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Merge pull request #12645 from poettering/journal-mmap-einval
[thirdparty/systemd.git] / src / network / networkd-link.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <netinet/in.h>
4 #include <linux/if.h>
5 #include <unistd.h>
6
7 #include "alloc-util.h"
8 #include "bus-util.h"
9 #include "dhcp-identifier.h"
10 #include "dhcp-lease-internal.h"
11 #include "env-file.h"
12 #include "fd-util.h"
13 #include "fileio.h"
14 #include "missing_network.h"
15 #include "netdev/bond.h"
16 #include "netdev/bridge.h"
17 #include "netdev/ipvlan.h"
18 #include "netdev/vrf.h"
19 #include "netlink-util.h"
20 #include "network-internal.h"
21 #include "networkd-can.h"
22 #include "networkd-ipv6-proxy-ndp.h"
23 #include "networkd-lldp-tx.h"
24 #include "networkd-manager.h"
25 #include "networkd-ndisc.h"
26 #include "networkd-neighbor.h"
27 #include "networkd-radv.h"
28 #include "networkd-routing-policy-rule.h"
29 #include "set.h"
30 #include "socket-util.h"
31 #include "stdio-util.h"
32 #include "string-table.h"
33 #include "strv.h"
34 #include "sysctl-util.h"
35 #include "tmpfile-util.h"
36 #include "udev-util.h"
37 #include "util.h"
38 #include "virt.h"
39
40 uint32_t link_get_vrf_table(Link *link) {
41 return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
42 }
43
44 uint32_t link_get_dhcp_route_table(Link *link) {
45 /* When the interface is part of an VRF use the VRFs routing table, unless
46 * another table is explicitly specified. */
47 if (link->network->dhcp_route_table_set)
48 return link->network->dhcp_route_table;
49 return link_get_vrf_table(link);
50 }
51
52 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
53 if (link->network->ipv6_accept_ra_route_table_set)
54 return link->network->ipv6_accept_ra_route_table;
55 return link_get_vrf_table(link);
56 }
57
58 DUID* link_get_duid(Link *link) {
59 if (link->network->duid.type != _DUID_TYPE_INVALID)
60 return &link->network->duid;
61 else
62 return &link->manager->duid;
63 }
64
65 static bool link_dhcp6_enabled(Link *link) {
66 assert(link);
67
68 if (!socket_ipv6_is_supported())
69 return false;
70
71 if (link->flags & IFF_LOOPBACK)
72 return false;
73
74 if (!link->network)
75 return false;
76
77 if (link->network->bond)
78 return false;
79
80 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
81 return false;
82
83 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
84 return false;
85
86 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
87 }
88
89 static bool link_dhcp4_enabled(Link *link) {
90 assert(link);
91
92 if (link->flags & IFF_LOOPBACK)
93 return false;
94
95 if (!link->network)
96 return false;
97
98 if (link->network->bond)
99 return false;
100
101 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
102 return false;
103
104 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
105 }
106
107 static bool link_dhcp4_server_enabled(Link *link) {
108 assert(link);
109
110 if (link->flags & IFF_LOOPBACK)
111 return false;
112
113 if (!link->network)
114 return false;
115
116 if (link->network->bond)
117 return false;
118
119 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
120 return false;
121
122 return link->network->dhcp_server;
123 }
124
125 bool link_ipv4ll_enabled(Link *link, AddressFamilyBoolean mask) {
126 assert(link);
127 assert((mask & ~(ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) == 0);
128
129 if (link->flags & IFF_LOOPBACK)
130 return false;
131
132 if (!link->network)
133 return false;
134
135 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "ip6gre", "ip6tnl", "sit", "vti", "vti6", "can", "vcan"))
136 return false;
137
138 /* L3 or L3S mode do not support ARP. */
139 if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S))
140 return false;
141
142 if (link->network->bond)
143 return false;
144
145 return link->network->link_local & mask;
146 }
147
148 static bool link_ipv6ll_enabled(Link *link) {
149 assert(link);
150
151 if (!socket_ipv6_is_supported())
152 return false;
153
154 if (link->flags & IFF_LOOPBACK)
155 return false;
156
157 if (!link->network)
158 return false;
159
160 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "sit", "vti", "can", "vcan"))
161 return false;
162
163 if (link->network->bond)
164 return false;
165
166 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
167 return false;
168
169 return link->network->link_local & ADDRESS_FAMILY_IPV6;
170 }
171
172 static bool link_ipv6_enabled(Link *link) {
173 assert(link);
174
175 if (!socket_ipv6_is_supported())
176 return false;
177
178 if (link->network->bond)
179 return false;
180
181 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
182 return false;
183
184 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
185 return false;
186
187 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
188 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
189 }
190
191 static bool link_radv_enabled(Link *link) {
192 assert(link);
193
194 if (!link_ipv6ll_enabled(link))
195 return false;
196
197 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
198 }
199
200 static bool link_ipv4_forward_enabled(Link *link) {
201 assert(link);
202
203 if (link->flags & IFF_LOOPBACK)
204 return false;
205
206 if (!link->network)
207 return false;
208
209 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
210 return false;
211
212 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
213 }
214
215 static bool link_ipv6_forward_enabled(Link *link) {
216 assert(link);
217
218 if (!socket_ipv6_is_supported())
219 return false;
220
221 if (link->flags & IFF_LOOPBACK)
222 return false;
223
224 if (!link->network)
225 return false;
226
227 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
228 return false;
229
230 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
231 return false;
232
233 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
234 }
235
236 static bool link_proxy_arp_enabled(Link *link) {
237 assert(link);
238
239 if (link->flags & IFF_LOOPBACK)
240 return false;
241
242 if (!link->network)
243 return false;
244
245 if (link->network->proxy_arp < 0)
246 return false;
247
248 return true;
249 }
250
251 static bool link_ipv6_accept_ra_enabled(Link *link) {
252 assert(link);
253
254 if (!socket_ipv6_is_supported())
255 return false;
256
257 if (link->flags & IFF_LOOPBACK)
258 return false;
259
260 if (!link->network)
261 return false;
262
263 if (!link_ipv6ll_enabled(link))
264 return false;
265
266 /* If unset use system default (enabled if local forwarding is disabled.
267 * disabled if local forwarding is enabled).
268 * If set, ignore or enforce RA independent of local forwarding state.
269 */
270 if (link->network->ipv6_accept_ra < 0)
271 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
272 return !link_ipv6_forward_enabled(link);
273 else if (link->network->ipv6_accept_ra > 0)
274 /* accept RA even if ip_forward is enabled */
275 return true;
276 else
277 /* ignore RA */
278 return false;
279 }
280
281 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
282 assert(link);
283
284 if (!socket_ipv6_is_supported())
285 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
286
287 if (link->flags & IFF_LOOPBACK)
288 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
289
290 if (!link->network)
291 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
292
293 return link->network->ipv6_privacy_extensions;
294 }
295
296 static int link_enable_ipv6(Link *link) {
297 bool disabled;
298 int r;
299
300 if (link->flags & IFF_LOOPBACK)
301 return 0;
302
303 disabled = !link_ipv6_enabled(link);
304
305 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", disabled);
306 if (r < 0)
307 log_link_warning_errno(link, r, "Cannot %s IPv6: %m", enable_disable(!disabled));
308 else
309 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
310
311 return 0;
312 }
313
314 static bool link_is_enslaved(Link *link) {
315 if (link->flags & IFF_SLAVE)
316 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
317 return true;
318
319 if (!link->network)
320 return false;
321
322 if (link->master_ifindex > 0 && link->network->bridge)
323 return true;
324
325 /* TODO: add conditions for other netdevs. */
326
327 return false;
328 }
329
330 static void link_update_master_operstate(Link *link, NetDev *netdev) {
331 Link *master;
332
333 if (!netdev)
334 return;
335
336 if (link_get(link->manager, netdev->ifindex, &master) < 0)
337 return;
338
339 link_update_operstate(master, true);
340 }
341
342 void link_update_operstate(Link *link, bool also_update_master) {
343 LinkOperationalState operstate;
344 Iterator i;
345
346 assert(link);
347
348 if (link->kernel_operstate == IF_OPER_DORMANT)
349 operstate = LINK_OPERSTATE_DORMANT;
350 else if (link_has_carrier(link)) {
351 Address *address;
352 uint8_t scope = RT_SCOPE_NOWHERE;
353
354 /* if we have carrier, check what addresses we have */
355 SET_FOREACH(address, link->addresses, i) {
356 if (!address_is_ready(address))
357 continue;
358
359 if (address->scope < scope)
360 scope = address->scope;
361 }
362
363 /* for operstate we also take foreign addresses into account */
364 SET_FOREACH(address, link->addresses_foreign, i) {
365 if (!address_is_ready(address))
366 continue;
367
368 if (address->scope < scope)
369 scope = address->scope;
370 }
371
372 if (scope < RT_SCOPE_SITE)
373 /* universally accessible addresses found */
374 operstate = LINK_OPERSTATE_ROUTABLE;
375 else if (scope < RT_SCOPE_HOST)
376 /* only link or site local addresses found */
377 operstate = LINK_OPERSTATE_DEGRADED;
378 else
379 /* no useful addresses found */
380 operstate = LINK_OPERSTATE_CARRIER;
381 } else if (link->flags & IFF_UP)
382 operstate = LINK_OPERSTATE_NO_CARRIER;
383 else
384 operstate = LINK_OPERSTATE_OFF;
385
386 if (IN_SET(operstate, LINK_OPERSTATE_DEGRADED, LINK_OPERSTATE_CARRIER) &&
387 link_is_enslaved(link))
388 operstate = LINK_OPERSTATE_ENSLAVED;
389
390 if (operstate >= LINK_OPERSTATE_CARRIER) {
391 Link *slave;
392
393 SET_FOREACH(slave, link->slaves, i) {
394 link_update_operstate(slave, false);
395
396 if (slave->operstate < LINK_OPERSTATE_CARRIER)
397 operstate = LINK_OPERSTATE_DEGRADED_CARRIER;
398 }
399 }
400
401 if (link->operstate != operstate) {
402 link->operstate = operstate;
403 link_send_changed(link, "OperationalState", NULL);
404 link_dirty(link);
405 }
406
407 if (also_update_master && link->network) {
408 link_update_master_operstate(link, link->network->bond);
409 link_update_master_operstate(link, link->network->bridge);
410 }
411 }
412
413 #define FLAG_STRING(string, flag, old, new) \
414 (((old ^ new) & flag) \
415 ? ((old & flag) ? (" -" string) : (" +" string)) \
416 : "")
417
418 static int link_update_flags(Link *link, sd_netlink_message *m, bool force_update_operstate) {
419 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
420 uint8_t operstate;
421 int r;
422
423 assert(link);
424
425 r = sd_rtnl_message_link_get_flags(m, &flags);
426 if (r < 0)
427 return log_link_warning_errno(link, r, "Could not get link flags: %m");
428
429 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
430 if (r < 0)
431 /* if we got a message without operstate, take it to mean
432 the state was unchanged */
433 operstate = link->kernel_operstate;
434
435 if (!force_update_operstate && (link->flags == flags) && (link->kernel_operstate == operstate))
436 return 0;
437
438 if (link->flags != flags) {
439 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",
440 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
441 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
442 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
443 FLAG_STRING("UP", IFF_UP, link->flags, flags),
444 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
445 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
446 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
447 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
448 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
449 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
450 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
451 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
452 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
453 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
454 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
455 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
456 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
457 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
458 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
459
460 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
461 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
462 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
463 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
464 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
465 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
466 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
467 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
468
469 /* link flags are currently at most 18 bits, let's align to
470 * printing 20 */
471 if (unknown_flags_added)
472 log_link_debug(link,
473 "Unknown link flags gained: %#.5x (ignoring)",
474 unknown_flags_added);
475
476 if (unknown_flags_removed)
