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[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", "vxcan"))
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", "vxcan"))
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", "vxcan"))
120 return false;
121
122 return link->network->dhcp_server;
123 }
124
125 bool link_ipv4ll_enabled(Link *link, AddressFamilyBoolean mask) {
126 assert(link);
127 assert((mask & ~(ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) == 0);
128
129 if (link->flags & IFF_LOOPBACK)
130 return false;
131
132 if (!link->network)
133 return false;
134
135 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "ip6gre", "ip6tnl", "sit", "vti", "vti6", "can", "vcan", "vxcan", "nlmon"))
136 return false;
137
138 /* L3 or L3S mode do not support ARP. */
139 if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S))
140 return false;
141
142 if (link->network->bond)
143 return false;
144
145 if (link->network->bond)
146 return false;
147
148 return link->network->link_local & mask;
149 }
150
151 static bool link_ipv6ll_enabled(Link *link) {
152 assert(link);
153
154 if (!socket_ipv6_is_supported())
155 return false;
156
157 if (link->flags & IFF_LOOPBACK)
158 return false;
159
160 if (!link->network)
161 return false;
162
163 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "sit", "vti", "can", "vcan", "vxcan", "nlmon"))
164 return false;
165
166 if (link->network->bond)
167 return false;
168
169 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
170 return false;
171
172 return link->network->link_local & ADDRESS_FAMILY_IPV6;
173 }
174
175 static bool link_ipv6_enabled(Link *link) {
176 assert(link);
177
178 if (!socket_ipv6_is_supported())
179 return false;
180
181 if (link->network->bond)
182 return false;
183
184 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
185 return false;
186
187 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
188 return false;
189
190 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
191 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
192 }
193
194 static bool link_radv_enabled(Link *link) {
195 assert(link);
196
197 if (!link_ipv6ll_enabled(link))
198 return false;
199
200 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
201 }
202
203 static bool link_ipv4_forward_enabled(Link *link) {
204 assert(link);
205
206 if (link->flags & IFF_LOOPBACK)
207 return false;
208
209 if (!link->network)
210 return false;
211
212 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
213 return false;
214
215 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
216 }
217
218 static bool link_ipv6_forward_enabled(Link *link) {
219 assert(link);
220
221 if (!socket_ipv6_is_supported())
222 return false;
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 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
234 return false;
235
236 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
237 }
238
239 static bool link_proxy_arp_enabled(Link *link) {
240 assert(link);
241
242 if (link->flags & IFF_LOOPBACK)
243 return false;
244
245 if (!link->network)
246 return false;
247
248 if (link->network->proxy_arp < 0)
249 return false;
250
251 return true;
252 }
253
254 static bool link_ipv6_accept_ra_enabled(Link *link) {
255 assert(link);
256
257 if (!socket_ipv6_is_supported())
258 return false;
259
260 if (link->flags & IFF_LOOPBACK)
261 return false;
262
263 if (!link->network)
264 return false;
265
266 if (!link_ipv6ll_enabled(link))
267 return false;
268
269 /* If unset use system default (enabled if local forwarding is disabled.
270 * disabled if local forwarding is enabled).
271 * If set, ignore or enforce RA independent of local forwarding state.
272 */
273 if (link->network->ipv6_accept_ra < 0)
274 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
275 return !link_ipv6_forward_enabled(link);
276 else if (link->network->ipv6_accept_ra > 0)
277 /* accept RA even if ip_forward is enabled */
278 return true;
279 else
280 /* ignore RA */
281 return false;
282 }
283
284 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
285 assert(link);
286
287 if (!socket_ipv6_is_supported())
288 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
289
290 if (link->flags & IFF_LOOPBACK)
291 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
292
293 if (!link->network)
294 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
295
296 return link->network->ipv6_privacy_extensions;
297 }
298
299 static int link_enable_ipv6(Link *link) {
300 bool disabled;
301 int r;
302
303 if (link->flags & IFF_LOOPBACK)
304 return 0;
305
306 disabled = !link_ipv6_enabled(link);
307
308 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", disabled);
309 if (r < 0)
310 log_link_warning_errno(link, r, "Cannot %s IPv6: %m", enable_disable(!disabled));
311 else
312 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
313
314 return 0;
315 }
316
317 static bool link_is_enslaved(Link *link) {
318 if (link->flags & IFF_SLAVE)
319 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
320 return true;
321
322 if (!link->network)
323 return false;
324
325 if (link->master_ifindex > 0 && link->network->bridge)
326 return true;
327
328 /* TODO: add conditions for other netdevs. */
329
330 return false;
331 }
332
333 static void link_update_master_operstate(Link *link, NetDev *netdev) {
334 Link *master;
335
336 if (!netdev)
337 return;
338
339 if (link_get(link->manager, netdev->ifindex, &master) < 0)
340 return;
341
342 link_update_operstate(master, true);
343 }
344
345 void link_update_operstate(Link *link, bool also_update_master) {
346 LinkOperationalState operstate;
347 Iterator i;
348
349 assert(link);
350
351 if (link->kernel_operstate == IF_OPER_DORMANT)
352 operstate = LINK_OPERSTATE_DORMANT;
353 else if (link_has_carrier(link)) {
354 Address *address;
355 uint8_t scope = RT_SCOPE_NOWHERE;
356
357 /* if we have carrier, check what addresses we have */
358 SET_FOREACH(address, link->addresses, i) {
359 if (!address_is_ready(address))
360 continue;
361
362 if (address->scope < scope)
363 scope = address->scope;
364 }
365
366 /* for operstate we also take foreign addresses into account */
367 SET_FOREACH(address, link->addresses_foreign, i) {
368 if (!address_is_ready(address))
369 continue;
370
371 if (address->scope < scope)
372 scope = address->scope;
373 }
374
375 if (scope < RT_SCOPE_SITE)
376 /* universally accessible addresses found */
377 operstate = LINK_OPERSTATE_ROUTABLE;
378 else if (scope < RT_SCOPE_HOST)
379 /* only link or site local addresses found */
380 operstate = LINK_OPERSTATE_DEGRADED;
381 else
382 /* no useful addresses found */
383 operstate = LINK_OPERSTATE_CARRIER;
384 } else if (link->flags & IFF_UP)
385 operstate = LINK_OPERSTATE_NO_CARRIER;
386 else
387 operstate = LINK_OPERSTATE_OFF;
388
389 if (IN_SET(operstate, LINK_OPERSTATE_DEGRADED, LINK_OPERSTATE_CARRIER) &&
390 link_is_enslaved(link))
391 operstate = LINK_OPERSTATE_ENSLAVED;
392
393 if (operstate >= LINK_OPERSTATE_CARRIER) {
394 Link *slave;
395
396 SET_FOREACH(slave, link->slaves, i) {
397 link_update_operstate(slave, false);
398
399 if (slave->operstate < LINK_OPERSTATE_CARRIER)
400 operstate = LINK_OPERSTATE_DEGRADED_CARRIER;
401 }
402 }
403
404 if (link->operstate != operstate) {
405 link->operstate = operstate;
406 link_send_changed(link, "OperationalState", NULL);
407 link_dirty(link);
408 }
409
410 if (also_update_master && link->network) {
411 link_update_master_operstate(link, link->network->bond);
412 link_update_master_operstate(link, link->network->bridge);
413 }
414 }
415
416 #define FLAG_STRING(string, flag, old, new) \
417 (((old ^ new) & flag) \
418 ? ((old & flag) ? (" -" string) : (" +" string)) \
419 : "")
420
421 static int link_update_flags(Link *link, sd_netlink_message *m, bool force_update_operstate) {
422 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
423 uint8_t operstate;
424 int r;
425
426 assert(link);
427
428 r = sd_rtnl_message_link_get_flags(m, &flags);
429 if (r < 0)
430 return log_link_warning_errno(link, r, "Could not get link flags: %m");
431
432 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
433 if (r < 0)
434 /* if we got a message without operstate, take it to mean
435 the state was unchanged */
436 operstate = link->kernel_operstate;
437
438 if (!force_update_operstate && (link->flags == flags) && (link->kernel_operstate == operstate))
439 return 0;
440
441 if (link->flags != flags) {
442 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",
443 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
444 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
445 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
446 FLAG_STRING("UP", IFF_UP, link->flags, flags),
447 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
448 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
449 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
450 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
451 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
452 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
453 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
454 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
455 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
456 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
457 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
458 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
459 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
460 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
461 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
462
463 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
464 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
465 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
466 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
467 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
468 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
469 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
470 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
471
472 /* link flags are currently at most 18 bits, let's align to
473 * printing 20 */
474 if (unknown_flags_added)
475 log_link_debug(link,
476 "Unknown link flags gained: %#.5x (ignoring)",
477 unknown_flags_added);
478
479 if (unknown_flags_removed)
480 log_link_debug(link,
481 "Unknown link flags lost: %#.5x (ignoring)",
482 unknown_flags_removed);
483 }
484
485 link->flags = flags;
486 link->kernel_operstate = operstate;
487
488 link_update_operstate(link, true);
489
490 return 0;
491 }
492
493 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
494 _cleanup_(link_unrefp) Link *link = NULL;
495 uint16_t type;
496 const char *ifname, *kind = NULL;
497 int r, ifindex;
498 unsigned short iftype;
499
500 assert(manager);
501 assert(message);
502 assert(ret);
503
504 /* check for link kind */
505 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
506 if (r == 0) {
507 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
508 r = sd_netlink_message_exit_container(message);
509 if (r < 0)
510 return r;
511 }
512
513 r = sd_netlink_message_get_type(message, &type);
514 if (r < 0)
515 return r;
516 else if (type != RTM_NEWLINK)
517 return -EINVAL;
518
519 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
520 if (r < 0)
521 return r;
522 else if (ifindex <= 0)
523 return -EINVAL;
524
525 r = sd_rtnl_message_link_get_type(message, &iftype);
526 if (r < 0)
527 return r;
528
529 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
530 if (r < 0)
531 return r;
532
533 link = new(Link, 1);
534 if (!link)
535 return -ENOMEM;
536
537 *link = (Link) {
538 .n_ref = 1,
539 .manager = manager,
540 .state = LINK_STATE_PENDING,
541 .rtnl_extended_attrs = true,
542 .ifindex = ifindex,
543 .iftype = iftype,
544 };
545
546 link->ifname = strdup(ifname);
547 if (!link->ifname)
548 return -ENOMEM;
549
550 if (kind) {
551 link->kind = strdup(kind);
552 if (!link->kind)
553 return -ENOMEM;
554 }
555
556 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
557 if (r < 0)
558 log_link_debug_errno(link, r, "New device has no master, continuing without");
559
560 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
561 if (r < 0)
562 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
563
564 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
565 return -ENOMEM;
566
567 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
568 return -ENOMEM;
569
570 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
571 return -ENOMEM;
572
573 r = hashmap_ensure_allocated(&manager->links, NULL);
574 if (r < 0)
575 return r;
576
577 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
578 if (r < 0)
579 return r;
580
581 r = link_update_flags(link, message, false);
582 if (r < 0)
583 return r;
584
585 *ret = TAKE_PTR(link);
586
587 return 0;
588 }
589
590 static Link *link_free(Link *link) {
591 Address *address;
592
593 assert(link);
594
