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Merge pull request #6948 from pfl/radv_emit_dns
[thirdparty/systemd.git] / src / network / networkd-link.c
1 /***
2 This file is part of systemd.
3
4 Copyright 2013 Tom Gundersen <teg@jklm.no>
5
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
10
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
18 ***/
19
20 #include <netinet/ether.h>
21 #include <linux/if.h>
22 #include <unistd.h>
23
24 #include "alloc-util.h"
25 #include "bus-util.h"
26 #include "dhcp-lease-internal.h"
27 #include "fd-util.h"
28 #include "fileio.h"
29 #include "netlink-util.h"
30 #include "network-internal.h"
31 #include "networkd-ipv6-proxy-ndp.h"
32 #include "networkd-lldp-tx.h"
33 #include "networkd-manager.h"
34 #include "networkd-ndisc.h"
35 #include "networkd-radv.h"
36 #include "networkd-routing-policy-rule.h"
37 #include "set.h"
38 #include "socket-util.h"
39 #include "stdio-util.h"
40 #include "string-table.h"
41 #include "udev-util.h"
42 #include "util.h"
43 #include "virt.h"
44
45 static bool link_dhcp6_enabled(Link *link) {
46 assert(link);
47
48 if (!socket_ipv6_is_supported())
49 return false;
50
51 if (link->flags & IFF_LOOPBACK)
52 return false;
53
54 if (!link->network)
55 return false;
56
57 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
58 }
59
60 static bool link_dhcp4_enabled(Link *link) {
61 assert(link);
62
63 if (link->flags & IFF_LOOPBACK)
64 return false;
65
66 if (!link->network)
67 return false;
68
69 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
70 }
71
72 static bool link_dhcp4_server_enabled(Link *link) {
73 assert(link);
74
75 if (link->flags & IFF_LOOPBACK)
76 return false;
77
78 if (!link->network)
79 return false;
80
81 return link->network->dhcp_server;
82 }
83
84 static bool link_ipv4ll_enabled(Link *link) {
85 assert(link);
86
87 if (link->flags & IFF_LOOPBACK)
88 return false;
89
90 if (!link->network)
91 return false;
92
93 return link->network->link_local & ADDRESS_FAMILY_IPV4;
94 }
95
96 static bool link_ipv6ll_enabled(Link *link) {
97 assert(link);
98
99 if (!socket_ipv6_is_supported())
100 return false;
101
102 if (link->flags & IFF_LOOPBACK)
103 return false;
104
105 if (!link->network)
106 return false;
107
108 return link->network->link_local & ADDRESS_FAMILY_IPV6;
109 }
110
111 static bool link_ipv6_enabled(Link *link) {
112 assert(link);
113
114 if (!socket_ipv6_is_supported())
115 return false;
116
117 if (link->network->bridge)
118 return false;
119
120 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
121 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
122 }
123
124 static bool link_radv_enabled(Link *link) {
125 assert(link);
126
127 if (!link_ipv6ll_enabled(link))
128 return false;
129
130 return link->network->router_prefix_delegation;
131 }
132
133 static bool link_lldp_rx_enabled(Link *link) {
134 assert(link);
135
136 if (link->flags & IFF_LOOPBACK)
137 return false;
138
139 if (link->iftype != ARPHRD_ETHER)
140 return false;
141
142 if (!link->network)
143 return false;
144
145 /* LLDP should be handled on bridge slaves as those have a direct
146 * connection to their peers not on the bridge master. Linux doesn't
147 * even (by default) forward lldp packets to the bridge master.*/
148 if (streq_ptr("bridge", link->kind))
149 return false;
150
151 return link->network->lldp_mode != LLDP_MODE_NO;
152 }
153
154 static bool link_lldp_emit_enabled(Link *link) {
155 assert(link);
156
157 if (link->flags & IFF_LOOPBACK)
158 return false;
159
160 if (link->iftype != ARPHRD_ETHER)
161 return false;
162
163 if (!link->network)
164 return false;
165
166 return link->network->lldp_emit != LLDP_EMIT_NO;
167 }
168
169 static bool link_ipv4_forward_enabled(Link *link) {
170 assert(link);
171
172 if (link->flags & IFF_LOOPBACK)
173 return false;
174
175 if (!link->network)
176 return false;
177
178 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
179 return false;
180
181 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
182 }
183
184 static bool link_ipv6_forward_enabled(Link *link) {
185 assert(link);
186
187 if (!socket_ipv6_is_supported())
188 return false;
189
190 if (link->flags & IFF_LOOPBACK)
191 return false;
192
193 if (!link->network)
194 return false;
195
196 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
197 return false;
198
199 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
200 }
201
202 static bool link_proxy_arp_enabled(Link *link) {
203 assert(link);
204
205 if (link->flags & IFF_LOOPBACK)
206 return false;
207
208 if (!link->network)
209 return false;
210
211 if (link->network->proxy_arp < 0)
212 return false;
213
214 return true;
215 }
216
217 static bool link_ipv6_accept_ra_enabled(Link *link) {
218 assert(link);
219
220 if (!socket_ipv6_is_supported())
221 return false;
222
223 if (link->flags & IFF_LOOPBACK)
224 return false;
225
226 if (!link->network)
227 return false;
228
229 if (!link_ipv6ll_enabled(link))
230 return false;
231
232 /* If unset use system default (enabled if local forwarding is disabled.
233 * disabled if local forwarding is enabled).
234 * If set, ignore or enforce RA independent of local forwarding state.
235 */
236 if (link->network->ipv6_accept_ra < 0)
237 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
238 return !link_ipv6_forward_enabled(link);
239 else if (link->network->ipv6_accept_ra > 0)
240 /* accept RA even if ip_forward is enabled */
241 return true;
242 else
243 /* ignore RA */
244 return false;
245 }
246
247 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
248 assert(link);
249
250 if (!socket_ipv6_is_supported())
251 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
252
253 if (link->flags & IFF_LOOPBACK)
254 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
255
256 if (!link->network)
257 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
258
259 return link->network->ipv6_privacy_extensions;
260 }
261
262 static int link_enable_ipv6(Link *link) {
263 const char *p = NULL;
264 bool disabled;
265 int r;
266
267 if (link->flags & IFF_LOOPBACK)
268 return 0;
269
270 disabled = !link_ipv6_enabled(link);
271
272 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/disable_ipv6");
273
274 r = write_string_file(p, one_zero(disabled), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
275 if (r < 0)
276 log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m",
277 enable_disable(!disabled), link->ifname);
278 else
279 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
280
281 return 0;
282 }
283
284 void link_update_operstate(Link *link) {
285 LinkOperationalState operstate;
286 assert(link);
287
288 if (link->kernel_operstate == IF_OPER_DORMANT)
289 operstate = LINK_OPERSTATE_DORMANT;
290 else if (link_has_carrier(link)) {
291 Address *address;
292 uint8_t scope = RT_SCOPE_NOWHERE;
293 Iterator i;
294
295 /* if we have carrier, check what addresses we have */
296 SET_FOREACH(address, link->addresses, i) {
297 if (!address_is_ready(address))
298 continue;
299
300 if (address->scope < scope)
301 scope = address->scope;
302 }
303
304 /* for operstate we also take foreign addresses into account */
305 SET_FOREACH(address, link->addresses_foreign, i) {
306 if (!address_is_ready(address))
307 continue;
308
309 if (address->scope < scope)
310 scope = address->scope;
311 }
312
313 if (scope < RT_SCOPE_SITE)
314 /* universally accessible addresses found */
315 operstate = LINK_OPERSTATE_ROUTABLE;
316 else if (scope < RT_SCOPE_HOST)
317 /* only link or site local addresses found */
318 operstate = LINK_OPERSTATE_DEGRADED;
319 else
320 /* no useful addresses found */
321 operstate = LINK_OPERSTATE_CARRIER;
322 } else if (link->flags & IFF_UP)
323 operstate = LINK_OPERSTATE_NO_CARRIER;
324 else
325 operstate = LINK_OPERSTATE_OFF;
326
327 if (link->operstate != operstate) {
328 link->operstate = operstate;
329 link_send_changed(link, "OperationalState", NULL);
330 link_dirty(link);
331 }
332 }
333
334 #define FLAG_STRING(string, flag, old, new) \
335 (((old ^ new) & flag) \
336 ? ((old & flag) ? (" -" string) : (" +" string)) \
337 : "")
338
339 static int link_update_flags(Link *link, sd_netlink_message *m) {
340 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
341 uint8_t operstate;
342 int r;
343
344 assert(link);
345
346 r = sd_rtnl_message_link_get_flags(m, &flags);
347 if (r < 0)
348 return log_link_warning_errno(link, r, "Could not get link flags: %m");
349
350 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
351 if (r < 0)
352 /* if we got a message without operstate, take it to mean
353 the state was unchanged */
354 operstate = link->kernel_operstate;
355
356 if ((link->flags == flags) && (link->kernel_operstate == operstate))
357 return 0;
358
359 if (link->flags != flags) {
360 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",
361 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
362 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
363 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
364 FLAG_STRING("UP", IFF_UP, link->flags, flags),
365 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
366 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
367 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
368 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
369 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
370 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
371 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
372 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
373 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
374 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
375 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
376 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
377 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
378 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
379 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
380
381 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
382 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
383 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
384 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
385 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
386 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
387 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
388 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
389
390 /* link flags are currently at most 18 bits, let's align to
391 * printing 20 */
392 if (unknown_flags_added)
393 log_link_debug(link,
394 "Unknown link flags gained: %#.5x (ignoring)",
395 unknown_flags_added);
396
397 if (unknown_flags_removed)
398 log_link_debug(link,
399 "Unknown link flags lost: %#.5x (ignoring)",
400 unknown_flags_removed);
401 }
402
403 link->flags = flags;
404 link->kernel_operstate = operstate;
405
406 link_update_operstate(link);
407
408 return 0;
409 }
410
411 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
412 _cleanup_link_unref_ Link *link = NULL;
413 uint16_t type;
414 const char *ifname, *kind = NULL;
415 int r, ifindex;
416 unsigned short iftype;
417
418 assert(manager);
419 assert(message);
420 assert(ret);
421
422 /* check for link kind */
423 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
424 if (r == 0) {
425 (void)sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
426 r = sd_netlink_message_exit_container(message);
427 if (r < 0)
428 return r;
429 }
430
431 r = sd_netlink_message_get_type(message, &type);
432 if (r < 0)
433 return r;
434 else if (type != RTM_NEWLINK)
435 return -EINVAL;
436
437 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
438 if (r < 0)
439 return r;
440 else if (ifindex <= 0)
441 return -EINVAL;
442
443 r = sd_rtnl_message_link_get_type(message, &iftype);
444 if (r < 0)
445 return r;
446