477 log_link_debug(link,
478 "Unknown link flags lost: %#.5x (ignoring)",
479 unknown_flags_removed);
480 }
481
482 link->flags = flags;
483 link->kernel_operstate = operstate;
484
485 link_update_operstate(link, true);
486
487 return 0;
488 }
489
490 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
491 _cleanup_(link_unrefp) Link *link = NULL;
492 uint16_t type;
493 const char *ifname, *kind = NULL;
494 int r, ifindex;
495 unsigned short iftype;
496
497 assert(manager);
498 assert(message);
499 assert(ret);
500
501 /* check for link kind */
502 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
503 if (r == 0) {
504 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
505 r = sd_netlink_message_exit_container(message);
506 if (r < 0)
507 return r;
508 }
509
510 r = sd_netlink_message_get_type(message, &type);
511 if (r < 0)
512 return r;
513 else if (type != RTM_NEWLINK)
514 return -EINVAL;
515
516 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
517 if (r < 0)
518 return r;
519 else if (ifindex <= 0)
520 return -EINVAL;
521
522 r = sd_rtnl_message_link_get_type(message, &iftype);
523 if (r < 0)
524 return r;
525
526 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
527 if (r < 0)
528 return r;
529
530 link = new(Link, 1);
531 if (!link)
532 return -ENOMEM;
533
534 *link = (Link) {
535 .n_ref = 1,
536 .manager = manager,
537 .state = LINK_STATE_PENDING,
538 .rtnl_extended_attrs = true,
539 .ifindex = ifindex,
540 .iftype = iftype,
541 };
542
543 link->ifname = strdup(ifname);
544 if (!link->ifname)
545 return -ENOMEM;
546
547 if (kind) {
548 link->kind = strdup(kind);
549 if (!link->kind)
550 return -ENOMEM;
551 }
552
553 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
554 if (r < 0)
555 log_link_debug_errno(link, r, "New device has no master, continuing without");
556
557 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
558 if (r < 0)
559 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
560
561 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
562 return -ENOMEM;
563
564 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
565 return -ENOMEM;
566
567 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
568 return -ENOMEM;
569
570 r = hashmap_ensure_allocated(&manager->links, NULL);
571 if (r < 0)
572 return r;
573
574 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
575 if (r < 0)
576 return r;
577
578 r = link_update_flags(link, message, false);
579 if (r < 0)
580 return r;
581
582 *ret = TAKE_PTR(link);
583
584 return 0;
585 }
586
587 static Link *link_free(Link *link) {
588 Address *address;
589
590 assert(link);
591
592 link->routes = set_free_with_destructor(link->routes, route_free);
593 link->routes_foreign = set_free_with_destructor(link->routes_foreign, route_free);
594
595 link->addresses = set_free_with_destructor(link->addresses, address_free);
596 link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free);
597
598 while ((address = link->pool_addresses)) {
599 LIST_REMOVE(addresses, link->pool_addresses, address);
600 address_free(address);
601 }
602
603 sd_dhcp_server_unref(link->dhcp_server);
604 sd_dhcp_client_unref(link->dhcp_client);
605 sd_dhcp_lease_unref(link->dhcp_lease);
606
607 link_lldp_emit_stop(link);
608
609 free(link->lease_file);
610
611 sd_lldp_unref(link->lldp);
612 free(link->lldp_file);
613
614 ndisc_flush(link);
615
616 sd_ipv4ll_unref(link->ipv4ll);
617 sd_dhcp6_client_unref(link->dhcp6_client);
618 sd_ndisc_unref(link->ndisc);
619 sd_radv_unref(link->radv);
620
621 free(link->ifname);
622 free(link->kind);
623
624 (void) unlink(link->state_file);
625 free(link->state_file);
626
627 sd_device_unref(link->sd_device);
628
629 hashmap_free(link->bound_to_links);
630 hashmap_free(link->bound_by_links);
631
632 set_free_with_destructor(link->slaves, link_unref);
633
634 network_unref(link->network);
635
636 return mfree(link);
637 }
638
639 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
640
641 int link_get(Manager *m, int ifindex, Link **ret) {
642 Link *link;
643
644 assert(m);
645 assert(ifindex);
646 assert(ret);
647
648 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
649 if (!link)
650 return -ENODEV;
651
652 *ret = link;
653
654 return 0;
655 }
656
657 void link_set_state(Link *link, LinkState state) {
658 assert(link);
659
660 if (link->state == state)
661 return;
662
663 log_link_debug(link, "State changed: %s -> %s",
664 link_state_to_string(link->state),
665 link_state_to_string(state));
666
667 link->state = state;
668
669 link_send_changed(link, "AdministrativeState", NULL);
670 }
671
672 static void link_enter_unmanaged(Link *link) {
673 assert(link);
674
675 link_set_state(link, LINK_STATE_UNMANAGED);
676
677 link_dirty(link);
678 }
679
680 int link_stop_clients(Link *link) {
681 int r = 0, k;
682
683 assert(link);
684 assert(link->manager);
685 assert(link->manager->event);
686
687 if (link->dhcp_client) {
688 k = sd_dhcp_client_stop(link->dhcp_client);
689 if (k < 0)
690 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
691 }
692
693 if (link->ipv4ll) {
694 k = sd_ipv4ll_stop(link->ipv4ll);
695 if (k < 0)
696 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
697 }
698
699 if (link->dhcp6_client) {
700 k = sd_dhcp6_client_stop(link->dhcp6_client);
701 if (k < 0)
702 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
703 }
704
705 if (link->ndisc) {
706 k = sd_ndisc_stop(link->ndisc);
707 if (k < 0)
708 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
709 }
710
711 if (link->radv) {
712 k = sd_radv_stop(link->radv);
713 if (k < 0)
714 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
715 }
716
717 link_lldp_emit_stop(link);
718 return r;
719 }
720
721 void link_enter_failed(Link *link) {
722 assert(link);
723
724 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
725 return;
726
727 log_link_warning(link, "Failed");
728
729 link_set_state(link, LINK_STATE_FAILED);
730
731 link_stop_clients(link);
732
733 link_dirty(link);
734 }
735
736 static Address* link_find_dhcp_server_address(Link *link) {
737 Address *address;
738
739 assert(link);
740 assert(link->network);
741
742 /* The first statically configured address if there is any */
743 LIST_FOREACH(addresses, address, link->network->static_addresses) {
744
745 if (address->family != AF_INET)
746 continue;
747
748 if (in_addr_is_null(address->family, &address->in_addr))
749 continue;
750
751 return address;
752 }
753
754 /* If that didn't work, find a suitable address we got from the pool */
755 LIST_FOREACH(addresses, address, link->pool_addresses) {
756 if (address->family != AF_INET)
757 continue;
758
759 return address;
760 }
761
762 return NULL;
763 }
764
765 static int link_join_netdevs_after_configured(Link *link) {
766 NetDev *netdev;
767 Iterator i;
768 int r;
769
770 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
771 if (netdev->ifindex > 0)
772 /* Assume already enslaved. */
773 continue;
774
775 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
776 continue;
777
778 log_struct(LOG_DEBUG,
779 LOG_LINK_INTERFACE(link),
780 LOG_NETDEV_INTERFACE(netdev),
781 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
782
783 r = netdev_join(netdev, link, NULL);
784 if (r < 0)
785 return log_struct_errno(LOG_WARNING, r,
786 LOG_LINK_INTERFACE(link),
787 LOG_NETDEV_INTERFACE(netdev),
788 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
789 }
790
791 return 0;
792 }
793
794 static void link_enter_configured(Link *link) {
795 assert(link);
796 assert(link->network);
797
798 if (link->state != LINK_STATE_CONFIGURING)
799 return;
800
801 log_link_info(link, "Configured");
802
803 link_set_state(link, LINK_STATE_CONFIGURED);
804
805 (void) link_join_netdevs_after_configured(link);
806
807 link_dirty(link);
808 }
809
810 static int link_request_set_routing_policy_rule(Link *link) {
811 RoutingPolicyRule *rule, *rrule = NULL;
812 int r;
813
814 assert(link);
815 assert(link->network);
816
817 link_set_state(link, LINK_STATE_CONFIGURING);
818 link->routing_policy_rules_configured = false;
819
820 LIST_FOREACH(rules, rule, link->network->rules) {
821 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
822 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif,
823 rule->protocol, &rule->sport, &rule->dport, &rrule);
824 if (r == 0) {
825 (void) routing_policy_rule_make_local(link->manager, rrule);
826 continue;
827 }
828
829 r = routing_policy_rule_configure(rule, link, NULL, false);
830 if (r < 0) {
831 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
832 link_enter_failed(link);
833 return r;
834 }
835
836 link->routing_policy_rule_messages++;
837 }
838
839 routing_policy_rule_purge(link->manager, link);
840 if (link->routing_policy_rule_messages == 0) {
841 link->routing_policy_rules_configured = true;
842 link_check_ready(link);
843 } else
844 log_link_debug(link, "Setting routing policy rules");
845
846 return 0;
847 }
848
849 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
850 int r;
851
852 assert(link);
853 assert(link->route_messages > 0);
854 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
855 LINK_STATE_FAILED, LINK_STATE_LINGER));
856
857 link->route_messages--;
858
859 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
860 return 1;
861
862 r = sd_netlink_message_get_errno(m);
863 if (r < 0 && r != -EEXIST)
864 log_link_warning_errno(link, r, "Could not set route: %m");
865
866 if (link->route_messages == 0) {
867 log_link_debug(link, "Routes set");
868 link->static_routes_configured = true;
869 link_check_ready(link);
870 }
871
872 return 1;
873 }
874
875 int link_request_set_routes(Link *link) {
876 enum {
877 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
878 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
879 _PHASE_MAX
880 } phase;
881 Route *rt;
882 int r;
883
884 assert(link);
885 assert(link->network);
886 assert(link->addresses_configured);
887 assert(link->address_messages == 0);
888 assert(link->state != _LINK_STATE_INVALID);
889
890 link_set_state(link, LINK_STATE_CONFIGURING);
891 link->static_routes_configured = false;
892
893 r = link_request_set_routing_policy_rule(link);
894 if (r < 0)
895 return r;
896
897 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
898 for (phase = 0; phase < _PHASE_MAX; phase++)
899 LIST_FOREACH(routes, rt, link->network->static_routes) {
900
901 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
902 continue;
903
904 r = route_configure(rt, link, route_handler);
905 if (r < 0) {
906 log_link_warning_errno(link, r, "Could not set routes: %m");
907 link_enter_failed(link);
908 return r;
909 }
910
911 link->route_messages++;
912 }
913
914 if (link->route_messages == 0) {
915 link->static_routes_configured = true;
916 link_check_ready(link);
917 } else
918 log_link_debug(link, "Setting routes");
919
920 return 0;
921 }
922
923 void link_check_ready(Link *link) {
924 Address *a;
925 Iterator i;
926
927 assert(link);
928
929 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
930 return;
931
932 if (!link->network)
933 return;
934
935 if (!link->addresses_configured)
936 return;
937
938 if (!link->neighbors_configured)
939 return;
940
941 SET_FOREACH(a, link->addresses, i)
942 if (!address_is_ready(a))
943 return;
944
945 if (!link->addresses_ready) {
946 link->addresses_ready = true;
947 link_request_set_routes(link);
948 return;
949 }
950
951 if (!link->static_routes_configured)
952 return;
953
954 if (!link->routing_policy_rules_configured)
955 return;
956
957 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !(link->ipv4ll_address && link->ipv4ll_route))
958 return;
959
960 if (link_ipv6ll_enabled(link) &&
961 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
962 return;
963
964 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
965 !(link->dhcp4_configured || link->dhcp6_configured) &&
966 !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address && link->ipv4ll_route))
967 /* When DHCP is enabled, at least one protocol must provide an address, or
968 * an IPv4ll fallback address must be configured. */
969 return;
970
971 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
972 return;
973
974 if (link->state != LINK_STATE_CONFIGURED)
975 link_enter_configured(link);
976
977 return;
978 }
979
980 static int link_request_set_neighbors(Link *link) {
981 Neighbor *neighbor;
982 int r;
983
984 assert(link);
985 assert(link->network);
986 assert(link->state != _LINK_STATE_INVALID);
987
988 link_set_state(link, LINK_STATE_CONFIGURING);
989 link->neighbors_configured = false;
990
991 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
992 r = neighbor_configure(neighbor, link, NULL);
993 if (r < 0) {
994 log_link_warning_errno(link, r, "Could not set neighbor: %m");
995 link_enter_failed(link);
996 return r;
997 }
998 }
999
1000 if (link->neighbor_messages == 0) {
1001 link->neighbors_configured = true;
1002 link_check_ready(link);
1003 } else
1004 log_link_debug(link, "Setting neighbors");
1005
1006 return 0;
1007 }
1008
1009 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1010 int r;
1011
1012 assert(rtnl);
1013 assert(m);
1014 assert(link);
1015 assert(link->ifname);
1016 assert(link->address_messages > 0);
1017 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1018 LINK_STATE_FAILED, LINK_STATE_LINGER));
1019
