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Merge pull request #12574 from yuwata/network-mtu-issue-12552
[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 ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1641 return true;
1642
1643 return false;
1644 }
1645
1646 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1647 int r;
1648
1649 assert(link);
1650
1651 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1652 return 1;
1653
1654 r = sd_netlink_message_get_errno(m);
1655 if (r < 0)
1656 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1657
1658 return 1;
1659 }
1660
1661 static int link_configure_addrgen_mode(Link *link) {
1662 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1663 uint8_t ipv6ll_mode;
1664 int r;
1665
1666 assert(link);
1667 assert(link->network);
1668 assert(link->manager);
1669 assert(link->manager->rtnl);
1670
1671 if (!socket_ipv6_is_supported())
1672 return 0;
1673
1674 log_link_debug(link, "Setting address genmode for link");
1675
1676 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1677 if (r < 0)
1678 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1679
1680 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1681 if (r < 0)
1682 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1683
1684 r = sd_netlink_message_open_container(req, AF_INET6);
1685 if (r < 0)
1686 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1687
1688 if (!link_ipv6ll_enabled(link))
1689 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1690 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1691 /* The file may not exist. And event if it exists, when stable_secret is unset,
1692 * reading the file fails with EIO. */
1693 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1694 else
1695 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1696
1697 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1698 if (r < 0)
1699 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1700
1701 r = sd_netlink_message_close_container(req);
1702 if (r < 0)
1703 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1704
1705 r = sd_netlink_message_close_container(req);
1706 if (r < 0)
1707 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1708
1709 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1710 link_netlink_destroy_callback, link);
1711 if (r < 0)
1712 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1713
1714 link_ref(link);
1715
1716 return 0;
1717 }
1718
1719 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1720 int r;
1721
1722 assert(link);
1723
1724 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1725 return 1;
1726
1727 r = sd_netlink_message_get_errno(m);
1728 if (r < 0)
1729 /* we warn but don't fail the link, as it may be brought up later */
1730 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1731
1732 return 1;
1733 }
1734
1735 static int link_up(Link *link) {
1736 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1737 int r;
1738
1739 assert(link);
1740 assert(link->network);
1741 assert(link->manager);
1742 assert(link->manager->rtnl);
1743
1744 log_link_debug(link, "Bringing link up");
1745
1746 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1747 if (r < 0)
1748 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1749
1750 /* set it free if not enslaved with networkd */
1751 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1752 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1753 if (r < 0)
1754 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1755 }
1756
1757 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1758 if (r < 0)
1759 return log_link_error_errno(link, r, "Could not set link flags: %m");
1760
1761 if (link->network->mac) {
1762 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1763 if (r < 0)
1764 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1765 }
1766
1767 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1768 link_netlink_destroy_callback, link);
1769 if (r < 0)
1770 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1771
1772 link_ref(link);
1773
1774 return 0;
1775 }
1776
1777 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1778 int r;
1779
1780 assert(link);
1781
1782 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1783 return 1;
1784
1785 r = sd_netlink_message_get_errno(m);
1786 if (r < 0)
1787 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1788
1789 return 1;
1790 }
1791
1792 int link_down(Link *link, link_netlink_message_handler_t callback) {
1793 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1794 int r;
1795
1796 assert(link);
1797 assert(link->manager);
1798 assert(link->manager->rtnl);
1799
1800 log_link_debug(link, "Bringing link down");
1801
1802 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1803 RTM_SETLINK, link->ifindex);
1804 if (r < 0)
1805 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1806
1807 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1808 if (r < 0)
1809 return log_link_error_errno(link, r, "Could not set link flags: %m");
1810
1811 r = netlink_call_async(link->manager->rtnl, NULL, req,
1812 callback ?: link_down_handler,
1813 link_netlink_destroy_callback, link);
1814 if (r < 0)
1815 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1816
1817 link_ref(link);
1818
1819 return 0;
1820 }
1821
1822 static int link_handle_bound_to_list(Link *link) {
1823 Link *l;
1824 Iterator i;
1825 int r;
1826 bool required_up = false;
1827 bool link_is_up = false;
1828
1829 assert(link);
1830
1831 if (hashmap_isempty(link->bound_to_links))
1832 return 0;
1833
1834 if (link->flags & IFF_UP)
1835 link_is_up = true;
1836
1837 HASHMAP_FOREACH (l, link->bound_to_links, i)
1838 if (link_has_carrier(l)) {
1839 required_up = true;
1840 break;
1841 }
1842
1843 if (!required_up && link_is_up) {
1844 r = link_down(link, NULL);
1845 if (r < 0)
1846 return r;
1847 } else if (required_up && !link_is_up) {
1848 r = link_up(link);
1849 if (r < 0)
1850 return r;
1851 }
1852
1853 return 0;
1854 }
1855
1856 static int link_handle_bound_by_list(Link *link) {
1857 Iterator i;
1858 Link *l;
1859 int r;
1860
1861 assert(link);
1862
1863 if (hashmap_isempty(link->bound_by_links))
1864 return 0;
1865
1866 HASHMAP_FOREACH (l, link->bound_by_links, i) {
1867 r = link_handle_bound_to_list(l);
1868 if (r < 0)
1869 return r;
1870 }
1871
1872 return 0;
1873 }
1874
1875 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1876 int r;
1877
1878 assert(link);
1879 assert(carrier);
1880
1881 if (link == carrier)
1882 return 0;
1883
1884 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1885 return 0;
1886
1887 r = hashmap_ensure_allocated(h, NULL);
1888 if (r < 0)
1889 return r;
1890
1891 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1892 if (r < 0)
1893 return r;
1894
1895 return 0;
1896 }
1897
1898 static int link_new_bound_by_list(Link *link) {
1899 Manager *m;
1900 Link *carrier;
1901 Iterator i;
1902 int r;
1903 bool list_updated = false;
1904
1905 assert(link);
