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networkd: Add bridge port capabilities
[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_flood >= 0) {
1599 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_FLOOD, link->network->multicast_flood);
1600 if (r < 0)
1601 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_FLOOD attribute: %m");
1602 }
1603
1604 if (link->network->multicast_to_unicast >= 0) {
1605 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_TO_UCAST, link->network->multicast_to_unicast);
1606 if (r < 0)
1607 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_TO_UCAST attribute: %m");
1608 }
1609
1610 if (link->network->neighbor_suppression >= 0) {
1611 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_NEIGH_SUPPRESS, link->network->neighbor_suppression);
1612 if (r < 0)
1613 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_NEIGH_SUPPRESS attribute: %m");
1614 }
1615
1616 if (link->network->learning >= 0) {
1617 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_LEARNING, link->network->learning);
1618 if (r < 0)
1619 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_LEARNING attribute: %m");
1620 }
1621
1622 if (link->network->cost != 0) {
1623 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1624 if (r < 0)
1625 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1626 }
1627
1628 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1629 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1630 if (r < 0)
1631 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1632 }
1633
1634 r = sd_netlink_message_close_container(req);
1635 if (r < 0)
1636 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1637
1638 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_handler,
1639 link_netlink_destroy_callback, link);
1640 if (r < 0)
1641 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1642
1643 link_ref(link);
1644
1645 return r;
1646 }
1647
1648 static int link_set_bond_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1649 int r;
1650
1651 assert(m);
1652 assert(link);
1653 assert(link->ifname);
1654
1655 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1656 return 1;
1657
1658 r = sd_netlink_message_get_errno(m);
1659 if (r < 0) {
1660 log_link_warning_errno(link, r, "Could not set bonding interface: %m");
1661 return 1;
1662 }
1663
1664 return 1;
1665 }
1666
1667 static int link_set_bond(Link *link) {
1668 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1669 int r;
1670
1671 assert(link);
1672 assert(link->network);
1673
1674 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1675 if (r < 0)
1676 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1677
1678 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1679 if (r < 0)
1680 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1681
1682 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1683 if (r < 0)
1684 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1685
1686 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1687 if (r < 0)
1688 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1689
1690 if (link->network->active_slave) {
1691 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1692 if (r < 0)
1693 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1694 }
1695
1696 if (link->network->primary_slave) {
1697 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1698 if (r < 0)
1699 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1700 }
1701
1702 r = sd_netlink_message_close_container(req);
1703 if (r < 0)
1704 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1705
1706 r = sd_netlink_message_close_container(req);
1707 if (r < 0)
1708 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1709
1710 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_bond_handler,
1711 link_netlink_destroy_callback, link);
1712 if (r < 0)
1713 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1714
1715 link_ref(link);
1716
1717 return r;
1718 }
1719
1720 static int link_append_to_master(Link *link, NetDev *netdev) {
1721 Link *master;
1722 int r;
1723
1724 assert(link);
1725 assert(netdev);
1726
1727 r = link_get(link->manager, netdev->ifindex, &master);
1728 if (r < 0)
1729 return r;
1730
1731 r = hashmap_ensure_allocated(&master->slaves, NULL);
1732 if (r < 0)
1733 return r;
1734
1735 r = hashmap_put(master->slaves, INT_TO_PTR(link->ifindex), link);
1736 if (r < 0)
1737 return r;
1738
1739 return 0;
1740 }
1741
1742 static int link_lldp_save(Link *link) {
1743 _cleanup_free_ char *temp_path = NULL;
1744 _cleanup_fclose_ FILE *f = NULL;
1745 sd_lldp_neighbor **l = NULL;
1746 int n = 0, r, i;
1747
1748 assert(link);
1749 assert(link->lldp_file);
1750
1751 if (!link->lldp) {
1752 (void) unlink(link->lldp_file);
1753 return 0;
1754 }
1755
1756 r = sd_lldp_get_neighbors(link->lldp, &l);
1757 if (r < 0)
1758 goto finish;
1759 if (r == 0) {
1760 (void) unlink(link->lldp_file);
1761 goto finish;
1762 }
1763
1764 n = r;
1765
1766 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1767 if (r < 0)
1768 goto finish;
1769
1770 fchmod(fileno(f), 0644);
1771
1772 for (i = 0; i < n; i++) {
1773 const void *p;
1774 le64_t u;
1775 size_t sz;
1776
1777 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1778 if (r < 0)
1779 goto finish;
1780
1781 u = htole64(sz);
1782 (void) fwrite(&u, 1, sizeof(u), f);
1783 (void) fwrite(p, 1, sz, f);
1784 }
1785
1786 r = fflush_and_check(f);
1787 if (r < 0)
1788 goto finish;
1789
1790 if (rename(temp_path, link->lldp_file) < 0) {
1791 r = -errno;
1792 goto finish;
1793 }
1794
1795 finish:
1796 if (r < 0) {
1797 (void) unlink(link->lldp_file);
1798 if (temp_path)
1799 (void) unlink(temp_path);
1800
1801 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1802 }
1803
1804 if (l) {
1805 for (i = 0; i < n; i++)
1806 sd_lldp_neighbor_unref(l[i]);
1807 free(l);
1808 }
1809
1810 return r;
1811 }
1812
1813 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1814 Link *link = userdata;
1815 int r;
1816
1817 assert(link);
1818
1819 (void) link_lldp_save(link);
1820
1821 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1822 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1823
1824 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1825
1826 r = link_lldp_emit_start(link);
1827 if (r < 0)
1828 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1829 }
1830 }
1831
1832 static int link_acquire_ipv6_conf(Link *link) {
1833 int r;
1834
1835 assert(link);
1836
1837 if (link_ipv6_accept_ra_enabled(link)) {
1838 assert(link->ndisc);
1839
1840 log_link_debug(link, "Discovering IPv6 routers");
1841
1842 r = sd_ndisc_start(link->ndisc);
1843 if (r < 0 && r != -EBUSY)
1844 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1845 }
1846
1847 if (link_radv_enabled(link)) {
1848 assert(link->radv);
1849 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1850
1851 log_link_debug(link, "Starting IPv6 Router Advertisements");
1852
1853 r = sd_radv_start(link->radv);
1854 if (r < 0 && r != -EBUSY)
1855 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1856 }
1857
1858 (void) dhcp6_request_prefix_delegation(link);
1859
1860 return 0;
1861 }
1862
1863 static int link_acquire_ipv4_conf(Link *link) {
1864 int r;
1865
1866 assert(link);
1867 assert(link->network);
1868 assert(link->manager);
1869 assert(link->manager->event);
1870
1871 if (link_ipv4ll_enabled(link)) {
1872 assert(link->ipv4ll);
1873
1874 log_link_debug(link, "Acquiring IPv4 link-local address");
1875
1876 r = sd_ipv4ll_start(link->ipv4ll);
1877 if (r < 0)
1878 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1879 }
1880
1881 if (link_dhcp4_enabled(link)) {
1882 assert(link->dhcp_client);
1883
1884 log_link_debug(link, "Acquiring DHCPv4 lease");
1885
1886 r = sd_dhcp_client_start(link->dhcp_client);
1887 if (r < 0)
1888 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1889 }
1890
1891 return 0;
1892 }
1893
1894 static int link_acquire_conf(Link *link) {
1895 int r;
1896
1897 assert(link);
1898
1899 r = link_acquire_ipv4_conf(link);
1900 if (r < 0)
1901 return r;
1902
1903 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1904 r = link_acquire_ipv6_conf(link);
1905 if (r < 0)
1906 return r;
1907 }
1908
1909 if (link_lldp_emit_enabled(link)) {
1910 r = link_lldp_emit_start(link);
1911 if (r < 0)
1912 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1913 }
1914
1915 return 0;
1916 }
1917
1918 bool link_has_carrier(Link *link) {
1919 /* see Documentation/networking/operstates.txt in the kernel sources */
1920
1921 if (link->kernel_operstate == IF_OPER_UP)
1922 return true;
1923
1924 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1925 /* operstate may not be implemented, so fall back to flags */
1926 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1927 return true;
1928
1929 return false;
1930 }
1931
1932 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1933 int r;
1934
1935 assert(link);
1936
1937 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1938 return 1;
1939
1940 r = sd_netlink_message_get_errno(m);
1941 if (r < 0)
1942 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1943
1944 return 1;
1945 }
1946
1947 static int link_configure_addrgen_mode(Link *link) {
1948 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1949 uint8_t ipv6ll_mode;
1950 int r;
1951
