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LLDP: Fix logs for LLDP
[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 <linux/can/netlink.h>
6 #include <unistd.h>
7
8 #include "alloc-util.h"
9 #include "bus-util.h"
10 #include "dhcp-identifier.h"
11 #include "dhcp-lease-internal.h"
12 #include "env-file.h"
13 #include "fd-util.h"
14 #include "fileio.h"
15 #include "missing_network.h"
16 #include "netdev/vrf.h"
17 #include "netlink-util.h"
18 #include "network-internal.h"
19 #include "networkd-ipv6-proxy-ndp.h"
20 #include "networkd-lldp-tx.h"
21 #include "networkd-manager.h"
22 #include "networkd-ndisc.h"
23 #include "networkd-neighbor.h"
24 #include "networkd-radv.h"
25 #include "networkd-routing-policy-rule.h"
26 #include "set.h"
27 #include "socket-util.h"
28 #include "stdio-util.h"
29 #include "string-table.h"
30 #include "strv.h"
31 #include "sysctl-util.h"
32 #include "tmpfile-util.h"
33 #include "udev-util.h"
34 #include "util.h"
35 #include "virt.h"
36
37 uint32_t link_get_vrf_table(Link *link) {
38 return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
39 }
40
41 uint32_t link_get_dhcp_route_table(Link *link) {
42 /* When the interface is part of an VRF use the VRFs routing table, unless
43 * another table is explicitly specified. */
44 if (link->network->dhcp_route_table_set)
45 return link->network->dhcp_route_table;
46 return link_get_vrf_table(link);
47 }
48
49 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
50 if (link->network->ipv6_accept_ra_route_table_set)
51 return link->network->ipv6_accept_ra_route_table;
52 return link_get_vrf_table(link);
53 }
54
55 DUID* link_get_duid(Link *link) {
56 if (link->network->duid.type != _DUID_TYPE_INVALID)
57 return &link->network->duid;
58 else
59 return &link->manager->duid;
60 }
61
62 static bool link_dhcp6_enabled(Link *link) {
63 assert(link);
64
65 if (!socket_ipv6_is_supported())
66 return false;
67
68 if (link->flags & IFF_LOOPBACK)
69 return false;
70
71 if (!link->network)
72 return false;
73
74 if (link->network->bond)
75 return false;
76
77 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
78 return false;
79
80 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
81 }
82
83 static bool link_dhcp4_enabled(Link *link) {
84 assert(link);
85
86 if (link->flags & IFF_LOOPBACK)
87 return false;
88
89 if (!link->network)
90 return false;
91
92 if (link->network->bond)
93 return false;
94
95 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
96 }
97
98 static bool link_dhcp4_server_enabled(Link *link) {
99 assert(link);
100
101 if (link->flags & IFF_LOOPBACK)
102 return false;
103
104 if (!link->network)
105 return false;
106
107 if (link->network->bond)
108 return false;
109
110 return link->network->dhcp_server;
111 }
112
113 bool link_ipv4ll_enabled(Link *link) {
114 assert(link);
115
116 if (link->flags & IFF_LOOPBACK)
117 return false;
118
119 if (!link->network)
120 return false;
121
122 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard"))
123 return false;
124
125 if (link->network->bond)
126 return false;
127
128 return link->network->link_local & ADDRESS_FAMILY_IPV4;
129 }
130
131 bool link_ipv4ll_fallback_enabled(Link *link) {
132 assert(link);
133
134 if (link->flags & IFF_LOOPBACK)
135 return false;
136
137 if (!link->network)
138 return false;
139
140 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard"))
141 return false;
142
143 if (link->network->bond)
144 return false;
145
146 return link->network->link_local & ADDRESS_FAMILY_FALLBACK_IPV4;
147 }
148
149 static bool link_ipv6ll_enabled(Link *link) {
150 assert(link);
151
152 if (!socket_ipv6_is_supported())
153 return false;
154
155 if (link->flags & IFF_LOOPBACK)
156 return false;
157
158 if (!link->network)
159 return false;
160
161 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard"))
162 return false;
163
164 if (link->network->bond)
165 return false;
166
167 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
168 return false;
169
170 return link->network->link_local & ADDRESS_FAMILY_IPV6;
171 }
172
173 static bool link_ipv6_enabled(Link *link) {
174 assert(link);
175
176 if (!socket_ipv6_is_supported())
177 return false;
178
179 if (link->network->bond)
180 return false;
181
182 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
183 return false;
184
185 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
186 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
187 }
188
189 static bool link_radv_enabled(Link *link) {
190 assert(link);
191
192 if (!link_ipv6ll_enabled(link))
193 return false;
194
195 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
196 }
197
198 static bool link_lldp_rx_enabled(Link *link) {
199 assert(link);
200
201 if (link->flags & IFF_LOOPBACK)
202 return false;
203
204 if (link->iftype != ARPHRD_ETHER)
205 return false;
206
207 if (!link->network)
208 return false;
209
210 /* LLDP should be handled on bridge slaves as those have a direct
211 * connection to their peers not on the bridge master. Linux doesn't
212 * even (by default) forward lldp packets to the bridge master.*/
213 if (streq_ptr("bridge", link->kind))
214 return false;
215
216 return link->network->lldp_mode != LLDP_MODE_NO;
217 }
218
219 static bool link_ipv4_forward_enabled(Link *link) {
220 assert(link);
221
222 if (link->flags & IFF_LOOPBACK)
223 return false;
224
225 if (!link->network)
226 return false;
227
228 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
229 return false;
230
231 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
232 }
233
234 static bool link_ipv6_forward_enabled(Link *link) {
235 assert(link);
236
237 if (!socket_ipv6_is_supported())
238 return false;
239
240 if (link->flags & IFF_LOOPBACK)
241 return false;
242
243 if (!link->network)
244 return false;
245
246 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
247 return false;
248
249 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
250 return false;
251
252 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
253 }
254
255 static bool link_proxy_arp_enabled(Link *link) {
256 assert(link);
257
258 if (link->flags & IFF_LOOPBACK)
259 return false;
260
261 if (!link->network)
262 return false;
263
264 if (link->network->proxy_arp < 0)
265 return false;
266
267 return true;
268 }
269
270 static bool link_ipv6_accept_ra_enabled(Link *link) {
271 assert(link);
272
273 if (!socket_ipv6_is_supported())
274 return false;
275
276 if (link->flags & IFF_LOOPBACK)
277 return false;
278
279 if (!link->network)
280 return false;
281
282 if (!link_ipv6ll_enabled(link))
283 return false;
284
285 /* If unset use system default (enabled if local forwarding is disabled.
286 * disabled if local forwarding is enabled).
287 * If set, ignore or enforce RA independent of local forwarding state.
288 */
289 if (link->network->ipv6_accept_ra < 0)
290 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
291 return !link_ipv6_forward_enabled(link);
292 else if (link->network->ipv6_accept_ra > 0)
293 /* accept RA even if ip_forward is enabled */
294 return true;
295 else
296 /* ignore RA */
297 return false;
298 }
299
300 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
301 assert(link);
302
303 if (!socket_ipv6_is_supported())
304 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
305
306 if (link->flags & IFF_LOOPBACK)
307 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
308
309 if (!link->network)
310 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
311
312 return link->network->ipv6_privacy_extensions;
313 }
314
315 static int link_enable_ipv6(Link *link) {
316 bool disabled;
317 int r;
318
319 if (link->flags & IFF_LOOPBACK)
320 return 0;
321
322 disabled = !link_ipv6_enabled(link);
323
324 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", disabled);
325 if (r < 0)
326 log_link_warning_errno(link, r, "Cannot %s IPv6: %m", enable_disable(!disabled));
327 else
328 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
329
330 return 0;
331 }
332
333 static bool link_is_enslaved(Link *link) {
334 if (link->flags & IFF_SLAVE)
335 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
336 return true;
337
338 if (!link->enslaved_raw)
339 return false;
340
341 if (!link->network)
342 return false;
343
344 if (link->network->bridge)
345 /* TODO: support the case when link is not managed by networkd. */
346 return true;
347
348 return false;
349 }
350
351 static void link_update_master_operstate(Link *link, NetDev *netdev) {
352 Link *master;
353
354 if (!netdev)
355 return;
356
357 if (link_get(link->manager, netdev->ifindex, &master) < 0)
358 return;
359
360 link_update_operstate(master, true);
361 }
362
363 void link_update_operstate(Link *link, bool also_update_master) {
364 LinkOperationalState operstate;
365 Iterator i;
366
367 assert(link);
368
369 if (link->kernel_operstate == IF_OPER_DORMANT)
370 operstate = LINK_OPERSTATE_DORMANT;
371 else if (link_has_carrier(link)) {
372 Address *address;
373 uint8_t scope = RT_SCOPE_NOWHERE;
374
375 /* if we have carrier, check what addresses we have */
376 SET_FOREACH(address, link->addresses, i) {
377 if (!address_is_ready(address))
378 continue;
379
380 if (address->scope < scope)
381 scope = address->scope;
382 }
383
384 /* for operstate we also take foreign addresses into account */
385 SET_FOREACH(address, link->addresses_foreign, i) {
386 if (!address_is_ready(address))
387 continue;
388
389 if (address->scope < scope)
390 scope = address->scope;
391 }
392
393 if (scope < RT_SCOPE_SITE)
394 /* universally accessible addresses found */
395 operstate = LINK_OPERSTATE_ROUTABLE;
396 else if (scope < RT_SCOPE_HOST)
397 /* only link or site local addresses found */
398 operstate = LINK_OPERSTATE_DEGRADED;
399 else
400 /* no useful addresses found */
401 operstate = LINK_OPERSTATE_CARRIER;
402 } else if (link->flags & IFF_UP)
403 operstate = LINK_OPERSTATE_NO_CARRIER;
404 else
405 operstate = LINK_OPERSTATE_OFF;
406
407 if (IN_SET(operstate, LINK_OPERSTATE_DEGRADED, LINK_OPERSTATE_CARRIER) &&
408 link_is_enslaved(link))
409 operstate = LINK_OPERSTATE_ENSLAVED;
410
411 if (operstate >= LINK_OPERSTATE_CARRIER) {
412 Link *slave;
413
414 SET_FOREACH(slave, link->slaves, i) {
415 link_update_operstate(slave, false);
416
417 if (slave->operstate < LINK_OPERSTATE_CARRIER)
418 operstate = LINK_OPERSTATE_DEGRADED_CARRIER;
419 }
420 }
421
422 if (link->operstate != operstate) {
423 link->operstate = operstate;
424 link_send_changed(link, "OperationalState", NULL);
425 link_dirty(link);
426 }
427
428 if (also_update_master && link->network) {
429 link_update_master_operstate(link, link->network->bond);
430 link_update_master_operstate(link, link->network->bridge);
431 }
432 }
433
434 #define FLAG_STRING(string, flag, old, new) \
435 (((old ^ new) & flag) \
436 ? ((old & flag) ? (" -" string) : (" +" string)) \
437 : "")
438
439 static int link_update_flags(Link *link, sd_netlink_message *m) {
440 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
441 uint8_t operstate;
442 int r;
443
444 assert(link);
445
446 r = sd_rtnl_message_link_get_flags(m, &flags);
447 if (r < 0)
448 return log_link_warning_errno(link, r, "Could not get link flags: %m");
449
450 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
451 if (r < 0)
452 /* if we got a message without operstate, take it to mean
453 the state was unchanged */
454 operstate = link->kernel_operstate;
455
456 if ((link->flags == flags) && (link->kernel_operstate == operstate))
457 return 0;
458
459 if (link->flags != flags) {
460 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",
461 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
462 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
463 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
464 FLAG_STRING("UP", IFF_UP, link->flags, flags),
465 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
466 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
467 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
468 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
469 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
470 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
471 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
472 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
473 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
474 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
475 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
476 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
477 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
478 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
479 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
480
481 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
482 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
483 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
484 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
485 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
486 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
487 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
488 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
489
490 /* link flags are currently at most 18 bits, let's align to
491 * printing 20 */
492 if (unknown_flags_added)
493 log_link_debug(link,
494 "Unknown link flags gained: %#.5x (ignoring)",
495 unknown_flags_added);
496
497 if (unknown_flags_removed)
498 log_link_debug(link,
499 "Unknown link flags lost: %#.5x (ignoring)",
500 unknown_flags_removed);
501 }
502
503 link->flags = flags;
504 link->kernel_operstate = operstate;
505
506 link_update_operstate(link, true);
507
508 return 0;
509 }
510
511 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
512 _cleanup_(link_unrefp) Link *link = NULL;
513 uint16_t type;
514 const char *ifname, *kind = NULL;
515 int r, ifindex;
516 unsigned short iftype;
517
518 assert(manager);
519 assert(message);
520 assert(ret);
521
522 /* check for link kind */
523 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
524 if (r == 0) {
525 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
526 r = sd_netlink_message_exit_container(message);
527 if (r < 0)
528 return r;
529 }
530
