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networkd: Routes should take the gateway into account
[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 <linux/if_arp.h>
6 #include <unistd.h>
7
8 #include "alloc-util.h"
9 #include "bus-util.h"
10 #include "dhcp-identifier.h"
11 #include "dhcp-lease-internal.h"
12 #include "env-file.h"
13 #include "fd-util.h"
14 #include "fileio.h"
15 #include "missing_network.h"
16 #include "netdev/bond.h"
17 #include "netdev/bridge.h"
18 #include "netdev/ipvlan.h"
19 #include "netdev/vrf.h"
20 #include "netlink-util.h"
21 #include "network-internal.h"
22 #include "networkd-can.h"
23 #include "networkd-dhcp-server.h"
24 #include "networkd-dhcp4.h"
25 #include "networkd-dhcp6.h"
26 #include "networkd-ipv4ll.h"
27 #include "networkd-ipv6-proxy-ndp.h"
28 #include "networkd-link-bus.h"
29 #include "networkd-link.h"
30 #include "networkd-lldp-tx.h"
31 #include "networkd-manager.h"
32 #include "networkd-ndisc.h"
33 #include "networkd-neighbor.h"
34 #include "networkd-radv.h"
35 #include "networkd-routing-policy-rule.h"
36 #include "set.h"
37 #include "socket-util.h"
38 #include "stdio-util.h"
39 #include "string-table.h"
40 #include "strv.h"
41 #include "sysctl-util.h"
42 #include "tmpfile-util.h"
43 #include "udev-util.h"
44 #include "util.h"
45 #include "virt.h"
46
47 uint32_t link_get_vrf_table(Link *link) {
48 return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
49 }
50
51 uint32_t link_get_dhcp_route_table(Link *link) {
52 /* When the interface is part of an VRF use the VRFs routing table, unless
53 * another table is explicitly specified. */
54 if (link->network->dhcp_route_table_set)
55 return link->network->dhcp_route_table;
56 return link_get_vrf_table(link);
57 }
58
59 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
60 if (link->network->ipv6_accept_ra_route_table_set)
61 return link->network->ipv6_accept_ra_route_table;
62 return link_get_vrf_table(link);
63 }
64
65 DUID* link_get_duid(Link *link) {
66 if (link->network->duid.type != _DUID_TYPE_INVALID)
67 return &link->network->duid;
68 else
69 return &link->manager->duid;
70 }
71
72 int link_sysctl_ipv6_enabled(Link *link) {
73 _cleanup_free_ char *value = NULL;
74 int r;
75
76 assert(link);
77 assert(link->ifname);
78
79 if (link->sysctl_ipv6_enabled >= 0)
80 return link->sysctl_ipv6_enabled;
81
82 const char *ifname = link->ifname; /* work around bogus gcc warning */
83 r = sysctl_read_ip_property(AF_INET6, ifname, "disable_ipv6", &value);
84 if (r < 0)
85 return log_link_warning_errno(link, r,
86 "Failed to read net.ipv6.conf.%s.disable_ipv6 sysctl property: %m",
87 ifname);
88
89 link->sysctl_ipv6_enabled = value[0] == '0';
90 return link->sysctl_ipv6_enabled;
91 }
92
93 static bool link_dhcp6_enabled(Link *link) {
94 assert(link);
95
96 if (!socket_ipv6_is_supported())
97 return false;
98
99 if (link->flags & IFF_LOOPBACK)
100 return false;
101
102 if (!link->network)
103 return false;
104
105 if (link->network->bond)
106 return false;
107
108 if (link->iftype == ARPHRD_CAN)
109 return false;
110
111 if (link_sysctl_ipv6_enabled(link) == 0)
112 return false;
113
114 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
115 }
116
117 static bool link_dhcp4_enabled(Link *link) {
118 assert(link);
119
120 if (link->flags & IFF_LOOPBACK)
121 return false;
122
123 if (!link->network)
124 return false;
125
126 if (link->network->bond)
127 return false;
128
129 if (link->iftype == ARPHRD_CAN)
130 return false;
131
132 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
133 }
134
135 static bool link_dhcp4_server_enabled(Link *link) {
136 assert(link);
137
138 if (link->flags & IFF_LOOPBACK)
139 return false;
140
141 if (!link->network)
142 return false;
143
144 if (link->network->bond)
145 return false;
146
147 if (link->iftype == ARPHRD_CAN)
148 return false;
149
150 return link->network->dhcp_server;
151 }
152
153 bool link_ipv4ll_enabled(Link *link, AddressFamilyBoolean mask) {
154 assert(link);
155 assert((mask & ~(ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) == 0);
156
157 if (link->flags & IFF_LOOPBACK)
158 return false;
159
160 if (!link->network)
161 return false;
162
163 if (link->iftype == ARPHRD_CAN)
164 return false;
165
166 if (STRPTR_IN_SET(link->kind,
167 "vrf", "wireguard", "ipip", "gre", "ip6gre","ip6tnl", "sit", "vti",
168 "vti6", "nlmon", "xfrm"))
169 return false;
170
171 /* L3 or L3S mode do not support ARP. */
172 if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S))
173 return false;
174
175 if (link->network->bond)
176 return false;
177
178 return link->network->link_local & mask;
179 }
180
181 static bool link_ipv6ll_enabled(Link *link) {
182 assert(link);
183
184 if (!socket_ipv6_is_supported())
185 return false;
186
187 if (link->flags & IFF_LOOPBACK)
188 return false;
189
190 if (!link->network)
191 return false;
192
193 if (link->iftype == ARPHRD_CAN)
194 return false;
195
196 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "sit", "vti", "nlmon"))
197 return false;
198
199 if (link->network->bond)
200 return false;
201
202 if (link_sysctl_ipv6_enabled(link) == 0)
203 return false;
204
205 return link->network->link_local & ADDRESS_FAMILY_IPV6;
206 }
207
208 static bool link_ipv6_enabled(Link *link) {
209 assert(link);
210
211 if (!socket_ipv6_is_supported())
212 return false;
213
214 if (link->network->bond)
215 return false;
216
217 if (link_sysctl_ipv6_enabled(link) == 0)
218 return false;
219
220 if (link->iftype == ARPHRD_CAN)
221 return false;
222
223 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
224 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
225 }
226
227 static bool link_radv_enabled(Link *link) {
228 assert(link);
229
230 if (!link_ipv6ll_enabled(link))
231 return false;
232
233 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
234 }
235
236 static bool link_ipv4_forward_enabled(Link *link) {
237 assert(link);
238
239 if (link->flags & IFF_LOOPBACK)
240 return false;
241
242 if (!link->network)
243 return false;
244
245 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
246 return false;
247
248 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
249 }
250
251 static bool link_ipv6_forward_enabled(Link *link) {
252 assert(link);
253
254 if (!socket_ipv6_is_supported())
255 return false;
256
257 if (link->flags & IFF_LOOPBACK)
258 return false;
259
260 if (!link->network)
261 return false;
262
263 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
264 return false;
265
266 if (link_sysctl_ipv6_enabled(link) == 0)
267 return false;
268
269 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
270 }
271
272 static bool link_proxy_arp_enabled(Link *link) {
273 assert(link);
274
275 if (link->flags & IFF_LOOPBACK)
276 return false;
277
278 if (!link->network)
279 return false;
280
281 if (link->network->proxy_arp < 0)
282 return false;
283
284 return true;
285 }
286
287 static bool link_ipv6_accept_ra_enabled(Link *link) {
288 assert(link);
289
290 if (!socket_ipv6_is_supported())
291 return false;
292
293 if (link->flags & IFF_LOOPBACK)
294 return false;
295
296 if (!link->network)
297 return false;
298
299 if (!link_ipv6ll_enabled(link))
300 return false;
301
302 /* If unset use system default (enabled if local forwarding is disabled.
303 * disabled if local forwarding is enabled).
304 * If set, ignore or enforce RA independent of local forwarding state.
305 */
306 if (link->network->ipv6_accept_ra < 0)
307 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
308 return !link_ipv6_forward_enabled(link);
309 else if (link->network->ipv6_accept_ra > 0)
310 /* accept RA even if ip_forward is enabled */
311 return true;
312 else
313 /* ignore RA */
314 return false;
315 }
316
317 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
318 assert(link);
319
320 if (!socket_ipv6_is_supported())
321 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
322
323 if (link->flags & IFF_LOOPBACK)
324 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
325
326 if (!link->network)
327 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
328
329 return link->network->ipv6_privacy_extensions;
330 }
331
332 static int link_enable_ipv6(Link *link) {
333 bool disabled;
334 int r;
335
336 if (link->flags & IFF_LOOPBACK)
337 return 0;
338
339 disabled = !link_ipv6_enabled(link);
340
341 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", disabled);
342 if (r < 0)
343 log_link_warning_errno(link, r, "Cannot %s IPv6: %m", enable_disable(!disabled));
344 else
345 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
346
347 return 0;
348 }
349
350 static bool link_is_enslaved(Link *link) {
351 if (link->flags & IFF_SLAVE)
352 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
353 return true;
354
355 if (!link->network)
356 return false;
357
358 if (link->master_ifindex > 0 && link->network->bridge)
359 return true;
360
361 /* TODO: add conditions for other netdevs. */
362
363 return false;
364 }
365
366 static void link_update_master_operstate(Link *link, NetDev *netdev) {
367 Link *master;
368
369 if (!netdev)
370 return;
371
372 if (link_get(link->manager, netdev->ifindex, &master) < 0)
373 return;
374
375 link_update_operstate(master, true);
376 }
377
378 void link_update_operstate(Link *link, bool also_update_master) {
379 LinkOperationalState operstate;
380 LinkCarrierState carrier_state;
381 LinkAddressState address_state;
382 _cleanup_strv_free_ char **p = NULL;
383 uint8_t scope = RT_SCOPE_NOWHERE;
384 bool changed = false;
385 Address *address;
386 Iterator i;
387
388 assert(link);
389
390 if (link->kernel_operstate == IF_OPER_DORMANT)
391 carrier_state = LINK_CARRIER_STATE_DORMANT;
392 else if (link_has_carrier(link)) {
393 if (link_is_enslaved(link))
394 carrier_state = LINK_CARRIER_STATE_ENSLAVED;
395 else
396 carrier_state = LINK_CARRIER_STATE_CARRIER;
397 } else if (link->flags & IFF_UP)
398 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
399 else
400 carrier_state = LINK_CARRIER_STATE_OFF;
401
402 if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
403 Link *slave;
404
405 SET_FOREACH(slave, link->slaves, i) {
406 link_update_operstate(slave, false);
407
408 if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
409 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
410 }
411 }
412
413 SET_FOREACH(address, link->addresses, i) {
414 if (!address_is_ready(address))
415 continue;
416
417 if (address->scope < scope)
418 scope = address->scope;
419 }
420
421 /* for operstate we also take foreign addresses into account */
422 SET_FOREACH(address, link->addresses_foreign, i) {
423 if (!address_is_ready(address))
424 continue;
425
426 if (address->scope < scope)
427 scope = address->scope;
428 }
429
430 if (scope < RT_SCOPE_SITE)
431 /* universally accessible addresses found */
432 address_state = LINK_ADDRESS_STATE_ROUTABLE;
433 else if (scope < RT_SCOPE_HOST)
434 /* only link or site local addresses found */
435 address_state = LINK_ADDRESS_STATE_DEGRADED;
436 else
437 /* no useful addresses found */
438 address_state = LINK_ADDRESS_STATE_OFF;
439
440 /* Mapping of address and carrier state vs operational state
441 * carrier state
442 * | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
443 * ------------------------------------------------------------------------------
444 * off | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
445 * address_state degraded | off | no-carrier | dormant | degraded-carrier | degraded | enslaved
446 * routable | off | no-carrier | dormant | degraded-carrier | routable | routable
447 */
448
449 if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
450 operstate = (LinkOperationalState) carrier_state;
451 else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
452 operstate = LINK_OPERSTATE_ROUTABLE;
453 else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
454 operstate = LINK_OPERSTATE_DEGRADED;
455 else
456 operstate = LINK_OPERSTATE_ENSLAVED;
457
458 if (link->carrier_state != carrier_state) {
459 link->carrier_state = carrier_state;
460 changed = true;
461 if (strv_extend(&p, "CarrierState") < 0)
462 log_oom();
463 }
464
465 if (link->address_state != address_state) {
466 link->address_state = address_state;
467 changed = true;
468 if (strv_extend(&p, "AddressState") < 0)
469 log_oom();
470 }
471
472 if (link->operstate != operstate) {
473 link->operstate = operstate;
474 changed = true;
475 if (strv_extend(&p, "OperationalState") < 0)
476 log_oom();
477 }
478
479 if (p)
480 link_send_changed_strv(link, p);
481 if (changed)
482 link_dirty(link);
483
484 if (also_update_master && link->network) {
485 link_update_master_operstate(link, link->network->bond);
486 link_update_master_operstate(link, link->network->bridge);
