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networkd-link: parse linkinfo to get kind
[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-lldp-tx.h"
32 #include "networkd-ndisc.h"
33 #include "networkd.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 (!socket_ipv6_is_supported())
46 return false;
47
48 if (link->flags & IFF_LOOPBACK)
49 return false;
50
51 if (!link->network)
52 return false;
53
54 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
55 }
56
57 static bool link_dhcp4_enabled(Link *link) {
58 assert(link);
59
60 if (link->flags & IFF_LOOPBACK)
61 return false;
62
63 if (!link->network)
64 return false;
65
66 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
67 }
68
69 static bool link_dhcp4_server_enabled(Link *link) {
70 assert(link);
71
72 if (link->flags & IFF_LOOPBACK)
73 return false;
74
75 if (!link->network)
76 return false;
77
78 return link->network->dhcp_server;
79 }
80
81 static bool link_ipv4ll_enabled(Link *link) {
82 assert(link);
83
84 if (link->flags & IFF_LOOPBACK)
85 return false;
86
87 if (!link->network)
88 return false;
89
90 return link->network->link_local & ADDRESS_FAMILY_IPV4;
91 }
92
93 static bool link_ipv6ll_enabled(Link *link) {
94 assert(link);
95
96 if (!socket_ipv6_is_supported())
97 return false;
98
99 if (link->flags & IFF_LOOPBACK)
100 return false;
101
102 if (!link->network)
103 return false;
104
105 return link->network->link_local & ADDRESS_FAMILY_IPV6;
106 }
107
108 static bool link_ipv6_enabled(Link *link) {
109 assert(link);
110
111 if (!socket_ipv6_is_supported())
112 return false;
113
114 if (link->network->bridge)
115 return false;
116
117 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
118 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
119 }
120
121 static bool link_lldp_rx_enabled(Link *link) {
122 assert(link);
123
124 if (link->flags & IFF_LOOPBACK)
125 return false;
126
127 if (link->iftype != ARPHRD_ETHER)
128 return false;
129
130 if (!link->network)
131 return false;
132
133 if (link->network->bridge)
134 return false;
135
136 return link->network->lldp_mode != LLDP_MODE_NO;
137 }
138
139 static bool link_lldp_emit_enabled(Link *link) {
140 assert(link);
141
142 if (link->flags & IFF_LOOPBACK)
143 return false;
144
145 if (link->iftype != ARPHRD_ETHER)
146 return false;
147
148 if (!link->network)
149 return false;
150
151 return link->network->lldp_emit != LLDP_EMIT_NO;
152 }
153
154 static bool link_ipv4_forward_enabled(Link *link) {
155 assert(link);
156
157 if (link->flags & IFF_LOOPBACK)
158 return false;
159
160 if (!link->network)
161 return false;
162
163 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
164 return false;
165
166 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
167 }
168
169 static bool link_ipv6_forward_enabled(Link *link) {
170 assert(link);
171
172 if (!socket_ipv6_is_supported())
173 return false;
174
175 if (link->flags & IFF_LOOPBACK)
176 return false;
177
178 if (!link->network)
179 return false;
180
181 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
182 return false;
183
184 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
185 }
186
187 static bool link_proxy_arp_enabled(Link *link) {
188 assert(link);
189
190 if (link->flags & IFF_LOOPBACK)
191 return false;
192
193 if (!link->network)
194 return false;
195
196 if (link->network->proxy_arp < 0)
197 return false;
198
199 return true;
200 }
201
202 static bool link_ipv6_accept_ra_enabled(Link *link) {
203 assert(link);
204
205 if (!socket_ipv6_is_supported())
206 return false;
207
208 if (link->flags & IFF_LOOPBACK)
209 return false;
210
211 if (!link->network)
212 return false;
213
214 /* If unset use system default (enabled if local forwarding is disabled.
215 * disabled if local forwarding is enabled).
216 * If set, ignore or enforce RA independent of local forwarding state.
217 */
218 if (link->network->ipv6_accept_ra < 0)
219 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
220 return !link_ipv6_forward_enabled(link);
221 else if (link->network->ipv6_accept_ra > 0)
222 /* accept RA even if ip_forward is enabled */
223 return true;
224 else
225 /* ignore RA */
226 return false;
227 }
228
229 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
230 assert(link);
231
232 if (!socket_ipv6_is_supported())
233 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
234
235 if (link->flags & IFF_LOOPBACK)
236 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
237
238 if (!link->network)
239 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
240
241 return link->network->ipv6_privacy_extensions;
242 }
243
244 static int link_enable_ipv6(Link *link) {
245 const char *p = NULL;
246 bool disabled;
247 int r;
248
249 if (link->flags & IFF_LOOPBACK)
250 return 0;
251
252 disabled = !link_ipv6_enabled(link);
253
254 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/disable_ipv6");
255
256 r = write_string_file(p, one_zero(disabled), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
257 if (r < 0)
258 log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m", disabled ? "disable" : "enable", link->ifname);
259 else {
260 if (disabled)
261 log_link_info(link, "IPv6 disabled for interface: %m");
262 else
263 log_link_info(link, "IPv6 enabled for interface: %m");
264 }
265
266 return 0;
267 }
268
269 void link_update_operstate(Link *link) {
270 LinkOperationalState operstate;
271 assert(link);
272
273 if (link->kernel_operstate == IF_OPER_DORMANT)
274 operstate = LINK_OPERSTATE_DORMANT;
275 else if (link_has_carrier(link)) {
276 Address *address;
277 uint8_t scope = RT_SCOPE_NOWHERE;
278 Iterator i;
279
280 /* if we have carrier, check what addresses we have */
281 SET_FOREACH(address, link->addresses, i) {
282 if (!address_is_ready(address))
283 continue;
284
285 if (address->scope < scope)
286 scope = address->scope;
287 }
288
289 /* for operstate we also take foreign addresses into account */
290 SET_FOREACH(address, link->addresses_foreign, i) {
291 if (!address_is_ready(address))
292 continue;
293
294 if (address->scope < scope)
295 scope = address->scope;
296 }
297
298 if (scope < RT_SCOPE_SITE)
299 /* universally accessible addresses found */
300 operstate = LINK_OPERSTATE_ROUTABLE;
301 else if (scope < RT_SCOPE_HOST)
302 /* only link or site local addresses found */
303 operstate = LINK_OPERSTATE_DEGRADED;
304 else
305 /* no useful addresses found */
306 operstate = LINK_OPERSTATE_CARRIER;
307 } else if (link->flags & IFF_UP)
308 operstate = LINK_OPERSTATE_NO_CARRIER;
309 else
310 operstate = LINK_OPERSTATE_OFF;
311
312 if (link->operstate != operstate) {
313 link->operstate = operstate;
314 link_send_changed(link, "OperationalState", NULL);
315 link_dirty(link);
316 }
317 }
318
319 #define FLAG_STRING(string, flag, old, new) \
320 (((old ^ new) & flag) \
321 ? ((old & flag) ? (" -" string) : (" +" string)) \
322 : "")
323
324 static int link_update_flags(Link *link, sd_netlink_message *m) {
325 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
326 uint8_t operstate;
327 int r;
328
329 assert(link);
330
331 r = sd_rtnl_message_link_get_flags(m, &flags);
332 if (r < 0)
333 return log_link_warning_errno(link, r, "Could not get link flags: %m");
334
335 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
336 if (r < 0)
337 /* if we got a message without operstate, take it to mean
338 the state was unchanged */
339 operstate = link->kernel_operstate;
340
341 if ((link->flags == flags) && (link->kernel_operstate == operstate))
342 return 0;
343
344 if (link->flags != flags) {
345 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",
346 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
347 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
348 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
349 FLAG_STRING("UP", IFF_UP, link->flags, flags),
350 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
351 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
352 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
353 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
354 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
355 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
356 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
357 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
358 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
359 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
360 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
361 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
362 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
363 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
364 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
365
366 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
367 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
368 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
369 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
370 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
371 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
372 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
373 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
374
375 /* link flags are currently at most 18 bits, let's align to
376 * printing 20 */
377 if (unknown_flags_added)
378 log_link_debug(link,
379 "Unknown link flags gained: %#.5x (ignoring)",
380 unknown_flags_added);
381
382 if (unknown_flags_removed)
383 log_link_debug(link,
384 "Unknown link flags lost: %#.5x (ignoring)",
385 unknown_flags_removed);
386 }
387
388 link->flags = flags;
389 link->kernel_operstate = operstate;
390
391 link_update_operstate(link);
392
393 return 0;
394 }
395
396 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
397 _cleanup_link_unref_ Link *link = NULL;
398 uint16_t type;
399 const char *ifname, *kind = NULL;
400 int r, ifindex;
401 unsigned short iftype;
402
403 assert(manager);
404 assert(message);
405 assert(ret);
406
407 /* check for link kind */
408 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
409 if (r == 0) {
410 (void)sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
411 r = sd_netlink_message_exit_container(message);
412 if (r < 0)
413 return r;
414 }
415
416 r = sd_netlink_message_get_type(message, &type);
417 if (r < 0)
418 return r;
419 else if (type != RTM_NEWLINK)
420 return -EINVAL;
421
422 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
423 if (r < 0)
424 return r;
425 else if (ifindex <= 0)
426 return -EINVAL;
427
428 r = sd_rtnl_message_link_get_type(message, &iftype);
429 if (r < 0)
430 return r;
431
432 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
433 if (r < 0)
434 return r;
435
436 link = new0(Link, 1);
437 if (!link)
438 return -ENOMEM;
439
440 link->n_ref = 1;
441 link->manager = manager;
442 link->state = LINK_STATE_PENDING;
443 link->rtnl_extended_attrs = true;
444 link->ifindex = ifindex;
445 link->iftype = iftype;
446 link->ifname = strdup(ifname);
447 if (!link->ifname)
448 return -ENOMEM;
449
450 if (kind) {
451 link->kind = strdup(kind);
452 if (!link->kind)
453 return -ENOMEM;
454 }
455
456 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
457 if (r < 0)
458 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
459
460 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
461 return -ENOMEM;
462
463 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
464 return -ENOMEM;
465
466 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
467 return -ENOMEM;
468
469 r = hashmap_ensure_allocated(&manager->links, NULL);
