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networkd: do not drop config for unmanaged interfaces
[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_enter_set_addresses(Link *link) {
946 Address *ad;
947 int r;
948
949 assert(link);
950 assert(link->network);
951 assert(link->state != _LINK_STATE_INVALID);
952
953 link_set_state(link, LINK_STATE_SETTING_ADDRESSES);
954
955 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
956 r = address_configure(ad, link, address_handler, false);
957 if (r < 0) {
958 log_link_warning_errno(link, r, "Could not set addresses: %m");
959 link_enter_failed(link);
960 return r;
961 }
962
963 link->link_messages++;
964 }
965
966 /* now that we can figure out a default address for the dhcp server,
967 start it */
968 if (link_dhcp4_server_enabled(link)) {
969 Address *address;
970 Link *uplink = NULL;
971 bool acquired_uplink = false;
972
973 address = link_find_dhcp_server_address(link);
974 if (!address) {
975 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
976 link_enter_failed(link);
977 return 0;
978 }
979
980 /* use the server address' subnet as the pool */
981 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
982 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
983 if (r < 0)
984 return r;
985
986 /* TODO:
987 r = sd_dhcp_server_set_router(link->dhcp_server,
988 &main_address->in_addr.in);
989 if (r < 0)
990 return r;
991 */
992
993 if (link->network->dhcp_server_max_lease_time_usec > 0) {
994 r = sd_dhcp_server_set_max_lease_time(
995 link->dhcp_server,
996 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
997 if (r < 0)
998 return r;
999 }
1000
1001 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1002 r = sd_dhcp_server_set_default_lease_time(
1003 link->dhcp_server,
1004 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1005 if (r < 0)
1006 return r;
1007 }
1008
1009 if (link->network->dhcp_server_emit_dns) {
1010
1011 if (link->network->n_dhcp_server_dns > 0)
1012 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1013 else {
1014 uplink = manager_find_uplink(link->manager, link);
1015 acquired_uplink = true;
1016
1017 if (!uplink) {
1018 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1019 r = 0;
1020 } else
1021 r = link_push_dns_to_dhcp_server(uplink, link->dhcp_server);
1022 }
1023 if (r < 0)
1024 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1025 }
1026
1027
1028 if (link->network->dhcp_server_emit_ntp) {
1029
1030 if (link->network->n_dhcp_server_ntp > 0)
1031 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1032 else {
1033 if (!acquired_uplink)
1034 uplink = manager_find_uplink(link->manager, link);
1035
1036 if (!uplink) {
1037 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1038 r = 0;
1039 } else
1040 r = link_push_ntp_to_dhcp_server(uplink, link->dhcp_server);
1041
1042 }
1043 if (r < 0)
1044 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1045 }
1046
1047 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1048 if (r < 0) {
1049 log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1050 return r;
1051 }
1052
1053 if (link->network->dhcp_server_emit_timezone) {
1054 _cleanup_free_ char *buffer = NULL;
1055 const char *tz = NULL;
1056
1057 if (link->network->dhcp_server_timezone)
1058 tz = link->network->dhcp_server_timezone;
1059 else {
1060 r = get_timezone(&buffer);
1061 if (r < 0)
1062 log_warning_errno(r, "Failed to determine timezone: %m");
1063 else
1064 tz = buffer;
1065 }
1066
1067 if (tz) {
1068 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1069 if (r < 0)
1070 return r;
1071 }
1072 }
1073
1074 r = sd_dhcp_server_start(link->dhcp_server);
1075 if (r < 0) {
1076 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1077
1078 link_enter_failed(link);
1079
1080 return 0;
1081 }
1082
1083 log_link_debug(link, "Offering DHCPv4 leases");
1084 }
1085
1086 if (link->link_messages == 0)
1087 link_enter_set_routes(link);
1088 else
1089 log_link_debug(link, "Setting addresses");
1090
1091 return 0;
1092 }
1093
1094 int link_address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1095 _cleanup_link_unref_ Link *link = userdata;
1096 int r;
1097
1098 assert(m);
1099 assert(link);
1100 assert(link->ifname);
1101
1102 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1103 return 1;
1104
1105 r = sd_netlink_message_get_errno(m);
1106 if (r < 0 && r != -EADDRNOTAVAIL)
1107 log_link_warning_errno(link, r, "Could not drop address: %m");
1108
1109 return 1;
1110 }
1111
1112 static int link_set_bridge_vlan(Link *link) {
1113 int r = 0;
1114
1115 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1116 if (r < 0)
1117 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1118
1119 return r;
1120 }
1121
1122 static int link_set_bridge_fdb(Link *link) {
1123 FdbEntry *fdb_entry;
1124 int r = 0;
1125
1126 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1127 r = fdb_entry_configure(link, fdb_entry);
1128 if (r < 0) {
1129 log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1130 break;
1131 }
1132 }
1133
1134 return r;
1135 }
1136
1137 static int link_set_proxy_arp(Link *link) {
1138 const char *p = NULL;
1139 int r;
1140
1141 if (!link_proxy_arp_enabled(link))
1142 return 0;
1143
1144 p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/proxy_arp");
1145
1146 r = write_string_file(p, one_zero(link->network->proxy_arp), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
1147 if (r < 0)
1148 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1149
1150 return 0;
1151 }
1152
1153 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1154 _cleanup_link_unref_ Link *link = userdata;
1155 int r;
1156
1157 log_link_debug(link, "Set link");
1158
1159 r = sd_netlink_message_get_errno(m);
1160 if (r < 0 && r != -EEXIST) {
1161 log_link_error_errno(link, r, "Could not join netdev: %m");
1162 link_enter_failed(link);
1163 return 1;
1164 }
1165
1166 return 0;
1167 }
1168
1169 static int set_hostname_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
1170 _cleanup_link_unref_ Link *link = userdata;
1171 const sd_bus_error *e;
1172
1173 assert(m);
1174 assert(link);
1175
1176 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1177 return 1;
1178
1179 e = sd_bus_message_get_error(m);
1180 if (e)
1181 log_link_warning_errno(link, sd_bus_error_get_errno(e), "Could not set hostname: %s", e->message);
1182
1183 return 1;
1184 }
1185
1186 int link_set_hostname(Link *link, const char *hostname) {
1187 int r;
1188
1189 assert(link);
1190 assert(link->manager);
1191
1192 log_link_debug(link, "Setting transient hostname: '%s'", strna(hostname));
1193
1194 if (!link->manager->bus) {
1195 /* TODO: replace by assert when we can rely on kdbus */
1196 log_link_info(link, "Not connected to system bus, ignoring transient hostname.");
1197 return 0;
1198 }
1199
1200 r = sd_bus_call_method_async(
1201 link->manager->bus,
1202 NULL,
1203 "org.freedesktop.hostname1",
1204 "/org/freedesktop/hostname1",
1205 "org.freedesktop.hostname1",
1206 "SetHostname",
1207 set_hostname_handler,
1208 link,
1209 "sb",
1210 hostname,
1211 false);
1212
1213 if (r < 0)
1214 return log_link_error_errno(link, r, "Could not set transient hostname: %m");
1215
1216 link_ref(link);
1217
1218 return 0;
1219 }
1220
1221 static int set_timezone_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
1222 _cleanup_link_unref_ Link *link = userdata;
1223 const sd_bus_error *e;
1224
1225 assert(m);
1226 assert(link);
1227
1228 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1229 return 1;
1230
1231 e = sd_bus_message_get_error(m);
1232 if (e)
1233 log_link_warning_errno(link, sd_bus_error_get_errno(e), "Could not set timezone: %s", e->message);
1234
1235 return 1;
1236 }
1237
1238 int link_set_timezone(Link *link, const char *tz) {
1239 int r;
1240
1241 assert(link);
1242 assert(link->manager);
1243 assert(tz);
1244
1245 log_link_debug(link, "Setting system timezone: '%s'", tz);
1246
1247 if (!link->manager->bus) {
1248 log_link_info(link, "Not connected to system bus, ignoring timezone.");
1249 return 0;
1250 }
1251
1252 r = sd_bus_call_method_async(