1952 assert(link);
1953 assert(link->network);
1954 assert(link->manager);
1955 assert(link->manager->rtnl);
1956
1957 log_link_debug(link, "Setting address genmode for link");
1958
1959 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1960 if (r < 0)
1961 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1962
1963 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1964 if (r < 0)
1965 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1966
1967 r = sd_netlink_message_open_container(req, AF_INET6);
1968 if (r < 0)
1969 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1970
1971 if (!link_ipv6ll_enabled(link))
1972 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1973 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1974 /* The file may not exist. And event if it exists, when stable_secret is unset,
1975 * reading the file fails with EIO. */
1976 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1977 else
1978 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1979
1980 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1981 if (r < 0)
1982 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1983
1984 r = sd_netlink_message_close_container(req);
1985 if (r < 0)
1986 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1987
1988 r = sd_netlink_message_close_container(req);
1989 if (r < 0)
1990 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1991
1992 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1993 link_netlink_destroy_callback, link);
1994 if (r < 0)
1995 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1996
1997 link_ref(link);
1998
1999 return 0;
2000 }
2001
2002 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2003 int r;
2004
2005 assert(link);
2006
2007 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2008 return 1;
2009
2010 r = sd_netlink_message_get_errno(m);
2011 if (r < 0)
2012 /* we warn but don't fail the link, as it may be brought up later */
2013 log_link_warning_errno(link, r, "Could not bring up interface: %m");
2014
2015 return 1;
2016 }
2017
2018 static int link_up(Link *link) {
2019 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2020 int r;
2021
2022 assert(link);
2023 assert(link->network);
2024 assert(link->manager);
2025 assert(link->manager->rtnl);
2026
2027 log_link_debug(link, "Bringing link up");
2028
2029 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2030 if (r < 0)
2031 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2032
2033 /* set it free if not enslaved with networkd */
2034 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
2035 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
2036 if (r < 0)
2037 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
2038 }
2039
2040 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
2041 if (r < 0)
2042 return log_link_error_errno(link, r, "Could not set link flags: %m");
2043
2044 if (link->network->mac) {
2045 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
2046 if (r < 0)
2047 return log_link_error_errno(link, r, "Could not set MAC address: %m");
2048 }
2049
2050 if (link_ipv6_enabled(link)) {
2051 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
2052 if (r < 0)
2053 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
2054
2055 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
2056 r = sd_netlink_message_open_container(req, AF_INET6);
2057 if (r < 0)
2058 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
2059
2060 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
2061 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
2062 if (r < 0)
2063 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
2064 }
2065
2066 r = sd_netlink_message_close_container(req);
2067 if (r < 0)
2068 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
2069
2070 r = sd_netlink_message_close_container(req);
2071 if (r < 0)
2072 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
2073 }
2074
2075 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2076 link_netlink_destroy_callback, link);
2077 if (r < 0)
2078 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2079
2080 link_ref(link);
2081
2082 return 0;
2083 }
2084
2085 static int link_up_can(Link *link) {
2086 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2087 int r;
2088
2089 assert(link);
2090
2091 log_link_debug(link, "Bringing CAN link up");
2092
2093 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2094 if (r < 0)
2095 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2096
2097 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
2098 if (r < 0)
2099 return log_link_error_errno(link, r, "Could not set link flags: %m");
2100
2101 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
2102 link_netlink_destroy_callback, link);
2103 if (r < 0)
2104 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2105
2106 link_ref(link);
2107
2108 return 0;
2109 }
2110
2111 static int link_set_can(Link *link) {
2112 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
2113 int r;
2114
2115 assert(link);
2116 assert(link->network);
2117 assert(link->manager);
2118 assert(link->manager->rtnl);
2119
2120 log_link_debug(link, "link_set_can");
2121
2122 r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
2123 if (r < 0)
2124 return log_link_error_errno(link, r, "Failed to allocate netlink message: %m");
2125
2126 r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
2127 if (r < 0)
2128 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
2129
2130 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
2131 if (r < 0)
2132 return log_link_error_errno(link, r, "Failed to open netlink container: %m");
2133
2134 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
2135 if (r < 0)
2136 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
2137
2138 if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) {
2139 struct can_bittiming bt = {
2140 .bitrate = link->network->can_bitrate,
2141 .sample_point = link->network->can_sample_point,
2142 };
2143
2144 if (link->network->can_bitrate > UINT32_MAX) {
2145 log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate);
2146 return -ERANGE;
2147 }
2148
2149 log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate);
2150 if (link->network->can_sample_point > 0)
2151 log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
2152 else
2153 log_link_debug(link, "Using default sample point");
2154
2155 r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
2156 if (r < 0)
2157 return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
2158 }
2159
2160 if (link->network->can_restart_us > 0) {
2161 char time_string[FORMAT_TIMESPAN_MAX];
2162 uint64_t restart_ms;
2163
2164 if (link->network->can_restart_us == USEC_INFINITY)
2165 restart_ms = 0;
2166 else
2167 restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC);
2168
2169 format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC);
2170
2171 if (restart_ms > UINT32_MAX) {
2172 log_link_error(link, "restart timeout (%s) too big.", time_string);
2173 return -ERANGE;
2174 }
2175
2176 log_link_debug(link, "Setting restart = %s", time_string);
2177
2178 r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
2179 if (r < 0)
2180 return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
2181 }
2182
2183 if (link->network->can_triple_sampling >= 0) {
2184 struct can_ctrlmode cm = {
2185 .mask = CAN_CTRLMODE_3_SAMPLES,
2186 .flags = link->network->can_triple_sampling ? CAN_CTRLMODE_3_SAMPLES : 0,
2187 };
2188
2189 log_link_debug(link, "%sabling triple-sampling", link->network->can_triple_sampling ? "En" : "Dis");
2190
2191 r = sd_netlink_message_append_data(m, IFLA_CAN_CTRLMODE, &cm, sizeof(cm));
2192 if (r < 0)
2193 return log_link_error_errno(link, r, "Could not append IFLA_CAN_CTRLMODE attribute: %m");
2194 }
2195
2196 r = sd_netlink_message_close_container(m);
2197 if (r < 0)
2198 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2199
2200 r = sd_netlink_message_close_container(m);
2201 if (r < 0)
2202 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
2203
2204 r = netlink_call_async(link->manager->rtnl, NULL, m, link_set_handler,
2205 link_netlink_destroy_callback, link);
2206 if (r < 0)
2207 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2208
2209 link_ref(link);
2210
2211 if (!(link->flags & IFF_UP)) {
2212 r = link_up_can(link);
2213 if (r < 0) {
2214 link_enter_failed(link);
2215 return r;
2216 }
2217 }
2218
2219 log_link_debug(link, "link_set_can done");
2220
2221 return r;
2222 }
2223
2224 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2225 int r;
2226
2227 assert(link);
2228
2229 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2230 return 1;
2231
2232 r = sd_netlink_message_get_errno(m);
2233 if (r < 0)
2234 log_link_warning_errno(link, r, "Could not bring down interface: %m");
2235
2236 if (streq_ptr(link->kind, "can"))
2237 link_set_can(link);
2238
2239 return 1;
2240 }
2241
2242 int link_down(Link *link) {
2243 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2244 int r;
2245
2246 assert(link);
2247 assert(link->manager);
2248 assert(link->manager->rtnl);
2249
2250 log_link_debug(link, "Bringing link down");
2251
2252 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
2253 RTM_SETLINK, link->ifindex);
2254 if (r < 0)
2255 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2256
