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network: tighten the condition whether link has carrier
[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 <unistd.h>
6
7 #include "alloc-util.h"
8 #include "bus-util.h"
9 #include "dhcp-identifier.h"
10 #include "dhcp-lease-internal.h"
11 #include "env-file.h"
12 #include "fd-util.h"
13 #include "fileio.h"
14 #include "missing_network.h"
15 #include "netdev/bond.h"
16 #include "netdev/bridge.h"
17 #include "netdev/vrf.h"
18 #include "netlink-util.h"
19 #include "network-internal.h"
20 #include "networkd-can.h"
21 #include "networkd-ipv6-proxy-ndp.h"
22 #include "networkd-lldp-tx.h"
23 #include "networkd-manager.h"
24 #include "networkd-ndisc.h"
25 #include "networkd-neighbor.h"
26 #include "networkd-radv.h"
27 #include "networkd-routing-policy-rule.h"
28 #include "set.h"
29 #include "socket-util.h"
30 #include "stdio-util.h"
31 #include "string-table.h"
32 #include "strv.h"
33 #include "sysctl-util.h"
34 #include "tmpfile-util.h"
35 #include "udev-util.h"
36 #include "util.h"
37 #include "virt.h"
38
39 uint32_t link_get_vrf_table(Link *link) {
40 return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
41 }
42
43 uint32_t link_get_dhcp_route_table(Link *link) {
44 /* When the interface is part of an VRF use the VRFs routing table, unless
45 * another table is explicitly specified. */
46 if (link->network->dhcp_route_table_set)
47 return link->network->dhcp_route_table;
48 return link_get_vrf_table(link);
49 }
50
51 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
52 if (link->network->ipv6_accept_ra_route_table_set)
53 return link->network->ipv6_accept_ra_route_table;
54 return link_get_vrf_table(link);
55 }
56
57 DUID* link_get_duid(Link *link) {
58 if (link->network->duid.type != _DUID_TYPE_INVALID)
59 return &link->network->duid;
60 else
61 return &link->manager->duid;
62 }
63
64 static bool link_dhcp6_enabled(Link *link) {
65 assert(link);
66
67 if (!socket_ipv6_is_supported())
68 return false;
69
70 if (link->flags & IFF_LOOPBACK)
71 return false;
72
73 if (!link->network)
74 return false;
75
76 if (link->network->bond)
77 return false;
78
79 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
80 return false;
81
82 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
83 }
84
85 static bool link_dhcp4_enabled(Link *link) {
86 assert(link);
87
88 if (link->flags & IFF_LOOPBACK)
89 return false;
90
91 if (!link->network)
92 return false;
93
94 if (link->network->bond)
95 return false;
96
97 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
98 }
99
100 static bool link_dhcp4_server_enabled(Link *link) {
101 assert(link);
102
103 if (link->flags & IFF_LOOPBACK)
104 return false;
105
106 if (!link->network)
107 return false;
108
109 if (link->network->bond)
110 return false;
111
112 return link->network->dhcp_server;
113 }
114
115 bool link_ipv4ll_enabled(Link *link) {
116 assert(link);
117
118 if (link->flags & IFF_LOOPBACK)
119 return false;
120
121 if (!link->network)
122 return false;
123
124 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "ip6gre", "ip6tnl", "sit", "vti", "vti6"))
125 return false;
126
127 if (link->network->bond)
128 return false;
129
130 return link->network->link_local & ADDRESS_FAMILY_IPV4;
131 }
132
133 bool link_ipv4ll_fallback_enabled(Link *link) {
134 assert(link);
135
136 if (link->flags & IFF_LOOPBACK)
137 return false;
138
139 if (!link->network)
140 return false;
141
142 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "ip6gre", "ip6tnl", "sit", "vti", "vti6"))
143 return false;
144
145 if (link->network->bond)
146 return false;
147
148 return link->network->link_local & ADDRESS_FAMILY_FALLBACK_IPV4;
149 }
150
151 static bool link_ipv6ll_enabled(Link *link) {
152 assert(link);
153
154 if (!socket_ipv6_is_supported())
155 return false;
156
157 if (link->flags & IFF_LOOPBACK)
158 return false;
159
160 if (!link->network)
161 return false;
162
163 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "sit", "vti"))
164 return false;
165
166 if (link->network->bond)
167 return false;
168
169 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
170 return false;
171
172 return link->network->link_local & ADDRESS_FAMILY_IPV6;
173 }
174
175 static bool link_ipv6_enabled(Link *link) {
176 assert(link);
177
178 if (!socket_ipv6_is_supported())
179 return false;
180
181 if (link->network->bond)
182 return false;
183
184 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
185 return false;
186
187 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
188 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
189 }
190
191 static bool link_radv_enabled(Link *link) {
192 assert(link);
193
194 if (!link_ipv6ll_enabled(link))
195 return false;
196
197 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
198 }
199
200 static bool link_ipv4_forward_enabled(Link *link) {
201 assert(link);
202
203 if (link->flags & IFF_LOOPBACK)
204 return false;
205
206 if (!link->network)
207 return false;
208
209 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
210 return false;
211
212 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
213 }
214
215 static bool link_ipv6_forward_enabled(Link *link) {
216 assert(link);
217
218 if (!socket_ipv6_is_supported())
219 return false;
220
221 if (link->flags & IFF_LOOPBACK)
222 return false;
223
224 if (!link->network)
225 return false;
226
227 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
228 return false;
229
230 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
231 return false;
232
233 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
234 }
235
236 static bool link_proxy_arp_enabled(Link *link) {
237 assert(link);
238
239 if (link->flags & IFF_LOOPBACK)
240 return false;
241
242 if (!link->network)
243 return false;
244
245 if (link->network->proxy_arp < 0)
246 return false;
247
248 return true;
249 }
250
251 static bool link_ipv6_accept_ra_enabled(Link *link) {
252 assert(link);
253
254 if (!socket_ipv6_is_supported())
255 return false;
256
257 if (link->flags & IFF_LOOPBACK)
258 return false;
259
260 if (!link->network)
261 return false;
262
263 if (!link_ipv6ll_enabled(link))
264 return false;
265
266 /* If unset use system default (enabled if local forwarding is disabled.
267 * disabled if local forwarding is enabled).
268 * If set, ignore or enforce RA independent of local forwarding state.
269 */
270 if (link->network->ipv6_accept_ra < 0)
271 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
272 return !link_ipv6_forward_enabled(link);
273 else if (link->network->ipv6_accept_ra > 0)
274 /* accept RA even if ip_forward is enabled */
275 return true;
276 else
277 /* ignore RA */
278 return false;
279 }
280
281 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
282 assert(link);
283
284 if (!socket_ipv6_is_supported())
285 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
286
287 if (link->flags & IFF_LOOPBACK)
288 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
289
290 if (!link->network)
291 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
292
293 return link->network->ipv6_privacy_extensions;
294 }
295
296 static int link_enable_ipv6(Link *link) {
297 bool disabled;
298 int r;
299
300 if (link->flags & IFF_LOOPBACK)
301 return 0;
302
303 disabled = !link_ipv6_enabled(link);
304
305 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", disabled);
306 if (r < 0)
307 log_link_warning_errno(link, r, "Cannot %s IPv6: %m", enable_disable(!disabled));
308 else
309 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
310
311 return 0;
312 }
313
314 static bool link_is_enslaved(Link *link) {
315 if (link->flags & IFF_SLAVE)
316 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
317 return true;
318
319 if (!link->enslaved_raw)
320 return false;
321
322 if (!link->network)
323 return false;
324
325 if (link->network->bridge)
326 /* TODO: support the case when link is not managed by networkd. */
327 return true;
328
329 return false;
330 }
331
332 static void link_update_master_operstate(Link *link, NetDev *netdev) {
333 Link *master;
334
335 if (!netdev)
336 return;
337
338 if (link_get(link->manager, netdev->ifindex, &master) < 0)
339 return;
340
341 link_update_operstate(master, true);
342 }
343
344 void link_update_operstate(Link *link, bool also_update_master) {
345 LinkOperationalState operstate;
346 Iterator i;
347
348 assert(link);
349
350 if (link->kernel_operstate == IF_OPER_DORMANT)
351 operstate = LINK_OPERSTATE_DORMANT;
352 else if (link_has_carrier(link)) {
353 Address *address;
354 uint8_t scope = RT_SCOPE_NOWHERE;
355
356 /* if we have carrier, check what addresses we have */
357 SET_FOREACH(address, link->addresses, i) {
358 if (!address_is_ready(address))
359 continue;
360
361 if (address->scope < scope)
362 scope = address->scope;
363 }
364
365 /* for operstate we also take foreign addresses into account */
366 SET_FOREACH(address, link->addresses_foreign, i) {
367 if (!address_is_ready(address))
368 continue;
369
370 if (address->scope < scope)
371 scope = address->scope;
372 }
373
374 if (scope < RT_SCOPE_SITE)
375 /* universally accessible addresses found */
376 operstate = LINK_OPERSTATE_ROUTABLE;
377 else if (scope < RT_SCOPE_HOST)
378 /* only link or site local addresses found */
379 operstate = LINK_OPERSTATE_DEGRADED;
380 else
381 /* no useful addresses found */
382 operstate = LINK_OPERSTATE_CARRIER;
383 } else if (link->flags & IFF_UP)
384 operstate = LINK_OPERSTATE_NO_CARRIER;
385 else
386 operstate = LINK_OPERSTATE_OFF;
387
388 if (IN_SET(operstate, LINK_OPERSTATE_DEGRADED, LINK_OPERSTATE_CARRIER) &&
389 link_is_enslaved(link))
390 operstate = LINK_OPERSTATE_ENSLAVED;
391
392 if (operstate >= LINK_OPERSTATE_CARRIER) {
393 Link *slave;
394
395 SET_FOREACH(slave, link->slaves, i) {
396 link_update_operstate(slave, false);
397
398 if (slave->operstate < LINK_OPERSTATE_CARRIER)
399 operstate = LINK_OPERSTATE_DEGRADED_CARRIER;
400 }
401 }
402
403 if (link->operstate != operstate) {
404 link->operstate = operstate;
405 link_send_changed(link, "OperationalState", NULL);
406 link_dirty(link);
407 }
408
409 if (also_update_master && link->network) {
410 link_update_master_operstate(link, link->network->bond);
411 link_update_master_operstate(link, link->network->bridge);
412 }
413 }
414
415 #define FLAG_STRING(string, flag, old, new) \
416 (((old ^ new) & flag) \
417 ? ((old & flag) ? (" -" string) : (" +" string)) \
418 : "")
419
420 static int link_update_flags(Link *link, sd_netlink_message *m) {
421 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
422 uint8_t operstate;
423 int r;
424
425 assert(link);
426
427 r = sd_rtnl_message_link_get_flags(m, &flags);
428 if (r < 0)
429 return log_link_warning_errno(link, r, "Could not get link flags: %m");
430
431 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
432 if (r < 0)
433 /* if we got a message without operstate, take it to mean
434 the state was unchanged */
435 operstate = link->kernel_operstate;
436
437 if ((link->flags == flags) && (link->kernel_operstate == operstate))
438 return 0;
439
440 if (link->flags != flags) {
441 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",
442 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
443 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
444 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
445 FLAG_STRING("UP", IFF_UP, link->flags, flags),
446 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
447 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
448 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
449 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
450 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
451 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
452 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
453 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
454 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
455 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
456 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
457 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
458 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
459 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
460 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
461
462 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
463 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
464 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
465 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
466 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
467 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
468 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
469 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
470
471 /* link flags are currently at most 18 bits, let's align to
472 * printing 20 */
473 if (unknown_flags_added)
474 log_link_debug(link,
475 "Unknown link flags gained: %#.5x (ignoring)",
476 unknown_flags_added);
477
478 if (unknown_flags_removed)
479 log_link_debug(link,
480 "Unknown link flags lost: %#.5x (ignoring)",
481 unknown_flags_removed);
482 }
483
484 link->flags = flags;
485 link->kernel_operstate = operstate;
486
487 link_update_operstate(link, true);
488
489 return 0;
490 }
491
