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network: move address_label_handler() to networkd-address-label.c
[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,
798 rule->protocol, &rule->sport, &rule->dport, &rrule);
799 if (r == 0) {
800 (void) routing_policy_rule_make_local(link->manager, rrule);
801 continue;
802 }
803
804 r = routing_policy_rule_configure(rule, link, link_routing_policy_rule_handler, false);
805 if (r < 0) {
806 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
807 link_enter_failed(link);
808 return r;
809 }
810
811 link->routing_policy_rule_messages++;
812 }
813
814 routing_policy_rule_purge(link->manager, link);
815 if (link->routing_policy_rule_messages == 0) {
816 link->routing_policy_rules_configured = true;
817 link_check_ready(link);
818 } else
819 log_link_debug(link, "Setting routing policy rules");
820
821 return 0;
822 }
823
824 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
825 Link *link = userdata;
826 int r;
827
828 assert(link);
829 assert(link->route_messages > 0);
830 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
831 LINK_STATE_SETTING_ROUTES, LINK_STATE_FAILED,
832 LINK_STATE_LINGER));
833
834 link->route_messages--;
835
836 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
837 return 1;
838
839 r = sd_netlink_message_get_errno(m);
840 if (r < 0 && r != -EEXIST)
841 log_link_warning_errno(link, r, "Could not set route: %m");
842
843 if (link->route_messages == 0) {
844 log_link_debug(link, "Routes set");
845 link->static_routes_configured = true;
846 link_check_ready(link);
847 }
848
849 return 1;
850 }
851
852 static int link_enter_set_routes(Link *link) {
853 enum {
854 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
855 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
856 _PHASE_MAX
857 } phase;
858 Route *rt;
859 int r;
860
861 assert(link);
862 assert(link->network);
863 assert(link->state == LINK_STATE_SETTING_ADDRESSES);
864
865 (void) link_set_routing_policy_rule(link);
866
867 link_set_state(link, LINK_STATE_SETTING_ROUTES);
868
869 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
870 for (phase = 0; phase < _PHASE_MAX; phase++)
871 LIST_FOREACH(routes, rt, link->network->static_routes) {
872
873 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
874 continue;
875
876 r = route_configure(rt, link, route_handler);
877 if (r < 0) {
878 log_link_warning_errno(link, r, "Could not set routes: %m");
879 link_enter_failed(link);
880 return r;
881 }
882
883 link->route_messages++;
884 }
885
886 if (link->route_messages == 0) {
887 link->static_routes_configured = true;
888 link_check_ready(link);
889 } else
890 log_link_debug(link, "Setting routes");
891
892 return 0;
893 }
894
895 int link_route_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
896 Link *link = userdata;
897 int r;
898
899 assert(m);
900 assert(link);
901 assert(link->ifname);
902
903 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
904 return 1;
905
906 r = sd_netlink_message_get_errno(m);
907 if (r < 0 && r != -ESRCH)
908 log_link_warning_errno(link, r, "Could not drop route: %m");
909
910 return 1;
911 }
912
913 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
914 Link *link = userdata;
915 int r;
916
917 assert(rtnl);
918 assert(m);
919 assert(link);
920 assert(link->ifname);
921 assert(link->address_messages > 0);
922 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
923 LINK_STATE_FAILED, LINK_STATE_LINGER));
924
925 link->address_messages--;
926
927 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
928 return 1;
929
930 r = sd_netlink_message_get_errno(m);
931 if (r < 0 && r != -EEXIST)
932 log_link_warning_errno(link, r, "could not set address: %m");
933 else if (r >= 0)
934 manager_rtnl_process_address(rtnl, m, link->manager);
935
936 if (link->address_messages == 0) {
937 log_link_debug(link, "Addresses set");
938 link_enter_set_routes(link);
939 }
940
941 return 1;
942 }
943
944 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
945 _cleanup_free_ struct in_addr *addresses = NULL;
946 size_t n_addresses = 0, n_allocated = 0;
947 unsigned i;
948
949 log_debug("Copying DNS server information from %s", link->ifname);
950
951 if (!link->network)
952 return 0;
953
954 for (i = 0; i < link->network->n_dns; i++) {
955 struct in_addr ia;
956
957 /* Only look for IPv4 addresses */
958 if (link->network->dns[i].family != AF_INET)
959 continue;
960
961 ia = link->network->dns[i].address.in;
962
963 /* Never propagate obviously borked data */
964 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
965 continue;
966
967 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
968 return log_oom();
969
970 addresses[n_addresses++] = ia;
971 }
972
973 if (link->network->dhcp_use_dns && link->dhcp_lease) {
974 const struct in_addr *da = NULL;
975 int n;
976
977 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
978 if (n > 0) {
979
980 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
981 return log_oom();
982
983 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
984 n_addresses += n;
985 }
986 }
987
988 if (n_addresses <= 0)
989 return 0;
990
991 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
992 }
993
994 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
995 _cleanup_free_ struct in_addr *addresses = NULL;
996 size_t n_addresses = 0, n_allocated = 0;
997 char **a;
998
999 if (!link->network)
1000 return 0;
1001
1002 log_debug("Copying NTP server information from %s", link->ifname);
1003
1004 STRV_FOREACH(a, link->network->ntp) {
1005 struct in_addr ia;
1006
1007 /* Only look for IPv4 addresses */
1008 if (inet_pton(AF_INET, *a, &ia) <= 0)
1009 continue;
1010
1011 /* Never propagate obviously borked data */
1012 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1013 continue;
1014
1015 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1016 return log_oom();
1017
1018 addresses[n_addresses++] = ia;
1019 }
1020
1021 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1022 const struct in_addr *da = NULL;
1023 int n;
1024
1025 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1026 if (n > 0) {
1027
1028 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1029 return log_oom();
1030
1031 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
1032 n_addresses += n;
1033 }
1034 }
1035
1036 if (n_addresses <= 0)
1037 return 0;
1038
1039 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1040 }
1041
1042 static int link_set_bridge_fdb(Link *link) {
1043 FdbEntry *fdb_entry;
1044 int r;
1045
1046 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1047 r = fdb_entry_configure(link, fdb_entry);
1048 if (r < 0)
1049 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1050 }
1051
1052 return 0;
1053 }
1054
1055 static int link_enter_set_addresses(Link *link) {
1056 AddressLabel *label;
1057 Address *ad;
1058 int r;
1059
1060 assert(link);
1061 assert(link->network);
1062 assert(link->state != _LINK_STATE_INVALID);
1063
1064 r = link_set_bridge_fdb(link);
1065 if (r < 0)
1066 return r;
1067
1068 link_set_state(link, LINK_STATE_SETTING_ADDRESSES);
1069
1070 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1071 r = address_configure(ad, link, address_handler, false);
1072 if (r < 0) {
1073 log_link_warning_errno(link, r, "Could not set addresses: %m");
1074 link_enter_failed(link);
1075 return r;
1076 }
1077
1078 link->address_messages++;
1079 }
1080
1081 LIST_FOREACH(labels, label, link->network->address_labels) {
1082 r = address_label_configure(label, link, NULL, false);
1083 if (r < 0) {
1084 log_link_warning_errno(link, r, "Could not set address label: %m");
1085 link_enter_failed(link);
1086 return r;
1087 }
1088
1089 link->address_label_messages++;
1090 }
1091
1092 /* now that we can figure out a default address for the dhcp server,
1093 start it */
1094 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1095 Address *address;
1096 Link *uplink = NULL;
1097 bool acquired_uplink = false;
1098
1099 address = link_find_dhcp_server_address(link);
1100 if (!address) {
1101 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1102 link_enter_failed(link);
1103 return 0;
1104 }
1105
1106 /* use the server address' subnet as the pool */
1107 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1108 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1109 if (r < 0)
1110 return r;
1111
1112 /* TODO:
1113 r = sd_dhcp_server_set_router(link->dhcp_server,
1114 &main_address->in_addr.in);
1115 if (r < 0)
1116 return r;
1117 */
1118
1119 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1120 r = sd_dhcp_server_set_max_lease_time(
1121 link->dhcp_server,
1122 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1123 if (r < 0)
1124 return r;
1125 }
1126
1127 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1128 r = sd_dhcp_server_set_default_lease_time(
1129 link->dhcp_server,
1130 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1131 if (r < 0)
1132 return r;
1133 }
1134
1135 if (link->network->dhcp_server_emit_dns) {
1136
1137 if (link->network->n_dhcp_server_dns > 0)
1138 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1139 else {
1140 uplink = manager_find_uplink(link->manager, link);
1141 acquired_uplink = true;
1142
1143 if (!uplink) {
1144 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1145 r = 0;
1146 } else
1147 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1148 }
1149 if (r < 0)
1150 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1151 }
1152
1153 if (link->network->dhcp_server_emit_ntp) {
1154
1155 if (link->network->n_dhcp_server_ntp > 0)
1156 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1157 else {
1158 if (!acquired_uplink)
1159 uplink = manager_find_uplink(link->manager, link);
1160
1161 if (!uplink) {
1162 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1163 r = 0;
1164 } else
1165 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1166
1167 }
1168 if (r < 0)
1169 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1170 }
1171
1172 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1173 if (r < 0)
1174 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1175
1176 if (link->network->dhcp_server_emit_timezone) {
1177 _cleanup_free_ char *buffer = NULL;
1178 const char *tz = NULL;
1179
1180 if (link->network->dhcp_server_timezone)
1181 tz = link->network->dhcp_server_timezone;
1182 else {
1183 r = get_timezone(&buffer);
1184 if (r < 0)