2257 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
2258 if (r < 0)
2259 return log_link_error_errno(link, r, "Could not set link flags: %m");
2260
2261 r = netlink_call_async(link->manager->rtnl, NULL, req, link_down_handler,
2262 link_netlink_destroy_callback, link);
2263 if (r < 0)
2264 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2265
2266 link_ref(link);
2267
2268 return 0;
2269 }
2270
2271 static int link_handle_bound_to_list(Link *link) {
2272 Link *l;
2273 Iterator i;
2274 int r;
2275 bool required_up = false;
2276 bool link_is_up = false;
2277
2278 assert(link);
2279
2280 if (hashmap_isempty(link->bound_to_links))
2281 return 0;
2282
2283 if (link->flags & IFF_UP)
2284 link_is_up = true;
2285
2286 HASHMAP_FOREACH (l, link->bound_to_links, i)
2287 if (link_has_carrier(l)) {
2288 required_up = true;
2289 break;
2290 }
2291
2292 if (!required_up && link_is_up) {
2293 r = link_down(link);
2294 if (r < 0)
2295 return r;
2296 } else if (required_up && !link_is_up) {
2297 r = link_up(link);
2298 if (r < 0)
2299 return r;
2300 }
2301
2302 return 0;
2303 }
2304
2305 static int link_handle_bound_by_list(Link *link) {
2306 Iterator i;
2307 Link *l;
2308 int r;
2309
2310 assert(link);
2311
2312 if (hashmap_isempty(link->bound_by_links))
2313 return 0;
2314
2315 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2316 r = link_handle_bound_to_list(l);
2317 if (r < 0)
2318 return r;
2319 }
2320
2321 return 0;
2322 }
2323
2324 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2325 int r;
2326
2327 assert(link);
2328 assert(carrier);
2329
2330 if (link == carrier)
2331 return 0;
2332
2333 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2334 return 0;
2335
2336 r = hashmap_ensure_allocated(h, NULL);
2337 if (r < 0)
2338 return r;
2339
2340 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2341 if (r < 0)
2342 return r;
2343
2344 return 0;
2345 }
2346
2347 static int link_new_bound_by_list(Link *link) {
2348 Manager *m;
2349 Link *carrier;
2350 Iterator i;
2351 int r;
2352 bool list_updated = false;
2353
2354 assert(link);
2355 assert(link->manager);
2356
2357 m = link->manager;
2358
2359 HASHMAP_FOREACH(carrier, m->links, i) {
2360 if (!carrier->network)
2361 continue;
2362
2363 if (strv_isempty(carrier->network->bind_carrier))
2364 continue;
2365
2366 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2367 r = link_put_carrier(link, carrier, &link->bound_by_links);
2368 if (r < 0)
2369 return r;
2370
2371 list_updated = true;
2372 }
2373 }
2374
2375 if (list_updated)
2376 link_dirty(link);
2377
2378 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2379 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2380 if (r < 0)
2381 return r;
2382
2383 link_dirty(carrier);
2384 }
2385
2386 return 0;
2387 }
2388
2389 static int link_new_bound_to_list(Link *link) {
2390 Manager *m;
2391 Link *carrier;
2392 Iterator i;
2393 int r;
2394 bool list_updated = false;
2395
2396 assert(link);
2397 assert(link->manager);
2398
2399 if (!link->network)
2400 return 0;
2401
2402 if (strv_isempty(link->network->bind_carrier))
2403 return 0;
2404
2405 m = link->manager;
2406
2407 HASHMAP_FOREACH (carrier, m->links, i) {
2408 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2409 r = link_put_carrier(link, carrier, &link->bound_to_links);
2410 if (r < 0)
2411 return r;
2412
2413 list_updated = true;
2414 }
2415 }
2416
2417 if (list_updated)
2418 link_dirty(link);
2419
2420 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2421 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2422 if (r < 0)
2423 return r;
2424
2425 link_dirty(carrier);
2426 }
2427
2428 return 0;
2429 }
2430
2431 static int link_new_carrier_maps(Link *link) {
2432 int r;
2433
2434 r = link_new_bound_by_list(link);
2435 if (r < 0)
2436 return r;
2437
2438 r = link_handle_bound_by_list(link);
2439 if (r < 0)
2440 return r;
2441
2442 r = link_new_bound_to_list(link);
2443 if (r < 0)
2444 return r;
2445
2446 r = link_handle_bound_to_list(link);
2447 if (r < 0)
2448 return r;
2449
2450 return 0;
2451 }
2452
2453 static void link_free_bound_to_list(Link *link) {
2454 Link *bound_to;
2455 Iterator i;
2456
2457 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2458 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2459
2460 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2461 link_dirty(bound_to);
2462 }
2463
2464 return;
2465 }
2466
2467 static void link_free_bound_by_list(Link *link) {
2468 Link *bound_by;
2469 Iterator i;
2470
2471 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2472 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2473
2474 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2475 link_dirty(bound_by);
2476 link_handle_bound_to_list(bound_by);
2477 }
2478 }
2479
2480 return;
2481 }
2482
2483 static void link_free_carrier_maps(Link *link) {
2484 bool list_updated = false;
2485
2486 assert(link);
2487
2488 if (!hashmap_isempty(link->bound_to_links)) {
2489 link_free_bound_to_list(link);
2490 list_updated = true;
2491 }
2492
2493 if (!hashmap_isempty(link->bound_by_links)) {
2494 link_free_bound_by_list(link);
2495 list_updated = true;
2496 }
2497
2498 if (list_updated)
2499 link_dirty(link);
2500
2501 return;
2502 }
2503
2504 void link_drop(Link *link) {
2505 if (!link || link->state == LINK_STATE_LINGER)
2506 return;
2507
2508 link_set_state(link, LINK_STATE_LINGER);
2509
2510 link_free_carrier_maps(link);
2511
2512 log_link_debug(link, "Link removed");
2513
2514 (void) unlink(link->state_file);
2515
2516 link_detach_from_manager(link);
2517
2518 link_unref(link);
2519
2520 return;
2521 }
2522
2523 static int link_joined(Link *link) {
2524 int r;
2525
2526 assert(link);
2527 assert(link->network);
2528
2529 if (!hashmap_isempty(link->bound_to_links)) {
2530 r = link_handle_bound_to_list(link);
2531 if (r < 0)
2532 return r;
2533 } else if (!(link->flags & IFF_UP)) {
2534 r = link_up(link);
2535 if (r < 0) {
2536 link_enter_failed(link);
2537 return r;
2538 }
2539 }
2540
2541 if (link->network->bridge) {
2542 r = link_set_bridge(link);
2543 if (r < 0)
2544 log_link_error_errno(link, r, "Could not set bridge message: %m");
2545
2546 r = link_append_to_master(link, link->network->bridge);
2547 if (r < 0)
2548 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2549 }
2550
2551 if (link->network->bond) {
2552 r = link_set_bond(link);
2553 if (r < 0)
2554 log_link_error_errno(link, r, "Could not set bond message: %m");
2555
2556 r = link_append_to_master(link, link->network->bond);
2557 if (r < 0)
2558 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2559 }
2560
2561 if (link->network->use_br_vlan &&
2562 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2563 r = link_set_bridge_vlan(link);
2564 if (r < 0)
2565 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2566 }
2567
2568 /* Skip setting up addresses until it gets carrier,
2569 or it would try to set addresses twice,
2570 which is bad for non-idempotent steps. */
2571 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2572 return 0;
2573
2574 return link_request_set_addresses(link);
2575 }
2576
2577 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2578 int r;
2579
2580 assert(link);
2581 assert(link->network);
2582 assert(link->enslaving > 0);
2583 assert(!link->enslaved_raw);
2584
2585 link->enslaving--;
2586
2587 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2588 return 1;
2589
2590 r = sd_netlink_message_get_errno(m);
2591 if (r < 0 && r != -EEXIST) {
2592 log_link_error_errno(link, r, "Could not join netdev: %m");
2593 link_enter_failed(link);
2594 return 1;
2595 } else
2596 log_link_debug(link, "Joined netdev");
2597
2598 if (link->enslaving == 0) {
2599 link->enslaved_raw = true;
2600 link_joined(link);
2601 }
2602
2603 return 1;
2604 }
2605
2606 static int link_enter_join_netdev(Link *link) {
2607 NetDev *netdev;
2608 Iterator i;
2609 int r;
2610
2611 assert(link);
2612 assert(link->network);
2613 assert(link->state == LINK_STATE_PENDING);
2614
2615 link_set_state(link, LINK_STATE_CONFIGURING);
2616
2617 link_dirty(link);
2618 link->enslaving = 0;
2619 link->enslaved_raw = false;
2620
2621 if (link->network->bond) {
2622 if (link->network->bond->state == NETDEV_STATE_READY &&
2623 link->network->bond->ifindex == link->master_ifindex)
2624 return link_joined(link);
2625
2626 log_struct(LOG_DEBUG,
2627 LOG_LINK_INTERFACE(link),
2628 LOG_NETDEV_INTERFACE(link->network->bond),
2629 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2630
2631 link->enslaving++;
2632
2633 r = netdev_join(link->network->bond, link, netdev_join_handler);
2634 if (r < 0) {
2635 log_struct_errno(LOG_WARNING, r,
2636 LOG_LINK_INTERFACE(link),
2637 LOG_NETDEV_INTERFACE(link->network->bond),
2638 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2639 link_enter_failed(link);
2640 return r;
2641 }
2642 }
2643
2644 if (link->network->bridge) {
2645 log_struct(LOG_DEBUG,
2646 LOG_LINK_INTERFACE(link),
2647 LOG_NETDEV_INTERFACE(link->network->bridge),
2648 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2649
2650 link->enslaving++;
2651
2652 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2653 if (r < 0) {
2654 log_struct_errno(LOG_WARNING, r,
2655 LOG_LINK_INTERFACE(link),
2656 LOG_NETDEV_INTERFACE(link->network->bridge),
