]> git.ipfire.org Git - thirdparty/systemd.git/blob - src/network/networkd-link.c
projects / thirdparty / systemd.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge pull request #5774 from keszybz/printf-annotations
[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-ipv6-proxy-ndp.h"
32 #include "networkd-lldp-tx.h"
33 #include "networkd-manager.h"
34 #include "networkd-ndisc.h"
35 #include "set.h"
36 #include "socket-util.h"
37 #include "stdio-util.h"
38 #include "string-table.h"
39 #include "udev-util.h"
40 #include "util.h"
41 #include "virt.h"
42
43 static bool link_dhcp6_enabled(Link *link) {
44 assert(link);
45
46 if (!socket_ipv6_is_supported())
47 return false;
48
49 if (link->flags & IFF_LOOPBACK)
50 return false;
51
52 if (!link->network)
53 return false;
54
55 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
56 }
57
58 static bool link_dhcp4_enabled(Link *link) {
59 assert(link);
60
61 if (link->flags & IFF_LOOPBACK)
62 return false;
63
64 if (!link->network)
65 return false;
66
67 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
68 }
69
70 static bool link_dhcp4_server_enabled(Link *link) {
71 assert(link);
72
73 if (link->flags & IFF_LOOPBACK)
74 return false;
75
76 if (!link->network)
77 return false;
78
79 return link->network->dhcp_server;
80 }
81
82 static bool link_ipv4ll_enabled(Link *link) {
83 assert(link);
84
85 if (link->flags & IFF_LOOPBACK)
86 return false;
87
88 if (!link->network)
89 return false;
90
91 return link->network->link_local & ADDRESS_FAMILY_IPV4;
92 }
93
94 static bool link_ipv6ll_enabled(Link *link) {
95 assert(link);
96
97 if (!socket_ipv6_is_supported())
98 return false;
99
100 if (link->flags & IFF_LOOPBACK)
101 return false;
102
103 if (!link->network)
104 return false;
105
106 return link->network->link_local & ADDRESS_FAMILY_IPV6;
107 }
108
109 static bool link_ipv6_enabled(Link *link) {
110 assert(link);
111
112 if (!socket_ipv6_is_supported())
113 return false;
114
115 if (link->network->bridge)
116 return false;
117
118 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
119 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
120 }
121
122 static bool link_lldp_rx_enabled(Link *link) {
123 assert(link);
124
125 if (link->flags & IFF_LOOPBACK)
126 return false;
127
128 if (link->iftype != ARPHRD_ETHER)
129 return false;
130
131 if (!link->network)
132 return false;
133
134 if (link->network->bridge)
135 return false;
136
137 return link->network->lldp_mode != LLDP_MODE_NO;
138 }
139
140 static bool link_lldp_emit_enabled(Link *link) {
141 assert(link);
142
143 if (link->flags & IFF_LOOPBACK)
144 return false;
145
146 if (link->iftype != ARPHRD_ETHER)
147 return false;
148
149 if (!link->network)
150 return false;
151
152 return link->network->lldp_emit != LLDP_EMIT_NO;
153 }
154
155 static bool link_ipv4_forward_enabled(Link *link) {
156 assert(link);
157
158 if (link->flags & IFF_LOOPBACK)
159 return false;
160
161 if (!link->network)
162 return false;
163
164 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
165 return false;
166
167 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
168 }
169
170 static bool link_ipv6_forward_enabled(Link *link) {
171 assert(link);
172
173 if (!socket_ipv6_is_supported())
174 return false;
175
176 if (link->flags & IFF_LOOPBACK)
177 return false;
178
179 if (!link->network)
180 return false;
181
182 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
183 return false;
184
185 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
186 }
187
188 static bool link_proxy_arp_enabled(Link *link) {
189 assert(link);
190
191 if (link->flags & IFF_LOOPBACK)
192 return false;
193
194 if (!link->network)
195 return false;
196
197 if (link->network->proxy_arp < 0)
198 return false;
199
200 return true;
201 }
202
203 static bool link_ipv6_accept_ra_enabled(Link *link) {
204 assert(link);
205
206 if (!socket_ipv6_is_supported())
207 return false;
208
209 if (link->flags & IFF_LOOPBACK)
210 return false;
211
212 if (!link->network)
213 return false;
214
215 /* If unset use system default (enabled if local forwarding is disabled.
216 * disabled if local forwarding is enabled).
217 * If set, ignore or enforce RA independent of local forwarding state.
218 */
219 if (link->network->ipv6_accept_ra < 0)
220 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
221 return !link_ipv6_forward_enabled(link);
222 else if (link->network->ipv6_accept_ra > 0)
223 /* accept RA even if ip_forward is enabled */
224 return true;
225 else
226 /* ignore RA */
227 return false;
228 }
229
230 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
231 assert(link);
232
233 if (!socket_ipv6_is_supported())
234 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
235
236 if (link->flags & IFF_LOOPBACK)
237 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
238
239 if (!link->network)
240 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
241
242 return link->network->ipv6_privacy_extensions;
243 }
244
245 static int link_enable_ipv6(Link *link) {
246 const char *p = NULL;
247 bool disabled;
248 int r;
249
250 if (link->flags & IFF_LOOPBACK)
251 return 0;
252
253 disabled = !link_ipv6_enabled(link);
254
255 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/disable_ipv6");
256
257 r = write_string_file(p, one_zero(disabled), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
258 if (r < 0)
259 log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m",
260 enable_disable(!disabled), link->ifname);
261 else
262 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
263
264 return 0;
265 }
266
267 void link_update_operstate(Link *link) {
268 LinkOperationalState operstate;
269 assert(link);
270
271 if (link->kernel_operstate == IF_OPER_DORMANT)
272 operstate = LINK_OPERSTATE_DORMANT;
273 else if (link_has_carrier(link)) {
274 Address *address;
275 uint8_t scope = RT_SCOPE_NOWHERE;
276 Iterator i;
277
278 /* if we have carrier, check what addresses we have */
279 SET_FOREACH(address, link->addresses, i) {
280 if (!address_is_ready(address))
281 continue;
282
283 if (address->scope < scope)
284 scope = address->scope;
285 }
286
287 /* for operstate we also take foreign addresses into account */
288 SET_FOREACH(address, link->addresses_foreign, i) {
289 if (!address_is_ready(address))
290 continue;
291
292 if (address->scope < scope)
293 scope = address->scope;
294 }
295
296 if (scope < RT_SCOPE_SITE)
297 /* universally accessible addresses found */
298 operstate = LINK_OPERSTATE_ROUTABLE;
299 else if (scope < RT_SCOPE_HOST)
300 /* only link or site local addresses found */
301 operstate = LINK_OPERSTATE_DEGRADED;
302 else
303 /* no useful addresses found */
304 operstate = LINK_OPERSTATE_CARRIER;
305 } else if (link->flags & IFF_UP)
306 operstate = LINK_OPERSTATE_NO_CARRIER;
307 else
308 operstate = LINK_OPERSTATE_OFF;
309
310 if (link->operstate != operstate) {
311 link->operstate = operstate;
312 link_send_changed(link, "OperationalState", NULL);
313 link_dirty(link);
314 }
315 }
316
317 #define FLAG_STRING(string, flag, old, new) \
318 (((old ^ new) & flag) \
319 ? ((old & flag) ? (" -" string) : (" +" string)) \
320 : "")
321
322 static int link_update_flags(Link *link, sd_netlink_message *m) {
323 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
324 uint8_t operstate;
325 int r;
326
327 assert(link);
328
329 r = sd_rtnl_message_link_get_flags(m, &flags);
330 if (r < 0)
331 return log_link_warning_errno(link, r, "Could not get link flags: %m");
332
333 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
334 if (r < 0)
335 /* if we got a message without operstate, take it to mean
336 the state was unchanged */
337 operstate = link->kernel_operstate;
338
339 if ((link->flags == flags) && (link->kernel_operstate == operstate))
340 return 0;
341
342 if (link->flags != flags) {
343 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",
344 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
345 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
346 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
347 FLAG_STRING("UP", IFF_UP, link->flags, flags),
348 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
349 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
350 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
351 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
352 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
353 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
354 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
355 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
356 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
357 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
358 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
359 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
360 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
361 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
362 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
363
364 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
365 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
366 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
367 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
368 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
369 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
370 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
371 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
372
373 /* link flags are currently at most 18 bits, let's align to
374 * printing 20 */
375 if (unknown_flags_added)
376 log_link_debug(link,
377 "Unknown link flags gained: %#.5x (ignoring)",
378 unknown_flags_added);
379
380 if (unknown_flags_removed)
381 log_link_debug(link,
382 "Unknown link flags lost: %#.5x (ignoring)",
383 unknown_flags_removed);
384 }
385
386 link->flags = flags;
387 link->kernel_operstate = operstate;
388
389 link_update_operstate(link);
390
391 return 0;
392 }
393
394 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
395 _cleanup_link_unref_ Link *link = NULL;
396 uint16_t type;
397 const char *ifname, *kind = NULL;
398 int r, ifindex;
399 unsigned short iftype;
400
401 assert(manager);
402 assert(message);
403 assert(ret);
404
405 /* check for link kind */
406 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
407 if (r == 0) {
408 (void)sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
409 r = sd_netlink_message_exit_container(message);
410 if (r < 0)
411 return r;
412 }
413
414 r = sd_netlink_message_get_type(message, &type);
415 if (r < 0)
416 return r;
417 else if (type != RTM_NEWLINK)
418 return -EINVAL;
419
420 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
421 if (r < 0)
422 return r;
423 else if (ifindex <= 0)
424 return -EINVAL;
425
426 r = sd_rtnl_message_link_get_type(message, &iftype);
427 if (r < 0)
428 return r;
429
430 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
431 if (r < 0)
432 return r;
433
434 link = new0(Link, 1);
435 if (!link)
436 return -ENOMEM;
437
438 link->n_ref = 1;
439 link->manager = manager;
440 link->state = LINK_STATE_PENDING;
