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[thirdparty/systemd.git] / src / network / networkd-link.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <netinet/in.h>
4 #include <linux/if.h>
5 #include <linux/if_arp.h>
6 #include <linux/if_link.h>
7 #include <unistd.h>
8
9 #include "alloc-util.h"
10 #include "bond.h"
11 #include "bridge.h"
12 #include "bus-util.h"
13 #include "dhcp-identifier.h"
14 #include "dhcp-lease-internal.h"
15 #include "env-file.h"
16 #include "ethtool-util.h"
17 #include "fd-util.h"
18 #include "fileio.h"
19 #include "ipvlan.h"
20 #include "missing_network.h"
21 #include "netlink-util.h"
22 #include "network-internal.h"
23 #include "networkd-can.h"
24 #include "networkd-dhcp-server.h"
25 #include "networkd-dhcp4.h"
26 #include "networkd-dhcp6.h"
27 #include "networkd-ipv4ll.h"
28 #include "networkd-ipv6-proxy-ndp.h"
29 #include "networkd-link-bus.h"
30 #include "networkd-link.h"
31 #include "networkd-lldp-tx.h"
32 #include "networkd-manager.h"
33 #include "networkd-ndisc.h"
34 #include "networkd-neighbor.h"
35 #include "networkd-sriov.h"
36 #include "networkd-radv.h"
37 #include "networkd-routing-policy-rule.h"
38 #include "networkd-wifi.h"
39 #include "set.h"
40 #include "socket-util.h"
41 #include "stat-util.h"
42 #include "stdio-util.h"
43 #include "string-table.h"
44 #include "strv.h"
45 #include "sysctl-util.h"
46 #include "tc.h"
47 #include "tmpfile-util.h"
48 #include "udev-util.h"
49 #include "util.h"
50 #include "vrf.h"
51
52 uint32_t link_get_vrf_table(Link *link) {
53 return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
54 }
55
56 uint32_t link_get_dhcp_route_table(Link *link) {
57 /* When the interface is part of an VRF use the VRFs routing table, unless
58 * another table is explicitly specified. */
59 if (link->network->dhcp_route_table_set)
60 return link->network->dhcp_route_table;
61 return link_get_vrf_table(link);
62 }
63
64 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
65 if (link->network->ipv6_accept_ra_route_table_set)
66 return link->network->ipv6_accept_ra_route_table;
67 return link_get_vrf_table(link);
68 }
69
70 DUID* link_get_duid(Link *link) {
71 if (link->network->duid.type != _DUID_TYPE_INVALID)
72 return &link->network->duid;
73 else
74 return &link->manager->duid;
75 }
76
77 static bool link_dhcp6_enabled(Link *link) {
78 assert(link);
79
80 if (!socket_ipv6_is_supported())
81 return false;
82
83 if (link->flags & IFF_LOOPBACK)
84 return false;
85
86 if (!link->network)
87 return false;
88
89 if (link->network->bond)
90 return false;
91
92 if (link->iftype == ARPHRD_CAN)
93 return false;
94
95 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
96 }
97
98 static bool link_dhcp4_enabled(Link *link) {
99 assert(link);
100
101 if (link->flags & IFF_LOOPBACK)
102 return false;
103
104 if (!link->network)
105 return false;
106
107 if (link->network->bond)
108 return false;
109
110 if (link->iftype == ARPHRD_CAN)
111 return false;
112
113 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
114 }
115
116 static bool link_dhcp4_server_enabled(Link *link) {
117 assert(link);
118
119 if (link->flags & IFF_LOOPBACK)
120 return false;
121
122 if (!link->network)
123 return false;
124
125 if (link->network->bond)
126 return false;
127
128 if (link->iftype == ARPHRD_CAN)
129 return false;
130
131 return link->network->dhcp_server;
132 }
133
134 bool link_ipv4ll_enabled(Link *link, AddressFamily mask) {
135 assert(link);
136 assert((mask & ~(ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) == 0);
137
138 if (link->flags & IFF_LOOPBACK)
139 return false;
140
141 if (!link->network)
142 return false;
143
144 if (link->iftype == ARPHRD_CAN)
145 return false;
146
147 if (STRPTR_IN_SET(link->kind,
148 "vrf", "wireguard", "ipip", "gre", "ip6gre","ip6tnl", "sit", "vti",
149 "vti6", "nlmon", "xfrm"))
150 return false;
151
152 /* L3 or L3S mode do not support ARP. */
153 if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S))
154 return false;
155
156 if (link->network->bond)
157 return false;
158
159 return link->network->link_local & mask;
160 }
161
162 static bool link_ipv6ll_enabled(Link *link) {
163 assert(link);
164
165 if (!socket_ipv6_is_supported())
166 return false;
167
168 if (link->flags & IFF_LOOPBACK)
169 return false;
170
171 if (!link->network)
172 return false;
173
174 if (link->iftype == ARPHRD_CAN)
175 return false;
176
177 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "sit", "vti", "nlmon"))
178 return false;
179
180 if (link->network->bond)
181 return false;
182
183 return link->network->link_local & ADDRESS_FAMILY_IPV6;
184 }
185
186 static bool link_ipv6_enabled(Link *link) {
187 assert(link);
188
189 if (!socket_ipv6_is_supported())
190 return false;
191
192 if (link->network->bond)
193 return false;
194
195 if (link->iftype == ARPHRD_CAN)
196 return false;
197
198 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
199 if (link_ipv6ll_enabled(link))
200 return true;
201
202 if (network_has_static_ipv6_configurations(link->network))
203 return true;
204
205 return false;
206 }
207
208 static bool link_radv_enabled(Link *link) {
209 assert(link);
210
211 if (!link_ipv6ll_enabled(link))
212 return false;
213
214 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
215 }
216
217 static bool link_ipv4_forward_enabled(Link *link) {
218 assert(link);
219
220 if (link->flags & IFF_LOOPBACK)
221 return false;
222
223 if (!link->network)
224 return false;
225
226 if (link->network->ip_forward == _ADDRESS_FAMILY_INVALID)
227 return false;
228
229 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
230 }
231
232 static bool link_ipv6_forward_enabled(Link *link) {
233 assert(link);
234
235 if (!socket_ipv6_is_supported())
236 return false;
237
238 if (link->flags & IFF_LOOPBACK)
239 return false;
240
241 if (!link->network)
242 return false;
243
244 if (link->network->ip_forward == _ADDRESS_FAMILY_INVALID)
245 return false;
246
247 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
248 }
249
250 static bool link_proxy_arp_enabled(Link *link) {
251 assert(link);
252
253 if (link->flags & IFF_LOOPBACK)
254 return false;
255
256 if (!link->network)
257 return false;
258
259 if (link->network->proxy_arp < 0)
260 return false;
261
262 return true;
263 }
264
265 static bool link_ipv6_accept_ra_enabled(Link *link) {
266 assert(link);
267
268 if (!socket_ipv6_is_supported())
269 return false;
270
271 if (link->flags & IFF_LOOPBACK)
272 return false;
273
274 if (!link->network)
275 return false;
276
277 if (!link_ipv6ll_enabled(link))
278 return false;
279
280 /* If unset use system default (enabled if local forwarding is disabled.
281 * disabled if local forwarding is enabled).
282 * If set, ignore or enforce RA independent of local forwarding state.
283 */
284 if (link->network->ipv6_accept_ra < 0)
285 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
286 return !link_ipv6_forward_enabled(link);
287 else if (link->network->ipv6_accept_ra > 0)
288 /* accept RA even if ip_forward is enabled */
289 return true;
290 else
291 /* ignore RA */
292 return false;
293 }
294
295 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
296 assert(link);
297
298 if (!socket_ipv6_is_supported())
299 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
300
301 if (link->flags & IFF_LOOPBACK)
302 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
303
304 if (!link->network)
305 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
306
307 return link->network->ipv6_privacy_extensions;
308 }
309
310 static int link_update_ipv6_sysctl(Link *link) {
311 bool enabled;
312 int r;
313
314 if (link->flags & IFF_LOOPBACK)
315 return 0;
316
317 enabled = link_ipv6_enabled(link);
318 if (enabled) {
319 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", false);
320 if (r < 0)
321 return log_link_warning_errno(link, r, "Cannot enable IPv6: %m");
322
323 log_link_info(link, "IPv6 successfully enabled");
324 }
325
326 return 0;
327 }
328
329 static bool link_is_enslaved(Link *link) {
330 if (link->flags & IFF_SLAVE)
331 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
332 return true;
333
334 if (!link->network)
335 return false;
336
337 if (link->master_ifindex > 0 && link->network->bridge)
338 return true;
339
340 /* TODO: add conditions for other netdevs. */
341
342 return false;
343 }
344
345 static void link_update_master_operstate(Link *link, NetDev *netdev) {
346 Link *master;
347
348 if (!netdev)
349 return;
350
351 if (netdev->ifindex <= 0)
352 return;
353
354 if (link_get(link->manager, netdev->ifindex, &master) < 0)
355 return;
356
357 link_update_operstate(master, true);
358 }
359
360 void link_update_operstate(Link *link, bool also_update_master) {
361 LinkOperationalState operstate;
362 LinkCarrierState carrier_state;
363 LinkAddressState address_state;
364 _cleanup_strv_free_ char **p = NULL;
365 uint8_t scope = RT_SCOPE_NOWHERE;
366 bool changed = false;
367 Address *address;
368 Iterator i;
369
370 assert(link);
371
372 if (link->kernel_operstate == IF_OPER_DORMANT)
373 carrier_state = LINK_CARRIER_STATE_DORMANT;
374 else if (link_has_carrier(link)) {
375 if (link_is_enslaved(link))
376 carrier_state = LINK_CARRIER_STATE_ENSLAVED;
377 else
378 carrier_state = LINK_CARRIER_STATE_CARRIER;
379 } else if (link->flags & IFF_UP)
380 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
381 else
382 carrier_state = LINK_CARRIER_STATE_OFF;
383
384 if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
385 Link *slave;
386
387 SET_FOREACH(slave, link->slaves, i) {
388 link_update_operstate(slave, false);
389
390 if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
391 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
392 }
393 }
394
395 SET_FOREACH(address, link->addresses, i) {
396 if (!address_is_ready(address))
397 continue;
398
399 if (address->scope < scope)
400 scope = address->scope;
401 }
402
403 /* for operstate we also take foreign addresses into account */
404 SET_FOREACH(address, link->addresses_foreign, i) {
405 if (!address_is_ready(address))
406 continue;
407
408 if (address->scope < scope)
409 scope = address->scope;
410 }
411
412 if (scope < RT_SCOPE_SITE)
413 /* universally accessible addresses found */
414 address_state = LINK_ADDRESS_STATE_ROUTABLE;
415 else if (scope < RT_SCOPE_HOST)
416 /* only link or site local addresses found */
417 address_state = LINK_ADDRESS_STATE_DEGRADED;
418 else
419 /* no useful addresses found */
420 address_state = LINK_ADDRESS_STATE_OFF;
421
422 /* Mapping of address and carrier state vs operational state
423 * carrier state
424 * | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
425 * ------------------------------------------------------------------------------
426 * off | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
427 * address_state degraded | off | no-carrier | dormant | degraded-carrier | degraded | enslaved
428 * routable | off | no-carrier | dormant | degraded-carrier | routable | routable
429 */
430
431 if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
432 operstate = (LinkOperationalState) carrier_state;
433 else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
434 operstate = LINK_OPERSTATE_ROUTABLE;
435 else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
436 operstate = LINK_OPERSTATE_DEGRADED;
437 else
438 operstate = LINK_OPERSTATE_ENSLAVED;
439
440 if (link->carrier_state != carrier_state) {
441 link->carrier_state = carrier_state;
442 changed = true;
443 if (strv_extend(&p, "CarrierState") < 0)
444 log_oom();
445 }
446
447 if (link->address_state != address_state) {
448 link->address_state = address_state;
449 changed = true;
450 if (strv_extend(&p, "AddressState") < 0)
451 log_oom();
452 }
453
454 if (link->operstate != operstate) {
455 link->operstate = operstate;
456 changed = true;
457 if (strv_extend(&p, "OperationalState") < 0)
458 log_oom();
459 }
460
461 if (p)
462 link_send_changed_strv(link, p);
463 if (changed)
464 link_dirty(link);
465
466 if (also_update_master && link->network) {
467 link_update_master_operstate(link, link->network->bond);
468 link_update_master_operstate(link, link->network->bridge);
469 }
470 }
471
472 #define FLAG_STRING(string, flag, old, new) \
473 (((old ^ new) & flag) \
474 ? ((old & flag) ? (" -" string) : (" +" string)) \
475 : "")
476
477 static int link_update_flags(Link *link, sd_netlink_message *m, bool force_update_operstate) {
478 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
479 uint8_t operstate;
480 int r;
481
482 assert(link);
483
484 r = sd_rtnl_message_link_get_flags(m, &flags);
485 if (r < 0)
486 return log_link_warning_errno(link, r, "Could not get link flags: %m");
487
488 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
489 if (r < 0)
490 /* if we got a message without operstate, take it to mean
491 the state was unchanged */
492 operstate = link->kernel_operstate;
493
494 if (!force_update_operstate && (link->flags == flags) && (link->kernel_operstate == operstate))
495 return 0;
496
497 if (link->flags != flags) {
498 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",
499 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
500 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
501 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
502 FLAG_STRING("UP", IFF_UP, link->flags, flags),
503 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
504 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
505 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
506 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
507 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
508 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
509 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
510 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
511 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
512 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
513 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
514 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
515 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
516 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
517 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
518
519 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
520 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
521 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
522 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
523 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
524 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
525 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
526 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
527
528 /* link flags are currently at most 18 bits, let's align to
529 * printing 20 */
530 if (unknown_flags_added)
531 log_link_debug(link,
532 "Unknown link flags gained: %#.5x (ignoring)",
533 unknown_flags_added);
534
535 if (unknown_flags_removed)
536 log_link_debug(link,
537 "Unknown link flags lost: %#.5x (ignoring)",
538 unknown_flags_removed);
539 }
540
541 link->flags = flags;
542 link->kernel_operstate = operstate;
543
544 link_update_operstate(link, true);
545
546 return 0;
547 }
548
549 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
550 _cleanup_(link_unrefp) Link *link = NULL;
551 const char *ifname, *kind = NULL;
552 unsigned short iftype;
553 int r, ifindex;
554 uint16_t type;
555
556 assert(manager);
557 assert(message);
558 assert(ret);
559
560 /* check for link kind */
561 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
562 if (r == 0) {
563 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
564 r = sd_netlink_message_exit_container(message);
565 if (r < 0)
566 return r;
567 }
568
569 r = sd_netlink_message_get_type(message, &type);
570 if (r < 0)
571 return r;
572 else if (type != RTM_NEWLINK)
573 return -EINVAL;
574
575 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
576 if (r < 0)
577 return r;
578 else if (ifindex <= 0)
579 return -EINVAL;
580
581 r = sd_rtnl_message_link_get_type(message, &iftype);