1020 link->address_messages--;
1021
1022 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1023 return 1;
1024
1025 r = sd_netlink_message_get_errno(m);
1026 if (r < 0 && r != -EEXIST)
1027 log_link_warning_errno(link, r, "could not set address: %m");
1028 else if (r >= 0)
1029 manager_rtnl_process_address(rtnl, m, link->manager);
1030
1031 if (link->address_messages == 0) {
1032 log_link_debug(link, "Addresses set");
1033 link->addresses_configured = true;
1034 link_check_ready(link);
1035 }
1036
1037 return 1;
1038 }
1039
1040 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1041 _cleanup_free_ struct in_addr *addresses = NULL;
1042 size_t n_addresses = 0, n_allocated = 0;
1043 unsigned i;
1044
1045 log_debug("Copying DNS server information from %s", link->ifname);
1046
1047 if (!link->network)
1048 return 0;
1049
1050 for (i = 0; i < link->network->n_dns; i++) {
1051 struct in_addr ia;
1052
1053 /* Only look for IPv4 addresses */
1054 if (link->network->dns[i].family != AF_INET)
1055 continue;
1056
1057 ia = link->network->dns[i].address.in;
1058
1059 /* Never propagate obviously borked data */
1060 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1061 continue;
1062
1063 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1064 return log_oom();
1065
1066 addresses[n_addresses++] = ia;
1067 }
1068
1069 if (link->network->dhcp_use_dns && link->dhcp_lease) {
1070 const struct in_addr *da = NULL;
1071 int j, n;
1072
1073 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
1074 if (n > 0) {
1075
1076 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1077 return log_oom();
1078
1079 for (j = 0; j < n; j++)
1080 if (in4_addr_is_non_local(&da[j]))
1081 addresses[n_addresses++] = da[j];
1082 }
1083 }
1084
1085 if (n_addresses <= 0)
1086 return 0;
1087
1088 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
1089 }
1090
1091 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1092 _cleanup_free_ struct in_addr *addresses = NULL;
1093 size_t n_addresses = 0, n_allocated = 0;
1094 char **a;
1095
1096 if (!link->network)
1097 return 0;
1098
1099 log_debug("Copying NTP server information from %s", link->ifname);
1100
1101 STRV_FOREACH(a, link->network->ntp) {
1102 union in_addr_union ia;
1103
1104 /* Only look for IPv4 addresses */
1105 if (in_addr_from_string(AF_INET, *a, &ia) <= 0)
1106 continue;
1107
1108 /* Never propagate obviously borked data */
1109 if (in4_addr_is_null(&ia.in) || in4_addr_is_localhost(&ia.in))
1110 continue;
1111
1112 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1113 return log_oom();
1114
1115 addresses[n_addresses++] = ia.in;
1116 }
1117
1118 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1119 const struct in_addr *da = NULL;
1120 int j, n;
1121
1122 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1123 if (n > 0) {
1124
1125 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1126 return log_oom();
1127
1128 for (j = 0; j < n; j++)
1129 if (in4_addr_is_non_local(&da[j]))
1130 addresses[n_addresses++] = da[j];
1131 }
1132 }
1133
1134 if (n_addresses <= 0)
1135 return 0;
1136
1137 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1138 }
1139
1140 static int link_set_bridge_fdb(Link *link) {
1141 FdbEntry *fdb_entry;
1142 int r;
1143
1144 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1145 r = fdb_entry_configure(link, fdb_entry);
1146 if (r < 0)
1147 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1148 }
1149
1150 return 0;
1151 }
1152
1153 static int link_request_set_addresses(Link *link) {
1154 AddressLabel *label;
1155 Address *ad;
1156 int r;
1157
1158 assert(link);
1159 assert(link->network);
1160 assert(link->state != _LINK_STATE_INVALID);
1161
1162 link_set_state(link, LINK_STATE_CONFIGURING);
1163
1164 /* Reset all *_configured flags we are configuring. */
1165 link->addresses_configured = false;
1166 link->addresses_ready = false;
1167 link->neighbors_configured = false;
1168 link->static_routes_configured = false;
1169 link->routing_policy_rules_configured = false;
1170
1171 r = link_set_bridge_fdb(link);
1172 if (r < 0)
1173 return r;
1174
1175 r = link_request_set_neighbors(link);
1176 if (r < 0)
1177 return r;
1178
1179 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1180 bool update;
1181
1182 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1183
1184 r = address_configure(ad, link, address_handler, update);
1185 if (r < 0) {
1186 log_link_warning_errno(link, r, "Could not set addresses: %m");
1187 link_enter_failed(link);
1188 return r;
1189 }
1190
1191 link->address_messages++;
1192 }
1193
1194 LIST_FOREACH(labels, label, link->network->address_labels) {
1195 r = address_label_configure(label, link, NULL, false);
1196 if (r < 0) {
1197 log_link_warning_errno(link, r, "Could not set address label: %m");
1198 link_enter_failed(link);
1199 return r;
1200 }
1201
1202 link->address_label_messages++;
1203 }
1204
1205 /* now that we can figure out a default address for the dhcp server,
1206 start it */
1207 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1208 Address *address;
1209 Link *uplink = NULL;
1210 bool acquired_uplink = false;
1211
1212 address = link_find_dhcp_server_address(link);
1213 if (!address) {
1214 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1215 link_enter_failed(link);
1216 return 0;
1217 }
1218
1219 /* use the server address' subnet as the pool */
1220 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1221 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1222 if (r < 0)
1223 return r;
1224
1225 /* TODO:
1226 r = sd_dhcp_server_set_router(link->dhcp_server,
1227 &main_address->in_addr.in);
1228 if (r < 0)
1229 return r;
1230 */
1231
1232 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1233 r = sd_dhcp_server_set_max_lease_time(
1234 link->dhcp_server,
1235 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1236 if (r < 0)
1237 return r;
1238 }
1239
1240 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1241 r = sd_dhcp_server_set_default_lease_time(
1242 link->dhcp_server,
1243 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1244 if (r < 0)
1245 return r;
1246 }
1247
1248 if (link->network->dhcp_server_emit_dns) {
1249
1250 if (link->network->n_dhcp_server_dns > 0)
1251 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1252 else {
1253 uplink = manager_find_uplink(link->manager, link);
1254 acquired_uplink = true;
1255
1256 if (!uplink) {
1257 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1258 r = 0;
1259 } else
1260 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1261 }
1262 if (r < 0)
1263 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1264 }
1265
1266 if (link->network->dhcp_server_emit_ntp) {
1267
1268 if (link->network->n_dhcp_server_ntp > 0)
1269 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1270 else {
1271 if (!acquired_uplink)
1272 uplink = manager_find_uplink(link->manager, link);
1273
1274 if (!uplink) {
1275 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1276 r = 0;
1277 } else
1278 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1279
1280 }
1281 if (r < 0)
1282 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1283 }
1284
1285 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1286 if (r < 0)
1287 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1288
1289 if (link->network->dhcp_server_emit_timezone) {
1290 _cleanup_free_ char *buffer = NULL;
1291 const char *tz = NULL;
1292
1293 if (link->network->dhcp_server_timezone)
1294 tz = link->network->dhcp_server_timezone;
1295 else {
1296 r = get_timezone(&buffer);
1297 if (r < 0)
1298 log_warning_errno(r, "Failed to determine timezone: %m");
1299 else
1300 tz = buffer;
1301 }
1302
1303 if (tz) {
1304 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1305 if (r < 0)
1306 return r;
1307 }
1308 }
1309 if (!sd_dhcp_server_is_running(link->dhcp_server)) {
1310 r = sd_dhcp_server_start(link->dhcp_server);
1311 if (r < 0) {
1312 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1313
1314 link_enter_failed(link);
1315
1316 return 0;
1317 }
1318 }
1319
1320 log_link_debug(link, "Offering DHCPv4 leases");
1321 }
1322
1323 if (link->address_messages == 0) {
1324 link->addresses_configured = true;
1325 link_check_ready(link);
1326 } else
1327 log_link_debug(link, "Setting addresses");
1328
1329 return 0;
1330 }
1331
1332 static int link_set_bridge_vlan(Link *link) {
1333 int r;
1334
1335 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1336 if (r < 0)
1337 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1338
1339 return r;
1340 }
1341
1342 static int link_set_proxy_arp(Link *link) {
1343 int r;
1344
1345 if (!link_proxy_arp_enabled(link))
1346 return 0;
1347
1348 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1349 if (r < 0)
1350 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1351
1352 return 0;
1353 }
1354
1355 static int link_configure_after_setting_mtu(Link *link);
1356
1357 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1358 int r;
1359
1360 assert(m);
1361 assert(link);
1362 assert(link->ifname);
1363
1364 link->setting_mtu = false;
1365
1366 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1367 return 1;
1368
1369 r = sd_netlink_message_get_errno(m);
1370 if (r < 0) {
1371 log_link_warning_errno(link, r, "Could not set MTU: %m");
1372 return 1;
1373 }
1374
1375 log_link_debug(link, "Setting MTU done.");
1376
1377 if (link->state == LINK_STATE_INITIALIZED)
1378 (void) link_configure_after_setting_mtu(link);
1379
1380 return 1;
1381 }
1382
1383 int link_set_mtu(Link *link, uint32_t mtu) {
1384 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1385 int r;
1386
1387 assert(link);
1388 assert(link->manager);
1389 assert(link->manager->rtnl);
1390
1391 if (mtu == 0 || link->setting_mtu)
1392 return 0;
1393
1394 if (link->mtu == mtu)
1395 return 0;
1396
1397 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1398
1399 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1400 if (r < 0)
1401 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1402
1403 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1404 * for this interface, then disable IPv6 else enable it. */
1405 (void) link_enable_ipv6(link);
1406
1407 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1408 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1409 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1410
1411 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1412 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1413
1414 mtu = IPV6_MIN_MTU;
1415 }
1416
1417 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1418 if (r < 0)
1419 return log_link_error_errno(link, r, "Could not append MTU: %m");
1420
1421 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1422 link_netlink_destroy_callback, link);
1423 if (r < 0)
1424 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1425
1426 link_ref(link);
1427 link->setting_mtu = true;
1428
1429 return 0;
1430 }
1431
1432 static bool link_reduces_vlan_mtu(Link *link) {
1433 /* See netif_reduces_vlan_mtu() in kernel. */
1434 return streq_ptr(link->kind, "macsec");
1435 }
1436
1437 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1438 uint32_t mtu = 0;
1439 NetDev *dev;
1440 Iterator i;
1441
1442 HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1443 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1444 /* See vlan_dev_change_mtu() in kernel. */
1445 mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1446
1447 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1448 /* See macvlan_change_mtu() in kernel. */
1449 mtu = dev->mtu;
1450
1451 return mtu;
1452 }
1453
1454 static int link_configure_mtu(Link *link) {
1455 uint32_t mtu;
1456
1457 assert(link);
1458 assert(link->network);
1459
1460 if (link->network->mtu > 0)
1461 return link_set_mtu(link, link->network->mtu);
1462
1463 mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1464 if (link->mtu >= mtu)
1465 return 0;
1466
1467 log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1468 "If it is not desired, then please explicitly specify MTUBytes= setting.",
1469 link->mtu, mtu);
1470
1471 return link_set_mtu(link, mtu);
1472 }
1473
1474 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1475 int r;
1476
1477 assert(m);
1478 assert(link);
1479 assert(link->ifname);
1480
1481 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1482 return 1;
1483
1484 r = sd_netlink_message_get_errno(m);
1485 if (r < 0)
1486 log_link_warning_errno(link, r, "Could not set link flags: %m");
1487
1488 return 1;
1489 }
1490
1491 static int link_set_flags(Link *link) {
1492 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1493 unsigned ifi_change = 0;
1494 unsigned ifi_flags = 0;
1495 int r;
1496
1497 assert(link);
1498 assert(link->manager);
1499 assert(link->manager->rtnl);
1500
1501 if (link->flags & IFF_LOOPBACK)
1502 return 0;
1503
1504 if (!link->network)
1505 return 0;
1506
1507 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1508 return 0;
1509
1510 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1511 if (r < 0)
1512 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1513
1514 if (link->network->arp >= 0) {
1515 ifi_change |= IFF_NOARP;
1516 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1517 }
1518
1519 if (link->network->multicast >= 0) {
