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network: move sd_lldp related functions to networkd-lldp-rx.c
[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 if (streq_ptr(link->kind, "can"))
2126 link_set_can(link);
2127
2128 return 1;
2129 }
2130
2131 int link_down(Link *link) {
2132 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2133 int r;
2134
2135 assert(link);
2136 assert(link->manager);
2137 assert(link->manager->rtnl);
2138
2139 log_link_debug(link, "Bringing link down");
2140
2141 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
2142 RTM_SETLINK, link->ifindex);
2143 if (r < 0)
2144 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2145
2146 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
2147 if (r < 0)
2148 return log_link_error_errno(link, r, "Could not set link flags: %m");
2149
2150 r = netlink_call_async(link->manager->rtnl, NULL, req, link_down_handler,
2151 link_netlink_destroy_callback, link);
2152 if (r < 0)
2153 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2154
2155 link_ref(link);
2156
2157 return 0;
2158 }
2159
2160 static int link_handle_bound_to_list(Link *link) {
2161 Link *l;
2162 Iterator i;
2163 int r;
2164 bool required_up = false;
2165 bool link_is_up = false;
2166
2167 assert(link);
2168
2169 if (hashmap_isempty(link->bound_to_links))
2170 return 0;
2171
2172 if (link->flags & IFF_UP)
2173 link_is_up = true;
2174
2175 HASHMAP_FOREACH (l, link->bound_to_links, i)
2176 if (link_has_carrier(l)) {
2177 required_up = true;
2178 break;
2179 }
2180
2181 if (!required_up && link_is_up) {
2182 r = link_down(link);
2183 if (r < 0)
2184 return r;
2185 } else if (required_up && !link_is_up) {
2186 r = link_up(link);
2187 if (r < 0)
2188 return r;
2189 }
2190
2191 return 0;
2192 }
2193
2194 static int link_handle_bound_by_list(Link *link) {
2195 Iterator i;
2196 Link *l;
2197 int r;
2198
2199 assert(link);
2200
2201 if (hashmap_isempty(link->bound_by_links))
2202 return 0;
2203
2204 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2205 r = link_handle_bound_to_list(l);
2206 if (r < 0)
2207 return r;
2208 }
2209
2210 return 0;
2211 }
2212
2213 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2214 int r;
2215
2216 assert(link);
2217 assert(carrier);
2218
2219 if (link == carrier)
2220 return 0;
2221
2222 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2223 return 0;
2224
2225 r = hashmap_ensure_allocated(h, NULL);
2226 if (r < 0)
2227 return r;
2228
2229 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2230 if (r < 0)
2231 return r;
2232
2233 return 0;
2234 }
2235
2236 static int link_new_bound_by_list(Link *link) {
2237 Manager *m;
2238 Link *carrier;
2239 Iterator i;
2240 int r;
2241 bool list_updated = false;
2242
2243 assert(link);
2244 assert(link->manager);
2245
2246 m = link->manager;
2247
2248 HASHMAP_FOREACH(carrier, m->links, i) {
2249 if (!carrier->network)
2250 continue;
2251
2252 if (strv_isempty(carrier->network->bind_carrier))
2253 continue;
2254
2255 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2256 r = link_put_carrier(link, carrier, &link->bound_by_links);
2257 if (r < 0)
2258 return r;
2259
2260 list_updated = true;
2261 }
2262 }
2263
2264 if (list_updated)
2265 link_dirty(link);
2266
2267 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2268 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2269 if (r < 0)
2270 return r;
2271
2272 link_dirty(carrier);
2273 }
2274
2275 return 0;
2276 }
2277
2278 static int link_new_bound_to_list(Link *link) {
2279 Manager *m;
2280 Link *carrier;
2281 Iterator i;
2282 int r;
2283 bool list_updated = false;
2284
2285 assert(link);
2286 assert(link->manager);
2287
2288 if (!link->network)
2289 return 0;
2290
2291 if (strv_isempty(link->network->bind_carrier))
2292 return 0;
2293
2294 m = link->manager;
2295
2296 HASHMAP_FOREACH (carrier, m->links, i) {
2297 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2298 r = link_put_carrier(link, carrier, &link->bound_to_links);
2299 if (r < 0)
2300 return r;
2301
2302 list_updated = true;
2303 }
2304 }
2305
2306 if (list_updated)
2307 link_dirty(link);
2308
2309 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2310 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2311 if (r < 0)
2312 return r;
2313
2314 link_dirty(carrier);
2315 }
2316
2317 return 0;
2318 }
2319
2320 static int link_new_carrier_maps(Link *link) {
2321 int r;
2322
2323 r = link_new_bound_by_list(link);
2324 if (r < 0)
2325 return r;
2326
2327 r = link_handle_bound_by_list(link);
2328 if (r < 0)
2329 return r;
2330
2331 r = link_new_bound_to_list(link);
2332 if (r < 0)
2333 return r;
2334
2335 r = link_handle_bound_to_list(link);
2336 if (r < 0)
2337 return r;
2338
2339 return 0;
2340 }
2341
2342 static void link_free_bound_to_list(Link *link) {
2343 Link *bound_to;
2344 Iterator i;
2345
2346 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2347 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2348
2349 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2350 link_dirty(bound_to);
2351 }
2352
2353 return;
2354 }
2355
2356 static void link_free_bound_by_list(Link *link) {
2357 Link *bound_by;
2358 Iterator i;
2359
2360 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2361 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2362
2363 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2364 link_dirty(bound_by);
2365 link_handle_bound_to_list(bound_by);
2366 }
2367 }
2368
2369 return;
2370 }
2371
2372 static void link_free_carrier_maps(Link *link) {
2373 bool list_updated = false;
2374
2375 assert(link);
2376
2377 if (!hashmap_isempty(link->bound_to_links)) {
2378 link_free_bound_to_list(link);
2379 list_updated = true;
2380 }
2381
2382 if (!hashmap_isempty(link->bound_by_links)) {
2383 link_free_bound_by_list(link);
2384 list_updated = true;
2385 }
2386
2387 if (list_updated)
2388 link_dirty(link);
2389
2390 return;
2391 }
2392
2393 static int link_append_to_master(Link *link, NetDev *netdev) {
2394 Link *master;
2395 int r;
2396
2397 assert(link);
2398 assert(netdev);
2399
2400 r = link_get(link->manager, netdev->ifindex, &master);
2401 if (r < 0)
2402 return r;
2403
2404 r = set_ensure_allocated(&master->slaves, NULL);
2405 if (r < 0)
2406 return r;
2407
2408 r = set_put(master->slaves, link);
2409 if (r < 0)
2410 return r;
2411
2412 link_ref(link);
2413 return 0;
2414 }
2415
2416 static void link_drop_from_master(Link *link, NetDev *netdev) {
2417 Link *master;
2418
2419 assert(link);
2420
2421 if (!link->manager || !netdev)
2422 return;
2423
2424 if (link_get(link->manager, netdev->ifindex, &master) < 0)
2425 return;
2426
2427 link_unref(set_remove(master->slaves, link));
2428 }
2429
2430 static void link_detach_from_manager(Link *link) {