492 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
493 _cleanup_(link_unrefp) Link *link = NULL;
494 uint16_t type;
495 const char *ifname, *kind = NULL;
496 int r, ifindex;
497 unsigned short iftype;
498
499 assert(manager);
500 assert(message);
501 assert(ret);
502
503 /* check for link kind */
504 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
505 if (r == 0) {
506 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
507 r = sd_netlink_message_exit_container(message);
508 if (r < 0)
509 return r;
510 }
511
512 r = sd_netlink_message_get_type(message, &type);
513 if (r < 0)
514 return r;
515 else if (type != RTM_NEWLINK)
516 return -EINVAL;
517
518 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
519 if (r < 0)
520 return r;
521 else if (ifindex <= 0)
522 return -EINVAL;
523
524 r = sd_rtnl_message_link_get_type(message, &iftype);
525 if (r < 0)
526 return r;
527
528 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
529 if (r < 0)
530 return r;
531
532 link = new(Link, 1);
533 if (!link)
534 return -ENOMEM;
535
536 *link = (Link) {
537 .n_ref = 1,
538 .manager = manager,
539 .state = LINK_STATE_PENDING,
540 .rtnl_extended_attrs = true,
541 .ifindex = ifindex,
542 .iftype = iftype,
543 };
544
545 link->ifname = strdup(ifname);
546 if (!link->ifname)
547 return -ENOMEM;
548
549 if (kind) {
550 link->kind = strdup(kind);
551 if (!link->kind)
552 return -ENOMEM;
553 }
554
555 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
556 if (r < 0)
557 log_link_debug_errno(link, r, "New device has no master, continuing without");
558
559 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
560 if (r < 0)
561 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
562
563 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
564 return -ENOMEM;
565
566 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
567 return -ENOMEM;
568
569 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
570 return -ENOMEM;
571
572 r = hashmap_ensure_allocated(&manager->links, NULL);
573 if (r < 0)
574 return r;
575
576 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
577 if (r < 0)
578 return r;
579
580 r = link_update_flags(link, message);
581 if (r < 0)
582 return r;
583
584 *ret = TAKE_PTR(link);
585
586 return 0;
587 }
588
589 static Link *link_free(Link *link) {
590 Address *address;
591
592 assert(link);
593
594 link->routes = set_free_with_destructor(link->routes, route_free);
595 link->routes_foreign = set_free_with_destructor(link->routes_foreign, route_free);
596
597 link->addresses = set_free_with_destructor(link->addresses, address_free);
598 link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free);
599
600 while ((address = link->pool_addresses)) {
601 LIST_REMOVE(addresses, link->pool_addresses, address);
602 address_free(address);
603 }
604
605 sd_dhcp_server_unref(link->dhcp_server);
606 sd_dhcp_client_unref(link->dhcp_client);
607 sd_dhcp_lease_unref(link->dhcp_lease);
608
609 link_lldp_emit_stop(link);
610
611 free(link->lease_file);
612
613 sd_lldp_unref(link->lldp);
614 free(link->lldp_file);
615
616 ndisc_flush(link);
617
618 sd_ipv4ll_unref(link->ipv4ll);
619 sd_dhcp6_client_unref(link->dhcp6_client);
620 sd_ndisc_unref(link->ndisc);
621 sd_radv_unref(link->radv);
622
623 free(link->ifname);
624 free(link->kind);
625
626 (void) unlink(link->state_file);
627 free(link->state_file);
628
629 sd_device_unref(link->sd_device);
630
631 hashmap_free(link->bound_to_links);
632 hashmap_free(link->bound_by_links);
633
634 set_free_with_destructor(link->slaves, link_unref);
635
636 network_unref(link->network);
637
638 return mfree(link);
639 }
640
641 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
642
643 int link_get(Manager *m, int ifindex, Link **ret) {
644 Link *link;
645
646 assert(m);
647 assert(ifindex);
648 assert(ret);
649
650 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
651 if (!link)
652 return -ENODEV;
653
654 *ret = link;
655
656 return 0;
657 }
658
659 static void link_set_state(Link *link, LinkState state) {
660 assert(link);
661
662 if (link->state == state)
663 return;
664
665 log_link_debug(link, "State changed: %s -> %s",
666 link_state_to_string(link->state),
667 link_state_to_string(state));
668
669 link->state = state;
670
671 link_send_changed(link, "AdministrativeState", NULL);
672 }
673
674 static void link_enter_unmanaged(Link *link) {
675 assert(link);
676
677 log_link_debug(link, "Unmanaged");
678
679 link_set_state(link, LINK_STATE_UNMANAGED);
680
681 link_dirty(link);
682 }
683
684 int link_stop_clients(Link *link) {
685 int r = 0, k;
686
687 assert(link);
688 assert(link->manager);
689 assert(link->manager->event);
690
691 if (link->dhcp_client) {
692 k = sd_dhcp_client_stop(link->dhcp_client);
693 if (k < 0)
694 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
695 }
696
697 if (link->ipv4ll) {
698 k = sd_ipv4ll_stop(link->ipv4ll);
699 if (k < 0)
700 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
701 }
702
703 if (link->dhcp6_client) {
704 k = sd_dhcp6_client_stop(link->dhcp6_client);
705 if (k < 0)
706 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
707 }
708
709 if (link->ndisc) {
710 k = sd_ndisc_stop(link->ndisc);
711 if (k < 0)
712 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
713 }
714
715 if (link->radv) {
716 k = sd_radv_stop(link->radv);
717 if (k < 0)
718 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
719 }
720
721 link_lldp_emit_stop(link);
722 return r;
723 }
724
725 void link_enter_failed(Link *link) {
726 assert(link);
727
728 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
729 return;
730
731 log_link_warning(link, "Failed");
732
733 link_set_state(link, LINK_STATE_FAILED);
734
735 link_stop_clients(link);
736
737 link_dirty(link);
738 }
739
740 static Address* link_find_dhcp_server_address(Link *link) {
741 Address *address;
742
743 assert(link);
744 assert(link->network);
745
746 /* The first statically configured address if there is any */
747 LIST_FOREACH(addresses, address, link->network->static_addresses) {
748
749 if (address->family != AF_INET)
750 continue;
751
752 if (in_addr_is_null(address->family, &address->in_addr))
753 continue;
754
755 return address;
756 }
757
758 /* If that didn't work, find a suitable address we got from the pool */
759 LIST_FOREACH(addresses, address, link->pool_addresses) {
760 if (address->family != AF_INET)
761 continue;
762
763 return address;
764 }
765
766 return NULL;
767 }
768
769 static int link_join_netdevs_after_configured(Link *link) {
770 NetDev *netdev;
771 Iterator i;
772 int r;
773
774 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
775 if (netdev->ifindex > 0)
776 /* Assume already enslaved. */
777 continue;
778
779 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
780 continue;
781
782 log_struct(LOG_DEBUG,
783 LOG_LINK_INTERFACE(link),
784 LOG_NETDEV_INTERFACE(netdev),
785 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
786
787 r = netdev_join(netdev, link, NULL);
788 if (r < 0)
789 return log_struct_errno(LOG_WARNING, r,
790 LOG_LINK_INTERFACE(link),
791 LOG_NETDEV_INTERFACE(netdev),
792 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
793 }
794
795 return 0;
796 }
797
798 static void link_enter_configured(Link *link) {
799 assert(link);
800 assert(link->network);
801
802 if (link->state != LINK_STATE_CONFIGURING)
803 return;
804
805 log_link_info(link, "Configured");
806
807 link_set_state(link, LINK_STATE_CONFIGURED);
808
809 (void) link_join_netdevs_after_configured(link);
810
811 link_dirty(link);
812 }
813
814 static int link_request_set_routing_policy_rule(Link *link) {
815 RoutingPolicyRule *rule, *rrule = NULL;
816 int r;
817
818 assert(link);
819 assert(link->network);
820
821 link_set_state(link, LINK_STATE_CONFIGURING);
822 link->routing_policy_rules_configured = false;
823
824 LIST_FOREACH(rules, rule, link->network->rules) {
825 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
826 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif,
827 rule->protocol, &rule->sport, &rule->dport, &rrule);
828 if (r == 0) {
829 (void) routing_policy_rule_make_local(link->manager, rrule);
830 continue;
831 }
832
833 r = routing_policy_rule_configure(rule, link, NULL, false);
834 if (r < 0) {
835 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
836 link_enter_failed(link);
837 return r;
838 }
839
840 link->routing_policy_rule_messages++;
841 }
842
843 routing_policy_rule_purge(link->manager, link);
844 if (link->routing_policy_rule_messages == 0) {
845 link->routing_policy_rules_configured = true;
846 link_check_ready(link);
847 } else
848 log_link_debug(link, "Setting routing policy rules");
849
850 return 0;
851 }
852
853 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
854 int r;
855
856 assert(link);
857 assert(link->route_messages > 0);
858 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
859 LINK_STATE_FAILED, LINK_STATE_LINGER));
860
861 link->route_messages--;
862
863 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
864 return 1;
865
866 r = sd_netlink_message_get_errno(m);
867 if (r < 0 && r != -EEXIST)
868 log_link_warning_errno(link, r, "Could not set route: %m");
869
870 if (link->route_messages == 0) {
871 log_link_debug(link, "Routes set");
872 link->static_routes_configured = true;
873 link_check_ready(link);
874 }
875
876 return 1;
877 }
878
879 int link_request_set_routes(Link *link) {
880 enum {
881 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
882 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
883 _PHASE_MAX
884 } phase;
885 Route *rt;
886 int r;
887
888 assert(link);
889 assert(link->network);
890 assert(link->addresses_configured);
891 assert(link->address_messages == 0);
892 assert(link->state != _LINK_STATE_INVALID);
893
894 link_set_state(link, LINK_STATE_CONFIGURING);
895 link->static_routes_configured = false;
896
897 r = link_request_set_routing_policy_rule(link);
898 if (r < 0)
899 return r;
900
901 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
902 for (phase = 0; phase < _PHASE_MAX; phase++)
903 LIST_FOREACH(routes, rt, link->network->static_routes) {
904
905 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
906 continue;
907
908 r = route_configure(rt, link, route_handler);
909 if (r < 0) {
910 log_link_warning_errno(link, r, "Could not set routes: %m");
911 link_enter_failed(link);
912 return r;
913 }
914
915 link->route_messages++;
916 }
917
918 if (link->route_messages == 0) {
919 link->static_routes_configured = true;
920 link_check_ready(link);
921 } else
922 log_link_debug(link, "Setting routes");
923
924 return 0;
925 }
926
927 void link_check_ready(Link *link) {
928 Address *a;
929 Iterator i;
930
931 assert(link);
932
933 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
934 return;
935
936 if (!link->network)
937 return;
938
939 if (!link->addresses_configured)
940 return;
941
942 if (!link->neighbors_configured)
943 return;
944
945 SET_FOREACH(a, link->addresses, i)
946 if (!address_is_ready(a))
947 return;
948
949 if (!link->addresses_ready) {
950 link->addresses_ready = true;
951 link_request_set_routes(link);
952 return;
953 }
954
955 if (!link->static_routes_configured)
956 return;
957
958 if (!link->routing_policy_rules_configured)
959 return;
960
961 if (link_ipv4ll_enabled(link) && !(link->ipv4ll_address && link->ipv4ll_route))
962 return;
963
964 if (link_ipv6ll_enabled(link) &&
965 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
966 return;
967
968 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
969 !(link->dhcp4_configured || link->dhcp6_configured) &&
970 !(link_ipv4ll_fallback_enabled(link) && link->ipv4ll_address && link->ipv4ll_route))
971 /* When DHCP is enabled, at least one protocol must provide an address, or
972 * an IPv4ll fallback address must be configured. */
973 return;
974
975 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
976 return;
977
978 if (link->state != LINK_STATE_CONFIGURED)
979 link_enter_configured(link);
980
981 return;
982 }
983
984 static int link_request_set_neighbors(Link *link) {
985 Neighbor *neighbor;
986 int r;
987
988 assert(link);
989 assert(link->network);
990 assert(link->state != _LINK_STATE_INVALID);
991
992 link_set_state(link, LINK_STATE_CONFIGURING);
993 link->neighbors_configured = false;
994
995 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
996 r = neighbor_configure(neighbor, link, NULL);
997 if (r < 0) {
998 log_link_warning_errno(link, r, "Could not set neighbor: %m");
999 link_enter_failed(link);
1000 return r;
1001 }
1002 }
1003
1004 if (link->neighbor_messages == 0) {
1005 link->neighbors_configured = true;
1006 link_check_ready(link);
1007 } else
1008 log_link_debug(link, "Setting neighbors");
1009
1010 return 0;
1011 }
1012
1013 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1014 int r;
1015
1016 assert(rtnl);
1017 assert(m);
1018 assert(link);
1019 assert(link->ifname);
1020 assert(link->address_messages > 0);
1021 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1022 LINK_STATE_FAILED, LINK_STATE_LINGER));
1023
1024 link->address_messages--;
1025
1026 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1027 return 1;
1028
1029 r = sd_netlink_message_get_errno(m);
1030 if (r < 0 && r != -EEXIST)
