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