1185 log_warning_errno(r, "Failed to determine timezone: %m");
1186 else
1187 tz = buffer;
1188 }
1189
1190 if (tz) {
1191 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1192 if (r < 0)
1193 return r;
1194 }
1195 }
1196
1197 r = sd_dhcp_server_start(link->dhcp_server);
1198 if (r < 0) {
1199 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1200
1201 link_enter_failed(link);
1202
1203 return 0;
1204 }
1205
1206 log_link_debug(link, "Offering DHCPv4 leases");
1207 }
1208
1209 if (link->address_messages == 0)
1210 link_enter_set_routes(link);
1211 else
1212 log_link_debug(link, "Setting addresses");
1213
1214 return 0;
1215 }
1216
1217 int link_address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1218 Link *link = userdata;
1219 int r;
1220
1221 assert(m);
1222 assert(link);
1223 assert(link->ifname);
1224
1225 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1226 return 1;
1227
1228 r = sd_netlink_message_get_errno(m);
1229 if (r < 0 && r != -EADDRNOTAVAIL)
1230 log_link_warning_errno(link, r, "Could not drop address: %m");
1231
1232 return 1;
1233 }
1234
1235 static int link_set_bridge_vlan(Link *link) {
1236 int r = 0;
1237
1238 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1239 if (r < 0)
1240 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1241
1242 return r;
1243 }
1244
1245 static int link_set_proxy_arp(Link *link) {
1246 const char *p = NULL;
1247 int r;
1248
1249 if (!link_proxy_arp_enabled(link))
1250 return 0;
1251
1252 p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/proxy_arp");
1253
1254 r = write_string_file(p, one_zero(link->network->proxy_arp), WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
1255 if (r < 0)
1256 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1257
1258 return 0;
1259 }
1260
1261 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1262 Link *link = userdata;
1263 int r;
1264
1265 assert(link);
1266
1267 log_link_debug(link, "Set link");
1268
1269 r = sd_netlink_message_get_errno(m);
1270 if (r < 0 && r != -EEXIST) {
1271 log_link_error_errno(link, r, "Could not join netdev: %m");
1272 link_enter_failed(link);
1273 }
1274
1275 return 1;
1276 }
1277
1278 static int link_configure_after_setting_mtu(Link *link);
1279
1280 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1281 Link *link = userdata;
1282 int r;
1283
1284 assert(m);
1285 assert(link);
1286 assert(link->ifname);
1287
1288 link->setting_mtu = false;
1289
1290 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1291 return 1;
1292
1293 r = sd_netlink_message_get_errno(m);
1294 if (r < 0) {
1295 log_link_warning_errno(link, r, "Could not set MTU: %m");
1296 return 1;
1297 }
1298
1299 log_link_debug(link, "Setting MTU done.");
1300
1301 if (link->state == LINK_STATE_PENDING)
1302 (void) link_configure_after_setting_mtu(link);
1303
1304 return 1;
1305 }
1306
1307 int link_set_mtu(Link *link, uint32_t mtu) {
1308 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1309 int r;
1310
1311 assert(link);
1312 assert(link->manager);
1313 assert(link->manager->rtnl);
1314
1315 if (link->mtu == mtu || link->setting_mtu)
1316 return 0;
1317
1318 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1319
1320 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1321 if (r < 0)
1322 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1323
1324 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1325 * for this interface, or if it is a bridge slave, then disable IPv6 else enable it. */
1326 (void) link_enable_ipv6(link);
1327
1328 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1329 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1330 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1331
1332 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1333 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1334
1335 mtu = IPV6_MIN_MTU;
1336 }
1337
1338 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1339 if (r < 0)
1340 return log_link_error_errno(link, r, "Could not append MTU: %m");
1341
1342 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1343 link_netlink_destroy_callback, link, 0, __func__);
1344 if (r < 0)
1345 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1346
1347 link_ref(link);
1348 link->setting_mtu = true;
1349
1350 return 0;
1351 }
1352
1353 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1354 Link *link = userdata;
1355 int r;
1356
1357 assert(m);
1358 assert(link);
1359 assert(link->ifname);
1360
1361 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1362 return 1;
1363
1364 r = sd_netlink_message_get_errno(m);
1365 if (r < 0)
1366 log_link_warning_errno(link, r, "Could not set link flags: %m");
1367
1368 return 1;
1369 }
1370
1371 static int link_set_flags(Link *link) {
1372 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1373 unsigned ifi_change = 0;
1374 unsigned ifi_flags = 0;
1375 int r;
1376
1377 assert(link);
1378 assert(link->manager);
1379 assert(link->manager->rtnl);
1380
1381 if (link->flags & IFF_LOOPBACK)
1382 return 0;
1383
1384 if (!link->network)
1385 return 0;
1386
1387 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1388 return 0;
1389
1390 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1391 if (r < 0)
1392 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1393
1394 if (link->network->arp >= 0) {
1395 ifi_change |= IFF_NOARP;
1396 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1397 }
1398
1399 if (link->network->multicast >= 0) {
1400 ifi_change |= IFF_MULTICAST;
1401 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1402 }
1403
1404 if (link->network->allmulticast >= 0) {
1405 ifi_change |= IFF_ALLMULTI;
1406 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1407 }
1408
1409 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1410 if (r < 0)
1411 return log_link_error_errno(link, r, "Could not set link flags: %m");
1412
1413 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1414 link_netlink_destroy_callback, link, 0, __func__);
1415 if (r < 0)
1416 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1417
1418 link_ref(link);
1419
1420 return 0;
1421 }
1422
1423 static int link_set_bridge(Link *link) {
1424 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1425 int r;
1426
1427 assert(link);
1428 assert(link->network);
1429
1430 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1431 if (r < 0)
1432 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1433
1434 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1435 if (r < 0)
1436 return log_link_error_errno(link, r, "Could not set message family: %m");
1437
1438 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1439 if (r < 0)
1440 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1441
1442 if (link->network->use_bpdu >= 0) {
1443 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
1444 if (r < 0)
1445 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1446 }
1447
1448 if (link->network->hairpin >= 0) {
1449 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1450 if (r < 0)
1451 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1452 }
1453
1454 if (link->network->fast_leave >= 0) {
1455 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1456 if (r < 0)
1457 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1458 }
1459
1460 if (link->network->allow_port_to_be_root >= 0) {
1461 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
1462 if (r < 0)
1463 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1464
1465 }
1466
1467 if (link->network->unicast_flood >= 0) {
1468 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1469 if (r < 0)
1470 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1471
1472 }
1473
1474 if (link->network->cost != 0) {
1475 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1476 if (r < 0)
1477 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1478 }
1479 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1480 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1481 if (r < 0)
1482 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1483 }
1484
1485 r = sd_netlink_message_close_container(req);
1486 if (r < 0)
1487 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1488
1489 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, link_set_handler,
1490 link_netlink_destroy_callback, link, 0, __func__);
1491 if (r < 0)
1492 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1493
1494 link_ref(link);
1495
1496 return r;
1497 }
1498
1499 static int link_bond_set(Link *link) {
1500 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1501 int r;
1502
1503 assert(link);
1504 assert(link->network);
1505
1506 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1507 if (r < 0)
1508 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1509
1510 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1511 if (r < 0)
1512 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1513
1514 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1515 if (r < 0)
1516 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1517
1518 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1519 if (r < 0)
1520 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1521
1522 if (link->network->active_slave) {
1523 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1524 if (r < 0)
1525 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1526 }
1527
1528 if (link->network->primary_slave) {
1529 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1530 if (r < 0)
1531 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1532 }
1533
1534 r = sd_netlink_message_close_container(req);
1535 if (r < 0)
1536 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1537
1538 r = sd_netlink_message_close_container(req);
1539 if (r < 0)
1540 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1541
1542 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1543 link_netlink_destroy_callback, link, 0, __func__);
1544 if (r < 0)
1545 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1546
1547 link_ref(link);
1548
1549 return r;
1550 }
1551
1552 static int link_lldp_save(Link *link) {
1553 _cleanup_free_ char *temp_path = NULL;
1554 _cleanup_fclose_ FILE *f = NULL;
1555 sd_lldp_neighbor **l = NULL;
1556 int n = 0, r, i;
1557
1558 assert(link);
1559 assert(link->lldp_file);
1560
1561 if (!link->lldp) {
1562 (void) unlink(link->lldp_file);
1563 return 0;
1564 }
1565
1566 r = sd_lldp_get_neighbors(link->lldp, &l);
1567 if (r < 0)
1568 goto finish;
1569 if (r == 0) {