470 if (r < 0)
471 return r;
472
473 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
474 if (r < 0)
475 return r;
476
477 r = link_update_flags(link, message);
478 if (r < 0)
479 return r;
480
481 *ret = link;
482 link = NULL;
483
484 return 0;
485 }
486
487 static void link_free(Link *link) {
488 Address *address;
489 Iterator i;
490 Link *carrier;
491
492 if (!link)
493 return;
494
495 while (!set_isempty(link->addresses))
496 address_free(set_first(link->addresses));
497
498 while (!set_isempty(link->addresses_foreign))
499 address_free(set_first(link->addresses_foreign));
500
501 link->addresses = set_free(link->addresses);
502
503 link->addresses_foreign = set_free(link->addresses_foreign);
504
505 while ((address = link->pool_addresses)) {
506 LIST_REMOVE(addresses, link->pool_addresses, address);
507 address_free(address);
508 }
509
510 sd_dhcp_server_unref(link->dhcp_server);
511 sd_dhcp_client_unref(link->dhcp_client);
512 sd_dhcp_lease_unref(link->dhcp_lease);
513
514 link_lldp_emit_stop(link);
515
516 free(link->lease_file);
517
518 sd_lldp_unref(link->lldp);
519 free(link->lldp_file);
520
521 sd_ipv4ll_unref(link->ipv4ll);
522 sd_dhcp6_client_unref(link->dhcp6_client);
523 sd_ndisc_unref(link->ndisc);
524
525 set_free_free(link->ndisc_rdnss);
526 set_free_free(link->ndisc_dnssl);
527
528 if (link->manager)
529 hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex));
530
531 free(link->ifname);
532
533 if (link->kind)
534 free(link->kind);
535
536 (void)unlink(link->state_file);
537 free(link->state_file);
538
539 udev_device_unref(link->udev_device);
540
541 HASHMAP_FOREACH (carrier, link->bound_to_links, i)
542 hashmap_remove(link->bound_to_links, INT_TO_PTR(carrier->ifindex));
543 hashmap_free(link->bound_to_links);
544
545 HASHMAP_FOREACH (carrier, link->bound_by_links, i)
546 hashmap_remove(link->bound_by_links, INT_TO_PTR(carrier->ifindex));
547 hashmap_free(link->bound_by_links);
548
549 free(link);
550 }
551
552 Link *link_unref(Link *link) {
553 if (!link)
554 return NULL;
555
556 assert(link->n_ref > 0);
557
558 link->n_ref--;
559
560 if (link->n_ref > 0)
561 return NULL;
562
563 link_free(link);
564
565 return NULL;
566 }
567
568 Link *link_ref(Link *link) {
569 if (!link)
570 return NULL;
571
572 assert(link->n_ref > 0);
573
574 link->n_ref++;
575
576 return link;
577 }
578
579 int link_get(Manager *m, int ifindex, Link **ret) {
580 Link *link;
581
582 assert(m);
583 assert(ifindex);
584 assert(ret);
585
586 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
587 if (!link)
588 return -ENODEV;
589
590 *ret = link;
591
592 return 0;
593 }
594
595 static void link_set_state(Link *link, LinkState state) {
596 assert(link);
597
598 if (link->state == state)
599 return;
600
601 link->state = state;
602
603 link_send_changed(link, "AdministrativeState", NULL);
604 }
605
606 static void link_enter_unmanaged(Link *link) {
607 assert(link);
608
609 log_link_debug(link, "Unmanaged");
610
611 link_set_state(link, LINK_STATE_UNMANAGED);
612
613 link_dirty(link);
614 }
615
616 static int link_stop_clients(Link *link) {
617 int r = 0, k;
618
619 assert(link);
620 assert(link->manager);
621 assert(link->manager->event);
622
623 if (link->dhcp_client) {
624 k = sd_dhcp_client_stop(link->dhcp_client);
625 if (k < 0)
626 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
627 }
628
629 if (link->ipv4ll) {
630 k = sd_ipv4ll_stop(link->ipv4ll);
631 if (k < 0)
632 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
633 }
634
635 if (link->dhcp6_client) {
636 k = sd_dhcp6_client_stop(link->dhcp6_client);
637 if (k < 0)
638 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
639 }
640
641 if (link->ndisc) {
642 k = sd_ndisc_stop(link->ndisc);
643 if (k < 0)
644 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
645 }
646
647 link_lldp_emit_stop(link);
648 return r;
649 }
650
651 void link_enter_failed(Link *link) {
652 assert(link);
653
654 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
655 return;
656
657 log_link_warning(link, "Failed");
658
659 link_set_state(link, LINK_STATE_FAILED);
660
661 link_stop_clients(link);
662
663 link_dirty(link);
664 }
665
666 static Address* link_find_dhcp_server_address(Link *link) {
667 Address *address;
668
669 assert(link);
670 assert(link->network);
671
672 /* The first statically configured address if there is any */
673 LIST_FOREACH(addresses, address, link->network->static_addresses) {
674
675 if (address->family != AF_INET)
676 continue;
677
678 if (in_addr_is_null(address->family, &address->in_addr))
679 continue;
680
681 return address;
682 }
683
684 /* If that didn't work, find a suitable address we got from the pool */
685 LIST_FOREACH(addresses, address, link->pool_addresses) {
686 if (address->family != AF_INET)
687 continue;
688
689 return address;
690 }
691
692 return NULL;
693 }
694
695 static int link_enter_configured(Link *link) {
696 assert(link);
697 assert(link->network);
698 assert(link->state == LINK_STATE_SETTING_ROUTES);
699
700 log_link_info(link, "Configured");
701
702 link_set_state(link, LINK_STATE_CONFIGURED);
703
704 link_dirty(link);
705
706 return 0;
707 }
708
709 void link_check_ready(Link *link) {
710 Address *a;
711 Iterator i;
712
713 assert(link);
714
715 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
716 return;
717
718 if (!link->network)
719 return;
720
721 if (!link->static_configured)
722 return;
723
724 if (link_ipv4ll_enabled(link))
725 if (!link->ipv4ll_address ||
726 !link->ipv4ll_route)
727 return;
728
729 if (link_ipv6ll_enabled(link))
730 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) > 0)
731 return;
732
733 if ((link_dhcp4_enabled(link) && !link_dhcp6_enabled(link) &&
734 !link->dhcp4_configured) ||
735 (link_dhcp6_enabled(link) && !link_dhcp4_enabled(link) &&
736 !link->dhcp6_configured) ||
737 (link_dhcp4_enabled(link) && link_dhcp6_enabled(link) &&
738 !link->dhcp4_configured && !link->dhcp6_configured))
739 return;
740
741 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
742 return;
743
744 SET_FOREACH(a, link->addresses, i)
745 if (!address_is_ready(a))
746 return;
747
748 if (link->state != LINK_STATE_CONFIGURED)
749 link_enter_configured(link);
750
751 return;
752 }
753
754 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
755 _cleanup_link_unref_ Link *link = userdata;
756 int r;
757
758 assert(link->link_messages > 0);
759 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
760 LINK_STATE_SETTING_ROUTES, LINK_STATE_FAILED,
761 LINK_STATE_LINGER));
762
763 link->link_messages--;
764
765 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
766 return 1;
767
768 r = sd_netlink_message_get_errno(m);
769 if (r < 0 && r != -EEXIST)
770 log_link_warning_errno(link, r, "Could not set route: %m");
771
772 if (link->link_messages == 0) {
773 log_link_debug(link, "Routes set");
774 link->static_configured = true;
775 link_check_ready(link);
776 }
777
778 return 1;
779 }
780
781 static int link_enter_set_routes(Link *link) {
782 Route *rt;
783 int r;
784
785 assert(link);
786 assert(link->network);
787 assert(link->state == LINK_STATE_SETTING_ADDRESSES);
788
789 link_set_state(link, LINK_STATE_SETTING_ROUTES);
790
791 LIST_FOREACH(routes, rt, link->network->static_routes) {
792 r = route_configure(rt, link, route_handler);
793 if (r < 0) {
794 log_link_warning_errno(link, r, "Could not set routes: %m");
795 link_enter_failed(link);
796 return r;
797 }
798
799 link->link_messages++;
800 }
801
802 if (link->link_messages == 0) {
803 link->static_configured = true;
804 link_check_ready(link);
805 } else
806 log_link_debug(link, "Setting routes");
807
808 return 0;
809 }
810
811 int link_route_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
812 _cleanup_link_unref_ Link *link = userdata;
813 int r;
814
815 assert(m);
816 assert(link);
817 assert(link->ifname);
818
819 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
820 return 1;
821
822 r = sd_netlink_message_get_errno(m);
823 if (r < 0 && r != -ESRCH)
824 log_link_warning_errno(link, r, "Could not drop route: %m");
825
826 return 1;
827 }
828
829 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
830 _cleanup_link_unref_ Link *link = userdata;
831 int r;
832
833 assert(rtnl);
834 assert(m);
835 assert(link);
836 assert(link->ifname);
837 assert(link->link_messages > 0);
838 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
839 LINK_STATE_FAILED, LINK_STATE_LINGER));
840
841 link->link_messages--;
842
843 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
844 return 1;
845
846 r = sd_netlink_message_get_errno(m);
847 if (r < 0 && r != -EEXIST)
848 log_link_warning_errno(link, r, "could not set address: %m");
849 else if (r >= 0)
850 manager_rtnl_process_address(rtnl, m, link->manager);
851
852 if (link->link_messages == 0) {
853 log_link_debug(link, "Addresses set");
854 link_enter_set_routes(link);
855 }
856
857 return 1;
858 }
859
860 static int link_push_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
861 _cleanup_free_ struct in_addr *addresses = NULL;
862 size_t n_addresses = 0, n_allocated = 0;
863 char **a;
864
865 log_debug("Copying DNS server information from %s", link->ifname);
866
867 if (!link->network)
868 return 0;
869
870 STRV_FOREACH(a, link->network->dns) {
871 struct in_addr ia;
872
873 /* Only look for IPv4 addresses */
874 if (inet_pton(AF_INET, *a, &ia) <= 0)
875 continue;
876
877 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
878 return log_oom();
879
880 addresses[n_addresses++] = ia;
881 }
882
883 if (link->network->dhcp_use_dns &&
884 link->dhcp_lease) {
885 const struct in_addr *da = NULL;
886 int n;
887
888 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
889 if (n > 0) {
890
891 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
892 return log_oom();
893
894 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
895 n_addresses += n;
896 }
897 }
898
899 if (n_addresses <= 0)
900 return 0;
901
902 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
903 }
904
905 static int link_push_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
906 _cleanup_free_ struct in_addr *addresses = NULL;
907 size_t n_addresses = 0, n_allocated = 0;
908 char **a;
909
910 if (!link->network)
911 return 0;
912
913 log_debug("Copying NTP server information from %s", link->ifname);
914
915 STRV_FOREACH(a, link->network->ntp) {
916 struct in_addr ia;
917
918 /* Only look for IPv4 addresses */
919 if (inet_pton(AF_INET, *a, &ia) <= 0)
920 continue;
921
922 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
923 return log_oom();
924
925 addresses[n_addresses++] = ia;
926 }
927
928 if (link->network->dhcp_use_ntp &&
929 link->dhcp_lease) {
930 const struct in_addr *da = NULL;
931 int n;
932
933 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
934 if (n > 0) {
935
936 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
937 return log_oom();
938
939 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
940 n_addresses += n;
941 }
942 }
943
944 if (n_addresses <= 0)
945 return 0;
946
947 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
948 }
949
950 static int link_enter_set_addresses(Link *link) {
951 Address *ad;
952 int r;
953
954 assert(link);
955 assert(link->network);
956 assert(link->state != _LINK_STATE_INVALID);
957
958 link_set_state(link, LINK_STATE_SETTING_ADDRESSES);
959
960 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
961 r = address_configure(ad, link, address_handler, false);
962 if (r < 0) {