582 if (r < 0)
583 return r;
584
585 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
586 if (r < 0)
587 return r;
588
589 link = new(Link, 1);
590 if (!link)
591 return -ENOMEM;
592
593 *link = (Link) {
594 .n_ref = 1,
595 .manager = manager,
596 .state = LINK_STATE_PENDING,
597 .ifindex = ifindex,
598 .iftype = iftype,
599
600 .n_dns = (unsigned) -1,
601 .dns_default_route = -1,
602 .llmnr = _RESOLVE_SUPPORT_INVALID,
603 .mdns = _RESOLVE_SUPPORT_INVALID,
604 .dnssec_mode = _DNSSEC_MODE_INVALID,
605 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
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 r = ethtool_get_permanent_macaddr(&manager->ethtool_fd, link->ifname, &link->permanent_mac);
627 if (r < 0)
628 log_link_debug_errno(link, r, "Permanent MAC address not found for new device, continuing without: %m");
629
630 r = ethtool_get_driver(&manager->ethtool_fd, link->ifname, &link->driver);
631 if (r < 0)
632 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
633
634 r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &link->alternative_names);
635 if (r < 0 && r != -ENODATA)
636 return r;
637
638 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
639 return -ENOMEM;
640
641 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
642 return -ENOMEM;
643
644 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
645 return -ENOMEM;
646
647 r = hashmap_ensure_allocated(&manager->links, NULL);
648 if (r < 0)
649 return r;
650
651 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
652 if (r < 0)
653 return r;
654
655 r = link_update_flags(link, message, false);
656 if (r < 0)
657 return r;
658
659 *ret = TAKE_PTR(link);
660
661 return 0;
662 }
663
664 void link_ntp_settings_clear(Link *link) {
665 link->ntp = strv_free(link->ntp);
666 }
667
668 void link_dns_settings_clear(Link *link) {
669 link->dns = mfree(link->dns);
670 link->n_dns = (unsigned) -1;
671
672 link->search_domains = ordered_set_free_free(link->search_domains);
673 link->route_domains = ordered_set_free_free(link->route_domains);
674
675 link->dns_default_route = -1;
676 link->llmnr = _RESOLVE_SUPPORT_INVALID;
677 link->mdns = _RESOLVE_SUPPORT_INVALID;
678 link->dnssec_mode = _DNSSEC_MODE_INVALID;
679 link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
680
681 link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
682 }
683
684 static void link_free_engines(Link *link) {
685 if (!link)
686 return;
687
688 link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
689 link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client);
690 link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
691 link->dhcp_routes = set_free(link->dhcp_routes);
692
693 link->lldp = sd_lldp_unref(link->lldp);
694
695 ndisc_flush(link);
696
697 link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
698 link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
699 link->ndisc = sd_ndisc_unref(link->ndisc);
700 link->radv = sd_radv_unref(link->radv);
701 }
702
703 static Link *link_free(Link *link) {
704 Address *address;
705
706 assert(link);
707
708 link_ntp_settings_clear(link);
709 link_dns_settings_clear(link);
710
711 link->routes = set_free_with_destructor(link->routes, route_free);
712 link->routes_foreign = set_free_with_destructor(link->routes_foreign, route_free);
713
714 link->nexthops = set_free_with_destructor(link->nexthops, nexthop_free);
715 link->nexthops_foreign = set_free_with_destructor(link->nexthops_foreign, nexthop_free);
716
717 link->neighbors = set_free_with_destructor(link->neighbors, neighbor_free);
718 link->neighbors_foreign = set_free_with_destructor(link->neighbors_foreign, neighbor_free);
719
720 link->addresses = set_free_with_destructor(link->addresses, address_free);
721 link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free);
722
723 while ((address = link->pool_addresses)) {
724 LIST_REMOVE(addresses, link->pool_addresses, address);
725 address_free(address);
726 }
727
728 link_lldp_emit_stop(link);
729 link_free_engines(link);
730 free(link->lease_file);
731 free(link->lldp_file);
732
733 free(link->ifname);
734 strv_free(link->alternative_names);
735 free(link->kind);
736 free(link->ssid);
737 free(link->driver);
738
739 (void) unlink(link->state_file);
740 free(link->state_file);
741
742 sd_device_unref(link->sd_device);
743
744 hashmap_free(link->bound_to_links);
745 hashmap_free(link->bound_by_links);
746
747 set_free_with_destructor(link->slaves, link_unref);
748
749 network_unref(link->network);
750
751 return mfree(link);
752 }
753
754 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
755
756 int link_get(Manager *m, int ifindex, Link **ret) {
757 Link *link;
758
759 assert(m);
760 assert(ifindex > 0);
761 assert(ret);
762
763 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
764 if (!link)
765 return -ENODEV;
766
767 *ret = link;
768
769 return 0;
770 }
771
772 void link_set_state(Link *link, LinkState state) {
773 assert(link);
774
775 if (link->state == state)
776 return;
777
778 log_link_debug(link, "State changed: %s -> %s",
779 link_state_to_string(link->state),
780 link_state_to_string(state));
781
782 link->state = state;
783
784 link_send_changed(link, "AdministrativeState", NULL);
785 }
786
787 static void link_enter_unmanaged(Link *link) {
788 assert(link);
789
790 link_set_state(link, LINK_STATE_UNMANAGED);
791
792 link_dirty(link);
793 }
794
795 int link_stop_clients(Link *link, bool may_keep_dhcp) {
796 int r = 0, k;
797 Address *ad;
798
799 assert(link);
800 assert(link->manager);
801 assert(link->manager->event);
802
803 dhcp4_release_old_lease(link);
804
805 bool keep_dhcp = may_keep_dhcp &&
806 link->network &&
807 (link->manager->restarting ||
808 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
809
810 if (link->dhcp_client && !keep_dhcp) {
811 k = sd_dhcp_client_stop(link->dhcp_client);
812 if (k < 0)
813 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
814 }
815
816 if (link->ipv4ll) {
817 k = sd_ipv4ll_stop(link->ipv4ll);
818 if (k < 0)
819 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
820 }
821
822 if (link->network)
823 LIST_FOREACH(addresses, ad, link->network->static_addresses)
824 if (ad->acd && sd_ipv4acd_is_running(ad->acd) == 0) {
825 k = sd_ipv4acd_stop(ad->acd);
826 if (k < 0)
827 r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client: %m");
828 }
829
830 if (link->dhcp6_client) {
831 k = sd_dhcp6_client_stop(link->dhcp6_client);
832 if (k < 0)
833 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
834 }
835
836 if (link->ndisc) {
837 k = sd_ndisc_stop(link->ndisc);
838 if (k < 0)
839 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
840 }
841
842 if (link->radv) {
843 k = sd_radv_stop(link->radv);
844 if (k < 0)
845 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
846 }
847
848 link_lldp_emit_stop(link);
849 return r;
850 }
851
852 void link_enter_failed(Link *link) {
853 assert(link);
854
855 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
856 return;
857
858 log_link_warning(link, "Failed");
859
860 link_set_state(link, LINK_STATE_FAILED);
861
862 link_stop_clients(link, false);
863
864 link_dirty(link);
865 }
866
867 static int link_join_netdevs_after_configured(Link *link) {
868 NetDev *netdev;
869 Iterator i;
870 int r;
871
872 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
873 if (netdev->ifindex > 0)
874 /* Assume already enslaved. */
875 continue;
876
877 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
878 continue;
879
880 log_struct(LOG_DEBUG,
881 LOG_LINK_INTERFACE(link),
882 LOG_NETDEV_INTERFACE(netdev),
883 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
884
885 r = netdev_join(netdev, link, NULL);
886 if (r < 0)
887 return log_struct_errno(LOG_WARNING, r,
888 LOG_LINK_INTERFACE(link),
889 LOG_NETDEV_INTERFACE(netdev),
890 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
891 }
892
893 return 0;
894 }
895
896 static void link_enter_configured(Link *link) {
897 assert(link);
898 assert(link->network);
899
900 if (link->state != LINK_STATE_CONFIGURING)
901 return;
902
903 link_set_state(link, LINK_STATE_CONFIGURED);
904
905 (void) link_join_netdevs_after_configured(link);
906
907 link_dirty(link);
908 }
909
910 static int link_request_set_routing_policy_rule(Link *link) {
911 RoutingPolicyRule *rule, *rrule = NULL;
912 int r;
913
914 assert(link);
915 assert(link->network);
916
917 link->routing_policy_rules_configured = false;
918
919 LIST_FOREACH(rules, rule, link->network->rules) {
920 r = routing_policy_rule_get(link->manager, rule, &rrule);
921 if (r >= 0) {
922 if (r == 0)
923 (void) routing_policy_rule_make_local(link->manager, rrule);
924 continue;
925 }
926
927 r = routing_policy_rule_configure(rule, link, NULL);
928 if (r < 0)
929 return log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
930 if (r > 0)
931 link->routing_policy_rule_messages++;
932 }
933
934 routing_policy_rule_purge(link->manager, link);
935 if (link->routing_policy_rule_messages == 0) {
936 link->routing_policy_rules_configured = true;
937 link_check_ready(link);
938 } else {
939 log_link_debug(link, "Setting routing policy rules");
940 link_set_state(link, LINK_STATE_CONFIGURING);
941 }
942
943 return 0;
944 }
945
946 static int nexthop_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
947 int r;
948
949 assert(link);
950 assert(link->nexthop_messages > 0);
951 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
952 LINK_STATE_FAILED, LINK_STATE_LINGER));
953
954 link->nexthop_messages--;
955
956 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
957 return 1;
958
959 r = sd_netlink_message_get_errno(m);
960 if (r < 0 && r != -EEXIST) {
961 log_link_message_warning_errno(link, m, r, "Could not set nexthop");
962 link_enter_failed(link);
963 return 1;
964 }
965
966 if (link->nexthop_messages == 0) {
967 log_link_debug(link, "Nexthop set");
968 link->static_nexthops_configured = true;
969 link_check_ready(link);
970 }
971
972 return 1;
973 }
974
975 int link_request_set_nexthop(Link *link) {
976 NextHop *nh;
977 int r;
978
979 LIST_FOREACH(nexthops, nh, link->network->static_nexthops) {
980 r = nexthop_configure(nh, link, nexthop_handler);
981 if (r < 0)
982 return log_link_warning_errno(link, r, "Could not set nexthop: %m");
983 if (r > 0)
984 link->nexthop_messages++;
985 }
986
987 if (link->nexthop_messages == 0) {
988 link->static_nexthops_configured = true;
989 link_check_ready(link);
990 } else {
991 log_link_debug(link, "Setting nexthop");
992 link_set_state(link, LINK_STATE_CONFIGURING);
993 }
994
995 return 1;
996 }
997
998 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
999 int r;
1000
1001 assert(link);
1002 assert(link->route_messages > 0);
1003 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1004 LINK_STATE_FAILED, LINK_STATE_LINGER));
1005
1006 link->route_messages--;
1007
1008 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1009 return 1;
1010
1011 r = sd_netlink_message_get_errno(m);
1012 if (r < 0 && r != -EEXIST) {
1013 log_link_message_warning_errno(link, m, r, "Could not set route");
1014 link_enter_failed(link);
1015 return 1;
1016 }
1017
1018 if (link->route_messages == 0) {
1019 log_link_debug(link, "Routes set");
1020 link->static_routes_configured = true;
1021 link_check_ready(link);
1022 }
1023
1024 return 1;
1025 }
1026
1027 int link_request_set_routes(Link *link) {
1028 enum {
1029 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
1030 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
1031 _PHASE_MAX
1032 } phase;
1033 Route *rt;
1034 int r;
1035
1036 assert(link);
1037 assert(link->network);
1038 assert(link->addresses_configured);
1039 assert(link->address_messages == 0);
1040 assert(link->state != _LINK_STATE_INVALID);
1041
1042 link->static_routes_configured = false;
1043 link->static_routes_ready = false;
1044
1045 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
1046 /* During configuring addresses, the link lost its carrier. As networkd is dropping
1047 * the addresses now, let's not configure the routes either. */
1048 return 0;
1049
1050 r = link_request_set_routing_policy_rule(link);
1051 if (r < 0)
1052 return r;
1053
1054 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
1055 for (phase = 0; phase < _PHASE_MAX; phase++)
1056 LIST_FOREACH(routes, rt, link->network->static_routes) {
1057 if (rt->gateway_from_dhcp)
1058 continue;
1059
1060 if ((in_addr_is_null(rt->family, &rt->gw) && ordered_set_isempty(rt->multipath_routes)) != (phase == PHASE_NON_GATEWAY))
1061 continue;
1062
1063 r = route_configure(rt, link, route_handler);
1064 if (r < 0)
1065 return log_link_warning_errno(link, r, "Could not set routes: %m");
1066 if (r > 0)
1067 link->route_messages++;
1068 }
1069
1070 if (link->route_messages == 0) {
1071 link->static_routes_configured = true;
1072 link_check_ready(link);
1073 } else {
1074 log_link_debug(link, "Setting routes");
1075 link_set_state(link, LINK_STATE_CONFIGURING);
1076 }
1077
1078 return 0;
1079 }
1080
1081 void link_check_ready(Link *link) {
1082 Address *a;
1083 Iterator i;
1084 int r;
1085
1086 assert(link);
1087
1088 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1089 return;
1090
1091 if (!link->network)
1092 return;
1093
1094 if (!link->addresses_configured)
1095 return;
1096
1097 if (!link->neighbors_configured)
1098 return;
1099
1100 SET_FOREACH(a, link->addresses, i)
1101 if (!address_is_ready(a))
1102 return;
1103
1104 if (!link->addresses_ready) {
1105 link->addresses_ready = true;
1106 r = link_request_set_routes(link);
1107 if (r < 0)
1108 link_enter_failed(link);
1109 return;
1110 }
1111
1112 if (!link->static_routes_configured)
1113 return;
1114
1115 if (!link->static_routes_ready) {
1116 link->static_routes_ready = true;
1117 r = link_request_set_nexthop(link);
1118 if (r < 0)
1119 link_enter_failed(link);
1120 return;
1121 }
1122
1123 if (!link->static_nexthops_configured)
1124 return;
1125
1126 if (!link->routing_policy_rules_configured)
1127 return;
1128
1129 if (!link->tc_configured)
1130 return;
1131
1132 if (!link->sr_iov_configured)
1133 return;
1134
1135 if (link_has_carrier(link) || !link->network->configure_without_carrier) {
1136
1137 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !link->ipv4ll_address)
1138 return;
1139
1140 if (link_ipv6ll_enabled(link) &&
1141 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
1142 return;
1143
1144 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link)) &&
1145 !link->dhcp4_configured &&
1146 !link->dhcp6_configured &&
1147 !link->ndisc_configured &&
1148 !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address))
1149 /* When DHCP or RA is enabled, at least one protocol must provide an address, or
1150 * an IPv4ll fallback address must be configured. */
1151 return;
1152 }
1153
1154 if (link->state != LINK_STATE_CONFIGURED)
1155 link_enter_configured(link);
1156
1157 return;
1158 }
1159
1160 static int link_request_set_neighbors(Link *link) {
1161 Neighbor *neighbor;
1162 int r;
1163
1164 assert(link);
1165 assert(link->network);
1166 assert(link->state != _LINK_STATE_INVALID);
1167
1168 link->neighbors_configured = false;
1169
1170 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1171 r = neighbor_configure(neighbor, link, NULL);
1172 if (r < 0)
1173 return log_link_warning_errno(link, r, "Could not set neighbor: %m");
1174 }
1175
1176 if (link->neighbor_messages == 0) {
1177 link->neighbors_configured = true;
1178 link_check_ready(link);
1179 } else {
1180 log_link_debug(link, "Setting neighbors");
1181 link_set_state(link, LINK_STATE_CONFIGURING);
1182 }
1183
1184 return 0;
1185 }
1186
1187 int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1188 int r;
1189
1190 assert(rtnl);
1191 assert(m);
1192 assert(link);
1193 assert(link->ifname);
1194 assert(link->address_messages > 0);
1195 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1196 LINK_STATE_FAILED, LINK_STATE_LINGER));
1197
1198 link->address_messages--;
1199
1200 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1201 return 1;