1570 (void) unlink(link->lldp_file);
1571 goto finish;
1572 }
1573
1574 n = r;
1575
1576 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1577 if (r < 0)
1578 goto finish;
1579
1580 fchmod(fileno(f), 0644);
1581
1582 for (i = 0; i < n; i++) {
1583 const void *p;
1584 le64_t u;
1585 size_t sz;
1586
1587 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1588 if (r < 0)
1589 goto finish;
1590
1591 u = htole64(sz);
1592 (void) fwrite(&u, 1, sizeof(u), f);
1593 (void) fwrite(p, 1, sz, f);
1594 }
1595
1596 r = fflush_and_check(f);
1597 if (r < 0)
1598 goto finish;
1599
1600 if (rename(temp_path, link->lldp_file) < 0) {
1601 r = -errno;
1602 goto finish;
1603 }
1604
1605 finish:
1606 if (r < 0) {
1607 (void) unlink(link->lldp_file);
1608 if (temp_path)
1609 (void) unlink(temp_path);
1610
1611 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1612 }
1613
1614 if (l) {
1615 for (i = 0; i < n; i++)
1616 sd_lldp_neighbor_unref(l[i]);
1617 free(l);
1618 }
1619
1620 return r;
1621 }
1622
1623 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1624 Link *link = userdata;
1625 int r;
1626
1627 assert(link);
1628
1629 (void) link_lldp_save(link);
1630
1631 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1632 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1633
1634 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1635
1636 r = link_lldp_emit_start(link);
1637 if (r < 0)
1638 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1639 }
1640 }
1641
1642 static int link_acquire_ipv6_conf(Link *link) {
1643 int r;
1644
1645 assert(link);
1646
1647 if (link_ipv6_accept_ra_enabled(link)) {
1648 assert(link->ndisc);
1649
1650 log_link_debug(link, "Discovering IPv6 routers");
1651
1652 r = sd_ndisc_start(link->ndisc);
1653 if (r < 0 && r != -EBUSY)
1654 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1655 }
1656
1657 if (link_radv_enabled(link)) {
1658 assert(link->radv);
1659 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1660
1661 log_link_debug(link, "Starting IPv6 Router Advertisements");
1662
1663 r = sd_radv_start(link->radv);
1664 if (r < 0 && r != -EBUSY)
1665 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1666 }
1667
1668 (void) dhcp6_request_prefix_delegation(link);
1669
1670 return 0;
1671 }
1672
1673 static int link_acquire_ipv4_conf(Link *link) {
1674 int r;
1675
1676 assert(link);
1677 assert(link->network);
1678 assert(link->manager);
1679 assert(link->manager->event);
1680
1681 if (link_ipv4ll_enabled(link)) {
1682 assert(link->ipv4ll);
1683
1684 log_link_debug(link, "Acquiring IPv4 link-local address");
1685
1686 r = sd_ipv4ll_start(link->ipv4ll);
1687 if (r < 0)
1688 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1689 }
1690
1691 if (link_dhcp4_enabled(link)) {
1692 assert(link->dhcp_client);
1693
1694 log_link_debug(link, "Acquiring DHCPv4 lease");
1695
1696 r = sd_dhcp_client_start(link->dhcp_client);
1697 if (r < 0)
1698 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1699 }
1700
1701 return 0;
1702 }
1703
1704 static int link_acquire_conf(Link *link) {
1705 int r;
1706
1707 assert(link);
1708
1709 r = link_acquire_ipv4_conf(link);
1710 if (r < 0)
1711 return r;
1712
1713 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) == 0) {
1714 r = link_acquire_ipv6_conf(link);
1715 if (r < 0)
1716 return r;
1717 }
1718
1719 if (link_lldp_emit_enabled(link)) {
1720 r = link_lldp_emit_start(link);
1721 if (r < 0)
1722 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1723 }
1724
1725 return 0;
1726 }
1727
1728 bool link_has_carrier(Link *link) {
1729 /* see Documentation/networking/operstates.txt in the kernel sources */
1730
1731 if (link->kernel_operstate == IF_OPER_UP)
1732 return true;
1733
1734 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1735 /* operstate may not be implemented, so fall back to flags */
1736 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1737 return true;
1738
1739 return false;
1740 }
1741
1742 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1743 Link *link = userdata;
1744 int r;
1745
1746 assert(link);
1747
1748 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1749 return 1;
1750
1751 r = sd_netlink_message_get_errno(m);
1752 if (r < 0)
1753 /* we warn but don't fail the link, as it may be brought up later */
1754 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1755
1756 return 1;
1757 }
1758
1759 int link_up(Link *link) {
1760 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1761 uint8_t ipv6ll_mode;
1762 int r;
1763
1764 assert(link);
1765 assert(link->network);
1766 assert(link->manager);
1767 assert(link->manager->rtnl);
1768
1769 log_link_debug(link, "Bringing link up");
1770
1771 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1772 if (r < 0)
1773 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1774
1775 /* set it free if not enslaved with networkd */
1776 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1777 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1778 if (r < 0)
1779 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1780 }
1781
1782 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1783 if (r < 0)
1784 return log_link_error_errno(link, r, "Could not set link flags: %m");
1785
1786 if (link->network->mac) {
1787 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1788 if (r < 0)
1789 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1790 }
1791
1792 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1793 if (r < 0)
1794 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1795
1796 if (link_ipv6_enabled(link)) {
1797 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
1798 r = sd_netlink_message_open_container(req, AF_INET6);
1799 if (r < 0)
1800 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1801
1802 if (!link_ipv6ll_enabled(link))
1803 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1804 else {
1805 const char *p = NULL;
1806 _cleanup_free_ char *stable_secret = NULL;
1807
1808 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/stable_secret");
1809 r = read_one_line_file(p, &stable_secret);
1810
1811 if (r < 0)
1812 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1813 else
1814 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1815 }
1816 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1817 if (r < 0)
1818 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1819
1820 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
1821 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
1822 if (r < 0)
1823 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
1824 }
1825
1826 r = sd_netlink_message_close_container(req);
1827 if (r < 0)
1828 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1829 }
1830
1831 r = sd_netlink_message_close_container(req);
1832 if (r < 0)
1833 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1834
1835 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1836 link_netlink_destroy_callback, link, 0, __func__);
1837 if (r < 0)
1838 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1839
1840 link_ref(link);
1841
1842 return 0;
1843 }
1844
1845 static int link_up_can(Link *link) {
1846 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1847 int r;
1848
1849 assert(link);
1850
1851 log_link_debug(link, "Bringing CAN link up");
1852
1853 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1854 if (r < 0)
1855 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1856
1857 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1858 if (r < 0)
1859 return log_link_error_errno(link, r, "Could not set link flags: %m");
1860
1861 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1862 link_netlink_destroy_callback, link, 0, __func__);
1863 if (r < 0)
1864 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1865
1866 link_ref(link);
1867
1868 return 0;
1869 }
1870
1871 static int link_set_can(Link *link) {
1872 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
1873 int r;
1874
1875 assert(link);
1876 assert(link->network);
1877 assert(link->manager);
1878 assert(link->manager->rtnl);
1879
1880 log_link_debug(link, "link_set_can");
1881
1882 r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
1883 if (r < 0)
1884 return log_link_error_errno(link, r, "Failed to allocate netlink message: %m");
1885
1886 r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
1887 if (r < 0)
1888 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1889
1890 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
1891 if (r < 0)
1892 return log_link_error_errno(link, r, "Failed to open netlink container: %m");
1893
1894 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
1895 if (r < 0)
1896 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1897
1898 if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) {
1899 struct can_bittiming bt = {
1900 .bitrate = link->network->can_bitrate,
1901 .sample_point = link->network->can_sample_point,
1902 };
1903
1904 if (link->network->can_bitrate > UINT32_MAX) {
1905 log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate);
1906 return -ERANGE;
1907 }
1908
1909 log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate);
1910 if (link->network->can_sample_point > 0)
1911 log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
1912 else
1913 log_link_debug(link, "Using default sample point");
1914
1915 r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
1916 if (r < 0)
1917 return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
1918 }
1919
1920 if (link->network->can_restart_us > 0) {
1921 char time_string[FORMAT_TIMESPAN_MAX];
1922 uint64_t restart_ms;
1923
1924 if (link->network->can_restart_us == USEC_INFINITY)
1925 restart_ms = 0;
1926 else
1927 restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC);
1928
1929 format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC);
1930
1931 if (restart_ms > UINT32_MAX) {
1932 log_link_error(link, "restart timeout (%s) too big.", time_string);
1933 return -ERANGE;
1934 }
1935
1936 log_link_debug(link, "Setting restart = %s", time_string);
1937
1938 r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
1939 if (r < 0)
1940 return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
1941 }
1942
1943 r = sd_netlink_message_close_container(m);
1944 if (r < 0)
1945 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
1946
1947 r = sd_netlink_message_close_container(m);
1948 if (r < 0)
1949 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
1950