963 log_link_warning_errno(link, r, "Could not set addresses: %m");
964 link_enter_failed(link);
965 return r;
966 }
967
968 link->link_messages++;
969 }
970
971 /* now that we can figure out a default address for the dhcp server,
972 start it */
973 if (link_dhcp4_server_enabled(link)) {
974 Address *address;
975 Link *uplink = NULL;
976 bool acquired_uplink = false;
977
978 address = link_find_dhcp_server_address(link);
979 if (!address) {
980 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
981 link_enter_failed(link);
982 return 0;
983 }
984
985 /* use the server address' subnet as the pool */
986 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
987 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
988 if (r < 0)
989 return r;
990
991 /* TODO:
992 r = sd_dhcp_server_set_router(link->dhcp_server,
993 &main_address->in_addr.in);
994 if (r < 0)
995 return r;
996 */
997
998 if (link->network->dhcp_server_max_lease_time_usec > 0) {
999 r = sd_dhcp_server_set_max_lease_time(
1000 link->dhcp_server,
1001 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1002 if (r < 0)
1003 return r;
1004 }
1005
1006 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1007 r = sd_dhcp_server_set_default_lease_time(
1008 link->dhcp_server,
1009 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1010 if (r < 0)
1011 return r;
1012 }
1013
1014 if (link->network->dhcp_server_emit_dns) {
1015
1016 if (link->network->n_dhcp_server_dns > 0)
1017 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1018 else {
1019 uplink = manager_find_uplink(link->manager, link);
1020 acquired_uplink = true;
1021
1022 if (!uplink) {
1023 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1024 r = 0;
1025 } else
1026 r = link_push_dns_to_dhcp_server(uplink, link->dhcp_server);
1027 }
1028 if (r < 0)
1029 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1030 }
1031
1032
1033 if (link->network->dhcp_server_emit_ntp) {
1034
1035 if (link->network->n_dhcp_server_ntp > 0)
1036 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1037 else {
1038 if (!acquired_uplink)
1039 uplink = manager_find_uplink(link->manager, link);
1040
1041 if (!uplink) {
1042 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1043 r = 0;
1044 } else
1045 r = link_push_ntp_to_dhcp_server(uplink, link->dhcp_server);
1046
1047 }
1048 if (r < 0)
1049 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1050 }
1051
1052 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1053 if (r < 0) {
1054 log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1055 return r;
1056 }
1057
1058 if (link->network->dhcp_server_emit_timezone) {
1059 _cleanup_free_ char *buffer = NULL;
1060 const char *tz = NULL;
1061
1062 if (link->network->dhcp_server_timezone)
1063 tz = link->network->dhcp_server_timezone;
1064 else {
1065 r = get_timezone(&buffer);
1066 if (r < 0)
1067 log_warning_errno(r, "Failed to determine timezone: %m");
1068 else
1069 tz = buffer;
1070 }
1071
1072 if (tz) {
1073 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1074 if (r < 0)
1075 return r;
1076 }
1077 }
1078
1079 r = sd_dhcp_server_start(link->dhcp_server);
1080 if (r < 0) {
1081 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1082
1083 link_enter_failed(link);
1084
1085 return 0;
1086 }
1087
1088 log_link_debug(link, "Offering DHCPv4 leases");
1089 }
1090
1091 if (link->link_messages == 0)
1092 link_enter_set_routes(link);
1093 else
1094 log_link_debug(link, "Setting addresses");
1095
1096 return 0;
1097 }
1098
1099 int link_address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1100 _cleanup_link_unref_ Link *link = userdata;
1101 int r;
1102
1103 assert(m);
1104 assert(link);
1105 assert(link->ifname);
1106
1107 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1108 return 1;
1109
1110 r = sd_netlink_message_get_errno(m);
1111 if (r < 0 && r != -EADDRNOTAVAIL)
1112 log_link_warning_errno(link, r, "Could not drop address: %m");
1113
1114 return 1;
1115 }
1116
1117 static int link_set_bridge_fdb(Link *link) {
1118 FdbEntry *fdb_entry;
1119 int r = 0;
1120
1121 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1122 r = fdb_entry_configure(link, fdb_entry);
1123 if (r < 0) {
1124 log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1125 break;
1126 }
1127 }
1128
1129 return r;
1130 }
1131
1132 static int link_set_proxy_arp(Link *link) {
1133 const char *p = NULL;
1134 int r;
1135
1136 if (!link_proxy_arp_enabled(link))
1137 return 0;
1138
1139 p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/proxy_arp");
1140
1141 r = write_string_file(p, one_zero(link->network->proxy_arp), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
1142 if (r < 0)
1143 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1144
1145 return 0;
1146 }
1147
1148 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1149 _cleanup_link_unref_ Link *link = userdata;
1150 int r;
1151
1152 log_link_debug(link, "Set link");
1153
1154 r = sd_netlink_message_get_errno(m);
1155 if (r < 0 && r != -EEXIST) {
1156 log_link_error_errno(link, r, "Could not join netdev: %m");
1157 link_enter_failed(link);
1158 return 1;
1159 }
1160
1161 return 0;
1162 }
1163
1164 static int set_hostname_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
1165 _cleanup_link_unref_ Link *link = userdata;
1166 const sd_bus_error *e;
1167
1168 assert(m);
1169 assert(link);
1170
1171 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1172 return 1;
1173
1174 e = sd_bus_message_get_error(m);
1175 if (e)
1176 log_link_warning_errno(link, sd_bus_error_get_errno(e), "Could not set hostname: %s", e->message);
1177
1178 return 1;
1179 }
1180
1181 int link_set_hostname(Link *link, const char *hostname) {
1182 int r;
1183
1184 assert(link);
1185 assert(link->manager);
1186
1187 log_link_debug(link, "Setting transient hostname: '%s'", strna(hostname));
1188
1189 if (!link->manager->bus) {
1190 /* TODO: replace by assert when we can rely on kdbus */
1191 log_link_info(link, "Not connected to system bus, ignoring transient hostname.");
1192 return 0;
1193 }
1194
1195 r = sd_bus_call_method_async(
1196 link->manager->bus,
1197 NULL,
1198 "org.freedesktop.hostname1",
1199 "/org/freedesktop/hostname1",
1200 "org.freedesktop.hostname1",
1201 "SetHostname",
1202 set_hostname_handler,
1203 link,
1204 "sb",
1205 hostname,
1206 false);
1207
1208 if (r < 0)
1209 return log_link_error_errno(link, r, "Could not set transient hostname: %m");
1210
1211 link_ref(link);
1212
1213 return 0;
1214 }
1215
1216 static int set_timezone_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
1217 _cleanup_link_unref_ Link *link = userdata;
1218 const sd_bus_error *e;
1219
1220 assert(m);
1221 assert(link);
1222
1223 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1224 return 1;
1225
1226 e = sd_bus_message_get_error(m);
1227 if (e)
1228 log_link_warning_errno(link, sd_bus_error_get_errno(e), "Could not set timezone: %s", e->message);
1229
1230 return 1;
1231 }
1232
1233 int link_set_timezone(Link *link, const char *tz) {
1234 int r;
1235
1236 assert(link);
1237 assert(link->manager);
1238 assert(tz);
1239
1240 log_link_debug(link, "Setting system timezone: '%s'", tz);
1241
1242 if (!link->manager->bus) {
1243 log_link_info(link, "Not connected to system bus, ignoring timezone.");
1244 return 0;
1245 }
1246
1247 r = sd_bus_call_method_async(
1248 link->manager->bus,
1249 NULL,
1250 "org.freedesktop.timedate1",
1251 "/org/freedesktop/timedate1",
1252 "org.freedesktop.timedate1",
1253 "SetTimezone",
1254 set_timezone_handler,
1255 link,
1256 "sb",
1257 tz,
1258 false);
1259 if (r < 0)
1260 return log_link_error_errno(link, r, "Could not set timezone: %m");
1261
1262 link_ref(link);
1263
1264 return 0;
1265 }
1266
1267 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1268 _cleanup_link_unref_ Link *link = userdata;
1269 int r;
1270
1271 assert(m);
1272 assert(link);
1273 assert(link->ifname);
1274
1275 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1276 return 1;
1277
1278 r = sd_netlink_message_get_errno(m);
1279 if (r < 0)
1280 log_link_warning_errno(link, r, "Could not set MTU: %m");
1281
1282 return 1;
1283 }
1284
1285 int link_set_mtu(Link *link, uint32_t mtu) {
1286 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1287 int r;
1288
1289 assert(link);
1290 assert(link->manager);
1291 assert(link->manager->rtnl);
1292
1293 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1294
1295 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1296 if (r < 0)
1297 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1298
1299 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1300 if (r < 0)
1301 return log_link_error_errno(link, r, "Could not append MTU: %m");
1302
1303 r = sd_netlink_call_async(link->manager->rtnl, req, set_mtu_handler, link, 0, NULL);
1304 if (r < 0)
1305 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1306
1307 link_ref(link);
1308
1309 return 0;
1310 }
1311
1312 static int link_set_bridge(Link *link) {
1313 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1314 int r;
1315
1316 assert(link);
1317 assert(link->network);
1318
1319 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1320 if (r < 0)
1321 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1322
1323 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1324 if (r < 0)
1325 return log_link_error_errno(link, r, "Could not set message family: %m");
1326
1327 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1328 if (r < 0)
1329 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1330
1331 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, !link->network->use_bpdu);
1332 if (r < 0)
1333 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1334
1335 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1336 if (r < 0)
1337 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1338
1339 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1340 if (r < 0)
1341 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1342
1343 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, !link->network->allow_port_to_be_root);
1344 if (r < 0)
1345 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1346
1347 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1348 if (r < 0)
1349 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1350
1351 if (link->network->cost != 0) {
1352 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1353 if (r < 0)
1354 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1355 }
1356
1357 r = sd_netlink_message_close_container(req);
1358 if (r < 0)
1359 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1360
1361 r = sd_netlink_call_async(link->manager->rtnl, req, link_set_handler, link, 0, NULL);
1362 if (r < 0)
1363 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1364
1365 link_ref(link);
1366
1367 return r;
1368 }
1369
1370 static int link_lldp_save(Link *link) {
1371 _cleanup_free_ char *temp_path = NULL;
1372 _cleanup_fclose_ FILE *f = NULL;
1373 sd_lldp_neighbor **l = NULL;
1374 int n = 0, r, i;
1375
1376 assert(link);
1377 assert(link->lldp_file);
1378
1379 if (!link->lldp) {
1380 (void) unlink(link->lldp_file);
1381 return 0;
1382 }
1383
1384 r = sd_lldp_get_neighbors(link->lldp, &l);
1385 if (r < 0)
1386 goto finish;
1387 if (r == 0) {
1388 (void) unlink(link->lldp_file);
1389 goto finish;
1390 }
1391
1392 n = r;
1393
1394 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1395 if (r < 0)
1396 goto finish;
1397
1398 fchmod(fileno(f), 0644);
1399
1400 for (i = 0; i < n; i++) {
1401 const void *p;
1402 le64_t u;
1403 size_t sz;