531 r = sd_netlink_message_get_type(message, &type);
532 if (r < 0)
533 return r;
534 else if (type != RTM_NEWLINK)
535 return -EINVAL;
536
537 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
538 if (r < 0)
539 return r;
540 else if (ifindex <= 0)
541 return -EINVAL;
542
543 r = sd_rtnl_message_link_get_type(message, &iftype);
544 if (r < 0)
545 return r;
546
547 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
548 if (r < 0)
549 return r;
550
551 link = new(Link, 1);
552 if (!link)
553 return -ENOMEM;
554
555 *link = (Link) {
556 .n_ref = 1,
557 .manager = manager,
558 .state = LINK_STATE_PENDING,
559 .rtnl_extended_attrs = true,
560 .ifindex = ifindex,
561 .iftype = iftype,
562 };
563
564 link->ifname = strdup(ifname);
565 if (!link->ifname)
566 return -ENOMEM;
567
568 if (kind) {
569 link->kind = strdup(kind);
570 if (!link->kind)
571 return -ENOMEM;
572 }
573
574 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
575 if (r < 0)
576 log_link_debug_errno(link, r, "New device has no master, continuing without");
577
578 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
579 if (r < 0)
580 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
581
582 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
583 return -ENOMEM;
584
585 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
586 return -ENOMEM;
587
588 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
589 return -ENOMEM;
590
591 r = hashmap_ensure_allocated(&manager->links, NULL);
592 if (r < 0)
593 return r;
594
595 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
596 if (r < 0)
597 return r;
598
599 r = link_update_flags(link, message);
600 if (r < 0)
601 return r;
602
603 *ret = TAKE_PTR(link);
604
605 return 0;
606 }
607
608 static Link *link_free(Link *link) {
609 Address *address;
610
611 assert(link);
612
613 link->routes = set_free_with_destructor(link->routes, route_free);
614 link->routes_foreign = set_free_with_destructor(link->routes_foreign, route_free);
615
616 link->addresses = set_free_with_destructor(link->addresses, address_free);
617 link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free);
618
619 while ((address = link->pool_addresses)) {
620 LIST_REMOVE(addresses, link->pool_addresses, address);
621 address_free(address);
622 }
623
624 sd_dhcp_server_unref(link->dhcp_server);
625 sd_dhcp_client_unref(link->dhcp_client);
626 sd_dhcp_lease_unref(link->dhcp_lease);
627
628 link_lldp_emit_stop(link);
629
630 free(link->lease_file);
631
632 sd_lldp_unref(link->lldp);
633 free(link->lldp_file);
634
635 ndisc_flush(link);
636
637 sd_ipv4ll_unref(link->ipv4ll);
638 sd_dhcp6_client_unref(link->dhcp6_client);
639 sd_ndisc_unref(link->ndisc);
640 sd_radv_unref(link->radv);
641
642 free(link->ifname);
643 free(link->kind);
644
645 (void) unlink(link->state_file);
646 free(link->state_file);
647
648 sd_device_unref(link->sd_device);
649
650 hashmap_free(link->bound_to_links);
651 hashmap_free(link->bound_by_links);
652
653 set_free_with_destructor(link->slaves, link_unref);
654
655 network_unref(link->network);
656
657 return mfree(link);
658 }
659
660 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
661
662 int link_get(Manager *m, int ifindex, Link **ret) {
663 Link *link;
664
665 assert(m);
666 assert(ifindex);
667 assert(ret);
668
669 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
670 if (!link)
671 return -ENODEV;
672
673 *ret = link;
674
675 return 0;
676 }
677
678 static void link_set_state(Link *link, LinkState state) {
679 assert(link);
680
681 if (link->state == state)
682 return;
683
684 log_link_debug(link, "State changed: %s -> %s",
685 link_state_to_string(link->state),
686 link_state_to_string(state));
687
688 link->state = state;
689
690 link_send_changed(link, "AdministrativeState", NULL);
691 }
692
693 static void link_enter_unmanaged(Link *link) {
694 assert(link);
695
696 log_link_debug(link, "Unmanaged");
697
698 link_set_state(link, LINK_STATE_UNMANAGED);
699
700 link_dirty(link);
701 }
702
703 int link_stop_clients(Link *link) {
704 int r = 0, k;
705
706 assert(link);
707 assert(link->manager);
708 assert(link->manager->event);
709
710 if (link->dhcp_client) {
711 k = sd_dhcp_client_stop(link->dhcp_client);
712 if (k < 0)
713 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
714 }
715
716 if (link->ipv4ll) {
717 k = sd_ipv4ll_stop(link->ipv4ll);
718 if (k < 0)
719 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
720 }
721
722 if (link->dhcp6_client) {
723 k = sd_dhcp6_client_stop(link->dhcp6_client);
724 if (k < 0)
725 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
726 }
727
728 if (link->ndisc) {
729 k = sd_ndisc_stop(link->ndisc);
730 if (k < 0)
731 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
732 }
733
734 if (link->radv) {
735 k = sd_radv_stop(link->radv);
736 if (k < 0)
737 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
738 }
739
740 link_lldp_emit_stop(link);
741 return r;
742 }
743
744 void link_enter_failed(Link *link) {
745 assert(link);
746
747 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
748 return;
749
750 log_link_warning(link, "Failed");
751
752 link_set_state(link, LINK_STATE_FAILED);
753
754 link_stop_clients(link);
755
756 link_dirty(link);
757 }
758
759 static Address* link_find_dhcp_server_address(Link *link) {
760 Address *address;
761
762 assert(link);
763 assert(link->network);
764
765 /* The first statically configured address if there is any */
766 LIST_FOREACH(addresses, address, link->network->static_addresses) {
767
768 if (address->family != AF_INET)
769 continue;
770
771 if (in_addr_is_null(address->family, &address->in_addr))
772 continue;
773
774 return address;
775 }
776
777 /* If that didn't work, find a suitable address we got from the pool */
778 LIST_FOREACH(addresses, address, link->pool_addresses) {
779 if (address->family != AF_INET)
780 continue;
781
782 return address;
783 }
784
785 return NULL;
786 }
787
788 static int link_join_netdevs_after_configured(Link *link) {
789 NetDev *netdev;
790 Iterator i;
791 int r;
792
793 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
794 if (netdev->ifindex > 0)
795 /* Assume already enslaved. */
796 continue;
797
798 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
799 continue;
800
801 log_struct(LOG_DEBUG,
802 LOG_LINK_INTERFACE(link),
803 LOG_NETDEV_INTERFACE(netdev),
804 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
805
806 r = netdev_join(netdev, link, NULL);
807 if (r < 0)
808 return log_struct_errno(LOG_WARNING, r,
809 LOG_LINK_INTERFACE(link),
810 LOG_NETDEV_INTERFACE(netdev),
811 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
812 }
813
814 return 0;
815 }
816
817 static void link_enter_configured(Link *link) {
818 assert(link);
819 assert(link->network);
820
821 if (link->state != LINK_STATE_CONFIGURING)
822 return;
823
824 log_link_info(link, "Configured");
825
826 link_set_state(link, LINK_STATE_CONFIGURED);
827
828 (void) link_join_netdevs_after_configured(link);
829
830 link_dirty(link);
831 }
832
833 static int link_request_set_routing_policy_rule(Link *link) {
834 RoutingPolicyRule *rule, *rrule = NULL;
835 int r;
836
837 assert(link);
838 assert(link->network);
839
840 link_set_state(link, LINK_STATE_CONFIGURING);
841 link->routing_policy_rules_configured = false;
842
843 LIST_FOREACH(rules, rule, link->network->rules) {
844 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
845 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif,
846 rule->protocol, &rule->sport, &rule->dport, &rrule);
847 if (r == 0) {
848 (void) routing_policy_rule_make_local(link->manager, rrule);
849 continue;
850 }
851
852 r = routing_policy_rule_configure(rule, link, NULL, false);
853 if (r < 0) {
854 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
855 link_enter_failed(link);
856 return r;
857 }
858
859 link->routing_policy_rule_messages++;
860 }
861
862 routing_policy_rule_purge(link->manager, link);
863 if (link->routing_policy_rule_messages == 0) {
864 link->routing_policy_rules_configured = true;
865 link_check_ready(link);
866 } else
867 log_link_debug(link, "Setting routing policy rules");
868
869 return 0;
870 }
871
872 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
873 int r;
874
875 assert(link);
876 assert(link->route_messages > 0);
877 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
878 LINK_STATE_FAILED, LINK_STATE_LINGER));
879
880 link->route_messages--;
881
882 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
883 return 1;
884
885 r = sd_netlink_message_get_errno(m);
886 if (r < 0 && r != -EEXIST)
887 log_link_warning_errno(link, r, "Could not set route: %m");
888
889 if (link->route_messages == 0) {
890 log_link_debug(link, "Routes set");
891 link->static_routes_configured = true;
892 link_check_ready(link);
893 }
894
895 return 1;
896 }
897
898 int link_request_set_routes(Link *link) {
899 enum {
900 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
901 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
902 _PHASE_MAX
903 } phase;
904 Route *rt;
905 int r;
906
907 assert(link);
908 assert(link->network);
909 assert(link->addresses_configured);
910 assert(link->address_messages == 0);
911 assert(link->state != _LINK_STATE_INVALID);
912
913 link_set_state(link, LINK_STATE_CONFIGURING);
914 link->static_routes_configured = false;
915
916 r = link_request_set_routing_policy_rule(link);
917 if (r < 0)
918 return r;
919
920 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
921 for (phase = 0; phase < _PHASE_MAX; phase++)
922 LIST_FOREACH(routes, rt, link->network->static_routes) {
923
924 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
925 continue;
926
927 r = route_configure(rt, link, route_handler);
928 if (r < 0) {
929 log_link_warning_errno(link, r, "Could not set routes: %m");
930 link_enter_failed(link);
931 return r;
932 }
933
934 link->route_messages++;
935 }
936
937 if (link->route_messages == 0) {
938 link->static_routes_configured = true;
939 link_check_ready(link);
940 } else
941 log_link_debug(link, "Setting routes");
942
943 return 0;
944 }
945
946 void link_check_ready(Link *link) {
947 Address *a;
948 Iterator i;
949
950 assert(link);
951
952 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
953 return;
954
955 if (!link->network)
956 return;
957
958 if (!link->addresses_configured)
959 return;
960
961 if (!link->neighbors_configured)
962 return;
963
964 SET_FOREACH(a, link->addresses, i)
965 if (!address_is_ready(a))
966 return;
967
968 if (!link->addresses_ready) {
969 link->addresses_ready = true;
970 link_request_set_routes(link);
971 }
972
973 if (!link->static_routes_configured)
974 return;
975
976 if (!link->routing_policy_rules_configured)
977 return;
978
979 if (link_ipv4ll_enabled(link) && !(link->ipv4ll_address && link->ipv4ll_route))
980 return;
981
982 if (link_ipv6ll_enabled(link) &&
983 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
984 return;
985
986 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
987 !(link->dhcp4_configured || link->dhcp6_configured) &&
988 !(link_ipv4ll_fallback_enabled(link) && link->ipv4ll_address && link->ipv4ll_route))
989 /* When DHCP is enabled, at least one protocol must provide an address, or
990 * an IPv4ll fallback address must be configured. */
991 return;
992
993 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
994 return;
995
996 if (link->state != LINK_STATE_CONFIGURED)
997 link_enter_configured(link);
998
999 return;
1000 }
1001
1002 static int link_request_set_neighbors(Link *link) {
1003 Neighbor *neighbor;
1004 int r;
1005
1006 assert(link);
1007 assert(link->network);
1008 assert(link->state != _LINK_STATE_INVALID);
1009
1010 link_set_state(link, LINK_STATE_CONFIGURING);
1011 link->neighbors_configured = false;
1012
1013 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1014 r = neighbor_configure(neighbor, link, NULL);
1015 if (r < 0) {
1016 log_link_warning_errno(link, r, "Could not set neighbor: %m");
1017 link_enter_failed(link);
1018 return r;
1019 }
1020 }
1021
1022 if (link->neighbor_messages == 0) {
1023 link->neighbors_configured = true;
1024 link_check_ready(link);
1025 } else
1026 log_link_debug(link, "Setting neighbors");
1027
1028 return 0;
1029 }
1030
1031 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1032 int r;
1033
1034 assert(rtnl);
1035 assert(m);
1036 assert(link);
1037 assert(link->ifname);
1038 assert(link->address_messages > 0);
1039 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1040 LINK_STATE_FAILED, LINK_STATE_LINGER));
1041
1042 link->address_messages--;
1043
1044 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1045 return 1;
1046
1047 r = sd_netlink_message_get_errno(m);
1048 if (r < 0 && r != -EEXIST)
1049 log_link_warning_errno(link, r, "could not set address: %m");
1050 else if (r >= 0)
1051 manager_rtnl_process_address(rtnl, m, link->manager);
1052
1053 if (link->address_messages == 0) {
1054 log_link_debug(link, "Addresses set");
1055 link->addresses_configured = true;
1056 link_check_ready(link);
1057 }
1058
1059 return 1;
1060 }
1061
1062 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1063 _cleanup_free_ struct in_addr *addresses = NULL;
1064 size_t n_addresses = 0, n_allocated = 0;
1065 unsigned i;
1066
1067 log_debug("Copying DNS server information from %s", link->ifname);
1068
1069 if (!link->network)
1070 return 0;
1071
1072 for (i = 0; i < link->network->n_dns; i++) {
1073 struct in_addr ia;
1074
1075 /* Only look for IPv4 addresses */
1076 if (link->network->dns[i].family != AF_INET)
1077 continue;
1078
1079 ia = link->network->dns[i].address.in;
1080
1081 /* Never propagate obviously borked data */
1082 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1083 continue;
1084
1085 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1086 return log_oom();
1087
1088 addresses[n_addresses++] = ia;
1089 }
1090
1091 if (link->network->dhcp_use_dns && link->dhcp_lease) {
1092 const struct in_addr *da = NULL;
1093 int j, n;
1094
1095 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
1096 if (n > 0) {
1097
1098 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1099 return log_oom();
1100
1101 for (j = 0; j < n; j++)