1202
1203 r = sd_netlink_message_get_errno(m);
1204 if (r < 0 && r != -EEXIST) {
1205 log_link_message_warning_errno(link, m, r, "Could not set address");
1206 link_enter_failed(link);
1207 return 1;
1208 } else if (r >= 0)
1209 (void) manager_rtnl_process_address(rtnl, m, link->manager);
1210
1211 if (link->address_messages == 0) {
1212 log_link_debug(link, "Addresses set");
1213 link->addresses_configured = true;
1214 link_check_ready(link);
1215 }
1216
1217 return 1;
1218 }
1219
1220 static int link_set_bridge_fdb(Link *link) {
1221 FdbEntry *fdb_entry;
1222 int r;
1223
1224 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1225 r = fdb_entry_configure(link, fdb_entry);
1226 if (r < 0)
1227 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1228 }
1229
1230 return 0;
1231 }
1232
1233 static int link_request_set_addresses(Link *link) {
1234 AddressLabel *label;
1235 Address *ad;
1236 Prefix *p;
1237 int r;
1238
1239 assert(link);
1240 assert(link->network);
1241 assert(link->state != _LINK_STATE_INVALID);
1242
1243 /* Reset all *_configured flags we are configuring. */
1244 link->addresses_configured = false;
1245 link->addresses_ready = false;
1246 link->neighbors_configured = false;
1247 link->static_routes_configured = false;
1248 link->static_routes_ready = false;
1249 link->static_nexthops_configured = false;
1250 link->routing_policy_rules_configured = false;
1251
1252 r = link_set_bridge_fdb(link);
1253 if (r < 0)
1254 return r;
1255
1256 r = link_request_set_neighbors(link);
1257 if (r < 0)
1258 return r;
1259
1260 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1261 bool update;
1262
1263 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1264
1265 r = address_configure(ad, link, address_handler, update);
1266 if (r < 0)
1267 return log_link_warning_errno(link, r, "Could not set addresses: %m");
1268 if (r > 0)
1269 link->address_messages++;
1270 }
1271
1272 if (IN_SET(link->network->router_prefix_delegation,
1273 RADV_PREFIX_DELEGATION_STATIC,
1274 RADV_PREFIX_DELEGATION_BOTH))
1275 LIST_FOREACH(prefixes, p, link->network->static_prefixes) {
1276 _cleanup_(address_freep) Address *address = NULL;
1277
1278 if (!p->assign)
1279 continue;
1280
1281 r = address_new(&address);
1282 if (r < 0)
1283 return log_link_error_errno(link, r, "Could not allocate address: %m");
1284
1285 r = sd_radv_prefix_get_prefix(p->radv_prefix, &address->in_addr.in6, &address->prefixlen);
1286 if (r < 0)
1287 return r;
1288
1289 r = generate_ipv6_eui_64_address(link, &address->in_addr.in6);
1290 if (r < 0)
1291 return r;
1292
1293 address->family = AF_INET6;
1294 r = address_configure(address, link, address_handler, true);
1295 if (r < 0)
1296 return log_link_warning_errno(link, r, "Could not set addresses: %m");
1297 if (r > 0)
1298 link->address_messages++;
1299 }
1300
1301 LIST_FOREACH(labels, label, link->network->address_labels) {
1302 r = address_label_configure(label, link, NULL, false);
1303 if (r < 0)
1304 return log_link_warning_errno(link, r, "Could not set address label: %m");
1305
1306 link->address_label_messages++;
1307 }
1308
1309 /* now that we can figure out a default address for the dhcp server,
1310 start it */
1311 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1312 r = dhcp4_server_configure(link);
1313 if (r < 0)
1314 return r;
1315 log_link_debug(link, "Offering DHCPv4 leases");
1316 }
1317
1318 if (link->address_messages == 0) {
1319 link->addresses_configured = true;
1320 link_check_ready(link);
1321 } else {
1322 log_link_debug(link, "Setting addresses");
1323 link_set_state(link, LINK_STATE_CONFIGURING);
1324 }
1325
1326 return 0;
1327 }
1328
1329 static int link_set_bridge_vlan(Link *link) {
1330 int r;
1331
1332 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1333 if (r < 0)
1334 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1335
1336 return r;
1337 }
1338
1339 static int link_set_proxy_arp(Link *link) {
1340 int r;
1341
1342 if (!link_proxy_arp_enabled(link))
1343 return 0;
1344
1345 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1346 if (r < 0)
1347 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1348
1349 return 0;
1350 }
1351
1352 static int link_configure_continue(Link *link);
1353
1354 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1355 int r;
1356
1357 assert(m);
1358 assert(link);
1359 assert(link->ifname);
1360
1361 link->setting_mtu = false;
1362
1363 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1364 return 1;
1365
1366 r = sd_netlink_message_get_errno(m);
1367 if (r < 0)
1368 log_link_message_warning_errno(link, m, r, "Could not set MTU, ignoring");
1369 else
1370 log_link_debug(link, "Setting MTU done.");
1371
1372 if (link->state == LINK_STATE_INITIALIZED) {
1373 r = link_configure_continue(link);
1374 if (r < 0)
1375 link_enter_failed(link);
1376 }
1377
1378 return 1;
1379 }
1380
1381 int link_set_mtu(Link *link, uint32_t mtu) {
1382 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1383 int r;
1384
1385 assert(link);
1386 assert(link->manager);
1387 assert(link->manager->rtnl);
1388
1389 if (mtu == 0 || link->setting_mtu)
1390 return 0;
1391
1392 if (link->mtu == mtu)
1393 return 0;
1394
1395 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1396
1397 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1398 if (r < 0)
1399 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1400
1401 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1402 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1403 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1404
1405 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1406 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes");
1407
1408 mtu = IPV6_MIN_MTU;
1409 }
1410
1411 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1412 if (r < 0)
1413 return log_link_error_errno(link, r, "Could not append MTU: %m");
1414
1415 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1416 link_netlink_destroy_callback, link);
1417 if (r < 0)
1418 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1419
1420 link_ref(link);
1421 link->setting_mtu = true;
1422
1423 return 0;
1424 }
1425
1426 static bool link_reduces_vlan_mtu(Link *link) {
1427 /* See netif_reduces_vlan_mtu() in kernel. */
1428 return streq_ptr(link->kind, "macsec");
1429 }
1430
1431 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1432 uint32_t mtu = 0;
1433 NetDev *dev;
1434 Iterator i;
1435
1436 HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1437 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1438 /* See vlan_dev_change_mtu() in kernel. */
1439 mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1440
1441 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1442 /* See macvlan_change_mtu() in kernel. */
1443 mtu = dev->mtu;
1444
1445 return mtu;
1446 }
1447
1448 static int link_configure_mtu(Link *link) {
1449 uint32_t mtu;
1450
1451 assert(link);
1452 assert(link->network);
1453
1454 if (link->network->mtu > 0)
1455 return link_set_mtu(link, link->network->mtu);
1456
1457 mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1458 if (link->mtu >= mtu)
1459 return 0;
1460
1461 log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1462 "If it is not desired, then please explicitly specify MTUBytes= setting.",
1463 link->mtu, mtu);
1464
1465 return link_set_mtu(link, mtu);
1466 }
1467
1468 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1469 int r;
1470
1471 assert(m);
1472 assert(link);
1473 assert(link->ifname);
1474
1475 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1476 return 1;
1477
1478 r = sd_netlink_message_get_errno(m);
1479 if (r < 0)
1480 log_link_message_warning_errno(link, m, r, "Could not set link flags, ignoring");
1481
1482 return 1;
1483 }
1484
1485 static int link_set_flags(Link *link) {
1486 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1487 unsigned ifi_change = 0;
1488 unsigned ifi_flags = 0;
1489 int r;
1490
1491 assert(link);
1492 assert(link->manager);
1493 assert(link->manager->rtnl);
1494
1495 if (link->flags & IFF_LOOPBACK)
1496 return 0;
1497
1498 if (!link->network)
1499 return 0;
1500
1501 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1502 return 0;
1503
1504 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1505 if (r < 0)
1506 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1507
1508 if (link->network->arp >= 0) {
1509 ifi_change |= IFF_NOARP;
1510 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1511 }
1512
1513 if (link->network->multicast >= 0) {
1514 ifi_change |= IFF_MULTICAST;
1515 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1516 }
1517
1518 if (link->network->allmulticast >= 0) {
1519 ifi_change |= IFF_ALLMULTI;
1520 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1521 }
1522
1523 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1524 if (r < 0)
1525 return log_link_error_errno(link, r, "Could not set link flags: %m");
1526
1527 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1528 link_netlink_destroy_callback, link);
1529 if (r < 0)
1530 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1531
1532 link_ref(link);
1533
1534 return 0;
1535 }
1536
1537 static int link_acquire_ipv6_conf(Link *link) {
1538 int r;
1539
1540 assert(link);
1541
1542 if (link_ipv6_accept_ra_enabled(link)) {
1543 assert(link->ndisc);
1544
1545 log_link_debug(link, "Discovering IPv6 routers");
1546
1547 r = sd_ndisc_start(link->ndisc);
1548 if (r < 0 && r != -EBUSY)
1549 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1550 }
1551
1552 if (link_radv_enabled(link)) {
1553 assert(link->radv);
1554 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1555
1556 log_link_debug(link, "Starting IPv6 Router Advertisements");
1557
1558 r = radv_emit_dns(link);
1559 if (r < 0)
1560 return log_link_warning_errno(link, r, "Failed to configure DNS or Domains in IPv6 Router Advertisement: %m");
1561
1562 r = sd_radv_start(link->radv);
1563 if (r < 0 && r != -EBUSY)
1564 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1565 }
1566
1567 if (link_dhcp6_enabled(link) && IN_SET(link->network->dhcp6_without_ra,
1568 DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST,
1569 DHCP6_CLIENT_START_MODE_SOLICIT)) {
1570 assert(link->dhcp6_client);
1571 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1572
1573 r = dhcp6_request_address(link, link->network->dhcp6_without_ra == DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST);
1574 if (r < 0 && r != -EBUSY)
1575 return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m");
1576 else
1577 log_link_debug(link, "Acquiring DHCPv6 lease");
1578 }
1579
1580 (void) dhcp6_request_prefix_delegation(link);
1581
1582 return 0;
1583 }
1584
1585 static int link_acquire_ipv4_conf(Link *link) {
1586 int r;
1587
1588 assert(link);
1589 assert(link->manager);
1590 assert(link->manager->event);
1591
1592 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1593 assert(link->ipv4ll);
1594
1595 log_link_debug(link, "Acquiring IPv4 link-local address");
1596
1597 r = sd_ipv4ll_start(link->ipv4ll);
1598 if (r < 0)
1599 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1600 }
1601
1602 if (link_dhcp4_enabled(link)) {
1603 assert(link->dhcp_client);
1604
1605 log_link_debug(link, "Acquiring DHCPv4 lease");
1606
1607 r = sd_dhcp_client_start(link->dhcp_client);
1608 if (r < 0)
1609 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1610 }
1611
1612 return 0;
1613 }
1614
1615 static int link_acquire_conf(Link *link) {
1616 int r;
1617
1618 assert(link);
1619
1620 r = link_acquire_ipv4_conf(link);
1621 if (r < 0)
1622 return r;
1623
1624 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1625 r = link_acquire_ipv6_conf(link);
1626 if (r < 0)
1627 return r;
1628 }
1629
1630 if (link_lldp_emit_enabled(link)) {
1631 r = link_lldp_emit_start(link);
1632 if (r < 0)
1633 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1634 }
1635
1636 return 0;
1637 }
1638
1639 bool link_has_carrier(Link *link) {
1640 /* see Documentation/networking/operstates.txt in the kernel sources */
1641
1642 if (link->kernel_operstate == IF_OPER_UP)
1643 return true;
1644
1645 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1646 /* operstate may not be implemented, so fall back to flags */
1647 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1648 !FLAGS_SET(link->flags, IFF_DORMANT))
1649 return true;
1650
1651 return false;
1652 }
1653
1654 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1655 int r;
1656
1657 assert(link);
1658
1659 link->setting_genmode = false;
1660
1661 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1662 return 1;
1663
1664 r = sd_netlink_message_get_errno(m);
1665 if (r < 0)
1666 log_link_message_warning_errno(link, m, r, "Could not set address genmode for interface, ignoring");
1667 else
1668 log_link_debug(link, "Setting address genmode done.");
1669
1670 if (link->state == LINK_STATE_INITIALIZED) {
1671 r = link_configure_continue(link);
1672 if (r < 0)
1673 link_enter_failed(link);
1674 }
1675
1676 return 1;
1677 }
1678
1679 static int link_configure_addrgen_mode(Link *link) {
1680 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1681 uint8_t ipv6ll_mode;
1682 int r;
1683
1684 assert(link);
1685 assert(link->network);
1686 assert(link->manager);
1687 assert(link->manager->rtnl);
1688
1689 if (!socket_ipv6_is_supported() || link->setting_genmode)
1690 return 0;
1691
1692 log_link_debug(link, "Setting address genmode for link");
1693
1694 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1695 if (r < 0)
1696 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1697
1698 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1699 if (r < 0)
1700 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1701
1702 r = sd_netlink_message_open_container(req, AF_INET6);
1703 if (r < 0)
1704 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1705
1706 if (!link_ipv6ll_enabled(link))
1707 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1708 else if (link->network->ipv6ll_address_gen_mode < 0) {
1709 r = sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL);
1710 if (r < 0) {
1711 /* The file may not exist. And even if it exists, when stable_secret is unset,
1712 * reading the file fails with EIO. */
1713 log_link_debug_errno(link, r, "Failed to read sysctl property stable_secret: %m");
1714
1715 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1716 } else
1717 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1718 } else
1719 ipv6ll_mode = link->network->ipv6ll_address_gen_mode;
1720
1721 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1722 if (r < 0)
1723 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1724
1725 r = sd_netlink_message_close_container(req);
1726 if (r < 0)
1727 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1728
1729 r = sd_netlink_message_close_container(req);
1730 if (r < 0)
1731 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1732
1733 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1734 link_netlink_destroy_callback, link);
1735 if (r < 0)
1736 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1737
1738 link_ref(link);
1739 link->setting_genmode = true;
1740
1741 return 0;
1742 }
1743
1744 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1745 int r;
1746
1747 assert(link);
1748
1749 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1750 return 1;
1751
1752 r = sd_netlink_message_get_errno(m);
1753 if (r < 0)
1754 /* we warn but don't fail the link, as it may be brought up later */
1755 log_link_message_warning_errno(link, m, r, "Could not bring up interface");
1756
1757 return 1;
1758 }
1759
1760 static int link_up(Link *link) {
1761 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1762 int r;
1763
1764 assert(link);
1765 assert(link->network);
1766 assert(link->manager);
1767 assert(link->manager->rtnl);
1768
1769 log_link_debug(link, "Bringing link up");
1770
1771 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1772 if (r < 0)
1773 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1774
