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network: Do not disable IPv6 by writing to sysctl
[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 enabled;
334 int r;
335
336 if (link->flags & IFF_LOOPBACK)
337 return 0;
338
339 enabled = link_ipv6_enabled(link);
340 if (enabled) {
341 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", false);
342 if (r < 0)
343 log_link_warning_errno(link, r, "Cannot enable IPv6: %m");
344 else
345 log_link_info(link, "IPv6 successfully enabled");
346 }
347
348 return 0;
349 }
350
351 static bool link_is_enslaved(Link *link) {
352 if (link->flags & IFF_SLAVE)
353 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
354 return true;
355
356 if (!link->network)
357 return false;
358
359 if (link->master_ifindex > 0 && link->network->bridge)
360 return true;
361
362 /* TODO: add conditions for other netdevs. */
363
364 return false;
365 }
366
367 static void link_update_master_operstate(Link *link, NetDev *netdev) {
368 Link *master;
369
370 if (!netdev)
371 return;
372
373 if (link_get(link->manager, netdev->ifindex, &master) < 0)
374 return;
375
376 link_update_operstate(master, true);
377 }
378
379 void link_update_operstate(Link *link, bool also_update_master) {
380 LinkOperationalState operstate;
381 LinkCarrierState carrier_state;
382 LinkAddressState address_state;
383 _cleanup_strv_free_ char **p = NULL;
384 uint8_t scope = RT_SCOPE_NOWHERE;
385 bool changed = false;
386 Address *address;
387 Iterator i;
388
389 assert(link);
390
391 if (link->kernel_operstate == IF_OPER_DORMANT)
392 carrier_state = LINK_CARRIER_STATE_DORMANT;
393 else if (link_has_carrier(link)) {
394 if (link_is_enslaved(link))
395 carrier_state = LINK_CARRIER_STATE_ENSLAVED;
396 else
397 carrier_state = LINK_CARRIER_STATE_CARRIER;
398 } else if (link->flags & IFF_UP)
399 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
400 else
401 carrier_state = LINK_CARRIER_STATE_OFF;
402
403 if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
404 Link *slave;
405
406 SET_FOREACH(slave, link->slaves, i) {
407 link_update_operstate(slave, false);
408
409 if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
410 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
411 }
412 }
413
414 SET_FOREACH(address, link->addresses, i) {
415 if (!address_is_ready(address))
416 continue;
417
418 if (address->scope < scope)
419 scope = address->scope;
420 }
421
422 /* for operstate we also take foreign addresses into account */
423 SET_FOREACH(address, link->addresses_foreign, i) {
424 if (!address_is_ready(address))
425 continue;
426
427 if (address->scope < scope)
428 scope = address->scope;
429 }
430
431 if (scope < RT_SCOPE_SITE)
432 /* universally accessible addresses found */
433 address_state = LINK_ADDRESS_STATE_ROUTABLE;
434 else if (scope < RT_SCOPE_HOST)
435 /* only link or site local addresses found */
436 address_state = LINK_ADDRESS_STATE_DEGRADED;
437 else
438 /* no useful addresses found */
439 address_state = LINK_ADDRESS_STATE_OFF;
440
441 /* Mapping of address and carrier state vs operational state
442 * carrier state
443 * | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
444 * ------------------------------------------------------------------------------
445 * off | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
446 * address_state degraded | off | no-carrier | dormant | degraded-carrier | degraded | enslaved
447 * routable | off | no-carrier | dormant | degraded-carrier | routable | routable
448 */
449
450 if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
451 operstate = (LinkOperationalState) carrier_state;
452 else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
453 operstate = LINK_OPERSTATE_ROUTABLE;
454 else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
455 operstate = LINK_OPERSTATE_DEGRADED;
456 else
457 operstate = LINK_OPERSTATE_ENSLAVED;
458
459 if (link->carrier_state != carrier_state) {
460 link->carrier_state = carrier_state;
461 changed = true;
462 if (strv_extend(&p, "CarrierState") < 0)
463 log_oom();
464 }
465
466 if (link->address_state != address_state) {
467 link->address_state = address_state;
468 changed = true;
469 if (strv_extend(&p, "AddressState") < 0)
470 log_oom();
471 }
472
473 if (link->operstate != operstate) {
474 link->operstate = operstate;
475 changed = true;
476 if (strv_extend(&p, "OperationalState") < 0)
477 log_oom();
478 }
479
480 if (p)
481 link_send_changed_strv(link, p);
482 if (changed)
483 link_dirty(link);
484
485 if (also_update_master && link->network) {
486 link_update_master_operstate(link, link->network->bond);
487 link_update_master_operstate(link, link->network->bridge);
488 }
489 }
490
491 #define FLAG_STRING(string, flag, old, new) \
492 (((old ^ new) & flag) \
493 ? ((old & flag) ? (" -" string) : (" +" string)) \
494 : "")
495
496 static int link_update_flags(Link *link, sd_netlink_message *m, bool force_update_operstate) {
497 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
498 uint8_t operstate;
499 int r;
500
501 assert(link);
502
503 r = sd_rtnl_message_link_get_flags(m, &flags);
504 if (r < 0)
505 return log_link_warning_errno(link, r, "Could not get link flags: %m");
506
507 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
508 if (r < 0)
509 /* if we got a message without operstate, take it to mean
510 the state was unchanged */
511 operstate = link->kernel_operstate;
512
513 if (!force_update_operstate && (link->flags == flags) && (link->kernel_operstate == operstate))
514 return 0;
515
516 if (link->flags != flags) {
517 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",
518 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
519 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
520 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
521 FLAG_STRING("UP", IFF_UP, link->flags, flags),
522 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
523 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
524 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
525 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
526 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
527 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
528 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
529 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
530 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
531 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
532 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
533 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
534 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
535 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
536 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
537
538 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
539 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
540 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
541 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
542 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
543 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
544 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
545 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
546
547 /* link flags are currently at most 18 bits, let's align to
548 * printing 20 */
549 if (unknown_flags_added)
550 log_link_debug(link,
551 "Unknown link flags gained: %#.5x (ignoring)",
552 unknown_flags_added);
553
554 if (unknown_flags_removed)
555 log_link_debug(link,
556 "Unknown link flags lost: %#.5x (ignoring)",
557 unknown_flags_removed);
558 }
559
560 link->flags = flags;
561 link->kernel_operstate = operstate;
562
563 link_update_operstate(link, true);
564
565 return 0;
566 }
567
568 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
569 _cleanup_(link_unrefp) Link *link = NULL;
570 uint16_t type;
571 const char *ifname, *kind = NULL;
572 int r, ifindex;
573 unsigned short iftype;
574
575 assert(manager);
576 assert(message);
577 assert(ret);
578
579 /* check for link kind */
580 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
581 if (r == 0) {
582 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
583 r = sd_netlink_message_exit_container(message);
584 if (r < 0)
585 return r;
586 }
587
588 r = sd_netlink_message_get_type(message, &type);
589 if (r < 0)
590 return r;
591 else if (type != RTM_NEWLINK)
592 return -EINVAL;
593
594 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
595 if (r < 0)
596 return r;
597 else if (ifindex <= 0)
598 return -EINVAL;
599
600 r = sd_rtnl_message_link_get_type(message, &iftype);
601 if (r < 0)
602 return r;
603
604 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
605 if (r < 0)
606 return r;
607
608 link = new(Link, 1);
609 if (!link)
610 return -ENOMEM;
611
612 *link = (Link) {
613 .n_ref = 1,
614 .manager = manager,
615 .state = LINK_STATE_PENDING,
616 .ifindex = ifindex,
617 .iftype = iftype,
618 .sysctl_ipv6_enabled = -1,
619
620 .n_dns = (unsigned) -1,
621 .dns_default_route = -1,
622 .llmnr = _RESOLVE_SUPPORT_INVALID,
623 .mdns = _RESOLVE_SUPPORT_INVALID,
624 .dnssec_mode = _DNSSEC_MODE_INVALID,
625 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
626 };
627
628 link->ifname = strdup(ifname);
629 if (!link->ifname)
630 return -ENOMEM;
631
632 if (kind) {
633 link->kind = strdup(kind);
634 if (!link->kind)
635 return -ENOMEM;
636 }
637
638 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
639 if (r < 0)
640 log_link_debug_errno(link, r, "New device has no master, continuing without");
641
642 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
643 if (r < 0)
644 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
645
646 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
647 return -ENOMEM;
648
649 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
650 return -ENOMEM;
651
652 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
653 return -ENOMEM;
654
655 r = hashmap_ensure_allocated(&manager->links, NULL);
656 if (r < 0)
657 return r;
658
659 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
660 if (r < 0)
661 return r;
662
663 r = link_update_flags(link, message, false);
664 if (r < 0)
665 return r;
666
667 *ret = TAKE_PTR(link);
668
669 return 0;
670 }
671
672 void link_ntp_settings_clear(Link *link) {
673 link->ntp = strv_free(link->ntp);
674 }
675
676 void link_dns_settings_clear(Link *link) {
677 link->dns = mfree(link->dns);
678 link->n_dns = (unsigned) -1;
679
680 link->search_domains = ordered_set_free_free(link->search_domains);
681 link->route_domains = ordered_set_free_free(link->route_domains);
682
683 link->dns_default_route = -1;
684 link->llmnr = _RESOLVE_SUPPORT_INVALID;
685 link->mdns = _RESOLVE_SUPPORT_INVALID;
686 link->dnssec_mode = _DNSSEC_MODE_INVALID;
687 link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
688
689 link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
690 }
691
692 static Link *link_free(Link *link) {
693 Address *address;
694
695 assert(link);
696
697 link_ntp_settings_clear(link);
698 link_dns_settings_clear(link);
699
700 link->routes = set_free_with_destructor(link->routes, route_free);
701 link->routes_foreign = set_free_with_destructor(link->routes_foreign, route_free);
702
703 link->neighbors = set_free_with_destructor(link->neighbors, neighbor_free);
704 link->neighbors_foreign = set_free_with_destructor(link->neighbors_foreign, neighbor_free);
705
706 link->addresses = set_free_with_destructor(link->addresses, address_free);
707 link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free);
708
709 while ((address = link->pool_addresses)) {
710 LIST_REMOVE(addresses, link->pool_addresses, address);
711 address_free(address);
712 }
713
714 sd_dhcp_server_unref(link->dhcp_server);
715 sd_dhcp_client_unref(link->dhcp_client);
