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Merge pull request #10948 from ssahani/iprule-port-proto
[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 Route *rt;
854 int r;
855
856 assert(link);
857 assert(link->network);
858 assert(link->state == LINK_STATE_SETTING_ADDRESSES);
859
860 (void) link_set_routing_policy_rule(link);
861
862 link_set_state(link, LINK_STATE_SETTING_ROUTES);
863
864 /* First add the default route i.e. Gateway.*/
865 LIST_FOREACH(routes, rt, link->network->static_routes)
866 if (in_addr_is_null(rt->family, &rt->gw)) {
867 r = route_configure(rt, link, route_handler);
868 if (r < 0) {
869 log_link_warning_errno(link, r, "Could not set routes: %m");
870 link_enter_failed(link);
871 return r;
872 }
873
874 link->route_messages++;
875 }
876
877 LIST_FOREACH(routes, rt, link->network->static_routes)
878 if (!in_addr_is_null(rt->family, &rt->gw)) {
879 r = route_configure(rt, link, route_handler);
880 if (r < 0) {
881 log_link_warning_errno(link, r, "Could not set routes: %m");
882 link_enter_failed(link);
883 return r;
884 }
885
886 link->route_messages++;
887 }
888
889 if (link->route_messages == 0) {
890 link->static_routes_configured = true;
891 link_check_ready(link);
892 } else
893 log_link_debug(link, "Setting routes");
894
895 return 0;
896 }
897
898 int link_route_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
899 Link *link = userdata;
900 int r;
901
902 assert(m);
903 assert(link);
904 assert(link->ifname);
905
906 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
907 return 1;
908
909 r = sd_netlink_message_get_errno(m);
910 if (r < 0 && r != -ESRCH)
911 log_link_warning_errno(link, r, "Could not drop route: %m");
912
913 return 1;
914 }
915
916 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
917 Link *link = userdata;
918 int r;
919
920 assert(rtnl);
921 assert(m);
922 assert(link);
923 assert(link->ifname);
924 assert(link->address_messages > 0);
925 assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
926 LINK_STATE_FAILED, LINK_STATE_LINGER));
927
928 link->address_messages--;
929
930 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
931 return 1;
932
933 r = sd_netlink_message_get_errno(m);
934 if (r < 0 && r != -EEXIST)
935 log_link_warning_errno(link, r, "could not set address: %m");
936 else if (r >= 0)
937 manager_rtnl_process_address(rtnl, m, link->manager);
938
939 if (link->address_messages == 0) {
940 log_link_debug(link, "Addresses set");
941 link_enter_set_routes(link);
942 }
943
944 return 1;
945 }
946
947 static int address_label_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
948 Link *link = userdata;
949 int r;
950
951 assert(rtnl);
952 assert(m);
953 assert(link);
954 assert(link->ifname);
955 assert(link->address_label_messages > 0);
956
957 link->address_label_messages--;
958
959 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
960 return 1;
961
962 r = sd_netlink_message_get_errno(m);
963 if (r < 0 && r != -EEXIST)
964 log_link_warning_errno(link, r, "could not set address label: %m");
965 else if (r >= 0)
966 manager_rtnl_process_address(rtnl, m, link->manager);
967
968 if (link->address_label_messages == 0)
969 log_link_debug(link, "Addresses label set");
970
971 return 1;
972 }
973
974 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
975 _cleanup_free_ struct in_addr *addresses = NULL;
976 size_t n_addresses = 0, n_allocated = 0;
977 unsigned i;
978
979 log_debug("Copying DNS server information from %s", link->ifname);
980
981 if (!link->network)
982 return 0;
983
984 for (i = 0; i < link->network->n_dns; i++) {
985 struct in_addr ia;
986
987 /* Only look for IPv4 addresses */
988 if (link->network->dns[i].family != AF_INET)
989 continue;
990
991 ia = link->network->dns[i].address.in;
992
993 /* Never propagate obviously borked data */
994 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
995 continue;
996
997 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
998 return log_oom();
999
1000 addresses[n_addresses++] = ia;
1001 }
1002
1003 if (link->network->dhcp_use_dns && link->dhcp_lease) {
1004 const struct in_addr *da = NULL;
1005 int n;
1006
1007 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
1008 if (n > 0) {
1009
1010 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1011 return log_oom();
1012
1013 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
1014 n_addresses += n;
1015 }
1016 }
1017
1018 if (n_addresses <= 0)
1019 return 0;
1020
1021 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
1022 }
1023
1024 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1025 _cleanup_free_ struct in_addr *addresses = NULL;
1026 size_t n_addresses = 0, n_allocated = 0;
1027 char **a;
1028
1029 if (!link->network)
1030 return 0;
1031
1032 log_debug("Copying NTP server information from %s", link->ifname);
1033
1034 STRV_FOREACH(a, link->network->ntp) {
1035 struct in_addr ia;
1036
1037 /* Only look for IPv4 addresses */
1038 if (inet_pton(AF_INET, *a, &ia) <= 0)
1039 continue;
1040
1041 /* Never propagate obviously borked data */
1042 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1043 continue;
1044
1045 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1046 return log_oom();
1047
1048 addresses[n_addresses++] = ia;
1049 }
1050
1051 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1052 const struct in_addr *da = NULL;
1053 int n;
1054
1055 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1056 if (n > 0) {
1057
1058 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1059 return log_oom();
1060
1061 memcpy(addresses + n_addresses, da, n * sizeof(struct in_addr));
1062 n_addresses += n;
1063 }
1064 }
1065
1066 if (n_addresses <= 0)
1067 return 0;
1068
1069 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1070 }
1071
1072 static int link_set_bridge_fdb(Link *link) {
1073 FdbEntry *fdb_entry;
1074 int r;
1075
1076 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1077 r = fdb_entry_configure(link, fdb_entry);
1078 if (r < 0)
1079 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1080 }
1081
1082 return 0;
1083 }
1084
1085 static int link_enter_set_addresses(Link *link) {
1086 AddressLabel *label;
1087 Address *ad;
1088 int r;
1089
1090 assert(link);
1091 assert(link->network);
1092 assert(link->state != _LINK_STATE_INVALID);
1093
1094 r = link_set_bridge_fdb(link);
1095 if (r < 0)
1096 return r;
1097
1098 link_set_state(link, LINK_STATE_SETTING_ADDRESSES);
1099
1100 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1101 r = address_configure(ad, link, address_handler, false);
1102 if (r < 0) {
1103 log_link_warning_errno(link, r, "Could not set addresses: %m");
1104 link_enter_failed(link);
1105 return r;
1106 }
1107
1108 link->address_messages++;
1109 }
1110
1111 LIST_FOREACH(labels, label, link->network->address_labels) {
1112 r = address_label_configure(label, link, address_label_handler, false);
1113 if (r < 0) {
1114 log_link_warning_errno(link, r, "Could not set address label: %m");
1115 link_enter_failed(link);
1116 return r;
1117 }
1118
1119 link->address_label_messages++;
1120 }
1121
1122 /* now that we can figure out a default address for the dhcp server,
1123 start it */
1124 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1125 Address *address;
1126 Link *uplink = NULL;
1127 bool acquired_uplink = false;
1128
1129 address = link_find_dhcp_server_address(link);
1130 if (!address) {
1131 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1132 link_enter_failed(link);
1133 return 0;
1134 }
1135
1136 /* use the server address' subnet as the pool */
1137 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1138 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1139 if (r < 0)
1140 return r;
1141
1142 /* TODO:
1143 r = sd_dhcp_server_set_router(link->dhcp_server,
1144 &main_address->in_addr.in);
1145 if (r < 0)
1146 return r;
1147 */
1148
1149 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1150 r = sd_dhcp_server_set_max_lease_time(
1151 link->dhcp_server,
1152 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1153 if (r < 0)
1154 return r;
1155 }
1156
1157 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1158 r = sd_dhcp_server_set_default_lease_time(
1159 link->dhcp_server,
1160 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1161 if (r < 0)
1162 return r;
1163 }
1164
1165 if (link->network->dhcp_server_emit_dns) {
1166
1167 if (link->network->n_dhcp_server_dns > 0)
1168 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1169 else {
1170 uplink = manager_find_uplink(link->manager, link);
1171 acquired_uplink = true;
1172
1173 if (!uplink) {
1174 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1175 r = 0;
1176 } else
1177 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1178 }
1179 if (r < 0)
1180 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1181 }
1182
1183 if (link->network->dhcp_server_emit_ntp) {
1184
1185 if (link->network->n_dhcp_server_ntp > 0)
1186 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1187 else {
1188 if (!acquired_uplink)
1189 uplink = manager_find_uplink(link->manager, link);
1190
1191 if (!uplink) {
1192 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1193 r = 0;
1194 } else
1195 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1196
1197 }
1198 if (r < 0)
1199 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1200 }
1201
1202 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1203 if (r < 0)
1204 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1205
1206 if (link->network->dhcp_server_emit_timezone) {
1207 _cleanup_free_ char *buffer = NULL;
1208 const char *tz = NULL;
1209
1210 if (link->network->dhcp_server_timezone)
1211 tz = link->network->dhcp_server_timezone;
1212 else {
1213 r = get_timezone(&buffer);
1214 if (r < 0)
1215 log_warning_errno(r, "Failed to determine timezone: %m");
1216 else
1217 tz = buffer;
1218 }
1219
1220 if (tz) {
1221 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1222 if (r < 0)
1223 return r;
1224 }
1225 }
1226
1227 r = sd_dhcp_server_start(link->dhcp_server);
1228 if (r < 0) {
1229 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1230
1231 link_enter_failed(link);
1232
1233 return 0;
1234 }
1235
1236 log_link_debug(link, "Offering DHCPv4 leases");
1237 }
1238
1239 if (link->address_messages == 0)
1240 link_enter_set_routes(link);
1241 else
1242 log_link_debug(link, "Setting addresses");
1243
1244 return 0;
1245 }
1246
1247 int link_address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1248 Link *link = userdata;
1249 int r;
1250
1251 assert(m);
1252 assert(link);
1253 assert(link->ifname);
1254
1255 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1256 return 1;
1257
1258 r = sd_netlink_message_get_errno(m);
1259 if (r < 0 && r != -EADDRNOTAVAIL)
1260 log_link_warning_errno(link, r, "Could not drop address: %m");
1261
1262 return 1;
1263 }
1264
1265 static int link_set_bridge_vlan(Link *link) {
1266 int r = 0;
1267
