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network: add support to configure proxy ARP/WIFI
[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_lldp_emit_enabled(Link *link) {
220 assert(link);
221
222 if (link->flags & IFF_LOOPBACK)
223 return false;
224
225 if (link->iftype != ARPHRD_ETHER)
226 return false;
227
228 if (!link->network)
229 return false;
230
231 return link->network->lldp_emit != LLDP_EMIT_NO;
232 }
233
234 static bool link_ipv4_forward_enabled(Link *link) {
235 assert(link);
236
237 if (link->flags & IFF_LOOPBACK)
238 return false;
239
240 if (!link->network)
241 return false;
242
243 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
244 return false;
245
246 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
247 }
248
249 static bool link_ipv6_forward_enabled(Link *link) {
250 assert(link);
251
252 if (!socket_ipv6_is_supported())
253 return false;
254
255 if (link->flags & IFF_LOOPBACK)
256 return false;
257
258 if (!link->network)
259 return false;
260
261 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
262 return false;
263
264 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
265 return false;
266
267 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
268 }
269
270 static bool link_proxy_arp_enabled(Link *link) {
271 assert(link);
272
273 if (link->flags & IFF_LOOPBACK)
274 return false;
275
276 if (!link->network)
277 return false;
278
279 if (link->network->proxy_arp < 0)
280 return false;
281
282 return true;
283 }
284
285 static bool link_ipv6_accept_ra_enabled(Link *link) {
286 assert(link);
287
288 if (!socket_ipv6_is_supported())
289 return false;
290
291 if (link->flags & IFF_LOOPBACK)
292 return false;
293
294 if (!link->network)
295 return false;
296
297 if (!link_ipv6ll_enabled(link))
298 return false;
299
300 /* If unset use system default (enabled if local forwarding is disabled.
301 * disabled if local forwarding is enabled).
302 * If set, ignore or enforce RA independent of local forwarding state.
303 */
304 if (link->network->ipv6_accept_ra < 0)
305 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
306 return !link_ipv6_forward_enabled(link);
307 else if (link->network->ipv6_accept_ra > 0)
308 /* accept RA even if ip_forward is enabled */
309 return true;
310 else
311 /* ignore RA */
312 return false;
313 }
314
315 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
316 assert(link);
317
318 if (!socket_ipv6_is_supported())
319 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
320
321 if (link->flags & IFF_LOOPBACK)
322 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
323
324 if (!link->network)
325 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
326
327 return link->network->ipv6_privacy_extensions;
328 }
329
330 static int link_enable_ipv6(Link *link) {
331 bool disabled;
332 int r;
333
334 if (link->flags & IFF_LOOPBACK)
335 return 0;
336
337 disabled = !link_ipv6_enabled(link);
338
339 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", disabled);
340 if (r < 0)
341 log_link_warning_errno(link, r, "Cannot %s IPv6: %m", enable_disable(!disabled));
342 else
343 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
344
345 return 0;
346 }
347
348 static bool link_is_enslaved(Link *link) {
349 if (link->flags & IFF_SLAVE)
350 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
351 return true;
352
353 if (!link->enslaved_raw)
354 return false;
355
356 if (!link->network)
357 return false;
358
359 if (link->network->bridge)
360 /* TODO: support the case when link is not managed by networkd. */
361 return true;
362
363 return false;
364 }
365
366 static void link_update_master_operstate(Link *link, NetDev *netdev) {
367 Link *master;
368
369 if (!netdev)
370 return;
371
372 if (link_get(link->manager, netdev->ifindex, &master) < 0)
373 return;
374
375 link_update_operstate(master, true);
376 }
377
378 void link_update_operstate(Link *link, bool also_update_master) {
379 LinkOperationalState operstate;
380 Iterator i;
381
382 assert(link);
383
384 if (link->kernel_operstate == IF_OPER_DORMANT)
385 operstate = LINK_OPERSTATE_DORMANT;
386 else if (link_has_carrier(link)) {
387 Address *address;
388 uint8_t scope = RT_SCOPE_NOWHERE;
389
390 /* if we have carrier, check what addresses we have */
391 SET_FOREACH(address, link->addresses, i) {
392 if (!address_is_ready(address))
393 continue;
394
395 if (address->scope < scope)
396 scope = address->scope;
397 }
398
399 /* for operstate we also take foreign addresses into account */
400 SET_FOREACH(address, link->addresses_foreign, i) {
401 if (!address_is_ready(address))
402 continue;
403
404 if (address->scope < scope)
405 scope = address->scope;
406 }
407
408 if (scope < RT_SCOPE_SITE)
409 /* universally accessible addresses found */
410 operstate = LINK_OPERSTATE_ROUTABLE;
411 else if (scope < RT_SCOPE_HOST)
412 /* only link or site local addresses found */
413 operstate = LINK_OPERSTATE_DEGRADED;
414 else
415 /* no useful addresses found */
416 operstate = LINK_OPERSTATE_CARRIER;
417 } else if (link->flags & IFF_UP)
418 operstate = LINK_OPERSTATE_NO_CARRIER;
419 else
420 operstate = LINK_OPERSTATE_OFF;
421
422 if (IN_SET(operstate, LINK_OPERSTATE_DEGRADED, LINK_OPERSTATE_CARRIER) &&
423 link_is_enslaved(link))
424 operstate = LINK_OPERSTATE_ENSLAVED;
425
426 if (operstate >= LINK_OPERSTATE_CARRIER) {
427 Link *slave;
428
429 SET_FOREACH(slave, link->slaves, i) {
430 link_update_operstate(slave, false);
431
432 if (slave->operstate < LINK_OPERSTATE_CARRIER)
433 operstate = LINK_OPERSTATE_DEGRADED_CARRIER;
434 }
435 }
436
437 if (link->operstate != operstate) {
438 link->operstate = operstate;
439 link_send_changed(link, "OperationalState", NULL);
440 link_dirty(link);
441 }
442
443 if (also_update_master && link->network) {
444 link_update_master_operstate(link, link->network->bond);
445 link_update_master_operstate(link, link->network->bridge);
446 }
447 }
448
449 #define FLAG_STRING(string, flag, old, new) \
450 (((old ^ new) & flag) \
451 ? ((old & flag) ? (" -" string) : (" +" string)) \
452 : "")
453
454 static int link_update_flags(Link *link, sd_netlink_message *m) {
455 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
456 uint8_t operstate;
457 int r;
458
459 assert(link);
460
461 r = sd_rtnl_message_link_get_flags(m, &flags);
462 if (r < 0)
463 return log_link_warning_errno(link, r, "Could not get link flags: %m");
464
465 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
466 if (r < 0)
467 /* if we got a message without operstate, take it to mean
468 the state was unchanged */
469 operstate = link->kernel_operstate;
470
471 if ((link->flags == flags) && (link->kernel_operstate == operstate))
472 return 0;
473
474 if (link->flags != flags) {
475 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",
476 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
477 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
478 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
479 FLAG_STRING("UP", IFF_UP, link->flags, flags),
480 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
481 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
482 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
483 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
484 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
485 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
486 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
487 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
488 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
489 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
490 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
491 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
492 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
493 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
494 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
495
496 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
497 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
498 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
499 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
500 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
501 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
502 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
503 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
504
505 /* link flags are currently at most 18 bits, let's align to
506 * printing 20 */
507 if (unknown_flags_added)
508 log_link_debug(link,
509 "Unknown link flags gained: %#.5x (ignoring)",
510 unknown_flags_added);
511
512 if (unknown_flags_removed)
513 log_link_debug(link,
514 "Unknown link flags lost: %#.5x (ignoring)",
515 unknown_flags_removed);
516 }
517
518 link->flags = flags;
519 link->kernel_operstate = operstate;
520
521 link_update_operstate(link, true);
522
523 return 0;
524 }
525
526 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
527 _cleanup_(link_unrefp) Link *link = NULL;
528 uint16_t type;
529 const char *ifname, *kind = NULL;
530 int r, ifindex;
531 unsigned short iftype;
532
533 assert(manager);
534 assert(message);
535 assert(ret);
536
537 /* check for link kind */
538 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
539 if (r == 0) {
540 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
541 r = sd_netlink_message_exit_container(message);
542 if (r < 0)
543 return r;
544 }
545
546 r = sd_netlink_message_get_type(message, &type);
547 if (r < 0)
548 return r;
549 else if (type != RTM_NEWLINK)
550 return -EINVAL;
551
552 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
553 if (r < 0)
554 return r;
555 else if (ifindex <= 0)
556 return -EINVAL;
557
558 r = sd_rtnl_message_link_get_type(message, &iftype);
559 if (r < 0)
560 return r;
561
562 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
563 if (r < 0)
564 return r;
565
566 link = new(Link, 1);
567 if (!link)
568 return -ENOMEM;
569
570 *link = (Link) {
571 .n_ref = 1,
572 .manager = manager,
573 .state = LINK_STATE_PENDING,
574 .rtnl_extended_attrs = true,
575 .ifindex = ifindex,
576 .iftype = iftype,
577 };
578
579 link->ifname = strdup(ifname);
580 if (!link->ifname)
581 return -ENOMEM;
582
583 if (kind) {
584 link->kind = strdup(kind);
585 if (!link->kind)
586 return -ENOMEM;
587 }
588
589 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
590 if (r < 0)
591 log_link_debug_errno(link, r, "New device has no master, continuing without");
592