716 sd_dhcp_lease_unref(link->dhcp_lease);
717 set_free(link->dhcp_routes);
718
719 link_lldp_emit_stop(link);
720
721 free(link->lease_file);
722
723 sd_lldp_unref(link->lldp);
724 free(link->lldp_file);
725
726 ndisc_flush(link);
727
728 sd_ipv4ll_unref(link->ipv4ll);
729 sd_dhcp6_client_unref(link->dhcp6_client);
730 sd_ndisc_unref(link->ndisc);
731 sd_radv_unref(link->radv);
732
733 free(link->ifname);
734 free(link->kind);
735
736 (void) unlink(link->state_file);
737 free(link->state_file);
738
739 sd_device_unref(link->sd_device);
740
741 hashmap_free(link->bound_to_links);
742 hashmap_free(link->bound_by_links);
743
744 set_free_with_destructor(link->slaves, link_unref);
745
746 network_unref(link->network);
747
748 return mfree(link);
749 }
750
751 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
752
753 int link_get(Manager *m, int ifindex, Link **ret) {
754 Link *link;
755
756 assert(m);
757 assert(ifindex);
758 assert(ret);
759
760 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
761 if (!link)
762 return -ENODEV;
763
764 *ret = link;
765
766 return 0;
767 }
768
769 void link_set_state(Link *link, LinkState state) {
770 assert(link);
771
772 if (link->state == state)
773 return;
774
775 log_link_debug(link, "State changed: %s -> %s",
776 link_state_to_string(link->state),
777 link_state_to_string(state));
778
779 link->state = state;
780
781 link_send_changed(link, "AdministrativeState", NULL);
782 }
783
784 static void link_enter_unmanaged(Link *link) {
785 assert(link);
786
787 link_set_state(link, LINK_STATE_UNMANAGED);
788
789 link_dirty(link);
790 }
791
792 int link_stop_clients(Link *link, bool may_keep_dhcp) {
793 int r = 0, k;
794
795 assert(link);
796 assert(link->manager);
797 assert(link->manager->event);
798
799 dhcp4_release_old_lease(link);
800
801 if (link->dhcp_client && (!may_keep_dhcp || !link->network ||
802 !FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP))) {
803 k = sd_dhcp_client_stop(link->dhcp_client);
804 if (k < 0)
805 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
806 }
807
808 if (link->ipv4ll) {
809 k = sd_ipv4ll_stop(link->ipv4ll);
810 if (k < 0)
811 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
812 }
813
814 if (link->dhcp6_client) {
815 k = sd_dhcp6_client_stop(link->dhcp6_client);
816 if (k < 0)
817 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
818 }
819
820 if (link->ndisc) {
821 k = sd_ndisc_stop(link->ndisc);
822 if (k < 0)
823 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
824 }
825
826 if (link->radv) {
827 k = sd_radv_stop(link->radv);
828 if (k < 0)
829 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
830 }
831
832 link_lldp_emit_stop(link);
833 return r;
834 }
835
836 void link_enter_failed(Link *link) {
837 assert(link);
838
839 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
840 return;
841
842 log_link_warning(link, "Failed");
843
844 link_set_state(link, LINK_STATE_FAILED);
845
846 link_stop_clients(link, false);
847
848 link_dirty(link);
849 }
850
851 static int link_join_netdevs_after_configured(Link *link) {
852 NetDev *netdev;
853 Iterator i;
854 int r;
855
856 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
857 if (netdev->ifindex > 0)
858 /* Assume already enslaved. */
859 continue;
860
861 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
862 continue;
863
864 log_struct(LOG_DEBUG,
865 LOG_LINK_INTERFACE(link),
866 LOG_NETDEV_INTERFACE(netdev),
867 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
868
869 r = netdev_join(netdev, link, NULL);
870 if (r < 0)
871 return log_struct_errno(LOG_WARNING, r,
872 LOG_LINK_INTERFACE(link),
873 LOG_NETDEV_INTERFACE(netdev),
874 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
875 }
876
877 return 0;
878 }
879
880 static void link_enter_configured(Link *link) {
881 assert(link);
882 assert(link->network);
883
884 if (link->state != LINK_STATE_CONFIGURING)
885 return;
886
887 log_link_info(link, "Configured");
888
889 link_set_state(link, LINK_STATE_CONFIGURED);
890
891 (void) link_join_netdevs_after_configured(link);
892
893 link_dirty(link);
894 }
895
896 static int link_request_set_routing_policy_rule(Link *link) {
897 RoutingPolicyRule *rule, *rrule = NULL;
898 int r;
899
900 assert(link);
901 assert(link->network);
902
903 link->routing_policy_rules_configured = false;
904
905 LIST_FOREACH(rules, rule, link->network->rules) {
906 r = routing_policy_rule_get(link->manager, rule, &rrule);
907 if (r >= 0) {
908 if (r == 0)
909 (void) routing_policy_rule_make_local(link->manager, rrule);
910 continue;
911 }
912
913 r = routing_policy_rule_configure(rule, link, NULL);
914 if (r < 0)
915 return log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
916 if (r > 0)
917 link->routing_policy_rule_messages++;
918 }
919
920 routing_policy_rule_purge(link->manager, link);
921 if (link->routing_policy_rule_messages == 0) {
922 link->routing_policy_rules_configured = true;
923 link_check_ready(link);
924 } else {
925 log_link_debug(link, "Setting routing policy rules");
926 link_set_state(link, LINK_STATE_CONFIGURING);
927 }
928
929 return 0;
930 }
931
932 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
933 int r;
934
935 assert(link);
936 assert(link->route_messages > 0);
937 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
938 LINK_STATE_FAILED, LINK_STATE_LINGER));
939
940 link->route_messages--;
941
942 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
943 return 1;
944
945 r = sd_netlink_message_get_errno(m);
946 if (r < 0 && r != -EEXIST) {
947 log_link_warning_errno(link, r, "Could not set route: %m");
948 link_enter_failed(link);
949 return 1;
950 }
951
952 if (link->route_messages == 0) {
953 log_link_debug(link, "Routes set");
954 link->static_routes_configured = true;
955 link_check_ready(link);
956 }
957
958 return 1;
959 }
960
961 int link_request_set_routes(Link *link) {
962 enum {
963 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
964 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
965 _PHASE_MAX
966 } phase;
967 Route *rt;
968 int r;
969
970 assert(link);
971 assert(link->network);
972 assert(link->addresses_configured);
973 assert(link->address_messages == 0);
974 assert(link->state != _LINK_STATE_INVALID);
975
976 link->static_routes_configured = false;
977
978 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
979 /* During configuring addresses, the link lost its carrier. As networkd is dropping
980 * the addresses now, let's not configure the routes either. */
981 return 0;
982
983 r = link_request_set_routing_policy_rule(link);
984 if (r < 0)
985 return r;
986
987 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
988 for (phase = 0; phase < _PHASE_MAX; phase++)
989 LIST_FOREACH(routes, rt, link->network->static_routes) {
990
991 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
992 continue;
993
994 r = route_configure(rt, link, route_handler);
995 if (r < 0)
996 return log_link_warning_errno(link, r, "Could not set routes: %m");
997 if (r > 0)
998 link->route_messages++;
999 }
1000
1001 if (link->route_messages == 0) {
1002 link->static_routes_configured = true;
1003 link_check_ready(link);
1004 } else {
1005 log_link_debug(link, "Setting routes");
1006 link_set_state(link, LINK_STATE_CONFIGURING);
1007 }
1008
1009 return 0;
1010 }
1011
1012 void link_check_ready(Link *link) {
1013 Address *a;
1014 Iterator i;
1015 int r;
1016
1017 assert(link);
1018
1019 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1020 return;
1021
1022 if (!link->network)
1023 return;
1024
1025 if (!link->addresses_configured)
1026 return;
1027
1028 if (!link->neighbors_configured)
1029 return;
1030
1031 SET_FOREACH(a, link->addresses, i)
1032 if (!address_is_ready(a))
1033 return;
1034
1035 if (!link->addresses_ready) {
1036 link->addresses_ready = true;
1037 r = link_request_set_routes(link);
1038 if (r < 0)
1039 link_enter_failed(link);
1040 return;
1041 }
1042
1043 if (!link->static_routes_configured)
1044 return;
1045
1046 if (!link->routing_policy_rules_configured)
1047 return;
1048
1049 if (link_has_carrier(link) || !link->network->configure_without_carrier) {
1050
1051 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !(link->ipv4ll_address && link->ipv4ll_route))
1052 return;
1053
1054 if (link_ipv6ll_enabled(link) &&
1055 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
1056 return;
1057
1058 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
1059 !link->dhcp4_configured &&
1060 !link->dhcp6_configured &&
1061 !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address && link->ipv4ll_route))
1062 /* When DHCP is enabled, at least one protocol must provide an address, or
1063 * an IPv4ll fallback address must be configured. */
1064 return;
1065
1066 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
1067 return;
1068 }
1069
1070 if (link->state != LINK_STATE_CONFIGURED)
1071 link_enter_configured(link);
1072
1073 return;
1074 }
1075
1076 static int link_request_set_neighbors(Link *link) {
1077 Neighbor *neighbor;
1078 int r;
1079
1080 assert(link);
1081 assert(link->network);
1082 assert(link->state != _LINK_STATE_INVALID);
1083
1084 link->neighbors_configured = false;
1085
1086 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1087 r = neighbor_configure(neighbor, link, NULL);
1088 if (r < 0)
1089 return log_link_warning_errno(link, r, "Could not set neighbor: %m");
1090 }
1091
1092 if (link->neighbor_messages == 0) {
1093 link->neighbors_configured = true;
1094 link_check_ready(link);
1095 } else {
1096 log_link_debug(link, "Setting neighbors");
1097 link_set_state(link, LINK_STATE_CONFIGURING);
1098 }
1099
1100 return 0;
1101 }
1102
1103 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1104 int r;
1105
1106 assert(rtnl);
1107 assert(m);
1108 assert(link);
1109 assert(link->ifname);
1110 assert(link->address_messages > 0);
1111 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1112 LINK_STATE_FAILED, LINK_STATE_LINGER));
1113
1114 link->address_messages--;
1115
1116 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1117 return 1;
1118
1119 r = sd_netlink_message_get_errno(m);
1120 if (r < 0 && r != -EEXIST) {
1121 log_link_warning_errno(link, r, "could not set address: %m");
1122 link_enter_failed(link);
1123 return 1;
1124 } else if (r >= 0)
1125 (void) manager_rtnl_process_address(rtnl, m, link->manager);
1126
1127 if (link->address_messages == 0) {
1128 log_link_debug(link, "Addresses set");
1129 link->addresses_configured = true;
1130 link_check_ready(link);
1131 }
1132
1133 return 1;
1134 }
1135
1136 static int link_set_bridge_fdb(Link *link) {
1137 FdbEntry *fdb_entry;
1138 int r;
1139
1140 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1141 r = fdb_entry_configure(link, fdb_entry);
1142 if (r < 0)
1143 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1144 }
1145
1146 return 0;
1147 }
1148
1149 static int link_request_set_addresses(Link *link) {
1150 AddressLabel *label;
1151 Address *ad;
1152 int r;
1153
1154 assert(link);
1155 assert(link->network);
1156 assert(link->state != _LINK_STATE_INVALID);
1157
1158 /* Reset all *_configured flags we are configuring. */
1159 link->addresses_configured = false;
1160 link->addresses_ready = false;
1161 link->neighbors_configured = false;
1162 link->static_routes_configured = false;
1163 link->routing_policy_rules_configured = false;
1164
1165 r = link_set_bridge_fdb(link);
1166 if (r < 0)
1167 return r;
1168
1169 r = link_request_set_neighbors(link);
1170 if (r < 0)
1171 return r;
1172
1173 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1174 bool update;
1175
1176 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1177
1178 r = address_configure(ad, link, address_handler, update);