1268 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1269 if (r < 0)
1270 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1271
1272 return r;
1273 }
1274
1275 static int link_set_proxy_arp(Link *link) {
1276 const char *p = NULL;
1277 int r;
1278
1279 if (!link_proxy_arp_enabled(link))
1280 return 0;
1281
1282 p = strjoina("/proc/sys/net/ipv4/conf/", link->ifname, "/proxy_arp");
1283
1284 r = write_string_file(p, one_zero(link->network->proxy_arp), WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
1285 if (r < 0)
1286 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1287
1288 return 0;
1289 }
1290
1291 static int link_set_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1292 Link *link = userdata;
1293 int r;
1294
1295 assert(link);
1296
1297 log_link_debug(link, "Set link");
1298
1299 r = sd_netlink_message_get_errno(m);
1300 if (r < 0 && r != -EEXIST) {
1301 log_link_error_errno(link, r, "Could not join netdev: %m");
1302 link_enter_failed(link);
1303 }
1304
1305 return 1;
1306 }
1307
1308 static int link_configure_after_setting_mtu(Link *link);
1309
1310 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1311 Link *link = userdata;
1312 int r;
1313
1314 assert(m);
1315 assert(link);
1316 assert(link->ifname);
1317
1318 link->setting_mtu = false;
1319
1320 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1321 return 1;
1322
1323 r = sd_netlink_message_get_errno(m);
1324 if (r < 0) {
1325 log_link_warning_errno(link, r, "Could not set MTU: %m");
1326 return 1;
1327 }
1328
1329 log_link_debug(link, "Setting MTU done.");
1330
1331 if (link->state == LINK_STATE_PENDING)
1332 (void) link_configure_after_setting_mtu(link);
1333
1334 return 1;
1335 }
1336
1337 int link_set_mtu(Link *link, uint32_t mtu) {
1338 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1339 int r;
1340
1341 assert(link);
1342 assert(link->manager);
1343 assert(link->manager->rtnl);
1344
1345 if (link->mtu == mtu || link->setting_mtu)
1346 return 0;
1347
1348 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1349
1350 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1351 if (r < 0)
1352 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1353
1354 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1355 * for this interface, or if it is a bridge slave, then disable IPv6 else enable it. */
1356 (void) link_enable_ipv6(link);
1357
1358 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1359 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1360 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1361
1362 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1363 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1364
1365 mtu = IPV6_MIN_MTU;
1366 }
1367
1368 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1369 if (r < 0)
1370 return log_link_error_errno(link, r, "Could not append MTU: %m");
1371
1372 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1373 link_netlink_destroy_callback, link, 0, __func__);
1374 if (r < 0)
1375 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1376
1377 link_ref(link);
1378 link->setting_mtu = true;
1379
1380 return 0;
1381 }
1382
1383 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1384 Link *link = userdata;
1385 int r;
1386
1387 assert(m);
1388 assert(link);
1389 assert(link->ifname);
1390
1391 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1392 return 1;
1393
1394 r = sd_netlink_message_get_errno(m);
1395 if (r < 0)
1396 log_link_warning_errno(link, r, "Could not set link flags: %m");
1397
1398 return 1;
1399 }
1400
1401 static int link_set_flags(Link *link) {
1402 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1403 unsigned ifi_change = 0;
1404 unsigned ifi_flags = 0;
1405 int r;
1406
1407 assert(link);
1408 assert(link->manager);
1409 assert(link->manager->rtnl);
1410
1411 if (link->flags & IFF_LOOPBACK)
1412 return 0;
1413
1414 if (!link->network)
1415 return 0;
1416
1417 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1418 return 0;
1419
1420 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1421 if (r < 0)
1422 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1423
1424 if (link->network->arp >= 0) {
1425 ifi_change |= IFF_NOARP;
1426 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1427 }
1428
1429 if (link->network->multicast >= 0) {
1430 ifi_change |= IFF_MULTICAST;
1431 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1432 }
1433
1434 if (link->network->allmulticast >= 0) {
1435 ifi_change |= IFF_ALLMULTI;
1436 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1437 }
1438
1439 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1440 if (r < 0)
1441 return log_link_error_errno(link, r, "Could not set link flags: %m");
1442
1443 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1444 link_netlink_destroy_callback, link, 0, __func__);
1445 if (r < 0)
1446 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1447
1448 link_ref(link);
1449
1450 return 0;
1451 }
1452
1453 static int link_set_bridge(Link *link) {
1454 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1455 int r;
1456
1457 assert(link);
1458 assert(link->network);
1459
1460 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1461 if (r < 0)
1462 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1463
1464 r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
1465 if (r < 0)
1466 return log_link_error_errno(link, r, "Could not set message family: %m");
1467
1468 r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
1469 if (r < 0)
1470 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1471
1472 if (link->network->use_bpdu >= 0) {
1473 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
1474 if (r < 0)
1475 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
1476 }
1477
1478 if (link->network->hairpin >= 0) {
1479 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
1480 if (r < 0)
1481 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
1482 }
1483
1484 if (link->network->fast_leave >= 0) {
1485 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave);
1486 if (r < 0)
1487 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
1488 }
1489
1490 if (link->network->allow_port_to_be_root >= 0) {
1491 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, link->network->allow_port_to_be_root);
1492 if (r < 0)
1493 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
1494
1495 }
1496
1497 if (link->network->unicast_flood >= 0) {
1498 r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood);
1499 if (r < 0)
1500 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
1501
1502 }
1503
1504 if (link->network->cost != 0) {
1505 r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
1506 if (r < 0)
1507 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
1508 }
1509 if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) {
1510 r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority);
1511 if (r < 0)
1512 return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
1513 }
1514
1515 r = sd_netlink_message_close_container(req);
1516 if (r < 0)
1517 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1518
1519 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, link_set_handler,
1520 link_netlink_destroy_callback, link, 0, __func__);
1521 if (r < 0)
1522 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1523
1524 link_ref(link);
1525
1526 return r;
1527 }
1528
1529 static int link_bond_set(Link *link) {
1530 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1531 int r;
1532
1533 assert(link);
1534 assert(link->network);
1535
1536 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_NEWLINK, link->network->bond->ifindex);
1537 if (r < 0)
1538 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1539
1540 r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
1541 if (r < 0)
1542 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1543
1544 r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
1545 if (r < 0)
1546 return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");
1547
1548 r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond");
1549 if (r < 0)
1550 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1551
1552 if (link->network->active_slave) {
1553 r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex);
1554 if (r < 0)
1555 return log_link_error_errno(link, r, "Could not append IFLA_BOND_ACTIVE_SLAVE attribute: %m");
1556 }
1557
1558 if (link->network->primary_slave) {
1559 r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex);
1560 if (r < 0)
1561 return log_link_error_errno(link, r, "Could not append IFLA_BOND_PRIMARY attribute: %m");
1562 }
1563
1564 r = sd_netlink_message_close_container(req);
1565 if (r < 0)
1566 return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");
1567
1568 r = sd_netlink_message_close_container(req);
1569 if (r < 0)
1570 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1571
1572 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1573 link_netlink_destroy_callback, link, 0, __func__);
1574 if (r < 0)
1575 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1576
1577 link_ref(link);
1578
1579 return r;
1580 }
1581
1582 static int link_lldp_save(Link *link) {
1583 _cleanup_free_ char *temp_path = NULL;
1584 _cleanup_fclose_ FILE *f = NULL;
1585 sd_lldp_neighbor **l = NULL;
1586 int n = 0, r, i;
1587
1588 assert(link);
1589 assert(link->lldp_file);
1590
1591 if (!link->lldp) {
1592 (void) unlink(link->lldp_file);
1593 return 0;
1594 }
1595
1596 r = sd_lldp_get_neighbors(link->lldp, &l);
1597 if (r < 0)
1598 goto finish;
1599 if (r == 0) {
1600 (void) unlink(link->lldp_file);
1601 goto finish;
1602 }
1603
1604 n = r;
1605
1606 r = fopen_temporary(link->lldp_file, &f, &temp_path);
1607 if (r < 0)
1608 goto finish;
1609
1610 fchmod(fileno(f), 0644);
1611
1612 for (i = 0; i < n; i++) {
1613 const void *p;
1614 le64_t u;
1615 size_t sz;
1616
1617 r = sd_lldp_neighbor_get_raw(l[i], &p, &sz);
1618 if (r < 0)
1619 goto finish;
1620
1621 u = htole64(sz);
1622 (void) fwrite(&u, 1, sizeof(u), f);
1623 (void) fwrite(p, 1, sz, f);
1624 }
1625
1626 r = fflush_and_check(f);
1627 if (r < 0)
1628 goto finish;
1629
1630 if (rename(temp_path, link->lldp_file) < 0) {
1631 r = -errno;
1632 goto finish;
1633 }
1634
1635 finish:
1636 if (r < 0) {
1637 (void) unlink(link->lldp_file);
1638 if (temp_path)
1639 (void) unlink(temp_path);
1640
1641 log_link_error_errno(link, r, "Failed to save LLDP data to %s: %m", link->lldp_file);
1642 }
1643
1644 if (l) {
1645 for (i = 0; i < n; i++)
1646 sd_lldp_neighbor_unref(l[i]);
1647 free(l);
1648 }
1649
1650 return r;
1651 }
1652
1653 static void lldp_handler(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata) {
1654 Link *link = userdata;
1655 int r;
1656
1657 assert(link);
1658
1659 (void) link_lldp_save(link);
1660
1661 if (link_lldp_emit_enabled(link) && event == SD_LLDP_EVENT_ADDED) {
1662 /* If we received information about a new neighbor, restart the LLDP "fast" logic */