2431 if (!link || !link->manager)
2432 return;
2433
2434 link_unref(set_remove(link->manager->links_requesting_uuid, link));
2435 link_clean(link);
2436
2437 /* The following must be called at last. */
2438 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2439 link_unref(link);
2440 }
2441
2442 void link_drop(Link *link) {
2443 if (!link || link->state == LINK_STATE_LINGER)
2444 return;
2445
2446 link_set_state(link, LINK_STATE_LINGER);
2447
2448 link_free_carrier_maps(link);
2449
2450 if (link->network) {
2451 link_drop_from_master(link, link->network->bridge);
2452 link_drop_from_master(link, link->network->bond);
2453 }
2454
2455 log_link_debug(link, "Link removed");
2456
2457 (void) unlink(link->state_file);
2458 link_detach_from_manager(link);
2459 }
2460
2461 static int link_joined(Link *link) {
2462 int r;
2463
2464 assert(link);
2465 assert(link->network);
2466
2467 if (!hashmap_isempty(link->bound_to_links)) {
2468 r = link_handle_bound_to_list(link);
2469 if (r < 0)
2470 return r;
2471 } else if (!(link->flags & IFF_UP)) {
2472 r = link_up(link);
2473 if (r < 0) {
2474 link_enter_failed(link);
2475 return r;
2476 }
2477 }
2478
2479 if (link->network->bridge) {
2480 r = link_set_bridge(link);
2481 if (r < 0)
2482 log_link_error_errno(link, r, "Could not set bridge message: %m");
2483
2484 r = link_append_to_master(link, link->network->bridge);
2485 if (r < 0)
2486 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2487 }
2488
2489 if (link->network->bond) {
2490 r = link_set_bond(link);
2491 if (r < 0)
2492 log_link_error_errno(link, r, "Could not set bond message: %m");
2493
2494 r = link_append_to_master(link, link->network->bond);
2495 if (r < 0)
2496 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2497 }
2498
2499 if (link->network->use_br_vlan &&
2500 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2501 r = link_set_bridge_vlan(link);
2502 if (r < 0)
2503 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2504 }
2505
2506 /* Skip setting up addresses until it gets carrier,
2507 or it would try to set addresses twice,
2508 which is bad for non-idempotent steps. */
2509 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2510 return 0;
2511
2512 return link_request_set_addresses(link);
2513 }
2514
2515 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2516 int r;
2517
2518 assert(link);
2519 assert(link->network);
2520 assert(link->enslaving > 0);
2521 assert(!link->enslaved_raw);
2522
2523 link->enslaving--;
2524
2525 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2526 return 1;
2527
2528 r = sd_netlink_message_get_errno(m);
2529 if (r < 0 && r != -EEXIST) {
2530 log_link_error_errno(link, r, "Could not join netdev: %m");
2531 link_enter_failed(link);
2532 return 1;
2533 } else
2534 log_link_debug(link, "Joined netdev");
2535
2536 if (link->enslaving == 0) {
2537 link->enslaved_raw = true;
2538 link_joined(link);
2539 }
2540
2541 return 1;
2542 }
2543
2544 static int link_enter_join_netdev(Link *link) {
2545 NetDev *netdev;
2546 Iterator i;
2547 int r;
2548
2549 assert(link);
2550 assert(link->network);
2551 assert(link->state == LINK_STATE_INITIALIZED);
2552
2553 link_set_state(link, LINK_STATE_CONFIGURING);
2554
2555 link_dirty(link);
2556 link->enslaving = 0;
2557 link->enslaved_raw = false;
2558
2559 if (link->network->bond) {
2560 if (link->network->bond->state == NETDEV_STATE_READY &&
2561 link->network->bond->ifindex == link->master_ifindex)
2562 return link_joined(link);
2563
2564 log_struct(LOG_DEBUG,
2565 LOG_LINK_INTERFACE(link),
2566 LOG_NETDEV_INTERFACE(link->network->bond),
2567 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2568
2569 link->enslaving++;
2570
2571 r = netdev_join(link->network->bond, link, netdev_join_handler);
2572 if (r < 0) {
2573 log_struct_errno(LOG_WARNING, r,
2574 LOG_LINK_INTERFACE(link),
2575 LOG_NETDEV_INTERFACE(link->network->bond),
2576 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2577 link_enter_failed(link);
2578 return r;
2579 }
2580 }
2581
2582 if (link->network->bridge) {
2583 log_struct(LOG_DEBUG,
2584 LOG_LINK_INTERFACE(link),
2585 LOG_NETDEV_INTERFACE(link->network->bridge),
2586 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2587
2588 link->enslaving++;
2589
2590 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2591 if (r < 0) {
2592 log_struct_errno(LOG_WARNING, r,
2593 LOG_LINK_INTERFACE(link),
2594 LOG_NETDEV_INTERFACE(link->network->bridge),
2595 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2596 link_enter_failed(link);
2597 return r;
2598 }
2599 }
2600
2601 if (link->network->vrf) {
2602 log_struct(LOG_DEBUG,
2603 LOG_LINK_INTERFACE(link),
2604 LOG_NETDEV_INTERFACE(link->network->vrf),
2605 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2606
2607 link->enslaving++;
2608
2609 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2610 if (r < 0) {
2611 log_struct_errno(LOG_WARNING, r,
2612 LOG_LINK_INTERFACE(link),
2613 LOG_NETDEV_INTERFACE(link->network->vrf),
2614 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2615 link_enter_failed(link);
2616 return r;
2617 }
2618 }
2619
2620 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2621
2622 if (netdev->ifindex > 0)
2623 /* Assume already enslaved. */
2624 continue;
2625
2626 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2627 continue;
2628
2629 log_struct(LOG_DEBUG,
2630 LOG_LINK_INTERFACE(link),
2631 LOG_NETDEV_INTERFACE(netdev),
2632 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2633
2634 link->enslaving++;
2635
2636 r = netdev_join(netdev, link, netdev_join_handler);
2637 if (r < 0) {
2638 log_struct_errno(LOG_WARNING, r,
2639 LOG_LINK_INTERFACE(link),
2640 LOG_NETDEV_INTERFACE(netdev),
2641 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2642 link_enter_failed(link);
2643 return r;
2644 }
2645 }
2646
2647 if (link->enslaving == 0)
2648 return link_joined(link);
2649
2650 return 0;
2651 }
2652
2653 static int link_set_ipv4_forward(Link *link) {
2654 int r;
2655
2656 if (!link_ipv4_forward_enabled(link))
2657 return 0;
2658
2659 /* We propagate the forwarding flag from one interface to the
2660 * global setting one way. This means: as long as at least one
2661 * interface was configured at any time that had IP forwarding
2662 * enabled the setting will stay on for good. We do this
2663 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2664 * somewhat in sync (see below). */
2665
2666 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2667 if (r < 0)
2668 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2669
2670 return 0;
2671 }
2672
2673 static int link_set_ipv6_forward(Link *link) {
2674 int r;
2675
2676 if (!link_ipv6_forward_enabled(link))
2677 return 0;
