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[thirdparty/systemd.git] / src / network / networkd-link.c
1 /***
2 This file is part of systemd.
3
4 Copyright 2013 Tom Gundersen <teg@jklm.no>
5
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
10
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
18 ***/
19
20 #include <netinet/ether.h>
21 #include <linux/if.h>
22 #include <unistd.h>
23
24 #include "alloc-util.h"
25 #include "bus-util.h"
26 #include "dhcp-lease-internal.h"
27 #include "fd-util.h"
28 #include "fileio.h"
29 #include "netlink-util.h"
30 #include "network-internal.h"
31 #include "networkd-lldp-tx.h"
32 #include "networkd-ndisc.h"
33 #include "networkd.h"
34 #include "set.h"
35 #include "socket-util.h"
36 #include "stdio-util.h"
37 #include "string-table.h"
38 #include "udev-util.h"
39 #include "util.h"
40 #include "virt.h"
41
42 static bool link_dhcp6_enabled(Link *link) {
43 assert(link);
44
45 if (!socket_ipv6_is_supported())
46 return false;
47
48 if (link->flags & IFF_LOOPBACK)
49 return false;
50
51 if (!link->network)
52 return false;
53
54 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
55 }
56
57 static bool link_dhcp4_enabled(Link *link) {
58 assert(link);
59
60 if (link->flags & IFF_LOOPBACK)
61 return false;
62
63 if (!link->network)
64 return false;
65
66 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
67 }
68
69 static bool link_dhcp4_server_enabled(Link *link) {
70 assert(link);
71
72 if (link->flags & IFF_LOOPBACK)
73 return false;
74
75 if (!link->network)
76 return false;
77
78 return link->network->dhcp_server;
79 }
80
81 static bool link_ipv4ll_enabled(Link *link) {
82 assert(link);
83
84 if (link->flags & IFF_LOOPBACK)
85 return false;
86
87 if (!link->network)
88 return false;
89
90 return link->network->link_local & ADDRESS_FAMILY_IPV4;
91 }
92
93 static bool link_ipv6ll_enabled(Link *link) {
94 assert(link);
95
96 if (!socket_ipv6_is_supported())
97 return false;
98
99 if (link->flags & IFF_LOOPBACK)
100 return false;
101
102 if (!link->network)
103 return false;
104
105 return link->network->link_local & ADDRESS_FAMILY_IPV6;
106 }
107
108 static bool link_ipv6_enabled(Link *link) {
109 assert(link);
110
111 if (!socket_ipv6_is_supported())
112 return false;
113
114 if (link->network->bridge)
115 return false;
116
117 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
118 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
119 }
120
121 static bool link_lldp_rx_enabled(Link *link) {
122 assert(link);
123
124 if (link->flags & IFF_LOOPBACK)
125 return false;
126
127 if (link->iftype != ARPHRD_ETHER)
128 return false;
129
130 if (!link->network)
131 return false;
132
133 if (link->network->bridge)
134 return false;
135
136 return link->network->lldp_mode != LLDP_MODE_NO;
137 }
138
139 static bool link_lldp_emit_enabled(Link *link) {
140 assert(link);
141
142 if (link->flags & IFF_LOOPBACK)
143 return false;
144
145 if (link->iftype != ARPHRD_ETHER)
146 return false;
147
148 if (!link->network)
149 return false;
150
151 return link->network->lldp_emit != LLDP_EMIT_NO;
152 }
153
154 static bool link_ipv4_forward_enabled(Link *link) {
155 assert(link);
156
157 if (link->flags & IFF_LOOPBACK)
158 return false;
159
160 if (!link->network)
161 return false;
162
163 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
164 return false;
165
166 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
167 }
168
169 static bool link_ipv6_forward_enabled(Link *link) {
170 assert(link);
171
172 if (!socket_ipv6_is_supported())
173 return false;
174
175 if (link->flags & IFF_LOOPBACK)
176 return false;
177
178 if (!link->network)
179 return false;
180
181 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
182 return false;
183
184 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
185 }
186
187 static bool link_proxy_arp_enabled(Link *link) {
188 assert(link);
189
190 if (link->flags & IFF_LOOPBACK)
191 return false;
192
193 if (!link->network)
194 return false;
195
196 if (link->network->proxy_arp < 0)
197 return false;
198
199 return true;
200 }
201
202 static bool link_ipv6_accept_ra_enabled(Link *link) {
203 assert(link);
204
205 if (!socket_ipv6_is_supported())
206 return false;
207
208 if (link->flags & IFF_LOOPBACK)
209 return false;
210
211 if (!link->network)
212 return false;
213
214 /* If unset use system default (enabled if local forwarding is disabled.
215 * disabled if local forwarding is enabled).
216 * If set, ignore or enforce RA independent of local forwarding state.
217 */
218 if (link->network->ipv6_accept_ra < 0)
219 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
220 return !link_ipv6_forward_enabled(link);
221 else if (link->network->ipv6_accept_ra > 0)
222 /* accept RA even if ip_forward is enabled */
223 return true;
224 else
225 /* ignore RA */
226 return false;
227 }
228
229 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
230 assert(link);
231
232 if (!socket_ipv6_is_supported())
233 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
234
235 if (link->flags & IFF_LOOPBACK)
236 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
237
238 if (!link->network)
239 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
240
241 return link->network->ipv6_privacy_extensions;
242 }
243
244 static int link_enable_ipv6(Link *link) {
245 const char *p = NULL;
246 bool disabled;
247 int r;
248
249 if (link->flags & IFF_LOOPBACK)
250 return 0;
251
252 disabled = !link_ipv6_enabled(link);
253
254 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/disable_ipv6");
255
256 r = write_string_file(p, one_zero(disabled), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
257 if (r < 0)
258 log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m", disabled ? "disable" : "enable", link->ifname);
259 else
260 log_link_info(link, "IPv6 %sd for interface: %m", enable_disable(!disabled));
261
262 return 0;
263 }
264
265 void link_update_operstate(Link *link) {
266 LinkOperationalState operstate;
267 assert(link);
268
269 if (link->kernel_operstate == IF_OPER_DORMANT)
270 operstate = LINK_OPERSTATE_DORMANT;
271 else if (link_has_carrier(link)) {
272 Address *address;
273 uint8_t scope = RT_SCOPE_NOWHERE;
274 Iterator i;
275
276 /* if we have carrier, check what addresses we have */
277 SET_FOREACH(address, link->addresses, i) {
278 if (!address_is_ready(address))
279 continue;
280
281 if (address->scope < scope)
282 scope = address->scope;
283 }
284
285 /* for operstate we also take foreign addresses into account */
286 SET_FOREACH(address, link->addresses_foreign, i) {
287 if (!address_is_ready(address))
288 continue;
289
290 if (address->scope < scope)
291 scope = address->scope;
292 }
293
294 if (scope < RT_SCOPE_SITE)
295 /* universally accessible addresses found */
296 operstate = LINK_OPERSTATE_ROUTABLE;
297 else if (scope < RT_SCOPE_HOST)
298 /* only link or site local addresses found */
299 operstate = LINK_OPERSTATE_DEGRADED;
300 else
301 /* no useful addresses found */
302 operstate = LINK_OPERSTATE_CARRIER;
303 } else if (link->flags & IFF_UP)
304 operstate = LINK_OPERSTATE_NO_CARRIER;
305 else
306 operstate = LINK_OPERSTATE_OFF;
307
308 if (link->operstate != operstate) {
309 link->operstate = operstate;
310 link_send_changed(link, "OperationalState", NULL);
311 link_dirty(link);
312 }
313 }
314
315 #define FLAG_STRING(string, flag, old, new) \
316 (((old ^ new) & flag) \
317 ? ((old & flag) ? (" -" string) : (" +" string)) \
318 : "")
319
320 static int link_update_flags(Link *link, sd_netlink_message *m) {
321 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
322 uint8_t operstate;
323 int r;
324
325 assert(link);
326
327 r = sd_rtnl_message_link_get_flags(m, &flags);
328 if (r < 0)
329 return log_link_warning_errno(link, r, "Could not get link flags: %m");
330
331 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
332 if (r < 0)
333 /* if we got a message without operstate, take it to mean
334 the state was unchanged */
335 operstate = link->kernel_operstate;
336
337 if ((link->flags == flags) && (link->kernel_operstate == operstate))
338 return 0;
339
340 if (link->flags != flags) {
341 log_link_debug(link, "Flags change:%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
342 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
343 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
344 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
345 FLAG_STRING("UP", IFF_UP, link->flags, flags),
346 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
347 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
348 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
349 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
350 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
351 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
352 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
353 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
354 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
355 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
356 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
357 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
358 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
359 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
360 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
361
362 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
363 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
364 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
365 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
366 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
367 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
368 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
369 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
370
371 /* link flags are currently at most 18 bits, let's align to
372 * printing 20 */
373 if (unknown_flags_added)
374 log_link_debug(link,
375 "Unknown link flags gained: %#.5x (ignoring)",
376 unknown_flags_added);
377
378 if (unknown_flags_removed)
379 log_link_debug(link,
380 "Unknown link flags lost: %#.5x (ignoring)",
381 unknown_flags_removed);
382 }
383
384 link->flags = flags;
385 link->kernel_operstate = operstate;
386
387 link_update_operstate(link);
388
389 return 0;
390 }
391
392 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
393 _cleanup_link_unref_ Link *link = NULL;
394 uint16_t type;
395 const char *ifname, *kind = NULL;
396 int r, ifindex;
397 unsigned short iftype;
398
399 assert(manager);
400 assert(message);
401 assert(ret);
402
403 /* check for link kind */
404 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
405 if (r == 0) {
406 (void)sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
407 r = sd_netlink_message_exit_container(message);
408 if (r < 0)
409 return r;
410 }
411
412 r = sd_netlink_message_get_type(message, &type);
413 if (r < 0)
414 return r;
415 else if (type != RTM_NEWLINK)
416 return -EINVAL;
417
418 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
419 if (r < 0)
420 return r;
421 else if (ifindex <= 0)
422 return -EINVAL;
423
424 r = sd_rtnl_message_link_get_type(message, &iftype);
