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[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 log_link_info(link, "IPv6 %sd for interface: %m", enable_disable(!disabled));
261
262 return 0;
263 }
264
265 void link_update_operstate(Link *link) {
266 LinkOperationalState operstate;
267 assert(link);
268
269 if (link->kernel_operstate == IF_OPER_DORMANT)
270 operstate = LINK_OPERSTATE_DORMANT;
271 else if (link_has_carrier(link)) {
272 Address *address;
273 uint8_t scope = RT_SCOPE_NOWHERE;
274 Iterator i;
275
276 /* if we have carrier, check what addresses we have */
277 SET_FOREACH(address, link->addresses, i) {
278 if (!address_is_ready(address))
279 continue;
280
281 if (address->scope < scope)
282 scope = address->scope;
283 }
284
285 /* for operstate we also take foreign addresses into account */
286 SET_FOREACH(address, link->addresses_foreign, i) {
287 if (!address_is_ready(address))
288 continue;
289
290 if (address->scope < scope)
291 scope = address->scope;
292 }
293
294 if (scope < RT_SCOPE_SITE)
295 /* universally accessible addresses found */
296 operstate = LINK_OPERSTATE_ROUTABLE;
297 else if (scope < RT_SCOPE_HOST)
298 /* only link or site local addresses found */
299 operstate = LINK_OPERSTATE_DEGRADED;
300 else
301 /* no useful addresses found */
302 operstate = LINK_OPERSTATE_CARRIER;
303 } else if (link->flags & IFF_UP)
304 operstate = LINK_OPERSTATE_NO_CARRIER;
305 else
306 operstate = LINK_OPERSTATE_OFF;
307
308 if (link->operstate != operstate) {
309 link->operstate = operstate;
310 link_send_changed(link, "OperationalState", NULL);
311 link_dirty(link);
312 }
313 }
314
315 #define FLAG_STRING(string, flag, old, new) \
316 (((old ^ new) & flag) \
317 ? ((old & flag) ? (" -" string) : (" +" string)) \
318 : "")
319
320 static int link_update_flags(Link *link, sd_netlink_message *m) {
321 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
322 uint8_t operstate;
323 int r;
324
325 assert(link);
326
327 r = sd_rtnl_message_link_get_flags(m, &flags);
328 if (r < 0)
329 return log_link_warning_errno(link, r, "Could not get link flags: %m");
330
331 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
332 if (r < 0)
333 /* if we got a message without operstate, take it to mean
334 the state was unchanged */
335 operstate = link->kernel_operstate;
336
337 if ((link->flags == flags) && (link->kernel_operstate == operstate))
338 return 0;
339
340 if (link->flags != flags) {
341 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",
342 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
343 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
344 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
345 FLAG_STRING("UP", IFF_UP, link->flags, flags),
346 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
347 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
348 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
349 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
350 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
351 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
352 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
353 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
354 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
355 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
356 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
357 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
358 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
359 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
360 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
361
362 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
363 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
364 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
365 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
366 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
367 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
368 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
369 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
370
371 /* link flags are currently at most 18 bits, let's align to
372 * printing 20 */
373 if (unknown_flags_added)
374 log_link_debug(link,
375 "Unknown link flags gained: %#.5x (ignoring)",
376 unknown_flags_added);
377
378 if (unknown_flags_removed)
379 log_link_debug(link,
380 "Unknown link flags lost: %#.5x (ignoring)",
381 unknown_flags_removed);
382 }
383
384 link->flags = flags;
385 link->kernel_operstate = operstate;
386
387 link_update_operstate(link);
388
389 return 0;
390 }
391
392 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
393 _cleanup_link_unref_ Link *link = NULL;
394 uint16_t type;
395 const char *ifname, *kind = NULL;
396 int r, ifindex;
397 unsigned short iftype;
398
399 assert(manager);
400 assert(message);
401 assert(ret);
402
403 /* check for link kind */
404 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
405 if (r == 0) {
406 (void)sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
407 r = sd_netlink_message_exit_container(message);
408 if (r < 0)
409 return r;
410 }
411
412 r = sd_netlink_message_get_type(message, &type);
413 if (r < 0)
414 return r;
415 else if (type != RTM_NEWLINK)
416 return -EINVAL;
417
418 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
419 if (r < 0)
420 return r;
421 else if (ifindex <= 0)
422 return -EINVAL;
423
424 r = sd_rtnl_message_link_get_type(message, &iftype);
425 if (r < 0)
426 return r;
427
428 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
429 if (r < 0)
430 return r;
431
432 link = new0(Link, 1);
433 if (!link)
434 return -ENOMEM;
435
436 link->n_ref = 1;
437 link->manager = manager;
438 link->state = LINK_STATE_PENDING;
439 link->rtnl_extended_attrs = true;
440 link->ifindex = ifindex;
441 link->iftype = iftype;
442 link->ifname = strdup(ifname);
443 if (!link->ifname)
444 return -ENOMEM;
445
446 if (kind) {
447 link->kind = strdup(kind);
448 if (!link->kind)
449 return -ENOMEM;
450 }
451
452 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
453 if (r < 0)
454 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
455
456 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
457 return -ENOMEM;
458
459 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
460 return -ENOMEM;
461
462 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
463 return -ENOMEM;
464
465 r = hashmap_ensure_allocated(&manager->links, NULL);
466 if (r < 0)
467 return r;
468
469 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
470 if (r < 0)
471 return r;
472
473 r = link_update_flags(link, message);
474 if (r < 0)
475 return r;
476
477 *ret = link;
478 link = NULL;
479
480 return 0;
481 }
482
483 static void link_free(Link *link) {
484 Address *address;
485 Iterator i;
486 Link *carrier;
487
488 if (!link)
489 return;
490
491 while (!set_isempty(link->addresses))
492 address_free(set_first(link->addresses));
493
494 while (!set_isempty(link->addresses_foreign))
495 address_free(set_first(link->addresses_foreign));
496
497 link->addresses = set_free(link->addresses);
498
499 link->addresses_foreign = set_free(link->addresses_foreign);
500
501 while ((address = link->pool_addresses)) {
502 LIST_REMOVE(addresses, link->pool_addresses, address);
503 address_free(address);
504 }
505
506 sd_dhcp_server_unref(link->dhcp_server);
507 sd_dhcp_client_unref(link->dhcp_client);
508 sd_dhcp_lease_unref(link->dhcp_lease);
509
510 link_lldp_emit_stop(link);
511
512 free(link->lease_file);
513
514 sd_lldp_unref(link->lldp);
515 free(link->lldp_file);
516
517 ndisc_flush(link);
518
519 sd_ipv4ll_unref(link->ipv4ll);
520 sd_dhcp6_client_unref(link->dhcp6_client);
521 sd_ndisc_unref(link->ndisc);
522
523 if (link->manager)
524 hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex));
525
526 free(link->ifname);
527
528 free(link->kind);
529
530 (void)unlink(link->state_file);
531 free(link->state_file);
532
533 udev_device_unref(link->udev_device);
534
535 HASHMAP_FOREACH (carrier, link->bound_to_links, i)
536 hashmap_remove(link->bound_to_links, INT_TO_PTR(carrier->ifindex));
537 hashmap_free(link->bound_to_links);
538
539 HASHMAP_FOREACH (carrier, link->bound_by_links, i)
540 hashmap_remove(link->bound_by_links, INT_TO_PTR(carrier->ifindex));
541 hashmap_free(link->bound_by_links);
542
543 free(link);
544 }
545
546 Link *link_unref(Link *link) {
547 if (!link)
548 return NULL;
549
550 assert(link->n_ref > 0);
551
552 link->n_ref--;
553
554 if (link->n_ref > 0)
555 return NULL;
556
557 link_free(link);
558
559 return NULL;
560 }
561
562 Link *link_ref(Link *link) {
563 if (!link)
564 return NULL;
565
566 assert(link->n_ref > 0);
567
568 link->n_ref++;
569
570 return link;
571 }
572
573 int link_get(Manager *m, int ifindex, Link **ret) {
574 Link *link;
575
576 assert(m);
577 assert(ifindex);
578 assert(ret);
579
580 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
581 if (!link)
582 return -ENODEV;
583
584 *ret = link;
585
586 return 0;
587 }
588
589 static void link_set_state(Link *link, LinkState state) {
590 assert(link);
591
592 if (link->state == state)
593 return;
594
595 link->state = state;
596
597 link_send_changed(link, "AdministrativeState", NULL);
598 }
599
600 static void link_enter_unmanaged(Link *link) {
601 assert(link);
602
603 log_link_debug(link, "Unmanaged");
604
605 link_set_state(link, LINK_STATE_UNMANAGED);
606
607 link_dirty(link);
608 }
609
610 static int link_stop_clients(Link *link) {
611 int r = 0, k;
612
613 assert(link);
614 assert(link->manager);
615 assert(link->manager->event);
616
617 if (link->dhcp_client) {
618 k = sd_dhcp_client_stop(link->dhcp_client);
619 if (k < 0)
620 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
621 }
622
623 if (link->ipv4ll) {
624 k = sd_ipv4ll_stop(link->ipv4ll);
625 if (k < 0)
626 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
627 }
628
629 if (link->dhcp6_client) {
630 k = sd_dhcp6_client_stop(link->dhcp6_client);
631 if (k < 0)
632 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
633 }
634
635 if (link->ndisc) {
636 k = sd_ndisc_stop(link->ndisc);
637 if (k < 0)
638 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
639 }
640
641 link_lldp_emit_stop(link);
642 return r;
643 }
644
645 void link_enter_failed(Link *link) {
646 assert(link);
647
648 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
649 return;
650
651 log_link_warning(link, "Failed");
652
653 link_set_state(link, LINK_STATE_FAILED);
654
655 link_stop_clients(link);
656
657 link_dirty(link);
658 }
659
660 static Address* link_find_dhcp_server_address(Link *link) {
661 Address *address;
662
663 assert(link);
664 assert(link->network);
665
666 /* The first statically configured address if there is any */
667 LIST_FOREACH(addresses, address, link->network->static_addresses) {
668
669 if (address->family != AF_INET)
670 continue;
671
672 if (in_addr_is_null(address->family, &address->in_addr))
673 continue;
674
675 return address;
676 }
677
678 /* If that didn't work, find a suitable address we got from the pool */
679 LIST_FOREACH(addresses, address, link->pool_addresses) {
680 if (address->family != AF_INET)
681 continue;
682
683 return address;
684 }
685
686 return NULL;
687 }
688
689 static int link_enter_configured(Link *link) {
690 assert(link);
691 assert(link->network);