2678
2679 /* On Linux, the IPv6 stack does not know a per-interface
2680 * packet forwarding setting: either packet forwarding is on
2681 * for all, or off for all. We hence don't bother with a
2682 * per-interface setting, but simply propagate the interface
2683 * flag, if it is set, to the global flag, one-way. Note that
2684 * while IPv4 would allow a per-interface flag, we expose the
2685 * same behaviour there and also propagate the setting from
2686 * one to all, to keep things simple (see above). */
2687
2688 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2689 if (r < 0)
2690 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2691
2692 return 0;
2693 }
2694
2695 static int link_set_ipv6_privacy_extensions(Link *link) {
2696 IPv6PrivacyExtensions s;
2697 int r;
2698
2699 s = link_ipv6_privacy_extensions(link);
2700 if (s < 0)
2701 return 0;
2702
2703 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2704 if (r < 0)
2705 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2706
2707 return 0;
2708 }
2709
2710 static int link_set_ipv6_accept_ra(Link *link) {
2711 int r;
2712
2713 /* Make this a NOP if IPv6 is not available */
2714 if (!socket_ipv6_is_supported())
2715 return 0;
2716
2717 if (link->flags & IFF_LOOPBACK)
2718 return 0;
2719
2720 if (!link->network)
2721 return 0;
2722
2723 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2724 if (r < 0)
2725 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2726
2727 return 0;
2728 }
2729
2730 static int link_set_ipv6_dad_transmits(Link *link) {
2731 int r;
2732
2733 /* Make this a NOP if IPv6 is not available */
2734 if (!socket_ipv6_is_supported())
2735 return 0;
2736
2737 if (link->flags & IFF_LOOPBACK)
2738 return 0;
2739
2740 if (!link->network)
2741 return 0;
2742
2743 if (link->network->ipv6_dad_transmits < 0)
2744 return 0;
2745
2746 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2747 if (r < 0)
2748 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2749
2750 return 0;
2751 }
2752
2753 static int link_set_ipv6_hop_limit(Link *link) {
2754 int r;
2755
2756 /* Make this a NOP if IPv6 is not available */
2757 if (!socket_ipv6_is_supported())
2758 return 0;
2759
2760 if (link->flags & IFF_LOOPBACK)
2761 return 0;
2762
2763 if (!link->network)
2764 return 0;
2765
2766 if (link->network->ipv6_hop_limit < 0)
2767 return 0;
2768
2769 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2770 if (r < 0)
2771 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2772
2773 return 0;
2774 }
2775
2776 static int link_set_ipv6_mtu(Link *link) {
2777 int r;
2778
2779 /* Make this a NOP if IPv6 is not available */
2780 if (!socket_ipv6_is_supported())
2781 return 0;
2782
2783 if (link->flags & IFF_LOOPBACK)
2784 return 0;
2785
2786 if (link->network->ipv6_mtu == 0)
2787 return 0;
2788
2789 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2790 if (r < 0)
2791 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2792
2793 return 0;
2794 }
2795
2796 static bool link_is_static_address_configured(Link *link, Address *address) {
2797 Address *net_address;
2798
2799 assert(link);
2800 assert(address);
2801
2802 if (!link->network)
2803 return false;
2804
2805 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2806 if (address_equal(net_address, address))
2807 return true;
2808
2809 return false;
2810 }
2811
2812 static bool link_is_static_route_configured(Link *link, Route *route) {
2813 Route *net_route;
2814
2815 assert(link);
2816 assert(route);
2817
2818 if (!link->network)
2819 return false;
2820
2821 LIST_FOREACH(routes, net_route, link->network->static_routes)
2822 if (route_equal(net_route, route))
2823 return true;
2824
2825 return false;
2826 }
2827
2828 static int link_drop_foreign_config(Link *link) {
2829 Address *address;
2830 Route *route;
2831 Iterator i;
2832 int r;
2833
2834 SET_FOREACH(address, link->addresses_foreign, i) {
2835 /* we consider IPv6LL addresses to be managed by the kernel */
2836 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2837 continue;
2838
2839 if (link_is_static_address_configured(link, address)) {
2840 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2841 if (r < 0)
2842 return log_link_error_errno(link, r, "Failed to add address: %m");
2843 } else {
2844 r = address_remove(address, link, NULL);
2845 if (r < 0)
2846 return r;
2847 }
2848 }
2849
2850 SET_FOREACH(route, link->routes_foreign, i) {
2851 /* do not touch routes managed by the kernel */
2852 if (route->protocol == RTPROT_KERNEL)
2853 continue;
2854
2855 if (link_is_static_route_configured(link, route)) {
2856 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2857 if (r < 0)
2858 return r;
2859 } else {
2860 r = route_remove(route, link, NULL);
2861 if (r < 0)
2862 return r;
2863 }
2864 }
2865
2866 return 0;
2867 }
2868
2869 static int link_drop_config(Link *link) {
2870 Address *address, *pool_address;
2871 Route *route;
2872 Iterator i;
2873 int r;
2874
2875 SET_FOREACH(address, link->addresses, i) {
2876 /* we consider IPv6LL addresses to be managed by the kernel */
2877 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2878 continue;
2879
2880 r = address_remove(address, link, NULL);
2881 if (r < 0)
2882 return r;
2883
2884 /* If this address came from an address pool, clean up the pool */
2885 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2886 if (address_equal(address, pool_address)) {
2887 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2888 address_free(pool_address);
2889 break;
2890 }
2891 }
2892 }
2893
2894 SET_FOREACH(route, link->routes, i) {
2895 /* do not touch routes managed by the kernel */
2896 if (route->protocol == RTPROT_KERNEL)
2897 continue;
2898
2899 r = route_remove(route, link, NULL);
2900 if (r < 0)
2901 return r;
2902 }
2903
2904 ndisc_flush(link);
2905
2906 return 0;
2907 }
2908
2909 static int link_configure_can(Link *link) {
2910 int r;
2911
2912 if (streq_ptr(link->kind, "can")) {
2913 /* The CAN interface must be down to configure bitrate, etc... */
2914 if ((link->flags & IFF_UP)) {
2915 r = link_down(link);
2916 if (r < 0) {
2917 link_enter_failed(link);
2918 return r;
2919 }
2920
2921 return 0;
2922 }
2923
2924 return link_set_can(link);
2925 }
2926
2927 if (!(link->flags & IFF_UP)) {
2928 r = link_up_can(link);
2929 if (r < 0) {
2930 link_enter_failed(link);
2931 return r;
2932 }
2933 }
2934
2935 return 0;
2936 }
2937
2938 static int link_configure(Link *link) {
2939 int r;
2940
2941 assert(link);
2942 assert(link->network);
2943 assert(link->state == LINK_STATE_INITIALIZED);
2944
2945 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
2946 return link_configure_can(link);
2947
2948 /* Drop foreign config, but ignore loopback or critical devices.