1253 link->manager->bus,
1254 NULL,
1255 "org.freedesktop.timedate1",
1256 "/org/freedesktop/timedate1",
1257 "org.freedesktop.timedate1",
1258 "SetTimezone",
1259 set_timezone_handler,
1260 link,
1261 "sb",
1262 tz,
1263 false);
1264 if (r < 0)
1265 return log_link_error_errno(link, r, "Could not set timezone: %m");
1266
1267 link_ref(link);
1268
1269 return 0;
1270 }
1271
1272 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1273 _cleanup_link_unref_ Link *link = userdata;
1274 int r;
1275
1276 assert(m);
1277 assert(link);
1278 assert(link->ifname);
1279
1280 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1281 return 1;
1282
1283 r = sd_netlink_message_get_errno(m);
1284 if (r < 0)
1285 log_link_warning_errno(link, r, "Could not set MTU: %m");
1286
1287 return 1;
1288 }
1289
1290 int link_set_mtu(Link *link, uint32_t mtu) {
1291 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1292 int r;
1293
1294 assert(link);
1295 assert(link->manager);
1296 assert(link->manager->rtnl);
1297
1298 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1299
1300 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1301 if (r < 0)
1302 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1303
1304 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1305 if (r < 0)
1306 return log_link_error_errno(link, r, "Could not append MTU: %m");
1307
1308 r = sd_netlink_call_async(link->manager->rtnl, req, set_mtu_handler, link, 0, NULL);
1309 if (r < 0)
1310 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1311
1312 link_ref(link);
1313
1314 return 0;
1315 }
1316
1317 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1318 _cleanup_link_unref_ Link *link = userdata;
1319 int r;
1320
1321 assert(m);
1322 assert(link);
1323 assert(link->ifname);
1324
1325 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1326 return 1;
1327
1328 r = sd_netlink_message_get_errno(m);
1329 if (r < 0)
1330 log_link_warning_errno(link, r, "Could not set link flags: %m");
1331
1332 return 1;
1333 }
1334
1335 static int link_set_flags(Link *link) {
1336 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1337 unsigned ifi_change = 0;
1338 unsigned ifi_flags = 0;
1339 int r;
1340
1341 assert(link);
1342 assert(link->manager);
1343 assert(link->manager->rtnl);
1344
1345 if (link->flags & IFF_LOOPBACK)
1346 return 0;
1347
1348 if (!link->network)
1349 return 0;
1350
1351 if (link->network->arp < 0)
1352 return 0;
1353
1354 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1355 if (r < 0)
1356 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1357
1358 if (link->network->arp >= 0) {
1359 ifi_change |= IFF_NOARP;
1360 ifi_flags |= link->network->arp ? 0 : IFF_NOARP;
1361 }
1362
1363 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1364 if (r < 0)
1365 return log_link_error_errno(link, r, "Could not set link flags: %m");
1366
1367 r = sd_netlink_call_async(link->manager->rtnl, req, set_flags_handler, link, 0, NULL);
1368 if (r < 0)
1369 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1370
1371 link_ref(link);
1372
1373 return 0;
1374 }
1375
1376 static int link_set_bridge(Link *link) {
1377 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1378 int r;
1379
1380 assert(link);
1381 assert(link->network);
1382
1383 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1384 if (r < 0)
1385 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1386
1387 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1388 if (r < 0)
1389 return log_link_error_errno(link, r, "Could not set message family: %m");
1390
1391 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1392 if (r < 0)
1393 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1394
1395 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, !link->network->use_bpdu);
1396 if (r < 0)
1397 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1398
1399 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1400 if (r < 0)
1401 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1402
1403 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1404 if (r < 0)
1405 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1406
1407 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, !link->network->allow_port_to_be_root);
1408 if (r < 0)
1409 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1410
1411 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1412 if (r < 0)
1413 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1414
1415 if (link->network->cost != 0) {
1416 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1417 if (r < 0)
1418 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1419 }
1420
1421 r = sd_netlink_message_close_container(req);
1422 if (r < 0)
1423 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1424
1425 r = sd_netlink_call_async(link->manager->rtnl, req, link_set_handler, link, 0, NULL);
1426 if (r < 0)
1427 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1428
1429 link_ref(link);
1430
1431 return r;
1432 }
1433
1434 static int link_lldp_save(Link *link) {
1435 _cleanup_free_ char *temp_path = NULL;
1436 _cleanup_fclose_ FILE *f = NULL;
1437 sd_lldp_neighbor **l = NULL;
1438 int n = 0, r, i;
1439
1440 assert(link);
1441 assert(link->lldp_file);
1442
1443 if (!link->lldp) {
1444 (void) unlink(link->lldp_file);
1445 return 0;
1446 }
1447
1448 r = sd_lldp_get_neighbors(link->lldp, &l);
1449 if (r < 0)
1450 goto finish;
1451 if (r == 0) {
1452 (void) unlink(link->lldp_file);
1453 goto finish;
1454 }
1455
1456 n = r;
1457
1458 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1459 if (r < 0)
1460 goto finish;
1461
1462 fchmod(fileno(f), 0644);
1463
1464 for (i = 0; i < n; i++) {
1465 const void *p;
1466 le64_t u;
1467 size_t sz;
1468
1469 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1470 if (r < 0)
1471 goto finish;
1472
1473 u = htole64(sz);
1474 (void) fwrite(&u, 1, sizeof(u), f);
1475 (void) fwrite(p, 1, sz, f);
1476 }
1477
1478 r = fflush_and_check(f);
1479 if (r < 0)
1480 goto finish;
1481
1482 if (rename(temp_path, link->lldp_file) < 0) {
1483 r = -errno;
1484 goto finish;
1485 }
1486
1487 finish:
1488 if (r < 0) {
1489 (void) unlink(link->lldp_file);
1490 if (temp_path)
1491 (void) unlink(temp_path);
1492
1493 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1494 }
1495
1496 if (l) {
1497 for (i = 0; i < n; i++)
1498 sd_lldp_neighbor_unref(l[i]);
1499 free(l);
1500 }
1501
1502 return r;
1503 }
1504
1505 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1506 Link *link = userdata;
1507 int r;
1508
1509 assert(link);
1510
1511 (void) link_lldp_save(link);
1512
1513 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1514 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1515
1516 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1517
1518 r = link_lldp_emit_start(link);
1519 if (r < 0)
1520 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1521 }
1522 }
1523
1524 static int link_acquire_ipv6_conf(Link *link) {
1525 int r;
1526
1527 assert(link);
1528
1529 if (link_dhcp6_enabled(link)) {
1530 assert(link->dhcp6_client);
1531 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1532
1533 /* start DHCPv6 client in stateless mode */
1534 r = dhcp6_request_address(link, true);
1535 if (r < 0 && r != -EBUSY)
1536 return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m");
1537 else
1538 log_link_debug(link, "Acquiring DHCPv6 lease");
1539 }
1540
1541 if (link_ipv6_accept_ra_enabled(link)) {
1542 assert(link->ndisc);
1543
1544 log_link_debug(link, "Discovering IPv6 routers");
1545
1546 r = sd_ndisc_start(link->ndisc);
1547 if (r < 0 && r != -EBUSY)
1548 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1549 }
1550
1551 return 0;
1552 }
1553
1554 static int link_acquire_ipv4_conf(Link *link) {
1555 int r;
1556
1557 assert(link);
1558 assert(link->network);
1559 assert(link->manager);
1560 assert(link->manager->event);
1561
1562 if (link_ipv4ll_enabled(link)) {
1563 assert(link->ipv4ll);
1564
1565 log_link_debug(link, "Acquiring IPv4 link-local address");
1566
1567 r = sd_ipv4ll_start(link->ipv4ll);
1568 if (r < 0)
1569 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1570 }