595 link->routes = set_free_with_destructor(link->routes, route_free);
596 link->routes_foreign = set_free_with_destructor(link->routes_foreign, route_free);
597
598 link->addresses = set_free_with_destructor(link->addresses, address_free);
599 link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free);
600
601 while ((address = link->pool_addresses)) {
602 LIST_REMOVE(addresses, link->pool_addresses, address);
603 address_free(address);
604 }
605
606 sd_dhcp_server_unref(link->dhcp_server);
607 sd_dhcp_client_unref(link->dhcp_client);
608 sd_dhcp_lease_unref(link->dhcp_lease);
609
610 link_lldp_emit_stop(link);
611
612 free(link->lease_file);
613
614 sd_lldp_unref(link->lldp);
615 free(link->lldp_file);
616
617 ndisc_flush(link);
618
619 sd_ipv4ll_unref(link->ipv4ll);
620 sd_dhcp6_client_unref(link->dhcp6_client);
621 sd_ndisc_unref(link->ndisc);
622 sd_radv_unref(link->radv);
623
624 free(link->ifname);
625 free(link->kind);
626
627 (void) unlink(link->state_file);
628 free(link->state_file);
629
630 sd_device_unref(link->sd_device);
631
632 hashmap_free(link->bound_to_links);
633 hashmap_free(link->bound_by_links);
634
635 set_free_with_destructor(link->slaves, link_unref);
636
637 network_unref(link->network);
638
639 return mfree(link);
640 }
641
642 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
643
644 int link_get(Manager *m, int ifindex, Link **ret) {
645 Link *link;
646
647 assert(m);
648 assert(ifindex);
649 assert(ret);
650
651 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
652 if (!link)
653 return -ENODEV;
654
655 *ret = link;
656
657 return 0;
658 }
659
660 void link_set_state(Link *link, LinkState state) {
661 assert(link);
662
663 if (link->state == state)
664 return;
665
666 log_link_debug(link, "State changed: %s -> %s",
667 link_state_to_string(link->state),
668 link_state_to_string(state));
669
670 link->state = state;
671
672 link_send_changed(link, "AdministrativeState", NULL);
673 }
674
675 static void link_enter_unmanaged(Link *link) {
676 assert(link);
677
678 link_set_state(link, LINK_STATE_UNMANAGED);
679
680 link_dirty(link);
681 }
682
683 int link_stop_clients(Link *link, bool may_keep_dhcp) {
684 int r = 0, k;
685
686 assert(link);
687 assert(link->manager);
688 assert(link->manager->event);
689
690 dhcp4_release_old_lease(link);
691
692 if (link->dhcp_client && (!may_keep_dhcp || !link->network ||
693 !FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP))) {
694 k = sd_dhcp_client_stop(link->dhcp_client);
695 if (k < 0)
696 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
697 }
698
699 if (link->ipv4ll) {
700 k = sd_ipv4ll_stop(link->ipv4ll);
701 if (k < 0)
702 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
703 }
704
705 if (link->dhcp6_client) {
706 k = sd_dhcp6_client_stop(link->dhcp6_client);
707 if (k < 0)
708 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
709 }
710
711 if (link->ndisc) {
712 k = sd_ndisc_stop(link->ndisc);
713 if (k < 0)
714 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
715 }
716
717 if (link->radv) {
718 k = sd_radv_stop(link->radv);
719 if (k < 0)
720 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
721 }
722
723 link_lldp_emit_stop(link);
724 return r;
725 }
726
727 void link_enter_failed(Link *link) {
728 assert(link);
729
730 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
731 return;
732
733 log_link_warning(link, "Failed");
734
735 link_set_state(link, LINK_STATE_FAILED);
736
737 link_stop_clients(link, false);
738
739 link_dirty(link);
740 }
741
742 static Address* link_find_dhcp_server_address(Link *link) {
743 Address *address;
744
745 assert(link);
746 assert(link->network);
747
748 /* The first statically configured address if there is any */
749 LIST_FOREACH(addresses, address, link->network->static_addresses) {
750
751 if (address->family != AF_INET)
752 continue;
753
754 if (in_addr_is_null(address->family, &address->in_addr))
755 continue;
756
757 return address;
758 }
759
760 /* If that didn't work, find a suitable address we got from the pool */
761 LIST_FOREACH(addresses, address, link->pool_addresses) {
762 if (address->family != AF_INET)
763 continue;
764
765 return address;
766 }
767
768 return NULL;
769 }
770
771 static int link_join_netdevs_after_configured(Link *link) {
772 NetDev *netdev;
773 Iterator i;
774 int r;
775
776 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
777 if (netdev->ifindex > 0)
778 /* Assume already enslaved. */
779 continue;
780
781 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
782 continue;
783
784 log_struct(LOG_DEBUG,
785 LOG_LINK_INTERFACE(link),
786 LOG_NETDEV_INTERFACE(netdev),
787 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
788
789 r = netdev_join(netdev, link, NULL);
790 if (r < 0)
791 return log_struct_errno(LOG_WARNING, r,
792 LOG_LINK_INTERFACE(link),
793 LOG_NETDEV_INTERFACE(netdev),
794 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
795 }
796
797 return 0;
798 }
799
800 static void link_enter_configured(Link *link) {
801 assert(link);
802 assert(link->network);
803
804 if (link->state != LINK_STATE_CONFIGURING)
805 return;
806
807 log_link_info(link, "Configured");
808
809 link_set_state(link, LINK_STATE_CONFIGURED);
810
811 (void) link_join_netdevs_after_configured(link);
812
813 link_dirty(link);
814 }
815
816 static int link_request_set_routing_policy_rule(Link *link) {
817 RoutingPolicyRule *rule, *rrule = NULL;
818 int r;
819
820 assert(link);
821 assert(link->network);
822
823 link_set_state(link, LINK_STATE_CONFIGURING);
824 link->routing_policy_rules_configured = false;
825
826 LIST_FOREACH(rules, rule, link->network->rules) {
827 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
828 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif,
829 rule->protocol, &rule->sport, &rule->dport, &rrule);
830 if (r == 0) {
831 (void) routing_policy_rule_make_local(link->manager, rrule);
832 continue;
833 }
834
835 r = routing_policy_rule_configure(rule, link, NULL);
836 if (r < 0) {
837 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
838 link_enter_failed(link);
839 return r;
840 }
841
842 link->routing_policy_rule_messages++;
843 }
844
845 routing_policy_rule_purge(link->manager, link);
846 if (link->routing_policy_rule_messages == 0) {
847 link->routing_policy_rules_configured = true;
848 link_check_ready(link);
849 } else
850 log_link_debug(link, "Setting routing policy rules");
851
852 return 0;
853 }
854
855 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
856 int r;
857
858 assert(link);
859 assert(link->route_messages > 0);
860 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
861 LINK_STATE_FAILED, LINK_STATE_LINGER));
862
863 link->route_messages--;
864
865 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
866 return 1;
867
868 r = sd_netlink_message_get_errno(m);
869 if (r < 0 && r != -EEXIST)
870 log_link_warning_errno(link, r, "Could not set route: %m");
871
872 if (link->route_messages == 0) {
873 log_link_debug(link, "Routes set");
874 link->static_routes_configured = true;
875 link_check_ready(link);
876 }
877
878 return 1;
879 }
880
881 int link_request_set_routes(Link *link) {
882 enum {
883 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
884 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
885 _PHASE_MAX
886 } phase;
887 Route *rt;
888 int r;
889
890 assert(link);
891 assert(link->network);
892 assert(link->addresses_configured);
893 assert(link->address_messages == 0);
894 assert(link->state != _LINK_STATE_INVALID);
895
896 link_set_state(link, LINK_STATE_CONFIGURING);
897 link->static_routes_configured = false;
898
899 r = link_request_set_routing_policy_rule(link);
900 if (r < 0)
901 return r;
902
903 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
904 for (phase = 0; phase < _PHASE_MAX; phase++)
905 LIST_FOREACH(routes, rt, link->network->static_routes) {
906
907 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
908 continue;
909
910 r = route_configure(rt, link, route_handler);
911 if (r < 0) {
912 log_link_warning_errno(link, r, "Could not set routes: %m");
913 link_enter_failed(link);
914 return r;
915 }
916 if (r > 0)
917 link->route_messages++;
918 }
919
920 if (link->route_messages == 0) {
921 link->static_routes_configured = true;
922 link_check_ready(link);
923 } else
924 log_link_debug(link, "Setting routes");
925
926 return 0;
927 }
928
929 void link_check_ready(Link *link) {
930 Address *a;
931 Iterator i;
932
933 assert(link);
934
935 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
936 return;
937
938 if (!link->network)
939 return;
940
941 if (!link->addresses_configured)
942 return;
943
944 if (!link->neighbors_configured)
945 return;
946
947 SET_FOREACH(a, link->addresses, i)
948 if (!address_is_ready(a))
949 return;
950
951 if (!link->addresses_ready) {
952 link->addresses_ready = true;
953 link_request_set_routes(link);
954 return;
955 }
956
957 if (!link->static_routes_configured)
958 return;
959
960 if (!link->routing_policy_rules_configured)
961 return;
962
963 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !(link->ipv4ll_address && link->ipv4ll_route))
964 return;
965
966 if (link_ipv6ll_enabled(link) &&
967 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
968 return;
969
970 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
971 !link->dhcp4_configured &&
972 !link->dhcp6_configured &&
973 !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address && link->ipv4ll_route))
974 /* When DHCP is enabled, at least one protocol must provide an address, or
975 * an IPv4ll fallback address must be configured. */
976 return;
977
978 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
979 return;
980
981 if (link->state != LINK_STATE_CONFIGURED)
982 link_enter_configured(link);
983
984 return;
985 }
986
987 static int link_request_set_neighbors(Link *link) {
988 Neighbor *neighbor;
989 int r;
990
991 assert(link);
992 assert(link->network);
993 assert(link->state != _LINK_STATE_INVALID);
994
995 link_set_state(link, LINK_STATE_CONFIGURING);
996 link->neighbors_configured = false;
997
998 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
999 r = neighbor_configure(neighbor, link, NULL);
1000 if (r < 0) {
1001 log_link_warning_errno(link, r, "Could not set neighbor: %m");
1002 link_enter_failed(link);
1003 return r;
1004 }
1005 }
1006
1007 if (link->neighbor_messages == 0) {
1008 link->neighbors_configured = true;
1009 link_check_ready(link);
1010 } else
1011 log_link_debug(link, "Setting neighbors");
1012
1013 return 0;
1014 }
1015
1016 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1017 int r;
1018
1019 assert(rtnl);
1020 assert(m);
1021 assert(link);
1022 assert(link->ifname);
1023 assert(link->address_messages > 0);
1024 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1025 LINK_STATE_FAILED, LINK_STATE_LINGER));
1026
1027 link->address_messages--;
1028
1029 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1030 return 1;
1031
1032 r = sd_netlink_message_get_errno(m);
1033 if (r < 0 && r != -EEXIST)
1034 log_link_warning_errno(link, r, "could not set address: %m");
1035 else if (r >= 0)
1036 manager_rtnl_process_address(rtnl, m, link->manager);
1037
1038 if (link->address_messages == 0) {
1039 log_link_debug(link, "Addresses set");
1040 link->addresses_configured = true;
1041 link_check_ready(link);
1042 }
1043
1044 return 1;
1045 }
1046
1047 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1048 _cleanup_free_ struct in_addr *addresses = NULL;
1049 size_t n_addresses = 0, n_allocated = 0;
1050 unsigned i;
1051
1052 log_debug("Copying DNS server information from %s", link->ifname);
1053
1054 if (!link->network)
1055 return 0;
1056
1057 for (i = 0; i < link->network->n_dns; i++) {
1058 struct in_addr ia;
1059
1060 /* Only look for IPv4 addresses */
1061 if (link->network->dns[i].family != AF_INET)
1062 continue;
1063
1064 ia = link->network->dns[i].address.in;
1065
1066 /* Never propagate obviously borked data */
1067 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1068 continue;
1069
1070 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1071 return log_oom();
1072
1073 addresses[n_addresses++] = ia;
1074 }
1075
1076 if (link->network->dhcp_use_dns && link->dhcp_lease) {
1077 const struct in_addr *da = NULL;
1078 int j, n;
1079
1080 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
1081 if (n > 0) {
1082
1083 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1084 return log_oom();
1085
1086 for (j = 0; j < n; j++)
1087 if (in4_addr_is_non_local(&da[j]))
1088 addresses[n_addresses++] = da[j];
1089 }
1090 }
1091
1092 if (n_addresses <= 0)
1093 return 0;
1094
1095 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
1096 }
1097
1098 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1099 _cleanup_free_ struct in_addr *addresses = NULL;
1100 size_t n_addresses = 0, n_allocated = 0;
1101 char **a;
1102
1103 if (!link->network)
1104 return 0;
1105
1106 log_debug("Copying NTP server information from %s", link->ifname);
