)
2819 return r;
2820 }
2821
2822 if (link_dhcp6_enabled(link) ||
2823 link_ipv6_accept_ra_enabled(link)) {
2824 r = dhcp6_configure(link);
2825 if (r < 0)
2826 return r;
2827 }
2828
2829 if (link_ipv6_accept_ra_enabled(link)) {
2830 r = ndisc_configure(link);
2831 if (r < 0)
2832 return r;
2833 }
2834
2835 if (link_radv_enabled(link)) {
2836 r = radv_configure(link);
2837 if (r < 0)
2838 return r;
2839 }
2840
2841 if (link_lldp_rx_enabled(link)) {
2842 r = sd_lldp_new(&link->lldp);
2843 if (r < 0)
2844 return r;
2845
2846 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
2847 if (r < 0)
2848 return r;
2849
2850 r = sd_lldp_match_capabilities(link->lldp,
2851 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
2852 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
2853 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
2854 if (r < 0)
2855 return r;
2856
2857 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
2858 if (r < 0)
2859 return r;
2860
2861 r = sd_lldp_attach_event(link->lldp, NULL, 0);
2862 if (r < 0)
2863 return r;
2864
2865 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
2866 if (r < 0)
2867 return r;
2868
2869 r = link_update_lldp(link);
2870 if (r < 0)
2871 return r;
2872 }
2873
2874 if (link->network->mtu > 0) {
2875 r = link_set_mtu(link, link->network->mtu);
2876 if (r < 0)
2877 return r;
2878 }
2879
2880 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2881 r = link_acquire_conf(link);
2882 if (r < 0)
2883 return r;
2884 }
2885
2886 return link_enter_join_netdev(link);
2887 }
2888
2889 static int link_initialized_and_synced(sd_netlink *rtnl, sd_netlink_message *m,
2890 void *userdata) {
2891 _cleanup_(link_unrefp) Link *link = userdata;
2892 Network *network;
2893 int r;
2894
2895 assert(link);
2896 assert(link->ifname);
2897 assert(link->manager);
2898
2899 if (link->state != LINK_STATE_PENDING)
2900 return 1;
2901
2902 log_link_debug(link, "Link state is up-to-date");
2903
2904 r = link_new_bound_by_list(link);
2905 if (r < 0)
2906 return r;
2907
2908 r = link_handle_bound_by_list(link);
2909 if (r < 0)
2910 return r;
2911
2912 if (!link->network) {
2913 r = network_get(link->manager, link->udev_device, link->ifname,
2914 &link->mac, &network);
2915 if (r == -ENOENT) {
2916 link_enter_unmanaged(link);
2917 return 1;
2918 } else if (r == 0 && network->unmanaged) {
2919 link_enter_unmanaged(link);
2920 return 0;
2921 } else if (r < 0)
2922 return r;
2923
2924 if (link->flags & IFF_LOOPBACK) {
2925 if (network->link_local != ADDRESS_FAMILY_NO)
2926 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2927
2928 if (network->dhcp != ADDRESS_FAMILY_NO)
2929 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2930
2931 if (network->dhcp_server)
2932 log_link_debug(link, "Ignoring DHCP server for loopback link");
2933 }
2934
2935 r = network_apply(network, link);
2936 if (r < 0)
2937 return r;
2938 }
2939
2940 r = link_new_bound_to_list(link);
2941 if (r < 0)
2942 return r;
2943
2944 r = link_configure(link);
2945 if (r < 0)
2946 return r;
2947
2948 return 1;
2949 }
2950
2951 int link_initialized(Link *link, struct udev_device *device) {
2952 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2953 int r;
2954
2955 assert(link);
2956 assert(link->manager);
2957 assert(link->manager->rtnl);
2958 assert(device);
2959
2960 if (link->state != LINK_STATE_PENDING)
2961 return 0;
2962
2963 if (link->udev_device)
2964 return 0;
2965
2966 log_link_debug(link, "udev initialized link");
2967
2968 link->udev_device = udev_device_ref(device);
2969
2970 /* udev has initialized the link, but we don't know if we have yet
2971 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2972 * when it returns we know that the pending NEWLINKs have already been
2973 * processed and that we are up-to-date */
2974
2975 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2976 link->ifindex);
2977 if (r < 0)
2978 return r;
2979
2980 r = sd_netlink_call_async(link->manager->rtnl, req,
2981 link_initialized_and_synced, link, 0, NULL);
2982 if (r < 0)
2983 return r;
2984
2985 link_ref(link);