1571
1572 if (link_dhcp4_enabled(link)) {
1573 assert(link->dhcp_client);
1574
1575 log_link_debug(link, "Acquiring DHCPv4 lease");
1576
1577 r = sd_dhcp_client_start(link->dhcp_client);
1578 if (r < 0)
1579 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1580 }
1581
1582 return 0;
1583 }
1584
1585 static int link_acquire_conf(Link *link) {
1586 int r;
1587
1588 assert(link);
1589
1590 r = link_acquire_ipv4_conf(link);
1591 if (r < 0)
1592 return r;
1593
1594 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) == 0) {
1595 r = link_acquire_ipv6_conf(link);
1596 if (r < 0)
1597 return r;
1598 }
1599
1600 if (link_lldp_emit_enabled(link)) {
1601 r = link_lldp_emit_start(link);
1602 if (r < 0)
1603 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1604 }
1605
1606 return 0;
1607 }
1608
1609 bool link_has_carrier(Link *link) {
1610 /* see Documentation/networking/operstates.txt in the kernel sources */
1611
1612 if (link->kernel_operstate == IF_OPER_UP)
1613 return true;
1614
1615 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1616 /* operstate may not be implemented, so fall back to flags */
1617 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1618 return true;
1619
1620 return false;
1621 }
1622
1623 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1624 _cleanup_link_unref_ Link *link = userdata;
1625 int r;
1626
1627 assert(link);
1628
1629 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1630 return 1;
1631
1632 r = sd_netlink_message_get_errno(m);
1633 if (r < 0)
1634 /* we warn but don't fail the link, as it may be
1635 brought up later */
1636 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1637
1638 return 1;
1639 }
1640
1641 static int link_up(Link *link) {
1642 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1643 uint8_t ipv6ll_mode;
1644 int r;
1645
1646 assert(link);
1647 assert(link->network);
1648 assert(link->manager);
1649 assert(link->manager->rtnl);
1650
1651 log_link_debug(link, "Bringing link up");
1652
1653 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1654 if (r < 0)
1655 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1656
1657 /* set it free if not enslaved with networkd */
1658 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1659 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1660 if (r < 0)
1661 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1662 }
1663
1664 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1665 if (r < 0)
1666 return log_link_error_errno(link, r, "Could not set link flags: %m");
1667
1668 if (link->network->mac) {
1669 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1670 if (r < 0)
1671 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1672 }
1673
1674 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1675 for this interface, or if it is a bridge slave, then disable IPv6 else enable it. */
1676 (void) link_enable_ipv6(link);
1677
1678 if (link->network->mtu) {
1679 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1680 on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1681 if (link_ipv6_enabled(link) && link->network->mtu < IPV6_MIN_MTU) {
1682
1683 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1684 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1685
1686 link->network->mtu = IPV6_MIN_MTU;
1687 }
1688
1689 r = sd_netlink_message_append_u32(req, IFLA_MTU, link->network->mtu);
1690 if (r < 0)
1691 return log_link_error_errno(link, r, "Could not set MTU: %m");
1692 }
1693
1694 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1695 if (r < 0)
1696 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1697
1698 if (link_ipv6_enabled(link)) {
1699 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
1700 r = sd_netlink_message_open_container(req, AF_INET6);
1701 if (r < 0)
1702 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1703
1704 if (!link_ipv6ll_enabled(link))
1705 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1706 else {
1707 const char *p = NULL;
1708 _cleanup_free_ char *stable_secret = NULL;
1709
1710 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/stable_secret");
1711 r = read_one_line_file(p, &stable_secret);
1712
1713 if (r < 0)
1714 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1715 else
1716 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1717 }
1718 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1719 if (r < 0)
1720 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1721
1722 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
1723 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
1724 if (r < 0)
1725 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
1726 }
1727
1728 r = sd_netlink_message_close_container(req);
1729 if (r < 0)
1730 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1731 }
1732
1733 r = sd_netlink_message_close_container(req);
1734 if (r < 0)
1735 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1736
1737 r = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
1738 if (r < 0)
1739 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1740
1741 link_ref(link);
1742
1743 return 0;
1744 }
1745
1746 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1747 _cleanup_link_unref_ Link *link = userdata;
1748 int r;
1749
1750 assert(link);
1751
1752 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1753 return 1;
1754
1755 r = sd_netlink_message_get_errno(m);
1756 if (r < 0)
1757 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1758
1759 return 1;
1760 }
1761
1762 static int link_down(Link *link) {
1763 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1764 int r;
1765
1766 assert(link);
1767 assert(link->manager);
1768 assert(link->manager->rtnl);
1769
1770 log_link_debug(link, "Bringing link down");
1771
1772 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1773 RTM_SETLINK, link->ifindex);
1774 if (r < 0)
1775 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1776
1777 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1778 if (r < 0)
1779 return log_link_error_errno(link, r, "Could not set link flags: %m");
1780
1781 r = sd_netlink_call_async(link->manager->rtnl, req, link_down_handler, link, 0, NULL);
1782 if (r < 0)
1783 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1784
1785 link_ref(link);
1786
1787 return 0;
1788 }
1789
1790 static int link_handle_bound_to_list(Link *link) {
1791 Link *l;
1792 Iterator i;
1793 int r;
1794 bool required_up = false;
1795 bool link_is_up = false;
1796
1797 assert(link);
1798
1799 if (hashmap_isempty(link->bound_to_links))
1800 return 0;
1801
1802 if (link->flags & IFF_UP)
1803 link_is_up = true;
1804
1805 HASHMAP_FOREACH (l, link->bound_to_links, i)
1806 if (link_has_carrier(l)) {
1807 required_up = true;
1808 break;
1809 }
1810
1811 if (!required_up && link_is_up) {
1812 r = link_down(link);
1813 if (r < 0)
1814 return r;
1815 } else if (required_up && !link_is_up) {
1816 r = link_up(link);
1817 if (r < 0)
1818 return r;
1819 }
1820
1821 return 0;
1822 }
1823
1824 static int link_handle_bound_by_list(Link *link) {
1825 Iterator i;
1826 Link *l;
1827 int r;
1828
1829 assert(link);
1830
1831 if (hashmap_isempty(link->bound_by_links))
1832 return 0;
1833
1834 HASHMAP_FOREACH (l, link->bound_by_links, i) {
1835 r = link_handle_bound_to_list(l);
1836 if (r < 0)
1837 return r;
1838 }
1839
1840 return 0;
1841 }
1842
1843 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1844 int r;
1845
1846 assert(link);
1847 assert(carrier);
1848
1849 if (link == carrier)
1850 return 0;
1851
1852 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1853 return 0;
1854
1855 r = hashmap_ensure_allocated(h, NULL);
1856 if (r < 0)
1857 return r;
1858
1859 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1860 if (r < 0)
1861 return r;
1862
1863 return 0;
1864 }
1865
1866 static int link_new_bound_by_list(Link *link) {
1867 Manager *m;
1868 Link *carrier;
1869 Iterator i;
1870 int r;
1871 bool list_updated = false;
1872
1873 assert(link);
1874 assert(link->manager);
1875
1876 m = link->manager;
1877
1878 HASHMAP_FOREACH(carrier, m->links, i) {
