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Merge pull request #12912 from yuwata/network-move-functions
[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-dhcp-server.h"
23 #include "networkd-dhcp4.h"
24 #include "networkd-dhcp6.h"
25 #include "networkd-ipv4ll.h"
26 #include "networkd-ipv6-proxy-ndp.h"
27 #include "networkd-link-bus.h"
28 #include "networkd-link.h"
29 #include "networkd-lldp-tx.h"
30 #include "networkd-manager.h"
31 #include "networkd-ndisc.h"
32 #include "networkd-neighbor.h"
33 #include "networkd-radv.h"
34 #include "networkd-routing-policy-rule.h"
35 #include "set.h"
36 #include "socket-util.h"
37 #include "stdio-util.h"
38 #include "string-table.h"
39 #include "strv.h"
40 #include "sysctl-util.h"
41 #include "tmpfile-util.h"
42 #include "udev-util.h"
43 #include "util.h"
44 #include "virt.h"
45
46 uint32_t link_get_vrf_table(Link *link) {
47 return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
48 }
49
50 uint32_t link_get_dhcp_route_table(Link *link) {
51 /* When the interface is part of an VRF use the VRFs routing table, unless
52 * another table is explicitly specified. */
53 if (link->network->dhcp_route_table_set)
54 return link->network->dhcp_route_table;
55 return link_get_vrf_table(link);
56 }
57
58 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
59 if (link->network->ipv6_accept_ra_route_table_set)
60 return link->network->ipv6_accept_ra_route_table;
61 return link_get_vrf_table(link);
62 }
63
64 DUID* link_get_duid(Link *link) {
65 if (link->network->duid.type != _DUID_TYPE_INVALID)
66 return &link->network->duid;
67 else
68 return &link->manager->duid;
69 }
70
71 int link_sysctl_ipv6_enabled(Link *link) {
72 _cleanup_free_ char *value = NULL;
73 int r;
74
75 r = sysctl_read_ip_property(AF_INET6, link->ifname, "disable_ipv6", &value);
76 if (r < 0)
77 return log_link_warning_errno(link, r,
78 "Failed to read net.ipv6.conf.%s.disable_ipv6 sysctl property: %m",
79 link->ifname);
80
81 link->sysctl_ipv6_enabled = value[0] == '0';
82 return link->sysctl_ipv6_enabled;
83 }
84
85 static bool link_dhcp6_enabled(Link *link) {
86 assert(link);
87
88 if (!socket_ipv6_is_supported())
89 return false;
90
91 if (link->flags & IFF_LOOPBACK)
92 return false;
93
94 if (!link->network)
95 return false;
96
97 if (link->network->bond)
98 return false;
99
100 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
101 return false;
102
103 if (link_sysctl_ipv6_enabled(link) == 0)
104 return false;
105
106 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
107 }
108
109 static bool link_dhcp4_enabled(Link *link) {
110 assert(link);
111
112 if (link->flags & IFF_LOOPBACK)
113 return false;
114
115 if (!link->network)
116 return false;
117
118 if (link->network->bond)
119 return false;
120
121 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
122 return false;
123
124 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
125 }
126
127 static bool link_dhcp4_server_enabled(Link *link) {
128 assert(link);
129
130 if (link->flags & IFF_LOOPBACK)
131 return false;
132
133 if (!link->network)
134 return false;
135
136 if (link->network->bond)
137 return false;
138
139 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
140 return false;
141
142 return link->network->dhcp_server;
143 }
144
145 bool link_ipv4ll_enabled(Link *link, AddressFamilyBoolean mask) {
146 assert(link);
147 assert((mask & ~(ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) == 0);
148
149 if (link->flags & IFF_LOOPBACK)
150 return false;
151
152 if (!link->network)
153 return false;
154
155 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "ip6gre", "ip6tnl", "sit", "vti", "vti6", "can", "vcan", "vxcan", "nlmon"))
156 return false;
157
158 /* L3 or L3S mode do not support ARP. */
159 if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S))
160 return false;
161
162 if (link->network->bond)
163 return false;
164
165 if (link->network->bond)
166 return false;
167
168 return link->network->link_local & mask;
169 }
170
171 static bool link_ipv6ll_enabled(Link *link) {
172 assert(link);
173
174 if (!socket_ipv6_is_supported())
175 return false;
176
177 if (link->flags & IFF_LOOPBACK)
178 return false;
179
180 if (!link->network)
181 return false;
182
183 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "sit", "vti", "can", "vcan", "vxcan", "nlmon"))
184 return false;
185
186 if (link->network->bond)
187 return false;
188
189 if (link_sysctl_ipv6_enabled(link) == 0)
190 return false;
191
192 return link->network->link_local & ADDRESS_FAMILY_IPV6;
193 }
194
195 static bool link_ipv6_enabled(Link *link) {
196 assert(link);
197
198 if (!socket_ipv6_is_supported())
199 return false;
200
201 if (link->network->bond)
202 return false;
203
204 if (link_sysctl_ipv6_enabled(link) == 0)
205 return false;
206
207 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
208 return false;
209
210 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
211 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
212 }
213
214 static bool link_radv_enabled(Link *link) {
215 assert(link);
216
217 if (!link_ipv6ll_enabled(link))
218 return false;
219
220 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
221 }
222
223 static bool link_ipv4_forward_enabled(Link *link) {
224 assert(link);
225
226 if (link->flags & IFF_LOOPBACK)
227 return false;
228
229 if (!link->network)
230 return false;
231
232 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
233 return false;
234
235 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
236 }
237
238 static bool link_ipv6_forward_enabled(Link *link) {
239 assert(link);
240
241 if (!socket_ipv6_is_supported())
242 return false;
243
244 if (link->flags & IFF_LOOPBACK)
245 return false;
246
247 if (!link->network)
248 return false;
249
250 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
251 return false;
252
253 if (link_sysctl_ipv6_enabled(link) == 0)
254 return false;
255
256 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
257 }
258
259 static bool link_proxy_arp_enabled(Link *link) {
260 assert(link);
261
262 if (link->flags & IFF_LOOPBACK)
263 return false;
264
265 if (!link->network)
266 return false;
267
268 if (link->network->proxy_arp < 0)
269 return false;
270
271 return true;
272 }
273
274 static bool link_ipv6_accept_ra_enabled(Link *link) {
275 assert(link);
276
277 if (!socket_ipv6_is_supported())
278 return false;
279
280 if (link->flags & IFF_LOOPBACK)
281 return false;
282
283 if (!link->network)
284 return false;
285
286 if (!link_ipv6ll_enabled(link))
287 return false;
288
289 /* If unset use system default (enabled if local forwarding is disabled.
290 * disabled if local forwarding is enabled).
291 * If set, ignore or enforce RA independent of local forwarding state.
292 */
293 if (link->network->ipv6_accept_ra < 0)
294 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
295 return !link_ipv6_forward_enabled(link);
296 else if (link->network->ipv6_accept_ra > 0)
297 /* accept RA even if ip_forward is enabled */
298 return true;
299 else
300 /* ignore RA */
301 return false;
302 }
303
304 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
305 assert(link);
306
307 if (!socket_ipv6_is_supported())
308 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
309
310 if (link->flags & IFF_LOOPBACK)
311 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
312
313 if (!link->network)
314 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
315
316 return link->network->ipv6_privacy_extensions;
317 }
318
319 static int link_enable_ipv6(Link *link) {
320 bool disabled;
321 int r;
322
323 if (link->flags & IFF_LOOPBACK)
324 return 0;
325
326 disabled = !link_ipv6_enabled(link);
327
328 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", disabled);
329 if (r < 0)
330 log_link_warning_errno(link, r, "Cannot %s IPv6: %m", enable_disable(!disabled));
331 else
332 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
333
334 return 0;
335 }
336
337 static bool link_is_enslaved(Link *link) {
338 if (link->flags & IFF_SLAVE)
339 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
340 return true;
341
342 if (!link->network)
343 return false;
344
345 if (link->master_ifindex > 0 && link->network->bridge)
346 return true;
347
348 /* TODO: add conditions for other netdevs. */
349
350 return false;
351 }
352
353 static void link_update_master_operstate(Link *link, NetDev *netdev) {
354 Link *master;
355
356 if (!netdev)
357 return;
358
359 if (link_get(link->manager, netdev->ifindex, &master) < 0)
360 return;
361
362 link_update_operstate(master, true);
363 }
364
365 void link_update_operstate(Link *link, bool also_update_master) {
366 LinkOperationalState operstate;
367 LinkCarrierState carrier_state;
368 LinkAddressState address_state;
369 _cleanup_strv_free_ char **p = NULL;
370 uint8_t scope = RT_SCOPE_NOWHERE;
371 bool changed = false;
372 Address *address;
373 Iterator i;
374
375 assert(link);
376
377 if (link->kernel_operstate == IF_OPER_DORMANT)
378 carrier_state = LINK_CARRIER_STATE_DORMANT;
379 else if (link_has_carrier(link)) {
380 if (link_is_enslaved(link))
381 carrier_state = LINK_CARRIER_STATE_ENSLAVED;
382 else
383 carrier_state = LINK_CARRIER_STATE_CARRIER;
384 } else if (link->flags & IFF_UP)
385 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
386 else
387 carrier_state = LINK_CARRIER_STATE_OFF;
388
389 if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
390 Link *slave;
391
392 SET_FOREACH(slave, link->slaves, i) {
393 link_update_operstate(slave, false);
394
395 if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
396 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
397 }
398 }
399
400 SET_FOREACH(address, link->addresses, i) {
401 if (!address_is_ready(address))
402 continue;
403
404 if (address->scope < scope)
405 scope = address->scope;
406 }
407
408 /* for operstate we also take foreign addresses into account */
409 SET_FOREACH(address, link->addresses_foreign, i) {
410 if (!address_is_ready(address))
411 continue;
412
413 if (address->scope < scope)
414 scope = address->scope;
415 }
416
417 if (scope < RT_SCOPE_SITE)
418 /* universally accessible addresses found */
419 address_state = LINK_ADDRESS_STATE_ROUTABLE;
420 else if (scope < RT_SCOPE_HOST)
421 /* only link or site local addresses found */
422 address_state = LINK_ADDRESS_STATE_DEGRADED;
423 else
424 /* no useful addresses found */
425 address_state = LINK_ADDRESS_STATE_OFF;
426
427 /* Mapping of address and carrier state vs operational state
428 * carrier state
429 * | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
430 * ------------------------------------------------------------------------------
431 * off | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
432 * address_state degraded | off | no-carrier | dormant | degraded-carrier | degraded | enslaved
433 * routable | off | no-carrier | dormant | degraded-carrier | routable | routable
434 */
435
436 if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
437 operstate = (LinkOperationalState) carrier_state;
438 else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
439 operstate = LINK_OPERSTATE_ROUTABLE;
440 else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
441 operstate = LINK_OPERSTATE_DEGRADED;
442 else
443 operstate = LINK_OPERSTATE_ENSLAVED;
444
445 if (link->carrier_state != carrier_state) {
446 link->carrier_state = carrier_state;
447 changed = true;
448 if (strv_extend(&p, "CarrierState") < 0)
449 log_oom();
450 }
451
452 if (link->address_state != address_state) {
453 link->address_state = address_state;
454 changed = true;
455 if (strv_extend(&p, "AddressState") < 0)
456 log_oom();
457 }
458
459 if (link->operstate != operstate) {
460 link->operstate = operstate;
461 changed = true;
462 if (strv_extend(&p, "OperationalState") < 0)
463 log_oom();
464 }
465
466 if (p)
467 link_send_changed_strv(link, p);
468 if (changed)
469 link_dirty(link);
470
471 if (also_update_master && link->network) {
472 link_update_master_operstate(link, link->network->bond);
473 link_update_master_operstate(link, link->network->bridge);
474 }
475 }
476
477 #define FLAG_STRING(string, flag, old, new) \
478 (((old ^ new) & flag) \
479 ? ((old & flag) ? (" -" string) : (" +" string)) \
480 : "")
481
482 static int link_update_flags(Link *link, sd_netlink_message *m, bool force_update_operstate) {
483 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
484 uint8_t operstate;
485 int r;
486
487 assert(link);
488
489 r = sd_rtnl_message_link_get_flags(m, &flags);
490 if (r < 0)
491 return log_link_warning_errno(link, r, "Could not get link flags: %m");
492
493 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
