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networkd: fix link_up() (#12505)
[thirdparty/systemd.git] / src / network / networkd-link.c
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
8 #include "alloc-util.h"
9 #include "bus-util.h"
10 #include "dhcp-identifier.h"
11 #include "dhcp-lease-internal.h"
12 #include "env-file.h"
13 #include "fd-util.h"
14 #include "fileio.h"
15 #include "missing_network.h"
16 #include "netdev/vrf.h"
17 #include "netlink-util.h"
18 #include "network-internal.h"
19 #include "networkd-ipv6-proxy-ndp.h"
20 #include "networkd-lldp-tx.h"
21 #include "networkd-manager.h"
22 #include "networkd-ndisc.h"
23 #include "networkd-neighbor.h"
24 #include "networkd-radv.h"
25 #include "networkd-routing-policy-rule.h"
26 #include "set.h"
27 #include "socket-util.h"
28 #include "stdio-util.h"
29 #include "string-table.h"
30 #include "strv.h"
31 #include "sysctl-util.h"
32 #include "tmpfile-util.h"
33 #include "udev-util.h"
34 #include "util.h"
35 #include "virt.h"
36
37 uint32_t link_get_vrf_table(Link *link) {
38 return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
39 }
40
41 uint32_t link_get_dhcp_route_table(Link *link) {
42 /* When the interface is part of an VRF use the VRFs routing table, unless
43 * another table is explicitly specified. */
44 if (link->network->dhcp_route_table_set)
45 return link->network->dhcp_route_table;
46 return link_get_vrf_table(link);
47 }
48
49 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
50 if (link->network->ipv6_accept_ra_route_table_set)
51 return link->network->ipv6_accept_ra_route_table;
52 return link_get_vrf_table(link);
53 }
54
55 DUID* link_get_duid(Link *link) {
56 if (link->network->duid.type != _DUID_TYPE_INVALID)
57 return &link->network->duid;
58 else
59 return &link->manager->duid;
60 }
61
62 static bool link_dhcp6_enabled(Link *link) {
63 assert(link);
64
65 if (!socket_ipv6_is_supported())
66 return false;
67
68 if (link->flags & IFF_LOOPBACK)
69 return false;
70
71 if (!link->network)
72 return false;
73
74 if (link->network->bond)
75 return false;
76
77 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
78 return false;
79
80 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
81 }
82
83 static bool link_dhcp4_enabled(Link *link) {
84 assert(link);
85
86 if (link->flags & IFF_LOOPBACK)
87 return false;
88
89 if (!link->network)
90 return false;
91
92 if (link->network->bond)
93 return false;
94
95 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
96 }
97
98 static bool link_dhcp4_server_enabled(Link *link) {
99 assert(link);
100
101 if (link->flags & IFF_LOOPBACK)
102 return false;
103
104 if (!link->network)
105 return false;
106
107 if (link->network->bond)
108 return false;
109
110 return link->network->dhcp_server;
111 }
112
113 bool link_ipv4ll_enabled(Link *link) {
114 assert(link);
115
116 if (link->flags & IFF_LOOPBACK)
117 return false;
118
119 if (!link->network)
120 return false;
121
122 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard"))
123 return false;
124
125 if (link->network->bond)
126 return false;
127
128 return link->network->link_local & ADDRESS_FAMILY_IPV4;
129 }
130
131 bool link_ipv4ll_fallback_enabled(Link *link) {
132 assert(link);
133
134 if (link->flags & IFF_LOOPBACK)
135 return false;
136
137 if (!link->network)
138 return false;
139
140 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard"))
141 return false;
142
143 if (link->network->bond)
144 return false;
145
146 return link->network->link_local & ADDRESS_FAMILY_FALLBACK_IPV4;
147 }
148
149 static bool link_ipv6ll_enabled(Link *link) {
150 assert(link);
151
152 if (!socket_ipv6_is_supported())
153 return false;
154
155 if (link->flags & IFF_LOOPBACK)
156 return false;
157
158 if (!link->network)
159 return false;
160
161 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard"))
162 return false;
163
164 if (link->network->bond)
165 return false;
166
167 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
168 return false;
169
170 return link->network->link_local & ADDRESS_FAMILY_IPV6;
171 }
172
173 static bool link_ipv6_enabled(Link *link) {
174 assert(link);
175
176 if (!socket_ipv6_is_supported())
177 return false;
178
179 if (link->network->bond)
180 return false;
181
182 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
183 return false;
184
185 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
186 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
187 }
188
189 static bool link_radv_enabled(Link *link) {
190 assert(link);
191
192 if (!link_ipv6ll_enabled(link))
193 return false;
194
195 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
196 }
197
198 static bool link_lldp_rx_enabled(Link *link) {
199 assert(link);
200
201 if (link->flags & IFF_LOOPBACK)
202 return false;
203
204 if (link->iftype != ARPHRD_ETHER)
205 return false;
206
207 if (!link->network)
208 return false;
209
210 /* LLDP should be handled on bridge slaves as those have a direct
211 * connection to their peers not on the bridge master. Linux doesn't
212 * even (by default) forward lldp packets to the bridge master.*/
213 if (streq_ptr("bridge", link->kind))
214 return false;
215
216 return link->network->lldp_mode != LLDP_MODE_NO;
217 }
218
219 static bool link_lldp_emit_enabled(Link *link) {
220 assert(link);
221
222 if (link->flags & IFF_LOOPBACK)
223 return false;
224
225 if (link->iftype != ARPHRD_ETHER)
226 return false;
227
228 if (!link->network)
229 return false;
230
231 return link->network->lldp_emit != LLDP_EMIT_NO;
232 }
233
234 static bool link_ipv4_forward_enabled(Link *link) {
235 assert(link);
236
237 if (link->flags & IFF_LOOPBACK)
238 return false;
239
240 if (!link->network)
241 return false;
242
243 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
244 return false;
245
246 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
247 }
248
249 static bool link_ipv6_forward_enabled(Link *link) {
250 assert(link);
251
252 if (!socket_ipv6_is_supported())
253 return false;
254
255 if (link->flags & IFF_LOOPBACK)
256 return false;
257
258 if (!link->network)
259 return false;
260
261 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
262 return false;
263
264 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
265 return false;
266
267 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
268 }
269
270 static bool link_proxy_arp_enabled(Link *link) {
271 assert(link);
272
273 if (link->flags & IFF_LOOPBACK)
274 return false;
275
276 if (!link->network)
277 return false;
278
279 if (link->network->proxy_arp < 0)
280 return false;
281
282 return true;
283 }
284
285 static bool link_ipv6_accept_ra_enabled(Link *link) {
286 assert(link);
287
288 if (!socket_ipv6_is_supported())
289 return false;
290
291 if (link->flags & IFF_LOOPBACK)
292 return false;
293
294 if (!link->network)
295 return false;
296
297 if (!link_ipv6ll_enabled(link))
298 return false;
299
300 /* If unset use system default (enabled if local forwarding is disabled.
301 * disabled if local forwarding is enabled).
302 * If set, ignore or enforce RA independent of local forwarding state.
303 */
304 if (link->network->ipv6_accept_ra < 0)
305 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
306 return !link_ipv6_forward_enabled(link);
307 else if (link->network->ipv6_accept_ra > 0)
308 /* accept RA even if ip_forward is enabled */
309 return true;
310 else
311 /* ignore RA */
312 return false;
313 }
314
315 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
316 assert(link);
317
318 if (!socket_ipv6_is_supported())
319 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
320
321 if (link->flags & IFF_LOOPBACK)
322 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
323
324 if (!link->network)
325 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
326
327 return link->network->ipv6_privacy_extensions;
328 }
329
330 static int link_enable_ipv6(Link *link) {
331 bool disabled;
332 int r;
333
334 if (link->flags & IFF_LOOPBACK)
335 return 0;
336
337 disabled = !link_ipv6_enabled(link);
338
339 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", disabled);
340 if (r < 0)
341 log_link_warning_errno(link, r, "Cannot %s IPv6: %m", enable_disable(!disabled));
342 else
343 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
344
345 return 0;
346 }
347
348 static bool link_is_enslaved(Link *link) {
349 if (link->flags & IFF_SLAVE)
350 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
351 return true;
352
353 if (!link->enslaved_raw)
354 return false;
355
356 if (!link->network)
357 return false;
358
359 if (link->network->bridge)
360 /* TODO: support the case when link is not managed by networkd. */
361 return true;
362
363 return false;
364 }
365
366 static void link_update_master_operstate(Link *link, NetDev *netdev) {
367 Link *master;
368
369 if (!netdev)
370 return;
371
372 if (link_get(link->manager, netdev->ifindex, &master) < 0)
373 return;
374
375 link_update_operstate(master, true);
376 }
377
378 void link_update_operstate(Link *link, bool also_update_master) {
379 LinkOperationalState operstate;
380 Iterator i;
381
382 assert(link);
383
384 if (link->kernel_operstate == IF_OPER_DORMANT)
385 operstate = LINK_OPERSTATE_DORMANT;
386 else if (link_has_carrier(link)) {
387 Address *address;
388 uint8_t scope = RT_SCOPE_NOWHERE;
389
390 /* if we have carrier, check what addresses we have */
391 SET_FOREACH(address, link->addresses, i) {
392 if (!address_is_ready(address))
393 continue;
394
395 if (address->scope < scope)
396 scope = address->scope;
397 }
398
399 /* for operstate we also take foreign addresses into account */
400 SET_FOREACH(address, link->addresses_foreign, i) {
401 if (!address_is_ready(address))
402 continue;
403
404 if (address->scope < scope)
405 scope = address->scope;
406 }
407
408 if (scope < RT_SCOPE_SITE)
409 /* universally accessible addresses found */
410 operstate = LINK_OPERSTATE_ROUTABLE;
411 else if (scope < RT_SCOPE_HOST)
412 /* only link or site local addresses found */
413 operstate = LINK_OPERSTATE_DEGRADED;
414 else
415 /* no useful addresses found */
416 operstate = LINK_OPERSTATE_CARRIER;
417 } else if (link->flags & IFF_UP)
418 operstate = LINK_OPERSTATE_NO_CARRIER;
419 else
420 operstate = LINK_OPERSTATE_OFF;
421
422 if (IN_SET(operstate, LINK_OPERSTATE_DEGRADED, LINK_OPERSTATE_CARRIER) &&
423 link_is_enslaved(link))
424 operstate = LINK_OPERSTATE_ENSLAVED;
425
426 if (operstate >= LINK_OPERSTATE_CARRIER) {
427 Link *slave;
428
429 SET_FOREACH(slave, link->slaves, i) {
430 link_update_operstate(slave, false);
431
432 if (slave->operstate < LINK_OPERSTATE_CARRIER)
433 operstate = LINK_OPERSTATE_DEGRADED_CARRIER;
434 }
435 }
436
437 if (link->operstate != operstate) {
438 link->operstate = operstate;
439 link_send_changed(link, "OperationalState", NULL);
440 link_dirty(link);
441 }
442
443 if (also_update_master && link->network) {
444 link_update_master_operstate(link, link->network->bond);
445 link_update_master_operstate(link, link->network->bridge);
446 }
447 }
448
449 #define FLAG_STRING(string, flag, old, new) \
450 (((old ^ new) & flag) \
451 ? ((old & flag) ? (" -" string) : (" +" string)) \
452 : "")
453
454 static int link_update_flags(Link *link, sd_netlink_message *m) {
455 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
456 uint8_t operstate;
457 int r;
458
459 assert(link);
460
461 r = sd_rtnl_message_link_get_flags(m, &flags);
462 if (r < 0)
463 return log_link_warning_errno(link, r, "Could not get link flags: %m");
464
465 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
466 if (r < 0)
467 /* if we got a message without operstate, take it to mean
468 the state was unchanged */
469 operstate = link->kernel_operstate;
470
471 if ((link->flags == flags) && (link->kernel_operstate == operstate))
472 return 0;
473
474 if (link->flags != flags) {
475 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",
476 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
477 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
478 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
479 FLAG_STRING("UP", IFF_UP, link->flags, flags),
480 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
481 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
482 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
483 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
484 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
485 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
486 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
487 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
488 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
489 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
490 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
491 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
492 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
493 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
494 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
495
496 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
497 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
498 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
499 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
500 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
501 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
502 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
503 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
504
505 /* link flags are currently at most 18 bits, let's align to
506 * printing 20 */
507 if (unknown_flags_added)
508 log_link_debug(link,
509 "Unknown link flags gained: %#.5x (ignoring)",
510 unknown_flags_added);
511
512 if (unknown_flags_removed)
513 log_link_debug(link,
514 "Unknown link flags lost: %#.5x (ignoring)",
515 unknown_flags_removed);
516 }
517
518 link->flags = flags;
519 link->kernel_operstate = operstate;
520
521 link_update_operstate(link, true);
522
523 return 0;
524 }
525
526 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
527 _cleanup_(link_unrefp) Link *link = NULL;
528 uint16_t type;