1775 /* set it free if not enslaved with networkd */
1776 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1777 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1778 if (r < 0)
1779 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1780 }
1781
1782 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1783 if (r < 0)
1784 return log_link_error_errno(link, r, "Could not set link flags: %m");
1785
1786 if (link->network->mac) {
1787 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1788 if (r < 0)
1789 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1790 }
1791
1792 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1793 link_netlink_destroy_callback, link);
1794 if (r < 0)
1795 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1796
1797 link_ref(link);
1798
1799 return 0;
1800 }
1801
1802 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1803 int r;
1804
1805 assert(link);
1806
1807 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1808 return 1;
1809
1810 r = sd_netlink_message_get_errno(m);
1811 if (r < 0)
1812 log_link_message_warning_errno(link, m, r, "Could not bring down interface");
1813
1814 return 1;
1815 }
1816
1817 int link_down(Link *link, link_netlink_message_handler_t callback) {
1818 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1819 int r;
1820
1821 assert(link);
1822 assert(link->manager);
1823 assert(link->manager->rtnl);
1824
1825 log_link_debug(link, "Bringing link down");
1826
1827 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1828 RTM_SETLINK, link->ifindex);
1829 if (r < 0)
1830 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1831
1832 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1833 if (r < 0)
1834 return log_link_error_errno(link, r, "Could not set link flags: %m");
1835
1836 r = netlink_call_async(link->manager->rtnl, NULL, req,
1837 callback ?: link_down_handler,
1838 link_netlink_destroy_callback, link);
1839 if (r < 0)
1840 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1841
1842 link_ref(link);
1843
1844 return 0;
1845 }
1846
1847 static int link_group_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1848 int r;
1849
1850 assert(link);
1851
1852 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1853 return 1;
1854
1855 r = sd_netlink_message_get_errno(m);
1856 if (r < 0)
1857 log_link_message_warning_errno(link, m, r, "Could not set group for the interface");
1858
1859 return 1;
1860 }
1861
1862 static int link_set_group(Link *link) {
1863 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1864 int r;
1865
1866 assert(link);
1867 assert(link->network);
1868 assert(link->manager);
1869 assert(link->manager->rtnl);
1870
1871 if (link->network->group <= 0)
1872 return 0;
1873
1874 log_link_debug(link, "Setting group");
1875
1876 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1877 if (r < 0)
1878 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1879
1880 r = sd_netlink_message_append_u32(req, IFLA_GROUP, link->network->group);
1881 if (r < 0)
1882 return log_link_error_errno(link, r, "Could not set link group: %m");
1883
1884 r = netlink_call_async(link->manager->rtnl, NULL, req, link_group_handler,
1885 link_netlink_destroy_callback, link);
1886 if (r < 0)
1887 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1888
1889 link_ref(link);
1890
1891 return 0;
1892 }
1893
1894 static int link_handle_bound_to_list(Link *link) {
1895 Link *l;
1896 Iterator i;
1897 int r;
1898 bool required_up = false;
1899 bool link_is_up = false;
1900
1901 assert(link);
1902
1903 if (hashmap_isempty(link->bound_to_links))
1904 return 0;
1905
1906 if (link->flags & IFF_UP)
1907 link_is_up = true;
1908
1909 HASHMAP_FOREACH (l, link->bound_to_links, i)
1910 if (link_has_carrier(l)) {
1911 required_up = true;
1912 break;
1913 }
1914
1915 if (!required_up && link_is_up) {
1916 r = link_down(link, NULL);
1917 if (r < 0)
1918 return r;
1919 } else if (required_up && !link_is_up) {
1920 r = link_up(link);
1921 if (r < 0)
1922 return r;
1923 }
1924
1925 return 0;
1926 }
1927
1928 static int link_handle_bound_by_list(Link *link) {
1929 Iterator i;
1930 Link *l;
1931 int r;
1932
1933 assert(link);
1934
1935 if (hashmap_isempty(link->bound_by_links))
1936 return 0;
1937
1938 HASHMAP_FOREACH (l, link->bound_by_links, i) {
1939 r = link_handle_bound_to_list(l);
1940 if (r < 0)
1941 return r;
1942 }
1943
1944 return 0;
1945 }
1946
1947 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1948 int r;
1949
1950 assert(link);
1951 assert(carrier);
1952
1953 if (link == carrier)
1954 return 0;
1955
1956 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1957 return 0;
1958
1959 r = hashmap_ensure_allocated(h, NULL);
1960 if (r < 0)
1961 return r;
1962
1963 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1964 if (r < 0)
1965 return r;
1966
1967 return 0;
1968 }
1969
1970 static int link_new_bound_by_list(Link *link) {
1971 Manager *m;
1972 Link *carrier;
1973 Iterator i;
1974 int r;
1975 bool list_updated = false;
1976
1977 assert(link);
1978 assert(link->manager);
1979
1980 m = link->manager;
1981
1982 HASHMAP_FOREACH(carrier, m->links, i) {
1983 if (!carrier->network)
1984 continue;
1985
1986 if (strv_isempty(carrier->network->bind_carrier))
1987 continue;
1988
1989 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
1990 r = link_put_carrier(link, carrier, &link->bound_by_links);
1991 if (r < 0)
1992 return r;
1993
1994 list_updated = true;
1995 }
1996 }
1997
1998 if (list_updated)
1999 link_dirty(link);
2000
2001 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2002 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2003 if (r < 0)
2004 return r;
2005
2006 link_dirty(carrier);
2007 }
2008
2009 return 0;
2010 }
2011
2012 static int link_new_bound_to_list(Link *link) {
2013 Manager *m;
2014 Link *carrier;
2015 Iterator i;
2016 int r;
2017 bool list_updated = false;
2018
2019 assert(link);
2020 assert(link->manager);
2021
2022 if (!link->network)
2023 return 0;
2024
2025 if (strv_isempty(link->network->bind_carrier))
2026 return 0;
2027
2028 m = link->manager;
2029
2030 HASHMAP_FOREACH (carrier, m->links, i) {
2031 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
2032 r = link_put_carrier(link, carrier, &link->bound_to_links);
2033 if (r < 0)
2034 return r;
2035
2036 list_updated = true;
2037 }
2038 }
2039
2040 if (list_updated)
2041 link_dirty(link);
2042
2043 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2044 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2045 if (r < 0)
2046 return r;
2047
2048 link_dirty(carrier);
2049 }
2050
2051 return 0;
2052 }
2053
2054 static int link_new_carrier_maps(Link *link) {
2055 int r;
2056
2057 r = link_new_bound_by_list(link);
2058 if (r < 0)
2059 return r;
2060
2061 r = link_handle_bound_by_list(link);
2062 if (r < 0)
2063 return r;
2064
2065 r = link_new_bound_to_list(link);
2066 if (r < 0)
2067 return r;
2068
2069 r = link_handle_bound_to_list(link);
2070 if (r < 0)
2071 return r;
2072
2073 return 0;
2074 }
2075
2076 static void link_free_bound_to_list(Link *link) {
2077 Link *bound_to;
2078 Iterator i;
2079
2080 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2081 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2082
2083 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2084 link_dirty(bound_to);
2085 }
2086
2087 return;
2088 }
2089
2090 static void link_free_bound_by_list(Link *link) {
2091 Link *bound_by;
2092 Iterator i;
2093
2094 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2095 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2096
2097 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2098 link_dirty(bound_by);
2099 link_handle_bound_to_list(bound_by);
2100 }
2101 }
2102
2103 return;
2104 }
2105
2106 static void link_free_carrier_maps(Link *link) {
2107 bool list_updated = false;
2108
2109 assert(link);
2110
2111 if (!hashmap_isempty(link->bound_to_links)) {
2112 link_free_bound_to_list(link);
2113 list_updated = true;
2114 }
2115
2116 if (!hashmap_isempty(link->bound_by_links)) {
2117 link_free_bound_by_list(link);
2118 list_updated = true;
2119 }
2120
2121 if (list_updated)
2122 link_dirty(link);
2123
2124 return;
2125 }
2126
2127 static int link_append_to_master(Link *link, NetDev *netdev) {
2128 Link *master;
2129 int r;
2130
2131 assert(link);
2132 assert(netdev);
2133
2134 r = link_get(link->manager, netdev->ifindex, &master);
2135 if (r < 0)
2136 return r;
2137
2138 r = set_ensure_put(&master->slaves, NULL, link);
2139 if (r <= 0)
2140 return r;
2141
2142 link_ref(link);
2143 return 0;
2144 }
2145
2146 static void link_drop_from_master(Link *link, NetDev *netdev) {
2147 Link *master;
2148
2149 assert(link);
2150
2151 if (!link->manager || !netdev)
2152 return;
2153
2154 if (link_get(link->manager, netdev->ifindex, &master) < 0)
2155 return;
2156
2157 link_unref(set_remove(master->slaves, link));
2158 }
2159
2160 static void link_detach_from_manager(Link *link) {
2161 if (!link || !link->manager)
2162 return;
2163
2164 link_unref(set_remove(link->manager->links_requesting_uuid, link));
2165 link_clean(link);
2166
2167 /* The following must be called at last. */
2168 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2169 link_unref(link);
2170 }
2171
2172 void link_drop(Link *link) {
2173 if (!link || link->state == LINK_STATE_LINGER)
2174 return;
2175
2176 link_set_state(link, LINK_STATE_LINGER);
2177
2178 link_free_carrier_maps(link);
2179
2180 if (link->network) {
2181 link_drop_from_master(link, link->network->bridge);
2182 link_drop_from_master(link, link->network->bond);
2183 }
2184
2185 log_link_debug(link, "Link removed");
2186
2187 (void) unlink(link->state_file);
2188 link_detach_from_manager(link);
2189 }
2190
2191 static int link_joined(Link *link) {
2192 int r;
2193
2194 assert(link);
2195 assert(link->network);
2196
2197 if (!hashmap_isempty(link->bound_to_links)) {
2198 r = link_handle_bound_to_list(link);
2199 if (r < 0)
2200 return r;
2201 } else if (!(link->flags & IFF_UP)) {
2202 r = link_up(link);
2203 if (r < 0) {
2204 link_enter_failed(link);
2205 return r;
2206 }
2207 }
2208
2209 if (link->network->bridge) {
2210 r = link_set_bridge(link);
2211 if (r < 0)
2212 log_link_error_errno(link, r, "Could not set bridge message: %m");
2213
2214 r = link_append_to_master(link, link->network->bridge);
2215 if (r < 0)
2216 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2217 }
2218
2219 if (link->network->bond) {
2220 r = link_set_bond(link);
2221 if (r < 0)
2222 log_link_error_errno(link, r, "Could not set bond message: %m");
2223
2224 r = link_append_to_master(link, link->network->bond);
2225 if (r < 0)
2226 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2227 }
2228
2229 if (link->network->use_br_vlan &&
2230 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2231 r = link_set_bridge_vlan(link);
2232 if (r < 0)
2233 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2234 }
2235
2236 /* Skip setting up addresses until it gets carrier,
2237 or it would try to set addresses twice,
2238 which is bad for non-idempotent steps. */
2239 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2240 return 0;
2241
2242 link_set_state(link, LINK_STATE_CONFIGURING);
2243 return link_request_set_addresses(link);
2244 }
2245
2246 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2247 int r;
2248
2249 assert(link);
2250 assert(link->network);
2251 assert(link->enslaving > 0);
2252
2253 link->enslaving--;
2254
2255 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2256 return 1;
2257
2258 r = sd_netlink_message_get_errno(m);
2259 if (r < 0 && r != -EEXIST) {
2260 log_link_message_warning_errno(link, m, r, "Could not join netdev");
2261 link_enter_failed(link);
2262 return 1;
2263 }
2264
2265 log_link_debug(link, "Joined netdev");
2266
2267 if (link->enslaving == 0) {
2268 r = link_joined(link);
2269 if (r < 0)
2270 link_enter_failed(link);
2271 }
2272
2273 return 1;
2274 }
2275
2276 static int link_enter_join_netdev(Link *link) {
2277 NetDev *netdev;
2278 Iterator i;
2279 int r;
2280
2281 assert(link);
2282 assert(link->network);
2283 assert(link->state == LINK_STATE_INITIALIZED);
2284
2285 link_set_state(link, LINK_STATE_CONFIGURING);
2286
2287 link_dirty(link);
2288 link->enslaving = 0;
2289
2290 if (link->network->bond) {
2291 if (link->network->bond->state == NETDEV_STATE_READY &&
2292 link->network->bond->ifindex == link->master_ifindex)
2293 return link_joined(link);
2294
2295 log_struct(LOG_DEBUG,
2296 LOG_LINK_INTERFACE(link),
2297 LOG_NETDEV_INTERFACE(link->network->bond),
2298 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2299
2300 link->enslaving++;
2301
2302 r = netdev_join(link->network->bond, link, netdev_join_handler);
2303 if (r < 0) {
2304 log_struct_errno(LOG_WARNING, r,
2305 LOG_LINK_INTERFACE(link),
2306 LOG_NETDEV_INTERFACE(link->network->bond),
2307 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2308 link_enter_failed(link);
2309 return r;
2310 }
2311 }
2312
2313 if (link->network->bridge) {
2314 log_struct(LOG_DEBUG,
2315 LOG_LINK_INTERFACE(link),
2316 LOG_NETDEV_INTERFACE(link->network->bridge),
2317 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2318
2319 link->enslaving++;
2320
2321 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2322 if (r < 0) {
2323 log_struct_errno(LOG_WARNING, r,
2324 LOG_LINK_INTERFACE(link),
2325 LOG_NETDEV_INTERFACE(link->network->bridge),
2326 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2327 link_enter_failed(link);
2328 return r;
2329 }
2330 }
2331
2332 if (link->network->vrf) {
2333 log_struct(LOG_DEBUG,
2334 LOG_LINK_INTERFACE(link),
2335 LOG_NETDEV_INTERFACE(link->network->vrf),
2336 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2337
2338 link->enslaving++;
2339
2340 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2341 if (r < 0) {
2342 log_struct_errno(LOG_WARNING, r,
2343 LOG_LINK_INTERFACE(link),
2344 LOG_NETDEV_INTERFACE(link->network->vrf),
2345 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2346 link_enter_failed(link);
2347 return r;
2348 }
2349 }
2350
2351 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2352
2353 if (netdev->ifindex > 0)
2354 /* Assume already enslaved. */
2355 continue;
2356
2357 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2358 continue;
2359
2360 log_struct(LOG_DEBUG,
2361 LOG_LINK_INTERFACE(link),
2362 LOG_NETDEV_INTERFACE(netdev),
2363 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2364
2365 link->enslaving++;
2366
2367 r = netdev_join(netdev, link, netdev_join_handler);
2368 if (r < 0) {
2369 log_struct_errno(LOG_WARNING, r,
2370 LOG_LINK_INTERFACE(link),
2371 LOG_NETDEV_INTERFACE(netdev),
2372 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2373 link_enter_failed(link);
2374 return r;
2375 }
2376 }
2377
2378 if (link->enslaving == 0)
2379 return link_joined(link);
2380
2381 return 0;
2382 }
2383
2384 static int link_set_ipv4_forward(Link *link) {
2385 int r;
2386
2387 if (!link_ipv4_forward_enabled(link))
2388 return 0;
2389
2390 /* We propagate the forwarding flag from one interface to the
2391 * global setting one way. This means: as long as at least one
2392 * interface was configured at any time that had IP forwarding
2393 * enabled the setting will stay on for good. We do this
2394 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2395 * somewhat in sync (see below). */
2396
2397 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2398 if (r < 0)
2399 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2400
2401 return 0;
2402 }
2403
2404 static int link_set_ipv6_forward(Link *link) {
2405 int r;
2406
2407 if (!link_ipv6_forward_enabled(link))
2408 return 0;
2409
2410 /* On Linux, the IPv6 stack does not know a per-interface
2411 * packet forwarding setting: either packet forwarding is on
2412 * for all, or off for all. We hence don't bother with a
2413 * per-interface setting, but simply propagate the interface
2414 * flag, if it is set, to the global flag, one-way. Note that