1879 if (!carrier->network)
1880 continue;
1881
1882 if (strv_isempty(carrier->network->bind_carrier))
1883 continue;
1884
1885 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
1886 r = link_put_carrier(link, carrier, &link->bound_by_links);
1887 if (r < 0)
1888 return r;
1889
1890 list_updated = true;
1891 }
1892 }
1893
1894 if (list_updated)
1895 link_dirty(link);
1896
1897 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
1898 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1899 if (r < 0)
1900 return r;
1901
1902 link_dirty(carrier);
1903 }
1904
1905 return 0;
1906 }
1907
1908 static int link_new_bound_to_list(Link *link) {
1909 Manager *m;
1910 Link *carrier;
1911 Iterator i;
1912 int r;
1913 bool list_updated = false;
1914
1915 assert(link);
1916 assert(link->manager);
1917
1918 if (!link->network)
1919 return 0;
1920
1921 if (strv_isempty(link->network->bind_carrier))
1922 return 0;
1923
1924 m = link->manager;
1925
1926 HASHMAP_FOREACH (carrier, m->links, i) {
1927 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
1928 r = link_put_carrier(link, carrier, &link->bound_to_links);
1929 if (r < 0)
1930 return r;
1931
1932 list_updated = true;
1933 }
1934 }
1935
1936 if (list_updated)
1937 link_dirty(link);
1938
1939 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
1940 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
1941 if (r < 0)
1942 return r;
1943
1944 link_dirty(carrier);
1945 }
1946
1947 return 0;
1948 }
1949
1950 static int link_new_carrier_maps(Link *link) {
1951 int r;
1952
1953 r = link_new_bound_by_list(link);
1954 if (r < 0)
1955 return r;
1956
1957 r = link_handle_bound_by_list(link);
1958 if (r < 0)
1959 return r;
1960
1961 r = link_new_bound_to_list(link);
1962 if (r < 0)
1963 return r;
1964
1965 r = link_handle_bound_to_list(link);
1966 if (r < 0)
1967 return r;
1968
1969 return 0;
1970 }
1971
1972 static void link_free_bound_to_list(Link *link) {
1973 Link *bound_to;
1974 Iterator i;
1975
1976 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
1977 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
1978
1979 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
1980 link_dirty(bound_to);
1981 }
1982
1983 return;
1984 }
1985
1986 static void link_free_bound_by_list(Link *link) {
1987 Link *bound_by;
1988 Iterator i;
1989
1990 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
1991 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
1992
1993 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
1994 link_dirty(bound_by);
1995 link_handle_bound_to_list(bound_by);
1996 }
1997 }
1998
1999 return;
2000 }
2001
2002 static void link_free_carrier_maps(Link *link) {
2003 bool list_updated = false;
2004
2005 assert(link);
2006
2007 if (!hashmap_isempty(link->bound_to_links)) {
2008 link_free_bound_to_list(link);
2009 list_updated = true;
2010 }
2011
2012 if (!hashmap_isempty(link->bound_by_links)) {
2013 link_free_bound_by_list(link);
2014 list_updated = true;
2015 }
2016
2017 if (list_updated)
2018 link_dirty(link);
2019
2020 return;
2021 }
2022
2023 void link_drop(Link *link) {
2024 if (!link || link->state == LINK_STATE_LINGER)
2025 return;
2026
2027 link_set_state(link, LINK_STATE_LINGER);
2028
2029 link_free_carrier_maps(link);
2030
2031 log_link_debug(link, "Link removed");
2032
2033 (void)unlink(link->state_file);
2034 link_unref(link);
2035
2036 return;
2037 }
2038
2039 static int link_joined(Link *link) {
2040 int r;
2041
2042 assert(link);
2043 assert(link->network);
2044
2045 if (!hashmap_isempty(link->bound_to_links)) {
2046 r = link_handle_bound_to_list(link);
2047 if (r < 0)
2048 return r;
2049 } else if (!(link->flags & IFF_UP)) {
2050 r = link_up(link);
2051 if (r < 0) {
2052 link_enter_failed(link);
2053 return r;
2054 }
2055 }
2056
2057 if (link->network->bridge) {
2058 r = link_set_bridge(link);
2059 if (r < 0)
2060 log_link_error_errno(link, r, "Could not set bridge message: %m");
2061 }
2062
2063 if (link->network->use_br_vlan &&
2064 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2065 r = link_set_bridge_vlan(link);
2066 if (r < 0)
2067 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2068 }
2069
2070 return link_enter_set_addresses(link);
2071 }
2072
2073 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
2074 _cleanup_link_unref_ Link *link = userdata;
2075 int r;
2076
2077 assert(link);
2078 assert(link->network);
2079
2080 link->enslaving--;
2081
2082 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2083 return 1;
2084
2085 r = sd_netlink_message_get_errno(m);
2086 if (r < 0 && r != -EEXIST) {
2087 log_link_error_errno(link, r, "Could not join netdev: %m");
2088 link_enter_failed(link);
2089 return 1;
2090 } else
2091 log_link_debug(link, "Joined netdev");
2092
2093 if (link->enslaving <= 0)
2094 link_joined(link);
2095
2096 return 1;
2097 }
2098
2099 static int link_enter_join_netdev(Link *link) {
2100 NetDev *netdev;
2101 Iterator i;
2102 int r;
2103
2104 assert(link);
2105 assert(link->network);
2106 assert(link->state == LINK_STATE_PENDING);
2107
2108 link_set_state(link, LINK_STATE_ENSLAVING);
2109
2110 link_dirty(link);
2111
2112 if (!link->network->bridge &&
2113 !link->network->bond &&
2114 !link->network->vrf &&
2115 hashmap_isempty(link->network->stacked_netdevs))
2116 return link_joined(link);
2117
2118 if (link->network->bond) {
2119 log_struct(LOG_DEBUG,
2120 LOG_LINK_INTERFACE(link),
2121 LOG_NETDEV_INTERFACE(link->network->bond),
2122 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname),
2123 NULL);
2124
2125 r = netdev_join(link->network->bond, link, netdev_join_handler);
2126 if (r < 0) {
2127 log_struct_errno(LOG_WARNING, r,
2128 LOG_LINK_INTERFACE(link),
2129 LOG_NETDEV_INTERFACE(link->network->bond),
2130 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname),
2131 NULL);
2132
2133 link_enter_failed(link);
2134 return r;
2135 }
2136
2137 link->enslaving++;
2138 }
2139
2140 if (link->network->bridge) {
2141 log_struct(LOG_DEBUG,
2142 LOG_LINK_INTERFACE(link),
2143 LOG_NETDEV_INTERFACE(link->network->bridge),
2144 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname),
2145 NULL);
2146
2147 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2148 if (r < 0) {
2149 log_struct_errno(LOG_WARNING, r,
2150 LOG_LINK_INTERFACE(link),
2151 LOG_NETDEV_INTERFACE(link->network->bridge),
2152 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname),
2153 NULL),
2154 link_enter_failed(link);
2155 return r;
2156 }
2157
2158 link->enslaving++;
2159 }
2160
2161 if (link->network->vrf) {
2162 log_struct(LOG_DEBUG,
2163 LOG_LINK_INTERFACE(link),
2164 LOG_NETDEV_INTERFACE(link->network->vrf),
2165 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname),
2166 NULL);
2167 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2168 if (r < 0) {
2169 log_struct_errno(LOG_WARNING, r,
2170 LOG_LINK_INTERFACE(link),
2171 LOG_NETDEV_INTERFACE(link->network->vrf),
2172 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname),
2173 NULL);
2174 link_enter_failed(link);
2175 return r;
2176 }
2177
2178 link->enslaving++;
2179 }
2180
2181 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2182
2183 log_struct(LOG_DEBUG,
2184 LOG_LINK_INTERFACE(link),
2185 LOG_NETDEV_INTERFACE(netdev),
2186 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname),
2187 NULL);
2188
2189 r = netdev_join(netdev, link, netdev_join_handler);
2190 if (r < 0) {
2191 log_struct_errno(LOG_WARNING, r,
2192 LOG_LINK_INTERFACE(link),
2193 LOG_NETDEV_INTERFACE(netdev),
2194 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname),
2195 NULL);
2196 link_enter_failed(link);
2197 return r;
2198 }
2199
2200 link->enslaving++;
2201 }
2202
2203 return 0;
2204 }
2205
2206 static int link_set_ipv4_forward(Link *link) {
2207 int r;
2208
2209 if (!link_ipv4_forward_enabled(link))
2210 return 0;
2211
2212 /* We propagate the forwarding flag from one interface to the
2213 * global setting one way. This means: as long as at least one
2214 * interface was configured at any time that had IP forwarding
2215 * enabled the setting will stay on for good. We do this