1906 assert(link->manager);
1907
1908 m = link->manager;
1909
1910 HASHMAP_FOREACH(carrier, m->links, i) {
1911 if (!carrier->network)
1912 continue;
1913
1914 if (strv_isempty(carrier->network->bind_carrier))
1915 continue;
1916
1917 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
1918 r = link_put_carrier(link, carrier, &link->bound_by_links);
1919 if (r < 0)
1920 return r;
1921
1922 list_updated = true;
1923 }
1924 }
1925
1926 if (list_updated)
1927 link_dirty(link);
1928
1929 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
1930 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1931 if (r < 0)
1932 return r;
1933
1934 link_dirty(carrier);
1935 }
1936
1937 return 0;
1938 }
1939
1940 static int link_new_bound_to_list(Link *link) {
1941 Manager *m;
1942 Link *carrier;
1943 Iterator i;
1944 int r;
1945 bool list_updated = false;
1946
1947 assert(link);
1948 assert(link->manager);
1949
1950 if (!link->network)
1951 return 0;
1952
1953 if (strv_isempty(link->network->bind_carrier))
1954 return 0;
1955
1956 m = link->manager;
1957
1958 HASHMAP_FOREACH (carrier, m->links, i) {
1959 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
1960 r = link_put_carrier(link, carrier, &link->bound_to_links);
1961 if (r < 0)
1962 return r;
1963
1964 list_updated = true;
1965 }
1966 }
1967
1968 if (list_updated)
1969 link_dirty(link);
1970
1971 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
1972 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
1973 if (r < 0)
1974 return r;
1975
1976 link_dirty(carrier);
1977 }
1978
1979 return 0;
1980 }
1981
1982 static int link_new_carrier_maps(Link *link) {
1983 int r;
1984
1985 r = link_new_bound_by_list(link);
1986 if (r < 0)
1987 return r;
1988
1989 r = link_handle_bound_by_list(link);
1990 if (r < 0)
1991 return r;
1992
1993 r = link_new_bound_to_list(link);
1994 if (r < 0)
1995 return r;
1996
1997 r = link_handle_bound_to_list(link);
1998 if (r < 0)
1999 return r;
2000
2001 return 0;
2002 }
2003
2004 static void link_free_bound_to_list(Link *link) {
2005 Link *bound_to;
2006 Iterator i;
2007
2008 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2009 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2010
2011 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2012 link_dirty(bound_to);
2013 }
2014
2015 return;
2016 }
2017
2018 static void link_free_bound_by_list(Link *link) {
2019 Link *bound_by;
2020 Iterator i;
2021
2022 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2023 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2024
2025 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2026 link_dirty(bound_by);
2027 link_handle_bound_to_list(bound_by);
2028 }
2029 }
2030
2031 return;
2032 }
2033
2034 static void link_free_carrier_maps(Link *link) {
2035 bool list_updated = false;
2036
2037 assert(link);
2038
2039 if (!hashmap_isempty(link->bound_to_links)) {
2040 link_free_bound_to_list(link);
2041 list_updated = true;
2042 }
2043
2044 if (!hashmap_isempty(link->bound_by_links)) {
2045 link_free_bound_by_list(link);
2046 list_updated = true;
2047 }
2048
2049 if (list_updated)
2050 link_dirty(link);
2051
2052 return;
2053 }
2054
2055 static int link_append_to_master(Link *link, NetDev *netdev) {
2056 Link *master;
2057 int r;
2058
2059 assert(link);
2060 assert(netdev);
2061
2062 r = link_get(link->manager, netdev->ifindex, &master);
2063 if (r < 0)
2064 return r;
2065
2066 r = set_ensure_allocated(&master->slaves, NULL);
2067 if (r < 0)
2068 return r;
2069
2070 r = set_put(master->slaves, link);
2071 if (r < 0)
2072 return r;
2073
2074 link_ref(link);
2075 return 0;
2076 }
2077
2078 static void link_drop_from_master(Link *link, NetDev *netdev) {
2079 Link *master;
2080
2081 assert(link);
2082
2083 if (!link->manager || !netdev)
2084 return;
2085
2086 if (link_get(link->manager, netdev->ifindex, &master) < 0)
2087 return;
2088
2089 link_unref(set_remove(master->slaves, link));
2090 }
2091
2092 static void link_detach_from_manager(Link *link) {
2093 if (!link || !link->manager)
2094 return;
2095
2096 link_unref(set_remove(link->manager->links_requesting_uuid, link));
2097 link_clean(link);
2098
2099 /* The following must be called at last. */
2100 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2101 link_unref(link);
2102 }
2103
2104 void link_drop(Link *link) {
2105 if (!link || link->state == LINK_STATE_LINGER)
2106 return;
2107
2108 link_set_state(link, LINK_STATE_LINGER);
2109
2110 link_free_carrier_maps(link);
2111
2112 if (link->network) {
2113 link_drop_from_master(link, link->network->bridge);
2114 link_drop_from_master(link, link->network->bond);
2115 }
2116
2117 log_link_debug(link, "Link removed");
2118
2119 (void) unlink(link->state_file);
2120 link_detach_from_manager(link);
2121 }
2122
2123 static int link_joined(Link *link) {
2124 int r;
2125
2126 assert(link);
2127 assert(link->network);
2128
2129 if (!hashmap_isempty(link->bound_to_links)) {
2130 r = link_handle_bound_to_list(link);
2131 if (r < 0)
2132 return r;
2133 } else if (!(link->flags & IFF_UP)) {
2134 r = link_up(link);
2135 if (r < 0) {
2136 link_enter_failed(link);
2137 return r;
2138 }
2139 }
2140
2141 if (link->network->bridge) {
2142 r = link_set_bridge(link);
2143 if (r < 0)
2144 log_link_error_errno(link, r, "Could not set bridge message: %m");
2145
2146 r = link_append_to_master(link, link->network->bridge);
2147 if (r < 0)
2148 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2149 }
2150
2151 if (link->network->bond) {
2152 r = link_set_bond(link);
2153 if (r < 0)
2154 log_link_error_errno(link, r, "Could not set bond message: %m");
2155
2156 r = link_append_to_master(link, link->network->bond);
2157 if (r < 0)
2158 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2159 }
2160
2161 if (link->network->use_br_vlan &&
2162 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2163 r = link_set_bridge_vlan(link);
2164 if (r < 0)
2165 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2166 }
2167
2168 /* Skip setting up addresses until it gets carrier,
2169 or it would try to set addresses twice,
2170 which is bad for non-idempotent steps. */
2171 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2172 return 0;
2173
2174 return link_request_set_addresses(link);
2175 }
2176
2177 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2178 int r;
2179
2180 assert(link);
2181 assert(link->network);
2182 assert(link->enslaving > 0);
2183 assert(!link->enslaved_raw);
2184
2185 link->enslaving--;
2186
2187 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2188 return 1;
2189
2190 r = sd_netlink_message_get_errno(m);
2191 if (r < 0 && r != -EEXIST) {
2192 log_link_error_errno(link, r, "Could not join netdev: %m");
2193 link_enter_failed(link);
2194 return 1;
2195 } else
2196 log_link_debug(link, "Joined netdev");
2197
2198 if (link->enslaving == 0) {
2199 link->enslaved_raw = true;
2200 link_joined(link);
2201 }
2202
2203 return 1;
2204 }
2205
2206 static int link_enter_join_netdev(Link *link) {
