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Merge pull request #12520 from ssahani/geneve
[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 uint8_t ipv6ll_mode;
2052
2053 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
2054 if (r < 0)
2055 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
2056
2057 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
2058 r = sd_netlink_message_open_container(req, AF_INET6);
2059 if (r < 0)
2060 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
2061
2062 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
2063 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
2064 if (r < 0)
2065 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
2066 }
2067
2068 if (!link_ipv6ll_enabled(link))
2069 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
2070 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
2071 /* The file may not exist. And event if it exists, when stable_secret is unset,
2072 * reading the file fails with EIO. */
2073 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
2074 else
2075 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
2076
2077 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
2078 if (r < 0)
2079 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
2080
2081 r = sd_netlink_message_close_container(req);
2082 if (r < 0)
2083 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
2084
2085 r = sd_netlink_message_close_container(req);
2086 if (r < 0)
2087 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
2088 }
2089
2090 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2091 link_netlink_destroy_callback, link);
2092 if (r < 0)
2093 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2094
2095 link_ref(link);
2096
2097 return 0;
2098 }
2099
2100 static int link_up_can(Link *link) {
2101 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2102 int r;
2103
2104 assert(link);
2105
2106 log_link_debug(link, "Bringing CAN link up");
2107
2108 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2109 if (r < 0)
2110 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2111
2112 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
2113 if (r < 0)
2114 return log_link_error_errno(link, r, "Could not set link flags: %m");
2115
2116 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2117 link_netlink_destroy_callback, link);
2118 if (r < 0)
2119 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2120
2121 link_ref(link);
2122
2123 return 0;
2124 }
2125
2126 static int link_set_can(Link *link) {
2127 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
2128 int r;
2129
2130 assert(link);
2131 assert(link->network);
2132 assert(link->manager);
2133 assert(link->manager->rtnl);
2134
2135 log_link_debug(link, "link_set_can");
2136
2137 r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
2138 if (r < 0)
2139 return log_link_error_errno(link, r, "Failed to allocate netlink message: %m");
2140
2141 r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
2142 if (r < 0)
2143 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
2144
2145 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
2146 if (r < 0)
2147 return log_link_error_errno(link, r, "Failed to open netlink container: %m");
2148
2149 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
2150 if (r < 0)
2151 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
2152
2153 if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) {
2154 struct can_bittiming bt = {
2155 .bitrate = link->network->can_bitrate,
2156 .sample_point = link->network->can_sample_point,
2157 };
2158
2159 if (link->network->can_bitrate > UINT32_MAX) {
2160 log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate);
2161 return -ERANGE;
2162 }
2163
2164 log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate);
2165 if (link->network->can_sample_point > 0)
2166 log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
2167 else
2168 log_link_debug(link, "Using default sample point");
2169
2170 r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
2171 if (r < 0)
2172 return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
2173 }
2174
2175 if (link->network->can_restart_us > 0) {
2176 char time_string[FORMAT_TIMESPAN_MAX];
2177 uint64_t restart_ms;
2178
2179 if (link->network->can_restart_us == USEC_INFINITY)
2180 restart_ms = 0;
2181 else
2182 restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC);
2183
2184 format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC);
2185
2186 if (restart_ms > UINT32_MAX) {
2187 log_link_error(link, "restart timeout (%s) too big.", time_string);
2188 return -ERANGE;
2189 }
2190
2191 log_link_debug(link, "Setting restart = %s", time_string);
2192
2193 r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
2194 if (r < 0)
2195 return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
2196 }
2197
2198 if (link->network->can_triple_sampling >= 0) {
2199 struct can_ctrlmode cm = {
2200 .mask = CAN_CTRLMODE_3_SAMPLES,
2201 .flags = link->network->can_triple_sampling ? CAN_CTRLMODE_3_SAMPLES : 0,
2202 };
2203
2204 log_link_debug(link, "%sabling triple-sampling", link->network->can_triple_sampling ? "En" : "Dis");
2205
2206 r = sd_netlink_message_append_data(m, IFLA_CAN_CTRLMODE, &cm, sizeof(cm));
2207 if (r < 0)
2208 return log_link_error_errno(link, r, "Could not append IFLA_CAN_CTRLMODE attribute: %m");
2209 }
2210
2211 r = sd_netlink_message_close_container(m);
2212 if (r < 0)
2213 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2214
2215 r = sd_netlink_message_close_container(m);
2216 if (r < 0)
2217 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2218
2219 r = netlink_call_async(link->manager->rtnl, NULL, m, link_set_handler,
2220 link_netlink_destroy_callback, link);
2221 if (r < 0)
2222 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2223
2224 link_ref(link);
2225
2226 if (!(link->flags & IFF_UP)) {
2227 r = link_up_can(link);
2228 if (r < 0) {
2229 link_enter_failed(link);
2230 return r;
2231 }
2232 }
2233
2234 log_link_debug(link, "link_set_can done");
2235
2236 return r;
2237 }
2238
2239 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2240 int r;
2241
2242 assert(link);
2243
2244 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2245 return 1;
2246
2247 r = sd_netlink_message_get_errno(m);
2248 if (r < 0)
2249 log_link_warning_errno(link, r, "Could not bring down interface: %m");
2250
2251 if (streq_ptr(link->kind, "can"))
2252 link_set_can(link);
2253
2254 return 1;
2255 }
2256
2257 int link_down(Link *link) {
2258 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2259 int r;
2260
2261 assert(link);
2262 assert(link->manager);
2263 assert(link->manager->rtnl);
2264
2265 log_link_debug(link, "Bringing link down");
2266
2267 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
2268 RTM_SETLINK, link->ifindex);
2269 if (r < 0)
2270 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2271
2272 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
2273 if (r < 0)
2274 return log_link_error_errno(link, r, "Could not set link flags: %m");
2275
2276 r = netlink_call_async(link->manager->rtnl, NULL, req, link_down_handler,
2277 link_netlink_destroy_callback, link);
2278 if (r < 0)
2279 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2280
2281 link_ref(link);
2282
2283 return 0;
2284 }
2285
2286 static int link_handle_bound_to_list(Link *link) {
2287 Link *l;
2288 Iterator i;
2289 int r;