529 const char *ifname, *kind = NULL;
530 int r, ifindex;
531 unsigned short iftype;
532
533 assert(manager);
534 assert(message);
535 assert(ret);
536
537 /* check for link kind */
538 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
539 if (r == 0) {
540 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
541 r = sd_netlink_message_exit_container(message);
542 if (r < 0)
543 return r;
544 }
545
546 r = sd_netlink_message_get_type(message, &type);
547 if (r < 0)
548 return r;
549 else if (type != RTM_NEWLINK)
550 return -EINVAL;
551
552 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
553 if (r < 0)
554 return r;
555 else if (ifindex <= 0)
556 return -EINVAL;
557
558 r = sd_rtnl_message_link_get_type(message, &iftype);
559 if (r < 0)
560 return r;
561
562 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
563 if (r < 0)
564 return r;
565
566 link = new(Link, 1);
567 if (!link)
568 return -ENOMEM;
569
570 *link = (Link) {
571 .n_ref = 1,
572 .manager = manager,
573 .state = LINK_STATE_PENDING,
574 .rtnl_extended_attrs = true,
575 .ifindex = ifindex,
576 .iftype = iftype,
577 };
578
579 link->ifname = strdup(ifname);
580 if (!link->ifname)
581 return -ENOMEM;
582
583 if (kind) {
584 link->kind = strdup(kind);
585 if (!link->kind)
586 return -ENOMEM;
587 }
588
589 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
590 if (r < 0)
591 log_link_debug_errno(link, r, "New device has no master, continuing without");
592
593 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
594 if (r < 0)
595 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
596
597 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
598 return -ENOMEM;
599
600 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
601 return -ENOMEM;
602
603 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
604 return -ENOMEM;
605
606 r = hashmap_ensure_allocated(&manager->links, NULL);
607 if (r < 0)
608 return r;
609
610 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
611 if (r < 0)
612 return r;
613
614 r = link_update_flags(link, message);
615 if (r < 0)
616 return r;
617
618 *ret = TAKE_PTR(link);
619
620 return 0;
621 }
622
623 static Link *link_free(Link *link) {
624 Address *address;
625
626 assert(link);
627
628 link->routes = set_free_with_destructor(link->routes, route_free);
629 link->routes_foreign = set_free_with_destructor(link->routes_foreign, route_free);
630
631 link->addresses = set_free_with_destructor(link->addresses, address_free);
632 link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free);
633
634 while ((address = link->pool_addresses)) {
635 LIST_REMOVE(addresses, link->pool_addresses, address);
636 address_free(address);
637 }
638
639 sd_dhcp_server_unref(link->dhcp_server);
640 sd_dhcp_client_unref(link->dhcp_client);
641 sd_dhcp_lease_unref(link->dhcp_lease);
642
643 link_lldp_emit_stop(link);
644
645 free(link->lease_file);
646
647 sd_lldp_unref(link->lldp);
648 free(link->lldp_file);
649
650 ndisc_flush(link);
651
652 sd_ipv4ll_unref(link->ipv4ll);
653 sd_dhcp6_client_unref(link->dhcp6_client);
654 sd_ndisc_unref(link->ndisc);
655 sd_radv_unref(link->radv);
656
657 free(link->ifname);
658 free(link->kind);
659
660 (void) unlink(link->state_file);
661 free(link->state_file);
662
663 sd_device_unref(link->sd_device);
664
665 hashmap_free(link->bound_to_links);
666 hashmap_free(link->bound_by_links);
667
668 set_free_with_destructor(link->slaves, link_unref);
669
670 network_unref(link->network);
671
672 return mfree(link);
673 }
674
675 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
676
677 int link_get(Manager *m, int ifindex, Link **ret) {
678 Link *link;
679
680 assert(m);
681 assert(ifindex);
682 assert(ret);
683
684 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
685 if (!link)
686 return -ENODEV;
687
688 *ret = link;
689
690 return 0;
691 }
692
693 static void link_set_state(Link *link, LinkState state) {
694 assert(link);
695
696 if (link->state == state)
697 return;
698
699 log_link_debug(link, "State changed: %s -> %s",
700 link_state_to_string(link->state),
701 link_state_to_string(state));
702
703 link->state = state;
704
705 link_send_changed(link, "AdministrativeState", NULL);
706 }
707
708 static void link_enter_unmanaged(Link *link) {
709 assert(link);
710
711 log_link_debug(link, "Unmanaged");
712
713 link_set_state(link, LINK_STATE_UNMANAGED);
714
715 link_dirty(link);
716 }
717
718 int link_stop_clients(Link *link) {
719 int r = 0, k;
720
721 assert(link);
722 assert(link->manager);
723 assert(link->manager->event);
724
725 if (link->dhcp_client) {
726 k = sd_dhcp_client_stop(link->dhcp_client);
727 if (k < 0)
728 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
729 }
730
731 if (link->ipv4ll) {
732 k = sd_ipv4ll_stop(link->ipv4ll);
733 if (k < 0)
734 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
735 }
736
737 if (link->dhcp6_client) {
738 k = sd_dhcp6_client_stop(link->dhcp6_client);
739 if (k < 0)
740 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
741 }
742
743 if (link->ndisc) {
744 k = sd_ndisc_stop(link->ndisc);
745 if (k < 0)
746 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
747 }
748
749 if (link->radv) {
750 k = sd_radv_stop(link->radv);
751 if (k < 0)
752 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
753 }
754
755 link_lldp_emit_stop(link);
756 return r;
757 }
758
759 void link_enter_failed(Link *link) {
760 assert(link);
761
762 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
763 return;
764
765 log_link_warning(link, "Failed");
766
767 link_set_state(link, LINK_STATE_FAILED);
768
769 link_stop_clients(link);
770
771 link_dirty(link);
772 }
773
774 static Address* link_find_dhcp_server_address(Link *link) {
775 Address *address;
776
777 assert(link);
778 assert(link->network);
779
780 /* The first statically configured address if there is any */
781 LIST_FOREACH(addresses, address, link->network->static_addresses) {
782
783 if (address->family != AF_INET)
784 continue;
785
786 if (in_addr_is_null(address->family, &address->in_addr))
787 continue;
788
789 return address;
790 }
791
792 /* If that didn't work, find a suitable address we got from the pool */
793 LIST_FOREACH(addresses, address, link->pool_addresses) {
794 if (address->family != AF_INET)
795 continue;
796
797 return address;
798 }
799
800 return NULL;
801 }
802
803 static int link_join_netdevs_after_configured(Link *link) {
804 NetDev *netdev;
805 Iterator i;
806 int r;
807
808 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
809 if (netdev->ifindex > 0)
810 /* Assume already enslaved. */
811 continue;
812
813 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
814 continue;
815
816 log_struct(LOG_DEBUG,
817 LOG_LINK_INTERFACE(link),
818 LOG_NETDEV_INTERFACE(netdev),
819 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
820
821 r = netdev_join(netdev, link, NULL);
822 if (r < 0)
823 return log_struct_errno(LOG_WARNING, r,
824 LOG_LINK_INTERFACE(link),
825 LOG_NETDEV_INTERFACE(netdev),
826 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
827 }
828
829 return 0;
830 }
831
832 static void link_enter_configured(Link *link) {
833 assert(link);
834 assert(link->network);
835
836 if (link->state != LINK_STATE_CONFIGURING)
837 return;
838
839 log_link_info(link, "Configured");
840
841 link_set_state(link, LINK_STATE_CONFIGURED);
842
843 (void) link_join_netdevs_after_configured(link);
844
845 link_dirty(link);
846 }
847
848 static int link_request_set_routing_policy_rule(Link *link) {
849 RoutingPolicyRule *rule, *rrule = NULL;
850 int r;
851
852 assert(link);
853 assert(link->network);
854
855 link_set_state(link, LINK_STATE_CONFIGURING);
856 link->routing_policy_rules_configured = false;
857
858 LIST_FOREACH(rules, rule, link->network->rules) {
859 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
860 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif,
861 rule->protocol, &rule->sport, &rule->dport, &rrule);
862 if (r == 0) {
863 (void) routing_policy_rule_make_local(link->manager, rrule);
864 continue;
865 }
866
867 r = routing_policy_rule_configure(rule, link, NULL, false);
868 if (r < 0) {
869 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
870 link_enter_failed(link);
871 return r;
872 }
873
874 link->routing_policy_rule_messages++;
875 }
876
877 routing_policy_rule_purge(link->manager, link);
878 if (link->routing_policy_rule_messages == 0) {
879 link->routing_policy_rules_configured = true;
880 link_check_ready(link);
881 } else
882 log_link_debug(link, "Setting routing policy rules");
883
884 return 0;
885 }
886
887 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
888 int r;
889
890 assert(link);
891 assert(link->route_messages > 0);
892 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
893 LINK_STATE_FAILED, LINK_STATE_LINGER));
894
895 link->route_messages--;
896
897 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
898 return 1;
899
900 r = sd_netlink_message_get_errno(m);
901 if (r < 0 && r != -EEXIST)
902 log_link_warning_errno(link, r, "Could not set route: %m");
903
904 if (link->route_messages == 0) {
905 log_link_debug(link, "Routes set");
906 link->static_routes_configured = true;
907 link_check_ready(link);
908 }
909
910 return 1;
911 }
912
913 int link_request_set_routes(Link *link) {
914 enum {
915 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
916 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
917 _PHASE_MAX
918 } phase;
919 Route *rt;
920 int r;
921
922 assert(link);
923 assert(link->network);
924 assert(link->addresses_configured);
925 assert(link->address_messages == 0);
926 assert(link->state != _LINK_STATE_INVALID);
927
928 link_set_state(link, LINK_STATE_CONFIGURING);
929 link->static_routes_configured = false;
930
931 r = link_request_set_routing_policy_rule(link);
932 if (r < 0)
933 return r;
934
935 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
936 for (phase = 0; phase < _PHASE_MAX; phase++)
937 LIST_FOREACH(routes, rt, link->network->static_routes) {
938
939 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
940 continue;
941
942 r = route_configure(rt, link, route_handler);
943 if (r < 0) {
944 log_link_warning_errno(link, r, "Could not set routes: %m");
945 link_enter_failed(link);
946 return r;
947 }
948
949 link->route_messages++;
950 }
951
952 if (link->route_messages == 0) {
953 link->static_routes_configured = true;
954 link_check_ready(link);
955 } else
956 log_link_debug(link, "Setting routes");
957
958 return 0;
959 }
960
961 void link_check_ready(Link *link) {
962 Address *a;
963 Iterator i;
964
965 assert(link);
966
967 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
968 return;
969
970 if (!link->network)
971 return;
972
973 if (!link->addresses_configured)
974 return;
975
976 if (!link->neighbors_configured)
977 return;
978
979 SET_FOREACH(a, link->addresses, i)
980 if (!address_is_ready(a))
981 return;
982
983 if (!link->addresses_ready) {
984 link->addresses_ready = true;
985 link_request_set_routes(link);
986 }
987
988 if (!link->static_routes_configured)
989 return;
990
991 if (!link->routing_policy_rules_configured)
992 return;
993
994 if (link_ipv4ll_enabled(link) && !(link->ipv4ll_address && link->ipv4ll_route))
995 return;
996
997 if (link_ipv6ll_enabled(link) &&
998 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
999 return;
1000
1001 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
1002 !(link->dhcp4_configured || link->dhcp6_configured) &&
1003 !(link_ipv4ll_fallback_enabled(link) && link->ipv4ll_address && link->ipv4ll_route))
1004 /* When DHCP is enabled, at least one protocol must provide an address, or
1005 * an IPv4ll fallback address must be configured. */
1006 return;
1007
1008 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
1009 return;
1010
1011 if (link->state != LINK_STATE_CONFIGURED)
1012 link_enter_configured(link);
1013
1014 return;
1015 }
1016
1017 static int link_request_set_neighbors(Link *link) {
1018 Neighbor *neighbor;
1019 int r;
1020
1021 assert(link);
1022 assert(link->network);
1023 assert(link->state != _LINK_STATE_INVALID);
1024
1025 link_set_state(link, LINK_STATE_CONFIGURING);
1026 link->neighbors_configured = false;
1027
1028 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1029 r = neighbor_configure(neighbor, link, NULL);
1030 if (r < 0) {
1031 log_link_warning_errno(link, r, "Could not set neighbor: %m");
1032 link_enter_failed(link);
1033 return r;
1034 }
1035 }
1036
1037 if (link->neighbor_messages == 0) {
1038 link->neighbors_configured = true;
1039 link_check_ready(link);
1040 } else
1041 log_link_debug(link, "Setting neighbors");
1042
1043 return 0;
1044 }
1045
1046 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1047 int r;
1048
1049 assert(rtnl);
1050 assert(m);
1051 assert(link);
1052 assert(link->ifname);
1053 assert(link->address_messages > 0);
1054 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1055 LINK_STATE_FAILED, LINK_STATE_LINGER));
1056
1057 link->address_messages--;
1058
1059 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1060 return 1;
1061
1062 r = sd_netlink_message_get_errno(m);
1063 if (r < 0 && r != -EEXIST)
1064 log_link_warning_errno(link, r, "could not set address: %m");
1065 else if (r >= 0)
1066 manager_rtnl_process_address(rtnl, m, link->manager);
1067
1068 if (link->address_messages == 0) {
1069 log_link_debug(link, "Addresses set");
1070 link->addresses_configured = true;
1071 link_check_ready(link);
1072 }
1073
1074 return 1;
1075 }
1076
1077 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1078 _cleanup_free_ struct in_addr *addresses = NULL;
1079 size_t n_addresses = 0, n_allocated = 0;
1080 unsigned i;
1081
1082 log_debug("Copying DNS server information from %s", link->ifname);
1083
1084 if (!link->network)
1085 return 0;
1086
1087 for (i = 0; i < link->network->n_dns; i++) {
1088 struct in_addr ia;
1089
1090 /* Only look for IPv4 addresses */
1091 if (link->network->dns[i].family != AF_INET)
1092 continue;
1093
1094 ia = link->network->dns[i].address.in;
1095
1096 /* Never propagate obviously borked data */
