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Merge pull request #11861 from yuwata/network-verify-2
[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 "udev-util.h"
35 #include "util.h"
36 #include "virt.h"
37
38 uint32_t link_get_vrf_table(Link *link) {
39 return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
40 }
41
42 uint32_t link_get_dhcp_route_table(Link *link) {
43 /* When the interface is part of an VRF use the VRFs routing table, unless
44 * another table is explicitly specified. */
45 if (link->network->dhcp_route_table_set)
46 return link->network->dhcp_route_table;
47 return link_get_vrf_table(link);
48 }
49
50 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
51 if (link->network->ipv6_accept_ra_route_table_set)
52 return link->network->ipv6_accept_ra_route_table;
53 return link_get_vrf_table(link);
54 }
55
56 DUID* link_get_duid(Link *link) {
57 if (link->network->duid.type != _DUID_TYPE_INVALID)
58 return &link->network->duid;
59 else
60 return &link->manager->duid;
61 }
62
63 static bool link_dhcp6_enabled(Link *link) {
64 assert(link);
65
66 if (!socket_ipv6_is_supported())
67 return false;
68
69 if (link->flags & IFF_LOOPBACK)
70 return false;
71
72 if (!link->network)
73 return false;
74
75 if (link->network->bond)
76 return false;
77
78 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
79 return false;
80
81 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
82 }
83
84 static bool link_dhcp4_enabled(Link *link) {
85 assert(link);
86
87 if (link->flags & IFF_LOOPBACK)
88 return false;
89
90 if (!link->network)
91 return false;
92
93 if (link->network->bond)
94 return false;
95
96 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
97 }
98
99 static bool link_dhcp4_server_enabled(Link *link) {
100 assert(link);
101
102 if (link->flags & IFF_LOOPBACK)
103 return false;
104
105 if (!link->network)
106 return false;
107
108 if (link->network->bond)
109 return false;
110
111 return link->network->dhcp_server;
112 }
113
114 static bool link_ipv4ll_enabled(Link *link) {
115 assert(link);
116
117 if (link->flags & IFF_LOOPBACK)
118 return false;
119
120 if (!link->network)
121 return false;
122
123 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard"))
124 return false;
125
126 if (link->network->bond)
127 return false;
128
129 return link->network->link_local & ADDRESS_FAMILY_IPV4;
130 }
131
132 static bool link_ipv6ll_enabled(Link *link) {
133 assert(link);
134
135 if (!socket_ipv6_is_supported())
136 return false;
137
138 if (link->flags & IFF_LOOPBACK)
139 return false;
140
141 if (!link->network)
142 return false;
143
144 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard"))
145 return false;
146
147 if (link->network->bond)
148 return false;
149
150 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
151 return false;
152
153 return link->network->link_local & ADDRESS_FAMILY_IPV6;
154 }
155
156 static bool link_ipv6_enabled(Link *link) {
157 assert(link);
158
159 if (!socket_ipv6_is_supported())
160 return false;
161
162 if (link->network->bond)
163 return false;
164
165 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
166 return false;
167
168 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
169 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
170 }
171
172 static bool link_radv_enabled(Link *link) {
173 assert(link);
174
175 if (!link_ipv6ll_enabled(link))
176 return false;
177
178 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
179 }
180
181 static bool link_lldp_rx_enabled(Link *link) {
182 assert(link);
183
184 if (link->flags & IFF_LOOPBACK)
185 return false;
186
187 if (link->iftype != ARPHRD_ETHER)
188 return false;
189
190 if (!link->network)
191 return false;
192
193 /* LLDP should be handled on bridge slaves as those have a direct
194 * connection to their peers not on the bridge master. Linux doesn't
195 * even (by default) forward lldp packets to the bridge master.*/
196 if (streq_ptr("bridge", link->kind))
197 return false;
198
199 return link->network->lldp_mode != LLDP_MODE_NO;
200 }
201
202 static bool link_lldp_emit_enabled(Link *link) {
203 assert(link);
204
205 if (link->flags & IFF_LOOPBACK)
206 return false;
207
208 if (link->iftype != ARPHRD_ETHER)
209 return false;
210
211 if (!link->network)
212 return false;
213
214 return link->network->lldp_emit != LLDP_EMIT_NO;
215 }
216
217 static bool link_ipv4_forward_enabled(Link *link) {
218 assert(link);
219
220 if (link->flags & IFF_LOOPBACK)
221 return false;
222
223 if (!link->network)
224 return false;
225
226 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
227 return false;
228
229 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
230 }
231
232 static bool link_ipv6_forward_enabled(Link *link) {
233 assert(link);
234
235 if (!socket_ipv6_is_supported())
236 return false;
237
238 if (link->flags & IFF_LOOPBACK)
239 return false;
240
241 if (!link->network)
242 return false;
243
244 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
245 return false;
246
247 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
248 return false;
249
250 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
251 }
252
253 static bool link_proxy_arp_enabled(Link *link) {
254 assert(link);
255
256 if (link->flags & IFF_LOOPBACK)
257 return false;
258
259 if (!link->network)
260 return false;
261
262 if (link->network->proxy_arp < 0)
263 return false;
264
265 return true;
266 }
267
268 static bool link_ipv6_accept_ra_enabled(Link *link) {
269 assert(link);
270
271 if (!socket_ipv6_is_supported())
272 return false;
273
274 if (link->flags & IFF_LOOPBACK)
275 return false;
276
277 if (!link->network)
278 return false;
279
280 if (!link_ipv6ll_enabled(link))
281 return false;
282
283 /* If unset use system default (enabled if local forwarding is disabled.
284 * disabled if local forwarding is enabled).
285 * If set, ignore or enforce RA independent of local forwarding state.