425 if (r < 0)
426 return r;
427
428 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
429 if (r < 0)
430 return r;
431
432 link = new0(Link, 1);
433 if (!link)
434 return -ENOMEM;
435
436 link->n_ref = 1;
437 link->manager = manager;
438 link->state = LINK_STATE_PENDING;
439 link->rtnl_extended_attrs = true;
440 link->ifindex = ifindex;
441 link->iftype = iftype;
442 link->ifname = strdup(ifname);
443 if (!link->ifname)
444 return -ENOMEM;
445
446 if (kind) {
447 link->kind = strdup(kind);
448 if (!link->kind)
449 return -ENOMEM;
450 }
451
452 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
453 if (r < 0)
454 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
455
456 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
457 return -ENOMEM;
458
459 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
460 return -ENOMEM;
461
462 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
463 return -ENOMEM;
464
465 r = hashmap_ensure_allocated(&manager->links, NULL);
466 if (r < 0)
467 return r;
468
469 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
470 if (r < 0)
471 return r;
472
473 r = link_update_flags(link, message);
474 if (r < 0)
475 return r;
476
477 *ret = link;
478 link = NULL;
479
480 return 0;
481 }
482
483 static void link_free(Link *link) {
484 Address *address;
485 Iterator i;
486 Link *carrier;
487
488 if (!link)
489 return;
490
491 while (!set_isempty(link->addresses))
492 address_free(set_first(link->addresses));
493
494 while (!set_isempty(link->addresses_foreign))
495 address_free(set_first(link->addresses_foreign));
496
497 link->addresses = set_free(link->addresses);
498
499 link->addresses_foreign = set_free(link->addresses_foreign);
500
501 while ((address = link->pool_addresses)) {
502 LIST_REMOVE(addresses, link->pool_addresses, address);
503 address_free(address);
504 }
505
506 sd_dhcp_server_unref(link->dhcp_server);
507 sd_dhcp_client_unref(link->dhcp_client);
508 sd_dhcp_lease_unref(link->dhcp_lease);
509
510 link_lldp_emit_stop(link);
511
512 free(link->lease_file);
513
514 sd_lldp_unref(link->lldp);
515 free(link->lldp_file);
516
517 sd_ipv4ll_unref(link->ipv4ll);
518 sd_dhcp6_client_unref(link->dhcp6_client);
519 sd_ndisc_unref(link->ndisc);
520
521 set_free_free(link->ndisc_rdnss);
522 set_free_free(link->ndisc_dnssl);
523
524 if (link->manager)
525 hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex));
526
527 free(link->ifname);
528
529 free(link->kind);
530
531 (void)unlink(link->state_file);
532 free(link->state_file);
533
534 udev_device_unref(link->udev_device);
535
536 HASHMAP_FOREACH (carrier, link->bound_to_links, i)
537 hashmap_remove(link->bound_to_links, INT_TO_PTR(carrier->ifindex));
538 hashmap_free(link->bound_to_links);
539
540 HASHMAP_FOREACH (carrier, link->bound_by_links, i)
541 hashmap_remove(link->bound_by_links, INT_TO_PTR(carrier->ifindex));
542 hashmap_free(link->bound_by_links);
543
544 free(link);
545 }
546
547 Link *link_unref(Link *link) {
548 if (!link)
549 return NULL;
550
551 assert(link->n_ref > 0);
552
553 link->n_ref--;
554
555 if (link->n_ref > 0)
556 return NULL;
557
558 link_free(link);
559
560 return NULL;
561 }
562
563 Link *link_ref(Link *link) {
564 if (!link)
565 return NULL;
566
567 assert(link->n_ref > 0);
568
569 link->n_ref++;
570
571 return link;
572 }
573
574 int link_get(Manager *m, int ifindex, Link **ret) {
575 Link *link;
576
577 assert(m);
578 assert(ifindex);
579 assert(ret);
580
581 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
582 if (!link)
583 return -ENODEV;
584
585 *ret = link;
586
587 return 0;
588 }
589
590 static void link_set_state(Link *link, LinkState state) {
591 assert(link);
592
593 if (link->state == state)
594 return;
595
596 link->state = state;
597
598 link_send_changed(link, "AdministrativeState", NULL);
599 }
600
601 static void link_enter_unmanaged(Link *link) {
602 assert(link);
603
604 log_link_debug(link, "Unmanaged");
605
606 link_set_state(link, LINK_STATE_UNMANAGED);
607
608 link_dirty(link);
609 }
610
611 static int link_stop_clients(Link *link) {
612 int r = 0, k;
613
614 assert(link);
615 assert(link->manager);
616 assert(link->manager->event);
617
618 if (link->dhcp_client) {
619 k = sd_dhcp_client_stop(link->dhcp_client);
620 if (k < 0)
621 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
622 }
623
624 if (link->ipv4ll) {
625 k = sd_ipv4ll_stop(link->ipv4ll);
626 if (k < 0)
627 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
628 }
629
630 if (link->dhcp6_client) {
631 k = sd_dhcp6_client_stop(link->dhcp6_client);
632 if (k < 0)
633 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
634 }
635
636 if (link->ndisc) {
637 k = sd_ndisc_stop(link->ndisc);
638 if (k < 0)
639 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
640 }
641
642 link_lldp_emit_stop(link);
643 return r;
644 }
645
646 void link_enter_failed(Link *link) {
647 assert(link);
648
649 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
650 return;
651
652 log_link_warning(link, "Failed");
653
654 link_set_state(link, LINK_STATE_FAILED);
655
656 link_stop_clients(link);
657
658 link_dirty(link);
659 }
660
661 static Address* link_find_dhcp_server_address(Link *link) {
662 Address *address;
663
664 assert(link);
665 assert(link->network);
666
667 /* The first statically configured address if there is any */
668 LIST_FOREACH(addresses, address, link->network->static_addresses) {
669
670 if (address->family != AF_INET)
671 continue;
672
673 if (in_addr_is_null(address->family, &address->in_addr))
674 continue;
675
676 return address;
677 }
678
679 /* If that didn't work, find a suitable address we got from the pool */
680 LIST_FOREACH(addresses, address, link->pool_addresses) {
681 if (address->family != AF_INET)
682 continue;
683
684 return address;
685 }
686
687 return NULL;
688 }
689
690 static int link_enter_configured(Link *link) {
691 assert(link);
692 assert(link->network);
693 assert(link->state == LINK_STATE_SETTING_ROUTES);
694
695 log_link_info(link, "Configured");
696
697 link_set_state(link, LINK_STATE_CONFIGURED);
698
699 link_dirty(link);
700
701 return 0;
702 }
703
704 void link_check_ready(Link *link) {
705 Address *a;
706 Iterator i;
707
708 assert(link);
709
710 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
711 return;
712
713 if (!link->network)
714 return;
715
716 if (!link->static_configured)
717 return;
718
719 if (link_ipv4ll_enabled(link))
720 if (!link->ipv4ll_address ||
721 !link->ipv4ll_route)
722 return;
723
724 if (link_ipv6ll_enabled(link))
725 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) > 0)
726 return;
727
728 if ((link_dhcp4_enabled(link) && !link_dhcp6_enabled(link) &&
729 !link->dhcp4_configured) ||
730 (link_dhcp6_enabled(link) && !link_dhcp4_enabled(link) &&
731 !link->dhcp6_configured) ||
732 (link_dhcp4_enabled(link) && link_dhcp6_enabled(link) &&
733 !link->dhcp4_configured && !link->dhcp6_configured))
734 return;
735
736 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
737 return;
738
739 SET_FOREACH(a, link->addresses, i)
740 if (!address_is_ready(a))
741 return;
742
743 if (link->state != LINK_STATE_CONFIGURED)
744 link_enter_configured(link);
745
746 return;
747 }
748
749 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
750 _cleanup_link_unref_ Link *link = userdata;
751 int r;
752
753 assert(link->link_messages > 0);
754 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
755 LINK_STATE_SETTING_ROUTES, LINK_STATE_FAILED,
756 LINK_STATE_LINGER));
757
758 link->link_messages--;
759
760 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
761 return 1;
762
763 r = sd_netlink_message_get_errno(m);
764 if (r < 0 && r != -EEXIST)
765 log_link_warning_errno(link, r, "Could not set route: %m");
766
767 if (link->link_messages == 0) {
768 log_link_debug(link, "Routes set");
769 link->static_configured = true;
770 link_check_ready(link);
771 }
772
773 return 1;
774 }
775
776 static int link_enter_set_routes(Link *link) {
777 Route *rt;
778 int r;
779
780 assert(link);
781 assert(link->network);
782 assert(link->state == LINK_STATE_SETTING_ADDRESSES);
783
784 link_set_state(link, LINK_STATE_SETTING_ROUTES);
785
786 LIST_FOREACH(routes, rt, link->network->static_routes) {
787 r = route_configure(rt, link, route_handler);
788 if (r < 0) {
789 log_link_warning_errno(link, r, "Could not set routes: %m");
790 link_enter_failed(link);
791 return r;
792 }
793
794 link->link_messages++;
795 }
796
797 if (link->link_messages == 0) {
798 link->static_configured = true;
799 link_check_ready(link);
800 } else
801 log_link_debug(link, "Setting routes");
802
803 return 0;
804 }
805
806 int link_route_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
807 _cleanup_link_unref_ Link *link = userdata;
808 int r;
809
810 assert(m);
811 assert(link);
812 assert(link->ifname);
813
814 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
815 return 1;
816
817 r = sd_netlink_message_get_errno(m);
818 if (r < 0 && r != -ESRCH)
819 log_link_warning_errno(link, r, "Could not drop route: %m");
820
821 return 1;
822 }
823
824 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
825 _cleanup_link_unref_ Link *link = userdata;
826 int r;
827
828 assert(rtnl);
829 assert(m);
830 assert(link);
831 assert(link->ifname);
832 assert(link->link_messages > 0);
833 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
834 LINK_STATE_FAILED, LINK_STATE_LINGER));
835
836 link->link_messages--;
837
838 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
839 return 1;
840
841 r = sd_netlink_message_get_errno(m);
842 if (r < 0 && r != -EEXIST)
843 log_link_warning_errno(link, r, "could not set address: %m");
844 else if (r >= 0)
845 manager_rtnl_process_address(rtnl, m, link->manager);
846
847 if (link->link_messages == 0) {
848 log_link_debug(link, "Addresses set");
849 link_enter_set_routes(link);
850 }
851
852 return 1;
853 }
854
855 static int link_push_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
856 _cleanup_free_ struct in_addr *addresses = NULL;
857 size_t n_addresses = 0, n_allocated = 0;
858 char **a;
859
860 log_debug("Copying DNS server information from %s", link->ifname);
861
862 if (!link->network)
863 return 0;
864
865 STRV_FOREACH(a, link->network->dns) {
866 struct in_addr ia;
867
868 /* Only look for IPv4 addresses */
869 if (inet_pton(AF_INET, *a, &ia) <= 0)
870 continue;
871
872 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
873 return log_oom();
874
875 addresses[n_addresses++] = ia;
876 }
877
878 if (link->network->dhcp_use_dns &&
879 link->dhcp_lease) {
880 const struct in_addr *da = NULL;
881 int n;
882
883 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
884 if (n > 0) {
885
886 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
887 return log_oom();
888
889 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
890 n_addresses += n;
891 }
892 }
893
894 if (n_addresses <= 0)
895 return 0;
896
897 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
898 }
899
900 static int link_push_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
901 _cleanup_free_ struct in_addr *addresses = NULL;