2949 * We do not want to remove loopback address or addresses used for root NFS. */
2950 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2951 r = link_drop_foreign_config(link);
2952 if (r < 0)
2953 return r;
2954 }
2955
2956 r = link_set_proxy_arp(link);
2957 if (r < 0)
2958 return r;
2959
2960 r = ipv6_proxy_ndp_addresses_configure(link);
2961 if (r < 0)
2962 return r;
2963
2964 r = link_set_ipv4_forward(link);
2965 if (r < 0)
2966 return r;
2967
2968 r = link_set_ipv6_forward(link);
2969 if (r < 0)
2970 return r;
2971
2972 r = link_set_ipv6_privacy_extensions(link);
2973 if (r < 0)
2974 return r;
2975
2976 r = link_set_ipv6_accept_ra(link);
2977 if (r < 0)
2978 return r;
2979
2980 r = link_set_ipv6_dad_transmits(link);
2981 if (r < 0)
2982 return r;
2983
2984 r = link_set_ipv6_hop_limit(link);
2985 if (r < 0)
2986 return r;
2987
2988 r = link_set_flags(link);
2989 if (r < 0)
2990 return r;
2991
2992 r = link_set_ipv6_mtu(link);
2993 if (r < 0)
2994 return r;
2995
2996 if (link_ipv4ll_enabled(link) || link_ipv4ll_fallback_enabled(link)) {
2997 r = ipv4ll_configure(link);
2998 if (r < 0)
2999 return r;
3000 }
3001
3002 if (link_dhcp4_enabled(link)) {
3003 r = dhcp4_set_promote_secondaries(link);
3004 if (r < 0)
3005 return r;
3006
3007 r = dhcp4_configure(link);
3008 if (r < 0)
3009 return r;
3010 }
3011
3012 if (link_dhcp4_server_enabled(link)) {
3013 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
3014 if (r < 0)
3015 return r;
3016
3017 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
3018 if (r < 0)
3019 return r;
3020 }
3021
3022 if (link_dhcp6_enabled(link) ||
3023 link_ipv6_accept_ra_enabled(link)) {
3024 r = dhcp6_configure(link);
3025 if (r < 0)
3026 return r;
3027 }
3028
3029 if (link_ipv6_accept_ra_enabled(link)) {
3030 r = ndisc_configure(link);
3031 if (r < 0)
3032 return r;
3033 }
3034
3035 if (link_radv_enabled(link)) {
3036 r = radv_configure(link);
3037 if (r < 0)
3038 return r;
3039 }
3040
3041 if (link_lldp_rx_enabled(link)) {
3042 r = link_lldp_rx_configure(link);
3043 if (r < 0)
3044 return r;
3045 }
3046
3047 r = link_set_mtu(link, link->network->mtu, link->network->mtu_is_set);
3048 if (r < 0)
3049 return r;
3050
3051 if (socket_ipv6_is_supported()) {
3052 r = link_configure_addrgen_mode(link);
3053 if (r < 0)
3054 return r;
3055 }
3056
3057 return link_configure_after_setting_mtu(link);
3058 }
3059
3060 static int link_configure_after_setting_mtu(Link *link) {
3061 int r;
3062
3063 assert(link);
3064 assert(link->network);
3065 assert(link->state == LINK_STATE_INITIALIZED);
3066
3067 if (link->setting_mtu)
3068 return 0;
3069
3070 if (link_has_carrier(link) || link->network->configure_without_carrier) {
3071 r = link_acquire_conf(link);
3072 if (r < 0)
3073 return r;
3074 }
3075
3076 return link_enter_join_netdev(link);
3077 }
3078
3079 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3080 assert(duid);
3081
3082 if (duid->raw_data_len > 0)
3083 return 0;
3084
3085 if (duid->type != DUID_TYPE_UUID)
3086 return -EINVAL;
3087
3088 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3089 duid->raw_data_len = sizeof(sd_id128_t);
3090
3091 return 1;
3092 }
3093
3094 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3095 Manager *manager = userdata;
3096 const sd_bus_error *e;
3097 const void *a;
3098 size_t sz;
3099 DUID *duid;
3100 Link *link;
3101 int r;
3102
3103 assert(m);
3104 assert(manager);
3105
3106 e = sd_bus_message_get_error(m);
3107 if (e) {
3108 log_error_errno(sd_bus_error_get_errno(e),
3109 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3110 e->message);
3111 goto configure;
3112 }
3113
3114 r = sd_bus_message_read_array(m, 'y', &a, &sz);
3115 if (r < 0)
3116 goto configure;
3117
3118 if (sz != sizeof(sd_id128_t)) {
3119 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3120 goto configure;
3121 }
3122
3123 memcpy(&manager->product_uuid, a, sz);
3124 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3125 (void) duid_set_uuid(duid, manager->product_uuid);
3126
3127 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3128
3129 configure:
3130 while ((link = set_steal_first(manager->links_requesting_uuid))) {
3131 r = link_configure(link);
3132 if (r < 0)
3133 log_link_error_errno(link, r, "Failed to configure link: %m");
3134 }
3135
3136 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3137
3138 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3139 * even if the method fails. */
3140 manager->has_product_uuid = true;
3141
3142 return 1;
3143 }
3144
3145 static bool link_requires_uuid(Link *link) {
3146 const DUID *duid;
3147
3148 assert(link);
3149 assert(link->manager);
3150 assert(link->network);
3151
3152 duid = link_get_duid(link);
3153 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3154 return false;
3155
3156 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3157 return true;
3158
3159 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3160 return true;
3161
3162 return false;
3163 }
3164
3165 static int link_configure_duid(Link *link) {
3166 Manager *m;
3167 DUID *duid;
3168 int r;
3169
3170 assert(link);
3171 assert(link->manager);
3172 assert(link->network);
3173
3174 m = link->manager;
3175 duid = link_get_duid(link);
3176
3177 if (!link_requires_uuid(link))
3178 return 1;
3179
3180 if (m->has_product_uuid) {
3181 (void) duid_set_uuid(duid, m->product_uuid);
3182 return 1;
3183 }
3184
3185 if (!m->links_requesting_uuid) {
3186 r = manager_request_product_uuid(m, link);
3187 if (r < 0) {
3188 if (r == -ENOMEM)
3189 return r;
3190
3191 log_link_warning_errno(link, r,
3192 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3193 return 1;
3194 }
3195 } else {
3196 r = set_put(m->links_requesting_uuid, link);
3197 if (r < 0)
3198 return log_oom();
3199
3200 r = set_put(m->duids_requesting_uuid, duid);
3201 if (r < 0)
3202 return log_oom();
3203 }
3204
3205 return 0;
3206 }
3207
3208 static int link_initialized_and_synced(Link *link) {
3209 Network *network;
3210 int r;
3211
3212 assert(link);
3213 assert(link->ifname);
3214 assert(link->manager);
3215
3216 /* We may get called either from the asynchronous netlink callback,
3217 * or directly for link_add() if running in a container. See link_add(). */
3218 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3219 return 0;
3220
3221 log_link_debug(link, "Link state is up-to-date");
3222 link_set_state(link, LINK_STATE_INITIALIZED);