1663
1664 log_link_debug(link, "Received LLDP datagram from previously unknown neighbor, restarting 'fast' LLDP transmission.");
1665
1666 r = link_lldp_emit_start(link);
1667 if (r < 0)
1668 log_link_warning_errno(link, r, "Failed to restart LLDP transmission: %m");
1669 }
1670 }
1671
1672 static int link_acquire_ipv6_conf(Link *link) {
1673 int r;
1674
1675 assert(link);
1676
1677 if (link_ipv6_accept_ra_enabled(link)) {
1678 assert(link->ndisc);
1679
1680 log_link_debug(link, "Discovering IPv6 routers");
1681
1682 r = sd_ndisc_start(link->ndisc);
1683 if (r < 0 && r != -EBUSY)
1684 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1685 }
1686
1687 if (link_radv_enabled(link)) {
1688 assert(link->radv);
1689 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1690
1691 log_link_debug(link, "Starting IPv6 Router Advertisements");
1692
1693 r = sd_radv_start(link->radv);
1694 if (r < 0 && r != -EBUSY)
1695 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1696 }
1697
1698 (void) dhcp6_request_prefix_delegation(link);
1699
1700 return 0;
1701 }
1702
1703 static int link_acquire_ipv4_conf(Link *link) {
1704 int r;
1705
1706 assert(link);
1707 assert(link->network);
1708 assert(link->manager);
1709 assert(link->manager->event);
1710
1711 if (link_ipv4ll_enabled(link)) {
1712 assert(link->ipv4ll);
1713
1714 log_link_debug(link, "Acquiring IPv4 link-local address");
1715
1716 r = sd_ipv4ll_start(link->ipv4ll);
1717 if (r < 0)
1718 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1719 }
1720
1721 if (link_dhcp4_enabled(link)) {
1722 assert(link->dhcp_client);
1723
1724 log_link_debug(link, "Acquiring DHCPv4 lease");
1725
1726 r = sd_dhcp_client_start(link->dhcp_client);
1727 if (r < 0)
1728 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1729 }
1730
1731 return 0;
1732 }
1733
1734 static int link_acquire_conf(Link *link) {
1735 int r;
1736
1737 assert(link);
1738
1739 r = link_acquire_ipv4_conf(link);
1740 if (r < 0)
1741 return r;
1742
1743 if (in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address) == 0) {
1744 r = link_acquire_ipv6_conf(link);
1745 if (r < 0)
1746 return r;
1747 }
1748
1749 if (link_lldp_emit_enabled(link)) {
1750 r = link_lldp_emit_start(link);
1751 if (r < 0)
1752 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1753 }
1754
1755 return 0;
1756 }
1757
1758 bool link_has_carrier(Link *link) {
1759 /* see Documentation/networking/operstates.txt in the kernel sources */
1760
1761 if (link->kernel_operstate == IF_OPER_UP)
1762 return true;
1763
1764 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1765 /* operstate may not be implemented, so fall back to flags */
1766 if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
1767 return true;
1768
1769 return false;
1770 }
1771
1772 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
1773 Link *link = userdata;
1774 int r;
1775
1776 assert(link);
1777
1778 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1779 return 1;
1780
1781 r = sd_netlink_message_get_errno(m);
1782 if (r < 0)
1783 /* we warn but don't fail the link, as it may be brought up later */
1784 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1785
1786 return 1;
1787 }
1788
1789 int link_up(Link *link) {
1790 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1791 uint8_t ipv6ll_mode;
1792 int r;
1793
1794 assert(link);
1795 assert(link->network);
1796 assert(link->manager);
1797 assert(link->manager->rtnl);
1798
1799 log_link_debug(link, "Bringing link up");
1800
1801 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1802 if (r < 0)
1803 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1804
1805 /* set it free if not enslaved with networkd */
1806 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1807 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1808 if (r < 0)
1809 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1810 }
1811
1812 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1813 if (r < 0)
1814 return log_link_error_errno(link, r, "Could not set link flags: %m");
1815
1816 if (link->network->mac) {
1817 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1818 if (r < 0)
1819 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1820 }
1821
1822 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1823 if (r < 0)
1824 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1825
1826 if (link_ipv6_enabled(link)) {
1827 /* if the kernel lacks ipv6 support setting IFF_UP fails if any ipv6 options are passed */
1828 r = sd_netlink_message_open_container(req, AF_INET6);
1829 if (r < 0)
1830 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1831
1832 if (!link_ipv6ll_enabled(link))
1833 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1834 else {
1835 const char *p = NULL;
1836 _cleanup_free_ char *stable_secret = NULL;
1837
1838 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/stable_secret");
1839 r = read_one_line_file(p, &stable_secret);
1840
1841 if (r < 0)
1842 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1843 else
1844 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1845 }
1846 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1847 if (r < 0)
1848 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1849
1850 if (!in_addr_is_null(AF_INET6, &link->network->ipv6_token)) {
1851 r = sd_netlink_message_append_in6_addr(req, IFLA_INET6_TOKEN, &link->network->ipv6_token.in6);
1852 if (r < 0)
1853 return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m");
1854 }
1855
1856 r = sd_netlink_message_close_container(req);
1857 if (r < 0)
1858 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1859 }
1860
1861 r = sd_netlink_message_close_container(req);
1862 if (r < 0)
1863 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1864
1865 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1866 link_netlink_destroy_callback, link, 0, __func__);
1867 if (r < 0)
1868 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1869
1870 link_ref(link);
1871
1872 return 0;
1873 }
1874
1875 static int link_up_can(Link *link) {
1876 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1877 int r;
1878
1879 assert(link);
1880
1881 log_link_debug(link, "Bringing CAN link up");
1882
1883 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1884 if (r < 0)
1885 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1886
1887 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1888 if (r < 0)
1889 return log_link_error_errno(link, r, "Could not set link flags: %m");
1890
1891 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1892 link_netlink_destroy_callback, link, 0, __func__);
1893 if (r < 0)
1894 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1895
1896 link_ref(link);
1897
1898 return 0;
1899 }
1900
1901 static int link_set_can(Link *link) {
1902 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
1903 int r;
1904
1905 assert(link);
1906 assert(link->network);
1907 assert(link->manager);
1908 assert(link->manager->rtnl);
1909
1910 log_link_debug(link, "link_set_can");
1911
1912 r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex);
1913 if (r < 0)
1914 return log_link_error_errno(link, r, "Failed to allocate netlink message: %m");
1915
1916 r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK);
1917 if (r < 0)
1918 return log_link_error_errno(link, r, "Could not set netlink flags: %m");
1919
1920 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
1921 if (r < 0)
1922 return log_link_error_errno(link, r, "Failed to open netlink container: %m");
1923
1924 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, link->kind);
1925 if (r < 0)
1926 return log_link_error_errno(link, r, "Could not append IFLA_INFO_DATA attribute: %m");
1927
1928 if (link->network->can_bitrate > 0 || link->network->can_sample_point > 0) {
1929 struct can_bittiming bt = {
1930 .bitrate = link->network->can_bitrate,
1931 .sample_point = link->network->can_sample_point,
1932 };
1933
1934 if (link->network->can_bitrate > UINT32_MAX) {
1935 log_link_error(link, "bitrate (%zu) too big.", link->network->can_bitrate);
1936 return -ERANGE;
1937 }
1938
1939 log_link_debug(link, "Setting bitrate = %d bit/s", bt.bitrate);
1940 if (link->network->can_sample_point > 0)
1941 log_link_debug(link, "Setting sample point = %d.%d%%", bt.sample_point / 10, bt.sample_point % 10);
1942 else
1943 log_link_debug(link, "Using default sample point");
1944
1945 r = sd_netlink_message_append_data(m, IFLA_CAN_BITTIMING, &bt, sizeof(bt));
1946 if (r < 0)
1947 return log_link_error_errno(link, r, "Could not append IFLA_CAN_BITTIMING attribute: %m");
1948 }
1949
1950 if (link->network->can_restart_us > 0) {
1951 char time_string[FORMAT_TIMESPAN_MAX];
1952 uint64_t restart_ms;
1953
1954 if (link->network->can_restart_us == USEC_INFINITY)
1955 restart_ms = 0;
1956 else
1957 restart_ms = DIV_ROUND_UP(link->network->can_restart_us, USEC_PER_MSEC);
1958
1959 format_timespan(time_string, FORMAT_TIMESPAN_MAX, restart_ms * 1000, MSEC_PER_SEC);
1960
1961 if (restart_ms > UINT32_MAX) {
1962 log_link_error(link, "restart timeout (%s) too big.", time_string);
1963 return -ERANGE;
1964 }
1965
1966 log_link_debug(link, "Setting restart = %s", time_string);
1967
1968 r = sd_netlink_message_append_u32(m, IFLA_CAN_RESTART_MS, restart_ms);
1969 if (r < 0)
1970 return log_link_error_errno(link, r, "Could not append IFLA_CAN_RESTART_MS attribute: %m");
1971 }
1972
1973 r = sd_netlink_message_close_container(m);
1974 if (r < 0)
1975 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
1976
1977 r = sd_netlink_message_close_container(m);
1978 if (r < 0)
1979 return log_link_error_errno(link, r, "Failed to close netlink container: %m");
1980
1981 r = sd_netlink_call_async(link->manager->rtnl, NULL, m, link_set_handler,
1982 link_netlink_destroy_callback, link, 0, __func__);
1983 if (r < 0)
1984 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1985
1986 link_ref(link);
1987
1988 if (!(link->flags & IFF_UP)) {
1989 r = link_up_can(link);
1990 if (r < 0) {
1991 link_enter_failed(link);
1992 return r;
1993 }
1994 }
1995
1996 log_link_debug(link, "link_set_can done");
1997
1998 return r;
1999 }
2000
2001 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
2002 Link *link = userdata;
2003 int r;
2004
2005 assert(link);
2006
2007 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2008 return 1;
2009
2010 r = sd_netlink_message_get_errno(m);
2011 if (r < 0)
2012 log_link_warning_errno(link, r, "Could not bring down interface: %m");
2013
2014 if (streq_ptr(link->kind, "can"))
2015 link_set_can(link);
2016
2017 return 1;
2018 }
2019
2020 int link_down(Link *link) {
2021 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2022 int r;
2023
2024 assert(link);
2025 assert(link->manager);
2026 assert(link->manager->rtnl);
2027
2028 log_link_debug(link, "Bringing link down");
2029
2030 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
2031 RTM_SETLINK, link->ifindex);
2032 if (r < 0)