902 size_t n_addresses = 0, n_allocated = 0;
903 char **a;
904
905 if (!link->network)
906 return 0;
907
908 log_debug("Copying NTP server information from %s", link->ifname);
909
910 STRV_FOREACH(a, link->network->ntp) {
911 struct in_addr ia;
912
913 /* Only look for IPv4 addresses */
914 if (inet_pton(AF_INET, *a, &ia) <= 0)
915 continue;
916
917 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
918 return log_oom();
919
920 addresses[n_addresses++] = ia;
921 }
922
923 if (link->network->dhcp_use_ntp &&
924 link->dhcp_lease) {
925 const struct in_addr *da = NULL;
926 int n;
927
928 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
929 if (n > 0) {
930
931 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
932 return log_oom();
933
934 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
935 n_addresses += n;
936 }
937 }
938
939 if (n_addresses <= 0)
940 return 0;
941
942 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
943 }
944
945 static int link_set_bridge_fdb(Link *link) {
946 FdbEntry *fdb_entry;
947 int r = 0;
948
949 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
950 r = fdb_entry_configure(link, fdb_entry);
951 if (r < 0) {
952 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
953 }
954 }
955
956 return r;
957 }
958
959 static int link_enter_set_addresses(Link *link) {
960 Address *ad;
961 int r;
962
963 assert(link);
964 assert(link->network);
965 assert(link->state != _LINK_STATE_INVALID);
966
967 r = link_set_bridge_fdb(link);
968 if (r < 0)
969 return r;
970
971 link_set_state(link, LINK_STATE_SETTING_ADDRESSES);
972
973 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
974 r = address_configure(ad, link, address_handler, false);
975 if (r < 0) {
976 log_link_warning_errno(link, r, "Could not set addresses: %m");
977 link_enter_failed(link);
978 return r;
979 }
980
981 link->link_messages++;
982 }
983
984 /* now that we can figure out a default address for the dhcp server,
985 start it */
986 if (link_dhcp4_server_enabled(link)) {
987 Address *address;
988 Link *uplink = NULL;
989 bool acquired_uplink = false;
990
991 address = link_find_dhcp_server_address(link);
992 if (!address) {
993 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
994 link_enter_failed(link);
995 return 0;
996 }
997
998 /* use the server address' subnet as the pool */
999 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1000 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1001 if (r < 0)
1002 return r;
1003
1004 /* TODO:
1005 r = sd_dhcp_server_set_router(link->dhcp_server,
1006 &main_address->in_addr.in);
1007 if (r < 0)
1008 return r;
1009 */
1010
1011 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1012 r = sd_dhcp_server_set_max_lease_time(
1013 link->dhcp_server,
1014 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1015 if (r < 0)
1016 return r;
1017 }
1018
1019 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1020 r = sd_dhcp_server_set_default_lease_time(
1021 link->dhcp_server,
1022 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1023 if (r < 0)
1024 return r;
1025 }
1026
1027 if (link->network->dhcp_server_emit_dns) {
1028
1029 if (link->network->n_dhcp_server_dns > 0)
1030 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1031 else {
1032 uplink = manager_find_uplink(link->manager, link);
1033 acquired_uplink = true;
1034
1035 if (!uplink) {
1036 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1037 r = 0;
1038 } else
1039 r = link_push_dns_to_dhcp_server(uplink, link->dhcp_server);
1040 }
1041 if (r < 0)
1042 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1043 }
1044
1045
1046 if (link->network->dhcp_server_emit_ntp) {
1047
1048 if (link->network->n_dhcp_server_ntp > 0)
1049 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1050 else {
1051 if (!acquired_uplink)
1052 uplink = manager_find_uplink(link->manager, link);
1053
1054 if (!uplink) {
1055 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1056 r = 0;
1057 } else
1058 r = link_push_ntp_to_dhcp_server(uplink, link->dhcp_server);
1059
1060 }
1061 if (r < 0)
1062 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1063 }
1064
1065 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1066 if (r < 0) {
1067 log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1068 return r;
1069 }
1070
1071 if (link->network->dhcp_server_emit_timezone) {
1072 _cleanup_free_ char *buffer = NULL;
1073 const char *tz = NULL;
1074
1075 if (link->network->dhcp_server_timezone)
1076 tz = link->network->dhcp_server_timezone;
1077 else {
1078 r = get_timezone(&buffer);
1079 if (r < 0)
1080 log_warning_errno(r, "Failed to determine timezone: %m");
1081 else
1082 tz = buffer;
1083 }
1084
1085 if (tz) {
1086 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1087 if (r < 0)
1088 return r;
1089 }
1090 }
1091
1092 r = sd_dhcp_server_start(link->dhcp_server);
1093 if (r < 0) {
1094 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1095
1096 link_enter_failed(link);
1097
1098 return 0;
1099 }
1100
1101 log_link_debug(link, "Offering DHCPv4 leases");
1102 }
1103
1104 if (link->link_messages == 0)
1105 link_enter_set_routes(link);
1106 else
1107 log_link_debug(link, "Setting addresses");
1108
1109 return 0;
1110 }
1111
1112 int link_address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1113 _cleanup_link_unref_ Link *link = userdata;
1114 int r;
1115
1116 assert(m);
1117 assert(link);
1118 assert(link->ifname);
1119
1120 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1121 return 1;
1122
1123 r = sd_netlink_message_get_errno(m);
1124 if (r < 0 && r != -EADDRNOTAVAIL)
1125 log_link_warning_errno(link, r, "Could not drop address: %m");
1126
1127 return 1;
1128 }
1129
1130 static int link_set_bridge_vlan(Link *link) {
1131 int r = 0;
1132
1133 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1134 if (r < 0)
1135 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1136
1137 return r;
1138 }
1139
1140 static int link_set_proxy_arp(Link *link) {
1141 const char *p = NULL;
1142 int r;
1143
1144 if (!link_proxy_arp_enabled(link))
1145 return 0;
1146
1147 p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/proxy_arp");
1148
1149 r = write_string_file(p, one_zero(link->network->proxy_arp), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
1150 if (r < 0)
1151 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1152
1153 return 0;
1154 }
1155
1156 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1157 _cleanup_link_unref_ Link *link = userdata;
1158 int r;
1159
1160 log_link_debug(link, "Set link");
1161
1162 r = sd_netlink_message_get_errno(m);
1163 if (r < 0 && r != -EEXIST) {
1164 log_link_error_errno(link, r, "Could not join netdev: %m");
1165 link_enter_failed(link);
1166 return 1;
1167 }
1168
1169 return 0;
1170 }
1171
1172 static int set_hostname_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
1173 _cleanup_link_unref_ Link *link = userdata;
1174 const sd_bus_error *e;
1175
1176 assert(m);
1177 assert(link);
1178
1179 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1180 return 1;
1181
1182 e = sd_bus_message_get_error(m);
1183 if (e)
1184 log_link_warning_errno(link, sd_bus_error_get_errno(e), "Could not set hostname: %s", e->message);
1185
1186 return 1;
1187 }
1188
1189 int link_set_hostname(Link *link, const char *hostname) {
1190 int r;
1191
1192 assert(link);
1193 assert(link->manager);
1194
1195 log_link_debug(link, "Setting transient hostname: '%s'", strna(hostname));
1196
1197 if (!link->manager->bus) {
1198 /* TODO: replace by assert when we can rely on kdbus */
1199 log_link_info(link, "Not connected to system bus, ignoring transient hostname.");
1200 return 0;
1201 }
1202
1203 r = sd_bus_call_method_async(
1204 link->manager->bus,
1205 NULL,
1206 "org.freedesktop.hostname1",
1207 "/org/freedesktop/hostname1",
1208 "org.freedesktop.hostname1",
1209 "SetHostname",
1210 set_hostname_handler,
1211 link,
1212 "sb",
1213 hostname,
1214 false);
1215
1216 if (r < 0)
1217 return log_link_error_errno(link, r, "Could not set transient hostname: %m");
1218
1219 link_ref(link);
1220
1221 return 0;
1222 }
1223
1224 static int set_timezone_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
1225 _cleanup_link_unref_ Link *link = userdata;
1226 const sd_bus_error *e;
1227
1228 assert(m);
1229 assert(link);
1230
1231 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1232 return 1;
1233
1234 e = sd_bus_message_get_error(m);
1235 if (e)
1236 log_link_warning_errno(link, sd_bus_error_get_errno(e), "Could not set timezone: %s", e->message);
1237
1238 return 1;
1239 }
1240
1241 int link_set_timezone(Link *link, const char *tz) {
1242 int r;
1243
1244 assert(link);
1245 assert(link->manager);
1246 assert(tz);
1247
1248 log_link_debug(link, "Setting system timezone: '%s'", tz);
1249
1250 if (!link->manager->bus) {
1251 log_link_info(link, "Not connected to system bus, ignoring timezone.");
1252 return 0;
1253 }
1254
1255 r = sd_bus_call_method_async(
1256 link->manager->bus,
1257 NULL,
1258 "org.freedesktop.timedate1",
1259 "/org/freedesktop/timedate1",
1260 "org.freedesktop.timedate1",
1261 "SetTimezone",
1262 set_timezone_handler,
1263 link,
1264 "sb",
1265 tz,
1266 false);
1267 if (r < 0)
1268 return log_link_error_errno(link, r, "Could not set timezone: %m");
1269
1270 link_ref(link);
1271
1272 return 0;
1273 }
1274
1275 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1276 _cleanup_link_unref_ Link *link = userdata;
1277 int r;
1278
1279 assert(m);
1280 assert(link);
1281 assert(link->ifname);
1282
1283 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1284 return 1;
1285
1286 r = sd_netlink_message_get_errno(m);
1287 if (r < 0)
1288 log_link_warning_errno(link, r, "Could not set MTU: %m");
1289
1290 return 1;
1291 }
1292
1293 int link_set_mtu(Link *link, uint32_t mtu) {
1294 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1295 int r;
1296
1297 assert(link);
1298 assert(link->manager);
1299 assert(link->manager->rtnl);
1300
1301 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1302
1303 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1304 if (r < 0)
1305 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1306
1307 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1308 if (r < 0)
1309 return log_link_error_errno(link, r, "Could not append MTU: %m");
1310
1311 r = sd_netlink_call_async(link->manager->rtnl, req, set_mtu_handler, link, 0, NULL);
1312 if (r < 0)
1313 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1314
1315 link_ref(link);
1316
1317 return 0;
1318 }
1319
1320 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1321 _cleanup_link_unref_ Link *link = userdata;
1322 int r;
1323
1324 assert(m);
1325 assert(link);
1326 assert(link->ifname);
1327
1328 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1329 return 1;
1330
1331 r = sd_netlink_message_get_errno(m);
1332 if (r < 0)
1333 log_link_warning_errno(link, r, "Could not set link flags: %m");
1334
1335 return 1;
1336 }
1337
1338 static int link_set_flags(Link *link) {
1339 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1340 unsigned ifi_change = 0;
1341 unsigned ifi_flags = 0;
1342 int r;
1343