1097 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1098 continue;
1099
1100 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1101 return log_oom();
1102
1103 addresses[n_addresses++] = ia;
1104 }
1105
1106 if (link->network->dhcp_use_dns && link->dhcp_lease) {
1107 const struct in_addr *da = NULL;
1108 int j, n;
1109
1110 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
1111 if (n > 0) {
1112
1113 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1114 return log_oom();
1115
1116 for (j = 0; j < n; j++)
1117 if (in4_addr_is_non_local(&da[j]))
1118 addresses[n_addresses++] = da[j];
1119 }
1120 }
1121
1122 if (n_addresses <= 0)
1123 return 0;
1124
1125 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
1126 }
1127
1128 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1129 _cleanup_free_ struct in_addr *addresses = NULL;
1130 size_t n_addresses = 0, n_allocated = 0;
1131 char **a;
1132
1133 if (!link->network)
1134 return 0;
1135
1136 log_debug("Copying NTP server information from %s", link->ifname);
1137
1138 STRV_FOREACH(a, link->network->ntp) {
1139 struct in_addr ia;
1140
1141 /* Only look for IPv4 addresses */
1142 if (inet_pton(AF_INET, *a, &ia) <= 0)
1143 continue;
1144
1145 /* Never propagate obviously borked data */
1146 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1147 continue;
1148
1149 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1150 return log_oom();
1151
1152 addresses[n_addresses++] = ia;
1153 }
1154
1155 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1156 const struct in_addr *da = NULL;
1157 int j, n;
1158
1159 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1160 if (n > 0) {
1161
1162 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1163 return log_oom();
1164
1165 for (j = 0; j < n; j++)
1166 if (in4_addr_is_non_local(&da[j]))
1167 addresses[n_addresses++] = da[j];
1168 }
1169 }
1170
1171 if (n_addresses <= 0)
1172 return 0;
1173
1174 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1175 }
1176
1177 static int link_set_bridge_fdb(Link *link) {
1178 FdbEntry *fdb_entry;
1179 int r;
1180
1181 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1182 r = fdb_entry_configure(link, fdb_entry);
1183 if (r < 0)
1184 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1185 }
1186
1187 return 0;
1188 }
1189
1190 static int link_request_set_addresses(Link *link) {
1191 AddressLabel *label;
1192 Address *ad;
1193 int r;
1194
1195 assert(link);
1196 assert(link->network);
1197 assert(link->state != _LINK_STATE_INVALID);
1198
1199 link_set_state(link, LINK_STATE_CONFIGURING);
1200
1201 /* Reset all *_configured flags we are configuring. */
1202 link->addresses_configured = false;
1203 link->addresses_ready = false;
1204 link->neighbors_configured = false;
1205 link->static_routes_configured = false;
1206 link->routing_policy_rules_configured = false;
1207
1208 r = link_set_bridge_fdb(link);
1209 if (r < 0)
1210 return r;
1211
1212 r = link_request_set_neighbors(link);
1213 if (r < 0)
1214 return r;
1215
1216 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1217 bool update;
1218
1219 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1220
1221 r = address_configure(ad, link, address_handler, update);
1222 if (r < 0) {
1223 log_link_warning_errno(link, r, "Could not set addresses: %m");
1224 link_enter_failed(link);
1225 return r;
1226 }
1227
1228 link->address_messages++;
1229 }
1230
1231 LIST_FOREACH(labels, label, link->network->address_labels) {
1232 r = address_label_configure(label, link, NULL, false);
1233 if (r < 0) {
1234 log_link_warning_errno(link, r, "Could not set address label: %m");
1235 link_enter_failed(link);
1236 return r;
1237 }
1238
1239 link->address_label_messages++;
1240 }
1241
1242 /* now that we can figure out a default address for the dhcp server,
1243 start it */
1244 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1245 Address *address;
1246 Link *uplink = NULL;
1247 bool acquired_uplink = false;
1248
1249 address = link_find_dhcp_server_address(link);
1250 if (!address) {
1251 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1252 link_enter_failed(link);
1253 return 0;
1254 }
1255
1256 /* use the server address' subnet as the pool */
1257 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1258 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1259 if (r < 0)
1260 return r;
1261
1262 /* TODO:
1263 r = sd_dhcp_server_set_router(link->dhcp_server,
1264 &main_address->in_addr.in);
1265 if (r < 0)
1266 return r;
1267 */
1268
1269 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1270 r = sd_dhcp_server_set_max_lease_time(
1271 link->dhcp_server,
1272 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1273 if (r < 0)
1274 return r;
1275 }
1276
1277 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1278 r = sd_dhcp_server_set_default_lease_time(
1279 link->dhcp_server,
1280 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1281 if (r < 0)
1282 return r;
1283 }
1284
1285 if (link->network->dhcp_server_emit_dns) {
1286
1287 if (link->network->n_dhcp_server_dns > 0)
1288 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1289 else {
1290 uplink = manager_find_uplink(link->manager, link);
1291 acquired_uplink = true;
1292
1293 if (!uplink) {
1294 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1295 r = 0;
1296 } else
1297 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1298 }
1299 if (r < 0)
1300 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1301 }
1302
1303 if (link->network->dhcp_server_emit_ntp) {
1304
1305 if (link->network->n_dhcp_server_ntp > 0)
1306 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1307 else {
1308 if (!acquired_uplink)
1309 uplink = manager_find_uplink(link->manager, link);
1310
1311 if (!uplink) {
1312 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1313 r = 0;
1314 } else
1315 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1316
1317 }
1318 if (r < 0)
1319 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1320 }
1321
1322 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1323 if (r < 0)
1324 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1325
1326 if (link->network->dhcp_server_emit_timezone) {
1327 _cleanup_free_ char *buffer = NULL;
1328 const char *tz = NULL;
1329
1330 if (link->network->dhcp_server_timezone)
1331 tz = link->network->dhcp_server_timezone;
1332 else {
1333 r = get_timezone(&buffer);
1334 if (r < 0)
1335 log_warning_errno(r, "Failed to determine timezone: %m");
1336 else
1337 tz = buffer;
1338 }
1339
1340 if (tz) {
1341 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1342 if (r < 0)
1343 return r;
1344 }
1345 }
1346 if (!sd_dhcp_server_is_running(link->dhcp_server)) {
1347 r = sd_dhcp_server_start(link->dhcp_server);
1348 if (r < 0) {
1349 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1350
1351 link_enter_failed(link);
1352
1353 return 0;
1354 }
1355 }
1356
1357 log_link_debug(link, "Offering DHCPv4 leases");
1358 }
1359
1360 if (link->address_messages == 0) {
1361 link->addresses_configured = true;
1362 link_check_ready(link);
1363 } else
1364 log_link_debug(link, "Setting addresses");
1365
1366 return 0;
1367 }
1368
1369 static int link_set_bridge_vlan(Link *link) {
1370 int r = 0;
1371
1372 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1373 if (r < 0)
1374 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1375
1376 return r;
1377 }
1378
1379 static int link_set_proxy_arp(Link *link) {
1380 int r;
1381
1382 if (!link_proxy_arp_enabled(link))
1383 return 0;
1384
1385 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1386 if (r < 0)
1387 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1388
1389 return 0;
1390 }
1391
1392 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1393 int r;
1394
1395 assert(link);
1396
1397 log_link_debug(link, "Set link");
1398
1399 r = sd_netlink_message_get_errno(m);
1400 if (r < 0 && r != -EEXIST) {
1401 log_link_error_errno(link, r, "Could not join netdev: %m");
1402 link_enter_failed(link);
1403 }
1404
1405 return 1;
1406 }
1407
1408 static int link_configure_after_setting_mtu(Link *link);
1409
1410 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1411 int r;
1412
1413 assert(m);
1414 assert(link);
1415 assert(link->ifname);
1416
1417 link->setting_mtu = false;
1418
1419 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1420 return 1;
1421
1422 r = sd_netlink_message_get_errno(m);
1423 if (r < 0) {
1424 log_link_warning_errno(link, r, "Could not set MTU: %m");
1425 return 1;
1426 }
1427
1428 log_link_debug(link, "Setting MTU done.");
1429
1430 if (link->state == LINK_STATE_INITIALIZED)
1431 (void) link_configure_after_setting_mtu(link);
1432
1433 return 1;
1434 }
1435
1436 int link_set_mtu(Link *link, uint32_t mtu, bool force) {
1437 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1438 int r;
1439
1440 assert(link);
1441 assert(link->manager);
1442 assert(link->manager->rtnl);
1443
1444 if (mtu == 0 || link->setting_mtu)
1445 return 0;
1446
1447 if (force ? link->mtu == mtu : link->mtu >= mtu)
1448 return 0;
1449
1450 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1451
1452 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1453 if (r < 0)
1454 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1455
1456 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1457 * for this interface, then disable IPv6 else enable it. */
1458 (void) link_enable_ipv6(link);
1459
1460 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1461 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1462 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1463
1464 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1465 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1466
1467 mtu = IPV6_MIN_MTU;
1468 }
1469
1470 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1471 if (r < 0)
1472 return log_link_error_errno(link, r, "Could not append MTU: %m");
1473
1474 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1475 link_netlink_destroy_callback, link);
1476 if (r < 0)
1477 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1478
1479 link_ref(link);
1480 link->setting_mtu = true;
1481
1482 return 0;
1483 }
1484
1485 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1486 int r;
1487
1488 assert(m);
1489 assert(link);
1490 assert(link->ifname);
1491
1492 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1493 return 1;
1494
1495 r = sd_netlink_message_get_errno(m);
1496 if (r < 0)
1497 log_link_warning_errno(link, r, "Could not set link flags: %m");
1498
1499 return 1;
1500 }
1501
1502 static int link_set_flags(Link *link) {
1503 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1504 unsigned ifi_change = 0;
1505 unsigned ifi_flags = 0;
1506 int r;
1507
1508 assert(link);
1509 assert(link->manager);
1510 assert(link->manager->rtnl);
1511
1512 if (link->flags & IFF_LOOPBACK)
1513 return 0;
1514
1515 if (!link->network)
1516 return 0;
1517
1518 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1519 return 0;
1520
1521 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1522 if (r < 0)
1523 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1524
1525 if (link->network->arp >= 0) {
1526 ifi_change |= IFF_NOARP;
1527 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1528 }
1529
1530 if (link->network->multicast >= 0) {
1531 ifi_change |= IFF_MULTICAST;
1532 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1533 }
1534
1535 if (link->network->allmulticast >= 0) {
1536 ifi_change |= IFF_ALLMULTI;
1537 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1538 }
1539
1540 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1541 if (r < 0)
1542 return log_link_error_errno(link, r, "Could not set link flags: %m");
1543
1544 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1545 link_netlink_destroy_callback, link);
1546 if (r < 0)
1547 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1548
1549 link_ref(link);
1550
1551 return 0;
1552 }
1553
1554 static int link_set_bridge(Link *link) {
1555 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1556 int r;
1557
1558 assert(link);
1559 assert(link->network);
1560
1561 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1562 if (r < 0)
1563 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1564
1565 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1566 if (r < 0)
1567 return log_link_error_errno(link, r, "Could not set message family: %m");
1568
1569 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1570 if (r < 0)
1571 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1572
1573 if (link->network->use_bpdu >= 0) {
1574 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
1575 if (r < 0)
1576 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1577 }
1578
1579 if (link->network->hairpin >= 0) {
1580 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1581 if (r < 0)
1582 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1583 }
1584
1585 if (link->network->fast_leave >= 0) {
1586 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1587 if (r < 0)
1588 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1589 }
1590
1591 if (link->network->allow_port_to_be_root >= 0) {
1592 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
1593 if (r < 0)
1594 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1595
1596 }
1597
1598 if (link->network->unicast_flood >= 0) {
1599 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1600 if (r < 0)
1601 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1602 }
1603
1604 if (link->network->multicast_flood >= 0) {
1605 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_FLOOD, link->network->multicast_flood);
1606 if (r < 0)
1607 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_FLOOD attribute: %m");
1608 }
1609
1610 if (link->network->multicast_to_unicast >= 0) {
1611 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_TO_UCAST, link->network->multicast_to_unicast);
1612 if (r < 0)
1613 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_TO_UCAST attribute: %m");
1614 }
1615
1616 if (link->network->neighbor_suppression >= 0) {
