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Merge pull request #13365 from keszybz/fix-commits-from-pr-13246
[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, AddressFamily 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_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_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->neighbors = set_free_with_destructor(link->neighbors, neighbor_free);
703 link->neighbors_foreign = set_free_with_destructor(link->neighbors_foreign, neighbor_free);
704
705 link->addresses = set_free_with_destructor(link->addresses, address_free);
706 link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free);
707
708 while ((address = link->pool_addresses)) {
709 LIST_REMOVE(addresses, link->pool_addresses, address);
710 address_free(address);
711 }
712
713 sd_dhcp_server_unref(link->dhcp_server);
714 sd_dhcp_client_unref(link->dhcp_client);
715 sd_dhcp_lease_unref(link->dhcp_lease);
716 set_free(link->dhcp_routes);
717
718 link_lldp_emit_stop(link);
719
720 free(link->lease_file);
721
722 sd_lldp_unref(link->lldp);
723 free(link->lldp_file);
724
725 ndisc_flush(link);
726
727 sd_ipv4ll_unref(link->ipv4ll);
728 sd_dhcp6_client_unref(link->dhcp6_client);
729 sd_ndisc_unref(link->ndisc);
730 sd_radv_unref(link->radv);
731
732 free(link->ifname);
733 free(link->kind);
734
735 (void) unlink(link->state_file);
736 free(link->state_file);
737
738 sd_device_unref(link->sd_device);
739
740 hashmap_free(link->bound_to_links);
741 hashmap_free(link->bound_by_links);
742
743 set_free_with_destructor(link->slaves, link_unref);
744
745 network_unref(link->network);
746
747 return mfree(link);
748 }
749
750 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
751
752 int link_get(Manager *m, int ifindex, Link **ret) {
753 Link *link;
754
755 assert(m);
756 assert(ifindex);
757 assert(ret);
758
759 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
760 if (!link)
761 return -ENODEV;
762
763 *ret = link;
764
765 return 0;
766 }
767
768 void link_set_state(Link *link, LinkState state) {
769 assert(link);
770
771 if (link->state == state)
772 return;
773
774 log_link_debug(link, "State changed: %s -> %s",
775 link_state_to_string(link->state),
776 link_state_to_string(state));
777
778 link->state = state;
779
780 link_send_changed(link, "AdministrativeState", NULL);
781 }
782
783 static void link_enter_unmanaged(Link *link) {
784 assert(link);
785
786 link_set_state(link, LINK_STATE_UNMANAGED);
787
788 link_dirty(link);
789 }
790
791 int link_stop_clients(Link *link, bool may_keep_dhcp) {
792 int r = 0, k;
793
794 assert(link);
795 assert(link->manager);
796 assert(link->manager->event);
797
798 dhcp4_release_old_lease(link);
799
800 if (link->dhcp_client && (!may_keep_dhcp || !link->network ||
801 !FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP))) {
802 k = sd_dhcp_client_stop(link->dhcp_client);
803 if (k < 0)
804 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
805 }
806
807 if (link->ipv4ll) {
808 k = sd_ipv4ll_stop(link->ipv4ll);
809 if (k < 0)
810 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
811 }
812
813 if (link->dhcp6_client) {
814 k = sd_dhcp6_client_stop(link->dhcp6_client);
815 if (k < 0)
816 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
817 }
818
819 if (link->ndisc) {
820 k = sd_ndisc_stop(link->ndisc);
821 if (k < 0)
822 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
823 }
824
825 if (link->radv) {
826 k = sd_radv_stop(link->radv);
827 if (k < 0)
828 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
829 }
830
831 link_lldp_emit_stop(link);
832 return r;
833 }
834
835 void link_enter_failed(Link *link) {
836 assert(link);
837
838 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
839 return;
840
841 log_link_warning(link, "Failed");
842
843 link_set_state(link, LINK_STATE_FAILED);
844
845 link_stop_clients(link, false);
846
847 link_dirty(link);
848 }
849
850 static int link_join_netdevs_after_configured(Link *link) {
851 NetDev *netdev;
852 Iterator i;
853 int r;
854
855 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
856 if (netdev->ifindex > 0)
857 /* Assume already enslaved. */
858 continue;
859
860 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
861 continue;
862
863 log_struct(LOG_DEBUG,
864 LOG_LINK_INTERFACE(link),
865 LOG_NETDEV_INTERFACE(netdev),
866 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
867
868 r = netdev_join(netdev, link, NULL);
869 if (r < 0)
870 return log_struct_errno(LOG_WARNING, r,
871 LOG_LINK_INTERFACE(link),
872 LOG_NETDEV_INTERFACE(netdev),
873 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
874 }
875
876 return 0;
877 }
878
879 static void link_enter_configured(Link *link) {
880 assert(link);
881 assert(link->network);
882
883 if (link->state != LINK_STATE_CONFIGURING)
884 return;
885
886 log_link_info(link, "Configured");
887
888 link_set_state(link, LINK_STATE_CONFIGURED);
889
890 (void) link_join_netdevs_after_configured(link);
891
892 link_dirty(link);
893 }
894
895 static int link_request_set_routing_policy_rule(Link *link) {
896 RoutingPolicyRule *rule, *rrule = NULL;
897 int r;
898
899 assert(link);
900 assert(link->network);
901
902 link->routing_policy_rules_configured = false;
903
904 LIST_FOREACH(rules, rule, link->network->rules) {
905 r = routing_policy_rule_get(link->manager, rule, &rrule);
906 if (r >= 0) {
907 if (r == 0)
908 (void) routing_policy_rule_make_local(link->manager, rrule);
909 continue;
910 }
911
912 r = routing_policy_rule_configure(rule, link, NULL);
913 if (r < 0)
914 return log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
915 if (r > 0)
916 link->routing_policy_rule_messages++;
917 }
918
919 routing_policy_rule_purge(link->manager, link);
920 if (link->routing_policy_rule_messages == 0) {
921 link->routing_policy_rules_configured = true;
922 link_check_ready(link);
923 } else {
924 log_link_debug(link, "Setting routing policy rules");
925 link_set_state(link, LINK_STATE_CONFIGURING);
926 }
927
928 return 0;
929 }
930
931 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
932 int r;
933
934 assert(link);
935 assert(link->route_messages > 0);
936 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
937 LINK_STATE_FAILED, LINK_STATE_LINGER));
938
939 link->route_messages--;
940
941 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
942 return 1;
943
944 r = sd_netlink_message_get_errno(m);
945 if (r < 0 && r != -EEXIST) {
946 log_link_warning_errno(link, r, "Could not set route: %m");
947 link_enter_failed(link);
948 return 1;
949 }
950
951 if (link->route_messages == 0) {
952 log_link_debug(link, "Routes set");
953 link->static_routes_configured = true;
954 link_check_ready(link);
955 }
956
957 return 1;
958 }
959
960 int link_request_set_routes(Link *link) {
961 enum {
962 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
963 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
964 _PHASE_MAX
965 } phase;
966 Route *rt;
967 int r;
968
969 assert(link);
970 assert(link->network);
971 assert(link->addresses_configured);
972 assert(link->address_messages == 0);
973 assert(link->state != _LINK_STATE_INVALID);
974
975 link->static_routes_configured = false;
976
977 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
978 /* During configuring addresses, the link lost its carrier. As networkd is dropping
979 * the addresses now, let's not configure the routes either. */
980 return 0;
981
982 r = link_request_set_routing_policy_rule(link);
983 if (r < 0)
984 return r;
985
986 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
987 for (phase = 0; phase < _PHASE_MAX; phase++)
988 LIST_FOREACH(routes, rt, link->network->static_routes) {
989
990 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
991 continue;
992
993 r = route_configure(rt, link, route_handler);
994 if (r < 0)
995 return log_link_warning_errno(link, r, "Could not set routes: %m");
996 if (r > 0)
997 link->route_messages++;
998 }
999
1000 if (link->route_messages == 0) {
1001 link->static_routes_configured = true;
1002 link_check_ready(link);
1003 } else {
1004 log_link_debug(link, "Setting routes");
1005 link_set_state(link, LINK_STATE_CONFIGURING);
1006 }
1007
1008 return 0;
1009 }
1010
1011 void link_check_ready(Link *link) {
1012 Address *a;
1013 Iterator i;
1014 int r;
1015
1016 assert(link);
1017
1018 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1019 return;
1020
1021 if (!link->network)
1022 return;
1023
1024 if (!link->addresses_configured)
1025 return;
1026
1027 if (!link->neighbors_configured)
1028 return;
1029
1030 SET_FOREACH(a, link->addresses, i)
1031 if (!address_is_ready(a))
1032 return;
1033
1034 if (!link->addresses_ready) {
1035 link->addresses_ready = true;
1036 r = link_request_set_routes(link);
1037 if (r < 0)
1038 link_enter_failed(link);
1039 return;
1040 }
1041
1042 if (!link->static_routes_configured)
1043 return;
1044
1045 if (!link->routing_policy_rules_configured)
1046 return;
1047
1048 if (link_has_carrier(link) || !link->network->configure_without_carrier) {
1049
1050 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !(link->ipv4ll_address && link->ipv4ll_route))
1051 return;
1052
1053 if (link_ipv6ll_enabled(link) &&
1054 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
1055 return;
1056
1057 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
1058 !link->dhcp4_configured &&
1059 !link->dhcp6_configured &&
1060 !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address && link->ipv4ll_route))
1061 /* When DHCP is enabled, at least one protocol must provide an address, or
1062 * an IPv4ll fallback address must be configured. */
1063 return;
1064
1065 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
1066 return;
1067 }
1068
1069 if (link->state != LINK_STATE_CONFIGURED)
1070 link_enter_configured(link);
1071
1072 return;
1073 }
1074
1075 static int link_request_set_neighbors(Link *link) {
1076 Neighbor *neighbor;
1077 int r;
1078
1079 assert(link);
1080 assert(link->network);
1081 assert(link->state != _LINK_STATE_INVALID);
1082
1083 link->neighbors_configured = false;
1084
1085 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1086 r = neighbor_configure(neighbor, link, NULL);
1087 if (r < 0)