1951 r = sd_netlink_call_async(link->manager->rtnl, NULL, m, link_set_handler,
1952 link_netlink_destroy_callback, link, 0, __func__);
1953 if (r < 0)
1954 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1955
1956 link_ref(link);
1957
1958 if (!(link->flags & IFF_UP)) {
1959 r = link_up_can(link);
1960 if (r < 0) {
1961 link_enter_failed(link);
1962 return r;
1963 }
1964 }
1965
1966 log_link_debug(link, "link_set_can done");
1967
1968 return r;
1969 }
1970
1971 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1972 Link *link = userdata;
1973 int r;
1974
1975 assert(link);
1976
1977 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1978 return 1;
1979
1980 r = sd_netlink_message_get_errno(m);
1981 if (r < 0)
1982 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1983
1984 if (streq_ptr(link->kind, "can"))
1985 link_set_can(link);
1986
1987 return 1;
1988 }
1989
1990 int link_down(Link *link) {
1991 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1992 int r;
1993
1994 assert(link);
1995 assert(link->manager);
1996 assert(link->manager->rtnl);
1997
1998 log_link_debug(link, "Bringing link down");
1999
2000 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
2001 RTM_SETLINK, link->ifindex);
2002 if (r < 0)
2003 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2004
2005 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
2006 if (r < 0)
2007 return log_link_error_errno(link, r, "Could not set link flags: %m");
2008
2009 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, link_down_handler,
2010 link_netlink_destroy_callback, link, 0, __func__);
2011 if (r < 0)
2012 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2013
2014 link_ref(link);
2015
2016 return 0;
2017 }
2018
2019 static int link_handle_bound_to_list(Link *link) {
2020 Link *l;
2021 Iterator i;
2022 int r;
2023 bool required_up = false;
2024 bool link_is_up = false;
2025
2026 assert(link);
2027
2028 if (hashmap_isempty(link->bound_to_links))
2029 return 0;
2030
2031 if (link->flags & IFF_UP)
2032 link_is_up = true;
2033
2034 HASHMAP_FOREACH (l, link->bound_to_links, i)
2035 if (link_has_carrier(l)) {
2036 required_up = true;
2037 break;
2038 }
2039
2040 if (!required_up && link_is_up) {
2041 r = link_down(link);
2042 if (r < 0)
2043 return r;
2044 } else if (required_up && !link_is_up) {
2045 r = link_up(link);
2046 if (r < 0)
2047 return r;
2048 }
2049
2050 return 0;
2051 }
2052
2053 static int link_handle_bound_by_list(Link *link) {
2054 Iterator i;
2055 Link *l;
2056 int r;
2057
2058 assert(link);
2059
2060 if (hashmap_isempty(link->bound_by_links))
2061 return 0;
2062
2063 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2064 r = link_handle_bound_to_list(l);
2065 if (r < 0)
2066 return r;
2067 }
2068
2069 return 0;
2070 }
2071
2072 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2073 int r;
2074
2075 assert(link);
2076 assert(carrier);
2077
2078 if (link == carrier)
2079 return 0;
2080
2081 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2082 return 0;
2083
2084 r = hashmap_ensure_allocated(h, NULL);
2085 if (r < 0)
2086 return r;
2087
2088 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2089 if (r < 0)
2090 return r;
2091
2092 return 0;
2093 }
2094
2095 static int link_new_bound_by_list(Link *link) {
2096 Manager *m;
2097 Link *carrier;
2098 Iterator i;
2099 int r;
2100 bool list_updated = false;
2101
2102 assert(link);
2103 assert(link->manager);
2104
2105 m = link->manager;
2106
2107 HASHMAP_FOREACH(carrier, m->links, i) {
2108 if (!carrier->network)
2109 continue;
2110
2111 if (strv_isempty(carrier->network->bind_carrier))
2112 continue;
2113
2114 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2115 r = link_put_carrier(link, carrier, &link->bound_by_links);
2116 if (r < 0)
2117 return r;
2118
2119 list_updated = true;
2120 }
2121 }
2122
2123 if (list_updated)
2124 link_dirty(link);
2125
2126 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2127 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2128 if (r < 0)
2129 return r;
2130
2131 link_dirty(carrier);
2132 }
2133
2134 return 0;
2135 }
2136
2137 static int link_new_bound_to_list(Link *link) {
2138 Manager *m;
2139 Link *carrier;
2140 Iterator i;
2141 int r;
2142 bool list_updated = false;
2143
2144 assert(link);
2145 assert(link->manager);
2146
2147 if (!link->network)
2148 return 0;
2149
2150 if (strv_isempty(link->network->bind_carrier))
2151 return 0;
2152
2153 m = link->manager;
2154
2155 HASHMAP_FOREACH (carrier, m->links, i) {
2156 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2157 r = link_put_carrier(link, carrier, &link->bound_to_links);
2158 if (r < 0)
2159 return r;
2160
2161 list_updated = true;
2162 }
2163 }
2164
2165 if (list_updated)
2166 link_dirty(link);
2167
2168 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2169 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2170 if (r < 0)
2171 return r;
2172
2173 link_dirty(carrier);
2174 }
2175
2176 return 0;
2177 }
2178
2179 static int link_new_carrier_maps(Link *link) {
2180 int r;
2181
2182 r = link_new_bound_by_list(link);
2183 if (r < 0)
2184 return r;
2185
2186 r = link_handle_bound_by_list(link);
2187 if (r < 0)
2188 return r;
2189
2190 r = link_new_bound_to_list(link);
2191 if (r < 0)
2192 return r;
2193
2194 r = link_handle_bound_to_list(link);
2195 if (r < 0)
2196 return r;
2197
2198 return 0;
2199 }
2200
2201 static void link_free_bound_to_list(Link *link) {
2202 Link *bound_to;
2203 Iterator i;
2204
2205 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2206 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2207
2208 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2209 link_dirty(bound_to);
2210 }
2211
2212 return;
2213 }
2214
2215 static void link_free_bound_by_list(Link *link) {
2216 Link *bound_by;
2217 Iterator i;
2218
2219 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2220 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2221
2222 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2223 link_dirty(bound_by);
2224 link_handle_bound_to_list(bound_by);
2225 }
2226 }
2227
2228 return;
2229 }
2230
2231 static void link_free_carrier_maps(Link *link) {
2232 bool list_updated = false;
2233
2234 assert(link);
2235
2236 if (!hashmap_isempty(link->bound_to_links)) {
2237 link_free_bound_to_list(link);
2238 list_updated = true;
2239 }
2240
2241 if (!hashmap_isempty(link->bound_by_links)) {
2242 link_free_bound_by_list(link);
2243 list_updated = true;
2244 }
2245
2246 if (list_updated)
2247 link_dirty(link);
2248
2249 return;
2250 }
2251
2252 void link_drop(Link *link) {
2253 if (!link || link->state == LINK_STATE_LINGER)
2254 return;
2255
2256 link_set_state(link, LINK_STATE_LINGER);
2257
2258 link_free_carrier_maps(link);
2259
2260 log_link_debug(link, "Link removed");
2261
2262 (void) unlink(link->state_file);
2263
2264 link_detach_from_manager(link);
2265
2266 link_unref(link);
2267
2268 return;
2269 }
2270
2271 static int link_joined(Link *link) {
2272 int r;
2273
2274 assert(link);
2275 assert(link->network);
2276
2277 if (!hashmap_isempty(link->bound_to_links)) {
2278 r = link_handle_bound_to_list(link);
2279 if (r < 0)
2280 return r;
2281 } else if (!(link->flags & IFF_UP)) {
2282 r = link_up(link);
2283 if (r < 0) {
2284 link_enter_failed(link);
2285 return r;
2286 }
2287 }
2288
2289 if (link->network->bridge) {
2290 r = link_set_bridge(link);
2291 if (r < 0)
2292 log_link_error_errno(link, r, "Could not set bridge message: %m");
2293 }
2294
2295 if (link->network->bond) {
2296 r = link_bond_set(link);
2297 if (r < 0)
2298 log_link_error_errno(link, r, "Could not set bond message: %m");
2299 }
2300
2301 if (link->network->use_br_vlan &&
2302 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2303 r = link_set_bridge_vlan(link);
2304 if (r < 0)
2305 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2306 }
2307
2308 /* Skip setting up addresses until it gets carrier,
2309 or it would try to set addresses twice,
2310 which is bad for non-idempotent steps. */
2311 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2312 return 0;
2313
2314 return link_enter_set_addresses(link);
2315 }
2316
2317 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
2318 Link *link = userdata;
2319 int r;
2320
2321 assert(link);
2322 assert(link->network);
2323
2324 link->enslaving--;
2325
2326 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2327 return 1;
2328
2329 r = sd_netlink_message_get_errno(m);
2330 if (r < 0 && r != -EEXIST) {
2331 log_link_error_errno(link, r, "Could not join netdev: %m");
2332 link_enter_failed(link);
2333 return 1;
2334 } else
2335 log_link_debug(link, "Joined netdev");
2336
2337 if (link->enslaving <= 0)
2338 link_joined(link);
2339
2340 return 1;
2341 }
2342
2343 static int link_enter_join_netdev(Link *link) {
2344 NetDev *netdev;
2345 Iterator i;
2346 int r;
2347
2348 assert(link);
2349 assert(link->network);
2350 assert(link->state == LINK_STATE_PENDING);
2351
2352 link_set_state(link, LINK_STATE_ENSLAVING);
2353
2354 link_dirty(link);
2355
2356 if (!link->network->bridge &&
2357 !link->network->bond &&
2358 !link->network->vrf &&
2359 hashmap_isempty(link->network->stacked_netdevs))
2360 return link_joined(link);
2361
2362 if (link->network->bond) {
2363 if (link->network->bond->state == NETDEV_STATE_READY &&
2364 link->network->bond->ifindex == link->master_ifindex)
2365 return link_joined(link);
2366
2367 log_struct(LOG_DEBUG,
2368 LOG_LINK_INTERFACE(link),
2369 LOG_NETDEV_INTERFACE(link->network->bond),
2370 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2371
2372 r = netdev_join(link->network->bond, link, netdev_join_handler);
2373 if (r < 0) {
2374 log_struct_errno(LOG_WARNING, r,
2375 LOG_LINK_INTERFACE(link),
2376 LOG_NETDEV_INTERFACE(link->network->bond),
2377 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2378 link_enter_failed(link);
2379 return r;
2380 }
2381
2382 link->enslaving++;
2383 }
2384
2385 if (link->network->bridge) {
2386 log_struct(LOG_DEBUG,
2387 LOG_LINK_INTERFACE(link),
2388 LOG_NETDEV_INTERFACE(link->network->bridge),
2389 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2390
2391 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2392 if (r < 0) {
2393 log_struct_errno(LOG_WARNING, r,
2394 LOG_LINK_INTERFACE(link),
2395 LOG_NETDEV_INTERFACE(link->network->bridge),
2396 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2397 link_enter_failed(link);
2398 return r;
2399 }
2400