447 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
448 if (r < 0)
449 return r;
450
451 link = new0(Link, 1);
452 if (!link)
453 return -ENOMEM;
454
455 link->n_ref = 1;
456 link->manager = manager;
457 link->state = LINK_STATE_PENDING;
458 link->rtnl_extended_attrs = true;
459 link->ifindex = ifindex;
460 link->iftype = iftype;
461 link->ifname = strdup(ifname);
462 if (!link->ifname)
463 return -ENOMEM;
464
465 if (kind) {
466 link->kind = strdup(kind);
467 if (!link->kind)
468 return -ENOMEM;
469 }
470
471 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
472 if (r < 0)
473 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
474
475 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
476 return -ENOMEM;
477
478 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
479 return -ENOMEM;
480
481 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
482 return -ENOMEM;
483
484 r = hashmap_ensure_allocated(&manager->links, NULL);
485 if (r < 0)
486 return r;
487
488 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
489 if (r < 0)
490 return r;
491
492 r = link_update_flags(link, message);
493 if (r < 0)
494 return r;
495
496 *ret = link;
497 link = NULL;
498
499 return 0;
500 }
501
502 static void link_free(Link *link) {
503 Address *address;
504 Link *carrier;
505 Iterator i;
506
507 if (!link)
508 return;
509
510 while (!set_isempty(link->addresses))
511 address_free(set_first(link->addresses));
512
513 while (!set_isempty(link->addresses_foreign))
514 address_free(set_first(link->addresses_foreign));
515
516 link->addresses = set_free(link->addresses);
517
518 link->addresses_foreign = set_free(link->addresses_foreign);
519
520 while ((address = link->pool_addresses)) {
521 LIST_REMOVE(addresses, link->pool_addresses, address);
522 address_free(address);
523 }
524
525 sd_dhcp_server_unref(link->dhcp_server);
526 sd_dhcp_client_unref(link->dhcp_client);
527 sd_dhcp_lease_unref(link->dhcp_lease);
528
529 link_lldp_emit_stop(link);
530
531 free(link->lease_file);
532
533 sd_lldp_unref(link->lldp);
534 free(link->lldp_file);
535
536 ndisc_flush(link);
537
538 sd_ipv4ll_unref(link->ipv4ll);
539 sd_dhcp6_client_unref(link->dhcp6_client);
540 sd_ndisc_unref(link->ndisc);
541 sd_radv_unref(link->radv);
542
543 if (link->manager)
544 hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex));
545
546 free(link->ifname);
547
548 free(link->kind);
549
550 (void)unlink(link->state_file);
551 free(link->state_file);
552
553 udev_device_unref(link->udev_device);
554
555 HASHMAP_FOREACH (carrier, link->bound_to_links, i)
556 hashmap_remove(link->bound_to_links, INT_TO_PTR(carrier->ifindex));
557 hashmap_free(link->bound_to_links);
558
559 HASHMAP_FOREACH (carrier, link->bound_by_links, i)
560 hashmap_remove(link->bound_by_links, INT_TO_PTR(carrier->ifindex));
561 hashmap_free(link->bound_by_links);
562
563 free(link);
564 }
565
566 Link *link_unref(Link *link) {
567 if (!link)
568 return NULL;
569
570 assert(link->n_ref > 0);
571
572 link->n_ref--;
573
574 if (link->n_ref > 0)
575 return NULL;
576
577 link_free(link);
578
579 return NULL;
580 }
581
582 Link *link_ref(Link *link) {
583 if (!link)
584 return NULL;
585
586 assert(link->n_ref > 0);
587
588 link->n_ref++;
589
590 return link;
591 }
592
593 int link_get(Manager *m, int ifindex, Link **ret) {
594 Link *link;
595
596 assert(m);
597 assert(ifindex);
598 assert(ret);
599
600 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
601 if (!link)
602 return -ENODEV;
603
604 *ret = link;
605
606 return 0;
607 }
608
609 static void link_set_state(Link *link, LinkState state) {
610 assert(link);
611
612 if (link->state == state)
613 return;
614
615 link->state = state;
616
617 link_send_changed(link, "AdministrativeState", NULL);
618 }
619
620 static void link_enter_unmanaged(Link *link) {
621 assert(link);
622
623 log_link_debug(link, "Unmanaged");
624
625 link_set_state(link, LINK_STATE_UNMANAGED);
626
627 link_dirty(link);
628 }
629
630 static int link_stop_clients(Link *link) {
631 int r = 0, k;
632
633 assert(link);
634 assert(link->manager);
635 assert(link->manager->event);
636
637 if (link->dhcp_client) {
638 k = sd_dhcp_client_stop(link->dhcp_client);
639 if (k < 0)
640 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
641 }
642
643 if (link->ipv4ll) {
644 k = sd_ipv4ll_stop(link->ipv4ll);
645 if (k < 0)
646 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
647 }
648
649 if (link->dhcp6_client) {
650 k = sd_dhcp6_client_stop(link->dhcp6_client);
651 if (k < 0)
652 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
653 }
654
655 if (link->ndisc) {
656 k = sd_ndisc_stop(link->ndisc);
657 if (k < 0)
658 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
659 }
660
661 if (link->radv) {
662 k = sd_radv_stop(link->radv);
663 if (k < 0)
664 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
665 }
666
667 link_lldp_emit_stop(link);
668 return r;
669 }
670
671 void link_enter_failed(Link *link) {
672 assert(link);
673
674 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
675 return;
676
677 log_link_warning(link, "Failed");
678
679 link_set_state(link, LINK_STATE_FAILED);
680
681 link_stop_clients(link);
682
683 link_dirty(link);
684 }
685
686 static Address* link_find_dhcp_server_address(Link *link) {
687 Address *address;
688
689 assert(link);
690 assert(link->network);
691
692 /* The first statically configured address if there is any */
693 LIST_FOREACH(addresses, address, link->network->static_addresses) {
694
695 if (address->family != AF_INET)
696 continue;
697
698 if (in_addr_is_null(address->family, &address->in_addr))
699 continue;
700
701 return address;
702 }
703
704 /* If that didn't work, find a suitable address we got from the pool */
705 LIST_FOREACH(addresses, address, link->pool_addresses) {
706 if (address->family != AF_INET)
707 continue;
708
709 return address;
710 }
711
712 return NULL;
713 }
714
715 static void link_enter_configured(Link *link) {
716 assert(link);
717 assert(link->network);
718
719 if (link->state != LINK_STATE_SETTING_ROUTES)
720 return;
721
722 log_link_info(link, "Configured");
723
724 link_set_state(link, LINK_STATE_CONFIGURED);
725
726 link_dirty(link);
727 }
728
729 void link_check_ready(Link *link) {
730 Address *a;
731 Iterator i;
732
733 assert(link);
734
735 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
736 return;
737
738 if (!link->network)
739 return;
740
741 if (!link->static_configured)
742 return;
743
744 if (link_ipv4ll_enabled(link))
745 if (!link->ipv4ll_address ||
746 !link->ipv4ll_route)
747 return;
748
749 if (link_ipv6ll_enabled(link))
750 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) > 0)
751 return;
752
753 if ((link_dhcp4_enabled(link) && !link_dhcp6_enabled(link) &&
754 !link->dhcp4_configured) ||
755 (link_dhcp6_enabled(link) && !link_dhcp4_enabled(link) &&
756 !link->dhcp6_configured) ||
757 (link_dhcp4_enabled(link) && link_dhcp6_enabled(link) &&
758 !link->dhcp4_configured && !link->dhcp6_configured))
759 return;
760
761 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
762 return;
763
764 SET_FOREACH(a, link->addresses, i)
765 if (!address_is_ready(a))
766 return;
767
768 if (link->state != LINK_STATE_CONFIGURED)
769 link_enter_configured(link);
770
771 return;
772 }
773
774 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
775 _cleanup_link_unref_ Link *link = userdata;
776 int r;
777
778 assert(link->link_messages > 0);
779 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
780 LINK_STATE_SETTING_ROUTES, LINK_STATE_FAILED,
781 LINK_STATE_LINGER));
782
783 link->link_messages--;
784
785 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
786 return 1;
787
788 r = sd_netlink_message_get_errno(m);
789 if (r < 0 && r != -EEXIST)
790 log_link_warning_errno(link, r, "Could not set route: %m");
791
792 if (link->link_messages == 0) {
793 log_link_debug(link, "Routes set");
794 link->static_configured = true;
795 link_check_ready(link);
796 }
797
798 return 1;
799 }
800
801 static int link_enter_set_routes(Link *link) {
802 Route *rt;
803 int r;
804
805 assert(link);
806 assert(link->network);
807 assert(link->state == LINK_STATE_SETTING_ADDRESSES);
808
809 link_set_state(link, LINK_STATE_SETTING_ROUTES);
810
811 LIST_FOREACH(routes, rt, link->network->static_routes) {
812 r = route_configure(rt, link, route_handler);
813 if (r < 0) {
814 log_link_warning_errno(link, r, "Could not set routes: %m");
815 link_enter_failed(link);
816 return r;
817 }
818
819 link->link_messages++;
820 }
821
822 if (link->link_messages == 0) {
823 link->static_configured = true;
824 link_check_ready(link);
825 } else
826 log_link_debug(link, "Setting routes");
827
828 return 0;
829 }
830
831 int link_route_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
832 _cleanup_link_unref_ Link *link = userdata;
833 int r;
834
835 assert(m);
836 assert(link);
837 assert(link->ifname);
838
839 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
840 return 1;
841
842 r = sd_netlink_message_get_errno(m);
843 if (r < 0 && r != -ESRCH)
844 log_link_warning_errno(link, r, "Could not drop route: %m");
845
846 return 1;
847 }
848
849 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
850 _cleanup_link_unref_ Link *link = userdata;
851 int r;
852
853 assert(rtnl);
854 assert(m);
855 assert(link);
856 assert(link->ifname);
857 assert(link->link_messages > 0);
858 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
859 LINK_STATE_FAILED, LINK_STATE_LINGER));
860
861 link->link_messages--;
862
863 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
864 return 1;
865
866 r = sd_netlink_message_get_errno(m);
867 if (r < 0 && r != -EEXIST)
868 log_link_warning_errno(link, r, "could not set address: %m");
869 else if (r >= 0)
870 manager_rtnl_process_address(rtnl, m, link->manager);
871
872 if (link->link_messages == 0) {
873 log_link_debug(link, "Addresses set");
874 link_enter_set_routes(link);
875 }
876
877 return 1;
878 }
879
880 static int address_label_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
881 _cleanup_link_unref_ Link *link = userdata;
882 int r;
883
884 assert(rtnl);
885 assert(m);
886 assert(link);
887 assert(link->ifname);
888 assert(link->link_messages > 0);
889
890 link->link_messages--;
891
892 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
893 return 1;
894
895 r = sd_netlink_message_get_errno(m);
896 if (r < 0 && r != -EEXIST)
897 log_link_warning_errno(link, r, "could not set address label: %m");
898 else if (r >= 0)
899 manager_rtnl_process_address(rtnl, m, link->manager);
900
901 if (link->link_messages == 0) {
902 log_link_debug(link, "Addresses label set");
903 link_enter_set_routes(link);
904 }
905
906 return 1;
907 }
908
909 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
910 _cleanup_free_ struct in_addr *addresses = NULL;
911 size_t n_addresses = 0, n_allocated = 0;
912 unsigned i;
913
914 log_debug("Copying DNS server information from %s", link->ifname);
915
916 if (!link->network)
917 return 0;
918
919 for (i = 0; i < link->network->n_dns; i++) {
920 struct in_addr ia;
921
922 /* Only look for IPv4 addresses */
923 if (link->network->dns[i].family != AF_INET)
924 continue;
925
926 ia = link->network->dns[i].address.in;
927
928 /* Never propagate obviously borked data */
929 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
930 continue;
931
932 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
933 return log_oom();
934
935 addresses[n_addresses++] = ia;
936 }
937
938 if (link->network->dhcp_use_dns && link->dhcp_lease) {
939 const struct in_addr *da = NULL;
940 int n;
941
942 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
943 if (n > 0) {
944
945 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
946 return log_oom();
947