2216 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2217 * somewhat in sync (see below). */
2218
2219 r = write_string_file("/proc/sys/net/ipv4/ip_forward", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2220 if (r < 0)
2221 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2222
2223 return 0;
2224 }
2225
2226 static int link_set_ipv6_forward(Link *link) {
2227 int r;
2228
2229 if (!link_ipv6_forward_enabled(link))
2230 return 0;
2231
2232 /* On Linux, the IPv6 stack does not know a per-interface
2233 * packet forwarding setting: either packet forwarding is on
2234 * for all, or off for all. We hence don't bother with a
2235 * per-interface setting, but simply propagate the interface
2236 * flag, if it is set, to the global flag, one-way. Note that
2237 * while IPv4 would allow a per-interface flag, we expose the
2238 * same behaviour there and also propagate the setting from
2239 * one to all, to keep things simple (see above). */
2240
2241 r = write_string_file("/proc/sys/net/ipv6/conf/all/forwarding", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2242 if (r < 0)
2243 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2244
2245 return 0;
2246 }
2247
2248 static int link_set_ipv6_privacy_extensions(Link *link) {
2249 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2250 IPv6PrivacyExtensions s;
2251 const char *p = NULL;
2252 int r;
2253
2254 s = link_ipv6_privacy_extensions(link);
2255 if (s < 0)
2256 return 0;
2257
2258 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/use_tempaddr");
2259 xsprintf(buf, "%u", (unsigned) link->network->ipv6_privacy_extensions);
2260
2261 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2262 if (r < 0)
2263 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2264
2265 return 0;
2266 }
2267
2268 static int link_set_ipv6_accept_ra(Link *link) {
2269 const char *p = NULL;
2270 int r;
2271
2272 /* Make this a NOP if IPv6 is not available */
2273 if (!socket_ipv6_is_supported())
2274 return 0;
2275
2276 if (link->flags & IFF_LOOPBACK)
2277 return 0;
2278
2279 if (!link->network)
2280 return 0;
2281
2282 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/accept_ra");
2283
2284 /* We handle router advertisements ourselves, tell the kernel to GTFO */
2285 r = write_string_file(p, "0", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2286 if (r < 0)
2287 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2288
2289 return 0;
2290 }
2291
2292 static int link_set_ipv6_dad_transmits(Link *link) {
2293 char buf[DECIMAL_STR_MAX(int) + 1];
2294 const char *p = NULL;
2295 int r;
2296
2297 /* Make this a NOP if IPv6 is not available */
2298 if (!socket_ipv6_is_supported())
2299 return 0;
2300
2301 if (link->flags & IFF_LOOPBACK)
2302 return 0;
2303
2304 if (!link->network)
2305 return 0;
2306
2307 if (link->network->ipv6_dad_transmits < 0)
2308 return 0;
2309
2310 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/dad_transmits");
2311 xsprintf(buf, "%i", link->network->ipv6_dad_transmits);
2312
2313 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2314 if (r < 0)
2315 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2316
2317 return 0;
2318 }
2319
2320 static int link_set_ipv6_hop_limit(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_hop_limit < 0)
2336 return 0;
2337
2338 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/hop_limit");
2339 xsprintf(buf, "%i", link->network->ipv6_hop_limit);
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 hop limit for interface: %m");
2344
2345 return 0;
2346 }
2347
2348 static int link_drop_foreign_config(Link *link) {
2349 Address *address;
2350 Route *route;
2351 Iterator i;
2352 int r;
2353
2354 SET_FOREACH(address, link->addresses_foreign, i) {
2355 /* we consider IPv6LL addresses to be managed by the kernel */
2356 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2357 continue;
2358
2359 r = address_remove(address, link, link_address_remove_handler);
2360 if (r < 0)
2361 return r;
2362 }
2363
2364 SET_FOREACH(route, link->routes_foreign, i) {
2365 /* do not touch routes managed by the kernel */
2366 if (route->protocol == RTPROT_KERNEL)
2367 continue;
2368
2369 r = route_remove(route, link, link_route_remove_handler);
2370 if (r < 0)
2371 return r;
2372 }
2373
2374 return 0;
2375 }
2376
2377 static int link_drop_config(Link *link) {
2378 Address *address;
2379 Route *route;
2380 Iterator i;
2381 int r;
2382
2383 SET_FOREACH(address, link->addresses, i) {
2384 /* we consider IPv6LL addresses to be managed by the kernel */
2385 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2386 continue;
2387
2388 r = address_remove(address, link, link_address_remove_handler);
2389 if (r < 0)
2390 return r;
2391 }
2392
2393 SET_FOREACH(route, link->routes, i) {
2394 /* do not touch routes managed by the kernel */
2395 if (route->protocol == RTPROT_KERNEL)
2396 continue;
2397
2398 r = route_remove(route, link, link_route_remove_handler);
2399 if (r < 0)
2400 return r;
2401 }
2402
2403 return 0;
2404 }
2405
2406 static int link_update_lldp(Link *link) {
2407 int r;
2408
2409 assert(link);
2410
2411 if (!link->lldp)
2412 return 0;
2413
2414 if (link->flags & IFF_UP) {
2415 r = sd_lldp_start(link->lldp);
2416 if (r > 0)
2417 log_link_debug(link, "Started LLDP.");
2418 } else {
2419 r = sd_lldp_stop(link->lldp);
2420 if (r > 0)
2421 log_link_debug(link, "Stopped LLDP.");
2422 }
2423
2424 return r;
2425 }
2426
2427 static int link_configure(Link *link) {
2428 int r;
2429
2430 assert(link);
2431 assert(link->network);
2432 assert(link->state == LINK_STATE_PENDING);
2433
2434 /* Drop foreign config, but ignore loopback or critical devices.
2435 * We do not want to remove loopback address or addresses used for root NFS. */
2436 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2437 r = link_drop_foreign_config(link);
2438 if (r < 0)
2439 return r;
2440 }
2441
2442 r = link_set_bridge_fdb(link);
2443 if (r < 0)
2444 return r;
2445
2446 r = link_set_proxy_arp(link);
2447 if (r < 0)
2448 return r;
2449
2450 r = link_set_ipv4_forward(link);
2451 if (r < 0)
2452 return r;
2453
2454 r = link_set_ipv6_forward(link);
2455 if (r < 0)
2456 return r;
2457
2458 r = link_set_ipv6_privacy_extensions(link);
2459 if (r < 0)
2460 return r;
2461
2462 r = link_set_ipv6_accept_ra(link);
2463 if (r < 0)
2464 return r;
2465
2466 r = link_set_ipv6_dad_transmits(link);
2467 if (r < 0)
2468 return r;
2469
2470 r = link_set_ipv6_hop_limit(link);
2471 if (r < 0)
2472 return r;
2473
2474 r = link_set_flags(link);
2475 if (r < 0)
2476 return r;
2477
2478 if (link_ipv4ll_enabled(link)) {
2479 r = ipv4ll_configure(link);
2480 if (r < 0)
2481 return r;
2482 }
2483
2484 if (link_dhcp4_enabled(link)) {
2485 r = dhcp4_configure(link);
2486 if (r < 0)
2487 return r;
2488 }
2489
2490 if (link_dhcp4_server_enabled(link)) {
2491 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2492 if (r < 0)
2493 return r;
2494
2495 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2496 if (r < 0)
2497 return r;
2498 }
2499
2500 if (link_dhcp6_enabled(link) ||
2501 link_ipv6_accept_ra_enabled(link)) {
2502 r = dhcp6_configure(link);
2503 if (r < 0)
2504 return r;
2505 }
2506
2507 if (link_ipv6_accept_ra_enabled(link)) {
2508 r = ndisc_configure(link);
2509 if (r < 0)
2510 return r;
2511 }
2512
2513 if (link_lldp_rx_enabled(link)) {
2514 r = sd_lldp_new(&link->lldp);
2515 if (r < 0)
2516 return r;
2517
2518 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
2519 if (r < 0)
2520 return r;
2521
2522 r = sd_lldp_match_capabilities(link->lldp,
2523 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
2524 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
2525 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
2526 if (r < 0)
2527 return r;
2528
2529 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
2530 if (r < 0)
2531 return r;
2532
2533 r = sd_lldp_attach_event(link->lldp, NULL, 0);
2534 if (r < 0)
2535 return r;
2536
2537 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
2538 if (r < 0)
2539 return r;
2540
2541 r = link_update_lldp(link);
2542 if (r < 0)
2543 return r;
2544 }
2545