2207 NetDev *netdev;
2208 Iterator i;
2209 int r;
2210
2211 assert(link);
2212 assert(link->network);
2213 assert(link->state == LINK_STATE_INITIALIZED);
2214
2215 link_set_state(link, LINK_STATE_CONFIGURING);
2216
2217 link_dirty(link);
2218 link->enslaving = 0;
2219 link->enslaved_raw = false;
2220
2221 if (link->network->bond) {
2222 if (link->network->bond->state == NETDEV_STATE_READY &&
2223 link->network->bond->ifindex == link->master_ifindex)
2224 return link_joined(link);
2225
2226 log_struct(LOG_DEBUG,
2227 LOG_LINK_INTERFACE(link),
2228 LOG_NETDEV_INTERFACE(link->network->bond),
2229 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2230
2231 link->enslaving++;
2232
2233 r = netdev_join(link->network->bond, link, netdev_join_handler);
2234 if (r < 0) {
2235 log_struct_errno(LOG_WARNING, r,
2236 LOG_LINK_INTERFACE(link),
2237 LOG_NETDEV_INTERFACE(link->network->bond),
2238 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2239 link_enter_failed(link);
2240 return r;
2241 }
2242 }
2243
2244 if (link->network->bridge) {
2245 log_struct(LOG_DEBUG,
2246 LOG_LINK_INTERFACE(link),
2247 LOG_NETDEV_INTERFACE(link->network->bridge),
2248 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2249
2250 link->enslaving++;
2251
2252 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2253 if (r < 0) {
2254 log_struct_errno(LOG_WARNING, r,
2255 LOG_LINK_INTERFACE(link),
2256 LOG_NETDEV_INTERFACE(link->network->bridge),
2257 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2258 link_enter_failed(link);
2259 return r;
2260 }
2261 }
2262
2263 if (link->network->vrf) {
2264 log_struct(LOG_DEBUG,
2265 LOG_LINK_INTERFACE(link),
2266 LOG_NETDEV_INTERFACE(link->network->vrf),
2267 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2268
2269 link->enslaving++;
2270
2271 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2272 if (r < 0) {
2273 log_struct_errno(LOG_WARNING, r,
2274 LOG_LINK_INTERFACE(link),
2275 LOG_NETDEV_INTERFACE(link->network->vrf),
2276 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2277 link_enter_failed(link);
2278 return r;
2279 }
2280 }
2281
2282 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2283
2284 if (netdev->ifindex > 0)
2285 /* Assume already enslaved. */
2286 continue;
2287
2288 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2289 continue;
2290
2291 log_struct(LOG_DEBUG,
2292 LOG_LINK_INTERFACE(link),
2293 LOG_NETDEV_INTERFACE(netdev),
2294 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2295
2296 link->enslaving++;
2297
2298 r = netdev_join(netdev, link, netdev_join_handler);
2299 if (r < 0) {
2300 log_struct_errno(LOG_WARNING, r,
2301 LOG_LINK_INTERFACE(link),
2302 LOG_NETDEV_INTERFACE(netdev),
2303 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2304 link_enter_failed(link);
2305 return r;
2306 }
2307 }
2308
2309 if (link->enslaving == 0)
2310 return link_joined(link);
2311
2312 return 0;
2313 }
2314
2315 static int link_set_ipv4_forward(Link *link) {
2316 int r;
2317
2318 if (!link_ipv4_forward_enabled(link))
2319 return 0;
2320
2321 /* We propagate the forwarding flag from one interface to the
2322 * global setting one way. This means: as long as at least one
2323 * interface was configured at any time that had IP forwarding
2324 * enabled the setting will stay on for good. We do this
2325 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2326 * somewhat in sync (see below). */
2327
2328 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2329 if (r < 0)
2330 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2331
2332 return 0;
2333 }
2334
2335 static int link_set_ipv6_forward(Link *link) {
2336 int r;
2337
2338 if (!link_ipv6_forward_enabled(link))
2339 return 0;
2340
2341 /* On Linux, the IPv6 stack does not know a per-interface
2342 * packet forwarding setting: either packet forwarding is on
2343 * for all, or off for all. We hence don't bother with a
2344 * per-interface setting, but simply propagate the interface
2345 * flag, if it is set, to the global flag, one-way. Note that
2346 * while IPv4 would allow a per-interface flag, we expose the
2347 * same behaviour there and also propagate the setting from
2348 * one to all, to keep things simple (see above). */
2349
2350 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2351 if (r < 0)
2352 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2353
2354 return 0;
2355 }
2356
2357 static int link_set_ipv6_privacy_extensions(Link *link) {
2358 IPv6PrivacyExtensions s;
2359 int r;
2360
2361 s = link_ipv6_privacy_extensions(link);
2362 if (s < 0)
2363 return 0;
2364
2365 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2366 if (r < 0)
2367 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2368
2369 return 0;
2370 }
2371
2372 static int link_set_ipv6_accept_ra(Link *link) {
2373 int r;
2374
2375 /* Make this a NOP if IPv6 is not available */
2376 if (!socket_ipv6_is_supported())
2377 return 0;
2378
2379 if (link->flags & IFF_LOOPBACK)
2380 return 0;
2381
2382 if (!link->network)
2383 return 0;
2384
2385 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2386 if (r < 0)
2387 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2388
2389 return 0;
2390 }
2391
2392 static int link_set_ipv6_dad_transmits(Link *link) {
2393 int r;
2394
2395 /* Make this a NOP if IPv6 is not available */
2396 if (!socket_ipv6_is_supported())
2397 return 0;
2398
2399 if (link->flags & IFF_LOOPBACK)
2400 return 0;
2401
2402 if (!link->network)
2403 return 0;
2404
2405 if (link->network->ipv6_dad_transmits < 0)
2406 return 0;
2407
2408 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2409 if (r < 0)
2410 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2411
2412 return 0;
2413 }
2414
2415 static int link_set_ipv6_hop_limit(Link *link) {
2416 int r;
2417
2418 /* Make this a NOP if IPv6 is not available */
2419 if (!socket_ipv6_is_supported())
2420 return 0;
2421
2422 if (link->flags & IFF_LOOPBACK)
2423 return 0;
2424
2425 if (!link->network)
2426 return 0;
2427
2428 if (link->network->ipv6_hop_limit < 0)
2429 return 0;
2430
2431 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2432 if (r < 0)
2433 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2434
2435 return 0;
2436 }
2437
2438 static int link_set_ipv6_mtu(Link *link) {
2439 int r;
2440
2441 /* Make this a NOP if IPv6 is not available */
2442 if (!socket_ipv6_is_supported())
2443 return 0;
2444
2445 if (link->flags & IFF_LOOPBACK)
2446 return 0;
2447
2448 if (link->network->ipv6_mtu == 0)
2449 return 0;
2450
2451 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2452 if (r < 0)
2453 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2454
2455 return 0;
2456 }
2457
2458 static bool link_is_static_address_configured(Link *link, Address *address) {
2459 Address *net_address;
2460
2461 assert(link);
2462 assert(address);
2463
2464 if (!link->network)
2465 return false;
2466
2467 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2468 if (address_equal(net_address, address))