1344 assert(link);
1345 assert(link->manager);
1346 assert(link->manager->rtnl);
1347
1348 if (link->flags & IFF_LOOPBACK)
1349 return 0;
1350
1351 if (!link->network)
1352 return 0;
1353
1354 if (link->network->arp < 0)
1355 return 0;
1356
1357 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1358 if (r < 0)
1359 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1360
1361 if (link->network->arp >= 0) {
1362 ifi_change |= IFF_NOARP;
1363 ifi_flags |= link->network->arp ? 0 : IFF_NOARP;
1364 }
1365
1366 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1367 if (r < 0)
1368 return log_link_error_errno(link, r, "Could not set link flags: %m");
1369
1370 r = sd_netlink_call_async(link->manager->rtnl, req, set_flags_handler, link, 0, NULL);
1371 if (r < 0)
1372 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1373
1374 link_ref(link);
1375
1376 return 0;
1377 }
1378
1379 static int link_set_bridge(Link *link) {
1380 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1381 int r;
1382
1383 assert(link);
1384 assert(link->network);
1385
1386 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1387 if (r < 0)
1388 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1389
1390 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1391 if (r < 0)
1392 return log_link_error_errno(link, r, "Could not set message family: %m");
1393
1394 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1395 if (r < 0)
1396 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1397
1398 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, !link->network->use_bpdu);
1399 if (r < 0)
1400 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1401
1402 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1403 if (r < 0)
1404 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1405
1406 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1407 if (r < 0)
1408 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1409
1410 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, !link->network->allow_port_to_be_root);
1411 if (r < 0)
1412 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1413
1414 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1415 if (r < 0)
1416 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1417
1418 if (link->network->cost != 0) {
1419 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1420 if (r < 0)
1421 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1422 }
1423
1424 r = sd_netlink_message_close_container(req);
1425 if (r < 0)
1426 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1427
1428 r = sd_netlink_call_async(link->manager->rtnl, req, link_set_handler, link, 0, NULL);
1429 if (r < 0)
1430 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1431
1432 link_ref(link);
1433
1434 return r;
1435 }
1436
1437 static int link_lldp_save(Link *link) {
1438 _cleanup_free_ char *temp_path = NULL;
1439 _cleanup_fclose_ FILE *f = NULL;
1440 sd_lldp_neighbor **l = NULL;
1441 int n = 0, r, i;
1442
1443 assert(link);
1444 assert(link->lldp_file);
1445
1446 if (!link->lldp) {
1447 (void) unlink(link->lldp_file);
1448 return 0;
1449 }
1450
1451 r = sd_lldp_get_neighbors(link->lldp, &l);
1452 if (r < 0)
1453 goto finish;
1454 if (r == 0) {
1455 (void) unlink(link->lldp_file);
1456 goto finish;
1457 }
1458
1459 n = r;
1460
1461 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1462 if (r < 0)
1463 goto finish;
1464
1465 fchmod(fileno(f), 0644);
1466
1467 for (i = 0; i < n; i++) {
1468 const void *p;
1469 le64_t u;
1470 size_t sz;
1471
1472 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1473 if (r < 0)
1474 goto finish;
1475
1476 u = htole64(sz);
1477 (void) fwrite(&u, 1, sizeof(u), f);
1478 (void) fwrite(p, 1, sz, f);
1479 }
1480
1481 r = fflush_and_check(f);
1482 if (r < 0)
1483 goto finish;
1484
1485 if (rename(temp_path, link->lldp_file) < 0) {
1486 r = -errno;
1487 goto finish;
1488 }
1489
1490 finish:
1491 if (r < 0) {
1492 (void) unlink(link->lldp_file);
1493 if (temp_path)
1494 (void) unlink(temp_path);
1495
1496 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1497 }
1498
1499 if (l) {
1500 for (i = 0; i < n; i++)
1501 sd_lldp_neighbor_unref(l[i]);
1502 free(l);
1503 }
1504
1505 return r;
1506 }
1507
1508 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1509 Link *link = userdata;
1510 int r;
1511
1512 assert(link);
1513
1514 (void) link_lldp_save(link);
1515
1516 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1517 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1518
1519 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1520
1521 r = link_lldp_emit_start(link);
1522 if (r < 0)
1523 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1524 }
1525 }
1526
1527 static int link_acquire_ipv6_conf(Link *link) {
1528 int r;
1529
1530 assert(link);
1531
1532 if (link_dhcp6_enabled(link)) {
1533 assert(link->dhcp6_client);
1534 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1535
1536 /* start DHCPv6 client in stateless mode */
1537 r = dhcp6_request_address(link, true);
1538 if (r < 0 && r != -EBUSY)
1539 return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m");
1540 else
1541 log_link_debug(link, "Acquiring DHCPv6 lease");
1542 }
1543
1544 if (link_ipv6_accept_ra_enabled(link)) {
1545 assert(link->ndisc);
1546
1547 log_link_debug(link, "Discovering IPv6 routers");
1548
1549 r = sd_ndisc_start(link->ndisc);
1550 if (r < 0 && r != -EBUSY)
1551 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1552 }
1553
1554 return 0;
1555 }
1556
1557 static int link_acquire_ipv4_conf(Link *link) {
1558 int r;
1559
1560 assert(link);
1561 assert(link->network);
1562 assert(link->manager);
1563 assert(link->manager->event);
1564
1565 if (link_ipv4ll_enabled(link)) {
1566 assert(link->ipv4ll);
1567
1568 log_link_debug(link, "Acquiring IPv4 link-local address");
1569
1570 r = sd_ipv4ll_start(link->ipv4ll);
1571 if (r < 0)
1572 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1573 }
1574
1575 if (link_dhcp4_enabled(link)) {
1576 assert(link->dhcp_client);
1577
1578 log_link_debug(link, "Acquiring DHCPv4 lease");
1579
1580 r = sd_dhcp_client_start(link->dhcp_client);
1581 if (r < 0)
1582 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1583 }
1584
1585 return 0;
1586 }
1587
1588 static int link_acquire_conf(Link *link) {
1589 int r;
1590
1591 assert(link);
1592
1593 r = link_acquire_ipv4_conf(link);
1594 if (r < 0)
1595 return r;
1596
1597 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) == 0) {
1598 r = link_acquire_ipv6_conf(link);
1599 if (r < 0)
1600 return r;
1601 }
1602
1603 if (link_lldp_emit_enabled(link)) {
1604 r = link_lldp_emit_start(link);
1605 if (r < 0)
1606 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1607 }
1608
1609 return 0;
1610 }
1611
1612 bool link_has_carrier(Link *link) {
1613 /* see Documentation/networking/operstates.txt in the kernel sources */
1614
1615 if (link->kernel_operstate == IF_OPER_UP)
1616 return true;
1617
1618 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1619 /* operstate may not be implemented, so fall back to flags */
1620 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1621 return true;
1622
1623 return false;
1624 }
1625
1626 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1627 _cleanup_link_unref_ Link *link = userdata;
1628 int r;
1629
1630 assert(link);
1631
1632 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1633 return 1;
1634
1635 r = sd_netlink_message_get_errno(m);
1636 if (r < 0)
1637 /* we warn but don't fail the link, as it may be
1638 brought up later */
1639 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1640
1641 return 1;
1642 }
1643
1644 static int link_up(Link *link) {
1645 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1646 uint8_t ipv6ll_mode;
1647 int r;
1648
1649 assert(link);
1650 assert(link->network);
1651 assert(link->manager);
1652 assert(link->manager->rtnl);
1653
1654 log_link_debug(link, "Bringing link up");
1655
1656 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1657 if (r < 0)
1658 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1659
1660 /* set it free if not enslaved with networkd */
1661 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1662 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1663 if (r < 0)
1664 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1665 }
1666
1667 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1668 if (r < 0)
1669 return log_link_error_errno(link, r, "Could not set link flags: %m");
1670
1671 if (link->network->mac) {
1672 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1673 if (r < 0)
1674 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1675 }
1676
1677 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1678 for this interface, or if it is a bridge slave, then disable IPv6 else enable it. */
1679 (void) link_enable_ipv6(link);
1680
1681 if (link->network->mtu) {
1682 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1683 on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1684 if (link_ipv6_enabled(link) && link->network->mtu < IPV6_MIN_MTU) {
1685
1686 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1687 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1688
1689 link->network->mtu = IPV6_MIN_MTU;
1690 }
1691
1692 r = sd_netlink_message_append_u32(req, IFLA_MTU, link->network->mtu);
1693 if (r < 0)
1694 return log_link_error_errno(link, r, "Could not set MTU: %m");
1695 }
1696
1697 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1698 if (r < 0)
1699 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1700
1701 if (link_ipv6_enabled(link)) {
1702 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
1703 r = sd_netlink_message_open_container(req, AF_INET6);
1704 if (r < 0)
1705 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1706
1707 if (!link_ipv6ll_enabled(link))
1708 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1709 else {
1710 const char *p = NULL;
1711 _cleanup_free_ char *stable_secret = NULL;
1712
1713 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/stable_secret");
1714 r = read_one_line_file(p, &stable_secret);
1715
1716 if (r < 0)
1717 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1718 else
1719 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1720 }
1721 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1722 if (r < 0)
1723 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1724
1725 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
1726 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
1727 if (r < 0)
1728 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
1729 }
1730
1731 r = sd_netlink_message_close_container(req);
1732 if (r < 0)
1733 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1734 }
1735
1736 r = sd_netlink_message_close_container(req);
1737 if (r < 0)
1738 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1739
1740 r = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
1741 if (r < 0)
1742 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1743
1744 link_ref(link);
1745
1746 return 0;
1747 }
1748
1749 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1750 _cleanup_link_unref_ Link *link = userdata;