1404
1405 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1406 if (r < 0)
1407 goto finish;
1408
1409 u = htole64(sz);
1410 (void) fwrite(&u, 1, sizeof(u), f);
1411 (void) fwrite(p, 1, sz, f);
1412 }
1413
1414 r = fflush_and_check(f);
1415 if (r < 0)
1416 goto finish;
1417
1418 if (rename(temp_path, link->lldp_file) < 0) {
1419 r = -errno;
1420 goto finish;
1421 }
1422
1423 finish:
1424 if (r < 0) {
1425 (void) unlink(link->lldp_file);
1426 if (temp_path)
1427 (void) unlink(temp_path);
1428
1429 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1430 }
1431
1432 if (l) {
1433 for (i = 0; i < n; i++)
1434 sd_lldp_neighbor_unref(l[i]);
1435 free(l);
1436 }
1437
1438 return r;
1439 }
1440
1441 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1442 Link *link = userdata;
1443 int r;
1444
1445 assert(link);
1446
1447 (void) link_lldp_save(link);
1448
1449 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1450 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1451
1452 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1453
1454 r = link_lldp_emit_start(link);
1455 if (r < 0)
1456 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1457 }
1458 }
1459
1460 static int link_acquire_ipv6_conf(Link *link) {
1461 int r;
1462
1463 assert(link);
1464
1465 if (link_dhcp6_enabled(link)) {
1466 assert(link->dhcp6_client);
1467 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1468
1469 /* start DHCPv6 client in stateless mode */
1470 r = dhcp6_request_address(link, true);
1471 if (r < 0 && r != -EBUSY)
1472 return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m");
1473 else
1474 log_link_debug(link, "Acquiring DHCPv6 lease");
1475 }
1476
1477 if (link_ipv6_accept_ra_enabled(link)) {
1478 assert(link->ndisc);
1479
1480 log_link_debug(link, "Discovering IPv6 routers");
1481
1482 r = sd_ndisc_start(link->ndisc);
1483 if (r < 0 && r != -EBUSY)
1484 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1485 }
1486
1487 return 0;
1488 }
1489
1490 static int link_acquire_ipv4_conf(Link *link) {
1491 int r;
1492
1493 assert(link);
1494 assert(link->network);
1495 assert(link->manager);
1496 assert(link->manager->event);
1497
1498 if (link_ipv4ll_enabled(link)) {
1499 assert(link->ipv4ll);
1500
1501 log_link_debug(link, "Acquiring IPv4 link-local address");
1502
1503 r = sd_ipv4ll_start(link->ipv4ll);
1504 if (r < 0)
1505 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1506 }
1507
1508 if (link_dhcp4_enabled(link)) {
1509 assert(link->dhcp_client);
1510
1511 log_link_debug(link, "Acquiring DHCPv4 lease");
1512
1513 r = sd_dhcp_client_start(link->dhcp_client);
1514 if (r < 0)
1515 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1516 }
1517
1518 return 0;
1519 }
1520
1521 static int link_acquire_conf(Link *link) {
1522 int r;
1523
1524 assert(link);
1525
1526 r = link_acquire_ipv4_conf(link);
1527 if (r < 0)
1528 return r;
1529
1530 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) == 0) {
1531 r = link_acquire_ipv6_conf(link);
1532 if (r < 0)
1533 return r;
1534 }
1535
1536 if (link_lldp_emit_enabled(link)) {
1537 r = link_lldp_emit_start(link);
1538 if (r < 0)
1539 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1540 }
1541
1542 return 0;
1543 }
1544
1545 bool link_has_carrier(Link *link) {
1546 /* see Documentation/networking/operstates.txt in the kernel sources */
1547
1548 if (link->kernel_operstate == IF_OPER_UP)
1549 return true;
1550
1551 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1552 /* operstate may not be implemented, so fall back to flags */
1553 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1554 return true;
1555
1556 return false;
1557 }
1558
1559 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1560 _cleanup_link_unref_ Link *link = userdata;
1561 int r;
1562
1563 assert(link);
1564
1565 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1566 return 1;
1567
1568 r = sd_netlink_message_get_errno(m);
1569 if (r < 0)
1570 /* we warn but don't fail the link, as it may be
1571 brought up later */
1572 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1573
1574 return 1;
1575 }
1576
1577 static int link_up(Link *link) {
1578 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1579 uint8_t ipv6ll_mode;
1580 int r;
1581
1582 assert(link);
1583 assert(link->network);
1584 assert(link->manager);
1585 assert(link->manager->rtnl);
1586
1587 log_link_debug(link, "Bringing link up");
1588
1589 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1590 if (r < 0)
1591 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1592
1593 /* set it free if not enslaved with networkd */
1594 if (!link->network->bridge && !link->network->bond) {
1595 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1596 if (r < 0)
1597 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1598 }
1599
1600 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1601 if (r < 0)
1602 return log_link_error_errno(link, r, "Could not set link flags: %m");
1603
1604 if (link->network->mac) {
1605 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1606 if (r < 0)
1607 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1608 }
1609
1610 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1611 for this interface, or if it is a bridge slave, then disable IPv6 else enable it. */
1612 (void) link_enable_ipv6(link);
1613
1614 if (link->network->mtu) {
1615 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1616 on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1617 if (link_ipv6_enabled(link) && link->network->mtu < IPV6_MIN_MTU) {
1618
1619 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1620 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1621
1622 link->network->mtu = IPV6_MIN_MTU;
1623 }
1624
1625 r = sd_netlink_message_append_u32(req, IFLA_MTU, link->network->mtu);
1626 if (r < 0)
1627 return log_link_error_errno(link, r, "Could not set MTU: %m");
1628 }
1629
1630 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1631 if (r < 0)
1632 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1633
1634 if (link_ipv6_enabled(link)) {
1635 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
1636 r = sd_netlink_message_open_container(req, AF_INET6);
1637 if (r < 0)
1638 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1639
1640 if (!link_ipv6ll_enabled(link))
1641 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1642 else {
1643 const char *p = NULL;
1644 _cleanup_free_ char *stable_secret = NULL;
1645
1646 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/stable_secret");
1647 r = read_one_line_file(p, &stable_secret);
1648
1649 if (r < 0)
1650 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1651 else
1652 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1653 }
1654 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1655 if (r < 0)
1656 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1657
1658 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
1659 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
1660 if (r < 0)
1661 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
1662 }
1663
1664 r = sd_netlink_message_close_container(req);
1665 if (r < 0)
1666 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1667 }
1668
1669 r = sd_netlink_message_close_container(req);
1670 if (r < 0)
1671 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1672
1673 r = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
1674 if (r < 0)
1675 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1676
1677 link_ref(link);
1678
1679 return 0;
1680 }
1681
1682 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1683 _cleanup_link_unref_ Link *link = userdata;
1684 int r;
1685
1686 assert(link);
1687
1688 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1689 return 1;
1690
1691 r = sd_netlink_message_get_errno(m);
1692 if (r < 0)
1693 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1694
1695 return 1;
1696 }
1697
1698 static int link_down(Link *link) {
1699 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1700 int r;
1701
1702 assert(link);
1703 assert(link->manager);
1704 assert(link->manager->rtnl);
1705
1706 log_link_debug(link, "Bringing link down");
1707
1708 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1709 RTM_SETLINK, link->ifindex);
1710 if (r < 0)
1711 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1712
1713 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1714 if (r < 0)
1715 return log_link_error_errno(link, r, "Could not set link flags: %m");
1716
1717 r = sd_netlink_call_async(link->manager->rtnl, req, link_down_handler, link, 0, NULL);
1718 if (r < 0)
1719 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1720
1721 link_ref(link);
1722
1723 return 0;
1724 }
1725
1726 static int link_handle_bound_to_list(Link *link) {
1727 Link *l;
1728 Iterator i;
1729 int r;
1730 bool required_up = false;
1731 bool link_is_up = false;
1732
1733 assert(link);
1734
1735 if (hashmap_isempty(link->bound_to_links))
1736 return 0;
1737
1738 if (link->flags & IFF_UP)
1739 link_is_up = true;
1740
1741 HASHMAP_FOREACH (l, link->bound_to_links, i)
1742 if (link_has_carrier(l)) {
1743 required_up = true;
1744 break;
1745 }
1746
1747 if (!required_up && link_is_up) {
1748 r = link_down(link);
1749 if (r < 0)
1750 return r;
1751 } else if (required_up && !link_is_up) {
1752 r = link_up(link);
1753 if (r < 0)
1754 return r;
1755 }
1756
1757 return 0;
1758 }
1759
1760 static int link_handle_bound_by_list(Link *link) {
1761 Iterator i;
1762 Link *l;
1763 int r;
1764
1765 assert(link);
1766
1767 if (hashmap_isempty(link->bound_by_links))
1768 return 0;
1769
1770 HASHMAP_FOREACH (l, link->bound_by_links, i) {
1771 r = link_handle_bound_to_list(l);
1772 if (r < 0)
1773 return r;
1774 }
1775
1776 return 0;
1777 }
1778
1779 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1780 int r;
1781
1782 assert(link);
1783 assert(carrier);
1784
1785 if (link == carrier)
1786 return 0;
1787
1788 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1789 return 0;
1790
1791 r = hashmap_ensure_allocated(h, NULL);
1792 if (r < 0)
1793 return r;
1794
1795 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1796 if (r < 0)
1797 return r;
1798
1799 return 0;
1800 }
1801
1802 static int link_new_bound_by_list(Link *link) {
1803 Manager *m;
1804 Link *carrier;
1805 Iterator i;
1806 int r;
1807 bool list_updated = false;
1808
1809 assert(link);
1810 assert(link->manager);
1811
1812 m = link->manager;
1813
1814 HASHMAP_FOREACH(carrier, m->links, i) {
1815 if (!carrier->network)
1816 continue;
1817
1818 if (strv_isempty(carrier->network->bind_carrier))
1819 continue;
1820
1821 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
1822 r = link_put_carrier(link, carrier, &link->bound_by_links);
1823 if (r < 0)
1824 return r;
1825
1826 list_updated = true;
1827 }
1828 }
1829
1830 if (list_updated)
1831 link_dirty(link);
1832
1833 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
1834 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1835 if (r < 0)
1836 return r;
1837
1838 link_dirty(carrier);
1839 }
1840
1841 return 0;
1842 }
1843
1844 static int link_new_bound_to_list(Link *link) {
1845 Manager *m;
1846 Link *carrier;
1847 Iterator i;
1848 int r;
1849 bool list_updated = false;
1850
1851 assert(link);
1852 assert(link->manager);
1853
1854 if (!link->network)
1855 return 0;
1856
1857 if (strv_isempty(link->network->bind_carrier))
1858 return 0;
1859
1860 m = link->manager;
1861
1862 HASHMAP_FOREACH (carrier, m->links, i) {