1617 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_NEIGH_SUPPRESS, link->network->neighbor_suppression);
1618 if (r < 0)
1619 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_NEIGH_SUPPRESS attribute: %m");
1620 }
1621
1622 if (link->network->learning >= 0) {
1623 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_LEARNING, link->network->learning);
1624 if (r < 0)
1625 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_LEARNING attribute: %m");
1626 }
1627
1628 if (link->network->cost != 0) {
1629 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1630 if (r < 0)
1631 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1632 }
1633
1634 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1635 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1636 if (r < 0)
1637 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1638 }
1639
1640 r = sd_netlink_message_close_container(req);
1641 if (r < 0)
1642 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1643
1644 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_handler,
1645 link_netlink_destroy_callback, link);
1646 if (r < 0)
1647 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1648
1649 link_ref(link);
1650
1651 return r;
1652 }
1653
1654 static int link_set_bond_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1655 int r;
1656
1657 assert(m);
1658 assert(link);
1659 assert(link->ifname);
1660
1661 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1662 return 1;
1663
1664 r = sd_netlink_message_get_errno(m);
1665 if (r < 0) {
1666 log_link_warning_errno(link, r, "Could not set bonding interface: %m");
1667 return 1;
1668 }
1669
1670 return 1;
1671 }
1672
1673 static int link_set_bond(Link *link) {
1674 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1675 int r;
1676
1677 assert(link);
1678 assert(link->network);
1679
1680 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1681 if (r < 0)
1682 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1683
1684 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1685 if (r < 0)
1686 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1687
1688 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1689 if (r < 0)
1690 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1691
1692 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1693 if (r < 0)
1694 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1695
1696 if (link->network->active_slave) {
1697 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1698 if (r < 0)
1699 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1700 }
1701
1702 if (link->network->primary_slave) {
1703 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1704 if (r < 0)
1705 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1706 }
1707
1708 r = sd_netlink_message_close_container(req);
1709 if (r < 0)
1710 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1711
1712 r = sd_netlink_message_close_container(req);
1713 if (r < 0)
1714 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1715
1716 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_bond_handler,
1717 link_netlink_destroy_callback, link);
1718 if (r < 0)
1719 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1720
1721 link_ref(link);
1722
1723 return r;
1724 }
1725
1726 static int link_lldp_save(Link *link) {
1727 _cleanup_free_ char *temp_path = NULL;
1728 _cleanup_fclose_ FILE *f = NULL;
1729 sd_lldp_neighbor **l = NULL;
1730 int n = 0, r, i;
1731
1732 assert(link);
1733 assert(link->lldp_file);
1734
1735 if (!link->lldp) {
1736 (void) unlink(link->lldp_file);
1737 return 0;
1738 }
1739
1740 r = sd_lldp_get_neighbors(link->lldp, &l);
1741 if (r < 0)
1742 goto finish;
1743 if (r == 0) {
1744 (void) unlink(link->lldp_file);
1745 goto finish;
1746 }
1747
1748 n = r;
1749
1750 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1751 if (r < 0)
1752 goto finish;
1753
1754 fchmod(fileno(f), 0644);
1755
1756 for (i = 0; i < n; i++) {
1757 const void *p;
1758 le64_t u;
1759 size_t sz;
1760
1761 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1762 if (r < 0)
1763 goto finish;
1764
1765 u = htole64(sz);
1766 (void) fwrite(&u, 1, sizeof(u), f);
1767 (void) fwrite(p, 1, sz, f);
1768 }
1769
1770 r = fflush_and_check(f);
1771 if (r < 0)
1772 goto finish;
1773
1774 if (rename(temp_path, link->lldp_file) < 0) {
1775 r = -errno;
1776 goto finish;
1777 }
1778
1779 finish:
1780 if (r < 0) {
1781 (void) unlink(link->lldp_file);
1782 if (temp_path)
1783 (void) unlink(temp_path);
1784
1785 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1786 }
1787
1788 if (l) {
1789 for (i = 0; i < n; i++)
1790 sd_lldp_neighbor_unref(l[i]);
1791 free(l);
1792 }
1793
1794 return r;
1795 }
1796
1797 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1798 Link *link = userdata;
1799 int r;
1800
1801 assert(link);
1802
1803 (void) link_lldp_save(link);
1804
1805 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1806 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1807
1808 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1809
1810 r = link_lldp_emit_start(link);
1811 if (r < 0)
1812 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1813 }
1814 }
1815
1816 static int link_acquire_ipv6_conf(Link *link) {
1817 int r;
1818
1819 assert(link);
1820
1821 if (link_ipv6_accept_ra_enabled(link)) {
1822 assert(link->ndisc);
1823
1824 log_link_debug(link, "Discovering IPv6 routers");
1825
1826 r = sd_ndisc_start(link->ndisc);
1827 if (r < 0 && r != -EBUSY)
1828 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1829 }
1830
1831 if (link_radv_enabled(link)) {
1832 assert(link->radv);
1833 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1834
1835 log_link_debug(link, "Starting IPv6 Router Advertisements");
1836
1837 r = sd_radv_start(link->radv);
1838 if (r < 0 && r != -EBUSY)
1839 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1840 }
1841
1842 (void) dhcp6_request_prefix_delegation(link);
1843
1844 return 0;
1845 }
1846
1847 static int link_acquire_ipv4_conf(Link *link) {
1848 int r;
1849
1850 assert(link);
1851 assert(link->manager);
1852 assert(link->manager->event);
1853
1854 if (link_ipv4ll_enabled(link)) {
1855 assert(link->ipv4ll);
1856
1857 log_link_debug(link, "Acquiring IPv4 link-local address");
1858
1859 r = sd_ipv4ll_start(link->ipv4ll);
1860 if (r < 0)
1861 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1862 }
1863
1864 if (link_dhcp4_enabled(link)) {
1865 assert(link->dhcp_client);
1866
1867 log_link_debug(link, "Acquiring DHCPv4 lease");
1868
1869 r = sd_dhcp_client_start(link->dhcp_client);
1870 if (r < 0)
1871 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1872 }
1873
1874 return 0;
1875 }
1876
1877 static int link_acquire_conf(Link *link) {
1878 int r;
1879
1880 assert(link);
1881
1882 r = link_acquire_ipv4_conf(link);
1883 if (r < 0)
1884 return r;
1885
1886 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1887 r = link_acquire_ipv6_conf(link);
1888 if (r < 0)
1889 return r;
1890 }
1891
1892 if (link_lldp_emit_enabled(link)) {
1893 r = link_lldp_emit_start(link);
1894 if (r < 0)
1895 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1896 }
1897
1898 return 0;
1899 }
1900
1901 bool link_has_carrier(Link *link) {
1902 /* see Documentation/networking/operstates.txt in the kernel sources */
1903
1904 if (link->kernel_operstate == IF_OPER_UP)
1905 return true;
1906
1907 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1908 /* operstate may not be implemented, so fall back to flags */
1909 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1910 return true;
1911
1912 return false;
1913 }
1914
1915 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1916 int r;
1917
1918 assert(link);
1919
1920 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1921 return 1;
1922
1923 r = sd_netlink_message_get_errno(m);
1924 if (r < 0)
1925 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1926
1927 return 1;
1928 }
1929
1930 static int link_configure_addrgen_mode(Link *link) {
1931 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1932 uint8_t ipv6ll_mode;
1933 int r;
1934
1935 assert(link);
1936 assert(link->network);
1937 assert(link->manager);
1938 assert(link->manager->rtnl);
1939
1940 log_link_debug(link, "Setting address genmode for link");
1941
1942 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1943 if (r < 0)
1944 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1945
1946 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1947 if (r < 0)
1948 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1949
1950 r = sd_netlink_message_open_container(req, AF_INET6);
1951 if (r < 0)
1952 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1953
1954 if (!link_ipv6ll_enabled(link))
1955 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1956 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1957 /* The file may not exist. And event if it exists, when stable_secret is unset,
1958 * reading the file fails with EIO. */
1959 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1960 else
1961 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1962
1963 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1964 if (r < 0)
1965 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1966
1967 r = sd_netlink_message_close_container(req);
1968 if (r < 0)
1969 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1970
1971 r = sd_netlink_message_close_container(req);
1972 if (r < 0)
1973 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1974
1975 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1976 link_netlink_destroy_callback, link);
1977 if (r < 0)
1978 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1979
1980 link_ref(link);
1981
1982 return 0;
1983 }
1984
1985 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1986 int r;
1987
1988 assert(link);
1989
1990 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1991 return 1;
1992
1993 r = sd_netlink_message_get_errno(m);
1994 if (r < 0)
1995 /* we warn but don't fail the link, as it may be brought up later */
1996 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1997
1998 return 1;
1999 }
2000
2001 static int link_up(Link *link) {
2002 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2003 int r;
2004
2005 assert(link);
2006 assert(link->network);
2007 assert(link->manager);
2008 assert(link->manager->rtnl);
2009
2010 log_link_debug(link, "Bringing link up");
2011
2012 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2013 if (r < 0)
2014 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2015
2016 /* set it free if not enslaved with networkd */
2017 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
2018 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
2019 if (r < 0)
2020 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
2021 }
2022
2023 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
2024 if (r < 0)
2025 return log_link_error_errno(link, r, "Could not set link flags: %m");
2026
2027 if (link->network->mac) {
2028 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
2029 if (r < 0)
2030 return log_link_error_errno(link, r, "Could not set MAC address: %m");
2031 }
2032
2033 if (link_ipv6_enabled(link)) {
2034 uint8_t ipv6ll_mode;
2035
2036 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
2037 if (r < 0)
2038 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
2039
2040 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
2041 r = sd_netlink_message_open_container(req, AF_INET6);
2042 if (r < 0)
2043 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
2044
2045 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
2046 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
2047 if (r < 0)
2048 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
2049 }
2050
2051 if (!link_ipv6ll_enabled(link))
2052 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
2053 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
2054 /* The file may not exist. And event if it exists, when stable_secret is unset,
2055 * reading the file fails with EIO. */
2056 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
2057 else
2058 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
2059
2060 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
2061 if (r < 0)
2062 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
2063
2064 r = sd_netlink_message_close_container(req);
2065 if (r < 0)
2066 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
2067
2068 r = sd_netlink_message_close_container(req);
2069 if (r < 0)
2070 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
2071 }
2072
2073 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2074 link_netlink_destroy_callback, link);
2075 if (r < 0)
2076 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2077
2078 link_ref(link);
2079
2080 return 0;
2081 }
2082
2083 static int link_up_can(Link *link) {
2084 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2085 int r;
2086
2087 assert(link);
2088
2089 log_link_debug(link, "Bringing CAN link up");
2090
2091 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2092 if (r < 0)
2093 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2094
2095 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
2096 if (r < 0)
2097 return log_link_error_errno(link, r, "Could not set link flags: %m");
2098
2099 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2100 link_netlink_destroy_callback, link);
2101 if (r < 0)
2102 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2103
2104 link_ref(link);
2105
2106 return 0;
2107 }
2108
2109 static int link_set_can(Link *link) {
2110 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
2111 int r;
2112
2113 assert(link);
2114 assert(link->network);
2115 assert(link->manager);
2116 assert(link->manager->rtnl);
2117
2118 log_link_debug(link, "link_set_can");
2119
2120 r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
2121 if (r < 0)
2122 return log_link_error_errno(link, r, "Failed to allocate netlink message: %m");
2123
2124 r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
2125 if (r < 0)
2126 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