487 }
488 }
489
490 #define FLAG_STRING(string, flag, old, new) \
491 (((old ^ new) & flag) \
492 ? ((old & flag) ? (" -" string) : (" +" string)) \
493 : "")
494
495 static int link_update_flags(Link *link, sd_netlink_message *m, bool force_update_operstate) {
496 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
497 uint8_t operstate;
498 int r;
499
500 assert(link);
501
502 r = sd_rtnl_message_link_get_flags(m, &flags);
503 if (r < 0)
504 return log_link_warning_errno(link, r, "Could not get link flags: %m");
505
506 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
507 if (r < 0)
508 /* if we got a message without operstate, take it to mean
509 the state was unchanged */
510 operstate = link->kernel_operstate;
511
512 if (!force_update_operstate && (link->flags == flags) && (link->kernel_operstate == operstate))
513 return 0;
514
515 if (link->flags != flags) {
516 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",
517 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
518 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
519 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
520 FLAG_STRING("UP", IFF_UP, link->flags, flags),
521 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
522 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
523 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
524 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
525 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
526 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
527 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
528 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
529 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
530 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
531 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
532 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
533 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
534 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
535 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
536
537 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
538 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
539 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
540 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
541 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
542 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
543 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
544 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
545
546 /* link flags are currently at most 18 bits, let's align to
547 * printing 20 */
548 if (unknown_flags_added)
549 log_link_debug(link,
550 "Unknown link flags gained: %#.5x (ignoring)",
551 unknown_flags_added);
552
553 if (unknown_flags_removed)
554 log_link_debug(link,
555 "Unknown link flags lost: %#.5x (ignoring)",
556 unknown_flags_removed);
557 }
558
559 link->flags = flags;
560 link->kernel_operstate = operstate;
561
562 link_update_operstate(link, true);
563
564 return 0;
565 }
566
567 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
568 _cleanup_(link_unrefp) Link *link = NULL;
569 uint16_t type;
570 const char *ifname, *kind = NULL;
571 int r, ifindex;
572 unsigned short iftype;
573
574 assert(manager);
575 assert(message);
576 assert(ret);
577
578 /* check for link kind */
579 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
580 if (r == 0) {
581 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
582 r = sd_netlink_message_exit_container(message);
583 if (r < 0)
584 return r;
585 }
586
587 r = sd_netlink_message_get_type(message, &type);
588 if (r < 0)
589 return r;
590 else if (type != RTM_NEWLINK)
591 return -EINVAL;
592
593 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
594 if (r < 0)
595 return r;
596 else if (ifindex <= 0)
597 return -EINVAL;
598
599 r = sd_rtnl_message_link_get_type(message, &iftype);
600 if (r < 0)
601 return r;
602
603 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
604 if (r < 0)
605 return r;
606
607 link = new(Link, 1);
608 if (!link)
609 return -ENOMEM;
610
611 *link = (Link) {
612 .n_ref = 1,
613 .manager = manager,
614 .state = LINK_STATE_PENDING,
615 .ifindex = ifindex,
616 .iftype = iftype,
617 .sysctl_ipv6_enabled = -1,
618
619 .n_dns = (unsigned) -1,
620 .dns_default_route = -1,
621 .llmnr = _RESOLVE_SUPPORT_INVALID,
622 .mdns = _RESOLVE_SUPPORT_INVALID,
623 .dnssec_mode = _DNSSEC_MODE_INVALID,
624 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
625 };
626
627 link->ifname = strdup(ifname);
628 if (!link->ifname)
629 return -ENOMEM;
630
631 if (kind) {
632 link->kind = strdup(kind);
633 if (!link->kind)
634 return -ENOMEM;
635 }
636
637 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
638 if (r < 0)
639 log_link_debug_errno(link, r, "New device has no master, continuing without");
640
641 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
642 if (r < 0)
643 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
644
645 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
646 return -ENOMEM;
647
648 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
649 return -ENOMEM;
650
651 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
652 return -ENOMEM;
653
654 r = hashmap_ensure_allocated(&manager->links, NULL);
655 if (r < 0)
656 return r;
657
658 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
659 if (r < 0)
660 return r;
661
662 r = link_update_flags(link, message, false);
663 if (r < 0)
664 return r;
665
666 *ret = TAKE_PTR(link);
667
668 return 0;
669 }
670
671 void link_ntp_settings_clear(Link *link) {
672 link->ntp = strv_free(link->ntp);
673 }
674
675 void link_dns_settings_clear(Link *link) {
676 link->dns = mfree(link->dns);
677 link->n_dns = (unsigned) -1;
678
679 link->search_domains = ordered_set_free_free(link->search_domains);
680 link->route_domains = ordered_set_free_free(link->route_domains);
681
682 link->dns_default_route = -1;
683 link->llmnr = _RESOLVE_SUPPORT_INVALID;
684 link->mdns = _RESOLVE_SUPPORT_INVALID;
685 link->dnssec_mode = _DNSSEC_MODE_INVALID;
686 link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
687
688 link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
689 }
690
691 static Link *link_free(Link *link) {
692 Address *address;
693
694 assert(link);
695
696 link_ntp_settings_clear(link);
697 link_dns_settings_clear(link);
698
699 link->routes = set_free_with_destructor(link->routes, route_free);
700 link->routes_foreign = set_free_with_destructor(link->routes_foreign, route_free);
701
702 link->addresses = set_free_with_destructor(link->addresses, address_free);
703 link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free);
704
705 while ((address = link->pool_addresses)) {
706 LIST_REMOVE(addresses, link->pool_addresses, address);
707 address_free(address);
708 }
709
710 sd_dhcp_server_unref(link->dhcp_server);
711 sd_dhcp_client_unref(link->dhcp_client);
712 sd_dhcp_lease_unref(link->dhcp_lease);
713 set_free(link->dhcp_routes);
714
715 link_lldp_emit_stop(link);
716
717 free(link->lease_file);
718
719 sd_lldp_unref(link->lldp);
720 free(link->lldp_file);
721
722 ndisc_flush(link);
723
724 sd_ipv4ll_unref(link->ipv4ll);
725 sd_dhcp6_client_unref(link->dhcp6_client);
726 sd_ndisc_unref(link->ndisc);
727 sd_radv_unref(link->radv);
728
729 free(link->ifname);
730 free(link->kind);
731
732 (void) unlink(link->state_file);
733 free(link->state_file);
734
735 sd_device_unref(link->sd_device);
736
737 hashmap_free(link->bound_to_links);
738 hashmap_free(link->bound_by_links);
739
740 set_free_with_destructor(link->slaves, link_unref);
741
742 network_unref(link->network);
743
744 return mfree(link);
745 }
746
747 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
748
749 int link_get(Manager *m, int ifindex, Link **ret) {
750 Link *link;
751
752 assert(m);
753 assert(ifindex);
754 assert(ret);
755
756 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
757 if (!link)
758 return -ENODEV;
759
760 *ret = link;
761
762 return 0;
763 }
764
765 void link_set_state(Link *link, LinkState state) {
766 assert(link);
767
768 if (link->state == state)
769 return;
770
771 log_link_debug(link, "State changed: %s -> %s",
772 link_state_to_string(link->state),
773 link_state_to_string(state));
774
775 link->state = state;
776
777 link_send_changed(link, "AdministrativeState", NULL);
778 }
779
780 static void link_enter_unmanaged(Link *link) {
781 assert(link);
782
783 link_set_state(link, LINK_STATE_UNMANAGED);
784
785 link_dirty(link);
786 }
787
788 int link_stop_clients(Link *link, bool may_keep_dhcp) {
789 int r = 0, k;
790
791 assert(link);
792 assert(link->manager);
793 assert(link->manager->event);
794
795 dhcp4_release_old_lease(link);
796
797 if (link->dhcp_client && (!may_keep_dhcp || !link->network ||
798 !FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP))) {
799 k = sd_dhcp_client_stop(link->dhcp_client);
800 if (k < 0)
801 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
802 }
803
804 if (link->ipv4ll) {
805 k = sd_ipv4ll_stop(link->ipv4ll);
806 if (k < 0)
807 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
808 }
809
810 if (link->dhcp6_client) {
811 k = sd_dhcp6_client_stop(link->dhcp6_client);
812 if (k < 0)
813 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
814 }
815
816 if (link->ndisc) {
817 k = sd_ndisc_stop(link->ndisc);
818 if (k < 0)
819 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
820 }
821
822 if (link->radv) {
823 k = sd_radv_stop(link->radv);
824 if (k < 0)
825 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
826 }
827
828 link_lldp_emit_stop(link);
829 return r;
830 }
831
832 void link_enter_failed(Link *link) {
833 assert(link);
834
835 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
836 return;
837
838 log_link_warning(link, "Failed");
839
840 link_set_state(link, LINK_STATE_FAILED);
841
842 link_stop_clients(link, false);
843
844 link_dirty(link);
845 }
846
847 static int link_join_netdevs_after_configured(Link *link) {
848 NetDev *netdev;
849 Iterator i;
850 int r;
851
852 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
853 if (netdev->ifindex > 0)
854 /* Assume already enslaved. */
855 continue;
856
857 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
858 continue;
859
860 log_struct(LOG_DEBUG,
861 LOG_LINK_INTERFACE(link),
862 LOG_NETDEV_INTERFACE(netdev),
863 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
864
865 r = netdev_join(netdev, link, NULL);
866 if (r < 0)
867 return log_struct_errno(LOG_WARNING, r,
868 LOG_LINK_INTERFACE(link),
869 LOG_NETDEV_INTERFACE(netdev),
870 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
871 }
872
873 return 0;
874 }
875
876 static void link_enter_configured(Link *link) {
877 assert(link);
878 assert(link->network);
879
880 if (link->state != LINK_STATE_CONFIGURING)
881 return;
882
883 log_link_info(link, "Configured");
884
885 link_set_state(link, LINK_STATE_CONFIGURED);
886
887 (void) link_join_netdevs_after_configured(link);
888
889 link_dirty(link);
890 }
891
892 static int link_request_set_routing_policy_rule(Link *link) {
893 RoutingPolicyRule *rule, *rrule = NULL;
894 int r;
895
896 assert(link);
897 assert(link->network);
898
899 link->routing_policy_rules_configured = false;
900
901 LIST_FOREACH(rules, rule, link->network->rules) {
902 r = routing_policy_rule_get(link->manager, rule, &rrule);
903 if (r >= 0) {
904 if (r == 0)
905 (void) routing_policy_rule_make_local(link->manager, rrule);
906 continue;
907 }
908
909 r = routing_policy_rule_configure(rule, link, NULL);
910 if (r < 0)
911 return log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
912 if (r > 0)
913 link->routing_policy_rule_messages++;
914 }
915
916 routing_policy_rule_purge(link->manager, link);
917 if (link->routing_policy_rule_messages == 0) {
918 link->routing_policy_rules_configured = true;
919 link_check_ready(link);
920 } else {
921 log_link_debug(link, "Setting routing policy rules");
922 link_set_state(link, LINK_STATE_CONFIGURING);
923 }
924
925 return 0;
926 }
927
928 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
929 int r;
930
931 assert(link);
932 assert(link->route_messages > 0);
933 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
934 LINK_STATE_FAILED, LINK_STATE_LINGER));
935
936 link->route_messages--;
937
938 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
939 return 1;
940
941 r = sd_netlink_message_get_errno(m);
942 if (r < 0 && r != -EEXIST) {
943 log_link_warning_errno(link, r, "Could not set route: %m");
944 link_enter_failed(link);
945 return 1;
946 }
947
948 if (link->route_messages == 0) {
949 log_link_debug(link, "Routes set");
950 link->static_routes_configured = true;