593 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
594 if (r < 0)
595 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
596
597 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
598 return -ENOMEM;
599
600 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
601 return -ENOMEM;
602
603 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
604 return -ENOMEM;
605
606 r = hashmap_ensure_allocated(&manager->links, NULL);
607 if (r < 0)
608 return r;
609
610 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
611 if (r < 0)
612 return r;
613
614 r = link_update_flags(link, message);
615 if (r < 0)
616 return r;
617
618 *ret = TAKE_PTR(link);
619
620 return 0;
621 }
622
623 static Link *link_free(Link *link) {
624 Address *address;
625
626 assert(link);
627
628 link->routes = set_free_with_destructor(link->routes, route_free);
629 link->routes_foreign = set_free_with_destructor(link->routes_foreign, route_free);
630
631 link->addresses = set_free_with_destructor(link->addresses, address_free);
632 link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free);
633
634 while ((address = link->pool_addresses)) {
635 LIST_REMOVE(addresses, link->pool_addresses, address);
636 address_free(address);
637 }
638
639 sd_dhcp_server_unref(link->dhcp_server);
640 sd_dhcp_client_unref(link->dhcp_client);
641 sd_dhcp_lease_unref(link->dhcp_lease);
642
643 link_lldp_emit_stop(link);
644
645 free(link->lease_file);
646
647 sd_lldp_unref(link->lldp);
648 free(link->lldp_file);
649
650 ndisc_flush(link);
651
652 sd_ipv4ll_unref(link->ipv4ll);
653 sd_dhcp6_client_unref(link->dhcp6_client);
654 sd_ndisc_unref(link->ndisc);
655 sd_radv_unref(link->radv);
656
657 free(link->ifname);
658 free(link->kind);
659
660 (void) unlink(link->state_file);
661 free(link->state_file);
662
663 sd_device_unref(link->sd_device);
664
665 hashmap_free(link->bound_to_links);
666 hashmap_free(link->bound_by_links);
667
668 set_free_with_destructor(link->slaves, link_unref);
669
670 network_unref(link->network);
671
672 return mfree(link);
673 }
674
675 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
676
677 int link_get(Manager *m, int ifindex, Link **ret) {
678 Link *link;
679
680 assert(m);
681 assert(ifindex);
682 assert(ret);
683
684 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
685 if (!link)
686 return -ENODEV;
687
688 *ret = link;
689
690 return 0;
691 }
692
693 static void link_set_state(Link *link, LinkState state) {
694 assert(link);
695
696 if (link->state == state)
697 return;
698
699 log_link_debug(link, "State changed: %s -> %s",
700 link_state_to_string(link->state),
701 link_state_to_string(state));
702
703 link->state = state;
704
705 link_send_changed(link, "AdministrativeState", NULL);
706 }
707
708 static void link_enter_unmanaged(Link *link) {
709 assert(link);
710
711 log_link_debug(link, "Unmanaged");
712
713 link_set_state(link, LINK_STATE_UNMANAGED);
714
715 link_dirty(link);
716 }
717
718 int link_stop_clients(Link *link) {
719 int r = 0, k;
720
721 assert(link);
722 assert(link->manager);
723 assert(link->manager->event);
724
725 if (link->dhcp_client) {
726 k = sd_dhcp_client_stop(link->dhcp_client);
727 if (k < 0)
728 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
729 }
730
731 if (link->ipv4ll) {
732 k = sd_ipv4ll_stop(link->ipv4ll);
733 if (k < 0)
734 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
735 }
736
737 if (link->dhcp6_client) {
738 k = sd_dhcp6_client_stop(link->dhcp6_client);
739 if (k < 0)
740 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
741 }
742
743 if (link->ndisc) {
744 k = sd_ndisc_stop(link->ndisc);
745 if (k < 0)
746 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
747 }
748
749 if (link->radv) {
750 k = sd_radv_stop(link->radv);
751 if (k < 0)
752 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
753 }
754
755 link_lldp_emit_stop(link);
756 return r;
757 }
758
759 void link_enter_failed(Link *link) {
760 assert(link);
761
762 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
763 return;
764
765 log_link_warning(link, "Failed");
766
767 link_set_state(link, LINK_STATE_FAILED);
768
769 link_stop_clients(link);
770
771 link_dirty(link);
772 }
773
774 static Address* link_find_dhcp_server_address(Link *link) {
775 Address *address;
776
777 assert(link);
778 assert(link->network);
779
780 /* The first statically configured address if there is any */
781 LIST_FOREACH(addresses, address, link->network->static_addresses) {
782
783 if (address->family != AF_INET)
784 continue;
785
786 if (in_addr_is_null(address->family, &address->in_addr))
787 continue;
788
789 return address;
790 }
791
792 /* If that didn't work, find a suitable address we got from the pool */
793 LIST_FOREACH(addresses, address, link->pool_addresses) {
794 if (address->family != AF_INET)
795 continue;
796
797 return address;
798 }
799
800 return NULL;
801 }
802
803 static int link_join_netdevs_after_configured(Link *link) {
804 NetDev *netdev;
805 Iterator i;
806 int r;
807
808 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
809 if (netdev->ifindex > 0)
810 /* Assume already enslaved. */
811 continue;
812
813 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
814 continue;
815
816 log_struct(LOG_DEBUG,
817 LOG_LINK_INTERFACE(link),
818 LOG_NETDEV_INTERFACE(netdev),
819 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
820
821 r = netdev_join(netdev, link, NULL);
822 if (r < 0)
823 return log_struct_errno(LOG_WARNING, r,
824 LOG_LINK_INTERFACE(link),
825 LOG_NETDEV_INTERFACE(netdev),
826 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
827 }
828
829 return 0;
830 }
831
832 static void link_enter_configured(Link *link) {
833 assert(link);
834 assert(link->network);
835
836 if (link->state != LINK_STATE_CONFIGURING)
837 return;
838
839 log_link_info(link, "Configured");
840
841 link_set_state(link, LINK_STATE_CONFIGURED);
842
843 (void) link_join_netdevs_after_configured(link);
844
845 link_dirty(link);
846 }
847
848 static int link_request_set_routing_policy_rule(Link *link) {
849 RoutingPolicyRule *rule, *rrule = NULL;
850 int r;
851
852 assert(link);
853 assert(link->network);
854
855 link_set_state(link, LINK_STATE_CONFIGURING);
856 link->routing_policy_rules_configured = false;
857
858 LIST_FOREACH(rules, rule, link->network->rules) {
859 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
860 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif,
861 rule->protocol, &rule->sport, &rule->dport, &rrule);
862 if (r == 0) {
863 (void) routing_policy_rule_make_local(link->manager, rrule);
864 continue;
865 }
866
867 r = routing_policy_rule_configure(rule, link, NULL, false);
868 if (r < 0) {
869 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
870 link_enter_failed(link);
871 return r;
872 }
873
874 link->routing_policy_rule_messages++;
875 }
876
877 routing_policy_rule_purge(link->manager, link);
878 if (link->routing_policy_rule_messages == 0) {
879 link->routing_policy_rules_configured = true;
880 link_check_ready(link);
881 } else
882 log_link_debug(link, "Setting routing policy rules");
883
884 return 0;
885 }
886
887 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
888 int r;
889
890 assert(link);
891 assert(link->route_messages > 0);
892 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
893 LINK_STATE_FAILED, LINK_STATE_LINGER));
894
895 link->route_messages--;
896
897 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
898 return 1;
899
900 r = sd_netlink_message_get_errno(m);
901 if (r < 0 && r != -EEXIST)
902 log_link_warning_errno(link, r, "Could not set route: %m");
903
904 if (link->route_messages == 0) {
905 log_link_debug(link, "Routes set");
906 link->static_routes_configured = true;
907 link_check_ready(link);
908 }
909
910 return 1;
911 }
912
913 int link_request_set_routes(Link *link) {
914 enum {
915 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
916 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
917 _PHASE_MAX
918 } phase;
919 Route *rt;
920 int r;
921
922 assert(link);
923 assert(link->network);
924 assert(link->addresses_configured);
925 assert(link->address_messages == 0);
926 assert(link->state != _LINK_STATE_INVALID);
927
928 link_set_state(link, LINK_STATE_CONFIGURING);
929 link->static_routes_configured = false;
930
931 r = link_request_set_routing_policy_rule(link);
932 if (r < 0)
933 return r;
934
935 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
936 for (phase = 0; phase < _PHASE_MAX; phase++)
937 LIST_FOREACH(routes, rt, link->network->static_routes) {
938
939 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
940 continue;
941
942 r = route_configure(rt, link, route_handler);
943 if (r < 0) {
944 log_link_warning_errno(link, r, "Could not set routes: %m");
945 link_enter_failed(link);
946 return r;
947 }
948
949 link->route_messages++;
950 }
951
952 if (link->route_messages == 0) {
953 link->static_routes_configured = true;
954 link_check_ready(link);
955 } else
956 log_link_debug(link, "Setting routes");
957
958 return 0;
959 }
960
961 void link_check_ready(Link *link) {
962 Address *a;
963 Iterator i;
964
965 assert(link);
966
967 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
968 return;
969
970 if (!link->network)
971 return;
972
973 if (!link->addresses_configured)
974 return;
975
976 if (!link->neighbors_configured)
977 return;
978
979 SET_FOREACH(a, link->addresses, i)
980 if (!address_is_ready(a))
981 return;
982
983 if (!link->addresses_ready) {
984 link->addresses_ready = true;
985 link_request_set_routes(link);
986 }
987
988 if (!link->static_routes_configured)
989 return;
990
991 if (!link->routing_policy_rules_configured)
992 return;
993
994 if (link_ipv4ll_enabled(link) && !(link->ipv4ll_address && link->ipv4ll_route))
995 return;
996
997 if (link_ipv6ll_enabled(link) &&
998 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
999 return;
1000
1001 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
1002 !(link->dhcp4_configured || link->dhcp6_configured) &&
1003 !(link_ipv4ll_fallback_enabled(link) && link->ipv4ll_address && link->ipv4ll_route))
1004 /* When DHCP is enabled, at least one protocol must provide an address, or
1005 * an IPv4ll fallback address must be configured. */
1006 return;
1007
1008 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
1009 return;
1010
1011 if (link->state != LINK_STATE_CONFIGURED)
1012 link_enter_configured(link);
1013
1014 return;
1015 }
1016
