]> git.ipfire.org Git - thirdparty/systemd.git/blob - src/network/networkd-link.c
projects / thirdparty / systemd.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
util: drop missing.h from socket-util.h
[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 "netlink-util.h"
18 #include "network-internal.h"
19 #include "networkd-ipv6-proxy-ndp.h"
20 #include "networkd-lldp-tx.h"
21 #include "networkd-manager.h"
22 #include "networkd-ndisc.h"
23 #include "networkd-radv.h"
24 #include "networkd-routing-policy-rule.h"
25 #include "set.h"
26 #include "socket-util.h"
27 #include "stdio-util.h"
28 #include "string-table.h"
29 #include "strv.h"
30 #include "tmpfile-util.h"
31 #include "util.h"
32 #include "virt.h"
33
34 DUID* link_get_duid(Link *link) {
35 if (link->network->duid.type != _DUID_TYPE_INVALID)
36 return &link->network->duid;
37 else
38 return &link->manager->duid;
39 }
40
41 static bool link_dhcp6_enabled(Link *link) {
42 assert(link);
43
44 if (!socket_ipv6_is_supported())
45 return false;
46
47 if (link->flags & IFF_LOOPBACK)
48 return false;
49
50 if (!link->network)
51 return false;
52
53 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
54 }
55
56 static bool link_dhcp4_enabled(Link *link) {
57 assert(link);
58
59 if (link->flags & IFF_LOOPBACK)
60 return false;
61
62 if (!link->network)
63 return false;
64
65 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
66 }
67
68 static bool link_dhcp4_server_enabled(Link *link) {
69 assert(link);
70
71 if (link->flags & IFF_LOOPBACK)
72 return false;
73
74 if (!link->network)
75 return false;
76
77 return link->network->dhcp_server;
78 }
79
80 static bool link_ipv4ll_enabled(Link *link) {
81 assert(link);
82
83 if (link->flags & IFF_LOOPBACK)
84 return false;
85
86 if (!link->network)
87 return false;
88
89 if (streq_ptr(link->kind, "wireguard"))
90 return false;
91
92 return link->network->link_local & ADDRESS_FAMILY_IPV4;
93 }
94
95 static bool link_ipv6ll_enabled(Link *link) {
96 assert(link);
97
98 if (!socket_ipv6_is_supported())
99 return false;
100
101 if (link->flags & IFF_LOOPBACK)
102 return false;
103
104 if (!link->network)
105 return false;
106
107 if (streq_ptr(link->kind, "wireguard"))
108 return false;
109
110 return link->network->link_local & ADDRESS_FAMILY_IPV6;
111 }
112
113 static bool link_ipv6_enabled(Link *link) {
114 assert(link);
115
116 if (!socket_ipv6_is_supported())
117 return false;
118
119 if (link->network->bridge)
120 return false;
121
122 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
123 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
124 }
125
126 static bool link_radv_enabled(Link *link) {
127 assert(link);
128
129 if (!link_ipv6ll_enabled(link))
130 return false;
131
132 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
133 }
134
135 static bool link_lldp_rx_enabled(Link *link) {
136 assert(link);
137
138 if (link->flags & IFF_LOOPBACK)
139 return false;
140
141 if (link->iftype != ARPHRD_ETHER)
142 return false;
143
144 if (!link->network)
145 return false;
146
147 /* LLDP should be handled on bridge slaves as those have a direct
148 * connection to their peers not on the bridge master. Linux doesn't
149 * even (by default) forward lldp packets to the bridge master.*/
150 if (streq_ptr("bridge", link->kind))
151 return false;
152
153 return link->network->lldp_mode != LLDP_MODE_NO;
154 }
155
156 static bool link_lldp_emit_enabled(Link *link) {
157 assert(link);
158
159 if (link->flags & IFF_LOOPBACK)
160 return false;
161
162 if (link->iftype != ARPHRD_ETHER)
163 return false;
164
165 if (!link->network)
166 return false;
167
168 return link->network->lldp_emit != LLDP_EMIT_NO;
169 }
170
171 static bool link_ipv4_forward_enabled(Link *link) {
172 assert(link);
173
174 if (link->flags & IFF_LOOPBACK)
175 return false;
176
177 if (!link->network)
178 return false;
179
180 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
181 return false;
182
183 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
184 }
185
186 static bool link_ipv6_forward_enabled(Link *link) {
187 assert(link);
188
189 if (!socket_ipv6_is_supported())
190 return false;
191
192 if (link->flags & IFF_LOOPBACK)
193 return false;
194
195 if (!link->network)
196 return false;
197
198 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
199 return false;
200
201 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
202 }
203
204 static bool link_proxy_arp_enabled(Link *link) {
205 assert(link);
206
207 if (link->flags & IFF_LOOPBACK)
208 return false;
209
210 if (!link->network)
211 return false;
212
213 if (link->network->proxy_arp < 0)
214 return false;
215
216 return true;
217 }
218
219 static bool link_ipv6_accept_ra_enabled(Link *link) {
220 assert(link);
221
222 if (!socket_ipv6_is_supported())
223 return false;
224
225 if (link->flags & IFF_LOOPBACK)
226 return false;
227
228 if (!link->network)
229 return false;
230
231 if (!link_ipv6ll_enabled(link))
232 return false;
233
234 /* If unset use system default (enabled if local forwarding is disabled.
235 * disabled if local forwarding is enabled).
236 * If set, ignore or enforce RA independent of local forwarding state.
237 */
238 if (link->network->ipv6_accept_ra < 0)
239 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
240 return !link_ipv6_forward_enabled(link);
241 else if (link->network->ipv6_accept_ra > 0)
242 /* accept RA even if ip_forward is enabled */
243 return true;
244 else
245 /* ignore RA */
246 return false;
247 }
248
249 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
250 assert(link);
251
252 if (!socket_ipv6_is_supported())
253 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
254
255 if (link->flags & IFF_LOOPBACK)
256 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
257
258 if (!link->network)
259 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
260
261 return link->network->ipv6_privacy_extensions;
262 }
263
264 static int link_enable_ipv6(Link *link) {
265 const char *p = NULL;
266 bool disabled;
267 int r;
268
269 if (link->flags & IFF_LOOPBACK)
270 return 0;
271
272 disabled = !link_ipv6_enabled(link);
273
274 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/disable_ipv6");
275
276 r = write_string_file(p, one_zero(disabled), WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
277 if (r < 0)
278 log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m",
279 enable_disable(!disabled), link->ifname);
280 else
281 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
282
283 return 0;
284 }
285
286 void link_update_operstate(Link *link) {
287 LinkOperationalState operstate;
288 assert(link);
289
290 if (link->kernel_operstate == IF_OPER_DORMANT)
291 operstate = LINK_OPERSTATE_DORMANT;
292 else if (link_has_carrier(link)) {
293 Address *address;
294 uint8_t scope = RT_SCOPE_NOWHERE;
295 Iterator i;
296
297 /* if we have carrier, check what addresses we have */
298 SET_FOREACH(address, link->addresses, i) {
299 if (!address_is_ready(address))
300 continue;
301
302 if (address->scope < scope)
303 scope = address->scope;
304 }
305
306 /* for operstate we also take foreign addresses into account */
307 SET_FOREACH(address, link->addresses_foreign, i) {
308 if (!address_is_ready(address))
309 continue;
310
311 if (address->scope < scope)
312 scope = address->scope;
313 }
314
315 if (scope < RT_SCOPE_SITE)
316 /* universally accessible addresses found */
317 operstate = LINK_OPERSTATE_ROUTABLE;
318 else if (scope < RT_SCOPE_HOST)
319 /* only link or site local addresses found */
320 operstate = LINK_OPERSTATE_DEGRADED;
321 else
322 /* no useful addresses found */
323 operstate = LINK_OPERSTATE_CARRIER;
324 } else if (link->flags & IFF_UP)
325 operstate = LINK_OPERSTATE_NO_CARRIER;
326 else
327 operstate = LINK_OPERSTATE_OFF;
328
329 if (link->operstate != operstate) {
330 link->operstate = operstate;
331 link_send_changed(link, "OperationalState", NULL);
332 link_dirty(link);
333 }
334 }
335
336 #define FLAG_STRING(string, flag, old, new) \
337 (((old ^ new) & flag) \
338 ? ((old & flag) ? (" -" string) : (" +" string)) \
339 : "")
340
341 static int link_update_flags(Link *link, sd_netlink_message *m) {
342 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
343 uint8_t operstate;
344 int r;
345
346 assert(link);
347
348 r = sd_rtnl_message_link_get_flags(m, &flags);
349 if (r < 0)
350 return log_link_warning_errno(link, r, "Could not get link flags: %m");
351
352 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
353 if (r < 0)
354 /* if we got a message without operstate, take it to mean
355 the state was unchanged */
356 operstate = link->kernel_operstate;
357
358 if ((link->flags == flags) && (link->kernel_operstate == operstate))
359 return 0;
360
361 if (link->flags != flags) {
362 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",
363 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
364 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
365 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
366 FLAG_STRING("UP", IFF_UP, link->flags, flags),
367 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
368 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
369 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
370 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
371 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
372 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
373 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
374 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
375 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
376 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
377 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
378 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
379 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
380 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
381 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
382
383 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
384 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
385 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
386 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
387 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
388 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
389 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
390 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
391
392 /* link flags are currently at most 18 bits, let's align to
393 * printing 20 */
394 if (unknown_flags_added)
395 log_link_debug(link,
396 "Unknown link flags gained: %#.5x (ignoring)",
397 unknown_flags_added);
398
399 if (unknown_flags_removed)
400 log_link_debug(link,
401 "Unknown link flags lost: %#.5x (ignoring)",
402 unknown_flags_removed);
403 }
404
405 link->flags = flags;
406 link->kernel_operstate = operstate;
407
408 link_update_operstate(link);
409
410 return 0;
411 }
412
413 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_unref);
414
415 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
416 _cleanup_(link_unrefp) Link *link = NULL;
417 uint16_t type;
418 const char *ifname, *kind = NULL;
419 int r, ifindex;
420 unsigned short iftype;
421
422 assert(manager);
423 assert(message);
424 assert(ret);
425
426 /* check for link kind */
427 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
428 if (r == 0) {
429 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
430 r = sd_netlink_message_exit_container(message);
431 if (r < 0)
432 return r;
433 }
434
435 r = sd_netlink_message_get_type(message, &type);
436 if (r < 0)
437 return r;
438 else if (type != RTM_NEWLINK)
439 return -EINVAL;
440
441 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
442 if (r < 0)
443 return r;
444 else if (ifindex <= 0)
445 return -EINVAL;
446
447 r = sd_rtnl_message_link_get_type(message, &iftype);
448 if (r < 0)
449 return r;
450
451 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
452 if (r < 0)
453 return r;
454
455 link = new(Link, 1);
456 if (!link)
457 return -ENOMEM;
458
459 *link = (Link) {
460 .n_ref = 1,
461 .manager = manager,
462 .state = LINK_STATE_PENDING,
463 .rtnl_extended_attrs = true,
464 .ifindex = ifindex,
465 .iftype = iftype,
466 };
467
468 link->ifname = strdup(ifname);
469 if (!link->ifname)
470 return -ENOMEM;
471
472 if (kind) {
473 link->kind = strdup(kind);
474 if (!link->kind)
475 return -ENOMEM;
476 }
477
478 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
479 if (r < 0)
480 log_link_debug_errno(link, r, "New device has no master, continuing without");
481
482 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
483 if (r < 0)
484 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
485
486 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
487 return -ENOMEM;
488
489 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
490 return -ENOMEM;
491
492 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