2415 * while IPv4 would allow a per-interface flag, we expose the
2416 * same behaviour there and also propagate the setting from
2417 * one to all, to keep things simple (see above). */
2418
2419 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2420 if (r < 0)
2421 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2422
2423 return 0;
2424 }
2425
2426 static int link_set_ipv6_privacy_extensions(Link *link) {
2427 IPv6PrivacyExtensions s;
2428 int r;
2429
2430 s = link_ipv6_privacy_extensions(link);
2431 if (s < 0)
2432 return 0;
2433
2434 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2435 if (r < 0)
2436 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2437
2438 return 0;
2439 }
2440
2441 static int link_set_ipv6_accept_ra(Link *link) {
2442 int r;
2443
2444 /* Make this a NOP if IPv6 is not available */
2445 if (!socket_ipv6_is_supported())
2446 return 0;
2447
2448 if (link->flags & IFF_LOOPBACK)
2449 return 0;
2450
2451 if (!link->network)
2452 return 0;
2453
2454 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2455 if (r < 0)
2456 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2457
2458 return 0;
2459 }
2460
2461 static int link_set_ipv6_dad_transmits(Link *link) {
2462 int r;
2463
2464 /* Make this a NOP if IPv6 is not available */
2465 if (!socket_ipv6_is_supported())
2466 return 0;
2467
2468 if (link->flags & IFF_LOOPBACK)
2469 return 0;
2470
2471 if (!link->network)
2472 return 0;
2473
2474 if (link->network->ipv6_dad_transmits < 0)
2475 return 0;
2476
2477 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2478 if (r < 0)
2479 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2480
2481 return 0;
2482 }
2483
2484 static int link_set_ipv6_hop_limit(Link *link) {
2485 int r;
2486
2487 /* Make this a NOP if IPv6 is not available */
2488 if (!socket_ipv6_is_supported())
2489 return 0;
2490
2491 if (link->flags & IFF_LOOPBACK)
2492 return 0;
2493
2494 if (!link->network)
2495 return 0;
2496
2497 if (link->network->ipv6_hop_limit < 0)
2498 return 0;
2499
2500 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2501 if (r < 0)
2502 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2503
2504 return 0;
2505 }
2506
2507 static int link_set_ipv6_mtu(Link *link) {
2508 int r;
2509
2510 /* Make this a NOP if IPv6 is not available */
2511 if (!socket_ipv6_is_supported())
2512 return 0;
2513
2514 if (link->flags & IFF_LOOPBACK)
2515 return 0;
2516
2517 if (link->network->ipv6_mtu == 0)
2518 return 0;
2519
2520 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
2521 * on the interface. Bump up IPv6 MTU bytes to IPV6_MTU_MIN. */
2522 if (link->network->ipv6_mtu < IPV6_MIN_MTU) {
2523 log_link_notice(link, "Bumping IPv6 MTU to "STRINGIFY(IPV6_MIN_MTU)" byte minimum required");
2524 link->network->ipv6_mtu = IPV6_MIN_MTU;
2525 }
2526
2527 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2528 if (r < 0) {
2529 if (link->mtu < link->network->ipv6_mtu)
2530 log_link_warning(link, "Cannot set IPv6 MTU %"PRIu32" higher than device MTU %"PRIu32,
2531 link->network->ipv6_mtu, link->mtu);
2532 else
2533 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2534 }
2535
2536 link->ipv6_mtu_set = true;
2537
2538 return 0;
2539 }
2540
2541 static int link_set_ipv4_accept_local(Link *link) {
2542 int r;
2543
2544 if (link->flags & IFF_LOOPBACK)
2545 return 0;
2546
2547 if (link->network->ipv4_accept_local < 0)
2548 return 0;
2549
2550 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "accept_local", link->network->ipv4_accept_local);
2551 if (r < 0)
2552 log_link_warning_errno(link, r, "Cannot set IPv4 accept_local flag for interface: %m");
2553
2554 return 0;
2555 }
2556
2557 static bool link_is_static_address_configured(Link *link, Address *address) {
2558 Address *net_address;
2559
2560 assert(link);
2561 assert(address);
2562
2563 if (!link->network)
2564 return false;
2565
2566 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2567 if (address_equal(net_address, address))
2568 return true;
2569
2570 return false;
2571 }
2572
2573 static bool link_is_neighbor_configured(Link *link, Neighbor *neighbor) {
2574 Neighbor *net_neighbor;
2575
2576 assert(link);
2577 assert(neighbor);
2578
2579 if (!link->network)
2580 return false;
2581
2582 LIST_FOREACH(neighbors, net_neighbor, link->network->neighbors)
2583 if (neighbor_equal(net_neighbor, neighbor))
2584 return true;
2585
2586 return false;
2587 }
2588
2589 static bool link_is_static_route_configured(Link *link, Route *route) {
2590 Route *net_route;
2591
2592 assert(link);
2593 assert(route);
2594
2595 if (!link->network)
2596 return false;
2597
2598 LIST_FOREACH(routes, net_route, link->network->static_routes)
2599 if (route_equal(net_route, route))
2600 return true;
2601
2602 return false;
2603 }
2604
2605 static bool link_address_is_dynamic(Link *link, Address *address) {
2606 Route *route;
2607 Iterator i;
2608
2609 assert(link);
2610 assert(address);
2611
2612 if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2613 return true;
2614
2615 /* Even when the address is leased from a DHCP server, networkd assign the address
2616 * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2617 * corresponding routes with RTPROT_DHCP. */
2618 SET_FOREACH(route, link->routes_foreign, i) {
2619 if (route->protocol != RTPROT_DHCP)
2620 continue;
2621
2622 if (address->family != route->family)
2623 continue;
2624
2625 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2626 return true;
2627 }
2628
2629 return false;
2630 }
2631
2632 static int link_enumerate_ipv6_tentative_addresses(Link *link) {
2633 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
2634 sd_netlink_message *addr;
2635 int r;
2636
2637 assert(link);
2638 assert(link->manager);
2639 assert(link->manager->rtnl);
2640
2641 r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_GETADDR, 0, AF_INET6);
2642 if (r < 0)
2643 return r;
2644
2645 r = sd_netlink_call(link->manager->rtnl, req, 0, &reply);
2646 if (r < 0)
2647 return r;
2648
2649 for (addr = reply; addr; addr = sd_netlink_message_next(addr)) {
2650 unsigned char flags;
2651 int ifindex;
2652
2653 r = sd_rtnl_message_addr_get_ifindex(addr, &ifindex);
2654 if (r < 0) {
2655 log_link_warning_errno(link, r, "rtnl: invalid ifindex, ignoring: %m");
2656 continue;
2657 } else if (link->ifindex != ifindex)
2658 continue;
2659
2660 r = sd_rtnl_message_addr_get_flags(addr, &flags);
2661 if (r < 0) {
2662 log_link_warning_errno(link, r, "rtnl: received address message with invalid flags, ignoring: %m");
2663 continue;
2664 } else if (!(flags & IFA_F_TENTATIVE))
2665 continue;
2666
2667 log_link_debug(link, "Found tentative ipv6 link-local address");
2668 (void) manager_rtnl_process_address(link->manager->rtnl, addr, link->manager);
2669 }
2670
2671 return 0;
2672 }
2673
2674 static int link_drop_foreign_config(Link *link) {
2675 Address *address;
2676 Neighbor *neighbor;
2677 Route *route;
2678 Iterator i;
2679 int r;
2680
2681 /* The kernel doesn't notify us about tentative addresses;
2682 * so if ipv6ll is disabled, we need to enumerate them now so we can drop them below */
2683 if (!link_ipv6ll_enabled(link)) {
2684 r = link_enumerate_ipv6_tentative_addresses(link);
2685 if (r < 0)
2686 return r;
2687 }
2688
2689 SET_FOREACH(address, link->addresses_foreign, i) {
2690 /* we consider IPv6LL addresses to be managed by the kernel */
2691 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2692 continue;
2693
2694 if (link_address_is_dynamic(link, address)) {
2695 if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2696 continue;
2697 } else if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2698 continue;
2699
2700 if (link_is_static_address_configured(link, address)) {
2701 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2702 if (r < 0)
2703 return log_link_error_errno(link, r, "Failed to add address: %m");
2704 } else {
2705 r = address_remove(address, link, NULL);
2706 if (r < 0)
2707 return r;
2708 }
2709 }
2710
2711 SET_FOREACH(neighbor, link->neighbors_foreign, i) {
2712 if (link_is_neighbor_configured(link, neighbor)) {
2713 r = neighbor_add(link, neighbor->family, &neighbor->in_addr, &neighbor->lladdr, neighbor->lladdr_size, NULL);
2714 if (r < 0)
2715 return r;
2716 } else {
2717 r = neighbor_remove(neighbor, link, NULL);
2718 if (r < 0)
2719 return r;
2720 }
2721 }
2722
2723 SET_FOREACH(route, link->routes_foreign, i) {
2724 /* do not touch routes managed by the kernel */
2725 if (route->protocol == RTPROT_KERNEL)
2726 continue;
2727
2728 /* do not touch multicast route added by kernel */
2729 /* FIXME: Why the kernel adds this route with protocol RTPROT_BOOT??? We need to investigate that.
2730 * https://tools.ietf.org/html/rfc4862#section-5.4 may explain why. */
2731 if (route->protocol == RTPROT_BOOT &&
2732 route->family == AF_INET6 &&
2733 route->dst_prefixlen == 8 &&
2734 in_addr_equal(AF_INET6, &route->dst, &(union in_addr_union) { .in6 = {{{ 0xff,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0 }}} }))
2735 continue;
2736
2737 if (route->protocol == RTPROT_STATIC && link->network &&
2738 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2739 continue;
2740
2741 if (route->protocol == RTPROT_DHCP && link->network &&
2742 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2743 continue;
2744
2745 if (link_is_static_route_configured(link, route)) {
2746 r = route_add(link, route, NULL);
2747 if (r < 0)
2748 return r;
2749 } else {
2750 r = route_remove(route, link, NULL);
2751 if (r < 0)
2752 return r;
2753 }
2754 }
2755
2756 return 0;
2757 }
2758
2759 static int link_drop_config(Link *link) {
2760 Address *address, *pool_address;
2761 Neighbor *neighbor;
2762 Route *route;
2763 Iterator i;
2764 int r;
2765
2766 SET_FOREACH(address, link->addresses, i) {
2767 /* we consider IPv6LL addresses to be managed by the kernel */
2768 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2769 continue;
2770
2771 r = address_remove(address, link, NULL);
2772 if (r < 0)
2773 return r;
2774
2775 /* If this address came from an address pool, clean up the pool */
2776 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2777 if (address_equal(address, pool_address)) {
2778 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2779 address_free(pool_address);
2780 break;
2781 }
2782 }
2783 }
2784
2785 SET_FOREACH(neighbor, link->neighbors, i) {
2786 r = neighbor_remove(neighbor, link, NULL);
2787 if (r < 0)
2788 return r;
2789 }
2790
2791 SET_FOREACH(route, link->routes, i) {
2792 /* do not touch routes managed by the kernel */
2793 if (route->protocol == RTPROT_KERNEL)
2794 continue;
2795
2796 r = route_remove(route, link, NULL);
2797 if (r < 0)
2798 return r;
2799 }
2800
2801 ndisc_flush(link);
2802
2803 return 0;
2804 }
2805
2806 static int link_configure_ipv4_dad(Link *link) {
2807 Address *address;
2808 int r;
2809
2810 assert(link);
2811 assert(link->network);
2812
2813 LIST_FOREACH(addresses, address, link->network->static_addresses)
2814 if (address->family == AF_INET &&
2815 FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV4)) {
2816 r = configure_ipv4_duplicate_address_detection(link, address);
2817 if (r < 0)
2818 return log_link_error_errno(link, r, "Failed to configure IPv4ACD: %m");
2819 }
2820
2821 return 0;
2822 }
2823
2824 static int link_configure_traffic_control(Link *link) {
2825 TrafficControl *tc;
2826 Iterator i;
2827 int r;
2828
2829 link->tc_configured = false;
2830 link->tc_messages = 0;
2831
2832 ORDERED_HASHMAP_FOREACH(tc, link->network->tc_by_section, i) {
2833 r = traffic_control_configure(link, tc);
2834 if (r < 0)
2835 return r;
2836 }
2837
2838 if (link->tc_messages == 0)
2839 link->tc_configured = true;
2840 else
2841 log_link_debug(link, "Configuring traffic control");
2842
2843 return 0;
2844 }
2845
2846 static int link_configure_sr_iov(Link *link) {
2847 SRIOV *sr_iov;
2848 Iterator i;
2849 int r;
2850
2851 link->sr_iov_configured = false;
2852 link->sr_iov_messages = 0;
2853
2854 ORDERED_HASHMAP_FOREACH(sr_iov, link->network->sr_iov_by_section, i) {
2855 r = sr_iov_configure(link, sr_iov);
2856 if (r < 0)
2857 return r;
2858 }
2859
2860 if (link->sr_iov_messages == 0)
2861 link->sr_iov_configured = true;
2862 else
2863 log_link_debug(link, "Configuring SR-IOV");
2864
2865 return 0;
2866 }
2867
2868 static int link_configure(Link *link) {
2869 int r;
2870
2871 assert(link);
2872 assert(link->network);
2873 assert(link->state == LINK_STATE_INITIALIZED);
2874
2875 r = link_configure_traffic_control(link);
2876 if (r < 0)
2877 return r;
2878
2879 r = link_configure_sr_iov(link);
2880 if (r < 0)
2881 return r;
2882
2883 if (link->iftype == ARPHRD_CAN)
2884 return link_configure_can(link);
2885
2886 /* If IPv6 configured that is static IPv6 address and IPv6LL autoconfiguration is enabled
2887 * for this interface, then enable IPv6 */
2888 (void) link_update_ipv6_sysctl(link);
2889
2890 r = link_set_proxy_arp(link);
2891 if (r < 0)
2892 return r;
2893
2894 r = ipv6_proxy_ndp_addresses_configure(link);
2895 if (r < 0)
2896 return r;
2897
2898 r = link_set_ipv4_forward(link);
2899 if (r < 0)
2900 return r;
2901
2902 r = link_set_ipv6_forward(link);
2903 if (r < 0)
2904 return r;
2905
2906 r = link_set_ipv6_privacy_extensions(link);
2907 if (r < 0)
2908 return r;
2909
2910 r = link_set_ipv6_accept_ra(link);
2911 if (r < 0)
2912 return r;
2913
2914 r = link_set_ipv6_dad_transmits(link);
2915 if (r < 0)
2916 return r;
2917
2918 r = link_set_ipv6_hop_limit(link);
2919 if (r < 0)
2920 return r;
2921
2922 r = link_set_ipv4_accept_local(link);
2923 if (r < 0)
2924 return r;
2925
2926 r = link_set_flags(link);
2927 if (r < 0)
2928 return r;
2929
2930 r = link_set_group(link);
2931 if (r < 0)
2932 return r;
2933
2934 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
2935 r = ipv4ll_configure(link);
2936 if (r < 0)
2937 return r;
2938 }
2939
2940 if (link_dhcp4_enabled(link)) {
2941 r = dhcp4_set_promote_secondaries(link);
2942 if (r < 0)
2943 return r;
2944
2945 r = dhcp4_configure(link);
2946 if (r < 0)
2947 return r;
2948 }
2949
2950 if (link_dhcp4_server_enabled(link)) {
2951 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2952 if (r < 0)
2953 return r;
2954
2955 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2956 if (r < 0)
2957 return r;
2958 }
2959
2960 if (link_dhcp6_enabled(link) ||
2961 link_ipv6_accept_ra_enabled(link)) {
2962 r = dhcp6_configure(link);
2963 if (r < 0)
2964 return r;
2965 }
2966
2967 if (link_ipv6_accept_ra_enabled(link)) {
2968 r = ndisc_configure(link);
2969 if (r < 0)
2970 return r;
2971 }
2972
2973 if (link_radv_enabled(link)) {
2974 r = radv_configure(link);
2975 if (r < 0)
2976 return r;
2977 }
2978
2979 if (link_lldp_rx_enabled(link)) {
2980 r = link_lldp_rx_configure(link);
2981 if (r < 0)
2982 return r;
2983 }
2984
2985 r = link_configure_mtu(link);
2986 if (r < 0)
2987 return r;
2988
2989 r = link_configure_addrgen_mode(link);
2990 if (r < 0)
2991 return r;
2992
2993 r = link_configure_ipv4_dad(link);
2994 if (r < 0)
2995 return r;
2996
2997 return link_configure_continue(link);
2998 }
2999
3000 /* The configuration continues in this separate function, instead of
3001 * including this in the above link_configure() function, for two
3002 * reasons:
3003 * 1) some devices reset the link when the mtu is set, which caused
3004 * an infinite loop here in networkd; see:
3005 * https://github.com/systemd/systemd/issues/6593
3006 * https://github.com/systemd/systemd/issues/9831
3007 * 2) if ipv6ll is disabled, then bringing the interface up must be
3008 * delayed until after we get confirmation from the kernel that
3009 * the addr_gen_mode parameter has been set (via netlink), see:
3010 * https://github.com/systemd/systemd/issues/13882
3011 */
3012 static int link_configure_continue(Link *link) {
3013 int r;
3014
3015 assert(link);
3016 assert(link->network);
3017 assert(link->state == LINK_STATE_INITIALIZED);
3018
3019 if (link->setting_mtu || link->setting_genmode)
3020 return 0;
3021
3022 /* Drop foreign config, but ignore loopback or critical devices.