2290 bool required_up = false;
2291 bool link_is_up = false;
2292
2293 assert(link);
2294
2295 if (hashmap_isempty(link->bound_to_links))
2296 return 0;
2297
2298 if (link->flags & IFF_UP)
2299 link_is_up = true;
2300
2301 HASHMAP_FOREACH (l, link->bound_to_links, i)
2302 if (link_has_carrier(l)) {
2303 required_up = true;
2304 break;
2305 }
2306
2307 if (!required_up && link_is_up) {
2308 r = link_down(link);
2309 if (r < 0)
2310 return r;
2311 } else if (required_up && !link_is_up) {
2312 r = link_up(link);
2313 if (r < 0)
2314 return r;
2315 }
2316
2317 return 0;
2318 }
2319
2320 static int link_handle_bound_by_list(Link *link) {
2321 Iterator i;
2322 Link *l;
2323 int r;
2324
2325 assert(link);
2326
2327 if (hashmap_isempty(link->bound_by_links))
2328 return 0;
2329
2330 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2331 r = link_handle_bound_to_list(l);
2332 if (r < 0)
2333 return r;
2334 }
2335
2336 return 0;
2337 }
2338
2339 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2340 int r;
2341
2342 assert(link);
2343 assert(carrier);
2344
2345 if (link == carrier)
2346 return 0;
2347
2348 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2349 return 0;
2350
2351 r = hashmap_ensure_allocated(h, NULL);
2352 if (r < 0)
2353 return r;
2354
2355 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2356 if (r < 0)
2357 return r;
2358
2359 return 0;
2360 }
2361
2362 static int link_new_bound_by_list(Link *link) {
2363 Manager *m;
2364 Link *carrier;
2365 Iterator i;
2366 int r;
2367 bool list_updated = false;
2368
2369 assert(link);
2370 assert(link->manager);
2371
2372 m = link->manager;
2373
2374 HASHMAP_FOREACH(carrier, m->links, i) {
2375 if (!carrier->network)
2376 continue;
2377
2378 if (strv_isempty(carrier->network->bind_carrier))
2379 continue;
2380
2381 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2382 r = link_put_carrier(link, carrier, &link->bound_by_links);
2383 if (r < 0)
2384 return r;
2385
2386 list_updated = true;
2387 }
2388 }
2389
2390 if (list_updated)
2391 link_dirty(link);
2392
2393 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2394 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2395 if (r < 0)
2396 return r;
2397
2398 link_dirty(carrier);
2399 }
2400
2401 return 0;
2402 }
2403
2404 static int link_new_bound_to_list(Link *link) {
2405 Manager *m;
2406 Link *carrier;
2407 Iterator i;
2408 int r;
2409 bool list_updated = false;
2410
2411 assert(link);
2412 assert(link->manager);
2413
2414 if (!link->network)
2415 return 0;
2416
2417 if (strv_isempty(link->network->bind_carrier))
2418 return 0;
2419
2420 m = link->manager;
2421
2422 HASHMAP_FOREACH (carrier, m->links, i) {
2423 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2424 r = link_put_carrier(link, carrier, &link->bound_to_links);
2425 if (r < 0)
2426 return r;
2427
2428 list_updated = true;
2429 }
2430 }
2431
2432 if (list_updated)
2433 link_dirty(link);
2434
2435 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2436 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2437 if (r < 0)
2438 return r;
2439
2440 link_dirty(carrier);
2441 }
2442
2443 return 0;
2444 }
2445
2446 static int link_new_carrier_maps(Link *link) {
2447 int r;
2448
2449 r = link_new_bound_by_list(link);
2450 if (r < 0)
2451 return r;
2452
2453 r = link_handle_bound_by_list(link);
2454 if (r < 0)
2455 return r;
2456
2457 r = link_new_bound_to_list(link);
2458 if (r < 0)
2459 return r;
2460
2461 r = link_handle_bound_to_list(link);
2462 if (r < 0)
2463 return r;
2464
2465 return 0;
2466 }
2467
2468 static void link_free_bound_to_list(Link *link) {
2469 Link *bound_to;
2470 Iterator i;
2471
2472 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2473 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2474
2475 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2476 link_dirty(bound_to);
2477 }
2478
2479 return;
2480 }
2481
2482 static void link_free_bound_by_list(Link *link) {
2483 Link *bound_by;
2484 Iterator i;
2485
2486 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2487 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2488
2489 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2490 link_dirty(bound_by);
2491 link_handle_bound_to_list(bound_by);
2492 }
2493 }
2494
2495 return;
2496 }
2497
2498 static void link_free_carrier_maps(Link *link) {
2499 bool list_updated = false;
2500
2501 assert(link);
2502
2503 if (!hashmap_isempty(link->bound_to_links)) {
2504 link_free_bound_to_list(link);
2505 list_updated = true;
2506 }
2507
2508 if (!hashmap_isempty(link->bound_by_links)) {
2509 link_free_bound_by_list(link);
2510 list_updated = true;
2511 }
2512
2513 if (list_updated)
2514 link_dirty(link);
2515
2516 return;
2517 }
2518
2519 static int link_append_to_master(Link *link, NetDev *netdev) {
2520 Link *master;
2521 int r;
2522
2523 assert(link);
2524 assert(netdev);
2525
2526 r = link_get(link->manager, netdev->ifindex, &master);
2527 if (r < 0)
2528 return r;
2529
2530 r = set_ensure_allocated(&master->slaves, NULL);
2531 if (r < 0)
2532 return r;
2533
2534 r = set_put(master->slaves, link);
2535 if (r < 0)
2536 return r;
2537
2538 link_ref(link);
2539 return 0;
2540 }
2541
2542 static void link_drop_from_master(Link *link, NetDev *netdev) {
2543 Link *master;
2544
2545 assert(link);
2546
2547 if (!link->manager || !netdev)
2548 return;
2549
2550 if (link_get(link->manager, netdev->ifindex, &master) < 0)
2551 return;
2552
2553 link_unref(set_remove(master->slaves, link));
2554 }
2555
2556 static void link_detach_from_manager(Link *link) {
2557 if (!link || !link->manager)
2558 return;
2559
2560 link_unref(set_remove(link->manager->links_requesting_uuid, link));
2561 link_clean(link);
2562
2563 /* The following must be called at last. */
2564 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2565 link_unref(link);
2566 }
2567
2568 void link_drop(Link *link) {
2569 if (!link || link->state == LINK_STATE_LINGER)
2570 return;
2571
2572 link_set_state(link, LINK_STATE_LINGER);
2573
2574 link_free_carrier_maps(link);
2575
2576 if (link->network) {
2577 link_drop_from_master(link, link->network->bridge);
2578 link_drop_from_master(link, link->network->bond);
2579 }
2580
2581 log_link_debug(link, "Link removed");
2582
2583 (void) unlink(link->state_file);
2584 link_detach_from_manager(link);
2585 }
2586
2587 static int link_joined(Link *link) {
2588 int r;
2589
2590 assert(link);
2591 assert(link->network);
2592
2593 if (!hashmap_isempty(link->bound_to_links)) {
2594 r = link_handle_bound_to_list(link);
2595 if (r < 0)
2596 return r;
2597 } else if (!(link->flags & IFF_UP)) {
2598 r = link_up(link);
2599 if (r < 0) {
2600 link_enter_failed(link);
2601 return r;
2602 }
2603 }
2604
2605 if (link->network->bridge) {
2606 r = link_set_bridge(link);
2607 if (r < 0)
2608 log_link_error_errno(link, r, "Could not set bridge message: %m");
2609
2610 r = link_append_to_master(link, link->network->bridge);
2611 if (r < 0)
2612 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2613 }
2614
2615 if (link->network->bond) {
2616 r = link_set_bond(link);
2617 if (r < 0)
2618 log_link_error_errno(link, r, "Could not set bond message: %m");
2619
2620 r = link_append_to_master(link, link->network->bond);
2621 if (r < 0)
2622 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2623 }
2624
2625 if (link->network->use_br_vlan &&
2626 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2627 r = link_set_bridge_vlan(link);
2628 if (r < 0)