1031 log_link_warning_errno(link, r, "could not set address: %m");
1032 else if (r >= 0)
1033 manager_rtnl_process_address(rtnl, m, link->manager);
1034
1035 if (link->address_messages == 0) {
1036 log_link_debug(link, "Addresses set");
1037 link->addresses_configured = true;
1038 link_check_ready(link);
1039 }
1040
1041 return 1;
1042 }
1043
1044 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1045 _cleanup_free_ struct in_addr *addresses = NULL;
1046 size_t n_addresses = 0, n_allocated = 0;
1047 unsigned i;
1048
1049 log_debug("Copying DNS server information from %s", link->ifname);
1050
1051 if (!link->network)
1052 return 0;
1053
1054 for (i = 0; i < link->network->n_dns; i++) {
1055 struct in_addr ia;
1056
1057 /* Only look for IPv4 addresses */
1058 if (link->network->dns[i].family != AF_INET)
1059 continue;
1060
1061 ia = link->network->dns[i].address.in;
1062
1063 /* Never propagate obviously borked data */
1064 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1065 continue;
1066
1067 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1068 return log_oom();
1069
1070 addresses[n_addresses++] = ia;
1071 }
1072
1073 if (link->network->dhcp_use_dns && link->dhcp_lease) {
1074 const struct in_addr *da = NULL;
1075 int j, n;
1076
1077 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
1078 if (n > 0) {
1079
1080 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1081 return log_oom();
1082
1083 for (j = 0; j < n; j++)
1084 if (in4_addr_is_non_local(&da[j]))
1085 addresses[n_addresses++] = da[j];
1086 }
1087 }
1088
1089 if (n_addresses <= 0)
1090 return 0;
1091
1092 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
1093 }
1094
1095 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1096 _cleanup_free_ struct in_addr *addresses = NULL;
1097 size_t n_addresses = 0, n_allocated = 0;
1098 char **a;
1099
1100 if (!link->network)
1101 return 0;
1102
1103 log_debug("Copying NTP server information from %s", link->ifname);
1104
1105 STRV_FOREACH(a, link->network->ntp) {
1106 union in_addr_union ia;
1107
1108 /* Only look for IPv4 addresses */
1109 if (in_addr_from_string(AF_INET, *a, &ia) <= 0)
1110 continue;
1111
1112 /* Never propagate obviously borked data */
1113 if (in4_addr_is_null(&ia.in) || in4_addr_is_localhost(&ia.in))
1114 continue;
1115
1116 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1117 return log_oom();
1118
1119 addresses[n_addresses++] = ia.in;
1120 }
1121
1122 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1123 const struct in_addr *da = NULL;
1124 int j, n;
1125
1126 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1127 if (n > 0) {
1128
1129 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1130 return log_oom();
1131
1132 for (j = 0; j < n; j++)
1133 if (in4_addr_is_non_local(&da[j]))
1134 addresses[n_addresses++] = da[j];
1135 }
1136 }
1137
1138 if (n_addresses <= 0)
1139 return 0;
1140
1141 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1142 }
1143
1144 static int link_set_bridge_fdb(Link *link) {
1145 FdbEntry *fdb_entry;
1146 int r;
1147
1148 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1149 r = fdb_entry_configure(link, fdb_entry);
1150 if (r < 0)
1151 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1152 }
1153
1154 return 0;
1155 }
1156
1157 static int link_request_set_addresses(Link *link) {
1158 AddressLabel *label;
1159 Address *ad;
1160 int r;
1161
1162 assert(link);
1163 assert(link->network);
1164 assert(link->state != _LINK_STATE_INVALID);
1165
1166 link_set_state(link, LINK_STATE_CONFIGURING);
1167
1168 /* Reset all *_configured flags we are configuring. */
1169 link->addresses_configured = false;
1170 link->addresses_ready = false;
1171 link->neighbors_configured = false;
1172 link->static_routes_configured = false;
1173 link->routing_policy_rules_configured = false;
1174
1175 r = link_set_bridge_fdb(link);
1176 if (r < 0)
1177 return r;
1178
1179 r = link_request_set_neighbors(link);
1180 if (r < 0)
1181 return r;
1182
1183 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1184 bool update;
1185
1186 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1187
1188 r = address_configure(ad, link, address_handler, update);
1189 if (r < 0) {
1190 log_link_warning_errno(link, r, "Could not set addresses: %m");
1191 link_enter_failed(link);
1192 return r;
1193 }
1194
1195 link->address_messages++;
1196 }
1197
1198 LIST_FOREACH(labels, label, link->network->address_labels) {
1199 r = address_label_configure(label, link, NULL, false);
1200 if (r < 0) {
1201 log_link_warning_errno(link, r, "Could not set address label: %m");
1202 link_enter_failed(link);
1203 return r;
1204 }
1205
1206 link->address_label_messages++;
1207 }
1208
1209 /* now that we can figure out a default address for the dhcp server,
1210 start it */
1211 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1212 Address *address;
1213 Link *uplink = NULL;
1214 bool acquired_uplink = false;
1215
1216 address = link_find_dhcp_server_address(link);
1217 if (!address) {
1218 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1219 link_enter_failed(link);
1220 return 0;
1221 }
1222
1223 /* use the server address' subnet as the pool */
1224 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1225 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1226 if (r < 0)
1227 return r;
1228
1229 /* TODO:
1230 r = sd_dhcp_server_set_router(link->dhcp_server,
1231 &main_address->in_addr.in);
1232 if (r < 0)
1233 return r;
1234 */
1235
1236 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1237 r = sd_dhcp_server_set_max_lease_time(
1238 link->dhcp_server,
1239 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1240 if (r < 0)
1241 return r;
1242 }
1243
1244 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1245 r = sd_dhcp_server_set_default_lease_time(
1246 link->dhcp_server,
1247 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1248 if (r < 0)
1249 return r;
1250 }
1251
1252 if (link->network->dhcp_server_emit_dns) {
1253
1254 if (link->network->n_dhcp_server_dns > 0)
1255 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1256 else {
1257 uplink = manager_find_uplink(link->manager, link);
1258 acquired_uplink = true;
1259
1260 if (!uplink) {
1261 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1262 r = 0;
1263 } else
1264 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1265 }
1266 if (r < 0)
1267 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1268 }
1269
1270 if (link->network->dhcp_server_emit_ntp) {
1271
1272 if (link->network->n_dhcp_server_ntp > 0)
1273 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1274 else {
1275 if (!acquired_uplink)
1276 uplink = manager_find_uplink(link->manager, link);
1277
1278 if (!uplink) {
1279 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1280 r = 0;
1281 } else
1282 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1283
1284 }
1285 if (r < 0)
1286 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1287 }
1288
1289 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1290 if (r < 0)
1291 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1292
1293 if (link->network->dhcp_server_emit_timezone) {
1294 _cleanup_free_ char *buffer = NULL;
1295 const char *tz = NULL;
1296
1297 if (link->network->dhcp_server_timezone)
1298 tz = link->network->dhcp_server_timezone;
1299 else {
1300 r = get_timezone(&buffer);
1301 if (r < 0)
1302 log_warning_errno(r, "Failed to determine timezone: %m");
1303 else
1304 tz = buffer;
1305 }
1306
1307 if (tz) {
1308 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1309 if (r < 0)
1310 return r;
1311 }
1312 }
1313 if (!sd_dhcp_server_is_running(link->dhcp_server)) {
1314 r = sd_dhcp_server_start(link->dhcp_server);
1315 if (r < 0) {
1316 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1317
1318 link_enter_failed(link);
1319
1320 return 0;
1321 }
1322 }
1323
1324 log_link_debug(link, "Offering DHCPv4 leases");
1325 }
1326
1327 if (link->address_messages == 0) {
1328 link->addresses_configured = true;
1329 link_check_ready(link);
1330 } else
1331 log_link_debug(link, "Setting addresses");
1332
1333 return 0;
1334 }
1335
1336 static int link_set_bridge_vlan(Link *link) {
1337 int r;
1338
1339 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1340 if (r < 0)
1341 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1342
1343 return r;
1344 }
1345
1346 static int link_set_proxy_arp(Link *link) {
1347 int r;
1348
1349 if (!link_proxy_arp_enabled(link))
1350 return 0;
1351
1352 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1353 if (r < 0)
1354 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1355
1356 return 0;
1357 }
1358
1359 static int link_configure_after_setting_mtu(Link *link);
1360
1361 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1362 int r;
1363
1364 assert(m);
1365 assert(link);
1366 assert(link->ifname);
1367
1368 link->setting_mtu = false;
1369
1370 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1371 return 1;
1372
1373 r = sd_netlink_message_get_errno(m);
1374 if (r < 0) {
1375 log_link_warning_errno(link, r, "Could not set MTU: %m");
1376 return 1;
1377 }
1378
1379 log_link_debug(link, "Setting MTU done.");
1380
1381 if (link->state == LINK_STATE_INITIALIZED)
1382 (void) link_configure_after_setting_mtu(link);
1383
1384 return 1;
1385 }
1386
1387 int link_set_mtu(Link *link, uint32_t mtu) {
1388 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1389 int r;
1390
1391 assert(link);
1392 assert(link->manager);
1393 assert(link->manager->rtnl);
1394
1395 if (mtu == 0 || link->setting_mtu)
1396 return 0;
1397
1398 if (link->mtu == mtu)
1399 return 0;
1400
1401 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1402
1403 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1404 if (r < 0)
1405 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1406
1407 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1408 * for this interface, then disable IPv6 else enable it. */
1409 (void) link_enable_ipv6(link);
1410
1411 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1412 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1413 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1414
1415 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1416 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1417
1418 mtu = IPV6_MIN_MTU;
1419 }
1420
1421 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1422 if (r < 0)
1423 return log_link_error_errno(link, r, "Could not append MTU: %m");
1424
1425 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1426 link_netlink_destroy_callback, link);
1427 if (r < 0)
1428 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1429
1430 link_ref(link);
1431 link->setting_mtu = true;
1432
1433 return 0;
1434 }
1435
1436 static bool link_reduces_vlan_mtu(Link *link) {
1437 /* See netif_reduces_vlan_mtu() in kernel. */
1438 return streq_ptr(link->kind, "macsec");
1439 }
1440
1441 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1442 uint32_t mtu = 0;
1443 NetDev *dev;
1444 Iterator i;
1445
1446 HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1447 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1448 /* See vlan_dev_change_mtu() in kernel. */
1449 mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1450
1451 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1452 /* See macvlan_change_mtu() in kernel. */
1453 mtu = dev->mtu;
1454
1455 return mtu;
1456 }
1457
1458 static int link_configure_mtu(Link *link) {
1459 uint32_t mtu;
1460
1461 assert(link);
1462 assert(link->network);
1463
1464 if (link->network->mtu > 0)
1465 return link_set_mtu(link, link->network->mtu);
1466
1467 mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1468 if (link->mtu >= mtu)
1469 return 0;
1470
1471 log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1472 "If it is not desired, then please explicitly specify MTUBytes= setting.",
1473 link->mtu, mtu);
1474
1475 return link_set_mtu(link, mtu);
1476 }
1477
1478 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1479 int r;
1480
1481 assert(m);
1482 assert(link);
1483 assert(link->ifname);
1484
1485 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1486 return 1;
1487
1488 r = sd_netlink_message_get_errno(m);
1489 if (r < 0)
1490 log_link_warning_errno(link, r, "Could not set link flags: %m");
1491
1492 return 1;
1493 }
1494
1495 static int link_set_flags(Link *link) {
1496 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1497 unsigned ifi_change = 0;
1498 unsigned ifi_flags = 0;
1499 int r;
1500
1501 assert(link);
1502 assert(link->manager);
1503 assert(link->manager->rtnl);
1504
1505 if (link->flags & IFF_LOOPBACK)
1506 return 0;
1507
1508 if (!link->network)
1509 return 0;
1510
1511 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1512 return 0;
1513
1514 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1515 if (r < 0)
1516 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1517
1518 if (link->network->arp >= 0) {
1519 ifi_change |= IFF_NOARP;
1520 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1521 }
1522
1523 if (link->network->multicast >= 0) {
1524 ifi_change |= IFF_MULTICAST;
1525 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1526 }
1527
1528 if (link->network->allmulticast >= 0) {