1520 ifi_change |= IFF_MULTICAST;
1521 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1522 }
1523
1524 if (link->network->allmulticast >= 0) {
1525 ifi_change |= IFF_ALLMULTI;
1526 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1527 }
1528
1529 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1530 if (r < 0)
1531 return log_link_error_errno(link, r, "Could not set link flags: %m");
1532
1533 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1534 link_netlink_destroy_callback, link);
1535 if (r < 0)
1536 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1537
1538 link_ref(link);
1539
1540 return 0;
1541 }
1542
1543 static int link_acquire_ipv6_conf(Link *link) {
1544 int r;
1545
1546 assert(link);
1547
1548 if (link_ipv6_accept_ra_enabled(link)) {
1549 assert(link->ndisc);
1550
1551 log_link_debug(link, "Discovering IPv6 routers");
1552
1553 r = sd_ndisc_start(link->ndisc);
1554 if (r < 0 && r != -EBUSY)
1555 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1556 }
1557
1558 if (link_radv_enabled(link)) {
1559 assert(link->radv);
1560 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1561
1562 log_link_debug(link, "Starting IPv6 Router Advertisements");
1563
1564 r = sd_radv_start(link->radv);
1565 if (r < 0 && r != -EBUSY)
1566 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1567 }
1568
1569 (void) dhcp6_request_prefix_delegation(link);
1570
1571 return 0;
1572 }
1573
1574 static int link_acquire_ipv4_conf(Link *link) {
1575 int r;
1576
1577 assert(link);
1578 assert(link->manager);
1579 assert(link->manager->event);
1580
1581 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1582 assert(link->ipv4ll);
1583
1584 log_link_debug(link, "Acquiring IPv4 link-local address");
1585
1586 r = sd_ipv4ll_start(link->ipv4ll);
1587 if (r < 0)
1588 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1589 }
1590
1591 if (link_dhcp4_enabled(link)) {
1592 assert(link->dhcp_client);
1593
1594 log_link_debug(link, "Acquiring DHCPv4 lease");
1595
1596 r = sd_dhcp_client_start(link->dhcp_client);
1597 if (r < 0)
1598 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1599 }
1600
1601 return 0;
1602 }
1603
1604 static int link_acquire_conf(Link *link) {
1605 int r;
1606
1607 assert(link);
1608
1609 r = link_acquire_ipv4_conf(link);
1610 if (r < 0)
1611 return r;
1612
1613 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1614 r = link_acquire_ipv6_conf(link);
1615 if (r < 0)
1616 return r;
1617 }
1618
1619 if (link_lldp_emit_enabled(link)) {
1620 r = link_lldp_emit_start(link);
1621 if (r < 0)
1622 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1623 }
1624
1625 return 0;
1626 }
1627
1628 bool link_has_carrier(Link *link) {
1629 /* see Documentation/networking/operstates.txt in the kernel sources */
1630
1631 if (link->kernel_operstate == IF_OPER_UP)
1632 return true;
1633
1634 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1635 /* operstate may not be implemented, so fall back to flags */
1636 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1637 !FLAGS_SET(link->flags, IFF_DORMANT))
1638 return true;
1639
1640 return false;
1641 }
1642
1643 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1644 int r;
1645
1646 assert(link);
1647
1648 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1649 return 1;
1650
1651 r = sd_netlink_message_get_errno(m);
1652 if (r < 0)
1653 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1654
1655 return 1;
1656 }
1657
1658 static int link_configure_addrgen_mode(Link *link) {
1659 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1660 uint8_t ipv6ll_mode;
1661 int r;
1662
1663 assert(link);
1664 assert(link->network);
1665 assert(link->manager);
1666 assert(link->manager->rtnl);
1667
1668 if (!socket_ipv6_is_supported())
1669 return 0;
1670
1671 log_link_debug(link, "Setting address genmode for link");
1672
1673 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1674 if (r < 0)
1675 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1676
1677 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1678 if (r < 0)
1679 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1680
1681 r = sd_netlink_message_open_container(req, AF_INET6);
1682 if (r < 0)
1683 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1684
1685 if (!link_ipv6ll_enabled(link))
1686 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1687 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1688 /* The file may not exist. And event if it exists, when stable_secret is unset,
1689 * reading the file fails with EIO. */
1690 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1691 else
1692 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1693
1694 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1695 if (r < 0)
1696 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1697
1698 r = sd_netlink_message_close_container(req);
1699 if (r < 0)
1700 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1701
1702 r = sd_netlink_message_close_container(req);
1703 if (r < 0)
1704 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1705
1706 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1707 link_netlink_destroy_callback, link);
1708 if (r < 0)
1709 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1710
1711 link_ref(link);
1712
1713 return 0;
1714 }
1715
1716 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1717 int r;
1718
1719 assert(link);
1720
1721 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1722 return 1;
1723
1724 r = sd_netlink_message_get_errno(m);
1725 if (r < 0)
1726 /* we warn but don't fail the link, as it may be brought up later */
1727 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1728
1729 return 1;
1730 }
1731
1732 static int link_up(Link *link) {
1733 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1734 int r;
1735
1736 assert(link);
1737 assert(link->network);
1738 assert(link->manager);
1739 assert(link->manager->rtnl);
1740
1741 log_link_debug(link, "Bringing link up");
1742
1743 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1744 if (r < 0)
1745 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1746
1747 /* set it free if not enslaved with networkd */
1748 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1749 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1750 if (r < 0)
1751 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1752 }
1753
1754 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1755 if (r < 0)
1756 return log_link_error_errno(link, r, "Could not set link flags: %m");
1757
1758 if (link->network->mac) {
1759 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1760 if (r < 0)
1761 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1762 }
1763
1764 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1765 link_netlink_destroy_callback, link);
1766 if (r < 0)
1767 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1768
1769 link_ref(link);
1770
1771 return 0;
1772 }
1773
1774 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1775 int r;
1776
1777 assert(link);
1778
1779 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1780 return 1;
1781
1782 r = sd_netlink_message_get_errno(m);
1783 if (r < 0)
1784 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1785
1786 return 1;
1787 }
1788
1789 int link_down(Link *link, link_netlink_message_handler_t callback) {
1790 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1791 int r;
1792
1793 assert(link);
1794 assert(link->manager);
1795 assert(link->manager->rtnl);
1796
1797 log_link_debug(link, "Bringing link down");
1798
1799 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1800 RTM_SETLINK, link->ifindex);
1801 if (r < 0)
1802 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1803
1804 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1805 if (r < 0)
1806 return log_link_error_errno(link, r, "Could not set link flags: %m");
1807
1808 r = netlink_call_async(link->manager->rtnl, NULL, req,
1809 callback ?: link_down_handler,
1810 link_netlink_destroy_callback, link);
1811 if (r < 0)
1812 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1813
1814 link_ref(link);
1815
1816 return 0;
1817 }
1818
1819 static int link_handle_bound_to_list(Link *link) {
1820 Link *l;
1821 Iterator i;
1822 int r;
1823 bool required_up = false;
1824 bool link_is_up = false;
1825
1826 assert(link);
1827
1828 if (hashmap_isempty(link->bound_to_links))
1829 return 0;
1830
1831 if (link->flags & IFF_UP)
1832 link_is_up = true;
1833
1834 HASHMAP_FOREACH (l, link->bound_to_links, i)
1835 if (link_has_carrier(l)) {
1836 required_up = true;
1837 break;
1838 }
1839
1840 if (!required_up && link_is_up) {
1841 r = link_down(link, NULL);
1842 if (r < 0)
1843 return r;
1844 } else if (required_up && !link_is_up) {
1845 r = link_up(link);
1846 if (r < 0)
1847 return r;
1848 }
1849
1850 return 0;
1851 }
1852
1853 static int link_handle_bound_by_list(Link *link) {
1854 Iterator i;
1855 Link *l;
1856 int r;
1857
1858 assert(link);
1859
1860 if (hashmap_isempty(link->bound_by_links))
1861 return 0;
1862
1863 HASHMAP_FOREACH (l, link->bound_by_links, i) {
1864 r = link_handle_bound_to_list(l);
1865 if (r < 0)
1866 return r;
1867 }
1868
1869 return 0;
1870 }
1871
1872 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1873 int r;
1874
1875 assert(link);
1876 assert(carrier);
1877
1878 if (link == carrier)
1879 return 0;
1880
1881 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1882 return 0;
1883
1884 r = hashmap_ensure_allocated(h, NULL);
1885 if (r < 0)
1886 return r;
1887
1888 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1889 if (r < 0)
1890 return r;
1891
1892 return 0;
1893 }
1894
1895 static int link_new_bound_by_list(Link *link) {
1896 Manager *m;
1897 Link *carrier;
1898 Iterator i;
1899 int r;
1900 bool list_updated = false;
1901
1902 assert(link);
1903 assert(link->manager);
1904
1905 m = link->manager;
1906
1907 HASHMAP_FOREACH(carrier, m->links, i) {
1908 if (!carrier->network)
1909 continue;
1910
1911 if (strv_isempty(carrier->network->bind_carrier))
1912 continue;
1913
1914 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
1915 r = link_put_carrier(link, carrier, &link->bound_by_links);
1916 if (r < 0)
1917 return r;
1918
1919 list_updated = true;
1920 }
1921 }
1922
1923 if (list_updated)
1924 link_dirty(link);
1925
1926 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
1927 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1928 if (r < 0)
1929 return r;
1930
1931 link_dirty(carrier);
1932 }
1933
1934 return 0;
1935 }
1936
1937 static int link_new_bound_to_list(Link *link) {
1938 Manager *m;
1939 Link *carrier;
1940 Iterator i;
1941 int r;
1942 bool list_updated = false;
1943
1944 assert(link);
1945 assert(link->manager);
1946
1947 if (!link->network)
1948 return 0;
1949
1950 if (strv_isempty(link->network->bind_carrier))
1951 return 0;
1952
1953 m = link->manager;
1954
1955 HASHMAP_FOREACH (carrier, m->links, i) {
1956 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
1957 r = link_put_carrier(link, carrier, &link->bound_to_links);
1958 if (r < 0)
1959 return r;
1960
1961 list_updated = true;
1962 }
1963 }
1964
1965 if (list_updated)
1966 link_dirty(link);
1967
1968 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
1969 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
1970 if (r < 0)
1971 return r;
1972
1973 link_dirty(carrier);
1974 }
1975
1976 return 0;
1977 }
1978
1979 static int link_new_carrier_maps(Link *link) {
1980 int r;
1981
1982 r = link_new_bound_by_list(link);
1983 if (r < 0)
1984 return r;
1985
1986 r = link_handle_bound_by_list(link);
1987 if (r < 0)
1988 return r;
1989
1990 r = link_new_bound_to_list(link);
1991 if (r < 0)
1992 return r;
1993
1994 r = link_handle_bound_to_list(link);
1995 if (r < 0)
1996 return r;
1997
1998 return 0;
1999 }
2000
2001 static void link_free_bound_to_list(Link *link) {
2002 Link *bound_to;
2003 Iterator i;
2004
2005 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2006 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2007
2008 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2009 link_dirty(bound_to);
2010 }
2011
2012 return;
2013 }
2014
2015 static void link_free_bound_by_list(Link *link) {
2016 Link *bound_by;
2017 Iterator i;
2018
2019 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2020 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2021
2022 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2023 link_dirty(bound_by);
2024 link_handle_bound_to_list(bound_by);
2025 }
2026 }
2027
2028 return;
2029 }
2030
2031 static void link_free_carrier_maps(Link *link) {
2032 bool list_updated = false;
2033
2034 assert(link);
2035
2036 if (!hashmap_isempty(link->bound_to_links)) {
2037 link_free_bound_to_list(link);
2038 list_updated = true;
2039 }
2040
2041 if (!hashmap_isempty(link->bound_by_links)) {
2042 link_free_bound_by_list(link);
2043 list_updated = true;
2044 }
2045
2046 if (list_updated)
2047 link_dirty(link);
2048
2049 return;
2050 }
2051
2052 static int link_append_to_master(Link *link, NetDev *netdev) {
2053 Link *master;
2054 int r;
2055
2056 assert(link);
2057 assert(netdev);
2058
2059 r = link_get(link->manager, netdev->ifindex, &master);
2060 if (r < 0)
2061 return r;
2062
2063 r = set_ensure_allocated(&master->slaves, NULL);
2064 if (r < 0)
