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pkgconfig: define variables relative to ${prefix}/${rootprefix}/${sysconfdir}
[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 "fd-util.h"
14 #include "fileio.h"
15 #include "netlink-util.h"
16 #include "network-internal.h"
17 #include "networkd-ipv6-proxy-ndp.h"
18 #include "networkd-lldp-tx.h"
19 #include "networkd-manager.h"
20 #include "networkd-ndisc.h"
21 #include "networkd-radv.h"
22 #include "networkd-routing-policy-rule.h"
23 #include "set.h"
24 #include "socket-util.h"
25 #include "stdio-util.h"
26 #include "string-table.h"
27 #include "strv.h"
28 #include "util.h"
29 #include "virt.h"
30
31 DUID* link_get_duid(Link *link) {
32 if (link->network->duid.type != _DUID_TYPE_INVALID)
33 return &link->network->duid;
34 else
35 return &link->manager->duid;
36 }
37
38 static bool link_dhcp6_enabled(Link *link) {
39 assert(link);
40
41 if (!socket_ipv6_is_supported())
42 return false;
43
44 if (link->flags & IFF_LOOPBACK)
45 return false;
46
47 if (!link->network)
48 return false;
49
50 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
51 }
52
53 static bool link_dhcp4_enabled(Link *link) {
54 assert(link);
55
56 if (link->flags & IFF_LOOPBACK)
57 return false;
58
59 if (!link->network)
60 return false;
61
62 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
63 }
64
65 static bool link_dhcp4_server_enabled(Link *link) {
66 assert(link);
67
68 if (link->flags & IFF_LOOPBACK)
69 return false;
70
71 if (!link->network)
72 return false;
73
74 return link->network->dhcp_server;
75 }
76
77 static bool link_ipv4ll_enabled(Link *link) {
78 assert(link);
79
80 if (link->flags & IFF_LOOPBACK)
81 return false;
82
83 if (!link->network)
84 return false;
85
86 if (streq_ptr(link->kind, "wireguard"))
87 return false;
88
89 return link->network->link_local & ADDRESS_FAMILY_IPV4;
90 }
91
92 static bool link_ipv6ll_enabled(Link *link) {
93 assert(link);
94
95 if (!socket_ipv6_is_supported())
96 return false;
97
98 if (link->flags & IFF_LOOPBACK)
99 return false;
100
101 if (!link->network)
102 return false;
103
104 if (streq_ptr(link->kind, "wireguard"))
105 return false;
106
107 return link->network->link_local & ADDRESS_FAMILY_IPV6;
108 }
109
110 static bool link_ipv6_enabled(Link *link) {
111 assert(link);
112
113 if (!socket_ipv6_is_supported())
114 return false;
115
116 if (link->network->bridge)
117 return false;
118
119 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
120 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
121 }
122
123 static bool link_radv_enabled(Link *link) {
124 assert(link);
125
126 if (!link_ipv6ll_enabled(link))
127 return false;
128
129 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
130 }
131
132 static bool link_lldp_rx_enabled(Link *link) {
133 assert(link);
134
135 if (link->flags & IFF_LOOPBACK)
136 return false;
137
138 if (link->iftype != ARPHRD_ETHER)
139 return false;
140
141 if (!link->network)
142 return false;
143
144 /* LLDP should be handled on bridge slaves as those have a direct
145 * connection to their peers not on the bridge master. Linux doesn't
146 * even (by default) forward lldp packets to the bridge master.*/
147 if (streq_ptr("bridge", link->kind))
148 return false;
149
150 return link->network->lldp_mode != LLDP_MODE_NO;
151 }
152
153 static bool link_lldp_emit_enabled(Link *link) {
154 assert(link);
155
156 if (link->flags & IFF_LOOPBACK)
157 return false;
158
159 if (link->iftype != ARPHRD_ETHER)
160 return false;
161
162 if (!link->network)
163 return false;
164
165 return link->network->lldp_emit != LLDP_EMIT_NO;
166 }
167
168 static bool link_ipv4_forward_enabled(Link *link) {
169 assert(link);
170
171 if (link->flags & IFF_LOOPBACK)
172 return false;
173
174 if (!link->network)
175 return false;
176
177 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
178 return false;
179
180 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
181 }
182
183 static bool link_ipv6_forward_enabled(Link *link) {
184 assert(link);
185
186 if (!socket_ipv6_is_supported())
187 return false;
188
189 if (link->flags & IFF_LOOPBACK)
190 return false;
191
192 if (!link->network)
193 return false;
194
195 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
196 return false;
197
198 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
199 }
200
201 static bool link_proxy_arp_enabled(Link *link) {
202 assert(link);
203
204 if (link->flags & IFF_LOOPBACK)
205 return false;
206
207 if (!link->network)
208 return false;
209
210 if (link->network->proxy_arp < 0)
211 return false;
212
213 return true;
214 }
215
216 static bool link_ipv6_accept_ra_enabled(Link *link) {
217 assert(link);
218
219 if (!socket_ipv6_is_supported())
220 return false;
221
222 if (link->flags & IFF_LOOPBACK)
223 return false;
224
225 if (!link->network)
226 return false;
227
228 if (!link_ipv6ll_enabled(link))
229 return false;
230
231 /* If unset use system default (enabled if local forwarding is disabled.
232 * disabled if local forwarding is enabled).
233 * If set, ignore or enforce RA independent of local forwarding state.
234 */
235 if (link->network->ipv6_accept_ra < 0)
236 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
237 return !link_ipv6_forward_enabled(link);
238 else if (link->network->ipv6_accept_ra > 0)
239 /* accept RA even if ip_forward is enabled */
240 return true;
241 else
242 /* ignore RA */
243 return false;
244 }
245
246 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
247 assert(link);
248
249 if (!socket_ipv6_is_supported())
250 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
251
252 if (link->flags & IFF_LOOPBACK)
253 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
254
255 if (!link->network)
256 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
257
258 return link->network->ipv6_privacy_extensions;
259 }
260
261 static int link_enable_ipv6(Link *link) {
262 const char *p = NULL;
263 bool disabled;
264 int r;
265
266 if (link->flags & IFF_LOOPBACK)
267 return 0;
268
269 disabled = !link_ipv6_enabled(link);
270
271 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/disable_ipv6");
272
273 r = write_string_file(p, one_zero(disabled), WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
274 if (r < 0)
275 log_link_warning_errno(link, r, "Cannot %s IPv6 for interface %s: %m",
276 enable_disable(!disabled), link->ifname);
277 else
278 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
279
280 return 0;
281 }
282
283 void link_update_operstate(Link *link) {
284 LinkOperationalState operstate;
285 assert(link);
286
287 if (link->kernel_operstate == IF_OPER_DORMANT)
288 operstate = LINK_OPERSTATE_DORMANT;
289 else if (link_has_carrier(link)) {
290 Address *address;
291 uint8_t scope = RT_SCOPE_NOWHERE;
292 Iterator i;
293
294 /* if we have carrier, check what addresses we have */
295 SET_FOREACH(address, link->addresses, i) {
296 if (!address_is_ready(address))
297 continue;
298
299 if (address->scope < scope)
300 scope = address->scope;
301 }
302
303 /* for operstate we also take foreign addresses into account */
304 SET_FOREACH(address, link->addresses_foreign, i) {
305 if (!address_is_ready(address))
306 continue;
307
308 if (address->scope < scope)
309 scope = address->scope;
310 }
311
312 if (scope < RT_SCOPE_SITE)
313 /* universally accessible addresses found */
314 operstate = LINK_OPERSTATE_ROUTABLE;
315 else if (scope < RT_SCOPE_HOST)
316 /* only link or site local addresses found */
317 operstate = LINK_OPERSTATE_DEGRADED;
318 else
319 /* no useful addresses found */
320 operstate = LINK_OPERSTATE_CARRIER;
321 } else if (link->flags & IFF_UP)
322 operstate = LINK_OPERSTATE_NO_CARRIER;
323 else
324 operstate = LINK_OPERSTATE_OFF;
325
326 if (link->operstate != operstate) {
327 link->operstate = operstate;
328 link_send_changed(link, "OperationalState", NULL);
329 link_dirty(link);
330 }
331 }
332
333 #define FLAG_STRING(string, flag, old, new) \
334 (((old ^ new) & flag) \
335 ? ((old & flag) ? (" -" string) : (" +" string)) \
336 : "")
337
338 static int link_update_flags(Link *link, sd_netlink_message *m) {
339 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
340 uint8_t operstate;
341 int r;
342
343 assert(link);
344
345 r = sd_rtnl_message_link_get_flags(m, &flags);
346 if (r < 0)
347 return log_link_warning_errno(link, r, "Could not get link flags: %m");
348
349 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
350 if (r < 0)
351 /* if we got a message without operstate, take it to mean
352 the state was unchanged */
353 operstate = link->kernel_operstate;
354
355 if ((link->flags == flags) && (link->kernel_operstate == operstate))
356 return 0;
357
358 if (link->flags != flags) {
359 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",
360 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
361 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
362 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
363 FLAG_STRING("UP", IFF_UP, link->flags, flags),
364 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
365 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
366 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
367 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
368 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
369 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
370 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
371 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
372 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
373 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
374 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
375 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
376 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
377 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
378 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
379
380 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
381 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
382 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
383 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
384 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
385 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
386 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
387 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
388
389 /* link flags are currently at most 18 bits, let's align to
390 * printing 20 */
391 if (unknown_flags_added)
392 log_link_debug(link,
393 "Unknown link flags gained: %#.5x (ignoring)",
394 unknown_flags_added);
395
396 if (unknown_flags_removed)
397 log_link_debug(link,
398 "Unknown link flags lost: %#.5x (ignoring)",
399 unknown_flags_removed);
400 }
401
402 link->flags = flags;
403 link->kernel_operstate = operstate;
404
405 link_update_operstate(link);
406
407 return 0;
408 }
409
410 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_unref);
411
412 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
413 _cleanup_(link_unrefp) Link *link = NULL;
414 uint16_t type;
415 const char *ifname, *kind = NULL;
416 int r, ifindex;
417 unsigned short iftype;
418
419 assert(manager);
420 assert(message);
421 assert(ret);
422
423 /* check for link kind */
424 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
425 if (r == 0) {
426 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
427 r = sd_netlink_message_exit_container(message);
428 if (r < 0)
429 return r;
430 }
431
432 r = sd_netlink_message_get_type(message, &type);
433 if (r < 0)
434 return r;
435 else if (type != RTM_NEWLINK)
436 return -EINVAL;
437
438 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
439 if (r < 0)
440 return r;
441 else if (ifindex <= 0)
442 return -EINVAL;
443
444 r = sd_rtnl_message_link_get_type(message, &iftype);
445 if (r < 0)
446 return r;
447
448 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
449 if (r < 0)
450 return r;
451
452 link = new(Link, 1);
453 if (!link)
454 return -ENOMEM;
455
456 *link = (Link) {
457 .n_ref = 1,
458 .manager = manager,
459 .state = LINK_STATE_PENDING,
460 .rtnl_extended_attrs = true,
461 .ifindex = ifindex,
462 .iftype = iftype,
463 };
464
465 link->ifname = strdup(ifname);
466 if (!link->ifname)
467 return -ENOMEM;
468
469 if (kind) {
470 link->kind = strdup(kind);
471 if (!link->kind)
472 return -ENOMEM;
473 }
474
475 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
476 if (r < 0)
477 log_link_debug_errno(link, r, "New device has no master, continuing without");
478
479 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
480 if (r < 0)
481 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
482
483 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
484 return -ENOMEM;
485
486 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
487 return -ENOMEM;
488
489 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
490 return -ENOMEM;
491
492 r = hashmap_ensure_allocated(&manager->links, NULL);
493 if (r < 0)
494 return r;
495
496 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
497 if (r < 0)
498 return r;
499
500 r = link_update_flags(link, message);