2657 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2658 link_enter_failed(link);
2659 return r;
2660 }
2661 }
2662
2663 if (link->network->vrf) {
2664 log_struct(LOG_DEBUG,
2665 LOG_LINK_INTERFACE(link),
2666 LOG_NETDEV_INTERFACE(link->network->vrf),
2667 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2668
2669 link->enslaving++;
2670
2671 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2672 if (r < 0) {
2673 log_struct_errno(LOG_WARNING, r,
2674 LOG_LINK_INTERFACE(link),
2675 LOG_NETDEV_INTERFACE(link->network->vrf),
2676 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2677 link_enter_failed(link);
2678 return r;
2679 }
2680 }
2681
2682 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2683
2684 if (netdev->ifindex > 0) {
2685 link_joined(link);
2686 continue;
2687 }
2688
2689 log_struct(LOG_DEBUG,
2690 LOG_LINK_INTERFACE(link),
2691 LOG_NETDEV_INTERFACE(netdev),
2692 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2693
2694 link->enslaving++;
2695
2696 r = netdev_join(netdev, link, netdev_join_handler);
2697 if (r < 0) {
2698 log_struct_errno(LOG_WARNING, r,
2699 LOG_LINK_INTERFACE(link),
2700 LOG_NETDEV_INTERFACE(netdev),
2701 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2702 link_enter_failed(link);
2703 return r;
2704 }
2705 }
2706
2707 if (link->enslaving == 0)
2708 return link_joined(link);
2709
2710 return 0;
2711 }
2712
2713 static int link_set_ipv4_forward(Link *link) {
2714 int r;
2715
2716 if (!link_ipv4_forward_enabled(link))
2717 return 0;
2718
2719 /* We propagate the forwarding flag from one interface to the
2720 * global setting one way. This means: as long as at least one
2721 * interface was configured at any time that had IP forwarding
2722 * enabled the setting will stay on for good. We do this
2723 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2724 * somewhat in sync (see below). */
2725
2726 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2727 if (r < 0)
2728 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2729
2730 return 0;
2731 }
2732
2733 static int link_set_ipv6_forward(Link *link) {
2734 int r;
2735
2736 if (!link_ipv6_forward_enabled(link))
2737 return 0;
2738
2739 /* On Linux, the IPv6 stack does not know a per-interface
2740 * packet forwarding setting: either packet forwarding is on
2741 * for all, or off for all. We hence don't bother with a
2742 * per-interface setting, but simply propagate the interface
2743 * flag, if it is set, to the global flag, one-way. Note that
2744 * while IPv4 would allow a per-interface flag, we expose the
2745 * same behaviour there and also propagate the setting from
2746 * one to all, to keep things simple (see above). */
2747
2748 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2749 if (r < 0)
2750 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2751
2752 return 0;
2753 }
2754
2755 static int link_set_ipv6_privacy_extensions(Link *link) {
2756 IPv6PrivacyExtensions s;
2757 int r;
2758
2759 s = link_ipv6_privacy_extensions(link);
2760 if (s < 0)
2761 return 0;
2762
2763 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2764 if (r < 0)
2765 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2766
2767 return 0;
2768 }
2769
2770 static int link_set_ipv6_accept_ra(Link *link) {
2771 int r;
2772
2773 /* Make this a NOP if IPv6 is not available */
2774 if (!socket_ipv6_is_supported())
2775 return 0;
2776
2777 if (link->flags & IFF_LOOPBACK)
2778 return 0;
2779
2780 if (!link->network)
2781 return 0;
2782
2783 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2784 if (r < 0)
2785 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2786
2787 return 0;
2788 }
2789
2790 static int link_set_ipv6_dad_transmits(Link *link) {
2791 int r;
2792
2793 /* Make this a NOP if IPv6 is not available */
2794 if (!socket_ipv6_is_supported())
2795 return 0;
2796
2797 if (link->flags & IFF_LOOPBACK)
2798 return 0;
2799
2800 if (!link->network)
2801 return 0;
2802
2803 if (link->network->ipv6_dad_transmits < 0)
2804 return 0;
2805
2806 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2807 if (r < 0)
2808 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2809
2810 return 0;
2811 }
2812
2813 static int link_set_ipv6_hop_limit(Link *link) {
2814 int r;
2815
2816 /* Make this a NOP if IPv6 is not available */
2817 if (!socket_ipv6_is_supported())
2818 return 0;
2819
2820 if (link->flags & IFF_LOOPBACK)
2821 return 0;
2822
2823 if (!link->network)
2824 return 0;
2825
2826 if (link->network->ipv6_hop_limit < 0)
2827 return 0;
2828
2829 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2830 if (r < 0)
2831 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2832
2833 return 0;
2834 }
2835
2836 static int link_set_ipv6_mtu(Link *link) {
2837 int r;
2838
2839 /* Make this a NOP if IPv6 is not available */
2840 if (!socket_ipv6_is_supported())
2841 return 0;
2842
2843 if (link->flags & IFF_LOOPBACK)
2844 return 0;
2845
2846 if (link->network->ipv6_mtu == 0)
2847 return 0;
2848
2849 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2850 if (r < 0)
2851 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2852
2853 return 0;
2854 }
2855
2856 static bool link_is_static_address_configured(Link *link, Address *address) {
2857 Address *net_address;
2858
2859 assert(link);
2860 assert(address);
2861
2862 if (!link->network)
2863 return false;
2864
2865 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2866 if (address_equal(net_address, address))
2867 return true;
2868
2869 return false;
2870 }
2871
2872 static bool link_is_static_route_configured(Link *link, Route *route) {
2873 Route *net_route;
2874
2875 assert(link);
2876 assert(route);
2877
2878 if (!link->network)
2879 return false;
2880
2881 LIST_FOREACH(routes, net_route, link->network->static_routes)
2882 if (route_equal(net_route, route))
2883 return true;
2884
2885 return false;
2886 }
2887
2888 static int link_drop_foreign_config(Link *link) {
2889 Address *address;
2890 Route *route;
2891 Iterator i;
2892 int r;
2893
2894 SET_FOREACH(address, link->addresses_foreign, i) {
2895 /* we consider IPv6LL addresses to be managed by the kernel */
2896 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2897 continue;
2898
2899 if (link_is_static_address_configured(link, address)) {
2900 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2901 if (r < 0)
2902 return log_link_error_errno(link, r, "Failed to add address: %m");
2903 } else {
2904 r = address_remove(address, link, NULL);
2905 if (r < 0)
2906 return r;
2907 }
2908 }
2909
2910 SET_FOREACH(route, link->routes_foreign, i) {
2911 /* do not touch routes managed by the kernel */
2912 if (route->protocol == RTPROT_KERNEL)
2913 continue;
2914
2915 if (link_is_static_route_configured(link, route)) {
2916 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2917 if (r < 0)
2918 return r;
2919 } else {
2920 r = route_remove(route, link, NULL);
2921 if (r < 0)
2922 return r;
2923 }
2924 }
2925
2926 return 0;
2927 }
2928
2929 static int link_drop_config(Link *link) {
2930 Address *address, *pool_address;
2931 Route *route;
2932 Iterator i;
2933 int r;
2934
2935 SET_FOREACH(address, link->addresses, i) {
2936 /* we consider IPv6LL addresses to be managed by the kernel */
2937 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2938 continue;
2939
2940 r = address_remove(address, link, NULL);
2941 if (r < 0)
2942 return r;
2943
2944 /* If this address came from an address pool, clean up the pool */
2945 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2946 if (address_equal(address, pool_address)) {
2947 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2948 address_free(pool_address);
2949 break;
2950 }
2951 }
2952 }
2953
2954 SET_FOREACH(route, link->routes, i) {
2955 /* do not touch routes managed by the kernel */
2956 if (route->protocol == RTPROT_KERNEL)
2957 continue;
2958
2959 r = route_remove(route, link, NULL);
2960 if (r < 0)
2961 return r;
2962 }
2963
2964 ndisc_flush(link);
2965
2966 return 0;
2967 }
2968
2969 static int link_update_lldp(Link *link) {
2970 int r;
2971
2972 assert(link);
2973
2974 if (!link->lldp)
2975 return 0;
2976
2977 if (link->flags & IFF_UP) {
2978 r = sd_lldp_start(link->lldp);
2979 if (r > 0)
2980 log_link_debug(link, "Started LLDP.");
2981 } else {
2982 r = sd_lldp_stop(link->lldp);
2983 if (r > 0)
2984 log_link_debug(link, "Stopped LLDP.");
2985 }
2986
2987 return r;
2988 }
2989
2990 static int link_configure_can(Link *link) {
2991 int r;
2992
2993 if (streq_ptr(link->kind, "can")) {
2994 /* The CAN interface must be down to configure bitrate, etc... */
2995 if ((link->flags & IFF_UP)) {
2996 r = link_down(link);
2997 if (r < 0) {
2998 link_enter_failed(link);
2999 return r;
3000 }
3001
3002 return 0;
3003 }
3004
3005 return link_set_can(link);
3006 }
3007
3008 if (!(link->flags & IFF_UP)) {
3009 r = link_up_can(link);
3010 if (r < 0) {
3011 link_enter_failed(link);
3012 return r;
3013 }
3014 }
3015
3016 return 0;
3017 }
3018
3019 static int link_configure(Link *link) {
3020 int r;
3021
3022 assert(link);
3023 assert(link->network);
3024 assert(link->state == LINK_STATE_PENDING);
3025
3026 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
3027 return link_configure_can(link);
3028
3029 /* Drop foreign config, but ignore loopback or critical devices.