1102 if (in4_addr_is_non_local(&da[j]))
1103 addresses[n_addresses++] = da[j];
1104 }
1105 }
1106
1107 if (n_addresses <= 0)
1108 return 0;
1109
1110 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
1111 }
1112
1113 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1114 _cleanup_free_ struct in_addr *addresses = NULL;
1115 size_t n_addresses = 0, n_allocated = 0;
1116 char **a;
1117
1118 if (!link->network)
1119 return 0;
1120
1121 log_debug("Copying NTP server information from %s", link->ifname);
1122
1123 STRV_FOREACH(a, link->network->ntp) {
1124 union in_addr_union ia;
1125
1126 /* Only look for IPv4 addresses */
1127 if (in_addr_from_string(AF_INET, *a, &ia) <= 0)
1128 continue;
1129
1130 /* Never propagate obviously borked data */
1131 if (in4_addr_is_null(&ia.in) || in4_addr_is_localhost(&ia.in))
1132 continue;
1133
1134 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1135 return log_oom();
1136
1137 addresses[n_addresses++] = ia.in;
1138 }
1139
1140 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1141 const struct in_addr *da = NULL;
1142 int j, n;
1143
1144 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1145 if (n > 0) {
1146
1147 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1148 return log_oom();
1149
1150 for (j = 0; j < n; j++)
1151 if (in4_addr_is_non_local(&da[j]))
1152 addresses[n_addresses++] = da[j];
1153 }
1154 }
1155
1156 if (n_addresses <= 0)
1157 return 0;
1158
1159 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1160 }
1161
1162 static int link_set_bridge_fdb(Link *link) {
1163 FdbEntry *fdb_entry;
1164 int r;
1165
1166 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1167 r = fdb_entry_configure(link, fdb_entry);
1168 if (r < 0)
1169 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1170 }
1171
1172 return 0;
1173 }
1174
1175 static int link_request_set_addresses(Link *link) {
1176 AddressLabel *label;
1177 Address *ad;
1178 int r;
1179
1180 assert(link);
1181 assert(link->network);
1182 assert(link->state != _LINK_STATE_INVALID);
1183
1184 link_set_state(link, LINK_STATE_CONFIGURING);
1185
1186 /* Reset all *_configured flags we are configuring. */
1187 link->addresses_configured = false;
1188 link->addresses_ready = false;
1189 link->neighbors_configured = false;
1190 link->static_routes_configured = false;
1191 link->routing_policy_rules_configured = false;
1192
1193 r = link_set_bridge_fdb(link);
1194 if (r < 0)
1195 return r;
1196
1197 r = link_request_set_neighbors(link);
1198 if (r < 0)
1199 return r;
1200
1201 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1202 bool update;
1203
1204 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1205
1206 r = address_configure(ad, link, address_handler, update);
1207 if (r < 0) {
1208 log_link_warning_errno(link, r, "Could not set addresses: %m");
1209 link_enter_failed(link);
1210 return r;
1211 }
1212
1213 link->address_messages++;
1214 }
1215
1216 LIST_FOREACH(labels, label, link->network->address_labels) {
1217 r = address_label_configure(label, link, NULL, false);
1218 if (r < 0) {
1219 log_link_warning_errno(link, r, "Could not set address label: %m");
1220 link_enter_failed(link);
1221 return r;
1222 }
1223
1224 link->address_label_messages++;
1225 }
1226
1227 /* now that we can figure out a default address for the dhcp server,
1228 start it */
1229 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1230 Address *address;
1231 Link *uplink = NULL;
1232 bool acquired_uplink = false;
1233
1234 address = link_find_dhcp_server_address(link);
1235 if (!address) {
1236 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1237 link_enter_failed(link);
1238 return 0;
1239 }
1240
1241 /* use the server address' subnet as the pool */
1242 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1243 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1244 if (r < 0)
1245 return r;
1246
1247 /* TODO:
1248 r = sd_dhcp_server_set_router(link->dhcp_server,
1249 &main_address->in_addr.in);
1250 if (r < 0)
1251 return r;
1252 */
1253
1254 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1255 r = sd_dhcp_server_set_max_lease_time(
1256 link->dhcp_server,
1257 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1258 if (r < 0)
1259 return r;
1260 }
1261
1262 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1263 r = sd_dhcp_server_set_default_lease_time(
1264 link->dhcp_server,
1265 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1266 if (r < 0)
1267 return r;
1268 }
1269
1270 if (link->network->dhcp_server_emit_dns) {
1271
1272 if (link->network->n_dhcp_server_dns > 0)
1273 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1274 else {
1275 uplink = manager_find_uplink(link->manager, link);
1276 acquired_uplink = true;
1277
1278 if (!uplink) {
1279 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1280 r = 0;
1281 } else
1282 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1283 }
1284 if (r < 0)
1285 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1286 }
1287
1288 if (link->network->dhcp_server_emit_ntp) {
1289
1290 if (link->network->n_dhcp_server_ntp > 0)
1291 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1292 else {
1293 if (!acquired_uplink)
1294 uplink = manager_find_uplink(link->manager, link);
1295
1296 if (!uplink) {
1297 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1298 r = 0;
1299 } else
1300 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1301
1302 }
1303 if (r < 0)
1304 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1305 }
1306
1307 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1308 if (r < 0)
1309 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1310
1311 if (link->network->dhcp_server_emit_timezone) {
1312 _cleanup_free_ char *buffer = NULL;
1313 const char *tz = NULL;
1314
1315 if (link->network->dhcp_server_timezone)
1316 tz = link->network->dhcp_server_timezone;
1317 else {
1318 r = get_timezone(&buffer);
1319 if (r < 0)
1320 log_warning_errno(r, "Failed to determine timezone: %m");
1321 else
1322 tz = buffer;
1323 }
1324
1325 if (tz) {
1326 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1327 if (r < 0)
1328 return r;
1329 }
1330 }
1331 if (!sd_dhcp_server_is_running(link->dhcp_server)) {
1332 r = sd_dhcp_server_start(link->dhcp_server);
1333 if (r < 0) {
1334 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1335
1336 link_enter_failed(link);
1337
1338 return 0;
1339 }
1340 }
1341
1342 log_link_debug(link, "Offering DHCPv4 leases");
1343 }
1344
1345 if (link->address_messages == 0) {
1346 link->addresses_configured = true;
1347 link_check_ready(link);
1348 } else
1349 log_link_debug(link, "Setting addresses");
1350
1351 return 0;
1352 }
1353
1354 static int link_set_bridge_vlan(Link *link) {
1355 int r = 0;
1356
1357 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1358 if (r < 0)
1359 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1360
1361 return r;
1362 }
1363
1364 static int link_set_proxy_arp(Link *link) {
1365 int r;
1366
1367 if (!link_proxy_arp_enabled(link))
1368 return 0;
1369
1370 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1371 if (r < 0)
1372 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1373
1374 return 0;
1375 }
1376
1377 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1378 int r;
1379
1380 assert(link);
1381
1382 log_link_debug(link, "Set link");
1383
1384 r = sd_netlink_message_get_errno(m);
1385 if (r < 0 && r != -EEXIST) {
1386 log_link_error_errno(link, r, "Could not join netdev: %m");
1387 link_enter_failed(link);
1388 }
1389
1390 return 1;
1391 }
1392
1393 static int link_configure_after_setting_mtu(Link *link);
1394
1395 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1396 int r;
1397
1398 assert(m);
1399 assert(link);
1400 assert(link->ifname);
1401
1402 link->setting_mtu = false;
1403
1404 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1405 return 1;
1406
1407 r = sd_netlink_message_get_errno(m);
1408 if (r < 0) {
1409 log_link_warning_errno(link, r, "Could not set MTU: %m");
1410 return 1;
1411 }
1412
1413 log_link_debug(link, "Setting MTU done.");
1414
1415 if (link->state == LINK_STATE_INITIALIZED)
1416 (void) link_configure_after_setting_mtu(link);
1417
1418 return 1;
1419 }
1420
1421 int link_set_mtu(Link *link, uint32_t mtu, bool force) {
1422 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1423 int r;
1424
1425 assert(link);
1426 assert(link->manager);
1427 assert(link->manager->rtnl);
1428
1429 if (mtu == 0 || link->setting_mtu)
1430 return 0;
1431
1432 if (force ? link->mtu == mtu : link->mtu >= mtu)
1433 return 0;
1434
1435 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1436
1437 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1438 if (r < 0)
1439 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1440
1441 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1442 * for this interface, then disable IPv6 else enable it. */
1443 (void) link_enable_ipv6(link);
1444
1445 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1446 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1447 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1448
1449 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1450 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1451
1452 mtu = IPV6_MIN_MTU;
1453 }
1454
1455 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1456 if (r < 0)
1457 return log_link_error_errno(link, r, "Could not append MTU: %m");
1458
1459 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1460 link_netlink_destroy_callback, link);
1461 if (r < 0)
1462 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1463
1464 link_ref(link);
1465 link->setting_mtu = true;
1466
1467 return 0;
1468 }
1469
1470 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1471 int r;
1472
1473 assert(m);
1474 assert(link);
1475 assert(link->ifname);
1476
1477 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1478 return 1;
1479
1480 r = sd_netlink_message_get_errno(m);
1481 if (r < 0)
1482 log_link_warning_errno(link, r, "Could not set link flags: %m");
1483
1484 return 1;
1485 }
1486
1487 static int link_set_flags(Link *link) {
1488 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1489 unsigned ifi_change = 0;
1490 unsigned ifi_flags = 0;
1491 int r;
1492
1493 assert(link);
1494 assert(link->manager);
1495 assert(link->manager->rtnl);
1496
1497 if (link->flags & IFF_LOOPBACK)
1498 return 0;
1499
1500 if (!link->network)
1501 return 0;
1502
1503 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1504 return 0;
1505
1506 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1507 if (r < 0)
1508 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1509
1510 if (link->network->arp >= 0) {
1511 ifi_change |= IFF_NOARP;
1512 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1513 }
1514
1515 if (link->network->multicast >= 0) {
1516 ifi_change |= IFF_MULTICAST;
1517 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1518 }
1519
1520 if (link->network->allmulticast >= 0) {
1521 ifi_change |= IFF_ALLMULTI;
1522 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1523 }
1524
1525 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1526 if (r < 0)
1527 return log_link_error_errno(link, r, "Could not set link flags: %m");
1528
1529 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1530 link_netlink_destroy_callback, link);
1531 if (r < 0)
1532 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1533
1534 link_ref(link);
1535
1536 return 0;
1537 }
1538
1539 static int link_set_bridge(Link *link) {
1540 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1541 int r;
1542
1543 assert(link);
1544 assert(link->network);
1545
1546 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1547 if (r < 0)
1548 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1549
1550 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1551 if (r < 0)
1552 return log_link_error_errno(link, r, "Could not set message family: %m");
1553
1554 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1555 if (r < 0)
1556 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1557
1558 if (link->network->use_bpdu >= 0) {
1559 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
1560 if (r < 0)
1561 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1562 }
1563
1564 if (link->network->hairpin >= 0) {
1565 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1566 if (r < 0)
1567 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1568 }
1569
1570 if (link->network->fast_leave >= 0) {
1571 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1572 if (r < 0)
1573 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1574 }
1575
1576 if (link->network->allow_port_to_be_root >= 0) {
1577 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
1578 if (r < 0)
1579 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1580 }
1581
1582 if (link->network->unicast_flood >= 0) {
1583 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1584 if (r < 0)
1585 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1586 }
1587
1588 if (link->network->multicast_flood >= 0) {
1589 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_FLOOD, link->network->multicast_flood);
1590 if (r < 0)
1591 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_FLOOD attribute: %m");
1592 }
1593
1594 if (link->network->multicast_to_unicast >= 0) {
1595 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_TO_UCAST, link->network->multicast_to_unicast);
1596 if (r < 0)
1597 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_TO_UCAST attribute: %m");
1598 }
1599
1600 if (link->network->neighbor_suppression >= 0) {
1601 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_NEIGH_SUPPRESS, link->network->neighbor_suppression);
1602 if (r < 0)
1603 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_NEIGH_SUPPRESS attribute: %m");
1604 }
1605
1606 if (link->network->learning >= 0) {
1607 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_LEARNING, link->network->learning);
1608 if (r < 0)
1609 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_LEARNING attribute: %m");
1610 }
1611
1612 if (link->network->bridge_proxy_arp >= 0) {
1613 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROXYARP, link->network->bridge_proxy_arp);
