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network: update master's ifindex in link_update()
[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/ipvlan.h"
18 #include "netdev/vrf.h"
19 #include "netlink-util.h"
20 #include "network-internal.h"
21 #include "networkd-can.h"
22 #include "networkd-ipv6-proxy-ndp.h"
23 #include "networkd-lldp-tx.h"
24 #include "networkd-manager.h"
25 #include "networkd-ndisc.h"
26 #include "networkd-neighbor.h"
27 #include "networkd-radv.h"
28 #include "networkd-routing-policy-rule.h"
29 #include "set.h"
30 #include "socket-util.h"
31 #include "stdio-util.h"
32 #include "string-table.h"
33 #include "strv.h"
34 #include "sysctl-util.h"
35 #include "tmpfile-util.h"
36 #include "udev-util.h"
37 #include "util.h"
38 #include "virt.h"
39
40 uint32_t link_get_vrf_table(Link *link) {
41 return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
42 }
43
44 uint32_t link_get_dhcp_route_table(Link *link) {
45 /* When the interface is part of an VRF use the VRFs routing table, unless
46 * another table is explicitly specified. */
47 if (link->network->dhcp_route_table_set)
48 return link->network->dhcp_route_table;
49 return link_get_vrf_table(link);
50 }
51
52 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
53 if (link->network->ipv6_accept_ra_route_table_set)
54 return link->network->ipv6_accept_ra_route_table;
55 return link_get_vrf_table(link);
56 }
57
58 DUID* link_get_duid(Link *link) {
59 if (link->network->duid.type != _DUID_TYPE_INVALID)
60 return &link->network->duid;
61 else
62 return &link->manager->duid;
63 }
64
65 static bool link_dhcp6_enabled(Link *link) {
66 assert(link);
67
68 if (!socket_ipv6_is_supported())
69 return false;
70
71 if (link->flags & IFF_LOOPBACK)
72 return false;
73
74 if (!link->network)
75 return false;
76
77 if (link->network->bond)
78 return false;
79
80 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
81 return false;
82
83 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
84 return false;
85
86 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
87 }
88
89 static bool link_dhcp4_enabled(Link *link) {
90 assert(link);
91
92 if (link->flags & IFF_LOOPBACK)
93 return false;
94
95 if (!link->network)
96 return false;
97
98 if (link->network->bond)
99 return false;
100
101 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
102 return false;
103
104 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
105 }
106
107 static bool link_dhcp4_server_enabled(Link *link) {
108 assert(link);
109
110 if (link->flags & IFF_LOOPBACK)
111 return false;
112
113 if (!link->network)
114 return false;
115
116 if (link->network->bond)
117 return false;
118
119 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
120 return false;
121
122 return link->network->dhcp_server;
123 }
124
125 bool link_ipv4ll_enabled(Link *link) {
126 assert(link);
127
128 if (link->flags & IFF_LOOPBACK)
129 return false;
130
131 if (!link->network)
132 return false;
133
134 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "ip6gre", "ip6tnl", "sit", "vti", "vti6", "can", "vcan"))
135 return false;
136
137 /* L3 or L3S mode do not support ARP. */
138 if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S))
139 return false;
140
141 if (link->network->bond)
142 return false;
143
144 return link->network->link_local & ADDRESS_FAMILY_IPV4;
145 }
146
147 bool link_ipv4ll_fallback_enabled(Link *link) {
148 assert(link);
149
150 if (link->flags & IFF_LOOPBACK)
151 return false;
152
153 if (!link->network)
154 return false;
155
156 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "ip6gre", "ip6tnl", "sit", "vti", "vti6", "can", "vcan"))
157 return false;
158
159 /* L3 or L3S mode do not support ARP. */
160 if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S))
161 return false;
162
163 if (link->network->bond)
164 return false;
165
166 return link->network->link_local & ADDRESS_FAMILY_FALLBACK_IPV4;
167 }
168
169 static bool link_ipv6ll_enabled(Link *link) {
170 assert(link);
171
172 if (!socket_ipv6_is_supported())
173 return false;
174
175 if (link->flags & IFF_LOOPBACK)
176 return false;
177
178 if (!link->network)
179 return false;
180
181 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "sit", "vti", "can", "vcan"))
182 return false;
183
184 if (link->network->bond)
185 return false;
186
187 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
188 return false;
189
190 return link->network->link_local & ADDRESS_FAMILY_IPV6;
191 }
192
193 static bool link_ipv6_enabled(Link *link) {
194 assert(link);
195
196 if (!socket_ipv6_is_supported())
197 return false;
198
199 if (link->network->bond)
200 return false;
201
202 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
203 return false;
204
205 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
206 return false;
207
208 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
209 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
210 }
211
212 static bool link_radv_enabled(Link *link) {
213 assert(link);
214
215 if (!link_ipv6ll_enabled(link))
216 return false;
217
218 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
219 }
220
221 static bool link_ipv4_forward_enabled(Link *link) {
222 assert(link);
223
224 if (link->flags & IFF_LOOPBACK)
225 return false;
226
227 if (!link->network)
228 return false;
229
230 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
231 return false;
232
233 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
234 }
235
236 static bool link_ipv6_forward_enabled(Link *link) {
237 assert(link);
238
239 if (!socket_ipv6_is_supported())
240 return false;
241
242 if (link->flags & IFF_LOOPBACK)
243 return false;
244
245 if (!link->network)
246 return false;
247
248 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
249 return false;
250
251 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
252 return false;
253
254 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
255 }
256
257 static bool link_proxy_arp_enabled(Link *link) {
258 assert(link);
259
260 if (link->flags & IFF_LOOPBACK)
261 return false;
262
263 if (!link->network)
264 return false;
265
266 if (link->network->proxy_arp < 0)
267 return false;
268
269 return true;
270 }
271
272 static bool link_ipv6_accept_ra_enabled(Link *link) {
273 assert(link);
274
275 if (!socket_ipv6_is_supported())
276 return false;
277
278 if (link->flags & IFF_LOOPBACK)
279 return false;
280
281 if (!link->network)
282 return false;
283
284 if (!link_ipv6ll_enabled(link))
285 return false;
286
287 /* If unset use system default (enabled if local forwarding is disabled.
288 * disabled if local forwarding is enabled).
289 * If set, ignore or enforce RA independent of local forwarding state.
290 */
291 if (link->network->ipv6_accept_ra < 0)
292 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
293 return !link_ipv6_forward_enabled(link);
294 else if (link->network->ipv6_accept_ra > 0)
295 /* accept RA even if ip_forward is enabled */
296 return true;
297 else
298 /* ignore RA */
299 return false;
300 }
301
302 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
303 assert(link);
304
305 if (!socket_ipv6_is_supported())
306 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
307
308 if (link->flags & IFF_LOOPBACK)
309 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
310
311 if (!link->network)
312 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
313
314 return link->network->ipv6_privacy_extensions;
315 }
316
317 static int link_enable_ipv6(Link *link) {
318 bool disabled;
319 int r;
320
321 if (link->flags & IFF_LOOPBACK)
322 return 0;
323
324 disabled = !link_ipv6_enabled(link);
325
326 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", disabled);
327 if (r < 0)
328 log_link_warning_errno(link, r, "Cannot %s IPv6: %m", enable_disable(!disabled));
329 else
330 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
331
332 return 0;
333 }
334
335 static bool link_is_enslaved(Link *link) {
336 if (link->flags & IFF_SLAVE)
337 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
338 return true;
339
340 if (!link->network)
341 return false;
342
343 if (link->master_ifindex > 0 && link->network->bridge)
344 return true;
345
346 if (!link->enslaved_raw)
347 return false;
348
349 /* TODO: add conditions for other netdevs. */
350
351 return false;
352 }
353
354 static void link_update_master_operstate(Link *link, NetDev *netdev) {
355 Link *master;
356
357 if (!netdev)
358 return;
359
360 if (link_get(link->manager, netdev->ifindex, &master) < 0)
361 return;
362
363 link_update_operstate(master, true);
364 }
365
366 void link_update_operstate(Link *link, bool also_update_master) {
367 LinkOperationalState operstate;
368 Iterator i;
369
370 assert(link);
371
372 if (link->kernel_operstate == IF_OPER_DORMANT)
373 operstate = LINK_OPERSTATE_DORMANT;
374 else if (link_has_carrier(link)) {
375 Address *address;
376 uint8_t scope = RT_SCOPE_NOWHERE;
377
378 /* if we have carrier, check what addresses we have */
379 SET_FOREACH(address, link->addresses, i) {
380 if (!address_is_ready(address))
381 continue;
382
383 if (address->scope < scope)
384 scope = address->scope;
385 }
386
387 /* for operstate we also take foreign addresses into account */
388 SET_FOREACH(address, link->addresses_foreign, i) {
389 if (!address_is_ready(address))
390 continue;
391
392 if (address->scope < scope)
393 scope = address->scope;
394 }
395
396 if (scope < RT_SCOPE_SITE)
397 /* universally accessible addresses found */
398 operstate = LINK_OPERSTATE_ROUTABLE;
399 else if (scope < RT_SCOPE_HOST)
400 /* only link or site local addresses found */
401 operstate = LINK_OPERSTATE_DEGRADED;
402 else
403 /* no useful addresses found */
404 operstate = LINK_OPERSTATE_CARRIER;
405 } else if (link->flags & IFF_UP)
406 operstate = LINK_OPERSTATE_NO_CARRIER;
407 else
408 operstate = LINK_OPERSTATE_OFF;
409
410 if (IN_SET(operstate, LINK_OPERSTATE_DEGRADED, LINK_OPERSTATE_CARRIER) &&
411 link_is_enslaved(link))
412 operstate = LINK_OPERSTATE_ENSLAVED;
413
414 if (operstate >= LINK_OPERSTATE_CARRIER) {
415 Link *slave;
416
417 SET_FOREACH(slave, link->slaves, i) {
418 link_update_operstate(slave, false);
419
420 if (slave->operstate < LINK_OPERSTATE_CARRIER)
421 operstate = LINK_OPERSTATE_DEGRADED_CARRIER;
422 }
423 }
424
425 if (link->operstate != operstate) {
426 link->operstate = operstate;
427 link_send_changed(link, "OperationalState", NULL);
428 link_dirty(link);
429 }
430
431 if (also_update_master && link->network) {
432 link_update_master_operstate(link, link->network->bond);
433 link_update_master_operstate(link, link->network->bridge);
434 }
435 }
436
437 #define FLAG_STRING(string, flag, old, new) \
438 (((old ^ new) & flag) \
439 ? ((old & flag) ? (" -" string) : (" +" string)) \
440 : "")
441
442 static int link_update_flags(Link *link, sd_netlink_message *m, bool force_update_operstate) {
443 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
444 uint8_t operstate;
445 int r;
446
447 assert(link);
448
449 r = sd_rtnl_message_link_get_flags(m, &flags);
450 if (r < 0)
451 return log_link_warning_errno(link, r, "Could not get link flags: %m");
452
453 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
454 if (r < 0)
455 /* if we got a message without operstate, take it to mean
456 the state was unchanged */
457 operstate = link->kernel_operstate;
458
459 if (!force_update_operstate && (link->flags == flags) && (link->kernel_operstate == operstate))
460 return 0;
461
462 if (link->flags != flags) {
463 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",
464 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
465 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
466 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
467 FLAG_STRING("UP", IFF_UP, link->flags, flags),
468 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
469 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
470 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
471 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
472 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
473 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
474 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
475 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
476 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
477 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
478 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
479 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
480 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
481 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
482 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
483
484 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
485 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
486 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
487 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
488 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
489 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
490 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
491 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
492
493 /* link flags are currently at most 18 bits, let's align to
494 * printing 20 */
495 if (unknown_flags_added)
496 log_link_debug(link,
497 "Unknown link flags gained: %#.5x (ignoring)",
