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[thirdparty/systemd.git] / src / network / networkd-link.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <netinet/ether.h>
4 #include <linux/if.h>
5 #include <linux/can/netlink.h>
6 #include <unistd.h>
7 #include <stdio_ext.h>
8
9 #include "alloc-util.h"
10 #include "bus-util.h"
11 #include "dhcp-identifier.h"
12 #include "dhcp-lease-internal.h"
13 #include "env-file.h"
14 #include "fd-util.h"
15 #include "fileio.h"
16 #include "missing_network.h"
17 #include "netdev/vrf.h"
18 #include "netlink-util.h"
19 #include "network-internal.h"
20 #include "networkd-ipv6-proxy-ndp.h"
21 #include "networkd-lldp-tx.h"
22 #include "networkd-manager.h"
23 #include "networkd-ndisc.h"
24 #include "networkd-neighbor.h"
25 #include "networkd-radv.h"
26 #include "networkd-routing-policy-rule.h"
27 #include "set.h"
28 #include "socket-util.h"
29 #include "stdio-util.h"
30 #include "string-table.h"
31 #include "strv.h"
32 #include "sysctl-util.h"
33 #include "tmpfile-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 static 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 static bool link_ipv6ll_enabled(Link *link) {
132 assert(link);
133
134 if (!socket_ipv6_is_supported())
135 return false;
136
137 if (link->flags & IFF_LOOPBACK)
138 return false;
139
140 if (!link->network)
141 return false;
142
143 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard"))
144 return false;
145
146 if (link->network->bond)
147 return false;
148
149 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
150 return false;
151
152 return link->network->link_local & ADDRESS_FAMILY_IPV6;
153 }
154
155 static bool link_ipv6_enabled(Link *link) {
156 assert(link);
157
158 if (!socket_ipv6_is_supported())
159 return false;
160
161 if (link->network->bond)
162 return false;
163
164 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
165 return false;
166
167 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
168 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
169 }
170
171 static bool link_radv_enabled(Link *link) {
172 assert(link);
173
174 if (!link_ipv6ll_enabled(link))
175 return false;
176
177 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
178 }
179
180 static bool link_lldp_rx_enabled(Link *link) {
181 assert(link);
182
183 if (link->flags & IFF_LOOPBACK)
184 return false;
185
186 if (link->iftype != ARPHRD_ETHER)
187 return false;
188
189 if (!link->network)
190 return false;
191
192 /* LLDP should be handled on bridge slaves as those have a direct
193 * connection to their peers not on the bridge master. Linux doesn't
194 * even (by default) forward lldp packets to the bridge master.*/
195 if (streq_ptr("bridge", link->kind))
196 return false;
197
198 return link->network->lldp_mode != LLDP_MODE_NO;
199 }
200
201 static bool link_lldp_emit_enabled(Link *link) {
202 assert(link);
203
204 if (link->flags & IFF_LOOPBACK)
205 return false;
206
207 if (link->iftype != ARPHRD_ETHER)
208 return false;
209
210 if (!link->network)
211 return false;
212
213 return link->network->lldp_emit != LLDP_EMIT_NO;
214 }
215
216 static bool link_ipv4_forward_enabled(Link *link) {
217 assert(link);
218
219 if (link->flags & IFF_LOOPBACK)
220 return false;
221
222 if (!link->network)
223 return false;
224
225 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
226 return false;
227
228 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
229 }
230
231 static bool link_ipv6_forward_enabled(Link *link) {
232 assert(link);
233
234 if (!socket_ipv6_is_supported())
235 return false;
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 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
247 return false;
248
249 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
250 }
251
252 static bool link_proxy_arp_enabled(Link *link) {
253 assert(link);
254
255 if (link->flags & IFF_LOOPBACK)
256 return false;
257
258 if (!link->network)
259 return false;
260
261 if (link->network->proxy_arp < 0)
262 return false;
263
264 return true;
265 }
266
267 static bool link_ipv6_accept_ra_enabled(Link *link) {
268 assert(link);
269
270 if (!socket_ipv6_is_supported())
271 return false;
272
273 if (link->flags & IFF_LOOPBACK)
274 return false;
275
276 if (!link->network)
277 return false;
278
279 if (!link_ipv6ll_enabled(link))
280 return false;
281
282 /* If unset use system default (enabled if local forwarding is disabled.
283 * disabled if local forwarding is enabled).
284 * If set, ignore or enforce RA independent of local forwarding state.
285 */
286 if (link->network->ipv6_accept_ra < 0)
287 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
288 return !link_ipv6_forward_enabled(link);
289 else if (link->network->ipv6_accept_ra > 0)
290 /* accept RA even if ip_forward is enabled */
291 return true;
292 else
293 /* ignore RA */
294 return false;
295 }
296
297 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
298 assert(link);
299
300 if (!socket_ipv6_is_supported())
301 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
302
303 if (link->flags & IFF_LOOPBACK)
304 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
305
306 if (!link->network)
307 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
308
309 return link->network->ipv6_privacy_extensions;
310 }
311
312 static int link_enable_ipv6(Link *link) {
313 bool disabled;
314 int r;
315
316 if (link->flags & IFF_LOOPBACK)
317 return 0;
318
319 disabled = !link_ipv6_enabled(link);
320
321 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", disabled);
322 if (r < 0)
323 log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m",
324 enable_disable(!disabled), link->ifname);
325 else
326 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
327
328 return 0;
329 }
330
331 static bool link_is_enslaved(Link *link) {
332 if (link->flags & IFF_SLAVE)
333 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
334 return true;
335
336 if (!link->enslaved_raw)
337 return false;
338
339 if (!link->network)
340 return false;
341
342 if (link->network->bridge)
343 /* TODO: support the case when link is not managed by networkd. */
344 return true;
345
346 return false;
347 }
348
349 static void link_update_master_operstate(Link *link, NetDev *netdev) {
350 Link *master;
351
352 if (!netdev)
353 return;
354
355 if (link_get(link->manager, netdev->ifindex, &master) < 0)
356 return;
357
358 link_update_operstate(master, true);
359 }
360
361 void link_update_operstate(Link *link, bool also_update_master) {
362 LinkOperationalState operstate;
363 Iterator i;
364
365 assert(link);
366
367 if (link->kernel_operstate == IF_OPER_DORMANT)
368 operstate = LINK_OPERSTATE_DORMANT;
369 else if (link_has_carrier(link)) {
370 Address *address;
371 uint8_t scope = RT_SCOPE_NOWHERE;
372
373 /* if we have carrier, check what addresses we have */
374 SET_FOREACH(address, link->addresses, i) {
375 if (!address_is_ready(address))
376 continue;
377
378 if (address->scope < scope)
379 scope = address->scope;
380 }
381
382 /* for operstate we also take foreign addresses into account */
383 SET_FOREACH(address, link->addresses_foreign, i) {
384 if (!address_is_ready(address))
385 continue;
386
387 if (address->scope < scope)
388 scope = address->scope;
389 }
390
391 if (scope < RT_SCOPE_SITE)
392 /* universally accessible addresses found */
393 operstate = LINK_OPERSTATE_ROUTABLE;
394 else if (scope < RT_SCOPE_HOST)
395 /* only link or site local addresses found */
396 operstate = LINK_OPERSTATE_DEGRADED;
397 else
398 /* no useful addresses found */
399 operstate = LINK_OPERSTATE_CARRIER;
400 } else if (link->flags & IFF_UP)
401 operstate = LINK_OPERSTATE_NO_CARRIER;
402 else
403 operstate = LINK_OPERSTATE_OFF;
404
405 if (IN_SET(operstate, LINK_OPERSTATE_DEGRADED, LINK_OPERSTATE_CARRIER) &&
406 link_is_enslaved(link))
407 operstate = LINK_OPERSTATE_ENSLAVED;
408
409 if (IN_SET(operstate, LINK_OPERSTATE_CARRIER, LINK_OPERSTATE_ENSLAVED, LINK_OPERSTATE_ROUTABLE)) {
410 Link *slave;
411
412 HASHMAP_FOREACH(slave, link->slaves, i) {
413 link_update_operstate(slave, false);
414
415 if (IN_SET(slave->operstate,
416 LINK_OPERSTATE_OFF, LINK_OPERSTATE_NO_CARRIER, LINK_OPERSTATE_DORMANT))
417 operstate = LINK_OPERSTATE_DEGRADED;
418 }
419 }
420
421 if (link->operstate != operstate) {
422 link->operstate = operstate;
423 link_send_changed(link, "OperationalState", NULL);
424 link_dirty(link);
425 }
426
427 if (also_update_master && link->network) {
428 link_update_master_operstate(link, link->network->bond);
429 link_update_master_operstate(link, link->network->bridge);
430 }
431 }
432
433 #define FLAG_STRING(string, flag, old, new) \
434 (((old ^ new) & flag) \
435 ? ((old & flag) ? (" -" string) : (" +" string)) \
436 : "")
437
438 static int link_update_flags(Link *link, sd_netlink_message *m) {
439 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
440 uint8_t operstate;
441 int r;
442
443 assert(link);
444
445 r = sd_rtnl_message_link_get_flags(m, &flags);
446 if (r < 0)
447 return log_link_warning_errno(link, r, "Could not get link flags: %m");
448
449 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
450 if (r < 0)
451 /* if we got a message without operstate, take it to mean
452 the state was unchanged */
453 operstate = link->kernel_operstate;
454
455 if ((link->flags == flags) && (link->kernel_operstate == operstate))
456 return 0;
457
458 if (link->flags != flags) {
459 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",
460 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
461 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
462 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
463 FLAG_STRING("UP", IFF_UP, link->flags, flags),
464 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
465 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
466 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
467 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
468 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
469 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
470 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
471 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
472 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
473 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
474 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
475 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
476 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
477 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
478 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
479
480 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
481 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
482 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
483 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
484 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
485 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
486 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
487 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
488
489 /* link flags are currently at most 18 bits, let's align to
490 * printing 20 */
491 if (unknown_flags_added)
492 log_link_debug(link,
493 "Unknown link flags gained: %#.5x (ignoring)",
494 unknown_flags_added);
495
496 if (unknown_flags_removed)
497 log_link_debug(link,
498 "Unknown link flags lost: %#.5x (ignoring)",
499 unknown_flags_removed);
500 }
501
502 link->flags = flags;
503 link->kernel_operstate = operstate;
504
505 link_update_operstate(link, true);
506
507 return 0;
508 }
509
510 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_unref);
511
512 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
513 _cleanup_(link_unrefp) Link *link = NULL;
514 uint16_t type;
515 const char *ifname, *kind = NULL;
516 int r, ifindex;
517 unsigned short iftype;
518
519 assert(manager);
520 assert(message);
521 assert(ret);
522
523 /* check for link kind */
524 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
525 if (r == 0) {
526 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
527 r = sd_netlink_message_exit_container(message);
528 if (r < 0)
529 return r;
530 }
531
532 r = sd_netlink_message_get_type(message, &type);
533 if (r < 0)
534 return r;
535 else if (type != RTM_NEWLINK)
536 return -EINVAL;
537
538 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
539 if (r < 0)
540 return r;
541 else if (ifindex <= 0)
542 return -EINVAL;
543
544 r = sd_rtnl_message_link_get_type(message, &iftype);
545 if (r < 0)
546 return r;
547
548 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
549 if (r < 0)
550 return r;
551
552 link = new(Link, 1);
553 if (!link)
554 return -ENOMEM;
555
556 *link = (Link) {
557 .n_ref = 1,
558 .manager = manager,
559 .state = LINK_STATE_PENDING,
560 .rtnl_extended_attrs = true,
561 .ifindex = ifindex,
562 .iftype = iftype,
563 };
564
565 link->ifname = strdup(ifname);
566 if (!link->ifname)
567 return -ENOMEM;
568
569 if (kind) {
570 link->kind = strdup(kind);
571 if (!link->kind)
572 return -ENOMEM;
573 }
574
575 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
576 if (r < 0)
577 log_link_debug_errno(link, r, "New device has no master, continuing without");
578
579 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
580 if (r < 0)
581 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
582
583 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
584 return -ENOMEM;
585
586 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
587 return -ENOMEM;
588