1614 if (r < 0)
1615 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROXYARP attribute: %m");
1616 }
1617
1618 if (link->network->bridge_proxy_arp_wifi >= 0) {
1619 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROXYARP_WIFI, link->network->bridge_proxy_arp_wifi);
1620 if (r < 0)
1621 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROXYARP_WIFI attribute: %m");
1622 }
1623
1624 if (link->network->cost != 0) {
1625 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1626 if (r < 0)
1627 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1628 }
1629
1630 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1631 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1632 if (r < 0)
1633 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1634 }
1635
1636 if (link->network->multicast_router != _MULTICAST_ROUTER_INVALID) {
1637 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MULTICAST_ROUTER, link->network->multicast_router);
1638 if (r < 0)
1639 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MULTICAST_ROUTER attribute: %m");
1640 }
1641
1642 r = sd_netlink_message_close_container(req);
1643 if (r < 0)
1644 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1645
1646 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_handler,
1647 link_netlink_destroy_callback, link);
1648 if (r < 0)
1649 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1650
1651 link_ref(link);
1652
1653 return r;
1654 }
1655
1656 static int link_set_bond_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1657 int r;
1658
1659 assert(m);
1660 assert(link);
1661 assert(link->ifname);
1662
1663 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1664 return 1;
1665
1666 r = sd_netlink_message_get_errno(m);
1667 if (r < 0) {
1668 log_link_warning_errno(link, r, "Could not set bonding interface: %m");
1669 return 1;
1670 }
1671
1672 return 1;
1673 }
1674
1675 static int link_set_bond(Link *link) {
1676 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1677 int r;
1678
1679 assert(link);
1680 assert(link->network);
1681
1682 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1683 if (r < 0)
1684 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1685
1686 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1687 if (r < 0)
1688 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1689
1690 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1691 if (r < 0)
1692 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1693
1694 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1695 if (r < 0)
1696 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1697
1698 if (link->network->active_slave) {
1699 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1700 if (r < 0)
1701 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1702 }
1703
1704 if (link->network->primary_slave) {
1705 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1706 if (r < 0)
1707 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1708 }
1709
1710 r = sd_netlink_message_close_container(req);
1711 if (r < 0)
1712 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1713
1714 r = sd_netlink_message_close_container(req);
1715 if (r < 0)
1716 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1717
1718 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_bond_handler,
1719 link_netlink_destroy_callback, link);
1720 if (r < 0)
1721 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1722
1723 link_ref(link);
1724
1725 return r;
1726 }
1727
1728 static int link_lldp_save(Link *link) {
1729 _cleanup_free_ char *temp_path = NULL;
1730 _cleanup_fclose_ FILE *f = NULL;
1731 sd_lldp_neighbor **l = NULL;
1732 int n = 0, r, i;
1733
1734 assert(link);
1735 assert(link->lldp_file);
1736
1737 if (!link->lldp) {
1738 (void) unlink(link->lldp_file);
1739 return 0;
1740 }
1741
1742 r = sd_lldp_get_neighbors(link->lldp, &l);
1743 if (r < 0)
1744 goto finish;
1745 if (r == 0) {
1746 (void) unlink(link->lldp_file);
1747 goto finish;
1748 }
1749
1750 n = r;
1751
1752 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1753 if (r < 0)
1754 goto finish;
1755
1756 fchmod(fileno(f), 0644);
1757
1758 for (i = 0; i < n; i++) {
1759 const void *p;
1760 le64_t u;
1761 size_t sz;
1762
1763 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1764 if (r < 0)
1765 goto finish;
1766
1767 u = htole64(sz);
1768 (void) fwrite(&u, 1, sizeof(u), f);
1769 (void) fwrite(p, 1, sz, f);
1770 }
1771
1772 r = fflush_and_check(f);
1773 if (r < 0)
1774 goto finish;
1775
1776 if (rename(temp_path, link->lldp_file) < 0) {
1777 r = -errno;
1778 goto finish;
1779 }
1780
1781 finish:
1782 if (r < 0) {
1783 (void) unlink(link->lldp_file);
1784 if (temp_path)
1785 (void) unlink(temp_path);
1786
1787 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1788 }
1789
1790 if (l) {
1791 for (i = 0; i < n; i++)
1792 sd_lldp_neighbor_unref(l[i]);
1793 free(l);
1794 }
1795
1796 return r;
1797 }
1798
1799 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1800 Link *link = userdata;
1801 int r;
1802
1803 assert(link);
1804
1805 (void) link_lldp_save(link);
1806
1807 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1808 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1809
1810 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1811
1812 r = link_lldp_emit_start(link);
1813 if (r < 0)
1814 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1815 }
1816 }
1817
1818 static int link_acquire_ipv6_conf(Link *link) {
1819 int r;
1820
1821 assert(link);
1822
1823 if (link_ipv6_accept_ra_enabled(link)) {
1824 assert(link->ndisc);
1825
1826 log_link_debug(link, "Discovering IPv6 routers");
1827
1828 r = sd_ndisc_start(link->ndisc);
1829 if (r < 0 && r != -EBUSY)
1830 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1831 }
1832
1833 if (link_radv_enabled(link)) {
1834 assert(link->radv);
1835 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1836
1837 log_link_debug(link, "Starting IPv6 Router Advertisements");
1838
1839 r = sd_radv_start(link->radv);
1840 if (r < 0 && r != -EBUSY)
1841 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1842 }
1843
1844 (void) dhcp6_request_prefix_delegation(link);
1845
1846 return 0;
1847 }
1848
1849 static int link_acquire_ipv4_conf(Link *link) {
1850 int r;
1851
1852 assert(link);
1853 assert(link->manager);
1854 assert(link->manager->event);
1855
1856 if (link_ipv4ll_enabled(link)) {
1857 assert(link->ipv4ll);
1858
1859 log_link_debug(link, "Acquiring IPv4 link-local address");
1860
1861 r = sd_ipv4ll_start(link->ipv4ll);
1862 if (r < 0)
1863 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1864 }
1865
1866 if (link_dhcp4_enabled(link)) {
1867 assert(link->dhcp_client);
1868
1869 log_link_debug(link, "Acquiring DHCPv4 lease");
1870
1871 r = sd_dhcp_client_start(link->dhcp_client);
1872 if (r < 0)
1873 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1874 }
1875
1876 return 0;
1877 }
1878
1879 static int link_acquire_conf(Link *link) {
1880 int r;
1881
1882 assert(link);
1883
1884 r = link_acquire_ipv4_conf(link);
1885 if (r < 0)
1886 return r;
1887
1888 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1889 r = link_acquire_ipv6_conf(link);
1890 if (r < 0)
1891 return r;
1892 }
1893
1894 if (link_lldp_emit_enabled(link)) {
1895 r = link_lldp_emit_start(link);
1896 if (r < 0)
1897 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1898 }
1899
1900 return 0;
1901 }
1902
1903 bool link_has_carrier(Link *link) {
1904 /* see Documentation/networking/operstates.txt in the kernel sources */
1905
1906 if (link->kernel_operstate == IF_OPER_UP)
1907 return true;
1908
1909 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1910 /* operstate may not be implemented, so fall back to flags */
1911 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1912 return true;
1913
1914 return false;
1915 }
1916
1917 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1918 int r;
1919
1920 assert(link);
1921
1922 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1923 return 1;
1924
1925 r = sd_netlink_message_get_errno(m);
1926 if (r < 0)
1927 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1928
1929 return 1;
1930 }
1931
1932 static int link_configure_addrgen_mode(Link *link) {
1933 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1934 uint8_t ipv6ll_mode;
1935 int r;
1936
1937 assert(link);
1938 assert(link->network);
1939 assert(link->manager);
1940 assert(link->manager->rtnl);
1941
1942 log_link_debug(link, "Setting address genmode for link");
1943
1944 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1945 if (r < 0)
1946 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1947
1948 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1949 if (r < 0)
1950 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1951
1952 r = sd_netlink_message_open_container(req, AF_INET6);
1953 if (r < 0)
1954 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1955
1956 if (!link_ipv6ll_enabled(link))
1957 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1958 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1959 /* The file may not exist. And event if it exists, when stable_secret is unset,
1960 * reading the file fails with EIO. */
1961 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1962 else
1963 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1964
1965 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1966 if (r < 0)
1967 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1968
1969 r = sd_netlink_message_close_container(req);
1970 if (r < 0)
1971 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1972
1973 r = sd_netlink_message_close_container(req);
1974 if (r < 0)
1975 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1976
1977 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1978 link_netlink_destroy_callback, link);
1979 if (r < 0)
1980 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1981
1982 link_ref(link);
1983
1984 return 0;
1985 }
1986
1987 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1988 int r;
1989
1990 assert(link);
1991
1992 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1993 return 1;
1994
1995 r = sd_netlink_message_get_errno(m);
1996 if (r < 0)
1997 /* we warn but don't fail the link, as it may be brought up later */
1998 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1999
2000 return 1;
2001 }
2002
2003 static int link_up(Link *link) {
2004 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2005 int r;
2006
2007 assert(link);
2008 assert(link->network);
2009 assert(link->manager);
2010 assert(link->manager->rtnl);
2011
2012 log_link_debug(link, "Bringing link up");
2013
2014 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2015 if (r < 0)
2016 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2017
2018 /* set it free if not enslaved with networkd */
2019 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
2020 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
2021 if (r < 0)
2022 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
2023 }
2024
2025 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
2026 if (r < 0)
2027 return log_link_error_errno(link, r, "Could not set link flags: %m");
2028
2029 if (link->network->mac) {
2030 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
2031 if (r < 0)
2032 return log_link_error_errno(link, r, "Could not set MAC address: %m");
2033 }
2034
2035 if (link_ipv6_enabled(link)) {
2036 uint8_t ipv6ll_mode;
2037
2038 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
2039 if (r < 0)
2040 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
2041
2042 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
2043 r = sd_netlink_message_open_container(req, AF_INET6);
2044 if (r < 0)
2045 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
2046
2047 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
2048 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
2049 if (r < 0)
2050 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
2051 }
2052
2053 if (!link_ipv6ll_enabled(link))
2054 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
2055 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
2056 /* The file may not exist. And event if it exists, when stable_secret is unset,
2057 * reading the file fails with EIO. */
2058 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
2059 else
2060 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
2061
2062 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
2063 if (r < 0)
2064 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
2065
2066 r = sd_netlink_message_close_container(req);
2067 if (r < 0)
2068 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
2069
2070 r = sd_netlink_message_close_container(req);
2071 if (r < 0)
2072 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
2073 }
2074
2075 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2076 link_netlink_destroy_callback, link);
2077 if (r < 0)
2078 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2079
2080 link_ref(link);
2081
2082 return 0;
2083 }
2084
2085 static int link_up_can(Link *link) {
2086 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2087 int r;
2088
2089 assert(link);
2090
2091 log_link_debug(link, "Bringing CAN link up");
2092
2093 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2094 if (r < 0)
2095 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2096
2097 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
2098 if (r < 0)
2099 return log_link_error_errno(link, r, "Could not set link flags: %m");
2100
2101 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2102 link_netlink_destroy_callback, link);
2103 if (r < 0)
2104 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2105
2106 link_ref(link);
2107
2108 return 0;
2109 }
2110
2111 static int link_set_can(Link *link) {
2112 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
2113 int r;
2114
2115 assert(link);
2116 assert(link->network);
2117 assert(link->manager);
2118 assert(link->manager->rtnl);
2119
2120 log_link_debug(link, "link_set_can");
2121
2122 r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
2123 if (r < 0)
2124 return log_link_error_errno(link, r, "Failed to allocate netlink message: %m");