498 unknown_flags_added);
499
500 if (unknown_flags_removed)
501 log_link_debug(link,
502 "Unknown link flags lost: %#.5x (ignoring)",
503 unknown_flags_removed);
504 }
505
506 link->flags = flags;
507 link->kernel_operstate = operstate;
508
509 link_update_operstate(link, true);
510
511 return 0;
512 }
513
514 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
515 _cleanup_(link_unrefp) Link *link = NULL;
516 uint16_t type;
517 const char *ifname, *kind = NULL;
518 int r, ifindex;
519 unsigned short iftype;
520
521 assert(manager);
522 assert(message);
523 assert(ret);
524
525 /* check for link kind */
526 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
527 if (r == 0) {
528 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
529 r = sd_netlink_message_exit_container(message);
530 if (r < 0)
531 return r;
532 }
533
534 r = sd_netlink_message_get_type(message, &type);
535 if (r < 0)
536 return r;
537 else if (type != RTM_NEWLINK)
538 return -EINVAL;
539
540 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
541 if (r < 0)
542 return r;
543 else if (ifindex <= 0)
544 return -EINVAL;
545
546 r = sd_rtnl_message_link_get_type(message, &iftype);
547 if (r < 0)
548 return r;
549
550 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
551 if (r < 0)
552 return r;
553
554 link = new(Link, 1);
555 if (!link)
556 return -ENOMEM;
557
558 *link = (Link) {
559 .n_ref = 1,
560 .manager = manager,
561 .state = LINK_STATE_PENDING,
562 .rtnl_extended_attrs = true,
563 .ifindex = ifindex,
564 .iftype = iftype,
565 };
566
567 link->ifname = strdup(ifname);
568 if (!link->ifname)
569 return -ENOMEM;
570
571 if (kind) {
572 link->kind = strdup(kind);
573 if (!link->kind)
574 return -ENOMEM;
575 }
576
577 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
578 if (r < 0)
579 log_link_debug_errno(link, r, "New device has no master, continuing without");
580
581 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
582 if (r < 0)
583 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
584
585 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
586 return -ENOMEM;
587
588 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
589 return -ENOMEM;
590
591 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
592 return -ENOMEM;
593
594 r = hashmap_ensure_allocated(&manager->links, NULL);
595 if (r < 0)
596 return r;
597
598 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
599 if (r < 0)
600 return r;
601
602 r = link_update_flags(link, message, false);
603 if (r < 0)
604 return r;
605
606 *ret = TAKE_PTR(link);
607
608 return 0;
609 }
610
611 static Link *link_free(Link *link) {
612 Address *address;
613
614 assert(link);
615
616 link->routes = set_free_with_destructor(link->routes, route_free);
617 link->routes_foreign = set_free_with_destructor(link->routes_foreign, route_free);
618
619 link->addresses = set_free_with_destructor(link->addresses, address_free);
620 link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free);
621
622 while ((address = link->pool_addresses)) {
623 LIST_REMOVE(addresses, link->pool_addresses, address);
624 address_free(address);
625 }
626
627 sd_dhcp_server_unref(link->dhcp_server);
628 sd_dhcp_client_unref(link->dhcp_client);
629 sd_dhcp_lease_unref(link->dhcp_lease);
630
631 link_lldp_emit_stop(link);
632
633 free(link->lease_file);
634
635 sd_lldp_unref(link->lldp);
636 free(link->lldp_file);
637
638 ndisc_flush(link);
639
640 sd_ipv4ll_unref(link->ipv4ll);
641 sd_dhcp6_client_unref(link->dhcp6_client);
642 sd_ndisc_unref(link->ndisc);
643 sd_radv_unref(link->radv);
644
645 free(link->ifname);
646 free(link->kind);
647
648 (void) unlink(link->state_file);
649 free(link->state_file);
650
651 sd_device_unref(link->sd_device);
652
653 hashmap_free(link->bound_to_links);
654 hashmap_free(link->bound_by_links);
655
656 set_free_with_destructor(link->slaves, link_unref);
657
658 network_unref(link->network);
659
660 return mfree(link);
661 }
662
663 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
664
665 int link_get(Manager *m, int ifindex, Link **ret) {
666 Link *link;
667
668 assert(m);
669 assert(ifindex);
670 assert(ret);
671
672 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
673 if (!link)
674 return -ENODEV;
675
676 *ret = link;
677
678 return 0;
679 }
680
681 void link_set_state(Link *link, LinkState state) {
682 assert(link);
683
684 if (link->state == state)
685 return;
686
687 log_link_debug(link, "State changed: %s -> %s",
688 link_state_to_string(link->state),
689 link_state_to_string(state));
690
691 link->state = state;
692
693 link_send_changed(link, "AdministrativeState", NULL);
694 }
695
696 static void link_enter_unmanaged(Link *link) {
697 assert(link);
698
699 link_set_state(link, LINK_STATE_UNMANAGED);
700
701 link_dirty(link);
702 }
703
704 int link_stop_clients(Link *link) {
705 int r = 0, k;
706
707 assert(link);
708 assert(link->manager);
709 assert(link->manager->event);
710
711 if (link->dhcp_client) {
712 k = sd_dhcp_client_stop(link->dhcp_client);
713 if (k < 0)
714 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
715 }
716
717 if (link->ipv4ll) {
718 k = sd_ipv4ll_stop(link->ipv4ll);
719 if (k < 0)
720 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
721 }
722
723 if (link->dhcp6_client) {
724 k = sd_dhcp6_client_stop(link->dhcp6_client);
725 if (k < 0)
726 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
727 }
728
729 if (link->ndisc) {
730 k = sd_ndisc_stop(link->ndisc);
731 if (k < 0)
732 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
733 }
734
735 if (link->radv) {
736 k = sd_radv_stop(link->radv);
737 if (k < 0)
738 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
739 }
740
741 link_lldp_emit_stop(link);
742 return r;
743 }
744
745 void link_enter_failed(Link *link) {
746 assert(link);
747
748 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
749 return;
750
751 log_link_warning(link, "Failed");
752
753 link_set_state(link, LINK_STATE_FAILED);
754
755 link_stop_clients(link);
756
757 link_dirty(link);
758 }
759
760 static Address* link_find_dhcp_server_address(Link *link) {
761 Address *address;
762
763 assert(link);
764 assert(link->network);
765
766 /* The first statically configured address if there is any */
767 LIST_FOREACH(addresses, address, link->network->static_addresses) {
768
769 if (address->family != AF_INET)
770 continue;
771
772 if (in_addr_is_null(address->family, &address->in_addr))
773 continue;
774
775 return address;
776 }
777
778 /* If that didn't work, find a suitable address we got from the pool */
779 LIST_FOREACH(addresses, address, link->pool_addresses) {
780 if (address->family != AF_INET)
781 continue;
782
783 return address;
784 }
785
786 return NULL;
787 }
788
789 static int link_join_netdevs_after_configured(Link *link) {
790 NetDev *netdev;
791 Iterator i;
792 int r;
793
794 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
795 if (netdev->ifindex > 0)
796 /* Assume already enslaved. */
797 continue;
798
799 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
800 continue;
801
802 log_struct(LOG_DEBUG,
803 LOG_LINK_INTERFACE(link),
804 LOG_NETDEV_INTERFACE(netdev),
805 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
806
807 r = netdev_join(netdev, link, NULL);
808 if (r < 0)
809 return log_struct_errno(LOG_WARNING, r,
810 LOG_LINK_INTERFACE(link),
811 LOG_NETDEV_INTERFACE(netdev),
812 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
813 }
814
815 return 0;
816 }
817
818 static void link_enter_configured(Link *link) {
819 assert(link);
820 assert(link->network);
821
822 if (link->state != LINK_STATE_CONFIGURING)
823 return;
824
825 log_link_info(link, "Configured");
826
827 link_set_state(link, LINK_STATE_CONFIGURED);
828
829 (void) link_join_netdevs_after_configured(link);
830
831 link_dirty(link);
832 }
833
834 static int link_request_set_routing_policy_rule(Link *link) {
835 RoutingPolicyRule *rule, *rrule = NULL;
836 int r;
837
838 assert(link);
839 assert(link->network);
840
841 link_set_state(link, LINK_STATE_CONFIGURING);
842 link->routing_policy_rules_configured = false;
843
844 LIST_FOREACH(rules, rule, link->network->rules) {
845 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
846 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif,
847 rule->protocol, &rule->sport, &rule->dport, &rrule);
848 if (r == 0) {
849 (void) routing_policy_rule_make_local(link->manager, rrule);
850 continue;
851 }
852
853 r = routing_policy_rule_configure(rule, link, NULL, false);
854 if (r < 0) {
855 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
856 link_enter_failed(link);
857 return r;
858 }
859
860 link->routing_policy_rule_messages++;
861 }
862
863 routing_policy_rule_purge(link->manager, link);
864 if (link->routing_policy_rule_messages == 0) {
865 link->routing_policy_rules_configured = true;
866 link_check_ready(link);
867 } else
868 log_link_debug(link, "Setting routing policy rules");
869
870 return 0;
871 }
872
873 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
874 int r;
875
876 assert(link);
877 assert(link->route_messages > 0);
878 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
879 LINK_STATE_FAILED, LINK_STATE_LINGER));
880
881 link->route_messages--;
882
883 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
884 return 1;
885
886 r = sd_netlink_message_get_errno(m);
887 if (r < 0 && r != -EEXIST)
888 log_link_warning_errno(link, r, "Could not set route: %m");
889
890 if (link->route_messages == 0) {
891 log_link_debug(link, "Routes set");
892 link->static_routes_configured = true;
893 link_check_ready(link);
894 }
895
896 return 1;
897 }
898
899 int link_request_set_routes(Link *link) {
900 enum {
901 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
902 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
903 _PHASE_MAX
904 } phase;
905 Route *rt;
906 int r;
907
908 assert(link);
909 assert(link->network);
910 assert(link->addresses_configured);
911 assert(link->address_messages == 0);
912 assert(link->state != _LINK_STATE_INVALID);
913
914 link_set_state(link, LINK_STATE_CONFIGURING);
915 link->static_routes_configured = false;
916
917 r = link_request_set_routing_policy_rule(link);
918 if (r < 0)
919 return r;
920
921 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
922 for (phase = 0; phase < _PHASE_MAX; phase++)
923 LIST_FOREACH(routes, rt, link->network->static_routes) {
924
925 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
926 continue;
927
928 r = route_configure(rt, link, route_handler);
929 if (r < 0) {
930 log_link_warning_errno(link, r, "Could not set routes: %m");
931 link_enter_failed(link);
932 return r;
933 }
934
935 link->route_messages++;
936 }
937
938 if (link->route_messages == 0) {
939 link->static_routes_configured = true;
940 link_check_ready(link);
941 } else
942 log_link_debug(link, "Setting routes");
943
944 return 0;
945 }
946
947 void link_check_ready(Link *link) {
948 Address *a;
949 Iterator i;
950
951 assert(link);
952
953 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
954 return;
955
956 if (!link->network)
957 return;
958
959 if (!link->addresses_configured)
960 return;
961
962 if (!link->neighbors_configured)
963 return;
964
965 SET_FOREACH(a, link->addresses, i)
966 if (!address_is_ready(a))
967 return;
968
969 if (!link->addresses_ready) {
970 link->addresses_ready = true;
971 link_request_set_routes(link);
972 return;
973 }
974
975 if (!link->static_routes_configured)
976 return;
977
978 if (!link->routing_policy_rules_configured)
979 return;
980
981 if (link_ipv4ll_enabled(link) && !(link->ipv4ll_address && link->ipv4ll_route))
982 return;
983
984 if (link_ipv6ll_enabled(link) &&
985 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
986 return;
987
988 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
989 !(link->dhcp4_configured || link->dhcp6_configured) &&
990 !(link_ipv4ll_fallback_enabled(link) && link->ipv4ll_address && link->ipv4ll_route))
991 /* When DHCP is enabled, at least one protocol must provide an address, or
992 * an IPv4ll fallback address must be configured. */
993 return;
994
995 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
996 return;
997
998 if (link->state != LINK_STATE_CONFIGURED)
999 link_enter_configured(link);
1000
1001 return;
1002 }
1003
1004 static int link_request_set_neighbors(Link *link) {
1005 Neighbor *neighbor;
1006 int r;
1007
1008 assert(link);
1009 assert(link->network);
1010 assert(link->state != _LINK_STATE_INVALID);
1011
1012 link_set_state(link, LINK_STATE_CONFIGURING);
1013 link->neighbors_configured = false;
1014
1015 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1016 r = neighbor_configure(neighbor, link, NULL);
1017 if (r < 0) {
1018 log_link_warning_errno(link, r, "Could not set neighbor: %m");
1019 link_enter_failed(link);
1020 return r;
1021 }
1022 }
1023
1024 if (link->neighbor_messages == 0) {
1025 link->neighbors_configured = true;
1026 link_check_ready(link);
1027 } else
1028 log_link_debug(link, "Setting neighbors");
1029
1030 return 0;
1031 }
1032
1033 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1034 int r;
1035
1036 assert(rtnl);
1037 assert(m);
1038 assert(link);
1039 assert(link->ifname);
1040 assert(link->address_messages > 0);
1041 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1042 LINK_STATE_FAILED, LINK_STATE_LINGER));