2065 return r;
2066
2067 r = set_put(master->slaves, link);
2068 if (r < 0)
2069 return r;
2070
2071 link_ref(link);
2072 return 0;
2073 }
2074
2075 static void link_drop_from_master(Link *link, NetDev *netdev) {
2076 Link *master;
2077
2078 assert(link);
2079
2080 if (!link->manager || !netdev)
2081 return;
2082
2083 if (link_get(link->manager, netdev->ifindex, &master) < 0)
2084 return;
2085
2086 link_unref(set_remove(master->slaves, link));
2087 }
2088
2089 static void link_detach_from_manager(Link *link) {
2090 if (!link || !link->manager)
2091 return;
2092
2093 link_unref(set_remove(link->manager->links_requesting_uuid, link));
2094 link_clean(link);
2095
2096 /* The following must be called at last. */
2097 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2098 link_unref(link);
2099 }
2100
2101 void link_drop(Link *link) {
2102 if (!link || link->state == LINK_STATE_LINGER)
2103 return;
2104
2105 link_set_state(link, LINK_STATE_LINGER);
2106
2107 link_free_carrier_maps(link);
2108
2109 if (link->network) {
2110 link_drop_from_master(link, link->network->bridge);
2111 link_drop_from_master(link, link->network->bond);
2112 }
2113
2114 log_link_debug(link, "Link removed");
2115
2116 (void) unlink(link->state_file);
2117 link_detach_from_manager(link);
2118 }
2119
2120 static int link_joined(Link *link) {
2121 int r;
2122
2123 assert(link);
2124 assert(link->network);
2125
2126 if (!hashmap_isempty(link->bound_to_links)) {
2127 r = link_handle_bound_to_list(link);
2128 if (r < 0)
2129 return r;
2130 } else if (!(link->flags & IFF_UP)) {
2131 r = link_up(link);
2132 if (r < 0) {
2133 link_enter_failed(link);
2134 return r;
2135 }
2136 }
2137
2138 if (link->network->bridge) {
2139 r = link_set_bridge(link);
2140 if (r < 0)
2141 log_link_error_errno(link, r, "Could not set bridge message: %m");
2142
2143 r = link_append_to_master(link, link->network->bridge);
2144 if (r < 0)
2145 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2146 }
2147
2148 if (link->network->bond) {
2149 r = link_set_bond(link);
2150 if (r < 0)
2151 log_link_error_errno(link, r, "Could not set bond message: %m");
2152
2153 r = link_append_to_master(link, link->network->bond);
2154 if (r < 0)
2155 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2156 }
2157
2158 if (link->network->use_br_vlan &&
2159 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2160 r = link_set_bridge_vlan(link);
2161 if (r < 0)
2162 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2163 }
2164
2165 /* Skip setting up addresses until it gets carrier,
2166 or it would try to set addresses twice,
2167 which is bad for non-idempotent steps. */
2168 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2169 return 0;
2170
2171 return link_request_set_addresses(link);
2172 }
2173
2174 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2175 int r;
2176
2177 assert(link);
2178 assert(link->network);
2179 assert(link->enslaving > 0);
2180
2181 link->enslaving--;
2182
2183 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2184 return 1;
2185
2186 r = sd_netlink_message_get_errno(m);
2187 if (r < 0 && r != -EEXIST) {
2188 log_link_error_errno(link, r, "Could not join netdev: %m");
2189 link_enter_failed(link);
2190 return 1;
2191 } else
2192 log_link_debug(link, "Joined netdev");
2193
2194 if (link->enslaving == 0) {
2195 link_joined(link);
2196 }
2197
2198 return 1;
2199 }
2200
2201 static int link_enter_join_netdev(Link *link) {
2202 NetDev *netdev;
2203 Iterator i;
2204 int r;
2205
2206 assert(link);
2207 assert(link->network);
2208 assert(link->state == LINK_STATE_INITIALIZED);
2209
2210 link_set_state(link, LINK_STATE_CONFIGURING);
2211
2212 link_dirty(link);
2213 link->enslaving = 0;
2214
2215 if (link->network->bond) {
2216 if (link->network->bond->state == NETDEV_STATE_READY &&
2217 link->network->bond->ifindex == link->master_ifindex)
2218 return link_joined(link);
2219
2220 log_struct(LOG_DEBUG,
2221 LOG_LINK_INTERFACE(link),
2222 LOG_NETDEV_INTERFACE(link->network->bond),
2223 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2224
2225 link->enslaving++;
2226
2227 r = netdev_join(link->network->bond, link, netdev_join_handler);
2228 if (r < 0) {
2229 log_struct_errno(LOG_WARNING, r,
2230 LOG_LINK_INTERFACE(link),
2231 LOG_NETDEV_INTERFACE(link->network->bond),
2232 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2233 link_enter_failed(link);
2234 return r;
2235 }
2236 }
2237
2238 if (link->network->bridge) {
2239 log_struct(LOG_DEBUG,
2240 LOG_LINK_INTERFACE(link),
2241 LOG_NETDEV_INTERFACE(link->network->bridge),
2242 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2243
2244 link->enslaving++;
2245
2246 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2247 if (r < 0) {
2248 log_struct_errno(LOG_WARNING, r,
2249 LOG_LINK_INTERFACE(link),
2250 LOG_NETDEV_INTERFACE(link->network->bridge),
2251 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2252 link_enter_failed(link);
2253 return r;
2254 }
2255 }
2256
2257 if (link->network->vrf) {
2258 log_struct(LOG_DEBUG,
2259 LOG_LINK_INTERFACE(link),
2260 LOG_NETDEV_INTERFACE(link->network->vrf),
2261 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2262
2263 link->enslaving++;
2264
2265 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2266 if (r < 0) {
2267 log_struct_errno(LOG_WARNING, r,
2268 LOG_LINK_INTERFACE(link),
2269 LOG_NETDEV_INTERFACE(link->network->vrf),
2270 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2271 link_enter_failed(link);
2272 return r;
2273 }
2274 }
2275
2276 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2277
2278 if (netdev->ifindex > 0)
2279 /* Assume already enslaved. */
2280 continue;
2281
2282 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2283 continue;
2284
2285 log_struct(LOG_DEBUG,
2286 LOG_LINK_INTERFACE(link),
2287 LOG_NETDEV_INTERFACE(netdev),
2288 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2289
2290 link->enslaving++;
2291
2292 r = netdev_join(netdev, link, netdev_join_handler);
2293 if (r < 0) {
2294 log_struct_errno(LOG_WARNING, r,
2295 LOG_LINK_INTERFACE(link),
2296 LOG_NETDEV_INTERFACE(netdev),
2297 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2298 link_enter_failed(link);
2299 return r;
2300 }
2301 }
2302
2303 if (link->enslaving == 0)
2304 return link_joined(link);
2305
2306 return 0;
2307 }
2308
2309 static int link_set_ipv4_forward(Link *link) {
2310 int r;
2311
2312 if (!link_ipv4_forward_enabled(link))
2313 return 0;
2314
2315 /* We propagate the forwarding flag from one interface to the
2316 * global setting one way. This means: as long as at least one
2317 * interface was configured at any time that had IP forwarding
2318 * enabled the setting will stay on for good. We do this
2319 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2320 * somewhat in sync (see below). */
2321
2322 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2323 if (r < 0)
2324 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2325
2326 return 0;
2327 }
2328
2329 static int link_set_ipv6_forward(Link *link) {
2330 int r;
2331
2332 if (!link_ipv6_forward_enabled(link))
2333 return 0;
2334
2335 /* On Linux, the IPv6 stack does not know a per-interface
2336 * packet forwarding setting: either packet forwarding is on
2337 * for all, or off for all. We hence don't bother with a
2338 * per-interface setting, but simply propagate the interface
2339 * flag, if it is set, to the global flag, one-way. Note that
2340 * while IPv4 would allow a per-interface flag, we expose the
2341 * same behaviour there and also propagate the setting from
2342 * one to all, to keep things simple (see above). */
2343
2344 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2345 if (r < 0)
2346 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2347
2348 return 0;
2349 }
2350
2351 static int link_set_ipv6_privacy_extensions(Link *link) {
2352 IPv6PrivacyExtensions s;
2353 int r;
2354
2355 s = link_ipv6_privacy_extensions(link);
2356 if (s < 0)
2357 return 0;
2358
2359 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2360 if (r < 0)
2361 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2362
2363 return 0;
2364 }
2365
2366 static int link_set_ipv6_accept_ra(Link *link) {
2367 int r;
2368
2369 /* Make this a NOP if IPv6 is not available */
2370 if (!socket_ipv6_is_supported())
2371 return 0;
2372
2373 if (link->flags & IFF_LOOPBACK)
2374 return 0;
2375
2376 if (!link->network)
2377 return 0;
2378
2379 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2380 if (r < 0)
2381 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2382
2383 return 0;
2384 }
2385
2386 static int link_set_ipv6_dad_transmits(Link *link) {
2387 int r;
2388
2389 /* Make this a NOP if IPv6 is not available */
2390 if (!socket_ipv6_is_supported())
2391 return 0;
2392
2393 if (link->flags & IFF_LOOPBACK)
2394 return 0;
2395
2396 if (!link->network)
2397 return 0;
2398
2399 if (link->network->ipv6_dad_transmits < 0)
2400 return 0;
2401
2402 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2403 if (r < 0)
2404 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2405
2406 return 0;
2407 }
2408
2409 static int link_set_ipv6_hop_limit(Link *link) {
2410 int r;
2411
2412 /* Make this a NOP if IPv6 is not available */
2413 if (!socket_ipv6_is_supported())
2414 return 0;
2415
2416 if (link->flags & IFF_LOOPBACK)
2417 return 0;
2418
2419 if (!link->network)
2420 return 0;
2421
2422 if (link->network->ipv6_hop_limit < 0)
2423 return 0;
2424
2425 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2426 if (r < 0)
2427 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2428
2429 return 0;
2430 }
2431
2432 static int link_set_ipv6_mtu(Link *link) {
2433 int r;
2434
2435 /* Make this a NOP if IPv6 is not available */
2436 if (!socket_ipv6_is_supported())
2437 return 0;
2438
2439 if (link->flags & IFF_LOOPBACK)
2440 return 0;
2441
2442 if (link->network->ipv6_mtu == 0)
2443 return 0;
2444
2445 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2446 if (r < 0)
2447 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2448
2449 return 0;
2450 }
2451
2452 static bool link_is_static_address_configured(Link *link, Address *address) {
2453 Address *net_address;
2454
2455 assert(link);
2456 assert(address);
2457
2458 if (!link->network)
2459 return false;
2460
2461 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2462 if (address_equal(net_address, address))
2463 return true;
2464
2465 return false;
2466 }
2467
2468 static bool link_is_static_route_configured(Link *link, Route *route) {
2469 Route *net_route;
2470
2471 assert(link);
2472 assert(route);
2473
2474 if (!link->network)
2475 return false;
2476
2477 LIST_FOREACH(routes, net_route, link->network->static_routes)
2478 if (route_equal(net_route, route))
2479 return true;
2480
2481 return false;
2482 }
2483
2484 static int link_drop_foreign_config(Link *link) {
2485 Address *address;
2486 Route *route;
2487 Iterator i;
2488 int r;
2489
2490 SET_FOREACH(address, link->addresses_foreign, i) {
2491 /* we consider IPv6LL addresses to be managed by the kernel */
2492 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2493 continue;
2494
2495 if (link_is_static_address_configured(link, address)) {
2496 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2497 if (r < 0)
2498 return log_link_error_errno(link, r, "Failed to add address: %m");
2499 } else {
2500 r = address_remove(address, link, NULL);
2501 if (r < 0)
2502 return r;
2503 }
2504 }
2505
2506 SET_FOREACH(route, link->routes_foreign, i) {
2507 /* do not touch routes managed by the kernel */
2508 if (route->protocol == RTPROT_KERNEL)
2509 continue;
2510
2511 if (link_is_static_route_configured(link, route)) {
2512 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2513 if (r < 0)
2514 return r;
2515 } else {
2516 r = route_remove(route, link, NULL);
2517 if (r < 0)
2518 return r;
2519 }
2520 }
2521
2522 return 0;
2523 }
2524
2525 static int link_drop_config(Link *link) {
2526 Address *address, *pool_address;
2527 Route *route;
2528 Iterator i;
2529 int r;
2530
2531 SET_FOREACH(address, link->addresses, i) {
2532 /* we consider IPv6LL addresses to be managed by the kernel */
2533 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2534 continue;
2535
2536 r = address_remove(address, link, NULL);
2537 if (r < 0)
2538 return r;
2539
2540 /* If this address came from an address pool, clean up the pool */
2541 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2542 if (address_equal(address, pool_address)) {
2543 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2544 address_free(pool_address);
2545 break;
2546 }
2547 }
2548 }
2549
2550 SET_FOREACH(route, link->routes, i) {
2551 /* do not touch routes managed by the kernel */
2552 if (route->protocol == RTPROT_KERNEL)
2553 continue;
2554
2555 r = route_remove(route, link, NULL);
2556 if (r < 0)
2557 return r;
2558 }
2559
2560 ndisc_flush(link);
2561
2562 return 0;
2563 }
2564
2565 static int link_configure(Link *link) {
2566 int r;
2567
2568 assert(link);
2569 assert(link->network);
2570 assert(link->state == LINK_STATE_INITIALIZED);
2571
2572 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
2573 return link_configure_can(link);
2574
2575 /* Drop foreign config, but ignore loopback or critical devices.
