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networkd: add support to keep configuration
[thirdparty/systemd.git] / src / network / networkd-link.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <netinet/in.h>
4 #include <linux/if.h>
5 #include <unistd.h>
6
7 #include "alloc-util.h"
8 #include "bus-util.h"
9 #include "dhcp-identifier.h"
10 #include "dhcp-lease-internal.h"
11 #include "env-file.h"
12 #include "fd-util.h"
13 #include "fileio.h"
14 #include "missing_network.h"
15 #include "netdev/bond.h"
16 #include "netdev/bridge.h"
17 #include "netdev/ipvlan.h"
18 #include "netdev/vrf.h"
19 #include "netlink-util.h"
20 #include "network-internal.h"
21 #include "networkd-can.h"
22 #include "networkd-ipv6-proxy-ndp.h"
23 #include "networkd-lldp-tx.h"
24 #include "networkd-manager.h"
25 #include "networkd-ndisc.h"
26 #include "networkd-neighbor.h"
27 #include "networkd-radv.h"
28 #include "networkd-routing-policy-rule.h"
29 #include "set.h"
30 #include "socket-util.h"
31 #include "stdio-util.h"
32 #include "string-table.h"
33 #include "strv.h"
34 #include "sysctl-util.h"
35 #include "tmpfile-util.h"
36 #include "udev-util.h"
37 #include "util.h"
38 #include "virt.h"
39
40 uint32_t link_get_vrf_table(Link *link) {
41 return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
42 }
43
44 uint32_t link_get_dhcp_route_table(Link *link) {
45 /* When the interface is part of an VRF use the VRFs routing table, unless
46 * another table is explicitly specified. */
47 if (link->network->dhcp_route_table_set)
48 return link->network->dhcp_route_table;
49 return link_get_vrf_table(link);
50 }
51
52 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
53 if (link->network->ipv6_accept_ra_route_table_set)
54 return link->network->ipv6_accept_ra_route_table;
55 return link_get_vrf_table(link);
56 }
57
58 DUID* link_get_duid(Link *link) {
59 if (link->network->duid.type != _DUID_TYPE_INVALID)
60 return &link->network->duid;
61 else
62 return &link->manager->duid;
63 }
64
65 static bool link_dhcp6_enabled(Link *link) {
66 assert(link);
67
68 if (!socket_ipv6_is_supported())
69 return false;
70
71 if (link->flags & IFF_LOOPBACK)
72 return false;
73
74 if (!link->network)
75 return false;
76
77 if (link->network->bond)
78 return false;
79
80 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
81 return false;
82
83 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
84 return false;
85
86 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
87 }
88
89 static bool link_dhcp4_enabled(Link *link) {
90 assert(link);
91
92 if (link->flags & IFF_LOOPBACK)
93 return false;
94
95 if (!link->network)
96 return false;
97
98 if (link->network->bond)
99 return false;
100
101 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
102 return false;
103
104 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
105 }
106
107 static bool link_dhcp4_server_enabled(Link *link) {
108 assert(link);
109
110 if (link->flags & IFF_LOOPBACK)
111 return false;
112
113 if (!link->network)
114 return false;
115
116 if (link->network->bond)
117 return false;
118
119 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
120 return false;
121
122 return link->network->dhcp_server;
123 }
124
125 bool link_ipv4ll_enabled(Link *link, AddressFamilyBoolean mask) {
126 assert(link);
127 assert((mask & ~(ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) == 0);
128
129 if (link->flags & IFF_LOOPBACK)
130 return false;
131
132 if (!link->network)
133 return false;
134
135 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "ip6gre", "ip6tnl", "sit", "vti", "vti6", "can", "vcan", "vxcan", "nlmon"))
136 return false;
137
138 /* L3 or L3S mode do not support ARP. */
139 if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S))
140 return false;
141
142 if (link->network->bond)
143 return false;
144
145 if (link->network->bond)
146 return false;
147
148 return link->network->link_local & mask;
149 }
150
151 static bool link_ipv6ll_enabled(Link *link) {
152 assert(link);
153
154 if (!socket_ipv6_is_supported())
155 return false;
156
157 if (link->flags & IFF_LOOPBACK)
158 return false;
159
160 if (!link->network)
161 return false;
162
163 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "sit", "vti", "can", "vcan", "vxcan", "nlmon"))
164 return false;
165
166 if (link->network->bond)
167 return false;
168
169 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
170 return false;
171
172 return link->network->link_local & ADDRESS_FAMILY_IPV6;
173 }
174
175 static bool link_ipv6_enabled(Link *link) {
176 assert(link);
177
178 if (!socket_ipv6_is_supported())
179 return false;
180
181 if (link->network->bond)
182 return false;
183
184 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
185 return false;
186
187 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
188 return false;
189
190 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
191 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
192 }
193
194 static bool link_radv_enabled(Link *link) {
195 assert(link);
196
197 if (!link_ipv6ll_enabled(link))
198 return false;
199
200 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
201 }
202
203 static bool link_ipv4_forward_enabled(Link *link) {
204 assert(link);
205
206 if (link->flags & IFF_LOOPBACK)
207 return false;
208
209 if (!link->network)
210 return false;
211
212 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
213 return false;
214
215 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
216 }
217
218 static bool link_ipv6_forward_enabled(Link *link) {
219 assert(link);
220
221 if (!socket_ipv6_is_supported())
222 return false;
223
224 if (link->flags & IFF_LOOPBACK)
225 return false;
226
227 if (!link->network)
228 return false;
229
230 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
231 return false;
232
233 if (manager_sysctl_ipv6_enabled(link->manager) == 0)
234 return false;
235
236 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
237 }
238
239 static bool link_proxy_arp_enabled(Link *link) {
240 assert(link);
241
242 if (link->flags & IFF_LOOPBACK)
243 return false;
244
245 if (!link->network)
246 return false;
247
248 if (link->network->proxy_arp < 0)
249 return false;
250
251 return true;
252 }
253
254 static bool link_ipv6_accept_ra_enabled(Link *link) {
255 assert(link);
256
257 if (!socket_ipv6_is_supported())
258 return false;
259
260 if (link->flags & IFF_LOOPBACK)
261 return false;
262
263 if (!link->network)
264 return false;
265
266 if (!link_ipv6ll_enabled(link))
267 return false;
268
269 /* If unset use system default (enabled if local forwarding is disabled.
270 * disabled if local forwarding is enabled).
271 * If set, ignore or enforce RA independent of local forwarding state.
272 */
273 if (link->network->ipv6_accept_ra < 0)
274 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
275 return !link_ipv6_forward_enabled(link);
276 else if (link->network->ipv6_accept_ra > 0)
277 /* accept RA even if ip_forward is enabled */
278 return true;
279 else
280 /* ignore RA */
281 return false;
282 }
283
284 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
285 assert(link);
286
287 if (!socket_ipv6_is_supported())
288 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
289
290 if (link->flags & IFF_LOOPBACK)
291 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
292
293 if (!link->network)
294 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
295
296 return link->network->ipv6_privacy_extensions;
297 }
298
299 static int link_enable_ipv6(Link *link) {
300 bool disabled;
301 int r;
302
303 if (link->flags & IFF_LOOPBACK)
304 return 0;
305
306 disabled = !link_ipv6_enabled(link);
307
308 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", disabled);
309 if (r < 0)
310 log_link_warning_errno(link, r, "Cannot %s IPv6: %m", enable_disable(!disabled));
311 else
312 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
313
314 return 0;
315 }
316
317 static bool link_is_enslaved(Link *link) {
318 if (link->flags & IFF_SLAVE)
319 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
320 return true;
321
322 if (!link->network)
323 return false;
324
325 if (link->master_ifindex > 0 && link->network->bridge)
326 return true;
327
328 /* TODO: add conditions for other netdevs. */
329
330 return false;
331 }
332
333 static void link_update_master_operstate(Link *link, NetDev *netdev) {
334 Link *master;
335
336 if (!netdev)
337 return;
338
339 if (link_get(link->manager, netdev->ifindex, &master) < 0)
340 return;
341
342 link_update_operstate(master, true);
343 }
344
345 void link_update_operstate(Link *link, bool also_update_master) {
346 LinkOperationalState operstate;
347 Iterator i;
348
349 assert(link);
350
351 if (link->kernel_operstate == IF_OPER_DORMANT)
352 operstate = LINK_OPERSTATE_DORMANT;
353 else if (link_has_carrier(link)) {
354 Address *address;
355 uint8_t scope = RT_SCOPE_NOWHERE;
356
357 /* if we have carrier, check what addresses we have */
358 SET_FOREACH(address, link->addresses, i) {
359 if (!address_is_ready(address))
360 continue;
361
362 if (address->scope < scope)
363 scope = address->scope;
364 }
365
366 /* for operstate we also take foreign addresses into account */
367 SET_FOREACH(address, link->addresses_foreign, i) {
368 if (!address_is_ready(address))
369 continue;
370
371 if (address->scope < scope)
372 scope = address->scope;
373 }
374
375 if (scope < RT_SCOPE_SITE)
376 /* universally accessible addresses found */
377 operstate = LINK_OPERSTATE_ROUTABLE;
378 else if (scope < RT_SCOPE_HOST)
379 /* only link or site local addresses found */
380 operstate = LINK_OPERSTATE_DEGRADED;
381 else
382 /* no useful addresses found */
383 operstate = LINK_OPERSTATE_CARRIER;
384 } else if (link->flags & IFF_UP)
385 operstate = LINK_OPERSTATE_NO_CARRIER;
386 else
387 operstate = LINK_OPERSTATE_OFF;
388
389 if (IN_SET(operstate, LINK_OPERSTATE_DEGRADED, LINK_OPERSTATE_CARRIER) &&
390 link_is_enslaved(link))
391 operstate = LINK_OPERSTATE_ENSLAVED;
392
393 if (operstate >= LINK_OPERSTATE_CARRIER) {
394 Link *slave;
395
396 SET_FOREACH(slave, link->slaves, i) {
397 link_update_operstate(slave, false);
398
399 if (slave->operstate < LINK_OPERSTATE_CARRIER)
400 operstate = LINK_OPERSTATE_DEGRADED_CARRIER;
401 }
402 }
403
404 if (link->operstate != operstate) {
405 link->operstate = operstate;
406 link_send_changed(link, "OperationalState", NULL);
407 link_dirty(link);
408 }
409
410 if (also_update_master && link->network) {
411 link_update_master_operstate(link, link->network->bond);
412 link_update_master_operstate(link, link->network->bridge);
413 }
414 }
415
416 #define FLAG_STRING(string, flag, old, new) \
417 (((old ^ new) & flag) \
418 ? ((old & flag) ? (" -" string) : (" +" string)) \
419 : "")
420
421 static int link_update_flags(Link *link, sd_netlink_message *m, bool force_update_operstate) {
422 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
423 uint8_t operstate;
424 int r;
425
426 assert(link);
427
428 r = sd_rtnl_message_link_get_flags(m, &flags);
429 if (r < 0)
430 return log_link_warning_errno(link, r, "Could not get link flags: %m");
431
432 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
433 if (r < 0)
434 /* if we got a message without operstate, take it to mean
435 the state was unchanged */
436 operstate = link->kernel_operstate;
437
438 if (!force_update_operstate && (link->flags == flags) && (link->kernel_operstate == operstate))
439 return 0;
440
441 if (link->flags != flags) {
442 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",
443 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
444 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
445 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
446 FLAG_STRING("UP", IFF_UP, link->flags, flags),
447 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
448 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
449 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
450 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
451 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
452 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
453 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
454 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
455 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
456 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
457 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
458 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
459 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
460 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
461 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
462
463 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
464 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
465 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
466 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
467 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
468 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
469 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
470 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
471
472 /* link flags are currently at most 18 bits, let's align to
473 * printing 20 */
474 if (unknown_flags_added)
475 log_link_debug(link,
476 "Unknown link flags gained: %#.5x (ignoring)",