2469 return true;
2470
2471 return false;
2472 }
2473
2474 static bool link_is_static_route_configured(Link *link, Route *route) {
2475 Route *net_route;
2476
2477 assert(link);
2478 assert(route);
2479
2480 if (!link->network)
2481 return false;
2482
2483 LIST_FOREACH(routes, net_route, link->network->static_routes)
2484 if (route_equal(net_route, route))
2485 return true;
2486
2487 return false;
2488 }
2489
2490 static int link_drop_foreign_config(Link *link) {
2491 Address *address;
2492 Route *route;
2493 Iterator i;
2494 int r;
2495
2496 SET_FOREACH(address, link->addresses_foreign, i) {
2497 /* we consider IPv6LL addresses to be managed by the kernel */
2498 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2499 continue;
2500
2501 if (link_is_static_address_configured(link, address)) {
2502 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2503 if (r < 0)
2504 return log_link_error_errno(link, r, "Failed to add address: %m");
2505 } else {
2506 r = address_remove(address, link, NULL);
2507 if (r < 0)
2508 return r;
2509 }
2510 }
2511
2512 SET_FOREACH(route, link->routes_foreign, i) {
2513 /* do not touch routes managed by the kernel */
2514 if (route->protocol == RTPROT_KERNEL)
2515 continue;
2516
2517 if (link_is_static_route_configured(link, route)) {
2518 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2519 if (r < 0)
2520 return r;
2521 } else {
2522 r = route_remove(route, link, NULL);
2523 if (r < 0)
2524 return r;
2525 }
2526 }
2527
2528 return 0;
2529 }
2530
2531 static int link_drop_config(Link *link) {
2532 Address *address, *pool_address;
2533 Route *route;
2534 Iterator i;
2535 int r;
2536
2537 SET_FOREACH(address, link->addresses, i) {
2538 /* we consider IPv6LL addresses to be managed by the kernel */
2539 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2540 continue;
2541
2542 r = address_remove(address, link, NULL);
2543 if (r < 0)
2544 return r;
2545
2546 /* If this address came from an address pool, clean up the pool */
2547 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2548 if (address_equal(address, pool_address)) {
2549 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2550 address_free(pool_address);
2551 break;
2552 }
2553 }
2554 }
2555
2556 SET_FOREACH(route, link->routes, i) {
2557 /* do not touch routes managed by the kernel */
2558 if (route->protocol == RTPROT_KERNEL)
2559 continue;
2560
2561 r = route_remove(route, link, NULL);
2562 if (r < 0)
2563 return r;
2564 }
2565
2566 ndisc_flush(link);
2567
2568 return 0;
2569 }
2570
2571 static int link_configure(Link *link) {
2572 int r;
2573
2574 assert(link);
2575 assert(link->network);
2576 assert(link->state == LINK_STATE_INITIALIZED);
2577
2578 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
2579 return link_configure_can(link);
2580
2581 /* Drop foreign config, but ignore loopback or critical devices.
2582 * We do not want to remove loopback address or addresses used for root NFS. */
2583 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2584 r = link_drop_foreign_config(link);
2585 if (r < 0)
2586 return r;
2587 }
2588
2589 r = link_set_proxy_arp(link);
2590 if (r < 0)
2591 return r;
2592
2593 r = ipv6_proxy_ndp_addresses_configure(link);
2594 if (r < 0)
2595 return r;
2596
2597 r = link_set_ipv4_forward(link);
2598 if (r < 0)
2599 return r;
2600
2601 r = link_set_ipv6_forward(link);
2602 if (r < 0)
2603 return r;
2604
2605 r = link_set_ipv6_privacy_extensions(link);
2606 if (r < 0)
2607 return r;
2608
2609 r = link_set_ipv6_accept_ra(link);
2610 if (r < 0)
2611 return r;
2612
2613 r = link_set_ipv6_dad_transmits(link);
2614 if (r < 0)
2615 return r;
2616
2617 r = link_set_ipv6_hop_limit(link);
2618 if (r < 0)
2619 return r;
2620
2621 r = link_set_flags(link);
2622 if (r < 0)
2623 return r;
2624
2625 r = link_set_ipv6_mtu(link);
2626 if (r < 0)
2627 return r;
2628
2629 if (link_ipv4ll_enabled(link) || link_ipv4ll_fallback_enabled(link)) {
2630 r = ipv4ll_configure(link);
2631 if (r < 0)
2632 return r;
2633 }
2634
2635 if (link_dhcp4_enabled(link)) {
2636 r = dhcp4_set_promote_secondaries(link);
2637 if (r < 0)
2638 return r;
2639
2640 r = dhcp4_configure(link);
2641 if (r < 0)
2642 return r;
2643 }
2644
2645 if (link_dhcp4_server_enabled(link)) {
2646 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2647 if (r < 0)
2648 return r;
2649
2650 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2651 if (r < 0)
2652 return r;
2653 }
2654
2655 if (link_dhcp6_enabled(link) ||
2656 link_ipv6_accept_ra_enabled(link)) {
2657 r = dhcp6_configure(link);
2658 if (r < 0)
2659 return r;
2660 }
2661
2662 if (link_ipv6_accept_ra_enabled(link)) {
2663 r = ndisc_configure(link);
2664 if (r < 0)
2665 return r;
2666 }
2667
2668 if (link_radv_enabled(link)) {
2669 r = radv_configure(link);
2670 if (r < 0)
2671 return r;
2672 }
2673
2674 if (link_lldp_rx_enabled(link)) {
2675 r = link_lldp_rx_configure(link);
2676 if (r < 0)
2677 return r;
2678 }
2679
2680 r = link_configure_mtu(link);
2681 if (r < 0)
2682 return r;
2683
2684 r = link_configure_addrgen_mode(link);
2685 if (r < 0)
2686 return r;
2687
2688 return link_configure_after_setting_mtu(link);
2689 }
2690
2691 static int link_configure_after_setting_mtu(Link *link) {
2692 int r;
2693
2694 assert(link);
2695 assert(link->network);
2696 assert(link->state == LINK_STATE_INITIALIZED);
2697
2698 if (link->setting_mtu)
2699 return 0;
2700
2701 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2702 r = link_acquire_conf(link);
2703 if (r < 0)
2704 return r;
2705 }
2706
2707 return link_enter_join_netdev(link);
2708 }
2709
2710 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
2711 assert(duid);
2712
2713 if (duid->raw_data_len > 0)
2714 return 0;
2715
2716 if (duid->type != DUID_TYPE_UUID)
2717 return -EINVAL;
2718
2719 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
2720 duid->raw_data_len = sizeof(sd_id128_t);
2721
2722 return 1;
2723 }
2724
2725 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
2726 Manager *manager = userdata;
2727 const sd_bus_error *e;
2728 const void *a;
2729 size_t sz;
2730 DUID *duid;
2731 Link *link;
2732 int r;
2733
2734 assert(m);
2735 assert(manager);
2736
2737 e = sd_bus_message_get_error(m);
2738 if (e) {
2739 log_error_errno(sd_bus_error_get_errno(e),
2740 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
2741 e->message);
2742 goto configure;
2743 }
2744
2745 r = sd_bus_message_read_array(m, 'y', &a, &sz);
2746 if (r < 0)
2747 goto configure;
2748
2749 if (sz != sizeof(sd_id128_t)) {
2750 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
2751 goto configure;
2752 }
2753
2754 memcpy(&manager->product_uuid, a, sz);
2755 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
2756 (void) duid_set_uuid(duid, manager->product_uuid);
2757
2758 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
2759
2760 configure:
2761 while ((link = set_steal_first(manager->links_requesting_uuid))) {
2762 r = link_configure(link);
2763 if (r < 0)