692 assert(link->state == LINK_STATE_SETTING_ROUTES);
693
694 log_link_info(link, "Configured");
695
696 link_set_state(link, LINK_STATE_CONFIGURED);
697
698 link_dirty(link);
699
700 return 0;
701 }
702
703 void link_check_ready(Link *link) {
704 Address *a;
705 Iterator i;
706
707 assert(link);
708
709 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
710 return;
711
712 if (!link->network)
713 return;
714
715 if (!link->static_configured)
716 return;
717
718 if (link_ipv4ll_enabled(link))
719 if (!link->ipv4ll_address ||
720 !link->ipv4ll_route)
721 return;
722
723 if (link_ipv6ll_enabled(link))
724 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) > 0)
725 return;
726
727 if ((link_dhcp4_enabled(link) && !link_dhcp6_enabled(link) &&
728 !link->dhcp4_configured) ||
729 (link_dhcp6_enabled(link) && !link_dhcp4_enabled(link) &&
730 !link->dhcp6_configured) ||
731 (link_dhcp4_enabled(link) && link_dhcp6_enabled(link) &&
732 !link->dhcp4_configured && !link->dhcp6_configured))
733 return;
734
735 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
736 return;
737
738 SET_FOREACH(a, link->addresses, i)
739 if (!address_is_ready(a))
740 return;
741
742 if (link->state != LINK_STATE_CONFIGURED)
743 link_enter_configured(link);
744
745 return;
746 }
747
748 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
749 _cleanup_link_unref_ Link *link = userdata;
750 int r;
751
752 assert(link->link_messages > 0);
753 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
754 LINK_STATE_SETTING_ROUTES, LINK_STATE_FAILED,
755 LINK_STATE_LINGER));
756
757 link->link_messages--;
758
759 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
760 return 1;
761
762 r = sd_netlink_message_get_errno(m);
763 if (r < 0 && r != -EEXIST)
764 log_link_warning_errno(link, r, "Could not set route: %m");
765
766 if (link->link_messages == 0) {
767 log_link_debug(link, "Routes set");
768 link->static_configured = true;
769 link_check_ready(link);
770 }
771
772 return 1;
773 }
774
775 static int link_enter_set_routes(Link *link) {
776 Route *rt;
777 int r;
778
779 assert(link);
780 assert(link->network);
781 assert(link->state == LINK_STATE_SETTING_ADDRESSES);
782
783 link_set_state(link, LINK_STATE_SETTING_ROUTES);
784
785 LIST_FOREACH(routes, rt, link->network->static_routes) {
786 r = route_configure(rt, link, route_handler);
787 if (r < 0) {
788 log_link_warning_errno(link, r, "Could not set routes: %m");
789 link_enter_failed(link);
790 return r;
791 }
792
793 link->link_messages++;
794 }
795
796 if (link->link_messages == 0) {
797 link->static_configured = true;
798 link_check_ready(link);
799 } else
800 log_link_debug(link, "Setting routes");
801
802 return 0;
803 }
804
805 int link_route_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
806 _cleanup_link_unref_ Link *link = userdata;
807 int r;
808
809 assert(m);
810 assert(link);
811 assert(link->ifname);
812
813 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
814 return 1;
815
816 r = sd_netlink_message_get_errno(m);
817 if (r < 0 && r != -ESRCH)
818 log_link_warning_errno(link, r, "Could not drop route: %m");
819
820 return 1;
821 }
822
823 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
824 _cleanup_link_unref_ Link *link = userdata;
825 int r;
826
827 assert(rtnl);
828 assert(m);
829 assert(link);
830 assert(link->ifname);
831 assert(link->link_messages > 0);
832 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
833 LINK_STATE_FAILED, LINK_STATE_LINGER));
834
835 link->link_messages--;
836
837 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
838 return 1;
839
840 r = sd_netlink_message_get_errno(m);
841 if (r < 0 && r != -EEXIST)
842 log_link_warning_errno(link, r, "could not set address: %m");
843 else if (r >= 0)
844 manager_rtnl_process_address(rtnl, m, link->manager);
845
846 if (link->link_messages == 0) {
847 log_link_debug(link, "Addresses set");
848 link_enter_set_routes(link);
849 }
850
851 return 1;
852 }
853
854 static int link_push_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
855 _cleanup_free_ struct in_addr *addresses = NULL;
856 size_t n_addresses = 0, n_allocated = 0;
857 char **a;
858
859 log_debug("Copying DNS server information from %s", link->ifname);
860
861 if (!link->network)
862 return 0;
863
864 STRV_FOREACH(a, link->network->dns) {
865 struct in_addr ia;
866
867 /* Only look for IPv4 addresses */
868 if (inet_pton(AF_INET, *a, &ia) <= 0)
869 continue;
870
871 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
872 return log_oom();
873
874 addresses[n_addresses++] = ia;
875 }
876
877 if (link->network->dhcp_use_dns &&
878 link->dhcp_lease) {
879 const struct in_addr *da = NULL;
880 int n;
881
882 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
883 if (n > 0) {
884
885 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
886 return log_oom();
887
888 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
889 n_addresses += n;
890 }
891 }
892
893 if (n_addresses <= 0)
894 return 0;
895
896 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
897 }
898
899 static int link_push_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
900 _cleanup_free_ struct in_addr *addresses = NULL;
901 size_t n_addresses = 0, n_allocated = 0;
902 char **a;
903
904 if (!link->network)
905 return 0;
906
907 log_debug("Copying NTP server information from %s", link->ifname);
908
909 STRV_FOREACH(a, link->network->ntp) {
910 struct in_addr ia;
911
912 /* Only look for IPv4 addresses */
913 if (inet_pton(AF_INET, *a, &ia) <= 0)
914 continue;
915
916 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
917 return log_oom();
918
919 addresses[n_addresses++] = ia;
920 }
921
922 if (link->network->dhcp_use_ntp &&
923 link->dhcp_lease) {
924 const struct in_addr *da = NULL;
925 int n;
926
927 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
928 if (n > 0) {
929
930 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
931 return log_oom();
932
933 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
934 n_addresses += n;
935 }
936 }
937
938 if (n_addresses <= 0)
939 return 0;
940
941 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
942 }
943
944 static int link_set_bridge_fdb(Link *link) {
945 FdbEntry *fdb_entry;
946 int r;
947
948 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
949 r = fdb_entry_configure(link, fdb_entry);
950 if (r < 0)
951 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
952 }
953
954 return 0;
955 }
956
957 static int link_enter_set_addresses(Link *link) {
958 Address *ad;
959 int r;
960
961 assert(link);
962 assert(link->network);
963 assert(link->state != _LINK_STATE_INVALID);
964
965 r = link_set_bridge_fdb(link);
966 if (r < 0)
967 return r;
968
969 link_set_state(link, LINK_STATE_SETTING_ADDRESSES);
970
971 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
972 r = address_configure(ad, link, address_handler, false);
973 if (r < 0) {
974 log_link_warning_errno(link, r, "Could not set addresses: %m");
975 link_enter_failed(link);
976 return r;
977 }
978
979 link->link_messages++;
980 }
981
982 /* now that we can figure out a default address for the dhcp server,
983 start it */
984 if (link_dhcp4_server_enabled(link)) {
985 Address *address;
986 Link *uplink = NULL;
987 bool acquired_uplink = false;
988
989 address = link_find_dhcp_server_address(link);
990 if (!address) {
991 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
992 link_enter_failed(link);
993 return 0;
994 }
995
996 /* use the server address' subnet as the pool */
997 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
998 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
999 if (r < 0)
1000 return r;
1001
1002 /* TODO:
1003 r = sd_dhcp_server_set_router(link->dhcp_server,
1004 &main_address->in_addr.in);
1005 if (r < 0)
1006 return r;
1007 */
1008
1009 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1010 r = sd_dhcp_server_set_max_lease_time(
1011 link->dhcp_server,
1012 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1013 if (r < 0)
1014 return r;
1015 }
1016
1017 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1018 r = sd_dhcp_server_set_default_lease_time(
1019 link->dhcp_server,
1020 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1021 if (r < 0)
1022 return r;
1023 }
1024
1025 if (link->network->dhcp_server_emit_dns) {
1026
1027 if (link->network->n_dhcp_server_dns > 0)
1028 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1029 else {
1030 uplink = manager_find_uplink(link->manager, link);
1031 acquired_uplink = true;
1032
1033 if (!uplink) {
1034 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1035 r = 0;
1036 } else
1037 r = link_push_dns_to_dhcp_server(uplink, link->dhcp_server);
1038 }
1039 if (r < 0)
1040 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1041 }
1042
1043
1044 if (link->network->dhcp_server_emit_ntp) {
1045
1046 if (link->network->n_dhcp_server_ntp > 0)
1047 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1048 else {
1049 if (!acquired_uplink)
1050 uplink = manager_find_uplink(link->manager, link);
1051
1052 if (!uplink) {
1053 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1054 r = 0;
1055 } else
1056 r = link_push_ntp_to_dhcp_server(uplink, link->dhcp_server);
1057
1058 }
1059 if (r < 0)
1060 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1061 }
1062
1063 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1064 if (r < 0) {
1065 log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1066 return r;
1067 }
1068
1069 if (link->network->dhcp_server_emit_timezone) {
1070 _cleanup_free_ char *buffer = NULL;
1071 const char *tz = NULL;
1072
1073 if (link->network->dhcp_server_timezone)
1074 tz = link->network->dhcp_server_timezone;
1075 else {
1076 r = get_timezone(&buffer);
1077 if (r < 0)
1078 log_warning_errno(r, "Failed to determine timezone: %m");
1079 else
1080 tz = buffer;
1081 }
1082
1083 if (tz) {
1084 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1085 if (r < 0)
1086 return r;
1087 }
1088 }
1089
1090 r = sd_dhcp_server_start(link->dhcp_server);
1091 if (r < 0) {
1092 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1093
1094 link_enter_failed(link);
1095
1096 return 0;
1097 }
1098
1099 log_link_debug(link, "Offering DHCPv4 leases");
1100 }
1101
1102 if (link->link_messages == 0)
1103 link_enter_set_routes(link);
1104 else
1105 log_link_debug(link, "Setting addresses");
1106
1107 return 0;
1108 }
1109
1110 int link_address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1111 _cleanup_link_unref_ Link *link = userdata;
1112 int r;
1113
1114 assert(m);
1115 assert(link);
1116 assert(link->ifname);
1117
1118 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1119 return 1;
1120
1121 r = sd_netlink_message_get_errno(m);
1122 if (r < 0 && r != -EADDRNOTAVAIL)
1123 log_link_warning_errno(link, r, "Could not drop address: %m");
1124
1125 return 1;
1126 }
1127
1128 static int link_set_bridge_vlan(Link *link) {
1129 int r = 0;
1130
1131 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1132 if (r < 0)
1133 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1134
1135 return r;
1136 }
1137
1138 static int link_set_proxy_arp(Link *link) {
1139 const char *p = NULL;
1140 int r;
1141
1142 if (!link_proxy_arp_enabled(link))
1143 return 0;
1144
1145 p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/proxy_arp");
1146