477 unknown_flags_added);
478
479 if (unknown_flags_removed)
480 log_link_debug(link,
481 "Unknown link flags lost: %#.5x (ignoring)",
482 unknown_flags_removed);
483 }
484
485 link->flags = flags;
486 link->kernel_operstate = operstate;
487
488 link_update_operstate(link, true);
489
490 return 0;
491 }
492
493 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
494 _cleanup_(link_unrefp) Link *link = NULL;
495 uint16_t type;
496 const char *ifname, *kind = NULL;
497 int r, ifindex;
498 unsigned short iftype;
499
500 assert(manager);
501 assert(message);
502 assert(ret);
503
504 /* check for link kind */
505 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
506 if (r == 0) {
507 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
508 r = sd_netlink_message_exit_container(message);
509 if (r < 0)
510 return r;
511 }
512
513 r = sd_netlink_message_get_type(message, &type);
514 if (r < 0)
515 return r;
516 else if (type != RTM_NEWLINK)
517 return -EINVAL;
518
519 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
520 if (r < 0)
521 return r;
522 else if (ifindex <= 0)
523 return -EINVAL;
524
525 r = sd_rtnl_message_link_get_type(message, &iftype);
526 if (r < 0)
527 return r;
528
529 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
530 if (r < 0)
531 return r;
532
533 link = new(Link, 1);
534 if (!link)
535 return -ENOMEM;
536
537 *link = (Link) {
538 .n_ref = 1,
539 .manager = manager,
540 .state = LINK_STATE_PENDING,
541 .rtnl_extended_attrs = true,
542 .ifindex = ifindex,
543 .iftype = iftype,
544 };
545
546 link->ifname = strdup(ifname);
547 if (!link->ifname)
548 return -ENOMEM;
549
550 if (kind) {
551 link->kind = strdup(kind);
552 if (!link->kind)
553 return -ENOMEM;
554 }
555
556 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
557 if (r < 0)
558 log_link_debug_errno(link, r, "New device has no master, continuing without");
559
560 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
561 if (r < 0)
562 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
563
564 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
565 return -ENOMEM;
566
567 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
568 return -ENOMEM;
569
570 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
571 return -ENOMEM;
572
573 r = hashmap_ensure_allocated(&manager->links, NULL);
574 if (r < 0)
575 return r;
576
577 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
578 if (r < 0)
579 return r;
580
581 r = link_update_flags(link, message, false);
582 if (r < 0)
583 return r;
584
585 *ret = TAKE_PTR(link);
586
587 return 0;
588 }
589
590 static Link *link_free(Link *link) {
591 Address *address;
592
593 assert(link);
594
595 link->routes = set_free_with_destructor(link->routes, route_free);
596 link->routes_foreign = set_free_with_destructor(link->routes_foreign, route_free);
597
598 link->addresses = set_free_with_destructor(link->addresses, address_free);
599 link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free);
600
601 while ((address = link->pool_addresses)) {
602 LIST_REMOVE(addresses, link->pool_addresses, address);
603 address_free(address);
604 }
605
606 sd_dhcp_server_unref(link->dhcp_server);
607 sd_dhcp_client_unref(link->dhcp_client);
608 sd_dhcp_lease_unref(link->dhcp_lease);
609
610 link_lldp_emit_stop(link);
611
612 free(link->lease_file);
613
614 sd_lldp_unref(link->lldp);
615 free(link->lldp_file);
616
617 ndisc_flush(link);
618
619 sd_ipv4ll_unref(link->ipv4ll);
620 sd_dhcp6_client_unref(link->dhcp6_client);
621 sd_ndisc_unref(link->ndisc);
622 sd_radv_unref(link->radv);
623
624 free(link->ifname);
625 free(link->kind);
626
627 (void) unlink(link->state_file);
628 free(link->state_file);
629
630 sd_device_unref(link->sd_device);
631
632 hashmap_free(link->bound_to_links);
633 hashmap_free(link->bound_by_links);
634
635 set_free_with_destructor(link->slaves, link_unref);
636
637 network_unref(link->network);
638
639 return mfree(link);
640 }
641
642 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
643
644 int link_get(Manager *m, int ifindex, Link **ret) {
645 Link *link;
646
647 assert(m);
648 assert(ifindex);
649 assert(ret);
650
651 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
652 if (!link)
653 return -ENODEV;
654
655 *ret = link;
656
657 return 0;
658 }
659
660 void link_set_state(Link *link, LinkState state) {
661 assert(link);
662
663 if (link->state == state)
664 return;
665
666 log_link_debug(link, "State changed: %s -> %s",
667 link_state_to_string(link->state),
668 link_state_to_string(state));
669
670 link->state = state;
671
672 link_send_changed(link, "AdministrativeState", NULL);
673 }
674
675 static void link_enter_unmanaged(Link *link) {
676 assert(link);
677
678 link_set_state(link, LINK_STATE_UNMANAGED);
679
680 link_dirty(link);
681 }
682
683 int link_stop_clients(Link *link) {
684 int r = 0, k;
685
686 assert(link);
687 assert(link->manager);
688 assert(link->manager->event);
689
690 if (link->dhcp_client) {
691 k = sd_dhcp_client_stop(link->dhcp_client);
692 if (k < 0)
693 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
694 }
695
696 if (link->ipv4ll) {
697 k = sd_ipv4ll_stop(link->ipv4ll);
698 if (k < 0)
699 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
700 }
701
702 if (link->dhcp6_client) {
703 k = sd_dhcp6_client_stop(link->dhcp6_client);
704 if (k < 0)
705 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
706 }
707
708 if (link->ndisc) {
709 k = sd_ndisc_stop(link->ndisc);
710 if (k < 0)
711 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
712 }
713
714 if (link->radv) {
715 k = sd_radv_stop(link->radv);
716 if (k < 0)
717 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
718 }
719
720 link_lldp_emit_stop(link);
721 return r;
722 }
723
724 void link_enter_failed(Link *link) {
725 assert(link);
726
727 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
728 return;
729
730 log_link_warning(link, "Failed");
731
732 link_set_state(link, LINK_STATE_FAILED);
733
734 link_stop_clients(link);
735
736 link_dirty(link);
737 }
738
739 static Address* link_find_dhcp_server_address(Link *link) {
740 Address *address;
741
742 assert(link);
743 assert(link->network);
744
745 /* The first statically configured address if there is any */
746 LIST_FOREACH(addresses, address, link->network->static_addresses) {
747
748 if (address->family != AF_INET)
749 continue;
750
751 if (in_addr_is_null(address->family, &address->in_addr))
752 continue;
753
754 return address;
755 }
756
757 /* If that didn't work, find a suitable address we got from the pool */
758 LIST_FOREACH(addresses, address, link->pool_addresses) {
759 if (address->family != AF_INET)
760 continue;
761
762 return address;
763 }
764
765 return NULL;
766 }
767
768 static int link_join_netdevs_after_configured(Link *link) {
769 NetDev *netdev;
770 Iterator i;
771 int r;
772
773 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
774 if (netdev->ifindex > 0)
775 /* Assume already enslaved. */
776 continue;
777
778 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
779 continue;
780
781 log_struct(LOG_DEBUG,
782 LOG_LINK_INTERFACE(link),
783 LOG_NETDEV_INTERFACE(netdev),
784 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
785
786 r = netdev_join(netdev, link, NULL);
787 if (r < 0)
788 return log_struct_errno(LOG_WARNING, r,
789 LOG_LINK_INTERFACE(link),
790 LOG_NETDEV_INTERFACE(netdev),
791 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
792 }
793
794 return 0;
795 }
796
797 static void link_enter_configured(Link *link) {
798 assert(link);
799 assert(link->network);
800
801 if (link->state != LINK_STATE_CONFIGURING)
802 return;
803
804 log_link_info(link, "Configured");
805
806 link_set_state(link, LINK_STATE_CONFIGURED);
807
808 (void) link_join_netdevs_after_configured(link);
809
810 link_dirty(link);
811 }
812
813 static int link_request_set_routing_policy_rule(Link *link) {
814 RoutingPolicyRule *rule, *rrule = NULL;
815 int r;
816
817 assert(link);
818 assert(link->network);
819
820 link_set_state(link, LINK_STATE_CONFIGURING);
821 link->routing_policy_rules_configured = false;
822
823 LIST_FOREACH(rules, rule, link->network->rules) {
824 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
825 rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif,
826 rule->protocol, &rule->sport, &rule->dport, &rrule);
827 if (r == 0) {
828 (void) routing_policy_rule_make_local(link->manager, rrule);
829 continue;
830 }
831
832 r = routing_policy_rule_configure(rule, link, NULL, false);
833 if (r < 0) {
834 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
835 link_enter_failed(link);
836 return r;
837 }
838
839 link->routing_policy_rule_messages++;
840 }
841
842 routing_policy_rule_purge(link->manager, link);
843 if (link->routing_policy_rule_messages == 0) {
844 link->routing_policy_rules_configured = true;
845 link_check_ready(link);
846 } else
847 log_link_debug(link, "Setting routing policy rules");
848
849 return 0;
850 }
851
852 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
853 int r;
854
855 assert(link);
856 assert(link->route_messages > 0);
857 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
858 LINK_STATE_FAILED, LINK_STATE_LINGER));
859
860 link->route_messages--;
861
862 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
863 return 1;
864
865 r = sd_netlink_message_get_errno(m);
866 if (r < 0 && r != -EEXIST)
867 log_link_warning_errno(link, r, "Could not set route: %m");
868
869 if (link->route_messages == 0) {
870 log_link_debug(link, "Routes set");
871 link->static_routes_configured = true;
872 link_check_ready(link);
873 }
874
875 return 1;
876 }
877
878 int link_request_set_routes(Link *link) {
879 enum {
880 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
881 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
882 _PHASE_MAX
883 } phase;
884 Route *rt;
885 int r;
886
887 assert(link);
888 assert(link->network);
889 assert(link->addresses_configured);
890 assert(link->address_messages == 0);
891 assert(link->state != _LINK_STATE_INVALID);
892
893 link_set_state(link, LINK_STATE_CONFIGURING);
894 link->static_routes_configured = false;
895
896 r = link_request_set_routing_policy_rule(link);
897 if (r < 0)
898 return r;
899
900 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
901 for (phase = 0; phase < _PHASE_MAX; phase++)
902 LIST_FOREACH(routes, rt, link->network->static_routes) {
903
904 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
905 continue;
906
907 r = route_configure(rt, link, route_handler);
908 if (r < 0) {
909 log_link_warning_errno(link, r, "Could not set routes: %m");
910 link_enter_failed(link);
911 return r;
912 }
913
914 link->route_messages++;
915 }
916
917 if (link->route_messages == 0) {
918 link->static_routes_configured = true;
919 link_check_ready(link);
920 } else
921 log_link_debug(link, "Setting routes");
922
923 return 0;
924 }
925
926 void link_check_ready(Link *link) {
927 Address *a;
928 Iterator i;
929
930 assert(link);
931
932 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
933 return;
934
935 if (!link->network)
936 return;
937
938 if (!link->addresses_configured)
939 return;
940
941 if (!link->neighbors_configured)
942 return;
943
944 SET_FOREACH(a, link->addresses, i)
945 if (!address_is_ready(a))
946 return;
947
948 if (!link->addresses_ready) {
949 link->addresses_ready = true;
950 link_request_set_routes(link);
951 return;
952 }
953
954 if (!link->static_routes_configured)
955 return;
956
957 if (!link->routing_policy_rules_configured)
958 return;
959
960 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !(link->ipv4ll_address && link->ipv4ll_route))
961 return;
962
963 if (link_ipv6ll_enabled(link) &&
964 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
965 return;
966
967 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
968 !link->dhcp4_configured &&
969 !link->dhcp6_configured &&
970 !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address && link->ipv4ll_route))
971 /* When DHCP is enabled, at least one protocol must provide an address, or
972 * an IPv4ll fallback address must be configured. */
973 return;
974
975 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
976 return;
977
978 if (link->state != LINK_STATE_CONFIGURED)
979 link_enter_configured(link);
980
981 return;
982 }
983
984 static int link_request_set_neighbors(Link *link) {
985 Neighbor *neighbor;
986 int r;
987
988 assert(link);
989 assert(link->network);
990 assert(link->state != _LINK_STATE_INVALID);
991
992 link_set_state(link, LINK_STATE_CONFIGURING);
993 link->neighbors_configured = false;
994
995 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
996 r = neighbor_configure(neighbor, link, NULL);
997 if (r < 0) {
998 log_link_warning_errno(link, r, "Could not set neighbor: %m");
999 link_enter_failed(link);
1000 return r;
1001 }
1002 }
1003
1004 if (link->neighbor_messages == 0) {
1005 link->neighbors_configured = true;
1006 link_check_ready(link);
1007 } else
1008 log_link_debug(link, "Setting neighbors");
1009
1010 return 0;
1011 }
1012
1013 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1014 int r;
1015
1016 assert(rtnl);
1017 assert(m);
1018 assert(link);
1019 assert(link->ifname);
1020 assert(link->address_messages > 0);
1021 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1022 LINK_STATE_FAILED, LINK_STATE_LINGER));