3023 * We do not want to remove loopback address or addresses used for root NFS. */
3024 if (!(link->flags & IFF_LOOPBACK) &&
3025 link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
3026 r = link_drop_foreign_config(link);
3027 if (r < 0)
3028 return r;
3029 }
3030
3031 /* The kernel resets ipv6 mtu after changing device mtu;
3032 * we must set this here, after we've set device mtu */
3033 r = link_set_ipv6_mtu(link);
3034 if (r < 0)
3035 return r;
3036
3037 if (link_has_carrier(link) || link->network->configure_without_carrier) {
3038 r = link_acquire_conf(link);
3039 if (r < 0)
3040 return r;
3041 }
3042
3043 return link_enter_join_netdev(link);
3044 }
3045
3046 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3047 assert(duid);
3048
3049 if (duid->raw_data_len > 0)
3050 return 0;
3051
3052 if (duid->type != DUID_TYPE_UUID)
3053 return -EINVAL;
3054
3055 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3056 duid->raw_data_len = sizeof(sd_id128_t);
3057
3058 return 1;
3059 }
3060
3061 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3062 Manager *manager = userdata;
3063 const sd_bus_error *e;
3064 const void *a;
3065 size_t sz;
3066 DUID *duid;
3067 Link *link;
3068 int r;
3069
3070 assert(m);
3071 assert(manager);
3072
3073 e = sd_bus_message_get_error(m);
3074 if (e) {
3075 log_error_errno(sd_bus_error_get_errno(e),
3076 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3077 e->message);
3078 goto configure;
3079 }
3080
3081 r = sd_bus_message_read_array(m, 'y', &a, &sz);
3082 if (r < 0)
3083 goto configure;
3084
3085 if (sz != sizeof(sd_id128_t)) {
3086 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3087 goto configure;
3088 }
3089
3090 memcpy(&manager->product_uuid, a, sz);
3091 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3092 (void) duid_set_uuid(duid, manager->product_uuid);
3093
3094 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3095
3096 configure:
3097 while ((link = set_steal_first(manager->links_requesting_uuid))) {
3098 link_unref(link);
3099
3100 r = link_configure(link);
3101 if (r < 0)
3102 link_enter_failed(link);
3103 }
3104
3105 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3106
3107 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3108 * even if the method fails. */
3109 manager->has_product_uuid = true;
3110
3111 return 1;
3112 }
3113
3114 static bool link_requires_uuid(Link *link) {
3115 const DUID *duid;
3116
3117 assert(link);
3118 assert(link->manager);
3119 assert(link->network);
3120
3121 duid = link_get_duid(link);
3122 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3123 return false;
3124
3125 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3126 return true;
3127
3128 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3129 return true;
3130
3131 return false;
3132 }
3133
3134 static int link_configure_duid(Link *link) {
3135 Manager *m;
3136 DUID *duid;
3137 int r;
3138
3139 assert(link);
3140 assert(link->manager);
3141 assert(link->network);
3142
3143 m = link->manager;
3144 duid = link_get_duid(link);
3145
3146 if (!link_requires_uuid(link))
3147 return 1;
3148
3149 if (m->has_product_uuid) {
3150 (void) duid_set_uuid(duid, m->product_uuid);
3151 return 1;
3152 }
3153
3154 if (!m->links_requesting_uuid) {
3155 r = manager_request_product_uuid(m, link);
3156 if (r < 0) {
3157 if (r == -ENOMEM)
3158 return r;
3159
3160 log_link_warning_errno(link, r,
3161 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3162 return 1;
3163 }
3164 } else {
3165 r = set_put(m->links_requesting_uuid, link);
3166 if (r < 0)
3167 return log_oom();
3168 if (r > 0)
3169 link_ref(link);
3170
3171 r = set_put(m->duids_requesting_uuid, duid);
3172 if (r < 0)
3173 return log_oom();
3174 }
3175
3176 return 0;
3177 }
3178
3179 static int link_reconfigure_internal(Link *link, sd_netlink_message *m, bool force) {
3180 Network *network;
3181 int r;
3182
3183 if (m) {
3184 _cleanup_strv_free_ char **s = NULL;
3185
3186 r = sd_netlink_message_get_errno(m);
3187 if (r < 0)
3188 return r;
3189
3190 r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3191 if (r < 0 && r != -ENODATA)
3192 return r;
3193
3194 strv_free_and_replace(link->alternative_names, s);
3195 }
3196
3197 r = network_get(link->manager, link->iftype, link->sd_device,
3198 link->ifname, link->alternative_names, link->driver,
3199 &link->mac, &link->permanent_mac,
3200 link->wlan_iftype, link->ssid, &link->bssid, &network);
3201 if (r == -ENOENT) {
3202 link_enter_unmanaged(link);
3203 return 0;
3204 } else if (r == 0 && network->unmanaged) {
3205 link_enter_unmanaged(link);
3206 return 0;
3207 } else if (r < 0)
3208 return r;
3209
3210 if (link->network == network && !force)
3211 return 0;
3212
3213 log_link_info(link, "Re-configuring with %s", network->filename);
3214
3215 /* Dropping old .network file */
3216 r = link_stop_clients(link, false);
3217 if (r < 0)
3218 return r;
3219
3220 if (link_dhcp4_server_enabled(link))
3221 (void) sd_dhcp_server_stop(link->dhcp_server);
3222
3223 r = link_drop_config(link);
3224 if (r < 0)
3225 return r;
3226
3227 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3228 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3229 r = link_drop_foreign_config(link);
3230 if (r < 0)
3231 return r;
3232 }
3233
3234 link_free_carrier_maps(link);
3235 link_free_engines(link);
3236 link->network = network_unref(link->network);
3237
3238 /* Then, apply new .network file */
3239 r = network_apply(network, link);
3240 if (r < 0)
3241 return r;
3242
3243 r = link_new_carrier_maps(link);
3244 if (r < 0)
3245 return r;
3246
3247 link_set_state(link, LINK_STATE_INITIALIZED);
3248 link_dirty(link);
3249
3250 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3251 * link_configure() is called later asynchronously. */
3252 r = link_configure_duid(link);
3253 if (r <= 0)
3254 return r;
3255
3256 r = link_configure(link);
3257 if (r < 0)
3258 return r;
3259
3260 return 0;
3261 }
3262
3263 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3264 int r;
3265
3266 r = link_reconfigure_internal(link, m, false);
3267 if (r < 0)
3268 link_enter_failed(link);
3269
3270 return 1;
3271 }
3272
3273 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3274 int r;
3275
3276 r = link_reconfigure_internal(link, m, true);
3277 if (r < 0)
3278 link_enter_failed(link);
3279
3280 return 1;
3281 }
3282
3283 int link_reconfigure(Link *link, bool force) {
3284 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3285 int r;
3286
3287 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
3288 return 0;
3289
3290 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3291 link->ifindex);
3292 if (r < 0)
3293 return r;
3294
3295 r = netlink_call_async(link->manager->rtnl, NULL, req,
3296 force ? link_force_reconfigure_handler : link_reconfigure_handler,
3297 link_netlink_destroy_callback, link);
3298 if (r < 0)
3299 return r;
3300
3301 link_ref(link);
3302
3303 return 0;
3304 }
3305
3306 static int link_initialized_and_synced(Link *link) {
3307 Network *network;
3308 int r;
3309
3310 assert(link);
3311 assert(link->ifname);
3312 assert(link->manager);
3313
3314 /* We may get called either from the asynchronous netlink callback,
3315 * or directly for link_add() if running in a container. See link_add(). */
3316 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3317 return 0;
3318
3319 log_link_debug(link, "Link state is up-to-date");
3320 link_set_state(link, LINK_STATE_INITIALIZED);
3321
3322 r = link_new_bound_by_list(link);
3323 if (r < 0)
3324 return r;
3325
3326 r = link_handle_bound_by_list(link);
3327 if (r < 0)
3328 return r;
3329
3330 if (!link->network) {
3331 r = wifi_get_info(link);
3332 if (r < 0)
3333 return r;
3334
3335 r = network_get(link->manager, link->iftype, link->sd_device,
3336 link->ifname, link->alternative_names, link->driver,
3337 &link->mac, &link->permanent_mac,
3338 link->wlan_iftype, link->ssid, &link->bssid, &network);
3339 if (r == -ENOENT) {
3340 link_enter_unmanaged(link);
3341 return 0;
3342 } else if (r == 0 && network->unmanaged) {
3343 link_enter_unmanaged(link);
3344 return 0;
3345 } else if (r < 0)
3346 return r;
3347
3348 if (link->flags & IFF_LOOPBACK) {
3349 if (network->link_local != ADDRESS_FAMILY_NO)
3350 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3351
3352 if (network->dhcp != ADDRESS_FAMILY_NO)
3353 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3354
3355 if (network->dhcp_server)
3356 log_link_debug(link, "Ignoring DHCP server for loopback link");
3357 }
3358
3359 r = network_apply(network, link);
3360 if (r < 0)
3361 return r;
3362 }
3363
3364 r = link_new_bound_to_list(link);
3365 if (r < 0)
3366 return r;
3367
3368 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3369 * link_configure() is called later asynchronously. */
3370 r = link_configure_duid(link);
3371 if (r <= 0)
3372 return r;
3373
3374 r = link_configure(link);
3375 if (r < 0)
3376 return r;
3377
3378 return 0;
3379 }
3380
3381 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3382 _cleanup_strv_free_ char **s = NULL;
3383 int r;
3384
3385 r = sd_netlink_message_get_errno(m);
3386 if (r < 0) {
3387 log_link_warning_errno(link, r, "Failed to wait for the interface to be initialized: %m");
3388 link_enter_failed(link);
3389 return 0;
3390 }
3391
3392 r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3393 if (r < 0 && r != -ENODATA) {
3394 link_enter_failed(link);
3395 return 0;
3396 }
3397
3398 strv_free_and_replace(link->alternative_names, s);
3399
3400 r = link_initialized_and_synced(link);
3401 if (r < 0)
3402 link_enter_failed(link);
3403 return 1;
3404 }
3405
3406 int link_initialized(Link *link, sd_device *device) {
3407 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3408 int r;
3409
3410 assert(link);
3411 assert(link->manager);
3412 assert(link->manager->rtnl);
3413 assert(device);
3414
3415 if (link->state != LINK_STATE_PENDING)
3416 return 0;
3417
3418 if (link->sd_device)
3419 return 0;
3420
3421 log_link_debug(link, "udev initialized link");
3422 link_set_state(link, LINK_STATE_INITIALIZED);
3423
3424 link->sd_device = sd_device_ref(device);
3425
3426 /* udev has initialized the link, but we don't know if we have yet
3427 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3428 * when it returns we know that the pending NEWLINKs have already been
3429 * processed and that we are up-to-date */
3430
3431 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3432 link->ifindex);
3433 if (r < 0)
3434 return r;
3435
3436 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3437 link_netlink_destroy_callback, link);
3438 if (r < 0)
3439 return r;
3440
3441 link_ref(link);
3442
3443 return 0;
3444 }
3445
3446 static int link_load(Link *link) {
3447 _cleanup_free_ char *network_file = NULL,
3448 *addresses = NULL,
3449 *routes = NULL,
3450 *dhcp4_address = NULL,
3451 *ipv4ll_address = NULL;
3452 union in_addr_union address;
3453 const char *p;
3454 int r;
3455
3456 assert(link);
3457
3458 r = parse_env_file(NULL, link->state_file,
3459 "NETWORK_FILE", &network_file,
3460 "ADDRESSES", &addresses,
3461 "ROUTES", &routes,
3462 "DHCP4_ADDRESS", &dhcp4_address,
3463 "IPV4LL_ADDRESS", &ipv4ll_address);
3464 if (r < 0 && r != -ENOENT)
3465 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3466
3467 if (network_file) {
3468 Network *network;
3469 char *suffix;
3470
3471 /* drop suffix */
3472 suffix = strrchr(network_file, '.');
3473 if (!suffix) {
3474 log_link_debug(link, "Failed to get network name from %s", network_file);
3475 goto network_file_fail;
3476 }
3477 *suffix = '\0';
3478
3479 r = network_get_by_name(link->manager, basename(network_file), &network);
3480 if (r < 0) {
3481 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3482 goto network_file_fail;
3483 }
3484
3485 r = network_apply(network, link);
3486 if (r < 0)
3487 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3488 }
3489
3490 network_file_fail:
3491
3492 if (addresses) {
3493 p = addresses;
3494
3495 for (;;) {
3496 _cleanup_free_ char *address_str = NULL;
3497 char *prefixlen_str;
3498 int family;
3499 unsigned char prefixlen;
3500
3501 r = extract_first_word(&p, &address_str, NULL, 0);
3502 if (r < 0) {
3503 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3504 continue;
3505 }
3506 if (r == 0)
3507 break;
3508
3509 prefixlen_str = strchr(address_str, '/');
3510 if (!prefixlen_str) {
3511 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3512 continue;
3513 }
3514
3515 *prefixlen_str++ = '\0';
3516
3517 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3518 if (r != 1) {
3519 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3520 continue;
3521 }
3522
3523 r = in_addr_from_string_auto(address_str, &family, &address);
3524 if (r < 0) {
3525 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3526 continue;
3527 }
3528
3529 r = address_add(link, family, &address, prefixlen, NULL);
3530 if (r < 0)
3531 return log_link_error_errno(link, r, "Failed to add address: %m");
3532 }
3533 }
3534
3535 if (routes) {
3536 p = routes;
3537
3538 for (;;) {