1088 return log_link_warning_errno(link, r, "Could not set neighbor: %m");
1089 }
1090
1091 if (link->neighbor_messages == 0) {
1092 link->neighbors_configured = true;
1093 link_check_ready(link);
1094 } else {
1095 log_link_debug(link, "Setting neighbors");
1096 link_set_state(link, LINK_STATE_CONFIGURING);
1097 }
1098
1099 return 0;
1100 }
1101
1102 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1103 int r;
1104
1105 assert(rtnl);
1106 assert(m);
1107 assert(link);
1108 assert(link->ifname);
1109 assert(link->address_messages > 0);
1110 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1111 LINK_STATE_FAILED, LINK_STATE_LINGER));
1112
1113 link->address_messages--;
1114
1115 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1116 return 1;
1117
1118 r = sd_netlink_message_get_errno(m);
1119 if (r < 0 && r != -EEXIST) {
1120 log_link_warning_errno(link, r, "could not set address: %m");
1121 link_enter_failed(link);
1122 return 1;
1123 } else if (r >= 0)
1124 (void) manager_rtnl_process_address(rtnl, m, link->manager);
1125
1126 if (link->address_messages == 0) {
1127 log_link_debug(link, "Addresses set");
1128 link->addresses_configured = true;
1129 link_check_ready(link);
1130 }
1131
1132 return 1;
1133 }
1134
1135 static int link_set_bridge_fdb(Link *link) {
1136 FdbEntry *fdb_entry;
1137 int r;
1138
1139 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1140 r = fdb_entry_configure(link, fdb_entry);
1141 if (r < 0)
1142 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1143 }
1144
1145 return 0;
1146 }
1147
1148 static int link_request_set_addresses(Link *link) {
1149 AddressLabel *label;
1150 Address *ad;
1151 int r;
1152
1153 assert(link);
1154 assert(link->network);
1155 assert(link->state != _LINK_STATE_INVALID);
1156
1157 /* Reset all *_configured flags we are configuring. */
1158 link->addresses_configured = false;
1159 link->addresses_ready = false;
1160 link->neighbors_configured = false;
1161 link->static_routes_configured = false;
1162 link->routing_policy_rules_configured = false;
1163
1164 r = link_set_bridge_fdb(link);
1165 if (r < 0)
1166 return r;
1167
1168 r = link_request_set_neighbors(link);
1169 if (r < 0)
1170 return r;
1171
1172 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1173 bool update;
1174
1175 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1176
1177 r = address_configure(ad, link, address_handler, update);
1178 if (r < 0)
1179 return log_link_warning_errno(link, r, "Could not set addresses: %m");
1180 if (r > 0)
1181 link->address_messages++;
1182 }
1183
1184 LIST_FOREACH(labels, label, link->network->address_labels) {
1185 r = address_label_configure(label, link, NULL, false);
1186 if (r < 0)
1187 return log_link_warning_errno(link, r, "Could not set address label: %m");
1188
1189 link->address_label_messages++;
1190 }
1191
1192 /* now that we can figure out a default address for the dhcp server,
1193 start it */
1194 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1195 r = dhcp4_server_configure(link);
1196 if (r < 0)
1197 return r;
1198 log_link_debug(link, "Offering DHCPv4 leases");
1199 }
1200
1201 if (link->address_messages == 0) {
1202 link->addresses_configured = true;
1203 link_check_ready(link);
1204 } else {
1205 log_link_debug(link, "Setting addresses");
1206 link_set_state(link, LINK_STATE_CONFIGURING);
1207 }
1208
1209 return 0;
1210 }
1211
1212 static int link_set_bridge_vlan(Link *link) {
1213 int r;
1214
1215 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1216 if (r < 0)
1217 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1218
1219 return r;
1220 }
1221
1222 static int link_set_proxy_arp(Link *link) {
1223 int r;
1224
1225 if (!link_proxy_arp_enabled(link))
1226 return 0;
1227
1228 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1229 if (r < 0)
1230 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1231
1232 return 0;
1233 }
1234
1235 static int link_configure_after_setting_mtu(Link *link);
1236
1237 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1238 int r;
1239
1240 assert(m);
1241 assert(link);
1242 assert(link->ifname);
1243
1244 link->setting_mtu = false;
1245
1246 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1247 return 1;
1248
1249 r = sd_netlink_message_get_errno(m);
1250 if (r < 0)
1251 log_link_warning_errno(link, r, "Could not set MTU, ignoring: %m");
1252 else
1253 log_link_debug(link, "Setting MTU done.");
1254
1255 if (link->state == LINK_STATE_INITIALIZED) {
1256 r = link_configure_after_setting_mtu(link);
1257 if (r < 0)
1258 link_enter_failed(link);
1259 }
1260
1261 return 1;
1262 }
1263
1264 int link_set_mtu(Link *link, uint32_t mtu) {
1265 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1266 int r;
1267
1268 assert(link);
1269 assert(link->manager);
1270 assert(link->manager->rtnl);
1271
1272 if (mtu == 0 || link->setting_mtu)
1273 return 0;
1274
1275 if (link->mtu == mtu)
1276 return 0;
1277
1278 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1279
1280 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1281 if (r < 0)
1282 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1283
1284 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1285 * for this interface, then disable IPv6 else enable it. */
1286 (void) link_enable_ipv6(link);
1287
1288 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1289 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1290 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1291
1292 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1293 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1294
1295 mtu = IPV6_MIN_MTU;
1296 }
1297
1298 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1299 if (r < 0)
1300 return log_link_error_errno(link, r, "Could not append MTU: %m");
1301
1302 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1303 link_netlink_destroy_callback, link);
1304 if (r < 0)
1305 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1306
1307 link_ref(link);
1308 link->setting_mtu = true;
1309
1310 return 0;
1311 }
1312
1313 static bool link_reduces_vlan_mtu(Link *link) {
1314 /* See netif_reduces_vlan_mtu() in kernel. */
1315 return streq_ptr(link->kind, "macsec");
1316 }
1317
1318 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1319 uint32_t mtu = 0;
1320 NetDev *dev;
1321 Iterator i;
1322
1323 HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1324 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1325 /* See vlan_dev_change_mtu() in kernel. */
1326 mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1327
1328 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1329 /* See macvlan_change_mtu() in kernel. */
1330 mtu = dev->mtu;
1331
1332 return mtu;
1333 }
1334
1335 static int link_configure_mtu(Link *link) {
1336 uint32_t mtu;
1337
1338 assert(link);
1339 assert(link->network);
1340
1341 if (link->network->mtu > 0)
1342 return link_set_mtu(link, link->network->mtu);
1343
1344 mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1345 if (link->mtu >= mtu)
1346 return 0;
1347
1348 log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1349 "If it is not desired, then please explicitly specify MTUBytes= setting.",
1350 link->mtu, mtu);
1351
1352 return link_set_mtu(link, mtu);
1353 }
1354
1355 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1356 int r;
1357
1358 assert(m);
1359 assert(link);
1360 assert(link->ifname);
1361
1362 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1363 return 1;
1364
1365 r = sd_netlink_message_get_errno(m);
1366 if (r < 0)
1367 log_link_warning_errno(link, r, "Could not set link flags, ignoring: %m");
1368
1369 return 1;
1370 }
1371
1372 static int link_set_flags(Link *link) {
1373 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1374 unsigned ifi_change = 0;
1375 unsigned ifi_flags = 0;
1376 int r;
1377
1378 assert(link);
1379 assert(link->manager);
1380 assert(link->manager->rtnl);
1381
1382 if (link->flags & IFF_LOOPBACK)
1383 return 0;
1384
1385 if (!link->network)
1386 return 0;
1387
1388 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1389 return 0;
1390
1391 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1392 if (r < 0)
1393 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1394
1395 if (link->network->arp >= 0) {
1396 ifi_change |= IFF_NOARP;
1397 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1398 }
1399
1400 if (link->network->multicast >= 0) {
1401 ifi_change |= IFF_MULTICAST;
1402 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1403 }
1404
1405 if (link->network->allmulticast >= 0) {
1406 ifi_change |= IFF_ALLMULTI;
1407 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1408 }
1409
1410 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1411 if (r < 0)
1412 return log_link_error_errno(link, r, "Could not set link flags: %m");
1413
1414 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1415 link_netlink_destroy_callback, link);
1416 if (r < 0)
1417 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1418
1419 link_ref(link);
1420
1421 return 0;
1422 }
1423
1424 static int link_acquire_ipv6_conf(Link *link) {
1425 int r;
1426
1427 assert(link);
1428
1429 if (link_ipv6_accept_ra_enabled(link)) {
1430 assert(link->ndisc);
1431
1432 log_link_debug(link, "Discovering IPv6 routers");
1433
1434 r = sd_ndisc_start(link->ndisc);
1435 if (r < 0 && r != -EBUSY)
1436 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1437 }
1438
1439 if (link_radv_enabled(link)) {
1440 assert(link->radv);
1441 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1442
1443 log_link_debug(link, "Starting IPv6 Router Advertisements");
1444
1445 r = sd_radv_start(link->radv);
1446 if (r < 0 && r != -EBUSY)
1447 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1448 }
1449
1450 (void) dhcp6_request_prefix_delegation(link);
1451
1452 return 0;
1453 }
1454
1455 static int link_acquire_ipv4_conf(Link *link) {
1456 int r;
1457
1458 assert(link);
1459 assert(link->manager);
1460 assert(link->manager->event);
1461
1462 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1463 assert(link->ipv4ll);
1464
1465 log_link_debug(link, "Acquiring IPv4 link-local address");
1466
1467 r = sd_ipv4ll_start(link->ipv4ll);
1468 if (r < 0)
1469 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1470 }