1043
1044 link->address_messages--;
1045
1046 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1047 return 1;
1048
1049 r = sd_netlink_message_get_errno(m);
1050 if (r < 0 && r != -EEXIST)
1051 log_link_warning_errno(link, r, "could not set address: %m");
1052 else if (r >= 0)
1053 manager_rtnl_process_address(rtnl, m, link->manager);
1054
1055 if (link->address_messages == 0) {
1056 log_link_debug(link, "Addresses set");
1057 link->addresses_configured = true;
1058 link_check_ready(link);
1059 }
1060
1061 return 1;
1062 }
1063
1064 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1065 _cleanup_free_ struct in_addr *addresses = NULL;
1066 size_t n_addresses = 0, n_allocated = 0;
1067 unsigned i;
1068
1069 log_debug("Copying DNS server information from %s", link->ifname);
1070
1071 if (!link->network)
1072 return 0;
1073
1074 for (i = 0; i < link->network->n_dns; i++) {
1075 struct in_addr ia;
1076
1077 /* Only look for IPv4 addresses */
1078 if (link->network->dns[i].family != AF_INET)
1079 continue;
1080
1081 ia = link->network->dns[i].address.in;
1082
1083 /* Never propagate obviously borked data */
1084 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1085 continue;
1086
1087 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1088 return log_oom();
1089
1090 addresses[n_addresses++] = ia;
1091 }
1092
1093 if (link->network->dhcp_use_dns && link->dhcp_lease) {
1094 const struct in_addr *da = NULL;
1095 int j, n;
1096
1097 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
1098 if (n > 0) {
1099
1100 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1101 return log_oom();
1102
1103 for (j = 0; j < n; j++)
1104 if (in4_addr_is_non_local(&da[j]))
1105 addresses[n_addresses++] = da[j];
1106 }
1107 }
1108
1109 if (n_addresses <= 0)
1110 return 0;
1111
1112 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
1113 }
1114
1115 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1116 _cleanup_free_ struct in_addr *addresses = NULL;
1117 size_t n_addresses = 0, n_allocated = 0;
1118 char **a;
1119
1120 if (!link->network)
1121 return 0;
1122
1123 log_debug("Copying NTP server information from %s", link->ifname);
1124
1125 STRV_FOREACH(a, link->network->ntp) {
1126 union in_addr_union ia;
1127
1128 /* Only look for IPv4 addresses */
1129 if (in_addr_from_string(AF_INET, *a, &ia) <= 0)
1130 continue;
1131
1132 /* Never propagate obviously borked data */
1133 if (in4_addr_is_null(&ia.in) || in4_addr_is_localhost(&ia.in))
1134 continue;
1135
1136 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1137 return log_oom();
1138
1139 addresses[n_addresses++] = ia.in;
1140 }
1141
1142 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1143 const struct in_addr *da = NULL;
1144 int j, n;
1145
1146 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1147 if (n > 0) {
1148
1149 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1150 return log_oom();
1151
1152 for (j = 0; j < n; j++)
1153 if (in4_addr_is_non_local(&da[j]))
1154 addresses[n_addresses++] = da[j];
1155 }
1156 }
1157
1158 if (n_addresses <= 0)
1159 return 0;
1160
1161 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1162 }
1163
1164 static int link_set_bridge_fdb(Link *link) {
1165 FdbEntry *fdb_entry;
1166 int r;
1167
1168 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1169 r = fdb_entry_configure(link, fdb_entry);
1170 if (r < 0)
1171 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1172 }
1173
1174 return 0;
1175 }
1176
1177 static int link_request_set_addresses(Link *link) {
1178 AddressLabel *label;
1179 Address *ad;
1180 int r;
1181
1182 assert(link);
1183 assert(link->network);
1184 assert(link->state != _LINK_STATE_INVALID);
1185
1186 link_set_state(link, LINK_STATE_CONFIGURING);
1187
1188 /* Reset all *_configured flags we are configuring. */
1189 link->addresses_configured = false;
1190 link->addresses_ready = false;
1191 link->neighbors_configured = false;
1192 link->static_routes_configured = false;
1193 link->routing_policy_rules_configured = false;
1194
1195 r = link_set_bridge_fdb(link);
1196 if (r < 0)
1197 return r;
1198
1199 r = link_request_set_neighbors(link);
1200 if (r < 0)
1201 return r;
1202
1203 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1204 bool update;
1205
1206 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1207
1208 r = address_configure(ad, link, address_handler, update);
1209 if (r < 0) {
1210 log_link_warning_errno(link, r, "Could not set addresses: %m");
1211 link_enter_failed(link);
1212 return r;
1213 }
1214
1215 link->address_messages++;
1216 }
1217
1218 LIST_FOREACH(labels, label, link->network->address_labels) {
1219 r = address_label_configure(label, link, NULL, false);
1220 if (r < 0) {
1221 log_link_warning_errno(link, r, "Could not set address label: %m");
1222 link_enter_failed(link);
1223 return r;
1224 }
1225
1226 link->address_label_messages++;
1227 }
1228
1229 /* now that we can figure out a default address for the dhcp server,
1230 start it */
1231 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1232 Address *address;
1233 Link *uplink = NULL;
1234 bool acquired_uplink = false;
1235
1236 address = link_find_dhcp_server_address(link);
1237 if (!address) {
1238 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1239 link_enter_failed(link);
1240 return 0;
1241 }
1242
1243 /* use the server address' subnet as the pool */
1244 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1245 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1246 if (r < 0)
1247 return r;
1248
1249 /* TODO:
1250 r = sd_dhcp_server_set_router(link->dhcp_server,
1251 &main_address->in_addr.in);
1252 if (r < 0)
1253 return r;
1254 */
1255
1256 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1257 r = sd_dhcp_server_set_max_lease_time(
1258 link->dhcp_server,
1259 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1260 if (r < 0)
1261 return r;
1262 }
1263
1264 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1265 r = sd_dhcp_server_set_default_lease_time(
1266 link->dhcp_server,
1267 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1268 if (r < 0)
1269 return r;
1270 }
1271
1272 if (link->network->dhcp_server_emit_dns) {
1273
1274 if (link->network->n_dhcp_server_dns > 0)
1275 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1276 else {
1277 uplink = manager_find_uplink(link->manager, link);
1278 acquired_uplink = true;
1279
1280 if (!uplink) {
1281 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1282 r = 0;
1283 } else
1284 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1285 }
1286 if (r < 0)
1287 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1288 }
1289
1290 if (link->network->dhcp_server_emit_ntp) {
1291
1292 if (link->network->n_dhcp_server_ntp > 0)
1293 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1294 else {
1295 if (!acquired_uplink)
1296 uplink = manager_find_uplink(link->manager, link);
1297
1298 if (!uplink) {
1299 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1300 r = 0;
1301 } else
1302 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1303
1304 }
1305 if (r < 0)
1306 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1307 }
1308
1309 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1310 if (r < 0)
1311 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1312
1313 if (link->network->dhcp_server_emit_timezone) {
1314 _cleanup_free_ char *buffer = NULL;
1315 const char *tz = NULL;
1316
1317 if (link->network->dhcp_server_timezone)
1318 tz = link->network->dhcp_server_timezone;
1319 else {
1320 r = get_timezone(&buffer);
1321 if (r < 0)
1322 log_warning_errno(r, "Failed to determine timezone: %m");
1323 else
1324 tz = buffer;
1325 }
1326
1327 if (tz) {
1328 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1329 if (r < 0)
1330 return r;
1331 }
1332 }
1333 if (!sd_dhcp_server_is_running(link->dhcp_server)) {
1334 r = sd_dhcp_server_start(link->dhcp_server);
1335 if (r < 0) {
1336 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1337
1338 link_enter_failed(link);
1339
1340 return 0;
1341 }
1342 }
1343
1344 log_link_debug(link, "Offering DHCPv4 leases");
1345 }
1346
1347 if (link->address_messages == 0) {
1348 link->addresses_configured = true;
1349 link_check_ready(link);
1350 } else
1351 log_link_debug(link, "Setting addresses");
1352
1353 return 0;
1354 }
1355
1356 static int link_set_bridge_vlan(Link *link) {
1357 int r;
1358
1359 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1360 if (r < 0)
1361 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1362
1363 return r;
1364 }
1365
1366 static int link_set_proxy_arp(Link *link) {
1367 int r;
1368
1369 if (!link_proxy_arp_enabled(link))
1370 return 0;
1371
1372 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1373 if (r < 0)
1374 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1375
1376 return 0;
1377 }
1378
1379 static int link_configure_after_setting_mtu(Link *link);
1380
1381 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1382 int r;
1383
1384 assert(m);
1385 assert(link);
1386 assert(link->ifname);
1387
1388 link->setting_mtu = false;
1389
1390 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1391 return 1;
1392
1393 r = sd_netlink_message_get_errno(m);
1394 if (r < 0) {
1395 log_link_warning_errno(link, r, "Could not set MTU: %m");
1396 return 1;
1397 }
1398
1399 log_link_debug(link, "Setting MTU done.");
1400
1401 if (link->state == LINK_STATE_INITIALIZED)
1402 (void) link_configure_after_setting_mtu(link);
1403
1404 return 1;
1405 }
1406
1407 int link_set_mtu(Link *link, uint32_t mtu) {
1408 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1409 int r;
1410
1411 assert(link);
1412 assert(link->manager);
1413 assert(link->manager->rtnl);
1414
1415 if (mtu == 0 || link->setting_mtu)
1416 return 0;
1417
1418 if (link->mtu == mtu)
1419 return 0;
1420
1421 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1422
1423 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1424 if (r < 0)
1425 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1426
1427 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1428 * for this interface, then disable IPv6 else enable it. */
1429 (void) link_enable_ipv6(link);
1430
1431 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1432 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1433 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1434
1435 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1436 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1437
1438 mtu = IPV6_MIN_MTU;
1439 }
1440
1441 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1442 if (r < 0)
1443 return log_link_error_errno(link, r, "Could not append MTU: %m");
1444
1445 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1446 link_netlink_destroy_callback, link);
1447 if (r < 0)
1448 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1449
1450 link_ref(link);
1451 link->setting_mtu = true;
1452
1453 return 0;
1454 }
1455
1456 static bool link_reduces_vlan_mtu(Link *link) {
1457 /* See netif_reduces_vlan_mtu() in kernel. */
1458 return streq_ptr(link->kind, "macsec");
1459 }
1460
1461 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1462 uint32_t mtu = 0;
1463 NetDev *dev;
1464 Iterator i;
1465
1466 HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1467 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1468 /* See vlan_dev_change_mtu() in kernel. */
1469 mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1470
1471 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1472 /* See macvlan_change_mtu() in kernel. */
1473 mtu = dev->mtu;
1474
1475 return mtu;
1476 }
1477
1478 static int link_configure_mtu(Link *link) {
1479 uint32_t mtu;
1480
1481 assert(link);
1482 assert(link->network);
1483
1484 if (link->network->mtu > 0)
1485 return link_set_mtu(link, link->network->mtu);
1486
1487 mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1488 if (link->mtu >= mtu)
1489 return 0;
1490
1491 log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1492 "If it is not desired, then please explicitly specify MTUBytes= setting.",
1493 link->mtu, mtu);
1494
1495 return link_set_mtu(link, mtu);
1496 }
1497
1498 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1499 int r;
1500
1501 assert(m);
1502 assert(link);
1503 assert(link->ifname);
1504
1505 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1506 return 1;
1507
1508 r = sd_netlink_message_get_errno(m);
1509 if (r < 0)
1510 log_link_warning_errno(link, r, "Could not set link flags: %m");
1511
1512 return 1;
1513 }
1514
1515 static int link_set_flags(Link *link) {
1516 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1517 unsigned ifi_change = 0;
1518 unsigned ifi_flags = 0;
1519 int r;
1520
1521 assert(link);
1522 assert(link->manager);
1523 assert(link->manager->rtnl);
1524
1525 if (link->flags & IFF_LOOPBACK)
1526 return 0;
1527
1528 if (!link->network)
1529 return 0;
1530
1531 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1532 return 0;
1533
1534 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1535 if (r < 0)
1536 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1537
1538 if (link->network->arp >= 0) {
1539 ifi_change |= IFF_NOARP;
1540 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1541 }
1542
1543 if (link->network->multicast >= 0) {
