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Merge pull request #12762 from yuwata/network-introduce-carrier-and-network-state...
[thirdparty/systemd.git] / src / network / networkd-link.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <netinet/in.h>
4 #include <linux/if.h>
5 #include <unistd.h>
6
7 #include "alloc-util.h"
8 #include "bus-util.h"
9 #include "dhcp-identifier.h"
10 #include "dhcp-lease-internal.h"
11 #include "env-file.h"
12 #include "fd-util.h"
13 #include "fileio.h"
14 #include "missing_network.h"
15 #include "netdev/bond.h"
16 #include "netdev/bridge.h"
17 #include "netdev/ipvlan.h"
18 #include "netdev/vrf.h"
19 #include "netlink-util.h"
20 #include "network-internal.h"
21 #include "networkd-can.h"
22 #include "networkd-ipv6-proxy-ndp.h"
23 #include "networkd-link-bus.h"
24 #include "networkd-link.h"
25 #include "networkd-lldp-tx.h"
26 #include "networkd-manager.h"
27 #include "networkd-ndisc.h"
28 #include "networkd-neighbor.h"
29 #include "networkd-radv.h"
30 #include "networkd-routing-policy-rule.h"
31 #include "set.h"
32 #include "socket-util.h"
33 #include "stdio-util.h"
34 #include "string-table.h"
35 #include "strv.h"
36 #include "sysctl-util.h"
37 #include "tmpfile-util.h"
38 #include "udev-util.h"
39 #include "util.h"
40 #include "virt.h"
41
42 uint32_t link_get_vrf_table(Link *link) {
43 return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
44 }
45
46 uint32_t link_get_dhcp_route_table(Link *link) {
47 /* When the interface is part of an VRF use the VRFs routing table, unless
48 * another table is explicitly specified. */
49 if (link->network->dhcp_route_table_set)
50 return link->network->dhcp_route_table;
51 return link_get_vrf_table(link);
52 }
53
54 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
55 if (link->network->ipv6_accept_ra_route_table_set)
56 return link->network->ipv6_accept_ra_route_table;
57 return link_get_vrf_table(link);
58 }
59
60 DUID* link_get_duid(Link *link) {
61 if (link->network->duid.type != _DUID_TYPE_INVALID)
62 return &link->network->duid;
63 else
64 return &link->manager->duid;
65 }
66
67 int link_sysctl_ipv6_enabled(Link *link) {
68 _cleanup_free_ char *value = NULL;
69 int r;
70
71 r = sysctl_read_ip_property(AF_INET6, link->ifname, "disable_ipv6", &value);
72 if (r < 0)
73 return log_link_warning_errno(link, r,
74 "Failed to read net.ipv6.conf.%s.disable_ipv6 sysctl property: %m",
75 link->ifname);
76
77 link->sysctl_ipv6_enabled = value[0] == '0';
78 return link->sysctl_ipv6_enabled;
79 }
80
81 static bool link_dhcp6_enabled(Link *link) {
82 assert(link);
83
84 if (!socket_ipv6_is_supported())
85 return false;
86
87 if (link->flags & IFF_LOOPBACK)
88 return false;
89
90 if (!link->network)
91 return false;
92
93 if (link->network->bond)
94 return false;
95
96 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
97 return false;
98
99 if (link_sysctl_ipv6_enabled(link) == 0)
100 return false;
101
102 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
103 }
104
105 static bool link_dhcp4_enabled(Link *link) {
106 assert(link);
107
108 if (link->flags & IFF_LOOPBACK)
109 return false;
110
111 if (!link->network)
112 return false;
113
114 if (link->network->bond)
115 return false;
116
117 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
118 return false;
119
120 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
121 }
122
123 static bool link_dhcp4_server_enabled(Link *link) {
124 assert(link);
125
126 if (link->flags & IFF_LOOPBACK)
127 return false;
128
129 if (!link->network)
130 return false;
131
132 if (link->network->bond)
133 return false;
134
135 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
136 return false;
137
138 return link->network->dhcp_server;
139 }
140
141 bool link_ipv4ll_enabled(Link *link, AddressFamilyBoolean mask) {
142 assert(link);
143 assert((mask & ~(ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) == 0);
144
145 if (link->flags & IFF_LOOPBACK)
146 return false;
147
148 if (!link->network)
149 return false;
150
151 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "ip6gre", "ip6tnl", "sit", "vti", "vti6", "can", "vcan", "vxcan", "nlmon"))
152 return false;
153
154 /* L3 or L3S mode do not support ARP. */
155 if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S))
156 return false;
157
158 if (link->network->bond)
159 return false;
160
161 if (link->network->bond)
162 return false;
163
164 return link->network->link_local & mask;
165 }
166
167 static bool link_ipv6ll_enabled(Link *link) {
168 assert(link);
169
170 if (!socket_ipv6_is_supported())
171 return false;
172
173 if (link->flags & IFF_LOOPBACK)
174 return false;
175
176 if (!link->network)
177 return false;
178
179 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "sit", "vti", "can", "vcan", "vxcan", "nlmon"))
180 return false;
181
182 if (link->network->bond)
183 return false;
184
185 if (link_sysctl_ipv6_enabled(link) == 0)
186 return false;
187
188 return link->network->link_local & ADDRESS_FAMILY_IPV6;
189 }
190
191 static bool link_ipv6_enabled(Link *link) {
192 assert(link);
193
194 if (!socket_ipv6_is_supported())
195 return false;
196
197 if (link->network->bond)
198 return false;
199
200 if (link_sysctl_ipv6_enabled(link) == 0)
201 return false;
202
203 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
204 return false;
205
206 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
207 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
208 }
209
210 static bool link_radv_enabled(Link *link) {
211 assert(link);
212
213 if (!link_ipv6ll_enabled(link))
214 return false;
215
216 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
217 }
218
219 static bool link_ipv4_forward_enabled(Link *link) {
220 assert(link);
221
222 if (link->flags & IFF_LOOPBACK)
223 return false;
224
225 if (!link->network)
226 return false;
227
228 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
229 return false;
230
231 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
232 }
233
234 static bool link_ipv6_forward_enabled(Link *link) {
235 assert(link);
236
237 if (!socket_ipv6_is_supported())
238 return false;
239
240 if (link->flags & IFF_LOOPBACK)
241 return false;
242
243 if (!link->network)
244 return false;
245
246 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
247 return false;
248
249 if (link_sysctl_ipv6_enabled(link) == 0)
250 return false;
251
252 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
253 }
254
255 static bool link_proxy_arp_enabled(Link *link) {
256 assert(link);
257
258 if (link->flags & IFF_LOOPBACK)
259 return false;
260
261 if (!link->network)
262 return false;
263
264 if (link->network->proxy_arp < 0)
265 return false;
266
267 return true;
268 }
269
270 static bool link_ipv6_accept_ra_enabled(Link *link) {
271 assert(link);
272
273 if (!socket_ipv6_is_supported())
274 return false;
275
276 if (link->flags & IFF_LOOPBACK)
277 return false;
278
279 if (!link->network)
280 return false;
281
282 if (!link_ipv6ll_enabled(link))
283 return false;
284
285 /* If unset use system default (enabled if local forwarding is disabled.
286 * disabled if local forwarding is enabled).
287 * If set, ignore or enforce RA independent of local forwarding state.
288 */
289 if (link->network->ipv6_accept_ra < 0)
290 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
291 return !link_ipv6_forward_enabled(link);
292 else if (link->network->ipv6_accept_ra > 0)
293 /* accept RA even if ip_forward is enabled */
294 return true;
295 else
296 /* ignore RA */
297 return false;
298 }
299
300 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
301 assert(link);
302
303 if (!socket_ipv6_is_supported())
304 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
305
306 if (link->flags & IFF_LOOPBACK)
307 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
308
309 if (!link->network)
310 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
311
312 return link->network->ipv6_privacy_extensions;
313 }
314
315 static int link_enable_ipv6(Link *link) {
316 bool disabled;
317 int r;
318
319 if (link->flags & IFF_LOOPBACK)
320 return 0;
321
322 disabled = !link_ipv6_enabled(link);
323
324 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", disabled);
325 if (r < 0)
326 log_link_warning_errno(link, r, "Cannot %s IPv6: %m", enable_disable(!disabled));
327 else
328 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
329
330 return 0;
331 }
332
333 static bool link_is_enslaved(Link *link) {
334 if (link->flags & IFF_SLAVE)
335 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
336 return true;
337
338 if (!link->network)
339 return false;
340
341 if (link->master_ifindex > 0 && link->network->bridge)
342 return true;
343
344 /* TODO: add conditions for other netdevs. */
345
346 return false;
347 }
348
349 static void link_update_master_operstate(Link *link, NetDev *netdev) {
350 Link *master;
351
352 if (!netdev)
353 return;
354
355 if (link_get(link->manager, netdev->ifindex, &master) < 0)
356 return;
357
358 link_update_operstate(master, true);
359 }
360
361 void link_update_operstate(Link *link, bool also_update_master) {
362 LinkOperationalState operstate;
363 LinkCarrierState carrier_state;
364 LinkAddressState address_state;
365 _cleanup_strv_free_ char **p = NULL;
366 uint8_t scope = RT_SCOPE_NOWHERE;
367 bool changed = false;
368 Address *address;
369 Iterator i;
370
371 assert(link);
372
373 if (link->kernel_operstate == IF_OPER_DORMANT)
374 carrier_state = LINK_CARRIER_STATE_DORMANT;
375 else if (link_has_carrier(link)) {
376 if (link_is_enslaved(link))
377 carrier_state = LINK_CARRIER_STATE_ENSLAVED;
378 else
379 carrier_state = LINK_CARRIER_STATE_CARRIER;
380 } else if (link->flags & IFF_UP)
381 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
382 else
383 carrier_state = LINK_CARRIER_STATE_OFF;
384
385 if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
386 Link *slave;
387
388 SET_FOREACH(slave, link->slaves, i) {
389 link_update_operstate(slave, false);
390
391 if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
392 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
393 }
394 }
395
396 SET_FOREACH(address, link->addresses, i) {
397 if (!address_is_ready(address))
398 continue;
399
400 if (address->scope < scope)
401 scope = address->scope;
402 }
403
404 /* for operstate we also take foreign addresses into account */
405 SET_FOREACH(address, link->addresses_foreign, i) {
406 if (!address_is_ready(address))
407 continue;
408
409 if (address->scope < scope)
410 scope = address->scope;
411 }
412
413 if (scope < RT_SCOPE_SITE)
414 /* universally accessible addresses found */
415 address_state = LINK_ADDRESS_STATE_ROUTABLE;
416 else if (scope < RT_SCOPE_HOST)
417 /* only link or site local addresses found */
418 address_state = LINK_ADDRESS_STATE_DEGRADED;
419 else
420 /* no useful addresses found */
421 address_state = LINK_ADDRESS_STATE_OFF;
422
423 /* Mapping of address and carrier state vs operational state
424 * carrier state
425 * | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
426 * ------------------------------------------------------------------------------
427 * off | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
428 * address_state degraded | off | no-carrier | dormant | degraded-carrier | degraded | enslaved
429 * routable | off | no-carrier | dormant | degraded-carrier | routable | routable
430 */
431
432 if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
433 operstate = (LinkOperationalState) carrier_state;
434 else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
435 operstate = LINK_OPERSTATE_ROUTABLE;
436 else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
437 operstate = LINK_OPERSTATE_DEGRADED;
438 else
439 operstate = LINK_OPERSTATE_ENSLAVED;
440
441 if (link->carrier_state != carrier_state) {
442 link->carrier_state = carrier_state;
443 changed = true;
444 if (strv_extend(&p, "CarrierState") < 0)
445 log_oom();
446 }
447
448 if (link->address_state != address_state) {
449 link->address_state = address_state;
450 changed = true;
451 if (strv_extend(&p, "AddressState") < 0)
452 log_oom();
453 }
454
455 if (link->operstate != operstate) {
456 link->operstate = operstate;
457 changed = true;
458 if (strv_extend(&p, "OperationalState") < 0)
459 log_oom();
460 }
461
462 if (p)
463 link_send_changed_strv(link, p);
464 if (changed)
465 link_dirty(link);
466
467 if (also_update_master && link->network) {
468 link_update_master_operstate(link, link->network->bond);
469 link_update_master_operstate(link, link->network->bridge);
470 }
471 }
472
473 #define FLAG_STRING(string, flag, old, new) \
474 (((old ^ new) & flag) \
475 ? ((old & flag) ? (" -" string) : (" +" string)) \
476 : "")
477
478 static int link_update_flags(Link *link, sd_netlink_message *m, bool force_update_operstate) {