1471
1472 if (link_dhcp4_enabled(link)) {
1473 assert(link->dhcp_client);
1474
1475 log_link_debug(link, "Acquiring DHCPv4 lease");
1476
1477 r = sd_dhcp_client_start(link->dhcp_client);
1478 if (r < 0)
1479 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1480 }
1481
1482 return 0;
1483 }
1484
1485 static int link_acquire_conf(Link *link) {
1486 int r;
1487
1488 assert(link);
1489
1490 r = link_acquire_ipv4_conf(link);
1491 if (r < 0)
1492 return r;
1493
1494 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1495 r = link_acquire_ipv6_conf(link);
1496 if (r < 0)
1497 return r;
1498 }
1499
1500 if (link_lldp_emit_enabled(link)) {
1501 r = link_lldp_emit_start(link);
1502 if (r < 0)
1503 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1504 }
1505
1506 return 0;
1507 }
1508
1509 bool link_has_carrier(Link *link) {
1510 /* see Documentation/networking/operstates.txt in the kernel sources */
1511
1512 if (link->kernel_operstate == IF_OPER_UP)
1513 return true;
1514
1515 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1516 /* operstate may not be implemented, so fall back to flags */
1517 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1518 !FLAGS_SET(link->flags, IFF_DORMANT))
1519 return true;
1520
1521 return false;
1522 }
1523
1524 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1525 int r;
1526
1527 assert(link);
1528
1529 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1530 return 1;
1531
1532 r = sd_netlink_message_get_errno(m);
1533 if (r < 0)
1534 log_link_warning_errno(link, r, "Could not set address genmode for interface, ignoring: %m");
1535
1536 return 1;
1537 }
1538
1539 static int link_configure_addrgen_mode(Link *link) {
1540 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1541 uint8_t ipv6ll_mode;
1542 int r;
1543
1544 assert(link);
1545 assert(link->network);
1546 assert(link->manager);
1547 assert(link->manager->rtnl);
1548
1549 if (!socket_ipv6_is_supported())
1550 return 0;
1551
1552 log_link_debug(link, "Setting address genmode for link");
1553
1554 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1555 if (r < 0)
1556 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1557
1558 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1559 if (r < 0)
1560 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1561
1562 r = sd_netlink_message_open_container(req, AF_INET6);
1563 if (r < 0)
1564 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1565
1566 if (!link_ipv6ll_enabled(link))
1567 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1568 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1569 /* The file may not exist. And event if it exists, when stable_secret is unset,
1570 * reading the file fails with EIO. */
1571 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1572 else
1573 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1574
1575 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1576 if (r < 0)
1577 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1578
1579 r = sd_netlink_message_close_container(req);
1580 if (r < 0)
1581 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1582
1583 r = sd_netlink_message_close_container(req);
1584 if (r < 0)
1585 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1586
1587 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1588 link_netlink_destroy_callback, link);
1589 if (r < 0)
1590 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1591
1592 link_ref(link);
1593
1594 return 0;
1595 }
1596
1597 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1598 int r;
1599
1600 assert(link);
1601
1602 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1603 return 1;
1604
1605 r = sd_netlink_message_get_errno(m);
1606 if (r < 0)
1607 /* we warn but don't fail the link, as it may be brought up later */
1608 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1609
1610 return 1;
1611 }
1612
1613 static int link_up(Link *link) {
1614 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1615 int r;
1616
1617 assert(link);
1618 assert(link->network);
1619 assert(link->manager);
1620 assert(link->manager->rtnl);
1621
1622 log_link_debug(link, "Bringing link up");
1623
1624 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1625 if (r < 0)
1626 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1627
1628 /* set it free if not enslaved with networkd */
1629 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1630 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1631 if (r < 0)
1632 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1633 }
1634
1635 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1636 if (r < 0)
1637 return log_link_error_errno(link, r, "Could not set link flags: %m");
1638
1639 if (link->network->mac) {
1640 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1641 if (r < 0)
1642 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1643 }
1644
1645 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1646 link_netlink_destroy_callback, link);
1647 if (r < 0)
1648 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1649
1650 link_ref(link);
1651
1652 return 0;
1653 }
1654
1655 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1656 int r;
1657
1658 assert(link);
1659
1660 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1661 return 1;
1662
1663 r = sd_netlink_message_get_errno(m);
1664 if (r < 0)
1665 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1666
1667 return 1;
1668 }
1669
1670 int link_down(Link *link, link_netlink_message_handler_t callback) {
1671 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1672 int r;
1673
1674 assert(link);
1675 assert(link->manager);
1676 assert(link->manager->rtnl);
1677
1678 log_link_debug(link, "Bringing link down");
1679
1680 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1681 RTM_SETLINK, link->ifindex);
1682 if (r < 0)
1683 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1684
1685 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1686 if (r < 0)
1687 return log_link_error_errno(link, r, "Could not set link flags: %m");
1688
1689 r = netlink_call_async(link->manager->rtnl, NULL, req,
1690 callback ?: link_down_handler,
1691 link_netlink_destroy_callback, link);
1692 if (r < 0)
1693 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1694
1695 link_ref(link);
1696
1697 return 0;
1698 }
1699
1700 static int link_handle_bound_to_list(Link *link) {
1701 Link *l;
1702 Iterator i;
1703 int r;
1704 bool required_up = false;
1705 bool link_is_up = false;
1706
1707 assert(link);
1708
1709 if (hashmap_isempty(link->bound_to_links))
1710 return 0;
1711
1712 if (link->flags & IFF_UP)
1713 link_is_up = true;
1714
1715 HASHMAP_FOREACH (l, link->bound_to_links, i)
1716 if (link_has_carrier(l)) {
1717 required_up = true;
1718 break;
1719 }
1720
1721 if (!required_up && link_is_up) {
1722 r = link_down(link, NULL);
1723 if (r < 0)
1724 return r;
1725 } else if (required_up && !link_is_up) {
1726 r = link_up(link);
1727 if (r < 0)
1728 return r;
1729 }
1730
1731 return 0;
1732 }
1733
1734 static int link_handle_bound_by_list(Link *link) {
1735 Iterator i;
1736 Link *l;
1737 int r;
1738
1739 assert(link);
1740
1741 if (hashmap_isempty(link->bound_by_links))
1742 return 0;
1743
1744 HASHMAP_FOREACH (l, link->bound_by_links, i) {
1745 r = link_handle_bound_to_list(l);
1746 if (r < 0)
1747 return r;
1748 }
1749
1750 return 0;
1751 }
1752
1753 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1754 int r;
1755
1756 assert(link);
1757 assert(carrier);
1758
1759 if (link == carrier)
1760 return 0;
1761
1762 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1763 return 0;
1764
1765 r = hashmap_ensure_allocated(h, NULL);
1766 if (r < 0)
1767 return r;
1768
1769 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1770 if (r < 0)
1771 return r;
1772
1773 return 0;
1774 }
1775
1776 static int link_new_bound_by_list(Link *link) {
1777 Manager *m;
1778 Link *carrier;
1779 Iterator i;
1780 int r;
1781 bool list_updated = false;
1782
1783 assert(link);
1784 assert(link->manager);
1785
1786 m = link->manager;
1787
1788 HASHMAP_FOREACH(carrier, m->links, i) {
1789 if (!carrier->network)
1790 continue;
1791
1792 if (strv_isempty(carrier->network->bind_carrier))
1793 continue;
1794
1795 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
1796 r = link_put_carrier(link, carrier, &link->bound_by_links);
1797 if (r < 0)
1798 return r;
1799
1800 list_updated = true;
1801 }
1802 }
1803
1804 if (list_updated)
1805 link_dirty(link);
1806
1807 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
1808 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1809 if (r < 0)
1810 return r;
1811
1812 link_dirty(carrier);
1813 }
1814
1815 return 0;
1816 }
1817
1818 static int link_new_bound_to_list(Link *link) {
1819 Manager *m;
1820 Link *carrier;
1821 Iterator i;
1822 int r;
1823 bool list_updated = false;
1824
1825 assert(link);
1826 assert(link->manager);
1827
1828 if (!link->network)
1829 return 0;
1830
1831 if (strv_isempty(link->network->bind_carrier))
1832 return 0;
1833
1834 m = link->manager;
1835
1836 HASHMAP_FOREACH (carrier, m->links, i) {
1837 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
1838 r = link_put_carrier(link, carrier, &link->bound_to_links);
1839 if (r < 0)
1840 return r;
1841
1842 list_updated = true;
1843 }
1844 }
1845
1846 if (list_updated)
1847 link_dirty(link);
1848
1849 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
1850 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
1851 if (r < 0)
1852 return r;
1853
1854 link_dirty(carrier);
1855 }
1856
1857 return 0;
1858 }
1859
1860 static int link_new_carrier_maps(Link *link) {
1861 int r;
1862
1863 r = link_new_bound_by_list(link);
1864 if (r < 0)
1865 return r;
1866
1867 r = link_handle_bound_by_list(link);
1868 if (r < 0)
1869 return r;
1870
1871 r = link_new_bound_to_list(link);
1872 if (r < 0)
1873 return r;
1874
1875 r = link_handle_bound_to_list(link);
1876 if (r < 0)
1877 return r;
1878
1879 return 0;
1880 }
1881
1882 static void link_free_bound_to_list(Link *link) {
1883 Link *bound_to;
1884 Iterator i;
1885
1886 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
1887 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
1888