493 return -ENOMEM;
494
495 r = hashmap_ensure_allocated(&manager->links, NULL);
496 if (r < 0)
497 return r;
498
499 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
500 if (r < 0)
501 return r;
502
503 r = link_update_flags(link, message);
504 if (r < 0)
505 return r;
506
507 *ret = TAKE_PTR(link);
508
509 return 0;
510 }
511
512 static void link_detach_from_manager(Link *link) {
513 if (!link || !link->manager)
514 return;
515
516 hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex));
517 set_remove(link->manager->links_requesting_uuid, link);
518 link_clean(link);
519
520 link->manager = NULL;
521 }
522
523 static Link *link_free(Link *link) {
524 Address *address;
525 Link *carrier;
526 Route *route;
527 Iterator i;
528
529 assert(link);
530
531 while ((route = set_first(link->routes)))
532 route_free(route);
533
534 while ((route = set_first(link->routes_foreign)))
535 route_free(route);
536
537 link->routes = set_free(link->routes);
538 link->routes_foreign = set_free(link->routes_foreign);
539
540 while ((address = set_first(link->addresses)))
541 address_free(address);
542
543 while ((address = set_first(link->addresses_foreign)))
544 address_free(address);
545
546 link->addresses = set_free(link->addresses);
547 link->addresses_foreign = set_free(link->addresses_foreign);
548
549 while ((address = link->pool_addresses)) {
550 LIST_REMOVE(addresses, link->pool_addresses, address);
551 address_free(address);
552 }
553
554 sd_dhcp_server_unref(link->dhcp_server);
555 sd_dhcp_client_unref(link->dhcp_client);
556 sd_dhcp_lease_unref(link->dhcp_lease);
557
558 link_lldp_emit_stop(link);
559
560 free(link->lease_file);
561
562 sd_lldp_unref(link->lldp);
563 free(link->lldp_file);
564
565 ndisc_flush(link);
566
567 sd_ipv4ll_unref(link->ipv4ll);
568 sd_dhcp6_client_unref(link->dhcp6_client);
569 sd_ndisc_unref(link->ndisc);
570 sd_radv_unref(link->radv);
571
572 link_detach_from_manager(link);
573
574 free(link->ifname);
575
576 free(link->kind);
577
578 (void) unlink(link->state_file);
579 free(link->state_file);
580
581 sd_device_unref(link->sd_device);
582
583 HASHMAP_FOREACH (carrier, link->bound_to_links, i)
584 hashmap_remove(link->bound_to_links, INT_TO_PTR(carrier->ifindex));
585 hashmap_free(link->bound_to_links);
586
587 HASHMAP_FOREACH (carrier, link->bound_by_links, i)
588 hashmap_remove(link->bound_by_links, INT_TO_PTR(carrier->ifindex));
589 hashmap_free(link->bound_by_links);
590
591 return mfree(link);
592 }
593
594 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
595
596 int link_get(Manager *m, int ifindex, Link **ret) {
597 Link *link;
598
599 assert(m);
600 assert(ifindex);
601 assert(ret);
602
603 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
604 if (!link)
605 return -ENODEV;
606
607 *ret = link;
608
609 return 0;
610 }
611
612 static void link_set_state(Link *link, LinkState state) {
613 assert(link);
614
615 if (link->state == state)
616 return;
617
618 link->state = state;
619
620 link_send_changed(link, "AdministrativeState", NULL);
621 }
622
623 static void link_enter_unmanaged(Link *link) {
624 assert(link);
625
626 log_link_debug(link, "Unmanaged");
627
628 link_set_state(link, LINK_STATE_UNMANAGED);
629
630 link_dirty(link);
631 }
632
633 static int link_stop_clients(Link *link) {
634 int r = 0, k;
635
636 assert(link);
637 assert(link->manager);
638 assert(link->manager->event);
639
640 if (link->dhcp_client) {
641 k = sd_dhcp_client_stop(link->dhcp_client);
642 if (k < 0)
643 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
644 }
645
646 if (link->ipv4ll) {
647 k = sd_ipv4ll_stop(link->ipv4ll);
648 if (k < 0)
649 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
650 }
651
652 if (link->dhcp6_client) {
653 k = sd_dhcp6_client_stop(link->dhcp6_client);
654 if (k < 0)
655 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
656 }
657
658 if (link->ndisc) {
659 k = sd_ndisc_stop(link->ndisc);
660 if (k < 0)
661 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
662 }
663
664 if (link->radv) {
665 k = sd_radv_stop(link->radv);
666 if (k < 0)
667 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
668 }
669
670 link_lldp_emit_stop(link);
671 return r;
672 }
673
674 void link_enter_failed(Link *link) {
675 assert(link);
676
677 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
678 return;
679
680 log_link_warning(link, "Failed");
681
682 link_set_state(link, LINK_STATE_FAILED);
683
684 link_stop_clients(link);
685
686 link_dirty(link);
687 }
688
689 static Address* link_find_dhcp_server_address(Link *link) {
690 Address *address;
691
692 assert(link);
693 assert(link->network);
694
695 /* The first statically configured address if there is any */
696 LIST_FOREACH(addresses, address, link->network->static_addresses) {
697
698 if (address->family != AF_INET)
699 continue;
700
701 if (in_addr_is_null(address->family, &address->in_addr))
702 continue;
703
704 return address;
705 }
706
707 /* If that didn't work, find a suitable address we got from the pool */
708 LIST_FOREACH(addresses, address, link->pool_addresses) {
709 if (address->family != AF_INET)
710 continue;
711
712 return address;
713 }
714
715 return NULL;
716 }
717
718 static void link_enter_configured(Link *link) {
719 assert(link);
720 assert(link->network);
721
722 if (link->state != LINK_STATE_SETTING_ROUTES)
723 return;
724
725 log_link_info(link, "Configured");
726
727 link_set_state(link, LINK_STATE_CONFIGURED);
728
729 link_dirty(link);
730 }
731
732 void link_check_ready(Link *link) {
733 Address *a;
734 Iterator i;
735
736 assert(link);
737
738 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
739 return;
740
741 if (!link->network)
742 return;
743
744 if (!link->static_routes_configured)
745 return;
746
747 if (!link->routing_policy_rules_configured)
748 return;
749
750 if (link_ipv4ll_enabled(link))
751 if (!link->ipv4ll_address ||
752 !link->ipv4ll_route)
753 return;
754
755 if (!link->network->bridge) {
756
757 if (link_ipv6ll_enabled(link))
758 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) > 0)
759 return;
760
761 if ((link_dhcp4_enabled(link) && !link_dhcp6_enabled(link) &&
762 !link->dhcp4_configured) ||
763 (link_dhcp6_enabled(link) && !link_dhcp4_enabled(link) &&
764 !link->dhcp6_configured) ||
765 (link_dhcp4_enabled(link) && link_dhcp6_enabled(link) &&
766 !link->dhcp4_configured && !link->dhcp6_configured))
767 return;
768
769 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
770 return;
771 }
772
773 SET_FOREACH(a, link->addresses, i)
774 if (!address_is_ready(a))
775 return;
776
777 if (link->state != LINK_STATE_CONFIGURED)
778 link_enter_configured(link);
779
780 return;
781 }
782
783 static int link_set_routing_policy_rule(Link *link) {
784 RoutingPolicyRule *rule, *rrule = NULL;
785 int r;
786
787 assert(link);
788 assert(link->network);
789
790 LIST_FOREACH(rules, rule, link->network->rules) {
791 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
792 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif,
793 rule->protocol, &rule->sport, &rule->dport, &rrule);
794 if (r == 0) {
795 (void) routing_policy_rule_make_local(link->manager, rrule);
796 continue;
797 }
798
799 r = routing_policy_rule_configure(rule, link, NULL, false);
800 if (r < 0) {
801 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
802 link_enter_failed(link);
803 return r;
804 }
805
806 link->routing_policy_rule_messages++;
807 }
808
809 routing_policy_rule_purge(link->manager, link);
810 if (link->routing_policy_rule_messages == 0) {
811 link->routing_policy_rules_configured = true;
812 link_check_ready(link);
813 } else
814 log_link_debug(link, "Setting routing policy rules");
815
816 return 0;
817 }
818
819 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
820 int r;
821
822 assert(link);
823 assert(link->route_messages > 0);
824 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
825 LINK_STATE_SETTING_ROUTES, LINK_STATE_FAILED,
826 LINK_STATE_LINGER));
827
828 link->route_messages--;
829
830 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
831 return 1;
832
833 r = sd_netlink_message_get_errno(m);
834 if (r < 0 && r != -EEXIST)
835 log_link_warning_errno(link, r, "Could not set route: %m");
836
837 if (link->route_messages == 0) {
838 log_link_debug(link, "Routes set");
839 link->static_routes_configured = true;
840 link_check_ready(link);
841 }
842
843 return 1;
844 }
845
846 static int link_enter_set_routes(Link *link) {
847 enum {
848 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
849 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
850 _PHASE_MAX
851 } phase;
852 Route *rt;
853 int r;
854
855 assert(link);
856 assert(link->network);
857 assert(link->state == LINK_STATE_SETTING_ADDRESSES);
858
859 (void) link_set_routing_policy_rule(link);
860
861 link_set_state(link, LINK_STATE_SETTING_ROUTES);
862
863 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
864 for (phase = 0; phase < _PHASE_MAX; phase++)
865 LIST_FOREACH(routes, rt, link->network->static_routes) {
866
867 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
868 continue;
869
870 r = route_configure(rt, link, route_handler);
871 if (r < 0) {
872 log_link_warning_errno(link, r, "Could not set routes: %m");
873 link_enter_failed(link);
874 return r;
875 }
876
877 link->route_messages++;
878 }
879
880 if (link->route_messages == 0) {
881 link->static_routes_configured = true;
882 link_check_ready(link);
883 } else
884 log_link_debug(link, "Setting routes");
885
886 return 0;
887 }
888
889 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
890 int r;
891
892 assert(rtnl);
893 assert(m);
894 assert(link);
895 assert(link->ifname);
896 assert(link->address_messages > 0);
897 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
898 LINK_STATE_FAILED, LINK_STATE_LINGER));
899
900 link->address_messages--;
901
902 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
903 return 1;
904
905 r = sd_netlink_message_get_errno(m);
906 if (r < 0 && r != -EEXIST)
907 log_link_warning_errno(link, r, "could not set address: %m");
908 else if (r >= 0)
909 manager_rtnl_process_address(rtnl, m, link->manager);
910
911 if (link->address_messages == 0) {
912 log_link_debug(link, "Addresses set");
913 link_enter_set_routes(link);
914 }
915
916 return 1;
917 }
918
919 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
920 _cleanup_free_ struct in_addr *addresses = NULL;
921 size_t n_addresses = 0, n_allocated = 0;
922 unsigned i;
923
924 log_debug("Copying DNS server information from %s", link->ifname);
925
926 if (!link->network)
927 return 0;
928
929 for (i = 0; i < link->network->n_dns; i++) {
930 struct in_addr ia;
931
932 /* Only look for IPv4 addresses */
933 if (link->network->dns[i].family != AF_INET)
934 continue;
935
936 ia = link->network->dns[i].address.in;
937
938 /* Never propagate obviously borked data */
939 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
940 continue;
941
942 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
943 return log_oom();
944
945 addresses[n_addresses++] = ia;
946 }
947
948 if (link->network->dhcp_use_dns && link->dhcp_lease) {
949 const struct in_addr *da = NULL;
950 int n;
951
952 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
953 if (n > 0) {
954
955 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
956 return log_oom();
957
958 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
959 n_addresses += n;
960 }
961 }
962
963 if (n_addresses <= 0)
964 return 0;
965
966 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
967 }
968
969 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
970 _cleanup_free_ struct in_addr *addresses = NULL;
971 size_t n_addresses = 0, n_allocated = 0;
972 char **a;
973
974 if (!link->network)
975 return 0;
976
977 log_debug("Copying NTP server information from %s", link->ifname);
978
979 STRV_FOREACH(a, link->network->ntp) {
980 struct in_addr ia;
981
982 /* Only look for IPv4 addresses */
983 if (inet_pton(AF_INET, *a, &ia) <= 0)
984 continue;
985
986 /* Never propagate obviously borked data */
987 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
988 continue;
989
990 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
991 return log_oom();
992
993 addresses[n_addresses++] = ia;
994 }
995
996 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
997 const struct in_addr *da = NULL;
998 int n;
999
1000 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1001 if (n > 0) {
1002
1003 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1004 return log_oom();
1005
1006 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
1007 n_addresses += n;
1008 }
1009 }
1010
1011 if (n_addresses <= 0)
1012 return 0;
1013
1014 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1015 }
1016
1017 static int link_set_bridge_fdb(Link *link) {
1018 FdbEntry *fdb_entry;
1019 int r;
1020