2401 link->enslaving++;
2402 }
2403
2404 if (link->network->vrf) {
2405 log_struct(LOG_DEBUG,
2406 LOG_LINK_INTERFACE(link),
2407 LOG_NETDEV_INTERFACE(link->network->vrf),
2408 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2409
2410 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2411 if (r < 0) {
2412 log_struct_errno(LOG_WARNING, r,
2413 LOG_LINK_INTERFACE(link),
2414 LOG_NETDEV_INTERFACE(link->network->vrf),
2415 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2416 link_enter_failed(link);
2417 return r;
2418 }
2419
2420 link->enslaving++;
2421 }
2422
2423 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2424
2425 if (netdev->ifindex > 0) {
2426 link_joined(link);
2427 continue;
2428 }
2429
2430 log_struct(LOG_DEBUG,
2431 LOG_LINK_INTERFACE(link),
2432 LOG_NETDEV_INTERFACE(netdev),
2433 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2434
2435 r = netdev_join(netdev, link, netdev_join_handler);
2436 if (r < 0) {
2437 log_struct_errno(LOG_WARNING, r,
2438 LOG_LINK_INTERFACE(link),
2439 LOG_NETDEV_INTERFACE(netdev),
2440 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2441 link_enter_failed(link);
2442 return r;
2443 }
2444
2445 link->enslaving++;
2446 }
2447
2448 return 0;
2449 }
2450
2451 static int link_set_ipv4_forward(Link *link) {
2452 int r;
2453
2454 if (!link_ipv4_forward_enabled(link))
2455 return 0;
2456
2457 /* We propagate the forwarding flag from one interface to the
2458 * global setting one way. This means: as long as at least one
2459 * interface was configured at any time that had IP forwarding
2460 * enabled the setting will stay on for good. We do this
2461 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2462 * somewhat in sync (see below). */
2463
2464 r = write_string_file("/proc/sys/net/ipv4/ip_forward", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2465 if (r < 0)
2466 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2467
2468 return 0;
2469 }
2470
2471 static int link_set_ipv6_forward(Link *link) {
2472 int r;
2473
2474 if (!link_ipv6_forward_enabled(link))
2475 return 0;
2476
2477 /* On Linux, the IPv6 stack does not know a per-interface
2478 * packet forwarding setting: either packet forwarding is on
2479 * for all, or off for all. We hence don't bother with a
2480 * per-interface setting, but simply propagate the interface
2481 * flag, if it is set, to the global flag, one-way. Note that
2482 * while IPv4 would allow a per-interface flag, we expose the
2483 * same behaviour there and also propagate the setting from
2484 * one to all, to keep things simple (see above). */
2485
2486 r = write_string_file("/proc/sys/net/ipv6/conf/all/forwarding", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2487 if (r < 0)
2488 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2489
2490 return 0;
2491 }
2492
2493 static int link_set_ipv6_privacy_extensions(Link *link) {
2494 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2495 IPv6PrivacyExtensions s;
2496 const char *p = NULL;
2497 int r;
2498
2499 s = link_ipv6_privacy_extensions(link);
2500 if (s < 0)
2501 return 0;
2502
2503 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/use_tempaddr");
2504 xsprintf(buf, "%u", (unsigned) link->network->ipv6_privacy_extensions);
2505
2506 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2507 if (r < 0)
2508 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2509
2510 return 0;
2511 }
2512
2513 static int link_set_ipv6_accept_ra(Link *link) {
2514 const char *p = NULL;
2515 int r;
2516
2517 /* Make this a NOP if IPv6 is not available */
2518 if (!socket_ipv6_is_supported())
2519 return 0;
2520
2521 if (link->flags & IFF_LOOPBACK)
2522 return 0;
2523
2524 if (!link->network)
2525 return 0;
2526
2527 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/accept_ra");
2528
2529 /* We handle router advertisements ourselves, tell the kernel to GTFO */
2530 r = write_string_file(p, "0", WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2531 if (r < 0)
2532 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2533
2534 return 0;
2535 }
2536
2537 static int link_set_ipv6_dad_transmits(Link *link) {
2538 char buf[DECIMAL_STR_MAX(int) + 1];
2539 const char *p = NULL;
2540 int r;
2541
2542 /* Make this a NOP if IPv6 is not available */
2543 if (!socket_ipv6_is_supported())
2544 return 0;
2545
2546 if (link->flags & IFF_LOOPBACK)
2547 return 0;
2548
2549 if (!link->network)
2550 return 0;
2551
2552 if (link->network->ipv6_dad_transmits < 0)
2553 return 0;
2554
2555 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/dad_transmits");
2556 xsprintf(buf, "%i", link->network->ipv6_dad_transmits);
2557
2558 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2559 if (r < 0)
2560 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2561
2562 return 0;
2563 }
2564
2565 static int link_set_ipv6_hop_limit(Link *link) {
2566 char buf[DECIMAL_STR_MAX(int) + 1];
2567 const char *p = NULL;
2568 int r;
2569
2570 /* Make this a NOP if IPv6 is not available */
2571 if (!socket_ipv6_is_supported())
2572 return 0;
2573
2574 if (link->flags & IFF_LOOPBACK)
2575 return 0;
2576
2577 if (!link->network)
2578 return 0;
2579
2580 if (link->network->ipv6_hop_limit < 0)
2581 return 0;
2582
2583 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/hop_limit");
2584 xsprintf(buf, "%i", link->network->ipv6_hop_limit);
2585
2586 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2587 if (r < 0)
2588 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2589
2590 return 0;
2591 }
2592
2593 static int link_set_ipv6_mtu(Link *link) {
2594 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2595 const char *p = NULL;
2596 int r;
2597
2598 /* Make this a NOP if IPv6 is not available */
2599 if (!socket_ipv6_is_supported())
2600 return 0;
2601
2602 if (link->flags & IFF_LOOPBACK)
2603 return 0;
2604
2605 if (link->network->ipv6_mtu == 0)
2606 return 0;
2607
2608 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/mtu");
2609
2610 xsprintf(buf, "%" PRIu32, link->network->ipv6_mtu);
2611
2612 r = write_string_file(p, buf, WRITE_STRING_FILE_DISABLE_BUFFER);
2613 if (r < 0)
2614 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2615
2616 return 0;
2617 }
2618
2619 static bool link_is_static_address_configured(Link *link, Address *address) {
2620 Address *net_address;
2621
2622 assert(link);
2623 assert(address);
2624
2625 if (!link->network)
2626 return false;
2627
2628 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2629 if (address_equal(net_address, address))
2630 return true;
2631
2632 return false;
2633 }
2634
2635 static bool link_is_static_route_configured(Link *link, Route *route) {
2636 Route *net_route;
2637
2638 assert(link);
2639 assert(route);
2640
2641 if (!link->network)
2642 return false;
2643
2644 LIST_FOREACH(routes, net_route, link->network->static_routes)
2645 if (route_equal(net_route, route))
2646 return true;
2647
2648 return false;
2649 }
2650
2651 static int link_drop_foreign_config(Link *link) {
2652 Address *address;
2653 Route *route;
2654 Iterator i;
2655 int r;
2656
2657 SET_FOREACH(address, link->addresses_foreign, i) {
2658 /* we consider IPv6LL addresses to be managed by the kernel */
2659 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2660 continue;
2661
2662 if (link_is_static_address_configured(link, address)) {
2663 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2664 if (r < 0)
2665 return log_link_error_errno(link, r, "Failed to add address: %m");
2666 } else {
2667 r = address_remove(address, link, link_address_remove_handler);
2668 if (r < 0)
2669 return r;
2670 }
2671 }
2672
2673 SET_FOREACH(route, link->routes_foreign, i) {
2674 /* do not touch routes managed by the kernel */
2675 if (route->protocol == RTPROT_KERNEL)
2676 continue;
2677
2678 if (link_is_static_route_configured(link, route)) {
2679 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2680 if (r < 0)
2681 return r;
2682 } else {
2683 r = route_remove(route, link, link_route_remove_handler);
2684 if (r < 0)
2685 return r;
2686 }
2687 }
2688
2689 return 0;
2690 }
2691
2692 static int link_drop_config(Link *link) {
2693 Address *address, *pool_address;
2694 Route *route;
2695 Iterator i;
2696 int r;
2697
2698 SET_FOREACH(address, link->addresses, i) {
2699 /* we consider IPv6LL addresses to be managed by the kernel */
2700 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2701 continue;
2702
2703 r = address_remove(address, link, link_address_remove_handler);
2704 if (r < 0)
2705 return r;
2706
2707 /* If this address came from an address pool, clean up the pool */
2708 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2709 if (address_equal(address, pool_address)) {
2710 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2711 address_free(pool_address);
2712 break;
2713 }
2714 }
2715 }
2716
2717 SET_FOREACH(route, link->routes, i) {
2718 /* do not touch routes managed by the kernel */
2719 if (route->protocol == RTPROT_KERNEL)
2720 continue;
2721
2722 r = route_remove(route, link, link_route_remove_handler);
2723 if (r < 0)
2724 return r;
2725 }
2726
2727 ndisc_flush(link);
2728
2729 return 0;
2730 }
2731
2732 static int link_update_lldp(Link *link) {
2733 int r;
2734
2735 assert(link);
2736
2737 if (!link->lldp)
2738 return 0;
2739
2740 if (link->flags & IFF_UP) {
2741 r = sd_lldp_start(link->lldp);
2742 if (r > 0)
2743 log_link_debug(link, "Started LLDP.");
2744 } else {
2745 r = sd_lldp_stop(link->lldp);
2746 if (r > 0)
2747 log_link_debug(link, "Stopped LLDP.");
2748 }
2749
2750 return r;
2751 }
2752
2753 static int link_configure_can(Link *link) {
2754 int r;
2755
2756 if (streq_ptr(link->kind, "can")) {
2757 /* The CAN interface must be down to configure bitrate, etc... */
2758 if ((link->flags & IFF_UP)) {
2759 r = link_down(link);
2760 if (r < 0) {
2761 link_enter_failed(link);
2762 return r;
2763 }
2764
2765 return 0;
2766 }
2767
2768 return link_set_can(link);
2769 }
2770
2771 if (!(link->flags & IFF_UP)) {
2772 r = link_up_can(link);
2773 if (r < 0) {
2774 link_enter_failed(link);
2775 return r;
2776 }
2777 }
2778
2779 return 0;
2780 }
2781
2782 static int link_configure(Link *link) {
2783 int r;
2784
2785 assert(link);
2786 assert(link->network);
2787 assert(link->state == LINK_STATE_PENDING);
2788
2789 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
2790 return link_configure_can(link);
2791
2792 /* Drop foreign config, but ignore loopback or critical devices.