1863 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
1864 r = link_put_carrier(link, carrier, &link->bound_to_links);
1865 if (r < 0)
1866 return r;
1867
1868 list_updated = true;
1869 }
1870 }
1871
1872 if (list_updated)
1873 link_dirty(link);
1874
1875 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
1876 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
1877 if (r < 0)
1878 return r;
1879
1880 link_dirty(carrier);
1881 }
1882
1883 return 0;
1884 }
1885
1886 static int link_new_carrier_maps(Link *link) {
1887 int r;
1888
1889 r = link_new_bound_by_list(link);
1890 if (r < 0)
1891 return r;
1892
1893 r = link_handle_bound_by_list(link);
1894 if (r < 0)
1895 return r;
1896
1897 r = link_new_bound_to_list(link);
1898 if (r < 0)
1899 return r;
1900
1901 r = link_handle_bound_to_list(link);
1902 if (r < 0)
1903 return r;
1904
1905 return 0;
1906 }
1907
1908 static void link_free_bound_to_list(Link *link) {
1909 Link *bound_to;
1910 Iterator i;
1911
1912 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
1913 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
1914
1915 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
1916 link_dirty(bound_to);
1917 }
1918
1919 return;
1920 }
1921
1922 static void link_free_bound_by_list(Link *link) {
1923 Link *bound_by;
1924 Iterator i;
1925
1926 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
1927 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
1928
1929 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
1930 link_dirty(bound_by);
1931 link_handle_bound_to_list(bound_by);
1932 }
1933 }
1934
1935 return;
1936 }
1937
1938 static void link_free_carrier_maps(Link *link) {
1939 bool list_updated = false;
1940
1941 assert(link);
1942
1943 if (!hashmap_isempty(link->bound_to_links)) {
1944 link_free_bound_to_list(link);
1945 list_updated = true;
1946 }
1947
1948 if (!hashmap_isempty(link->bound_by_links)) {
1949 link_free_bound_by_list(link);
1950 list_updated = true;
1951 }
1952
1953 if (list_updated)
1954 link_dirty(link);
1955
1956 return;
1957 }
1958
1959 void link_drop(Link *link) {
1960 if (!link || link->state == LINK_STATE_LINGER)
1961 return;
1962
1963 link_set_state(link, LINK_STATE_LINGER);
1964
1965 link_free_carrier_maps(link);
1966
1967 log_link_debug(link, "Link removed");
1968
1969 (void)unlink(link->state_file);
1970 link_unref(link);
1971
1972 return;
1973 }
1974
1975 static int link_joined(Link *link) {
1976 int r;
1977
1978 assert(link);
1979 assert(link->network);
1980
1981 if (!hashmap_isempty(link->bound_to_links)) {
1982 r = link_handle_bound_to_list(link);
1983 if (r < 0)
1984 return r;
1985 } else if (!(link->flags & IFF_UP)) {
1986 r = link_up(link);
1987 if (r < 0) {
1988 link_enter_failed(link);
1989 return r;
1990 }
1991 }
1992
1993 if (link->network->bridge) {
1994 r = link_set_bridge(link);
1995 if (r < 0)
1996 log_link_error_errno(link, r, "Could not set bridge message: %m");
1997 }
1998
1999 return link_enter_set_addresses(link);
2000 }
2001
2002 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
2003 _cleanup_link_unref_ Link *link = userdata;
2004 int r;
2005
2006 assert(link);
2007 assert(link->network);
2008
2009 link->enslaving--;
2010
2011 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2012 return 1;
2013
2014 r = sd_netlink_message_get_errno(m);
2015 if (r < 0 && r != -EEXIST) {
2016 log_link_error_errno(link, r, "Could not join netdev: %m");
2017 link_enter_failed(link);
2018 return 1;
2019 } else
2020 log_link_debug(link, "Joined netdev");
2021
2022 if (link->enslaving <= 0)
2023 link_joined(link);
2024
2025 return 1;
2026 }
2027
2028 static int link_enter_join_netdev(Link *link) {
2029 NetDev *netdev;
2030 Iterator i;
2031 int r;
2032
2033 assert(link);
2034 assert(link->network);
2035 assert(link->state == LINK_STATE_PENDING);
2036
2037 link_set_state(link, LINK_STATE_ENSLAVING);
2038
2039 link_dirty(link);
2040
2041 if (!link->network->bridge &&
2042 !link->network->bond &&
2043 hashmap_isempty(link->network->stacked_netdevs))
2044 return link_joined(link);
2045
2046 if (link->network->bond) {
2047 log_struct(LOG_DEBUG,
2048 LOG_LINK_INTERFACE(link),
2049 LOG_NETDEV_INTERFACE(link->network->bond),
2050 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname),
2051 NULL);
2052
2053 r = netdev_join(link->network->bond, link, netdev_join_handler);
2054 if (r < 0) {
2055 log_struct_errno(LOG_WARNING, r,
2056 LOG_LINK_INTERFACE(link),
2057 LOG_NETDEV_INTERFACE(link->network->bond),
2058 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname),
2059 NULL);
2060
2061 link_enter_failed(link);
2062 return r;
2063 }
2064
2065 link->enslaving++;
2066 }
2067
2068 if (link->network->bridge) {
2069 log_struct(LOG_DEBUG,
2070 LOG_LINK_INTERFACE(link),
2071 LOG_NETDEV_INTERFACE(link->network->bridge),
2072 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname),
2073 NULL);
2074
2075 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2076 if (r < 0) {
2077 log_struct_errno(LOG_WARNING, r,
2078 LOG_LINK_INTERFACE(link),
2079 LOG_NETDEV_INTERFACE(link->network->bridge),
2080 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname),
2081 NULL),
2082 link_enter_failed(link);
2083 return r;
2084 }
2085
2086 link->enslaving++;
2087 }
2088
2089 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2090
2091 log_struct(LOG_DEBUG,
2092 LOG_LINK_INTERFACE(link),
2093 LOG_NETDEV_INTERFACE(netdev),
2094 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname),
2095 NULL);
2096
2097 r = netdev_join(netdev, link, netdev_join_handler);
2098 if (r < 0) {
2099 log_struct_errno(LOG_WARNING, r,
2100 LOG_LINK_INTERFACE(link),
2101 LOG_NETDEV_INTERFACE(netdev),
2102 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname),
2103 NULL);
2104 link_enter_failed(link);
2105 return r;
2106 }
2107
2108 link->enslaving++;
2109 }
2110
2111 return 0;
2112 }
2113
2114 static int link_set_ipv4_forward(Link *link) {
2115 int r;
2116
2117 if (!link_ipv4_forward_enabled(link))
2118 return 0;
2119
2120 /* We propagate the forwarding flag from one interface to the
2121 * global setting one way. This means: as long as at least one
2122 * interface was configured at any time that had IP forwarding
2123 * enabled the setting will stay on for good. We do this
2124 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2125 * somewhat in sync (see below). */
2126
2127 r = write_string_file("/proc/sys/net/ipv4/ip_forward", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2128 if (r < 0)
2129 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2130
2131 return 0;
2132 }
2133
2134 static int link_set_ipv6_forward(Link *link) {
2135 int r;
2136
2137 if (!link_ipv6_forward_enabled(link))
2138 return 0;
2139
2140 /* On Linux, the IPv6 stack does not not know a per-interface
2141 * packet forwarding setting: either packet forwarding is on
2142 * for all, or off for all. We hence don't bother with a
2143 * per-interface setting, but simply propagate the interface
2144 * flag, if it is set, to the global flag, one-way. Note that
2145 * while IPv4 would allow a per-interface flag, we expose the
2146 * same behaviour there and also propagate the setting from
2147 * one to all, to keep things simple (see above). */
2148
2149 r = write_string_file("/proc/sys/net/ipv6/conf/all/forwarding", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2150 if (r < 0)
2151 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2152
2153 return 0;
2154 }
2155
2156 static int link_set_ipv6_privacy_extensions(Link *link) {
2157 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2158 IPv6PrivacyExtensions s;
2159 const char *p = NULL;
2160 int r;
2161
2162 s = link_ipv6_privacy_extensions(link);
2163 if (s < 0)
2164 return 0;
2165
2166 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/use_tempaddr");
2167 xsprintf(buf, "%u", (unsigned) link->network->ipv6_privacy_extensions);
2168
2169 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2170 if (r < 0)
2171 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2172
2173 return 0;
2174 }
2175
2176 static int link_set_ipv6_accept_ra(Link *link) {
2177 const char *p = NULL;
2178 int r;
2179
2180 /* Make this a NOP if IPv6 is not available */
2181 if (!socket_ipv6_is_supported())
2182 return 0;
2183
2184 if (link->flags & IFF_LOOPBACK)
2185 return 0;
2186
2187 if (!link->network)
2188 return 0;
2189
2190 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/accept_ra");
2191
2192 /* We handle router advertisements ourselves, tell the kernel to GTFO */
2193 r = write_string_file(p, "0", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2194 if (r < 0)
2195 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2196
2197 return 0;
2198 }
2199
2200 static int link_set_ipv6_dad_transmits(Link *link) {
2201 char buf[DECIMAL_STR_MAX(int) + 1];
2202 const char *p = NULL;
2203 int r;
2204
2205 /* Make this a NOP if IPv6 is not available */
2206 if (!socket_ipv6_is_supported())
2207 return 0;
2208
2209 if (link->flags & IFF_LOOPBACK)
2210 return 0;
2211
2212 if (!link->network)
2213 return 0;
2214
2215 if (link->network->ipv6_dad_transmits < 0)
2216 return 0;
2217
2218 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/dad_transmits");
2219 xsprintf(buf, "%i", link->network->ipv6_dad_transmits);
2220
2221 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2222 if (r < 0)
2223 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2224
2225 return 0;
2226 }
2227
2228 static int link_set_ipv6_hop_limit(Link *link) {
2229 char buf[DECIMAL_STR_MAX(int) + 1];
2230 const char *p = NULL;
2231 int r;
2232
2233 /* Make this a NOP if IPv6 is not available */
2234 if (!socket_ipv6_is_supported())
2235 return 0;
2236
2237 if (link->flags & IFF_LOOPBACK)
2238 return 0;
2239
2240 if (!link->network)
2241 return 0;
2242
2243 if (link->network->ipv6_hop_limit < 0)
2244 return 0;
2245
2246 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/hop_limit");
2247 xsprintf(buf, "%i", link->network->ipv6_hop_limit);
2248
2249 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2250 if (r < 0)
2251 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2252
2253 return 0;
2254 }
2255
2256 static int link_drop_foreign_config(Link *link) {
2257 Address *address;
2258 Route *route;
2259 Iterator i;
2260 int r;
2261
2262 SET_FOREACH(address, link->addresses_foreign, i) {
2263 /* we consider IPv6LL addresses to be managed by the kernel */
2264 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2265 continue;
2266
2267 r = address_remove(address, link, link_address_remove_handler);
2268 if (r < 0)
2269 return r;
2270 }
2271
2272 SET_FOREACH(route, link->routes_foreign, i) {
2273 /* do not touch routes managed by the kernel */
2274 if (route->protocol == RTPROT_KERNEL)
2275 continue;
2276
2277 r = route_remove(route, link, link_route_remove_handler);
2278 if (r < 0)
2279 return r;
2280 }
2281
2282 return 0;
2283 }
2284
2285 static int link_update_lldp(Link *link) {
2286 int r;
2287
2288 assert(link);
2289
2290 if (!link->lldp)
2291 return 0;
2292
2293 if (link->flags & IFF_UP) {
2294 r = sd_lldp_start(link->lldp);
2295 if (r > 0)
2296 log_link_debug(link, "Started LLDP.");
2297 } else {
2298 r = sd_lldp_stop(link->lldp);
2299 if (r > 0)
2300 log_link_debug(link, "Stopped LLDP.");
2301 }
2302
2303 return r;
2304 }
2305
2306 static int link_configure(Link *link) {
2307 int r;
2308
2309 assert(link);
2310 assert(link->network);
2311 assert(link->state == LINK_STATE_PENDING);
2312
2313 /* Drop foreign config, but ignore loopback or critical devices.