441 link->rtnl_extended_attrs = true;
442 link->ifindex = ifindex;
443 link->iftype = iftype;
444 link->ifname = strdup(ifname);
445 if (!link->ifname)
446 return -ENOMEM;
447
448 if (kind) {
449 link->kind = strdup(kind);
450 if (!link->kind)
451 return -ENOMEM;
452 }
453
454 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
455 if (r < 0)
456 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
457
458 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
459 return -ENOMEM;
460
461 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
462 return -ENOMEM;
463
464 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
465 return -ENOMEM;
466
467 r = hashmap_ensure_allocated(&manager->links, NULL);
468 if (r < 0)
469 return r;
470
471 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
472 if (r < 0)
473 return r;
474
475 r = link_update_flags(link, message);
476 if (r < 0)
477 return r;
478
479 *ret = link;
480 link = NULL;
481
482 return 0;
483 }
484
485 static void link_free(Link *link) {
486 Address *address;
487 Iterator i;
488 Link *carrier;
489
490 if (!link)
491 return;
492
493 while (!set_isempty(link->addresses))
494 address_free(set_first(link->addresses));
495
496 while (!set_isempty(link->addresses_foreign))
497 address_free(set_first(link->addresses_foreign));
498
499 link->addresses = set_free(link->addresses);
500
501 link->addresses_foreign = set_free(link->addresses_foreign);
502
503 while ((address = link->pool_addresses)) {
504 LIST_REMOVE(addresses, link->pool_addresses, address);
505 address_free(address);
506 }
507
508 sd_dhcp_server_unref(link->dhcp_server);
509 sd_dhcp_client_unref(link->dhcp_client);
510 sd_dhcp_lease_unref(link->dhcp_lease);
511
512 link_lldp_emit_stop(link);
513
514 free(link->lease_file);
515
516 sd_lldp_unref(link->lldp);
517 free(link->lldp_file);
518
519 ndisc_flush(link);
520
521 sd_ipv4ll_unref(link->ipv4ll);
522 sd_dhcp6_client_unref(link->dhcp6_client);
523 sd_ndisc_unref(link->ndisc);
524
525 if (link->manager)
526 hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex));
527
528 free(link->ifname);
529
530 free(link->kind);
531
532 (void)unlink(link->state_file);
533 free(link->state_file);
534
535 udev_device_unref(link->udev_device);
536
537 HASHMAP_FOREACH (carrier, link->bound_to_links, i)
538 hashmap_remove(link->bound_to_links, INT_TO_PTR(carrier->ifindex));
539 hashmap_free(link->bound_to_links);
540
541 HASHMAP_FOREACH (carrier, link->bound_by_links, i)
542 hashmap_remove(link->bound_by_links, INT_TO_PTR(carrier->ifindex));
543 hashmap_free(link->bound_by_links);
544
545 free(link);
546 }
547
548 Link *link_unref(Link *link) {
549 if (!link)
550 return NULL;
551
552 assert(link->n_ref > 0);
553
554 link->n_ref--;
555
556 if (link->n_ref > 0)
557 return NULL;
558
559 link_free(link);
560
561 return NULL;
562 }
563
564 Link *link_ref(Link *link) {
565 if (!link)
566 return NULL;
567
568 assert(link->n_ref > 0);
569
570 link->n_ref++;
571
572 return link;
573 }
574
575 int link_get(Manager *m, int ifindex, Link **ret) {
576 Link *link;
577
578 assert(m);
579 assert(ifindex);
580 assert(ret);
581
582 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
583 if (!link)
584 return -ENODEV;
585
586 *ret = link;
587
588 return 0;
589 }
590
591 static void link_set_state(Link *link, LinkState state) {
592 assert(link);
593
594 if (link->state == state)
595 return;
596
597 link->state = state;
598
599 link_send_changed(link, "AdministrativeState", NULL);
600 }
601
602 static void link_enter_unmanaged(Link *link) {
603 assert(link);
604
605 log_link_debug(link, "Unmanaged");
606
607 link_set_state(link, LINK_STATE_UNMANAGED);
608
609 link_dirty(link);
610 }
611
612 static int link_stop_clients(Link *link) {
613 int r = 0, k;
614
615 assert(link);
616 assert(link->manager);
617 assert(link->manager->event);
618
619 if (link->dhcp_client) {
620 k = sd_dhcp_client_stop(link->dhcp_client);
621 if (k < 0)
622 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
623 }
624
625 if (link->ipv4ll) {
626 k = sd_ipv4ll_stop(link->ipv4ll);
627 if (k < 0)
628 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
629 }
630
631 if (link->dhcp6_client) {
632 k = sd_dhcp6_client_stop(link->dhcp6_client);
633 if (k < 0)
634 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
635 }
636
637 if (link->ndisc) {
638 k = sd_ndisc_stop(link->ndisc);
639 if (k < 0)
640 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
641 }
642
643 link_lldp_emit_stop(link);
644 return r;
645 }
646
647 void link_enter_failed(Link *link) {
648 assert(link);
649
650 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
651 return;
652
653 log_link_warning(link, "Failed");
654
655 link_set_state(link, LINK_STATE_FAILED);
656
657 link_stop_clients(link);
658
659 link_dirty(link);
660 }
661
662 static Address* link_find_dhcp_server_address(Link *link) {
663 Address *address;
664
665 assert(link);
666 assert(link->network);
667
668 /* The first statically configured address if there is any */
669 LIST_FOREACH(addresses, address, link->network->static_addresses) {
670
671 if (address->family != AF_INET)
672 continue;
673
674 if (in_addr_is_null(address->family, &address->in_addr))
675 continue;
676
677 return address;
678 }
679
680 /* If that didn't work, find a suitable address we got from the pool */
681 LIST_FOREACH(addresses, address, link->pool_addresses) {
682 if (address->family != AF_INET)
683 continue;
684
685 return address;
686 }
687
688 return NULL;
689 }
690
691 static void link_enter_configured(Link *link) {
692 assert(link);
693 assert(link->network);
694
695 if (link->state != LINK_STATE_SETTING_ROUTES)
696 return;
697
698 log_link_info(link, "Configured");
699
700 link_set_state(link, LINK_STATE_CONFIGURED);
701
702 link_dirty(link);
703 }
704
705 void link_check_ready(Link *link) {
706 Address *a;
707 Iterator i;
708
709 assert(link);
710
711 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
712 return;
713
714 if (!link->network)
715 return;
716
717 if (!link->static_configured)
718 return;
719
720 if (link_ipv4ll_enabled(link))
721 if (!link->ipv4ll_address ||
722 !link->ipv4ll_route)
723 return;
724
725 if (link_ipv6ll_enabled(link))
726 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) > 0)
727 return;
728
729 if ((link_dhcp4_enabled(link) && !link_dhcp6_enabled(link) &&
730 !link->dhcp4_configured) ||
731 (link_dhcp6_enabled(link) && !link_dhcp4_enabled(link) &&
732 !link->dhcp6_configured) ||
733 (link_dhcp4_enabled(link) && link_dhcp6_enabled(link) &&
734 !link->dhcp4_configured && !link->dhcp6_configured))
735 return;
736
737 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
738 return;
739
740 SET_FOREACH(a, link->addresses, i)
741 if (!address_is_ready(a))
742 return;
743
744 if (link->state != LINK_STATE_CONFIGURED)
745 link_enter_configured(link);
746
747 return;
748 }
749
750 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
751 _cleanup_link_unref_ Link *link = userdata;
752 int r;
753
754 assert(link->link_messages > 0);
755 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
756 LINK_STATE_SETTING_ROUTES, LINK_STATE_FAILED,
757 LINK_STATE_LINGER));
758
759 link->link_messages--;
760
761 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
762 return 1;
763
764 r = sd_netlink_message_get_errno(m);
765 if (r < 0 && r != -EEXIST)
766 log_link_warning_errno(link, r, "Could not set route: %m");
767
768 if (link->link_messages == 0) {
769 log_link_debug(link, "Routes set");
770 link->static_configured = true;
771 link_check_ready(link);
772 }
773
774 return 1;
775 }
776
777 static int link_enter_set_routes(Link *link) {
778 Route *rt;
779 int r;
780
781 assert(link);
782 assert(link->network);
783 assert(link->state == LINK_STATE_SETTING_ADDRESSES);
784
785 link_set_state(link, LINK_STATE_SETTING_ROUTES);
786
787 LIST_FOREACH(routes, rt, link->network->static_routes) {
788 r = route_configure(rt, link, route_handler);
789 if (r < 0) {
790 log_link_warning_errno(link, r, "Could not set routes: %m");
791 link_enter_failed(link);
792 return r;
793 }
794
795 link->link_messages++;
796 }
797
798 if (link->link_messages == 0) {
799 link->static_configured = true;
800 link_check_ready(link);
801 } else
802 log_link_debug(link, "Setting routes");
803
804 return 0;
805 }
806
807 int link_route_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
808 _cleanup_link_unref_ Link *link = userdata;
809 int r;
810
811 assert(m);
812 assert(link);
813 assert(link->ifname);
814
815 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
816 return 1;
817
818 r = sd_netlink_message_get_errno(m);
819 if (r < 0 && r != -ESRCH)
820 log_link_warning_errno(link, r, "Could not drop route: %m");
821
822 return 1;
823 }
824
825 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
826 _cleanup_link_unref_ Link *link = userdata;
827 int r;
828
829 assert(rtnl);
830 assert(m);
831 assert(link);
832 assert(link->ifname);
833 assert(link->link_messages > 0);
834 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
835 LINK_STATE_FAILED, LINK_STATE_LINGER));
836
837 link->link_messages--;
838
839 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
840 return 1;
841
842 r = sd_netlink_message_get_errno(m);
843 if (r < 0 && r != -EEXIST)
844 log_link_warning_errno(link, r, "could not set address: %m");
845 else if (r >= 0)
846 manager_rtnl_process_address(rtnl, m, link->manager);
847
848 if (link->link_messages == 0) {
849 log_link_debug(link, "Addresses set");
850 link_enter_set_routes(link);
851 }
852
853 return 1;
854 }
855
856 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
857 _cleanup_free_ struct in_addr *addresses = NULL;
858 size_t n_addresses = 0, n_allocated = 0;
859 unsigned i;
860
861 log_debug("Copying DNS server information from %s", link->ifname);
862
863 if (!link->network)
864 return 0;
865
866 for (i = 0; i < link->network->n_dns; i++) {
867 struct in_addr ia;
868
869 /* Only look for IPv4 addresses */
870 if (link->network->dns[i].family != AF_INET)
871 continue;
872
873 ia = link->network->dns[i].address.in;
874
875 /* Never propagate obviously borked data */
876 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
877 continue;
878
879 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
880 return log_oom();
881
882 addresses[n_addresses++] = ia;
883 }
884
885 if (link->network->dhcp_use_dns && link->dhcp_lease) {
886 const struct in_addr *da = NULL;
887 int n;
888
889 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
890 if (n > 0) {
891
892 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
893 return log_oom();
894
895 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
896 n_addresses += n;
897 }
898 }
899
900 if (n_addresses <= 0)
901 return 0;
902
903 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
904 }
905
906 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
907 _cleanup_free_ struct in_addr *addresses = NULL;
908 size_t n_addresses = 0, n_allocated = 0;
909 char **a;
910
911 if (!link->network)
912 return 0;
913
914 log_debug("Copying NTP server information from %s", link->ifname);
915
916 STRV_FOREACH(a, link->network->ntp) {