2793 * We do not want to remove loopback address or addresses used for root NFS. */
2794 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2795 r = link_drop_foreign_config(link);
2796 if (r < 0)
2797 return r;
2798 }
2799
2800 r = link_set_proxy_arp(link);
2801 if (r < 0)
2802 return r;
2803
2804 r = ipv6_proxy_ndp_addresses_configure(link);
2805 if (r < 0)
2806 return r;
2807
2808 r = link_set_ipv4_forward(link);
2809 if (r < 0)
2810 return r;
2811
2812 r = link_set_ipv6_forward(link);
2813 if (r < 0)
2814 return r;
2815
2816 r = link_set_ipv6_privacy_extensions(link);
2817 if (r < 0)
2818 return r;
2819
2820 r = link_set_ipv6_accept_ra(link);
2821 if (r < 0)
2822 return r;
2823
2824 r = link_set_ipv6_dad_transmits(link);
2825 if (r < 0)
2826 return r;
2827
2828 r = link_set_ipv6_hop_limit(link);
2829 if (r < 0)
2830 return r;
2831
2832 r = link_set_flags(link);
2833 if (r < 0)
2834 return r;
2835
2836 r = link_set_ipv6_mtu(link);
2837 if (r < 0)
2838 return r;
2839
2840 if (link_ipv4ll_enabled(link)) {
2841 r = ipv4ll_configure(link);
2842 if (r < 0)
2843 return r;
2844 }
2845
2846 if (link_dhcp4_enabled(link)) {
2847 r = dhcp4_set_promote_secondaries(link);
2848 if (r < 0)
2849 return r;
2850
2851 r = dhcp4_configure(link);
2852 if (r < 0)
2853 return r;
2854 }
2855
2856 if (link_dhcp4_server_enabled(link)) {
2857 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2858 if (r < 0)
2859 return r;
2860
2861 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2862 if (r < 0)
2863 return r;
2864 }
2865
2866 if (link_dhcp6_enabled(link) ||
2867 link_ipv6_accept_ra_enabled(link)) {
2868 r = dhcp6_configure(link);
2869 if (r < 0)
2870 return r;
2871 }
2872
2873 if (link_ipv6_accept_ra_enabled(link)) {
2874 r = ndisc_configure(link);
2875 if (r < 0)
2876 return r;
2877 }
2878
2879 if (link_radv_enabled(link)) {
2880 r = radv_configure(link);
2881 if (r < 0)
2882 return r;
2883 }
2884
2885 if (link_lldp_rx_enabled(link)) {
2886 r = sd_lldp_new(&link->lldp);
2887 if (r < 0)
2888 return r;
2889
2890 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
2891 if (r < 0)
2892 return r;
2893
2894 r = sd_lldp_match_capabilities(link->lldp,
2895 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
2896 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
2897 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
2898 if (r < 0)
2899 return r;
2900
2901 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
2902 if (r < 0)
2903 return r;
2904
2905 r = sd_lldp_attach_event(link->lldp, NULL, 0);
2906 if (r < 0)
2907 return r;
2908
2909 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
2910 if (r < 0)
2911 return r;
2912
2913 r = link_update_lldp(link);
2914 if (r < 0)
2915 return r;
2916 }
2917
2918 if (link->network->mtu > 0) {
2919 r = link_set_mtu(link, link->network->mtu);
2920 if (r < 0)
2921 return r;
2922 }
2923
2924 return link_configure_after_setting_mtu(link);
2925 }
2926
2927 static int link_configure_after_setting_mtu(Link *link) {
2928 int r;
2929
2930 assert(link);
2931 assert(link->network);
2932 assert(link->state == LINK_STATE_PENDING);
2933
2934 if (link->setting_mtu)
2935 return 0;
2936
2937 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2938 r = link_acquire_conf(link);
2939 if (r < 0)
2940 return r;
2941 }
2942
2943 return link_enter_join_netdev(link);
2944 }
2945
2946 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
2947 assert(duid);
2948
2949 if (duid->raw_data_len > 0)
2950 return 0;
2951
2952 if (duid->type != DUID_TYPE_UUID)
2953 return -EINVAL;
2954
2955 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
2956 duid->raw_data_len = sizeof(sd_id128_t);
2957
2958 return 1;
2959 }
2960
2961 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
2962 Manager *manager = userdata;
2963 const sd_bus_error *e;
2964 const void *a;
2965 size_t sz;
2966 DUID *duid;
2967 Link *link;
2968 int r;
2969
2970 assert(m);
2971 assert(manager);
2972
2973 e = sd_bus_message_get_error(m);
2974 if (e) {
2975 log_error_errno(sd_bus_error_get_errno(e),
2976 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
2977 e->message);
2978 goto configure;
2979 }
2980
2981 r = sd_bus_message_read_array(m, 'y', &a, &sz);
2982 if (r < 0)
2983 goto configure;
2984
2985 if (sz != sizeof(sd_id128_t)) {
2986 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
2987 goto configure;
2988 }
2989
2990 memcpy(&manager->product_uuid, a, sz);
2991 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
2992 (void) duid_set_uuid(duid, manager->product_uuid);
2993
2994 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
2995
2996 configure:
2997 while ((link = set_steal_first(manager->links_requesting_uuid))) {
2998 r = link_configure(link);
2999 if (r < 0)
3000 log_link_error_errno(link, r, "Failed to configure link: %m");
3001 }
3002
3003 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3004
3005 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3006 * even if the method fails. */
3007 manager->has_product_uuid = true;
3008
3009 return 1;
3010 }
3011
3012 static bool link_requires_uuid(Link *link) {
3013 const DUID *duid;
3014
3015 assert(link);
3016 assert(link->manager);
3017 assert(link->network);
3018
3019 duid = link_get_duid(link);
3020 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3021 return false;
3022
3023 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3024 return true;
3025
3026 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3027 return true;
3028
3029 return false;
3030 }
3031
3032 static int link_configure_duid(Link *link) {
3033 Manager *m;
3034 DUID *duid;
3035 int r;
3036
3037 assert(link);
3038 assert(link->manager);
3039 assert(link->network);
3040
3041 m = link->manager;
3042 duid = link_get_duid(link);
3043
3044 if (!link_requires_uuid(link))
3045 return 1;
3046
3047 if (m->has_product_uuid) {
3048 (void) duid_set_uuid(duid, m->product_uuid);
3049 return 1;
3050 }
3051
3052 if (!m->links_requesting_uuid) {
3053 r = manager_request_product_uuid(m, link);
3054 if (r < 0) {
3055 if (r == -ENOMEM)
3056 return r;
3057
3058 log_link_warning_errno(link, r,
3059 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3060 return 1;
3061 }
3062 } else {
3063 r = set_put(m->links_requesting_uuid, link);
3064 if (r < 0)
3065 return log_oom();
3066
3067 r = set_put(m->duids_requesting_uuid, duid);
3068 if (r < 0)
3069 return log_oom();
3070 }
3071
3072 return 0;
3073 }
3074
3075 static int link_initialized_and_synced(Link *link) {
3076 Network *network;
3077 int r;
3078
3079 assert(link);
3080 assert(link->ifname);
3081 assert(link->manager);
3082
3083 if (link->state != LINK_STATE_PENDING)
3084 return 1;
3085
3086 log_link_debug(link, "Link state is up-to-date");
3087
3088 r = link_new_bound_by_list(link);
3089 if (r < 0)
3090 return r;
3091
3092 r = link_handle_bound_by_list(link);
3093 if (r < 0)
3094 return r;
3095
3096 if (!link->network) {
3097 r = network_get(link->manager, link->sd_device, link->ifname,
3098 &link->mac, &network);
3099 if (r == -ENOENT) {
3100 link_enter_unmanaged(link);
3101 return 1;
3102 } else if (r == 0 && network->unmanaged) {
3103 link_enter_unmanaged(link);
3104 return 0;
3105 } else if (r < 0)
3106 return r;
3107
3108 if (link->flags & IFF_LOOPBACK) {
3109 if (network->link_local != ADDRESS_FAMILY_NO)
3110 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3111
3112 if (network->dhcp != ADDRESS_FAMILY_NO)
3113 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3114
3115 if (network->dhcp_server)
3116 log_link_debug(link, "Ignoring DHCP server for loopback link");
3117 }
3118
3119 r = network_apply(network, link);
3120 if (r < 0)
3121 return r;
3122 }
3123
3124 r = link_new_bound_to_list(link);
3125 if (r < 0)
3126 return r;
3127
3128 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3129 * link_configure() is called later asynchronously. */
3130 r = link_configure_duid(link);
3131 if (r <= 0)
3132 return r;
3133
3134 r = link_configure(link);
3135 if (r < 0)
3136 return r;
3137
3138 return 1;
3139 }
3140
3141 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
3142 (void) link_initialized_and_synced(userdata);
3143 return 1;
3144 }
3145
3146 int link_initialized(Link *link, sd_device *device) {
3147 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3148 int r;
3149
3150 assert(link);
3151 assert(link->manager);
3152 assert(link->manager->rtnl);
3153 assert(device);
3154
3155 if (link->state != LINK_STATE_PENDING)
3156 return 0;
3157
3158 if (link->sd_device)
3159 return 0;
3160
3161 log_link_debug(link, "udev initialized link");
3162
3163 link->sd_device = sd_device_ref(device);
3164
3165 /* udev has initialized the link, but we don't know if we have yet
3166 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3167 * when it returns we know that the pending NEWLINKs have already been
3168 * processed and that we are up-to-date */
3169
3170 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3171 link->ifindex);
3172 if (r < 0)
3173 return r;
3174
3175 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3176 link_netlink_destroy_callback, link, 0, __func__);
3177 if (r < 0)
3178 return r;
3179
3180 link_ref(link);
3181
3182 return 0;
3183 }
3184
3185 static int link_load(Link *link) {
3186 _cleanup_free_ char *network_file = NULL,
3187 *addresses = NULL,
3188 *routes = NULL,
3189 *dhcp4_address = NULL,
3190 *ipv4ll_address = NULL;
3191 union in_addr_union address;
3192 union in_addr_union route_dst;
3193 const char *p;
3194 int r;
3195
3196 assert(link);
3197
3198 r = parse_env_file(NULL, link->state_file,
3199 "NETWORK_FILE", &network_file,
3200 "ADDRESSES", &addresses,
3201 "ROUTES", &routes,
3202 "DHCP4_ADDRESS", &dhcp4_address,
3203 "IPV4LL_ADDRESS", &ipv4ll_address);
3204 if (r < 0 && r != -ENOENT)
3205 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3206
3207 if (network_file) {
3208 Network *network;
3209 char *suffix;
3210
3211 /* drop suffix */
3212 suffix = strrchr(network_file, '.');
3213 if (!suffix) {
3214 log_link_debug(link, "Failed to get network name from %s", network_file);
3215 goto network_file_fail;
3216 }
3217 *suffix = '\0';
3218
3219 r = network_get_by_name(link->manager, basename(network_file), &network);
3220 if (r < 0) {
3221 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3222 goto network_file_fail;
3223 }
3224
3225 r = network_apply(network, link);
3226 if (r < 0)
3227 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3228 }
3229
3230 network_file_fail:
3231
3232 if (addresses) {
3233 p = addresses;
3234
3235 for (;;) {
3236 _cleanup_free_ char *address_str = NULL;
3237 char *prefixlen_str;
3238 int family;
3239 unsigned char prefixlen;
3240
3241 r = extract_first_word(&p, &address_str, NULL, 0);
3242 if (r < 0) {