286 */
287 if (link->network->ipv6_accept_ra < 0)
288 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
289 return !link_ipv6_forward_enabled(link);
290 else if (link->network->ipv6_accept_ra > 0)
291 /* accept RA even if ip_forward is enabled */
292 return true;
293 else
294 /* ignore RA */
295 return false;
296 }
297
298 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
299 assert(link);
300
301 if (!socket_ipv6_is_supported())
302 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
303
304 if (link->flags & IFF_LOOPBACK)
305 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
306
307 if (!link->network)
308 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
309
310 return link->network->ipv6_privacy_extensions;
311 }
312
313 static int link_enable_ipv6(Link *link) {
314 bool disabled;
315 int r;
316
317 if (link->flags & IFF_LOOPBACK)
318 return 0;
319
320 disabled = !link_ipv6_enabled(link);
321
322 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", disabled);
323 if (r < 0)
324 log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m",
325 enable_disable(!disabled), link->ifname);
326 else
327 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
328
329 return 0;
330 }
331
332 static bool link_is_enslaved(Link *link) {
333 if (link->flags & IFF_SLAVE)
334 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
335 return true;
336
337 if (!link->enslaved_raw)
338 return false;
339
340 if (!link->network)
341 return false;
342
343 if (link->network->bridge)
344 /* TODO: support the case when link is not managed by networkd. */
345 return true;
346
347 return false;
348 }
349
350 static void link_update_master_operstate(Link *link, NetDev *netdev) {
351 Link *master;
352
353 if (!netdev)
354 return;
355
356 if (link_get(link->manager, netdev->ifindex, &master) < 0)
357 return;
358
359 link_update_operstate(master, true);
360 }
361
362 void link_update_operstate(Link *link, bool also_update_master) {
363 LinkOperationalState operstate;
364 Iterator i;
365
366 assert(link);
367
368 if (link->kernel_operstate == IF_OPER_DORMANT)
369 operstate = LINK_OPERSTATE_DORMANT;
370 else if (link_has_carrier(link)) {
371 Address *address;
372 uint8_t scope = RT_SCOPE_NOWHERE;
373
374 /* if we have carrier, check what addresses we have */
375 SET_FOREACH(address, link->addresses, i) {
376 if (!address_is_ready(address))
377 continue;
378
379 if (address->scope < scope)
380 scope = address->scope;
381 }
382
383 /* for operstate we also take foreign addresses into account */
384 SET_FOREACH(address, link->addresses_foreign, i) {
385 if (!address_is_ready(address))
386 continue;
387
388 if (address->scope < scope)
389 scope = address->scope;
390 }
391
392 if (scope < RT_SCOPE_SITE)
393 /* universally accessible addresses found */
394 operstate = LINK_OPERSTATE_ROUTABLE;
395 else if (scope < RT_SCOPE_HOST)
396 /* only link or site local addresses found */
397 operstate = LINK_OPERSTATE_DEGRADED;
398 else
399 /* no useful addresses found */
400 operstate = LINK_OPERSTATE_CARRIER;
401 } else if (link->flags & IFF_UP)
402 operstate = LINK_OPERSTATE_NO_CARRIER;
403 else
404 operstate = LINK_OPERSTATE_OFF;
405
406 if (IN_SET(operstate, LINK_OPERSTATE_DEGRADED, LINK_OPERSTATE_CARRIER) &&
407 link_is_enslaved(link))
408 operstate = LINK_OPERSTATE_ENSLAVED;
409
410 if (operstate >= LINK_OPERSTATE_CARRIER) {
411 Link *slave;
412
413 HASHMAP_FOREACH(slave, link->slaves, i) {
414 link_update_operstate(slave, false);
415
416 if (slave->operstate < LINK_OPERSTATE_CARRIER)
417 operstate = LINK_OPERSTATE_DEGRADED_CARRIER;
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 if (link->network->can_triple_sampling >= 0) {
2166 struct can_ctrlmode cm = {
2167 .mask = CAN_CTRLMODE_3_SAMPLES,
2168 .flags = link->network->can_triple_sampling ? CAN_CTRLMODE_3_SAMPLES : 0,
2169 };
2170
2171 log_link_debug(link, "%sabling triple-sampling", link->network->can_triple_sampling ? "En" : "Dis");
2172
2173 r = sd_netlink_message_append_data(m, IFLA_CAN_CTRLMODE, &cm, sizeof(cm));
2174 if (r < 0)
2175 return log_link_error_errno(link, r, "Could not append IFLA_CAN_CTRLMODE attribute: %m");
2176 }
2177
2178 r = sd_netlink_message_close_container(m);
2179 if (r < 0)
2180 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2181
2182 r = sd_netlink_message_close_container(m);
2183 if (r < 0)
2184 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2185
2186 r = netlink_call_async(link->manager->rtnl, NULL, m, link_set_handler,
2187 link_netlink_destroy_callback, link);
2188 if (r < 0)
2189 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2190
2191 link_ref(link);
2192
2193 if (!(link->flags & IFF_UP)) {
2194 r = link_up_can(link);
2195 if (r < 0) {
2196 link_enter_failed(link);
2197 return r;
2198 }
2199 }
2200
2201 log_link_debug(link, "link_set_can done");
2202
2203 return r;
2204 }
2205
2206 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2207 int r;
2208
2209 assert(link);
2210
2211 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2212 return 1;
2213
2214 r = sd_netlink_message_get_errno(m);
2215 if (r < 0)
2216 log_link_warning_errno(link, r, "Could not bring down interface: %m");
2217
2218 if (streq_ptr(link->kind, "can"))
2219 link_set_can(link);
2220
2221 return 1;
2222 }
2223
2224 int link_down(Link *link) {
2225 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2226 int r;
2227
2228 assert(link);
2229 assert(link->manager);
2230 assert(link->manager->rtnl);
2231
2232 log_link_debug(link, "Bringing link down");
2233
2234 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
2235 RTM_SETLINK, link->ifindex);
2236 if (r < 0)
2237 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2238
2239 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
2240 if (r < 0)
2241 return log_link_error_errno(link, r, "Could not set link flags: %m");
2242
2243 r = netlink_call_async(link->manager->rtnl, NULL, req, link_down_handler,
2244 link_netlink_destroy_callback, link);
2245 if (r < 0)
2246 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2247
2248 link_ref(link);
2249
2250 return 0;
2251 }
2252
2253 static int link_handle_bound_to_list(Link *link) {
2254 Link *l;
2255 Iterator i;
2256 int r;
2257 bool required_up = false;
2258 bool link_is_up = false;
2259
2260 assert(link);
2261
2262 if (hashmap_isempty(link->bound_to_links))
2263 return 0;
2264
2265 if (link->flags & IFF_UP)
2266 link_is_up = true;
2267
2268 HASHMAP_FOREACH (l, link->bound_to_links, i)
2269 if (link_has_carrier(l)) {
2270 required_up = true;
2271 break;
2272 }
2273
2274 if (!required_up && link_is_up) {
2275 r = link_down(link);
2276 if (r < 0)
2277 return r;
2278 } else if (required_up && !link_is_up) {
2279 r = link_up(link);
2280 if (r < 0)
2281 return r;
2282 }
2283
2284 return 0;
2285 }
2286
2287 static int link_handle_bound_by_list(Link *link) {
2288 Iterator i;
2289 Link *l;
2290 int r;
2291
2292 assert(link);
2293
2294 if (hashmap_isempty(link->bound_by_links))
2295 return 0;
2296
2297 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2298 r = link_handle_bound_to_list(l);
2299 if (r < 0)
2300 return r;
2301 }
2302
2303 return 0;
2304 }
2305
2306 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2307 int r;
2308
2309 assert(link);
2310 assert(carrier);
2311
2312 if (link == carrier)
2313 return 0;
2314
2315 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2316 return 0;
2317
2318 r = hashmap_ensure_allocated(h, NULL);
2319 if (r < 0)
2320 return r;
2321
2322 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2323 if (r < 0)
2324 return r;
2325
2326 return 0;
2327 }
2328
2329 static int link_new_bound_by_list(Link *link) {
2330 Manager *m;
2331 Link *carrier;
2332 Iterator i;
2333 int r;
2334 bool list_updated = false;
2335
2336 assert(link);
2337 assert(link->manager);
2338
2339 m = link->manager;
2340
2341 HASHMAP_FOREACH(carrier, m->links, i) {
2342 if (!carrier->network)
2343 continue;
2344
2345 if (strv_isempty(carrier->network->bind_carrier))
2346 continue;
2347
2348 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2349 r = link_put_carrier(link, carrier, &link->bound_by_links);