1017 static int link_request_set_neighbors(Link *link) {
1018 Neighbor *neighbor;
1019 int r;
1020
1021 assert(link);
1022 assert(link->network);
1023 assert(link->state != _LINK_STATE_INVALID);
1024
1025 link_set_state(link, LINK_STATE_CONFIGURING);
1026 link->neighbors_configured = false;
1027
1028 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1029 r = neighbor_configure(neighbor, link, NULL);
1030 if (r < 0) {
1031 log_link_warning_errno(link, r, "Could not set neighbor: %m");
1032 link_enter_failed(link);
1033 return r;
1034 }
1035 }
1036
1037 if (link->neighbor_messages == 0) {
1038 link->neighbors_configured = true;
1039 link_check_ready(link);
1040 } else
1041 log_link_debug(link, "Setting neighbors");
1042
1043 return 0;
1044 }
1045
1046 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1047 int r;
1048
1049 assert(rtnl);
1050 assert(m);
1051 assert(link);
1052 assert(link->ifname);
1053 assert(link->address_messages > 0);
1054 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1055 LINK_STATE_FAILED, LINK_STATE_LINGER));
1056
1057 link->address_messages--;
1058
1059 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1060 return 1;
1061
1062 r = sd_netlink_message_get_errno(m);
1063 if (r < 0 && r != -EEXIST)
1064 log_link_warning_errno(link, r, "could not set address: %m");
1065 else if (r >= 0)
1066 manager_rtnl_process_address(rtnl, m, link->manager);
1067
1068 if (link->address_messages == 0) {
1069 log_link_debug(link, "Addresses set");
1070 link->addresses_configured = true;
1071 link_check_ready(link);
1072 }
1073
1074 return 1;
1075 }
1076
1077 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1078 _cleanup_free_ struct in_addr *addresses = NULL;
1079 size_t n_addresses = 0, n_allocated = 0;
1080 unsigned i;
1081
1082 log_debug("Copying DNS server information from %s", link->ifname);
1083
1084 if (!link->network)
1085 return 0;
1086
1087 for (i = 0; i < link->network->n_dns; i++) {
1088 struct in_addr ia;
1089
1090 /* Only look for IPv4 addresses */
1091 if (link->network->dns[i].family != AF_INET)
1092 continue;
1093
1094 ia = link->network->dns[i].address.in;
1095
1096 /* Never propagate obviously borked data */
1097 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1098 continue;
1099
1100 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1101 return log_oom();
1102
1103 addresses[n_addresses++] = ia;
1104 }
1105
1106 if (link->network->dhcp_use_dns && link->dhcp_lease) {
1107 const struct in_addr *da = NULL;
1108 int j, n;
1109
1110 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
1111 if (n > 0) {
1112
1113 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1114 return log_oom();
1115
1116 for (j = 0; j < n; j++)
1117 if (in4_addr_is_non_local(&da[j]))
1118 addresses[n_addresses++] = da[j];
1119 }
1120 }
1121
1122 if (n_addresses <= 0)
1123 return 0;
1124
1125 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
1126 }
1127
1128 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1129 _cleanup_free_ struct in_addr *addresses = NULL;
1130 size_t n_addresses = 0, n_allocated = 0;
1131 char **a;
1132
1133 if (!link->network)
1134 return 0;
1135
1136 log_debug("Copying NTP server information from %s", link->ifname);
1137
1138 STRV_FOREACH(a, link->network->ntp) {
1139 union in_addr_union ia;
1140
1141 /* Only look for IPv4 addresses */
1142 if (in_addr_from_string(AF_INET, *a, &ia) <= 0)
1143 continue;
1144
1145 /* Never propagate obviously borked data */
1146 if (in4_addr_is_null(&ia.in) || in4_addr_is_localhost(&ia.in))
1147 continue;
1148
1149 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1150 return log_oom();
1151
1152 addresses[n_addresses++] = ia.in;
1153 }
1154
1155 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1156 const struct in_addr *da = NULL;
1157 int j, n;
1158
1159 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1160 if (n > 0) {
1161
1162 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1163 return log_oom();
1164
1165 for (j = 0; j < n; j++)
1166 if (in4_addr_is_non_local(&da[j]))
1167 addresses[n_addresses++] = da[j];
1168 }
1169 }
1170
1171 if (n_addresses <= 0)
1172 return 0;
1173
1174 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1175 }
1176
1177 static int link_set_bridge_fdb(Link *link) {
1178 FdbEntry *fdb_entry;
1179 int r;
1180
1181 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1182 r = fdb_entry_configure(link, fdb_entry);
1183 if (r < 0)
1184 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1185 }
1186
1187 return 0;
1188 }
1189
1190 static int link_request_set_addresses(Link *link) {
1191 AddressLabel *label;
1192 Address *ad;
1193 int r;
1194
1195 assert(link);
1196 assert(link->network);
1197 assert(link->state != _LINK_STATE_INVALID);
1198
1199 link_set_state(link, LINK_STATE_CONFIGURING);
1200
1201 /* Reset all *_configured flags we are configuring. */
1202 link->addresses_configured = false;
1203 link->addresses_ready = false;
1204 link->neighbors_configured = false;
1205 link->static_routes_configured = false;
1206 link->routing_policy_rules_configured = false;
1207
1208 r = link_set_bridge_fdb(link);
1209 if (r < 0)
1210 return r;
1211
1212 r = link_request_set_neighbors(link);
1213 if (r < 0)
1214 return r;
1215
1216 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1217 bool update;
1218
1219 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1220
1221 r = address_configure(ad, link, address_handler, update);
1222 if (r < 0) {
1223 log_link_warning_errno(link, r, "Could not set addresses: %m");
1224 link_enter_failed(link);
1225 return r;
1226 }
1227
1228 link->address_messages++;
1229 }
1230
1231 LIST_FOREACH(labels, label, link->network->address_labels) {
1232 r = address_label_configure(label, link, NULL, false);
1233 if (r < 0) {
1234 log_link_warning_errno(link, r, "Could not set address label: %m");
1235 link_enter_failed(link);
1236 return r;
1237 }
1238
1239 link->address_label_messages++;
1240 }
1241
1242 /* now that we can figure out a default address for the dhcp server,
1243 start it */
1244 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1245 Address *address;
1246 Link *uplink = NULL;
1247 bool acquired_uplink = false;
1248
1249 address = link_find_dhcp_server_address(link);
1250 if (!address) {
1251 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1252 link_enter_failed(link);
1253 return 0;
1254 }
1255
1256 /* use the server address' subnet as the pool */
1257 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1258 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1259 if (r < 0)
1260 return r;
1261
1262 /* TODO:
1263 r = sd_dhcp_server_set_router(link->dhcp_server,
1264 &main_address->in_addr.in);
1265 if (r < 0)
1266 return r;
1267 */
1268
1269 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1270 r = sd_dhcp_server_set_max_lease_time(
1271 link->dhcp_server,
1272 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1273 if (r < 0)
1274 return r;
1275 }
1276
1277 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1278 r = sd_dhcp_server_set_default_lease_time(
1279 link->dhcp_server,
1280 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1281 if (r < 0)
1282 return r;
1283 }
1284
1285 if (link->network->dhcp_server_emit_dns) {
1286
1287 if (link->network->n_dhcp_server_dns > 0)
1288 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1289 else {
1290 uplink = manager_find_uplink(link->manager, link);
1291 acquired_uplink = true;
1292
1293 if (!uplink) {
1294 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1295 r = 0;
1296 } else
1297 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1298 }
1299 if (r < 0)
1300 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1301 }
1302
1303 if (link->network->dhcp_server_emit_ntp) {
1304
1305 if (link->network->n_dhcp_server_ntp > 0)
1306 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1307 else {
1308 if (!acquired_uplink)
1309 uplink = manager_find_uplink(link->manager, link);
1310
1311 if (!uplink) {
1312 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1313 r = 0;
1314 } else
1315 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1316
1317 }
1318 if (r < 0)
1319 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1320 }
1321
1322 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1323 if (r < 0)
1324 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1325
1326 if (link->network->dhcp_server_emit_timezone) {
1327 _cleanup_free_ char *buffer = NULL;
1328 const char *tz = NULL;
1329
1330 if (link->network->dhcp_server_timezone)
1331 tz = link->network->dhcp_server_timezone;
1332 else {
1333 r = get_timezone(&buffer);
1334 if (r < 0)
1335 log_warning_errno(r, "Failed to determine timezone: %m");
1336 else
1337 tz = buffer;
1338 }
1339
1340 if (tz) {
1341 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1342 if (r < 0)
1343 return r;
1344 }
1345 }
1346 if (!sd_dhcp_server_is_running(link->dhcp_server)) {
1347 r = sd_dhcp_server_start(link->dhcp_server);
1348 if (r < 0) {
1349 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1350
1351 link_enter_failed(link);
1352
1353 return 0;
1354 }
1355 }
1356
1357 log_link_debug(link, "Offering DHCPv4 leases");
1358 }
1359
1360 if (link->address_messages == 0) {
1361 link->addresses_configured = true;
1362 link_check_ready(link);
1363 } else
1364 log_link_debug(link, "Setting addresses");
1365
1366 return 0;
1367 }
1368
1369 static int link_set_bridge_vlan(Link *link) {
1370 int r = 0;
1371
1372 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1373 if (r < 0)
1374 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1375
1376 return r;
1377 }
1378
1379 static int link_set_proxy_arp(Link *link) {
1380 int r;
1381
1382 if (!link_proxy_arp_enabled(link))
1383 return 0;
1384
1385 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1386 if (r < 0)
1387 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1388
1389 return 0;
1390 }
1391
1392 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1393 int r;
1394
1395 assert(link);
1396
1397 log_link_debug(link, "Set link");
1398
1399 r = sd_netlink_message_get_errno(m);
1400 if (r < 0 && r != -EEXIST) {
1401 log_link_error_errno(link, r, "Could not join netdev: %m");
1402 link_enter_failed(link);
1403 }
1404
1405 return 1;
1406 }
1407
1408 static int link_configure_after_setting_mtu(Link *link);
1409
1410 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1411 int r;
1412
1413 assert(m);
1414 assert(link);
1415 assert(link->ifname);