479 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
480 uint8_t operstate;
481 int r;
482
483 assert(link);
484
485 r = sd_rtnl_message_link_get_flags(m, &flags);
486 if (r < 0)
487 return log_link_warning_errno(link, r, "Could not get link flags: %m");
488
489 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
490 if (r < 0)
491 /* if we got a message without operstate, take it to mean
492 the state was unchanged */
493 operstate = link->kernel_operstate;
494
495 if (!force_update_operstate && (link->flags == flags) && (link->kernel_operstate == operstate))
496 return 0;
497
498 if (link->flags != flags) {
499 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",
500 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
501 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
502 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
503 FLAG_STRING("UP", IFF_UP, link->flags, flags),
504 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
505 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
506 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
507 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
508 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
509 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
510 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
511 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
512 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
513 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
514 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
515 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
516 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
517 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
518 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
519
520 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
521 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
522 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
523 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
524 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
525 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
526 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
527 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
528
529 /* link flags are currently at most 18 bits, let's align to
530 * printing 20 */
531 if (unknown_flags_added)
532 log_link_debug(link,
533 "Unknown link flags gained: %#.5x (ignoring)",
534 unknown_flags_added);
535
536 if (unknown_flags_removed)
537 log_link_debug(link,
538 "Unknown link flags lost: %#.5x (ignoring)",
539 unknown_flags_removed);
540 }
541
542 link->flags = flags;
543 link->kernel_operstate = operstate;
544
545 link_update_operstate(link, true);
546
547 return 0;
548 }
549
550 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
551 _cleanup_(link_unrefp) Link *link = NULL;
552 uint16_t type;
553 const char *ifname, *kind = NULL;
554 int r, ifindex;
555 unsigned short iftype;
556
557 assert(manager);
558 assert(message);
559 assert(ret);
560
561 /* check for link kind */
562 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
563 if (r == 0) {
564 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
565 r = sd_netlink_message_exit_container(message);
566 if (r < 0)
567 return r;
568 }
569
570 r = sd_netlink_message_get_type(message, &type);
571 if (r < 0)
572 return r;
573 else if (type != RTM_NEWLINK)
574 return -EINVAL;
575
576 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
577 if (r < 0)
578 return r;
579 else if (ifindex <= 0)
580 return -EINVAL;
581
582 r = sd_rtnl_message_link_get_type(message, &iftype);
583 if (r < 0)
584 return r;
585
586 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
587 if (r < 0)
588 return r;
589
590 link = new(Link, 1);
591 if (!link)
592 return -ENOMEM;
593
594 *link = (Link) {
595 .n_ref = 1,
596 .manager = manager,
597 .state = LINK_STATE_PENDING,
598 .rtnl_extended_attrs = true,
599 .ifindex = ifindex,
600 .iftype = iftype,
601 .sysctl_ipv6_enabled = -1,
602 };
603
604 link->ifname = strdup(ifname);
605 if (!link->ifname)
606 return -ENOMEM;
607
608 if (kind) {
609 link->kind = strdup(kind);
610 if (!link->kind)
611 return -ENOMEM;
612 }
613
614 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
615 if (r < 0)
616 log_link_debug_errno(link, r, "New device has no master, continuing without");
617
618 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
619 if (r < 0)
620 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
621
622 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
623 return -ENOMEM;
624
625 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
626 return -ENOMEM;
627
628 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
629 return -ENOMEM;
630
631 r = hashmap_ensure_allocated(&manager->links, NULL);
632 if (r < 0)
633 return r;
634
635 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
636 if (r < 0)
637 return r;
638
639 r = link_update_flags(link, message, false);
640 if (r < 0)
641 return r;
642
643 *ret = TAKE_PTR(link);
644
645 return 0;
646 }
647
648 static Link *link_free(Link *link) {
649 Address *address;
650
651 assert(link);
652
653 link->routes = set_free_with_destructor(link->routes, route_free);
654 link->routes_foreign = set_free_with_destructor(link->routes_foreign, route_free);
655
656 link->addresses = set_free_with_destructor(link->addresses, address_free);
657 link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free);
658
659 while ((address = link->pool_addresses)) {
660 LIST_REMOVE(addresses, link->pool_addresses, address);
661 address_free(address);
662 }
663
664 sd_dhcp_server_unref(link->dhcp_server);
665 sd_dhcp_client_unref(link->dhcp_client);
666 sd_dhcp_lease_unref(link->dhcp_lease);
667
668 link_lldp_emit_stop(link);
669
670 free(link->lease_file);
671
672 sd_lldp_unref(link->lldp);
673 free(link->lldp_file);
674
675 ndisc_flush(link);
676
677 sd_ipv4ll_unref(link->ipv4ll);
678 sd_dhcp6_client_unref(link->dhcp6_client);
679 sd_ndisc_unref(link->ndisc);
680 sd_radv_unref(link->radv);
681
682 free(link->ifname);
683 free(link->kind);
684
685 (void) unlink(link->state_file);
686 free(link->state_file);
687
688 sd_device_unref(link->sd_device);
689
690 hashmap_free(link->bound_to_links);
691 hashmap_free(link->bound_by_links);
692
693 set_free_with_destructor(link->slaves, link_unref);
694
695 network_unref(link->network);
696
697 return mfree(link);
698 }
699
700 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
701
702 int link_get(Manager *m, int ifindex, Link **ret) {
703 Link *link;
704
705 assert(m);
706 assert(ifindex);
707 assert(ret);
708
709 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
710 if (!link)
711 return -ENODEV;
712
713 *ret = link;
714
715 return 0;
716 }
717
718 void link_set_state(Link *link, LinkState state) {
719 assert(link);
720
721 if (link->state == state)
722 return;
723
724 log_link_debug(link, "State changed: %s -> %s",
725 link_state_to_string(link->state),
726 link_state_to_string(state));
727
728 link->state = state;
729
730 link_send_changed(link, "AdministrativeState", NULL);
731 }
732
733 static void link_enter_unmanaged(Link *link) {
734 assert(link);
735
736 link_set_state(link, LINK_STATE_UNMANAGED);
737
738 link_dirty(link);
739 }
740
741 int link_stop_clients(Link *link, bool may_keep_dhcp) {
742 int r = 0, k;
743
744 assert(link);
745 assert(link->manager);
746 assert(link->manager->event);
747
748 dhcp4_release_old_lease(link);
749
750 if (link->dhcp_client && (!may_keep_dhcp || !link->network ||
751 !FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP))) {
752 k = sd_dhcp_client_stop(link->dhcp_client);
753 if (k < 0)
754 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
755 }
756
757 if (link->ipv4ll) {
758 k = sd_ipv4ll_stop(link->ipv4ll);
759 if (k < 0)
760 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
761 }
762
763 if (link->dhcp6_client) {
764 k = sd_dhcp6_client_stop(link->dhcp6_client);
765 if (k < 0)
766 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
767 }
768
769 if (link->ndisc) {
770 k = sd_ndisc_stop(link->ndisc);
771 if (k < 0)
772 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
773 }
774
775 if (link->radv) {
776 k = sd_radv_stop(link->radv);
777 if (k < 0)
778 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
779 }
780
781 link_lldp_emit_stop(link);
782 return r;
783 }
784
785 void link_enter_failed(Link *link) {
786 assert(link);
787
788 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
789 return;
790
791 log_link_warning(link, "Failed");
792
793 link_set_state(link, LINK_STATE_FAILED);
794
795 link_stop_clients(link, false);
796
797 link_dirty(link);
798 }
799
800 static Address* link_find_dhcp_server_address(Link *link) {
801 Address *address;
802
803 assert(link);
804 assert(link->network);
805
806 /* The first statically configured address if there is any */
807 LIST_FOREACH(addresses, address, link->network->static_addresses) {
808
809 if (address->family != AF_INET)
810 continue;
811
812 if (in_addr_is_null(address->family, &address->in_addr))
813 continue;
814
815 return address;
816 }
817
818 /* If that didn't work, find a suitable address we got from the pool */
819 LIST_FOREACH(addresses, address, link->pool_addresses) {
820 if (address->family != AF_INET)
821 continue;
822
823 return address;
824 }
825
826 return NULL;
827 }
828
829 static int link_join_netdevs_after_configured(Link *link) {
830 NetDev *netdev;
831 Iterator i;
832 int r;
833
834 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
835 if (netdev->ifindex > 0)
836 /* Assume already enslaved. */
837 continue;
838
839 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
840 continue;
841
842 log_struct(LOG_DEBUG,
843 LOG_LINK_INTERFACE(link),
844 LOG_NETDEV_INTERFACE(netdev),
845 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
846
847 r = netdev_join(netdev, link, NULL);
848 if (r < 0)
849 return log_struct_errno(LOG_WARNING, r,
850 LOG_LINK_INTERFACE(link),
851 LOG_NETDEV_INTERFACE(netdev),
852 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
853 }
854
855 return 0;
856 }
857
858 static void link_enter_configured(Link *link) {
859 assert(link);
860 assert(link->network);
861
862 if (link->state != LINK_STATE_CONFIGURING)
863 return;
864
865 log_link_info(link, "Configured");
866
867 link_set_state(link, LINK_STATE_CONFIGURED);
868
869 (void) link_join_netdevs_after_configured(link);
870
871 link_dirty(link);
872 }
873
874 static int link_request_set_routing_policy_rule(Link *link) {
875 RoutingPolicyRule *rule, *rrule = NULL;
876 int r;
877
878 assert(link);
879 assert(link->network);
880
881 link_set_state(link, LINK_STATE_CONFIGURING);
882 link->routing_policy_rules_configured = false;
883
884 LIST_FOREACH(rules, rule, link->network->rules) {
885 r = routing_policy_rule_get(link->manager, rule, &rrule);
886 if (r >= 0) {
887 if (r == 0)
888 (void) routing_policy_rule_make_local(link->manager, rrule);
889 continue;
890 }
891
892 r = routing_policy_rule_configure(rule, link, NULL);
893 if (r < 0) {
894 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
895 link_enter_failed(link);
896 return r;
897 }
898 if (r > 0)
899 link->routing_policy_rule_messages++;
900 }
901
902 routing_policy_rule_purge(link->manager, link);
903 if (link->routing_policy_rule_messages == 0) {
904 link->routing_policy_rules_configured = true;
905 link_check_ready(link);
906 } else
907 log_link_debug(link, "Setting routing policy rules");
908
909 return 0;
910 }
911
912 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
913 int r;
914
915 assert(link);
916 assert(link->route_messages > 0);
917 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
918 LINK_STATE_FAILED, LINK_STATE_LINGER));
919
920 link->route_messages--;
921
922 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
923 return 1;
924
925 r = sd_netlink_message_get_errno(m);
926 if (r < 0 && r != -EEXIST)
927 log_link_warning_errno(link, r, "Could not set route: %m");
928
929 if (link->route_messages == 0) {
930 log_link_debug(link, "Routes set");
931 link->static_routes_configured = true;
932 link_check_ready(link);
933 }
934
935 return 1;
936 }
937
938 int link_request_set_routes(Link *link) {
939 enum {
940 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
941 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
942 _PHASE_MAX
943 } phase;
944 Route *rt;
945 int r;
946
947 assert(link);
948 assert(link->network);
949 assert(link->addresses_configured);
950 assert(link->address_messages == 0);
951 assert(link->state != _LINK_STATE_INVALID);
952
953 link_set_state(link, LINK_STATE_CONFIGURING);
954 link->static_routes_configured = false;
955
956 r = link_request_set_routing_policy_rule(link);
957 if (r < 0)
958 return r;
959
960 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