948 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
949 n_addresses += n;
950 }
951 }
952
953 if (n_addresses <= 0)
954 return 0;
955
956 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
957 }
958
959 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
960 _cleanup_free_ struct in_addr *addresses = NULL;
961 size_t n_addresses = 0, n_allocated = 0;
962 char **a;
963
964 if (!link->network)
965 return 0;
966
967 log_debug("Copying NTP server information from %s", link->ifname);
968
969 STRV_FOREACH(a, link->network->ntp) {
970 struct in_addr ia;
971
972 /* Only look for IPv4 addresses */
973 if (inet_pton(AF_INET, *a, &ia) <= 0)
974 continue;
975
976 /* Never propagate obviously borked data */
977 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
978 continue;
979
980 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
981 return log_oom();
982
983 addresses[n_addresses++] = ia;
984 }
985
986 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
987 const struct in_addr *da = NULL;
988 int n;
989
990 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
991 if (n > 0) {
992
993 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
994 return log_oom();
995
996 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
997 n_addresses += n;
998 }
999 }
1000
1001 if (n_addresses <= 0)
1002 return 0;
1003
1004 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1005 }
1006
1007 static int link_set_bridge_fdb(Link *link) {
1008 FdbEntry *fdb_entry;
1009 int r;
1010
1011 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1012 r = fdb_entry_configure(link, fdb_entry);
1013 if (r < 0)
1014 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1015 }
1016
1017 return 0;
1018 }
1019
1020 static int link_enter_set_addresses(Link *link) {
1021 RoutingPolicyRule *rule, *rrule = NULL;
1022 AddressLabel *label;
1023 Address *ad;
1024 int r;
1025
1026 assert(link);
1027 assert(link->network);
1028 assert(link->state != _LINK_STATE_INVALID);
1029
1030 r = link_set_bridge_fdb(link);
1031 if (r < 0)
1032 return r;
1033
1034 link_set_state(link, LINK_STATE_SETTING_ADDRESSES);
1035
1036 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1037 r = address_configure(ad, link, address_handler, false);
1038 if (r < 0) {
1039 log_link_warning_errno(link, r, "Could not set addresses: %m");
1040 link_enter_failed(link);
1041 return r;
1042 }
1043
1044 link->link_messages++;
1045 }
1046
1047 LIST_FOREACH(labels, label, link->network->address_labels) {
1048 r = address_label_configure(label, link, address_label_handler, false);
1049 if (r < 0) {
1050 log_link_warning_errno(link, r, "Could not set address label: %m");
1051 link_enter_failed(link);
1052 return r;
1053 }
1054
1055 link->link_messages++;
1056 }
1057
1058 LIST_FOREACH(rules, rule, link->network->rules) {
1059 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
1060 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, &rrule);
1061 if (r == 1) {
1062 (void) routing_policy_rule_make_local(link->manager, rrule);
1063 continue;
1064 }
1065
1066 r = routing_policy_rule_configure(rule, link, link_routing_policy_rule_handler, false);
1067 if (r < 0) {
1068 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
1069 link_enter_failed(link);
1070 return r;
1071 }
1072
1073 link->link_messages++;
1074 }
1075
1076 routing_policy_rule_purge(link->manager, link);
1077
1078 /* now that we can figure out a default address for the dhcp server,
1079 start it */
1080 if (link_dhcp4_server_enabled(link)) {
1081 Address *address;
1082 Link *uplink = NULL;
1083 bool acquired_uplink = false;
1084
1085 address = link_find_dhcp_server_address(link);
1086 if (!address) {
1087 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1088 link_enter_failed(link);
1089 return 0;
1090 }
1091
1092 /* use the server address' subnet as the pool */
1093 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1094 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1095 if (r < 0)
1096 return r;
1097
1098 /* TODO:
1099 r = sd_dhcp_server_set_router(link->dhcp_server,
1100 &main_address->in_addr.in);
1101 if (r < 0)
1102 return r;
1103 */
1104
1105 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1106 r = sd_dhcp_server_set_max_lease_time(
1107 link->dhcp_server,
1108 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1109 if (r < 0)
1110 return r;
1111 }
1112
1113 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1114 r = sd_dhcp_server_set_default_lease_time(
1115 link->dhcp_server,
1116 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1117 if (r < 0)
1118 return r;
1119 }
1120
1121 if (link->network->dhcp_server_emit_dns) {
1122
1123 if (link->network->n_dhcp_server_dns > 0)
1124 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1125 else {
1126 uplink = manager_find_uplink(link->manager, link);
1127 acquired_uplink = true;
1128
1129 if (!uplink) {
1130 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1131 r = 0;
1132 } else
1133 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1134 }
1135 if (r < 0)
1136 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1137 }
1138
1139
1140 if (link->network->dhcp_server_emit_ntp) {
1141
1142 if (link->network->n_dhcp_server_ntp > 0)
1143 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1144 else {
1145 if (!acquired_uplink)
1146 uplink = manager_find_uplink(link->manager, link);
1147
1148 if (!uplink) {
1149 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1150 r = 0;
1151 } else
1152 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1153
1154 }
1155 if (r < 0)
1156 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1157 }
1158
1159 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1160 if (r < 0) {
1161 log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1162 return r;
1163 }
1164
1165 if (link->network->dhcp_server_emit_timezone) {
1166 _cleanup_free_ char *buffer = NULL;
1167 const char *tz = NULL;
1168
1169 if (link->network->dhcp_server_timezone)
1170 tz = link->network->dhcp_server_timezone;
1171 else {
1172 r = get_timezone(&buffer);
1173 if (r < 0)
1174 log_warning_errno(r, "Failed to determine timezone: %m");
1175 else
1176 tz = buffer;
1177 }
1178
1179 if (tz) {
1180 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1181 if (r < 0)
1182 return r;
1183 }
1184 }
1185
1186 r = sd_dhcp_server_start(link->dhcp_server);
1187 if (r < 0) {
1188 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1189
1190 link_enter_failed(link);
1191
1192 return 0;
1193 }
1194
1195 log_link_debug(link, "Offering DHCPv4 leases");
1196 }
1197
1198 if (link->link_messages == 0)
1199 link_enter_set_routes(link);
1200 else
1201 log_link_debug(link, "Setting addresses");
1202
1203 return 0;
1204 }
1205
1206 int link_address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1207 _cleanup_link_unref_ Link *link = userdata;
1208 int r;
1209
1210 assert(m);
1211 assert(link);
1212 assert(link->ifname);
1213
1214 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1215 return 1;
1216
1217 r = sd_netlink_message_get_errno(m);
1218 if (r < 0 && r != -EADDRNOTAVAIL)
1219 log_link_warning_errno(link, r, "Could not drop address: %m");
1220
1221 return 1;
1222 }
1223
1224 static int link_set_bridge_vlan(Link *link) {
1225 int r = 0;
1226
1227 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1228 if (r < 0)
1229 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1230
1231 return r;
1232 }
1233
1234 static int link_set_proxy_arp(Link *link) {
1235 const char *p = NULL;
1236 int r;
1237
1238 if (!link_proxy_arp_enabled(link))
1239 return 0;
1240
1241 p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/proxy_arp");
1242
1243 r = write_string_file(p, one_zero(link->network->proxy_arp), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
1244 if (r < 0)
1245 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1246
1247 return 0;
1248 }
1249
1250 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1251 _cleanup_link_unref_ Link *link = userdata;
1252 int r;
1253
1254 log_link_debug(link, "Set link");
1255
1256 r = sd_netlink_message_get_errno(m);
1257 if (r < 0 && r != -EEXIST) {
1258 log_link_error_errno(link, r, "Could not join netdev: %m");
1259 link_enter_failed(link);
1260 return 1;
1261 }
1262
1263 return 0;
1264 }
1265
1266 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1267 _cleanup_link_unref_ Link *link = userdata;
1268 int r;
1269
1270 assert(m);
1271 assert(link);
1272 assert(link->ifname);
1273
1274 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1275 return 1;
1276
1277 r = sd_netlink_message_get_errno(m);
1278 if (r < 0)
1279 log_link_warning_errno(link, r, "Could not set MTU: %m");
1280
1281 return 1;
1282 }
1283
1284 int link_set_mtu(Link *link, uint32_t mtu) {
1285 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1286 int r;
1287
1288 assert(link);
1289 assert(link->manager);
1290 assert(link->manager->rtnl);
1291
1292 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1293
1294 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1295 if (r < 0)
1296 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1297
1298 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1299 if (r < 0)
1300 return log_link_error_errno(link, r, "Could not append MTU: %m");
1301
1302 r = sd_netlink_call_async(link->manager->rtnl, req, set_mtu_handler, link, 0, NULL);
1303 if (r < 0)
1304 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1305
1306 link_ref(link);
1307
1308 return 0;
1309 }
1310
1311 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1312 _cleanup_link_unref_ Link *link = userdata;
1313 int r;
1314
1315 assert(m);
1316 assert(link);
1317 assert(link->ifname);
1318
1319 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1320 return 1;
1321
1322 r = sd_netlink_message_get_errno(m);
1323 if (r < 0)
1324 log_link_warning_errno(link, r, "Could not set link flags: %m");
1325
1326 return 1;
1327 }
1328
1329 static int link_set_flags(Link *link) {
1330 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1331 unsigned ifi_change = 0;
1332 unsigned ifi_flags = 0;
1333 int r;
1334
1335 assert(link);
1336 assert(link->manager);
1337 assert(link->manager->rtnl);
1338
1339 if (link->flags & IFF_LOOPBACK)
1340 return 0;
1341
1342 if (!link->network)
1343 return 0;
1344
1345 if (link->network->arp < 0)
1346 return 0;
1347
1348 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1349 if (r < 0)
1350 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1351
1352 if (link->network->arp >= 0) {
1353 ifi_change |= IFF_NOARP;
1354 ifi_flags |= link->network->arp ? 0 : IFF_NOARP;
1355 }
1356
1357 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1358 if (r < 0)
1359 return log_link_error_errno(link, r, "Could not set link flags: %m");
1360
1361 r = sd_netlink_call_async(link->manager->rtnl, req, set_flags_handler, link, 0, NULL);
1362 if (r < 0)
1363 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1364
1365 link_ref(link);
1366
1367 return 0;
1368 }
1369
1370 static int link_set_bridge(Link *link) {
1371 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1372 int r;
1373
1374 assert(link);
1375 assert(link->network);
1376
1377 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1378 if (r < 0)
1379 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1380
1381 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1382 if (r < 0)
1383 return log_link_error_errno(link, r, "Could not set message family: %m");
1384
1385 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1386 if (r < 0)
1387 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1388
1389 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, !link->network->use_bpdu);
1390 if (r < 0)
1391 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1392
1393 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1394 if (r < 0)