1751 int r;
1752
1753 assert(link);
1754
1755 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1756 return 1;
1757
1758 r = sd_netlink_message_get_errno(m);
1759 if (r < 0)
1760 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1761
1762 return 1;
1763 }
1764
1765 static int link_down(Link *link) {
1766 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1767 int r;
1768
1769 assert(link);
1770 assert(link->manager);
1771 assert(link->manager->rtnl);
1772
1773 log_link_debug(link, "Bringing link down");
1774
1775 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1776 RTM_SETLINK, link->ifindex);
1777 if (r < 0)
1778 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1779
1780 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1781 if (r < 0)
1782 return log_link_error_errno(link, r, "Could not set link flags: %m");
1783
1784 r = sd_netlink_call_async(link->manager->rtnl, req, link_down_handler, link, 0, NULL);
1785 if (r < 0)
1786 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1787
1788 link_ref(link);
1789
1790 return 0;
1791 }
1792
1793 static int link_up_can(Link *link) {
1794 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1795 int r;
1796
1797 assert(link);
1798
1799 log_link_debug(link, "Bringing CAN link up");
1800
1801 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1802 if (r < 0)
1803 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1804
1805 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1806 if (r < 0)
1807 return log_link_error_errno(link, r, "Could not set link flags: %m");
1808
1809 r = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
1810 if (r < 0)
1811 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1812
1813 link_ref(link);
1814
1815 return 0;
1816 }
1817
1818 static int link_handle_bound_to_list(Link *link) {
1819 Link *l;
1820 Iterator i;
1821 int r;
1822 bool required_up = false;
1823 bool link_is_up = false;
1824
1825 assert(link);
1826
1827 if (hashmap_isempty(link->bound_to_links))
1828 return 0;
1829
1830 if (link->flags & IFF_UP)
1831 link_is_up = true;
1832
1833 HASHMAP_FOREACH (l, link->bound_to_links, i)
1834 if (link_has_carrier(l)) {
1835 required_up = true;
1836 break;
1837 }
1838
1839 if (!required_up && link_is_up) {
1840 r = link_down(link);
1841 if (r < 0)
1842 return r;
1843 } else if (required_up && !link_is_up) {
1844 r = link_up(link);
1845 if (r < 0)
1846 return r;
1847 }
1848
1849 return 0;
1850 }
1851
1852 static int link_handle_bound_by_list(Link *link) {
1853 Iterator i;
1854 Link *l;
1855 int r;
1856
1857 assert(link);
1858
1859 if (hashmap_isempty(link->bound_by_links))
1860 return 0;
1861
1862 HASHMAP_FOREACH (l, link->bound_by_links, i) {
1863 r = link_handle_bound_to_list(l);
1864 if (r < 0)
1865 return r;
1866 }
1867
1868 return 0;
1869 }
1870
1871 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1872 int r;
1873
1874 assert(link);
1875 assert(carrier);
1876
1877 if (link == carrier)
1878 return 0;
1879
1880 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1881 return 0;
1882
1883 r = hashmap_ensure_allocated(h, NULL);
1884 if (r < 0)
1885 return r;
1886
1887 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1888 if (r < 0)
1889 return r;
1890
1891 return 0;
1892 }
1893
1894 static int link_new_bound_by_list(Link *link) {
1895 Manager *m;
1896 Link *carrier;
1897 Iterator i;
1898 int r;
1899 bool list_updated = false;
1900
1901 assert(link);
1902 assert(link->manager);
1903
1904 m = link->manager;
1905
1906 HASHMAP_FOREACH(carrier, m->links, i) {
1907 if (!carrier->network)
1908 continue;
1909
1910 if (strv_isempty(carrier->network->bind_carrier))
1911 continue;
1912
1913 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
1914 r = link_put_carrier(link, carrier, &link->bound_by_links);
1915 if (r < 0)
1916 return r;
1917
1918 list_updated = true;
1919 }
1920 }
1921
1922 if (list_updated)
1923 link_dirty(link);
1924
1925 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
1926 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1927 if (r < 0)
1928 return r;
1929
1930 link_dirty(carrier);
1931 }
1932
1933 return 0;
1934 }
1935
1936 static int link_new_bound_to_list(Link *link) {
1937 Manager *m;
1938 Link *carrier;
1939 Iterator i;
1940 int r;
1941 bool list_updated = false;
1942
1943 assert(link);
1944 assert(link->manager);
1945
1946 if (!link->network)
1947 return 0;
1948
1949 if (strv_isempty(link->network->bind_carrier))
1950 return 0;
1951
1952 m = link->manager;
1953
1954 HASHMAP_FOREACH (carrier, m->links, i) {
1955 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
1956 r = link_put_carrier(link, carrier, &link->bound_to_links);
1957 if (r < 0)
1958 return r;
1959
1960 list_updated = true;
1961 }
1962 }
1963
1964 if (list_updated)
1965 link_dirty(link);
1966
1967 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
1968 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
1969 if (r < 0)
1970 return r;
1971
1972 link_dirty(carrier);
1973 }
1974
1975 return 0;
1976 }
1977
1978 static int link_new_carrier_maps(Link *link) {
1979 int r;
1980
1981 r = link_new_bound_by_list(link);
1982 if (r < 0)
1983 return r;
1984
1985 r = link_handle_bound_by_list(link);
1986 if (r < 0)
1987 return r;
1988
1989 r = link_new_bound_to_list(link);
1990 if (r < 0)
1991 return r;
1992
1993 r = link_handle_bound_to_list(link);
1994 if (r < 0)
1995 return r;
1996
1997 return 0;
1998 }
1999
2000 static void link_free_bound_to_list(Link *link) {
2001 Link *bound_to;
2002 Iterator i;
2003
2004 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2005 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2006
2007 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2008 link_dirty(bound_to);
2009 }
2010
2011 return;
2012 }
2013
2014 static void link_free_bound_by_list(Link *link) {
2015 Link *bound_by;
2016 Iterator i;
2017
2018 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2019 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2020
2021 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2022 link_dirty(bound_by);
2023 link_handle_bound_to_list(bound_by);
2024 }
2025 }
2026
2027 return;
2028 }
2029
2030 static void link_free_carrier_maps(Link *link) {
2031 bool list_updated = false;
2032
2033 assert(link);
2034
2035 if (!hashmap_isempty(link->bound_to_links)) {
2036 link_free_bound_to_list(link);
2037 list_updated = true;
2038 }
2039
2040 if (!hashmap_isempty(link->bound_by_links)) {
2041 link_free_bound_by_list(link);
2042 list_updated = true;
2043 }
2044
2045 if (list_updated)
2046 link_dirty(link);
2047
2048 return;
2049 }
2050
2051 void link_drop(Link *link) {
2052 if (!link || link->state == LINK_STATE_LINGER)
2053 return;
2054
2055 link_set_state(link, LINK_STATE_LINGER);
2056
2057 link_free_carrier_maps(link);
2058
2059 log_link_debug(link, "Link removed");
2060
2061 (void)unlink(link->state_file);
2062 link_unref(link);
2063
2064 return;
2065 }
2066
2067 static int link_joined(Link *link) {
2068 int r;
2069
2070 assert(link);
2071 assert(link->network);
2072
2073 if (!hashmap_isempty(link->bound_to_links)) {
2074 r = link_handle_bound_to_list(link);
2075 if (r < 0)
2076 return r;
2077 } else if (!(link->flags & IFF_UP)) {
2078 r = link_up(link);
2079 if (r < 0) {
2080 link_enter_failed(link);
2081 return r;
2082 }
2083 }
2084
2085 if (link->network->bridge) {
2086 r = link_set_bridge(link);
2087 if (r < 0)
2088 log_link_error_errno(link, r, "Could not set bridge message: %m");
2089 }
2090
2091 if (link->network->use_br_vlan &&
2092 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2093 r = link_set_bridge_vlan(link);
2094 if (r < 0)
2095 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2096 }
2097
2098 return link_enter_set_addresses(link);
2099 }
2100
2101 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
2102 _cleanup_link_unref_ Link *link = userdata;
2103 int r;
2104
2105 assert(link);
2106 assert(link->network);
2107
2108 link->enslaving--;
2109
2110 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2111 return 1;
2112
2113 r = sd_netlink_message_get_errno(m);
2114 if (r < 0 && r != -EEXIST) {
2115 log_link_error_errno(link, r, "Could not join netdev: %m");
2116 link_enter_failed(link);
2117 return 1;
2118 } else
2119 log_link_debug(link, "Joined netdev");
2120
2121 if (link->enslaving <= 0)
2122 link_joined(link);
2123
2124 return 1;
2125 }
2126
2127 static int link_enter_join_netdev(Link *link) {
2128 NetDev *netdev;
2129 Iterator i;
2130 int r;
2131
2132 assert(link);
2133 assert(link->network);
2134 assert(link->state == LINK_STATE_PENDING);
2135
2136 link_set_state(link, LINK_STATE_ENSLAVING);
2137
2138 link_dirty(link);
2139
2140 if (!link->network->bridge &&
2141 !link->network->bond &&
2142 !link->network->vrf &&
2143 hashmap_isempty(link->network->stacked_netdevs))
2144 return link_joined(link);
2145
2146 if (link->network->bond) {
2147 log_struct(LOG_DEBUG,
2148 LOG_LINK_INTERFACE(link),
2149 LOG_NETDEV_INTERFACE(link->network->bond),
2150 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname),
2151 NULL);
2152
2153 r = netdev_join(link->network->bond, link, netdev_join_handler);
2154 if (r < 0) {
2155 log_struct_errno(LOG_WARNING, r,
2156 LOG_LINK_INTERFACE(link),
2157 LOG_NETDEV_INTERFACE(link->network->bond),
2158 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname),
2159 NULL);
2160
2161 link_enter_failed(link);
2162 return r;
2163 }
2164
2165 link->enslaving++;
2166 }
2167
2168 if (link->network->bridge) {
2169 log_struct(LOG_DEBUG,
2170 LOG_LINK_INTERFACE(link),
2171 LOG_NETDEV_INTERFACE(link->network->bridge),
2172 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname),
2173 NULL);
2174
2175 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2176 if (r < 0) {
2177 log_struct_errno(LOG_WARNING, r,
2178 LOG_LINK_INTERFACE(link),
2179 LOG_NETDEV_INTERFACE(link->network->bridge),
2180 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname),
2181 NULL),
2182 link_enter_failed(link);
2183 return r;
2184 }
2185
2186 link->enslaving++;
2187 }
2188
2189 if (link->network->vrf) {
2190 log_struct(LOG_DEBUG,
2191 LOG_LINK_INTERFACE(link),
2192 LOG_NETDEV_INTERFACE(link->network->vrf),
2193 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname),
2194 NULL);
2195 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2196 if (r < 0) {
2197 log_struct_errno(LOG_WARNING, r,
2198 LOG_LINK_INTERFACE(link),
2199 LOG_NETDEV_INTERFACE(link->network->vrf),
2200 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname),
2201 NULL);
2202 link_enter_failed(link);
2203 return r;
2204 }
2205
2206 link->enslaving++;
2207 }
2208
2209 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2210
2211 log_struct(LOG_DEBUG,
2212 LOG_LINK_INTERFACE(link),
2213 LOG_NETDEV_INTERFACE(netdev),
2214 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname),
2215 NULL);
2216
2217 r = netdev_join(netdev, link, netdev_join_handler);
2218 if (r < 0) {
2219 log_struct_errno(LOG_WARNING, r,
2220 LOG_LINK_INTERFACE(link),
2221 LOG_NETDEV_INTERFACE(netdev),
2222 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname),
2223 NULL);
2224 link_enter_failed(link);
2225 return r;
2226 }