3030 * We do not want to remove loopback address or addresses used for root NFS. */
3031 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
3032 r = link_drop_foreign_config(link);
3033 if (r < 0)
3034 return r;
3035 }
3036
3037 r = link_set_proxy_arp(link);
3038 if (r < 0)
3039 return r;
3040
3041 r = ipv6_proxy_ndp_addresses_configure(link);
3042 if (r < 0)
3043 return r;
3044
3045 r = link_set_ipv4_forward(link);
3046 if (r < 0)
3047 return r;
3048
3049 r = link_set_ipv6_forward(link);
3050 if (r < 0)
3051 return r;
3052
3053 r = link_set_ipv6_privacy_extensions(link);
3054 if (r < 0)
3055 return r;
3056
3057 r = link_set_ipv6_accept_ra(link);
3058 if (r < 0)
3059 return r;
3060
3061 r = link_set_ipv6_dad_transmits(link);
3062 if (r < 0)
3063 return r;
3064
3065 r = link_set_ipv6_hop_limit(link);
3066 if (r < 0)
3067 return r;
3068
3069 r = link_set_flags(link);
3070 if (r < 0)
3071 return r;
3072
3073 r = link_set_ipv6_mtu(link);
3074 if (r < 0)
3075 return r;
3076
3077 if (link_ipv4ll_enabled(link)) {
3078 r = ipv4ll_configure(link);
3079 if (r < 0)
3080 return r;
3081 }
3082
3083 if (link_dhcp4_enabled(link)) {
3084 r = dhcp4_set_promote_secondaries(link);
3085 if (r < 0)
3086 return r;
3087
3088 r = dhcp4_configure(link);
3089 if (r < 0)
3090 return r;
3091 }
3092
3093 if (link_dhcp4_server_enabled(link)) {
3094 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
3095 if (r < 0)
3096 return r;
3097
3098 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
3099 if (r < 0)
3100 return r;
3101 }
3102
3103 if (link_dhcp6_enabled(link) ||
3104 link_ipv6_accept_ra_enabled(link)) {
3105 r = dhcp6_configure(link);
3106 if (r < 0)
3107 return r;
3108 }
3109
3110 if (link_ipv6_accept_ra_enabled(link)) {
3111 r = ndisc_configure(link);
3112 if (r < 0)
3113 return r;
3114 }
3115
3116 if (link_radv_enabled(link)) {
3117 r = radv_configure(link);
3118 if (r < 0)
3119 return r;
3120 }
3121
3122 if (link_lldp_rx_enabled(link)) {
3123 r = sd_lldp_new(&link->lldp);
3124 if (r < 0)
3125 return r;
3126
3127 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
3128 if (r < 0)
3129 return r;
3130
3131 r = sd_lldp_match_capabilities(link->lldp,
3132 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
3133 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
3134 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
3135 if (r < 0)
3136 return r;
3137
3138 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
3139 if (r < 0)
3140 return r;
3141
3142 r = sd_lldp_attach_event(link->lldp, NULL, 0);
3143 if (r < 0)
3144 return r;
3145
3146 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
3147 if (r < 0)
3148 return r;
3149
3150 r = link_update_lldp(link);
3151 if (r < 0)
3152 return r;
3153 }
3154
3155 r = link_set_mtu(link, link->network->mtu, link->network->mtu_is_set);
3156 if (r < 0)
3157 return r;
3158
3159 if (socket_ipv6_is_supported()) {
3160 r = link_configure_addrgen_mode(link);
3161 if (r < 0)
3162 return r;
3163 }
3164
3165 return link_configure_after_setting_mtu(link);
3166 }
3167
3168 static int link_configure_after_setting_mtu(Link *link) {
3169 int r;
3170
3171 assert(link);
3172 assert(link->network);
3173 assert(link->state == LINK_STATE_PENDING);
3174
3175 if (link->setting_mtu)
3176 return 0;
3177
3178 if (link_has_carrier(link) || link->network->configure_without_carrier) {
3179 r = link_acquire_conf(link);
3180 if (r < 0)
3181 return r;
3182 }
3183
3184 return link_enter_join_netdev(link);
3185 }
3186
3187 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3188 assert(duid);
3189
3190 if (duid->raw_data_len > 0)
3191 return 0;
3192
3193 if (duid->type != DUID_TYPE_UUID)
3194 return -EINVAL;
3195
3196 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3197 duid->raw_data_len = sizeof(sd_id128_t);
3198
3199 return 1;
3200 }
3201
3202 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3203 Manager *manager = userdata;
3204 const sd_bus_error *e;
3205 const void *a;
3206 size_t sz;
3207 DUID *duid;
3208 Link *link;
3209 int r;
3210
3211 assert(m);
3212 assert(manager);
3213
3214 e = sd_bus_message_get_error(m);
3215 if (e) {
3216 log_error_errno(sd_bus_error_get_errno(e),
3217 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3218 e->message);
3219 goto configure;
3220 }
3221
3222 r = sd_bus_message_read_array(m, 'y', &a, &sz);
3223 if (r < 0)
3224 goto configure;
3225
3226 if (sz != sizeof(sd_id128_t)) {
3227 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3228 goto configure;
3229 }
3230
3231 memcpy(&manager->product_uuid, a, sz);
3232 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3233 (void) duid_set_uuid(duid, manager->product_uuid);
3234
3235 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3236
3237 configure:
3238 while ((link = set_steal_first(manager->links_requesting_uuid))) {
3239 r = link_configure(link);
3240 if (r < 0)
3241 log_link_error_errno(link, r, "Failed to configure link: %m");
3242 }
3243
3244 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3245
3246 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3247 * even if the method fails. */
3248 manager->has_product_uuid = true;
3249
3250 return 1;
3251 }
3252
3253 static bool link_requires_uuid(Link *link) {
3254 const DUID *duid;
3255
3256 assert(link);
3257 assert(link->manager);
3258 assert(link->network);
3259
3260 duid = link_get_duid(link);
3261 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3262 return false;
3263
3264 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3265 return true;
3266
3267 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3268 return true;
3269
3270 return false;
3271 }
3272
3273 static int link_configure_duid(Link *link) {
3274 Manager *m;
3275 DUID *duid;
3276 int r;
3277
3278 assert(link);
3279 assert(link->manager);
3280 assert(link->network);
3281
3282 m = link->manager;
3283 duid = link_get_duid(link);
3284
3285 if (!link_requires_uuid(link))
3286 return 1;
3287
3288 if (m->has_product_uuid) {
3289 (void) duid_set_uuid(duid, m->product_uuid);
3290 return 1;
3291 }
3292
3293 if (!m->links_requesting_uuid) {
3294 r = manager_request_product_uuid(m, link);
3295 if (r < 0) {
3296 if (r == -ENOMEM)
3297 return r;
3298
3299 log_link_warning_errno(link, r,
3300 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3301 return 1;
3302 }
3303 } else {
3304 r = set_put(m->links_requesting_uuid, link);
3305 if (r < 0)
3306 return log_oom();
3307
3308 r = set_put(m->duids_requesting_uuid, duid);
3309 if (r < 0)
3310 return log_oom();
3311 }
3312
3313 return 0;
3314 }
3315
3316 static int link_initialized_and_synced(Link *link) {
3317 Network *network;
3318 int r;
3319
3320 assert(link);
3321 assert(link->ifname);
3322 assert(link->manager);
3323
3324 if (link->state != LINK_STATE_PENDING)
3325 return 1;
3326
3327 log_link_debug(link, "Link state is up-to-date");
3328
3329 r = link_new_bound_by_list(link);
3330 if (r < 0)
3331 return r;
3332
3333 r = link_handle_bound_by_list(link);
3334 if (r < 0)
3335 return r;
3336
3337 if (!link->network) {
3338 r = network_get(link->manager, link->sd_device, link->ifname,
3339 &link->mac, &network);
3340 if (r == -ENOENT) {
3341 link_enter_unmanaged(link);
3342 return 1;
3343 } else if (r == 0 && network->unmanaged) {
3344 link_enter_unmanaged(link);
3345 return 0;
3346 } else if (r < 0)
3347 return r;
3348
3349 if (link->flags & IFF_LOOPBACK) {
3350 if (network->link_local != ADDRESS_FAMILY_NO)
3351 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3352
3353 if (network->dhcp != ADDRESS_FAMILY_NO)
3354 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3355
3356 if (network->dhcp_server)
3357 log_link_debug(link, "Ignoring DHCP server for loopback link");
3358 }
3359
3360 r = network_apply(network, link);
3361 if (r < 0)
3362 return r;
3363 }
3364
3365 r = link_new_bound_to_list(link);
3366 if (r < 0)
3367 return r;
3368
3369 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3370 * link_configure() is called later asynchronously. */