494 if (r < 0)
495 /* if we got a message without operstate, take it to mean
496 the state was unchanged */
497 operstate = link->kernel_operstate;
498
499 if (!force_update_operstate && (link->flags == flags) && (link->kernel_operstate == operstate))
500 return 0;
501
502 if (link->flags != flags) {
503 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",
504 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
505 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
506 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
507 FLAG_STRING("UP", IFF_UP, link->flags, flags),
508 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
509 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
510 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
511 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
512 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
513 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
514 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
515 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
516 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
517 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
518 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
519 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
520 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
521 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
522 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
523
524 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
525 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
526 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
527 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
528 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
529 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
530 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
531 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
532
533 /* link flags are currently at most 18 bits, let's align to
534 * printing 20 */
535 if (unknown_flags_added)
536 log_link_debug(link,
537 "Unknown link flags gained: %#.5x (ignoring)",
538 unknown_flags_added);
539
540 if (unknown_flags_removed)
541 log_link_debug(link,
542 "Unknown link flags lost: %#.5x (ignoring)",
543 unknown_flags_removed);
544 }
545
546 link->flags = flags;
547 link->kernel_operstate = operstate;
548
549 link_update_operstate(link, true);
550
551 return 0;
552 }
553
554 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
555 _cleanup_(link_unrefp) Link *link = NULL;
556 uint16_t type;
557 const char *ifname, *kind = NULL;
558 int r, ifindex;
559 unsigned short iftype;
560
561 assert(manager);
562 assert(message);
563 assert(ret);
564
565 /* check for link kind */
566 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
567 if (r == 0) {
568 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
569 r = sd_netlink_message_exit_container(message);
570 if (r < 0)
571 return r;
572 }
573
574 r = sd_netlink_message_get_type(message, &type);
575 if (r < 0)
576 return r;
577 else if (type != RTM_NEWLINK)
578 return -EINVAL;
579
580 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
581 if (r < 0)
582 return r;
583 else if (ifindex <= 0)
584 return -EINVAL;
585
586 r = sd_rtnl_message_link_get_type(message, &iftype);
587 if (r < 0)
588 return r;
589
590 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
591 if (r < 0)
592 return r;
593
594 link = new(Link, 1);
595 if (!link)
596 return -ENOMEM;
597
598 *link = (Link) {
599 .n_ref = 1,
600 .manager = manager,
601 .state = LINK_STATE_PENDING,
602 .rtnl_extended_attrs = true,
603 .ifindex = ifindex,
604 .iftype = iftype,
605 .sysctl_ipv6_enabled = -1,
606 };
607
608 link->ifname = strdup(ifname);
609 if (!link->ifname)
610 return -ENOMEM;
611
612 if (kind) {
613 link->kind = strdup(kind);
614 if (!link->kind)
615 return -ENOMEM;
616 }
617
618 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
619 if (r < 0)
620 log_link_debug_errno(link, r, "New device has no master, continuing without");
621
622 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
623 if (r < 0)
624 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
625
626 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
627 return -ENOMEM;
628
629 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
630 return -ENOMEM;
631
632 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
633 return -ENOMEM;
634
635 r = hashmap_ensure_allocated(&manager->links, NULL);
636 if (r < 0)
637 return r;
638
639 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
640 if (r < 0)
641 return r;
642
643 r = link_update_flags(link, message, false);
644 if (r < 0)
645 return r;
646
647 *ret = TAKE_PTR(link);
648
649 return 0;
650 }
651
652 static Link *link_free(Link *link) {
653 Address *address;
654
655 assert(link);
656
657 link->routes = set_free_with_destructor(link->routes, route_free);
658 link->routes_foreign = set_free_with_destructor(link->routes_foreign, route_free);
659
660 link->addresses = set_free_with_destructor(link->addresses, address_free);
661 link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free);
662
663 while ((address = link->pool_addresses)) {
664 LIST_REMOVE(addresses, link->pool_addresses, address);
665 address_free(address);
666 }
667
668 sd_dhcp_server_unref(link->dhcp_server);
669 sd_dhcp_client_unref(link->dhcp_client);
670 sd_dhcp_lease_unref(link->dhcp_lease);
671
672 link_lldp_emit_stop(link);
673
674 free(link->lease_file);
675
676 sd_lldp_unref(link->lldp);
677 free(link->lldp_file);
678
679 ndisc_flush(link);
680
681 sd_ipv4ll_unref(link->ipv4ll);
682 sd_dhcp6_client_unref(link->dhcp6_client);
683 sd_ndisc_unref(link->ndisc);
684 sd_radv_unref(link->radv);
685
686 free(link->ifname);
687 free(link->kind);
688
689 (void) unlink(link->state_file);
690 free(link->state_file);
691
692 sd_device_unref(link->sd_device);
693
694 hashmap_free(link->bound_to_links);
695 hashmap_free(link->bound_by_links);
696
697 set_free_with_destructor(link->slaves, link_unref);
698
699 network_unref(link->network);
700
701 return mfree(link);
702 }
703
704 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
705
706 int link_get(Manager *m, int ifindex, Link **ret) {
707 Link *link;
708
709 assert(m);
710 assert(ifindex);
711 assert(ret);
712
713 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
714 if (!link)
715 return -ENODEV;
716
717 *ret = link;
718
719 return 0;
720 }
721
722 void link_set_state(Link *link, LinkState state) {
723 assert(link);
724
725 if (link->state == state)
726 return;
727
728 log_link_debug(link, "State changed: %s -> %s",
729 link_state_to_string(link->state),
730 link_state_to_string(state));
731
732 link->state = state;
733
734 link_send_changed(link, "AdministrativeState", NULL);
735 }
736
737 static void link_enter_unmanaged(Link *link) {
738 assert(link);
739
740 link_set_state(link, LINK_STATE_UNMANAGED);
741
742 link_dirty(link);
743 }
744
745 int link_stop_clients(Link *link, bool may_keep_dhcp) {
746 int r = 0, k;
747
748 assert(link);
749 assert(link->manager);
750 assert(link->manager->event);
751
752 dhcp4_release_old_lease(link);
753
754 if (link->dhcp_client && (!may_keep_dhcp || !link->network ||
755 !FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP))) {
756 k = sd_dhcp_client_stop(link->dhcp_client);
757 if (k < 0)
758 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
759 }
760
761 if (link->ipv4ll) {
762 k = sd_ipv4ll_stop(link->ipv4ll);
763 if (k < 0)
764 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
765 }
766
767 if (link->dhcp6_client) {
768 k = sd_dhcp6_client_stop(link->dhcp6_client);
769 if (k < 0)
770 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
771 }
772
773 if (link->ndisc) {
774 k = sd_ndisc_stop(link->ndisc);
775 if (k < 0)
776 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
777 }
778
779 if (link->radv) {
780 k = sd_radv_stop(link->radv);
781 if (k < 0)
782 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
783 }
784
785 link_lldp_emit_stop(link);
786 return r;
787 }
788
789 void link_enter_failed(Link *link) {
790 assert(link);
791
792 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
793 return;
794
795 log_link_warning(link, "Failed");
796
797 link_set_state(link, LINK_STATE_FAILED);
798
799 link_stop_clients(link, false);
800
801 link_dirty(link);
802 }
803
804 static int link_join_netdevs_after_configured(Link *link) {
805 NetDev *netdev;
806 Iterator i;
807 int r;
808
809 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
810 if (netdev->ifindex > 0)
811 /* Assume already enslaved. */
812 continue;
813
814 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
815 continue;
816
817 log_struct(LOG_DEBUG,
818 LOG_LINK_INTERFACE(link),
819 LOG_NETDEV_INTERFACE(netdev),
820 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
821
822 r = netdev_join(netdev, link, NULL);
823 if (r < 0)
824 return log_struct_errno(LOG_WARNING, r,
825 LOG_LINK_INTERFACE(link),
826 LOG_NETDEV_INTERFACE(netdev),
827 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
828 }
829
830 return 0;
831 }
832
833 static void link_enter_configured(Link *link) {
834 assert(link);
835 assert(link->network);
836
837 if (link->state != LINK_STATE_CONFIGURING)
838 return;
839
840 log_link_info(link, "Configured");
841
842 link_set_state(link, LINK_STATE_CONFIGURED);
843
844 (void) link_join_netdevs_after_configured(link);
845
846 link_dirty(link);
847 }
848
849 static int link_request_set_routing_policy_rule(Link *link) {
850 RoutingPolicyRule *rule, *rrule = NULL;
851 int r;
852
853 assert(link);
854 assert(link->network);
855
856 link_set_state(link, LINK_STATE_CONFIGURING);
857 link->routing_policy_rules_configured = false;
858
859 LIST_FOREACH(rules, rule, link->network->rules) {
860 r = routing_policy_rule_get(link->manager, rule, &rrule);
861 if (r >= 0) {
862 if (r == 0)
863 (void) routing_policy_rule_make_local(link->manager, rrule);
864 continue;
865 }
866
867 r = routing_policy_rule_configure(rule, link, NULL);
868 if (r < 0) {
869 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
870 link_enter_failed(link);
871 return r;
872 }
873 if (r > 0)
874 link->routing_policy_rule_messages++;
875 }
876
877 routing_policy_rule_purge(link->manager, link);
878 if (link->routing_policy_rule_messages == 0) {
879 link->routing_policy_rules_configured = true;
880 link_check_ready(link);
881 } else
882 log_link_debug(link, "Setting routing policy rules");
883
884 return 0;
885 }
886
887 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
888 int r;
889
890 assert(link);
891 assert(link->route_messages > 0);
892 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
893 LINK_STATE_FAILED, LINK_STATE_LINGER));
894
895 link->route_messages--;
896
897 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
898 return 1;
899
900 r = sd_netlink_message_get_errno(m);
901 if (r < 0 && r != -EEXIST)
902 log_link_warning_errno(link, r, "Could not set route: %m");
903
904 if (link->route_messages == 0) {
905 log_link_debug(link, "Routes set");
906 link->static_routes_configured = true;
907 link_check_ready(link);
908 }
909
910 return 1;
911 }
912
913 int link_request_set_routes(Link *link) {
914 enum {
915 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
916 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
917 _PHASE_MAX
918 } phase;
919 Route *rt;
920 int r;
921
922 assert(link);
923 assert(link->network);
924 assert(link->addresses_configured);
925 assert(link->address_messages == 0);
926 assert(link->state != _LINK_STATE_INVALID);
927
928 link_set_state(link, LINK_STATE_CONFIGURING);
929 link->static_routes_configured = false;
930
931 r = link_request_set_routing_policy_rule(link);
932 if (r < 0)
933 return r;
934
935 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
936 for (phase = 0; phase < _PHASE_MAX; phase++)
937 LIST_FOREACH(routes, rt, link->network->static_routes) {
938
939 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
940 continue;
941
942 r = route_configure(rt, link, route_handler);
943 if (r < 0) {
944 log_link_warning_errno(link, r, "Could not set routes: %m");
945 link_enter_failed(link);
946 return r;
947 }
948 if (r > 0)
949 link->route_messages++;
950 }
951
952 if (link->route_messages == 0) {
953 link->static_routes_configured = true;
954 link_check_ready(link);
955 } else
956 log_link_debug(link, "Setting routes");
957
958 return 0;
959 }
960
961 void link_check_ready(Link *link) {
962 Address *a;
963 Iterator i;
964
965 assert(link);
966
967 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
968 return;
969
970 if (!link->network)