1107
1108 STRV_FOREACH(a, link->network->ntp) {
1109 union in_addr_union ia;
1110
1111 /* Only look for IPv4 addresses */
1112 if (in_addr_from_string(AF_INET, *a, &ia) <= 0)
1113 continue;
1114
1115 /* Never propagate obviously borked data */
1116 if (in4_addr_is_null(&ia.in) || in4_addr_is_localhost(&ia.in))
1117 continue;
1118
1119 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1120 return log_oom();
1121
1122 addresses[n_addresses++] = ia.in;
1123 }
1124
1125 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1126 const struct in_addr *da = NULL;
1127 int j, n;
1128
1129 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1130 if (n > 0) {
1131
1132 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1133 return log_oom();
1134
1135 for (j = 0; j < n; j++)
1136 if (in4_addr_is_non_local(&da[j]))
1137 addresses[n_addresses++] = da[j];
1138 }
1139 }
1140
1141 if (n_addresses <= 0)
1142 return 0;
1143
1144 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1145 }
1146
1147 static int link_set_bridge_fdb(Link *link) {
1148 FdbEntry *fdb_entry;
1149 int r;
1150
1151 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1152 r = fdb_entry_configure(link, fdb_entry);
1153 if (r < 0)
1154 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1155 }
1156
1157 return 0;
1158 }
1159
1160 static int link_request_set_addresses(Link *link) {
1161 AddressLabel *label;
1162 Address *ad;
1163 int r;
1164
1165 assert(link);
1166 assert(link->network);
1167 assert(link->state != _LINK_STATE_INVALID);
1168
1169 link_set_state(link, LINK_STATE_CONFIGURING);
1170
1171 /* Reset all *_configured flags we are configuring. */
1172 link->addresses_configured = false;
1173 link->addresses_ready = false;
1174 link->neighbors_configured = false;
1175 link->static_routes_configured = false;
1176 link->routing_policy_rules_configured = false;
1177
1178 r = link_set_bridge_fdb(link);
1179 if (r < 0)
1180 return r;
1181
1182 r = link_request_set_neighbors(link);
1183 if (r < 0)
1184 return r;
1185
1186 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1187 bool update;
1188
1189 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1190
1191 r = address_configure(ad, link, address_handler, update);
1192 if (r < 0) {
1193 log_link_warning_errno(link, r, "Could not set addresses: %m");
1194 link_enter_failed(link);
1195 return r;
1196 }
1197 if (r > 0)
1198 link->address_messages++;
1199 }
1200
1201 LIST_FOREACH(labels, label, link->network->address_labels) {
1202 r = address_label_configure(label, link, NULL, false);
1203 if (r < 0) {
1204 log_link_warning_errno(link, r, "Could not set address label: %m");
1205 link_enter_failed(link);
1206 return r;
1207 }
1208
1209 link->address_label_messages++;
1210 }
1211
1212 /* now that we can figure out a default address for the dhcp server,
1213 start it */
1214 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1215 Address *address;
1216 Link *uplink = NULL;
1217 bool acquired_uplink = false;
1218
1219 address = link_find_dhcp_server_address(link);
1220 if (!address) {
1221 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1222 link_enter_failed(link);
1223 return 0;
1224 }
1225
1226 /* use the server address' subnet as the pool */
1227 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1228 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1229 if (r < 0)
1230 return r;
1231
1232 /* TODO:
1233 r = sd_dhcp_server_set_router(link->dhcp_server,
1234 &main_address->in_addr.in);
1235 if (r < 0)
1236 return r;
1237 */
1238
1239 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1240 r = sd_dhcp_server_set_max_lease_time(
1241 link->dhcp_server,
1242 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1243 if (r < 0)
1244 return r;
1245 }
1246
1247 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1248 r = sd_dhcp_server_set_default_lease_time(
1249 link->dhcp_server,
1250 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1251 if (r < 0)
1252 return r;
1253 }
1254
1255 if (link->network->dhcp_server_emit_dns) {
1256
1257 if (link->network->n_dhcp_server_dns > 0)
1258 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1259 else {
1260 uplink = manager_find_uplink(link->manager, link);
1261 acquired_uplink = true;
1262
1263 if (!uplink) {
1264 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1265 r = 0;
1266 } else
1267 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1268 }
1269 if (r < 0)
1270 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1271 }
1272
1273 if (link->network->dhcp_server_emit_ntp) {
1274
1275 if (link->network->n_dhcp_server_ntp > 0)
1276 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1277 else {
1278 if (!acquired_uplink)
1279 uplink = manager_find_uplink(link->manager, link);
1280
1281 if (!uplink) {
1282 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1283 r = 0;
1284 } else
1285 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1286
1287 }
1288 if (r < 0)
1289 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1290 }
1291
1292 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1293 if (r < 0)
1294 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1295
1296 if (link->network->dhcp_server_emit_timezone) {
1297 _cleanup_free_ char *buffer = NULL;
1298 const char *tz = NULL;
1299
1300 if (link->network->dhcp_server_timezone)
1301 tz = link->network->dhcp_server_timezone;
1302 else {
1303 r = get_timezone(&buffer);
1304 if (r < 0)
1305 log_warning_errno(r, "Failed to determine timezone: %m");
1306 else
1307 tz = buffer;
1308 }
1309
1310 if (tz) {
1311 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1312 if (r < 0)
1313 return r;
1314 }
1315 }
1316 if (!sd_dhcp_server_is_running(link->dhcp_server)) {
1317 r = sd_dhcp_server_start(link->dhcp_server);
1318 if (r < 0) {
1319 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1320
1321 link_enter_failed(link);
1322
1323 return 0;
1324 }
1325 }
1326
1327 log_link_debug(link, "Offering DHCPv4 leases");
1328 }
1329
1330 if (link->address_messages == 0) {
1331 link->addresses_configured = true;
1332 link_check_ready(link);
1333 } else
1334 log_link_debug(link, "Setting addresses");
1335
1336 return 0;
1337 }
1338
1339 static int link_set_bridge_vlan(Link *link) {
1340 int r;
1341
1342 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1343 if (r < 0)
1344 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1345
1346 return r;
1347 }
1348
1349 static int link_set_proxy_arp(Link *link) {
1350 int r;
1351
1352 if (!link_proxy_arp_enabled(link))
1353 return 0;
1354
1355 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1356 if (r < 0)
1357 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1358
1359 return 0;
1360 }
1361
1362 static int link_configure_after_setting_mtu(Link *link);
1363
1364 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1365 int r;
1366
1367 assert(m);
1368 assert(link);
1369 assert(link->ifname);
1370
1371 link->setting_mtu = false;
1372
1373 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1374 return 1;
1375
1376 r = sd_netlink_message_get_errno(m);
1377 if (r < 0) {
1378 log_link_warning_errno(link, r, "Could not set MTU: %m");
1379 return 1;
1380 }
1381
1382 log_link_debug(link, "Setting MTU done.");
1383
1384 if (link->state == LINK_STATE_INITIALIZED)
1385 (void) link_configure_after_setting_mtu(link);
1386
1387 return 1;
1388 }
1389
1390 int link_set_mtu(Link *link, uint32_t mtu) {
1391 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1392 int r;
1393
1394 assert(link);
1395 assert(link->manager);
1396 assert(link->manager->rtnl);
1397
1398 if (mtu == 0 || link->setting_mtu)
1399 return 0;
1400
1401 if (link->mtu == mtu)
1402 return 0;
1403
1404 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1405
1406 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1407 if (r < 0)
1408 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1409
1410 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1411 * for this interface, then disable IPv6 else enable it. */
1412 (void) link_enable_ipv6(link);
1413
1414 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1415 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1416 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1417
1418 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1419 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1420
1421 mtu = IPV6_MIN_MTU;
1422 }
1423
1424 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1425 if (r < 0)
1426 return log_link_error_errno(link, r, "Could not append MTU: %m");
1427
1428 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1429 link_netlink_destroy_callback, link);
1430 if (r < 0)
1431 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1432
1433 link_ref(link);
1434 link->setting_mtu = true;
1435
1436 return 0;
1437 }
1438
1439 static bool link_reduces_vlan_mtu(Link *link) {
1440 /* See netif_reduces_vlan_mtu() in kernel. */
1441 return streq_ptr(link->kind, "macsec");
1442 }
1443
1444 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1445 uint32_t mtu = 0;
1446 NetDev *dev;
1447 Iterator i;
1448
1449 HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1450 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1451 /* See vlan_dev_change_mtu() in kernel. */
1452 mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1453
1454 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1455 /* See macvlan_change_mtu() in kernel. */
1456 mtu = dev->mtu;
1457
1458 return mtu;
1459 }
1460
1461 static int link_configure_mtu(Link *link) {
1462 uint32_t mtu;
1463
1464 assert(link);
1465 assert(link->network);
1466
1467 if (link->network->mtu > 0)
1468 return link_set_mtu(link, link->network->mtu);
1469
1470 mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1471 if (link->mtu >= mtu)
1472 return 0;
1473
1474 log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1475 "If it is not desired, then please explicitly specify MTUBytes= setting.",
1476 link->mtu, mtu);
1477
1478 return link_set_mtu(link, mtu);
1479 }
1480
1481 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1482 int r;
1483
1484 assert(m);
1485 assert(link);
1486 assert(link->ifname);
1487
1488 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1489 return 1;
1490
1491 r = sd_netlink_message_get_errno(m);
1492 if (r < 0)
1493 log_link_warning_errno(link, r, "Could not set link flags: %m");
1494
1495 return 1;
1496 }
1497
1498 static int link_set_flags(Link *link) {
1499 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1500 unsigned ifi_change = 0;
1501 unsigned ifi_flags = 0;
1502 int r;
1503
1504 assert(link);
1505 assert(link->manager);
1506 assert(link->manager->rtnl);
1507
1508 if (link->flags & IFF_LOOPBACK)
1509 return 0;
1510
1511 if (!link->network)
1512 return 0;
1513
1514 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1515 return 0;
1516
1517 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1518 if (r < 0)
1519 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1520
1521 if (link->network->arp >= 0) {
1522 ifi_change |= IFF_NOARP;
1523 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1524 }
1525
1526 if (link->network->multicast >= 0) {
1527 ifi_change |= IFF_MULTICAST;
1528 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1529 }
1530
1531 if (link->network->allmulticast >= 0) {
1532 ifi_change |= IFF_ALLMULTI;
1533 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1534 }
1535
1536 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1537 if (r < 0)
1538 return log_link_error_errno(link, r, "Could not set link flags: %m");
1539
1540 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1541 link_netlink_destroy_callback, link);
1542 if (r < 0)
1543 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1544
1545 link_ref(link);
1546
1547 return 0;
1548 }
1549
1550 static int link_acquire_ipv6_conf(Link *link) {
1551 int r;
1552
1553 assert(link);
1554
1555 if (link_ipv6_accept_ra_enabled(link)) {
1556 assert(link->ndisc);
1557
1558 log_link_debug(link, "Discovering IPv6 routers");
1559
1560 r = sd_ndisc_start(link->ndisc);
1561 if (r < 0 && r != -EBUSY)
1562 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1563 }
1564
1565 if (link_radv_enabled(link)) {
1566 assert(link->radv);
1567 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1568
1569 log_link_debug(link, "Starting IPv6 Router Advertisements");
1570
1571 r = sd_radv_start(link->radv);
1572 if (r < 0 && r != -EBUSY)
1573 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1574 }
1575
1576 (void) dhcp6_request_prefix_delegation(link);
1577
1578 return 0;
1579 }
1580
1581 static int link_acquire_ipv4_conf(Link *link) {
1582 int r;
1583
1584 assert(link);
1585 assert(link->manager);
1586 assert(link->manager->event);
1587
1588 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1589 assert(link->ipv4ll);
1590
1591 log_link_debug(link, "Acquiring IPv4 link-local address");
1592
1593 r = sd_ipv4ll_start(link->ipv4ll);
1594 if (r < 0)