1416
1417 link->setting_mtu = false;
1418
1419 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1420 return 1;
1421
1422 r = sd_netlink_message_get_errno(m);
1423 if (r < 0) {
1424 log_link_warning_errno(link, r, "Could not set MTU: %m");
1425 return 1;
1426 }
1427
1428 log_link_debug(link, "Setting MTU done.");
1429
1430 if (link->state == LINK_STATE_INITIALIZED)
1431 (void) link_configure_after_setting_mtu(link);
1432
1433 return 1;
1434 }
1435
1436 int link_set_mtu(Link *link, uint32_t mtu, bool force) {
1437 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1438 int r;
1439
1440 assert(link);
1441 assert(link->manager);
1442 assert(link->manager->rtnl);
1443
1444 if (mtu == 0 || link->setting_mtu)
1445 return 0;
1446
1447 if (force ? link->mtu == mtu : link->mtu >= mtu)
1448 return 0;
1449
1450 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1451
1452 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1453 if (r < 0)
1454 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1455
1456 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1457 * for this interface, then disable IPv6 else enable it. */
1458 (void) link_enable_ipv6(link);
1459
1460 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1461 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1462 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1463
1464 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1465 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1466
1467 mtu = IPV6_MIN_MTU;
1468 }
1469
1470 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1471 if (r < 0)
1472 return log_link_error_errno(link, r, "Could not append MTU: %m");
1473
1474 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1475 link_netlink_destroy_callback, link);
1476 if (r < 0)
1477 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1478
1479 link_ref(link);
1480 link->setting_mtu = true;
1481
1482 return 0;
1483 }
1484
1485 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1486 int r;
1487
1488 assert(m);
1489 assert(link);
1490 assert(link->ifname);
1491
1492 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1493 return 1;
1494
1495 r = sd_netlink_message_get_errno(m);
1496 if (r < 0)
1497 log_link_warning_errno(link, r, "Could not set link flags: %m");
1498
1499 return 1;
1500 }
1501
1502 static int link_set_flags(Link *link) {
1503 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1504 unsigned ifi_change = 0;
1505 unsigned ifi_flags = 0;
1506 int r;
1507
1508 assert(link);
1509 assert(link->manager);
1510 assert(link->manager->rtnl);
1511
1512 if (link->flags & IFF_LOOPBACK)
1513 return 0;
1514
1515 if (!link->network)
1516 return 0;
1517
1518 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1519 return 0;
1520
1521 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1522 if (r < 0)
1523 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1524
1525 if (link->network->arp >= 0) {
1526 ifi_change |= IFF_NOARP;
1527 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1528 }
1529
1530 if (link->network->multicast >= 0) {
1531 ifi_change |= IFF_MULTICAST;
1532 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1533 }
1534
1535 if (link->network->allmulticast >= 0) {
1536 ifi_change |= IFF_ALLMULTI;
1537 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1538 }
1539
1540 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1541 if (r < 0)
1542 return log_link_error_errno(link, r, "Could not set link flags: %m");
1543
1544 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1545 link_netlink_destroy_callback, link);
1546 if (r < 0)
1547 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1548
1549 link_ref(link);
1550
1551 return 0;
1552 }
1553
1554 static int link_set_bridge(Link *link) {
1555 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1556 int r;
1557
1558 assert(link);
1559 assert(link->network);
1560
1561 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1562 if (r < 0)
1563 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1564
1565 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1566 if (r < 0)
1567 return log_link_error_errno(link, r, "Could not set message family: %m");
1568
1569 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1570 if (r < 0)
1571 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1572
1573 if (link->network->use_bpdu >= 0) {
1574 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
1575 if (r < 0)
1576 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1577 }
1578
1579 if (link->network->hairpin >= 0) {
1580 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1581 if (r < 0)
1582 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1583 }
1584
1585 if (link->network->fast_leave >= 0) {
1586 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1587 if (r < 0)
1588 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1589 }
1590
1591 if (link->network->allow_port_to_be_root >= 0) {
1592 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
1593 if (r < 0)
1594 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1595 }
1596
1597 if (link->network->unicast_flood >= 0) {
1598 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1599 if (r < 0)
1600 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1601 }
1602
1603 if (link->network->multicast_flood >= 0) {
1604 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_FLOOD, link->network->multicast_flood);
1605 if (r < 0)
1606 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_FLOOD attribute: %m");
1607 }
1608
1609 if (link->network->multicast_to_unicast >= 0) {
1610 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_TO_UCAST, link->network->multicast_to_unicast);
1611 if (r < 0)
1612 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_TO_UCAST attribute: %m");
1613 }
1614
1615 if (link->network->neighbor_suppression >= 0) {
1616 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_NEIGH_SUPPRESS, link->network->neighbor_suppression);
1617 if (r < 0)
1618 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_NEIGH_SUPPRESS attribute: %m");
1619 }
1620
1621 if (link->network->learning >= 0) {
1622 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_LEARNING, link->network->learning);
1623 if (r < 0)
1624 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_LEARNING attribute: %m");
1625 }
1626
1627 if (link->network->bridge_proxy_arp >= 0) {
1628 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROXYARP, link->network->bridge_proxy_arp);
1629 if (r < 0)
1630 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROXYARP attribute: %m");
1631 }
1632
1633 if (link->network->bridge_proxy_arp_wifi >= 0) {
1634 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROXYARP_WIFI, link->network->bridge_proxy_arp_wifi);
1635 if (r < 0)
1636 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROXYARP_WIFI attribute: %m");
1637 }
1638
1639 if (link->network->cost != 0) {
1640 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1641 if (r < 0)
1642 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1643 }
1644
1645 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1646 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1647 if (r < 0)
1648 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1649 }
1650
1651 if (link->network->multicast_router != _MULTICAST_ROUTER_INVALID) {
1652 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MULTICAST_ROUTER, link->network->multicast_router);
1653 if (r < 0)
1654 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MULTICAST_ROUTER attribute: %m");
1655 }
1656
1657 r = sd_netlink_message_close_container(req);
1658 if (r < 0)
1659 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1660
1661 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_handler,
1662 link_netlink_destroy_callback, link);
1663 if (r < 0)
1664 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1665
1666 link_ref(link);
1667
1668 return r;
1669 }
1670
1671 static int link_set_bond_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1672 int r;
1673
1674 assert(m);
1675 assert(link);
1676 assert(link->ifname);
1677
1678 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1679 return 1;
1680
1681 r = sd_netlink_message_get_errno(m);
1682 if (r < 0) {
1683 log_link_warning_errno(link, r, "Could not set bonding interface: %m");
1684 return 1;
1685 }
1686
1687 return 1;
1688 }
1689
1690 static int link_set_bond(Link *link) {
1691 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1692 int r;
1693
1694 assert(link);
1695 assert(link->network);
1696
1697 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1698 if (r < 0)
1699 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1700
1701 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1702 if (r < 0)
1703 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1704
1705 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1706 if (r < 0)
1707 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1708
1709 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1710 if (r < 0)
1711 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1712
1713 if (link->network->active_slave) {
1714 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1715 if (r < 0)
1716 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1717 }
1718
1719 if (link->network->primary_slave) {
1720 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1721 if (r < 0)
1722 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1723 }
1724
1725 r = sd_netlink_message_close_container(req);
1726 if (r < 0)
1727 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1728
1729 r = sd_netlink_message_close_container(req);
1730 if (r < 0)
1731 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1732
1733 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_bond_handler,
1734 link_netlink_destroy_callback, link);
1735 if (r < 0)
1736 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1737
1738 link_ref(link);
1739
1740 return r;
1741 }
1742
1743 static int link_lldp_save(Link *link) {
1744 _cleanup_free_ char *temp_path = NULL;
1745 _cleanup_fclose_ FILE *f = NULL;
1746 sd_lldp_neighbor **l = NULL;
1747 int n = 0, r, i;
1748
1749 assert(link);
1750 assert(link->lldp_file);
1751
1752 if (!link->lldp) {
1753 (void) unlink(link->lldp_file);
1754 return 0;
1755 }
1756
1757 r = sd_lldp_get_neighbors(link->lldp, &l);
1758 if (r < 0)
1759 goto finish;
1760 if (r == 0) {
1761 (void) unlink(link->lldp_file);
1762 goto finish;