2227
2228 link->enslaving++;
2229 }
2230
2231 return 0;
2232 }
2233
2234 static int link_set_ipv4_forward(Link *link) {
2235 int r;
2236
2237 if (!link_ipv4_forward_enabled(link))
2238 return 0;
2239
2240 /* We propagate the forwarding flag from one interface to the
2241 * global setting one way. This means: as long as at least one
2242 * interface was configured at any time that had IP forwarding
2243 * enabled the setting will stay on for good. We do this
2244 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2245 * somewhat in sync (see below). */
2246
2247 r = write_string_file("/proc/sys/net/ipv4/ip_forward", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2248 if (r < 0)
2249 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2250
2251 return 0;
2252 }
2253
2254 static int link_set_ipv6_forward(Link *link) {
2255 int r;
2256
2257 if (!link_ipv6_forward_enabled(link))
2258 return 0;
2259
2260 /* On Linux, the IPv6 stack does not know a per-interface
2261 * packet forwarding setting: either packet forwarding is on
2262 * for all, or off for all. We hence don't bother with a
2263 * per-interface setting, but simply propagate the interface
2264 * flag, if it is set, to the global flag, one-way. Note that
2265 * while IPv4 would allow a per-interface flag, we expose the
2266 * same behaviour there and also propagate the setting from
2267 * one to all, to keep things simple (see above). */
2268
2269 r = write_string_file("/proc/sys/net/ipv6/conf/all/forwarding", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2270 if (r < 0)
2271 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2272
2273 return 0;
2274 }
2275
2276 static int link_set_ipv6_privacy_extensions(Link *link) {
2277 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2278 IPv6PrivacyExtensions s;
2279 const char *p = NULL;
2280 int r;
2281
2282 s = link_ipv6_privacy_extensions(link);
2283 if (s < 0)
2284 return 0;
2285
2286 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/use_tempaddr");
2287 xsprintf(buf, "%u", (unsigned) link->network->ipv6_privacy_extensions);
2288
2289 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2290 if (r < 0)
2291 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2292
2293 return 0;
2294 }
2295
2296 static int link_set_ipv6_accept_ra(Link *link) {
2297 const char *p = NULL;
2298 int r;
2299
2300 /* Make this a NOP if IPv6 is not available */
2301 if (!socket_ipv6_is_supported())
2302 return 0;
2303
2304 if (link->flags & IFF_LOOPBACK)
2305 return 0;
2306
2307 if (!link->network)
2308 return 0;
2309
2310 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/accept_ra");
2311
2312 /* We handle router advertisements ourselves, tell the kernel to GTFO */
2313 r = write_string_file(p, "0", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2314 if (r < 0)
2315 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2316
2317 return 0;
2318 }
2319
2320 static int link_set_ipv6_dad_transmits(Link *link) {
2321 char buf[DECIMAL_STR_MAX(int) + 1];
2322 const char *p = NULL;
2323 int r;
2324
2325 /* Make this a NOP if IPv6 is not available */
2326 if (!socket_ipv6_is_supported())
2327 return 0;
2328
2329 if (link->flags & IFF_LOOPBACK)
2330 return 0;
2331
2332 if (!link->network)
2333 return 0;
2334
2335 if (link->network->ipv6_dad_transmits < 0)
2336 return 0;
2337
2338 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/dad_transmits");
2339 xsprintf(buf, "%i", link->network->ipv6_dad_transmits);
2340
2341 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2342 if (r < 0)
2343 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2344
2345 return 0;
2346 }
2347
2348 static int link_set_ipv6_hop_limit(Link *link) {
2349 char buf[DECIMAL_STR_MAX(int) + 1];
2350 const char *p = NULL;
2351 int r;
2352
2353 /* Make this a NOP if IPv6 is not available */
2354 if (!socket_ipv6_is_supported())
2355 return 0;
2356
2357 if (link->flags & IFF_LOOPBACK)
2358 return 0;
2359
2360 if (!link->network)
2361 return 0;
2362
2363 if (link->network->ipv6_hop_limit < 0)
2364 return 0;
2365
2366 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/hop_limit");
2367 xsprintf(buf, "%i", link->network->ipv6_hop_limit);
2368
2369 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2370 if (r < 0)
2371 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2372
2373 return 0;
2374 }
2375
2376 static int link_drop_foreign_config(Link *link) {
2377 Address *address;
2378 Route *route;
2379 Iterator i;
2380 int r;
2381
2382 SET_FOREACH(address, link->addresses_foreign, i) {
2383 /* we consider IPv6LL addresses to be managed by the kernel */
2384 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2385 continue;
2386
2387 r = address_remove(address, link, link_address_remove_handler);
2388 if (r < 0)
2389 return r;
2390 }
2391
2392 SET_FOREACH(route, link->routes_foreign, i) {
2393 /* do not touch routes managed by the kernel */
2394 if (route->protocol == RTPROT_KERNEL)
2395 continue;
2396
2397 r = route_remove(route, link, link_route_remove_handler);
2398 if (r < 0)
2399 return r;
2400 }
2401
2402 return 0;
2403 }
2404
2405 static int link_drop_config(Link *link) {
2406 Address *address;
2407 Route *route;
2408 Iterator i;
2409 int r;
2410
2411 SET_FOREACH(address, link->addresses, i) {
2412 /* we consider IPv6LL addresses to be managed by the kernel */
2413 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2414 continue;
2415
2416 r = address_remove(address, link, link_address_remove_handler);
2417 if (r < 0)
2418 return r;
2419 }
2420
2421 SET_FOREACH(route, link->routes, i) {
2422 /* do not touch routes managed by the kernel */
2423 if (route->protocol == RTPROT_KERNEL)
2424 continue;
2425
2426 r = route_remove(route, link, link_route_remove_handler);
2427 if (r < 0)
2428 return r;
2429 }
2430
2431 return 0;
2432 }
2433
2434 static int link_update_lldp(Link *link) {
2435 int r;
2436
2437 assert(link);
2438
2439 if (!link->lldp)
2440 return 0;
2441
2442 if (link->flags & IFF_UP) {
2443 r = sd_lldp_start(link->lldp);
2444 if (r > 0)
2445 log_link_debug(link, "Started LLDP.");
2446 } else {
2447 r = sd_lldp_stop(link->lldp);
2448 if (r > 0)
2449 log_link_debug(link, "Stopped LLDP.");
2450 }
2451
2452 return r;
2453 }
2454
2455 static int link_configure(Link *link) {
2456 int r;
2457
2458 assert(link);
2459 assert(link->network);
2460 assert(link->state == LINK_STATE_PENDING);
2461
2462 if (streq_ptr(link->kind, "vcan")) {
2463
2464 if (!(link->flags & IFF_UP)) {
2465 r = link_up_can(link);
2466 if (r < 0) {
2467 link_enter_failed(link);
2468 return r;
2469 }
2470 }
2471
2472 return 0;
2473 }
2474
2475 /* Drop foreign config, but ignore loopback or critical devices.
2476 * We do not want to remove loopback address or addresses used for root NFS. */
2477 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2478 r = link_drop_foreign_config(link);
2479 if (r < 0)
2480 return r;
2481 }
2482
2483 r = link_set_proxy_arp(link);
2484 if (r < 0)
2485 return r;
2486
2487 r = link_set_ipv4_forward(link);
2488 if (r < 0)
2489 return r;
2490
2491 r = link_set_ipv6_forward(link);
2492 if (r < 0)
2493 return r;
2494
2495 r = link_set_ipv6_privacy_extensions(link);
2496 if (r < 0)
2497 return r;
2498
2499 r = link_set_ipv6_accept_ra(link);
2500 if (r < 0)
2501 return r;
2502
2503 r = link_set_ipv6_dad_transmits(link);
2504 if (r < 0)
2505 return r;
2506
2507 r = link_set_ipv6_hop_limit(link);
2508 if (r < 0)
2509 return r;
2510
2511 r = link_set_flags(link);
2512 if (r < 0)
2513 return r;
2514
2515 if (link_ipv4ll_enabled(link)) {
2516 r = ipv4ll_configure(link);
2517 if (r < 0)
2518 return r;
2519 }
2520
2521 if (link_dhcp4_enabled(link)) {
2522 r = dhcp4_configure(link);
2523 if (r < 0)
2524 return r;
2525 }
2526
2527 if (link_dhcp4_server_enabled(link)) {
2528 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2529 if (r < 0)
2530 return r;
2531
2532 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2533 if (r < 0)
2534 return r;
2535 }
2536
2537 if (link_dhcp6_enabled(link) ||
2538 link_ipv6_accept_ra_enabled(link)) {
2539 r = dhcp6_configure(link);
2540 if (r < 0)
2541 return r;
2542 }
2543
2544 if (link_ipv6_accept_ra_enabled(link)) {
2545 r = ndisc_configure(link);
2546 if (r < 0)
2547 return r;
2548 }
2549
2550 if (link_lldp_rx_enabled(link)) {
2551 r = sd_lldp_new(&link->lldp);
2552 if (r < 0)
2553 return r;
2554
2555 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
2556 if (r < 0)
2557 return r;
2558
2559 r = sd_lldp_match_capabilities(link->lldp,
2560 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
2561 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
2562 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
2563 if (r < 0)
2564 return r;
2565
2566 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
2567 if (r < 0)
2568 return r;
2569
2570 r = sd_lldp_attach_event(link->lldp, NULL, 0);
2571 if (r < 0)
2572 return r;
2573
2574 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
2575 if (r < 0)
2576 return r;
2577
2578 r = link_update_lldp(link);
2579 if (r < 0)
2580 return r;
2581 }
2582
2583 if (link_has_carrier(link)) {
2584 r = link_acquire_conf(link);
2585 if (r < 0)
2586 return r;
2587 }
2588
2589 return link_enter_join_netdev(link);
2590 }
2591
2592 static int link_initialized_and_synced(sd_netlink *rtnl, sd_netlink_message *m,
2593 void *userdata) {
2594 _cleanup_link_unref_ Link *link = userdata;
2595 Network *network;
2596 int r;
2597
2598 assert(link);
2599 assert(link->ifname);
2600 assert(link->manager);
2601
2602 if (link->state != LINK_STATE_PENDING)
2603 return 1;
2604
2605 log_link_debug(link, "Link state is up-to-date");
2606
2607 r = link_new_bound_by_list(link);
2608 if (r < 0)
2609 return r;
2610
2611 r = link_handle_bound_by_list(link);
2612 if (r < 0)
2613 return r;
2614
2615 if (!link->network) {
2616 r = network_get(link->manager, link->udev_device, link->ifname,
2617 &link->mac, &network);
2618 if (r == -ENOENT) {
2619 link_enter_unmanaged(link);
2620 return 1;
2621 } else if (r < 0)
2622 return r;
2623
2624 if (link->flags & IFF_LOOPBACK) {
2625 if (network->link_local != ADDRESS_FAMILY_NO)
2626 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2627
2628 if (network->dhcp != ADDRESS_FAMILY_NO)
2629 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2630
2631 if (network->dhcp_server)
2632 log_link_debug(link, "Ignoring DHCP server for loopback link");
2633 }
2634
2635 r = network_apply(link->manager, network, link);
2636 if (r < 0)
2637 return r;
2638 }
2639
2640 r = link_new_bound_to_list(link);
2641 if (r < 0)
2642 return r;
2643
2644 r = link_configure(link);
2645 if (r < 0)
2646 return r;
2647
2648 return 1;
2649 }
2650
2651 int link_initialized(Link *link, struct udev_device *device) {
2652 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2653 int r;
2654
2655 assert(link);
2656 assert(link->manager);
2657 assert(link->manager->rtnl);
2658 assert(device);
2659
2660 if (link->state != LINK_STATE_PENDING)
2661 return 0;
2662
2663 if (link->udev_device)
2664 return 0;
2665
2666 log_link_debug(link, "udev initialized link");
2667
2668 link->udev_device = udev_device_ref(device);
2669