2764 log_link_error_errno(link, r, "Failed to configure link: %m");
2765 }
2766
2767 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
2768
2769 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
2770 * even if the method fails. */
2771 manager->has_product_uuid = true;
2772
2773 return 1;
2774 }
2775
2776 static bool link_requires_uuid(Link *link) {
2777 const DUID *duid;
2778
2779 assert(link);
2780 assert(link->manager);
2781 assert(link->network);
2782
2783 duid = link_get_duid(link);
2784 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
2785 return false;
2786
2787 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
2788 return true;
2789
2790 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
2791 return true;
2792
2793 return false;
2794 }
2795
2796 static int link_configure_duid(Link *link) {
2797 Manager *m;
2798 DUID *duid;
2799 int r;
2800
2801 assert(link);
2802 assert(link->manager);
2803 assert(link->network);
2804
2805 m = link->manager;
2806 duid = link_get_duid(link);
2807
2808 if (!link_requires_uuid(link))
2809 return 1;
2810
2811 if (m->has_product_uuid) {
2812 (void) duid_set_uuid(duid, m->product_uuid);
2813 return 1;
2814 }
2815
2816 if (!m->links_requesting_uuid) {
2817 r = manager_request_product_uuid(m, link);
2818 if (r < 0) {
2819 if (r == -ENOMEM)
2820 return r;
2821
2822 log_link_warning_errno(link, r,
2823 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
2824 return 1;
2825 }
2826 } else {
2827 r = set_put(m->links_requesting_uuid, link);
2828 if (r < 0)
2829 return log_oom();
2830
2831 r = set_put(m->duids_requesting_uuid, duid);
2832 if (r < 0)
2833 return log_oom();
2834 }
2835
2836 return 0;
2837 }
2838
2839 static int link_initialized_and_synced(Link *link) {
2840 Network *network;
2841 int r;
2842
2843 assert(link);
2844 assert(link->ifname);
2845 assert(link->manager);
2846
2847 /* We may get called either from the asynchronous netlink callback,
2848 * or directly for link_add() if running in a container. See link_add(). */
2849 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
2850 return 0;
2851
2852 log_link_debug(link, "Link state is up-to-date");
2853 link_set_state(link, LINK_STATE_INITIALIZED);
2854
2855 r = link_new_bound_by_list(link);
2856 if (r < 0)
2857 return r;
2858
2859 r = link_handle_bound_by_list(link);
2860 if (r < 0)
2861 return r;
2862
2863 if (!link->network) {
2864 r = network_get(link->manager, link->sd_device, link->ifname,
2865 &link->mac, &network);
2866 if (r == -ENOENT) {
2867 link_enter_unmanaged(link);
2868 return 0;
2869 } else if (r == 0 && network->unmanaged) {
2870 link_enter_unmanaged(link);
2871 return 0;
2872 } else if (r < 0)
2873 return r;
2874
2875 if (link->flags & IFF_LOOPBACK) {
2876 if (network->link_local != ADDRESS_FAMILY_NO)
2877 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2878
2879 if (network->dhcp != ADDRESS_FAMILY_NO)
2880 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2881
2882 if (network->dhcp_server)
2883 log_link_debug(link, "Ignoring DHCP server for loopback link");
2884 }
2885
2886 r = network_apply(network, link);
2887 if (r < 0)
2888 return r;
2889 }
2890
2891 r = link_new_bound_to_list(link);
2892 if (r < 0)
2893 return r;
2894
2895 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
2896 * link_configure() is called later asynchronously. */
2897 r = link_configure_duid(link);
2898 if (r <= 0)
2899 return r;
2900
2901 r = link_configure(link);
2902 if (r < 0)
2903 return r;
2904
2905 return 0;
2906 }
2907
2908 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2909 (void) link_initialized_and_synced(link);
2910 return 1;
2911 }
2912
2913 int link_initialized(Link *link, sd_device *device) {
2914 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2915 int r;
2916
2917 assert(link);
2918 assert(link->manager);
2919 assert(link->manager->rtnl);
2920 assert(device);
2921
2922 if (link->state != LINK_STATE_PENDING)
2923 return 0;
2924
2925 if (link->sd_device)
2926 return 0;
2927
2928 log_link_debug(link, "udev initialized link");
2929 link_set_state(link, LINK_STATE_INITIALIZED);
2930
2931 link->sd_device = sd_device_ref(device);
2932
2933 /* udev has initialized the link, but we don't know if we have yet
2934 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2935 * when it returns we know that the pending NEWLINKs have already been
2936 * processed and that we are up-to-date */
2937
2938 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2939 link->ifindex);
2940 if (r < 0)
2941 return r;
2942
2943 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
2944 link_netlink_destroy_callback, link);
2945 if (r < 0)
2946 return r;
2947
2948 link_ref(link);
2949
2950 return 0;
2951 }
2952
2953 static int link_load(Link *link) {
2954 _cleanup_free_ char *network_file = NULL,
2955 *addresses = NULL,
2956 *routes = NULL,
2957 *dhcp4_address = NULL,
2958 *ipv4ll_address = NULL;
2959 union in_addr_union address;
2960 union in_addr_union route_dst;
2961 const char *p;
2962 int r;
2963
2964 assert(link);
2965
2966 r = parse_env_file(NULL, link->state_file,
2967 "NETWORK_FILE", &network_file,
2968 "ADDRESSES", &addresses,
2969 "ROUTES", &routes,
2970 "DHCP4_ADDRESS", &dhcp4_address,
2971 "IPV4LL_ADDRESS", &ipv4ll_address);
2972 if (r < 0 && r != -ENOENT)
2973 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
2974
2975 if (network_file) {
2976 Network *network;
2977 char *suffix;
2978
2979 /* drop suffix */
2980 suffix = strrchr(network_file, '.');
2981 if (!suffix) {
2982 log_link_debug(link, "Failed to get network name from %s", network_file);
2983 goto network_file_fail;
2984 }
2985 *suffix = '\0';
2986
2987 r = network_get_by_name(link->manager, basename(network_file), &network);
2988 if (r < 0) {
2989 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
2990 goto network_file_fail;
2991 }
2992
2993 r = network_apply(network, link);
2994 if (r < 0)
2995 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
2996 }
2997
2998 network_file_fail:
2999
3000 if (addresses) {
3001 p = addresses;
3002
3003 for (;;) {
3004 _cleanup_free_ char *address_str = NULL;
3005 char *prefixlen_str;
3006 int family;
3007 unsigned char prefixlen;
3008
3009 r = extract_first_word(&p, &address_str, NULL, 0);
3010 if (r < 0) {
3011 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3012 continue;
3013 }
3014 if (r == 0)
3015 break;
3016
3017 prefixlen_str = strchr(address_str, '/');
3018 if (!prefixlen_str) {
3019 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3020 continue;
3021 }
3022
3023 *prefixlen_str++ = '\0';
3024
3025 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3026 if (r != 1) {
3027 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3028 continue;
3029 }
3030
3031 r = in_addr_from_string_auto(address_str, &family, &address);
3032 if (r < 0) {
3033 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3034 continue;
3035 }
3036
3037 r = address_add(link, family, &address, prefixlen, NULL);
3038 if (r < 0)