1147 r = write_string_file(p, one_zero(link->network->proxy_arp), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
1148 if (r < 0)
1149 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1150
1151 return 0;
1152 }
1153
1154 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1155 _cleanup_link_unref_ Link *link = userdata;
1156 int r;
1157
1158 log_link_debug(link, "Set link");
1159
1160 r = sd_netlink_message_get_errno(m);
1161 if (r < 0 && r != -EEXIST) {
1162 log_link_error_errno(link, r, "Could not join netdev: %m");
1163 link_enter_failed(link);
1164 return 1;
1165 }
1166
1167 return 0;
1168 }
1169
1170 static int set_hostname_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
1171 _cleanup_link_unref_ Link *link = userdata;
1172 const sd_bus_error *e;
1173
1174 assert(m);
1175 assert(link);
1176
1177 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1178 return 1;
1179
1180 e = sd_bus_message_get_error(m);
1181 if (e)
1182 log_link_warning_errno(link, sd_bus_error_get_errno(e), "Could not set hostname: %s", e->message);
1183
1184 return 1;
1185 }
1186
1187 int link_set_hostname(Link *link, const char *hostname) {
1188 int r;
1189
1190 assert(link);
1191 assert(link->manager);
1192
1193 log_link_debug(link, "Setting transient hostname: '%s'", strna(hostname));
1194
1195 if (!link->manager->bus) {
1196 /* TODO: replace by assert when we can rely on kdbus */
1197 log_link_info(link, "Not connected to system bus, ignoring transient hostname.");
1198 return 0;
1199 }
1200
1201 r = sd_bus_call_method_async(
1202 link->manager->bus,
1203 NULL,
1204 "org.freedesktop.hostname1",
1205 "/org/freedesktop/hostname1",
1206 "org.freedesktop.hostname1",
1207 "SetHostname",
1208 set_hostname_handler,
1209 link,
1210 "sb",
1211 hostname,
1212 false);
1213
1214 if (r < 0)
1215 return log_link_error_errno(link, r, "Could not set transient hostname: %m");
1216
1217 link_ref(link);
1218
1219 return 0;
1220 }
1221
1222 static int set_timezone_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
1223 _cleanup_link_unref_ Link *link = userdata;
1224 const sd_bus_error *e;
1225
1226 assert(m);
1227 assert(link);
1228
1229 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1230 return 1;
1231
1232 e = sd_bus_message_get_error(m);
1233 if (e)
1234 log_link_warning_errno(link, sd_bus_error_get_errno(e), "Could not set timezone: %s", e->message);
1235
1236 return 1;
1237 }
1238
1239 int link_set_timezone(Link *link, const char *tz) {
1240 int r;
1241
1242 assert(link);
1243 assert(link->manager);
1244 assert(tz);
1245
1246 log_link_debug(link, "Setting system timezone: '%s'", tz);
1247
1248 if (!link->manager->bus) {
1249 log_link_info(link, "Not connected to system bus, ignoring timezone.");
1250 return 0;
1251 }
1252
1253 r = sd_bus_call_method_async(
1254 link->manager->bus,
1255 NULL,
1256 "org.freedesktop.timedate1",
1257 "/org/freedesktop/timedate1",
1258 "org.freedesktop.timedate1",
1259 "SetTimezone",
1260 set_timezone_handler,
1261 link,
1262 "sb",
1263 tz,
1264 false);
1265 if (r < 0)
1266 return log_link_error_errno(link, r, "Could not set timezone: %m");
1267
1268 link_ref(link);
1269
1270 return 0;
1271 }
1272
1273 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1274 _cleanup_link_unref_ Link *link = userdata;
1275 int r;
1276
1277 assert(m);
1278 assert(link);
1279 assert(link->ifname);
1280
1281 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1282 return 1;
1283
1284 r = sd_netlink_message_get_errno(m);
1285 if (r < 0)
1286 log_link_warning_errno(link, r, "Could not set MTU: %m");
1287
1288 return 1;
1289 }
1290
1291 int link_set_mtu(Link *link, uint32_t mtu) {
1292 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1293 int r;
1294
1295 assert(link);
1296 assert(link->manager);
1297 assert(link->manager->rtnl);
1298
1299 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1300
1301 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1302 if (r < 0)
1303 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1304
1305 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1306 if (r < 0)
1307 return log_link_error_errno(link, r, "Could not append MTU: %m");
1308
1309 r = sd_netlink_call_async(link->manager->rtnl, req, set_mtu_handler, link, 0, NULL);
1310 if (r < 0)
1311 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1312
1313 link_ref(link);
1314
1315 return 0;
1316 }
1317
1318 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1319 _cleanup_link_unref_ Link *link = userdata;
1320 int r;
1321
1322 assert(m);
1323 assert(link);
1324 assert(link->ifname);
1325
1326 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1327 return 1;
1328
1329 r = sd_netlink_message_get_errno(m);
1330 if (r < 0)
1331 log_link_warning_errno(link, r, "Could not set link flags: %m");
1332
1333 return 1;
1334 }
1335
1336 static int link_set_flags(Link *link) {
1337 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1338 unsigned ifi_change = 0;
1339 unsigned ifi_flags = 0;
1340 int r;
1341
1342 assert(link);
1343 assert(link->manager);
1344 assert(link->manager->rtnl);
1345
1346 if (link->flags & IFF_LOOPBACK)
1347 return 0;
1348
1349 if (!link->network)
1350 return 0;
1351
1352 if (link->network->arp < 0)
1353 return 0;
1354
1355 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1356 if (r < 0)
1357 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1358
1359 if (link->network->arp >= 0) {
1360 ifi_change |= IFF_NOARP;
1361 ifi_flags |= link->network->arp ? 0 : IFF_NOARP;
1362 }
1363
1364 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1365 if (r < 0)
1366 return log_link_error_errno(link, r, "Could not set link flags: %m");
1367
1368 r = sd_netlink_call_async(link->manager->rtnl, req, set_flags_handler, link, 0, NULL);
1369 if (r < 0)
1370 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1371
1372 link_ref(link);
1373
1374 return 0;
1375 }
1376
1377 static int link_set_bridge(Link *link) {
1378 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1379 int r;
1380
1381 assert(link);
1382 assert(link->network);
1383
1384 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1385 if (r < 0)
1386 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1387
1388 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1389 if (r < 0)
1390 return log_link_error_errno(link, r, "Could not set message family: %m");
1391
1392 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1393 if (r < 0)
1394 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1395
1396 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, !link->network->use_bpdu);
1397 if (r < 0)
1398 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1399
1400 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1401 if (r < 0)
1402 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1403
1404 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1405 if (r < 0)
1406 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1407
1408 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, !link->network->allow_port_to_be_root);
1409 if (r < 0)
1410 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1411
1412 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1413 if (r < 0)
1414 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1415
1416 if (link->network->cost != 0) {
1417 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1418 if (r < 0)
1419 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1420 }
1421
1422 r = sd_netlink_message_close_container(req);
1423 if (r < 0)
1424 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1425
1426 r = sd_netlink_call_async(link->manager->rtnl, req, link_set_handler, link, 0, NULL);
1427 if (r < 0)
1428 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1429
1430 link_ref(link);
1431
1432 return r;
1433 }
1434
1435 static int link_lldp_save(Link *link) {
1436 _cleanup_free_ char *temp_path = NULL;
1437 _cleanup_fclose_ FILE *f = NULL;
1438 sd_lldp_neighbor **l = NULL;
1439 int n = 0, r, i;
1440
1441 assert(link);
1442 assert(link->lldp_file);
1443
1444 if (!link->lldp) {
1445 (void) unlink(link->lldp_file);
1446 return 0;
1447 }
1448
1449 r = sd_lldp_get_neighbors(link->lldp, &l);
1450 if (r < 0)
1451 goto finish;
1452 if (r == 0) {
1453 (void) unlink(link->lldp_file);
1454 goto finish;
1455 }
1456
1457 n = r;
1458
1459 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1460 if (r < 0)
1461 goto finish;
1462
1463 fchmod(fileno(f), 0644);
1464
1465 for (i = 0; i < n; i++) {
1466 const void *p;
1467 le64_t u;
1468 size_t sz;
1469
1470 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1471 if (r < 0)
1472 goto finish;
1473
1474 u = htole64(sz);
1475 (void) fwrite(&u, 1, sizeof(u), f);
1476 (void) fwrite(p, 1, sz, f);
1477 }
1478
1479 r = fflush_and_check(f);
1480 if (r < 0)
1481 goto finish;
1482
1483 if (rename(temp_path, link->lldp_file) < 0) {
1484 r = -errno;
1485 goto finish;
1486 }
1487
1488 finish:
1489 if (r < 0) {
1490 (void) unlink(link->lldp_file);
1491 if (temp_path)
1492 (void) unlink(temp_path);
1493
1494 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1495 }
1496
1497 if (l) {
1498 for (i = 0; i < n; i++)
1499 sd_lldp_neighbor_unref(l[i]);
1500 free(l);
1501 }
1502
1503 return r;
1504 }
1505
1506 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1507 Link *link = userdata;
1508 int r;
1509
1510 assert(link);
1511
1512 (void) link_lldp_save(link);
1513
1514 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1515 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1516
1517 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1518
1519 r = link_lldp_emit_start(link);
1520 if (r < 0)
1521 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1522 }
1523 }
1524
1525 static int link_acquire_ipv6_conf(Link *link) {
1526 int r;
1527
1528 assert(link);
1529
1530 if (link_dhcp6_enabled(link)) {
1531 assert(link->dhcp6_client);
1532 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1533
1534 /* start DHCPv6 client in stateless mode */
1535 r = dhcp6_request_address(link, true);
1536 if (r < 0 && r != -EBUSY)
1537 return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m");
1538 else
1539 log_link_debug(link, "Acquiring DHCPv6 lease");
1540 }
1541
1542 if (link_ipv6_accept_ra_enabled(link)) {
1543 assert(link->ndisc);
1544
1545 log_link_debug(link, "Discovering IPv6 routers");
1546
1547 r = sd_ndisc_start(link->ndisc);
1548 if (r < 0 && r != -EBUSY)
1549 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1550 }
1551
1552 return 0;
1553 }
1554
1555 static int link_acquire_ipv4_conf(Link *link) {
1556 int r;
1557
1558 assert(link);
1559 assert(link->network);
1560 assert(link->manager);
1561 assert(link->manager->event);
1562
1563 if (link_ipv4ll_enabled(link)) {
1564 assert(link->ipv4ll);
1565
1566 log_link_debug(link, "Acquiring IPv4 link-local address");
1567
1568 r = sd_ipv4ll_start(link->ipv4ll);
1569 if (r < 0)
1570 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1571 }
1572
1573 if (link_dhcp4_enabled(link)) {
1574 assert(link->dhcp_client);
1575
1576 log_link_debug(link, "Acquiring DHCPv4 lease");
1577
1578 r = sd_dhcp_client_start(link->dhcp_client);
1579 if (r < 0)
1580 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1581 }
1582
1583 return 0;
1584 }
1585
1586 static int link_acquire_conf(Link *link) {
1587 int r;
1588
1589 assert(link);
1590
1591 r = link_acquire_ipv4_conf(link);