2576 * We do not want to remove loopback address or addresses used for root NFS. */
2577 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2578 r = link_drop_foreign_config(link);
2579 if (r < 0)
2580 return r;
2581 }
2582
2583 r = link_set_proxy_arp(link);
2584 if (r < 0)
2585 return r;
2586
2587 r = ipv6_proxy_ndp_addresses_configure(link);
2588 if (r < 0)
2589 return r;
2590
2591 r = link_set_ipv4_forward(link);
2592 if (r < 0)
2593 return r;
2594
2595 r = link_set_ipv6_forward(link);
2596 if (r < 0)
2597 return r;
2598
2599 r = link_set_ipv6_privacy_extensions(link);
2600 if (r < 0)
2601 return r;
2602
2603 r = link_set_ipv6_accept_ra(link);
2604 if (r < 0)
2605 return r;
2606
2607 r = link_set_ipv6_dad_transmits(link);
2608 if (r < 0)
2609 return r;
2610
2611 r = link_set_ipv6_hop_limit(link);
2612 if (r < 0)
2613 return r;
2614
2615 r = link_set_flags(link);
2616 if (r < 0)
2617 return r;
2618
2619 r = link_set_ipv6_mtu(link);
2620 if (r < 0)
2621 return r;
2622
2623 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
2624 r = ipv4ll_configure(link);
2625 if (r < 0)
2626 return r;
2627 }
2628
2629 if (link_dhcp4_enabled(link)) {
2630 r = dhcp4_set_promote_secondaries(link);
2631 if (r < 0)
2632 return r;
2633
2634 r = dhcp4_configure(link);
2635 if (r < 0)
2636 return r;
2637 }
2638
2639 if (link_dhcp4_server_enabled(link)) {
2640 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2641 if (r < 0)
2642 return r;
2643
2644 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2645 if (r < 0)
2646 return r;
2647 }
2648
2649 if (link_dhcp6_enabled(link) ||
2650 link_ipv6_accept_ra_enabled(link)) {
2651 r = dhcp6_configure(link);
2652 if (r < 0)
2653 return r;
2654 }
2655
2656 if (link_ipv6_accept_ra_enabled(link)) {
2657 r = ndisc_configure(link);
2658 if (r < 0)
2659 return r;
2660 }
2661
2662 if (link_radv_enabled(link)) {
2663 r = radv_configure(link);
2664 if (r < 0)
2665 return r;
2666 }
2667
2668 if (link_lldp_rx_enabled(link)) {
2669 r = link_lldp_rx_configure(link);
2670 if (r < 0)
2671 return r;
2672 }
2673
2674 r = link_configure_mtu(link);
2675 if (r < 0)
2676 return r;
2677
2678 r = link_configure_addrgen_mode(link);
2679 if (r < 0)
2680 return r;
2681
2682 return link_configure_after_setting_mtu(link);
2683 }
2684
2685 static int link_configure_after_setting_mtu(Link *link) {
2686 int r;
2687
2688 assert(link);
2689 assert(link->network);
2690 assert(link->state == LINK_STATE_INITIALIZED);
2691
2692 if (link->setting_mtu)
2693 return 0;
2694
2695 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2696 r = link_acquire_conf(link);
2697 if (r < 0)
2698 return r;
2699 }
2700
2701 return link_enter_join_netdev(link);
2702 }
2703
2704 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
2705 assert(duid);
2706
2707 if (duid->raw_data_len > 0)
2708 return 0;
2709
2710 if (duid->type != DUID_TYPE_UUID)
2711 return -EINVAL;
2712
2713 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
2714 duid->raw_data_len = sizeof(sd_id128_t);
2715
2716 return 1;
2717 }
2718
2719 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
2720 Manager *manager = userdata;
2721 const sd_bus_error *e;
2722 const void *a;
2723 size_t sz;
2724 DUID *duid;
2725 Link *link;
2726 int r;
2727
2728 assert(m);
2729 assert(manager);
2730
2731 e = sd_bus_message_get_error(m);
2732 if (e) {
2733 log_error_errno(sd_bus_error_get_errno(e),
2734 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
2735 e->message);
2736 goto configure;
2737 }
2738
2739 r = sd_bus_message_read_array(m, 'y', &a, &sz);
2740 if (r < 0)
2741 goto configure;
2742
2743 if (sz != sizeof(sd_id128_t)) {
2744 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
2745 goto configure;
2746 }
2747
2748 memcpy(&manager->product_uuid, a, sz);
2749 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
2750 (void) duid_set_uuid(duid, manager->product_uuid);
2751
2752 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
2753
2754 configure:
2755 while ((link = set_steal_first(manager->links_requesting_uuid))) {
2756 r = link_configure(link);
2757 if (r < 0)
2758 log_link_error_errno(link, r, "Failed to configure link: %m");
2759 }
2760
2761 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
2762
2763 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
2764 * even if the method fails. */
2765 manager->has_product_uuid = true;
2766
2767 return 1;
2768 }
2769
2770 static bool link_requires_uuid(Link *link) {
2771 const DUID *duid;
2772
2773 assert(link);
2774 assert(link->manager);
2775 assert(link->network);
2776
2777 duid = link_get_duid(link);
2778 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
2779 return false;
2780
2781 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
2782 return true;
2783
2784 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
2785 return true;
2786
2787 return false;
2788 }
2789
2790 static int link_configure_duid(Link *link) {
2791 Manager *m;
2792 DUID *duid;
2793 int r;
2794
2795 assert(link);
2796 assert(link->manager);
2797 assert(link->network);
2798
2799 m = link->manager;
2800 duid = link_get_duid(link);
2801
2802 if (!link_requires_uuid(link))
2803 return 1;
2804
2805 if (m->has_product_uuid) {
2806 (void) duid_set_uuid(duid, m->product_uuid);
2807 return 1;
2808 }
2809
2810 if (!m->links_requesting_uuid) {
2811 r = manager_request_product_uuid(m, link);
2812 if (r < 0) {
2813 if (r == -ENOMEM)
2814 return r;
2815
2816 log_link_warning_errno(link, r,
2817 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
2818 return 1;
2819 }
2820 } else {
2821 r = set_put(m->links_requesting_uuid, link);
2822 if (r < 0)
2823 return log_oom();
2824
2825 r = set_put(m->duids_requesting_uuid, duid);
2826 if (r < 0)
2827 return log_oom();
2828 }
2829
2830 return 0;
2831 }
2832
2833 static int link_initialized_and_synced(Link *link) {
2834 Network *network;
2835 int r;
2836
2837 assert(link);
2838 assert(link->ifname);
2839 assert(link->manager);
2840
2841 /* We may get called either from the asynchronous netlink callback,
2842 * or directly for link_add() if running in a container. See link_add(). */
2843 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
2844 return 0;
2845
2846 log_link_debug(link, "Link state is up-to-date");
2847 link_set_state(link, LINK_STATE_INITIALIZED);
2848
2849 r = link_new_bound_by_list(link);
2850 if (r < 0)
2851 return r;
2852
2853 r = link_handle_bound_by_list(link);
2854 if (r < 0)
2855 return r;
2856
2857 if (!link->network) {
2858 r = network_get(link->manager, link->sd_device, link->ifname,
2859 &link->mac, &network);
2860 if (r == -ENOENT) {
2861 link_enter_unmanaged(link);
2862 return 0;
2863 } else if (r == 0 && network->unmanaged) {
2864 link_enter_unmanaged(link);
2865 return 0;
2866 } else if (r < 0)
2867 return r;
2868
2869 if (link->flags & IFF_LOOPBACK) {
2870 if (network->link_local != ADDRESS_FAMILY_NO)
2871 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2872
2873 if (network->dhcp != ADDRESS_FAMILY_NO)
2874 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2875
2876 if (network->dhcp_server)
2877 log_link_debug(link, "Ignoring DHCP server for loopback link");
2878 }
2879
2880 r = network_apply(network, link);
2881 if (r < 0)
2882 return r;
2883 }
2884
2885 r = link_new_bound_to_list(link);
2886 if (r < 0)
2887 return r;
2888
2889 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
2890 * link_configure() is called later asynchronously. */
2891 r = link_configure_duid(link);
2892 if (r <= 0)
2893 return r;
2894
2895 r = link_configure(link);
2896 if (r < 0)
2897 return r;
2898
2899 return 0;
2900 }
2901
2902 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2903 (void) link_initialized_and_synced(link);
2904 return 1;
2905 }
2906
2907 int link_initialized(Link *link, sd_device *device) {
2908 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2909 int r;
2910
2911 assert(link);
2912 assert(link->manager);
2913 assert(link->manager->rtnl);
2914 assert(device);
2915
2916 if (link->state != LINK_STATE_PENDING)
2917 return 0;
2918
2919 if (link->sd_device)
2920 return 0;
2921
2922 log_link_debug(link, "udev initialized link");
2923 link_set_state(link, LINK_STATE_INITIALIZED);
2924
2925 link->sd_device = sd_device_ref(device);
2926
2927 /* udev has initialized the link, but we don't know if we have yet
2928 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2929 * when it returns we know that the pending NEWLINKs have already been
2930 * processed and that we are up-to-date */
2931
2932 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2933 link->ifindex);
2934 if (r < 0)
2935 return r;
2936
2937 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
2938 link_netlink_destroy_callback, link);
2939 if (r < 0)
2940 return r;
2941
2942 link_ref(link);
2943
2944 return 0;
2945 }
2946
2947 static int link_load(Link *link) {
2948 _cleanup_free_ char *network_file = NULL,
2949 *addresses = NULL,
2950 *routes = NULL,
2951 *dhcp4_address = NULL,
2952 *ipv4ll_address = NULL;
2953 union in_addr_union address;
2954 union in_addr_union route_dst;
2955 const char *p;
2956 int r;
2957
2958 assert(link);
2959
2960 r = parse_env_file(NULL, link->state_file,
2961 "NETWORK_FILE", &network_file,
2962 "ADDRESSES", &addresses,
2963 "ROUTES", &routes,
2964 "DHCP4_ADDRESS", &dhcp4_address,
2965 "IPV4LL_ADDRESS", &ipv4ll_address);
2966 if (r < 0 && r != -ENOENT)
2967 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
2968
2969 if (network_file) {
2970 Network *network;
2971 char *suffix;
2972
2973 /* drop suffix */
2974 suffix = strrchr(network_file, '.');
2975 if (!suffix) {
2976 log_link_debug(link, "Failed to get network name from %s", network_file);
2977 goto network_file_fail;
2978 }
2979 *suffix = '\0';
2980
2981 r = network_get_by_name(link->manager, basename(network_file), &network);
2982 if (r < 0) {
2983 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
2984 goto network_file_fail;
2985 }
2986
2987 r = network_apply(network, link);
2988 if (r < 0)
2989 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
2990 }
2991
2992 network_file_fail:
2993
2994 if (addresses) {
2995 p = addresses;
2996
2997 for (;;) {
2998 _cleanup_free_ char *address_str = NULL;
2999 char *prefixlen_str;
3000 int family;
3001 unsigned char prefixlen;
3002
3003 r = extract_first_word(&p, &address_str, NULL, 0);
3004 if (r < 0) {
3005 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3006 continue;
3007 }
3008 if (r == 0)
3009 break;
3010
3011 prefixlen_str = strchr(address_str, '/');
3012 if (!prefixlen_str) {
3013 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3014 continue;
3015 }
3016
3017 *prefixlen_str++ = '\0';
3018
3019 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3020 if (r != 1) {