2986
2987 return 0;
2988 }
2989
2990 static int link_load(Link *link) {
2991 _cleanup_free_ char *network_file = NULL,
2992 *addresses = NULL,
2993 *routes = NULL,
2994 *dhcp4_address = NULL,
2995 *ipv4ll_address = NULL;
2996 union in_addr_union address;
2997 union in_addr_union route_dst;
2998 const char *p;
2999 int r;
3000
3001 assert(link);
3002
3003 r = parse_env_file(NULL, link->state_file, NEWLINE,
3004 "NETWORK_FILE", &network_file,
3005 "ADDRESSES", &addresses,
3006 "ROUTES", &routes,
3007 "DHCP4_ADDRESS", &dhcp4_address,
3008 "IPV4LL_ADDRESS", &ipv4ll_address,
3009 NULL);
3010 if (r < 0 && r != -ENOENT)
3011 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3012
3013 if (network_file) {
3014 Network *network;
3015 char *suffix;
3016
3017 /* drop suffix */
3018 suffix = strrchr(network_file, '.');
3019 if (!suffix) {
3020 log_link_debug(link, "Failed to get network name from %s", network_file);
3021 goto network_file_fail;
3022 }
3023 *suffix = '\0';
3024
3025 r = network_get_by_name(link->manager, basename(network_file), &network);
3026 if (r < 0) {
3027 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3028 goto network_file_fail;
3029 }
3030
3031 r = network_apply(network, link);
3032 if (r < 0)
3033 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3034 }
3035
3036 network_file_fail:
3037
3038 if (addresses) {
3039 p = addresses;
3040
3041 for (;;) {
3042 _cleanup_free_ char *address_str = NULL;
3043 char *prefixlen_str;
3044 int family;
3045 unsigned char prefixlen;
3046
3047 r = extract_first_word(&p, &address_str, NULL, 0);
3048 if (r < 0) {
3049 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3050 continue;
3051 }
3052 if (r == 0)
3053 break;
3054
3055 prefixlen_str = strchr(address_str, '/');
3056 if (!prefixlen_str) {
3057 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3058 continue;
3059 }
3060
3061 *prefixlen_str++ = '\0';
3062
3063 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3064 if (r != 1) {
3065 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3066 continue;
3067 }
3068
3069 r = in_addr_from_string_auto(address_str, &family, &address);
3070 if (r < 0) {
3071 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3072 continue;
3073 }
3074
3075 r = address_add(link, family, &address, prefixlen, NULL);
3076 if (r < 0)
3077 return log_link_error_errno(link, r, "Failed to add address: %m");
3078 }
3079 }
3080
3081 if (routes) {
3082 p = routes;
3083
3084 for (;;) {
3085 Route *route;
3086 _cleanup_free_ char *route_str = NULL;
3087 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3088 usec_t lifetime;
3089 char *prefixlen_str;
3090 int family;
3091 unsigned char prefixlen, tos, table;
3092 uint32_t priority;
3093
3094 r = extract_first_word(&p, &route_str, NULL, 0);
3095 if (r < 0) {
3096 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3097 continue;
3098 }
3099 if (r == 0)
3100 break;
3101
3102 prefixlen_str = strchr(route_str, '/');
3103 if (!prefixlen_str) {
3104 log_link_debug(link, "Failed to parse route %s", route_str);
3105 continue;
3106 }
3107
3108 *prefixlen_str++ = '\0';
3109
3110 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3111 if (r != 5) {
3112 log_link_debug(link,
3113 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3114 prefixlen_str);
3115 continue;
3116 }
3117
3118 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3119 if (r < 0) {
3120 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3121 continue;
3122 }
3123
3124 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3125 if (r < 0)
3126 return log_link_error_errno(link, r, "Failed to add route: %m");
3127
3128 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3129 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3130 0, route_expire_handler, route);
3131 if (r < 0)
3132 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3133 }
3134
3135 route->lifetime = lifetime;
3136 sd_event_source_unref(route->expire);
3137 route->expire = TAKE_PTR(expire);
3138 }
3139 }
3140
3141 if (dhcp4_address) {
3142 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3143 if (r < 0) {