3243 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3244 continue;
3245 }
3246 if (r == 0)
3247 break;
3248
3249 prefixlen_str = strchr(address_str, '/');
3250 if (!prefixlen_str) {
3251 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3252 continue;
3253 }
3254
3255 *prefixlen_str++ = '\0';
3256
3257 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3258 if (r != 1) {
3259 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3260 continue;
3261 }
3262
3263 r = in_addr_from_string_auto(address_str, &family, &address);
3264 if (r < 0) {
3265 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3266 continue;
3267 }
3268
3269 r = address_add(link, family, &address, prefixlen, NULL);
3270 if (r < 0)
3271 return log_link_error_errno(link, r, "Failed to add address: %m");
3272 }
3273 }
3274
3275 if (routes) {
3276 p = routes;
3277
3278 for (;;) {
3279 Route *route;
3280 _cleanup_free_ char *route_str = NULL;
3281 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3282 usec_t lifetime;
3283 char *prefixlen_str;
3284 int family;
3285 unsigned char prefixlen, tos, table;
3286 uint32_t priority;
3287
3288 r = extract_first_word(&p, &route_str, NULL, 0);
3289 if (r < 0) {
3290 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3291 continue;
3292 }
3293 if (r == 0)
3294 break;
3295
3296 prefixlen_str = strchr(route_str, '/');
3297 if (!prefixlen_str) {
3298 log_link_debug(link, "Failed to parse route %s", route_str);
3299 continue;
3300 }
3301
3302 *prefixlen_str++ = '\0';
3303
3304 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3305 if (r != 5) {
3306 log_link_debug(link,
3307 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3308 prefixlen_str);
3309 continue;
3310 }
3311
3312 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3313 if (r < 0) {
3314 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3315 continue;
3316 }
3317
3318 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3319 if (r < 0)
3320 return log_link_error_errno(link, r, "Failed to add route: %m");
3321
3322 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3323 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3324 0, route_expire_handler, route);
3325 if (r < 0)
3326 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3327 }
3328
3329 route->lifetime = lifetime;
3330 sd_event_source_unref(route->expire);
3331 route->expire = TAKE_PTR(expire);
3332 }
3333 }
3334
3335 if (dhcp4_address) {
3336 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3337 if (r < 0) {
3338 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3339 goto dhcp4_address_fail;
3340 }
3341
3342 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3343 if (r < 0)
3344 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3345
3346 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3347 if (r < 0)
3348 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3349 }
3350
3351 dhcp4_address_fail:
3352
3353 if (ipv4ll_address) {
3354 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3355 if (r < 0) {
3356 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3357 goto ipv4ll_address_fail;
3358 }
3359
3360 r = sd_ipv4ll_new(&link->ipv4ll);
3361 if (r < 0)
3362 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3363
3364 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3365 if (r < 0)
3366 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3367 }
3368
3369 ipv4ll_address_fail:
3370
3371 return 0;
3372 }
3373
3374 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3375 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3376 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3377 Link *link;
3378 int r;
3379
3380 assert(m);
3381 assert(m->rtnl);
3382 assert(message);
3383 assert(ret);
3384
3385 r = link_new(m, message, ret);
3386 if (r < 0)
3387 return r;
3388
3389 link = *ret;
3390
3391 log_link_debug(link, "Link %d added", link->ifindex);
3392
3393 r = link_load(link);
3394 if (r < 0)
3395 return r;
3396
3397 if (detect_container() <= 0) {
3398 /* not in a container, udev will be around */
3399 sprintf(ifindex_str, "n%d", link->ifindex);
3400 r = sd_device_new_from_device_id(&device, ifindex_str);
3401 if (r < 0) {
3402 log_link_warning_errno(link, r, "Could not find device: %m");
3403 goto failed;
3404 }
3405
3406 r = sd_device_get_is_initialized(device);
3407 if (r < 0) {
3408 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3409 goto failed;
3410 }
3411 if (r == 0) {
3412 /* not yet ready */
3413 log_link_debug(link, "link pending udev initialization...");
3414 return 0;
3415 }
3416
3417 r = link_initialized(link, device);
3418 if (r < 0)
3419 goto failed;
3420 } else {
3421 r = link_initialized_and_synced(link);
3422 if (r < 0)
3423 goto failed;
3424 }
3425
3426 return 0;
3427 failed:
3428 link_enter_failed(link);
3429 return r;
3430 }
3431
3432 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3433 int r;
3434
3435 assert(link);
3436
3437 log_link_info(link, "Gained IPv6LL");
3438
3439 link->ipv6ll_address = *address;
3440 link_check_ready(link);
3441
3442 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3443 r = link_acquire_ipv6_conf(link);
3444 if (r < 0) {
3445 link_enter_failed(link);
3446 return r;
3447 }
3448 }
3449
3450 return 0;
3451 }
3452
3453 static int link_carrier_gained(Link *link) {
3454 int r;
3455
3456 assert(link);
3457
3458 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3459 r = link_acquire_conf(link);
3460 if (r < 0) {
3461 link_enter_failed(link);
3462 return r;
3463 }
3464
3465 r = link_enter_set_addresses(link);
3466 if (r < 0)
3467 return r;
3468 }
3469
3470 r = link_handle_bound_by_list(link);
3471 if (r < 0)
3472 return r;
3473
3474 return 0;
3475 }
3476
3477 static int link_carrier_lost(Link *link) {
3478 int r;
3479
3480 assert(link);
3481
3482 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3483 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3484 * configuration and stop the clients as well. */
3485 if (link->setting_mtu)
3486 return 0;
3487
3488 r = link_stop_clients(link);
3489 if (r < 0) {
3490 link_enter_failed(link);
3491 return r;
3492 }
3493
3494 if (link_dhcp4_server_enabled(link))
3495 (void) sd_dhcp_server_stop(link->dhcp_server);
3496
3497 r = link_drop_config(link);
3498 if (r < 0)
3499 return r;
3500
3501 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3502 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3503 r = link_drop_foreign_config(link);
3504 if (r < 0)
3505 return r;
3506 }
3507
3508 r = link_handle_bound_by_list(link);
3509 if (r < 0)
3510 return r;
3511
3512 return 0;
3513 }
3514
3515 int link_carrier_reset(Link *link) {
3516 int r;
3517
3518 assert(link);
3519
3520 if (link_has_carrier(link)) {
3521 r = link_carrier_lost(link);
3522 if (r < 0)
3523 return r;
3524
3525 r = link_carrier_gained(link);
3526 if (r < 0)
3527 return r;
3528
3529 log_link_info(link, "Reset carrier");
3530 }
3531
3532 return 0;
3533 }
3534
3535 int link_update(Link *link, sd_netlink_message *m) {
3536 struct ether_addr mac;
3537 const char *ifname;
3538 uint32_t mtu;
3539 bool had_carrier, carrier_gained, carrier_lost;
3540 int r;
3541
3542 assert(link);
3543 assert(link->ifname);
3544 assert(m);
3545
3546 if (link->state == LINK_STATE_LINGER) {
3547 log_link_info(link, "Link readded");
3548 link_set_state(link, LINK_STATE_ENSLAVING);
3549
3550 r = link_new_carrier_maps(link);
3551 if (r < 0)
3552 return r;
3553 }
3554
3555 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3556 if (r >= 0 && !streq(ifname, link->ifname)) {
3557 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3558
3559 if (link->state == LINK_STATE_PENDING) {
3560 r = free_and_strdup(&link->ifname, ifname);
3561 if (r < 0)
3562 return r;
3563 } else {
3564 Manager *manager = link->manager;
3565
3566 link_drop(link);
3567 r = link_add(manager, m, &link);
3568 if (r < 0)
3569 return r;
3570 }
3571 }
3572
3573 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3574 if (r >= 0 && mtu > 0) {
3575 link->mtu = mtu;
3576 if (link->original_mtu == 0) {
3577 link->original_mtu = mtu;
3578 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3579 }
3580
3581 if (link->dhcp_client) {
3582 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3583 link->mtu);
3584 if (r < 0)
3585 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3586 }
3587
3588 if (link->radv) {
3589 r = sd_radv_set_mtu(link->radv, link->mtu);
3590 if (r < 0)
3591 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3592 }
3593 }
3594
3595 /* The kernel may broadcast NEWLINK messages without the MAC address
3596 set, simply ignore them. */
3597 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3598 if (r >= 0) {
3599 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3600 ETH_ALEN)) {
3601
3602 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3603 ETH_ALEN);
3604
3605 log_link_debug(link, "MAC address: "
3606 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3607 mac.ether_addr_octet[0],
3608 mac.ether_addr_octet[1],
3609 mac.ether_addr_octet[2],
3610 mac.ether_addr_octet[3],
3611 mac.ether_addr_octet[4],
3612 mac.ether_addr_octet[5]);
3613
3614 if (link->ipv4ll) {
3615 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3616 if (r < 0)
3617 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3618 }
3619
3620 if (link->dhcp_client) {
3621 r = sd_dhcp_client_set_mac(link->dhcp_client,
3622 (const uint8_t *) &link->mac,
3623 sizeof (link->mac),
3624 ARPHRD_ETHER);
3625 if (r < 0)
3626 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3627
3628 r = dhcp4_set_client_identifier(link);
3629 if (r < 0)
3630 return r;
3631 }
3632
3633 if (link->dhcp6_client) {
3634 const DUID* duid = link_get_duid(link);
3635
3636 r = sd_dhcp6_client_set_mac(link->dhcp6_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 DHCPv6 client: %m");
3642
3643 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3644 link->network->iaid);
3645 if (r < 0)
3646 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3647
3648 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3649 duid->type,
3650 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3651 duid->raw_data_len);
3652 if (r < 0)
3653 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3654 }
3655
3656 if (link->radv) {
3657 r = sd_radv_set_mac(link->radv, &link->mac);
3658 if (r < 0)
3659 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3660 }
3661
3662 if (link->ndisc) {
3663 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3664 if (r < 0)
3665 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3666 }
3667 }
3668 }
3669
3670 had_carrier = link_has_carrier(link);
3671
3672 r = link_update_flags(link, m);
3673 if (r < 0)
3674 return r;
3675
3676 r = link_update_lldp(link);
3677 if (r < 0)
3678 return r;
3679
3680 carrier_gained = !had_carrier && link_has_carrier(link);