961 for (phase = 0; phase < _PHASE_MAX; phase++)
962 LIST_FOREACH(routes, rt, link->network->static_routes) {
963
964 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
965 continue;
966
967 r = route_configure(rt, link, route_handler);
968 if (r < 0) {
969 log_link_warning_errno(link, r, "Could not set routes: %m");
970 link_enter_failed(link);
971 return r;
972 }
973 if (r > 0)
974 link->route_messages++;
975 }
976
977 if (link->route_messages == 0) {
978 link->static_routes_configured = true;
979 link_check_ready(link);
980 } else
981 log_link_debug(link, "Setting routes");
982
983 return 0;
984 }
985
986 void link_check_ready(Link *link) {
987 Address *a;
988 Iterator i;
989
990 assert(link);
991
992 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
993 return;
994
995 if (!link->network)
996 return;
997
998 if (!link->addresses_configured)
999 return;
1000
1001 if (!link->neighbors_configured)
1002 return;
1003
1004 SET_FOREACH(a, link->addresses, i)
1005 if (!address_is_ready(a))
1006 return;
1007
1008 if (!link->addresses_ready) {
1009 link->addresses_ready = true;
1010 link_request_set_routes(link);
1011 return;
1012 }
1013
1014 if (!link->static_routes_configured)
1015 return;
1016
1017 if (!link->routing_policy_rules_configured)
1018 return;
1019
1020 if (link_has_carrier(link) || !link->network->configure_without_carrier) {
1021
1022 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !(link->ipv4ll_address && link->ipv4ll_route))
1023 return;
1024
1025 if (link_ipv6ll_enabled(link) &&
1026 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
1027 return;
1028
1029 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
1030 !link->dhcp4_configured &&
1031 !link->dhcp6_configured &&
1032 !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address && link->ipv4ll_route))
1033 /* When DHCP is enabled, at least one protocol must provide an address, or
1034 * an IPv4ll fallback address must be configured. */
1035 return;
1036
1037 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
1038 return;
1039 }
1040
1041 if (link->state != LINK_STATE_CONFIGURED)
1042 link_enter_configured(link);
1043
1044 return;
1045 }
1046
1047 static int link_request_set_neighbors(Link *link) {
1048 Neighbor *neighbor;
1049 int r;
1050
1051 assert(link);
1052 assert(link->network);
1053 assert(link->state != _LINK_STATE_INVALID);
1054
1055 link_set_state(link, LINK_STATE_CONFIGURING);
1056 link->neighbors_configured = false;
1057
1058 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1059 r = neighbor_configure(neighbor, link, NULL);
1060 if (r < 0) {
1061 log_link_warning_errno(link, r, "Could not set neighbor: %m");
1062 link_enter_failed(link);
1063 return r;
1064 }
1065 }
1066
1067 if (link->neighbor_messages == 0) {
1068 link->neighbors_configured = true;
1069 link_check_ready(link);
1070 } else
1071 log_link_debug(link, "Setting neighbors");
1072
1073 return 0;
1074 }
1075
1076 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1077 int r;
1078
1079 assert(rtnl);
1080 assert(m);
1081 assert(link);
1082 assert(link->ifname);
1083 assert(link->address_messages > 0);
1084 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1085 LINK_STATE_FAILED, LINK_STATE_LINGER));
1086
1087 link->address_messages--;
1088
1089 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1090 return 1;
1091
1092 r = sd_netlink_message_get_errno(m);
1093 if (r < 0 && r != -EEXIST)
1094 log_link_warning_errno(link, r, "could not set address: %m");
1095 else if (r >= 0)
1096 manager_rtnl_process_address(rtnl, m, link->manager);
1097
1098 if (link->address_messages == 0) {
1099 log_link_debug(link, "Addresses set");
1100 link->addresses_configured = true;
1101 link_check_ready(link);
1102 }
1103
1104 return 1;
1105 }
1106
1107 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1108 _cleanup_free_ struct in_addr *addresses = NULL;
1109 size_t n_addresses = 0, n_allocated = 0;
1110 unsigned i;
1111
1112 log_debug("Copying DNS server information from %s", link->ifname);
1113
1114 if (!link->network)
1115 return 0;
1116
1117 for (i = 0; i < link->network->n_dns; i++) {
1118 struct in_addr ia;
1119
1120 /* Only look for IPv4 addresses */
1121 if (link->network->dns[i].family != AF_INET)
1122 continue;
1123
1124 ia = link->network->dns[i].address.in;
1125
1126 /* Never propagate obviously borked data */
1127 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1128 continue;
1129
1130 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1131 return log_oom();
1132
1133 addresses[n_addresses++] = ia;
1134 }
1135
1136 if (link->network->dhcp_use_dns && link->dhcp_lease) {
1137 const struct in_addr *da = NULL;
1138 int j, n;
1139
1140 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
1141 if (n > 0) {
1142
1143 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1144 return log_oom();
1145
1146 for (j = 0; j < n; j++)
1147 if (in4_addr_is_non_local(&da[j]))
1148 addresses[n_addresses++] = da[j];
1149 }
1150 }
1151
1152 if (n_addresses <= 0)
1153 return 0;
1154
1155 return sd_dhcp_server_set_dns(s, addresses, n_addresses);
1156 }
1157
1158 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1159 _cleanup_free_ struct in_addr *addresses = NULL;
1160 size_t n_addresses = 0, n_allocated = 0;
1161 char **a;
1162
1163 if (!link->network)
1164 return 0;
1165
1166 log_debug("Copying NTP server information from %s", link->ifname);
1167
1168 STRV_FOREACH(a, link->network->ntp) {
1169 union in_addr_union ia;
1170
1171 /* Only look for IPv4 addresses */
1172 if (in_addr_from_string(AF_INET, *a, &ia) <= 0)
1173 continue;
1174
1175 /* Never propagate obviously borked data */
1176 if (in4_addr_is_null(&ia.in) || in4_addr_is_localhost(&ia.in))
1177 continue;
1178
1179 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1180 return log_oom();
1181
1182 addresses[n_addresses++] = ia.in;
1183 }
1184
1185 if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1186 const struct in_addr *da = NULL;
1187 int j, n;
1188
1189 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1190 if (n > 0) {
1191
1192 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1193 return log_oom();
1194
1195 for (j = 0; j < n; j++)
1196 if (in4_addr_is_non_local(&da[j]))
1197 addresses[n_addresses++] = da[j];
1198 }
1199 }
1200
1201 if (n_addresses <= 0)
1202 return 0;
1203
1204 return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1205 }
1206
1207 static int link_set_bridge_fdb(Link *link) {
1208 FdbEntry *fdb_entry;
1209 int r;
1210
1211 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1212 r = fdb_entry_configure(link, fdb_entry);
1213 if (r < 0)
1214 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1215 }
1216
1217 return 0;
1218 }
1219
1220 static int link_request_set_addresses(Link *link) {
1221 AddressLabel *label;
1222 Address *ad;
1223 int r;
1224
1225 assert(link);
1226 assert(link->network);
1227 assert(link->state != _LINK_STATE_INVALID);
1228
1229 link_set_state(link, LINK_STATE_CONFIGURING);
1230
1231 /* Reset all *_configured flags we are configuring. */
1232 link->addresses_configured = false;
1233 link->addresses_ready = false;
1234 link->neighbors_configured = false;
1235 link->static_routes_configured = false;
1236 link->routing_policy_rules_configured = false;
1237
1238 r = link_set_bridge_fdb(link);
1239 if (r < 0)
1240 return r;
1241
1242 r = link_request_set_neighbors(link);
1243 if (r < 0)
1244 return r;
1245
1246 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1247 bool update;
1248
1249 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1250
1251 r = address_configure(ad, link, address_handler, update);
1252 if (r < 0) {
1253 log_link_warning_errno(link, r, "Could not set addresses: %m");
1254 link_enter_failed(link);
1255 return r;
1256 }
1257 if (r > 0)
1258 link->address_messages++;
1259 }
1260
1261 LIST_FOREACH(labels, label, link->network->address_labels) {
1262 r = address_label_configure(label, link, NULL, false);
1263 if (r < 0) {
1264 log_link_warning_errno(link, r, "Could not set address label: %m");
1265 link_enter_failed(link);
1266 return r;
1267 }
1268
1269 link->address_label_messages++;
1270 }
1271
1272 /* now that we can figure out a default address for the dhcp server,
1273 start it */
1274 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1275 Address *address;
1276 Link *uplink = NULL;
1277 bool acquired_uplink = false;
1278
1279 address = link_find_dhcp_server_address(link);
1280 if (!address) {
1281 log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1282 link_enter_failed(link);
1283 return 0;
1284 }
1285
1286 /* use the server address' subnet as the pool */
1287 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1288 link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1289 if (r < 0)
1290 return r;
1291
1292 /* TODO:
1293 r = sd_dhcp_server_set_router(link->dhcp_server,
1294 &main_address->in_addr.in);
1295 if (r < 0)
1296 return r;
1297 */
1298
1299 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1300 r = sd_dhcp_server_set_max_lease_time(
1301 link->dhcp_server,
1302 DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1303 if (r < 0)
1304 return r;
1305 }
1306
1307 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1308 r = sd_dhcp_server_set_default_lease_time(
1309 link->dhcp_server,
1310 DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1311 if (r < 0)
1312 return r;
1313 }
1314
1315 if (link->network->dhcp_server_emit_dns) {
1316
1317 if (link->network->n_dhcp_server_dns > 0)
1318 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1319 else {
1320 uplink = manager_find_uplink(link->manager, link);
1321 acquired_uplink = true;
1322
1323 if (!uplink) {
1324 log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1325 r = 0;
1326 } else
1327 r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1328 }
1329 if (r < 0)
1330 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1331 }
1332
1333 if (link->network->dhcp_server_emit_ntp) {
1334
1335 if (link->network->n_dhcp_server_ntp > 0)
1336 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1337 else {
1338 if (!acquired_uplink)
1339 uplink = manager_find_uplink(link->manager, link);
1340
1341 if (!uplink) {
1342 log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1343 r = 0;
1344 } else
1345 r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1346
1347 }
1348 if (r < 0)
1349 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1350 }
1351
1352 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1353 if (r < 0)
1354 return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1355
1356 if (link->network->dhcp_server_emit_timezone) {
1357 _cleanup_free_ char *buffer = NULL;
1358 const char *tz = NULL;
1359
1360 if (link->network->dhcp_server_timezone)
1361 tz = link->network->dhcp_server_timezone;
1362 else {
1363 r = get_timezone(&buffer);
1364 if (r < 0)
1365 log_warning_errno(r, "Failed to determine timezone: %m");
1366 else
1367 tz = buffer;
1368 }
1369
1370 if (tz) {
1371 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1372 if (r < 0)
1373 return r;
1374 }
1375 }
1376 if (!sd_dhcp_server_is_running(link->dhcp_server)) {
1377 r = sd_dhcp_server_start(link->dhcp_server);
1378 if (r < 0) {
1379 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1380
1381 link_enter_failed(link);
1382
1383 return 0;
1384 }
1385 }
1386
1387 log_link_debug(link, "Offering DHCPv4 leases");
1388 }
1389
1390 if (link->address_messages == 0) {
1391 link->addresses_configured = true;
1392 link_check_ready(link);
1393 } else
1394 log_link_debug(link, "Setting addresses");
1395
1396 return 0;
1397 }
1398
1399 static int link_set_bridge_vlan(Link *link) {
1400 int r;
1401
1402 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1403 if (r < 0)
1404 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1405
1406 return r;
1407 }
1408
1409 static int link_set_proxy_arp(Link *link) {
1410 int r;
1411
1412 if (!link_proxy_arp_enabled(link))
1413 return 0;
1414
1415 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1416 if (r < 0)
1417 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1418
1419 return 0;
1420 }
1421
1422 static int link_configure_after_setting_mtu(Link *link);
1423
1424 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1425 int r;
1426
1427 assert(m);
1428 assert(link);
1429 assert(link->ifname);
1430
1431 link->setting_mtu = false;
1432
1433 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1434 return 1;
1435
1436 r = sd_netlink_message_get_errno(m);
1437 if (r < 0) {
1438 log_link_warning_errno(link, r, "Could not set MTU: %m");
1439 return 1;
1440 }
1441
1442 log_link_debug(link, "Setting MTU done.");
1443
1444 if (link->state == LINK_STATE_INITIALIZED)
1445 (void) link_configure_after_setting_mtu(link);
1446
1447 return 1;
1448 }
1449