589 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
590 return -ENOMEM;
591
592 r = hashmap_ensure_allocated(&manager->links, NULL);
593 if (r < 0)
594 return r;
595
596 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
597 if (r < 0)
598 return r;
599
600 r = link_update_flags(link, message);
601 if (r < 0)
602 return r;
603
604 *ret = TAKE_PTR(link);
605
606 return 0;
607 }
608
609 static void link_detach_from_manager(Link *link) {
610 if (!link || !link->manager)
611 return;
612
613 hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex));
614 set_remove(link->manager->links_requesting_uuid, link);
615 link_clean(link);
616 }
617
618 static Link *link_free(Link *link) {
619 Link *carrier, *master;
620 Address *address;
621 Route *route;
622 Iterator i;
623
624 assert(link);
625
626 while ((route = set_first(link->routes)))
627 route_free(route);
628
629 while ((route = set_first(link->routes_foreign)))
630 route_free(route);
631
632 link->routes = set_free(link->routes);
633 link->routes_foreign = set_free(link->routes_foreign);
634
635 while ((address = set_first(link->addresses)))
636 address_free(address);
637
638 while ((address = set_first(link->addresses_foreign)))
639 address_free(address);
640
641 link->addresses = set_free(link->addresses);
642 link->addresses_foreign = set_free(link->addresses_foreign);
643
644 while ((address = link->pool_addresses)) {
645 LIST_REMOVE(addresses, link->pool_addresses, address);
646 address_free(address);
647 }
648
649 sd_dhcp_server_unref(link->dhcp_server);
650 sd_dhcp_client_unref(link->dhcp_client);
651 sd_dhcp_lease_unref(link->dhcp_lease);
652
653 link_lldp_emit_stop(link);
654
655 free(link->lease_file);
656
657 sd_lldp_unref(link->lldp);
658 free(link->lldp_file);
659
660 ndisc_flush(link);
661
662 sd_ipv4ll_unref(link->ipv4ll);
663 sd_dhcp6_client_unref(link->dhcp6_client);
664 sd_ndisc_unref(link->ndisc);
665 sd_radv_unref(link->radv);
666
667 link_detach_from_manager(link);
668
669 free(link->ifname);
670
671 free(link->kind);
672
673 (void) unlink(link->state_file);
674 free(link->state_file);
675
676 sd_device_unref(link->sd_device);
677
678 HASHMAP_FOREACH (carrier, link->bound_to_links, i)
679 hashmap_remove(link->bound_to_links, INT_TO_PTR(carrier->ifindex));
680 hashmap_free(link->bound_to_links);
681
682 HASHMAP_FOREACH (carrier, link->bound_by_links, i)
683 hashmap_remove(link->bound_by_links, INT_TO_PTR(carrier->ifindex));
684 hashmap_free(link->bound_by_links);
685
686 hashmap_free(link->slaves);
687
688 if (link->network) {
689 if (link->network->bond &&
690 link_get(link->manager, link->network->bond->ifindex, &master) >= 0)
691 (void) hashmap_remove(master->slaves, INT_TO_PTR(link->ifindex));
692
693 if (link->network->bridge &&
694 link_get(link->manager, link->network->bridge->ifindex, &master) >= 0)
695 (void) hashmap_remove(master->slaves, INT_TO_PTR(link->ifindex));
696 }
697
698 return mfree(link);
699 }
700
701 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
702
703 int link_get(Manager *m, int ifindex, Link **ret) {
704 Link *link;
705
706 assert(m);
707 assert(ifindex);
708 assert(ret);
709
710 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
711 if (!link)
712 return -ENODEV;
713
714 *ret = link;
715
716 return 0;
717 }
718
719 static void link_set_state(Link *link, LinkState state) {
720 assert(link);
721
722 if (link->state == state)
723 return;
724
725 link->state = state;
726
727 link_send_changed(link, "AdministrativeState", NULL);
728 }
729
730 static void link_enter_unmanaged(Link *link) {
731 assert(link);
732
733 log_link_debug(link, "Unmanaged");
734
735 link_set_state(link, LINK_STATE_UNMANAGED);
736
737 link_dirty(link);
738 }
739
740 static int link_stop_clients(Link *link) {
741 int r = 0, k;
742
743 assert(link);
744 assert(link->manager);
745 assert(link->manager->event);
746
747 if (link->dhcp_client) {
748 k = sd_dhcp_client_stop(link->dhcp_client);
749 if (k < 0)
750 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
751 }
752
753 if (link->ipv4ll) {
754 k = sd_ipv4ll_stop(link->ipv4ll);
755 if (k < 0)
756 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
757 }
758
759 if (link->dhcp6_client) {
760 k = sd_dhcp6_client_stop(link->dhcp6_client);
761 if (k < 0)
762 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
763 }
764
765 if (link->ndisc) {
766 k = sd_ndisc_stop(link->ndisc);
767 if (k < 0)
768 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
769 }
770
771 if (link->radv) {
772 k = sd_radv_stop(link->radv);
773 if (k < 0)
774 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
775 }
776
777 link_lldp_emit_stop(link);
778 return r;
779 }
780
781 void link_enter_failed(Link *link) {
782 assert(link);
783
784 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
785 return;
786
787 log_link_warning(link, "Failed");
788
789 link_set_state(link, LINK_STATE_FAILED);
790
791 link_stop_clients(link);
792
793 link_dirty(link);
794 }
795
796 static Address* link_find_dhcp_server_address(Link *link) {
797 Address *address;
798
799 assert(link);
800 assert(link->network);
801
802 /* The first statically configured address if there is any */
803 LIST_FOREACH(addresses, address, link->network->static_addresses) {
804
805 if (address->family != AF_INET)
806 continue;
807
808 if (in_addr_is_null(address->family, &address->in_addr))
809 continue;
810
811 return address;
812 }
813
814 /* If that didn't work, find a suitable address we got from the pool */
815 LIST_FOREACH(addresses, address, link->pool_addresses) {
816 if (address->family != AF_INET)
817 continue;
818
819 return address;
820 }
821
822 return NULL;
823 }
824
825 static void link_enter_configured(Link *link) {
826 assert(link);
827 assert(link->network);
828
829 if (link->state != LINK_STATE_CONFIGURING)
830 return;
831
832 log_link_info(link, "Configured");
833
834 link_set_state(link, LINK_STATE_CONFIGURED);
835
836 link_dirty(link);
837 }
838
839 static int link_request_set_routing_policy_rule(Link *link) {
840 RoutingPolicyRule *rule, *rrule = NULL;
841 int r;
842
843 assert(link);
844 assert(link->network);
845
846 link_set_state(link, LINK_STATE_CONFIGURING);
847 link->routing_policy_rules_configured = false;
848
849 LIST_FOREACH(rules, rule, link->network->rules) {
850 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
851 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif,
852 rule->protocol, &rule->sport, &rule->dport, &rrule);
853 if (r == 0) {
854 (void) routing_policy_rule_make_local(link->manager, rrule);
855 continue;
856 }
857
858 r = routing_policy_rule_configure(rule, link, NULL, false);
859 if (r < 0) {
860 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
861 link_enter_failed(link);
862 return r;
863 }
864
865 link->routing_policy_rule_messages++;
866 }
867
868 routing_policy_rule_purge(link->manager, link);
869 if (link->routing_policy_rule_messages == 0) {
870 link->routing_policy_rules_configured = true;
871 link_check_ready(link);
872 } else
873 log_link_debug(link, "Setting routing policy rules");
874
875 return 0;
876 }
877
878 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
879 int r;
880
881 assert(link);
882 assert(link->route_messages > 0);
883 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
884 LINK_STATE_FAILED, LINK_STATE_LINGER));
885
886 link->route_messages--;
887
888 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
889 return 1;
890
891 r = sd_netlink_message_get_errno(m);
892 if (r < 0 && r != -EEXIST)
893 log_link_warning_errno(link, r, "Could not set route: %m");
894
895 if (link->route_messages == 0) {
896 log_link_debug(link, "Routes set");
897 link->static_routes_configured = true;
898 link_check_ready(link);
899 }
900
901 return 1;
902 }
903
904 static int link_request_set_routes(Link *link) {
905 enum {
906 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
907 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
908 _PHASE_MAX
909 } phase;
910 Route *rt;
911 int r;
912
913 assert(link);
914 assert(link->network);
915 assert(link->addresses_configured);
916 assert(link->address_messages == 0);
917 assert(link->state != _LINK_STATE_INVALID);
918
919 link_set_state(link, LINK_STATE_CONFIGURING);
920 link->static_routes_configured = false;
921
922 r = link_request_set_routing_policy_rule(link);
923 if (r < 0)
924 return r;
925
926 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
927 for (phase = 0; phase < _PHASE_MAX; phase++)
928 LIST_FOREACH(routes, rt, link->network->static_routes) {
929
930 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
931 continue;
932
933 r = route_configure(rt, link, route_handler);
934 if (r < 0) {
935 log_link_warning_errno(link, r, "Could not set routes: %m");
936 link_enter_failed(link);
937 return r;
938 }
939
940 link->route_messages++;
941 }
942
943 if (link->route_messages == 0) {
944 link->static_routes_configured = true;
945 link_check_ready(link);
946 } else
947 log_link_debug(link, "Setting routes");
948
949 return 0;
950 }
951
952 void link_check_ready(Link *link) {
953 Address *a;
954 Iterator i;
955
956 assert(link);
957
958 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
959 return;
960
961 if (!link->network)
962 return;
963
964 if (!link->addresses_configured)
965 return;
966
967 if (!link->neighbors_configured)
968 return;
969
970 SET_FOREACH(a, link->addresses, i)
971 if (!address_is_ready(a))
972 return;
973
974 if (!link->addresses_ready) {
975 link->addresses_ready = true;
976 link_request_set_routes(link);
977 }
978
979 if (!link->static_routes_configured)
980 return;
981
982 if (!link->routing_policy_rules_configured)
983 return;
984
985 if (link_ipv4ll_enabled(link))
986 if (!link->ipv4ll_address ||
987 !link->ipv4ll_route)
988 return;
989
990 if (link_ipv6ll_enabled(link) &&
991 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
992 return;
993
994 if ((link_dhcp4_enabled(link) && !link_dhcp6_enabled(link) &&
995 !link->dhcp4_configured) ||
996 (link_dhcp6_enabled(link) && !link_dhcp4_enabled(link) &&
997 !link->dhcp6_configured) ||
998 (link_dhcp4_enabled(link) && link_dhcp6_enabled(link) &&
999 !link->dhcp4_configured && !link->dhcp6_configured))
1000 return;
1001
1002 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
1003 return;
1004
1005 if (link->state != LINK_STATE_CONFIGURED)
1006 link_enter_configured(link);
1007
1008 return;
1009 }
1010
1011 static int link_request_set_neighbors(Link *link) {
1012 Neighbor *neighbor;
1013 int r;
1014
1015 assert(link);
1016 assert(link->network);
1017 assert(link->state != _LINK_STATE_INVALID);
1018
1019 link_set_state(link, LINK_STATE_CONFIGURING);
1020 link->neighbors_configured = false;
1021
1022 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1023 r = neighbor_configure(neighbor, link, NULL);
1024 if (r < 0) {
1025 log_link_warning_errno(link, r, "Could not set neighbor: %m");
1026 link_enter_failed(link);
1027 return r;
1028 }
1029 }
1030
1031 if (link->neighbor_messages == 0) {
1032 link->neighbors_configured = true;
1033 link_check_ready(link);
1034 } else
1035 log_link_debug(link, "Setting neighbors");
1036
1037 return 0;
1038 }
1039
1040 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1041 int r;
1042
1043 assert(rtnl);
1044 assert(m);
1045 assert(link);
1046 assert(link->ifname);
1047 assert(link->address_messages > 0);
1048 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1049 LINK_STATE_FAILED, LINK_STATE_LINGER));
1050
1051 link->address_messages--;
1052
1053 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1054 return 1;
1055
1056 r = sd_netlink_message_get_errno(m);
1057 if (r < 0 && r != -EEXIST)
1058 log_link_warning_errno(link, r, "could not set address: %m");
1059 else if (r >= 0)
1060 manager_rtnl_process_address(rtnl, m, link->manager);
1061
1062 if (link->address_messages == 0) {
1063 log_link_debug(link, "Addresses set");
1064 link->addresses_configured = true;
1065 link_check_ready(link);
1066 }
1067
1068 return 1;
1069 }
1070
1071 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1072 _cleanup_free_ struct in_addr *addresses = NULL;
1073 size_t n_addresses = 0, n_allocated = 0;
1074 unsigned i;
1075
1076 log_debug("Copying DNS server information from %s", link->ifname);
1077
1078 if (!link->network)
1079 return 0;
1080
1081 for (i = 0; i < link->network->n_dns; i++) {
1082 struct in_addr ia;
1083
1084 /* Only look for IPv4 addresses */
1085 if (link->network->dns[i].family != AF_INET)
1086 continue;
1087
1088 ia = link->network->dns[i].address.in;
1089
1090 /* Never propagate obviously borked data */
1091 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1092 continue;
1093
1094 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1095 return log_oom();
1096
1097 addresses[n_addresses++] = ia;
1098 }
1099
1100 if (link->network->dhcp_use_dns && link->dhcp_lease) {
1101 const struct in_addr *da = NULL;
1102 int j, n;
1103
1104 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
1105 if (n > 0) {
1106
1107 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1108 return log_oom();
1109
1110 for (j = 0; j < n; j++)
1111 if (in4_addr_is_non_local(&da[j]))
1112 addresses[n_addresses++] = da[j];
1113 }
1114 }
1115
1116 if (n_addresses <= 0)
1117 return 0;
1118
1119 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
1120 }
1121
1122 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1123 _cleanup_free_ struct in_addr *addresses = NULL;
1124 size_t n_addresses = 0, n_allocated = 0;