3144 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3145 goto dhcp4_address_fail;
3146 }
3147
3148 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3149 if (r < 0)
3150 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3151
3152 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3153 if (r < 0)
3154 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3155 }
3156
3157 dhcp4_address_fail:
3158
3159 if (ipv4ll_address) {
3160 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3161 if (r < 0) {
3162 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3163 goto ipv4ll_address_fail;
3164 }
3165
3166 r = sd_ipv4ll_new(&link->ipv4ll);
3167 if (r < 0)
3168 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3169
3170 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3171 if (r < 0)
3172 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3173 }
3174
3175 ipv4ll_address_fail:
3176
3177 return 0;
3178 }
3179
3180 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3181 Link *link;
3182 _cleanup_(udev_device_unrefp) struct udev_device *device = NULL;
3183 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3184 int r;
3185
3186 assert(m);
3187 assert(m->rtnl);
3188 assert(message);
3189 assert(ret);
3190
3191 r = link_new(m, message, ret);
3192 if (r < 0)
3193 return r;
3194
3195 link = *ret;
3196
3197 log_link_debug(link, "Link %d added", link->ifindex);
3198
3199 r = link_load(link);
3200 if (r < 0)
3201 return r;
3202
3203 if (detect_container() <= 0) {
3204 /* not in a container, udev will be around */
3205 sprintf(ifindex_str, "n%d", link->ifindex);
3206 device = udev_device_new_from_device_id(m->udev, ifindex_str);
3207 if (!device) {
3208 r = log_link_warning_errno(link, errno, "Could not find udev device: %m");
3209 goto failed;
3210 }
3211
3212 if (udev_device_get_is_initialized(device) <= 0) {
3213 /* not yet ready */
3214 log_link_debug(link, "link pending udev initialization...");
3215 return 0;
3216 }
3217
3218 r = link_initialized(link, device);
3219 if (r < 0)
3220 goto failed;
3221 } else {
3222 /* we are calling a callback directly, so must take a ref */
3223 link_ref(link);
3224
3225 r = link_initialized_and_synced(m->rtnl, NULL, link);
3226 if (r < 0)
3227 goto failed;
3228 }
3229
3230 return 0;
3231 failed:
3232 link_enter_failed(link);
3233 return r;
3234 }
3235
3236 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3237 int r;
3238
3239 assert(link);
3240
3241 log_link_info(link, "Gained IPv6LL");
3242
3243 link->ipv6ll_address = *address;
3244 link_check_ready(link);
3245
3246 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3247 r = link_acquire_ipv6_conf(link);
3248 if (r < 0) {
3249 link_enter_failed(link);
3250 return r;
3251 }
3252 }
3253
3254 return 0;
3255 }
3256
3257 static int link_carrier_gained(Link *link) {
3258 int r;
3259
3260 assert(link);
3261
3262 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3263 r = link_acquire_conf(link);
3264 if (r < 0) {
3265 link_enter_failed(link);
3266 return r;
3267 }
3268
3269 r = link_enter_set_addresses(link);
3270 if (r < 0)
3271 return r;
3272 }
3273
3274 r = link_handle_bound_by_list(link);
3275 if (r < 0)
3276 return r;
3277
3278 return 0;
3279 }
3280
3281 static int link_carrier_lost(Link *link) {
3282 int r;
3283
3284 assert(link);
3285
3286 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3287 setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3288 configuration and stop the clients as well. */
3289 if (link->setting_mtu)
3290 return 0;
3291
3292 r = link_stop_clients(link);
3293 if (r < 0) {
3294 link_enter_failed(link);
3295 return r;
3296 }
3297
3298 if (link_dhcp4_server_enabled(link))
3299 (void) sd_dhcp_server_stop(link->dhcp_server);
3300
3301 r = link_drop_config(link);
3302 if (r < 0)
3303 return r;
3304
3305 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3306 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3307 r = link_drop_foreign_config(link);
3308 if (r < 0)
3309 return r;
3310 }
3311
3312 r = link_handle_bound_by_list(link);