1023
1024 link->address_messages--;
1025
1026 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1027 return 1;
1028
1029 r = sd_netlink_message_get_errno(m);
1030 if (r < 0 && r != -EEXIST)
1031 log_link_warning_errno(link, r, "could not set address: %m");
1032 else if (r >= 0)
1033 manager_rtnl_process_address(rtnl, m, link->manager);
1034
1035 if (link->address_messages == 0) {
1036 log_link_debug(link, "Addresses set");
1037 link->addresses_configured = true;
1038 link_check_ready(link);
1039 }
1040
1041 return 1;
1042 }
1043
1044 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1045 _cleanup_free_ struct in_addr *addresses = NULL;
1046 size_t n_addresses = 0, n_allocated = 0;
1047 unsigned i;
1048
1049 log_debug("Copying DNS server information from %s", link->ifname);
1050
1051 if (!link->network)
1052 return 0;
1053
1054 for (i = 0; i < link->network->n_dns; i++) {
1055 struct in_addr ia;
1056
1057 /* Only look for IPv4 addresses */
1058 if (link->network->dns[i].family != AF_INET)
1059 continue;
1060
1061 ia = link->network->dns[i].address.in;
1062
1063 /* Never propagate obviously borked data */
1064 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1065 continue;
1066
1067 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1068 return log_oom();
1069
1070 addresses[n_addresses++] = ia;
1071 }
1072
1073 if (link->network->dhcp_use_dns && link->dhcp_lease) {
1074 const struct in_addr *da = NULL;
1075 int j, n;
1076
1077 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
1078 if (n > 0) {
1079
1080 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1081 return log_oom();
1082
1083 for (j = 0; j < n; j++)
1084 if (in4_addr_is_non_local(&da[j]))
1085 addresses[n_addresses++] = da[j];
1086 }
1087 }
1088
1089 if (n_addresses <= 0)
1090 return 0;
1091
1092 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
1093 }
1094
1095 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1096 _cleanup_free_ struct in_addr *addresses = NULL;
1097 size_t n_addresses = 0, n_allocated = 0;
1098 char **a;
1099
1100 if (!link->network)
1101 return 0;
1102
1103 log_debug("Copying NTP server information from %s", link->ifname);
1104
1105 STRV_FOREACH(a, link->network->ntp) {
1106 union in_addr_union ia;
1107
1108 /* Only look for IPv4 addresses */
1109 if (in_addr_from_string(AF_INET, *a, &ia) <= 0)
1110 continue;
1111
1112 /* Never propagate obviously borked data */
1113 if (in4_addr_is_null(&ia.in) || in4_addr_is_localhost(&ia.in))
1114 continue;
1115
1116 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1117 return log_oom();
1118
1119 addresses[n_addresses++] = ia.in;
1120 }
1121
1122 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1123 const struct in_addr *da = NULL;
1124 int j, n;
1125
1126 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1127 if (n > 0) {
1128
1129 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1130 return log_oom();
1131
1132 for (j = 0; j < n; j++)
1133 if (in4_addr_is_non_local(&da[j]))
1134 addresses[n_addresses++] = da[j];
1135 }
1136 }
1137
1138 if (n_addresses <= 0)
1139 return 0;
1140
1141 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1142 }
1143
1144 static int link_set_bridge_fdb(Link *link) {
1145 FdbEntry *fdb_entry;
1146 int r;
1147
1148 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1149 r = fdb_entry_configure(link, fdb_entry);
1150 if (r < 0)
1151 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1152 }
1153
1154 return 0;
1155 }
1156
1157 static int link_request_set_addresses(Link *link) {
1158 AddressLabel *label;
1159 Address *ad;
1160 int r;
1161
1162 assert(link);
1163 assert(link->network);
1164 assert(link->state != _LINK_STATE_INVALID);
1165
1166 link_set_state(link, LINK_STATE_CONFIGURING);
1167
1168 /* Reset all *_configured flags we are configuring. */
1169 link->addresses_configured = false;
1170 link->addresses_ready = false;
1171 link->neighbors_configured = false;
1172 link->static_routes_configured = false;
1173 link->routing_policy_rules_configured = false;
1174
1175 r = link_set_bridge_fdb(link);
1176 if (r < 0)
1177 return r;
1178
1179 r = link_request_set_neighbors(link);
1180 if (r < 0)
1181 return r;
1182
1183 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1184 bool update;
1185
1186 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1187
1188 r = address_configure(ad, link, address_handler, update);
1189 if (r < 0) {
1190 log_link_warning_errno(link, r, "Could not set addresses: %m");
1191 link_enter_failed(link);
1192 return r;
1193 }
1194
1195 link->address_messages++;
1196 }
1197
1198 LIST_FOREACH(labels, label, link->network->address_labels) {
1199 r = address_label_configure(label, link, NULL, false);
1200 if (r < 0) {
1201 log_link_warning_errno(link, r, "Could not set address label: %m");
1202 link_enter_failed(link);
1203 return r;
1204 }
1205
1206 link->address_label_messages++;
1207 }
1208
1209 /* now that we can figure out a default address for the dhcp server,
1210 start it */
1211 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1212 Address *address;
1213 Link *uplink = NULL;
1214 bool acquired_uplink = false;
1215
1216 address = link_find_dhcp_server_address(link);
1217 if (!address) {
1218 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1219 link_enter_failed(link);
1220 return 0;
1221 }
1222
1223 /* use the server address' subnet as the pool */
1224 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1225 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1226 if (r < 0)
1227 return r;
1228
1229 /* TODO:
1230 r = sd_dhcp_server_set_router(link->dhcp_server,
1231 &main_address->in_addr.in);
1232 if (r < 0)
1233 return r;
1234 */
1235
1236 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1237 r = sd_dhcp_server_set_max_lease_time(
1238 link->dhcp_server,
1239 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1240 if (r < 0)
1241 return r;
1242 }
1243
1244 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1245 r = sd_dhcp_server_set_default_lease_time(
1246 link->dhcp_server,
1247 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1248 if (r < 0)
1249 return r;
1250 }
1251
1252 if (link->network->dhcp_server_emit_dns) {
1253
1254 if (link->network->n_dhcp_server_dns > 0)
1255 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1256 else {
1257 uplink = manager_find_uplink(link->manager, link);
1258 acquired_uplink = true;
1259
1260 if (!uplink) {
1261 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1262 r = 0;
1263 } else
1264 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1265 }
1266 if (r < 0)
1267 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1268 }
1269
1270 if (link->network->dhcp_server_emit_ntp) {
1271
1272 if (link->network->n_dhcp_server_ntp > 0)
1273 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1274 else {
1275 if (!acquired_uplink)
1276 uplink = manager_find_uplink(link->manager, link);
1277
1278 if (!uplink) {
1279 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1280 r = 0;
1281 } else
1282 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1283
1284 }
1285 if (r < 0)
1286 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1287 }
1288
1289 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1290 if (r < 0)
1291 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1292
1293 if (link->network->dhcp_server_emit_timezone) {
1294 _cleanup_free_ char *buffer = NULL;
1295 const char *tz = NULL;
1296
1297 if (link->network->dhcp_server_timezone)
1298 tz = link->network->dhcp_server_timezone;
1299 else {
1300 r = get_timezone(&buffer);
1301 if (r < 0)
1302 log_warning_errno(r, "Failed to determine timezone: %m");
1303 else
1304 tz = buffer;
1305 }
1306
1307 if (tz) {
1308 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1309 if (r < 0)
1310 return r;
1311 }
1312 }
1313 if (!sd_dhcp_server_is_running(link->dhcp_server)) {
1314 r = sd_dhcp_server_start(link->dhcp_server);
1315 if (r < 0) {
1316 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1317
1318 link_enter_failed(link);
1319
1320 return 0;
1321 }
1322 }
1323
1324 log_link_debug(link, "Offering DHCPv4 leases");
1325 }
1326
1327 if (link->address_messages == 0) {
1328 link->addresses_configured = true;
1329 link_check_ready(link);
1330 } else
1331 log_link_debug(link, "Setting addresses");
1332
1333 return 0;
1334 }
1335
1336 static int link_set_bridge_vlan(Link *link) {
1337 int r;
1338
1339 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1340 if (r < 0)
1341 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1342
1343 return r;
1344 }
1345
1346 static int link_set_proxy_arp(Link *link) {
1347 int r;
1348
1349 if (!link_proxy_arp_enabled(link))
1350 return 0;
1351
1352 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1353 if (r < 0)
1354 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1355
1356 return 0;
1357 }
1358
1359 static int link_configure_after_setting_mtu(Link *link);
1360
1361 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1362 int r;
1363
1364 assert(m);
1365 assert(link);
1366 assert(link->ifname);
1367
1368 link->setting_mtu = false;
1369
1370 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1371 return 1;
1372
1373 r = sd_netlink_message_get_errno(m);
1374 if (r < 0) {
1375 log_link_warning_errno(link, r, "Could not set MTU: %m");
1376 return 1;
1377 }
1378
1379 log_link_debug(link, "Setting MTU done.");
1380
1381 if (link->state == LINK_STATE_INITIALIZED)
1382 (void) link_configure_after_setting_mtu(link);
1383
1384 return 1;
1385 }
1386
1387 int link_set_mtu(Link *link, uint32_t mtu) {
1388 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1389 int r;
1390
1391 assert(link);
1392 assert(link->manager);
1393 assert(link->manager->rtnl);
1394
1395 if (mtu == 0 || link->setting_mtu)
1396 return 0;
1397
1398 if (link->mtu == mtu)
1399 return 0;
1400
1401 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1402
1403 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1404 if (r < 0)
1405 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1406
1407 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1408 * for this interface, then disable IPv6 else enable it. */
1409 (void) link_enable_ipv6(link);
1410
1411 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1412 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1413 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1414
1415 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1416 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1417
1418 mtu = IPV6_MIN_MTU;
1419 }
1420
1421 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1422 if (r < 0)
1423 return log_link_error_errno(link, r, "Could not append MTU: %m");
1424
1425 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1426 link_netlink_destroy_callback, link);
1427 if (r < 0)
1428 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1429
1430 link_ref(link);
1431 link->setting_mtu = true;
1432
1433 return 0;
1434 }
1435
1436 static bool link_reduces_vlan_mtu(Link *link) {
1437 /* See netif_reduces_vlan_mtu() in kernel. */
1438 return streq_ptr(link->kind, "macsec");
1439 }
1440
1441 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1442 uint32_t mtu = 0;
1443 NetDev *dev;
1444 Iterator i;
1445
1446 HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1447 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1448 /* See vlan_dev_change_mtu() in kernel. */
1449 mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1450
1451 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1452 /* See macvlan_change_mtu() in kernel. */
1453 mtu = dev->mtu;
1454
1455 return mtu;
1456 }
1457
1458 static int link_configure_mtu(Link *link) {
1459 uint32_t mtu;
1460
1461 assert(link);
1462 assert(link->network);
1463
1464 if (link->network->mtu > 0)
1465 return link_set_mtu(link, link->network->mtu);
1466
1467 mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1468 if (link->mtu >= mtu)
1469 return 0;
1470
1471 log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1472 "If it is not desired, then please explicitly specify MTUBytes= setting.",
1473 link->mtu, mtu);
1474
1475 return link_set_mtu(link, mtu);
1476 }
1477
1478 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1479 int r;
1480
1481 assert(m);
1482 assert(link);
1483 assert(link->ifname);
1484
1485 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1486 return 1;
1487
1488 r = sd_netlink_message_get_errno(m);
1489 if (r < 0)
1490 log_link_warning_errno(link, r, "Could not set link flags: %m");
1491
1492 return 1;
1493 }
1494
1495 static int link_set_flags(Link *link) {
1496 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1497 unsigned ifi_change = 0;
1498 unsigned ifi_flags = 0;
1499 int r;
1500
1501 assert(link);
1502 assert(link->manager);
1503 assert(link->manager->rtnl);
1504
1505 if (link->flags & IFF_LOOPBACK)
1506 return 0;
1507
1508 if (!link->network)
1509 return 0;
1510
1511 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1512 return 0;
1513
1514 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1515 if (r < 0)
1516 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1517
1518 if (link->network->arp >= 0) {
1519 ifi_change |= IFF_NOARP;
1520 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1521 }
1522