1125 char **a;
1126
1127 if (!link->network)
1128 return 0;
1129
1130 log_debug("Copying NTP server information from %s", link->ifname);
1131
1132 STRV_FOREACH(a, link->network->ntp) {
1133 struct in_addr ia;
1134
1135 /* Only look for IPv4 addresses */
1136 if (inet_pton(AF_INET, *a, &ia) <= 0)
1137 continue;
1138
1139 /* Never propagate obviously borked data */
1140 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1141 continue;
1142
1143 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1144 return log_oom();
1145
1146 addresses[n_addresses++] = ia;
1147 }
1148
1149 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1150 const struct in_addr *da = NULL;
1151 int j, n;
1152
1153 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1154 if (n > 0) {
1155
1156 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1157 return log_oom();
1158
1159 for (j = 0; j < n; j++)
1160 if (in4_addr_is_non_local(&da[j]))
1161 addresses[n_addresses++] = da[j];
1162 }
1163 }
1164
1165 if (n_addresses <= 0)
1166 return 0;
1167
1168 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1169 }
1170
1171 static int link_set_bridge_fdb(Link *link) {
1172 FdbEntry *fdb_entry;
1173 int r;
1174
1175 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1176 r = fdb_entry_configure(link, fdb_entry);
1177 if (r < 0)
1178 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1179 }
1180
1181 return 0;
1182 }
1183
1184 static int link_request_set_addresses(Link *link) {
1185 AddressLabel *label;
1186 Address *ad;
1187 int r;
1188
1189 assert(link);
1190 assert(link->network);
1191 assert(link->state != _LINK_STATE_INVALID);
1192
1193 link_set_state(link, LINK_STATE_CONFIGURING);
1194
1195 /* Reset all *_configured flags we are configuring. */
1196 link->addresses_configured = false;
1197 link->addresses_ready = false;
1198 link->neighbors_configured = false;
1199 link->static_routes_configured = false;
1200 link->routing_policy_rules_configured = false;
1201
1202 r = link_set_bridge_fdb(link);
1203 if (r < 0)
1204 return r;
1205
1206 r = link_request_set_neighbors(link);
1207 if (r < 0)
1208 return r;
1209
1210 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1211 bool update;
1212
1213 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1214
1215 r = address_configure(ad, link, address_handler, update);
1216 if (r < 0) {
1217 log_link_warning_errno(link, r, "Could not set addresses: %m");
1218 link_enter_failed(link);
1219 return r;
1220 }
1221
1222 link->address_messages++;
1223 }
1224
1225 LIST_FOREACH(labels, label, link->network->address_labels) {
1226 r = address_label_configure(label, link, NULL, false);
1227 if (r < 0) {
1228 log_link_warning_errno(link, r, "Could not set address label: %m");
1229 link_enter_failed(link);
1230 return r;
1231 }
1232
1233 link->address_label_messages++;
1234 }
1235
1236 /* now that we can figure out a default address for the dhcp server,
1237 start it */
1238 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1239 Address *address;
1240 Link *uplink = NULL;
1241 bool acquired_uplink = false;
1242
1243 address = link_find_dhcp_server_address(link);
1244 if (!address) {
1245 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1246 link_enter_failed(link);
1247 return 0;
1248 }
1249
1250 /* use the server address' subnet as the pool */
1251 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1252 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1253 if (r < 0)
1254 return r;
1255
1256 /* TODO:
1257 r = sd_dhcp_server_set_router(link->dhcp_server,
1258 &main_address->in_addr.in);
1259 if (r < 0)
1260 return r;
1261 */
1262
1263 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1264 r = sd_dhcp_server_set_max_lease_time(
1265 link->dhcp_server,
1266 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1267 if (r < 0)
1268 return r;
1269 }
1270
1271 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1272 r = sd_dhcp_server_set_default_lease_time(
1273 link->dhcp_server,
1274 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1275 if (r < 0)
1276 return r;
1277 }
1278
1279 if (link->network->dhcp_server_emit_dns) {
1280
1281 if (link->network->n_dhcp_server_dns > 0)
1282 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1283 else {
1284 uplink = manager_find_uplink(link->manager, link);
1285 acquired_uplink = true;
1286
1287 if (!uplink) {
1288 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1289 r = 0;
1290 } else
1291 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1292 }
1293 if (r < 0)
1294 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1295 }
1296
1297 if (link->network->dhcp_server_emit_ntp) {
1298
1299 if (link->network->n_dhcp_server_ntp > 0)
1300 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1301 else {
1302 if (!acquired_uplink)
1303 uplink = manager_find_uplink(link->manager, link);
1304
1305 if (!uplink) {
1306 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1307 r = 0;
1308 } else
1309 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1310
1311 }
1312 if (r < 0)
1313 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1314 }
1315
1316 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1317 if (r < 0)
1318 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1319
1320 if (link->network->dhcp_server_emit_timezone) {
1321 _cleanup_free_ char *buffer = NULL;
1322 const char *tz = NULL;
1323
1324 if (link->network->dhcp_server_timezone)
1325 tz = link->network->dhcp_server_timezone;
1326 else {
1327 r = get_timezone(&buffer);
1328 if (r < 0)
1329 log_warning_errno(r, "Failed to determine timezone: %m");
1330 else
1331 tz = buffer;
1332 }
1333
1334 if (tz) {
1335 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1336 if (r < 0)
1337 return r;
1338 }
1339 }
1340 if (!sd_dhcp_server_is_running(link->dhcp_server)) {
1341 r = sd_dhcp_server_start(link->dhcp_server);
1342 if (r < 0) {
1343 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1344
1345 link_enter_failed(link);
1346
1347 return 0;
1348 }
1349 }
1350
1351 log_link_debug(link, "Offering DHCPv4 leases");
1352 }
1353
1354 if (link->address_messages == 0) {
1355 link->addresses_configured = true;
1356 link_check_ready(link);
1357 } else
1358 log_link_debug(link, "Setting addresses");
1359
1360 return 0;
1361 }
1362
1363 static int link_set_bridge_vlan(Link *link) {
1364 int r = 0;
1365
1366 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1367 if (r < 0)
1368 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1369
1370 return r;
1371 }
1372
1373 static int link_set_proxy_arp(Link *link) {
1374 int r;
1375
1376 if (!link_proxy_arp_enabled(link))
1377 return 0;
1378
1379 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1380 if (r < 0)
1381 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1382
1383 return 0;
1384 }
1385
1386 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1387 int r;
1388
1389 assert(link);
1390
1391 log_link_debug(link, "Set link");
1392
1393 r = sd_netlink_message_get_errno(m);
1394 if (r < 0 && r != -EEXIST) {
1395 log_link_error_errno(link, r, "Could not join netdev: %m");
1396 link_enter_failed(link);
1397 }
1398
1399 return 1;
1400 }
1401
1402 static int link_configure_after_setting_mtu(Link *link);
1403
1404 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1405 int r;
1406
1407 assert(m);
1408 assert(link);
1409 assert(link->ifname);
1410
1411 link->setting_mtu = false;
1412
1413 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1414 return 1;
1415
1416 r = sd_netlink_message_get_errno(m);
1417 if (r < 0) {
1418 log_link_warning_errno(link, r, "Could not set MTU: %m");
1419 return 1;
1420 }
1421
1422 log_link_debug(link, "Setting MTU done.");
1423
1424 if (link->state == LINK_STATE_PENDING)
1425 (void) link_configure_after_setting_mtu(link);
1426
1427 return 1;
1428 }
1429
1430 int link_set_mtu(Link *link, uint32_t mtu, bool force) {
1431 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1432 int r;
1433
1434 assert(link);
1435 assert(link->manager);
1436 assert(link->manager->rtnl);
1437
1438 if (mtu == 0 || link->setting_mtu)
1439 return 0;
1440
1441 if (force ? link->mtu == mtu : link->mtu >= mtu)
1442 return 0;
1443
1444 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1445
1446 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1447 if (r < 0)
1448 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1449
1450 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1451 * for this interface, then disable IPv6 else enable it. */
1452 (void) link_enable_ipv6(link);
1453
1454 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1455 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1456 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1457
1458 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1459 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1460
1461 mtu = IPV6_MIN_MTU;
1462 }
1463
1464 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1465 if (r < 0)
1466 return log_link_error_errno(link, r, "Could not append MTU: %m");
1467
1468 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1469 link_netlink_destroy_callback, link);
1470 if (r < 0)
1471 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1472
1473 link_ref(link);
1474 link->setting_mtu = true;
1475
1476 return 0;
1477 }
1478
1479 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1480 int r;
1481
1482 assert(m);
1483 assert(link);
1484 assert(link->ifname);
1485
1486 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1487 return 1;
1488
1489 r = sd_netlink_message_get_errno(m);
1490 if (r < 0)
1491 log_link_warning_errno(link, r, "Could not set link flags: %m");
1492
1493 return 1;
1494 }
1495
1496 static int link_set_flags(Link *link) {
1497 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1498 unsigned ifi_change = 0;
1499 unsigned ifi_flags = 0;
1500 int r;
1501
1502 assert(link);
1503 assert(link->manager);
1504 assert(link->manager->rtnl);
1505
1506 if (link->flags & IFF_LOOPBACK)
1507 return 0;
1508
1509 if (!link->network)
1510 return 0;
1511
1512 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1513 return 0;
1514
1515 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1516 if (r < 0)
1517 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1518
1519 if (link->network->arp >= 0) {
1520 ifi_change |= IFF_NOARP;
1521 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1522 }
1523
1524 if (link->network->multicast >= 0) {
1525 ifi_change |= IFF_MULTICAST;
1526 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1527 }
1528
1529 if (link->network->allmulticast >= 0) {
1530 ifi_change |= IFF_ALLMULTI;
1531 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1532 }
1533
1534 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1535 if (r < 0)
1536 return log_link_error_errno(link, r, "Could not set link flags: %m");
1537
1538 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1539 link_netlink_destroy_callback, link);
1540 if (r < 0)
1541 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1542
1543 link_ref(link);
1544
1545 return 0;
1546 }
1547
1548 static int link_set_bridge(Link *link) {
1549 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1550 int r;
1551
1552 assert(link);
1553 assert(link->network);
1554
1555 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1556 if (r < 0)
1557 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1558
1559 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1560 if (r < 0)
1561 return log_link_error_errno(link, r, "Could not set message family: %m");
1562
1563 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1564 if (r < 0)
1565 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1566
1567 if (link->network->use_bpdu >= 0) {
1568 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
1569 if (r < 0)
1570 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1571 }
1572
1573 if (link->network->hairpin >= 0) {
1574 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1575 if (r < 0)
1576 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1577 }
1578
1579 if (link->network->fast_leave >= 0) {
1580 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1581 if (r < 0)
1582 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1583 }
1584
1585 if (link->network->allow_port_to_be_root >= 0) {
1586 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
1587 if (r < 0)
1588 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1589
1590 }
1591
1592 if (link->network->unicast_flood >= 0) {
1593 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1594 if (r < 0)
1595 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1596 }
1597
1598 if (link->network->multicast_to_unicast >= 0) {
1599 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_TO_UCAST, link->network->multicast_to_unicast);
1600 if (r < 0)
1601 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_TO_UCAST attribute: %m");
1602 }
1603
1604 if (link->network->cost != 0) {
1605 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1606 if (r < 0)
1607 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1608 }
1609
1610 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1611 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1612 if (r < 0)
1613 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1614 }
1615
1616 r = sd_netlink_message_close_container(req);
1617 if (r < 0)
1618 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1619
1620 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_handler,