971 return;
972
973 if (!link->addresses_configured)
974 return;
975
976 if (!link->neighbors_configured)
977 return;
978
979 SET_FOREACH(a, link->addresses, i)
980 if (!address_is_ready(a))
981 return;
982
983 if (!link->addresses_ready) {
984 link->addresses_ready = true;
985 link_request_set_routes(link);
986 return;
987 }
988
989 if (!link->static_routes_configured)
990 return;
991
992 if (!link->routing_policy_rules_configured)
993 return;
994
995 if (link_has_carrier(link) || !link->network->configure_without_carrier) {
996
997 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !(link->ipv4ll_address && link->ipv4ll_route))
998 return;
999
1000 if (link_ipv6ll_enabled(link) &&
1001 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
1002 return;
1003
1004 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
1005 !link->dhcp4_configured &&
1006 !link->dhcp6_configured &&
1007 !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address && link->ipv4ll_route))
1008 /* When DHCP is enabled, at least one protocol must provide an address, or
1009 * an IPv4ll fallback address must be configured. */
1010 return;
1011
1012 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
1013 return;
1014 }
1015
1016 if (link->state != LINK_STATE_CONFIGURED)
1017 link_enter_configured(link);
1018
1019 return;
1020 }
1021
1022 static int link_request_set_neighbors(Link *link) {
1023 Neighbor *neighbor;
1024 int r;
1025
1026 assert(link);
1027 assert(link->network);
1028 assert(link->state != _LINK_STATE_INVALID);
1029
1030 link_set_state(link, LINK_STATE_CONFIGURING);
1031 link->neighbors_configured = false;
1032
1033 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1034 r = neighbor_configure(neighbor, link, NULL);
1035 if (r < 0) {
1036 log_link_warning_errno(link, r, "Could not set neighbor: %m");
1037 link_enter_failed(link);
1038 return r;
1039 }
1040 }
1041
1042 if (link->neighbor_messages == 0) {
1043 link->neighbors_configured = true;
1044 link_check_ready(link);
1045 } else
1046 log_link_debug(link, "Setting neighbors");
1047
1048 return 0;
1049 }
1050
1051 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1052 int r;
1053
1054 assert(rtnl);
1055 assert(m);
1056 assert(link);
1057 assert(link->ifname);
1058 assert(link->address_messages > 0);
1059 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1060 LINK_STATE_FAILED, LINK_STATE_LINGER));
1061
1062 link->address_messages--;
1063
1064 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1065 return 1;
1066
1067 r = sd_netlink_message_get_errno(m);
1068 if (r < 0 && r != -EEXIST)
1069 log_link_warning_errno(link, r, "could not set address: %m");
1070 else if (r >= 0)
1071 manager_rtnl_process_address(rtnl, m, link->manager);
1072
1073 if (link->address_messages == 0) {
1074 log_link_debug(link, "Addresses set");
1075 link->addresses_configured = true;
1076 link_check_ready(link);
1077 }
1078
1079 return 1;
1080 }
1081
1082 static int link_set_bridge_fdb(Link *link) {
1083 FdbEntry *fdb_entry;
1084 int r;
1085
1086 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1087 r = fdb_entry_configure(link, fdb_entry);
1088 if (r < 0)
1089 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1090 }
1091
1092 return 0;
1093 }
1094
1095 static int link_request_set_addresses(Link *link) {
1096 AddressLabel *label;
1097 Address *ad;
1098 int r;
1099
1100 assert(link);
1101 assert(link->network);
1102 assert(link->state != _LINK_STATE_INVALID);
1103
1104 link_set_state(link, LINK_STATE_CONFIGURING);
1105
1106 /* Reset all *_configured flags we are configuring. */
1107 link->addresses_configured = false;
1108 link->addresses_ready = false;
1109 link->neighbors_configured = false;
1110 link->static_routes_configured = false;
1111 link->routing_policy_rules_configured = false;
1112
1113 r = link_set_bridge_fdb(link);
1114 if (r < 0)
1115 return r;
1116
1117 r = link_request_set_neighbors(link);
1118 if (r < 0)
1119 return r;
1120
1121 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1122 bool update;
1123
1124 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1125
1126 r = address_configure(ad, link, address_handler, update);
1127 if (r < 0) {
1128 log_link_warning_errno(link, r, "Could not set addresses: %m");
1129 link_enter_failed(link);
1130 return r;
1131 }
1132 if (r > 0)
1133 link->address_messages++;
1134 }
1135
1136 LIST_FOREACH(labels, label, link->network->address_labels) {
1137 r = address_label_configure(label, link, NULL, false);
1138 if (r < 0) {
1139 log_link_warning_errno(link, r, "Could not set address label: %m");
1140 link_enter_failed(link);
1141 return r;
1142 }
1143
1144 link->address_label_messages++;
1145 }
1146
1147 /* now that we can figure out a default address for the dhcp server,
1148 start it */
1149 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1150 r = dhcp4_server_configure(link);
1151 if (r < 0) {
1152 link_enter_failed(link);
1153 return r;
1154 }
1155 log_link_debug(link, "Offering DHCPv4 leases");
1156 }
1157
1158 if (link->address_messages == 0) {
1159 link->addresses_configured = true;
1160 link_check_ready(link);
1161 } else
1162 log_link_debug(link, "Setting addresses");
1163
1164 return 0;
1165 }
1166
1167 static int link_set_bridge_vlan(Link *link) {
1168 int r;
1169
1170 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1171 if (r < 0)
1172 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1173
1174 return r;
1175 }
1176
1177 static int link_set_proxy_arp(Link *link) {
1178 int r;
1179
1180 if (!link_proxy_arp_enabled(link))
1181 return 0;
1182
1183 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1184 if (r < 0)
1185 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1186
1187 return 0;
1188 }
1189
1190 static int link_configure_after_setting_mtu(Link *link);
1191
1192 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1193 int r;
1194
1195 assert(m);
1196 assert(link);
1197 assert(link->ifname);
1198
1199 link->setting_mtu = false;
1200
1201 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1202 return 1;
1203
1204 r = sd_netlink_message_get_errno(m);
1205 if (r < 0) {
1206 log_link_warning_errno(link, r, "Could not set MTU: %m");
1207 return 1;
1208 }
1209
1210 log_link_debug(link, "Setting MTU done.");
1211
1212 if (link->state == LINK_STATE_INITIALIZED)
1213 (void) link_configure_after_setting_mtu(link);
1214
1215 return 1;
1216 }
1217
1218 int link_set_mtu(Link *link, uint32_t mtu) {
1219 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1220 int r;
1221
1222 assert(link);
1223 assert(link->manager);
1224 assert(link->manager->rtnl);
1225
1226 if (mtu == 0 || link->setting_mtu)
1227 return 0;
1228
1229 if (link->mtu == mtu)
1230 return 0;
1231
1232 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1233
1234 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1235 if (r < 0)
1236 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1237
1238 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1239 * for this interface, then disable IPv6 else enable it. */
1240 (void) link_enable_ipv6(link);
1241
1242 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1243 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1244 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1245
1246 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1247 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1248
1249 mtu = IPV6_MIN_MTU;
1250 }
1251
1252 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1253 if (r < 0)
1254 return log_link_error_errno(link, r, "Could not append MTU: %m");
1255
1256 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1257 link_netlink_destroy_callback, link);
1258 if (r < 0)
1259 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1260
1261 link_ref(link);
1262 link->setting_mtu = true;
1263
1264 return 0;
1265 }
1266
1267 static bool link_reduces_vlan_mtu(Link *link) {
1268 /* See netif_reduces_vlan_mtu() in kernel. */
1269 return streq_ptr(link->kind, "macsec");
1270 }
1271
1272 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1273 uint32_t mtu = 0;
1274 NetDev *dev;
1275 Iterator i;
1276
1277 HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1278 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1279 /* See vlan_dev_change_mtu() in kernel. */
1280 mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1281
1282 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1283 /* See macvlan_change_mtu() in kernel. */
1284 mtu = dev->mtu;
1285
1286 return mtu;
1287 }
1288
1289 static int link_configure_mtu(Link *link) {
1290 uint32_t mtu;
1291
1292 assert(link);
1293 assert(link->network);
1294
1295 if (link->network->mtu > 0)
1296 return link_set_mtu(link, link->network->mtu);
1297
1298 mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1299 if (link->mtu >= mtu)
1300 return 0;
1301
1302 log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1303 "If it is not desired, then please explicitly specify MTUBytes= setting.",
1304 link->mtu, mtu);
1305
1306 return link_set_mtu(link, mtu);
1307 }
1308
1309 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1310 int r;
1311
1312 assert(m);
1313 assert(link);
1314 assert(link->ifname);
1315
1316 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1317 return 1;
1318
1319 r = sd_netlink_message_get_errno(m);
1320 if (r < 0)
1321 log_link_warning_errno(link, r, "Could not set link flags: %m");
1322
1323 return 1;
1324 }
1325
1326 static int link_set_flags(Link *link) {
1327 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1328 unsigned ifi_change = 0;
1329 unsigned ifi_flags = 0;
1330 int r;
1331
1332 assert(link);
1333 assert(link->manager);
1334 assert(link->manager->rtnl);
1335
1336 if (link->flags & IFF_LOOPBACK)
1337 return 0;
1338
1339 if (!link->network)
1340 return 0;
1341
1342 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1343 return 0;
1344
1345 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1346 if (r < 0)
1347 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1348
1349 if (link->network->arp >= 0) {
1350 ifi_change |= IFF_NOARP;
1351 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1352 }
1353
1354 if (link->network->multicast >= 0) {
1355 ifi_change |= IFF_MULTICAST;
1356 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1357 }
1358
1359 if (link->network->allmulticast >= 0) {
1360 ifi_change |= IFF_ALLMULTI;
1361 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1362 }
1363
1364 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1365 if (r < 0)
1366 return log_link_error_errno(link, r, "Could not set link flags: %m");
1367
1368 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1369 link_netlink_destroy_callback, link);
1370 if (r < 0)
1371 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1372
1373 link_ref(link);
1374
1375 return 0;
1376 }
1377
1378 static int link_acquire_ipv6_conf(Link *link) {
1379 int r;
1380
1381 assert(link);
1382
1383 if (link_ipv6_accept_ra_enabled(link)) {
1384 assert(link->ndisc);
1385
1386 log_link_debug(link, "Discovering IPv6 routers");
1387
1388 r = sd_ndisc_start(link->ndisc);
1389 if (r < 0 && r != -EBUSY)
1390 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1391 }
1392
1393 if (link_radv_enabled(link)) {
1394 assert(link->radv);
1395 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1396
1397 log_link_debug(link, "Starting IPv6 Router Advertisements");
1398
1399 r = sd_radv_start(link->radv);
1400 if (r < 0 && r != -EBUSY)
1401 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1402 }
1403
1404 (void) dhcp6_request_prefix_delegation(link);
1405
1406 return 0;
1407 }
1408
1409 static int link_acquire_ipv4_conf(Link *link) {
1410 int r;
1411
1412 assert(link);
1413 assert(link->manager);
1414 assert(link->manager->event);
1415
1416 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1417 assert(link->ipv4ll);
1418
1419 log_link_debug(link, "Acquiring IPv4 link-local address");
1420
1421 r = sd_ipv4ll_start(link->ipv4ll);
1422 if (r < 0)
1423 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1424 }
1425
1426 if (link_dhcp4_enabled(link)) {
1427 assert(link->dhcp_client);
1428
1429 log_link_debug(link, "Acquiring DHCPv4 lease");
1430
1431 r = sd_dhcp_client_start(link->dhcp_client);
1432 if (r < 0)
1433 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1434 }
1435
1436 return 0;
1437 }
1438
1439 static int link_acquire_conf(Link *link) {
1440 int r;
1441
1442 assert(link);
1443
1444 r = link_acquire_ipv4_conf(link);
1445 if (r < 0)
1446 return r;
1447
1448 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1449 r = link_acquire_ipv6_conf(link);
1450 if (r < 0)
1451 return r;
1452 }
1453