1179 if (r < 0)
1180 return log_link_warning_errno(link, r, "Could not set addresses: %m");
1181 if (r > 0)
1182 link->address_messages++;
1183 }
1184
1185 LIST_FOREACH(labels, label, link->network->address_labels) {
1186 r = address_label_configure(label, link, NULL, false);
1187 if (r < 0)
1188 return log_link_warning_errno(link, r, "Could not set address label: %m");
1189
1190 link->address_label_messages++;
1191 }
1192
1193 /* now that we can figure out a default address for the dhcp server,
1194 start it */
1195 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1196 r = dhcp4_server_configure(link);
1197 if (r < 0)
1198 return r;
1199 log_link_debug(link, "Offering DHCPv4 leases");
1200 }
1201
1202 if (link->address_messages == 0) {
1203 link->addresses_configured = true;
1204 link_check_ready(link);
1205 } else {
1206 log_link_debug(link, "Setting addresses");
1207 link_set_state(link, LINK_STATE_CONFIGURING);
1208 }
1209
1210 return 0;
1211 }
1212
1213 static int link_set_bridge_vlan(Link *link) {
1214 int r;
1215
1216 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1217 if (r < 0)
1218 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1219
1220 return r;
1221 }
1222
1223 static int link_set_proxy_arp(Link *link) {
1224 int r;
1225
1226 if (!link_proxy_arp_enabled(link))
1227 return 0;
1228
1229 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1230 if (r < 0)
1231 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1232
1233 return 0;
1234 }
1235
1236 static int link_configure_after_setting_mtu(Link *link);
1237
1238 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1239 int r;
1240
1241 assert(m);
1242 assert(link);
1243 assert(link->ifname);
1244
1245 link->setting_mtu = false;
1246
1247 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1248 return 1;
1249
1250 r = sd_netlink_message_get_errno(m);
1251 if (r < 0)
1252 log_link_warning_errno(link, r, "Could not set MTU, ignoring: %m");
1253 else
1254 log_link_debug(link, "Setting MTU done.");
1255
1256 if (link->state == LINK_STATE_INITIALIZED) {
1257 r = link_configure_after_setting_mtu(link);
1258 if (r < 0)
1259 link_enter_failed(link);
1260 }
1261
1262 return 1;
1263 }
1264
1265 int link_set_mtu(Link *link, uint32_t mtu) {
1266 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1267 int r;
1268
1269 assert(link);
1270 assert(link->manager);
1271 assert(link->manager->rtnl);
1272
1273 if (mtu == 0 || link->setting_mtu)
1274 return 0;
1275
1276 if (link->mtu == mtu)
1277 return 0;
1278
1279 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1280
1281 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1282 if (r < 0)
1283 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1284
1285 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1286 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1287 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1288
1289 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1290 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1291
1292 mtu = IPV6_MIN_MTU;
1293 }
1294
1295 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1296 if (r < 0)
1297 return log_link_error_errno(link, r, "Could not append MTU: %m");
1298
1299 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1300 link_netlink_destroy_callback, link);
1301 if (r < 0)
1302 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1303
1304 link_ref(link);
1305 link->setting_mtu = true;
1306
1307 return 0;
1308 }
1309
1310 static bool link_reduces_vlan_mtu(Link *link) {
1311 /* See netif_reduces_vlan_mtu() in kernel. */
1312 return streq_ptr(link->kind, "macsec");
1313 }
1314
1315 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1316 uint32_t mtu = 0;
1317 NetDev *dev;
1318 Iterator i;
1319
1320 HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1321 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1322 /* See vlan_dev_change_mtu() in kernel. */
1323 mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1324
1325 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1326 /* See macvlan_change_mtu() in kernel. */
1327 mtu = dev->mtu;
1328
1329 return mtu;
1330 }
1331
1332 static int link_configure_mtu(Link *link) {
1333 uint32_t mtu;
1334
1335 assert(link);
1336 assert(link->network);
1337
1338 if (link->network->mtu > 0)
1339 return link_set_mtu(link, link->network->mtu);
1340
1341 mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1342 if (link->mtu >= mtu)
1343 return 0;
1344
1345 log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1346 "If it is not desired, then please explicitly specify MTUBytes= setting.",
1347 link->mtu, mtu);
1348
1349 return link_set_mtu(link, mtu);
1350 }
1351
1352 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1353 int r;
1354
1355 assert(m);
1356 assert(link);
1357 assert(link->ifname);
1358
1359 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1360 return 1;
1361
1362 r = sd_netlink_message_get_errno(m);
1363 if (r < 0)
1364 log_link_warning_errno(link, r, "Could not set link flags, ignoring: %m");
1365
1366 return 1;
1367 }
1368
1369 static int link_set_flags(Link *link) {
1370 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1371 unsigned ifi_change = 0;
1372 unsigned ifi_flags = 0;
1373 int r;
1374
1375 assert(link);
1376 assert(link->manager);
1377 assert(link->manager->rtnl);
1378
1379 if (link->flags & IFF_LOOPBACK)
1380 return 0;
1381
1382 if (!link->network)
1383 return 0;
1384
1385 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1386 return 0;
1387
1388 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1389 if (r < 0)
1390 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1391
1392 if (link->network->arp >= 0) {
1393 ifi_change |= IFF_NOARP;
1394 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1395 }
1396
1397 if (link->network->multicast >= 0) {
1398 ifi_change |= IFF_MULTICAST;
1399 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1400 }
1401
1402 if (link->network->allmulticast >= 0) {
1403 ifi_change |= IFF_ALLMULTI;
1404 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1405 }
1406
1407 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1408 if (r < 0)
1409 return log_link_error_errno(link, r, "Could not set link flags: %m");
1410
1411 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1412 link_netlink_destroy_callback, link);
1413 if (r < 0)
1414 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1415
1416 link_ref(link);
1417
1418 return 0;
1419 }
1420
1421 static int link_acquire_ipv6_conf(Link *link) {
1422 int r;
1423
1424 assert(link);
1425
1426 if (link_ipv6_accept_ra_enabled(link)) {
1427 assert(link->ndisc);
1428
1429 log_link_debug(link, "Discovering IPv6 routers");
1430
1431 r = sd_ndisc_start(link->ndisc);
1432 if (r < 0 && r != -EBUSY)
1433 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1434 }
1435
1436 if (link_radv_enabled(link)) {
1437 assert(link->radv);
1438 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1439
1440 log_link_debug(link, "Starting IPv6 Router Advertisements");
1441
1442 r = sd_radv_start(link->radv);
1443 if (r < 0 && r != -EBUSY)
1444 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1445 }
1446
1447 (void) dhcp6_request_prefix_delegation(link);
1448
1449 return 0;
1450 }
1451
1452 static int link_acquire_ipv4_conf(Link *link) {
1453 int r;
1454
1455 assert(link);
1456 assert(link->manager);
1457 assert(link->manager->event);
1458
1459 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1460 assert(link->ipv4ll);
1461
1462 log_link_debug(link, "Acquiring IPv4 link-local address");
1463
1464 r = sd_ipv4ll_start(link->ipv4ll);
1465 if (r < 0)
1466 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1467 }
1468
1469 if (link_dhcp4_enabled(link)) {
1470 assert(link->dhcp_client);
1471
1472 log_link_debug(link, "Acquiring DHCPv4 lease");
1473
1474 r = sd_dhcp_client_start(link->dhcp_client);
1475 if (r < 0)
1476 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1477 }
1478
1479 return 0;
1480 }
1481
1482 static int link_acquire_conf(Link *link) {
1483 int r;
1484
1485 assert(link);
1486
1487 r = link_acquire_ipv4_conf(link);
1488 if (r < 0)
1489 return r;
1490
1491 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1492 r = link_acquire_ipv6_conf(link);
1493 if (r < 0)
1494 return r;
1495 }
1496
1497 if (link_lldp_emit_enabled(link)) {
1498 r = link_lldp_emit_start(link);
1499 if (r < 0)
1500 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1501 }
1502
1503 return 0;
1504 }
1505
1506 bool link_has_carrier(Link *link) {
1507 /* see Documentation/networking/operstates.txt in the kernel sources */
1508
1509 if (link->kernel_operstate == IF_OPER_UP)
1510 return true;
1511
1512 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1513 /* operstate may not be implemented, so fall back to flags */
1514 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1515 !FLAGS_SET(link->flags, IFF_DORMANT))
1516 return true;
1517
1518 return false;
1519 }
1520
1521 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1522 int r;
1523
1524 assert(link);
1525
1526 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1527 return 1;
1528
1529 r = sd_netlink_message_get_errno(m);
1530 if (r < 0)
1531 log_link_warning_errno(link, r, "Could not set address genmode for interface, ignoring: %m");
1532
1533 return 1;
1534 }
1535
1536 static int link_configure_addrgen_mode(Link *link) {
1537 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1538 uint8_t ipv6ll_mode;
1539 int r;
1540
1541 assert(link);
1542 assert(link->network);
1543 assert(link->manager);
1544 assert(link->manager->rtnl);
1545
1546 if (!socket_ipv6_is_supported())
1547 return 0;
1548
1549 log_link_debug(link, "Setting address genmode for link");
1550
1551 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1552 if (r < 0)
1553 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1554
1555 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1556 if (r < 0)
1557 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1558
1559 r = sd_netlink_message_open_container(req, AF_INET6);
1560 if (r < 0)
1561 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1562
1563 if (!link_ipv6ll_enabled(link))
1564 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1565 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1566 /* The file may not exist. And event if it exists, when stable_secret is unset,
1567 * reading the file fails with EIO. */
1568 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1569 else
1570 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1571
1572 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1573 if (r < 0)
1574 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1575
1576 r = sd_netlink_message_close_container(req);
1577 if (r < 0)
1578 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1579
1580 r = sd_netlink_message_close_container(req);
1581 if (r < 0)
1582 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1583
1584 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1585 link_netlink_destroy_callback, link);
1586 if (r < 0)
1587 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1588
1589 link_ref(link);
1590
1591 return 0;
1592 }
1593
1594 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1595 int r;
1596
1597 assert(link);
1598
1599 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1600 return 1;
1601
1602 r = sd_netlink_message_get_errno(m);
1603 if (r < 0)
1604 /* we warn but don't fail the link, as it may be brought up later */
1605 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1606
1607 return 1;
1608 }
1609
1610 static int link_up(Link *link) {
1611 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1612 int r;
1613
1614 assert(link);