1021 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1022 r = fdb_entry_configure(link, fdb_entry);
1023 if (r < 0)
1024 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1025 }
1026
1027 return 0;
1028 }
1029
1030 static int link_enter_set_addresses(Link *link) {
1031 AddressLabel *label;
1032 Address *ad;
1033 int r;
1034
1035 assert(link);
1036 assert(link->network);
1037 assert(link->state != _LINK_STATE_INVALID);
1038
1039 r = link_set_bridge_fdb(link);
1040 if (r < 0)
1041 return r;
1042
1043 link_set_state(link, LINK_STATE_SETTING_ADDRESSES);
1044
1045 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1046 r = address_configure(ad, link, address_handler, false);
1047 if (r < 0) {
1048 log_link_warning_errno(link, r, "Could not set addresses: %m");
1049 link_enter_failed(link);
1050 return r;
1051 }
1052
1053 link->address_messages++;
1054 }
1055
1056 LIST_FOREACH(labels, label, link->network->address_labels) {
1057 r = address_label_configure(label, link, NULL, false);
1058 if (r < 0) {
1059 log_link_warning_errno(link, r, "Could not set address label: %m");
1060 link_enter_failed(link);
1061 return r;
1062 }
1063
1064 link->address_label_messages++;
1065 }
1066
1067 /* now that we can figure out a default address for the dhcp server,
1068 start it */
1069 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1070 Address *address;
1071 Link *uplink = NULL;
1072 bool acquired_uplink = false;
1073
1074 address = link_find_dhcp_server_address(link);
1075 if (!address) {
1076 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1077 link_enter_failed(link);
1078 return 0;
1079 }
1080
1081 /* use the server address' subnet as the pool */
1082 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1083 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1084 if (r < 0)
1085 return r;
1086
1087 /* TODO:
1088 r = sd_dhcp_server_set_router(link->dhcp_server,
1089 &main_address->in_addr.in);
1090 if (r < 0)
1091 return r;
1092 */
1093
1094 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1095 r = sd_dhcp_server_set_max_lease_time(
1096 link->dhcp_server,
1097 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1098 if (r < 0)
1099 return r;
1100 }
1101
1102 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1103 r = sd_dhcp_server_set_default_lease_time(
1104 link->dhcp_server,
1105 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1106 if (r < 0)
1107 return r;
1108 }
1109
1110 if (link->network->dhcp_server_emit_dns) {
1111
1112 if (link->network->n_dhcp_server_dns > 0)
1113 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1114 else {
1115 uplink = manager_find_uplink(link->manager, link);
1116 acquired_uplink = true;
1117
1118 if (!uplink) {
1119 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1120 r = 0;
1121 } else
1122 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1123 }
1124 if (r < 0)
1125 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1126 }
1127
1128 if (link->network->dhcp_server_emit_ntp) {
1129
1130 if (link->network->n_dhcp_server_ntp > 0)
1131 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1132 else {
1133 if (!acquired_uplink)
1134 uplink = manager_find_uplink(link->manager, link);
1135
1136 if (!uplink) {
1137 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1138 r = 0;
1139 } else
1140 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1141
1142 }
1143 if (r < 0)
1144 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1145 }
1146
1147 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1148 if (r < 0)
1149 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1150
1151 if (link->network->dhcp_server_emit_timezone) {
1152 _cleanup_free_ char *buffer = NULL;
1153 const char *tz = NULL;
1154
1155 if (link->network->dhcp_server_timezone)
1156 tz = link->network->dhcp_server_timezone;
1157 else {
1158 r = get_timezone(&buffer);
1159 if (r < 0)
1160 log_warning_errno(r, "Failed to determine timezone: %m");
1161 else
1162 tz = buffer;
1163 }
1164
1165 if (tz) {
1166 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1167 if (r < 0)
1168 return r;
1169 }
1170 }
1171
1172 r = sd_dhcp_server_start(link->dhcp_server);
1173 if (r < 0) {
1174 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1175
1176 link_enter_failed(link);
1177
1178 return 0;
1179 }
1180
1181 log_link_debug(link, "Offering DHCPv4 leases");
1182 }
1183
1184 if (link->address_messages == 0)
1185 link_enter_set_routes(link);
1186 else
1187 log_link_debug(link, "Setting addresses");
1188
1189 return 0;
1190 }
1191
1192 static int link_set_bridge_vlan(Link *link) {
1193 int r = 0;
1194
1195 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1196 if (r < 0)
1197 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1198
1199 return r;
1200 }
1201
1202 static int link_set_proxy_arp(Link *link) {
1203 const char *p = NULL;
1204 int r;
1205
1206 if (!link_proxy_arp_enabled(link))
1207 return 0;
1208
1209 p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/proxy_arp");
1210
1211 r = write_string_file(p, one_zero(link->network->proxy_arp), WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
1212 if (r < 0)
1213 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1214
1215 return 0;
1216 }
1217
1218 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1219 int r;
1220
1221 assert(link);
1222
1223 log_link_debug(link, "Set link");
1224
1225 r = sd_netlink_message_get_errno(m);
1226 if (r < 0 && r != -EEXIST) {
1227 log_link_error_errno(link, r, "Could not join netdev: %m");
1228 link_enter_failed(link);
1229 }
1230
1231 return 1;
1232 }
1233
1234 static int link_configure_after_setting_mtu(Link *link);
1235
1236 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1237 int r;
1238
1239 assert(m);
1240 assert(link);
1241 assert(link->ifname);
1242
1243 link->setting_mtu = false;
1244
1245 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1246 return 1;
1247
1248 r = sd_netlink_message_get_errno(m);
1249 if (r < 0) {
1250 log_link_warning_errno(link, r, "Could not set MTU: %m");
1251 return 1;
1252 }
1253
1254 log_link_debug(link, "Setting MTU done.");
1255
1256 if (link->state == LINK_STATE_PENDING)
1257 (void) link_configure_after_setting_mtu(link);
1258
1259 return 1;
1260 }
1261
1262 int link_set_mtu(Link *link, uint32_t mtu) {
1263 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1264 int r;
1265
1266 assert(link);
1267 assert(link->manager);
1268 assert(link->manager->rtnl);
1269
1270 if (link->mtu == mtu || link->setting_mtu)
1271 return 0;
1272
1273 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1274
1275 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1276 if (r < 0)
1277 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1278
1279 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1280 * for this interface, or if it is a bridge slave, then disable IPv6 else enable it. */
1281 (void) link_enable_ipv6(link);
1282
1283 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1284 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1285 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1286
1287 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1288 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1289
1290 mtu = IPV6_MIN_MTU;
1291 }
1292
1293 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1294 if (r < 0)
1295 return log_link_error_errno(link, r, "Could not append MTU: %m");
1296
1297 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1298 link_netlink_destroy_callback, link);
1299 if (r < 0)
1300 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1301
1302 link_ref(link);
1303 link->setting_mtu = true;
1304
1305 return 0;
1306 }
1307
1308 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1309 int r;
1310
1311 assert(m);
1312 assert(link);
1313 assert(link->ifname);
1314
1315 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1316 return 1;
1317
1318 r = sd_netlink_message_get_errno(m);
1319 if (r < 0)
1320 log_link_warning_errno(link, r, "Could not set link flags: %m");
1321
1322 return 1;
1323 }
1324
1325 static int link_set_flags(Link *link) {
1326 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1327 unsigned ifi_change = 0;
1328 unsigned ifi_flags = 0;
1329 int r;
1330
1331 assert(link);
1332 assert(link->manager);
1333 assert(link->manager->rtnl);
1334
1335 if (link->flags & IFF_LOOPBACK)
1336 return 0;
1337
1338 if (!link->network)
1339 return 0;
1340
1341 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1342 return 0;
1343
1344 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1345 if (r < 0)
1346 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1347
1348 if (link->network->arp >= 0) {
1349 ifi_change |= IFF_NOARP;
1350 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1351 }
1352
1353 if (link->network->multicast >= 0) {
1354 ifi_change |= IFF_MULTICAST;
1355 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1356 }
1357
1358 if (link->network->allmulticast >= 0) {
1359 ifi_change |= IFF_ALLMULTI;
1360 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1361 }
1362
1363 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1364 if (r < 0)
1365 return log_link_error_errno(link, r, "Could not set link flags: %m");
1366
1367 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1368 link_netlink_destroy_callback, link);
1369 if (r < 0)
1370 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1371
1372 link_ref(link);
1373
1374 return 0;
1375 }
1376
1377 static int link_set_bridge(Link *link) {
1378 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1379 int r;
1380
1381 assert(link);
1382 assert(link->network);
1383
1384 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1385 if (r < 0)
1386 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1387
1388 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1389 if (r < 0)
1390 return log_link_error_errno(link, r, "Could not set message family: %m");
1391
1392 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1393 if (r < 0)
1394 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1395
1396 if (link->network->use_bpdu >= 0) {
1397 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
1398 if (r < 0)
1399 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1400 }
1401
1402 if (link->network->hairpin >= 0) {
1403 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1404 if (r < 0)
1405 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1406 }
1407
1408 if (link->network->fast_leave >= 0) {
1409 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1410 if (r < 0)
1411 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1412 }
1413
1414 if (link->network->allow_port_to_be_root >= 0) {
1415 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
1416 if (r < 0)
1417 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1418
1419 }
1420
1421 if (link->network->unicast_flood >= 0) {
1422 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1423 if (r < 0)
1424 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1425
1426 }
1427
1428 if (link->network->cost != 0) {
1429 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1430 if (r < 0)
1431 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1432 }
1433 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1434 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1435 if (r < 0)
1436 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1437 }
1438
1439 r = sd_netlink_message_close_container(req);
1440 if (r < 0)
1441 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1442
1443 r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_handler,
1444 link_netlink_destroy_callback, link);
1445 if (r < 0)
1446 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1447
1448 link_ref(link);
1449
1450 return r;
1451 }
1452
1453 static int link_bond_set(Link *link) {
1454 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1455 int r;
1456
1457 assert(link);
1458 assert(link->network);
1459
1460 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1461 if (r < 0)
1462 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1463
1464 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1465 if (r < 0)
1466 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1467
1468 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1469 if (r < 0)
1470 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1471
1472 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1473 if (r < 0)
1474 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1475
1476 if (link->network->active_slave) {
1477 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1478 if (r < 0)
1479 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1480 }
1481
1482 if (link->network->primary_slave) {
1483 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1484 if (r < 0)
1485 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1486 }
1487
1488 r = sd_netlink_message_close_container(req);