1523 if (link->network->multicast >= 0) {
1524 ifi_change |= IFF_MULTICAST;
1525 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1526 }
1527
1528 if (link->network->allmulticast >= 0) {
1529 ifi_change |= IFF_ALLMULTI;
1530 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1531 }
1532
1533 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1534 if (r < 0)
1535 return log_link_error_errno(link, r, "Could not set link flags: %m");
1536
1537 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1538 link_netlink_destroy_callback, link);
1539 if (r < 0)
1540 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1541
1542 link_ref(link);
1543
1544 return 0;
1545 }
1546
1547 static int link_acquire_ipv6_conf(Link *link) {
1548 int r;
1549
1550 assert(link);
1551
1552 if (link_ipv6_accept_ra_enabled(link)) {
1553 assert(link->ndisc);
1554
1555 log_link_debug(link, "Discovering IPv6 routers");
1556
1557 r = sd_ndisc_start(link->ndisc);
1558 if (r < 0 && r != -EBUSY)
1559 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1560 }
1561
1562 if (link_radv_enabled(link)) {
1563 assert(link->radv);
1564 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1565
1566 log_link_debug(link, "Starting IPv6 Router Advertisements");
1567
1568 r = sd_radv_start(link->radv);
1569 if (r < 0 && r != -EBUSY)
1570 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1571 }
1572
1573 (void) dhcp6_request_prefix_delegation(link);
1574
1575 return 0;
1576 }
1577
1578 static int link_acquire_ipv4_conf(Link *link) {
1579 int r;
1580
1581 assert(link);
1582 assert(link->manager);
1583 assert(link->manager->event);
1584
1585 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1586 assert(link->ipv4ll);
1587
1588 log_link_debug(link, "Acquiring IPv4 link-local address");
1589
1590 r = sd_ipv4ll_start(link->ipv4ll);
1591 if (r < 0)
1592 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1593 }
1594
1595 if (link_dhcp4_enabled(link)) {
1596 assert(link->dhcp_client);
1597
1598 log_link_debug(link, "Acquiring DHCPv4 lease");
1599
1600 r = sd_dhcp_client_start(link->dhcp_client);
1601 if (r < 0)
1602 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1603 }
1604
1605 return 0;
1606 }
1607
1608 static int link_acquire_conf(Link *link) {
1609 int r;
1610
1611 assert(link);
1612
1613 r = link_acquire_ipv4_conf(link);
1614 if (r < 0)
1615 return r;
1616
1617 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1618 r = link_acquire_ipv6_conf(link);
1619 if (r < 0)
1620 return r;
1621 }
1622
1623 if (link_lldp_emit_enabled(link)) {
1624 r = link_lldp_emit_start(link);
1625 if (r < 0)
1626 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1627 }
1628
1629 return 0;
1630 }
1631
1632 bool link_has_carrier(Link *link) {
1633 /* see Documentation/networking/operstates.txt in the kernel sources */
1634
1635 if (link->kernel_operstate == IF_OPER_UP)
1636 return true;
1637
1638 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1639 /* operstate may not be implemented, so fall back to flags */
1640 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1641 !FLAGS_SET(link->flags, IFF_DORMANT))
1642 return true;
1643
1644 return false;
1645 }
1646
1647 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1648 int r;
1649
1650 assert(link);
1651
1652 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1653 return 1;
1654
1655 r = sd_netlink_message_get_errno(m);
1656 if (r < 0)
1657 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1658
1659 return 1;
1660 }
1661
1662 static int link_configure_addrgen_mode(Link *link) {
1663 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1664 uint8_t ipv6ll_mode;
1665 int r;
1666
1667 assert(link);
1668 assert(link->network);
1669 assert(link->manager);
1670 assert(link->manager->rtnl);
1671
1672 if (!socket_ipv6_is_supported())
1673 return 0;
1674
1675 log_link_debug(link, "Setting address genmode for link");
1676
1677 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1678 if (r < 0)
1679 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1680
1681 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1682 if (r < 0)
1683 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1684
1685 r = sd_netlink_message_open_container(req, AF_INET6);
1686 if (r < 0)
1687 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1688
1689 if (!link_ipv6ll_enabled(link))
1690 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1691 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1692 /* The file may not exist. And event if it exists, when stable_secret is unset,
1693 * reading the file fails with EIO. */
1694 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1695 else
1696 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1697
1698 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1699 if (r < 0)
1700 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1701
1702 r = sd_netlink_message_close_container(req);
1703 if (r < 0)
1704 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1705
1706 r = sd_netlink_message_close_container(req);
1707 if (r < 0)
1708 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1709
1710 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1711 link_netlink_destroy_callback, link);
1712 if (r < 0)
1713 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1714
1715 link_ref(link);
1716
1717 return 0;
1718 }
1719
1720 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1721 int r;
1722
1723 assert(link);
1724
1725 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1726 return 1;
1727
1728 r = sd_netlink_message_get_errno(m);
1729 if (r < 0)
1730 /* we warn but don't fail the link, as it may be brought up later */
1731 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1732
1733 return 1;
1734 }
1735
1736 static int link_up(Link *link) {
1737 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1738 int r;
1739
1740 assert(link);
1741 assert(link->network);
1742 assert(link->manager);
1743 assert(link->manager->rtnl);
1744
1745 log_link_debug(link, "Bringing link up");
1746
1747 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1748 if (r < 0)
1749 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1750
1751 /* set it free if not enslaved with networkd */
1752 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1753 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1754 if (r < 0)
1755 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1756 }
1757
1758 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1759 if (r < 0)
1760 return log_link_error_errno(link, r, "Could not set link flags: %m");
1761
1762 if (link->network->mac) {
1763 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1764 if (r < 0)
1765 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1766 }
1767
1768 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1769 link_netlink_destroy_callback, link);
1770 if (r < 0)
1771 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1772
1773 link_ref(link);
1774
1775 return 0;
1776 }
1777
1778 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1779 int r;
1780
1781 assert(link);
1782
1783 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1784 return 1;
1785
1786 r = sd_netlink_message_get_errno(m);
1787 if (r < 0)
1788 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1789
1790 return 1;
1791 }
1792
1793 int link_down(Link *link, link_netlink_message_handler_t callback) {
1794 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1795 int r;
1796
1797 assert(link);
1798 assert(link->manager);
1799 assert(link->manager->rtnl);
1800
1801 log_link_debug(link, "Bringing link down");
1802
1803 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1804 RTM_SETLINK, link->ifindex);
1805 if (r < 0)
1806 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1807
1808 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1809 if (r < 0)
1810 return log_link_error_errno(link, r, "Could not set link flags: %m");
1811
1812 r = netlink_call_async(link->manager->rtnl, NULL, req,
1813 callback ?: link_down_handler,
1814 link_netlink_destroy_callback, link);
1815 if (r < 0)
1816 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1817
1818 link_ref(link);
1819
1820 return 0;
1821 }
1822
1823 static int link_handle_bound_to_list(Link *link) {
1824 Link *l;
1825 Iterator i;
1826 int r;
1827 bool required_up = false;
1828 bool link_is_up = false;
1829
1830 assert(link);
1831
1832 if (hashmap_isempty(link->bound_to_links))
1833 return 0;
1834
1835 if (link->flags & IFF_UP)
1836 link_is_up = true;
1837
1838 HASHMAP_FOREACH (l, link->bound_to_links, i)
1839 if (link_has_carrier(l)) {
1840 required_up = true;
1841 break;
1842 }
1843
1844 if (!required_up && link_is_up) {
1845 r = link_down(link, NULL);
1846 if (r < 0)
1847 return r;
1848 } else if (required_up && !link_is_up) {
1849 r = link_up(link);
1850 if (r < 0)
1851 return r;
1852 }
1853
1854 return 0;
1855 }
1856
1857 static int link_handle_bound_by_list(Link *link) {
1858 Iterator i;
1859 Link *l;
1860 int r;
1861
1862 assert(link);
1863
1864 if (hashmap_isempty(link->bound_by_links))
1865 return 0;
1866
1867 HASHMAP_FOREACH (l, link->bound_by_links, i) {
1868 r = link_handle_bound_to_list(l);
1869 if (r < 0)
1870 return r;
1871 }
1872
1873 return 0;
1874 }
1875
1876 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1877 int r;
1878
1879 assert(link);
1880 assert(carrier);
1881
1882 if (link == carrier)
1883 return 0;
1884
1885 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1886 return 0;
1887
1888 r = hashmap_ensure_allocated(h, NULL);
1889 if (r < 0)
1890 return r;
1891
1892 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1893 if (r < 0)
1894 return r;
1895
1896 return 0;
1897 }
1898
1899 static int link_new_bound_by_list(Link *link) {
1900 Manager *m;
1901 Link *carrier;
1902 Iterator i;
1903 int r;
1904 bool list_updated = false;
1905
1906 assert(link);
1907 assert(link->manager);
1908
1909 m = link->manager;
1910
1911 HASHMAP_FOREACH(carrier, m->links, i) {
1912 if (!carrier->network)
1913 continue;
1914
1915 if (strv_isempty(carrier->network->bind_carrier))
1916 continue;
1917
1918 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
1919 r = link_put_carrier(link, carrier, &link->bound_by_links);
1920 if (r < 0)
1921 return r;
1922
1923 list_updated = true;
1924 }
1925 }
1926
1927 if (list_updated)
1928 link_dirty(link);
1929
1930 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
1931 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1932 if (r < 0)
1933 return r;
1934
1935 link_dirty(carrier);
1936 }
1937
1938 return 0;
1939 }
1940
1941 static int link_new_bound_to_list(Link *link) {
1942 Manager *m;
1943 Link *carrier;
1944 Iterator i;
1945 int r;
1946 bool list_updated = false;
1947
1948 assert(link);
1949 assert(link->manager);
1950
1951 if (!link->network)
1952 return 0;
1953
1954 if (strv_isempty(link->network->bind_carrier))
1955 return 0;
1956
1957 m = link->manager;
1958
1959 HASHMAP_FOREACH (carrier, m->links, i) {
1960 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
1961 r = link_put_carrier(link, carrier, &link->bound_to_links);
1962 if (r < 0)
1963 return r;
1964
1965 list_updated = true;
1966 }
1967 }
1968
1969 if (list_updated)
1970 link_dirty(link);
1971
1972 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
1973 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
1974 if (r < 0)
1975 return r;
1976
1977 link_dirty(carrier);
1978 }
1979
1980 return 0;
1981 }
1982
1983 static int link_new_carrier_maps(Link *link) {
1984 int r;
1985
1986 r = link_new_bound_by_list(link);
1987 if (r < 0)
1988 return r;
1989
1990 r = link_handle_bound_by_list(link);
1991 if (r < 0)
1992 return r;
1993
1994 r = link_new_bound_to_list(link);
1995 if (r < 0)
1996 return r;
1997
1998 r = link_handle_bound_to_list(link);
1999 if (r < 0)
2000 return r;
2001
2002 return 0;
2003 }
2004
2005 static void link_free_bound_to_list(Link *link) {
2006 Link *bound_to;
2007 Iterator i;
2008
2009 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2010 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2011
2012 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2013 link_dirty(bound_to);
2014 }
2015
2016 return;
2017 }
2018
2019 static void link_free_bound_by_list(Link *link) {
2020 Link *bound_by;
2021 Iterator i;
2022
2023 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2024 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2025
2026 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2027 link_dirty(bound_by);
2028 link_handle_bound_to_list(bound_by);
2029 }
2030 }
2031
2032 return;
2033 }
2034
2035 static void link_free_carrier_maps(Link *link) {
2036 bool list_updated = false;
2037
2038 assert(link);
2039
2040 if (!hashmap_isempty(link->bound_to_links)) {
2041 link_free_bound_to_list(link);
2042 list_updated = true;
2043 }
2044
2045 if (!hashmap_isempty(link->bound_by_links)) {
2046 link_free_bound_by_list(link);
2047 list_updated = true;
2048 }
2049
2050 if (list_updated)
2051 link_dirty(link);
2052
2053 return;
2054 }
2055
2056 static int link_append_to_master(Link *link, NetDev *netdev) {
2057 Link *master;
2058 int r;
2059
2060 assert(link);
2061 assert(netdev);
2062
2063 r = link_get(link->manager, netdev->ifindex, &master);
2064 if (r < 0)
2065 return r;
2066
2067 r = set_ensure_allocated(&master->slaves, NULL);