501 if (r < 0)
502 return r;
503
504 *ret = TAKE_PTR(link);
505
506 return 0;
507 }
508
509 static void link_detach_from_manager(Link *link) {
510 if (!link || !link->manager)
511 return;
512
513 hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex));
514 set_remove(link->manager->links_requesting_uuid, link);
515 link_clean(link);
516
517 link->manager = NULL;
518 }
519
520 static Link *link_free(Link *link) {
521 Address *address;
522 Link *carrier;
523 Route *route;
524 Iterator i;
525
526 assert(link);
527
528 while ((route = set_first(link->routes)))
529 route_free(route);
530
531 while ((route = set_first(link->routes_foreign)))
532 route_free(route);
533
534 link->routes = set_free(link->routes);
535 link->routes_foreign = set_free(link->routes_foreign);
536
537 while ((address = set_first(link->addresses)))
538 address_free(address);
539
540 while ((address = set_first(link->addresses_foreign)))
541 address_free(address);
542
543 link->addresses = set_free(link->addresses);
544 link->addresses_foreign = set_free(link->addresses_foreign);
545
546 while ((address = link->pool_addresses)) {
547 LIST_REMOVE(addresses, link->pool_addresses, address);
548 address_free(address);
549 }
550
551 sd_dhcp_server_unref(link->dhcp_server);
552 sd_dhcp_client_unref(link->dhcp_client);
553 sd_dhcp_lease_unref(link->dhcp_lease);
554
555 link_lldp_emit_stop(link);
556
557 free(link->lease_file);
558
559 sd_lldp_unref(link->lldp);
560 free(link->lldp_file);
561
562 ndisc_flush(link);
563
564 sd_ipv4ll_unref(link->ipv4ll);
565 sd_dhcp6_client_unref(link->dhcp6_client);
566 sd_ndisc_unref(link->ndisc);
567 sd_radv_unref(link->radv);
568
569 link_detach_from_manager(link);
570
571 free(link->ifname);
572
573 free(link->kind);
574
575 (void) unlink(link->state_file);
576 free(link->state_file);
577
578 sd_device_unref(link->sd_device);
579
580 HASHMAP_FOREACH (carrier, link->bound_to_links, i)
581 hashmap_remove(link->bound_to_links, INT_TO_PTR(carrier->ifindex));
582 hashmap_free(link->bound_to_links);
583
584 HASHMAP_FOREACH (carrier, link->bound_by_links, i)
585 hashmap_remove(link->bound_by_links, INT_TO_PTR(carrier->ifindex));
586 hashmap_free(link->bound_by_links);
587
588 return mfree(link);
589 }
590
591 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
592
593 void link_netlink_destroy_callback(void *userdata) {
594 Link *link = userdata;
595
596 assert(userdata);
597
598 link_unref(link);
599 }
600
601 int link_get(Manager *m, int ifindex, Link **ret) {
602 Link *link;
603
604 assert(m);
605 assert(ifindex);
606 assert(ret);
607
608 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
609 if (!link)
610 return -ENODEV;
611
612 *ret = link;
613
614 return 0;
615 }
616
617 static void link_set_state(Link *link, LinkState state) {
618 assert(link);
619
620 if (link->state == state)
621 return;
622
623 link->state = state;
624
625 link_send_changed(link, "AdministrativeState", NULL);
626 }
627
628 static void link_enter_unmanaged(Link *link) {
629 assert(link);
630
631 log_link_debug(link, "Unmanaged");
632
633 link_set_state(link, LINK_STATE_UNMANAGED);
634
635 link_dirty(link);
636 }
637
638 static int link_stop_clients(Link *link) {
639 int r = 0, k;
640
641 assert(link);
642 assert(link->manager);
643 assert(link->manager->event);
644
645 if (link->dhcp_client) {
646 k = sd_dhcp_client_stop(link->dhcp_client);
647 if (k < 0)
648 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
649 }
650
651 if (link->ipv4ll) {
652 k = sd_ipv4ll_stop(link->ipv4ll);
653 if (k < 0)
654 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
655 }
656
657 if (link->dhcp6_client) {
658 k = sd_dhcp6_client_stop(link->dhcp6_client);
659 if (k < 0)
660 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
661 }
662
663 if (link->ndisc) {
664 k = sd_ndisc_stop(link->ndisc);
665 if (k < 0)
666 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
667 }
668
669 if (link->radv) {
670 k = sd_radv_stop(link->radv);
671 if (k < 0)
672 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
673 }
674
675 link_lldp_emit_stop(link);
676 return r;
677 }
678
679 void link_enter_failed(Link *link) {
680 assert(link);
681
682 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
683 return;
684
685 log_link_warning(link, "Failed");
686
687 link_set_state(link, LINK_STATE_FAILED);
688
689 link_stop_clients(link);
690
691 link_dirty(link);
692 }
693
694 static Address* link_find_dhcp_server_address(Link *link) {
695 Address *address;
696
697 assert(link);
698 assert(link->network);
699
700 /* The first statically configured address if there is any */
701 LIST_FOREACH(addresses, address, link->network->static_addresses) {
702
703 if (address->family != AF_INET)
704 continue;
705
706 if (in_addr_is_null(address->family, &address->in_addr))
707 continue;
708
709 return address;
710 }
711
712 /* If that didn't work, find a suitable address we got from the pool */
713 LIST_FOREACH(addresses, address, link->pool_addresses) {
714 if (address->family != AF_INET)
715 continue;
716
717 return address;
718 }
719
720 return NULL;
721 }
722
723 static void link_enter_configured(Link *link) {
724 assert(link);
725 assert(link->network);
726
727 if (link->state != LINK_STATE_SETTING_ROUTES)
728 return;
729
730 log_link_info(link, "Configured");
731
732 link_set_state(link, LINK_STATE_CONFIGURED);
733
734 link_dirty(link);
735 }
736
737 void link_check_ready(Link *link) {
738 Address *a;
739 Iterator i;
740
741 assert(link);
742
743 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
744 return;
745
746 if (!link->network)
747 return;
748
749 if (!link->static_routes_configured)
750 return;
751
752 if (!link->routing_policy_rules_configured)
753 return;
754
755 if (link_ipv4ll_enabled(link))
756 if (!link->ipv4ll_address ||
757 !link->ipv4ll_route)
758 return;
759
760 if (!link->network->bridge) {
761
762 if (link_ipv6ll_enabled(link))
763 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) > 0)
764 return;
765
766 if ((link_dhcp4_enabled(link) && !link_dhcp6_enabled(link) &&
767 !link->dhcp4_configured) ||
768 (link_dhcp6_enabled(link) && !link_dhcp4_enabled(link) &&
769 !link->dhcp6_configured) ||
770 (link_dhcp4_enabled(link) && link_dhcp6_enabled(link) &&
771 !link->dhcp4_configured && !link->dhcp6_configured))
772 return;
773
774 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
775 return;
776 }
777
778 SET_FOREACH(a, link->addresses, i)
779 if (!address_is_ready(a))
780 return;
781
782 if (link->state != LINK_STATE_CONFIGURED)
783 link_enter_configured(link);
784
785 return;
786 }
787
788 static int link_set_routing_policy_rule(Link *link) {
789 RoutingPolicyRule *rule, *rrule = NULL;
790 int r;
791
792 assert(link);
793 assert(link->network);
794
795 LIST_FOREACH(rules, rule, link->network->rules) {
796 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
797 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif, &rrule);
798 if (r == 0) {
799 (void) routing_policy_rule_make_local(link->manager, rrule);
800 continue;
801 }
802
803 r = routing_policy_rule_configure(rule, link, link_routing_policy_rule_handler, false);
804 if (r < 0) {
805 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
806 link_enter_failed(link);
807 return r;
808 }
809
810 link->routing_policy_rule_messages++;
811 }
812
813 routing_policy_rule_purge(link->manager, link);
814 if (link->routing_policy_rule_messages == 0) {
815 link->routing_policy_rules_configured = true;
816 link_check_ready(link);
817 } else
818 log_link_debug(link, "Setting routing policy rules");
819
820 return 0;
821 }
822
823 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
824 Link *link = userdata;
825 int r;
826
827 assert(link);
828 assert(link->route_messages > 0);
829 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
830 LINK_STATE_SETTING_ROUTES, LINK_STATE_FAILED,
831 LINK_STATE_LINGER));
832
833 link->route_messages--;
834
835 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
836 return 1;
837
838 r = sd_netlink_message_get_errno(m);
839 if (r < 0 && r != -EEXIST)
840 log_link_warning_errno(link, r, "Could not set route: %m");
841
842 if (link->route_messages == 0) {
843 log_link_debug(link, "Routes set");
844 link->static_routes_configured = true;
845 link_check_ready(link);
846 }
847
848 return 1;
849 }
850
851 static int link_enter_set_routes(Link *link) {
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 LIST_FOREACH(routes, rt, link->network->static_routes) {
864 r = route_configure(rt, link, route_handler);
865 if (r < 0) {
866 log_link_warning_errno(link, r, "Could not set routes: %m");
867 link_enter_failed(link);
868 return r;
869 }
870
871 link->route_messages++;
872 }
873
874 if (link->route_messages == 0) {
875 link->static_routes_configured = true;
876 link_check_ready(link);
877 } else
878 log_link_debug(link, "Setting routes");
879
880 return 0;
881 }
882
883 int link_route_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
884 Link *link = userdata;
885 int r;
886
887 assert(m);
888 assert(link);
889 assert(link->ifname);
890
891 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
892 return 1;
893
894 r = sd_netlink_message_get_errno(m);
895 if (r < 0 && r != -ESRCH)
896 log_link_warning_errno(link, r, "Could not drop route: %m");
897
898 return 1;
899 }
900
901 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
902 Link *link = userdata;
903 int r;
904
905 assert(rtnl);
906 assert(m);
907 assert(link);
908 assert(link->ifname);
909 assert(link->address_messages > 0);
910 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
911 LINK_STATE_FAILED, LINK_STATE_LINGER));
912
913 link->address_messages--;
914
915 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
916 return 1;
917
918 r = sd_netlink_message_get_errno(m);
919 if (r < 0 && r != -EEXIST)
920 log_link_warning_errno(link, r, "could not set address: %m");
921 else if (r >= 0)
922 manager_rtnl_process_address(rtnl, m, link->manager);
923
924 if (link->address_messages == 0) {
925 log_link_debug(link, "Addresses set");
926 link_enter_set_routes(link);
927 }
928
929 return 1;
930 }
931
932 static int address_label_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
933 Link *link = userdata;
934 int r;
935
936 assert(rtnl);
937 assert(m);
938 assert(link);
939 assert(link->ifname);
940 assert(link->address_label_messages > 0);
941
942 link->address_label_messages--;
943
944 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
945 return 1;
946
947 r = sd_netlink_message_get_errno(m);
948 if (r < 0 && r != -EEXIST)
949 log_link_warning_errno(link, r, "could not set address label: %m");
950 else if (r >= 0)
951 manager_rtnl_process_address(rtnl, m, link->manager);
952
953 if (link->address_label_messages == 0)
954 log_link_debug(link, "Addresses label set");
955
956 return 1;
957 }
958
959 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
960 _cleanup_free_ struct in_addr *addresses = NULL;
961 size_t n_addresses = 0, n_allocated = 0;
962 unsigned i;
963
964 log_debug("Copying DNS server information from %s", link->ifname);
965
966 if (!link->network)
967 return 0;
968
969 for (i = 0; i < link->network->n_dns; i++) {
970 struct in_addr ia;
971
972 /* Only look for IPv4 addresses */
973 if (link->network->dns[i].family != AF_INET)
974 continue;
975
976 ia = link->network->dns[i].address.in;
977
978 /* Never propagate obviously borked data */
979 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
980 continue;
981
982 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
983 return log_oom();
984
985 addresses[n_addresses++] = ia;
986 }
987
988 if (link->network->dhcp_use_dns && link->dhcp_lease) {
989 const struct in_addr *da = NULL;
990 int n;
991
992 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
993 if (n > 0) {
994
995 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
996 return log_oom();
997
998 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
999 n_addresses += n;
1000 }
1001 }
1002
1003 if (n_addresses <= 0)
1004 return 0;
1005
1006 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
1007 }
1008
1009 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1010 _cleanup_free_ struct in_addr *addresses = NULL;
1011 size_t n_addresses = 0, n_allocated = 0;
1012 char **a;
1013
1014 if (!link->network)
1015 return 0;
1016
1017 log_debug("Copying NTP server information from %s", link->ifname);
1018
1019 STRV_FOREACH(a, link->network->ntp) {
1020 struct in_addr ia;
1021
1022 /* Only look for IPv4 addresses */
1023 if (inet_pton(AF_INET, *a, &ia) <= 0)
1024 continue;
1025
1026 /* Never propagate obviously borked data */
1027 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1028 continue;
1029
1030 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1031 return log_oom();
1032
1033 addresses[n_addresses++] = ia;
1034 }
1035
1036 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1037 const struct in_addr *da = NULL;
1038 int n;
1039
1040 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1041 if (n > 0) {
1042
1043 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1044 return log_oom();