3223
3224 r = link_new_bound_by_list(link);
3225 if (r < 0)
3226 return r;
3227
3228 r = link_handle_bound_by_list(link);
3229 if (r < 0)
3230 return r;
3231
3232 if (!link->network) {
3233 r = network_get(link->manager, link->sd_device, link->ifname,
3234 &link->mac, &network);
3235 if (r == -ENOENT) {
3236 link_enter_unmanaged(link);
3237 return 0;
3238 } else if (r == 0 && network->unmanaged) {
3239 link_enter_unmanaged(link);
3240 return 0;
3241 } else if (r < 0)
3242 return r;
3243
3244 if (link->flags & IFF_LOOPBACK) {
3245 if (network->link_local != ADDRESS_FAMILY_NO)
3246 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3247
3248 if (network->dhcp != ADDRESS_FAMILY_NO)
3249 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3250
3251 if (network->dhcp_server)
3252 log_link_debug(link, "Ignoring DHCP server for loopback link");
3253 }
3254
3255 r = network_apply(network, link);
3256 if (r < 0)
3257 return r;
3258 }
3259
3260 r = link_new_bound_to_list(link);
3261 if (r < 0)
3262 return r;
3263
3264 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3265 * link_configure() is called later asynchronously. */
3266 r = link_configure_duid(link);
3267 if (r <= 0)
3268 return r;
3269
3270 r = link_configure(link);
3271 if (r < 0)
3272 return r;
3273
3274 return 0;
3275 }
3276
3277 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3278 (void) link_initialized_and_synced(link);
3279 return 1;
3280 }
3281
3282 int link_initialized(Link *link, sd_device *device) {
3283 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3284 int r;
3285
3286 assert(link);
3287 assert(link->manager);
3288 assert(link->manager->rtnl);
3289 assert(device);
3290
3291 if (link->state != LINK_STATE_PENDING)
3292 return 0;
3293
3294 if (link->sd_device)
3295 return 0;
3296
3297 log_link_debug(link, "udev initialized link");
3298 link_set_state(link, LINK_STATE_INITIALIZED);
3299
3300 link->sd_device = sd_device_ref(device);
3301
3302 /* udev has initialized the link, but we don't know if we have yet
3303 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3304 * when it returns we know that the pending NEWLINKs have already been
3305 * processed and that we are up-to-date */
3306
3307 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3308 link->ifindex);
3309 if (r < 0)
3310 return r;
3311
3312 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3313 link_netlink_destroy_callback, link);
3314 if (r < 0)
3315 return r;
3316
3317 link_ref(link);
3318
3319 return 0;
3320 }
3321
3322 static int link_load(Link *link) {
3323 _cleanup_free_ char *network_file = NULL,
3324 *addresses = NULL,
3325 *routes = NULL,
3326 *dhcp4_address = NULL,
3327 *ipv4ll_address = NULL;
3328 union in_addr_union address;
3329 union in_addr_union route_dst;
3330 const char *p;
3331 int r;
3332
3333 assert(link);
3334
3335 r = parse_env_file(NULL, link->state_file,
3336 "NETWORK_FILE", &network_file,
3337 "ADDRESSES", &addresses,
3338 "ROUTES", &routes,
3339 "DHCP4_ADDRESS", &dhcp4_address,
3340 "IPV4LL_ADDRESS", &ipv4ll_address);
3341 if (r < 0 && r != -ENOENT)
3342 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3343
3344 if (network_file) {
3345 Network *network;
3346 char *suffix;
3347
3348 /* drop suffix */
3349 suffix = strrchr(network_file, '.');
3350 if (!suffix) {
3351 log_link_debug(link, "Failed to get network name from %s", network_file);
3352 goto network_file_fail;
3353 }
3354 *suffix = '\0';
3355
3356 r = network_get_by_name(link->manager, basename(network_file), &network);
3357 if (r < 0) {
3358 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3359 goto network_file_fail;
3360 }
3361
3362 r = network_apply(network, link);
3363 if (r < 0)
3364 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3365 }
3366
3367 network_file_fail:
3368
3369 if (addresses) {
3370 p = addresses;
3371
3372 for (;;) {
3373 _cleanup_free_ char *address_str = NULL;
3374 char *prefixlen_str;
3375 int family;
3376 unsigned char prefixlen;
3377
3378 r = extract_first_word(&p, &address_str, NULL, 0);
3379 if (r < 0) {
3380 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3381 continue;
3382 }
3383 if (r == 0)
3384 break;
3385
3386 prefixlen_str = strchr(address_str, '/');
3387 if (!prefixlen_str) {
3388 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3389 continue;
3390 }
3391
3392 *prefixlen_str++ = '\0';
3393
3394 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3395 if (r != 1) {
3396 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3397 continue;
3398 }
3399
3400 r = in_addr_from_string_auto(address_str, &family, &address);
3401 if (r < 0) {
3402 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3403 continue;
3404 }
3405
3406 r = address_add(link, family, &address, prefixlen, NULL);
3407 if (r < 0)
3408 return log_link_error_errno(link, r, "Failed to add address: %m");
3409 }
3410 }
3411
3412 if (routes) {
3413 p = routes;
3414
3415 for (;;) {
3416 Route *route;
3417 _cleanup_free_ char *route_str = NULL;
3418 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3419 usec_t lifetime;
3420 char *prefixlen_str;
3421 int family;
3422 unsigned char prefixlen, tos, table;
3423 uint32_t priority;
3424
3425 r = extract_first_word(&p, &route_str, NULL, 0);
3426 if (r < 0) {
3427 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3428 continue;
3429 }
3430 if (r == 0)
3431 break;
3432
3433 prefixlen_str = strchr(route_str, '/');
3434 if (!prefixlen_str) {
3435 log_link_debug(link, "Failed to parse route %s", route_str);
3436 continue;
3437 }
3438
3439 *prefixlen_str++ = '\0';
3440
3441 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3442 if (r != 5) {
3443 log_link_debug(link,
3444 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3445 prefixlen_str);
3446 continue;
3447 }
3448
3449 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3450 if (r < 0) {
3451 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3452 continue;
3453 }
3454
3455 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3456 if (r < 0)
3457 return log_link_error_errno(link, r, "Failed to add route: %m");
3458
3459 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3460 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3461 0, route_expire_handler, route);
3462 if (r < 0)
3463 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3464 }
3465
3466 route->lifetime = lifetime;
3467 sd_event_source_unref(route->expire);