2546 if (link_has_carrier(link)) {
2547 r = link_acquire_conf(link);
2548 if (r < 0)
2549 return r;
2550 }
2551
2552 return link_enter_join_netdev(link);
2553 }
2554
2555 static int link_initialized_and_synced(sd_netlink *rtnl, sd_netlink_message *m,
2556 void *userdata) {
2557 _cleanup_link_unref_ Link *link = userdata;
2558 Network *network;
2559 int r;
2560
2561 assert(link);
2562 assert(link->ifname);
2563 assert(link->manager);
2564
2565 if (link->state != LINK_STATE_PENDING)
2566 return 1;
2567
2568 log_link_debug(link, "Link state is up-to-date");
2569
2570 r = link_new_bound_by_list(link);
2571 if (r < 0)
2572 return r;
2573
2574 r = link_handle_bound_by_list(link);
2575 if (r < 0)
2576 return r;
2577
2578 if (!link->network) {
2579 r = network_get(link->manager, link->udev_device, link->ifname,
2580 &link->mac, &network);
2581 if (r == -ENOENT) {
2582 link_enter_unmanaged(link);
2583 return 1;
2584 } else if (r < 0)
2585 return r;
2586
2587 if (link->flags & IFF_LOOPBACK) {
2588 if (network->link_local != ADDRESS_FAMILY_NO)
2589 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2590
2591 if (network->dhcp != ADDRESS_FAMILY_NO)
2592 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2593
2594 if (network->dhcp_server)
2595 log_link_debug(link, "Ignoring DHCP server for loopback link");
2596 }
2597
2598 r = network_apply(link->manager, network, link);
2599 if (r < 0)
2600 return r;
2601 }
2602
2603 r = link_new_bound_to_list(link);
2604 if (r < 0)
2605 return r;
2606
2607 r = link_configure(link);
2608 if (r < 0)
2609 return r;
2610
2611 return 1;
2612 }
2613
2614 int link_initialized(Link *link, struct udev_device *device) {
2615 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2616 int r;
2617
2618 assert(link);
2619 assert(link->manager);
2620 assert(link->manager->rtnl);
2621 assert(device);
2622
2623 if (link->state != LINK_STATE_PENDING)
2624 return 0;
2625
2626 if (link->udev_device)
2627 return 0;
2628
2629 log_link_debug(link, "udev initialized link");
2630
2631 link->udev_device = udev_device_ref(device);
2632
2633 /* udev has initialized the link, but we don't know if we have yet
2634 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2635 * when it returns we know that the pending NEWLINKs have already been
2636 * processed and that we are up-to-date */
2637
2638 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2639 link->ifindex);
2640 if (r < 0)
2641 return r;
2642
2643 r = sd_netlink_call_async(link->manager->rtnl, req,
2644 link_initialized_and_synced, link, 0, NULL);
2645 if (r < 0)
2646 return r;
2647
2648 link_ref(link);
2649
2650 return 0;
2651 }
2652
2653 static int link_load(Link *link) {
2654 _cleanup_free_ char *network_file = NULL,
2655 *addresses = NULL,
2656 *routes = NULL,
2657 *dhcp4_address = NULL,
2658 *ipv4ll_address = NULL;
2659 union in_addr_union address;
2660 union in_addr_union route_dst;
2661 const char *p;
2662 int r;
2663
2664 assert(link);
2665
2666 r = parse_env_file(link->state_file, NEWLINE,
2667 "NETWORK_FILE", &network_file,
2668 "ADDRESSES", &addresses,
2669 "ROUTES", &routes,
2670 "DHCP4_ADDRESS", &dhcp4_address,
2671 "IPV4LL_ADDRESS", &ipv4ll_address,
2672 NULL);
2673 if (r < 0 && r != -ENOENT)
2674 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
2675
2676 if (network_file) {
2677 Network *network;
2678 char *suffix;
2679
2680 /* drop suffix */
2681 suffix = strrchr(network_file, '.');
2682 if (!suffix) {
2683 log_link_debug(link, "Failed to get network name from %s", network_file);
2684 goto network_file_fail;
2685 }
2686 *suffix = '\0';
2687
2688 r = network_get_by_name(link->manager, basename(network_file), &network);
2689 if (r < 0) {
2690 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
2691 goto network_file_fail;
2692 }
2693
2694 r = network_apply(link->manager, network, link);
2695 if (r < 0)
2696 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
2697 }
2698
2699 network_file_fail:
2700
2701 if (addresses) {
2702 p = addresses;
2703
2704 for (;;) {
2705 _cleanup_free_ char *address_str = NULL;
2706 char *prefixlen_str;
2707 int family;
2708 unsigned char prefixlen;
2709
2710 r = extract_first_word(&p, &address_str, NULL, 0);
2711 if (r < 0) {
2712 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
2713 continue;
2714 }
2715 if (r == 0)
2716 break;
2717
2718 prefixlen_str = strchr(address_str, '/');
2719 if (!prefixlen_str) {
2720 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
2721 continue;
2722 }
2723
2724 *prefixlen_str++ = '\0';
2725
2726 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
2727 if (r != 1) {
2728 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
2729 continue;
2730 }
2731
2732 r = in_addr_from_string_auto(address_str, &family, &address);
2733 if (r < 0) {
2734 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
2735 continue;
2736 }
2737
2738 r = address_add(link, family, &address, prefixlen, NULL);
2739 if (r < 0)
2740 return log_link_error_errno(link, r, "Failed to add address: %m");
2741 }
2742 }
2743
2744 if (routes) {
2745 p = routes;
2746
2747 for (;;) {
2748 Route *route;
2749 _cleanup_free_ char *route_str = NULL;
2750 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
2751 usec_t lifetime;
2752 char *prefixlen_str;
2753 int family;
2754 unsigned char prefixlen, tos, table;
2755 uint32_t priority;
2756
2757 r = extract_first_word(&p, &route_str, NULL, 0);
2758 if (r < 0) {
2759 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
2760 continue;
2761 }
2762 if (r == 0)
2763 break;
2764
2765 prefixlen_str = strchr(route_str, '/');
2766 if (!prefixlen_str) {
2767 log_link_debug(link, "Failed to parse route %s", route_str);
2768 continue;
2769 }
2770
2771 *prefixlen_str++ = '\0';
2772
2773 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
2774 if (r != 5) {
2775 log_link_debug(link,
2776 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
2777 prefixlen_str);
2778 continue;
2779 }
2780
2781 r = in_addr_from_string_auto(route_str, &family, &route_dst);
2782 if (r < 0) {
2783 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
2784 continue;
2785 }
2786
2787 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
2788 if (r < 0)
2789 return log_link_error_errno(link, r, "Failed to add route: %m");
2790
2791 if (lifetime != USEC_INFINITY) {
2792 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
2793 0, route_expire_handler, route);
2794 if (r < 0)
2795 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
2796 }
2797
2798 route->lifetime = lifetime;
2799 sd_event_source_unref(route->expire);
2800 route->expire = expire;
2801 expire = NULL;
2802 }
2803 }
2804
2805 if (dhcp4_address) {
2806 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
2807 if (r < 0) {
2808 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
2809 goto dhcp4_address_fail;
2810 }
2811
2812 r = sd_dhcp_client_new(&link->dhcp_client);
2813 if (r < 0)
2814 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
2815
2816 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
2817 if (r < 0)
2818 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
2819 }
2820
2821 dhcp4_address_fail:
2822
2823 if (ipv4ll_address) {
2824 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
2825 if (r < 0) {
2826 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
2827 goto ipv4ll_address_fail;
2828 }
2829
2830 r = sd_ipv4ll_new(&link->ipv4ll);
2831 if (r < 0)
2832 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
2833
2834 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
2835 if (r < 0)
2836 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
2837 }
2838
2839 ipv4ll_address_fail:
2840
2841 return 0;
2842 }
2843
2844 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
2845 Link *link;
2846 _cleanup_udev_device_unref_ struct udev_device *device = NULL;
2847 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
2848 int r;
2849
2850 assert(m);
2851 assert(m->rtnl);
2852 assert(message);
2853 assert(ret);
2854
2855 r = link_new(m, message, ret);
2856 if (r < 0)
2857 return r;
2858
2859 link = *ret;
2860
2861 log_link_debug(link, "Link %d added", link->ifindex);