1454 if (link_lldp_emit_enabled(link)) {
1455 r = link_lldp_emit_start(link);
1456 if (r < 0)
1457 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1458 }
1459
1460 return 0;
1461 }
1462
1463 bool link_has_carrier(Link *link) {
1464 /* see Documentation/networking/operstates.txt in the kernel sources */
1465
1466 if (link->kernel_operstate == IF_OPER_UP)
1467 return true;
1468
1469 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1470 /* operstate may not be implemented, so fall back to flags */
1471 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1472 !FLAGS_SET(link->flags, IFF_DORMANT))
1473 return true;
1474
1475 return false;
1476 }
1477
1478 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1479 int r;
1480
1481 assert(link);
1482
1483 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1484 return 1;
1485
1486 r = sd_netlink_message_get_errno(m);
1487 if (r < 0)
1488 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1489
1490 return 1;
1491 }
1492
1493 static int link_configure_addrgen_mode(Link *link) {
1494 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1495 uint8_t ipv6ll_mode;
1496 int r;
1497
1498 assert(link);
1499 assert(link->network);
1500 assert(link->manager);
1501 assert(link->manager->rtnl);
1502
1503 if (!socket_ipv6_is_supported())
1504 return 0;
1505
1506 log_link_debug(link, "Setting address genmode for link");
1507
1508 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1509 if (r < 0)
1510 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1511
1512 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1513 if (r < 0)
1514 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1515
1516 r = sd_netlink_message_open_container(req, AF_INET6);
1517 if (r < 0)
1518 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1519
1520 if (!link_ipv6ll_enabled(link))
1521 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1522 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1523 /* The file may not exist. And event if it exists, when stable_secret is unset,
1524 * reading the file fails with EIO. */
1525 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1526 else
1527 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1528
1529 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1530 if (r < 0)
1531 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1532
1533 r = sd_netlink_message_close_container(req);
1534 if (r < 0)
1535 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1536
1537 r = sd_netlink_message_close_container(req);
1538 if (r < 0)
1539 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1540
1541 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1542 link_netlink_destroy_callback, link);
1543 if (r < 0)
1544 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1545
1546 link_ref(link);
1547
1548 return 0;
1549 }
1550
1551 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1552 int r;
1553
1554 assert(link);
1555
1556 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1557 return 1;
1558
1559 r = sd_netlink_message_get_errno(m);
1560 if (r < 0)
1561 /* we warn but don't fail the link, as it may be brought up later */
1562 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1563
1564 return 1;
1565 }
1566
1567 static int link_up(Link *link) {
1568 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1569 int r;
1570
1571 assert(link);
1572 assert(link->network);
1573 assert(link->manager);
1574 assert(link->manager->rtnl);
1575
1576 log_link_debug(link, "Bringing link up");
1577
1578 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1579 if (r < 0)
1580 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1581
1582 /* set it free if not enslaved with networkd */
1583 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1584 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1585 if (r < 0)
1586 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1587 }
1588
1589 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1590 if (r < 0)
1591 return log_link_error_errno(link, r, "Could not set link flags: %m");
1592
1593 if (link->network->mac) {
1594 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1595 if (r < 0)
1596 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1597 }
1598
1599 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1600 link_netlink_destroy_callback, link);
1601 if (r < 0)
1602 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1603
1604 link_ref(link);
1605
1606 return 0;
1607 }
1608
1609 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1610 int r;
1611
1612 assert(link);
1613
1614 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1615 return 1;
1616
1617 r = sd_netlink_message_get_errno(m);
1618 if (r < 0)
1619 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1620
1621 return 1;
1622 }
1623
1624 int link_down(Link *link, link_netlink_message_handler_t callback) {
1625 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1626 int r;
1627
1628 assert(link);
1629 assert(link->manager);
1630 assert(link->manager->rtnl);
1631
1632 log_link_debug(link, "Bringing link down");
1633
1634 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1635 RTM_SETLINK, link->ifindex);
1636 if (r < 0)
1637 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1638
1639 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1640 if (r < 0)
1641 return log_link_error_errno(link, r, "Could not set link flags: %m");
1642
1643 r = netlink_call_async(link->manager->rtnl, NULL, req,
1644 callback ?: link_down_handler,
1645 link_netlink_destroy_callback, link);
1646 if (r < 0)
1647 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1648
1649 link_ref(link);
1650
1651 return 0;
1652 }
1653
1654 static int link_handle_bound_to_list(Link *link) {
1655 Link *l;
1656 Iterator i;
1657 int r;
1658 bool required_up = false;
1659 bool link_is_up = false;
1660
1661 assert(link);
1662
1663 if (hashmap_isempty(link->bound_to_links))
1664 return 0;
1665
1666 if (link->flags & IFF_UP)
1667 link_is_up = true;
1668
1669 HASHMAP_FOREACH (l, link->bound_to_links, i)
1670 if (link_has_carrier(l)) {
1671 required_up = true;
1672 break;
1673 }
1674
1675 if (!required_up && link_is_up) {
1676 r = link_down(link, NULL);
1677 if (r < 0)
1678 return r;
1679 } else if (required_up && !link_is_up) {
1680 r = link_up(link);
1681 if (r < 0)
1682 return r;
1683 }
1684
1685 return 0;
1686 }
1687
1688 static int link_handle_bound_by_list(Link *link) {
1689 Iterator i;
1690 Link *l;
1691 int r;
1692
1693 assert(link);
1694
1695 if (hashmap_isempty(link->bound_by_links))
1696 return 0;
1697
1698 HASHMAP_FOREACH (l, link->bound_by_links, i) {
1699 r = link_handle_bound_to_list(l);
1700 if (r < 0)
1701 return r;
1702 }
1703
1704 return 0;
1705 }
1706
1707 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1708 int r;
1709
1710 assert(link);
1711 assert(carrier);
1712
1713 if (link == carrier)
1714 return 0;
1715
1716 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1717 return 0;
1718
1719 r = hashmap_ensure_allocated(h, NULL);
1720 if (r < 0)
1721 return r;
1722
1723 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1724 if (r < 0)
1725 return r;
1726
1727 return 0;
1728 }
1729
1730 static int link_new_bound_by_list(Link *link) {
1731 Manager *m;
1732 Link *carrier;
1733 Iterator i;
1734 int r;
1735 bool list_updated = false;
1736
1737 assert(link);
1738 assert(link->manager);
1739
1740 m = link->manager;
1741
1742 HASHMAP_FOREACH(carrier, m->links, i) {
1743 if (!carrier->network)
1744 continue;
1745
1746 if (strv_isempty(carrier->network->bind_carrier))
1747 continue;
1748
1749 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
1750 r = link_put_carrier(link, carrier, &link->bound_by_links);
1751 if (r < 0)
1752 return r;
1753
1754 list_updated = true;
1755 }
1756 }
1757
1758 if (list_updated)
1759 link_dirty(link);
1760
1761 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
1762 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1763 if (r < 0)
1764 return r;
1765
1766 link_dirty(carrier);
1767 }
1768
1769 return 0;
1770 }
1771
1772 static int link_new_bound_to_list(Link *link) {
1773 Manager *m;
1774 Link *carrier;
1775 Iterator i;
1776 int r;
1777 bool list_updated = false;
1778
1779 assert(link);
1780 assert(link->manager);
1781
1782 if (!link->network)
1783 return 0;
1784
1785 if (strv_isempty(link->network->bind_carrier))
1786 return 0;
1787
1788 m = link->manager;
1789
1790 HASHMAP_FOREACH (carrier, m->links, i) {
1791 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
1792 r = link_put_carrier(link, carrier, &link->bound_to_links);
1793 if (r < 0)
1794 return r;
1795
1796 list_updated = true;
1797 }
1798 }
1799
1800 if (list_updated)
1801 link_dirty(link);
1802
1803 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
1804 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
1805 if (r < 0)
1806 return r;
1807
1808 link_dirty(carrier);
1809 }
1810
1811 return 0;
1812 }
1813
1814 static int link_new_carrier_maps(Link *link) {
1815 int r;
1816
1817 r = link_new_bound_by_list(link);
1818 if (r < 0)
1819 return r;
1820
1821 r = link_handle_bound_by_list(link);
1822 if (r < 0)
1823 return r;
1824
1825 r = link_new_bound_to_list(link);
1826 if (r < 0)
1827 return r;
1828
1829 r = link_handle_bound_to_list(link);
1830 if (r < 0)
1831 return r;
1832
1833 return 0;
1834 }
1835
1836 static void link_free_bound_to_list(Link *link) {
1837 Link *bound_to;
1838 Iterator i;
1839
1840 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
1841 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
1842
1843 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
1844 link_dirty(bound_to);
1845 }
1846
1847 return;
1848 }
1849
1850 static void link_free_bound_by_list(Link *link) {
1851 Link *bound_by;
1852 Iterator i;
1853
1854 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
1855 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
1856
1857 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
1858 link_dirty(bound_by);
1859 link_handle_bound_to_list(bound_by);
1860 }
1861 }
1862
1863 return;
1864 }
1865
1866 static void link_free_carrier_maps(Link *link) {
1867 bool list_updated = false;
1868
1869 assert(link);
1870
1871 if (!hashmap_isempty(link->bound_to_links)) {
1872 link_free_bound_to_list(link);
1873 list_updated = true;
1874 }
1875
1876 if (!hashmap_isempty(link->bound_by_links)) {
1877 link_free_bound_by_list(link);
1878 list_updated = true;
1879 }
1880
1881 if (list_updated)
1882 link_dirty(link);
1883
1884 return;
1885 }
1886
1887 static int link_append_to_master(Link *link, NetDev *netdev) {
1888 Link *master;
1889 int r;
1890
1891 assert(link);
1892 assert(netdev);
1893
1894 r = link_get(link->manager, netdev->ifindex, &master);
1895 if (r < 0)
1896 return r;
1897
1898 r = set_ensure_allocated(&master->slaves, NULL);
1899 if (r < 0)
1900 return r;
1901
1902 r = set_put(master->slaves, link);
1903 if (r < 0)
1904 return r;
1905
1906 link_ref(link);
1907 return 0;
1908 }
1909
1910 static void link_drop_from_master(Link *link, NetDev *netdev) {
1911 Link *master;
1912
1913 assert(link);
1914
1915 if (!link->manager || !netdev)
1916 return;
1917
1918 if (link_get(link->manager, netdev->ifindex, &master) < 0)
1919 return;
1920
1921 link_unref(set_remove(master->slaves, link));
1922 }
1923
1924 static void link_detach_from_manager(Link *link) {
1925 if (!link || !link->manager)
1926 return;
1927
1928 link_unref(set_remove(link->manager->links_requesting_uuid, link));
1929 link_clean(link);
1930
1931 /* The following must be called at last. */
1932 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
1933 link_unref(link);
1934 }
1935
1936 void link_drop(Link *link) {
1937 if (!link || link->state == LINK_STATE_LINGER)
1938 return;
1939
1940 link_set_state(link, LINK_STATE_LINGER);
1941
1942 link_free_carrier_maps(link);
1943
1944 if (link->network) {
1945 link_drop_from_master(link, link->network->bridge);
1946 link_drop_from_master(link, link->network->bond);
1947 }
1948
1949 log_link_debug(link, "Link removed");
1950
1951 (void) unlink(link->state_file);
1952 link_detach_from_manager(link);
1953 }
1954
1955 static int link_joined(Link *link) {
1956 int r;
1957
1958 assert(link);
1959 assert(link->network);
1960
1961 if (!hashmap_isempty(link->bound_to_links)) {
1962 r = link_handle_bound_to_list(link);
1963 if (r < 0)
1964 return r;
1965 } else if (!(link->flags & IFF_UP)) {
1966 r = link_up(link);
1967 if (r < 0) {
1968 link_enter_failed(link);
1969 return r;
1970 }
1971 }
1972
1973 if (link->network->bridge) {
1974 r = link_set_bridge(link);
1975 if (r < 0)
1976 log_link_error_errno(link, r, "Could not set bridge message: %m");