1395 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1396
1397 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1398 if (r < 0)
1399 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1400
1401 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, !link->network->allow_port_to_be_root);
1402 if (r < 0)
1403 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1404
1405 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1406 if (r < 0)
1407 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1408
1409 if (link->network->cost != 0) {
1410 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1411 if (r < 0)
1412 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1413 }
1414 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1415 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1416 if (r < 0)
1417 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1418 }
1419
1420 r = sd_netlink_message_close_container(req);
1421 if (r < 0)
1422 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1423
1424 r = sd_netlink_call_async(link->manager->rtnl, req, link_set_handler, link, 0, NULL);
1425 if (r < 0)
1426 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1427
1428 link_ref(link);
1429
1430 return r;
1431 }
1432
1433 static int link_bond_set(Link *link) {
1434 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1435 int r;
1436
1437 assert(link);
1438 assert(link->network);
1439
1440 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1441 if (r < 0)
1442 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1443
1444 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1445 if (r < 0)
1446 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1447
1448 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1449 if (r < 0)
1450 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1451
1452 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1453 if (r < 0)
1454 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1455
1456 if (link->network->active_slave) {
1457 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1458 if (r < 0)
1459 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1460 }
1461
1462 if (link->network->primary_slave) {
1463 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1464 if (r < 0)
1465 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1466 }
1467
1468 r = sd_netlink_message_close_container(req);
1469 if (r < 0)
1470 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1471
1472 r = sd_netlink_message_close_container(req);
1473 if (r < 0)
1474 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1475
1476 r = sd_netlink_call_async(link->manager->rtnl, req, set_flags_handler, link, 0, NULL);
1477 if (r < 0)
1478 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1479
1480 link_ref(link);
1481
1482 return r;
1483 }
1484
1485 static int link_lldp_save(Link *link) {
1486 _cleanup_free_ char *temp_path = NULL;
1487 _cleanup_fclose_ FILE *f = NULL;
1488 sd_lldp_neighbor **l = NULL;
1489 int n = 0, r, i;
1490
1491 assert(link);
1492 assert(link->lldp_file);
1493
1494 if (!link->lldp) {
1495 (void) unlink(link->lldp_file);
1496 return 0;
1497 }
1498
1499 r = sd_lldp_get_neighbors(link->lldp, &l);
1500 if (r < 0)
1501 goto finish;
1502 if (r == 0) {
1503 (void) unlink(link->lldp_file);
1504 goto finish;
1505 }
1506
1507 n = r;
1508
1509 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1510 if (r < 0)
1511 goto finish;
1512
1513 fchmod(fileno(f), 0644);
1514
1515 for (i = 0; i < n; i++) {
1516 const void *p;
1517 le64_t u;
1518 size_t sz;
1519
1520 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1521 if (r < 0)
1522 goto finish;
1523
1524 u = htole64(sz);
1525 (void) fwrite(&u, 1, sizeof(u), f);
1526 (void) fwrite(p, 1, sz, f);
1527 }
1528
1529 r = fflush_and_check(f);
1530 if (r < 0)
1531 goto finish;
1532
1533 if (rename(temp_path, link->lldp_file) < 0) {
1534 r = -errno;
1535 goto finish;
1536 }
1537
1538 finish:
1539 if (r < 0) {
1540 (void) unlink(link->lldp_file);
1541 if (temp_path)
1542 (void) unlink(temp_path);
1543
1544 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1545 }
1546
1547 if (l) {
1548 for (i = 0; i < n; i++)
1549 sd_lldp_neighbor_unref(l[i]);
1550 free(l);
1551 }
1552
1553 return r;
1554 }
1555
1556 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1557 Link *link = userdata;
1558 int r;
1559
1560 assert(link);
1561
1562 (void) link_lldp_save(link);
1563
1564 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1565 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1566
1567 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1568
1569 r = link_lldp_emit_start(link);
1570 if (r < 0)
1571 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1572 }
1573 }
1574
1575 static int link_acquire_ipv6_conf(Link *link) {
1576 int r;
1577
1578 assert(link);
1579
1580 if (link_dhcp6_enabled(link)) {
1581 assert(link->dhcp6_client);
1582 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1583
1584 /* start DHCPv6 client in stateless mode */
1585 r = dhcp6_request_address(link, true);
1586 if (r < 0 && r != -EBUSY)
1587 return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m");
1588 else
1589 log_link_debug(link, "Acquiring DHCPv6 lease");
1590 }
1591
1592 if (link_ipv6_accept_ra_enabled(link)) {
1593 assert(link->ndisc);
1594
1595 log_link_debug(link, "Discovering IPv6 routers");
1596
1597 r = sd_ndisc_start(link->ndisc);
1598 if (r < 0 && r != -EBUSY)
1599 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1600 }
1601
1602 if (link_radv_enabled(link)) {
1603 assert(link->radv);
1604 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1605
1606 log_link_debug(link, "Starting IPv6 Router Advertisements");
1607
1608 r = sd_radv_start(link->radv);
1609 if (r < 0 && r != -EBUSY)
1610 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1611 }
1612
1613 return 0;
1614 }
1615
1616 static int link_acquire_ipv4_conf(Link *link) {
1617 int r;
1618
1619 assert(link);
1620 assert(link->network);
1621 assert(link->manager);
1622 assert(link->manager->event);
1623
1624 if (link_ipv4ll_enabled(link)) {
1625 assert(link->ipv4ll);
1626
1627 log_link_debug(link, "Acquiring IPv4 link-local address");
1628
1629 r = sd_ipv4ll_start(link->ipv4ll);
1630 if (r < 0)
1631 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1632 }
1633
1634 if (link_dhcp4_enabled(link)) {
1635 assert(link->dhcp_client);
1636
1637 log_link_debug(link, "Acquiring DHCPv4 lease");
1638
1639 r = sd_dhcp_client_start(link->dhcp_client);
1640 if (r < 0)
1641 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1642 }
1643
1644 return 0;
1645 }
1646
1647 static int link_acquire_conf(Link *link) {
1648 int r;
1649
1650 assert(link);
1651
1652 r = link_acquire_ipv4_conf(link);
1653 if (r < 0)
1654 return r;
1655
1656 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) == 0) {
1657 r = link_acquire_ipv6_conf(link);
1658 if (r < 0)
1659 return r;
1660 }
1661
1662 if (link_lldp_emit_enabled(link)) {
1663 r = link_lldp_emit_start(link);
1664 if (r < 0)
1665 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1666 }
1667
1668 return 0;
1669 }
1670
1671 bool link_has_carrier(Link *link) {
1672 /* see Documentation/networking/operstates.txt in the kernel sources */
1673
1674 if (link->kernel_operstate == IF_OPER_UP)
1675 return true;
1676
1677 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1678 /* operstate may not be implemented, so fall back to flags */
1679 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1680 return true;
1681
1682 return false;
1683 }
1684
1685 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1686 _cleanup_link_unref_ Link *link = userdata;
1687 int r;
1688
1689 assert(link);
1690
1691 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1692 return 1;
1693
1694 r = sd_netlink_message_get_errno(m);
1695 if (r < 0)
1696 /* we warn but don't fail the link, as it may be
1697 brought up later */
1698 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1699
1700 return 1;
1701 }
1702
1703 int link_up(Link *link) {
1704 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1705 uint8_t ipv6ll_mode;
1706 int r;
1707
1708 assert(link);
1709 assert(link->network);
1710 assert(link->manager);
1711 assert(link->manager->rtnl);
1712
1713 log_link_debug(link, "Bringing link up");
1714
1715 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1716 if (r < 0)
1717 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1718
1719 /* set it free if not enslaved with networkd */
1720 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1721 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1722 if (r < 0)
1723 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1724 }
1725
1726 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1727 if (r < 0)
1728 return log_link_error_errno(link, r, "Could not set link flags: %m");
1729
1730 if (link->network->mac) {
1731 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1732 if (r < 0)
1733 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1734 }
1735
1736 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1737 for this interface, or if it is a bridge slave, then disable IPv6 else enable it. */
1738 (void) link_enable_ipv6(link);
1739
1740 if (link->network->mtu) {
1741 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1742 on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1743 if (link_ipv6_enabled(link) && link->network->mtu < IPV6_MIN_MTU) {
1744
1745 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1746 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1747
1748 link->network->mtu = IPV6_MIN_MTU;
1749 }
1750
1751 r = sd_netlink_message_append_u32(req, IFLA_MTU, link->network->mtu);
1752 if (r < 0)
1753 return log_link_error_errno(link, r, "Could not set MTU: %m");
1754 }
1755
1756 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1757 if (r < 0)
1758 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1759
1760 if (link_ipv6_enabled(link)) {
1761 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
1762 r = sd_netlink_message_open_container(req, AF_INET6);
1763 if (r < 0)
1764 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1765
1766 if (!link_ipv6ll_enabled(link))
1767 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1768 else {
1769 const char *p = NULL;
1770 _cleanup_free_ char *stable_secret = NULL;
1771
1772 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/stable_secret");
1773 r = read_one_line_file(p, &stable_secret);
1774
1775 if (r < 0)
1776 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1777 else
1778 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1779 }
1780 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1781 if (r < 0)
1782 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1783
1784 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
1785 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
1786 if (r < 0)
1787 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
1788 }
1789
1790 r = sd_netlink_message_close_container(req);
1791 if (r < 0)
1792 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1793 }
1794
1795 r = sd_netlink_message_close_container(req);
1796 if (r < 0)
1797 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1798
1799 r = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
1800 if (r < 0)
1801 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1802
1803 link_ref(link);
1804
1805 return 0;
1806 }
1807
1808 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1809 _cleanup_link_unref_ Link *link = userdata;
1810 int r;
1811
1812 assert(link);
1813
1814 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1815 return 1;
1816
1817 r = sd_netlink_message_get_errno(m);
1818 if (r < 0)
1819 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1820
1821 return 1;