951 link_check_ready(link);
952 }
953
954 return 1;
955 }
956
957 int link_request_set_routes(Link *link) {
958 enum {
959 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
960 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
961 _PHASE_MAX
962 } phase;
963 Route *rt;
964 int r;
965
966 assert(link);
967 assert(link->network);
968 assert(link->addresses_configured);
969 assert(link->address_messages == 0);
970 assert(link->state != _LINK_STATE_INVALID);
971
972 link->static_routes_configured = false;
973
974 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
975 /* During configuring addresses, the link lost its carrier. As networkd is dropping
976 * the addresses now, let's not configure the routes either. */
977 return 0;
978
979 r = link_request_set_routing_policy_rule(link);
980 if (r < 0)
981 return r;
982
983 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
984 for (phase = 0; phase < _PHASE_MAX; phase++)
985 LIST_FOREACH(routes, rt, link->network->static_routes) {
986
987 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
988 continue;
989
990 r = route_configure(rt, link, route_handler);
991 if (r < 0)
992 return log_link_warning_errno(link, r, "Could not set routes: %m");
993 if (r > 0)
994 link->route_messages++;
995 }
996
997 if (link->route_messages == 0) {
998 link->static_routes_configured = true;
999 link_check_ready(link);
1000 } else {
1001 log_link_debug(link, "Setting routes");
1002 link_set_state(link, LINK_STATE_CONFIGURING);
1003 }
1004
1005 return 0;
1006 }
1007
1008 void link_check_ready(Link *link) {
1009 Address *a;
1010 Iterator i;
1011 int r;
1012
1013 assert(link);
1014
1015 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1016 return;
1017
1018 if (!link->network)
1019 return;
1020
1021 if (!link->addresses_configured)
1022 return;
1023
1024 if (!link->neighbors_configured)
1025 return;
1026
1027 SET_FOREACH(a, link->addresses, i)
1028 if (!address_is_ready(a))
1029 return;
1030
1031 if (!link->addresses_ready) {
1032 link->addresses_ready = true;
1033 r = link_request_set_routes(link);
1034 if (r < 0)
1035 link_enter_failed(link);
1036 return;
1037 }
1038
1039 if (!link->static_routes_configured)
1040 return;
1041
1042 if (!link->routing_policy_rules_configured)
1043 return;
1044
1045 if (link_has_carrier(link) || !link->network->configure_without_carrier) {
1046
1047 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !(link->ipv4ll_address && link->ipv4ll_route))
1048 return;
1049
1050 if (link_ipv6ll_enabled(link) &&
1051 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
1052 return;
1053
1054 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
1055 !link->dhcp4_configured &&
1056 !link->dhcp6_configured &&
1057 !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address && link->ipv4ll_route))
1058 /* When DHCP is enabled, at least one protocol must provide an address, or
1059 * an IPv4ll fallback address must be configured. */
1060 return;
1061
1062 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
1063 return;
1064 }
1065
1066 if (link->state != LINK_STATE_CONFIGURED)
1067 link_enter_configured(link);
1068
1069 return;
1070 }
1071
1072 static int link_request_set_neighbors(Link *link) {
1073 Neighbor *neighbor;
1074 int r;
1075
1076 assert(link);
1077 assert(link->network);
1078 assert(link->state != _LINK_STATE_INVALID);
1079
1080 link->neighbors_configured = false;
1081
1082 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1083 r = neighbor_configure(neighbor, link, NULL);
1084 if (r < 0)
1085 return log_link_warning_errno(link, r, "Could not set neighbor: %m");
1086 }
1087
1088 if (link->neighbor_messages == 0) {
1089 link->neighbors_configured = true;
1090 link_check_ready(link);
1091 } else {
1092 log_link_debug(link, "Setting neighbors");
1093 link_set_state(link, LINK_STATE_CONFIGURING);
1094 }
1095
1096 return 0;
1097 }
1098
1099 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1100 int r;
1101
1102 assert(rtnl);
1103 assert(m);
1104 assert(link);
1105 assert(link->ifname);
1106 assert(link->address_messages > 0);
1107 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1108 LINK_STATE_FAILED, LINK_STATE_LINGER));
1109
1110 link->address_messages--;
1111
1112 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1113 return 1;
1114
1115 r = sd_netlink_message_get_errno(m);
1116 if (r < 0 && r != -EEXIST) {
1117 log_link_warning_errno(link, r, "could not set address: %m");
1118 link_enter_failed(link);
1119 return 1;
1120 } else if (r >= 0)
1121 (void) manager_rtnl_process_address(rtnl, m, link->manager);
1122
1123 if (link->address_messages == 0) {
1124 log_link_debug(link, "Addresses set");
1125 link->addresses_configured = true;
1126 link_check_ready(link);
1127 }
1128
1129 return 1;
1130 }
1131
1132 static int link_set_bridge_fdb(Link *link) {
1133 FdbEntry *fdb_entry;
1134 int r;
1135
1136 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1137 r = fdb_entry_configure(link, fdb_entry);
1138 if (r < 0)
1139 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1140 }
1141
1142 return 0;
1143 }
1144
1145 static int link_request_set_addresses(Link *link) {
1146 AddressLabel *label;
1147 Address *ad;
1148 int r;
1149
1150 assert(link);
1151 assert(link->network);
1152 assert(link->state != _LINK_STATE_INVALID);
1153
1154 /* Reset all *_configured flags we are configuring. */
1155 link->addresses_configured = false;
1156 link->addresses_ready = false;
1157 link->neighbors_configured = false;
1158 link->static_routes_configured = false;
1159 link->routing_policy_rules_configured = false;
1160
1161 r = link_set_bridge_fdb(link);
1162 if (r < 0)
1163 return r;
1164
1165 r = link_request_set_neighbors(link);
1166 if (r < 0)
1167 return r;
1168
1169 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1170 bool update;
1171
1172 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1173
1174 r = address_configure(ad, link, address_handler, update);
1175 if (r < 0)
1176 return log_link_warning_errno(link, r, "Could not set addresses: %m");
1177 if (r > 0)
1178 link->address_messages++;
1179 }
1180
1181 LIST_FOREACH(labels, label, link->network->address_labels) {
1182 r = address_label_configure(label, link, NULL, false);
1183 if (r < 0)
1184 return log_link_warning_errno(link, r, "Could not set address label: %m");
1185
1186 link->address_label_messages++;
1187 }
1188
1189 /* now that we can figure out a default address for the dhcp server,
1190 start it */
1191 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1192 r = dhcp4_server_configure(link);
1193 if (r < 0)
1194 return r;
1195 log_link_debug(link, "Offering DHCPv4 leases");
1196 }
1197
1198 if (link->address_messages == 0) {
1199 link->addresses_configured = true;
1200 link_check_ready(link);
1201 } else {
1202 log_link_debug(link, "Setting addresses");
1203 link_set_state(link, LINK_STATE_CONFIGURING);
1204 }
1205
1206 return 0;
1207 }
1208
1209 static int link_set_bridge_vlan(Link *link) {
1210 int r;
1211
1212 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1213 if (r < 0)
1214 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1215
1216 return r;
1217 }
1218
1219 static int link_set_proxy_arp(Link *link) {
1220 int r;
1221
1222 if (!link_proxy_arp_enabled(link))
1223 return 0;
1224
1225 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1226 if (r < 0)
1227 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1228
1229 return 0;
1230 }
1231
1232 static int link_configure_after_setting_mtu(Link *link);
1233
1234 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1235 int r;
1236
1237 assert(m);
1238 assert(link);
1239 assert(link->ifname);
1240
1241 link->setting_mtu = false;
1242
1243 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1244 return 1;
1245
1246 r = sd_netlink_message_get_errno(m);
1247 if (r < 0)
1248 log_link_warning_errno(link, r, "Could not set MTU, ignoring: %m");
1249 else
1250 log_link_debug(link, "Setting MTU done.");
1251
1252 if (link->state == LINK_STATE_INITIALIZED) {
1253 r = link_configure_after_setting_mtu(link);
1254 if (r < 0)
1255 link_enter_failed(link);
1256 }
1257
1258 return 1;
1259 }
1260
1261 int link_set_mtu(Link *link, uint32_t mtu) {
1262 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1263 int r;
1264
1265 assert(link);
1266 assert(link->manager);
1267 assert(link->manager->rtnl);
1268
1269 if (mtu == 0 || link->setting_mtu)
1270 return 0;
1271
1272 if (link->mtu == mtu)
1273 return 0;
1274
1275 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1276
1277 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1278 if (r < 0)
1279 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1280
1281 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1282 * for this interface, then disable IPv6 else enable it. */
1283 (void) link_enable_ipv6(link);
1284
1285 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1286 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1287 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1288
1289 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1290 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1291
1292 mtu = IPV6_MIN_MTU;
1293 }
1294
1295 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1296 if (r < 0)
1297 return log_link_error_errno(link, r, "Could not append MTU: %m");
1298
1299 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1300 link_netlink_destroy_callback, link);
1301 if (r < 0)
1302 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1303
1304 link_ref(link);
1305 link->setting_mtu = true;
1306
1307 return 0;
1308 }
1309
1310 static bool link_reduces_vlan_mtu(Link *link) {
1311 /* See netif_reduces_vlan_mtu() in kernel. */
1312 return streq_ptr(link->kind, "macsec");
1313 }
1314
1315 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1316 uint32_t mtu = 0;
1317 NetDev *dev;
1318 Iterator i;
1319
1320 HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1321 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1322 /* See vlan_dev_change_mtu() in kernel. */
1323 mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1324
1325 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1326 /* See macvlan_change_mtu() in kernel. */
1327 mtu = dev->mtu;
1328
1329 return mtu;
1330 }
1331
1332 static int link_configure_mtu(Link *link) {
1333 uint32_t mtu;
1334
1335 assert(link);
1336 assert(link->network);
1337
1338 if (link->network->mtu > 0)
1339 return link_set_mtu(link, link->network->mtu);
1340
1341 mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1342 if (link->mtu >= mtu)
1343 return 0;
1344
1345 log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1346 "If it is not desired, then please explicitly specify MTUBytes= setting.",
1347 link->mtu, mtu);
1348
1349 return link_set_mtu(link, mtu);
1350 }
1351
1352 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1353 int r;
1354
1355 assert(m);
1356 assert(link);
1357 assert(link->ifname);
1358
1359 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1360 return 1;
1361
1362 r = sd_netlink_message_get_errno(m);
1363 if (r < 0)
1364 log_link_warning_errno(link, r, "Could not set link flags, ignoring: %m");
1365
1366 return 1;
1367 }
1368
1369 static int link_set_flags(Link *link) {
1370 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1371 unsigned ifi_change = 0;
1372 unsigned ifi_flags = 0;
1373 int r;
1374
1375 assert(link);
1376 assert(link->manager);
1377 assert(link->manager->rtnl);
1378
1379 if (link->flags & IFF_LOOPBACK)
1380 return 0;
1381
1382 if (!link->network)
1383 return 0;
1384
1385 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1386 return 0;
1387
1388 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1389 if (r < 0)
1390 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1391
1392 if (link->network->arp >= 0) {
1393 ifi_change |= IFF_NOARP;
1394 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1395 }
1396
1397 if (link->network->multicast >= 0) {
1398 ifi_change |= IFF_MULTICAST;
1399 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1400 }
1401
1402 if (link->network->allmulticast >= 0) {
1403 ifi_change |= IFF_ALLMULTI;
1404 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1405 }
1406
1407 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1408 if (r < 0)
1409 return log_link_error_errno(link, r, "Could not set link flags: %m");
1410
1411 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1412 link_netlink_destroy_callback, link);
1413 if (r < 0)
1414 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1415
1416 link_ref(link);
1417
1418 return 0;
1419 }
1420
1421 static int link_acquire_ipv6_conf(Link *link) {
1422 int r;
1423
1424 assert(link);
1425
1426 if (link_ipv6_accept_ra_enabled(link)) {