2125
2126 r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
2127 if (r < 0)
2128 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
2129
2130 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
2131 if (r < 0)
2132 return log_link_error_errno(link, r, "Failed to open netlink container: %m");
2133
2134 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
2135 if (r < 0)
2136 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
2137
2138 if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) {
2139 struct can_bittiming bt = {
2140 .bitrate = link->network->can_bitrate,
2141 .sample_point = link->network->can_sample_point,
2142 };
2143
2144 if (link->network->can_bitrate > UINT32_MAX) {
2145 log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate);
2146 return -ERANGE;
2147 }
2148
2149 log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate);
2150 if (link->network->can_sample_point > 0)
2151 log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
2152 else
2153 log_link_debug(link, "Using default sample point");
2154
2155 r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
2156 if (r < 0)
2157 return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
2158 }
2159
2160 if (link->network->can_restart_us > 0) {
2161 char time_string[FORMAT_TIMESPAN_MAX];
2162 uint64_t restart_ms;
2163
2164 if (link->network->can_restart_us == USEC_INFINITY)
2165 restart_ms = 0;
2166 else
2167 restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC);
2168
2169 format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC);
2170
2171 if (restart_ms > UINT32_MAX) {
2172 log_link_error(link, "restart timeout (%s) too big.", time_string);
2173 return -ERANGE;
2174 }
2175
2176 log_link_debug(link, "Setting restart = %s", time_string);
2177
2178 r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
2179 if (r < 0)
2180 return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
2181 }
2182
2183 if (link->network->can_triple_sampling >= 0) {
2184 struct can_ctrlmode cm = {
2185 .mask = CAN_CTRLMODE_3_SAMPLES,
2186 .flags = link->network->can_triple_sampling ? CAN_CTRLMODE_3_SAMPLES : 0,
2187 };
2188
2189 log_link_debug(link, "%sabling triple-sampling", link->network->can_triple_sampling ? "En" : "Dis");
2190
2191 r = sd_netlink_message_append_data(m, IFLA_CAN_CTRLMODE, &cm, sizeof(cm));
2192 if (r < 0)
2193 return log_link_error_errno(link, r, "Could not append IFLA_CAN_CTRLMODE attribute: %m");
2194 }
2195
2196 r = sd_netlink_message_close_container(m);
2197 if (r < 0)
2198 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2199
2200 r = sd_netlink_message_close_container(m);
2201 if (r < 0)
2202 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2203
2204 r = netlink_call_async(link->manager->rtnl, NULL, m, link_set_handler,
2205 link_netlink_destroy_callback, link);
2206 if (r < 0)
2207 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2208
2209 link_ref(link);
2210
2211 if (!(link->flags & IFF_UP)) {
2212 r = link_up_can(link);
2213 if (r < 0) {
2214 link_enter_failed(link);
2215 return r;
2216 }
2217 }
2218
2219 log_link_debug(link, "link_set_can done");
2220
2221 return r;
2222 }
2223
2224 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2225 int r;
2226
2227 assert(link);
2228
2229 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2230 return 1;
2231
2232 r = sd_netlink_message_get_errno(m);
2233 if (r < 0)
2234 log_link_warning_errno(link, r, "Could not bring down interface: %m");
2235
2236 if (streq_ptr(link->kind, "can"))
2237 link_set_can(link);
2238
2239 return 1;
2240 }
2241
2242 int link_down(Link *link) {
2243 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2244 int r;
2245
2246 assert(link);
2247 assert(link->manager);
2248 assert(link->manager->rtnl);
2249
2250 log_link_debug(link, "Bringing link down");
2251
2252 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
2253 RTM_SETLINK, link->ifindex);
2254 if (r < 0)
2255 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2256
2257 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
2258 if (r < 0)
2259 return log_link_error_errno(link, r, "Could not set link flags: %m");
2260
2261 r = netlink_call_async(link->manager->rtnl, NULL, req, link_down_handler,
2262 link_netlink_destroy_callback, link);
2263 if (r < 0)
2264 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2265
2266 link_ref(link);
2267
2268 return 0;
2269 }
2270
2271 static int link_handle_bound_to_list(Link *link) {
2272 Link *l;
2273 Iterator i;
2274 int r;
2275 bool required_up = false;
2276 bool link_is_up = false;
2277
2278 assert(link);
2279
2280 if (hashmap_isempty(link->bound_to_links))
2281 return 0;
2282
2283 if (link->flags & IFF_UP)
2284 link_is_up = true;
2285
2286 HASHMAP_FOREACH (l, link->bound_to_links, i)
2287 if (link_has_carrier(l)) {
2288 required_up = true;
2289 break;
2290 }
2291
2292 if (!required_up && link_is_up) {
2293 r = link_down(link);
2294 if (r < 0)
2295 return r;
2296 } else if (required_up && !link_is_up) {
2297 r = link_up(link);
2298 if (r < 0)
2299 return r;
2300 }
2301
2302 return 0;
2303 }
2304
2305 static int link_handle_bound_by_list(Link *link) {
2306 Iterator i;
2307 Link *l;
2308 int r;
2309
2310 assert(link);
2311
2312 if (hashmap_isempty(link->bound_by_links))
2313 return 0;
2314
2315 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2316 r = link_handle_bound_to_list(l);
2317 if (r < 0)
2318 return r;
2319 }
2320
2321 return 0;
2322 }
2323
2324 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2325 int r;
2326
2327 assert(link);
2328 assert(carrier);
2329
2330 if (link == carrier)
2331 return 0;
2332
2333 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2334 return 0;
2335
2336 r = hashmap_ensure_allocated(h, NULL);
2337 if (r < 0)
2338 return r;
2339
2340 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2341 if (r < 0)
2342 return r;
2343
2344 return 0;
2345 }
2346
2347 static int link_new_bound_by_list(Link *link) {
2348 Manager *m;
2349 Link *carrier;
2350 Iterator i;
2351 int r;
2352 bool list_updated = false;
2353
2354 assert(link);
2355 assert(link->manager);
2356
2357 m = link->manager;
2358
2359 HASHMAP_FOREACH(carrier, m->links, i) {
2360 if (!carrier->network)
2361 continue;
2362
2363 if (strv_isempty(carrier->network->bind_carrier))
2364 continue;
2365
2366 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2367 r = link_put_carrier(link, carrier, &link->bound_by_links);
2368 if (r < 0)
2369 return r;
2370
2371 list_updated = true;
2372 }
2373 }
2374
2375 if (list_updated)
2376 link_dirty(link);
2377
2378 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2379 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2380 if (r < 0)
2381 return r;
2382
2383 link_dirty(carrier);
2384 }
2385
2386 return 0;
2387 }
2388
2389 static int link_new_bound_to_list(Link *link) {
2390 Manager *m;
2391 Link *carrier;
2392 Iterator i;
2393 int r;
2394 bool list_updated = false;
2395
2396 assert(link);
2397 assert(link->manager);
2398
2399 if (!link->network)
2400 return 0;
2401
2402 if (strv_isempty(link->network->bind_carrier))
2403 return 0;
2404
2405 m = link->manager;
2406
2407 HASHMAP_FOREACH (carrier, m->links, i) {
2408 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2409 r = link_put_carrier(link, carrier, &link->bound_to_links);
2410 if (r < 0)
2411 return r;
2412
2413 list_updated = true;
2414 }
2415 }
2416
2417 if (list_updated)
2418 link_dirty(link);
2419
2420 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2421 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2422 if (r < 0)
2423 return r;
2424
2425 link_dirty(carrier);
2426 }
2427
2428 return 0;
2429 }
2430
2431 static int link_new_carrier_maps(Link *link) {
2432 int r;
2433
2434 r = link_new_bound_by_list(link);
2435 if (r < 0)
2436 return r;
2437
2438 r = link_handle_bound_by_list(link);
2439 if (r < 0)
2440 return r;
2441
2442 r = link_new_bound_to_list(link);
2443 if (r < 0)
2444 return r;
2445
2446 r = link_handle_bound_to_list(link);
2447 if (r < 0)
2448 return r;
2449
2450 return 0;
2451 }
2452
2453 static void link_free_bound_to_list(Link *link) {
2454 Link *bound_to;
2455 Iterator i;
2456
2457 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2458 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2459
2460 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2461 link_dirty(bound_to);
2462 }
2463
2464 return;
2465 }
2466
2467 static void link_free_bound_by_list(Link *link) {
2468 Link *bound_by;
2469 Iterator i;
2470
2471 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2472 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2473
2474 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2475 link_dirty(bound_by);
2476 link_handle_bound_to_list(bound_by);
2477 }
2478 }
2479
2480 return;
2481 }
2482
2483 static void link_free_carrier_maps(Link *link) {
2484 bool list_updated = false;
2485
2486 assert(link);
2487
2488 if (!hashmap_isempty(link->bound_to_links)) {
2489 link_free_bound_to_list(link);
2490 list_updated = true;
2491 }
2492
2493 if (!hashmap_isempty(link->bound_by_links)) {
2494 link_free_bound_by_list(link);
2495 list_updated = true;
2496 }
2497
2498 if (list_updated)
2499 link_dirty(link);
2500
2501 return;
2502 }
2503
2504 static int link_append_to_master(Link *link, NetDev *netdev) {
2505 Link *master;
2506 int r;
2507
2508 assert(link);
2509 assert(netdev);
2510
2511 r = link_get(link->manager, netdev->ifindex, &master);
2512 if (r < 0)
2513 return r;
2514
2515 r = set_ensure_allocated(&master->slaves, NULL);
2516 if (r < 0)
2517 return r;
2518
2519 r = set_put(master->slaves, link);
2520 if (r < 0)
2521 return r;
2522
2523 link_ref(link);
2524 return 0;
2525 }
2526
2527 static void link_drop_from_master(Link *link, NetDev *netdev) {
2528 Link *master;
2529
2530 assert(link);
2531
2532 if (!link->manager || !netdev)
2533 return;
2534
2535 if (link_get(link->manager, netdev->ifindex, &master) < 0)
2536 return;
2537
2538 link_unref(set_remove(master->slaves, link));
2539 }
2540
2541 static void link_detach_from_manager(Link *link) {
2542 if (!link || !link->manager)
2543 return;
2544
2545 link_unref(set_remove(link->manager->links_requesting_uuid, link));
2546 link_clean(link);
2547
2548 /* The following must be called at last. */
2549 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2550 link_unref(link);
2551 }
2552
2553 void link_drop(Link *link) {
2554 if (!link || link->state == LINK_STATE_LINGER)
2555 return;
2556
2557 link_set_state(link, LINK_STATE_LINGER);
2558
2559 link_free_carrier_maps(link);
2560
2561 if (link->network) {
2562 link_drop_from_master(link, link->network->bridge);
2563 link_drop_from_master(link, link->network->bond);
2564 }
2565
2566 log_link_debug(link, "Link removed");
2567
2568 (void) unlink(link->state_file);
2569 link_detach_from_manager(link);
2570 }
2571
2572 static int link_joined(Link *link) {
2573 int r;
2574
2575 assert(link);
2576 assert(link->network);
2577
2578 if (!hashmap_isempty(link->bound_to_links)) {
2579 r = link_handle_bound_to_list(link);
2580 if (r < 0)
2581 return r;
2582 } else if (!(link->flags & IFF_UP)) {
2583 r = link_up(link);
2584 if (r < 0) {
2585 link_enter_failed(link);
2586 return r;
2587 }
2588 }
2589
2590 if (link->network->bridge) {
2591 r = link_set_bridge(link);
2592 if (r < 0)
2593 log_link_error_errno(link, r, "Could not set bridge message: %m");
2594
2595 r = link_append_to_master(link, link->network->bridge);
2596 if (r < 0)
2597 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2598 }
2599
2600 if (link->network->bond) {
2601 r = link_set_bond(link);
2602 if (r < 0)
2603 log_link_error_errno(link, r, "Could not set bond message: %m");
2604
2605 r = link_append_to_master(link, link->network->bond);
2606 if (r < 0)
2607 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2608 }
2609
2610 if (link->network->use_br_vlan &&
2611 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2612 r = link_set_bridge_vlan(link);
2613 if (r < 0)
2614 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2615 }
2616
2617 /* Skip setting up addresses until it gets carrier,
2618 or it would try to set addresses twice,
2619 which is bad for non-idempotent steps. */
2620 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2621 return 0;
2622
2623 return link_request_set_addresses(link);
2624 }
2625
2626 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2627 int r;
2628
2629 assert(link);
2630 assert(link->network);
2631 assert(link->enslaving > 0);
2632 assert(!link->enslaved_raw);
2633
2634 link->enslaving--;
2635
2636 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2637 return 1;
2638
2639 r = sd_netlink_message_get_errno(m);
2640 if (r < 0 && r != -EEXIST) {
2641 log_link_error_errno(link, r, "Could not join netdev: %m");
2642 link_enter_failed(link);
2643 return 1;
2644 } else
2645 log_link_debug(link, "Joined netdev");
2646
2647 if (link->enslaving == 0) {
2648 link->enslaved_raw = true;
2649 link_joined(link);
2650 }
2651
2652 return 1;
2653 }
2654
2655 static int link_enter_join_netdev(Link *link) {
2656 NetDev *netdev;
2657 Iterator i;
2658 int r;
2659
2660 assert(link);
2661 assert(link->network);
2662 assert(link->state == LINK_STATE_INITIALIZED);
2663
2664 link_set_state(link, LINK_STATE_CONFIGURING);
2665
2666 link_dirty(link);
2667 link->enslaving = 0;
2668 link->enslaved_raw = false;
2669
2670 if (link->network->bond) {
2671 if (link->network->bond->state == NETDEV_STATE_READY &&
2672 link->network->bond->ifindex == link->master_ifindex)
2673 return link_joined(link);
2674
2675 log_struct(LOG_DEBUG,
2676 LOG_LINK_INTERFACE(link),
2677 LOG_NETDEV_INTERFACE(link->network->bond),
2678 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2679
2680 link->enslaving++;
2681
2682 r = netdev_join(link->network->bond, link, netdev_join_handler);
2683 if (r < 0) {
2684 log_struct_errno(LOG_WARNING, r,
2685 LOG_LINK_INTERFACE(link),
2686 LOG_NETDEV_INTERFACE(link->network->bond),
2687 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2688 link_enter_failed(link);
2689 return r;
2690 }
2691 }
2692
2693 if (link->network->bridge) {
2694 log_struct(LOG_DEBUG,
2695 LOG_LINK_INTERFACE(link),
