]> git.ipfire.org Git - thirdparty/systemd.git/blob - src/network/networkd-link.c
projects / thirdparty / systemd.git / blob
? search:


84a0bf3c72715b670f84afc353e510bda550e3ff
[thirdparty/systemd.git] / src / network / networkd-link.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <netinet/in.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_ipv4_forward_enabled(Link *link) {
199 assert(link);
200
201 if (link->flags & IFF_LOOPBACK)
202 return false;
203
204 if (!link->network)
205 return false;
206
207 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
208 return false;
209
210 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
211 }
212
213 static bool link_ipv6_forward_enabled(Link *link) {
214 assert(link);
215
216 if (!socket_ipv6_is_supported())
217 return false;
218
219 if (link->flags & IFF_LOOPBACK)
220 return false;
221
222 if (!link->network)
223 return false;
224
225 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
226 return false;
227
228 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
229 return false;
230
231 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
232 }
233
234 static bool link_proxy_arp_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->proxy_arp < 0)
244 return false;
245
246 return true;
247 }
248
249 static bool link_ipv6_accept_ra_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_ipv6ll_enabled(link))
262 return false;
263
264 /* If unset use system default (enabled if local forwarding is disabled.
265 * disabled if local forwarding is enabled).
266 * If set, ignore or enforce RA independent of local forwarding state.
267 */
268 if (link->network->ipv6_accept_ra < 0)
269 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
270 return !link_ipv6_forward_enabled(link);
271 else if (link->network->ipv6_accept_ra > 0)
272 /* accept RA even if ip_forward is enabled */
273 return true;
274 else
275 /* ignore RA */
276 return false;
277 }
278
279 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
280 assert(link);
281
282 if (!socket_ipv6_is_supported())
283 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
284
285 if (link->flags & IFF_LOOPBACK)
286 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
287
288 if (!link->network)
289 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
290
291 return link->network->ipv6_privacy_extensions;
292 }
293
294 static int link_enable_ipv6(Link *link) {
295 bool disabled;
296 int r;
297
298 if (link->flags & IFF_LOOPBACK)
299 return 0;
300
301 disabled = !link_ipv6_enabled(link);
302
303 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", disabled);
304 if (r < 0)
305 log_link_warning_errno(link, r, "Cannot %s IPv6: %m", enable_disable(!disabled));
306 else
307 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
308
309 return 0;
310 }
311
312 static bool link_is_enslaved(Link *link) {
313 if (link->flags & IFF_SLAVE)
314 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
315 return true;
316
317 if (!link->enslaved_raw)
318 return false;
319
320 if (!link->network)
321 return false;
322
323 if (link->network->bridge)
324 /* TODO: support the case when link is not managed by networkd. */
325 return true;
326
327 return false;
328 }
329
330 static void link_update_master_operstate(Link *link, NetDev *netdev) {
331 Link *master;
332
333 if (!netdev)
334 return;
335
336 if (link_get(link->manager, netdev->ifindex, &master) < 0)
337 return;
338
339 link_update_operstate(master, true);
340 }
341
342 void link_update_operstate(Link *link, bool also_update_master) {
343 LinkOperationalState operstate;
344 Iterator i;
345
346 assert(link);
347
348 if (link->kernel_operstate == IF_OPER_DORMANT)
349 operstate = LINK_OPERSTATE_DORMANT;
350 else if (link_has_carrier(link)) {
351 Address *address;
352 uint8_t scope = RT_SCOPE_NOWHERE;
353
354 /* if we have carrier, check what addresses we have */
355 SET_FOREACH(address, link->addresses, i) {
356 if (!address_is_ready(address))
357 continue;
358
359 if (address->scope < scope)
360 scope = address->scope;
361 }
362
363 /* for operstate we also take foreign addresses into account */
364 SET_FOREACH(address, link->addresses_foreign, i) {
365 if (!address_is_ready(address))
366 continue;
367
368 if (address->scope < scope)
369 scope = address->scope;
370 }
371
372 if (scope < RT_SCOPE_SITE)
373 /* universally accessible addresses found */
374 operstate = LINK_OPERSTATE_ROUTABLE;
375 else if (scope < RT_SCOPE_HOST)
376 /* only link or site local addresses found */
377 operstate = LINK_OPERSTATE_DEGRADED;
378 else
379 /* no useful addresses found */
380 operstate = LINK_OPERSTATE_CARRIER;
381 } else if (link->flags & IFF_UP)
382 operstate = LINK_OPERSTATE_NO_CARRIER;
383 else
384 operstate = LINK_OPERSTATE_OFF;
385
386 if (IN_SET(operstate, LINK_OPERSTATE_DEGRADED, LINK_OPERSTATE_CARRIER) &&
387 link_is_enslaved(link))
388 operstate = LINK_OPERSTATE_ENSLAVED;
389
390 if (operstate >= LINK_OPERSTATE_CARRIER) {
391 Link *slave;
392
393 SET_FOREACH(slave, link->slaves, i) {
394 link_update_operstate(slave, false);
395
396 if (slave->operstate < LINK_OPERSTATE_CARRIER)
397 operstate = LINK_OPERSTATE_DEGRADED_CARRIER;
398 }
399 }
400
401 if (link->operstate != operstate) {
402 link->operstate = operstate;
403 link_send_changed(link, "OperationalState", NULL);
404 link_dirty(link);
405 }
406
407 if (also_update_master && link->network) {
408 link_update_master_operstate(link, link->network->bond);
409 link_update_master_operstate(link, link->network->bridge);
410 }
411 }
412
413 #define FLAG_STRING(string, flag, old, new) \
414 (((old ^ new) & flag) \
415 ? ((old & flag) ? (" -" string) : (" +" string)) \
416 : "")
417
418 static int link_update_flags(Link *link, sd_netlink_message *m) {
419 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
420 uint8_t operstate;
421 int r;
422
423 assert(link);
424
425 r = sd_rtnl_message_link_get_flags(m, &flags);
426 if (r < 0)
427 return log_link_warning_errno(link, r, "Could not get link flags: %m");
428
429 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
430 if (r < 0)
431 /* if we got a message without operstate, take it to mean
432 the state was unchanged */
433 operstate = link->kernel_operstate;
434
435 if ((link->flags == flags) && (link->kernel_operstate == operstate))
436 return 0;
437
438 if (link->flags != flags) {
439 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",
440 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
441 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
442 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
443 FLAG_STRING("UP", IFF_UP, link->flags, flags),
444 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
445 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
446 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
447 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
448 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
449 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
450 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
451 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
452 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
453 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
454 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
455 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
456 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
457 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
458 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
459
460 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
461 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
462 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
463 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
464 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
465 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
466 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
467 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
468
469 /* link flags are currently at most 18 bits, let's align to
470 * printing 20 */
471 if (unknown_flags_added)
472 log_link_debug(link,
473 "Unknown link flags gained: %#.5x (ignoring)",
474 unknown_flags_added);
475
476 if (unknown_flags_removed)
477 log_link_debug(link,
478 "Unknown link flags lost: %#.5x (ignoring)",
479 unknown_flags_removed);
480 }
481
482 link->flags = flags;
483 link->kernel_operstate = operstate;
484
485 link_update_operstate(link, true);
486
487 return 0;
488 }
489
490 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
491 _cleanup_(link_unrefp) Link *link = NULL;
492 uint16_t type;
493 const char *ifname, *kind = NULL;
494 int r, ifindex;
495 unsigned short iftype;
496
497 assert(manager);
498 assert(message);
499 assert(ret);
500
501 /* check for link kind */
502 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
503 if (r == 0) {
504 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
505 r = sd_netlink_message_exit_container(message);
506 if (r < 0)
507 return r;
508 }
509
510 r = sd_netlink_message_get_type(message, &type);
511 if (r < 0)
512 return r;
513 else if (type != RTM_NEWLINK)
514 return -EINVAL;
515
516 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
517 if (r < 0)
518 return r;
519 else if (ifindex <= 0)
520 return -EINVAL;
521
522 r = sd_rtnl_message_link_get_type(message, &iftype);
523 if (r < 0)
524 return r;
525
526 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
527 if (r < 0)
528 return r;
529
530 link = new(Link, 1);
531 if (!link)
532 return -ENOMEM;
533
534 *link = (Link) {
535 .n_ref = 1,
536 .manager = manager,
537 .state = LINK_STATE_PENDING,
538 .rtnl_extended_attrs = true,
539 .ifindex = ifindex,
540 .iftype = iftype,
541 };
542
543 link->ifname = strdup(ifname);
544 if (!link->ifname)
545 return -ENOMEM;
546
547 if (kind) {
548 link->kind = strdup(kind);
549 if (!link->kind)
550 return -ENOMEM;
551 }
552
553 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
554 if (r < 0)
555 log_link_debug_errno(link, r, "New device has no master, continuing without");
556
557 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
558 if (r < 0)
559 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
560
561 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
562 return -ENOMEM;
563
564 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
565 return -ENOMEM;
566
567 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
568 return -ENOMEM;
569
570 r = hashmap_ensure_allocated(&manager->links, NULL);
571 if (r < 0)
572 return r;
573
574 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
575 if (r < 0)
576 return r;
577
578 r = link_update_flags(link, message);
579 if (r < 0)
580 return r;
581
582 *ret = TAKE_PTR(link);
583
584 return 0;
585 }
586
587 static Link *link_free(Link *link) {
588 Address *address;
589
590 assert(link);
591
592 link->routes = set_free_with_destructor(link->routes, route_free);
593 link->routes_foreign = set_free_with_destructor(link->routes_foreign, route_free);
594
595 link->addresses = set_free_with_destructor(link->addresses, address_free);
596 link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free);
597
598 while ((address = link->pool_addresses)) {
599 LIST_REMOVE(addresses, link->pool_addresses, address);
600 address_free(address);
601 }
602
603 sd_dhcp_server_unref(link->dhcp_server);
604 sd_dhcp_client_unref(link->dhcp_client);
605 sd_dhcp_lease_unref(link->dhcp_lease);
606
607 link_lldp_emit_stop(link);
608
609 free(link->lease_file);
610
611 sd_lldp_unref(link->lldp);
612 free(link->lldp_file);
613
614 ndisc_flush(link);
615
616 sd_ipv4ll_unref(link->ipv4ll);
617 sd_dhcp6_client_unref(link->dhcp6_client);
618 sd_ndisc_unref(link->ndisc);
619 sd_radv_unref(link->radv);
620
621 free(link->ifname);
622 free(link->kind);
623
624 (void) unlink(link->state_file);
625 free(link->state_file);
626
627 sd_device_unref(link->sd_device);
628
629 hashmap_free(link->bound_to_links);
630 hashmap_free(link->bound_by_links);
631
632 set_free_with_destructor(link->slaves, link_unref);
633
634 network_unref(link->network);
635
636 return mfree(link);
637 }
638
639 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
640
641 int link_get(Manager *m, int ifindex, Link **ret) {
642 Link *link;
643
644 assert(m);
645 assert(ifindex);
646 assert(ret);
647
648 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
649 if (!link)
650 return -ENODEV;
651
652 *ret = link;
653
654 return 0;
655 }
656
657 static void link_set_state(Link *link, LinkState state) {
658 assert(link);
659
660 if (link->state == state)
661 return;
662
663 log_link_debug(link, "State changed: %s -> %s",
664 link_state_to_string(link->state),
665 link_state_to_string(state));
666
667 link->state = state;
668
669 link_send_changed(link, "AdministrativeState", NULL);
670 }
671
672 static void link_enter_unmanaged(Link *link) {
673 assert(link);
674
675 log_link_debug(link, "Unmanaged");
676
677 link_set_state(link, LINK_STATE_UNMANAGED);
678
679 link_dirty(link);
680 }
681
682 int link_stop_clients(Link *link) {
683 int r = 0, k;
684
685 assert(link);
686 assert(link->manager);
687 assert(link->manager->event);
688
689 if (link->dhcp_client) {