2629 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2630 }
2631
2632 /* Skip setting up addresses until it gets carrier,
2633 or it would try to set addresses twice,
2634 which is bad for non-idempotent steps. */
2635 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2636 return 0;
2637
2638 return link_request_set_addresses(link);
2639 }
2640
2641 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2642 int r;
2643
2644 assert(link);
2645 assert(link->network);
2646 assert(link->enslaving > 0);
2647 assert(!link->enslaved_raw);
2648
2649 link->enslaving--;
2650
2651 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2652 return 1;
2653
2654 r = sd_netlink_message_get_errno(m);
2655 if (r < 0 && r != -EEXIST) {
2656 log_link_error_errno(link, r, "Could not join netdev: %m");
2657 link_enter_failed(link);
2658 return 1;
2659 } else
2660 log_link_debug(link, "Joined netdev");
2661
2662 if (link->enslaving == 0) {
2663 link->enslaved_raw = true;
2664 link_joined(link);
2665 }
2666
2667 return 1;
2668 }
2669
2670 static int link_enter_join_netdev(Link *link) {
2671 NetDev *netdev;
2672 Iterator i;
2673 int r;
2674
2675 assert(link);
2676 assert(link->network);
2677 assert(link->state == LINK_STATE_INITIALIZED);
2678
2679 link_set_state(link, LINK_STATE_CONFIGURING);
2680
2681 link_dirty(link);
2682 link->enslaving = 0;
2683 link->enslaved_raw = false;
2684
2685 if (link->network->bond) {
2686 if (link->network->bond->state == NETDEV_STATE_READY &&
2687 link->network->bond->ifindex == link->master_ifindex)
2688 return link_joined(link);
2689
2690 log_struct(LOG_DEBUG,
2691 LOG_LINK_INTERFACE(link),
2692 LOG_NETDEV_INTERFACE(link->network->bond),
2693 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2694
2695 link->enslaving++;
2696
2697 r = netdev_join(link->network->bond, link, netdev_join_handler);
2698 if (r < 0) {
2699 log_struct_errno(LOG_WARNING, r,
2700 LOG_LINK_INTERFACE(link),
2701 LOG_NETDEV_INTERFACE(link->network->bond),
2702 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2703 link_enter_failed(link);
2704 return r;
2705 }
2706 }
2707
2708 if (link->network->bridge) {
2709 log_struct(LOG_DEBUG,
2710 LOG_LINK_INTERFACE(link),
2711 LOG_NETDEV_INTERFACE(link->network->bridge),
2712 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2713
2714 link->enslaving++;
2715
2716 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2717 if (r < 0) {
2718 log_struct_errno(LOG_WARNING, r,
2719 LOG_LINK_INTERFACE(link),
2720 LOG_NETDEV_INTERFACE(link->network->bridge),
2721 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2722 link_enter_failed(link);
2723 return r;
2724 }
2725 }
2726
2727 if (link->network->vrf) {
2728 log_struct(LOG_DEBUG,
2729 LOG_LINK_INTERFACE(link),
2730 LOG_NETDEV_INTERFACE(link->network->vrf),
2731 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2732
2733 link->enslaving++;
2734
2735 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2736 if (r < 0) {
2737 log_struct_errno(LOG_WARNING, r,
2738 LOG_LINK_INTERFACE(link),
2739 LOG_NETDEV_INTERFACE(link->network->vrf),
2740 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2741 link_enter_failed(link);
2742 return r;
2743 }
2744 }
2745
2746 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2747
2748 if (netdev->ifindex > 0)
2749 /* Assume already enslaved. */
2750 continue;
2751
2752 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2753 continue;
2754
2755 log_struct(LOG_DEBUG,
2756 LOG_LINK_INTERFACE(link),
2757 LOG_NETDEV_INTERFACE(netdev),
2758 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2759
2760 link->enslaving++;
2761
2762 r = netdev_join(netdev, link, netdev_join_handler);
2763 if (r < 0) {
2764 log_struct_errno(LOG_WARNING, r,
2765 LOG_LINK_INTERFACE(link),
2766 LOG_NETDEV_INTERFACE(netdev),
2767 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2768 link_enter_failed(link);
2769 return r;
2770 }
2771 }
2772
2773 if (link->enslaving == 0)
2774 return link_joined(link);
2775
2776 return 0;
2777 }
2778
2779 static int link_set_ipv4_forward(Link *link) {
2780 int r;
2781
2782 if (!link_ipv4_forward_enabled(link))
2783 return 0;
2784
2785 /* We propagate the forwarding flag from one interface to the
2786 * global setting one way. This means: as long as at least one
2787 * interface was configured at any time that had IP forwarding
2788 * enabled the setting will stay on for good. We do this
2789 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2790 * somewhat in sync (see below). */
2791
2792 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2793 if (r < 0)
2794 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2795
2796 return 0;
2797 }
2798
2799 static int link_set_ipv6_forward(Link *link) {
2800 int r;
2801
2802 if (!link_ipv6_forward_enabled(link))
2803 return 0;
2804
2805 /* On Linux, the IPv6 stack does not know a per-interface
2806 * packet forwarding setting: either packet forwarding is on
2807 * for all, or off for all. We hence don't bother with a
2808 * per-interface setting, but simply propagate the interface
2809 * flag, if it is set, to the global flag, one-way. Note that
2810 * while IPv4 would allow a per-interface flag, we expose the
2811 * same behaviour there and also propagate the setting from
2812 * one to all, to keep things simple (see above). */
2813
2814 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2815 if (r < 0)
2816 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2817
2818 return 0;
2819 }
2820
2821 static int link_set_ipv6_privacy_extensions(Link *link) {
2822 IPv6PrivacyExtensions s;
2823 int r;
2824
2825 s = link_ipv6_privacy_extensions(link);
2826 if (s < 0)
2827 return 0;
2828
2829 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2830 if (r < 0)
2831 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2832
2833 return 0;
2834 }
2835
2836 static int link_set_ipv6_accept_ra(Link *link) {
2837 int r;
2838
2839 /* Make this a NOP if IPv6 is not available */
2840 if (!socket_ipv6_is_supported())
2841 return 0;
2842
2843 if (link->flags & IFF_LOOPBACK)
2844 return 0;
2845
2846 if (!link->network)
2847 return 0;
2848
2849 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2850 if (r < 0)
2851 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2852
2853 return 0;
2854 }
2855
2856 static int link_set_ipv6_dad_transmits(Link *link) {
2857 int r;
2858
2859 /* Make this a NOP if IPv6 is not available */
2860 if (!socket_ipv6_is_supported())
2861 return 0;
2862
2863 if (link->flags & IFF_LOOPBACK)
2864 return 0;
2865
2866 if (!link->network)
2867 return 0;
2868
2869 if (link->network->ipv6_dad_transmits < 0)
2870 return 0;
2871
2872 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2873 if (r < 0)
2874 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2875
2876 return 0;
2877 }
2878
2879 static int link_set_ipv6_hop_limit(Link *link) {
2880 int r;
2881
2882 /* Make this a NOP if IPv6 is not available */
2883 if (!socket_ipv6_is_supported())
2884 return 0;
2885
2886 if (link->flags & IFF_LOOPBACK)
2887 return 0;
2888
2889 if (!link->network)
2890 return 0;
2891
2892 if (link->network->ipv6_hop_limit < 0)
2893 return 0;
2894
2895 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2896 if (r < 0)
2897 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2898
2899 return 0;
2900 }
2901
2902 static int link_set_ipv6_mtu(Link *link) {
2903 int r;
2904
2905 /* Make this a NOP if IPv6 is not available */
2906 if (!socket_ipv6_is_supported())