1621 link_netlink_destroy_callback, link);
1622 if (r < 0)
1623 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1624
1625 link_ref(link);
1626
1627 return r;
1628 }
1629
1630 static int link_set_bond_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1631 int r;
1632
1633 assert(m);
1634 assert(link);
1635 assert(link->ifname);
1636
1637 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1638 return 1;
1639
1640 r = sd_netlink_message_get_errno(m);
1641 if (r < 0) {
1642 log_link_warning_errno(link, r, "Could not set bonding interface: %m");
1643 return 1;
1644 }
1645
1646 return 1;
1647 }
1648
1649 static int link_set_bond(Link *link) {
1650 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1651 int r;
1652
1653 assert(link);
1654 assert(link->network);
1655
1656 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1657 if (r < 0)
1658 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1659
1660 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1661 if (r < 0)
1662 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1663
1664 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1665 if (r < 0)
1666 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1667
1668 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1669 if (r < 0)
1670 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1671
1672 if (link->network->active_slave) {
1673 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1674 if (r < 0)
1675 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1676 }
1677
1678 if (link->network->primary_slave) {
1679 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1680 if (r < 0)
1681 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1682 }
1683
1684 r = sd_netlink_message_close_container(req);
1685 if (r < 0)
1686 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1687
1688 r = sd_netlink_message_close_container(req);
1689 if (r < 0)
1690 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1691
1692 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_bond_handler,
1693 link_netlink_destroy_callback, link);
1694 if (r < 0)
1695 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1696
1697 link_ref(link);
1698
1699 return r;
1700 }
1701
1702 static int link_append_to_master(Link *link, NetDev *netdev) {
1703 Link *master;
1704 int r;
1705
1706 assert(link);
1707 assert(netdev);
1708
1709 r = link_get(link->manager, netdev->ifindex, &master);
1710 if (r < 0)
1711 return r;
1712
1713 r = hashmap_ensure_allocated(&master->slaves, NULL);
1714 if (r < 0)
1715 return r;
1716
1717 r = hashmap_put(master->slaves, INT_TO_PTR(link->ifindex), link);
1718 if (r < 0)
1719 return r;
1720
1721 return 0;
1722 }
1723
1724 static int link_lldp_save(Link *link) {
1725 _cleanup_free_ char *temp_path = NULL;
1726 _cleanup_fclose_ FILE *f = NULL;
1727 sd_lldp_neighbor **l = NULL;
1728 int n = 0, r, i;
1729
1730 assert(link);
1731 assert(link->lldp_file);
1732
1733 if (!link->lldp) {
1734 (void) unlink(link->lldp_file);
1735 return 0;
1736 }
1737
1738 r = sd_lldp_get_neighbors(link->lldp, &l);
1739 if (r < 0)
1740 goto finish;
1741 if (r == 0) {
1742 (void) unlink(link->lldp_file);
1743 goto finish;
1744 }
1745
1746 n = r;
1747
1748 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1749 if (r < 0)
1750 goto finish;
1751
1752 fchmod(fileno(f), 0644);
1753
1754 for (i = 0; i < n; i++) {
1755 const void *p;
1756 le64_t u;
1757 size_t sz;
1758
1759 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1760 if (r < 0)
1761 goto finish;
1762
1763 u = htole64(sz);
1764 (void) fwrite(&u, 1, sizeof(u), f);
1765 (void) fwrite(p, 1, sz, f);
1766 }
1767
1768 r = fflush_and_check(f);
1769 if (r < 0)
1770 goto finish;
1771
1772 if (rename(temp_path, link->lldp_file) < 0) {
1773 r = -errno;
1774 goto finish;
1775 }
1776
1777 finish:
1778 if (r < 0) {
1779 (void) unlink(link->lldp_file);
1780 if (temp_path)
1781 (void) unlink(temp_path);
1782
1783 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1784 }
1785
1786 if (l) {
1787 for (i = 0; i < n; i++)
1788 sd_lldp_neighbor_unref(l[i]);
1789 free(l);
1790 }
1791
1792 return r;
1793 }
1794
1795 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1796 Link *link = userdata;
1797 int r;
1798
1799 assert(link);
1800
1801 (void) link_lldp_save(link);
1802
1803 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1804 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1805
1806 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1807
1808 r = link_lldp_emit_start(link);
1809 if (r < 0)
1810 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1811 }
1812 }
1813
1814 static int link_acquire_ipv6_conf(Link *link) {
1815 int r;
1816
1817 assert(link);
1818
1819 if (link_ipv6_accept_ra_enabled(link)) {
1820 assert(link->ndisc);
1821
1822 log_link_debug(link, "Discovering IPv6 routers");
1823
1824 r = sd_ndisc_start(link->ndisc);
1825 if (r < 0 && r != -EBUSY)
1826 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1827 }
1828
1829 if (link_radv_enabled(link)) {
1830 assert(link->radv);
1831 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1832
1833 log_link_debug(link, "Starting IPv6 Router Advertisements");
1834
1835 r = sd_radv_start(link->radv);
1836 if (r < 0 && r != -EBUSY)
1837 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1838 }
1839
1840 (void) dhcp6_request_prefix_delegation(link);
1841
1842 return 0;
1843 }
1844
1845 static int link_acquire_ipv4_conf(Link *link) {
1846 int r;
1847
1848 assert(link);
1849 assert(link->network);
1850 assert(link->manager);
1851 assert(link->manager->event);
1852
1853 if (link_ipv4ll_enabled(link)) {
1854 assert(link->ipv4ll);
1855
1856 log_link_debug(link, "Acquiring IPv4 link-local address");
1857
1858 r = sd_ipv4ll_start(link->ipv4ll);
1859 if (r < 0)
1860 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1861 }
1862
1863 if (link_dhcp4_enabled(link)) {
1864 assert(link->dhcp_client);
1865
1866 log_link_debug(link, "Acquiring DHCPv4 lease");
1867
1868 r = sd_dhcp_client_start(link->dhcp_client);
1869 if (r < 0)
1870 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1871 }
1872
1873 return 0;
1874 }
1875
1876 static int link_acquire_conf(Link *link) {
1877 int r;
1878
1879 assert(link);
1880
1881 r = link_acquire_ipv4_conf(link);
1882 if (r < 0)
1883 return r;
1884
1885 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1886 r = link_acquire_ipv6_conf(link);
1887 if (r < 0)
1888 return r;
1889 }
1890
1891 if (link_lldp_emit_enabled(link)) {
1892 r = link_lldp_emit_start(link);
1893 if (r < 0)
1894 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1895 }
1896
1897 return 0;
1898 }
1899
1900 bool link_has_carrier(Link *link) {
1901 /* see Documentation/networking/operstates.txt in the kernel sources */
1902
1903 if (link->kernel_operstate == IF_OPER_UP)
1904 return true;
1905
1906 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1907 /* operstate may not be implemented, so fall back to flags */
1908 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1909 return true;
1910
1911 return false;
1912 }
1913
1914 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1915 int r;
1916
1917 assert(link);
1918
1919 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1920 return 1;
1921
1922 r = sd_netlink_message_get_errno(m);
1923 if (r < 0)
1924 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1925
1926 return 1;
1927 }
1928
1929 static int link_configure_addrgen_mode(Link *link) {
1930 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1931 uint8_t ipv6ll_mode;
1932 int r;
1933
1934 assert(link);
1935 assert(link->network);
1936 assert(link->manager);
1937 assert(link->manager->rtnl);
1938
1939 log_link_debug(link, "Setting address genmode for link");
1940
1941 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1942 if (r < 0)
1943 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1944
1945 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1946 if (r < 0)
1947 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1948
1949 r = sd_netlink_message_open_container(req, AF_INET6);
1950 if (r < 0)
1951 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1952
1953 if (!link_ipv6ll_enabled(link))
1954 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1955 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1956 /* The file may not exist. And event if it exists, when stable_secret is unset,
1957 * reading the file fails with EIO. */
1958 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1959 else
1960 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1961
1962 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1963 if (r < 0)
1964 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1965
1966 r = sd_netlink_message_close_container(req);
1967 if (r < 0)
1968 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1969
1970 r = sd_netlink_message_close_container(req);
1971 if (r < 0)
1972 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1973
1974 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1975 link_netlink_destroy_callback, link);
1976 if (r < 0)
1977 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1978
1979 link_ref(link);
1980
1981 return 0;
1982 }
1983
1984 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1985 int r;
1986
1987 assert(link);
1988
1989 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1990 return 1;
1991
1992 r = sd_netlink_message_get_errno(m);
1993 if (r < 0)
1994 /* we warn but don't fail the link, as it may be brought up later */
1995 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1996
1997 return 1;
1998 }
1999
2000 static int link_up(Link *link) {
2001 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2002 int r;
2003
2004 assert(link);
2005 assert(link->network);
2006 assert(link->manager);
2007 assert(link->manager->rtnl);
2008
2009 log_link_debug(link, "Bringing link up");
2010
2011 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2012 if (r < 0)
2013 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2014
2015 /* set it free if not enslaved with networkd */
2016 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
2017 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
2018 if (r < 0)
2019 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
2020 }
2021
2022 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
2023 if (r < 0)
2024 return log_link_error_errno(link, r, "Could not set link flags: %m");
2025
2026 if (link->network->mac) {
2027 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
2028 if (r < 0)
2029 return log_link_error_errno(link, r, "Could not set MAC address: %m");
2030 }
2031
2032 if (link_ipv6_enabled(link)) {
2033 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
2034 if (r < 0)
2035 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
2036
2037 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
2038 r = sd_netlink_message_open_container(req, AF_INET6);
2039 if (r < 0)
2040 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
2041
2042 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
2043 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
2044 if (r < 0)
2045 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
2046 }
2047
2048 r = sd_netlink_message_close_container(req);
2049 if (r < 0)
2050 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
2051
2052 r = sd_netlink_message_close_container(req);
2053 if (r < 0)
2054 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
2055 }
2056
2057 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2058 link_netlink_destroy_callback, link);
2059 if (r < 0)
2060 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2061
2062 link_ref(link);
2063
2064 return 0;
2065 }
2066
2067 static int link_up_can(Link *link) {
2068 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2069 int r;
2070
2071 assert(link);
2072
2073 log_link_debug(link, "Bringing CAN link up");
2074
2075 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2076 if (r < 0)
2077 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2078
2079 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
2080 if (r < 0)
2081 return log_link_error_errno(link, r, "Could not set link flags: %m");
2082
2083 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2084 link_netlink_destroy_callback, link);
2085 if (r < 0)
2086 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2087
2088 link_ref(link);
2089
2090 return 0;
2091 }
2092
2093 static int link_set_can(Link *link) {
2094 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
2095 int r;
2096
2097 assert(link);
2098 assert(link->network);
2099 assert(link->manager);
2100 assert(link->manager->rtnl);
2101
2102 log_link_debug(link, "link_set_can");
2103
2104 r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
2105 if (r < 0)
2106 return log_link_error_errno(link, r, "Failed to allocate netlink message: %m");
2107
2108 r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
2109 if (r < 0)
2110 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
2111
2112 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
2113 if (r < 0)
2114 return log_link_error_errno(link, r, "Failed to open netlink container: %m");
2115
2116 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
2117 if (r < 0)
2118 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
2119
2120 if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) {
2121 struct can_bittiming bt = {
2122 .bitrate = link->network->can_bitrate,
2123 .sample_point = link->network->can_sample_point,
2124 };
2125
