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