917 struct in_addr ia;
918
919 /* Only look for IPv4 addresses */
920 if (inet_pton(AF_INET, *a, &ia) <= 0)
921 continue;
922
923 /* Never propagate obviously borked data */
924 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
925 continue;
926
927 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
928 return log_oom();
929
930 addresses[n_addresses++] = ia;
931 }
932
933 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
934 const struct in_addr *da = NULL;
935 int n;
936
937 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
938 if (n > 0) {
939
940 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
941 return log_oom();
942
943 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
944 n_addresses += n;
945 }
946 }
947
948 if (n_addresses <= 0)
949 return 0;
950
951 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
952 }
953
954 static int link_set_bridge_fdb(Link *link) {
955 FdbEntry *fdb_entry;
956 int r;
957
958 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
959 r = fdb_entry_configure(link, fdb_entry);
960 if (r < 0)
961 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
962 }
963
964 return 0;
965 }
966
967 static int link_enter_set_addresses(Link *link) {
968 Address *ad;
969 int r;
970
971 assert(link);
972 assert(link->network);
973 assert(link->state != _LINK_STATE_INVALID);
974
975 r = link_set_bridge_fdb(link);
976 if (r < 0)
977 return r;
978
979 link_set_state(link, LINK_STATE_SETTING_ADDRESSES);
980
981 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
982 r = address_configure(ad, link, address_handler, false);
983 if (r < 0) {
984 log_link_warning_errno(link, r, "Could not set addresses: %m");
985 link_enter_failed(link);
986 return r;
987 }
988
989 link->link_messages++;
990 }
991
992 /* now that we can figure out a default address for the dhcp server,
993 start it */
994 if (link_dhcp4_server_enabled(link)) {
995 Address *address;
996 Link *uplink = NULL;
997 bool acquired_uplink = false;
998
999 address = link_find_dhcp_server_address(link);
1000 if (!address) {
1001 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1002 link_enter_failed(link);
1003 return 0;
1004 }
1005
1006 /* use the server address' subnet as the pool */
1007 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1008 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1009 if (r < 0)
1010 return r;
1011
1012 /* TODO:
1013 r = sd_dhcp_server_set_router(link->dhcp_server,
1014 &main_address->in_addr.in);
1015 if (r < 0)
1016 return r;
1017 */
1018
1019 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1020 r = sd_dhcp_server_set_max_lease_time(
1021 link->dhcp_server,
1022 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1023 if (r < 0)
1024 return r;
1025 }
1026
1027 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1028 r = sd_dhcp_server_set_default_lease_time(
1029 link->dhcp_server,
1030 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1031 if (r < 0)
1032 return r;
1033 }
1034
1035 if (link->network->dhcp_server_emit_dns) {
1036
1037 if (link->network->n_dhcp_server_dns > 0)
1038 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1039 else {
1040 uplink = manager_find_uplink(link->manager, link);
1041 acquired_uplink = true;
1042
1043 if (!uplink) {
1044 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1045 r = 0;
1046 } else
1047 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1048 }
1049 if (r < 0)
1050 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1051 }
1052
1053
1054 if (link->network->dhcp_server_emit_ntp) {
1055
1056 if (link->network->n_dhcp_server_ntp > 0)
1057 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1058 else {
1059 if (!acquired_uplink)
1060 uplink = manager_find_uplink(link->manager, link);
1061
1062 if (!uplink) {
1063 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1064 r = 0;
1065 } else
1066 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1067
1068 }
1069 if (r < 0)
1070 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1071 }
1072
1073 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1074 if (r < 0) {
1075 log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1076 return r;
1077 }
1078
1079 if (link->network->dhcp_server_emit_timezone) {
1080 _cleanup_free_ char *buffer = NULL;
1081 const char *tz = NULL;
1082
1083 if (link->network->dhcp_server_timezone)
1084 tz = link->network->dhcp_server_timezone;
1085 else {
1086 r = get_timezone(&buffer);
1087 if (r < 0)
1088 log_warning_errno(r, "Failed to determine timezone: %m");
1089 else
1090 tz = buffer;
1091 }
1092
1093 if (tz) {
1094 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1095 if (r < 0)
1096 return r;
1097 }
1098 }
1099
1100 r = sd_dhcp_server_start(link->dhcp_server);
1101 if (r < 0) {
1102 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1103
1104 link_enter_failed(link);
1105
1106 return 0;
1107 }
1108
1109 log_link_debug(link, "Offering DHCPv4 leases");
1110 }
1111
1112 if (link->link_messages == 0)
1113 link_enter_set_routes(link);
1114 else
1115 log_link_debug(link, "Setting addresses");
1116
1117 return 0;
1118 }
1119
1120 int link_address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1121 _cleanup_link_unref_ Link *link = userdata;
1122 int r;
1123
1124 assert(m);
1125 assert(link);
1126 assert(link->ifname);
1127
1128 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1129 return 1;
1130
1131 r = sd_netlink_message_get_errno(m);
1132 if (r < 0 && r != -EADDRNOTAVAIL)
1133 log_link_warning_errno(link, r, "Could not drop address: %m");
1134
1135 return 1;
1136 }
1137
1138 static int link_set_bridge_vlan(Link *link) {
1139 int r = 0;
1140
1141 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1142 if (r < 0)
1143 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1144
1145 return r;
1146 }
1147
1148 static int link_set_proxy_arp(Link *link) {
1149 const char *p = NULL;
1150 int r;
1151
1152 if (!link_proxy_arp_enabled(link))
1153 return 0;
1154
1155 p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/proxy_arp");
1156
1157 r = write_string_file(p, one_zero(link->network->proxy_arp), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
1158 if (r < 0)
1159 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1160
1161 return 0;
1162 }
1163
1164 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1165 _cleanup_link_unref_ Link *link = userdata;
1166 int r;
1167
1168 log_link_debug(link, "Set link");
1169
1170 r = sd_netlink_message_get_errno(m);
1171 if (r < 0 && r != -EEXIST) {
1172 log_link_error_errno(link, r, "Could not join netdev: %m");
1173 link_enter_failed(link);
1174 return 1;
1175 }
1176
1177 return 0;
1178 }
1179
1180 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1181 _cleanup_link_unref_ Link *link = userdata;
1182 int r;
1183
1184 assert(m);
1185 assert(link);
1186 assert(link->ifname);
1187
1188 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1189 return 1;
1190
1191 r = sd_netlink_message_get_errno(m);
1192 if (r < 0)
1193 log_link_warning_errno(link, r, "Could not set MTU: %m");
1194
1195 return 1;
1196 }
1197
1198 int link_set_mtu(Link *link, uint32_t mtu) {
1199 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1200 int r;
1201
1202 assert(link);
1203 assert(link->manager);
1204 assert(link->manager->rtnl);
1205
1206 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1207
1208 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1209 if (r < 0)
1210 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1211
1212 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1213 if (r < 0)
1214 return log_link_error_errno(link, r, "Could not append MTU: %m");
1215
1216 r = sd_netlink_call_async(link->manager->rtnl, req, set_mtu_handler, link, 0, NULL);
1217 if (r < 0)
1218 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1219
1220 link_ref(link);
1221
1222 return 0;
1223 }
1224
1225 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1226 _cleanup_link_unref_ Link *link = userdata;
1227 int r;
1228
1229 assert(m);
1230 assert(link);
1231 assert(link->ifname);
1232
1233 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1234 return 1;
1235
1236 r = sd_netlink_message_get_errno(m);
1237 if (r < 0)
1238 log_link_warning_errno(link, r, "Could not set link flags: %m");
1239
1240 return 1;
1241 }
1242
1243 static int link_set_flags(Link *link) {
1244 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1245 unsigned ifi_change = 0;
1246 unsigned ifi_flags = 0;
1247 int r;
1248
1249 assert(link);
1250 assert(link->manager);
1251 assert(link->manager->rtnl);
1252
1253 if (link->flags & IFF_LOOPBACK)
1254 return 0;
1255
1256 if (!link->network)
1257 return 0;
1258
1259 if (link->network->arp < 0)
1260 return 0;
1261
1262 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1263 if (r < 0)
1264 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1265
1266 if (link->network->arp >= 0) {
1267 ifi_change |= IFF_NOARP;
1268 ifi_flags |= link->network->arp ? 0 : IFF_NOARP;
1269 }
1270
1271 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1272 if (r < 0)
1273 return log_link_error_errno(link, r, "Could not set link flags: %m");
1274
1275 r = sd_netlink_call_async(link->manager->rtnl, req, set_flags_handler, link, 0, NULL);
1276 if (r < 0)
1277 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1278
1279 link_ref(link);
1280
1281 return 0;
1282 }
1283
1284 static int link_set_bridge(Link *link) {
1285 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1286 int r;
1287
1288 assert(link);
1289 assert(link->network);
1290
1291 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1292 if (r < 0)
1293 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1294
1295 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1296 if (r < 0)
1297 return log_link_error_errno(link, r, "Could not set message family: %m");
1298
1299 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1300 if (r < 0)
1301 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1302
1303 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, !link->network->use_bpdu);
1304 if (r < 0)
1305 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1306
1307 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1308 if (r < 0)
1309 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1310
1311 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1312 if (r < 0)
1313 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1314
1315 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, !link->network->allow_port_to_be_root);
1316 if (r < 0)
1317 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1318
1319 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1320 if (r < 0)
1321 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1322
1323 if (link->network->cost != 0) {
1324 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1325 if (r < 0)
1326 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1327 }
1328 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1329 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1330 if (r < 0)
1331 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1332 }