1529 ifi_change |= IFF_ALLMULTI;
1530 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1531 }
1532
1533 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1534 if (r < 0)
1535 return log_link_error_errno(link, r, "Could not set link flags: %m");
1536
1537 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1538 link_netlink_destroy_callback, link);
1539 if (r < 0)
1540 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1541
1542 link_ref(link);
1543
1544 return 0;
1545 }
1546
1547 static int link_acquire_ipv6_conf(Link *link) {
1548 int r;
1549
1550 assert(link);
1551
1552 if (link_ipv6_accept_ra_enabled(link)) {
1553 assert(link->ndisc);
1554
1555 log_link_debug(link, "Discovering IPv6 routers");
1556
1557 r = sd_ndisc_start(link->ndisc);
1558 if (r < 0 && r != -EBUSY)
1559 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1560 }
1561
1562 if (link_radv_enabled(link)) {
1563 assert(link->radv);
1564 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1565
1566 log_link_debug(link, "Starting IPv6 Router Advertisements");
1567
1568 r = sd_radv_start(link->radv);
1569 if (r < 0 && r != -EBUSY)
1570 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1571 }
1572
1573 (void) dhcp6_request_prefix_delegation(link);
1574
1575 return 0;
1576 }
1577
1578 static int link_acquire_ipv4_conf(Link *link) {
1579 int r;
1580
1581 assert(link);
1582 assert(link->manager);
1583 assert(link->manager->event);
1584
1585 if (link_ipv4ll_enabled(link)) {
1586 assert(link->ipv4ll);
1587
1588 log_link_debug(link, "Acquiring IPv4 link-local address");
1589
1590 r = sd_ipv4ll_start(link->ipv4ll);
1591 if (r < 0)
1592 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1593 }
1594
1595 if (link_dhcp4_enabled(link)) {
1596 assert(link->dhcp_client);
1597
1598 log_link_debug(link, "Acquiring DHCPv4 lease");
1599
1600 r = sd_dhcp_client_start(link->dhcp_client);
1601 if (r < 0)
1602 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1603 }
1604
1605 return 0;
1606 }
1607
1608 static int link_acquire_conf(Link *link) {
1609 int r;
1610
1611 assert(link);
1612
1613 r = link_acquire_ipv4_conf(link);
1614 if (r < 0)
1615 return r;
1616
1617 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1618 r = link_acquire_ipv6_conf(link);
1619 if (r < 0)
1620 return r;
1621 }
1622
1623 if (link_lldp_emit_enabled(link)) {
1624 r = link_lldp_emit_start(link);
1625 if (r < 0)
1626 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1627 }
1628
1629 return 0;
1630 }
1631
1632 bool link_has_carrier(Link *link) {
1633 /* see Documentation/networking/operstates.txt in the kernel sources */
1634
1635 if (link->kernel_operstate == IF_OPER_UP)
1636 return true;
1637
1638 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1639 /* operstate may not be implemented, so fall back to flags */
1640 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1641 !FLAGS_SET(link->flags, IFF_DORMANT))
1642 return true;
1643
1644 return false;
1645 }
1646
1647 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1648 int r;
1649
1650 assert(link);
1651
1652 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1653 return 1;
1654
1655 r = sd_netlink_message_get_errno(m);
1656 if (r < 0)
1657 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1658
1659 return 1;
1660 }
1661
1662 static int link_configure_addrgen_mode(Link *link) {
1663 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1664 uint8_t ipv6ll_mode;
1665 int r;
1666
1667 assert(link);
1668 assert(link->network);
1669 assert(link->manager);
1670 assert(link->manager->rtnl);
1671
1672 if (!socket_ipv6_is_supported())
1673 return 0;
1674
1675 log_link_debug(link, "Setting address genmode for link");
1676
1677 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1678 if (r < 0)
1679 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1680
1681 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1682 if (r < 0)
1683 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1684
1685 r = sd_netlink_message_open_container(req, AF_INET6);
1686 if (r < 0)
1687 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1688
1689 if (!link_ipv6ll_enabled(link))
1690 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1691 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1692 /* The file may not exist. And event if it exists, when stable_secret is unset,
1693 * reading the file fails with EIO. */
1694 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1695 else
1696 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1697
1698 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1699 if (r < 0)
1700 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1701
1702 r = sd_netlink_message_close_container(req);
1703 if (r < 0)
1704 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1705
1706 r = sd_netlink_message_close_container(req);
1707 if (r < 0)
1708 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1709
1710 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1711 link_netlink_destroy_callback, link);
1712 if (r < 0)
1713 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1714
1715 link_ref(link);
1716
1717 return 0;
1718 }
1719
1720 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1721 int r;
1722
1723 assert(link);
1724
1725 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1726 return 1;
1727
1728 r = sd_netlink_message_get_errno(m);
1729 if (r < 0)
1730 /* we warn but don't fail the link, as it may be brought up later */
1731 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1732
1733 return 1;
1734 }
1735
1736 static int link_up(Link *link) {
1737 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1738 int r;
1739
1740 assert(link);
1741 assert(link->network);
1742 assert(link->manager);
1743 assert(link->manager->rtnl);
1744
1745 log_link_debug(link, "Bringing link up");
1746
1747 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1748 if (r < 0)
1749 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1750
1751 /* set it free if not enslaved with networkd */
1752 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1753 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1754 if (r < 0)
1755 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1756 }
1757
1758 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1759 if (r < 0)
1760 return log_link_error_errno(link, r, "Could not set link flags: %m");
1761
1762 if (link->network->mac) {
1763 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1764 if (r < 0)
1765 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1766 }
1767
1768 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1769 link_netlink_destroy_callback, link);
1770 if (r < 0)
1771 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1772
1773 link_ref(link);
1774
1775 return 0;
1776 }
1777
1778 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1779 int r;
1780
1781 assert(link);
1782
1783 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1784 return 1;
1785
1786 r = sd_netlink_message_get_errno(m);
1787 if (r < 0)
1788 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1789
1790 return 1;
1791 }
1792
1793 int link_down(Link *link, link_netlink_message_handler_t callback) {
1794 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1795 int r;
1796
1797 assert(link);
1798 assert(link->manager);
1799 assert(link->manager->rtnl);
1800
1801 log_link_debug(link, "Bringing link down");
1802
1803 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1804 RTM_SETLINK, link->ifindex);
1805 if (r < 0)
1806 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1807
1808 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1809 if (r < 0)
1810 return log_link_error_errno(link, r, "Could not set link flags: %m");
1811
1812 r = netlink_call_async(link->manager->rtnl, NULL, req,
1813 callback ?: link_down_handler,
1814 link_netlink_destroy_callback, link);
1815 if (r < 0)
1816 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1817
1818 link_ref(link);
1819
1820 return 0;
1821 }
1822
1823 static int link_handle_bound_to_list(Link *link) {
1824 Link *l;
1825 Iterator i;
1826 int r;
1827 bool required_up = false;
1828 bool link_is_up = false;
1829
1830 assert(link);
1831
1832 if (hashmap_isempty(link->bound_to_links))
1833 return 0;
1834
1835 if (link->flags & IFF_UP)
1836 link_is_up = true;
1837
1838 HASHMAP_FOREACH (l, link->bound_to_links, i)
1839 if (link_has_carrier(l)) {
1840 required_up = true;
1841 break;
1842 }
1843
1844 if (!required_up && link_is_up) {
1845 r = link_down(link, NULL);
1846 if (r < 0)
1847 return r;
1848 } else if (required_up && !link_is_up) {
1849 r = link_up(link);
1850 if (r < 0)
1851 return r;
1852 }
1853
1854 return 0;
1855 }
1856
1857 static int link_handle_bound_by_list(Link *link) {
1858 Iterator i;
1859 Link *l;
1860 int r;
1861
1862 assert(link);
1863
1864 if (hashmap_isempty(link->bound_by_links))
1865 return 0;
1866
1867 HASHMAP_FOREACH (l, link->bound_by_links, i) {
1868 r = link_handle_bound_to_list(l);
1869 if (r < 0)
1870 return r;
1871 }
1872
1873 return 0;
1874 }
1875
1876 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1877 int r;
1878
1879 assert(link);
1880 assert(carrier);
1881
1882 if (link == carrier)
1883 return 0;
1884
1885 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1886 return 0;
1887
1888 r = hashmap_ensure_allocated(h, NULL);
1889 if (r < 0)
1890 return r;
1891
1892 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1893 if (r < 0)
1894 return r;
1895
1896 return 0;
1897 }
1898
1899 static int link_new_bound_by_list(Link *link) {
1900 Manager *m;
1901 Link *carrier;
1902 Iterator i;
1903 int r;
1904 bool list_updated = false;
1905
1906 assert(link);
1907 assert(link->manager);
1908
1909 m = link->manager;
1910
1911 HASHMAP_FOREACH(carrier, m->links, i) {
1912 if (!carrier->network)
1913 continue;
1914
1915 if (strv_isempty(carrier->network->bind_carrier))
1916 continue;
1917
1918 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
1919 r = link_put_carrier(link, carrier, &link->bound_by_links);
1920 if (r < 0)
1921 return r;
1922
1923 list_updated = true;
1924 }
1925 }
1926
1927 if (list_updated)
1928 link_dirty(link);
1929
1930 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
1931 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1932 if (r < 0)
1933 return r;
1934
1935 link_dirty(carrier);
1936 }
1937
1938 return 0;
1939 }
1940
1941 static int link_new_bound_to_list(Link *link) {
1942 Manager *m;
1943 Link *carrier;
1944 Iterator i;
1945 int r;
1946 bool list_updated = false;
1947
1948 assert(link);
1949 assert(link->manager);
1950
1951 if (!link->network)
1952 return 0;
1953
1954 if (strv_isempty(link->network->bind_carrier))
1955 return 0;
1956
1957 m = link->manager;
1958
1959 HASHMAP_FOREACH (carrier, m->links, i) {
1960 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
1961 r = link_put_carrier(link, carrier, &link->bound_to_links);
1962 if (r < 0)
1963 return r;
1964
1965 list_updated = true;
1966 }
1967 }
1968
1969 if (list_updated)
1970 link_dirty(link);
1971
1972 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
1973 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
1974 if (r < 0)
1975 return r;
1976
1977 link_dirty(carrier);
1978 }
1979
1980 return 0;
1981 }
1982
1983 static int link_new_carrier_maps(Link *link) {
1984 int r;
1985
1986 r = link_new_bound_by_list(link);
1987 if (r < 0)
1988 return r;
1989
1990 r = link_handle_bound_by_list(link);
1991 if (r < 0)
1992 return r;
1993
1994 r = link_new_bound_to_list(link);
1995 if (r < 0)
1996 return r;
1997
1998 r = link_handle_bound_to_list(link);
1999 if (r < 0)
2000 return r;
2001
2002 return 0;
2003 }
2004
2005 static void link_free_bound_to_list(Link *link) {
2006 Link *bound_to;
2007 Iterator i;
2008
2009 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2010 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2011
2012 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2013 link_dirty(bound_to);
2014 }
2015
2016 return;
2017 }
2018
2019 static void link_free_bound_by_list(Link *link) {
2020 Link *bound_by;
2021 Iterator i;
2022
2023 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2024 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2025
2026 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2027 link_dirty(bound_by);
2028 link_handle_bound_to_list(bound_by);
2029 }
2030 }
2031
2032 return;
2033 }
2034
2035 static void link_free_carrier_maps(Link *link) {
2036 bool list_updated = false;
2037
2038 assert(link);
2039
2040 if (!hashmap_isempty(link->bound_to_links)) {
2041 link_free_bound_to_list(link);
2042 list_updated = true;
2043 }
2044
2045 if (!hashmap_isempty(link->bound_by_links)) {
2046 link_free_bound_by_list(link);
2047 list_updated = true;
2048 }
2049
2050 if (list_updated)
2051 link_dirty(link);
2052
2053 return;
2054 }
2055
2056 static int link_append_to_master(Link *link, NetDev *netdev) {
2057 Link *master;
2058 int r;
2059
2060 assert(link);
2061 assert(netdev);
2062
2063 r = link_get(link->manager, netdev->ifindex, &master);
2064 if (r < 0)
2065 return r;
2066
2067 r = set_ensure_allocated(&master->slaves, NULL);
2068 if (r < 0)
2069 return r;
2070
2071 r = set_put(master->slaves, link);
2072 if (r < 0)
2073 return r;
2074
2075 link_ref(link);
2076 return 0;