690 k = sd_dhcp_client_stop(link->dhcp_client);
691 if (k < 0)
692 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
693 }
694
695 if (link->ipv4ll) {
696 k = sd_ipv4ll_stop(link->ipv4ll);
697 if (k < 0)
698 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
699 }
700
701 if (link->dhcp6_client) {
702 k = sd_dhcp6_client_stop(link->dhcp6_client);
703 if (k < 0)
704 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
705 }
706
707 if (link->ndisc) {
708 k = sd_ndisc_stop(link->ndisc);
709 if (k < 0)
710 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
711 }
712
713 if (link->radv) {
714 k = sd_radv_stop(link->radv);
715 if (k < 0)
716 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
717 }
718
719 link_lldp_emit_stop(link);
720 return r;
721 }
722
723 void link_enter_failed(Link *link) {
724 assert(link);
725
726 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
727 return;
728
729 log_link_warning(link, "Failed");
730
731 link_set_state(link, LINK_STATE_FAILED);
732
733 link_stop_clients(link);
734
735 link_dirty(link);
736 }
737
738 static Address* link_find_dhcp_server_address(Link *link) {
739 Address *address;
740
741 assert(link);
742 assert(link->network);
743
744 /* The first statically configured address if there is any */
745 LIST_FOREACH(addresses, address, link->network->static_addresses) {
746
747 if (address->family != AF_INET)
748 continue;
749
750 if (in_addr_is_null(address->family, &address->in_addr))
751 continue;
752
753 return address;
754 }
755
756 /* If that didn't work, find a suitable address we got from the pool */
757 LIST_FOREACH(addresses, address, link->pool_addresses) {
758 if (address->family != AF_INET)
759 continue;
760
761 return address;
762 }
763
764 return NULL;
765 }
766
767 static int link_join_netdevs_after_configured(Link *link) {
768 NetDev *netdev;
769 Iterator i;
770 int r;
771
772 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
773 if (netdev->ifindex > 0)
774 /* Assume already enslaved. */
775 continue;
776
777 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
778 continue;
779
780 log_struct(LOG_DEBUG,
781 LOG_LINK_INTERFACE(link),
782 LOG_NETDEV_INTERFACE(netdev),
783 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
784
785 r = netdev_join(netdev, link, NULL);
786 if (r < 0)
787 return log_struct_errno(LOG_WARNING, r,
788 LOG_LINK_INTERFACE(link),
789 LOG_NETDEV_INTERFACE(netdev),
790 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
791 }
792
793 return 0;
794 }
795
796 static void link_enter_configured(Link *link) {
797 assert(link);
798 assert(link->network);
799
800 if (link->state != LINK_STATE_CONFIGURING)
801 return;
802
803 log_link_info(link, "Configured");
804
805 link_set_state(link, LINK_STATE_CONFIGURED);
806
807 (void) link_join_netdevs_after_configured(link);
808
809 link_dirty(link);
810 }
811
812 static int link_request_set_routing_policy_rule(Link *link) {
813 RoutingPolicyRule *rule, *rrule = NULL;
814 int r;
815
816 assert(link);
817 assert(link->network);
818
819 link_set_state(link, LINK_STATE_CONFIGURING);
820 link->routing_policy_rules_configured = false;
821
822 LIST_FOREACH(rules, rule, link->network->rules) {
823 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
824 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif,
825 rule->protocol, &rule->sport, &rule->dport, &rrule);
826 if (r == 0) {
827 (void) routing_policy_rule_make_local(link->manager, rrule);
828 continue;
829 }
830
831 r = routing_policy_rule_configure(rule, link, NULL, false);
832 if (r < 0) {
833 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
834 link_enter_failed(link);
835 return r;
836 }
837
838 link->routing_policy_rule_messages++;
839 }
840
841 routing_policy_rule_purge(link->manager, link);
842 if (link->routing_policy_rule_messages == 0) {
843 link->routing_policy_rules_configured = true;
844 link_check_ready(link);
845 } else
846 log_link_debug(link, "Setting routing policy rules");
847
848 return 0;
849 }
850
851 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
852 int r;
853
854 assert(link);
855 assert(link->route_messages > 0);
856 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
857 LINK_STATE_FAILED, LINK_STATE_LINGER));
858
859 link->route_messages--;
860
861 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
862 return 1;
863
864 r = sd_netlink_message_get_errno(m);
865 if (r < 0 && r != -EEXIST)
866 log_link_warning_errno(link, r, "Could not set route: %m");
867
868 if (link->route_messages == 0) {
869 log_link_debug(link, "Routes set");
870 link->static_routes_configured = true;
871 link_check_ready(link);
872 }
873
874 return 1;
875 }
876
877 int link_request_set_routes(Link *link) {
878 enum {
879 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
880 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
881 _PHASE_MAX
882 } phase;
883 Route *rt;
884 int r;
885
886 assert(link);
887 assert(link->network);
888 assert(link->addresses_configured);
889 assert(link->address_messages == 0);
890 assert(link->state != _LINK_STATE_INVALID);
891
892 link_set_state(link, LINK_STATE_CONFIGURING);
893 link->static_routes_configured = false;
894
895 r = link_request_set_routing_policy_rule(link);
896 if (r < 0)
897 return r;
898
899 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
900 for (phase = 0; phase < _PHASE_MAX; phase++)
901 LIST_FOREACH(routes, rt, link->network->static_routes) {
902
903 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
904 continue;
905
906 r = route_configure(rt, link, route_handler);
907 if (r < 0) {
908 log_link_warning_errno(link, r, "Could not set routes: %m");
909 link_enter_failed(link);
910 return r;
911 }
912
913 link->route_messages++;
914 }
915
916 if (link->route_messages == 0) {
917 link->static_routes_configured = true;
918 link_check_ready(link);
919 } else
920 log_link_debug(link, "Setting routes");
921
922 return 0;
923 }
924
925 void link_check_ready(Link *link) {
926 Address *a;
927 Iterator i;
928
929 assert(link);
930
931 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
932 return;
933
934 if (!link->network)
935 return;
936
937 if (!link->addresses_configured)
938 return;
939
940 if (!link->neighbors_configured)
941 return;
942
943 SET_FOREACH(a, link->addresses, i)
944 if (!address_is_ready(a))
945 return;
946
947 if (!link->addresses_ready) {
948 link->addresses_ready = true;
949 link_request_set_routes(link);
950 }
951
952 if (!link->static_routes_configured)
953 return;
954
955 if (!link->routing_policy_rules_configured)
956 return;
957
958 if (link_ipv4ll_enabled(link) && !(link->ipv4ll_address && link->ipv4ll_route))
959 return;
960
961 if (link_ipv6ll_enabled(link) &&
962 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
963 return;
964
965 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
966 !(link->dhcp4_configured || link->dhcp6_configured) &&
967 !(link_ipv4ll_fallback_enabled(link) && link->ipv4ll_address && link->ipv4ll_route))
968 /* When DHCP is enabled, at least one protocol must provide an address, or
969 * an IPv4ll fallback address must be configured. */
970 return;
971
972 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
973 return;
974
975 if (link->state != LINK_STATE_CONFIGURED)
976 link_enter_configured(link);
977
978 return;
979 }
980
981 static int link_request_set_neighbors(Link *link) {
982 Neighbor *neighbor;
983 int r;
984
985 assert(link);
986 assert(link->network);
987 assert(link->state != _LINK_STATE_INVALID);
988
989 link_set_state(link, LINK_STATE_CONFIGURING);
990 link->neighbors_configured = false;
991
992 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
993 r = neighbor_configure(neighbor, link, NULL);
994 if (r < 0) {
995 log_link_warning_errno(link, r, "Could not set neighbor: %m");
996 link_enter_failed(link);
997 return r;
998 }
999 }
1000
1001 if (link->neighbor_messages == 0) {
1002 link->neighbors_configured = true;
1003 link_check_ready(link);
1004 } else
1005 log_link_debug(link, "Setting neighbors");
1006
1007 return 0;
1008 }
1009
1010 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1011 int r;
1012
1013 assert(rtnl);
1014 assert(m);
1015 assert(link);
1016 assert(link->ifname);
1017 assert(link->address_messages > 0);
1018 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1019 LINK_STATE_FAILED, LINK_STATE_LINGER));
1020
1021 link->address_messages--;
1022
1023 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1024 return 1;
1025
1026 r = sd_netlink_message_get_errno(m);
1027 if (r < 0 && r != -EEXIST)
1028 log_link_warning_errno(link, r, "could not set address: %m");
1029 else if (r >= 0)
1030 manager_rtnl_process_address(rtnl, m, link->manager);
1031
1032 if (link->address_messages == 0) {
1033 log_link_debug(link, "Addresses set");
1034 link->addresses_configured = true;
1035 link_check_ready(link);
1036 }
1037
1038 return 1;
1039 }
1040
1041 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1042 _cleanup_free_ struct in_addr *addresses = NULL;
1043 size_t n_addresses = 0, n_allocated = 0;
1044 unsigned i;
1045
1046 log_debug("Copying DNS server information from %s", link->ifname);
1047
1048 if (!link->network)
1049 return 0;
1050
1051 for (i = 0; i < link->network->n_dns; i++) {
1052 struct in_addr ia;
1053
1054 /* Only look for IPv4 addresses */
1055 if (link->network->dns[i].family != AF_INET)
1056 continue;
1057
1058 ia = link->network->dns[i].address.in;
1059
1060 /* Never propagate obviously borked data */
1061 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1062 continue;
1063
1064 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1065 return log_oom();
1066
1067 addresses[n_addresses++] = ia;
1068 }
1069
1070 if (link->network->dhcp_use_dns && link->dhcp_lease) {
1071 const struct in_addr *da = NULL;
1072 int j, n;
1073
1074 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
1075 if (n > 0) {
1076
1077 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1078 return log_oom();
1079
1080 for (j = 0; j < n; j++)
1081 if (in4_addr_is_non_local(&da[j]))
1082 addresses[n_addresses++] = da[j];
1083 }
1084 }
1085
1086 if (n_addresses <= 0)
1087 return 0;
1088
1089 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
1090 }
1091
1092 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1093 _cleanup_free_ struct in_addr *addresses = NULL;
1094 size_t n_addresses = 0, n_allocated = 0;
1095 char **a;
1096
1097 if (!link->network)
1098 return 0;
1099
1100 log_debug("Copying NTP server information from %s", link->ifname);
1101
1102 STRV_FOREACH(a, link->network->ntp) {
1103 union in_addr_union ia;
1104
1105 /* Only look for IPv4 addresses */
1106 if (in_addr_from_string(AF_INET, *a, &ia) <= 0)
1107 continue;
1108
1109 /* Never propagate obviously borked data */
1110 if (in4_addr_is_null(&ia.in) || in4_addr_is_localhost(&ia.in))
1111 continue;
1112
1113 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1114 return log_oom();
1115
1116 addresses[n_addresses++] = ia.in;
1117 }
1118
1119 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1120 const struct in_addr *da = NULL;
1121 int j, n;
1122
1123 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1124 if (n > 0) {
1125
1126 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1127 return log_oom();
1128
1129 for (j = 0; j < n; j++)
1130 if (in4_addr_is_non_local(&da[j]))
1131 addresses[n_addresses++] = da[j];
1132 }
1133 }
1134
1135 if (n_addresses <= 0)
1136 return 0;
1137
1138 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1139 }
1140
1141 static int link_set_bridge_fdb(Link *link) {
1142 FdbEntry *fdb_entry;
1143 int r;
1144
1145 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1146 r = fdb_entry_configure(link, fdb_entry);
1147 if (r < 0)
1148 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1149 }
1150
1151 return 0;
1152 }
1153
1154 static int link_request_set_addresses(Link *link) {
1155 AddressLabel *label;
1156 Address *ad;
1157 int r;
1158
1159 assert(link);
1160 assert(link->network);
1161 assert(link->state != _LINK_STATE_INVALID);
1162
1163 link_set_state(link, LINK_STATE_CONFIGURING);
1164
1165 /* Reset all *_configured flags we are configuring. */
1166 link->addresses_configured = false;
1167 link->addresses_ready = false;
1168 link->neighbors_configured = false;
1169 link->static_routes_configured = false;
1170 link->routing_policy_rules_configured = false;
1171
1172 r = link_set_bridge_fdb(link);
1173 if (r < 0)
1174 return r;
1175
1176 r = link_request_set_neighbors(link);
1177 if (r < 0)
1178 return r;
1179
1180 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1181 bool update;
1182
1183 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1184
1185 r = address_configure(ad, link, address_handler, update);
1186 if (r < 0) {
1187 log_link_warning_errno(link, r, "Could not set addresses: %m");
1188 link_enter_failed(link);
1189 return r;
1190 }
1191
1192 link->address_messages++;
1193 }
1194
1195 LIST_FOREACH(labels, label, link->network->address_labels) {
1196 r = address_label_configure(label, link, NULL, false);
1197 if (r < 0) {
1198 log_link_warning_errno(link, r, "Could not set address label: %m");
1199 link_enter_failed(link);
1200 return r;
1201 }
1202
1203 link->address_label_messages++;