1889 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
1890 link_dirty(bound_to);
1891 }
1892
1893 return;
1894 }
1895
1896 static void link_free_bound_by_list(Link *link) {
1897 Link *bound_by;
1898 Iterator i;
1899
1900 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
1901 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
1902
1903 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
1904 link_dirty(bound_by);
1905 link_handle_bound_to_list(bound_by);
1906 }
1907 }
1908
1909 return;
1910 }
1911
1912 static void link_free_carrier_maps(Link *link) {
1913 bool list_updated = false;
1914
1915 assert(link);
1916
1917 if (!hashmap_isempty(link->bound_to_links)) {
1918 link_free_bound_to_list(link);
1919 list_updated = true;
1920 }
1921
1922 if (!hashmap_isempty(link->bound_by_links)) {
1923 link_free_bound_by_list(link);
1924 list_updated = true;
1925 }
1926
1927 if (list_updated)
1928 link_dirty(link);
1929
1930 return;
1931 }
1932
1933 static int link_append_to_master(Link *link, NetDev *netdev) {
1934 Link *master;
1935 int r;
1936
1937 assert(link);
1938 assert(netdev);
1939
1940 r = link_get(link->manager, netdev->ifindex, &master);
1941 if (r < 0)
1942 return r;
1943
1944 r = set_ensure_allocated(&master->slaves, NULL);
1945 if (r < 0)
1946 return r;
1947
1948 r = set_put(master->slaves, link);
1949 if (r < 0)
1950 return r;
1951 if (r == 0)
1952 return 0;
1953
1954 link_ref(link);
1955 return 0;
1956 }
1957
1958 static void link_drop_from_master(Link *link, NetDev *netdev) {
1959 Link *master;
1960
1961 assert(link);
1962
1963 if (!link->manager || !netdev)
1964 return;
1965
1966 if (link_get(link->manager, netdev->ifindex, &master) < 0)
1967 return;
1968
1969 link_unref(set_remove(master->slaves, link));
1970 }
1971
1972 static void link_detach_from_manager(Link *link) {
1973 if (!link || !link->manager)
1974 return;
1975
1976 link_unref(set_remove(link->manager->links_requesting_uuid, link));
1977 link_clean(link);
1978
1979 /* The following must be called at last. */
1980 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
1981 link_unref(link);
1982 }
1983
1984 void link_drop(Link *link) {
1985 if (!link || link->state == LINK_STATE_LINGER)
1986 return;
1987
1988 link_set_state(link, LINK_STATE_LINGER);
1989
1990 link_free_carrier_maps(link);
1991
1992 if (link->network) {
1993 link_drop_from_master(link, link->network->bridge);
1994 link_drop_from_master(link, link->network->bond);
1995 }
1996
1997 log_link_debug(link, "Link removed");
1998
1999 (void) unlink(link->state_file);
2000 link_detach_from_manager(link);
2001 }
2002
2003 static int link_joined(Link *link) {
2004 int r;
2005
2006 assert(link);
2007 assert(link->network);
2008
2009 if (!hashmap_isempty(link->bound_to_links)) {
2010 r = link_handle_bound_to_list(link);
2011 if (r < 0)
2012 return r;
2013 } else if (!(link->flags & IFF_UP)) {
2014 r = link_up(link);
2015 if (r < 0) {
2016 link_enter_failed(link);
2017 return r;
2018 }
2019 }
2020
2021 if (link->network->bridge) {
2022 r = link_set_bridge(link);
2023 if (r < 0)
2024 log_link_error_errno(link, r, "Could not set bridge message: %m");
2025
2026 r = link_append_to_master(link, link->network->bridge);
2027 if (r < 0)
2028 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2029 }
2030
2031 if (link->network->bond) {
2032 r = link_set_bond(link);
2033 if (r < 0)
2034 log_link_error_errno(link, r, "Could not set bond message: %m");
2035
2036 r = link_append_to_master(link, link->network->bond);
2037 if (r < 0)
2038 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2039 }
2040
2041 if (link->network->use_br_vlan &&
2042 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2043 r = link_set_bridge_vlan(link);
2044 if (r < 0)
2045 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2046 }
2047
2048 /* Skip setting up addresses until it gets carrier,
2049 or it would try to set addresses twice,
2050 which is bad for non-idempotent steps. */
2051 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2052 return 0;
2053
2054 link_set_state(link, LINK_STATE_CONFIGURING);
2055 return link_request_set_addresses(link);
2056 }
2057
2058 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2059 int r;
2060
2061 assert(link);
2062 assert(link->network);
2063 assert(link->enslaving > 0);
2064
2065 link->enslaving--;
2066
2067 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2068 return 1;
2069
2070 r = sd_netlink_message_get_errno(m);
2071 if (r < 0 && r != -EEXIST) {
2072 log_link_error_errno(link, r, "Could not join netdev: %m");
2073 link_enter_failed(link);
2074 return 1;
2075 }
2076
2077 log_link_debug(link, "Joined netdev");
2078
2079 if (link->enslaving == 0) {
2080 r = link_joined(link);
2081 if (r < 0)
2082 link_enter_failed(link);
2083 }
2084
2085 return 1;
2086 }
2087
2088 static int link_enter_join_netdev(Link *link) {
2089 NetDev *netdev;
2090 Iterator i;
2091 int r;
2092
2093 assert(link);
2094 assert(link->network);
2095 assert(link->state == LINK_STATE_INITIALIZED);
2096
2097 link_set_state(link, LINK_STATE_CONFIGURING);
2098
2099 link_dirty(link);
2100 link->enslaving = 0;
2101
2102 if (link->network->bond) {
2103 if (link->network->bond->state == NETDEV_STATE_READY &&
2104 link->network->bond->ifindex == link->master_ifindex)
2105 return link_joined(link);
2106
2107 log_struct(LOG_DEBUG,
2108 LOG_LINK_INTERFACE(link),
2109 LOG_NETDEV_INTERFACE(link->network->bond),
2110 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2111
2112 link->enslaving++;
2113
2114 r = netdev_join(link->network->bond, link, netdev_join_handler);
2115 if (r < 0) {
2116 log_struct_errno(LOG_WARNING, r,
2117 LOG_LINK_INTERFACE(link),
2118 LOG_NETDEV_INTERFACE(link->network->bond),
2119 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2120 link_enter_failed(link);
2121 return r;
2122 }
2123 }
2124
2125 if (link->network->bridge) {
2126 log_struct(LOG_DEBUG,
2127 LOG_LINK_INTERFACE(link),
2128 LOG_NETDEV_INTERFACE(link->network->bridge),
2129 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2130
2131 link->enslaving++;
2132
2133 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2134 if (r < 0) {
2135 log_struct_errno(LOG_WARNING, r,
2136 LOG_LINK_INTERFACE(link),
2137 LOG_NETDEV_INTERFACE(link->network->bridge),
2138 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2139 link_enter_failed(link);
2140 return r;
2141 }
2142 }
2143
2144 if (link->network->vrf) {
2145 log_struct(LOG_DEBUG,
2146 LOG_LINK_INTERFACE(link),
2147 LOG_NETDEV_INTERFACE(link->network->vrf),
2148 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2149
2150 link->enslaving++;
2151
2152 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2153 if (r < 0) {
2154 log_struct_errno(LOG_WARNING, r,
2155 LOG_LINK_INTERFACE(link),
2156 LOG_NETDEV_INTERFACE(link->network->vrf),
2157 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2158 link_enter_failed(link);
2159 return r;
2160 }
2161 }
2162
2163 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2164
2165 if (netdev->ifindex > 0)
2166 /* Assume already enslaved. */
2167 continue;
2168
2169 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2170 continue;
2171
2172 log_struct(LOG_DEBUG,
2173 LOG_LINK_INTERFACE(link),
2174 LOG_NETDEV_INTERFACE(netdev),
2175 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2176
2177 link->enslaving++;
2178
2179 r = netdev_join(netdev, link, netdev_join_handler);
2180 if (r < 0) {
2181 log_struct_errno(LOG_WARNING, r,
2182 LOG_LINK_INTERFACE(link),
2183 LOG_NETDEV_INTERFACE(netdev),
2184 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2185 link_enter_failed(link);
2186 return r;
2187 }
2188 }
2189
2190 if (link->enslaving == 0)
2191 return link_joined(link);
2192
2193 return 0;
2194 }
2195
2196 static int link_set_ipv4_forward(Link *link) {
2197 int r;
2198
2199 if (!link_ipv4_forward_enabled(link))
2200 return 0;
2201
2202 /* We propagate the forwarding flag from one interface to the
2203 * global setting one way. This means: as long as at least one
2204 * interface was configured at any time that had IP forwarding
2205 * enabled the setting will stay on for good. We do this
2206 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2207 * somewhat in sync (see below). */
2208
2209 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2210 if (r < 0)
2211 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2212
2213 return 0;
2214 }
2215
2216 static int link_set_ipv6_forward(Link *link) {
2217 int r;
2218
2219 if (!link_ipv6_forward_enabled(link))
2220 return 0;
2221
2222 /* On Linux, the IPv6 stack does not know a per-interface
2223 * packet forwarding setting: either packet forwarding is on
2224 * for all, or off for all. We hence don't bother with a
2225 * per-interface setting, but simply propagate the interface
2226 * flag, if it is set, to the global flag, one-way. Note that
2227 * while IPv4 would allow a per-interface flag, we expose the
2228 * same behaviour there and also propagate the setting from
2229 * one to all, to keep things simple (see above). */
2230
2231 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2232 if (r < 0)
2233 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2234
2235 return 0;
2236 }
2237
2238 static int link_set_ipv6_privacy_extensions(Link *link) {
2239 IPv6PrivacyExtensions s;
2240 int r;
2241
2242 s = link_ipv6_privacy_extensions(link);
2243 if (s < 0)
2244 return 0;
2245
2246 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2247 if (r < 0)
2248 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2249
2250 return 0;
2251 }
2252
2253 static int link_set_ipv6_accept_ra(Link *link) {
2254 int r;
2255
2256 /* Make this a NOP if IPv6 is not available */
2257 if (!socket_ipv6_is_supported())
2258 return 0;
2259
2260 if (link->flags & IFF_LOOPBACK)
2261 return 0;
2262
2263 if (!link->network)
2264 return 0;
2265
2266 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2267 if (r < 0)
2268 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2269
2270 return 0;
2271 }
2272
2273 static int link_set_ipv6_dad_transmits(Link *link) {
2274 int r;
2275
2276 /* Make this a NOP if IPv6 is not available */
2277 if (!socket_ipv6_is_supported())
2278 return 0;
2279
2280 if (link->flags & IFF_LOOPBACK)