2077 }
2078
2079 static void link_drop_from_master(Link *link, NetDev *netdev) {
2080 Link *master;
2081
2082 assert(link);
2083
2084 if (!link->manager || !netdev)
2085 return;
2086
2087 if (link_get(link->manager, netdev->ifindex, &master) < 0)
2088 return;
2089
2090 link_unref(set_remove(master->slaves, link));
2091 }
2092
2093 static void link_detach_from_manager(Link *link) {
2094 if (!link || !link->manager)
2095 return;
2096
2097 link_unref(set_remove(link->manager->links_requesting_uuid, link));
2098 link_clean(link);
2099
2100 /* The following must be called at last. */
2101 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2102 link_unref(link);
2103 }
2104
2105 void link_drop(Link *link) {
2106 if (!link || link->state == LINK_STATE_LINGER)
2107 return;
2108
2109 link_set_state(link, LINK_STATE_LINGER);
2110
2111 link_free_carrier_maps(link);
2112
2113 if (link->network) {
2114 link_drop_from_master(link, link->network->bridge);
2115 link_drop_from_master(link, link->network->bond);
2116 }
2117
2118 log_link_debug(link, "Link removed");
2119
2120 (void) unlink(link->state_file);
2121 link_detach_from_manager(link);
2122 }
2123
2124 static int link_joined(Link *link) {
2125 int r;
2126
2127 assert(link);
2128 assert(link->network);
2129
2130 if (!hashmap_isempty(link->bound_to_links)) {
2131 r = link_handle_bound_to_list(link);
2132 if (r < 0)
2133 return r;
2134 } else if (!(link->flags & IFF_UP)) {
2135 r = link_up(link);
2136 if (r < 0) {
2137 link_enter_failed(link);
2138 return r;
2139 }
2140 }
2141
2142 if (link->network->bridge) {
2143 r = link_set_bridge(link);
2144 if (r < 0)
2145 log_link_error_errno(link, r, "Could not set bridge message: %m");
2146
2147 r = link_append_to_master(link, link->network->bridge);
2148 if (r < 0)
2149 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2150 }
2151
2152 if (link->network->bond) {
2153 r = link_set_bond(link);
2154 if (r < 0)
2155 log_link_error_errno(link, r, "Could not set bond message: %m");
2156
2157 r = link_append_to_master(link, link->network->bond);
2158 if (r < 0)
2159 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2160 }
2161
2162 if (link->network->use_br_vlan &&
2163 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2164 r = link_set_bridge_vlan(link);
2165 if (r < 0)
2166 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2167 }
2168
2169 /* Skip setting up addresses until it gets carrier,
2170 or it would try to set addresses twice,
2171 which is bad for non-idempotent steps. */
2172 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2173 return 0;
2174
2175 return link_request_set_addresses(link);
2176 }
2177
2178 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2179 int r;
2180
2181 assert(link);
2182 assert(link->network);
2183 assert(link->enslaving > 0);
2184 assert(!link->enslaved_raw);
2185
2186 link->enslaving--;
2187
2188 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2189 return 1;
2190
2191 r = sd_netlink_message_get_errno(m);
2192 if (r < 0 && r != -EEXIST) {
2193 log_link_error_errno(link, r, "Could not join netdev: %m");
2194 link_enter_failed(link);
2195 return 1;
2196 } else
2197 log_link_debug(link, "Joined netdev");
2198
2199 if (link->enslaving == 0) {
2200 link->enslaved_raw = true;
2201 link_joined(link);
2202 }
2203
2204 return 1;
2205 }
2206
2207 static int link_enter_join_netdev(Link *link) {
2208 NetDev *netdev;
2209 Iterator i;
2210 int r;
2211
2212 assert(link);
2213 assert(link->network);
2214 assert(link->state == LINK_STATE_INITIALIZED);
2215
2216 link_set_state(link, LINK_STATE_CONFIGURING);
2217
2218 link_dirty(link);
2219 link->enslaving = 0;
2220 link->enslaved_raw = false;
2221
2222 if (link->network->bond) {
2223 if (link->network->bond->state == NETDEV_STATE_READY &&
2224 link->network->bond->ifindex == link->master_ifindex)
2225 return link_joined(link);
2226
2227 log_struct(LOG_DEBUG,
2228 LOG_LINK_INTERFACE(link),
2229 LOG_NETDEV_INTERFACE(link->network->bond),
2230 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2231
2232 link->enslaving++;
2233
2234 r = netdev_join(link->network->bond, link, netdev_join_handler);
2235 if (r < 0) {
2236 log_struct_errno(LOG_WARNING, r,
2237 LOG_LINK_INTERFACE(link),
2238 LOG_NETDEV_INTERFACE(link->network->bond),
2239 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2240 link_enter_failed(link);
2241 return r;
2242 }
2243 }
2244
2245 if (link->network->bridge) {
2246 log_struct(LOG_DEBUG,
2247 LOG_LINK_INTERFACE(link),
2248 LOG_NETDEV_INTERFACE(link->network->bridge),
2249 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2250
2251 link->enslaving++;
2252
2253 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2254 if (r < 0) {
2255 log_struct_errno(LOG_WARNING, r,
2256 LOG_LINK_INTERFACE(link),
2257 LOG_NETDEV_INTERFACE(link->network->bridge),
2258 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2259 link_enter_failed(link);
2260 return r;
2261 }
2262 }
2263
2264 if (link->network->vrf) {
2265 log_struct(LOG_DEBUG,
2266 LOG_LINK_INTERFACE(link),
2267 LOG_NETDEV_INTERFACE(link->network->vrf),
2268 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2269
2270 link->enslaving++;
2271
2272 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2273 if (r < 0) {
2274 log_struct_errno(LOG_WARNING, r,
2275 LOG_LINK_INTERFACE(link),
2276 LOG_NETDEV_INTERFACE(link->network->vrf),
2277 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2278 link_enter_failed(link);
2279 return r;
2280 }
2281 }
2282
2283 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2284
2285 if (netdev->ifindex > 0)
2286 /* Assume already enslaved. */
2287 continue;
2288
2289 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2290 continue;
2291
2292 log_struct(LOG_DEBUG,
2293 LOG_LINK_INTERFACE(link),
2294 LOG_NETDEV_INTERFACE(netdev),
2295 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2296
2297 link->enslaving++;
2298
2299 r = netdev_join(netdev, link, netdev_join_handler);
2300 if (r < 0) {
2301 log_struct_errno(LOG_WARNING, r,
2302 LOG_LINK_INTERFACE(link),
2303 LOG_NETDEV_INTERFACE(netdev),
2304 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2305 link_enter_failed(link);
2306 return r;
2307 }
2308 }
2309
2310 if (link->enslaving == 0)
2311 return link_joined(link);
2312
2313 return 0;
2314 }
2315
2316 static int link_set_ipv4_forward(Link *link) {
2317 int r;
2318
2319 if (!link_ipv4_forward_enabled(link))
2320 return 0;
2321
2322 /* We propagate the forwarding flag from one interface to the
2323 * global setting one way. This means: as long as at least one
2324 * interface was configured at any time that had IP forwarding
2325 * enabled the setting will stay on for good. We do this
2326 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2327 * somewhat in sync (see below). */
2328
2329 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2330 if (r < 0)
2331 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2332
2333 return 0;
2334 }
2335
2336 static int link_set_ipv6_forward(Link *link) {
2337 int r;
2338
2339 if (!link_ipv6_forward_enabled(link))
2340 return 0;
2341
2342 /* On Linux, the IPv6 stack does not know a per-interface
2343 * packet forwarding setting: either packet forwarding is on
2344 * for all, or off for all. We hence don't bother with a
2345 * per-interface setting, but simply propagate the interface
2346 * flag, if it is set, to the global flag, one-way. Note that
2347 * while IPv4 would allow a per-interface flag, we expose the
2348 * same behaviour there and also propagate the setting from
2349 * one to all, to keep things simple (see above). */
2350
2351 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2352 if (r < 0)
2353 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2354
2355 return 0;
2356 }
2357
2358 static int link_set_ipv6_privacy_extensions(Link *link) {
2359 IPv6PrivacyExtensions s;
2360 int r;
2361
2362 s = link_ipv6_privacy_extensions(link);
2363 if (s < 0)
2364 return 0;
2365
2366 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2367 if (r < 0)
2368 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2369
2370 return 0;
2371 }
2372
2373 static int link_set_ipv6_accept_ra(Link *link) {
2374 int r;
2375
2376 /* Make this a NOP if IPv6 is not available */
2377 if (!socket_ipv6_is_supported())
2378 return 0;
2379
2380 if (link->flags & IFF_LOOPBACK)
2381 return 0;
2382
2383 if (!link->network)
2384 return 0;
2385
2386 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2387 if (r < 0)
2388 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2389
2390 return 0;
2391 }
2392
2393 static int link_set_ipv6_dad_transmits(Link *link) {
2394 int r;
2395
2396 /* Make this a NOP if IPv6 is not available */
2397 if (!socket_ipv6_is_supported())
2398 return 0;
2399
2400 if (link->flags & IFF_LOOPBACK)
2401 return 0;
2402
2403 if (!link->network)
2404 return 0;
2405
2406 if (link->network->ipv6_dad_transmits < 0)
2407 return 0;
2408
2409 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2410 if (r < 0)
2411 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2412
2413 return 0;
2414 }
2415
2416 static int link_set_ipv6_hop_limit(Link *link) {
2417 int r;
2418
2419 /* Make this a NOP if IPv6 is not available */
2420 if (!socket_ipv6_is_supported())
2421 return 0;
2422
2423 if (link->flags & IFF_LOOPBACK)
2424 return 0;
2425
2426 if (!link->network)
2427 return 0;
2428
2429 if (link->network->ipv6_hop_limit < 0)
2430 return 0;
2431
2432 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2433 if (r < 0)
2434 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2435
2436 return 0;
2437 }
2438
2439 static int link_set_ipv6_mtu(Link *link) {
2440 int r;
2441
2442 /* Make this a NOP if IPv6 is not available */
2443 if (!socket_ipv6_is_supported())
2444 return 0;
2445
2446 if (link->flags & IFF_LOOPBACK)
2447 return 0;
2448
2449 if (link->network->ipv6_mtu == 0)
2450 return 0;
2451
2452 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2453 if (r < 0)
2454 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2455
2456 return 0;
2457 }
2458
2459 static bool link_is_static_address_configured(Link *link, Address *address) {
2460 Address *net_address;
2461
2462 assert(link);
2463 assert(address);
2464
2465 if (!link->network)
2466 return false;
2467
2468 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2469 if (address_equal(net_address, address))
2470 return true;
2471
2472 return false;
2473 }
2474
2475 static bool link_is_static_route_configured(Link *link, Route *route) {
2476 Route *net_route;
2477
2478 assert(link);
2479 assert(route);
2480
2481 if (!link->network)
2482 return false;
2483
2484 LIST_FOREACH(routes, net_route, link->network->static_routes)
2485 if (route_equal(net_route, route))
2486 return true;
2487
2488 return false;
2489 }
2490
2491 static int link_drop_foreign_config(Link *link) {
2492 Address *address;
2493 Route *route;
2494 Iterator i;
2495 int r;
2496
2497 SET_FOREACH(address, link->addresses_foreign, i) {
2498 /* we consider IPv6LL addresses to be managed by the kernel */
2499 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2500 continue;
2501
2502 if (link_is_static_address_configured(link, address)) {
2503 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2504 if (r < 0)
2505 return log_link_error_errno(link, r, "Failed to add address: %m");
2506 } else {
2507 r = address_remove(address, link, NULL);
2508 if (r < 0)
2509 return r;
2510 }
2511 }
2512
2513 SET_FOREACH(route, link->routes_foreign, i) {
2514 /* do not touch routes managed by the kernel */
2515 if (route->protocol == RTPROT_KERNEL)
2516 continue;
2517
2518 if (link_is_static_route_configured(link, route)) {
2519 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2520 if (r < 0)
2521 return r;
2522 } else {
2523 r = route_remove(route, link, NULL);
2524 if (r < 0)
2525 return r;
2526 }
2527 }
2528
2529 return 0;
2530 }
2531
2532 static int link_drop_config(Link *link) {
2533 Address *address, *pool_address;
2534 Route *route;
2535 Iterator i;
2536 int r;
2537
2538 SET_FOREACH(address, link->addresses, i) {
2539 /* we consider IPv6LL addresses to be managed by the kernel */
2540 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2541 continue;
2542
2543 r = address_remove(address, link, NULL);
2544 if (r < 0)
2545 return r;
2546
2547 /* If this address came from an address pool, clean up the pool */
2548 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2549 if (address_equal(address, pool_address)) {
2550 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2551 address_free(pool_address);
2552 break;
2553 }
2554 }
2555 }
2556
2557 SET_FOREACH(route, link->routes, i) {
2558 /* do not touch routes managed by the kernel */
2559 if (route->protocol == RTPROT_KERNEL)
2560 continue;
2561
2562 r = route_remove(route, link, NULL);
2563 if (r < 0)
2564 return r;
2565 }
2566
2567 ndisc_flush(link);
2568
2569 return 0;
2570 }
2571
2572 static int link_configure(Link *link) {
2573 int r;
2574
2575 assert(link);
2576 assert(link->network);
2577 assert(link->state == LINK_STATE_INITIALIZED);
2578
2579 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
2580 return link_configure_can(link);
2581
2582 /* Drop foreign config, but ignore loopback or critical devices.