2127
2128 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
2129 if (r < 0)
2130 return log_link_error_errno(link, r, "Failed to open netlink container: %m");
2131
2132 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
2133 if (r < 0)
2134 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
2135
2136 if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) {
2137 struct can_bittiming bt = {
2138 .bitrate = link->network->can_bitrate,
2139 .sample_point = link->network->can_sample_point,
2140 };
2141
2142 if (link->network->can_bitrate > UINT32_MAX) {
2143 log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate);
2144 return -ERANGE;
2145 }
2146
2147 log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate);
2148 if (link->network->can_sample_point > 0)
2149 log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
2150 else
2151 log_link_debug(link, "Using default sample point");
2152
2153 r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
2154 if (r < 0)
2155 return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
2156 }
2157
2158 if (link->network->can_restart_us > 0) {
2159 char time_string[FORMAT_TIMESPAN_MAX];
2160 uint64_t restart_ms;
2161
2162 if (link->network->can_restart_us == USEC_INFINITY)
2163 restart_ms = 0;
2164 else
2165 restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC);
2166
2167 format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC);
2168
2169 if (restart_ms > UINT32_MAX) {
2170 log_link_error(link, "restart timeout (%s) too big.", time_string);
2171 return -ERANGE;
2172 }
2173
2174 log_link_debug(link, "Setting restart = %s", time_string);
2175
2176 r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
2177 if (r < 0)
2178 return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
2179 }
2180
2181 if (link->network->can_triple_sampling >= 0) {
2182 struct can_ctrlmode cm = {
2183 .mask = CAN_CTRLMODE_3_SAMPLES,
2184 .flags = link->network->can_triple_sampling ? CAN_CTRLMODE_3_SAMPLES : 0,
2185 };
2186
2187 log_link_debug(link, "%sabling triple-sampling", link->network->can_triple_sampling ? "En" : "Dis");
2188
2189 r = sd_netlink_message_append_data(m, IFLA_CAN_CTRLMODE, &cm, sizeof(cm));
2190 if (r < 0)
2191 return log_link_error_errno(link, r, "Could not append IFLA_CAN_CTRLMODE attribute: %m");
2192 }
2193
2194 r = sd_netlink_message_close_container(m);
2195 if (r < 0)
2196 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2197
2198 r = sd_netlink_message_close_container(m);
2199 if (r < 0)
2200 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2201
2202 r = netlink_call_async(link->manager->rtnl, NULL, m, link_set_handler,
2203 link_netlink_destroy_callback, link);
2204 if (r < 0)
2205 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2206
2207 link_ref(link);
2208
2209 if (!(link->flags & IFF_UP)) {
2210 r = link_up_can(link);
2211 if (r < 0) {
2212 link_enter_failed(link);
2213 return r;
2214 }
2215 }
2216
2217 log_link_debug(link, "link_set_can done");
2218
2219 return r;
2220 }
2221
2222 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2223 int r;
2224
2225 assert(link);
2226
2227 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2228 return 1;
2229
2230 r = sd_netlink_message_get_errno(m);
2231 if (r < 0)
2232 log_link_warning_errno(link, r, "Could not bring down interface: %m");
2233
2234 if (streq_ptr(link->kind, "can"))
2235 link_set_can(link);
2236
2237 return 1;
2238 }
2239
2240 int link_down(Link *link) {
2241 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2242 int r;
2243
2244 assert(link);
2245 assert(link->manager);
2246 assert(link->manager->rtnl);
2247
2248 log_link_debug(link, "Bringing link down");
2249
2250 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
2251 RTM_SETLINK, link->ifindex);
2252 if (r < 0)
2253 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2254
2255 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
2256 if (r < 0)
2257 return log_link_error_errno(link, r, "Could not set link flags: %m");
2258
2259 r = netlink_call_async(link->manager->rtnl, NULL, req, link_down_handler,
2260 link_netlink_destroy_callback, link);
2261 if (r < 0)
2262 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2263
2264 link_ref(link);
2265
2266 return 0;
2267 }
2268
2269 static int link_handle_bound_to_list(Link *link) {
2270 Link *l;
2271 Iterator i;
2272 int r;
2273 bool required_up = false;
2274 bool link_is_up = false;
2275
2276 assert(link);
2277
2278 if (hashmap_isempty(link->bound_to_links))
2279 return 0;
2280
2281 if (link->flags & IFF_UP)
2282 link_is_up = true;
2283
2284 HASHMAP_FOREACH (l, link->bound_to_links, i)
2285 if (link_has_carrier(l)) {
2286 required_up = true;
2287 break;
2288 }
2289
2290 if (!required_up && link_is_up) {
2291 r = link_down(link);
2292 if (r < 0)
2293 return r;
2294 } else if (required_up && !link_is_up) {
2295 r = link_up(link);
2296 if (r < 0)
2297 return r;
2298 }
2299
2300 return 0;
2301 }
2302
2303 static int link_handle_bound_by_list(Link *link) {
2304 Iterator i;
2305 Link *l;
2306 int r;
2307
2308 assert(link);
2309
2310 if (hashmap_isempty(link->bound_by_links))
2311 return 0;
2312
2313 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2314 r = link_handle_bound_to_list(l);
2315 if (r < 0)
2316 return r;
2317 }
2318
2319 return 0;
2320 }
2321
2322 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2323 int r;
2324
2325 assert(link);
2326 assert(carrier);
2327
2328 if (link == carrier)
2329 return 0;
2330
2331 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2332 return 0;
2333
2334 r = hashmap_ensure_allocated(h, NULL);
2335 if (r < 0)
2336 return r;
2337
2338 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2339 if (r < 0)
2340 return r;
2341
2342 return 0;
2343 }
2344
2345 static int link_new_bound_by_list(Link *link) {
2346 Manager *m;
2347 Link *carrier;
2348 Iterator i;
2349 int r;
2350 bool list_updated = false;
2351
2352 assert(link);
2353 assert(link->manager);
2354
2355 m = link->manager;
2356
2357 HASHMAP_FOREACH(carrier, m->links, i) {
2358 if (!carrier->network)
2359 continue;
2360
2361 if (strv_isempty(carrier->network->bind_carrier))
2362 continue;
2363
2364 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2365 r = link_put_carrier(link, carrier, &link->bound_by_links);
2366 if (r < 0)
2367 return r;
2368
2369 list_updated = true;
2370 }
2371 }
2372
2373 if (list_updated)
2374 link_dirty(link);
2375
2376 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2377 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2378 if (r < 0)
2379 return r;
2380
2381 link_dirty(carrier);
2382 }
2383
2384 return 0;
2385 }
2386
2387 static int link_new_bound_to_list(Link *link) {
2388 Manager *m;
2389 Link *carrier;
2390 Iterator i;
2391 int r;
2392 bool list_updated = false;
2393
2394 assert(link);
2395 assert(link->manager);
2396
2397 if (!link->network)
2398 return 0;
2399
2400 if (strv_isempty(link->network->bind_carrier))
2401 return 0;
2402
2403 m = link->manager;
2404
2405 HASHMAP_FOREACH (carrier, m->links, i) {
2406 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2407 r = link_put_carrier(link, carrier, &link->bound_to_links);
2408 if (r < 0)
2409 return r;
2410
2411 list_updated = true;
2412 }
2413 }
2414
2415 if (list_updated)
2416 link_dirty(link);
2417
2418 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2419 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2420 if (r < 0)
2421 return r;
2422
2423 link_dirty(carrier);
2424 }
2425
2426 return 0;
2427 }
2428
2429 static int link_new_carrier_maps(Link *link) {
2430 int r;
2431
2432 r = link_new_bound_by_list(link);
2433 if (r < 0)
2434 return r;
2435
2436 r = link_handle_bound_by_list(link);
2437 if (r < 0)
2438 return r;
2439
2440 r = link_new_bound_to_list(link);
2441 if (r < 0)
2442 return r;
2443
2444 r = link_handle_bound_to_list(link);
2445 if (r < 0)
2446 return r;
2447
2448 return 0;
2449 }
2450
2451 static void link_free_bound_to_list(Link *link) {
2452 Link *bound_to;
2453 Iterator i;
2454
2455 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2456 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2457
2458 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2459 link_dirty(bound_to);
2460 }
2461
2462 return;
2463 }
2464
2465 static void link_free_bound_by_list(Link *link) {
2466 Link *bound_by;
2467 Iterator i;
2468
2469 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2470 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2471
2472 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2473 link_dirty(bound_by);
2474 link_handle_bound_to_list(bound_by);
2475 }
2476 }
2477
2478 return;
2479 }
2480
2481 static void link_free_carrier_maps(Link *link) {
2482 bool list_updated = false;
2483
2484 assert(link);
2485
2486 if (!hashmap_isempty(link->bound_to_links)) {
2487 link_free_bound_to_list(link);
2488 list_updated = true;
2489 }
2490
2491 if (!hashmap_isempty(link->bound_by_links)) {
2492 link_free_bound_by_list(link);
2493 list_updated = true;
2494 }
2495
2496 if (list_updated)
2497 link_dirty(link);
2498
2499 return;
2500 }
2501
2502 static int link_append_to_master(Link *link, NetDev *netdev) {
2503 Link *master;
2504 int r;
2505
2506 assert(link);
2507 assert(netdev);
2508
2509 r = link_get(link->manager, netdev->ifindex, &master);
2510 if (r < 0)
2511 return r;
2512
2513 r = set_ensure_allocated(&master->slaves, NULL);
2514 if (r < 0)
2515 return r;
2516
2517 r = set_put(master->slaves, link);
2518 if (r < 0)
2519 return r;
2520
2521 link_ref(link);
2522 return 0;
2523 }
2524
2525 static void link_drop_from_master(Link *link, NetDev *netdev) {
2526 Link *master;
2527
2528 assert(link);
2529
2530 if (!link->manager || !netdev)
2531 return;
2532
2533 if (link_get(link->manager, netdev->ifindex, &master) < 0)
2534 return;
2535
2536 link_unref(set_remove(master->slaves, link));
2537 }
2538
2539 static void link_detach_from_manager(Link *link) {
2540 if (!link || !link->manager)
2541 return;
2542
2543 link_unref(set_remove(link->manager->links_requesting_uuid, link));
2544 link_clean(link);
2545
2546 /* The following must be called at last. */
2547 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2548 link_unref(link);
2549 }
2550
2551 void link_drop(Link *link) {
2552 if (!link || link->state == LINK_STATE_LINGER)
2553 return;
2554
2555 link_set_state(link, LINK_STATE_LINGER);
2556
2557 link_free_carrier_maps(link);
2558
2559 if (link->network) {
2560 link_drop_from_master(link, link->network->bridge);
2561 link_drop_from_master(link, link->network->bond);
2562 }
2563
2564 log_link_debug(link, "Link removed");
2565
2566 (void) unlink(link->state_file);
2567 link_detach_from_manager(link);
2568 }
2569
2570 static int link_joined(Link *link) {
2571 int r;
2572
2573 assert(link);
2574 assert(link->network);
2575
2576 if (!hashmap_isempty(link->bound_to_links)) {
2577 r = link_handle_bound_to_list(link);
2578 if (r < 0)
2579 return r;
2580 } else if (!(link->flags & IFF_UP)) {
2581 r = link_up(link);
2582 if (r < 0) {
2583 link_enter_failed(link);
2584 return r;
2585 }
2586 }
2587
2588 if (link->network->bridge) {
2589 r = link_set_bridge(link);
2590 if (r < 0)
2591 log_link_error_errno(link, r, "Could not set bridge message: %m");
2592
2593 r = link_append_to_master(link, link->network->bridge);
2594 if (r < 0)
2595 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2596 }
2597
2598 if (link->network->bond) {
2599 r = link_set_bond(link);
2600 if (r < 0)
2601 log_link_error_errno(link, r, "Could not set bond message: %m");
2602
2603 r = link_append_to_master(link, link->network->bond);
2604 if (r < 0)
2605 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2606 }
2607
2608 if (link->network->use_br_vlan &&
2609 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2610 r = link_set_bridge_vlan(link);
2611 if (r < 0)
2612 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2613 }
2614
2615 /* Skip setting up addresses until it gets carrier,
2616 or it would try to set addresses twice,
2617 which is bad for non-idempotent steps. */
2618 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2619 return 0;
2620
2621 return link_request_set_addresses(link);
2622 }
2623
2624 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2625 int r;
2626
2627 assert(link);
2628 assert(link->network);
2629 assert(link->enslaving > 0);
2630 assert(!link->enslaved_raw);
2631
2632 link->enslaving--;
2633
2634 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2635 return 1;
2636
2637 r = sd_netlink_message_get_errno(m);
2638 if (r < 0 && r != -EEXIST) {
2639 log_link_error_errno(link, r, "Could not join netdev: %m");
2640 link_enter_failed(link);
2641 return 1;
2642 } else
2643 log_link_debug(link, "Joined netdev");
2644
2645 if (link->enslaving == 0) {
2646 link->enslaved_raw = true;
2647 link_joined(link);
2648 }
2649
2650 return 1;
2651 }
2652
2653 static int link_enter_join_netdev(Link *link) {
2654 NetDev *netdev;
2655 Iterator i;
2656 int r;
2657
2658 assert(link);
2659 assert(link->network);
2660 assert(link->state == LINK_STATE_INITIALIZED);
2661
2662 link_set_state(link, LINK_STATE_CONFIGURING);
2663
2664 link_dirty(link);
2665 link->enslaving = 0;
2666 link->enslaved_raw = false;
2667
2668 if (link->network->bond) {
2669 if (link->network->bond->state == NETDEV_STATE_READY &&
2670 link->network->bond->ifindex == link->master_ifindex)
2671 return link_joined(link);
2672
2673 log_struct(LOG_DEBUG,
2674 LOG_LINK_INTERFACE(link),
2675 LOG_NETDEV_INTERFACE(link->network->bond),
2676 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2677
2678 link->enslaving++;
2679
2680 r = netdev_join(link->network->bond, link, netdev_join_handler);
2681 if (r < 0) {
2682 log_struct_errno(LOG_WARNING, r,
2683 LOG_LINK_INTERFACE(link),
2684 LOG_NETDEV_INTERFACE(link->network->bond),
2685 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2686 link_enter_failed(link);
2687 return r;
2688 }
2689 }
2690
2691 if (link->network->bridge) {
2692 log_struct(LOG_DEBUG,
2693 LOG_LINK_INTERFACE(link),
2694 LOG_NETDEV_INTERFACE(link->network->bridge),