2281 return 0;
2282
2283 if (!link->network)
2284 return 0;
2285
2286 if (link->network->ipv6_dad_transmits < 0)
2287 return 0;
2288
2289 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2290 if (r < 0)
2291 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2292
2293 return 0;
2294 }
2295
2296 static int link_set_ipv6_hop_limit(Link *link) {
2297 int r;
2298
2299 /* Make this a NOP if IPv6 is not available */
2300 if (!socket_ipv6_is_supported())
2301 return 0;
2302
2303 if (link->flags & IFF_LOOPBACK)
2304 return 0;
2305
2306 if (!link->network)
2307 return 0;
2308
2309 if (link->network->ipv6_hop_limit < 0)
2310 return 0;
2311
2312 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2313 if (r < 0)
2314 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2315
2316 return 0;
2317 }
2318
2319 static int link_set_ipv6_mtu(Link *link) {
2320 int r;
2321
2322 /* Make this a NOP if IPv6 is not available */
2323 if (!socket_ipv6_is_supported())
2324 return 0;
2325
2326 if (link->flags & IFF_LOOPBACK)
2327 return 0;
2328
2329 if (link->network->ipv6_mtu == 0)
2330 return 0;
2331
2332 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2333 if (r < 0)
2334 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2335
2336 return 0;
2337 }
2338
2339 static bool link_is_static_address_configured(Link *link, Address *address) {
2340 Address *net_address;
2341
2342 assert(link);
2343 assert(address);
2344
2345 if (!link->network)
2346 return false;
2347
2348 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2349 if (address_equal(net_address, address))
2350 return true;
2351
2352 return false;
2353 }
2354
2355 static bool link_is_neighbor_configured(Link *link, Neighbor *neighbor) {
2356 Neighbor *net_neighbor;
2357
2358 assert(link);
2359 assert(neighbor);
2360
2361 if (!link->network)
2362 return false;
2363
2364 LIST_FOREACH(neighbors, net_neighbor, link->network->neighbors)
2365 if (neighbor_equal(net_neighbor, neighbor))
2366 return true;
2367
2368 return false;
2369 }
2370
2371 static bool link_is_static_route_configured(Link *link, Route *route) {
2372 Route *net_route;
2373
2374 assert(link);
2375 assert(route);
2376
2377 if (!link->network)
2378 return false;
2379
2380 LIST_FOREACH(routes, net_route, link->network->static_routes)
2381 if (route_equal(net_route, route))
2382 return true;
2383
2384 return false;
2385 }
2386
2387 static bool link_address_is_dynamic(Link *link, Address *address) {
2388 Route *route;
2389 Iterator i;
2390
2391 assert(link);
2392 assert(address);
2393
2394 if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2395 return true;
2396
2397 /* Even when the address is leased from a DHCP server, networkd assign the address
2398 * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2399 * corresponding routes with RTPROT_DHCP. */
2400 SET_FOREACH(route, link->routes_foreign, i) {
2401 if (route->protocol != RTPROT_DHCP)
2402 continue;
2403
2404 if (address->family != route->family)
2405 continue;
2406
2407 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2408 return true;
2409 }
2410
2411 return false;
2412 }
2413
2414 static int link_drop_foreign_config(Link *link) {
2415 Address *address;
2416 Neighbor *neighbor;
2417 Route *route;
2418 Iterator i;
2419 int r;
2420
2421 SET_FOREACH(address, link->addresses_foreign, i) {
2422 /* we consider IPv6LL addresses to be managed by the kernel */
2423 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2424 continue;
2425
2426 if (link_address_is_dynamic(link, address)) {
2427 if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2428 continue;
2429 } else if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2430 continue;
2431
2432 if (link_is_static_address_configured(link, address)) {
2433 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2434 if (r < 0)
2435 return log_link_error_errno(link, r, "Failed to add address: %m");
2436 } else {
2437 r = address_remove(address, link, NULL);
2438 if (r < 0)
2439 return r;
2440 }
2441 }
2442
2443 SET_FOREACH(neighbor, link->neighbors_foreign, i) {
2444 if (link_is_neighbor_configured(link, neighbor)) {
2445 r = neighbor_add(link, neighbor->family, &neighbor->in_addr, &neighbor->lladdr, neighbor->lladdr_size, NULL);
2446 if (r < 0)
2447 return r;
2448 } else {
2449 r = neighbor_remove(neighbor, link, NULL);
2450 if (r < 0)
2451 return r;
2452 }
2453 }
2454
2455 SET_FOREACH(route, link->routes_foreign, i) {
2456 /* do not touch routes managed by the kernel */
2457 if (route->protocol == RTPROT_KERNEL)
2458 continue;
2459
2460 /* do not touch multicast route added by kernel */
2461 /* FIXME: Why the kernel adds this route with protocol RTPROT_BOOT??? We need to investigate that.
2462 * https://tools.ietf.org/html/rfc4862#section-5.4 may explain why. */
2463 if (route->protocol == RTPROT_BOOT &&
2464 route->family == AF_INET6 &&
2465 route->dst_prefixlen == 8 &&
2466 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 }}} }))
2467 continue;
2468
2469 if (route->protocol == RTPROT_STATIC &&
2470 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2471 continue;
2472
2473 if (route->protocol == RTPROT_DHCP &&
2474 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2475 continue;
2476
2477 if (link_is_static_route_configured(link, route)) {
2478 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, &route->gw, route->tos, route->priority, route->table, NULL);
2479 if (r < 0)
2480 return r;
2481 } else {
2482 r = route_remove(route, link, NULL);
2483 if (r < 0)
2484 return r;
2485 }
2486 }
2487
2488 return 0;
2489 }
2490
2491 static int link_drop_config(Link *link) {
2492 Address *address, *pool_address;
2493 Neighbor *neighbor;
2494 Route *route;
2495 Iterator i;
2496 int r;
2497
2498 SET_FOREACH(address, link->addresses, i) {
2499 /* we consider IPv6LL addresses to be managed by the kernel */
2500 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2501 continue;
2502
2503 r = address_remove(address, link, NULL);
2504 if (r < 0)
2505 return r;
2506
2507 /* If this address came from an address pool, clean up the pool */
2508 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2509 if (address_equal(address, pool_address)) {
2510 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2511 address_free(pool_address);
2512 break;
2513 }
2514 }
2515 }
2516
2517 SET_FOREACH(neighbor, link->neighbors, i) {
2518 r = neighbor_remove(neighbor, link, NULL);
2519 if (r < 0)
2520 return r;
2521 }
2522
2523 SET_FOREACH(route, link->routes, i) {
2524 /* do not touch routes managed by the kernel */
2525 if (route->protocol == RTPROT_KERNEL)
2526 continue;
2527
2528 r = route_remove(route, link, NULL);
2529 if (r < 0)
2530 return r;
2531 }
2532
2533 ndisc_flush(link);
2534
2535 return 0;
2536 }
2537
2538 static int link_configure(Link *link) {
2539 int r;
2540
2541 assert(link);
2542 assert(link->network);
2543 assert(link->state == LINK_STATE_INITIALIZED);
2544
2545 if (link->iftype == ARPHRD_CAN)
2546 return link_configure_can(link);
2547
2548 /* Drop foreign config, but ignore loopback or critical devices.
2549 * We do not want to remove loopback address or addresses used for root NFS. */
2550 if (!(link->flags & IFF_LOOPBACK) &&
2551 link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
2552 r = link_drop_foreign_config(link);
2553 if (r < 0)
2554 return r;
2555 }
2556
2557 r = link_set_proxy_arp(link);
2558 if (r < 0)
2559 return r;
2560
2561 r = ipv6_proxy_ndp_addresses_configure(link);
2562 if (r < 0)
2563 return r;
2564
2565 r = link_set_ipv4_forward(link);
2566 if (r < 0)
2567 return r;
2568
2569 r = link_set_ipv6_forward(link);
2570 if (r < 0)
2571 return r;
2572
2573 r = link_set_ipv6_privacy_extensions(link);
2574 if (r < 0)
2575 return r;
2576
2577 r = link_set_ipv6_accept_ra(link);
2578 if (r < 0)
2579 return r;
2580
2581 r = link_set_ipv6_dad_transmits(link);
2582 if (r < 0)
2583 return r;
2584
2585 r = link_set_ipv6_hop_limit(link);
2586 if (r < 0)
2587 return r;
2588
2589 r = link_set_flags(link);
2590 if (r < 0)
2591 return r;
2592
2593 r = link_set_ipv6_mtu(link);
2594 if (r < 0)
2595 return r;
2596
2597 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
2598 r = ipv4ll_configure(link);
2599 if (r < 0)
2600 return r;
2601 }
2602
2603 if (link_dhcp4_enabled(link)) {
2604 r = dhcp4_set_promote_secondaries(link);
2605 if (r < 0)
2606 return r;
2607
2608 r = dhcp4_configure(link);
2609 if (r < 0)
2610 return r;
2611 }
2612
2613 if (link_dhcp4_server_enabled(link)) {
2614 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2615 if (r < 0)
2616 return r;
2617
2618 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2619 if (r < 0)
2620 return r;
2621 }
2622
2623 if (link_dhcp6_enabled(link) ||
2624 link_ipv6_accept_ra_enabled(link)) {
2625 r = dhcp6_configure(link);
2626 if (r < 0)
2627 return r;
2628 }
2629
2630 if (link_ipv6_accept_ra_enabled(link)) {
2631 r = ndisc_configure(link);
2632 if (r < 0)
2633 return r;
2634 }
2635
2636 if (link_radv_enabled(link)) {
2637 r = radv_configure(link);
2638 if (r < 0)
2639 return r;
2640 }
2641
2642 if (link_lldp_rx_enabled(link)) {
2643 r = link_lldp_rx_configure(link);
2644 if (r < 0)
2645 return r;
2646 }
2647
2648 r = link_configure_mtu(link);
2649 if (r < 0)
2650 return r;
2651
2652 r = link_configure_addrgen_mode(link);
2653 if (r < 0)
2654 return r;
2655
2656 return link_configure_after_setting_mtu(link);
2657 }
2658
2659 static int link_configure_after_setting_mtu(Link *link) {
2660 int r;
2661
2662 assert(link);
2663 assert(link->network);
2664 assert(link->state == LINK_STATE_INITIALIZED);
2665
2666 if (link->setting_mtu)
2667 return 0;
2668
2669 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2670 r = link_acquire_conf(link);
2671 if (r < 0)
2672 return r;
2673 }
2674
2675 return link_enter_join_netdev(link);
2676 }
2677
2678 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
2679 assert(duid);
2680
2681 if (duid->raw_data_len > 0)
2682 return 0;
2683
2684 if (duid->type != DUID_TYPE_UUID)
2685 return -EINVAL;
2686
2687 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
2688 duid->raw_data_len = sizeof(sd_id128_t);
2689
2690 return 1;
2691 }
2692
2693 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
2694 Manager *manager = userdata;