3313 if (r < 0)
3314 return r;
3315
3316 return 0;
3317 }
3318
3319 int link_carrier_reset(Link *link) {
3320 int r;
3321
3322 assert(link);
3323
3324 if (link_has_carrier(link)) {
3325 r = link_carrier_lost(link);
3326 if (r < 0)
3327 return r;
3328
3329 r = link_carrier_gained(link);
3330 if (r < 0)
3331 return r;
3332
3333 log_link_info(link, "Reset carrier");
3334 }
3335
3336 return 0;
3337 }
3338
3339 int link_update(Link *link, sd_netlink_message *m) {
3340 struct ether_addr mac;
3341 const char *ifname;
3342 uint32_t mtu;
3343 bool had_carrier, carrier_gained, carrier_lost;
3344 int r;
3345
3346 assert(link);
3347 assert(link->ifname);
3348 assert(m);
3349
3350 if (link->state == LINK_STATE_LINGER) {
3351 link_ref(link);
3352 log_link_info(link, "Link readded");
3353 link_set_state(link, LINK_STATE_ENSLAVING);
3354
3355 r = link_new_carrier_maps(link);
3356 if (r < 0)
3357 return r;
3358 }
3359
3360 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3361 if (r >= 0 && !streq(ifname, link->ifname)) {
3362 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3363
3364 if (link->state == LINK_STATE_PENDING) {
3365 r = free_and_strdup(&link->ifname, ifname);
3366 if (r < 0)
3367 return r;
3368 } else {
3369 Manager *manager = link->manager;
3370
3371 link_drop(link);
3372 r = link_add(manager, m, &link);
3373 if (r < 0)
3374 return r;
3375 }
3376 }
3377
3378 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3379 if (r >= 0 && mtu > 0) {
3380 link->mtu = mtu;
3381 if (link->original_mtu == 0) {
3382 link->original_mtu = mtu;
3383 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3384 }
3385
3386 if (link->dhcp_client) {
3387 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3388 link->mtu);
3389 if (r < 0) {
3390 log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3391 return r;
3392 }
3393 }
3394
3395 if (link->radv) {
3396 r = sd_radv_set_mtu(link->radv, link->mtu);
3397 if (r < 0)
3398 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3399 }
3400 }
3401
3402 /* The kernel may broadcast NEWLINK messages without the MAC address
3403 set, simply ignore them. */
3404 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3405 if (r >= 0) {
3406 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3407 ETH_ALEN)) {
3408
3409 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3410 ETH_ALEN);
3411
3412 log_link_debug(link, "MAC address: "
3413 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3414 mac.ether_addr_octet[0],
3415 mac.ether_addr_octet[1],
3416 mac.ether_addr_octet[2],
3417 mac.ether_addr_octet[3],
3418 mac.ether_addr_octet[4],
3419 mac.ether_addr_octet[5]);
3420
3421 if (link->ipv4ll) {
3422 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3423 if (r < 0)
3424 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3425 }
3426
3427 if (link->dhcp_client) {
3428 r = sd_dhcp_client_set_mac(link->dhcp_client,
3429 (const uint8_t *) &link->mac,
3430 sizeof (link->mac),
3431 ARPHRD_ETHER);
3432 if (r < 0)
3433 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3434
3435 switch (link->network->dhcp_client_identifier) {
3436 case DHCP_CLIENT_ID_DUID: {
3437 const DUID *duid = link_duid(link);
3438
3439 r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
3440 link->network->iaid,
3441 duid->type,
3442 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3443 duid->raw_data_len);
3444 if (r < 0)
3445 return log_link_warning_errno(link, r, "Could not update DUID/IAID in DHCP client: %m");
3446 break;
3447 }
3448 case DHCP_CLIENT_ID_DUID_ONLY: {
3449 const DUID *duid = link_duid(link);
3450
3451 r = sd_dhcp_client_set_duid(link->dhcp_client,
3452 duid->type,
3453 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3454 duid->raw_data_len);
3455 if (r < 0)
3456 return log_link_warning_errno(link, r, "Could not update DUID in DHCP client: %m");
3457 break;
3458 }
3459 case DHCP_CLIENT_ID_MAC:
3460 r = sd_dhcp_client_set_client_id(link->dhcp_client,
3461 ARPHRD_ETHER,
3462 (const uint8_t *)&link->mac,
3463 sizeof(link->mac));
3464 if (r < 0)