1977
1978 r = link_append_to_master(link, link->network->bridge);
1979 if (r < 0)
1980 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
1981 }
1982
1983 if (link->network->bond) {
1984 r = link_set_bond(link);
1985 if (r < 0)
1986 log_link_error_errno(link, r, "Could not set bond message: %m");
1987
1988 r = link_append_to_master(link, link->network->bond);
1989 if (r < 0)
1990 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
1991 }
1992
1993 if (link->network->use_br_vlan &&
1994 (link->network->bridge || streq_ptr("bridge", link->kind))) {
1995 r = link_set_bridge_vlan(link);
1996 if (r < 0)
1997 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
1998 }
1999
2000 /* Skip setting up addresses until it gets carrier,
2001 or it would try to set addresses twice,
2002 which is bad for non-idempotent steps. */
2003 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2004 return 0;
2005
2006 return link_request_set_addresses(link);
2007 }
2008
2009 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2010 int r;
2011
2012 assert(link);
2013 assert(link->network);
2014 assert(link->enslaving > 0);
2015
2016 link->enslaving--;
2017
2018 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2019 return 1;
2020
2021 r = sd_netlink_message_get_errno(m);
2022 if (r < 0 && r != -EEXIST) {
2023 log_link_error_errno(link, r, "Could not join netdev: %m");
2024 link_enter_failed(link);
2025 return 1;
2026 } else
2027 log_link_debug(link, "Joined netdev");
2028
2029 if (link->enslaving == 0) {
2030 link_joined(link);
2031 }
2032
2033 return 1;
2034 }
2035
2036 static int link_enter_join_netdev(Link *link) {
2037 NetDev *netdev;
2038 Iterator i;
2039 int r;
2040
2041 assert(link);
2042 assert(link->network);
2043 assert(link->state == LINK_STATE_INITIALIZED);
2044
2045 link_set_state(link, LINK_STATE_CONFIGURING);
2046
2047 link_dirty(link);
2048 link->enslaving = 0;
2049
2050 if (link->network->bond) {
2051 if (link->network->bond->state == NETDEV_STATE_READY &&
2052 link->network->bond->ifindex == link->master_ifindex)
2053 return link_joined(link);
2054
2055 log_struct(LOG_DEBUG,
2056 LOG_LINK_INTERFACE(link),
2057 LOG_NETDEV_INTERFACE(link->network->bond),
2058 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2059
2060 link->enslaving++;
2061
2062 r = netdev_join(link->network->bond, link, netdev_join_handler);
2063 if (r < 0) {
2064 log_struct_errno(LOG_WARNING, r,
2065 LOG_LINK_INTERFACE(link),
2066 LOG_NETDEV_INTERFACE(link->network->bond),
2067 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2068 link_enter_failed(link);
2069 return r;
2070 }
2071 }
2072
2073 if (link->network->bridge) {
2074 log_struct(LOG_DEBUG,
2075 LOG_LINK_INTERFACE(link),
2076 LOG_NETDEV_INTERFACE(link->network->bridge),
2077 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2078
2079 link->enslaving++;
2080
2081 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2082 if (r < 0) {
2083 log_struct_errno(LOG_WARNING, r,
2084 LOG_LINK_INTERFACE(link),
2085 LOG_NETDEV_INTERFACE(link->network->bridge),
2086 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2087 link_enter_failed(link);
2088 return r;
2089 }
2090 }
2091
2092 if (link->network->vrf) {
2093 log_struct(LOG_DEBUG,
2094 LOG_LINK_INTERFACE(link),
2095 LOG_NETDEV_INTERFACE(link->network->vrf),
2096 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2097
2098 link->enslaving++;
2099
2100 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2101 if (r < 0) {
2102 log_struct_errno(LOG_WARNING, r,
2103 LOG_LINK_INTERFACE(link),
2104 LOG_NETDEV_INTERFACE(link->network->vrf),
2105 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2106 link_enter_failed(link);
2107 return r;
2108 }
2109 }
2110
2111 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2112
2113 if (netdev->ifindex > 0)
2114 /* Assume already enslaved. */
2115 continue;
2116
2117 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2118 continue;
2119
2120 log_struct(LOG_DEBUG,
2121 LOG_LINK_INTERFACE(link),
2122 LOG_NETDEV_INTERFACE(netdev),
2123 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2124
2125 link->enslaving++;
2126
2127 r = netdev_join(netdev, link, netdev_join_handler);
2128 if (r < 0) {
2129 log_struct_errno(LOG_WARNING, r,
2130 LOG_LINK_INTERFACE(link),
2131 LOG_NETDEV_INTERFACE(netdev),
2132 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2133 link_enter_failed(link);
2134 return r;
2135 }
2136 }
2137
2138 if (link->enslaving == 0)
2139 return link_joined(link);
2140
2141 return 0;
2142 }
2143
2144 static int link_set_ipv4_forward(Link *link) {
2145 int r;
2146
2147 if (!link_ipv4_forward_enabled(link))
2148 return 0;
2149
2150 /* We propagate the forwarding flag from one interface to the
2151 * global setting one way. This means: as long as at least one
2152 * interface was configured at any time that had IP forwarding
2153 * enabled the setting will stay on for good. We do this
2154 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2155 * somewhat in sync (see below). */
2156
2157 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2158 if (r < 0)
2159 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2160
2161 return 0;
2162 }
2163
2164 static int link_set_ipv6_forward(Link *link) {
2165 int r;
2166
2167 if (!link_ipv6_forward_enabled(link))
2168 return 0;
2169
2170 /* On Linux, the IPv6 stack does not know a per-interface
2171 * packet forwarding setting: either packet forwarding is on
2172 * for all, or off for all. We hence don't bother with a
2173 * per-interface setting, but simply propagate the interface
2174 * flag, if it is set, to the global flag, one-way. Note that
2175 * while IPv4 would allow a per-interface flag, we expose the
2176 * same behaviour there and also propagate the setting from
2177 * one to all, to keep things simple (see above). */
2178
2179 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2180 if (r < 0)
2181 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2182
2183 return 0;
2184 }
2185
2186 static int link_set_ipv6_privacy_extensions(Link *link) {
2187 IPv6PrivacyExtensions s;
2188 int r;
2189
2190 s = link_ipv6_privacy_extensions(link);
2191 if (s < 0)
2192 return 0;
2193
2194 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2195 if (r < 0)
2196 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2197
2198 return 0;
2199 }
2200
2201 static int link_set_ipv6_accept_ra(Link *link) {
2202 int r;
2203
2204 /* Make this a NOP if IPv6 is not available */
2205 if (!socket_ipv6_is_supported())
2206 return 0;
2207
2208 if (link->flags & IFF_LOOPBACK)
2209 return 0;
2210
2211 if (!link->network)
2212 return 0;
2213
2214 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2215 if (r < 0)
2216 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2217
2218 return 0;
2219 }
2220
2221 static int link_set_ipv6_dad_transmits(Link *link) {
2222 int r;
2223
2224 /* Make this a NOP if IPv6 is not available */
2225 if (!socket_ipv6_is_supported())
2226 return 0;
2227
2228 if (link->flags & IFF_LOOPBACK)
2229 return 0;
2230
2231 if (!link->network)
2232 return 0;
2233
2234 if (link->network->ipv6_dad_transmits < 0)
2235 return 0;
2236
2237 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2238 if (r < 0)
2239 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2240
2241 return 0;
2242 }
2243
2244 static int link_set_ipv6_hop_limit(Link *link) {
2245 int r;
2246
2247 /* Make this a NOP if IPv6 is not available */
2248 if (!socket_ipv6_is_supported())
2249 return 0;
2250
2251 if (link->flags & IFF_LOOPBACK)
2252 return 0;
2253
2254 if (!link->network)
2255 return 0;
2256
2257 if (link->network->ipv6_hop_limit < 0)
2258 return 0;
2259
2260 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2261 if (r < 0)
2262 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2263
2264 return 0;
2265 }
2266
2267 static int link_set_ipv6_mtu(Link *link) {
2268 int r;
2269
2270 /* Make this a NOP if IPv6 is not available */
2271 if (!socket_ipv6_is_supported())
2272 return 0;
2273
2274 if (link->flags & IFF_LOOPBACK)
2275 return 0;
2276
2277 if (link->network->ipv6_mtu == 0)
2278 return 0;
2279
2280 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2281 if (r < 0)
2282 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2283
2284 return 0;
2285 }
2286
2287 static bool link_is_static_address_configured(Link *link, Address *address) {
2288 Address *net_address;
2289
2290 assert(link);
2291 assert(address);
2292
2293 if (!link->network)
2294 return false;
2295
2296 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2297 if (address_equal(net_address, address))
2298 return true;
2299
2300 return false;
2301 }
2302
2303 static bool link_is_static_route_configured(Link *link, Route *route) {
2304 Route *net_route;
2305
2306 assert(link);
2307 assert(route);
2308
2309 if (!link->network)
2310 return false;
2311
2312 LIST_FOREACH(routes, net_route, link->network->static_routes)
2313 if (route_equal(net_route, route))
2314 return true;
2315
2316 return false;
2317 }
2318
2319 static bool link_address_is_dynamic(Link *link, Address *address) {
2320 Route *route;
2321 Iterator i;
2322
2323 assert(link);
2324 assert(address);
2325
2326 if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2327 return true;
2328
2329 /* Even when the address is leased from a DHCP server, networkd assign the address
2330 * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2331 * corresponding routes with RTPROT_DHCP. */
2332 SET_FOREACH(route, link->routes_foreign, i) {
2333 if (route->protocol != RTPROT_DHCP)
2334 continue;
2335
2336 if (address->family != route->family)
2337 continue;
2338
2339 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2340 return true;
2341 }
2342
2343 return false;
2344 }
2345
2346 static int link_drop_foreign_config(Link *link) {
2347 Address *address;
2348 Route *route;
2349 Iterator i;
2350 int r;
2351
2352 SET_FOREACH(address, link->addresses_foreign, i) {
2353 /* we consider IPv6LL addresses to be managed by the kernel */
2354 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2355 continue;
2356
2357 if (link_address_is_dynamic(link, address)) {
2358 if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2359 continue;
2360 } else if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2361 continue;
2362
2363 if (link_is_static_address_configured(link, address)) {
2364 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2365 if (r < 0)
2366 return log_link_error_errno(link, r, "Failed to add address: %m");
2367 } else {
2368 r = address_remove(address, link, NULL);
2369 if (r < 0)
2370 return r;
2371 }
2372 }
2373
2374 SET_FOREACH(route, link->routes_foreign, i) {
2375 /* do not touch routes managed by the kernel */
2376 if (route->protocol == RTPROT_KERNEL)
2377 continue;
2378
2379 if (route->protocol == RTPROT_STATIC &&
2380 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2381 continue;
2382
2383 if (route->protocol == RTPROT_DHCP &&
2384 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2385 continue;
2386
2387 if (link_is_static_route_configured(link, route)) {
2388 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2389 if (r < 0)
2390 return r;
2391 } else {
2392 r = route_remove(route, link, NULL);
2393 if (r < 0)
2394 return r;
2395 }
2396 }
2397
2398 return 0;
2399 }
2400
2401 static int link_drop_config(Link *link) {
2402 Address *address, *pool_address;
2403 Route *route;
2404 Iterator i;
2405 int r;
2406
2407 SET_FOREACH(address, link->addresses, i) {
2408 /* we consider IPv6LL addresses to be managed by the kernel */
2409 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2410 continue;
2411
2412 r = address_remove(address, link, NULL);
2413 if (r < 0)
2414 return r;
2415
2416 /* If this address came from an address pool, clean up the pool */
2417 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2418 if (address_equal(address, pool_address)) {
2419 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2420 address_free(pool_address);
2421 break;
2422 }
2423 }
2424 }
2425
2426 SET_FOREACH(route, link->routes, i) {
2427 /* do not touch routes managed by the kernel */
2428 if (route->protocol == RTPROT_KERNEL)
2429 continue;
2430
2431 r = route_remove(route, link, NULL);
2432 if (r < 0)
2433 return r;
2434 }
2435
2436 ndisc_flush(link);
2437
2438 return 0;
2439 }
2440
2441 static int link_configure(Link *link) {
2442 int r;
2443
2444 assert(link);
2445 assert(link->network);
2446 assert(link->state == LINK_STATE_INITIALIZED);
2447
2448 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
2449 return link_configure_can(link);
2450
2451 /* Drop foreign config, but ignore loopback or critical devices.
