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networkd: bump MTU to 1280 for interfaces which have IPv6 enabled (#3077)
[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-link.h"
32 #include "networkd-lldp-tx.h"
33 #include "networkd-netdev.h"
34 #include "set.h"
35 #include "socket-util.h"
36 #include "stdio-util.h"
37 #include "string-table.h"
38 #include "udev-util.h"
39 #include "util.h"
40 #include "virt.h"
41
42 static bool link_dhcp6_enabled(Link *link) {
43 assert(link);
44
45 if (link->flags & IFF_LOOPBACK)
46 return false;
47
48 if (!link->network)
49 return false;
50
51 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
52 }
53
54 static bool link_dhcp4_enabled(Link *link) {
55 assert(link);
56
57 if (link->flags & IFF_LOOPBACK)
58 return false;
59
60 if (!link->network)
61 return false;
62
63 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
64 }
65
66 static bool link_dhcp4_server_enabled(Link *link) {
67 assert(link);
68
69 if (link->flags & IFF_LOOPBACK)
70 return false;
71
72 if (!link->network)
73 return false;
74
75 return link->network->dhcp_server;
76 }
77
78 static bool link_ipv4ll_enabled(Link *link) {
79 assert(link);
80
81 if (link->flags & IFF_LOOPBACK)
82 return false;
83
84 if (!link->network)
85 return false;
86
87 return link->network->link_local & ADDRESS_FAMILY_IPV4;
88 }
89
90 static bool link_ipv6ll_enabled(Link *link) {
91 assert(link);
92
93 if (link->flags & IFF_LOOPBACK)
94 return false;
95
96 if (!link->network)
97 return false;
98
99 return link->network->link_local & ADDRESS_FAMILY_IPV6;
100 }
101
102 static bool link_ipv6_enabled(Link *link) {
103 assert(link);
104
105 if (!socket_ipv6_is_supported())
106 return false;
107
108 return link_dhcp6_enabled(link) || link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
109 }
110
111 static bool link_lldp_rx_enabled(Link *link) {
112 assert(link);
113
114 if (link->flags & IFF_LOOPBACK)
115 return false;
116
117 if (link->iftype != ARPHRD_ETHER)
118 return false;
119
120 if (!link->network)
121 return false;
122
123 if (link->network->bridge)
124 return false;
125
126 return link->network->lldp_mode != LLDP_MODE_NO;
127 }
128
129 static bool link_lldp_tx_enabled(Link *link) {
130 assert(link);
131
132 if (link->flags & IFF_LOOPBACK)
133 return false;
134
135 if (link->iftype != ARPHRD_ETHER)
136 return false;
137
138 if (!link->network)
139 return false;
140
141 return link->network->lldp_emit;
142 }
143
144 static bool link_ipv4_forward_enabled(Link *link) {
145 assert(link);
146
147 if (link->flags & IFF_LOOPBACK)
148 return false;
149
150 if (!link->network)
151 return false;
152
153 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
154 return false;
155
156 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
157 }
158
159 static bool link_ipv6_forward_enabled(Link *link) {
160 assert(link);
161
162 if (!socket_ipv6_is_supported())
163 return false;
164
165 if (link->flags & IFF_LOOPBACK)
166 return false;
167
168 if (!link->network)
169 return false;
170
171 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
172 return false;
173
174 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
175 }
176
177 static bool link_proxy_arp_enabled(Link *link) {
178 assert(link);
179
180 if (link->flags & IFF_LOOPBACK)
181 return false;
182
183 if (!link->network)
184 return false;
185
186 if (link->network->proxy_arp < 0)
187 return false;
188
189 return true;
190 }
191
192 static bool link_ipv6_accept_ra_enabled(Link *link) {
193 assert(link);
194
195 if (link->flags & IFF_LOOPBACK)
196 return false;
197
198 if (!link->network)
199 return false;
200
201 /* If unset use system default (enabled if local forwarding is disabled.
202 * disabled if local forwarding is enabled).
203 * If set, ignore or enforce RA independent of local forwarding state.
204 */
205 if (link->network->ipv6_accept_ra < 0)
206 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
207 return !link_ipv6_forward_enabled(link);
208 else if (link->network->ipv6_accept_ra > 0)
209 /* accept RA even if ip_forward is enabled */
210 return true;
211 else
212 /* ignore RA */
213 return false;
214 }
215
216 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
217
218 if (!socket_ipv6_is_supported())
219 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
220
221 if (link->flags & IFF_LOOPBACK)
222 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
223
224 if (!link->network)
225 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
226
227 return link->network->ipv6_privacy_extensions;
228 }
229
230 static int link_enable_ipv6(Link *link) {
231 const char *p = NULL;
232 bool disabled;
233 int r;
234
235 if (link->flags & IFF_LOOPBACK)
236 return 0;
237
238 disabled = !link_ipv6_enabled(link);
239
240 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/disable_ipv6");
241
242 r = write_string_file(p, one_zero(disabled), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
243 if (r < 0)
244 log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m", disabled ? "disable" : "enable", link->ifname);
245 else {
246 if (disabled)
247 log_link_info(link, "IPv6 disabled for interface: %m");
248 else
249 log_link_info(link, "IPv6 enabled for interface: %m");
250 }
251
252 return 0;
253 }
254
255 void link_update_operstate(Link *link) {
256 LinkOperationalState operstate;
257 assert(link);
258
259 if (link->kernel_operstate == IF_OPER_DORMANT)
260 operstate = LINK_OPERSTATE_DORMANT;
261 else if (link_has_carrier(link)) {
262 Address *address;
263 uint8_t scope = RT_SCOPE_NOWHERE;
264 Iterator i;
265
266 /* if we have carrier, check what addresses we have */
267 SET_FOREACH(address, link->addresses, i) {
268 if (!address_is_ready(address))
269 continue;
270
271 if (address->scope < scope)
272 scope = address->scope;
273 }
274
275 /* for operstate we also take foreign addresses into account */
276 SET_FOREACH(address, link->addresses_foreign, i) {
277 if (!address_is_ready(address))
278 continue;
279
280 if (address->scope < scope)
281 scope = address->scope;
282 }
283
284 if (scope < RT_SCOPE_SITE)
285 /* universally accessible addresses found */
286 operstate = LINK_OPERSTATE_ROUTABLE;
287 else if (scope < RT_SCOPE_HOST)
288 /* only link or site local addresses found */
289 operstate = LINK_OPERSTATE_DEGRADED;
290 else
291 /* no useful addresses found */
292 operstate = LINK_OPERSTATE_CARRIER;
293 } else if (link->flags & IFF_UP)
294 operstate = LINK_OPERSTATE_NO_CARRIER;
295 else
296 operstate = LINK_OPERSTATE_OFF;
297
298 if (link->operstate != operstate) {
299 link->operstate = operstate;
300 link_send_changed(link, "OperationalState", NULL);
301 link_dirty(link);
302 manager_dirty(link->manager);
303 }
304 }
305
306 #define FLAG_STRING(string, flag, old, new) \
307 (((old ^ new) & flag) \
308 ? ((old & flag) ? (" -" string) : (" +" string)) \
309 : "")
310
311 static int link_update_flags(Link *link, sd_netlink_message *m) {
312 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
313 uint8_t operstate;
314 int r;
315
316 assert(link);
317
318 r = sd_rtnl_message_link_get_flags(m, &flags);
319 if (r < 0)
320 return log_link_warning_errno(link, r, "Could not get link flags: %m");
321
322 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
323 if (r < 0)
324 /* if we got a message without operstate, take it to mean
325 the state was unchanged */
326 operstate = link->kernel_operstate;
327
328 if ((link->flags == flags) && (link->kernel_operstate == operstate))
329 return 0;
330
331 if (link->flags != flags) {
332 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",
333 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
334 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
335 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
336 FLAG_STRING("UP", IFF_UP, link->flags, flags),
337 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
338 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
339 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
340 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
341 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
342 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
343 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
344 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
345 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
346 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
347 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
348 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
349 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
350 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
351 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
352
353 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
354 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
355 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
356 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
357 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
358 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
359 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
360 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
361
362 /* link flags are currently at most 18 bits, let's align to
363 * printing 20 */
364 if (unknown_flags_added)
365 log_link_debug(link,
366 "Unknown link flags gained: %#.5x (ignoring)",
367 unknown_flags_added);
368
369 if (unknown_flags_removed)
370 log_link_debug(link,
371 "Unknown link flags lost: %#.5x (ignoring)",
372 unknown_flags_removed);
373 }
374
375 link->flags = flags;
376 link->kernel_operstate = operstate;
377
378 link_update_operstate(link);
379
380 return 0;
381 }
382
383 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
384 _cleanup_link_unref_ Link *link = NULL;
385 uint16_t type;
386 const char *ifname;
387 int r, ifindex;
388 unsigned short iftype;
389
390 assert(manager);
391 assert(message);
392 assert(ret);
393
394 r = sd_netlink_message_get_type(message, &type);
395 if (r < 0)
396 return r;
397 else if (type != RTM_NEWLINK)
398 return -EINVAL;
399
400 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
401 if (r < 0)
402 return r;
403 else if (ifindex <= 0)
404 return -EINVAL;
405
406 r = sd_rtnl_message_link_get_type(message, &iftype);
407 if (r < 0)
408 return r;
409
410 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
411 if (r < 0)
412 return r;
413
414 link = new0(Link, 1);
415 if (!link)
416 return -ENOMEM;
417
418 link->n_ref = 1;
419 link->manager = manager;
420 link->state = LINK_STATE_PENDING;
421 link->rtnl_extended_attrs = true;
422 link->ifindex = ifindex;
423 link->iftype = iftype;
424 link->ifname = strdup(ifname);
425 if (!link->ifname)
426 return -ENOMEM;
427
428 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
429 if (r < 0)
430 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
431
432 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
433 return -ENOMEM;
434
435 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
436 return -ENOMEM;
437
438 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
439 return -ENOMEM;
440
441 r = hashmap_ensure_allocated(&manager->links, NULL);
442 if (r < 0)
443 return r;
444
445 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