1045
1046 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
1047 n_addresses += n;
1048 }
1049 }
1050
1051 if (n_addresses <= 0)
1052 return 0;
1053
1054 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1055 }
1056
1057 static int link_set_bridge_fdb(Link *link) {
1058 FdbEntry *fdb_entry;
1059 int r;
1060
1061 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1062 r = fdb_entry_configure(link, fdb_entry);
1063 if (r < 0)
1064 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1065 }
1066
1067 return 0;
1068 }
1069
1070 static int link_enter_set_addresses(Link *link) {
1071 AddressLabel *label;
1072 Address *ad;
1073 int r;
1074
1075 assert(link);
1076 assert(link->network);
1077 assert(link->state != _LINK_STATE_INVALID);
1078
1079 r = link_set_bridge_fdb(link);
1080 if (r < 0)
1081 return r;
1082
1083 link_set_state(link, LINK_STATE_SETTING_ADDRESSES);
1084
1085 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1086 r = address_configure(ad, link, address_handler, false);
1087 if (r < 0) {
1088 log_link_warning_errno(link, r, "Could not set addresses: %m");
1089 link_enter_failed(link);
1090 return r;
1091 }
1092
1093 link->address_messages++;
1094 }
1095
1096 LIST_FOREACH(labels, label, link->network->address_labels) {
1097 r = address_label_configure(label, link, address_label_handler, false);
1098 if (r < 0) {
1099 log_link_warning_errno(link, r, "Could not set address label: %m");
1100 link_enter_failed(link);
1101 return r;
1102 }
1103
1104 link->address_label_messages++;
1105 }
1106
1107 /* now that we can figure out a default address for the dhcp server,
1108 start it */
1109 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1110 Address *address;
1111 Link *uplink = NULL;
1112 bool acquired_uplink = false;
1113
1114 address = link_find_dhcp_server_address(link);
1115 if (!address) {
1116 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1117 link_enter_failed(link);
1118 return 0;
1119 }
1120
1121 /* use the server address' subnet as the pool */
1122 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1123 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1124 if (r < 0)
1125 return r;
1126
1127 /* TODO:
1128 r = sd_dhcp_server_set_router(link->dhcp_server,
1129 &main_address->in_addr.in);
1130 if (r < 0)
1131 return r;
1132 */
1133
1134 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1135 r = sd_dhcp_server_set_max_lease_time(
1136 link->dhcp_server,
1137 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1138 if (r < 0)
1139 return r;
1140 }
1141
1142 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1143 r = sd_dhcp_server_set_default_lease_time(
1144 link->dhcp_server,
1145 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1146 if (r < 0)
1147 return r;
1148 }
1149
1150 if (link->network->dhcp_server_emit_dns) {
1151
1152 if (link->network->n_dhcp_server_dns > 0)
1153 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1154 else {
1155 uplink = manager_find_uplink(link->manager, link);
1156 acquired_uplink = true;
1157
1158 if (!uplink) {
1159 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1160 r = 0;
1161 } else
1162 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1163 }
1164 if (r < 0)
1165 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1166 }
1167
1168 if (link->network->dhcp_server_emit_ntp) {
1169
1170 if (link->network->n_dhcp_server_ntp > 0)
1171 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1172 else {
1173 if (!acquired_uplink)
1174 uplink = manager_find_uplink(link->manager, link);
1175
1176 if (!uplink) {
1177 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1178 r = 0;
1179 } else
1180 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1181
1182 }
1183 if (r < 0)
1184 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1185 }
1186
1187 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1188 if (r < 0)
1189 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1190
1191 if (link->network->dhcp_server_emit_timezone) {
1192 _cleanup_free_ char *buffer = NULL;
1193 const char *tz = NULL;
1194
1195 if (link->network->dhcp_server_timezone)
1196 tz = link->network->dhcp_server_timezone;
1197 else {
1198 r = get_timezone(&buffer);
1199 if (r < 0)
1200 log_warning_errno(r, "Failed to determine timezone: %m");
1201 else
1202 tz = buffer;
1203 }
1204
1205 if (tz) {
1206 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1207 if (r < 0)
1208 return r;
1209 }
1210 }
1211
1212 r = sd_dhcp_server_start(link->dhcp_server);
1213 if (r < 0) {
1214 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1215
1216 link_enter_failed(link);
1217
1218 return 0;
1219 }
1220
1221 log_link_debug(link, "Offering DHCPv4 leases");
1222 }
1223
1224 if (link->address_messages == 0)
1225 link_enter_set_routes(link);
1226 else
1227 log_link_debug(link, "Setting addresses");
1228
1229 return 0;
1230 }
1231
1232 int link_address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1233 Link *link = userdata;
1234 int r;
1235
1236 assert(m);
1237 assert(link);
1238 assert(link->ifname);
1239
1240 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1241 return 1;
1242
1243 r = sd_netlink_message_get_errno(m);
1244 if (r < 0 && r != -EADDRNOTAVAIL)
1245 log_link_warning_errno(link, r, "Could not drop address: %m");
1246
1247 return 1;
1248 }
1249
1250 static int link_set_bridge_vlan(Link *link) {
1251 int r = 0;
1252
1253 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1254 if (r < 0)
1255 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1256
1257 return r;
1258 }
1259
1260 static int link_set_proxy_arp(Link *link) {
1261 const char *p = NULL;
1262 int r;
1263
1264 if (!link_proxy_arp_enabled(link))
1265 return 0;
1266
1267 p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/proxy_arp");
1268
1269 r = write_string_file(p, one_zero(link->network->proxy_arp), WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
1270 if (r < 0)
1271 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1272
1273 return 0;
1274 }
1275
1276 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1277 Link *link = userdata;
1278 int r;
1279
1280 assert(link);
1281
1282 log_link_debug(link, "Set link");
1283
1284 r = sd_netlink_message_get_errno(m);
1285 if (r < 0 && r != -EEXIST) {
1286 log_link_error_errno(link, r, "Could not join netdev: %m");
1287 link_enter_failed(link);
1288 }
1289
1290 return 1;
1291 }
1292
1293 static int link_configure_after_setting_mtu(Link *link);
1294
1295 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1296 Link *link = userdata;
1297 int r;
1298
1299 assert(m);
1300 assert(link);
1301 assert(link->ifname);
1302
1303 link->setting_mtu = false;
1304
1305 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1306 return 1;
1307
1308 r = sd_netlink_message_get_errno(m);
1309 if (r < 0) {
1310 log_link_warning_errno(link, r, "Could not set MTU: %m");
1311 return 1;
1312 }
1313
1314 log_link_debug(link, "Setting MTU done.");
1315
1316 if (link->state == LINK_STATE_PENDING)
1317 (void) link_configure_after_setting_mtu(link);
1318
1319 return 1;
1320 }
1321
1322 int link_set_mtu(Link *link, uint32_t mtu) {
1323 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1324 int r;
1325
1326 assert(link);
1327 assert(link->manager);
1328 assert(link->manager->rtnl);
1329
1330 if (link->mtu == mtu || link->setting_mtu)
1331 return 0;
1332
1333 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1334
1335 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1336 if (r < 0)
1337 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1338
1339 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1340 * for this interface, or if it is a bridge slave, then disable IPv6 else enable it. */
1341 (void) link_enable_ipv6(link);
1342
1343 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1344 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1345 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1346
1347 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1348 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1349
1350 mtu = IPV6_MIN_MTU;
1351 }
1352
1353 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1354 if (r < 0)
1355 return log_link_error_errno(link, r, "Could not append MTU: %m");
1356
1357 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1358 link_netlink_destroy_callback, link, 0, __func__);
1359 if (r < 0)
1360 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1361
1362 link_ref(link);
1363 link->setting_mtu = true;
1364
1365 return 0;
1366 }
1367
1368 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1369 Link *link = userdata;
1370 int r;
1371
1372 assert(m);
1373 assert(link);
1374 assert(link->ifname);
1375
1376 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1377 return 1;
1378
1379 r = sd_netlink_message_get_errno(m);
1380 if (r < 0)
1381 log_link_warning_errno(link, r, "Could not set link flags: %m");
1382
1383 return 1;
1384 }
1385
1386 static int link_set_flags(Link *link) {
1387 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1388 unsigned ifi_change = 0;
1389 unsigned ifi_flags = 0;
1390 int r;
1391
1392 assert(link);
1393 assert(link->manager);
1394 assert(link->manager->rtnl);
1395
1396 if (link->flags & IFF_LOOPBACK)
1397 return 0;
1398
1399 if (!link->network)
1400 return 0;
1401
1402 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1403 return 0;
1404
1405 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1406 if (r < 0)
1407 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1408
1409 if (link->network->arp >= 0) {
1410 ifi_change |= IFF_NOARP;
1411 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1412 }
1413
1414 if (link->network->multicast >= 0) {
1415 ifi_change |= IFF_MULTICAST;
1416 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1417 }
1418
1419 if (link->network->allmulticast >= 0) {
1420 ifi_change |= IFF_ALLMULTI;
1421 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1422 }
1423
1424 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1425 if (r < 0)
1426 return log_link_error_errno(link, r, "Could not set link flags: %m");
1427
1428 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1429 link_netlink_destroy_callback, link, 0, __func__);
1430 if (r < 0)
1431 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1432
1433 link_ref(link);
1434
1435 return 0;
1436 }
1437
1438 static int link_set_bridge(Link *link) {
1439 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1440 int r;
1441
1442 assert(link);
1443 assert(link->network);
1444
1445 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1446 if (r < 0)
1447 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1448
1449 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1450 if (r < 0)
1451 return log_link_error_errno(link, r, "Could not set message family: %m");
1452
1453 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1454 if (r < 0)
1455 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1456
1457 if (link->network->use_bpdu >= 0) {
1458 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
1459 if (r < 0)
1460 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1461 }
1462
1463 if (link->network->hairpin >= 0) {
1464 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1465 if (r < 0)
1466 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1467 }
1468
1469 if (link->network->fast_leave >= 0) {
1470 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1471 if (r < 0)
1472 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1473 }
1474
1475 if (link->network->allow_port_to_be_root >= 0) {
1476 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
1477 if (r < 0)
1478 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1479
1480 }
1481
1482 if (link->network->unicast_flood >= 0) {
1483 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1484 if (r < 0)
1485 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1486
1487 }
1488
1489 if (link->network->cost != 0) {
1490 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1491 if (r < 0)
1492 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1493 }
1494 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1495 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1496 if (r < 0)
1497 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1498 }
1499
1500 r = sd_netlink_message_close_container(req);
1501 if (r < 0)
1502 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1503
1504 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, link_set_handler,
1505 link_netlink_destroy_callback, link, 0, __func__);
1506 if (r < 0)
1507 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1508
1509 link_ref(link);
1510
1511 return r;
1512 }
1513
1514 static int link_bond_set(Link *link) {
1515 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1516 int r;
1517
1518 assert(link);
1519 assert(link->network);
1520
1521 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1522 if (r < 0)
1523 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1524
1525 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1526 if (r < 0)