2033 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2034
2035 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
2036 if (r < 0)
2037 return log_link_error_errno(link, r, "Could not set link flags: %m");
2038
2039 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, link_down_handler,
2040 link_netlink_destroy_callback, link, 0, __func__);
2041 if (r < 0)
2042 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2043
2044 link_ref(link);
2045
2046 return 0;
2047 }
2048
2049 static int link_handle_bound_to_list(Link *link) {
2050 Link *l;
2051 Iterator i;
2052 int r;
2053 bool required_up = false;
2054 bool link_is_up = false;
2055
2056 assert(link);
2057
2058 if (hashmap_isempty(link->bound_to_links))
2059 return 0;
2060
2061 if (link->flags & IFF_UP)
2062 link_is_up = true;
2063
2064 HASHMAP_FOREACH (l, link->bound_to_links, i)
2065 if (link_has_carrier(l)) {
2066 required_up = true;
2067 break;
2068 }
2069
2070 if (!required_up && link_is_up) {
2071 r = link_down(link);
2072 if (r < 0)
2073 return r;
2074 } else if (required_up && !link_is_up) {
2075 r = link_up(link);
2076 if (r < 0)
2077 return r;
2078 }
2079
2080 return 0;
2081 }
2082
2083 static int link_handle_bound_by_list(Link *link) {
2084 Iterator i;
2085 Link *l;
2086 int r;
2087
2088 assert(link);
2089
2090 if (hashmap_isempty(link->bound_by_links))
2091 return 0;
2092
2093 HASHMAP_FOREACH (l, link->bound_by_links, i) {
2094 r = link_handle_bound_to_list(l);
2095 if (r < 0)
2096 return r;
2097 }
2098
2099 return 0;
2100 }
2101
2102 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2103 int r;
2104
2105 assert(link);
2106 assert(carrier);
2107
2108 if (link == carrier)
2109 return 0;
2110
2111 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2112 return 0;
2113
2114 r = hashmap_ensure_allocated(h, NULL);
2115 if (r < 0)
2116 return r;
2117
2118 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2119 if (r < 0)
2120 return r;
2121
2122 return 0;
2123 }
2124
2125 static int link_new_bound_by_list(Link *link) {
2126 Manager *m;
2127 Link *carrier;
2128 Iterator i;
2129 int r;
2130 bool list_updated = false;
2131
2132 assert(link);
2133 assert(link->manager);
2134
2135 m = link->manager;
2136
2137 HASHMAP_FOREACH(carrier, m->links, i) {
2138 if (!carrier->network)
2139 continue;
2140
2141 if (strv_isempty(carrier->network->bind_carrier))
2142 continue;
2143
2144 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
2145 r = link_put_carrier(link, carrier, &link->bound_by_links);
2146 if (r < 0)
2147 return r;
2148
2149 list_updated = true;
2150 }
2151 }
2152
2153 if (list_updated)
2154 link_dirty(link);
2155
2156 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2157 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2158 if (r < 0)
2159 return r;
2160
2161 link_dirty(carrier);
2162 }
2163
2164 return 0;
2165 }
2166
2167 static int link_new_bound_to_list(Link *link) {
2168 Manager *m;
2169 Link *carrier;
2170 Iterator i;
2171 int r;
2172 bool list_updated = false;
2173
2174 assert(link);
2175 assert(link->manager);
2176
2177 if (!link->network)
2178 return 0;
2179
2180 if (strv_isempty(link->network->bind_carrier))
2181 return 0;
2182
2183 m = link->manager;
2184
2185 HASHMAP_FOREACH (carrier, m->links, i) {
2186 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2187 r = link_put_carrier(link, carrier, &link->bound_to_links);
2188 if (r < 0)
2189 return r;
2190
2191 list_updated = true;
2192 }
2193 }
2194
2195 if (list_updated)
2196 link_dirty(link);
2197
2198 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2199 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2200 if (r < 0)
2201 return r;
2202
2203 link_dirty(carrier);
2204 }
2205
2206 return 0;
2207 }
2208
2209 static int link_new_carrier_maps(Link *link) {
2210 int r;
2211
2212 r = link_new_bound_by_list(link);
2213 if (r < 0)
2214 return r;
2215
2216 r = link_handle_bound_by_list(link);
2217 if (r < 0)
2218 return r;
2219
2220 r = link_new_bound_to_list(link);
2221 if (r < 0)
2222 return r;
2223
2224 r = link_handle_bound_to_list(link);
2225 if (r < 0)
2226 return r;
2227
2228 return 0;
2229 }
2230
2231 static void link_free_bound_to_list(Link *link) {
2232 Link *bound_to;
2233 Iterator i;
2234
2235 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2236 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2237
2238 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2239 link_dirty(bound_to);
2240 }
2241
2242 return;
2243 }
2244
2245 static void link_free_bound_by_list(Link *link) {
2246 Link *bound_by;
2247 Iterator i;
2248
2249 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2250 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2251
2252 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2253 link_dirty(bound_by);
2254 link_handle_bound_to_list(bound_by);
2255 }
2256 }
2257
2258 return;
2259 }
2260
2261 static void link_free_carrier_maps(Link *link) {
2262 bool list_updated = false;
2263
2264 assert(link);
2265
2266 if (!hashmap_isempty(link->bound_to_links)) {
2267 link_free_bound_to_list(link);
2268 list_updated = true;
2269 }
2270
2271 if (!hashmap_isempty(link->bound_by_links)) {
2272 link_free_bound_by_list(link);
2273 list_updated = true;
2274 }
2275
2276 if (list_updated)
2277 link_dirty(link);
2278
2279 return;
2280 }
2281
2282 void link_drop(Link *link) {
2283 if (!link || link->state == LINK_STATE_LINGER)
2284 return;
2285
2286 link_set_state(link, LINK_STATE_LINGER);
2287
2288 link_free_carrier_maps(link);
2289
2290 log_link_debug(link, "Link removed");
2291
2292 (void) unlink(link->state_file);
2293
2294 link_detach_from_manager(link);
2295
2296 link_unref(link);
2297
2298 return;
2299 }
2300
2301 static int link_joined(Link *link) {
2302 int r;
2303
2304 assert(link);
2305 assert(link->network);
2306
2307 if (!hashmap_isempty(link->bound_to_links)) {
2308 r = link_handle_bound_to_list(link);
2309 if (r < 0)
2310 return r;
2311 } else if (!(link->flags & IFF_UP)) {
2312 r = link_up(link);
2313 if (r < 0) {
2314 link_enter_failed(link);
2315 return r;
2316 }
2317 }
2318
2319 if (link->network->bridge) {
2320 r = link_set_bridge(link);
2321 if (r < 0)
2322 log_link_error_errno(link, r, "Could not set bridge message: %m");
2323 }
2324
2325 if (link->network->bond) {
2326 r = link_bond_set(link);
2327 if (r < 0)
2328 log_link_error_errno(link, r, "Could not set bond message: %m");
2329 }
2330
2331 if (link->network->use_br_vlan &&
2332 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2333 r = link_set_bridge_vlan(link);
2334 if (r < 0)
2335 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2336 }
2337
2338 /* Skip setting up addresses until it gets carrier,
2339 or it would try to set addresses twice,
2340 which is bad for non-idempotent steps. */
2341 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2342 return 0;
2343
2344 return link_enter_set_addresses(link);
2345 }
2346
2347 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
2348 Link *link = userdata;
2349 int r;
2350
2351 assert(link);
2352 assert(link->network);
2353
2354 link->enslaving--;
2355
2356 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2357 return 1;
2358
2359 r = sd_netlink_message_get_errno(m);
2360 if (r < 0 && r != -EEXIST) {
2361 log_link_error_errno(link, r, "Could not join netdev: %m");
2362 link_enter_failed(link);
2363 return 1;
2364 } else
2365 log_link_debug(link, "Joined netdev");
2366
2367 if (link->enslaving <= 0)
2368 link_joined(link);
2369
2370 return 1;
2371 }
2372
2373 static int link_enter_join_netdev(Link *link) {
2374 NetDev *netdev;
2375 Iterator i;
2376 int r;
2377
2378 assert(link);
2379 assert(link->network);
2380 assert(link->state == LINK_STATE_PENDING);
2381
2382 link_set_state(link, LINK_STATE_ENSLAVING);
2383
2384 link_dirty(link);
2385
2386 if (!link->network->bridge &&
2387 !link->network->bond &&
2388 !link->network->vrf &&
2389 hashmap_isempty(link->network->stacked_netdevs))
2390 return link_joined(link);
2391
2392 if (link->network->bond) {
2393 if (link->network->bond->state == NETDEV_STATE_READY &&
2394 link->network->bond->ifindex == link->master_ifindex)
2395 return link_joined(link);
2396
2397 log_struct(LOG_DEBUG,
2398 LOG_LINK_INTERFACE(link),
2399 LOG_NETDEV_INTERFACE(link->network->bond),
2400 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2401
2402 r = netdev_join(link->network->bond, link, netdev_join_handler);
2403 if (r < 0) {
2404 log_struct_errno(LOG_WARNING, r,
2405 LOG_LINK_INTERFACE(link),
2406 LOG_NETDEV_INTERFACE(link->network->bond),
2407 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2408 link_enter_failed(link);
2409 return r;
2410 }
2411
2412 link->enslaving++;
2413 }
2414
2415 if (link->network->bridge) {
2416 log_struct(LOG_DEBUG,
2417 LOG_LINK_INTERFACE(link),
2418 LOG_NETDEV_INTERFACE(link->network->bridge),
2419 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2420
2421 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2422 if (r < 0) {
2423 log_struct_errno(LOG_WARNING, r,
2424 LOG_LINK_INTERFACE(link),
2425 LOG_NETDEV_INTERFACE(link->network->bridge),
2426 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2427 link_enter_failed(link);
2428 return r;
2429 }
2430
2431 link->enslaving++;
2432 }
2433
2434 if (link->network->vrf) {
2435 log_struct(LOG_DEBUG,
2436 LOG_LINK_INTERFACE(link),
2437 LOG_NETDEV_INTERFACE(link->network->vrf),
2438 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2439
2440 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2441 if (r < 0) {
2442 log_struct_errno(LOG_WARNING, r,
2443 LOG_LINK_INTERFACE(link),
2444 LOG_NETDEV_INTERFACE(link->network->vrf),
2445 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2446 link_enter_failed(link);
2447 return r;
2448 }
2449
2450 link->enslaving++;
2451 }
2452
2453 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2454
2455 if (netdev->ifindex > 0) {
2456 link_joined(link);
2457 continue;
2458 }
2459
2460 log_struct(LOG_DEBUG,
2461 LOG_LINK_INTERFACE(link),
2462 LOG_NETDEV_INTERFACE(netdev),
2463 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2464
2465 r = netdev_join(netdev, link, netdev_join_handler);
2466 if (r < 0) {
2467 log_struct_errno(LOG_WARNING, r,
2468 LOG_LINK_INTERFACE(link),
2469 LOG_NETDEV_INTERFACE(netdev),
2470 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2471 link_enter_failed(link);
2472 return r;
2473 }
2474
2475 link->enslaving++;
2476 }
2477
2478 return 0;
2479 }
2480
2481 static int link_set_ipv4_forward(Link *link) {
2482 int r;
2483
2484 if (!link_ipv4_forward_enabled(link))
2485 return 0;
2486
2487 /* We propagate the forwarding flag from one interface to the
2488 * global setting one way. This means: as long as at least one
2489 * interface was configured at any time that had IP forwarding
2490 * enabled the setting will stay on for good. We do this
2491 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2492 * somewhat in sync (see below). */
2493