2583 * We do not want to remove loopback address or addresses used for root NFS. */
2584 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2585 r = link_drop_foreign_config(link);
2586 if (r < 0)
2587 return r;
2588 }
2589
2590 r = link_set_proxy_arp(link);
2591 if (r < 0)
2592 return r;
2593
2594 r = ipv6_proxy_ndp_addresses_configure(link);
2595 if (r < 0)
2596 return r;
2597
2598 r = link_set_ipv4_forward(link);
2599 if (r < 0)
2600 return r;
2601
2602 r = link_set_ipv6_forward(link);
2603 if (r < 0)
2604 return r;
2605
2606 r = link_set_ipv6_privacy_extensions(link);
2607 if (r < 0)
2608 return r;
2609
2610 r = link_set_ipv6_accept_ra(link);
2611 if (r < 0)
2612 return r;
2613
2614 r = link_set_ipv6_dad_transmits(link);
2615 if (r < 0)
2616 return r;
2617
2618 r = link_set_ipv6_hop_limit(link);
2619 if (r < 0)
2620 return r;
2621
2622 r = link_set_flags(link);
2623 if (r < 0)
2624 return r;
2625
2626 r = link_set_ipv6_mtu(link);
2627 if (r < 0)
2628 return r;
2629
2630 if (link_ipv4ll_enabled(link) || link_ipv4ll_fallback_enabled(link)) {
2631 r = ipv4ll_configure(link);
2632 if (r < 0)
2633 return r;
2634 }
2635
2636 if (link_dhcp4_enabled(link)) {
2637 r = dhcp4_set_promote_secondaries(link);
2638 if (r < 0)
2639 return r;
2640
2641 r = dhcp4_configure(link);
2642 if (r < 0)
2643 return r;
2644 }
2645
2646 if (link_dhcp4_server_enabled(link)) {
2647 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2648 if (r < 0)
2649 return r;
2650
2651 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2652 if (r < 0)
2653 return r;
2654 }
2655
2656 if (link_dhcp6_enabled(link) ||
2657 link_ipv6_accept_ra_enabled(link)) {
2658 r = dhcp6_configure(link);
2659 if (r < 0)
2660 return r;
2661 }
2662
2663 if (link_ipv6_accept_ra_enabled(link)) {
2664 r = ndisc_configure(link);
2665 if (r < 0)
2666 return r;
2667 }
2668
2669 if (link_radv_enabled(link)) {
2670 r = radv_configure(link);
2671 if (r < 0)
2672 return r;
2673 }
2674
2675 if (link_lldp_rx_enabled(link)) {
2676 r = link_lldp_rx_configure(link);
2677 if (r < 0)
2678 return r;
2679 }
2680
2681 r = link_configure_mtu(link);
2682 if (r < 0)
2683 return r;
2684
2685 r = link_configure_addrgen_mode(link);
2686 if (r < 0)
2687 return r;
2688
2689 return link_configure_after_setting_mtu(link);
2690 }
2691
2692 static int link_configure_after_setting_mtu(Link *link) {
2693 int r;
2694
2695 assert(link);
2696 assert(link->network);
2697 assert(link->state == LINK_STATE_INITIALIZED);
2698
2699 if (link->setting_mtu)
2700 return 0;
2701
2702 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2703 r = link_acquire_conf(link);
2704 if (r < 0)
2705 return r;
2706 }
2707
2708 return link_enter_join_netdev(link);
2709 }
2710
2711 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
2712 assert(duid);
2713
2714 if (duid->raw_data_len > 0)
2715 return 0;
2716
2717 if (duid->type != DUID_TYPE_UUID)
2718 return -EINVAL;
2719
2720 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
2721 duid->raw_data_len = sizeof(sd_id128_t);
2722
2723 return 1;
2724 }
2725
2726 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
2727 Manager *manager = userdata;
2728 const sd_bus_error *e;
2729 const void *a;
2730 size_t sz;
2731 DUID *duid;
2732 Link *link;
2733 int r;
2734
2735 assert(m);
2736 assert(manager);
2737
2738 e = sd_bus_message_get_error(m);
2739 if (e) {
2740 log_error_errno(sd_bus_error_get_errno(e),
2741 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
2742 e->message);
2743 goto configure;
2744 }
2745
2746 r = sd_bus_message_read_array(m, 'y', &a, &sz);
2747 if (r < 0)
2748 goto configure;
2749
2750 if (sz != sizeof(sd_id128_t)) {
2751 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
2752 goto configure;
2753 }
2754
2755 memcpy(&manager->product_uuid, a, sz);
2756 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
2757 (void) duid_set_uuid(duid, manager->product_uuid);
2758
2759 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
2760
2761 configure:
2762 while ((link = set_steal_first(manager->links_requesting_uuid))) {
2763 r = link_configure(link);
2764 if (r < 0)
2765 log_link_error_errno(link, r, "Failed to configure link: %m");
2766 }
2767
2768 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
2769
2770 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
2771 * even if the method fails. */
2772 manager->has_product_uuid = true;
2773
2774 return 1;
2775 }
2776
2777 static bool link_requires_uuid(Link *link) {
2778 const DUID *duid;
2779
2780 assert(link);
2781 assert(link->manager);
2782 assert(link->network);
2783
2784 duid = link_get_duid(link);
2785 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
2786 return false;
2787
2788 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
2789 return true;
2790
2791 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
2792 return true;
2793
2794 return false;
2795 }
2796
2797 static int link_configure_duid(Link *link) {
2798 Manager *m;
2799 DUID *duid;
2800 int r;
2801
2802 assert(link);
2803 assert(link->manager);
2804 assert(link->network);
2805
2806 m = link->manager;
2807 duid = link_get_duid(link);
2808
2809 if (!link_requires_uuid(link))
2810 return 1;
2811
2812 if (m->has_product_uuid) {
2813 (void) duid_set_uuid(duid, m->product_uuid);
2814 return 1;
2815 }
2816
2817 if (!m->links_requesting_uuid) {
2818 r = manager_request_product_uuid(m, link);
2819 if (r < 0) {
2820 if (r == -ENOMEM)
2821 return r;
2822
2823 log_link_warning_errno(link, r,
2824 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
2825 return 1;
2826 }
2827 } else {
2828 r = set_put(m->links_requesting_uuid, link);
2829 if (r < 0)
2830 return log_oom();
2831
2832 r = set_put(m->duids_requesting_uuid, duid);
2833 if (r < 0)
2834 return log_oom();
2835 }
2836
2837 return 0;
2838 }
2839
2840 static int link_initialized_and_synced(Link *link) {
2841 Network *network;
2842 int r;
2843
2844 assert(link);
2845 assert(link->ifname);
2846 assert(link->manager);
2847
2848 /* We may get called either from the asynchronous netlink callback,
2849 * or directly for link_add() if running in a container. See link_add(). */
2850 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
2851 return 0;
2852
2853 log_link_debug(link, "Link state is up-to-date");
2854 link_set_state(link, LINK_STATE_INITIALIZED);
2855
2856 r = link_new_bound_by_list(link);
2857 if (r < 0)
2858 return r;
2859
2860 r = link_handle_bound_by_list(link);
2861 if (r < 0)
2862 return r;
2863
2864 if (!link->network) {
2865 r = network_get(link->manager, link->sd_device, link->ifname,
2866 &link->mac, &network);
2867 if (r == -ENOENT) {
2868 link_enter_unmanaged(link);
2869 return 0;
2870 } else if (r == 0 && network->unmanaged) {
2871 link_enter_unmanaged(link);
2872 return 0;
2873 } else if (r < 0)
2874 return r;
2875
2876 if (link->flags & IFF_LOOPBACK) {
2877 if (network->link_local != ADDRESS_FAMILY_NO)
2878 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2879
2880 if (network->dhcp != ADDRESS_FAMILY_NO)
2881 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2882
2883 if (network->dhcp_server)
2884 log_link_debug(link, "Ignoring DHCP server for loopback link");
2885 }
2886
2887 r = network_apply(network, link);
2888 if (r < 0)
2889 return r;
2890 }
2891
2892 r = link_new_bound_to_list(link);
2893 if (r < 0)
2894 return r;
2895
2896 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
2897 * link_configure() is called later asynchronously. */
2898 r = link_configure_duid(link);
2899 if (r <= 0)
2900 return r;
2901
2902 r = link_configure(link);
2903 if (r < 0)
2904 return r;
2905
2906 return 0;
2907 }
2908
2909 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2910 (void) link_initialized_and_synced(link);
2911 return 1;
2912 }
2913
2914 int link_initialized(Link *link, sd_device *device) {
2915 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2916 int r;
2917
2918 assert(link);
2919 assert(link->manager);
2920 assert(link->manager->rtnl);
2921 assert(device);
2922
2923 if (link->state != LINK_STATE_PENDING)
2924 return 0;
2925
2926 if (link->sd_device)
2927 return 0;
2928
2929 log_link_debug(link, "udev initialized link");
2930 link_set_state(link, LINK_STATE_INITIALIZED);
2931
2932 link->sd_device = sd_device_ref(device);
2933
2934 /* udev has initialized the link, but we don't know if we have yet
2935 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2936 * when it returns we know that the pending NEWLINKs have already been
2937 * processed and that we are up-to-date */
2938
2939 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2940 link->ifindex);
2941 if (r < 0)
2942 return r;
2943
2944 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
2945 link_netlink_destroy_callback, link);
2946 if (r < 0)
2947 return r;
2948
2949 link_ref(link);
2950
2951 return 0;
2952 }
2953
2954 static int link_load(Link *link) {
2955 _cleanup_free_ char *network_file = NULL,
2956 *addresses = NULL,
2957 *routes = NULL,
2958 *dhcp4_address = NULL,
2959 *ipv4ll_address = NULL;
2960 union in_addr_union address;
2961 union in_addr_union route_dst;
2962 const char *p;
2963 int r;
2964
2965 assert(link);
2966
2967 r = parse_env_file(NULL, link->state_file,
2968 "NETWORK_FILE", &network_file,
2969 "ADDRESSES", &addresses,
2970 "ROUTES", &routes,
2971 "DHCP4_ADDRESS", &dhcp4_address,
2972 "IPV4LL_ADDRESS", &ipv4ll_address);
2973 if (r < 0 && r != -ENOENT)
2974 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
2975
2976 if (network_file) {
2977 Network *network;
2978 char *suffix;
2979
2980 /* drop suffix */
2981 suffix = strrchr(network_file, '.');
2982 if (!suffix) {
2983 log_link_debug(link, "Failed to get network name from %s", network_file);
2984 goto network_file_fail;
2985 }
2986 *suffix = '\0';
2987
2988 r = network_get_by_name(link->manager, basename(network_file), &network);
2989 if (r < 0) {
2990 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
2991 goto network_file_fail;
2992 }
2993
2994 r = network_apply(network, link);
2995 if (r < 0)
2996 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
2997 }
2998
2999 network_file_fail:
3000
3001 if (addresses) {
3002 p = addresses;
3003
3004 for (;;) {
3005 _cleanup_free_ char *address_str = NULL;
3006 char *prefixlen_str;
3007 int family;
3008 unsigned char prefixlen;
3009
3010 r = extract_first_word(&p, &address_str, NULL, 0);
3011 if (r < 0) {
3012 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3013 continue;
3014 }
3015 if (r == 0)
3016 break;
3017
3018 prefixlen_str = strchr(address_str, '/');
3019 if (!prefixlen_str) {
3020 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3021 continue;
3022 }
3023
3024 *prefixlen_str++ = '\0';
3025
