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macro: introduce DEFINE_TRIVIAL_REF_UNREF_FUNC() macro and friends
[thirdparty/systemd.git] / src / network / networkd-link.c
... / ...
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1/* SPDX-License-Identifier: LGPL-2.1+ */
2
3#include <netinet/ether.h>
4#include <linux/if.h>
5#include <linux/can/netlink.h>
6#include <unistd.h>
7#include <stdio_ext.h>
8
9#include "alloc-util.h"
10#include "bus-util.h"
11#include "dhcp-identifier.h"
12#include "dhcp-lease-internal.h"
13#include "fd-util.h"
14#include "fileio.h"
15#include "netlink-util.h"
16#include "network-internal.h"
17#include "networkd-ipv6-proxy-ndp.h"
18#include "networkd-lldp-tx.h"
19#include "networkd-manager.h"
20#include "networkd-ndisc.h"
21#include "networkd-radv.h"
22#include "networkd-routing-policy-rule.h"
23#include "set.h"
24#include "socket-util.h"
25#include "stdio-util.h"
26#include "string-table.h"
27#include "strv.h"
28#include "util.h"
29#include "virt.h"
30
31DUID* link_get_duid(Link *link) {
32 if (link->network->duid.type != _DUID_TYPE_INVALID)
33 return &link->network->duid;
34 else
35 return &link->manager->duid;
36}
37
38static bool link_dhcp6_enabled(Link *link) {
39 assert(link);
40
41 if (!socket_ipv6_is_supported())
42 return false;
43
44 if (link->flags & IFF_LOOPBACK)
45 return false;
46
47 if (!link->network)
48 return false;
49
50 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
51}
52
53static bool link_dhcp4_enabled(Link *link) {
54 assert(link);
55
56 if (link->flags & IFF_LOOPBACK)
57 return false;
58
59 if (!link->network)
60 return false;
61
62 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
63}
64
65static bool link_dhcp4_server_enabled(Link *link) {
66 assert(link);
67
68 if (link->flags & IFF_LOOPBACK)
69 return false;
70
71 if (!link->network)
72 return false;
73
74 return link->network->dhcp_server;
75}
76
77static bool link_ipv4ll_enabled(Link *link) {
78 assert(link);
79
80 if (link->flags & IFF_LOOPBACK)
81 return false;
82
83 if (!link->network)
84 return false;
85
86 if (streq_ptr(link->kind, "wireguard"))
87 return false;
88
89 return link->network->link_local & ADDRESS_FAMILY_IPV4;
90}
91
92static bool link_ipv6ll_enabled(Link *link) {
93 assert(link);
94
95 if (!socket_ipv6_is_supported())
96 return false;
97
98 if (link->flags & IFF_LOOPBACK)
99 return false;
100
101 if (!link->network)
102 return false;
103
104 if (streq_ptr(link->kind, "wireguard"))
105 return false;
106
107 return link->network->link_local & ADDRESS_FAMILY_IPV6;
108}
109
110static bool link_ipv6_enabled(Link *link) {
111 assert(link);
112
113 if (!socket_ipv6_is_supported())
114 return false;
115
116 if (link->network->bridge)
117 return false;
118
119 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
120 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
121}
122
123static bool link_radv_enabled(Link *link) {
124 assert(link);
125
126 if (!link_ipv6ll_enabled(link))
127 return false;
128
129 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
130}
131
132static bool link_lldp_rx_enabled(Link *link) {
133 assert(link);
134
135 if (link->flags & IFF_LOOPBACK)
136 return false;
137
138 if (link->iftype != ARPHRD_ETHER)
139 return false;
140
141 if (!link->network)
142 return false;
143
144 /* LLDP should be handled on bridge slaves as those have a direct
145 * connection to their peers not on the bridge master. Linux doesn't
146 * even (by default) forward lldp packets to the bridge master.*/
147 if (streq_ptr("bridge", link->kind))
148 return false;
149
150 return link->network->lldp_mode != LLDP_MODE_NO;
151}
152
153static bool link_lldp_emit_enabled(Link *link) {
154 assert(link);
155
156 if (link->flags & IFF_LOOPBACK)
157 return false;
158
159 if (link->iftype != ARPHRD_ETHER)
160 return false;
161
162 if (!link->network)
163 return false;
164
165 return link->network->lldp_emit != LLDP_EMIT_NO;
166}
167
168static bool link_ipv4_forward_enabled(Link *link) {
169 assert(link);
170
171 if (link->flags & IFF_LOOPBACK)
172 return false;
173
174 if (!link->network)
175 return false;
176
177 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
178 return false;
179
180 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
181}
182
183static bool link_ipv6_forward_enabled(Link *link) {
184 assert(link);
185
186 if (!socket_ipv6_is_supported())
187 return false;
188
189 if (link->flags & IFF_LOOPBACK)
190 return false;
191
192 if (!link->network)
193 return false;
194
195 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
196 return false;
197
198 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
199}
200
201static bool link_proxy_arp_enabled(Link *link) {
202 assert(link);
203
204 if (link->flags & IFF_LOOPBACK)
205 return false;
206
207 if (!link->network)
208 return false;
209
210 if (link->network->proxy_arp < 0)
211 return false;
212
213 return true;
214}
215
216static bool link_ipv6_accept_ra_enabled(Link *link) {
217 assert(link);
218
219 if (!socket_ipv6_is_supported())
220 return false;
221
222 if (link->flags & IFF_LOOPBACK)
223 return false;
224
225 if (!link->network)
226 return false;
227
228 if (!link_ipv6ll_enabled(link))
229 return false;
230
231 /* If unset use system default (enabled if local forwarding is disabled.
232 * disabled if local forwarding is enabled).
233 * If set, ignore or enforce RA independent of local forwarding state.
234 */
235 if (link->network->ipv6_accept_ra < 0)
236 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
237 return !link_ipv6_forward_enabled(link);
238 else if (link->network->ipv6_accept_ra > 0)
239 /* accept RA even if ip_forward is enabled */
240 return true;
241 else
242 /* ignore RA */
243 return false;
244}
245
246static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
247 assert(link);
248
249 if (!socket_ipv6_is_supported())
250 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
251
252 if (link->flags & IFF_LOOPBACK)
253 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
254
255 if (!link->network)
256 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
257
258 return link->network->ipv6_privacy_extensions;
259}
260
261static int link_enable_ipv6(Link *link) {
262 const char *p = NULL;
263 bool disabled;
264 int r;
265
266 if (link->flags & IFF_LOOPBACK)
267 return 0;
268
269 disabled = !link_ipv6_enabled(link);
270
271 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/disable_ipv6");
272
273 r = write_string_file(p, one_zero(disabled), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
274 if (r < 0)
275 log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m",
276 enable_disable(!disabled), link->ifname);
277 else
278 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
279
280 return 0;
281}
282
283void link_update_operstate(Link *link) {
284 LinkOperationalState operstate;
285 assert(link);
286
287 if (link->kernel_operstate == IF_OPER_DORMANT)
288 operstate = LINK_OPERSTATE_DORMANT;
289 else if (link_has_carrier(link)) {
290 Address *address;
291 uint8_t scope = RT_SCOPE_NOWHERE;
292 Iterator i;
293
294 /* if we have carrier, check what addresses we have */
295 SET_FOREACH(address, link->addresses, i) {
296 if (!address_is_ready(address))
297 continue;
298
299 if (address->scope < scope)
300 scope = address->scope;
301 }
302
303 /* for operstate we also take foreign addresses into account */
304 SET_FOREACH(address, link->addresses_foreign, i) {
305 if (!address_is_ready(address))
306 continue;
307
308 if (address->scope < scope)
309 scope = address->scope;
310 }
311
312 if (scope < RT_SCOPE_SITE)
313 /* universally accessible addresses found */
314 operstate = LINK_OPERSTATE_ROUTABLE;
315 else if (scope < RT_SCOPE_HOST)
316 /* only link or site local addresses found */
317 operstate = LINK_OPERSTATE_DEGRADED;
318 else
319 /* no useful addresses found */
320 operstate = LINK_OPERSTATE_CARRIER;
321 } else if (link->flags & IFF_UP)
322 operstate = LINK_OPERSTATE_NO_CARRIER;
323 else
324 operstate = LINK_OPERSTATE_OFF;
325
326 if (link->operstate != operstate) {
327 link->operstate = operstate;
328 link_send_changed(link, "OperationalState", NULL);
329 link_dirty(link);
330 }
331}
332
333#define FLAG_STRING(string, flag, old, new) \
334 (((old ^ new) & flag) \
335 ? ((old & flag) ? (" -" string) : (" +" string)) \
336 : "")
337
338static int link_update_flags(Link *link, sd_netlink_message *m) {
339 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
340 uint8_t operstate;
341 int r;
342
343 assert(link);
344
345 r = sd_rtnl_message_link_get_flags(m, &flags);
346 if (r < 0)
347 return log_link_warning_errno(link, r, "Could not get link flags: %m");
348
349 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
350 if (r < 0)
351 /* if we got a message without operstate, take it to mean
352 the state was unchanged */
353 operstate = link->kernel_operstate;
354
355 if ((link->flags == flags) && (link->kernel_operstate == operstate))
356 return 0;
357
358 if (link->flags != flags) {
359 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",
360 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
361 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
362 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
363 FLAG_STRING("UP", IFF_UP, link->flags, flags),
364 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
365 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
366 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
367 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
368 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
369 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
370 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
371 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
372 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
373 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
374 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
375 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
376 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
377 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
378 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
379
380 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
381 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
382 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
383 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
384 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
385 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
386 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
387 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
388
389 /* link flags are currently at most 18 bits, let's align to
390 * printing 20 */
391 if (unknown_flags_added)
392 log_link_debug(link,
393 "Unknown link flags gained: %#.5x (ignoring)",
394 unknown_flags_added);
395
396 if (unknown_flags_removed)
397 log_link_debug(link,
398 "Unknown link flags lost: %#.5x (ignoring)",
399 unknown_flags_removed);
400 }
401
402 link->flags = flags;
403 link->kernel_operstate = operstate;
404
405 link_update_operstate(link);
406
407 return 0;
408}
409
410static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
411 _cleanup_(link_unrefp) Link *link = NULL;
412 uint16_t type;
413 const char *ifname, *kind = NULL;
414 int r, ifindex;
415 unsigned short iftype;
416
417 assert(manager);
418 assert(message);
419 assert(ret);
420
421 /* check for link kind */
422 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
423 if (r == 0) {
424 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
425 r = sd_netlink_message_exit_container(message);
426 if (r < 0)
427 return r;
428 }
429
430 r = sd_netlink_message_get_type(message, &type);
431 if (r < 0)
432 return r;
433 else if (type != RTM_NEWLINK)
434 return -EINVAL;
435
436 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
437 if (r < 0)
438 return r;
439 else if (ifindex <= 0)
440 return -EINVAL;
441
442 r = sd_rtnl_message_link_get_type(message, &iftype);
443 if (r < 0)
444 return r;
445
446 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
447 if (r < 0)
448 return r;
449
450 link = new0(Link, 1);
451 if (!link)
452 return -ENOMEM;
453
454 link->n_ref = 1;
455 link->manager = manager;
456 link->state = LINK_STATE_PENDING;
457 link->rtnl_extended_attrs = true;
458 link->ifindex = ifindex;
459 link->iftype = iftype;
460 link->ifname = strdup(ifname);
461 if (!link->ifname)
462 return -ENOMEM;
463
464 if (kind) {
465 link->kind = strdup(kind);
466 if (!link->kind)
467 return -ENOMEM;
468 }
469
470 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
471 if (r < 0)
472 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
473
474 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
475 return -ENOMEM;
476
477 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
478 return -ENOMEM;
479
480 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
481 return -ENOMEM;
482