1592 if (r < 0)
1593 return r;
1594
1595 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) == 0) {
1596 r = link_acquire_ipv6_conf(link);
1597 if (r < 0)
1598 return r;
1599 }
1600
1601 if (link_lldp_emit_enabled(link)) {
1602 r = link_lldp_emit_start(link);
1603 if (r < 0)
1604 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1605 }
1606
1607 return 0;
1608 }
1609
1610 bool link_has_carrier(Link *link) {
1611 /* see Documentation/networking/operstates.txt in the kernel sources */
1612
1613 if (link->kernel_operstate == IF_OPER_UP)
1614 return true;
1615
1616 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1617 /* operstate may not be implemented, so fall back to flags */
1618 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1619 return true;
1620
1621 return false;
1622 }
1623
1624 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1625 _cleanup_link_unref_ Link *link = userdata;
1626 int r;
1627
1628 assert(link);
1629
1630 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1631 return 1;
1632
1633 r = sd_netlink_message_get_errno(m);
1634 if (r < 0)
1635 /* we warn but don't fail the link, as it may be
1636 brought up later */
1637 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1638
1639 return 1;
1640 }
1641
1642 static int link_up(Link *link) {
1643 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1644 uint8_t ipv6ll_mode;
1645 int r;
1646
1647 assert(link);
1648 assert(link->network);
1649 assert(link->manager);
1650 assert(link->manager->rtnl);
1651
1652 log_link_debug(link, "Bringing link up");
1653
1654 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1655 if (r < 0)
1656 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1657
1658 /* set it free if not enslaved with networkd */
1659 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1660 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1661 if (r < 0)
1662 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1663 }
1664
1665 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1666 if (r < 0)
1667 return log_link_error_errno(link, r, "Could not set link flags: %m");
1668
1669 if (link->network->mac) {
1670 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1671 if (r < 0)
1672 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1673 }
1674
1675 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1676 for this interface, or if it is a bridge slave, then disable IPv6 else enable it. */
1677 (void) link_enable_ipv6(link);
1678
1679 if (link->network->mtu) {
1680 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1681 on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1682 if (link_ipv6_enabled(link) && link->network->mtu < IPV6_MIN_MTU) {
1683
1684 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1685 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1686
1687 link->network->mtu = IPV6_MIN_MTU;
1688 }
1689
1690 r = sd_netlink_message_append_u32(req, IFLA_MTU, link->network->mtu);
1691 if (r < 0)
1692 return log_link_error_errno(link, r, "Could not set MTU: %m");
1693 }
1694
1695 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1696 if (r < 0)
1697 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1698
1699 if (link_ipv6_enabled(link)) {
1700 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
1701 r = sd_netlink_message_open_container(req, AF_INET6);
1702 if (r < 0)
1703 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1704
1705 if (!link_ipv6ll_enabled(link))
1706 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1707 else {
1708 const char *p = NULL;
1709 _cleanup_free_ char *stable_secret = NULL;
1710
1711 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/stable_secret");
1712 r = read_one_line_file(p, &stable_secret);
1713
1714 if (r < 0)
1715 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1716 else
1717 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1718 }
1719 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1720 if (r < 0)
1721 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1722
1723 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
1724 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
1725 if (r < 0)
1726 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
1727 }
1728
1729 r = sd_netlink_message_close_container(req);
1730 if (r < 0)
1731 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1732 }
1733
1734 r = sd_netlink_message_close_container(req);
1735 if (r < 0)
1736 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1737
1738 r = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
1739 if (r < 0)
1740 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1741
1742 link_ref(link);
1743
1744 return 0;
1745 }
1746
1747 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1748 _cleanup_link_unref_ Link *link = userdata;
1749 int r;
1750
1751 assert(link);
1752
1753 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1754 return 1;
1755
1756 r = sd_netlink_message_get_errno(m);
1757 if (r < 0)
1758 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1759
1760 return 1;
1761 }
1762
1763 static int link_down(Link *link) {
1764 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1765 int r;
1766
1767 assert(link);
1768 assert(link->manager);
1769 assert(link->manager->rtnl);
1770
1771 log_link_debug(link, "Bringing link down");
1772
1773 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1774 RTM_SETLINK, link->ifindex);
1775 if (r < 0)
1776 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1777
1778 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1779 if (r < 0)
1780 return log_link_error_errno(link, r, "Could not set link flags: %m");
1781
1782 r = sd_netlink_call_async(link->manager->rtnl, req, link_down_handler, link, 0, NULL);
1783 if (r < 0)
1784 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1785
1786 link_ref(link);
1787
1788 return 0;
1789 }
1790
1791 static int link_up_can(Link *link) {
1792 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1793 int r;
1794
1795 assert(link);
1796
1797 log_link_debug(link, "Bringing CAN link up");
1798
1799 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1800 if (r < 0)
1801 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1802
1803 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1804 if (r < 0)
1805 return log_link_error_errno(link, r, "Could not set link flags: %m");
1806
1807 r = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
1808 if (r < 0)
1809 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1810
1811 link_ref(link);
1812
1813 return 0;
1814 }
1815
1816 static int link_handle_bound_to_list(Link *link) {
1817 Link *l;
1818 Iterator i;
1819 int r;
1820 bool required_up = false;
1821 bool link_is_up = false;
1822
1823 assert(link);
1824
1825 if (hashmap_isempty(link->bound_to_links))
1826 return 0;
1827
1828 if (link->flags & IFF_UP)
1829 link_is_up = true;
1830
1831 HASHMAP_FOREACH (l, link->bound_to_links, i)
1832 if (link_has_carrier(l)) {
1833 required_up = true;
1834 break;
1835 }
1836
1837 if (!required_up && link_is_up) {
1838 r = link_down(link);
1839 if (r < 0)
1840 return r;
1841 } else if (required_up && !link_is_up) {
1842 r = link_up(link);
1843 if (r < 0)
1844 return r;
1845 }
1846
1847 return 0;
1848 }
1849
1850 static int link_handle_bound_by_list(Link *link) {
1851 Iterator i;
1852 Link *l;
1853 int r;
1854
1855 assert(link);
1856
1857 if (hashmap_isempty(link->bound_by_links))
1858 return 0;
1859
1860 HASHMAP_FOREACH (l, link->bound_by_links, i) {
1861 r = link_handle_bound_to_list(l);
1862 if (r < 0)
1863 return r;
1864 }
1865
1866 return 0;
1867 }
1868
1869 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1870 int r;
1871
1872 assert(link);
1873 assert(carrier);
1874
1875 if (link == carrier)
1876 return 0;
1877
1878 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1879 return 0;
1880
1881 r = hashmap_ensure_allocated(h, NULL);
1882 if (r < 0)
1883 return r;
1884
1885 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1886 if (r < 0)
1887 return r;
1888
1889 return 0;
1890 }
1891
1892 static int link_new_bound_by_list(Link *link) {
1893 Manager *m;
1894 Link *carrier;
1895 Iterator i;
1896 int r;
1897 bool list_updated = false;
1898
1899 assert(link);
1900 assert(link->manager);
1901
1902 m = link->manager;
1903
1904 HASHMAP_FOREACH(carrier, m->links, i) {
1905 if (!carrier->network)
1906 continue;
1907
1908 if (strv_isempty(carrier->network->bind_carrier))
1909 continue;
1910
1911 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
1912 r = link_put_carrier(link, carrier, &link->bound_by_links);
1913 if (r < 0)
1914 return r;
1915
1916 list_updated = true;
1917 }
1918 }
1919
1920 if (list_updated)
1921 link_dirty(link);
1922
1923 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
1924 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1925 if (r < 0)
1926 return r;
1927
1928 link_dirty(carrier);
1929 }
1930
1931 return 0;
1932 }
1933
1934 static int link_new_bound_to_list(Link *link) {
1935 Manager *m;
1936 Link *carrier;
1937 Iterator i;
1938 int r;
1939 bool list_updated = false;
1940
1941 assert(link);
1942 assert(link->manager);
1943
1944 if (!link->network)
1945 return 0;
1946
1947 if (strv_isempty(link->network->bind_carrier))
1948 return 0;
1949
1950 m = link->manager;
1951
1952 HASHMAP_FOREACH (carrier, m->links, i) {
1953 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
1954 r = link_put_carrier(link, carrier, &link->bound_to_links);
1955 if (r < 0)
1956 return r;
1957
1958 list_updated = true;
1959 }
1960 }
1961
1962 if (list_updated)
1963 link_dirty(link);
1964
1965 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
1966 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
1967 if (r < 0)
1968 return r;
1969
1970 link_dirty(carrier);
1971 }
1972
1973 return 0;
1974 }
1975
1976 static int link_new_carrier_maps(Link *link) {
1977 int r;
1978
1979 r = link_new_bound_by_list(link);
1980 if (r < 0)
1981 return r;
1982
1983 r = link_handle_bound_by_list(link);
1984 if (r < 0)
1985 return r;
1986
1987 r = link_new_bound_to_list(link);
1988 if (r < 0)
1989 return r;
1990
1991 r = link_handle_bound_to_list(link);
1992 if (r < 0)
1993 return r;
1994
1995 return 0;
1996 }
1997
1998 static void link_free_bound_to_list(Link *link) {
1999 Link *bound_to;
2000 Iterator i;
2001
2002 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2003 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2004
2005 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2006 link_dirty(bound_to);
2007 }
2008
2009 return;
2010 }
2011
2012 static void link_free_bound_by_list(Link *link) {
2013 Link *bound_by;
2014 Iterator i;
2015
2016 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2017 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2018
2019 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2020 link_dirty(bound_by);
2021 link_handle_bound_to_list(bound_by);
2022 }
2023 }
2024
2025 return;
2026 }
2027
2028 static void link_free_carrier_maps(Link *link) {
2029 bool list_updated = false;
2030
2031 assert(link);
2032
2033 if (!hashmap_isempty(link->bound_to_links)) {
2034 link_free_bound_to_list(link);
2035 list_updated = true;
2036 }
2037
2038 if (!hashmap_isempty(link->bound_by_links)) {
2039 link_free_bound_by_list(link);
2040 list_updated = true;
2041 }
2042
2043 if (list_updated)