1544 ifi_change |= IFF_MULTICAST;
1545 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1546 }
1547
1548 if (link->network->allmulticast >= 0) {
1549 ifi_change |= IFF_ALLMULTI;
1550 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1551 }
1552
1553 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1554 if (r < 0)
1555 return log_link_error_errno(link, r, "Could not set link flags: %m");
1556
1557 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1558 link_netlink_destroy_callback, link);
1559 if (r < 0)
1560 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1561
1562 link_ref(link);
1563
1564 return 0;
1565 }
1566
1567 static int link_acquire_ipv6_conf(Link *link) {
1568 int r;
1569
1570 assert(link);
1571
1572 if (link_ipv6_accept_ra_enabled(link)) {
1573 assert(link->ndisc);
1574
1575 log_link_debug(link, "Discovering IPv6 routers");
1576
1577 r = sd_ndisc_start(link->ndisc);
1578 if (r < 0 && r != -EBUSY)
1579 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1580 }
1581
1582 if (link_radv_enabled(link)) {
1583 assert(link->radv);
1584 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1585
1586 log_link_debug(link, "Starting IPv6 Router Advertisements");
1587
1588 r = sd_radv_start(link->radv);
1589 if (r < 0 && r != -EBUSY)
1590 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1591 }
1592
1593 (void) dhcp6_request_prefix_delegation(link);
1594
1595 return 0;
1596 }
1597
1598 static int link_acquire_ipv4_conf(Link *link) {
1599 int r;
1600
1601 assert(link);
1602 assert(link->manager);
1603 assert(link->manager->event);
1604
1605 if (link_ipv4ll_enabled(link)) {
1606 assert(link->ipv4ll);
1607
1608 log_link_debug(link, "Acquiring IPv4 link-local address");
1609
1610 r = sd_ipv4ll_start(link->ipv4ll);
1611 if (r < 0)
1612 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1613 }
1614
1615 if (link_dhcp4_enabled(link)) {
1616 assert(link->dhcp_client);
1617
1618 log_link_debug(link, "Acquiring DHCPv4 lease");
1619
1620 r = sd_dhcp_client_start(link->dhcp_client);
1621 if (r < 0)
1622 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1623 }
1624
1625 return 0;
1626 }
1627
1628 static int link_acquire_conf(Link *link) {
1629 int r;
1630
1631 assert(link);
1632
1633 r = link_acquire_ipv4_conf(link);
1634 if (r < 0)
1635 return r;
1636
1637 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1638 r = link_acquire_ipv6_conf(link);
1639 if (r < 0)
1640 return r;
1641 }
1642
1643 if (link_lldp_emit_enabled(link)) {
1644 r = link_lldp_emit_start(link);
1645 if (r < 0)
1646 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1647 }
1648
1649 return 0;
1650 }
1651
1652 bool link_has_carrier(Link *link) {
1653 /* see Documentation/networking/operstates.txt in the kernel sources */
1654
1655 if (link->kernel_operstate == IF_OPER_UP)
1656 return true;
1657
1658 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1659 /* operstate may not be implemented, so fall back to flags */
1660 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1661 !FLAGS_SET(link->flags, IFF_DORMANT))
1662 return true;
1663
1664 return false;
1665 }
1666
1667 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1668 int r;
1669
1670 assert(link);
1671
1672 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1673 return 1;
1674
1675 r = sd_netlink_message_get_errno(m);
1676 if (r < 0)
1677 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1678
1679 return 1;
1680 }
1681
1682 static int link_configure_addrgen_mode(Link *link) {
1683 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1684 uint8_t ipv6ll_mode;
1685 int r;
1686
1687 assert(link);
1688 assert(link->network);
1689 assert(link->manager);
1690 assert(link->manager->rtnl);
1691
1692 if (!socket_ipv6_is_supported())
1693 return 0;
1694
1695 log_link_debug(link, "Setting address genmode for link");
1696
1697 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1698 if (r < 0)
1699 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1700
1701 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1702 if (r < 0)
1703 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1704
1705 r = sd_netlink_message_open_container(req, AF_INET6);
1706 if (r < 0)
1707 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1708
1709 if (!link_ipv6ll_enabled(link))
1710 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1711 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1712 /* The file may not exist. And event if it exists, when stable_secret is unset,
1713 * reading the file fails with EIO. */
1714 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1715 else
1716 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1717
1718 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1719 if (r < 0)
1720 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1721
1722 r = sd_netlink_message_close_container(req);
1723 if (r < 0)
1724 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1725
1726 r = sd_netlink_message_close_container(req);
1727 if (r < 0)
1728 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1729
1730 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1731 link_netlink_destroy_callback, link);
1732 if (r < 0)
1733 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1734
1735 link_ref(link);
1736
1737 return 0;
1738 }
1739
1740 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1741 int r;
1742
1743 assert(link);
1744
1745 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1746 return 1;
1747
1748 r = sd_netlink_message_get_errno(m);
1749 if (r < 0)
1750 /* we warn but don't fail the link, as it may be brought up later */
1751 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1752
1753 return 1;
1754 }
1755
1756 static int link_up(Link *link) {
1757 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1758 int r;
1759
1760 assert(link);
1761 assert(link->network);
1762 assert(link->manager);
1763 assert(link->manager->rtnl);
1764
1765 log_link_debug(link, "Bringing link up");
1766
1767 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1768 if (r < 0)
1769 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1770
1771 /* set it free if not enslaved with networkd */
1772 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1773 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1774 if (r < 0)
1775 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1776 }
1777
1778 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1779 if (r < 0)
1780 return log_link_error_errno(link, r, "Could not set link flags: %m");
1781
1782 if (link->network->mac) {
1783 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1784 if (r < 0)
1785 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1786 }
1787
1788 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1789 link_netlink_destroy_callback, link);
1790 if (r < 0)
1791 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1792
1793 link_ref(link);
1794
1795 return 0;
1796 }
1797
1798 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1799 int r;
1800
1801 assert(link);
1802
1803 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1804 return 1;
1805
1806 r = sd_netlink_message_get_errno(m);
1807 if (r < 0)
1808 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1809
1810 return 1;
1811 }
1812
1813 int link_down(Link *link, link_netlink_message_handler_t callback) {
1814 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1815 int r;
1816
1817 assert(link);
1818 assert(link->manager);
1819 assert(link->manager->rtnl);
1820
1821 log_link_debug(link, "Bringing link down");
1822
1823 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1824 RTM_SETLINK, link->ifindex);
1825 if (r < 0)
1826 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1827
1828 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1829 if (r < 0)
1830 return log_link_error_errno(link, r, "Could not set link flags: %m");
1831
1832 r = netlink_call_async(link->manager->rtnl, NULL, req,
1833 callback ?: link_down_handler,
1834 link_netlink_destroy_callback, link);
1835 if (r < 0)
1836 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1837
1838 link_ref(link);
1839
1840 return 0;
1841 }
1842
1843 static int link_handle_bound_to_list(Link *link) {
1844 Link *l;
1845 Iterator i;
1846 int r;
1847 bool required_up = false;
1848 bool link_is_up = false;
1849
1850 assert(link);
1851
1852 if (hashmap_isempty(link->bound_to_links))
1853 return 0;
1854
1855 if (link->flags & IFF_UP)
1856 link_is_up = true;
1857
1858 HASHMAP_FOREACH (l, link->bound_to_links, i)
1859 if (link_has_carrier(l)) {
1860 required_up = true;
1861 break;
1862 }
1863
1864 if (!required_up && link_is_up) {
1865 r = link_down(link, NULL);
1866 if (r < 0)
1867 return r;
1868 } else if (required_up && !link_is_up) {
1869 r = link_up(link);
1870 if (r < 0)
1871 return r;
1872 }
1873
1874 return 0;
1875 }
1876
1877 static int link_handle_bound_by_list(Link *link) {
1878 Iterator i;
1879 Link *l;
1880 int r;
1881
1882 assert(link);
1883
1884 if (hashmap_isempty(link->bound_by_links))
1885 return 0;
1886
1887 HASHMAP_FOREACH (l, link->bound_by_links, i) {
1888 r = link_handle_bound_to_list(l);
1889 if (r < 0)
1890 return r;
1891 }
1892
1893 return 0;
1894 }
1895
1896 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1897 int r;
1898
1899 assert(link);
1900 assert(carrier);
1901
1902 if (link == carrier)
1903 return 0;
1904
1905 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1906 return 0;
1907
1908 r = hashmap_ensure_allocated(h, NULL);
1909 if (r < 0)
1910 return r;
1911
1912 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1913 if (r < 0)
1914 return r;
1915
1916 return 0;
1917 }
1918
1919 static int link_new_bound_by_list(Link *link) {
1920 Manager *m;
1921 Link *carrier;
1922 Iterator i;
1923 int r;
1924 bool list_updated = false;
1925
1926 assert(link);
1927 assert(link->manager);
1928
1929 m = link->manager;
1930
1931 HASHMAP_FOREACH(carrier, m->links, i) {
1932 if (!carrier->network)
1933 continue;
1934
1935 if (strv_isempty(carrier->network->bind_carrier))
1936 continue;
1937
1938 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
1939 r = link_put_carrier(link, carrier, &link->bound_by_links);
1940 if (r < 0)
1941 return r;
1942
1943 list_updated = true;
1944 }
1945 }
1946
1947 if (list_updated)
1948 link_dirty(link);
1949
1950 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
1951 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1952 if (r < 0)
1953 return r;
1954
1955 link_dirty(carrier);
1956 }
1957
1958 return 0;
1959 }
1960
1961 static int link_new_bound_to_list(Link *link) {
1962 Manager *m;
1963 Link *carrier;
1964 Iterator i;
1965 int r;
1966 bool list_updated = false;
1967
1968 assert(link);
1969 assert(link->manager);
1970
1971 if (!link->network)
1972 return 0;
1973
1974 if (strv_isempty(link->network->bind_carrier))
1975 return 0;
1976
1977 m = link->manager;
1978
1979 HASHMAP_FOREACH (carrier, m->links, i) {
1980 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
1981 r = link_put_carrier(link, carrier, &link->bound_to_links);
1982 if (r < 0)
1983 return r;
1984
1985 list_updated = true;
1986 }
1987 }
1988
1989 if (list_updated)
1990 link_dirty(link);
1991
1992 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
1993 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
1994 if (r < 0)
1995 return r;
1996
1997 link_dirty(carrier);
1998 }
1999
2000 return 0;
2001 }
2002
2003 static int link_new_carrier_maps(Link *link) {
2004 int r;
2005
2006 r = link_new_bound_by_list(link);
2007 if (r < 0)
2008 return r;
2009
2010 r = link_handle_bound_by_list(link);
2011 if (r < 0)
2012 return r;
2013
2014 r = link_new_bound_to_list(link);
2015 if (r < 0)
2016 return r;
2017
2018 r = link_handle_bound_to_list(link);
2019 if (r < 0)
2020 return r;
2021
2022 return 0;
2023 }
2024
2025 static void link_free_bound_to_list(Link *link) {
2026 Link *bound_to;
2027 Iterator i;
2028
2029 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2030 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2031
2032 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2033 link_dirty(bound_to);
2034 }
2035
2036 return;
2037 }
2038
2039 static void link_free_bound_by_list(Link *link) {
2040 Link *bound_by;
2041 Iterator i;
2042
2043 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2044 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2045
2046 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2047 link_dirty(bound_by);
2048 link_handle_bound_to_list(bound_by);
2049 }
2050 }
2051
2052 return;
2053 }
2054
2055 static void link_free_carrier_maps(Link *link) {
2056 bool list_updated = false;
2057
2058 assert(link);
2059
2060 if (!hashmap_isempty(link->bound_to_links)) {
2061 link_free_bound_to_list(link);
2062 list_updated = true;
2063 }
2064
2065 if (!hashmap_isempty(link->bound_by_links)) {
2066 link_free_bound_by_list(link);
2067 list_updated = true;
2068 }
2069
2070 if (list_updated)
2071 link_dirty(link);
2072
2073 return;
2074 }
2075
2076 static int link_append_to_master(Link *link, NetDev *netdev) {
2077 Link *master;
2078 int r;
2079
2080 assert(link);
2081 assert(netdev);
2082
2083 r = link_get(link->manager, netdev->ifindex, &master);
2084 if (r < 0)
2085 return r;
2086
2087 r = set_ensure_allocated(&master->slaves, NULL);
2088 if (r < 0)
2089 return r;
2090
2091 r = set_put(master->slaves, link);