2494 r = write_string_file("/proc/sys/net/ipv4/ip_forward", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2495 if (r < 0)
2496 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2497
2498 return 0;
2499 }
2500
2501 static int link_set_ipv6_forward(Link *link) {
2502 int r;
2503
2504 if (!link_ipv6_forward_enabled(link))
2505 return 0;
2506
2507 /* On Linux, the IPv6 stack does not know a per-interface
2508 * packet forwarding setting: either packet forwarding is on
2509 * for all, or off for all. We hence don't bother with a
2510 * per-interface setting, but simply propagate the interface
2511 * flag, if it is set, to the global flag, one-way. Note that
2512 * while IPv4 would allow a per-interface flag, we expose the
2513 * same behaviour there and also propagate the setting from
2514 * one to all, to keep things simple (see above). */
2515
2516 r = write_string_file("/proc/sys/net/ipv6/conf/all/forwarding", "1", WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2517 if (r < 0)
2518 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2519
2520 return 0;
2521 }
2522
2523 static int link_set_ipv6_privacy_extensions(Link *link) {
2524 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2525 IPv6PrivacyExtensions s;
2526 const char *p = NULL;
2527 int r;
2528
2529 s = link_ipv6_privacy_extensions(link);
2530 if (s < 0)
2531 return 0;
2532
2533 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/use_tempaddr");
2534 xsprintf(buf, "%u", (unsigned) link->network->ipv6_privacy_extensions);
2535
2536 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2537 if (r < 0)
2538 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2539
2540 return 0;
2541 }
2542
2543 static int link_set_ipv6_accept_ra(Link *link) {
2544 const char *p = NULL;
2545 int r;
2546
2547 /* Make this a NOP if IPv6 is not available */
2548 if (!socket_ipv6_is_supported())
2549 return 0;
2550
2551 if (link->flags & IFF_LOOPBACK)
2552 return 0;
2553
2554 if (!link->network)
2555 return 0;
2556
2557 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/accept_ra");
2558
2559 /* We handle router advertisements ourselves, tell the kernel to GTFO */
2560 r = write_string_file(p, "0", WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2561 if (r < 0)
2562 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2563
2564 return 0;
2565 }
2566
2567 static int link_set_ipv6_dad_transmits(Link *link) {
2568 char buf[DECIMAL_STR_MAX(int) + 1];
2569 const char *p = NULL;
2570 int r;
2571
2572 /* Make this a NOP if IPv6 is not available */
2573 if (!socket_ipv6_is_supported())
2574 return 0;
2575
2576 if (link->flags & IFF_LOOPBACK)
2577 return 0;
2578
2579 if (!link->network)
2580 return 0;
2581
2582 if (link->network->ipv6_dad_transmits < 0)
2583 return 0;
2584
2585 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/dad_transmits");
2586 xsprintf(buf, "%i", link->network->ipv6_dad_transmits);
2587
2588 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2589 if (r < 0)
2590 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2591
2592 return 0;
2593 }
2594
2595 static int link_set_ipv6_hop_limit(Link *link) {
2596 char buf[DECIMAL_STR_MAX(int) + 1];
2597 const char *p = NULL;
2598 int r;
2599
2600 /* Make this a NOP if IPv6 is not available */
2601 if (!socket_ipv6_is_supported())
2602 return 0;
2603
2604 if (link->flags & IFF_LOOPBACK)
2605 return 0;
2606
2607 if (!link->network)
2608 return 0;
2609
2610 if (link->network->ipv6_hop_limit < 0)
2611 return 0;
2612
2613 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/hop_limit");
2614 xsprintf(buf, "%i", link->network->ipv6_hop_limit);
2615
2616 r = write_string_file(p, buf, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER);
2617 if (r < 0)
2618 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2619
2620 return 0;
2621 }
2622
2623 static int link_set_ipv6_mtu(Link *link) {
2624 char buf[DECIMAL_STR_MAX(unsigned) + 1];
2625 const char *p = NULL;
2626 int r;
2627
2628 /* Make this a NOP if IPv6 is not available */
2629 if (!socket_ipv6_is_supported())
2630 return 0;
2631
2632 if (link->flags & IFF_LOOPBACK)
2633 return 0;
2634
2635 if (link->network->ipv6_mtu == 0)
2636 return 0;
2637
2638 p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/mtu");
2639
2640 xsprintf(buf, "%" PRIu32, link->network->ipv6_mtu);
2641
2642 r = write_string_file(p, buf, WRITE_STRING_FILE_DISABLE_BUFFER);
2643 if (r < 0)
2644 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2645
2646 return 0;
2647 }
2648
2649 static bool link_is_static_address_configured(Link *link, Address *address) {
2650 Address *net_address;
2651
2652 assert(link);
2653 assert(address);
2654
2655 if (!link->network)
2656 return false;
2657
2658 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2659 if (address_equal(net_address, address))
2660 return true;
2661
2662 return false;
2663 }
2664
2665 static bool link_is_static_route_configured(Link *link, Route *route) {
2666 Route *net_route;
2667
2668 assert(link);
2669 assert(route);
2670
2671 if (!link->network)
2672 return false;
2673
2674 LIST_FOREACH(routes, net_route, link->network->static_routes)
2675 if (route_equal(net_route, route))
2676 return true;
2677
2678 return false;
2679 }
2680
2681 static int link_drop_foreign_config(Link *link) {
2682 Address *address;
2683 Route *route;
2684 Iterator i;
2685 int r;
2686
2687 SET_FOREACH(address, link->addresses_foreign, i) {
2688 /* we consider IPv6LL addresses to be managed by the kernel */
2689 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2690 continue;
2691
2692 if (link_is_static_address_configured(link, address)) {
2693 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2694 if (r < 0)
2695 return log_link_error_errno(link, r, "Failed to add address: %m");
2696 } else {
2697 r = address_remove(address, link, link_address_remove_handler);
2698 if (r < 0)
2699 return r;
2700 }
2701 }
2702
2703 SET_FOREACH(route, link->routes_foreign, i) {
2704 /* do not touch routes managed by the kernel */
2705 if (route->protocol == RTPROT_KERNEL)
2706 continue;
2707
2708 if (link_is_static_route_configured(link, route)) {
2709 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2710 if (r < 0)
2711 return r;
2712 } else {
2713 r = route_remove(route, link, link_route_remove_handler);
2714 if (r < 0)
2715 return r;
2716 }
2717 }
2718
2719 return 0;
2720 }
2721
2722 static int link_drop_config(Link *link) {
2723 Address *address, *pool_address;
2724 Route *route;
2725 Iterator i;
2726 int r;
2727
2728 SET_FOREACH(address, link->addresses, i) {
2729 /* we consider IPv6LL addresses to be managed by the kernel */
2730 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2731 continue;
2732
2733 r = address_remove(address, link, link_address_remove_handler);
2734 if (r < 0)
2735 return r;
2736
2737 /* If this address came from an address pool, clean up the pool */
2738 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2739 if (address_equal(address, pool_address)) {
2740 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2741 address_free(pool_address);
2742 break;
2743 }
2744 }
2745 }
2746
2747 SET_FOREACH(route, link->routes, i) {
2748 /* do not touch routes managed by the kernel */
2749 if (route->protocol == RTPROT_KERNEL)
2750 continue;
2751
2752 r = route_remove(route, link, link_route_remove_handler);
2753 if (r < 0)
2754 return r;
2755 }
2756
2757 ndisc_flush(link);
2758
2759 return 0;
2760 }
2761
2762 static int link_update_lldp(Link *link) {
2763 int r;
2764
2765 assert(link);
2766
2767 if (!link->lldp)
2768 return 0;
2769
2770 if (link->flags & IFF_UP) {
2771 r = sd_lldp_start(link->lldp);
2772 if (r > 0)
2773 log_link_debug(link, "Started LLDP.");
2774 } else {
2775 r = sd_lldp_stop(link->lldp);
2776 if (r > 0)
2777 log_link_debug(link, "Stopped LLDP.");
2778 }
2779
2780 return r;
2781 }
2782
2783 static int link_configure_can(Link *link) {
2784 int r;
2785
2786 if (streq_ptr(link->kind, "can")) {
2787 /* The CAN interface must be down to configure bitrate, etc... */
2788 if ((link->flags & IFF_UP)) {
2789 r = link_down(link);
2790 if (r < 0) {
2791 link_enter_failed(link);
2792 return r;
2793 }
2794
2795 return 0;
2796 }
2797
2798 return link_set_can(link);
2799 }
2800
2801 if (!(link->flags & IFF_UP)) {
2802 r = link_up_can(link);
2803 if (r < 0) {
2804 link_enter_failed(link);
2805 return r;
2806 }
2807 }
2808
2809 return 0;
2810 }
2811
2812 static int link_configure(Link *link) {
2813 int r;
2814
2815 assert(link);
2816 assert(link->network);
2817 assert(link->state == LINK_STATE_PENDING);
2818
2819 if (STRPTR_IN_SET(link->kind, "can", "vcan"))
2820 return link_configure_can(link);
2821
2822 /* Drop foreign config, but ignore loopback or critical devices.
2823 * We do not want to remove loopback address or addresses used for root NFS. */
2824 if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {
2825 r = link_drop_foreign_config(link);
2826 if (r < 0)
2827 return r;
2828 }
2829
2830 r = link_set_proxy_arp(link);
2831 if (r < 0)
2832 return r;
2833
2834 r = ipv6_proxy_ndp_addresses_configure(link);
2835 if (r < 0)
2836 return r;
2837
2838 r = link_set_ipv4_forward(link);
2839 if (r < 0)
2840 return r;
2841
2842 r = link_set_ipv6_forward(link);
2843 if (r < 0)
2844 return r;
2845
2846 r = link_set_ipv6_privacy_extensions(link);
2847 if (r < 0)
2848 return r;
2849
2850 r = link_set_ipv6_accept_ra(link);
2851 if (r < 0)
2852 return r;
2853
2854 r = link_set_ipv6_dad_transmits(link);
2855 if (r < 0)
2856 return r;
2857
2858 r = link_set_ipv6_hop_limit(link);
2859 if (r < 0)
2860 return r;
2861
2862 r = link_set_flags(link);
2863 if (r < 0)
2864 return r;
2865
2866 r = link_set_ipv6_mtu(link);
2867 if (r < 0)
2868 return r;
2869
2870 if (link_ipv4ll_enabled(link)) {
2871 r = ipv4ll_configure(link);
2872 if (r < 0)
2873 return r;
2874 }
2875
2876 if (link_dhcp4_enabled(link)) {
2877 r = dhcp4_set_promote_secondaries(link);
2878 if (r < 0)
2879 return r;
2880
2881 r = dhcp4_configure(link);
2882 if (r < 0)
2883 return r;
2884 }
2885
2886 if (link_dhcp4_server_enabled(link)) {
2887 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2888 if (r < 0)
2889 return r;
2890
2891 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2892 if (r < 0)
2893 return r;
2894 }
2895
2896 if (link_dhcp6_enabled(link) ||
2897 link_ipv6_accept_ra_enabled(link)) {
2898 r = dhcp6_configure(link);
2899 if (r < 0)
2900 return r;
2901 }
2902
2903 if (link_ipv6_accept_ra_enabled(link)) {
2904 r = ndisc_configure(link);
2905 if (r < 0)
2906 return r;
2907 }
2908
2909 if (link_radv_enabled(link)) {
2910 r = radv_configure(link);
2911 if (r < 0)
2912 return r;
2913 }
2914
2915 if (link_lldp_rx_enabled(link)) {
2916 r = sd_lldp_new(&link->lldp);
2917 if (r < 0)
2918 return r;
2919
2920 r = sd_lldp_set_ifindex(link->lldp, link->ifindex);
2921 if (r < 0)
2922 return r;
2923
2924 r = sd_lldp_match_capabilities(link->lldp,
2925 link->network->lldp_mode == LLDP_MODE_ROUTERS_ONLY ?