1527 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1528
1529 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1530 if (r < 0)
1531 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1532
1533 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1534 if (r < 0)
1535 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1536
1537 if (link->network->active_slave) {
1538 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1539 if (r < 0)
1540 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1541 }
1542
1543 if (link->network->primary_slave) {
1544 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1545 if (r < 0)
1546 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1547 }
1548
1549 r = sd_netlink_message_close_container(req);
1550 if (r < 0)
1551 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1552
1553 r = sd_netlink_message_close_container(req);
1554 if (r < 0)
1555 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1556
1557 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1558 link_netlink_destroy_callback, link, 0, __func__);
1559 if (r < 0)
1560 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1561
1562 link_ref(link);
1563
1564 return r;
1565 }
1566
1567 static int link_lldp_save(Link *link) {
1568 _cleanup_free_ char *temp_path = NULL;
1569 _cleanup_fclose_ FILE *f = NULL;
1570 sd_lldp_neighbor **l = NULL;
1571 int n = 0, r, i;
1572
1573 assert(link);
1574 assert(link->lldp_file);
1575
1576 if (!link->lldp) {
1577 (void) unlink(link->lldp_file);
1578 return 0;
1579 }
1580
1581 r = sd_lldp_get_neighbors(link->lldp, &l);
1582 if (r < 0)
1583 goto finish;
1584 if (r == 0) {
1585 (void) unlink(link->lldp_file);
1586 goto finish;
1587 }
1588
1589 n = r;
1590
1591 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1592 if (r < 0)
1593 goto finish;
1594
1595 fchmod(fileno(f), 0644);
1596
1597 for (i = 0; i < n; i++) {
1598 const void *p;
1599 le64_t u;
1600 size_t sz;
1601
1602 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1603 if (r < 0)
1604 goto finish;
1605
1606 u = htole64(sz);
1607 (void) fwrite(&u, 1, sizeof(u), f);
1608 (void) fwrite(p, 1, sz, f);
1609 }
1610
1611 r = fflush_and_check(f);
1612 if (r < 0)
1613 goto finish;
1614
1615 if (rename(temp_path, link->lldp_file) < 0) {
1616 r = -errno;
1617 goto finish;
1618 }
1619
1620 finish:
1621 if (r < 0) {
1622 (void) unlink(link->lldp_file);
1623 if (temp_path)
1624 (void) unlink(temp_path);
1625
1626 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1627 }
1628
1629 if (l) {
1630 for (i = 0; i < n; i++)
1631 sd_lldp_neighbor_unref(l[i]);
1632 free(l);
1633 }
1634
1635 return r;
1636 }
1637
1638 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1639 Link *link = userdata;
1640 int r;
1641
1642 assert(link);
1643
1644 (void) link_lldp_save(link);
1645
1646 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1647 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1648
1649 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1650
1651 r = link_lldp_emit_start(link);
1652 if (r < 0)
1653 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1654 }
1655 }
1656
1657 static int link_acquire_ipv6_conf(Link *link) {
1658 int r;
1659
1660 assert(link);
1661
1662 if (link_ipv6_accept_ra_enabled(link)) {
1663 assert(link->ndisc);
1664
1665 log_link_debug(link, "Discovering IPv6 routers");
1666
1667 r = sd_ndisc_start(link->ndisc);
1668 if (r < 0 && r != -EBUSY)
1669 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1670 }
1671
1672 if (link_radv_enabled(link)) {
1673 assert(link->radv);
1674 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1675
1676 log_link_debug(link, "Starting IPv6 Router Advertisements");
1677
1678 r = sd_radv_start(link->radv);
1679 if (r < 0 && r != -EBUSY)
1680 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1681 }
1682
1683 (void) dhcp6_request_prefix_delegation(link);
1684
1685 return 0;
1686 }
1687
1688 static int link_acquire_ipv4_conf(Link *link) {
1689 int r;
1690
1691 assert(link);
1692 assert(link->network);
1693 assert(link->manager);
1694 assert(link->manager->event);
1695
1696 if (link_ipv4ll_enabled(link)) {
1697 assert(link->ipv4ll);
1698
1699 log_link_debug(link, "Acquiring IPv4 link-local address");
1700
1701 r = sd_ipv4ll_start(link->ipv4ll);
1702 if (r < 0)
1703 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1704 }
1705
1706 if (link_dhcp4_enabled(link)) {
1707 assert(link->dhcp_client);
1708
1709 log_link_debug(link, "Acquiring DHCPv4 lease");
1710
1711 r = sd_dhcp_client_start(link->dhcp_client);
1712 if (r < 0)
1713 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1714 }
1715
1716 return 0;
1717 }
1718
1719 static int link_acquire_conf(Link *link) {
1720 int r;
1721
1722 assert(link);
1723
1724 r = link_acquire_ipv4_conf(link);
1725 if (r < 0)
1726 return r;
1727
1728 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) == 0) {
1729 r = link_acquire_ipv6_conf(link);
1730 if (r < 0)
1731 return r;
1732 }
1733
1734 if (link_lldp_emit_enabled(link)) {
1735 r = link_lldp_emit_start(link);
1736 if (r < 0)
1737 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1738 }
1739
1740 return 0;
1741 }
1742
1743 bool link_has_carrier(Link *link) {
1744 /* see Documentation/networking/operstates.txt in the kernel sources */
1745
1746 if (link->kernel_operstate == IF_OPER_UP)
1747 return true;
1748
1749 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1750 /* operstate may not be implemented, so fall back to flags */
1751 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1752 return true;
1753
1754 return false;
1755 }
1756
1757 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1758 Link *link = userdata;
1759 int r;
1760
1761 assert(link);
1762
1763 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1764 return 1;
1765
1766 r = sd_netlink_message_get_errno(m);
1767 if (r < 0)
1768 /* we warn but don't fail the link, as it may be brought up later */
1769 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1770
1771 return 1;
1772 }
1773
1774 int link_up(Link *link) {
1775 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1776 uint8_t ipv6ll_mode;
1777 int r;
1778
1779 assert(link);
1780 assert(link->network);
1781 assert(link->manager);
1782 assert(link->manager->rtnl);
1783
1784 log_link_debug(link, "Bringing link up");
1785
1786 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1787 if (r < 0)
1788 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1789
1790 /* set it free if not enslaved with networkd */
1791 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1792 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1793 if (r < 0)
1794 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1795 }
1796
1797 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1798 if (r < 0)
1799 return log_link_error_errno(link, r, "Could not set link flags: %m");
1800
1801 if (link->network->mac) {
1802 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1803 if (r < 0)
1804 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1805 }
1806
1807 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1808 if (r < 0)
1809 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1810
1811 if (link_ipv6_enabled(link)) {
1812 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
1813 r = sd_netlink_message_open_container(req, AF_INET6);
1814 if (r < 0)
1815 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1816
1817 if (!link_ipv6ll_enabled(link))
1818 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1819 else {
1820 const char *p = NULL;
1821 _cleanup_free_ char *stable_secret = NULL;
1822
1823 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/stable_secret");
1824 r = read_one_line_file(p, &stable_secret);
1825
1826 if (r < 0)
1827 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1828 else
1829 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1830 }
1831 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1832 if (r < 0)
1833 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1834
1835 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
1836 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
1837 if (r < 0)
1838 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
1839 }
1840
1841 r = sd_netlink_message_close_container(req);
1842 if (r < 0)
1843 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1844 }
1845
1846 r = sd_netlink_message_close_container(req);
1847 if (r < 0)
1848 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1849
1850 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1851 link_netlink_destroy_callback, link, 0, __func__);
1852 if (r < 0)
1853 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1854
1855 link_ref(link);
1856
1857 return 0;
1858 }
1859
1860 static int link_up_can(Link *link) {
1861 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1862 int r;
1863
1864 assert(link);
1865
1866 log_link_debug(link, "Bringing CAN link up");
1867
1868 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1869 if (r < 0)
1870 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1871
1872 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1873 if (r < 0)
1874 return log_link_error_errno(link, r, "Could not set link flags: %m");
1875
1876 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1877 link_netlink_destroy_callback, link, 0, __func__);
1878 if (r < 0)
1879 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1880
1881 link_ref(link);
1882
1883 return 0;
1884 }
1885
1886 static int link_set_can(Link *link) {
1887 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
1888 int r;
1889
1890 assert(link);
1891 assert(link->network);
1892 assert(link->manager);
1893 assert(link->manager->rtnl);
1894
1895 log_link_debug(link, "link_set_can");
1896
1897 r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
1898 if (r < 0)
1899 return log_link_error_errno(link, r, "Failed to allocate netlink message: %m");
1900
1901 r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
1902 if (r < 0)
1903 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1904
1905 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
1906 if (r < 0)
1907 return log_link_error_errno(link, r, "Failed to open netlink container: %m");
1908
1909 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
1910 if (r < 0)
1911 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1912
1913 if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) {
1914 struct can_bittiming bt = {
1915 .bitrate = link->network->can_bitrate,
1916 .sample_point = link->network->can_sample_point,
1917 };
1918
1919 if (link->network->can_bitrate > UINT32_MAX) {
1920 log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate);
1921 return -ERANGE;
1922 }
1923
1924 log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate);
1925 if (link->network->can_sample_point > 0)
1926 log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
1927 else
1928 log_link_debug(link, "Using default sample point");
1929
1930 r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
1931 if (r < 0)
1932 return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
1933 }
1934
1935 if (link->network->can_restart_us > 0) {
1936 char time_string[FORMAT_TIMESPAN_MAX];
1937 uint64_t restart_ms;
1938
1939 if (link->network->can_restart_us == USEC_INFINITY)
1940 restart_ms = 0;
1941 else
1942 restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC);
1943
1944 format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC);
1945
1946 if (restart_ms > UINT32_MAX) {
1947 log_link_error(link, "restart timeout (%s) too big.", time_string);
1948 return -ERANGE;
1949 }
1950
1951 log_link_debug(link, "Setting restart = %s", time_string);
1952
1953 r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
1954 if (r < 0)
1955 return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
1956 }
1957
1958 r = sd_netlink_message_close_container(m);
1959 if (r < 0)
1960 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
1961
1962 r = sd_netlink_message_close_container(m);
1963 if (r < 0)
1964 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
1965
1966 r = sd_netlink_call_async(link->manager->rtnl, NULL, m, link_set_handler,
1967 link_netlink_destroy_callback, link, 0, __func__);
1968 if (r < 0)
1969 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1970
1971 link_ref(link);
1972
1973 if (!(link->flags & IFF_UP)) {
1974 r = link_up_can(link);
1975 if (r < 0) {
1976 link_enter_failed(link);
1977 return r;
1978 }
1979 }
1980
1981 log_link_debug(link, "link_set_can done");
1982
1983 return r;
1984 }
1985
1986 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1987 Link *link = userdata;
1988 int r;
1989
1990 assert(link);
1991
1992 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1993 return 1;
1994
1995 r = sd_netlink_message_get_errno(m);
1996 if (r < 0)
1997 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1998
1999 if (streq_ptr(link->kind, "can"))
2000 link_set_can(link);
2001
2002 return 1;
2003 }
2004
2005 int link_down(Link *link) {
2006 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2007 int r;