2907 return 0;
2908
2909 if (link->flags & IFF_LOOPBACK)
2910 return 0;
2911
2912 if (link->network->ipv6_mtu == 0)
2913 return 0;
2914
2915 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2916 if (r < 0)
2917 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2918
2919 return 0;
2920 }
2921
2922 static bool link_is_static_address_configured(Link *link, Address *address) {
2923 Address *net_address;
2924
2925 assert(link);
2926 assert(address);
2927
2928 if (!link->network)
2929 return false;
2930
2931 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2932 if (address_equal(net_address, address))
2933 return true;
2934
2935 return false;
2936 }
2937
2938 static bool link_is_static_route_configured(Link *link, Route *route) {
2939 Route *net_route;
2940
2941 assert(link);
2942 assert(route);
2943
2944 if (!link->network)
2945 return false;
2946
2947 LIST_FOREACH(routes, net_route, link->network->static_routes)
2948 if (route_equal(net_route, route))
2949 return true;
2950
2951 return false;
2952 }
2953
2954 static int link_drop_foreign_config(Link *link) {
2955 Address *address;
2956 Route *route;
2957 Iterator i;
2958 int r;
2959
2960 SET_FOREACH(address, link->addresses_foreign, i) {
2961 /* we consider IPv6LL addresses to be managed by the kernel */
2962 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2963 continue;
2964
2965 if (link_is_static_address_configured(link, address)) {
2966 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2967 if (r < 0)
2968 return log_link_error_errno(link, r, "Failed to add address: %m");
2969 } else {
2970 r = address_remove(address, link, NULL);
2971 if (r < 0)
2972 return r;
2973 }
2974 }
2975
2976 SET_FOREACH(route, link->routes_foreign, i) {
2977 /* do not touch routes managed by the kernel */
2978 if (route->protocol == RTPROT_KERNEL)
2979 continue;
2980
2981 if (link_is_static_route_configured(link, route)) {
2982 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2983 if (r < 0)
2984 return r;
2985 } else {
2986 r = route_remove(route, link, NULL);
2987 if (r < 0)
2988 return r;
2989 }
2990 }
2991
2992 return 0;
2993 }
2994
2995 static int link_drop_config(Link *link) {
2996 Address *address, *pool_address;
2997 Route *route;
2998 Iterator i;
2999 int r;
3000
3001 SET_FOREACH(address, link->addresses, i) {
3002 /* we consider IPv6LL addresses to be managed by the kernel */
3003 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
3004 continue;
3005
3006 r = address_remove(address, link, NULL);
3007 if (r < 0)
3008 return r;
3009
3010 /* If this address came from an address pool, clean up the pool */
3011 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
3012 if (address_equal(address, pool_address)) {
3013 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
3014 address_free(pool_address);
3015 break;
3016 }
3017 }
3018 }
3019
3020 SET_FOREACH(route, link->routes, i) {
3021 /* do not touch routes managed by the kernel */
3022 if (route->protocol == RTPROT_KERNEL)
3023 continue;
3024
3025 r = route_remove(route, link, NULL);
3026 if (r < 0)
3027 return r;
3028 }
3029
3030 ndisc_flush(link);
3031
3032 return 0;
3033 }
3034
3035 static int link_update_lldp(Link *link) {
3036 int r;
3037
3038 assert(link);
3039
3040 if (!link->lldp)
3041 return 0;
3042
3043 if (link->flags & IFF_UP) {
3044 r = sd_lldp_start(link->lldp);
3045 if (r > 0)
3046 log_link_debug(link, "Started LLDP.");
3047 else
3048 log_link_warning_errno(link, r, "Failed to start LLDP: %m");
3049 } else {
3050 r = sd_lldp_stop(link->lldp);
3051 if (r > 0)
3052 log_link_debug(link, "Stopped LLDP.");
3053 else
3054 log_link_warning_errno(link, r, "Failed to stop LLDP: %m");
3055 }
3056
3057 return r;
3058 }
3059
3060 static int link_configure_can(Link *link) {
3061 int r;
3062
3063 if (streq_ptr(link->kind, "can")) {
3064 /* The CAN interface must be down to configure bitrate, etc... */
3065 if ((link->flags & IFF_UP)) {
3066 r = link_down(link);
3067 if (r < 0) {
3068 link_enter_failed(link);
3069 return r;
3070 }
3071
3072 return 0;
3073 }
3074
3075 return link_set_can(link);
3076 }
3077
3078 if (!(link->flags & IFF_UP)) {
3079 r = link_up_can(link);
3080 if (r < 0) {
3081 link_enter_failed(link);
3082 return r;
3083 }
3084 }
3085
3086 return 0;
3087 }
3088
3089 static int link_configure(Link *link) {
3090 int r;
3091
3092 assert(link);
3093 assert(link->network);
3094 assert(link->state == LINK_STATE_INITIALIZED);
3095
3096 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
3097 return link_configure_can(link);
3098
3099 /* Drop foreign config, but ignore loopback or critical devices.
3100 * We do not want to remove loopback address or addresses used for root NFS. */
3101 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
3102 r = link_drop_foreign_config(link);
3103 if (r < 0)
3104 return r;
3105 }
3106
3107 r = link_set_proxy_arp(link);
3108 if (r < 0)
3109 return r;
3110
3111 r = ipv6_proxy_ndp_addresses_configure(link);
3112 if (r < 0)
3113 return r;
3114
3115 r = link_set_ipv4_forward(link);
3116 if (r < 0)
3117 return r;
3118
3119 r = link_set_ipv6_forward(link);
3120 if (r < 0)
3121 return r;
3122
3123 r = link_set_ipv6_privacy_extensions(link);
3124 if (r < 0)
3125 return r;
3126
3127 r = link_set_ipv6_accept_ra(link);
3128 if (r < 0)
3129 return r;
3130
3131 r = link_set_ipv6_dad_transmits(link);
3132 if (r < 0)
3133 return r;
3134
3135 r = link_set_ipv6_hop_limit(link);
3136 if (r < 0)
3137 return r;
3138
3139 r = link_set_flags(link);
3140 if (r < 0)
3141 return r;
3142
3143 r = link_set_ipv6_mtu(link);
3144 if (r < 0)
3145 return r;
3146
3147 if (link_ipv4ll_enabled(link) || link_ipv4ll_fallback_enabled(link)) {
3148 r = ipv4ll_configure(link);
3149 if (r < 0)
3150 return r;
3151 }
3152
3153 if (link_dhcp4_enabled(link)) {
3154 r = dhcp4_set_promote_secondaries(link);
3155 if (r < 0)
3156 return r;
3157
3158 r = dhcp4_configure(link);
3159 if (r < 0)
3160 return r;
3161 }
3162
3163 if (link_dhcp4_server_enabled(link)) {
3164 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
3165 if (r < 0)
3166 return r;
3167
3168 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
3169 if (r < 0)
3170 return r;
3171 }
3172
3173 if (link_dhcp6_enabled(link) ||
3174 link_ipv6_accept_ra_enabled(link)) {
3175 r = dhcp6_configure(link);
3176 if (r < 0)
3177 return r;
3178 }
3179
3180 if (link_ipv6_accept_ra_enabled(link)) {
3181 r = ndisc_configure(link);
3182 if (r < 0)
3183 return r;
3184 }
3185
3186 if (link_radv_enabled(link)) {
3187 r = radv_configure(link);
3188 if (r < 0)
3189 return r;
3190 }
3191
3192 if (link_lldp_rx_enabled(link)) {
3193 r = sd_lldp_new(&link->lldp);
3194 if (r < 0)
3195 return r;
3196
3197 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
3198 if (r < 0)
3199 return r;
3200
3201 r = sd_lldp_match_capabilities(link->lldp,
3202 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
3203 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
3204 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
3205 if (r < 0)
3206 return r;
3207
3208 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
3209 if (r < 0)
3210 return r;
3211
3212 r = sd_lldp_attach_event(link->lldp, NULL, 0);
3213 if (r < 0)
3214 return r;
3215
3216 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
3217 if (r < 0)
3218 return r;
3219
3220 r = link_update_lldp(link);
3221 if (r < 0)
3222 return r;
3223 }
3224
3225 r = link_set_mtu(link, link->network->mtu, link->network->mtu_is_set);