2126 if (link->network->can_bitrate > UINT32_MAX) {
2127 log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate);
2128 return -ERANGE;
2129 }
2130
2131 log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate);
2132 if (link->network->can_sample_point > 0)
2133 log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
2134 else
2135 log_link_debug(link, "Using default sample point");
2136
2137 r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
2138 if (r < 0)
2139 return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
2140 }
2141
2142 if (link->network->can_restart_us > 0) {
2143 char time_string[FORMAT_TIMESPAN_MAX];
2144 uint64_t restart_ms;
2145
2146 if (link->network->can_restart_us == USEC_INFINITY)
2147 restart_ms = 0;
2148 else
2149 restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC);
2150
2151 format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC);
2152
2153 if (restart_ms > UINT32_MAX) {
2154 log_link_error(link, "restart timeout (%s) too big.", time_string);
2155 return -ERANGE;
2156 }
2157
2158 log_link_debug(link, "Setting restart = %s", time_string);
2159
2160 r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
2161 if (r < 0)
2162 return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
2163 }
2164
2165 r = sd_netlink_message_close_container(m);
2166 if (r < 0)
2167 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2168
2169 r = sd_netlink_message_close_container(m);
2170 if (r < 0)
2171 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2172
2173 r = netlink_call_async(link->manager->rtnl, NULL, m, link_set_handler,
2174 link_netlink_destroy_callback, link);
2175 if (r < 0)
2176 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2177
2178 link_ref(link);
2179
2180 if (!(link->flags & IFF_UP)) {
2181 r = link_up_can(link);
2182 if (r < 0) {
2183 link_enter_failed(link);
2184 return r;
2185 }
2186 }
2187
2188 log_link_debug(link, "link_set_can done");
2189
2190 return r;
2191 }
2192
2193 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2194 int r;
2195
2196 assert(link);
2197
2198 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2199 return 1;
2200
2201 r = sd_netlink_message_get_errno(m);
2202 if (r < 0)
2203 log_link_warning_errno(link, r, "Could not bring down interface: %m");
2204
2205 if (streq_ptr(link->kind, "can"))
2206 link_set_can(link);
2207
2208 return 1;
2209 }
2210
2211 int link_down(Link *link) {
2212 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2213 int r;
2214
2215 assert(link);
2216 assert(link->manager);
2217 assert(link->manager->rtnl);
2218
2219 log_link_debug(link, "Bringing link down");
2220
2221 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
2222 RTM_SETLINK, link->ifindex);
2223 if (r < 0)
2224 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2225
2226 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
2227 if (r < 0)
2228 return log_link_error_errno(link, r, "Could not set link flags: %m");
2229
2230 r = netlink_call_async(link->manager->rtnl, NULL, req, link_down_handler,
2231 link_netlink_destroy_callback, link);
2232 if (r < 0)
2233 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2234
2235 link_ref(link);
2236
2237 return 0;
2238 }
2239
2240 static int link_handle_bound_to_list(Link *link) {
2241 Link *l;
2242 Iterator i;
2243 int r;
2244 bool required_up = false;
2245 bool link_is_up = false;
2246
2247 assert(link);
2248
2249 if (hashmap_isempty(link->bound_to_links))
2250 return 0;
2251
2252 if (link->flags & IFF_UP)
2253 link_is_up = true;
2254
2255 HASHMAP_FOREACH (l, link->bound_to_links, i)
2256 if (link_has_carrier(l)) {
2257 required_up = true;
2258 break;
2259 }
2260
2261 if (!required_up && link_is_up) {
2262 r = link_down(link);
2263 if (r < 0)
2264 return r;
2265 } else if (required_up && !link_is_up) {
2266 r = link_up(link);
2267 if (r < 0)
2268 return r;
2269 }
2270
2271 return 0;
2272 }
2273
2274 static int link_handle_bound_by_list(Link *link) {
2275 Iterator i;
2276 Link *l;
2277 int r;
2278
2279 assert(link);
2280
2281 if (hashmap_isempty(link->bound_by_links))
2282 return 0;
2283
2284 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2285 r = link_handle_bound_to_list(l);
2286 if (r < 0)
2287 return r;
2288 }
2289
2290 return 0;
2291 }
2292
2293 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2294 int r;
2295
2296 assert(link);
2297 assert(carrier);
2298
2299 if (link == carrier)
2300 return 0;
2301
2302 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2303 return 0;
2304
2305 r = hashmap_ensure_allocated(h, NULL);
2306 if (r < 0)
2307 return r;
2308
2309 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2310 if (r < 0)
2311 return r;
2312
2313 return 0;
2314 }
2315
2316 static int link_new_bound_by_list(Link *link) {
2317 Manager *m;
2318 Link *carrier;
2319 Iterator i;
2320 int r;
2321 bool list_updated = false;
2322
2323 assert(link);
2324 assert(link->manager);
2325
2326 m = link->manager;
2327
2328 HASHMAP_FOREACH(carrier, m->links, i) {
2329 if (!carrier->network)
2330 continue;
2331
2332 if (strv_isempty(carrier->network->bind_carrier))
2333 continue;
2334
2335 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2336 r = link_put_carrier(link, carrier, &link->bound_by_links);
2337 if (r < 0)
2338 return r;
2339
2340 list_updated = true;
2341 }
2342 }
2343
2344 if (list_updated)
2345 link_dirty(link);
2346
2347 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2348 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2349 if (r < 0)
2350 return r;
2351
2352 link_dirty(carrier);
2353 }
2354
2355 return 0;
2356 }
2357
2358 static int link_new_bound_to_list(Link *link) {
2359 Manager *m;
2360 Link *carrier;
2361 Iterator i;
2362 int r;
2363 bool list_updated = false;
2364
2365 assert(link);
2366 assert(link->manager);
2367
2368 if (!link->network)
2369 return 0;
2370
2371 if (strv_isempty(link->network->bind_carrier))
2372 return 0;
2373
2374 m = link->manager;
2375
2376 HASHMAP_FOREACH (carrier, m->links, i) {
2377 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2378 r = link_put_carrier(link, carrier, &link->bound_to_links);
2379 if (r < 0)
2380 return r;
2381
2382 list_updated = true;
2383 }
2384 }
2385
2386 if (list_updated)
2387 link_dirty(link);
2388
2389 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2390 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2391 if (r < 0)
2392 return r;
2393
2394 link_dirty(carrier);
2395 }
2396
2397 return 0;
2398 }
2399
2400 static int link_new_carrier_maps(Link *link) {
2401 int r;
2402
2403 r = link_new_bound_by_list(link);
2404 if (r < 0)
2405 return r;
2406
2407 r = link_handle_bound_by_list(link);
2408 if (r < 0)
2409 return r;
2410
2411 r = link_new_bound_to_list(link);
2412 if (r < 0)
2413 return r;
2414
2415 r = link_handle_bound_to_list(link);
2416 if (r < 0)
2417 return r;
2418
2419 return 0;
2420 }
2421
2422 static void link_free_bound_to_list(Link *link) {
2423 Link *bound_to;
2424 Iterator i;
2425
2426 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2427 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2428
2429 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2430 link_dirty(bound_to);
2431 }
2432
2433 return;
2434 }
2435
2436 static void link_free_bound_by_list(Link *link) {
2437 Link *bound_by;
2438 Iterator i;
2439
2440 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2441 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2442
2443 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2444 link_dirty(bound_by);
2445 link_handle_bound_to_list(bound_by);
2446 }
2447 }
2448
2449 return;
2450 }
2451
2452 static void link_free_carrier_maps(Link *link) {
2453 bool list_updated = false;
2454
2455 assert(link);
2456
2457 if (!hashmap_isempty(link->bound_to_links)) {
2458 link_free_bound_to_list(link);
2459 list_updated = true;
2460 }
2461
2462 if (!hashmap_isempty(link->bound_by_links)) {
2463 link_free_bound_by_list(link);
2464 list_updated = true;
2465 }
2466
2467 if (list_updated)
2468 link_dirty(link);
2469
2470 return;
2471 }
2472
2473 void link_drop(Link *link) {
2474 if (!link || link->state == LINK_STATE_LINGER)
2475 return;
2476
2477 link_set_state(link, LINK_STATE_LINGER);
2478
2479 link_free_carrier_maps(link);
2480
2481 log_link_debug(link, "Link removed");
2482
2483 (void) unlink(link->state_file);
2484
2485 link_detach_from_manager(link);
2486
2487 link_unref(link);
2488
2489 return;
2490 }
2491
2492 static int link_joined(Link *link) {
2493 int r;
2494
2495 assert(link);
2496 assert(link->network);
2497
2498 if (!hashmap_isempty(link->bound_to_links)) {
2499 r = link_handle_bound_to_list(link);
2500 if (r < 0)
2501 return r;
2502 } else if (!(link->flags & IFF_UP)) {
2503 r = link_up(link);
2504 if (r < 0) {
2505 link_enter_failed(link);
2506 return r;
2507 }
2508 }
2509
2510 if (link->network->bridge) {
2511 r = link_set_bridge(link);
2512 if (r < 0)
2513 log_link_error_errno(link, r, "Could not set bridge message: %m");
2514
2515 r = link_append_to_master(link, link->network->bridge);
2516 if (r < 0)
2517 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2518 }
2519
2520 if (link->network->bond) {
2521 r = link_set_bond(link);
2522 if (r < 0)
2523 log_link_error_errno(link, r, "Could not set bond message: %m");
2524
2525 r = link_append_to_master(link, link->network->bond);
2526 if (r < 0)
2527 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2528 }
2529
2530 if (link->network->use_br_vlan &&
2531 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2532 r = link_set_bridge_vlan(link);
2533 if (r < 0)
2534 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2535 }
2536
2537 /* Skip setting up addresses until it gets carrier,
2538 or it would try to set addresses twice,
2539 which is bad for non-idempotent steps. */
2540 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2541 return 0;
2542
2543 return link_request_set_addresses(link);
2544 }
2545
2546 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2547 int r;
2548
2549 assert(link);
2550 assert(link->network);
2551 assert(link->enslaving > 0);
2552 assert(!link->enslaved_raw);
2553
2554 link->enslaving--;
2555
2556 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2557 return 1;
2558
2559 r = sd_netlink_message_get_errno(m);
2560 if (r < 0 && r != -EEXIST) {
2561 log_link_error_errno(link, r, "Could not join netdev: %m");
2562 link_enter_failed(link);
2563 return 1;
2564 } else
2565 log_link_debug(link, "Joined netdev");
2566
2567 if (link->enslaving == 0) {
2568 link->enslaved_raw = true;
2569 link_joined(link);
2570 }
2571
2572 return 1;
2573 }
2574
2575 static int link_enter_join_netdev(Link *link) {
2576 NetDev *netdev;
2577 Iterator i;
2578 int r;
2579
2580 assert(link);
2581 assert(link->network);
2582 assert(link->state == LINK_STATE_PENDING);
2583
2584 link_set_state(link, LINK_STATE_CONFIGURING);
2585
2586 link_dirty(link);
2587 link->enslaving = 0;
2588 link->enslaved_raw = false;
2589
2590 if (link->network->bond) {
2591 if (link->network->bond->state == NETDEV_STATE_READY &&
2592 link->network->bond->ifindex == link->master_ifindex)
2593 return link_joined(link);
2594
2595 log_struct(LOG_DEBUG,
2596 LOG_LINK_INTERFACE(link),
2597 LOG_NETDEV_INTERFACE(link->network->bond),
2598 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2599
2600 link->enslaving++;
2601
2602 r = netdev_join(link->network->bond, link, netdev_join_handler);
2603 if (r < 0) {
2604 log_struct_errno(LOG_WARNING, r,
2605 LOG_LINK_INTERFACE(link),
2606 LOG_NETDEV_INTERFACE(link->network->bond),
2607 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2608 link_enter_failed(link);
2609 return r;
2610 }
2611 }
2612
2613 if (link->network->bridge) {
2614 log_struct(LOG_DEBUG,
2615 LOG_LINK_INTERFACE(link),
2616 LOG_NETDEV_INTERFACE(link->network->bridge),
2617 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2618
2619 link->enslaving++;
2620
2621 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2622 if (r < 0) {
2623 log_struct_errno(LOG_WARNING, r,
2624 LOG_LINK_INTERFACE(link),
2625 LOG_NETDEV_INTERFACE(link->network->bridge),
2626 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2627 link_enter_failed(link);
2628 return r;
2629 }
2630 }
2631
2632 if (link->network->vrf) {
2633 log_struct(LOG_DEBUG,
2634 LOG_LINK_INTERFACE(link),
2635 LOG_NETDEV_INTERFACE(link->network->vrf),
2636 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2637
2638 link->enslaving++;
2639
2640 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2641 if (r < 0) {
2642 log_struct_errno(LOG_WARNING, r,
2643 LOG_LINK_INTERFACE(link),
2644 LOG_NETDEV_INTERFACE(link->network->vrf),
2645 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2646 link_enter_failed(link);
2647 return r;
2648 }
2649 }
2650
2651 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2652
2653 if (netdev->ifindex > 0) {
2654 link_joined(link);
2655 continue;
2656 }
2657
2658 log_struct(LOG_DEBUG,
2659 LOG_LINK_INTERFACE(link),
2660 LOG_NETDEV_INTERFACE(netdev),
2661 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2662
2663 link->enslaving++;
2664
2665 r = netdev_join(netdev, link, netdev_join_handler);
2666 if (r < 0) {
2667 log_struct_errno(LOG_WARNING, r,
2668 LOG_LINK_INTERFACE(link),
2669 LOG_NETDEV_INTERFACE(netdev),
2670 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2671 link_enter_failed(link);
2672 return r;
2673 }
2674 }
2675
2676 if (link->enslaving == 0)
2677 return link_joined(link);
2678
2679 return 0;
2680 }
2681
