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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 static 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 log_link_debug(link, "%s(): link is in failed or linger state.", __func__);
1090 return;
1091 }
1092
1093 if (!link->network)
1094 return;
1095
1096 if (!link->addresses_configured) {
1097 log_link_debug(link, "%s(): static addresses are not configured.", __func__);
1098 return;
1099 }
1100
1101 if (!link->neighbors_configured) {
1102 log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
1103 return;
1104 }
1105
1106 SET_FOREACH(a, link->addresses, i)
1107 if (!address_is_ready(a)) {
1108 _cleanup_free_ char *str = NULL;
1109
1110 (void) in_addr_to_string(a->family, &a->in_addr, &str);
1111 log_link_debug(link, "%s(): an address %s/%d is not ready.", __func__, strnull(str), a->prefixlen);
1112 return;
1113 }
1114
1115 if (!link->addresses_ready) {
1116 link->addresses_ready = true;
1117 r = link_request_set_routes(link);
1118 if (r < 0)
1119 link_enter_failed(link);
1120 log_link_debug(link, "%s(): static addresses are configured. Configuring static routes.", __func__);
1121 return;
1122 }
1123
1124 if (!link->static_routes_configured) {
1125 log_link_debug(link, "%s(): static routes are not configured.", __func__);
1126 return;
1127 }
1128
1129 if (!link->static_routes_ready) {
1130 link->static_routes_ready = true;
1131 r = link_request_set_nexthop(link);
1132 if (r < 0)
1133 link_enter_failed(link);
1134 log_link_debug(link, "%s(): static routes are configured. Configuring static nexthops.", __func__);
1135 return;
1136 }
1137
1138 if (!link->static_nexthops_configured) {
1139 log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
1140 return;
1141 }
1142
1143 if (!link->routing_policy_rules_configured) {
1144 log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
1145 return;
1146 }
1147
1148 if (!link->tc_configured) {
1149 log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
1150 return;
1151 }
1152
1153 if (!link->sr_iov_configured) {
1154 log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
1155 return;
1156 }
1157
1158 if (link_has_carrier(link) || !link->network->configure_without_carrier) {
1159
1160 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !link->ipv4ll_address) {
1161 log_link_debug(link, "%s(): IPv4LL is not configured.", __func__);
1162 return;
1163 }
1164
1165 if (link_ipv6ll_enabled(link) &&
1166 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1167 log_link_debug(link, "%s(): IPv6LL is not configured.", __func__);
1168 return;
1169 }
1170
1171 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) && set_isempty(link->addresses)) {
1172 log_link_debug(link, "%s(): DHCP4 or DHCP6 is enabled but no address is assigned yet.", __func__);
1173 return;
1174 }
1175
1176 if (link_dhcp4_enabled(link) || link_dhcp6_enabled(link) || dhcp6_get_prefix_delegation(link) || link_ipv6_accept_ra_enabled(link)) {
1177 if (!link->dhcp4_configured &&
1178 !(link->dhcp6_address_configured && link->dhcp6_route_configured) &&
1179 !(link->dhcp6_pd_address_configured && link->dhcp6_pd_route_configured) &&
1180 !(link->ndisc_addresses_configured && link->ndisc_routes_configured) &&
1181 !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address)) {
1182 /* When DHCP or RA is enabled, at least one protocol must provide an address, or
1183 * an IPv4ll fallback address must be configured. */
1184 log_link_debug(link, "%s(): dynamic addresses or routes are not configured.", __func__);
1185 return;
1186 }
1187
1188 log_link_debug(link, "%s(): dhcp4:%s dhcp6_addresses:%s dhcp_routes:%s dhcp_pd_addresses:%s dhcp_pd_routes:%s ndisc_addresses:%s ndisc_routes:%s",
1189 __func__,
1190 yes_no(link->dhcp4_configured),
1191 yes_no(link->dhcp6_address_configured),
1192 yes_no(link->dhcp6_route_configured),
1193 yes_no(link->dhcp6_pd_address_configured),
1194 yes_no(link->dhcp6_pd_route_configured),
1195 yes_no(link->ndisc_addresses_configured),
1196 yes_no(link->ndisc_routes_configured));
1197 }
1198 }
1199
1200 if (link->state != LINK_STATE_CONFIGURED)
1201 link_enter_configured(link);
1202
1203 return;
1204 }
1205
1206 static int link_request_set_neighbors(Link *link) {
1207 Neighbor *neighbor;
1208 int r;
1209
1210 assert(link);
1211 assert(link->network);
1212 assert(link->state != _LINK_STATE_INVALID);
1213
1214 link->neighbors_configured = false;
1215
1216 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1217 r = neighbor_configure(neighbor, link, NULL);
1218 if (r < 0)
1219 return log_link_warning_errno(link, r, "Could not set neighbor: %m");
1220 }
1221
1222 if (link->neighbor_messages == 0) {
1223 link->neighbors_configured = true;
1224 link_check_ready(link);
1225 } else {
1226 log_link_debug(link, "Setting neighbors");
1227 link_set_state(link, LINK_STATE_CONFIGURING);
1228 }
1229
1230 return 0;
1231 }
1232
1233 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1234 int r;
1235
1236 assert(rtnl);
1237 assert(m);
1238 assert(link);
1239 assert(link->ifname);
1240 assert(link->address_messages > 0);
1241 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1242 LINK_STATE_FAILED, LINK_STATE_LINGER));
1243
1244 link->address_messages--;
1245
1246 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1247 return 1;
1248
1249 r = sd_netlink_message_get_errno(m);
1250 if (r < 0 && r != -EEXIST) {
1251 log_link_message_warning_errno(link, m, r, "Could not set address");
1252 link_enter_failed(link);
1253 return 1;
1254 } else if (r >= 0)
1255 (void) manager_rtnl_process_address(rtnl, m, link->manager);
1256
1257 if (link->address_messages == 0) {
1258 log_link_debug(link, "Addresses set");
1259 link->addresses_configured = true;
1260 link_check_ready(link);
1261 }
1262
1263 return 1;
1264 }
1265
1266 static int link_set_bridge_fdb(Link *link) {
1267 FdbEntry *fdb_entry;
1268 int r;
1269
1270 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1271 r = fdb_entry_configure(link, fdb_entry);
1272 if (r < 0)
1273 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1274 }
1275
1276 return 0;
1277 }
1278
1279 static int link_request_set_addresses(Link *link) {
1280 AddressLabel *label;
1281 Address *ad;
1282 Prefix *p;
1283 int r;
1284
1285 assert(link);
1286 assert(link->network);
1287 assert(link->state != _LINK_STATE_INVALID);
1288
1289 /* Reset all *_configured flags we are configuring. */
1290 link->addresses_configured = false;
1291 link->addresses_ready = false;
1292 link->neighbors_configured = false;
1293 link->static_routes_configured = false;
1294 link->static_routes_ready = false;
1295 link->static_nexthops_configured = false;
1296 link->routing_policy_rules_configured = false;
1297
1298 r = link_set_bridge_fdb(link);
1299 if (r < 0)
1300 return r;
1301
1302 r = link_request_set_neighbors(link);
1303 if (r < 0)
1304 return r;
1305
1306 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1307 bool update;
1308
1309 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1310
1311 r = address_configure(ad, link, address_handler, update);
1312 if (r < 0)
1313 return log_link_warning_errno(link, r, "Could not set addresses: %m");
1314 if (r > 0)
1315 link->address_messages++;
1316 }
1317
1318 if (IN_SET(link->network->router_prefix_delegation,
1319 RADV_PREFIX_DELEGATION_STATIC,
1320 RADV_PREFIX_DELEGATION_BOTH))
1321 LIST_FOREACH(prefixes, p, link->network->static_prefixes) {
1322 _cleanup_(address_freep) Address *address = NULL;
1323
1324 if (!p->assign)
1325 continue;
1326
1327 r = address_new(&address);
1328 if (r < 0)
1329 return log_link_error_errno(link, r, "Could not allocate address: %m");
1330
1331 r = sd_radv_prefix_get_prefix(p->radv_prefix, &address->in_addr.in6, &address->prefixlen);
1332 if (r < 0)
1333 return r;
1334
1335 r = generate_ipv6_eui_64_address(link, &address->in_addr.in6);
1336 if (r < 0)
1337 return r;
1338
1339 address->family = AF_INET6;
1340 r = address_configure(address, link, address_handler, true);
1341 if (r < 0)
1342 return log_link_warning_errno(link, r, "Could not set addresses: %m");
1343 if (r > 0)
1344 link->address_messages++;
1345 }
1346
1347 LIST_FOREACH(labels, label, link->network->address_labels) {
1348 r = address_label_configure(label, link, NULL, false);
1349 if (r < 0)
1350 return log_link_warning_errno(link, r, "Could not set address label: %m");
1351
1352 link->address_label_messages++;
1353 }
1354
1355 /* now that we can figure out a default address for the dhcp server,
1356 start it */
1357 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1358 r = dhcp4_server_configure(link);
1359 if (r < 0)
1360 return r;
1361 log_link_debug(link, "Offering DHCPv4 leases");
1362 }
1363
1364 if (link->address_messages == 0) {
1365 link->addresses_configured = true;
1366 link_check_ready(link);
1367 } else {
1368 log_link_debug(link, "Setting addresses");
1369 link_set_state(link, LINK_STATE_CONFIGURING);
1370 }
1371
1372 return 0;
1373 }
1374
1375 static int link_set_bridge_vlan(Link *link) {
1376 int r;
1377
1378 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1379 if (r < 0)
1380 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1381
1382 return r;
1383 }
1384
1385 static int link_set_proxy_arp(Link *link) {
1386 int r;
1387
1388 if (!link_proxy_arp_enabled(link))
1389 return 0;
1390
1391 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1392 if (r < 0)
1393 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1394
1395 return 0;
1396 }
1397
1398 static int link_configure_continue(Link *link);
1399
1400 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1401 int r;
1402
1403 assert(m);
1404 assert(link);
1405 assert(link->ifname);
1406
1407 link->setting_mtu = false;
1408
1409 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1410 return 1;
1411
1412 r = sd_netlink_message_get_errno(m);
1413 if (r < 0)
1414 log_link_message_warning_errno(link, m, r, "Could not set MTU, ignoring");
1415 else
1416 log_link_debug(link, "Setting MTU done.");
1417
1418 if (link->state == LINK_STATE_INITIALIZED) {
1419 r = link_configure_continue(link);
1420 if (r < 0)
1421 link_enter_failed(link);
1422 }
1423
1424 return 1;
1425 }
1426
1427 int link_set_mtu(Link *link, uint32_t mtu) {
1428 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1429 int r;
1430
1431 assert(link);
1432 assert(link->manager);
1433 assert(link->manager->rtnl);
1434
1435 if (mtu == 0 || link->setting_mtu)
1436 return 0;
1437
1438 if (link->mtu == mtu)
1439 return 0;
1440
1441 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1442
1443 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1444 if (r < 0)
1445 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1446
1447 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1448 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1449 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1450
1451 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1452 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes");
1453
1454 mtu = IPV6_MIN_MTU;
1455 }
1456
1457 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1458 if (r < 0)
1459 return log_link_error_errno(link, r, "Could not append MTU: %m");
1460
1461 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1462 link_netlink_destroy_callback, link);
1463 if (r < 0)
1464 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1465
1466 link_ref(link);
1467 link->setting_mtu = true;
1468
1469 return 0;
1470 }
1471