1333
1334 r = sd_netlink_message_close_container(req);
1335 if (r < 0)
1336 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1337
1338 r = sd_netlink_call_async(link->manager->rtnl, req, link_set_handler, link, 0, NULL);
1339 if (r < 0)
1340 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1341
1342 link_ref(link);
1343
1344 return r;
1345 }
1346
1347 static int link_bond_set(Link *link) {
1348 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1349 int r;
1350
1351 assert(link);
1352 assert(link->network);
1353
1354 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1355 if (r < 0)
1356 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1357
1358 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1359 if (r < 0)
1360 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1361
1362 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1363 if (r < 0)
1364 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1365
1366 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1367 if (r < 0)
1368 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1369
1370 if (link->network->active_slave) {
1371 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1372 if (r < 0)
1373 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1374 }
1375
1376 if (link->network->primary_slave) {
1377 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1378 if (r < 0)
1379 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1380 }
1381
1382 r = sd_netlink_message_close_container(req);
1383 if (r < 0)
1384 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1385
1386 r = sd_netlink_message_close_container(req);
1387 if (r < 0)
1388 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1389
1390 r = sd_netlink_call_async(link->manager->rtnl, req, set_flags_handler, link, 0, NULL);
1391 if (r < 0)
1392 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1393
1394 link_ref(link);
1395
1396 return r;
1397 }
1398
1399 static int link_lldp_save(Link *link) {
1400 _cleanup_free_ char *temp_path = NULL;
1401 _cleanup_fclose_ FILE *f = NULL;
1402 sd_lldp_neighbor **l = NULL;
1403 int n = 0, r, i;
1404
1405 assert(link);
1406 assert(link->lldp_file);
1407
1408 if (!link->lldp) {
1409 (void) unlink(link->lldp_file);
1410 return 0;
1411 }
1412
1413 r = sd_lldp_get_neighbors(link->lldp, &l);
1414 if (r < 0)
1415 goto finish;
1416 if (r == 0) {
1417 (void) unlink(link->lldp_file);
1418 goto finish;
1419 }
1420
1421 n = r;
1422
1423 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1424 if (r < 0)
1425 goto finish;
1426
1427 fchmod(fileno(f), 0644);
1428
1429 for (i = 0; i < n; i++) {
1430 const void *p;
1431 le64_t u;
1432 size_t sz;
1433
1434 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1435 if (r < 0)
1436 goto finish;
1437
1438 u = htole64(sz);
1439 (void) fwrite(&u, 1, sizeof(u), f);
1440 (void) fwrite(p, 1, sz, f);
1441 }
1442
1443 r = fflush_and_check(f);
1444 if (r < 0)
1445 goto finish;
1446
1447 if (rename(temp_path, link->lldp_file) < 0) {
1448 r = -errno;
1449 goto finish;
1450 }
1451
1452 finish:
1453 if (r < 0) {
1454 (void) unlink(link->lldp_file);
1455 if (temp_path)
1456 (void) unlink(temp_path);
1457
1458 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1459 }
1460
1461 if (l) {
1462 for (i = 0; i < n; i++)
1463 sd_lldp_neighbor_unref(l[i]);
1464 free(l);
1465 }
1466
1467 return r;
1468 }
1469
1470 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1471 Link *link = userdata;
1472 int r;
1473
1474 assert(link);
1475
1476 (void) link_lldp_save(link);
1477
1478 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1479 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1480
1481 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1482
1483 r = link_lldp_emit_start(link);
1484 if (r < 0)
1485 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1486 }
1487 }
1488
1489 static int link_acquire_ipv6_conf(Link *link) {
1490 int r;
1491
1492 assert(link);
1493
1494 if (link_dhcp6_enabled(link)) {
1495 assert(link->dhcp6_client);
1496 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1497
1498 /* start DHCPv6 client in stateless mode */
1499 r = dhcp6_request_address(link, true);
1500 if (r < 0 && r != -EBUSY)
1501 return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m");
1502 else
1503 log_link_debug(link, "Acquiring DHCPv6 lease");
1504 }
1505
1506 if (link_ipv6_accept_ra_enabled(link)) {
1507 assert(link->ndisc);
1508
1509 log_link_debug(link, "Discovering IPv6 routers");
1510
1511 r = sd_ndisc_start(link->ndisc);
1512 if (r < 0 && r != -EBUSY)
1513 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1514 }
1515
1516 return 0;
1517 }
1518
1519 static int link_acquire_ipv4_conf(Link *link) {
1520 int r;
1521
1522 assert(link);
1523 assert(link->network);
1524 assert(link->manager);
1525 assert(link->manager->event);
1526
1527 if (link_ipv4ll_enabled(link)) {
1528 assert(link->ipv4ll);
1529
1530 log_link_debug(link, "Acquiring IPv4 link-local address");
1531
1532 r = sd_ipv4ll_start(link->ipv4ll);
1533 if (r < 0)
1534 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1535 }
1536
1537 if (link_dhcp4_enabled(link)) {
1538 assert(link->dhcp_client);
1539
1540 log_link_debug(link, "Acquiring DHCPv4 lease");
1541
1542 r = sd_dhcp_client_start(link->dhcp_client);
1543 if (r < 0)
1544 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1545 }
1546
1547 return 0;
1548 }
1549
1550 static int link_acquire_conf(Link *link) {
1551 int r;
1552
1553 assert(link);
1554
1555 r = link_acquire_ipv4_conf(link);
1556 if (r < 0)
1557 return r;
1558
1559 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) == 0) {
1560 r = link_acquire_ipv6_conf(link);
1561 if (r < 0)
1562 return r;
1563 }
1564
1565 if (link_lldp_emit_enabled(link)) {
1566 r = link_lldp_emit_start(link);
1567 if (r < 0)
1568 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1569 }
1570
1571 return 0;
1572 }
1573
1574 bool link_has_carrier(Link *link) {
1575 /* see Documentation/networking/operstates.txt in the kernel sources */
1576
1577 if (link->kernel_operstate == IF_OPER_UP)
1578 return true;
1579
1580 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1581 /* operstate may not be implemented, so fall back to flags */
1582 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1583 return true;
1584
1585 return false;
1586 }
1587
1588 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1589 _cleanup_link_unref_ Link *link = userdata;
1590 int r;
1591
1592 assert(link);
1593
1594 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1595 return 1;
1596
1597 r = sd_netlink_message_get_errno(m);
1598 if (r < 0)
1599 /* we warn but don't fail the link, as it may be
1600 brought up later */
1601 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1602
1603 return 1;
1604 }
1605
1606 static int link_up(Link *link) {
1607 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1608 uint8_t ipv6ll_mode;
1609 int r;
1610
1611 assert(link);
1612 assert(link->network);
1613 assert(link->manager);
1614 assert(link->manager->rtnl);
1615
1616 log_link_debug(link, "Bringing link up");
1617
1618 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1619 if (r < 0)
1620 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1621
1622 /* set it free if not enslaved with networkd */
1623 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1624 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1625 if (r < 0)
1626 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1627 }
1628
1629 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1630 if (r < 0)
1631 return log_link_error_errno(link, r, "Could not set link flags: %m");
1632
1633 if (link->network->mac) {
1634 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1635 if (r < 0)
1636 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1637 }
1638
1639 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1640 for this interface, or if it is a bridge slave, then disable IPv6 else enable it. */
1641 (void) link_enable_ipv6(link);
1642
1643 if (link->network->mtu) {
1644 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1645 on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1646 if (link_ipv6_enabled(link) && link->network->mtu < IPV6_MIN_MTU) {
1647
1648 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1649 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1650
1651 link->network->mtu = IPV6_MIN_MTU;
1652 }
1653
1654 r = sd_netlink_message_append_u32(req, IFLA_MTU, link->network->mtu);
1655 if (r < 0)
1656 return log_link_error_errno(link, r, "Could not set MTU: %m");
1657 }
1658
1659 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1660 if (r < 0)
1661 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1662
1663 if (link_ipv6_enabled(link)) {
1664 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
1665 r = sd_netlink_message_open_container(req, AF_INET6);
1666 if (r < 0)
1667 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1668
1669 if (!link_ipv6ll_enabled(link))
1670 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1671 else {
1672 const char *p = NULL;
1673 _cleanup_free_ char *stable_secret = NULL;
1674
1675 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/stable_secret");
1676 r = read_one_line_file(p, &stable_secret);
1677
1678 if (r < 0)
1679 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1680 else
1681 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1682 }
1683 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1684 if (r < 0)
1685 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1686
1687 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
1688 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
1689 if (r < 0)
1690 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
1691 }
1692
1693 r = sd_netlink_message_close_container(req);
1694 if (r < 0)
1695 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1696 }
1697
1698 r = sd_netlink_message_close_container(req);
1699 if (r < 0)
1700 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1701
1702 r = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
1703 if (r < 0)
1704 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1705
1706 link_ref(link);
1707
1708 return 0;
1709 }
1710
1711 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1712 _cleanup_link_unref_ Link *link = userdata;
1713 int r;
1714
1715 assert(link);
1716
1717 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1718 return 1;
1719
1720 r = sd_netlink_message_get_errno(m);
1721 if (r < 0)
1722 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1723
1724 return 1;
1725 }
1726
1727 static int link_down(Link *link) {
1728 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1729 int r;
1730
1731 assert(link);
1732 assert(link->manager);
1733 assert(link->manager->rtnl);
1734
1735 log_link_debug(link, "Bringing link down");
1736
1737 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1738 RTM_SETLINK, link->ifindex);
1739 if (r < 0)
1740 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1741
1742 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1743 if (r < 0)