2682 static int link_set_ipv4_forward(Link *link) {
2683 int r;
2684
2685 if (!link_ipv4_forward_enabled(link))
2686 return 0;
2687
2688 /* We propagate the forwarding flag from one interface to the
2689 * global setting one way. This means: as long as at least one
2690 * interface was configured at any time that had IP forwarding
2691 * enabled the setting will stay on for good. We do this
2692 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2693 * somewhat in sync (see below). */
2694
2695 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2696 if (r < 0)
2697 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2698
2699 return 0;
2700 }
2701
2702 static int link_set_ipv6_forward(Link *link) {
2703 int r;
2704
2705 if (!link_ipv6_forward_enabled(link))
2706 return 0;
2707
2708 /* On Linux, the IPv6 stack does not know a per-interface
2709 * packet forwarding setting: either packet forwarding is on
2710 * for all, or off for all. We hence don't bother with a
2711 * per-interface setting, but simply propagate the interface
2712 * flag, if it is set, to the global flag, one-way. Note that
2713 * while IPv4 would allow a per-interface flag, we expose the
2714 * same behaviour there and also propagate the setting from
2715 * one to all, to keep things simple (see above). */
2716
2717 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2718 if (r < 0)
2719 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2720
2721 return 0;
2722 }
2723
2724 static int link_set_ipv6_privacy_extensions(Link *link) {
2725 IPv6PrivacyExtensions s;
2726 int r;
2727
2728 s = link_ipv6_privacy_extensions(link);
2729 if (s < 0)
2730 return 0;
2731
2732 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2733 if (r < 0)
2734 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2735
2736 return 0;
2737 }
2738
2739 static int link_set_ipv6_accept_ra(Link *link) {
2740 int r;
2741
2742 /* Make this a NOP if IPv6 is not available */
2743 if (!socket_ipv6_is_supported())
2744 return 0;
2745
2746 if (link->flags & IFF_LOOPBACK)
2747 return 0;
2748
2749 if (!link->network)
2750 return 0;
2751
2752 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2753 if (r < 0)
2754 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2755
2756 return 0;
2757 }
2758
2759 static int link_set_ipv6_dad_transmits(Link *link) {
2760 int r;
2761
2762 /* Make this a NOP if IPv6 is not available */
2763 if (!socket_ipv6_is_supported())
2764 return 0;
2765
2766 if (link->flags & IFF_LOOPBACK)
2767 return 0;
2768
2769 if (!link->network)
2770 return 0;
2771
2772 if (link->network->ipv6_dad_transmits < 0)
2773 return 0;
2774
2775 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2776 if (r < 0)
2777 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2778
2779 return 0;
2780 }
2781
2782 static int link_set_ipv6_hop_limit(Link *link) {
2783 int r;
2784
2785 /* Make this a NOP if IPv6 is not available */
2786 if (!socket_ipv6_is_supported())
2787 return 0;
2788
2789 if (link->flags & IFF_LOOPBACK)
2790 return 0;
2791
2792 if (!link->network)
2793 return 0;
2794
2795 if (link->network->ipv6_hop_limit < 0)
2796 return 0;
2797
2798 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2799 if (r < 0)
2800 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2801
2802 return 0;
2803 }
2804
2805 static int link_set_ipv6_mtu(Link *link) {
2806 int r;
2807
2808 /* Make this a NOP if IPv6 is not available */
2809 if (!socket_ipv6_is_supported())
2810 return 0;
2811
2812 if (link->flags & IFF_LOOPBACK)
2813 return 0;
2814
2815 if (link->network->ipv6_mtu == 0)
2816 return 0;
2817
2818 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2819 if (r < 0)
2820 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2821
2822 return 0;
2823 }
2824
2825 static bool link_is_static_address_configured(Link *link, Address *address) {
2826 Address *net_address;
2827
2828 assert(link);
2829 assert(address);
2830
2831 if (!link->network)
2832 return false;
2833
2834 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2835 if (address_equal(net_address, address))
2836 return true;
2837
2838 return false;
2839 }
2840
2841 static bool link_is_static_route_configured(Link *link, Route *route) {
2842 Route *net_route;
2843
2844 assert(link);
2845 assert(route);
2846
2847 if (!link->network)
2848 return false;
2849
2850 LIST_FOREACH(routes, net_route, link->network->static_routes)
2851 if (route_equal(net_route, route))
2852 return true;
2853
2854 return false;
2855 }
2856
2857 static int link_drop_foreign_config(Link *link) {
2858 Address *address;
2859 Route *route;
2860 Iterator i;
2861 int r;
2862
2863 SET_FOREACH(address, link->addresses_foreign, i) {
2864 /* we consider IPv6LL addresses to be managed by the kernel */
2865 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2866 continue;
2867
2868 if (link_is_static_address_configured(link, address)) {
2869 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2870 if (r < 0)
2871 return log_link_error_errno(link, r, "Failed to add address: %m");
2872 } else {
2873 r = address_remove(address, link, NULL);
2874 if (r < 0)
2875 return r;
2876 }
2877 }
2878
2879 SET_FOREACH(route, link->routes_foreign, i) {
2880 /* do not touch routes managed by the kernel */
2881 if (route->protocol == RTPROT_KERNEL)
2882 continue;
2883
2884 if (link_is_static_route_configured(link, route)) {
2885 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2886 if (r < 0)
2887 return r;
2888 } else {
2889 r = route_remove(route, link, NULL);
2890 if (r < 0)
2891 return r;
2892 }
2893 }
2894
2895 return 0;
2896 }
2897
2898 static int link_drop_config(Link *link) {
2899 Address *address, *pool_address;
2900 Route *route;
2901 Iterator i;
2902 int r;
2903
2904 SET_FOREACH(address, link->addresses, i) {
2905 /* we consider IPv6LL addresses to be managed by the kernel */
2906 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2907 continue;
2908
2909 r = address_remove(address, link, NULL);
2910 if (r < 0)
2911 return r;
2912
2913 /* If this address came from an address pool, clean up the pool */
2914 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2915 if (address_equal(address, pool_address)) {
2916 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2917 address_free(pool_address);
2918 break;
2919 }
2920 }
2921 }
2922
2923 SET_FOREACH(route, link->routes, i) {
2924 /* do not touch routes managed by the kernel */
2925 if (route->protocol == RTPROT_KERNEL)
2926 continue;
2927
2928 r = route_remove(route, link, NULL);
2929 if (r < 0)
2930 return r;
2931 }
2932
2933 ndisc_flush(link);
2934
2935 return 0;
2936 }
2937
2938 static int link_update_lldp(Link *link) {
2939 int r;
2940
2941 assert(link);
2942
2943 if (!link->lldp)
2944 return 0;
2945
2946 if (link->flags & IFF_UP) {
2947 r = sd_lldp_start(link->lldp);
2948 if (r > 0)
2949 log_link_debug(link, "Started LLDP.");
2950 } else {
2951 r = sd_lldp_stop(link->lldp);
2952 if (r > 0)
2953 log_link_debug(link, "Stopped LLDP.");
2954 }
2955
2956 return r;
2957 }
2958
2959 static int link_configure_can(Link *link) {
2960 int r;
2961
2962 if (streq_ptr(link->kind, "can")) {
2963 /* The CAN interface must be down to configure bitrate, etc... */
2964 if ((link->flags & IFF_UP)) {
2965 r = link_down(link);
2966 if (r < 0) {
2967 link_enter_failed(link);
2968 return r;
2969 }
2970
2971 return 0;
2972 }
2973
2974 return link_set_can(link);
2975 }
2976
2977 if (!(link->flags & IFF_UP)) {
2978 r = link_up_can(link);
2979 if (r < 0) {
2980 link_enter_failed(link);
2981 return r;
2982 }
2983 }
2984
2985 return 0;
2986 }
2987
2988 static int link_configure(Link *link) {
2989 int r;
2990
2991 assert(link);
2992 assert(link->network);
2993 assert(link->state == LINK_STATE_PENDING);
2994
2995 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
2996 return link_configure_can(link);
2997
2998 /* Drop foreign config, but ignore loopback or critical devices.
2999 * We do not want to remove loopback address or addresses used for root NFS. */
3000 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
3001 r = link_drop_foreign_config(link);
3002 if (r < 0)
3003 return r;
3004 }
3005
3006 r = link_set_proxy_arp(link);
3007 if (r < 0)
3008 return r;
3009
3010 r = ipv6_proxy_ndp_addresses_configure(link);
3011 if (r < 0)
3012 return r;
3013
3014 r = link_set_ipv4_forward(link);
3015 if (r < 0)
3016 return r;
3017
3018 r = link_set_ipv6_forward(link);
3019 if (r < 0)
3020 return r;
3021
3022 r = link_set_ipv6_privacy_extensions(link);
3023 if (r < 0)
3024 return r;
3025
3026 r = link_set_ipv6_accept_ra(link);
3027 if (r < 0)
3028 return r;
3029
3030 r = link_set_ipv6_dad_transmits(link);
3031 if (r < 0)
3032 return r;
3033
3034 r = link_set_ipv6_hop_limit(link);
3035 if (r < 0)
3036 return r;
3037
3038 r = link_set_flags(link);
3039 if (r < 0)
3040 return r;
3041
3042 r = link_set_ipv6_mtu(link);
3043 if (r < 0)
3044 return r;
3045
3046 if (link_ipv4ll_enabled(link)) {
3047 r = ipv4ll_configure(link);
3048 if (r < 0)
3049 return r;
3050 }
3051
3052 if (link_dhcp4_enabled(link)) {
3053 r = dhcp4_set_promote_secondaries(link);
3054 if (r < 0)
3055 return r;
3056
3057 r = dhcp4_configure(link);
3058 if (r < 0)
3059 return r;
3060 }
3061
3062 if (link_dhcp4_server_enabled(link)) {
3063 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
3064 if (r < 0)
3065 return r;
3066
3067 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
3068 if (r < 0)
3069 return r;
3070 }
3071
3072 if (link_dhcp6_enabled(link) ||
3073 link_ipv6_accept_ra_enabled(link)) {
3074 r = dhcp6_configure(link);
3075 if (r < 0)
3076 return r;
3077 }
3078
3079 if (link_ipv6_accept_ra_enabled(link)) {
3080 r = ndisc_configure(link);
3081 if (r < 0)
3082 return r;
3083 }
3084
3085 if (link_radv_enabled(link)) {
3086 r = radv_configure(link);
3087 if (r < 0)
3088 return r;
3089 }
3090
3091 if (link_lldp_rx_enabled(link)) {
3092 r = sd_lldp_new(&link->lldp);
3093 if (r < 0)
3094 return r;
3095
3096 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
3097 if (r < 0)
3098 return r;
3099
3100 r = sd_lldp_match_capabilities(link->lldp,
3101 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
3102 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
3103 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
3104 if (r < 0)
3105 return r;
3106
3107 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
3108 if (r < 0)
3109 return r;
3110
3111 r = sd_lldp_attach_event(link->lldp, NULL, 0);
3112 if (r < 0)
3113 return r;
3114
3115 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
3116 if (r < 0)
3117 return r;
3118
3119 r = link_update_lldp(link);
3120 if (r < 0)
3121 return r;
3122 }
3123
3124 r = link_set_mtu(link, link->network->mtu, link->network->mtu_is_set);
3125 if (r < 0)
3126 return r;
3127
3128 if (socket_ipv6_is_supported()) {
3129 r = link_configure_addrgen_mode(link);
3130 if (r < 0)
3131 return r;
3132 }
3133
3134 return link_configure_after_setting_mtu(link);
3135 }
3136
3137 static int link_configure_after_setting_mtu(Link *link) {
3138 int r;
3139
3140 assert(link);
3141 assert(link->network);
3142 assert(link->state == LINK_STATE_PENDING);
3143
3144 if (link->setting_mtu)
3145 return 0;
3146
3147 if (link_has_carrier(link) || link->network->configure_without_carrier) {
3148 r = link_acquire_conf(link);
3149 if (r < 0)
3150 return r;
3151 }
3152
3153 return link_enter_join_netdev(link);
3154 }
3155
3156 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3157 assert(duid);
3158
3159 if (duid->raw_data_len > 0)
3160 return 0;
3161
3162 if (duid->type != DUID_TYPE_UUID)
3163 return -EINVAL;
3164
3165 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3166 duid->raw_data_len = sizeof(sd_id128_t);
3167
3168 return 1;
3169 }
3170
3171 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3172 Manager *manager = userdata;
3173 const sd_bus_error *e;
3174 const void *a;
3175 size_t sz;
3176 DUID *duid;
3177 Link *link;
3178 int r;
3179
3180 assert(m);
3181 assert(manager);
3182
3183 e = sd_bus_message_get_error(m);
3184 if (e) {
3185 log_error_errno(sd_bus_error_get_errno(e),
3186 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3187 e->message);
3188 goto configure;
3189 }
3190
3191 r = sd_bus_message_read_array(m, 'y', &a, &sz);
3192 if (r < 0)
3193 goto configure;
3194
3195 if (sz != sizeof(sd_id128_t)) {
3196 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3197 goto configure;
3198 }
3199
3200 memcpy(&manager->product_uuid, a, sz);
3201 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3202 (void) duid_set_uuid(duid, manager->product_uuid);
3203
3204 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3205
3206 configure:
3207 while ((link = set_steal_first(manager->links_requesting_uuid))) {
3208 r = link_configure(link);
3209 if (r < 0)
3210 log_link_error_errno(link, r, "Failed to configure link: %m");
3211 }
3212
3213 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3214
3215 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3216 * even if the method fails. */
3217 manager->has_product_uuid = true;
3218
3219 return 1;
3220 }
3221
3222 static bool link_requires_uuid(Link *link) {
3223 const DUID *duid;
3224
3225 assert(link);
3226 assert(link->manager);
3227 assert(link->network);
3228
3229 duid = link_get_duid(link);
3230 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3231 return false;
3232
3233 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3234 return true;
3235
3236 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3237 return true;