2068 if (r < 0)
2069 return r;
2070
2071 r = set_put(master->slaves, link);
2072 if (r < 0)
2073 return r;
2074
2075 link_ref(link);
2076 return 0;
2077 }
2078
2079 static void link_drop_from_master(Link *link, NetDev *netdev) {
2080 Link *master;
2081
2082 assert(link);
2083
2084 if (!link->manager || !netdev)
2085 return;
2086
2087 if (link_get(link->manager, netdev->ifindex, &master) < 0)
2088 return;
2089
2090 link_unref(set_remove(master->slaves, link));
2091 }
2092
2093 static void link_detach_from_manager(Link *link) {
2094 if (!link || !link->manager)
2095 return;
2096
2097 link_unref(set_remove(link->manager->links_requesting_uuid, link));
2098 link_clean(link);
2099
2100 /* The following must be called at last. */
2101 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2102 link_unref(link);
2103 }
2104
2105 void link_drop(Link *link) {
2106 if (!link || link->state == LINK_STATE_LINGER)
2107 return;
2108
2109 link_set_state(link, LINK_STATE_LINGER);
2110
2111 link_free_carrier_maps(link);
2112
2113 if (link->network) {
2114 link_drop_from_master(link, link->network->bridge);
2115 link_drop_from_master(link, link->network->bond);
2116 }
2117
2118 log_link_debug(link, "Link removed");
2119
2120 (void) unlink(link->state_file);
2121 link_detach_from_manager(link);
2122 }
2123
2124 static int link_joined(Link *link) {
2125 int r;
2126
2127 assert(link);
2128 assert(link->network);
2129
2130 if (!hashmap_isempty(link->bound_to_links)) {
2131 r = link_handle_bound_to_list(link);
2132 if (r < 0)
2133 return r;
2134 } else if (!(link->flags & IFF_UP)) {
2135 r = link_up(link);
2136 if (r < 0) {
2137 link_enter_failed(link);
2138 return r;
2139 }
2140 }
2141
2142 if (link->network->bridge) {
2143 r = link_set_bridge(link);
2144 if (r < 0)
2145 log_link_error_errno(link, r, "Could not set bridge message: %m");
2146
2147 r = link_append_to_master(link, link->network->bridge);
2148 if (r < 0)
2149 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2150 }
2151
2152 if (link->network->bond) {
2153 r = link_set_bond(link);
2154 if (r < 0)
2155 log_link_error_errno(link, r, "Could not set bond message: %m");
2156
2157 r = link_append_to_master(link, link->network->bond);
2158 if (r < 0)
2159 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2160 }
2161
2162 if (link->network->use_br_vlan &&
2163 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2164 r = link_set_bridge_vlan(link);
2165 if (r < 0)
2166 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2167 }
2168
2169 /* Skip setting up addresses until it gets carrier,
2170 or it would try to set addresses twice,
2171 which is bad for non-idempotent steps. */
2172 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2173 return 0;
2174
2175 return link_request_set_addresses(link);
2176 }
2177
2178 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2179 int r;
2180
2181 assert(link);
2182 assert(link->network);
2183 assert(link->enslaving > 0);
2184
2185 link->enslaving--;
2186
2187 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2188 return 1;
2189
2190 r = sd_netlink_message_get_errno(m);
2191 if (r < 0 && r != -EEXIST) {
2192 log_link_error_errno(link, r, "Could not join netdev: %m");
2193 link_enter_failed(link);
2194 return 1;
2195 } else
2196 log_link_debug(link, "Joined netdev");
2197
2198 if (link->enslaving == 0) {
2199 link_joined(link);
2200 }
2201
2202 return 1;
2203 }
2204
2205 static int link_enter_join_netdev(Link *link) {
2206 NetDev *netdev;
2207 Iterator i;
2208 int r;
2209
2210 assert(link);
2211 assert(link->network);
2212 assert(link->state == LINK_STATE_INITIALIZED);
2213
2214 link_set_state(link, LINK_STATE_CONFIGURING);
2215
2216 link_dirty(link);
2217 link->enslaving = 0;
2218
2219 if (link->network->bond) {
2220 if (link->network->bond->state == NETDEV_STATE_READY &&
2221 link->network->bond->ifindex == link->master_ifindex)
2222 return link_joined(link);
2223
2224 log_struct(LOG_DEBUG,
2225 LOG_LINK_INTERFACE(link),
2226 LOG_NETDEV_INTERFACE(link->network->bond),
2227 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2228
2229 link->enslaving++;
2230
2231 r = netdev_join(link->network->bond, link, netdev_join_handler);
2232 if (r < 0) {
2233 log_struct_errno(LOG_WARNING, r,
2234 LOG_LINK_INTERFACE(link),
2235 LOG_NETDEV_INTERFACE(link->network->bond),
2236 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2237 link_enter_failed(link);
2238 return r;
2239 }
2240 }
2241
2242 if (link->network->bridge) {
2243 log_struct(LOG_DEBUG,
2244 LOG_LINK_INTERFACE(link),
2245 LOG_NETDEV_INTERFACE(link->network->bridge),
2246 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2247
2248 link->enslaving++;
2249
2250 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2251 if (r < 0) {
2252 log_struct_errno(LOG_WARNING, r,
2253 LOG_LINK_INTERFACE(link),
2254 LOG_NETDEV_INTERFACE(link->network->bridge),
2255 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2256 link_enter_failed(link);
2257 return r;
2258 }
2259 }
2260
2261 if (link->network->vrf) {
2262 log_struct(LOG_DEBUG,
2263 LOG_LINK_INTERFACE(link),
2264 LOG_NETDEV_INTERFACE(link->network->vrf),
2265 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2266
2267 link->enslaving++;
2268
2269 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2270 if (r < 0) {
2271 log_struct_errno(LOG_WARNING, r,
2272 LOG_LINK_INTERFACE(link),
2273 LOG_NETDEV_INTERFACE(link->network->vrf),
2274 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2275 link_enter_failed(link);
2276 return r;
2277 }
2278 }
2279
2280 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2281
2282 if (netdev->ifindex > 0)
2283 /* Assume already enslaved. */
2284 continue;
2285
2286 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2287 continue;
2288
2289 log_struct(LOG_DEBUG,
2290 LOG_LINK_INTERFACE(link),
2291 LOG_NETDEV_INTERFACE(netdev),
2292 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2293
2294 link->enslaving++;
2295
2296 r = netdev_join(netdev, link, netdev_join_handler);
2297 if (r < 0) {
2298 log_struct_errno(LOG_WARNING, r,
2299 LOG_LINK_INTERFACE(link),
2300 LOG_NETDEV_INTERFACE(netdev),
2301 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2302 link_enter_failed(link);
2303 return r;
2304 }
2305 }
2306
2307 if (link->enslaving == 0)
2308 return link_joined(link);
2309
2310 return 0;
2311 }
2312
2313 static int link_set_ipv4_forward(Link *link) {
2314 int r;
2315
2316 if (!link_ipv4_forward_enabled(link))
2317 return 0;
2318
2319 /* We propagate the forwarding flag from one interface to the
2320 * global setting one way. This means: as long as at least one
2321 * interface was configured at any time that had IP forwarding
2322 * enabled the setting will stay on for good. We do this
2323 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2324 * somewhat in sync (see below). */
2325
2326 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2327 if (r < 0)
2328 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2329
2330 return 0;
2331 }
2332
2333 static int link_set_ipv6_forward(Link *link) {
2334 int r;
2335
2336 if (!link_ipv6_forward_enabled(link))
2337 return 0;
2338
2339 /* On Linux, the IPv6 stack does not know a per-interface
2340 * packet forwarding setting: either packet forwarding is on
2341 * for all, or off for all. We hence don't bother with a
2342 * per-interface setting, but simply propagate the interface
2343 * flag, if it is set, to the global flag, one-way. Note that
2344 * while IPv4 would allow a per-interface flag, we expose the
2345 * same behaviour there and also propagate the setting from
2346 * one to all, to keep things simple (see above). */
2347
2348 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2349 if (r < 0)
2350 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2351
2352 return 0;
2353 }
2354
2355 static int link_set_ipv6_privacy_extensions(Link *link) {
2356 IPv6PrivacyExtensions s;
2357 int r;
2358
2359 s = link_ipv6_privacy_extensions(link);
2360 if (s < 0)
2361 return 0;
2362
2363 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2364 if (r < 0)
2365 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2366
2367 return 0;
2368 }
2369
2370 static int link_set_ipv6_accept_ra(Link *link) {
2371 int r;
2372
2373 /* Make this a NOP if IPv6 is not available */
2374 if (!socket_ipv6_is_supported())
2375 return 0;
2376
2377 if (link->flags & IFF_LOOPBACK)
2378 return 0;
2379
2380 if (!link->network)
2381 return 0;
2382
2383 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2384 if (r < 0)
2385 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2386
2387 return 0;
2388 }
2389
2390 static int link_set_ipv6_dad_transmits(Link *link) {
2391 int r;
2392
2393 /* Make this a NOP if IPv6 is not available */
2394 if (!socket_ipv6_is_supported())
2395 return 0;
2396
2397 if (link->flags & IFF_LOOPBACK)
2398 return 0;
2399
2400 if (!link->network)
2401 return 0;
2402
2403 if (link->network->ipv6_dad_transmits < 0)
2404 return 0;
2405
2406 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2407 if (r < 0)
2408 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2409
2410 return 0;
2411 }
2412
2413 static int link_set_ipv6_hop_limit(Link *link) {
2414 int r;
2415
2416 /* Make this a NOP if IPv6 is not available */
2417 if (!socket_ipv6_is_supported())
2418 return 0;
2419
2420 if (link->flags & IFF_LOOPBACK)
2421 return 0;
2422
2423 if (!link->network)
2424 return 0;
2425
2426 if (link->network->ipv6_hop_limit < 0)
2427 return 0;
2428
2429 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2430 if (r < 0)
2431 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2432
2433 return 0;
2434 }
2435
2436 static int link_set_ipv6_mtu(Link *link) {
2437 int r;
2438
2439 /* Make this a NOP if IPv6 is not available */
2440 if (!socket_ipv6_is_supported())
2441 return 0;
2442
2443 if (link->flags & IFF_LOOPBACK)
2444 return 0;
2445
2446 if (link->network->ipv6_mtu == 0)
2447 return 0;
2448
2449 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2450 if (r < 0)
2451 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2452
2453 return 0;
2454 }
2455
2456 static bool link_is_static_address_configured(Link *link, Address *address) {
2457 Address *net_address;
2458
2459 assert(link);
2460 assert(address);
2461
2462 if (!link->network)
2463 return false;
2464
2465 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2466 if (address_equal(net_address, address))
2467 return true;
2468
2469 return false;
2470 }
2471
2472 static bool link_is_static_route_configured(Link *link, Route *route) {
2473 Route *net_route;
2474
2475 assert(link);
2476 assert(route);
2477
2478 if (!link->network)
2479 return false;
2480
2481 LIST_FOREACH(routes, net_route, link->network->static_routes)
2482 if (route_equal(net_route, route))
2483 return true;
2484
2485 return false;
2486 }
2487
2488 static int link_drop_foreign_config(Link *link) {
2489 Address *address;
2490 Route *route;
2491 Iterator i;
2492 int r;
2493
2494 SET_FOREACH(address, link->addresses_foreign, i) {
2495 /* we consider IPv6LL addresses to be managed by the kernel */
2496 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2497 continue;
2498
2499 if (link_is_static_address_configured(link, address)) {
2500 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2501 if (r < 0)
2502 return log_link_error_errno(link, r, "Failed to add address: %m");
2503 } else {
2504 r = address_remove(address, link, NULL);
2505 if (r < 0)
2506 return r;
2507 }
2508 }
2509
2510 SET_FOREACH(route, link->routes_foreign, i) {
2511 /* do not touch routes managed by the kernel */
2512 if (route->protocol == RTPROT_KERNEL)
2513 continue;
2514
2515 if (link_is_static_route_configured(link, route)) {
2516 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2517 if (r < 0)
2518 return r;
2519 } else {
2520 r = route_remove(route, link, NULL);
2521 if (r < 0)
2522 return r;
2523 }
2524 }
2525
2526 return 0;
2527 }
2528
2529 static int link_drop_config(Link *link) {
2530 Address *address, *pool_address;
2531 Route *route;
2532 Iterator i;
2533 int r;
2534
2535 SET_FOREACH(address, link->addresses, i) {
2536 /* we consider IPv6LL addresses to be managed by the kernel */
2537 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2538 continue;
2539
2540 r = address_remove(address, link, NULL);
2541 if (r < 0)
2542 return r;
2543
2544 /* If this address came from an address pool, clean up the pool */
2545 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2546 if (address_equal(address, pool_address)) {
2547 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2548 address_free(pool_address);
2549 break;
2550 }
2551 }
2552 }
2553
2554 SET_FOREACH(route, link->routes, i) {
2555 /* do not touch routes managed by the kernel */
2556 if (route->protocol == RTPROT_KERNEL)
2557 continue;
2558
2559 r = route_remove(route, link, NULL);
2560 if (r < 0)
2561 return r;
2562 }
2563
2564 ndisc_flush(link);
2565
2566 return 0;
2567 }
2568
2569 static int link_configure(Link *link) {
2570 int r;
2571
2572 assert(link);
2573 assert(link->network);
2574 assert(link->state == LINK_STATE_INITIALIZED);
2575
2576 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
2577 return link_configure_can(link);
2578
2579 /* Drop foreign config, but ignore loopback or critical devices.