1472 static bool link_reduces_vlan_mtu(Link *link) {
1473 /* See netif_reduces_vlan_mtu() in kernel. */
1474 return streq_ptr(link->kind, "macsec");
1475 }
1476
1477 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1478 uint32_t mtu = 0;
1479 NetDev *dev;
1480 Iterator i;
1481
1482 HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1483 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1484 /* See vlan_dev_change_mtu() in kernel. */
1485 mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1486
1487 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1488 /* See macvlan_change_mtu() in kernel. */
1489 mtu = dev->mtu;
1490
1491 return mtu;
1492 }
1493
1494 static int link_configure_mtu(Link *link) {
1495 uint32_t mtu;
1496
1497 assert(link);
1498 assert(link->network);
1499
1500 if (link->network->mtu > 0)
1501 return link_set_mtu(link, link->network->mtu);
1502
1503 mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1504 if (link->mtu >= mtu)
1505 return 0;
1506
1507 log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1508 "If it is not desired, then please explicitly specify MTUBytes= setting.",
1509 link->mtu, mtu);
1510
1511 return link_set_mtu(link, mtu);
1512 }
1513
1514 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1515 int r;
1516
1517 assert(m);
1518 assert(link);
1519 assert(link->ifname);
1520
1521 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1522 return 1;
1523
1524 r = sd_netlink_message_get_errno(m);
1525 if (r < 0)
1526 log_link_message_warning_errno(link, m, r, "Could not set link flags, ignoring");
1527
1528 return 1;
1529 }
1530
1531 static int link_set_flags(Link *link) {
1532 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1533 unsigned ifi_change = 0;
1534 unsigned ifi_flags = 0;
1535 int r;
1536
1537 assert(link);
1538 assert(link->manager);
1539 assert(link->manager->rtnl);
1540
1541 if (link->flags & IFF_LOOPBACK)
1542 return 0;
1543
1544 if (!link->network)
1545 return 0;
1546
1547 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1548 return 0;
1549
1550 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1551 if (r < 0)
1552 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1553
1554 if (link->network->arp >= 0) {
1555 ifi_change |= IFF_NOARP;
1556 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1557 }
1558
1559 if (link->network->multicast >= 0) {
1560 ifi_change |= IFF_MULTICAST;
1561 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1562 }
1563
1564 if (link->network->allmulticast >= 0) {
1565 ifi_change |= IFF_ALLMULTI;
1566 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1567 }
1568
1569 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1570 if (r < 0)
1571 return log_link_error_errno(link, r, "Could not set link flags: %m");
1572
1573 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1574 link_netlink_destroy_callback, link);
1575 if (r < 0)
1576 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1577
1578 link_ref(link);
1579
1580 return 0;
1581 }
1582
1583 static int link_acquire_ipv6_conf(Link *link) {
1584 int r;
1585
1586 assert(link);
1587
1588 if (link_ipv6_accept_ra_enabled(link)) {
1589 assert(link->ndisc);
1590
1591 log_link_debug(link, "Discovering IPv6 routers");
1592
1593 r = sd_ndisc_start(link->ndisc);
1594 if (r < 0 && r != -EBUSY)
1595 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1596 }
1597
1598 if (link_radv_enabled(link)) {
1599 assert(link->radv);
1600 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1601
1602 log_link_debug(link, "Starting IPv6 Router Advertisements");
1603
1604 r = radv_emit_dns(link);
1605 if (r < 0)
1606 return log_link_warning_errno(link, r, "Failed to configure DNS or Domains in IPv6 Router Advertisement: %m");
1607
1608 r = sd_radv_start(link->radv);
1609 if (r < 0 && r != -EBUSY)
1610 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1611 }
1612
1613 if (link_dhcp6_enabled(link) && IN_SET(link->network->dhcp6_without_ra,
1614 DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST,
1615 DHCP6_CLIENT_START_MODE_SOLICIT)) {
1616 assert(link->dhcp6_client);
1617 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1618
1619 r = dhcp6_request_address(link, link->network->dhcp6_without_ra == DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST);
1620 if (r < 0 && r != -EBUSY)
1621 return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m");
1622 else
1623 log_link_debug(link, "Acquiring DHCPv6 lease");
1624 }
1625
1626 (void) dhcp6_request_prefix_delegation(link);
1627
1628 return 0;
1629 }
1630
1631 static int link_acquire_ipv4_conf(Link *link) {
1632 int r;
1633
1634 assert(link);
1635 assert(link->manager);
1636 assert(link->manager->event);
1637
1638 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1639 assert(link->ipv4ll);
1640
1641 log_link_debug(link, "Acquiring IPv4 link-local address");
1642
1643 r = sd_ipv4ll_start(link->ipv4ll);
1644 if (r < 0)
1645 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1646 }
1647
1648 if (link_dhcp4_enabled(link)) {
1649 assert(link->dhcp_client);
1650
1651 log_link_debug(link, "Acquiring DHCPv4 lease");
1652
1653 r = sd_dhcp_client_start(link->dhcp_client);
1654 if (r < 0)
1655 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1656 }
1657
1658 return 0;
1659 }
1660
1661 static int link_acquire_conf(Link *link) {
1662 int r;
1663
1664 assert(link);
1665
1666 r = link_acquire_ipv4_conf(link);
1667 if (r < 0)
1668 return r;
1669
1670 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1671 r = link_acquire_ipv6_conf(link);
1672 if (r < 0)
1673 return r;
1674 }
1675
1676 if (link_lldp_emit_enabled(link)) {
1677 r = link_lldp_emit_start(link);
1678 if (r < 0)
1679 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1680 }
1681
1682 return 0;
1683 }
1684
1685 bool link_has_carrier(Link *link) {
1686 /* see Documentation/networking/operstates.txt in the kernel sources */
1687
1688 if (link->kernel_operstate == IF_OPER_UP)
1689 return true;
1690
1691 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1692 /* operstate may not be implemented, so fall back to flags */
1693 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1694 !FLAGS_SET(link->flags, IFF_DORMANT))
1695 return true;
1696
1697 return false;
1698 }
1699
1700 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1701 int r;
1702
1703 assert(link);
1704
1705 link->setting_genmode = false;
1706
1707 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1708 return 1;
1709
1710 r = sd_netlink_message_get_errno(m);
1711 if (r < 0)
1712 log_link_message_warning_errno(link, m, r, "Could not set address genmode for interface, ignoring");
1713 else
1714 log_link_debug(link, "Setting address genmode done.");
1715
1716 if (link->state == LINK_STATE_INITIALIZED) {
1717 r = link_configure_continue(link);
1718 if (r < 0)
1719 link_enter_failed(link);
1720 }
1721
1722 return 1;
1723 }
1724
1725 static int link_configure_addrgen_mode(Link *link) {
1726 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1727 uint8_t ipv6ll_mode;
1728 int r;
1729
1730 assert(link);
1731 assert(link->network);
1732 assert(link->manager);
1733 assert(link->manager->rtnl);
1734
1735 if (!socket_ipv6_is_supported() || link->setting_genmode)
1736 return 0;
1737
1738 log_link_debug(link, "Setting address genmode for link");
1739
1740 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1741 if (r < 0)
1742 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1743
1744 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1745 if (r < 0)
1746 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1747
1748 r = sd_netlink_message_open_container(req, AF_INET6);
1749 if (r < 0)
1750 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1751
1752 if (!link_ipv6ll_enabled(link))
1753 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1754 else if (link->network->ipv6ll_address_gen_mode < 0) {
1755 r = sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL);
1756 if (r < 0) {
1757 /* The file may not exist. And even if it exists, when stable_secret is unset,
1758 * reading the file fails with EIO. */
1759 log_link_debug_errno(link, r, "Failed to read sysctl property stable_secret: %m");
1760
1761 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1762 } else
1763 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1764 } else
1765 ipv6ll_mode = link->network->ipv6ll_address_gen_mode;
1766
1767 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1768 if (r < 0)
1769 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1770
1771 r = sd_netlink_message_close_container(req);
1772 if (r < 0)
1773 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1774
1775 r = sd_netlink_message_close_container(req);
1776 if (r < 0)
1777 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1778
1779 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1780 link_netlink_destroy_callback, link);
1781 if (r < 0)
1782 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1783
1784 link_ref(link);
1785 link->setting_genmode = true;
1786
1787 return 0;
1788 }
1789
1790 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1791 int r;
1792
1793 assert(link);
1794
1795 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1796 return 1;
1797
1798 r = sd_netlink_message_get_errno(m);
1799 if (r < 0)
1800 /* we warn but don't fail the link, as it may be brought up later */
1801 log_link_message_warning_errno(link, m, r, "Could not bring up interface");
1802
1803 return 1;
1804 }
1805
1806 static int link_up(Link *link) {
1807 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1808 int r;
1809
1810 assert(link);
1811 assert(link->network);
1812 assert(link->manager);
1813 assert(link->manager->rtnl);
1814
1815 log_link_debug(link, "Bringing link up");
1816
1817 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1818 if (r < 0)
1819 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1820
1821 /* set it free if not enslaved with networkd */
1822 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1823 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1824 if (r < 0)
1825 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1826 }
1827
1828 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1829 if (r < 0)
1830 return log_link_error_errno(link, r, "Could not set link flags: %m");
1831
1832 if (link->network->mac) {
1833 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1834 if (r < 0)
1835 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1836 }
1837
1838 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1839 link_netlink_destroy_callback, link);
1840 if (r < 0)
1841 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1842
1843 link_ref(link);
1844
1845 return 0;
1846 }
1847
1848 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1849 int r;
1850
1851 assert(link);
1852
1853 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1854 return 1;
1855
1856 r = sd_netlink_message_get_errno(m);
1857 if (r < 0)
1858 log_link_message_warning_errno(link, m, r, "Could not bring down interface");
1859
1860 return 1;
1861 }
1862
1863 int link_down(Link *link, link_netlink_message_handler_t callback) {
1864 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1865 int r;
1866
1867 assert(link);
1868 assert(link->manager);
1869 assert(link->manager->rtnl);
1870
1871 log_link_debug(link, "Bringing link down");
1872
1873 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1874 RTM_SETLINK, link->ifindex);
1875 if (r < 0)