1489 if (r < 0)
1490 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1491
1492 r = sd_netlink_message_close_container(req);
1493 if (r < 0)
1494 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1495
1496 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1497 link_netlink_destroy_callback, link);
1498 if (r < 0)
1499 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1500
1501 link_ref(link);
1502
1503 return r;
1504 }
1505
1506 static int link_lldp_save(Link *link) {
1507 _cleanup_free_ char *temp_path = NULL;
1508 _cleanup_fclose_ FILE *f = NULL;
1509 sd_lldp_neighbor **l = NULL;
1510 int n = 0, r, i;
1511
1512 assert(link);
1513 assert(link->lldp_file);
1514
1515 if (!link->lldp) {
1516 (void) unlink(link->lldp_file);
1517 return 0;
1518 }
1519
1520 r = sd_lldp_get_neighbors(link->lldp, &l);
1521 if (r < 0)
1522 goto finish;
1523 if (r == 0) {
1524 (void) unlink(link->lldp_file);
1525 goto finish;
1526 }
1527
1528 n = r;
1529
1530 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1531 if (r < 0)
1532 goto finish;
1533
1534 fchmod(fileno(f), 0644);
1535
1536 for (i = 0; i < n; i++) {
1537 const void *p;
1538 le64_t u;
1539 size_t sz;
1540
1541 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1542 if (r < 0)
1543 goto finish;
1544
1545 u = htole64(sz);
1546 (void) fwrite(&u, 1, sizeof(u), f);
1547 (void) fwrite(p, 1, sz, f);
1548 }
1549
1550 r = fflush_and_check(f);
1551 if (r < 0)
1552 goto finish;
1553
1554 if (rename(temp_path, link->lldp_file) < 0) {
1555 r = -errno;
1556 goto finish;
1557 }
1558
1559 finish:
1560 if (r < 0) {
1561 (void) unlink(link->lldp_file);
1562 if (temp_path)
1563 (void) unlink(temp_path);
1564
1565 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1566 }
1567
1568 if (l) {
1569 for (i = 0; i < n; i++)
1570 sd_lldp_neighbor_unref(l[i]);
1571 free(l);
1572 }
1573
1574 return r;
1575 }
1576
1577 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1578 Link *link = userdata;
1579 int r;
1580
1581 assert(link);
1582
1583 (void) link_lldp_save(link);
1584
1585 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1586 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1587
1588 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1589
1590 r = link_lldp_emit_start(link);
1591 if (r < 0)
1592 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1593 }
1594 }
1595
1596 static int link_acquire_ipv6_conf(Link *link) {
1597 int r;
1598
1599 assert(link);
1600
1601 if (link_ipv6_accept_ra_enabled(link)) {
1602 assert(link->ndisc);
1603
1604 log_link_debug(link, "Discovering IPv6 routers");
1605
1606 r = sd_ndisc_start(link->ndisc);
1607 if (r < 0 && r != -EBUSY)
1608 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1609 }
1610
1611 if (link_radv_enabled(link)) {
1612 assert(link->radv);
1613 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1614
1615 log_link_debug(link, "Starting IPv6 Router Advertisements");
1616
1617 r = sd_radv_start(link->radv);
1618 if (r < 0 && r != -EBUSY)
1619 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1620 }
1621
1622 (void) dhcp6_request_prefix_delegation(link);
1623
1624 return 0;
1625 }
1626
1627 static int link_acquire_ipv4_conf(Link *link) {
1628 int r;
1629
1630 assert(link);
1631 assert(link->network);
1632 assert(link->manager);
1633 assert(link->manager->event);
1634
1635 if (link_ipv4ll_enabled(link)) {
1636 assert(link->ipv4ll);
1637
1638 log_link_debug(link, "Acquiring IPv4 link-local address");
1639
1640 r = sd_ipv4ll_start(link->ipv4ll);
1641 if (r < 0)
1642 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1643 }
1644
1645 if (link_dhcp4_enabled(link)) {
1646 assert(link->dhcp_client);
1647
1648 log_link_debug(link, "Acquiring DHCPv4 lease");
1649
1650 r = sd_dhcp_client_start(link->dhcp_client);
1651 if (r < 0)
1652 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1653 }
1654
1655 return 0;
1656 }
1657
1658 static int link_acquire_conf(Link *link) {
1659 int r;
1660
1661 assert(link);
1662
1663 r = link_acquire_ipv4_conf(link);
1664 if (r < 0)
1665 return r;
1666
1667 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) == 0) {
1668 r = link_acquire_ipv6_conf(link);
1669 if (r < 0)
1670 return r;
1671 }
1672
1673 if (link_lldp_emit_enabled(link)) {
1674 r = link_lldp_emit_start(link);
1675 if (r < 0)
1676 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1677 }
1678
1679 return 0;
1680 }
1681
1682 bool link_has_carrier(Link *link) {
1683 /* see Documentation/networking/operstates.txt in the kernel sources */
1684
1685 if (link->kernel_operstate == IF_OPER_UP)
1686 return true;
1687
1688 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1689 /* operstate may not be implemented, so fall back to flags */
1690 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1691 return true;
1692
1693 return false;
1694 }
1695
1696 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1697 int r;
1698
1699 assert(link);
1700
1701 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1702 return 1;
1703
1704 r = sd_netlink_message_get_errno(m);
1705 if (r < 0)
1706 /* we warn but don't fail the link, as it may be brought up later */
1707 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1708
1709 return 1;
1710 }
1711
1712 int link_up(Link *link) {
1713 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1714 uint8_t ipv6ll_mode;
1715 int r;
1716
1717 assert(link);
1718 assert(link->network);
1719 assert(link->manager);
1720 assert(link->manager->rtnl);
1721
1722 log_link_debug(link, "Bringing link up");
1723
1724 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1725 if (r < 0)
1726 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1727
1728 /* set it free if not enslaved with networkd */
1729 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1730 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1731 if (r < 0)
1732 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1733 }
1734
1735 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1736 if (r < 0)
1737 return log_link_error_errno(link, r, "Could not set link flags: %m");
1738
1739 if (link->network->mac) {
1740 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1741 if (r < 0)
1742 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1743 }
1744
1745 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1746 if (r < 0)
1747 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1748
1749 if (link_ipv6_enabled(link)) {
1750 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
1751 r = sd_netlink_message_open_container(req, AF_INET6);
1752 if (r < 0)
1753 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1754
1755 if (!link_ipv6ll_enabled(link))
1756 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1757 else {
1758 const char *p = NULL;
1759 _cleanup_free_ char *stable_secret = NULL;
1760
1761 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/stable_secret");
1762 r = read_one_line_file(p, &stable_secret);
1763
1764 if (r < 0)
1765 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1766 else
1767 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1768 }
1769 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1770 if (r < 0)
1771 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1772
1773 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
1774 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
1775 if (r < 0)
1776 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
1777 }
1778
1779 r = sd_netlink_message_close_container(req);
1780 if (r < 0)
1781 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1782 }
1783
1784 r = sd_netlink_message_close_container(req);
1785 if (r < 0)
1786 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1787
1788 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1789 link_netlink_destroy_callback, link);
1790 if (r < 0)
1791 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1792
1793 link_ref(link);
1794
1795 return 0;
1796 }
1797
1798 static int link_up_can(Link *link) {
1799 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1800 int r;
1801
1802 assert(link);
1803
1804 log_link_debug(link, "Bringing CAN link up");
1805
1806 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1807 if (r < 0)
1808 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1809
1810 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1811 if (r < 0)
1812 return log_link_error_errno(link, r, "Could not set link flags: %m");
1813
1814 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1815 link_netlink_destroy_callback, link);
1816 if (r < 0)
1817 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1818
1819 link_ref(link);
1820
1821 return 0;
1822 }
1823
1824 static int link_set_can(Link *link) {
1825 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
1826 int r;
1827
1828 assert(link);
1829 assert(link->network);
1830 assert(link->manager);
1831 assert(link->manager->rtnl);
1832
1833 log_link_debug(link, "link_set_can");
1834
1835 r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
1836 if (r < 0)
1837 return log_link_error_errno(link, r, "Failed to allocate netlink message: %m");
1838
1839 r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
1840 if (r < 0)
1841 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1842
1843 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
1844 if (r < 0)
1845 return log_link_error_errno(link, r, "Failed to open netlink container: %m");
1846
1847 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
1848 if (r < 0)
1849 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1850
1851 if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) {
1852 struct can_bittiming bt = {
1853 .bitrate = link->network->can_bitrate,
1854 .sample_point = link->network->can_sample_point,
1855 };
1856
1857 if (link->network->can_bitrate > UINT32_MAX) {
1858 log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate);
1859 return -ERANGE;
1860 }
1861
1862 log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate);
1863 if (link->network->can_sample_point > 0)
1864 log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
1865 else
1866 log_link_debug(link, "Using default sample point");
1867
1868 r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
1869 if (r < 0)
1870 return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
1871 }
1872
1873 if (link->network->can_restart_us > 0) {
1874 char time_string[FORMAT_TIMESPAN_MAX];
1875 uint64_t restart_ms;
1876
1877 if (link->network->can_restart_us == USEC_INFINITY)
1878 restart_ms = 0;
1879 else
1880 restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC);
1881
1882 format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC);
1883
1884 if (restart_ms > UINT32_MAX) {
1885 log_link_error(link, "restart timeout (%s) too big.", time_string);
1886 return -ERANGE;
1887 }
1888
1889 log_link_debug(link, "Setting restart = %s", time_string);
1890
1891 r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
1892 if (r < 0)
1893 return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
1894 }
1895
1896 r = sd_netlink_message_close_container(m);
1897 if (r < 0)
1898 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
1899
1900 r = sd_netlink_message_close_container(m);
1901 if (r < 0)
1902 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
1903
1904 r = netlink_call_async(link->manager->rtnl, NULL, m, link_set_handler,
1905 link_netlink_destroy_callback, link);
1906 if (r < 0)
1907 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1908
1909 link_ref(link);
1910
1911 if (!(link->flags & IFF_UP)) {
1912 r = link_up_can(link);
1913 if (r < 0) {
1914 link_enter_failed(link);
1915 return r;
1916 }
1917 }
1918
1919 log_link_debug(link, "link_set_can done");
1920
1921 return r;
1922 }
1923
1924 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1925 int r;
1926
1927 assert(link);
1928
1929 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1930 return 1;
1931
1932 r = sd_netlink_message_get_errno(m);
1933 if (r < 0)
1934 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1935
1936 if (streq_ptr(link->kind, "can"))
1937 link_set_can(link);
1938
1939 return 1;
1940 }
1941
1942 int link_down(Link *link) {
1943 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1944 int r;
1945
1946 assert(link);
1947 assert(link->manager);
1948 assert(link->manager->rtnl);
1949
1950 log_link_debug(link, "Bringing link down");
1951
1952 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1953 RTM_SETLINK, link->ifindex);
1954 if (r < 0)
1955 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1956
1957 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1958 if (r < 0)
1959 return log_link_error_errno(link, r, "Could not set link flags: %m");
1960
1961 r = netlink_call_async(link->manager->rtnl, NULL, req, link_down_handler,
1962 link_netlink_destroy_callback, link);
1963 if (r < 0)
1964 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1965