2696 LOG_NETDEV_INTERFACE(link->network->bridge),
2697 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2698
2699 link->enslaving++;
2700
2701 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2702 if (r < 0) {
2703 log_struct_errno(LOG_WARNING, r,
2704 LOG_LINK_INTERFACE(link),
2705 LOG_NETDEV_INTERFACE(link->network->bridge),
2706 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2707 link_enter_failed(link);
2708 return r;
2709 }
2710 }
2711
2712 if (link->network->vrf) {
2713 log_struct(LOG_DEBUG,
2714 LOG_LINK_INTERFACE(link),
2715 LOG_NETDEV_INTERFACE(link->network->vrf),
2716 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2717
2718 link->enslaving++;
2719
2720 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2721 if (r < 0) {
2722 log_struct_errno(LOG_WARNING, r,
2723 LOG_LINK_INTERFACE(link),
2724 LOG_NETDEV_INTERFACE(link->network->vrf),
2725 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2726 link_enter_failed(link);
2727 return r;
2728 }
2729 }
2730
2731 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2732
2733 if (netdev->ifindex > 0)
2734 /* Assume already enslaved. */
2735 continue;
2736
2737 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2738 continue;
2739
2740 log_struct(LOG_DEBUG,
2741 LOG_LINK_INTERFACE(link),
2742 LOG_NETDEV_INTERFACE(netdev),
2743 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2744
2745 link->enslaving++;
2746
2747 r = netdev_join(netdev, link, netdev_join_handler);
2748 if (r < 0) {
2749 log_struct_errno(LOG_WARNING, r,
2750 LOG_LINK_INTERFACE(link),
2751 LOG_NETDEV_INTERFACE(netdev),
2752 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2753 link_enter_failed(link);
2754 return r;
2755 }
2756 }
2757
2758 if (link->enslaving == 0)
2759 return link_joined(link);
2760
2761 return 0;
2762 }
2763
2764 static int link_set_ipv4_forward(Link *link) {
2765 int r;
2766
2767 if (!link_ipv4_forward_enabled(link))
2768 return 0;
2769
2770 /* We propagate the forwarding flag from one interface to the
2771 * global setting one way. This means: as long as at least one
2772 * interface was configured at any time that had IP forwarding
2773 * enabled the setting will stay on for good. We do this
2774 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2775 * somewhat in sync (see below). */
2776
2777 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2778 if (r < 0)
2779 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2780
2781 return 0;
2782 }
2783
2784 static int link_set_ipv6_forward(Link *link) {
2785 int r;
2786
2787 if (!link_ipv6_forward_enabled(link))
2788 return 0;
2789
2790 /* On Linux, the IPv6 stack does not know a per-interface
2791 * packet forwarding setting: either packet forwarding is on
2792 * for all, or off for all. We hence don't bother with a
2793 * per-interface setting, but simply propagate the interface
2794 * flag, if it is set, to the global flag, one-way. Note that
2795 * while IPv4 would allow a per-interface flag, we expose the
2796 * same behaviour there and also propagate the setting from
2797 * one to all, to keep things simple (see above). */
2798
2799 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2800 if (r < 0)
2801 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2802
2803 return 0;
2804 }
2805
2806 static int link_set_ipv6_privacy_extensions(Link *link) {
2807 IPv6PrivacyExtensions s;
2808 int r;
2809
2810 s = link_ipv6_privacy_extensions(link);
2811 if (s < 0)
2812 return 0;
2813
2814 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2815 if (r < 0)
2816 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2817
2818 return 0;
2819 }
2820
2821 static int link_set_ipv6_accept_ra(Link *link) {
2822 int r;
2823
2824 /* Make this a NOP if IPv6 is not available */
2825 if (!socket_ipv6_is_supported())
2826 return 0;
2827
2828 if (link->flags & IFF_LOOPBACK)
2829 return 0;
2830
2831 if (!link->network)
2832 return 0;
2833
2834 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2835 if (r < 0)
2836 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2837
2838 return 0;
2839 }
2840
2841 static int link_set_ipv6_dad_transmits(Link *link) {
2842 int r;
2843
2844 /* Make this a NOP if IPv6 is not available */
2845 if (!socket_ipv6_is_supported())
2846 return 0;
2847
2848 if (link->flags & IFF_LOOPBACK)
2849 return 0;
2850
2851 if (!link->network)
2852 return 0;
2853
2854 if (link->network->ipv6_dad_transmits < 0)
2855 return 0;
2856
2857 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2858 if (r < 0)
2859 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2860
2861 return 0;
2862 }
2863
2864 static int link_set_ipv6_hop_limit(Link *link) {
2865 int r;
2866
2867 /* Make this a NOP if IPv6 is not available */
2868 if (!socket_ipv6_is_supported())
2869 return 0;
2870
2871 if (link->flags & IFF_LOOPBACK)
2872 return 0;
2873
2874 if (!link->network)
2875 return 0;
2876
2877 if (link->network->ipv6_hop_limit < 0)
2878 return 0;
2879
2880 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2881 if (r < 0)
2882 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2883
2884 return 0;
2885 }
2886
2887 static int link_set_ipv6_mtu(Link *link) {
2888 int r;
2889
2890 /* Make this a NOP if IPv6 is not available */
2891 if (!socket_ipv6_is_supported())
2892 return 0;
2893
2894 if (link->flags & IFF_LOOPBACK)
2895 return 0;
2896
2897 if (link->network->ipv6_mtu == 0)
2898 return 0;
2899
2900 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2901 if (r < 0)
2902 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2903
2904 return 0;
2905 }
2906
2907 static bool link_is_static_address_configured(Link *link, Address *address) {
2908 Address *net_address;
2909
2910 assert(link);
2911 assert(address);
2912
2913 if (!link->network)
2914 return false;
2915
2916 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2917 if (address_equal(net_address, address))
2918 return true;
2919
2920 return false;
2921 }
2922
2923 static bool link_is_static_route_configured(Link *link, Route *route) {
2924 Route *net_route;
2925
2926 assert(link);
2927 assert(route);
2928
2929 if (!link->network)
2930 return false;
2931
2932 LIST_FOREACH(routes, net_route, link->network->static_routes)
2933 if (route_equal(net_route, route))
2934 return true;
2935
2936 return false;
2937 }
2938
2939 static int link_drop_foreign_config(Link *link) {
2940 Address *address;
2941 Route *route;
2942 Iterator i;
2943 int r;
2944
2945 SET_FOREACH(address, link->addresses_foreign, i) {
2946 /* we consider IPv6LL addresses to be managed by the kernel */
2947 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2948 continue;
2949
2950 if (link_is_static_address_configured(link, address)) {
2951 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2952 if (r < 0)
2953 return log_link_error_errno(link, r, "Failed to add address: %m");
2954 } else {
2955 r = address_remove(address, link, NULL);
2956 if (r < 0)
2957 return r;
2958 }
2959 }
2960
2961 SET_FOREACH(route, link->routes_foreign, i) {
2962 /* do not touch routes managed by the kernel */
2963 if (route->protocol == RTPROT_KERNEL)
2964 continue;
2965
2966 if (link_is_static_route_configured(link, route)) {
2967 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2968 if (r < 0)
2969 return r;
2970 } else {
2971 r = route_remove(route, link, NULL);
2972 if (r < 0)
2973 return r;
2974 }
2975 }
2976
2977 return 0;
2978 }
2979
2980 static int link_drop_config(Link *link) {
2981 Address *address, *pool_address;
2982 Route *route;
2983 Iterator i;
2984 int r;
2985
2986 SET_FOREACH(address, link->addresses, i) {
2987 /* we consider IPv6LL addresses to be managed by the kernel */
2988 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2989 continue;
2990
2991 r = address_remove(address, link, NULL);
2992 if (r < 0)
2993 return r;
2994
2995 /* If this address came from an address pool, clean up the pool */
2996 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2997 if (address_equal(address, pool_address)) {
2998 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2999 address_free(pool_address);
3000 break;
3001 }
3002 }
3003 }
3004
3005 SET_FOREACH(route, link->routes, i) {
3006 /* do not touch routes managed by the kernel */
3007 if (route->protocol == RTPROT_KERNEL)
3008 continue;
3009
3010 r = route_remove(route, link, NULL);
3011 if (r < 0)
3012 return r;
3013 }
3014
3015 ndisc_flush(link);
3016
3017 return 0;
3018 }
3019
3020 static int link_update_lldp(Link *link) {
3021 int r;
3022
3023 assert(link);
3024
3025 if (!link->lldp)
3026 return 0;
3027
3028 if (link->flags & IFF_UP) {
3029 r = sd_lldp_start(link->lldp);
3030 if (r < 0)
3031 return log_link_warning_errno(link, r, "Failed to start LLDP: %m");
3032 if (r > 0)
3033 log_link_debug(link, "Started LLDP.");
3034 } else {
3035 r = sd_lldp_stop(link->lldp);
3036 if (r < 0)
3037 return log_link_warning_errno(link, r, "Failed to stop LLDP: %m");
3038 if (r > 0)
3039 log_link_debug(link, "Stopped LLDP.");
3040 }
3041
3042 return r;
3043 }
3044
3045 static int link_configure_can(Link *link) {
3046 int r;
3047
3048 if (streq_ptr(link->kind, "can")) {
3049 /* The CAN interface must be down to configure bitrate, etc... */
3050 if ((link->flags & IFF_UP)) {
3051 r = link_down(link);
3052 if (r < 0) {
3053 link_enter_failed(link);
3054 return r;
3055 }
3056
3057 return 0;
3058 }
3059
3060 return link_set_can(link);
3061 }
3062
3063 if (!(link->flags & IFF_UP)) {
3064 r = link_up_can(link);
3065 if (r < 0) {
3066 link_enter_failed(link);
3067 return r;
3068 }
3069 }
3070
3071 return 0;
3072 }
3073
3074 static int link_configure(Link *link) {
3075 int r;
3076
3077 assert(link);
3078 assert(link->network);
3079 assert(link->state == LINK_STATE_INITIALIZED);
3080
3081 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
3082 return link_configure_can(link);
3083
3084 /* Drop foreign config, but ignore loopback or critical devices.
3085 * We do not want to remove loopback address or addresses used for root NFS. */
3086 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
3087 r = link_drop_foreign_config(link);
3088 if (r < 0)
3089 return r;
3090 }
3091
3092 r = link_set_proxy_arp(link);
3093 if (r < 0)
3094 return r;
3095
3096 r = ipv6_proxy_ndp_addresses_configure(link);
3097 if (r < 0)
3098 return r;
3099
3100 r = link_set_ipv4_forward(link);
3101 if (r < 0)
3102 return r;
3103
3104 r = link_set_ipv6_forward(link);
3105 if (r < 0)
3106 return r;
3107
3108 r = link_set_ipv6_privacy_extensions(link);
3109 if (r < 0)
3110 return r;
3111
3112 r = link_set_ipv6_accept_ra(link);
3113 if (r < 0)
3114 return r;
3115
3116 r = link_set_ipv6_dad_transmits(link);
3117 if (r < 0)
3118 return r;
3119
3120 r = link_set_ipv6_hop_limit(link);
3121 if (r < 0)
3122 return r;
3123
3124 r = link_set_flags(link);
3125 if (r < 0)
3126 return r;
3127
3128 r = link_set_ipv6_mtu(link);
3129 if (r < 0)
3130 return r;
3131
3132 if (link_ipv4ll_enabled(link) || link_ipv4ll_fallback_enabled(link)) {
3133 r = ipv4ll_configure(link);
3134 if (r < 0)
3135 return r;
3136 }
3137
3138 if (link_dhcp4_enabled(link)) {
3139 r = dhcp4_set_promote_secondaries(link);
3140 if (r < 0)
3141 return r;
3142
3143 r = dhcp4_configure(link);
3144 if (r < 0)
3145 return r;
3146 }
3147
3148 if (link_dhcp4_server_enabled(link)) {
3149 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
3150 if (r < 0)
3151 return r;
3152
3153 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
3154 if (r < 0)
3155 return r;
3156 }
3157
3158 if (link_dhcp6_enabled(link) ||
3159 link_ipv6_accept_ra_enabled(link)) {
3160 r = dhcp6_configure(link);
3161 if (r < 0)
3162 return r;
3163 }
3164
3165 if (link_ipv6_accept_ra_enabled(link)) {
3166 r = ndisc_configure(link);
3167 if (r < 0)
3168 return r;
3169 }
3170
3171 if (link_radv_enabled(link)) {
3172 r = radv_configure(link);
3173 if (r < 0)
3174 return r;
3175 }
3176
3177 if (link_lldp_rx_enabled(link)) {
3178 r = sd_lldp_new(&link->lldp);
3179 if (r < 0)
3180 return r;
3181
3182 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
3183 if (r < 0)
3184 return r;
3185
3186 r = sd_lldp_match_capabilities(link->lldp,
3187 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
3188 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
3189 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
3190 if (r < 0)
3191 return r;
3192
3193 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
3194 if (r < 0)
3195 return r;
3196
3197 r = sd_lldp_attach_event(link->lldp, NULL, 0);
3198 if (r < 0)
3199 return r;
3200
3201 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
3202 if (r < 0)
3203 return r;
3204
3205 r = link_update_lldp(link);
3206 if (r < 0)
3207 return r;
3208 }
3209
3210 r = link_set_mtu(link, link->network->mtu, link->network->mtu_is_set);
3211 if (r < 0)
3212 return r;
3213
3214 if (socket_ipv6_is_supported()) {
3215 r = link_configure_addrgen_mode(link);
3216 if (r < 0)
3217 return r;
3218 }
3219
3220 return link_configure_after_setting_mtu(link);
3221 }
3222
3223 static int link_configure_after_setting_mtu(Link *link) {
3224 int r;
3225
3226 assert(link);
3227 assert(link->network);
3228 assert(link->state == LINK_STATE_INITIALIZED);
3229
3230 if (link->setting_mtu)
3231 return 0;
3232
3233 if (link_has_carrier(link) || link->network->configure_without_carrier) {
3234 r = link_acquire_conf(link);
3235 if (r < 0)
3236 return r;
3237 }
3238
3239 return link_enter_join_netdev(link);
3240 }
3241
3242 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3243 assert(duid);
3244
3245 if (duid->raw_data_len > 0)
3246 return 0;
3247
3248 if (duid->type != DUID_TYPE_UUID)
3249 return -EINVAL;
3250
3251 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3252 duid->raw_data_len = sizeof(sd_id128_t);
3253
3254 return 1;
3255 }
3256
3257 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3258 Manager *manager = userdata;
3259 const sd_bus_error *e;
3260 const void *a;
3261 size_t sz;
3262 DUID *duid;
3263 Link *link;
3264 int r;
3265
3266 assert(m);
3267 assert(manager);
3268
3269 e = sd_bus_message_get_error(m);
3270 if (e) {
3271 log_error_errno(sd_bus_error_get_errno(e),
3272 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3273 e->message);