3468 route->expire = TAKE_PTR(expire);
3469 }
3470 }
3471
3472 if (dhcp4_address) {
3473 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3474 if (r < 0) {
3475 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3476 goto dhcp4_address_fail;
3477 }
3478
3479 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3480 if (r < 0)
3481 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3482
3483 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3484 if (r < 0)
3485 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3486 }
3487
3488 dhcp4_address_fail:
3489
3490 if (ipv4ll_address) {
3491 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3492 if (r < 0) {
3493 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3494 goto ipv4ll_address_fail;
3495 }
3496
3497 r = sd_ipv4ll_new(&link->ipv4ll);
3498 if (r < 0)
3499 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3500
3501 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3502 if (r < 0)
3503 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3504 }
3505
3506 ipv4ll_address_fail:
3507
3508 return 0;
3509 }
3510
3511 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3512 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3513 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3514 Link *link;
3515 int r;
3516
3517 assert(m);
3518 assert(m->rtnl);
3519 assert(message);
3520 assert(ret);
3521
3522 r = link_new(m, message, ret);
3523 if (r < 0)
3524 return r;
3525
3526 link = *ret;
3527
3528 log_link_debug(link, "Link %d added", link->ifindex);
3529
3530 r = link_load(link);
3531 if (r < 0)
3532 return r;
3533
3534 if (detect_container() <= 0) {
3535 /* not in a container, udev will be around */
3536 sprintf(ifindex_str, "n%d", link->ifindex);
3537 r = sd_device_new_from_device_id(&device, ifindex_str);
3538 if (r < 0) {
3539 log_link_warning_errno(link, r, "Could not find device: %m");
3540 goto failed;
3541 }
3542
3543 r = sd_device_get_is_initialized(device);
3544 if (r < 0) {
3545 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3546 goto failed;
3547 }
3548 if (r == 0) {
3549 /* not yet ready */
3550 log_link_debug(link, "link pending udev initialization...");
3551 return 0;
3552 }
3553
3554 r = device_is_renaming(device);
3555 if (r < 0) {
3556 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3557 goto failed;
3558 }
3559 if (r > 0) {
3560 log_link_debug(link, "Interface is under renaming, pending initialization.");
3561 return 0;
3562 }
3563
3564 r = link_initialized(link, device);
3565 if (r < 0)
3566 goto failed;
3567 } else {
3568 r = link_initialized_and_synced(link);
3569 if (r < 0)
3570 goto failed;
3571 }
3572
3573 return 0;
3574 failed:
3575 link_enter_failed(link);
3576 return r;
3577 }
3578
3579 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3580 int r;
3581
3582 assert(link);
3583
3584 log_link_info(link, "Gained IPv6LL");
3585
3586 link->ipv6ll_address = *address;
3587 link_check_ready(link);
3588
3589 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3590 r = link_acquire_ipv6_conf(link);
3591 if (r < 0) {
3592 link_enter_failed(link);
3593 return r;
3594 }
3595 }
3596
3597 return 0;
3598 }
3599
3600 static int link_carrier_gained(Link *link) {
3601 int r;
3602
3603 assert(link);
3604
3605 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3606 r = link_acquire_conf(link);
3607 if (r < 0) {
3608 link_enter_failed(link);
3609 return r;
3610 }
3611
3612 r = link_request_set_addresses(link);
3613 if (r < 0)
3614 return r;
3615 }
3616
3617 r = link_handle_bound_by_list(link);
3618 if (r < 0)
3619 return r;
3620
3621 return 0;
3622 }
3623
3624 static int link_carrier_lost(Link *link) {
3625 int r;
3626
3627 assert(link);
3628
3629 if (link->network && link->network->ignore_carrier_loss)
3630 return 0;
3631
3632 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3633 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3634 * configuration and stop the clients as well. */
3635 if (link->setting_mtu)
3636 return 0;
3637
3638 r = link_stop_clients(link);
3639 if (r < 0) {
3640 link_enter_failed(link);
3641 return r;
3642 }
3643
3644 if (link_dhcp4_server_enabled(link))
3645 (void) sd_dhcp_server_stop(link->dhcp_server);
3646
3647 r = link_drop_config(link);
3648 if (r < 0)
3649 return r;
3650
3651 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3652 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3653 r = link_drop_foreign_config(link);
3654 if (r < 0)
3655 return r;
3656 }
3657
3658 r = link_handle_bound_by_list(link);
3659 if (r < 0)
3660 return r;
3661
3662 return 0;
3663 }
3664
3665 int link_carrier_reset(Link *link) {
3666 int r;
3667
3668 assert(link);
3669
3670 if (link_has_carrier(link)) {
3671 r = link_carrier_lost(link);
3672 if (r < 0)
3673 return r;
3674
3675 r = link_carrier_gained(link);
3676 if (r < 0)
3677 return r;
3678
3679 log_link_info(link, "Reset carrier");
3680 }
3681
3682 return 0;
3683 }
3684
3685 int link_update(Link *link, sd_netlink_message *m) {
3686 struct ether_addr mac;
3687 const char *ifname;
3688 uint32_t mtu;
3689 bool had_carrier, carrier_gained, carrier_lost;
3690 int r;
3691
3692 assert(link);
3693 assert(link->ifname);
3694 assert(m);
3695
3696 if (link->state == LINK_STATE_LINGER) {
3697 log_link_info(link, "Link re-added");
3698 link_set_state(link, LINK_STATE_CONFIGURING);
3699
3700 r = link_new_carrier_maps(link);
3701 if (r < 0)
3702 return r;
3703 }
3704
3705 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3706 if (r >= 0 && !streq(ifname, link->ifname)) {
3707 Manager *manager = link->manager;
3708
3709 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3710
3711 link_drop(link);
3712 r = link_add(manager, m, &link);
3713 if (r < 0)
3714 return r;
3715 }
3716
3717 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3718 if (r >= 0 && mtu > 0) {
3719 link->mtu = mtu;
3720 if (link->original_mtu == 0) {
3721 link->original_mtu = mtu;
3722 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3723 }
3724
3725 if (link->dhcp_client) {
3726 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3727 link->mtu);
3728 if (r < 0)
3729 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3730 }
3731
3732 if (link->radv) {
3733 r = sd_radv_set_mtu(link->radv, link->mtu);
3734 if (r < 0)
3735 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3736 }
3737 }
3738