1822 }
1823
1824 int link_down(Link *link) {
1825 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1826 int r;
1827
1828 assert(link);
1829 assert(link->manager);
1830 assert(link->manager->rtnl);
1831
1832 log_link_debug(link, "Bringing link down");
1833
1834 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1835 RTM_SETLINK, link->ifindex);
1836 if (r < 0)
1837 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1838
1839 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1840 if (r < 0)
1841 return log_link_error_errno(link, r, "Could not set link flags: %m");
1842
1843 r = sd_netlink_call_async(link->manager->rtnl, req, link_down_handler, link, 0, NULL);
1844 if (r < 0)
1845 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1846
1847 link_ref(link);
1848
1849 return 0;
1850 }
1851
1852 static int link_up_can(Link *link) {
1853 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1854 int r;
1855
1856 assert(link);
1857
1858 log_link_debug(link, "Bringing CAN link up");
1859
1860 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1861 if (r < 0)
1862 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1863
1864 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1865 if (r < 0)
1866 return log_link_error_errno(link, r, "Could not set link flags: %m");
1867
1868 r = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
1869 if (r < 0)
1870 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1871
1872 link_ref(link);
1873
1874 return 0;
1875 }
1876
1877 static int link_handle_bound_to_list(Link *link) {
1878 Link *l;
1879 Iterator i;
1880 int r;
1881 bool required_up = false;
1882 bool link_is_up = false;
1883
1884 assert(link);
1885
1886 if (hashmap_isempty(link->bound_to_links))
1887 return 0;
1888
1889 if (link->flags & IFF_UP)
1890 link_is_up = true;
1891
1892 HASHMAP_FOREACH (l, link->bound_to_links, i)
1893 if (link_has_carrier(l)) {
1894 required_up = true;
1895 break;
1896 }
1897
1898 if (!required_up && link_is_up) {
1899 r = link_down(link);
1900 if (r < 0)
1901 return r;
1902 } else if (required_up && !link_is_up) {
1903 r = link_up(link);
1904 if (r < 0)
1905 return r;
1906 }
1907
1908 return 0;
1909 }
1910
1911 static int link_handle_bound_by_list(Link *link) {
1912 Iterator i;
1913 Link *l;
1914 int r;
1915
1916 assert(link);
1917
1918 if (hashmap_isempty(link->bound_by_links))
1919 return 0;
1920
1921 HASHMAP_FOREACH (l, link->bound_by_links, i) {
1922 r = link_handle_bound_to_list(l);
1923 if (r < 0)
1924 return r;
1925 }
1926
1927 return 0;
1928 }
1929
1930 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1931 int r;
1932
1933 assert(link);
1934 assert(carrier);
1935
1936 if (link == carrier)
1937 return 0;
1938
1939 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1940 return 0;
1941
1942 r = hashmap_ensure_allocated(h, NULL);
1943 if (r < 0)
1944 return r;
1945
1946 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1947 if (r < 0)
1948 return r;
1949
1950 return 0;
1951 }
1952
1953 static int link_new_bound_by_list(Link *link) {
1954 Manager *m;
1955 Link *carrier;
1956 Iterator i;
1957 int r;
1958 bool list_updated = false;
1959
1960 assert(link);
1961 assert(link->manager);
1962
1963 m = link->manager;
1964
1965 HASHMAP_FOREACH(carrier, m->links, i) {
1966 if (!carrier->network)
1967 continue;
1968
1969 if (strv_isempty(carrier->network->bind_carrier))
1970 continue;
1971
1972 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
1973 r = link_put_carrier(link, carrier, &link->bound_by_links);
1974 if (r < 0)
1975 return r;
1976
1977 list_updated = true;
1978 }
1979 }
1980
1981 if (list_updated)
1982 link_dirty(link);
1983
1984 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
1985 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1986 if (r < 0)
1987 return r;
1988
1989 link_dirty(carrier);
1990 }
1991
1992 return 0;
1993 }
1994
1995 static int link_new_bound_to_list(Link *link) {
1996 Manager *m;
1997 Link *carrier;
1998 Iterator i;
1999 int r;
2000 bool list_updated = false;
2001
2002 assert(link);
2003 assert(link->manager);
2004
2005 if (!link->network)
2006 return 0;
2007
2008 if (strv_isempty(link->network->bind_carrier))
2009 return 0;
2010
2011 m = link->manager;
2012
2013 HASHMAP_FOREACH (carrier, m->links, i) {
2014 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2015 r = link_put_carrier(link, carrier, &link->bound_to_links);
2016 if (r < 0)
2017 return r;
2018
2019 list_updated = true;
2020 }
2021 }
2022
2023 if (list_updated)
2024 link_dirty(link);
2025
2026 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2027 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2028 if (r < 0)
2029 return r;
2030
2031 link_dirty(carrier);
2032 }
2033
2034 return 0;
2035 }
2036
2037 static int link_new_carrier_maps(Link *link) {
2038 int r;
2039
2040 r = link_new_bound_by_list(link);
2041 if (r < 0)
2042 return r;
2043
2044 r = link_handle_bound_by_list(link);
2045 if (r < 0)
2046 return r;
2047
2048 r = link_new_bound_to_list(link);
2049 if (r < 0)
2050 return r;
2051
2052 r = link_handle_bound_to_list(link);
2053 if (r < 0)
2054 return r;
2055
2056 return 0;
2057 }
2058
2059 static void link_free_bound_to_list(Link *link) {
2060 Link *bound_to;
2061 Iterator i;
2062
2063 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2064 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2065
2066 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2067 link_dirty(bound_to);
2068 }
2069
2070 return;
2071 }
2072
2073 static void link_free_bound_by_list(Link *link) {
2074 Link *bound_by;
2075 Iterator i;
2076
2077 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2078 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2079
2080 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2081 link_dirty(bound_by);
2082 link_handle_bound_to_list(bound_by);
2083 }
2084 }
2085
2086 return;
2087 }
2088
2089 static void link_free_carrier_maps(Link *link) {
2090 bool list_updated = false;
2091
2092 assert(link);
2093
2094 if (!hashmap_isempty(link->bound_to_links)) {
2095 link_free_bound_to_list(link);
2096 list_updated = true;
2097 }
2098
2099 if (!hashmap_isempty(link->bound_by_links)) {
2100 link_free_bound_by_list(link);
2101 list_updated = true;
2102 }
2103
2104 if (list_updated)
2105 link_dirty(link);
2106
2107 return;
2108 }
2109
2110 void link_drop(Link *link) {
2111 if (!link || link->state == LINK_STATE_LINGER)
2112 return;
2113
2114 link_set_state(link, LINK_STATE_LINGER);
2115
2116 link_free_carrier_maps(link);
2117
2118 log_link_debug(link, "Link removed");
2119
2120 (void)unlink(link->state_file);
2121 link_unref(link);
2122
2123 return;
2124 }
2125
2126 static int link_joined(Link *link) {
2127 int r;
2128
2129 assert(link);
2130 assert(link->network);
2131
2132 if (!hashmap_isempty(link->bound_to_links)) {
2133 r = link_handle_bound_to_list(link);
2134 if (r < 0)
2135 return r;
2136 } else if (!(link->flags & IFF_UP)) {
2137 r = link_up(link);
2138 if (r < 0) {
2139 link_enter_failed(link);
2140 return r;
2141 }
2142 }
2143
2144 if (link->network->bridge) {
2145 r = link_set_bridge(link);
2146 if (r < 0)
2147 log_link_error_errno(link, r, "Could not set bridge message: %m");
2148 }
2149
2150 if (link->network->bond) {
2151 r = link_bond_set(link);
2152 if (r < 0)
2153 log_link_error_errno(link, r, "Could not set bond message: %m");
2154 }
2155
2156 if (link->network->use_br_vlan &&
2157 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2158 r = link_set_bridge_vlan(link);
2159 if (r < 0)
2160 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2161 }
2162
2163 /* Skip setting up addresses until it gets carrier,
2164 or it would try to set addresses twice,
2165 which is bad for non-idempotent steps. */
2166 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2167 return 0;
2168
2169 return link_enter_set_addresses(link);
2170 }
2171
2172 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
2173 _cleanup_link_unref_ Link *link = userdata;
2174 int r;
2175
2176 assert(link);
2177 assert(link->network);
2178
2179 link->enslaving--;
2180
2181 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2182 return 1;
2183
2184 r = sd_netlink_message_get_errno(m);
2185 if (r < 0 && r != -EEXIST) {
2186 log_link_error_errno(link, r, "Could not join netdev: %m");
2187 link_enter_failed(link);
2188 return 1;
2189 } else
2190 log_link_debug(link, "Joined netdev");
2191
2192 if (link->enslaving <= 0)
2193 link_joined(link);
2194
2195 return 1;
2196 }
2197
2198 static int link_enter_join_netdev(Link *link) {
2199 NetDev *netdev;
2200 Iterator i;
2201 int r;
2202
2203 assert(link);
2204 assert(link->network);
2205 assert(link->state == LINK_STATE_PENDING);
2206
2207 link_set_state(link, LINK_STATE_ENSLAVING);
2208
2209 link_dirty(link);
2210
2211 if (!link->network->bridge &&
2212 !link->network->bond &&
2213 !link->network->vrf &&
2214 hashmap_isempty(link->network->stacked_netdevs))
2215 return link_joined(link);
2216
2217 if (link->network->bond) {
2218 log_struct(LOG_DEBUG,
2219 LOG_LINK_INTERFACE(link),
2220 LOG_NETDEV_INTERFACE(link->network->bond),
2221 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname),
2222 NULL);
2223
2224 r = netdev_join(link->network->bond, link, netdev_join_handler);
2225 if (r < 0) {
2226 log_struct_errno(LOG_WARNING, r,
2227 LOG_LINK_INTERFACE(link),
2228 LOG_NETDEV_INTERFACE(link->network->bond),
2229 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname),
2230 NULL);
2231
2232 link_enter_failed(link);
2233 return r;
2234 }
2235
2236 link->enslaving++;
2237 }
2238
2239 if (link->network->bridge) {
2240 log_struct(LOG_DEBUG,
2241 LOG_LINK_INTERFACE(link),
2242 LOG_NETDEV_INTERFACE(link->network->bridge),
2243 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname),
2244 NULL);
2245
2246 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2247 if (r < 0) {
2248 log_struct_errno(LOG_WARNING, r,
2249 LOG_LINK_INTERFACE(link),
2250 LOG_NETDEV_INTERFACE(link->network->bridge),
2251 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname),
2252 NULL),
2253 link_enter_failed(link);
2254 return r;
2255 }
2256
2257 link->enslaving++;
2258 }
2259
2260 if (link->network->vrf) {
2261 log_struct(LOG_DEBUG,
2262 LOG_LINK_INTERFACE(link),
2263 LOG_NETDEV_INTERFACE(link->network->vrf),
2264 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname),
2265 NULL);
2266 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2267 if (r < 0) {
2268 log_struct_errno(LOG_WARNING, r,
2269 LOG_LINK_INTERFACE(link),
2270 LOG_NETDEV_INTERFACE(link->network->vrf),
2271 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname),
2272 NULL);
2273 link_enter_failed(link);
2274 return r;
2275 }
2276
2277 link->enslaving++;
2278 }
2279
2280 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2281
2282 log_struct(LOG_DEBUG,
2283 LOG_LINK_INTERFACE(link),
2284 LOG_NETDEV_INTERFACE(netdev),
2285 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname),
2286 NULL);
2287
2288 r = netdev_join(netdev, link, netdev_join_handler);
2289 if (r < 0) {
2290 log_struct_errno(LOG_WARNING, r,
2291 LOG_LINK_INTERFACE(link),
2292 LOG_NETDEV_INTERFACE(netdev),
2293 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname),
2294 NULL);
2295 link_enter_failed(link);
2296 return r;
2297 }
2298
2299 link->enslaving++;
2300 }
2301
2302 return 0;
2303 }
2304
2305 static int link_set_ipv4_forward(Link *link) {
2306 int r;
2307
2308 if (!link_ipv4_forward_enabled(link))
2309 return 0;
2310
2311 /* We propagate the forwarding flag from one interface to the
2312 * global setting one way. This means: as long as at least one
2313 * interface was configured at any time that had IP forwarding
2314 * enabled the setting will stay on for good. We do this
2315 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2316 * somewhat in sync (see below). */