1595 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1596 }
1597
1598 if (link_dhcp4_enabled(link)) {
1599 assert(link->dhcp_client);
1600
1601 log_link_debug(link, "Acquiring DHCPv4 lease");
1602
1603 r = sd_dhcp_client_start(link->dhcp_client);
1604 if (r < 0)
1605 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1606 }
1607
1608 return 0;
1609 }
1610
1611 static int link_acquire_conf(Link *link) {
1612 int r;
1613
1614 assert(link);
1615
1616 r = link_acquire_ipv4_conf(link);
1617 if (r < 0)
1618 return r;
1619
1620 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1621 r = link_acquire_ipv6_conf(link);
1622 if (r < 0)
1623 return r;
1624 }
1625
1626 if (link_lldp_emit_enabled(link)) {
1627 r = link_lldp_emit_start(link);
1628 if (r < 0)
1629 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1630 }
1631
1632 return 0;
1633 }
1634
1635 bool link_has_carrier(Link *link) {
1636 /* see Documentation/networking/operstates.txt in the kernel sources */
1637
1638 if (link->kernel_operstate == IF_OPER_UP)
1639 return true;
1640
1641 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1642 /* operstate may not be implemented, so fall back to flags */
1643 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1644 !FLAGS_SET(link->flags, IFF_DORMANT))
1645 return true;
1646
1647 return false;
1648 }
1649
1650 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1651 int r;
1652
1653 assert(link);
1654
1655 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1656 return 1;
1657
1658 r = sd_netlink_message_get_errno(m);
1659 if (r < 0)
1660 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1661
1662 return 1;
1663 }
1664
1665 static int link_configure_addrgen_mode(Link *link) {
1666 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1667 uint8_t ipv6ll_mode;
1668 int r;
1669
1670 assert(link);
1671 assert(link->network);
1672 assert(link->manager);
1673 assert(link->manager->rtnl);
1674
1675 if (!socket_ipv6_is_supported())
1676 return 0;
1677
1678 log_link_debug(link, "Setting address genmode for link");
1679
1680 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1681 if (r < 0)
1682 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1683
1684 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1685 if (r < 0)
1686 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1687
1688 r = sd_netlink_message_open_container(req, AF_INET6);
1689 if (r < 0)
1690 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1691
1692 if (!link_ipv6ll_enabled(link))
1693 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1694 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1695 /* The file may not exist. And event if it exists, when stable_secret is unset,
1696 * reading the file fails with EIO. */
1697 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1698 else
1699 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1700
1701 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1702 if (r < 0)
1703 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1704
1705 r = sd_netlink_message_close_container(req);
1706 if (r < 0)
1707 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1708
1709 r = sd_netlink_message_close_container(req);
1710 if (r < 0)
1711 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1712
1713 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1714 link_netlink_destroy_callback, link);
1715 if (r < 0)
1716 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1717
1718 link_ref(link);
1719
1720 return 0;
1721 }
1722
1723 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1724 int r;
1725
1726 assert(link);
1727
1728 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1729 return 1;
1730
1731 r = sd_netlink_message_get_errno(m);
1732 if (r < 0)
1733 /* we warn but don't fail the link, as it may be brought up later */
1734 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1735
1736 return 1;
1737 }
1738
1739 static int link_up(Link *link) {
1740 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1741 int r;
1742
1743 assert(link);
1744 assert(link->network);
1745 assert(link->manager);
1746 assert(link->manager->rtnl);
1747
1748 log_link_debug(link, "Bringing link up");
1749
1750 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1751 if (r < 0)
1752 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1753
1754 /* set it free if not enslaved with networkd */
1755 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1756 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1757 if (r < 0)
1758 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1759 }
1760
1761 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1762 if (r < 0)
1763 return log_link_error_errno(link, r, "Could not set link flags: %m");
1764
1765 if (link->network->mac) {
1766 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1767 if (r < 0)
1768 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1769 }
1770
1771 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1772 link_netlink_destroy_callback, link);
1773 if (r < 0)
1774 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1775
1776 link_ref(link);
1777
1778 return 0;
1779 }
1780
1781 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1782 int r;
1783
1784 assert(link);
1785
1786 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1787 return 1;
1788
1789 r = sd_netlink_message_get_errno(m);
1790 if (r < 0)
1791 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1792
1793 return 1;
1794 }
1795
1796 int link_down(Link *link, link_netlink_message_handler_t callback) {
1797 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1798 int r;
1799
1800 assert(link);
1801 assert(link->manager);
1802 assert(link->manager->rtnl);
1803
1804 log_link_debug(link, "Bringing link down");
1805
1806 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1807 RTM_SETLINK, link->ifindex);
1808 if (r < 0)
1809 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1810
1811 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1812 if (r < 0)
1813 return log_link_error_errno(link, r, "Could not set link flags: %m");
1814
1815 r = netlink_call_async(link->manager->rtnl, NULL, req,
1816 callback ?: link_down_handler,
1817 link_netlink_destroy_callback, link);
1818 if (r < 0)
1819 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1820
1821 link_ref(link);
1822
1823 return 0;
1824 }
1825
1826 static int link_handle_bound_to_list(Link *link) {
1827 Link *l;
1828 Iterator i;
1829 int r;
1830 bool required_up = false;
1831 bool link_is_up = false;
1832
1833 assert(link);
1834
1835 if (hashmap_isempty(link->bound_to_links))
1836 return 0;
1837
1838 if (link->flags & IFF_UP)
1839 link_is_up = true;
1840
1841 HASHMAP_FOREACH (l, link->bound_to_links, i)
1842 if (link_has_carrier(l)) {
1843 required_up = true;
1844 break;
1845 }
1846
1847 if (!required_up && link_is_up) {
1848 r = link_down(link, NULL);
1849 if (r < 0)
1850 return r;
1851 } else if (required_up && !link_is_up) {
1852 r = link_up(link);
1853 if (r < 0)
1854 return r;
1855 }
1856
1857 return 0;
1858 }
1859
1860 static int link_handle_bound_by_list(Link *link) {
1861 Iterator i;
1862 Link *l;
1863 int r;
1864
1865 assert(link);
1866
1867 if (hashmap_isempty(link->bound_by_links))
1868 return 0;
1869
1870 HASHMAP_FOREACH (l, link->bound_by_links, i) {
1871 r = link_handle_bound_to_list(l);
1872 if (r < 0)
1873 return r;
1874 }
1875
1876 return 0;
1877 }
1878
1879 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1880 int r;
1881
1882 assert(link);
1883 assert(carrier);
1884
1885 if (link == carrier)
1886 return 0;
1887
1888 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1889 return 0;
1890
1891 r = hashmap_ensure_allocated(h, NULL);
1892 if (r < 0)
1893 return r;
1894
1895 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1896 if (r < 0)
1897 return r;
1898
1899 return 0;
1900 }
1901
1902 static int link_new_bound_by_list(Link *link) {
1903 Manager *m;
1904 Link *carrier;
1905 Iterator i;
1906 int r;
1907 bool list_updated = false;
1908
1909 assert(link);
1910 assert(link->manager);
1911
1912 m = link->manager;
1913
1914 HASHMAP_FOREACH(carrier, m->links, i) {
1915 if (!carrier->network)
1916 continue;
1917
1918 if (strv_isempty(carrier->network->bind_carrier))
1919 continue;
1920
1921 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
1922 r = link_put_carrier(link, carrier, &link->bound_by_links);
1923 if (r < 0)
1924 return r;
1925
1926 list_updated = true;
1927 }
1928 }
1929
1930 if (list_updated)
1931 link_dirty(link);
1932
1933 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
1934 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1935 if (r < 0)
1936 return r;
1937
1938 link_dirty(carrier);
1939 }
1940
1941 return 0;
1942 }
1943
1944 static int link_new_bound_to_list(Link *link) {
1945 Manager *m;
1946 Link *carrier;
1947 Iterator i;
1948 int r;
1949 bool list_updated = false;
1950
1951 assert(link);
1952 assert(link->manager);
1953
1954 if (!link->network)
1955 return 0;
1956
1957 if (strv_isempty(link->network->bind_carrier))
1958 return 0;
1959
1960 m = link->manager;
1961
1962 HASHMAP_FOREACH (carrier, m->links, i) {
1963 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
1964 r = link_put_carrier(link, carrier, &link->bound_to_links);
1965 if (r < 0)
1966 return r;
1967
1968 list_updated = true;
1969 }
1970 }
1971
1972 if (list_updated)
1973 link_dirty(link);
1974
1975 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
1976 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
1977 if (r < 0)
1978 return r;
1979
1980 link_dirty(carrier);
1981 }
1982
1983 return 0;
1984 }
1985
1986 static int link_new_carrier_maps(Link *link) {
1987 int r;
1988
1989 r = link_new_bound_by_list(link);
1990 if (r < 0)
1991 return r;
1992
1993 r = link_handle_bound_by_list(link);
1994 if (r < 0)
1995 return r;
1996
1997 r = link_new_bound_to_list(link);
1998 if (r < 0)
1999 return r;
2000
2001 r = link_handle_bound_to_list(link);
2002 if (r < 0)
2003 return r;
2004
2005 return 0;
2006 }
2007
2008 static void link_free_bound_to_list(Link *link) {
2009 Link *bound_to;
2010 Iterator i;
2011
2012 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2013 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2014
2015 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2016 link_dirty(bound_to);
2017 }
2018
2019 return;
2020 }
2021
2022 static void link_free_bound_by_list(Link *link) {
2023 Link *bound_by;
2024 Iterator i;
2025
2026 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2027 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2028
2029 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2030 link_dirty(bound_by);
2031 link_handle_bound_to_list(bound_by);
2032 }
2033 }
2034
2035 return;
2036 }
2037
2038 static void link_free_carrier_maps(Link *link) {
2039 bool list_updated = false;
2040
2041 assert(link);
2042
2043 if (!hashmap_isempty(link->bound_to_links)) {
2044 link_free_bound_to_list(link);
2045 list_updated = true;
2046 }
2047
2048 if (!hashmap_isempty(link->bound_by_links)) {
2049 link_free_bound_by_list(link);
2050 list_updated = true;
2051 }
2052
2053 if (list_updated)
2054 link_dirty(link);
2055
2056 return;
2057 }
2058
2059 static int link_append_to_master(Link *link, NetDev *netdev) {
2060 Link *master;
2061 int r;
2062
2063 assert(link);
2064 assert(netdev);
2065
2066 r = link_get(link->manager, netdev->ifindex, &master);
2067 if (r < 0)
2068 return r;
2069
2070 r = set_ensure_allocated(&master->slaves, NULL);
2071 if (r < 0)
2072 return r;
2073
2074 r = set_put(master->slaves, link);
2075 if (r < 0)
2076 return r;
2077
2078 link_ref(link);
2079 return 0;
2080 }
2081
2082 static void link_drop_from_master(Link *link, NetDev *netdev) {
2083 Link *master;
2084
2085 assert(link);
2086
2087 if (!link->manager || !netdev)
2088 return;
2089
2090 if (link_get(link->manager, netdev->ifindex, &master) < 0)
2091 return;
2092
2093 link_unref(set_remove(master->slaves, link));
2094 }
2095
2096 static void link_detach_from_manager(Link *link) {
2097 if (!link || !link->manager)
2098 return;
2099
2100 link_unref(set_remove(link->manager->links_requesting_uuid, link));
2101 link_clean(link);
2102
2103 /* The following must be called at last. */
2104 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2105 link_unref(link);
2106 }
2107
2108 void link_drop(Link *link) {
2109 if (!link || link->state == LINK_STATE_LINGER)
2110 return;
2111
2112 link_set_state(link, LINK_STATE_LINGER);
2113
2114 link_free_carrier_maps(link);
2115
2116 if (link->network) {
2117 link_drop_from_master(link, link->network->bridge);
2118 link_drop_from_master(link, link->network->bond);
2119 }
2120
2121 log_link_debug(link, "Link removed");
2122
2123 (void) unlink(link->state_file);
2124 link_detach_from_manager(link);
2125 }
2126
2127 static int link_joined(Link *link) {
2128 int r;
2129
2130 assert(link);
2131 assert(link->network);
2132
2133 if (!hashmap_isempty(link->bound_to_links)) {
2134 r = link_handle_bound_to_list(link);