2452 * We do not want to remove loopback address or addresses used for root NFS. */
2453 if (!(link->flags & IFF_LOOPBACK) &&
2454 link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
2455 r = link_drop_foreign_config(link);
2456 if (r < 0)
2457 return r;
2458 }
2459
2460 r = link_set_proxy_arp(link);
2461 if (r < 0)
2462 return r;
2463
2464 r = ipv6_proxy_ndp_addresses_configure(link);
2465 if (r < 0)
2466 return r;
2467
2468 r = link_set_ipv4_forward(link);
2469 if (r < 0)
2470 return r;
2471
2472 r = link_set_ipv6_forward(link);
2473 if (r < 0)
2474 return r;
2475
2476 r = link_set_ipv6_privacy_extensions(link);
2477 if (r < 0)
2478 return r;
2479
2480 r = link_set_ipv6_accept_ra(link);
2481 if (r < 0)
2482 return r;
2483
2484 r = link_set_ipv6_dad_transmits(link);
2485 if (r < 0)
2486 return r;
2487
2488 r = link_set_ipv6_hop_limit(link);
2489 if (r < 0)
2490 return r;
2491
2492 r = link_set_flags(link);
2493 if (r < 0)
2494 return r;
2495
2496 r = link_set_ipv6_mtu(link);
2497 if (r < 0)
2498 return r;
2499
2500 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
2501 r = ipv4ll_configure(link);
2502 if (r < 0)
2503 return r;
2504 }
2505
2506 if (link_dhcp4_enabled(link)) {
2507 r = dhcp4_set_promote_secondaries(link);
2508 if (r < 0)
2509 return r;
2510
2511 r = dhcp4_configure(link);
2512 if (r < 0)
2513 return r;
2514 }
2515
2516 if (link_dhcp4_server_enabled(link)) {
2517 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2518 if (r < 0)
2519 return r;
2520
2521 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2522 if (r < 0)
2523 return r;
2524 }
2525
2526 if (link_dhcp6_enabled(link) ||
2527 link_ipv6_accept_ra_enabled(link)) {
2528 r = dhcp6_configure(link);
2529 if (r < 0)
2530 return r;
2531 }
2532
2533 if (link_ipv6_accept_ra_enabled(link)) {
2534 r = ndisc_configure(link);
2535 if (r < 0)
2536 return r;
2537 }
2538
2539 if (link_radv_enabled(link)) {
2540 r = radv_configure(link);
2541 if (r < 0)
2542 return r;
2543 }
2544
2545 if (link_lldp_rx_enabled(link)) {
2546 r = link_lldp_rx_configure(link);
2547 if (r < 0)
2548 return r;
2549 }
2550
2551 r = link_configure_mtu(link);
2552 if (r < 0)
2553 return r;
2554
2555 r = link_configure_addrgen_mode(link);
2556 if (r < 0)
2557 return r;
2558
2559 return link_configure_after_setting_mtu(link);
2560 }
2561
2562 static int link_configure_after_setting_mtu(Link *link) {
2563 int r;
2564
2565 assert(link);
2566 assert(link->network);
2567 assert(link->state == LINK_STATE_INITIALIZED);
2568
2569 if (link->setting_mtu)
2570 return 0;
2571
2572 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2573 r = link_acquire_conf(link);
2574 if (r < 0)
2575 return r;
2576 }
2577
2578 return link_enter_join_netdev(link);
2579 }
2580
2581 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
2582 assert(duid);
2583
2584 if (duid->raw_data_len > 0)
2585 return 0;
2586
2587 if (duid->type != DUID_TYPE_UUID)
2588 return -EINVAL;
2589
2590 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
2591 duid->raw_data_len = sizeof(sd_id128_t);
2592
2593 return 1;
2594 }
2595
2596 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
2597 Manager *manager = userdata;
2598 const sd_bus_error *e;
2599 const void *a;
2600 size_t sz;
2601 DUID *duid;
2602 Link *link;
2603 int r;
2604
2605 assert(m);
2606 assert(manager);
2607
2608 e = sd_bus_message_get_error(m);
2609 if (e) {
2610 log_error_errno(sd_bus_error_get_errno(e),
2611 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
2612 e->message);
2613 goto configure;
2614 }
2615
2616 r = sd_bus_message_read_array(m, 'y', &a, &sz);
2617 if (r < 0)
2618 goto configure;
2619
2620 if (sz != sizeof(sd_id128_t)) {
2621 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
2622 goto configure;
2623 }
2624
2625 memcpy(&manager->product_uuid, a, sz);
2626 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
2627 (void) duid_set_uuid(duid, manager->product_uuid);
2628
2629 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
2630
2631 configure:
2632 while ((link = set_steal_first(manager->links_requesting_uuid))) {
2633 r = link_configure(link);
2634 if (r < 0)
2635 log_link_error_errno(link, r, "Failed to configure link: %m");
2636 }
2637
2638 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
2639
2640 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
2641 * even if the method fails. */
2642 manager->has_product_uuid = true;
2643
2644 return 1;
2645 }
2646
2647 static bool link_requires_uuid(Link *link) {
2648 const DUID *duid;
2649
2650 assert(link);
2651 assert(link->manager);
2652 assert(link->network);
2653
2654 duid = link_get_duid(link);
2655 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
2656 return false;
2657
2658 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
2659 return true;
2660
2661 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
2662 return true;
2663
2664 return false;
2665 }
2666
2667 static int link_configure_duid(Link *link) {
2668 Manager *m;
2669 DUID *duid;
2670 int r;
2671
2672 assert(link);
2673 assert(link->manager);
2674 assert(link->network);
2675
2676 m = link->manager;
2677 duid = link_get_duid(link);
2678
2679 if (!link_requires_uuid(link))
2680 return 1;
2681
2682 if (m->has_product_uuid) {
2683 (void) duid_set_uuid(duid, m->product_uuid);
2684 return 1;
2685 }
2686
2687 if (!m->links_requesting_uuid) {
2688 r = manager_request_product_uuid(m, link);
2689 if (r < 0) {
2690 if (r == -ENOMEM)
2691 return r;
2692
2693 log_link_warning_errno(link, r,
2694 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
2695 return 1;
2696 }
2697 } else {
2698 r = set_put(m->links_requesting_uuid, link);
2699 if (r < 0)
2700 return log_oom();
2701
2702 r = set_put(m->duids_requesting_uuid, duid);
2703 if (r < 0)
2704 return log_oom();
2705 }
2706
2707 return 0;
2708 }
2709
2710 static int link_initialized_and_synced(Link *link) {
2711 Network *network;
2712 int r;
2713
2714 assert(link);
2715 assert(link->ifname);
2716 assert(link->manager);
2717
2718 /* We may get called either from the asynchronous netlink callback,
2719 * or directly for link_add() if running in a container. See link_add(). */
2720 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
2721 return 0;
2722
2723 log_link_debug(link, "Link state is up-to-date");
2724 link_set_state(link, LINK_STATE_INITIALIZED);
2725
2726 r = link_new_bound_by_list(link);
2727 if (r < 0)
2728 return r;
2729
2730 r = link_handle_bound_by_list(link);
2731 if (r < 0)
2732 return r;
2733
2734 if (!link->network) {
2735 r = network_get(link->manager, link->sd_device, link->ifname,
2736 &link->mac, &network);
2737 if (r == -ENOENT) {
2738 link_enter_unmanaged(link);
2739 return 0;
2740 } else if (r == 0 && network->unmanaged) {
2741 link_enter_unmanaged(link);
2742 return 0;
2743 } else if (r < 0)
2744 return r;
2745
2746 if (link->flags & IFF_LOOPBACK) {
2747 if (network->link_local != ADDRESS_FAMILY_NO)
2748 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2749
2750 if (network->dhcp != ADDRESS_FAMILY_NO)
2751 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2752
2753 if (network->dhcp_server)
2754 log_link_debug(link, "Ignoring DHCP server for loopback link");
2755 }
2756
2757 r = network_apply(network, link);
2758 if (r < 0)
2759 return r;
2760 }
2761
2762 r = link_new_bound_to_list(link);
2763 if (r < 0)
2764 return r;
2765
2766 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
2767 * link_configure() is called later asynchronously. */
2768 r = link_configure_duid(link);
2769 if (r <= 0)
2770 return r;
2771
2772 r = link_configure(link);
2773 if (r < 0)
2774 return r;
2775
2776 return 0;
2777 }
2778
2779 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2780 (void) link_initialized_and_synced(link);
2781 return 1;
2782 }
2783
2784 int link_initialized(Link *link, sd_device *device) {
2785 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2786 int r;
2787
2788 assert(link);
2789 assert(link->manager);
2790 assert(link->manager->rtnl);
2791 assert(device);
2792
2793 if (link->state != LINK_STATE_PENDING)
2794 return 0;
2795
2796 if (link->sd_device)
2797 return 0;
2798
2799 log_link_debug(link, "udev initialized link");
2800 link_set_state(link, LINK_STATE_INITIALIZED);
2801
2802 link->sd_device = sd_device_ref(device);
2803
2804 /* udev has initialized the link, but we don't know if we have yet
2805 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2806 * when it returns we know that the pending NEWLINKs have already been
2807 * processed and that we are up-to-date */
2808
2809 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2810 link->ifindex);
2811 if (r < 0)
2812 return r;
2813
2814 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
2815 link_netlink_destroy_callback, link);
2816 if (r < 0)
2817 return r;
2818
2819 link_ref(link);
2820
2821 return 0;
2822 }
2823
2824 static int link_load(Link *link) {
2825 _cleanup_free_ char *network_file = NULL,
2826 *addresses = NULL,
2827 *routes = NULL,
2828 *dhcp4_address = NULL,
2829 *ipv4ll_address = NULL;
2830 union in_addr_union address;
2831 union in_addr_union route_dst;
2832 const char *p;
2833 int r;
2834
2835 assert(link);
2836
2837 r = parse_env_file(NULL, link->state_file,
2838 "NETWORK_FILE", &network_file,
2839 "ADDRESSES", &addresses,
2840 "ROUTES", &routes,
2841 "DHCP4_ADDRESS", &dhcp4_address,
2842 "IPV4LL_ADDRESS", &ipv4ll_address);
2843 if (r < 0 && r != -ENOENT)
2844 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
2845
2846 if (network_file) {
2847 Network *network;
2848 char *suffix;
2849
2850 /* drop suffix */
2851 suffix = strrchr(network_file, '.');
2852 if (!suffix) {
2853 log_link_debug(link, "Failed to get network name from %s", network_file);
2854 goto network_file_fail;
2855 }
2856 *suffix = '\0';
2857
2858 r = network_get_by_name(link->manager, basename(network_file), &network);
2859 if (r < 0) {
2860 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
2861 goto network_file_fail;
2862 }
2863
2864 r = network_apply(network, link);
2865 if (r < 0)
2866 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
2867 }
2868
2869 network_file_fail:
2870
2871 if (addresses) {
2872 p = addresses;
2873
2874 for (;;) {
2875 _cleanup_free_ char *address_str = NULL;
2876 char *prefixlen_str;
2877 int family;
2878 unsigned char prefixlen;
2879
2880 r = extract_first_word(&p, &address_str, NULL, 0);
2881 if (r < 0) {
2882 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
2883 continue;
2884 }
2885 if (r == 0)
2886 break;
2887
2888 prefixlen_str = strchr(address_str, '/');
2889 if (!prefixlen_str) {
2890 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
2891 continue;
2892 }
2893
2894 *prefixlen_str++ = '\0';
2895
2896 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
2897 if (r != 1) {
2898 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
2899 continue;