3026 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3027 if (r != 1) {
3028 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3029 continue;
3030 }
3031
3032 r = in_addr_from_string_auto(address_str, &family, &address);
3033 if (r < 0) {
3034 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3035 continue;
3036 }
3037
3038 r = address_add(link, family, &address, prefixlen, NULL);
3039 if (r < 0)
3040 return log_link_error_errno(link, r, "Failed to add address: %m");
3041 }
3042 }
3043
3044 if (routes) {
3045 p = routes;
3046
3047 for (;;) {
3048 Route *route;
3049 _cleanup_free_ char *route_str = NULL;
3050 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3051 usec_t lifetime;
3052 char *prefixlen_str;
3053 int family;
3054 unsigned char prefixlen, tos, table;
3055 uint32_t priority;
3056
3057 r = extract_first_word(&p, &route_str, NULL, 0);
3058 if (r < 0) {
3059 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3060 continue;
3061 }
3062 if (r == 0)
3063 break;
3064
3065 prefixlen_str = strchr(route_str, '/');
3066 if (!prefixlen_str) {
3067 log_link_debug(link, "Failed to parse route %s", route_str);
3068 continue;
3069 }
3070
3071 *prefixlen_str++ = '\0';
3072
3073 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3074 if (r != 5) {
3075 log_link_debug(link,
3076 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3077 prefixlen_str);
3078 continue;
3079 }
3080
3081 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3082 if (r < 0) {
3083 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3084 continue;
3085 }
3086
3087 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3088 if (r < 0)
3089 return log_link_error_errno(link, r, "Failed to add route: %m");
3090
3091 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3092 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3093 0, route_expire_handler, route);
3094 if (r < 0)
3095 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3096 }
3097
3098 route->lifetime = lifetime;
3099 sd_event_source_unref(route->expire);
3100 route->expire = TAKE_PTR(expire);
3101 }
3102 }
3103
3104 if (dhcp4_address) {
3105 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3106 if (r < 0) {
3107 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3108 goto dhcp4_address_fail;
3109 }
3110
3111 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3112 if (r < 0)
3113 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3114
3115 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3116 if (r < 0)
3117 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3118 }
3119
3120 dhcp4_address_fail:
3121
3122 if (ipv4ll_address) {
3123 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3124 if (r < 0) {
3125 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3126 goto ipv4ll_address_fail;
3127 }
3128
3129 r = sd_ipv4ll_new(&link->ipv4ll);
3130 if (r < 0)
3131 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3132
3133 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3134 if (r < 0)
3135 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3136 }
3137
3138 ipv4ll_address_fail:
3139
3140 return 0;
3141 }
3142
3143 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3144 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3145 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3146 Link *link;
3147 int r;
3148
3149 assert(m);
3150 assert(m->rtnl);
3151 assert(message);
3152 assert(ret);
3153
3154 r = link_new(m, message, ret);
3155 if (r < 0)
3156 return r;
3157
3158 link = *ret;
3159
3160 log_link_debug(link, "Link %d added", link->ifindex);
3161
3162 r = link_load(link);
3163 if (r < 0)
3164 return r;
3165
3166 if (detect_container() <= 0) {
3167 /* not in a container, udev will be around */
3168 sprintf(ifindex_str, "n%d", link->ifindex);
3169 r = sd_device_new_from_device_id(&device, ifindex_str);
3170 if (r < 0) {
3171 log_link_warning_errno(link, r, "Could not find device: %m");
3172 goto failed;
3173 }
3174
3175 r = sd_device_get_is_initialized(device);
3176 if (r < 0) {
3177 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3178 goto failed;
3179 }
3180 if (r == 0) {
3181 /* not yet ready */
3182 log_link_debug(link, "link pending udev initialization...");
3183 return 0;
3184 }
3185
3186 r = device_is_renaming(device);
3187 if (r < 0) {
3188 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3189 goto failed;
3190 }
3191 if (r > 0) {
3192 log_link_debug(link, "Interface is under renaming, pending initialization.");
3193 return 0;
3194 }
3195
3196 r = link_initialized(link, device);
3197 if (r < 0)
3198 goto failed;
3199 } else {
3200 r = link_initialized_and_synced(link);
3201 if (r < 0)
3202 goto failed;
3203 }
3204
3205 return 0;
3206 failed:
3207 link_enter_failed(link);
3208 return r;
3209 }
3210
3211 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3212 int r;
3213
3214 assert(link);
3215
3216 log_link_info(link, "Gained IPv6LL");
3217
3218 link->ipv6ll_address = *address;
3219 link_check_ready(link);
3220
3221 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3222 r = link_acquire_ipv6_conf(link);
3223 if (r < 0) {
3224 link_enter_failed(link);
3225 return r;
3226 }
3227 }
3228
3229 return 0;
3230 }
3231
3232 static int link_carrier_gained(Link *link) {
3233 int r;
3234
3235 assert(link);
3236
3237 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3238 r = link_acquire_conf(link);
3239 if (r < 0) {
3240 link_enter_failed(link);
3241 return r;
3242 }
3243
3244 r = link_request_set_addresses(link);
3245 if (r < 0)
3246 return r;
3247 }
3248
3249 r = link_handle_bound_by_list(link);
3250 if (r < 0)
3251 return r;
3252
3253 return 0;
3254 }
3255
3256 static int link_carrier_lost(Link *link) {
3257 int r;
3258
3259 assert(link);
3260
3261 if (link->network && link->network->ignore_carrier_loss)
3262 return 0;
3263
3264 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3265 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3266 * configuration and stop the clients as well. */
3267 if (link->setting_mtu)
3268 return 0;
3269
3270 r = link_stop_clients(link);
3271 if (r < 0) {
3272 link_enter_failed(link);
3273 return r;
3274 }
3275
3276 if (link_dhcp4_server_enabled(link))
3277 (void) sd_dhcp_server_stop(link->dhcp_server);
3278
3279 r = link_drop_config(link);
3280 if (r < 0)
3281 return r;
3282
3283 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3284 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3285 r = link_drop_foreign_config(link);
3286 if (r < 0)
3287 return r;
3288 }
3289
3290 r = link_handle_bound_by_list(link);
3291 if (r < 0)
3292 return r;
3293
3294 return 0;
3295 }
3296
3297 int link_carrier_reset(Link *link) {
3298 int r;
3299
3300 assert(link);
3301
3302 if (link_has_carrier(link)) {
3303 r = link_carrier_lost(link);
3304 if (r < 0)
3305 return r;
3306
3307 r = link_carrier_gained(link);
3308 if (r < 0)
3309 return r;
3310
3311 log_link_info(link, "Reset carrier");
3312 }
3313
3314 return 0;
3315 }
3316
3317 int link_update(Link *link, sd_netlink_message *m) {
3318 struct ether_addr mac;
3319 const char *ifname;
3320 uint32_t mtu;
3321 bool had_carrier, carrier_gained, carrier_lost;
3322 int r;
3323
3324 assert(link);
3325 assert(link->ifname);
3326 assert(m);
3327
3328 if (link->state == LINK_STATE_LINGER) {
3329 log_link_info(link, "Link re-added");
3330 link_set_state(link, LINK_STATE_CONFIGURING);
3331
3332 r = link_new_carrier_maps(link);
3333 if (r < 0)
3334 return r;
3335 }
3336
3337 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3338 if (r >= 0 && !streq(ifname, link->ifname)) {
3339 Manager *manager = link->manager;
3340
3341 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3342
3343 link_drop(link);
3344 r = link_add(manager, m, &link);
3345 if (r < 0)
3346 return r;
3347 }
3348
3349 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3350 if (r >= 0 && mtu > 0) {
3351 link->mtu = mtu;
3352 if (link->original_mtu == 0) {
3353 link->original_mtu = mtu;
3354 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3355 }
3356
3357 if (link->dhcp_client) {
3358 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3359 link->mtu);
3360 if (r < 0)
3361 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3362 }
3363
3364 if (link->radv) {
3365 r = sd_radv_set_mtu(link->radv, link->mtu);
3366 if (r < 0)
3367 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3368 }
3369 }
3370
3371 /* The kernel may broadcast NEWLINK messages without the MAC address
3372 set, simply ignore them. */
3373 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3374 if (r >= 0) {
3375 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3376 ETH_ALEN)) {
3377
3378 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3379 ETH_ALEN);
3380
3381 log_link_debug(link, "MAC address: "
3382 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3383 mac.ether_addr_octet[0],
3384 mac.ether_addr_octet[1],
3385 mac.ether_addr_octet[2],
3386 mac.ether_addr_octet[3],
3387 mac.ether_addr_octet[4],
3388 mac.ether_addr_octet[5]);
3389
3390 if (link->ipv4ll) {
3391 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3392 if (r < 0)
3393 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3394 }
3395
3396 if (link->dhcp_client) {
3397 r = sd_dhcp_client_set_mac(link->dhcp_client,
3398 (const uint8_t *) &link->mac,
3399 sizeof (link->mac),
3400 ARPHRD_ETHER);
3401 if (r < 0)
3402 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3403
3404 r = dhcp4_set_client_identifier(link);
3405 if (r < 0)
3406 return r;
3407 }
3408
3409 if (link->dhcp6_client) {
3410 const DUID* duid = link_get_duid(link);
3411
3412 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3413 (const uint8_t *) &link->mac,
3414 sizeof (link->mac),
3415 ARPHRD_ETHER);
3416 if (r < 0)
3417 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3418
3419 if (link->network->iaid_set) {
3420 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3421 link->network->iaid);
3422 if (r < 0)
3423 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3424 }
3425
3426 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3427 duid->type,
3428 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3429 duid->raw_data_len);
3430 if (r < 0)
3431 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3432 }
3433
3434 if (link->radv) {
3435 r = sd_radv_set_mac(link->radv, &link->mac);
3436 if (r < 0)
3437 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3438 }
3439
3440 if (link->ndisc) {
3441 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3442 if (r < 0)
3443 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3444 }
3445 }
3446 }
3447
3448 had_carrier = link_has_carrier(link);
3449
3450 r = link_update_flags(link, m);