1450 int link_set_mtu(Link *link, uint32_t mtu) {
1451 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1452 int r;
1453
1454 assert(link);
1455 assert(link->manager);
1456 assert(link->manager->rtnl);
1457
1458 if (mtu == 0 || link->setting_mtu)
1459 return 0;
1460
1461 if (link->mtu == mtu)
1462 return 0;
1463
1464 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1465
1466 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1467 if (r < 0)
1468 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1469
1470 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1471 * for this interface, then disable IPv6 else enable it. */
1472 (void) link_enable_ipv6(link);
1473
1474 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1475 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1476 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1477
1478 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1479 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1480
1481 mtu = IPV6_MIN_MTU;
1482 }
1483
1484 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1485 if (r < 0)
1486 return log_link_error_errno(link, r, "Could not append MTU: %m");
1487
1488 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1489 link_netlink_destroy_callback, link);
1490 if (r < 0)
1491 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1492
1493 link_ref(link);
1494 link->setting_mtu = true;
1495
1496 return 0;
1497 }
1498
1499 static bool link_reduces_vlan_mtu(Link *link) {
1500 /* See netif_reduces_vlan_mtu() in kernel. */
1501 return streq_ptr(link->kind, "macsec");
1502 }
1503
1504 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1505 uint32_t mtu = 0;
1506 NetDev *dev;
1507 Iterator i;
1508
1509 HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1510 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1511 /* See vlan_dev_change_mtu() in kernel. */
1512 mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1513
1514 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1515 /* See macvlan_change_mtu() in kernel. */
1516 mtu = dev->mtu;
1517
1518 return mtu;
1519 }
1520
1521 static int link_configure_mtu(Link *link) {
1522 uint32_t mtu;
1523
1524 assert(link);
1525 assert(link->network);
1526
1527 if (link->network->mtu > 0)
1528 return link_set_mtu(link, link->network->mtu);
1529
1530 mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1531 if (link->mtu >= mtu)
1532 return 0;
1533
1534 log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1535 "If it is not desired, then please explicitly specify MTUBytes= setting.",
1536 link->mtu, mtu);
1537
1538 return link_set_mtu(link, mtu);
1539 }
1540
1541 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1542 int r;
1543
1544 assert(m);
1545 assert(link);
1546 assert(link->ifname);
1547
1548 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1549 return 1;
1550
1551 r = sd_netlink_message_get_errno(m);
1552 if (r < 0)
1553 log_link_warning_errno(link, r, "Could not set link flags: %m");
1554
1555 return 1;
1556 }
1557
1558 static int link_set_flags(Link *link) {
1559 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1560 unsigned ifi_change = 0;
1561 unsigned ifi_flags = 0;
1562 int r;
1563
1564 assert(link);
1565 assert(link->manager);
1566 assert(link->manager->rtnl);
1567
1568 if (link->flags & IFF_LOOPBACK)
1569 return 0;
1570
1571 if (!link->network)
1572 return 0;
1573
1574 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1575 return 0;
1576
1577 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1578 if (r < 0)
1579 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1580
1581 if (link->network->arp >= 0) {
1582 ifi_change |= IFF_NOARP;
1583 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1584 }
1585
1586 if (link->network->multicast >= 0) {
1587 ifi_change |= IFF_MULTICAST;
1588 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1589 }
1590
1591 if (link->network->allmulticast >= 0) {
1592 ifi_change |= IFF_ALLMULTI;
1593 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1594 }
1595
1596 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1597 if (r < 0)
1598 return log_link_error_errno(link, r, "Could not set link flags: %m");
1599
1600 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1601 link_netlink_destroy_callback, link);
1602 if (r < 0)
1603 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1604
1605 link_ref(link);
1606
1607 return 0;
1608 }
1609
1610 static int link_acquire_ipv6_conf(Link *link) {
1611 int r;
1612
1613 assert(link);
1614
1615 if (link_ipv6_accept_ra_enabled(link)) {
1616 assert(link->ndisc);
1617
1618 log_link_debug(link, "Discovering IPv6 routers");
1619
1620 r = sd_ndisc_start(link->ndisc);
1621 if (r < 0 && r != -EBUSY)
1622 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1623 }
1624
1625 if (link_radv_enabled(link)) {
1626 assert(link->radv);
1627 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1628
1629 log_link_debug(link, "Starting IPv6 Router Advertisements");
1630
1631 r = sd_radv_start(link->radv);
1632 if (r < 0 && r != -EBUSY)
1633 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1634 }
1635
1636 (void) dhcp6_request_prefix_delegation(link);
1637
1638 return 0;
1639 }
1640
1641 static int link_acquire_ipv4_conf(Link *link) {
1642 int r;
1643
1644 assert(link);
1645 assert(link->manager);
1646 assert(link->manager->event);
1647
1648 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1649 assert(link->ipv4ll);
1650
1651 log_link_debug(link, "Acquiring IPv4 link-local address");
1652
1653 r = sd_ipv4ll_start(link->ipv4ll);
1654 if (r < 0)
1655 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1656 }
1657
1658 if (link_dhcp4_enabled(link)) {
1659 assert(link->dhcp_client);
1660
1661 log_link_debug(link, "Acquiring DHCPv4 lease");
1662
1663 r = sd_dhcp_client_start(link->dhcp_client);
1664 if (r < 0)
1665 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1666 }
1667
1668 return 0;
1669 }
1670
1671 static int link_acquire_conf(Link *link) {
1672 int r;
1673
1674 assert(link);
1675
1676 r = link_acquire_ipv4_conf(link);
1677 if (r < 0)
1678 return r;
1679
1680 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1681 r = link_acquire_ipv6_conf(link);
1682 if (r < 0)
1683 return r;
1684 }
1685
1686 if (link_lldp_emit_enabled(link)) {
1687 r = link_lldp_emit_start(link);
1688 if (r < 0)
1689 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1690 }
1691
1692 return 0;
1693 }
1694
1695 bool link_has_carrier(Link *link) {
1696 /* see Documentation/networking/operstates.txt in the kernel sources */
1697
1698 if (link->kernel_operstate == IF_OPER_UP)
1699 return true;
1700
1701 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1702 /* operstate may not be implemented, so fall back to flags */
1703 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1704 !FLAGS_SET(link->flags, IFF_DORMANT))
1705 return true;
1706
1707 return false;
1708 }
1709
1710 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1711 int r;
1712
1713 assert(link);
1714
1715 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1716 return 1;
1717
1718 r = sd_netlink_message_get_errno(m);
1719 if (r < 0)
1720 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1721
1722 return 1;
1723 }
1724
1725 static int link_configure_addrgen_mode(Link *link) {
1726 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1727 uint8_t ipv6ll_mode;
1728 int r;
1729
1730 assert(link);
1731 assert(link->network);
1732 assert(link->manager);
1733 assert(link->manager->rtnl);
1734
1735 if (!socket_ipv6_is_supported())
1736 return 0;
1737
1738 log_link_debug(link, "Setting address genmode for link");
1739
1740 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1741 if (r < 0)
1742 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1743
1744 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1745 if (r < 0)
1746 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1747
1748 r = sd_netlink_message_open_container(req, AF_INET6);
1749 if (r < 0)
1750 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1751
1752 if (!link_ipv6ll_enabled(link))
1753 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1754 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1755 /* The file may not exist. And event if it exists, when stable_secret is unset,
1756 * reading the file fails with EIO. */
1757 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1758 else
1759 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1760
1761 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1762 if (r < 0)
1763 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1764
1765 r = sd_netlink_message_close_container(req);
1766 if (r < 0)
1767 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1768
1769 r = sd_netlink_message_close_container(req);
1770 if (r < 0)
1771 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1772
1773 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1774 link_netlink_destroy_callback, link);
1775 if (r < 0)
1776 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1777
1778 link_ref(link);
1779
1780 return 0;
1781 }
1782
1783 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1784 int r;
1785
1786 assert(link);
1787
1788 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1789 return 1;
1790
1791 r = sd_netlink_message_get_errno(m);
1792 if (r < 0)
1793 /* we warn but don't fail the link, as it may be brought up later */
1794 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1795
1796 return 1;
1797 }
1798
1799 static int link_up(Link *link) {
1800 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1801 int r;
1802
1803 assert(link);
1804 assert(link->network);
1805 assert(link->manager);
1806 assert(link->manager->rtnl);
1807
1808 log_link_debug(link, "Bringing link up");
1809
1810 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1811 if (r < 0)
1812 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1813
1814 /* set it free if not enslaved with networkd */
1815 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1816 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1817 if (r < 0)
1818 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1819 }
1820
1821 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1822 if (r < 0)
1823 return log_link_error_errno(link, r, "Could not set link flags: %m");
1824
1825 if (link->network->mac) {
1826 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1827 if (r < 0)
1828 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1829 }
1830
1831 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1832 link_netlink_destroy_callback, link);
1833 if (r < 0)
1834 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1835
1836 link_ref(link);
1837
1838 return 0;
1839 }
1840
1841 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1842 int r;
1843
1844 assert(link);
1845
1846 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1847 return 1;
1848
1849 r = sd_netlink_message_get_errno(m);
1850 if (r < 0)
1851 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1852
1853 return 1;
1854 }
1855
1856 int link_down(Link *link, link_netlink_message_handler_t callback) {
1857 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1858 int r;
1859
1860 assert(link);
1861 assert(link->manager);
1862 assert(link->manager->rtnl);
1863
1864 log_link_debug(link, "Bringing link down");
1865
1866 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1867 RTM_SETLINK, link->ifindex);
1868 if (r < 0)
1869 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1870
1871 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1872 if (r < 0)
1873 return log_link_error_errno(link, r, "Could not set link flags: %m");
1874
1875 r = netlink_call_async(link->manager->rtnl, NULL, req,
1876 callback ?: link_down_handler,
1877 link_netlink_destroy_callback, link);
1878 if (r < 0)
1879 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1880
1881 link_ref(link);
1882
1883 return 0;
1884 }
1885
1886 static int link_handle_bound_to_list(Link *link) {
1887 Link *l;
1888 Iterator i;
1889 int r;
1890 bool required_up = false;
1891 bool link_is_up = false;
1892
1893 assert(link);
1894
1895 if (hashmap_isempty(link->bound_to_links))
1896 return 0;
1897
1898 if (link->flags & IFF_UP)
1899 link_is_up = true;
1900
1901 HASHMAP_FOREACH (l, link->bound_to_links, i)
1902 if (link_has_carrier(l)) {
1903 required_up = true;
1904 break;
1905 }
1906
1907 if (!required_up && link_is_up) {
1908 r = link_down(link, NULL);
1909 if (r < 0)
1910 return r;
1911 } else if (required_up && !link_is_up) {
1912 r = link_up(link);
1913 if (r < 0)
1914 return r;
1915 }
1916
1917 return 0;
1918 }
1919
1920 static int link_handle_bound_by_list(Link *link) {
1921 Iterator i;
1922 Link *l;
1923 int r;
1924
1925 assert(link);
1926
1927 if (hashmap_isempty(link->bound_by_links))
1928 return 0;
1929