483 r = hashmap_ensure_allocated(&manager->links, NULL);
484 if (r < 0)
485 return r;
486
487 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
488 if (r < 0)
489 return r;
490
491 r = link_update_flags(link, message);
492 if (r < 0)
493 return r;
494
495 *ret = TAKE_PTR(link);
496
497 return 0;
498}
499
500static void link_free(Link *link) {
501 Address *address;
502 Link *carrier;
503 Route *route;
504 Iterator i;
505
506 if (!link)
507 return;
508
509 while ((route = set_first(link->routes)))
510 route_free(route);
511
512 while ((route = set_first(link->routes_foreign)))
513 route_free(route);
514
515 link->routes = set_free(link->routes);
516 link->routes_foreign = set_free(link->routes_foreign);
517
518 while ((address = set_first(link->addresses)))
519 address_free(address);
520
521 while ((address = set_first(link->addresses_foreign)))
522 address_free(address);
523
524 link->addresses = set_free(link->addresses);
525 link->addresses_foreign = set_free(link->addresses_foreign);
526
527 while ((address = link->pool_addresses)) {
528 LIST_REMOVE(addresses, link->pool_addresses, address);
529 address_free(address);
530 }
531
532 sd_dhcp_server_unref(link->dhcp_server);
533 sd_dhcp_client_unref(link->dhcp_client);
534 sd_dhcp_lease_unref(link->dhcp_lease);
535
536 link_lldp_emit_stop(link);
537
538 free(link->lease_file);
539
540 sd_lldp_unref(link->lldp);
541 free(link->lldp_file);
542
543 ndisc_flush(link);
544
545 sd_ipv4ll_unref(link->ipv4ll);
546 sd_dhcp6_client_unref(link->dhcp6_client);
547 sd_ndisc_unref(link->ndisc);
548 sd_radv_unref(link->radv);
549
550 if (link->manager) {
551 hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex));
552 set_remove(link->manager->links_requesting_uuid, link);
553 }
554
555 free(link->ifname);
556
557 free(link->kind);
558
559 (void) unlink(link->state_file);
560 free(link->state_file);
561
562 sd_device_unref(link->sd_device);
563
564 HASHMAP_FOREACH (carrier, link->bound_to_links, i)
565 hashmap_remove(link->bound_to_links, INT_TO_PTR(carrier->ifindex));
566 hashmap_free(link->bound_to_links);
567
568 HASHMAP_FOREACH (carrier, link->bound_by_links, i)
569 hashmap_remove(link->bound_by_links, INT_TO_PTR(carrier->ifindex));
570 hashmap_free(link->bound_by_links);
571
572 free(link);
573}
574
575Link *link_unref(Link *link) {
576 if (!link)
577 return NULL;
578
579 assert(link->n_ref > 0);
580
581 link->n_ref--;
582
583 if (link->n_ref > 0)
584 return NULL;
585
586 link_free(link);
587
588 return NULL;
589}
590
591Link *link_ref(Link *link) {
592 if (!link)
593 return NULL;
594
595 assert(link->n_ref > 0);
596
597 link->n_ref++;
598
599 return link;
600}
601
602int link_get(Manager *m, int ifindex, Link **ret) {
603 Link *link;
604
605 assert(m);
606 assert(ifindex);
607 assert(ret);
608
609 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
610 if (!link)
611 return -ENODEV;
612
613 *ret = link;
614
615 return 0;
616}
617
618static void link_set_state(Link *link, LinkState state) {
619 assert(link);
620
621 if (link->state == state)
622 return;
623
624 link->state = state;
625
626 link_send_changed(link, "AdministrativeState", NULL);
627}
628
629static void link_enter_unmanaged(Link *link) {
630 assert(link);
631
632 log_link_debug(link, "Unmanaged");
633
634 link_set_state(link, LINK_STATE_UNMANAGED);
635
636 link_dirty(link);
637}
638
639static int link_stop_clients(Link *link) {
640 int r = 0, k;
641
642 assert(link);
643 assert(link->manager);
644 assert(link->manager->event);
645
646 if (link->dhcp_client) {
647 k = sd_dhcp_client_stop(link->dhcp_client);
648 if (k < 0)
649 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
650 }
651
652 if (link->ipv4ll) {
653 k = sd_ipv4ll_stop(link->ipv4ll);
654 if (k < 0)
655 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
656 }
657
658 if (link->dhcp6_client) {
659 k = sd_dhcp6_client_stop(link->dhcp6_client);
660 if (k < 0)
661 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
662 }
663
664 if (link->ndisc) {
665 k = sd_ndisc_stop(link->ndisc);
666 if (k < 0)
667 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
668 }
669
670 if (link->radv) {
671 k = sd_radv_stop(link->radv);
672 if (k < 0)
673 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
674 }
675
676 link_lldp_emit_stop(link);
677 return r;
678}
679
680void link_enter_failed(Link *link) {
681 assert(link);
682
683 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
684 return;
685
686 log_link_warning(link, "Failed");
687
688 link_set_state(link, LINK_STATE_FAILED);
689
690 link_stop_clients(link);
691
692 link_dirty(link);
693}
694
695static Address* link_find_dhcp_server_address(Link *link) {
696 Address *address;
697
698 assert(link);
699 assert(link->network);
700
701 /* The first statically configured address if there is any */
702 LIST_FOREACH(addresses, address, link->network->static_addresses) {
703
704 if (address->family != AF_INET)
705 continue;
706
707 if (in_addr_is_null(address->family, &address->in_addr))
708 continue;
709
710 return address;
711 }
712
713 /* If that didn't work, find a suitable address we got from the pool */
714 LIST_FOREACH(addresses, address, link->pool_addresses) {
715 if (address->family != AF_INET)
716 continue;
717
718 return address;
719 }
720
721 return NULL;
722}
723
724static void link_enter_configured(Link *link) {
725 assert(link);
726 assert(link->network);
727
728 if (link->state != LINK_STATE_SETTING_ROUTES)
729 return;
730
731 log_link_info(link, "Configured");
732
733 link_set_state(link, LINK_STATE_CONFIGURED);
734
735 link_dirty(link);
736}
737
738void link_check_ready(Link *link) {
739 Address *a;
740 Iterator i;
741
742 assert(link);
743
744 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
745 return;
746
747 if (!link->network)
748 return;
749
750 if (!link->static_routes_configured)
751 return;
752
753 if (!link->routing_policy_rules_configured)
754 return;
755
756 if (link_ipv4ll_enabled(link))
757 if (!link->ipv4ll_address ||
758 !link->ipv4ll_route)
759 return;
760
761 if (!link->network->bridge) {
762
763 if (link_ipv6ll_enabled(link))
764 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) > 0)
765 return;
766
767 if ((link_dhcp4_enabled(link) && !link_dhcp6_enabled(link) &&
768 !link->dhcp4_configured) ||
769 (link_dhcp6_enabled(link) && !link_dhcp4_enabled(link) &&
770 !link->dhcp6_configured) ||
771 (link_dhcp4_enabled(link) && link_dhcp6_enabled(link) &&
772 !link->dhcp4_configured && !link->dhcp6_configured))
773 return;
774
775 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
776 return;
777 }
778
779 SET_FOREACH(a, link->addresses, i)
780 if (!address_is_ready(a))
781 return;
782
783 if (link->state != LINK_STATE_CONFIGURED)
784 link_enter_configured(link);
785
786 return;
787}
788
789static int link_set_routing_policy_rule(Link *link) {
790 RoutingPolicyRule *rule, *rrule = NULL;
791 int r;
792
793 assert(link);
794 assert(link->network);
795
796 LIST_FOREACH(rules, rule, link->network->rules) {
797 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
798 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif, &rrule);
799 if (r == 1) {
800 (void) routing_policy_rule_make_local(link->manager, rrule);
801 continue;
802 }
803
804 r = routing_policy_rule_configure(rule, link, link_routing_policy_rule_handler, false);
805 if (r < 0) {
806 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
807 link_enter_failed(link);
808 return r;
809 }
810
811 link->routing_policy_rule_messages++;
812 }
813
814 routing_policy_rule_purge(link->manager, link);
815 if (link->routing_policy_rule_messages == 0) {
816 link->routing_policy_rules_configured = true;
817 link_check_ready(link);
818 } else
819 log_link_debug(link, "Setting routing policy rules");
820
821 return 0;
822}
823
824static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
825 _cleanup_(link_unrefp) Link *link = userdata;
826 int r;
827
828 assert(link->route_messages > 0);
829 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
830 LINK_STATE_SETTING_ROUTES, LINK_STATE_FAILED,
831 LINK_STATE_LINGER));
832
833 link->route_messages--;
834
835 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
836 return 1;
837
838 r = sd_netlink_message_get_errno(m);
839 if (r < 0 && r != -EEXIST)
840 log_link_warning_errno(link, r, "Could not set route: %m");
841
842 if (link->route_messages == 0) {
843 log_link_debug(link, "Routes set");
844 link->static_routes_configured = true;
845 link_check_ready(link);
846 }
847
848 return 1;
849}
850
851static int link_enter_set_routes(Link *link) {
852 Route *rt;
853 int r;
854
855 assert(link);
856 assert(link->network);
857 assert(link->state == LINK_STATE_SETTING_ADDRESSES);
858
859 (void) link_set_routing_policy_rule(link);
860
861 link_set_state(link, LINK_STATE_SETTING_ROUTES);
862
863 LIST_FOREACH(routes, rt, link->network->static_routes) {
864 r = route_configure(rt, link, route_handler);
865 if (r < 0) {
866 log_link_warning_errno(link, r, "Could not set routes: %m");
867 link_enter_failed(link);
868 return r;
869 }
870
871 link->route_messages++;
872 }
873
874 if (link->route_messages == 0) {
875 link->static_routes_configured = true;
876 link_check_ready(link);
877 } else
878 log_link_debug(link, "Setting routes");
879
880 return 0;
881}
882
883int link_route_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
884 _cleanup_(link_unrefp) Link *link = userdata;
885 int r;
886
887 assert(m);
888 assert(link);
889 assert(link->ifname);
890
891 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
892 return 1;
893
894 r = sd_netlink_message_get_errno(m);
895 if (r < 0 && r != -ESRCH)
896 log_link_warning_errno(link, r, "Could not drop route: %m");
897
898 return 1;
899}
900
901static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
902 _cleanup_(link_unrefp) Link *link = userdata;
903 int r;
904
905 assert(rtnl);
906 assert(m);
907 assert(link);
908 assert(link->ifname);
909 assert(link->address_messages > 0);
910 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
911 LINK_STATE_FAILED, LINK_STATE_LINGER));
912
913 link->address_messages--;
914
915 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
916 return 1;
917
918 r = sd_netlink_message_get_errno(m);
919 if (r < 0 && r != -EEXIST)
920 log_link_warning_errno(link, r, "could not set address: %m");
921 else if (r >= 0)
922 manager_rtnl_process_address(rtnl, m, link->manager);
923
924 if (link->address_messages == 0) {
925 log_link_debug(link, "Addresses set");
926 link_enter_set_routes(link);
927 }
928
929 return 1;
930}
931
932static int address_label_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
933 _cleanup_(link_unrefp) Link *link = userdata;
934 int r;
935
936 assert(rtnl);
937 assert(m);
938 assert(link);
939 assert(link->ifname);
940 assert(link->address_label_messages > 0);
941
942 link->address_label_messages--;
943
944 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
945 return 1;
946
947 r = sd_netlink_message_get_errno(m);
948 if (r < 0 && r != -EEXIST)
949 log_link_warning_errno(link, r, "could not set address label: %m");
950 else if (r >= 0)
951 manager_rtnl_process_address(rtnl, m, link->manager);
952
953 if (link->address_label_messages == 0)
954 log_link_debug(link, "Addresses label set");
955
956 return 1;
957}
958
959static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
960 _cleanup_free_ struct in_addr *addresses = NULL;
961 size_t n_addresses = 0, n_allocated = 0;
962 unsigned i;
963
964 log_debug("Copying DNS server information from %s", link->ifname);
965
966 if (!link->network)
967 return 0;
968
969 for (i = 0; i < link->network->n_dns; i++) {
970 struct in_addr ia;
971
972 /* Only look for IPv4 addresses */
973 if (link->network->dns[i].family != AF_INET)
974 continue;
975
976 ia = link->network->dns[i].address.in;
977
978 /* Never propagate obviously borked data */
979 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
980 continue;
981
982 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
983 return log_oom();
984
985 addresses[n_addresses++] = ia;
986 }
987
988 if (link->network->dhcp_use_dns && link->dhcp_lease) {
989 const struct in_addr *da = NULL;
990 int n;
991
992 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
993 if (n > 0) {
994
995 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
996 return log_oom();
997
998 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
999 n_addresses += n;
1000 }
1001 }
1002
1003 if (n_addresses <= 0)
1004 return 0;
1005
1006 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
1007}
1008
1009static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1010 _cleanup_free_ struct in_addr *addresses = NULL;
1011 size_t n_addresses = 0, n_allocated = 0;
1012 char **a;
1013
1014 if (!link->network)
1015 return 0;
1016
1017 log_debug("Copying NTP server information from %s", link->ifname);
1018
1019 STRV_FOREACH(a, link->network->ntp) {
1020 struct in_addr ia;
1021