2044 link_dirty(link);
2045
2046 return;
2047 }
2048
2049 void link_drop(Link *link) {
2050 if (!link || link->state == LINK_STATE_LINGER)
2051 return;
2052
2053 link_set_state(link, LINK_STATE_LINGER);
2054
2055 link_free_carrier_maps(link);
2056
2057 log_link_debug(link, "Link removed");
2058
2059 (void)unlink(link->state_file);
2060 link_unref(link);
2061
2062 return;
2063 }
2064
2065 static int link_joined(Link *link) {
2066 int r;
2067
2068 assert(link);
2069 assert(link->network);
2070
2071 if (!hashmap_isempty(link->bound_to_links)) {
2072 r = link_handle_bound_to_list(link);
2073 if (r < 0)
2074 return r;
2075 } else if (!(link->flags & IFF_UP)) {
2076 r = link_up(link);
2077 if (r < 0) {
2078 link_enter_failed(link);
2079 return r;
2080 }
2081 }
2082
2083 if (link->network->bridge) {
2084 r = link_set_bridge(link);
2085 if (r < 0)
2086 log_link_error_errno(link, r, "Could not set bridge message: %m");
2087 }
2088
2089 if (link->network->use_br_vlan &&
2090 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2091 r = link_set_bridge_vlan(link);
2092 if (r < 0)
2093 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2094 }
2095
2096 return link_enter_set_addresses(link);
2097 }
2098
2099 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
2100 _cleanup_link_unref_ Link *link = userdata;
2101 int r;
2102
2103 assert(link);
2104 assert(link->network);
2105
2106 link->enslaving--;
2107
2108 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2109 return 1;
2110
2111 r = sd_netlink_message_get_errno(m);
2112 if (r < 0 && r != -EEXIST) {
2113 log_link_error_errno(link, r, "Could not join netdev: %m");
2114 link_enter_failed(link);
2115 return 1;
2116 } else
2117 log_link_debug(link, "Joined netdev");
2118
2119 if (link->enslaving <= 0)
2120 link_joined(link);
2121
2122 return 1;
2123 }
2124
2125 static int link_enter_join_netdev(Link *link) {
2126 NetDev *netdev;
2127 Iterator i;
2128 int r;
2129
2130 assert(link);
2131 assert(link->network);
2132 assert(link->state == LINK_STATE_PENDING);
2133
2134 link_set_state(link, LINK_STATE_ENSLAVING);
2135
2136 link_dirty(link);
2137
2138 if (!link->network->bridge &&
2139 !link->network->bond &&
2140 !link->network->vrf &&
2141 hashmap_isempty(link->network->stacked_netdevs))
2142 return link_joined(link);
2143
2144 if (link->network->bond) {
2145 log_struct(LOG_DEBUG,
2146 LOG_LINK_INTERFACE(link),
2147 LOG_NETDEV_INTERFACE(link->network->bond),
2148 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname),
2149 NULL);
2150
2151 r = netdev_join(link->network->bond, link, netdev_join_handler);
2152 if (r < 0) {
2153 log_struct_errno(LOG_WARNING, r,
2154 LOG_LINK_INTERFACE(link),
2155 LOG_NETDEV_INTERFACE(link->network->bond),
2156 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname),
2157 NULL);
2158
2159 link_enter_failed(link);
2160 return r;
2161 }
2162
2163 link->enslaving++;
2164 }
2165
2166 if (link->network->bridge) {
2167 log_struct(LOG_DEBUG,
2168 LOG_LINK_INTERFACE(link),
2169 LOG_NETDEV_INTERFACE(link->network->bridge),
2170 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname),
2171 NULL);
2172
2173 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2174 if (r < 0) {
2175 log_struct_errno(LOG_WARNING, r,
2176 LOG_LINK_INTERFACE(link),
2177 LOG_NETDEV_INTERFACE(link->network->bridge),
2178 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname),
2179 NULL),
2180 link_enter_failed(link);
2181 return r;
2182 }
2183
2184 link->enslaving++;
2185 }
2186
2187 if (link->network->vrf) {
2188 log_struct(LOG_DEBUG,
2189 LOG_LINK_INTERFACE(link),
2190 LOG_NETDEV_INTERFACE(link->network->vrf),
2191 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname),
2192 NULL);
2193 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2194 if (r < 0) {
2195 log_struct_errno(LOG_WARNING, r,
2196 LOG_LINK_INTERFACE(link),
2197 LOG_NETDEV_INTERFACE(link->network->vrf),
2198 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname),
2199 NULL);
2200 link_enter_failed(link);
2201 return r;
2202 }
2203
2204 link->enslaving++;
2205 }
2206
2207 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2208
2209 log_struct(LOG_DEBUG,
2210 LOG_LINK_INTERFACE(link),
2211 LOG_NETDEV_INTERFACE(netdev),
2212 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname),
2213 NULL);
2214
2215 r = netdev_join(netdev, link, netdev_join_handler);
2216 if (r < 0) {
2217 log_struct_errno(LOG_WARNING, r,
2218 LOG_LINK_INTERFACE(link),
2219 LOG_NETDEV_INTERFACE(netdev),
2220 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname),
2221 NULL);
2222 link_enter_failed(link);
2223 return r;
2224 }
2225
2226 link->enslaving++;
2227 }
2228
2229 return 0;
2230 }
2231
2232 static int link_set_ipv4_forward(Link *link) {
2233 int r;
2234
2235 if (!link_ipv4_forward_enabled(link))
2236 return 0;
2237
2238 /* We propagate the forwarding flag from one interface to the
2239 * global setting one way. This means: as long as at least one
2240 * interface was configured at any time that had IP forwarding
2241 * enabled the setting will stay on for good. We do this
2242 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2243 * somewhat in sync (see below). */
2244
2245 r = write_string_file("/proc/sys/net/ipv4/ip_forward", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2246 if (r < 0)
2247 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2248
2249 return 0;
2250 }
2251
2252 static int link_set_ipv6_forward(Link *link) {
2253 int r;
2254
2255 if (!link_ipv6_forward_enabled(link))
2256 return 0;
2257
2258 /* On Linux, the IPv6 stack does not know a per-interface
2259 * packet forwarding setting: either packet forwarding is on
2260 * for all, or off for all. We hence don't bother with a
2261 * per-interface setting, but simply propagate the interface
2262 * flag, if it is set, to the global flag, one-way. Note that
2263 * while IPv4 would allow a per-interface flag, we expose the
2264 * same behaviour there and also propagate the setting from
2265 * one to all, to keep things simple (see above). */
2266
2267 r = write_string_file("/proc/sys/net/ipv6/conf/all/forwarding", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2268 if (r < 0)
2269 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2270
2271 return 0;
2272 }
2273
2274 static int link_set_ipv6_privacy_extensions(Link *link) {
2275 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2276 IPv6PrivacyExtensions s;
2277 const char *p = NULL;
2278 int r;
2279
2280 s = link_ipv6_privacy_extensions(link);
2281 if (s < 0)
2282 return 0;
2283
2284 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/use_tempaddr");
2285 xsprintf(buf, "%u", (unsigned) link->network->ipv6_privacy_extensions);
2286
2287 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2288 if (r < 0)
2289 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2290
2291 return 0;
2292 }
2293
2294 static int link_set_ipv6_accept_ra(Link *link) {
2295 const char *p = NULL;
2296 int r;
2297
2298 /* Make this a NOP if IPv6 is not available */
2299 if (!socket_ipv6_is_supported())
2300 return 0;
2301
2302 if (link->flags & IFF_LOOPBACK)
2303 return 0;
2304
2305 if (!link->network)
2306 return 0;
2307
2308 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/accept_ra");
2309
2310 /* We handle router advertisements ourselves, tell the kernel to GTFO */
2311 r = write_string_file(p, "0", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2312 if (r < 0)
2313 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2314
2315 return 0;
2316 }
2317
2318 static int link_set_ipv6_dad_transmits(Link *link) {
2319 char buf[DECIMAL_STR_MAX(int) + 1];
2320 const char *p = NULL;
2321 int r;
2322
2323 /* Make this a NOP if IPv6 is not available */
2324 if (!socket_ipv6_is_supported())
2325 return 0;
2326
2327 if (link->flags & IFF_LOOPBACK)
2328 return 0;
2329
2330 if (!link->network)
2331 return 0;
2332
2333 if (link->network->ipv6_dad_transmits < 0)
2334 return 0;
2335
2336 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/dad_transmits");
2337 xsprintf(buf, "%i", link->network->ipv6_dad_transmits);
2338
2339 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2340 if (r < 0)
2341 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2342
2343 return 0;
2344 }
2345
2346 static int link_set_ipv6_hop_limit(Link *link) {
2347 char buf[DECIMAL_STR_MAX(int) + 1];
2348 const char *p = NULL;
2349 int r;
2350
2351 /* Make this a NOP if IPv6 is not available */
2352 if (!socket_ipv6_is_supported())
2353 return 0;
2354
2355 if (link->flags & IFF_LOOPBACK)
2356 return 0;
2357
2358 if (!link->network)
2359 return 0;
2360
2361 if (link->network->ipv6_hop_limit < 0)
2362 return 0;
2363
2364 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/hop_limit");
2365 xsprintf(buf, "%i", link->network->ipv6_hop_limit);
2366
2367 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2368 if (r < 0)
2369 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2370
2371 return 0;
2372 }
2373
2374 static int link_drop_foreign_config(Link *link) {
2375 Address *address;
2376 Route *route;
2377 Iterator i;
2378 int r;
2379
2380 SET_FOREACH(address, link->addresses_foreign, i) {
2381 /* we consider IPv6LL addresses to be managed by the kernel */
2382 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2383 continue;
2384
2385 r = address_remove(address, link, link_address_remove_handler);
2386 if (r < 0)
2387 return r;
2388 }
2389
2390 SET_FOREACH(route, link->routes_foreign, i) {
2391 /* do not touch routes managed by the kernel */
2392 if (route->protocol == RTPROT_KERNEL)
2393 continue;
2394
2395 r = route_remove(route, link, link_route_remove_handler);
2396 if (r < 0)
2397 return r;
2398 }
2399
2400 return 0;
2401 }
2402
2403 static int link_drop_config(Link *link) {
2404 Address *address;
2405 Route *route;
2406 Iterator i;
2407 int r;
2408
2409 SET_FOREACH(address, link->addresses, i) {
2410 /* we consider IPv6LL addresses to be managed by the kernel */
2411 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2412 continue;
2413
2414 r = address_remove(address, link, link_address_remove_handler);
2415 if (r < 0)
2416 return r;
2417 }
2418
2419 SET_FOREACH(route, link->routes, i) {
2420 /* do not touch routes managed by the kernel */
2421 if (route->protocol == RTPROT_KERNEL)
2422 continue;
2423
2424 r = route_remove(route, link, link_route_remove_handler);
2425 if (r < 0)
2426 return r;
2427 }
2428
2429 ndisc_flush(link);
2430
2431 return 0;
2432 }
2433
2434 static int link_update_lldp(Link *link) {
2435 int r;
2436
2437 assert(link);
2438
2439 if (!link->lldp)
2440 return 0;
2441
2442 if (link->flags & IFF_UP) {
2443 r = sd_lldp_start(link->lldp);
2444 if (r > 0)
2445 log_link_debug(link, "Started LLDP.");
2446 } else {
2447 r = sd_lldp_stop(link->lldp);
2448 if (r > 0)
2449 log_link_debug(link, "Stopped LLDP.");
2450 }
2451
2452 return r;
2453 }
2454
2455 static int link_configure(Link *link) {
2456 int r;
2457
2458 assert(link);
2459 assert(link->network);
2460 assert(link->state == LINK_STATE_PENDING);
2461
2462 if (streq_ptr(link->kind, "vcan")) {
2463
2464 if (!(link->flags & IFF_UP)) {
2465 r = link_up_can(link);
2466 if (r < 0) {
2467 link_enter_failed(link);
2468 return r;
2469 }
2470 }
2471
2472 return 0;
2473 }
2474
2475 /* Drop foreign config, but ignore loopback or critical devices.