1744 return log_link_error_errno(link, r, "Could not set link flags: %m");
1745
1746 r = sd_netlink_call_async(link->manager->rtnl, req, link_down_handler, link, 0, NULL);
1747 if (r < 0)
1748 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1749
1750 link_ref(link);
1751
1752 return 0;
1753 }
1754
1755 static int link_up_can(Link *link) {
1756 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1757 int r;
1758
1759 assert(link);
1760
1761 log_link_debug(link, "Bringing CAN link up");
1762
1763 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1764 if (r < 0)
1765 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1766
1767 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1768 if (r < 0)
1769 return log_link_error_errno(link, r, "Could not set link flags: %m");
1770
1771 r = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
1772 if (r < 0)
1773 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1774
1775 link_ref(link);
1776
1777 return 0;
1778 }
1779
1780 static int link_handle_bound_to_list(Link *link) {
1781 Link *l;
1782 Iterator i;
1783 int r;
1784 bool required_up = false;
1785 bool link_is_up = false;
1786
1787 assert(link);
1788
1789 if (hashmap_isempty(link->bound_to_links))
1790 return 0;
1791
1792 if (link->flags & IFF_UP)
1793 link_is_up = true;
1794
1795 HASHMAP_FOREACH (l, link->bound_to_links, i)
1796 if (link_has_carrier(l)) {
1797 required_up = true;
1798 break;
1799 }
1800
1801 if (!required_up && link_is_up) {
1802 r = link_down(link);
1803 if (r < 0)
1804 return r;
1805 } else if (required_up && !link_is_up) {
1806 r = link_up(link);
1807 if (r < 0)
1808 return r;
1809 }
1810
1811 return 0;
1812 }
1813
1814 static int link_handle_bound_by_list(Link *link) {
1815 Iterator i;
1816 Link *l;
1817 int r;
1818
1819 assert(link);
1820
1821 if (hashmap_isempty(link->bound_by_links))
1822 return 0;
1823
1824 HASHMAP_FOREACH (l, link->bound_by_links, i) {
1825 r = link_handle_bound_to_list(l);
1826 if (r < 0)
1827 return r;
1828 }
1829
1830 return 0;
1831 }
1832
1833 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1834 int r;
1835
1836 assert(link);
1837 assert(carrier);
1838
1839 if (link == carrier)
1840 return 0;
1841
1842 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1843 return 0;
1844
1845 r = hashmap_ensure_allocated(h, NULL);
1846 if (r < 0)
1847 return r;
1848
1849 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1850 if (r < 0)
1851 return r;
1852
1853 return 0;
1854 }
1855
1856 static int link_new_bound_by_list(Link *link) {
1857 Manager *m;
1858 Link *carrier;
1859 Iterator i;
1860 int r;
1861 bool list_updated = false;
1862
1863 assert(link);
1864 assert(link->manager);
1865
1866 m = link->manager;
1867
1868 HASHMAP_FOREACH(carrier, m->links, i) {
1869 if (!carrier->network)
1870 continue;
1871
1872 if (strv_isempty(carrier->network->bind_carrier))
1873 continue;
1874
1875 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
1876 r = link_put_carrier(link, carrier, &link->bound_by_links);
1877 if (r < 0)
1878 return r;
1879
1880 list_updated = true;
1881 }
1882 }
1883
1884 if (list_updated)
1885 link_dirty(link);
1886
1887 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
1888 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1889 if (r < 0)
1890 return r;
1891
1892 link_dirty(carrier);
1893 }
1894
1895 return 0;
1896 }
1897
1898 static int link_new_bound_to_list(Link *link) {
1899 Manager *m;
1900 Link *carrier;
1901 Iterator i;
1902 int r;
1903 bool list_updated = false;
1904
1905 assert(link);
1906 assert(link->manager);
1907
1908 if (!link->network)
1909 return 0;
1910
1911 if (strv_isempty(link->network->bind_carrier))
1912 return 0;
1913
1914 m = link->manager;
1915
1916 HASHMAP_FOREACH (carrier, m->links, i) {
1917 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
1918 r = link_put_carrier(link, carrier, &link->bound_to_links);
1919 if (r < 0)
1920 return r;
1921
1922 list_updated = true;
1923 }
1924 }
1925
1926 if (list_updated)
1927 link_dirty(link);
1928
1929 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
1930 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
1931 if (r < 0)
1932 return r;
1933
1934 link_dirty(carrier);
1935 }
1936
1937 return 0;
1938 }
1939
1940 static int link_new_carrier_maps(Link *link) {
1941 int r;
1942
1943 r = link_new_bound_by_list(link);
1944 if (r < 0)
1945 return r;
1946
1947 r = link_handle_bound_by_list(link);
1948 if (r < 0)
1949 return r;
1950
1951 r = link_new_bound_to_list(link);
1952 if (r < 0)
1953 return r;
1954
1955 r = link_handle_bound_to_list(link);
1956 if (r < 0)
1957 return r;
1958
1959 return 0;
1960 }
1961
1962 static void link_free_bound_to_list(Link *link) {
1963 Link *bound_to;
1964 Iterator i;
1965
1966 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
1967 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
1968
1969 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
1970 link_dirty(bound_to);
1971 }
1972
1973 return;
1974 }
1975
1976 static void link_free_bound_by_list(Link *link) {
1977 Link *bound_by;
1978 Iterator i;
1979
1980 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
1981 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
1982
1983 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
1984 link_dirty(bound_by);
1985 link_handle_bound_to_list(bound_by);
1986 }
1987 }
1988
1989 return;
1990 }
1991
1992 static void link_free_carrier_maps(Link *link) {
1993 bool list_updated = false;
1994
1995 assert(link);
1996
1997 if (!hashmap_isempty(link->bound_to_links)) {
1998 link_free_bound_to_list(link);
1999 list_updated = true;
2000 }
2001
2002 if (!hashmap_isempty(link->bound_by_links)) {
2003 link_free_bound_by_list(link);
2004 list_updated = true;
2005 }
2006
2007 if (list_updated)
2008 link_dirty(link);
2009
2010 return;
2011 }
2012
2013 void link_drop(Link *link) {
2014 if (!link || link->state == LINK_STATE_LINGER)
2015 return;
2016
2017 link_set_state(link, LINK_STATE_LINGER);
2018
2019 link_free_carrier_maps(link);
2020
2021 log_link_debug(link, "Link removed");
2022
2023 (void)unlink(link->state_file);
2024 link_unref(link);
2025
2026 return;
2027 }
2028
2029 static int link_joined(Link *link) {
2030 int r;
2031
2032 assert(link);
2033 assert(link->network);
2034
2035 if (!hashmap_isempty(link->bound_to_links)) {
2036 r = link_handle_bound_to_list(link);
2037 if (r < 0)
2038 return r;
2039 } else if (!(link->flags & IFF_UP)) {
2040 r = link_up(link);
2041 if (r < 0) {
2042 link_enter_failed(link);
2043 return r;
2044 }
2045 }
2046
2047 if (link->network->bridge) {
2048 r = link_set_bridge(link);
2049 if (r < 0)
2050 log_link_error_errno(link, r, "Could not set bridge message: %m");
2051 }
2052
2053 if (link->network->bond) {
2054 r = link_bond_set(link);
2055 if (r < 0)
2056 log_link_error_errno(link, r, "Could not set bond message: %m");
2057 }
2058
2059 if (link->network->use_br_vlan &&
2060 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2061 r = link_set_bridge_vlan(link);
2062 if (r < 0)
2063 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2064 }
2065
2066 return link_enter_set_addresses(link);
2067 }
2068
2069 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
2070 _cleanup_link_unref_ Link *link = userdata;
2071 int r;
2072
2073 assert(link);
2074 assert(link->network);
2075
2076 link->enslaving--;
2077
2078 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2079 return 1;
2080
2081 r = sd_netlink_message_get_errno(m);
2082 if (r < 0 && r != -EEXIST) {
2083 log_link_error_errno(link, r, "Could not join netdev: %m");
2084 link_enter_failed(link);
2085 return 1;
2086 } else
2087 log_link_debug(link, "Joined netdev");
2088
2089 if (link->enslaving <= 0)
2090 link_joined(link);
2091
2092 return 1;
2093 }
2094
2095 static int link_enter_join_netdev(Link *link) {
2096 NetDev *netdev;
2097 Iterator i;
2098 int r;
2099
2100 assert(link);
2101 assert(link->network);
2102 assert(link->state == LINK_STATE_PENDING);
2103
2104 link_set_state(link, LINK_STATE_ENSLAVING);
2105
2106 link_dirty(link);
2107
2108 if (!link->network->bridge &&
2109 !link->network->bond &&
2110 !link->network->vrf &&
2111 hashmap_isempty(link->network->stacked_netdevs))
2112 return link_joined(link);
2113
2114 if (link->network->bond) {
2115 log_struct(LOG_DEBUG,
2116 LOG_LINK_INTERFACE(link),
2117 LOG_NETDEV_INTERFACE(link->network->bond),
2118 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname),
2119 NULL);
2120
2121 r = netdev_join(link->network->bond, link, netdev_join_handler);
2122 if (r < 0) {
2123 log_struct_errno(LOG_WARNING, r,
2124 LOG_LINK_INTERFACE(link),
2125 LOG_NETDEV_INTERFACE(link->network->bond),
2126 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname),
2127 NULL);
2128
2129 link_enter_failed(link);
2130 return r;
2131 }
2132
2133 link->enslaving++;
2134 }
2135
2136 if (link->network->bridge) {
2137 log_struct(LOG_DEBUG,
2138 LOG_LINK_INTERFACE(link),
2139 LOG_NETDEV_INTERFACE(link->network->bridge),
2140 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname),
2141 NULL);
2142
2143 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2144 if (r < 0) {
2145 log_struct_errno(LOG_WARNING, r,
2146 LOG_LINK_INTERFACE(link),
2147 LOG_NETDEV_INTERFACE(link->network->bridge),
2148 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname),
2149 NULL),
2150 link_enter_failed(link);
2151 return r;
2152 }
2153
2154 link->enslaving++;
2155 }
2156
2157 if (link->network->vrf) {
2158 log_struct(LOG_DEBUG,
2159 LOG_LINK_INTERFACE(link),
2160 LOG_NETDEV_INTERFACE(link->network->vrf),
2161 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname),
2162 NULL);
2163 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2164 if (r < 0) {
2165 log_struct_errno(LOG_WARNING, r,
2166 LOG_LINK_INTERFACE(link),
2167 LOG_NETDEV_INTERFACE(link->network->vrf),
2168 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname),
2169 NULL);
2170 link_enter_failed(link);
2171 return r;
2172 }
2173
2174 link->enslaving++;
2175 }
2176
2177 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2178
2179 log_struct(LOG_DEBUG,
2180 LOG_LINK_INTERFACE(link),
2181 LOG_NETDEV_INTERFACE(netdev),
2182 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname),
2183 NULL);
2184
2185 r = netdev_join(netdev, link, netdev_join_handler);
2186 if (r < 0) {
2187 log_struct_errno(LOG_WARNING, r,
2188 LOG_LINK_INTERFACE(link),
2189 LOG_NETDEV_INTERFACE(netdev),
2190 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname),
2191 NULL);
2192 link_enter_failed(link);
2193 return r;
2194 }
2195
2196 link->enslaving++;
2197 }
2198
2199 return 0;
2200 }
2201
2202 static int link_set_ipv4_forward(Link *link) {
2203 int r;
2204
2205 if (!link_ipv4_forward_enabled(link))
2206 return 0;
2207
2208 /* We propagate the forwarding flag from one interface to the
2209 * global setting one way. This means: as long as at least one
2210 * interface was configured at any time that had IP forwarding
2211 * enabled the setting will stay on for good. We do this
2212 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2213 * somewhat in sync (see below). */
2214