3539 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3540 _cleanup_(route_freep) Route *tmp = NULL;
3541 _cleanup_free_ char *route_str = NULL;
3542 char *prefixlen_str;
3543 Route *route;
3544
3545 r = extract_first_word(&p, &route_str, NULL, 0);
3546 if (r < 0) {
3547 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3548 continue;
3549 }
3550 if (r == 0)
3551 break;
3552
3553 prefixlen_str = strchr(route_str, '/');
3554 if (!prefixlen_str) {
3555 log_link_debug(link, "Failed to parse route %s", route_str);
3556 continue;
3557 }
3558
3559 *prefixlen_str++ = '\0';
3560
3561 r = route_new(&tmp);
3562 if (r < 0)
3563 return log_oom();
3564
3565 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%"PRIu32"/"USEC_FMT, &tmp->dst_prefixlen, &tmp->tos, &tmp->priority, &tmp->table, &tmp->lifetime);
3566 if (r != 5) {
3567 log_link_debug(link,
3568 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3569 prefixlen_str);
3570 continue;
3571 }
3572
3573 r = in_addr_from_string_auto(route_str, &tmp->family, &tmp->dst);
3574 if (r < 0) {
3575 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3576 continue;
3577 }
3578
3579 r = route_add(link, tmp, &route);
3580 if (r < 0)
3581 return log_link_error_errno(link, r, "Failed to add route: %m");
3582
3583 if (route->lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3584 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), route->lifetime,
3585 0, route_expire_handler, route);
3586 if (r < 0)
3587 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3588 }
3589
3590 sd_event_source_unref(route->expire);
3591 route->expire = TAKE_PTR(expire);
3592 }
3593 }
3594
3595 if (dhcp4_address) {
3596 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3597 if (r < 0) {
3598 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3599 goto dhcp4_address_fail;
3600 }
3601
3602 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3603 if (r < 0)
3604 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3605
3606 r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
3607 if (r < 0)
3608 return log_link_error_errno(link, r, "Failed to attach DHCPv4 event: %m");
3609
3610 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3611 if (r < 0)
3612 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3613 }
3614
3615 dhcp4_address_fail:
3616
3617 if (ipv4ll_address) {
3618 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3619 if (r < 0) {
3620 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3621 goto ipv4ll_address_fail;
3622 }
3623
3624 r = sd_ipv4ll_new(&link->ipv4ll);
3625 if (r < 0)
3626 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3627
3628 r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
3629 if (r < 0)
3630 return log_link_error_errno(link, r, "Failed to attach IPv4LL event: %m");
3631
3632 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3633 if (r < 0)
3634 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3635 }
3636
3637 ipv4ll_address_fail:
3638
3639 return 0;
3640 }
3641
3642 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3643 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3644 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3645 Link *link;
3646 int r;
3647
3648 assert(m);
3649 assert(m->rtnl);
3650 assert(message);
3651 assert(ret);
3652
3653 r = link_new(m, message, ret);
3654 if (r < 0)
3655 return r;
3656
3657 link = *ret;
3658
3659 log_link_debug(link, "Link %d added", link->ifindex);
3660
3661 r = link_load(link);
3662 if (r < 0)
3663 return r;
3664
3665 if (path_is_read_only_fs("/sys") <= 0) {
3666 /* udev should be around */
3667 sprintf(ifindex_str, "n%d", link->ifindex);
3668 r = sd_device_new_from_device_id(&device, ifindex_str);
3669 if (r < 0) {
3670 log_link_warning_errno(link, r, "Could not find device, waiting for device initialization: %m");
3671 return 0;
3672 }
3673
3674 r = sd_device_get_is_initialized(device);
3675 if (r < 0) {
3676 log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
3677 goto failed;
3678 }
3679 if (r == 0) {
3680 /* not yet ready */
3681 log_link_debug(link, "link pending udev initialization...");
3682 return 0;
3683 }
3684
3685 r = device_is_renaming(device);
3686 if (r < 0) {
3687 log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
3688 goto failed;
3689 }
3690 if (r > 0) {
3691 log_link_debug(link, "Interface is being renamed, pending initialization.");
3692 return 0;
3693 }
3694
3695 r = link_initialized(link, device);
3696 if (r < 0)
3697 goto failed;
3698 } else {
3699 r = link_initialized_and_synced(link);
3700 if (r < 0)
3701 goto failed;
3702 }
3703
3704 return 0;
3705 failed:
3706 link_enter_failed(link);
3707 return r;
3708 }
3709
3710 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3711 int r;
3712
3713 assert(link);
3714
3715 log_link_info(link, "Gained IPv6LL");
3716
3717 link->ipv6ll_address = *address;
3718 link_check_ready(link);
3719
3720 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3721 r = link_acquire_ipv6_conf(link);
3722 if (r < 0) {
3723 link_enter_failed(link);
3724 return r;
3725 }
3726 }
3727
3728 return 0;
3729 }
3730
3731 static int link_carrier_gained(Link *link) {
3732 int r;
3733
3734 assert(link);
3735
3736 r = wifi_get_info(link);
3737 if (r < 0)
3738 return r;
3739 if (r > 0) {
3740 r = link_reconfigure_internal(link, NULL, false);
3741 if (r < 0) {
3742 link_enter_failed(link);
3743 return r;
3744 }
3745 }
3746
3747 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3748 r = link_acquire_conf(link);
3749 if (r < 0) {
3750 link_enter_failed(link);
3751 return r;
3752 }
3753
3754 link_set_state(link, LINK_STATE_CONFIGURING);
3755 r = link_request_set_addresses(link);
3756 if (r < 0)
3757 return r;
3758 }
3759
3760 r = link_handle_bound_by_list(link);
3761 if (r < 0)
3762 return r;
3763
3764 return 0;
3765 }
3766
3767 static int link_carrier_lost(Link *link) {
3768 int r;
3769
3770 assert(link);
3771
3772 if (link->network && link->network->ignore_carrier_loss)
3773 return 0;
3774
3775 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3776 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3777 * configuration and stop the clients as well. */
3778 if (link->setting_mtu)
3779 return 0;
3780
3781 r = link_stop_clients(link, false);
3782 if (r < 0) {
3783 link_enter_failed(link);
3784 return r;
3785 }
3786
3787 if (link_dhcp4_server_enabled(link))
3788 (void) sd_dhcp_server_stop(link->dhcp_server);
3789
3790 r = link_drop_config(link);
3791 if (r < 0)
3792 return r;
3793
3794 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3795 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3796 r = link_drop_foreign_config(link);
3797 if (r < 0)
3798 return r;
3799 }
3800
3801 r = link_handle_bound_by_list(link);
3802 if (r < 0)
3803 return r;
3804
3805 return 0;
3806 }
3807
3808 int link_carrier_reset(Link *link) {
3809 int r;
3810
3811 assert(link);
3812
3813 if (link_has_carrier(link)) {
3814 r = link_carrier_lost(link);
3815 if (r < 0)
3816 return r;
3817
3818 r = link_carrier_gained(link);
3819 if (r < 0)
3820 return r;
3821
3822 log_link_info(link, "Reset carrier");
3823 }
3824
3825 return 0;
3826 }
3827
3828 /* This is called every time an interface admin state changes to up;
3829 * specifically, when IFF_UP flag changes from unset to set */
3830 static int link_admin_state_up(Link *link) {
3831 int r;
3832
3833 /* We set the ipv6 mtu after the device mtu, but the kernel resets
3834 * ipv6 mtu on NETDEV_UP, so we need to reset it. The check for
3835 * ipv6_mtu_set prevents this from trying to set it too early before
3836 * the link->network has been setup; we only need to reset it
3837 * here if we've already set it during normal initialization. */
3838 if (link->ipv6_mtu_set) {
3839 r = link_set_ipv6_mtu(link);
3840 if (r < 0)
3841 return r;
3842 }
3843
3844 return 0;
3845 }
3846
3847 int link_update(Link *link, sd_netlink_message *m) {
3848 _cleanup_strv_free_ char **s = NULL;
3849 struct ether_addr mac;
3850 const char *ifname;
3851 uint32_t mtu;
3852 bool had_carrier, carrier_gained, carrier_lost, link_was_admin_up;
3853 int old_master, r;
3854
3855 assert(link);
3856 assert(link->ifname);
3857 assert(m);
3858
3859 if (link->state == LINK_STATE_LINGER) {
3860 log_link_info(link, "Link re-added");
3861 link_set_state(link, LINK_STATE_CONFIGURING);
3862
3863 r = link_new_carrier_maps(link);
3864 if (r < 0)
3865 return r;
3866 }
3867
3868 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3869 if (r >= 0 && !streq(ifname, link->ifname)) {
3870 Manager *manager = link->manager;
3871
3872 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3873
3874 link_drop(link);
3875 r = link_add(manager, m, &link);
3876 if (r < 0)
3877 return r;
3878 }
3879
3880 r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3881 if (r >= 0)
3882 strv_free_and_replace(link->alternative_names, s);
3883
3884 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3885 if (r >= 0 && mtu > 0) {
3886 link->mtu = mtu;
3887 if (link->original_mtu == 0) {
3888 link->original_mtu = mtu;
3889 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3890 }
3891
3892 if (link->dhcp_client) {
3893 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3894 link->mtu);
3895 if (r < 0)
3896 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3897 }
3898
3899 if (link->radv) {
3900 r = sd_radv_set_mtu(link->radv, link->mtu);
3901 if (r < 0)
3902 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3903 }
3904 }
3905
3906 /* The kernel may broadcast NEWLINK messages without the MAC address
3907 set, simply ignore them. */
3908 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3909 if (r >= 0) {
3910 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3911 ETH_ALEN)) {
3912
3913 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3914 ETH_ALEN);
3915
3916 log_link_debug(link, "MAC address: "
3917 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3918 mac.ether_addr_octet[0],
3919 mac.ether_addr_octet[1],
3920 mac.ether_addr_octet[2],
3921 mac.ether_addr_octet[3],
3922 mac.ether_addr_octet[4],
3923 mac.ether_addr_octet[5]);
3924
3925 if (link->ipv4ll) {
3926 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3927 if (r < 0)
3928 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3929 }
3930
3931 if (link->dhcp_client) {
3932 r = sd_dhcp_client_set_mac(link->dhcp_client,
3933 (const uint8_t *) &link->mac,
3934 sizeof (link->mac),
3935 ARPHRD_ETHER);
3936 if (r < 0)
3937 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3938
3939 r = dhcp4_set_client_identifier(link);
3940 if (r < 0)
3941 return r;
3942 }
3943
3944 if (link->dhcp6_client) {
3945 const DUID* duid = link_get_duid(link);
3946
3947 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3948 (const uint8_t *) &link->mac,
3949 sizeof (link->mac),
3950 ARPHRD_ETHER);
3951 if (r < 0)
3952 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3953
3954 if (link->network->iaid_set) {
3955 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3956 link->network->iaid);
3957 if (r < 0)
3958 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3959 }
3960
3961 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3962 duid->type,
3963 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3964 duid->raw_data_len);
3965 if (r < 0)
3966 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3967 }
3968
3969 if (link->radv) {
3970 r = sd_radv_set_mac(link->radv, &link->mac);
3971 if (r < 0)
3972 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3973 }
3974
3975 if (link->ndisc) {
3976 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3977 if (r < 0)
3978 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3979 }
3980 }
3981 }
3982
3983 old_master = link->master_ifindex;
3984 (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
3985
3986 link_was_admin_up = link->flags & IFF_UP;
3987 had_carrier = link_has_carrier(link);
3988
3989 r = link_update_flags(link, m, old_master != link->master_ifindex);
3990 if (r < 0)
3991 return r;
3992
3993 if (!link_was_admin_up && (link->flags & IFF_UP)) {
3994 log_link_info(link, "Link UP");
3995
3996 r = link_admin_state_up(link);
3997 if (r < 0)
3998 return r;
3999 } else if (link_was_admin_up && !(link->flags & IFF_UP))
4000 log_link_info(link, "Link DOWN");
4001
4002 r = link_update_lldp(link);
4003 if (r < 0)
4004 return r;
4005
4006 carrier_gained = !had_carrier && link_has_carrier(link);
4007 carrier_lost = had_carrier && !link_has_carrier(link);
4008
4009 if (carrier_gained) {
4010 log_link_info(link, "Gained carrier");
4011
4012 r = link_carrier_gained(link);
4013 if (r < 0)
4014 return r;
4015 } else if (carrier_lost) {
4016 log_link_info(link, "Lost carrier");
4017
4018 r = link_carrier_lost(link);
4019 if (r < 0)
4020 return r;
4021 }
4022
4023 return 0;
4024 }
4025
4026 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
4027 bool space = false;
4028 Iterator i;
4029 Link *link;
4030
4031 assert(f);
4032 assert(prefix);
4033
4034 if (hashmap_isempty(h))
4035 return;
4036
4037 fputs(prefix, f);
4038 HASHMAP_FOREACH(link, h, i) {
4039 if (space)
4040 fputc(' ', f);
4041
4042 fprintf(f, "%i", link->ifindex);