3039 return log_link_error_errno(link, r, "Failed to add address: %m");
3040 }
3041 }
3042
3043 if (routes) {
3044 p = routes;
3045
3046 for (;;) {
3047 Route *route;
3048 _cleanup_free_ char *route_str = NULL;
3049 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3050 usec_t lifetime;
3051 char *prefixlen_str;
3052 int family;
3053 unsigned char prefixlen, tos, table;
3054 uint32_t priority;
3055
3056 r = extract_first_word(&p, &route_str, NULL, 0);
3057 if (r < 0) {
3058 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3059 continue;
3060 }
3061 if (r == 0)
3062 break;
3063
3064 prefixlen_str = strchr(route_str, '/');
3065 if (!prefixlen_str) {
3066 log_link_debug(link, "Failed to parse route %s", route_str);
3067 continue;
3068 }
3069
3070 *prefixlen_str++ = '\0';
3071
3072 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3073 if (r != 5) {
3074 log_link_debug(link,
3075 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3076 prefixlen_str);
3077 continue;
3078 }
3079
3080 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3081 if (r < 0) {
3082 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3083 continue;
3084 }
3085
3086 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3087 if (r < 0)
3088 return log_link_error_errno(link, r, "Failed to add route: %m");
3089
3090 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3091 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3092 0, route_expire_handler, route);
3093 if (r < 0)
3094 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3095 }
3096
3097 route->lifetime = lifetime;
3098 sd_event_source_unref(route->expire);
3099 route->expire = TAKE_PTR(expire);
3100 }
3101 }
3102
3103 if (dhcp4_address) {
3104 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3105 if (r < 0) {
3106 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3107 goto dhcp4_address_fail;
3108 }
3109
3110 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3111 if (r < 0)
3112 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3113
3114 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3115 if (r < 0)
3116 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3117 }
3118
3119 dhcp4_address_fail:
3120
3121 if (ipv4ll_address) {
3122 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3123 if (r < 0) {
3124 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3125 goto ipv4ll_address_fail;
3126 }
3127
3128 r = sd_ipv4ll_new(&link->ipv4ll);
3129 if (r < 0)
3130 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3131
3132 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3133 if (r < 0)
3134 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3135 }
3136
3137 ipv4ll_address_fail:
3138
3139 return 0;
3140 }
3141
3142 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3143 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3144 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3145 Link *link;
3146 int r;
3147
3148 assert(m);
3149 assert(m->rtnl);
3150 assert(message);
3151 assert(ret);
3152
3153 r = link_new(m, message, ret);
3154 if (r < 0)
3155 return r;
3156
3157 link = *ret;
3158
3159 log_link_debug(link, "Link %d added", link->ifindex);
3160
3161 r = link_load(link);
3162 if (r < 0)
3163 return r;
3164
3165 if (detect_container() <= 0) {
3166 /* not in a container, udev will be around */
3167 sprintf(ifindex_str, "n%d", link->ifindex);
3168 r = sd_device_new_from_device_id(&device, ifindex_str);
3169 if (r < 0) {
3170 log_link_warning_errno(link, r, "Could not find device: %m");
3171 goto failed;
3172 }
3173
3174 r = sd_device_get_is_initialized(device);
3175 if (r < 0) {
3176 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3177 goto failed;
3178 }
3179 if (r == 0) {
3180 /* not yet ready */
3181 log_link_debug(link, "link pending udev initialization...");
3182 return 0;
3183 }
3184
3185 r = device_is_renaming(device);
3186 if (r < 0) {
3187 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3188 goto failed;
3189 }
3190 if (r > 0) {
3191 log_link_debug(link, "Interface is under renaming, pending initialization.");
3192 return 0;
3193 }
3194
3195 r = link_initialized(link, device);
3196 if (r < 0)
3197 goto failed;
3198 } else {
3199 r = link_initialized_and_synced(link);
3200 if (r < 0)
3201 goto failed;
3202 }
3203
3204 return 0;
3205 failed:
3206 link_enter_failed(link);
3207 return r;
3208 }
3209
3210 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3211 int r;
3212
3213 assert(link);
3214
3215 log_link_info(link, "Gained IPv6LL");
3216
3217 link->ipv6ll_address = *address;
3218 link_check_ready(link);
3219
3220 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3221 r = link_acquire_ipv6_conf(link);
3222 if (r < 0) {
3223 link_enter_failed(link);
3224 return r;
3225 }
3226 }
3227
3228 return 0;
3229 }
3230
3231 static int link_carrier_gained(Link *link) {
3232 int r;
3233
3234 assert(link);
3235
3236 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3237 r = link_acquire_conf(link);
3238 if (r < 0) {
3239 link_enter_failed(link);
3240 return r;
3241 }
3242
3243 r = link_request_set_addresses(link);
3244 if (r < 0)
3245 return r;
3246 }
3247
3248 r = link_handle_bound_by_list(link);
3249 if (r < 0)
3250 return r;
3251
3252 return 0;
3253 }
3254
3255 static int link_carrier_lost(Link *link) {
3256 int r;
3257
3258 assert(link);
3259
3260 if (link->network && link->network->ignore_carrier_loss)
3261 return 0;
3262
3263 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3264 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3265 * configuration and stop the clients as well. */
3266 if (link->setting_mtu)
3267 return 0;
3268
3269 r = link_stop_clients(link);
3270 if (r < 0) {
3271 link_enter_failed(link);
3272 return r;
3273 }
3274
3275 if (link_dhcp4_server_enabled(link))
3276 (void) sd_dhcp_server_stop(link->dhcp_server);
3277
3278 r = link_drop_config(link);
3279 if (r < 0)
3280 return r;
3281
3282 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3283 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3284 r = link_drop_foreign_config(link);
3285 if (r < 0)
3286 return r;
3287 }
3288
3289 r = link_handle_bound_by_list(link);
3290 if (r < 0)
3291 return r;
3292
3293 return 0;
3294 }
3295
3296 int link_carrier_reset(Link *link) {
3297 int r;
3298
3299 assert(link);
3300
3301 if (link_has_carrier(link)) {
3302 r = link_carrier_lost(link);
3303 if (r < 0)
3304 return r;
3305
3306 r = link_carrier_gained(link);
3307 if (r < 0)
3308 return r;
3309
3310 log_link_info(link, "Reset carrier");
3311 }
3312
3313 return 0;
3314 }
3315
3316 int link_update(Link *link, sd_netlink_message *m) {
3317 struct ether_addr mac;
3318 const char *ifname;
3319 uint32_t mtu;
3320 bool had_carrier, carrier_gained, carrier_lost;
3321 int r;
3322
3323 assert(link);
3324 assert(link->ifname);
3325 assert(m);
3326
3327 if (link->state == LINK_STATE_LINGER) {
3328 log_link_info(link, "Link re-added");
3329 link_set_state(link, LINK_STATE_CONFIGURING);
3330