2476 * We do not want to remove loopback address or addresses used for root NFS. */
2477 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2478 r = link_drop_foreign_config(link);
2479 if (r < 0)
2480 return r;
2481 }
2482
2483 r = link_set_proxy_arp(link);
2484 if (r < 0)
2485 return r;
2486
2487 r = link_set_ipv4_forward(link);
2488 if (r < 0)
2489 return r;
2490
2491 r = link_set_ipv6_forward(link);
2492 if (r < 0)
2493 return r;
2494
2495 r = link_set_ipv6_privacy_extensions(link);
2496 if (r < 0)
2497 return r;
2498
2499 r = link_set_ipv6_accept_ra(link);
2500 if (r < 0)
2501 return r;
2502
2503 r = link_set_ipv6_dad_transmits(link);
2504 if (r < 0)
2505 return r;
2506
2507 r = link_set_ipv6_hop_limit(link);
2508 if (r < 0)
2509 return r;
2510
2511 r = link_set_flags(link);
2512 if (r < 0)
2513 return r;
2514
2515 if (link_ipv4ll_enabled(link)) {
2516 r = ipv4ll_configure(link);
2517 if (r < 0)
2518 return r;
2519 }
2520
2521 if (link_dhcp4_enabled(link)) {
2522 r = dhcp4_configure(link);
2523 if (r < 0)
2524 return r;
2525 }
2526
2527 if (link_dhcp4_server_enabled(link)) {
2528 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2529 if (r < 0)
2530 return r;
2531
2532 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2533 if (r < 0)
2534 return r;
2535 }
2536
2537 if (link_dhcp6_enabled(link) ||
2538 link_ipv6_accept_ra_enabled(link)) {
2539 r = dhcp6_configure(link);
2540 if (r < 0)
2541 return r;
2542 }
2543
2544 if (link_ipv6_accept_ra_enabled(link)) {
2545 r = ndisc_configure(link);
2546 if (r < 0)
2547 return r;
2548 }
2549
2550 if (link_lldp_rx_enabled(link)) {
2551 r = sd_lldp_new(&link->lldp);
2552 if (r < 0)
2553 return r;
2554
2555 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
2556 if (r < 0)
2557 return r;
2558
2559 r = sd_lldp_match_capabilities(link->lldp,
2560 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
2561 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
2562 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
2563 if (r < 0)
2564 return r;
2565
2566 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
2567 if (r < 0)
2568 return r;
2569
2570 r = sd_lldp_attach_event(link->lldp, NULL, 0);
2571 if (r < 0)
2572 return r;
2573
2574 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
2575 if (r < 0)
2576 return r;
2577
2578 r = link_update_lldp(link);
2579 if (r < 0)
2580 return r;
2581 }
2582
2583 if (link_has_carrier(link)) {
2584 r = link_acquire_conf(link);
2585 if (r < 0)
2586 return r;
2587 }
2588
2589 return link_enter_join_netdev(link);
2590 }
2591
2592 static int link_initialized_and_synced(sd_netlink *rtnl, sd_netlink_message *m,
2593 void *userdata) {
2594 _cleanup_link_unref_ Link *link = userdata;
2595 Network *network;
2596 int r;
2597
2598 assert(link);
2599 assert(link->ifname);
2600 assert(link->manager);
2601
2602 if (link->state != LINK_STATE_PENDING)
2603 return 1;
2604
2605 log_link_debug(link, "Link state is up-to-date");
2606
2607 r = link_new_bound_by_list(link);
2608 if (r < 0)
2609 return r;
2610
2611 r = link_handle_bound_by_list(link);
2612 if (r < 0)
2613 return r;
2614
2615 if (!link->network) {
2616 r = network_get(link->manager, link->udev_device, link->ifname,
2617 &link->mac, &network);
2618 if (r == -ENOENT) {
2619 link_enter_unmanaged(link);
2620 return 1;
2621 } else if (r < 0)
2622 return r;
2623
2624 if (link->flags & IFF_LOOPBACK) {
2625 if (network->link_local != ADDRESS_FAMILY_NO)
2626 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2627
2628 if (network->dhcp != ADDRESS_FAMILY_NO)
2629 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2630
2631 if (network->dhcp_server)
2632 log_link_debug(link, "Ignoring DHCP server for loopback link");
2633 }
2634
2635 r = network_apply(network, link);
2636 if (r < 0)
2637 return r;
2638 }
2639
2640 r = link_new_bound_to_list(link);
2641 if (r < 0)
2642 return r;
2643
2644 r = link_configure(link);
2645 if (r < 0)
2646 return r;
2647
2648 return 1;
2649 }
2650
2651 int link_initialized(Link *link, struct udev_device *device) {
2652 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2653 int r;
2654
2655 assert(link);
2656 assert(link->manager);
2657 assert(link->manager->rtnl);
2658 assert(device);
2659
2660 if (link->state != LINK_STATE_PENDING)
2661 return 0;
2662
2663 if (link->udev_device)
2664 return 0;
2665
2666 log_link_debug(link, "udev initialized link");
2667
2668 link->udev_device = udev_device_ref(device);
2669
2670 /* udev has initialized the link, but we don't know if we have yet
2671 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2672 * when it returns we know that the pending NEWLINKs have already been
2673 * processed and that we are up-to-date */
2674
2675 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2676 link->ifindex);
2677 if (r < 0)
2678 return r;
2679
2680 r = sd_netlink_call_async(link->manager->rtnl, req,
2681 link_initialized_and_synced, link, 0, NULL);
2682 if (r < 0)
2683 return r;
2684
2685 link_ref(link);
2686
2687 return 0;
2688 }
2689
2690 static int link_load(Link *link) {
2691 _cleanup_free_ char *network_file = NULL,
2692 *addresses = NULL,
2693 *routes = NULL,
2694 *dhcp4_address = NULL,
2695 *ipv4ll_address = NULL;
2696 union in_addr_union address;
2697 union in_addr_union route_dst;
2698 const char *p;
2699 int r;
2700
2701 assert(link);
2702
2703 r = parse_env_file(link->state_file, NEWLINE,
2704 "NETWORK_FILE", &network_file,
2705 "ADDRESSES", &addresses,
2706 "ROUTES", &routes,
2707 "DHCP4_ADDRESS", &dhcp4_address,
2708 "IPV4LL_ADDRESS", &ipv4ll_address,
2709 NULL);
2710 if (r < 0 && r != -ENOENT)
2711 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
2712
2713 if (network_file) {
2714 Network *network;
2715 char *suffix;
2716
2717 /* drop suffix */
2718 suffix = strrchr(network_file, '.');
2719 if (!suffix) {
2720 log_link_debug(link, "Failed to get network name from %s", network_file);
2721 goto network_file_fail;
2722 }
2723 *suffix = '\0';
2724
2725 r = network_get_by_name(link->manager, basename(network_file), &network);
2726 if (r < 0) {
2727 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
2728 goto network_file_fail;
2729 }
2730
2731 r = network_apply(network, link);
2732 if (r < 0)
2733 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
2734 }
2735
2736 network_file_fail:
2737
2738 if (addresses) {
2739 p = addresses;
2740
2741 for (;;) {
2742 _cleanup_free_ char *address_str = NULL;
2743 char *prefixlen_str;
2744 int family;
2745 unsigned char prefixlen;
2746
2747 r = extract_first_word(&p, &address_str, NULL, 0);
2748 if (r < 0) {
2749 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
2750 continue;
2751 }
2752 if (r == 0)
2753 break;
2754
2755 prefixlen_str = strchr(address_str, '/');
2756 if (!prefixlen_str) {
2757 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
2758 continue;
2759 }
2760
2761 *prefixlen_str++ = '\0';
2762
2763 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
2764 if (r != 1) {
2765 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
2766 continue;
2767 }
2768
2769 r = in_addr_from_string_auto(address_str, &family, &address);
2770 if (r < 0) {
2771 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
2772 continue;
2773 }
2774
2775 r = address_add(link, family, &address, prefixlen, NULL);
2776 if (r < 0)
2777 return log_link_error_errno(link, r, "Failed to add address: %m");
2778 }
2779 }
2780
2781 if (routes) {
2782 p = routes;
2783
2784 for (;;) {
2785 Route *route;
2786 _cleanup_free_ char *route_str = NULL;
2787 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
2788 usec_t lifetime;
2789 char *prefixlen_str;
2790 int family;
2791 unsigned char prefixlen, tos, table;
2792 uint32_t priority;
2793
2794 r = extract_first_word(&p, &route_str, NULL, 0);
2795 if (r < 0) {
2796 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
2797 continue;
2798 }
2799 if (r == 0)
2800 break;
2801
2802 prefixlen_str = strchr(route_str, '/');
2803 if (!prefixlen_str) {
2804 log_link_debug(link, "Failed to parse route %s", route_str);
2805 continue;
2806 }
2807
2808 *prefixlen_str++ = '\0';
2809
2810 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
2811 if (r != 5) {
2812 log_link_debug(link,
2813 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
2814 prefixlen_str);
2815 continue;
2816 }
2817
2818 r = in_addr_from_string_auto(route_str, &family, &route_dst);
2819 if (r < 0) {
2820 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
2821 continue;
2822 }
2823
2824 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
2825 if (r < 0)
2826 return log_link_error_errno(link, r, "Failed to add route: %m");
2827
2828 if (lifetime != USEC_INFINITY) {
2829 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
2830 0, route_expire_handler, route);
2831 if (r < 0)
2832 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
2833 }
2834
2835 route->lifetime = lifetime;
2836 sd_event_source_unref(route->expire);