1966 link_ref(link);
1967
1968 return 0;
1969 }
1970
1971 static int link_handle_bound_to_list(Link *link) {
1972 Link *l;
1973 Iterator i;
1974 int r;
1975 bool required_up = false;
1976 bool link_is_up = false;
1977
1978 assert(link);
1979
1980 if (hashmap_isempty(link->bound_to_links))
1981 return 0;
1982
1983 if (link->flags & IFF_UP)
1984 link_is_up = true;
1985
1986 HASHMAP_FOREACH (l, link->bound_to_links, i)
1987 if (link_has_carrier(l)) {
1988 required_up = true;
1989 break;
1990 }
1991
1992 if (!required_up && link_is_up) {
1993 r = link_down(link);
1994 if (r < 0)
1995 return r;
1996 } else if (required_up && !link_is_up) {
1997 r = link_up(link);
1998 if (r < 0)
1999 return r;
2000 }
2001
2002 return 0;
2003 }
2004
2005 static int link_handle_bound_by_list(Link *link) {
2006 Iterator i;
2007 Link *l;
2008 int r;
2009
2010 assert(link);
2011
2012 if (hashmap_isempty(link->bound_by_links))
2013 return 0;
2014
2015 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2016 r = link_handle_bound_to_list(l);
2017 if (r < 0)
2018 return r;
2019 }
2020
2021 return 0;
2022 }
2023
2024 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2025 int r;
2026
2027 assert(link);
2028 assert(carrier);
2029
2030 if (link == carrier)
2031 return 0;
2032
2033 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2034 return 0;
2035
2036 r = hashmap_ensure_allocated(h, NULL);
2037 if (r < 0)
2038 return r;
2039
2040 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2041 if (r < 0)
2042 return r;
2043
2044 return 0;
2045 }
2046
2047 static int link_new_bound_by_list(Link *link) {
2048 Manager *m;
2049 Link *carrier;
2050 Iterator i;
2051 int r;
2052 bool list_updated = false;
2053
2054 assert(link);
2055 assert(link->manager);
2056
2057 m = link->manager;
2058
2059 HASHMAP_FOREACH(carrier, m->links, i) {
2060 if (!carrier->network)
2061 continue;
2062
2063 if (strv_isempty(carrier->network->bind_carrier))
2064 continue;
2065
2066 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2067 r = link_put_carrier(link, carrier, &link->bound_by_links);
2068 if (r < 0)
2069 return r;
2070
2071 list_updated = true;
2072 }
2073 }
2074
2075 if (list_updated)
2076 link_dirty(link);
2077
2078 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2079 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2080 if (r < 0)
2081 return r;
2082
2083 link_dirty(carrier);
2084 }
2085
2086 return 0;
2087 }
2088
2089 static int link_new_bound_to_list(Link *link) {
2090 Manager *m;
2091 Link *carrier;
2092 Iterator i;
2093 int r;
2094 bool list_updated = false;
2095
2096 assert(link);
2097 assert(link->manager);
2098
2099 if (!link->network)
2100 return 0;
2101
2102 if (strv_isempty(link->network->bind_carrier))
2103 return 0;
2104
2105 m = link->manager;
2106
2107 HASHMAP_FOREACH (carrier, m->links, i) {
2108 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2109 r = link_put_carrier(link, carrier, &link->bound_to_links);
2110 if (r < 0)
2111 return r;
2112
2113 list_updated = true;
2114 }
2115 }
2116
2117 if (list_updated)
2118 link_dirty(link);
2119
2120 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2121 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2122 if (r < 0)
2123 return r;
2124
2125 link_dirty(carrier);
2126 }
2127
2128 return 0;
2129 }
2130
2131 static int link_new_carrier_maps(Link *link) {
2132 int r;
2133
2134 r = link_new_bound_by_list(link);
2135 if (r < 0)
2136 return r;
2137
2138 r = link_handle_bound_by_list(link);
2139 if (r < 0)
2140 return r;
2141
2142 r = link_new_bound_to_list(link);
2143 if (r < 0)
2144 return r;
2145
2146 r = link_handle_bound_to_list(link);
2147 if (r < 0)
2148 return r;
2149
2150 return 0;
2151 }
2152
2153 static void link_free_bound_to_list(Link *link) {
2154 Link *bound_to;
2155 Iterator i;
2156
2157 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2158 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2159
2160 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2161 link_dirty(bound_to);
2162 }
2163
2164 return;
2165 }
2166
2167 static void link_free_bound_by_list(Link *link) {
2168 Link *bound_by;
2169 Iterator i;
2170
2171 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2172 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2173
2174 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2175 link_dirty(bound_by);
2176 link_handle_bound_to_list(bound_by);
2177 }
2178 }
2179
2180 return;
2181 }
2182
2183 static void link_free_carrier_maps(Link *link) {
2184 bool list_updated = false;
2185
2186 assert(link);
2187
2188 if (!hashmap_isempty(link->bound_to_links)) {
2189 link_free_bound_to_list(link);
2190 list_updated = true;
2191 }
2192
2193 if (!hashmap_isempty(link->bound_by_links)) {
2194 link_free_bound_by_list(link);
2195 list_updated = true;
2196 }
2197
2198 if (list_updated)
2199 link_dirty(link);
2200
2201 return;
2202 }
2203
2204 void link_drop(Link *link) {
2205 if (!link || link->state == LINK_STATE_LINGER)
2206 return;
2207
2208 link_set_state(link, LINK_STATE_LINGER);
2209
2210 link_free_carrier_maps(link);
2211
2212 log_link_debug(link, "Link removed");
2213
2214 (void) unlink(link->state_file);
2215
2216 link_detach_from_manager(link);
2217
2218 link_unref(link);
2219
2220 return;
2221 }
2222
2223 static int link_joined(Link *link) {
2224 int r;
2225
2226 assert(link);
2227 assert(link->network);
2228
2229 if (!hashmap_isempty(link->bound_to_links)) {
2230 r = link_handle_bound_to_list(link);
2231 if (r < 0)
2232 return r;
2233 } else if (!(link->flags & IFF_UP)) {
2234 r = link_up(link);
2235 if (r < 0) {
2236 link_enter_failed(link);
2237 return r;
2238 }
2239 }
2240
2241 if (link->network->bridge) {
2242 r = link_set_bridge(link);
2243 if (r < 0)
2244 log_link_error_errno(link, r, "Could not set bridge message: %m");
2245 }
2246
2247 if (link->network->bond) {
2248 r = link_bond_set(link);
2249 if (r < 0)
2250 log_link_error_errno(link, r, "Could not set bond message: %m");
2251 }
2252
2253 if (link->network->use_br_vlan &&
2254 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2255 r = link_set_bridge_vlan(link);
2256 if (r < 0)
2257 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2258 }
2259
2260 /* Skip setting up addresses until it gets carrier,
2261 or it would try to set addresses twice,
2262 which is bad for non-idempotent steps. */
2263 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2264 return 0;
2265
2266 return link_enter_set_addresses(link);
2267 }
2268
2269 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2270 int r;
2271
2272 assert(link);
2273 assert(link->network);
2274
2275 link->enslaving--;
2276
2277 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2278 return 1;
2279
2280 r = sd_netlink_message_get_errno(m);
2281 if (r < 0 && r != -EEXIST) {
2282 log_link_error_errno(link, r, "Could not join netdev: %m");
2283 link_enter_failed(link);
2284 return 1;
2285 } else
2286 log_link_debug(link, "Joined netdev");
2287
2288 if (link->enslaving <= 0)
2289 link_joined(link);
2290
2291 return 1;
2292 }
2293
2294 static int link_enter_join_netdev(Link *link) {
2295 NetDev *netdev;
2296 Iterator i;
2297 int r;
2298
2299 assert(link);
2300 assert(link->network);
2301 assert(link->state == LINK_STATE_PENDING);
2302
2303 link_set_state(link, LINK_STATE_ENSLAVING);
2304
2305 link_dirty(link);
2306
2307 if (!link->network->bridge &&
2308 !link->network->bond &&
2309 !link->network->vrf &&
2310 hashmap_isempty(link->network->stacked_netdevs))
2311 return link_joined(link);
2312
2313 if (link->network->bond) {
2314 if (link->network->bond->state == NETDEV_STATE_READY &&
2315 link->network->bond->ifindex == link->master_ifindex)
2316 return link_joined(link);
2317
2318 log_struct(LOG_DEBUG,
2319 LOG_LINK_INTERFACE(link),
2320 LOG_NETDEV_INTERFACE(link->network->bond),
2321 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2322
2323 r = netdev_join(link->network->bond, link, netdev_join_handler);
2324 if (r < 0) {
2325 log_struct_errno(LOG_WARNING, r,
2326 LOG_LINK_INTERFACE(link),
2327 LOG_NETDEV_INTERFACE(link->network->bond),
2328 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2329 link_enter_failed(link);
2330 return r;
2331 }
2332
2333 link->enslaving++;
2334 }
2335
2336 if (link->network->bridge) {
2337 log_struct(LOG_DEBUG,
2338 LOG_LINK_INTERFACE(link),
2339 LOG_NETDEV_INTERFACE(link->network->bridge),
2340 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2341
2342 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2343 if (r < 0) {
2344 log_struct_errno(LOG_WARNING, r,
2345 LOG_LINK_INTERFACE(link),
2346 LOG_NETDEV_INTERFACE(link->network->bridge),
2347 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2348 link_enter_failed(link);
2349 return r;
2350 }
2351
2352 link->enslaving++;
2353 }
2354
2355 if (link->network->vrf) {
2356 log_struct(LOG_DEBUG,
2357 LOG_LINK_INTERFACE(link),
2358 LOG_NETDEV_INTERFACE(link->network->vrf),
2359 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2360
2361 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2362 if (r < 0) {
2363 log_struct_errno(LOG_WARNING, r,
2364 LOG_LINK_INTERFACE(link),
2365 LOG_NETDEV_INTERFACE(link->network->vrf),
2366 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2367 link_enter_failed(link);
2368 return r;
2369 }
2370
2371 link->enslaving++;
2372 }
2373
2374 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2375
2376 if (netdev->ifindex > 0) {
2377 link_joined(link);
2378 continue;
2379 }
2380
2381 log_struct(LOG_DEBUG,
2382 LOG_LINK_INTERFACE(link),
2383 LOG_NETDEV_INTERFACE(netdev),
2384 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2385
2386 r = netdev_join(netdev, link, netdev_join_handler);
2387 if (r < 0) {
2388 log_struct_errno(LOG_WARNING, r,
2389 LOG_LINK_INTERFACE(link),
2390 LOG_NETDEV_INTERFACE(netdev),
2391 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2392 link_enter_failed(link);
2393 return r;
2394 }
2395
2396 link->enslaving++;
2397 }
2398
2399 return 0;
2400 }
2401
2402 static int link_set_ipv4_forward(Link *link) {
2403 int r;
2404
2405 if (!link_ipv4_forward_enabled(link))
2406 return 0;
2407
2408 /* We propagate the forwarding flag from one interface to the
2409 * global setting one way. This means: as long as at least one
2410 * interface was configured at any time that had IP forwarding
2411 * enabled the setting will stay on for good. We do this
2412 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2413 * somewhat in sync (see below). */
2414
2415 r = write_string_file("/proc/sys/net/ipv4/ip_forward", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2416 if (r < 0)
2417 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2418
2419 return 0;
2420 }
2421
2422 static int link_set_ipv6_forward(Link *link) {
2423 int r;
2424
2425 if (!link_ipv6_forward_enabled(link))
2426 return 0;
2427
2428 /* On Linux, the IPv6 stack does not know a per-interface
2429 * packet forwarding setting: either packet forwarding is on
2430 * for all, or off for all. We hence don't bother with a
2431 * per-interface setting, but simply propagate the interface
2432 * flag, if it is set, to the global flag, one-way. Note that
2433 * while IPv4 would allow a per-interface flag, we expose the
2434 * same behaviour there and also propagate the setting from
2435 * one to all, to keep things simple (see above). */
2436
2437 r = write_string_file("/proc/sys/net/ipv6/conf/all/forwarding", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2438 if (r < 0)
2439 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2440
2441 return 0;
2442 }
2443
2444 static int link_set_ipv6_privacy_extensions(Link *link) {
2445 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2446 IPv6PrivacyExtensions s;
2447 const char *p = NULL;
2448 int r;
2449
2450 s = link_ipv6_privacy_extensions(link);
2451 if (s < 0)
2452 return 0;
2453
2454 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/use_tempaddr");
2455 xsprintf(buf, "%u", (unsigned) link->network->ipv6_privacy_extensions);
2456
2457 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2458 if (r < 0)
2459 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2460
2461 return 0;
2462 }
2463
2464 static int link_set_ipv6_accept_ra(Link *link) {
2465 const char *p = NULL;
2466 int r;
2467
2468 /* Make this a NOP if IPv6 is not available */
2469 if (!socket_ipv6_is_supported())
2470 return 0;
2471
2472 if (link->flags & IFF_LOOPBACK)
2473 return 0;
2474
2475 if (!link->network)
2476 return 0;
2477
2478 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/accept_ra");
2479
2480 /* We handle router advertisements ourselves, tell the kernel to GTFO */
2481 r = write_string_file(p, "0", WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2482 if (r < 0)
2483 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2484
2485 return 0;
2486 }
2487
2488 static int link_set_ipv6_dad_transmits(Link *link) {