2670 /* udev has initialized the link, but we don't know if we have yet
2671 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2672 * when it returns we know that the pending NEWLINKs have already been
2673 * processed and that we are up-to-date */
2674
2675 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2676 link->ifindex);
2677 if (r < 0)
2678 return r;
2679
2680 r = sd_netlink_call_async(link->manager->rtnl, req,
2681 link_initialized_and_synced, link, 0, NULL);
2682 if (r < 0)
2683 return r;
2684
2685 link_ref(link);
2686
2687 return 0;
2688 }
2689
2690 static int link_load(Link *link) {
2691 _cleanup_free_ char *network_file = NULL,
2692 *addresses = NULL,
2693 *routes = NULL,
2694 *dhcp4_address = NULL,
2695 *ipv4ll_address = NULL;
2696 union in_addr_union address;
2697 union in_addr_union route_dst;
2698 const char *p;
2699 int r;
2700
2701 assert(link);
2702
2703 r = parse_env_file(link->state_file, NEWLINE,
2704 "NETWORK_FILE", &network_file,
2705 "ADDRESSES", &addresses,
2706 "ROUTES", &routes,
2707 "DHCP4_ADDRESS", &dhcp4_address,
2708 "IPV4LL_ADDRESS", &ipv4ll_address,
2709 NULL);
2710 if (r < 0 && r != -ENOENT)
2711 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
2712
2713 if (network_file) {
2714 Network *network;
2715 char *suffix;
2716
2717 /* drop suffix */
2718 suffix = strrchr(network_file, '.');
2719 if (!suffix) {
2720 log_link_debug(link, "Failed to get network name from %s", network_file);
2721 goto network_file_fail;
2722 }
2723 *suffix = '\0';
2724
2725 r = network_get_by_name(link->manager, basename(network_file), &network);
2726 if (r < 0) {
2727 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
2728 goto network_file_fail;
2729 }
2730
2731 r = network_apply(link->manager, network, link);
2732 if (r < 0)
2733 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
2734 }
2735
2736 network_file_fail:
2737
2738 if (addresses) {
2739 p = addresses;
2740
2741 for (;;) {
2742 _cleanup_free_ char *address_str = NULL;
2743 char *prefixlen_str;
2744 int family;
2745 unsigned char prefixlen;
2746
2747 r = extract_first_word(&p, &address_str, NULL, 0);
2748 if (r < 0) {
2749 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
2750 continue;
2751 }
2752 if (r == 0)
2753 break;
2754
2755 prefixlen_str = strchr(address_str, '/');
2756 if (!prefixlen_str) {
2757 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
2758 continue;
2759 }
2760
2761 *prefixlen_str++ = '\0';
2762
2763 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
2764 if (r != 1) {
2765 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
2766 continue;
2767 }
2768
2769 r = in_addr_from_string_auto(address_str, &family, &address);
2770 if (r < 0) {
2771 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
2772 continue;
2773 }
2774
2775 r = address_add(link, family, &address, prefixlen, NULL);
2776 if (r < 0)
2777 return log_link_error_errno(link, r, "Failed to add address: %m");
2778 }
2779 }
2780
2781 if (routes) {
2782 p = routes;
2783
2784 for (;;) {
2785 Route *route;
2786 _cleanup_free_ char *route_str = NULL;
2787 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
2788 usec_t lifetime;
2789 char *prefixlen_str;
2790 int family;
2791 unsigned char prefixlen, tos, table;
2792 uint32_t priority;
2793
2794 r = extract_first_word(&p, &route_str, NULL, 0);
2795 if (r < 0) {
2796 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
2797 continue;
2798 }
2799 if (r == 0)
2800 break;
2801
2802 prefixlen_str = strchr(route_str, '/');
2803 if (!prefixlen_str) {
2804 log_link_debug(link, "Failed to parse route %s", route_str);
2805 continue;
2806 }
2807
2808 *prefixlen_str++ = '\0';
2809
2810 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
2811 if (r != 5) {
2812 log_link_debug(link,
2813 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
2814 prefixlen_str);
2815 continue;
2816 }
2817
2818 r = in_addr_from_string_auto(route_str, &family, &route_dst);
2819 if (r < 0) {
2820 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
2821 continue;
2822 }
2823
2824 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
2825 if (r < 0)
2826 return log_link_error_errno(link, r, "Failed to add route: %m");
2827
2828 if (lifetime != USEC_INFINITY) {
2829 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
2830 0, route_expire_handler, route);
2831 if (r < 0)
2832 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
2833 }
2834
2835 route->lifetime = lifetime;
2836 sd_event_source_unref(route->expire);
2837 route->expire = expire;
2838 expire = NULL;
2839 }
2840 }
2841
2842 if (dhcp4_address) {
2843 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
2844 if (r < 0) {
2845 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
2846 goto dhcp4_address_fail;
2847 }
2848
2849 r = sd_dhcp_client_new(&link->dhcp_client);
2850 if (r < 0)
2851 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
2852
2853 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
2854 if (r < 0)
2855 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
2856 }
2857
2858 dhcp4_address_fail:
2859
2860 if (ipv4ll_address) {
2861 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
2862 if (r < 0) {
2863 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
2864 goto ipv4ll_address_fail;
2865 }
2866
2867 r = sd_ipv4ll_new(&link->ipv4ll);
2868 if (r < 0)
2869 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
2870
2871 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
2872 if (r < 0)
2873 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
2874 }
2875
2876 ipv4ll_address_fail:
2877
2878 return 0;
2879 }
2880
2881 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
2882 Link *link;
2883 _cleanup_udev_device_unref_ struct udev_device *device = NULL;
2884 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
2885 int r;
2886
2887 assert(m);
2888 assert(m->rtnl);
2889 assert(message);
2890 assert(ret);
2891
2892 r = link_new(m, message, ret);
2893 if (r < 0)
2894 return r;
2895
2896 link = *ret;
2897
2898 log_link_debug(link, "Link %d added", link->ifindex);
2899
2900 r = link_load(link);
2901 if (r < 0)
2902 return r;
2903
2904 if (detect_container() <= 0) {
2905 /* not in a container, udev will be around */
2906 sprintf(ifindex_str, "n%d", link->ifindex);
2907 device = udev_device_new_from_device_id(m->udev, ifindex_str);
2908 if (!device) {
2909 r = log_link_warning_errno(link, errno, "Could not find udev device: %m");
2910 goto failed;
2911 }
2912
2913 if (udev_device_get_is_initialized(device) <= 0) {
2914 /* not yet ready */
2915 log_link_debug(link, "link pending udev initialization...");
2916 return 0;
2917 }
2918
2919 r = link_initialized(link, device);
2920 if (r < 0)
2921 goto failed;
2922 } else {
2923 /* we are calling a callback directly, so must take a ref */
2924 link_ref(link);
2925
2926 r = link_initialized_and_synced(m->rtnl, NULL, link);
2927 if (r < 0)
2928 goto failed;
2929 }
2930
2931 return 0;
2932 failed:
2933 link_enter_failed(link);
2934 return r;
2935 }
2936
2937 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
2938 int r;
2939
2940 assert(link);
2941
2942 log_link_info(link, "Gained IPv6LL");
2943
2944 link->ipv6ll_address = *address;
2945 link_check_ready(link);
2946
2947 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
2948 r = link_acquire_ipv6_conf(link);
2949 if (r < 0) {
2950 link_enter_failed(link);
2951 return r;
2952 }
2953 }
2954
2955 return 0;
2956 }
2957
2958 static int link_carrier_gained(Link *link) {
2959 int r;
2960
2961 assert(link);
2962
2963 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
2964 r = link_acquire_conf(link);
2965 if (r < 0) {
2966 link_enter_failed(link);
2967 return r;
2968 }
2969
2970 r = link_enter_set_addresses(link);
2971 if (r < 0)
2972 return r;
2973 }
2974
2975 r = link_handle_bound_by_list(link);
2976 if (r < 0)
2977 return r;
2978
2979 return 0;
2980 }
2981
2982 static int link_carrier_lost(Link *link) {
2983 int r;
2984
2985 assert(link);
2986
2987 r = link_stop_clients(link);
2988 if (r < 0) {
2989 link_enter_failed(link);
2990 return r;
2991 }
2992
2993 r = link_drop_config(link);
2994 if (r < 0)
2995 return r;
2996
2997 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
2998 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
2999 r = link_drop_foreign_config(link);
3000 if (r < 0)
3001 return r;
3002 }
3003
3004 r = link_handle_bound_by_list(link);
3005 if (r < 0)
3006 return r;
3007
3008 return 0;
3009 }
3010
3011 int link_carrier_reset(Link *link) {
3012 int r;
3013
3014 assert(link);
3015
3016 if (link_has_carrier(link)) {
3017 r = link_carrier_lost(link);
3018 if (r < 0)
3019 return r;
3020
3021 r = link_carrier_gained(link);
3022 if (r < 0)
3023 return r;
3024
3025 log_link_info(link, "Reset carrier");
3026 }
3027
3028 return 0;
3029 }
3030
3031 int link_update(Link *link, sd_netlink_message *m) {
3032 struct ether_addr mac;
3033 const char *ifname;
3034 uint32_t mtu;
3035 bool had_carrier, carrier_gained, carrier_lost;
3036 int r;
3037
3038 assert(link);
3039 assert(link->ifname);
3040 assert(m);
3041
3042 if (link->state == LINK_STATE_LINGER) {
3043 link_ref(link);
3044 log_link_info(link, "Link readded");
3045 link_set_state(link, LINK_STATE_ENSLAVING);
3046
3047 r = link_new_carrier_maps(link);
3048 if (r < 0)
3049 return r;
3050 }
3051
3052 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3053 if (r >= 0 && !streq(ifname, link->ifname)) {
3054 log_link_info(link, "Renamed to %s", ifname);
3055
3056 link_free_carrier_maps(link);
3057
3058 r = free_and_strdup(&link->ifname, ifname);
3059 if (r < 0)
3060 return r;
3061
3062 r = link_new_carrier_maps(link);
3063 if (r < 0)
3064 return r;
3065 }
3066
3067 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3068 if (r >= 0 && mtu > 0) {
3069 link->mtu = mtu;
3070 if (!link->original_mtu) {
3071 link->original_mtu = mtu;
3072 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3073 }
3074
3075 if (link->dhcp_client) {
3076 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3077 link->mtu);
3078 if (r < 0) {
3079 log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3080 return r;
3081 }
3082 }
3083 }
3084
3085 /* The kernel may broadcast NEWLINK messages without the MAC address
3086 set, simply ignore them. */
3087 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3088 if (r >= 0) {
3089 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3090 ETH_ALEN)) {
3091
3092 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3093 ETH_ALEN);
3094
3095 log_link_debug(link, "MAC address: "
3096 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3097 mac.ether_addr_octet[0],
3098 mac.ether_addr_octet[1],
3099 mac.ether_addr_octet[2],
3100 mac.ether_addr_octet[3],
3101 mac.ether_addr_octet[4],
3102 mac.ether_addr_octet[5]);
3103
3104 if (link->ipv4ll) {
3105 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3106 if (r < 0)
3107 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3108 }
3109
3110 if (link->dhcp_client) {
3111 const DUID *duid = link_duid(link);
3112
3113 r = sd_dhcp_client_set_mac(link->dhcp_client,
3114 (const uint8_t *) &link->mac,
3115 sizeof (link->mac),
3116 ARPHRD_ETHER);