1204 }
1205
1206 /* now that we can figure out a default address for the dhcp server,
1207 start it */
1208 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1209 Address *address;
1210 Link *uplink = NULL;
1211 bool acquired_uplink = false;
1212
1213 address = link_find_dhcp_server_address(link);
1214 if (!address) {
1215 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1216 link_enter_failed(link);
1217 return 0;
1218 }
1219
1220 /* use the server address' subnet as the pool */
1221 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1222 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1223 if (r < 0)
1224 return r;
1225
1226 /* TODO:
1227 r = sd_dhcp_server_set_router(link->dhcp_server,
1228 &main_address->in_addr.in);
1229 if (r < 0)
1230 return r;
1231 */
1232
1233 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1234 r = sd_dhcp_server_set_max_lease_time(
1235 link->dhcp_server,
1236 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1237 if (r < 0)
1238 return r;
1239 }
1240
1241 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1242 r = sd_dhcp_server_set_default_lease_time(
1243 link->dhcp_server,
1244 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1245 if (r < 0)
1246 return r;
1247 }
1248
1249 if (link->network->dhcp_server_emit_dns) {
1250
1251 if (link->network->n_dhcp_server_dns > 0)
1252 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1253 else {
1254 uplink = manager_find_uplink(link->manager, link);
1255 acquired_uplink = true;
1256
1257 if (!uplink) {
1258 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1259 r = 0;
1260 } else
1261 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1262 }
1263 if (r < 0)
1264 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1265 }
1266
1267 if (link->network->dhcp_server_emit_ntp) {
1268
1269 if (link->network->n_dhcp_server_ntp > 0)
1270 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1271 else {
1272 if (!acquired_uplink)
1273 uplink = manager_find_uplink(link->manager, link);
1274
1275 if (!uplink) {
1276 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1277 r = 0;
1278 } else
1279 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1280
1281 }
1282 if (r < 0)
1283 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1284 }
1285
1286 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1287 if (r < 0)
1288 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1289
1290 if (link->network->dhcp_server_emit_timezone) {
1291 _cleanup_free_ char *buffer = NULL;
1292 const char *tz = NULL;
1293
1294 if (link->network->dhcp_server_timezone)
1295 tz = link->network->dhcp_server_timezone;
1296 else {
1297 r = get_timezone(&buffer);
1298 if (r < 0)
1299 log_warning_errno(r, "Failed to determine timezone: %m");
1300 else
1301 tz = buffer;
1302 }
1303
1304 if (tz) {
1305 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1306 if (r < 0)
1307 return r;
1308 }
1309 }
1310 if (!sd_dhcp_server_is_running(link->dhcp_server)) {
1311 r = sd_dhcp_server_start(link->dhcp_server);
1312 if (r < 0) {
1313 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1314
1315 link_enter_failed(link);
1316
1317 return 0;
1318 }
1319 }
1320
1321 log_link_debug(link, "Offering DHCPv4 leases");
1322 }
1323
1324 if (link->address_messages == 0) {
1325 link->addresses_configured = true;
1326 link_check_ready(link);
1327 } else
1328 log_link_debug(link, "Setting addresses");
1329
1330 return 0;
1331 }
1332
1333 static int link_set_bridge_vlan(Link *link) {
1334 int r = 0;
1335
1336 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1337 if (r < 0)
1338 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1339
1340 return r;
1341 }
1342
1343 static int link_set_proxy_arp(Link *link) {
1344 int r;
1345
1346 if (!link_proxy_arp_enabled(link))
1347 return 0;
1348
1349 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1350 if (r < 0)
1351 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1352
1353 return 0;
1354 }
1355
1356 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1357 int r;
1358
1359 assert(link);
1360
1361 log_link_debug(link, "Set link");
1362
1363 r = sd_netlink_message_get_errno(m);
1364 if (r < 0 && r != -EEXIST) {
1365 log_link_error_errno(link, r, "Could not join netdev: %m");
1366 link_enter_failed(link);
1367 }
1368
1369 return 1;
1370 }
1371
1372 static int link_configure_after_setting_mtu(Link *link);
1373
1374 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1375 int r;
1376
1377 assert(m);
1378 assert(link);
1379 assert(link->ifname);
1380
1381 link->setting_mtu = false;
1382
1383 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1384 return 1;
1385
1386 r = sd_netlink_message_get_errno(m);
1387 if (r < 0) {
1388 log_link_warning_errno(link, r, "Could not set MTU: %m");
1389 return 1;
1390 }
1391
1392 log_link_debug(link, "Setting MTU done.");
1393
1394 if (link->state == LINK_STATE_INITIALIZED)
1395 (void) link_configure_after_setting_mtu(link);
1396
1397 return 1;
1398 }
1399
1400 int link_set_mtu(Link *link, uint32_t mtu, bool force) {
1401 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1402 int r;
1403
1404 assert(link);
1405 assert(link->manager);
1406 assert(link->manager->rtnl);
1407
1408 if (mtu == 0 || link->setting_mtu)
1409 return 0;
1410
1411 if (force ? link->mtu == mtu : link->mtu >= mtu)
1412 return 0;
1413
1414 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1415
1416 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1417 if (r < 0)
1418 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1419
1420 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1421 * for this interface, then disable IPv6 else enable it. */
1422 (void) link_enable_ipv6(link);
1423
1424 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1425 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1426 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1427
1428 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1429 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1430
1431 mtu = IPV6_MIN_MTU;
1432 }
1433
1434 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1435 if (r < 0)
1436 return log_link_error_errno(link, r, "Could not append MTU: %m");
1437
1438 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1439 link_netlink_destroy_callback, link);
1440 if (r < 0)
1441 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1442
1443 link_ref(link);
1444 link->setting_mtu = true;
1445
1446 return 0;
1447 }
1448
1449 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1450 int r;
1451
1452 assert(m);
1453 assert(link);
1454 assert(link->ifname);
1455
1456 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1457 return 1;
1458
1459 r = sd_netlink_message_get_errno(m);
1460 if (r < 0)
1461 log_link_warning_errno(link, r, "Could not set link flags: %m");
1462
1463 return 1;
1464 }
1465
1466 static int link_set_flags(Link *link) {
1467 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1468 unsigned ifi_change = 0;
1469 unsigned ifi_flags = 0;
1470 int r;
1471
1472 assert(link);
1473 assert(link->manager);
1474 assert(link->manager->rtnl);
1475
1476 if (link->flags & IFF_LOOPBACK)
1477 return 0;
1478
1479 if (!link->network)
1480 return 0;
1481
1482 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1483 return 0;
1484
1485 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1486 if (r < 0)
1487 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1488
1489 if (link->network->arp >= 0) {
1490 ifi_change |= IFF_NOARP;
1491 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1492 }
1493
1494 if (link->network->multicast >= 0) {
1495 ifi_change |= IFF_MULTICAST;
1496 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1497 }
1498
1499 if (link->network->allmulticast >= 0) {
1500 ifi_change |= IFF_ALLMULTI;
1501 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1502 }
1503
1504 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1505 if (r < 0)
1506 return log_link_error_errno(link, r, "Could not set link flags: %m");
1507
1508 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1509 link_netlink_destroy_callback, link);
1510 if (r < 0)
1511 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1512
1513 link_ref(link);
1514
1515 return 0;
1516 }
1517
1518 static int link_set_bridge(Link *link) {
1519 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1520 int r;
1521
1522 assert(link);
1523 assert(link->network);
1524
1525 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1526 if (r < 0)
1527 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1528
1529 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1530 if (r < 0)
1531 return log_link_error_errno(link, r, "Could not set message family: %m");
1532
1533 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1534 if (r < 0)
1535 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1536
1537 if (link->network->use_bpdu >= 0) {
1538 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
1539 if (r < 0)
1540 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1541 }
1542
1543 if (link->network->hairpin >= 0) {
1544 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1545 if (r < 0)
1546 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1547 }
1548
1549 if (link->network->fast_leave >= 0) {
1550 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1551 if (r < 0)
1552 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1553 }
1554
1555 if (link->network->allow_port_to_be_root >= 0) {
1556 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
1557 if (r < 0)
1558 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1559 }
1560
1561 if (link->network->unicast_flood >= 0) {
1562 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1563 if (r < 0)
1564 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1565 }
1566
1567 if (link->network->multicast_flood >= 0) {
1568 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_FLOOD, link->network->multicast_flood);
1569 if (r < 0)
1570 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_FLOOD attribute: %m");
1571 }
1572
1573 if (link->network->multicast_to_unicast >= 0) {
1574 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_TO_UCAST, link->network->multicast_to_unicast);
1575 if (r < 0)
1576 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_TO_UCAST attribute: %m");
1577 }
1578
1579 if (link->network->neighbor_suppression >= 0) {
1580 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_NEIGH_SUPPRESS, link->network->neighbor_suppression);
1581 if (r < 0)
1582 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_NEIGH_SUPPRESS attribute: %m");
1583 }
1584
1585 if (link->network->learning >= 0) {
1586 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_LEARNING, link->network->learning);
1587 if (r < 0)
1588 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_LEARNING attribute: %m");
1589 }
1590
1591 if (link->network->bridge_proxy_arp >= 0) {
1592 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROXYARP, link->network->bridge_proxy_arp);
1593 if (r < 0)
1594 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROXYARP attribute: %m");
1595 }
1596
1597 if (link->network->bridge_proxy_arp_wifi >= 0) {
1598 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROXYARP_WIFI, link->network->bridge_proxy_arp_wifi);
1599 if (r < 0)
1600 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROXYARP_WIFI attribute: %m");
1601 }
1602
1603 if (link->network->cost != 0) {
1604 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1605 if (r < 0)
1606 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1607 }
1608
1609 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1610 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1611 if (r < 0)
1612 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1613 }
1614
1615 if (link->network->multicast_router != _MULTICAST_ROUTER_INVALID) {
1616 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MULTICAST_ROUTER, link->network->multicast_router);
1617 if (r < 0)
1618 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MULTICAST_ROUTER attribute: %m");
1619 }
1620
1621 r = sd_netlink_message_close_container(req);
1622 if (r < 0)
1623 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1624
1625 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_handler,
1626 link_netlink_destroy_callback, link);
1627 if (r < 0)
1628 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1629
1630 link_ref(link);
1631
1632 return r;
1633 }
1634
1635 static int link_set_bond_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1636 int r;
1637
1638 assert(m);
1639 assert(link);
1640 assert(link->ifname);
1641
1642 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1643 return 1;
1644
1645 r = sd_netlink_message_get_errno(m);
1646 if (r < 0) {
1647 log_link_warning_errno(link, r, "Could not set bonding interface: %m");
1648 return 1;
1649 }
1650
1651 return 1;
1652 }
1653
1654 static int link_set_bond(Link *link) {
1655 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1656 int r;
1657
1658 assert(link);
1659 assert(link->network);
1660
1661 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1662 if (r < 0)
1663 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1664