2489 char buf[DECIMAL_STR_MAX(int) + 1];
2490 const char *p = NULL;
2491 int r;
2492
2493 /* Make this a NOP if IPv6 is not available */
2494 if (!socket_ipv6_is_supported())
2495 return 0;
2496
2497 if (link->flags & IFF_LOOPBACK)
2498 return 0;
2499
2500 if (!link->network)
2501 return 0;
2502
2503 if (link->network->ipv6_dad_transmits < 0)
2504 return 0;
2505
2506 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/dad_transmits");
2507 xsprintf(buf, "%i", link->network->ipv6_dad_transmits);
2508
2509 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2510 if (r < 0)
2511 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2512
2513 return 0;
2514 }
2515
2516 static int link_set_ipv6_hop_limit(Link *link) {
2517 char buf[DECIMAL_STR_MAX(int) + 1];
2518 const char *p = NULL;
2519 int r;
2520
2521 /* Make this a NOP if IPv6 is not available */
2522 if (!socket_ipv6_is_supported())
2523 return 0;
2524
2525 if (link->flags & IFF_LOOPBACK)
2526 return 0;
2527
2528 if (!link->network)
2529 return 0;
2530
2531 if (link->network->ipv6_hop_limit < 0)
2532 return 0;
2533
2534 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/hop_limit");
2535 xsprintf(buf, "%i", link->network->ipv6_hop_limit);
2536
2537 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2538 if (r < 0)
2539 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2540
2541 return 0;
2542 }
2543
2544 static int link_set_ipv6_mtu(Link *link) {
2545 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2546 const char *p = NULL;
2547 int r;
2548
2549 /* Make this a NOP if IPv6 is not available */
2550 if (!socket_ipv6_is_supported())
2551 return 0;
2552
2553 if (link->flags & IFF_LOOPBACK)
2554 return 0;
2555
2556 if (link->network->ipv6_mtu == 0)
2557 return 0;
2558
2559 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/mtu");
2560
2561 xsprintf(buf, "%" PRIu32, link->network->ipv6_mtu);
2562
2563 r = write_string_file(p, buf, WRITE_STRING_FILE_DISABLE_BUFFER);
2564 if (r < 0)
2565 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2566
2567 return 0;
2568 }
2569
2570 static bool link_is_static_address_configured(Link *link, Address *address) {
2571 Address *net_address;
2572
2573 assert(link);
2574 assert(address);
2575
2576 if (!link->network)
2577 return false;
2578
2579 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2580 if (address_equal(net_address, address))
2581 return true;
2582
2583 return false;
2584 }
2585
2586 static bool link_is_static_route_configured(Link *link, Route *route) {
2587 Route *net_route;
2588
2589 assert(link);
2590 assert(route);
2591
2592 if (!link->network)
2593 return false;
2594
2595 LIST_FOREACH(routes, net_route, link->network->static_routes)
2596 if (route_equal(net_route, route))
2597 return true;
2598
2599 return false;
2600 }
2601
2602 static int link_drop_foreign_config(Link *link) {
2603 Address *address;
2604 Route *route;
2605 Iterator i;
2606 int r;
2607
2608 SET_FOREACH(address, link->addresses_foreign, i) {
2609 /* we consider IPv6LL addresses to be managed by the kernel */
2610 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2611 continue;
2612
2613 if (link_is_static_address_configured(link, address)) {
2614 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2615 if (r < 0)
2616 return log_link_error_errno(link, r, "Failed to add address: %m");
2617 } else {
2618 r = address_remove(address, link, NULL);
2619 if (r < 0)
2620 return r;
2621 }
2622 }
2623
2624 SET_FOREACH(route, link->routes_foreign, i) {
2625 /* do not touch routes managed by the kernel */
2626 if (route->protocol == RTPROT_KERNEL)
2627 continue;
2628
2629 if (link_is_static_route_configured(link, route)) {
2630 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2631 if (r < 0)
2632 return r;
2633 } else {
2634 r = route_remove(route, link, NULL);
2635 if (r < 0)
2636 return r;
2637 }
2638 }
2639
2640 return 0;
2641 }
2642
2643 static int link_drop_config(Link *link) {
2644 Address *address, *pool_address;
2645 Route *route;
2646 Iterator i;
2647 int r;
2648
2649 SET_FOREACH(address, link->addresses, i) {
2650 /* we consider IPv6LL addresses to be managed by the kernel */
2651 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2652 continue;
2653
2654 r = address_remove(address, link, NULL);
2655 if (r < 0)
2656 return r;
2657
2658 /* If this address came from an address pool, clean up the pool */
2659 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2660 if (address_equal(address, pool_address)) {
2661 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2662 address_free(pool_address);
2663 break;
2664 }
2665 }
2666 }
2667
2668 SET_FOREACH(route, link->routes, i) {
2669 /* do not touch routes managed by the kernel */
2670 if (route->protocol == RTPROT_KERNEL)
2671 continue;
2672
2673 r = route_remove(route, link, NULL);
2674 if (r < 0)
2675 return r;
2676 }
2677
2678 ndisc_flush(link);
2679
2680 return 0;
2681 }
2682
2683 static int link_update_lldp(Link *link) {
2684 int r;
2685
2686 assert(link);
2687
2688 if (!link->lldp)
2689 return 0;
2690
2691 if (link->flags & IFF_UP) {
2692 r = sd_lldp_start(link->lldp);
2693 if (r > 0)
2694 log_link_debug(link, "Started LLDP.");
2695 } else {
2696 r = sd_lldp_stop(link->lldp);
2697 if (r > 0)
2698 log_link_debug(link, "Stopped LLDP.");
2699 }
2700
2701 return r;
2702 }
2703
2704 static int link_configure_can(Link *link) {
2705 int r;
2706
2707 if (streq_ptr(link->kind, "can")) {
2708 /* The CAN interface must be down to configure bitrate, etc... */
2709 if ((link->flags & IFF_UP)) {
2710 r = link_down(link);
2711 if (r < 0) {
2712 link_enter_failed(link);
2713 return r;
2714 }
2715
2716 return 0;
2717 }
2718
2719 return link_set_can(link);
2720 }
2721
2722 if (!(link->flags & IFF_UP)) {
2723 r = link_up_can(link);
2724 if (r < 0) {
2725 link_enter_failed(link);
2726 return r;
2727 }
2728 }
2729
2730 return 0;
2731 }
2732
2733 static int link_configure(Link *link) {
2734 int r;
2735
2736 assert(link);
2737 assert(link->network);
2738 assert(link->state == LINK_STATE_PENDING);
2739
2740 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
2741 return link_configure_can(link);
2742
2743 /* Drop foreign config, but ignore loopback or critical devices.
2744 * We do not want to remove loopback address or addresses used for root NFS. */
2745 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2746 r = link_drop_foreign_config(link);
2747 if (r < 0)
2748 return r;
2749 }
2750
2751 r = link_set_proxy_arp(link);
2752 if (r < 0)
2753 return r;
2754
2755 r = ipv6_proxy_ndp_addresses_configure(link);
2756 if (r < 0)
2757 return r;
2758
2759 r = link_set_ipv4_forward(link);
2760 if (r < 0)
2761 return r;
2762
2763 r = link_set_ipv6_forward(link);
2764 if (r < 0)
2765 return r;
2766
2767 r = link_set_ipv6_privacy_extensions(link);
2768 if (r < 0)
2769 return r;
2770
2771 r = link_set_ipv6_accept_ra(link);
2772 if (r < 0)
2773 return r;
2774
2775 r = link_set_ipv6_dad_transmits(link);
2776 if (r < 0)
2777 return r;
2778
2779 r = link_set_ipv6_hop_limit(link);
2780 if (r < 0)
2781 return r;
2782
2783 r = link_set_flags(link);
2784 if (r < 0)
2785 return r;
2786
2787 r = link_set_ipv6_mtu(link);
2788 if (r < 0)
2789 return r;
2790
2791 if (link_ipv4ll_enabled(link)) {
2792 r = ipv4ll_configure(link);
2793 if (r < 0)
2794 return r;
2795 }
2796
2797 if (link_dhcp4_enabled(link)) {
2798 r = dhcp4_set_promote_secondaries(link);
2799 if (r < 0)
2800 return r;
2801
2802 r = dhcp4_configure(link);
2803 if (r < 0)
2804 return r;
2805 }
2806
2807 if (link_dhcp4_server_enabled(link)) {
2808 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2809 if (r < 0)
2810 return r;
2811
2812 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2813 if (r < 0)
2814 return r;
2815 }
2816
2817 if (link_dhcp6_enabled(link) ||
2818 link_ipv6_accept_ra_enabled(link)) {
2819 r = dhcp6_configure(link);
2820 if (r < 0)
2821 return r;
2822 }
2823
2824 if (link_ipv6_accept_ra_enabled(link)) {
2825 r = ndisc_configure(link);
2826 if (r < 0)
2827 return r;
2828 }
2829
2830 if (link_radv_enabled(link)) {
2831 r = radv_configure(link);
2832 if (r < 0)
2833 return r;
2834 }
2835
2836 if (link_lldp_rx_enabled(link)) {
2837 r = sd_lldp_new(&link->lldp);
2838 if (r < 0)
2839 return r;
2840
2841 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
2842 if (r < 0)
2843 return r;
2844
2845 r = sd_lldp_match_capabilities(link->lldp,
2846 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
2847 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
2848 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
2849 if (r < 0)
2850 return r;
2851
2852 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
2853 if (r < 0)
2854 return r;
2855
2856 r = sd_lldp_attach_event(link->lldp, NULL, 0);
2857 if (r < 0)
2858 return r;
2859
2860 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
2861 if (r < 0)
2862 return r;
2863
2864 r = link_update_lldp(link);
2865 if (r < 0)
2866 return r;
2867 }
2868
2869 if (link->network->mtu > 0) {
2870 r = link_set_mtu(link, link->network->mtu);
2871 if (r < 0)
2872 return r;
2873 }
2874
2875 return link_configure_after_setting_mtu(link);
2876 }
2877
2878 static int link_configure_after_setting_mtu(Link *link) {
2879 int r;
2880
2881 assert(link);
2882 assert(link->network);
2883 assert(link->state == LINK_STATE_PENDING);
2884
2885 if (link->setting_mtu)
2886 return 0;
2887
2888 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2889 r = link_acquire_conf(link);
2890 if (r < 0)
2891 return r;
2892 }
2893
2894 return link_enter_join_netdev(link);
2895 }
2896
2897 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
2898 assert(duid);
2899
2900 if (duid->raw_data_len > 0)
2901 return 0;
2902
2903 if (duid->type != DUID_TYPE_UUID)
2904 return -EINVAL;
2905
2906 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
2907 duid->raw_data_len = sizeof(sd_id128_t);
2908
2909 return 1;
2910 }
2911
2912 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
2913 Manager *manager = userdata;
2914 const sd_bus_error *e;
2915 const void *a;
2916 size_t sz;
2917 DUID *duid;
2918 Link *link;
2919 int r;
2920
2921 assert(m);
2922 assert(manager);
2923
2924 e = sd_bus_message_get_error(m);
2925 if (e) {
2926 log_error_errno(sd_bus_error_get_errno(e),
2927 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
2928 e->message);
2929 goto configure;
2930 }
2931
2932 r = sd_bus_message_read_array(m, 'y', &a, &sz);
2933 if (r < 0)
2934 goto configure;
2935
2936 if (sz != sizeof(sd_id128_t)) {
2937 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
2938 goto configure;
2939 }
2940
2941 memcpy(&manager->product_uuid, a, sz);
2942 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
2943 (void) duid_set_uuid(duid, manager->product_uuid);
2944
2945 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
2946
2947 configure:
2948 while ((link = set_steal_first(manager->links_requesting_uuid))) {
2949 r = link_configure(link);
2950 if (r < 0)
2951 log_link_error_errno(link, r, "Failed to configure link: %m");
2952 }
2953
2954 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
2955
2956 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
2957 * even if the method fails. */
2958 manager->has_product_uuid = true;
2959
2960 return 1;
2961 }
2962
2963 static bool link_requires_uuid(Link *link) {
2964 const DUID *duid;
2965
2966 assert(link);
2967 assert(link->manager);
2968 assert(link->network);
2969
2970 duid = link_get_duid(link);
2971 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
2972 return false;
2973
2974 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
2975 return true;
2976
2977 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
2978 return true;
2979
2980 return false;
2981 }
2982
2983 static int link_configure_duid(Link *link) {
2984 Manager *m;
2985 DUID *duid;
2986 int r;
2987
2988 assert(link);
2989 assert(link->manager);
2990 assert(link->network);
2991
2992 m = link->manager;
2993 duid = link_get_duid(link);
2994
2995 if (!link_requires_uuid(link))
2996 return 1;
2997
2998 if (m->has_product_uuid) {
2999 (void) duid_set_uuid(duid, m->product_uuid);
3000 return 1;
3001 }
3002
3003 if (!m->links_requesting_uuid) {
3004 r = manager_request_product_uuid(m, link);
3005 if (r < 0) {
3006 if (r == -ENOMEM)
3007 return r;
3008
3009 log_link_warning_errno(link, r,
3010 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3011 return 1;
3012 }
3013 } else {
3014 r = set_put(m->links_requesting_uuid, link);
3015 if (r < 0)
3016 return log_oom();
3017
3018 r = set_put(m->duids_requesting_uuid, duid);
3019 if (r < 0)
3020 return log_oom();
3021 }
3022
3023 return 0;
3024 }
3025
3026 static int link_initialized_and_synced(Link *link) {
3027 Network *network;
3028 int r;
3029
3030 assert(link);
3031 assert(link->ifname);
3032 assert(link->manager);
3033
3034 if (link->state != LINK_STATE_PENDING)