2926 SD_LLDP_SYSTEM_CAPABILITIES_ALL_ROUTERS :
2927 SD_LLDP_SYSTEM_CAPABILITIES_ALL);
2928 if (r < 0)
2929 return r;
2930
2931 r = sd_lldp_set_filter_address(link->lldp, &link->mac);
2932 if (r < 0)
2933 return r;
2934
2935 r = sd_lldp_attach_event(link->lldp, NULL, 0);
2936 if (r < 0)
2937 return r;
2938
2939 r = sd_lldp_set_callback(link->lldp, lldp_handler, link);
2940 if (r < 0)
2941 return r;
2942
2943 r = link_update_lldp(link);
2944 if (r < 0)
2945 return r;
2946 }
2947
2948 if (link->network->mtu > 0) {
2949 r = link_set_mtu(link, link->network->mtu);
2950 if (r < 0)
2951 return r;
2952 }
2953
2954 return link_configure_after_setting_mtu(link);
2955 }
2956
2957 static int link_configure_after_setting_mtu(Link *link) {
2958 int r;
2959
2960 assert(link);
2961 assert(link->network);
2962 assert(link->state == LINK_STATE_PENDING);
2963
2964 if (link->setting_mtu)
2965 return 0;
2966
2967 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2968 r = link_acquire_conf(link);
2969 if (r < 0)
2970 return r;
2971 }
2972
2973 return link_enter_join_netdev(link);
2974 }
2975
2976 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
2977 assert(duid);
2978
2979 if (duid->raw_data_len > 0)
2980 return 0;
2981
2982 if (duid->type != DUID_TYPE_UUID)
2983 return -EINVAL;
2984
2985 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
2986 duid->raw_data_len = sizeof(sd_id128_t);
2987
2988 return 1;
2989 }
2990
2991 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
2992 Manager *manager = userdata;
2993 const sd_bus_error *e;
2994 const void *a;
2995 size_t sz;
2996 DUID *duid;
2997 Link *link;
2998 int r;
2999
3000 assert(m);
3001 assert(manager);
3002
3003 e = sd_bus_message_get_error(m);
3004 if (e) {
3005 log_error_errno(sd_bus_error_get_errno(e),
3006 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3007 e->message);
3008 goto configure;
3009 }
3010
3011 r = sd_bus_message_read_array(m, 'y', &a, &sz);
3012 if (r < 0)
3013 goto configure;
3014
3015 if (sz != sizeof(sd_id128_t)) {
3016 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3017 goto configure;
3018 }
3019
3020 memcpy(&manager->product_uuid, a, sz);
3021 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3022 (void) duid_set_uuid(duid, manager->product_uuid);
3023
3024 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3025
3026 configure:
3027 while ((link = set_steal_first(manager->links_requesting_uuid))) {
3028 r = link_configure(link);
3029 if (r < 0)
3030 log_link_error_errno(link, r, "Failed to configure link: %m");
3031 }
3032
3033 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3034
3035 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3036 * even if the method fails. */
3037 manager->has_product_uuid = true;
3038
3039 return 1;
3040 }
3041
3042 static bool link_requires_uuid(Link *link) {
3043 const DUID *duid;
3044
3045 assert(link);
3046 assert(link->manager);
3047 assert(link->network);
3048
3049 duid = link_get_duid(link);
3050 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3051 return false;
3052
3053 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3054 return true;
3055
3056 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3057 return true;
3058
3059 return false;
3060 }
3061
3062 static int link_configure_duid(Link *link) {
3063 Manager *m;
3064 DUID *duid;
3065 int r;
3066
3067 assert(link);
3068 assert(link->manager);
3069 assert(link->network);
3070
3071 m = link->manager;
3072 duid = link_get_duid(link);
3073
3074 if (!link_requires_uuid(link))
3075 return 1;
3076
3077 if (m->has_product_uuid) {
3078 (void) duid_set_uuid(duid, m->product_uuid);
3079 return 1;
3080 }
3081
3082 if (!m->links_requesting_uuid) {
3083 r = manager_request_product_uuid(m, link);
3084 if (r < 0) {
3085 if (r == -ENOMEM)
3086 return r;
3087
3088 log_link_warning_errno(link, r,
3089 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3090 return 1;
3091 }
3092 } else {
3093 r = set_put(m->links_requesting_uuid, link);
3094 if (r < 0)
3095 return log_oom();
3096
3097 r = set_put(m->duids_requesting_uuid, duid);
3098 if (r < 0)
3099 return log_oom();
3100 }
3101
3102 return 0;
3103 }
3104
3105 static int link_initialized_and_synced(Link *link) {
3106 Network *network;
3107 int r;
3108
3109 assert(link);
3110 assert(link->ifname);
3111 assert(link->manager);
3112
3113 if (link->state != LINK_STATE_PENDING)
3114 return 1;
3115
3116 log_link_debug(link, "Link state is up-to-date");
3117
3118 r = link_new_bound_by_list(link);
3119 if (r < 0)
3120 return r;
3121
3122 r = link_handle_bound_by_list(link);
3123 if (r < 0)
3124 return r;
3125
3126 if (!link->network) {
3127 r = network_get(link->manager, link->sd_device, link->ifname,
3128 &link->mac, &network);
3129 if (r == -ENOENT) {
3130 link_enter_unmanaged(link);
3131 return 1;
3132 } else if (r == 0 && network->unmanaged) {
3133 link_enter_unmanaged(link);
3134 return 0;
3135 } else if (r < 0)
3136 return r;
3137
3138 if (link->flags & IFF_LOOPBACK) {
3139 if (network->link_local != ADDRESS_FAMILY_NO)
3140 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3141
3142 if (network->dhcp != ADDRESS_FAMILY_NO)
3143 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3144
3145 if (network->dhcp_server)
3146 log_link_debug(link, "Ignoring DHCP server for loopback link");
3147 }
3148
3149 r = network_apply(network, link);
3150 if (r < 0)
3151 return r;
3152 }
3153
3154 r = link_new_bound_to_list(link);
3155 if (r < 0)
3156 return r;
3157
3158 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3159 * link_configure() is called later asynchronously. */
3160 r = link_configure_duid(link);
3161 if (r <= 0)
3162 return r;
3163
3164 r = link_configure(link);
3165 if (r < 0)
3166 return r;
3167
3168 return 1;
3169 }
3170
3171 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
3172 (void) link_initialized_and_synced(userdata);
3173 return 1;
3174 }
3175
3176 int link_initialized(Link *link, sd_device *device) {
3177 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3178 int r;
3179
3180 assert(link);
3181 assert(link->manager);
3182 assert(link->manager->rtnl);
3183 assert(device);
3184
3185 if (link->state != LINK_STATE_PENDING)
3186 return 0;
3187
3188 if (link->sd_device)
3189 return 0;
3190
3191 log_link_debug(link, "udev initialized link");
3192
3193 link->sd_device = sd_device_ref(device);
3194
3195 /* udev has initialized the link, but we don't know if we have yet
3196 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3197 * when it returns we know that the pending NEWLINKs have already been
3198 * processed and that we are up-to-date */
3199
3200 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3201 link->ifindex);
3202 if (r < 0)
3203 return r;
3204
3205 r = sd_netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3206 link_netlink_destroy_callback, link, 0, __func__);
3207 if (r < 0)
3208 return r;
3209
3210 link_ref(link);
3211
3212 return 0;
3213 }
3214
3215 static int link_load(Link *link) {
3216 _cleanup_free_ char *network_file = NULL,
3217 *addresses = NULL,
3218 *routes = NULL,
3219 *dhcp4_address = NULL,
3220 *ipv4ll_address = NULL;
3221 union in_addr_union address;
3222 union in_addr_union route_dst;
3223 const char *p;
3224 int r;
3225
3226 assert(link);
3227
3228 r = parse_env_file(NULL, link->state_file,
3229 "NETWORK_FILE", &network_file,
3230 "ADDRESSES", &addresses,
3231 "ROUTES", &routes,
3232 "DHCP4_ADDRESS", &dhcp4_address,
3233 "IPV4LL_ADDRESS", &ipv4ll_address);
3234 if (r < 0 && r != -ENOENT)
3235 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3236
3237 if (network_file) {
3238 Network *network;
3239 char *suffix;
3240
3241 /* drop suffix */
3242 suffix = strrchr(network_file, '.');
3243 if (!suffix) {
3244 log_link_debug(link, "Failed to get network name from %s", network_file);
3245 goto network_file_fail;
3246 }
3247 *suffix = '\0';
3248
3249 r = network_get_by_name(link->manager, basename(network_file), &network);
3250 if (r < 0) {
3251 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3252 goto network_file_fail;
3253 }
3254
3255 r = network_apply(network, link);
3256 if (r < 0)
3257 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3258 }
3259
3260 network_file_fail:
3261
3262 if (addresses) {
3263 p = addresses;
3264
3265 for (;;) {
3266 _cleanup_free_ char *address_str = NULL;
3267 char *prefixlen_str;
3268 int family;
3269 unsigned char prefixlen;
3270
3271 r = extract_first_word(&p, &address_str, NULL, 0);
3272 if (r < 0) {
3273 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3274 continue;
3275 }
3276 if (r == 0)
3277 break;
3278
3279 prefixlen_str = strchr(address_str, '/');
3280 if (!prefixlen_str) {
3281 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3282 continue;
3283 }
3284
3285 *prefixlen_str++ = '\0';
3286
3287 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3288 if (r != 1) {
3289 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3290 continue;
3291 }
3292
3293 r = in_addr_from_string_auto(address_str, &family, &address);
3294 if (r < 0) {
3295 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3296 continue;
3297 }
3298
3299 r = address_add(link, family, &address, prefixlen, NULL);
3300 if (r < 0)
3301 return log_link_error_errno(link, r, "Failed to add address: %m");
3302 }
3303 }
3304
3305 if (routes) {
3306 p = routes;
3307
3308 for (;;) {
3309 Route *route;
3310 _cleanup_free_ char *route_str = NULL;
3311 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3312 usec_t lifetime;
3313 char *prefixlen_str;
3314 int family;
3315 unsigned char prefixlen, tos, table;
3316 uint32_t priority;
3317
3318 r = extract_first_word(&p, &route_str, NULL, 0);
3319 if (r < 0) {
3320 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3321 continue;
3322 }
3323 if (r == 0)
3324 break;
3325
3326 prefixlen_str = strchr(route_str, '/');
3327 if (!prefixlen_str) {
3328 log_link_debug(link, "Failed to parse route %s", route_str);
3329 continue;
3330 }
3331
3332 *prefixlen_str++ = '\0';
3333
3334 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3335 if (r != 5) {