1763 }
1764
1765 n = r;
1766
1767 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1768 if (r < 0)
1769 goto finish;
1770
1771 fchmod(fileno(f), 0644);
1772
1773 for (i = 0; i < n; i++) {
1774 const void *p;
1775 le64_t u;
1776 size_t sz;
1777
1778 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1779 if (r < 0)
1780 goto finish;
1781
1782 u = htole64(sz);
1783 (void) fwrite(&u, 1, sizeof(u), f);
1784 (void) fwrite(p, 1, sz, f);
1785 }
1786
1787 r = fflush_and_check(f);
1788 if (r < 0)
1789 goto finish;
1790
1791 if (rename(temp_path, link->lldp_file) < 0) {
1792 r = -errno;
1793 goto finish;
1794 }
1795
1796 finish:
1797 if (r < 0) {
1798 (void) unlink(link->lldp_file);
1799 if (temp_path)
1800 (void) unlink(temp_path);
1801
1802 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1803 }
1804
1805 if (l) {
1806 for (i = 0; i < n; i++)
1807 sd_lldp_neighbor_unref(l[i]);
1808 free(l);
1809 }
1810
1811 return r;
1812 }
1813
1814 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1815 Link *link = userdata;
1816 int r;
1817
1818 assert(link);
1819
1820 (void) link_lldp_save(link);
1821
1822 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1823 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1824
1825 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1826
1827 r = link_lldp_emit_start(link);
1828 if (r < 0)
1829 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1830 }
1831 }
1832
1833 static int link_acquire_ipv6_conf(Link *link) {
1834 int r;
1835
1836 assert(link);
1837
1838 if (link_ipv6_accept_ra_enabled(link)) {
1839 assert(link->ndisc);
1840
1841 log_link_debug(link, "Discovering IPv6 routers");
1842
1843 r = sd_ndisc_start(link->ndisc);
1844 if (r < 0 && r != -EBUSY)
1845 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1846 }
1847
1848 if (link_radv_enabled(link)) {
1849 assert(link->radv);
1850 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1851
1852 log_link_debug(link, "Starting IPv6 Router Advertisements");
1853
1854 r = sd_radv_start(link->radv);
1855 if (r < 0 && r != -EBUSY)
1856 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1857 }
1858
1859 (void) dhcp6_request_prefix_delegation(link);
1860
1861 return 0;
1862 }
1863
1864 static int link_acquire_ipv4_conf(Link *link) {
1865 int r;
1866
1867 assert(link);
1868 assert(link->manager);
1869 assert(link->manager->event);
1870
1871 if (link_ipv4ll_enabled(link)) {
1872 assert(link->ipv4ll);
1873
1874 log_link_debug(link, "Acquiring IPv4 link-local address");
1875
1876 r = sd_ipv4ll_start(link->ipv4ll);
1877 if (r < 0)
1878 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1879 }
1880
1881 if (link_dhcp4_enabled(link)) {
1882 assert(link->dhcp_client);
1883
1884 log_link_debug(link, "Acquiring DHCPv4 lease");
1885
1886 r = sd_dhcp_client_start(link->dhcp_client);
1887 if (r < 0)
1888 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1889 }
1890
1891 return 0;
1892 }
1893
1894 static int link_acquire_conf(Link *link) {
1895 int r;
1896
1897 assert(link);
1898
1899 r = link_acquire_ipv4_conf(link);
1900 if (r < 0)
1901 return r;
1902
1903 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1904 r = link_acquire_ipv6_conf(link);
1905 if (r < 0)
1906 return r;
1907 }
1908
1909 if (link_lldp_emit_enabled(link)) {
1910 r = link_lldp_emit_start(link);
1911 if (r < 0)
1912 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1913 }
1914
1915 return 0;
1916 }
1917
1918 bool link_has_carrier(Link *link) {
1919 /* see Documentation/networking/operstates.txt in the kernel sources */
1920
1921 if (link->kernel_operstate == IF_OPER_UP)
1922 return true;
1923
1924 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1925 /* operstate may not be implemented, so fall back to flags */
1926 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1927 return true;
1928
1929 return false;
1930 }
1931
1932 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1933 int r;
1934
1935 assert(link);
1936
1937 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1938 return 1;
1939
1940 r = sd_netlink_message_get_errno(m);
1941 if (r < 0)
1942 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1943
1944 return 1;
1945 }
1946
1947 static int link_configure_addrgen_mode(Link *link) {
1948 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1949 uint8_t ipv6ll_mode;
1950 int r;
1951
1952 assert(link);
1953 assert(link->network);
1954 assert(link->manager);
1955 assert(link->manager->rtnl);
1956
1957 log_link_debug(link, "Setting address genmode for link");
1958
1959 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1960 if (r < 0)
1961 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1962
1963 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1964 if (r < 0)
1965 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1966
1967 r = sd_netlink_message_open_container(req, AF_INET6);
1968 if (r < 0)
1969 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1970
1971 if (!link_ipv6ll_enabled(link))
1972 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1973 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1974 /* The file may not exist. And event if it exists, when stable_secret is unset,
1975 * reading the file fails with EIO. */
1976 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1977 else
1978 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1979
1980 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1981 if (r < 0)
1982 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1983
1984 r = sd_netlink_message_close_container(req);
1985 if (r < 0)
1986 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1987
1988 r = sd_netlink_message_close_container(req);
1989 if (r < 0)
1990 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1991
1992 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1993 link_netlink_destroy_callback, link);
1994 if (r < 0)
1995 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1996
1997 link_ref(link);
1998
1999 return 0;
2000 }
2001
2002 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2003 int r;
2004
2005 assert(link);
2006
2007 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2008 return 1;
2009
2010 r = sd_netlink_message_get_errno(m);
2011 if (r < 0)
2012 /* we warn but don't fail the link, as it may be brought up later */
2013 log_link_warning_errno(link, r, "Could not bring up interface: %m");
2014
2015 return 1;
2016 }
2017
2018 static int link_up(Link *link) {
2019 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2020 int r;
2021
2022 assert(link);
2023 assert(link->network);
2024 assert(link->manager);
2025 assert(link->manager->rtnl);
2026
2027 log_link_debug(link, "Bringing link up");
2028
2029 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2030 if (r < 0)
2031 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2032
2033 /* set it free if not enslaved with networkd */
2034 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
2035 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
2036 if (r < 0)
2037 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
2038 }
2039
2040 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
2041 if (r < 0)
2042 return log_link_error_errno(link, r, "Could not set link flags: %m");
2043
2044 if (link->network->mac) {
2045 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
2046 if (r < 0)
2047 return log_link_error_errno(link, r, "Could not set MAC address: %m");
2048 }
2049
2050 if (link_ipv6_enabled(link)) {
2051 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
2052 if (r < 0)
2053 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
2054
2055 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
2056 r = sd_netlink_message_open_container(req, AF_INET6);
2057 if (r < 0)
2058 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
2059
2060 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
2061 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
2062 if (r < 0)
2063 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
2064 }
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 log_link_debug(link, "Started LLDP.");
3032 } else {
3033 r = sd_lldp_stop(link->lldp);
3034 if (r > 0)
3035 log_link_debug(link, "Stopped LLDP.");
3036 }
3037
3038 return r;
3039 }
3040
3041 static int link_configure_can(Link *link) {
3042 int r;
3043
3044 if (streq_ptr(link->kind, "can")) {
3045 /* The CAN interface must be down to configure bitrate, etc... */
3046 if ((link->flags & IFF_UP)) {
3047 r = link_down(link);
3048 if (r < 0) {
3049 link_enter_failed(link);
3050 return r;
3051 }
3052
3053 return 0;
3054 }
3055
3056 return link_set_can(link);
3057 }
3058
3059 if (!(link->flags & IFF_UP)) {
3060 r = link_up_can(link);
3061 if (r < 0) {
3062 link_enter_failed(link);
3063 return r;
3064 }
3065 }
3066
3067 return 0;
3068 }
3069
3070 static int link_configure(Link *link) {
3071 int r;
3072
3073 assert(link);
3074 assert(link->network);
3075 assert(link->state == LINK_STATE_INITIALIZED);
3076
3077 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
3078 return link_configure_can(link);
3079
3080 /* Drop foreign config, but ignore loopback or critical devices.
3081 * We do not want to remove loopback address or addresses used for root NFS. */
3082 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
3083 r = link_drop_foreign_config(link);
3084 if (r < 0)
3085 return r;
3086 }
3087
3088 r = link_set_proxy_arp(link);
3089 if (r < 0)
3090 return r;
3091
3092 r = ipv6_proxy_ndp_addresses_configure(link);
3093 if (r < 0)
3094 return r;
3095
3096 r = link_set_ipv4_forward(link);
3097 if (r < 0)
3098 return r;
3099
3100 r = link_set_ipv6_forward(link);
3101 if (r < 0)
3102 return r;
3103
3104 r = link_set_ipv6_privacy_extensions(link);
3105 if (r < 0)
3106 return r;
3107
3108 r = link_set_ipv6_accept_ra(link);
3109 if (r < 0)
3110 return r;
3111
3112 r = link_set_ipv6_dad_transmits(link);
3113 if (r < 0)
3114 return r;
3115
3116 r = link_set_ipv6_hop_limit(link);
3117 if (r < 0)
3118 return r;
3119
3120 r = link_set_flags(link);
3121 if (r < 0)
3122 return r;
3123
3124 r = link_set_ipv6_mtu(link);
3125 if (r < 0)
3126 return r;
3127
3128 if (link_ipv4ll_enabled(link) || link_ipv4ll_fallback_enabled(link)) {
3129 r = ipv4ll_configure(link);
3130 if (r < 0)
3131 return r;
3132 }
3133
3134 if (link_dhcp4_enabled(link)) {
3135 r = dhcp4_set_promote_secondaries(link);
3136 if (r < 0)
3137 return r;
3138
3139 r = dhcp4_configure(link);
3140 if (r < 0)
3141 return r;
