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