446 if (r < 0)
447 return r;
448
449 r = link_update_flags(link, message);
450 if (r < 0)
451 return r;
452
453 *ret = link;
454 link = NULL;
455
456 return 0;
457 }
458
459 static void link_free(Link *link) {
460 Address *address;
461 Iterator i;
462 Link *carrier;
463
464 if (!link)
465 return;
466
467 while (!set_isempty(link->addresses))
468 address_free(set_first(link->addresses));
469
470 while (!set_isempty(link->addresses_foreign))
471 address_free(set_first(link->addresses_foreign));
472
473 link->addresses = set_free(link->addresses);
474
475 link->addresses_foreign = set_free(link->addresses_foreign);
476
477 while ((address = link->pool_addresses)) {
478 LIST_REMOVE(addresses, link->pool_addresses, address);
479 address_free(address);
480 }
481
482 sd_dhcp_server_unref(link->dhcp_server);
483 sd_dhcp_client_unref(link->dhcp_client);
484 sd_dhcp_lease_unref(link->dhcp_lease);
485
486 link_lldp_tx_stop(link);
487
488 free(link->lease_file);
489
490 sd_lldp_unref(link->lldp);
491 free(link->lldp_file);
492
493 sd_ipv4ll_unref(link->ipv4ll);
494 sd_dhcp6_client_unref(link->dhcp6_client);
495 sd_ndisc_unref(link->ndisc_router_discovery);
496
497 if (link->manager)
498 hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex));
499
500 free(link->ifname);
501
502 (void)unlink(link->state_file);
503 free(link->state_file);
504
505 udev_device_unref(link->udev_device);
506
507 HASHMAP_FOREACH (carrier, link->bound_to_links, i)
508 hashmap_remove(link->bound_to_links, INT_TO_PTR(carrier->ifindex));
509 hashmap_free(link->bound_to_links);
510
511 HASHMAP_FOREACH (carrier, link->bound_by_links, i)
512 hashmap_remove(link->bound_by_links, INT_TO_PTR(carrier->ifindex));
513 hashmap_free(link->bound_by_links);
514
515 free(link);
516 }
517
518 Link *link_unref(Link *link) {
519 if (!link)
520 return NULL;
521
522 assert(link->n_ref > 0);
523
524 link->n_ref--;
525
526 if (link->n_ref > 0)
527 return NULL;
528
529 link_free(link);
530
531 return NULL;
532 }
533
534 Link *link_ref(Link *link) {
535 if (!link)
536 return NULL;
537
538 assert(link->n_ref > 0);
539
540 link->n_ref++;
541
542 return link;
543 }
544
545 int link_get(Manager *m, int ifindex, Link **ret) {
546 Link *link;
547
548 assert(m);
549 assert(ifindex);
550 assert(ret);
551
552 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
553 if (!link)
554 return -ENODEV;
555
556 *ret = link;
557
558 return 0;
559 }
560
561 static void link_set_state(Link *link, LinkState state) {
562 assert(link);
563
564 if (link->state == state)
565 return;
566
567 link->state = state;
568
569 link_send_changed(link, "AdministrativeState", NULL);
570
571 return;
572 }
573
574 static void link_enter_unmanaged(Link *link) {
575 assert(link);
576
577 log_link_debug(link, "Unmanaged");
578
579 link_set_state(link, LINK_STATE_UNMANAGED);
580
581 link_dirty(link);
582 }
583
584 static int link_stop_clients(Link *link) {
585 int r = 0, k;
586
587 assert(link);
588 assert(link->manager);
589 assert(link->manager->event);
590
591 if (link->dhcp_client) {
592 k = sd_dhcp_client_stop(link->dhcp_client);
593 if (k < 0)
594 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
595 }
596
597 if (link->ipv4ll) {
598 k = sd_ipv4ll_stop(link->ipv4ll);
599 if (k < 0)
600 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
601 }
602
603 if (link->dhcp6_client) {
604 k = sd_dhcp6_client_stop(link->dhcp6_client);
605 if (k < 0)
606 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
607 }
608
609 if (link->ndisc_router_discovery) {
610 k = sd_ndisc_stop(link->ndisc_router_discovery);
611 if (k < 0)
612 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
613 }
614
615 link_lldp_tx_stop(link);
616 return r;
617 }
618
619 void link_enter_failed(Link *link) {
620 assert(link);
621
622 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
623 return;
624
625 log_link_warning(link, "Failed");
626
627 link_set_state(link, LINK_STATE_FAILED);
628
629 link_stop_clients(link);
630
631 link_dirty(link);
632 }
633
634 static Address* link_find_dhcp_server_address(Link *link) {
635 Address *address;
636
637 assert(link);
638 assert(link->network);
639
640 /* The first statically configured address if there is any */
641 LIST_FOREACH(addresses, address, link->network->static_addresses) {
642
643 if (address->family != AF_INET)
644 continue;
645
646 if (in_addr_is_null(address->family, &address->in_addr))
647 continue;
648
649 return address;
650 }
651
652 /* If that didn't work, find a suitable address we got from the pool */
653 LIST_FOREACH(addresses, address, link->pool_addresses) {
654 if (address->family != AF_INET)
655 continue;
656
657 return address;
658 }
659
660 return NULL;
661 }
662
663 static int link_enter_configured(Link *link) {
664 assert(link);
665 assert(link->network);
666 assert(link->state == LINK_STATE_SETTING_ROUTES);
667
668 log_link_info(link, "Configured");
669
670 link_set_state(link, LINK_STATE_CONFIGURED);
671
672 link_dirty(link);
673
674 return 0;
675 }
676
677 void link_check_ready(Link *link) {
678 Address *a;
679 Iterator i;
680
681 assert(link);
682
683 if (!link->network)
684 return;
685
686 if (!link->static_configured)
687 return;
688
689 if (link_ipv4ll_enabled(link))
690 if (!link->ipv4ll_address ||
691 !link->ipv4ll_route)
692 return;
693
694 if (link_ipv6ll_enabled(link))
695 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) > 0)
696 return;
697
698 if ((link_dhcp4_enabled(link) && !link_dhcp6_enabled(link) &&
699 !link->dhcp4_configured) ||
700 (link_dhcp6_enabled(link) && !link_dhcp4_enabled(link) &&
701 !link->dhcp6_configured) ||
702 (link_dhcp4_enabled(link) && link_dhcp6_enabled(link) &&
703 !link->dhcp4_configured && !link->dhcp6_configured))
704 return;
705
706 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
707 return;
708
709 SET_FOREACH(a, link->addresses, i)
710 if (!address_is_ready(a))
711 return;
712
713 if (link->state != LINK_STATE_CONFIGURED)
714 link_enter_configured(link);
715
716 return;
717 }
718
719 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
720 _cleanup_link_unref_ Link *link = userdata;
721 int r;
722
723 assert(link->link_messages > 0);
724 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
725 LINK_STATE_SETTING_ROUTES, LINK_STATE_FAILED,
726 LINK_STATE_LINGER));
727
728 link->link_messages--;
729
730 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
731 return 1;
732
733 r = sd_netlink_message_get_errno(m);
734 if (r < 0 && r != -EEXIST)
735 log_link_warning_errno(link, r, "Could not set route: %m");
736
737 if (link->link_messages == 0) {
738 log_link_debug(link, "Routes set");
739 link->static_configured = true;
740 link_check_ready(link);
741 }
742
743 return 1;
744 }
745
746 static int link_enter_set_routes(Link *link) {
747 Route *rt;
748 int r;
749
750 assert(link);
751 assert(link->network);
752 assert(link->state == LINK_STATE_SETTING_ADDRESSES);
753
754 link_set_state(link, LINK_STATE_SETTING_ROUTES);
755
756 LIST_FOREACH(routes, rt, link->network->static_routes) {
757 r = route_configure(rt, link, &route_handler);
758 if (r < 0) {
759 log_link_warning_errno(link, r, "Could not set routes: %m");
760 link_enter_failed(link);
761 return r;
762 }
763
764 link->link_messages++;
765 }
766
767 if (link->link_messages == 0) {
768 link->static_configured = true;
769 link_check_ready(link);
770 } else
771 log_link_debug(link, "Setting routes");
772
773 return 0;
774 }
775
776 int link_route_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
777 _cleanup_link_unref_ Link *link = userdata;
778 int r;
779
780 assert(m);
781 assert(link);
782 assert(link->ifname);
783
784 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
785 return 1;
786
787 r = sd_netlink_message_get_errno(m);
788 if (r < 0 && r != -ESRCH)
789 log_link_warning_errno(link, r, "Could not drop route: %m");
790
791 return 1;
792 }
793
794 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
795 _cleanup_link_unref_ Link *link = userdata;
796 int r;
797
798 assert(rtnl);
799 assert(m);
800 assert(link);
801 assert(link->ifname);
802 assert(link->link_messages > 0);
803 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
804 LINK_STATE_FAILED, LINK_STATE_LINGER));
805
806 link->link_messages--;
807
808 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
809 return 1;
810
811 r = sd_netlink_message_get_errno(m);
812 if (r < 0 && r != -EEXIST)
813 log_link_warning_errno(link, r, "could not set address: %m");
814 else if (r >= 0)
815 manager_rtnl_process_address(rtnl, m, link->manager);
816
817 if (link->link_messages == 0) {
818 log_link_debug(link, "Addresses set");
819 link_enter_set_routes(link);
820 }
821
822 return 1;
823 }
824
825 static int link_push_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
826 _cleanup_free_ struct in_addr *addresses = NULL;
827 size_t n_addresses = 0, n_allocated = 0;
828 char **a;
829
830 log_debug("Copying DNS server information from %s", link->ifname);
831
832 if (!link->network)
833 return 0;
834
835 STRV_FOREACH(a, link->network->dns) {
836 struct in_addr ia;
837
838 /* Only look for IPv4 addresses */
839 if (inet_pton(AF_INET, *a, &ia) <= 0)
840 continue;
841
842 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
843 return log_oom();
844
845 addresses[n_addresses++] = ia;
846 }
847
848 if (link->network->dhcp_use_dns &&
849 link->dhcp_lease) {
850 const struct in_addr *da = NULL;
851 int n;
852
853 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
854 if (n > 0) {
855
856 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
857 return log_oom();
858
859 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
860 n_addresses += n;
861 }
862 }
863
864 if (n_addresses <= 0)
865 return 0;
866
867 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
868 }
869
870 static int link_push_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
871 _cleanup_free_ struct in_addr *addresses = NULL;
872 size_t n_addresses = 0, n_allocated = 0;
873 char **a;
874
875 if (!link->network)
876 return 0;
877
878 log_debug("Copying NTP server information from %s", link->ifname);
879
880 STRV_FOREACH(a, link->network->ntp) {
881 struct in_addr ia;
882
883 /* Only look for IPv4 addresses */
884 if (inet_pton(AF_INET, *a, &ia) <= 0)
885 continue;
886
887 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
888 return log_oom();
889
890 addresses[n_addresses++] = ia;
891 }
892
893 if (link->network->dhcp_use_ntp &&
894 link->dhcp_lease) {
895 const struct in_addr *da = NULL;
896 int n;
897
898 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
899 if (n > 0) {
900
901 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
902 return log_oom();
903
904 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
905 n_addresses += n;
906 }
907 }
908
909 if (n_addresses <= 0)
910 return 0;
911
912 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
913 }
914
915 static int link_enter_set_addresses(Link *link) {
916 Address *ad;
917 int r;
918
919 assert(link);
920 assert(link->network);
921 assert(link->state != _LINK_STATE_INVALID);
922
923 link_set_state(link, LINK_STATE_SETTING_ADDRESSES);
924
925 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
926 r = address_configure(ad, link, &address_handler, false);