2215 r = write_string_file("/proc/sys/net/ipv4/ip_forward", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2216 if (r < 0)
2217 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2218
2219 return 0;
2220 }
2221
2222 static int link_set_ipv6_forward(Link *link) {
2223 int r;
2224
2225 if (!link_ipv6_forward_enabled(link))
2226 return 0;
2227
2228 /* On Linux, the IPv6 stack does not know a per-interface
2229 * packet forwarding setting: either packet forwarding is on
2230 * for all, or off for all. We hence don't bother with a
2231 * per-interface setting, but simply propagate the interface
2232 * flag, if it is set, to the global flag, one-way. Note that
2233 * while IPv4 would allow a per-interface flag, we expose the
2234 * same behaviour there and also propagate the setting from
2235 * one to all, to keep things simple (see above). */
2236
2237 r = write_string_file("/proc/sys/net/ipv6/conf/all/forwarding", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2238 if (r < 0)
2239 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2240
2241 return 0;
2242 }
2243
2244 static int link_set_ipv6_privacy_extensions(Link *link) {
2245 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2246 IPv6PrivacyExtensions s;
2247 const char *p = NULL;
2248 int r;
2249
2250 s = link_ipv6_privacy_extensions(link);
2251 if (s < 0)
2252 return 0;
2253
2254 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/use_tempaddr");
2255 xsprintf(buf, "%u", (unsigned) link->network->ipv6_privacy_extensions);
2256
2257 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2258 if (r < 0)
2259 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2260
2261 return 0;
2262 }
2263
2264 static int link_set_ipv6_accept_ra(Link *link) {
2265 const char *p = NULL;
2266 int r;
2267
2268 /* Make this a NOP if IPv6 is not available */
2269 if (!socket_ipv6_is_supported())
2270 return 0;
2271
2272 if (link->flags & IFF_LOOPBACK)
2273 return 0;
2274
2275 if (!link->network)
2276 return 0;
2277
2278 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/accept_ra");
2279
2280 /* We handle router advertisements ourselves, tell the kernel to GTFO */
2281 r = write_string_file(p, "0", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2282 if (r < 0)
2283 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2284
2285 return 0;
2286 }
2287
2288 static int link_set_ipv6_dad_transmits(Link *link) {
2289 char buf[DECIMAL_STR_MAX(int) + 1];
2290 const char *p = NULL;
2291 int r;
2292
2293 /* Make this a NOP if IPv6 is not available */
2294 if (!socket_ipv6_is_supported())
2295 return 0;
2296
2297 if (link->flags & IFF_LOOPBACK)
2298 return 0;
2299
2300 if (!link->network)
2301 return 0;
2302
2303 if (link->network->ipv6_dad_transmits < 0)
2304 return 0;
2305
2306 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/dad_transmits");
2307 xsprintf(buf, "%i", link->network->ipv6_dad_transmits);
2308
2309 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2310 if (r < 0)
2311 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2312
2313 return 0;
2314 }
2315
2316 static int link_set_ipv6_hop_limit(Link *link) {
2317 char buf[DECIMAL_STR_MAX(int) + 1];
2318 const char *p = NULL;
2319 int r;
2320
2321 /* Make this a NOP if IPv6 is not available */
2322 if (!socket_ipv6_is_supported())
2323 return 0;
2324
2325 if (link->flags & IFF_LOOPBACK)
2326 return 0;
2327
2328 if (!link->network)
2329 return 0;
2330
2331 if (link->network->ipv6_hop_limit < 0)
2332 return 0;
2333
2334 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/hop_limit");
2335 xsprintf(buf, "%i", link->network->ipv6_hop_limit);
2336
2337 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2338 if (r < 0)
2339 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2340
2341 return 0;
2342 }
2343
2344 static int link_drop_foreign_config(Link *link) {
2345 Address *address;
2346 Route *route;
2347 Iterator i;
2348 int r;
2349
2350 SET_FOREACH(address, link->addresses_foreign, i) {
2351 /* we consider IPv6LL addresses to be managed by the kernel */
2352 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2353 continue;
2354
2355 r = address_remove(address, link, link_address_remove_handler);
2356 if (r < 0)
2357 return r;
2358 }
2359
2360 SET_FOREACH(route, link->routes_foreign, i) {
2361 /* do not touch routes managed by the kernel */
2362 if (route->protocol == RTPROT_KERNEL)
2363 continue;
2364
2365 r = route_remove(route, link, link_route_remove_handler);
2366 if (r < 0)
2367 return r;
2368 }
2369
2370 return 0;
2371 }
2372
2373 static int link_drop_config(Link *link) {
2374 Address *address;
2375 Route *route;
2376 Iterator i;
2377 int r;
2378
2379 SET_FOREACH(address, link->addresses, i) {
2380 /* we consider IPv6LL addresses to be managed by the kernel */
2381 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2382 continue;
2383
2384 r = address_remove(address, link, link_address_remove_handler);
2385 if (r < 0)
2386 return r;
2387 }
2388
2389 SET_FOREACH(route, link->routes, i) {
2390 /* do not touch routes managed by the kernel */
2391 if (route->protocol == RTPROT_KERNEL)
2392 continue;
2393
2394 r = route_remove(route, link, link_route_remove_handler);
2395 if (r < 0)
2396 return r;
2397 }
2398
2399 ndisc_flush(link);
2400
2401 return 0;
2402 }
2403
2404 static int link_update_lldp(Link *link) {
2405 int r;
2406
2407 assert(link);
2408
2409 if (!link->lldp)
2410 return 0;
2411
2412 if (link->flags & IFF_UP) {
2413 r = sd_lldp_start(link->lldp);
2414 if (r > 0)
2415 log_link_debug(link, "Started LLDP.");
2416 } else {
2417 r = sd_lldp_stop(link->lldp);
2418 if (r > 0)
2419 log_link_debug(link, "Stopped LLDP.");
2420 }
2421
2422 return r;
2423 }
2424
2425 static int link_configure(Link *link) {
2426 int r;
2427
2428 assert(link);
2429 assert(link->network);
2430 assert(link->state == LINK_STATE_PENDING);
2431
2432 if (streq_ptr(link->kind, "vcan")) {
2433
2434 if (!(link->flags & IFF_UP)) {
2435 r = link_up_can(link);
2436 if (r < 0) {
2437 link_enter_failed(link);
2438 return r;
2439 }
2440 }
2441
2442 return 0;
2443 }
2444
2445 /* Drop foreign config, but ignore loopback or critical devices.
2446 * We do not want to remove loopback address or addresses used for root NFS. */
2447 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2448 r = link_drop_foreign_config(link);
2449 if (r < 0)
2450 return r;
2451 }
2452
2453 r = link_set_proxy_arp(link);
2454 if (r < 0)
2455 return r;
2456
2457 r = ipv6_proxy_ndp_addresses_configure(link);
2458 if (r < 0)
2459 return r;
2460
2461 r = link_set_ipv4_forward(link);
2462 if (r < 0)
2463 return r;
2464
2465 r = link_set_ipv6_forward(link);
2466 if (r < 0)
2467 return r;
2468
2469 r = link_set_ipv6_privacy_extensions(link);
2470 if (r < 0)
2471 return r;
2472
2473 r = link_set_ipv6_accept_ra(link);
2474 if (r < 0)
2475 return r;
2476
2477 r = link_set_ipv6_dad_transmits(link);
2478 if (r < 0)
2479 return r;
2480
2481 r = link_set_ipv6_hop_limit(link);
2482 if (r < 0)
2483 return r;
2484
2485 r = link_set_flags(link);
2486 if (r < 0)
2487 return r;
2488
2489 if (link_ipv4ll_enabled(link)) {
2490 r = ipv4ll_configure(link);
2491 if (r < 0)
2492 return r;
2493 }
2494
2495 if (link_dhcp4_enabled(link)) {
2496 r = dhcp4_configure(link);
2497 if (r < 0)
2498 return r;
2499 }
2500
2501 if (link_dhcp4_server_enabled(link)) {
2502 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2503 if (r < 0)
2504 return r;
2505
2506 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2507 if (r < 0)
2508 return r;
2509 }
2510
2511 if (link_dhcp6_enabled(link) ||
2512 link_ipv6_accept_ra_enabled(link)) {
2513 r = dhcp6_configure(link);
2514 if (r < 0)
2515 return r;
2516 }
2517
2518 if (link_ipv6_accept_ra_enabled(link)) {
2519 r = ndisc_configure(link);
2520 if (r < 0)
2521 return r;
2522 }
2523
2524 if (link_lldp_rx_enabled(link)) {
2525 r = sd_lldp_new(&link->lldp);
2526 if (r < 0)
2527 return r;
2528
2529 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
2530 if (r < 0)
2531 return r;
2532
2533 r = sd_lldp_match_capabilities(link->lldp,
2534 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
2535 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
2536 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
2537 if (r < 0)
2538 return r;
2539
2540 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
2541 if (r < 0)
2542 return r;
2543
2544 r = sd_lldp_attach_event(link->lldp, NULL, 0);
2545 if (r < 0)
2546 return r;
2547
2548 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
2549 if (r < 0)
2550 return r;
2551
2552 r = link_update_lldp(link);
2553 if (r < 0)
2554 return r;
2555 }
2556
2557 if (link_has_carrier(link)) {
2558 r = link_acquire_conf(link);
2559 if (r < 0)
2560 return r;
2561 }
2562
2563 return link_enter_join_netdev(link);
2564 }
2565
2566 static int link_initialized_and_synced(sd_netlink *rtnl, sd_netlink_message *m,
2567 void *userdata) {
2568 _cleanup_link_unref_ Link *link = userdata;
2569 Network *network;
2570 int r;
2571
2572 assert(link);
2573 assert(link->ifname);
2574 assert(link->manager);
2575
2576 if (link->state != LINK_STATE_PENDING)
2577 return 1;
2578
2579 log_link_debug(link, "Link state is up-to-date");
2580
2581 r = link_new_bound_by_list(link);
2582 if (r < 0)
2583 return r;
2584
2585 r = link_handle_bound_by_list(link);
2586 if (r < 0)
2587 return r;
2588
2589 if (!link->network) {
2590 r = network_get(link->manager, link->udev_device, link->ifname,
2591 &link->mac, &network);
2592 if (r == -ENOENT) {
2593 link_enter_unmanaged(link);
2594 return 1;
2595 } else if (r == 0 && network->unmanaged) {
2596 link_enter_unmanaged(link);
2597 return 0;
2598 } else if (r < 0)
2599 return r;
2600
2601 if (link->flags & IFF_LOOPBACK) {
2602 if (network->link_local != ADDRESS_FAMILY_NO)
2603 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2604
2605 if (network->dhcp != ADDRESS_FAMILY_NO)
2606 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2607
2608 if (network->dhcp_server)
2609 log_link_debug(link, "Ignoring DHCP server for loopback link");
2610 }
2611
2612 r = network_apply(network, link);
2613 if (r < 0)
2614 return r;
2615 }
2616
2617 r = link_new_bound_to_list(link);
2618 if (r < 0)
2619 return r;
2620
2621 r = link_configure(link);
2622 if (r < 0)
2623 return r;
2624
2625 return 1;
2626 }
2627
2628 int link_initialized(Link *link, struct udev_device *device) {
2629 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2630 int r;
2631
2632 assert(link);
2633 assert(link->manager);
2634 assert(link->manager->rtnl);
2635 assert(device);
2636
2637 if (link->state != LINK_STATE_PENDING)
2638 return 0;
2639
2640 if (link->udev_device)
2641 return 0;
2642
2643 log_link_debug(link, "udev initialized link");
2644
2645 link->udev_device = udev_device_ref(device);
2646
2647 /* udev has initialized the link, but we don't know if we have yet
2648 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2649 * when it returns we know that the pending NEWLINKs have already been
2650 * processed and that we are up-to-date */
2651
2652 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2653 link->ifindex);
2654 if (r < 0)