3274 goto configure;
3275 }
3276
3277 r = sd_bus_message_read_array(m, 'y', &a, &sz);
3278 if (r < 0)
3279 goto configure;
3280
3281 if (sz != sizeof(sd_id128_t)) {
3282 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3283 goto configure;
3284 }
3285
3286 memcpy(&manager->product_uuid, a, sz);
3287 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3288 (void) duid_set_uuid(duid, manager->product_uuid);
3289
3290 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3291
3292 configure:
3293 while ((link = set_steal_first(manager->links_requesting_uuid))) {
3294 r = link_configure(link);
3295 if (r < 0)
3296 log_link_error_errno(link, r, "Failed to configure link: %m");
3297 }
3298
3299 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3300
3301 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3302 * even if the method fails. */
3303 manager->has_product_uuid = true;
3304
3305 return 1;
3306 }
3307
3308 static bool link_requires_uuid(Link *link) {
3309 const DUID *duid;
3310
3311 assert(link);
3312 assert(link->manager);
3313 assert(link->network);
3314
3315 duid = link_get_duid(link);
3316 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3317 return false;
3318
3319 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3320 return true;
3321
3322 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3323 return true;
3324
3325 return false;
3326 }
3327
3328 static int link_configure_duid(Link *link) {
3329 Manager *m;
3330 DUID *duid;
3331 int r;
3332
3333 assert(link);
3334 assert(link->manager);
3335 assert(link->network);
3336
3337 m = link->manager;
3338 duid = link_get_duid(link);
3339
3340 if (!link_requires_uuid(link))
3341 return 1;
3342
3343 if (m->has_product_uuid) {
3344 (void) duid_set_uuid(duid, m->product_uuid);
3345 return 1;
3346 }
3347
3348 if (!m->links_requesting_uuid) {
3349 r = manager_request_product_uuid(m, link);
3350 if (r < 0) {
3351 if (r == -ENOMEM)
3352 return r;
3353
3354 log_link_warning_errno(link, r,
3355 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3356 return 1;
3357 }
3358 } else {
3359 r = set_put(m->links_requesting_uuid, link);
3360 if (r < 0)
3361 return log_oom();
3362
3363 r = set_put(m->duids_requesting_uuid, duid);
3364 if (r < 0)
3365 return log_oom();
3366 }
3367
3368 return 0;
3369 }
3370
3371 static int link_initialized_and_synced(Link *link) {
3372 Network *network;
3373 int r;
3374
3375 assert(link);
3376 assert(link->ifname);
3377 assert(link->manager);
3378
3379 /* We may get called either from the asynchronous netlink callback,
3380 * or directly for link_add() if running in a container. See link_add(). */
3381 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3382 return 0;
3383
3384 log_link_debug(link, "Link state is up-to-date");
3385 link_set_state(link, LINK_STATE_INITIALIZED);
3386
3387 r = link_new_bound_by_list(link);
3388 if (r < 0)
3389 return r;
3390
3391 r = link_handle_bound_by_list(link);
3392 if (r < 0)
3393 return r;
3394
3395 if (!link->network) {
3396 r = network_get(link->manager, link->sd_device, link->ifname,
3397 &link->mac, &network);
3398 if (r == -ENOENT) {
3399 link_enter_unmanaged(link);
3400 return 0;
3401 } else if (r == 0 && network->unmanaged) {
3402 link_enter_unmanaged(link);
3403 return 0;
3404 } else if (r < 0)
3405 return r;
3406
3407 if (link->flags & IFF_LOOPBACK) {
3408 if (network->link_local != ADDRESS_FAMILY_NO)
3409 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3410
3411 if (network->dhcp != ADDRESS_FAMILY_NO)
3412 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3413
3414 if (network->dhcp_server)
3415 log_link_debug(link, "Ignoring DHCP server for loopback link");
3416 }
3417
3418 r = network_apply(network, link);
3419 if (r < 0)
3420 return r;
3421 }
3422
3423 r = link_new_bound_to_list(link);
3424 if (r < 0)
3425 return r;
3426
3427 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3428 * link_configure() is called later asynchronously. */
3429 r = link_configure_duid(link);
3430 if (r <= 0)
3431 return r;
3432
3433 r = link_configure(link);
3434 if (r < 0)
3435 return r;
3436
3437 return 0;
3438 }
3439
3440 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3441 (void) link_initialized_and_synced(link);
3442 return 1;
3443 }
3444
3445 int link_initialized(Link *link, sd_device *device) {
3446 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3447 int r;
3448
3449 assert(link);
3450 assert(link->manager);
3451 assert(link->manager->rtnl);
3452 assert(device);
3453
3454 if (link->state != LINK_STATE_PENDING)
3455 return 0;
3456
3457 if (link->sd_device)
3458 return 0;
3459
3460 log_link_debug(link, "udev initialized link");
3461 link_set_state(link, LINK_STATE_INITIALIZED);
3462
3463 link->sd_device = sd_device_ref(device);
3464
3465 /* udev has initialized the link, but we don't know if we have yet
3466 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3467 * when it returns we know that the pending NEWLINKs have already been
3468 * processed and that we are up-to-date */
3469
3470 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3471 link->ifindex);
3472 if (r < 0)
3473 return r;
3474
3475 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3476 link_netlink_destroy_callback, link);
3477 if (r < 0)
3478 return r;
3479
3480 link_ref(link);
3481
3482 return 0;
3483 }
3484
3485 static int link_load(Link *link) {
3486 _cleanup_free_ char *network_file = NULL,
3487 *addresses = NULL,
3488 *routes = NULL,
3489 *dhcp4_address = NULL,
3490 *ipv4ll_address = NULL;
3491 union in_addr_union address;
3492 union in_addr_union route_dst;
3493 const char *p;
3494 int r;
3495
3496 assert(link);
3497
3498 r = parse_env_file(NULL, link->state_file,
3499 "NETWORK_FILE", &network_file,
3500 "ADDRESSES", &addresses,
3501 "ROUTES", &routes,
3502 "DHCP4_ADDRESS", &dhcp4_address,
3503 "IPV4LL_ADDRESS", &ipv4ll_address);
3504 if (r < 0 && r != -ENOENT)
3505 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3506
3507 if (network_file) {
3508 Network *network;
3509 char *suffix;
3510
3511 /* drop suffix */
3512 suffix = strrchr(network_file, '.');
3513 if (!suffix) {
3514 log_link_debug(link, "Failed to get network name from %s", network_file);
3515 goto network_file_fail;
3516 }
3517 *suffix = '\0';
3518
3519 r = network_get_by_name(link->manager, basename(network_file), &network);
3520 if (r < 0) {
3521 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3522 goto network_file_fail;
3523 }
3524
3525 r = network_apply(network, link);
3526 if (r < 0)
3527 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3528 }
3529
3530 network_file_fail:
3531
3532 if (addresses) {
3533 p = addresses;
3534
3535 for (;;) {
3536 _cleanup_free_ char *address_str = NULL;
3537 char *prefixlen_str;
3538 int family;
3539 unsigned char prefixlen;
3540
3541 r = extract_first_word(&p, &address_str, NULL, 0);
3542 if (r < 0) {
3543 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3544 continue;
3545 }
3546 if (r == 0)
3547 break;
3548
3549 prefixlen_str = strchr(address_str, '/');
3550 if (!prefixlen_str) {
3551 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3552 continue;
3553 }
3554
3555 *prefixlen_str++ = '\0';
3556
3557 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3558 if (r != 1) {
3559 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3560 continue;
3561 }
3562
3563 r = in_addr_from_string_auto(address_str, &family, &address);
3564 if (r < 0) {
3565 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3566 continue;
3567 }
3568
3569 r = address_add(link, family, &address, prefixlen, NULL);
3570 if (r < 0)
3571 return log_link_error_errno(link, r, "Failed to add address: %m");
3572 }
3573 }
3574
3575 if (routes) {
3576 p = routes;
3577
3578 for (;;) {
3579 Route *route;
3580 _cleanup_free_ char *route_str = NULL;
3581 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3582 usec_t lifetime;
3583 char *prefixlen_str;
3584 int family;
3585 unsigned char prefixlen, tos, table;
3586 uint32_t priority;
3587
3588 r = extract_first_word(&p, &route_str, NULL, 0);
3589 if (r < 0) {
3590 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3591 continue;
3592 }
3593 if (r == 0)
3594 break;
3595
3596 prefixlen_str = strchr(route_str, '/');
3597 if (!prefixlen_str) {
3598 log_link_debug(link, "Failed to parse route %s", route_str);
3599 continue;
3600 }
3601
3602 *prefixlen_str++ = '\0';
3603
3604 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3605 if (r != 5) {
3606 log_link_debug(link,
3607 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3608 prefixlen_str);
3609 continue;
3610 }
3611
3612 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3613 if (r < 0) {
3614 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3615 continue;
3616 }
3617
3618 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3619 if (r < 0)
3620 return log_link_error_errno(link, r, "Failed to add route: %m");
3621
3622 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3623 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3624 0, route_expire_handler, route);
3625 if (r < 0)
3626 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3627 }
3628
3629 route->lifetime = lifetime;
3630 sd_event_source_unref(route->expire);
3631 route->expire = TAKE_PTR(expire);
3632 }
3633 }
3634
3635 if (dhcp4_address) {
3636 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3637 if (r < 0) {
3638 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3639 goto dhcp4_address_fail;
3640 }
3641
3642 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3643 if (r < 0)
3644 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3645
3646 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3647 if (r < 0)
3648 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3649 }
3650
3651 dhcp4_address_fail:
3652
3653 if (ipv4ll_address) {
3654 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3655 if (r < 0) {
3656 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3657 goto ipv4ll_address_fail;
3658 }
3659
3660 r = sd_ipv4ll_new(&link->ipv4ll);
3661 if (r < 0)
3662 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3663
3664 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3665 if (r < 0)
3666 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3667 }
3668
3669 ipv4ll_address_fail:
3670
3671 return 0;
3672 }
3673
3674 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3675 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3676 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3677 Link *link;
3678 int r;
3679
3680 assert(m);
3681 assert(m->rtnl);
3682 assert(message);
3683 assert(ret);
3684
3685 r = link_new(m, message, ret);
3686 if (r < 0)
3687 return r;
3688
3689 link = *ret;
3690
3691 log_link_debug(link, "Link %d added", link->ifindex);
3692
3693 r = link_load(link);
3694 if (r < 0)
3695 return r;
3696
3697 if (detect_container() <= 0) {
3698 /* not in a container, udev will be around */
3699 sprintf(ifindex_str, "n%d", link->ifindex);
3700 r = sd_device_new_from_device_id(&device, ifindex_str);
3701 if (r < 0) {
3702 log_link_warning_errno(link, r, "Could not find device: %m");
3703 goto failed;
3704 }
3705
3706 r = sd_device_get_is_initialized(device);
3707 if (r < 0) {
3708 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3709 goto failed;
3710 }
3711 if (r == 0) {
3712 /* not yet ready */
3713 log_link_debug(link, "link pending udev initialization...");
3714 return 0;
3715 }
3716
3717 r = device_is_renaming(device);
3718 if (r < 0) {
3719 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3720 goto failed;
3721 }
3722 if (r > 0) {
3723 log_link_debug(link, "Interface is under renaming, pending initialization.");
3724 return 0;
3725 }
3726
3727 r = link_initialized(link, device);
3728 if (r < 0)
3729 goto failed;
3730 } else {
3731 r = link_initialized_and_synced(link);
3732 if (r < 0)
3733 goto failed;
3734 }
3735
3736 return 0;
3737 failed:
3738 link_enter_failed(link);
3739 return r;
3740 }
3741
3742 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3743 int r;
3744
3745 assert(link);
3746
3747 log_link_info(link, "Gained IPv6LL");
3748
3749 link->ipv6ll_address = *address;
3750 link_check_ready(link);
3751
3752 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3753 r = link_acquire_ipv6_conf(link);
3754 if (r < 0) {
3755 link_enter_failed(link);
3756 return r;
3757 }
3758 }
3759
3760 return 0;
3761 }
3762
3763 static int link_carrier_gained(Link *link) {
3764 int r;
3765
3766 assert(link);
3767
3768 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3769 r = link_acquire_conf(link);
3770 if (r < 0) {
3771 link_enter_failed(link);
3772 return r;
3773 }
3774
3775 r = link_request_set_addresses(link);
3776 if (r < 0)
3777 return r;
3778 }
3779
3780 r = link_handle_bound_by_list(link);
3781 if (r < 0)
3782 return r;
3783
3784 return 0;
3785 }
3786
3787 static int link_carrier_lost(Link *link) {
3788 int r;
3789
3790 assert(link);
3791
3792 if (link->network && link->network->ignore_carrier_loss)
3793 return 0;
3794
3795 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3796 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3797 * configuration and stop the clients as well. */
3798 if (link->setting_mtu)
3799 return 0;
3800
3801 r = link_stop_clients(link);
3802 if (r < 0) {
3803 link_enter_failed(link);
3804 return r;
3805 }
3806
3807 if (link_dhcp4_server_enabled(link))
3808 (void) sd_dhcp_server_stop(link->dhcp_server);
3809
3810 r = link_drop_config(link);
3811 if (r < 0)
3812 return r;
3813
3814 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3815 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3816 r = link_drop_foreign_config(link);
3817 if (r < 0)
3818 return r;
3819 }
3820
3821 r = link_handle_bound_by_list(link);
3822 if (r < 0)
3823 return r;
3824
3825 return 0;
3826 }
3827
3828 int link_carrier_reset(Link *link) {
3829 int r;
3830
3831 assert(link);
3832
3833 if (link_has_carrier(link)) {
3834 r = link_carrier_lost(link);
3835 if (r < 0)
3836 return r;
3837
3838 r = link_carrier_gained(link);
3839 if (r < 0)
3840 return r;
3841
3842 log_link_info(link, "Reset carrier");
3843 }
3844
3845 return 0;
3846 }
3847
3848 int link_update(Link *link, sd_netlink_message *m) {