3371 r = link_configure_duid(link);
3372 if (r <= 0)
3373 return r;
3374
3375 r = link_configure(link);
3376 if (r < 0)
3377 return r;
3378
3379 return 1;
3380 }
3381
3382 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3383 (void) link_initialized_and_synced(link);
3384 return 1;
3385 }
3386
3387 int link_initialized(Link *link, sd_device *device) {
3388 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3389 int r;
3390
3391 assert(link);
3392 assert(link->manager);
3393 assert(link->manager->rtnl);
3394 assert(device);
3395
3396 if (link->state != LINK_STATE_PENDING)
3397 return 0;
3398
3399 if (link->sd_device)
3400 return 0;
3401
3402 log_link_debug(link, "udev initialized link");
3403
3404 link->sd_device = sd_device_ref(device);
3405
3406 /* udev has initialized the link, but we don't know if we have yet
3407 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3408 * when it returns we know that the pending NEWLINKs have already been
3409 * processed and that we are up-to-date */
3410
3411 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3412 link->ifindex);
3413 if (r < 0)
3414 return r;
3415
3416 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3417 link_netlink_destroy_callback, link);
3418 if (r < 0)
3419 return r;
3420
3421 link_ref(link);
3422
3423 return 0;
3424 }
3425
3426 static int link_load(Link *link) {
3427 _cleanup_free_ char *network_file = NULL,
3428 *addresses = NULL,
3429 *routes = NULL,
3430 *dhcp4_address = NULL,
3431 *ipv4ll_address = NULL;
3432 union in_addr_union address;
3433 union in_addr_union route_dst;
3434 const char *p;
3435 int r;
3436
3437 assert(link);
3438
3439 r = parse_env_file(NULL, link->state_file,
3440 "NETWORK_FILE", &network_file,
3441 "ADDRESSES", &addresses,
3442 "ROUTES", &routes,
3443 "DHCP4_ADDRESS", &dhcp4_address,
3444 "IPV4LL_ADDRESS", &ipv4ll_address);
3445 if (r < 0 && r != -ENOENT)
3446 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3447
3448 if (network_file) {
3449 Network *network;
3450 char *suffix;
3451
3452 /* drop suffix */
3453 suffix = strrchr(network_file, '.');
3454 if (!suffix) {
3455 log_link_debug(link, "Failed to get network name from %s", network_file);
3456 goto network_file_fail;
3457 }
3458 *suffix = '\0';
3459
3460 r = network_get_by_name(link->manager, basename(network_file), &network);
3461 if (r < 0) {
3462 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3463 goto network_file_fail;
3464 }
3465
3466 r = network_apply(network, link);
3467 if (r < 0)
3468 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3469 }
3470
3471 network_file_fail:
3472
3473 if (addresses) {
3474 p = addresses;
3475
3476 for (;;) {
3477 _cleanup_free_ char *address_str = NULL;
3478 char *prefixlen_str;
3479 int family;
3480 unsigned char prefixlen;
3481
3482 r = extract_first_word(&p, &address_str, NULL, 0);
3483 if (r < 0) {
3484 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3485 continue;
3486 }
3487 if (r == 0)
3488 break;
3489
3490 prefixlen_str = strchr(address_str, '/');
3491 if (!prefixlen_str) {
3492 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3493 continue;
3494 }
3495
3496 *prefixlen_str++ = '\0';
3497
3498 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3499 if (r != 1) {
3500 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3501 continue;
3502 }
3503
3504 r = in_addr_from_string_auto(address_str, &family, &address);
3505 if (r < 0) {
3506 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3507 continue;
3508 }
3509
3510 r = address_add(link, family, &address, prefixlen, NULL);
3511 if (r < 0)
3512 return log_link_error_errno(link, r, "Failed to add address: %m");
3513 }
3514 }
3515
3516 if (routes) {
3517 p = routes;
3518
3519 for (;;) {
3520 Route *route;
3521 _cleanup_free_ char *route_str = NULL;
3522 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3523 usec_t lifetime;
3524 char *prefixlen_str;
3525 int family;
3526 unsigned char prefixlen, tos, table;
3527 uint32_t priority;
3528
3529 r = extract_first_word(&p, &route_str, NULL, 0);
3530 if (r < 0) {
3531 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3532 continue;
3533 }
3534 if (r == 0)
3535 break;
3536
3537 prefixlen_str = strchr(route_str, '/');
3538 if (!prefixlen_str) {
3539 log_link_debug(link, "Failed to parse route %s", route_str);
3540 continue;
3541 }
3542
3543 *prefixlen_str++ = '\0';
3544
3545 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3546 if (r != 5) {
3547 log_link_debug(link,
3548 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3549 prefixlen_str);
3550 continue;
3551 }
3552
3553 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3554 if (r < 0) {
3555 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3556 continue;
3557 }
3558
3559 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3560 if (r < 0)
3561 return log_link_error_errno(link, r, "Failed to add route: %m");
3562
3563 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3564 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3565 0, route_expire_handler, route);
3566 if (r < 0)
3567 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3568 }
3569
3570 route->lifetime = lifetime;
3571 sd_event_source_unref(route->expire);
3572 route->expire = TAKE_PTR(expire);
3573 }
3574 }
3575
3576 if (dhcp4_address) {
3577 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3578 if (r < 0) {
3579 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3580 goto dhcp4_address_fail;
3581 }
3582
3583 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3584 if (r < 0)
3585 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3586
3587 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3588 if (r < 0)
3589 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3590 }
3591
3592 dhcp4_address_fail:
3593
3594 if (ipv4ll_address) {
3595 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3596 if (r < 0) {
3597 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3598 goto ipv4ll_address_fail;
3599 }
3600
3601 r = sd_ipv4ll_new(&link->ipv4ll);
3602 if (r < 0)
3603 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3604
3605 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3606 if (r < 0)
3607 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3608 }
3609
3610 ipv4ll_address_fail:
3611
3612 return 0;
3613 }
3614
3615 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3616 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3617 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3618 Link *link;
3619 int r;
3620
3621 assert(m);
3622 assert(m->rtnl);
3623 assert(message);
3624 assert(ret);
3625
3626 r = link_new(m, message, ret);
3627 if (r < 0)
3628 return r;
3629
3630 link = *ret;
3631
3632 log_link_debug(link, "Link %d added", link->ifindex);
3633
3634 r = link_load(link);
3635 if (r < 0)
3636 return r;
3637
3638 if (detect_container() <= 0) {
3639 /* not in a container, udev will be around */
3640 sprintf(ifindex_str, "n%d", link->ifindex);
3641 r = sd_device_new_from_device_id(&device, ifindex_str);
3642 if (r < 0) {
3643 log_link_warning_errno(link, r, "Could not find device: %m");
3644 goto failed;
3645 }
3646
3647 r = sd_device_get_is_initialized(device);
3648 if (r < 0) {
3649 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3650 goto failed;
3651 }
3652 if (r == 0) {
3653 /* not yet ready */
3654 log_link_debug(link, "link pending udev initialization...");
3655 return 0;
3656 }
3657
3658 r = device_is_renaming(device);
3659 if (r < 0) {
3660 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3661 goto failed;
3662 }
3663 if (r > 0) {
3664 log_link_debug(link, "Interface is under renaming, pending initialization.");
3665 return 0;
3666 }
3667
3668 r = link_initialized(link, device);
3669 if (r < 0)
3670 goto failed;
3671 } else {
3672 r = link_initialized_and_synced(link);
3673 if (r < 0)
3674 goto failed;
3675 }
3676
3677 return 0;
3678 failed:
3679 link_enter_failed(link);
3680 return r;
3681 }
3682
3683 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3684 int r;