1427 assert(link->ndisc);
1428
1429 log_link_debug(link, "Discovering IPv6 routers");
1430
1431 r = sd_ndisc_start(link->ndisc);
1432 if (r < 0 && r != -EBUSY)
1433 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1434 }
1435
1436 if (link_radv_enabled(link)) {
1437 assert(link->radv);
1438 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1439
1440 log_link_debug(link, "Starting IPv6 Router Advertisements");
1441
1442 r = sd_radv_start(link->radv);
1443 if (r < 0 && r != -EBUSY)
1444 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1445 }
1446
1447 (void) dhcp6_request_prefix_delegation(link);
1448
1449 return 0;
1450 }
1451
1452 static int link_acquire_ipv4_conf(Link *link) {
1453 int r;
1454
1455 assert(link);
1456 assert(link->manager);
1457 assert(link->manager->event);
1458
1459 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1460 assert(link->ipv4ll);
1461
1462 log_link_debug(link, "Acquiring IPv4 link-local address");
1463
1464 r = sd_ipv4ll_start(link->ipv4ll);
1465 if (r < 0)
1466 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1467 }
1468
1469 if (link_dhcp4_enabled(link)) {
1470 assert(link->dhcp_client);
1471
1472 log_link_debug(link, "Acquiring DHCPv4 lease");
1473
1474 r = sd_dhcp_client_start(link->dhcp_client);
1475 if (r < 0)
1476 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1477 }
1478
1479 return 0;
1480 }
1481
1482 static int link_acquire_conf(Link *link) {
1483 int r;
1484
1485 assert(link);
1486
1487 r = link_acquire_ipv4_conf(link);
1488 if (r < 0)
1489 return r;
1490
1491 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1492 r = link_acquire_ipv6_conf(link);
1493 if (r < 0)
1494 return r;
1495 }
1496
1497 if (link_lldp_emit_enabled(link)) {
1498 r = link_lldp_emit_start(link);
1499 if (r < 0)
1500 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1501 }
1502
1503 return 0;
1504 }
1505
1506 bool link_has_carrier(Link *link) {
1507 /* see Documentation/networking/operstates.txt in the kernel sources */
1508
1509 if (link->kernel_operstate == IF_OPER_UP)
1510 return true;
1511
1512 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1513 /* operstate may not be implemented, so fall back to flags */
1514 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1515 !FLAGS_SET(link->flags, IFF_DORMANT))
1516 return true;
1517
1518 return false;
1519 }
1520
1521 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1522 int r;
1523
1524 assert(link);
1525
1526 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1527 return 1;
1528
1529 r = sd_netlink_message_get_errno(m);
1530 if (r < 0)
1531 log_link_warning_errno(link, r, "Could not set address genmode for interface, ignoring: %m");
1532
1533 return 1;
1534 }
1535
1536 static int link_configure_addrgen_mode(Link *link) {
1537 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1538 uint8_t ipv6ll_mode;
1539 int r;
1540
1541 assert(link);
1542 assert(link->network);
1543 assert(link->manager);
1544 assert(link->manager->rtnl);
1545
1546 if (!socket_ipv6_is_supported())
1547 return 0;
1548
1549 log_link_debug(link, "Setting address genmode for link");
1550
1551 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1552 if (r < 0)
1553 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1554
1555 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1556 if (r < 0)
1557 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1558
1559 r = sd_netlink_message_open_container(req, AF_INET6);
1560 if (r < 0)
1561 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1562
1563 if (!link_ipv6ll_enabled(link))
1564 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1565 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1566 /* The file may not exist. And event if it exists, when stable_secret is unset,
1567 * reading the file fails with EIO. */
1568 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1569 else
1570 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1571
1572 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1573 if (r < 0)
1574 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1575
1576 r = sd_netlink_message_close_container(req);
1577 if (r < 0)
1578 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1579
1580 r = sd_netlink_message_close_container(req);
1581 if (r < 0)
1582 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1583
1584 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1585 link_netlink_destroy_callback, link);
1586 if (r < 0)
1587 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1588
1589 link_ref(link);
1590
1591 return 0;
1592 }
1593
1594 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1595 int r;
1596
1597 assert(link);
1598
1599 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1600 return 1;
1601
1602 r = sd_netlink_message_get_errno(m);
1603 if (r < 0)
1604 /* we warn but don't fail the link, as it may be brought up later */
1605 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1606
1607 return 1;
1608 }
1609
1610 static int link_up(Link *link) {
1611 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1612 int r;
1613
1614 assert(link);
1615 assert(link->network);
1616 assert(link->manager);
1617 assert(link->manager->rtnl);
1618
1619 log_link_debug(link, "Bringing link up");
1620
1621 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1622 if (r < 0)
1623 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1624
1625 /* set it free if not enslaved with networkd */
1626 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1627 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1628 if (r < 0)
1629 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1630 }
1631
1632 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1633 if (r < 0)
1634 return log_link_error_errno(link, r, "Could not set link flags: %m");
1635
1636 if (link->network->mac) {
1637 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1638 if (r < 0)
1639 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1640 }
1641
1642 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1643 link_netlink_destroy_callback, link);
1644 if (r < 0)
1645 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1646
1647 link_ref(link);
1648
1649 return 0;
1650 }
1651
1652 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1653 int r;
1654
1655 assert(link);
1656
1657 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1658 return 1;
1659
1660 r = sd_netlink_message_get_errno(m);
1661 if (r < 0)
1662 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1663
1664 return 1;
1665 }
1666
1667 int link_down(Link *link, link_netlink_message_handler_t callback) {
1668 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1669 int r;
1670
1671 assert(link);
1672 assert(link->manager);
1673 assert(link->manager->rtnl);
1674
1675 log_link_debug(link, "Bringing link down");
1676
1677 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1678 RTM_SETLINK, link->ifindex);
1679 if (r < 0)
1680 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1681
1682 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1683 if (r < 0)
1684 return log_link_error_errno(link, r, "Could not set link flags: %m");
1685
1686 r = netlink_call_async(link->manager->rtnl, NULL, req,
1687 callback ?: link_down_handler,
1688 link_netlink_destroy_callback, link);
1689 if (r < 0)
1690 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1691
1692 link_ref(link);
1693
1694 return 0;
1695 }
1696
1697 static int link_handle_bound_to_list(Link *link) {
1698 Link *l;
1699 Iterator i;
1700 int r;
1701 bool required_up = false;
1702 bool link_is_up = false;
1703
1704 assert(link);
1705
1706 if (hashmap_isempty(link->bound_to_links))
1707 return 0;
1708
1709 if (link->flags & IFF_UP)
1710 link_is_up = true;
1711
1712 HASHMAP_FOREACH (l, link->bound_to_links, i)
1713 if (link_has_carrier(l)) {
1714 required_up = true;
1715 break;
1716 }
1717
1718 if (!required_up && link_is_up) {
1719 r = link_down(link, NULL);
1720 if (r < 0)
1721 return r;
1722 } else if (required_up && !link_is_up) {
1723 r = link_up(link);
1724 if (r < 0)
1725 return r;
1726 }
1727
1728 return 0;
1729 }
1730
1731 static int link_handle_bound_by_list(Link *link) {
1732 Iterator i;
1733 Link *l;
1734 int r;
1735
1736 assert(link);
1737
1738 if (hashmap_isempty(link->bound_by_links))
1739 return 0;
1740
1741 HASHMAP_FOREACH (l, link->bound_by_links, i) {
1742 r = link_handle_bound_to_list(l);
1743 if (r < 0)
1744 return r;
1745 }
1746
1747 return 0;
1748 }
1749
1750 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1751 int r;
1752
1753 assert(link);
1754 assert(carrier);
1755
1756 if (link == carrier)
1757 return 0;
1758
1759 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1760 return 0;
1761
1762 r = hashmap_ensure_allocated(h, NULL);
1763 if (r < 0)
1764 return r;
1765
1766 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1767 if (r < 0)
1768 return r;
1769
1770 return 0;
1771 }
1772
1773 static int link_new_bound_by_list(Link *link) {
1774 Manager *m;
1775 Link *carrier;
1776 Iterator i;
1777 int r;
1778 bool list_updated = false;
1779
1780 assert(link);
1781 assert(link->manager);
1782
1783 m = link->manager;
1784
1785 HASHMAP_FOREACH(carrier, m->links, i) {
1786 if (!carrier->network)
1787 continue;
1788
1789 if (strv_isempty(carrier->network->bind_carrier))
1790 continue;
1791
1792 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
1793 r = link_put_carrier(link, carrier, &link->bound_by_links);
1794 if (r < 0)
1795 return r;
1796
1797 list_updated = true;
1798 }
1799 }
1800
1801 if (list_updated)
1802 link_dirty(link);
1803
1804 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
1805 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1806 if (r < 0)
1807 return r;
1808
1809 link_dirty(carrier);
1810 }
1811
1812 return 0;
1813 }
1814
1815 static int link_new_bound_to_list(Link *link) {
1816 Manager *m;
1817 Link *carrier;
1818 Iterator i;
1819 int r;
1820 bool list_updated = false;
1821
1822 assert(link);
1823 assert(link->manager);
1824
1825 if (!link->network)
1826 return 0;
1827
1828 if (strv_isempty(link->network->bind_carrier))
1829 return 0;
1830
1831 m = link->manager;
1832
1833 HASHMAP_FOREACH (carrier, m->links, i) {
1834 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
1835 r = link_put_carrier(link, carrier, &link->bound_to_links);
1836 if (r < 0)
1837 return r;
1838
1839 list_updated = true;
1840 }
1841 }
1842
1843 if (list_updated)
1844 link_dirty(link);
1845
1846 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
1847 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
1848 if (r < 0)
1849 return r;
1850
1851 link_dirty(carrier);
1852 }
1853
1854 return 0;
1855 }
1856
1857 static int link_new_carrier_maps(Link *link) {
1858 int r;
1859
1860 r = link_new_bound_by_list(link);
1861 if (r < 0)
1862 return r;
1863
1864 r = link_handle_bound_by_list(link);
1865 if (r < 0)
1866 return r;
1867
1868 r = link_new_bound_to_list(link);
1869 if (r < 0)
1870 return r;
1871
1872 r = link_handle_bound_to_list(link);
1873 if (r < 0)
1874 return r;
1875
1876 return 0;
1877 }
1878
1879 static void link_free_bound_to_list(Link *link) {
1880 Link *bound_to;
1881 Iterator i;
1882
1883 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
1884 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
1885
1886 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
1887 link_dirty(bound_to);
1888 }
1889
1890 return;
1891 }
1892
1893 static void link_free_bound_by_list(Link *link) {
1894 Link *bound_by;
1895 Iterator i;
1896
1897 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
1898 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
1899
1900 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
1901 link_dirty(bound_by);
1902 link_handle_bound_to_list(bound_by);
1903 }
1904 }
1905
1906 return;
1907 }
1908
1909 static void link_free_carrier_maps(Link *link) {
1910 bool list_updated = false;
1911
1912 assert(link);
1913
1914 if (!hashmap_isempty(link->bound_to_links)) {
1915 link_free_bound_to_list(link);
1916 list_updated = true;
1917 }
1918
1919 if (!hashmap_isempty(link->bound_by_links)) {
1920 link_free_bound_by_list(link);
1921 list_updated = true;
1922 }
1923
1924 if (list_updated)
1925 link_dirty(link);
1926
1927 return;
1928 }
1929
1930 static int link_append_to_master(Link *link, NetDev *netdev) {
1931 Link *master;
1932 int r;
1933
1934 assert(link);
1935 assert(netdev);
1936
1937 r = link_get(link->manager, netdev->ifindex, &master);
1938 if (r < 0)
1939 return r;
1940
1941 r = set_ensure_allocated(&master->slaves, NULL);
1942 if (r < 0)
1943 return r;
1944
1945 r = set_put(master->slaves, link);
1946 if (r < 0)
1947 return r;
1948
1949 link_ref(link);
1950 return 0;
1951 }
1952