2008
2009 assert(link);
2010 assert(link->manager);
2011 assert(link->manager->rtnl);
2012
2013 log_link_debug(link, "Bringing link down");
2014
2015 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
2016 RTM_SETLINK, link->ifindex);
2017 if (r < 0)
2018 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2019
2020 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
2021 if (r < 0)
2022 return log_link_error_errno(link, r, "Could not set link flags: %m");
2023
2024 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, link_down_handler,
2025 link_netlink_destroy_callback, link, 0, __func__);
2026 if (r < 0)
2027 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2028
2029 link_ref(link);
2030
2031 return 0;
2032 }
2033
2034 static int link_handle_bound_to_list(Link *link) {
2035 Link *l;
2036 Iterator i;
2037 int r;
2038 bool required_up = false;
2039 bool link_is_up = false;
2040
2041 assert(link);
2042
2043 if (hashmap_isempty(link->bound_to_links))
2044 return 0;
2045
2046 if (link->flags & IFF_UP)
2047 link_is_up = true;
2048
2049 HASHMAP_FOREACH (l, link->bound_to_links, i)
2050 if (link_has_carrier(l)) {
2051 required_up = true;
2052 break;
2053 }
2054
2055 if (!required_up && link_is_up) {
2056 r = link_down(link);
2057 if (r < 0)
2058 return r;
2059 } else if (required_up && !link_is_up) {
2060 r = link_up(link);
2061 if (r < 0)
2062 return r;
2063 }
2064
2065 return 0;
2066 }
2067
2068 static int link_handle_bound_by_list(Link *link) {
2069 Iterator i;
2070 Link *l;
2071 int r;
2072
2073 assert(link);
2074
2075 if (hashmap_isempty(link->bound_by_links))
2076 return 0;
2077
2078 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2079 r = link_handle_bound_to_list(l);
2080 if (r < 0)
2081 return r;
2082 }
2083
2084 return 0;
2085 }
2086
2087 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2088 int r;
2089
2090 assert(link);
2091 assert(carrier);
2092
2093 if (link == carrier)
2094 return 0;
2095
2096 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2097 return 0;
2098
2099 r = hashmap_ensure_allocated(h, NULL);
2100 if (r < 0)
2101 return r;
2102
2103 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2104 if (r < 0)
2105 return r;
2106
2107 return 0;
2108 }
2109
2110 static int link_new_bound_by_list(Link *link) {
2111 Manager *m;
2112 Link *carrier;
2113 Iterator i;
2114 int r;
2115 bool list_updated = false;
2116
2117 assert(link);
2118 assert(link->manager);
2119
2120 m = link->manager;
2121
2122 HASHMAP_FOREACH(carrier, m->links, i) {
2123 if (!carrier->network)
2124 continue;
2125
2126 if (strv_isempty(carrier->network->bind_carrier))
2127 continue;
2128
2129 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2130 r = link_put_carrier(link, carrier, &link->bound_by_links);
2131 if (r < 0)
2132 return r;
2133
2134 list_updated = true;
2135 }
2136 }
2137
2138 if (list_updated)
2139 link_dirty(link);
2140
2141 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2142 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2143 if (r < 0)
2144 return r;
2145
2146 link_dirty(carrier);
2147 }
2148
2149 return 0;
2150 }
2151
2152 static int link_new_bound_to_list(Link *link) {
2153 Manager *m;
2154 Link *carrier;
2155 Iterator i;
2156 int r;
2157 bool list_updated = false;
2158
2159 assert(link);
2160 assert(link->manager);
2161
2162 if (!link->network)
2163 return 0;
2164
2165 if (strv_isempty(link->network->bind_carrier))
2166 return 0;
2167
2168 m = link->manager;
2169
2170 HASHMAP_FOREACH (carrier, m->links, i) {
2171 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2172 r = link_put_carrier(link, carrier, &link->bound_to_links);
2173 if (r < 0)
2174 return r;
2175
2176 list_updated = true;
2177 }
2178 }
2179
2180 if (list_updated)
2181 link_dirty(link);
2182
2183 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2184 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2185 if (r < 0)
2186 return r;
2187
2188 link_dirty(carrier);
2189 }
2190
2191 return 0;
2192 }
2193
2194 static int link_new_carrier_maps(Link *link) {
2195 int r;
2196
2197 r = link_new_bound_by_list(link);
2198 if (r < 0)
2199 return r;
2200
2201 r = link_handle_bound_by_list(link);
2202 if (r < 0)
2203 return r;
2204
2205 r = link_new_bound_to_list(link);
2206 if (r < 0)
2207 return r;
2208
2209 r = link_handle_bound_to_list(link);
2210 if (r < 0)
2211 return r;
2212
2213 return 0;
2214 }
2215
2216 static void link_free_bound_to_list(Link *link) {
2217 Link *bound_to;
2218 Iterator i;
2219
2220 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2221 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2222
2223 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2224 link_dirty(bound_to);
2225 }
2226
2227 return;
2228 }
2229
2230 static void link_free_bound_by_list(Link *link) {
2231 Link *bound_by;
2232 Iterator i;
2233
2234 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2235 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2236
2237 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2238 link_dirty(bound_by);
2239 link_handle_bound_to_list(bound_by);
2240 }
2241 }
2242
2243 return;
2244 }
2245
2246 static void link_free_carrier_maps(Link *link) {
2247 bool list_updated = false;
2248
2249 assert(link);
2250
2251 if (!hashmap_isempty(link->bound_to_links)) {
2252 link_free_bound_to_list(link);
2253 list_updated = true;
2254 }
2255
2256 if (!hashmap_isempty(link->bound_by_links)) {
2257 link_free_bound_by_list(link);
2258 list_updated = true;
2259 }
2260
2261 if (list_updated)
2262 link_dirty(link);
2263
2264 return;
2265 }
2266
2267 void link_drop(Link *link) {
2268 if (!link || link->state == LINK_STATE_LINGER)
2269 return;
2270
2271 link_set_state(link, LINK_STATE_LINGER);
2272
2273 link_free_carrier_maps(link);
2274
2275 log_link_debug(link, "Link removed");
2276
2277 (void) unlink(link->state_file);
2278
2279 link_detach_from_manager(link);
2280
2281 link_unref(link);
2282
2283 return;
2284 }
2285
2286 static int link_joined(Link *link) {
2287 int r;
2288
2289 assert(link);
2290 assert(link->network);
2291
2292 if (!hashmap_isempty(link->bound_to_links)) {
2293 r = link_handle_bound_to_list(link);
2294 if (r < 0)
2295 return r;
2296 } else if (!(link->flags & IFF_UP)) {
2297 r = link_up(link);
2298 if (r < 0) {
2299 link_enter_failed(link);
2300 return r;
2301 }
2302 }
2303
2304 if (link->network->bridge) {
2305 r = link_set_bridge(link);
2306 if (r < 0)
2307 log_link_error_errno(link, r, "Could not set bridge message: %m");
2308 }
2309
2310 if (link->network->bond) {
2311 r = link_bond_set(link);
2312 if (r < 0)
2313 log_link_error_errno(link, r, "Could not set bond message: %m");
2314 }
2315
2316 if (link->network->use_br_vlan &&
2317 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2318 r = link_set_bridge_vlan(link);
2319 if (r < 0)
2320 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2321 }
2322
2323 /* Skip setting up addresses until it gets carrier,
2324 or it would try to set addresses twice,
2325 which is bad for non-idempotent steps. */
2326 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2327 return 0;
2328
2329 return link_enter_set_addresses(link);
2330 }
2331
2332 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
2333 Link *link = userdata;
2334 int r;
2335
2336 assert(link);
2337 assert(link->network);
2338
2339 link->enslaving--;
2340
2341 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2342 return 1;
2343
2344 r = sd_netlink_message_get_errno(m);
2345 if (r < 0 && r != -EEXIST) {
2346 log_link_error_errno(link, r, "Could not join netdev: %m");
2347 link_enter_failed(link);
2348 return 1;
2349 } else
2350 log_link_debug(link, "Joined netdev");
2351
2352 if (link->enslaving <= 0)
2353 link_joined(link);
2354
2355 return 1;
2356 }
2357
2358 static int link_enter_join_netdev(Link *link) {
2359 NetDev *netdev;
2360 Iterator i;
2361 int r;
2362
2363 assert(link);
2364 assert(link->network);
2365 assert(link->state == LINK_STATE_PENDING);
2366
2367 link_set_state(link, LINK_STATE_ENSLAVING);
2368
2369 link_dirty(link);
2370
2371 if (!link->network->bridge &&
2372 !link->network->bond &&
2373 !link->network->vrf &&
2374 hashmap_isempty(link->network->stacked_netdevs))
2375 return link_joined(link);
2376
2377 if (link->network->bond) {
2378 if (link->network->bond->state == NETDEV_STATE_READY &&
2379 link->network->bond->ifindex == link->master_ifindex)
2380 return link_joined(link);
2381
2382 log_struct(LOG_DEBUG,
2383 LOG_LINK_INTERFACE(link),
2384 LOG_NETDEV_INTERFACE(link->network->bond),
2385 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2386
2387 r = netdev_join(link->network->bond, link, netdev_join_handler);
2388 if (r < 0) {
2389 log_struct_errno(LOG_WARNING, r,
2390 LOG_LINK_INTERFACE(link),
2391 LOG_NETDEV_INTERFACE(link->network->bond),
2392 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2393 link_enter_failed(link);
2394 return r;
2395 }
2396
2397 link->enslaving++;
2398 }
2399
2400 if (link->network->bridge) {
2401 log_struct(LOG_DEBUG,
2402 LOG_LINK_INTERFACE(link),
2403 LOG_NETDEV_INTERFACE(link->network->bridge),
2404 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2405
2406 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2407 if (r < 0) {
2408 log_struct_errno(LOG_WARNING, r,
2409 LOG_LINK_INTERFACE(link),
2410 LOG_NETDEV_INTERFACE(link->network->bridge),
2411 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2412 link_enter_failed(link);
2413 return r;
2414 }
2415
2416 link->enslaving++;
2417 }
2418
2419 if (link->network->vrf) {
2420 log_struct(LOG_DEBUG,
2421 LOG_LINK_INTERFACE(link),
2422 LOG_NETDEV_INTERFACE(link->network->vrf),
2423 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2424
2425 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2426 if (r < 0) {
2427 log_struct_errno(LOG_WARNING, r,
2428 LOG_LINK_INTERFACE(link),
2429 LOG_NETDEV_INTERFACE(link->network->vrf),
2430 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2431 link_enter_failed(link);
2432 return r;
2433 }
2434
2435 link->enslaving++;
2436 }
2437
2438 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2439
2440 if (netdev->ifindex > 0) {
2441 link_joined(link);
2442 continue;
2443 }
2444
2445 log_struct(LOG_DEBUG,
2446 LOG_LINK_INTERFACE(link),
2447 LOG_NETDEV_INTERFACE(netdev),
2448 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2449
2450 r = netdev_join(netdev, link, netdev_join_handler);
2451 if (r < 0) {
2452 log_struct_errno(LOG_WARNING, r,
2453 LOG_LINK_INTERFACE(link),
2454 LOG_NETDEV_INTERFACE(netdev),
2455 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2456 link_enter_failed(link);
2457 return r;
2458 }
2459
2460 link->enslaving++;
2461 }
2462
2463 return 0;
2464 }
2465
2466 static int link_set_ipv4_forward(Link *link) {
2467 int r;
2468
2469 if (!link_ipv4_forward_enabled(link))
2470 return 0;
2471
2472 /* We propagate the forwarding flag from one interface to the
2473 * global setting one way. This means: as long as at least one
2474 * interface was configured at any time that had IP forwarding
2475 * enabled the setting will stay on for good. We do this
2476 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2477 * somewhat in sync (see below). */
2478
2479 r = write_string_file("/proc/sys/net/ipv4/ip_forward", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2480 if (r < 0)
2481 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2482
2483 return 0;
2484 }
2485
2486 static int link_set_ipv6_forward(Link *link) {
2487 int r;
2488
2489 if (!link_ipv6_forward_enabled(link))
2490 return 0;
2491
2492 /* On Linux, the IPv6 stack does not know a per-interface
2493 * packet forwarding setting: either packet forwarding is on
2494 * for all, or off for all. We hence don't bother with a
2495 * per-interface setting, but simply propagate the interface
2496 * flag, if it is set, to the global flag, one-way. Note that
2497 * while IPv4 would allow a per-interface flag, we expose the
2498 * same behaviour there and also propagate the setting from
2499 * one to all, to keep things simple (see above). */
2500
2501 r = write_string_file("/proc/sys/net/ipv6/conf/all/forwarding", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2502 if (r < 0)
2503 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2504
2505 return 0;
2506 }
2507
2508 static int link_set_ipv6_privacy_extensions(Link *link) {
2509 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2510 IPv6PrivacyExtensions s;
2511 const char *p = NULL;
2512 int r;
2513
2514 s = link_ipv6_privacy_extensions(link);
2515 if (s < 0)
2516 return 0;
2517
2518 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/use_tempaddr");
2519 xsprintf(buf, "%u", (unsigned) link->network->ipv6_privacy_extensions);
2520
2521 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2522 if (r < 0)
2523 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2524
2525 return 0;
2526 }
2527
2528 static int link_set_ipv6_accept_ra(Link *link) {
2529 const char *p = NULL;
2530 int r;
2531
2532 /* Make this a NOP if IPv6 is not available */
2533 if (!socket_ipv6_is_supported())