2135 if (r < 0)
2136 return r;
2137 } else if (!(link->flags & IFF_UP)) {
2138 r = link_up(link);
2139 if (r < 0) {
2140 link_enter_failed(link);
2141 return r;
2142 }
2143 }
2144
2145 if (link->network->bridge) {
2146 r = link_set_bridge(link);
2147 if (r < 0)
2148 log_link_error_errno(link, r, "Could not set bridge message: %m");
2149
2150 r = link_append_to_master(link, link->network->bridge);
2151 if (r < 0)
2152 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2153 }
2154
2155 if (link->network->bond) {
2156 r = link_set_bond(link);
2157 if (r < 0)
2158 log_link_error_errno(link, r, "Could not set bond message: %m");
2159
2160 r = link_append_to_master(link, link->network->bond);
2161 if (r < 0)
2162 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2163 }
2164
2165 if (link->network->use_br_vlan &&
2166 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2167 r = link_set_bridge_vlan(link);
2168 if (r < 0)
2169 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2170 }
2171
2172 /* Skip setting up addresses until it gets carrier,
2173 or it would try to set addresses twice,
2174 which is bad for non-idempotent steps. */
2175 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2176 return 0;
2177
2178 return link_request_set_addresses(link);
2179 }
2180
2181 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2182 int r;
2183
2184 assert(link);
2185 assert(link->network);
2186 assert(link->enslaving > 0);
2187
2188 link->enslaving--;
2189
2190 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2191 return 1;
2192
2193 r = sd_netlink_message_get_errno(m);
2194 if (r < 0 && r != -EEXIST) {
2195 log_link_error_errno(link, r, "Could not join netdev: %m");
2196 link_enter_failed(link);
2197 return 1;
2198 } else
2199 log_link_debug(link, "Joined netdev");
2200
2201 if (link->enslaving == 0) {
2202 link_joined(link);
2203 }
2204
2205 return 1;
2206 }
2207
2208 static int link_enter_join_netdev(Link *link) {
2209 NetDev *netdev;
2210 Iterator i;
2211 int r;
2212
2213 assert(link);
2214 assert(link->network);
2215 assert(link->state == LINK_STATE_INITIALIZED);
2216
2217 link_set_state(link, LINK_STATE_CONFIGURING);
2218
2219 link_dirty(link);
2220 link->enslaving = 0;
2221
2222 if (link->network->bond) {
2223 if (link->network->bond->state == NETDEV_STATE_READY &&
2224 link->network->bond->ifindex == link->master_ifindex)
2225 return link_joined(link);
2226
2227 log_struct(LOG_DEBUG,
2228 LOG_LINK_INTERFACE(link),
2229 LOG_NETDEV_INTERFACE(link->network->bond),
2230 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2231
2232 link->enslaving++;
2233
2234 r = netdev_join(link->network->bond, link, netdev_join_handler);
2235 if (r < 0) {
2236 log_struct_errno(LOG_WARNING, r,
2237 LOG_LINK_INTERFACE(link),
2238 LOG_NETDEV_INTERFACE(link->network->bond),
2239 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2240 link_enter_failed(link);
2241 return r;
2242 }
2243 }
2244
2245 if (link->network->bridge) {
2246 log_struct(LOG_DEBUG,
2247 LOG_LINK_INTERFACE(link),
2248 LOG_NETDEV_INTERFACE(link->network->bridge),
2249 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2250
2251 link->enslaving++;
2252
2253 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2254 if (r < 0) {
2255 log_struct_errno(LOG_WARNING, r,
2256 LOG_LINK_INTERFACE(link),
2257 LOG_NETDEV_INTERFACE(link->network->bridge),
2258 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2259 link_enter_failed(link);
2260 return r;
2261 }
2262 }
2263
2264 if (link->network->vrf) {
2265 log_struct(LOG_DEBUG,
2266 LOG_LINK_INTERFACE(link),
2267 LOG_NETDEV_INTERFACE(link->network->vrf),
2268 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2269
2270 link->enslaving++;
2271
2272 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2273 if (r < 0) {
2274 log_struct_errno(LOG_WARNING, r,
2275 LOG_LINK_INTERFACE(link),
2276 LOG_NETDEV_INTERFACE(link->network->vrf),
2277 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2278 link_enter_failed(link);
2279 return r;
2280 }
2281 }
2282
2283 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2284
2285 if (netdev->ifindex > 0)
2286 /* Assume already enslaved. */
2287 continue;
2288
2289 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2290 continue;
2291
2292 log_struct(LOG_DEBUG,
2293 LOG_LINK_INTERFACE(link),
2294 LOG_NETDEV_INTERFACE(netdev),
2295 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2296
2297 link->enslaving++;
2298
2299 r = netdev_join(netdev, link, netdev_join_handler);
2300 if (r < 0) {
2301 log_struct_errno(LOG_WARNING, r,
2302 LOG_LINK_INTERFACE(link),
2303 LOG_NETDEV_INTERFACE(netdev),
2304 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2305 link_enter_failed(link);
2306 return r;
2307 }
2308 }
2309
2310 if (link->enslaving == 0)
2311 return link_joined(link);
2312
2313 return 0;
2314 }
2315
2316 static int link_set_ipv4_forward(Link *link) {
2317 int r;
2318
2319 if (!link_ipv4_forward_enabled(link))
2320 return 0;
2321
2322 /* We propagate the forwarding flag from one interface to the
2323 * global setting one way. This means: as long as at least one
2324 * interface was configured at any time that had IP forwarding
2325 * enabled the setting will stay on for good. We do this
2326 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2327 * somewhat in sync (see below). */
2328
2329 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2330 if (r < 0)
2331 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2332
2333 return 0;
2334 }
2335
2336 static int link_set_ipv6_forward(Link *link) {
2337 int r;
2338
2339 if (!link_ipv6_forward_enabled(link))
2340 return 0;
2341
2342 /* On Linux, the IPv6 stack does not know a per-interface
2343 * packet forwarding setting: either packet forwarding is on
2344 * for all, or off for all. We hence don't bother with a
2345 * per-interface setting, but simply propagate the interface
2346 * flag, if it is set, to the global flag, one-way. Note that
2347 * while IPv4 would allow a per-interface flag, we expose the
2348 * same behaviour there and also propagate the setting from
2349 * one to all, to keep things simple (see above). */
2350
2351 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2352 if (r < 0)
2353 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2354
2355 return 0;
2356 }
2357
2358 static int link_set_ipv6_privacy_extensions(Link *link) {
2359 IPv6PrivacyExtensions s;
2360 int r;
2361
2362 s = link_ipv6_privacy_extensions(link);
2363 if (s < 0)
2364 return 0;
2365
2366 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2367 if (r < 0)
2368 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2369
2370 return 0;
2371 }
2372
2373 static int link_set_ipv6_accept_ra(Link *link) {
2374 int r;
2375
2376 /* Make this a NOP if IPv6 is not available */
2377 if (!socket_ipv6_is_supported())
2378 return 0;
2379
2380 if (link->flags & IFF_LOOPBACK)
2381 return 0;
2382
2383 if (!link->network)
2384 return 0;
2385
2386 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2387 if (r < 0)
2388 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2389
2390 return 0;
2391 }
2392
2393 static int link_set_ipv6_dad_transmits(Link *link) {
2394 int r;
2395
2396 /* Make this a NOP if IPv6 is not available */
2397 if (!socket_ipv6_is_supported())
2398 return 0;
2399
2400 if (link->flags & IFF_LOOPBACK)
2401 return 0;
2402
2403 if (!link->network)
2404 return 0;
2405
2406 if (link->network->ipv6_dad_transmits < 0)
2407 return 0;
2408
2409 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2410 if (r < 0)
2411 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2412
2413 return 0;
2414 }
2415
2416 static int link_set_ipv6_hop_limit(Link *link) {
2417 int r;
2418
2419 /* Make this a NOP if IPv6 is not available */
2420 if (!socket_ipv6_is_supported())
2421 return 0;
2422
2423 if (link->flags & IFF_LOOPBACK)
2424 return 0;
2425
2426 if (!link->network)
2427 return 0;
2428
2429 if (link->network->ipv6_hop_limit < 0)
2430 return 0;
2431
2432 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2433 if (r < 0)
2434 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2435
2436 return 0;
2437 }
2438
2439 static int link_set_ipv6_mtu(Link *link) {
2440 int r;
2441
2442 /* Make this a NOP if IPv6 is not available */
2443 if (!socket_ipv6_is_supported())
2444 return 0;
2445
2446 if (link->flags & IFF_LOOPBACK)
2447 return 0;
2448
2449 if (link->network->ipv6_mtu == 0)
2450 return 0;
2451
2452 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2453 if (r < 0)
2454 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2455
2456 return 0;
2457 }
2458
2459 static bool link_is_static_address_configured(Link *link, Address *address) {
2460 Address *net_address;
2461
2462 assert(link);
2463 assert(address);
2464
2465 if (!link->network)
2466 return false;
2467
2468 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2469 if (address_equal(net_address, address))
2470 return true;
2471
2472 return false;
2473 }
2474
2475 static bool link_is_static_route_configured(Link *link, Route *route) {
2476 Route *net_route;
2477
2478 assert(link);
2479 assert(route);
2480
2481 if (!link->network)
2482 return false;
2483
2484 LIST_FOREACH(routes, net_route, link->network->static_routes)
2485 if (route_equal(net_route, route))
2486 return true;
2487
2488 return false;
2489 }
2490
2491 static bool link_address_is_dynamic(Link *link, Address *address) {
2492 Route *route;
2493 Iterator i;
2494
2495 assert(link);
2496 assert(address);
2497
2498 if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2499 return true;
2500
2501 /* Even when the address is leased from a DHCP server, networkd assign the address
2502 * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2503 * corresponding routes with RTPROT_DHCP. */
2504 SET_FOREACH(route, link->routes_foreign, i) {
2505 if (route->protocol != RTPROT_DHCP)
2506 continue;
2507
2508 if (address->family != route->family)
2509 continue;
2510
2511 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2512 return true;
2513 }
2514
2515 return false;
2516 }
2517
2518 static int link_drop_foreign_config(Link *link) {
2519 Address *address;
2520 Route *route;
2521 Iterator i;
2522 int r;
2523
2524 SET_FOREACH(address, link->addresses_foreign, i) {
2525 /* we consider IPv6LL addresses to be managed by the kernel */
2526 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2527 continue;
2528
2529 if (link_address_is_dynamic(link, address)) {
2530 if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2531 continue;
2532 } else if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2533 continue;
2534
2535 if (link_is_static_address_configured(link, address)) {
2536 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2537 if (r < 0)
2538 return log_link_error_errno(link, r, "Failed to add address: %m");
2539 } else {
2540 r = address_remove(address, link, NULL);
2541 if (r < 0)
2542 return r;
2543 }
2544 }
2545
2546 SET_FOREACH(route, link->routes_foreign, i) {
2547 /* do not touch routes managed by the kernel */
2548 if (route->protocol == RTPROT_KERNEL)
2549 continue;
2550
2551 if (route->protocol == RTPROT_STATIC &&
2552 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2553 continue;
2554
2555 if (route->protocol == RTPROT_DHCP &&
2556 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2557 continue;
2558
2559 if (link_is_static_route_configured(link, route)) {
2560 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2561 if (r < 0)
2562 return r;
2563 } else {
2564 r = route_remove(route, link, NULL);
2565 if (r < 0)
2566 return r;
2567 }
2568 }
2569
2570 return 0;
2571 }
2572
2573 static int link_drop_config(Link *link) {
2574 Address *address, *pool_address;
2575 Route *route;
2576 Iterator i;
2577 int r;
2578
2579 SET_FOREACH(address, link->addresses, i) {
2580 /* we consider IPv6LL addresses to be managed by the kernel */
2581 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2582 continue;
2583
2584 r = address_remove(address, link, NULL);
2585 if (r < 0)
2586 return r;
2587
2588 /* If this address came from an address pool, clean up the pool */
2589 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2590 if (address_equal(address, pool_address)) {
2591 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2592 address_free(pool_address);
2593 break;
2594 }
2595 }
2596 }
2597
2598 SET_FOREACH(route, link->routes, i) {
2599 /* do not touch routes managed by the kernel */
2600 if (route->protocol == RTPROT_KERNEL)
2601 continue;
2602
2603 r = route_remove(route, link, NULL);
2604 if (r < 0)
2605 return r;
2606 }
2607
2608 ndisc_flush(link);
2609
2610 return 0;
2611 }
2612
2613 static int link_configure(Link *link) {
2614 int r;
2615
2616 assert(link);
2617 assert(link->network);
2618 assert(link->state == LINK_STATE_INITIALIZED);
2619
2620 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
2621 return link_configure_can(link);
2622
2623 /* Drop foreign config, but ignore loopback or critical devices.