2862
2863 r = link_load(link);
2864 if (r < 0)
2865 return r;
2866
2867 if (detect_container() <= 0) {
2868 /* not in a container, udev will be around */
2869 sprintf(ifindex_str, "n%d", link->ifindex);
2870 device = udev_device_new_from_device_id(m->udev, ifindex_str);
2871 if (!device) {
2872 r = log_link_warning_errno(link, errno, "Could not find udev device: %m");
2873 goto failed;
2874 }
2875
2876 if (udev_device_get_is_initialized(device) <= 0) {
2877 /* not yet ready */
2878 log_link_debug(link, "link pending udev initialization...");
2879 return 0;
2880 }
2881
2882 r = link_initialized(link, device);
2883 if (r < 0)
2884 goto failed;
2885 } else {
2886 /* we are calling a callback directly, so must take a ref */
2887 link_ref(link);
2888
2889 r = link_initialized_and_synced(m->rtnl, NULL, link);
2890 if (r < 0)
2891 goto failed;
2892 }
2893
2894 return 0;
2895 failed:
2896 link_enter_failed(link);
2897 return r;
2898 }
2899
2900 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
2901 int r;
2902
2903 assert(link);
2904
2905 log_link_info(link, "Gained IPv6LL");
2906
2907 link->ipv6ll_address = *address;
2908 link_check_ready(link);
2909
2910 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
2911 r = link_acquire_ipv6_conf(link);
2912 if (r < 0) {
2913 link_enter_failed(link);
2914 return r;
2915 }
2916 }
2917
2918 return 0;
2919 }
2920
2921 static int link_carrier_gained(Link *link) {
2922 int r;
2923
2924 assert(link);
2925
2926 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
2927 r = link_acquire_conf(link);
2928 if (r < 0) {
2929 link_enter_failed(link);
2930 return r;
2931 }
2932
2933 r = link_enter_set_addresses(link);
2934 if (r < 0)
2935 return r;
2936 }
2937
2938 r = link_handle_bound_by_list(link);
2939 if (r < 0)
2940 return r;
2941
2942 return 0;
2943 }
2944
2945 static int link_carrier_lost(Link *link) {
2946 int r;
2947
2948 assert(link);
2949
2950 r = link_stop_clients(link);
2951 if (r < 0) {
2952 link_enter_failed(link);
2953 return r;
2954 }
2955
2956 r = link_drop_config(link);
2957 if (r < 0)
2958 return r;
2959
2960 if (link->state != LINK_STATE_UNMANAGED) {
2961 r = link_drop_foreign_config(link);
2962 if (r < 0)
2963 return r;
2964 }
2965
2966 r = link_handle_bound_by_list(link);
2967 if (r < 0)
2968 return r;
2969
2970 return 0;
2971 }
2972
2973 int link_carrier_reset(Link *link) {
2974 int r;
2975
2976 assert(link);
2977
2978 if (link_has_carrier(link)) {
2979 r = link_carrier_lost(link);
2980 if (r < 0)
2981 return r;
2982
2983 r = link_carrier_gained(link);
2984 if (r < 0)
2985 return r;
2986
2987 log_link_info(link, "Reset carrier");
2988 }
2989
2990 return 0;
2991 }
2992
2993 int link_update(Link *link, sd_netlink_message *m) {
2994 struct ether_addr mac;
2995 const char *ifname;
2996 uint32_t mtu;
2997 bool had_carrier, carrier_gained, carrier_lost;
2998 int r;
2999
3000 assert(link);
3001 assert(link->ifname);
3002 assert(m);
3003
3004 if (link->state == LINK_STATE_LINGER) {
3005 link_ref(link);
3006 log_link_info(link, "Link readded");
3007 link_set_state(link, LINK_STATE_ENSLAVING);
3008
3009 r = link_new_carrier_maps(link);
3010 if (r < 0)
3011 return r;
3012 }
3013
3014 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3015 if (r >= 0 && !streq(ifname, link->ifname)) {
3016 log_link_info(link, "Renamed to %s", ifname);
3017
3018 link_free_carrier_maps(link);
3019
3020 r = free_and_strdup(&link->ifname, ifname);
3021 if (r < 0)
3022 return r;
3023
3024 r = link_new_carrier_maps(link);
3025 if (r < 0)
3026 return r;
3027 }
3028
3029 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3030 if (r >= 0 && mtu > 0) {
3031 link->mtu = mtu;
3032 if (!link->original_mtu) {
3033 link->original_mtu = mtu;
3034 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3035 }
3036
3037 if (link->dhcp_client) {
3038 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3039 link->mtu);
3040 if (r < 0) {
3041 log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3042 return r;
3043 }
3044 }
3045 }
3046
3047 /* The kernel may broadcast NEWLINK messages without the MAC address
3048 set, simply ignore them. */
3049 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3050 if (r >= 0) {
3051 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3052 ETH_ALEN)) {
3053
3054 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3055 ETH_ALEN);
3056
3057 log_link_debug(link, "MAC address: "
3058 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3059 mac.ether_addr_octet[0],
3060 mac.ether_addr_octet[1],
3061 mac.ether_addr_octet[2],
3062 mac.ether_addr_octet[3],
3063 mac.ether_addr_octet[4],
3064 mac.ether_addr_octet[5]);
3065
3066 if (link->ipv4ll) {
3067 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3068 if (r < 0)
3069 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3070 }
3071
3072 if (link->dhcp_client) {
3073 const DUID *duid = link_duid(link);
3074
3075 r = sd_dhcp_client_set_mac(link->dhcp_client,
3076 (const uint8_t *) &link->mac,
3077 sizeof (link->mac),
3078 ARPHRD_ETHER);
3079 if (r < 0)
3080 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3081
3082 r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
3083 link->network->iaid,
3084 duid->type,
3085 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3086 duid->raw_data_len);
3087 if (r < 0)
3088 return log_link_warning_errno(link, r, "Could not update DUID/IAID in DHCP client: %m");
3089 }
3090
3091 if (link->dhcp6_client) {
3092 const DUID* duid = link_duid(link);
3093
3094 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3095 (const uint8_t *) &link->mac,
3096 sizeof (link->mac),
3097 ARPHRD_ETHER);
3098 if (r < 0)
3099 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3100
3101 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3102 link->network->iaid);
3103 if (r < 0)
3104 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3105
3106 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3107 duid->type,
3108 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3109 duid->raw_data_len);
3110 if (r < 0)
3111 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3112 }
3113 }
3114 }
3115
3116 had_carrier = link_has_carrier(link);
3117
3118 r = link_update_flags(link, m);
3119 if (r < 0)
3120 return r;
3121
3122 r = link_update_lldp(link);
3123 if (r < 0)
3124 return r;
3125
3126 carrier_gained = !had_carrier && link_has_carrier(link);
3127 carrier_lost = had_carrier && !link_has_carrier(link);
3128
3129 if (carrier_gained) {
3130 log_link_info(link, "Gained carrier");
3131
3132 r = link_carrier_gained(link);
3133 if (r < 0)
3134 return r;
3135 } else if (carrier_lost) {
3136 log_link_info(link, "Lost carrier");
3137
3138 r = link_carrier_lost(link);
3139 if (r < 0)
3140 return r;
3141 }
3142
3143 return 0;
3144 }
3145
3146 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3147 bool space = false;
3148 Iterator i;
3149 Link *link;
3150
3151 assert(f);
3152 assert(prefix);
3153
3154 if (hashmap_isempty(h))
3155 return;
3156
3157 fputs(prefix, f);
3158 HASHMAP_FOREACH(link, h, i) {
3159 if (space)
3160 fputc(' ', f);
3161
3162 fprintf(f, "%i", link->ifindex);
3163 space = true;
3164 }
3165
3166 fputc('\n', f);
3167 }
3168
3169 int link_save(Link *link) {
3170 _cleanup_free_ char *temp_path = NULL;
3171 _cleanup_fclose_ FILE *f = NULL;
3172 const char *admin_state, *oper_state;
3173 Address *a;
3174 Route *route;
3175 Iterator i;
3176 int r;
3177
3178 assert(link);
3179 assert(link->state_file);
3180 assert(link->lease_file);
3181 assert(link->manager);
3182
3183 if (link->state == LINK_STATE_LINGER) {
3184 unlink(link->state_file);
3185 return 0;
3186 }
3187
3188 link_lldp_save(link);
3189
3190 admin_state = link_state_to_string(link->state);
3191 assert(admin_state);
3192
3193 oper_state = link_operstate_to_string(link->operstate);
3194 assert(oper_state);
3195
3196 r = fopen_temporary(link->state_file, &f, &temp_path);
3197 if (r < 0)
3198 goto fail;
3199
3200 fchmod(fileno(f), 0644);
3201
3202 fprintf(f,
3203 "# This is private data. Do not parse.\n"
3204 "ADMIN_STATE=%s\n"