1665 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1666 if (r < 0)
1667 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1668
1669 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1670 if (r < 0)
1671 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1672
1673 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1674 if (r < 0)
1675 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1676
1677 if (link->network->active_slave) {
1678 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1679 if (r < 0)
1680 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1681 }
1682
1683 if (link->network->primary_slave) {
1684 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1685 if (r < 0)
1686 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1687 }
1688
1689 r = sd_netlink_message_close_container(req);
1690 if (r < 0)
1691 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1692
1693 r = sd_netlink_message_close_container(req);
1694 if (r < 0)
1695 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1696
1697 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_bond_handler,
1698 link_netlink_destroy_callback, link);
1699 if (r < 0)
1700 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1701
1702 link_ref(link);
1703
1704 return r;
1705 }
1706
1707 static int link_acquire_ipv6_conf(Link *link) {
1708 int r;
1709
1710 assert(link);
1711
1712 if (link_ipv6_accept_ra_enabled(link)) {
1713 assert(link->ndisc);
1714
1715 log_link_debug(link, "Discovering IPv6 routers");
1716
1717 r = sd_ndisc_start(link->ndisc);
1718 if (r < 0 && r != -EBUSY)
1719 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1720 }
1721
1722 if (link_radv_enabled(link)) {
1723 assert(link->radv);
1724 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1725
1726 log_link_debug(link, "Starting IPv6 Router Advertisements");
1727
1728 r = sd_radv_start(link->radv);
1729 if (r < 0 && r != -EBUSY)
1730 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1731 }
1732
1733 (void) dhcp6_request_prefix_delegation(link);
1734
1735 return 0;
1736 }
1737
1738 static int link_acquire_ipv4_conf(Link *link) {
1739 int r;
1740
1741 assert(link);
1742 assert(link->manager);
1743 assert(link->manager->event);
1744
1745 if (link_ipv4ll_enabled(link)) {
1746 assert(link->ipv4ll);
1747
1748 log_link_debug(link, "Acquiring IPv4 link-local address");
1749
1750 r = sd_ipv4ll_start(link->ipv4ll);
1751 if (r < 0)
1752 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1753 }
1754
1755 if (link_dhcp4_enabled(link)) {
1756 assert(link->dhcp_client);
1757
1758 log_link_debug(link, "Acquiring DHCPv4 lease");
1759
1760 r = sd_dhcp_client_start(link->dhcp_client);
1761 if (r < 0)
1762 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1763 }
1764
1765 return 0;
1766 }
1767
1768 static int link_acquire_conf(Link *link) {
1769 int r;
1770
1771 assert(link);
1772
1773 r = link_acquire_ipv4_conf(link);
1774 if (r < 0)
1775 return r;
1776
1777 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1778 r = link_acquire_ipv6_conf(link);
1779 if (r < 0)
1780 return r;
1781 }
1782
1783 if (link_lldp_emit_enabled(link)) {
1784 r = link_lldp_emit_start(link);
1785 if (r < 0)
1786 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1787 }
1788
1789 return 0;
1790 }
1791
1792 bool link_has_carrier(Link *link) {
1793 /* see Documentation/networking/operstates.txt in the kernel sources */
1794
1795 if (link->kernel_operstate == IF_OPER_UP)
1796 return true;
1797
1798 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1799 /* operstate may not be implemented, so fall back to flags */
1800 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1801 return true;
1802
1803 return false;
1804 }
1805
1806 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1807 int r;
1808
1809 assert(link);
1810
1811 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1812 return 1;
1813
1814 r = sd_netlink_message_get_errno(m);
1815 if (r < 0)
1816 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1817
1818 return 1;
1819 }
1820
1821 static int link_configure_addrgen_mode(Link *link) {
1822 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1823 uint8_t ipv6ll_mode;
1824 int r;
1825
1826 assert(link);
1827 assert(link->network);
1828 assert(link->manager);
1829 assert(link->manager->rtnl);
1830
1831 log_link_debug(link, "Setting address genmode for link");
1832
1833 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1834 if (r < 0)
1835 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1836
1837 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1838 if (r < 0)
1839 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1840
1841 r = sd_netlink_message_open_container(req, AF_INET6);
1842 if (r < 0)
1843 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1844
1845 if (!link_ipv6ll_enabled(link))
1846 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1847 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1848 /* The file may not exist. And event if it exists, when stable_secret is unset,
1849 * reading the file fails with EIO. */
1850 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1851 else
1852 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1853
1854 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1855 if (r < 0)
1856 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1857
1858 r = sd_netlink_message_close_container(req);
1859 if (r < 0)
1860 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1861
1862 r = sd_netlink_message_close_container(req);
1863 if (r < 0)
1864 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1865
1866 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1867 link_netlink_destroy_callback, link);
1868 if (r < 0)
1869 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1870
1871 link_ref(link);
1872
1873 return 0;
1874 }
1875
1876 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1877 int r;
1878
1879 assert(link);
1880
1881 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1882 return 1;
1883
1884 r = sd_netlink_message_get_errno(m);
1885 if (r < 0)
1886 /* we warn but don't fail the link, as it may be brought up later */
1887 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1888
1889 return 1;
1890 }
1891
1892 static int link_up(Link *link) {
1893 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1894 int r;
1895
1896 assert(link);
1897 assert(link->network);
1898 assert(link->manager);
1899 assert(link->manager->rtnl);
1900
1901 log_link_debug(link, "Bringing link up");
1902
1903 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1904 if (r < 0)
1905 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1906
1907 /* set it free if not enslaved with networkd */
1908 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1909 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1910 if (r < 0)
1911 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1912 }
1913
1914 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1915 if (r < 0)
1916 return log_link_error_errno(link, r, "Could not set link flags: %m");
1917
1918 if (link->network->mac) {
1919 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1920 if (r < 0)
1921 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1922 }
1923
1924 if (link_ipv6_enabled(link)) {
1925 uint8_t ipv6ll_mode;
1926
1927 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1928 if (r < 0)
1929 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1930
1931 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
1932 r = sd_netlink_message_open_container(req, AF_INET6);
1933 if (r < 0)
1934 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1935
1936 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
1937 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
1938 if (r < 0)
1939 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
1940 }
1941
1942 if (!link_ipv6ll_enabled(link))
1943 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1944 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1945 /* The file may not exist. And event if it exists, when stable_secret is unset,
1946 * reading the file fails with EIO. */
1947 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1948 else
1949 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1950
1951 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1952 if (r < 0)
1953 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1954
1955 r = sd_netlink_message_close_container(req);
1956 if (r < 0)
1957 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1958
1959 r = sd_netlink_message_close_container(req);
1960 if (r < 0)
1961 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1962 }
1963
1964 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1965 link_netlink_destroy_callback, link);
1966 if (r < 0)
1967 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1968
1969 link_ref(link);
1970
1971 return 0;
1972 }
1973
1974 static int link_up_can(Link *link) {
1975 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1976 int r;
1977
1978 assert(link);
1979
1980 log_link_debug(link, "Bringing CAN link up");
1981
1982 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1983 if (r < 0)
1984 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1985
1986 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1987 if (r < 0)
1988 return log_link_error_errno(link, r, "Could not set link flags: %m");
1989
1990 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1991 link_netlink_destroy_callback, link);
1992 if (r < 0)
1993 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1994
1995 link_ref(link);
1996
1997 return 0;
1998 }
1999
2000 static int link_set_can(Link *link) {
2001 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
2002 int r;
2003
2004 assert(link);
2005 assert(link->network);
2006 assert(link->manager);
2007 assert(link->manager->rtnl);
2008
2009 log_link_debug(link, "link_set_can");
2010
2011 r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
2012 if (r < 0)
2013 return log_link_error_errno(link, r, "Failed to allocate netlink message: %m");
2014
2015 r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
2016 if (r < 0)
2017 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
2018
2019 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
2020 if (r < 0)
2021 return log_link_error_errno(link, r, "Failed to open netlink container: %m");
2022
2023 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
2024 if (r < 0)
2025 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
2026
2027 if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) {
2028 struct can_bittiming bt = {
2029 .bitrate = link->network->can_bitrate,
2030 .sample_point = link->network->can_sample_point,
2031 };
2032
2033 if (link->network->can_bitrate > UINT32_MAX) {
2034 log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate);
2035 return -ERANGE;
2036 }
2037
2038 log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate);
2039 if (link->network->can_sample_point > 0)
2040 log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
2041 else
2042 log_link_debug(link, "Using default sample point");
2043
2044 r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
2045 if (r < 0)
2046 return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
2047 }
2048
2049 if (link->network->can_restart_us > 0) {
2050 char time_string[FORMAT_TIMESPAN_MAX];
2051 uint64_t restart_ms;
2052
2053 if (link->network->can_restart_us == USEC_INFINITY)
2054 restart_ms = 0;
2055 else
2056 restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC);
2057
2058 format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC);
2059
2060 if (restart_ms > UINT32_MAX) {
2061 log_link_error(link, "restart timeout (%s) too big.", time_string);
2062 return -ERANGE;
2063 }
2064
2065 log_link_debug(link, "Setting restart = %s", time_string);
2066
2067 r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
2068 if (r < 0)
2069 return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
2070 }
2071
2072 if (link->network->can_triple_sampling >= 0) {
2073 struct can_ctrlmode cm = {
2074 .mask = CAN_CTRLMODE_3_SAMPLES,
2075 .flags = link->network->can_triple_sampling ? CAN_CTRLMODE_3_SAMPLES : 0,
2076 };
2077
2078 log_link_debug(link, "%sabling triple-sampling", link->network->can_triple_sampling ? "En" : "Dis");
2079
2080 r = sd_netlink_message_append_data(m, IFLA_CAN_CTRLMODE, &cm, sizeof(cm));
2081 if (r < 0)
2082 return log_link_error_errno(link, r, "Could not append IFLA_CAN_CTRLMODE attribute: %m");
2083 }
2084
2085 r = sd_netlink_message_close_container(m);
2086 if (r < 0)
2087 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2088
2089 r = sd_netlink_message_close_container(m);
2090 if (r < 0)
2091 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2092
2093 r = netlink_call_async(link->manager->rtnl, NULL, m, link_set_handler,
2094 link_netlink_destroy_callback, link);
2095 if (r < 0)
2096 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2097
2098 link_ref(link);
2099
2100 if (!(link->flags & IFF_UP)) {
2101 r = link_up_can(link);
2102 if (r < 0) {
2103 link_enter_failed(link);
2104 return r;
2105 }
2106 }
2107
2108 log_link_debug(link, "link_set_can done");
2109
2110 return r;
2111 }
2112