3035 return 1;
3036
3037 log_link_debug(link, "Link state is up-to-date");
3038
3039 r = link_new_bound_by_list(link);
3040 if (r < 0)
3041 return r;
3042
3043 r = link_handle_bound_by_list(link);
3044 if (r < 0)
3045 return r;
3046
3047 if (!link->network) {
3048 r = network_get(link->manager, link->sd_device, link->ifname,
3049 &link->mac, &network);
3050 if (r == -ENOENT) {
3051 link_enter_unmanaged(link);
3052 return 1;
3053 } else if (r == 0 && network->unmanaged) {
3054 link_enter_unmanaged(link);
3055 return 0;
3056 } else if (r < 0)
3057 return r;
3058
3059 if (link->flags & IFF_LOOPBACK) {
3060 if (network->link_local != ADDRESS_FAMILY_NO)
3061 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3062
3063 if (network->dhcp != ADDRESS_FAMILY_NO)
3064 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3065
3066 if (network->dhcp_server)
3067 log_link_debug(link, "Ignoring DHCP server for loopback link");
3068 }
3069
3070 r = network_apply(network, link);
3071 if (r < 0)
3072 return r;
3073 }
3074
3075 r = link_new_bound_to_list(link);
3076 if (r < 0)
3077 return r;
3078
3079 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3080 * link_configure() is called later asynchronously. */
3081 r = link_configure_duid(link);
3082 if (r <= 0)
3083 return r;
3084
3085 r = link_configure(link);
3086 if (r < 0)
3087 return r;
3088
3089 return 1;
3090 }
3091
3092 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3093 (void) link_initialized_and_synced(link);
3094 return 1;
3095 }
3096
3097 int link_initialized(Link *link, sd_device *device) {
3098 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3099 int r;
3100
3101 assert(link);
3102 assert(link->manager);
3103 assert(link->manager->rtnl);
3104 assert(device);
3105
3106 if (link->state != LINK_STATE_PENDING)
3107 return 0;
3108
3109 if (link->sd_device)
3110 return 0;
3111
3112 log_link_debug(link, "udev initialized link");
3113
3114 link->sd_device = sd_device_ref(device);
3115
3116 /* udev has initialized the link, but we don't know if we have yet
3117 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3118 * when it returns we know that the pending NEWLINKs have already been
3119 * processed and that we are up-to-date */
3120
3121 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3122 link->ifindex);
3123 if (r < 0)
3124 return r;
3125
3126 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3127 link_netlink_destroy_callback, link);
3128 if (r < 0)
3129 return r;
3130
3131 link_ref(link);
3132
3133 return 0;
3134 }
3135
3136 static int link_load(Link *link) {
3137 _cleanup_free_ char *network_file = NULL,
3138 *addresses = NULL,
3139 *routes = NULL,
3140 *dhcp4_address = NULL,
3141 *ipv4ll_address = NULL;
3142 union in_addr_union address;
3143 union in_addr_union route_dst;
3144 const char *p;
3145 int r;
3146
3147 assert(link);
3148
3149 r = parse_env_file(NULL, link->state_file,
3150 "NETWORK_FILE", &network_file,
3151 "ADDRESSES", &addresses,
3152 "ROUTES", &routes,
3153 "DHCP4_ADDRESS", &dhcp4_address,
3154 "IPV4LL_ADDRESS", &ipv4ll_address);
3155 if (r < 0 && r != -ENOENT)
3156 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3157
3158 if (network_file) {
3159 Network *network;
3160 char *suffix;
3161
3162 /* drop suffix */
3163 suffix = strrchr(network_file, '.');
3164 if (!suffix) {
3165 log_link_debug(link, "Failed to get network name from %s", network_file);
3166 goto network_file_fail;
3167 }
3168 *suffix = '\0';
3169
3170 r = network_get_by_name(link->manager, basename(network_file), &network);
3171 if (r < 0) {
3172 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3173 goto network_file_fail;
3174 }
3175
3176 r = network_apply(network, link);
3177 if (r < 0)
3178 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3179 }
3180
3181 network_file_fail:
3182
3183 if (addresses) {
3184 p = addresses;
3185
3186 for (;;) {
3187 _cleanup_free_ char *address_str = NULL;
3188 char *prefixlen_str;
3189 int family;
3190 unsigned char prefixlen;
3191
3192 r = extract_first_word(&p, &address_str, NULL, 0);
3193 if (r < 0) {
3194 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3195 continue;
3196 }
3197 if (r == 0)
3198 break;
3199
3200 prefixlen_str = strchr(address_str, '/');
3201 if (!prefixlen_str) {
3202 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3203 continue;
3204 }
3205
3206 *prefixlen_str++ = '\0';
3207
3208 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3209 if (r != 1) {
3210 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3211 continue;
3212 }
3213
3214 r = in_addr_from_string_auto(address_str, &family, &address);
3215 if (r < 0) {
3216 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3217 continue;
3218 }
3219
3220 r = address_add(link, family, &address, prefixlen, NULL);
3221 if (r < 0)
3222 return log_link_error_errno(link, r, "Failed to add address: %m");
3223 }
3224 }
3225
3226 if (routes) {
3227 p = routes;
3228
3229 for (;;) {
3230 Route *route;
3231 _cleanup_free_ char *route_str = NULL;
3232 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3233 usec_t lifetime;
3234 char *prefixlen_str;
3235 int family;
3236 unsigned char prefixlen, tos, table;
3237 uint32_t priority;
3238
3239 r = extract_first_word(&p, &route_str, NULL, 0);
3240 if (r < 0) {
3241 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3242 continue;
3243 }
3244 if (r == 0)
3245 break;
3246
3247 prefixlen_str = strchr(route_str, '/');
3248 if (!prefixlen_str) {
3249 log_link_debug(link, "Failed to parse route %s", route_str);
3250 continue;
3251 }
3252
3253 *prefixlen_str++ = '\0';
3254
3255 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3256 if (r != 5) {
3257 log_link_debug(link,
3258 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3259 prefixlen_str);
3260 continue;
3261 }
3262
3263 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3264 if (r < 0) {
3265 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3266 continue;
3267 }
3268
3269 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3270 if (r < 0)
3271 return log_link_error_errno(link, r, "Failed to add route: %m");
3272
3273 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3274 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3275 0, route_expire_handler, route);
3276 if (r < 0)
3277 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3278 }
3279
3280 route->lifetime = lifetime;
3281 sd_event_source_unref(route->expire);
3282 route->expire = TAKE_PTR(expire);
3283 }
3284 }
3285
3286 if (dhcp4_address) {
3287 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3288 if (r < 0) {
3289 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3290 goto dhcp4_address_fail;
3291 }
3292
3293 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3294 if (r < 0)
3295 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3296
3297 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3298 if (r < 0)
3299 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3300 }
3301
3302 dhcp4_address_fail:
3303
3304 if (ipv4ll_address) {
3305 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3306 if (r < 0) {
3307 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3308 goto ipv4ll_address_fail;
3309 }
3310
3311 r = sd_ipv4ll_new(&link->ipv4ll);
3312 if (r < 0)
3313 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3314
3315 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3316 if (r < 0)
3317 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3318 }
3319
3320 ipv4ll_address_fail:
3321
3322 return 0;
3323 }
3324
3325 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3326 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3327 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3328 Link *link;
3329 int r;
3330
3331 assert(m);
3332 assert(m->rtnl);
3333 assert(message);
3334 assert(ret);
3335
3336 r = link_new(m, message, ret);
3337 if (r < 0)
3338 return r;
3339
3340 link = *ret;
3341
3342 log_link_debug(link, "Link %d added", link->ifindex);
3343
3344 r = link_load(link);
3345 if (r < 0)
3346 return r;
3347
3348 if (detect_container() <= 0) {
3349 /* not in a container, udev will be around */
3350 sprintf(ifindex_str, "n%d", link->ifindex);
3351 r = sd_device_new_from_device_id(&device, ifindex_str);
3352 if (r < 0) {
3353 log_link_warning_errno(link, r, "Could not find device: %m");
3354 goto failed;
3355 }
3356
3357 r = sd_device_get_is_initialized(device);
3358 if (r < 0) {
3359 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3360 goto failed;
3361 }
3362 if (r == 0) {
3363 /* not yet ready */
3364 log_link_debug(link, "link pending udev initialization...");
3365 return 0;
3366 }
3367
3368 r = link_initialized(link, device);
3369 if (r < 0)
3370 goto failed;
3371 } else {
3372 r = link_initialized_and_synced(link);
3373 if (r < 0)
3374 goto failed;
3375 }
3376
3377 return 0;
3378 failed:
3379 link_enter_failed(link);
3380 return r;
3381 }
3382
3383 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3384 int r;
3385
3386 assert(link);
3387
3388 log_link_info(link, "Gained IPv6LL");
3389
3390 link->ipv6ll_address = *address;
3391 link_check_ready(link);
3392
3393 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3394 r = link_acquire_ipv6_conf(link);
3395 if (r < 0) {
3396 link_enter_failed(link);
3397 return r;
3398 }
3399 }
3400
3401 return 0;
3402 }
3403
3404 static int link_carrier_gained(Link *link) {
3405 int r;
3406
3407 assert(link);
3408
3409 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3410 r = link_acquire_conf(link);
3411 if (r < 0) {
3412 link_enter_failed(link);
3413 return r;
3414 }
3415
3416 r = link_enter_set_addresses(link);
3417 if (r < 0)
3418 return r;
3419 }
3420
3421 r = link_handle_bound_by_list(link);
3422 if (r < 0)
3423 return r;
3424
3425 return 0;
3426 }
3427
3428 static int link_carrier_lost(Link *link) {
3429 int r;
3430
3431 assert(link);
3432
3433 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3434 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3435 * configuration and stop the clients as well. */
3436 if (link->setting_mtu)
3437 return 0;
3438
3439 r = link_stop_clients(link);
3440 if (r < 0) {
3441 link_enter_failed(link);
3442 return r;
3443 }
3444
3445 if (link_dhcp4_server_enabled(link))
3446 (void) sd_dhcp_server_stop(link->dhcp_server);
3447
3448 r = link_drop_config(link);
3449 if (r < 0)
3450 return r;
3451
3452 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3453 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3454 r = link_drop_foreign_config(link);
3455 if (r < 0)
3456 return r;
3457 }
3458
3459 r = link_handle_bound_by_list(link);
3460 if (r < 0)
3461 return r;
3462
3463 return 0;
3464 }
3465
3466 int link_carrier_reset(Link *link) {
3467 int r;
3468
3469 assert(link);
3470
3471 if (link_has_carrier(link)) {
3472 r = link_carrier_lost(link);
3473 if (r < 0)
3474 return r;
3475
3476 r = link_carrier_gained(link);
3477 if (r < 0)
3478 return r;
3479
3480 log_link_info(link, "Reset carrier");
3481 }
3482
3483 return 0;
3484 }
3485
3486 int link_update(Link *link, sd_netlink_message *m) {
3487 struct ether_addr mac;
3488 const char *ifname;
3489 uint32_t mtu;
3490 bool had_carrier, carrier_gained, carrier_lost;
3491 int r;
3492
3493 assert(link);
3494 assert(link->ifname);
3495 assert(m);
3496
3497 if (link->state == LINK_STATE_LINGER) {
3498 log_link_info(link, "Link readded");
3499 link_set_state(link, LINK_STATE_ENSLAVING);
3500
3501 r = link_new_carrier_maps(link);
3502 if (r < 0)
3503 return r;
3504 }
3505
3506 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3507 if (r >= 0 && !streq(ifname, link->ifname)) {
3508 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3509
3510 if (link->state == LINK_STATE_PENDING) {
3511 r = free_and_strdup(&link->ifname, ifname);
3512 if (r < 0)
3513 return r;
3514 } else {
3515 Manager *manager = link->manager;
3516
3517 link_drop(link);
3518 r = link_add(manager, m, &link);
3519 if (r < 0)
3520 return r;
3521 }
3522 }
3523
3524 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3525 if (r >= 0 && mtu > 0) {
3526 link->mtu = mtu;
3527 if (link->original_mtu == 0) {
3528 link->original_mtu = mtu;
3529 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3530 }
3531
3532 if (link->dhcp_client) {
3533 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3534 link->mtu);
3535 if (r < 0)
3536 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3537 }
3538
3539 if (link->radv) {
3540 r = sd_radv_set_mtu(link->radv, link->mtu);
3541 if (r < 0)
3542 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3543 }
3544 }
3545
3546 /* The kernel may broadcast NEWLINK messages without the MAC address
3547 set, simply ignore them. */
3548 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3549 if (r >= 0) {
3550 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3551 ETH_ALEN)) {
3552
3553 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3554 ETH_ALEN);