2350 if (r < 0)
2351 return r;
2352
2353 list_updated = true;
2354 }
2355 }
2356
2357 if (list_updated)
2358 link_dirty(link);
2359
2360 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2361 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2362 if (r < 0)
2363 return r;
2364
2365 link_dirty(carrier);
2366 }
2367
2368 return 0;
2369 }
2370
2371 static int link_new_bound_to_list(Link *link) {
2372 Manager *m;
2373 Link *carrier;
2374 Iterator i;
2375 int r;
2376 bool list_updated = false;
2377
2378 assert(link);
2379 assert(link->manager);
2380
2381 if (!link->network)
2382 return 0;
2383
2384 if (strv_isempty(link->network->bind_carrier))
2385 return 0;
2386
2387 m = link->manager;
2388
2389 HASHMAP_FOREACH (carrier, m->links, i) {
2390 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2391 r = link_put_carrier(link, carrier, &link->bound_to_links);
2392 if (r < 0)
2393 return r;
2394
2395 list_updated = true;
2396 }
2397 }
2398
2399 if (list_updated)
2400 link_dirty(link);
2401
2402 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2403 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2404 if (r < 0)
2405 return r;
2406
2407 link_dirty(carrier);
2408 }
2409
2410 return 0;
2411 }
2412
2413 static int link_new_carrier_maps(Link *link) {
2414 int r;
2415
2416 r = link_new_bound_by_list(link);
2417 if (r < 0)
2418 return r;
2419
2420 r = link_handle_bound_by_list(link);
2421 if (r < 0)
2422 return r;
2423
2424 r = link_new_bound_to_list(link);
2425 if (r < 0)
2426 return r;
2427
2428 r = link_handle_bound_to_list(link);
2429 if (r < 0)
2430 return r;
2431
2432 return 0;
2433 }
2434
2435 static void link_free_bound_to_list(Link *link) {
2436 Link *bound_to;
2437 Iterator i;
2438
2439 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2440 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2441
2442 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2443 link_dirty(bound_to);
2444 }
2445
2446 return;
2447 }
2448
2449 static void link_free_bound_by_list(Link *link) {
2450 Link *bound_by;
2451 Iterator i;
2452
2453 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2454 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2455
2456 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2457 link_dirty(bound_by);
2458 link_handle_bound_to_list(bound_by);
2459 }
2460 }
2461
2462 return;
2463 }
2464
2465 static void link_free_carrier_maps(Link *link) {
2466 bool list_updated = false;
2467
2468 assert(link);
2469
2470 if (!hashmap_isempty(link->bound_to_links)) {
2471 link_free_bound_to_list(link);
2472 list_updated = true;
2473 }
2474
2475 if (!hashmap_isempty(link->bound_by_links)) {
2476 link_free_bound_by_list(link);
2477 list_updated = true;
2478 }
2479
2480 if (list_updated)
2481 link_dirty(link);
2482
2483 return;
2484 }
2485
2486 void link_drop(Link *link) {
2487 if (!link || link->state == LINK_STATE_LINGER)
2488 return;
2489
2490 link_set_state(link, LINK_STATE_LINGER);
2491
2492 link_free_carrier_maps(link);
2493
2494 log_link_debug(link, "Link removed");
2495
2496 (void) unlink(link->state_file);
2497
2498 link_detach_from_manager(link);
2499
2500 link_unref(link);
2501
2502 return;
2503 }
2504
2505 static int link_joined(Link *link) {
2506 int r;
2507
2508 assert(link);
2509 assert(link->network);
2510
2511 if (!hashmap_isempty(link->bound_to_links)) {
2512 r = link_handle_bound_to_list(link);
2513 if (r < 0)
2514 return r;
2515 } else if (!(link->flags & IFF_UP)) {
2516 r = link_up(link);
2517 if (r < 0) {
2518 link_enter_failed(link);
2519 return r;
2520 }
2521 }
2522
2523 if (link->network->bridge) {
2524 r = link_set_bridge(link);
2525 if (r < 0)
2526 log_link_error_errno(link, r, "Could not set bridge message: %m");
2527
2528 r = link_append_to_master(link, link->network->bridge);
2529 if (r < 0)
2530 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2531 }
2532
2533 if (link->network->bond) {
2534 r = link_set_bond(link);
2535 if (r < 0)
2536 log_link_error_errno(link, r, "Could not set bond message: %m");
2537
2538 r = link_append_to_master(link, link->network->bond);
2539 if (r < 0)
2540 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2541 }
2542
2543 if (link->network->use_br_vlan &&
2544 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2545 r = link_set_bridge_vlan(link);
2546 if (r < 0)
2547 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2548 }
2549
2550 /* Skip setting up addresses until it gets carrier,
2551 or it would try to set addresses twice,
2552 which is bad for non-idempotent steps. */
2553 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2554 return 0;
2555
2556 return link_request_set_addresses(link);
2557 }
2558
2559 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2560 int r;
2561
2562 assert(link);
2563 assert(link->network);
2564 assert(link->enslaving > 0);
2565 assert(!link->enslaved_raw);
2566
2567 link->enslaving--;
2568
2569 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2570 return 1;
2571
2572 r = sd_netlink_message_get_errno(m);
2573 if (r < 0 && r != -EEXIST) {
2574 log_link_error_errno(link, r, "Could not join netdev: %m");
2575 link_enter_failed(link);
2576 return 1;
2577 } else
2578 log_link_debug(link, "Joined netdev");
2579
2580 if (link->enslaving == 0) {
2581 link->enslaved_raw = true;
2582 link_joined(link);
2583 }
2584
2585 return 1;
2586 }
2587
2588 static int link_enter_join_netdev(Link *link) {
2589 NetDev *netdev;
2590 Iterator i;
2591 int r;
2592
2593 assert(link);
2594 assert(link->network);
2595 assert(link->state == LINK_STATE_PENDING);
2596
2597 link_set_state(link, LINK_STATE_CONFIGURING);
2598
2599 link_dirty(link);
2600 link->enslaving = 0;
2601 link->enslaved_raw = false;
2602
2603 if (link->network->bond) {
2604 if (link->network->bond->state == NETDEV_STATE_READY &&
2605 link->network->bond->ifindex == link->master_ifindex)
2606 return link_joined(link);
2607
2608 log_struct(LOG_DEBUG,
2609 LOG_LINK_INTERFACE(link),
2610 LOG_NETDEV_INTERFACE(link->network->bond),
2611 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2612
2613 link->enslaving++;
2614
2615 r = netdev_join(link->network->bond, link, netdev_join_handler);
2616 if (r < 0) {
2617 log_struct_errno(LOG_WARNING, r,
2618 LOG_LINK_INTERFACE(link),
2619 LOG_NETDEV_INTERFACE(link->network->bond),
2620 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2621 link_enter_failed(link);
2622 return r;
2623 }
2624 }
2625
2626 if (link->network->bridge) {
2627 log_struct(LOG_DEBUG,
2628 LOG_LINK_INTERFACE(link),
2629 LOG_NETDEV_INTERFACE(link->network->bridge),
2630 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2631
2632 link->enslaving++;
2633
2634 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2635 if (r < 0) {
2636 log_struct_errno(LOG_WARNING, r,
2637 LOG_LINK_INTERFACE(link),
2638 LOG_NETDEV_INTERFACE(link->network->bridge),
2639 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2640 link_enter_failed(link);
2641 return r;
2642 }
2643 }
2644
2645 if (link->network->vrf) {
2646 log_struct(LOG_DEBUG,
2647 LOG_LINK_INTERFACE(link),
2648 LOG_NETDEV_INTERFACE(link->network->vrf),
2649 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2650
2651 link->enslaving++;
2652
2653 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2654 if (r < 0) {
2655 log_struct_errno(LOG_WARNING, r,
2656 LOG_LINK_INTERFACE(link),
2657 LOG_NETDEV_INTERFACE(link->network->vrf),
2658 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2659 link_enter_failed(link);
2660 return r;
2661 }
2662 }
2663
2664 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2665
2666 if (netdev->ifindex > 0) {
2667 link_joined(link);
2668 continue;
2669 }
2670
2671 log_struct(LOG_DEBUG,
2672 LOG_LINK_INTERFACE(link),
2673 LOG_NETDEV_INTERFACE(netdev),
2674 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2675
2676 link->enslaving++;
2677
2678 r = netdev_join(netdev, link, netdev_join_handler);
2679 if (r < 0) {
2680 log_struct_errno(LOG_WARNING, r,
2681 LOG_LINK_INTERFACE(link),
2682 LOG_NETDEV_INTERFACE(netdev),