927 if (r < 0) {
928 log_link_warning_errno(link, r, "Could not set addresses: %m");
929 link_enter_failed(link);
930 return r;
931 }
932
933 link->link_messages++;
934 }
935
936 /* now that we can figure out a default address for the dhcp server,
937 start it */
938 if (link_dhcp4_server_enabled(link)) {
939 Address *address;
940 Link *uplink = NULL;
941 bool acquired_uplink = false;
942
943 address = link_find_dhcp_server_address(link);
944 if (!address) {
945 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
946 link_enter_failed(link);
947 return 0;
948 }
949
950 /* use the server address' subnet as the pool */
951 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
952 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
953 if (r < 0)
954 return r;
955
956 /* TODO:
957 r = sd_dhcp_server_set_router(link->dhcp_server,
958 &main_address->in_addr.in);
959 if (r < 0)
960 return r;
961 */
962
963 if (link->network->dhcp_server_max_lease_time_usec > 0) {
964 r = sd_dhcp_server_set_max_lease_time(
965 link->dhcp_server,
966 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
967 if (r < 0)
968 return r;
969 }
970
971 if (link->network->dhcp_server_default_lease_time_usec > 0) {
972 r = sd_dhcp_server_set_default_lease_time(
973 link->dhcp_server,
974 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
975 if (r < 0)
976 return r;
977 }
978
979 if (link->network->dhcp_server_emit_dns) {
980
981 if (link->network->n_dhcp_server_dns > 0)
982 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
983 else {
984 uplink = manager_find_uplink(link->manager, link);
985 acquired_uplink = true;
986
987 if (!uplink) {
988 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
989 r = 0;
990 } else
991 r = link_push_dns_to_dhcp_server(uplink, link->dhcp_server);
992 }
993 if (r < 0)
994 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
995 }
996
997
998 if (link->network->dhcp_server_emit_ntp) {
999
1000 if (link->network->n_dhcp_server_ntp > 0)
1001 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1002 else {
1003 if (!acquired_uplink)
1004 uplink = manager_find_uplink(link->manager, link);
1005
1006 if (!uplink) {
1007 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1008 r = 0;
1009 } else
1010 r = link_push_ntp_to_dhcp_server(uplink, link->dhcp_server);
1011
1012 }
1013 if (r < 0)
1014 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1015 }
1016
1017 if (link->network->dhcp_server_emit_timezone) {
1018 _cleanup_free_ char *buffer = NULL;
1019 const char *tz = NULL;
1020
1021 if (link->network->dhcp_server_timezone)
1022 tz = link->network->dhcp_server_timezone;
1023 else {
1024 r = get_timezone(&buffer);
1025 if (r < 0)
1026 log_warning_errno(r, "Failed to determine timezone: %m");
1027 else
1028 tz = buffer;
1029 }
1030
1031 if (tz) {
1032 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1033 if (r < 0)
1034 return r;
1035 }
1036 }
1037
1038 r = sd_dhcp_server_start(link->dhcp_server);
1039 if (r < 0) {
1040 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1041
1042 link_enter_failed(link);
1043
1044 return 0;
1045 }
1046
1047 log_link_debug(link, "Offering DHCPv4 leases");
1048 }
1049
1050 if (link->link_messages == 0)
1051 link_enter_set_routes(link);
1052 else
1053 log_link_debug(link, "Setting addresses");
1054
1055 return 0;
1056 }
1057
1058 int link_address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1059 _cleanup_link_unref_ Link *link = userdata;
1060 int r;
1061
1062 assert(m);
1063 assert(link);
1064 assert(link->ifname);
1065
1066 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1067 return 1;
1068
1069 r = sd_netlink_message_get_errno(m);
1070 if (r < 0 && r != -EADDRNOTAVAIL)
1071 log_link_warning_errno(link, r, "Could not drop address: %m");
1072
1073 return 1;
1074 }
1075
1076 static int link_set_bridge_fdb(Link *const link) {
1077 FdbEntry *fdb_entry;
1078 int r = 0;
1079
1080 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1081 r = fdb_entry_configure(link, fdb_entry);
1082 if (r < 0) {
1083 log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1084 break;
1085 }
1086 }
1087
1088 return r;
1089 }
1090
1091 static int link_set_proxy_arp(Link *const link) {
1092 const char *p = NULL;
1093 int r;
1094
1095 if (!link_proxy_arp_enabled(link))
1096 return 0;
1097
1098 p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/proxy_arp");
1099
1100 r = write_string_file(p, one_zero(link->network->proxy_arp), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
1101 if (r < 0)
1102 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1103
1104 return 0;
1105 }
1106
1107 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1108 _cleanup_link_unref_ Link *link = userdata;
1109 int r;
1110
1111 log_link_debug(link, "Set link");
1112
1113 r = sd_netlink_message_get_errno(m);
1114 if (r < 0 && r != -EEXIST) {
1115 log_link_error_errno(link, r, "Could not join netdev: %m");
1116 link_enter_failed(link);
1117 return 1;
1118 }
1119
1120 return 0;
1121 }
1122
1123 static int set_hostname_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
1124 _cleanup_link_unref_ Link *link = userdata;
1125 const sd_bus_error *e;
1126
1127 assert(m);
1128 assert(link);
1129
1130 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1131 return 1;
1132
1133 e = sd_bus_message_get_error(m);
1134 if (e)
1135 log_link_warning_errno(link, sd_bus_error_get_errno(e), "Could not set hostname: %s", e->message);
1136
1137 return 1;
1138 }
1139
1140 int link_set_hostname(Link *link, const char *hostname) {
1141 int r;
1142
1143 assert(link);
1144 assert(link->manager);
1145
1146 log_link_debug(link, "Setting transient hostname: '%s'", strna(hostname));
1147
1148 if (!link->manager->bus) {
1149 /* TODO: replace by assert when we can rely on kdbus */
1150 log_link_info(link, "Not connected to system bus, ignoring transient hostname.");
1151 return 0;
1152 }
1153
1154 r = sd_bus_call_method_async(
1155 link->manager->bus,
1156 NULL,
1157 "org.freedesktop.hostname1",
1158 "/org/freedesktop/hostname1",
1159 "org.freedesktop.hostname1",
1160 "SetHostname",
1161 set_hostname_handler,
1162 link,
1163 "sb",
1164 hostname,
1165 false);
1166
1167 if (r < 0)
1168 return log_link_error_errno(link, r, "Could not set transient hostname: %m");
1169
1170 link_ref(link);
1171
1172 return 0;
1173 }
1174
1175 static int set_timezone_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
1176 _cleanup_link_unref_ Link *link = userdata;
1177 const sd_bus_error *e;
1178
1179 assert(m);
1180 assert(link);
1181
1182 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1183 return 1;
1184
1185 e = sd_bus_message_get_error(m);
1186 if (e)
1187 log_link_warning_errno(link, sd_bus_error_get_errno(e), "Could not set timezone: %s", e->message);
1188
1189 return 1;
1190 }
1191
1192 int link_set_timezone(Link *link, const char *tz) {
1193 int r;
1194
1195 assert(link);
1196 assert(link->manager);
1197 assert(tz);
1198
1199 log_link_debug(link, "Setting system timezone: '%s'", tz);
1200
1201 if (!link->manager->bus) {
1202 log_link_info(link, "Not connected to system bus, ignoring timezone.");
1203 return 0;
1204 }
1205
1206 r = sd_bus_call_method_async(
1207 link->manager->bus,
1208 NULL,
1209 "org.freedesktop.timedate1",
1210 "/org/freedesktop/timedate1",
1211 "org.freedesktop.timedate1",
1212 "SetTimezone",
1213 set_timezone_handler,
1214 link,
1215 "sb",
1216 tz,
1217 false);
1218 if (r < 0)
1219 return log_link_error_errno(link, r, "Could not set timezone: %m");
1220
1221 link_ref(link);
1222
1223 return 0;
1224 }
1225
1226 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1227 _cleanup_link_unref_ Link *link = userdata;
1228 int r;
1229
1230 assert(m);
1231 assert(link);
1232 assert(link->ifname);
1233
1234 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1235 return 1;
1236
1237 r = sd_netlink_message_get_errno(m);
1238 if (r < 0)
1239 log_link_warning_errno(link, r, "Could not set MTU: %m");
1240
1241 return 1;
1242 }
1243
1244 int link_set_mtu(Link *link, uint32_t mtu) {
1245 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1246 int r;
1247
1248 assert(link);
1249 assert(link->manager);
1250 assert(link->manager->rtnl);
1251
1252 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1253
1254 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1255 if (r < 0)
1256 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1257
1258 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1259 if (r < 0)
1260 return log_link_error_errno(link, r, "Could not append MTU: %m");
1261
1262 r = sd_netlink_call_async(link->manager->rtnl, req, set_mtu_handler, link, 0, NULL);
1263 if (r < 0)
1264 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1265
1266 link_ref(link);
1267
1268 return 0;
1269 }
1270
1271 static int link_set_bridge(Link *link) {
1272 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1273 int r;
1274
1275 assert(link);
1276 assert(link->network);
1277
1278 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1279 if (r < 0)
1280 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1281
1282 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1283 if (r < 0)
1284 return log_link_error_errno(link, r, "Could not set message family: %m");
1285
1286 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1287 if (r < 0)
1288 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1289
1290 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, !link->network->use_bpdu);
1291 if (r < 0)
1292 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1293
1294 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1295 if (r < 0)
1296 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1297
1298 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1299 if (r < 0)
1300 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1301
1302 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, !link->network->allow_port_to_be_root);
1303 if (r < 0)
1304 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1305
1306 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1307 if (r < 0)
1308 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1309
1310 if (link->network->cost != 0) {
1311 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1312 if (r < 0)
1313 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1314 }
1315
1316 r = sd_netlink_message_close_container(req);
1317 if (r < 0)
1318 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1319
1320 r = sd_netlink_call_async(link->manager->rtnl, req, link_set_handler, link, 0, NULL);
1321 if (r < 0)
1322 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1323
1324 link_ref(link);
1325
1326 return r;
1327 }
1328
1329 static int link_lldp_save(Link *link) {
1330 _cleanup_free_ char *temp_path = NULL;
1331 _cleanup_fclose_ FILE *f = NULL;
1332 sd_lldp_neighbor **l = NULL;
1333 int n = 0, r, i;
1334
1335 assert(link);
1336 assert(link->lldp_file);
1337
1338 if (!link->lldp) {
1339 (void) unlink(link->lldp_file);
1340 return 0;
1341 }
1342
1343 r = sd_lldp_get_neighbors(link->lldp, &l);
1344 if (r < 0)
1345 goto finish;
1346 if (r == 0) {
1347 (void) unlink(link->lldp_file);
1348 goto finish;
1349 }
1350
1351 n = r;
1352
1353 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1354 if (r < 0)