1615 assert(link->network);
1616 assert(link->manager);
1617 assert(link->manager->rtnl);
1618
1619 log_link_debug(link, "Bringing link up");
1620
1621 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1622 if (r < 0)
1623 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1624
1625 /* set it free if not enslaved with networkd */
1626 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1627 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1628 if (r < 0)
1629 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1630 }
1631
1632 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1633 if (r < 0)
1634 return log_link_error_errno(link, r, "Could not set link flags: %m");
1635
1636 if (link->network->mac) {
1637 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1638 if (r < 0)
1639 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1640 }
1641
1642 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1643 link_netlink_destroy_callback, link);
1644 if (r < 0)
1645 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1646
1647 link_ref(link);
1648
1649 return 0;
1650 }
1651
1652 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1653 int r;
1654
1655 assert(link);
1656
1657 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1658 return 1;
1659
1660 r = sd_netlink_message_get_errno(m);
1661 if (r < 0)
1662 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1663
1664 return 1;
1665 }
1666
1667 int link_down(Link *link, link_netlink_message_handler_t callback) {
1668 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1669 int r;
1670
1671 assert(link);
1672 assert(link->manager);
1673 assert(link->manager->rtnl);
1674
1675 log_link_debug(link, "Bringing link down");
1676
1677 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1678 RTM_SETLINK, link->ifindex);
1679 if (r < 0)
1680 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1681
1682 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1683 if (r < 0)
1684 return log_link_error_errno(link, r, "Could not set link flags: %m");
1685
1686 r = netlink_call_async(link->manager->rtnl, NULL, req,
1687 callback ?: link_down_handler,
1688 link_netlink_destroy_callback, link);
1689 if (r < 0)
1690 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1691
1692 link_ref(link);
1693
1694 return 0;
1695 }
1696
1697 static int link_handle_bound_to_list(Link *link) {
1698 Link *l;
1699 Iterator i;
1700 int r;
1701 bool required_up = false;
1702 bool link_is_up = false;
1703
1704 assert(link);
1705
1706 if (hashmap_isempty(link->bound_to_links))
1707 return 0;
1708
1709 if (link->flags & IFF_UP)
1710 link_is_up = true;
1711
1712 HASHMAP_FOREACH (l, link->bound_to_links, i)
1713 if (link_has_carrier(l)) {
1714 required_up = true;
1715 break;
1716 }
1717
1718 if (!required_up && link_is_up) {
1719 r = link_down(link, NULL);
1720 if (r < 0)
1721 return r;
1722 } else if (required_up && !link_is_up) {
1723 r = link_up(link);
1724 if (r < 0)
1725 return r;
1726 }
1727
1728 return 0;
1729 }
1730
1731 static int link_handle_bound_by_list(Link *link) {
1732 Iterator i;
1733 Link *l;
1734 int r;
1735
1736 assert(link);
1737
1738 if (hashmap_isempty(link->bound_by_links))
1739 return 0;
1740
1741 HASHMAP_FOREACH (l, link->bound_by_links, i) {
1742 r = link_handle_bound_to_list(l);
1743 if (r < 0)
1744 return r;
1745 }
1746
1747 return 0;
1748 }
1749
1750 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1751 int r;
1752
1753 assert(link);
1754 assert(carrier);
1755
1756 if (link == carrier)
1757 return 0;
1758
1759 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1760 return 0;
1761
1762 r = hashmap_ensure_allocated(h, NULL);
1763 if (r < 0)
1764 return r;
1765
1766 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1767 if (r < 0)
1768 return r;
1769
1770 return 0;
1771 }
1772
1773 static int link_new_bound_by_list(Link *link) {
1774 Manager *m;
1775 Link *carrier;
1776 Iterator i;
1777 int r;
1778 bool list_updated = false;
1779
1780 assert(link);
1781 assert(link->manager);
1782
1783 m = link->manager;
1784
1785 HASHMAP_FOREACH(carrier, m->links, i) {
1786 if (!carrier->network)
1787 continue;
1788
1789 if (strv_isempty(carrier->network->bind_carrier))
1790 continue;
1791
1792 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
1793 r = link_put_carrier(link, carrier, &link->bound_by_links);
1794 if (r < 0)
1795 return r;
1796
1797 list_updated = true;
1798 }
1799 }
1800
1801 if (list_updated)
1802 link_dirty(link);
1803
1804 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
1805 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1806 if (r < 0)
1807 return r;
1808
1809 link_dirty(carrier);
1810 }
1811
1812 return 0;
1813 }
1814
1815 static int link_new_bound_to_list(Link *link) {
1816 Manager *m;
1817 Link *carrier;
1818 Iterator i;
1819 int r;
1820 bool list_updated = false;
1821
1822 assert(link);
1823 assert(link->manager);
1824
1825 if (!link->network)
1826 return 0;
1827
1828 if (strv_isempty(link->network->bind_carrier))
1829 return 0;
1830
1831 m = link->manager;
1832
1833 HASHMAP_FOREACH (carrier, m->links, i) {
1834 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
1835 r = link_put_carrier(link, carrier, &link->bound_to_links);
1836 if (r < 0)
1837 return r;
1838
1839 list_updated = true;
1840 }
1841 }
1842
1843 if (list_updated)
1844 link_dirty(link);
1845
1846 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
1847 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
1848 if (r < 0)
1849 return r;
1850
1851 link_dirty(carrier);
1852 }
1853
1854 return 0;
1855 }
1856
1857 static int link_new_carrier_maps(Link *link) {
1858 int r;
1859
1860 r = link_new_bound_by_list(link);
1861 if (r < 0)
1862 return r;
1863
1864 r = link_handle_bound_by_list(link);
1865 if (r < 0)
1866 return r;
1867
1868 r = link_new_bound_to_list(link);
1869 if (r < 0)
1870 return r;
1871
1872 r = link_handle_bound_to_list(link);
1873 if (r < 0)
1874 return r;
1875
1876 return 0;
1877 }
1878
1879 static void link_free_bound_to_list(Link *link) {
1880 Link *bound_to;
1881 Iterator i;
1882
1883 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
1884 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
1885
1886 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
1887 link_dirty(bound_to);
1888 }
1889
1890 return;
1891 }
1892
1893 static void link_free_bound_by_list(Link *link) {
1894 Link *bound_by;
1895 Iterator i;
1896
1897 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
1898 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
1899
1900 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
1901 link_dirty(bound_by);
1902 link_handle_bound_to_list(bound_by);
1903 }
1904 }
1905
1906 return;
1907 }
1908
1909 static void link_free_carrier_maps(Link *link) {
1910 bool list_updated = false;
1911
1912 assert(link);
1913
1914 if (!hashmap_isempty(link->bound_to_links)) {
1915 link_free_bound_to_list(link);
1916 list_updated = true;
1917 }
1918
1919 if (!hashmap_isempty(link->bound_by_links)) {
1920 link_free_bound_by_list(link);
1921 list_updated = true;
1922 }
1923
1924 if (list_updated)
1925 link_dirty(link);
1926
1927 return;
1928 }
1929
1930 static int link_append_to_master(Link *link, NetDev *netdev) {
1931 Link *master;
1932 int r;
1933
1934 assert(link);
1935 assert(netdev);
1936
1937 r = link_get(link->manager, netdev->ifindex, &master);
1938 if (r < 0)
1939 return r;
1940
1941 r = set_ensure_allocated(&master->slaves, NULL);
1942 if (r < 0)
1943 return r;
1944
1945 r = set_put(master->slaves, link);
1946 if (r < 0)
1947 return r;
1948 if (r == 0)
1949 return 0;
1950
1951 link_ref(link);
1952 return 0;
1953 }
1954
1955 static void link_drop_from_master(Link *link, NetDev *netdev) {
1956 Link *master;
1957
1958 assert(link);
1959
1960 if (!link->manager || !netdev)
1961 return;
1962
1963 if (link_get(link->manager, netdev->ifindex, &master) < 0)
1964 return;
1965
1966 link_unref(set_remove(master->slaves, link));
1967 }
1968
1969 static void link_detach_from_manager(Link *link) {
1970 if (!link || !link->manager)
1971 return;
1972
1973 link_unref(set_remove(link->manager->links_requesting_uuid, link));
1974 link_clean(link);
1975
1976 /* The following must be called at last. */
1977 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
1978 link_unref(link);
1979 }
1980
1981 void link_drop(Link *link) {
1982 if (!link || link->state == LINK_STATE_LINGER)
1983 return;
1984
1985 link_set_state(link, LINK_STATE_LINGER);
1986
1987 link_free_carrier_maps(link);
1988
1989 if (link->network) {
1990 link_drop_from_master(link, link->network->bridge);
1991 link_drop_from_master(link, link->network->bond);
1992 }
1993
1994 log_link_debug(link, "Link removed");
1995
1996 (void) unlink(link->state_file);
1997 link_detach_from_manager(link);
1998 }
1999
2000 static int link_joined(Link *link) {
2001 int r;
2002
2003 assert(link);
2004 assert(link->network);
2005
2006 if (!hashmap_isempty(link->bound_to_links)) {
2007 r = link_handle_bound_to_list(link);
2008 if (r < 0)
2009 return r;
2010 } else if (!(link->flags & IFF_UP)) {
2011 r = link_up(link);
2012 if (r < 0) {
2013 link_enter_failed(link);
2014 return r;
2015 }
2016 }
2017
2018 if (link->network->bridge) {
2019 r = link_set_bridge(link);
2020 if (r < 0)
2021 log_link_error_errno(link, r, "Could not set bridge message: %m");
2022
2023 r = link_append_to_master(link, link->network->bridge);
2024 if (r < 0)
2025 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2026 }
2027
2028 if (link->network->bond) {
2029 r = link_set_bond(link);
2030 if (r < 0)
2031 log_link_error_errno(link, r, "Could not set bond message: %m");
2032
2033 r = link_append_to_master(link, link->network->bond);
2034 if (r < 0)
2035 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2036 }
2037
2038 if (link->network->use_br_vlan &&
2039 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2040 r = link_set_bridge_vlan(link);
2041 if (r < 0)
2042 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2043 }
2044
2045 /* Skip setting up addresses until it gets carrier,
2046 or it would try to set addresses twice,
2047 which is bad for non-idempotent steps. */
2048 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2049 return 0;
2050
2051 link_set_state(link, LINK_STATE_CONFIGURING);
2052 return link_request_set_addresses(link);
2053 }
2054
2055 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2056 int r;
2057
2058 assert(link);
2059 assert(link->network);
2060 assert(link->enslaving > 0);
2061
2062 link->enslaving--;
2063
2064 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2065 return 1;
2066
2067 r = sd_netlink_message_get_errno(m);
2068 if (r < 0 && r != -EEXIST) {
2069 log_link_error_errno(link, r, "Could not join netdev: %m");
2070 link_enter_failed(link);
2071 return 1;
2072 }
2073
2074 log_link_debug(link, "Joined netdev");
2075
2076 if (link->enslaving == 0) {
2077 r = link_joined(link);
2078 if (r < 0)
2079 link_enter_failed(link);
2080 }
2081
2082 return 1;
2083 }
2084
2085 static int link_enter_join_netdev(Link *link) {
2086 NetDev *netdev;
2087 Iterator i;
2088 int r;
2089
2090 assert(link);
2091 assert(link->network);
2092 assert(link->state == LINK_STATE_INITIALIZED);
2093
2094 link_set_state(link, LINK_STATE_CONFIGURING);
2095
2096 link_dirty(link);
2097 link->enslaving = 0;
2098
2099 if (link->network->bond) {
2100 if (link->network->bond->state == NETDEV_STATE_READY &&
2101 link->network->bond->ifindex == link->master_ifindex)
2102 return link_joined(link);
2103
2104 log_struct(LOG_DEBUG,
2105 LOG_LINK_INTERFACE(link),
2106 LOG_NETDEV_INTERFACE(link->network->bond),
2107 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2108
2109 link->enslaving++;
2110
2111 r = netdev_join(link->network->bond, link, netdev_join_handler);