2580 * We do not want to remove loopback address or addresses used for root NFS. */
2581 if (!(link->flags & IFF_LOOPBACK) &&
2582 !(link->network->keep_configuration & (KEEP_CONFIGURATION_DHCP | KEEP_CONFIGURATION_STATIC))) {
2583 r = link_drop_foreign_config(link);
2584 if (r < 0)
2585 return r;
2586 }
2587
2588 r = link_set_proxy_arp(link);
2589 if (r < 0)
2590 return r;
2591
2592 r = ipv6_proxy_ndp_addresses_configure(link);
2593 if (r < 0)
2594 return r;
2595
2596 r = link_set_ipv4_forward(link);
2597 if (r < 0)
2598 return r;
2599
2600 r = link_set_ipv6_forward(link);
2601 if (r < 0)
2602 return r;
2603
2604 r = link_set_ipv6_privacy_extensions(link);
2605 if (r < 0)
2606 return r;
2607
2608 r = link_set_ipv6_accept_ra(link);
2609 if (r < 0)
2610 return r;
2611
2612 r = link_set_ipv6_dad_transmits(link);
2613 if (r < 0)
2614 return r;
2615
2616 r = link_set_ipv6_hop_limit(link);
2617 if (r < 0)
2618 return r;
2619
2620 r = link_set_flags(link);
2621 if (r < 0)
2622 return r;
2623
2624 r = link_set_ipv6_mtu(link);
2625 if (r < 0)
2626 return r;
2627
2628 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
2629 r = ipv4ll_configure(link);
2630 if (r < 0)
2631 return r;
2632 }
2633
2634 if (link_dhcp4_enabled(link)) {
2635 r = dhcp4_set_promote_secondaries(link);
2636 if (r < 0)
2637 return r;
2638
2639 r = dhcp4_configure(link);
2640 if (r < 0)
2641 return r;
2642 }
2643
2644 if (link_dhcp4_server_enabled(link)) {
2645 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2646 if (r < 0)
2647 return r;
2648
2649 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2650 if (r < 0)
2651 return r;
2652 }
2653
2654 if (link_dhcp6_enabled(link) ||
2655 link_ipv6_accept_ra_enabled(link)) {
2656 r = dhcp6_configure(link);
2657 if (r < 0)
2658 return r;
2659 }
2660
2661 if (link_ipv6_accept_ra_enabled(link)) {
2662 r = ndisc_configure(link);
2663 if (r < 0)
2664 return r;
2665 }
2666
2667 if (link_radv_enabled(link)) {
2668 r = radv_configure(link);
2669 if (r < 0)
2670 return r;
2671 }
2672
2673 if (link_lldp_rx_enabled(link)) {
2674 r = link_lldp_rx_configure(link);
2675 if (r < 0)
2676 return r;
2677 }
2678
2679 r = link_configure_mtu(link);
2680 if (r < 0)
2681 return r;
2682
2683 r = link_configure_addrgen_mode(link);
2684 if (r < 0)
2685 return r;
2686
2687 return link_configure_after_setting_mtu(link);
2688 }
2689
2690 static int link_configure_after_setting_mtu(Link *link) {
2691 int r;
2692
2693 assert(link);
2694 assert(link->network);
2695 assert(link->state == LINK_STATE_INITIALIZED);
2696
2697 if (link->setting_mtu)
2698 return 0;
2699
2700 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2701 r = link_acquire_conf(link);
2702 if (r < 0)
2703 return r;
2704 }
2705
2706 return link_enter_join_netdev(link);
2707 }
2708
2709 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
2710 assert(duid);
2711
2712 if (duid->raw_data_len > 0)
2713 return 0;
2714
2715 if (duid->type != DUID_TYPE_UUID)
2716 return -EINVAL;
2717
2718 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
2719 duid->raw_data_len = sizeof(sd_id128_t);
2720
2721 return 1;
2722 }
2723
2724 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
2725 Manager *manager = userdata;
2726 const sd_bus_error *e;
2727 const void *a;
2728 size_t sz;
2729 DUID *duid;
2730 Link *link;
2731 int r;
2732
2733 assert(m);
2734 assert(manager);
2735
2736 e = sd_bus_message_get_error(m);
2737 if (e) {
2738 log_error_errno(sd_bus_error_get_errno(e),
2739 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
2740 e->message);
2741 goto configure;
2742 }
2743
2744 r = sd_bus_message_read_array(m, 'y', &a, &sz);
2745 if (r < 0)
2746 goto configure;
2747
2748 if (sz != sizeof(sd_id128_t)) {
2749 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
2750 goto configure;
2751 }
2752
2753 memcpy(&manager->product_uuid, a, sz);
2754 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
2755 (void) duid_set_uuid(duid, manager->product_uuid);
2756
2757 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
2758
2759 configure:
2760 while ((link = set_steal_first(manager->links_requesting_uuid))) {
2761 r = link_configure(link);
2762 if (r < 0)
2763 log_link_error_errno(link, r, "Failed to configure link: %m");
2764 }
2765
2766 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
2767
2768 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
2769 * even if the method fails. */
2770 manager->has_product_uuid = true;
2771
2772 return 1;
2773 }
2774
2775 static bool link_requires_uuid(Link *link) {
2776 const DUID *duid;
2777
2778 assert(link);
2779 assert(link->manager);
2780 assert(link->network);
2781
2782 duid = link_get_duid(link);
2783 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
2784 return false;
2785
2786 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
2787 return true;
2788
2789 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
2790 return true;
2791
2792 return false;
2793 }
2794
2795 static int link_configure_duid(Link *link) {
2796 Manager *m;
2797 DUID *duid;
2798 int r;
2799
2800 assert(link);
2801 assert(link->manager);
2802 assert(link->network);
2803
2804 m = link->manager;
2805 duid = link_get_duid(link);
2806
2807 if (!link_requires_uuid(link))
2808 return 1;
2809
2810 if (m->has_product_uuid) {
2811 (void) duid_set_uuid(duid, m->product_uuid);
2812 return 1;
2813 }
2814
2815 if (!m->links_requesting_uuid) {
2816 r = manager_request_product_uuid(m, link);
2817 if (r < 0) {
2818 if (r == -ENOMEM)
2819 return r;
2820
2821 log_link_warning_errno(link, r,
2822 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
2823 return 1;
2824 }
2825 } else {
2826 r = set_put(m->links_requesting_uuid, link);
2827 if (r < 0)
2828 return log_oom();
2829
2830 r = set_put(m->duids_requesting_uuid, duid);
2831 if (r < 0)
2832 return log_oom();
2833 }
2834
2835 return 0;
2836 }
2837
2838 static int link_initialized_and_synced(Link *link) {
2839 Network *network;
2840 int r;
2841
2842 assert(link);
2843 assert(link->ifname);
2844 assert(link->manager);
2845
2846 /* We may get called either from the asynchronous netlink callback,
2847 * or directly for link_add() if running in a container. See link_add(). */
2848 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
2849 return 0;
2850
2851 log_link_debug(link, "Link state is up-to-date");
2852 link_set_state(link, LINK_STATE_INITIALIZED);
2853
2854 r = link_new_bound_by_list(link);
2855 if (r < 0)
2856 return r;
2857
2858 r = link_handle_bound_by_list(link);
2859 if (r < 0)
2860 return r;
2861
2862 if (!link->network) {
2863 r = network_get(link->manager, link->sd_device, link->ifname,
2864 &link->mac, &network);
2865 if (r == -ENOENT) {
2866 link_enter_unmanaged(link);
2867 return 0;
2868 } else if (r == 0 && network->unmanaged) {
2869 link_enter_unmanaged(link);
2870 return 0;
2871 } else if (r < 0)
2872 return r;
2873
2874 if (link->flags & IFF_LOOPBACK) {
2875 if (network->link_local != ADDRESS_FAMILY_NO)
2876 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2877
2878 if (network->dhcp != ADDRESS_FAMILY_NO)
2879 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2880
2881 if (network->dhcp_server)
2882 log_link_debug(link, "Ignoring DHCP server for loopback link");
2883 }
2884
2885 r = network_apply(network, link);
2886 if (r < 0)
2887 return r;
2888 }
2889
2890 r = link_new_bound_to_list(link);
2891 if (r < 0)
2892 return r;
2893
2894 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
2895 * link_configure() is called later asynchronously. */
2896 r = link_configure_duid(link);
2897 if (r <= 0)
2898 return r;
2899
2900 r = link_configure(link);
2901 if (r < 0)
2902 return r;
2903
2904 return 0;
2905 }
2906
2907 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2908 (void) link_initialized_and_synced(link);
2909 return 1;
2910 }
2911
2912 int link_initialized(Link *link, sd_device *device) {
2913 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2914 int r;
2915
2916 assert(link);
2917 assert(link->manager);
2918 assert(link->manager->rtnl);
2919 assert(device);
2920
2921 if (link->state != LINK_STATE_PENDING)
2922 return 0;
2923
2924 if (link->sd_device)
2925 return 0;
2926
2927 log_link_debug(link, "udev initialized link");
2928 link_set_state(link, LINK_STATE_INITIALIZED);
2929
2930 link->sd_device = sd_device_ref(device);
2931
2932 /* udev has initialized the link, but we don't know if we have yet
2933 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2934 * when it returns we know that the pending NEWLINKs have already been
2935 * processed and that we are up-to-date */
2936
2937 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2938 link->ifindex);
2939 if (r < 0)
2940 return r;
2941
2942 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
2943 link_netlink_destroy_callback, link);
2944 if (r < 0)
2945 return r;
2946
2947 link_ref(link);
2948
2949 return 0;
2950 }
2951
2952 static int link_load(Link *link) {
2953 _cleanup_free_ char *network_file = NULL,
2954 *addresses = NULL,
2955 *routes = NULL,
2956 *dhcp4_address = NULL,
2957 *ipv4ll_address = NULL;
2958 union in_addr_union address;
2959 union in_addr_union route_dst;
2960 const char *p;
2961 int r;
2962
2963 assert(link);
2964
2965 r = parse_env_file(NULL, link->state_file,
2966 "NETWORK_FILE", &network_file,
2967 "ADDRESSES", &addresses,
2968 "ROUTES", &routes,
2969 "DHCP4_ADDRESS", &dhcp4_address,
2970 "IPV4LL_ADDRESS", &ipv4ll_address);
2971 if (r < 0 && r != -ENOENT)
2972 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
2973
2974 if (network_file) {
2975 Network *network;
2976 char *suffix;
2977
2978 /* drop suffix */
2979 suffix = strrchr(network_file, '.');
2980 if (!suffix) {
2981 log_link_debug(link, "Failed to get network name from %s", network_file);
2982 goto network_file_fail;
2983 }
2984 *suffix = '\0';
2985
2986 r = network_get_by_name(link->manager, basename(network_file), &network);
2987 if (r < 0) {
2988 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
2989 goto network_file_fail;
2990 }
2991
2992 r = network_apply(network, link);
2993 if (r < 0)
2994 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
2995 }
2996
2997 network_file_fail:
2998
2999 if (addresses) {
3000 p = addresses;
3001
3002 for (;;) {
3003 _cleanup_free_ char *address_str = NULL;
3004 char *prefixlen_str;
3005 int family;
3006 unsigned char prefixlen;
3007
3008 r = extract_first_word(&p, &address_str, NULL, 0);
3009 if (r < 0) {
3010 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3011 continue;
3012 }
3013 if (r == 0)
3014 break;
3015
3016 prefixlen_str = strchr(address_str, '/');
3017 if (!prefixlen_str) {
3018 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3019 continue;
3020 }
3021
3022 *prefixlen_str++ = '\0';
3023