3226 if (r < 0)
3227 return r;
3228
3229 if (socket_ipv6_is_supported()) {
3230 r = link_configure_addrgen_mode(link);
3231 if (r < 0)
3232 return r;
3233 }
3234
3235 return link_configure_after_setting_mtu(link);
3236 }
3237
3238 static int link_configure_after_setting_mtu(Link *link) {
3239 int r;
3240
3241 assert(link);
3242 assert(link->network);
3243 assert(link->state == LINK_STATE_INITIALIZED);
3244
3245 if (link->setting_mtu)
3246 return 0;
3247
3248 if (link_has_carrier(link) || link->network->configure_without_carrier) {
3249 r = link_acquire_conf(link);
3250 if (r < 0)
3251 return r;
3252 }
3253
3254 return link_enter_join_netdev(link);
3255 }
3256
3257 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3258 assert(duid);
3259
3260 if (duid->raw_data_len > 0)
3261 return 0;
3262
3263 if (duid->type != DUID_TYPE_UUID)
3264 return -EINVAL;
3265
3266 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3267 duid->raw_data_len = sizeof(sd_id128_t);
3268
3269 return 1;
3270 }
3271
3272 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3273 Manager *manager = userdata;
3274 const sd_bus_error *e;
3275 const void *a;
3276 size_t sz;
3277 DUID *duid;
3278 Link *link;
3279 int r;
3280
3281 assert(m);
3282 assert(manager);
3283
3284 e = sd_bus_message_get_error(m);
3285 if (e) {
3286 log_error_errno(sd_bus_error_get_errno(e),
3287 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3288 e->message);
3289 goto configure;
3290 }
3291
3292 r = sd_bus_message_read_array(m, 'y', &a, &sz);
3293 if (r < 0)
3294 goto configure;
3295
3296 if (sz != sizeof(sd_id128_t)) {
3297 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3298 goto configure;
3299 }
3300
3301 memcpy(&manager->product_uuid, a, sz);
3302 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3303 (void) duid_set_uuid(duid, manager->product_uuid);
3304
3305 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3306
3307 configure:
3308 while ((link = set_steal_first(manager->links_requesting_uuid))) {
3309 r = link_configure(link);
3310 if (r < 0)
3311 log_link_error_errno(link, r, "Failed to configure link: %m");
3312 }
3313
3314 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3315
3316 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3317 * even if the method fails. */
3318 manager->has_product_uuid = true;
3319
3320 return 1;
3321 }
3322
3323 static bool link_requires_uuid(Link *link) {
3324 const DUID *duid;
3325
3326 assert(link);
3327 assert(link->manager);
3328 assert(link->network);
3329
3330 duid = link_get_duid(link);
3331 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3332 return false;
3333
3334 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3335 return true;
3336
3337 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3338 return true;
3339
3340 return false;
3341 }
3342
3343 static int link_configure_duid(Link *link) {
3344 Manager *m;
3345 DUID *duid;
3346 int r;
3347
3348 assert(link);
3349 assert(link->manager);
3350 assert(link->network);
3351
3352 m = link->manager;
3353 duid = link_get_duid(link);
3354
3355 if (!link_requires_uuid(link))
3356 return 1;
3357
3358 if (m->has_product_uuid) {
3359 (void) duid_set_uuid(duid, m->product_uuid);
3360 return 1;
3361 }
3362
3363 if (!m->links_requesting_uuid) {
3364 r = manager_request_product_uuid(m, link);
3365 if (r < 0) {
3366 if (r == -ENOMEM)
3367 return r;
3368
3369 log_link_warning_errno(link, r,
3370 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3371 return 1;
3372 }
3373 } else {
3374 r = set_put(m->links_requesting_uuid, link);
3375 if (r < 0)
3376 return log_oom();
3377
3378 r = set_put(m->duids_requesting_uuid, duid);
3379 if (r < 0)
3380 return log_oom();
3381 }
3382
3383 return 0;
3384 }
3385
3386 static int link_initialized_and_synced(Link *link) {
3387 Network *network;
3388 int r;
3389
3390 assert(link);
3391 assert(link->ifname);
3392 assert(link->manager);
3393
3394 /* We may get called either from the asynchronous netlink callback,
3395 * or directly for link_add() if running in a container. See link_add(). */
3396 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3397 return 0;
3398
3399 log_link_debug(link, "Link state is up-to-date");
3400 link_set_state(link, LINK_STATE_INITIALIZED);
3401
3402 r = link_new_bound_by_list(link);
3403 if (r < 0)
3404 return r;
3405
3406 r = link_handle_bound_by_list(link);
3407 if (r < 0)
3408 return r;
3409
3410 if (!link->network) {
3411 r = network_get(link->manager, link->sd_device, link->ifname,
3412 &link->mac, &network);
3413 if (r == -ENOENT) {
3414 link_enter_unmanaged(link);
3415 return 0;
3416 } else if (r == 0 && network->unmanaged) {
3417 link_enter_unmanaged(link);
3418 return 0;
3419 } else if (r < 0)
3420 return r;
3421
3422 if (link->flags & IFF_LOOPBACK) {
3423 if (network->link_local != ADDRESS_FAMILY_NO)
3424 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3425
3426 if (network->dhcp != ADDRESS_FAMILY_NO)
3427 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3428
3429 if (network->dhcp_server)
3430 log_link_debug(link, "Ignoring DHCP server for loopback link");
3431 }
3432
3433 r = network_apply(network, link);
3434 if (r < 0)
3435 return r;
3436 }
3437
3438 r = link_new_bound_to_list(link);
3439 if (r < 0)
3440 return r;
3441
3442 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3443 * link_configure() is called later asynchronously. */
3444 r = link_configure_duid(link);
3445 if (r <= 0)
3446 return r;
3447
3448 r = link_configure(link);
3449 if (r < 0)
3450 return r;
3451
3452 return 0;
3453 }
3454
3455 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3456 (void) link_initialized_and_synced(link);
3457 return 1;
3458 }
3459
3460 int link_initialized(Link *link, sd_device *device) {
3461 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3462 int r;
3463
3464 assert(link);
3465 assert(link->manager);
3466 assert(link->manager->rtnl);
3467 assert(device);
3468
3469 if (link->state != LINK_STATE_PENDING)
3470 return 0;
3471
3472 if (link->sd_device)
3473 return 0;
3474
3475 log_link_debug(link, "udev initialized link");
3476 link_set_state(link, LINK_STATE_INITIALIZED);
3477
3478 link->sd_device = sd_device_ref(device);
3479
3480 /* udev has initialized the link, but we don't know if we have yet
3481 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3482 * when it returns we know that the pending NEWLINKs have already been
3483 * processed and that we are up-to-date */
3484
3485 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3486 link->ifindex);
3487 if (r < 0)
3488 return r;
3489
3490 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3491 link_netlink_destroy_callback, link);
3492 if (r < 0)
3493 return r;
3494
3495 link_ref(link);
3496
3497 return 0;
3498 }
3499
3500 static int link_load(Link *link) {
3501 _cleanup_free_ char *network_file = NULL,
3502 *addresses = NULL,
3503 *routes = NULL,
3504 *dhcp4_address = NULL,
3505 *ipv4ll_address = NULL;
3506 union in_addr_union address;
3507 union in_addr_union route_dst;
3508 const char *p;
3509 int r;
3510
3511 assert(link);
3512
3513 r = parse_env_file(NULL, link->state_file,
3514 "NETWORK_FILE", &network_file,
3515 "ADDRESSES", &addresses,
3516 "ROUTES", &routes,
3517 "DHCP4_ADDRESS", &dhcp4_address,
3518 "IPV4LL_ADDRESS", &ipv4ll_address);
3519 if (r < 0 && r != -ENOENT)
3520 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3521
3522 if (network_file) {
3523 Network *network;