1953 static void link_drop_from_master(Link *link, NetDev *netdev) {
1954 Link *master;
1955
1956 assert(link);
1957
1958 if (!link->manager || !netdev)
1959 return;
1960
1961 if (link_get(link->manager, netdev->ifindex, &master) < 0)
1962 return;
1963
1964 link_unref(set_remove(master->slaves, link));
1965 }
1966
1967 static void link_detach_from_manager(Link *link) {
1968 if (!link || !link->manager)
1969 return;
1970
1971 link_unref(set_remove(link->manager->links_requesting_uuid, link));
1972 link_clean(link);
1973
1974 /* The following must be called at last. */
1975 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
1976 link_unref(link);
1977 }
1978
1979 void link_drop(Link *link) {
1980 if (!link || link->state == LINK_STATE_LINGER)
1981 return;
1982
1983 link_set_state(link, LINK_STATE_LINGER);
1984
1985 link_free_carrier_maps(link);
1986
1987 if (link->network) {
1988 link_drop_from_master(link, link->network->bridge);
1989 link_drop_from_master(link, link->network->bond);
1990 }
1991
1992 log_link_debug(link, "Link removed");
1993
1994 (void) unlink(link->state_file);
1995 link_detach_from_manager(link);
1996 }
1997
1998 static int link_joined(Link *link) {
1999 int r;
2000
2001 assert(link);
2002 assert(link->network);
2003
2004 if (!hashmap_isempty(link->bound_to_links)) {
2005 r = link_handle_bound_to_list(link);
2006 if (r < 0)
2007 return r;
2008 } else if (!(link->flags & IFF_UP)) {
2009 r = link_up(link);
2010 if (r < 0) {
2011 link_enter_failed(link);
2012 return r;
2013 }
2014 }
2015
2016 if (link->network->bridge) {
2017 r = link_set_bridge(link);
2018 if (r < 0)
2019 log_link_error_errno(link, r, "Could not set bridge message: %m");
2020
2021 r = link_append_to_master(link, link->network->bridge);
2022 if (r < 0)
2023 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2024 }
2025
2026 if (link->network->bond) {
2027 r = link_set_bond(link);
2028 if (r < 0)
2029 log_link_error_errno(link, r, "Could not set bond message: %m");
2030
2031 r = link_append_to_master(link, link->network->bond);
2032 if (r < 0)
2033 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2034 }
2035
2036 if (link->network->use_br_vlan &&
2037 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2038 r = link_set_bridge_vlan(link);
2039 if (r < 0)
2040 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2041 }
2042
2043 /* Skip setting up addresses until it gets carrier,
2044 or it would try to set addresses twice,
2045 which is bad for non-idempotent steps. */
2046 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2047 return 0;
2048
2049 link_set_state(link, LINK_STATE_CONFIGURING);
2050 return link_request_set_addresses(link);
2051 }
2052
2053 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2054 int r;
2055
2056 assert(link);
2057 assert(link->network);
2058 assert(link->enslaving > 0);
2059
2060 link->enslaving--;
2061
2062 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2063 return 1;
2064
2065 r = sd_netlink_message_get_errno(m);
2066 if (r < 0 && r != -EEXIST) {
2067 log_link_error_errno(link, r, "Could not join netdev: %m");
2068 link_enter_failed(link);
2069 return 1;
2070 }
2071
2072 log_link_debug(link, "Joined netdev");
2073
2074 if (link->enslaving == 0) {
2075 r = link_joined(link);
2076 if (r < 0)
2077 link_enter_failed(link);
2078 }
2079
2080 return 1;
2081 }
2082
2083 static int link_enter_join_netdev(Link *link) {
2084 NetDev *netdev;
2085 Iterator i;
2086 int r;
2087
2088 assert(link);
2089 assert(link->network);
2090 assert(link->state == LINK_STATE_INITIALIZED);
2091
2092 link_set_state(link, LINK_STATE_CONFIGURING);
2093
2094 link_dirty(link);
2095 link->enslaving = 0;
2096
2097 if (link->network->bond) {
2098 if (link->network->bond->state == NETDEV_STATE_READY &&
2099 link->network->bond->ifindex == link->master_ifindex)
2100 return link_joined(link);
2101
2102 log_struct(LOG_DEBUG,
2103 LOG_LINK_INTERFACE(link),
2104 LOG_NETDEV_INTERFACE(link->network->bond),
2105 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2106
2107 link->enslaving++;
2108
2109 r = netdev_join(link->network->bond, link, netdev_join_handler);
2110 if (r < 0) {
2111 log_struct_errno(LOG_WARNING, r,
2112 LOG_LINK_INTERFACE(link),
2113 LOG_NETDEV_INTERFACE(link->network->bond),
2114 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2115 link_enter_failed(link);
2116 return r;
2117 }
2118 }
2119
2120 if (link->network->bridge) {
2121 log_struct(LOG_DEBUG,
2122 LOG_LINK_INTERFACE(link),
2123 LOG_NETDEV_INTERFACE(link->network->bridge),
2124 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2125
2126 link->enslaving++;
2127
2128 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2129 if (r < 0) {
2130 log_struct_errno(LOG_WARNING, r,
2131 LOG_LINK_INTERFACE(link),
2132 LOG_NETDEV_INTERFACE(link->network->bridge),
2133 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2134 link_enter_failed(link);
2135 return r;
2136 }
2137 }
2138
2139 if (link->network->vrf) {
2140 log_struct(LOG_DEBUG,
2141 LOG_LINK_INTERFACE(link),
2142 LOG_NETDEV_INTERFACE(link->network->vrf),
2143 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2144
2145 link->enslaving++;
2146
2147 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2148 if (r < 0) {
2149 log_struct_errno(LOG_WARNING, r,
2150 LOG_LINK_INTERFACE(link),
2151 LOG_NETDEV_INTERFACE(link->network->vrf),
2152 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2153 link_enter_failed(link);
2154 return r;
2155 }
2156 }
2157
2158 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2159
2160 if (netdev->ifindex > 0)
2161 /* Assume already enslaved. */
2162 continue;
2163
2164 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2165 continue;
2166
2167 log_struct(LOG_DEBUG,
2168 LOG_LINK_INTERFACE(link),
2169 LOG_NETDEV_INTERFACE(netdev),
2170 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2171
2172 link->enslaving++;
2173
2174 r = netdev_join(netdev, link, netdev_join_handler);
2175 if (r < 0) {
2176 log_struct_errno(LOG_WARNING, r,
2177 LOG_LINK_INTERFACE(link),
2178 LOG_NETDEV_INTERFACE(netdev),
2179 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2180 link_enter_failed(link);
2181 return r;
2182 }
2183 }
2184
2185 if (link->enslaving == 0)
2186 return link_joined(link);
2187
2188 return 0;
2189 }
2190
2191 static int link_set_ipv4_forward(Link *link) {
2192 int r;
2193
2194 if (!link_ipv4_forward_enabled(link))
2195 return 0;
2196
2197 /* We propagate the forwarding flag from one interface to the
2198 * global setting one way. This means: as long as at least one
2199 * interface was configured at any time that had IP forwarding
2200 * enabled the setting will stay on for good. We do this
2201 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2202 * somewhat in sync (see below). */
2203
2204 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2205 if (r < 0)
2206 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2207
2208 return 0;
2209 }
2210
2211 static int link_set_ipv6_forward(Link *link) {
2212 int r;
2213
2214 if (!link_ipv6_forward_enabled(link))
2215 return 0;
2216
2217 /* On Linux, the IPv6 stack does not know a per-interface
2218 * packet forwarding setting: either packet forwarding is on
2219 * for all, or off for all. We hence don't bother with a
2220 * per-interface setting, but simply propagate the interface
2221 * flag, if it is set, to the global flag, one-way. Note that
2222 * while IPv4 would allow a per-interface flag, we expose the
2223 * same behaviour there and also propagate the setting from
2224 * one to all, to keep things simple (see above). */
2225
2226 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2227 if (r < 0)
2228 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2229
2230 return 0;
2231 }
2232
2233 static int link_set_ipv6_privacy_extensions(Link *link) {
2234 IPv6PrivacyExtensions s;
2235 int r;
2236
2237 s = link_ipv6_privacy_extensions(link);
2238 if (s < 0)
2239 return 0;
2240
2241 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2242 if (r < 0)
2243 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2244
2245 return 0;
2246 }
2247
2248 static int link_set_ipv6_accept_ra(Link *link) {
2249 int r;
2250
2251 /* Make this a NOP if IPv6 is not available */
2252 if (!socket_ipv6_is_supported())
2253 return 0;
2254
2255 if (link->flags & IFF_LOOPBACK)
2256 return 0;
2257
2258 if (!link->network)
2259 return 0;
2260
2261 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2262 if (r < 0)
2263 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2264
2265 return 0;
2266 }
2267
2268 static int link_set_ipv6_dad_transmits(Link *link) {
2269 int r;
2270
2271 /* Make this a NOP if IPv6 is not available */
2272 if (!socket_ipv6_is_supported())
2273 return 0;
2274
2275 if (link->flags & IFF_LOOPBACK)
2276 return 0;
2277
2278 if (!link->network)
2279 return 0;
2280
2281 if (link->network->ipv6_dad_transmits < 0)
2282 return 0;
2283
2284 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2285 if (r < 0)
2286 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2287
2288 return 0;
2289 }
2290
2291 static int link_set_ipv6_hop_limit(Link *link) {
2292 int r;
2293
2294 /* Make this a NOP if IPv6 is not available */
2295 if (!socket_ipv6_is_supported())
2296 return 0;
2297
2298 if (link->flags & IFF_LOOPBACK)
2299 return 0;
2300
2301 if (!link->network)
2302 return 0;
2303
2304 if (link->network->ipv6_hop_limit < 0)
2305 return 0;
2306
2307 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2308 if (r < 0)
2309 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2310
2311 return 0;
2312 }
2313
2314 static int link_set_ipv6_mtu(Link *link) {
2315 int r;
2316
2317 /* Make this a NOP if IPv6 is not available */
2318 if (!socket_ipv6_is_supported())
2319 return 0;
2320
2321 if (link->flags & IFF_LOOPBACK)
2322 return 0;
2323
2324 if (link->network->ipv6_mtu == 0)
2325 return 0;
2326
2327 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2328 if (r < 0)
2329 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2330
2331 return 0;
2332 }
2333
2334 static bool link_is_static_address_configured(Link *link, Address *address) {
2335 Address *net_address;
2336
2337 assert(link);
2338 assert(address);
2339
2340 if (!link->network)
2341 return false;
2342
2343 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2344 if (address_equal(net_address, address))
2345 return true;
2346
2347 return false;
2348 }
2349
2350 static bool link_is_static_route_configured(Link *link, Route *route) {
2351 Route *net_route;
2352
2353 assert(link);
2354 assert(route);
2355
2356 if (!link->network)
2357 return false;
2358
2359 LIST_FOREACH(routes, net_route, link->network->static_routes)
2360 if (route_equal(net_route, route))
2361 return true;
2362
2363 return false;
2364 }
2365
2366 static bool link_address_is_dynamic(Link *link, Address *address) {
2367 Route *route;
2368 Iterator i;
2369
2370 assert(link);
2371 assert(address);
2372
2373 if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2374 return true;
2375
2376 /* Even when the address is leased from a DHCP server, networkd assign the address
2377 * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2378 * corresponding routes with RTPROT_DHCP. */
2379 SET_FOREACH(route, link->routes_foreign, i) {
2380 if (route->protocol != RTPROT_DHCP)
2381 continue;
2382
2383 if (address->family != route->family)
2384 continue;
2385
2386 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2387 return true;
2388 }
2389
2390 return false;
2391 }
2392
2393 static int link_drop_foreign_config(Link *link) {
2394 Address *address;
2395 Route *route;
2396 Iterator i;
2397 int r;
2398
2399 SET_FOREACH(address, link->addresses_foreign, i) {
2400 /* we consider IPv6LL addresses to be managed by the kernel */
2401 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2402 continue;
2403
2404 if (link_address_is_dynamic(link, address)) {
2405 if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2406 continue;
2407 } else if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2408 continue;
2409
2410 if (link_is_static_address_configured(link, address)) {
2411 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2412 if (r < 0)
2413 return log_link_error_errno(link, r, "Failed to add address: %m");
2414 } else {
2415 r = address_remove(address, link, NULL);
2416 if (r < 0)
2417 return r;
2418 }
2419 }
2420
2421 SET_FOREACH(route, link->routes_foreign, i) {
2422 /* do not touch routes managed by the kernel */
2423 if (route->protocol == RTPROT_KERNEL)
2424 continue;
2425
2426 /* do not touch multicast route added by kernel */
2427 /* FIXME: Why the kernel adds this route with protocol RTPROT_BOOT??? We need to investigate that.