1930 HASHMAP_FOREACH (l, link->bound_by_links, i) {
1931 r = link_handle_bound_to_list(l);
1932 if (r < 0)
1933 return r;
1934 }
1935
1936 return 0;
1937 }
1938
1939 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1940 int r;
1941
1942 assert(link);
1943 assert(carrier);
1944
1945 if (link == carrier)
1946 return 0;
1947
1948 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1949 return 0;
1950
1951 r = hashmap_ensure_allocated(h, NULL);
1952 if (r < 0)
1953 return r;
1954
1955 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1956 if (r < 0)
1957 return r;
1958
1959 return 0;
1960 }
1961
1962 static int link_new_bound_by_list(Link *link) {
1963 Manager *m;
1964 Link *carrier;
1965 Iterator i;
1966 int r;
1967 bool list_updated = false;
1968
1969 assert(link);
1970 assert(link->manager);
1971
1972 m = link->manager;
1973
1974 HASHMAP_FOREACH(carrier, m->links, i) {
1975 if (!carrier->network)
1976 continue;
1977
1978 if (strv_isempty(carrier->network->bind_carrier))
1979 continue;
1980
1981 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
1982 r = link_put_carrier(link, carrier, &link->bound_by_links);
1983 if (r < 0)
1984 return r;
1985
1986 list_updated = true;
1987 }
1988 }
1989
1990 if (list_updated)
1991 link_dirty(link);
1992
1993 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
1994 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1995 if (r < 0)
1996 return r;
1997
1998 link_dirty(carrier);
1999 }
2000
2001 return 0;
2002 }
2003
2004 static int link_new_bound_to_list(Link *link) {
2005 Manager *m;
2006 Link *carrier;
2007 Iterator i;
2008 int r;
2009 bool list_updated = false;
2010
2011 assert(link);
2012 assert(link->manager);
2013
2014 if (!link->network)
2015 return 0;
2016
2017 if (strv_isempty(link->network->bind_carrier))
2018 return 0;
2019
2020 m = link->manager;
2021
2022 HASHMAP_FOREACH (carrier, m->links, i) {
2023 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
2024 r = link_put_carrier(link, carrier, &link->bound_to_links);
2025 if (r < 0)
2026 return r;
2027
2028 list_updated = true;
2029 }
2030 }
2031
2032 if (list_updated)
2033 link_dirty(link);
2034
2035 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2036 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2037 if (r < 0)
2038 return r;
2039
2040 link_dirty(carrier);
2041 }
2042
2043 return 0;
2044 }
2045
2046 static int link_new_carrier_maps(Link *link) {
2047 int r;
2048
2049 r = link_new_bound_by_list(link);
2050 if (r < 0)
2051 return r;
2052
2053 r = link_handle_bound_by_list(link);
2054 if (r < 0)
2055 return r;
2056
2057 r = link_new_bound_to_list(link);
2058 if (r < 0)
2059 return r;
2060
2061 r = link_handle_bound_to_list(link);
2062 if (r < 0)
2063 return r;
2064
2065 return 0;
2066 }
2067
2068 static void link_free_bound_to_list(Link *link) {
2069 Link *bound_to;
2070 Iterator i;
2071
2072 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2073 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2074
2075 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2076 link_dirty(bound_to);
2077 }
2078
2079 return;
2080 }
2081
2082 static void link_free_bound_by_list(Link *link) {
2083 Link *bound_by;
2084 Iterator i;
2085
2086 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2087 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2088
2089 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2090 link_dirty(bound_by);
2091 link_handle_bound_to_list(bound_by);
2092 }
2093 }
2094
2095 return;
2096 }
2097
2098 static void link_free_carrier_maps(Link *link) {
2099 bool list_updated = false;
2100
2101 assert(link);
2102
2103 if (!hashmap_isempty(link->bound_to_links)) {
2104 link_free_bound_to_list(link);
2105 list_updated = true;
2106 }
2107
2108 if (!hashmap_isempty(link->bound_by_links)) {
2109 link_free_bound_by_list(link);
2110 list_updated = true;
2111 }
2112
2113 if (list_updated)
2114 link_dirty(link);
2115
2116 return;
2117 }
2118
2119 static int link_append_to_master(Link *link, NetDev *netdev) {
2120 Link *master;
2121 int r;
2122
2123 assert(link);
2124 assert(netdev);
2125
2126 r = link_get(link->manager, netdev->ifindex, &master);
2127 if (r < 0)
2128 return r;
2129
2130 r = set_ensure_allocated(&master->slaves, NULL);
2131 if (r < 0)
2132 return r;
2133
2134 r = set_put(master->slaves, link);
2135 if (r < 0)
2136 return r;
2137
2138 link_ref(link);
2139 return 0;
2140 }
2141
2142 static void link_drop_from_master(Link *link, NetDev *netdev) {
2143 Link *master;
2144
2145 assert(link);
2146
2147 if (!link->manager || !netdev)
2148 return;
2149
2150 if (link_get(link->manager, netdev->ifindex, &master) < 0)
2151 return;
2152
2153 link_unref(set_remove(master->slaves, link));
2154 }
2155
2156 static void link_detach_from_manager(Link *link) {
2157 if (!link || !link->manager)
2158 return;
2159
2160 link_unref(set_remove(link->manager->links_requesting_uuid, link));
2161 link_clean(link);
2162
2163 /* The following must be called at last. */
2164 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2165 link_unref(link);
2166 }
2167
2168 void link_drop(Link *link) {
2169 if (!link || link->state == LINK_STATE_LINGER)
2170 return;
2171
2172 link_set_state(link, LINK_STATE_LINGER);
2173
2174 link_free_carrier_maps(link);
2175
2176 if (link->network) {
2177 link_drop_from_master(link, link->network->bridge);
2178 link_drop_from_master(link, link->network->bond);
2179 }
2180
2181 log_link_debug(link, "Link removed");
2182
2183 (void) unlink(link->state_file);
2184 link_detach_from_manager(link);
2185 }
2186
2187 static int link_joined(Link *link) {
2188 int r;
2189
2190 assert(link);
2191 assert(link->network);
2192
2193 if (!hashmap_isempty(link->bound_to_links)) {
2194 r = link_handle_bound_to_list(link);
2195 if (r < 0)
2196 return r;
2197 } else if (!(link->flags & IFF_UP)) {
2198 r = link_up(link);
2199 if (r < 0) {
2200 link_enter_failed(link);
2201 return r;
2202 }
2203 }
2204
2205 if (link->network->bridge) {
2206 r = link_set_bridge(link);
2207 if (r < 0)
2208 log_link_error_errno(link, r, "Could not set bridge message: %m");
2209
2210 r = link_append_to_master(link, link->network->bridge);
2211 if (r < 0)
2212 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2213 }
2214
2215 if (link->network->bond) {
2216 r = link_set_bond(link);
2217 if (r < 0)
2218 log_link_error_errno(link, r, "Could not set bond message: %m");
2219
2220 r = link_append_to_master(link, link->network->bond);
2221 if (r < 0)
2222 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2223 }
2224
2225 if (link->network->use_br_vlan &&
2226 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2227 r = link_set_bridge_vlan(link);
2228 if (r < 0)
2229 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2230 }
2231
2232 /* Skip setting up addresses until it gets carrier,
2233 or it would try to set addresses twice,
2234 which is bad for non-idempotent steps. */
2235 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2236 return 0;
2237
2238 return link_request_set_addresses(link);
2239 }
2240
2241 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2242 int r;
2243
2244 assert(link);
2245 assert(link->network);
2246 assert(link->enslaving > 0);
2247
2248 link->enslaving--;
2249
2250 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2251 return 1;
2252
2253 r = sd_netlink_message_get_errno(m);
2254 if (r < 0 && r != -EEXIST) {
2255 log_link_error_errno(link, r, "Could not join netdev: %m");
2256 link_enter_failed(link);
2257 return 1;
2258 } else
2259 log_link_debug(link, "Joined netdev");
2260
2261 if (link->enslaving == 0) {
2262 link_joined(link);
2263 }
2264
2265 return 1;
2266 }
2267
2268 static int link_enter_join_netdev(Link *link) {
2269 NetDev *netdev;
2270 Iterator i;
2271 int r;
2272
2273 assert(link);
2274 assert(link->network);
2275 assert(link->state == LINK_STATE_INITIALIZED);
2276
2277 link_set_state(link, LINK_STATE_CONFIGURING);
2278
2279 link_dirty(link);
2280 link->enslaving = 0;
2281
2282 if (link->network->bond) {
2283 if (link->network->bond->state == NETDEV_STATE_READY &&
2284 link->network->bond->ifindex == link->master_ifindex)
2285 return link_joined(link);
2286
2287 log_struct(LOG_DEBUG,
2288 LOG_LINK_INTERFACE(link),
2289 LOG_NETDEV_INTERFACE(link->network->bond),
2290 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2291
2292 link->enslaving++;
2293
2294 r = netdev_join(link->network->bond, link, netdev_join_handler);
2295 if (r < 0) {
2296 log_struct_errno(LOG_WARNING, r,
2297 LOG_LINK_INTERFACE(link),
2298 LOG_NETDEV_INTERFACE(link->network->bond),
2299 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2300 link_enter_failed(link);
2301 return r;
2302 }
2303 }
2304
2305 if (link->network->bridge) {
2306 log_struct(LOG_DEBUG,
2307 LOG_LINK_INTERFACE(link),
2308 LOG_NETDEV_INTERFACE(link->network->bridge),
2309 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2310
2311 link->enslaving++;
2312
2313 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2314 if (r < 0) {
2315 log_struct_errno(LOG_WARNING, r,
2316 LOG_LINK_INTERFACE(link),
2317 LOG_NETDEV_INTERFACE(link->network->bridge),
2318 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2319 link_enter_failed(link);
2320 return r;
2321 }
2322 }
2323
2324 if (link->network->vrf) {
2325 log_struct(LOG_DEBUG,
2326 LOG_LINK_INTERFACE(link),
2327 LOG_NETDEV_INTERFACE(link->network->vrf),
2328 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2329
2330 link->enslaving++;
2331
2332 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2333 if (r < 0) {
2334 log_struct_errno(LOG_WARNING, r,
2335 LOG_LINK_INTERFACE(link),
2336 LOG_NETDEV_INTERFACE(link->network->vrf),
2337 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2338 link_enter_failed(link);
2339 return r;
2340 }
2341 }
2342
2343 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2344
2345 if (netdev->ifindex > 0)
2346 /* Assume already enslaved. */
2347 continue;
2348
2349 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2350 continue;
2351
2352 log_struct(LOG_DEBUG,
2353 LOG_LINK_INTERFACE(link),
2354 LOG_NETDEV_INTERFACE(netdev),
2355 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2356
2357 link->enslaving++;
2358
2359 r = netdev_join(netdev, link, netdev_join_handler);
2360 if (r < 0) {
2361 log_struct_errno(LOG_WARNING, r,
2362 LOG_LINK_INTERFACE(link),
2363 LOG_NETDEV_INTERFACE(netdev),
2364 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2365 link_enter_failed(link);
2366 return r;
2367 }
2368 }
2369
2370 if (link->enslaving == 0)
2371 return link_joined(link);
2372
2373 return 0;
2374 }
2375
2376 static int link_set_ipv4_forward(Link *link) {
2377 int r;
2378
2379 if (!link_ipv4_forward_enabled(link))
2380 return 0;
2381
2382 /* We propagate the forwarding flag from one interface to the
2383 * global setting one way. This means: as long as at least one
2384 * interface was configured at any time that had IP forwarding
2385 * enabled the setting will stay on for good. We do this
2386 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2387 * somewhat in sync (see below). */
2388
2389 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2390 if (r < 0)
2391 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2392
2393 return 0;
2394 }
2395
2396 static int link_set_ipv6_forward(Link *link) {
2397 int r;
2398
2399 if (!link_ipv6_forward_enabled(link))
2400 return 0;
2401
2402 /* On Linux, the IPv6 stack does not know a per-interface
2403 * packet forwarding setting: either packet forwarding is on
2404 * for all, or off for all. We hence don't bother with a
2405 * per-interface setting, but simply propagate the interface
2406 * flag, if it is set, to the global flag, one-way. Note that
2407 * while IPv4 would allow a per-interface flag, we expose the
2408 * same behaviour there and also propagate the setting from
2409 * one to all, to keep things simple (see above). */
2410
2411 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2412 if (r < 0)
2413 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2414
2415 return 0;
2416 }
2417
2418 static int link_set_ipv6_privacy_extensions(Link *link) {
2419 IPv6PrivacyExtensions s;
2420 int r;
2421
2422 s = link_ipv6_privacy_extensions(link);
2423 if (s < 0)
2424 return 0;
2425
2426 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2427 if (r < 0)
2428 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2429
2430 return 0;
2431 }
2432
2433 static int link_set_ipv6_accept_ra(Link *link) {
2434 int r;
2435
2436 /* Make this a NOP if IPv6 is not available */
2437 if (!socket_ipv6_is_supported())
2438 return 0;
2439
2440 if (link->flags & IFF_LOOPBACK)
2441 return 0;
2442
2443 if (!link->network)
2444 return 0;
2445
2446 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2447 if (r < 0)
2448 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2449