1022 /* Only look for IPv4 addresses */
1023 if (inet_pton(AF_INET, *a, &ia) <= 0)
1024 continue;
1025
1026 /* Never propagate obviously borked data */
1027 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1028 continue;
1029
1030 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1031 return log_oom();
1032
1033 addresses[n_addresses++] = ia;
1034 }
1035
1036 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1037 const struct in_addr *da = NULL;
1038 int n;
1039
1040 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1041 if (n > 0) {
1042
1043 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1044 return log_oom();
1045
1046 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
1047 n_addresses += n;
1048 }
1049 }
1050
1051 if (n_addresses <= 0)
1052 return 0;
1053
1054 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1055}
1056
1057static int link_set_bridge_fdb(Link *link) {
1058 FdbEntry *fdb_entry;
1059 int r;
1060
1061 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1062 r = fdb_entry_configure(link, fdb_entry);
1063 if (r < 0)
1064 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1065 }
1066
1067 return 0;
1068}
1069
1070static int link_enter_set_addresses(Link *link) {
1071 AddressLabel *label;
1072 Address *ad;
1073 int r;
1074
1075 assert(link);
1076 assert(link->network);
1077 assert(link->state != _LINK_STATE_INVALID);
1078
1079 r = link_set_bridge_fdb(link);
1080 if (r < 0)
1081 return r;
1082
1083 link_set_state(link, LINK_STATE_SETTING_ADDRESSES);
1084
1085 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1086 r = address_configure(ad, link, address_handler, false);
1087 if (r < 0) {
1088 log_link_warning_errno(link, r, "Could not set addresses: %m");
1089 link_enter_failed(link);
1090 return r;
1091 }
1092
1093 link->address_messages++;
1094 }
1095
1096 LIST_FOREACH(labels, label, link->network->address_labels) {
1097 r = address_label_configure(label, link, address_label_handler, false);
1098 if (r < 0) {
1099 log_link_warning_errno(link, r, "Could not set address label: %m");
1100 link_enter_failed(link);
1101 return r;
1102 }
1103
1104 link->address_label_messages++;
1105 }
1106
1107 /* now that we can figure out a default address for the dhcp server,
1108 start it */
1109 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1110 Address *address;
1111 Link *uplink = NULL;
1112 bool acquired_uplink = false;
1113
1114 address = link_find_dhcp_server_address(link);
1115 if (!address) {
1116 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1117 link_enter_failed(link);
1118 return 0;
1119 }
1120
1121 /* use the server address' subnet as the pool */
1122 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1123 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1124 if (r < 0)
1125 return r;
1126
1127 /* TODO:
1128 r = sd_dhcp_server_set_router(link->dhcp_server,
1129 &main_address->in_addr.in);
1130 if (r < 0)
1131 return r;
1132 */
1133
1134 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1135 r = sd_dhcp_server_set_max_lease_time(
1136 link->dhcp_server,
1137 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1138 if (r < 0)
1139 return r;
1140 }
1141
1142 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1143 r = sd_dhcp_server_set_default_lease_time(
1144 link->dhcp_server,
1145 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1146 if (r < 0)
1147 return r;
1148 }
1149
1150 if (link->network->dhcp_server_emit_dns) {
1151
1152 if (link->network->n_dhcp_server_dns > 0)
1153 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1154 else {
1155 uplink = manager_find_uplink(link->manager, link);
1156 acquired_uplink = true;
1157
1158 if (!uplink) {
1159 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1160 r = 0;
1161 } else
1162 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1163 }
1164 if (r < 0)
1165 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1166 }
1167
1168 if (link->network->dhcp_server_emit_ntp) {
1169
1170 if (link->network->n_dhcp_server_ntp > 0)
1171 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1172 else {
1173 if (!acquired_uplink)
1174 uplink = manager_find_uplink(link->manager, link);
1175
1176 if (!uplink) {
1177 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1178 r = 0;
1179 } else
1180 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1181
1182 }
1183 if (r < 0)
1184 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1185 }
1186
1187 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1188 if (r < 0)
1189 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1190
1191 if (link->network->dhcp_server_emit_timezone) {
1192 _cleanup_free_ char *buffer = NULL;
1193 const char *tz = NULL;
1194
1195 if (link->network->dhcp_server_timezone)
1196 tz = link->network->dhcp_server_timezone;
1197 else {
1198 r = get_timezone(&buffer);
1199 if (r < 0)
1200 log_warning_errno(r, "Failed to determine timezone: %m");
1201 else
1202 tz = buffer;
1203 }
1204
1205 if (tz) {
1206 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1207 if (r < 0)
1208 return r;
1209 }
1210 }
1211
1212 r = sd_dhcp_server_start(link->dhcp_server);
1213 if (r < 0) {
1214 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1215
1216 link_enter_failed(link);
1217
1218 return 0;
1219 }
1220
1221 log_link_debug(link, "Offering DHCPv4 leases");
1222 }
1223
1224 if (link->address_messages == 0)
1225 link_enter_set_routes(link);
1226 else
1227 log_link_debug(link, "Setting addresses");
1228
1229 return 0;
1230}
1231
1232int link_address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1233 _cleanup_(link_unrefp) Link *link = userdata;
1234 int r;
1235
1236 assert(m);
1237 assert(link);
1238 assert(link->ifname);
1239
1240 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1241 return 1;
1242
1243 r = sd_netlink_message_get_errno(m);
1244 if (r < 0 && r != -EADDRNOTAVAIL)
1245 log_link_warning_errno(link, r, "Could not drop address: %m");
1246
1247 return 1;
1248}
1249
1250static int link_set_bridge_vlan(Link *link) {
1251 int r = 0;
1252
1253 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1254 if (r < 0)
1255 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1256
1257 return r;
1258}
1259
1260static int link_set_proxy_arp(Link *link) {
1261 const char *p = NULL;
1262 int r;
1263
1264 if (!link_proxy_arp_enabled(link))
1265 return 0;
1266
1267 p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/proxy_arp");
1268
1269 r = write_string_file(p, one_zero(link->network->proxy_arp), WRITE_STRING_FILE_VERIFY_ON_FAILURE);
1270 if (r < 0)
1271 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1272
1273 return 0;
1274}
1275
1276static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1277 _cleanup_(link_unrefp) Link *link = userdata;
1278 int r;
1279
1280 log_link_debug(link, "Set link");
1281
1282 r = sd_netlink_message_get_errno(m);
1283 if (r < 0 && r != -EEXIST) {
1284 log_link_error_errno(link, r, "Could not join netdev: %m");
1285 link_enter_failed(link);
1286 return 1;
1287 }
1288
1289 return 0;
1290}
1291
1292static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1293 _cleanup_(link_unrefp) Link *link = userdata;
1294 int r;
1295
1296 assert(m);
1297 assert(link);
1298 assert(link->ifname);
1299
1300 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1301 return 1;
1302
1303 r = sd_netlink_message_get_errno(m);
1304 if (r < 0)
1305 log_link_warning_errno(link, r, "Could not set MTU: %m");
1306
1307 return 1;
1308}
1309
1310int link_set_mtu(Link *link, uint32_t mtu) {
1311 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1312 int r;
1313
1314 assert(link);
1315 assert(link->manager);
1316 assert(link->manager->rtnl);
1317
1318 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1319
1320 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1321 if (r < 0)
1322 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1323
1324 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1325 for this interface, or if it is a bridge slave, then disable IPv6 else enable it. */
1326 (void) link_enable_ipv6(link);
1327
1328 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1329 on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1330 if (link_ipv6_enabled(link) && link->network->mtu < IPV6_MIN_MTU) {
1331
1332 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1333 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1334
1335 link->network->mtu = IPV6_MIN_MTU;
1336 }
1337
1338 r = sd_netlink_message_append_u32(req, IFLA_MTU, link->network->mtu);
1339 if (r < 0)
1340 return log_link_error_errno(link, r, "Could not set MTU: %m");
1341
1342 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1343 if (r < 0)
1344 return log_link_error_errno(link, r, "Could not append MTU: %m");
1345
1346 r = sd_netlink_call_async(link->manager->rtnl, req, set_mtu_handler, link, 0, NULL);
1347 if (r < 0)
1348 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1349
1350 link->setting_mtu = true;
1351
1352 link_ref(link);
1353
1354 return 0;
1355}
1356
1357static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1358 _cleanup_(link_unrefp) Link *link = userdata;
1359 int r;
1360
1361 assert(m);
1362 assert(link);
1363 assert(link->ifname);
1364
1365 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1366 return 1;
1367
1368 r = sd_netlink_message_get_errno(m);
1369 if (r < 0)
1370 log_link_warning_errno(link, r, "Could not set link flags: %m");
1371
1372 return 1;
1373}
1374
1375static int link_set_flags(Link *link) {
1376 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1377 unsigned ifi_change = 0;
1378 unsigned ifi_flags = 0;
1379 int r;
1380
1381 assert(link);
1382 assert(link->manager);
1383 assert(link->manager->rtnl);
1384
1385 if (link->flags & IFF_LOOPBACK)
1386 return 0;
1387
1388 if (!link->network)
1389 return 0;
1390
1391 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1392 return 0;
1393
1394 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1395 if (r < 0)
1396 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1397
1398 if (link->network->arp >= 0) {
1399 ifi_change |= IFF_NOARP;
1400 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1401 }
1402
1403 if (link->network->multicast >= 0) {
1404 ifi_change |= IFF_MULTICAST;
1405 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1406 }
1407
1408 if (link->network->allmulticast >= 0) {
1409 ifi_change |= IFF_ALLMULTI;
1410 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1411 }
1412
1413 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1414 if (r < 0)
1415 return log_link_error_errno(link, r, "Could not set link flags: %m");
1416
1417 r = sd_netlink_call_async(link->manager->rtnl, req, set_flags_handler, link, 0, NULL);
1418 if (r < 0)
1419 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1420
1421 link_ref(link);
1422
1423 return 0;
1424}
1425
1426static int link_set_bridge(Link *link) {
1427 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1428 int r;
1429
1430 assert(link);
1431 assert(link->network);
1432
1433 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1434 if (r < 0)
1435 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1436
1437 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1438 if (r < 0)
1439 return log_link_error_errno(link, r, "Could not set message family: %m");
1440
1441 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1442 if (r < 0)
1443 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1444
1445 if (link->network->use_bpdu >= 0) {
1446 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
1447 if (r < 0)
1448 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1449 }
1450
1451 if (link->network->hairpin >= 0) {
1452 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1453 if (r < 0)
1454 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1455 }
1456
1457 if (link->network->fast_leave >= 0) {
1458 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1459 if (r < 0)
1460 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1461 }
1462
1463 if (link->network->allow_port_to_be_root >= 0) {
1464 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
1465 if (r < 0)
1466 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1467
1468 }
1469
1470 if (link->network->unicast_flood >= 0) {
1471 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1472 if (r < 0)
1473 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1474
1475 }
1476
1477 if (link->network->cost != 0) {
1478 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1479 if (r < 0)
1480 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1481 }
1482 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1483 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1484 if (r < 0)
1485 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1486 }
1487
1488 r = sd_netlink_message_close_container(req);
1489 if (r < 0)
1490 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1491