2314 * We do not want to remove loopback address or addresses used for root NFS. */
2315 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2316 r = link_drop_foreign_config(link);
2317 if (r < 0)
2318 return r;
2319 }
2320
2321 r = link_set_bridge_fdb(link);
2322 if (r < 0)
2323 return r;
2324
2325 r = link_set_proxy_arp(link);
2326 if (r < 0)
2327 return r;
2328
2329 r = link_set_ipv4_forward(link);
2330 if (r < 0)
2331 return r;
2332
2333 r = link_set_ipv6_forward(link);
2334 if (r < 0)
2335 return r;
2336
2337 r = link_set_ipv6_privacy_extensions(link);
2338 if (r < 0)
2339 return r;
2340
2341 r = link_set_ipv6_accept_ra(link);
2342 if (r < 0)
2343 return r;
2344
2345 r = link_set_ipv6_dad_transmits(link);
2346 if (r < 0)
2347 return r;
2348
2349 r = link_set_ipv6_hop_limit(link);
2350 if (r < 0)
2351 return r;
2352
2353 if (link_ipv4ll_enabled(link)) {
2354 r = ipv4ll_configure(link);
2355 if (r < 0)
2356 return r;
2357 }
2358
2359 if (link_dhcp4_enabled(link)) {
2360 r = dhcp4_configure(link);
2361 if (r < 0)
2362 return r;
2363 }
2364
2365 if (link_dhcp4_server_enabled(link)) {
2366 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2367 if (r < 0)
2368 return r;
2369
2370 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2371 if (r < 0)
2372 return r;
2373 }
2374
2375 if (link_dhcp6_enabled(link) ||
2376 link_ipv6_accept_ra_enabled(link)) {
2377 r = dhcp6_configure(link);
2378 if (r < 0)
2379 return r;
2380 }
2381
2382 if (link_ipv6_accept_ra_enabled(link)) {
2383 r = ndisc_configure(link);
2384 if (r < 0)
2385 return r;
2386 }
2387
2388 if (link_lldp_rx_enabled(link)) {
2389 r = sd_lldp_new(&link->lldp);
2390 if (r < 0)
2391 return r;
2392
2393 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
2394 if (r < 0)
2395 return r;
2396
2397 r = sd_lldp_match_capabilities(link->lldp,
2398 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
2399 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
2400 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
2401 if (r < 0)
2402 return r;
2403
2404 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
2405 if (r < 0)
2406 return r;
2407
2408 r = sd_lldp_attach_event(link->lldp, NULL, 0);
2409 if (r < 0)
2410 return r;
2411
2412 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
2413 if (r < 0)
2414 return r;
2415
2416 r = link_update_lldp(link);
2417 if (r < 0)
2418 return r;
2419 }
2420
2421 if (link_has_carrier(link)) {
2422 r = link_acquire_conf(link);
2423 if (r < 0)
2424 return r;
2425 }
2426
2427 return link_enter_join_netdev(link);
2428 }
2429
2430 static int link_initialized_and_synced(sd_netlink *rtnl, sd_netlink_message *m,
2431 void *userdata) {
2432 _cleanup_link_unref_ Link *link = userdata;
2433 Network *network;
2434 int r;
2435
2436 assert(link);
2437 assert(link->ifname);
2438 assert(link->manager);
2439
2440 if (link->state != LINK_STATE_PENDING)
2441 return 1;
2442
2443 log_link_debug(link, "Link state is up-to-date");
2444
2445 r = link_new_bound_by_list(link);
2446 if (r < 0)
2447 return r;
2448
2449 r = link_handle_bound_by_list(link);
2450 if (r < 0)
2451 return r;
2452
2453 if (!link->network) {
2454 r = network_get(link->manager, link->udev_device, link->ifname,
2455 &link->mac, &network);
2456 if (r == -ENOENT) {
2457 link_enter_unmanaged(link);
2458 return 1;
2459 } else if (r < 0)
2460 return r;
2461
2462 if (link->flags & IFF_LOOPBACK) {
2463 if (network->link_local != ADDRESS_FAMILY_NO)
2464 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2465
2466 if (network->dhcp != ADDRESS_FAMILY_NO)
2467 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2468
2469 if (network->dhcp_server)
2470 log_link_debug(link, "Ignoring DHCP server for loopback link");
2471 }
2472
2473 r = network_apply(link->manager, network, link);
2474 if (r < 0)
2475 return r;
2476 }
2477
2478 r = link_new_bound_to_list(link);
2479 if (r < 0)
2480 return r;
2481
2482 r = link_configure(link);
2483 if (r < 0)
2484 return r;
2485
2486 return 1;
2487 }
2488
2489 int link_initialized(Link *link, struct udev_device *device) {
2490 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2491 int r;
2492
2493 assert(link);
2494 assert(link->manager);
2495 assert(link->manager->rtnl);
2496 assert(device);
2497
2498 if (link->state != LINK_STATE_PENDING)
2499 return 0;
2500
2501 if (link->udev_device)
2502 return 0;
2503
2504 log_link_debug(link, "udev initialized link");
2505
2506 link->udev_device = udev_device_ref(device);
2507
2508 /* udev has initialized the link, but we don't know if we have yet
2509 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2510 * when it returns we know that the pending NEWLINKs have already been
2511 * processed and that we are up-to-date */
2512
2513 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2514 link->ifindex);
2515 if (r < 0)
2516 return r;
2517
2518 r = sd_netlink_call_async(link->manager->rtnl, req,
2519 link_initialized_and_synced, link, 0, NULL);
2520 if (r < 0)
2521 return r;
2522
2523 link_ref(link);
2524
2525 return 0;
2526 }
2527
2528 static int link_load(Link *link) {
2529 _cleanup_free_ char *network_file = NULL,
2530 *addresses = NULL,
2531 *routes = NULL,
2532 *dhcp4_address = NULL,
2533 *ipv4ll_address = NULL;
2534 union in_addr_union address;
2535 union in_addr_union route_dst;
2536 const char *p;
2537 int r;
2538
2539 assert(link);
2540
2541 r = parse_env_file(link->state_file, NEWLINE,
2542 "NETWORK_FILE", &network_file,
2543 "ADDRESSES", &addresses,
2544 "ROUTES", &routes,
2545 "DHCP4_ADDRESS", &dhcp4_address,
2546 "IPV4LL_ADDRESS", &ipv4ll_address,
2547 NULL);
2548 if (r < 0 && r != -ENOENT)
2549 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
2550
2551 if (network_file) {
2552 Network *network;
2553 char *suffix;
2554
2555 /* drop suffix */
2556 suffix = strrchr(network_file, '.');
2557 if (!suffix) {
2558 log_link_debug(link, "Failed to get network name from %s", network_file);
2559 goto network_file_fail;
2560 }
2561 *suffix = '\0';
2562
2563 r = network_get_by_name(link->manager, basename(network_file), &network);
2564 if (r < 0) {
2565 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
2566 goto network_file_fail;
2567 }
2568
2569 r = network_apply(link->manager, network, link);
2570 if (r < 0)
2571 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
2572 }
2573
2574 network_file_fail:
2575
2576 if (addresses) {
2577 p = addresses;
2578
2579 for (;;) {
2580 _cleanup_free_ char *address_str = NULL;
2581 char *prefixlen_str;
2582 int family;
2583 unsigned char prefixlen;
2584
2585 r = extract_first_word(&p, &address_str, NULL, 0);
2586 if (r < 0) {
2587 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
2588 continue;
2589 }
2590 if (r == 0)
2591 break;
2592
2593 prefixlen_str = strchr(address_str, '/');
2594 if (!prefixlen_str) {
2595 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
2596 continue;
2597 }
2598
2599 *prefixlen_str++ = '\0';
2600
2601 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
2602 if (r != 1) {
2603 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
2604 continue;
2605 }
2606
2607 r = in_addr_from_string_auto(address_str, &family, &address);
2608 if (r < 0) {
2609 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
2610 continue;
2611 }
2612
2613 r = address_add(link, family, &address, prefixlen, NULL);
2614 if (r < 0)
2615 return log_link_error_errno(link, r, "Failed to add address: %m");
2616 }
2617 }
2618
2619 if (routes) {
2620 p = routes;
2621
2622 for (;;) {
2623 Route *route;
2624 _cleanup_free_ char *route_str = NULL;
2625 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
2626 usec_t lifetime;
2627 char *prefixlen_str;
2628 int family;
2629 unsigned char prefixlen, tos, table;
2630 uint32_t priority;
2631
2632 r = extract_first_word(&p, &route_str, NULL, 0);
2633 if (r < 0) {
2634 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
2635 continue;
2636 }
2637 if (r == 0)
2638 break;
2639
2640 prefixlen_str = strchr(route_str, '/');
2641 if (!prefixlen_str) {
2642 log_link_debug(link, "Failed to parse route %s", route_str);
2643 continue;
2644 }
2645
2646 *prefixlen_str++ = '\0';
2647
2648 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
2649 if (r != 5) {
2650 log_link_debug(link,
2651 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
2652 prefixlen_str);
2653 continue;
2654 }
2655
2656 r = in_addr_from_string_auto(route_str, &family, &route_dst);
2657 if (r < 0) {
2658 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
2659 continue;
2660 }
2661
2662 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
2663 if (r < 0)
2664 return log_link_error_errno(link, r, "Failed to add route: %m");
2665
2666 if (lifetime != USEC_INFINITY) {
2667 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
2668 0, route_expire_handler, route);
2669 if (r < 0)
2670 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
2671 }
2672