2450 return 0;
2451 }
2452
2453 static int link_set_ipv6_dad_transmits(Link *link) {
2454 int r;
2455
2456 /* Make this a NOP if IPv6 is not available */
2457 if (!socket_ipv6_is_supported())
2458 return 0;
2459
2460 if (link->flags & IFF_LOOPBACK)
2461 return 0;
2462
2463 if (!link->network)
2464 return 0;
2465
2466 if (link->network->ipv6_dad_transmits < 0)
2467 return 0;
2468
2469 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2470 if (r < 0)
2471 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2472
2473 return 0;
2474 }
2475
2476 static int link_set_ipv6_hop_limit(Link *link) {
2477 int r;
2478
2479 /* Make this a NOP if IPv6 is not available */
2480 if (!socket_ipv6_is_supported())
2481 return 0;
2482
2483 if (link->flags & IFF_LOOPBACK)
2484 return 0;
2485
2486 if (!link->network)
2487 return 0;
2488
2489 if (link->network->ipv6_hop_limit < 0)
2490 return 0;
2491
2492 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2493 if (r < 0)
2494 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2495
2496 return 0;
2497 }
2498
2499 static int link_set_ipv6_mtu(Link *link) {
2500 int r;
2501
2502 /* Make this a NOP if IPv6 is not available */
2503 if (!socket_ipv6_is_supported())
2504 return 0;
2505
2506 if (link->flags & IFF_LOOPBACK)
2507 return 0;
2508
2509 if (link->network->ipv6_mtu == 0)
2510 return 0;
2511
2512 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2513 if (r < 0)
2514 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2515
2516 return 0;
2517 }
2518
2519 static bool link_is_static_address_configured(Link *link, Address *address) {
2520 Address *net_address;
2521
2522 assert(link);
2523 assert(address);
2524
2525 if (!link->network)
2526 return false;
2527
2528 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2529 if (address_equal(net_address, address))
2530 return true;
2531
2532 return false;
2533 }
2534
2535 static bool link_is_static_route_configured(Link *link, Route *route) {
2536 Route *net_route;
2537
2538 assert(link);
2539 assert(route);
2540
2541 if (!link->network)
2542 return false;
2543
2544 LIST_FOREACH(routes, net_route, link->network->static_routes)
2545 if (route_equal(net_route, route))
2546 return true;
2547
2548 return false;
2549 }
2550
2551 static bool link_address_is_dynamic(Link *link, Address *address) {
2552 Route *route;
2553 Iterator i;
2554
2555 assert(link);
2556 assert(address);
2557
2558 if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2559 return true;
2560
2561 /* Even when the address is leased from a DHCP server, networkd assign the address
2562 * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2563 * corresponding routes with RTPROT_DHCP. */
2564 SET_FOREACH(route, link->routes_foreign, i) {
2565 if (route->protocol != RTPROT_DHCP)
2566 continue;
2567
2568 if (address->family != route->family)
2569 continue;
2570
2571 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2572 return true;
2573 }
2574
2575 return false;
2576 }
2577
2578 static int link_drop_foreign_config(Link *link) {
2579 Address *address;
2580 Route *route;
2581 Iterator i;
2582 int r;
2583
2584 SET_FOREACH(address, link->addresses_foreign, i) {
2585 /* we consider IPv6LL addresses to be managed by the kernel */
2586 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2587 continue;
2588
2589 if (link_address_is_dynamic(link, address)) {
2590 if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2591 continue;
2592 } else if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2593 continue;
2594
2595 if (link_is_static_address_configured(link, address)) {
2596 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2597 if (r < 0)
2598 return log_link_error_errno(link, r, "Failed to add address: %m");
2599 } else {
2600 r = address_remove(address, link, NULL);
2601 if (r < 0)
2602 return r;
2603 }
2604 }
2605
2606 SET_FOREACH(route, link->routes_foreign, i) {
2607 /* do not touch routes managed by the kernel */
2608 if (route->protocol == RTPROT_KERNEL)
2609 continue;
2610
2611 if (route->protocol == RTPROT_STATIC &&
2612 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2613 continue;
2614
2615 if (route->protocol == RTPROT_DHCP &&
2616 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2617 continue;
2618
2619 if (link_is_static_route_configured(link, route)) {
2620 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2621 if (r < 0)
2622 return r;
2623 } else {
2624 r = route_remove(route, link, NULL);
2625 if (r < 0)
2626 return r;
2627 }
2628 }
2629
2630 return 0;
2631 }
2632
2633 static int link_drop_config(Link *link) {
2634 Address *address, *pool_address;
2635 Route *route;
2636 Iterator i;
2637 int r;
2638
2639 SET_FOREACH(address, link->addresses, i) {
2640 /* we consider IPv6LL addresses to be managed by the kernel */
2641 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2642 continue;
2643
2644 r = address_remove(address, link, NULL);
2645 if (r < 0)
2646 return r;
2647
2648 /* If this address came from an address pool, clean up the pool */
2649 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2650 if (address_equal(address, pool_address)) {
2651 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2652 address_free(pool_address);
2653 break;
2654 }
2655 }
2656 }
2657
2658 SET_FOREACH(route, link->routes, i) {
2659 /* do not touch routes managed by the kernel */
2660 if (route->protocol == RTPROT_KERNEL)
2661 continue;
2662
2663 r = route_remove(route, link, NULL);
2664 if (r < 0)
2665 return r;
2666 }
2667
2668 ndisc_flush(link);
2669
2670 return 0;
2671 }
2672
2673 static int link_configure(Link *link) {
2674 int r;
2675
2676 assert(link);
2677 assert(link->network);
2678 assert(link->state == LINK_STATE_INITIALIZED);
2679
2680 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
2681 return link_configure_can(link);
2682
2683 /* Drop foreign config, but ignore loopback or critical devices.
2684 * We do not want to remove loopback address or addresses used for root NFS. */
2685 if (!(link->flags & IFF_LOOPBACK) &&
2686 link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
2687 r = link_drop_foreign_config(link);
2688 if (r < 0)
2689 return r;
2690 }
2691
2692 r = link_set_proxy_arp(link);
2693 if (r < 0)
2694 return r;
2695
2696 r = ipv6_proxy_ndp_addresses_configure(link);
2697 if (r < 0)
2698 return r;
2699
2700 r = link_set_ipv4_forward(link);
2701 if (r < 0)
2702 return r;
2703
2704 r = link_set_ipv6_forward(link);
2705 if (r < 0)
2706 return r;
2707
2708 r = link_set_ipv6_privacy_extensions(link);
2709 if (r < 0)
2710 return r;
2711
2712 r = link_set_ipv6_accept_ra(link);
2713 if (r < 0)
2714 return r;
2715
2716 r = link_set_ipv6_dad_transmits(link);
2717 if (r < 0)
2718 return r;
2719
2720 r = link_set_ipv6_hop_limit(link);
2721 if (r < 0)
2722 return r;
2723
2724 r = link_set_flags(link);
2725 if (r < 0)
2726 return r;
2727
2728 r = link_set_ipv6_mtu(link);
2729 if (r < 0)
2730 return r;
2731
2732 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
2733 r = ipv4ll_configure(link);
2734 if (r < 0)
2735 return r;
2736 }
2737
2738 if (link_dhcp4_enabled(link)) {
2739 r = dhcp4_set_promote_secondaries(link);
2740 if (r < 0)
2741 return r;
2742
2743 r = dhcp4_configure(link);
2744 if (r < 0)
2745 return r;
2746 }
2747
2748 if (link_dhcp4_server_enabled(link)) {
2749 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2750 if (r < 0)
2751 return r;
2752
2753 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2754 if (r < 0)
2755 return r;
2756 }
2757
2758 if (link_dhcp6_enabled(link) ||
2759 link_ipv6_accept_ra_enabled(link)) {
2760 r = dhcp6_configure(link);
2761 if (r < 0)
2762 return r;
2763 }
2764
2765 if (link_ipv6_accept_ra_enabled(link)) {
2766 r = ndisc_configure(link);
2767 if (r < 0)
2768 return r;
2769 }
2770
2771 if (link_radv_enabled(link)) {
2772 r = radv_configure(link);
2773 if (r < 0)
2774 return r;
2775 }
2776
2777 if (link_lldp_rx_enabled(link)) {
2778 r = link_lldp_rx_configure(link);
2779 if (r < 0)
2780 return r;
2781 }
2782
2783 r = link_configure_mtu(link);
2784 if (r < 0)
2785 return r;
2786
2787 r = link_configure_addrgen_mode(link);
2788 if (r < 0)
2789 return r;
2790
2791 return link_configure_after_setting_mtu(link);
2792 }
2793
2794 static int link_configure_after_setting_mtu(Link *link) {
2795 int r;
2796
2797 assert(link);
2798 assert(link->network);
2799 assert(link->state == LINK_STATE_INITIALIZED);
2800
2801 if (link->setting_mtu)
2802 return 0;
2803
2804 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2805 r = link_acquire_conf(link);
2806 if (r < 0)
2807 return r;
2808 }
2809
2810 return link_enter_join_netdev(link);
2811 }
2812
2813 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
2814 assert(duid);
2815
2816 if (duid->raw_data_len > 0)
2817 return 0;
2818
2819 if (duid->type != DUID_TYPE_UUID)
2820 return -EINVAL;
2821
2822 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
2823 duid->raw_data_len = sizeof(sd_id128_t);
2824
2825 return 1;
2826 }
2827
2828 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
2829 Manager *manager = userdata;
2830 const sd_bus_error *e;
2831 const void *a;
2832 size_t sz;
2833 DUID *duid;
2834 Link *link;
2835 int r;
2836
2837 assert(m);
2838 assert(manager);
2839
2840 e = sd_bus_message_get_error(m);
2841 if (e) {
2842 log_error_errno(sd_bus_error_get_errno(e),
2843 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
2844 e->message);
2845 goto configure;
2846 }
2847
2848 r = sd_bus_message_read_array(m, 'y', &a, &sz);
2849 if (r < 0)
2850 goto configure;
2851
2852 if (sz != sizeof(sd_id128_t)) {
2853 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
2854 goto configure;
2855 }
2856
2857 memcpy(&manager->product_uuid, a, sz);
2858 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
2859 (void) duid_set_uuid(duid, manager->product_uuid);
2860
2861 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
2862
2863 configure:
2864 while ((link = set_steal_first(manager->links_requesting_uuid))) {
2865 r = link_configure(link);
2866 if (r < 0)
2867 log_link_error_errno(link, r, "Failed to configure link: %m");
2868 }
2869
2870 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
2871
2872 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
2873 * even if the method fails. */
2874 manager->has_product_uuid = true;
2875
2876 return 1;
2877 }
2878
2879 static bool link_requires_uuid(Link *link) {
2880 const DUID *duid;
2881
2882 assert(link);
2883 assert(link->manager);
2884 assert(link->network);
2885
2886 duid = link_get_duid(link);
2887 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
2888 return false;
2889
2890 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
2891 return true;
2892
2893 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
2894 return true;
2895
2896 return false;
2897 }
2898
2899 static int link_configure_duid(Link *link) {
2900 Manager *m;
2901 DUID *duid;
2902 int r;
2903
2904 assert(link);
2905 assert(link->manager);
2906 assert(link->network);
2907
2908 m = link->manager;
2909 duid = link_get_duid(link);
2910
2911 if (!link_requires_uuid(link))
2912 return 1;
2913
2914 if (m->has_product_uuid) {
2915 (void) duid_set_uuid(duid, m->product_uuid);
2916 return 1;
2917 }
2918
2919 if (!m->links_requesting_uuid) {
2920 r = manager_request_product_uuid(m, link);
2921 if (r < 0) {
2922 if (r == -ENOMEM)
2923 return r;
2924
2925 log_link_warning_errno(link, r,
2926 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
2927 return 1;
2928 }
2929 } else {
2930 r = set_put(m->links_requesting_uuid, link);
2931 if (r < 0)
2932 return log_oom();
2933
2934 r = set_put(m->duids_requesting_uuid, duid);
2935 if (r < 0)
2936 return log_oom();
2937 }
2938
2939 return 0;
2940 }
2941
2942 static int link_initialized_and_synced(Link *link) {
2943 Network *network;
2944 int r;
2945
2946 assert(link);
2947 assert(link->ifname);
2948 assert(link->manager);
2949
2950 /* We may get called either from the asynchronous netlink callback,
2951 * or directly for link_add() if running in a container. See link_add(). */
2952 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
2953 return 0;
2954
2955 log_link_debug(link, "Link state is up-to-date");
2956 link_set_state(link, LINK_STATE_INITIALIZED);
2957
2958 r = link_new_bound_by_list(link);
2959 if (r < 0)
2960 return r;
2961
2962 r = link_handle_bound_by_list(link);
2963 if (r < 0)
2964 return r;
2965
2966 if (!link->network) {
2967 r = network_get(link->manager, link->sd_device, link->ifname,
2968 &link->mac, &network);
2969 if (r == -ENOENT) {
2970 link_enter_unmanaged(link);
2971 return 0;
2972 } else if (r == 0 && network->unmanaged) {
2973 link_enter_unmanaged(link);
2974 return 0;
2975 } else if (r < 0)
2976 return r;
2977
2978 if (link->flags & IFF_LOOPBACK) {
2979 if (network->link_local != ADDRESS_FAMILY_NO)