3142 }
3143
3144 if (link_dhcp4_server_enabled(link)) {
3145 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
3146 if (r < 0)
3147 return r;
3148
3149 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
3150 if (r < 0)
3151 return r;
3152 }
3153
3154 if (link_dhcp6_enabled(link) ||
3155 link_ipv6_accept_ra_enabled(link)) {
3156 r = dhcp6_configure(link);
3157 if (r < 0)
3158 return r;
3159 }
3160
3161 if (link_ipv6_accept_ra_enabled(link)) {
3162 r = ndisc_configure(link);
3163 if (r < 0)
3164 return r;
3165 }
3166
3167 if (link_radv_enabled(link)) {
3168 r = radv_configure(link);
3169 if (r < 0)
3170 return r;
3171 }
3172
3173 if (link_lldp_rx_enabled(link)) {
3174 r = sd_lldp_new(&link->lldp);
3175 if (r < 0)
3176 return r;
3177
3178 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
3179 if (r < 0)
3180 return r;
3181
3182 r = sd_lldp_match_capabilities(link->lldp,
3183 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
3184 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
3185 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
3186 if (r < 0)
3187 return r;
3188
3189 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
3190 if (r < 0)
3191 return r;
3192
3193 r = sd_lldp_attach_event(link->lldp, NULL, 0);
3194 if (r < 0)
3195 return r;
3196
3197 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
3198 if (r < 0)
3199 return r;
3200
3201 r = link_update_lldp(link);
3202 if (r < 0)
3203 return r;
3204 }
3205
3206 r = link_set_mtu(link, link->network->mtu, link->network->mtu_is_set);
3207 if (r < 0)
3208 return r;
3209
3210 if (socket_ipv6_is_supported()) {
3211 r = link_configure_addrgen_mode(link);
3212 if (r < 0)
3213 return r;
3214 }
3215
3216 return link_configure_after_setting_mtu(link);
3217 }
3218
3219 static int link_configure_after_setting_mtu(Link *link) {
3220 int r;
3221
3222 assert(link);
3223 assert(link->network);
3224 assert(link->state == LINK_STATE_INITIALIZED);
3225
3226 if (link->setting_mtu)
3227 return 0;
3228
3229 if (link_has_carrier(link) || link->network->configure_without_carrier) {
3230 r = link_acquire_conf(link);
3231 if (r < 0)
3232 return r;
3233 }
3234
3235 return link_enter_join_netdev(link);
3236 }
3237
3238 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3239 assert(duid);
3240
3241 if (duid->raw_data_len > 0)
3242 return 0;
3243
3244 if (duid->type != DUID_TYPE_UUID)
3245 return -EINVAL;
3246
3247 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3248 duid->raw_data_len = sizeof(sd_id128_t);
3249
3250 return 1;
3251 }
3252
3253 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3254 Manager *manager = userdata;
3255 const sd_bus_error *e;
3256 const void *a;
3257 size_t sz;
3258 DUID *duid;
3259 Link *link;
3260 int r;
3261
3262 assert(m);
3263 assert(manager);
3264
3265 e = sd_bus_message_get_error(m);
3266 if (e) {
3267 log_error_errno(sd_bus_error_get_errno(e),
3268 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3269 e->message);
3270 goto configure;
3271 }
3272
3273 r = sd_bus_message_read_array(m, 'y', &a, &sz);
3274 if (r < 0)
3275 goto configure;
3276
3277 if (sz != sizeof(sd_id128_t)) {
3278 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3279 goto configure;
3280 }
3281
3282 memcpy(&manager->product_uuid, a, sz);
3283 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3284 (void) duid_set_uuid(duid, manager->product_uuid);
3285
3286 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3287
3288 configure:
3289 while ((link = set_steal_first(manager->links_requesting_uuid))) {
3290 r = link_configure(link);
3291 if (r < 0)
3292 log_link_error_errno(link, r, "Failed to configure link: %m");
3293 }
3294
3295 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3296
3297 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3298 * even if the method fails. */
3299 manager->has_product_uuid = true;
3300
3301 return 1;
3302 }
3303
3304 static bool link_requires_uuid(Link *link) {
3305 const DUID *duid;
3306
3307 assert(link);
3308 assert(link->manager);
3309 assert(link->network);
3310
3311 duid = link_get_duid(link);
3312 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3313 return false;
3314
3315 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3316 return true;
3317
3318 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3319 return true;
3320
3321 return false;
3322 }
3323
3324 static int link_configure_duid(Link *link) {
3325 Manager *m;
3326 DUID *duid;
3327 int r;
3328
3329 assert(link);
3330 assert(link->manager);
3331 assert(link->network);
3332
3333 m = link->manager;
3334 duid = link_get_duid(link);
3335
3336 if (!link_requires_uuid(link))
3337 return 1;
3338
3339 if (m->has_product_uuid) {
3340 (void) duid_set_uuid(duid, m->product_uuid);
3341 return 1;
3342 }
3343
3344 if (!m->links_requesting_uuid) {
3345 r = manager_request_product_uuid(m, link);
3346 if (r < 0) {
3347 if (r == -ENOMEM)
3348 return r;
3349
3350 log_link_warning_errno(link, r,
3351 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3352 return 1;
3353 }
3354 } else {
3355 r = set_put(m->links_requesting_uuid, link);
3356 if (r < 0)
3357 return log_oom();
3358
3359 r = set_put(m->duids_requesting_uuid, duid);
3360 if (r < 0)
3361 return log_oom();
3362 }
3363
3364 return 0;
3365 }
3366
3367 static int link_initialized_and_synced(Link *link) {
3368 Network *network;
3369 int r;
3370
3371 assert(link);
3372 assert(link->ifname);
3373 assert(link->manager);
3374
3375 /* We may get called either from the asynchronous netlink callback,
3376 * or directly for link_add() if running in a container. See link_add(). */
3377 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3378 return 0;
3379
3380 log_link_debug(link, "Link state is up-to-date");
3381 link_set_state(link, LINK_STATE_INITIALIZED);
3382
3383 r = link_new_bound_by_list(link);
3384 if (r < 0)
3385 return r;
3386
3387 r = link_handle_bound_by_list(link);
3388 if (r < 0)
3389 return r;
3390
3391 if (!link->network) {
3392 r = network_get(link->manager, link->sd_device, link->ifname,
3393 &link->mac, &network);
3394 if (r == -ENOENT) {
3395 link_enter_unmanaged(link);
3396 return 0;
3397 } else if (r == 0 && network->unmanaged) {
3398 link_enter_unmanaged(link);
3399 return 0;
3400 } else if (r < 0)
3401 return r;
3402
3403 if (link->flags & IFF_LOOPBACK) {
3404 if (network->link_local != ADDRESS_FAMILY_NO)
3405 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3406
3407 if (network->dhcp != ADDRESS_FAMILY_NO)
3408 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3409
3410 if (network->dhcp_server)
3411 log_link_debug(link, "Ignoring DHCP server for loopback link");
3412 }
3413
3414 r = network_apply(network, link);
3415 if (r < 0)
3416 return r;
3417 }
3418
3419 r = link_new_bound_to_list(link);
3420 if (r < 0)
3421 return r;
3422
3423 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3424 * link_configure() is called later asynchronously. */
3425 r = link_configure_duid(link);
3426 if (r <= 0)
3427 return r;
3428
3429 r = link_configure(link);
3430 if (r < 0)
3431 return r;
3432
3433 return 0;
3434 }
3435
3436 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3437 (void) link_initialized_and_synced(link);
3438 return 1;
3439 }
3440
3441 int link_initialized(Link *link, sd_device *device) {
3442 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3443 int r;
3444
3445 assert(link);
3446 assert(link->manager);
3447 assert(link->manager->rtnl);
3448 assert(device);
3449
3450 if (link->state != LINK_STATE_PENDING)
3451 return 0;
3452
3453 if (link->sd_device)
3454 return 0;
3455
3456 log_link_debug(link, "udev initialized link");
3457 link_set_state(link, LINK_STATE_INITIALIZED);
3458
3459 link->sd_device = sd_device_ref(device);
3460
3461 /* udev has initialized the link, but we don't know if we have yet
3462 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3463 * when it returns we know that the pending NEWLINKs have already been
3464 * processed and that we are up-to-date */
3465
3466 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3467 link->ifindex);
3468 if (r < 0)
3469 return r;
3470
3471 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3472 link_netlink_destroy_callback, link);
3473 if (r < 0)
3474 return r;
3475
3476 link_ref(link);
3477
3478 return 0;
3479 }
3480
3481 static int link_load(Link *link) {
3482 _cleanup_free_ char *network_file = NULL,
3483 *addresses = NULL,
3484 *routes = NULL,
3485 *dhcp4_address = NULL,
3486 *ipv4ll_address = NULL;
3487 union in_addr_union address;
3488 union in_addr_union route_dst;
3489 const char *p;
3490 int r;
3491
3492 assert(link);
3493
3494 r = parse_env_file(NULL, link->state_file,
3495 "NETWORK_FILE", &network_file,
3496 "ADDRESSES", &addresses,
3497 "ROUTES", &routes,
3498 "DHCP4_ADDRESS", &dhcp4_address,
3499 "IPV4LL_ADDRESS", &ipv4ll_address);
3500 if (r < 0 && r != -ENOENT)
3501 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3502
3503 if (network_file) {
3504 Network *network;
3505 char *suffix;
3506
3507 /* drop suffix */
3508 suffix = strrchr(network_file, '.');
3509 if (!suffix) {
3510 log_link_debug(link, "Failed to get network name from %s", network_file);
3511 goto network_file_fail;
3512 }
3513 *suffix = '\0';
3514
3515 r = network_get_by_name(link->manager, basename(network_file), &network);
3516 if (r < 0) {
3517 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3518 goto network_file_fail;
3519 }
3520
3521 r = network_apply(network, link);
3522 if (r < 0)
3523 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3524 }
3525
3526 network_file_fail:
3527
3528 if (addresses) {
3529 p = addresses;
3530
3531 for (;;) {
3532 _cleanup_free_ char *address_str = NULL;
3533 char *prefixlen_str;
3534 int family;
3535 unsigned char prefixlen;
3536
3537 r = extract_first_word(&p, &address_str, NULL, 0);
3538 if (r < 0) {
3539 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3540 continue;
3541 }
3542 if (r == 0)
3543 break;
3544
3545 prefixlen_str = strchr(address_str, '/');
3546 if (!prefixlen_str) {
3547 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3548 continue;
3549 }
3550
3551 *prefixlen_str++ = '\0';
3552
3553 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3554 if (r != 1) {
3555 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3556 continue;
3557 }
3558
3559 r = in_addr_from_string_auto(address_str, &family, &address);
3560 if (r < 0) {
3561 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3562 continue;