3117 if (r < 0)
3118 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3119
3120 r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
3121 link->network->iaid,
3122 duid->type,
3123 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3124 duid->raw_data_len);
3125 if (r < 0)
3126 return log_link_warning_errno(link, r, "Could not update DUID/IAID in DHCP client: %m");
3127 }
3128
3129 if (link->dhcp6_client) {
3130 const DUID* duid = link_duid(link);
3131
3132 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3133 (const uint8_t *) &link->mac,
3134 sizeof (link->mac),
3135 ARPHRD_ETHER);
3136 if (r < 0)
3137 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3138
3139 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3140 link->network->iaid);
3141 if (r < 0)
3142 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3143
3144 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3145 duid->type,
3146 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3147 duid->raw_data_len);
3148 if (r < 0)
3149 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3150 }
3151 }
3152 }
3153
3154 had_carrier = link_has_carrier(link);
3155
3156 r = link_update_flags(link, m);
3157 if (r < 0)
3158 return r;
3159
3160 r = link_update_lldp(link);
3161 if (r < 0)
3162 return r;
3163
3164 carrier_gained = !had_carrier && link_has_carrier(link);
3165 carrier_lost = had_carrier && !link_has_carrier(link);
3166
3167 if (carrier_gained) {
3168 log_link_info(link, "Gained carrier");
3169
3170 r = link_carrier_gained(link);
3171 if (r < 0)
3172 return r;
3173 } else if (carrier_lost) {
3174 log_link_info(link, "Lost carrier");
3175
3176 r = link_carrier_lost(link);
3177 if (r < 0)
3178 return r;
3179 }
3180
3181 return 0;
3182 }
3183
3184 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3185 bool space = false;
3186 Iterator i;
3187 Link *link;
3188
3189 assert(f);
3190 assert(prefix);
3191
3192 if (hashmap_isempty(h))
3193 return;
3194
3195 fputs(prefix, f);
3196 HASHMAP_FOREACH(link, h, i) {
3197 if (space)
3198 fputc(' ', f);
3199
3200 fprintf(f, "%i", link->ifindex);
3201 space = true;
3202 }
3203
3204 fputc('\n', f);
3205 }
3206
3207 int link_save(Link *link) {
3208 _cleanup_free_ char *temp_path = NULL;
3209 _cleanup_fclose_ FILE *f = NULL;
3210 const char *admin_state, *oper_state;
3211 Address *a;
3212 Route *route;
3213 Iterator i;
3214 int r;
3215
3216 assert(link);
3217 assert(link->state_file);
3218 assert(link->lease_file);
3219 assert(link->manager);
3220
3221 if (link->state == LINK_STATE_LINGER) {
3222 unlink(link->state_file);
3223 return 0;
3224 }
3225
3226 link_lldp_save(link);
3227
3228 admin_state = link_state_to_string(link->state);
3229 assert(admin_state);
3230
3231 oper_state = link_operstate_to_string(link->operstate);
3232 assert(oper_state);
3233
3234 r = fopen_temporary(link->state_file, &f, &temp_path);
3235 if (r < 0)
3236 goto fail;
3237
3238 fchmod(fileno(f), 0644);
3239
3240 fprintf(f,
3241 "# This is private data. Do not parse.\n"
3242 "ADMIN_STATE=%s\n"
3243 "OPER_STATE=%s\n",
3244 admin_state, oper_state);
3245
3246 if (link->network) {
3247 bool space;
3248 sd_dhcp6_lease *dhcp6_lease = NULL;
3249 const char *dhcp_domainname = NULL;
3250 char **dhcp6_domains = NULL;
3251
3252 if (link->dhcp6_client) {
3253 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3254 if (r < 0 && r != -ENOMSG)
3255 log_link_debug(link, "No DHCPv6 lease");
3256 }
3257
3258 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3259
3260 fputs("DNS=", f);
3261 space = false;
3262 fputstrv(f, link->network->dns, NULL, &space);
3263
3264 if (link->network->dhcp_use_dns &&
3265 link->dhcp_lease) {
3266 const struct in_addr *addresses;
3267
3268 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3269 if (r > 0) {
3270 if (space)
3271 fputc(' ', f);
3272 serialize_in_addrs(f, addresses, r);
3273 space = true;
3274 }
3275 }
3276
3277 if (link->network->dhcp_use_dns && dhcp6_lease) {
3278 struct in6_addr *in6_addrs;
3279
3280 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3281 if (r > 0) {
3282 if (space)
3283 fputc(' ', f);
3284 serialize_in6_addrs(f, in6_addrs, r);
3285 space = true;
3286 }
3287 }
3288
3289 /* Make sure to flush out old entries before we use the NDISC data */
3290 ndisc_vacuum(link);
3291
3292 if (link->network->dhcp_use_dns && link->ndisc_rdnss) {
3293 NDiscRDNSS *dd;
3294
3295 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3296 if (space)
3297 fputc(' ', f);
3298
3299 serialize_in6_addrs(f, &dd->address, 1);
3300 space = true;
3301 }
3302 }
3303
3304 fputc('\n', f);
3305
3306 fputs("NTP=", f);
3307 space = false;
3308 fputstrv(f, link->network->ntp, NULL, &space);
3309
3310 if (link->network->dhcp_use_ntp &&
3311 link->dhcp_lease) {
3312 const struct in_addr *addresses;
3313
3314 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3315 if (r > 0) {
3316 if (space)
3317 fputc(' ', f);
3318 serialize_in_addrs(f, addresses, r);
3319 space = true;
3320 }
3321 }
3322
3323 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3324 struct in6_addr *in6_addrs;
3325 char **hosts;
3326
3327 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3328 &in6_addrs);
3329 if (r > 0) {
3330 if (space)
3331 fputc(' ', f);
3332 serialize_in6_addrs(f, in6_addrs, r);
3333 space = true;
3334 }
3335
3336 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3337 if (r > 0)
3338 fputstrv(f, hosts, NULL, &space);
3339 }
3340
3341 fputc('\n', f);
3342
3343 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3344 if (link->dhcp_lease)
3345 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3346 if (dhcp6_lease)
3347 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3348 }
3349
3350 fputs("DOMAINS=", f);
3351 fputstrv(f, link->network->search_domains, NULL, &space);
3352
3353 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3354 NDiscDNSSL *dd;
3355
3356 if (dhcp_domainname)
3357 fputs_with_space(f, dhcp_domainname, NULL, &space);
3358 if (dhcp6_domains)
3359 fputstrv(f, dhcp6_domains, NULL, &space);
3360
3361 SET_FOREACH(dd, link->ndisc_dnssl, i)
3362 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3363 }
3364
3365 fputc('\n', f);
3366
3367 fputs("ROUTE_DOMAINS=", f);
3368 fputstrv(f, link->network->route_domains, NULL, NULL);
3369
3370 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3371 NDiscDNSSL *dd;
3372
3373 if (dhcp_domainname)
3374 fputs_with_space(f, dhcp_domainname, NULL, &space);
3375 if (dhcp6_domains)
3376 fputstrv(f, dhcp6_domains, NULL, &space);
3377
3378 SET_FOREACH(dd, link->ndisc_dnssl, i)
3379 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3380 }
3381
3382 fputc('\n', f);
3383
3384 fprintf(f, "LLMNR=%s\n",
3385 resolve_support_to_string(link->network->llmnr));
3386 fprintf(f, "MDNS=%s\n",
3387 resolve_support_to_string(link->network->mdns));
3388
3389 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3390 fprintf(f, "DNSSEC=%s\n",
3391 dnssec_mode_to_string(link->network->dnssec_mode));
3392
3393 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3394 const char *n;
3395
3396 fputs("DNSSEC_NTA=", f);
3397 space = false;
3398 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3399 fputs_with_space(f, n, NULL, &space);
3400 fputc('\n', f);
3401 }
3402
3403 fputs("ADDRESSES=", f);
3404 space = false;
3405 SET_FOREACH(a, link->addresses, i) {
3406 _cleanup_free_ char *address_str = NULL;
3407
3408 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3409 if (r < 0)
3410 goto fail;
3411
3412 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3413 space = true;
3414 }
3415 fputc('\n', f);
3416
3417 fputs("ROUTES=", f);
3418 space = false;
3419 SET_FOREACH(route, link->routes, i) {
3420 _cleanup_free_ char *route_str = NULL;
3421
3422 r = in_addr_to_string(route->family, &route->dst, &route_str);
3423 if (r < 0)
3424 goto fail;
3425
3426 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%hhu/"USEC_FMT, space ? " " : "", route_str,
3427 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3428 space = true;
3429 }
3430
3431 fputc('\n', f);
3432 }
3433
3434 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3435 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3436
3437 if (link->dhcp_lease) {
3438 struct in_addr address;
3439 const char *tz = NULL;
3440
3441 assert(link->network);
3442
3443 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3444 if (r >= 0)
3445 fprintf(f, "TIMEZONE=%s\n", tz);
3446
3447 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3448 if (r >= 0) {
3449 fputs("DHCP4_ADDRESS=", f);
3450 serialize_in_addrs(f, &address, 1);
3451 fputc('\n', f);
3452 }
3453
3454 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3455 if (r < 0)
3456 goto fail;
3457
3458 fprintf(f,
3459 "DHCP_LEASE=%s\n",
3460 link->lease_file);
3461 } else
3462 unlink(link->lease_file);
3463
3464 if (link->ipv4ll) {
3465 struct in_addr address;
3466
3467 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3468 if (r >= 0) {
3469 fputs("IPV4LL_ADDRESS=", f);
3470 serialize_in_addrs(f, &address, 1);
3471 fputc('\n', f);
3472 }
3473 }
3474
3475 r = fflush_and_check(f);
3476 if (r < 0)
3477 goto fail;
3478
3479 if (rename(temp_path, link->state_file) < 0) {
3480 r = -errno;
3481 goto fail;
3482 }
3483
3484 return 0;
3485
3486 fail:
3487 (void) unlink(link->state_file);
3488 if (temp_path)
3489 (void) unlink(temp_path);
3490
3491 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3492 }
3493
3494 /* The serialized state in /run is no longer up-to-date. */
3495 void link_dirty(Link *link) {
3496 int r;
3497
3498 assert(link);
3499
3500 /* mark manager dirty as link is dirty */
3501 manager_dirty(link->manager);
3502
3503 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3504 if (r < 0)
3505 /* allocation errors are ignored */
3506 return;
3507
3508 r = set_put(link->manager->dirty_links, link);
3509 if (r <= 0)
3510 /* don't take another ref if the link was already dirty */
3511 return;
3512
3513 link_ref(link);
3514 }
3515
3516 /* The serialized state in /run is up-to-date */
3517 void link_clean(Link *link) {
3518 assert(link);
3519 assert(link->manager);
3520
3521 set_remove(link->manager->dirty_links, link);
3522 link_unref(link);
3523 }
3524
3525 static const char* const link_state_table[_LINK_STATE_MAX] = {
3526 [LINK_STATE_PENDING] = "pending",
3527 [LINK_STATE_ENSLAVING] = "configuring",
3528 [LINK_STATE_SETTING_ADDRESSES] = "configuring",
3529 [LINK_STATE_SETTING_ROUTES] = "configuring",
3530 [LINK_STATE_CONFIGURED] = "configured",
3531 [LINK_STATE_UNMANAGED] = "unmanaged",
3532 [LINK_STATE_FAILED] = "failed",
3533 [LINK_STATE_LINGER] = "linger",
3534 };
3535
3536 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
3537
3538 static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
3539 [LINK_OPERSTATE_OFF] = "off",
3540 [LINK_OPERSTATE_NO_CARRIER] = "no-carrier",
3541 [LINK_OPERSTATE_DORMANT] = "dormant",
3542 [LINK_OPERSTATE_CARRIER] = "carrier",
3543 [LINK_OPERSTATE_DEGRADED] = "degraded",
3544 [LINK_OPERSTATE_ROUTABLE] = "routable",
3545 };
3546
3547 DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
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