3021 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3022 continue;
3023 }
3024
3025 r = in_addr_from_string_auto(address_str, &family, &address);
3026 if (r < 0) {
3027 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3028 continue;
3029 }
3030
3031 r = address_add(link, family, &address, prefixlen, NULL);
3032 if (r < 0)
3033 return log_link_error_errno(link, r, "Failed to add address: %m");
3034 }
3035 }
3036
3037 if (routes) {
3038 p = routes;
3039
3040 for (;;) {
3041 Route *route;
3042 _cleanup_free_ char *route_str = NULL;
3043 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3044 usec_t lifetime;
3045 char *prefixlen_str;
3046 int family;
3047 unsigned char prefixlen, tos, table;
3048 uint32_t priority;
3049
3050 r = extract_first_word(&p, &route_str, NULL, 0);
3051 if (r < 0) {
3052 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3053 continue;
3054 }
3055 if (r == 0)
3056 break;
3057
3058 prefixlen_str = strchr(route_str, '/');
3059 if (!prefixlen_str) {
3060 log_link_debug(link, "Failed to parse route %s", route_str);
3061 continue;
3062 }
3063
3064 *prefixlen_str++ = '\0';
3065
3066 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3067 if (r != 5) {
3068 log_link_debug(link,
3069 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3070 prefixlen_str);
3071 continue;
3072 }
3073
3074 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3075 if (r < 0) {
3076 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3077 continue;
3078 }
3079
3080 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3081 if (r < 0)
3082 return log_link_error_errno(link, r, "Failed to add route: %m");
3083
3084 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3085 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3086 0, route_expire_handler, route);
3087 if (r < 0)
3088 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3089 }
3090
3091 route->lifetime = lifetime;
3092 sd_event_source_unref(route->expire);
3093 route->expire = TAKE_PTR(expire);
3094 }
3095 }
3096
3097 if (dhcp4_address) {
3098 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3099 if (r < 0) {
3100 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3101 goto dhcp4_address_fail;
3102 }
3103
3104 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3105 if (r < 0)
3106 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3107
3108 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3109 if (r < 0)
3110 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3111 }
3112
3113 dhcp4_address_fail:
3114
3115 if (ipv4ll_address) {
3116 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3117 if (r < 0) {
3118 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3119 goto ipv4ll_address_fail;
3120 }
3121
3122 r = sd_ipv4ll_new(&link->ipv4ll);
3123 if (r < 0)
3124 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3125
3126 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3127 if (r < 0)
3128 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3129 }
3130
3131 ipv4ll_address_fail:
3132
3133 return 0;
3134 }
3135
3136 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3137 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3138 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3139 Link *link;
3140 int r;
3141
3142 assert(m);
3143 assert(m->rtnl);
3144 assert(message);
3145 assert(ret);
3146
3147 r = link_new(m, message, ret);
3148 if (r < 0)
3149 return r;
3150
3151 link = *ret;
3152
3153 log_link_debug(link, "Link %d added", link->ifindex);
3154
3155 r = link_load(link);
3156 if (r < 0)
3157 return r;
3158
3159 if (detect_container() <= 0) {
3160 /* not in a container, udev will be around */
3161 sprintf(ifindex_str, "n%d", link->ifindex);
3162 r = sd_device_new_from_device_id(&device, ifindex_str);
3163 if (r < 0) {
3164 log_link_warning_errno(link, r, "Could not find device: %m");
3165 goto failed;
3166 }
3167
3168 r = sd_device_get_is_initialized(device);
3169 if (r < 0) {
3170 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3171 goto failed;
3172 }
3173 if (r == 0) {
3174 /* not yet ready */
3175 log_link_debug(link, "link pending udev initialization...");
3176 return 0;
3177 }
3178
3179 r = device_is_renaming(device);
3180 if (r < 0) {
3181 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3182 goto failed;
3183 }
3184 if (r > 0) {
3185 log_link_debug(link, "Interface is under renaming, pending initialization.");
3186 return 0;
3187 }
3188
3189 r = link_initialized(link, device);
3190 if (r < 0)
3191 goto failed;
3192 } else {
3193 r = link_initialized_and_synced(link);
3194 if (r < 0)
3195 goto failed;
3196 }
3197
3198 return 0;
3199 failed:
3200 link_enter_failed(link);
3201 return r;
3202 }
3203
3204 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3205 int r;
3206
3207 assert(link);
3208
3209 log_link_info(link, "Gained IPv6LL");
3210
3211 link->ipv6ll_address = *address;
3212 link_check_ready(link);
3213
3214 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3215 r = link_acquire_ipv6_conf(link);
3216 if (r < 0) {
3217 link_enter_failed(link);
3218 return r;
3219 }
3220 }
3221
3222 return 0;
3223 }
3224
3225 static int link_carrier_gained(Link *link) {
3226 int r;
3227
3228 assert(link);
3229
3230 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3231 r = link_acquire_conf(link);
3232 if (r < 0) {
3233 link_enter_failed(link);
3234 return r;
3235 }
3236
3237 r = link_request_set_addresses(link);
3238 if (r < 0)
3239 return r;
3240 }
3241
3242 r = link_handle_bound_by_list(link);
3243 if (r < 0)
3244 return r;
3245
3246 return 0;
3247 }
3248
3249 static int link_carrier_lost(Link *link) {
3250 int r;
3251
3252 assert(link);
3253
3254 if (link->network && link->network->ignore_carrier_loss)
3255 return 0;
3256
3257 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3258 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3259 * configuration and stop the clients as well. */
3260 if (link->setting_mtu)
3261 return 0;
3262
3263 r = link_stop_clients(link);
3264 if (r < 0) {
3265 link_enter_failed(link);
3266 return r;
3267 }
3268
3269 if (link_dhcp4_server_enabled(link))
3270 (void) sd_dhcp_server_stop(link->dhcp_server);
3271
3272 r = link_drop_config(link);
3273 if (r < 0)
3274 return r;
3275
3276 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3277 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3278 r = link_drop_foreign_config(link);
3279 if (r < 0)
3280 return r;
3281 }
3282
3283 r = link_handle_bound_by_list(link);
3284 if (r < 0)
3285 return r;
3286
3287 return 0;
3288 }
3289
3290 int link_carrier_reset(Link *link) {
3291 int r;
3292
3293 assert(link);
3294
3295 if (link_has_carrier(link)) {
3296 r = link_carrier_lost(link);
3297 if (r < 0)
3298 return r;
3299
3300 r = link_carrier_gained(link);
3301 if (r < 0)
3302 return r;
3303
3304 log_link_info(link, "Reset carrier");
3305 }
3306
3307 return 0;
3308 }
3309
3310 int link_update(Link *link, sd_netlink_message *m) {
3311 struct ether_addr mac;
3312 const char *ifname;
3313 uint32_t mtu;
3314 bool had_carrier, carrier_gained, carrier_lost;
3315 int old_master, r;
3316
3317 assert(link);
3318 assert(link->ifname);
3319 assert(m);
3320
3321 if (link->state == LINK_STATE_LINGER) {
3322 log_link_info(link, "Link re-added");
3323 link_set_state(link, LINK_STATE_CONFIGURING);
3324
3325 r = link_new_carrier_maps(link);
3326 if (r < 0)
3327 return r;
3328 }
3329
3330 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3331 if (r >= 0 && !streq(ifname, link->ifname)) {
3332 Manager *manager = link->manager;
3333
3334 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3335
3336 link_drop(link);
3337 r = link_add(manager, m, &link);
3338 if (r < 0)
3339 return r;
3340 }
3341
3342 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3343 if (r >= 0 && mtu > 0) {
3344 link->mtu = mtu;
3345 if (link->original_mtu == 0) {
3346 link->original_mtu = mtu;
3347 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3348 }
3349
3350 if (link->dhcp_client) {
3351 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3352 link->mtu);
3353 if (r < 0)
3354 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3355 }
3356
3357 if (link->radv) {
3358 r = sd_radv_set_mtu(link->radv, link->mtu);
3359 if (r < 0)
3360 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3361 }
3362 }
3363
3364 /* The kernel may broadcast NEWLINK messages without the MAC address
3365 set, simply ignore them. */
3366 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3367 if (r >= 0) {
3368 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3369 ETH_ALEN)) {
3370
3371 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3372 ETH_ALEN);
3373
3374 log_link_debug(link, "MAC address: "
3375 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3376 mac.ether_addr_octet[0],
3377 mac.ether_addr_octet[1],
3378 mac.ether_addr_octet[2],
3379 mac.ether_addr_octet[3],
3380 mac.ether_addr_octet[4],
3381 mac.ether_addr_octet[5]);
3382
3383 if (link->ipv4ll) {
3384 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3385 if (r < 0)
3386 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3387 }
3388
3389 if (link->dhcp_client) {
3390 r = sd_dhcp_client_set_mac(link->dhcp_client,
3391 (const uint8_t *) &link->mac,
3392 sizeof (link->mac),
3393 ARPHRD_ETHER);
3394 if (r < 0)
3395 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3396
3397 r = dhcp4_set_client_identifier(link);
3398 if (r < 0)
3399 return r;
3400 }
3401
3402 if (link->dhcp6_client) {
3403 const DUID* duid = link_get_duid(link);
3404
3405 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3406 (const uint8_t *) &link->mac,
3407 sizeof (link->mac),
3408 ARPHRD_ETHER);
3409 if (r < 0)
3410 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3411
3412 if (link->network->iaid_set) {
3413 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3414 link->network->iaid);
3415 if (r < 0)
3416 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3417 }
3418
3419 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3420 duid->type,
3421 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3422 duid->raw_data_len);
3423 if (r < 0)
3424 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3425 }
3426
3427 if (link->radv) {
3428 r = sd_radv_set_mac(link->radv, &link->mac);
3429 if (r < 0)
3430 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3431 }
3432
3433 if (link->ndisc) {
3434 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3435 if (r < 0)
3436 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3437 }
3438 }
3439 }
3440
3441 old_master = link->master_ifindex;
3442 (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
3443
3444 had_carrier = link_has_carrier(link);
3445