2534 return 0;
2535
2536 if (link->flags & IFF_LOOPBACK)
2537 return 0;
2538
2539 if (!link->network)
2540 return 0;
2541
2542 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/accept_ra");
2543
2544 /* We handle router advertisements ourselves, tell the kernel to GTFO */
2545 r = write_string_file(p, "0", WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2546 if (r < 0)
2547 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2548
2549 return 0;
2550 }
2551
2552 static int link_set_ipv6_dad_transmits(Link *link) {
2553 char buf[DECIMAL_STR_MAX(int) + 1];
2554 const char *p = NULL;
2555 int r;
2556
2557 /* Make this a NOP if IPv6 is not available */
2558 if (!socket_ipv6_is_supported())
2559 return 0;
2560
2561 if (link->flags & IFF_LOOPBACK)
2562 return 0;
2563
2564 if (!link->network)
2565 return 0;
2566
2567 if (link->network->ipv6_dad_transmits < 0)
2568 return 0;
2569
2570 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/dad_transmits");
2571 xsprintf(buf, "%i", link->network->ipv6_dad_transmits);
2572
2573 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2574 if (r < 0)
2575 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2576
2577 return 0;
2578 }
2579
2580 static int link_set_ipv6_hop_limit(Link *link) {
2581 char buf[DECIMAL_STR_MAX(int) + 1];
2582 const char *p = NULL;
2583 int r;
2584
2585 /* Make this a NOP if IPv6 is not available */
2586 if (!socket_ipv6_is_supported())
2587 return 0;
2588
2589 if (link->flags & IFF_LOOPBACK)
2590 return 0;
2591
2592 if (!link->network)
2593 return 0;
2594
2595 if (link->network->ipv6_hop_limit < 0)
2596 return 0;
2597
2598 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/hop_limit");
2599 xsprintf(buf, "%i", link->network->ipv6_hop_limit);
2600
2601 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2602 if (r < 0)
2603 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2604
2605 return 0;
2606 }
2607
2608 static int link_set_ipv6_mtu(Link *link) {
2609 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2610 const char *p = NULL;
2611 int r;
2612
2613 /* Make this a NOP if IPv6 is not available */
2614 if (!socket_ipv6_is_supported())
2615 return 0;
2616
2617 if (link->flags & IFF_LOOPBACK)
2618 return 0;
2619
2620 if (link->network->ipv6_mtu == 0)
2621 return 0;
2622
2623 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/mtu");
2624
2625 xsprintf(buf, "%" PRIu32, link->network->ipv6_mtu);
2626
2627 r = write_string_file(p, buf, WRITE_STRING_FILE_DISABLE_BUFFER);
2628 if (r < 0)
2629 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2630
2631 return 0;
2632 }
2633
2634 static bool link_is_static_address_configured(Link *link, Address *address) {
2635 Address *net_address;
2636
2637 assert(link);
2638 assert(address);
2639
2640 if (!link->network)
2641 return false;
2642
2643 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2644 if (address_equal(net_address, address))
2645 return true;
2646
2647 return false;
2648 }
2649
2650 static bool link_is_static_route_configured(Link *link, Route *route) {
2651 Route *net_route;
2652
2653 assert(link);
2654 assert(route);
2655
2656 if (!link->network)
2657 return false;
2658
2659 LIST_FOREACH(routes, net_route, link->network->static_routes)
2660 if (route_equal(net_route, route))
2661 return true;
2662
2663 return false;
2664 }
2665
2666 static int link_drop_foreign_config(Link *link) {
2667 Address *address;
2668 Route *route;
2669 Iterator i;
2670 int r;
2671
2672 SET_FOREACH(address, link->addresses_foreign, i) {
2673 /* we consider IPv6LL addresses to be managed by the kernel */
2674 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2675 continue;
2676
2677 if (link_is_static_address_configured(link, address)) {
2678 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2679 if (r < 0)
2680 return log_link_error_errno(link, r, "Failed to add address: %m");
2681 } else {
2682 r = address_remove(address, link, link_address_remove_handler);
2683 if (r < 0)
2684 return r;
2685 }
2686 }
2687
2688 SET_FOREACH(route, link->routes_foreign, i) {
2689 /* do not touch routes managed by the kernel */
2690 if (route->protocol == RTPROT_KERNEL)
2691 continue;
2692
2693 if (link_is_static_route_configured(link, route)) {
2694 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2695 if (r < 0)
2696 return r;
2697 } else {
2698 r = route_remove(route, link, link_route_remove_handler);
2699 if (r < 0)
2700 return r;
2701 }
2702 }
2703
2704 return 0;
2705 }
2706
2707 static int link_drop_config(Link *link) {
2708 Address *address, *pool_address;
2709 Route *route;
2710 Iterator i;
2711 int r;
2712
2713 SET_FOREACH(address, link->addresses, i) {
2714 /* we consider IPv6LL addresses to be managed by the kernel */
2715 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2716 continue;
2717
2718 r = address_remove(address, link, link_address_remove_handler);
2719 if (r < 0)
2720 return r;
2721
2722 /* If this address came from an address pool, clean up the pool */
2723 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2724 if (address_equal(address, pool_address)) {
2725 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2726 address_free(pool_address);
2727 break;
2728 }
2729 }
2730 }
2731
2732 SET_FOREACH(route, link->routes, i) {
2733 /* do not touch routes managed by the kernel */
2734 if (route->protocol == RTPROT_KERNEL)
2735 continue;
2736
2737 r = route_remove(route, link, link_route_remove_handler);
2738 if (r < 0)
2739 return r;
2740 }
2741
2742 ndisc_flush(link);
2743
2744 return 0;
2745 }
2746
2747 static int link_update_lldp(Link *link) {
2748 int r;
2749
2750 assert(link);
2751
2752 if (!link->lldp)
2753 return 0;
2754
2755 if (link->flags & IFF_UP) {
2756 r = sd_lldp_start(link->lldp);
2757 if (r > 0)
2758 log_link_debug(link, "Started LLDP.");
2759 } else {
2760 r = sd_lldp_stop(link->lldp);
2761 if (r > 0)
2762 log_link_debug(link, "Stopped LLDP.");
2763 }
2764
2765 return r;
2766 }
2767
2768 static int link_configure_can(Link *link) {
2769 int r;
2770
2771 if (streq_ptr(link->kind, "can")) {
2772 /* The CAN interface must be down to configure bitrate, etc... */
2773 if ((link->flags & IFF_UP)) {
2774 r = link_down(link);
2775 if (r < 0) {
2776 link_enter_failed(link);
2777 return r;
2778 }
2779
2780 return 0;
2781 }
2782
2783 return link_set_can(link);
2784 }
2785
2786 if (!(link->flags & IFF_UP)) {
2787 r = link_up_can(link);
2788 if (r < 0) {
2789 link_enter_failed(link);
2790 return r;
2791 }
2792 }
2793
2794 return 0;
2795 }
2796
2797 static int link_configure(Link *link) {
2798 int r;
2799
2800 assert(link);
2801 assert(link->network);
2802 assert(link->state == LINK_STATE_PENDING);
2803
2804 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
2805 return link_configure_can(link);
2806
2807 /* Drop foreign config, but ignore loopback or critical devices.
2808 * We do not want to remove loopback address or addresses used for root NFS. */
2809 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2810 r = link_drop_foreign_config(link);
2811 if (r < 0)
2812 return r;
2813 }
2814
2815 r = link_set_proxy_arp(link);
2816 if (r < 0)
2817 return r;
2818
2819 r = ipv6_proxy_ndp_addresses_configure(link);
2820 if (r < 0)
2821 return r;
2822
2823 r = link_set_ipv4_forward(link);
2824 if (r < 0)
2825 return r;
2826
2827 r = link_set_ipv6_forward(link);
2828 if (r < 0)
2829 return r;
2830
2831 r = link_set_ipv6_privacy_extensions(link);
2832 if (r < 0)
2833 return r;
2834
2835 r = link_set_ipv6_accept_ra(link);
2836 if (r < 0)
2837 return r;
2838
2839 r = link_set_ipv6_dad_transmits(link);
2840 if (r < 0)
2841 return r;
2842
2843 r = link_set_ipv6_hop_limit(link);
2844 if (r < 0)
2845 return r;
2846
2847 r = link_set_flags(link);
2848 if (r < 0)
2849 return r;
2850
2851 r = link_set_ipv6_mtu(link);
2852 if (r < 0)
2853 return r;
2854
2855 if (link_ipv4ll_enabled(link)) {
2856 r = ipv4ll_configure(link);
2857 if (r < 0)
2858 return r;
2859 }
2860
2861 if (link_dhcp4_enabled(link)) {
2862 r = dhcp4_set_promote_secondaries(link);
2863 if (r < 0)
2864 return r;
2865
2866 r = dhcp4_configure(link);
2867 if (r < 0)
2868 return r;
2869 }
2870
2871 if (link_dhcp4_server_enabled(link)) {
2872 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2873 if (r < 0)
2874 return r;
2875
2876 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2877 if (r < 0)
2878 return r;
2879 }
2880
2881 if (link_dhcp6_enabled(link) ||
2882 link_ipv6_accept_ra_enabled(link)) {
2883 r = dhcp6_configure(link);
2884 if (r < 0)
2885 return r;
2886 }
2887
2888 if (link_ipv6_accept_ra_enabled(link)) {
2889 r = ndisc_configure(link);
2890 if (r < 0)
2891 return r;
2892 }
2893
2894 if (link_radv_enabled(link)) {
2895 r = radv_configure(link);
2896 if (r < 0)
2897 return r;
2898 }
2899
2900 if (link_lldp_rx_enabled(link)) {
2901 r = sd_lldp_new(&link->lldp);
2902 if (r < 0)
2903 return r;
2904
2905 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
2906 if (r < 0)
2907 return r;
2908
2909 r = sd_lldp_match_capabilities(link->lldp,
2910 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
2911 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
2912 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
2913 if (r < 0)
2914 return r;
2915
2916 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
2917 if (r < 0)
2918 return r;
2919
2920 r = sd_lldp_attach_event(link->lldp, NULL, 0);
2921 if (r < 0)
2922 return r;
2923
2924 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
2925 if (r < 0)
2926 return r;
2927
2928 r = link_update_lldp(link);
2929 if (r < 0)
2930 return r;
2931 }
2932
2933 if (link->network->mtu > 0) {
2934 r = link_set_mtu(link, link->network->mtu);
2935 if (r < 0)
2936 return r;
2937 }
2938
2939 return link_configure_after_setting_mtu(link);
2940 }
2941
2942 static int link_configure_after_setting_mtu(Link *link) {
2943 int r;
2944
2945 assert(link);
2946 assert(link->network);
2947 assert(link->state == LINK_STATE_PENDING);
2948
2949 if (link->setting_mtu)
2950 return 0;
2951
2952 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2953 r = link_acquire_conf(link);
2954 if (r < 0)
2955 return r;
2956 }
2957
2958 return link_enter_join_netdev(link);
2959 }
2960
2961 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
2962 assert(duid);
2963
2964 if (duid->raw_data_len > 0)
2965 return 0;
2966
2967 if (duid->type != DUID_TYPE_UUID)
2968 return -EINVAL;
2969
2970 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
2971 duid->raw_data_len = sizeof(sd_id128_t);
2972
2973 return 1;
2974 }
2975
2976 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
2977 Manager *manager = userdata;
2978 const sd_bus_error *e;
2979 const void *a;
2980 size_t sz;
2981 DUID *duid;
2982 Link *link;
2983 int r;
2984
2985 assert(m);
2986 assert(manager);
2987
2988 e = sd_bus_message_get_error(m);
2989 if (e) {
2990 log_error_errno(sd_bus_error_get_errno(e),
2991 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
2992 e->message);
2993 goto configure;
2994 }
2995
2996 r = sd_bus_message_read_array(m, 'y', &a, &sz);
2997 if (r < 0)
2998 goto configure;
2999
3000 if (sz != sizeof(sd_id128_t)) {
3001 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3002 goto configure;
3003 }
3004
3005 memcpy(&manager->product_uuid, a, sz);
3006 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3007 (void) duid_set_uuid(duid, manager->product_uuid);
3008
3009 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3010
3011 configure:
3012 while ((link = set_steal_first(manager->links_requesting_uuid))) {
3013 r = link_configure(link);
3014 if (r < 0)
3015 log_link_error_errno(link, r, "Failed to configure link: %m");
3016 }
3017
3018 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3019
3020 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3021 * even if the method fails. */
3022 manager->has_product_uuid = true;
3023
3024 return 1;
3025 }
3026
3027 static bool link_requires_uuid(Link *link) {
3028 const DUID *duid;
3029
3030 assert(link);
3031 assert(link->manager);
3032 assert(link->network);
3033
3034 duid = link_get_duid(link);
3035 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3036 return false;
3037
3038 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3039 return true;
3040
3041 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3042 return true;
3043
3044 return false;
3045 }
3046
3047 static int link_configure_duid(Link *link) {
3048 Manager *m;
3049 DUID *duid;
3050 int r;
3051
3052 assert(link);
3053 assert(link->manager);
3054 assert(link->network);
3055
3056 m = link->manager;
3057 duid = link_get_duid(link);
3058
3059 if (!link_requires_uuid(link))
3060 return 1;
3061
3062 if (m->has_product_uuid) {
3063 (void) duid_set_uuid(duid, m->product_uuid);
3064 return 1;
3065 }
3066
3067 if (!m->links_requesting_uuid) {
3068 r = manager_request_product_uuid(m, link);
3069 if (r < 0) {
3070 if (r == -ENOMEM)
3071 return r;
3072
3073 log_link_warning_errno(link, r,
3074 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3075 return 1;
3076 }
3077 } else {
3078 r = set_put(m->links_requesting_uuid, link);