2837 route->expire = expire;
2838 expire = NULL;
2839 }
2840 }
2841
2842 if (dhcp4_address) {
2843 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
2844 if (r < 0) {
2845 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
2846 goto dhcp4_address_fail;
2847 }
2848
2849 r = sd_dhcp_client_new(&link->dhcp_client);
2850 if (r < 0)
2851 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
2852
2853 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
2854 if (r < 0)
2855 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
2856 }
2857
2858 dhcp4_address_fail:
2859
2860 if (ipv4ll_address) {
2861 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
2862 if (r < 0) {
2863 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
2864 goto ipv4ll_address_fail;
2865 }
2866
2867 r = sd_ipv4ll_new(&link->ipv4ll);
2868 if (r < 0)
2869 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
2870
2871 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
2872 if (r < 0)
2873 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
2874 }
2875
2876 ipv4ll_address_fail:
2877
2878 return 0;
2879 }
2880
2881 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
2882 Link *link;
2883 _cleanup_udev_device_unref_ struct udev_device *device = NULL;
2884 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
2885 int r;
2886
2887 assert(m);
2888 assert(m->rtnl);
2889 assert(message);
2890 assert(ret);
2891
2892 r = link_new(m, message, ret);
2893 if (r < 0)
2894 return r;
2895
2896 link = *ret;
2897
2898 log_link_debug(link, "Link %d added", link->ifindex);
2899
2900 r = link_load(link);
2901 if (r < 0)
2902 return r;
2903
2904 if (detect_container() <= 0) {
2905 /* not in a container, udev will be around */
2906 sprintf(ifindex_str, "n%d", link->ifindex);
2907 device = udev_device_new_from_device_id(m->udev, ifindex_str);
2908 if (!device) {
2909 r = log_link_warning_errno(link, errno, "Could not find udev device: %m");
2910 goto failed;
2911 }
2912
2913 if (udev_device_get_is_initialized(device) <= 0) {
2914 /* not yet ready */
2915 log_link_debug(link, "link pending udev initialization...");
2916 return 0;
2917 }
2918
2919 r = link_initialized(link, device);
2920 if (r < 0)
2921 goto failed;
2922 } else {
2923 /* we are calling a callback directly, so must take a ref */
2924 link_ref(link);
2925
2926 r = link_initialized_and_synced(m->rtnl, NULL, link);
2927 if (r < 0)
2928 goto failed;
2929 }
2930
2931 return 0;
2932 failed:
2933 link_enter_failed(link);
2934 return r;
2935 }
2936
2937 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
2938 int r;
2939
2940 assert(link);
2941
2942 log_link_info(link, "Gained IPv6LL");
2943
2944 link->ipv6ll_address = *address;
2945 link_check_ready(link);
2946
2947 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
2948 r = link_acquire_ipv6_conf(link);
2949 if (r < 0) {
2950 link_enter_failed(link);
2951 return r;
2952 }
2953 }
2954
2955 return 0;
2956 }
2957
2958 static int link_carrier_gained(Link *link) {
2959 int r;
2960
2961 assert(link);
2962
2963 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
2964 r = link_acquire_conf(link);
2965 if (r < 0) {
2966 link_enter_failed(link);
2967 return r;
2968 }
2969
2970 r = link_enter_set_addresses(link);
2971 if (r < 0)
2972 return r;
2973 }
2974
2975 r = link_handle_bound_by_list(link);
2976 if (r < 0)
2977 return r;
2978
2979 return 0;
2980 }
2981
2982 static int link_carrier_lost(Link *link) {
2983 int r;
2984
2985 assert(link);
2986
2987 r = link_stop_clients(link);
2988 if (r < 0) {
2989 link_enter_failed(link);
2990 return r;
2991 }
2992
2993 r = link_drop_config(link);
2994 if (r < 0)
2995 return r;
2996
2997 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
2998 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
2999 r = link_drop_foreign_config(link);
3000 if (r < 0)
3001 return r;
3002 }
3003
3004 r = link_handle_bound_by_list(link);
3005 if (r < 0)
3006 return r;
3007
3008 return 0;
3009 }
3010
3011 int link_carrier_reset(Link *link) {
3012 int r;
3013
3014 assert(link);
3015
3016 if (link_has_carrier(link)) {
3017 r = link_carrier_lost(link);
3018 if (r < 0)
3019 return r;
3020
3021 r = link_carrier_gained(link);
3022 if (r < 0)
3023 return r;
3024
3025 log_link_info(link, "Reset carrier");
3026 }
3027
3028 return 0;
3029 }
3030
3031 int link_update(Link *link, sd_netlink_message *m) {
3032 struct ether_addr mac;
3033 const char *ifname;
3034 uint32_t mtu;
3035 bool had_carrier, carrier_gained, carrier_lost;
3036 int r;
3037
3038 assert(link);
3039 assert(link->ifname);
3040 assert(m);
3041
3042 if (link->state == LINK_STATE_LINGER) {
3043 link_ref(link);
3044 log_link_info(link, "Link readded");
3045 link_set_state(link, LINK_STATE_ENSLAVING);
3046
3047 r = link_new_carrier_maps(link);
3048 if (r < 0)
3049 return r;
3050 }
3051
3052 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3053 if (r >= 0 && !streq(ifname, link->ifname)) {
3054 log_link_info(link, "Renamed to %s", ifname);
3055
3056 link_free_carrier_maps(link);
3057
3058 r = free_and_strdup(&link->ifname, ifname);
3059 if (r < 0)
3060 return r;
3061
3062 r = link_new_carrier_maps(link);
3063 if (r < 0)
3064 return r;
3065 }
3066
3067 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3068 if (r >= 0 && mtu > 0) {
3069 link->mtu = mtu;
3070 if (!link->original_mtu) {
3071 link->original_mtu = mtu;
3072 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3073 }
3074
3075 if (link->dhcp_client) {
3076 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3077 link->mtu);
3078 if (r < 0) {
3079 log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3080 return r;
3081 }
3082 }
3083 }
3084
3085 /* The kernel may broadcast NEWLINK messages without the MAC address
3086 set, simply ignore them. */
3087 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3088 if (r >= 0) {
3089 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3090 ETH_ALEN)) {
3091
3092 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3093 ETH_ALEN);
3094
3095 log_link_debug(link, "MAC address: "
3096 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3097 mac.ether_addr_octet[0],
3098 mac.ether_addr_octet[1],
3099 mac.ether_addr_octet[2],
3100 mac.ether_addr_octet[3],
3101 mac.ether_addr_octet[4],
3102 mac.ether_addr_octet[5]);
3103
3104 if (link->ipv4ll) {
3105 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3106 if (r < 0)
3107 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3108 }
3109
3110 if (link->dhcp_client) {
3111 const DUID *duid = link_duid(link);
3112
3113 r = sd_dhcp_client_set_mac(link->dhcp_client,
3114 (const uint8_t *) &link->mac,
3115 sizeof (link->mac),
3116 ARPHRD_ETHER);
3117 if (r < 0)
3118 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3119
3120 r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
3121 link->network->iaid,
3122 duid->type,
3123 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3124 duid->raw_data_len);
3125 if (r < 0)
3126 return log_link_warning_errno(link, r, "Could not update DUID/IAID in DHCP client: %m");
3127 }
3128
3129 if (link->dhcp6_client) {
3130 const DUID* duid = link_duid(link);
3131
3132 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3133 (const uint8_t *) &link->mac,
3134 sizeof (link->mac),
3135 ARPHRD_ETHER);
3136 if (r < 0)
3137 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3138
3139 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3140 link->network->iaid);
3141 if (r < 0)
3142 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3143
3144 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3145 duid->type,
3146 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3147 duid->raw_data_len);
3148 if (r < 0)
3149 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3150 }
3151 }
3152 }
3153
3154 had_carrier = link_has_carrier(link);
3155
3156 r = link_update_flags(link, m);
3157 if (r < 0)
3158 return r;
3159
3160 r = link_update_lldp(link);
3161 if (r < 0)
3162 return r;
3163
3164 carrier_gained = !had_carrier && link_has_carrier(link);
3165 carrier_lost = had_carrier && !link_has_carrier(link);
3166
3167 if (carrier_gained) {
3168 log_link_info(link, "Gained carrier");
3169
3170 r = link_carrier_gained(link);
3171 if (r < 0)
3172 return r;
3173 } else if (carrier_lost) {
3174 log_link_info(link, "Lost carrier");
3175
3176 r = link_carrier_lost(link);
3177 if (r < 0)
3178 return r;
3179 }
3180
3181 return 0;
3182 }
3183
3184 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3185 bool space = false;
3186 Iterator i;
3187 Link *link;
3188
3189 assert(f);
3190 assert(prefix);
3191
3192 if (hashmap_isempty(h))
3193 return;
3194
3195 fputs(prefix, f);
3196 HASHMAP_FOREACH(link, h, i) {
3197 if (space)
3198 fputc(' ', f);
3199
3200 fprintf(f, "%i", link->ifindex);
3201 space = true;
3202 }
3203
3204 fputc('\n', f);
3205 }
3206
3207 int link_save(Link *link) {
3208 _cleanup_free_ char *temp_path = NULL;