3465 return log_link_warning_errno(link, r, "Could not update MAC client id in DHCP client: %m");
3466 break;
3467 default:
3468 assert_not_reached("Unknown client identifier type.");
3469 }
3470 }
3471
3472 if (link->dhcp6_client) {
3473 const DUID* duid = link_duid(link);
3474
3475 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3476 (const uint8_t *) &link->mac,
3477 sizeof (link->mac),
3478 ARPHRD_ETHER);
3479 if (r < 0)
3480 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3481
3482 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3483 link->network->iaid);
3484 if (r < 0)
3485 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3486
3487 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3488 duid->type,
3489 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3490 duid->raw_data_len);
3491 if (r < 0)
3492 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3493 }
3494
3495 if (link->radv) {
3496 r = sd_radv_set_mac(link->radv, &link->mac);
3497 if (r < 0)
3498 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3499 }
3500
3501 if (link->ndisc) {
3502 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3503 if (r < 0)
3504 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3505 }
3506 }
3507 }
3508
3509 had_carrier = link_has_carrier(link);
3510
3511 r = link_update_flags(link, m);
3512 if (r < 0)
3513 return r;
3514
3515 r = link_update_lldp(link);
3516 if (r < 0)
3517 return r;
3518
3519 carrier_gained = !had_carrier && link_has_carrier(link);
3520 carrier_lost = had_carrier && !link_has_carrier(link);
3521
3522 if (carrier_gained) {
3523 log_link_info(link, "Gained carrier");
3524
3525 r = link_carrier_gained(link);
3526 if (r < 0)
3527 return r;
3528 } else if (carrier_lost) {
3529 log_link_info(link, "Lost carrier");
3530
3531 r = link_carrier_lost(link);
3532 if (r < 0)
3533 return r;
3534 }
3535
3536 return 0;
3537 }
3538
3539 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3540 bool space = false;
3541 Iterator i;
3542 Link *link;
3543
3544 assert(f);
3545 assert(prefix);
3546
3547 if (hashmap_isempty(h))
3548 return;
3549
3550 fputs(prefix, f);
3551 HASHMAP_FOREACH(link, h, i) {
3552 if (space)
3553 fputc(' ', f);
3554
3555 fprintf(f, "%i", link->ifindex);
3556 space = true;
3557 }
3558
3559 fputc('\n', f);
3560 }
3561
3562 int link_save(Link *link) {
3563 _cleanup_free_ char *temp_path = NULL;
3564 _cleanup_fclose_ FILE *f = NULL;
3565 const char *admin_state, *oper_state;
3566 Address *a;
3567 Route *route;
3568 Iterator i;
3569 int r;
3570
3571 assert(link);
3572 assert(link->state_file);
3573 assert(link->lease_file);
3574 assert(link->manager);
3575
3576 if (link->state == LINK_STATE_LINGER) {
3577 unlink(link->state_file);
3578 return 0;
3579 }
3580
3581 link_lldp_save(link);
3582
3583 admin_state = link_state_to_string(link->state);
3584 assert(admin_state);
3585
3586 oper_state = link_operstate_to_string(link->operstate);
3587 assert(oper_state);
3588
3589 r = fopen_temporary(link->state_file, &f, &temp_path);
3590 if (r < 0)
3591 goto fail;
3592
3593 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
3594 (void) fchmod(fileno(f), 0644);
3595
3596 fprintf(f,
3597 "# This is private data. Do not parse.\n"
3598 "ADMIN_STATE=%s\n"
3599 "OPER_STATE=%s\n",
3600 admin_state, oper_state);
3601
3602 if (link->network) {
3603 bool space;
3604 sd_dhcp6_lease *dhcp6_lease = NULL;
3605 const char *dhcp_domainname = NULL;
3606 char **dhcp6_domains = NULL;
3607 char **dhcp_domains = NULL;
3608 unsigned j;
3609
3610 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3611 yes_no(link->network->required_for_online));
3612
3613 if (link->dhcp6_client) {
3614 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3615 if (r < 0 && r != -ENOMSG)
3616 log_link_debug(link, "No DHCPv6 lease");
3617 }
3618
3619 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3620
3621 fputs("DNS=", f);
3622 space = false;
3623
3624 for (j = 0; j < link->network->n_dns; j++) {
3625 _cleanup_free_ char *b = NULL;
3626
3627 r = in_addr_to_string(link->network->dns[j].family,
3628 &link->network->dns[j].address, &b);