2655 return r;
2656
2657 r = sd_netlink_call_async(link->manager->rtnl, req,
2658 link_initialized_and_synced, link, 0, NULL);
2659 if (r < 0)
2660 return r;
2661
2662 link_ref(link);
2663
2664 return 0;
2665 }
2666
2667 static int link_load(Link *link) {
2668 _cleanup_free_ char *network_file = NULL,
2669 *addresses = NULL,
2670 *routes = NULL,
2671 *dhcp4_address = NULL,
2672 *ipv4ll_address = NULL;
2673 union in_addr_union address;
2674 union in_addr_union route_dst;
2675 const char *p;
2676 int r;
2677
2678 assert(link);
2679
2680 r = parse_env_file(link->state_file, NEWLINE,
2681 "NETWORK_FILE", &network_file,
2682 "ADDRESSES", &addresses,
2683 "ROUTES", &routes,
2684 "DHCP4_ADDRESS", &dhcp4_address,
2685 "IPV4LL_ADDRESS", &ipv4ll_address,
2686 NULL);
2687 if (r < 0 && r != -ENOENT)
2688 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
2689
2690 if (network_file) {
2691 Network *network;
2692 char *suffix;
2693
2694 /* drop suffix */
2695 suffix = strrchr(network_file, '.');
2696 if (!suffix) {
2697 log_link_debug(link, "Failed to get network name from %s", network_file);
2698 goto network_file_fail;
2699 }
2700 *suffix = '\0';
2701
2702 r = network_get_by_name(link->manager, basename(network_file), &network);
2703 if (r < 0) {
2704 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
2705 goto network_file_fail;
2706 }
2707
2708 r = network_apply(network, link);
2709 if (r < 0)
2710 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
2711 }
2712
2713 network_file_fail:
2714
2715 if (addresses) {
2716 p = addresses;
2717
2718 for (;;) {
2719 _cleanup_free_ char *address_str = NULL;
2720 char *prefixlen_str;
2721 int family;
2722 unsigned char prefixlen;
2723
2724 r = extract_first_word(&p, &address_str, NULL, 0);
2725 if (r < 0) {
2726 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
2727 continue;
2728 }
2729 if (r == 0)
2730 break;
2731
2732 prefixlen_str = strchr(address_str, '/');
2733 if (!prefixlen_str) {
2734 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
2735 continue;
2736 }
2737
2738 *prefixlen_str++ = '\0';
2739
2740 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
2741 if (r != 1) {
2742 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
2743 continue;
2744 }
2745
2746 r = in_addr_from_string_auto(address_str, &family, &address);
2747 if (r < 0) {
2748 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
2749 continue;
2750 }
2751
2752 r = address_add(link, family, &address, prefixlen, NULL);
2753 if (r < 0)
2754 return log_link_error_errno(link, r, "Failed to add address: %m");
2755 }
2756 }
2757
2758 if (routes) {
2759 p = routes;
2760
2761 for (;;) {
2762 Route *route;
2763 _cleanup_free_ char *route_str = NULL;
2764 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
2765 usec_t lifetime;
2766 char *prefixlen_str;
2767 int family;
2768 unsigned char prefixlen, tos, table;
2769 uint32_t priority;
2770
2771 r = extract_first_word(&p, &route_str, NULL, 0);
2772 if (r < 0) {
2773 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
2774 continue;
2775 }
2776 if (r == 0)
2777 break;
2778
2779 prefixlen_str = strchr(route_str, '/');
2780 if (!prefixlen_str) {
2781 log_link_debug(link, "Failed to parse route %s", route_str);
2782 continue;
2783 }
2784
2785 *prefixlen_str++ = '\0';
2786
2787 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
2788 if (r != 5) {
2789 log_link_debug(link,
2790 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
2791 prefixlen_str);
2792 continue;
2793 }
2794
2795 r = in_addr_from_string_auto(route_str, &family, &route_dst);
2796 if (r < 0) {
2797 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
2798 continue;
2799 }
2800
2801 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
2802 if (r < 0)
2803 return log_link_error_errno(link, r, "Failed to add route: %m");
2804
2805 if (lifetime != USEC_INFINITY) {
2806 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
2807 0, route_expire_handler, route);
2808 if (r < 0)
2809 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
2810 }
2811
2812 route->lifetime = lifetime;
2813 sd_event_source_unref(route->expire);
2814 route->expire = expire;
2815 expire = NULL;
2816 }
2817 }
2818
2819 if (dhcp4_address) {
2820 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
2821 if (r < 0) {
2822 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
2823 goto dhcp4_address_fail;
2824 }
2825
2826 r = sd_dhcp_client_new(&link->dhcp_client);
2827 if (r < 0)
2828 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
2829
2830 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
2831 if (r < 0)
2832 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
2833 }
2834
2835 dhcp4_address_fail:
2836
2837 if (ipv4ll_address) {
2838 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
2839 if (r < 0) {
2840 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
2841 goto ipv4ll_address_fail;
2842 }
2843
2844 r = sd_ipv4ll_new(&link->ipv4ll);
2845 if (r < 0)
2846 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
2847
2848 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
2849 if (r < 0)
2850 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
2851 }
2852
2853 ipv4ll_address_fail:
2854
2855 return 0;
2856 }
2857
2858 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
2859 Link *link;
2860 _cleanup_udev_device_unref_ struct udev_device *device = NULL;
2861 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
2862 int r;
2863
2864 assert(m);
2865 assert(m->rtnl);
2866 assert(message);
2867 assert(ret);
2868
2869 r = link_new(m, message, ret);
2870 if (r < 0)
2871 return r;
2872
2873 link = *ret;
2874
2875 log_link_debug(link, "Link %d added", link->ifindex);
2876
2877 r = link_load(link);
2878 if (r < 0)
2879 return r;
2880
2881 if (detect_container() <= 0) {
2882 /* not in a container, udev will be around */
2883 sprintf(ifindex_str, "n%d", link->ifindex);
2884 device = udev_device_new_from_device_id(m->udev, ifindex_str);
2885 if (!device) {
2886 r = log_link_warning_errno(link, errno, "Could not find udev device: %m");
2887 goto failed;
2888 }
2889
2890 if (udev_device_get_is_initialized(device) <= 0) {
2891 /* not yet ready */
2892 log_link_debug(link, "link pending udev initialization...");
2893 return 0;
2894 }
2895
2896 r = link_initialized(link, device);
2897 if (r < 0)
2898 goto failed;
2899 } else {
2900 /* we are calling a callback directly, so must take a ref */
2901 link_ref(link);
2902
2903 r = link_initialized_and_synced(m->rtnl, NULL, link);
2904 if (r < 0)
2905 goto failed;
2906 }
2907
2908 return 0;
2909 failed:
2910 link_enter_failed(link);
2911 return r;
2912 }
2913
2914 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
2915 int r;
2916
2917 assert(link);
2918
2919 log_link_info(link, "Gained IPv6LL");
2920
2921 link->ipv6ll_address = *address;
2922 link_check_ready(link);
2923
2924 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
2925 r = link_acquire_ipv6_conf(link);
2926 if (r < 0) {
2927 link_enter_failed(link);
2928 return r;
2929 }
2930 }
2931
2932 return 0;
2933 }
2934
2935 static int link_carrier_gained(Link *link) {
2936 int r;
2937
2938 assert(link);
2939
2940 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
2941 r = link_acquire_conf(link);
2942 if (r < 0) {
2943 link_enter_failed(link);
2944 return r;
2945 }
2946
2947 r = link_enter_set_addresses(link);
2948 if (r < 0)
2949 return r;
2950 }
2951
2952 r = link_handle_bound_by_list(link);
2953 if (r < 0)
2954 return r;
2955
2956 return 0;
2957 }
2958
2959 static int link_carrier_lost(Link *link) {
2960 int r;
2961
2962 assert(link);
2963
2964 r = link_stop_clients(link);
2965 if (r < 0) {
2966 link_enter_failed(link);
2967 return r;
2968 }
2969
2970 r = link_drop_config(link);
2971 if (r < 0)
2972 return r;
2973
2974 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
2975 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
2976 r = link_drop_foreign_config(link);
2977 if (r < 0)
2978 return r;
2979 }
2980
2981 r = link_handle_bound_by_list(link);
2982 if (r < 0)
2983 return r;
2984
2985 return 0;
2986 }
2987
2988 int link_carrier_reset(Link *link) {
2989 int r;
2990
2991 assert(link);
2992
2993 if (link_has_carrier(link)) {
2994 r = link_carrier_lost(link);
2995 if (r < 0)
2996 return r;
2997
2998 r = link_carrier_gained(link);
2999 if (r < 0)
3000 return r;
3001
3002 log_link_info(link, "Reset carrier");
3003 }
3004
3005 return 0;
3006 }
3007
3008 int link_update(Link *link, sd_netlink_message *m) {
3009 struct ether_addr mac;
3010 const char *ifname;
3011 uint32_t mtu;
3012 bool had_carrier, carrier_gained, carrier_lost;
3013 int r;
3014
3015 assert(link);
3016 assert(link->ifname);
3017 assert(m);
3018
3019 if (link->state == LINK_STATE_LINGER) {
3020 link_ref(link);
3021 log_link_info(link, "Link readded");
3022 link_set_state(link, LINK_STATE_ENSLAVING);
3023
3024 r = link_new_carrier_maps(link);
3025 if (r < 0)
3026 return r;
3027 }
3028
3029 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3030 if (r >= 0 && !streq(ifname, link->ifname)) {
3031 log_link_info(link, "Renamed to %s", ifname);
3032
3033 link_free_carrier_maps(link);
3034
3035 r = free_and_strdup(&link->ifname, ifname);
3036 if (r < 0)
3037 return r;
3038
3039 r = link_new_carrier_maps(link);
3040 if (r < 0)
3041 return r;
3042 }
3043
3044 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3045 if (r >= 0 && mtu > 0) {
3046 link->mtu = mtu;
3047 if (!link->original_mtu) {
3048 link->original_mtu = mtu;
3049 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3050 }
3051
3052 if (link->dhcp_client) {
3053 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3054 link->mtu);
3055 if (r < 0) {
3056 log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3057 return r;
3058 }
3059 }
3060 }
3061
3062 /* The kernel may broadcast NEWLINK messages without the MAC address
3063 set, simply ignore them. */
3064 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3065 if (r >= 0) {
3066 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3067 ETH_ALEN)) {
3068
3069 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3070 ETH_ALEN);
3071
3072 log_link_debug(link, "MAC address: "
3073 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3074 mac.ether_addr_octet[0],
3075 mac.ether_addr_octet[1],
3076 mac.ether_addr_octet[2],
3077 mac.ether_addr_octet[3],
3078 mac.ether_addr_octet[4],
3079 mac.ether_addr_octet[5]);
3080
3081 if (link->ipv4ll) {
3082 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3083 if (r < 0)
3084 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3085 }
3086
3087 if (link->dhcp_client) {
3088 const DUID *duid = link_duid(link);
3089
3090 r = sd_dhcp_client_set_mac(link->dhcp_client,
3091 (const uint8_t *) &link->mac,
3092 sizeof (link->mac),
3093 ARPHRD_ETHER);
3094 if (r < 0)
3095 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3096
3097 r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
3098 link->network->iaid,
3099 duid->type,
3100 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3101 duid->raw_data_len);
3102 if (r < 0)