3451 if (r < 0)
3452 return r;
3453
3454 r = link_update_lldp(link);
3455 if (r < 0)
3456 return r;
3457
3458 carrier_gained = !had_carrier && link_has_carrier(link);
3459 carrier_lost = had_carrier && !link_has_carrier(link);
3460
3461 if (carrier_gained) {
3462 log_link_info(link, "Gained carrier");
3463
3464 r = link_carrier_gained(link);
3465 if (r < 0)
3466 return r;
3467 } else if (carrier_lost) {
3468 log_link_info(link, "Lost carrier");
3469
3470 r = link_carrier_lost(link);
3471 if (r < 0)
3472 return r;
3473 }
3474
3475 return 0;
3476 }
3477
3478 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3479 bool space = false;
3480 Iterator i;
3481 Link *link;
3482
3483 assert(f);
3484 assert(prefix);
3485
3486 if (hashmap_isempty(h))
3487 return;
3488
3489 fputs(prefix, f);
3490 HASHMAP_FOREACH(link, h, i) {
3491 if (space)
3492 fputc(' ', f);
3493
3494 fprintf(f, "%i", link->ifindex);
3495 space = true;
3496 }
3497
3498 fputc('\n', f);
3499 }
3500
3501 int link_save(Link *link) {
3502 _cleanup_free_ char *temp_path = NULL;
3503 _cleanup_fclose_ FILE *f = NULL;
3504 const char *admin_state, *oper_state;
3505 Address *a;
3506 Route *route;
3507 Iterator i;
3508 int r;
3509
3510 assert(link);
3511 assert(link->state_file);
3512 assert(link->lease_file);
3513 assert(link->manager);
3514
3515 if (link->state == LINK_STATE_LINGER) {
3516 (void) unlink(link->state_file);
3517 return 0;
3518 }
3519
3520 link_lldp_save(link);
3521
3522 admin_state = link_state_to_string(link->state);
3523 assert(admin_state);
3524
3525 oper_state = link_operstate_to_string(link->operstate);
3526 assert(oper_state);
3527
3528 r = fopen_temporary(link->state_file, &f, &temp_path);
3529 if (r < 0)
3530 goto fail;
3531
3532 (void) fchmod(fileno(f), 0644);
3533
3534 fprintf(f,
3535 "# This is private data. Do not parse.\n"
3536 "ADMIN_STATE=%s\n"
3537 "OPER_STATE=%s\n",
3538 admin_state, oper_state);
3539
3540 if (link->network) {
3541 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
3542 const char *dhcp_domainname = NULL, *p;
3543 sd_dhcp6_lease *dhcp6_lease = NULL;
3544 unsigned j;
3545 bool space;
3546
3547 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3548 yes_no(link->network->required_for_online));
3549
3550 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
3551 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
3552
3553 if (link->dhcp6_client) {
3554 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3555 if (r < 0 && r != -ENOMSG)
3556 log_link_debug(link, "No DHCPv6 lease");
3557 }
3558
3559 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3560
3561 fputs("DNS=", f);
3562 space = false;
3563
3564 for (j = 0; j < link->network->n_dns; j++) {
3565 _cleanup_free_ char *b = NULL;
3566
3567 r = in_addr_to_string(link->network->dns[j].family,
3568 &link->network->dns[j].address, &b);
3569 if (r < 0) {
3570 log_debug_errno(r, "Failed to format address, ignoring: %m");
3571 continue;
3572 }
3573
3574 if (space)
3575 fputc(' ', f);
3576 fputs(b, f);
3577 space = true;
3578 }
3579
3580 if (link->network->dhcp_use_dns &&
3581 link->dhcp_lease) {
3582 const struct in_addr *addresses;
3583
3584 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3585 if (r > 0)
3586 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3587 space = true;
3588 }
3589
3590 if (link->network->dhcp_use_dns && dhcp6_lease) {
3591 struct in6_addr *in6_addrs;
3592
3593 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3594 if (r > 0) {
3595 if (space)
3596 fputc(' ', f);
3597 serialize_in6_addrs(f, in6_addrs, r);
3598 space = true;
3599 }
3600 }
3601
3602 /* Make sure to flush out old entries before we use the NDISC data */
3603 ndisc_vacuum(link);
3604
3605 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3606 NDiscRDNSS *dd;
3607
3608 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3609 if (space)
3610 fputc(' ', f);
3611
3612 serialize_in6_addrs(f, &dd->address, 1);
3613 space = true;
3614 }
3615 }
3616
3617 fputc('\n', f);
3618
3619 fputs("NTP=", f);
3620 space = false;
3621 fputstrv(f, link->network->ntp, NULL, &space);
3622
3623 if (link->network->dhcp_use_ntp &&
3624 link->dhcp_lease) {
3625 const struct in_addr *addresses;
3626
3627 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3628 if (r > 0)
3629 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3630 space = true;
3631 }
3632
3633 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3634 struct in6_addr *in6_addrs;
3635 char **hosts;
3636
3637 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3638 &in6_addrs);
3639 if (r > 0) {
3640 if (space)
3641 fputc(' ', f);
3642 serialize_in6_addrs(f, in6_addrs, r);
3643 space = true;
3644 }
3645
3646 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3647 if (r > 0)
3648 fputstrv(f, hosts, NULL, &space);
3649 }
3650
3651 fputc('\n', f);
3652
3653 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3654 if (link->dhcp_lease) {
3655 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3656 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3657 }
3658 if (dhcp6_lease)
3659 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3660 }
3661
3662 fputs("DOMAINS=", f);
3663 space = false;
3664 ORDERED_SET_FOREACH(p, link->network->search_domains, i)
3665 fputs_with_space(f, p, NULL, &space);
3666
3667 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3668 NDiscDNSSL *dd;
3669
3670 if (dhcp_domainname)
3671 fputs_with_space(f, dhcp_domainname, NULL, &space);
3672 if (dhcp_domains)
3673 fputstrv(f, dhcp_domains, NULL, &space);
3674 if (dhcp6_domains)
3675 fputstrv(f, dhcp6_domains, NULL, &space);
3676
3677 SET_FOREACH(dd, link->ndisc_dnssl, i)
3678 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3679 }
3680
3681 fputc('\n', f);
3682
3683 fputs("ROUTE_DOMAINS=", f);
3684 space = false;
3685 ORDERED_SET_FOREACH(p, link->network->route_domains, i)
3686 fputs_with_space(f, p, NULL, &space);
3687
3688 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3689 NDiscDNSSL *dd;
3690
3691 if (dhcp_domainname)
3692 fputs_with_space(f, dhcp_domainname, NULL, &space);
3693 if (dhcp_domains)
3694 fputstrv(f, dhcp_domains, NULL, &space);
3695 if (dhcp6_domains)
3696 fputstrv(f, dhcp6_domains, NULL, &space);
3697
3698 SET_FOREACH(dd, link->ndisc_dnssl, i)
3699 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3700 }
3701
3702 fputc('\n', f);
3703
3704 fprintf(f, "LLMNR=%s\n",
3705 resolve_support_to_string(link->network->llmnr));
3706 fprintf(f, "MDNS=%s\n",
3707 resolve_support_to_string(link->network->mdns));
3708 if (link->network->dns_default_route >= 0)
3709 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
3710
3711 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3712 fprintf(f, "DNS_OVER_TLS=%s\n",
3713 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
3714
3715 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3716 fprintf(f, "DNSSEC=%s\n",
3717 dnssec_mode_to_string(link->network->dnssec_mode));
3718
3719 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3720 const char *n;
3721
3722 fputs("DNSSEC_NTA=", f);
3723 space = false;
3724 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3725 fputs_with_space(f, n, NULL, &space);
3726 fputc('\n', f);
3727 }
3728
3729 fputs("ADDRESSES=", f);
3730 space = false;
3731 SET_FOREACH(a, link->addresses, i) {
3732 _cleanup_free_ char *address_str = NULL;
3733
3734 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3735 if (r < 0)
3736 goto fail;
3737
3738 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3739 space = true;
3740 }
3741 fputc('\n', f);
3742
3743 fputs("ROUTES=", f);
3744 space = false;
3745 SET_FOREACH(route, link->routes, i) {
3746 _cleanup_free_ char *route_str = NULL;
3747
3748 r = in_addr_to_string(route->family, &route->dst, &route_str);
3749 if (r < 0)
3750 goto fail;
3751
3752 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
3753 space ? " " : "", route_str,
3754 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3755 space = true;
3756 }
3757
3758 fputc('\n', f);
3759 }
3760
3761 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3762 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3763
3764 if (link->dhcp_lease) {
3765 struct in_addr address;
3766 const char *tz = NULL;
3767
3768 assert(link->network);
3769
3770 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3771 if (r >= 0)
3772 fprintf(f, "TIMEZONE=%s\n", tz);
3773
3774 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3775 if (r >= 0) {
3776 fputs("DHCP4_ADDRESS=", f);
3777 serialize_in_addrs(f, &address, 1, false, NULL);
3778 fputc('\n', f);
3779 }
3780
3781 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3782 if (r < 0)
3783 goto fail;
3784
3785 fprintf(f,
3786 "DHCP_LEASE=%s\n",
3787 link->lease_file);
3788 } else
3789 (void) unlink(link->lease_file);
3790
3791 if (link->ipv4ll) {
3792 struct in_addr address;
3793
3794 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3795 if (r >= 0) {
3796 fputs("IPV4LL_ADDRESS=", f);
3797 serialize_in_addrs(f, &address, 1, false, NULL);
3798 fputc('\n', f);
3799 }
3800 }
3801
3802 r = fflush_and_check(f);
3803 if (r < 0)
3804 goto fail;
3805
3806 if (rename(temp_path, link->state_file) < 0) {
3807 r = -errno;
3808 goto fail;
3809 }
3810
3811 return 0;
3812
3813 fail:
3814 (void) unlink(link->state_file);
3815 if (temp_path)
3816 (void) unlink(temp_path);
3817
3818 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3819 }
3820
3821 /* The serialized state in /run is no longer up-to-date. */
3822 void link_dirty(Link *link) {
3823 int r;
3824
3825 assert(link);
3826
3827 /* mark manager dirty as link is dirty */
3828 manager_dirty(link->manager);
3829
3830 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3831 if (r < 0)
3832 /* allocation errors are ignored */
3833 return;
3834
3835 r = set_put(link->manager->dirty_links, link);
3836 if (r <= 0)
3837 /* don't take another ref if the link was already dirty */
3838 return;
3839
3840 link_ref(link);
3841 }
3842
3843 /* The serialized state in /run is up-to-date */
3844 void link_clean(Link *link) {
3845 assert(link);
3846 assert(link->manager);
3847
3848 link_unref(set_remove(link->manager->dirty_links, link));
3849 }
3850
3851 static const char* const link_state_table[_LINK_STATE_MAX] = {
3852 [LINK_STATE_PENDING] = "pending",
3853 [LINK_STATE_INITIALIZED] = "initialized",
3854 [LINK_STATE_CONFIGURING] = "configuring",
3855 [LINK_STATE_CONFIGURED] = "configured",
3856 [LINK_STATE_UNMANAGED] = "unmanaged",
3857 [LINK_STATE_FAILED] = "failed",
3858 [LINK_STATE_LINGER] = "linger",
3859 };
3860
3861 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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