2113 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2114 int r;
2115
2116 assert(link);
2117
2118 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2119 return 1;
2120
2121 r = sd_netlink_message_get_errno(m);
2122 if (r < 0)
2123 log_link_warning_errno(link, r, "Could not bring down interface: %m");
2124
2125 return 1;
2126 }
2127
2128 int link_down(Link *link, link_netlink_message_handler_t callback) {
2129 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2130 int r;
2131
2132 assert(link);
2133 assert(link->manager);
2134 assert(link->manager->rtnl);
2135
2136 log_link_debug(link, "Bringing link down");
2137
2138 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
2139 RTM_SETLINK, link->ifindex);
2140 if (r < 0)
2141 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2142
2143 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
2144 if (r < 0)
2145 return log_link_error_errno(link, r, "Could not set link flags: %m");
2146
2147 r = netlink_call_async(link->manager->rtnl, NULL, req,
2148 callback ?: link_down_handler,
2149 link_netlink_destroy_callback, link);
2150 if (r < 0)
2151 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2152
2153 link_ref(link);
2154
2155 return 0;
2156 }
2157
2158 static int link_handle_bound_to_list(Link *link) {
2159 Link *l;
2160 Iterator i;
2161 int r;
2162 bool required_up = false;
2163 bool link_is_up = false;
2164
2165 assert(link);
2166
2167 if (hashmap_isempty(link->bound_to_links))
2168 return 0;
2169
2170 if (link->flags & IFF_UP)
2171 link_is_up = true;
2172
2173 HASHMAP_FOREACH (l, link->bound_to_links, i)
2174 if (link_has_carrier(l)) {
2175 required_up = true;
2176 break;
2177 }
2178
2179 if (!required_up && link_is_up) {
2180 r = link_down(link, NULL);
2181 if (r < 0)
2182 return r;
2183 } else if (required_up && !link_is_up) {
2184 r = link_up(link);
2185 if (r < 0)
2186 return r;
2187 }
2188
2189 return 0;
2190 }
2191
2192 static int link_handle_bound_by_list(Link *link) {
2193 Iterator i;
2194 Link *l;
2195 int r;
2196
2197 assert(link);
2198
2199 if (hashmap_isempty(link->bound_by_links))
2200 return 0;
2201
2202 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2203 r = link_handle_bound_to_list(l);
2204 if (r < 0)
2205 return r;
2206 }
2207
2208 return 0;
2209 }
2210
2211 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2212 int r;
2213
2214 assert(link);
2215 assert(carrier);
2216
2217 if (link == carrier)
2218 return 0;
2219
2220 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2221 return 0;
2222
2223 r = hashmap_ensure_allocated(h, NULL);
2224 if (r < 0)
2225 return r;
2226
2227 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2228 if (r < 0)
2229 return r;
2230
2231 return 0;
2232 }
2233
2234 static int link_new_bound_by_list(Link *link) {
2235 Manager *m;
2236 Link *carrier;
2237 Iterator i;
2238 int r;
2239 bool list_updated = false;
2240
2241 assert(link);
2242 assert(link->manager);
2243
2244 m = link->manager;
2245
2246 HASHMAP_FOREACH(carrier, m->links, i) {
2247 if (!carrier->network)
2248 continue;
2249
2250 if (strv_isempty(carrier->network->bind_carrier))
2251 continue;
2252
2253 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2254 r = link_put_carrier(link, carrier, &link->bound_by_links);
2255 if (r < 0)
2256 return r;
2257
2258 list_updated = true;
2259 }
2260 }
2261
2262 if (list_updated)
2263 link_dirty(link);
2264
2265 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2266 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2267 if (r < 0)
2268 return r;
2269
2270 link_dirty(carrier);
2271 }
2272
2273 return 0;
2274 }
2275
2276 static int link_new_bound_to_list(Link *link) {
2277 Manager *m;
2278 Link *carrier;
2279 Iterator i;
2280 int r;
2281 bool list_updated = false;
2282
2283 assert(link);
2284 assert(link->manager);
2285
2286 if (!link->network)
2287 return 0;
2288
2289 if (strv_isempty(link->network->bind_carrier))
2290 return 0;
2291
2292 m = link->manager;
2293
2294 HASHMAP_FOREACH (carrier, m->links, i) {
2295 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2296 r = link_put_carrier(link, carrier, &link->bound_to_links);
2297 if (r < 0)
2298 return r;
2299
2300 list_updated = true;
2301 }
2302 }
2303
2304 if (list_updated)
2305 link_dirty(link);
2306
2307 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2308 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2309 if (r < 0)
2310 return r;
2311
2312 link_dirty(carrier);
2313 }
2314
2315 return 0;
2316 }
2317
2318 static int link_new_carrier_maps(Link *link) {
2319 int r;
2320
2321 r = link_new_bound_by_list(link);
2322 if (r < 0)
2323 return r;
2324
2325 r = link_handle_bound_by_list(link);
2326 if (r < 0)
2327 return r;
2328
2329 r = link_new_bound_to_list(link);
2330 if (r < 0)
2331 return r;
2332
2333 r = link_handle_bound_to_list(link);
2334 if (r < 0)
2335 return r;
2336
2337 return 0;
2338 }
2339
2340 static void link_free_bound_to_list(Link *link) {
2341 Link *bound_to;
2342 Iterator i;
2343
2344 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2345 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2346
2347 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2348 link_dirty(bound_to);
2349 }
2350
2351 return;
2352 }
2353
2354 static void link_free_bound_by_list(Link *link) {
2355 Link *bound_by;
2356 Iterator i;
2357
2358 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2359 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2360
2361 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2362 link_dirty(bound_by);
2363 link_handle_bound_to_list(bound_by);
2364 }
2365 }
2366
2367 return;
2368 }
2369
2370 static void link_free_carrier_maps(Link *link) {
2371 bool list_updated = false;
2372
2373 assert(link);
2374
2375 if (!hashmap_isempty(link->bound_to_links)) {
2376 link_free_bound_to_list(link);
2377 list_updated = true;
2378 }
2379
2380 if (!hashmap_isempty(link->bound_by_links)) {
2381 link_free_bound_by_list(link);
2382 list_updated = true;
2383 }
2384
2385 if (list_updated)
2386 link_dirty(link);
2387
2388 return;
2389 }
2390
2391 static int link_append_to_master(Link *link, NetDev *netdev) {
2392 Link *master;
2393 int r;
2394
2395 assert(link);
2396 assert(netdev);
2397
2398 r = link_get(link->manager, netdev->ifindex, &master);
2399 if (r < 0)
2400 return r;
2401
2402 r = set_ensure_allocated(&master->slaves, NULL);
2403 if (r < 0)
2404 return r;
2405
2406 r = set_put(master->slaves, link);
2407 if (r < 0)
2408 return r;
2409
2410 link_ref(link);
2411 return 0;
2412 }
2413
2414 static void link_drop_from_master(Link *link, NetDev *netdev) {
2415 Link *master;
2416
2417 assert(link);
2418
2419 if (!link->manager || !netdev)
2420 return;
2421
2422 if (link_get(link->manager, netdev->ifindex, &master) < 0)
2423 return;
2424
2425 link_unref(set_remove(master->slaves, link));
2426 }
2427
2428 static void link_detach_from_manager(Link *link) {
2429 if (!link || !link->manager)
2430 return;
2431
2432 link_unref(set_remove(link->manager->links_requesting_uuid, link));
2433 link_clean(link);
2434
2435 /* The following must be called at last. */
2436 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2437 link_unref(link);
2438 }
2439
2440 void link_drop(Link *link) {
2441 if (!link || link->state == LINK_STATE_LINGER)
2442 return;
2443
2444 link_set_state(link, LINK_STATE_LINGER);
2445
2446 link_free_carrier_maps(link);
2447
2448 if (link->network) {
2449 link_drop_from_master(link, link->network->bridge);
2450 link_drop_from_master(link, link->network->bond);
2451 }
2452
2453 log_link_debug(link, "Link removed");
2454
2455 (void) unlink(link->state_file);
2456 link_detach_from_manager(link);
2457 }
2458
2459 static int link_joined(Link *link) {
2460 int r;
2461
2462 assert(link);
2463 assert(link->network);
2464
2465 if (!hashmap_isempty(link->bound_to_links)) {
2466 r = link_handle_bound_to_list(link);
2467 if (r < 0)
2468 return r;
2469 } else if (!(link->flags & IFF_UP)) {
2470 r = link_up(link);
2471 if (r < 0) {
2472 link_enter_failed(link);
2473 return r;
2474 }
2475 }
2476
2477 if (link->network->bridge) {
2478 r = link_set_bridge(link);
2479 if (r < 0)
2480 log_link_error_errno(link, r, "Could not set bridge message: %m");
2481
2482 r = link_append_to_master(link, link->network->bridge);
2483 if (r < 0)
2484 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2485 }
2486
2487 if (link->network->bond) {
2488 r = link_set_bond(link);
2489 if (r < 0)
2490 log_link_error_errno(link, r, "Could not set bond message: %m");
2491
2492 r = link_append_to_master(link, link->network->bond);
2493 if (r < 0)
2494 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2495 }
2496
2497 if (link->network->use_br_vlan &&
2498 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2499 r = link_set_bridge_vlan(link);
2500 if (r < 0)
2501 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2502 }
2503
2504 /* Skip setting up addresses until it gets carrier,
2505 or it would try to set addresses twice,
2506 which is bad for non-idempotent steps. */
2507 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2508 return 0;
2509
2510 return link_request_set_addresses(link);
2511 }
2512
2513 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2514 int r;
2515
2516 assert(link);
2517 assert(link->network);
2518 assert(link->enslaving > 0);
2519 assert(!link->enslaved_raw);
2520
2521 link->enslaving--;
2522
2523 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2524 return 1;
2525
2526 r = sd_netlink_message_get_errno(m);
2527 if (r < 0 && r != -EEXIST) {
2528 log_link_error_errno(link, r, "Could not join netdev: %m");
2529 link_enter_failed(link);
2530 return 1;
2531 } else
2532 log_link_debug(link, "Joined netdev");
2533
2534 if (link->enslaving == 0) {
2535 link->enslaved_raw = true;
2536 link_joined(link);
2537 }
2538
2539 return 1;
2540 }
2541
2542 static int link_enter_join_netdev(Link *link) {
2543 NetDev *netdev;
2544 Iterator i;
2545 int r;
2546
2547 assert(link);
2548 assert(link->network);
2549 assert(link->state == LINK_STATE_INITIALIZED);
2550
2551 link_set_state(link, LINK_STATE_CONFIGURING);
2552
2553 link_dirty(link);
2554 link->enslaving = 0;
2555 link->enslaved_raw = false;
2556
2557 if (link->network->bond) {
2558 if (link->network->bond->state == NETDEV_STATE_READY &&
2559 link->network->bond->ifindex == link->master_ifindex)
2560 return link_joined(link);
2561
2562 log_struct(LOG_DEBUG,
2563 LOG_LINK_INTERFACE(link),
2564 LOG_NETDEV_INTERFACE(link->network->bond),
2565 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2566
2567 link->enslaving++;
2568
2569 r = netdev_join(link->network->bond, link, netdev_join_handler);
2570 if (r < 0) {
2571 log_struct_errno(LOG_WARNING, r,
2572 LOG_LINK_INTERFACE(link),
2573 LOG_NETDEV_INTERFACE(link->network->bond),
2574 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2575 link_enter_failed(link);
2576 return r;
2577 }
2578 }
2579
2580 if (link->network->bridge) {
2581 log_struct(LOG_DEBUG,
2582 LOG_LINK_INTERFACE(link),
2583 LOG_NETDEV_INTERFACE(link->network->bridge),
2584 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2585
2586 link->enslaving++;
2587
2588 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2589 if (r < 0) {
2590 log_struct_errno(LOG_WARNING, r,
2591 LOG_LINK_INTERFACE(link),
2592 LOG_NETDEV_INTERFACE(link->network->bridge),
2593 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2594 link_enter_failed(link);
2595 return r;
2596 }
2597 }
2598
2599 if (link->network->vrf) {
2600 log_struct(LOG_DEBUG,
2601 LOG_LINK_INTERFACE(link),
2602 LOG_NETDEV_INTERFACE(link->network->vrf),
2603 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2604
2605 link->enslaving++;
2606
2607 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2608 if (r < 0) {
2609 log_struct_errno(LOG_WARNING, r,
2610 LOG_LINK_INTERFACE(link),
2611 LOG_NETDEV_INTERFACE(link->network->vrf),
2612 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2613 link_enter_failed(link);
2614 return r;
2615 }
2616 }
2617
2618 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2619
2620 if (netdev->ifindex > 0)
2621 /* Assume already enslaved. */
2622 continue;
2623
2624 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2625 continue;
2626
2627 log_struct(LOG_DEBUG,
2628 LOG_LINK_INTERFACE(link),
2629 LOG_NETDEV_INTERFACE(netdev),
2630 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2631
2632 link->enslaving++;
2633
2634 r = netdev_join(netdev, link, netdev_join_handler);
2635 if (r < 0) {
2636 log_struct_errno(LOG_WARNING, r,
2637 LOG_LINK_INTERFACE(link),
2638 LOG_NETDEV_INTERFACE(netdev),
2639 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2640 link_enter_failed(link);
2641 return r;
2642 }
2643 }
2644
2645 if (link->enslaving == 0)
2646 return link_joined(link);
2647
2648 return 0;
2649 }
2650
2651 static int link_set_ipv4_forward(Link *link) {
2652 int r;
2653
2654 if (!link_ipv4_forward_enabled(link))
2655 return 0;
2656
2657 /* We propagate the forwarding flag from one interface to the
2658 * global setting one way. This means: as long as at least one
2659 * interface was configured at any time that had IP forwarding
2660 * enabled the setting will stay on for good. We do this