3331 r = link_new_carrier_maps(link);
3332 if (r < 0)
3333 return r;
3334 }
3335
3336 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3337 if (r >= 0 && !streq(ifname, link->ifname)) {
3338 Manager *manager = link->manager;
3339
3340 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3341
3342 link_drop(link);
3343 r = link_add(manager, m, &link);
3344 if (r < 0)
3345 return r;
3346 }
3347
3348 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3349 if (r >= 0 && mtu > 0) {
3350 link->mtu = mtu;
3351 if (link->original_mtu == 0) {
3352 link->original_mtu = mtu;
3353 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3354 }
3355
3356 if (link->dhcp_client) {
3357 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3358 link->mtu);
3359 if (r < 0)
3360 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3361 }
3362
3363 if (link->radv) {
3364 r = sd_radv_set_mtu(link->radv, link->mtu);
3365 if (r < 0)
3366 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3367 }
3368 }
3369
3370 /* The kernel may broadcast NEWLINK messages without the MAC address
3371 set, simply ignore them. */
3372 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3373 if (r >= 0) {
3374 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3375 ETH_ALEN)) {
3376
3377 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3378 ETH_ALEN);
3379
3380 log_link_debug(link, "MAC address: "
3381 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3382 mac.ether_addr_octet[0],
3383 mac.ether_addr_octet[1],
3384 mac.ether_addr_octet[2],
3385 mac.ether_addr_octet[3],
3386 mac.ether_addr_octet[4],
3387 mac.ether_addr_octet[5]);
3388
3389 if (link->ipv4ll) {
3390 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3391 if (r < 0)
3392 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3393 }
3394
3395 if (link->dhcp_client) {
3396 r = sd_dhcp_client_set_mac(link->dhcp_client,
3397 (const uint8_t *) &link->mac,
3398 sizeof (link->mac),
3399 ARPHRD_ETHER);
3400 if (r < 0)
3401 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3402
3403 r = dhcp4_set_client_identifier(link);
3404 if (r < 0)
3405 return r;
3406 }
3407
3408 if (link->dhcp6_client) {
3409 const DUID* duid = link_get_duid(link);
3410
3411 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3412 (const uint8_t *) &link->mac,
3413 sizeof (link->mac),
3414 ARPHRD_ETHER);
3415 if (r < 0)
3416 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3417
3418 if (link->network->iaid_set) {
3419 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3420 link->network->iaid);
3421 if (r < 0)
3422 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3423 }
3424
3425 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3426 duid->type,
3427 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3428 duid->raw_data_len);
3429 if (r < 0)
3430 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3431 }
3432
3433 if (link->radv) {
3434 r = sd_radv_set_mac(link->radv, &link->mac);
3435 if (r < 0)
3436 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3437 }
3438
3439 if (link->ndisc) {
3440 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3441 if (r < 0)
3442 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3443 }
3444 }
3445 }
3446
3447 had_carrier = link_has_carrier(link);
3448
3449 r = link_update_flags(link, m);
3450 if (r < 0)
3451 return r;
3452
3453 r = link_update_lldp(link);
3454 if (r < 0)
3455 return r;
3456
3457 carrier_gained = !had_carrier && link_has_carrier(link);
3458 carrier_lost = had_carrier && !link_has_carrier(link);
3459
3460 if (carrier_gained) {
3461 log_link_info(link, "Gained carrier");
3462
3463 r = link_carrier_gained(link);
3464 if (r < 0)
3465 return r;
3466 } else if (carrier_lost) {
3467 log_link_info(link, "Lost carrier");
3468
3469 r = link_carrier_lost(link);
3470 if (r < 0)
3471 return r;
3472 }
3473
3474 return 0;
3475 }
3476
3477 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3478 bool space = false;
3479 Iterator i;
3480 Link *link;
3481
3482 assert(f);
3483 assert(prefix);
3484
3485 if (hashmap_isempty(h))
3486 return;
3487
3488 fputs(prefix, f);
3489 HASHMAP_FOREACH(link, h, i) {
3490 if (space)
3491 fputc(' ', f);
3492
3493 fprintf(f, "%i", link->ifindex);
3494 space = true;
3495 }
3496
3497 fputc('\n', f);
3498 }
3499
3500 int link_save(Link *link) {
3501 _cleanup_free_ char *temp_path = NULL;
3502 _cleanup_fclose_ FILE *f = NULL;
3503 const char *admin_state, *oper_state;
3504 Address *a;
3505 Route *route;
3506 Iterator i;
3507 int r;
3508
3509 assert(link);
3510 assert(link->state_file);
3511 assert(link->lease_file);
3512 assert(link->manager);
3513
3514 if (link->state == LINK_STATE_LINGER) {
3515 (void) unlink(link->state_file);
3516 return 0;
3517 }
3518
3519 link_lldp_save(link);
3520
3521 admin_state = link_state_to_string(link->state);
3522 assert(admin_state);
3523
3524 oper_state = link_operstate_to_string(link->operstate);
3525 assert(oper_state);
3526
3527 r = fopen_temporary(link->state_file, &f, &temp_path);
3528 if (r < 0)
3529 goto fail;
3530
3531 (void) fchmod(fileno(f), 0644);
3532
3533 fprintf(f,
3534 "# This is private data. Do not parse.\n"
3535 "ADMIN_STATE=%s\n"
3536 "OPER_STATE=%s\n",
3537 admin_state, oper_state);
3538
3539 if (link->network) {
3540 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
3541 const char *dhcp_domainname = NULL, *p;
3542 sd_dhcp6_lease *dhcp6_lease = NULL;
3543 unsigned j;
3544 bool space;
3545
3546 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3547 yes_no(link->network->required_for_online));
3548
3549 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
3550 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
3551
3552 if (link->dhcp6_client) {
3553 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3554 if (r < 0 && r != -ENOMSG)
3555 log_link_debug(link, "No DHCPv6 lease");
3556 }
3557
3558 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3559
3560 fputs("DNS=", f);
3561 space = false;
3562
3563 for (j = 0; j < link->network->n_dns; j++) {
3564 _cleanup_free_ char *b = NULL;
3565
3566 r = in_addr_to_string(link->network->dns[j].family,
3567 &link->network->dns[j].address, &b);
3568 if (r < 0) {
3569 log_debug_errno(r, "Failed to format address, ignoring: %m");
3570 continue;
3571 }
3572
3573 if (space)
3574 fputc(' ', f);
3575 fputs(b, f);
3576 space = true;
3577 }
3578
3579 if (link->network->dhcp_use_dns &&
3580 link->dhcp_lease) {
3581 const struct in_addr *addresses;
3582
3583 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3584 if (r > 0)
3585 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3586 space = true;
3587 }
3588
3589 if (link->network->dhcp_use_dns && dhcp6_lease) {
3590 struct in6_addr *in6_addrs;
3591
3592 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3593 if (r > 0) {
3594 if (space)
3595 fputc(' ', f);
3596 serialize_in6_addrs(f, in6_addrs, r);
3597 space = true;
3598 }
3599 }
3600
3601 /* Make sure to flush out old entries before we use the NDISC data */
3602 ndisc_vacuum(link);