1492 r = sd_netlink_call_async(link->manager->rtnl, req, link_set_handler, link, 0, NULL);
1493 if (r < 0)
1494 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1495
1496 link_ref(link);
1497
1498 return r;
1499}
1500
1501static int link_bond_set(Link *link) {
1502 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1503 int r;
1504
1505 assert(link);
1506 assert(link->network);
1507
1508 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1509 if (r < 0)
1510 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1511
1512 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1513 if (r < 0)
1514 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1515
1516 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1517 if (r < 0)
1518 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1519
1520 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1521 if (r < 0)
1522 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1523
1524 if (link->network->active_slave) {
1525 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1526 if (r < 0)
1527 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1528 }
1529
1530 if (link->network->primary_slave) {
1531 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1532 if (r < 0)
1533 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1534 }
1535
1536 r = sd_netlink_message_close_container(req);
1537 if (r < 0)
1538 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1539
1540 r = sd_netlink_message_close_container(req);
1541 if (r < 0)
1542 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1543
1544 r = sd_netlink_call_async(link->manager->rtnl, req, set_flags_handler, link, 0, NULL);
1545 if (r < 0)
1546 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1547
1548 link_ref(link);
1549
1550 return r;
1551}
1552
1553static int link_lldp_save(Link *link) {
1554 _cleanup_free_ char *temp_path = NULL;
1555 _cleanup_fclose_ FILE *f = NULL;
1556 sd_lldp_neighbor **l = NULL;
1557 int n = 0, r, i;
1558
1559 assert(link);
1560 assert(link->lldp_file);
1561
1562 if (!link->lldp) {
1563 (void) unlink(link->lldp_file);
1564 return 0;
1565 }
1566
1567 r = sd_lldp_get_neighbors(link->lldp, &l);
1568 if (r < 0)
1569 goto finish;
1570 if (r == 0) {
1571 (void) unlink(link->lldp_file);
1572 goto finish;
1573 }
1574
1575 n = r;
1576
1577 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1578 if (r < 0)
1579 goto finish;
1580
1581 fchmod(fileno(f), 0644);
1582
1583 for (i = 0; i < n; i++) {
1584 const void *p;
1585 le64_t u;
1586 size_t sz;
1587
1588 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1589 if (r < 0)
1590 goto finish;
1591
1592 u = htole64(sz);
1593 (void) fwrite(&u, 1, sizeof(u), f);
1594 (void) fwrite(p, 1, sz, f);
1595 }
1596
1597 r = fflush_and_check(f);
1598 if (r < 0)
1599 goto finish;
1600
1601 if (rename(temp_path, link->lldp_file) < 0) {
1602 r = -errno;
1603 goto finish;
1604 }
1605
1606finish:
1607 if (r < 0) {
1608 (void) unlink(link->lldp_file);
1609 if (temp_path)
1610 (void) unlink(temp_path);
1611
1612 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1613 }
1614
1615 if (l) {
1616 for (i = 0; i < n; i++)
1617 sd_lldp_neighbor_unref(l[i]);
1618 free(l);
1619 }
1620
1621 return r;
1622}
1623
1624static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1625 Link *link = userdata;
1626 int r;
1627
1628 assert(link);
1629
1630 (void) link_lldp_save(link);
1631
1632 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1633 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1634
1635 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1636
1637 r = link_lldp_emit_start(link);
1638 if (r < 0)
1639 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1640 }
1641}
1642
1643static int link_acquire_ipv6_conf(Link *link) {
1644 int r;
1645
1646 assert(link);
1647
1648 if (link_dhcp6_enabled(link)) {
1649 assert(link->dhcp6_client);
1650 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1651
1652 /* start DHCPv6 client in stateless mode */
1653 r = dhcp6_request_address(link, true);
1654 if (r < 0 && r != -EBUSY)
1655 return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m");
1656 else
1657 log_link_debug(link, "Acquiring DHCPv6 lease");
1658 }
1659
1660 if (link_ipv6_accept_ra_enabled(link)) {
1661 assert(link->ndisc);
1662
1663 log_link_debug(link, "Discovering IPv6 routers");
1664
1665 r = sd_ndisc_start(link->ndisc);
1666 if (r < 0 && r != -EBUSY)
1667 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1668 }
1669
1670 if (link_radv_enabled(link)) {
1671 assert(link->radv);
1672 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1673
1674 log_link_debug(link, "Starting IPv6 Router Advertisements");
1675
1676 r = sd_radv_start(link->radv);
1677 if (r < 0 && r != -EBUSY)
1678 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1679 }
1680
1681 return 0;
1682}
1683
1684static int link_acquire_ipv4_conf(Link *link) {
1685 int r;
1686
1687 assert(link);
1688 assert(link->network);
1689 assert(link->manager);
1690 assert(link->manager->event);
1691
1692 if (link_ipv4ll_enabled(link)) {
1693 assert(link->ipv4ll);
1694
1695 log_link_debug(link, "Acquiring IPv4 link-local address");
1696
1697 r = sd_ipv4ll_start(link->ipv4ll);
1698 if (r < 0)
1699 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1700 }
1701
1702 if (link_dhcp4_enabled(link)) {
1703 assert(link->dhcp_client);
1704
1705 log_link_debug(link, "Acquiring DHCPv4 lease");
1706
1707 r = sd_dhcp_client_start(link->dhcp_client);
1708 if (r < 0)
1709 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1710 }
1711
1712 return 0;
1713}
1714
1715static int link_acquire_conf(Link *link) {
1716 int r;
1717
1718 assert(link);
1719
1720 if (link->setting_mtu) {
1721 link->setting_mtu = false;
1722 return 0;
1723 }
1724
1725 r = link_acquire_ipv4_conf(link);
1726 if (r < 0)
1727 return r;
1728
1729 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) == 0) {
1730 r = link_acquire_ipv6_conf(link);
1731 if (r < 0)
1732 return r;
1733 }
1734
1735 if (link_lldp_emit_enabled(link)) {
1736 r = link_lldp_emit_start(link);
1737 if (r < 0)
1738 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1739 }
1740
1741 return 0;
1742}
1743
1744bool link_has_carrier(Link *link) {
1745 /* see Documentation/networking/operstates.txt in the kernel sources */
1746
1747 if (link->kernel_operstate == IF_OPER_UP)
1748 return true;
1749
1750 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1751 /* operstate may not be implemented, so fall back to flags */
1752 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1753 return true;
1754
1755 return false;
1756}
1757
1758static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1759 _cleanup_(link_unrefp) Link *link = userdata;
1760 int r;
1761
1762 assert(link);
1763
1764 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1765 return 1;
1766
1767 r = sd_netlink_message_get_errno(m);
1768 if (r < 0)
1769 /* we warn but don't fail the link, as it may be
1770 brought up later */
1771 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1772
1773 return 1;
1774}
1775
1776int link_up(Link *link) {
1777 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1778 uint8_t ipv6ll_mode;
1779 int r;
1780
1781 assert(link);
1782 assert(link->network);
1783 assert(link->manager);
1784 assert(link->manager->rtnl);
1785
1786 log_link_debug(link, "Bringing link up");
1787
1788 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1789 if (r < 0)
1790 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1791
1792 /* set it free if not enslaved with networkd */
1793 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1794 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1795 if (r < 0)
1796 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1797 }
1798
1799 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1800 if (r < 0)
1801 return log_link_error_errno(link, r, "Could not set link flags: %m");
1802
1803 if (link->network->mac) {
1804 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1805 if (r < 0)
1806 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1807 }
1808
1809 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1810 if (r < 0)
1811 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1812
1813 if (link_ipv6_enabled(link)) {
1814 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
1815 r = sd_netlink_message_open_container(req, AF_INET6);
1816 if (r < 0)
1817 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1818
1819 if (!link_ipv6ll_enabled(link))
1820 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1821 else {
1822 const char *p = NULL;
1823 _cleanup_free_ char *stable_secret = NULL;
1824
1825 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/stable_secret");
1826 r = read_one_line_file(p, &stable_secret);
1827
1828 if (r < 0)
1829 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1830 else
1831 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1832 }
1833 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1834 if (r < 0)
1835 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1836
1837 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
1838 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
1839 if (r < 0)
1840 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
1841 }
1842
1843 r = sd_netlink_message_close_container(req);
1844 if (r < 0)
1845 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1846 }
1847
1848 r = sd_netlink_message_close_container(req);
1849 if (r < 0)
1850 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1851
1852 r = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
1853 if (r < 0)
1854 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1855
1856 link_ref(link);
1857
1858 return 0;
1859}
1860
1861static int link_up_can(Link *link) {
1862 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1863 int r;
1864
1865 assert(link);
1866
1867 log_link_debug(link, "Bringing CAN link up");
1868
1869 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1870 if (r < 0)
1871 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1872
1873 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1874 if (r < 0)
1875 return log_link_error_errno(link, r, "Could not set link flags: %m");
1876
1877 r = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
1878 if (r < 0)
1879 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1880
1881 link_ref(link);
1882
1883 return 0;
1884}
1885
1886static int link_set_can(Link *link) {
1887 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
1888 int r;
1889
1890 assert(link);
1891 assert(link->network);
1892 assert(link->manager);
1893 assert(link->manager->rtnl);
1894
1895 log_link_debug(link, "link_set_can");
1896
1897 r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
1898 if (r < 0)
1899 return log_link_error_errno(link, r, "Failed to allocate netlink message: %m");
1900
1901 r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
1902 if (r < 0)
1903 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1904
1905 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
1906 if (r < 0)
1907 return log_link_error_errno(link, r, "Failed to open netlink container: %m");
1908
1909 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
1910 if (r < 0)
1911 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1912
1913 if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) {
1914 struct can_bittiming bt = {
1915 .bitrate = link->network->can_bitrate,
1916 .sample_point = link->network->can_sample_point,
1917 };
1918
1919 if (link->network->can_bitrate > UINT32_MAX) {
1920 log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate);
1921 return -ERANGE;
1922 }
1923
1924 log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate);
1925 if (link->network->can_sample_point > 0)
1926 log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
1927 else
1928 log_link_debug(link, "Using default sample point");
1929
1930 r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
1931 if (r < 0)
1932 return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
1933 }
1934
1935 if (link->network->can_restart_us > 0) {
1936 char time_string[FORMAT_TIMESPAN_MAX];
1937 uint64_t restart_ms;
1938
1939 if (link->network->can_restart_us == USEC_INFINITY)
1940 restart_ms = 0;
1941 else
1942 restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC);
1943
1944 format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC);
1945
1946 if (restart_ms > UINT32_MAX) {
1947 log_link_error(link, "restart timeout (%s) too big.", time_string);
1948 return -ERANGE;
1949 }
1950
1951 log_link_debug(link, "Setting restart = %s", time_string);
1952
1953 r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
1954 if (r < 0)
1955 return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
1956 }
1957
1958 r = sd_netlink_message_close_container(m);
1959 if (r < 0)
1960 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
1961
1962 r = sd_netlink_message_close_container(m);
1963 if (r < 0)