3079 if (r < 0)
3080 return log_oom();
3081
3082 r = set_put(m->duids_requesting_uuid, duid);
3083 if (r < 0)
3084 return log_oom();
3085 }
3086
3087 return 0;
3088 }
3089
3090 static int link_initialized_and_synced(Link *link) {
3091 Network *network;
3092 int r;
3093
3094 assert(link);
3095 assert(link->ifname);
3096 assert(link->manager);
3097
3098 if (link->state != LINK_STATE_PENDING)
3099 return 1;
3100
3101 log_link_debug(link, "Link state is up-to-date");
3102
3103 r = link_new_bound_by_list(link);
3104 if (r < 0)
3105 return r;
3106
3107 r = link_handle_bound_by_list(link);
3108 if (r < 0)
3109 return r;
3110
3111 if (!link->network) {
3112 r = network_get(link->manager, link->sd_device, link->ifname,
3113 &link->mac, &network);
3114 if (r == -ENOENT) {
3115 link_enter_unmanaged(link);
3116 return 1;
3117 } else if (r == 0 && network->unmanaged) {
3118 link_enter_unmanaged(link);
3119 return 0;
3120 } else if (r < 0)
3121 return r;
3122
3123 if (link->flags & IFF_LOOPBACK) {
3124 if (network->link_local != ADDRESS_FAMILY_NO)
3125 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3126
3127 if (network->dhcp != ADDRESS_FAMILY_NO)
3128 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3129
3130 if (network->dhcp_server)
3131 log_link_debug(link, "Ignoring DHCP server for loopback link");
3132 }
3133
3134 r = network_apply(network, link);
3135 if (r < 0)
3136 return r;
3137 }
3138
3139 r = link_new_bound_to_list(link);
3140 if (r < 0)
3141 return r;
3142
3143 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3144 * link_configure() is called later asynchronously. */
3145 r = link_configure_duid(link);
3146 if (r <= 0)
3147 return r;
3148
3149 r = link_configure(link);
3150 if (r < 0)
3151 return r;
3152
3153 return 1;
3154 }
3155
3156 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
3157 (void) link_initialized_and_synced(userdata);
3158 return 1;
3159 }
3160
3161 int link_initialized(Link *link, sd_device *device) {
3162 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3163 int r;
3164
3165 assert(link);
3166 assert(link->manager);
3167 assert(link->manager->rtnl);
3168 assert(device);
3169
3170 if (link->state != LINK_STATE_PENDING)
3171 return 0;
3172
3173 if (link->sd_device)
3174 return 0;
3175
3176 log_link_debug(link, "udev initialized link");
3177
3178 link->sd_device = sd_device_ref(device);
3179
3180 /* udev has initialized the link, but we don't know if we have yet
3181 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3182 * when it returns we know that the pending NEWLINKs have already been
3183 * processed and that we are up-to-date */
3184
3185 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3186 link->ifindex);
3187 if (r < 0)
3188 return r;
3189
3190 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3191 link_netlink_destroy_callback, link, 0, __func__);
3192 if (r < 0)
3193 return r;
3194
3195 link_ref(link);
3196
3197 return 0;
3198 }
3199
3200 static int link_load(Link *link) {
3201 _cleanup_free_ char *network_file = NULL,
3202 *addresses = NULL,
3203 *routes = NULL,
3204 *dhcp4_address = NULL,
3205 *ipv4ll_address = NULL;
3206 union in_addr_union address;
3207 union in_addr_union route_dst;
3208 const char *p;
3209 int r;
3210
3211 assert(link);
3212
3213 r = parse_env_file(NULL, link->state_file,
3214 "NETWORK_FILE", &network_file,
3215 "ADDRESSES", &addresses,
3216 "ROUTES", &routes,
3217 "DHCP4_ADDRESS", &dhcp4_address,
3218 "IPV4LL_ADDRESS", &ipv4ll_address);
3219 if (r < 0 && r != -ENOENT)
3220 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3221
3222 if (network_file) {
3223 Network *network;
3224 char *suffix;
3225
3226 /* drop suffix */
3227 suffix = strrchr(network_file, '.');
3228 if (!suffix) {
3229 log_link_debug(link, "Failed to get network name from %s", network_file);
3230 goto network_file_fail;
3231 }
3232 *suffix = '\0';
3233
3234 r = network_get_by_name(link->manager, basename(network_file), &network);
3235 if (r < 0) {
3236 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3237 goto network_file_fail;
3238 }
3239
3240 r = network_apply(network, link);
3241 if (r < 0)
3242 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3243 }
3244
3245 network_file_fail:
3246
3247 if (addresses) {
3248 p = addresses;
3249
3250 for (;;) {
3251 _cleanup_free_ char *address_str = NULL;
3252 char *prefixlen_str;
3253 int family;
3254 unsigned char prefixlen;
3255
3256 r = extract_first_word(&p, &address_str, NULL, 0);
3257 if (r < 0) {
3258 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3259 continue;
3260 }
3261 if (r == 0)
3262 break;
3263
3264 prefixlen_str = strchr(address_str, '/');
3265 if (!prefixlen_str) {
3266 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3267 continue;
3268 }
3269
3270 *prefixlen_str++ = '\0';
3271
3272 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3273 if (r != 1) {
3274 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3275 continue;
3276 }
3277
3278 r = in_addr_from_string_auto(address_str, &family, &address);
3279 if (r < 0) {
3280 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3281 continue;
3282 }
3283
3284 r = address_add(link, family, &address, prefixlen, NULL);
3285 if (r < 0)
3286 return log_link_error_errno(link, r, "Failed to add address: %m");
3287 }
3288 }
3289
3290 if (routes) {
3291 p = routes;
3292
3293 for (;;) {
3294 Route *route;
3295 _cleanup_free_ char *route_str = NULL;
3296 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3297 usec_t lifetime;
3298 char *prefixlen_str;
3299 int family;
3300 unsigned char prefixlen, tos, table;
3301 uint32_t priority;
3302
3303 r = extract_first_word(&p, &route_str, NULL, 0);
3304 if (r < 0) {
3305 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3306 continue;
3307 }
3308 if (r == 0)
3309 break;
3310
3311 prefixlen_str = strchr(route_str, '/');
3312 if (!prefixlen_str) {
3313 log_link_debug(link, "Failed to parse route %s", route_str);
3314 continue;
3315 }
3316
3317 *prefixlen_str++ = '\0';
3318
3319 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3320 if (r != 5) {
3321 log_link_debug(link,
3322 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3323 prefixlen_str);
3324 continue;
3325 }
3326
3327 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3328 if (r < 0) {
3329 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3330 continue;
3331 }
3332
3333 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3334 if (r < 0)
3335 return log_link_error_errno(link, r, "Failed to add route: %m");
3336
3337 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3338 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3339 0, route_expire_handler, route);
3340 if (r < 0)
3341 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3342 }
3343
3344 route->lifetime = lifetime;
3345 sd_event_source_unref(route->expire);
3346 route->expire = TAKE_PTR(expire);
3347 }
3348 }
3349
3350 if (dhcp4_address) {
3351 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3352 if (r < 0) {
3353 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3354 goto dhcp4_address_fail;
3355 }
3356
3357 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3358 if (r < 0)
3359 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3360
3361 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3362 if (r < 0)
3363 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3364 }
3365
3366 dhcp4_address_fail:
3367
3368 if (ipv4ll_address) {
3369 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3370 if (r < 0) {
3371 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3372 goto ipv4ll_address_fail;
3373 }
3374
3375 r = sd_ipv4ll_new(&link->ipv4ll);
3376 if (r < 0)
3377 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3378
3379 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3380 if (r < 0)
3381 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3382 }
3383
3384 ipv4ll_address_fail:
3385
3386 return 0;
3387 }
3388
3389 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3390 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3391 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3392 Link *link;
3393 int r;
3394
3395 assert(m);
3396 assert(m->rtnl);
3397 assert(message);
3398 assert(ret);
3399
3400 r = link_new(m, message, ret);
3401 if (r < 0)
3402 return r;
3403
3404 link = *ret;
3405
3406 log_link_debug(link, "Link %d added", link->ifindex);
3407
3408 r = link_load(link);
3409 if (r < 0)
3410 return r;
3411
3412 if (detect_container() <= 0) {
3413 /* not in a container, udev will be around */
3414 sprintf(ifindex_str, "n%d", link->ifindex);
3415 r = sd_device_new_from_device_id(&device, ifindex_str);
3416 if (r < 0) {
3417 log_link_warning_errno(link, r, "Could not find device: %m");
3418 goto failed;
3419 }
3420
3421 r = sd_device_get_is_initialized(device);
3422 if (r < 0) {
3423 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3424 goto failed;
3425 }
3426 if (r == 0) {
3427 /* not yet ready */
3428 log_link_debug(link, "link pending udev initialization...");
3429 return 0;
3430 }
3431
3432 r = link_initialized(link, device);
3433 if (r < 0)
3434 goto failed;
3435 } else {
3436 r = link_initialized_and_synced(link);
3437 if (r < 0)
3438 goto failed;
3439 }
3440
3441 return 0;
3442 failed:
3443 link_enter_failed(link);
3444 return r;
3445 }
3446
3447 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3448 int r;
3449
3450 assert(link);
3451
3452 log_link_info(link, "Gained IPv6LL");
3453
3454 link->ipv6ll_address = *address;
3455 link_check_ready(link);
3456
3457 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3458 r = link_acquire_ipv6_conf(link);
3459 if (r < 0) {
3460 link_enter_failed(link);
3461 return r;
3462 }
3463 }
3464
3465 return 0;
3466 }
3467
3468 static int link_carrier_gained(Link *link) {
3469 int r;
3470
3471 assert(link);
3472
3473 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3474 r = link_acquire_conf(link);
3475 if (r < 0) {
3476 link_enter_failed(link);
3477 return r;
3478 }
3479
3480 r = link_enter_set_addresses(link);
3481 if (r < 0)
3482 return r;
3483 }
3484
3485 r = link_handle_bound_by_list(link);
3486 if (r < 0)
3487 return r;
3488
3489 return 0;
3490 }
3491
3492 static int link_carrier_lost(Link *link) {
3493 int r;
3494
3495 assert(link);
3496
3497 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3498 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3499 * configuration and stop the clients as well. */
3500 if (link->setting_mtu)
3501 return 0;
3502
3503 r = link_stop_clients(link);
3504 if (r < 0) {
3505 link_enter_failed(link);
3506 return r;
3507 }
3508
3509 if (link_dhcp4_server_enabled(link))
3510 (void) sd_dhcp_server_stop(link->dhcp_server);
3511
3512 r = link_drop_config(link);
3513 if (r < 0)
3514 return r;
3515
3516 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3517 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3518 r = link_drop_foreign_config(link);
3519 if (r < 0)
3520 return r;
3521 }
3522
3523 r = link_handle_bound_by_list(link);
3524 if (r < 0)
3525 return r;
3526
3527 return 0;
3528 }
3529
3530 int link_carrier_reset(Link *link) {
3531 int r;
3532
3533 assert(link);
3534
3535 if (link_has_carrier(link)) {
3536 r = link_carrier_lost(link);
3537 if (r < 0)
3538 return r;
3539
3540 r = link_carrier_gained(link);
3541 if (r < 0)
3542 return r;
3543
3544 log_link_info(link, "Reset carrier");
3545 }
3546
3547 return 0;
3548 }
3549
3550 int link_update(Link *link, sd_netlink_message *m) {
3551 struct ether_addr mac;
3552 const char *ifname;
3553 uint32_t mtu;
3554 bool had_carrier, carrier_gained, carrier_lost;
3555 int r;
3556
3557 assert(link);
3558 assert(link->ifname);
3559 assert(m);
3560
3561 if (link->state == LINK_STATE_LINGER) {
3562 log_link_info(link, "Link readded");
3563 link_set_state(link, LINK_STATE_ENSLAVING);
3564
3565 r = link_new_carrier_maps(link);
3566 if (r < 0)
3567 return r;
3568 }
3569
3570 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3571 if (r >= 0 && !streq(ifname, link->ifname)) {
3572 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3573
3574 if (link->state == LINK_STATE_PENDING) {
3575 r = free_and_strdup(&link->ifname, ifname);
3576 if (r < 0)
3577 return r;
3578 } else {
3579 Manager *manager = link->manager;
3580
3581 link_drop(link);
3582 r = link_add(manager, m, &link);
3583 if (r < 0)
3584 return r;
3585 }
3586 }
3587
3588 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3589 if (r >= 0 && mtu > 0) {
3590 link->mtu = mtu;
3591 if (link->original_mtu == 0) {
3592 link->original_mtu = mtu;
3593 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3594 }
3595
3596 if (link->dhcp_client) {
3597 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3598 link->mtu);
3599 if (r < 0)
3600 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3601 }
3602
3603 if (link->radv) {
3604 r = sd_radv_set_mtu(link->radv, link->mtu);
3605 if (r < 0)
3606 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3607 }
3608 }
3609
3610 /* The kernel may broadcast NEWLINK messages without the MAC address