2317
2318 r = write_string_file("/proc/sys/net/ipv4/ip_forward", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2319 if (r < 0)
2320 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2321
2322 return 0;
2323 }
2324
2325 static int link_set_ipv6_forward(Link *link) {
2326 int r;
2327
2328 if (!link_ipv6_forward_enabled(link))
2329 return 0;
2330
2331 /* On Linux, the IPv6 stack does not know a per-interface
2332 * packet forwarding setting: either packet forwarding is on
2333 * for all, or off for all. We hence don't bother with a
2334 * per-interface setting, but simply propagate the interface
2335 * flag, if it is set, to the global flag, one-way. Note that
2336 * while IPv4 would allow a per-interface flag, we expose the
2337 * same behaviour there and also propagate the setting from
2338 * one to all, to keep things simple (see above). */
2339
2340 r = write_string_file("/proc/sys/net/ipv6/conf/all/forwarding", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2341 if (r < 0)
2342 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2343
2344 return 0;
2345 }
2346
2347 static int link_set_ipv6_privacy_extensions(Link *link) {
2348 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2349 IPv6PrivacyExtensions s;
2350 const char *p = NULL;
2351 int r;
2352
2353 s = link_ipv6_privacy_extensions(link);
2354 if (s < 0)
2355 return 0;
2356
2357 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/use_tempaddr");
2358 xsprintf(buf, "%u", (unsigned) link->network->ipv6_privacy_extensions);
2359
2360 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2361 if (r < 0)
2362 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2363
2364 return 0;
2365 }
2366
2367 static int link_set_ipv6_accept_ra(Link *link) {
2368 const char *p = NULL;
2369 int r;
2370
2371 /* Make this a NOP if IPv6 is not available */
2372 if (!socket_ipv6_is_supported())
2373 return 0;
2374
2375 if (link->flags & IFF_LOOPBACK)
2376 return 0;
2377
2378 if (!link->network)
2379 return 0;
2380
2381 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/accept_ra");
2382
2383 /* We handle router advertisements ourselves, tell the kernel to GTFO */
2384 r = write_string_file(p, "0", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2385 if (r < 0)
2386 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2387
2388 return 0;
2389 }
2390
2391 static int link_set_ipv6_dad_transmits(Link *link) {
2392 char buf[DECIMAL_STR_MAX(int) + 1];
2393 const char *p = NULL;
2394 int r;
2395
2396 /* Make this a NOP if IPv6 is not available */
2397 if (!socket_ipv6_is_supported())
2398 return 0;
2399
2400 if (link->flags & IFF_LOOPBACK)
2401 return 0;
2402
2403 if (!link->network)
2404 return 0;
2405
2406 if (link->network->ipv6_dad_transmits < 0)
2407 return 0;
2408
2409 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/dad_transmits");
2410 xsprintf(buf, "%i", link->network->ipv6_dad_transmits);
2411
2412 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2413 if (r < 0)
2414 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2415
2416 return 0;
2417 }
2418
2419 static int link_set_ipv6_hop_limit(Link *link) {
2420 char buf[DECIMAL_STR_MAX(int) + 1];
2421 const char *p = NULL;
2422 int r;
2423
2424 /* Make this a NOP if IPv6 is not available */
2425 if (!socket_ipv6_is_supported())
2426 return 0;
2427
2428 if (link->flags & IFF_LOOPBACK)
2429 return 0;
2430
2431 if (!link->network)
2432 return 0;
2433
2434 if (link->network->ipv6_hop_limit < 0)
2435 return 0;
2436
2437 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/hop_limit");
2438 xsprintf(buf, "%i", link->network->ipv6_hop_limit);
2439
2440 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2441 if (r < 0)
2442 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2443
2444 return 0;
2445 }
2446
2447 static int link_drop_foreign_config(Link *link) {
2448 Address *address;
2449 Route *route;
2450 Iterator i;
2451 int r;
2452
2453 SET_FOREACH(address, link->addresses_foreign, i) {
2454 /* we consider IPv6LL addresses to be managed by the kernel */
2455 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2456 continue;
2457
2458 r = address_remove(address, link, link_address_remove_handler);
2459 if (r < 0)
2460 return r;
2461 }
2462
2463 SET_FOREACH(route, link->routes_foreign, i) {
2464 /* do not touch routes managed by the kernel */
2465 if (route->protocol == RTPROT_KERNEL)
2466 continue;
2467
2468 r = route_remove(route, link, link_route_remove_handler);
2469 if (r < 0)
2470 return r;
2471 }
2472
2473 return 0;
2474 }
2475
2476 static int link_drop_config(Link *link) {
2477 Address *address, *pool_address;
2478 Route *route;
2479 Iterator i;
2480 int r;
2481
2482 SET_FOREACH(address, link->addresses, i) {
2483 /* we consider IPv6LL addresses to be managed by the kernel */
2484 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2485 continue;
2486
2487 r = address_remove(address, link, link_address_remove_handler);
2488 if (r < 0)
2489 return r;
2490
2491 /* If this address came from an address pool, clean up the pool */
2492 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2493 if (address_equal(address, pool_address)) {
2494 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2495 address_free(pool_address);
2496 break;
2497 }
2498 }
2499 }
2500
2501 SET_FOREACH(route, link->routes, i) {
2502 /* do not touch routes managed by the kernel */
2503 if (route->protocol == RTPROT_KERNEL)
2504 continue;
2505
2506 r = route_remove(route, link, link_route_remove_handler);
2507 if (r < 0)
2508 return r;
2509 }
2510
2511 ndisc_flush(link);
2512
2513 return 0;
2514 }
2515
2516 static int link_update_lldp(Link *link) {
2517 int r;
2518
2519 assert(link);
2520
2521 if (!link->lldp)
2522 return 0;
2523
2524 if (link->flags & IFF_UP) {
2525 r = sd_lldp_start(link->lldp);
2526 if (r > 0)
2527 log_link_debug(link, "Started LLDP.");
2528 } else {
2529 r = sd_lldp_stop(link->lldp);
2530 if (r > 0)
2531 log_link_debug(link, "Stopped LLDP.");
2532 }
2533
2534 return r;
2535 }
2536
2537 static int link_configure(Link *link) {
2538 int r;
2539
2540 assert(link);
2541 assert(link->network);
2542 assert(link->state == LINK_STATE_PENDING);
2543
2544 if (streq_ptr(link->kind, "vcan")) {
2545
2546 if (!(link->flags & IFF_UP)) {
2547 r = link_up_can(link);
2548 if (r < 0) {
2549 link_enter_failed(link);
2550 return r;
2551 }
2552 }
2553
2554 return 0;
2555 }
2556
2557 /* Drop foreign config, but ignore loopback or critical devices.
2558 * We do not want to remove loopback address or addresses used for root NFS. */
2559 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2560 r = link_drop_foreign_config(link);
2561 if (r < 0)
2562 return r;
2563 }
2564
2565 r = link_set_proxy_arp(link);
2566 if (r < 0)
2567 return r;
2568
2569 r = ipv6_proxy_ndp_addresses_configure(link);
2570 if (r < 0)
2571 return r;
2572
2573 r = link_set_ipv4_forward(link);
2574 if (r < 0)
2575 return r;
2576
2577 r = link_set_ipv6_forward(link);
2578 if (r < 0)
2579 return r;
2580
2581 r = link_set_ipv6_privacy_extensions(link);
2582 if (r < 0)
2583 return r;
2584
2585 r = link_set_ipv6_accept_ra(link);
2586 if (r < 0)
2587 return r;
2588
2589 r = link_set_ipv6_dad_transmits(link);
2590 if (r < 0)
2591 return r;
2592
2593 r = link_set_ipv6_hop_limit(link);
2594 if (r < 0)
2595 return r;
2596
2597 r = link_set_flags(link);
2598 if (r < 0)
2599 return r;
2600
2601 if (link_ipv4ll_enabled(link)) {
2602 r = ipv4ll_configure(link);
2603 if (r < 0)
2604 return r;
2605 }
2606
2607 if (link_dhcp4_enabled(link)) {
2608 r = dhcp4_configure(link);
2609 if (r < 0)
2610 return r;
2611 }
2612
2613 if (link_dhcp4_server_enabled(link)) {
2614 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2615 if (r < 0)
2616 return r;
2617
2618 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2619 if (r < 0)
2620 return r;
2621 }
2622
2623 if (link_dhcp6_enabled(link) ||
2624 link_ipv6_accept_ra_enabled(link)) {
2625 r = dhcp6_configure(link);
2626 if (r < 0)
2627 return r;
2628 }
2629
2630 if (link_ipv6_accept_ra_enabled(link)) {
2631 r = ndisc_configure(link);
2632 if (r < 0)
2633 return r;
2634 }
2635
2636 if (link_radv_enabled(link)) {
2637 r = radv_configure(link);
2638 if (r < 0)
2639 return r;
2640 }
2641
2642 if (link_lldp_rx_enabled(link)) {
2643 r = sd_lldp_new(&link->lldp);
2644 if (r < 0)
2645 return r;
2646
2647 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
2648 if (r < 0)
2649 return r;
2650
2651 r = sd_lldp_match_capabilities(link->lldp,
2652 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
2653 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
2654 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
2655 if (r < 0)
2656 return r;
2657
2658 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
2659 if (r < 0)
2660 return r;
2661
2662 r = sd_lldp_attach_event(link->lldp, NULL, 0);
2663 if (r < 0)
2664 return r;
2665
2666 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
2667 if (r < 0)
2668 return r;
2669
2670 r = link_update_lldp(link);
2671 if (r < 0)
2672 return r;
2673 }
2674
2675 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2676 r = link_acquire_conf(link);
2677 if (r < 0)
2678 return r;
2679 }
2680
2681 return link_enter_join_netdev(link);
2682 }
2683
2684 static int link_initialized_and_synced(sd_netlink *rtnl, sd_netlink_message *m,
2685 void *userdata) {
2686 _cleanup_link_unref_ Link *link = userdata;
2687 Network *network;
2688 int r;
2689
2690 assert(link);
2691 assert(link->ifname);
2692 assert(link->manager);
2693
2694 if (link->state != LINK_STATE_PENDING)
2695 return 1;
2696
2697 log_link_debug(link, "Link state is up-to-date");
2698
2699 r = link_new_bound_by_list(link);
2700 if (r < 0)
2701 return r;
2702
2703 r = link_handle_bound_by_list(link);
2704 if (r < 0)
2705 return r;
2706
2707 if (!link->network) {
2708 r = network_get(link->manager, link->udev_device, link->ifname,
2709 &link->mac, &network);
2710 if (r == -ENOENT) {
2711 link_enter_unmanaged(link);
2712 return 1;
2713 } else if (r == 0 && network->unmanaged) {
2714 link_enter_unmanaged(link);
2715 return 0;
2716 } else if (r < 0)
2717 return r;
2718
2719 if (link->flags & IFF_LOOPBACK) {
2720 if (network->link_local != ADDRESS_FAMILY_NO)
2721 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2722
2723 if (network->dhcp != ADDRESS_FAMILY_NO)
2724 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2725
2726 if (network->dhcp_server)
2727 log_link_debug(link, "Ignoring DHCP server for loopback link");
2728 }
2729
2730 r = network_apply(network, link);
2731 if (r < 0)
2732 return r;
2733 }
2734
2735 r = link_new_bound_to_list(link);
2736 if (r < 0)
2737 return r;
2738
2739 r = link_configure(link);
2740 if (r < 0)
2741 return r;
2742
2743 return 1;
2744 }
2745
2746 int link_initialized(Link *link, struct udev_device *device) {
2747 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2748 int r;
2749
2750 assert(link);
2751 assert(link->manager);
2752 assert(link->manager->rtnl);
2753 assert(device);
2754
2755 if (link->state != LINK_STATE_PENDING)
2756 return 0;
2757
2758 if (link->udev_device)
2759 return 0;
2760
2761 log_link_debug(link, "udev initialized link");
2762
2763 link->udev_device = udev_device_ref(device);
2764
2765 /* udev has initialized the link, but we don't know if we have yet
2766 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2767 * when it returns we know that the pending NEWLINKs have already been
2768 * processed and that we are up-to-date */
2769
2770 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2771 link->ifindex);
2772 if (r < 0)
2773 return r;
2774
2775 r = sd_netlink_call_async(link->manager->rtnl, req,
2776 link_initialized_and_synced, link, 0, NULL);
2777 if (r < 0)
2778 return r;
2779