2900 }
2901
2902 r = in_addr_from_string_auto(address_str, &family, &address);
2903 if (r < 0) {
2904 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
2905 continue;
2906 }
2907
2908 r = address_add(link, family, &address, prefixlen, NULL);
2909 if (r < 0)
2910 return log_link_error_errno(link, r, "Failed to add address: %m");
2911 }
2912 }
2913
2914 if (routes) {
2915 p = routes;
2916
2917 for (;;) {
2918 Route *route;
2919 _cleanup_free_ char *route_str = NULL;
2920 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
2921 usec_t lifetime;
2922 char *prefixlen_str;
2923 int family;
2924 unsigned char prefixlen, tos, table;
2925 uint32_t priority;
2926
2927 r = extract_first_word(&p, &route_str, NULL, 0);
2928 if (r < 0) {
2929 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
2930 continue;
2931 }
2932 if (r == 0)
2933 break;
2934
2935 prefixlen_str = strchr(route_str, '/');
2936 if (!prefixlen_str) {
2937 log_link_debug(link, "Failed to parse route %s", route_str);
2938 continue;
2939 }
2940
2941 *prefixlen_str++ = '\0';
2942
2943 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
2944 if (r != 5) {
2945 log_link_debug(link,
2946 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
2947 prefixlen_str);
2948 continue;
2949 }
2950
2951 r = in_addr_from_string_auto(route_str, &family, &route_dst);
2952 if (r < 0) {
2953 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
2954 continue;
2955 }
2956
2957 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
2958 if (r < 0)
2959 return log_link_error_errno(link, r, "Failed to add route: %m");
2960
2961 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
2962 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
2963 0, route_expire_handler, route);
2964 if (r < 0)
2965 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
2966 }
2967
2968 route->lifetime = lifetime;
2969 sd_event_source_unref(route->expire);
2970 route->expire = TAKE_PTR(expire);
2971 }
2972 }
2973
2974 if (dhcp4_address) {
2975 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
2976 if (r < 0) {
2977 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
2978 goto dhcp4_address_fail;
2979 }
2980
2981 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
2982 if (r < 0)
2983 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
2984
2985 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
2986 if (r < 0)
2987 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
2988 }
2989
2990 dhcp4_address_fail:
2991
2992 if (ipv4ll_address) {
2993 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
2994 if (r < 0) {
2995 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
2996 goto ipv4ll_address_fail;
2997 }
2998
2999 r = sd_ipv4ll_new(&link->ipv4ll);
3000 if (r < 0)
3001 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3002
3003 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3004 if (r < 0)
3005 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3006 }
3007
3008 ipv4ll_address_fail:
3009
3010 return 0;
3011 }
3012
3013 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3014 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3015 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3016 Link *link;
3017 int r;
3018
3019 assert(m);
3020 assert(m->rtnl);
3021 assert(message);
3022 assert(ret);
3023
3024 r = link_new(m, message, ret);
3025 if (r < 0)
3026 return r;
3027
3028 link = *ret;
3029
3030 log_link_debug(link, "Link %d added", link->ifindex);
3031
3032 r = link_load(link);
3033 if (r < 0)
3034 return r;
3035
3036 if (detect_container() <= 0) {
3037 /* not in a container, udev will be around */
3038 sprintf(ifindex_str, "n%d", link->ifindex);
3039 r = sd_device_new_from_device_id(&device, ifindex_str);
3040 if (r < 0) {
3041 log_link_warning_errno(link, r, "Could not find device: %m");
3042 goto failed;
3043 }
3044
3045 r = sd_device_get_is_initialized(device);
3046 if (r < 0) {
3047 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3048 goto failed;
3049 }
3050 if (r == 0) {
3051 /* not yet ready */
3052 log_link_debug(link, "link pending udev initialization...");
3053 return 0;
3054 }
3055
3056 r = device_is_renaming(device);
3057 if (r < 0) {
3058 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3059 goto failed;
3060 }
3061 if (r > 0) {
3062 log_link_debug(link, "Interface is under renaming, pending initialization.");
3063 return 0;
3064 }
3065
3066 r = link_initialized(link, device);
3067 if (r < 0)
3068 goto failed;
3069 } else {
3070 r = link_initialized_and_synced(link);
3071 if (r < 0)
3072 goto failed;
3073 }
3074
3075 return 0;
3076 failed:
3077 link_enter_failed(link);
3078 return r;
3079 }
3080
3081 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3082 int r;
3083
3084 assert(link);
3085
3086 log_link_info(link, "Gained IPv6LL");
3087
3088 link->ipv6ll_address = *address;
3089 link_check_ready(link);
3090
3091 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3092 r = link_acquire_ipv6_conf(link);
3093 if (r < 0) {
3094 link_enter_failed(link);
3095 return r;
3096 }
3097 }
3098
3099 return 0;
3100 }
3101
3102 static int link_carrier_gained(Link *link) {
3103 int r;
3104
3105 assert(link);
3106
3107 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3108 r = link_acquire_conf(link);
3109 if (r < 0) {
3110 link_enter_failed(link);
3111 return r;
3112 }
3113
3114 r = link_request_set_addresses(link);
3115 if (r < 0)
3116 return r;
3117 }
3118
3119 r = link_handle_bound_by_list(link);
3120 if (r < 0)
3121 return r;
3122
3123 return 0;
3124 }
3125
3126 static int link_carrier_lost(Link *link) {
3127 int r;
3128
3129 assert(link);
3130
3131 if (link->network && link->network->ignore_carrier_loss)
3132 return 0;
3133
3134 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3135 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3136 * configuration and stop the clients as well. */
3137 if (link->setting_mtu)
3138 return 0;
3139
3140 r = link_stop_clients(link, false);
3141 if (r < 0) {
3142 link_enter_failed(link);
3143 return r;
3144 }
3145
3146 if (link_dhcp4_server_enabled(link))
3147 (void) sd_dhcp_server_stop(link->dhcp_server);
3148
3149 r = link_drop_config(link);
3150 if (r < 0)
3151 return r;
3152
3153 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3154 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3155 r = link_drop_foreign_config(link);
3156 if (r < 0)
3157 return r;
3158 }
3159
3160 r = link_handle_bound_by_list(link);
3161 if (r < 0)
3162 return r;
3163
3164 return 0;
3165 }
3166
3167 int link_carrier_reset(Link *link) {
3168 int r;
3169
3170 assert(link);
3171
3172 if (link_has_carrier(link)) {
3173 r = link_carrier_lost(link);
3174 if (r < 0)
3175 return r;
3176
3177 r = link_carrier_gained(link);
3178 if (r < 0)
3179 return r;
3180
3181 log_link_info(link, "Reset carrier");
3182 }
3183
3184 return 0;
3185 }
3186
3187 int link_update(Link *link, sd_netlink_message *m) {
3188 struct ether_addr mac;
3189 const char *ifname;
3190 uint32_t mtu;
3191 bool had_carrier, carrier_gained, carrier_lost;
3192 int old_master, r;
3193
3194 assert(link);
3195 assert(link->ifname);
3196 assert(m);
3197
3198 if (link->state == LINK_STATE_LINGER) {
3199 log_link_info(link, "Link re-added");
3200 link_set_state(link, LINK_STATE_CONFIGURING);
3201
3202 r = link_new_carrier_maps(link);
3203 if (r < 0)
3204 return r;
3205 }
3206
3207 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3208 if (r >= 0 && !streq(ifname, link->ifname)) {
3209 Manager *manager = link->manager;
3210
3211 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3212
3213 link_drop(link);
3214 r = link_add(manager, m, &link);
3215 if (r < 0)
3216 return r;
3217 }
3218
3219 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3220 if (r >= 0 && mtu > 0) {
3221 link->mtu = mtu;
3222 if (link->original_mtu == 0) {
3223 link->original_mtu = mtu;
3224 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3225 }
3226
3227 if (link->dhcp_client) {
3228 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3229 link->mtu);
3230 if (r < 0)
3231 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3232 }
3233
3234 if (link->radv) {
3235 r = sd_radv_set_mtu(link->radv, link->mtu);
3236 if (r < 0)
3237 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3238 }
3239 }
3240
3241 /* The kernel may broadcast NEWLINK messages without the MAC address
3242 set, simply ignore them. */
3243 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3244 if (r >= 0) {
3245 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3246 ETH_ALEN)) {
3247
3248 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3249 ETH_ALEN);
3250
3251 log_link_debug(link, "MAC address: "
3252 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3253 mac.ether_addr_octet[0],
3254 mac.ether_addr_octet[1],
3255 mac.ether_addr_octet[2],
3256 mac.ether_addr_octet[3],
3257 mac.ether_addr_octet[4],
3258 mac.ether_addr_octet[5]);
3259
3260 if (link->ipv4ll) {
3261 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3262 if (r < 0)
3263 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3264 }
3265
3266 if (link->dhcp_client) {
3267 r = sd_dhcp_client_set_mac(link->dhcp_client,
3268 (const uint8_t *) &link->mac,
3269 sizeof (link->mac),
3270 ARPHRD_ETHER);
3271 if (r < 0)
3272 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3273
3274 r = dhcp4_set_client_identifier(link);
3275 if (r < 0)
3276 return r;
3277 }
3278
3279 if (link->dhcp6_client) {
3280 const DUID* duid = link_get_duid(link);
3281
3282 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3283 (const uint8_t *) &link->mac,
3284 sizeof (link->mac),
3285 ARPHRD_ETHER);
3286 if (r < 0)
3287 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3288
3289 if (link->network->iaid_set) {
3290 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3291 link->network->iaid);
3292 if (r < 0)
3293 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3294 }
3295
3296 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3297 duid->type,
3298 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3299 duid->raw_data_len);
3300 if (r < 0)
3301 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3302 }
3303
3304 if (link->radv) {
3305 r = sd_radv_set_mac(link->radv, &link->mac);
3306 if (r < 0)
3307 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3308 }
3309
3310 if (link->ndisc) {
3311 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3312 if (r < 0)
3313 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3314 }
3315 }
3316 }
3317
3318 old_master = link->master_ifindex;
3319 (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
3320
3321 had_carrier = link_has_carrier(link);
3322
3323 r = link_update_flags(link, m, old_master != link->master_ifindex);
3324 if (r < 0)
3325 return r;
3326
3327 r = link_update_lldp(link);
3328 if (r < 0)
3329 return r;
3330
3331 carrier_gained = !had_carrier && link_has_carrier(link);