3024 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3025 if (r != 1) {
3026 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3027 continue;
3028 }
3029
3030 r = in_addr_from_string_auto(address_str, &family, &address);
3031 if (r < 0) {
3032 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3033 continue;
3034 }
3035
3036 r = address_add(link, family, &address, prefixlen, NULL);
3037 if (r < 0)
3038 return log_link_error_errno(link, r, "Failed to add address: %m");
3039 }
3040 }
3041
3042 if (routes) {
3043 p = routes;
3044
3045 for (;;) {
3046 Route *route;
3047 _cleanup_free_ char *route_str = NULL;
3048 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3049 usec_t lifetime;
3050 char *prefixlen_str;
3051 int family;
3052 unsigned char prefixlen, tos, table;
3053 uint32_t priority;
3054
3055 r = extract_first_word(&p, &route_str, NULL, 0);
3056 if (r < 0) {
3057 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3058 continue;
3059 }
3060 if (r == 0)
3061 break;
3062
3063 prefixlen_str = strchr(route_str, '/');
3064 if (!prefixlen_str) {
3065 log_link_debug(link, "Failed to parse route %s", route_str);
3066 continue;
3067 }
3068
3069 *prefixlen_str++ = '\0';
3070
3071 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3072 if (r != 5) {
3073 log_link_debug(link,
3074 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3075 prefixlen_str);
3076 continue;
3077 }
3078
3079 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3080 if (r < 0) {
3081 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3082 continue;
3083 }
3084
3085 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3086 if (r < 0)
3087 return log_link_error_errno(link, r, "Failed to add route: %m");
3088
3089 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3090 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3091 0, route_expire_handler, route);
3092 if (r < 0)
3093 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3094 }
3095
3096 route->lifetime = lifetime;
3097 sd_event_source_unref(route->expire);
3098 route->expire = TAKE_PTR(expire);
3099 }
3100 }
3101
3102 if (dhcp4_address) {
3103 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3104 if (r < 0) {
3105 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3106 goto dhcp4_address_fail;
3107 }
3108
3109 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3110 if (r < 0)
3111 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3112
3113 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3114 if (r < 0)
3115 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3116 }
3117
3118 dhcp4_address_fail:
3119
3120 if (ipv4ll_address) {
3121 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3122 if (r < 0) {
3123 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3124 goto ipv4ll_address_fail;
3125 }
3126
3127 r = sd_ipv4ll_new(&link->ipv4ll);
3128 if (r < 0)
3129 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3130
3131 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3132 if (r < 0)
3133 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3134 }
3135
3136 ipv4ll_address_fail:
3137
3138 return 0;
3139 }
3140
3141 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3142 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3143 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3144 Link *link;
3145 int r;
3146
3147 assert(m);
3148 assert(m->rtnl);
3149 assert(message);
3150 assert(ret);
3151
3152 r = link_new(m, message, ret);
3153 if (r < 0)
3154 return r;
3155
3156 link = *ret;
3157
3158 log_link_debug(link, "Link %d added", link->ifindex);
3159
3160 r = link_load(link);
3161 if (r < 0)
3162 return r;
3163
3164 if (detect_container() <= 0) {
3165 /* not in a container, udev will be around */
3166 sprintf(ifindex_str, "n%d", link->ifindex);
3167 r = sd_device_new_from_device_id(&device, ifindex_str);
3168 if (r < 0) {
3169 log_link_warning_errno(link, r, "Could not find device: %m");
3170 goto failed;
3171 }
3172
3173 r = sd_device_get_is_initialized(device);
3174 if (r < 0) {
3175 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3176 goto failed;
3177 }
3178 if (r == 0) {
3179 /* not yet ready */
3180 log_link_debug(link, "link pending udev initialization...");
3181 return 0;
3182 }
3183
3184 r = device_is_renaming(device);
3185 if (r < 0) {
3186 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3187 goto failed;
3188 }
3189 if (r > 0) {
3190 log_link_debug(link, "Interface is under renaming, pending initialization.");
3191 return 0;
3192 }
3193
3194 r = link_initialized(link, device);
3195 if (r < 0)
3196 goto failed;
3197 } else {
3198 r = link_initialized_and_synced(link);
3199 if (r < 0)
3200 goto failed;
3201 }
3202
3203 return 0;
3204 failed:
3205 link_enter_failed(link);
3206 return r;
3207 }
3208
3209 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3210 int r;
3211
3212 assert(link);
3213
3214 log_link_info(link, "Gained IPv6LL");
3215
3216 link->ipv6ll_address = *address;
3217 link_check_ready(link);
3218
3219 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3220 r = link_acquire_ipv6_conf(link);
3221 if (r < 0) {
3222 link_enter_failed(link);
3223 return r;
3224 }
3225 }
3226
3227 return 0;
3228 }
3229
3230 static int link_carrier_gained(Link *link) {
3231 int r;
3232
3233 assert(link);
3234
3235 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3236 r = link_acquire_conf(link);
3237 if (r < 0) {
3238 link_enter_failed(link);
3239 return r;
3240 }
3241
3242 r = link_request_set_addresses(link);
3243 if (r < 0)
3244 return r;
3245 }
3246
3247 r = link_handle_bound_by_list(link);
3248 if (r < 0)
3249 return r;
3250
3251 return 0;
3252 }
3253
3254 static int link_carrier_lost(Link *link) {
3255 int r;
3256
3257 assert(link);
3258
3259 if (link->network && link->network->ignore_carrier_loss)
3260 return 0;
3261
3262 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3263 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3264 * configuration and stop the clients as well. */
3265 if (link->setting_mtu)
3266 return 0;
3267
3268 r = link_stop_clients(link);
3269 if (r < 0) {
3270 link_enter_failed(link);
3271 return r;
3272 }
3273
3274 if (link_dhcp4_server_enabled(link))
3275 (void) sd_dhcp_server_stop(link->dhcp_server);
3276
3277 r = link_drop_config(link);
3278 if (r < 0)
3279 return r;
3280
3281 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3282 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3283 r = link_drop_foreign_config(link);
3284 if (r < 0)
3285 return r;
3286 }
3287
3288 r = link_handle_bound_by_list(link);
3289 if (r < 0)
3290 return r;
3291
3292 return 0;
3293 }
3294
3295 int link_carrier_reset(Link *link) {
3296 int r;
3297
3298 assert(link);
3299
3300 if (link_has_carrier(link)) {
3301 r = link_carrier_lost(link);
3302 if (r < 0)
3303 return r;
3304
3305 r = link_carrier_gained(link);
3306 if (r < 0)
3307 return r;
3308
3309 log_link_info(link, "Reset carrier");
3310 }
3311
3312 return 0;
3313 }
3314
3315 int link_update(Link *link, sd_netlink_message *m) {
3316 struct ether_addr mac;
3317 const char *ifname;
3318 uint32_t mtu;
3319 bool had_carrier, carrier_gained, carrier_lost;
3320 int old_master, r;
3321
3322 assert(link);
3323 assert(link->ifname);
3324 assert(m);
3325
3326 if (link->state == LINK_STATE_LINGER) {
3327 log_link_info(link, "Link re-added");
3328 link_set_state(link, LINK_STATE_CONFIGURING);
3329
3330 r = link_new_carrier_maps(link);
3331 if (r < 0)
3332 return r;
3333 }
3334
3335 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3336 if (r >= 0 && !streq(ifname, link->ifname)) {
3337 Manager *manager = link->manager;
3338
3339 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3340
3341 link_drop(link);
3342 r = link_add(manager, m, &link);
3343 if (r < 0)
3344 return r;
3345 }
3346
3347 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3348 if (r >= 0 && mtu > 0) {
3349 link->mtu = mtu;
3350 if (link->original_mtu == 0) {
3351 link->original_mtu = mtu;
3352 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3353 }
3354
3355 if (link->dhcp_client) {
3356 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3357 link->mtu);
3358 if (r < 0)
3359 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3360 }
3361
3362 if (link->radv) {
3363 r = sd_radv_set_mtu(link->radv, link->mtu);
3364 if (r < 0)
3365 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3366 }
3367 }
3368
3369 /* The kernel may broadcast NEWLINK messages without the MAC address
3370 set, simply ignore them. */
3371 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3372 if (r >= 0) {
3373 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3374 ETH_ALEN)) {
3375
3376 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3377 ETH_ALEN);
3378
3379 log_link_debug(link, "MAC address: "
3380 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3381 mac.ether_addr_octet[0],
3382 mac.ether_addr_octet[1],
3383 mac.ether_addr_octet[2],
3384 mac.ether_addr_octet[3],
3385 mac.ether_addr_octet[4],
3386 mac.ether_addr_octet[5]);
3387
3388 if (link->ipv4ll) {
3389 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3390 if (r < 0)
3391 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3392 }
3393
3394 if (link->dhcp_client) {
3395 r = sd_dhcp_client_set_mac(link->dhcp_client,
3396 (const uint8_t *) &link->mac,
3397 sizeof (link->mac),
3398 ARPHRD_ETHER);
3399 if (r < 0)
3400 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3401
3402 r = dhcp4_set_client_identifier(link);
3403 if (r < 0)
3404 return r;
3405 }
3406
3407 if (link->dhcp6_client) {
3408 const DUID* duid = link_get_duid(link);
3409
3410 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3411 (const uint8_t *) &link->mac,
3412 sizeof (link->mac),
3413 ARPHRD_ETHER);
3414 if (r < 0)
3415 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3416
3417 if (link->network->iaid_set) {
3418 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3419 link->network->iaid);
3420 if (r < 0)
3421 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3422 }
3423
3424 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3425 duid->type,
3426 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3427 duid->raw_data_len);
3428 if (r < 0)
3429 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3430 }
3431
3432 if (link->radv) {
3433 r = sd_radv_set_mac(link->radv, &link->mac);
3434 if (r < 0)
3435 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3436 }
3437
3438 if (link->ndisc) {
3439 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3440 if (r < 0)
3441 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3442 }
3443 }
3444 }
3445
3446 old_master = link->master_ifindex;
3447 (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
3448
3449 had_carrier = link_has_carrier(link);