3685
3686 assert(link);
3687
3688 log_link_info(link, "Gained IPv6LL");
3689
3690 link->ipv6ll_address = *address;
3691 link_check_ready(link);
3692
3693 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3694 r = link_acquire_ipv6_conf(link);
3695 if (r < 0) {
3696 link_enter_failed(link);
3697 return r;
3698 }
3699 }
3700
3701 return 0;
3702 }
3703
3704 static int link_carrier_gained(Link *link) {
3705 int r;
3706
3707 assert(link);
3708
3709 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3710 r = link_acquire_conf(link);
3711 if (r < 0) {
3712 link_enter_failed(link);
3713 return r;
3714 }
3715
3716 r = link_request_set_addresses(link);
3717 if (r < 0)
3718 return r;
3719 }
3720
3721 r = link_handle_bound_by_list(link);
3722 if (r < 0)
3723 return r;
3724
3725 return 0;
3726 }
3727
3728 static int link_carrier_lost(Link *link) {
3729 int r;
3730
3731 assert(link);
3732
3733 if (link->network && link->network->ignore_carrier_loss)
3734 return 0;
3735
3736 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3737 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3738 * configuration and stop the clients as well. */
3739 if (link->setting_mtu)
3740 return 0;
3741
3742 r = link_stop_clients(link);
3743 if (r < 0) {
3744 link_enter_failed(link);
3745 return r;
3746 }
3747
3748 if (link_dhcp4_server_enabled(link))
3749 (void) sd_dhcp_server_stop(link->dhcp_server);
3750
3751 r = link_drop_config(link);
3752 if (r < 0)
3753 return r;
3754
3755 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3756 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3757 r = link_drop_foreign_config(link);
3758 if (r < 0)
3759 return r;
3760 }
3761
3762 r = link_handle_bound_by_list(link);
3763 if (r < 0)
3764 return r;
3765
3766 return 0;
3767 }
3768
3769 int link_carrier_reset(Link *link) {
3770 int r;
3771
3772 assert(link);
3773
3774 if (link_has_carrier(link)) {
3775 r = link_carrier_lost(link);
3776 if (r < 0)
3777 return r;
3778
3779 r = link_carrier_gained(link);
3780 if (r < 0)
3781 return r;
3782
3783 log_link_info(link, "Reset carrier");
3784 }
3785
3786 return 0;
3787 }
3788
3789 int link_update(Link *link, sd_netlink_message *m) {
3790 struct ether_addr mac;
3791 const char *ifname;
3792 uint32_t mtu;
3793 bool had_carrier, carrier_gained, carrier_lost;
3794 int r;
3795
3796 assert(link);
3797 assert(link->ifname);
3798 assert(m);
3799
3800 if (link->state == LINK_STATE_LINGER) {
3801 log_link_info(link, "Link readded");
3802 link_set_state(link, LINK_STATE_CONFIGURING);
3803
3804 r = link_new_carrier_maps(link);
3805 if (r < 0)
3806 return r;
3807 }
3808
3809 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3810 if (r >= 0 && !streq(ifname, link->ifname)) {
3811 Manager *manager = link->manager;
3812
3813 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3814
3815 link_drop(link);
3816 r = link_add(manager, m, &link);
3817 if (r < 0)
3818 return r;
3819 }
3820
3821 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3822 if (r >= 0 && mtu > 0) {
3823 link->mtu = mtu;
3824 if (link->original_mtu == 0) {
3825 link->original_mtu = mtu;
3826 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3827 }
3828
3829 if (link->dhcp_client) {
3830 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3831 link->mtu);
3832 if (r < 0)
3833 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3834 }
3835
3836 if (link->radv) {
3837 r = sd_radv_set_mtu(link->radv, link->mtu);
3838 if (r < 0)
3839 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3840 }
3841 }
3842
3843 /* The kernel may broadcast NEWLINK messages without the MAC address
3844 set, simply ignore them. */
3845 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3846 if (r >= 0) {
3847 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3848 ETH_ALEN)) {
3849
3850 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3851 ETH_ALEN);
3852
3853 log_link_debug(link, "MAC address: "
3854 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3855 mac.ether_addr_octet[0],
3856 mac.ether_addr_octet[1],
3857 mac.ether_addr_octet[2],
3858 mac.ether_addr_octet[3],
3859 mac.ether_addr_octet[4],
3860 mac.ether_addr_octet[5]);
3861
3862 if (link->ipv4ll) {
3863 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3864 if (r < 0)
3865 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3866 }
3867
3868 if (link->dhcp_client) {
3869 r = sd_dhcp_client_set_mac(link->dhcp_client,
3870 (const uint8_t *) &link->mac,
3871 sizeof (link->mac),
3872 ARPHRD_ETHER);
3873 if (r < 0)
3874 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3875
3876 r = dhcp4_set_client_identifier(link);
3877 if (r < 0)
3878 return r;
3879 }
3880
3881 if (link->dhcp6_client) {
3882 const DUID* duid = link_get_duid(link);
3883
3884 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3885 (const uint8_t *) &link->mac,
3886 sizeof (link->mac),
3887 ARPHRD_ETHER);
3888 if (r < 0)
3889 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3890
3891 if (link->network->iaid_set) {
3892 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3893 link->network->iaid);
3894 if (r < 0)
3895 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3896 }
3897
3898 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3899 duid->type,
3900 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3901 duid->raw_data_len);
3902 if (r < 0)
3903 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3904 }
3905
3906 if (link->radv) {
3907 r = sd_radv_set_mac(link->radv, &link->mac);
3908 if (r < 0)
3909 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3910 }
3911
3912 if (link->ndisc) {
3913 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3914 if (r < 0)
3915 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3916 }
3917 }
3918 }
3919
3920 had_carrier = link_has_carrier(link);
3921
3922 r = link_update_flags(link, m);
3923 if (r < 0)
3924 return r;
3925
3926 r = link_update_lldp(link);
3927 if (r < 0)
3928 return r;
3929
3930 carrier_gained = !had_carrier && link_has_carrier(link);
3931 carrier_lost = had_carrier && !link_has_carrier(link);
3932
3933 if (carrier_gained) {
3934 log_link_info(link, "Gained carrier");
3935
3936 r = link_carrier_gained(link);
3937 if (r < 0)
3938 return r;
3939 } else if (carrier_lost) {
3940 log_link_info(link, "Lost carrier");
3941
3942 r = link_carrier_lost(link);
3943 if (r < 0)
3944 return r;
3945 }
3946
3947 return 0;
3948 }
3949
3950 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3951 bool space = false;
3952 Iterator i;
3953 Link *link;
3954
3955 assert(f);
3956 assert(prefix);
3957
3958 if (hashmap_isempty(h))
3959 return;
3960
3961 fputs(prefix, f);
3962 HASHMAP_FOREACH(link, h, i) {
3963 if (space)
3964 fputc(' ', f);
3965
3966 fprintf(f, "%i", link->ifindex);
3967 space = true;
3968 }
3969
3970 fputc('\n', f);
3971 }
3972
3973 int link_save(Link *link) {
3974 _cleanup_free_ char *temp_path = NULL;
3975 _cleanup_fclose_ FILE *f = NULL;
3976 const char *admin_state, *oper_state;
3977 Address *a;
3978 Route *route;
3979 Iterator i;
3980 int r;
3981
3982 assert(link);
3983 assert(link->state_file);
3984 assert(link->lease_file);
3985 assert(link->manager);
3986
3987 if (link->state == LINK_STATE_LINGER) {
3988 unlink(link->state_file);
3989 return 0;
3990 }
3991
3992 link_lldp_save(link);
3993
3994 admin_state = link_state_to_string(link->state);
3995 assert(admin_state);
3996
3997 oper_state = link_operstate_to_string(link->operstate);
3998 assert(oper_state);
3999
4000 r = fopen_temporary(link->state_file, &f, &temp_path);
4001 if (r < 0)
4002 goto fail;
4003
4004 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
4005 (void) fchmod(fileno(f), 0644);
4006
4007 fprintf(f,
4008 "# This is private data. Do not parse.\n"
4009 "ADMIN_STATE=%s\n"
4010 "OPER_STATE=%s\n",
4011 admin_state, oper_state);
4012
4013 if (link->network) {
4014 bool space;
4015 sd_dhcp6_lease *dhcp6_lease = NULL;
4016 const char *dhcp_domainname = NULL;
4017 char **dhcp6_domains = NULL;
4018 char **dhcp_domains = NULL;