3336 log_link_debug(link,
3337 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3338 prefixlen_str);
3339 continue;
3340 }
3341
3342 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3343 if (r < 0) {
3344 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3345 continue;
3346 }
3347
3348 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3349 if (r < 0)
3350 return log_link_error_errno(link, r, "Failed to add route: %m");
3351
3352 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3353 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3354 0, route_expire_handler, route);
3355 if (r < 0)
3356 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3357 }
3358
3359 route->lifetime = lifetime;
3360 sd_event_source_unref(route->expire);
3361 route->expire = TAKE_PTR(expire);
3362 }
3363 }
3364
3365 if (dhcp4_address) {
3366 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3367 if (r < 0) {
3368 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3369 goto dhcp4_address_fail;
3370 }
3371
3372 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3373 if (r < 0)
3374 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3375
3376 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3377 if (r < 0)
3378 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3379 }
3380
3381 dhcp4_address_fail:
3382
3383 if (ipv4ll_address) {
3384 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3385 if (r < 0) {
3386 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3387 goto ipv4ll_address_fail;
3388 }
3389
3390 r = sd_ipv4ll_new(&link->ipv4ll);
3391 if (r < 0)
3392 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3393
3394 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3395 if (r < 0)
3396 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3397 }
3398
3399 ipv4ll_address_fail:
3400
3401 return 0;
3402 }
3403
3404 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3405 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3406 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3407 Link *link;
3408 int r;
3409
3410 assert(m);
3411 assert(m->rtnl);
3412 assert(message);
3413 assert(ret);
3414
3415 r = link_new(m, message, ret);
3416 if (r < 0)
3417 return r;
3418
3419 link = *ret;
3420
3421 log_link_debug(link, "Link %d added", link->ifindex);
3422
3423 r = link_load(link);
3424 if (r < 0)
3425 return r;
3426
3427 if (detect_container() <= 0) {
3428 /* not in a container, udev will be around */
3429 sprintf(ifindex_str, "n%d", link->ifindex);
3430 r = sd_device_new_from_device_id(&device, ifindex_str);
3431 if (r < 0) {
3432 log_link_warning_errno(link, r, "Could not find device: %m");
3433 goto failed;
3434 }
3435
3436 r = sd_device_get_is_initialized(device);
3437 if (r < 0) {
3438 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3439 goto failed;
3440 }
3441 if (r == 0) {
3442 /* not yet ready */
3443 log_link_debug(link, "link pending udev initialization...");
3444 return 0;
3445 }
3446
3447 r = link_initialized(link, device);
3448 if (r < 0)
3449 goto failed;
3450 } else {
3451 r = link_initialized_and_synced(link);
3452 if (r < 0)
3453 goto failed;
3454 }
3455
3456 return 0;
3457 failed:
3458 link_enter_failed(link);
3459 return r;
3460 }
3461
3462 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3463 int r;
3464
3465 assert(link);
3466
3467 log_link_info(link, "Gained IPv6LL");
3468
3469 link->ipv6ll_address = *address;
3470 link_check_ready(link);
3471
3472 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3473 r = link_acquire_ipv6_conf(link);
3474 if (r < 0) {
3475 link_enter_failed(link);
3476 return r;
3477 }
3478 }
3479
3480 return 0;
3481 }
3482
3483 static int link_carrier_gained(Link *link) {
3484 int r;
3485
3486 assert(link);
3487
3488 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED, LINK_STATE_FAILED)) {
3489 r = link_acquire_conf(link);
3490 if (r < 0) {
3491 link_enter_failed(link);
3492 return r;
3493 }
3494
3495 r = link_enter_set_addresses(link);
3496 if (r < 0)
3497 return r;
3498 }
3499
3500 r = link_handle_bound_by_list(link);
3501 if (r < 0)
3502 return r;
3503
3504 return 0;
3505 }
3506
3507 static int link_carrier_lost(Link *link) {
3508 int r;
3509
3510 assert(link);
3511
3512 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3513 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3514 * configuration and stop the clients as well. */
3515 if (link->setting_mtu)
3516 return 0;
3517
3518 r = link_stop_clients(link);
3519 if (r < 0) {
3520 link_enter_failed(link);
3521 return r;
3522 }
3523
3524 if (link_dhcp4_server_enabled(link))
3525 (void) sd_dhcp_server_stop(link->dhcp_server);
3526
3527 r = link_drop_config(link);
3528 if (r < 0)
3529 return r;
3530
3531 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3532 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3533 r = link_drop_foreign_config(link);
3534 if (r < 0)
3535 return r;
3536 }
3537
3538 r = link_handle_bound_by_list(link);
3539 if (r < 0)
3540 return r;
3541
3542 return 0;
3543 }
3544
3545 int link_carrier_reset(Link *link) {
3546 int r;
3547
3548 assert(link);
3549
3550 if (link_has_carrier(link)) {
3551 r = link_carrier_lost(link);
3552 if (r < 0)
3553 return r;
3554
3555 r = link_carrier_gained(link);
3556 if (r < 0)
3557 return r;
3558
3559 log_link_info(link, "Reset carrier");
3560 }
3561
3562 return 0;
3563 }
3564
3565 int link_update(Link *link, sd_netlink_message *m) {
3566 struct ether_addr mac;
3567 const char *ifname;
3568 uint32_t mtu;
3569 bool had_carrier, carrier_gained, carrier_lost;
3570 int r;
3571
3572 assert(link);
3573 assert(link->ifname);
3574 assert(m);
3575
3576 if (link->state == LINK_STATE_LINGER) {
3577 log_link_info(link, "Link readded");
3578 link_set_state(link, LINK_STATE_ENSLAVING);
3579
3580 r = link_new_carrier_maps(link);
3581 if (r < 0)
3582 return r;
3583 }
3584
3585 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3586 if (r >= 0 && !streq(ifname, link->ifname)) {
3587 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3588
3589 if (link->state == LINK_STATE_PENDING) {
3590 r = free_and_strdup(&link->ifname, ifname);
3591 if (r < 0)
3592 return r;
3593 } else {
3594 Manager *manager = link->manager;
3595
3596 link_drop(link);
3597 r = link_add(manager, m, &link);
3598 if (r < 0)
3599 return r;
3600 }
3601 }
3602
3603 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3604 if (r >= 0 && mtu > 0) {
3605 link->mtu = mtu;
3606 if (link->original_mtu == 0) {
3607 link->original_mtu = mtu;
3608 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3609 }
3610
3611 if (link->dhcp_client) {
3612 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3613 link->mtu);
3614 if (r < 0)
3615 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3616 }
3617
3618 if (link->radv) {
3619 r = sd_radv_set_mtu(link->radv, link->mtu);
3620 if (r < 0)
3621 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3622 }
3623 }
3624
3625 /* The kernel may broadcast NEWLINK messages without the MAC address
3626 set, simply ignore them. */
3627 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3628 if (r >= 0) {
3629 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3630 ETH_ALEN)) {
3631
3632 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3633 ETH_ALEN);
3634
3635 log_link_debug(link, "MAC address: "
3636 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3637 mac.ether_addr_octet[0],
3638 mac.ether_addr_octet[1],
3639 mac.ether_addr_octet[2],
3640 mac.ether_addr_octet[3],
3641 mac.ether_addr_octet[4],
3642 mac.ether_addr_octet[5]);
3643
3644 if (link->ipv4ll) {
3645 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3646 if (r < 0)
3647 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3648 }
3649
3650 if (link->dhcp_client) {
3651 r = sd_dhcp_client_set_mac(link->dhcp_client,
3652 (const uint8_t *) &link->mac,
3653 sizeof (link->mac),
3654 ARPHRD_ETHER);
3655 if (r < 0)
3656 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3657
3658 r = dhcp4_set_client_identifier(link);
3659 if (r < 0)
3660 return r;
3661 }
3662
3663 if (link->dhcp6_client) {
3664 const DUID* duid = link_get_duid(link);
3665
3666 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3667 (const uint8_t *) &link->mac,
3668 sizeof (link->mac),
3669 ARPHRD_ETHER);
3670 if (r < 0)
3671 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3672
3673 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3674 link->network->iaid);
3675 if (r < 0)
3676 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3677
3678 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3679 duid->type,
3680 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3681 duid->raw_data_len);
3682 if (r < 0)
3683 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3684 }
3685
3686 if (link->radv) {
3687 r = sd_radv_set_mac(link->radv, &link->mac);
3688 if (r < 0)
3689 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3690 }
3691
3692 if (link->ndisc) {
3693 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3694 if (r < 0)
3695 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3696 }
3697 }
3698 }
3699
3700 had_carrier = link_has_carrier(link);
3701
3702 r = link_update_flags(link, m);
3703 if (r < 0)
3704 return r;
3705
3706 r = link_update_lldp(link);
3707 if (r < 0)
3708 return r;
3709
3710 carrier_gained = !had_carrier && link_has_carrier(link);
3711 carrier_lost = had_carrier && !link_has_carrier(link);
3712
3713 if (carrier_gained) {
3714 log_link_info(link, "Gained carrier");
3715
3716 r = link_carrier_gained(link);
3717 if (r < 0)
3718 return r;
3719 } else if (carrier_lost) {
3720 log_link_info(link, "Lost carrier");
3721
3722 r = link_carrier_lost(link);
3723 if (r < 0)
3724 return r;
3725 }
3726
3727 return 0;
3728 }
3729
3730 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3731 bool space = false;
3732 Iterator i;
3733 Link *link;
3734
3735 assert(f);
3736 assert(prefix);
3737
3738 if (hashmap_isempty(h))
3739 return;
3740
3741 fputs(prefix, f);
3742 HASHMAP_FOREACH(link, h, i) {
3743 if (space)