3603
3604 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3605 NDiscRDNSS *dd;
3606
3607 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3608 if (space)
3609 fputc(' ', f);
3610
3611 serialize_in6_addrs(f, &dd->address, 1);
3612 space = true;
3613 }
3614 }
3615
3616 fputc('\n', f);
3617
3618 fputs("NTP=", f);
3619 space = false;
3620 fputstrv(f, link->network->ntp, NULL, &space);
3621
3622 if (link->network->dhcp_use_ntp &&
3623 link->dhcp_lease) {
3624 const struct in_addr *addresses;
3625
3626 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3627 if (r > 0)
3628 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3629 space = true;
3630 }
3631
3632 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3633 struct in6_addr *in6_addrs;
3634 char **hosts;
3635
3636 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3637 &in6_addrs);
3638 if (r > 0) {
3639 if (space)
3640 fputc(' ', f);
3641 serialize_in6_addrs(f, in6_addrs, r);
3642 space = true;
3643 }
3644
3645 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3646 if (r > 0)
3647 fputstrv(f, hosts, NULL, &space);
3648 }
3649
3650 fputc('\n', f);
3651
3652 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3653 if (link->dhcp_lease) {
3654 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3655 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3656 }
3657 if (dhcp6_lease)
3658 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3659 }
3660
3661 fputs("DOMAINS=", f);
3662 space = false;
3663 ORDERED_SET_FOREACH(p, link->network->search_domains, i)
3664 fputs_with_space(f, p, NULL, &space);
3665
3666 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3667 NDiscDNSSL *dd;
3668
3669 if (dhcp_domainname)
3670 fputs_with_space(f, dhcp_domainname, NULL, &space);
3671 if (dhcp_domains)
3672 fputstrv(f, dhcp_domains, NULL, &space);
3673 if (dhcp6_domains)
3674 fputstrv(f, dhcp6_domains, NULL, &space);
3675
3676 SET_FOREACH(dd, link->ndisc_dnssl, i)
3677 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3678 }
3679
3680 fputc('\n', f);
3681
3682 fputs("ROUTE_DOMAINS=", f);
3683 space = false;
3684 ORDERED_SET_FOREACH(p, link->network->route_domains, i)
3685 fputs_with_space(f, p, NULL, &space);
3686
3687 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3688 NDiscDNSSL *dd;
3689
3690 if (dhcp_domainname)
3691 fputs_with_space(f, dhcp_domainname, NULL, &space);
3692 if (dhcp_domains)
3693 fputstrv(f, dhcp_domains, NULL, &space);
3694 if (dhcp6_domains)
3695 fputstrv(f, dhcp6_domains, NULL, &space);
3696
3697 SET_FOREACH(dd, link->ndisc_dnssl, i)
3698 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3699 }
3700
3701 fputc('\n', f);
3702
3703 fprintf(f, "LLMNR=%s\n",
3704 resolve_support_to_string(link->network->llmnr));
3705 fprintf(f, "MDNS=%s\n",
3706 resolve_support_to_string(link->network->mdns));
3707 if (link->network->dns_default_route >= 0)
3708 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
3709
3710 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3711 fprintf(f, "DNS_OVER_TLS=%s\n",
3712 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
3713
3714 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3715 fprintf(f, "DNSSEC=%s\n",
3716 dnssec_mode_to_string(link->network->dnssec_mode));
3717
3718 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3719 const char *n;
3720
3721 fputs("DNSSEC_NTA=", f);
3722 space = false;
3723 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3724 fputs_with_space(f, n, NULL, &space);
3725 fputc('\n', f);
3726 }
3727
3728 fputs("ADDRESSES=", f);
3729 space = false;
3730 SET_FOREACH(a, link->addresses, i) {
3731 _cleanup_free_ char *address_str = NULL;
3732
3733 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3734 if (r < 0)
3735 goto fail;
3736
3737 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3738 space = true;
3739 }
3740 fputc('\n', f);
3741
3742 fputs("ROUTES=", f);
3743 space = false;
3744 SET_FOREACH(route, link->routes, i) {
3745 _cleanup_free_ char *route_str = NULL;
3746
3747 r = in_addr_to_string(route->family, &route->dst, &route_str);
3748 if (r < 0)
3749 goto fail;
3750
3751 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
3752 space ? " " : "", route_str,
3753 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3754 space = true;
3755 }
3756
3757 fputc('\n', f);
3758 }
3759
3760 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3761 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3762
3763 if (link->dhcp_lease) {
3764 struct in_addr address;
3765 const char *tz = NULL;
3766
3767 assert(link->network);
3768
3769 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3770 if (r >= 0)
3771 fprintf(f, "TIMEZONE=%s\n", tz);
3772
3773 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3774 if (r >= 0) {
3775 fputs("DHCP4_ADDRESS=", f);
3776 serialize_in_addrs(f, &address, 1, false, NULL);
3777 fputc('\n', f);
3778 }
3779
3780 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3781 if (r < 0)
3782 goto fail;
3783
3784 fprintf(f,
3785 "DHCP_LEASE=%s\n",
3786 link->lease_file);
3787 } else
3788 (void) unlink(link->lease_file);
3789
3790 if (link->ipv4ll) {
3791 struct in_addr address;
3792
3793 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3794 if (r >= 0) {
3795 fputs("IPV4LL_ADDRESS=", f);
3796 serialize_in_addrs(f, &address, 1, false, NULL);
3797 fputc('\n', f);
3798 }
3799 }
3800
3801 r = fflush_and_check(f);
3802 if (r < 0)
3803 goto fail;
3804
3805 if (rename(temp_path, link->state_file) < 0) {
3806 r = -errno;
3807 goto fail;
3808 }
3809
3810 return 0;
3811
3812 fail:
3813 (void) unlink(link->state_file);
3814 if (temp_path)
3815 (void) unlink(temp_path);
3816
3817 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3818 }
3819
3820 /* The serialized state in /run is no longer up-to-date. */
3821 void link_dirty(Link *link) {
3822 int r;
3823
3824 assert(link);
3825
3826 /* mark manager dirty as link is dirty */
3827 manager_dirty(link->manager);
3828
3829 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3830 if (r < 0)
3831 /* allocation errors are ignored */
3832 return;
3833
3834 r = set_put(link->manager->dirty_links, link);
3835 if (r <= 0)
3836 /* don't take another ref if the link was already dirty */
3837 return;
3838
3839 link_ref(link);
3840 }
3841
3842 /* The serialized state in /run is up-to-date */
3843 void link_clean(Link *link) {
3844 assert(link);
3845 assert(link->manager);
3846
3847 link_unref(set_remove(link->manager->dirty_links, link));
3848 }
3849
3850 static const char* const link_state_table[_LINK_STATE_MAX] = {
3851 [LINK_STATE_PENDING] = "pending",
3852 [LINK_STATE_INITIALIZED] = "initialized",
3853 [LINK_STATE_CONFIGURING] = "configuring",
3854 [LINK_STATE_CONFIGURED] = "configured",
3855 [LINK_STATE_UNMANAGED] = "unmanaged",
3856 [LINK_STATE_FAILED] = "failed",
3857 [LINK_STATE_LINGER] = "linger",
3858 };
3859
3860 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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