2683 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2684 link_enter_failed(link);
2685 return r;
2686 }
2687 }
2688
2689 if (link->enslaving == 0)
2690 return link_joined(link);
2691
2692 return 0;
2693 }
2694
2695 static int link_set_ipv4_forward(Link *link) {
2696 int r;
2697
2698 if (!link_ipv4_forward_enabled(link))
2699 return 0;
2700
2701 /* We propagate the forwarding flag from one interface to the
2702 * global setting one way. This means: as long as at least one
2703 * interface was configured at any time that had IP forwarding
2704 * enabled the setting will stay on for good. We do this
2705 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2706 * somewhat in sync (see below). */
2707
2708 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2709 if (r < 0)
2710 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2711
2712 return 0;
2713 }
2714
2715 static int link_set_ipv6_forward(Link *link) {
2716 int r;
2717
2718 if (!link_ipv6_forward_enabled(link))
2719 return 0;
2720
2721 /* On Linux, the IPv6 stack does not know a per-interface
2722 * packet forwarding setting: either packet forwarding is on
2723 * for all, or off for all. We hence don't bother with a
2724 * per-interface setting, but simply propagate the interface
2725 * flag, if it is set, to the global flag, one-way. Note that
2726 * while IPv4 would allow a per-interface flag, we expose the
2727 * same behaviour there and also propagate the setting from
2728 * one to all, to keep things simple (see above). */
2729
2730 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2731 if (r < 0)
2732 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2733
2734 return 0;
2735 }
2736
2737 static int link_set_ipv6_privacy_extensions(Link *link) {
2738 IPv6PrivacyExtensions s;
2739 int r;
2740
2741 s = link_ipv6_privacy_extensions(link);
2742 if (s < 0)
2743 return 0;
2744
2745 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2746 if (r < 0)
2747 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2748
2749 return 0;
2750 }
2751
2752 static int link_set_ipv6_accept_ra(Link *link) {
2753 int r;
2754
2755 /* Make this a NOP if IPv6 is not available */
2756 if (!socket_ipv6_is_supported())
2757 return 0;
2758
2759 if (link->flags & IFF_LOOPBACK)
2760 return 0;
2761
2762 if (!link->network)
2763 return 0;
2764
2765 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2766 if (r < 0)
2767 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2768
2769 return 0;
2770 }
2771
2772 static int link_set_ipv6_dad_transmits(Link *link) {
2773 int r;
2774
2775 /* Make this a NOP if IPv6 is not available */
2776 if (!socket_ipv6_is_supported())
2777 return 0;
2778
2779 if (link->flags & IFF_LOOPBACK)
2780 return 0;
2781
2782 if (!link->network)
2783 return 0;
2784
2785 if (link->network->ipv6_dad_transmits < 0)
2786 return 0;
2787
2788 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2789 if (r < 0)
2790 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2791
2792 return 0;
2793 }
2794
2795 static int link_set_ipv6_hop_limit(Link *link) {
2796 int r;
2797
2798 /* Make this a NOP if IPv6 is not available */
2799 if (!socket_ipv6_is_supported())
2800 return 0;
2801
2802 if (link->flags & IFF_LOOPBACK)
2803 return 0;
2804
2805 if (!link->network)
2806 return 0;
2807
2808 if (link->network->ipv6_hop_limit < 0)
2809 return 0;
2810
2811 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2812 if (r < 0)
2813 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2814
2815 return 0;
2816 }
2817
2818 static int link_set_ipv6_mtu(Link *link) {
2819 int r;
2820
2821 /* Make this a NOP if IPv6 is not available */
2822 if (!socket_ipv6_is_supported())
2823 return 0;
2824
2825 if (link->flags & IFF_LOOPBACK)
2826 return 0;
2827
2828 if (link->network->ipv6_mtu == 0)
2829 return 0;
2830
2831 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2832 if (r < 0)
2833 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2834
2835 return 0;
2836 }
2837
2838 static bool link_is_static_address_configured(Link *link, Address *address) {
2839 Address *net_address;
2840
2841 assert(link);
2842 assert(address);
2843
2844 if (!link->network)
2845 return false;
2846
2847 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2848 if (address_equal(net_address, address))
2849 return true;
2850
2851 return false;
2852 }
2853
2854 static bool link_is_static_route_configured(Link *link, Route *route) {
2855 Route *net_route;
2856
2857 assert(link);
2858 assert(route);
2859
2860 if (!link->network)
2861 return false;
2862
2863 LIST_FOREACH(routes, net_route, link->network->static_routes)
2864 if (route_equal(net_route, route))
2865 return true;
2866
2867 return false;
2868 }
2869
2870 static int link_drop_foreign_config(Link *link) {
2871 Address *address;
2872 Route *route;
2873 Iterator i;
2874 int r;
2875
2876 SET_FOREACH(address, link->addresses_foreign, i) {
2877 /* we consider IPv6LL addresses to be managed by the kernel */
2878 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2879 continue;
2880
2881 if (link_is_static_address_configured(link, address)) {
2882 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2883 if (r < 0)
2884 return log_link_error_errno(link, r, "Failed to add address: %m");
2885 } else {
2886 r = address_remove(address, link, NULL);
2887 if (r < 0)
2888 return r;
2889 }
2890 }
2891
2892 SET_FOREACH(route, link->routes_foreign, i) {
2893 /* do not touch routes managed by the kernel */
2894 if (route->protocol == RTPROT_KERNEL)
2895 continue;
2896
2897 if (link_is_static_route_configured(link, route)) {
2898 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2899 if (r < 0)
2900 return r;
2901 } else {
2902 r = route_remove(route, link, NULL);
2903 if (r < 0)
2904 return r;
2905 }
2906 }
2907
2908 return 0;
2909 }
2910
2911 static int link_drop_config(Link *link) {
2912 Address *address, *pool_address;
2913 Route *route;
2914 Iterator i;
2915 int r;
2916
2917 SET_FOREACH(address, link->addresses, i) {
2918 /* we consider IPv6LL addresses to be managed by the kernel */
2919 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2920 continue;
2921
2922 r = address_remove(address, link, NULL);
2923 if (r < 0)
2924 return r;
2925
2926 /* If this address came from an address pool, clean up the pool */
2927 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2928 if (address_equal(address, pool_address)) {
2929 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2930 address_free(pool_address);
2931 break;
2932 }
2933 }
2934 }
2935
2936 SET_FOREACH(route, link->routes, i) {
2937 /* do not touch routes managed by the kernel */
2938 if (route->protocol == RTPROT_KERNEL)
2939 continue;
2940
2941 r = route_remove(route, link, NULL);
2942 if (r < 0)
2943 return r;
2944 }
2945
2946 ndisc_flush(link);
2947
2948 return 0;
2949 }
2950
2951 static int link_update_lldp(Link *link) {
2952 int r;
2953
2954 assert(link);
2955
2956 if (!link->lldp)
2957 return 0;
2958
2959 if (link->flags & IFF_UP) {
2960 r = sd_lldp_start(link->lldp);
2961 if (r > 0)
2962 log_link_debug(link, "Started LLDP.");
2963 } else {
2964 r = sd_lldp_stop(link->lldp);
2965 if (r > 0)
2966 log_link_debug(link, "Stopped LLDP.");
2967 }
2968
2969 return r;
2970 }
2971
2972 static int link_configure_can(Link *link) {
2973 int r;
2974
2975 if (streq_ptr(link->kind, "can")) {
2976 /* The CAN interface must be down to configure bitrate, etc... */
2977 if ((link->flags & IFF_UP)) {
2978 r = link_down(link);
2979 if (r < 0) {
2980 link_enter_failed(link);
2981 return r;
2982 }
2983
2984 return 0;
2985 }
2986
2987 return link_set_can(link);
2988 }
2989
2990 if (!(link->flags & IFF_UP)) {
2991 r = link_up_can(link);
2992 if (r < 0) {
2993 link_enter_failed(link);
2994 return r;
2995 }
2996 }
2997
2998 return 0;
2999 }
3000
3001 static int link_configure(Link *link) {
3002 int r;
3003
3004 assert(link);
3005 assert(link->network);
3006 assert(link->state == LINK_STATE_PENDING);
3007
3008 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
3009 return link_configure_can(link);
3010
3011 /* Drop foreign config, but ignore loopback or critical devices.