2428 * https://tools.ietf.org/html/rfc4862#section-5.4 may explain why. */
2429 if (route->protocol == RTPROT_BOOT &&
2430 route->family == AF_INET6 &&
2431 route->dst_prefixlen == 8 &&
2432 in_addr_equal(AF_INET6, &route->dst, &(union in_addr_union) { .in6 = {{{ 0xff,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0 }}} }))
2433 continue;
2434
2435 if (route->protocol == RTPROT_STATIC &&
2436 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2437 continue;
2438
2439 if (route->protocol == RTPROT_DHCP &&
2440 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2441 continue;
2442
2443 if (link_is_static_route_configured(link, route)) {
2444 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, &route->gw, route->tos, route->priority, route->table, NULL);
2445 if (r < 0)
2446 return r;
2447 } else {
2448 r = route_remove(route, link, NULL);
2449 if (r < 0)
2450 return r;
2451 }
2452 }
2453
2454 return 0;
2455 }
2456
2457 static int link_drop_config(Link *link) {
2458 Address *address, *pool_address;
2459 Route *route;
2460 Iterator i;
2461 int r;
2462
2463 SET_FOREACH(address, link->addresses, i) {
2464 /* we consider IPv6LL addresses to be managed by the kernel */
2465 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2466 continue;
2467
2468 r = address_remove(address, link, NULL);
2469 if (r < 0)
2470 return r;
2471
2472 /* If this address came from an address pool, clean up the pool */
2473 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2474 if (address_equal(address, pool_address)) {
2475 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2476 address_free(pool_address);
2477 break;
2478 }
2479 }
2480 }
2481
2482 SET_FOREACH(route, link->routes, i) {
2483 /* do not touch routes managed by the kernel */
2484 if (route->protocol == RTPROT_KERNEL)
2485 continue;
2486
2487 r = route_remove(route, link, NULL);
2488 if (r < 0)
2489 return r;
2490 }
2491
2492 ndisc_flush(link);
2493
2494 return 0;
2495 }
2496
2497 static int link_configure(Link *link) {
2498 int r;
2499
2500 assert(link);
2501 assert(link->network);
2502 assert(link->state == LINK_STATE_INITIALIZED);
2503
2504 if (link->iftype == ARPHRD_CAN)
2505 return link_configure_can(link);
2506
2507 /* Drop foreign config, but ignore loopback or critical devices.
2508 * We do not want to remove loopback address or addresses used for root NFS. */
2509 if (!(link->flags & IFF_LOOPBACK) &&
2510 link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
2511 r = link_drop_foreign_config(link);
2512 if (r < 0)
2513 return r;
2514 }
2515
2516 r = link_set_proxy_arp(link);
2517 if (r < 0)
2518 return r;
2519
2520 r = ipv6_proxy_ndp_addresses_configure(link);
2521 if (r < 0)
2522 return r;
2523
2524 r = link_set_ipv4_forward(link);
2525 if (r < 0)
2526 return r;
2527
2528 r = link_set_ipv6_forward(link);
2529 if (r < 0)
2530 return r;
2531
2532 r = link_set_ipv6_privacy_extensions(link);
2533 if (r < 0)
2534 return r;
2535
2536 r = link_set_ipv6_accept_ra(link);
2537 if (r < 0)
2538 return r;
2539
2540 r = link_set_ipv6_dad_transmits(link);
2541 if (r < 0)
2542 return r;
2543
2544 r = link_set_ipv6_hop_limit(link);
2545 if (r < 0)
2546 return r;
2547
2548 r = link_set_flags(link);
2549 if (r < 0)
2550 return r;
2551
2552 r = link_set_ipv6_mtu(link);
2553 if (r < 0)
2554 return r;
2555
2556 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
2557 r = ipv4ll_configure(link);
2558 if (r < 0)
2559 return r;
2560 }
2561
2562 if (link_dhcp4_enabled(link)) {
2563 r = dhcp4_set_promote_secondaries(link);
2564 if (r < 0)
2565 return r;
2566
2567 r = dhcp4_configure(link);
2568 if (r < 0)
2569 return r;
2570 }
2571
2572 if (link_dhcp4_server_enabled(link)) {
2573 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2574 if (r < 0)
2575 return r;
2576
2577 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2578 if (r < 0)
2579 return r;
2580 }
2581
2582 if (link_dhcp6_enabled(link) ||
2583 link_ipv6_accept_ra_enabled(link)) {
2584 r = dhcp6_configure(link);
2585 if (r < 0)
2586 return r;
2587 }
2588
2589 if (link_ipv6_accept_ra_enabled(link)) {
2590 r = ndisc_configure(link);
2591 if (r < 0)
2592 return r;
2593 }
2594
2595 if (link_radv_enabled(link)) {
2596 r = radv_configure(link);
2597 if (r < 0)
2598 return r;
2599 }
2600
2601 if (link_lldp_rx_enabled(link)) {
2602 r = link_lldp_rx_configure(link);
2603 if (r < 0)
2604 return r;
2605 }
2606
2607 r = link_configure_mtu(link);
2608 if (r < 0)
2609 return r;
2610
2611 r = link_configure_addrgen_mode(link);
2612 if (r < 0)
2613 return r;
2614
2615 return link_configure_after_setting_mtu(link);
2616 }
2617
2618 static int link_configure_after_setting_mtu(Link *link) {
2619 int r;
2620
2621 assert(link);
2622 assert(link->network);
2623 assert(link->state == LINK_STATE_INITIALIZED);
2624
2625 if (link->setting_mtu)
2626 return 0;
2627
2628 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2629 r = link_acquire_conf(link);
2630 if (r < 0)
2631 return r;
2632 }
2633
2634 return link_enter_join_netdev(link);
2635 }
2636
2637 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
2638 assert(duid);
2639
2640 if (duid->raw_data_len > 0)
2641 return 0;
2642
2643 if (duid->type != DUID_TYPE_UUID)
2644 return -EINVAL;
2645
2646 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
2647 duid->raw_data_len = sizeof(sd_id128_t);
2648
2649 return 1;
2650 }
2651
2652 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
2653 Manager *manager = userdata;
2654 const sd_bus_error *e;
2655 const void *a;
2656 size_t sz;
2657 DUID *duid;
2658 Link *link;
2659 int r;
2660
2661 assert(m);
2662 assert(manager);
2663
2664 e = sd_bus_message_get_error(m);
2665 if (e) {
2666 log_error_errno(sd_bus_error_get_errno(e),
2667 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
2668 e->message);
2669 goto configure;
2670 }
2671
2672 r = sd_bus_message_read_array(m, 'y', &a, &sz);
2673 if (r < 0)
2674 goto configure;
2675
2676 if (sz != sizeof(sd_id128_t)) {
2677 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
2678 goto configure;
2679 }
2680
2681 memcpy(&manager->product_uuid, a, sz);
2682 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
2683 (void) duid_set_uuid(duid, manager->product_uuid);
2684
2685 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
2686
2687 configure:
2688 while ((link = set_steal_first(manager->links_requesting_uuid))) {
2689 r = link_configure(link);
2690 if (r < 0)
2691 link_enter_failed(link);
2692 }
2693
2694 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
2695
2696 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
2697 * even if the method fails. */
2698 manager->has_product_uuid = true;
2699
2700 return 1;
2701 }
2702
2703 static bool link_requires_uuid(Link *link) {
2704 const DUID *duid;
2705
2706 assert(link);
2707 assert(link->manager);
2708 assert(link->network);
2709
2710 duid = link_get_duid(link);
2711 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
2712 return false;
2713
2714 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
2715 return true;
2716
2717 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
2718 return true;
2719
2720 return false;
2721 }
2722
2723 static int link_configure_duid(Link *link) {
2724 Manager *m;
2725 DUID *duid;
2726 int r;
2727
2728 assert(link);
2729 assert(link->manager);
2730 assert(link->network);
2731
2732 m = link->manager;
2733 duid = link_get_duid(link);
2734
2735 if (!link_requires_uuid(link))
2736 return 1;
2737
2738 if (m->has_product_uuid) {
2739 (void) duid_set_uuid(duid, m->product_uuid);
2740 return 1;
2741 }
2742
2743 if (!m->links_requesting_uuid) {
2744 r = manager_request_product_uuid(m, link);
2745 if (r < 0) {
2746 if (r == -ENOMEM)
2747 return r;
2748
2749 log_link_warning_errno(link, r,
2750 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
2751 return 1;
2752 }
2753 } else {
2754 r = set_put(m->links_requesting_uuid, link);
2755 if (r < 0)
2756 return log_oom();
2757
2758 r = set_put(m->duids_requesting_uuid, duid);
2759 if (r < 0)
2760 return log_oom();
2761 }
2762
2763 return 0;
2764 }
2765
2766 static int link_initialized_and_synced(Link *link) {
2767 Network *network;
2768 int r;
2769
2770 assert(link);
2771 assert(link->ifname);
2772 assert(link->manager);
2773
2774 /* We may get called either from the asynchronous netlink callback,
2775 * or directly for link_add() if running in a container. See link_add(). */
2776 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
2777 return 0;
2778
2779 log_link_debug(link, "Link state is up-to-date");
2780 link_set_state(link, LINK_STATE_INITIALIZED);
2781
2782 r = link_new_bound_by_list(link);
2783 if (r < 0)
2784 return r;
2785
2786 r = link_handle_bound_by_list(link);
2787 if (r < 0)
2788 return r;
2789
2790 if (!link->network) {
2791 r = network_get(link->manager, link->sd_device, link->ifname,
2792 &link->mac, &network);
2793 if (r == -ENOENT) {
2794 link_enter_unmanaged(link);
2795 return 0;
2796 } else if (r == 0 && network->unmanaged) {
2797 link_enter_unmanaged(link);
2798 return 0;
2799 } else if (r < 0)
2800 return r;
2801
2802 if (link->flags & IFF_LOOPBACK) {
2803 if (network->link_local != ADDRESS_FAMILY_NO)
2804 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2805
2806 if (network->dhcp != ADDRESS_FAMILY_NO)
2807 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2808
2809 if (network->dhcp_server)
2810 log_link_debug(link, "Ignoring DHCP server for loopback link");
2811 }
2812
2813 r = network_apply(network, link);
2814 if (r < 0)
2815 return r;
2816 }
2817
2818 r = link_new_bound_to_list(link);
2819 if (r < 0)
2820 return r;
2821
2822 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
2823 * link_configure() is called later asynchronously. */
2824 r = link_configure_duid(link);
2825 if (r <= 0)
2826 return r;
2827
2828 r = link_configure(link);
2829 if (r < 0)
2830 return r;
2831
2832 return 0;
2833 }
2834
2835 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2836 int r;
2837
2838 r = link_initialized_and_synced(link);
2839 if (r < 0)
2840 link_enter_failed(link);
2841 return 1;
2842 }
2843
2844 int link_initialized(Link *link, sd_device *device) {
2845 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2846 int r;
2847
2848 assert(link);
2849 assert(link->manager);
2850 assert(link->manager->rtnl);
2851 assert(device);
2852
2853 if (link->state != LINK_STATE_PENDING)
2854 return 0;
2855
2856 if (link->sd_device)
2857 return 0;
2858
2859 log_link_debug(link, "udev initialized link");
2860 link_set_state(link, LINK_STATE_INITIALIZED);
2861
2862 link->sd_device = sd_device_ref(device);
2863
2864 /* udev has initialized the link, but we don't know if we have yet
2865 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2866 * when it returns we know that the pending NEWLINKs have already been
2867 * processed and that we are up-to-date */
2868
2869 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2870 link->ifindex);
2871 if (r < 0)
2872 return r;
2873
2874 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
2875 link_netlink_destroy_callback, link);
2876 if (r < 0)
2877 return r;
2878
2879 link_ref(link);
2880
2881 return 0;
2882 }
2883
2884 static int link_load(Link *link) {
2885 _cleanup_free_ char *network_file = NULL,
2886 *addresses = NULL,
2887 *routes = NULL,
2888 *dhcp4_address = NULL,
2889 *ipv4ll_address = NULL;
2890 union in_addr_union address;
2891 union in_addr_union route_dst;
2892 const char *p;
2893 int r;
2894
2895 assert(link);
2896
2897 r = parse_env_file(NULL, link->state_file,
2898 "NETWORK_FILE", &network_file,
2899 "ADDRESSES", &addresses,
2900 "ROUTES", &routes,
2901 "DHCP4_ADDRESS", &dhcp4_address,
2902 "IPV4LL_ADDRESS", &ipv4ll_address);
2903 if (r < 0 && r != -ENOENT)
2904 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
2905
2906 if (network_file) {
2907 Network *network;
2908 char *suffix;
2909
2910 /* drop suffix */
2911 suffix = strrchr(network_file, '.');
2912 if (!suffix) {
2913 log_link_debug(link, "Failed to get network name from %s", network_file);
2914 goto network_file_fail;