2673 route->lifetime = lifetime;
2674 sd_event_source_unref(route->expire);
2675 route->expire = expire;
2676 expire = NULL;
2677 }
2678 }
2679
2680 if (dhcp4_address) {
2681 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
2682 if (r < 0) {
2683 log_link_debug_errno(link, r, "Falied to parse DHCPv4 address %s: %m", dhcp4_address);
2684 goto dhcp4_address_fail;
2685 }
2686
2687 r = sd_dhcp_client_new(&link->dhcp_client);
2688 if (r < 0)
2689 return log_link_error_errno(link, r, "Falied to create DHCPv4 client: %m");
2690
2691 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
2692 if (r < 0)
2693 return log_link_error_errno(link, r, "Falied to set inital DHCPv4 address %s: %m", dhcp4_address);
2694 }
2695
2696 dhcp4_address_fail:
2697
2698 if (ipv4ll_address) {
2699 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
2700 if (r < 0) {
2701 log_link_debug_errno(link, r, "Falied to parse IPv4LL address %s: %m", ipv4ll_address);
2702 goto ipv4ll_address_fail;
2703 }
2704
2705 r = sd_ipv4ll_new(&link->ipv4ll);
2706 if (r < 0)
2707 return log_link_error_errno(link, r, "Falied to create IPv4LL client: %m");
2708
2709 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
2710 if (r < 0)
2711 return log_link_error_errno(link, r, "Falied to set inital IPv4LL address %s: %m", ipv4ll_address);
2712 }
2713
2714 ipv4ll_address_fail:
2715
2716 return 0;
2717 }
2718
2719 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
2720 Link *link;
2721 _cleanup_udev_device_unref_ struct udev_device *device = NULL;
2722 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
2723 int r;
2724
2725 assert(m);
2726 assert(m->rtnl);
2727 assert(message);
2728 assert(ret);
2729
2730 r = link_new(m, message, ret);
2731 if (r < 0)
2732 return r;
2733
2734 link = *ret;
2735
2736 log_link_debug(link, "Link %d added", link->ifindex);
2737
2738 r = link_load(link);
2739 if (r < 0)
2740 return r;
2741
2742 if (detect_container() <= 0) {
2743 /* not in a container, udev will be around */
2744 sprintf(ifindex_str, "n%d", link->ifindex);
2745 device = udev_device_new_from_device_id(m->udev, ifindex_str);
2746 if (!device) {
2747 r = log_link_warning_errno(link, errno, "Could not find udev device: %m");
2748 goto failed;
2749 }
2750
2751 if (udev_device_get_is_initialized(device) <= 0) {
2752 /* not yet ready */
2753 log_link_debug(link, "link pending udev initialization...");
2754 return 0;
2755 }
2756
2757 r = link_initialized(link, device);
2758 if (r < 0)
2759 goto failed;
2760 } else {
2761 /* we are calling a callback directly, so must take a ref */
2762 link_ref(link);
2763
2764 r = link_initialized_and_synced(m->rtnl, NULL, link);
2765 if (r < 0)
2766 goto failed;
2767 }
2768
2769 return 0;
2770 failed:
2771 link_enter_failed(link);
2772 return r;
2773 }
2774
2775 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
2776 int r;
2777
2778 assert(link);
2779
2780 log_link_info(link, "Gained IPv6LL");
2781
2782 link->ipv6ll_address = *address;
2783 link_check_ready(link);
2784
2785 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
2786 r = link_acquire_ipv6_conf(link);
2787 if (r < 0) {
2788 link_enter_failed(link);
2789 return r;
2790 }
2791 }
2792
2793 return 0;
2794 }
2795
2796 static int link_carrier_gained(Link *link) {
2797 int r;
2798
2799 assert(link);
2800
2801 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
2802 r = link_acquire_conf(link);
2803 if (r < 0) {
2804 link_enter_failed(link);
2805 return r;
2806 }
2807
2808 r = link_enter_set_addresses(link);
2809 if (r < 0)
2810 return r;
2811 }
2812
2813 r = link_handle_bound_by_list(link);
2814 if (r < 0)
2815 return r;
2816
2817 return 0;
2818 }
2819
2820 static int link_carrier_lost(Link *link) {
2821 int r;
2822
2823 assert(link);
2824
2825 r = link_stop_clients(link);
2826 if (r < 0) {
2827 link_enter_failed(link);
2828 return r;
2829 }
2830
2831 r = link_handle_bound_by_list(link);
2832 if (r < 0)
2833 return r;
2834
2835 return 0;
2836 }
2837
2838 int link_carrier_reset(Link *link) {
2839 int r;
2840
2841 assert(link);
2842
2843 if (link_has_carrier(link)) {
2844 r = link_carrier_lost(link);
2845 if (r < 0)
2846 return r;
2847
2848 r = link_carrier_gained(link);
2849 if (r < 0)
2850 return r;
2851
2852 log_link_info(link, "Reset carrier");
2853 }
2854
2855 return 0;
2856 }
2857
2858 int link_update(Link *link, sd_netlink_message *m) {
2859 struct ether_addr mac;
2860 const char *ifname;
2861 uint32_t mtu;
2862 bool had_carrier, carrier_gained, carrier_lost;
2863 int r;
2864
2865 assert(link);
2866 assert(link->ifname);
2867 assert(m);
2868
2869 if (link->state == LINK_STATE_LINGER) {
2870 link_ref(link);
2871 log_link_info(link, "Link readded");
2872 link_set_state(link, LINK_STATE_ENSLAVING);
2873
2874 r = link_new_carrier_maps(link);
2875 if (r < 0)
2876 return r;
2877 }
2878
2879 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
2880 if (r >= 0 && !streq(ifname, link->ifname)) {
2881 log_link_info(link, "Renamed to %s", ifname);
2882
2883 link_free_carrier_maps(link);
2884
2885 r = free_and_strdup(&link->ifname, ifname);
2886 if (r < 0)
2887 return r;
2888
2889 r = link_new_carrier_maps(link);
2890 if (r < 0)
2891 return r;
2892 }
2893
2894 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
2895 if (r >= 0 && mtu > 0) {
2896 link->mtu = mtu;
2897 if (!link->original_mtu) {
2898 link->original_mtu = mtu;
2899 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
2900 }
2901
2902 if (link->dhcp_client) {
2903 r = sd_dhcp_client_set_mtu(link->dhcp_client,
2904 link->mtu);
2905 if (r < 0) {
2906 log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
2907 return r;
2908 }
2909 }
2910 }
2911
2912 /* The kernel may broadcast NEWLINK messages without the MAC address
2913 set, simply ignore them. */
2914 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
2915 if (r >= 0) {
2916 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
2917 ETH_ALEN)) {
2918
2919 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
2920 ETH_ALEN);
2921
2922 log_link_debug(link, "MAC address: "
2923 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
2924 mac.ether_addr_octet[0],
2925 mac.ether_addr_octet[1],
2926 mac.ether_addr_octet[2],
2927 mac.ether_addr_octet[3],
2928 mac.ether_addr_octet[4],
2929 mac.ether_addr_octet[5]);
2930
2931 if (link->ipv4ll) {
2932 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
2933 if (r < 0)
2934 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
2935 }
2936
2937 if (link->dhcp_client) {
2938 const DUID *duid = link_duid(link);
2939
2940 r = sd_dhcp_client_set_mac(link->dhcp_client,
2941 (const uint8_t *) &link->mac,
2942 sizeof (link->mac),
2943 ARPHRD_ETHER);
2944 if (r < 0)
2945 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
2946
2947 r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
2948 link->network->iaid,
2949 duid->type,
2950 duid->raw_data_len > 0 ? duid->raw_data : NULL,
2951 duid->raw_data_len);
2952 if (r < 0)
2953 return log_link_warning_errno(link, r, "Could not update DUID/IAID in DHCP client: %m");
2954 }
2955
2956 if (link->dhcp6_client) {
2957 const DUID* duid = link_duid(link);
2958
2959 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
2960 (const uint8_t *) &link->mac,
2961 sizeof (link->mac),
2962 ARPHRD_ETHER);
2963 if (r < 0)
2964 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
2965
2966 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
2967 link->network->iaid);
2968 if (r < 0)
2969 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
2970
2971 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
2972 duid->type,
2973 duid->raw_data_len > 0 ? duid->raw_data : NULL,
2974 duid->raw_data_len);
2975 if (r < 0)
2976 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
2977 }
2978 }
2979 }
2980
2981 had_carrier = link_has_carrier(link);
2982
2983 r = link_update_flags(link, m);
2984 if (r < 0)
2985 return r;
2986
2987 r = link_update_lldp(link);
2988 if (r < 0)
2989 return r;
2990
2991 carrier_gained = !had_carrier && link_has_carrier(link);
2992 carrier_lost = had_carrier && !link_has_carrier(link);
2993
2994 if (carrier_gained) {
2995 log_link_info(link, "Gained carrier");
2996
2997 r = link_carrier_gained(link);
2998 if (r < 0)
2999 return r;
3000 } else if (carrier_lost) {
3001 log_link_info(link, "Lost carrier");
3002
3003 r = link_carrier_lost(link);
3004 if (r < 0)
3005 return r;
3006 }
3007
3008 return 0;
3009 }
3010
3011 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3012 bool space = false;
3013 Iterator i;
3014 Link *link;
3015
3016 assert(f);
3017 assert(prefix);
3018
3019 if (hashmap_isempty(h))
3020 return;
3021
3022 fputs(prefix, f);
3023 HASHMAP_FOREACH(link, h, i) {
3024 if (space)
3025 fputc(' ', f);
3026
3027 fprintf(f, "%i", link->ifindex);
3028 space = true;
3029 }
3030
3031 fputc('\n', f);
3032 }
3033
3034 int link_save(Link *link) {
3035 _cleanup_free_ char *temp_path = NULL;