1876 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1877
1878 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1879 if (r < 0)
1880 return log_link_error_errno(link, r, "Could not set link flags: %m");
1881
1882 r = netlink_call_async(link->manager->rtnl, NULL, req,
1883 callback ?: link_down_handler,
1884 link_netlink_destroy_callback, link);
1885 if (r < 0)
1886 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1887
1888 link_ref(link);
1889
1890 return 0;
1891 }
1892
1893 static int link_group_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1894 int r;
1895
1896 assert(link);
1897
1898 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1899 return 1;
1900
1901 r = sd_netlink_message_get_errno(m);
1902 if (r < 0)
1903 log_link_message_warning_errno(link, m, r, "Could not set group for the interface");
1904
1905 return 1;
1906 }
1907
1908 static int link_set_group(Link *link) {
1909 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1910 int r;
1911
1912 assert(link);
1913 assert(link->network);
1914 assert(link->manager);
1915 assert(link->manager->rtnl);
1916
1917 if (link->network->group <= 0)
1918 return 0;
1919
1920 log_link_debug(link, "Setting group");
1921
1922 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1923 if (r < 0)
1924 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1925
1926 r = sd_netlink_message_append_u32(req, IFLA_GROUP, link->network->group);
1927 if (r < 0)
1928 return log_link_error_errno(link, r, "Could not set link group: %m");
1929
1930 r = netlink_call_async(link->manager->rtnl, NULL, req, link_group_handler,
1931 link_netlink_destroy_callback, link);
1932 if (r < 0)
1933 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1934
1935 link_ref(link);
1936
1937 return 0;
1938 }
1939
1940 static int link_handle_bound_to_list(Link *link) {
1941 Link *l;
1942 Iterator i;
1943 int r;
1944 bool required_up = false;
1945 bool link_is_up = false;
1946
1947 assert(link);
1948
1949 if (hashmap_isempty(link->bound_to_links))
1950 return 0;
1951
1952 if (link->flags & IFF_UP)
1953 link_is_up = true;
1954
1955 HASHMAP_FOREACH (l, link->bound_to_links, i)
1956 if (link_has_carrier(l)) {
1957 required_up = true;
1958 break;
1959 }
1960
1961 if (!required_up && link_is_up) {
1962 r = link_down(link, NULL);
1963 if (r < 0)
1964 return r;
1965 } else if (required_up && !link_is_up) {
1966 r = link_up(link);
1967 if (r < 0)
1968 return r;
1969 }
1970
1971 return 0;
1972 }
1973
1974 static int link_handle_bound_by_list(Link *link) {
1975 Iterator i;
1976 Link *l;
1977 int r;
1978
1979 assert(link);
1980
1981 if (hashmap_isempty(link->bound_by_links))
1982 return 0;
1983
1984 HASHMAP_FOREACH (l, link->bound_by_links, i) {
1985 r = link_handle_bound_to_list(l);
1986 if (r < 0)
1987 return r;
1988 }
1989
1990 return 0;
1991 }
1992
1993 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1994 int r;
1995
1996 assert(link);
1997 assert(carrier);
1998
1999 if (link == carrier)
2000 return 0;
2001
2002 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2003 return 0;
2004
2005 r = hashmap_ensure_allocated(h, NULL);
2006 if (r < 0)
2007 return r;
2008
2009 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2010 if (r < 0)
2011 return r;
2012
2013 return 0;
2014 }
2015
2016 static int link_new_bound_by_list(Link *link) {
2017 Manager *m;
2018 Link *carrier;
2019 Iterator i;
2020 int r;
2021 bool list_updated = false;
2022
2023 assert(link);
2024 assert(link->manager);
2025
2026 m = link->manager;
2027
2028 HASHMAP_FOREACH(carrier, m->links, i) {
2029 if (!carrier->network)
2030 continue;
2031
2032 if (strv_isempty(carrier->network->bind_carrier))
2033 continue;
2034
2035 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
2036 r = link_put_carrier(link, carrier, &link->bound_by_links);
2037 if (r < 0)
2038 return r;
2039
2040 list_updated = true;
2041 }
2042 }
2043
2044 if (list_updated)
2045 link_dirty(link);
2046
2047 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2048 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2049 if (r < 0)
2050 return r;
2051
2052 link_dirty(carrier);
2053 }
2054
2055 return 0;
2056 }
2057
2058 static int link_new_bound_to_list(Link *link) {
2059 Manager *m;
2060 Link *carrier;
2061 Iterator i;
2062 int r;
2063 bool list_updated = false;
2064
2065 assert(link);
2066 assert(link->manager);
2067
2068 if (!link->network)
2069 return 0;
2070
2071 if (strv_isempty(link->network->bind_carrier))
2072 return 0;
2073
2074 m = link->manager;
2075
2076 HASHMAP_FOREACH (carrier, m->links, i) {
2077 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
2078 r = link_put_carrier(link, carrier, &link->bound_to_links);
2079 if (r < 0)
2080 return r;
2081
2082 list_updated = true;
2083 }
2084 }
2085
2086 if (list_updated)
2087 link_dirty(link);
2088
2089 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2090 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2091 if (r < 0)
2092 return r;
2093
2094 link_dirty(carrier);
2095 }
2096
2097 return 0;
2098 }
2099
2100 static int link_new_carrier_maps(Link *link) {
2101 int r;
2102
2103 r = link_new_bound_by_list(link);
2104 if (r < 0)
2105 return r;
2106
2107 r = link_handle_bound_by_list(link);
2108 if (r < 0)
2109 return r;
2110
2111 r = link_new_bound_to_list(link);
2112 if (r < 0)
2113 return r;
2114
2115 r = link_handle_bound_to_list(link);
2116 if (r < 0)
2117 return r;
2118
2119 return 0;
2120 }
2121
2122 static void link_free_bound_to_list(Link *link) {
2123 Link *bound_to;
2124 Iterator i;
2125
2126 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2127 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2128
2129 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2130 link_dirty(bound_to);
2131 }
2132
2133 return;
2134 }
2135
2136 static void link_free_bound_by_list(Link *link) {
2137 Link *bound_by;
2138 Iterator i;
2139
2140 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2141 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2142
2143 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2144 link_dirty(bound_by);
2145 link_handle_bound_to_list(bound_by);
2146 }
2147 }
2148
2149 return;
2150 }
2151
2152 static void link_free_carrier_maps(Link *link) {
2153 bool list_updated = false;
2154
2155 assert(link);
2156
2157 if (!hashmap_isempty(link->bound_to_links)) {
2158 link_free_bound_to_list(link);
2159 list_updated = true;
2160 }
2161
2162 if (!hashmap_isempty(link->bound_by_links)) {
2163 link_free_bound_by_list(link);
2164 list_updated = true;
2165 }
2166
2167 if (list_updated)
2168 link_dirty(link);
2169
2170 return;
2171 }
2172
2173 static int link_append_to_master(Link *link, NetDev *netdev) {
2174 Link *master;
2175 int r;
2176
2177 assert(link);
2178 assert(netdev);
2179
2180 r = link_get(link->manager, netdev->ifindex, &master);
2181 if (r < 0)
2182 return r;
2183
2184 r = set_ensure_put(&master->slaves, NULL, link);
2185 if (r <= 0)
2186 return r;
2187
2188 link_ref(link);
2189 return 0;
2190 }
2191
2192 static void link_drop_from_master(Link *link, NetDev *netdev) {
2193 Link *master;
2194
2195 assert(link);
2196
2197 if (!link->manager || !netdev)
2198 return;
2199
2200 if (link_get(link->manager, netdev->ifindex, &master) < 0)
2201 return;
2202
2203 link_unref(set_remove(master->slaves, link));
2204 }
2205
2206 static void link_detach_from_manager(Link *link) {
2207 if (!link || !link->manager)
2208 return;
2209
2210 link_unref(set_remove(link->manager->links_requesting_uuid, link));
2211 link_clean(link);
2212
2213 /* The following must be called at last. */
2214 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2215 link_unref(link);
2216 }
2217
2218 void link_drop(Link *link) {
2219 if (!link || link->state == LINK_STATE_LINGER)
2220 return;
2221
2222 link_set_state(link, LINK_STATE_LINGER);
2223
2224 link_free_carrier_maps(link);
2225
2226 if (link->network) {
2227 link_drop_from_master(link, link->network->bridge);
2228 link_drop_from_master(link, link->network->bond);
2229 }
2230
2231 log_link_debug(link, "Link removed");
2232
2233 (void) unlink(link->state_file);
2234 link_detach_from_manager(link);
2235 }
2236
2237 static int link_joined(Link *link) {
2238 int r;
2239
2240 assert(link);
2241 assert(link->network);
2242
2243 if (!hashmap_isempty(link->bound_to_links)) {
2244 r = link_handle_bound_to_list(link);
2245 if (r < 0)
2246 return r;
2247 } else if (!(link->flags & IFF_UP)) {
2248 r = link_up(link);
2249 if (r < 0) {
2250 link_enter_failed(link);
2251 return r;
2252 }
2253 }
2254
2255 if (link->network->bridge) {
2256 r = link_set_bridge(link);
2257 if (r < 0)
2258 log_link_error_errno(link, r, "Could not set bridge message: %m");
2259
2260 r = link_append_to_master(link, link->network->bridge);
2261 if (r < 0)
2262 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2263 }
2264
2265 if (link->network->bond) {
2266 r = link_set_bond(link);
2267 if (r < 0)
2268 log_link_error_errno(link, r, "Could not set bond message: %m");
2269
2270 r = link_append_to_master(link, link->network->bond);
2271 if (r < 0)
2272 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2273 }
2274
2275 if (link->network->use_br_vlan &&
2276 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2277 r = link_set_bridge_vlan(link);
2278 if (r < 0)
2279 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2280 }
2281
2282 /* Skip setting up addresses until it gets carrier,
2283 or it would try to set addresses twice,
2284 which is bad for non-idempotent steps. */
2285 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2286 return 0;
2287
2288 link_set_state(link, LINK_STATE_CONFIGURING);
2289 return link_request_set_addresses(link);
2290 }
2291
2292 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2293 int r;
2294
2295 assert(link);
2296 assert(link->network);
2297 assert(link->enslaving > 0);
2298
2299 link->enslaving--;
2300
2301 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2302 return 1;
2303
2304 r = sd_netlink_message_get_errno(m);
2305 if (r < 0 && r != -EEXIST) {
2306 log_link_message_warning_errno(link, m, r, "Could not join netdev");
2307 link_enter_failed(link);
2308 return 1;
2309 }
2310
2311 log_link_debug(link, "Joined netdev");
2312
2313 if (link->enslaving == 0) {
2314 r = link_joined(link);
2315 if (r < 0)
2316 link_enter_failed(link);
2317 }
2318
2319 return 1;
2320 }
2321
2322 static int link_enter_join_netdev(Link *link) {
2323 NetDev *netdev;
2324 Iterator i;
2325 int r;
2326
2327 assert(link);
2328 assert(link->network);
2329 assert(link->state == LINK_STATE_INITIALIZED);
2330
2331 link_set_state(link, LINK_STATE_CONFIGURING);
2332
2333 link_dirty(link);
2334 link->enslaving = 0;
2335
2336 if (link->network->bond) {
2337 if (link->network->bond->state == NETDEV_STATE_READY &&
2338 link->network->bond->ifindex == link->master_ifindex)
2339 return link_joined(link);
2340
2341 log_struct(LOG_DEBUG,
2342 LOG_LINK_INTERFACE(link),
2343 LOG_NETDEV_INTERFACE(link->network->bond),
2344 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2345
2346 link->enslaving++;
2347
2348 r = netdev_join(link->network->bond, link, netdev_join_handler);
2349 if (r < 0) {
2350 log_struct_errno(LOG_WARNING, r,
2351 LOG_LINK_INTERFACE(link),
2352 LOG_NETDEV_INTERFACE(link->network->bond),
2353 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2354 link_enter_failed(link);
2355 return r;
2356 }
2357 }
2358
2359 if (link->network->bridge) {
2360 log_struct(LOG_DEBUG,