3332 carrier_lost = had_carrier && !link_has_carrier(link);
3333
3334 if (carrier_gained) {
3335 log_link_info(link, "Gained carrier");
3336
3337 r = link_carrier_gained(link);
3338 if (r < 0)
3339 return r;
3340 } else if (carrier_lost) {
3341 log_link_info(link, "Lost carrier");
3342
3343 r = link_carrier_lost(link);
3344 if (r < 0)
3345 return r;
3346 }
3347
3348 return 0;
3349 }
3350
3351 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3352 bool space = false;
3353 Iterator i;
3354 Link *link;
3355
3356 assert(f);
3357 assert(prefix);
3358
3359 if (hashmap_isempty(h))
3360 return;
3361
3362 fputs(prefix, f);
3363 HASHMAP_FOREACH(link, h, i) {
3364 if (space)
3365 fputc(' ', f);
3366
3367 fprintf(f, "%i", link->ifindex);
3368 space = true;
3369 }
3370
3371 fputc('\n', f);
3372 }
3373
3374 int link_save(Link *link) {
3375 _cleanup_free_ char *temp_path = NULL;
3376 _cleanup_fclose_ FILE *f = NULL;
3377 const char *admin_state, *oper_state, *carrier_state, *address_state;
3378 Address *a;
3379 Route *route;
3380 Iterator i;
3381 int r;
3382
3383 assert(link);
3384 assert(link->state_file);
3385 assert(link->lease_file);
3386 assert(link->manager);
3387
3388 if (link->state == LINK_STATE_LINGER) {
3389 (void) unlink(link->state_file);
3390 return 0;
3391 }
3392
3393 link_lldp_save(link);
3394
3395 admin_state = link_state_to_string(link->state);
3396 assert(admin_state);
3397
3398 oper_state = link_operstate_to_string(link->operstate);
3399 assert(oper_state);
3400
3401 carrier_state = link_carrier_state_to_string(link->carrier_state);
3402 assert(carrier_state);
3403
3404 address_state = link_address_state_to_string(link->address_state);
3405 assert(address_state);
3406
3407 r = fopen_temporary(link->state_file, &f, &temp_path);
3408 if (r < 0)
3409 goto fail;
3410
3411 (void) fchmod(fileno(f), 0644);
3412
3413 fprintf(f,
3414 "# This is private data. Do not parse.\n"
3415 "ADMIN_STATE=%s\n"
3416 "OPER_STATE=%s\n"
3417 "CARRIER_STATE=%s\n"
3418 "ADDRESS_STATE=%s\n",
3419 admin_state, oper_state, carrier_state, address_state);
3420
3421 if (link->network) {
3422 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
3423 const char *dhcp_domainname = NULL, *p;
3424 sd_dhcp6_lease *dhcp6_lease = NULL;
3425 unsigned j;
3426 bool space;
3427
3428 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3429 yes_no(link->network->required_for_online));
3430
3431 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
3432 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
3433
3434 if (link->dhcp6_client) {
3435 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3436 if (r < 0 && r != -ENOMSG)
3437 log_link_debug(link, "No DHCPv6 lease");
3438 }
3439
3440 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3441
3442 fputs("DNS=", f);
3443 space = false;
3444
3445 for (j = 0; j < link->network->n_dns; j++) {
3446 _cleanup_free_ char *b = NULL;
3447
3448 r = in_addr_to_string(link->network->dns[j].family,
3449 &link->network->dns[j].address, &b);
3450 if (r < 0) {
3451 log_debug_errno(r, "Failed to format address, ignoring: %m");
3452 continue;
3453 }
3454
3455 if (space)
3456 fputc(' ', f);
3457 fputs(b, f);
3458 space = true;
3459 }
3460
3461 if (link->network->dhcp_use_dns &&
3462 link->dhcp_lease) {
3463 const struct in_addr *addresses;
3464
3465 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3466 if (r > 0)
3467 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3468 space = true;
3469 }
3470
3471 if (link->network->dhcp_use_dns && dhcp6_lease) {
3472 struct in6_addr *in6_addrs;
3473
3474 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3475 if (r > 0) {
3476 if (space)
3477 fputc(' ', f);
3478 serialize_in6_addrs(f, in6_addrs, r);
3479 space = true;
3480 }
3481 }
3482
3483 /* Make sure to flush out old entries before we use the NDISC data */
3484 ndisc_vacuum(link);
3485
3486 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3487 NDiscRDNSS *dd;
3488
3489 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3490 if (space)
3491 fputc(' ', f);
3492
3493 serialize_in6_addrs(f, &dd->address, 1);
3494 space = true;
3495 }
3496 }
3497
3498 fputc('\n', f);
3499
3500 fputs("NTP=", f);
3501 space = false;
3502 fputstrv(f, link->network->ntp, NULL, &space);
3503
3504 if (link->network->dhcp_use_ntp &&
3505 link->dhcp_lease) {
3506 const struct in_addr *addresses;
3507
3508 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3509 if (r > 0)
3510 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3511 space = true;
3512 }
3513
3514 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3515 struct in6_addr *in6_addrs;
3516 char **hosts;
3517
3518 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3519 &in6_addrs);
3520 if (r > 0) {
3521 if (space)
3522 fputc(' ', f);
3523 serialize_in6_addrs(f, in6_addrs, r);
3524 space = true;
3525 }
3526
3527 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3528 if (r > 0)
3529 fputstrv(f, hosts, NULL, &space);
3530 }
3531
3532 fputc('\n', f);
3533
3534 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3535 if (link->dhcp_lease) {
3536 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3537 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3538 }
3539 if (dhcp6_lease)
3540 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3541 }
3542
3543 fputs("DOMAINS=", f);
3544 space = false;
3545 ORDERED_SET_FOREACH(p, link->network->search_domains, i)
3546 fputs_with_space(f, p, NULL, &space);
3547
3548 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3549 NDiscDNSSL *dd;
3550
3551 if (dhcp_domainname)
3552 fputs_with_space(f, dhcp_domainname, NULL, &space);
3553 if (dhcp_domains)
3554 fputstrv(f, dhcp_domains, NULL, &space);
3555 if (dhcp6_domains)
3556 fputstrv(f, dhcp6_domains, NULL, &space);
3557
3558 SET_FOREACH(dd, link->ndisc_dnssl, i)
3559 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3560 }
3561
3562 fputc('\n', f);
3563
3564 fputs("ROUTE_DOMAINS=", f);
3565 space = false;
3566 ORDERED_SET_FOREACH(p, link->network->route_domains, i)
3567 fputs_with_space(f, p, NULL, &space);
3568
3569 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3570 NDiscDNSSL *dd;
3571
3572 if (dhcp_domainname)
3573 fputs_with_space(f, dhcp_domainname, NULL, &space);
3574 if (dhcp_domains)
3575 fputstrv(f, dhcp_domains, NULL, &space);
3576 if (dhcp6_domains)
3577 fputstrv(f, dhcp6_domains, NULL, &space);
3578
3579 SET_FOREACH(dd, link->ndisc_dnssl, i)
3580 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3581 }
3582
3583 fputc('\n', f);
3584
3585 fprintf(f, "LLMNR=%s\n",
3586 resolve_support_to_string(link->network->llmnr));
3587 fprintf(f, "MDNS=%s\n",
3588 resolve_support_to_string(link->network->mdns));
3589 if (link->network->dns_default_route >= 0)
3590 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
3591
3592 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3593 fprintf(f, "DNS_OVER_TLS=%s\n",
3594 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
3595
3596 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3597 fprintf(f, "DNSSEC=%s\n",
3598 dnssec_mode_to_string(link->network->dnssec_mode));
3599
3600 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3601 const char *n;
3602
3603 fputs("DNSSEC_NTA=", f);
3604 space = false;
3605 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3606 fputs_with_space(f, n, NULL, &space);
3607 fputc('\n', f);
3608 }
3609
3610 fputs("ADDRESSES=", f);
3611 space = false;
3612 SET_FOREACH(a, link->addresses, i) {
3613 _cleanup_free_ char *address_str = NULL;
3614
3615 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3616 if (r < 0)
3617 goto fail;
3618
3619 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3620 space = true;
3621 }
3622 fputc('\n', f);
3623
3624 fputs("ROUTES=", f);
3625 space = false;
3626 SET_FOREACH(route, link->routes, i) {
3627 _cleanup_free_ char *route_str = NULL;
3628
3629 r = in_addr_to_string(route->family, &route->dst, &route_str);
3630 if (r < 0)
3631 goto fail;
3632
3633 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
3634 space ? " " : "", route_str,
3635 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3636 space = true;
3637 }
3638
3639 fputc('\n', f);
3640 }
3641
3642 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3643 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3644
3645 if (link->dhcp_lease) {
3646 struct in_addr address;
3647 const char *tz = NULL;
3648
3649 assert(link->network);
3650
3651 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3652 if (r >= 0)
3653 fprintf(f, "TIMEZONE=%s\n", tz);
3654
3655 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3656 if (r >= 0) {
3657 fputs("DHCP4_ADDRESS=", f);
3658 serialize_in_addrs(f, &address, 1, false, NULL);
3659 fputc('\n', f);
3660 }
3661
3662 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3663 if (r < 0)
3664 goto fail;
3665
3666 fprintf(f,
3667 "DHCP_LEASE=%s\n",
3668 link->lease_file);
3669 } else
3670 (void) unlink(link->lease_file);
3671
3672 if (link->ipv4ll) {
3673 struct in_addr address;
3674
3675 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3676 if (r >= 0) {
3677 fputs("IPV4LL_ADDRESS=", f);
3678 serialize_in_addrs(f, &address, 1, false, NULL);
3679 fputc('\n', f);
3680 }
3681 }
3682
3683 r = fflush_and_check(f);
3684 if (r < 0)
3685 goto fail;
3686
3687 if (rename(temp_path, link->state_file) < 0) {
3688 r = -errno;
3689 goto fail;
3690 }
3691
3692 return 0;
3693
3694 fail:
3695 (void) unlink(link->state_file);
3696 if (temp_path)
3697 (void) unlink(temp_path);
3698
3699 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3700 }
3701
3702 /* The serialized state in /run is no longer up-to-date. */
3703 void link_dirty(Link *link) {
3704 int r;
3705
3706 assert(link);
3707
3708 /* mark manager dirty as link is dirty */
3709 manager_dirty(link->manager);
3710
3711 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3712 if (r < 0)
3713 /* allocation errors are ignored */
3714 return;
3715
3716 r = set_put(link->manager->dirty_links, link);
3717 if (r <= 0)
3718 /* don't take another ref if the link was already dirty */
3719 return;
3720
3721 link_ref(link);
3722 }
3723
3724 /* The serialized state in /run is up-to-date */
3725 void link_clean(Link *link) {
3726 assert(link);
3727 assert(link->manager);
3728
3729 link_unref(set_remove(link->manager->dirty_links, link));
3730 }
3731
3732 static const char* const link_state_table[_LINK_STATE_MAX] = {
3733 [LINK_STATE_PENDING] = "pending",
3734 [LINK_STATE_INITIALIZED] = "initialized",
3735 [LINK_STATE_CONFIGURING] = "configuring",
3736 [LINK_STATE_CONFIGURED] = "configured",
3737 [LINK_STATE_UNMANAGED] = "unmanaged",
3738 [LINK_STATE_FAILED] = "failed",
3739 [LINK_STATE_LINGER] = "linger",
3740 };
3741
3742 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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