1964 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
1965
1966 r = sd_netlink_call_async(link->manager->rtnl, m, link_set_handler, link, 0, NULL);
1967 if (r < 0)
1968 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1969
1970 link_ref(link);
1971
1972 if (!(link->flags & IFF_UP)) {
1973 r = link_up_can(link);
1974 if (r < 0) {
1975 link_enter_failed(link);
1976 return r;
1977 }
1978 }
1979
1980 log_link_debug(link, "link_set_can done");
1981
1982 return r;
1983}
1984
1985static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1986 _cleanup_(link_unrefp) Link *link = userdata;
1987 int r;
1988
1989 assert(link);
1990
1991 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1992 return 1;
1993
1994 r = sd_netlink_message_get_errno(m);
1995 if (r < 0)
1996 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1997
1998 if (streq_ptr(link->kind, "can")) {
1999 link_ref(link);
2000 link_set_can(link);
2001 }
2002
2003 return 1;
2004}
2005
2006int link_down(Link *link) {
2007 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2008 int r;
2009
2010 assert(link);
2011 assert(link->manager);
2012 assert(link->manager->rtnl);
2013
2014 log_link_debug(link, "Bringing link down");
2015
2016 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
2017 RTM_SETLINK, link->ifindex);
2018 if (r < 0)
2019 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2020
2021 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
2022 if (r < 0)
2023 return log_link_error_errno(link, r, "Could not set link flags: %m");
2024
2025 r = sd_netlink_call_async(link->manager->rtnl, req, link_down_handler, link, 0, NULL);
2026 if (r < 0)
2027 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2028
2029 link_ref(link);
2030
2031 return 0;
2032}
2033
2034static int link_handle_bound_to_list(Link *link) {
2035 Link *l;
2036 Iterator i;
2037 int r;
2038 bool required_up = false;
2039 bool link_is_up = false;
2040
2041 assert(link);
2042
2043 if (hashmap_isempty(link->bound_to_links))
2044 return 0;
2045
2046 if (link->flags & IFF_UP)
2047 link_is_up = true;
2048
2049 HASHMAP_FOREACH (l, link->bound_to_links, i)
2050 if (link_has_carrier(l)) {
2051 required_up = true;
2052 break;
2053 }
2054
2055 if (!required_up && link_is_up) {
2056 r = link_down(link);
2057 if (r < 0)
2058 return r;
2059 } else if (required_up && !link_is_up) {
2060 r = link_up(link);
2061 if (r < 0)
2062 return r;
2063 }
2064
2065 return 0;
2066}
2067
2068static int link_handle_bound_by_list(Link *link) {
2069 Iterator i;
2070 Link *l;
2071 int r;
2072
2073 assert(link);
2074
2075 if (hashmap_isempty(link->bound_by_links))
2076 return 0;
2077
2078 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2079 r = link_handle_bound_to_list(l);
2080 if (r < 0)
2081 return r;
2082 }
2083
2084 return 0;
2085}
2086
2087static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2088 int r;
2089
2090 assert(link);
2091 assert(carrier);
2092
2093 if (link == carrier)
2094 return 0;
2095
2096 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2097 return 0;
2098
2099 r = hashmap_ensure_allocated(h, NULL);
2100 if (r < 0)
2101 return r;
2102
2103 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2104 if (r < 0)
2105 return r;
2106
2107 return 0;
2108}
2109
2110static int link_new_bound_by_list(Link *link) {
2111 Manager *m;
2112 Link *carrier;
2113 Iterator i;
2114 int r;
2115 bool list_updated = false;
2116
2117 assert(link);
2118 assert(link->manager);
2119
2120 m = link->manager;
2121
2122 HASHMAP_FOREACH(carrier, m->links, i) {
2123 if (!carrier->network)
2124 continue;
2125
2126 if (strv_isempty(carrier->network->bind_carrier))
2127 continue;
2128
2129 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2130 r = link_put_carrier(link, carrier, &link->bound_by_links);
2131 if (r < 0)
2132 return r;
2133
2134 list_updated = true;
2135 }
2136 }
2137
2138 if (list_updated)
2139 link_dirty(link);
2140
2141 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2142 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2143 if (r < 0)
2144 return r;
2145
2146 link_dirty(carrier);
2147 }
2148
2149 return 0;
2150}
2151
2152static int link_new_bound_to_list(Link *link) {
2153 Manager *m;
2154 Link *carrier;
2155 Iterator i;
2156 int r;
2157 bool list_updated = false;
2158
2159 assert(link);
2160 assert(link->manager);
2161
2162 if (!link->network)
2163 return 0;
2164
2165 if (strv_isempty(link->network->bind_carrier))
2166 return 0;
2167
2168 m = link->manager;
2169
2170 HASHMAP_FOREACH (carrier, m->links, i) {
2171 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2172 r = link_put_carrier(link, carrier, &link->bound_to_links);
2173 if (r < 0)
2174 return r;
2175
2176 list_updated = true;
2177 }
2178 }
2179
2180 if (list_updated)
2181 link_dirty(link);
2182
2183 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2184 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2185 if (r < 0)
2186 return r;
2187
2188 link_dirty(carrier);
2189 }
2190
2191 return 0;
2192}
2193
2194static int link_new_carrier_maps(Link *link) {
2195 int r;
2196
2197 r = link_new_bound_by_list(link);
2198 if (r < 0)
2199 return r;
2200
2201 r = link_handle_bound_by_list(link);
2202 if (r < 0)
2203 return r;
2204
2205 r = link_new_bound_to_list(link);
2206 if (r < 0)
2207 return r;
2208
2209 r = link_handle_bound_to_list(link);
2210 if (r < 0)
2211 return r;
2212
2213 return 0;
2214}
2215
2216static void link_free_bound_to_list(Link *link) {
2217 Link *bound_to;
2218 Iterator i;
2219
2220 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2221 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2222
2223 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2224 link_dirty(bound_to);
2225 }
2226
2227 return;
2228}
2229
2230static void link_free_bound_by_list(Link *link) {
2231 Link *bound_by;
2232 Iterator i;
2233
2234 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2235 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2236
2237 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2238 link_dirty(bound_by);
2239 link_handle_bound_to_list(bound_by);
2240 }
2241 }
2242
2243 return;
2244}
2245
2246static void link_free_carrier_maps(Link *link) {
2247 bool list_updated = false;
2248
2249 assert(link);
2250
2251 if (!hashmap_isempty(link->bound_to_links)) {
2252 link_free_bound_to_list(link);
2253 list_updated = true;
2254 }
2255
2256 if (!hashmap_isempty(link->bound_by_links)) {
2257 link_free_bound_by_list(link);
2258 list_updated = true;
2259 }
2260
2261 if (list_updated)
2262 link_dirty(link);
2263
2264 return;
2265}
2266
2267void link_drop(Link *link) {
2268 if (!link || link->state == LINK_STATE_LINGER)
2269 return;
2270
2271 link_set_state(link, LINK_STATE_LINGER);
2272
2273 link_free_carrier_maps(link);
2274
2275 log_link_debug(link, "Link removed");
2276
2277 (void) unlink(link->state_file);
2278 link_unref(link);
2279
2280 return;
2281}
2282
2283static int link_joined(Link *link) {
2284 int r;
2285
2286 assert(link);
2287 assert(link->network);
2288
2289 if (!hashmap_isempty(link->bound_to_links)) {
2290 r = link_handle_bound_to_list(link);
2291 if (r < 0)
2292 return r;
2293 } else if (!(link->flags & IFF_UP)) {
2294 r = link_up(link);
2295 if (r < 0) {
2296 link_enter_failed(link);
2297 return r;
2298 }
2299 }
2300
2301 if (link->network->bridge) {
2302 r = link_set_bridge(link);
2303 if (r < 0)
2304 log_link_error_errno(link, r, "Could not set bridge message: %m");
2305 }
2306
2307 if (link->network->bond) {
2308 r = link_bond_set(link);
2309 if (r < 0)
2310 log_link_error_errno(link, r, "Could not set bond message: %m");
2311 }
2312
2313 if (link->network->use_br_vlan &&
2314 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2315 r = link_set_bridge_vlan(link);
2316 if (r < 0)
2317 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2318 }
2319
2320 /* Skip setting up addresses until it gets carrier,
2321 or it would try to set addresses twice,
2322 which is bad for non-idempotent steps. */
2323 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2324 return 0;
2325
2326 return link_enter_set_addresses(link);
2327}
2328
2329static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
2330 _cleanup_(link_unrefp) Link *link = userdata;
2331 int r;
2332
2333 assert(link);
2334 assert(link->network);
2335
2336 link->enslaving--;
2337
2338 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2339 return 1;
2340
2341 r = sd_netlink_message_get_errno(m);
2342 if (r < 0 && r != -EEXIST) {
2343 log_link_error_errno(link, r, "Could not join netdev: %m");
2344 link_enter_failed(link);
2345 return 1;
2346 } else
2347 log_link_debug(link, "Joined netdev");
2348
2349 if (link->enslaving <= 0)
2350 link_joined(link);
2351
2352 return 1;
2353}
2354
2355static int link_enter_join_netdev(Link *link) {
2356 NetDev *netdev;
2357 Iterator i;
2358 int r;
2359
2360 assert(link);
2361 assert(link->network);
2362 assert(link->state == LINK_STATE_PENDING);
2363
2364 link_set_state(link, LINK_STATE_ENSLAVING);
2365
2366 link_dirty(link);
2367
2368 if (!link->network->bridge &&
2369 !link->network->bond &&
2370 !link->network->vrf &&
2371 hashmap_isempty(link->network->stacked_netdevs))
2372 return link_joined(link);
2373
2374 if (link->network->bond) {
2375 log_struct(LOG_DEBUG,
2376 LOG_LINK_INTERFACE(link),
2377 LOG_NETDEV_INTERFACE(link->network->bond),
2378 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2379
2380 r = netdev_join(link->network->bond, link, netdev_join_handler);
2381 if (r < 0) {
2382 log_struct_errno(LOG_WARNING, r,
2383 LOG_LINK_INTERFACE(link),
2384 LOG_NETDEV_INTERFACE(link->network->bond),
2385 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2386 link_enter_failed(link);
2387 return r;
2388 }
2389
2390 link->enslaving++;
2391 }
2392
2393 if (link->network->bridge) {
2394 log_struct(LOG_DEBUG,
2395 LOG_LINK_INTERFACE(link),
2396 LOG_NETDEV_INTERFACE(link->network->bridge),
2397 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2398
2399 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2400 if (r < 0) {
2401 log_struct_errno(LOG_WARNING, r,
2402 LOG_LINK_INTERFACE(link),
2403 LOG_NETDEV_INTERFACE(link->network->bridge),
2404 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2405 link_enter_failed(link);
2406 return r;
2407 }
2408
2409 link->enslaving++;
2410 }
2411
2412 if (link->network->vrf) {
2413 log_struct(LOG_DEBUG,
2414 LOG_LINK_INTERFACE(link),
2415 LOG_NETDEV_INTERFACE(link->network->vrf),
2416 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2417
2418 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2419 if (r < 0) {
2420 log_struct_errno(LOG_WARNING, r,
2421 LOG_LINK_INTERFACE(link),
2422 LOG_NETDEV_INTERFACE(link->network->vrf),
2423 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2424 link_enter_failed(link);
2425 return r;
2426 }
2427
2428 link->enslaving++;
2429 }
2430
2431 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2432
2433 if (netdev->ifindex > 0) {
2434 link_joined(link);
2435 continue;
2436 }
2437
2438 log_struct(LOG_DEBUG,
2439 LOG_LINK_INTERFACE(link),
2440 LOG_NETDEV_INTERFACE(netdev),
2441 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2442
2443 r = netdev_join(netdev, link, netdev_join_handler);
2444 if (r < 0) {
2445 log_struct_errno(LOG_WARNING, r,
2446 LOG_LINK_INTERFACE(link),
2447 LOG_NETDEV_INTERFACE(netdev),
2448 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2449 link_enter_failed(link);
2450 return r;
2451 }
2452
2453 link->enslaving++;
2454 }
2455
2456 return 0;
2457}
2458
2459static int link_set_ipv4_forward(Link *link) {
2460 int r;
2461
2462 if (!link_ipv4_forward_enabled(link))
2463 return 0;
2464
2465 /* We propagate the forwarding flag from one interface to the
2466 * global setting one way. This means: as long as at least one
2467 * interface was configured at any time that had IP forwarding
2468 * enabled the setting will stay on for good. We do this
2469 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2470 * somewhat in sync (see below). */
2471
2472 r = write_string_file("/proc/sys/net/ipv4/ip_forward", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2473 if (r < 0)
2474 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2475
2476 return 0;
2477}
2478
2479static int link_set_ipv6_forward(Link *link) {
2480 int r;
2481
2482 if (!link_ipv6_forward_enabled(link))
2483 return 0;
2484
2485 /* On Linux, the IPv6 stack does not know a per-interface
2486 * packet forwarding setting: either packet forwarding is on
2487 * for all, or off for all. We hence don't bother with a
2488 * per-interface setting, but simply propagate the interface
2489 * flag, if it is set, to the global flag, one-way. Note that
2490 * while IPv4 would allow a per-interface flag, we expose the
2491 * same behaviour there and also propagate the setting from
2492 * one to all, to keep things simple (see above). */
2493
2494 r = write_string_file("/proc/sys/net/ipv6/conf/all/forwarding", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2495 if (r < 0)