2695 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2696
2697 link->enslaving++;
2698
2699 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2700 if (r < 0) {
2701 log_struct_errno(LOG_WARNING, r,
2702 LOG_LINK_INTERFACE(link),
2703 LOG_NETDEV_INTERFACE(link->network->bridge),
2704 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2705 link_enter_failed(link);
2706 return r;
2707 }
2708 }
2709
2710 if (link->network->vrf) {
2711 log_struct(LOG_DEBUG,
2712 LOG_LINK_INTERFACE(link),
2713 LOG_NETDEV_INTERFACE(link->network->vrf),
2714 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2715
2716 link->enslaving++;
2717
2718 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2719 if (r < 0) {
2720 log_struct_errno(LOG_WARNING, r,
2721 LOG_LINK_INTERFACE(link),
2722 LOG_NETDEV_INTERFACE(link->network->vrf),
2723 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2724 link_enter_failed(link);
2725 return r;
2726 }
2727 }
2728
2729 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2730
2731 if (netdev->ifindex > 0)
2732 /* Assume already enslaved. */
2733 continue;
2734
2735 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2736 continue;
2737
2738 log_struct(LOG_DEBUG,
2739 LOG_LINK_INTERFACE(link),
2740 LOG_NETDEV_INTERFACE(netdev),
2741 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2742
2743 link->enslaving++;
2744
2745 r = netdev_join(netdev, link, netdev_join_handler);
2746 if (r < 0) {
2747 log_struct_errno(LOG_WARNING, r,
2748 LOG_LINK_INTERFACE(link),
2749 LOG_NETDEV_INTERFACE(netdev),
2750 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2751 link_enter_failed(link);
2752 return r;
2753 }
2754 }
2755
2756 if (link->enslaving == 0)
2757 return link_joined(link);
2758
2759 return 0;
2760 }
2761
2762 static int link_set_ipv4_forward(Link *link) {
2763 int r;
2764
2765 if (!link_ipv4_forward_enabled(link))
2766 return 0;
2767
2768 /* We propagate the forwarding flag from one interface to the
2769 * global setting one way. This means: as long as at least one
2770 * interface was configured at any time that had IP forwarding
2771 * enabled the setting will stay on for good. We do this
2772 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2773 * somewhat in sync (see below). */
2774
2775 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2776 if (r < 0)
2777 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2778
2779 return 0;
2780 }
2781
2782 static int link_set_ipv6_forward(Link *link) {
2783 int r;
2784
2785 if (!link_ipv6_forward_enabled(link))
2786 return 0;
2787
2788 /* On Linux, the IPv6 stack does not know a per-interface
2789 * packet forwarding setting: either packet forwarding is on
2790 * for all, or off for all. We hence don't bother with a
2791 * per-interface setting, but simply propagate the interface
2792 * flag, if it is set, to the global flag, one-way. Note that
2793 * while IPv4 would allow a per-interface flag, we expose the
2794 * same behaviour there and also propagate the setting from
2795 * one to all, to keep things simple (see above). */
2796
2797 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2798 if (r < 0)
2799 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2800
2801 return 0;
2802 }
2803
2804 static int link_set_ipv6_privacy_extensions(Link *link) {
2805 IPv6PrivacyExtensions s;
2806 int r;
2807
2808 s = link_ipv6_privacy_extensions(link);
2809 if (s < 0)
2810 return 0;
2811
2812 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2813 if (r < 0)
2814 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2815
2816 return 0;
2817 }
2818
2819 static int link_set_ipv6_accept_ra(Link *link) {
2820 int r;
2821
2822 /* Make this a NOP if IPv6 is not available */
2823 if (!socket_ipv6_is_supported())
2824 return 0;
2825
2826 if (link->flags & IFF_LOOPBACK)
2827 return 0;
2828
2829 if (!link->network)
2830 return 0;
2831
2832 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2833 if (r < 0)
2834 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2835
2836 return 0;
2837 }
2838
2839 static int link_set_ipv6_dad_transmits(Link *link) {
2840 int r;
2841
2842 /* Make this a NOP if IPv6 is not available */
2843 if (!socket_ipv6_is_supported())
2844 return 0;
2845
2846 if (link->flags & IFF_LOOPBACK)
2847 return 0;
2848
2849 if (!link->network)
2850 return 0;
2851
2852 if (link->network->ipv6_dad_transmits < 0)
2853 return 0;
2854
2855 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2856 if (r < 0)
2857 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2858
2859 return 0;
2860 }
2861
2862 static int link_set_ipv6_hop_limit(Link *link) {
2863 int r;
2864
2865 /* Make this a NOP if IPv6 is not available */
2866 if (!socket_ipv6_is_supported())
2867 return 0;
2868
2869 if (link->flags & IFF_LOOPBACK)
2870 return 0;
2871
2872 if (!link->network)
2873 return 0;
2874
2875 if (link->network->ipv6_hop_limit < 0)
2876 return 0;
2877
2878 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2879 if (r < 0)
2880 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2881
2882 return 0;
2883 }
2884
2885 static int link_set_ipv6_mtu(Link *link) {
2886 int r;
2887
2888 /* Make this a NOP if IPv6 is not available */
2889 if (!socket_ipv6_is_supported())
2890 return 0;
2891
2892 if (link->flags & IFF_LOOPBACK)
2893 return 0;
2894
2895 if (link->network->ipv6_mtu == 0)
2896 return 0;
2897
2898 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2899 if (r < 0)
2900 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2901
2902 return 0;
2903 }
2904
2905 static bool link_is_static_address_configured(Link *link, Address *address) {
2906 Address *net_address;
2907
2908 assert(link);
2909 assert(address);
2910
2911 if (!link->network)
2912 return false;
2913
2914 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2915 if (address_equal(net_address, address))
2916 return true;
2917
2918 return false;
2919 }
2920
2921 static bool link_is_static_route_configured(Link *link, Route *route) {
2922 Route *net_route;
2923
2924 assert(link);
2925 assert(route);
2926
2927 if (!link->network)
2928 return false;
2929
2930 LIST_FOREACH(routes, net_route, link->network->static_routes)
2931 if (route_equal(net_route, route))
2932 return true;
2933
2934 return false;
2935 }
2936
2937 static int link_drop_foreign_config(Link *link) {
2938 Address *address;
2939 Route *route;
2940 Iterator i;
2941 int r;
2942
2943 SET_FOREACH(address, link->addresses_foreign, i) {
2944 /* we consider IPv6LL addresses to be managed by the kernel */
2945 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2946 continue;
2947
2948 if (link_is_static_address_configured(link, address)) {
2949 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2950 if (r < 0)
2951 return log_link_error_errno(link, r, "Failed to add address: %m");
2952 } else {
2953 r = address_remove(address, link, NULL);
2954 if (r < 0)
2955 return r;
2956 }
2957 }
2958
2959 SET_FOREACH(route, link->routes_foreign, i) {
2960 /* do not touch routes managed by the kernel */
2961 if (route->protocol == RTPROT_KERNEL)
2962 continue;
2963
2964 if (link_is_static_route_configured(link, route)) {
2965 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2966 if (r < 0)
2967 return r;
2968 } else {
2969 r = route_remove(route, link, NULL);
2970 if (r < 0)
2971 return r;
2972 }
2973 }
2974
2975 return 0;
2976 }
2977
2978 static int link_drop_config(Link *link) {
2979 Address *address, *pool_address;
2980 Route *route;
2981 Iterator i;
2982 int r;
2983
2984 SET_FOREACH(address, link->addresses, i) {
2985 /* we consider IPv6LL addresses to be managed by the kernel */
2986 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2987 continue;
2988
2989 r = address_remove(address, link, NULL);
2990 if (r < 0)
2991 return r;
2992
2993 /* If this address came from an address pool, clean up the pool */
2994 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2995 if (address_equal(address, pool_address)) {
2996 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2997 address_free(pool_address);
2998 break;
2999 }
3000 }
3001 }
3002
3003 SET_FOREACH(route, link->routes, i) {
3004 /* do not touch routes managed by the kernel */
3005 if (route->protocol == RTPROT_KERNEL)
3006 continue;
3007
3008 r = route_remove(route, link, NULL);
3009 if (r < 0)
3010 return r;
3011 }
3012
3013 ndisc_flush(link);
3014
3015 return 0;
3016 }
3017
3018 static int link_update_lldp(Link *link) {
3019 int r;
3020
3021 assert(link);
3022
3023 if (!link->lldp)
3024 return 0;
3025
3026 if (link->flags & IFF_UP) {
3027 r = sd_lldp_start(link->lldp);
3028 if (r > 0)
3029 log_link_debug(link, "Started LLDP.");
3030 } else {
3031 r = sd_lldp_stop(link->lldp);
3032 if (r > 0)
3033 log_link_debug(link, "Stopped LLDP.");
3034 }
3035
3036 return r;
3037 }
3038
3039 static int link_configure_can(Link *link) {
3040 int r;
3041
3042 if (streq_ptr(link->kind, "can")) {
3043 /* The CAN interface must be down to configure bitrate, etc... */
3044 if ((link->flags & IFF_UP)) {
3045 r = link_down(link);
3046 if (r < 0) {
3047 link_enter_failed(link);
3048 return r;
3049 }
3050
3051 return 0;
3052 }
3053
3054 return link_set_can(link);
3055 }
3056
3057 if (!(link->flags & IFF_UP)) {
3058 r = link_up_can(link);
3059 if (r < 0) {
3060 link_enter_failed(link);
3061 return r;
3062 }
3063 }
3064
3065 return 0;
3066 }
3067
3068 static int link_configure(Link *link) {
3069 int r;
3070
3071 assert(link);
3072 assert(link->network);
3073 assert(link->state == LINK_STATE_INITIALIZED);
3074
3075 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
3076 return link_configure_can(link);
3077
3078 /* Drop foreign config, but ignore loopback or critical devices.
3079 * We do not want to remove loopback address or addresses used for root NFS. */
3080 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
3081 r = link_drop_foreign_config(link);
3082 if (r < 0)
3083 return r;
3084 }
3085
3086 r = link_set_proxy_arp(link);
3087 if (r < 0)
3088 return r;
3089
3090 r = ipv6_proxy_ndp_addresses_configure(link);
3091 if (r < 0)
3092 return r;
3093
3094 r = link_set_ipv4_forward(link);
3095 if (r < 0)
3096 return r;
3097
3098 r = link_set_ipv6_forward(link);
3099 if (r < 0)
3100 return r;
3101
3102 r = link_set_ipv6_privacy_extensions(link);
3103 if (r < 0)
3104 return r;
3105
3106 r = link_set_ipv6_accept_ra(link);
3107 if (r < 0)
3108 return r;
3109
3110 r = link_set_ipv6_dad_transmits(link);
3111 if (r < 0)
3112 return r;
3113
3114 r = link_set_ipv6_hop_limit(link);
3115 if (r < 0)
3116 return r;
3117
3118 r = link_set_flags(link);
3119 if (r < 0)
3120 return r;
3121
3122 r = link_set_ipv6_mtu(link);
3123 if (r < 0)
3124 return r;
3125
3126 if (link_ipv4ll_enabled(link) || link_ipv4ll_fallback_enabled(link)) {
3127 r = ipv4ll_configure(link);
3128 if (r < 0)
3129 return r;
3130 }
3131
3132 if (link_dhcp4_enabled(link)) {
3133 r = dhcp4_set_promote_secondaries(link);
3134 if (r < 0)
3135 return r;
3136
3137 r = dhcp4_configure(link);
3138 if (r < 0)
3139 return r;
3140 }
3141
3142 if (link_dhcp4_server_enabled(link)) {
3143 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
3144 if (r < 0)
3145 return r;
3146
3147 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
3148 if (r < 0)
3149 return r;
3150 }
3151
3152 if (link_dhcp6_enabled(link) ||
3153 link_ipv6_accept_ra_enabled(link)) {
3154 r = dhcp6_configure(link);
3155 if (r < 0)
3156 return r;
3157 }
3158
3159 if (link_ipv6_accept_ra_enabled(link)) {
3160 r = ndisc_configure(link);
3161 if (r < 0)
3162 return r;
3163 }
3164
3165 if (link_radv_enabled(link)) {
3166 r = radv_configure(link);
3167 if (r < 0)
3168 return r;
3169 }
3170
3171 if (link_lldp_rx_enabled(link)) {
3172 r = sd_lldp_new(&link->lldp);
3173 if (r < 0)
3174 return r;
3175
3176 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
3177 if (r < 0)
3178 return r;
3179
3180 r = sd_lldp_match_capabilities(link->lldp,
3181 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
3182 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
3183 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
3184 if (r < 0)
3185 return r;
3186
3187 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
3188 if (r < 0)
3189 return r;
3190
3191 r = sd_lldp_attach_event(link->lldp, NULL, 0);
3192 if (r < 0)
3193 return r;
3194
3195 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
3196 if (r < 0)
3197 return r;
3198
3199 r = link_update_lldp(link);
3200 if (r < 0)
3201 return r;
3202 }
3203
3204 r = link_set_mtu(link, link->network->mtu, link->network->mtu_is_set);
3205 if (r < 0)
3206 return r;
3207
3208 if (socket_ipv6_is_supported()) {
3209 r = link_configure_addrgen_mode(link);
3210 if (r < 0)
3211 return r;
3212 }
3213
3214 return link_configure_after_setting_mtu(link);
3215 }
3216
3217 static int link_configure_after_setting_mtu(Link *link) {
3218 int r;
3219
3220 assert(link);
3221 assert(link->network);
3222 assert(link->state == LINK_STATE_INITIALIZED);
3223
3224 if (link->setting_mtu)
3225 return 0;
3226
3227 if (link_has_carrier(link) || link->network->configure_without_carrier) {
3228 r = link_acquire_conf(link);
3229 if (r < 0)
3230 return r;
3231 }
3232
3233 return link_enter_join_netdev(link);
3234 }
3235
3236 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3237 assert(duid);
3238
3239 if (duid->raw_data_len > 0)
3240 return 0;
3241
3242 if (duid->type != DUID_TYPE_UUID)
3243 return -EINVAL;
3244
3245 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3246 duid->raw_data_len = sizeof(sd_id128_t);
3247
3248 return 1;
3249 }
3250
3251 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3252 Manager *manager = userdata;
3253 const sd_bus_error *e;
3254 const void *a;
3255 size_t sz;
3256 DUID *duid;
3257 Link *link;
3258 int r;
3259
3260 assert(m);
3261 assert(manager);
3262
3263 e = sd_bus_message_get_error(m);
3264 if (e) {
3265 log_error_errno(sd_bus_error_get_errno(e),
3266 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3267 e->message);
3268 goto configure;
3269 }
3270
3271 r = sd_bus_message_read_array(m, 'y', &a, &sz);
3272 if (r < 0)
3273 goto configure;
3274
3275 if (sz != sizeof(sd_id128_t)) {