2624 * We do not want to remove loopback address or addresses used for root NFS. */
2625 if (!(link->flags & IFF_LOOPBACK) &&
2626 link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
2627 r = link_drop_foreign_config(link);
2628 if (r < 0)
2629 return r;
2630 }
2631
2632 r = link_set_proxy_arp(link);
2633 if (r < 0)
2634 return r;
2635
2636 r = ipv6_proxy_ndp_addresses_configure(link);
2637 if (r < 0)
2638 return r;
2639
2640 r = link_set_ipv4_forward(link);
2641 if (r < 0)
2642 return r;
2643
2644 r = link_set_ipv6_forward(link);
2645 if (r < 0)
2646 return r;
2647
2648 r = link_set_ipv6_privacy_extensions(link);
2649 if (r < 0)
2650 return r;
2651
2652 r = link_set_ipv6_accept_ra(link);
2653 if (r < 0)
2654 return r;
2655
2656 r = link_set_ipv6_dad_transmits(link);
2657 if (r < 0)
2658 return r;
2659
2660 r = link_set_ipv6_hop_limit(link);
2661 if (r < 0)
2662 return r;
2663
2664 r = link_set_flags(link);
2665 if (r < 0)
2666 return r;
2667
2668 r = link_set_ipv6_mtu(link);
2669 if (r < 0)
2670 return r;
2671
2672 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
2673 r = ipv4ll_configure(link);
2674 if (r < 0)
2675 return r;
2676 }
2677
2678 if (link_dhcp4_enabled(link)) {
2679 r = dhcp4_set_promote_secondaries(link);
2680 if (r < 0)
2681 return r;
2682
2683 r = dhcp4_configure(link);
2684 if (r < 0)
2685 return r;
2686 }
2687
2688 if (link_dhcp4_server_enabled(link)) {
2689 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2690 if (r < 0)
2691 return r;
2692
2693 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2694 if (r < 0)
2695 return r;
2696 }
2697
2698 if (link_dhcp6_enabled(link) ||
2699 link_ipv6_accept_ra_enabled(link)) {
2700 r = dhcp6_configure(link);
2701 if (r < 0)
2702 return r;
2703 }
2704
2705 if (link_ipv6_accept_ra_enabled(link)) {
2706 r = ndisc_configure(link);
2707 if (r < 0)
2708 return r;
2709 }
2710
2711 if (link_radv_enabled(link)) {
2712 r = radv_configure(link);
2713 if (r < 0)
2714 return r;
2715 }
2716
2717 if (link_lldp_rx_enabled(link)) {
2718 r = link_lldp_rx_configure(link);
2719 if (r < 0)
2720 return r;
2721 }
2722
2723 r = link_configure_mtu(link);
2724 if (r < 0)
2725 return r;
2726
2727 r = link_configure_addrgen_mode(link);
2728 if (r < 0)
2729 return r;
2730
2731 return link_configure_after_setting_mtu(link);
2732 }
2733
2734 static int link_configure_after_setting_mtu(Link *link) {
2735 int r;
2736
2737 assert(link);
2738 assert(link->network);
2739 assert(link->state == LINK_STATE_INITIALIZED);
2740
2741 if (link->setting_mtu)
2742 return 0;
2743
2744 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2745 r = link_acquire_conf(link);
2746 if (r < 0)
2747 return r;
2748 }
2749
2750 return link_enter_join_netdev(link);
2751 }
2752
2753 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
2754 assert(duid);
2755
2756 if (duid->raw_data_len > 0)
2757 return 0;
2758
2759 if (duid->type != DUID_TYPE_UUID)
2760 return -EINVAL;
2761
2762 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
2763 duid->raw_data_len = sizeof(sd_id128_t);
2764
2765 return 1;
2766 }
2767
2768 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
2769 Manager *manager = userdata;
2770 const sd_bus_error *e;
2771 const void *a;
2772 size_t sz;
2773 DUID *duid;
2774 Link *link;
2775 int r;
2776
2777 assert(m);
2778 assert(manager);
2779
2780 e = sd_bus_message_get_error(m);
2781 if (e) {
2782 log_error_errno(sd_bus_error_get_errno(e),
2783 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
2784 e->message);
2785 goto configure;
2786 }
2787
2788 r = sd_bus_message_read_array(m, 'y', &a, &sz);
2789 if (r < 0)
2790 goto configure;
2791
2792 if (sz != sizeof(sd_id128_t)) {
2793 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
2794 goto configure;
2795 }
2796
2797 memcpy(&manager->product_uuid, a, sz);
2798 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
2799 (void) duid_set_uuid(duid, manager->product_uuid);
2800
2801 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
2802
2803 configure:
2804 while ((link = set_steal_first(manager->links_requesting_uuid))) {
2805 r = link_configure(link);
2806 if (r < 0)
2807 log_link_error_errno(link, r, "Failed to configure link: %m");
2808 }
2809
2810 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
2811
2812 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
2813 * even if the method fails. */
2814 manager->has_product_uuid = true;
2815
2816 return 1;
2817 }
2818
2819 static bool link_requires_uuid(Link *link) {
2820 const DUID *duid;
2821
2822 assert(link);
2823 assert(link->manager);
2824 assert(link->network);
2825
2826 duid = link_get_duid(link);
2827 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
2828 return false;
2829
2830 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
2831 return true;
2832
2833 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
2834 return true;
2835
2836 return false;
2837 }
2838
2839 static int link_configure_duid(Link *link) {
2840 Manager *m;
2841 DUID *duid;
2842 int r;
2843
2844 assert(link);
2845 assert(link->manager);
2846 assert(link->network);
2847
2848 m = link->manager;
2849 duid = link_get_duid(link);
2850
2851 if (!link_requires_uuid(link))
2852 return 1;
2853
2854 if (m->has_product_uuid) {
2855 (void) duid_set_uuid(duid, m->product_uuid);
2856 return 1;
2857 }
2858
2859 if (!m->links_requesting_uuid) {
2860 r = manager_request_product_uuid(m, link);
2861 if (r < 0) {
2862 if (r == -ENOMEM)
2863 return r;
2864
2865 log_link_warning_errno(link, r,
2866 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
2867 return 1;
2868 }
2869 } else {
2870 r = set_put(m->links_requesting_uuid, link);
2871 if (r < 0)
2872 return log_oom();
2873
2874 r = set_put(m->duids_requesting_uuid, duid);
2875 if (r < 0)
2876 return log_oom();
2877 }
2878
2879 return 0;
2880 }
2881
2882 static int link_initialized_and_synced(Link *link) {
2883 Network *network;
2884 int r;
2885
2886 assert(link);
2887 assert(link->ifname);
2888 assert(link->manager);
2889
2890 /* We may get called either from the asynchronous netlink callback,
2891 * or directly for link_add() if running in a container. See link_add(). */
2892 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
2893 return 0;
2894
2895 log_link_debug(link, "Link state is up-to-date");
2896 link_set_state(link, LINK_STATE_INITIALIZED);
2897
2898 r = link_new_bound_by_list(link);
2899 if (r < 0)
2900 return r;
2901
2902 r = link_handle_bound_by_list(link);
2903 if (r < 0)
2904 return r;
2905
2906 if (!link->network) {
2907 r = network_get(link->manager, link->sd_device, link->ifname,
2908 &link->mac, &network);
2909 if (r == -ENOENT) {
2910 link_enter_unmanaged(link);
2911 return 0;
2912 } else if (r == 0 && network->unmanaged) {
2913 link_enter_unmanaged(link);
2914 return 0;
2915 } else if (r < 0)
2916 return r;
2917
2918 if (link->flags & IFF_LOOPBACK) {
2919 if (network->link_local != ADDRESS_FAMILY_NO)
2920 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2921
2922 if (network->dhcp != ADDRESS_FAMILY_NO)
2923 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2924
2925 if (network->dhcp_server)
2926 log_link_debug(link, "Ignoring DHCP server for loopback link");
2927 }
2928
2929 r = network_apply(network, link);
2930 if (r < 0)
2931 return r;
2932 }
2933
2934 r = link_new_bound_to_list(link);
2935 if (r < 0)
2936 return r;
2937
2938 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
2939 * link_configure() is called later asynchronously. */
2940 r = link_configure_duid(link);
2941 if (r <= 0)
2942 return r;
2943
2944 r = link_configure(link);
2945 if (r < 0)
2946 return r;
2947
2948 return 0;
2949 }
2950
2951 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2952 (void) link_initialized_and_synced(link);
2953 return 1;
2954 }
2955
2956 int link_initialized(Link *link, sd_device *device) {
2957 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2958 int r;
2959
2960 assert(link);
2961 assert(link->manager);
2962 assert(link->manager->rtnl);
2963 assert(device);
2964
2965 if (link->state != LINK_STATE_PENDING)
2966 return 0;
2967
2968 if (link->sd_device)
2969 return 0;
2970
2971 log_link_debug(link, "udev initialized link");
2972 link_set_state(link, LINK_STATE_INITIALIZED);
2973
2974 link->sd_device = sd_device_ref(device);
2975
2976 /* udev has initialized the link, but we don't know if we have yet
2977 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2978 * when it returns we know that the pending NEWLINKs have already been
2979 * processed and that we are up-to-date */
2980
2981 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2982 link->ifindex);
2983 if (r < 0)
2984 return r;
2985
2986 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
2987 link_netlink_destroy_callback, link);
2988 if (r < 0)
2989 return r;
2990
2991 link_ref(link);
2992
2993 return 0;
2994 }
2995
2996 static int link_load(Link *link) {
2997 _cleanup_free_ char *network_file = NULL,
2998 *addresses = NULL,
2999 *routes = NULL,
3000 *dhcp4_address = NULL,
3001 *ipv4ll_address = NULL;
3002 union in_addr_union address;
3003 union in_addr_union route_dst;
3004 const char *p;
3005 int r;
3006
3007 assert(link);
3008
3009 r = parse_env_file(NULL, link->state_file,
3010 "NETWORK_FILE", &network_file,
3011 "ADDRESSES", &addresses,
3012 "ROUTES", &routes,
3013 "DHCP4_ADDRESS", &dhcp4_address,
3014 "IPV4LL_ADDRESS", &ipv4ll_address);
3015 if (r < 0 && r != -ENOENT)
3016 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3017
3018 if (network_file) {
3019 Network *network;
3020 char *suffix;
3021
3022 /* drop suffix */
3023 suffix = strrchr(network_file, '.');
3024 if (!suffix) {
3025 log_link_debug(link, "Failed to get network name from %s", network_file);
3026 goto network_file_fail;
3027 }
3028 *suffix = '\0';
3029
3030 r = network_get_by_name(link->manager, basename(network_file), &network);
3031 if (r < 0) {
3032 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3033 goto network_file_fail;
3034 }
3035
3036 r = network_apply(network, link);
3037 if (r < 0)
3038 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3039 }
3040
3041 network_file_fail:
3042
3043 if (addresses) {
3044 p = addresses;
3045
3046 for (;;) {
3047 _cleanup_free_ char *address_str = NULL;
3048 char *prefixlen_str;
3049 int family;
3050 unsigned char prefixlen;
3051
3052 r = extract_first_word(&p, &address_str, NULL, 0);
3053 if (r < 0) {
3054 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3055 continue;
3056 }
3057 if (r == 0)
3058 break;
3059
3060 prefixlen_str = strchr(address_str, '/');
3061 if (!prefixlen_str) {
3062 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3063 continue;
3064 }
3065
3066 *prefixlen_str++ = '\0';
3067