3524 char *suffix;
3525
3526 /* drop suffix */
3527 suffix = strrchr(network_file, '.');
3528 if (!suffix) {
3529 log_link_debug(link, "Failed to get network name from %s", network_file);
3530 goto network_file_fail;
3531 }
3532 *suffix = '\0';
3533
3534 r = network_get_by_name(link->manager, basename(network_file), &network);
3535 if (r < 0) {
3536 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3537 goto network_file_fail;
3538 }
3539
3540 r = network_apply(network, link);
3541 if (r < 0)
3542 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3543 }
3544
3545 network_file_fail:
3546
3547 if (addresses) {
3548 p = addresses;
3549
3550 for (;;) {
3551 _cleanup_free_ char *address_str = NULL;
3552 char *prefixlen_str;
3553 int family;
3554 unsigned char prefixlen;
3555
3556 r = extract_first_word(&p, &address_str, NULL, 0);
3557 if (r < 0) {
3558 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3559 continue;
3560 }
3561 if (r == 0)
3562 break;
3563
3564 prefixlen_str = strchr(address_str, '/');
3565 if (!prefixlen_str) {
3566 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3567 continue;
3568 }
3569
3570 *prefixlen_str++ = '\0';
3571
3572 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3573 if (r != 1) {
3574 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3575 continue;
3576 }
3577
3578 r = in_addr_from_string_auto(address_str, &family, &address);
3579 if (r < 0) {
3580 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3581 continue;
3582 }
3583
3584 r = address_add(link, family, &address, prefixlen, NULL);
3585 if (r < 0)
3586 return log_link_error_errno(link, r, "Failed to add address: %m");
3587 }
3588 }
3589
3590 if (routes) {
3591 p = routes;
3592
3593 for (;;) {
3594 Route *route;
3595 _cleanup_free_ char *route_str = NULL;
3596 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3597 usec_t lifetime;
3598 char *prefixlen_str;
3599 int family;
3600 unsigned char prefixlen, tos, table;
3601 uint32_t priority;
3602
3603 r = extract_first_word(&p, &route_str, NULL, 0);
3604 if (r < 0) {
3605 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3606 continue;
3607 }
3608 if (r == 0)
3609 break;
3610
3611 prefixlen_str = strchr(route_str, '/');
3612 if (!prefixlen_str) {
3613 log_link_debug(link, "Failed to parse route %s", route_str);
3614 continue;
3615 }
3616
3617 *prefixlen_str++ = '\0';
3618
3619 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3620 if (r != 5) {
3621 log_link_debug(link,
3622 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3623 prefixlen_str);
3624 continue;
3625 }
3626
3627 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3628 if (r < 0) {
3629 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3630 continue;
3631 }
3632
3633 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3634 if (r < 0)
3635 return log_link_error_errno(link, r, "Failed to add route: %m");
3636
3637 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3638 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3639 0, route_expire_handler, route);
3640 if (r < 0)
3641 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3642 }
3643
3644 route->lifetime = lifetime;
3645 sd_event_source_unref(route->expire);
3646 route->expire = TAKE_PTR(expire);
3647 }
3648 }
3649
3650 if (dhcp4_address) {
3651 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3652 if (r < 0) {
3653 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3654 goto dhcp4_address_fail;
3655 }
3656
3657 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3658 if (r < 0)
3659 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3660
3661 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3662 if (r < 0)
3663 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3664 }
3665
3666 dhcp4_address_fail:
3667
3668 if (ipv4ll_address) {
3669 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3670 if (r < 0) {
3671 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3672 goto ipv4ll_address_fail;
3673 }
3674
3675 r = sd_ipv4ll_new(&link->ipv4ll);
3676 if (r < 0)
3677 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3678
3679 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3680 if (r < 0)
3681 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3682 }
3683
3684 ipv4ll_address_fail:
3685
3686 return 0;
3687 }
3688
3689 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3690 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3691 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3692 Link *link;
3693 int r;
3694
3695 assert(m);
3696 assert(m->rtnl);
3697 assert(message);
3698 assert(ret);
3699
3700 r = link_new(m, message, ret);
3701 if (r < 0)
3702 return r;
3703
3704 link = *ret;
3705
3706 log_link_debug(link, "Link %d added", link->ifindex);
3707
3708 r = link_load(link);
3709 if (r < 0)
3710 return r;
3711
3712 if (detect_container() <= 0) {
3713 /* not in a container, udev will be around */
3714 sprintf(ifindex_str, "n%d", link->ifindex);
3715 r = sd_device_new_from_device_id(&device, ifindex_str);
3716 if (r < 0) {
3717 log_link_warning_errno(link, r, "Could not find device: %m");
3718 goto failed;
3719 }
3720
3721 r = sd_device_get_is_initialized(device);
3722 if (r < 0) {
3723 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3724 goto failed;
3725 }
3726 if (r == 0) {
3727 /* not yet ready */
3728 log_link_debug(link, "link pending udev initialization...");
3729 return 0;
3730 }
3731
3732 r = device_is_renaming(device);
3733 if (r < 0) {
3734 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3735 goto failed;
3736 }
3737 if (r > 0) {
3738 log_link_debug(link, "Interface is under renaming, pending initialization.");
3739 return 0;
3740 }
3741
3742 r = link_initialized(link, device);
3743 if (r < 0)
3744 goto failed;
3745 } else {
3746 r = link_initialized_and_synced(link);
3747 if (r < 0)
3748 goto failed;
3749 }
3750
3751 return 0;
3752 failed:
3753 link_enter_failed(link);
3754 return r;
3755 }
3756
3757 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3758 int r;
3759
3760 assert(link);
3761
3762 log_link_info(link, "Gained IPv6LL");
3763
3764 link->ipv6ll_address = *address;
3765 link_check_ready(link);
3766
3767 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3768 r = link_acquire_ipv6_conf(link);
3769 if (r < 0) {
3770 link_enter_failed(link);
3771 return r;
3772 }
3773 }
3774
3775 return 0;
3776 }
3777
3778 static int link_carrier_gained(Link *link) {
3779 int r;
3780
3781 assert(link);
3782
3783 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3784 r = link_acquire_conf(link);
3785 if (r < 0) {
3786 link_enter_failed(link);
3787 return r;
3788 }
3789
3790 r = link_request_set_addresses(link);
3791 if (r < 0)
3792 return r;
3793 }
3794
3795 r = link_handle_bound_by_list(link);
3796 if (r < 0)
3797 return r;
3798
3799 return 0;
3800 }
3801
3802 static int link_carrier_lost(Link *link) {
3803 int r;
3804
3805 assert(link);
3806
3807 if (link->network && link->network->ignore_carrier_loss)
3808 return 0;
3809
3810 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3811 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3812 * configuration and stop the clients as well. */
3813 if (link->setting_mtu)
3814 return 0;
3815
3816 r = link_stop_clients(link);
3817 if (r < 0) {
3818 link_enter_failed(link);
3819 return r;
3820 }
3821
3822 if (link_dhcp4_server_enabled(link))
3823 (void) sd_dhcp_server_stop(link->dhcp_server);
3824
3825 r = link_drop_config(link);