3849 struct ether_addr mac;
3850 const char *ifname;
3851 uint32_t mtu;
3852 bool had_carrier, carrier_gained, carrier_lost;
3853 int r;
3854
3855 assert(link);
3856 assert(link->ifname);
3857 assert(m);
3858
3859 if (link->state == LINK_STATE_LINGER) {
3860 log_link_info(link, "Link re-added");
3861 link_set_state(link, LINK_STATE_CONFIGURING);
3862
3863 r = link_new_carrier_maps(link);
3864 if (r < 0)
3865 return r;
3866 }
3867
3868 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3869 if (r >= 0 && !streq(ifname, link->ifname)) {
3870 Manager *manager = link->manager;
3871
3872 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3873
3874 link_drop(link);
3875 r = link_add(manager, m, &link);
3876 if (r < 0)
3877 return r;
3878 }
3879
3880 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3881 if (r >= 0 && mtu > 0) {
3882 link->mtu = mtu;
3883 if (link->original_mtu == 0) {
3884 link->original_mtu = mtu;
3885 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3886 }
3887
3888 if (link->dhcp_client) {
3889 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3890 link->mtu);
3891 if (r < 0)
3892 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3893 }
3894
3895 if (link->radv) {
3896 r = sd_radv_set_mtu(link->radv, link->mtu);
3897 if (r < 0)
3898 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3899 }
3900 }
3901
3902 /* The kernel may broadcast NEWLINK messages without the MAC address
3903 set, simply ignore them. */
3904 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3905 if (r >= 0) {
3906 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3907 ETH_ALEN)) {
3908
3909 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3910 ETH_ALEN);
3911
3912 log_link_debug(link, "MAC address: "
3913 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3914 mac.ether_addr_octet[0],
3915 mac.ether_addr_octet[1],
3916 mac.ether_addr_octet[2],
3917 mac.ether_addr_octet[3],
3918 mac.ether_addr_octet[4],
3919 mac.ether_addr_octet[5]);
3920
3921 if (link->ipv4ll) {
3922 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3923 if (r < 0)
3924 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3925 }
3926
3927 if (link->dhcp_client) {
3928 r = sd_dhcp_client_set_mac(link->dhcp_client,
3929 (const uint8_t *) &link->mac,
3930 sizeof (link->mac),
3931 ARPHRD_ETHER);
3932 if (r < 0)
3933 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3934
3935 r = dhcp4_set_client_identifier(link);
3936 if (r < 0)
3937 return r;
3938 }
3939
3940 if (link->dhcp6_client) {
3941 const DUID* duid = link_get_duid(link);
3942
3943 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3944 (const uint8_t *) &link->mac,
3945 sizeof (link->mac),
3946 ARPHRD_ETHER);
3947 if (r < 0)
3948 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3949
3950 if (link->network->iaid_set) {
3951 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3952 link->network->iaid);
3953 if (r < 0)
3954 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3955 }
3956
3957 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3958 duid->type,
3959 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3960 duid->raw_data_len);
3961 if (r < 0)
3962 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3963 }
3964
3965 if (link->radv) {
3966 r = sd_radv_set_mac(link->radv, &link->mac);
3967 if (r < 0)
3968 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3969 }
3970
3971 if (link->ndisc) {
3972 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3973 if (r < 0)
3974 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3975 }
3976 }
3977 }
3978
3979 had_carrier = link_has_carrier(link);
3980
3981 r = link_update_flags(link, m);
3982 if (r < 0)
3983 return r;
3984
3985 r = link_update_lldp(link);
3986 if (r < 0)
3987 return r;
3988
3989 carrier_gained = !had_carrier && link_has_carrier(link);
3990 carrier_lost = had_carrier && !link_has_carrier(link);
3991
3992 if (carrier_gained) {
3993 log_link_info(link, "Gained carrier");
3994
3995 r = link_carrier_gained(link);
3996 if (r < 0)
3997 return r;
3998 } else if (carrier_lost) {
3999 log_link_info(link, "Lost carrier");
4000
4001 r = link_carrier_lost(link);
4002 if (r < 0)
4003 return r;
4004 }
4005
4006 return 0;
4007 }
4008
4009 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
4010 bool space = false;
4011 Iterator i;
4012 Link *link;
4013
4014 assert(f);
4015 assert(prefix);
4016
4017 if (hashmap_isempty(h))
4018 return;
4019
4020 fputs(prefix, f);
4021 HASHMAP_FOREACH(link, h, i) {
4022 if (space)
4023 fputc(' ', f);
4024
4025 fprintf(f, "%i", link->ifindex);
4026 space = true;
4027 }
4028
4029 fputc('\n', f);
4030 }
4031
4032 int link_save(Link *link) {
4033 _cleanup_free_ char *temp_path = NULL;
4034 _cleanup_fclose_ FILE *f = NULL;
4035 const char *admin_state, *oper_state;
4036 Address *a;
4037 Route *route;
4038 Iterator i;
4039 int r;
4040
4041 assert(link);
4042 assert(link->state_file);
4043 assert(link->lease_file);
4044 assert(link->manager);
4045
4046 if (link->state == LINK_STATE_LINGER) {
4047 (void) unlink(link->state_file);
4048 return 0;
4049 }
4050
4051 link_lldp_save(link);
4052
4053 admin_state = link_state_to_string(link->state);
4054 assert(admin_state);
4055
4056 oper_state = link_operstate_to_string(link->operstate);
4057 assert(oper_state);
4058
4059 r = fopen_temporary(link->state_file, &f, &temp_path);
4060 if (r < 0)
4061 goto fail;
4062
4063 (void) fchmod(fileno(f), 0644);
4064
4065 fprintf(f,
4066 "# This is private data. Do not parse.\n"
4067 "ADMIN_STATE=%s\n"
4068 "OPER_STATE=%s\n",
4069 admin_state, oper_state);
4070
4071 if (link->network) {
4072 bool space;
4073 sd_dhcp6_lease *dhcp6_lease = NULL;
4074 const char *dhcp_domainname = NULL;
4075 char **dhcp6_domains = NULL;
4076 char **dhcp_domains = NULL;
4077 unsigned j;
4078
4079 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4080 yes_no(link->network->required_for_online));
4081
4082 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
4083 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
4084
4085 if (link->dhcp6_client) {
4086 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
4087 if (r < 0 && r != -ENOMSG)
4088 log_link_debug(link, "No DHCPv6 lease");
4089 }
4090
4091 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4092
4093 fputs("DNS=", f);
4094 space = false;
4095
4096 for (j = 0; j < link->network->n_dns; j++) {
4097 _cleanup_free_ char *b = NULL;
4098
4099 r = in_addr_to_string(link->network->dns[j].family,
4100 &link->network->dns[j].address, &b);
4101 if (r < 0) {
4102 log_debug_errno(r, "Failed to format address, ignoring: %m");
4103 continue;
4104 }
4105
4106 if (space)
4107 fputc(' ', f);
4108 fputs(b, f);
4109 space = true;
4110 }
4111
4112 if (link->network->dhcp_use_dns &&
4113 link->dhcp_lease) {
4114 const struct in_addr *addresses;
4115
4116 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
4117 if (r > 0)
4118 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4119 space = true;
4120 }
4121
4122 if (link->network->dhcp_use_dns && dhcp6_lease) {
4123 struct in6_addr *in6_addrs;
4124
4125 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
4126 if (r > 0) {
4127 if (space)
4128 fputc(' ', f);
4129 serialize_in6_addrs(f, in6_addrs, r);
4130 space = true;
4131 }
4132 }
4133
4134 /* Make sure to flush out old entries before we use the NDISC data */
4135 ndisc_vacuum(link);
4136
4137 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4138 NDiscRDNSS *dd;
4139
4140 SET_FOREACH(dd, link->ndisc_rdnss, i) {
4141 if (space)
4142 fputc(' ', f);
4143
4144 serialize_in6_addrs(f, &dd->address, 1);
4145 space = true;
4146 }
4147 }
4148
4149 fputc('\n', f);
4150
4151 fputs("NTP=", f);
4152 space = false;
4153 fputstrv(f, link->network->ntp, NULL, &space);
4154
4155 if (link->network->dhcp_use_ntp &&
4156 link->dhcp_lease) {
4157 const struct in_addr *addresses;
4158
4159 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
4160 if (r > 0)
4161 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4162 space = true;
4163 }
4164
4165 if (link->network->dhcp_use_ntp && dhcp6_lease) {
4166 struct in6_addr *in6_addrs;
4167 char **hosts;
4168
4169 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
4170 &in6_addrs);
4171 if (r > 0) {
4172 if (space)
4173 fputc(' ', f);
4174 serialize_in6_addrs(f, in6_addrs, r);
4175 space = true;
4176 }
4177
4178 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
4179 if (r > 0)
4180 fputstrv(f, hosts, NULL, &space);
4181 }
4182
4183 fputc('\n', f);
4184
4185 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4186 if (link->dhcp_lease) {
4187 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4188 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4189 }
4190 if (dhcp6_lease)
4191 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4192 }
4193
4194 ordered_set_print(f, "DOMAINS=", link->network->search_domains);
4195
4196 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4197 NDiscDNSSL *dd;
4198
4199 if (dhcp_domainname)
4200 fputs_with_space(f, dhcp_domainname, NULL, &space);
4201 if (dhcp_domains)
4202 fputstrv(f, dhcp_domains, NULL, &space);
4203 if (dhcp6_domains)
4204 fputstrv(f, dhcp6_domains, NULL, &space);
4205
4206 SET_FOREACH(dd, link->ndisc_dnssl, i)
4207 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4208 }
4209
4210 fputc('\n', f);
4211
4212 ordered_set_print(f, "ROUTE_DOMAINS=", link->network->route_domains);
4213
4214 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4215 NDiscDNSSL *dd;
4216
4217 if (dhcp_domainname)
4218 fputs_with_space(f, dhcp_domainname, NULL, &space);
4219 if (dhcp_domains)
4220 fputstrv(f, dhcp_domains, NULL, &space);
4221 if (dhcp6_domains)
4222 fputstrv(f, dhcp6_domains, NULL, &space);
4223
4224 SET_FOREACH(dd, link->ndisc_dnssl, i)
4225 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4226 }
4227
4228 fputc('\n', f);
4229
4230 fprintf(f, "LLMNR=%s\n",
4231 resolve_support_to_string(link->network->llmnr));
4232 fprintf(f, "MDNS=%s\n",
4233 resolve_support_to_string(link->network->mdns));
4234 if (link->network->dns_default_route >= 0)
4235 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
4236
4237 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4238 fprintf(f, "DNS_OVER_TLS=%s\n",
4239 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
4240
4241 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
4242 fprintf(f, "DNSSEC=%s\n",
4243 dnssec_mode_to_string(link->network->dnssec_mode));
4244
4245 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
4246 const char *n;
4247
4248 fputs("DNSSEC_NTA=", f);
4249 space = false;
4250 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
4251 fputs_with_space(f, n, NULL, &space);
4252 fputc('\n', f);
4253 }
4254
4255 fputs("ADDRESSES=", f);
4256 space = false;
4257 SET_FOREACH(a, link->addresses, i) {
4258 _cleanup_free_ char *address_str = NULL;
4259
4260 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4261 if (r < 0)
4262 goto fail;
4263
4264 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4265 space = true;
4266 }
4267 fputc('\n', f);
4268
4269 fputs("ROUTES=", f);
4270 space = false;
4271 SET_FOREACH(route, link->routes, i) {
4272 _cleanup_free_ char *route_str = NULL;
4273
4274 r = in_addr_to_string(route->family, &route->dst, &route_str);
4275 if (r < 0)
4276 goto fail;
4277
4278 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4279 space ? " " : "", route_str,
4280 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4281 space = true;
4282 }
4283
4284 fputc('\n', f);
4285 }
4286
4287 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4288 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4289
4290 if (link->dhcp_lease) {
4291 struct in_addr address;
4292 const char *tz = NULL;
4293
4294 assert(link->network);
4295
4296 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
4297 if (r >= 0)
4298 fprintf(f, "TIMEZONE=%s\n", tz);
4299
4300 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
4301 if (r >= 0) {
4302 fputs("DHCP4_ADDRESS=", f);
4303 serialize_in_addrs(f, &address, 1, false, NULL);
4304 fputc('\n', f);
4305 }
4306
4307 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4308 if (r < 0)
4309 goto fail;
4310
4311 fprintf(f,
4312 "DHCP_LEASE=%s\n",
4313 link->lease_file);
4314 } else
4315 (void) unlink(link->lease_file);
4316
4317 if (link->ipv4ll) {
4318 struct in_addr address;
4319
4320 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4321 if (r >= 0) {
4322 fputs("IPV4LL_ADDRESS=", f);
4323 serialize_in_addrs(f, &address, 1, false, NULL);
4324 fputc('\n', f);
4325 }
4326 }
4327
4328 r = fflush_and_check(f);
4329 if (r < 0)
4330 goto fail;
4331
4332 if (rename(temp_path, link->state_file) < 0) {
4333 r = -errno;
4334 goto fail;
4335 }
4336
4337 return 0;
4338
4339 fail:
4340 (void) unlink(link->state_file);
4341 if (temp_path)
4342 (void) unlink(temp_path);
4343
4344 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4345 }
4346
4347 /* The serialized state in /run is no longer up-to-date. */
4348 void link_dirty(Link *link) {
4349 int r;
4350
4351 assert(link);
4352
4353 /* mark manager dirty as link is dirty */
4354 manager_dirty(link->manager);
4355
4356 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
4357 if (r < 0)
4358 /* allocation errors are ignored */
4359 return;
4360
4361 r = set_put(link->manager->dirty_links, link);
4362 if (r <= 0)
4363 /* don't take another ref if the link was already dirty */
4364 return;
4365
4366 link_ref(link);
4367 }
4368
4369 /* The serialized state in /run is up-to-date */
4370 void link_clean(Link *link) {
4371 assert(link);
4372 assert(link->manager);
4373
4374 link_unref(set_remove(link->manager->dirty_links, link));
4375 }
4376
4377 static const char* const link_state_table[_LINK_STATE_MAX] = {
4378 [LINK_STATE_PENDING] = "pending",
4379 [LINK_STATE_INITIALIZED] = "initialized",
4380 [LINK_STATE_CONFIGURING] = "configuring",
4381 [LINK_STATE_CONFIGURED] = "configured",
4382 [LINK_STATE_UNMANAGED] = "unmanaged",
4383 [LINK_STATE_FAILED] = "failed",
4384 [LINK_STATE_LINGER] = "linger",
4385 };
4386
4387 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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