3744 fputc(' ', f);
3745
3746 fprintf(f, "%i", link->ifindex);
3747 space = true;
3748 }
3749
3750 fputc('\n', f);
3751 }
3752
3753 int link_save(Link *link) {
3754 _cleanup_free_ char *temp_path = NULL;
3755 _cleanup_fclose_ FILE *f = NULL;
3756 const char *admin_state, *oper_state;
3757 Address *a;
3758 Route *route;
3759 Iterator i;
3760 int r;
3761
3762 assert(link);
3763 assert(link->state_file);
3764 assert(link->lease_file);
3765 assert(link->manager);
3766
3767 if (link->state == LINK_STATE_LINGER) {
3768 unlink(link->state_file);
3769 return 0;
3770 }
3771
3772 link_lldp_save(link);
3773
3774 admin_state = link_state_to_string(link->state);
3775 assert(admin_state);
3776
3777 oper_state = link_operstate_to_string(link->operstate);
3778 assert(oper_state);
3779
3780 r = fopen_temporary(link->state_file, &f, &temp_path);
3781 if (r < 0)
3782 goto fail;
3783
3784 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
3785 (void) fchmod(fileno(f), 0644);
3786
3787 fprintf(f,
3788 "# This is private data. Do not parse.\n"
3789 "ADMIN_STATE=%s\n"
3790 "OPER_STATE=%s\n",
3791 admin_state, oper_state);
3792
3793 if (link->network) {
3794 bool space;
3795 sd_dhcp6_lease *dhcp6_lease = NULL;
3796 const char *dhcp_domainname = NULL;
3797 char **dhcp6_domains = NULL;
3798 char **dhcp_domains = NULL;
3799 unsigned j;
3800
3801 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3802 yes_no(link->network->required_for_online));
3803
3804 if (link->dhcp6_client) {
3805 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3806 if (r < 0 && r != -ENOMSG)
3807 log_link_debug(link, "No DHCPv6 lease");
3808 }
3809
3810 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3811
3812 fputs("DNS=", f);
3813 space = false;
3814
3815 for (j = 0; j < link->network->n_dns; j++) {
3816 _cleanup_free_ char *b = NULL;
3817
3818 r = in_addr_to_string(link->network->dns[j].family,
3819 &link->network->dns[j].address, &b);
3820 if (r < 0) {
3821 log_debug_errno(r, "Failed to format address, ignoring: %m");
3822 continue;
3823 }
3824
3825 if (space)
3826 fputc(' ', f);
3827 fputs(b, f);
3828 space = true;
3829 }
3830
3831 if (link->network->dhcp_use_dns &&
3832 link->dhcp_lease) {
3833 const struct in_addr *addresses;
3834
3835 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3836 if (r > 0) {
3837 if (space)
3838 fputc(' ', f);
3839 serialize_in_addrs(f, addresses, r);
3840 space = true;
3841 }
3842 }
3843
3844 if (link->network->dhcp_use_dns && dhcp6_lease) {
3845 struct in6_addr *in6_addrs;
3846
3847 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3848 if (r > 0) {
3849 if (space)
3850 fputc(' ', f);
3851 serialize_in6_addrs(f, in6_addrs, r);
3852 space = true;
3853 }
3854 }
3855
3856 /* Make sure to flush out old entries before we use the NDISC data */
3857 ndisc_vacuum(link);
3858
3859 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3860 NDiscRDNSS *dd;
3861
3862 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3863 if (space)
3864 fputc(' ', f);
3865
3866 serialize_in6_addrs(f, &dd->address, 1);
3867 space = true;
3868 }
3869 }
3870
3871 fputc('\n', f);
3872
3873 fputs("NTP=", f);
3874 space = false;
3875 fputstrv(f, link->network->ntp, NULL, &space);
3876
3877 if (link->network->dhcp_use_ntp &&
3878 link->dhcp_lease) {
3879 const struct in_addr *addresses;
3880
3881 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3882 if (r > 0) {
3883 if (space)
3884 fputc(' ', f);
3885 serialize_in_addrs(f, addresses, r);
3886 space = true;
3887 }
3888 }
3889
3890 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3891 struct in6_addr *in6_addrs;
3892 char **hosts;
3893
3894 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3895 &in6_addrs);
3896 if (r > 0) {
3897 if (space)
3898 fputc(' ', f);
3899 serialize_in6_addrs(f, in6_addrs, r);
3900 space = true;
3901 }
3902
3903 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3904 if (r > 0)
3905 fputstrv(f, hosts, NULL, &space);
3906 }
3907
3908 fputc('\n', f);
3909
3910 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3911 if (link->dhcp_lease) {
3912 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3913 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3914 }
3915 if (dhcp6_lease)
3916 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3917 }
3918
3919 fputs("DOMAINS=", f);
3920 space = false;
3921 fputstrv(f, link->network->search_domains, NULL, &space);
3922
3923 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3924 NDiscDNSSL *dd;
3925
3926 if (dhcp_domainname)
3927 fputs_with_space(f, dhcp_domainname, NULL, &space);
3928 if (dhcp_domains)
3929 fputstrv(f, dhcp_domains, NULL, &space);
3930 if (dhcp6_domains)
3931 fputstrv(f, dhcp6_domains, NULL, &space);
3932
3933 SET_FOREACH(dd, link->ndisc_dnssl, i)
3934 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3935 }
3936
3937 fputc('\n', f);
3938
3939 fputs("ROUTE_DOMAINS=", f);
3940 space = false;
3941 fputstrv(f, link->network->route_domains, NULL, &space);
3942
3943 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3944 NDiscDNSSL *dd;
3945
3946 if (dhcp_domainname)
3947 fputs_with_space(f, dhcp_domainname, NULL, &space);
3948 if (dhcp_domains)
3949 fputstrv(f, dhcp_domains, NULL, &space);
3950 if (dhcp6_domains)
3951 fputstrv(f, dhcp6_domains, NULL, &space);
3952
3953 SET_FOREACH(dd, link->ndisc_dnssl, i)
3954 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3955 }
3956
3957 fputc('\n', f);
3958
3959 fprintf(f, "LLMNR=%s\n",
3960 resolve_support_to_string(link->network->llmnr));
3961 fprintf(f, "MDNS=%s\n",
3962 resolve_support_to_string(link->network->mdns));
3963
3964 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3965 fprintf(f, "DNS_OVER_TLS=%s\n",
3966 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
3967
3968 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3969 fprintf(f, "DNSSEC=%s\n",
3970 dnssec_mode_to_string(link->network->dnssec_mode));
3971
3972 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3973 const char *n;
3974
3975 fputs("DNSSEC_NTA=", f);
3976 space = false;
3977 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3978 fputs_with_space(f, n, NULL, &space);
3979 fputc('\n', f);
3980 }
3981
3982 fputs("ADDRESSES=", f);
3983 space = false;
3984 SET_FOREACH(a, link->addresses, i) {
3985 _cleanup_free_ char *address_str = NULL;
3986
3987 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3988 if (r < 0)
3989 goto fail;
3990
3991 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3992 space = true;
3993 }
3994 fputc('\n', f);
3995
3996 fputs("ROUTES=", f);
3997 space = false;
3998 SET_FOREACH(route, link->routes, i) {
3999 _cleanup_free_ char *route_str = NULL;
4000
4001 r = in_addr_to_string(route->family, &route->dst, &route_str);
4002 if (r < 0)
4003 goto fail;
4004
4005 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4006 space ? " " : "", route_str,
4007 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4008 space = true;
4009 }
4010
4011 fputc('\n', f);
4012 }
4013
4014 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4015 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4016
4017 if (link->dhcp_lease) {
4018 struct in_addr address;
4019 const char *tz = NULL;
4020
4021 assert(link->network);
4022
4023 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
4024 if (r >= 0)
4025 fprintf(f, "TIMEZONE=%s\n", tz);
4026
4027 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
4028 if (r >= 0) {
4029 fputs("DHCP4_ADDRESS=", f);
4030 serialize_in_addrs(f, &address, 1);
4031 fputc('\n', f);
4032 }
4033
4034 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4035 if (r < 0)
4036 goto fail;
4037
4038 fprintf(f,
4039 "DHCP_LEASE=%s\n",
4040 link->lease_file);
4041 } else
4042 unlink(link->lease_file);
4043
4044 if (link->ipv4ll) {
4045 struct in_addr address;
4046
4047 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4048 if (r >= 0) {
4049 fputs("IPV4LL_ADDRESS=", f);
4050 serialize_in_addrs(f, &address, 1);
4051 fputc('\n', f);
4052 }
4053 }
4054
4055 r = fflush_and_check(f);
4056 if (r < 0)
4057 goto fail;
4058
4059 if (rename(temp_path, link->state_file) < 0) {
4060 r = -errno;
4061 goto fail;
4062 }
4063
4064 return 0;
4065
4066 fail:
4067 (void) unlink(link->state_file);
4068 if (temp_path)
4069 (void) unlink(temp_path);
4070
4071 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4072 }
4073
4074 /* The serialized state in /run is no longer up-to-date. */
4075 void link_dirty(Link *link) {
4076 int r;
4077
4078 assert(link);
4079
4080 /* mark manager dirty as link is dirty */
4081 manager_dirty(link->manager);
4082
4083 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
4084 if (r < 0)
4085 /* allocation errors are ignored */
4086 return;
4087
4088 r = set_put(link->manager->dirty_links, link);
4089 if (r <= 0)
4090 /* don't take another ref if the link was already dirty */
4091 return;
4092
4093 link_ref(link);
4094 }
4095
4096 /* The serialized state in /run is up-to-date */
4097 void link_clean(Link *link) {
4098 assert(link);
4099 assert(link->manager);
4100
4101 link_unref(set_remove(link->manager->dirty_links, link));
4102 }
4103
4104 static const char* const link_state_table[_LINK_STATE_MAX] = {
4105 [LINK_STATE_PENDING] = "pending",
4106 [LINK_STATE_ENSLAVING] = "configuring",
4107 [LINK_STATE_SETTING_ADDRESSES] = "configuring",
4108 [LINK_STATE_SETTING_ROUTES] = "configuring",
4109 [LINK_STATE_CONFIGURED] = "configured",
4110 [LINK_STATE_UNMANAGED] = "unmanaged",
4111 [LINK_STATE_FAILED] = "failed",
4112 [LINK_STATE_LINGER] = "linger",
4113 };
4114
4115 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
4116
4117 static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
4118 [LINK_OPERSTATE_OFF] = "off",
4119 [LINK_OPERSTATE_NO_CARRIER] = "no-carrier",
4120 [LINK_OPERSTATE_DORMANT] = "dormant",
4121 [LINK_OPERSTATE_CARRIER] = "carrier",
4122 [LINK_OPERSTATE_DEGRADED] = "degraded",
4123 [LINK_OPERSTATE_ROUTABLE] = "routable",
4124 };
4125
4126 DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
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