3826 if (r < 0)
3827 return r;
3828
3829 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3830 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3831 r = link_drop_foreign_config(link);
3832 if (r < 0)
3833 return r;
3834 }
3835
3836 r = link_handle_bound_by_list(link);
3837 if (r < 0)
3838 return r;
3839
3840 return 0;
3841 }
3842
3843 int link_carrier_reset(Link *link) {
3844 int r;
3845
3846 assert(link);
3847
3848 if (link_has_carrier(link)) {
3849 r = link_carrier_lost(link);
3850 if (r < 0)
3851 return r;
3852
3853 r = link_carrier_gained(link);
3854 if (r < 0)
3855 return r;
3856
3857 log_link_info(link, "Reset carrier");
3858 }
3859
3860 return 0;
3861 }
3862
3863 int link_update(Link *link, sd_netlink_message *m) {
3864 struct ether_addr mac;
3865 const char *ifname;
3866 uint32_t mtu;
3867 bool had_carrier, carrier_gained, carrier_lost;
3868 int r;
3869
3870 assert(link);
3871 assert(link->ifname);
3872 assert(m);
3873
3874 if (link->state == LINK_STATE_LINGER) {
3875 log_link_info(link, "Link re-added");
3876 link_set_state(link, LINK_STATE_CONFIGURING);
3877
3878 r = link_new_carrier_maps(link);
3879 if (r < 0)
3880 return r;
3881 }
3882
3883 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3884 if (r >= 0 && !streq(ifname, link->ifname)) {
3885 Manager *manager = link->manager;
3886
3887 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3888
3889 link_drop(link);
3890 r = link_add(manager, m, &link);
3891 if (r < 0)
3892 return r;
3893 }
3894
3895 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3896 if (r >= 0 && mtu > 0) {
3897 link->mtu = mtu;
3898 if (link->original_mtu == 0) {
3899 link->original_mtu = mtu;
3900 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3901 }
3902
3903 if (link->dhcp_client) {
3904 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3905 link->mtu);
3906 if (r < 0)
3907 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3908 }
3909
3910 if (link->radv) {
3911 r = sd_radv_set_mtu(link->radv, link->mtu);
3912 if (r < 0)
3913 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3914 }
3915 }
3916
3917 /* The kernel may broadcast NEWLINK messages without the MAC address
3918 set, simply ignore them. */
3919 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3920 if (r >= 0) {
3921 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3922 ETH_ALEN)) {
3923
3924 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3925 ETH_ALEN);
3926
3927 log_link_debug(link, "MAC address: "
3928 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3929 mac.ether_addr_octet[0],
3930 mac.ether_addr_octet[1],
3931 mac.ether_addr_octet[2],
3932 mac.ether_addr_octet[3],
3933 mac.ether_addr_octet[4],
3934 mac.ether_addr_octet[5]);
3935
3936 if (link->ipv4ll) {
3937 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3938 if (r < 0)
3939 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3940 }
3941
3942 if (link->dhcp_client) {
3943 r = sd_dhcp_client_set_mac(link->dhcp_client,
3944 (const uint8_t *) &link->mac,
3945 sizeof (link->mac),
3946 ARPHRD_ETHER);
3947 if (r < 0)
3948 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3949
3950 r = dhcp4_set_client_identifier(link);
3951 if (r < 0)
3952 return r;
3953 }
3954
3955 if (link->dhcp6_client) {
3956 const DUID* duid = link_get_duid(link);
3957
3958 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3959 (const uint8_t *) &link->mac,
3960 sizeof (link->mac),
3961 ARPHRD_ETHER);
3962 if (r < 0)
3963 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3964
3965 if (link->network->iaid_set) {
3966 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3967 link->network->iaid);
3968 if (r < 0)
3969 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3970 }
3971
3972 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3973 duid->type,
3974 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3975 duid->raw_data_len);
3976 if (r < 0)
3977 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3978 }
3979
3980 if (link->radv) {
3981 r = sd_radv_set_mac(link->radv, &link->mac);
3982 if (r < 0)
3983 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3984 }
3985
3986 if (link->ndisc) {
3987 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3988 if (r < 0)
3989 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3990 }
3991 }
3992 }
3993
3994 had_carrier = link_has_carrier(link);
3995
3996 r = link_update_flags(link, m);
3997 if (r < 0)
3998 return r;
3999
4000 r = link_update_lldp(link);
4001 if (r < 0)
4002 return r;
4003
4004 carrier_gained = !had_carrier && link_has_carrier(link);
4005 carrier_lost = had_carrier && !link_has_carrier(link);
4006
4007 if (carrier_gained) {
4008 log_link_info(link, "Gained carrier");
4009
4010 r = link_carrier_gained(link);
4011 if (r < 0)
4012 return r;
4013 } else if (carrier_lost) {
4014 log_link_info(link, "Lost carrier");
4015
4016 r = link_carrier_lost(link);
4017 if (r < 0)
4018 return r;
4019 }
4020
4021 return 0;
4022 }
4023
4024 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
4025 bool space = false;
4026 Iterator i;
4027 Link *link;
4028
4029 assert(f);
4030 assert(prefix);
4031
4032 if (hashmap_isempty(h))
4033 return;
4034
4035 fputs(prefix, f);
4036 HASHMAP_FOREACH(link, h, i) {
4037 if (space)
4038 fputc(' ', f);
4039
4040 fprintf(f, "%i", link->ifindex);
4041 space = true;
4042 }
4043
4044 fputc('\n', f);
4045 }
4046
4047 int link_save(Link *link) {
4048 _cleanup_free_ char *temp_path = NULL;
4049 _cleanup_fclose_ FILE *f = NULL;
4050 const char *admin_state, *oper_state;
4051 Address *a;
4052 Route *route;
4053 Iterator i;
4054 int r;
4055
4056 assert(link);
4057 assert(link->state_file);
4058 assert(link->lease_file);
4059 assert(link->manager);
4060
4061 if (link->state == LINK_STATE_LINGER) {
4062 (void) unlink(link->state_file);
4063 return 0;
4064 }
4065
4066 link_lldp_save(link);
4067
4068 admin_state = link_state_to_string(link->state);
4069 assert(admin_state);
4070
4071 oper_state = link_operstate_to_string(link->operstate);
4072 assert(oper_state);
4073
4074 r = fopen_temporary(link->state_file, &f, &temp_path);
4075 if (r < 0)
4076 goto fail;
4077
4078 (void) fchmod(fileno(f), 0644);
4079
4080 fprintf(f,
4081 "# This is private data. Do not parse.\n"
4082 "ADMIN_STATE=%s\n"
4083 "OPER_STATE=%s\n",
4084 admin_state, oper_state);
4085
4086 if (link->network) {
4087 bool space;
4088 sd_dhcp6_lease *dhcp6_lease = NULL;
4089 const char *dhcp_domainname = NULL;
4090 char **dhcp6_domains = NULL;
4091 char **dhcp_domains = NULL;
4092 unsigned j;
4093
4094 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4095 yes_no(link->network->required_for_online));
4096
4097 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
4098 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
4099
4100 if (link->dhcp6_client) {
4101 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
4102 if (r < 0 && r != -ENOMSG)
4103 log_link_debug(link, "No DHCPv6 lease");
4104 }
4105
4106 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4107
4108 fputs("DNS=", f);
4109 space = false;
4110
4111 for (j = 0; j < link->network->n_dns; j++) {
4112 _cleanup_free_ char *b = NULL;
4113
4114 r = in_addr_to_string(link->network->dns[j].family,
4115 &link->network->dns[j].address, &b);
4116 if (r < 0) {
4117 log_debug_errno(r, "Failed to format address, ignoring: %m");
4118 continue;
4119 }
4120
4121 if (space)
4122 fputc(' ', f);
4123 fputs(b, f);
4124 space = true;
4125 }
4126