3205 "OPER_STATE=%s\n",
3206 admin_state, oper_state);
3207
3208 if (link->network) {
3209 bool space;
3210 sd_dhcp6_lease *dhcp6_lease = NULL;
3211 const char *dhcp_domainname = NULL;
3212 char **dhcp6_domains = NULL;
3213
3214 if (link->dhcp6_client) {
3215 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3216 if (r < 0 && r != -ENOMSG)
3217 log_link_debug(link, "No DHCPv6 lease");
3218 }
3219
3220 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3221
3222 fputs("DNS=", f);
3223 space = false;
3224 fputstrv(f, link->network->dns, NULL, &space);
3225
3226 if (link->network->dhcp_use_dns &&
3227 link->dhcp_lease) {
3228 const struct in_addr *addresses;
3229
3230 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3231 if (r > 0) {
3232 if (space)
3233 fputc(' ', f);
3234 serialize_in_addrs(f, addresses, r);
3235 space = true;
3236 }
3237 }
3238
3239 if (link->network->dhcp_use_dns && dhcp6_lease) {
3240 struct in6_addr *in6_addrs;
3241
3242 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3243 if (r > 0) {
3244 if (space)
3245 fputc(' ', f);
3246 serialize_in6_addrs(f, in6_addrs, r);
3247 space = true;
3248 }
3249 }
3250
3251 /* Make sure to flush out old entries before we use the NDISC data */
3252 ndisc_vacuum(link);
3253
3254 if (link->network->dhcp_use_dns && link->ndisc_rdnss) {
3255 NDiscRDNSS *dd;
3256
3257 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3258 if (space)
3259 fputc(' ', f);
3260
3261 serialize_in6_addrs(f, &dd->address, 1);
3262 space = true;
3263 }
3264 }
3265
3266 fputc('\n', f);
3267
3268 fputs("NTP=", f);
3269 space = false;
3270 fputstrv(f, link->network->ntp, NULL, &space);
3271
3272 if (link->network->dhcp_use_ntp &&
3273 link->dhcp_lease) {
3274 const struct in_addr *addresses;
3275
3276 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3277 if (r > 0) {
3278 if (space)
3279 fputc(' ', f);
3280 serialize_in_addrs(f, addresses, r);
3281 space = true;
3282 }
3283 }
3284
3285 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3286 struct in6_addr *in6_addrs;
3287 char **hosts;
3288
3289 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3290 &in6_addrs);
3291 if (r > 0) {
3292 if (space)
3293 fputc(' ', f);
3294 serialize_in6_addrs(f, in6_addrs, r);
3295 space = true;
3296 }
3297
3298 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3299 if (r > 0)
3300 fputstrv(f, hosts, NULL, &space);
3301 }
3302
3303 fputc('\n', f);
3304
3305 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3306 if (link->dhcp_lease)
3307 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3308 if (dhcp6_lease)
3309 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3310 }
3311
3312 fputs("DOMAINS=", f);
3313 fputstrv(f, link->network->search_domains, NULL, &space);
3314
3315 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3316 NDiscDNSSL *dd;
3317
3318 if (dhcp_domainname)
3319 fputs_with_space(f, dhcp_domainname, NULL, &space);
3320 if (dhcp6_domains)
3321 fputstrv(f, dhcp6_domains, NULL, &space);
3322
3323 SET_FOREACH(dd, link->ndisc_dnssl, i)
3324 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3325 }
3326
3327 fputc('\n', f);
3328
3329 fputs("ROUTE_DOMAINS=", f);
3330 fputstrv(f, link->network->route_domains, NULL, NULL);
3331
3332 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3333 NDiscDNSSL *dd;
3334
3335 if (dhcp_domainname)
3336 fputs_with_space(f, dhcp_domainname, NULL, &space);
3337 if (dhcp6_domains)
3338 fputstrv(f, dhcp6_domains, NULL, &space);
3339
3340 SET_FOREACH(dd, link->ndisc_dnssl, i)
3341 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3342 }
3343
3344 fputc('\n', f);
3345
3346 fprintf(f, "LLMNR=%s\n",
3347 resolve_support_to_string(link->network->llmnr));
3348 fprintf(f, "MDNS=%s\n",
3349 resolve_support_to_string(link->network->mdns));
3350
3351 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3352 fprintf(f, "DNSSEC=%s\n",
3353 dnssec_mode_to_string(link->network->dnssec_mode));
3354
3355 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3356 const char *n;
3357
3358 fputs("DNSSEC_NTA=", f);
3359 space = false;
3360 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3361 fputs_with_space(f, n, NULL, &space);
3362 fputc('\n', f);
3363 }
3364
3365 fputs("ADDRESSES=", f);
3366 space = false;
3367 SET_FOREACH(a, link->addresses, i) {
3368 _cleanup_free_ char *address_str = NULL;
3369
3370 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3371 if (r < 0)
3372 goto fail;
3373
3374 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3375 space = true;
3376 }
3377 fputc('\n', f);
3378
3379 fputs("ROUTES=", f);
3380 space = false;
3381 SET_FOREACH(route, link->routes, i) {
3382 _cleanup_free_ char *route_str = NULL;
3383
3384 r = in_addr_to_string(route->family, &route->dst, &route_str);
3385 if (r < 0)
3386 goto fail;
3387
3388 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%hhu/"USEC_FMT, space ? " " : "", route_str,
3389 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3390 space = true;
3391 }
3392
3393 fputc('\n', f);
3394 }
3395
3396 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3397 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3398
3399 if (link->dhcp_lease) {
3400 struct in_addr address;
3401 const char *tz = NULL;
3402
3403 assert(link->network);
3404
3405 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3406 if (r >= 0)
3407 fprintf(f, "TIMEZONE=%s\n", tz);
3408
3409 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3410 if (r >= 0) {
3411 fputs("DHCP4_ADDRESS=", f);
3412 serialize_in_addrs(f, &address, 1);
3413 fputc('\n', f);
3414 }
3415
3416 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3417 if (r < 0)
3418 goto fail;
3419
3420 fprintf(f,
3421 "DHCP_LEASE=%s\n",
3422 link->lease_file);
3423 } else
3424 unlink(link->lease_file);
3425
3426 if (link->ipv4ll) {
3427 struct in_addr address;
3428
3429 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3430 if (r >= 0) {
3431 fputs("IPV4LL_ADDRESS=", f);
3432 serialize_in_addrs(f, &address, 1);
3433 fputc('\n', f);
3434 }
3435 }
3436
3437 r = fflush_and_check(f);
3438 if (r < 0)
3439 goto fail;
3440
3441 if (rename(temp_path, link->state_file) < 0) {
3442 r = -errno;
3443 goto fail;
3444 }
3445
3446 return 0;
3447
3448 fail:
3449 (void) unlink(link->state_file);
3450 if (temp_path)
3451 (void) unlink(temp_path);
3452
3453 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3454 }
3455
3456 /* The serialized state in /run is no longer up-to-date. */
3457 void link_dirty(Link *link) {
3458 int r;
3459
3460 assert(link);
3461
3462 /* mark manager dirty as link is dirty */
3463 manager_dirty(link->manager);
3464
3465 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3466 if (r < 0)
3467 /* allocation errors are ignored */
3468 return;
3469
3470 r = set_put(link->manager->dirty_links, link);
3471 if (r <= 0)
3472 /* don't take another ref if the link was already dirty */
3473 return;
3474
3475 link_ref(link);
3476 }
3477
3478 /* The serialized state in /run is up-to-date */
3479 void link_clean(Link *link) {
3480 assert(link);
3481 assert(link->manager);
3482
3483 set_remove(link->manager->dirty_links, link);
3484 link_unref(link);
3485 }
3486
3487 static const char* const link_state_table[_LINK_STATE_MAX] = {
3488 [LINK_STATE_PENDING] = "pending",
3489 [LINK_STATE_ENSLAVING] = "configuring",
3490 [LINK_STATE_SETTING_ADDRESSES] = "configuring",
3491 [LINK_STATE_SETTING_ROUTES] = "configuring",
3492 [LINK_STATE_CONFIGURED] = "configured",
3493 [LINK_STATE_UNMANAGED] = "unmanaged",
3494 [LINK_STATE_FAILED] = "failed",
3495 [LINK_STATE_LINGER] = "linger",
3496 };
3497
3498 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
3499
3500 static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
3501 [LINK_OPERSTATE_OFF] = "off",
3502 [LINK_OPERSTATE_NO_CARRIER] = "no-carrier",
3503 [LINK_OPERSTATE_DORMANT] = "dormant",
3504 [LINK_OPERSTATE_CARRIER] = "carrier",
3505 [LINK_OPERSTATE_DEGRADED] = "degraded",
3506 [LINK_OPERSTATE_ROUTABLE] = "routable",
3507 };
3508
3509 DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
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