2915 }
2916 *suffix = '\0';
2917
2918 r = network_get_by_name(link->manager, basename(network_file), &network);
2919 if (r < 0) {
2920 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
2921 goto network_file_fail;
2922 }
2923
2924 r = network_apply(network, link);
2925 if (r < 0)
2926 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
2927 }
2928
2929 network_file_fail:
2930
2931 if (addresses) {
2932 p = addresses;
2933
2934 for (;;) {
2935 _cleanup_free_ char *address_str = NULL;
2936 char *prefixlen_str;
2937 int family;
2938 unsigned char prefixlen;
2939
2940 r = extract_first_word(&p, &address_str, NULL, 0);
2941 if (r < 0) {
2942 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
2943 continue;
2944 }
2945 if (r == 0)
2946 break;
2947
2948 prefixlen_str = strchr(address_str, '/');
2949 if (!prefixlen_str) {
2950 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
2951 continue;
2952 }
2953
2954 *prefixlen_str++ = '\0';
2955
2956 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
2957 if (r != 1) {
2958 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
2959 continue;
2960 }
2961
2962 r = in_addr_from_string_auto(address_str, &family, &address);
2963 if (r < 0) {
2964 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
2965 continue;
2966 }
2967
2968 r = address_add(link, family, &address, prefixlen, NULL);
2969 if (r < 0)
2970 return log_link_error_errno(link, r, "Failed to add address: %m");
2971 }
2972 }
2973
2974 if (routes) {
2975 p = routes;
2976
2977 for (;;) {
2978 Route *route;
2979 _cleanup_free_ char *route_str = NULL;
2980 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
2981 usec_t lifetime;
2982 char *prefixlen_str;
2983 int family;
2984 unsigned char prefixlen, tos, table;
2985 uint32_t priority;
2986
2987 r = extract_first_word(&p, &route_str, NULL, 0);
2988 if (r < 0) {
2989 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
2990 continue;
2991 }
2992 if (r == 0)
2993 break;
2994
2995 prefixlen_str = strchr(route_str, '/');
2996 if (!prefixlen_str) {
2997 log_link_debug(link, "Failed to parse route %s", route_str);
2998 continue;
2999 }
3000
3001 *prefixlen_str++ = '\0';
3002
3003 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3004 if (r != 5) {
3005 log_link_debug(link,
3006 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3007 prefixlen_str);
3008 continue;
3009 }
3010
3011 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3012 if (r < 0) {
3013 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3014 continue;
3015 }
3016
3017 r = route_add(link, family, &route_dst, prefixlen, NULL, tos, priority, table, &route);
3018 if (r < 0)
3019 return log_link_error_errno(link, r, "Failed to add route: %m");
3020
3021 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3022 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3023 0, route_expire_handler, route);
3024 if (r < 0)
3025 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3026 }
3027
3028 route->lifetime = lifetime;
3029 sd_event_source_unref(route->expire);
3030 route->expire = TAKE_PTR(expire);
3031 }
3032 }
3033
3034 if (dhcp4_address) {
3035 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3036 if (r < 0) {
3037 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3038 goto dhcp4_address_fail;
3039 }
3040
3041 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3042 if (r < 0)
3043 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3044
3045 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3046 if (r < 0)
3047 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3048 }
3049
3050 dhcp4_address_fail:
3051
3052 if (ipv4ll_address) {
3053 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3054 if (r < 0) {
3055 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3056 goto ipv4ll_address_fail;
3057 }
3058
3059 r = sd_ipv4ll_new(&link->ipv4ll);
3060 if (r < 0)
3061 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3062
3063 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3064 if (r < 0)
3065 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3066 }
3067
3068 ipv4ll_address_fail:
3069
3070 return 0;
3071 }
3072
3073 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3074 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3075 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3076 Link *link;
3077 int r;
3078
3079 assert(m);
3080 assert(m->rtnl);
3081 assert(message);
3082 assert(ret);
3083
3084 r = link_new(m, message, ret);
3085 if (r < 0)
3086 return r;
3087
3088 link = *ret;
3089
3090 log_link_debug(link, "Link %d added", link->ifindex);
3091
3092 r = link_load(link);
3093 if (r < 0)
3094 return r;
3095
3096 if (detect_container() <= 0) {
3097 /* not in a container, udev will be around */
3098 sprintf(ifindex_str, "n%d", link->ifindex);
3099 r = sd_device_new_from_device_id(&device, ifindex_str);
3100 if (r < 0) {
3101 log_link_warning_errno(link, r, "Could not find device: %m");
3102 goto failed;
3103 }
3104
3105 r = sd_device_get_is_initialized(device);
3106 if (r < 0) {
3107 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3108 goto failed;
3109 }
3110 if (r == 0) {
3111 /* not yet ready */
3112 log_link_debug(link, "link pending udev initialization...");
3113 return 0;
3114 }
3115
3116 r = device_is_renaming(device);
3117 if (r < 0) {
3118 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3119 goto failed;
3120 }
3121 if (r > 0) {
3122 log_link_debug(link, "Interface is under renaming, pending initialization.");
3123 return 0;
3124 }
3125
3126 r = link_initialized(link, device);
3127 if (r < 0)
3128 goto failed;
3129 } else {
3130 r = link_initialized_and_synced(link);
3131 if (r < 0)
3132 goto failed;
3133 }
3134
3135 return 0;
3136 failed:
3137 link_enter_failed(link);
3138 return r;
3139 }
3140
3141 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3142 int r;
3143
3144 assert(link);
3145
3146 log_link_info(link, "Gained IPv6LL");
3147
3148 link->ipv6ll_address = *address;
3149 link_check_ready(link);
3150
3151 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3152 r = link_acquire_ipv6_conf(link);
3153 if (r < 0) {
3154 link_enter_failed(link);
3155 return r;
3156 }
3157 }
3158
3159 return 0;
3160 }
3161
3162 static int link_carrier_gained(Link *link) {
3163 int r;
3164
3165 assert(link);
3166
3167 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3168 r = link_acquire_conf(link);
3169 if (r < 0) {
3170 link_enter_failed(link);
3171 return r;
3172 }
3173
3174 link_set_state(link, LINK_STATE_CONFIGURING);
3175 r = link_request_set_addresses(link);
3176 if (r < 0)
3177 return r;
3178 }
3179
3180 r = link_handle_bound_by_list(link);
3181 if (r < 0)
3182 return r;
3183
3184 return 0;
3185 }
3186
3187 static int link_carrier_lost(Link *link) {
3188 int r;
3189
3190 assert(link);
3191
3192 if (link->network && link->network->ignore_carrier_loss)
3193 return 0;
3194
3195 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3196 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3197 * configuration and stop the clients as well. */
3198 if (link->setting_mtu)
3199 return 0;
3200
3201 r = link_stop_clients(link, false);
3202 if (r < 0) {
3203 link_enter_failed(link);
3204 return r;
3205 }
3206
3207 if (link_dhcp4_server_enabled(link))
3208 (void) sd_dhcp_server_stop(link->dhcp_server);
3209
3210 r = link_drop_config(link);
3211 if (r < 0)
3212 return r;
3213
3214 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3215 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3216 r = link_drop_foreign_config(link);
3217 if (r < 0)
3218 return r;
3219 }
3220
3221 r = link_handle_bound_by_list(link);
3222 if (r < 0)
3223 return r;
3224
3225 return 0;
3226 }
3227
3228 int link_carrier_reset(Link *link) {
3229 int r;
3230
3231 assert(link);
3232
3233 if (link_has_carrier(link)) {
3234 r = link_carrier_lost(link);
3235 if (r < 0)
3236 return r;
3237
3238 r = link_carrier_gained(link);
3239 if (r < 0)
3240 return r;
3241
3242 log_link_info(link, "Reset carrier");
3243 }
3244
3245 return 0;
3246 }
3247
3248 int link_update(Link *link, sd_netlink_message *m) {
3249 struct ether_addr mac;
3250 const char *ifname;
3251 uint32_t mtu;
3252 bool had_carrier, carrier_gained, carrier_lost;
3253 int old_master, r;
3254
3255 assert(link);
3256 assert(link->ifname);
3257 assert(m);
3258
3259 if (link->state == LINK_STATE_LINGER) {
3260 log_link_info(link, "Link re-added");
3261 link_set_state(link, LINK_STATE_CONFIGURING);
3262
3263 r = link_new_carrier_maps(link);
3264 if (r < 0)
3265 return r;
3266 }
3267
3268 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3269 if (r >= 0 && !streq(ifname, link->ifname)) {
3270 Manager *manager = link->manager;
3271
3272 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3273
3274 link_drop(link);
3275 r = link_add(manager, m, &link);
3276 if (r < 0)
3277 return r;
3278 }
3279
3280 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3281 if (r >= 0 && mtu > 0) {
3282 link->mtu = mtu;
3283 if (link->original_mtu == 0) {
3284 link->original_mtu = mtu;
3285 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3286 }
3287
3288 if (link->dhcp_client) {
3289 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3290 link->mtu);
3291 if (r < 0)
3292 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3293 }
3294
3295 if (link->radv) {
3296 r = sd_radv_set_mtu(link->radv, link->mtu);
3297 if (r < 0)
3298 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3299 }
3300 }
3301
3302 /* The kernel may broadcast NEWLINK messages without the MAC address
3303 set, simply ignore them. */
3304 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3305 if (r >= 0) {
3306 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3307 ETH_ALEN)) {
3308
3309 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3310 ETH_ALEN);
3311
3312 log_link_debug(link, "MAC address: "
3313 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3314 mac.ether_addr_octet[0],
3315 mac.ether_addr_octet[1],
3316 mac.ether_addr_octet[2],
3317 mac.ether_addr_octet[3],
3318 mac.ether_addr_octet[4],
3319 mac.ether_addr_octet[5]);
3320
3321 if (link->ipv4ll) {
3322 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3323 if (r < 0)
3324 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3325 }
3326
3327 if (link->dhcp_client) {
3328 r = sd_dhcp_client_set_mac(link->dhcp_client,
3329 (const uint8_t *) &link->mac,
3330 sizeof (link->mac),
3331 ARPHRD_ETHER);
3332 if (r < 0)
3333 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3334
3335 r = dhcp4_set_client_identifier(link);
3336 if (r < 0)
3337 return r;
3338 }
3339
3340 if (link->dhcp6_client) {
3341 const DUID* duid = link_get_duid(link);
3342
3343 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3344 (const uint8_t *) &link->mac,
3345 sizeof (link->mac),
3346 ARPHRD_ETHER);
3347 if (r < 0)
3348 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3349
3350 if (link->network->iaid_set) {
3351 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3352 link->network->iaid);
3353 if (r < 0)
3354 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3355 }
3356
3357 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3358 duid->type,
3359 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3360 duid->raw_data_len);
3361 if (r < 0)
3362 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3363 }
3364
3365 if (link->radv) {
3366 r = sd_radv_set_mac(link->radv, &link->mac);
3367 if (r < 0)
3368 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3369 }
3370
3371 if (link->ndisc) {
3372 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3373 if (r < 0)
3374 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3375 }
3376 }
3377 }
3378
3379 old_master = link->master_ifindex;
3380 (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
3381
3382 had_carrier = link_has_carrier(link);
3383
3384 r = link_update_flags(link, m, old_master != link->master_ifindex);
3385 if (r < 0)
3386 return r;
3387
3388 r = link_update_lldp(link);
3389 if (r < 0)
3390 return r;
3391
3392 carrier_gained = !had_carrier && link_has_carrier(link);