3238
3239 return false;
3240 }
3241
3242 static int link_configure_duid(Link *link) {
3243 Manager *m;
3244 DUID *duid;
3245 int r;
3246
3247 assert(link);
3248 assert(link->manager);
3249 assert(link->network);
3250
3251 m = link->manager;
3252 duid = link_get_duid(link);
3253
3254 if (!link_requires_uuid(link))
3255 return 1;
3256
3257 if (m->has_product_uuid) {
3258 (void) duid_set_uuid(duid, m->product_uuid);
3259 return 1;
3260 }
3261
3262 if (!m->links_requesting_uuid) {
3263 r = manager_request_product_uuid(m, link);
3264 if (r < 0) {
3265 if (r == -ENOMEM)
3266 return r;
3267
3268 log_link_warning_errno(link, r,
3269 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3270 return 1;
3271 }
3272 } else {
3273 r = set_put(m->links_requesting_uuid, link);
3274 if (r < 0)
3275 return log_oom();
3276
3277 r = set_put(m->duids_requesting_uuid, duid);
3278 if (r < 0)
3279 return log_oom();
3280 }
3281
3282 return 0;
3283 }
3284
3285 static int link_initialized_and_synced(Link *link) {
3286 Network *network;
3287 int r;
3288
3289 assert(link);
3290 assert(link->ifname);
3291 assert(link->manager);
3292
3293 if (link->state != LINK_STATE_PENDING)
3294 return 1;
3295
3296 log_link_debug(link, "Link state is up-to-date");
3297
3298 r = link_new_bound_by_list(link);
3299 if (r < 0)
3300 return r;
3301
3302 r = link_handle_bound_by_list(link);
3303 if (r < 0)
3304 return r;
3305
3306 if (!link->network) {
3307 r = network_get(link->manager, link->sd_device, link->ifname,
3308 &link->mac, &network);
3309 if (r == -ENOENT) {
3310 link_enter_unmanaged(link);
3311 return 1;
3312 } else if (r == 0 && network->unmanaged) {
3313 link_enter_unmanaged(link);
3314 return 0;
3315 } else if (r < 0)
3316 return r;
3317
3318 if (link->flags & IFF_LOOPBACK) {
3319 if (network->link_local != ADDRESS_FAMILY_NO)
3320 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3321
3322 if (network->dhcp != ADDRESS_FAMILY_NO)
3323 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3324
3325 if (network->dhcp_server)
3326 log_link_debug(link, "Ignoring DHCP server for loopback link");
3327 }
3328
3329 r = network_apply(network, link);
3330 if (r < 0)
3331 return r;
3332 }
3333
3334 r = link_new_bound_to_list(link);
3335 if (r < 0)
3336 return r;
3337
3338 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3339 * link_configure() is called later asynchronously. */
3340 r = link_configure_duid(link);
3341 if (r <= 0)
3342 return r;
3343
3344 r = link_configure(link);
3345 if (r < 0)
3346 return r;
3347
3348 return 1;
3349 }
3350
3351 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3352 (void) link_initialized_and_synced(link);
3353 return 1;
3354 }
3355
3356 int link_initialized(Link *link, sd_device *device) {
3357 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3358 int r;
3359
3360 assert(link);
3361 assert(link->manager);
3362 assert(link->manager->rtnl);
3363 assert(device);
3364
3365 if (link->state != LINK_STATE_PENDING)
3366 return 0;
3367
3368 if (link->sd_device)
3369 return 0;
3370
3371 log_link_debug(link, "udev initialized link");
3372
3373 link->sd_device = sd_device_ref(device);
3374
3375 /* udev has initialized the link, but we don't know if we have yet
3376 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3377 * when it returns we know that the pending NEWLINKs have already been
3378 * processed and that we are up-to-date */
3379
3380 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3381 link->ifindex);
3382 if (r < 0)
3383 return r;
3384
3385 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3386 link_netlink_destroy_callback, link);
3387 if (r < 0)
3388 return r;
3389
3390 link_ref(link);
3391
3392 return 0;
3393 }
3394
3395 static int link_load(Link *link) {
3396 _cleanup_free_ char *network_file = NULL,
3397 *addresses = NULL,
3398 *routes = NULL,
3399 *dhcp4_address = NULL,
3400 *ipv4ll_address = NULL;
3401 union in_addr_union address;
3402 union in_addr_union route_dst;
3403 const char *p;
3404 int r;
3405
3406 assert(link);
3407
3408 r = parse_env_file(NULL, link->state_file,
3409 "NETWORK_FILE", &network_file,
3410 "ADDRESSES", &addresses,
3411 "ROUTES", &routes,
3412 "DHCP4_ADDRESS", &dhcp4_address,
3413 "IPV4LL_ADDRESS", &ipv4ll_address);
3414 if (r < 0 && r != -ENOENT)
3415 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3416
3417 if (network_file) {
3418 Network *network;
3419 char *suffix;
3420
3421 /* drop suffix */
3422 suffix = strrchr(network_file, '.');
3423 if (!suffix) {
3424 log_link_debug(link, "Failed to get network name from %s", network_file);
3425 goto network_file_fail;
3426 }
3427 *suffix = '\0';
3428
3429 r = network_get_by_name(link->manager, basename(network_file), &network);
3430 if (r < 0) {
3431 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3432 goto network_file_fail;
3433 }
3434
3435 r = network_apply(network, link);
3436 if (r < 0)
3437 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3438 }
3439
3440 network_file_fail:
3441
3442 if (addresses) {
3443 p = addresses;
3444
3445 for (;;) {
3446 _cleanup_free_ char *address_str = NULL;
3447 char *prefixlen_str;
3448 int family;
3449 unsigned char prefixlen;
3450
3451 r = extract_first_word(&p, &address_str, NULL, 0);
3452 if (r < 0) {
3453 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3454 continue;
3455 }
3456 if (r == 0)
3457 break;
3458
3459 prefixlen_str = strchr(address_str, '/');
3460 if (!prefixlen_str) {
3461 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3462 continue;
3463 }
3464
3465 *prefixlen_str++ = '\0';
3466
3467 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3468 if (r != 1) {
3469 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3470 continue;
3471 }
3472
3473 r = in_addr_from_string_auto(address_str, &family, &address);
3474 if (r < 0) {
3475 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3476 continue;
3477 }
3478
3479 r = address_add(link, family, &address, prefixlen, NULL);
3480 if (r < 0)
3481 return log_link_error_errno(link, r, "Failed to add address: %m");
3482 }
3483 }
3484
3485 if (routes) {
3486 p = routes;
3487
3488 for (;;) {
3489 Route *route;
3490 _cleanup_free_ char *route_str = NULL;
3491 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3492 usec_t lifetime;
3493 char *prefixlen_str;
3494 int family;
3495 unsigned char prefixlen, tos, table;
3496 uint32_t priority;
3497
3498 r = extract_first_word(&p, &route_str, NULL, 0);
3499 if (r < 0) {
3500 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3501 continue;
3502 }
3503 if (r == 0)
3504 break;
3505
3506 prefixlen_str = strchr(route_str, '/');
3507 if (!prefixlen_str) {
3508 log_link_debug(link, "Failed to parse route %s", route_str);
3509 continue;
3510 }
3511
3512 *prefixlen_str++ = '\0';
3513
3514 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3515 if (r != 5) {
3516 log_link_debug(link,
3517 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3518 prefixlen_str);
3519 continue;
3520 }
3521
3522 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3523 if (r < 0) {
3524 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3525 continue;
3526 }
3527
3528 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3529 if (r < 0)
3530 return log_link_error_errno(link, r, "Failed to add route: %m");
3531
3532 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3533 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3534 0, route_expire_handler, route);
3535 if (r < 0)
3536 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3537 }
3538
3539 route->lifetime = lifetime;
3540 sd_event_source_unref(route->expire);
3541 route->expire = TAKE_PTR(expire);
3542 }
3543 }
3544
3545 if (dhcp4_address) {
3546 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3547 if (r < 0) {
3548 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3549 goto dhcp4_address_fail;
3550 }
3551
3552 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3553 if (r < 0)
3554 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3555
3556 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3557 if (r < 0)
3558 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3559 }
3560
3561 dhcp4_address_fail:
3562
3563 if (ipv4ll_address) {
3564 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3565 if (r < 0) {
3566 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3567 goto ipv4ll_address_fail;
3568 }
3569
3570 r = sd_ipv4ll_new(&link->ipv4ll);
3571 if (r < 0)
3572 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3573
3574 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3575 if (r < 0)
3576 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3577 }
3578
3579 ipv4ll_address_fail:
3580
3581 return 0;
3582 }
3583
3584 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3585 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3586 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3587 Link *link;
3588 int r;
3589
3590 assert(m);
3591 assert(m->rtnl);
3592 assert(message);
3593 assert(ret);
3594
3595 r = link_new(m, message, ret);
3596 if (r < 0)
3597 return r;
3598
3599 link = *ret;
3600
3601 log_link_debug(link, "Link %d added", link->ifindex);
3602
3603 r = link_load(link);
3604 if (r < 0)
3605 return r;
3606
3607 if (detect_container() <= 0) {
3608 /* not in a container, udev will be around */
3609 sprintf(ifindex_str, "n%d", link->ifindex);
3610 r = sd_device_new_from_device_id(&device, ifindex_str);
3611 if (r < 0) {
3612 log_link_warning_errno(link, r, "Could not find device: %m");
3613 goto failed;
3614 }
3615
3616 r = sd_device_get_is_initialized(device);
3617 if (r < 0) {
3618 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3619 goto failed;
3620 }
3621 if (r == 0) {
3622 /* not yet ready */
3623 log_link_debug(link, "link pending udev initialization...");
3624 return 0;
3625 }
3626
3627 r = link_initialized(link, device);
3628 if (r < 0)
3629 goto failed;
3630 } else {
3631 r = link_initialized_and_synced(link);
3632 if (r < 0)
3633 goto failed;
3634 }
3635
3636 return 0;
3637 failed:
3638 link_enter_failed(link);
3639 return r;
3640 }
3641
3642 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3643 int r;
3644
3645 assert(link);
3646
3647 log_link_info(link, "Gained IPv6LL");
3648
3649 link->ipv6ll_address = *address;
3650 link_check_ready(link);
3651
3652 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3653 r = link_acquire_ipv6_conf(link);
3654 if (r < 0) {
3655 link_enter_failed(link);
3656 return r;
3657 }
3658 }
3659
3660 return 0;
3661 }
3662
3663 static int link_carrier_gained(Link *link) {
3664 int r;
3665
3666 assert(link);
3667
3668 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3669 r = link_acquire_conf(link);
3670 if (r < 0) {
3671 link_enter_failed(link);
3672 return r;
3673 }
3674
3675 r = link_request_set_addresses(link);
3676 if (r < 0)
3677 return r;
3678 }
3679
3680 r = link_handle_bound_by_list(link);
3681 if (r < 0)
3682 return r;
3683
3684 return 0;
3685 }
3686
3687 static int link_carrier_lost(Link *link) {
3688 int r;
3689
3690 assert(link);
3691
3692 if (link->network && link->network->ignore_carrier_loss)
3693 return 0;
3694
3695 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3696 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3697 * configuration and stop the clients as well. */
3698 if (link->setting_mtu)
3699 return 0;
3700
3701 r = link_stop_clients(link);
3702 if (r < 0) {
3703 link_enter_failed(link);
3704 return r;
3705 }
3706
3707 if (link_dhcp4_server_enabled(link))
3708 (void) sd_dhcp_server_stop(link->dhcp_server);
3709
3710 r = link_drop_config(link);
3711 if (r < 0)
3712 return r;
3713
3714 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3715 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3716 r = link_drop_foreign_config(link);
3717 if (r < 0)
3718 return r;
3719 }
3720
3721 r = link_handle_bound_by_list(link);
3722 if (r < 0)
3723 return r;
3724
3725 return 0;
3726 }
3727
3728 int link_carrier_reset(Link *link) {
3729 int r;
3730
3731 assert(link);
3732
3733 if (link_has_carrier(link)) {
3734 r = link_carrier_lost(link);
3735 if (r < 0)
3736 return r;
3737
3738 r = link_carrier_gained(link);
3739 if (r < 0)
3740 return r;
3741
3742 log_link_info(link, "Reset carrier");
3743 }
3744
3745 return 0;
3746 }
3747
3748 int link_update(Link *link, sd_netlink_message *m) {
3749 struct ether_addr mac;
3750 const char *ifname;
3751 uint32_t mtu;
3752 bool had_carrier, carrier_gained, carrier_lost;
3753 int r;
3754
3755 assert(link);
3756 assert(link->ifname);
3757 assert(m);
3758
3759 if (link->state == LINK_STATE_LINGER) {
3760 log_link_info(link, "Link readded");
3761 link_set_state(link, LINK_STATE_CONFIGURING);
3762
3763 r = link_new_carrier_maps(link);
3764 if (r < 0)
3765 return r;
3766 }
3767
3768 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3769 if (r >= 0 && !streq(ifname, link->ifname)) {
3770 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3771
3772 if (link->state == LINK_STATE_PENDING) {
3773 r = free_and_strdup(&link->ifname, ifname);
3774 if (r < 0)
3775 return r;
3776 } else {
3777 Manager *manager = link->manager;
3778
3779 link_drop(link);
3780 r = link_add(manager, m, &link);
3781 if (r < 0)
3782 return r;
3783 }
3784 }
3785
3786 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3787 if (r >= 0 && mtu > 0) {
3788 link->mtu = mtu;
3789 if (link->original_mtu == 0) {
3790 link->original_mtu = mtu;
3791 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3792 }
3793
