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