4019 unsigned j;
4020
4021 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4022 yes_no(link->network->required_for_online));
4023
4024 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
4025 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
4026
4027 if (link->dhcp6_client) {
4028 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
4029 if (r < 0 && r != -ENOMSG)
4030 log_link_debug(link, "No DHCPv6 lease");
4031 }
4032
4033 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4034
4035 fputs("DNS=", f);
4036 space = false;
4037
4038 for (j = 0; j < link->network->n_dns; j++) {
4039 _cleanup_free_ char *b = NULL;
4040
4041 r = in_addr_to_string(link->network->dns[j].family,
4042 &link->network->dns[j].address, &b);
4043 if (r < 0) {
4044 log_debug_errno(r, "Failed to format address, ignoring: %m");
4045 continue;
4046 }
4047
4048 if (space)
4049 fputc(' ', f);
4050 fputs(b, f);
4051 space = true;
4052 }
4053
4054 if (link->network->dhcp_use_dns &&
4055 link->dhcp_lease) {
4056 const struct in_addr *addresses;
4057
4058 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
4059 if (r > 0)
4060 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4061 space = true;
4062 }
4063
4064 if (link->network->dhcp_use_dns && dhcp6_lease) {
4065 struct in6_addr *in6_addrs;
4066
4067 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
4068 if (r > 0) {
4069 if (space)
4070 fputc(' ', f);
4071 serialize_in6_addrs(f, in6_addrs, r);
4072 space = true;
4073 }
4074 }
4075
4076 /* Make sure to flush out old entries before we use the NDISC data */
4077 ndisc_vacuum(link);
4078
4079 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4080 NDiscRDNSS *dd;
4081
4082 SET_FOREACH(dd, link->ndisc_rdnss, i) {
4083 if (space)
4084 fputc(' ', f);
4085
4086 serialize_in6_addrs(f, &dd->address, 1);
4087 space = true;
4088 }
4089 }
4090
4091 fputc('\n', f);
4092
4093 fputs("NTP=", f);
4094 space = false;
4095 fputstrv(f, link->network->ntp, NULL, &space);
4096
4097 if (link->network->dhcp_use_ntp &&
4098 link->dhcp_lease) {
4099 const struct in_addr *addresses;
4100
4101 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
4102 if (r > 0)
4103 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
4104 space = true;
4105 }
4106
4107 if (link->network->dhcp_use_ntp && dhcp6_lease) {
4108 struct in6_addr *in6_addrs;
4109 char **hosts;
4110
4111 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
4112 &in6_addrs);
4113 if (r > 0) {
4114 if (space)
4115 fputc(' ', f);
4116 serialize_in6_addrs(f, in6_addrs, r);
4117 space = true;
4118 }
4119
4120 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
4121 if (r > 0)
4122 fputstrv(f, hosts, NULL, &space);
4123 }
4124
4125 fputc('\n', f);
4126
4127 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4128 if (link->dhcp_lease) {
4129 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4130 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4131 }
4132 if (dhcp6_lease)
4133 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4134 }
4135
4136 ordered_set_print(f, "DOMAINS=", link->network->search_domains);
4137
4138 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
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 ordered_set_print(f, "ROUTE_DOMAINS=", link->network->route_domains);
4155
4156 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4157 NDiscDNSSL *dd;
4158
4159 if (dhcp_domainname)
4160 fputs_with_space(f, dhcp_domainname, NULL, &space);
4161 if (dhcp_domains)
4162 fputstrv(f, dhcp_domains, NULL, &space);
4163 if (dhcp6_domains)
4164 fputstrv(f, dhcp6_domains, NULL, &space);
4165
4166 SET_FOREACH(dd, link->ndisc_dnssl, i)
4167 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4168 }
4169
4170 fputc('\n', f);
4171
4172 fprintf(f, "LLMNR=%s\n",
4173 resolve_support_to_string(link->network->llmnr));
4174 fprintf(f, "MDNS=%s\n",
4175 resolve_support_to_string(link->network->mdns));
4176 if (link->network->dns_default_route >= 0)
4177 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
4178
4179 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4180 fprintf(f, "DNS_OVER_TLS=%s\n",
4181 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
4182
4183 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
4184 fprintf(f, "DNSSEC=%s\n",
4185 dnssec_mode_to_string(link->network->dnssec_mode));
4186
4187 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
4188 const char *n;
4189
4190 fputs("DNSSEC_NTA=", f);
4191 space = false;
4192 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
4193 fputs_with_space(f, n, NULL, &space);
4194 fputc('\n', f);
4195 }
4196
4197 fputs("ADDRESSES=", f);
4198 space = false;
4199 SET_FOREACH(a, link->addresses, i) {
4200 _cleanup_free_ char *address_str = NULL;
4201
4202 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4203 if (r < 0)
4204 goto fail;
4205
4206 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4207 space = true;
4208 }
4209 fputc('\n', f);
4210
4211 fputs("ROUTES=", f);
4212 space = false;
4213 SET_FOREACH(route, link->routes, i) {
4214 _cleanup_free_ char *route_str = NULL;
4215
4216 r = in_addr_to_string(route->family, &route->dst, &route_str);
4217 if (r < 0)
4218 goto fail;
4219
4220 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4221 space ? " " : "", route_str,
4222 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4223 space = true;
4224 }
4225
4226 fputc('\n', f);
4227 }
4228
4229 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4230 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4231
4232 if (link->dhcp_lease) {
4233 struct in_addr address;
4234 const char *tz = NULL;
4235
4236 assert(link->network);
4237
4238 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
4239 if (r >= 0)
4240 fprintf(f, "TIMEZONE=%s\n", tz);
4241
4242 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
4243 if (r >= 0) {
4244 fputs("DHCP4_ADDRESS=", f);
4245 serialize_in_addrs(f, &address, 1, false, NULL);
4246 fputc('\n', f);
4247 }
4248
4249 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4250 if (r < 0)
4251 goto fail;
4252
4253 fprintf(f,
4254 "DHCP_LEASE=%s\n",
4255 link->lease_file);
4256 } else
4257 unlink(link->lease_file);
4258
4259 if (link->ipv4ll) {
4260 struct in_addr address;
4261
4262 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4263 if (r >= 0) {
4264 fputs("IPV4LL_ADDRESS=", f);
4265 serialize_in_addrs(f, &address, 1, false, NULL);
4266 fputc('\n', f);
4267 }
4268 }
4269
4270 r = fflush_and_check(f);
4271 if (r < 0)
4272 goto fail;
4273
4274 if (rename(temp_path, link->state_file) < 0) {
4275 r = -errno;
4276 goto fail;
4277 }
4278
4279 return 0;
4280
4281 fail:
4282 (void) unlink(link->state_file);
4283 if (temp_path)
4284 (void) unlink(temp_path);
4285
4286 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4287 }
4288
4289 /* The serialized state in /run is no longer up-to-date. */
4290 void link_dirty(Link *link) {
4291 int r;
4292
4293 assert(link);
4294
4295 /* mark manager dirty as link is dirty */
4296 manager_dirty(link->manager);
4297
4298 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
4299 if (r < 0)
4300 /* allocation errors are ignored */
4301 return;
4302
4303 r = set_put(link->manager->dirty_links, link);
4304 if (r <= 0)
4305 /* don't take another ref if the link was already dirty */
4306 return;
4307
4308 link_ref(link);
4309 }
4310
4311 /* The serialized state in /run is up-to-date */
4312 void link_clean(Link *link) {
4313 assert(link);
4314 assert(link->manager);
4315
4316 link_unref(set_remove(link->manager->dirty_links, link));
4317 }
4318
4319 static const char* const link_state_table[_LINK_STATE_MAX] = {
4320 [LINK_STATE_PENDING] = "pending",
4321 [LINK_STATE_CONFIGURING] = "configuring",
4322 [LINK_STATE_CONFIGURED] = "configured",
4323 [LINK_STATE_UNMANAGED] = "unmanaged",
4324 [LINK_STATE_FAILED] = "failed",
4325 [LINK_STATE_LINGER] = "linger",
4326 };
4327
4328 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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