2980 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2981
2982 if (network->dhcp != ADDRESS_FAMILY_NO)
2983 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2984
2985 if (network->dhcp_server)
2986 log_link_debug(link, "Ignoring DHCP server for loopback link");
2987 }
2988
2989 r = network_apply(network, link);
2990 if (r < 0)
2991 return r;
2992 }
2993
2994 r = link_new_bound_to_list(link);
2995 if (r < 0)
2996 return r;
2997
2998 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
2999 * link_configure() is called later asynchronously. */
3000 r = link_configure_duid(link);
3001 if (r <= 0)
3002 return r;
3003
3004 r = link_configure(link);
3005 if (r < 0)
3006 return r;
3007
3008 return 0;
3009 }
3010
3011 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3012 (void) link_initialized_and_synced(link);
3013 return 1;
3014 }
3015
3016 int link_initialized(Link *link, sd_device *device) {
3017 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3018 int r;
3019
3020 assert(link);
3021 assert(link->manager);
3022 assert(link->manager->rtnl);
3023 assert(device);
3024
3025 if (link->state != LINK_STATE_PENDING)
3026 return 0;
3027
3028 if (link->sd_device)
3029 return 0;
3030
3031 log_link_debug(link, "udev initialized link");
3032 link_set_state(link, LINK_STATE_INITIALIZED);
3033
3034 link->sd_device = sd_device_ref(device);
3035
3036 /* udev has initialized the link, but we don't know if we have yet
3037 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3038 * when it returns we know that the pending NEWLINKs have already been
3039 * processed and that we are up-to-date */
3040
3041 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3042 link->ifindex);
3043 if (r < 0)
3044 return r;
3045
3046 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3047 link_netlink_destroy_callback, link);
3048 if (r < 0)
3049 return r;
3050
3051 link_ref(link);
3052
3053 return 0;
3054 }
3055
3056 static int link_load(Link *link) {
3057 _cleanup_free_ char *network_file = NULL,
3058 *addresses = NULL,
3059 *routes = NULL,
3060 *dhcp4_address = NULL,
3061 *ipv4ll_address = NULL;
3062 union in_addr_union address;
3063 union in_addr_union route_dst;
3064 const char *p;
3065 int r;
3066
3067 assert(link);
3068
3069 r = parse_env_file(NULL, link->state_file,
3070 "NETWORK_FILE", &network_file,
3071 "ADDRESSES", &addresses,
3072 "ROUTES", &routes,
3073 "DHCP4_ADDRESS", &dhcp4_address,
3074 "IPV4LL_ADDRESS", &ipv4ll_address);
3075 if (r < 0 && r != -ENOENT)
3076 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3077
3078 if (network_file) {
3079 Network *network;
3080 char *suffix;
3081
3082 /* drop suffix */
3083 suffix = strrchr(network_file, '.');
3084 if (!suffix) {
3085 log_link_debug(link, "Failed to get network name from %s", network_file);
3086 goto network_file_fail;
3087 }
3088 *suffix = '\0';
3089
3090 r = network_get_by_name(link->manager, basename(network_file), &network);
3091 if (r < 0) {
3092 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3093 goto network_file_fail;
3094 }
3095
3096 r = network_apply(network, link);
3097 if (r < 0)
3098 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3099 }
3100
3101 network_file_fail:
3102
3103 if (addresses) {
3104 p = addresses;
3105
3106 for (;;) {
3107 _cleanup_free_ char *address_str = NULL;
3108 char *prefixlen_str;
3109 int family;
3110 unsigned char prefixlen;
3111
3112 r = extract_first_word(&p, &address_str, NULL, 0);
3113 if (r < 0) {
3114 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3115 continue;
3116 }
3117 if (r == 0)
3118 break;
3119
3120 prefixlen_str = strchr(address_str, '/');
3121 if (!prefixlen_str) {
3122 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3123 continue;
3124 }
3125
3126 *prefixlen_str++ = '\0';
3127
3128 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3129 if (r != 1) {
3130 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3131 continue;
3132 }
3133
3134 r = in_addr_from_string_auto(address_str, &family, &address);
3135 if (r < 0) {
3136 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3137 continue;
3138 }
3139
3140 r = address_add(link, family, &address, prefixlen, NULL);
3141 if (r < 0)
3142 return log_link_error_errno(link, r, "Failed to add address: %m");
3143 }
3144 }
3145
3146 if (routes) {
3147 p = routes;
3148
3149 for (;;) {
3150 Route *route;
3151 _cleanup_free_ char *route_str = NULL;
3152 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3153 usec_t lifetime;
3154 char *prefixlen_str;
3155 int family;
3156 unsigned char prefixlen, tos, table;
3157 uint32_t priority;
3158
3159 r = extract_first_word(&p, &route_str, NULL, 0);
3160 if (r < 0) {
3161 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3162 continue;
3163 }
3164 if (r == 0)
3165 break;
3166
3167 prefixlen_str = strchr(route_str, '/');
3168 if (!prefixlen_str) {
3169 log_link_debug(link, "Failed to parse route %s", route_str);
3170 continue;
3171 }
3172
3173 *prefixlen_str++ = '\0';
3174
3175 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3176 if (r != 5) {
3177 log_link_debug(link,
3178 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3179 prefixlen_str);
3180 continue;
3181 }
3182
3183 r = in_addr_from_string_auto(route_str, &family, &route_dst);
3184 if (r < 0) {
3185 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3186 continue;
3187 }
3188
3189 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3190 if (r < 0)
3191 return log_link_error_errno(link, r, "Failed to add route: %m");
3192
3193 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3194 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3195 0, route_expire_handler, route);
3196 if (r < 0)
3197 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3198 }
3199
3200 route->lifetime = lifetime;
3201 sd_event_source_unref(route->expire);
3202 route->expire = TAKE_PTR(expire);
3203 }
3204 }
3205
3206 if (dhcp4_address) {
3207 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3208 if (r < 0) {
3209 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3210 goto dhcp4_address_fail;
3211 }
3212
3213 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3214 if (r < 0)
3215 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3216
3217 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3218 if (r < 0)
3219 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3220 }
3221
3222 dhcp4_address_fail:
3223
3224 if (ipv4ll_address) {
3225 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3226 if (r < 0) {
3227 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3228 goto ipv4ll_address_fail;
3229 }
3230
3231 r = sd_ipv4ll_new(&link->ipv4ll);
3232 if (r < 0)
3233 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3234
3235 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3236 if (r < 0)
3237 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3238 }
3239
3240 ipv4ll_address_fail:
3241
3242 return 0;
3243 }
3244
3245 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3246 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3247 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3248 Link *link;
3249 int r;
3250
3251 assert(m);
3252 assert(m->rtnl);
3253 assert(message);
3254 assert(ret);
3255
3256 r = link_new(m, message, ret);
3257 if (r < 0)
3258 return r;
3259
3260 link = *ret;
3261
3262 log_link_debug(link, "Link %d added", link->ifindex);
3263
3264 r = link_load(link);
3265 if (r < 0)
3266 return r;
3267
3268 if (detect_container() <= 0) {
3269 /* not in a container, udev will be around */
3270 sprintf(ifindex_str, "n%d", link->ifindex);
3271 r = sd_device_new_from_device_id(&device, ifindex_str);
3272 if (r < 0) {
3273 log_link_warning_errno(link, r, "Could not find device: %m");
3274 goto failed;
3275 }
3276
3277 r = sd_device_get_is_initialized(device);
3278 if (r < 0) {
3279 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3280 goto failed;
3281 }
3282 if (r == 0) {
3283 /* not yet ready */
3284 log_link_debug(link, "link pending udev initialization...");
3285 return 0;
3286 }
3287
3288 r = device_is_renaming(device);
3289 if (r < 0) {
3290 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3291 goto failed;
3292 }
3293 if (r > 0) {
3294 log_link_debug(link, "Interface is under renaming, pending initialization.");
3295 return 0;
3296 }
3297
3298 r = link_initialized(link, device);
3299 if (r < 0)
3300 goto failed;
3301 } else {
3302 r = link_initialized_and_synced(link);
3303 if (r < 0)
3304 goto failed;
3305 }
3306
3307 return 0;
3308 failed:
3309 link_enter_failed(link);
3310 return r;
3311 }
3312
3313 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3314 int r;
3315
3316 assert(link);
3317
3318 log_link_info(link, "Gained IPv6LL");
3319
3320 link->ipv6ll_address = *address;
3321 link_check_ready(link);
3322
3323 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3324 r = link_acquire_ipv6_conf(link);
3325 if (r < 0) {
3326 link_enter_failed(link);
3327 return r;
3328 }
3329 }
3330
3331 return 0;
3332 }
3333
3334 static int link_carrier_gained(Link *link) {
3335 int r;
3336
3337 assert(link);
3338
3339 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3340 r = link_acquire_conf(link);
3341 if (r < 0) {
3342 link_enter_failed(link);
3343 return r;
3344 }
3345
3346 r = link_request_set_addresses(link);
3347 if (r < 0)
3348 return r;
3349 }
3350
3351 r = link_handle_bound_by_list(link);
3352 if (r < 0)
3353 return r;
3354
3355 return 0;
3356 }
3357
3358 static int link_carrier_lost(Link *link) {
3359 int r;
3360
3361 assert(link);
3362
3363 if (link->network && link->network->ignore_carrier_loss)
3364 return 0;
3365
3366 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3367 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3368 * configuration and stop the clients as well. */
3369 if (link->setting_mtu)
3370 return 0;
3371
3372 r = link_stop_clients(link, false);
3373 if (r < 0) {
3374 link_enter_failed(link);
3375 return r;
3376 }
3377
3378 if (link_dhcp4_server_enabled(link))
3379 (void) sd_dhcp_server_stop(link->dhcp_server);
3380
3381 r = link_drop_config(link);
3382 if (r < 0)
3383 return r;
3384
3385 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3386 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3387 r = link_drop_foreign_config(link);
3388 if (r < 0)
3389 return r;
3390 }
3391
3392 r = link_handle_bound_by_list(link);
3393 if (r < 0)
3394 return r;
3395
3396 return 0;
3397 }
3398
3399 int link_carrier_reset(Link *link) {
3400 int r;
3401
3402 assert(link);
3403
3404 if (link_has_carrier(link)) {
3405 r = link_carrier_lost(link);
3406 if (r < 0)
3407 return r;
3408
3409 r = link_carrier_gained(link);
3410 if (r < 0)
3411 return r;
3412
3413 log_link_info(link, "Reset carrier");
3414 }
3415
3416 return 0;
3417 }
3418
3419 int link_update(Link *link, sd_netlink_message *m) {
3420 struct ether_addr mac;
3421 const char *ifname;
3422 uint32_t mtu;
3423 bool had_carrier, carrier_gained, carrier_lost;
3424 int old_master, r;
3425
3426 assert(link);
3427 assert(link->ifname);
3428 assert(m);
3429
3430 if (link->state == LINK_STATE_LINGER) {
3431 log_link_info(link, "Link re-added");
3432 link_set_state(link, LINK_STATE_CONFIGURING);
3433
3434 r = link_new_carrier_maps(link);
3435 if (r < 0)
3436 return r;
3437 }
3438
3439 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3440 if (r >= 0 && !streq(ifname, link->ifname)) {
3441 Manager *manager = link->manager;
3442
3443 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3444
3445 link_drop(link);
3446 r = link_add(manager, m, &link);
3447 if (r < 0)
3448 return r;
3449 }
3450
3451 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3452 if (r >= 0 && mtu > 0) {
3453 link->mtu = mtu;
3454 if (link->original_mtu == 0) {
3455 link->original_mtu = mtu;
3456 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3457 }
3458
3459 if (link->dhcp_client) {
3460 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3461 link->mtu);
3462 if (r < 0)
3463 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3464 }
3465
3466 if (link->radv) {
3467 r = sd_radv_set_mtu(link->radv, link->mtu);
3468 if (r < 0)
3469 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3470 }
3471 }
3472
3473 /* The kernel may broadcast NEWLINK messages without the MAC address
3474 set, simply ignore them. */
3475 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3476 if (r >= 0) {
3477 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3478 ETH_ALEN)) {
3479
3480 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3481 ETH_ALEN);
3482
3483 log_link_debug(link, "MAC address: "
3484 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3485 mac.ether_addr_octet[0],
3486 mac.ether_addr_octet[1],
3487 mac.ether_addr_octet[2],
3488 mac.ether_addr_octet[3],
3489 mac.ether_addr_octet[4],
3490 mac.ether_addr_octet[5]);