3103 return log_link_warning_errno(link, r, "Could not update DUID/IAID in DHCP client: %m");
3104 }
3105
3106 if (link->dhcp6_client) {
3107 const DUID* duid = link_duid(link);
3108
3109 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3110 (const uint8_t *) &link->mac,
3111 sizeof (link->mac),
3112 ARPHRD_ETHER);
3113 if (r < 0)
3114 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3115
3116 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3117 link->network->iaid);
3118 if (r < 0)
3119 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3120
3121 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
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 DHCPv6 DUID: %m");
3127 }
3128 }
3129 }
3130
3131 had_carrier = link_has_carrier(link);
3132
3133 r = link_update_flags(link, m);
3134 if (r < 0)
3135 return r;
3136
3137 r = link_update_lldp(link);
3138 if (r < 0)
3139 return r;
3140
3141 carrier_gained = !had_carrier && link_has_carrier(link);
3142 carrier_lost = had_carrier && !link_has_carrier(link);
3143
3144 if (carrier_gained) {
3145 log_link_info(link, "Gained carrier");
3146
3147 r = link_carrier_gained(link);
3148 if (r < 0)
3149 return r;
3150 } else if (carrier_lost) {
3151 log_link_info(link, "Lost carrier");
3152
3153 r = link_carrier_lost(link);
3154 if (r < 0)
3155 return r;
3156 }
3157
3158 return 0;
3159 }
3160
3161 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3162 bool space = false;
3163 Iterator i;
3164 Link *link;
3165
3166 assert(f);
3167 assert(prefix);
3168
3169 if (hashmap_isempty(h))
3170 return;
3171
3172 fputs(prefix, f);
3173 HASHMAP_FOREACH(link, h, i) {
3174 if (space)
3175 fputc(' ', f);
3176
3177 fprintf(f, "%i", link->ifindex);
3178 space = true;
3179 }
3180
3181 fputc('\n', f);
3182 }
3183
3184 int link_save(Link *link) {
3185 _cleanup_free_ char *temp_path = NULL;
3186 _cleanup_fclose_ FILE *f = NULL;
3187 const char *admin_state, *oper_state;
3188 Address *a;
3189 Route *route;
3190 Iterator i;
3191 int r;
3192
3193 assert(link);
3194 assert(link->state_file);
3195 assert(link->lease_file);
3196 assert(link->manager);
3197
3198 if (link->state == LINK_STATE_LINGER) {
3199 unlink(link->state_file);
3200 return 0;
3201 }
3202
3203 link_lldp_save(link);
3204
3205 admin_state = link_state_to_string(link->state);
3206 assert(admin_state);
3207
3208 oper_state = link_operstate_to_string(link->operstate);
3209 assert(oper_state);
3210
3211 r = fopen_temporary(link->state_file, &f, &temp_path);
3212 if (r < 0)
3213 goto fail;
3214
3215 (void) fchmod(fileno(f), 0644);
3216
3217 fprintf(f,
3218 "# This is private data. Do not parse.\n"
3219 "ADMIN_STATE=%s\n"
3220 "OPER_STATE=%s\n",
3221 admin_state, oper_state);
3222
3223 if (link->network) {
3224 bool space;
3225 sd_dhcp6_lease *dhcp6_lease = NULL;
3226 const char *dhcp_domainname = NULL;
3227 char **dhcp6_domains = NULL;
3228 unsigned j;
3229
3230 if (link->dhcp6_client) {
3231 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3232 if (r < 0 && r != -ENOMSG)
3233 log_link_debug(link, "No DHCPv6 lease");
3234 }
3235
3236 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3237
3238 fputs("DNS=", f);
3239 space = false;
3240
3241 for (j = 0; j < link->network->n_dns; j++) {
3242 _cleanup_free_ char *b = NULL;
3243
3244 r = in_addr_to_string(link->network->dns[j].family,
3245 &link->network->dns[j].address, &b);
3246 if (r < 0) {
3247 log_debug_errno(r, "Failed to format address, ignoring: %m");
3248 continue;
3249 }
3250
3251 if (space)
3252 fputc(' ', f);
3253 fputs(b, f);
3254 space = true;
3255 }
3256
3257 if (link->network->dhcp_use_dns &&
3258 link->dhcp_lease) {
3259 const struct in_addr *addresses;
3260
3261 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3262 if (r > 0) {
3263 if (space)
3264 fputc(' ', f);
3265 serialize_in_addrs(f, addresses, r);
3266 space = true;
3267 }
3268 }
3269
3270 if (link->network->dhcp_use_dns && dhcp6_lease) {
3271 struct in6_addr *in6_addrs;
3272
3273 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3274 if (r > 0) {
3275 if (space)
3276 fputc(' ', f);
3277 serialize_in6_addrs(f, in6_addrs, r);
3278 space = true;
3279 }
3280 }
3281
3282 /* Make sure to flush out old entries before we use the NDISC data */
3283 ndisc_vacuum(link);
3284
3285 if (link->network->dhcp_use_dns && link->ndisc_rdnss) {
3286 NDiscRDNSS *dd;
3287
3288 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3289 if (space)
3290 fputc(' ', f);
3291
3292 serialize_in6_addrs(f, &dd->address, 1);
3293 space = true;
3294 }
3295 }
3296
3297 fputc('\n', f);
3298
3299 fputs("NTP=", f);
3300 space = false;
3301 fputstrv(f, link->network->ntp, NULL, &space);
3302
3303 if (link->network->dhcp_use_ntp &&
3304 link->dhcp_lease) {
3305 const struct in_addr *addresses;
3306
3307 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3308 if (r > 0) {
3309 if (space)
3310 fputc(' ', f);
3311 serialize_in_addrs(f, addresses, r);
3312 space = true;
3313 }
3314 }
3315
3316 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3317 struct in6_addr *in6_addrs;
3318 char **hosts;
3319
3320 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3321 &in6_addrs);
3322 if (r > 0) {
3323 if (space)
3324 fputc(' ', f);
3325 serialize_in6_addrs(f, in6_addrs, r);
3326 space = true;
3327 }
3328
3329 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3330 if (r > 0)
3331 fputstrv(f, hosts, NULL, &space);
3332 }
3333
3334 fputc('\n', f);
3335
3336 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3337 if (link->dhcp_lease)
3338 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3339 if (dhcp6_lease)
3340 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3341 }
3342
3343 fputs("DOMAINS=", f);
3344 fputstrv(f, link->network->search_domains, NULL, &space);
3345
3346 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3347 NDiscDNSSL *dd;
3348
3349 if (dhcp_domainname)
3350 fputs_with_space(f, dhcp_domainname, NULL, &space);
3351 if (dhcp6_domains)
3352 fputstrv(f, dhcp6_domains, NULL, &space);
3353
3354 SET_FOREACH(dd, link->ndisc_dnssl, i)
3355 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3356 }
3357
3358 fputc('\n', f);
3359
3360 fputs("ROUTE_DOMAINS=", f);
3361 fputstrv(f, link->network->route_domains, NULL, NULL);
3362
3363 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3364 NDiscDNSSL *dd;
3365
3366 if (dhcp_domainname)
3367 fputs_with_space(f, dhcp_domainname, NULL, &space);
3368 if (dhcp6_domains)
3369 fputstrv(f, dhcp6_domains, NULL, &space);
3370
3371 SET_FOREACH(dd, link->ndisc_dnssl, i)
3372 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3373 }
3374
3375 fputc('\n', f);
3376
3377 fprintf(f, "LLMNR=%s\n",
3378 resolve_support_to_string(link->network->llmnr));
3379 fprintf(f, "MDNS=%s\n",
3380 resolve_support_to_string(link->network->mdns));
3381
3382 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3383 fprintf(f, "DNSSEC=%s\n",
3384 dnssec_mode_to_string(link->network->dnssec_mode));
3385
3386 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3387 const char *n;
3388
3389 fputs("DNSSEC_NTA=", f);
3390 space = false;
3391 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3392 fputs_with_space(f, n, NULL, &space);
3393 fputc('\n', f);
3394 }
3395
3396 fputs("ADDRESSES=", f);
3397 space = false;
3398 SET_FOREACH(a, link->addresses, i) {
3399 _cleanup_free_ char *address_str = NULL;
3400
3401 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3402 if (r < 0)
3403 goto fail;
3404
3405 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3406 space = true;
3407 }
3408 fputc('\n', f);
3409
3410 fputs("ROUTES=", f);
3411 space = false;
3412 SET_FOREACH(route, link->routes, i) {
3413 _cleanup_free_ char *route_str = NULL;
3414
3415 r = in_addr_to_string(route->family, &route->dst, &route_str);
3416 if (r < 0)
3417 goto fail;
3418
3419 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%hhu/"USEC_FMT, space ? " " : "", route_str,
3420 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3421 space = true;
3422 }
3423
3424 fputc('\n', f);
3425 }
3426
3427 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3428 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3429
3430 if (link->dhcp_lease) {
3431 struct in_addr address;
3432 const char *tz = NULL;
3433
3434 assert(link->network);
3435
3436 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3437 if (r >= 0)
3438 fprintf(f, "TIMEZONE=%s\n", tz);
3439
3440 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3441 if (r >= 0) {
3442 fputs("DHCP4_ADDRESS=", f);
3443 serialize_in_addrs(f, &address, 1);
3444 fputc('\n', f);
3445 }
3446
3447 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3448 if (r < 0)
3449 goto fail;
3450
3451 fprintf(f,
3452 "DHCP_LEASE=%s\n",
3453 link->lease_file);
3454 } else
3455 unlink(link->lease_file);
3456
3457 if (link->ipv4ll) {
3458 struct in_addr address;
3459
3460 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3461 if (r >= 0) {
3462 fputs("IPV4LL_ADDRESS=", f);
3463 serialize_in_addrs(f, &address, 1);
3464 fputc('\n', f);
3465 }
3466 }
3467
3468 r = fflush_and_check(f);
3469 if (r < 0)
3470 goto fail;
3471
3472 if (rename(temp_path, link->state_file) < 0) {
3473 r = -errno;
3474 goto fail;
3475 }
3476
3477 return 0;
3478
3479 fail:
3480 (void) unlink(link->state_file);
3481 if (temp_path)
3482 (void) unlink(temp_path);
3483
3484 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3485 }
3486
3487 /* The serialized state in /run is no longer up-to-date. */
3488 void link_dirty(Link *link) {
3489 int r;
3490
3491 assert(link);
3492
3493 /* mark manager dirty as link is dirty */
3494 manager_dirty(link->manager);
3495
3496 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3497 if (r < 0)
3498 /* allocation errors are ignored */
3499 return;
3500
3501 r = set_put(link->manager->dirty_links, link);
3502 if (r <= 0)
3503 /* don't take another ref if the link was already dirty */
3504 return;
3505
3506 link_ref(link);
3507 }
3508
3509 /* The serialized state in /run is up-to-date */
3510 void link_clean(Link *link) {
3511 assert(link);
3512 assert(link->manager);
3513
3514 set_remove(link->manager->dirty_links, link);
3515 link_unref(link);
3516 }
3517
3518 static const char* const link_state_table[_LINK_STATE_MAX] = {
3519 [LINK_STATE_PENDING] = "pending",
3520 [LINK_STATE_ENSLAVING] = "configuring",
3521 [LINK_STATE_SETTING_ADDRESSES] = "configuring",
3522 [LINK_STATE_SETTING_ROUTES] = "configuring",
3523 [LINK_STATE_CONFIGURED] = "configured",
3524 [LINK_STATE_UNMANAGED] = "unmanaged",
3525 [LINK_STATE_FAILED] = "failed",
3526 [LINK_STATE_LINGER] = "linger",
3527 };
3528
3529 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
3530
3531 static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
3532 [LINK_OPERSTATE_OFF] = "off",
3533 [LINK_OPERSTATE_NO_CARRIER] = "no-carrier",
3534 [LINK_OPERSTATE_DORMANT] = "dormant",
3535 [LINK_OPERSTATE_CARRIER] = "carrier",
3536 [LINK_OPERSTATE_DEGRADED] = "degraded",
3537 [LINK_OPERSTATE_ROUTABLE] = "routable",
3538 };
3539
3540 DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
Unnamed repository; edit this file 'description' to name the repository.