3611 set, simply ignore them. */
3612 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3613 if (r >= 0) {
3614 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3615 ETH_ALEN)) {
3616
3617 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3618 ETH_ALEN);
3619
3620 log_link_debug(link, "MAC address: "
3621 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3622 mac.ether_addr_octet[0],
3623 mac.ether_addr_octet[1],
3624 mac.ether_addr_octet[2],
3625 mac.ether_addr_octet[3],
3626 mac.ether_addr_octet[4],
3627 mac.ether_addr_octet[5]);
3628
3629 if (link->ipv4ll) {
3630 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3631 if (r < 0)
3632 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3633 }
3634
3635 if (link->dhcp_client) {
3636 r = sd_dhcp_client_set_mac(link->dhcp_client,
3637 (const uint8_t *) &link->mac,
3638 sizeof (link->mac),
3639 ARPHRD_ETHER);
3640 if (r < 0)
3641 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3642
3643 r = dhcp4_set_client_identifier(link);
3644 if (r < 0)
3645 return r;
3646 }
3647
3648 if (link->dhcp6_client) {
3649 const DUID* duid = link_get_duid(link);
3650
3651 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3652 (const uint8_t *) &link->mac,
3653 sizeof (link->mac),
3654 ARPHRD_ETHER);
3655 if (r < 0)
3656 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3657
3658 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3659 link->network->iaid);
3660 if (r < 0)
3661 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3662
3663 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3664 duid->type,
3665 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3666 duid->raw_data_len);
3667 if (r < 0)
3668 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3669 }
3670
3671 if (link->radv) {
3672 r = sd_radv_set_mac(link->radv, &link->mac);
3673 if (r < 0)
3674 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3675 }
3676
3677 if (link->ndisc) {
3678 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3679 if (r < 0)
3680 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3681 }
3682 }
3683 }
3684
3685 had_carrier = link_has_carrier(link);
3686
3687 r = link_update_flags(link, m);
3688 if (r < 0)
3689 return r;
3690
3691 r = link_update_lldp(link);
3692 if (r < 0)
3693 return r;
3694
3695 carrier_gained = !had_carrier && link_has_carrier(link);
3696 carrier_lost = had_carrier && !link_has_carrier(link);
3697
3698 if (carrier_gained) {
3699 log_link_info(link, "Gained carrier");
3700
3701 r = link_carrier_gained(link);
3702 if (r < 0)
3703 return r;
3704 } else if (carrier_lost) {
3705 log_link_info(link, "Lost carrier");
3706
3707 r = link_carrier_lost(link);
3708 if (r < 0)
3709 return r;
3710 }
3711
3712 return 0;
3713 }
3714
3715 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3716 bool space = false;
3717 Iterator i;
3718 Link *link;
3719
3720 assert(f);
3721 assert(prefix);
3722
3723 if (hashmap_isempty(h))
3724 return;
3725
3726 fputs(prefix, f);
3727 HASHMAP_FOREACH(link, h, i) {
3728 if (space)
3729 fputc(' ', f);
3730
3731 fprintf(f, "%i", link->ifindex);
3732 space = true;
3733 }
3734
3735 fputc('\n', f);
3736 }
3737
3738 int link_save(Link *link) {
3739 _cleanup_free_ char *temp_path = NULL;
3740 _cleanup_fclose_ FILE *f = NULL;
3741 const char *admin_state, *oper_state;
3742 Address *a;
3743 Route *route;
3744 Iterator i;
3745 int r;
3746
3747 assert(link);
3748 assert(link->state_file);
3749 assert(link->lease_file);
3750 assert(link->manager);
3751
3752 if (link->state == LINK_STATE_LINGER) {
3753 unlink(link->state_file);
3754 return 0;
3755 }
3756
3757 link_lldp_save(link);
3758
3759 admin_state = link_state_to_string(link->state);
3760 assert(admin_state);
3761
3762 oper_state = link_operstate_to_string(link->operstate);
3763 assert(oper_state);
3764
3765 r = fopen_temporary(link->state_file, &f, &temp_path);
3766 if (r < 0)
3767 goto fail;
3768
3769 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
3770 (void) fchmod(fileno(f), 0644);
3771
3772 fprintf(f,
3773 "# This is private data. Do not parse.\n"
3774 "ADMIN_STATE=%s\n"
3775 "OPER_STATE=%s\n",
3776 admin_state, oper_state);
3777
3778 if (link->network) {
3779 bool space;
3780 sd_dhcp6_lease *dhcp6_lease = NULL;
3781 const char *dhcp_domainname = NULL;
3782 char **dhcp6_domains = NULL;
3783 char **dhcp_domains = NULL;
3784 unsigned j;
3785
3786 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3787 yes_no(link->network->required_for_online));
3788
3789 if (link->dhcp6_client) {
3790 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3791 if (r < 0 && r != -ENOMSG)
3792 log_link_debug(link, "No DHCPv6 lease");
3793 }
3794
3795 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3796
3797 fputs("DNS=", f);
3798 space = false;
3799
3800 for (j = 0; j < link->network->n_dns; j++) {
3801 _cleanup_free_ char *b = NULL;
3802
3803 r = in_addr_to_string(link->network->dns[j].family,
3804 &link->network->dns[j].address, &b);
3805 if (r < 0) {
3806 log_debug_errno(r, "Failed to format address, ignoring: %m");
3807 continue;
3808 }
3809
3810 if (space)
3811 fputc(' ', f);
3812 fputs(b, f);
3813 space = true;
3814 }
3815
3816 if (link->network->dhcp_use_dns &&
3817 link->dhcp_lease) {
3818 const struct in_addr *addresses;
3819
3820 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3821 if (r > 0) {
3822 if (space)
3823 fputc(' ', f);
3824 serialize_in_addrs(f, addresses, r);
3825 space = true;
3826 }
3827 }
3828
3829 if (link->network->dhcp_use_dns && dhcp6_lease) {
3830 struct in6_addr *in6_addrs;
3831
3832 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3833 if (r > 0) {
3834 if (space)
3835 fputc(' ', f);
3836 serialize_in6_addrs(f, in6_addrs, r);
3837 space = true;
3838 }
3839 }
3840
3841 /* Make sure to flush out old entries before we use the NDISC data */
3842 ndisc_vacuum(link);
3843
3844 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3845 NDiscRDNSS *dd;
3846
3847 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3848 if (space)
3849 fputc(' ', f);
3850
3851 serialize_in6_addrs(f, &dd->address, 1);
3852 space = true;
3853 }
3854 }
3855
3856 fputc('\n', f);
3857
3858 fputs("NTP=", f);
3859 space = false;
3860 fputstrv(f, link->network->ntp, NULL, &space);
3861
3862 if (link->network->dhcp_use_ntp &&
3863 link->dhcp_lease) {
3864 const struct in_addr *addresses;
3865
3866 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3867 if (r > 0) {
3868 if (space)
3869 fputc(' ', f);
3870 serialize_in_addrs(f, addresses, r);
3871 space = true;
3872 }
3873 }
3874
3875 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3876 struct in6_addr *in6_addrs;
3877 char **hosts;
3878
3879 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3880 &in6_addrs);
3881 if (r > 0) {
3882 if (space)
3883 fputc(' ', f);
3884 serialize_in6_addrs(f, in6_addrs, r);
3885 space = true;
3886 }
3887
3888 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3889 if (r > 0)
3890 fputstrv(f, hosts, NULL, &space);
3891 }
3892
3893 fputc('\n', f);
3894
3895 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3896 if (link->dhcp_lease) {
3897 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3898 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3899 }
3900 if (dhcp6_lease)
3901 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3902 }
3903
3904 fputs("DOMAINS=", f);
3905 space = false;
3906 fputstrv(f, link->network->search_domains, NULL, &space);
3907
3908 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3909 NDiscDNSSL *dd;
3910
3911 if (dhcp_domainname)
3912 fputs_with_space(f, dhcp_domainname, NULL, &space);
3913 if (dhcp_domains)
3914 fputstrv(f, dhcp_domains, NULL, &space);
3915 if (dhcp6_domains)
3916 fputstrv(f, dhcp6_domains, NULL, &space);
3917
3918 SET_FOREACH(dd, link->ndisc_dnssl, i)
3919 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3920 }
3921
3922 fputc('\n', f);
3923
3924 fputs("ROUTE_DOMAINS=", f);
3925 space = false;
3926 fputstrv(f, link->network->route_domains, NULL, &space);
3927
3928 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3929 NDiscDNSSL *dd;
3930
3931 if (dhcp_domainname)
3932 fputs_with_space(f, dhcp_domainname, NULL, &space);
3933 if (dhcp_domains)
3934 fputstrv(f, dhcp_domains, NULL, &space);
3935 if (dhcp6_domains)
3936 fputstrv(f, dhcp6_domains, NULL, &space);
3937
3938 SET_FOREACH(dd, link->ndisc_dnssl, i)
3939 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3940 }
3941
3942 fputc('\n', f);
3943
3944 fprintf(f, "LLMNR=%s\n",
3945 resolve_support_to_string(link->network->llmnr));
3946 fprintf(f, "MDNS=%s\n",
3947 resolve_support_to_string(link->network->mdns));
3948
3949 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3950 fprintf(f, "DNS_OVER_TLS=%s\n",
3951 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
3952
3953 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3954 fprintf(f, "DNSSEC=%s\n",
3955 dnssec_mode_to_string(link->network->dnssec_mode));
3956
3957 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3958 const char *n;
3959
3960 fputs("DNSSEC_NTA=", f);
3961 space = false;
3962 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3963 fputs_with_space(f, n, NULL, &space);
3964 fputc('\n', f);
3965 }
3966
3967 fputs("ADDRESSES=", f);
3968 space = false;
3969 SET_FOREACH(a, link->addresses, i) {
3970 _cleanup_free_ char *address_str = NULL;
3971
3972 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3973 if (r < 0)
3974 goto fail;
3975
3976 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3977 space = true;
3978 }
3979 fputc('\n', f);
3980
3981 fputs("ROUTES=", f);
3982 space = false;
3983 SET_FOREACH(route, link->routes, i) {
3984 _cleanup_free_ char *route_str = NULL;
3985
3986 r = in_addr_to_string(route->family, &route->dst, &route_str);
3987 if (r < 0)
3988 goto fail;
3989
3990 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
3991 space ? " " : "", route_str,
3992 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3993 space = true;
3994 }
3995
3996 fputc('\n', f);
3997 }
3998
3999 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4000 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4001
4002 if (link->dhcp_lease) {
4003 struct in_addr address;
4004 const char *tz = NULL;
4005
4006 assert(link->network);
4007
4008 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
4009 if (r >= 0)
4010 fprintf(f, "TIMEZONE=%s\n", tz);
4011
4012 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
4013 if (r >= 0) {
4014 fputs("DHCP4_ADDRESS=", f);
4015 serialize_in_addrs(f, &address, 1);
4016 fputc('\n', f);
4017 }
4018
4019 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4020 if (r < 0)
4021 goto fail;
4022
4023 fprintf(f,
4024 "DHCP_LEASE=%s\n",
4025 link->lease_file);
4026 } else
4027 unlink(link->lease_file);
4028
4029 if (link->ipv4ll) {
4030 struct in_addr address;
4031
4032 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4033 if (r >= 0) {
4034 fputs("IPV4LL_ADDRESS=", f);
4035 serialize_in_addrs(f, &address, 1);
4036 fputc('\n', f);
4037 }
4038 }
4039
4040 r = fflush_and_check(f);
4041 if (r < 0)
4042 goto fail;
4043
4044 if (rename(temp_path, link->state_file) < 0) {
4045 r = -errno;
4046 goto fail;
4047 }
4048
4049 return 0;
4050
4051 fail:
4052 (void) unlink(link->state_file);
4053 if (temp_path)
4054 (void) unlink(temp_path);
4055
4056 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4057 }
4058
4059 /* The serialized state in /run is no longer up-to-date. */
4060 void link_dirty(Link *link) {
4061 int r;
4062
4063 assert(link);
4064
4065 /* mark manager dirty as link is dirty */
4066 manager_dirty(link->manager);
4067
4068 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
4069 if (r < 0)
4070 /* allocation errors are ignored */
4071 return;
4072
4073 r = set_put(link->manager->dirty_links, link);
4074 if (r <= 0)
4075 /* don't take another ref if the link was already dirty */
4076 return;
4077
4078 link_ref(link);
4079 }
4080
4081 /* The serialized state in /run is up-to-date */
4082 void link_clean(Link *link) {
4083 assert(link);
4084 assert(link->manager);
4085
4086 link_unref(set_remove(link->manager->dirty_links, link));
4087 }
4088
4089 static const char* const link_state_table[_LINK_STATE_MAX] = {
4090 [LINK_STATE_PENDING] = "pending",
4091 [LINK_STATE_ENSLAVING] = "configuring",
4092 [LINK_STATE_SETTING_ADDRESSES] = "configuring",
4093 [LINK_STATE_SETTING_ROUTES] = "configuring",
4094 [LINK_STATE_CONFIGURED] = "configured",
4095 [LINK_STATE_UNMANAGED] = "unmanaged",
4096 [LINK_STATE_FAILED] = "failed",
4097 [LINK_STATE_LINGER] = "linger",
4098 };
4099
4100 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
4101
4102 static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
4103 [LINK_OPERSTATE_OFF] = "off",
4104 [LINK_OPERSTATE_NO_CARRIER] = "no-carrier",
4105 [LINK_OPERSTATE_DORMANT] = "dormant",
4106 [LINK_OPERSTATE_CARRIER] = "carrier",
4107 [LINK_OPERSTATE_DEGRADED] = "degraded",
4108 [LINK_OPERSTATE_ROUTABLE] = "routable",
4109 };
4110
4111 DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
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