3563 }
3564
3565 r = address_add(link, family, &address, prefixlen, NULL);
3566 if (r < 0)
3567 return log_link_error_errno(link, r, "Failed to add address: %m");
3568 }
3569 }
3570
3571 if (routes) {
3572 p = routes;
3573
3574 for (;;) {
3575 Route *route;
3576 _cleanup_free_ char *route_str = NULL;
3577 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3578 usec_t lifetime;
3579 char *prefixlen_str;
3580 int family;
3581 unsigned char prefixlen, tos, table;
3582 uint32_t priority;
3583
3584 r = extract_first_word(&p, &route_str, NULL, 0);
3585 if (r < 0) {
3586 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3587 continue;
3588 }
3589 if (r == 0)
3590 break;
3591
3592 prefixlen_str = strchr(route_str, '/');
3593 if (!prefixlen_str) {
3594 log_link_debug(link, "Failed to parse route %s", route_str);
3595 continue;
3596 }
3597
3598 *prefixlen_str++ = '\0';
3599
3600 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3601 if (r != 5) {
3602 log_link_debug(link,
3603 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3604 prefixlen_str);
3605 continue;
3606 }
3607
3608 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3609 if (r < 0) {
3610 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3611 continue;
3612 }
3613
3614 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3615 if (r < 0)
3616 return log_link_error_errno(link, r, "Failed to add route: %m");
3617
3618 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3619 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3620 0, route_expire_handler, route);
3621 if (r < 0)
3622 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3623 }
3624
3625 route->lifetime = lifetime;
3626 sd_event_source_unref(route->expire);
3627 route->expire = TAKE_PTR(expire);
3628 }
3629 }
3630
3631 if (dhcp4_address) {
3632 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3633 if (r < 0) {
3634 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3635 goto dhcp4_address_fail;
3636 }
3637
3638 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3639 if (r < 0)
3640 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3641
3642 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3643 if (r < 0)
3644 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3645 }
3646
3647 dhcp4_address_fail:
3648
3649 if (ipv4ll_address) {
3650 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3651 if (r < 0) {
3652 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3653 goto ipv4ll_address_fail;
3654 }
3655
3656 r = sd_ipv4ll_new(&link->ipv4ll);
3657 if (r < 0)
3658 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3659
3660 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3661 if (r < 0)
3662 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3663 }
3664
3665 ipv4ll_address_fail:
3666
3667 return 0;
3668 }
3669
3670 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3671 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3672 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3673 Link *link;
3674 int r;
3675
3676 assert(m);
3677 assert(m->rtnl);
3678 assert(message);
3679 assert(ret);
3680
3681 r = link_new(m, message, ret);
3682 if (r < 0)
3683 return r;
3684
3685 link = *ret;
3686
3687 log_link_debug(link, "Link %d added", link->ifindex);
3688
3689 r = link_load(link);
3690 if (r < 0)
3691 return r;
3692
3693 if (detect_container() <= 0) {
3694 /* not in a container, udev will be around */
3695 sprintf(ifindex_str, "n%d", link->ifindex);
3696 r = sd_device_new_from_device_id(&device, ifindex_str);
3697 if (r < 0) {
3698 log_link_warning_errno(link, r, "Could not find device: %m");
3699 goto failed;
3700 }
3701
3702 r = sd_device_get_is_initialized(device);
3703 if (r < 0) {
3704 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3705 goto failed;
3706 }
3707 if (r == 0) {
3708 /* not yet ready */
3709 log_link_debug(link, "link pending udev initialization...");
3710 return 0;
3711 }
3712
3713 r = device_is_renaming(device);
3714 if (r < 0) {
3715 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3716 goto failed;
3717 }
3718 if (r > 0) {
3719 log_link_debug(link, "Interface is under renaming, pending initialization.");
3720 return 0;
3721 }
3722
3723 r = link_initialized(link, device);
3724 if (r < 0)
3725 goto failed;
3726 } else {
3727 r = link_initialized_and_synced(link);
3728 if (r < 0)
3729 goto failed;
3730 }
3731
3732 return 0;
3733 failed:
3734 link_enter_failed(link);
3735 return r;
3736 }
3737
3738 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3739 int r;
3740
3741 assert(link);
3742
3743 log_link_info(link, "Gained IPv6LL");
3744
3745 link->ipv6ll_address = *address;
3746 link_check_ready(link);
3747
3748 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3749 r = link_acquire_ipv6_conf(link);
3750 if (r < 0) {
3751 link_enter_failed(link);
3752 return r;
3753 }
3754 }
3755
3756 return 0;
3757 }
3758
3759 static int link_carrier_gained(Link *link) {
3760 int r;
3761
3762 assert(link);
3763
3764 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3765 r = link_acquire_conf(link);
3766 if (r < 0) {
3767 link_enter_failed(link);
3768 return r;
3769 }
3770
3771 r = link_request_set_addresses(link);
3772 if (r < 0)
3773 return r;
3774 }
3775
3776 r = link_handle_bound_by_list(link);
3777 if (r < 0)
3778 return r;
3779
3780 return 0;
3781 }
3782
3783 static int link_carrier_lost(Link *link) {
3784 int r;
3785
3786 assert(link);
3787
3788 if (link->network && link->network->ignore_carrier_loss)
3789 return 0;
3790
3791 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3792 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3793 * configuration and stop the clients as well. */
3794 if (link->setting_mtu)
3795 return 0;
3796
3797 r = link_stop_clients(link);
3798 if (r < 0) {
3799 link_enter_failed(link);
3800 return r;
3801 }
3802
3803 if (link_dhcp4_server_enabled(link))
3804 (void) sd_dhcp_server_stop(link->dhcp_server);
3805
3806 r = link_drop_config(link);
3807 if (r < 0)
3808 return r;
3809
3810 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3811 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3812 r = link_drop_foreign_config(link);
3813 if (r < 0)
3814 return r;
3815 }
3816
3817 r = link_handle_bound_by_list(link);
3818 if (r < 0)
3819 return r;
3820
3821 return 0;
3822 }
3823
3824 int link_carrier_reset(Link *link) {
3825 int r;
3826
3827 assert(link);
3828
3829 if (link_has_carrier(link)) {
3830 r = link_carrier_lost(link);
3831 if (r < 0)
3832 return r;
3833
3834 r = link_carrier_gained(link);
3835 if (r < 0)
3836 return r;
3837
3838 log_link_info(link, "Reset carrier");
3839 }
3840
3841 return 0;
3842 }
3843
3844 int link_update(Link *link, sd_netlink_message *m) {
3845 struct ether_addr mac;
3846 const char *ifname;
3847 uint32_t mtu;
3848 bool had_carrier, carrier_gained, carrier_lost;
3849 int r;
3850
3851 assert(link);
3852 assert(link->ifname);
3853 assert(m);
3854
3855 if (link->state == LINK_STATE_LINGER) {
3856 log_link_info(link, "Link re-added");
3857 link_set_state(link, LINK_STATE_CONFIGURING);
3858
3859 r = link_new_carrier_maps(link);
3860 if (r < 0)
3861 return r;
3862 }
3863
3864 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3865 if (r >= 0 && !streq(ifname, link->ifname)) {
3866 Manager *manager = link->manager;
3867
3868 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3869
3870 link_drop(link);
3871 r = link_add(manager, m, &link);
3872 if (r < 0)
3873 return r;
3874 }
3875
3876 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3877 if (r >= 0 && mtu > 0) {
3878 link->mtu = mtu;
3879 if (link->original_mtu == 0) {
3880 link->original_mtu = mtu;
3881 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3882 }
3883
3884 if (link->dhcp_client) {
3885 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3886 link->mtu);
3887 if (r < 0)
3888 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3889 }
3890
3891 if (link->radv) {
3892 r = sd_radv_set_mtu(link->radv, link->mtu);
3893 if (r < 0)
3894 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3895 }
3896 }
3897
3898 /* The kernel may broadcast NEWLINK messages without the MAC address
3899 set, simply ignore them. */
3900 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3901 if (r >= 0) {
3902 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3903 ETH_ALEN)) {
3904
3905 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3906 ETH_ALEN);
3907
3908 log_link_debug(link, "MAC address: "
3909 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3910 mac.ether_addr_octet[0],
3911 mac.ether_addr_octet[1],
3912 mac.ether_addr_octet[2],
3913 mac.ether_addr_octet[3],
3914 mac.ether_addr_octet[4],
3915 mac.ether_addr_octet[5]);
3916
3917 if (link->ipv4ll) {
3918 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3919 if (r < 0)
3920 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3921 }
3922
3923 if (link->dhcp_client) {
3924 r = sd_dhcp_client_set_mac(link->dhcp_client,
3925 (const uint8_t *) &link->mac,
3926 sizeof (link->mac),
3927 ARPHRD_ETHER);
3928 if (r < 0)
3929 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3930
3931 r = dhcp4_set_client_identifier(link);
3932 if (r < 0)
3933 return r;
3934 }
3935
3936 if (link->dhcp6_client) {
3937 const DUID* duid = link_get_duid(link);
3938
3939 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3940 (const uint8_t *) &link->mac,
3941 sizeof (link->mac),
3942 ARPHRD_ETHER);
3943 if (r < 0)
3944 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3945
3946 if (link->network->iaid_set) {
3947 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3948 link->network->iaid);
3949 if (r < 0)
3950 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3951 }
3952
3953 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3954 duid->type,
3955 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3956 duid->raw_data_len);
3957 if (r < 0)
3958 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3959 }
3960
3961 if (link->radv) {
3962 r = sd_radv_set_mac(link->radv, &link->mac);
3963 if (r < 0)
3964 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3965 }
3966
3967 if (link->ndisc) {
3968 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3969 if (r < 0)
3970 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3971 }
3972 }
3973 }
3974
3975 had_carrier = link_has_carrier(link);
3976
3977 r = link_update_flags(link, m);
3978 if (r < 0)
3979 return r;
3980
3981 r = link_update_lldp(link);