1355 goto finish;
1356
1357 fchmod(fileno(f), 0644);
1358
1359 for (i = 0; i < n; i++) {
1360 const void *p;
1361 le64_t u;
1362 size_t sz;
1363
1364 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1365 if (r < 0)
1366 goto finish;
1367
1368 u = htole64(sz);
1369 (void) fwrite(&u, 1, sizeof(u), f);
1370 (void) fwrite(p, 1, sz, f);
1371 }
1372
1373 r = fflush_and_check(f);
1374 if (r < 0)
1375 goto finish;
1376
1377 if (rename(temp_path, link->lldp_file) < 0) {
1378 r = -errno;
1379 goto finish;
1380 }
1381
1382 finish:
1383 if (r < 0) {
1384 (void) unlink(link->lldp_file);
1385 if (temp_path)
1386 (void) unlink(temp_path);
1387
1388 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1389 }
1390
1391 if (l) {
1392 for (i = 0; i < n; i++)
1393 sd_lldp_neighbor_unref(l[i]);
1394 free(l);
1395 }
1396
1397 return r;
1398 }
1399
1400 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1401 Link *link = userdata;
1402 int r;
1403
1404 assert(link);
1405
1406 (void) link_lldp_save(link);
1407
1408 if (link_lldp_tx_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1409 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1410
1411 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1412
1413 r = link_lldp_tx_start(link);
1414 if (r < 0)
1415 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1416 }
1417 }
1418
1419 static int link_acquire_ipv6_conf(Link *link) {
1420 int r;
1421
1422 assert(link);
1423
1424 if (link_dhcp6_enabled(link)) {
1425 assert(link->dhcp6_client);
1426 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1427
1428 log_link_debug(link, "Acquiring DHCPv6 lease");
1429
1430 r = sd_dhcp6_client_set_local_address(link->dhcp6_client, &link->ipv6ll_address);
1431 if (r < 0 && r != -EBUSY)
1432 return log_link_warning_errno(link, r, "Could not set IPv6LL address in DHCP client: %m");
1433
1434 r = sd_dhcp6_client_start(link->dhcp6_client);
1435 if (r < 0 && r != -EBUSY)
1436 return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m");
1437 }
1438
1439 if (link_ipv6_accept_ra_enabled(link)) {
1440 assert(link->ndisc_router_discovery);
1441
1442 log_link_debug(link, "Discovering IPv6 routers");
1443
1444 r = sd_ndisc_router_discovery_start(link->ndisc_router_discovery);
1445 if (r < 0 && r != -EBUSY)
1446 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1447 }
1448
1449 return 0;
1450 }
1451
1452 static int link_acquire_conf(Link *link) {
1453 int r;
1454
1455 assert(link);
1456 assert(link->network);
1457 assert(link->manager);
1458 assert(link->manager->event);
1459
1460 if (link_ipv4ll_enabled(link)) {
1461 assert(link->ipv4ll);
1462
1463 log_link_debug(link, "Acquiring IPv4 link-local address");
1464
1465 r = sd_ipv4ll_start(link->ipv4ll);
1466 if (r < 0)
1467 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1468 }
1469
1470 if (link_dhcp4_enabled(link)) {
1471 assert(link->dhcp_client);
1472
1473 log_link_debug(link, "Acquiring DHCPv4 lease");
1474
1475 r = sd_dhcp_client_start(link->dhcp_client);
1476 if (r < 0)
1477 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1478 }
1479
1480 if (link_lldp_tx_enabled(link)) {
1481 r = link_lldp_tx_start(link);
1482 if (r < 0)
1483 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1484 }
1485
1486 return 0;
1487 }
1488
1489 bool link_has_carrier(Link *link) {
1490 /* see Documentation/networking/operstates.txt in the kernel sources */
1491
1492 if (link->kernel_operstate == IF_OPER_UP)
1493 return true;
1494
1495 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1496 /* operstate may not be implemented, so fall back to flags */
1497 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1498 return true;
1499
1500 return false;
1501 }
1502
1503 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1504 _cleanup_link_unref_ Link *link = userdata;
1505 int r;
1506
1507 assert(link);
1508
1509 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1510 return 1;
1511
1512 r = sd_netlink_message_get_errno(m);
1513 if (r < 0)
1514 /* we warn but don't fail the link, as it may be
1515 brought up later */
1516 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1517
1518 return 1;
1519 }
1520
1521 static int link_up(Link *link) {
1522 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1523 uint8_t ipv6ll_mode;
1524 int r;
1525
1526 assert(link);
1527 assert(link->network);
1528 assert(link->manager);
1529 assert(link->manager->rtnl);
1530
1531 log_link_debug(link, "Bringing link up");
1532
1533 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1534 if (r < 0)
1535 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1536
1537 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1538 if (r < 0)
1539 return log_link_error_errno(link, r, "Could not set link flags: %m");
1540
1541 if (link->network->mac) {
1542 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1543 if (r < 0)
1544 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1545 }
1546
1547 /* If IPv6 not configured (no static IPv6 address and neither DHCPv6 nor IPv6LL is enabled)
1548 for this interface then disable IPv6 else enable it. */
1549 (void) link_enable_ipv6(link);
1550
1551 if (link->network->mtu) {
1552 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1553 on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1554 if (link_ipv6_enabled(link) && link->network->mtu < IPV6_MIN_MTU) {
1555
1556 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1557 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1558
1559 link->network->mtu = IPV6_MIN_MTU;
1560 }
1561
1562 r = sd_netlink_message_append_u32(req, IFLA_MTU, link->network->mtu);
1563 if (r < 0)
1564 return log_link_error_errno(link, r, "Could not set MTU: %m");
1565 }
1566
1567 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1568 if (r < 0)
1569 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1570
1571 if (link_ipv6_enabled(link)) {
1572 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
1573 r = sd_netlink_message_open_container(req, AF_INET6);
1574 if (r < 0)
1575 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1576
1577 ipv6ll_mode = link_ipv6ll_enabled(link) ? IN6_ADDR_GEN_MODE_EUI64 : IN6_ADDR_GEN_MODE_NONE;
1578 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1579 if (r < 0)
1580 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1581
1582 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
1583 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
1584 if (r < 0)
1585 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
1586 }
1587
1588 r = sd_netlink_message_close_container(req);
1589 if (r < 0)
1590 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1591 }
1592
1593 r = sd_netlink_message_close_container(req);
1594 if (r < 0)
1595 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1596
1597 r = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
1598 if (r < 0)
1599 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1600
1601 link_ref(link);
1602
1603 return 0;
1604 }
1605
1606 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1607 _cleanup_link_unref_ Link *link = userdata;
1608 int r;
1609
1610 assert(link);
1611
1612 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1613 return 1;
1614
1615 r = sd_netlink_message_get_errno(m);
1616 if (r < 0)
1617 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1618
1619 return 1;
1620 }
1621
1622 static int link_down(Link *link) {
1623 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1624 int r;
1625
1626 assert(link);
1627 assert(link->manager);
1628 assert(link->manager->rtnl);
1629
1630 log_link_debug(link, "Bringing link down");
1631
1632 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1633 RTM_SETLINK, link->ifindex);
1634 if (r < 0)
1635 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1636
1637 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1638 if (r < 0)
1639 return log_link_error_errno(link, r, "Could not set link flags: %m");
1640
1641 r = sd_netlink_call_async(link->manager->rtnl, req, link_down_handler, link, 0, NULL);
1642 if (r < 0)
1643 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1644
1645 link_ref(link);
1646
1647 return 0;
1648 }
1649
1650 static int link_handle_bound_to_list(Link *link) {
1651 Link *l;
1652 Iterator i;
1653 int r;
1654 bool required_up = false;
1655 bool link_is_up = false;
1656
1657 assert(link);
1658
1659 if (hashmap_isempty(link->bound_to_links))
1660 return 0;
1661
1662 if (link->flags & IFF_UP)
1663 link_is_up = true;
1664
1665 HASHMAP_FOREACH (l, link->bound_to_links, i)
1666 if (link_has_carrier(l)) {
1667 required_up = true;
1668 break;
1669 }
1670
1671 if (!required_up && link_is_up) {
1672 r = link_down(link);
1673 if (r < 0)
1674 return r;
1675 } else if (required_up && !link_is_up) {
1676 r = link_up(link);
1677 if (r < 0)
1678 return r;
1679 }
1680
1681 return 0;
1682 }
1683
1684 static int link_handle_bound_by_list(Link *link) {
1685 Iterator i;
1686 Link *l;
1687 int r;
1688
1689 assert(link);
1690
1691 if (hashmap_isempty(link->bound_by_links))
1692 return 0;
1693
1694 HASHMAP_FOREACH (l, link->bound_by_links, i) {
1695 r = link_handle_bound_to_list(l);
1696 if (r < 0)
1697 return r;
1698 }
1699
1700 return 0;
1701 }
1702
1703 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1704 int r;
1705
1706 assert(link);
1707 assert(carrier);
1708
1709 if (link == carrier)
1710 return 0;
1711
1712 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1713 return 0;
1714
1715 r = hashmap_ensure_allocated(h, NULL);
1716 if (r < 0)
1717 return r;
1718
1719 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1720 if (r < 0)
1721 return r;
1722
1723 return 0;
1724 }
1725
1726 static int link_new_bound_by_list(Link *link) {
1727 Manager *m;
1728 Link *carrier;
1729 Iterator i;
1730 int r;
1731 bool list_updated = false;
1732
1733 assert(link);
1734 assert(link->manager);
1735
1736 m = link->manager;
1737
1738 HASHMAP_FOREACH(carrier, m->links, i) {
1739 if (!carrier->network)
1740 continue;
1741
1742 if (strv_isempty(carrier->network->bind_carrier))
1743 continue;
1744
1745 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
1746 r = link_put_carrier(link, carrier, &link->bound_by_links);
1747 if (r < 0)
1748 return r;
1749
1750 list_updated = true;
1751 }
1752 }
1753
1754 if (list_updated)
1755 link_dirty(link);
1756
1757 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
1758 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1759 if (r < 0)
1760 return r;
1761
1762 link_dirty(carrier);
1763 }
1764
1765 return 0;
1766 }
1767
1768 static int link_new_bound_to_list(Link *link) {
1769 Manager *m;
1770 Link *carrier;
1771 Iterator i;
1772 int r;
1773 bool list_updated = false;
1774
1775 assert(link);
1776 assert(link->manager);
1777
1778 if (!link->network)
1779 return 0;
1780
1781 if (strv_isempty(link->network->bind_carrier))
1782 return 0;
1783
1784 m = link->manager;
1785
1786 HASHMAP_FOREACH (carrier, m->links, i) {
1787 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
1788 r = link_put_carrier(link, carrier, &link->bound_to_links);
1789 if (r < 0)
1790 return r;
1791
1792 list_updated = true;
1793 }
1794 }
1795
1796 if (list_updated)
1797 link_dirty(link);
1798
1799 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