3012 * We do not want to remove loopback address or addresses used for root NFS. */
3013 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
3014 r = link_drop_foreign_config(link);
3015 if (r < 0)
3016 return r;
3017 }
3018
3019 r = link_set_proxy_arp(link);
3020 if (r < 0)
3021 return r;
3022
3023 r = ipv6_proxy_ndp_addresses_configure(link);
3024 if (r < 0)
3025 return r;
3026
3027 r = link_set_ipv4_forward(link);
3028 if (r < 0)
3029 return r;
3030
3031 r = link_set_ipv6_forward(link);
3032 if (r < 0)
3033 return r;
3034
3035 r = link_set_ipv6_privacy_extensions(link);
3036 if (r < 0)
3037 return r;
3038
3039 r = link_set_ipv6_accept_ra(link);
3040 if (r < 0)
3041 return r;
3042
3043 r = link_set_ipv6_dad_transmits(link);
3044 if (r < 0)
3045 return r;
3046
3047 r = link_set_ipv6_hop_limit(link);
3048 if (r < 0)
3049 return r;
3050
3051 r = link_set_flags(link);
3052 if (r < 0)
3053 return r;
3054
3055 r = link_set_ipv6_mtu(link);
3056 if (r < 0)
3057 return r;
3058
3059 if (link_ipv4ll_enabled(link)) {
3060 r = ipv4ll_configure(link);
3061 if (r < 0)
3062 return r;
3063 }
3064
3065 if (link_dhcp4_enabled(link)) {
3066 r = dhcp4_set_promote_secondaries(link);
3067 if (r < 0)
3068 return r;
3069
3070 r = dhcp4_configure(link);
3071 if (r < 0)
3072 return r;
3073 }
3074
3075 if (link_dhcp4_server_enabled(link)) {
3076 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
3077 if (r < 0)
3078 return r;
3079
3080 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
3081 if (r < 0)
3082 return r;
3083 }
3084
3085 if (link_dhcp6_enabled(link) ||
3086 link_ipv6_accept_ra_enabled(link)) {
3087 r = dhcp6_configure(link);
3088 if (r < 0)
3089 return r;
3090 }
3091
3092 if (link_ipv6_accept_ra_enabled(link)) {
3093 r = ndisc_configure(link);
3094 if (r < 0)
3095 return r;
3096 }
3097
3098 if (link_radv_enabled(link)) {
3099 r = radv_configure(link);
3100 if (r < 0)
3101 return r;
3102 }
3103
3104 if (link_lldp_rx_enabled(link)) {
3105 r = sd_lldp_new(&link->lldp);
3106 if (r < 0)
3107 return r;
3108
3109 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
3110 if (r < 0)
3111 return r;
3112
3113 r = sd_lldp_match_capabilities(link->lldp,
3114 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
3115 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
3116 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
3117 if (r < 0)
3118 return r;
3119
3120 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
3121 if (r < 0)
3122 return r;
3123
3124 r = sd_lldp_attach_event(link->lldp, NULL, 0);
3125 if (r < 0)
3126 return r;
3127
3128 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
3129 if (r < 0)
3130 return r;
3131
3132 r = link_update_lldp(link);
3133 if (r < 0)
3134 return r;
3135 }
3136
3137 r = link_set_mtu(link, link->network->mtu, link->network->mtu_is_set);
3138 if (r < 0)
3139 return r;
3140
3141 if (socket_ipv6_is_supported()) {
3142 r = link_configure_addrgen_mode(link);
3143 if (r < 0)
3144 return r;
3145 }
3146
3147 return link_configure_after_setting_mtu(link);
3148 }
3149
3150 static int link_configure_after_setting_mtu(Link *link) {
3151 int r;
3152
3153 assert(link);
3154 assert(link->network);
3155 assert(link->state == LINK_STATE_PENDING);
3156
3157 if (link->setting_mtu)
3158 return 0;
3159
3160 if (link_has_carrier(link) || link->network->configure_without_carrier) {
3161 r = link_acquire_conf(link);
3162 if (r < 0)
3163 return r;
3164 }
3165
3166 return link_enter_join_netdev(link);
3167 }
3168
3169 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3170 assert(duid);
3171
3172 if (duid->raw_data_len > 0)
3173 return 0;
3174
3175 if (duid->type != DUID_TYPE_UUID)
3176 return -EINVAL;
3177
3178 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3179 duid->raw_data_len = sizeof(sd_id128_t);
3180
3181 return 1;
3182 }
3183
3184 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3185 Manager *manager = userdata;
3186 const sd_bus_error *e;
3187 const void *a;
3188 size_t sz;
3189 DUID *duid;
3190 Link *link;
3191 int r;
3192
3193 assert(m);
3194 assert(manager);
3195
3196 e = sd_bus_message_get_error(m);
3197 if (e) {
3198 log_error_errno(sd_bus_error_get_errno(e),
3199 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3200 e->message);
3201 goto configure;
3202 }
3203
3204 r = sd_bus_message_read_array(m, 'y', &a, &sz);
3205 if (r < 0)
3206 goto configure;
3207
3208 if (sz != sizeof(sd_id128_t)) {
3209 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3210 goto configure;
3211 }
3212
3213 memcpy(&manager->product_uuid, a, sz);
3214 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3215 (void) duid_set_uuid(duid, manager->product_uuid);
3216
3217 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3218
3219 configure:
3220 while ((link = set_steal_first(manager->links_requesting_uuid))) {
3221 r = link_configure(link);
3222 if (r < 0)
3223 log_link_error_errno(link, r, "Failed to configure link: %m");
3224 }
3225
3226 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3227
3228 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3229 * even if the method fails. */
3230 manager->has_product_uuid = true;
3231
3232 return 1;
3233 }
3234
3235 static bool link_requires_uuid(Link *link) {
3236 const DUID *duid;
3237
3238 assert(link);
3239 assert(link->manager);
3240 assert(link->network);
3241
3242 duid = link_get_duid(link);
3243 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3244 return false;
3245
3246 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3247 return true;
3248
3249 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3250 return true;
3251
3252 return false;
3253 }
3254
3255 static int link_configure_duid(Link *link) {
3256 Manager *m;
3257 DUID *duid;
3258 int r;
3259
3260 assert(link);
3261 assert(link->manager);
3262 assert(link->network);
3263
3264 m = link->manager;
3265 duid = link_get_duid(link);
3266
3267 if (!link_requires_uuid(link))
3268 return 1;
3269
3270 if (m->has_product_uuid) {
3271 (void) duid_set_uuid(duid, m->product_uuid);
3272 return 1;
3273 }
3274
3275 if (!m->links_requesting_uuid) {
3276 r = manager_request_product_uuid(m, link);
3277 if (r < 0) {
3278 if (r == -ENOMEM)
3279 return r;
3280
3281 log_link_warning_errno(link, r,
3282 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3283 return 1;
3284 }
3285 } else {
3286 r = set_put(m->links_requesting_uuid, link);
3287 if (r < 0)
3288 return log_oom();
3289
3290 r = set_put(m->duids_requesting_uuid, duid);
3291 if (r < 0)
3292 return log_oom();
3293 }
3294
3295 return 0;
3296 }
3297
3298 static int link_initialized_and_synced(Link *link) {
3299 Network *network;
3300 int r;
3301
3302 assert(link);
3303 assert(link->ifname);
3304 assert(link->manager);
3305
3306 if (link->state != LINK_STATE_PENDING)
3307 return 1;
3308
3309 log_link_debug(link, "Link state is up-to-date");
3310
3311 r = link_new_bound_by_list(link);
3312 if (r < 0)
3313 return r;
3314
3315 r = link_handle_bound_by_list(link);
3316 if (r < 0)
3317 return r;
3318
3319 if (!link->network) {
3320 r = network_get(link->manager, link->sd_device, link->ifname,
3321 &link->mac, &network);
3322 if (r == -ENOENT) {
3323 link_enter_unmanaged(link);
3324 return 1;
3325 } else if (r == 0 && network->unmanaged) {
3326 link_enter_unmanaged(link);
3327 return 0;
3328 } else if (r < 0)
3329 return r;
3330
3331 if (link->flags & IFF_LOOPBACK) {
3332 if (network->link_local != ADDRESS_FAMILY_NO)
3333 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3334
3335 if (network->dhcp != ADDRESS_FAMILY_NO)
3336 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3337
3338 if (network->dhcp_server)
3339 log_link_debug(link, "Ignoring DHCP server for loopback link");
3340 }
3341
3342 r = network_apply(network, link);
3343 if (r < 0)
3344 return r;
3345 }
3346
3347 r = link_new_bound_to_list(link);
3348 if (r < 0)
3349 return r;
3350
3351 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3352 * link_configure() is called later asynchronously. */
3353 r = link_configure_duid(link);
3354 if (r <= 0)
3355 return r;
3356
3357 r = link_configure(link);