3068 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3069 if (r != 1) {
3070 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3071 continue;
3072 }
3073
3074 r = in_addr_from_string_auto(address_str, &family, &address);
3075 if (r < 0) {
3076 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3077 continue;
3078 }
3079
3080 r = address_add(link, family, &address, prefixlen, NULL);
3081 if (r < 0)
3082 return log_link_error_errno(link, r, "Failed to add address: %m");
3083 }
3084 }
3085
3086 if (routes) {
3087 p = routes;
3088
3089 for (;;) {
3090 Route *route;
3091 _cleanup_free_ char *route_str = NULL;
3092 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3093 usec_t lifetime;
3094 char *prefixlen_str;
3095 int family;
3096 unsigned char prefixlen, tos, table;
3097 uint32_t priority;
3098
3099 r = extract_first_word(&p, &route_str, NULL, 0);
3100 if (r < 0) {
3101 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3102 continue;
3103 }
3104 if (r == 0)
3105 break;
3106
3107 prefixlen_str = strchr(route_str, '/');
3108 if (!prefixlen_str) {
3109 log_link_debug(link, "Failed to parse route %s", route_str);
3110 continue;
3111 }
3112
3113 *prefixlen_str++ = '\0';
3114
3115 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3116 if (r != 5) {
3117 log_link_debug(link,
3118 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3119 prefixlen_str);
3120 continue;
3121 }
3122
3123 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3124 if (r < 0) {
3125 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3126 continue;
3127 }
3128
3129 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3130 if (r < 0)
3131 return log_link_error_errno(link, r, "Failed to add route: %m");
3132
3133 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3134 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3135 0, route_expire_handler, route);
3136 if (r < 0)
3137 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3138 }
3139
3140 route->lifetime = lifetime;
3141 sd_event_source_unref(route->expire);
3142 route->expire = TAKE_PTR(expire);
3143 }
3144 }
3145
3146 if (dhcp4_address) {
3147 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3148 if (r < 0) {
3149 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3150 goto dhcp4_address_fail;
3151 }
3152
3153 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3154 if (r < 0)
3155 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3156
3157 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3158 if (r < 0)
3159 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3160 }
3161
3162 dhcp4_address_fail:
3163
3164 if (ipv4ll_address) {
3165 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3166 if (r < 0) {
3167 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3168 goto ipv4ll_address_fail;
3169 }
3170
3171 r = sd_ipv4ll_new(&link->ipv4ll);
3172 if (r < 0)
3173 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3174
3175 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3176 if (r < 0)
3177 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3178 }
3179
3180 ipv4ll_address_fail:
3181
3182 return 0;
3183 }
3184
3185 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3186 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3187 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3188 Link *link;
3189 int r;
3190
3191 assert(m);
3192 assert(m->rtnl);
3193 assert(message);
3194 assert(ret);
3195
3196 r = link_new(m, message, ret);
3197 if (r < 0)
3198 return r;
3199
3200 link = *ret;
3201
3202 log_link_debug(link, "Link %d added", link->ifindex);
3203
3204 r = link_load(link);
3205 if (r < 0)
3206 return r;
3207
3208 if (detect_container() <= 0) {
3209 /* not in a container, udev will be around */
3210 sprintf(ifindex_str, "n%d", link->ifindex);
3211 r = sd_device_new_from_device_id(&device, ifindex_str);
3212 if (r < 0) {
3213 log_link_warning_errno(link, r, "Could not find device: %m");
3214 goto failed;
3215 }
3216
3217 r = sd_device_get_is_initialized(device);
3218 if (r < 0) {
3219 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3220 goto failed;
3221 }
3222 if (r == 0) {
3223 /* not yet ready */
3224 log_link_debug(link, "link pending udev initialization...");
3225 return 0;
3226 }
3227
3228 r = device_is_renaming(device);
3229 if (r < 0) {
3230 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3231 goto failed;
3232 }
3233 if (r > 0) {
3234 log_link_debug(link, "Interface is under renaming, pending initialization.");
3235 return 0;
3236 }
3237
3238 r = link_initialized(link, device);
3239 if (r < 0)
3240 goto failed;
3241 } else {
3242 r = link_initialized_and_synced(link);
3243 if (r < 0)
3244 goto failed;
3245 }
3246
3247 return 0;
3248 failed:
3249 link_enter_failed(link);
3250 return r;
3251 }
3252
3253 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3254 int r;
3255
3256 assert(link);
3257
3258 log_link_info(link, "Gained IPv6LL");
3259
3260 link->ipv6ll_address = *address;
3261 link_check_ready(link);
3262
3263 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3264 r = link_acquire_ipv6_conf(link);
3265 if (r < 0) {
3266 link_enter_failed(link);
3267 return r;
3268 }
3269 }
3270
3271 return 0;
3272 }
3273
3274 static int link_carrier_gained(Link *link) {
3275 int r;
3276
3277 assert(link);
3278
3279 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3280 r = link_acquire_conf(link);
3281 if (r < 0) {
3282 link_enter_failed(link);
3283 return r;
3284 }
3285
3286 r = link_request_set_addresses(link);
3287 if (r < 0)
3288 return r;
3289 }
3290
3291 r = link_handle_bound_by_list(link);
3292 if (r < 0)
3293 return r;
3294
3295 return 0;
3296 }
3297
3298 static int link_carrier_lost(Link *link) {
3299 int r;
3300
3301 assert(link);
3302
3303 if (link->network && link->network->ignore_carrier_loss)
3304 return 0;
3305
3306 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3307 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3308 * configuration and stop the clients as well. */
3309 if (link->setting_mtu)
3310 return 0;
3311
3312 r = link_stop_clients(link, false);
3313 if (r < 0) {
3314 link_enter_failed(link);
3315 return r;
3316 }
3317
3318 if (link_dhcp4_server_enabled(link))
3319 (void) sd_dhcp_server_stop(link->dhcp_server);
3320
3321 r = link_drop_config(link);
3322 if (r < 0)
3323 return r;
3324
3325 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3326 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3327 r = link_drop_foreign_config(link);
3328 if (r < 0)
3329 return r;
3330 }
3331
3332 r = link_handle_bound_by_list(link);
3333 if (r < 0)
3334 return r;
3335
3336 return 0;
3337 }
3338
3339 int link_carrier_reset(Link *link) {
3340 int r;
3341
3342 assert(link);
3343
3344 if (link_has_carrier(link)) {
3345 r = link_carrier_lost(link);
3346 if (r < 0)
3347 return r;
3348
3349 r = link_carrier_gained(link);
3350 if (r < 0)
3351 return r;
3352
3353 log_link_info(link, "Reset carrier");
3354 }
3355
3356 return 0;
3357 }
3358
3359 int link_update(Link *link, sd_netlink_message *m) {
3360 struct ether_addr mac;
3361 const char *ifname;
3362 uint32_t mtu;
3363 bool had_carrier, carrier_gained, carrier_lost;
3364 int old_master, r;
3365
3366 assert(link);
3367 assert(link->ifname);
3368 assert(m);
3369
3370 if (link->state == LINK_STATE_LINGER) {
3371 log_link_info(link, "Link re-added");
3372 link_set_state(link, LINK_STATE_CONFIGURING);
3373
3374 r = link_new_carrier_maps(link);
3375 if (r < 0)
3376 return r;
3377 }
3378
3379 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3380 if (r >= 0 && !streq(ifname, link->ifname)) {
3381 Manager *manager = link->manager;
3382
3383 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3384
3385 link_drop(link);
3386 r = link_add(manager, m, &link);
3387 if (r < 0)
3388 return r;
3389 }
3390
3391 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3392 if (r >= 0 && mtu > 0) {
3393 link->mtu = mtu;
3394 if (link->original_mtu == 0) {
3395 link->original_mtu = mtu;
3396 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3397 }
3398
3399 if (link->dhcp_client) {
3400 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3401 link->mtu);
3402 if (r < 0)
3403 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3404 }
3405
3406 if (link->radv) {
3407 r = sd_radv_set_mtu(link->radv, link->mtu);
3408 if (r < 0)
3409 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3410 }
3411 }
3412
3413 /* The kernel may broadcast NEWLINK messages without the MAC address
3414 set, simply ignore them. */
3415 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3416 if (r >= 0) {
3417 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3418 ETH_ALEN)) {
3419
3420 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3421 ETH_ALEN);
3422
3423 log_link_debug(link, "MAC address: "
3424 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3425 mac.ether_addr_octet[0],
3426 mac.ether_addr_octet[1],
3427 mac.ether_addr_octet[2],
3428 mac.ether_addr_octet[3],
3429 mac.ether_addr_octet[4],
3430 mac.ether_addr_octet[5]);
3431
3432 if (link->ipv4ll) {
3433 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3434 if (r < 0)
3435 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3436 }
3437
3438 if (link->dhcp_client) {
3439 r = sd_dhcp_client_set_mac(link->dhcp_client,
3440 (const uint8_t *) &link->mac,
3441 sizeof (link->mac),
3442 ARPHRD_ETHER);
3443 if (r < 0)
3444 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3445
3446 r = dhcp4_set_client_identifier(link);
3447 if (r < 0)
3448 return r;
3449 }
3450
3451 if (link->dhcp6_client) {
3452 const DUID* duid = link_get_duid(link);
3453
3454 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3455 (const uint8_t *) &link->mac,
3456 sizeof (link->mac),
3457 ARPHRD_ETHER);
3458 if (r < 0)
3459 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3460
3461 if (link->network->iaid_set) {
3462 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3463 link->network->iaid);
3464 if (r < 0)
3465 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3466 }
3467
3468 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3469 duid->type,
3470 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3471 duid->raw_data_len);
3472 if (r < 0)
3473 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3474 }
3475
3476 if (link->radv) {
3477 r = sd_radv_set_mac(link->radv, &link->mac);
3478 if (r < 0)
3479 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3480 }
3481
3482 if (link->ndisc) {
3483 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3484 if (r < 0)
3485 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3486 }
3487 }
3488 }
3489
3490 old_master = link->master_ifindex;
3491 (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
3492
3493 had_carrier = link_has_carrier(link);
3494