2496 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2497
2498 return 0;
2499}
2500
2501static int link_set_ipv6_privacy_extensions(Link *link) {
2502 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2503 IPv6PrivacyExtensions s;
2504 const char *p = NULL;
2505 int r;
2506
2507 s = link_ipv6_privacy_extensions(link);
2508 if (s < 0)
2509 return 0;
2510
2511 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/use_tempaddr");
2512 xsprintf(buf, "%u", (unsigned) link->network->ipv6_privacy_extensions);
2513
2514 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2515 if (r < 0)
2516 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2517
2518 return 0;
2519}
2520
2521static int link_set_ipv6_accept_ra(Link *link) {
2522 const char *p = NULL;
2523 int r;
2524
2525 /* Make this a NOP if IPv6 is not available */
2526 if (!socket_ipv6_is_supported())
2527 return 0;
2528
2529 if (link->flags & IFF_LOOPBACK)
2530 return 0;
2531
2532 if (!link->network)
2533 return 0;
2534
2535 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/accept_ra");
2536
2537 /* We handle router advertisements ourselves, tell the kernel to GTFO */
2538 r = write_string_file(p, "0", WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2539 if (r < 0)
2540 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2541
2542 return 0;
2543}
2544
2545static int link_set_ipv6_dad_transmits(Link *link) {
2546 char buf[DECIMAL_STR_MAX(int) + 1];
2547 const char *p = NULL;
2548 int r;
2549
2550 /* Make this a NOP if IPv6 is not available */
2551 if (!socket_ipv6_is_supported())
2552 return 0;
2553
2554 if (link->flags & IFF_LOOPBACK)
2555 return 0;
2556
2557 if (!link->network)
2558 return 0;
2559
2560 if (link->network->ipv6_dad_transmits < 0)
2561 return 0;
2562
2563 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/dad_transmits");
2564 xsprintf(buf, "%i", link->network->ipv6_dad_transmits);
2565
2566 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2567 if (r < 0)
2568 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2569
2570 return 0;
2571}
2572
2573static int link_set_ipv6_hop_limit(Link *link) {
2574 char buf[DECIMAL_STR_MAX(int) + 1];
2575 const char *p = NULL;
2576 int r;
2577
2578 /* Make this a NOP if IPv6 is not available */
2579 if (!socket_ipv6_is_supported())
2580 return 0;
2581
2582 if (link->flags & IFF_LOOPBACK)
2583 return 0;
2584
2585 if (!link->network)
2586 return 0;
2587
2588 if (link->network->ipv6_hop_limit < 0)
2589 return 0;
2590
2591 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/hop_limit");
2592 xsprintf(buf, "%i", link->network->ipv6_hop_limit);
2593
2594 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE);
2595 if (r < 0)
2596 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2597
2598 return 0;
2599}
2600
2601static int link_set_ipv6_mtu(Link *link) {
2602 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2603 const char *p = NULL;
2604 int r;
2605
2606 /* Make this a NOP if IPv6 is not available */
2607 if (!socket_ipv6_is_supported())
2608 return 0;
2609
2610 if (link->flags & IFF_LOOPBACK)
2611 return 0;
2612
2613 if (link->network->ipv6_mtu == 0)
2614 return 0;
2615
2616 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/mtu");
2617
2618 xsprintf(buf, "%" PRIu32, link->network->ipv6_mtu);
2619
2620 r = write_string_file(p, buf, 0);
2621 if (r < 0)
2622 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2623
2624 return 0;
2625}
2626
2627static int link_drop_foreign_config(Link *link) {
2628 Address *address;
2629 Route *route;
2630 Iterator i;
2631 int r;
2632
2633 SET_FOREACH(address, link->addresses_foreign, i) {
2634 /* we consider IPv6LL addresses to be managed by the kernel */
2635 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2636 continue;
2637
2638 r = address_remove(address, link, link_address_remove_handler);
2639 if (r < 0)
2640 return r;
2641 }
2642
2643 SET_FOREACH(route, link->routes_foreign, i) {
2644 /* do not touch routes managed by the kernel */
2645 if (route->protocol == RTPROT_KERNEL)
2646 continue;
2647
2648 r = route_remove(route, link, link_route_remove_handler);
2649 if (r < 0)
2650 return r;
2651 }
2652
2653 return 0;
2654}
2655
2656static int link_drop_config(Link *link) {
2657 Address *address, *pool_address;
2658 Route *route;
2659 Iterator i;
2660 int r;
2661
2662 SET_FOREACH(address, link->addresses, i) {
2663 /* we consider IPv6LL addresses to be managed by the kernel */
2664 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2665 continue;
2666
2667 r = address_remove(address, link, link_address_remove_handler);
2668 if (r < 0)
2669 return r;
2670
2671 /* If this address came from an address pool, clean up the pool */
2672 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2673 if (address_equal(address, pool_address)) {
2674 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2675 address_free(pool_address);
2676 break;
2677 }
2678 }
2679 }
2680
2681 SET_FOREACH(route, link->routes, i) {
2682 /* do not touch routes managed by the kernel */
2683 if (route->protocol == RTPROT_KERNEL)
2684 continue;
2685
2686 r = route_remove(route, link, link_route_remove_handler);
2687 if (r < 0)
2688 return r;
2689 }
2690
2691 ndisc_flush(link);
2692
2693 return 0;
2694}
2695
2696static int link_update_lldp(Link *link) {
2697 int r;
2698
2699 assert(link);
2700
2701 if (!link->lldp)
2702 return 0;
2703
2704 if (link->flags & IFF_UP) {
2705 r = sd_lldp_start(link->lldp);
2706 if (r > 0)
2707 log_link_debug(link, "Started LLDP.");
2708 } else {
2709 r = sd_lldp_stop(link->lldp);
2710 if (r > 0)
2711 log_link_debug(link, "Stopped LLDP.");
2712 }
2713
2714 return r;
2715}
2716
2717static int link_configure_can(Link *link) {
2718 int r;
2719
2720 if (streq_ptr(link->kind, "can")) {
2721 /* The CAN interface must be down to configure bitrate, etc... */
2722 if ((link->flags & IFF_UP)) {
2723 r = link_down(link);
2724 if (r < 0) {
2725 link_enter_failed(link);
2726 return r;
2727 }
2728
2729 return 0;
2730 }
2731
2732 return link_set_can(link);
2733 }
2734
2735 if (!(link->flags & IFF_UP)) {
2736 r = link_up_can(link);
2737 if (r < 0) {
2738 link_enter_failed(link);
2739 return r;
2740 }
2741 }
2742
2743 return 0;
2744}
2745
2746static int link_configure(Link *link) {
2747 int r;
2748
2749 assert(link);
2750 assert(link->network);
2751 assert(link->state == LINK_STATE_PENDING);
2752
2753 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
2754 return link_configure_can(link);
2755
2756 /* Drop foreign config, but ignore loopback or critical devices.
2757 * We do not want to remove loopback address or addresses used for root NFS. */
2758 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2759 r = link_drop_foreign_config(link);
2760 if (r < 0)
2761 return r;
2762 }
2763
2764 r = link_set_proxy_arp(link);
2765 if (r < 0)
2766 return r;
2767
2768 r = ipv6_proxy_ndp_addresses_configure(link);
2769 if (r < 0)
2770 return r;
2771
2772 r = link_set_ipv4_forward(link);
2773 if (r < 0)
2774 return r;
2775
2776 r = link_set_ipv6_forward(link);
2777 if (r < 0)
2778 return r;
2779
2780 r = link_set_ipv6_privacy_extensions(link);
2781 if (r < 0)
2782 return r;
2783
2784 r = link_set_ipv6_accept_ra(link);
2785 if (r < 0)
2786 return r;
2787
2788 r = link_set_ipv6_dad_transmits(link);
2789 if (r < 0)
2790 return r;
2791
2792 r = link_set_ipv6_hop_limit(link);
2793 if (r < 0)
2794 return r;
2795
2796 r = link_set_flags(link);
2797 if (r < 0)
2798 return r;
2799
2800 r = link_set_ipv6_mtu(link);
2801 if (r < 0)
2802 return r;
2803
2804 if (link_ipv4ll_enabled(link)) {
2805 r = ipv4ll_configure(link);
2806 if (r < 0)
2807 return r;
2808 }
2809
2810 if (link_dhcp4_enabled(link)) {
2811 r = dhcp4_set_promote_secondaries(link);
2812 if (r < 0)
2813 return r;
2814
2815 r = dhcp4_configure(link);
2816 if (r < 0)
2817 return r;
2818 }
2819
2820 if (link_dhcp4_server_enabled(link)) {
2821 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2822 if (r < 0)
2823 return r;
2824
2825 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2826 if (r < 0)
2827 return r;
2828 }
2829
2830 if (link_dhcp6_enabled(link) ||
2831 link_ipv6_accept_ra_enabled(link)) {
2832 r = dhcp6_configure(link);
2833 if (r < 0)
2834 return r;
2835 }
2836
2837 if (link_ipv6_accept_ra_enabled(link)) {
2838 r = ndisc_configure(link);
2839 if (r < 0)
2840 return r;
2841 }
2842
2843 if (link_radv_enabled(link)) {
2844 r = radv_configure(link);
2845 if (r < 0)
2846 return r;
2847 }
2848
2849 if (link_lldp_rx_enabled(link)) {
2850 r = sd_lldp_new(&link->lldp);
2851 if (r < 0)
2852 return r;
2853
2854 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
2855 if (r < 0)
2856 return r;
2857
2858 r = sd_lldp_match_capabilities(link->lldp,
2859 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
2860 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
2861 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
2862 if (r < 0)
2863 return r;
2864
2865 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
2866 if (r < 0)
2867 return r;
2868
2869 r = sd_lldp_attach_event(link->lldp, NULL, 0);
2870 if (r < 0)
2871 return r;
2872
2873 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
2874 if (r < 0)
2875 return r;
2876
2877 r = link_update_lldp(link);
2878 if (r < 0)
2879 return r;
2880 }
2881
2882 if (link->network->mtu > 0) {
2883 r = link_set_mtu(link, link->network->mtu);
2884 if (r < 0)
2885 return r;
2886 }
2887
2888 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2889 r = link_acquire_conf(link);
2890 if (r < 0)
2891 return r;
2892 }
2893
2894 return link_enter_join_netdev(link);
2895}
2896
2897static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
2898 assert(duid);
2899
2900 if (duid->raw_data_len > 0)
2901 return 0;
2902
2903 if (duid->type != DUID_TYPE_UUID)
2904 return -EINVAL;
2905
2906 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
2907 duid->raw_data_len = sizeof(sd_id128_t);
2908
2909 return 1;
2910}
2911
2912int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
2913 Manager *manager = userdata;
2914 const sd_bus_error *e;
2915 const void *a;
2916 size_t sz;
2917 DUID *duid;
2918 Link *link;
2919 int r;
2920
2921 assert(m);
2922 assert(manager);
2923
2924 e = sd_bus_message_get_error(m);
2925 if (e) {
2926 log_error_errno(sd_bus_error_get_errno(e),
2927 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
2928 e->message);
2929 goto configure;
2930 }
2931
2932 r = sd_bus_message_read_array(m, 'y', &a, &sz);
2933 if (r < 0)
2934 goto configure;
2935
2936 if (sz != sizeof(sd_id128_t)) {
2937 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
2938 goto configure;
2939 }
2940
2941 memcpy(&manager->product_uuid, a, sz);
2942 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
2943 (void) duid_set_uuid(duid, manager->product_uuid);
2944
2945 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
2946
2947configure:
2948 while ((link = set_steal_first(manager->links_requesting_uuid))) {
2949 r = link_configure(link);
2950 if (r < 0)
2951 log_link_error_errno(link, r, "Failed to configure link: %m");
2952 }
2953
2954 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
2955
2956 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
2957 * even if the method fails. */
2958 manager->has_product_uuid = true;
2959
2960 return 1;
2961}
2962
2963static bool link_requires_uuid(Link *link) {
2964 const DUID *duid;
2965
2966 assert(link);
2967 assert(link->manager);
2968 assert(link->network);
2969
2970 duid = link_get_duid(link);
2971 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
2972 return false;
2973
2974 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
2975 return true;
2976
2977 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
2978 return true;
2979
2980 return false;
2981}
2982
2983static int link_configure_duid(Link *link) {
2984 Manager *m;
2985 DUID *duid;
2986 int r;
2987
2988 assert(link);
2989 assert(link->manager);
2990 assert(link->network);
2991
2992 m = link->manager;
2993 duid = link_get_duid(link);
2994
2995 if (!link_requires_uuid(link))
2996 return 1;
2997
2998 if (m->has_product_uuid) {
2999 (void) duid_set_uuid(duid, m->product_uuid);
3000 return 1;
3001 }
3002
3003 if (!m->links_requesting_uuid) {
3004 r = manager_request_product_uuid(m, link);
3005 if (r < 0) {
3006 if (r == -ENOMEM)
3007 return r;
3008
3009 log_link_warning_errno(link, r,
3010 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3011 return 1;
3012 }
3013 } else {
3014 r = set_put(m->links_requesting_uuid, link);
3015 if (r < 0)
3016 return log_oom();
3017
3018 r = set_put(m->duids_requesting_uuid, duid);
3019 if (r < 0)
3020 return log_oom();
3021 }
3022
3023 return 0;
3024}
3025
3026static int link_initialized_and_synced(sd_netlink *rtnl, sd_netlink_message *m,
3027 void *userdata) {
3028 _cleanup_(link_unrefp) Link *link = userdata;
3029 Network *network;
3030 int r;
3031
3032 assert(link);