2695 const sd_bus_error *e;
2696 const void *a;
2697 size_t sz;
2698 DUID *duid;
2699 Link *link;
2700 int r;
2701
2702 assert(m);
2703 assert(manager);
2704
2705 e = sd_bus_message_get_error(m);
2706 if (e) {
2707 log_error_errno(sd_bus_error_get_errno(e),
2708 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
2709 e->message);
2710 goto configure;
2711 }
2712
2713 r = sd_bus_message_read_array(m, 'y', &a, &sz);
2714 if (r < 0)
2715 goto configure;
2716
2717 if (sz != sizeof(sd_id128_t)) {
2718 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
2719 goto configure;
2720 }
2721
2722 memcpy(&manager->product_uuid, a, sz);
2723 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
2724 (void) duid_set_uuid(duid, manager->product_uuid);
2725
2726 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
2727
2728 configure:
2729 while ((link = set_steal_first(manager->links_requesting_uuid))) {
2730 link_unref(link);
2731
2732 r = link_configure(link);
2733 if (r < 0)
2734 link_enter_failed(link);
2735 }
2736
2737 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
2738
2739 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
2740 * even if the method fails. */
2741 manager->has_product_uuid = true;
2742
2743 return 1;
2744 }
2745
2746 static bool link_requires_uuid(Link *link) {
2747 const DUID *duid;
2748
2749 assert(link);
2750 assert(link->manager);
2751 assert(link->network);
2752
2753 duid = link_get_duid(link);
2754 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
2755 return false;
2756
2757 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
2758 return true;
2759
2760 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
2761 return true;
2762
2763 return false;
2764 }
2765
2766 static int link_configure_duid(Link *link) {
2767 Manager *m;
2768 DUID *duid;
2769 int r;
2770
2771 assert(link);
2772 assert(link->manager);
2773 assert(link->network);
2774
2775 m = link->manager;
2776 duid = link_get_duid(link);
2777
2778 if (!link_requires_uuid(link))
2779 return 1;
2780
2781 if (m->has_product_uuid) {
2782 (void) duid_set_uuid(duid, m->product_uuid);
2783 return 1;
2784 }
2785
2786 if (!m->links_requesting_uuid) {
2787 r = manager_request_product_uuid(m, link);
2788 if (r < 0) {
2789 if (r == -ENOMEM)
2790 return r;
2791
2792 log_link_warning_errno(link, r,
2793 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
2794 return 1;
2795 }
2796 } else {
2797 r = set_put(m->links_requesting_uuid, link);
2798 if (r < 0)
2799 return log_oom();
2800
2801 r = set_put(m->duids_requesting_uuid, duid);
2802 if (r < 0)
2803 return log_oom();
2804
2805 link_ref(link);
2806 }
2807
2808 return 0;
2809 }
2810
2811 static int link_initialized_and_synced(Link *link) {
2812 Network *network;
2813 int r;
2814
2815 assert(link);
2816 assert(link->ifname);
2817 assert(link->manager);
2818
2819 /* We may get called either from the asynchronous netlink callback,
2820 * or directly for link_add() if running in a container. See link_add(). */
2821 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
2822 return 0;
2823
2824 log_link_debug(link, "Link state is up-to-date");
2825 link_set_state(link, LINK_STATE_INITIALIZED);
2826
2827 r = link_new_bound_by_list(link);
2828 if (r < 0)
2829 return r;
2830
2831 r = link_handle_bound_by_list(link);
2832 if (r < 0)
2833 return r;
2834
2835 if (!link->network) {
2836 r = network_get(link->manager, link->sd_device, link->ifname,
2837 &link->mac, &network);
2838 if (r == -ENOENT) {
2839 link_enter_unmanaged(link);
2840 return 0;
2841 } else if (r == 0 && network->unmanaged) {
2842 link_enter_unmanaged(link);
2843 return 0;
2844 } else if (r < 0)
2845 return r;
2846
2847 if (link->flags & IFF_LOOPBACK) {
2848 if (network->link_local != ADDRESS_FAMILY_NO)
2849 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2850
2851 if (network->dhcp != ADDRESS_FAMILY_NO)
2852 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2853
2854 if (network->dhcp_server)
2855 log_link_debug(link, "Ignoring DHCP server for loopback link");
2856 }
2857
2858 r = network_apply(network, link);
2859 if (r < 0)
2860 return r;
2861 }
2862
2863 r = link_new_bound_to_list(link);
2864 if (r < 0)
2865 return r;
2866
2867 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
2868 * link_configure() is called later asynchronously. */
2869 r = link_configure_duid(link);
2870 if (r <= 0)
2871 return r;
2872
2873 r = link_configure(link);
2874 if (r < 0)
2875 return r;
2876
2877 return 0;
2878 }
2879
2880 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2881 int r;
2882
2883 r = link_initialized_and_synced(link);
2884 if (r < 0)
2885 link_enter_failed(link);
2886 return 1;
2887 }
2888
2889 int link_initialized(Link *link, sd_device *device) {
2890 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2891 int r;
2892
2893 assert(link);
2894 assert(link->manager);
2895 assert(link->manager->rtnl);
2896 assert(device);
2897
2898 if (link->state != LINK_STATE_PENDING)
2899 return 0;
2900
2901 if (link->sd_device)
2902 return 0;
2903
2904 log_link_debug(link, "udev initialized link");
2905 link_set_state(link, LINK_STATE_INITIALIZED);
2906
2907 link->sd_device = sd_device_ref(device);
2908
2909 /* udev has initialized the link, but we don't know if we have yet
2910 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2911 * when it returns we know that the pending NEWLINKs have already been
2912 * processed and that we are up-to-date */
2913
2914 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2915 link->ifindex);
2916 if (r < 0)
2917 return r;
2918
2919 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
2920 link_netlink_destroy_callback, link);
2921 if (r < 0)
2922 return r;
2923
2924 link_ref(link);
2925
2926 return 0;
2927 }
2928
2929 static int link_load(Link *link) {
2930 _cleanup_free_ char *network_file = NULL,
2931 *addresses = NULL,
2932 *routes = NULL,
2933 *dhcp4_address = NULL,
2934 *ipv4ll_address = NULL;
2935 union in_addr_union address;
2936 union in_addr_union route_dst;
2937 const char *p;
2938 int r;
2939
2940 assert(link);
2941
2942 r = parse_env_file(NULL, link->state_file,
2943 "NETWORK_FILE", &network_file,
2944 "ADDRESSES", &addresses,
2945 "ROUTES", &routes,
2946 "DHCP4_ADDRESS", &dhcp4_address,
2947 "IPV4LL_ADDRESS", &ipv4ll_address);
2948 if (r < 0 && r != -ENOENT)
2949 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
2950
2951 if (network_file) {
2952 Network *network;
2953 char *suffix;
2954
2955 /* drop suffix */
2956 suffix = strrchr(network_file, '.');
2957 if (!suffix) {
2958 log_link_debug(link, "Failed to get network name from %s", network_file);
2959 goto network_file_fail;
2960 }
2961 *suffix = '\0';
2962
2963 r = network_get_by_name(link->manager, basename(network_file), &network);
2964 if (r < 0) {
2965 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
2966 goto network_file_fail;
2967 }
2968
2969 r = network_apply(network, link);
2970 if (r < 0)
2971 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
2972 }
2973
2974 network_file_fail:
2975
2976 if (addresses) {
2977 p = addresses;
2978
2979 for (;;) {
2980 _cleanup_free_ char *address_str = NULL;
2981 char *prefixlen_str;
2982 int family;
2983 unsigned char prefixlen;
2984
2985 r = extract_first_word(&p, &address_str, NULL, 0);
2986 if (r < 0) {
2987 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
2988 continue;
2989 }
2990 if (r == 0)
2991 break;
2992
2993 prefixlen_str = strchr(address_str, '/');
2994 if (!prefixlen_str) {
2995 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
2996 continue;
2997 }
2998
2999 *prefixlen_str++ = '\0';
3000
3001 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3002 if (r != 1) {
3003 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3004 continue;
3005 }
3006
3007 r = in_addr_from_string_auto(address_str, &family, &address);
3008 if (r < 0) {
3009 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3010 continue;
3011 }
3012
3013 r = address_add(link, family, &address, prefixlen, NULL);
3014 if (r < 0)
3015 return log_link_error_errno(link, r, "Failed to add address: %m");
3016 }
3017 }
3018
3019 if (routes) {
3020 p = routes;
3021
3022 for (;;) {
3023 Route *route;
3024 _cleanup_free_ char *route_str = NULL;
3025 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3026 usec_t lifetime;
3027 char *prefixlen_str;
3028 int family;
3029 unsigned char prefixlen, tos, table;
3030 uint32_t priority;
3031
3032 r = extract_first_word(&p, &route_str, NULL, 0);
3033 if (r < 0) {
3034 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3035 continue;
3036 }
3037 if (r == 0)
3038 break;
3039
3040 prefixlen_str = strchr(route_str, '/');
3041 if (!prefixlen_str) {
3042 log_link_debug(link, "Failed to parse route %s", route_str);
3043 continue;
3044 }
3045
3046 *prefixlen_str++ = '\0';
3047
3048 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3049 if (r != 5) {
3050 log_link_debug(link,
3051 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3052 prefixlen_str);
3053 continue;
3054 }
3055
3056 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3057 if (r < 0) {
3058 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3059 continue;
3060 }
3061
3062 r = route_add(link, family, &route_dst, prefixlen, NULL, tos, priority, table, &route);
3063 if (r < 0)
3064 return log_link_error_errno(link, r, "Failed to add route: %m");
3065
3066 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3067 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3068 0, route_expire_handler, route);
3069 if (r < 0)
3070 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3071 }
3072
3073 route->lifetime = lifetime;
3074 sd_event_source_unref(route->expire);
3075 route->expire = TAKE_PTR(expire);
3076 }
3077 }
3078
3079 if (dhcp4_address) {
3080 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3081 if (r < 0) {
3082 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3083 goto dhcp4_address_fail;
3084 }
3085
3086 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3087 if (r < 0)
3088 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3089
3090 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3091 if (r < 0)
3092 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3093 }