2092 if (r < 0)
2093 return r;
2094
2095 link_ref(link);
2096 return 0;
2097 }
2098
2099 static void link_drop_from_master(Link *link, NetDev *netdev) {
2100 Link *master;
2101
2102 assert(link);
2103
2104 if (!link->manager || !netdev)
2105 return;
2106
2107 if (link_get(link->manager, netdev->ifindex, &master) < 0)
2108 return;
2109
2110 link_unref(set_remove(master->slaves, link));
2111 }
2112
2113 static void link_detach_from_manager(Link *link) {
2114 if (!link || !link->manager)
2115 return;
2116
2117 link_unref(set_remove(link->manager->links_requesting_uuid, link));
2118 link_clean(link);
2119
2120 /* The following must be called at last. */
2121 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2122 link_unref(link);
2123 }
2124
2125 void link_drop(Link *link) {
2126 if (!link || link->state == LINK_STATE_LINGER)
2127 return;
2128
2129 link_set_state(link, LINK_STATE_LINGER);
2130
2131 link_free_carrier_maps(link);
2132
2133 if (link->network) {
2134 link_drop_from_master(link, link->network->bridge);
2135 link_drop_from_master(link, link->network->bond);
2136 }
2137
2138 log_link_debug(link, "Link removed");
2139
2140 (void) unlink(link->state_file);
2141 link_detach_from_manager(link);
2142 }
2143
2144 static int link_joined(Link *link) {
2145 int r;
2146
2147 assert(link);
2148 assert(link->network);
2149
2150 if (!hashmap_isempty(link->bound_to_links)) {
2151 r = link_handle_bound_to_list(link);
2152 if (r < 0)
2153 return r;
2154 } else if (!(link->flags & IFF_UP)) {
2155 r = link_up(link);
2156 if (r < 0) {
2157 link_enter_failed(link);
2158 return r;
2159 }
2160 }
2161
2162 if (link->network->bridge) {
2163 r = link_set_bridge(link);
2164 if (r < 0)
2165 log_link_error_errno(link, r, "Could not set bridge message: %m");
2166
2167 r = link_append_to_master(link, link->network->bridge);
2168 if (r < 0)
2169 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2170 }
2171
2172 if (link->network->bond) {
2173 r = link_set_bond(link);
2174 if (r < 0)
2175 log_link_error_errno(link, r, "Could not set bond message: %m");
2176
2177 r = link_append_to_master(link, link->network->bond);
2178 if (r < 0)
2179 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2180 }
2181
2182 if (link->network->use_br_vlan &&
2183 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2184 r = link_set_bridge_vlan(link);
2185 if (r < 0)
2186 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2187 }
2188
2189 /* Skip setting up addresses until it gets carrier,
2190 or it would try to set addresses twice,
2191 which is bad for non-idempotent steps. */
2192 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2193 return 0;
2194
2195 return link_request_set_addresses(link);
2196 }
2197
2198 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2199 int r;
2200
2201 assert(link);
2202 assert(link->network);
2203 assert(link->enslaving > 0);
2204 assert(!link->enslaved_raw);
2205
2206 link->enslaving--;
2207
2208 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2209 return 1;
2210
2211 r = sd_netlink_message_get_errno(m);
2212 if (r < 0 && r != -EEXIST) {
2213 log_link_error_errno(link, r, "Could not join netdev: %m");
2214 link_enter_failed(link);
2215 return 1;
2216 } else
2217 log_link_debug(link, "Joined netdev");
2218
2219 if (link->enslaving == 0) {
2220 link->enslaved_raw = true;
2221 link_joined(link);
2222 }
2223
2224 return 1;
2225 }
2226
2227 static int link_enter_join_netdev(Link *link) {
2228 NetDev *netdev;
2229 Iterator i;
2230 int r;
2231
2232 assert(link);
2233 assert(link->network);
2234 assert(link->state == LINK_STATE_INITIALIZED);
2235
2236 link_set_state(link, LINK_STATE_CONFIGURING);
2237
2238 link_dirty(link);
2239 link->enslaving = 0;
2240 link->enslaved_raw = false;
2241
2242 if (link->network->bond) {
2243 if (link->network->bond->state == NETDEV_STATE_READY &&
2244 link->network->bond->ifindex == link->master_ifindex)
2245 return link_joined(link);
2246
2247 log_struct(LOG_DEBUG,
2248 LOG_LINK_INTERFACE(link),
2249 LOG_NETDEV_INTERFACE(link->network->bond),
2250 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2251
2252 link->enslaving++;
2253
2254 r = netdev_join(link->network->bond, link, netdev_join_handler);
2255 if (r < 0) {
2256 log_struct_errno(LOG_WARNING, r,
2257 LOG_LINK_INTERFACE(link),
2258 LOG_NETDEV_INTERFACE(link->network->bond),
2259 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2260 link_enter_failed(link);
2261 return r;
2262 }
2263 }
2264
2265 if (link->network->bridge) {
2266 log_struct(LOG_DEBUG,
2267 LOG_LINK_INTERFACE(link),
2268 LOG_NETDEV_INTERFACE(link->network->bridge),
2269 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2270
2271 link->enslaving++;
2272
2273 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2274 if (r < 0) {
2275 log_struct_errno(LOG_WARNING, r,
2276 LOG_LINK_INTERFACE(link),
2277 LOG_NETDEV_INTERFACE(link->network->bridge),
2278 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2279 link_enter_failed(link);
2280 return r;
2281 }
2282 }
2283
2284 if (link->network->vrf) {
2285 log_struct(LOG_DEBUG,
2286 LOG_LINK_INTERFACE(link),
2287 LOG_NETDEV_INTERFACE(link->network->vrf),
2288 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2289
2290 link->enslaving++;
2291
2292 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2293 if (r < 0) {
2294 log_struct_errno(LOG_WARNING, r,
2295 LOG_LINK_INTERFACE(link),
2296 LOG_NETDEV_INTERFACE(link->network->vrf),
2297 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2298 link_enter_failed(link);
2299 return r;
2300 }
2301 }
2302
2303 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2304
2305 if (netdev->ifindex > 0)
2306 /* Assume already enslaved. */
2307 continue;
2308
2309 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2310 continue;
2311
2312 log_struct(LOG_DEBUG,
2313 LOG_LINK_INTERFACE(link),
2314 LOG_NETDEV_INTERFACE(netdev),
2315 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2316
2317 link->enslaving++;
2318
2319 r = netdev_join(netdev, link, netdev_join_handler);
2320 if (r < 0) {
2321 log_struct_errno(LOG_WARNING, r,
2322 LOG_LINK_INTERFACE(link),
2323 LOG_NETDEV_INTERFACE(netdev),
2324 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2325 link_enter_failed(link);
2326 return r;
2327 }
2328 }
2329
2330 if (link->enslaving == 0)
2331 return link_joined(link);
2332
2333 return 0;
2334 }
2335
2336 static int link_set_ipv4_forward(Link *link) {
2337 int r;
2338
2339 if (!link_ipv4_forward_enabled(link))
2340 return 0;
2341
2342 /* We propagate the forwarding flag from one interface to the
2343 * global setting one way. This means: as long as at least one
2344 * interface was configured at any time that had IP forwarding
2345 * enabled the setting will stay on for good. We do this
2346 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2347 * somewhat in sync (see below). */
2348
2349 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2350 if (r < 0)
2351 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2352
2353 return 0;
2354 }
2355
2356 static int link_set_ipv6_forward(Link *link) {
2357 int r;
2358
2359 if (!link_ipv6_forward_enabled(link))
2360 return 0;
2361
2362 /* On Linux, the IPv6 stack does not know a per-interface
2363 * packet forwarding setting: either packet forwarding is on
2364 * for all, or off for all. We hence don't bother with a
2365 * per-interface setting, but simply propagate the interface
2366 * flag, if it is set, to the global flag, one-way. Note that
2367 * while IPv4 would allow a per-interface flag, we expose the
2368 * same behaviour there and also propagate the setting from
2369 * one to all, to keep things simple (see above). */
2370
2371 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2372 if (r < 0)
2373 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2374
2375 return 0;
2376 }
2377
2378 static int link_set_ipv6_privacy_extensions(Link *link) {
2379 IPv6PrivacyExtensions s;
2380 int r;
2381
2382 s = link_ipv6_privacy_extensions(link);
2383 if (s < 0)
2384 return 0;
2385
2386 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2387 if (r < 0)
2388 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2389
2390 return 0;
2391 }
2392
2393 static int link_set_ipv6_accept_ra(Link *link) {
2394 int r;
2395
2396 /* Make this a NOP if IPv6 is not available */
2397 if (!socket_ipv6_is_supported())
2398 return 0;
2399
2400 if (link->flags & IFF_LOOPBACK)
2401 return 0;
2402
2403 if (!link->network)
2404 return 0;
2405
2406 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2407 if (r < 0)
2408 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2409
2410 return 0;
2411 }
2412
2413 static int link_set_ipv6_dad_transmits(Link *link) {
2414 int r;
2415
2416 /* Make this a NOP if IPv6 is not available */
2417 if (!socket_ipv6_is_supported())
2418 return 0;
2419
2420 if (link->flags & IFF_LOOPBACK)
2421 return 0;
2422
2423 if (!link->network)
2424 return 0;
2425
2426 if (link->network->ipv6_dad_transmits < 0)
2427 return 0;
2428
2429 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2430 if (r < 0)
2431 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2432
2433 return 0;
2434 }
2435
2436 static int link_set_ipv6_hop_limit(Link *link) {
2437 int r;
2438
2439 /* Make this a NOP if IPv6 is not available */
2440 if (!socket_ipv6_is_supported())
2441 return 0;
2442
2443 if (link->flags & IFF_LOOPBACK)
2444 return 0;
2445
2446 if (!link->network)
2447 return 0;
2448
2449 if (link->network->ipv6_hop_limit < 0)
2450 return 0;
2451
2452 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2453 if (r < 0)
2454 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2455
2456 return 0;
2457 }
2458
2459 static int link_set_ipv6_mtu(Link *link) {
2460 int r;
2461
2462 /* Make this a NOP if IPv6 is not available */
2463 if (!socket_ipv6_is_supported())
2464 return 0;
2465
2466 if (link->flags & IFF_LOOPBACK)
2467 return 0;
2468
2469 if (link->network->ipv6_mtu == 0)
2470 return 0;
2471
2472 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2473 if (r < 0)
2474 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2475
2476 return 0;
2477 }
2478
2479 static bool link_is_static_address_configured(Link *link, Address *address) {
2480 Address *net_address;
2481
2482 assert(link);
2483 assert(address);
2484
2485 if (!link->network)
2486 return false;
2487
2488 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2489 if (address_equal(net_address, address))
2490 return true;
2491
2492 return false;
2493 }
2494
2495 static bool link_is_static_route_configured(Link *link, Route *route) {
2496 Route *net_route;
2497
2498 assert(link);
2499 assert(route);
2500
2501 if (!link->network)
2502 return false;
2503
2504 LIST_FOREACH(routes, net_route, link->network->static_routes)
2505 if (route_equal(net_route, route))
2506 return true;
2507
2508 return false;
2509 }
2510
2511 static int link_drop_foreign_config(Link *link) {
2512 Address *address;
2513 Route *route;
2514 Iterator i;
2515 int r;
2516
2517 SET_FOREACH(address, link->addresses_foreign, i) {
2518 /* we consider IPv6LL addresses to be managed by the kernel */
2519 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2520 continue;
2521
2522 if (link_is_static_address_configured(link, address)) {
2523 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2524 if (r < 0)
2525 return log_link_error_errno(link, r, "Failed to add address: %m");
2526 } else {
2527 r = address_remove(address, link, NULL);
2528 if (r < 0)
2529 return r;
2530 }
2531 }
2532
2533 SET_FOREACH(route, link->routes_foreign, i) {
2534 /* do not touch routes managed by the kernel */
2535 if (route->protocol == RTPROT_KERNEL)
2536 continue;
2537
2538 if (link_is_static_route_configured(link, route)) {
2539 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2540 if (r < 0)
2541 return r;
2542 } else {
2543 r = route_remove(route, link, NULL);
2544 if (r < 0)
2545 return r;
2546 }
2547 }
2548
2549 return 0;
2550 }
2551
2552 static int link_drop_config(Link *link) {
2553 Address *address, *pool_address;
2554 Route *route;
2555 Iterator i;
2556 int r;
2557
2558 SET_FOREACH(address, link->addresses, i) {
2559 /* we consider IPv6LL addresses to be managed by the kernel */
2560 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2561 continue;
2562
2563 r = address_remove(address, link, NULL);
2564 if (r < 0)
2565 return r;
2566
2567 /* If this address came from an address pool, clean up the pool */
2568 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2569 if (address_equal(address, pool_address)) {
2570 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2571 address_free(pool_address);
2572 break;
2573 }
2574 }
2575 }
2576
2577 SET_FOREACH(route, link->routes, i) {
2578 /* do not touch routes managed by the kernel */
2579 if (route->protocol == RTPROT_KERNEL)
2580 continue;
2581
2582 r = route_remove(route, link, NULL);
2583 if (r < 0)
2584 return r;
2585 }
2586
2587 ndisc_flush(link);
2588
2589 return 0;
2590 }
2591
2592 static int link_configure(Link *link) {
2593 int r;
2594
2595 assert(link);
2596 assert(link->network);
2597 assert(link->state == LINK_STATE_INITIALIZED);
2598
2599 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
2600 return link_configure_can(link);
2601
2602 /* Drop foreign config, but ignore loopback or critical devices.