3739 /* The kernel may broadcast NEWLINK messages without the MAC address
3740 set, simply ignore them. */
3741 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3742 if (r >= 0) {
3743 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3744 ETH_ALEN)) {
3745
3746 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3747 ETH_ALEN);
3748
3749 log_link_debug(link, "MAC address: "
3750 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3751 mac.ether_addr_octet[0],
3752 mac.ether_addr_octet[1],
3753 mac.ether_addr_octet[2],
3754 mac.ether_addr_octet[3],
3755 mac.ether_addr_octet[4],
3756 mac.ether_addr_octet[5]);
3757
3758 if (link->ipv4ll) {
3759 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3760 if (r < 0)
3761 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3762 }
3763
3764 if (link->dhcp_client) {
3765 r = sd_dhcp_client_set_mac(link->dhcp_client,
3766 (const uint8_t *) &link->mac,
3767 sizeof (link->mac),
3768 ARPHRD_ETHER);
3769 if (r < 0)
3770 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3771
3772 r = dhcp4_set_client_identifier(link);
3773 if (r < 0)
3774 return r;
3775 }
3776
3777 if (link->dhcp6_client) {
3778 const DUID* duid = link_get_duid(link);
3779
3780 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3781 (const uint8_t *) &link->mac,
3782 sizeof (link->mac),
3783 ARPHRD_ETHER);
3784 if (r < 0)
3785 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3786
3787 if (link->network->iaid_set) {
3788 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3789 link->network->iaid);
3790 if (r < 0)
3791 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3792 }
3793
3794 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3795 duid->type,
3796 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3797 duid->raw_data_len);
3798 if (r < 0)
3799 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3800 }
3801
3802 if (link->radv) {
3803 r = sd_radv_set_mac(link->radv, &link->mac);
3804 if (r < 0)
3805 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3806 }
3807
3808 if (link->ndisc) {
3809 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3810 if (r < 0)
3811 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3812 }
3813 }
3814 }
3815
3816 had_carrier = link_has_carrier(link);
3817
3818 r = link_update_flags(link, m);
3819 if (r < 0)
3820 return r;
3821
3822 r = link_update_lldp(link);
3823 if (r < 0)
3824 return r;
3825
3826 carrier_gained = !had_carrier && link_has_carrier(link);
3827 carrier_lost = had_carrier && !link_has_carrier(link);
3828
3829 if (carrier_gained) {
3830 log_link_info(link, "Gained carrier");
3831
3832 r = link_carrier_gained(link);
3833 if (r < 0)
3834 return r;
3835 } else if (carrier_lost) {
3836 log_link_info(link, "Lost carrier");
3837
3838 r = link_carrier_lost(link);
3839 if (r < 0)
3840 return r;
3841 }
3842
3843 return 0;
3844 }
3845
3846 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3847 bool space = false;
3848 Iterator i;
3849 Link *link;
3850
3851 assert(f);
3852 assert(prefix);
3853
3854 if (hashmap_isempty(h))
3855 return;
3856
3857 fputs(prefix, f);
3858 HASHMAP_FOREACH(link, h, i) {
3859 if (space)
3860 fputc(' ', f);
3861
3862 fprintf(f, "%i", link->ifindex);
3863 space = true;
3864 }
3865
3866 fputc('\n', f);
3867 }
3868
3869 int link_save(Link *link) {
3870 _cleanup_free_ char *temp_path = NULL;
3871 _cleanup_fclose_ FILE *f = NULL;
3872 const char *admin_state, *oper_state;
3873 Address *a;
3874 Route *route;
3875 Iterator i;
3876 int r;
3877
3878 assert(link);
3879 assert(link->state_file);
3880 assert(link->lease_file);
3881 assert(link->manager);
3882
3883 if (link->state == LINK_STATE_LINGER) {
3884 (void) unlink(link->state_file);
3885 return 0;
3886 }
3887
3888 link_lldp_save(link);
3889
3890 admin_state = link_state_to_string(link->state);
3891 assert(admin_state);
3892
3893 oper_state = link_operstate_to_string(link->operstate);
3894 assert(oper_state);
3895
3896 r = fopen_temporary(link->state_file, &f, &temp_path);
3897 if (r < 0)
3898 goto fail;
3899
3900 (void) fchmod(fileno(f), 0644);
3901
3902 fprintf(f,
3903 "# This is private data. Do not parse.\n"
3904 "ADMIN_STATE=%s\n"
3905 "OPER_STATE=%s\n",
3906 admin_state, oper_state);
3907
3908 if (link->network) {
3909 bool space;
3910 sd_dhcp6_lease *dhcp6_lease = NULL;
3911 const char *dhcp_domainname = NULL;
3912 char **dhcp6_domains = NULL;
3913 char **dhcp_domains = NULL;
3914 unsigned j;
3915
3916 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3917 yes_no(link->network->required_for_online));
3918
3919 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
3920 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
3921
3922 if (link->dhcp6_client) {
3923 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3924 if (r < 0 && r != -ENOMSG)
3925 log_link_debug(link, "No DHCPv6 lease");
3926 }
3927
3928 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3929
3930 fputs("DNS=", f);
3931 space = false;
3932
3933 for (j = 0; j < link->network->n_dns; j++) {
3934 _cleanup_free_ char *b = NULL;
3935
3936 r = in_addr_to_string(link->network->dns[j].family,
3937 &link->network->dns[j].address, &b);
3938 if (r < 0) {
3939 log_debug_errno(r, "Failed to format address, ignoring: %m");
3940 continue;
3941 }
3942
3943 if (space)
3944 fputc(' ', f);
3945 fputs(b, f);
3946 space = true;
3947 }
3948
3949 if (link->network->dhcp_use_dns &&
3950 link->dhcp_lease) {
3951 const struct in_addr *addresses;
3952
3953 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3954 if (r > 0)
3955 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3956 space = true;
3957 }
3958
3959 if (link->network->dhcp_use_dns && dhcp6_lease) {
3960 struct in6_addr *in6_addrs;
3961
3962 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3963 if (r > 0) {
3964 if (space)
3965 fputc(' ', f);
3966 serialize_in6_addrs(f, in6_addrs, r);
3967 space = true;
3968 }
3969 }
3970
3971 /* Make sure to flush out old entries before we use the NDISC data */
3972 ndisc_vacuum(link);
3973
3974 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3975 NDiscRDNSS *dd;
3976
3977 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3978 if (space)
3979 fputc(' ', f);
3980
3981 serialize_in6_addrs(f, &dd->address, 1);
3982 space = true;
3983 }
3984 }
3985
3986 fputc('\n', f);
3987
3988 fputs("NTP=", f);
3989 space = false;
3990 fputstrv(f, link->network->ntp, NULL, &space);
3991
3992 if (link->network->dhcp_use_ntp &&