3094
3095 dhcp4_address_fail:
3096
3097 if (ipv4ll_address) {
3098 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3099 if (r < 0) {
3100 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3101 goto ipv4ll_address_fail;
3102 }
3103
3104 r = sd_ipv4ll_new(&link->ipv4ll);
3105 if (r < 0)
3106 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3107
3108 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3109 if (r < 0)
3110 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3111 }
3112
3113 ipv4ll_address_fail:
3114
3115 return 0;
3116 }
3117
3118 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3119 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3120 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3121 Link *link;
3122 int r;
3123
3124 assert(m);
3125 assert(m->rtnl);
3126 assert(message);
3127 assert(ret);
3128
3129 r = link_new(m, message, ret);
3130 if (r < 0)
3131 return r;
3132
3133 link = *ret;
3134
3135 log_link_debug(link, "Link %d added", link->ifindex);
3136
3137 r = link_load(link);
3138 if (r < 0)
3139 return r;
3140
3141 if (detect_container() <= 0) {
3142 /* not in a container, udev will be around */
3143 sprintf(ifindex_str, "n%d", link->ifindex);
3144 r = sd_device_new_from_device_id(&device, ifindex_str);
3145 if (r < 0) {
3146 log_link_warning_errno(link, r, "Could not find device: %m");
3147 goto failed;
3148 }
3149
3150 r = sd_device_get_is_initialized(device);
3151 if (r < 0) {
3152 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3153 goto failed;
3154 }
3155 if (r == 0) {
3156 /* not yet ready */
3157 log_link_debug(link, "link pending udev initialization...");
3158 return 0;
3159 }
3160
3161 r = device_is_renaming(device);
3162 if (r < 0) {
3163 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3164 goto failed;
3165 }
3166 if (r > 0) {
3167 log_link_debug(link, "Interface is under renaming, pending initialization.");
3168 return 0;
3169 }
3170
3171 r = link_initialized(link, device);
3172 if (r < 0)
3173 goto failed;
3174 } else {
3175 r = link_initialized_and_synced(link);
3176 if (r < 0)
3177 goto failed;
3178 }
3179
3180 return 0;
3181 failed:
3182 link_enter_failed(link);
3183 return r;
3184 }
3185
3186 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3187 int r;
3188
3189 assert(link);
3190
3191 log_link_info(link, "Gained IPv6LL");
3192
3193 link->ipv6ll_address = *address;
3194 link_check_ready(link);
3195
3196 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3197 r = link_acquire_ipv6_conf(link);
3198 if (r < 0) {
3199 link_enter_failed(link);
3200 return r;
3201 }
3202 }
3203
3204 return 0;
3205 }
3206
3207 static int link_carrier_gained(Link *link) {
3208 int r;
3209
3210 assert(link);
3211
3212 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3213 r = link_acquire_conf(link);
3214 if (r < 0) {
3215 link_enter_failed(link);
3216 return r;
3217 }
3218
3219 link_set_state(link, LINK_STATE_CONFIGURING);
3220 r = link_request_set_addresses(link);
3221 if (r < 0)
3222 return r;
3223 }
3224
3225 r = link_handle_bound_by_list(link);
3226 if (r < 0)
3227 return r;
3228
3229 return 0;
3230 }
3231
3232 static int link_carrier_lost(Link *link) {
3233 int r;
3234
3235 assert(link);
3236
3237 if (link->network && link->network->ignore_carrier_loss)
3238 return 0;
3239
3240 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3241 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3242 * configuration and stop the clients as well. */
3243 if (link->setting_mtu)
3244 return 0;
3245
3246 r = link_stop_clients(link, false);
3247 if (r < 0) {
3248 link_enter_failed(link);
3249 return r;
3250 }
3251
3252 if (link_dhcp4_server_enabled(link))
3253 (void) sd_dhcp_server_stop(link->dhcp_server);
3254
3255 r = link_drop_config(link);
3256 if (r < 0)
3257 return r;
3258
3259 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3260 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3261 r = link_drop_foreign_config(link);
3262 if (r < 0)
3263 return r;
3264 }
3265
3266 r = link_handle_bound_by_list(link);
3267 if (r < 0)
3268 return r;
3269
3270 return 0;
3271 }
3272
3273 int link_carrier_reset(Link *link) {
3274 int r;
3275
3276 assert(link);
3277
3278 if (link_has_carrier(link)) {
3279 r = link_carrier_lost(link);
3280 if (r < 0)
3281 return r;
3282
3283 r = link_carrier_gained(link);
3284 if (r < 0)
3285 return r;
3286
3287 log_link_info(link, "Reset carrier");
3288 }
3289
3290 return 0;
3291 }
3292
3293 int link_update(Link *link, sd_netlink_message *m) {
3294 struct ether_addr mac;
3295 const char *ifname;
3296 uint32_t mtu;
3297 bool had_carrier, carrier_gained, carrier_lost;
3298 int old_master, r;
3299
3300 assert(link);
3301 assert(link->ifname);
3302 assert(m);
3303
3304 if (link->state == LINK_STATE_LINGER) {
3305 log_link_info(link, "Link re-added");
3306 link_set_state(link, LINK_STATE_CONFIGURING);
3307
3308 r = link_new_carrier_maps(link);
3309 if (r < 0)
3310 return r;
3311 }
3312
3313 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3314 if (r >= 0 && !streq(ifname, link->ifname)) {
3315 Manager *manager = link->manager;
3316
3317 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3318
3319 link_drop(link);
3320 r = link_add(manager, m, &link);
3321 if (r < 0)
3322 return r;
3323 }
3324
3325 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3326 if (r >= 0 && mtu > 0) {
3327 link->mtu = mtu;
3328 if (link->original_mtu == 0) {
3329 link->original_mtu = mtu;
3330 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3331 }
3332
3333 if (link->dhcp_client) {
3334 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3335 link->mtu);
3336 if (r < 0)
3337 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3338 }
3339
3340 if (link->radv) {
3341 r = sd_radv_set_mtu(link->radv, link->mtu);
3342 if (r < 0)
3343 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3344 }
3345 }
3346
3347 /* The kernel may broadcast NEWLINK messages without the MAC address
3348 set, simply ignore them. */
3349 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3350 if (r >= 0) {
3351 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3352 ETH_ALEN)) {
3353
3354 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3355 ETH_ALEN);
3356
3357 log_link_debug(link, "MAC address: "
3358 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3359 mac.ether_addr_octet[0],
3360 mac.ether_addr_octet[1],
3361 mac.ether_addr_octet[2],
3362 mac.ether_addr_octet[3],
3363 mac.ether_addr_octet[4],
3364 mac.ether_addr_octet[5]);
3365
3366 if (link->ipv4ll) {
3367 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3368 if (r < 0)
3369 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3370 }
3371
3372 if (link->dhcp_client) {
3373 r = sd_dhcp_client_set_mac(link->dhcp_client,
3374 (const uint8_t *) &link->mac,
3375 sizeof (link->mac),
3376 ARPHRD_ETHER);
3377 if (r < 0)
3378 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3379
3380 r = dhcp4_set_client_identifier(link);
3381 if (r < 0)
3382 return r;
3383 }
3384
3385 if (link->dhcp6_client) {
3386 const DUID* duid = link_get_duid(link);
3387
3388 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3389 (const uint8_t *) &link->mac,
3390 sizeof (link->mac),
3391 ARPHRD_ETHER);
3392 if (r < 0)
3393 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3394
3395 if (link->network->iaid_set) {
3396 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3397 link->network->iaid);
3398 if (r < 0)
3399 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3400 }
3401
3402 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3403 duid->type,
3404 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3405 duid->raw_data_len);
3406 if (r < 0)
3407 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3408 }
3409
3410 if (link->radv) {
3411 r = sd_radv_set_mac(link->radv, &link->mac);
3412 if (r < 0)
3413 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3414 }
3415
3416 if (link->ndisc) {
3417 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3418 if (r < 0)
3419 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3420 }
3421 }
3422 }
3423
3424 old_master = link->master_ifindex;
3425 (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
3426
3427 had_carrier = link_has_carrier(link);
3428
3429 r = link_update_flags(link, m, old_master != link->master_ifindex);
3430 if (r < 0)
3431 return r;
3432
3433 r = link_update_lldp(link);
3434 if (r < 0)
3435 return r;
3436
3437 carrier_gained = !had_carrier && link_has_carrier(link);
3438 carrier_lost = had_carrier && !link_has_carrier(link);
3439
3440 if (carrier_gained) {
3441 log_link_info(link, "Gained carrier");
3442
3443 r = link_carrier_gained(link);
3444 if (r < 0)
3445 return r;
3446 } else if (carrier_lost) {
3447 log_link_info(link, "Lost carrier");
3448
3449 r = link_carrier_lost(link);
3450 if (r < 0)
3451 return r;
3452 }
3453
3454 return 0;
3455 }
3456
3457 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3458 bool space = false;
3459 Iterator i;
3460 Link *link;
3461
3462 assert(f);
3463 assert(prefix);
3464
3465 if (hashmap_isempty(h))
3466 return;
3467
3468 fputs(prefix, f);
3469 HASHMAP_FOREACH(link, h, i) {
3470 if (space)
3471 fputc(' ', f);
3472
3473 fprintf(f, "%i", link->ifindex);
3474 space = true;
3475 }
3476
3477 fputc('\n', f);
3478 }
3479
3480 static void link_save_dns(FILE *f, struct in_addr_data *dns, unsigned n_dns, bool *space) {
3481 unsigned j;
3482 int r;
3483
3484 for (j = 0; j < n_dns; j++) {
3485 _cleanup_free_ char *b = NULL;
3486
3487 r = in_addr_to_string(dns[j].family, &dns[j].address, &b);
3488 if (r < 0) {
3489 log_debug_errno(r, "Failed to format address, ignoring: %m");
3490 continue;
3491 }
3492
3493 if (*space)
3494 fputc(' ', f);
3495 fputs(b, f);
3496 *space = true;
3497 }
3498 }
3499
3500 int link_save(Link *link) {
3501 _cleanup_free_ char *temp_path = NULL;
3502 _cleanup_fclose_ FILE *f = NULL;
3503 const char *admin_state, *oper_state, *carrier_state, *address_state;
3504 Address *a;
3505 Route *route;
3506 Iterator i;
3507 int r;
3508
3509 assert(link);
3510 assert(link->state_file);
3511 assert(link->lease_file);
3512 assert(link->manager);
3513
3514 if (link->state == LINK_STATE_LINGER) {
3515 (void) unlink(link->state_file);