2661 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2662 * somewhat in sync (see below). */
2663
2664 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2665 if (r < 0)
2666 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2667
2668 return 0;
2669 }
2670
2671 static int link_set_ipv6_forward(Link *link) {
2672 int r;
2673
2674 if (!link_ipv6_forward_enabled(link))
2675 return 0;
2676
2677 /* On Linux, the IPv6 stack does not know a per-interface
2678 * packet forwarding setting: either packet forwarding is on
2679 * for all, or off for all. We hence don't bother with a
2680 * per-interface setting, but simply propagate the interface
2681 * flag, if it is set, to the global flag, one-way. Note that
2682 * while IPv4 would allow a per-interface flag, we expose the
2683 * same behaviour there and also propagate the setting from
2684 * one to all, to keep things simple (see above). */
2685
2686 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2687 if (r < 0)
2688 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2689
2690 return 0;
2691 }
2692
2693 static int link_set_ipv6_privacy_extensions(Link *link) {
2694 IPv6PrivacyExtensions s;
2695 int r;
2696
2697 s = link_ipv6_privacy_extensions(link);
2698 if (s < 0)
2699 return 0;
2700
2701 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2702 if (r < 0)
2703 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2704
2705 return 0;
2706 }
2707
2708 static int link_set_ipv6_accept_ra(Link *link) {
2709 int r;
2710
2711 /* Make this a NOP if IPv6 is not available */
2712 if (!socket_ipv6_is_supported())
2713 return 0;
2714
2715 if (link->flags & IFF_LOOPBACK)
2716 return 0;
2717
2718 if (!link->network)
2719 return 0;
2720
2721 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2722 if (r < 0)
2723 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2724
2725 return 0;
2726 }
2727
2728 static int link_set_ipv6_dad_transmits(Link *link) {
2729 int r;
2730
2731 /* Make this a NOP if IPv6 is not available */
2732 if (!socket_ipv6_is_supported())
2733 return 0;
2734
2735 if (link->flags & IFF_LOOPBACK)
2736 return 0;
2737
2738 if (!link->network)
2739 return 0;
2740
2741 if (link->network->ipv6_dad_transmits < 0)
2742 return 0;
2743
2744 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2745 if (r < 0)
2746 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2747
2748 return 0;
2749 }
2750
2751 static int link_set_ipv6_hop_limit(Link *link) {
2752 int r;
2753
2754 /* Make this a NOP if IPv6 is not available */
2755 if (!socket_ipv6_is_supported())
2756 return 0;
2757
2758 if (link->flags & IFF_LOOPBACK)
2759 return 0;
2760
2761 if (!link->network)
2762 return 0;
2763
2764 if (link->network->ipv6_hop_limit < 0)
2765 return 0;
2766
2767 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2768 if (r < 0)
2769 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2770
2771 return 0;
2772 }
2773
2774 static int link_set_ipv6_mtu(Link *link) {
2775 int r;
2776
2777 /* Make this a NOP if IPv6 is not available */
2778 if (!socket_ipv6_is_supported())
2779 return 0;
2780
2781 if (link->flags & IFF_LOOPBACK)
2782 return 0;
2783
2784 if (link->network->ipv6_mtu == 0)
2785 return 0;
2786
2787 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2788 if (r < 0)
2789 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2790
2791 return 0;
2792 }
2793
2794 static bool link_is_static_address_configured(Link *link, Address *address) {
2795 Address *net_address;
2796
2797 assert(link);
2798 assert(address);
2799
2800 if (!link->network)
2801 return false;
2802
2803 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2804 if (address_equal(net_address, address))
2805 return true;
2806
2807 return false;
2808 }
2809
2810 static bool link_is_static_route_configured(Link *link, Route *route) {
2811 Route *net_route;
2812
2813 assert(link);
2814 assert(route);
2815
2816 if (!link->network)
2817 return false;
2818
2819 LIST_FOREACH(routes, net_route, link->network->static_routes)
2820 if (route_equal(net_route, route))
2821 return true;
2822
2823 return false;
2824 }
2825
2826 static int link_drop_foreign_config(Link *link) {
2827 Address *address;
2828 Route *route;
2829 Iterator i;
2830 int r;
2831
2832 SET_FOREACH(address, link->addresses_foreign, i) {
2833 /* we consider IPv6LL addresses to be managed by the kernel */
2834 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2835 continue;
2836
2837 if (link_is_static_address_configured(link, address)) {
2838 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2839 if (r < 0)
2840 return log_link_error_errno(link, r, "Failed to add address: %m");
2841 } else {
2842 r = address_remove(address, link, NULL);
2843 if (r < 0)
2844 return r;
2845 }
2846 }
2847
2848 SET_FOREACH(route, link->routes_foreign, i) {
2849 /* do not touch routes managed by the kernel */
2850 if (route->protocol == RTPROT_KERNEL)
2851 continue;
2852
2853 if (link_is_static_route_configured(link, route)) {
2854 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2855 if (r < 0)
2856 return r;
2857 } else {
2858 r = route_remove(route, link, NULL);
2859 if (r < 0)
2860 return r;
2861 }
2862 }
2863
2864 return 0;
2865 }
2866
2867 static int link_drop_config(Link *link) {
2868 Address *address, *pool_address;
2869 Route *route;
2870 Iterator i;
2871 int r;
2872
2873 SET_FOREACH(address, link->addresses, i) {
2874 /* we consider IPv6LL addresses to be managed by the kernel */
2875 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2876 continue;
2877
2878 r = address_remove(address, link, NULL);
2879 if (r < 0)
2880 return r;
2881
2882 /* If this address came from an address pool, clean up the pool */
2883 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2884 if (address_equal(address, pool_address)) {
2885 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2886 address_free(pool_address);
2887 break;
2888 }
2889 }
2890 }
2891
2892 SET_FOREACH(route, link->routes, i) {
2893 /* do not touch routes managed by the kernel */
2894 if (route->protocol == RTPROT_KERNEL)
2895 continue;
2896
2897 r = route_remove(route, link, NULL);
2898 if (r < 0)
2899 return r;
2900 }
2901
2902 ndisc_flush(link);
2903
2904 return 0;
2905 }
2906
2907 static int can_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2908 int r;
2909
2910 assert(link);
2911
2912 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2913 return 1;
2914
2915 r = sd_netlink_message_get_errno(m);
2916 if (r < 0) {
2917 log_link_warning_errno(link, r, "Could not bring down interface: %m");
2918 link_enter_failed(link);
2919 return 1;
2920 }
2921
2922 r = link_set_can(link);
2923 if (r < 0)
2924 link_enter_failed(link);
2925
2926 return 1;
2927 }
2928
2929 static int link_configure_can(Link *link) {
2930 int r;
2931
2932 if (streq_ptr(link->kind, "can")) {
2933 /* The CAN interface must be down to configure bitrate, etc... */
2934 if ((link->flags & IFF_UP)) {
2935 r = link_down(link, can_down_handler);
2936 if (r < 0) {
2937 link_enter_failed(link);
2938 return r;
2939 }
2940
2941 return 0;
2942 }
2943
2944 return link_set_can(link);
2945 }
2946
2947 if (!(link->flags & IFF_UP)) {
2948 r = link_up_can(link);
2949 if (r < 0) {
2950 link_enter_failed(link);
2951 return r;
2952 }
2953 }
2954
2955 return 0;
2956 }
2957
2958 static int link_configure(Link *link) {
2959 int r;
2960
2961 assert(link);
2962 assert(link->network);
2963 assert(link->state == LINK_STATE_INITIALIZED);
2964
2965 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
2966 return link_configure_can(link);
2967
2968 /* Drop foreign config, but ignore loopback or critical devices.
2969 * We do not want to remove loopback address or addresses used for root NFS. */
2970 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2971 r = link_drop_foreign_config(link);
2972 if (r < 0)
2973 return r;
2974 }
2975
2976 r = link_set_proxy_arp(link);
2977 if (r < 0)
2978 return r;
2979
2980 r = ipv6_proxy_ndp_addresses_configure(link);
2981 if (r < 0)
2982 return r;
2983
2984 r = link_set_ipv4_forward(link);
2985 if (r < 0)
2986 return r;
2987
2988 r = link_set_ipv6_forward(link);
2989 if (r < 0)
2990 return r;
2991
2992 r = link_set_ipv6_privacy_extensions(link);
2993 if (r < 0)
2994 return r;
2995
2996 r = link_set_ipv6_accept_ra(link);
2997 if (r < 0)
2998 return r;
2999
3000 r = link_set_ipv6_dad_transmits(link);
3001 if (r < 0)
3002 return r;
3003
3004 r = link_set_ipv6_hop_limit(link);
3005 if (r < 0)
3006 return r;
3007
3008 r = link_set_flags(link);
3009 if (r < 0)
3010 return r;
3011
3012 r = link_set_ipv6_mtu(link);
3013 if (r < 0)
3014 return r;
3015
3016 if (link_ipv4ll_enabled(link) || link_ipv4ll_fallback_enabled(link)) {
3017 r = ipv4ll_configure(link);
3018 if (r < 0)
3019 return r;
3020 }
3021
3022 if (link_dhcp4_enabled(link)) {
3023 r = dhcp4_set_promote_secondaries(link);
3024 if (r < 0)
3025 return r;
3026
3027 r = dhcp4_configure(link);
3028 if (r < 0)
3029 return r;
3030 }
3031
3032 if (link_dhcp4_server_enabled(link)) {
3033 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
3034 if (r < 0)
3035 return r;
3036
3037 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
3038 if (r < 0)
3039 return r;
3040 }
3041
3042 if (link_dhcp6_enabled(link) ||
3043 link_ipv6_accept_ra_enabled(link)) {
3044 r = dhcp6_configure(link);
3045 if (r < 0)
3046 return r;
3047 }
3048
3049 if (link_ipv6_accept_ra_enabled(link)) {
3050 r = ndisc_configure(link);
3051 if (r < 0)
3052 return r;
3053 }
3054
3055 if (link_radv_enabled(link)) {
3056 r = radv_configure(link);
3057 if (r < 0)
3058 return r;
3059 }
3060
3061 if (link_lldp_rx_enabled(link)) {
3062 r = link_lldp_rx_configure(link);
3063 if (r < 0)
3064 return r;
3065 }
3066
3067 r = link_set_mtu(link, link->network->mtu, link->network->mtu_is_set);
3068 if (r < 0)
3069 return r;
3070
3071 if (socket_ipv6_is_supported()) {
3072 r = link_configure_addrgen_mode(link);
3073 if (r < 0)
3074 return r;
3075 }
3076
3077 return link_configure_after_setting_mtu(link);
3078 }
3079
3080 static int link_configure_after_setting_mtu(Link *link) {
3081 int r;
3082
3083 assert(link);
3084 assert(link->network);
3085 assert(link->state == LINK_STATE_INITIALIZED);
3086
3087 if (link->setting_mtu)
3088 return 0;
3089
3090 if (link_has_carrier(link) || link->network->configure_without_carrier) {
3091 r = link_acquire_conf(link);
3092 if (r < 0)
3093 return r;
3094 }
3095
3096 return link_enter_join_netdev(link);
3097 }
3098
3099 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3100 assert(duid);
3101
3102 if (duid->raw_data_len > 0)
3103 return 0;
3104
3105 if (duid->type != DUID_TYPE_UUID)
3106 return -EINVAL;
3107
3108 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3109 duid->raw_data_len = sizeof(sd_id128_t);
3110
3111 return 1;
3112 }
3113
3114 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3115 Manager *manager = userdata;
3116 const sd_bus_error *e;
3117 const void *a;
3118 size_t sz;
3119 DUID *duid;
3120 Link *link;
3121 int r;
3122
3123 assert(m);
3124 assert(manager);
3125
3126 e = sd_bus_message_get_error(m);
3127 if (e) {
3128 log_error_errno(sd_bus_error_get_errno(e),
3129 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3130 e->message);
3131 goto configure;
3132 }
3133
3134 r = sd_bus_message_read_array(m, 'y', &a, &sz);
3135 if (r < 0)
3136 goto configure;
3137
3138 if (sz != sizeof(sd_id128_t)) {
3139 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3140 goto configure;
3141 }
3142
3143 memcpy(&manager->product_uuid, a, sz);
3144 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3145 (void) duid_set_uuid(duid, manager->product_uuid);
3146
3147 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3148
3149 configure:
3150 while ((link = set_steal_first(manager->links_requesting_uuid))) {
3151 r = link_configure(link);
3152 if (r < 0)
3153 log_link_error_errno(link, r, "Failed to configure link: %m");
3154 }
3155
3156 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3157
3158 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3159 * even if the method fails. */
3160 manager->has_product_uuid = true;
3161
3162 return 1;
3163 }
3164
3165 static bool link_requires_uuid(Link *link) {
3166 const DUID *duid;
3167
3168 assert(link);
3169 assert(link->manager);
3170 assert(link->network);
3171
3172 duid = link_get_duid(link);
3173 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3174 return false;
3175
3176 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3177 return true;
3178
3179 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3180 return true;
3181
3182 return false;
3183 }
3184
3185 static int link_configure_duid(Link *link) {
3186 Manager *m;
3187 DUID *duid;
3188 int r;
3189
3190 assert(link);
3191 assert(link->manager);
3192 assert(link->network);
3193
3194 m = link->manager;
3195 duid = link_get_duid(link);
3196
3197 if (!link_requires_uuid(link))
3198 return 1;
3199
3200 if (m->has_product_uuid) {
3201 (void) duid_set_uuid(duid, m->product_uuid);
3202 return 1;
3203 }
3204
3205 if (!m->links_requesting_uuid) {
3206 r = manager_request_product_uuid(m, link);
3207 if (r < 0) {
3208 if (r == -ENOMEM)
3209 return r;
3210
3211 log_link_warning_errno(link, r,