3993 link->dhcp_lease) {
3994 const struct in_addr *addresses;
3995
3996 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3997 if (r > 0)
3998 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3999 space = true;
4000 }
4001
4002 if (link->network->dhcp_use_ntp && dhcp6_lease) {
4003 struct in6_addr *in6_addrs;
4004 char **hosts;
4005
4006 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
4007 &in6_addrs);
4008 if (r > 0) {
4009 if (space)
4010 fputc(' ', f);
4011 serialize_in6_addrs(f, in6_addrs, r);
4012 space = true;
4013 }
4014
4015 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
4016 if (r > 0)
4017 fputstrv(f, hosts, NULL, &space);
4018 }
4019
4020 fputc('\n', f);
4021
4022 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4023 if (link->dhcp_lease) {
4024 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4025 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4026 }
4027 if (dhcp6_lease)
4028 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4029 }
4030
4031 ordered_set_print(f, "DOMAINS=", link->network->search_domains);
4032
4033 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4034 NDiscDNSSL *dd;
4035
4036 if (dhcp_domainname)
4037 fputs_with_space(f, dhcp_domainname, NULL, &space);
4038 if (dhcp_domains)
4039 fputstrv(f, dhcp_domains, NULL, &space);
4040 if (dhcp6_domains)
4041 fputstrv(f, dhcp6_domains, NULL, &space);
4042
4043 SET_FOREACH(dd, link->ndisc_dnssl, i)
4044 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4045 }
4046
4047 fputc('\n', f);
4048
4049 ordered_set_print(f, "ROUTE_DOMAINS=", link->network->route_domains);
4050
4051 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4052 NDiscDNSSL *dd;
4053
4054 if (dhcp_domainname)
4055 fputs_with_space(f, dhcp_domainname, NULL, &space);
4056 if (dhcp_domains)
4057 fputstrv(f, dhcp_domains, NULL, &space);
4058 if (dhcp6_domains)
4059 fputstrv(f, dhcp6_domains, NULL, &space);
4060
4061 SET_FOREACH(dd, link->ndisc_dnssl, i)
4062 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4063 }
4064
4065 fputc('\n', f);
4066
4067 fprintf(f, "LLMNR=%s\n",
4068 resolve_support_to_string(link->network->llmnr));
4069 fprintf(f, "MDNS=%s\n",
4070 resolve_support_to_string(link->network->mdns));
4071 if (link->network->dns_default_route >= 0)
4072 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
4073
4074 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4075 fprintf(f, "DNS_OVER_TLS=%s\n",
4076 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
4077
4078 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
4079 fprintf(f, "DNSSEC=%s\n",
4080 dnssec_mode_to_string(link->network->dnssec_mode));
4081
4082 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
4083 const char *n;
4084
4085 fputs("DNSSEC_NTA=", f);
4086 space = false;
4087 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
4088 fputs_with_space(f, n, NULL, &space);
4089 fputc('\n', f);
4090 }
4091
4092 fputs("ADDRESSES=", f);
4093 space = false;
4094 SET_FOREACH(a, link->addresses, i) {
4095 _cleanup_free_ char *address_str = NULL;
4096
4097 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4098 if (r < 0)
4099 goto fail;
4100
4101 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4102 space = true;
4103 }
4104 fputc('\n', f);
4105
4106 fputs("ROUTES=", f);
4107 space = false;
4108 SET_FOREACH(route, link->routes, i) {
4109 _cleanup_free_ char *route_str = NULL;
4110
4111 r = in_addr_to_string(route->family, &route->dst, &route_str);
4112 if (r < 0)
4113 goto fail;
4114
4115 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4116 space ? " " : "", route_str,
4117 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4118 space = true;
4119 }
4120
4121 fputc('\n', f);
4122 }
4123
4124 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4125 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4126
4127 if (link->dhcp_lease) {
4128 struct in_addr address;
4129 const char *tz = NULL;
4130
4131 assert(link->network);
4132
4133 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
4134 if (r >= 0)
4135 fprintf(f, "TIMEZONE=%s\n", tz);
4136
4137 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
4138 if (r >= 0) {
4139 fputs("DHCP4_ADDRESS=", f);
4140 serialize_in_addrs(f, &address, 1, false, NULL);
4141 fputc('\n', f);
4142 }
4143
4144 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4145 if (r < 0)
4146 goto fail;
4147
4148 fprintf(f,
4149 "DHCP_LEASE=%s\n",
4150 link->lease_file);
4151 } else
4152 (void) unlink(link->lease_file);
4153
4154 if (link->ipv4ll) {
4155 struct in_addr address;
4156
4157 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4158 if (r >= 0) {
4159 fputs("IPV4LL_ADDRESS=", f);
4160 serialize_in_addrs(f, &address, 1, false, NULL);
4161 fputc('\n', f);
4162 }
4163 }
4164
4165 r = fflush_and_check(f);
4166 if (r < 0)
4167 goto fail;
4168
4169 if (rename(temp_path, link->state_file) < 0) {
4170 r = -errno;
4171 goto fail;
4172 }
4173
4174 return 0;
4175
4176 fail:
4177 (void) unlink(link->state_file);
4178 if (temp_path)
4179 (void) unlink(temp_path);
4180
4181 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4182 }
4183
4184 /* The serialized state in /run is no longer up-to-date. */
4185 void link_dirty(Link *link) {
4186 int r;
4187
4188 assert(link);
4189
4190 /* mark manager dirty as link is dirty */
4191 manager_dirty(link->manager);
4192
4193 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
4194 if (r < 0)
4195 /* allocation errors are ignored */
4196 return;
4197
4198 r = set_put(link->manager->dirty_links, link);
4199 if (r <= 0)
4200 /* don't take another ref if the link was already dirty */
4201 return;
4202
4203 link_ref(link);
4204 }
4205
4206 /* The serialized state in /run is up-to-date */
4207 void link_clean(Link *link) {
4208 assert(link);
4209 assert(link->manager);
4210
4211 link_unref(set_remove(link->manager->dirty_links, link));
4212 }
4213
4214 static const char* const link_state_table[_LINK_STATE_MAX] = {
4215 [LINK_STATE_PENDING] = "pending",
4216 [LINK_STATE_INITIALIZED] = "initialized",
4217 [LINK_STATE_CONFIGURING] = "configuring",
4218 [LINK_STATE_CONFIGURED] = "configured",
4219 [LINK_STATE_UNMANAGED] = "unmanaged",
4220 [LINK_STATE_FAILED] = "failed",
4221 [LINK_STATE_LINGER] = "linger",
4222 };
4223
4224 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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