1800 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
1801 if (r < 0)
1802 return r;
1803
1804 link_dirty(carrier);
1805 }
1806
1807 return 0;
1808 }
1809
1810 static int link_new_carrier_maps(Link *link) {
1811 int r;
1812
1813 r = link_new_bound_by_list(link);
1814 if (r < 0)
1815 return r;
1816
1817 r = link_handle_bound_by_list(link);
1818 if (r < 0)
1819 return r;
1820
1821 r = link_new_bound_to_list(link);
1822 if (r < 0)
1823 return r;
1824
1825 r = link_handle_bound_to_list(link);
1826 if (r < 0)
1827 return r;
1828
1829 return 0;
1830 }
1831
1832 static void link_free_bound_to_list(Link *link) {
1833 Link *bound_to;
1834 Iterator i;
1835
1836 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
1837 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
1838
1839 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
1840 link_dirty(bound_to);
1841 }
1842
1843 return;
1844 }
1845
1846 static void link_free_bound_by_list(Link *link) {
1847 Link *bound_by;
1848 Iterator i;
1849
1850 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
1851 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
1852
1853 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
1854 link_dirty(bound_by);
1855 link_handle_bound_to_list(bound_by);
1856 }
1857 }
1858
1859 return;
1860 }
1861
1862 static void link_free_carrier_maps(Link *link) {
1863 bool list_updated = false;
1864
1865 assert(link);
1866
1867 if (!hashmap_isempty(link->bound_to_links)) {
1868 link_free_bound_to_list(link);
1869 list_updated = true;
1870 }
1871
1872 if (!hashmap_isempty(link->bound_by_links)) {
1873 link_free_bound_by_list(link);
1874 list_updated = true;
1875 }
1876
1877 if (list_updated)
1878 link_dirty(link);
1879
1880 return;
1881 }
1882
1883 void link_drop(Link *link) {
1884 if (!link || link->state == LINK_STATE_LINGER)
1885 return;
1886
1887 link_set_state(link, LINK_STATE_LINGER);
1888
1889 link_free_carrier_maps(link);
1890
1891 log_link_debug(link, "Link removed");
1892
1893 (void)unlink(link->state_file);
1894 link_unref(link);
1895
1896 return;
1897 }
1898
1899 static int link_joined(Link *link) {
1900 int r;
1901
1902 assert(link);
1903 assert(link->network);
1904
1905 if (!hashmap_isempty(link->bound_to_links)) {
1906 r = link_handle_bound_to_list(link);
1907 if (r < 0)
1908 return r;
1909 } else if (!(link->flags & IFF_UP)) {
1910 r = link_up(link);
1911 if (r < 0) {
1912 link_enter_failed(link);
1913 return r;
1914 }
1915 }
1916
1917 if (link->network->bridge) {
1918 r = link_set_bridge(link);
1919 if (r < 0)
1920 log_link_error_errno(link, r, "Could not set bridge message: %m");
1921 }
1922
1923 return link_enter_set_addresses(link);
1924 }
1925
1926 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1927 _cleanup_link_unref_ Link *link = userdata;
1928 int r;
1929
1930 assert(link);
1931 assert(link->network);
1932
1933 link->enslaving--;
1934
1935 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1936 return 1;
1937
1938 r = sd_netlink_message_get_errno(m);
1939 if (r < 0 && r != -EEXIST) {
1940 log_link_error_errno(link, r, "Could not join netdev: %m");
1941 link_enter_failed(link);
1942 return 1;
1943 } else
1944 log_link_debug(link, "Joined netdev");
1945
1946 if (link->enslaving <= 0)
1947 link_joined(link);
1948
1949 return 1;
1950 }
1951
1952 static int link_enter_join_netdev(Link *link) {
1953 NetDev *netdev;
1954 Iterator i;
1955 int r;
1956
1957 assert(link);
1958 assert(link->network);
1959 assert(link->state == LINK_STATE_PENDING);
1960
1961 link_set_state(link, LINK_STATE_ENSLAVING);
1962
1963 link_dirty(link);
1964
1965 if (!link->network->bridge &&
1966 !link->network->bond &&
1967 hashmap_isempty(link->network->stacked_netdevs))
1968 return link_joined(link);
1969
1970 if (link->network->bond) {
1971 log_struct(LOG_DEBUG,
1972 LOG_LINK_INTERFACE(link),
1973 LOG_NETDEV_INTERFACE(link->network->bond),
1974 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname),
1975 NULL);
1976
1977 r = netdev_join(link->network->bond, link, netdev_join_handler);
1978 if (r < 0) {
1979 log_struct_errno(LOG_WARNING, r,
1980 LOG_LINK_INTERFACE(link),
1981 LOG_NETDEV_INTERFACE(link->network->bond),
1982 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname),
1983 NULL);
1984
1985 link_enter_failed(link);
1986 return r;
1987 }
1988
1989 link->enslaving++;
1990 }
1991
1992 if (link->network->bridge) {
1993 log_struct(LOG_DEBUG,
1994 LOG_LINK_INTERFACE(link),
1995 LOG_NETDEV_INTERFACE(link->network->bridge),
1996 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname),
1997 NULL);
1998
1999 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2000 if (r < 0) {
2001 log_struct_errno(LOG_WARNING, r,
2002 LOG_LINK_INTERFACE(link),
2003 LOG_NETDEV_INTERFACE(link->network->bridge),
2004 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname),
2005 NULL),
2006 link_enter_failed(link);
2007 return r;
2008 }
2009
2010 link->enslaving++;
2011 }
2012
2013 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2014
2015 log_struct(LOG_DEBUG,
2016 LOG_LINK_INTERFACE(link),
2017 LOG_NETDEV_INTERFACE(netdev),
2018 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname),
2019 NULL);
2020
2021 r = netdev_join(netdev, link, netdev_join_handler);
2022 if (r < 0) {
2023 log_struct_errno(LOG_WARNING, r,
2024 LOG_LINK_INTERFACE(link),
2025 LOG_NETDEV_INTERFACE(netdev),
2026 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname),
2027 NULL);
2028 link_enter_failed(link);
2029 return r;
2030 }
2031
2032 link->enslaving++;
2033 }
2034
2035 return 0;
2036 }
2037
2038 static int link_set_ipv4_forward(Link *link) {
2039 int r;
2040
2041 if (!link_ipv4_forward_enabled(link))
2042 return 0;
2043
2044 /* We propagate the forwarding flag from one interface to the
2045 * global setting one way. This means: as long as at least one
2046 * interface was configured at any time that had IP forwarding
2047 * enabled the setting will stay on for good. We do this
2048 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2049 * somewhat in sync (see below). */
2050
2051 r = write_string_file("/proc/sys/net/ipv4/ip_forward", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2052 if (r < 0)
2053 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2054
2055 return 0;
2056 }
2057
2058 static int link_set_ipv6_forward(Link *link) {
2059 int r;
2060
2061 if (!link_ipv6_forward_enabled(link))
2062 return 0;
2063
2064 /* On Linux, the IPv6 stack does not not know a per-interface
2065 * packet forwarding setting: either packet forwarding is on
2066 * for all, or off for all. We hence don't bother with a
2067 * per-interface setting, but simply propagate the interface
2068 * flag, if it is set, to the global flag, one-way. Note that
2069 * while IPv4 would allow a per-interface flag, we expose the
2070 * same behaviour there and also propagate the setting from
2071 * one to all, to keep things simple (see above). */
2072
2073 r = write_string_file("/proc/sys/net/ipv6/conf/all/forwarding", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2074 if (r < 0)
2075 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2076
2077 return 0;
2078 }
2079
2080 static int link_set_ipv6_privacy_extensions(Link *link) {
2081 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2082 IPv6PrivacyExtensions s;
2083 const char *p = NULL;
2084 int r;
2085
2086 s = link_ipv6_privacy_extensions(link);
2087 if (s < 0)
2088 return 0;
2089
2090 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/use_tempaddr");
2091 xsprintf(buf, "%u", (unsigned) link->network->ipv6_privacy_extensions);
2092
2093 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2094 if (r < 0)
2095 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2096
2097 return 0;
2098 }
2099
2100 static int link_set_ipv6_accept_ra(Link *link) {
2101 const char *p = NULL;
2102 int r;
2103
2104 /* Make this a NOP if IPv6 is not available */
2105 if (!socket_ipv6_is_supported())
2106 return 0;
2107
2108 if (link->flags & IFF_LOOPBACK)
2109 return 0;
2110
2111 if (!link->network)
2112 return 0;
2113
2114 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/accept_ra");
2115
2116 /* We handle router advertisments ourselves, tell the kernel to GTFO */
2117 r = write_string_file(p, "0", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2118 if (r < 0)
2119 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2120
2121 return 0;
2122 }
2123
2124 static int link_set_ipv6_dad_transmits(Link *link) {
2125 char buf[DECIMAL_STR_MAX(int) + 1];
2126 const char *p = NULL;
2127 int r;
2128
2129 /* Make this a NOP if IPv6 is not available */
2130 if (!socket_ipv6_is_supported())
2131 return 0;
2132
2133 if (link->flags & IFF_LOOPBACK)
2134 return 0;
2135
2136 if (!link->network)
2137 return 0;
2138
2139 if (link->network->ipv6_dad_transmits < 0)
2140 return 0;
2141
2142 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/dad_transmits");
2143 xsprintf(buf, "%i", link->network->ipv6_dad_transmits);
2144
2145 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2146 if (r < 0)
2147 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2148
2149 return 0;
2150 }
2151
2152 static int link_set_ipv6_hop_limit(Link *link) {
2153 char buf[DECIMAL_STR_MAX(int) + 1];
2154 const char *p = NULL;
2155 int r;
2156
2157 /* Make this a NOP if IPv6 is not available */
2158 if (!socket_ipv6_is_supported())
2159 return 0;
2160
2161 if (link->flags & IFF_LOOPBACK)
2162 return 0;
2163
2164 if (!link->network)
2165 return 0;
2166
2167 if (link->network->ipv6_hop_limit < 0)
2168 return 0;
2169
2170 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/hop_limit");
2171 xsprintf(buf, "%i", link->network->ipv6_hop_limit);
2172
2173 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2174 if (r < 0)
2175 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2176
2177 return 0;
2178 }
2179
2180 static int link_drop_foreign_config(Link *link) {
2181 Address *address;
2182 Route *route;
2183 Iterator i;
2184 int r;
2185
2186 SET_FOREACH(address, link->addresses_foreign, i) {
2187 /* we consider IPv6LL addresses to be managed by the kernel */
2188 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2189 continue;
2190
2191 r = address_remove(address, link, link_address_remove_handler);
2192 if (r < 0)
2193 return r;
2194 }
2195
2196 SET_FOREACH(route, link->routes_foreign, i) {
2197 /* do not touch routes managed by the kernel */
2198 if (route->protocol == RTPROT_KERNEL)
2199 continue;
2200
2201 r = route_remove(route, link, link_address_remove_handler);
2202 if (r < 0)
2203 return r;
2204 }
2205
2206 return 0;
2207 }
2208
2209 static int link_update_lldp(Link *link) {
2210 int r;
2211
2212 assert(link);
2213
2214 if (!link->lldp)
2215 return 0;
2216
2217 if (link->flags & IFF_UP) {
2218 r = sd_lldp_start(link->lldp);
2219 if (r > 0)
2220 log_link_debug(link, "Started LLDP.");
2221 } else {
2222 r = sd_lldp_stop(link->lldp);
2223 if (r > 0)
2224 log_link_debug(link, "Stopped LLDP.");
2225 }
2226
2227 return r;
2228 }
2229
2230 static int link_configure(Link *link) {
2231 int r;
2232
2233 assert(link);
2234 assert(link->network);
2235 assert(link->state == LINK_STATE_PENDING);
2236
2237 /* Drop foreign config, but ignore loopback or critical devices.