2780 link_ref(link);
2781
2782 return 0;
2783 }
2784
2785 static int link_load(Link *link) {
2786 _cleanup_free_ char *network_file = NULL,
2787 *addresses = NULL,
2788 *routes = NULL,
2789 *dhcp4_address = NULL,
2790 *ipv4ll_address = NULL;
2791 union in_addr_union address;
2792 union in_addr_union route_dst;
2793 const char *p;
2794 int r;
2795
2796 assert(link);
2797
2798 r = parse_env_file(link->state_file, NEWLINE,
2799 "NETWORK_FILE", &network_file,
2800 "ADDRESSES", &addresses,
2801 "ROUTES", &routes,
2802 "DHCP4_ADDRESS", &dhcp4_address,
2803 "IPV4LL_ADDRESS", &ipv4ll_address,
2804 NULL);
2805 if (r < 0 && r != -ENOENT)
2806 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
2807
2808 if (network_file) {
2809 Network *network;
2810 char *suffix;
2811
2812 /* drop suffix */
2813 suffix = strrchr(network_file, '.');
2814 if (!suffix) {
2815 log_link_debug(link, "Failed to get network name from %s", network_file);
2816 goto network_file_fail;
2817 }
2818 *suffix = '\0';
2819
2820 r = network_get_by_name(link->manager, basename(network_file), &network);
2821 if (r < 0) {
2822 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
2823 goto network_file_fail;
2824 }
2825
2826 r = network_apply(network, link);
2827 if (r < 0)
2828 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
2829 }
2830
2831 network_file_fail:
2832
2833 if (addresses) {
2834 p = addresses;
2835
2836 for (;;) {
2837 _cleanup_free_ char *address_str = NULL;
2838 char *prefixlen_str;
2839 int family;
2840 unsigned char prefixlen;
2841
2842 r = extract_first_word(&p, &address_str, NULL, 0);
2843 if (r < 0) {
2844 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
2845 continue;
2846 }
2847 if (r == 0)
2848 break;
2849
2850 prefixlen_str = strchr(address_str, '/');
2851 if (!prefixlen_str) {
2852 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
2853 continue;
2854 }
2855
2856 *prefixlen_str++ = '\0';
2857
2858 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
2859 if (r != 1) {
2860 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
2861 continue;
2862 }
2863
2864 r = in_addr_from_string_auto(address_str, &family, &address);
2865 if (r < 0) {
2866 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
2867 continue;
2868 }
2869
2870 r = address_add(link, family, &address, prefixlen, NULL);
2871 if (r < 0)
2872 return log_link_error_errno(link, r, "Failed to add address: %m");
2873 }
2874 }
2875
2876 if (routes) {
2877 p = routes;
2878
2879 for (;;) {
2880 Route *route;
2881 _cleanup_free_ char *route_str = NULL;
2882 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
2883 usec_t lifetime;
2884 char *prefixlen_str;
2885 int family;
2886 unsigned char prefixlen, tos, table;
2887 uint32_t priority;
2888
2889 r = extract_first_word(&p, &route_str, NULL, 0);
2890 if (r < 0) {
2891 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
2892 continue;
2893 }
2894 if (r == 0)
2895 break;
2896
2897 prefixlen_str = strchr(route_str, '/');
2898 if (!prefixlen_str) {
2899 log_link_debug(link, "Failed to parse route %s", route_str);
2900 continue;
2901 }
2902
2903 *prefixlen_str++ = '\0';
2904
2905 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
2906 if (r != 5) {
2907 log_link_debug(link,
2908 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
2909 prefixlen_str);
2910 continue;
2911 }
2912
2913 r = in_addr_from_string_auto(route_str, &family, &route_dst);
2914 if (r < 0) {
2915 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
2916 continue;
2917 }
2918
2919 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
2920 if (r < 0)
2921 return log_link_error_errno(link, r, "Failed to add route: %m");
2922
2923 if (lifetime != USEC_INFINITY) {
2924 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
2925 0, route_expire_handler, route);
2926 if (r < 0)
2927 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
2928 }
2929
2930 route->lifetime = lifetime;
2931 sd_event_source_unref(route->expire);
2932 route->expire = expire;
2933 expire = NULL;
2934 }
2935 }
2936
2937 if (dhcp4_address) {
2938 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
2939 if (r < 0) {
2940 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
2941 goto dhcp4_address_fail;
2942 }
2943
2944 r = sd_dhcp_client_new(&link->dhcp_client, link->network->dhcp_anonymize);
2945 if (r < 0)
2946 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
2947
2948 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
2949 if (r < 0)
2950 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
2951 }
2952
2953 dhcp4_address_fail:
2954
2955 if (ipv4ll_address) {
2956 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
2957 if (r < 0) {
2958 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
2959 goto ipv4ll_address_fail;
2960 }
2961
2962 r = sd_ipv4ll_new(&link->ipv4ll);
2963 if (r < 0)
2964 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
2965
2966 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
2967 if (r < 0)
2968 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
2969 }
2970
2971 ipv4ll_address_fail:
2972
2973 return 0;
2974 }
2975
2976 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
2977 Link *link;
2978 _cleanup_udev_device_unref_ struct udev_device *device = NULL;
2979 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
2980 int r;
2981
2982 assert(m);
2983 assert(m->rtnl);
2984 assert(message);
2985 assert(ret);
2986
2987 r = link_new(m, message, ret);
2988 if (r < 0)
2989 return r;
2990
2991 link = *ret;
2992
2993 log_link_debug(link, "Link %d added", link->ifindex);
2994
2995 r = link_load(link);
2996 if (r < 0)
2997 return r;
2998
2999 if (detect_container() <= 0) {
3000 /* not in a container, udev will be around */
3001 sprintf(ifindex_str, "n%d", link->ifindex);
3002 device = udev_device_new_from_device_id(m->udev, ifindex_str);
3003 if (!device) {
3004 r = log_link_warning_errno(link, errno, "Could not find udev device: %m");
3005 goto failed;
3006 }
3007
3008 if (udev_device_get_is_initialized(device) <= 0) {
3009 /* not yet ready */
3010 log_link_debug(link, "link pending udev initialization...");
3011 return 0;
3012 }
3013
3014 r = link_initialized(link, device);
3015 if (r < 0)
3016 goto failed;
3017 } else {
3018 /* we are calling a callback directly, so must take a ref */
3019 link_ref(link);
3020
3021 r = link_initialized_and_synced(m->rtnl, NULL, link);
3022 if (r < 0)
3023 goto failed;
3024 }
3025
3026 return 0;
3027 failed:
3028 link_enter_failed(link);
3029 return r;
3030 }
3031
3032 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3033 int r;
3034
3035 assert(link);
3036
3037 log_link_info(link, "Gained IPv6LL");
3038
3039 link->ipv6ll_address = *address;
3040 link_check_ready(link);
3041
3042 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3043 r = link_acquire_ipv6_conf(link);
3044 if (r < 0) {
3045 link_enter_failed(link);
3046 return r;
3047 }
3048 }
3049
3050 return 0;
3051 }
3052
3053 static int link_carrier_gained(Link *link) {
3054 int r;
3055
3056 assert(link);
3057
3058 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3059 r = link_acquire_conf(link);
3060 if (r < 0) {
3061 link_enter_failed(link);
3062 return r;
3063 }
3064
3065 r = link_enter_set_addresses(link);
3066 if (r < 0)
3067 return r;
3068 }
3069
3070 r = link_handle_bound_by_list(link);
3071 if (r < 0)
3072 return r;
3073
3074 return 0;
3075 }
3076
3077 static int link_carrier_lost(Link *link) {
3078 int r;
3079
3080 assert(link);
3081
3082 r = link_stop_clients(link);
3083 if (r < 0) {
3084 link_enter_failed(link);
3085 return r;
3086 }
3087
3088 if (link_dhcp4_server_enabled(link))
3089 (void) sd_dhcp_server_stop(link->dhcp_server);
3090
3091 r = link_drop_config(link);
3092 if (r < 0)
3093 return r;
3094
3095 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3096 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3097 r = link_drop_foreign_config(link);
3098 if (r < 0)
3099 return r;
3100 }
3101
3102 r = link_handle_bound_by_list(link);
3103 if (r < 0)
3104 return r;
3105
3106 return 0;
3107 }
3108
3109 int link_carrier_reset(Link *link) {
3110 int r;
3111
3112 assert(link);
3113
3114 if (link_has_carrier(link)) {
3115 r = link_carrier_lost(link);
3116 if (r < 0)
3117 return r;
3118
3119 r = link_carrier_gained(link);
3120 if (r < 0)
3121 return r;
3122
3123 log_link_info(link, "Reset carrier");
3124 }
3125
3126 return 0;
3127 }
3128
3129 int link_update(Link *link, sd_netlink_message *m) {
3130 struct ether_addr mac;
3131 const char *ifname;
3132 uint32_t mtu;
3133 bool had_carrier, carrier_gained, carrier_lost;
3134 int r;
3135
3136 assert(link);
3137 assert(link->ifname);
3138 assert(m);
3139
3140 if (link->state == LINK_STATE_LINGER) {
3141 link_ref(link);
3142 log_link_info(link, "Link readded");
3143 link_set_state(link, LINK_STATE_ENSLAVING);
3144
3145 r = link_new_carrier_maps(link);
3146 if (r < 0)
3147 return r;
3148 }
3149
3150 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3151 if (r >= 0 && !streq(ifname, link->ifname)) {
3152 log_link_info(link, "Renamed to %s", ifname);
3153
3154 link_free_carrier_maps(link);
3155
3156 r = free_and_strdup(&link->ifname, ifname);
3157 if (r < 0)
3158 return r;
3159
3160 r = link_new_carrier_maps(link);
3161 if (r < 0)
3162 return r;
3163 }
3164
3165 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3166 if (r >= 0 && mtu > 0) {
3167 link->mtu = mtu;
3168 if (!link->original_mtu) {
3169 link->original_mtu = mtu;
3170 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3171 }
3172
3173 if (link->dhcp_client) {
3174 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3175 link->mtu);
3176 if (r < 0) {
3177 log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3178 return r;
3179 }
3180 }
3181
3182 if (link->radv) {
3183 r = sd_radv_set_mtu(link->radv, link->mtu);
3184 if (r < 0)
3185 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3186 }
3187 }
3188
3189 /* The kernel may broadcast NEWLINK messages without the MAC address
3190 set, simply ignore them. */
3191 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3192 if (r >= 0) {
3193 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3194 ETH_ALEN)) {
3195
3196 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3197 ETH_ALEN);
3198
3199 log_link_debug(link, "MAC address: "
3200 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3201 mac.ether_addr_octet[0],
3202 mac.ether_addr_octet[1],
3203 mac.ether_addr_octet[2],
3204 mac.ether_addr_octet[3],
3205 mac.ether_addr_octet[4],
3206 mac.ether_addr_octet[5]);
3207
3208 if (link->ipv4ll) {
3209 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3210 if (r < 0)
3211 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3212 }
3213
3214 if (link->dhcp_client) {
3215 r = sd_dhcp_client_set_mac(link->dhcp_client,
3216 (const uint8_t *) &link->mac,
3217 sizeof (link->mac),
3218 ARPHRD_ETHER);
3219 if (r < 0)
3220 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3221
3222 switch (link->network->dhcp_client_identifier) {
3223 case DHCP_CLIENT_ID_DUID: {
3224 const DUID *duid = link_duid(link);
3225
3226 r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
3227 link->network->iaid,
3228 duid->type,
3229 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3230 duid->raw_data_len);
3231 if (r < 0)
3232 return log_link_warning_errno(link, r, "Could not update DUID/IAID in DHCP client: %m");
3233 break;
3234 }
3235 case DHCP_CLIENT_ID_MAC:
3236 r = sd_dhcp_client_set_client_id(link->dhcp_client,
3237 ARPHRD_ETHER,
3238 (const uint8_t *)&link->mac,
3239 sizeof(link->mac));
3240 if(r < 0)
3241 return log_link_warning_errno(link, r, "Could not update MAC client id in DHCP client: %m");
3242 break;
3243 default:
3244 assert_not_reached("Unknown client identifier type.");
3245 }
3246 }
3247
3248 if (link->dhcp6_client) {