3516 return 0;
3517 }
3518
3519 link_lldp_save(link);
3520
3521 admin_state = link_state_to_string(link->state);
3522 assert(admin_state);
3523
3524 oper_state = link_operstate_to_string(link->operstate);
3525 assert(oper_state);
3526
3527 carrier_state = link_carrier_state_to_string(link->carrier_state);
3528 assert(carrier_state);
3529
3530 address_state = link_address_state_to_string(link->address_state);
3531 assert(address_state);
3532
3533 r = fopen_temporary(link->state_file, &f, &temp_path);
3534 if (r < 0)
3535 goto fail;
3536
3537 (void) fchmod(fileno(f), 0644);
3538
3539 fprintf(f,
3540 "# This is private data. Do not parse.\n"
3541 "ADMIN_STATE=%s\n"
3542 "OPER_STATE=%s\n"
3543 "CARRIER_STATE=%s\n"
3544 "ADDRESS_STATE=%s\n",
3545 admin_state, oper_state, carrier_state, address_state);
3546
3547 if (link->network) {
3548 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
3549 const char *dhcp_domainname = NULL, *p;
3550 sd_dhcp6_lease *dhcp6_lease = NULL;
3551 bool space;
3552
3553 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3554 yes_no(link->network->required_for_online));
3555
3556 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
3557 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
3558
3559 if (link->dhcp6_client) {
3560 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3561 if (r < 0 && r != -ENOMSG)
3562 log_link_debug(link, "No DHCPv6 lease");
3563 }
3564
3565 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3566
3567 fputs("DNS=", f);
3568 space = false;
3569
3570 if (link->n_dns != (unsigned) -1)
3571 link_save_dns(f, link->dns, link->n_dns, &space);
3572 else
3573 link_save_dns(f, link->network->dns, link->network->n_dns, &space);
3574
3575 if (link->network->dhcp_use_dns &&
3576 link->dhcp_lease) {
3577 const struct in_addr *addresses;
3578
3579 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3580 if (r > 0)
3581 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3582 space = true;
3583 }
3584
3585 if (link->network->dhcp6_use_dns && dhcp6_lease) {
3586 struct in6_addr *in6_addrs;
3587
3588 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &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
3597 /* Make sure to flush out old entries before we use the NDISC data */
3598 ndisc_vacuum(link);
3599
3600 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3601 NDiscRDNSS *dd;
3602
3603 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3604 if (space)
3605 fputc(' ', f);
3606
3607 serialize_in6_addrs(f, &dd->address, 1);
3608 space = true;
3609 }
3610 }
3611
3612 fputc('\n', f);
3613
3614 fputs("NTP=", f);
3615 space = false;
3616 fputstrv(f, link->ntp ?: link->network->ntp, NULL, &space);
3617
3618 if (link->network->dhcp_use_ntp &&
3619 link->dhcp_lease) {
3620 const struct in_addr *addresses;
3621
3622 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3623 if (r > 0)
3624 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3625 space = true;
3626 }
3627
3628 if (link->network->dhcp6_use_ntp && dhcp6_lease) {
3629 struct in6_addr *in6_addrs;
3630 char **hosts;
3631
3632 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3633 &in6_addrs);
3634 if (r > 0) {
3635 if (space)
3636 fputc(' ', f);
3637 serialize_in6_addrs(f, in6_addrs, r);
3638 space = true;
3639 }
3640
3641 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3642 if (r > 0)
3643 fputstrv(f, hosts, NULL, &space);
3644 }
3645
3646 fputc('\n', f);
3647
3648 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3649 if (link->dhcp_lease) {
3650 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3651 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3652 }
3653 if (dhcp6_lease)
3654 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3655 }
3656
3657 fputs("DOMAINS=", f);
3658 space = false;
3659 ORDERED_SET_FOREACH(p, link->search_domains ?: link->network->search_domains, i)
3660 fputs_with_space(f, p, NULL, &space);
3661
3662 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3663 if (dhcp_domainname)
3664 fputs_with_space(f, dhcp_domainname, NULL, &space);
3665 if (dhcp_domains)
3666 fputstrv(f, dhcp_domains, NULL, &space);
3667 if (dhcp6_domains)
3668 fputstrv(f, dhcp6_domains, NULL, &space);
3669 }
3670
3671 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_YES) {
3672 NDiscDNSSL *dd;
3673
3674 SET_FOREACH(dd, link->ndisc_dnssl, i)
3675 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3676 }
3677
3678 fputc('\n', f);
3679
3680 fputs("ROUTE_DOMAINS=", f);
3681 space = false;
3682 ORDERED_SET_FOREACH(p, link->route_domains ?: link->network->route_domains, i)
3683 fputs_with_space(f, p, NULL, &space);
3684
3685 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3686 if (dhcp_domainname)
3687 fputs_with_space(f, dhcp_domainname, NULL, &space);
3688 if (dhcp_domains)
3689 fputstrv(f, dhcp_domains, NULL, &space);
3690 if (dhcp6_domains)
3691 fputstrv(f, dhcp6_domains, NULL, &space);
3692 }
3693
3694 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3695 NDiscDNSSL *dd;
3696
3697 SET_FOREACH(dd, link->ndisc_dnssl, i)
3698 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3699 }
3700
3701 fputc('\n', f);
3702
3703 fprintf(f, "LLMNR=%s\n",
3704 resolve_support_to_string(link->llmnr >= 0 ? link->llmnr : link->network->llmnr));
3705 fprintf(f, "MDNS=%s\n",
3706 resolve_support_to_string(link->mdns >= 0 ? link->mdns : link->network->mdns));
3707 if (link->dns_default_route >= 0)
3708 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->dns_default_route));
3709 else if (link->network->dns_default_route >= 0)
3710 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
3711
3712 if (link->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3713 fprintf(f, "DNS_OVER_TLS=%s\n",
3714 dns_over_tls_mode_to_string(link->dns_over_tls_mode));
3715 else if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3716 fprintf(f, "DNS_OVER_TLS=%s\n",
3717 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
3718
3719 if (link->dnssec_mode != _DNSSEC_MODE_INVALID)
3720 fprintf(f, "DNSSEC=%s\n",
3721 dnssec_mode_to_string(link->dnssec_mode));
3722 else if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3723 fprintf(f, "DNSSEC=%s\n",
3724 dnssec_mode_to_string(link->network->dnssec_mode));
3725
3726 if (!set_isempty(link->dnssec_negative_trust_anchors)) {
3727 const char *n;
3728
3729 fputs("DNSSEC_NTA=", f);
3730 space = false;
3731 SET_FOREACH(n, link->dnssec_negative_trust_anchors, i)
3732 fputs_with_space(f, n, NULL, &space);
3733 fputc('\n', f);
3734 } else if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3735 const char *n;
3736
3737 fputs("DNSSEC_NTA=", f);
3738 space = false;
3739 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3740 fputs_with_space(f, n, NULL, &space);
3741 fputc('\n', f);
3742 }
3743
3744 fputs("ADDRESSES=", f);
3745 space = false;
3746 SET_FOREACH(a, link->addresses, i) {
3747 _cleanup_free_ char *address_str = NULL;
3748
3749 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3750 if (r < 0)
3751 goto fail;
3752
3753 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3754 space = true;
3755 }
3756 fputc('\n', f);
3757
3758 fputs("ROUTES=", f);
3759 space = false;
3760 SET_FOREACH(route, link->routes, i) {
3761 _cleanup_free_ char *route_str = NULL;
3762
3763 r = in_addr_to_string(route->family, &route->dst, &route_str);
3764 if (r < 0)
3765 goto fail;
3766
3767 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
3768 space ? " " : "", route_str,
3769 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3770 space = true;
3771 }
3772
3773 fputc('\n', f);
3774 }
3775
3776 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3777 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3778
3779 if (link->dhcp_lease) {
3780 struct in_addr address;
3781 const char *tz = NULL;
3782
3783 assert(link->network);
3784
3785 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3786 if (r >= 0)
3787 fprintf(f, "TIMEZONE=%s\n", tz);
3788
3789 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3790 if (r >= 0) {
3791 fputs("DHCP4_ADDRESS=", f);
3792 serialize_in_addrs(f, &address, 1, false, NULL);
3793 fputc('\n', f);
3794 }
3795
3796 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3797 if (r < 0)
3798 goto fail;
3799
3800 fprintf(f,
3801 "DHCP_LEASE=%s\n",
3802 link->lease_file);
3803 } else
3804 (void) unlink(link->lease_file);
3805
3806 if (link->ipv4ll) {
3807 struct in_addr address;
3808
3809 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3810 if (r >= 0) {
3811 fputs("IPV4LL_ADDRESS=", f);
3812 serialize_in_addrs(f, &address, 1, false, NULL);
3813 fputc('\n', f);
3814 }
3815 }
3816
3817 r = fflush_and_check(f);
3818 if (r < 0)
3819 goto fail;
3820
3821 if (rename(temp_path, link->state_file) < 0) {
3822 r = -errno;
3823 goto fail;
3824 }
3825
3826 return 0;
3827
3828 fail:
3829 (void) unlink(link->state_file);
3830 if (temp_path)
3831 (void) unlink(temp_path);
3832
3833 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3834 }
3835
3836 /* The serialized state in /run is no longer up-to-date. */
3837 void link_dirty(Link *link) {
3838 int r;
3839
3840 assert(link);
3841
3842 /* mark manager dirty as link is dirty */
3843 manager_dirty(link->manager);
3844
3845 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3846 if (r < 0)
3847 /* allocation errors are ignored */
3848 return;
3849
3850 r = set_put(link->manager->dirty_links, link);
3851 if (r <= 0)
3852 /* don't take another ref if the link was already dirty */
3853 return;
3854
3855 link_ref(link);
3856 }
3857
3858 /* The serialized state in /run is up-to-date */
3859 void link_clean(Link *link) {
3860 assert(link);
3861 assert(link->manager);
3862
3863 link_unref(set_remove(link->manager->dirty_links, link));
3864 }
3865
3866 static const char* const link_state_table[_LINK_STATE_MAX] = {
3867 [LINK_STATE_PENDING] = "pending",
3868 [LINK_STATE_INITIALIZED] = "initialized",
3869 [LINK_STATE_CONFIGURING] = "configuring",
3870 [LINK_STATE_CONFIGURED] = "configured",
3871 [LINK_STATE_UNMANAGED] = "unmanaged",
3872 [LINK_STATE_FAILED] = "failed",
3873 [LINK_STATE_LINGER] = "linger",
3874 };
3875
3876 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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