3209 _cleanup_fclose_ FILE *f = NULL;
3210 const char *admin_state, *oper_state;
3211 Address *a;
3212 Route *route;
3213 Iterator i;
3214 int r;
3215
3216 assert(link);
3217 assert(link->state_file);
3218 assert(link->lease_file);
3219 assert(link->manager);
3220
3221 if (link->state == LINK_STATE_LINGER) {
3222 unlink(link->state_file);
3223 return 0;
3224 }
3225
3226 link_lldp_save(link);
3227
3228 admin_state = link_state_to_string(link->state);
3229 assert(admin_state);
3230
3231 oper_state = link_operstate_to_string(link->operstate);
3232 assert(oper_state);
3233
3234 r = fopen_temporary(link->state_file, &f, &temp_path);
3235 if (r < 0)
3236 goto fail;
3237
3238 fchmod(fileno(f), 0644);
3239
3240 fprintf(f,
3241 "# This is private data. Do not parse.\n"
3242 "ADMIN_STATE=%s\n"
3243 "OPER_STATE=%s\n",
3244 admin_state, oper_state);
3245
3246 if (link->network) {
3247 bool space;
3248 sd_dhcp6_lease *dhcp6_lease = NULL;
3249 const char *dhcp_domainname = NULL;
3250 char **dhcp6_domains = NULL;
3251
3252 if (link->dhcp6_client) {
3253 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3254 if (r < 0 && r != -ENOMSG)
3255 log_link_debug(link, "No DHCPv6 lease");
3256 }
3257
3258 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3259
3260 fputs("DNS=", f);
3261 space = false;
3262 fputstrv(f, link->network->dns, NULL, &space);
3263
3264 if (link->network->dhcp_use_dns &&
3265 link->dhcp_lease) {
3266 const struct in_addr *addresses;
3267
3268 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3269 if (r > 0) {
3270 if (space)
3271 fputc(' ', f);
3272 serialize_in_addrs(f, addresses, r);
3273 space = true;
3274 }
3275 }
3276
3277 if (link->network->dhcp_use_dns && dhcp6_lease) {
3278 struct in6_addr *in6_addrs;
3279
3280 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3281 if (r > 0) {
3282 if (space)
3283 fputc(' ', f);
3284 serialize_in6_addrs(f, in6_addrs, r);
3285 space = true;
3286 }
3287 }
3288
3289 /* Make sure to flush out old entries before we use the NDISC data */
3290 ndisc_vacuum(link);
3291
3292 if (link->network->dhcp_use_dns && link->ndisc_rdnss) {
3293 NDiscRDNSS *dd;
3294
3295 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3296 if (space)
3297 fputc(' ', f);
3298
3299 serialize_in6_addrs(f, &dd->address, 1);
3300 space = true;
3301 }
3302 }
3303
3304 fputc('\n', f);
3305
3306 fputs("NTP=", f);
3307 space = false;
3308 fputstrv(f, link->network->ntp, NULL, &space);
3309
3310 if (link->network->dhcp_use_ntp &&
3311 link->dhcp_lease) {
3312 const struct in_addr *addresses;
3313
3314 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3315 if (r > 0) {
3316 if (space)
3317 fputc(' ', f);
3318 serialize_in_addrs(f, addresses, r);
3319 space = true;
3320 }
3321 }
3322
3323 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3324 struct in6_addr *in6_addrs;
3325 char **hosts;
3326
3327 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3328 &in6_addrs);
3329 if (r > 0) {
3330 if (space)
3331 fputc(' ', f);
3332 serialize_in6_addrs(f, in6_addrs, r);
3333 space = true;
3334 }
3335
3336 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3337 if (r > 0)
3338 fputstrv(f, hosts, NULL, &space);
3339 }
3340
3341 fputc('\n', f);
3342
3343 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3344 if (link->dhcp_lease)
3345 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3346 if (dhcp6_lease)
3347 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3348 }
3349
3350 fputs("DOMAINS=", f);
3351 fputstrv(f, link->network->search_domains, NULL, &space);
3352
3353 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3354 NDiscDNSSL *dd;
3355
3356 if (dhcp_domainname)
3357 fputs_with_space(f, dhcp_domainname, NULL, &space);
3358 if (dhcp6_domains)
3359 fputstrv(f, dhcp6_domains, NULL, &space);
3360
3361 SET_FOREACH(dd, link->ndisc_dnssl, i)
3362 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3363 }
3364
3365 fputc('\n', f);
3366
3367 fputs("ROUTE_DOMAINS=", f);
3368 fputstrv(f, link->network->route_domains, NULL, NULL);
3369
3370 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3371 NDiscDNSSL *dd;
3372
3373 if (dhcp_domainname)
3374 fputs_with_space(f, dhcp_domainname, NULL, &space);
3375 if (dhcp6_domains)
3376 fputstrv(f, dhcp6_domains, NULL, &space);
3377
3378 SET_FOREACH(dd, link->ndisc_dnssl, i)
3379 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3380 }
3381
3382 fputc('\n', f);
3383
3384 fprintf(f, "LLMNR=%s\n",
3385 resolve_support_to_string(link->network->llmnr));
3386 fprintf(f, "MDNS=%s\n",
3387 resolve_support_to_string(link->network->mdns));
3388
3389 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3390 fprintf(f, "DNSSEC=%s\n",
3391 dnssec_mode_to_string(link->network->dnssec_mode));
3392
3393 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3394 const char *n;
3395
3396 fputs("DNSSEC_NTA=", f);
3397 space = false;
3398 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3399 fputs_with_space(f, n, NULL, &space);
3400 fputc('\n', f);
3401 }
3402
3403 fputs("ADDRESSES=", f);
3404 space = false;
3405 SET_FOREACH(a, link->addresses, i) {
3406 _cleanup_free_ char *address_str = NULL;
3407
3408 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3409 if (r < 0)
3410 goto fail;
3411
3412 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3413 space = true;
3414 }
3415 fputc('\n', f);
3416
3417 fputs("ROUTES=", f);
3418 space = false;
3419 SET_FOREACH(route, link->routes, i) {
3420 _cleanup_free_ char *route_str = NULL;
3421
3422 r = in_addr_to_string(route->family, &route->dst, &route_str);
3423 if (r < 0)
3424 goto fail;
3425
3426 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%hhu/"USEC_FMT, space ? " " : "", route_str,
3427 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3428 space = true;
3429 }
3430
3431 fputc('\n', f);
3432 }
3433
3434 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3435 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3436
3437 if (link->dhcp_lease) {
3438 struct in_addr address;
3439 const char *tz = NULL;
3440
3441 assert(link->network);
3442
3443 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3444 if (r >= 0)
3445 fprintf(f, "TIMEZONE=%s\n", tz);
3446
3447 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3448 if (r >= 0) {
3449 fputs("DHCP4_ADDRESS=", f);
3450 serialize_in_addrs(f, &address, 1);
3451 fputc('\n', f);
3452 }
3453
3454 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3455 if (r < 0)
3456 goto fail;
3457
3458 fprintf(f,
3459 "DHCP_LEASE=%s\n",
3460 link->lease_file);
3461 } else
3462 unlink(link->lease_file);
3463
3464 if (link->ipv4ll) {
3465 struct in_addr address;
3466
3467 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3468 if (r >= 0) {
3469 fputs("IPV4LL_ADDRESS=", f);
3470 serialize_in_addrs(f, &address, 1);
3471 fputc('\n', f);
3472 }
3473 }
3474
3475 r = fflush_and_check(f);
3476 if (r < 0)
3477 goto fail;
3478
3479 if (rename(temp_path, link->state_file) < 0) {
3480 r = -errno;
3481 goto fail;
3482 }
3483
3484 return 0;
3485
3486 fail:
3487 (void) unlink(link->state_file);
3488 if (temp_path)
3489 (void) unlink(temp_path);
3490
3491 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3492 }
3493
3494 /* The serialized state in /run is no longer up-to-date. */
3495 void link_dirty(Link *link) {
3496 int r;
3497
3498 assert(link);
3499
3500 /* mark manager dirty as link is dirty */
3501 manager_dirty(link->manager);
3502
3503 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3504 if (r < 0)
3505 /* allocation errors are ignored */
3506 return;
3507
3508 r = set_put(link->manager->dirty_links, link);
3509 if (r <= 0)
3510 /* don't take another ref if the link was already dirty */
3511 return;
3512
3513 link_ref(link);
3514 }
3515
3516 /* The serialized state in /run is up-to-date */
3517 void link_clean(Link *link) {
3518 assert(link);
3519 assert(link->manager);
3520
3521 set_remove(link->manager->dirty_links, link);
3522 link_unref(link);
3523 }
3524
3525 static const char* const link_state_table[_LINK_STATE_MAX] = {
3526 [LINK_STATE_PENDING] = "pending",
3527 [LINK_STATE_ENSLAVING] = "configuring",
3528 [LINK_STATE_SETTING_ADDRESSES] = "configuring",
3529 [LINK_STATE_SETTING_ROUTES] = "configuring",
3530 [LINK_STATE_CONFIGURED] = "configured",
3531 [LINK_STATE_UNMANAGED] = "unmanaged",
3532 [LINK_STATE_FAILED] = "failed",
3533 [LINK_STATE_LINGER] = "linger",
3534 };
3535
3536 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
3537
3538 static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
3539 [LINK_OPERSTATE_OFF] = "off",
3540 [LINK_OPERSTATE_NO_CARRIER] = "no-carrier",
3541 [LINK_OPERSTATE_DORMANT] = "dormant",
3542 [LINK_OPERSTATE_CARRIER] = "carrier",
3543 [LINK_OPERSTATE_DEGRADED] = "degraded",
3544 [LINK_OPERSTATE_ROUTABLE] = "routable",
3545 };
3546
3547 DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
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