3446 r = link_update_flags(link, m, old_master != link->master_ifindex);
3447 if (r < 0)
3448 return r;
3449
3450 r = link_update_lldp(link);
3451 if (r < 0)
3452 return r;
3453
3454 carrier_gained = !had_carrier && link_has_carrier(link);
3455 carrier_lost = had_carrier && !link_has_carrier(link);
3456
3457 if (carrier_gained) {
3458 log_link_info(link, "Gained carrier");
3459
3460 r = link_carrier_gained(link);
3461 if (r < 0)
3462 return r;
3463 } else if (carrier_lost) {
3464 log_link_info(link, "Lost carrier");
3465
3466 r = link_carrier_lost(link);
3467 if (r < 0)
3468 return r;
3469 }
3470
3471 return 0;
3472 }
3473
3474 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3475 bool space = false;
3476 Iterator i;
3477 Link *link;
3478
3479 assert(f);
3480 assert(prefix);
3481
3482 if (hashmap_isempty(h))
3483 return;
3484
3485 fputs(prefix, f);
3486 HASHMAP_FOREACH(link, h, i) {
3487 if (space)
3488 fputc(' ', f);
3489
3490 fprintf(f, "%i", link->ifindex);
3491 space = true;
3492 }
3493
3494 fputc('\n', f);
3495 }
3496
3497 int link_save(Link *link) {
3498 _cleanup_free_ char *temp_path = NULL;
3499 _cleanup_fclose_ FILE *f = NULL;
3500 const char *admin_state, *oper_state;
3501 Address *a;
3502 Route *route;
3503 Iterator i;
3504 int r;
3505
3506 assert(link);
3507 assert(link->state_file);
3508 assert(link->lease_file);
3509 assert(link->manager);
3510
3511 if (link->state == LINK_STATE_LINGER) {
3512 (void) unlink(link->state_file);
3513 return 0;
3514 }
3515
3516 link_lldp_save(link);
3517
3518 admin_state = link_state_to_string(link->state);
3519 assert(admin_state);
3520
3521 oper_state = link_operstate_to_string(link->operstate);
3522 assert(oper_state);
3523
3524 r = fopen_temporary(link->state_file, &f, &temp_path);
3525 if (r < 0)
3526 goto fail;
3527
3528 (void) fchmod(fileno(f), 0644);
3529
3530 fprintf(f,
3531 "# This is private data. Do not parse.\n"
3532 "ADMIN_STATE=%s\n"
3533 "OPER_STATE=%s\n",
3534 admin_state, oper_state);
3535
3536 if (link->network) {
3537 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
3538 const char *dhcp_domainname = NULL, *p;
3539 sd_dhcp6_lease *dhcp6_lease = NULL;
3540 unsigned j;
3541 bool space;
3542
3543 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3544 yes_no(link->network->required_for_online));
3545
3546 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
3547 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
3548
3549 if (link->dhcp6_client) {
3550 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3551 if (r < 0 && r != -ENOMSG)
3552 log_link_debug(link, "No DHCPv6 lease");
3553 }
3554
3555 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3556
3557 fputs("DNS=", f);
3558 space = false;
3559
3560 for (j = 0; j < link->network->n_dns; j++) {
3561 _cleanup_free_ char *b = NULL;
3562
3563 r = in_addr_to_string(link->network->dns[j].family,
3564 &link->network->dns[j].address, &b);
3565 if (r < 0) {
3566 log_debug_errno(r, "Failed to format address, ignoring: %m");
3567 continue;
3568 }
3569
3570 if (space)
3571 fputc(' ', f);
3572 fputs(b, f);
3573 space = true;
3574 }
3575
3576 if (link->network->dhcp_use_dns &&
3577 link->dhcp_lease) {
3578 const struct in_addr *addresses;
3579
3580 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3581 if (r > 0)
3582 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3583 space = true;
3584 }
3585
3586 if (link->network->dhcp_use_dns && dhcp6_lease) {
3587 struct in6_addr *in6_addrs;
3588
3589 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3590 if (r > 0) {
3591 if (space)
3592 fputc(' ', f);
3593 serialize_in6_addrs(f, in6_addrs, r);
3594 space = true;
3595 }
3596 }
3597
3598 /* Make sure to flush out old entries before we use the NDISC data */
3599 ndisc_vacuum(link);
3600
3601 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3602 NDiscRDNSS *dd;
3603
3604 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3605 if (space)
3606 fputc(' ', f);
3607
3608 serialize_in6_addrs(f, &dd->address, 1);
3609 space = true;
3610 }
3611 }
3612
3613 fputc('\n', f);
3614
3615 fputs("NTP=", f);
3616 space = false;
3617 fputstrv(f, link->network->ntp, NULL, &space);
3618
3619 if (link->network->dhcp_use_ntp &&
3620 link->dhcp_lease) {
3621 const struct in_addr *addresses;
3622
3623 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3624 if (r > 0)
3625 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3626 space = true;
3627 }
3628
3629 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3630 struct in6_addr *in6_addrs;
3631 char **hosts;
3632
3633 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3634 &in6_addrs);
3635 if (r > 0) {
3636 if (space)
3637 fputc(' ', f);
3638 serialize_in6_addrs(f, in6_addrs, r);
3639 space = true;
3640 }
3641
3642 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3643 if (r > 0)
3644 fputstrv(f, hosts, NULL, &space);
3645 }
3646
3647 fputc('\n', f);
3648
3649 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3650 if (link->dhcp_lease) {
3651 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3652 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3653 }
3654 if (dhcp6_lease)
3655 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3656 }
3657
3658 fputs("DOMAINS=", f);
3659 space = false;
3660 ORDERED_SET_FOREACH(p, link->network->search_domains, i)
3661 fputs_with_space(f, p, NULL, &space);
3662
3663 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3664 NDiscDNSSL *dd;
3665
3666 if (dhcp_domainname)
3667 fputs_with_space(f, dhcp_domainname, NULL, &space);
3668 if (dhcp_domains)
3669 fputstrv(f, dhcp_domains, NULL, &space);
3670 if (dhcp6_domains)
3671 fputstrv(f, dhcp6_domains, NULL, &space);
3672
3673 SET_FOREACH(dd, link->ndisc_dnssl, i)
3674 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3675 }
3676
3677 fputc('\n', f);
3678
3679 fputs("ROUTE_DOMAINS=", f);
3680 space = false;
3681 ORDERED_SET_FOREACH(p, link->network->route_domains, i)
3682 fputs_with_space(f, p, NULL, &space);
3683
3684 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3685 NDiscDNSSL *dd;
3686
3687 if (dhcp_domainname)
3688 fputs_with_space(f, dhcp_domainname, NULL, &space);
3689 if (dhcp_domains)
3690 fputstrv(f, dhcp_domains, NULL, &space);
3691 if (dhcp6_domains)
3692 fputstrv(f, dhcp6_domains, NULL, &space);
3693
3694 SET_FOREACH(dd, link->ndisc_dnssl, i)
3695 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3696 }
3697
3698 fputc('\n', f);
3699
3700 fprintf(f, "LLMNR=%s\n",
3701 resolve_support_to_string(link->network->llmnr));
3702 fprintf(f, "MDNS=%s\n",
3703 resolve_support_to_string(link->network->mdns));
3704 if (link->network->dns_default_route >= 0)
3705 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
3706
3707 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3708 fprintf(f, "DNS_OVER_TLS=%s\n",
3709 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
3710
3711 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3712 fprintf(f, "DNSSEC=%s\n",
3713 dnssec_mode_to_string(link->network->dnssec_mode));
3714
3715 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3716 const char *n;
3717
3718 fputs("DNSSEC_NTA=", f);
3719 space = false;
3720 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3721 fputs_with_space(f, n, NULL, &space);
3722 fputc('\n', f);
3723 }
3724
3725 fputs("ADDRESSES=", f);
3726 space = false;
3727 SET_FOREACH(a, link->addresses, i) {
3728 _cleanup_free_ char *address_str = NULL;
3729
3730 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3731 if (r < 0)
3732 goto fail;
3733
3734 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3735 space = true;
3736 }
3737 fputc('\n', f);
3738
3739 fputs("ROUTES=", f);
3740 space = false;
3741 SET_FOREACH(route, link->routes, i) {
3742 _cleanup_free_ char *route_str = NULL;
3743
3744 r = in_addr_to_string(route->family, &route->dst, &route_str);
3745 if (r < 0)
3746 goto fail;
3747
3748 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
3749 space ? " " : "", route_str,
3750 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3751 space = true;
3752 }
3753
3754 fputc('\n', f);
3755 }
3756
3757 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3758 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3759
3760 if (link->dhcp_lease) {
3761 struct in_addr address;
3762 const char *tz = NULL;
3763
3764 assert(link->network);
3765
3766 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3767 if (r >= 0)
3768 fprintf(f, "TIMEZONE=%s\n", tz);
3769
3770 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3771 if (r >= 0) {
3772 fputs("DHCP4_ADDRESS=", f);
3773 serialize_in_addrs(f, &address, 1, false, NULL);
3774 fputc('\n', f);
3775 }
3776
3777 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3778 if (r < 0)
3779 goto fail;
3780
3781 fprintf(f,
3782 "DHCP_LEASE=%s\n",
3783 link->lease_file);
3784 } else
3785 (void) unlink(link->lease_file);
3786
3787 if (link->ipv4ll) {
3788 struct in_addr address;
3789
3790 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3791 if (r >= 0) {
3792 fputs("IPV4LL_ADDRESS=", f);
3793 serialize_in_addrs(f, &address, 1, false, NULL);
3794 fputc('\n', f);
3795 }
3796 }
3797
3798 r = fflush_and_check(f);
3799 if (r < 0)
3800 goto fail;
3801
3802 if (rename(temp_path, link->state_file) < 0) {
3803 r = -errno;
3804 goto fail;
3805 }
3806
3807 return 0;
3808
3809 fail:
3810 (void) unlink(link->state_file);
3811 if (temp_path)
3812 (void) unlink(temp_path);
3813
3814 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3815 }
3816
3817 /* The serialized state in /run is no longer up-to-date. */
3818 void link_dirty(Link *link) {
3819 int r;
3820
3821 assert(link);
3822
3823 /* mark manager dirty as link is dirty */
3824 manager_dirty(link->manager);
3825
3826 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3827 if (r < 0)
3828 /* allocation errors are ignored */
3829 return;
3830
3831 r = set_put(link->manager->dirty_links, link);
3832 if (r <= 0)
3833 /* don't take another ref if the link was already dirty */
3834 return;
3835
3836 link_ref(link);
3837 }
3838
3839 /* The serialized state in /run is up-to-date */
3840 void link_clean(Link *link) {
3841 assert(link);
3842 assert(link->manager);
3843
3844 link_unref(set_remove(link->manager->dirty_links, link));
3845 }
3846
3847 static const char* const link_state_table[_LINK_STATE_MAX] = {
3848 [LINK_STATE_PENDING] = "pending",
3849 [LINK_STATE_INITIALIZED] = "initialized",
3850 [LINK_STATE_CONFIGURING] = "configuring",
3851 [LINK_STATE_CONFIGURED] = "configured",
3852 [LINK_STATE_UNMANAGED] = "unmanaged",
3853 [LINK_STATE_FAILED] = "failed",
3854 [LINK_STATE_LINGER] = "linger",
3855 };
3856
3857 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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