3036 _cleanup_fclose_ FILE *f = NULL;
3037 const char *admin_state, *oper_state;
3038 Address *a;
3039 Route *route;
3040 Iterator i;
3041 int r;
3042
3043 assert(link);
3044 assert(link->state_file);
3045 assert(link->lease_file);
3046 assert(link->manager);
3047
3048 if (link->state == LINK_STATE_LINGER) {
3049 unlink(link->state_file);
3050 return 0;
3051 }
3052
3053 link_lldp_save(link);
3054
3055 admin_state = link_state_to_string(link->state);
3056 assert(admin_state);
3057
3058 oper_state = link_operstate_to_string(link->operstate);
3059 assert(oper_state);
3060
3061 r = fopen_temporary(link->state_file, &f, &temp_path);
3062 if (r < 0)
3063 goto fail;
3064
3065 fchmod(fileno(f), 0644);
3066
3067 fprintf(f,
3068 "# This is private data. Do not parse.\n"
3069 "ADMIN_STATE=%s\n"
3070 "OPER_STATE=%s\n",
3071 admin_state, oper_state);
3072
3073 if (link->network) {
3074 bool space;
3075 sd_dhcp6_lease *dhcp6_lease = NULL;
3076 const char *dhcp_domainname = NULL;
3077 char **dhcp6_domains = NULL;
3078
3079 if (link->dhcp6_client) {
3080 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3081 if (r < 0 && r != -ENOMSG)
3082 log_link_debug(link, "No DHCPv6 lease");
3083 }
3084
3085 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3086
3087 fputs("DNS=", f);
3088 space = false;
3089 fputstrv(f, link->network->dns, NULL, &space);
3090
3091 if (link->network->dhcp_use_dns &&
3092 link->dhcp_lease) {
3093 const struct in_addr *addresses;
3094
3095 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3096 if (r > 0) {
3097 if (space)
3098 fputc(' ', f);
3099 serialize_in_addrs(f, addresses, r);
3100 space = true;
3101 }
3102 }
3103
3104 if (link->network->dhcp_use_dns && dhcp6_lease) {
3105 struct in6_addr *in6_addrs;
3106
3107 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3108 if (r > 0) {
3109 if (space)
3110 fputc(' ', f);
3111 serialize_in6_addrs(f, in6_addrs, r);
3112 space = true;
3113 }
3114 }
3115
3116 /* Make sure to flush out old entries before we use the NDISC data */
3117 ndisc_vacuum(link);
3118
3119 if (link->network->dhcp_use_dns && link->ndisc_rdnss) {
3120 NDiscRDNSS *dd;
3121
3122 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3123 if (space)
3124 fputc(' ', f);
3125
3126 serialize_in6_addrs(f, &dd->address, 1);
3127 space = true;
3128 }
3129 }
3130
3131 fputc('\n', f);
3132
3133 fputs("NTP=", f);
3134 space = false;
3135 fputstrv(f, link->network->ntp, NULL, &space);
3136
3137 if (link->network->dhcp_use_ntp &&
3138 link->dhcp_lease) {
3139 const struct in_addr *addresses;
3140
3141 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3142 if (r > 0) {
3143 if (space)
3144 fputc(' ', f);
3145 serialize_in_addrs(f, addresses, r);
3146 space = true;
3147 }
3148 }
3149
3150 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3151 struct in6_addr *in6_addrs;
3152 char **hosts;
3153
3154 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3155 &in6_addrs);
3156 if (r > 0) {
3157 if (space)
3158 fputc(' ', f);
3159 serialize_in6_addrs(f, in6_addrs, r);
3160 space = true;
3161 }
3162
3163 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3164 if (r > 0)
3165 fputstrv(f, hosts, NULL, &space);
3166 }
3167
3168 fputc('\n', f);
3169
3170 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3171 if (link->dhcp_lease)
3172 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3173 if (dhcp6_lease)
3174 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3175 }
3176
3177 fputs("DOMAINS=", f);
3178 fputstrv(f, link->network->search_domains, NULL, &space);
3179
3180 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3181 NDiscDNSSL *dd;
3182
3183 if (dhcp_domainname)
3184 fputs_with_space(f, dhcp_domainname, NULL, &space);
3185 if (dhcp6_domains)
3186 fputstrv(f, dhcp6_domains, NULL, &space);
3187
3188 SET_FOREACH(dd, link->ndisc_dnssl, i)
3189 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3190 }
3191
3192 fputc('\n', f);
3193
3194 fputs("ROUTE_DOMAINS=", f);
3195 fputstrv(f, link->network->route_domains, NULL, NULL);
3196
3197 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3198 NDiscDNSSL *dd;
3199
3200 if (dhcp_domainname)
3201 fputs_with_space(f, dhcp_domainname, NULL, &space);
3202 if (dhcp6_domains)
3203 fputstrv(f, dhcp6_domains, NULL, &space);
3204
3205 SET_FOREACH(dd, link->ndisc_dnssl, i)
3206 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3207 }
3208
3209 fputc('\n', f);
3210
3211 fprintf(f, "LLMNR=%s\n",
3212 resolve_support_to_string(link->network->llmnr));
3213 fprintf(f, "MDNS=%s\n",
3214 resolve_support_to_string(link->network->mdns));
3215
3216 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3217 fprintf(f, "DNSSEC=%s\n",
3218 dnssec_mode_to_string(link->network->dnssec_mode));
3219
3220 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3221 const char *n;
3222
3223 fputs("DNSSEC_NTA=", f);
3224 space = false;
3225 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3226 fputs_with_space(f, n, NULL, &space);
3227 fputc('\n', f);
3228 }
3229
3230 fputs("ADDRESSES=", f);
3231 space = false;
3232 SET_FOREACH(a, link->addresses, i) {
3233 _cleanup_free_ char *address_str = NULL;
3234
3235 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3236 if (r < 0)
3237 goto fail;
3238
3239 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3240 space = true;
3241 }
3242 fputc('\n', f);
3243
3244 fputs("ROUTES=", f);
3245 space = false;
3246 SET_FOREACH(route, link->routes, i) {
3247 _cleanup_free_ char *route_str = NULL;
3248
3249 r = in_addr_to_string(route->family, &route->dst, &route_str);
3250 if (r < 0)
3251 goto fail;
3252
3253 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%hhu/"USEC_FMT, space ? " " : "", route_str,
3254 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3255 space = true;
3256 }
3257
3258 fputc('\n', f);
3259 }
3260
3261 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3262 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3263
3264 if (link->dhcp_lease) {
3265 struct in_addr address;
3266 const char *tz = NULL;
3267
3268 assert(link->network);
3269
3270 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3271 if (r >= 0)
3272 fprintf(f, "TIMEZONE=%s\n", tz);
3273
3274 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3275 if (r >= 0) {
3276 fputs("DHCP4_ADDRESS=", f);
3277 serialize_in_addrs(f, &address, 1);
3278 fputc('\n', f);
3279 }
3280
3281 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3282 if (r < 0)
3283 goto fail;
3284
3285 fprintf(f,
3286 "DHCP_LEASE=%s\n",
3287 link->lease_file);
3288 } else
3289 unlink(link->lease_file);
3290
3291 if (link->ipv4ll) {
3292 struct in_addr address;
3293
3294 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3295 if (r >= 0) {
3296 fputs("IPV4LL_ADDRESS=", f);
3297 serialize_in_addrs(f, &address, 1);
3298 fputc('\n', f);
3299 }
3300 }
3301
3302 r = fflush_and_check(f);
3303 if (r < 0)
3304 goto fail;
3305
3306 if (rename(temp_path, link->state_file) < 0) {
3307 r = -errno;
3308 goto fail;
3309 }
3310
3311 return 0;
3312
3313 fail:
3314 (void) unlink(link->state_file);
3315 if (temp_path)
3316 (void) unlink(temp_path);
3317
3318 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3319 }
3320
3321 /* The serialized state in /run is no longer up-to-date. */
3322 void link_dirty(Link *link) {
3323 int r;
3324
3325 assert(link);
3326
3327 /* mark manager dirty as link is dirty */
3328 manager_dirty(link->manager);
3329
3330 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3331 if (r < 0)
3332 /* allocation errors are ignored */
3333 return;
3334
3335 r = set_put(link->manager->dirty_links, link);
3336 if (r <= 0)
3337 /* don't take another ref if the link was already dirty */
3338 return;
3339
3340 link_ref(link);
3341 }
3342
3343 /* The serialized state in /run is up-to-date */
3344 void link_clean(Link *link) {
3345 assert(link);
3346 assert(link->manager);
3347
3348 set_remove(link->manager->dirty_links, link);
3349 link_unref(link);
3350 }
3351
3352 static const char* const link_state_table[_LINK_STATE_MAX] = {
3353 [LINK_STATE_PENDING] = "pending",
3354 [LINK_STATE_ENSLAVING] = "configuring",
3355 [LINK_STATE_SETTING_ADDRESSES] = "configuring",
3356 [LINK_STATE_SETTING_ROUTES] = "configuring",
3357 [LINK_STATE_CONFIGURED] = "configured",
3358 [LINK_STATE_UNMANAGED] = "unmanaged",
3359 [LINK_STATE_FAILED] = "failed",
3360 [LINK_STATE_LINGER] = "linger",
3361 };
3362
3363 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
3364
3365 static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
3366 [LINK_OPERSTATE_OFF] = "off",
3367 [LINK_OPERSTATE_NO_CARRIER] = "no-carrier",
3368 [LINK_OPERSTATE_DORMANT] = "dormant",
3369 [LINK_OPERSTATE_CARRIER] = "carrier",
3370 [LINK_OPERSTATE_DEGRADED] = "degraded",
3371 [LINK_OPERSTATE_ROUTABLE] = "routable",
3372 };
3373
3374 DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
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