3276 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3277 goto configure;
3278 }
3279
3280 memcpy(&manager->product_uuid, a, sz);
3281 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3282 (void) duid_set_uuid(duid, manager->product_uuid);
3283
3284 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3285
3286 configure:
3287 while ((link = set_steal_first(manager->links_requesting_uuid))) {
3288 r = link_configure(link);
3289 if (r < 0)
3290 log_link_error_errno(link, r, "Failed to configure link: %m");
3291 }
3292
3293 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3294
3295 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3296 * even if the method fails. */
3297 manager->has_product_uuid = true;
3298
3299 return 1;
3300 }
3301
3302 static bool link_requires_uuid(Link *link) {
3303 const DUID *duid;
3304
3305 assert(link);
3306 assert(link->manager);
3307 assert(link->network);
3308
3309 duid = link_get_duid(link);
3310 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3311 return false;
3312
3313 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3314 return true;
3315
3316 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3317 return true;
3318
3319 return false;
3320 }
3321
3322 static int link_configure_duid(Link *link) {
3323 Manager *m;
3324 DUID *duid;
3325 int r;
3326
3327 assert(link);
3328 assert(link->manager);
3329 assert(link->network);
3330
3331 m = link->manager;
3332 duid = link_get_duid(link);
3333
3334 if (!link_requires_uuid(link))
3335 return 1;
3336
3337 if (m->has_product_uuid) {
3338 (void) duid_set_uuid(duid, m->product_uuid);
3339 return 1;
3340 }
3341
3342 if (!m->links_requesting_uuid) {
3343 r = manager_request_product_uuid(m, link);
3344 if (r < 0) {
3345 if (r == -ENOMEM)
3346 return r;
3347
3348 log_link_warning_errno(link, r,
3349 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3350 return 1;
3351 }
3352 } else {
3353 r = set_put(m->links_requesting_uuid, link);
3354 if (r < 0)
3355 return log_oom();
3356
3357 r = set_put(m->duids_requesting_uuid, duid);
3358 if (r < 0)
3359 return log_oom();
3360 }
3361
3362 return 0;
3363 }
3364
3365 static int link_initialized_and_synced(Link *link) {
3366 Network *network;
3367 int r;
3368
3369 assert(link);
3370 assert(link->ifname);
3371 assert(link->manager);
3372
3373 /* We may get called either from the asynchronous netlink callback,
3374 * or directly for link_add() if running in a container. See link_add(). */
3375 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3376 return 0;
3377
3378 log_link_debug(link, "Link state is up-to-date");
3379 link_set_state(link, LINK_STATE_INITIALIZED);
3380
3381 r = link_new_bound_by_list(link);
3382 if (r < 0)
3383 return r;
3384
3385 r = link_handle_bound_by_list(link);
3386 if (r < 0)
3387 return r;
3388
3389 if (!link->network) {
3390 r = network_get(link->manager, link->sd_device, link->ifname,
3391 &link->mac, &network);
3392 if (r == -ENOENT) {
3393 link_enter_unmanaged(link);
3394 return 0;
3395 } else if (r == 0 && network->unmanaged) {
3396 link_enter_unmanaged(link);
3397 return 0;
3398 } else if (r < 0)
3399 return r;
3400
3401 if (link->flags & IFF_LOOPBACK) {
3402 if (network->link_local != ADDRESS_FAMILY_NO)
3403 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3404
3405 if (network->dhcp != ADDRESS_FAMILY_NO)
3406 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3407
3408 if (network->dhcp_server)
3409 log_link_debug(link, "Ignoring DHCP server for loopback link");
3410 }
3411
3412 r = network_apply(network, link);
3413 if (r < 0)
3414 return r;
3415 }
3416
3417 r = link_new_bound_to_list(link);
3418 if (r < 0)
3419 return r;
3420
3421 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3422 * link_configure() is called later asynchronously. */
3423 r = link_configure_duid(link);
3424 if (r <= 0)
3425 return r;
3426
3427 r = link_configure(link);
3428 if (r < 0)
3429 return r;
3430
3431 return 0;
3432 }
3433
3434 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3435 (void) link_initialized_and_synced(link);
3436 return 1;
3437 }
3438
3439 int link_initialized(Link *link, sd_device *device) {
3440 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3441 int r;
3442
3443 assert(link);
3444 assert(link->manager);
3445 assert(link->manager->rtnl);
3446 assert(device);
3447
3448 if (link->state != LINK_STATE_PENDING)
3449 return 0;
3450
3451 if (link->sd_device)
3452 return 0;
3453
3454 log_link_debug(link, "udev initialized link");
3455 link_set_state(link, LINK_STATE_INITIALIZED);
3456
3457 link->sd_device = sd_device_ref(device);
3458
3459 /* udev has initialized the link, but we don't know if we have yet
3460 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3461 * when it returns we know that the pending NEWLINKs have already been
3462 * processed and that we are up-to-date */
3463
3464 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3465 link->ifindex);
3466 if (r < 0)
3467 return r;
3468
3469 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3470 link_netlink_destroy_callback, link);
3471 if (r < 0)
3472 return r;
3473
3474 link_ref(link);
3475
3476 return 0;
3477 }
3478
3479 static int link_load(Link *link) {
3480 _cleanup_free_ char *network_file = NULL,
3481 *addresses = NULL,
3482 *routes = NULL,
3483 *dhcp4_address = NULL,
3484 *ipv4ll_address = NULL;
3485 union in_addr_union address;
3486 union in_addr_union route_dst;
3487 const char *p;
3488 int r;
3489
3490 assert(link);
3491
3492 r = parse_env_file(NULL, link->state_file,
3493 "NETWORK_FILE", &network_file,
3494 "ADDRESSES", &addresses,
3495 "ROUTES", &routes,
3496 "DHCP4_ADDRESS", &dhcp4_address,
3497 "IPV4LL_ADDRESS", &ipv4ll_address);
3498 if (r < 0 && r != -ENOENT)
3499 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3500
3501 if (network_file) {
3502 Network *network;
3503 char *suffix;
3504
3505 /* drop suffix */
3506 suffix = strrchr(network_file, '.');
3507 if (!suffix) {
3508 log_link_debug(link, "Failed to get network name from %s", network_file);
3509 goto network_file_fail;
3510 }
3511 *suffix = '\0';
3512
3513 r = network_get_by_name(link->manager, basename(network_file), &network);
3514 if (r < 0) {
3515 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3516 goto network_file_fail;
3517 }
3518
3519 r = network_apply(network, link);
3520 if (r < 0)
3521 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3522 }
3523
3524 network_file_fail:
3525
3526 if (addresses) {
3527 p = addresses;
3528
3529 for (;;) {
3530 _cleanup_free_ char *address_str = NULL;
3531 char *prefixlen_str;
3532 int family;
3533 unsigned char prefixlen;
3534
3535 r = extract_first_word(&p, &address_str, NULL, 0);
3536 if (r < 0) {
3537 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3538 continue;
3539 }
3540 if (r == 0)
3541 break;
3542
3543 prefixlen_str = strchr(address_str, '/');
3544 if (!prefixlen_str) {
3545 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3546 continue;
3547 }
3548
3549 *prefixlen_str++ = '\0';
3550
3551 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3552 if (r != 1) {
3553 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3554 continue;
3555 }
3556
3557 r = in_addr_from_string_auto(address_str, &family, &address);
3558 if (r < 0) {
3559 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3560 continue;
3561 }
3562
3563 r = address_add(link, family, &address, prefixlen, NULL);
3564 if (r < 0)
3565 return log_link_error_errno(link, r, "Failed to add address: %m");
3566 }
3567 }
3568
3569 if (routes) {
3570 p = routes;
3571
3572 for (;;) {
3573 Route *route;
3574 _cleanup_free_ char *route_str = NULL;
3575 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3576 usec_t lifetime;
3577 char *prefixlen_str;
3578 int family;
3579 unsigned char prefixlen, tos, table;
3580 uint32_t priority;
3581
3582 r = extract_first_word(&p, &route_str, NULL, 0);
3583 if (r < 0) {
3584 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3585 continue;
3586 }
3587 if (r == 0)
3588 break;
3589
3590 prefixlen_str = strchr(route_str, '/');
3591 if (!prefixlen_str) {
3592 log_link_debug(link, "Failed to parse route %s", route_str);
3593 continue;
3594 }
3595
3596 *prefixlen_str++ = '\0';
3597
3598 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3599 if (r != 5) {
3600 log_link_debug(link,
3601 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3602 prefixlen_str);
3603 continue;
3604 }
3605
3606 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3607 if (r < 0) {
3608 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3609 continue;
3610 }
3611
3612 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3613 if (r < 0)
3614 return log_link_error_errno(link, r, "Failed to add route: %m");
3615
3616 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3617 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3618 0, route_expire_handler, route);
3619 if (r < 0)
3620 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3621 }
3622
3623 route->lifetime = lifetime;
3624 sd_event_source_unref(route->expire);
3625 route->expire = TAKE_PTR(expire);
3626 }
3627 }
3628
3629 if (dhcp4_address) {
3630 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3631 if (r < 0) {
3632 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3633 goto dhcp4_address_fail;
3634 }
3635
3636 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3637 if (r < 0)
3638 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3639
3640 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3641 if (r < 0)
3642 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3643 }
3644
3645 dhcp4_address_fail:
3646
3647 if (ipv4ll_address) {
3648 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3649 if (r < 0) {
3650 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3651 goto ipv4ll_address_fail;
3652 }
3653
3654 r = sd_ipv4ll_new(&link->ipv4ll);
3655 if (r < 0)
3656 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3657
3658 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3659 if (r < 0)
3660 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3661 }
3662
3663 ipv4ll_address_fail:
3664
3665 return 0;
3666 }
3667
3668 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3669 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3670 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3671 Link *link;
3672 int r;
3673
3674 assert(m);
3675 assert(m->rtnl);
3676 assert(message);
3677 assert(ret);
3678
3679 r = link_new(m, message, ret);
3680 if (r < 0)
3681 return r;
3682
3683 link = *ret;
3684
3685 log_link_debug(link, "Link %d added", link->ifindex);
3686
3687 r = link_load(link);
3688 if (r < 0)
3689 return r;
3690
3691 if (detect_container() <= 0) {
3692 /* not in a container, udev will be around */
3693 sprintf(ifindex_str, "n%d", link->ifindex);
3694 r = sd_device_new_from_device_id(&device, ifindex_str);
3695 if (r < 0) {
3696 log_link_warning_errno(link, r, "Could not find device: %m");
3697 goto failed;
3698 }
3699
3700 r = sd_device_get_is_initialized(device);
3701 if (r < 0) {
3702 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3703 goto failed;
3704 }
3705 if (r == 0) {
3706 /* not yet ready */
3707 log_link_debug(link, "link pending udev initialization...");
3708 return 0;
3709 }
3710
3711 r = device_is_renaming(device);
3712 if (r < 0) {
3713 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3714 goto failed;
3715 }
3716 if (r > 0) {
3717 log_link_debug(link, "Interface is under renaming, pending initialization.");
3718 return 0;
3719 }
3720
3721 r = link_initialized(link, device);
3722 if (r < 0)
3723 goto failed;
3724 } else {
3725 r = link_initialized_and_synced(link);
3726 if (r < 0)
3727 goto failed;
3728 }
3729
3730 return 0;
3731 failed:
3732 link_enter_failed(link);
3733 return r;
3734 }
3735
3736 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3737 int r;
3738
3739 assert(link);
3740
3741 log_link_info(link, "Gained IPv6LL");
3742
3743 link->ipv6ll_address = *address;
3744 link_check_ready(link);
3745
3746 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3747 r = link_acquire_ipv6_conf(link);
3748 if (r < 0) {
3749 link_enter_failed(link);
3750 return r;
3751 }
3752 }
3753
3754 return 0;
3755 }
3756
3757 static int link_carrier_gained(Link *link) {
3758 int r;
3759
3760 assert(link);
3761
3762 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3763 r = link_acquire_conf(link);
3764 if (r < 0) {
3765 link_enter_failed(link);
3766 return r;
3767 }
3768
3769 r = link_request_set_addresses(link);
3770 if (r < 0)
3771 return r;
3772 }
3773
3774 r = link_handle_bound_by_list(link);
3775 if (r < 0)
3776 return r;
3777
3778 return 0;
3779 }
3780
3781 static int link_carrier_lost(Link *link) {
3782 int r;
3783
3784 assert(link);
3785
3786 if (link->network && link->network->ignore_carrier_loss)
3787 return 0;
3788
3789 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3790 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3791 * configuration and stop the clients as well. */
3792 if (link->setting_mtu)
3793 return 0;
3794
3795 r = link_stop_clients(link);
3796 if (r < 0) {
3797 link_enter_failed(link);
3798 return r;
3799 }
3800
3801 if (link_dhcp4_server_enabled(link))
3802 (void) sd_dhcp_server_stop(link->dhcp_server);
3803
3804 r = link_drop_config(link);
3805 if (r < 0)
3806 return r;
3807
3808 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3809 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3810 r = link_drop_foreign_config(link);
3811 if (r < 0)
3812 return r;
3813 }
3814
3815 r = link_handle_bound_by_list(link);
3816 if (r < 0)
3817 return r;
3818
3819 return 0;
3820 }
3821
3822 int link_carrier_reset(Link *link) {
3823 int r;
3824
3825 assert(link);
3826
3827 if (link_has_carrier(link)) {
3828 r = link_carrier_lost(link);
3829 if (r < 0)
3830 return r;
3831
3832 r = link_carrier_gained(link);
3833 if (r < 0)
3834 return r;
3835
3836 log_link_info(link, "Reset carrier");
3837 }
3838
3839 return 0;
3840 }
3841
3842 int link_update(Link *link, sd_netlink_message *m) {
3843 struct ether_addr mac;
3844 const char *ifname;
3845 uint32_t mtu;