3249 const DUID* duid = link_duid(link);
3250
3251 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3252 (const uint8_t *) &link->mac,
3253 sizeof (link->mac),
3254 ARPHRD_ETHER);
3255 if (r < 0)
3256 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3257
3258 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3259 link->network->iaid);
3260 if (r < 0)
3261 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3262
3263 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3264 duid->type,
3265 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3266 duid->raw_data_len);
3267 if (r < 0)
3268 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3269 }
3270
3271 if (link->radv) {
3272 r = sd_radv_set_mac(link->radv, &link->mac);
3273 if (r < 0)
3274 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3275 }
3276 }
3277 }
3278
3279 had_carrier = link_has_carrier(link);
3280
3281 r = link_update_flags(link, m);
3282 if (r < 0)
3283 return r;
3284
3285 r = link_update_lldp(link);
3286 if (r < 0)
3287 return r;
3288
3289 carrier_gained = !had_carrier && link_has_carrier(link);
3290 carrier_lost = had_carrier && !link_has_carrier(link);
3291
3292 if (carrier_gained) {
3293 log_link_info(link, "Gained carrier");
3294
3295 r = link_carrier_gained(link);
3296 if (r < 0)
3297 return r;
3298 } else if (carrier_lost) {
3299 log_link_info(link, "Lost carrier");
3300
3301 r = link_carrier_lost(link);
3302 if (r < 0)
3303 return r;
3304 }
3305
3306 return 0;
3307 }
3308
3309 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3310 bool space = false;
3311 Iterator i;
3312 Link *link;
3313
3314 assert(f);
3315 assert(prefix);
3316
3317 if (hashmap_isempty(h))
3318 return;
3319
3320 fputs_unlocked(prefix, f);
3321 HASHMAP_FOREACH(link, h, i) {
3322 if (space)
3323 fputc_unlocked(' ', f);
3324
3325 fprintf(f, "%i", link->ifindex);
3326 space = true;
3327 }
3328
3329 fputc_unlocked('\n', f);
3330 }
3331
3332 int link_save(Link *link) {
3333 _cleanup_free_ char *temp_path = NULL;
3334 _cleanup_fclose_ FILE *f = NULL;
3335 const char *admin_state, *oper_state;
3336 Address *a;
3337 Route *route;
3338 Iterator i;
3339 int r;
3340
3341 assert(link);
3342 assert(link->state_file);
3343 assert(link->lease_file);
3344 assert(link->manager);
3345
3346 if (link->state == LINK_STATE_LINGER) {
3347 unlink(link->state_file);
3348 return 0;
3349 }
3350
3351 link_lldp_save(link);
3352
3353 admin_state = link_state_to_string(link->state);
3354 assert(admin_state);
3355
3356 oper_state = link_operstate_to_string(link->operstate);
3357 assert(oper_state);
3358
3359 r = fopen_temporary(link->state_file, &f, &temp_path);
3360 if (r < 0)
3361 goto fail;
3362
3363 (void) fchmod(fileno(f), 0644);
3364
3365 fprintf(f,
3366 "# This is private data. Do not parse.\n"
3367 "ADMIN_STATE=%s\n"
3368 "OPER_STATE=%s\n",
3369 admin_state, oper_state);
3370
3371 if (link->network) {
3372 bool space;
3373 sd_dhcp6_lease *dhcp6_lease = NULL;
3374 const char *dhcp_domainname = NULL;
3375 char **dhcp6_domains = NULL;
3376 char **dhcp_domains = NULL;
3377 unsigned j;
3378
3379 if (link->dhcp6_client) {
3380 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3381 if (r < 0 && r != -ENOMSG)
3382 log_link_debug(link, "No DHCPv6 lease");
3383 }
3384
3385 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3386
3387 fputs_unlocked("DNS=", f);
3388 space = false;
3389
3390 for (j = 0; j < link->network->n_dns; j++) {
3391 _cleanup_free_ char *b = NULL;
3392
3393 r = in_addr_to_string(link->network->dns[j].family,
3394 &link->network->dns[j].address, &b);
3395 if (r < 0) {
3396 log_debug_errno(r, "Failed to format address, ignoring: %m");
3397 continue;
3398 }
3399
3400 if (space)
3401 fputc_unlocked(' ', f);
3402 fputs_unlocked(b, f);
3403 space = true;
3404 }
3405
3406 if (link->network->dhcp_use_dns &&
3407 link->dhcp_lease) {
3408 const struct in_addr *addresses;
3409
3410 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3411 if (r > 0) {
3412 if (space)
3413 fputc_unlocked(' ', f);
3414 serialize_in_addrs(f, addresses, r);
3415 space = true;
3416 }
3417 }
3418
3419 if (link->network->dhcp_use_dns && dhcp6_lease) {
3420 struct in6_addr *in6_addrs;
3421
3422 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3423 if (r > 0) {
3424 if (space)
3425 fputc_unlocked(' ', f);
3426 serialize_in6_addrs(f, in6_addrs, r);
3427 space = true;
3428 }
3429 }
3430
3431 /* Make sure to flush out old entries before we use the NDISC data */
3432 ndisc_vacuum(link);
3433
3434 if (link->network->dhcp_use_dns && link->ndisc_rdnss) {
3435 NDiscRDNSS *dd;
3436
3437 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3438 if (space)
3439 fputc_unlocked(' ', f);
3440
3441 serialize_in6_addrs(f, &dd->address, 1);
3442 space = true;
3443 }
3444 }
3445
3446 fputc_unlocked('\n', f);
3447
3448 fputs_unlocked("NTP=", f);
3449 space = false;
3450 fputstrv(f, link->network->ntp, NULL, &space);
3451
3452 if (link->network->dhcp_use_ntp &&
3453 link->dhcp_lease) {
3454 const struct in_addr *addresses;
3455
3456 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3457 if (r > 0) {
3458 if (space)
3459 fputc_unlocked(' ', f);
3460 serialize_in_addrs(f, addresses, r);
3461 space = true;
3462 }
3463 }
3464
3465 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3466 struct in6_addr *in6_addrs;
3467 char **hosts;
3468
3469 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3470 &in6_addrs);
3471 if (r > 0) {
3472 if (space)
3473 fputc_unlocked(' ', f);
3474 serialize_in6_addrs(f, in6_addrs, r);
3475 space = true;
3476 }
3477
3478 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3479 if (r > 0)
3480 fputstrv(f, hosts, NULL, &space);
3481 }
3482
3483 fputc_unlocked('\n', f);
3484
3485 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3486 if (link->dhcp_lease) {
3487 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3488 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3489 }
3490 if (dhcp6_lease)
3491 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3492 }
3493
3494 fputs_unlocked("DOMAINS=", f);
3495 space = false;
3496 fputstrv(f, link->network->search_domains, NULL, &space);
3497
3498 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3499 NDiscDNSSL *dd;
3500
3501 if (dhcp_domainname)
3502 fputs_with_space(f, dhcp_domainname, NULL, &space);
3503 if (dhcp_domains)
3504 fputstrv(f, dhcp_domains, NULL, &space);
3505 if (dhcp6_domains)
3506 fputstrv(f, dhcp6_domains, NULL, &space);
3507
3508 SET_FOREACH(dd, link->ndisc_dnssl, i)
3509 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3510 }
3511
3512 fputc_unlocked('\n', f);
3513
3514 fputs_unlocked("ROUTE_DOMAINS=", f);
3515 space = false;
3516 fputstrv(f, link->network->route_domains, NULL, &space);
3517
3518 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3519 NDiscDNSSL *dd;
3520
3521 if (dhcp_domainname)
3522 fputs_with_space(f, dhcp_domainname, NULL, &space);
3523 if (dhcp_domains)
3524 fputstrv(f, dhcp_domains, NULL, &space);
3525 if (dhcp6_domains)
3526 fputstrv(f, dhcp6_domains, NULL, &space);
3527
3528 SET_FOREACH(dd, link->ndisc_dnssl, i)
3529 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3530 }
3531
3532 fputc_unlocked('\n', f);
3533
3534 fprintf(f, "LLMNR=%s\n",
3535 resolve_support_to_string(link->network->llmnr));
3536 fprintf(f, "MDNS=%s\n",
3537 resolve_support_to_string(link->network->mdns));
3538
3539 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3540 fprintf(f, "DNSSEC=%s\n",
3541 dnssec_mode_to_string(link->network->dnssec_mode));
3542
3543 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3544 const char *n;
3545
3546 fputs_unlocked("DNSSEC_NTA=", f);
3547 space = false;
3548 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3549 fputs_with_space(f, n, NULL, &space);
3550 fputc_unlocked('\n', f);
3551 }
3552
3553 fputs_unlocked("ADDRESSES=", f);
3554 space = false;
3555 SET_FOREACH(a, link->addresses, i) {
3556 _cleanup_free_ char *address_str = NULL;
3557
3558 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3559 if (r < 0)
3560 goto fail;
3561
3562 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3563 space = true;
3564 }
3565 fputc_unlocked('\n', f);
3566
3567 fputs_unlocked("ROUTES=", f);
3568 space = false;
3569 SET_FOREACH(route, link->routes, i) {
3570 _cleanup_free_ char *route_str = NULL;
3571
3572 r = in_addr_to_string(route->family, &route->dst, &route_str);
3573 if (r < 0)
3574 goto fail;
3575
3576 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%hhu/"USEC_FMT, space ? " " : "", route_str,
3577 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3578 space = true;
3579 }
3580
3581 fputc_unlocked('\n', f);
3582 }
3583
3584 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3585 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3586
3587 if (link->dhcp_lease) {
3588 struct in_addr address;
3589 const char *tz = NULL;
3590
3591 assert(link->network);
3592
3593 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3594 if (r >= 0)
3595 fprintf(f, "TIMEZONE=%s\n", tz);
3596
3597 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3598 if (r >= 0) {
3599 fputs_unlocked("DHCP4_ADDRESS=", f);
3600 serialize_in_addrs(f, &address, 1);
3601 fputc_unlocked('\n', f);
3602 }
3603
3604 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3605 if (r < 0)
3606 goto fail;
3607
3608 fprintf(f,
3609 "DHCP_LEASE=%s\n",
3610 link->lease_file);
3611 } else
3612 unlink(link->lease_file);
3613
3614 if (link->ipv4ll) {
3615 struct in_addr address;
3616
3617 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3618 if (r >= 0) {
3619 fputs_unlocked("IPV4LL_ADDRESS=", f);
3620 serialize_in_addrs(f, &address, 1);
3621 fputc_unlocked('\n', f);
3622 }
3623 }
3624
3625 r = fflush_and_check(f);
3626 if (r < 0)
3627 goto fail;
3628
3629 if (rename(temp_path, link->state_file) < 0) {
3630 r = -errno;
3631 goto fail;
3632 }
3633
3634 return 0;
3635
3636 fail:
3637 (void) unlink(link->state_file);
3638 if (temp_path)
3639 (void) unlink(temp_path);
3640
3641 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3642 }
3643
3644 /* The serialized state in /run is no longer up-to-date. */
3645 void link_dirty(Link *link) {
3646 int r;
3647
3648 assert(link);
3649
3650 /* mark manager dirty as link is dirty */
3651 manager_dirty(link->manager);
3652
3653 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3654 if (r < 0)
3655 /* allocation errors are ignored */
3656 return;
3657
3658 r = set_put(link->manager->dirty_links, link);
3659 if (r <= 0)
3660 /* don't take another ref if the link was already dirty */
3661 return;
3662
3663 link_ref(link);
3664 }
3665
3666 /* The serialized state in /run is up-to-date */
3667 void link_clean(Link *link) {
3668 assert(link);
3669 assert(link->manager);
3670
3671 set_remove(link->manager->dirty_links, link);
3672 link_unref(link);
3673 }
3674
3675 static const char* const link_state_table[_LINK_STATE_MAX] = {
3676 [LINK_STATE_PENDING] = "pending",
3677 [LINK_STATE_ENSLAVING] = "configuring",
3678 [LINK_STATE_SETTING_ADDRESSES] = "configuring",
3679 [LINK_STATE_SETTING_ROUTES] = "configuring",
3680 [LINK_STATE_CONFIGURED] = "configured",
3681 [LINK_STATE_UNMANAGED] = "unmanaged",
3682 [LINK_STATE_FAILED] = "failed",
3683 [LINK_STATE_LINGER] = "linger",
3684 };
3685
3686 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
3687
3688 static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
3689 [LINK_OPERSTATE_OFF] = "off",
3690 [LINK_OPERSTATE_NO_CARRIER] = "no-carrier",
3691 [LINK_OPERSTATE_DORMANT] = "dormant",
3692 [LINK_OPERSTATE_CARRIER] = "carrier",
3693 [LINK_OPERSTATE_DEGRADED] = "degraded",
3694 [LINK_OPERSTATE_ROUTABLE] = "routable",
3695 };
3696
3697 DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
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