3629 if (r < 0) {
3630 log_debug_errno(r, "Failed to format address, ignoring: %m");
3631 continue;
3632 }
3633
3634 if (space)
3635 fputc(' ', f);
3636 fputs(b, f);
3637 space = true;
3638 }
3639
3640 if (link->network->dhcp_use_dns &&
3641 link->dhcp_lease) {
3642 const struct in_addr *addresses;
3643
3644 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3645 if (r > 0) {
3646 if (space)
3647 fputc(' ', f);
3648 serialize_in_addrs(f, addresses, r);
3649 space = true;
3650 }
3651 }
3652
3653 if (link->network->dhcp_use_dns && dhcp6_lease) {
3654 struct in6_addr *in6_addrs;
3655
3656 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3657 if (r > 0) {
3658 if (space)
3659 fputc(' ', f);
3660 serialize_in6_addrs(f, in6_addrs, r);
3661 space = true;
3662 }
3663 }
3664
3665 /* Make sure to flush out old entries before we use the NDISC data */
3666 ndisc_vacuum(link);
3667
3668 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3669 NDiscRDNSS *dd;
3670
3671 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3672 if (space)
3673 fputc(' ', f);
3674
3675 serialize_in6_addrs(f, &dd->address, 1);
3676 space = true;
3677 }
3678 }
3679
3680 fputc('\n', f);
3681
3682 fputs("NTP=", f);
3683 space = false;
3684 fputstrv(f, link->network->ntp, NULL, &space);
3685
3686 if (link->network->dhcp_use_ntp &&
3687 link->dhcp_lease) {
3688 const struct in_addr *addresses;
3689
3690 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3691 if (r > 0) {
3692 if (space)
3693 fputc(' ', f);
3694 serialize_in_addrs(f, addresses, r);
3695 space = true;
3696 }
3697 }
3698
3699 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3700 struct in6_addr *in6_addrs;
3701 char **hosts;
3702
3703 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3704 &in6_addrs);
3705 if (r > 0) {
3706 if (space)
3707 fputc(' ', f);
3708 serialize_in6_addrs(f, in6_addrs, r);
3709 space = true;
3710 }
3711
3712 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3713 if (r > 0)
3714 fputstrv(f, hosts, NULL, &space);
3715 }
3716
3717 fputc('\n', f);
3718
3719 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3720 if (link->dhcp_lease) {
3721 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3722 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3723 }
3724 if (dhcp6_lease)
3725 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3726 }
3727
3728 fputs("DOMAINS=", f);
3729 space = false;
3730 fputstrv(f, link->network->search_domains, NULL, &space);
3731
3732 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3733 NDiscDNSSL *dd;
3734
3735 if (dhcp_domainname)
3736 fputs_with_space(f, dhcp_domainname, NULL, &space);
3737 if (dhcp_domains)
3738 fputstrv(f, dhcp_domains, NULL, &space);
3739 if (dhcp6_domains)
3740 fputstrv(f, dhcp6_domains, NULL, &space);
3741
3742 SET_FOREACH(dd, link->ndisc_dnssl, i)
3743 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3744 }
3745
3746 fputc('\n', f);
3747
3748 fputs("ROUTE_DOMAINS=", f);
3749 space = false;
3750 fputstrv(f, link->network->route_domains, NULL, &space);
3751
3752 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3753 NDiscDNSSL *dd;
3754
3755 if (dhcp_domainname)
3756 fputs_with_space(f, dhcp_domainname, NULL, &space);
3757 if (dhcp_domains)
3758 fputstrv(f, dhcp_domains, NULL, &space);
3759 if (dhcp6_domains)
3760 fputstrv(f, dhcp6_domains, NULL, &space);
3761
3762 SET_FOREACH(dd, link->ndisc_dnssl, i)
3763 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3764 }
3765
3766 fputc('\n', f);
3767
3768 fprintf(f, "LLMNR=%s\n",
3769 resolve_support_to_string(link->network->llmnr));
3770 fprintf(f, "MDNS=%s\n",
3771 resolve_support_to_string(link->network->mdns));
3772
3773 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3774 fprintf(f, "DNS_OVER_TLS=%s\n",
3775 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
3776
3777 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3778 fprintf(f, "DNSSEC=%s\n",
3779 dnssec_mode_to_string(link->network->dnssec_mode));
3780
3781 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3782 const char *n;
3783