2112 if (r < 0) {
2113 log_struct_errno(LOG_WARNING, r,
2114 LOG_LINK_INTERFACE(link),
2115 LOG_NETDEV_INTERFACE(link->network->bond),
2116 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2117 link_enter_failed(link);
2118 return r;
2119 }
2120 }
2121
2122 if (link->network->bridge) {
2123 log_struct(LOG_DEBUG,
2124 LOG_LINK_INTERFACE(link),
2125 LOG_NETDEV_INTERFACE(link->network->bridge),
2126 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2127
2128 link->enslaving++;
2129
2130 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2131 if (r < 0) {
2132 log_struct_errno(LOG_WARNING, r,
2133 LOG_LINK_INTERFACE(link),
2134 LOG_NETDEV_INTERFACE(link->network->bridge),
2135 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2136 link_enter_failed(link);
2137 return r;
2138 }
2139 }
2140
2141 if (link->network->vrf) {
2142 log_struct(LOG_DEBUG,
2143 LOG_LINK_INTERFACE(link),
2144 LOG_NETDEV_INTERFACE(link->network->vrf),
2145 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2146
2147 link->enslaving++;
2148
2149 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2150 if (r < 0) {
2151 log_struct_errno(LOG_WARNING, r,
2152 LOG_LINK_INTERFACE(link),
2153 LOG_NETDEV_INTERFACE(link->network->vrf),
2154 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2155 link_enter_failed(link);
2156 return r;
2157 }
2158 }
2159
2160 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2161
2162 if (netdev->ifindex > 0)
2163 /* Assume already enslaved. */
2164 continue;
2165
2166 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2167 continue;
2168
2169 log_struct(LOG_DEBUG,
2170 LOG_LINK_INTERFACE(link),
2171 LOG_NETDEV_INTERFACE(netdev),
2172 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2173
2174 link->enslaving++;
2175
2176 r = netdev_join(netdev, link, netdev_join_handler);
2177 if (r < 0) {
2178 log_struct_errno(LOG_WARNING, r,
2179 LOG_LINK_INTERFACE(link),
2180 LOG_NETDEV_INTERFACE(netdev),
2181 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2182 link_enter_failed(link);
2183 return r;
2184 }
2185 }
2186
2187 if (link->enslaving == 0)
2188 return link_joined(link);
2189
2190 return 0;
2191 }
2192
2193 static int link_set_ipv4_forward(Link *link) {
2194 int r;
2195
2196 if (!link_ipv4_forward_enabled(link))
2197 return 0;
2198
2199 /* We propagate the forwarding flag from one interface to the
2200 * global setting one way. This means: as long as at least one
2201 * interface was configured at any time that had IP forwarding
2202 * enabled the setting will stay on for good. We do this
2203 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2204 * somewhat in sync (see below). */
2205
2206 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2207 if (r < 0)
2208 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2209
2210 return 0;
2211 }
2212
2213 static int link_set_ipv6_forward(Link *link) {
2214 int r;
2215
2216 if (!link_ipv6_forward_enabled(link))
2217 return 0;
2218
2219 /* On Linux, the IPv6 stack does not know a per-interface
2220 * packet forwarding setting: either packet forwarding is on
2221 * for all, or off for all. We hence don't bother with a
2222 * per-interface setting, but simply propagate the interface
2223 * flag, if it is set, to the global flag, one-way. Note that
2224 * while IPv4 would allow a per-interface flag, we expose the
2225 * same behaviour there and also propagate the setting from
2226 * one to all, to keep things simple (see above). */
2227
2228 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2229 if (r < 0)
2230 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2231
2232 return 0;
2233 }
2234
2235 static int link_set_ipv6_privacy_extensions(Link *link) {
2236 IPv6PrivacyExtensions s;
2237 int r;
2238
2239 s = link_ipv6_privacy_extensions(link);
2240 if (s < 0)
2241 return 0;
2242
2243 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2244 if (r < 0)
2245 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2246
2247 return 0;
2248 }
2249
2250 static int link_set_ipv6_accept_ra(Link *link) {
2251 int r;
2252
2253 /* Make this a NOP if IPv6 is not available */
2254 if (!socket_ipv6_is_supported())
2255 return 0;
2256
2257 if (link->flags & IFF_LOOPBACK)
2258 return 0;
2259
2260 if (!link->network)
2261 return 0;
2262
2263 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2264 if (r < 0)
2265 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2266
2267 return 0;
2268 }
2269
2270 static int link_set_ipv6_dad_transmits(Link *link) {
2271 int r;
2272
2273 /* Make this a NOP if IPv6 is not available */
2274 if (!socket_ipv6_is_supported())
2275 return 0;
2276
2277 if (link->flags & IFF_LOOPBACK)
2278 return 0;
2279
2280 if (!link->network)
2281 return 0;
2282
2283 if (link->network->ipv6_dad_transmits < 0)
2284 return 0;
2285
2286 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2287 if (r < 0)
2288 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2289
2290 return 0;
2291 }
2292
2293 static int link_set_ipv6_hop_limit(Link *link) {
2294 int r;
2295
2296 /* Make this a NOP if IPv6 is not available */
2297 if (!socket_ipv6_is_supported())
2298 return 0;
2299
2300 if (link->flags & IFF_LOOPBACK)
2301 return 0;
2302
2303 if (!link->network)
2304 return 0;
2305
2306 if (link->network->ipv6_hop_limit < 0)
2307 return 0;
2308
2309 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2310 if (r < 0)
2311 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2312
2313 return 0;
2314 }
2315
2316 static int link_set_ipv6_mtu(Link *link) {
2317 int r;
2318
2319 /* Make this a NOP if IPv6 is not available */
2320 if (!socket_ipv6_is_supported())
2321 return 0;
2322
2323 if (link->flags & IFF_LOOPBACK)
2324 return 0;
2325
2326 if (link->network->ipv6_mtu == 0)
2327 return 0;
2328
2329 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2330 if (r < 0)
2331 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2332
2333 return 0;
2334 }
2335
2336 static bool link_is_static_address_configured(Link *link, Address *address) {
2337 Address *net_address;
2338
2339 assert(link);
2340 assert(address);
2341
2342 if (!link->network)
2343 return false;
2344
2345 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2346 if (address_equal(net_address, address))
2347 return true;
2348
2349 return false;
2350 }
2351
2352 static bool link_is_neighbor_configured(Link *link, Neighbor *neighbor) {
2353 Neighbor *net_neighbor;
2354
2355 assert(link);
2356 assert(neighbor);
2357
2358 if (!link->network)
2359 return false;
2360
2361 LIST_FOREACH(neighbors, net_neighbor, link->network->neighbors)
2362 if (neighbor_equal(net_neighbor, neighbor))
2363 return true;
2364
2365 return false;
2366 }
2367
2368 static bool link_is_static_route_configured(Link *link, Route *route) {
2369 Route *net_route;
2370
2371 assert(link);
2372 assert(route);
2373
2374 if (!link->network)
2375 return false;
2376
2377 LIST_FOREACH(routes, net_route, link->network->static_routes)
2378 if (route_equal(net_route, route))
2379 return true;
2380
2381 return false;
2382 }
2383
2384 static bool link_address_is_dynamic(Link *link, Address *address) {
2385 Route *route;
2386 Iterator i;
2387
2388 assert(link);
2389 assert(address);
2390
2391 if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2392 return true;
2393
2394 /* Even when the address is leased from a DHCP server, networkd assign the address
2395 * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2396 * corresponding routes with RTPROT_DHCP. */
2397 SET_FOREACH(route, link->routes_foreign, i) {
2398 if (route->protocol != RTPROT_DHCP)
2399 continue;
2400
2401 if (address->family != route->family)
2402 continue;
2403
2404 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2405 return true;
2406 }
2407
2408 return false;
2409 }
2410
2411 static int link_drop_foreign_config(Link *link) {
2412 Address *address;
2413 Neighbor *neighbor;
2414 Route *route;
2415 Iterator i;
2416 int r;
2417
2418 SET_FOREACH(address, link->addresses_foreign, i) {
2419 /* we consider IPv6LL addresses to be managed by the kernel */
2420 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2421 continue;
2422
2423 if (link_address_is_dynamic(link, address)) {
2424 if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2425 continue;
2426 } else if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2427 continue;
2428
2429 if (link_is_static_address_configured(link, address)) {
2430 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2431 if (r < 0)
2432 return log_link_error_errno(link, r, "Failed to add address: %m");
2433 } else {
2434 r = address_remove(address, link, NULL);
2435 if (r < 0)
2436 return r;
2437 }
2438 }
2439
2440 SET_FOREACH(neighbor, link->neighbors_foreign, i) {
2441 if (link_is_neighbor_configured(link, neighbor)) {
2442 r = neighbor_add(link, neighbor->family, &neighbor->in_addr, &neighbor->lladdr, neighbor->lladdr_size, NULL);
2443 if (r < 0)
2444 return r;
2445 } else {
2446 r = neighbor_remove(neighbor, link, NULL);
2447 if (r < 0)
2448 return r;
2449 }
2450 }
2451
2452 SET_FOREACH(route, link->routes_foreign, i) {
2453 /* do not touch routes managed by the kernel */
2454 if (route->protocol == RTPROT_KERNEL)
2455 continue;
2456
2457 /* do not touch multicast route added by kernel */
2458 /* FIXME: Why the kernel adds this route with protocol RTPROT_BOOT??? We need to investigate that.
2459 * https://tools.ietf.org/html/rfc4862#section-5.4 may explain why. */
2460 if (route->protocol == RTPROT_BOOT &&
2461 route->family == AF_INET6 &&
2462 route->dst_prefixlen == 8 &&
2463 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 }}} }))
2464 continue;
2465
2466 if (route->protocol == RTPROT_STATIC &&
2467 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2468 continue;
2469
2470 if (route->protocol == RTPROT_DHCP &&
2471 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2472 continue;
2473
2474 if (link_is_static_route_configured(link, route)) {
2475 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, &route->gw, route->tos, route->priority, route->table, NULL);
2476 if (r < 0)
2477 return r;
2478 } else {
2479 r = route_remove(route, link, NULL);
2480 if (r < 0)
2481 return r;
2482 }
2483 }
2484
2485 return 0;
2486 }
2487
2488 static int link_drop_config(Link *link) {
2489 Address *address, *pool_address;
2490 Neighbor *neighbor;
2491 Route *route;
2492 Iterator i;
2493 int r;
2494
2495 SET_FOREACH(address, link->addresses, i) {
2496 /* we consider IPv6LL addresses to be managed by the kernel */
2497 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2498 continue;
2499
2500 r = address_remove(address, link, NULL);
2501 if (r < 0)
2502 return r;
2503
2504 /* If this address came from an address pool, clean up the pool */
2505 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2506 if (address_equal(address, pool_address)) {
2507 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2508 address_free(pool_address);
2509 break;
2510 }
2511 }
2512 }
2513
2514 SET_FOREACH(neighbor, link->neighbors, i) {
2515 r = neighbor_remove(neighbor, link, NULL);
2516 if (r < 0)
2517 return r;
2518 }
2519
2520 SET_FOREACH(route, link->routes, i) {
2521 /* do not touch routes managed by the kernel */
2522 if (route->protocol == RTPROT_KERNEL)
2523 continue;
2524
2525 r = route_remove(route, link, NULL);
2526 if (r < 0)
2527 return r;
2528 }
2529
2530 ndisc_flush(link);
2531
2532 return 0;
2533 }
2534
2535 static int link_configure(Link *link) {
2536 int r;
2537
2538 assert(link);
2539 assert(link->network);
2540 assert(link->state == LINK_STATE_INITIALIZED);
2541
2542 if (link->iftype == ARPHRD_CAN)
2543 return link_configure_can(link);
2544
2545 /* Drop foreign config, but ignore loopback or critical devices.