2361 LOG_LINK_INTERFACE(link),
2362 LOG_NETDEV_INTERFACE(link->network->bridge),
2363 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2364
2365 link->enslaving++;
2366
2367 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2368 if (r < 0) {
2369 log_struct_errno(LOG_WARNING, r,
2370 LOG_LINK_INTERFACE(link),
2371 LOG_NETDEV_INTERFACE(link->network->bridge),
2372 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2373 link_enter_failed(link);
2374 return r;
2375 }
2376 }
2377
2378 if (link->network->vrf) {
2379 log_struct(LOG_DEBUG,
2380 LOG_LINK_INTERFACE(link),
2381 LOG_NETDEV_INTERFACE(link->network->vrf),
2382 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2383
2384 link->enslaving++;
2385
2386 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2387 if (r < 0) {
2388 log_struct_errno(LOG_WARNING, r,
2389 LOG_LINK_INTERFACE(link),
2390 LOG_NETDEV_INTERFACE(link->network->vrf),
2391 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2392 link_enter_failed(link);
2393 return r;
2394 }
2395 }
2396
2397 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2398
2399 if (netdev->ifindex > 0)
2400 /* Assume already enslaved. */
2401 continue;
2402
2403 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2404 continue;
2405
2406 log_struct(LOG_DEBUG,
2407 LOG_LINK_INTERFACE(link),
2408 LOG_NETDEV_INTERFACE(netdev),
2409 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2410
2411 link->enslaving++;
2412
2413 r = netdev_join(netdev, link, netdev_join_handler);
2414 if (r < 0) {
2415 log_struct_errno(LOG_WARNING, r,
2416 LOG_LINK_INTERFACE(link),
2417 LOG_NETDEV_INTERFACE(netdev),
2418 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2419 link_enter_failed(link);
2420 return r;
2421 }
2422 }
2423
2424 if (link->enslaving == 0)
2425 return link_joined(link);
2426
2427 return 0;
2428 }
2429
2430 static int link_set_ipv4_forward(Link *link) {
2431 int r;
2432
2433 if (!link_ipv4_forward_enabled(link))
2434 return 0;
2435
2436 /* We propagate the forwarding flag from one interface to the
2437 * global setting one way. This means: as long as at least one
2438 * interface was configured at any time that had IP forwarding
2439 * enabled the setting will stay on for good. We do this
2440 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2441 * somewhat in sync (see below). */
2442
2443 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2444 if (r < 0)
2445 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2446
2447 return 0;
2448 }
2449
2450 static int link_set_ipv6_forward(Link *link) {
2451 int r;
2452
2453 if (!link_ipv6_forward_enabled(link))
2454 return 0;
2455
2456 /* On Linux, the IPv6 stack does not know a per-interface
2457 * packet forwarding setting: either packet forwarding is on
2458 * for all, or off for all. We hence don't bother with a
2459 * per-interface setting, but simply propagate the interface
2460 * flag, if it is set, to the global flag, one-way. Note that
2461 * while IPv4 would allow a per-interface flag, we expose the
2462 * same behaviour there and also propagate the setting from
2463 * one to all, to keep things simple (see above). */
2464
2465 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2466 if (r < 0)
2467 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2468
2469 return 0;
2470 }
2471
2472 static int link_set_ipv6_privacy_extensions(Link *link) {
2473 IPv6PrivacyExtensions s;
2474 int r;
2475
2476 s = link_ipv6_privacy_extensions(link);
2477 if (s < 0)
2478 return 0;
2479
2480 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2481 if (r < 0)
2482 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2483
2484 return 0;
2485 }
2486
2487 static int link_set_ipv6_accept_ra(Link *link) {
2488 int r;
2489
2490 /* Make this a NOP if IPv6 is not available */
2491 if (!socket_ipv6_is_supported())
2492 return 0;
2493
2494 if (link->flags & IFF_LOOPBACK)
2495 return 0;
2496
2497 if (!link->network)
2498 return 0;
2499
2500 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2501 if (r < 0)
2502 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2503
2504 return 0;
2505 }
2506
2507 static int link_set_ipv6_dad_transmits(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)
2518 return 0;
2519
2520 if (link->network->ipv6_dad_transmits < 0)
2521 return 0;
2522
2523 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2524 if (r < 0)
2525 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2526
2527 return 0;
2528 }
2529
2530 static int link_set_ipv6_hop_limit(Link *link) {
2531 int r;
2532
2533 /* Make this a NOP if IPv6 is not available */
2534 if (!socket_ipv6_is_supported())
2535 return 0;
2536
2537 if (link->flags & IFF_LOOPBACK)
2538 return 0;
2539
2540 if (!link->network)
2541 return 0;
2542
2543 if (link->network->ipv6_hop_limit < 0)
2544 return 0;
2545
2546 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2547 if (r < 0)
2548 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2549
2550 return 0;
2551 }
2552
2553 static int link_set_ipv6_mtu(Link *link) {
2554 int r;
2555
2556 /* Make this a NOP if IPv6 is not available */
2557 if (!socket_ipv6_is_supported())
2558 return 0;
2559
2560 if (link->flags & IFF_LOOPBACK)
2561 return 0;
2562
2563 if (link->network->ipv6_mtu == 0)
2564 return 0;
2565
2566 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
2567 * on the interface. Bump up IPv6 MTU bytes to IPV6_MTU_MIN. */
2568 if (link->network->ipv6_mtu < IPV6_MIN_MTU) {
2569 log_link_notice(link, "Bumping IPv6 MTU to "STRINGIFY(IPV6_MIN_MTU)" byte minimum required");
2570 link->network->ipv6_mtu = IPV6_MIN_MTU;
2571 }
2572
2573 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2574 if (r < 0) {
2575 if (link->mtu < link->network->ipv6_mtu)
2576 log_link_warning(link, "Cannot set IPv6 MTU %"PRIu32" higher than device MTU %"PRIu32,
2577 link->network->ipv6_mtu, link->mtu);
2578 else
2579 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2580 }
2581
2582 link->ipv6_mtu_set = true;
2583
2584 return 0;
2585 }
2586
2587 static int link_set_ipv4_accept_local(Link *link) {
2588 int r;
2589
2590 if (link->flags & IFF_LOOPBACK)
2591 return 0;
2592
2593 if (link->network->ipv4_accept_local < 0)
2594 return 0;
2595
2596 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "accept_local", link->network->ipv4_accept_local);
2597 if (r < 0)
2598 log_link_warning_errno(link, r, "Cannot set IPv4 accept_local flag for interface: %m");
2599
2600 return 0;
2601 }
2602
2603 static bool link_is_static_address_configured(Link *link, Address *address) {
2604 Address *net_address;
2605
2606 assert(link);
2607 assert(address);
2608
2609 if (!link->network)
2610 return false;
2611
2612 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2613 if (address_equal(net_address, address))
2614 return true;
2615
2616 return false;
2617 }
2618
2619 static bool link_is_neighbor_configured(Link *link, Neighbor *neighbor) {
2620 Neighbor *net_neighbor;
2621
2622 assert(link);
2623 assert(neighbor);
2624
2625 if (!link->network)
2626 return false;
2627
2628 LIST_FOREACH(neighbors, net_neighbor, link->network->neighbors)
2629 if (neighbor_equal(net_neighbor, neighbor))
2630 return true;
2631
2632 return false;
2633 }
2634
2635 static bool link_is_static_route_configured(Link *link, Route *route) {
2636 Route *net_route;
2637
2638 assert(link);
2639 assert(route);
2640
2641 if (!link->network)
2642 return false;
2643
2644 LIST_FOREACH(routes, net_route, link->network->static_routes)
2645 if (route_equal(net_route, route))
2646 return true;
2647
2648 return false;
2649 }
2650
2651 static bool link_address_is_dynamic(Link *link, Address *address) {
2652 Route *route;
2653 Iterator i;
2654
2655 assert(link);
2656 assert(address);
2657
2658 if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2659 return true;
2660
2661 /* Even when the address is leased from a DHCP server, networkd assign the address
2662 * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2663 * corresponding routes with RTPROT_DHCP. */
2664 SET_FOREACH(route, link->routes_foreign, i) {
2665 if (route->protocol != RTPROT_DHCP)
2666 continue;
2667
2668 if (address->family != route->family)
2669 continue;
2670
2671 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2672 return true;
2673 }
2674
2675 return false;
2676 }
2677
2678 static int link_enumerate_ipv6_tentative_addresses(Link *link) {
2679 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
2680 sd_netlink_message *addr;
2681 int r;
2682
2683 assert(link);
2684 assert(link->manager);
2685 assert(link->manager->rtnl);
2686
2687 r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_GETADDR, 0, AF_INET6);
2688 if (r < 0)
2689 return r;
2690
2691 r = sd_netlink_call(link->manager->rtnl, req, 0, &reply);
2692 if (r < 0)
2693 return r;
2694
2695 for (addr = reply; addr; addr = sd_netlink_message_next(addr)) {
2696 unsigned char flags;
2697 int ifindex;
2698
2699 r = sd_rtnl_message_addr_get_ifindex(addr, &ifindex);
2700 if (r < 0) {
2701 log_link_warning_errno(link, r, "rtnl: invalid ifindex, ignoring: %m");
2702 continue;
2703 } else if (link->ifindex != ifindex)
2704 continue;
2705
2706 r = sd_rtnl_message_addr_get_flags(addr, &flags);
2707 if (r < 0) {
2708 log_link_warning_errno(link, r, "rtnl: received address message with invalid flags, ignoring: %m");
2709 continue;
2710 } else if (!(flags & IFA_F_TENTATIVE))
2711 continue;
2712
2713 log_link_debug(link, "Found tentative ipv6 link-local address");
2714 (void) manager_rtnl_process_address(link->manager->rtnl, addr, link->manager);
2715 }
2716
2717 return 0;
2718 }
2719
2720 static int link_drop_foreign_config(Link *link) {
2721 Address *address;
2722 Neighbor *neighbor;
2723 Route *route;
2724 Iterator i;
2725 int r;
2726
2727 /* The kernel doesn't notify us about tentative addresses;
2728 * so if ipv6ll is disabled, we need to enumerate them now so we can drop them below */
2729 if (!link_ipv6ll_enabled(link)) {
2730 r = link_enumerate_ipv6_tentative_addresses(link);
2731 if (r < 0)
2732 return r;
2733 }
2734
2735 SET_FOREACH(address, link->addresses_foreign, i) {
2736 /* we consider IPv6LL addresses to be managed by the kernel */
2737 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2738 continue;
2739
2740 if (link_address_is_dynamic(link, address)) {
2741 if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2742 continue;
2743 } else if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2744 continue;
2745
2746 if (link_is_static_address_configured(link, address)) {
2747 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2748 if (r < 0)
2749 return log_link_error_errno(link, r, "Failed to add address: %m");
2750 } else {
2751 r = address_remove(address, link, NULL);
2752 if (r < 0)
2753 return r;
2754 }
2755 }
2756
2757 SET_FOREACH(neighbor, link->neighbors_foreign, i) {
2758 if (link_is_neighbor_configured(link, neighbor)) {
2759 r = neighbor_add(link, neighbor->family, &neighbor->in_addr, &neighbor->lladdr, neighbor->lladdr_size, NULL);
2760 if (r < 0)
2761 return r;
2762 } else {
2763 r = neighbor_remove(neighbor, link, NULL);
2764 if (r < 0)
2765 return r;
2766 }
2767 }
2768
2769 SET_FOREACH(route, link->routes_foreign, i) {
2770 /* do not touch routes managed by the kernel */
2771 if (route->protocol == RTPROT_KERNEL)
2772 continue;
2773
2774 /* do not touch multicast route added by kernel */
2775 /* FIXME: Why the kernel adds this route with protocol RTPROT_BOOT??? We need to investigate that.