3846 bool had_carrier, carrier_gained, carrier_lost;
3847 int r;
3848
3849 assert(link);
3850 assert(link->ifname);
3851 assert(m);
3852
3853 if (link->state == LINK_STATE_LINGER) {
3854 log_link_info(link, "Link re-added");
3855 link_set_state(link, LINK_STATE_CONFIGURING);
3856
3857 r = link_new_carrier_maps(link);
3858 if (r < 0)
3859 return r;
3860 }
3861
3862 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3863 if (r >= 0 && !streq(ifname, link->ifname)) {
3864 Manager *manager = link->manager;
3865
3866 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3867
3868 link_drop(link);
3869 r = link_add(manager, m, &link);
3870 if (r < 0)
3871 return r;
3872 }
3873
3874 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3875 if (r >= 0 && mtu > 0) {
3876 link->mtu = mtu;
3877 if (link->original_mtu == 0) {
3878 link->original_mtu = mtu;
3879 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3880 }
3881
3882 if (link->dhcp_client) {
3883 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3884 link->mtu);
3885 if (r < 0)
3886 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3887 }
3888
3889 if (link->radv) {
3890 r = sd_radv_set_mtu(link->radv, link->mtu);
3891 if (r < 0)
3892 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3893 }
3894 }
3895
3896 /* The kernel may broadcast NEWLINK messages without the MAC address
3897 set, simply ignore them. */
3898 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3899 if (r >= 0) {
3900 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3901 ETH_ALEN)) {
3902
3903 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3904 ETH_ALEN);
3905
3906 log_link_debug(link, "MAC address: "
3907 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3908 mac.ether_addr_octet[0],
3909 mac.ether_addr_octet[1],
3910 mac.ether_addr_octet[2],
3911 mac.ether_addr_octet[3],
3912 mac.ether_addr_octet[4],
3913 mac.ether_addr_octet[5]);
3914
3915 if (link->ipv4ll) {
3916 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3917 if (r < 0)
3918 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3919 }
3920
3921 if (link->dhcp_client) {
3922 r = sd_dhcp_client_set_mac(link->dhcp_client,
3923 (const uint8_t *) &link->mac,
3924 sizeof (link->mac),
3925 ARPHRD_ETHER);
3926 if (r < 0)
3927 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3928
3929 r = dhcp4_set_client_identifier(link);
3930 if (r < 0)
3931 return r;
3932 }
3933
3934 if (link->dhcp6_client) {
3935 const DUID* duid = link_get_duid(link);
3936
3937 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3938 (const uint8_t *) &link->mac,
3939 sizeof (link->mac),
3940 ARPHRD_ETHER);
3941 if (r < 0)
3942 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3943
3944 if (link->network->iaid_set) {
3945 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3946 link->network->iaid);
3947 if (r < 0)
3948 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3949 }
3950
3951 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3952 duid->type,
3953 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3954 duid->raw_data_len);
3955 if (r < 0)
3956 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3957 }
3958
3959 if (link->radv) {
3960 r = sd_radv_set_mac(link->radv, &link->mac);
3961 if (r < 0)
3962 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3963 }
3964
3965 if (link->ndisc) {
3966 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3967 if (r < 0)
3968 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3969 }
3970 }
3971 }
3972
3973 had_carrier = link_has_carrier(link);
3974
3975 r = link_update_flags(link, m);
3976 if (r < 0)
3977 return r;
3978
3979 r = link_update_lldp(link);
3980 if (r < 0)
3981 return r;
3982
3983 carrier_gained = !had_carrier && link_has_carrier(link);
3984 carrier_lost = had_carrier && !link_has_carrier(link);
3985
3986 if (carrier_gained) {
3987 log_link_info(link, "Gained carrier");
3988
3989 r = link_carrier_gained(link);
3990 if (r < 0)
3991 return r;
3992 } else if (carrier_lost) {
3993 log_link_info(link, "Lost carrier");
3994
3995 r = link_carrier_lost(link);
3996 if (r < 0)
3997 return r;
3998 }
3999
4000 return 0;
4001 }
4002
4003 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
4004 bool space = false;
4005 Iterator i;
4006 Link *link;
4007
4008 assert(f);
4009 assert(prefix);
4010
4011 if (hashmap_isempty(h))
4012 return;
4013
4014 fputs(prefix, f);
4015 HASHMAP_FOREACH(link, h, i) {
4016 if (space)
4017 fputc(' ', f);
4018
4019 fprintf(f, "%i", link->ifindex);
4020 space = true;
4021 }
4022
4023 fputc('\n', f);
4024 }
4025
4026 int link_save(Link *link) {
4027 _cleanup_free_ char *temp_path = NULL;
4028 _cleanup_fclose_ FILE *f = NULL;
4029 const char *admin_state, *oper_state;
4030 Address *a;
4031 Route *route;
4032 Iterator i;
4033 int r;
4034
4035 assert(link);
4036 assert(link->state_file);
4037 assert(link->lease_file);
4038 assert(link->manager);
4039
4040 if (link->state == LINK_STATE_LINGER) {
4041 (void) unlink(link->state_file);
4042 return 0;
4043 }
4044
4045 link_lldp_save(link);
4046
4047 admin_state = link_state_to_string(link->state);
4048 assert(admin_state);
4049
4050 oper_state = link_operstate_to_string(link->operstate);
4051 assert(oper_state);
4052
4053 r = fopen_temporary(link->state_file, &f, &temp_path);
4054 if (r < 0)
4055 goto fail;
4056
4057 (void) fchmod(fileno(f), 0644);
4058
4059 fprintf(f,
4060 "# This is private data. Do not parse.\n"
4061 "ADMIN_STATE=%s\n"
4062 "OPER_STATE=%s\n",
4063 admin_state, oper_state);
4064
4065 if (link->network) {
4066 bool space;
4067 sd_dhcp6_lease *dhcp6_lease = NULL;
4068 const char *dhcp_domainname = NULL;
4069 char **dhcp6_domains = NULL;
4070 char **dhcp_domains = NULL;
4071 unsigned j;
4072
4073 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4074 yes_no(link->network->required_for_online));
4075
4076 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
4077 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
4078
4079 if (link->dhcp6_client) {
4080 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
4081 if (r < 0 && r != -ENOMSG)
4082 log_link_debug(link, "No DHCPv6 lease");
4083 }
4084
4085 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4086
4087 fputs("DNS=", f);
4088 space = false;
4089
4090 for (j = 0; j < link->network->n_dns; j++) {
4091 _cleanup_free_ char *b = NULL;
4092
4093 r = in_addr_to_string(link->network->dns[j].family,
4094 &link->network->dns[j].address, &b);
4095 if (r < 0) {
4096 log_debug_errno(r, "Failed to format address, ignoring: %m");
4097 continue;
4098 }
4099
4100 if (space)
4101 fputc(' ', f);
4102 fputs(b, f);
4103 space = true;
4104 }
4105
4106 if (link->network->dhcp_use_dns &&
4107 link->dhcp_lease) {
4108 const struct in_addr *addresses;
4109
4110 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
4111 if (r > 0)
4112 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4113 space = true;
4114 }
4115
4116 if (link->network->dhcp_use_dns && dhcp6_lease) {
4117 struct in6_addr *in6_addrs;
4118
4119 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
4120 if (r > 0) {
4121 if (space)
4122 fputc(' ', f);
4123 serialize_in6_addrs(f, in6_addrs, r);
4124 space = true;
4125 }
4126 }
4127
4128 /* Make sure to flush out old entries before we use the NDISC data */
4129 ndisc_vacuum(link);
4130
4131 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4132 NDiscRDNSS *dd;
4133
4134 SET_FOREACH(dd, link->ndisc_rdnss, i) {
4135 if (space)
4136 fputc(' ', f);
4137
4138 serialize_in6_addrs(f, &dd->address, 1);
4139 space = true;
4140 }
4141 }
4142
4143 fputc('\n', f);
4144
4145 fputs("NTP=", f);
4146 space = false;
4147 fputstrv(f, link->network->ntp, NULL, &space);
4148
4149 if (link->network->dhcp_use_ntp &&
4150 link->dhcp_lease) {
4151 const struct in_addr *addresses;
4152
4153 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
4154 if (r > 0)
4155 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4156 space = true;
4157 }
4158
4159 if (link->network->dhcp_use_ntp && dhcp6_lease) {
4160 struct in6_addr *in6_addrs;
4161 char **hosts;
4162
4163 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
4164 &in6_addrs);
4165 if (r > 0) {
4166 if (space)
4167 fputc(' ', f);
4168 serialize_in6_addrs(f, in6_addrs, r);
4169 space = true;
4170 }
4171
4172 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
4173 if (r > 0)
4174 fputstrv(f, hosts, NULL, &space);
4175 }
4176
4177 fputc('\n', f);
4178
4179 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4180 if (link->dhcp_lease) {
4181 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4182 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4183 }
4184 if (dhcp6_lease)
4185 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4186 }
4187
4188 ordered_set_print(f, "DOMAINS=", link->network->search_domains);
4189
4190 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4191 NDiscDNSSL *dd;
4192
4193 if (dhcp_domainname)
4194 fputs_with_space(f, dhcp_domainname, NULL, &space);
4195 if (dhcp_domains)
4196 fputstrv(f, dhcp_domains, NULL, &space);
4197 if (dhcp6_domains)
4198 fputstrv(f, dhcp6_domains, NULL, &space);
4199
4200 SET_FOREACH(dd, link->ndisc_dnssl, i)
4201 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4202 }
4203
4204 fputc('\n', f);
4205
4206 ordered_set_print(f, "ROUTE_DOMAINS=", link->network->route_domains);
4207
4208 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4209 NDiscDNSSL *dd;
4210
4211 if (dhcp_domainname)
4212 fputs_with_space(f, dhcp_domainname, NULL, &space);
4213 if (dhcp_domains)
4214 fputstrv(f, dhcp_domains, NULL, &space);
4215 if (dhcp6_domains)
4216 fputstrv(f, dhcp6_domains, NULL, &space);
4217
4218 SET_FOREACH(dd, link->ndisc_dnssl, i)
4219 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4220 }
4221
4222 fputc('\n', f);
4223
4224 fprintf(f, "LLMNR=%s\n",
4225 resolve_support_to_string(link->network->llmnr));
4226 fprintf(f, "MDNS=%s\n",
4227 resolve_support_to_string(link->network->mdns));
4228 if (link->network->dns_default_route >= 0)
4229 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
4230
4231 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4232 fprintf(f, "DNS_OVER_TLS=%s\n",
4233 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
4234
4235 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
4236 fprintf(f, "DNSSEC=%s\n",
4237 dnssec_mode_to_string(link->network->dnssec_mode));
4238
4239 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
4240 const char *n;
4241
4242 fputs("DNSSEC_NTA=", f);
4243 space = false;
4244 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
4245 fputs_with_space(f, n, NULL, &space);
4246 fputc('\n', f);
4247 }
4248
4249 fputs("ADDRESSES=", f);
4250 space = false;
4251 SET_FOREACH(a, link->addresses, i) {
4252 _cleanup_free_ char *address_str = NULL;
4253
4254 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4255 if (r < 0)
4256 goto fail;
4257
4258 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4259 space = true;
4260 }
4261 fputc('\n', f);
4262
4263 fputs("ROUTES=", f);
4264 space = false;
4265 SET_FOREACH(route, link->routes, i) {
4266 _cleanup_free_ char *route_str = NULL;
4267
4268 r = in_addr_to_string(route->family, &route->dst, &route_str);
4269 if (r < 0)
4270 goto fail;
4271
4272 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4273 space ? " " : "", route_str,
4274 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4275 space = true;
4276 }
4277
4278 fputc('\n', f);
4279 }
4280
4281 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4282 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4283
4284 if (link->dhcp_lease) {
4285 struct in_addr address;
4286 const char *tz = NULL;
4287
4288 assert(link->network);
4289
4290 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
4291 if (r >= 0)
4292 fprintf(f, "TIMEZONE=%s\n", tz);
4293
4294 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
4295 if (r >= 0) {
4296 fputs("DHCP4_ADDRESS=", f);
4297 serialize_in_addrs(f, &address, 1, false, NULL);
4298 fputc('\n', f);
4299 }
4300
4301 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4302 if (r < 0)
4303 goto fail;
4304
4305 fprintf(f,
4306 "DHCP_LEASE=%s\n",
4307 link->lease_file);
4308 } else
4309 (void) unlink(link->lease_file);
4310
4311 if (link->ipv4ll) {
4312 struct in_addr address;
4313
4314 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4315 if (r >= 0) {
4316 fputs("IPV4LL_ADDRESS=", f);
4317 serialize_in_addrs(f, &address, 1, false, NULL);
4318 fputc('\n', f);
4319 }
4320 }
4321
4322 r = fflush_and_check(f);
4323 if (r < 0)
4324 goto fail;
4325
4326 if (rename(temp_path, link->state_file) < 0) {
4327 r = -errno;
4328 goto fail;
4329 }
4330
4331 return 0;
4332
4333 fail:
4334 (void) unlink(link->state_file);
4335 if (temp_path)
4336 (void) unlink(temp_path);
4337
4338 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4339 }
4340
4341 /* The serialized state in /run is no longer up-to-date. */
4342 void link_dirty(Link *link) {
4343 int r;
4344
4345 assert(link);
4346
4347 /* mark manager dirty as link is dirty */
4348 manager_dirty(link->manager);
4349
4350 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
4351 if (r < 0)
4352 /* allocation errors are ignored */
4353 return;
4354
4355 r = set_put(link->manager->dirty_links, link);
4356 if (r <= 0)
4357 /* don't take another ref if the link was already dirty */
4358 return;
4359
4360 link_ref(link);
4361 }
4362
4363 /* The serialized state in /run is up-to-date */
4364 void link_clean(Link *link) {
4365 assert(link);
4366 assert(link->manager);
4367
4368 link_unref(set_remove(link->manager->dirty_links, link));
4369 }
4370
4371 static const char* const link_state_table[_LINK_STATE_MAX] = {
4372 [LINK_STATE_PENDING] = "pending",
4373 [LINK_STATE_INITIALIZED] = "initialized",
4374 [LINK_STATE_CONFIGURING] = "configuring",
4375 [LINK_STATE_CONFIGURED] = "configured",
4376 [LINK_STATE_UNMANAGED] = "unmanaged",
4377 [LINK_STATE_FAILED] = "failed",
4378 [LINK_STATE_LINGER] = "linger",
4379 };
4380
4381 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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