3784 fputs("DNSSEC_NTA=", f);
3785 space = false;
3786 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3787 fputs_with_space(f, n, NULL, &space);
3788 fputc('\n', f);
3789 }
3790
3791 fputs("ADDRESSES=", f);
3792 space = false;
3793 SET_FOREACH(a, link->addresses, i) {
3794 _cleanup_free_ char *address_str = NULL;
3795
3796 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3797 if (r < 0)
3798 goto fail;
3799
3800 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3801 space = true;
3802 }
3803 fputc('\n', f);
3804
3805 fputs("ROUTES=", f);
3806 space = false;
3807 SET_FOREACH(route, link->routes, i) {
3808 _cleanup_free_ char *route_str = NULL;
3809
3810 r = in_addr_to_string(route->family, &route->dst, &route_str);
3811 if (r < 0)
3812 goto fail;
3813
3814 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
3815 space ? " " : "", route_str,
3816 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3817 space = true;
3818 }
3819
3820 fputc('\n', f);
3821 }
3822
3823 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3824 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3825
3826 if (link->dhcp_lease) {
3827 struct in_addr address;
3828 const char *tz = NULL;
3829
3830 assert(link->network);
3831
3832 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3833 if (r >= 0)
3834 fprintf(f, "TIMEZONE=%s\n", tz);
3835
3836 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3837 if (r >= 0) {
3838 fputs("DHCP4_ADDRESS=", f);
3839 serialize_in_addrs(f, &address, 1);
3840 fputc('\n', f);
3841 }
3842
3843 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3844 if (r < 0)
3845 goto fail;
3846
3847 fprintf(f,
3848 "DHCP_LEASE=%s\n",
3849 link->lease_file);
3850 } else
3851 unlink(link->lease_file);
3852
3853 if (link->ipv4ll) {
3854 struct in_addr address;
3855
3856 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3857 if (r >= 0) {
3858 fputs("IPV4LL_ADDRESS=", f);
3859 serialize_in_addrs(f, &address, 1);
3860 fputc('\n', f);
3861 }
3862 }
3863
3864 r = fflush_and_check(f);
3865 if (r < 0)
3866 goto fail;
3867
3868 if (rename(temp_path, link->state_file) < 0) {
3869 r = -errno;
3870 goto fail;
3871 }
3872
3873 return 0;
3874
3875 fail:
3876 (void) unlink(link->state_file);
3877 if (temp_path)
3878 (void) unlink(temp_path);
3879
3880 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3881 }
3882
3883 /* The serialized state in /run is no longer up-to-date. */
3884 void link_dirty(Link *link) {
3885 int r;
3886
3887 assert(link);
3888
3889 /* mark manager dirty as link is dirty */
3890 manager_dirty(link->manager);
3891
3892 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3893 if (r < 0)
3894 /* allocation errors are ignored */
3895 return;
3896
3897 r = set_put(link->manager->dirty_links, link);
3898 if (r <= 0)
3899 /* don't take another ref if the link was already dirty */
3900 return;
3901
3902 link_ref(link);
3903 }
3904
3905 /* The serialized state in /run is up-to-date */
3906 void link_clean(Link *link) {
3907 assert(link);
3908 assert(link->manager);
3909
3910 set_remove(link->manager->dirty_links, link);
3911 link_unref(link);
3912 }
3913
3914 static const char* const link_state_table[_LINK_STATE_MAX] = {
3915 [LINK_STATE_PENDING] = "pending",
3916 [LINK_STATE_ENSLAVING] = "configuring",
3917 [LINK_STATE_SETTING_ADDRESSES] = "configuring",
3918 [LINK_STATE_SETTING_ROUTES] = "configuring",
3919 [LINK_STATE_CONFIGURED] = "configured",
3920 [LINK_STATE_UNMANAGED] = "unmanaged",
3921 [LINK_STATE_FAILED] = "failed",
3922 [LINK_STATE_LINGER] = "linger",
3923 };
3924
3925 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
3926
3927 static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
3928 [LINK_OPERSTATE_OFF] = "off",
3929 [LINK_OPERSTATE_NO_CARRIER] = "no-carrier",
3930 [LINK_OPERSTATE_DORMANT] = "dormant",
3931 [LINK_OPERSTATE_CARRIER] = "carrier",
3932 [LINK_OPERSTATE_DEGRADED] = "degraded",
3933 [LINK_OPERSTATE_ROUTABLE] = "routable",
3934 };
3935
3936 DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
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