2776 * https://tools.ietf.org/html/rfc4862#section-5.4 may explain why. */
2777 if (route->protocol == RTPROT_BOOT &&
2778 route->family == AF_INET6 &&
2779 route->dst_prefixlen == 8 &&
2780 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 }}} }))
2781 continue;
2782
2783 if (route->protocol == RTPROT_STATIC && link->network &&
2784 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2785 continue;
2786
2787 if (route->protocol == RTPROT_DHCP && link->network &&
2788 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2789 continue;
2790
2791 if (link_is_static_route_configured(link, route)) {
2792 r = route_add(link, route, NULL);
2793 if (r < 0)
2794 return r;
2795 } else {
2796 r = route_remove(route, link, NULL);
2797 if (r < 0)
2798 return r;
2799 }
2800 }
2801
2802 return 0;
2803 }
2804
2805 static int link_drop_config(Link *link) {
2806 Address *address, *pool_address;
2807 Neighbor *neighbor;
2808 Route *route;
2809 Iterator i;
2810 int r;
2811
2812 SET_FOREACH(address, link->addresses, i) {
2813 /* we consider IPv6LL addresses to be managed by the kernel */
2814 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2815 continue;
2816
2817 r = address_remove(address, link, NULL);
2818 if (r < 0)
2819 return r;
2820
2821 /* If this address came from an address pool, clean up the pool */
2822 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2823 if (address_equal(address, pool_address)) {
2824 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2825 address_free(pool_address);
2826 break;
2827 }
2828 }
2829 }
2830
2831 SET_FOREACH(neighbor, link->neighbors, i) {
2832 r = neighbor_remove(neighbor, link, NULL);
2833 if (r < 0)
2834 return r;
2835 }
2836
2837 SET_FOREACH(route, link->routes, i) {
2838 /* do not touch routes managed by the kernel */
2839 if (route->protocol == RTPROT_KERNEL)
2840 continue;
2841
2842 r = route_remove(route, link, NULL);
2843 if (r < 0)
2844 return r;
2845 }
2846
2847 ndisc_flush(link);
2848
2849 return 0;
2850 }
2851
2852 static int link_configure_ipv4_dad(Link *link) {
2853 Address *address;
2854 int r;
2855
2856 assert(link);
2857 assert(link->network);
2858
2859 LIST_FOREACH(addresses, address, link->network->static_addresses)
2860 if (address->family == AF_INET &&
2861 FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV4)) {
2862 r = configure_ipv4_duplicate_address_detection(link, address);
2863 if (r < 0)
2864 return log_link_error_errno(link, r, "Failed to configure IPv4ACD: %m");
2865 }
2866
2867 return 0;
2868 }
2869
2870 static int link_configure_traffic_control(Link *link) {
2871 TrafficControl *tc;
2872 Iterator i;
2873 int r;
2874
2875 link->tc_configured = false;
2876 link->tc_messages = 0;
2877
2878 ORDERED_HASHMAP_FOREACH(tc, link->network->tc_by_section, i) {
2879 r = traffic_control_configure(link, tc);
2880 if (r < 0)
2881 return r;
2882 }
2883
2884 if (link->tc_messages == 0)
2885 link->tc_configured = true;
2886 else
2887 log_link_debug(link, "Configuring traffic control");
2888
2889 return 0;
2890 }
2891
2892 static int link_configure_sr_iov(Link *link) {
2893 SRIOV *sr_iov;
2894 Iterator i;
2895 int r;
2896
2897 link->sr_iov_configured = false;
2898 link->sr_iov_messages = 0;
2899
2900 ORDERED_HASHMAP_FOREACH(sr_iov, link->network->sr_iov_by_section, i) {
2901 r = sr_iov_configure(link, sr_iov);
2902 if (r < 0)
2903 return r;
2904 }
2905
2906 if (link->sr_iov_messages == 0)
2907 link->sr_iov_configured = true;
2908 else
2909 log_link_debug(link, "Configuring SR-IOV");
2910
2911 return 0;
2912 }
2913
2914 static int link_configure(Link *link) {
2915 int r;
2916
2917 assert(link);
2918 assert(link->network);
2919 assert(link->state == LINK_STATE_INITIALIZED);
2920
2921 r = link_configure_traffic_control(link);
2922 if (r < 0)
2923 return r;
2924
2925 r = link_configure_sr_iov(link);
2926 if (r < 0)
2927 return r;
2928
2929 if (link->iftype == ARPHRD_CAN)
2930 return link_configure_can(link);
2931
2932 /* If IPv6 configured that is static IPv6 address and IPv6LL autoconfiguration is enabled
2933 * for this interface, then enable IPv6 */
2934 (void) link_update_ipv6_sysctl(link);
2935
2936 r = link_set_proxy_arp(link);
2937 if (r < 0)
2938 return r;
2939
2940 r = ipv6_proxy_ndp_addresses_configure(link);
2941 if (r < 0)
2942 return r;
2943
2944 r = link_set_ipv4_forward(link);
2945 if (r < 0)
2946 return r;
2947
2948 r = link_set_ipv6_forward(link);
2949 if (r < 0)
2950 return r;
2951
2952 r = link_set_ipv6_privacy_extensions(link);
2953 if (r < 0)
2954 return r;
2955
2956 r = link_set_ipv6_accept_ra(link);
2957 if (r < 0)
2958 return r;
2959
2960 r = link_set_ipv6_dad_transmits(link);
2961 if (r < 0)
2962 return r;
2963
2964 r = link_set_ipv6_hop_limit(link);
2965 if (r < 0)
2966 return r;
2967
2968 r = link_set_ipv4_accept_local(link);
2969 if (r < 0)
2970 return r;
2971
2972 r = link_set_flags(link);
2973 if (r < 0)
2974 return r;
2975
2976 r = link_set_group(link);
2977 if (r < 0)
2978 return r;
2979
2980 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
2981 r = ipv4ll_configure(link);
2982 if (r < 0)
2983 return r;
2984 }
2985
2986 if (link_dhcp4_enabled(link)) {
2987 r = dhcp4_set_promote_secondaries(link);
2988 if (r < 0)
2989 return r;
2990
2991 r = dhcp4_configure(link);
2992 if (r < 0)
2993 return r;
2994 }
2995
2996 if (link_dhcp4_server_enabled(link)) {
2997 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2998 if (r < 0)
2999 return r;
3000
3001 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
3002 if (r < 0)
3003 return r;
3004 }
3005
3006 if (link_dhcp6_enabled(link) ||
3007 link_ipv6_accept_ra_enabled(link)) {
3008 r = dhcp6_configure(link);
3009 if (r < 0)
3010 return r;
3011 }
3012
3013 if (link_ipv6_accept_ra_enabled(link)) {
3014 r = ndisc_configure(link);
3015 if (r < 0)
3016 return r;
3017 }
3018
3019 if (link_radv_enabled(link)) {
3020 r = radv_configure(link);
3021 if (r < 0)
3022 return r;
3023 }
3024
3025 if (link_lldp_rx_enabled(link)) {
3026 r = link_lldp_rx_configure(link);
3027 if (r < 0)
3028 return r;
3029 }
3030
3031 r = link_configure_mtu(link);
3032 if (r < 0)
3033 return r;
3034
3035 r = link_configure_addrgen_mode(link);
3036 if (r < 0)
3037 return r;
3038
3039 r = link_configure_ipv4_dad(link);
3040 if (r < 0)
3041 return r;
3042
3043 return link_configure_continue(link);
3044 }
3045
3046 /* The configuration continues in this separate function, instead of
3047 * including this in the above link_configure() function, for two
3048 * reasons:
3049 * 1) some devices reset the link when the mtu is set, which caused
3050 * an infinite loop here in networkd; see:
3051 * https://github.com/systemd/systemd/issues/6593
3052 * https://github.com/systemd/systemd/issues/9831
3053 * 2) if ipv6ll is disabled, then bringing the interface up must be
3054 * delayed until after we get confirmation from the kernel that
3055 * the addr_gen_mode parameter has been set (via netlink), see:
3056 * https://github.com/systemd/systemd/issues/13882
3057 */
3058 static int link_configure_continue(Link *link) {
3059 int r;
3060
3061 assert(link);
3062 assert(link->network);
3063 assert(link->state == LINK_STATE_INITIALIZED);
3064
3065 if (link->setting_mtu || link->setting_genmode)
3066 return 0;
3067
3068 /* Drop foreign config, but ignore loopback or critical devices.