3681 carrier_lost = had_carrier && !link_has_carrier(link);
3682
3683 if (carrier_gained) {
3684 log_link_info(link, "Gained carrier");
3685
3686 r = link_carrier_gained(link);
3687 if (r < 0)
3688 return r;
3689 } else if (carrier_lost) {
3690 log_link_info(link, "Lost carrier");
3691
3692 r = link_carrier_lost(link);
3693 if (r < 0)
3694 return r;
3695 }
3696
3697 return 0;
3698 }
3699
3700 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3701 bool space = false;
3702 Iterator i;
3703 Link *link;
3704
3705 assert(f);
3706 assert(prefix);
3707
3708 if (hashmap_isempty(h))
3709 return;
3710
3711 fputs(prefix, f);
3712 HASHMAP_FOREACH(link, h, i) {
3713 if (space)
3714 fputc(' ', f);
3715
3716 fprintf(f, "%i", link->ifindex);
3717 space = true;
3718 }
3719
3720 fputc('\n', f);
3721 }
3722
3723 int link_save(Link *link) {
3724 _cleanup_free_ char *temp_path = NULL;
3725 _cleanup_fclose_ FILE *f = NULL;
3726 const char *admin_state, *oper_state;
3727 Address *a;
3728 Route *route;
3729 Iterator i;
3730 int r;
3731
3732 assert(link);
3733 assert(link->state_file);
3734 assert(link->lease_file);
3735 assert(link->manager);
3736
3737 if (link->state == LINK_STATE_LINGER) {
3738 unlink(link->state_file);
3739 return 0;
3740 }
3741
3742 link_lldp_save(link);
3743
3744 admin_state = link_state_to_string(link->state);
3745 assert(admin_state);
3746
3747 oper_state = link_operstate_to_string(link->operstate);
3748 assert(oper_state);
3749
3750 r = fopen_temporary(link->state_file, &f, &temp_path);
3751 if (r < 0)
3752 goto fail;
3753
3754 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
3755 (void) fchmod(fileno(f), 0644);
3756
3757 fprintf(f,
3758 "# This is private data. Do not parse.\n"
3759 "ADMIN_STATE=%s\n"
3760 "OPER_STATE=%s\n",
3761 admin_state, oper_state);
3762
3763 if (link->network) {
3764 bool space;
3765 sd_dhcp6_lease *dhcp6_lease = NULL;
3766 const char *dhcp_domainname = NULL;
3767 char **dhcp6_domains = NULL;
3768 char **dhcp_domains = NULL;
3769 unsigned j;
3770
3771 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3772 yes_no(link->network->required_for_online));
3773
3774 if (link->dhcp6_client) {
3775 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3776 if (r < 0 && r != -ENOMSG)
3777 log_link_debug(link, "No DHCPv6 lease");
3778 }
3779
3780 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3781
3782 fputs("DNS=", f);
3783 space = false;
3784
3785 for (j = 0; j < link->network->n_dns; j++) {
3786 _cleanup_free_ char *b = NULL;
3787
3788 r = in_addr_to_string(link->network->dns[j].family,
3789 &link->network->dns[j].address, &b);
3790 if (r < 0) {
3791 log_debug_errno(r, "Failed to format address, ignoring: %m");
3792 continue;
3793 }
3794
3795 if (space)
3796 fputc(' ', f);
3797 fputs(b, f);
3798 space = true;
3799 }
3800
3801 if (link->network->dhcp_use_dns &&
3802 link->dhcp_lease) {
3803 const struct in_addr *addresses;
3804
3805 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3806 if (r > 0) {
3807 if (space)
3808 fputc(' ', f);
3809 serialize_in_addrs(f, addresses, r);
3810 space = true;
3811 }
3812 }
3813
3814 if (link->network->dhcp_use_dns && dhcp6_lease) {
3815 struct in6_addr *in6_addrs;
3816
3817 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3818 if (r > 0) {
3819 if (space)
3820 fputc(' ', f);
3821 serialize_in6_addrs(f, in6_addrs, r);
3822 space = true;
3823 }
3824 }
3825
3826 /* Make sure to flush out old entries before we use the NDISC data */
3827 ndisc_vacuum(link);
3828
3829 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3830 NDiscRDNSS *dd;
3831
3832 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3833 if (space)
3834 fputc(' ', f);
3835
3836 serialize_in6_addrs(f, &dd->address, 1);
3837 space = true;
3838 }
3839 }
3840
3841 fputc('\n', f);
3842
3843 fputs("NTP=", f);
3844 space = false;
3845 fputstrv(f, link->network->ntp, NULL, &space);
3846
3847 if (link->network->dhcp_use_ntp &&
3848 link->dhcp_lease) {
3849 const struct in_addr *addresses;
3850
3851 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3852 if (r > 0) {
3853 if (space)
3854 fputc(' ', f);
3855 serialize_in_addrs(f, addresses, r);
3856 space = true;
3857 }
3858 }
3859
3860 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3861 struct in6_addr *in6_addrs;
3862 char **hosts;
3863
3864 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3865 &in6_addrs);
3866 if (r > 0) {
3867 if (space)
3868 fputc(' ', f);
3869 serialize_in6_addrs(f, in6_addrs, r);
3870 space = true;
3871 }
3872
3873 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3874 if (r > 0)
3875 fputstrv(f, hosts, NULL, &space);
3876 }
3877
3878 fputc('\n', f);
3879
3880 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3881 if (link->dhcp_lease) {
3882 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3883 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3884 }
3885 if (dhcp6_lease)
3886 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3887 }
3888
3889 fputs("DOMAINS=", f);
3890 space = false;
3891 fputstrv(f, link->network->search_domains, NULL, &space);
3892
3893 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3894 NDiscDNSSL *dd;
3895
3896 if (dhcp_domainname)
3897 fputs_with_space(f, dhcp_domainname, NULL, &space);
3898 if (dhcp_domains)
3899 fputstrv(f, dhcp_domains, NULL, &space);
3900 if (dhcp6_domains)
3901 fputstrv(f, dhcp6_domains, NULL, &space);
3902
3903 SET_FOREACH(dd, link->ndisc_dnssl, i)
3904 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3905 }
3906
3907 fputc('\n', f);
3908
3909 fputs("ROUTE_DOMAINS=", f);
3910 space = false;
3911 fputstrv(f, link->network->route_domains, NULL, &space);
3912
3913 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3914 NDiscDNSSL *dd;
3915
3916 if (dhcp_domainname)
3917 fputs_with_space(f, dhcp_domainname, NULL, &space);
3918 if (dhcp_domains)
3919 fputstrv(f, dhcp_domains, NULL, &space);
3920 if (dhcp6_domains)
3921 fputstrv(f, dhcp6_domains, NULL, &space);
3922
3923 SET_FOREACH(dd, link->ndisc_dnssl, i)
3924 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3925 }
3926
3927 fputc('\n', f);
3928
3929 fprintf(f, "LLMNR=%s\n",
3930 resolve_support_to_string(link->network->llmnr));
3931 fprintf(f, "MDNS=%s\n",
3932 resolve_support_to_string(link->network->mdns));
3933
3934 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3935 fprintf(f, "DNS_OVER_TLS=%s\n",
3936 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
3937
3938 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3939 fprintf(f, "DNSSEC=%s\n",
3940 dnssec_mode_to_string(link->network->dnssec_mode));
3941
3942 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3943 const char *n;
3944
3945 fputs("DNSSEC_NTA=", f);
3946 space = false;
3947 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3948 fputs_with_space(f, n, NULL, &space);
3949 fputc('\n', f);
3950 }
3951
3952 fputs("ADDRESSES=", f);
3953 space = false;
3954 SET_FOREACH(a, link->addresses, i) {
3955 _cleanup_free_ char *address_str = NULL;
3956
3957 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3958 if (r < 0)
3959 goto fail;
3960
3961 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3962 space = true;
3963 }
3964 fputc('\n', f);
3965
3966 fputs("ROUTES=", f);
3967 space = false;
3968 SET_FOREACH(route, link->routes, i) {
3969 _cleanup_free_ char *route_str = NULL;
3970
3971 r = in_addr_to_string(route->family, &route->dst, &route_str);
3972 if (r < 0)
3973 goto fail;
3974
3975 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
3976 space ? " " : "", route_str,
3977 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3978 space = true;
3979 }
3980
3981 fputc('\n', f);
3982 }
3983
3984 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3985 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3986
3987 if (link->dhcp_lease) {
3988 struct in_addr address;
3989 const char *tz = NULL;
3990
3991 assert(link->network);
3992
3993 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3994 if (r >= 0)
3995 fprintf(f, "TIMEZONE=%s\n", tz);
3996
3997 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3998 if (r >= 0) {
3999 fputs("DHCP4_ADDRESS=", f);
4000 serialize_in_addrs(f, &address, 1);
4001 fputc('\n', f);
4002 }
4003
4004 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4005 if (r < 0)
4006 goto fail;
4007
4008 fprintf(f,
4009 "DHCP_LEASE=%s\n",
4010 link->lease_file);
4011 } else
4012 unlink(link->lease_file);
4013
4014 if (link->ipv4ll) {
4015 struct in_addr address;
4016
4017 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4018 if (r >= 0) {
4019 fputs("IPV4LL_ADDRESS=", f);
4020 serialize_in_addrs(f, &address, 1);
4021 fputc('\n', f);
4022 }
4023 }
4024
4025 r = fflush_and_check(f);
4026 if (r < 0)
4027 goto fail;
4028
4029 if (rename(temp_path, link->state_file) < 0) {
4030 r = -errno;
4031 goto fail;
4032 }
4033
4034 return 0;
4035
4036 fail:
4037 (void) unlink(link->state_file);
4038 if (temp_path)
4039 (void) unlink(temp_path);
4040
4041 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4042 }
4043
4044 /* The serialized state in /run is no longer up-to-date. */
4045 void link_dirty(Link *link) {
4046 int r;
4047
4048 assert(link);
4049
4050 /* mark manager dirty as link is dirty */
4051 manager_dirty(link->manager);
4052
4053 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
4054 if (r < 0)
4055 /* allocation errors are ignored */
4056 return;
4057
4058 r = set_put(link->manager->dirty_links, link);
4059 if (r <= 0)
4060 /* don't take another ref if the link was already dirty */
4061 return;
4062
4063 link_ref(link);
4064 }
4065
4066 /* The serialized state in /run is up-to-date */
4067 void link_clean(Link *link) {
4068 assert(link);
4069 assert(link->manager);
4070
4071 link_unref(set_remove(link->manager->dirty_links, link));
4072 }
4073
4074 static const char* const link_state_table[_LINK_STATE_MAX] = {
4075 [LINK_STATE_PENDING] = "pending",
4076 [LINK_STATE_ENSLAVING] = "configuring",
4077 [LINK_STATE_SETTING_ADDRESSES] = "configuring",
4078 [LINK_STATE_SETTING_ROUTES] = "configuring",
4079 [LINK_STATE_CONFIGURED] = "configured",
4080 [LINK_STATE_UNMANAGED] = "unmanaged",
4081 [LINK_STATE_FAILED] = "failed",
4082 [LINK_STATE_LINGER] = "linger",
4083 };
4084
4085 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
4086
4087 static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
4088 [LINK_OPERSTATE_OFF] = "off",
4089 [LINK_OPERSTATE_NO_CARRIER] = "no-carrier",
4090 [LINK_OPERSTATE_DORMANT] = "dormant",
4091 [LINK_OPERSTATE_CARRIER] = "carrier",
4092 [LINK_OPERSTATE_DEGRADED] = "degraded",
4093 [LINK_OPERSTATE_ROUTABLE] = "routable",
4094 };
4095
4096 DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
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