2603 * We do not want to remove loopback address or addresses used for root NFS. */
2604 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2605 r = link_drop_foreign_config(link);
2606 if (r < 0)
2607 return r;
2608 }
2609
2610 r = link_set_proxy_arp(link);
2611 if (r < 0)
2612 return r;
2613
2614 r = ipv6_proxy_ndp_addresses_configure(link);
2615 if (r < 0)
2616 return r;
2617
2618 r = link_set_ipv4_forward(link);
2619 if (r < 0)
2620 return r;
2621
2622 r = link_set_ipv6_forward(link);
2623 if (r < 0)
2624 return r;
2625
2626 r = link_set_ipv6_privacy_extensions(link);
2627 if (r < 0)
2628 return r;
2629
2630 r = link_set_ipv6_accept_ra(link);
2631 if (r < 0)
2632 return r;
2633
2634 r = link_set_ipv6_dad_transmits(link);
2635 if (r < 0)
2636 return r;
2637
2638 r = link_set_ipv6_hop_limit(link);
2639 if (r < 0)
2640 return r;
2641
2642 r = link_set_flags(link);
2643 if (r < 0)
2644 return r;
2645
2646 r = link_set_ipv6_mtu(link);
2647 if (r < 0)
2648 return r;
2649
2650 if (link_ipv4ll_enabled(link) || link_ipv4ll_fallback_enabled(link)) {
2651 r = ipv4ll_configure(link);
2652 if (r < 0)
2653 return r;
2654 }
2655
2656 if (link_dhcp4_enabled(link)) {
2657 r = dhcp4_set_promote_secondaries(link);
2658 if (r < 0)
2659 return r;
2660
2661 r = dhcp4_configure(link);
2662 if (r < 0)
2663 return r;
2664 }
2665
2666 if (link_dhcp4_server_enabled(link)) {
2667 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2668 if (r < 0)
2669 return r;
2670
2671 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2672 if (r < 0)
2673 return r;
2674 }
2675
2676 if (link_dhcp6_enabled(link) ||
2677 link_ipv6_accept_ra_enabled(link)) {
2678 r = dhcp6_configure(link);
2679 if (r < 0)
2680 return r;
2681 }
2682
2683 if (link_ipv6_accept_ra_enabled(link)) {
2684 r = ndisc_configure(link);
2685 if (r < 0)
2686 return r;
2687 }
2688
2689 if (link_radv_enabled(link)) {
2690 r = radv_configure(link);
2691 if (r < 0)
2692 return r;
2693 }
2694
2695 if (link_lldp_rx_enabled(link)) {
2696 r = link_lldp_rx_configure(link);
2697 if (r < 0)
2698 return r;
2699 }
2700
2701 r = link_configure_mtu(link);
2702 if (r < 0)
2703 return r;
2704
2705 r = link_configure_addrgen_mode(link);
2706 if (r < 0)
2707 return r;
2708
2709 return link_configure_after_setting_mtu(link);
2710 }
2711
2712 static int link_configure_after_setting_mtu(Link *link) {
2713 int r;
2714
2715 assert(link);
2716 assert(link->network);
2717 assert(link->state == LINK_STATE_INITIALIZED);
2718
2719 if (link->setting_mtu)
2720 return 0;
2721
2722 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2723 r = link_acquire_conf(link);
2724 if (r < 0)
2725 return r;
2726 }
2727
2728 return link_enter_join_netdev(link);
2729 }
2730
2731 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
2732 assert(duid);
2733
2734 if (duid->raw_data_len > 0)
2735 return 0;
2736
2737 if (duid->type != DUID_TYPE_UUID)
2738 return -EINVAL;
2739
2740 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
2741 duid->raw_data_len = sizeof(sd_id128_t);
2742
2743 return 1;
2744 }
2745
2746 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
2747 Manager *manager = userdata;
2748 const sd_bus_error *e;
2749 const void *a;
2750 size_t sz;
2751 DUID *duid;
2752 Link *link;
2753 int r;
2754
2755 assert(m);
2756 assert(manager);
2757
2758 e = sd_bus_message_get_error(m);
2759 if (e) {
2760 log_error_errno(sd_bus_error_get_errno(e),
2761 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
2762 e->message);
2763 goto configure;
2764 }
2765
2766 r = sd_bus_message_read_array(m, 'y', &a, &sz);
2767 if (r < 0)
2768 goto configure;
2769
2770 if (sz != sizeof(sd_id128_t)) {
2771 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
2772 goto configure;
2773 }
2774
2775 memcpy(&manager->product_uuid, a, sz);
2776 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
2777 (void) duid_set_uuid(duid, manager->product_uuid);
2778
2779 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
2780
2781 configure:
2782 while ((link = set_steal_first(manager->links_requesting_uuid))) {
2783 r = link_configure(link);
2784 if (r < 0)
2785 log_link_error_errno(link, r, "Failed to configure link: %m");
2786 }
2787
2788 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
2789
2790 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
2791 * even if the method fails. */
2792 manager->has_product_uuid = true;
2793
2794 return 1;
2795 }
2796
2797 static bool link_requires_uuid(Link *link) {
2798 const DUID *duid;
2799
2800 assert(link);
2801 assert(link->manager);
2802 assert(link->network);
2803
2804 duid = link_get_duid(link);
2805 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
2806 return false;
2807
2808 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
2809 return true;
2810
2811 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
2812 return true;
2813
2814 return false;
2815 }
2816
2817 static int link_configure_duid(Link *link) {
2818 Manager *m;
2819 DUID *duid;
2820 int r;
2821
2822 assert(link);
2823 assert(link->manager);
2824 assert(link->network);
2825
2826 m = link->manager;
2827 duid = link_get_duid(link);
2828
2829 if (!link_requires_uuid(link))
2830 return 1;
2831
2832 if (m->has_product_uuid) {
2833 (void) duid_set_uuid(duid, m->product_uuid);
2834 return 1;
2835 }
2836
2837 if (!m->links_requesting_uuid) {
2838 r = manager_request_product_uuid(m, link);
2839 if (r < 0) {
2840 if (r == -ENOMEM)
2841 return r;
2842
2843 log_link_warning_errno(link, r,
2844 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
2845 return 1;
2846 }
2847 } else {
2848 r = set_put(m->links_requesting_uuid, link);
2849 if (r < 0)
2850 return log_oom();
2851
2852 r = set_put(m->duids_requesting_uuid, duid);
2853 if (r < 0)
2854 return log_oom();
2855 }
2856
2857 return 0;
2858 }
2859
2860 static int link_initialized_and_synced(Link *link) {
2861 Network *network;
2862 int r;
2863
2864 assert(link);
2865 assert(link->ifname);
2866 assert(link->manager);
2867
2868 /* We may get called either from the asynchronous netlink callback,
2869 * or directly for link_add() if running in a container. See link_add(). */
2870 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
2871 return 0;
2872
2873 log_link_debug(link, "Link state is up-to-date");
2874 link_set_state(link, LINK_STATE_INITIALIZED);
2875
2876 r = link_new_bound_by_list(link);
2877 if (r < 0)
2878 return r;
2879
2880 r = link_handle_bound_by_list(link);
2881 if (r < 0)
2882 return r;
2883
2884 if (!link->network) {
2885 r = network_get(link->manager, link->sd_device, link->ifname,
2886 &link->mac, &network);
2887 if (r == -ENOENT) {
2888 link_enter_unmanaged(link);
2889 return 0;
2890 } else if (r == 0 && network->unmanaged) {
2891 link_enter_unmanaged(link);
2892 return 0;
2893 } else if (r < 0)
2894 return r;
2895
2896 if (link->flags & IFF_LOOPBACK) {
2897 if (network->link_local != ADDRESS_FAMILY_NO)
2898 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2899
2900 if (network->dhcp != ADDRESS_FAMILY_NO)
2901 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2902
2903 if (network->dhcp_server)
2904 log_link_debug(link, "Ignoring DHCP server for loopback link");
2905 }
2906
2907 r = network_apply(network, link);
2908 if (r < 0)
2909 return r;
2910 }
2911
2912 r = link_new_bound_to_list(link);
2913 if (r < 0)
2914 return r;
2915
2916 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
2917 * link_configure() is called later asynchronously. */
2918 r = link_configure_duid(link);
2919 if (r <= 0)
2920 return r;
2921
2922 r = link_configure(link);
2923 if (r < 0)
2924 return r;
2925
2926 return 0;
2927 }
2928
2929 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2930 (void) link_initialized_and_synced(link);
2931 return 1;
2932 }
2933
2934 int link_initialized(Link *link, sd_device *device) {
2935 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2936 int r;
2937
2938 assert(link);
2939 assert(link->manager);
2940 assert(link->manager->rtnl);
2941 assert(device);
2942
2943 if (link->state != LINK_STATE_PENDING)
2944 return 0;
2945
2946 if (link->sd_device)
2947 return 0;
2948
2949 log_link_debug(link, "udev initialized link");
2950 link_set_state(link, LINK_STATE_INITIALIZED);
2951
2952 link->sd_device = sd_device_ref(device);
2953
2954 /* udev has initialized the link, but we don't know if we have yet
2955 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2956 * when it returns we know that the pending NEWLINKs have already been
2957 * processed and that we are up-to-date */
2958
2959 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2960 link->ifindex);
2961 if (r < 0)
2962 return r;
2963
2964 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
2965 link_netlink_destroy_callback, link);
2966 if (r < 0)
2967 return r;
2968
2969 link_ref(link);
2970
2971 return 0;
2972 }
2973
2974 static int link_load(Link *link) {
2975 _cleanup_free_ char *network_file = NULL,
2976 *addresses = NULL,
2977 *routes = NULL,
2978 *dhcp4_address = NULL,
2979 *ipv4ll_address = NULL;
2980 union in_addr_union address;
2981 union in_addr_union route_dst;
2982 const char *p;
2983 int r;
2984
2985 assert(link);
2986
2987 r = parse_env_file(NULL, link->state_file,
2988 "NETWORK_FILE", &network_file,
2989 "ADDRESSES", &addresses,
2990 "ROUTES", &routes,
2991 "DHCP4_ADDRESS", &dhcp4_address,
2992 "IPV4LL_ADDRESS", &ipv4ll_address);
2993 if (r < 0 && r != -ENOENT)
2994 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
2995
2996 if (network_file) {
2997 Network *network;
2998 char *suffix;
2999
3000 /* drop suffix */
3001 suffix = strrchr(network_file, '.');
3002 if (!suffix) {
3003 log_link_debug(link, "Failed to get network name from %s", network_file);
3004 goto network_file_fail;
3005 }
3006 *suffix = '\0';
3007
3008 r = network_get_by_name(link->manager, basename(network_file), &network);
3009 if (r < 0) {
3010 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3011 goto network_file_fail;
3012 }
3013
3014 r = network_apply(network, link);
3015 if (r < 0)
3016 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3017 }
3018
3019 network_file_fail:
3020
3021 if (addresses) {
3022 p = addresses;
3023
3024 for (;;) {
3025 _cleanup_free_ char *address_str = NULL;
3026 char *prefixlen_str;
3027 int family;
3028 unsigned char prefixlen;
3029
3030 r = extract_first_word(&p, &address_str, NULL, 0);
3031 if (r < 0) {
3032 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3033 continue;
3034 }
3035 if (r == 0)
3036 break;
3037
3038 prefixlen_str = strchr(address_str, '/');
3039 if (!prefixlen_str) {
3040 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3041 continue;
3042 }
3043
3044 *prefixlen_str++ = '\0';
3045
3046 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3047 if (r != 1) {