3212 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3213 return 1;
3214 }
3215 } else {
3216 r = set_put(m->links_requesting_uuid, link);
3217 if (r < 0)
3218 return log_oom();
3219
3220 r = set_put(m->duids_requesting_uuid, duid);
3221 if (r < 0)
3222 return log_oom();
3223 }
3224
3225 return 0;
3226 }
3227
3228 static int link_initialized_and_synced(Link *link) {
3229 Network *network;
3230 int r;
3231
3232 assert(link);
3233 assert(link->ifname);
3234 assert(link->manager);
3235
3236 /* We may get called either from the asynchronous netlink callback,
3237 * or directly for link_add() if running in a container. See link_add(). */
3238 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3239 return 0;
3240
3241 log_link_debug(link, "Link state is up-to-date");
3242 link_set_state(link, LINK_STATE_INITIALIZED);
3243
3244 r = link_new_bound_by_list(link);
3245 if (r < 0)
3246 return r;
3247
3248 r = link_handle_bound_by_list(link);
3249 if (r < 0)
3250 return r;
3251
3252 if (!link->network) {
3253 r = network_get(link->manager, link->sd_device, link->ifname,
3254 &link->mac, &network);
3255 if (r == -ENOENT) {
3256 link_enter_unmanaged(link);
3257 return 0;
3258 } else if (r == 0 && network->unmanaged) {
3259 link_enter_unmanaged(link);
3260 return 0;
3261 } else if (r < 0)
3262 return r;
3263
3264 if (link->flags & IFF_LOOPBACK) {
3265 if (network->link_local != ADDRESS_FAMILY_NO)
3266 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3267
3268 if (network->dhcp != ADDRESS_FAMILY_NO)
3269 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3270
3271 if (network->dhcp_server)
3272 log_link_debug(link, "Ignoring DHCP server for loopback link");
3273 }
3274
3275 r = network_apply(network, link);
3276 if (r < 0)
3277 return r;
3278 }
3279
3280 r = link_new_bound_to_list(link);
3281 if (r < 0)
3282 return r;
3283
3284 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3285 * link_configure() is called later asynchronously. */
3286 r = link_configure_duid(link);
3287 if (r <= 0)
3288 return r;
3289
3290 r = link_configure(link);
3291 if (r < 0)
3292 return r;
3293
3294 return 0;
3295 }
3296
3297 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3298 (void) link_initialized_and_synced(link);
3299 return 1;
3300 }
3301
3302 int link_initialized(Link *link, sd_device *device) {
3303 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3304 int r;
3305
3306 assert(link);
3307 assert(link->manager);
3308 assert(link->manager->rtnl);
3309 assert(device);
3310
3311 if (link->state != LINK_STATE_PENDING)
3312 return 0;
3313
3314 if (link->sd_device)
3315 return 0;
3316
3317 log_link_debug(link, "udev initialized link");
3318 link_set_state(link, LINK_STATE_INITIALIZED);
3319
3320 link->sd_device = sd_device_ref(device);
3321
3322 /* udev has initialized the link, but we don't know if we have yet
3323 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3324 * when it returns we know that the pending NEWLINKs have already been
3325 * processed and that we are up-to-date */
3326
3327 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3328 link->ifindex);
3329 if (r < 0)
3330 return r;
3331
3332 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3333 link_netlink_destroy_callback, link);
3334 if (r < 0)
3335 return r;
3336
3337 link_ref(link);
3338
3339 return 0;
3340 }
3341
3342 static int link_load(Link *link) {
3343 _cleanup_free_ char *network_file = NULL,
3344 *addresses = NULL,
3345 *routes = NULL,
3346 *dhcp4_address = NULL,
3347 *ipv4ll_address = NULL;
3348 union in_addr_union address;
3349 union in_addr_union route_dst;
3350 const char *p;
3351 int r;
3352
3353 assert(link);
3354
3355 r = parse_env_file(NULL, link->state_file,
3356 "NETWORK_FILE", &network_file,
3357 "ADDRESSES", &addresses,
3358 "ROUTES", &routes,
3359 "DHCP4_ADDRESS", &dhcp4_address,
3360 "IPV4LL_ADDRESS", &ipv4ll_address);
3361 if (r < 0 && r != -ENOENT)
3362 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3363
3364 if (network_file) {
3365 Network *network;
3366 char *suffix;
3367
3368 /* drop suffix */
3369 suffix = strrchr(network_file, '.');
3370 if (!suffix) {
3371 log_link_debug(link, "Failed to get network name from %s", network_file);
3372 goto network_file_fail;
3373 }
3374 *suffix = '\0';
3375
3376 r = network_get_by_name(link->manager, basename(network_file), &network);
3377 if (r < 0) {
3378 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3379 goto network_file_fail;
3380 }
3381
3382 r = network_apply(network, link);
3383 if (r < 0)
3384 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3385 }
3386
3387 network_file_fail:
3388
3389 if (addresses) {
3390 p = addresses;
3391
3392 for (;;) {
3393 _cleanup_free_ char *address_str = NULL;
3394 char *prefixlen_str;
3395 int family;
3396 unsigned char prefixlen;
3397
3398 r = extract_first_word(&p, &address_str, NULL, 0);
3399 if (r < 0) {
3400 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3401 continue;
3402 }
3403 if (r == 0)
3404 break;
3405
3406 prefixlen_str = strchr(address_str, '/');
3407 if (!prefixlen_str) {
3408 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3409 continue;
3410 }
3411
3412 *prefixlen_str++ = '\0';
3413
3414 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3415 if (r != 1) {
3416 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3417 continue;
3418 }
3419
3420 r = in_addr_from_string_auto(address_str, &family, &address);
3421 if (r < 0) {
3422 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3423 continue;
3424 }
3425
3426 r = address_add(link, family, &address, prefixlen, NULL);
3427 if (r < 0)
3428 return log_link_error_errno(link, r, "Failed to add address: %m");
3429 }
3430 }
3431
3432 if (routes) {
3433 p = routes;
3434
3435 for (;;) {
3436 Route *route;
3437 _cleanup_free_ char *route_str = NULL;
3438 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3439 usec_t lifetime;
3440 char *prefixlen_str;
3441 int family;
3442 unsigned char prefixlen, tos, table;
3443 uint32_t priority;
3444
3445 r = extract_first_word(&p, &route_str, NULL, 0);
3446 if (r < 0) {
3447 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3448 continue;
3449 }
3450 if (r == 0)
3451 break;
3452
3453 prefixlen_str = strchr(route_str, '/');
3454 if (!prefixlen_str) {
3455 log_link_debug(link, "Failed to parse route %s", route_str);
3456 continue;
3457 }
3458
3459 *prefixlen_str++ = '\0';
3460
3461 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3462 if (r != 5) {
3463 log_link_debug(link,
3464 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3465 prefixlen_str);
3466 continue;
3467 }
3468
3469 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3470 if (r < 0) {
3471 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3472 continue;
3473 }
3474
3475 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3476 if (r < 0)
3477 return log_link_error_errno(link, r, "Failed to add route: %m");
3478
3479 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3480 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3481 0, route_expire_handler, route);
3482 if (r < 0)
3483 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3484 }
3485
3486 route->lifetime = lifetime;
3487 sd_event_source_unref(route->expire);
3488 route->expire = TAKE_PTR(expire);
3489 }
3490 }
3491
3492 if (dhcp4_address) {
3493 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3494 if (r < 0) {
3495 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3496 goto dhcp4_address_fail;
3497 }
3498
3499 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3500 if (r < 0)
3501 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3502
3503 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3504 if (r < 0)
3505 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3506 }
3507
3508 dhcp4_address_fail:
3509
3510 if (ipv4ll_address) {
3511 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3512 if (r < 0) {
3513 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3514 goto ipv4ll_address_fail;
3515 }
3516
3517 r = sd_ipv4ll_new(&link->ipv4ll);
3518 if (r < 0)
3519 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3520
3521 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3522 if (r < 0)
3523 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3524 }
3525
3526 ipv4ll_address_fail:
3527
3528 return 0;
3529 }
3530
3531 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3532 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3533 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3534 Link *link;
3535 int r;
3536
3537 assert(m);
3538 assert(m->rtnl);
3539 assert(message);
3540 assert(ret);
3541
3542 r = link_new(m, message, ret);
3543 if (r < 0)
3544 return r;
3545
3546 link = *ret;
3547
3548 log_link_debug(link, "Link %d added", link->ifindex);
3549
3550 r = link_load(link);
3551 if (r < 0)
3552 return r;
3553
3554 if (detect_container() <= 0) {
3555 /* not in a container, udev will be around */
3556 sprintf(ifindex_str, "n%d", link->ifindex);
3557 r = sd_device_new_from_device_id(&device, ifindex_str);
3558 if (r < 0) {
3559 log_link_warning_errno(link, r, "Could not find device: %m");
3560 goto failed;
3561 }
3562
3563 r = sd_device_get_is_initialized(device);
3564 if (r < 0) {
3565 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3566 goto failed;
3567 }
3568 if (r == 0) {
3569 /* not yet ready */
3570 log_link_debug(link, "link pending udev initialization...");
3571 return 0;
3572 }
3573
3574 r = device_is_renaming(device);
3575 if (r < 0) {
3576 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3577 goto failed;
3578 }
3579 if (r > 0) {
3580 log_link_debug(link, "Interface is under renaming, pending initialization.");
3581 return 0;
3582 }
3583
3584 r = link_initialized(link, device);
3585 if (r < 0)
3586 goto failed;
3587 } else {
3588 r = link_initialized_and_synced(link);
3589 if (r < 0)
3590 goto failed;
3591 }
3592
3593 return 0;
3594 failed:
3595 link_enter_failed(link);
3596 return r;
3597 }
3598
3599 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3600 int r;
3601
3602 assert(link);
3603
3604 log_link_info(link, "Gained IPv6LL");
3605
3606 link->ipv6ll_address = *address;
3607 link_check_ready(link);
3608
3609 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3610 r = link_acquire_ipv6_conf(link);
3611 if (r < 0) {
3612 link_enter_failed(link);
3613 return r;
3614 }
3615 }
3616
3617 return 0;
3618 }
3619
3620 static int link_carrier_gained(Link *link) {
3621 int r;
3622
3623 assert(link);
3624
3625 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3626 r = link_acquire_conf(link);
3627 if (r < 0) {
3628 link_enter_failed(link);
3629 return r;
3630 }
3631
3632 r = link_request_set_addresses(link);
3633 if (r < 0)
3634 return r;
3635 }
3636
3637 r = link_handle_bound_by_list(link);
3638 if (r < 0)
3639 return r;
3640
3641 return 0;
3642 }
3643
3644 static int link_carrier_lost(Link *link) {
3645 int r;
3646
3647 assert(link);
3648
3649 if (link->network && link->network->ignore_carrier_loss)
3650 return 0;
3651
3652 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3653 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3654 * configuration and stop the clients as well. */
3655 if (link->setting_mtu)
3656 return 0;
3657
3658 r = link_stop_clients(link);
3659 if (r < 0) {
3660 link_enter_failed(link);
3661 return r;
3662 }
3663
3664 if (link_dhcp4_server_enabled(link))
3665 (void) sd_dhcp_server_stop(link->dhcp_server);
3666
3667 r = link_drop_config(link);
3668 if (r < 0)
3669 return r;
3670
3671 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3672 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3673 r = link_drop_foreign_config(link);
3674 if (r < 0)
3675 return r;
3676 }
3677
3678 r = link_handle_bound_by_list(link);
3679 if (r < 0)
3680 return r;
3681
3682 return 0;
3683 }
3684
3685 int link_carrier_reset(Link *link) {
3686 int r;
3687
3688 assert(link);
3689
3690 if (link_has_carrier(link)) {
3691 r = link_carrier_lost(link);
3692 if (r < 0)
3693 return r;
3694
3695 r = link_carrier_gained(link);
3696 if (r < 0)
3697 return r;
3698
3699 log_link_info(link, "Reset carrier");
3700 }
3701
3702 return 0;
3703 }
3704
3705 int link_update(Link *link, sd_netlink_message *m) {
3706 struct ether_addr mac;
3707 const char *ifname;
3708 uint32_t mtu;
3709 bool had_carrier, carrier_gained, carrier_lost;
3710 int r;
3711
3712 assert(link);
3713 assert(link->ifname);
3714 assert(m);
3715
3716 if (link->state == LINK_STATE_LINGER) {
3717 log_link_info(link, "Link re-added");
3718 link_set_state(link, LINK_STATE_CONFIGURING);
3719
3720 r = link_new_carrier_maps(link);
3721 if (r < 0)
3722 return r;
3723 }
3724
3725 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3726 if (r >= 0 && !streq(ifname, link->ifname)) {
3727 Manager *manager = link->manager;
3728
3729 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3730
3731 link_drop(link);
3732 r = link_add(manager, m, &link);
3733 if (r < 0)
3734 return r;
3735 }
3736
3737 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3738 if (r >= 0 && mtu > 0) {
3739 link->mtu = mtu;
3740 if (link->original_mtu == 0) {
3741 link->original_mtu = mtu;
3742 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3743 }