4043 space = true;
4044 }
4045
4046 fputc('\n', f);
4047 }
4048
4049 static void link_save_dns(FILE *f, struct in_addr_data *dns, unsigned n_dns, bool *space) {
4050 for (unsigned j = 0; j < n_dns; j++) {
4051 _cleanup_free_ char *b = NULL;
4052 int r;
4053
4054 r = in_addr_to_string(dns[j].family, &dns[j].address, &b);
4055 if (r < 0) {
4056 log_debug_errno(r, "Failed to format address, ignoring: %m");
4057 continue;
4058 }
4059
4060 if (*space)
4061 fputc(' ', f);
4062 fputs(b, f);
4063 *space = true;
4064 }
4065 }
4066
4067 static void serialize_addresses(
4068 FILE *f,
4069 const char *lvalue,
4070 bool *space,
4071 char **addresses,
4072 sd_dhcp_lease *lease,
4073 bool conditional,
4074 sd_dhcp_lease_server_type what,
4075 sd_dhcp6_lease *lease6,
4076 bool conditional6,
4077 int (*lease6_get_addr)(sd_dhcp6_lease*, const struct in6_addr**),
4078 int (*lease6_get_fqdn)(sd_dhcp6_lease*, char ***)) {
4079 int r;
4080
4081 bool _space = false;
4082 if (!space)
4083 space = &_space;
4084
4085 if (lvalue)
4086 fprintf(f, "%s=", lvalue);
4087 fputstrv(f, addresses, NULL, space);
4088
4089 if (lease && conditional) {
4090 const struct in_addr *lease_addresses;
4091
4092 r = sd_dhcp_lease_get_servers(lease, what, &lease_addresses);
4093 if (r > 0)
4094 serialize_in_addrs(f, lease_addresses, r, space, in4_addr_is_non_local);
4095 }
4096
4097 if (lease6 && conditional6 && lease6_get_addr) {
4098 const struct in6_addr *in6_addrs;
4099
4100 r = lease6_get_addr(lease6, &in6_addrs);
4101 if (r > 0)
4102 serialize_in6_addrs(f, in6_addrs, r, space);
4103 }
4104
4105 if (lease6 && conditional6 && lease6_get_fqdn) {
4106 char **in6_hosts;
4107
4108 r = lease6_get_fqdn(lease6, &in6_hosts);
4109 if (r > 0)
4110 fputstrv(f, in6_hosts, NULL, space);
4111 }
4112
4113 if (lvalue)
4114 fputc('\n', f);
4115 }
4116
4117 int link_save(Link *link) {
4118 const char *admin_state, *oper_state, *carrier_state, *address_state;
4119 _cleanup_free_ char *temp_path = NULL;
4120 _cleanup_fclose_ FILE *f = NULL;
4121 Route *route;
4122 Address *a;
4123 Iterator i;
4124 int r;
4125
4126 assert(link);
4127 assert(link->state_file);
4128 assert(link->lease_file);
4129 assert(link->manager);
4130
4131 if (link->state == LINK_STATE_LINGER) {
4132 (void) unlink(link->state_file);
4133 return 0;
4134 }
4135
4136 link_lldp_save(link);
4137
4138 admin_state = link_state_to_string(link->state);
4139 assert(admin_state);
4140
4141 oper_state = link_operstate_to_string(link->operstate);
4142 assert(oper_state);
4143
4144 carrier_state = link_carrier_state_to_string(link->carrier_state);
4145 assert(carrier_state);
4146
4147 address_state = link_address_state_to_string(link->address_state);
4148 assert(address_state);
4149
4150 r = fopen_temporary(link->state_file, &f, &temp_path);
4151 if (r < 0)
4152 goto fail;
4153
4154 (void) fchmod(fileno(f), 0644);
4155
4156 fprintf(f,
4157 "# This is private data. Do not parse.\n"
4158 "ADMIN_STATE=%s\n"
4159 "OPER_STATE=%s\n"
4160 "CARRIER_STATE=%s\n"
4161 "ADDRESS_STATE=%s\n",
4162 admin_state, oper_state, carrier_state, address_state);
4163
4164 if (link->network) {
4165 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
4166 const char *dhcp_domainname = NULL, *p;
4167 sd_dhcp6_lease *dhcp6_lease = NULL;
4168 bool space;
4169
4170 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4171 yes_no(link->network->required_for_online));
4172
4173 LinkOperationalStateRange st = link->network->required_operstate_for_online;
4174 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s%s%s\n",
4175 strempty(link_operstate_to_string(st.min)),
4176 st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? ":" : "",
4177 st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? strempty(link_operstate_to_string(st.max)) : "");
4178
4179 if (link->dhcp6_client) {
4180 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
4181 if (r < 0 && r != -ENOMSG)
4182 log_link_debug_errno(link, r, "Failed to get DHCPv6 lease: %m");
4183 }
4184
4185 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4186
4187 /************************************************************/
4188
4189 fputs("DNS=", f);
4190 space = false;
4191 if (link->n_dns != (unsigned) -1)
4192 link_save_dns(f, link->dns, link->n_dns, &space);
4193 else
4194 link_save_dns(f, link->network->dns, link->network->n_dns, &space);
4195
4196 serialize_addresses(f, NULL, &space,
4197 NULL,
4198 link->dhcp_lease,
4199 link->network->dhcp_use_dns,
4200 SD_DHCP_LEASE_DNS,
4201 dhcp6_lease,
4202 link->network->dhcp6_use_dns,
4203 sd_dhcp6_lease_get_dns,
4204 NULL);
4205
4206 /* Make sure to flush out old entries before we use the NDISC data */
4207 ndisc_vacuum(link);
4208
4209 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4210 NDiscRDNSS *dd;
4211
4212 SET_FOREACH(dd, link->ndisc_rdnss, i)
4213 serialize_in6_addrs(f, &dd->address, 1, &space);
4214 }
4215
4216 fputc('\n', f);
4217
4218 /************************************************************/
4219
4220 serialize_addresses(f, "NTP", NULL,
4221 link->ntp ?: link->network->ntp,
4222 link->dhcp_lease,
4223 link->network->dhcp_use_ntp,
4224 SD_DHCP_LEASE_NTP,
4225 dhcp6_lease,
4226 link->network->dhcp6_use_ntp,
4227 sd_dhcp6_lease_get_ntp_addrs,
4228 sd_dhcp6_lease_get_ntp_fqdn);
4229
4230 serialize_addresses(f, "SIP", NULL,
4231 NULL,
4232 link->dhcp_lease,
4233 link->network->dhcp_use_sip,
4234 SD_DHCP_LEASE_SIP,
4235 NULL, false, NULL, NULL);
4236
4237 /************************************************************/
4238
4239 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4240 if (link->dhcp_lease) {
4241 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4242 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4243 }
4244 if (dhcp6_lease)
4245 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4246 }
4247
4248 fputs("DOMAINS=", f);
4249 space = false;
4250 ORDERED_SET_FOREACH(p, link->search_domains ?: link->network->search_domains, i)
4251 fputs_with_space(f, p, NULL, &space);
4252
4253 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4254 if (dhcp_domainname)
4255 fputs_with_space(f, dhcp_domainname, NULL, &space);
4256 if (dhcp_domains)
4257 fputstrv(f, dhcp_domains, NULL, &space);
4258 if (dhcp6_domains)
4259 fputstrv(f, dhcp6_domains, NULL, &space);
4260 }
4261
4262 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_YES) {
4263 NDiscDNSSL *dd;
4264
4265 SET_FOREACH(dd, link->ndisc_dnssl, i)
4266 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4267 }
4268
4269 fputc('\n', f);
4270
4271 /************************************************************/
4272
4273 fputs("ROUTE_DOMAINS=", f);
4274 space = false;
4275 ORDERED_SET_FOREACH(p, link->route_domains ?: link->network->route_domains, i)
4276 fputs_with_space(f, p, NULL, &space);
4277
4278 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4279 if (dhcp_domainname)
4280 fputs_with_space(f, dhcp_domainname, NULL, &space);
4281 if (dhcp_domains)
4282 fputstrv(f, dhcp_domains, NULL, &space);
4283 if (dhcp6_domains)
4284 fputstrv(f, dhcp6_domains, NULL, &space);
4285 }
4286
4287 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4288 NDiscDNSSL *dd;
4289
4290 SET_FOREACH(dd, link->ndisc_dnssl, i)
4291 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4292 }
4293
4294 fputc('\n', f);
4295
4296 /************************************************************/
4297
4298 fprintf(f, "LLMNR=%s\n",
4299 resolve_support_to_string(link->llmnr >= 0 ? link->llmnr : link->network->llmnr));
4300
4301 /************************************************************/
4302
4303 fprintf(f, "MDNS=%s\n",
4304 resolve_support_to_string(link->mdns >= 0 ? link->mdns : link->network->mdns));
4305
4306 /************************************************************/
4307
4308 int dns_default_route =
4309 link->dns_default_route >= 0 ? link->dns_default_route :
4310 link->network->dns_default_route;
4311 if (dns_default_route >= 0)
4312 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(dns_default_route));
4313
4314 /************************************************************/
4315
4316 DnsOverTlsMode dns_over_tls_mode =
4317 link->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID ? link->dns_over_tls_mode :
4318 link->network->dns_over_tls_mode;
4319 if (dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4320 fprintf(f, "DNS_OVER_TLS=%s\n", dns_over_tls_mode_to_string(dns_over_tls_mode));
4321
4322 /************************************************************/
4323
4324 DnssecMode dnssec_mode =
4325 link->dnssec_mode != _DNSSEC_MODE_INVALID ? link->dnssec_mode :
4326 link->network->dnssec_mode;
4327 if (dnssec_mode != _DNSSEC_MODE_INVALID)
4328 fprintf(f, "DNSSEC=%s\n", dnssec_mode_to_string(dnssec_mode));
4329
4330 /************************************************************/
4331
4332 Set *nta_anchors = link->dnssec_negative_trust_anchors;
4333 if (set_isempty(nta_anchors))
4334 nta_anchors = link->network->dnssec_negative_trust_anchors;
4335
4336 if (!set_isempty(nta_anchors)) {
4337 const char *n;
4338
4339 fputs("DNSSEC_NTA=", f);
4340 space = false;
4341 SET_FOREACH(n, nta_anchors, i)
4342 fputs_with_space(f, n, NULL, &space);
4343 fputc('\n', f);
4344 }
4345
4346 /************************************************************/
4347
4348 fputs("ADDRESSES=", f);
4349 space = false;
4350 SET_FOREACH(a, link->addresses, i) {
4351 _cleanup_free_ char *address_str = NULL;
4352
4353 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4354 if (r < 0)
4355 goto fail;
4356
4357 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4358 space = true;
4359 }
4360 fputc('\n', f);
4361
4362 /************************************************************/
4363
4364 fputs("ROUTES=", f);
4365 space = false;
4366 SET_FOREACH(route, link->routes, i) {
4367 _cleanup_free_ char *route_str = NULL;
4368
4369 r = in_addr_to_string(route->family, &route->dst, &route_str);
4370 if (r < 0)
4371 goto fail;
4372
4373 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4374 space ? " " : "", route_str,
4375 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4376 space = true;
4377 }
4378
4379 fputc('\n', f);
4380 }
4381
4382 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4383 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4384
4385 if (link->dhcp_lease) {
4386 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4387 if (r < 0)
4388 goto fail;
4389
4390 fprintf(f,
4391 "DHCP_LEASE=%s\n",
4392 link->lease_file);
4393 } else
4394 (void) unlink(link->lease_file);
4395
4396 if (link->ipv4ll) {
4397 struct in_addr address;
4398
4399 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4400 if (r >= 0) {
4401 fputs("IPV4LL_ADDRESS=", f);
4402 serialize_in_addrs(f, &address, 1, false, NULL);
4403 fputc('\n', f);
4404 }
4405 }
4406
4407 if (link->dhcp6_client) {
4408 _cleanup_free_ char *duid = NULL;
4409 uint32_t iaid;
4410
4411 r = sd_dhcp6_client_get_iaid(link->dhcp6_client, &iaid);
4412 if (r >= 0)
4413 fprintf(f, "DHCP6_CLIENT_IAID=0x%x\n", iaid);
4414
4415 r = sd_dhcp6_client_duid_as_string(link->dhcp6_client, &duid);
4416 if (r >= 0)
4417 fprintf(f, "DHCP6_CLIENT_DUID=%s\n", duid);
4418 }
4419
4420 r = fflush_and_check(f);
4421 if (r < 0)
4422 goto fail;
4423
4424 if (rename(temp_path, link->state_file) < 0) {
4425 r = -errno;
4426 goto fail;
4427 }
4428
4429 return 0;
4430
4431 fail:
4432 (void) unlink(link->state_file);
4433 if (temp_path)
4434 (void) unlink(temp_path);
4435
4436 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4437 }
4438
4439 /* The serialized state in /run is no longer up-to-date. */
4440 void link_dirty(Link *link) {
4441 int r;
4442
4443 assert(link);
4444
4445 /* mark manager dirty as link is dirty */
4446 manager_dirty(link->manager);
4447
4448 r = set_ensure_put(&link->manager->dirty_links, NULL, link);
4449 if (r <= 0)
4450 /* Ignore allocation errors and don't take another ref if the link was already dirty */
4451 return;
4452 link_ref(link);
4453 }
4454
4455 /* The serialized state in /run is up-to-date */
4456 void link_clean(Link *link) {
4457 assert(link);
4458 assert(link->manager);
4459
4460 link_unref(set_remove(link->manager->dirty_links, link));
4461 }
4462
4463 static const char* const link_state_table[_LINK_STATE_MAX] = {
4464 [LINK_STATE_PENDING] = "pending",
4465 [LINK_STATE_INITIALIZED] = "initialized",
4466 [LINK_STATE_CONFIGURING] = "configuring",
4467 [LINK_STATE_CONFIGURED] = "configured",
4468 [LINK_STATE_UNMANAGED] = "unmanaged",
4469 [LINK_STATE_FAILED] = "failed",
4470 [LINK_STATE_LINGER] = "linger",
4471 };
4472
4473 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
4474
4475 int log_link_message_full_errno(Link *link, sd_netlink_message *m, int level, int err, const char *msg) {
4476 const char *err_msg = NULL;
4477
4478 (void) sd_netlink_message_read_string(m, NLMSGERR_ATTR_MSG, &err_msg);
4479 return log_link_full(link, level, err,
4480 "%s: %s%s%s%m",
4481 msg,
4482 strempty(err_msg),
4483 err_msg && !endswith(err_msg, ".") ? "." : "",
4484 err_msg ? " " : "");
4485 }
Unnamed repository; edit this file 'description' to name the repository.