3555
3556 log_link_debug(link, "MAC address: "
3557 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3558 mac.ether_addr_octet[0],
3559 mac.ether_addr_octet[1],
3560 mac.ether_addr_octet[2],
3561 mac.ether_addr_octet[3],
3562 mac.ether_addr_octet[4],
3563 mac.ether_addr_octet[5]);
3564
3565 if (link->ipv4ll) {
3566 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3567 if (r < 0)
3568 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3569 }
3570
3571 if (link->dhcp_client) {
3572 r = sd_dhcp_client_set_mac(link->dhcp_client,
3573 (const uint8_t *) &link->mac,
3574 sizeof (link->mac),
3575 ARPHRD_ETHER);
3576 if (r < 0)
3577 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3578
3579 r = dhcp4_set_client_identifier(link);
3580 if (r < 0)
3581 return r;
3582 }
3583
3584 if (link->dhcp6_client) {
3585 const DUID* duid = link_get_duid(link);
3586
3587 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3588 (const uint8_t *) &link->mac,
3589 sizeof (link->mac),
3590 ARPHRD_ETHER);
3591 if (r < 0)
3592 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3593
3594 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3595 link->network->iaid);
3596 if (r < 0)
3597 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3598
3599 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3600 duid->type,
3601 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3602 duid->raw_data_len);
3603 if (r < 0)
3604 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3605 }
3606
3607 if (link->radv) {
3608 r = sd_radv_set_mac(link->radv, &link->mac);
3609 if (r < 0)
3610 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3611 }
3612
3613 if (link->ndisc) {
3614 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3615 if (r < 0)
3616 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3617 }
3618 }
3619 }
3620
3621 had_carrier = link_has_carrier(link);
3622
3623 r = link_update_flags(link, m);
3624 if (r < 0)
3625 return r;
3626
3627 r = link_update_lldp(link);
3628 if (r < 0)
3629 return r;
3630
3631 carrier_gained = !had_carrier && link_has_carrier(link);
3632 carrier_lost = had_carrier && !link_has_carrier(link);
3633
3634 if (carrier_gained) {
3635 log_link_info(link, "Gained carrier");
3636
3637 r = link_carrier_gained(link);
3638 if (r < 0)
3639 return r;
3640 } else if (carrier_lost) {
3641 log_link_info(link, "Lost carrier");
3642
3643 r = link_carrier_lost(link);
3644 if (r < 0)
3645 return r;
3646 }
3647
3648 return 0;
3649 }
3650
3651 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3652 bool space = false;
3653 Iterator i;
3654 Link *link;
3655
3656 assert(f);
3657 assert(prefix);
3658
3659 if (hashmap_isempty(h))
3660 return;
3661
3662 fputs(prefix, f);
3663 HASHMAP_FOREACH(link, h, i) {
3664 if (space)
3665 fputc(' ', f);
3666
3667 fprintf(f, "%i", link->ifindex);
3668 space = true;
3669 }
3670
3671 fputc('\n', f);
3672 }
3673
3674 int link_save(Link *link) {
3675 _cleanup_free_ char *temp_path = NULL;
3676 _cleanup_fclose_ FILE *f = NULL;
3677 const char *admin_state, *oper_state;
3678 Address *a;
3679 Route *route;
3680 Iterator i;
3681 int r;
3682
3683 assert(link);
3684 assert(link->state_file);
3685 assert(link->lease_file);
3686 assert(link->manager);
3687
3688 if (link->state == LINK_STATE_LINGER) {
3689 unlink(link->state_file);
3690 return 0;
3691 }
3692
3693 link_lldp_save(link);
3694
3695 admin_state = link_state_to_string(link->state);
3696 assert(admin_state);
3697
3698 oper_state = link_operstate_to_string(link->operstate);
3699 assert(oper_state);
3700
3701 r = fopen_temporary(link->state_file, &f, &temp_path);
3702 if (r < 0)
3703 goto fail;
3704
3705 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
3706 (void) fchmod(fileno(f), 0644);
3707
3708 fprintf(f,
3709 "# This is private data. Do not parse.\n"
3710 "ADMIN_STATE=%s\n"
3711 "OPER_STATE=%s\n",
3712 admin_state, oper_state);
3713
3714 if (link->network) {
3715 bool space;
3716 sd_dhcp6_lease *dhcp6_lease = NULL;
3717 const char *dhcp_domainname = NULL;
3718 char **dhcp6_domains = NULL;
3719 char **dhcp_domains = NULL;
3720 unsigned j;
3721
3722 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3723 yes_no(link->network->required_for_online));
3724
3725 if (link->dhcp6_client) {
3726 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3727 if (r < 0 && r != -ENOMSG)
3728 log_link_debug(link, "No DHCPv6 lease");
3729 }
3730
3731 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3732
3733 fputs("DNS=", f);
3734 space = false;
3735
3736 for (j = 0; j < link->network->n_dns; j++) {
3737 _cleanup_free_ char *b = NULL;
3738
3739 r = in_addr_to_string(link->network->dns[j].family,
3740 &link->network->dns[j].address, &b);
3741 if (r < 0) {
3742 log_debug_errno(r, "Failed to format address, ignoring: %m");
3743 continue;
3744 }
3745
3746 if (space)
3747 fputc(' ', f);
3748 fputs(b, f);
3749 space = true;
3750 }
3751
3752 if (link->network->dhcp_use_dns &&
3753 link->dhcp_lease) {
3754 const struct in_addr *addresses;
3755
3756 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3757 if (r > 0) {
3758 if (space)
3759 fputc(' ', f);
3760 serialize_in_addrs(f, addresses, r);
3761 space = true;
3762 }
3763 }
3764
3765 if (link->network->dhcp_use_dns && dhcp6_lease) {
3766 struct in6_addr *in6_addrs;
3767
3768 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3769 if (r > 0) {
3770 if (space)
3771 fputc(' ', f);
3772 serialize_in6_addrs(f, in6_addrs, r);
3773 space = true;
3774 }
3775 }
3776
3777 /* Make sure to flush out old entries before we use the NDISC data */
3778 ndisc_vacuum(link);
3779
3780 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3781 NDiscRDNSS *dd;
3782
3783 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3784 if (space)
3785 fputc(' ', f);
3786
3787 serialize_in6_addrs(f, &dd->address, 1);
3788 space = true;
3789 }
3790 }
3791
3792 fputc('\n', f);
3793
3794 fputs("NTP=", f);
3795 space = false;
3796 fputstrv(f, link->network->ntp, NULL, &space);
3797
3798 if (link->network->dhcp_use_ntp &&
3799 link->dhcp_lease) {
3800 const struct in_addr *addresses;
3801
3802 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3803 if (r > 0) {
3804 if (space)
3805 fputc(' ', f);
3806 serialize_in_addrs(f, addresses, r);
3807 space = true;
3808 }
3809 }
3810
3811 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3812 struct in6_addr *in6_addrs;
3813 char **hosts;
3814
3815 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3816 &in6_addrs);
3817 if (r > 0) {
3818 if (space)
3819 fputc(' ', f);
3820 serialize_in6_addrs(f, in6_addrs, r);
3821 space = true;
3822 }
3823
3824 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3825 if (r > 0)
3826 fputstrv(f, hosts, NULL, &space);
3827 }
3828
3829 fputc('\n', f);
3830
3831 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3832 if (link->dhcp_lease) {
3833 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3834 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3835 }
3836 if (dhcp6_lease)
3837 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3838 }
3839
3840 fputs("DOMAINS=", f);
3841 space = false;
3842 fputstrv(f, link->network->search_domains, NULL, &space);
3843
3844 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3845 NDiscDNSSL *dd;
3846
3847 if (dhcp_domainname)
3848 fputs_with_space(f, dhcp_domainname, NULL, &space);
3849 if (dhcp_domains)
3850 fputstrv(f, dhcp_domains, NULL, &space);
3851 if (dhcp6_domains)
3852 fputstrv(f, dhcp6_domains, NULL, &space);
3853
3854 SET_FOREACH(dd, link->ndisc_dnssl, i)
3855 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3856 }
3857
3858 fputc('\n', f);
3859
3860 fputs("ROUTE_DOMAINS=", f);
3861 space = false;
3862 fputstrv(f, link->network->route_domains, NULL, &space);
3863
3864 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3865 NDiscDNSSL *dd;
3866
3867 if (dhcp_domainname)
3868 fputs_with_space(f, dhcp_domainname, NULL, &space);
3869 if (dhcp_domains)
3870 fputstrv(f, dhcp_domains, NULL, &space);
3871 if (dhcp6_domains)
3872 fputstrv(f, dhcp6_domains, NULL, &space);
3873
3874 SET_FOREACH(dd, link->ndisc_dnssl, i)
3875 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3876 }
3877
3878 fputc('\n', f);
3879
3880 fprintf(f, "LLMNR=%s\n",
3881 resolve_support_to_string(link->network->llmnr));
3882 fprintf(f, "MDNS=%s\n",
3883 resolve_support_to_string(link->network->mdns));
3884
3885 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3886 fprintf(f, "DNS_OVER_TLS=%s\n",
3887 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
3888
3889 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3890 fprintf(f, "DNSSEC=%s\n",
3891 dnssec_mode_to_string(link->network->dnssec_mode));
3892
3893 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3894 const char *n;
3895
3896 fputs("DNSSEC_NTA=", f);
3897 space = false;
3898 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3899 fputs_with_space(f, n, NULL, &space);
3900 fputc('\n', f);
3901 }
3902
3903 fputs("ADDRESSES=", f);
3904 space = false;
3905 SET_FOREACH(a, link->addresses, i) {
3906 _cleanup_free_ char *address_str = NULL;
3907
3908 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3909 if (r < 0)
3910 goto fail;
3911
3912 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3913 space = true;
3914 }
3915 fputc('\n', f);
3916
3917 fputs("ROUTES=", f);
3918 space = false;
3919 SET_FOREACH(route, link->routes, i) {
3920 _cleanup_free_ char *route_str = NULL;
3921
3922 r = in_addr_to_string(route->family, &route->dst, &route_str);
3923 if (r < 0)
3924 goto fail;
3925
3926 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
3927 space ? " " : "", route_str,
3928 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3929 space = true;
3930 }
3931
3932 fputc('\n', f);
3933 }
3934
3935 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3936 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3937
3938 if (link->dhcp_lease) {
3939 struct in_addr address;
3940 const char *tz = NULL;
3941
3942 assert(link->network);
3943
3944 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3945 if (r >= 0)
3946 fprintf(f, "TIMEZONE=%s\n", tz);
3947
3948 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3949 if (r >= 0) {
3950 fputs("DHCP4_ADDRESS=", f);
3951 serialize_in_addrs(f, &address, 1);
3952 fputc('\n', f);
3953 }
3954
3955 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3956 if (r < 0)
3957 goto fail;
3958
3959 fprintf(f,
3960 "DHCP_LEASE=%s\n",
3961 link->lease_file);
3962 } else
3963 unlink(link->lease_file);
3964
3965 if (link->ipv4ll) {
3966 struct in_addr address;
3967
3968 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3969 if (r >= 0) {
3970 fputs("IPV4LL_ADDRESS=", f);
3971 serialize_in_addrs(f, &address, 1);
3972 fputc('\n', f);
3973 }
3974 }
3975
3976 r = fflush_and_check(f);
3977 if (r < 0)
3978 goto fail;
3979
3980 if (rename(temp_path, link->state_file) < 0) {
3981 r = -errno;
3982 goto fail;
3983 }
3984
3985 return 0;
3986
3987 fail:
3988 (void) unlink(link->state_file);
3989 if (temp_path)
3990 (void) unlink(temp_path);
3991
3992 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3993 }
3994
3995 /* The serialized state in /run is no longer up-to-date. */
3996 void link_dirty(Link *link) {
3997 int r;
3998
3999 assert(link);
4000
4001 /* mark manager dirty as link is dirty */
4002 manager_dirty(link->manager);
4003
4004 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
4005 if (r < 0)
4006 /* allocation errors are ignored */
4007 return;
4008
4009 r = set_put(link->manager->dirty_links, link);
4010 if (r <= 0)
4011 /* don't take another ref if the link was already dirty */
4012 return;
4013
4014 link_ref(link);
4015 }
4016
4017 /* The serialized state in /run is up-to-date */
4018 void link_clean(Link *link) {
4019 assert(link);
4020 assert(link->manager);
4021
4022 link_unref(set_remove(link->manager->dirty_links, link));
4023 }
4024
4025 static const char* const link_state_table[_LINK_STATE_MAX] = {
4026 [LINK_STATE_PENDING] = "pending",
4027 [LINK_STATE_ENSLAVING] = "configuring",
4028 [LINK_STATE_SETTING_ADDRESSES] = "configuring",
4029 [LINK_STATE_SETTING_ROUTES] = "configuring",
4030 [LINK_STATE_CONFIGURED] = "configured",
4031 [LINK_STATE_UNMANAGED] = "unmanaged",
4032 [LINK_STATE_FAILED] = "failed",
4033 [LINK_STATE_LINGER] = "linger",
4034 };
4035
4036 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
4037
4038 static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
4039 [LINK_OPERSTATE_OFF] = "off",
4040 [LINK_OPERSTATE_NO_CARRIER] = "no-carrier",
4041 [LINK_OPERSTATE_DORMANT] = "dormant",
4042 [LINK_OPERSTATE_CARRIER] = "carrier",
4043 [LINK_OPERSTATE_DEGRADED] = "degraded",
4044 [LINK_OPERSTATE_ROUTABLE] = "routable",
4045 };
4046
4047 DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
Unnamed repository; edit this file 'description' to name the repository.