3495 r = link_update_flags(link, m, old_master != link->master_ifindex);
3496 if (r < 0)
3497 return r;
3498
3499 r = link_update_lldp(link);
3500 if (r < 0)
3501 return r;
3502
3503 carrier_gained = !had_carrier && link_has_carrier(link);
3504 carrier_lost = had_carrier && !link_has_carrier(link);
3505
3506 if (carrier_gained) {
3507 log_link_info(link, "Gained carrier");
3508
3509 r = link_carrier_gained(link);
3510 if (r < 0)
3511 return r;
3512 } else if (carrier_lost) {
3513 log_link_info(link, "Lost carrier");
3514
3515 r = link_carrier_lost(link);
3516 if (r < 0)
3517 return r;
3518 }
3519
3520 return 0;
3521 }
3522
3523 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3524 bool space = false;
3525 Iterator i;
3526 Link *link;
3527
3528 assert(f);
3529 assert(prefix);
3530
3531 if (hashmap_isempty(h))
3532 return;
3533
3534 fputs(prefix, f);
3535 HASHMAP_FOREACH(link, h, i) {
3536 if (space)
3537 fputc(' ', f);
3538
3539 fprintf(f, "%i", link->ifindex);
3540 space = true;
3541 }
3542
3543 fputc('\n', f);
3544 }
3545
3546 int link_save(Link *link) {
3547 _cleanup_free_ char *temp_path = NULL;
3548 _cleanup_fclose_ FILE *f = NULL;
3549 const char *admin_state, *oper_state;
3550 Address *a;
3551 Route *route;
3552 Iterator i;
3553 int r;
3554
3555 assert(link);
3556 assert(link->state_file);
3557 assert(link->lease_file);
3558 assert(link->manager);
3559
3560 if (link->state == LINK_STATE_LINGER) {
3561 (void) unlink(link->state_file);
3562 return 0;
3563 }
3564
3565 link_lldp_save(link);
3566
3567 admin_state = link_state_to_string(link->state);
3568 assert(admin_state);
3569
3570 oper_state = link_operstate_to_string(link->operstate);
3571 assert(oper_state);
3572
3573 r = fopen_temporary(link->state_file, &f, &temp_path);
3574 if (r < 0)
3575 goto fail;
3576
3577 (void) fchmod(fileno(f), 0644);
3578
3579 fprintf(f,
3580 "# This is private data. Do not parse.\n"
3581 "ADMIN_STATE=%s\n"
3582 "OPER_STATE=%s\n",
3583 admin_state, oper_state);
3584
3585 if (link->network) {
3586 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
3587 const char *dhcp_domainname = NULL, *p;
3588 sd_dhcp6_lease *dhcp6_lease = NULL;
3589 unsigned j;
3590 bool space;
3591
3592 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3593 yes_no(link->network->required_for_online));
3594
3595 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
3596 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
3597
3598 if (link->dhcp6_client) {
3599 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3600 if (r < 0 && r != -ENOMSG)
3601 log_link_debug(link, "No DHCPv6 lease");
3602 }
3603
3604 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3605
3606 fputs("DNS=", f);
3607 space = false;
3608
3609 for (j = 0; j < link->network->n_dns; j++) {
3610 _cleanup_free_ char *b = NULL;
3611
3612 r = in_addr_to_string(link->network->dns[j].family,
3613 &link->network->dns[j].address, &b);
3614 if (r < 0) {
3615 log_debug_errno(r, "Failed to format address, ignoring: %m");
3616 continue;
3617 }
3618
3619 if (space)
3620 fputc(' ', f);
3621 fputs(b, f);
3622 space = true;
3623 }
3624
3625 if (link->network->dhcp_use_dns &&
3626 link->dhcp_lease) {
3627 const struct in_addr *addresses;
3628
3629 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3630 if (r > 0)
3631 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3632 space = true;
3633 }
3634
3635 if (link->network->dhcp_use_dns && dhcp6_lease) {
3636 struct in6_addr *in6_addrs;
3637
3638 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3639 if (r > 0) {
3640 if (space)
3641 fputc(' ', f);
3642 serialize_in6_addrs(f, in6_addrs, r);
3643 space = true;
3644 }
3645 }
3646
3647 /* Make sure to flush out old entries before we use the NDISC data */
3648 ndisc_vacuum(link);
3649
3650 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3651 NDiscRDNSS *dd;
3652
3653 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3654 if (space)
3655 fputc(' ', f);
3656
3657 serialize_in6_addrs(f, &dd->address, 1);
3658 space = true;
3659 }
3660 }
3661
3662 fputc('\n', f);
3663
3664 fputs("NTP=", f);
3665 space = false;
3666 fputstrv(f, link->network->ntp, NULL, &space);
3667
3668 if (link->network->dhcp_use_ntp &&
3669 link->dhcp_lease) {
3670 const struct in_addr *addresses;
3671
3672 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3673 if (r > 0)
3674 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3675 space = true;
3676 }
3677
3678 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3679 struct in6_addr *in6_addrs;
3680 char **hosts;
3681
3682 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3683 &in6_addrs);
3684 if (r > 0) {
3685 if (space)
3686 fputc(' ', f);
3687 serialize_in6_addrs(f, in6_addrs, r);
3688 space = true;
3689 }
3690
3691 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3692 if (r > 0)
3693 fputstrv(f, hosts, NULL, &space);
3694 }
3695
3696 fputc('\n', f);
3697
3698 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3699 if (link->dhcp_lease) {
3700 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3701 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3702 }
3703 if (dhcp6_lease)
3704 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3705 }
3706
3707 fputs("DOMAINS=", f);
3708 space = false;
3709 ORDERED_SET_FOREACH(p, link->network->search_domains, i)
3710 fputs_with_space(f, p, NULL, &space);
3711
3712 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3713 NDiscDNSSL *dd;
3714
3715 if (dhcp_domainname)
3716 fputs_with_space(f, dhcp_domainname, NULL, &space);
3717 if (dhcp_domains)
3718 fputstrv(f, dhcp_domains, NULL, &space);
3719 if (dhcp6_domains)
3720 fputstrv(f, dhcp6_domains, NULL, &space);
3721
3722 SET_FOREACH(dd, link->ndisc_dnssl, i)
3723 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3724 }
3725
3726 fputc('\n', f);
3727
3728 fputs("ROUTE_DOMAINS=", f);
3729 space = false;
3730 ORDERED_SET_FOREACH(p, link->network->route_domains, i)
3731 fputs_with_space(f, p, NULL, &space);
3732
3733 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3734 NDiscDNSSL *dd;
3735
3736 if (dhcp_domainname)
3737 fputs_with_space(f, dhcp_domainname, NULL, &space);
3738 if (dhcp_domains)
3739 fputstrv(f, dhcp_domains, NULL, &space);
3740 if (dhcp6_domains)
3741 fputstrv(f, dhcp6_domains, NULL, &space);
3742
3743 SET_FOREACH(dd, link->ndisc_dnssl, i)
3744 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3745 }
3746
3747 fputc('\n', f);
3748
3749 fprintf(f, "LLMNR=%s\n",
3750 resolve_support_to_string(link->network->llmnr));
3751 fprintf(f, "MDNS=%s\n",
3752 resolve_support_to_string(link->network->mdns));
3753 if (link->network->dns_default_route >= 0)
3754 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
3755
3756 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3757 fprintf(f, "DNS_OVER_TLS=%s\n",
3758 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
3759
3760 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3761 fprintf(f, "DNSSEC=%s\n",
3762 dnssec_mode_to_string(link->network->dnssec_mode));
3763
3764 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3765 const char *n;
3766
3767 fputs("DNSSEC_NTA=", f);
3768 space = false;
3769 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3770 fputs_with_space(f, n, NULL, &space);
3771 fputc('\n', f);
3772 }
3773
3774 fputs("ADDRESSES=", f);
3775 space = false;
3776 SET_FOREACH(a, link->addresses, i) {
3777 _cleanup_free_ char *address_str = NULL;
3778
3779 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3780 if (r < 0)
3781 goto fail;
3782
3783 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3784 space = true;
3785 }
3786 fputc('\n', f);
3787
3788 fputs("ROUTES=", f);
3789 space = false;
3790 SET_FOREACH(route, link->routes, i) {
3791 _cleanup_free_ char *route_str = NULL;
3792
3793 r = in_addr_to_string(route->family, &route->dst, &route_str);
3794 if (r < 0)
3795 goto fail;
3796
3797 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
3798 space ? " " : "", route_str,
3799 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3800 space = true;
3801 }
3802
3803 fputc('\n', f);
3804 }
3805
3806 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3807 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3808
3809 if (link->dhcp_lease) {
3810 struct in_addr address;
3811 const char *tz = NULL;
3812
3813 assert(link->network);
3814
3815 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3816 if (r >= 0)
3817 fprintf(f, "TIMEZONE=%s\n", tz);
3818
3819 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3820 if (r >= 0) {
3821 fputs("DHCP4_ADDRESS=", f);
3822 serialize_in_addrs(f, &address, 1, false, NULL);
3823 fputc('\n', f);
3824 }
3825
3826 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3827 if (r < 0)
3828 goto fail;
3829
3830 fprintf(f,
3831 "DHCP_LEASE=%s\n",
3832 link->lease_file);
3833 } else
3834 (void) unlink(link->lease_file);
3835
3836 if (link->ipv4ll) {
3837 struct in_addr address;
3838
3839 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3840 if (r >= 0) {
3841 fputs("IPV4LL_ADDRESS=", f);
3842 serialize_in_addrs(f, &address, 1, false, NULL);
3843 fputc('\n', f);
3844 }
3845 }
3846
3847 r = fflush_and_check(f);
3848 if (r < 0)
3849 goto fail;
3850
3851 if (rename(temp_path, link->state_file) < 0) {
3852 r = -errno;
3853 goto fail;
3854 }
3855
3856 return 0;
3857
3858 fail:
3859 (void) unlink(link->state_file);
3860 if (temp_path)
3861 (void) unlink(temp_path);
3862
3863 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3864 }
3865
3866 /* The serialized state in /run is no longer up-to-date. */
3867 void link_dirty(Link *link) {
3868 int r;
3869
3870 assert(link);
3871
3872 /* mark manager dirty as link is dirty */
3873 manager_dirty(link->manager);
3874
3875 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3876 if (r < 0)
3877 /* allocation errors are ignored */
3878 return;
3879
3880 r = set_put(link->manager->dirty_links, link);
3881 if (r <= 0)
3882 /* don't take another ref if the link was already dirty */
3883 return;
3884
3885 link_ref(link);
3886 }
3887
3888 /* The serialized state in /run is up-to-date */
3889 void link_clean(Link *link) {
3890 assert(link);
3891 assert(link->manager);
3892
3893 link_unref(set_remove(link->manager->dirty_links, link));
3894 }
3895
3896 static const char* const link_state_table[_LINK_STATE_MAX] = {
3897 [LINK_STATE_PENDING] = "pending",
3898 [LINK_STATE_INITIALIZED] = "initialized",
3899 [LINK_STATE_CONFIGURING] = "configuring",
3900 [LINK_STATE_CONFIGURED] = "configured",
3901 [LINK_STATE_UNMANAGED] = "unmanaged",
3902 [LINK_STATE_FAILED] = "failed",
3903 [LINK_STATE_LINGER] = "linger",
3904 };
3905
3906 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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