3033 assert(link->ifname);
3034 assert(link->manager);
3035
3036 if (link->state != LINK_STATE_PENDING)
3037 return 1;
3038
3039 log_link_debug(link, "Link state is up-to-date");
3040
3041 r = link_new_bound_by_list(link);
3042 if (r < 0)
3043 return r;
3044
3045 r = link_handle_bound_by_list(link);
3046 if (r < 0)
3047 return r;
3048
3049 if (!link->network) {
3050 r = network_get(link->manager, link->sd_device, link->ifname,
3051 &link->mac, &network);
3052 if (r == -ENOENT) {
3053 link_enter_unmanaged(link);
3054 return 1;
3055 } else if (r == 0 && network->unmanaged) {
3056 link_enter_unmanaged(link);
3057 return 0;
3058 } else if (r < 0)
3059 return r;
3060
3061 if (link->flags & IFF_LOOPBACK) {
3062 if (network->link_local != ADDRESS_FAMILY_NO)
3063 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3064
3065 if (network->dhcp != ADDRESS_FAMILY_NO)
3066 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3067
3068 if (network->dhcp_server)
3069 log_link_debug(link, "Ignoring DHCP server for loopback link");
3070 }
3071
3072 r = network_apply(network, link);
3073 if (r < 0)
3074 return r;
3075 }
3076
3077 r = link_new_bound_to_list(link);
3078 if (r < 0)
3079 return r;
3080
3081 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3082 * link_configure() is called later asynchronously. */
3083 r = link_configure_duid(link);
3084 if (r <= 0)
3085 return r;
3086
3087 r = link_configure(link);
3088 if (r < 0)
3089 return r;
3090
3091 return 1;
3092}
3093
3094int link_initialized(Link *link, sd_device *device) {
3095 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3096 int r;
3097
3098 assert(link);
3099 assert(link->manager);
3100 assert(link->manager->rtnl);
3101 assert(device);
3102
3103 if (link->state != LINK_STATE_PENDING)
3104 return 0;
3105
3106 if (link->sd_device)
3107 return 0;
3108
3109 log_link_debug(link, "udev initialized link");
3110
3111 link->sd_device = sd_device_ref(device);
3112
3113 /* udev has initialized the link, but we don't know if we have yet
3114 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3115 * when it returns we know that the pending NEWLINKs have already been
3116 * processed and that we are up-to-date */
3117
3118 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3119 link->ifindex);
3120 if (r < 0)
3121 return r;
3122
3123 r = sd_netlink_call_async(link->manager->rtnl, req,
3124 link_initialized_and_synced, link, 0, NULL);
3125 if (r < 0)
3126 return r;
3127
3128 link_ref(link);
3129
3130 return 0;
3131}
3132
3133static int link_load(Link *link) {
3134 _cleanup_free_ char *network_file = NULL,
3135 *addresses = NULL,
3136 *routes = NULL,
3137 *dhcp4_address = NULL,
3138 *ipv4ll_address = NULL;
3139 union in_addr_union address;
3140 union in_addr_union route_dst;
3141 const char *p;
3142 int r;
3143
3144 assert(link);
3145
3146 r = parse_env_file(NULL, link->state_file, NEWLINE,
3147 "NETWORK_FILE", &network_file,
3148 "ADDRESSES", &addresses,
3149 "ROUTES", &routes,
3150 "DHCP4_ADDRESS", &dhcp4_address,
3151 "IPV4LL_ADDRESS", &ipv4ll_address,
3152 NULL);
3153 if (r < 0 && r != -ENOENT)
3154 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3155
3156 if (network_file) {
3157 Network *network;
3158 char *suffix;
3159
3160 /* drop suffix */
3161 suffix = strrchr(network_file, '.');
3162 if (!suffix) {
3163 log_link_debug(link, "Failed to get network name from %s", network_file);
3164 goto network_file_fail;
3165 }
3166 *suffix = '\0';
3167
3168 r = network_get_by_name(link->manager, basename(network_file), &network);
3169 if (r < 0) {
3170 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3171 goto network_file_fail;
3172 }
3173
3174 r = network_apply(network, link);
3175 if (r < 0)
3176 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3177 }
3178
3179network_file_fail:
3180
3181 if (addresses) {
3182 p = addresses;
3183
3184 for (;;) {
3185 _cleanup_free_ char *address_str = NULL;
3186 char *prefixlen_str;
3187 int family;
3188 unsigned char prefixlen;
3189
3190 r = extract_first_word(&p, &address_str, NULL, 0);
3191 if (r < 0) {
3192 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3193 continue;
3194 }
3195 if (r == 0)
3196 break;
3197
3198 prefixlen_str = strchr(address_str, '/');
3199 if (!prefixlen_str) {
3200 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3201 continue;
3202 }
3203
3204 *prefixlen_str++ = '\0';
3205
3206 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3207 if (r != 1) {
3208 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3209 continue;
3210 }
3211
3212 r = in_addr_from_string_auto(address_str, &family, &address);
3213 if (r < 0) {
3214 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3215 continue;
3216 }
3217
3218 r = address_add(link, family, &address, prefixlen, NULL);
3219 if (r < 0)
3220 return log_link_error_errno(link, r, "Failed to add address: %m");
3221 }
3222 }
3223
3224 if (routes) {
3225 p = routes;
3226
3227 for (;;) {
3228 Route *route;
3229 _cleanup_free_ char *route_str = NULL;
3230 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3231 usec_t lifetime;
3232 char *prefixlen_str;
3233 int family;
3234 unsigned char prefixlen, tos, table;
3235 uint32_t priority;
3236
3237 r = extract_first_word(&p, &route_str, NULL, 0);
3238 if (r < 0) {
3239 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3240 continue;
3241 }
3242 if (r == 0)
3243 break;
3244
3245 prefixlen_str = strchr(route_str, '/');
3246 if (!prefixlen_str) {
3247 log_link_debug(link, "Failed to parse route %s", route_str);
3248 continue;
3249 }
3250
3251 *prefixlen_str++ = '\0';
3252
3253 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3254 if (r != 5) {
3255 log_link_debug(link,
3256 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3257 prefixlen_str);
3258 continue;
3259 }
3260
3261 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3262 if (r < 0) {
3263 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3264 continue;
3265 }
3266
3267 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3268 if (r < 0)
3269 return log_link_error_errno(link, r, "Failed to add route: %m");
3270
3271 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3272 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3273 0, route_expire_handler, route);
3274 if (r < 0)
3275 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3276 }
3277
3278 route->lifetime = lifetime;
3279 sd_event_source_unref(route->expire);
3280 route->expire = TAKE_PTR(expire);
3281 }
3282 }
3283
3284 if (dhcp4_address) {
3285 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3286 if (r < 0) {
3287 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3288 goto dhcp4_address_fail;
3289 }
3290
3291 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3292 if (r < 0)
3293 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3294
3295 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3296 if (r < 0)
3297 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3298 }
3299
3300dhcp4_address_fail:
3301
3302 if (ipv4ll_address) {
3303 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3304 if (r < 0) {
3305 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3306 goto ipv4ll_address_fail;
3307 }
3308
3309 r = sd_ipv4ll_new(&link->ipv4ll);
3310 if (r < 0)
3311 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3312
3313 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3314 if (r < 0)
3315 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3316 }
3317
3318ipv4ll_address_fail:
3319
3320 return 0;
3321}
3322
3323int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3324 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3325 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3326 int initialized, r;
3327 Link *link;
3328
3329 assert(m);
3330 assert(m->rtnl);
3331 assert(message);
3332 assert(ret);
3333
3334 r = link_new(m, message, ret);
3335 if (r < 0)
3336 return r;
3337
3338 link = *ret;
3339
3340 log_link_debug(link, "Link %d added", link->ifindex);
3341
3342 r = link_load(link);
3343 if (r < 0)
3344 return r;
3345
3346 if (detect_container() <= 0) {
3347 /* not in a container, udev will be around */
3348 sprintf(ifindex_str, "n%d", link->ifindex);
3349 r = sd_device_new_from_device_id(&device, ifindex_str);
3350 if (r < 0) {
3351 log_link_warning_errno(link, r, "Could not find device: %m");
3352 goto failed;
3353 }
3354
3355 r = sd_device_get_is_initialized(device, &initialized);
3356 if (r < 0) {
3357 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3358 goto failed;
3359 }
3360 if (!initialized) {
3361 /* not yet ready */
3362 log_link_debug(link, "link pending udev initialization...");
3363 return 0;
3364 }
3365
3366 r = link_initialized(link, device);
3367 if (r < 0)
3368 goto failed;
3369 } else {
3370 /* we are calling a callback directly, so must take a ref */
3371 link_ref(link);
3372
3373 r = link_initialized_and_synced(m->rtnl, NULL, link);
3374 if (r < 0)
3375 goto failed;
3376 }
3377
3378 return 0;
3379failed:
3380 link_enter_failed(link);
3381 return r;
3382}
3383
3384int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3385 int r;
3386
3387 assert(link);
3388
3389 log_link_info(link, "Gained IPv6LL");
3390
3391 link->ipv6ll_address = *address;
3392 link_check_ready(link);
3393
3394 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3395 r = link_acquire_ipv6_conf(link);
3396 if (r < 0) {
3397 link_enter_failed(link);
3398 return r;
3399 }
3400 }
3401
3402 return 0;
3403}
3404
3405static int link_carrier_gained(Link *link) {
3406 int r;
3407
3408 assert(link);
3409
3410 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3411 r = link_acquire_conf(link);
3412 if (r < 0) {
3413 link_enter_failed(link);
3414 return r;
3415 }
3416
3417 r = link_enter_set_addresses(link);
3418 if (r < 0)
3419 return r;
3420 }
3421
3422 r = link_handle_bound_by_list(link);
3423 if (r < 0)
3424 return r;
3425
3426 return 0;
3427}
3428
3429static int link_carrier_lost(Link *link) {
3430 int r;
3431
3432 assert(link);
3433
3434 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3435 setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3436 configuration and stop the clients as well. */
3437 if (link->setting_mtu)
3438 return 0;
3439
3440 r = link_stop_clients(link);
3441 if (r < 0) {
3442 link_enter_failed(link);
3443 return r;
3444 }
3445
3446 if (link_dhcp4_server_enabled(link))
3447 (void) sd_dhcp_server_stop(link->dhcp_server);
3448
3449 r = link_drop_config(link);
3450 if (r < 0)
3451 return r;
3452
3453 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3454 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3455 r = link_drop_foreign_config(link);
3456 if (r < 0)
3457 return r;
3458 }
3459
3460 r = link_handle_bound_by_list(link);
3461 if (r < 0)
3462 return r;
3463
3464 return 0;
3465}
3466
3467int link_carrier_reset(Link *link) {
3468 int r;
3469
3470 assert(link);
3471
3472 if (link_has_carrier(link)) {
3473 r = link_carrier_lost(link);
3474 if (r < 0)
3475 return r;
3476
3477 r = link_carrier_gained(link);
3478 if (r < 0)
3479 return r;
3480
3481 log_link_info(link, "Reset carrier");
3482 }
3483
3484 return 0;
3485}
3486
3487int link_update(Link *link, sd_netlink_message *m) {
3488 struct ether_addr mac;
3489 const char *ifname;
3490 uint32_t mtu;
3491 bool had_carrier, carrier_gained, carrier_lost;
3492 int r;
3493
3494 assert(link);
3495 assert(link->ifname);
3496 assert(m);
3497
3498 if (link->state == LINK_STATE_LINGER) {
3499 link_ref(link);
3500 log_link_info(link, "Link readded");
3501 link_set_state(link, LINK_STATE_ENSLAVING);
3502
3503 r = link_new_carrier_maps(link);
3504 if (r < 0)
3505 return r;
3506 }
3507
3508 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3509 if (r >= 0 && !streq(ifname, link->ifname)) {
3510 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3511
3512 if (link->state == LINK_STATE_PENDING) {
3513 r = free_and_strdup(&link->ifname, ifname);
3514 if (r < 0)
3515 return r;
3516 } else {
3517 Manager *manager = link->manager;
3518
3519 link_drop(link);
3520 r = link_add(manager, m, &link);
3521 if (r < 0)
3522 return r;
3523 }
3524 }
3525
3526 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3527 if (r >= 0 && mtu > 0) {
3528 link->mtu = mtu;
3529 if (link->original_mtu == 0) {
3530 link->original_mtu = mtu;
3531 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3532 }
3533
3534 if (link->dhcp_client) {
3535 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3536 link->mtu);
3537 if (r < 0)
3538 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3539 }
3540
3541 if (link->radv) {
3542 r = sd_radv_set_mtu(link->radv, link->mtu);
3543 if (r < 0)
3544 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3545 }
3546 }
3547
3548 /* The kernel may broadcast NEWLINK messages without the MAC address
3549 set, simply ignore them. */
3550 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3551 if (r >= 0) {
3552 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3553 ETH_ALEN)) {