3744
3745 if (link->dhcp_client) {
3746 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3747 link->mtu);
3748 if (r < 0)
3749 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3750 }
3751
3752 if (link->radv) {
3753 r = sd_radv_set_mtu(link->radv, link->mtu);
3754 if (r < 0)
3755 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3756 }
3757 }
3758
3759 /* The kernel may broadcast NEWLINK messages without the MAC address
3760 set, simply ignore them. */
3761 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3762 if (r >= 0) {
3763 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3764 ETH_ALEN)) {
3765
3766 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3767 ETH_ALEN);
3768
3769 log_link_debug(link, "MAC address: "
3770 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3771 mac.ether_addr_octet[0],
3772 mac.ether_addr_octet[1],
3773 mac.ether_addr_octet[2],
3774 mac.ether_addr_octet[3],
3775 mac.ether_addr_octet[4],
3776 mac.ether_addr_octet[5]);
3777
3778 if (link->ipv4ll) {
3779 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3780 if (r < 0)
3781 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3782 }
3783
3784 if (link->dhcp_client) {
3785 r = sd_dhcp_client_set_mac(link->dhcp_client,
3786 (const uint8_t *) &link->mac,
3787 sizeof (link->mac),
3788 ARPHRD_ETHER);
3789 if (r < 0)
3790 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3791
3792 r = dhcp4_set_client_identifier(link);
3793 if (r < 0)
3794 return r;
3795 }
3796
3797 if (link->dhcp6_client) {
3798 const DUID* duid = link_get_duid(link);
3799
3800 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3801 (const uint8_t *) &link->mac,
3802 sizeof (link->mac),
3803 ARPHRD_ETHER);
3804 if (r < 0)
3805 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3806
3807 if (link->network->iaid_set) {
3808 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3809 link->network->iaid);
3810 if (r < 0)
3811 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3812 }
3813
3814 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3815 duid->type,
3816 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3817 duid->raw_data_len);
3818 if (r < 0)
3819 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3820 }
3821
3822 if (link->radv) {
3823 r = sd_radv_set_mac(link->radv, &link->mac);
3824 if (r < 0)
3825 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3826 }
3827
3828 if (link->ndisc) {
3829 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3830 if (r < 0)
3831 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3832 }
3833 }
3834 }
3835
3836 had_carrier = link_has_carrier(link);
3837
3838 r = link_update_flags(link, m);
3839 if (r < 0)
3840 return r;
3841
3842 r = link_update_lldp(link);
3843 if (r < 0)
3844 return r;
3845
3846 carrier_gained = !had_carrier && link_has_carrier(link);
3847 carrier_lost = had_carrier && !link_has_carrier(link);
3848
3849 if (carrier_gained) {
3850 log_link_info(link, "Gained carrier");
3851
3852 r = link_carrier_gained(link);
3853 if (r < 0)
3854 return r;
3855 } else if (carrier_lost) {
3856 log_link_info(link, "Lost carrier");
3857
3858 r = link_carrier_lost(link);
3859 if (r < 0)
3860 return r;
3861 }
3862
3863 return 0;
3864 }
3865
3866 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3867 bool space = false;
3868 Iterator i;
3869 Link *link;
3870
3871 assert(f);
3872 assert(prefix);
3873
3874 if (hashmap_isempty(h))
3875 return;
3876
3877 fputs(prefix, f);
3878 HASHMAP_FOREACH(link, h, i) {
3879 if (space)
3880 fputc(' ', f);
3881
3882 fprintf(f, "%i", link->ifindex);
3883 space = true;
3884 }
3885
3886 fputc('\n', f);
3887 }
3888
3889 int link_save(Link *link) {
3890 _cleanup_free_ char *temp_path = NULL;
3891 _cleanup_fclose_ FILE *f = NULL;
3892 const char *admin_state, *oper_state;
3893 Address *a;
3894 Route *route;
3895 Iterator i;
3896 int r;
3897
3898 assert(link);
3899 assert(link->state_file);
3900 assert(link->lease_file);
3901 assert(link->manager);
3902
3903 if (link->state == LINK_STATE_LINGER) {
3904 (void) unlink(link->state_file);
3905 return 0;
3906 }
3907
3908 link_lldp_save(link);
3909
3910 admin_state = link_state_to_string(link->state);
3911 assert(admin_state);
3912
3913 oper_state = link_operstate_to_string(link->operstate);
3914 assert(oper_state);
3915
3916 r = fopen_temporary(link->state_file, &f, &temp_path);
3917 if (r < 0)
3918 goto fail;
3919
3920 (void) fchmod(fileno(f), 0644);
3921
3922 fprintf(f,
3923 "# This is private data. Do not parse.\n"
3924 "ADMIN_STATE=%s\n"
3925 "OPER_STATE=%s\n",
3926 admin_state, oper_state);
3927
3928 if (link->network) {
3929 bool space;
3930 sd_dhcp6_lease *dhcp6_lease = NULL;
3931 const char *dhcp_domainname = NULL;
3932 char **dhcp6_domains = NULL;
3933 char **dhcp_domains = NULL;
3934 unsigned j;
3935
3936 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3937 yes_no(link->network->required_for_online));
3938
3939 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
3940 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
3941
3942 if (link->dhcp6_client) {
3943 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3944 if (r < 0 && r != -ENOMSG)
3945 log_link_debug(link, "No DHCPv6 lease");
3946 }
3947
3948 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3949
3950 fputs("DNS=", f);
3951 space = false;
3952
3953 for (j = 0; j < link->network->n_dns; j++) {
3954 _cleanup_free_ char *b = NULL;
3955
3956 r = in_addr_to_string(link->network->dns[j].family,
3957 &link->network->dns[j].address, &b);
3958 if (r < 0) {
3959 log_debug_errno(r, "Failed to format address, ignoring: %m");
3960 continue;
3961 }
3962
3963 if (space)
3964 fputc(' ', f);
3965 fputs(b, f);
3966 space = true;
3967 }
3968
3969 if (link->network->dhcp_use_dns &&
3970 link->dhcp_lease) {
3971 const struct in_addr *addresses;
3972
3973 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3974 if (r > 0)
3975 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3976 space = true;
3977 }
3978
3979 if (link->network->dhcp_use_dns && dhcp6_lease) {
3980 struct in6_addr *in6_addrs;
3981
3982 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3983 if (r > 0) {
3984 if (space)
3985 fputc(' ', f);
3986 serialize_in6_addrs(f, in6_addrs, r);
3987 space = true;
3988 }
3989 }
3990
3991 /* Make sure to flush out old entries before we use the NDISC data */
3992 ndisc_vacuum(link);
3993
3994 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3995 NDiscRDNSS *dd;
3996
3997 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3998 if (space)
3999 fputc(' ', f);
4000
4001 serialize_in6_addrs(f, &dd->address, 1);
4002 space = true;
4003 }
4004 }
4005
4006 fputc('\n', f);
4007
4008 fputs("NTP=", f);
4009 space = false;
4010 fputstrv(f, link->network->ntp, NULL, &space);
4011
4012 if (link->network->dhcp_use_ntp &&
4013 link->dhcp_lease) {
4014 const struct in_addr *addresses;
4015
4016 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
4017 if (r > 0)
4018 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4019 space = true;
4020 }
4021
4022 if (link->network->dhcp_use_ntp && dhcp6_lease) {
4023 struct in6_addr *in6_addrs;
4024 char **hosts;
4025
4026 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
4027 &in6_addrs);
4028 if (r > 0) {
4029 if (space)
4030 fputc(' ', f);
4031 serialize_in6_addrs(f, in6_addrs, r);
4032 space = true;
4033 }
4034
4035 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
4036 if (r > 0)
4037 fputstrv(f, hosts, NULL, &space);
4038 }
4039
4040 fputc('\n', f);
4041
4042 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4043 if (link->dhcp_lease) {
4044 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4045 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4046 }
4047 if (dhcp6_lease)
4048 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4049 }
4050
4051 ordered_set_print(f, "DOMAINS=", link->network->search_domains);
4052
4053 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4054 NDiscDNSSL *dd;
4055
4056 if (dhcp_domainname)
4057 fputs_with_space(f, dhcp_domainname, NULL, &space);
4058 if (dhcp_domains)
4059 fputstrv(f, dhcp_domains, NULL, &space);
4060 if (dhcp6_domains)
4061 fputstrv(f, dhcp6_domains, NULL, &space);
4062
4063 SET_FOREACH(dd, link->ndisc_dnssl, i)
4064 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4065 }
4066
4067 fputc('\n', f);
4068
4069 ordered_set_print(f, "ROUTE_DOMAINS=", link->network->route_domains);
4070
4071 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4072 NDiscDNSSL *dd;
4073
4074 if (dhcp_domainname)
4075 fputs_with_space(f, dhcp_domainname, NULL, &space);
4076 if (dhcp_domains)
4077 fputstrv(f, dhcp_domains, NULL, &space);
4078 if (dhcp6_domains)
4079 fputstrv(f, dhcp6_domains, NULL, &space);
4080
4081 SET_FOREACH(dd, link->ndisc_dnssl, i)
4082 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4083 }
4084
4085 fputc('\n', f);
4086
4087 fprintf(f, "LLMNR=%s\n",
4088 resolve_support_to_string(link->network->llmnr));
4089 fprintf(f, "MDNS=%s\n",
4090 resolve_support_to_string(link->network->mdns));
4091 if (link->network->dns_default_route >= 0)
4092 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
4093
4094 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4095 fprintf(f, "DNS_OVER_TLS=%s\n",
4096 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
4097
4098 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
4099 fprintf(f, "DNSSEC=%s\n",
4100 dnssec_mode_to_string(link->network->dnssec_mode));
4101
4102 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
4103 const char *n;
4104
4105 fputs("DNSSEC_NTA=", f);
4106 space = false;
4107 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
4108 fputs_with_space(f, n, NULL, &space);
4109 fputc('\n', f);
4110 }
4111
4112 fputs("ADDRESSES=", f);
4113 space = false;
4114 SET_FOREACH(a, link->addresses, i) {
4115 _cleanup_free_ char *address_str = NULL;
4116
4117 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4118 if (r < 0)
4119 goto fail;
4120
4121 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4122 space = true;
4123 }
4124 fputc('\n', f);
4125
4126 fputs("ROUTES=", f);
4127 space = false;
4128 SET_FOREACH(route, link->routes, i) {
4129 _cleanup_free_ char *route_str = NULL;
4130
4131 r = in_addr_to_string(route->family, &route->dst, &route_str);
4132 if (r < 0)
4133 goto fail;
4134
4135 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4136 space ? " " : "", route_str,
4137 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4138 space = true;
4139 }
4140
4141 fputc('\n', f);
4142 }
4143
4144 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4145 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4146
4147 if (link->dhcp_lease) {
4148 struct in_addr address;
4149 const char *tz = NULL;
4150
4151 assert(link->network);
4152
4153 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
4154 if (r >= 0)
4155 fprintf(f, "TIMEZONE=%s\n", tz);
4156
4157 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
4158 if (r >= 0) {
4159 fputs("DHCP4_ADDRESS=", f);
4160 serialize_in_addrs(f, &address, 1, false, NULL);
4161 fputc('\n', f);
4162 }
4163
4164 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4165 if (r < 0)
4166 goto fail;
4167
4168 fprintf(f,
4169 "DHCP_LEASE=%s\n",
4170 link->lease_file);
4171 } else
4172 (void) unlink(link->lease_file);
4173
4174 if (link->ipv4ll) {
4175 struct in_addr address;
4176
4177 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4178 if (r >= 0) {
4179 fputs("IPV4LL_ADDRESS=", f);
4180 serialize_in_addrs(f, &address, 1, false, NULL);
4181 fputc('\n', f);
4182 }
4183 }
4184
4185 r = fflush_and_check(f);
4186 if (r < 0)
4187 goto fail;
4188
4189 if (rename(temp_path, link->state_file) < 0) {
4190 r = -errno;
4191 goto fail;
4192 }
4193
4194 return 0;
4195
4196 fail:
4197 (void) unlink(link->state_file);
4198 if (temp_path)
4199 (void) unlink(temp_path);
4200
4201 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4202 }
4203
4204 /* The serialized state in /run is no longer up-to-date. */
4205 void link_dirty(Link *link) {
4206 int r;
4207
4208 assert(link);
4209
4210 /* mark manager dirty as link is dirty */
4211 manager_dirty(link->manager);
4212
4213 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
4214 if (r < 0)
4215 /* allocation errors are ignored */
4216 return;
4217
4218 r = set_put(link->manager->dirty_links, link);
4219 if (r <= 0)
4220 /* don't take another ref if the link was already dirty */
4221 return;
4222
4223 link_ref(link);
4224 }
4225
4226 /* The serialized state in /run is up-to-date */
4227 void link_clean(Link *link) {
4228 assert(link);
4229 assert(link->manager);
4230
4231 link_unref(set_remove(link->manager->dirty_links, link));
4232 }
4233
4234 static const char* const link_state_table[_LINK_STATE_MAX] = {
4235 [LINK_STATE_PENDING] = "pending",
4236 [LINK_STATE_INITIALIZED] = "initialized",
4237 [LINK_STATE_CONFIGURING] = "configuring",
4238 [LINK_STATE_CONFIGURED] = "configured",
4239 [LINK_STATE_UNMANAGED] = "unmanaged",
4240 [LINK_STATE_FAILED] = "failed",
4241 [LINK_STATE_LINGER] = "linger",
4242 };
4243
4244 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
Unnamed repository; edit this file 'description' to name the repository.