3358 if (r < 0)
3359 return r;
3360
3361 return 1;
3362 }
3363
3364 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3365 (void) link_initialized_and_synced(link);
3366 return 1;
3367 }
3368
3369 int link_initialized(Link *link, sd_device *device) {
3370 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3371 int r;
3372
3373 assert(link);
3374 assert(link->manager);
3375 assert(link->manager->rtnl);
3376 assert(device);
3377
3378 if (link->state != LINK_STATE_PENDING)
3379 return 0;
3380
3381 if (link->sd_device)
3382 return 0;
3383
3384 log_link_debug(link, "udev initialized link");
3385
3386 link->sd_device = sd_device_ref(device);
3387
3388 /* udev has initialized the link, but we don't know if we have yet
3389 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3390 * when it returns we know that the pending NEWLINKs have already been
3391 * processed and that we are up-to-date */
3392
3393 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3394 link->ifindex);
3395 if (r < 0)
3396 return r;
3397
3398 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3399 link_netlink_destroy_callback, link);
3400 if (r < 0)
3401 return r;
3402
3403 link_ref(link);
3404
3405 return 0;
3406 }
3407
3408 static int link_load(Link *link) {
3409 _cleanup_free_ char *network_file = NULL,
3410 *addresses = NULL,
3411 *routes = NULL,
3412 *dhcp4_address = NULL,
3413 *ipv4ll_address = NULL;
3414 union in_addr_union address;
3415 union in_addr_union route_dst;
3416 const char *p;
3417 int r;
3418
3419 assert(link);
3420
3421 r = parse_env_file(NULL, link->state_file,
3422 "NETWORK_FILE", &network_file,
3423 "ADDRESSES", &addresses,
3424 "ROUTES", &routes,
3425 "DHCP4_ADDRESS", &dhcp4_address,
3426 "IPV4LL_ADDRESS", &ipv4ll_address);
3427 if (r < 0 && r != -ENOENT)
3428 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3429
3430 if (network_file) {
3431 Network *network;
3432 char *suffix;
3433
3434 /* drop suffix */
3435 suffix = strrchr(network_file, '.');
3436 if (!suffix) {
3437 log_link_debug(link, "Failed to get network name from %s", network_file);
3438 goto network_file_fail;
3439 }
3440 *suffix = '\0';
3441
3442 r = network_get_by_name(link->manager, basename(network_file), &network);
3443 if (r < 0) {
3444 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3445 goto network_file_fail;
3446 }
3447
3448 r = network_apply(network, link);
3449 if (r < 0)
3450 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3451 }
3452
3453 network_file_fail:
3454
3455 if (addresses) {
3456 p = addresses;
3457
3458 for (;;) {
3459 _cleanup_free_ char *address_str = NULL;
3460 char *prefixlen_str;
3461 int family;
3462 unsigned char prefixlen;
3463
3464 r = extract_first_word(&p, &address_str, NULL, 0);
3465 if (r < 0) {
3466 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3467 continue;
3468 }
3469 if (r == 0)
3470 break;
3471
3472 prefixlen_str = strchr(address_str, '/');
3473 if (!prefixlen_str) {
3474 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3475 continue;
3476 }
3477
3478 *prefixlen_str++ = '\0';
3479
3480 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3481 if (r != 1) {
3482 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3483 continue;
3484 }
3485
3486 r = in_addr_from_string_auto(address_str, &family, &address);
3487 if (r < 0) {
3488 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3489 continue;
3490 }
3491
3492 r = address_add(link, family, &address, prefixlen, NULL);
3493 if (r < 0)
3494 return log_link_error_errno(link, r, "Failed to add address: %m");
3495 }
3496 }
3497
3498 if (routes) {
3499 p = routes;
3500
3501 for (;;) {
3502 Route *route;
3503 _cleanup_free_ char *route_str = NULL;
3504 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3505 usec_t lifetime;
3506 char *prefixlen_str;
3507 int family;
3508 unsigned char prefixlen, tos, table;
3509 uint32_t priority;
3510
3511 r = extract_first_word(&p, &route_str, NULL, 0);
3512 if (r < 0) {
3513 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3514 continue;
3515 }
3516 if (r == 0)
3517 break;
3518
3519 prefixlen_str = strchr(route_str, '/');
3520 if (!prefixlen_str) {
3521 log_link_debug(link, "Failed to parse route %s", route_str);
3522 continue;
3523 }
3524
3525 *prefixlen_str++ = '\0';
3526
3527 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3528 if (r != 5) {
3529 log_link_debug(link,
3530 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3531 prefixlen_str);
3532 continue;
3533 }
3534
3535 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3536 if (r < 0) {
3537 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3538 continue;
3539 }
3540
3541 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3542 if (r < 0)
3543 return log_link_error_errno(link, r, "Failed to add route: %m");
3544
3545 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3546 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3547 0, route_expire_handler, route);
3548 if (r < 0)
3549 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3550 }
3551
3552 route->lifetime = lifetime;
3553 sd_event_source_unref(route->expire);
3554 route->expire = TAKE_PTR(expire);
3555 }
3556 }
3557
3558 if (dhcp4_address) {
3559 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3560 if (r < 0) {
3561 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3562 goto dhcp4_address_fail;
3563 }
3564
3565 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3566 if (r < 0)
3567 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3568
3569 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3570 if (r < 0)
3571 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3572 }
3573
3574 dhcp4_address_fail:
3575
3576 if (ipv4ll_address) {
3577 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3578 if (r < 0) {
3579 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3580 goto ipv4ll_address_fail;
3581 }
3582
3583 r = sd_ipv4ll_new(&link->ipv4ll);
3584 if (r < 0)
3585 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3586
3587 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3588 if (r < 0)
3589 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3590 }
3591
3592 ipv4ll_address_fail:
3593
3594 return 0;
3595 }
3596
3597 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3598 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3599 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3600 Link *link;
3601 int r;
3602
3603 assert(m);
3604 assert(m->rtnl);
3605 assert(message);
3606 assert(ret);
3607
3608 r = link_new(m, message, ret);
3609 if (r < 0)
3610 return r;
3611
3612 link = *ret;
3613
3614 log_link_debug(link, "Link %d added", link->ifindex);
3615
3616 r = link_load(link);
3617 if (r < 0)
3618 return r;
3619
3620 if (detect_container() <= 0) {
3621 /* not in a container, udev will be around */
3622 sprintf(ifindex_str, "n%d", link->ifindex);
3623 r = sd_device_new_from_device_id(&device, ifindex_str);
3624 if (r < 0) {
3625 log_link_warning_errno(link, r, "Could not find device: %m");
3626 goto failed;
3627 }
3628
3629 r = sd_device_get_is_initialized(device);
3630 if (r < 0) {
3631 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3632 goto failed;
3633 }
3634 if (r == 0) {
3635 /* not yet ready */
3636 log_link_debug(link, "link pending udev initialization...");
3637 return 0;
3638 }
3639
3640 r = device_is_renaming(device);
3641 if (r < 0) {
3642 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3643 goto failed;
3644 }
3645 if (r > 0) {
3646 log_link_debug(link, "Interface is under renaming, pending initialization.");
3647 return 0;
3648 }
3649
3650 r = link_initialized(link, device);
3651 if (r < 0)
3652 goto failed;
3653 } else {
3654 r = link_initialized_and_synced(link);
3655 if (r < 0)
3656 goto failed;
3657 }
3658
3659 return 0;
3660 failed:
3661 link_enter_failed(link);
3662 return r;
3663 }
3664
3665 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3666 int r;
3667
3668 assert(link);
3669
3670 log_link_info(link, "Gained IPv6LL");
3671
3672 link->ipv6ll_address = *address;
3673 link_check_ready(link);
3674