2238 * We do not want to remove loopback address or addresses used for root NFS. */
2239 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2240 r = link_drop_foreign_config(link);
2241 if (r < 0)
2242 return r;
2243 }
2244
2245 r = link_set_bridge_fdb(link);
2246 if (r < 0)
2247 return r;
2248
2249 r = link_set_proxy_arp(link);
2250 if (r < 0)
2251 return r;
2252
2253 r = link_set_ipv4_forward(link);
2254 if (r < 0)
2255 return r;
2256
2257 r = link_set_ipv6_forward(link);
2258 if (r < 0)
2259 return r;
2260
2261 r = link_set_ipv6_privacy_extensions(link);
2262 if (r < 0)
2263 return r;
2264
2265 r = link_set_ipv6_accept_ra(link);
2266 if (r < 0)
2267 return r;
2268
2269 r = link_set_ipv6_dad_transmits(link);
2270 if (r < 0)
2271 return r;
2272
2273 r = link_set_ipv6_hop_limit(link);
2274 if (r < 0)
2275 return r;
2276
2277 if (link_ipv4ll_enabled(link)) {
2278 r = ipv4ll_configure(link);
2279 if (r < 0)
2280 return r;
2281 }
2282
2283 if (link_dhcp4_enabled(link)) {
2284 r = dhcp4_configure(link);
2285 if (r < 0)
2286 return r;
2287 }
2288
2289 if (link_dhcp4_server_enabled(link)) {
2290 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2291 if (r < 0)
2292 return r;
2293
2294 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2295 if (r < 0)
2296 return r;
2297 }
2298
2299 if (link_dhcp6_enabled(link) ||
2300 link_ipv6_accept_ra_enabled(link)) {
2301 r = dhcp6_configure(link);
2302 if (r < 0)
2303 return r;
2304 }
2305
2306 if (link_ipv6_accept_ra_enabled(link)) {
2307 r = ndisc_configure(link);
2308 if (r < 0)
2309 return r;
2310 }
2311
2312 if (link_lldp_rx_enabled(link)) {
2313 r = sd_lldp_new(&link->lldp, link->ifindex);
2314 if (r < 0)
2315 return r;
2316
2317 r = sd_lldp_match_capabilities(link->lldp,
2318 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
2319 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
2320 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
2321 if (r < 0)
2322 return r;
2323
2324 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
2325 if (r < 0)
2326 return r;
2327
2328 r = sd_lldp_attach_event(link->lldp, NULL, 0);
2329 if (r < 0)
2330 return r;
2331
2332 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
2333 if (r < 0)
2334 return r;
2335
2336 r = link_update_lldp(link);
2337 if (r < 0)
2338 return r;
2339 }
2340
2341 if (link_has_carrier(link)) {
2342 r = link_acquire_conf(link);
2343 if (r < 0)
2344 return r;
2345
2346 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) == 0) {
2347 r = link_acquire_ipv6_conf(link);
2348 if (r < 0)
2349 return r;
2350 }
2351 }
2352
2353 return link_enter_join_netdev(link);
2354 }
2355
2356 static int link_initialized_and_synced(sd_netlink *rtnl, sd_netlink_message *m,
2357 void *userdata) {
2358 _cleanup_link_unref_ Link *link = userdata;
2359 Network *network;
2360 int r;
2361
2362 assert(link);
2363 assert(link->ifname);
2364 assert(link->manager);
2365
2366 if (link->state != LINK_STATE_PENDING)
2367 return 1;
2368
2369 log_link_debug(link, "Link state is up-to-date");
2370
2371 r = link_new_bound_by_list(link);
2372 if (r < 0)
2373 return r;
2374
2375 r = link_handle_bound_by_list(link);
2376 if (r < 0)
2377 return r;
2378
2379 if (!link->network) {
2380 r = network_get(link->manager, link->udev_device, link->ifname,
2381 &link->mac, &network);
2382 if (r == -ENOENT) {
2383 link_enter_unmanaged(link);
2384 return 1;
2385 } else if (r < 0)
2386 return r;
2387
2388 if (link->flags & IFF_LOOPBACK) {
2389 if (network->link_local != ADDRESS_FAMILY_NO)
2390 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2391
2392 if (network->dhcp != ADDRESS_FAMILY_NO)
2393 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2394
2395 if (network->dhcp_server)
2396 log_link_debug(link, "Ignoring DHCP server for loopback link");
2397 }
2398
2399 r = network_apply(link->manager, network, link);
2400 if (r < 0)
2401 return r;
2402 }
2403
2404 r = link_new_bound_to_list(link);
2405 if (r < 0)
2406 return r;
2407
2408 r = link_configure(link);
2409 if (r < 0)
2410 return r;
2411
2412 return 1;
2413 }
2414
2415 int link_initialized(Link *link, struct udev_device *device) {
2416 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2417 int r;
2418
2419 assert(link);
2420 assert(link->manager);
2421 assert(link->manager->rtnl);
2422 assert(device);
2423
2424 if (link->state != LINK_STATE_PENDING)
2425 return 0;
2426
2427 if (link->udev_device)
2428 return 0;
2429
2430 log_link_debug(link, "udev initialized link");
2431
2432 link->udev_device = udev_device_ref(device);
2433
2434 /* udev has initialized the link, but we don't know if we have yet
2435 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2436 * when it returns we know that the pending NEWLINKs have already been
2437 * processed and that we are up-to-date */
2438
2439 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2440 link->ifindex);
2441 if (r < 0)
2442 return r;
2443
2444 r = sd_netlink_call_async(link->manager->rtnl, req,
2445 link_initialized_and_synced, link, 0, NULL);
2446 if (r < 0)
2447 return r;
2448
2449 link_ref(link);
2450
2451 return 0;
2452 }
2453
2454 static int link_load(Link *link) {
2455 _cleanup_free_ char *network_file = NULL,
2456 *addresses = NULL,
2457 *routes = NULL,
2458 *dhcp4_address = NULL,
2459 *ipv4ll_address = NULL;
2460 union in_addr_union address;
2461 union in_addr_union route_dst;
2462 const char *p;
2463 int r;
2464
2465 assert(link);
2466
2467 r = parse_env_file(link->state_file, NEWLINE,
2468 "NETWORK_FILE", &network_file,
2469 "ADDRESSES", &addresses,
2470 "ROUTES", &routes,
2471 "DHCP4_ADDRESS", &dhcp4_address,
2472 "IPV4LL_ADDRESS", &ipv4ll_address,
2473 NULL);
2474 if (r < 0 && r != -ENOENT)
2475 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
2476
2477 if (network_file) {
2478 Network *network;
2479 char *suffix;
2480
2481 /* drop suffix */
2482 suffix = strrchr(network_file, '.');
2483 if (!suffix) {
2484 log_link_debug(link, "Failed to get network name from %s", network_file);
2485 goto network_file_fail;
2486 }
2487 *suffix = '\0';
2488
2489 r = network_get_by_name(link->manager, basename(network_file), &network);
2490 if (r < 0) {
2491 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
2492 goto network_file_fail;
2493 }
2494
2495 r = network_apply(link->manager, network, link);
2496 if (r < 0)
2497 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
2498 }
2499
2500 network_file_fail:
2501
2502 if (addresses) {
2503 p = addresses;
2504
2505 for (;;) {
2506 _cleanup_free_ char *address_str = NULL;
2507 char *prefixlen_str;
2508 int family;
2509 unsigned char prefixlen;
2510
2511 r = extract_first_word(&p, &address_str, NULL, 0);
2512 if (r < 0) {
2513 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
2514 continue;
2515 }
2516 if (r == 0)
2517 break;
2518
2519 prefixlen_str = strchr(address_str, '/');
2520 if (!prefixlen_str) {
2521 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
2522 continue;
2523 }
2524
2525 *prefixlen_str++ = '\0';
2526
2527 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
2528 if (r != 1) {
2529 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
2530 continue;
2531 }
2532
2533 r = in_addr_from_string_auto(address_str, &family, &address);
2534 if (r < 0) {
2535 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
2536 continue;
2537 }
2538
2539 r = address_add(link, family, &address, prefixlen, NULL);
2540 if (r < 0)
2541 return log_link_error_errno(link, r, "Failed to add address: %m");
2542 }
2543 }
2544
2545 if (routes) {
2546 p = routes;
2547
2548 for (;;) {
2549 Route *route;
2550 _cleanup_free_ char *route_str = NULL;
2551 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
2552 usec_t lifetime;
2553 char *prefixlen_str;
2554 int family;
2555 unsigned char prefixlen, tos, table;
2556 uint32_t priority;
2557
2558 r = extract_first_word(&p, &route_str, NULL, 0);
2559 if (r < 0) {
2560 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
2561 continue;
2562 }
2563 if (r == 0)
2564 break;
2565
2566 prefixlen_str = strchr(route_str, '/');
2567 if (!prefixlen_str) {
2568 log_link_debug(link, "Failed to parse route %s", route_str);
2569 continue;
2570 }
2571
2572 *prefixlen_str++ = '\0';
2573
2574 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
2575 if (r != 5) {
2576 log_link_debug(link,
2577 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
2578 prefixlen_str);
2579 continue;
2580 }
2581
2582 r = in_addr_from_string_auto(route_str, &family, &route_dst);
2583 if (r < 0) {
2584 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
2585 continue;
2586 }
2587
2588 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
2589 if (r < 0)
2590 return log_link_error_errno(link, r, "Failed to add route: %m");
2591
2592 if (lifetime != USEC_INFINITY) {
2593 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