3069 * We do not want to remove loopback address or addresses used for root NFS. */
3070 if (!(link->flags & IFF_LOOPBACK) &&
3071 link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
3072 r = link_drop_foreign_config(link);
3073 if (r < 0)
3074 return r;
3075 }
3076
3077 /* The kernel resets ipv6 mtu after changing device mtu;
3078 * we must set this here, after we've set device mtu */
3079 r = link_set_ipv6_mtu(link);
3080 if (r < 0)
3081 return r;
3082
3083 if (link_has_carrier(link) || link->network->configure_without_carrier) {
3084 r = link_acquire_conf(link);
3085 if (r < 0)
3086 return r;
3087 }
3088
3089 return link_enter_join_netdev(link);
3090 }
3091
3092 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3093 assert(duid);
3094
3095 if (duid->raw_data_len > 0)
3096 return 0;
3097
3098 if (duid->type != DUID_TYPE_UUID)
3099 return -EINVAL;
3100
3101 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3102 duid->raw_data_len = sizeof(sd_id128_t);
3103
3104 return 1;
3105 }
3106
3107 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3108 Manager *manager = userdata;
3109 const sd_bus_error *e;
3110 const void *a;
3111 size_t sz;
3112 DUID *duid;
3113 Link *link;
3114 int r;
3115
3116 assert(m);
3117 assert(manager);
3118
3119 e = sd_bus_message_get_error(m);
3120 if (e) {
3121 log_error_errno(sd_bus_error_get_errno(e),
3122 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3123 e->message);
3124 goto configure;
3125 }
3126
3127 r = sd_bus_message_read_array(m, 'y', &a, &sz);
3128 if (r < 0)
3129 goto configure;
3130
3131 if (sz != sizeof(sd_id128_t)) {
3132 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3133 goto configure;
3134 }
3135
3136 memcpy(&manager->product_uuid, a, sz);
3137 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3138 (void) duid_set_uuid(duid, manager->product_uuid);
3139
3140 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3141
3142 configure:
3143 while ((link = set_steal_first(manager->links_requesting_uuid))) {
3144 link_unref(link);
3145
3146 r = link_configure(link);
3147 if (r < 0)
3148 link_enter_failed(link);
3149 }
3150
3151 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3152
3153 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3154 * even if the method fails. */
3155 manager->has_product_uuid = true;
3156
3157 return 1;
3158 }
3159
3160 static bool link_requires_uuid(Link *link) {
3161 const DUID *duid;
3162
3163 assert(link);
3164 assert(link->manager);
3165 assert(link->network);
3166
3167 duid = link_get_duid(link);
3168 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3169 return false;
3170
3171 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3172 return true;
3173
3174 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3175 return true;
3176
3177 return false;
3178 }
3179
3180 static int link_configure_duid(Link *link) {
3181 Manager *m;
3182 DUID *duid;
3183 int r;
3184
3185 assert(link);
3186 assert(link->manager);
3187 assert(link->network);
3188
3189 m = link->manager;
3190 duid = link_get_duid(link);
3191
3192 if (!link_requires_uuid(link))
3193 return 1;
3194
3195 if (m->has_product_uuid) {
3196 (void) duid_set_uuid(duid, m->product_uuid);
3197 return 1;
3198 }
3199
3200 if (!m->links_requesting_uuid) {
3201 r = manager_request_product_uuid(m, link);
3202 if (r < 0) {
3203 if (r == -ENOMEM)
3204 return r;
3205
3206 log_link_warning_errno(link, r,
3207 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3208 return 1;
3209 }
3210 } else {
3211 r = set_put(m->links_requesting_uuid, link);
3212 if (r < 0)
3213 return log_oom();
3214 if (r > 0)
3215 link_ref(link);
3216
3217 r = set_put(m->duids_requesting_uuid, duid);
3218 if (r < 0)
3219 return log_oom();
3220 }
3221
3222 return 0;
3223 }
3224
3225 static int link_reconfigure_internal(Link *link, sd_netlink_message *m, bool force) {
3226 Network *network;
3227 int r;
3228
3229 if (m) {
3230 _cleanup_strv_free_ char **s = NULL;
3231
3232 r = sd_netlink_message_get_errno(m);
3233 if (r < 0)
3234 return r;
3235
3236 r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3237 if (r < 0 && r != -ENODATA)
3238 return r;
3239
3240 strv_free_and_replace(link->alternative_names, s);
3241 }
3242
3243 r = network_get(link->manager, link->iftype, link->sd_device,
3244 link->ifname, link->alternative_names, link->driver,
3245 &link->mac, &link->permanent_mac,
3246 link->wlan_iftype, link->ssid, &link->bssid, &network);
3247 if (r == -ENOENT) {
3248 link_enter_unmanaged(link);
3249 return 0;
3250 } else if (r == 0 && network->unmanaged) {
3251 link_enter_unmanaged(link);
3252 return 0;
3253 } else if (r < 0)
3254 return r;
3255
3256 if (link->network == network && !force)
3257 return 0;
3258
3259 log_link_info(link, "Re-configuring with %s", network->filename);
3260
3261 /* Dropping old .network file */
3262 r = link_stop_clients(link, false);
3263 if (r < 0)
3264 return r;
3265
3266 if (link_dhcp4_server_enabled(link))
3267 (void) sd_dhcp_server_stop(link->dhcp_server);
3268
3269 r = link_drop_config(link);
3270 if (r < 0)
3271 return r;
3272
3273 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3274 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3275 r = link_drop_foreign_config(link);
3276 if (r < 0)
3277 return r;
3278 }
3279
3280 link_free_carrier_maps(link);
3281 link_free_engines(link);
3282 link->network = network_unref(link->network);
3283
3284 /* Then, apply new .network file */
3285 r = network_apply(network, link);
3286 if (r < 0)
3287 return r;
3288
3289 r = link_new_carrier_maps(link);
3290 if (r < 0)
3291 return r;
3292
3293 link_set_state(link, LINK_STATE_INITIALIZED);
3294 link_dirty(link);
3295
3296 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3297 * link_configure() is called later asynchronously. */
3298 r = link_configure_duid(link);
3299 if (r <= 0)
3300 return r;
3301
3302 r = link_configure(link);
3303 if (r < 0)
3304 return r;
3305
3306 return 0;
3307 }
3308
3309 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3310 int r;
3311
3312 r = link_reconfigure_internal(link, m, false);
3313 if (r < 0)
3314 link_enter_failed(link);
3315
3316 return 1;
3317 }
3318
3319 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3320 int r;
3321
3322 r = link_reconfigure_internal(link, m, true);
3323 if (r < 0)
3324 link_enter_failed(link);
3325
3326 return 1;
3327 }
3328
3329 int link_reconfigure(Link *link, bool force) {
3330 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3331 int r;
3332
3333 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
3334 return 0;
3335
3336 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3337 link->ifindex);
3338 if (r < 0)
3339 return r;
3340
3341 r = netlink_call_async(link->manager->rtnl, NULL, req,
3342 force ? link_force_reconfigure_handler : link_reconfigure_handler,
3343 link_netlink_destroy_callback, link);
3344 if (r < 0)
3345 return r;
3346
3347 link_ref(link);
3348
3349 return 0;
3350 }
3351
3352 static int link_initialized_and_synced(Link *link) {
3353 Network *network;
3354 int r;
3355
3356 assert(link);
3357 assert(link->ifname);
3358 assert(link->manager);
3359
3360 /* We may get called either from the asynchronous netlink callback,
3361 * or directly for link_add() if running in a container. See link_add(). */
3362 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3363 return 0;
3364
3365 log_link_debug(link, "Link state is up-to-date");
3366 link_set_state(link, LINK_STATE_INITIALIZED);
3367
3368 r = link_new_bound_by_list(link);
3369 if (r < 0)
3370 return r;
3371
3372 r = link_handle_bound_by_list(link);
3373 if (r < 0)
3374 return r;
3375
3376 if (!link->network) {
3377 r = wifi_get_info(link);
3378 if (r < 0)
3379 return r;
3380
3381 r = network_get(link->manager, link->iftype, link->sd_device,
3382 link->ifname, link->alternative_names, link->driver,
3383 &link->mac, &link->permanent_mac,
3384 link->wlan_iftype, link->ssid, &link->bssid, &network);
3385 if (r == -ENOENT) {
3386 link_enter_unmanaged(link);
3387 return 0;
3388 } else if (r == 0 && network->unmanaged) {
3389 link_enter_unmanaged(link);
3390 return 0;
3391 } else if (r < 0)
3392 return r;
3393
3394 if (link->flags & IFF_LOOPBACK) {
3395 if (network->link_local != ADDRESS_FAMILY_NO)
3396 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3397
3398 if (network->dhcp != ADDRESS_FAMILY_NO)
3399 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3400
3401 if (network->dhcp_server)
3402 log_link_debug(link, "Ignoring DHCP server for loopback link");
3403 }
3404
3405 r = network_apply(network, link);
3406 if (r < 0)
3407 return r;
3408 }
3409
3410 r = link_new_bound_to_list(link);
3411 if (r < 0)
3412 return r;
3413
3414 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3415 * link_configure() is called later asynchronously. */
3416 r = link_configure_duid(link);
3417 if (r <= 0)
3418 return r;
3419
3420 r = link_configure(link);
3421 if (r < 0)
3422 return r;
3423
3424 return 0;
3425 }
3426
3427 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3428 _cleanup_strv_free_ char **s = NULL;
3429 int r;
3430
3431 r = sd_netlink_message_get_errno(m);
3432 if (r < 0) {
3433 log_link_warning_errno(link, r, "Failed to wait for the interface to be initialized: %m");
3434 link_enter_failed(link);
3435 return 0;
3436 }
3437
3438 r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3439 if (r < 0 && r != -ENODATA) {
3440 link_enter_failed(link);
3441 return 0;
3442 }
3443
3444 strv_free_and_replace(link->alternative_names, s);
3445
3446 r = link_initialized_and_synced(link);
3447 if (r < 0)
3448 link_enter_failed(link);
3449 return 1;
3450 }
3451
3452 int link_initialized(Link *link, sd_device *device) {
3453 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3454 int r;
3455
3456 assert(link);
3457 assert(link->manager);
3458 assert(link->manager->rtnl);
3459 assert(device);
3460
3461 if (link->state != LINK_STATE_PENDING)
3462 return 0;
3463
3464 if (link->sd_device)
3465 return 0;
3466
3467 log_link_debug(link, "udev initialized link");
3468 link_set_state(link, LINK_STATE_INITIALIZED);
3469
3470 link->sd_device = sd_device_ref(device);
3471
3472 /* udev has initialized the link, but we don't know if we have yet
3473 * processed the NEWLINK messages with the latest state. Do a GETLINK,
3474 * when it returns we know that the pending NEWLINKs have already been
3475 * processed and that we are up-to-date */
3476
3477 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3478 link->ifindex);
3479 if (r < 0)