3675 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3676 r = link_acquire_ipv6_conf(link);
3677 if (r < 0) {
3678 link_enter_failed(link);
3679 return r;
3680 }
3681 }
3682
3683 return 0;
3684 }
3685
3686 static int link_carrier_gained(Link *link) {
3687 int r;
3688
3689 assert(link);
3690
3691 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3692 r = link_acquire_conf(link);
3693 if (r < 0) {
3694 link_enter_failed(link);
3695 return r;
3696 }
3697
3698 r = link_request_set_addresses(link);
3699 if (r < 0)
3700 return r;
3701 }
3702
3703 r = link_handle_bound_by_list(link);
3704 if (r < 0)
3705 return r;
3706
3707 return 0;
3708 }
3709
3710 static int link_carrier_lost(Link *link) {
3711 int r;
3712
3713 assert(link);
3714
3715 if (link->network && link->network->ignore_carrier_loss)
3716 return 0;
3717
3718 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3719 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3720 * configuration and stop the clients as well. */
3721 if (link->setting_mtu)
3722 return 0;
3723
3724 r = link_stop_clients(link);
3725 if (r < 0) {
3726 link_enter_failed(link);
3727 return r;
3728 }
3729
3730 if (link_dhcp4_server_enabled(link))
3731 (void) sd_dhcp_server_stop(link->dhcp_server);
3732
3733 r = link_drop_config(link);
3734 if (r < 0)
3735 return r;
3736
3737 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3738 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3739 r = link_drop_foreign_config(link);
3740 if (r < 0)
3741 return r;
3742 }
3743
3744 r = link_handle_bound_by_list(link);
3745 if (r < 0)
3746 return r;
3747
3748 return 0;
3749 }
3750
3751 int link_carrier_reset(Link *link) {
3752 int r;
3753
3754 assert(link);
3755
3756 if (link_has_carrier(link)) {
3757 r = link_carrier_lost(link);
3758 if (r < 0)
3759 return r;
3760
3761 r = link_carrier_gained(link);
3762 if (r < 0)
3763 return r;
3764
3765 log_link_info(link, "Reset carrier");
3766 }
3767
3768 return 0;
3769 }
3770
3771 int link_update(Link *link, sd_netlink_message *m) {
3772 struct ether_addr mac;
3773 const char *ifname;
3774 uint32_t mtu;
3775 bool had_carrier, carrier_gained, carrier_lost;
3776 int r;
3777
3778 assert(link);
3779 assert(link->ifname);
3780 assert(m);
3781
3782 if (link->state == LINK_STATE_LINGER) {
3783 log_link_info(link, "Link readded");
3784 link_set_state(link, LINK_STATE_CONFIGURING);
3785
3786 r = link_new_carrier_maps(link);
3787 if (r < 0)
3788 return r;
3789 }
3790
3791 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3792 if (r >= 0 && !streq(ifname, link->ifname)) {
3793 Manager *manager = link->manager;
3794
3795 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3796
3797 link_drop(link);
3798 r = link_add(manager, m, &link);
3799 if (r < 0)
3800 return r;
3801 }
3802
3803 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3804 if (r >= 0 && mtu > 0) {
3805 link->mtu = mtu;
3806 if (link->original_mtu == 0) {
3807 link->original_mtu = mtu;
3808 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3809 }
3810
3811 if (link->dhcp_client) {
3812 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3813 link->mtu);
3814 if (r < 0)
3815 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3816 }
3817
3818 if (link->radv) {
3819 r = sd_radv_set_mtu(link->radv, link->mtu);
3820 if (r < 0)
3821 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3822 }
3823 }
3824
3825 /* The kernel may broadcast NEWLINK messages without the MAC address
3826 set, simply ignore them. */
3827 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3828 if (r >= 0) {
3829 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3830 ETH_ALEN)) {
3831
3832 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3833 ETH_ALEN);
3834
3835 log_link_debug(link, "MAC address: "
3836 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3837 mac.ether_addr_octet[0],
3838 mac.ether_addr_octet[1],
3839 mac.ether_addr_octet[2],
3840 mac.ether_addr_octet[3],
3841 mac.ether_addr_octet[4],
3842 mac.ether_addr_octet[5]);
3843
3844 if (link->ipv4ll) {
3845 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3846 if (r < 0)
3847 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3848 }
3849
3850 if (link->dhcp_client) {
3851 r = sd_dhcp_client_set_mac(link->dhcp_client,
3852 (const uint8_t *) &link->mac,
3853 sizeof (link->mac),
3854 ARPHRD_ETHER);
3855 if (r < 0)
3856 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3857
3858 r = dhcp4_set_client_identifier(link);
3859 if (r < 0)
3860 return r;
3861 }
3862
3863 if (link->dhcp6_client) {
3864 const DUID* duid = link_get_duid(link);
3865
3866 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3867 (const uint8_t *) &link->mac,
3868 sizeof (link->mac),
3869 ARPHRD_ETHER);
3870 if (r < 0)
3871 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3872
3873 if (link->network->iaid_set) {
3874 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3875 link->network->iaid);
3876 if (r < 0)
3877 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3878 }
3879
3880 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3881 duid->type,
3882 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3883 duid->raw_data_len);
3884 if (r < 0)
3885 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3886 }
3887
3888 if (link->radv) {
3889 r = sd_radv_set_mac(link->radv, &link->mac);
3890 if (r < 0)
3891 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3892 }
3893
3894 if (link->ndisc) {
3895 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3896 if (r < 0)
3897 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3898 }
3899 }
3900 }
3901
3902 had_carrier = link_has_carrier(link);
3903
3904 r = link_update_flags(link, m);
3905 if (r < 0)
3906 return r;
3907
3908 r = link_update_lldp(link);
3909 if (r < 0)
3910 return r;
3911
3912 carrier_gained = !had_carrier && link_has_carrier(link);
3913 carrier_lost = had_carrier && !link_has_carrier(link);
3914
3915 if (carrier_gained) {
3916 log_link_info(link, "Gained carrier");
3917
3918 r = link_carrier_gained(link);
3919 if (r < 0)
3920 return r;
3921 } else if (carrier_lost) {
3922 log_link_info(link, "Lost carrier");
3923
3924 r = link_carrier_lost(link);
3925 if (r < 0)
3926 return r;
3927 }
3928
3929 return 0;
3930 }
3931
3932 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3933 bool space = false;
3934 Iterator i;
3935 Link *link;
3936
3937 assert(f);
3938 assert(prefix);
3939
3940 if (hashmap_isempty(h))
3941 return;
3942
3943 fputs(prefix, f);
3944 HASHMAP_FOREACH(link, h, i) {
3945 if (space)
3946 fputc(' ', f);
3947
3948 fprintf(f, "%i", link->ifindex);
3949 space = true;
3950 }
3951
3952 fputc('\n', f);
3953 }
3954
3955 int link_save(Link *link) {
3956 _cleanup_free_ char *temp_path = NULL;
3957 _cleanup_fclose_ FILE *f = NULL;
3958 const char *admin_state, *oper_state;
3959 Address *a;
3960 Route *route;
3961 Iterator i;
3962 int r;
3963
3964 assert(link);
3965 assert(link->state_file);
3966 assert(link->lease_file);
3967 assert(link->manager);
3968
3969 if (link->state == LINK_STATE_LINGER) {
3970 unlink(link->state_file);
3971 return 0;
3972 }
3973
3974 link_lldp_save(link);
3975
3976 admin_state = link_state_to_string(link->state);
3977 assert(admin_state);
3978
3979 oper_state = link_operstate_to_string(link->operstate);
3980 assert(oper_state);
3981
3982 r = fopen_temporary(link->state_file, &f, &temp_path);
3983 if (r < 0)
3984 goto fail;
3985
3986 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
3987 (void) fchmod(fileno(f), 0644);
3988
3989 fprintf(f,
3990 "# This is private data. Do not parse.\n"
3991 "ADMIN_STATE=%s\n"
3992 "OPER_STATE=%s\n",
3993 admin_state, oper_state);
3994
3995 if (link->network) {
3996 bool space;
3997 sd_dhcp6_lease *dhcp6_lease = NULL;
3998 const char *dhcp_domainname = NULL;
3999 char **dhcp6_domains = NULL;
4000 char **dhcp_domains = NULL;
4001 unsigned j;
4002
4003 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4004 yes_no(link->network->required_for_online));
4005
4006 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
4007 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
4008