3982 if (r < 0)
3983 return r;
3984
3985 carrier_gained = !had_carrier && link_has_carrier(link);
3986 carrier_lost = had_carrier && !link_has_carrier(link);
3987
3988 if (carrier_gained) {
3989 log_link_info(link, "Gained carrier");
3990
3991 r = link_carrier_gained(link);
3992 if (r < 0)
3993 return r;
3994 } else if (carrier_lost) {
3995 log_link_info(link, "Lost carrier");
3996
3997 r = link_carrier_lost(link);
3998 if (r < 0)
3999 return r;
4000 }
4001
4002 return 0;
4003 }
4004
4005 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
4006 bool space = false;
4007 Iterator i;
4008 Link *link;
4009
4010 assert(f);
4011 assert(prefix);
4012
4013 if (hashmap_isempty(h))
4014 return;
4015
4016 fputs(prefix, f);
4017 HASHMAP_FOREACH(link, h, i) {
4018 if (space)
4019 fputc(' ', f);
4020
4021 fprintf(f, "%i", link->ifindex);
4022 space = true;
4023 }
4024
4025 fputc('\n', f);
4026 }
4027
4028 int link_save(Link *link) {
4029 _cleanup_free_ char *temp_path = NULL;
4030 _cleanup_fclose_ FILE *f = NULL;
4031 const char *admin_state, *oper_state;
4032 Address *a;
4033 Route *route;
4034 Iterator i;
4035 int r;
4036
4037 assert(link);
4038 assert(link->state_file);
4039 assert(link->lease_file);
4040 assert(link->manager);
4041
4042 if (link->state == LINK_STATE_LINGER) {
4043 (void) unlink(link->state_file);
4044 return 0;
4045 }
4046
4047 link_lldp_save(link);
4048
4049 admin_state = link_state_to_string(link->state);
4050 assert(admin_state);
4051
4052 oper_state = link_operstate_to_string(link->operstate);
4053 assert(oper_state);
4054
4055 r = fopen_temporary(link->state_file, &f, &temp_path);
4056 if (r < 0)
4057 goto fail;
4058
4059 (void) fchmod(fileno(f), 0644);
4060
4061 fprintf(f,
4062 "# This is private data. Do not parse.\n"
4063 "ADMIN_STATE=%s\n"
4064 "OPER_STATE=%s\n",
4065 admin_state, oper_state);
4066
4067 if (link->network) {
4068 bool space;
4069 sd_dhcp6_lease *dhcp6_lease = NULL;
4070 const char *dhcp_domainname = NULL;
4071 char **dhcp6_domains = NULL;
4072 char **dhcp_domains = NULL;
4073 unsigned j;
4074
4075 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4076 yes_no(link->network->required_for_online));
4077
4078 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
4079 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
4080
4081 if (link->dhcp6_client) {
4082 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
4083 if (r < 0 && r != -ENOMSG)
4084 log_link_debug(link, "No DHCPv6 lease");
4085 }
4086
4087 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4088
4089 fputs("DNS=", f);
4090 space = false;
4091
4092 for (j = 0; j < link->network->n_dns; j++) {
4093 _cleanup_free_ char *b = NULL;
4094
4095 r = in_addr_to_string(link->network->dns[j].family,
4096 &link->network->dns[j].address, &b);
4097 if (r < 0) {
4098 log_debug_errno(r, "Failed to format address, ignoring: %m");
4099 continue;
4100 }
4101
4102 if (space)
4103 fputc(' ', f);
4104 fputs(b, f);
4105 space = true;
4106 }
4107
4108 if (link->network->dhcp_use_dns &&
4109 link->dhcp_lease) {
4110 const struct in_addr *addresses;
4111
4112 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
4113 if (r > 0)
4114 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4115 space = true;
4116 }
4117
4118 if (link->network->dhcp_use_dns && dhcp6_lease) {
4119 struct in6_addr *in6_addrs;
4120
4121 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
4122 if (r > 0) {
4123 if (space)
4124 fputc(' ', f);
4125 serialize_in6_addrs(f, in6_addrs, r);
4126 space = true;
4127 }
4128 }
4129
4130 /* Make sure to flush out old entries before we use the NDISC data */
4131 ndisc_vacuum(link);
4132
4133 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4134 NDiscRDNSS *dd;
4135
4136 SET_FOREACH(dd, link->ndisc_rdnss, i) {
4137 if (space)
4138 fputc(' ', f);
4139
4140 serialize_in6_addrs(f, &dd->address, 1);
4141 space = true;
4142 }
4143 }
4144
4145 fputc('\n', f);
4146
4147 fputs("NTP=", f);
4148 space = false;
4149 fputstrv(f, link->network->ntp, NULL, &space);
4150
4151 if (link->network->dhcp_use_ntp &&
4152 link->dhcp_lease) {
4153 const struct in_addr *addresses;
4154
4155 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
4156 if (r > 0)
4157 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4158 space = true;
4159 }
4160
4161 if (link->network->dhcp_use_ntp && dhcp6_lease) {
4162 struct in6_addr *in6_addrs;
4163 char **hosts;
4164
4165 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
4166 &in6_addrs);
4167 if (r > 0) {
4168 if (space)
4169 fputc(' ', f);
4170 serialize_in6_addrs(f, in6_addrs, r);
4171 space = true;
4172 }
4173
4174 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
4175 if (r > 0)
4176 fputstrv(f, hosts, NULL, &space);
4177 }
4178
4179 fputc('\n', f);
4180
4181 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4182 if (link->dhcp_lease) {
4183 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4184 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4185 }
4186 if (dhcp6_lease)
4187 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4188 }
4189
4190 ordered_set_print(f, "DOMAINS=", link->network->search_domains);
4191
4192 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4193 NDiscDNSSL *dd;
4194
4195 if (dhcp_domainname)
4196 fputs_with_space(f, dhcp_domainname, NULL, &space);
4197 if (dhcp_domains)
4198 fputstrv(f, dhcp_domains, NULL, &space);
4199 if (dhcp6_domains)
4200 fputstrv(f, dhcp6_domains, NULL, &space);
4201
4202 SET_FOREACH(dd, link->ndisc_dnssl, i)
4203 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4204 }
4205
4206 fputc('\n', f);
4207
4208 ordered_set_print(f, "ROUTE_DOMAINS=", link->network->route_domains);
4209
4210 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4211 NDiscDNSSL *dd;
4212
4213 if (dhcp_domainname)
4214 fputs_with_space(f, dhcp_domainname, NULL, &space);
4215 if (dhcp_domains)
4216 fputstrv(f, dhcp_domains, NULL, &space);
4217 if (dhcp6_domains)
4218 fputstrv(f, dhcp6_domains, NULL, &space);
4219
4220 SET_FOREACH(dd, link->ndisc_dnssl, i)
4221 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4222 }
4223
4224 fputc('\n', f);
4225
4226 fprintf(f, "LLMNR=%s\n",
4227 resolve_support_to_string(link->network->llmnr));
4228 fprintf(f, "MDNS=%s\n",
4229 resolve_support_to_string(link->network->mdns));
4230 if (link->network->dns_default_route >= 0)
4231 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
4232
4233 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4234 fprintf(f, "DNS_OVER_TLS=%s\n",
4235 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
4236
4237 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
4238 fprintf(f, "DNSSEC=%s\n",
4239 dnssec_mode_to_string(link->network->dnssec_mode));
4240
4241 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
4242 const char *n;
4243
4244 fputs("DNSSEC_NTA=", f);
4245 space = false;
4246 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
4247 fputs_with_space(f, n, NULL, &space);
4248 fputc('\n', f);
4249 }
4250
4251 fputs("ADDRESSES=", f);
4252 space = false;
4253 SET_FOREACH(a, link->addresses, i) {
4254 _cleanup_free_ char *address_str = NULL;
4255
4256 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4257 if (r < 0)
4258 goto fail;
4259
4260 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4261 space = true;
4262 }
4263 fputc('\n', f);
4264
4265 fputs("ROUTES=", f);
4266 space = false;
4267 SET_FOREACH(route, link->routes, i) {
4268 _cleanup_free_ char *route_str = NULL;
4269
4270 r = in_addr_to_string(route->family, &route->dst, &route_str);
4271 if (r < 0)
4272 goto fail;
4273
4274 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4275 space ? " " : "", route_str,
4276 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4277 space = true;
4278 }
4279
4280 fputc('\n', f);
4281 }
4282
4283 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4284 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4285
4286 if (link->dhcp_lease) {
4287 struct in_addr address;
4288 const char *tz = NULL;
4289
4290 assert(link->network);
4291
4292 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
4293 if (r >= 0)
4294 fprintf(f, "TIMEZONE=%s\n", tz);
4295
4296 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
4297 if (r >= 0) {
4298 fputs("DHCP4_ADDRESS=", f);
4299 serialize_in_addrs(f, &address, 1, false, NULL);
4300 fputc('\n', f);
4301 }
4302
4303 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4304 if (r < 0)
4305 goto fail;
4306
4307 fprintf(f,
4308 "DHCP_LEASE=%s\n",
4309 link->lease_file);
4310 } else
4311 (void) unlink(link->lease_file);
4312
4313 if (link->ipv4ll) {
4314 struct in_addr address;
4315
4316 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4317 if (r >= 0) {
4318 fputs("IPV4LL_ADDRESS=", f);
4319 serialize_in_addrs(f, &address, 1, false, NULL);
4320 fputc('\n', f);
4321 }
4322 }
4323
4324 r = fflush_and_check(f);
4325 if (r < 0)
4326 goto fail;
4327
4328 if (rename(temp_path, link->state_file) < 0) {
4329 r = -errno;
4330 goto fail;
4331 }
4332
4333 return 0;
4334
4335 fail:
4336 (void) unlink(link->state_file);
4337 if (temp_path)
4338 (void) unlink(temp_path);
4339
4340 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4341 }
4342
4343 /* The serialized state in /run is no longer up-to-date. */
4344 void link_dirty(Link *link) {
4345 int r;
4346
4347 assert(link);
4348
4349 /* mark manager dirty as link is dirty */
4350 manager_dirty(link->manager);
4351
4352 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
4353 if (r < 0)
4354 /* allocation errors are ignored */
4355 return;
4356
4357 r = set_put(link->manager->dirty_links, link);
4358 if (r <= 0)
4359 /* don't take another ref if the link was already dirty */
4360 return;
4361
4362 link_ref(link);
4363 }
4364
4365 /* The serialized state in /run is up-to-date */
4366 void link_clean(Link *link) {
4367 assert(link);
4368 assert(link->manager);
4369
4370 link_unref(set_remove(link->manager->dirty_links, link));
4371 }
4372
4373 static const char* const link_state_table[_LINK_STATE_MAX] = {
4374 [LINK_STATE_PENDING] = "pending",
4375 [LINK_STATE_INITIALIZED] = "initialized",
4376 [LINK_STATE_CONFIGURING] = "configuring",
4377 [LINK_STATE_CONFIGURED] = "configured",
4378 [LINK_STATE_UNMANAGED] = "unmanaged",
4379 [LINK_STATE_FAILED] = "failed",
4380 [LINK_STATE_LINGER] = "linger",
4381 };
4382
4383 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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