3480 return r;
3481
3482 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3483 link_netlink_destroy_callback, link);
3484 if (r < 0)
3485 return r;
3486
3487 link_ref(link);
3488
3489 return 0;
3490 }
3491
3492 static int link_load(Link *link) {
3493 _cleanup_free_ char *network_file = NULL,
3494 *addresses = NULL,
3495 *routes = NULL,
3496 *dhcp4_address = NULL,
3497 *ipv4ll_address = NULL;
3498 union in_addr_union address;
3499 int r;
3500
3501 assert(link);
3502
3503 r = parse_env_file(NULL, link->state_file,
3504 "NETWORK_FILE", &network_file,
3505 "ADDRESSES", &addresses,
3506 "ROUTES", &routes,
3507 "DHCP4_ADDRESS", &dhcp4_address,
3508 "IPV4LL_ADDRESS", &ipv4ll_address);
3509 if (r < 0 && r != -ENOENT)
3510 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3511
3512 if (network_file) {
3513 Network *network;
3514 char *suffix;
3515
3516 /* drop suffix */
3517 suffix = strrchr(network_file, '.');
3518 if (!suffix) {
3519 log_link_debug(link, "Failed to get network name from %s", network_file);
3520 goto network_file_fail;
3521 }
3522 *suffix = '\0';
3523
3524 r = network_get_by_name(link->manager, basename(network_file), &network);
3525 if (r < 0) {
3526 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3527 goto network_file_fail;
3528 }
3529
3530 r = network_apply(network, link);
3531 if (r < 0)
3532 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3533 }
3534
3535 network_file_fail:
3536
3537 for (const char *p = addresses; p; ) {
3538 _cleanup_free_ char *address_str = NULL;
3539 char *prefixlen_str;
3540 int family;
3541 unsigned char prefixlen;
3542
3543 r = extract_first_word(&p, &address_str, NULL, 0);
3544 if (r < 0)
3545 log_link_warning_errno(link, r, "failed to parse ADDRESSES: %m");
3546 if (r <= 0)
3547 break;
3548
3549 prefixlen_str = strchr(address_str, '/');
3550 if (!prefixlen_str) {
3551 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3552 continue;
3553 }
3554 *prefixlen_str++ = '\0';
3555
3556 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3557 if (r != 1) {
3558 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3559 continue;
3560 }
3561
3562 r = in_addr_from_string_auto(address_str, &family, &address);
3563 if (r < 0) {
3564 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3565 continue;
3566 }
3567
3568 r = address_add(link, family, &address, prefixlen, NULL);
3569 if (r < 0)
3570 return log_link_error_errno(link, r, "Failed to add address: %m");
3571 }
3572
3573 for (const char *p = routes; p; ) {
3574 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3575 _cleanup_(route_freep) Route *tmp = NULL;
3576 _cleanup_free_ char *route_str = NULL;
3577 char *prefixlen_str;
3578 Route *route;
3579
3580 r = extract_first_word(&p, &route_str, NULL, 0);
3581 if (r < 0)
3582 log_link_debug_errno(link, r, "failed to parse ROUTES: %m");
3583 if (r <= 0)
3584 break;
3585
3586 prefixlen_str = strchr(route_str, '/');
3587 if (!prefixlen_str) {
3588 log_link_debug(link, "Failed to parse route %s", route_str);
3589 continue;
3590 }
3591 *prefixlen_str++ = '\0';
3592
3593 r = route_new(&tmp);
3594 if (r < 0)
3595 return log_oom();
3596
3597 r = sscanf(prefixlen_str,
3598 "%hhu/%hhu/%"SCNu32"/%"PRIu32"/"USEC_FMT,
3599 &tmp->dst_prefixlen,
3600 &tmp->tos,
3601 &tmp->priority,
3602 &tmp->table,
3603 &tmp->lifetime);
3604 if (r != 5) {
3605 log_link_debug(link,
3606 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3607 prefixlen_str);
3608 continue;
3609 }
3610
3611 r = in_addr_from_string_auto(route_str, &tmp->family, &tmp->dst);
3612 if (r < 0) {
3613 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3614 continue;
3615 }
3616
3617 r = route_add(link, tmp, &route);
3618 if (r < 0)
3619 return log_link_error_errno(link, r, "Failed to add route: %m");
3620
3621 if (route->lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3622 r = sd_event_add_time(link->manager->event, &expire,
3623 clock_boottime_or_monotonic(),
3624 route->lifetime, 0, route_expire_handler, route);
3625 if (r < 0)
3626 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3627 }
3628
3629 sd_event_source_unref(route->expire);
3630 route->expire = TAKE_PTR(expire);
3631 }
3632
3633 if (dhcp4_address) {
3634 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3635 if (r < 0) {
3636 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3637 goto dhcp4_address_fail;
3638 }
3639
3640 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3641 if (r < 0)
3642 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3643
3644 r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
3645 if (r < 0)
3646 return log_link_error_errno(link, r, "Failed to attach DHCPv4 event: %m");
3647
3648 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3649 if (r < 0)
3650 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3651 }
3652
3653 dhcp4_address_fail:
3654
3655 if (ipv4ll_address) {
3656 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3657 if (r < 0) {
3658 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3659 goto ipv4ll_address_fail;
3660 }
3661
3662 r = sd_ipv4ll_new(&link->ipv4ll);
3663 if (r < 0)
3664 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3665
3666 r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
3667 if (r < 0)
3668 return log_link_error_errno(link, r, "Failed to attach IPv4LL event: %m");
3669
3670 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3671 if (r < 0)
3672 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3673 }
3674
3675 ipv4ll_address_fail:
3676
3677 return 0;
3678 }
3679
3680 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3681 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3682 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3683 Link *link;
3684 int r;
3685
3686 assert(m);
3687 assert(m->rtnl);
3688 assert(message);
3689 assert(ret);
3690
3691 r = link_new(m, message, ret);
3692 if (r < 0)
3693 return r;
3694
3695 link = *ret;
3696
3697 log_link_debug(link, "Link %d added", link->ifindex);
3698
3699 r = link_load(link);
3700 if (r < 0)
3701 return r;
3702
3703 if (path_is_read_only_fs("/sys") <= 0) {
3704 /* udev should be around */
3705 sprintf(ifindex_str, "n%d", link->ifindex);
3706 r = sd_device_new_from_device_id(&device, ifindex_str);
3707 if (r < 0) {
3708 log_link_warning_errno(link, r, "Could not find device, waiting for device initialization: %m");
3709 return 0;
3710 }
3711
3712 r = sd_device_get_is_initialized(device);
3713 if (r < 0) {
3714 log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
3715 goto failed;
3716 }
3717 if (r == 0) {
3718 /* not yet ready */
3719 log_link_debug(link, "link pending udev initialization...");
3720 return 0;
3721 }
3722
3723 r = device_is_renaming(device);
3724 if (r < 0) {
3725 log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
3726 goto failed;
3727 }
3728 if (r > 0) {
3729 log_link_debug(link, "Interface is being renamed, pending initialization.");
3730 return 0;
3731 }
3732
3733 r = link_initialized(link, device);
3734 if (r < 0)
3735 goto failed;
3736 } else {
3737 r = link_initialized_and_synced(link);
3738 if (r < 0)
3739 goto failed;
3740 }
3741
3742 return 0;
3743 failed:
3744 link_enter_failed(link);
3745 return r;
3746 }
3747
3748 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3749 int r;
3750
3751 assert(link);
3752
3753 log_link_info(link, "Gained IPv6LL");
3754
3755 link->ipv6ll_address = *address;
3756 link_check_ready(link);
3757
3758 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3759 r = link_acquire_ipv6_conf(link);
3760 if (r < 0) {
3761 link_enter_failed(link);
3762 return r;
3763 }
3764 }
3765
3766 return 0;
3767 }
3768
3769 static int link_carrier_gained(Link *link) {
3770 int r;
3771
3772 assert(link);
3773
3774 r = wifi_get_info(link);
3775 if (r < 0)
3776 return r;
3777 if (r > 0) {
3778 r = link_reconfigure_internal(link, NULL, false);
3779 if (r < 0) {
3780 link_enter_failed(link);
3781 return r;
3782 }
3783 }
3784
3785 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3786 r = link_acquire_conf(link);
3787 if (r < 0) {
3788 link_enter_failed(link);
3789 return r;
3790 }
3791
3792 link_set_state(link, LINK_STATE_CONFIGURING);
3793 r = link_request_set_addresses(link);
3794 if (r < 0)
3795 return r;
3796 }
3797
3798 r = link_handle_bound_by_list(link);
3799 if (r < 0)
3800 return r;
3801
3802 return 0;
3803 }
3804
3805 static int link_carrier_lost(Link *link) {
3806 int r;
3807
3808 assert(link);
3809
3810 if (link->network && link->network->ignore_carrier_loss)
3811 return 0;
3812
3813 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3814 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3815 * configuration and stop the clients as well. */
3816 if (link->setting_mtu)
3817 return 0;
3818
3819 r = link_stop_clients(link, false);
3820 if (r < 0) {
3821 link_enter_failed(link);
3822 return r;
3823 }
3824
3825 if (link_dhcp4_server_enabled(link))
3826 (void) sd_dhcp_server_stop(link->dhcp_server);
3827
3828 r = link_drop_config(link);
3829 if (r < 0)
3830 return r;
3831
3832 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3833 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3834 r = link_drop_foreign_config(link);
3835 if (r < 0)
3836 return r;
3837 }
3838
3839 r = link_handle_bound_by_list(link);
3840 if (r < 0)
3841 return r;
3842
3843 return 0;
3844 }
3845
3846 int link_carrier_reset(Link *link) {
3847 int r;
3848
3849 assert(link);
3850
3851 if (link_has_carrier(link)) {
3852 r = link_carrier_lost(link);
3853 if (r < 0)
3854 return r;
3855
3856 r = link_carrier_gained(link);
3857 if (r < 0)
3858 return r;
3859
3860 log_link_info(link, "Reset carrier");
3861 }
3862
3863 return 0;
3864 }
3865
3866 /* This is called every time an interface admin state changes to up;
3867 * specifically, when IFF_UP flag changes from unset to set */
3868 static int link_admin_state_up(Link *link) {
3869 int r;
3870
3871 /* We set the ipv6 mtu after the device mtu, but the kernel resets
3872 * ipv6 mtu on NETDEV_UP, so we need to reset it. The check for
3873 * ipv6_mtu_set prevents this from trying to set it too early before
3874 * the link->network has been setup; we only need to reset it
3875 * here if we've already set it during normal initialization. */
3876 if (link->ipv6_mtu_set) {
3877 r = link_set_ipv6_mtu(link);
3878 if (r < 0)
3879 return r;
3880 }
3881
3882 return 0;
3883 }
3884
3885 int link_update(Link *link, sd_netlink_message *m) {
3886 _cleanup_strv_free_ char **s = NULL;
3887 struct ether_addr mac;