4009 if (link->dhcp6_client) {
4010 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
4011 if (r < 0 && r != -ENOMSG)
4012 log_link_debug(link, "No DHCPv6 lease");
4013 }
4014
4015 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4016
4017 fputs("DNS=", f);
4018 space = false;
4019
4020 for (j = 0; j < link->network->n_dns; j++) {
4021 _cleanup_free_ char *b = NULL;
4022
4023 r = in_addr_to_string(link->network->dns[j].family,
4024 &link->network->dns[j].address, &b);
4025 if (r < 0) {
4026 log_debug_errno(r, "Failed to format address, ignoring: %m");
4027 continue;
4028 }
4029
4030 if (space)
4031 fputc(' ', f);
4032 fputs(b, f);
4033 space = true;
4034 }
4035
4036 if (link->network->dhcp_use_dns &&
4037 link->dhcp_lease) {
4038 const struct in_addr *addresses;
4039
4040 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
4041 if (r > 0)
4042 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4043 space = true;
4044 }
4045
4046 if (link->network->dhcp_use_dns && dhcp6_lease) {
4047 struct in6_addr *in6_addrs;
4048
4049 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
4050 if (r > 0) {
4051 if (space)
4052 fputc(' ', f);
4053 serialize_in6_addrs(f, in6_addrs, r);
4054 space = true;
4055 }
4056 }
4057
4058 /* Make sure to flush out old entries before we use the NDISC data */
4059 ndisc_vacuum(link);
4060
4061 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4062 NDiscRDNSS *dd;
4063
4064 SET_FOREACH(dd, link->ndisc_rdnss, i) {
4065 if (space)
4066 fputc(' ', f);
4067
4068 serialize_in6_addrs(f, &dd->address, 1);
4069 space = true;
4070 }
4071 }
4072
4073 fputc('\n', f);
4074
4075 fputs("NTP=", f);
4076 space = false;
4077 fputstrv(f, link->network->ntp, NULL, &space);
4078
4079 if (link->network->dhcp_use_ntp &&
4080 link->dhcp_lease) {
4081 const struct in_addr *addresses;
4082
4083 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
4084 if (r > 0)
4085 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4086 space = true;
4087 }
4088
4089 if (link->network->dhcp_use_ntp && dhcp6_lease) {
4090 struct in6_addr *in6_addrs;
4091 char **hosts;
4092
4093 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
4094 &in6_addrs);
4095 if (r > 0) {
4096 if (space)
4097 fputc(' ', f);
4098 serialize_in6_addrs(f, in6_addrs, r);
4099 space = true;
4100 }
4101
4102 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
4103 if (r > 0)
4104 fputstrv(f, hosts, NULL, &space);
4105 }
4106
4107 fputc('\n', f);
4108
4109 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4110 if (link->dhcp_lease) {
4111 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4112 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4113 }
4114 if (dhcp6_lease)
4115 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4116 }
4117
4118 ordered_set_print(f, "DOMAINS=", link->network->search_domains);
4119
4120 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4121 NDiscDNSSL *dd;
4122
4123 if (dhcp_domainname)
4124 fputs_with_space(f, dhcp_domainname, NULL, &space);
4125 if (dhcp_domains)
4126 fputstrv(f, dhcp_domains, NULL, &space);
4127 if (dhcp6_domains)
4128 fputstrv(f, dhcp6_domains, NULL, &space);
4129
4130 SET_FOREACH(dd, link->ndisc_dnssl, i)
4131 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4132 }
4133
4134 fputc('\n', f);
4135
4136 ordered_set_print(f, "ROUTE_DOMAINS=", link->network->route_domains);
4137
4138 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4139 NDiscDNSSL *dd;
4140
4141 if (dhcp_domainname)
4142 fputs_with_space(f, dhcp_domainname, NULL, &space);
4143 if (dhcp_domains)
4144 fputstrv(f, dhcp_domains, NULL, &space);
4145 if (dhcp6_domains)
4146 fputstrv(f, dhcp6_domains, NULL, &space);
4147
4148 SET_FOREACH(dd, link->ndisc_dnssl, i)
4149 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4150 }
4151
4152 fputc('\n', f);
4153
4154 fprintf(f, "LLMNR=%s\n",
4155 resolve_support_to_string(link->network->llmnr));
4156 fprintf(f, "MDNS=%s\n",
4157 resolve_support_to_string(link->network->mdns));
4158 if (link->network->dns_default_route >= 0)
4159 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
4160
4161 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4162 fprintf(f, "DNS_OVER_TLS=%s\n",
4163 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
4164
4165 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
4166 fprintf(f, "DNSSEC=%s\n",
4167 dnssec_mode_to_string(link->network->dnssec_mode));
4168
4169 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
4170 const char *n;
4171
4172 fputs("DNSSEC_NTA=", f);
4173 space = false;
4174 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
4175 fputs_with_space(f, n, NULL, &space);
4176 fputc('\n', f);
4177 }
4178
4179 fputs("ADDRESSES=", f);
4180 space = false;
4181 SET_FOREACH(a, link->addresses, i) {
4182 _cleanup_free_ char *address_str = NULL;
4183
4184 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4185 if (r < 0)
4186 goto fail;
4187
4188 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4189 space = true;
4190 }
4191 fputc('\n', f);
4192
4193 fputs("ROUTES=", f);
4194 space = false;
4195 SET_FOREACH(route, link->routes, i) {
4196 _cleanup_free_ char *route_str = NULL;
4197
4198 r = in_addr_to_string(route->family, &route->dst, &route_str);
4199 if (r < 0)
4200 goto fail;
4201
4202 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4203 space ? " " : "", route_str,
4204 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4205 space = true;
4206 }
4207
4208 fputc('\n', f);
4209 }
4210
4211 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4212 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4213
4214 if (link->dhcp_lease) {
4215 struct in_addr address;
4216 const char *tz = NULL;
4217
4218 assert(link->network);
4219
4220 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
4221 if (r >= 0)
4222 fprintf(f, "TIMEZONE=%s\n", tz);
4223
4224 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
4225 if (r >= 0) {
4226 fputs("DHCP4_ADDRESS=", f);
4227 serialize_in_addrs(f, &address, 1, false, NULL);
4228 fputc('\n', f);
4229 }
4230
4231 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4232 if (r < 0)
4233 goto fail;
4234
4235 fprintf(f,
4236 "DHCP_LEASE=%s\n",
4237 link->lease_file);
4238 } else
4239 unlink(link->lease_file);
4240
4241 if (link->ipv4ll) {
4242 struct in_addr address;
4243
4244 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4245 if (r >= 0) {
4246 fputs("IPV4LL_ADDRESS=", f);
4247 serialize_in_addrs(f, &address, 1, false, NULL);
4248 fputc('\n', f);
4249 }
4250 }
4251
4252 r = fflush_and_check(f);
4253 if (r < 0)
4254 goto fail;
4255
4256 if (rename(temp_path, link->state_file) < 0) {
4257 r = -errno;
4258 goto fail;
4259 }
4260
4261 return 0;
4262
4263 fail:
4264 (void) unlink(link->state_file);
4265 if (temp_path)
4266 (void) unlink(temp_path);
4267
4268 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4269 }
4270
4271 /* The serialized state in /run is no longer up-to-date. */
4272 void link_dirty(Link *link) {
4273 int r;
4274
4275 assert(link);
4276
4277 /* mark manager dirty as link is dirty */
4278 manager_dirty(link->manager);
4279
4280 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
4281 if (r < 0)
4282 /* allocation errors are ignored */
4283 return;
4284
4285 r = set_put(link->manager->dirty_links, link);
4286 if (r <= 0)
4287 /* don't take another ref if the link was already dirty */
4288 return;
4289
4290 link_ref(link);
4291 }
4292
4293 /* The serialized state in /run is up-to-date */
4294 void link_clean(Link *link) {
4295 assert(link);
4296 assert(link->manager);
4297
4298 link_unref(set_remove(link->manager->dirty_links, link));
4299 }
4300
4301 static const char* const link_state_table[_LINK_STATE_MAX] = {
4302 [LINK_STATE_PENDING] = "pending",
4303 [LINK_STATE_CONFIGURING] = "configuring",
4304 [LINK_STATE_CONFIGURED] = "configured",
4305 [LINK_STATE_UNMANAGED] = "unmanaged",
4306 [LINK_STATE_FAILED] = "failed",
4307 [LINK_STATE_LINGER] = "linger",
4308 };
4309
4310 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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