3048 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3049 continue;
3050 }
3051
3052 r = in_addr_from_string_auto(address_str, &family, &address);
3053 if (r < 0) {
3054 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3055 continue;
3056 }
3057
3058 r = address_add(link, family, &address, prefixlen, NULL);
3059 if (r < 0)
3060 return log_link_error_errno(link, r, "Failed to add address: %m");
3061 }
3062 }
3063
3064 if (routes) {
3065 p = routes;
3066
3067 for (;;) {
3068 Route *route;
3069 _cleanup_free_ char *route_str = NULL;
3070 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3071 usec_t lifetime;
3072 char *prefixlen_str;
3073 int family;
3074 unsigned char prefixlen, tos, table;
3075 uint32_t priority;
3076
3077 r = extract_first_word(&p, &route_str, NULL, 0);
3078 if (r < 0) {
3079 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3080 continue;
3081 }
3082 if (r == 0)
3083 break;
3084
3085 prefixlen_str = strchr(route_str, '/');
3086 if (!prefixlen_str) {
3087 log_link_debug(link, "Failed to parse route %s", route_str);
3088 continue;
3089 }
3090
3091 *prefixlen_str++ = '\0';
3092
3093 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3094 if (r != 5) {
3095 log_link_debug(link,
3096 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3097 prefixlen_str);
3098 continue;
3099 }
3100
3101 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3102 if (r < 0) {
3103 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3104 continue;
3105 }
3106
3107 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3108 if (r < 0)
3109 return log_link_error_errno(link, r, "Failed to add route: %m");
3110
3111 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3112 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3113 0, route_expire_handler, route);
3114 if (r < 0)
3115 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3116 }
3117
3118 route->lifetime = lifetime;
3119 sd_event_source_unref(route->expire);
3120 route->expire = TAKE_PTR(expire);
3121 }
3122 }
3123
3124 if (dhcp4_address) {
3125 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3126 if (r < 0) {
3127 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3128 goto dhcp4_address_fail;
3129 }
3130
3131 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3132 if (r < 0)
3133 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3134
3135 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3136 if (r < 0)
3137 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3138 }
3139
3140 dhcp4_address_fail:
3141
3142 if (ipv4ll_address) {
3143 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3144 if (r < 0) {
3145 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3146 goto ipv4ll_address_fail;
3147 }
3148
3149 r = sd_ipv4ll_new(&link->ipv4ll);
3150 if (r < 0)
3151 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3152
3153 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3154 if (r < 0)
3155 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3156 }
3157
3158 ipv4ll_address_fail:
3159
3160 return 0;
3161 }
3162
3163 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3164 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3165 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3166 Link *link;
3167 int r;
3168
3169 assert(m);
3170 assert(m->rtnl);
3171 assert(message);
3172 assert(ret);
3173
3174 r = link_new(m, message, ret);
3175 if (r < 0)
3176 return r;
3177
3178 link = *ret;
3179
3180 log_link_debug(link, "Link %d added", link->ifindex);
3181
3182 r = link_load(link);
3183 if (r < 0)
3184 return r;
3185
3186 if (detect_container() <= 0) {
3187 /* not in a container, udev will be around */
3188 sprintf(ifindex_str, "n%d", link->ifindex);
3189 r = sd_device_new_from_device_id(&device, ifindex_str);
3190 if (r < 0) {
3191 log_link_warning_errno(link, r, "Could not find device: %m");
3192 goto failed;
3193 }
3194
3195 r = sd_device_get_is_initialized(device);
3196 if (r < 0) {
3197 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3198 goto failed;
3199 }
3200 if (r == 0) {
3201 /* not yet ready */
3202 log_link_debug(link, "link pending udev initialization...");
3203 return 0;
3204 }
3205
3206 r = device_is_renaming(device);
3207 if (r < 0) {
3208 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3209 goto failed;
3210 }
3211 if (r > 0) {
3212 log_link_debug(link, "Interface is under renaming, pending initialization.");
3213 return 0;
3214 }
3215
3216 r = link_initialized(link, device);
3217 if (r < 0)
3218 goto failed;
3219 } else {
3220 r = link_initialized_and_synced(link);
3221 if (r < 0)
3222 goto failed;
3223 }
3224
3225 return 0;
3226 failed:
3227 link_enter_failed(link);
3228 return r;
3229 }
3230
3231 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3232 int r;
3233
3234 assert(link);
3235
3236 log_link_info(link, "Gained IPv6LL");
3237
3238 link->ipv6ll_address = *address;
3239 link_check_ready(link);
3240
3241 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3242 r = link_acquire_ipv6_conf(link);
3243 if (r < 0) {
3244 link_enter_failed(link);
3245 return r;
3246 }
3247 }
3248
3249 return 0;
3250 }
3251
3252 static int link_carrier_gained(Link *link) {
3253 int r;
3254
3255 assert(link);
3256
3257 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3258 r = link_acquire_conf(link);
3259 if (r < 0) {
3260 link_enter_failed(link);
3261 return r;
3262 }
3263
3264 r = link_request_set_addresses(link);
3265 if (r < 0)
3266 return r;
3267 }
3268
3269 r = link_handle_bound_by_list(link);
3270 if (r < 0)
3271 return r;
3272
3273 return 0;
3274 }
3275
3276 static int link_carrier_lost(Link *link) {
3277 int r;
3278
3279 assert(link);
3280
3281 if (link->network && link->network->ignore_carrier_loss)
3282 return 0;
3283
3284 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3285 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3286 * configuration and stop the clients as well. */
3287 if (link->setting_mtu)
3288 return 0;
3289
3290 r = link_stop_clients(link);
3291 if (r < 0) {
3292 link_enter_failed(link);
3293 return r;
3294 }
3295
3296 if (link_dhcp4_server_enabled(link))
3297 (void) sd_dhcp_server_stop(link->dhcp_server);
3298
3299 r = link_drop_config(link);
3300 if (r < 0)
3301 return r;
3302
3303 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3304 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3305 r = link_drop_foreign_config(link);
3306 if (r < 0)
3307 return r;
3308 }
3309
3310 r = link_handle_bound_by_list(link);
3311 if (r < 0)
3312 return r;
3313
3314 return 0;
3315 }
3316
3317 int link_carrier_reset(Link *link) {
3318 int r;
3319
3320 assert(link);
3321
3322 if (link_has_carrier(link)) {
3323 r = link_carrier_lost(link);
3324 if (r < 0)
3325 return r;
3326
3327 r = link_carrier_gained(link);
3328 if (r < 0)
3329 return r;
3330
3331 log_link_info(link, "Reset carrier");
3332 }
3333
3334 return 0;
3335 }
3336
3337 int link_update(Link *link, sd_netlink_message *m) {
3338 struct ether_addr mac;
3339 const char *ifname;
3340 uint32_t mtu;
3341 bool had_carrier, carrier_gained, carrier_lost;
3342 int old_master, r;
3343
3344 assert(link);
3345 assert(link->ifname);
3346 assert(m);
3347
3348 if (link->state == LINK_STATE_LINGER) {
3349 log_link_info(link, "Link re-added");
3350 link_set_state(link, LINK_STATE_CONFIGURING);
3351
3352 r = link_new_carrier_maps(link);
3353 if (r < 0)
3354 return r;
3355 }
3356
3357 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3358 if (r >= 0 && !streq(ifname, link->ifname)) {
3359 Manager *manager = link->manager;
3360
3361 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3362
3363 link_drop(link);
3364 r = link_add(manager, m, &link);
3365 if (r < 0)
3366 return r;
3367 }
3368
3369 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3370 if (r >= 0 && mtu > 0) {
3371 link->mtu = mtu;
3372 if (link->original_mtu == 0) {
3373 link->original_mtu = mtu;
3374 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3375 }
3376
3377 if (link->dhcp_client) {
3378 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3379 link->mtu);
3380 if (r < 0)
3381 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3382 }
3383
3384 if (link->radv) {
3385 r = sd_radv_set_mtu(link->radv, link->mtu);
3386 if (r < 0)
3387 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3388 }
3389 }
3390
3391 /* The kernel may broadcast NEWLINK messages without the MAC address
3392 set, simply ignore them. */
3393 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3394 if (r >= 0) {
3395 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3396 ETH_ALEN)) {
3397
3398 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3399 ETH_ALEN);
3400
3401 log_link_debug(link, "MAC address: "
3402 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3403 mac.ether_addr_octet[0],
3404 mac.ether_addr_octet[1],
3405 mac.ether_addr_octet[2],
3406 mac.ether_addr_octet[3],
3407 mac.ether_addr_octet[4],
3408 mac.ether_addr_octet[5]);
3409
3410 if (link->ipv4ll) {
3411 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3412 if (r < 0)
3413 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3414 }
3415
3416 if (link->dhcp_client) {
3417 r = sd_dhcp_client_set_mac(link->dhcp_client,
3418 (const uint8_t *) &link->mac,
3419 sizeof (link->mac),
3420 ARPHRD_ETHER);
3421 if (r < 0)
3422 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3423
3424 r = dhcp4_set_client_identifier(link);
3425 if (r < 0)
3426 return r;
3427 }
3428
3429 if (link->dhcp6_client) {
3430 const DUID* duid = link_get_duid(link);
3431
3432 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3433 (const uint8_t *) &link->mac,
3434 sizeof (link->mac),
3435 ARPHRD_ETHER);
3436 if (r < 0)
3437 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3438
3439 if (link->network->iaid_set) {
3440 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3441 link->network->iaid);
3442 if (r < 0)
3443 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3444 }
3445
3446 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3447 duid->type,
3448 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3449 duid->raw_data_len);
3450 if (r < 0)
3451 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3452 }
3453
3454 if (link->radv) {
3455 r = sd_radv_set_mac(link->radv, &link->mac);
3456 if (r < 0)
3457 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3458 }
3459
3460 if (link->ndisc) {
3461 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3462 if (r < 0)
3463 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3464 }
3465 }
3466 }
3467
3468 old_master = link->master_ifindex;
3469 (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
3470
3471 had_carrier = link_has_carrier(link);
3472