2546 * We do not want to remove loopback address or addresses used for root NFS. */
2547 if (!(link->flags & IFF_LOOPBACK) &&
2548 link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
2549 r = link_drop_foreign_config(link);
2550 if (r < 0)
2551 return r;
2552 }
2553
2554 /* If IPv6 configured that is static IPv6 address and IPv6LL autoconfiguration is enabled
2555 * for this interface, then enable IPv6 */
2556 (void) link_enable_ipv6(link);
2557
2558 r = link_set_proxy_arp(link);
2559 if (r < 0)
2560 return r;
2561
2562 r = ipv6_proxy_ndp_addresses_configure(link);
2563 if (r < 0)
2564 return r;
2565
2566 r = link_set_ipv4_forward(link);
2567 if (r < 0)
2568 return r;
2569
2570 r = link_set_ipv6_forward(link);
2571 if (r < 0)
2572 return r;
2573
2574 r = link_set_ipv6_privacy_extensions(link);
2575 if (r < 0)
2576 return r;
2577
2578 r = link_set_ipv6_accept_ra(link);
2579 if (r < 0)
2580 return r;
2581
2582 r = link_set_ipv6_dad_transmits(link);
2583 if (r < 0)
2584 return r;
2585
2586 r = link_set_ipv6_hop_limit(link);
2587 if (r < 0)
2588 return r;
2589
2590 r = link_set_flags(link);
2591 if (r < 0)
2592 return r;
2593
2594 r = link_set_ipv6_mtu(link);
2595 if (r < 0)
2596 return r;
2597
2598 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
2599 r = ipv4ll_configure(link);
2600 if (r < 0)
2601 return r;
2602 }
2603
2604 if (link_dhcp4_enabled(link)) {
2605 r = dhcp4_set_promote_secondaries(link);
2606 if (r < 0)
2607 return r;
2608
2609 r = dhcp4_configure(link);
2610 if (r < 0)
2611 return r;
2612 }
2613
2614 if (link_dhcp4_server_enabled(link)) {
2615 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2616 if (r < 0)
2617 return r;
2618
2619 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2620 if (r < 0)
2621 return r;
2622 }
2623
2624 if (link_dhcp6_enabled(link) ||
2625 link_ipv6_accept_ra_enabled(link)) {
2626 r = dhcp6_configure(link);
2627 if (r < 0)
2628 return r;
2629 }
2630
2631 if (link_ipv6_accept_ra_enabled(link)) {
2632 r = ndisc_configure(link);
2633 if (r < 0)
2634 return r;
2635 }
2636
2637 if (link_radv_enabled(link)) {
2638 r = radv_configure(link);
2639 if (r < 0)
2640 return r;
2641 }
2642
2643 if (link_lldp_rx_enabled(link)) {
2644 r = link_lldp_rx_configure(link);
2645 if (r < 0)
2646 return r;
2647 }
2648
2649 r = link_configure_mtu(link);
2650 if (r < 0)
2651 return r;
2652
2653 r = link_configure_addrgen_mode(link);
2654 if (r < 0)
2655 return r;
2656
2657 return link_configure_after_setting_mtu(link);
2658 }
2659
2660 static int link_configure_after_setting_mtu(Link *link) {
2661 int r;
2662
2663 assert(link);
2664 assert(link->network);
2665 assert(link->state == LINK_STATE_INITIALIZED);
2666
2667 if (link->setting_mtu)
2668 return 0;
2669
2670 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2671 r = link_acquire_conf(link);
2672 if (r < 0)
2673 return r;
2674 }
2675
2676 return link_enter_join_netdev(link);
2677 }
2678
2679 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
2680 assert(duid);
2681
2682 if (duid->raw_data_len > 0)
2683 return 0;
2684
2685 if (duid->type != DUID_TYPE_UUID)
2686 return -EINVAL;
2687
2688 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
2689 duid->raw_data_len = sizeof(sd_id128_t);
2690
2691 return 1;
2692 }
2693
2694 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
2695 Manager *manager = userdata;
2696 const sd_bus_error *e;
2697 const void *a;
2698 size_t sz;
2699 DUID *duid;
2700 Link *link;
2701 int r;
2702
2703 assert(m);
2704 assert(manager);
2705
2706 e = sd_bus_message_get_error(m);
2707 if (e) {
2708 log_error_errno(sd_bus_error_get_errno(e),
2709 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
2710 e->message);
2711 goto configure;
2712 }
2713
2714 r = sd_bus_message_read_array(m, 'y', &a, &sz);
2715 if (r < 0)
2716 goto configure;
2717
2718 if (sz != sizeof(sd_id128_t)) {
2719 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
2720 goto configure;
2721 }
2722
2723 memcpy(&manager->product_uuid, a, sz);
2724 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
2725 (void) duid_set_uuid(duid, manager->product_uuid);
2726
2727 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
2728
2729 configure:
2730 while ((link = set_steal_first(manager->links_requesting_uuid))) {
2731 link_unref(link);
2732
2733 r = link_configure(link);
2734 if (r < 0)
2735 link_enter_failed(link);
2736 }
2737
2738 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
2739
2740 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
2741 * even if the method fails. */
2742 manager->has_product_uuid = true;
2743
2744 return 1;
2745 }
2746
2747 static bool link_requires_uuid(Link *link) {
2748 const DUID *duid;
2749
2750 assert(link);
2751 assert(link->manager);
2752 assert(link->network);
2753
2754 duid = link_get_duid(link);
2755 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
2756 return false;
2757
2758 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
2759 return true;
2760
2761 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
2762 return true;
2763
2764 return false;
2765 }
2766
2767 static int link_configure_duid(Link *link) {
2768 Manager *m;
2769 DUID *duid;
2770 int r;
2771
2772 assert(link);
2773 assert(link->manager);
2774 assert(link->network);
2775
2776 m = link->manager;
2777 duid = link_get_duid(link);
2778
2779 if (!link_requires_uuid(link))
2780 return 1;
2781
2782 if (m->has_product_uuid) {
2783 (void) duid_set_uuid(duid, m->product_uuid);
2784 return 1;
2785 }
2786
2787 if (!m->links_requesting_uuid) {
2788 r = manager_request_product_uuid(m, link);
2789 if (r < 0) {
2790 if (r == -ENOMEM)
2791 return r;
2792
2793 log_link_warning_errno(link, r,
2794 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
2795 return 1;
2796 }
2797 } else {
2798 r = set_put(m->links_requesting_uuid, link);
2799 if (r < 0)
2800 return log_oom();
2801
2802 r = set_put(m->duids_requesting_uuid, duid);
2803 if (r < 0)
2804 return log_oom();
2805
2806 link_ref(link);
2807 }
2808
2809 return 0;
2810 }
2811
2812 static int link_initialized_and_synced(Link *link) {
2813 Network *network;
2814 int r;
2815
2816 assert(link);
2817 assert(link->ifname);
2818 assert(link->manager);
2819
2820 /* We may get called either from the asynchronous netlink callback,
2821 * or directly for link_add() if running in a container. See link_add(). */
2822 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
2823 return 0;
2824
2825 log_link_debug(link, "Link state is up-to-date");
2826 link_set_state(link, LINK_STATE_INITIALIZED);
2827
2828 r = link_new_bound_by_list(link);
2829 if (r < 0)
2830 return r;
2831
2832 r = link_handle_bound_by_list(link);
2833 if (r < 0)
2834 return r;
2835
2836 if (!link->network) {
2837 r = network_get(link->manager, link->sd_device, link->ifname,
2838 &link->mac, &network);
2839 if (r == -ENOENT) {
2840 link_enter_unmanaged(link);
2841 return 0;
2842 } else if (r == 0 && network->unmanaged) {
2843 link_enter_unmanaged(link);
2844 return 0;
2845 } else if (r < 0)
2846 return r;
2847
2848 if (link->flags & IFF_LOOPBACK) {
2849 if (network->link_local != ADDRESS_FAMILY_NO)
2850 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2851
2852 if (network->dhcp != ADDRESS_FAMILY_NO)
2853 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2854
2855 if (network->dhcp_server)
2856 log_link_debug(link, "Ignoring DHCP server for loopback link");
2857 }
2858
2859 r = network_apply(network, link);
2860 if (r < 0)
2861 return r;
2862 }
2863
2864 r = link_new_bound_to_list(link);
2865 if (r < 0)
2866 return r;
2867
2868 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
2869 * link_configure() is called later asynchronously. */
2870 r = link_configure_duid(link);
2871 if (r <= 0)
2872 return r;
2873
2874 r = link_configure(link);
2875 if (r < 0)
2876 return r;
2877
2878 return 0;
2879 }
2880
2881 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2882 int r;
2883
2884 r = link_initialized_and_synced(link);
2885 if (r < 0)
2886 link_enter_failed(link);
2887 return 1;
2888 }
2889
2890 int link_initialized(Link *link, sd_device *device) {
2891 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2892 int r;
2893
2894 assert(link);
2895 assert(link->manager);
2896 assert(link->manager->rtnl);
2897 assert(device);
2898
2899 if (link->state != LINK_STATE_PENDING)
2900 return 0;
2901
2902 if (link->sd_device)
2903 return 0;
2904
2905 log_link_debug(link, "udev initialized link");
2906 link_set_state(link, LINK_STATE_INITIALIZED);
2907
2908 link->sd_device = sd_device_ref(device);
2909
2910 /* udev has initialized the link, but we don't know if we have yet
2911 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2912 * when it returns we know that the pending NEWLINKs have already been
2913 * processed and that we are up-to-date */
2914
2915 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2916 link->ifindex);
2917 if (r < 0)
2918 return r;
2919
2920 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
2921 link_netlink_destroy_callback, link);
2922 if (r < 0)
2923 return r;
2924
2925 link_ref(link);
2926
2927 return 0;
2928 }
2929
2930 static int link_load(Link *link) {
2931 _cleanup_free_ char *network_file = NULL,
2932 *addresses = NULL,
2933 *routes = NULL,
2934 *dhcp4_address = NULL,
2935 *ipv4ll_address = NULL;
2936 union in_addr_union address;
2937 union in_addr_union route_dst;
2938 const char *p;
2939 int r;
2940
2941 assert(link);
2942
2943 r = parse_env_file(NULL, link->state_file,
2944 "NETWORK_FILE", &network_file,
2945 "ADDRESSES", &addresses,
2946 "ROUTES", &routes,
2947 "DHCP4_ADDRESS", &dhcp4_address,
2948 "IPV4LL_ADDRESS", &ipv4ll_address);
2949 if (r < 0 && r != -ENOENT)
2950 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
2951
2952 if (network_file) {
2953 Network *network;
2954 char *suffix;
2955
2956 /* drop suffix */
2957 suffix = strrchr(network_file, '.');
2958 if (!suffix) {
2959 log_link_debug(link, "Failed to get network name from %s", network_file);
2960 goto network_file_fail;
2961 }
2962 *suffix = '\0';
2963
2964 r = network_get_by_name(link->manager, basename(network_file), &network);
2965 if (r < 0) {
2966 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
2967 goto network_file_fail;
2968 }
2969
2970 r = network_apply(network, link);
2971 if (r < 0)
2972 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
2973 }
2974
2975 network_file_fail:
2976
2977 if (addresses) {
2978 p = addresses;
2979
2980 for (;;) {
2981 _cleanup_free_ char *address_str = NULL;
2982 char *prefixlen_str;
2983 int family;
2984 unsigned char prefixlen;
2985
2986 r = extract_first_word(&p, &address_str, NULL, 0);
2987 if (r < 0) {
2988 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
2989 continue;
2990 }
2991 if (r == 0)
2992 break;
2993
2994 prefixlen_str = strchr(address_str, '/');
2995 if (!prefixlen_str) {
2996 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
2997 continue;
2998 }
2999
3000 *prefixlen_str++ = '\0';
3001
3002 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3003 if (r != 1) {
3004 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3005 continue;
3006 }
3007
3008 r = in_addr_from_string_auto(address_str, &family, &address);
3009 if (r < 0) {
3010 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3011 continue;
3012 }
3013
3014 r = address_add(link, family, &address, prefixlen, NULL);
3015 if (r < 0)