3491
3492 if (link->ipv4ll) {
3493 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3494 if (r < 0)
3495 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3496 }
3497
3498 if (link->dhcp_client) {
3499 r = sd_dhcp_client_set_mac(link->dhcp_client,
3500 (const uint8_t *) &link->mac,
3501 sizeof (link->mac),
3502 ARPHRD_ETHER);
3503 if (r < 0)
3504 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3505
3506 r = dhcp4_set_client_identifier(link);
3507 if (r < 0)
3508 return r;
3509 }
3510
3511 if (link->dhcp6_client) {
3512 const DUID* duid = link_get_duid(link);
3513
3514 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3515 (const uint8_t *) &link->mac,
3516 sizeof (link->mac),
3517 ARPHRD_ETHER);
3518 if (r < 0)
3519 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3520
3521 if (link->network->iaid_set) {
3522 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3523 link->network->iaid);
3524 if (r < 0)
3525 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3526 }
3527
3528 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3529 duid->type,
3530 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3531 duid->raw_data_len);
3532 if (r < 0)
3533 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3534 }
3535
3536 if (link->radv) {
3537 r = sd_radv_set_mac(link->radv, &link->mac);
3538 if (r < 0)
3539 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3540 }
3541
3542 if (link->ndisc) {
3543 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3544 if (r < 0)
3545 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3546 }
3547 }
3548 }
3549
3550 old_master = link->master_ifindex;
3551 (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
3552
3553 had_carrier = link_has_carrier(link);
3554
3555 r = link_update_flags(link, m, old_master != link->master_ifindex);
3556 if (r < 0)
3557 return r;
3558
3559 r = link_update_lldp(link);
3560 if (r < 0)
3561 return r;
3562
3563 carrier_gained = !had_carrier && link_has_carrier(link);
3564 carrier_lost = had_carrier && !link_has_carrier(link);
3565
3566 if (carrier_gained) {
3567 log_link_info(link, "Gained carrier");
3568
3569 r = link_carrier_gained(link);
3570 if (r < 0)
3571 return r;
3572 } else if (carrier_lost) {
3573 log_link_info(link, "Lost carrier");
3574
3575 r = link_carrier_lost(link);
3576 if (r < 0)
3577 return r;
3578 }
3579
3580 return 0;
3581 }
3582
3583 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3584 bool space = false;
3585 Iterator i;
3586 Link *link;
3587
3588 assert(f);
3589 assert(prefix);
3590
3591 if (hashmap_isempty(h))
3592 return;
3593
3594 fputs(prefix, f);
3595 HASHMAP_FOREACH(link, h, i) {
3596 if (space)
3597 fputc(' ', f);
3598
3599 fprintf(f, "%i", link->ifindex);
3600 space = true;
3601 }
3602
3603 fputc('\n', f);
3604 }
3605
3606 int link_save(Link *link) {
3607 _cleanup_free_ char *temp_path = NULL;
3608 _cleanup_fclose_ FILE *f = NULL;
3609 const char *admin_state, *oper_state, *carrier_state, *address_state;
3610 Address *a;
3611 Route *route;
3612 Iterator i;
3613 int r;
3614
3615 assert(link);
3616 assert(link->state_file);
3617 assert(link->lease_file);
3618 assert(link->manager);
3619
3620 if (link->state == LINK_STATE_LINGER) {
3621 (void) unlink(link->state_file);
3622 return 0;
3623 }
3624
3625 link_lldp_save(link);
3626
3627 admin_state = link_state_to_string(link->state);
3628 assert(admin_state);
3629
3630 oper_state = link_operstate_to_string(link->operstate);
3631 assert(oper_state);
3632
3633 carrier_state = link_carrier_state_to_string(link->carrier_state);
3634 assert(carrier_state);
3635
3636 address_state = link_address_state_to_string(link->address_state);
3637 assert(address_state);
3638
3639 r = fopen_temporary(link->state_file, &f, &temp_path);
3640 if (r < 0)
3641 goto fail;
3642
3643 (void) fchmod(fileno(f), 0644);
3644
3645 fprintf(f,
3646 "# This is private data. Do not parse.\n"
3647 "ADMIN_STATE=%s\n"
3648 "OPER_STATE=%s\n"
3649 "CARRIER_STATE=%s\n"
3650 "ADDRESS_STATE=%s\n",
3651 admin_state, oper_state, carrier_state, address_state);
3652
3653 if (link->network) {
3654 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
3655 const char *dhcp_domainname = NULL, *p;
3656 sd_dhcp6_lease *dhcp6_lease = NULL;
3657 unsigned j;
3658 bool space;
3659
3660 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3661 yes_no(link->network->required_for_online));
3662
3663 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
3664 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
3665
3666 if (link->dhcp6_client) {
3667 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3668 if (r < 0 && r != -ENOMSG)
3669 log_link_debug(link, "No DHCPv6 lease");
3670 }
3671
3672 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3673
3674 fputs("DNS=", f);
3675 space = false;
3676
3677 for (j = 0; j < link->network->n_dns; j++) {
3678 _cleanup_free_ char *b = NULL;
3679
3680 r = in_addr_to_string(link->network->dns[j].family,
3681 &link->network->dns[j].address, &b);
3682 if (r < 0) {
3683 log_debug_errno(r, "Failed to format address, ignoring: %m");
3684 continue;
3685 }
3686
3687 if (space)
3688 fputc(' ', f);
3689 fputs(b, f);
3690 space = true;
3691 }
3692
3693 if (link->network->dhcp_use_dns &&
3694 link->dhcp_lease) {
3695 const struct in_addr *addresses;
3696
3697 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3698 if (r > 0)
3699 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3700 space = true;
3701 }
3702
3703 if (link->network->dhcp_use_dns && dhcp6_lease) {
3704 struct in6_addr *in6_addrs;
3705
3706 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3707 if (r > 0) {
3708 if (space)
3709 fputc(' ', f);
3710 serialize_in6_addrs(f, in6_addrs, r);
3711 space = true;
3712 }
3713 }
3714
3715 /* Make sure to flush out old entries before we use the NDISC data */
3716 ndisc_vacuum(link);
3717
3718 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3719 NDiscRDNSS *dd;
3720
3721 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3722 if (space)
3723 fputc(' ', f);
3724
3725 serialize_in6_addrs(f, &dd->address, 1);
3726 space = true;
3727 }
3728 }
3729
3730 fputc('\n', f);
3731
3732 fputs("NTP=", f);
3733 space = false;
3734 fputstrv(f, link->network->ntp, NULL, &space);
3735
3736 if (link->network->dhcp_use_ntp &&
3737 link->dhcp_lease) {
3738 const struct in_addr *addresses;
3739
3740 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3741 if (r > 0)
3742 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3743 space = true;
3744 }
3745
3746 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3747 struct in6_addr *in6_addrs;
3748 char **hosts;
3749
3750 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3751 &in6_addrs);
3752 if (r > 0) {
3753 if (space)
3754 fputc(' ', f);
3755 serialize_in6_addrs(f, in6_addrs, r);
3756 space = true;
3757 }
3758
3759 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3760 if (r > 0)
3761 fputstrv(f, hosts, NULL, &space);
3762 }
3763
3764 fputc('\n', f);
3765
3766 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3767 if (link->dhcp_lease) {
3768 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3769 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3770 }
3771 if (dhcp6_lease)
3772 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3773 }
3774
3775 fputs("DOMAINS=", f);
3776 space = false;
3777 ORDERED_SET_FOREACH(p, link->network->search_domains, i)
3778 fputs_with_space(f, p, NULL, &space);
3779
3780 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3781 NDiscDNSSL *dd;
3782
3783 if (dhcp_domainname)
3784 fputs_with_space(f, dhcp_domainname, NULL, &space);
3785 if (dhcp_domains)
3786 fputstrv(f, dhcp_domains, NULL, &space);
3787 if (dhcp6_domains)
3788 fputstrv(f, dhcp6_domains, NULL, &space);
3789
3790 SET_FOREACH(dd, link->ndisc_dnssl, i)
3791 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3792 }
3793
3794 fputc('\n', f);
3795
3796 fputs("ROUTE_DOMAINS=", f);
3797 space = false;
3798 ORDERED_SET_FOREACH(p, link->network->route_domains, i)
3799 fputs_with_space(f, p, NULL, &space);
3800
3801 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3802 NDiscDNSSL *dd;
3803
3804 if (dhcp_domainname)
3805 fputs_with_space(f, dhcp_domainname, NULL, &space);
3806 if (dhcp_domains)
3807 fputstrv(f, dhcp_domains, NULL, &space);
3808 if (dhcp6_domains)
3809 fputstrv(f, dhcp6_domains, NULL, &space);
3810
3811 SET_FOREACH(dd, link->ndisc_dnssl, i)
3812 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3813 }
3814
3815 fputc('\n', f);
3816
3817 fprintf(f, "LLMNR=%s\n",
3818 resolve_support_to_string(link->network->llmnr));
3819 fprintf(f, "MDNS=%s\n",
3820 resolve_support_to_string(link->network->mdns));
3821 if (link->network->dns_default_route >= 0)
3822 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
3823
3824 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3825 fprintf(f, "DNS_OVER_TLS=%s\n",
3826 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
3827
3828 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3829 fprintf(f, "DNSSEC=%s\n",
3830 dnssec_mode_to_string(link->network->dnssec_mode));
3831
3832 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3833 const char *n;
3834
3835 fputs("DNSSEC_NTA=", f);
3836 space = false;
3837 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3838 fputs_with_space(f, n, NULL, &space);
3839 fputc('\n', f);
3840 }
3841
3842 fputs("ADDRESSES=", f);
3843 space = false;
3844 SET_FOREACH(a, link->addresses, i) {
3845 _cleanup_free_ char *address_str = NULL;
3846
3847 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3848 if (r < 0)
3849 goto fail;
3850
3851 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3852 space = true;
3853 }
3854 fputc('\n', f);
3855
3856 fputs("ROUTES=", f);
3857 space = false;
3858 SET_FOREACH(route, link->routes, i) {
3859 _cleanup_free_ char *route_str = NULL;
3860
3861 r = in_addr_to_string(route->family, &route->dst, &route_str);
3862 if (r < 0)
3863 goto fail;
3864
3865 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
3866 space ? " " : "", route_str,
3867 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3868 space = true;
3869 }
3870
3871 fputc('\n', f);
3872 }
3873
3874 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3875 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3876
3877 if (link->dhcp_lease) {
3878 struct in_addr address;
3879 const char *tz = NULL;
3880
3881 assert(link->network);
3882
3883 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3884 if (r >= 0)
3885 fprintf(f, "TIMEZONE=%s\n", tz);
3886
3887 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3888 if (r >= 0) {
3889 fputs("DHCP4_ADDRESS=", f);
3890 serialize_in_addrs(f, &address, 1, false, NULL);
3891 fputc('\n', f);
3892 }
3893
3894 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3895 if (r < 0)
3896 goto fail;
3897
3898 fprintf(f,
3899 "DHCP_LEASE=%s\n",
3900 link->lease_file);
3901 } else
3902 (void) unlink(link->lease_file);
3903
3904 if (link->ipv4ll) {
3905 struct in_addr address;
3906
3907 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3908 if (r >= 0) {
3909 fputs("IPV4LL_ADDRESS=", f);
3910 serialize_in_addrs(f, &address, 1, false, NULL);
3911 fputc('\n', f);
3912 }
3913 }
3914
3915 r = fflush_and_check(f);
3916 if (r < 0)
3917 goto fail;
3918
3919 if (rename(temp_path, link->state_file) < 0) {
3920 r = -errno;
3921 goto fail;
3922 }
3923
3924 return 0;
3925
3926 fail:
3927 (void) unlink(link->state_file);
3928 if (temp_path)
3929 (void) unlink(temp_path);
3930
3931 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3932 }
3933
3934 /* The serialized state in /run is no longer up-to-date. */
3935 void link_dirty(Link *link) {
3936 int r;
3937
3938 assert(link);
3939
3940 /* mark manager dirty as link is dirty */
3941 manager_dirty(link->manager);
3942
3943 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3944 if (r < 0)
3945 /* allocation errors are ignored */
3946 return;
3947
3948 r = set_put(link->manager->dirty_links, link);
3949 if (r <= 0)
3950 /* don't take another ref if the link was already dirty */
3951 return;
3952
3953 link_ref(link);
3954 }
3955
3956 /* The serialized state in /run is up-to-date */
3957 void link_clean(Link *link) {
3958 assert(link);
3959 assert(link->manager);
3960
3961 link_unref(set_remove(link->manager->dirty_links, link));
3962 }
3963
3964 static const char* const link_state_table[_LINK_STATE_MAX] = {
3965 [LINK_STATE_PENDING] = "pending",
3966 [LINK_STATE_INITIALIZED] = "initialized",
3967 [LINK_STATE_CONFIGURING] = "configuring",
3968 [LINK_STATE_CONFIGURED] = "configured",
3969 [LINK_STATE_UNMANAGED] = "unmanaged",
3970 [LINK_STATE_FAILED] = "failed",
3971 [LINK_STATE_LINGER] = "linger",
3972 };
3973
3974 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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