3450
3451 r = link_update_flags(link, m, old_master != link->master_ifindex);
3452 if (r < 0)
3453 return r;
3454
3455 r = link_update_lldp(link);
3456 if (r < 0)
3457 return r;
3458
3459 carrier_gained = !had_carrier && link_has_carrier(link);
3460 carrier_lost = had_carrier && !link_has_carrier(link);
3461
3462 if (carrier_gained) {
3463 log_link_info(link, "Gained carrier");
3464
3465 r = link_carrier_gained(link);
3466 if (r < 0)
3467 return r;
3468 } else if (carrier_lost) {
3469 log_link_info(link, "Lost carrier");
3470
3471 r = link_carrier_lost(link);
3472 if (r < 0)
3473 return r;
3474 }
3475
3476 return 0;
3477 }
3478
3479 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3480 bool space = false;
3481 Iterator i;
3482 Link *link;
3483
3484 assert(f);
3485 assert(prefix);
3486
3487 if (hashmap_isempty(h))
3488 return;
3489
3490 fputs(prefix, f);
3491 HASHMAP_FOREACH(link, h, i) {
3492 if (space)
3493 fputc(' ', f);
3494
3495 fprintf(f, "%i", link->ifindex);
3496 space = true;
3497 }
3498
3499 fputc('\n', f);
3500 }
3501
3502 int link_save(Link *link) {
3503 _cleanup_free_ char *temp_path = NULL;
3504 _cleanup_fclose_ FILE *f = NULL;
3505 const char *admin_state, *oper_state;
3506 Address *a;
3507 Route *route;
3508 Iterator i;
3509 int r;
3510
3511 assert(link);
3512 assert(link->state_file);
3513 assert(link->lease_file);
3514 assert(link->manager);
3515
3516 if (link->state == LINK_STATE_LINGER) {
3517 (void) unlink(link->state_file);
3518 return 0;
3519 }
3520
3521 link_lldp_save(link);
3522
3523 admin_state = link_state_to_string(link->state);
3524 assert(admin_state);
3525
3526 oper_state = link_operstate_to_string(link->operstate);
3527 assert(oper_state);
3528
3529 r = fopen_temporary(link->state_file, &f, &temp_path);
3530 if (r < 0)
3531 goto fail;
3532
3533 (void) fchmod(fileno(f), 0644);
3534
3535 fprintf(f,
3536 "# This is private data. Do not parse.\n"
3537 "ADMIN_STATE=%s\n"
3538 "OPER_STATE=%s\n",
3539 admin_state, oper_state);
3540
3541 if (link->network) {
3542 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
3543 const char *dhcp_domainname = NULL, *p;
3544 sd_dhcp6_lease *dhcp6_lease = NULL;
3545 unsigned j;
3546 bool space;
3547
3548 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3549 yes_no(link->network->required_for_online));
3550
3551 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
3552 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
3553
3554 if (link->dhcp6_client) {
3555 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3556 if (r < 0 && r != -ENOMSG)
3557 log_link_debug(link, "No DHCPv6 lease");
3558 }
3559
3560 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3561
3562 fputs("DNS=", f);
3563 space = false;
3564
3565 for (j = 0; j < link->network->n_dns; j++) {
3566 _cleanup_free_ char *b = NULL;
3567
3568 r = in_addr_to_string(link->network->dns[j].family,
3569 &link->network->dns[j].address, &b);
3570 if (r < 0) {
3571 log_debug_errno(r, "Failed to format address, ignoring: %m");
3572 continue;
3573 }
3574
3575 if (space)
3576 fputc(' ', f);
3577 fputs(b, f);
3578 space = true;
3579 }
3580
3581 if (link->network->dhcp_use_dns &&
3582 link->dhcp_lease) {
3583 const struct in_addr *addresses;
3584
3585 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3586 if (r > 0)
3587 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3588 space = true;
3589 }
3590
3591 if (link->network->dhcp_use_dns && dhcp6_lease) {
3592 struct in6_addr *in6_addrs;
3593
3594 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3595 if (r > 0) {
3596 if (space)
3597 fputc(' ', f);
3598 serialize_in6_addrs(f, in6_addrs, r);
3599 space = true;
3600 }
3601 }
3602
3603 /* Make sure to flush out old entries before we use the NDISC data */
3604 ndisc_vacuum(link);
3605
3606 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3607 NDiscRDNSS *dd;
3608
3609 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3610 if (space)
3611 fputc(' ', f);
3612
3613 serialize_in6_addrs(f, &dd->address, 1);
3614 space = true;
3615 }
3616 }
3617
3618 fputc('\n', f);
3619
3620 fputs("NTP=", f);
3621 space = false;
3622 fputstrv(f, link->network->ntp, NULL, &space);
3623
3624 if (link->network->dhcp_use_ntp &&
3625 link->dhcp_lease) {
3626 const struct in_addr *addresses;
3627
3628 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3629 if (r > 0)
3630 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3631 space = true;
3632 }
3633
3634 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3635 struct in6_addr *in6_addrs;
3636 char **hosts;
3637
3638 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3639 &in6_addrs);
3640 if (r > 0) {
3641 if (space)
3642 fputc(' ', f);
3643 serialize_in6_addrs(f, in6_addrs, r);
3644 space = true;
3645 }
3646
3647 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3648 if (r > 0)
3649 fputstrv(f, hosts, NULL, &space);
3650 }
3651
3652 fputc('\n', f);
3653
3654 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3655 if (link->dhcp_lease) {
3656 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3657 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3658 }
3659 if (dhcp6_lease)
3660 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3661 }
3662
3663 fputs("DOMAINS=", f);
3664 space = false;
3665 ORDERED_SET_FOREACH(p, link->network->search_domains, i)
3666 fputs_with_space(f, p, NULL, &space);
3667
3668 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3669 NDiscDNSSL *dd;
3670
3671 if (dhcp_domainname)
3672 fputs_with_space(f, dhcp_domainname, NULL, &space);
3673 if (dhcp_domains)
3674 fputstrv(f, dhcp_domains, NULL, &space);
3675 if (dhcp6_domains)
3676 fputstrv(f, dhcp6_domains, NULL, &space);
3677
3678 SET_FOREACH(dd, link->ndisc_dnssl, i)
3679 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3680 }
3681
3682 fputc('\n', f);
3683
3684 fputs("ROUTE_DOMAINS=", f);
3685 space = false;
3686 ORDERED_SET_FOREACH(p, link->network->route_domains, i)
3687 fputs_with_space(f, p, NULL, &space);
3688
3689 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3690 NDiscDNSSL *dd;
3691
3692 if (dhcp_domainname)
3693 fputs_with_space(f, dhcp_domainname, NULL, &space);
3694 if (dhcp_domains)
3695 fputstrv(f, dhcp_domains, NULL, &space);
3696 if (dhcp6_domains)
3697 fputstrv(f, dhcp6_domains, NULL, &space);
3698
3699 SET_FOREACH(dd, link->ndisc_dnssl, i)
3700 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3701 }
3702
3703 fputc('\n', f);
3704
3705 fprintf(f, "LLMNR=%s\n",
3706 resolve_support_to_string(link->network->llmnr));
3707 fprintf(f, "MDNS=%s\n",
3708 resolve_support_to_string(link->network->mdns));
3709 if (link->network->dns_default_route >= 0)
3710 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
3711
3712 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3713 fprintf(f, "DNS_OVER_TLS=%s\n",
3714 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
3715
3716 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3717 fprintf(f, "DNSSEC=%s\n",
3718 dnssec_mode_to_string(link->network->dnssec_mode));
3719
3720 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3721 const char *n;
3722
3723 fputs("DNSSEC_NTA=", f);
3724 space = false;
3725 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3726 fputs_with_space(f, n, NULL, &space);
3727 fputc('\n', f);
3728 }
3729
3730 fputs("ADDRESSES=", f);
3731 space = false;
3732 SET_FOREACH(a, link->addresses, i) {
3733 _cleanup_free_ char *address_str = NULL;
3734
3735 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3736 if (r < 0)
3737 goto fail;
3738
3739 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3740 space = true;
3741 }
3742 fputc('\n', f);
3743
3744 fputs("ROUTES=", f);
3745 space = false;
3746 SET_FOREACH(route, link->routes, i) {
3747 _cleanup_free_ char *route_str = NULL;
3748
3749 r = in_addr_to_string(route->family, &route->dst, &route_str);
3750 if (r < 0)
3751 goto fail;
3752
3753 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
3754 space ? " " : "", route_str,
3755 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3756 space = true;
3757 }
3758
3759 fputc('\n', f);
3760 }
3761
3762 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3763 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3764
3765 if (link->dhcp_lease) {
3766 struct in_addr address;
3767 const char *tz = NULL;
3768
3769 assert(link->network);
3770
3771 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3772 if (r >= 0)
3773 fprintf(f, "TIMEZONE=%s\n", tz);
3774
3775 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3776 if (r >= 0) {
3777 fputs("DHCP4_ADDRESS=", f);
3778 serialize_in_addrs(f, &address, 1, false, NULL);
3779 fputc('\n', f);
3780 }
3781
3782 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3783 if (r < 0)
3784 goto fail;
3785
3786 fprintf(f,
3787 "DHCP_LEASE=%s\n",
3788 link->lease_file);
3789 } else
3790 (void) unlink(link->lease_file);
3791
3792 if (link->ipv4ll) {
3793 struct in_addr address;
3794
3795 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3796 if (r >= 0) {
3797 fputs("IPV4LL_ADDRESS=", f);
3798 serialize_in_addrs(f, &address, 1, false, NULL);
3799 fputc('\n', f);
3800 }
3801 }
3802
3803 r = fflush_and_check(f);
3804 if (r < 0)
3805 goto fail;
3806
3807 if (rename(temp_path, link->state_file) < 0) {
3808 r = -errno;
3809 goto fail;
3810 }
3811
3812 return 0;
3813
3814 fail:
3815 (void) unlink(link->state_file);
3816 if (temp_path)
3817 (void) unlink(temp_path);
3818
3819 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3820 }
3821
3822 /* The serialized state in /run is no longer up-to-date. */
3823 void link_dirty(Link *link) {
3824 int r;
3825
3826 assert(link);
3827
3828 /* mark manager dirty as link is dirty */
3829 manager_dirty(link->manager);
3830
3831 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3832 if (r < 0)
3833 /* allocation errors are ignored */
3834 return;
3835
3836 r = set_put(link->manager->dirty_links, link);
3837 if (r <= 0)
3838 /* don't take another ref if the link was already dirty */
3839 return;
3840
3841 link_ref(link);
3842 }
3843
3844 /* The serialized state in /run is up-to-date */
3845 void link_clean(Link *link) {
3846 assert(link);
3847 assert(link->manager);
3848
3849 link_unref(set_remove(link->manager->dirty_links, link));
3850 }
3851
3852 static const char* const link_state_table[_LINK_STATE_MAX] = {
3853 [LINK_STATE_PENDING] = "pending",
3854 [LINK_STATE_INITIALIZED] = "initialized",
3855 [LINK_STATE_CONFIGURING] = "configuring",
3856 [LINK_STATE_CONFIGURED] = "configured",
3857 [LINK_STATE_UNMANAGED] = "unmanaged",
3858 [LINK_STATE_FAILED] = "failed",
3859 [LINK_STATE_LINGER] = "linger",
3860 };
3861
3862 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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