3473 r = link_update_flags(link, m, old_master != link->master_ifindex);
3474 if (r < 0)
3475 return r;
3476
3477 r = link_update_lldp(link);
3478 if (r < 0)
3479 return r;
3480
3481 carrier_gained = !had_carrier && link_has_carrier(link);
3482 carrier_lost = had_carrier && !link_has_carrier(link);
3483
3484 if (carrier_gained) {
3485 log_link_info(link, "Gained carrier");
3486
3487 r = link_carrier_gained(link);
3488 if (r < 0)
3489 return r;
3490 } else if (carrier_lost) {
3491 log_link_info(link, "Lost carrier");
3492
3493 r = link_carrier_lost(link);
3494 if (r < 0)
3495 return r;
3496 }
3497
3498 return 0;
3499 }
3500
3501 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3502 bool space = false;
3503 Iterator i;
3504 Link *link;
3505
3506 assert(f);
3507 assert(prefix);
3508
3509 if (hashmap_isempty(h))
3510 return;
3511
3512 fputs(prefix, f);
3513 HASHMAP_FOREACH(link, h, i) {
3514 if (space)
3515 fputc(' ', f);
3516
3517 fprintf(f, "%i", link->ifindex);
3518 space = true;
3519 }
3520
3521 fputc('\n', f);
3522 }
3523
3524 int link_save(Link *link) {
3525 _cleanup_free_ char *temp_path = NULL;
3526 _cleanup_fclose_ FILE *f = NULL;
3527 const char *admin_state, *oper_state;
3528 Address *a;
3529 Route *route;
3530 Iterator i;
3531 int r;
3532
3533 assert(link);
3534 assert(link->state_file);
3535 assert(link->lease_file);
3536 assert(link->manager);
3537
3538 if (link->state == LINK_STATE_LINGER) {
3539 (void) unlink(link->state_file);
3540 return 0;
3541 }
3542
3543 link_lldp_save(link);
3544
3545 admin_state = link_state_to_string(link->state);
3546 assert(admin_state);
3547
3548 oper_state = link_operstate_to_string(link->operstate);
3549 assert(oper_state);
3550
3551 r = fopen_temporary(link->state_file, &f, &temp_path);
3552 if (r < 0)
3553 goto fail;
3554
3555 (void) fchmod(fileno(f), 0644);
3556
3557 fprintf(f,
3558 "# This is private data. Do not parse.\n"
3559 "ADMIN_STATE=%s\n"
3560 "OPER_STATE=%s\n",
3561 admin_state, oper_state);
3562
3563 if (link->network) {
3564 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
3565 const char *dhcp_domainname = NULL, *p;
3566 sd_dhcp6_lease *dhcp6_lease = NULL;
3567 unsigned j;
3568 bool space;
3569
3570 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3571 yes_no(link->network->required_for_online));
3572
3573 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
3574 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
3575
3576 if (link->dhcp6_client) {
3577 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3578 if (r < 0 && r != -ENOMSG)
3579 log_link_debug(link, "No DHCPv6 lease");
3580 }
3581
3582 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3583
3584 fputs("DNS=", f);
3585 space = false;
3586
3587 for (j = 0; j < link->network->n_dns; j++) {
3588 _cleanup_free_ char *b = NULL;
3589
3590 r = in_addr_to_string(link->network->dns[j].family,
3591 &link->network->dns[j].address, &b);
3592 if (r < 0) {
3593 log_debug_errno(r, "Failed to format address, ignoring: %m");
3594 continue;
3595 }
3596
3597 if (space)
3598 fputc(' ', f);
3599 fputs(b, f);
3600 space = true;
3601 }
3602
3603 if (link->network->dhcp_use_dns &&
3604 link->dhcp_lease) {
3605 const struct in_addr *addresses;
3606
3607 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3608 if (r > 0)
3609 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3610 space = true;
3611 }
3612
3613 if (link->network->dhcp_use_dns && dhcp6_lease) {
3614 struct in6_addr *in6_addrs;
3615
3616 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3617 if (r > 0) {
3618 if (space)
3619 fputc(' ', f);
3620 serialize_in6_addrs(f, in6_addrs, r);
3621 space = true;
3622 }
3623 }
3624
3625 /* Make sure to flush out old entries before we use the NDISC data */
3626 ndisc_vacuum(link);
3627
3628 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3629 NDiscRDNSS *dd;
3630
3631 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3632 if (space)
3633 fputc(' ', f);
3634
3635 serialize_in6_addrs(f, &dd->address, 1);
3636 space = true;
3637 }
3638 }
3639
3640 fputc('\n', f);
3641
3642 fputs("NTP=", f);
3643 space = false;
3644 fputstrv(f, link->network->ntp, NULL, &space);
3645
3646 if (link->network->dhcp_use_ntp &&
3647 link->dhcp_lease) {
3648 const struct in_addr *addresses;
3649
3650 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3651 if (r > 0)
3652 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3653 space = true;
3654 }
3655
3656 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3657 struct in6_addr *in6_addrs;
3658 char **hosts;
3659
3660 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3661 &in6_addrs);
3662 if (r > 0) {
3663 if (space)
3664 fputc(' ', f);
3665 serialize_in6_addrs(f, in6_addrs, r);
3666 space = true;
3667 }
3668
3669 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3670 if (r > 0)
3671 fputstrv(f, hosts, NULL, &space);
3672 }
3673
3674 fputc('\n', f);
3675
3676 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3677 if (link->dhcp_lease) {
3678 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3679 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3680 }
3681 if (dhcp6_lease)
3682 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3683 }
3684
3685 fputs("DOMAINS=", f);
3686 space = false;
3687 ORDERED_SET_FOREACH(p, link->network->search_domains, i)
3688 fputs_with_space(f, p, NULL, &space);
3689
3690 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3691 NDiscDNSSL *dd;
3692
3693 if (dhcp_domainname)
3694 fputs_with_space(f, dhcp_domainname, NULL, &space);
3695 if (dhcp_domains)
3696 fputstrv(f, dhcp_domains, NULL, &space);
3697 if (dhcp6_domains)
3698 fputstrv(f, dhcp6_domains, NULL, &space);
3699
3700 SET_FOREACH(dd, link->ndisc_dnssl, i)
3701 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3702 }
3703
3704 fputc('\n', f);
3705
3706 fputs("ROUTE_DOMAINS=", f);
3707 space = false;
3708 ORDERED_SET_FOREACH(p, link->network->route_domains, i)
3709 fputs_with_space(f, p, NULL, &space);
3710
3711 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3712 NDiscDNSSL *dd;
3713
3714 if (dhcp_domainname)
3715 fputs_with_space(f, dhcp_domainname, NULL, &space);
3716 if (dhcp_domains)
3717 fputstrv(f, dhcp_domains, NULL, &space);
3718 if (dhcp6_domains)
3719 fputstrv(f, dhcp6_domains, NULL, &space);
3720
3721 SET_FOREACH(dd, link->ndisc_dnssl, i)
3722 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3723 }
3724
3725 fputc('\n', f);
3726
3727 fprintf(f, "LLMNR=%s\n",
3728 resolve_support_to_string(link->network->llmnr));
3729 fprintf(f, "MDNS=%s\n",
3730 resolve_support_to_string(link->network->mdns));
3731 if (link->network->dns_default_route >= 0)
3732 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
3733
3734 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3735 fprintf(f, "DNS_OVER_TLS=%s\n",
3736 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
3737
3738 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3739 fprintf(f, "DNSSEC=%s\n",
3740 dnssec_mode_to_string(link->network->dnssec_mode));
3741
3742 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3743 const char *n;
3744
3745 fputs("DNSSEC_NTA=", f);
3746 space = false;
3747 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3748 fputs_with_space(f, n, NULL, &space);
3749 fputc('\n', f);
3750 }
3751
3752 fputs("ADDRESSES=", f);
3753 space = false;
3754 SET_FOREACH(a, link->addresses, i) {
3755 _cleanup_free_ char *address_str = NULL;
3756
3757 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3758 if (r < 0)
3759 goto fail;
3760
3761 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3762 space = true;
3763 }
3764 fputc('\n', f);
3765
3766 fputs("ROUTES=", f);
3767 space = false;
3768 SET_FOREACH(route, link->routes, i) {
3769 _cleanup_free_ char *route_str = NULL;
3770
3771 r = in_addr_to_string(route->family, &route->dst, &route_str);
3772 if (r < 0)
3773 goto fail;
3774
3775 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
3776 space ? " " : "", route_str,
3777 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3778 space = true;
3779 }
3780
3781 fputc('\n', f);
3782 }
3783
3784 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3785 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3786
3787 if (link->dhcp_lease) {
3788 struct in_addr address;
3789 const char *tz = NULL;
3790
3791 assert(link->network);
3792
3793 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3794 if (r >= 0)
3795 fprintf(f, "TIMEZONE=%s\n", tz);
3796
3797 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3798 if (r >= 0) {
3799 fputs("DHCP4_ADDRESS=", f);
3800 serialize_in_addrs(f, &address, 1, false, NULL);
3801 fputc('\n', f);
3802 }
3803
3804 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3805 if (r < 0)
3806 goto fail;
3807
3808 fprintf(f,
3809 "DHCP_LEASE=%s\n",
3810 link->lease_file);
3811 } else
3812 (void) unlink(link->lease_file);
3813
3814 if (link->ipv4ll) {
3815 struct in_addr address;
3816
3817 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3818 if (r >= 0) {
3819 fputs("IPV4LL_ADDRESS=", f);
3820 serialize_in_addrs(f, &address, 1, false, NULL);
3821 fputc('\n', f);
3822 }
3823 }
3824
3825 r = fflush_and_check(f);
3826 if (r < 0)
3827 goto fail;
3828
3829 if (rename(temp_path, link->state_file) < 0) {
3830 r = -errno;
3831 goto fail;
3832 }
3833
3834 return 0;
3835
3836 fail:
3837 (void) unlink(link->state_file);
3838 if (temp_path)
3839 (void) unlink(temp_path);
3840
3841 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3842 }
3843
3844 /* The serialized state in /run is no longer up-to-date. */
3845 void link_dirty(Link *link) {
3846 int r;
3847
3848 assert(link);
3849
3850 /* mark manager dirty as link is dirty */
3851 manager_dirty(link->manager);
3852
3853 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3854 if (r < 0)
3855 /* allocation errors are ignored */
3856 return;
3857
3858 r = set_put(link->manager->dirty_links, link);
3859 if (r <= 0)
3860 /* don't take another ref if the link was already dirty */
3861 return;
3862
3863 link_ref(link);
3864 }
3865
3866 /* The serialized state in /run is up-to-date */
3867 void link_clean(Link *link) {
3868 assert(link);
3869 assert(link->manager);
3870
3871 link_unref(set_remove(link->manager->dirty_links, link));
3872 }
3873
3874 static const char* const link_state_table[_LINK_STATE_MAX] = {
3875 [LINK_STATE_PENDING] = "pending",
3876 [LINK_STATE_INITIALIZED] = "initialized",
3877 [LINK_STATE_CONFIGURING] = "configuring",
3878 [LINK_STATE_CONFIGURED] = "configured",
3879 [LINK_STATE_UNMANAGED] = "unmanaged",
3880 [LINK_STATE_FAILED] = "failed",
3881 [LINK_STATE_LINGER] = "linger",
3882 };
3883
3884 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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