3393 carrier_lost = had_carrier && !link_has_carrier(link);
3394
3395 if (carrier_gained) {
3396 log_link_info(link, "Gained carrier");
3397
3398 r = link_carrier_gained(link);
3399 if (r < 0)
3400 return r;
3401 } else if (carrier_lost) {
3402 log_link_info(link, "Lost carrier");
3403
3404 r = link_carrier_lost(link);
3405 if (r < 0)
3406 return r;
3407 }
3408
3409 return 0;
3410 }
3411
3412 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3413 bool space = false;
3414 Iterator i;
3415 Link *link;
3416
3417 assert(f);
3418 assert(prefix);
3419
3420 if (hashmap_isempty(h))
3421 return;
3422
3423 fputs(prefix, f);
3424 HASHMAP_FOREACH(link, h, i) {
3425 if (space)
3426 fputc(' ', f);
3427
3428 fprintf(f, "%i", link->ifindex);
3429 space = true;
3430 }
3431
3432 fputc('\n', f);
3433 }
3434
3435 static void link_save_dns(FILE *f, struct in_addr_data *dns, unsigned n_dns, bool *space) {
3436 unsigned j;
3437 int r;
3438
3439 for (j = 0; j < n_dns; j++) {
3440 _cleanup_free_ char *b = NULL;
3441
3442 r = in_addr_to_string(dns[j].family, &dns[j].address, &b);
3443 if (r < 0) {
3444 log_debug_errno(r, "Failed to format address, ignoring: %m");
3445 continue;
3446 }
3447
3448 if (*space)
3449 fputc(' ', f);
3450 fputs(b, f);
3451 *space = true;
3452 }
3453 }
3454
3455 int link_save(Link *link) {
3456 _cleanup_free_ char *temp_path = NULL;
3457 _cleanup_fclose_ FILE *f = NULL;
3458 const char *admin_state, *oper_state, *carrier_state, *address_state;
3459 Address *a;
3460 Route *route;
3461 Iterator i;
3462 int r;
3463
3464 assert(link);
3465 assert(link->state_file);
3466 assert(link->lease_file);
3467 assert(link->manager);
3468
3469 if (link->state == LINK_STATE_LINGER) {
3470 (void) unlink(link->state_file);
3471 return 0;
3472 }
3473
3474 link_lldp_save(link);
3475
3476 admin_state = link_state_to_string(link->state);
3477 assert(admin_state);
3478
3479 oper_state = link_operstate_to_string(link->operstate);
3480 assert(oper_state);
3481
3482 carrier_state = link_carrier_state_to_string(link->carrier_state);
3483 assert(carrier_state);
3484
3485 address_state = link_address_state_to_string(link->address_state);
3486 assert(address_state);
3487
3488 r = fopen_temporary(link->state_file, &f, &temp_path);
3489 if (r < 0)
3490 goto fail;
3491
3492 (void) fchmod(fileno(f), 0644);
3493
3494 fprintf(f,
3495 "# This is private data. Do not parse.\n"
3496 "ADMIN_STATE=%s\n"
3497 "OPER_STATE=%s\n"
3498 "CARRIER_STATE=%s\n"
3499 "ADDRESS_STATE=%s\n",
3500 admin_state, oper_state, carrier_state, address_state);
3501
3502 if (link->network) {
3503 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
3504 const char *dhcp_domainname = NULL, *p;
3505 sd_dhcp6_lease *dhcp6_lease = NULL;
3506 bool space;
3507
3508 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3509 yes_no(link->network->required_for_online));
3510
3511 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
3512 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
3513
3514 if (link->dhcp6_client) {
3515 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3516 if (r < 0 && r != -ENOMSG)
3517 log_link_debug(link, "No DHCPv6 lease");
3518 }
3519
3520 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3521
3522 fputs("DNS=", f);
3523 space = false;
3524
3525 if (link->n_dns != (unsigned) -1)
3526 link_save_dns(f, link->dns, link->n_dns, &space);
3527 else
3528 link_save_dns(f, link->network->dns, link->network->n_dns, &space);
3529
3530 if (link->network->dhcp_use_dns &&
3531 link->dhcp_lease) {
3532 const struct in_addr *addresses;
3533
3534 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3535 if (r > 0)
3536 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3537 space = true;
3538 }
3539
3540 if (link->network->dhcp6_use_dns && dhcp6_lease) {
3541 struct in6_addr *in6_addrs;
3542
3543 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3544 if (r > 0) {
3545 if (space)
3546 fputc(' ', f);
3547 serialize_in6_addrs(f, in6_addrs, r);
3548 space = true;
3549 }
3550 }
3551
3552 /* Make sure to flush out old entries before we use the NDISC data */
3553 ndisc_vacuum(link);
3554
3555 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3556 NDiscRDNSS *dd;
3557
3558 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3559 if (space)
3560 fputc(' ', f);
3561
3562 serialize_in6_addrs(f, &dd->address, 1);
3563 space = true;
3564 }
3565 }
3566
3567 fputc('\n', f);
3568
3569 fputs("NTP=", f);
3570 space = false;
3571 fputstrv(f, link->ntp ?: link->network->ntp, NULL, &space);
3572
3573 if (link->network->dhcp_use_ntp &&
3574 link->dhcp_lease) {
3575 const struct in_addr *addresses;
3576
3577 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3578 if (r > 0)
3579 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3580 space = true;
3581 }
3582
3583 if (link->network->dhcp6_use_ntp && dhcp6_lease) {
3584 struct in6_addr *in6_addrs;
3585 char **hosts;
3586
3587 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3588 &in6_addrs);
3589 if (r > 0) {
3590 if (space)
3591 fputc(' ', f);
3592 serialize_in6_addrs(f, in6_addrs, r);
3593 space = true;
3594 }
3595
3596 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3597 if (r > 0)
3598 fputstrv(f, hosts, NULL, &space);
3599 }
3600
3601 fputc('\n', f);
3602
3603 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3604 if (link->dhcp_lease) {
3605 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3606 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3607 }
3608 if (dhcp6_lease)
3609 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3610 }
3611
3612 fputs("DOMAINS=", f);
3613 space = false;
3614 ORDERED_SET_FOREACH(p, link->search_domains ?: link->network->search_domains, i)
3615 fputs_with_space(f, p, NULL, &space);
3616
3617 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3618 if (dhcp_domainname)
3619 fputs_with_space(f, dhcp_domainname, NULL, &space);
3620 if (dhcp_domains)
3621 fputstrv(f, dhcp_domains, NULL, &space);
3622 if (dhcp6_domains)
3623 fputstrv(f, dhcp6_domains, NULL, &space);
3624 }
3625
3626 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_YES) {
3627 NDiscDNSSL *dd;
3628
3629 SET_FOREACH(dd, link->ndisc_dnssl, i)
3630 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3631 }
3632
3633 fputc('\n', f);
3634
3635 fputs("ROUTE_DOMAINS=", f);
3636 space = false;
3637 ORDERED_SET_FOREACH(p, link->route_domains ?: link->network->route_domains, i)
3638 fputs_with_space(f, p, NULL, &space);
3639
3640 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3641 if (dhcp_domainname)
3642 fputs_with_space(f, dhcp_domainname, NULL, &space);
3643 if (dhcp_domains)
3644 fputstrv(f, dhcp_domains, NULL, &space);
3645 if (dhcp6_domains)
3646 fputstrv(f, dhcp6_domains, NULL, &space);
3647 }
3648
3649 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3650 NDiscDNSSL *dd;
3651
3652 SET_FOREACH(dd, link->ndisc_dnssl, i)
3653 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3654 }
3655
3656 fputc('\n', f);
3657
3658 fprintf(f, "LLMNR=%s\n",
3659 resolve_support_to_string(link->llmnr >= 0 ? link->llmnr : link->network->llmnr));
3660 fprintf(f, "MDNS=%s\n",
3661 resolve_support_to_string(link->mdns >= 0 ? link->mdns : link->network->mdns));
3662 if (link->dns_default_route >= 0)
3663 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->dns_default_route));
3664 else if (link->network->dns_default_route >= 0)
3665 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
3666
3667 if (link->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3668 fprintf(f, "DNS_OVER_TLS=%s\n",
3669 dns_over_tls_mode_to_string(link->dns_over_tls_mode));
3670 else if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3671 fprintf(f, "DNS_OVER_TLS=%s\n",
3672 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
3673
3674 if (link->dnssec_mode != _DNSSEC_MODE_INVALID)
3675 fprintf(f, "DNSSEC=%s\n",
3676 dnssec_mode_to_string(link->dnssec_mode));
3677 else if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3678 fprintf(f, "DNSSEC=%s\n",
3679 dnssec_mode_to_string(link->network->dnssec_mode));
3680
3681 if (!set_isempty(link->dnssec_negative_trust_anchors)) {
3682 const char *n;
3683
3684 fputs("DNSSEC_NTA=", f);
3685 space = false;
3686 SET_FOREACH(n, link->dnssec_negative_trust_anchors, i)
3687 fputs_with_space(f, n, NULL, &space);
3688 fputc('\n', f);
3689 } else if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3690 const char *n;
3691
3692 fputs("DNSSEC_NTA=", f);
3693 space = false;
3694 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3695 fputs_with_space(f, n, NULL, &space);
3696 fputc('\n', f);
3697 }
3698
3699 fputs("ADDRESSES=", f);
3700 space = false;
3701 SET_FOREACH(a, link->addresses, i) {
3702 _cleanup_free_ char *address_str = NULL;
3703
3704 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3705 if (r < 0)
3706 goto fail;
3707
3708 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3709 space = true;
3710 }
3711 fputc('\n', f);
3712
3713 fputs("ROUTES=", f);
3714 space = false;
3715 SET_FOREACH(route, link->routes, i) {
3716 _cleanup_free_ char *route_str = NULL;
3717
3718 r = in_addr_to_string(route->family, &route->dst, &route_str);
3719 if (r < 0)
3720 goto fail;
3721
3722 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
3723 space ? " " : "", route_str,
3724 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3725 space = true;
3726 }
3727
3728 fputc('\n', f);
3729 }
3730
3731 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3732 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3733
3734 if (link->dhcp_lease) {
3735 struct in_addr address;
3736 const char *tz = NULL;
3737
3738 assert(link->network);
3739
3740 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3741 if (r >= 0)
3742 fprintf(f, "TIMEZONE=%s\n", tz);
3743
3744 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3745 if (r >= 0) {
3746 fputs("DHCP4_ADDRESS=", f);
3747 serialize_in_addrs(f, &address, 1, false, NULL);
3748 fputc('\n', f);
3749 }
3750
3751 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3752 if (r < 0)
3753 goto fail;
3754
3755 fprintf(f,
3756 "DHCP_LEASE=%s\n",
3757 link->lease_file);
3758 } else
3759 (void) unlink(link->lease_file);
3760
3761 if (link->ipv4ll) {
3762 struct in_addr address;
3763
3764 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3765 if (r >= 0) {
3766 fputs("IPV4LL_ADDRESS=", f);
3767 serialize_in_addrs(f, &address, 1, false, NULL);
3768 fputc('\n', f);
3769 }
3770 }
3771
3772 r = fflush_and_check(f);
3773 if (r < 0)
3774 goto fail;
3775
3776 if (rename(temp_path, link->state_file) < 0) {
3777 r = -errno;
3778 goto fail;
3779 }
3780
3781 return 0;
3782
3783 fail:
3784 (void) unlink(link->state_file);
3785 if (temp_path)
3786 (void) unlink(temp_path);
3787
3788 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3789 }
3790
3791 /* The serialized state in /run is no longer up-to-date. */
3792 void link_dirty(Link *link) {
3793 int r;
3794
3795 assert(link);
3796
3797 /* mark manager dirty as link is dirty */
3798 manager_dirty(link->manager);
3799
3800 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3801 if (r < 0)
3802 /* allocation errors are ignored */
3803 return;
3804
3805 r = set_put(link->manager->dirty_links, link);
3806 if (r <= 0)
3807 /* don't take another ref if the link was already dirty */
3808 return;
3809
3810 link_ref(link);
3811 }
3812
3813 /* The serialized state in /run is up-to-date */
3814 void link_clean(Link *link) {
3815 assert(link);
3816 assert(link->manager);
3817
3818 link_unref(set_remove(link->manager->dirty_links, link));
3819 }
3820
3821 static const char* const link_state_table[_LINK_STATE_MAX] = {
3822 [LINK_STATE_PENDING] = "pending",
3823 [LINK_STATE_INITIALIZED] = "initialized",
3824 [LINK_STATE_CONFIGURING] = "configuring",
3825 [LINK_STATE_CONFIGURED] = "configured",
3826 [LINK_STATE_UNMANAGED] = "unmanaged",
3827 [LINK_STATE_FAILED] = "failed",
3828 [LINK_STATE_LINGER] = "linger",
3829 };
3830
3831 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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