2594 0, route_expire_handler, route);
2595 if (r < 0)
2596 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
2597 }
2598
2599 route->lifetime = lifetime;
2600 sd_event_source_unref(route->expire);
2601 route->expire = expire;
2602 expire = NULL;
2603 }
2604 }
2605
2606 if (dhcp4_address) {
2607 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
2608 if (r < 0) {
2609 log_link_debug_errno(link, r, "Falied to parse DHCPv4 address %s: %m", dhcp4_address);
2610 goto dhcp4_address_fail;
2611 }
2612
2613 r = sd_dhcp_client_new(&link->dhcp_client);
2614 if (r < 0)
2615 return log_link_error_errno(link, r, "Falied to create DHCPv4 client: %m");
2616
2617 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
2618 if (r < 0)
2619 return log_link_error_errno(link, r, "Falied to set inital DHCPv4 address %s: %m", dhcp4_address);
2620 }
2621
2622 dhcp4_address_fail:
2623
2624 if (ipv4ll_address) {
2625 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
2626 if (r < 0) {
2627 log_link_debug_errno(link, r, "Falied to parse IPv4LL address %s: %m", ipv4ll_address);
2628 goto ipv4ll_address_fail;
2629 }
2630
2631 r = sd_ipv4ll_new(&link->ipv4ll);
2632 if (r < 0)
2633 return log_link_error_errno(link, r, "Falied to create IPv4LL client: %m");
2634
2635 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
2636 if (r < 0)
2637 return log_link_error_errno(link, r, "Falied to set inital IPv4LL address %s: %m", ipv4ll_address);
2638 }
2639
2640 ipv4ll_address_fail:
2641
2642 return 0;
2643 }
2644
2645 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
2646 Link *link;
2647 _cleanup_udev_device_unref_ struct udev_device *device = NULL;
2648 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
2649 int r;
2650
2651 assert(m);
2652 assert(m->rtnl);
2653 assert(message);
2654 assert(ret);
2655
2656 r = link_new(m, message, ret);
2657 if (r < 0)
2658 return r;
2659
2660 link = *ret;
2661
2662 log_link_debug(link, "Link %d added", link->ifindex);
2663
2664 r = link_load(link);
2665 if (r < 0)
2666 return r;
2667
2668 if (detect_container() <= 0) {
2669 /* not in a container, udev will be around */
2670 sprintf(ifindex_str, "n%d", link->ifindex);
2671 device = udev_device_new_from_device_id(m->udev, ifindex_str);
2672 if (!device) {
2673 r = log_link_warning_errno(link, errno, "Could not find udev device: %m");
2674 goto failed;
2675 }
2676
2677 if (udev_device_get_is_initialized(device) <= 0) {
2678 /* not yet ready */
2679 log_link_debug(link, "link pending udev initialization...");
2680 return 0;
2681 }
2682
2683 r = link_initialized(link, device);
2684 if (r < 0)
2685 goto failed;
2686 } else {
2687 /* we are calling a callback directly, so must take a ref */
2688 link_ref(link);
2689
2690 r = link_initialized_and_synced(m->rtnl, NULL, link);
2691 if (r < 0)
2692 goto failed;
2693 }
2694
2695 return 0;
2696 failed:
2697 link_enter_failed(link);
2698 return r;
2699 }
2700
2701 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
2702 int r;
2703
2704 assert(link);
2705
2706 log_link_info(link, "Gained IPv6LL");
2707
2708 link->ipv6ll_address = *address;
2709 link_check_ready(link);
2710
2711 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
2712 r = link_acquire_ipv6_conf(link);
2713 if (r < 0) {
2714 link_enter_failed(link);
2715 return r;
2716 }
2717 }
2718
2719 return 0;
2720 }
2721
2722 static int link_carrier_gained(Link *link) {
2723 int r;
2724
2725 assert(link);
2726
2727 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
2728 r = link_acquire_conf(link);
2729 if (r < 0) {
2730 link_enter_failed(link);
2731 return r;
2732 }
2733 }
2734
2735 r = link_handle_bound_by_list(link);
2736 if (r < 0)
2737 return r;
2738
2739 return 0;
2740 }
2741
2742 static int link_carrier_lost(Link *link) {
2743 int r;
2744
2745 assert(link);
2746
2747 r = link_stop_clients(link);
2748 if (r < 0) {
2749 link_enter_failed(link);
2750 return r;
2751 }
2752
2753 r = link_handle_bound_by_list(link);
2754 if (r < 0)
2755 return r;
2756
2757 return 0;
2758 }
2759
2760 int link_carrier_reset(Link *link) {
2761 int r;
2762
2763 assert(link);
2764
2765 if (link_has_carrier(link)) {
2766 r = link_carrier_lost(link);
2767 if (r < 0)
2768 return r;
2769
2770 r = link_carrier_gained(link);
2771 if (r < 0)
2772 return r;
2773
2774 log_link_info(link, "Reset carrier");
2775 }
2776
2777 return 0;
2778 }
2779
2780 int link_update(Link *link, sd_netlink_message *m) {
2781 struct ether_addr mac;
2782 const char *ifname;
2783 uint32_t mtu;
2784 bool had_carrier, carrier_gained, carrier_lost;
2785 int r;
2786
2787 assert(link);
2788 assert(link->ifname);
2789 assert(m);
2790
2791 if (link->state == LINK_STATE_LINGER) {
2792 link_ref(link);
2793 log_link_info(link, "Link readded");
2794 link_set_state(link, LINK_STATE_ENSLAVING);
2795
2796 r = link_new_carrier_maps(link);
2797 if (r < 0)
2798 return r;
2799 }
2800
2801 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
2802 if (r >= 0 && !streq(ifname, link->ifname)) {
2803 log_link_info(link, "Renamed to %s", ifname);
2804
2805 link_free_carrier_maps(link);
2806
2807 r = free_and_strdup(&link->ifname, ifname);
2808 if (r < 0)
2809 return r;
2810
2811 r = link_new_carrier_maps(link);
2812 if (r < 0)
2813 return r;
2814 }
2815
2816 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
2817 if (r >= 0 && mtu > 0) {
2818 link->mtu = mtu;
2819 if (!link->original_mtu) {
2820 link->original_mtu = mtu;
2821 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
2822 }
2823
2824 if (link->dhcp_client) {
2825 r = sd_dhcp_client_set_mtu(link->dhcp_client,
2826 link->mtu);
2827 if (r < 0) {
2828 log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
2829 return r;
2830 }
2831 }
2832 }
2833
2834 /* The kernel may broadcast NEWLINK messages without the MAC address
2835 set, simply ignore them. */
2836 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
2837 if (r >= 0) {
2838 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
2839 ETH_ALEN)) {
2840
2841 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
2842 ETH_ALEN);
2843
2844 log_link_debug(link, "MAC address: "
2845 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
2846 mac.ether_addr_octet[0],
2847 mac.ether_addr_octet[1],
2848 mac.ether_addr_octet[2],
2849 mac.ether_addr_octet[3],
2850 mac.ether_addr_octet[4],
2851 mac.ether_addr_octet[5]);
2852
2853 if (link->ipv4ll) {
2854 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
2855 if (r < 0)
2856 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
2857 }
2858
2859 if (link->dhcp_client) {
2860 r = sd_dhcp_client_set_mac(link->dhcp_client,
2861 (const uint8_t *) &link->mac,
2862 sizeof (link->mac),
2863 ARPHRD_ETHER);
2864 if (r < 0)
2865 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
2866
2867 if (link->network->duid_type != _DUID_TYPE_INVALID)
2868 r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
2869 link->network->iaid,
2870 link->network->dhcp_duid_type,
2871 link->network->dhcp_duid,
2872 link->network->dhcp_duid_len);
2873 else
2874 r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
2875 link->network->iaid,
2876 link->manager->dhcp_duid_type,
2877 link->manager->dhcp_duid,
2878 link->manager->dhcp_duid_len);
2879 if (r < 0)
2880 return log_link_warning_errno(link, r, "Could not update DUID/IAID in DHCP client: %m");
2881 }
2882
2883 if (link->dhcp6_client) {
2884 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
2885 (const uint8_t *) &link->mac,
2886 sizeof (link->mac),
2887 ARPHRD_ETHER);
2888 if (r < 0)
2889 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
2890
2891 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
2892 link->network->iaid);
2893 if (r < 0)
2894 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
2895
2896 if (link->network->duid_type != _DUID_TYPE_INVALID)
2897 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
2898 link->network->dhcp_duid_type,
2899 link->network->dhcp_duid,
2900 link->network->dhcp_duid_len);
2901 else
2902 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
2903 link->manager->dhcp_duid_type,
2904 link->manager->dhcp_duid,
2905 link->manager->dhcp_duid_len);
2906 if (r < 0)
2907 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
2908 }
2909 }
2910 }
2911
2912 had_carrier = link_has_carrier(link);
2913
2914 r = link_update_flags(link, m);
2915 if (r < 0)
2916 return r;
2917
2918 r = link_update_lldp(link);
2919 if (r < 0)
2920 return r;
2921
2922 carrier_gained = !had_carrier && link_has_carrier(link);
2923 carrier_lost = had_carrier && !link_has_carrier(link);
2924
2925 if (carrier_gained) {
2926 log_link_info(link, "Gained carrier");
2927
2928 r = link_carrier_gained(link);
2929 if (r < 0)
2930 return r;
2931 } else if (carrier_lost) {
2932 log_link_info(link, "Lost carrier");
2933
2934 r = link_carrier_lost(link);