3016 return log_link_error_errno(link, r, "Failed to add address: %m");
3017 }
3018 }
3019
3020 if (routes) {
3021 p = routes;
3022
3023 for (;;) {
3024 Route *route;
3025 _cleanup_free_ char *route_str = NULL;
3026 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3027 usec_t lifetime;
3028 char *prefixlen_str;
3029 int family;
3030 unsigned char prefixlen, tos, table;
3031 uint32_t priority;
3032
3033 r = extract_first_word(&p, &route_str, NULL, 0);
3034 if (r < 0) {
3035 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3036 continue;
3037 }
3038 if (r == 0)
3039 break;
3040
3041 prefixlen_str = strchr(route_str, '/');
3042 if (!prefixlen_str) {
3043 log_link_debug(link, "Failed to parse route %s", route_str);
3044 continue;
3045 }
3046
3047 *prefixlen_str++ = '\0';
3048
3049 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3050 if (r != 5) {
3051 log_link_debug(link,
3052 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3053 prefixlen_str);
3054 continue;
3055 }
3056
3057 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3058 if (r < 0) {
3059 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3060 continue;
3061 }
3062
3063 r = route_add(link, family, &route_dst, prefixlen, NULL, tos, priority, table, &route);
3064 if (r < 0)
3065 return log_link_error_errno(link, r, "Failed to add route: %m");
3066
3067 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3068 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3069 0, route_expire_handler, route);
3070 if (r < 0)
3071 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3072 }
3073
3074 route->lifetime = lifetime;
3075 sd_event_source_unref(route->expire);
3076 route->expire = TAKE_PTR(expire);
3077 }
3078 }
3079
3080 if (dhcp4_address) {
3081 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3082 if (r < 0) {
3083 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3084 goto dhcp4_address_fail;
3085 }
3086
3087 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3088 if (r < 0)
3089 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3090
3091 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3092 if (r < 0)
3093 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3094 }
3095
3096 dhcp4_address_fail:
3097
3098 if (ipv4ll_address) {
3099 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3100 if (r < 0) {
3101 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3102 goto ipv4ll_address_fail;
3103 }
3104
3105 r = sd_ipv4ll_new(&link->ipv4ll);
3106 if (r < 0)
3107 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3108
3109 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3110 if (r < 0)
3111 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3112 }
3113
3114 ipv4ll_address_fail:
3115
3116 return 0;
3117 }
3118
3119 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3120 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3121 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3122 Link *link;
3123 int r;
3124
3125 assert(m);
3126 assert(m->rtnl);
3127 assert(message);
3128 assert(ret);
3129
3130 r = link_new(m, message, ret);
3131 if (r < 0)
3132 return r;
3133
3134 link = *ret;
3135
3136 log_link_debug(link, "Link %d added", link->ifindex);
3137
3138 r = link_load(link);
3139 if (r < 0)
3140 return r;
3141
3142 if (detect_container() <= 0) {
3143 /* not in a container, udev will be around */
3144 sprintf(ifindex_str, "n%d", link->ifindex);
3145 r = sd_device_new_from_device_id(&device, ifindex_str);
3146 if (r < 0) {
3147 log_link_warning_errno(link, r, "Could not find device: %m");
3148 goto failed;
3149 }
3150
3151 r = sd_device_get_is_initialized(device);
3152 if (r < 0) {
3153 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3154 goto failed;
3155 }
3156 if (r == 0) {
3157 /* not yet ready */
3158 log_link_debug(link, "link pending udev initialization...");
3159 return 0;
3160 }
3161
3162 r = device_is_renaming(device);
3163 if (r < 0) {
3164 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3165 goto failed;
3166 }
3167 if (r > 0) {
3168 log_link_debug(link, "Interface is under renaming, pending initialization.");
3169 return 0;
3170 }
3171
3172 r = link_initialized(link, device);
3173 if (r < 0)
3174 goto failed;
3175 } else {
3176 r = link_initialized_and_synced(link);
3177 if (r < 0)
3178 goto failed;
3179 }
3180
3181 return 0;
3182 failed:
3183 link_enter_failed(link);
3184 return r;
3185 }
3186
3187 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3188 int r;
3189
3190 assert(link);
3191
3192 log_link_info(link, "Gained IPv6LL");
3193
3194 link->ipv6ll_address = *address;
3195 link_check_ready(link);
3196
3197 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3198 r = link_acquire_ipv6_conf(link);
3199 if (r < 0) {
3200 link_enter_failed(link);
3201 return r;
3202 }
3203 }
3204
3205 return 0;
3206 }
3207
3208 static int link_carrier_gained(Link *link) {
3209 int r;
3210
3211 assert(link);
3212
3213 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3214 r = link_acquire_conf(link);
3215 if (r < 0) {
3216 link_enter_failed(link);
3217 return r;
3218 }
3219
3220 link_set_state(link, LINK_STATE_CONFIGURING);
3221 r = link_request_set_addresses(link);
3222 if (r < 0)
3223 return r;
3224 }
3225
3226 r = link_handle_bound_by_list(link);
3227 if (r < 0)
3228 return r;
3229
3230 return 0;
3231 }
3232
3233 static int link_carrier_lost(Link *link) {
3234 int r;
3235
3236 assert(link);
3237
3238 if (link->network && link->network->ignore_carrier_loss)
3239 return 0;
3240
3241 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3242 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3243 * configuration and stop the clients as well. */
3244 if (link->setting_mtu)
3245 return 0;
3246
3247 r = link_stop_clients(link, false);
3248 if (r < 0) {
3249 link_enter_failed(link);
3250 return r;
3251 }
3252
3253 if (link_dhcp4_server_enabled(link))
3254 (void) sd_dhcp_server_stop(link->dhcp_server);
3255
3256 r = link_drop_config(link);
3257 if (r < 0)
3258 return r;
3259
3260 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3261 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3262 r = link_drop_foreign_config(link);
3263 if (r < 0)
3264 return r;
3265 }
3266
3267 r = link_handle_bound_by_list(link);
3268 if (r < 0)
3269 return r;
3270
3271 return 0;
3272 }
3273
3274 int link_carrier_reset(Link *link) {
3275 int r;
3276
3277 assert(link);
3278
3279 if (link_has_carrier(link)) {
3280 r = link_carrier_lost(link);
3281 if (r < 0)
3282 return r;
3283
3284 r = link_carrier_gained(link);
3285 if (r < 0)
3286 return r;
3287
3288 log_link_info(link, "Reset carrier");
3289 }
3290
3291 return 0;
3292 }
3293
3294 int link_update(Link *link, sd_netlink_message *m) {
3295 struct ether_addr mac;
3296 const char *ifname;
3297 uint32_t mtu;
3298 bool had_carrier, carrier_gained, carrier_lost;
3299 int old_master, r;
3300
3301 assert(link);
3302 assert(link->ifname);
3303 assert(m);
3304
3305 if (link->state == LINK_STATE_LINGER) {
3306 log_link_info(link, "Link re-added");
3307 link_set_state(link, LINK_STATE_CONFIGURING);
3308
3309 r = link_new_carrier_maps(link);
3310 if (r < 0)
3311 return r;
3312 }
3313
3314 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3315 if (r >= 0 && !streq(ifname, link->ifname)) {
3316 Manager *manager = link->manager;
3317
3318 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3319
3320 link_drop(link);
3321 r = link_add(manager, m, &link);
3322 if (r < 0)
3323 return r;
3324 }
3325
3326 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3327 if (r >= 0 && mtu > 0) {
3328 link->mtu = mtu;
3329 if (link->original_mtu == 0) {
3330 link->original_mtu = mtu;
3331 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3332 }
3333
3334 if (link->dhcp_client) {
3335 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3336 link->mtu);
3337 if (r < 0)
3338 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3339 }
3340
3341 if (link->radv) {
3342 r = sd_radv_set_mtu(link->radv, link->mtu);
3343 if (r < 0)
3344 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3345 }
3346 }
3347
3348 /* The kernel may broadcast NEWLINK messages without the MAC address
3349 set, simply ignore them. */
3350 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3351 if (r >= 0) {
3352 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3353 ETH_ALEN)) {
3354
3355 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3356 ETH_ALEN);
3357
3358 log_link_debug(link, "MAC address: "
3359 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3360 mac.ether_addr_octet[0],
3361 mac.ether_addr_octet[1],
3362 mac.ether_addr_octet[2],
3363 mac.ether_addr_octet[3],
3364 mac.ether_addr_octet[4],
3365 mac.ether_addr_octet[5]);
3366
3367 if (link->ipv4ll) {
3368 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3369 if (r < 0)
3370 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3371 }
3372
3373 if (link->dhcp_client) {
3374 r = sd_dhcp_client_set_mac(link->dhcp_client,
3375 (const uint8_t *) &link->mac,
3376 sizeof (link->mac),
3377 ARPHRD_ETHER);
3378 if (r < 0)
3379 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3380
3381 r = dhcp4_set_client_identifier(link);
3382 if (r < 0)
3383 return r;
3384 }
3385
3386 if (link->dhcp6_client) {
3387 const DUID* duid = link_get_duid(link);
3388
3389 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3390 (const uint8_t *) &link->mac,
3391 sizeof (link->mac),
3392 ARPHRD_ETHER);
3393 if (r < 0)
3394 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3395
3396 if (link->network->iaid_set) {
3397 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3398 link->network->iaid);
3399 if (r < 0)
3400 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3401 }
3402
3403 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3404 duid->type,
3405 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3406 duid->raw_data_len);
3407 if (r < 0)
3408 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3409 }
3410
3411 if (link->radv) {
3412 r = sd_radv_set_mac(link->radv, &link->mac);
3413 if (r < 0)
3414 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3415 }
3416
3417 if (link->ndisc) {
3418 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3419 if (r < 0)
3420 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3421 }
3422 }
3423 }
3424
3425 old_master = link->master_ifindex;
3426 (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
3427
3428 had_carrier = link_has_carrier(link);
3429
3430 r = link_update_flags(link, m, old_master != link->master_ifindex);
3431 if (r < 0)
3432 return r;
3433
3434 r = link_update_lldp(link);
3435 if (r < 0)
3436 return r;
3437
3438 carrier_gained = !had_carrier && link_has_carrier(link);
3439 carrier_lost = had_carrier && !link_has_carrier(link);
3440
3441 if (carrier_gained) {
3442 log_link_info(link, "Gained carrier");
3443
3444 r = link_carrier_gained(link);
3445 if (r < 0)
3446 return r;
3447 } else if (carrier_lost) {
3448 log_link_info(link, "Lost carrier");
3449
3450 r = link_carrier_lost(link);
3451 if (r < 0)
3452 return r;
3453 }
3454
3455 return 0;
3456 }
3457
3458 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3459 bool space = false;
3460 Iterator i;
3461 Link *link;
3462
3463 assert(f);
3464 assert(prefix);
3465
3466 if (hashmap_isempty(h))
3467 return;
3468
3469 fputs(prefix, f);
3470 HASHMAP_FOREACH(link, h, i) {
3471 if (space)