3554
3555 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3556 ETH_ALEN);
3557
3558 log_link_debug(link, "MAC address: "
3559 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3560 mac.ether_addr_octet[0],
3561 mac.ether_addr_octet[1],
3562 mac.ether_addr_octet[2],
3563 mac.ether_addr_octet[3],
3564 mac.ether_addr_octet[4],
3565 mac.ether_addr_octet[5]);
3566
3567 if (link->ipv4ll) {
3568 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3569 if (r < 0)
3570 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3571 }
3572
3573 if (link->dhcp_client) {
3574 r = sd_dhcp_client_set_mac(link->dhcp_client,
3575 (const uint8_t *) &link->mac,
3576 sizeof (link->mac),
3577 ARPHRD_ETHER);
3578 if (r < 0)
3579 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3580
3581 r = dhcp4_set_client_identifier(link);
3582 if (r < 0)
3583 return r;
3584 }
3585
3586 if (link->dhcp6_client) {
3587 const DUID* duid = link_get_duid(link);
3588
3589 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3590 (const uint8_t *) &link->mac,
3591 sizeof (link->mac),
3592 ARPHRD_ETHER);
3593 if (r < 0)
3594 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3595
3596 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3597 link->network->iaid);
3598 if (r < 0)
3599 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3600
3601 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3602 duid->type,
3603 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3604 duid->raw_data_len);
3605 if (r < 0)
3606 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3607 }
3608
3609 if (link->radv) {
3610 r = sd_radv_set_mac(link->radv, &link->mac);
3611 if (r < 0)
3612 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3613 }
3614
3615 if (link->ndisc) {
3616 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3617 if (r < 0)
3618 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3619 }
3620 }
3621 }
3622
3623 had_carrier = link_has_carrier(link);
3624
3625 r = link_update_flags(link, m);
3626 if (r < 0)
3627 return r;
3628
3629 r = link_update_lldp(link);
3630 if (r < 0)
3631 return r;
3632
3633 carrier_gained = !had_carrier && link_has_carrier(link);
3634 carrier_lost = had_carrier && !link_has_carrier(link);
3635
3636 if (carrier_gained) {
3637 log_link_info(link, "Gained carrier");
3638
3639 r = link_carrier_gained(link);
3640 if (r < 0)
3641 return r;
3642 } else if (carrier_lost) {
3643 log_link_info(link, "Lost carrier");
3644
3645 r = link_carrier_lost(link);
3646 if (r < 0)
3647 return r;
3648 }
3649
3650 return 0;
3651}
3652
3653static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3654 bool space = false;
3655 Iterator i;
3656 Link *link;
3657
3658 assert(f);
3659 assert(prefix);
3660
3661 if (hashmap_isempty(h))
3662 return;
3663
3664 fputs(prefix, f);
3665 HASHMAP_FOREACH(link, h, i) {
3666 if (space)
3667 fputc(' ', f);
3668
3669 fprintf(f, "%i", link->ifindex);
3670 space = true;
3671 }
3672
3673 fputc('\n', f);
3674}
3675
3676int link_save(Link *link) {
3677 _cleanup_free_ char *temp_path = NULL;
3678 _cleanup_fclose_ FILE *f = NULL;
3679 const char *admin_state, *oper_state;
3680 Address *a;
3681 Route *route;
3682 Iterator i;
3683 int r;
3684
3685 assert(link);
3686 assert(link->state_file);
3687 assert(link->lease_file);
3688 assert(link->manager);
3689
3690 if (link->state == LINK_STATE_LINGER) {
3691 unlink(link->state_file);
3692 return 0;
3693 }
3694
3695 link_lldp_save(link);
3696
3697 admin_state = link_state_to_string(link->state);
3698 assert(admin_state);
3699
3700 oper_state = link_operstate_to_string(link->operstate);
3701 assert(oper_state);
3702
3703 r = fopen_temporary(link->state_file, &f, &temp_path);
3704 if (r < 0)
3705 goto fail;
3706
3707 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
3708 (void) fchmod(fileno(f), 0644);
3709
3710 fprintf(f,
3711 "# This is private data. Do not parse.\n"
3712 "ADMIN_STATE=%s\n"
3713 "OPER_STATE=%s\n",
3714 admin_state, oper_state);
3715
3716 if (link->network) {
3717 bool space;
3718 sd_dhcp6_lease *dhcp6_lease = NULL;
3719 const char *dhcp_domainname = NULL;
3720 char **dhcp6_domains = NULL;
3721 char **dhcp_domains = NULL;
3722 unsigned j;
3723
3724 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3725 yes_no(link->network->required_for_online));
3726
3727 if (link->dhcp6_client) {
3728 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3729 if (r < 0 && r != -ENOMSG)
3730 log_link_debug(link, "No DHCPv6 lease");
3731 }
3732
3733 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3734
3735 fputs("DNS=", f);
3736 space = false;
3737
3738 for (j = 0; j < link->network->n_dns; j++) {
3739 _cleanup_free_ char *b = NULL;
3740
3741 r = in_addr_to_string(link->network->dns[j].family,
3742 &link->network->dns[j].address, &b);
3743 if (r < 0) {
3744 log_debug_errno(r, "Failed to format address, ignoring: %m");
3745 continue;
3746 }
3747
3748 if (space)
3749 fputc(' ', f);
3750 fputs(b, f);
3751 space = true;
3752 }
3753
3754 if (link->network->dhcp_use_dns &&
3755 link->dhcp_lease) {
3756 const struct in_addr *addresses;
3757
3758 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3759 if (r > 0) {
3760 if (space)
3761 fputc(' ', f);
3762 serialize_in_addrs(f, addresses, r);
3763 space = true;
3764 }
3765 }
3766
3767 if (link->network->dhcp_use_dns && dhcp6_lease) {
3768 struct in6_addr *in6_addrs;
3769
3770 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3771 if (r > 0) {
3772 if (space)
3773 fputc(' ', f);
3774 serialize_in6_addrs(f, in6_addrs, r);
3775 space = true;
3776 }
3777 }
3778
3779 /* Make sure to flush out old entries before we use the NDISC data */
3780 ndisc_vacuum(link);
3781
3782 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3783 NDiscRDNSS *dd;
3784
3785 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3786 if (space)
3787 fputc(' ', f);
3788
3789 serialize_in6_addrs(f, &dd->address, 1);
3790 space = true;
3791 }
3792 }
3793
3794 fputc('\n', f);
3795
3796 fputs("NTP=", f);
3797 space = false;
3798 fputstrv(f, link->network->ntp, NULL, &space);
3799
3800 if (link->network->dhcp_use_ntp &&
3801 link->dhcp_lease) {
3802 const struct in_addr *addresses;
3803
3804 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3805 if (r > 0) {
3806 if (space)
3807 fputc(' ', f);
3808 serialize_in_addrs(f, addresses, r);
3809 space = true;
3810 }
3811 }
3812
3813 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3814 struct in6_addr *in6_addrs;
3815 char **hosts;
3816
3817 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3818 &in6_addrs);
3819 if (r > 0) {
3820 if (space)
3821 fputc(' ', f);
3822 serialize_in6_addrs(f, in6_addrs, r);
3823 space = true;
3824 }
3825
3826 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3827 if (r > 0)
3828 fputstrv(f, hosts, NULL, &space);
3829 }
3830
3831 fputc('\n', f);
3832
3833 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3834 if (link->dhcp_lease) {
3835 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3836 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3837 }
3838 if (dhcp6_lease)
3839 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3840 }
3841
3842 fputs("DOMAINS=", f);
3843 space = false;
3844 fputstrv(f, link->network->search_domains, NULL, &space);
3845
3846 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3847 NDiscDNSSL *dd;
3848
3849 if (dhcp_domainname)
3850 fputs_with_space(f, dhcp_domainname, NULL, &space);
3851 if (dhcp_domains)
3852 fputstrv(f, dhcp_domains, NULL, &space);
3853 if (dhcp6_domains)
3854 fputstrv(f, dhcp6_domains, NULL, &space);
3855
3856 SET_FOREACH(dd, link->ndisc_dnssl, i)
3857 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3858 }
3859
3860 fputc('\n', f);
3861
3862 fputs("ROUTE_DOMAINS=", f);
3863 space = false;
3864 fputstrv(f, link->network->route_domains, NULL, &space);
3865
3866 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3867 NDiscDNSSL *dd;
3868
3869 if (dhcp_domainname)
3870 fputs_with_space(f, dhcp_domainname, NULL, &space);
3871 if (dhcp_domains)
3872 fputstrv(f, dhcp_domains, NULL, &space);
3873 if (dhcp6_domains)
3874 fputstrv(f, dhcp6_domains, NULL, &space);
3875
3876 SET_FOREACH(dd, link->ndisc_dnssl, i)
3877 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3878 }
3879
3880 fputc('\n', f);
3881
3882 fprintf(f, "LLMNR=%s\n",
3883 resolve_support_to_string(link->network->llmnr));
3884 fprintf(f, "MDNS=%s\n",
3885 resolve_support_to_string(link->network->mdns));
3886
3887 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3888 fprintf(f, "DNS_OVER_TLS=%s\n",
3889 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
3890
3891 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3892 fprintf(f, "DNSSEC=%s\n",
3893 dnssec_mode_to_string(link->network->dnssec_mode));
3894
3895 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3896 const char *n;
3897
3898 fputs("DNSSEC_NTA=", f);
3899 space = false;
3900 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3901 fputs_with_space(f, n, NULL, &space);
3902 fputc('\n', f);
3903 }
3904
3905 fputs("ADDRESSES=", f);
3906 space = false;
3907 SET_FOREACH(a, link->addresses, i) {
3908 _cleanup_free_ char *address_str = NULL;
3909
3910 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3911 if (r < 0)
3912 goto fail;
3913
3914 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3915 space = true;
3916 }
3917 fputc('\n', f);
3918
3919 fputs("ROUTES=", f);
3920 space = false;
3921 SET_FOREACH(route, link->routes, i) {
3922 _cleanup_free_ char *route_str = NULL;
3923
3924 r = in_addr_to_string(route->family, &route->dst, &route_str);
3925 if (r < 0)
3926 goto fail;
3927
3928 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
3929 space ? " " : "", route_str,
3930 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3931 space = true;
3932 }
3933
3934 fputc('\n', f);
3935 }
3936
3937 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3938 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3939
3940 if (link->dhcp_lease) {
3941 struct in_addr address;
3942 const char *tz = NULL;
3943
3944 assert(link->network);
3945
3946 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3947 if (r >= 0)
3948 fprintf(f, "TIMEZONE=%s\n", tz);
3949
3950 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3951 if (r >= 0) {
3952 fputs("DHCP4_ADDRESS=", f);
3953 serialize_in_addrs(f, &address, 1);
3954 fputc('\n', f);
3955 }
3956
3957 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3958 if (r < 0)
3959 goto fail;
3960
3961 fprintf(f,
3962 "DHCP_LEASE=%s\n",
3963 link->lease_file);
3964 } else
3965 unlink(link->lease_file);
3966
3967 if (link->ipv4ll) {
3968 struct in_addr address;
3969
3970 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3971 if (r >= 0) {
3972 fputs("IPV4LL_ADDRESS=", f);
3973 serialize_in_addrs(f, &address, 1);
3974 fputc('\n', f);
3975 }
3976 }
3977
3978 r = fflush_and_check(f);
3979 if (r < 0)
3980 goto fail;
3981
3982 if (rename(temp_path, link->state_file) < 0) {
3983 r = -errno;
3984 goto fail;
3985 }
3986
3987 return 0;
3988
3989fail:
3990 (void) unlink(link->state_file);
3991 if (temp_path)
3992 (void) unlink(temp_path);
3993
3994 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3995}
3996
3997/* The serialized state in /run is no longer up-to-date. */
3998void link_dirty(Link *link) {
3999 int r;
4000
4001 assert(link);
4002
4003 /* mark manager dirty as link is dirty */
4004 manager_dirty(link->manager);
4005
4006 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
4007 if (r < 0)
4008 /* allocation errors are ignored */
4009 return;
4010
4011 r = set_put(link->manager->dirty_links, link);
4012 if (r <= 0)
4013 /* don't take another ref if the link was already dirty */
4014 return;
4015
4016 link_ref(link);
4017}
4018
4019/* The serialized state in /run is up-to-date */
4020void link_clean(Link *link) {
4021 assert(link);
4022 assert(link->manager);
4023
4024 set_remove(link->manager->dirty_links, link);
4025 link_unref(link);
4026}
4027
4028static const char* const link_state_table[_LINK_STATE_MAX] = {
4029 [LINK_STATE_PENDING] = "pending",
4030 [LINK_STATE_ENSLAVING] = "configuring",
4031 [LINK_STATE_SETTING_ADDRESSES] = "configuring",
4032 [LINK_STATE_SETTING_ROUTES] = "configuring",
4033 [LINK_STATE_CONFIGURED] = "configured",
4034 [LINK_STATE_UNMANAGED] = "unmanaged",
4035 [LINK_STATE_FAILED] = "failed",
4036 [LINK_STATE_LINGER] = "linger",
4037};
4038
4039DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
4040
4041static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
4042 [LINK_OPERSTATE_OFF] = "off",
4043 [LINK_OPERSTATE_NO_CARRIER] = "no-carrier",
4044 [LINK_OPERSTATE_DORMANT] = "dormant",
4045 [LINK_OPERSTATE_CARRIER] = "carrier",
4046 [LINK_OPERSTATE_DEGRADED] = "degraded",
4047 [LINK_OPERSTATE_ROUTABLE] = "routable",
4048};
4049
4050DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
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