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