2935 if (r < 0)
2936 return r;
2937 }
2938
2939 return 0;
2940 }
2941
2942 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
2943 bool space = false;
2944 Iterator i;
2945 Link *link;
2946
2947 assert(f);
2948 assert(prefix);
2949
2950 if (hashmap_isempty(h))
2951 return;
2952
2953 fputs(prefix, f);
2954 HASHMAP_FOREACH(link, h, i) {
2955 if (space)
2956 fputc(' ', f);
2957
2958 fprintf(f, "%i", link->ifindex);
2959 space = true;
2960 }
2961
2962 fputc('\n', f);
2963 }
2964
2965 int link_save(Link *link) {
2966 _cleanup_free_ char *temp_path = NULL;
2967 _cleanup_fclose_ FILE *f = NULL;
2968 const char *admin_state, *oper_state;
2969 Address *a;
2970 Route *route;
2971 Iterator i;
2972 int r;
2973
2974 assert(link);
2975 assert(link->state_file);
2976 assert(link->lease_file);
2977 assert(link->manager);
2978
2979 if (link->state == LINK_STATE_LINGER) {
2980 unlink(link->state_file);
2981 return 0;
2982 }
2983
2984 link_lldp_save(link);
2985
2986 admin_state = link_state_to_string(link->state);
2987 assert(admin_state);
2988
2989 oper_state = link_operstate_to_string(link->operstate);
2990 assert(oper_state);
2991
2992 r = fopen_temporary(link->state_file, &f, &temp_path);
2993 if (r < 0)
2994 goto fail;
2995
2996 fchmod(fileno(f), 0644);
2997
2998 fprintf(f,
2999 "# This is private data. Do not parse.\n"
3000 "ADMIN_STATE=%s\n"
3001 "OPER_STATE=%s\n",
3002 admin_state, oper_state);
3003
3004 if (link->network) {
3005 bool space;
3006 sd_dhcp6_lease *dhcp6_lease = NULL;
3007 const char *dhcp_domainname = NULL;
3008 char **dhcp6_domains = NULL;
3009
3010 if (link->dhcp6_client) {
3011 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3012 if (r < 0 && r != -ENOMSG)
3013 log_link_debug(link, "No DHCPv6 lease");
3014 }
3015
3016 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3017
3018 fputs("DNS=", f);
3019 space = false;
3020 fputstrv(f, link->network->dns, NULL, &space);
3021
3022 if (link->network->dhcp_use_dns &&
3023 link->dhcp_lease) {
3024 const struct in_addr *addresses;
3025
3026 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3027 if (r > 0) {
3028 if (space)
3029 fputc(' ', f);
3030 serialize_in_addrs(f, addresses, r);
3031 space = true;
3032 }
3033 }
3034
3035 if (link->network->dhcp_use_dns && dhcp6_lease) {
3036 struct in6_addr *in6_addrs;
3037
3038 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3039 if (r > 0) {
3040 if (space)
3041 fputc(' ', f);
3042 serialize_in6_addrs(f, in6_addrs, r);
3043 }
3044 }
3045
3046 fputc('\n', f);
3047
3048 fputs("NTP=", f);
3049 space = false;
3050 fputstrv(f, link->network->ntp, NULL, &space);
3051
3052 if (link->network->dhcp_use_ntp &&
3053 link->dhcp_lease) {
3054 const struct in_addr *addresses;
3055
3056 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3057 if (r > 0) {
3058 if (space)
3059 fputc(' ', f);
3060 serialize_in_addrs(f, addresses, r);
3061 space = true;
3062 }
3063 }
3064
3065 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3066 struct in6_addr *in6_addrs;
3067 char **hosts;
3068
3069 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3070 &in6_addrs);
3071 if (r > 0) {
3072 if (space)
3073 fputc(' ', f);
3074 serialize_in6_addrs(f, in6_addrs, r);
3075 space = true;
3076 }
3077
3078 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3079 if (r > 0)
3080 fputstrv(f, hosts, NULL, &space);
3081 }
3082
3083 fputc('\n', f);
3084
3085 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3086 if (link->dhcp_lease)
3087 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3088
3089 if (dhcp6_lease)
3090 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3091 }
3092
3093 fputs("DOMAINS=", f);
3094 fputstrv(f, link->network->search_domains, NULL, &space);
3095
3096 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES && dhcp_domainname)
3097 fputs_with_space(f, dhcp_domainname, NULL, &space);
3098
3099 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES && dhcp6_domains)
3100 fputstrv(f, dhcp6_domains, NULL, &space);
3101
3102 fputc('\n', f);
3103
3104 fputs("ROUTE_DOMAINS=", f);
3105 fputstrv(f, link->network->route_domains, NULL, NULL);
3106
3107 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE && dhcp_domainname)
3108 fputs_with_space(f, dhcp_domainname, NULL, &space);
3109
3110 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE && dhcp6_domains)
3111 fputstrv(f, dhcp6_domains, NULL, &space);
3112
3113 fputc('\n', f);
3114
3115 fprintf(f, "LLMNR=%s\n",
3116 resolve_support_to_string(link->network->llmnr));
3117 fprintf(f, "MDNS=%s\n",
3118 resolve_support_to_string(link->network->mdns));
3119
3120 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3121 fprintf(f, "DNSSEC=%s\n",
3122 dnssec_mode_to_string(link->network->dnssec_mode));
3123
3124 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3125 const char *n;
3126
3127 fputs("DNSSEC_NTA=", f);
3128 space = false;
3129 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3130 fputs_with_space(f, n, NULL, &space);
3131 fputc('\n', f);
3132 }
3133
3134 fputs("ADDRESSES=", f);
3135 space = false;
3136 SET_FOREACH(a, link->addresses, i) {
3137 _cleanup_free_ char *address_str = NULL;
3138
3139 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3140 if (r < 0)
3141 goto fail;
3142
3143 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3144 space = true;
3145 }
3146 fputc('\n', f);
3147
3148 fputs("ROUTES=", f);
3149 space = false;
3150 SET_FOREACH(route, link->routes, i) {
3151 _cleanup_free_ char *route_str = NULL;
3152
3153 r = in_addr_to_string(route->family, &route->dst, &route_str);
3154 if (r < 0)
3155 goto fail;
3156
3157 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%hhu/"USEC_FMT, space ? " " : "", route_str,
3158 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3159 space = true;
3160 }
3161
3162 fputc('\n', f);
3163 }
3164
3165 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3166 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3167
3168 if (link->dhcp_lease) {
3169 struct in_addr address;
3170 const char *tz = NULL;
3171
3172 assert(link->network);
3173
3174 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3175 if (r >= 0)
3176 fprintf(f, "TIMEZONE=%s\n", tz);
3177
3178 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3179 if (r >= 0) {
3180 fputs("DHCP4_ADDRESS=", f);
3181 serialize_in_addrs(f, &address, 1);
3182 fputc('\n', f);
3183 }
3184
3185 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3186 if (r < 0)
3187 goto fail;
3188
3189 fprintf(f,
3190 "DHCP_LEASE=%s\n",
3191 link->lease_file);
3192 } else
3193 unlink(link->lease_file);
3194
3195 if (link->ipv4ll) {
3196 struct in_addr address;
3197
3198 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3199 if (r >= 0) {
3200 fputs("IPV4LL_ADDRESS=", f);
3201 serialize_in_addrs(f, &address, 1);
3202 fputc('\n', f);
3203 }
3204 }
3205
3206 r = fflush_and_check(f);
3207 if (r < 0)
3208 goto fail;
3209
3210 if (rename(temp_path, link->state_file) < 0) {
3211 r = -errno;
3212 goto fail;
3213 }
3214
3215 return 0;
3216
3217 fail:
3218 (void) unlink(link->state_file);
3219 if (temp_path)
3220 (void) unlink(temp_path);
3221
3222 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3223 }
3224
3225 /* The serialized state in /run is no longer up-to-date. */
3226 void link_dirty(Link *link) {
3227 int r;
3228
3229 assert(link);
3230
3231 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3232 if (r < 0)
3233 /* allocation errors are ignored */
3234 return;
3235
3236 r = set_put(link->manager->dirty_links, link);
3237 if (r < 0)
3238 /* allocation errors are ignored */
3239 return;
3240
3241 link_ref(link);
3242 }
3243
3244 /* The serialized state in /run is up-to-date */
3245 void link_clean(Link *link) {
3246 assert(link);
3247 assert(link->manager);
3248
3249 set_remove(link->manager->dirty_links, link);
3250 link_unref(link);
3251 }
3252
3253 static const char* const link_state_table[_LINK_STATE_MAX] = {
3254 [LINK_STATE_PENDING] = "pending",
3255 [LINK_STATE_ENSLAVING] = "configuring",
3256 [LINK_STATE_SETTING_ADDRESSES] = "configuring",
3257 [LINK_STATE_SETTING_ROUTES] = "configuring",
3258 [LINK_STATE_CONFIGURED] = "configured",
3259 [LINK_STATE_UNMANAGED] = "unmanaged",
3260 [LINK_STATE_FAILED] = "failed",
3261 [LINK_STATE_LINGER] = "linger",
3262 };
3263
3264 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
3265
3266 static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
3267 [LINK_OPERSTATE_OFF] = "off",
3268 [LINK_OPERSTATE_NO_CARRIER] = "no-carrier",
3269 [LINK_OPERSTATE_DORMANT] = "dormant",
3270 [LINK_OPERSTATE_CARRIER] = "carrier",
3271 [LINK_OPERSTATE_DEGRADED] = "degraded",
3272 [LINK_OPERSTATE_ROUTABLE] = "routable",
3273 };
3274
3275 DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
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