4127 if (link->network->dhcp_use_dns &&
4128 link->dhcp_lease) {
4129 const struct in_addr *addresses;
4130
4131 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
4132 if (r > 0)
4133 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4134 space = true;
4135 }
4136
4137 if (link->network->dhcp_use_dns && dhcp6_lease) {
4138 struct in6_addr *in6_addrs;
4139
4140 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
4141 if (r > 0) {
4142 if (space)
4143 fputc(' ', f);
4144 serialize_in6_addrs(f, in6_addrs, r);
4145 space = true;
4146 }
4147 }
4148
4149 /* Make sure to flush out old entries before we use the NDISC data */
4150 ndisc_vacuum(link);
4151
4152 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4153 NDiscRDNSS *dd;
4154
4155 SET_FOREACH(dd, link->ndisc_rdnss, i) {
4156 if (space)
4157 fputc(' ', f);
4158
4159 serialize_in6_addrs(f, &dd->address, 1);
4160 space = true;
4161 }
4162 }
4163
4164 fputc('\n', f);
4165
4166 fputs("NTP=", f);
4167 space = false;
4168 fputstrv(f, link->network->ntp, NULL, &space);
4169
4170 if (link->network->dhcp_use_ntp &&
4171 link->dhcp_lease) {
4172 const struct in_addr *addresses;
4173
4174 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
4175 if (r > 0)
4176 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4177 space = true;
4178 }
4179
4180 if (link->network->dhcp_use_ntp && dhcp6_lease) {
4181 struct in6_addr *in6_addrs;
4182 char **hosts;
4183
4184 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
4185 &in6_addrs);
4186 if (r > 0) {
4187 if (space)
4188 fputc(' ', f);
4189 serialize_in6_addrs(f, in6_addrs, r);
4190 space = true;
4191 }
4192
4193 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
4194 if (r > 0)
4195 fputstrv(f, hosts, NULL, &space);
4196 }
4197
4198 fputc('\n', f);
4199
4200 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4201 if (link->dhcp_lease) {
4202 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4203 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4204 }
4205 if (dhcp6_lease)
4206 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4207 }
4208
4209 ordered_set_print(f, "DOMAINS=", link->network->search_domains);
4210
4211 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4212 NDiscDNSSL *dd;
4213
4214 if (dhcp_domainname)
4215 fputs_with_space(f, dhcp_domainname, NULL, &space);
4216 if (dhcp_domains)
4217 fputstrv(f, dhcp_domains, NULL, &space);
4218 if (dhcp6_domains)
4219 fputstrv(f, dhcp6_domains, NULL, &space);
4220
4221 SET_FOREACH(dd, link->ndisc_dnssl, i)
4222 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4223 }
4224
4225 fputc('\n', f);
4226
4227 ordered_set_print(f, "ROUTE_DOMAINS=", link->network->route_domains);
4228
4229 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4230 NDiscDNSSL *dd;
4231
4232 if (dhcp_domainname)
4233 fputs_with_space(f, dhcp_domainname, NULL, &space);
4234 if (dhcp_domains)
4235 fputstrv(f, dhcp_domains, NULL, &space);
4236 if (dhcp6_domains)
4237 fputstrv(f, dhcp6_domains, NULL, &space);
4238
4239 SET_FOREACH(dd, link->ndisc_dnssl, i)
4240 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4241 }
4242
4243 fputc('\n', f);
4244
4245 fprintf(f, "LLMNR=%s\n",
4246 resolve_support_to_string(link->network->llmnr));
4247 fprintf(f, "MDNS=%s\n",
4248 resolve_support_to_string(link->network->mdns));
4249 if (link->network->dns_default_route >= 0)
4250 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
4251
4252 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4253 fprintf(f, "DNS_OVER_TLS=%s\n",
4254 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
4255
4256 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
4257 fprintf(f, "DNSSEC=%s\n",
4258 dnssec_mode_to_string(link->network->dnssec_mode));
4259
4260 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
4261 const char *n;
4262
4263 fputs("DNSSEC_NTA=", f);
4264 space = false;
4265 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
4266 fputs_with_space(f, n, NULL, &space);
4267 fputc('\n', f);
4268 }
4269
4270 fputs("ADDRESSES=", f);
4271 space = false;
4272 SET_FOREACH(a, link->addresses, i) {
4273 _cleanup_free_ char *address_str = NULL;
4274
4275 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4276 if (r < 0)
4277 goto fail;
4278
4279 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4280 space = true;
4281 }
4282 fputc('\n', f);
4283
4284 fputs("ROUTES=", f);
4285 space = false;
4286 SET_FOREACH(route, link->routes, i) {
4287 _cleanup_free_ char *route_str = NULL;
4288
4289 r = in_addr_to_string(route->family, &route->dst, &route_str);
4290 if (r < 0)
4291 goto fail;
4292
4293 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4294 space ? " " : "", route_str,
4295 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4296 space = true;
4297 }
4298
4299 fputc('\n', f);
4300 }
4301
4302 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4303 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4304
4305 if (link->dhcp_lease) {
4306 struct in_addr address;
4307 const char *tz = NULL;
4308
4309 assert(link->network);
4310
4311 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
4312 if (r >= 0)
4313 fprintf(f, "TIMEZONE=%s\n", tz);
4314
4315 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
4316 if (r >= 0) {
4317 fputs("DHCP4_ADDRESS=", f);
4318 serialize_in_addrs(f, &address, 1, false, NULL);
4319 fputc('\n', f);
4320 }
4321
4322 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4323 if (r < 0)
4324 goto fail;
4325
4326 fprintf(f,
4327 "DHCP_LEASE=%s\n",
4328 link->lease_file);
4329 } else
4330 (void) unlink(link->lease_file);
4331
4332 if (link->ipv4ll) {
4333 struct in_addr address;
4334
4335 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4336 if (r >= 0) {
4337 fputs("IPV4LL_ADDRESS=", f);
4338 serialize_in_addrs(f, &address, 1, false, NULL);
4339 fputc('\n', f);
4340 }
4341 }
4342
4343 r = fflush_and_check(f);
4344 if (r < 0)
4345 goto fail;
4346
4347 if (rename(temp_path, link->state_file) < 0) {
4348 r = -errno;
4349 goto fail;
4350 }
4351
4352 return 0;
4353
4354 fail:
4355 (void) unlink(link->state_file);
4356 if (temp_path)
4357 (void) unlink(temp_path);
4358
4359 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4360 }
4361
4362 /* The serialized state in /run is no longer up-to-date. */
4363 void link_dirty(Link *link) {
4364 int r;
4365
4366 assert(link);
4367
4368 /* mark manager dirty as link is dirty */
4369 manager_dirty(link->manager);
4370
4371 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
4372 if (r < 0)
4373 /* allocation errors are ignored */
4374 return;
4375
4376 r = set_put(link->manager->dirty_links, link);
4377 if (r <= 0)
4378 /* don't take another ref if the link was already dirty */
4379 return;
4380
4381 link_ref(link);
4382 }
4383
4384 /* The serialized state in /run is up-to-date */
4385 void link_clean(Link *link) {
4386 assert(link);
4387 assert(link->manager);
4388
4389 link_unref(set_remove(link->manager->dirty_links, link));
4390 }
4391
4392 static const char* const link_state_table[_LINK_STATE_MAX] = {
4393 [LINK_STATE_PENDING] = "pending",
4394 [LINK_STATE_INITIALIZED] = "initialized",
4395 [LINK_STATE_CONFIGURING] = "configuring",
4396 [LINK_STATE_CONFIGURED] = "configured",
4397 [LINK_STATE_UNMANAGED] = "unmanaged",
4398 [LINK_STATE_FAILED] = "failed",
4399 [LINK_STATE_LINGER] = "linger",
4400 };
4401
4402 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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