3472 fputc(' ', f);
3473
3474 fprintf(f, "%i", link->ifindex);
3475 space = true;
3476 }
3477
3478 fputc('\n', f);
3479 }
3480
3481 static void link_save_dns(FILE *f, struct in_addr_data *dns, unsigned n_dns, bool *space) {
3482 unsigned j;
3483 int r;
3484
3485 for (j = 0; j < n_dns; j++) {
3486 _cleanup_free_ char *b = NULL;
3487
3488 r = in_addr_to_string(dns[j].family, &dns[j].address, &b);
3489 if (r < 0) {
3490 log_debug_errno(r, "Failed to format address, ignoring: %m");
3491 continue;
3492 }
3493
3494 if (*space)
3495 fputc(' ', f);
3496 fputs(b, f);
3497 *space = true;
3498 }
3499 }
3500
3501 int link_save(Link *link) {
3502 _cleanup_free_ char *temp_path = NULL;
3503 _cleanup_fclose_ FILE *f = NULL;
3504 const char *admin_state, *oper_state, *carrier_state, *address_state;
3505 Address *a;
3506 Route *route;
3507 Iterator i;
3508 int r;
3509
3510 assert(link);
3511 assert(link->state_file);
3512 assert(link->lease_file);
3513 assert(link->manager);
3514
3515 if (link->state == LINK_STATE_LINGER) {
3516 (void) unlink(link->state_file);
3517 return 0;
3518 }
3519
3520 link_lldp_save(link);
3521
3522 admin_state = link_state_to_string(link->state);
3523 assert(admin_state);
3524
3525 oper_state = link_operstate_to_string(link->operstate);
3526 assert(oper_state);
3527
3528 carrier_state = link_carrier_state_to_string(link->carrier_state);
3529 assert(carrier_state);
3530
3531 address_state = link_address_state_to_string(link->address_state);
3532 assert(address_state);
3533
3534 r = fopen_temporary(link->state_file, &f, &temp_path);
3535 if (r < 0)
3536 goto fail;
3537
3538 (void) fchmod(fileno(f), 0644);
3539
3540 fprintf(f,
3541 "# This is private data. Do not parse.\n"
3542 "ADMIN_STATE=%s\n"
3543 "OPER_STATE=%s\n"
3544 "CARRIER_STATE=%s\n"
3545 "ADDRESS_STATE=%s\n",
3546 admin_state, oper_state, carrier_state, address_state);
3547
3548 if (link->network) {
3549 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
3550 const char *dhcp_domainname = NULL, *p;
3551 sd_dhcp6_lease *dhcp6_lease = NULL;
3552 bool space;
3553
3554 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3555 yes_no(link->network->required_for_online));
3556
3557 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
3558 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
3559
3560 if (link->dhcp6_client) {
3561 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3562 if (r < 0 && r != -ENOMSG)
3563 log_link_debug(link, "No DHCPv6 lease");
3564 }
3565
3566 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3567
3568 fputs("DNS=", f);
3569 space = false;
3570
3571 if (link->n_dns != (unsigned) -1)
3572 link_save_dns(f, link->dns, link->n_dns, &space);
3573 else
3574 link_save_dns(f, link->network->dns, link->network->n_dns, &space);
3575
3576 if (link->network->dhcp_use_dns &&
3577 link->dhcp_lease) {
3578 const struct in_addr *addresses;
3579
3580 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3581 if (r > 0)
3582 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3583 space = true;
3584 }
3585
3586 if (link->network->dhcp6_use_dns && dhcp6_lease) {
3587 struct in6_addr *in6_addrs;
3588
3589 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3590 if (r > 0) {
3591 if (space)
3592 fputc(' ', f);
3593 serialize_in6_addrs(f, in6_addrs, r);
3594 space = true;
3595 }
3596 }
3597
3598 /* Make sure to flush out old entries before we use the NDISC data */
3599 ndisc_vacuum(link);
3600
3601 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3602 NDiscRDNSS *dd;
3603
3604 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3605 if (space)
3606 fputc(' ', f);
3607
3608 serialize_in6_addrs(f, &dd->address, 1);
3609 space = true;
3610 }
3611 }
3612
3613 fputc('\n', f);
3614
3615 fputs("NTP=", f);
3616 space = false;
3617 fputstrv(f, link->ntp ?: link->network->ntp, NULL, &space);
3618
3619 if (link->network->dhcp_use_ntp &&
3620 link->dhcp_lease) {
3621 const struct in_addr *addresses;
3622
3623 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3624 if (r > 0)
3625 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3626 space = true;
3627 }
3628
3629 if (link->network->dhcp6_use_ntp && dhcp6_lease) {
3630 struct in6_addr *in6_addrs;
3631 char **hosts;
3632
3633 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3634 &in6_addrs);
3635 if (r > 0) {
3636 if (space)
3637 fputc(' ', f);
3638 serialize_in6_addrs(f, in6_addrs, r);
3639 space = true;
3640 }
3641
3642 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3643 if (r > 0)
3644 fputstrv(f, hosts, NULL, &space);
3645 }
3646
3647 fputc('\n', f);
3648
3649 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3650 if (link->dhcp_lease) {
3651 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3652 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3653 }
3654 if (dhcp6_lease)
3655 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3656 }
3657
3658 fputs("DOMAINS=", f);
3659 space = false;
3660 ORDERED_SET_FOREACH(p, link->search_domains ?: link->network->search_domains, i)
3661 fputs_with_space(f, p, NULL, &space);
3662
3663 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3664 if (dhcp_domainname)
3665 fputs_with_space(f, dhcp_domainname, NULL, &space);
3666 if (dhcp_domains)
3667 fputstrv(f, dhcp_domains, NULL, &space);
3668 if (dhcp6_domains)
3669 fputstrv(f, dhcp6_domains, NULL, &space);
3670 }
3671
3672 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_YES) {
3673 NDiscDNSSL *dd;
3674
3675 SET_FOREACH(dd, link->ndisc_dnssl, i)
3676 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3677 }
3678
3679 fputc('\n', f);
3680
3681 fputs("ROUTE_DOMAINS=", f);
3682 space = false;
3683 ORDERED_SET_FOREACH(p, link->route_domains ?: link->network->route_domains, i)
3684 fputs_with_space(f, p, NULL, &space);
3685
3686 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3687 if (dhcp_domainname)
3688 fputs_with_space(f, dhcp_domainname, NULL, &space);
3689 if (dhcp_domains)
3690 fputstrv(f, dhcp_domains, NULL, &space);
3691 if (dhcp6_domains)
3692 fputstrv(f, dhcp6_domains, NULL, &space);
3693 }
3694
3695 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3696 NDiscDNSSL *dd;
3697
3698 SET_FOREACH(dd, link->ndisc_dnssl, i)
3699 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3700 }
3701
3702 fputc('\n', f);
3703
3704 fprintf(f, "LLMNR=%s\n",
3705 resolve_support_to_string(link->llmnr >= 0 ? link->llmnr : link->network->llmnr));
3706 fprintf(f, "MDNS=%s\n",
3707 resolve_support_to_string(link->mdns >= 0 ? link->mdns : link->network->mdns));
3708 if (link->dns_default_route >= 0)
3709 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->dns_default_route));
3710 else if (link->network->dns_default_route >= 0)
3711 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
3712
3713 if (link->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3714 fprintf(f, "DNS_OVER_TLS=%s\n",
3715 dns_over_tls_mode_to_string(link->dns_over_tls_mode));
3716 else if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3717 fprintf(f, "DNS_OVER_TLS=%s\n",
3718 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
3719
3720 if (link->dnssec_mode != _DNSSEC_MODE_INVALID)
3721 fprintf(f, "DNSSEC=%s\n",
3722 dnssec_mode_to_string(link->dnssec_mode));
3723 else if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3724 fprintf(f, "DNSSEC=%s\n",
3725 dnssec_mode_to_string(link->network->dnssec_mode));
3726
3727 if (!set_isempty(link->dnssec_negative_trust_anchors)) {
3728 const char *n;
3729
3730 fputs("DNSSEC_NTA=", f);
3731 space = false;
3732 SET_FOREACH(n, link->dnssec_negative_trust_anchors, i)
3733 fputs_with_space(f, n, NULL, &space);
3734 fputc('\n', f);
3735 } else if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3736 const char *n;
3737
3738 fputs("DNSSEC_NTA=", f);
3739 space = false;
3740 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3741 fputs_with_space(f, n, NULL, &space);
3742 fputc('\n', f);
3743 }
3744
3745 fputs("ADDRESSES=", f);
3746 space = false;
3747 SET_FOREACH(a, link->addresses, i) {
3748 _cleanup_free_ char *address_str = NULL;
3749
3750 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3751 if (r < 0)
3752 goto fail;
3753
3754 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3755 space = true;
3756 }
3757 fputc('\n', f);
3758
3759 fputs("ROUTES=", f);
3760 space = false;
3761 SET_FOREACH(route, link->routes, i) {
3762 _cleanup_free_ char *route_str = NULL;
3763
3764 r = in_addr_to_string(route->family, &route->dst, &route_str);
3765 if (r < 0)
3766 goto fail;
3767
3768 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
3769 space ? " " : "", route_str,
3770 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3771 space = true;
3772 }
3773
3774 fputc('\n', f);
3775 }
3776
3777 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3778 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3779
3780 if (link->dhcp_lease) {
3781 struct in_addr address;
3782 const char *tz = NULL;
3783
3784 assert(link->network);
3785
3786 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3787 if (r >= 0)
3788 fprintf(f, "TIMEZONE=%s\n", tz);
3789
3790 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3791 if (r >= 0) {
3792 fputs("DHCP4_ADDRESS=", f);
3793 serialize_in_addrs(f, &address, 1, false, NULL);
3794 fputc('\n', f);
3795 }
3796
3797 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3798 if (r < 0)
3799 goto fail;
3800
3801 fprintf(f,
3802 "DHCP_LEASE=%s\n",
3803 link->lease_file);
3804 } else
3805 (void) unlink(link->lease_file);
3806
3807 if (link->ipv4ll) {
3808 struct in_addr address;
3809
3810 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3811 if (r >= 0) {
3812 fputs("IPV4LL_ADDRESS=", f);
3813 serialize_in_addrs(f, &address, 1, false, NULL);
3814 fputc('\n', f);
3815 }
3816 }
3817
3818 r = fflush_and_check(f);
3819 if (r < 0)
3820 goto fail;
3821
3822 if (rename(temp_path, link->state_file) < 0) {
3823 r = -errno;
3824 goto fail;
3825 }
3826
3827 return 0;
3828
3829 fail:
3830 (void) unlink(link->state_file);
3831 if (temp_path)
3832 (void) unlink(temp_path);
3833
3834 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3835 }
3836
3837 /* The serialized state in /run is no longer up-to-date. */
3838 void link_dirty(Link *link) {
3839 int r;
3840
3841 assert(link);
3842
3843 /* mark manager dirty as link is dirty */
3844 manager_dirty(link->manager);
3845
3846 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3847 if (r < 0)
3848 /* allocation errors are ignored */
3849 return;
3850
3851 r = set_put(link->manager->dirty_links, link);
3852 if (r <= 0)
3853 /* don't take another ref if the link was already dirty */
3854 return;
3855
3856 link_ref(link);
3857 }
3858
3859 /* The serialized state in /run is up-to-date */
3860 void link_clean(Link *link) {
3861 assert(link);
3862 assert(link->manager);
3863
3864 link_unref(set_remove(link->manager->dirty_links, link));
3865 }
3866
3867 static const char* const link_state_table[_LINK_STATE_MAX] = {
3868 [LINK_STATE_PENDING] = "pending",
3869 [LINK_STATE_INITIALIZED] = "initialized",
3870 [LINK_STATE_CONFIGURING] = "configuring",
3871 [LINK_STATE_CONFIGURED] = "configured",
3872 [LINK_STATE_UNMANAGED] = "unmanaged",
3873 [LINK_STATE_FAILED] = "failed",
3874 [LINK_STATE_LINGER] = "linger",
3875 };
3876
3877 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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