3794 if (link->dhcp_client) {
3795 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3796 link->mtu);
3797 if (r < 0)
3798 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3799 }
3800
3801 if (link->radv) {
3802 r = sd_radv_set_mtu(link->radv, link->mtu);
3803 if (r < 0)
3804 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3805 }
3806 }
3807
3808 /* The kernel may broadcast NEWLINK messages without the MAC address
3809 set, simply ignore them. */
3810 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3811 if (r >= 0) {
3812 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3813 ETH_ALEN)) {
3814
3815 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3816 ETH_ALEN);
3817
3818 log_link_debug(link, "MAC address: "
3819 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3820 mac.ether_addr_octet[0],
3821 mac.ether_addr_octet[1],
3822 mac.ether_addr_octet[2],
3823 mac.ether_addr_octet[3],
3824 mac.ether_addr_octet[4],
3825 mac.ether_addr_octet[5]);
3826
3827 if (link->ipv4ll) {
3828 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3829 if (r < 0)
3830 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3831 }
3832
3833 if (link->dhcp_client) {
3834 r = sd_dhcp_client_set_mac(link->dhcp_client,
3835 (const uint8_t *) &link->mac,
3836 sizeof (link->mac),
3837 ARPHRD_ETHER);
3838 if (r < 0)
3839 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3840
3841 r = dhcp4_set_client_identifier(link);
3842 if (r < 0)
3843 return r;
3844 }
3845
3846 if (link->dhcp6_client) {
3847 const DUID* duid = link_get_duid(link);
3848
3849 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3850 (const uint8_t *) &link->mac,
3851 sizeof (link->mac),
3852 ARPHRD_ETHER);
3853 if (r < 0)
3854 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3855
3856 if (link->network->iaid_set) {
3857 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3858 link->network->iaid);
3859 if (r < 0)
3860 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3861 }
3862
3863 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3864 duid->type,
3865 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3866 duid->raw_data_len);
3867 if (r < 0)
3868 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3869 }
3870
3871 if (link->radv) {
3872 r = sd_radv_set_mac(link->radv, &link->mac);
3873 if (r < 0)
3874 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3875 }
3876
3877 if (link->ndisc) {
3878 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3879 if (r < 0)
3880 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3881 }
3882 }
3883 }
3884
3885 had_carrier = link_has_carrier(link);
3886
3887 r = link_update_flags(link, m);
3888 if (r < 0)
3889 return r;
3890
3891 r = link_update_lldp(link);
3892 if (r < 0)
3893 return r;
3894
3895 carrier_gained = !had_carrier && link_has_carrier(link);
3896 carrier_lost = had_carrier && !link_has_carrier(link);
3897
3898 if (carrier_gained) {
3899 log_link_info(link, "Gained carrier");
3900
3901 r = link_carrier_gained(link);
3902 if (r < 0)
3903 return r;
3904 } else if (carrier_lost) {
3905 log_link_info(link, "Lost carrier");
3906
3907 r = link_carrier_lost(link);
3908 if (r < 0)
3909 return r;
3910 }
3911
3912 return 0;
3913 }
3914
3915 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3916 bool space = false;
3917 Iterator i;
3918 Link *link;
3919
3920 assert(f);
3921 assert(prefix);
3922
3923 if (hashmap_isempty(h))
3924 return;
3925
3926 fputs(prefix, f);
3927 HASHMAP_FOREACH(link, h, i) {
3928 if (space)
3929 fputc(' ', f);
3930
3931 fprintf(f, "%i", link->ifindex);
3932 space = true;
3933 }
3934
3935 fputc('\n', f);
3936 }
3937
3938 int link_save(Link *link) {
3939 _cleanup_free_ char *temp_path = NULL;
3940 _cleanup_fclose_ FILE *f = NULL;
3941 const char *admin_state, *oper_state;
3942 Address *a;
3943 Route *route;
3944 Iterator i;
3945 int r;
3946
3947 assert(link);
3948 assert(link->state_file);
3949 assert(link->lease_file);
3950 assert(link->manager);
3951
3952 if (link->state == LINK_STATE_LINGER) {
3953 unlink(link->state_file);
3954 return 0;
3955 }
3956
3957 link_lldp_save(link);
3958
3959 admin_state = link_state_to_string(link->state);
3960 assert(admin_state);
3961
3962 oper_state = link_operstate_to_string(link->operstate);
3963 assert(oper_state);
3964
3965 r = fopen_temporary(link->state_file, &f, &temp_path);
3966 if (r < 0)
3967 goto fail;
3968
3969 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
3970 (void) fchmod(fileno(f), 0644);
3971
3972 fprintf(f,
3973 "# This is private data. Do not parse.\n"
3974 "ADMIN_STATE=%s\n"
3975 "OPER_STATE=%s\n",
3976 admin_state, oper_state);
3977
3978 if (link->network) {
3979 bool space;
3980 sd_dhcp6_lease *dhcp6_lease = NULL;
3981 const char *dhcp_domainname = NULL;
3982 char **dhcp6_domains = NULL;
3983 char **dhcp_domains = NULL;
3984 unsigned j;
3985
3986 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3987 yes_no(link->network->required_for_online));
3988
3989 if (link->dhcp6_client) {
3990 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3991 if (r < 0 && r != -ENOMSG)
3992 log_link_debug(link, "No DHCPv6 lease");
3993 }
3994
3995 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3996
3997 fputs("DNS=", f);
3998 space = false;
3999
4000 for (j = 0; j < link->network->n_dns; j++) {
4001 _cleanup_free_ char *b = NULL;
4002
4003 r = in_addr_to_string(link->network->dns[j].family,
4004 &link->network->dns[j].address, &b);
4005 if (r < 0) {
4006 log_debug_errno(r, "Failed to format address, ignoring: %m");
4007 continue;
4008 }
4009
4010 if (space)
4011 fputc(' ', f);
4012 fputs(b, f);
4013 space = true;
4014 }
4015
4016 if (link->network->dhcp_use_dns &&
4017 link->dhcp_lease) {
4018 const struct in_addr *addresses;
4019
4020 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
4021 if (r > 0)
4022 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4023 space = true;
4024 }
4025
4026 if (link->network->dhcp_use_dns && dhcp6_lease) {
4027 struct in6_addr *in6_addrs;
4028
4029 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
4030 if (r > 0) {
4031 if (space)
4032 fputc(' ', f);
4033 serialize_in6_addrs(f, in6_addrs, r);
4034 space = true;
4035 }
4036 }
4037
4038 /* Make sure to flush out old entries before we use the NDISC data */
4039 ndisc_vacuum(link);
4040
4041 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4042 NDiscRDNSS *dd;
4043
4044 SET_FOREACH(dd, link->ndisc_rdnss, i) {
4045 if (space)
4046 fputc(' ', f);
4047
4048 serialize_in6_addrs(f, &dd->address, 1);
4049 space = true;
4050 }
4051 }
4052
4053 fputc('\n', f);
4054
4055 fputs("NTP=", f);
4056 space = false;
4057 fputstrv(f, link->network->ntp, NULL, &space);
4058
4059 if (link->network->dhcp_use_ntp &&
4060 link->dhcp_lease) {
4061 const struct in_addr *addresses;
4062
4063 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
4064 if (r > 0)
4065 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4066 space = true;
4067 }
4068
4069 if (link->network->dhcp_use_ntp && dhcp6_lease) {
4070 struct in6_addr *in6_addrs;
4071 char **hosts;
4072
4073 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
4074 &in6_addrs);
4075 if (r > 0) {
4076 if (space)
4077 fputc(' ', f);
4078 serialize_in6_addrs(f, in6_addrs, r);
4079 space = true;
4080 }
4081
4082 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
4083 if (r > 0)
4084 fputstrv(f, hosts, NULL, &space);
4085 }
4086
4087 fputc('\n', f);
4088
4089 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4090 if (link->dhcp_lease) {
4091 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4092 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4093 }
4094 if (dhcp6_lease)
4095 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4096 }
4097
4098 ordered_set_print(f, "DOMAINS=", link->network->search_domains);
4099
4100 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4101 NDiscDNSSL *dd;
4102
4103 if (dhcp_domainname)
4104 fputs_with_space(f, dhcp_domainname, NULL, &space);
4105 if (dhcp_domains)
4106 fputstrv(f, dhcp_domains, NULL, &space);
4107 if (dhcp6_domains)
4108 fputstrv(f, dhcp6_domains, NULL, &space);
4109
4110 SET_FOREACH(dd, link->ndisc_dnssl, i)
4111 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4112 }
4113
4114 fputc('\n', f);
4115
4116 ordered_set_print(f, "ROUTE_DOMAINS=", link->network->route_domains);
4117
4118 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4119 NDiscDNSSL *dd;
4120
4121 if (dhcp_domainname)
4122 fputs_with_space(f, dhcp_domainname, NULL, &space);
4123 if (dhcp_domains)
4124 fputstrv(f, dhcp_domains, NULL, &space);
4125 if (dhcp6_domains)
4126 fputstrv(f, dhcp6_domains, NULL, &space);
4127
4128 SET_FOREACH(dd, link->ndisc_dnssl, i)
4129 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4130 }
4131
4132 fputc('\n', f);
4133
4134 fprintf(f, "LLMNR=%s\n",
4135 resolve_support_to_string(link->network->llmnr));
4136 fprintf(f, "MDNS=%s\n",
4137 resolve_support_to_string(link->network->mdns));
4138 if (link->network->dns_default_route >= 0)
4139 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
4140
4141 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4142 fprintf(f, "DNS_OVER_TLS=%s\n",
4143 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
4144
4145 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
4146 fprintf(f, "DNSSEC=%s\n",
4147 dnssec_mode_to_string(link->network->dnssec_mode));
4148
4149 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
4150 const char *n;
4151
4152 fputs("DNSSEC_NTA=", f);
4153 space = false;
4154 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
4155 fputs_with_space(f, n, NULL, &space);
4156 fputc('\n', f);
4157 }
4158
4159 fputs("ADDRESSES=", f);
4160 space = false;
4161 SET_FOREACH(a, link->addresses, i) {
4162 _cleanup_free_ char *address_str = NULL;
4163
4164 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4165 if (r < 0)
4166 goto fail;
4167
4168 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4169 space = true;
4170 }
4171 fputc('\n', f);
4172
4173 fputs("ROUTES=", f);
4174 space = false;
4175 SET_FOREACH(route, link->routes, i) {
4176 _cleanup_free_ char *route_str = NULL;
4177
4178 r = in_addr_to_string(route->family, &route->dst, &route_str);
4179 if (r < 0)
4180 goto fail;
4181
4182 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4183 space ? " " : "", route_str,
4184 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4185 space = true;
4186 }
4187
4188 fputc('\n', f);
4189 }
4190
4191 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4192 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4193
4194 if (link->dhcp_lease) {
4195 struct in_addr address;
4196 const char *tz = NULL;
4197
4198 assert(link->network);
4199
4200 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
4201 if (r >= 0)
4202 fprintf(f, "TIMEZONE=%s\n", tz);
4203
4204 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
4205 if (r >= 0) {
4206 fputs("DHCP4_ADDRESS=", f);
4207 serialize_in_addrs(f, &address, 1, false, NULL);
4208 fputc('\n', f);
4209 }
4210
4211 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4212 if (r < 0)
4213 goto fail;
4214
4215 fprintf(f,
4216 "DHCP_LEASE=%s\n",
4217 link->lease_file);
4218 } else
4219 unlink(link->lease_file);
4220
4221 if (link->ipv4ll) {
4222 struct in_addr address;
4223
4224 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4225 if (r >= 0) {
4226 fputs("IPV4LL_ADDRESS=", f);
4227 serialize_in_addrs(f, &address, 1, false, NULL);
4228 fputc('\n', f);
4229 }
4230 }
4231
4232 r = fflush_and_check(f);
4233 if (r < 0)
4234 goto fail;
4235
4236 if (rename(temp_path, link->state_file) < 0) {
4237 r = -errno;
4238 goto fail;
4239 }
4240
4241 return 0;
4242
4243 fail:
4244 (void) unlink(link->state_file);
4245 if (temp_path)
4246 (void) unlink(temp_path);
4247
4248 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4249 }
4250
4251 /* The serialized state in /run is no longer up-to-date. */
4252 void link_dirty(Link *link) {
4253 int r;
4254
4255 assert(link);
4256
4257 /* mark manager dirty as link is dirty */
4258 manager_dirty(link->manager);
4259
4260 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
4261 if (r < 0)
4262 /* allocation errors are ignored */
4263 return;
4264
4265 r = set_put(link->manager->dirty_links, link);
4266 if (r <= 0)
4267 /* don't take another ref if the link was already dirty */
4268 return;
4269
4270 link_ref(link);
4271 }
4272
4273 /* The serialized state in /run is up-to-date */
4274 void link_clean(Link *link) {
4275 assert(link);
4276 assert(link->manager);
4277
4278 link_unref(set_remove(link->manager->dirty_links, link));
4279 }
4280
4281 static const char* const link_state_table[_LINK_STATE_MAX] = {
4282 [LINK_STATE_PENDING] = "pending",
4283 [LINK_STATE_CONFIGURING] = "configuring",
4284 [LINK_STATE_CONFIGURED] = "configured",
4285 [LINK_STATE_UNMANAGED] = "unmanaged",
4286 [LINK_STATE_FAILED] = "failed",
4287 [LINK_STATE_LINGER] = "linger",
4288 };
4289
4290 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
4291
4292 static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
4293 [LINK_OPERSTATE_OFF] = "off",
4294 [LINK_OPERSTATE_NO_CARRIER] = "no-carrier",
4295 [LINK_OPERSTATE_DORMANT] = "dormant",
4296 [LINK_OPERSTATE_CARRIER] = "carrier",
4297 [LINK_OPERSTATE_DEGRADED] = "degraded",
4298 [LINK_OPERSTATE_ENSLAVED] = "enslaved",
4299 [LINK_OPERSTATE_ROUTABLE] = "routable",
4300 };
4301
4302 DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
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