3888 const char *ifname;
3889 uint32_t mtu;
3890 bool had_carrier, carrier_gained, carrier_lost, link_was_admin_up;
3891 int old_master, r;
3892
3893 assert(link);
3894 assert(link->ifname);
3895 assert(m);
3896
3897 if (link->state == LINK_STATE_LINGER) {
3898 log_link_info(link, "Link re-added");
3899 link_set_state(link, LINK_STATE_CONFIGURING);
3900
3901 r = link_new_carrier_maps(link);
3902 if (r < 0)
3903 return r;
3904 }
3905
3906 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3907 if (r >= 0 && !streq(ifname, link->ifname)) {
3908 Manager *manager = link->manager;
3909
3910 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3911
3912 link_drop(link);
3913 r = link_add(manager, m, &link);
3914 if (r < 0)
3915 return r;
3916 }
3917
3918 r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3919 if (r >= 0)
3920 strv_free_and_replace(link->alternative_names, s);
3921
3922 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3923 if (r >= 0 && mtu > 0) {
3924 link->mtu = mtu;
3925 if (link->original_mtu == 0) {
3926 link->original_mtu = mtu;
3927 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3928 }
3929
3930 if (link->dhcp_client) {
3931 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3932 link->mtu);
3933 if (r < 0)
3934 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3935 }
3936
3937 if (link->radv) {
3938 r = sd_radv_set_mtu(link->radv, link->mtu);
3939 if (r < 0)
3940 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3941 }
3942 }
3943
3944 /* The kernel may broadcast NEWLINK messages without the MAC address
3945 set, simply ignore them. */
3946 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3947 if (r >= 0) {
3948 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3949 ETH_ALEN)) {
3950
3951 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3952 ETH_ALEN);
3953
3954 log_link_debug(link, "MAC address: "
3955 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3956 mac.ether_addr_octet[0],
3957 mac.ether_addr_octet[1],
3958 mac.ether_addr_octet[2],
3959 mac.ether_addr_octet[3],
3960 mac.ether_addr_octet[4],
3961 mac.ether_addr_octet[5]);
3962
3963 if (link->ipv4ll) {
3964 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3965 if (r < 0)
3966 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3967 }
3968
3969 if (link->dhcp_client) {
3970 r = sd_dhcp_client_set_mac(link->dhcp_client,
3971 (const uint8_t *) &link->mac,
3972 sizeof (link->mac),
3973 ARPHRD_ETHER);
3974 if (r < 0)
3975 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3976
3977 r = dhcp4_set_client_identifier(link);
3978 if (r < 0)
3979 return r;
3980 }
3981
3982 if (link->dhcp6_client) {
3983 const DUID* duid = link_get_duid(link);
3984
3985 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3986 (const uint8_t *) &link->mac,
3987 sizeof (link->mac),
3988 ARPHRD_ETHER);
3989 if (r < 0)
3990 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3991
3992 if (link->network->iaid_set) {
3993 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3994 link->network->iaid);
3995 if (r < 0)
3996 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3997 }
3998
3999 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
4000 duid->type,
4001 duid->raw_data_len > 0 ? duid->raw_data : NULL,
4002 duid->raw_data_len);
4003 if (r < 0)
4004 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
4005 }
4006
4007 if (link->radv) {
4008 r = sd_radv_set_mac(link->radv, &link->mac);
4009 if (r < 0)
4010 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
4011 }
4012
4013 if (link->ndisc) {
4014 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
4015 if (r < 0)
4016 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
4017 }
4018 }
4019 }
4020
4021 old_master = link->master_ifindex;
4022 (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
4023
4024 link_was_admin_up = link->flags & IFF_UP;
4025 had_carrier = link_has_carrier(link);
4026
4027 r = link_update_flags(link, m, old_master != link->master_ifindex);
4028 if (r < 0)
4029 return r;
4030
4031 if (!link_was_admin_up && (link->flags & IFF_UP)) {
4032 log_link_info(link, "Link UP");
4033
4034 r = link_admin_state_up(link);
4035 if (r < 0)
4036 return r;
4037 } else if (link_was_admin_up && !(link->flags & IFF_UP))
4038 log_link_info(link, "Link DOWN");
4039
4040 r = link_update_lldp(link);
4041 if (r < 0)
4042 return r;
4043
4044 carrier_gained = !had_carrier && link_has_carrier(link);
4045 carrier_lost = had_carrier && !link_has_carrier(link);
4046
4047 if (carrier_gained) {
4048 log_link_info(link, "Gained carrier");
4049
4050 r = link_carrier_gained(link);
4051 if (r < 0)
4052 return r;
4053 } else if (carrier_lost) {
4054 log_link_info(link, "Lost carrier");
4055
4056 r = link_carrier_lost(link);
4057 if (r < 0)
4058 return r;
4059 }
4060
4061 return 0;
4062 }
4063
4064 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
4065 bool space = false;
4066 Iterator i;
4067 Link *link;
4068
4069 assert(f);
4070 assert(prefix);
4071
4072 if (hashmap_isempty(h))
4073 return;
4074
4075 fputs(prefix, f);
4076 HASHMAP_FOREACH(link, h, i) {
4077 if (space)
4078 fputc(' ', f);
4079
4080 fprintf(f, "%i", link->ifindex);
4081 space = true;
4082 }
4083
4084 fputc('\n', f);
4085 }
4086
4087 static void link_save_dns(FILE *f, struct in_addr_data *dns, unsigned n_dns, bool *space) {
4088 for (unsigned j = 0; j < n_dns; j++) {
4089 _cleanup_free_ char *b = NULL;
4090 int r;
4091
4092 r = in_addr_to_string(dns[j].family, &dns[j].address, &b);
4093 if (r < 0) {
4094 log_debug_errno(r, "Failed to format address, ignoring: %m");
4095 continue;
4096 }
4097
4098 if (*space)
4099 fputc(' ', f);
4100 fputs(b, f);
4101 *space = true;
4102 }
4103 }
4104
4105 static void serialize_addresses(
4106 FILE *f,
4107 const char *lvalue,
4108 bool *space,
4109 char **addresses,
4110 sd_dhcp_lease *lease,
4111 bool conditional,
4112 sd_dhcp_lease_server_type what,
4113 sd_dhcp6_lease *lease6,
4114 bool conditional6,
4115 int (*lease6_get_addr)(sd_dhcp6_lease*, const struct in6_addr**),
4116 int (*lease6_get_fqdn)(sd_dhcp6_lease*, char ***)) {
4117 int r;
4118
4119 bool _space = false;
4120 if (!space)
4121 space = &_space;
4122
4123 if (lvalue)
4124 fprintf(f, "%s=", lvalue);
4125 fputstrv(f, addresses, NULL, space);
4126
4127 if (lease && conditional) {
4128 const struct in_addr *lease_addresses;
4129
4130 r = sd_dhcp_lease_get_servers(lease, what, &lease_addresses);
4131 if (r > 0)
4132 serialize_in_addrs(f, lease_addresses, r, space, in4_addr_is_non_local);
4133 }
4134
4135 if (lease6 && conditional6 && lease6_get_addr) {
4136 const struct in6_addr *in6_addrs;
4137
4138 r = lease6_get_addr(lease6, &in6_addrs);
4139 if (r > 0)
4140 serialize_in6_addrs(f, in6_addrs, r, space);
4141 }
4142
4143 if (lease6 && conditional6 && lease6_get_fqdn) {
4144 char **in6_hosts;
4145
4146 r = lease6_get_fqdn(lease6, &in6_hosts);
4147 if (r > 0)
4148 fputstrv(f, in6_hosts, NULL, space);
4149 }
4150
4151 if (lvalue)
4152 fputc('\n', f);
4153 }
4154
4155 int link_save(Link *link) {
4156 const char *admin_state, *oper_state, *carrier_state, *address_state;
4157 _cleanup_free_ char *temp_path = NULL;
4158 _cleanup_fclose_ FILE *f = NULL;
4159 Route *route;
4160 Address *a;
4161 Iterator i;
4162 int r;
4163
4164 assert(link);
4165 assert(link->state_file);
4166 assert(link->lease_file);
4167 assert(link->manager);
4168
4169 if (link->state == LINK_STATE_LINGER) {
4170 (void) unlink(link->state_file);
4171 return 0;
4172 }
4173
4174 link_lldp_save(link);
4175
4176 admin_state = link_state_to_string(link->state);
4177 assert(admin_state);
4178
4179 oper_state = link_operstate_to_string(link->operstate);
4180 assert(oper_state);
4181
4182 carrier_state = link_carrier_state_to_string(link->carrier_state);
4183 assert(carrier_state);
4184
4185 address_state = link_address_state_to_string(link->address_state);
4186 assert(address_state);
4187
4188 r = fopen_temporary(link->state_file, &f, &temp_path);
4189 if (r < 0)
4190 goto fail;
4191
4192 (void) fchmod(fileno(f), 0644);
4193
4194 fprintf(f,
4195 "# This is private data. Do not parse.\n"
4196 "ADMIN_STATE=%s\n"
4197 "OPER_STATE=%s\n"
4198 "CARRIER_STATE=%s\n"
4199 "ADDRESS_STATE=%s\n",
4200 admin_state, oper_state, carrier_state, address_state);
4201
4202 if (link->network) {
4203 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
4204 const char *dhcp_domainname = NULL, *p;
4205 sd_dhcp6_lease *dhcp6_lease = NULL;
4206 bool space;
4207
4208 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4209 yes_no(link->network->required_for_online));
4210
4211 LinkOperationalStateRange st = link->network->required_operstate_for_online;
4212 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s%s%s\n",
4213 strempty(link_operstate_to_string(st.min)),
4214 st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? ":" : "",
4215 st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? strempty(link_operstate_to_string(st.max)) : "");
4216
4217 if (link->dhcp6_client) {
4218 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
4219 if (r < 0 && r != -ENOMSG)
4220 log_link_debug_errno(link, r, "Failed to get DHCPv6 lease: %m");
4221 }
4222
4223 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4224
4225 /************************************************************/
4226
4227 fputs("DNS=", f);
4228 space = false;
4229 if (link->n_dns != (unsigned) -1)
4230 link_save_dns(f, link->dns, link->n_dns, &space);
4231 else
4232 link_save_dns(f, link->network->dns, link->network->n_dns, &space);
4233
4234 serialize_addresses(f, NULL, &space,
4235 NULL,
4236 link->dhcp_lease,
4237 link->network->dhcp_use_dns,
4238 SD_DHCP_LEASE_DNS,
4239 dhcp6_lease,
4240 link->network->dhcp6_use_dns,
4241 sd_dhcp6_lease_get_dns,
4242 NULL);
4243
4244 /* Make sure to flush out old entries before we use the NDISC data */
4245 ndisc_vacuum(link);
4246
4247 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4248 NDiscRDNSS *dd;
4249
4250 SET_FOREACH(dd, link->ndisc_rdnss, i)
4251 serialize_in6_addrs(f, &dd->address, 1, &space);
4252 }
4253
4254 fputc('\n', f);
4255
4256 /************************************************************/
4257
4258 serialize_addresses(f, "NTP", NULL,
4259 link->ntp ?: link->network->ntp,
4260 link->dhcp_lease,
4261 link->network->dhcp_use_ntp,
4262 SD_DHCP_LEASE_NTP,
4263 dhcp6_lease,
4264 link->network->dhcp6_use_ntp,
4265 sd_dhcp6_lease_get_ntp_addrs,
4266 sd_dhcp6_lease_get_ntp_fqdn);
4267
4268 serialize_addresses(f, "SIP", NULL,
4269 NULL,
4270 link->dhcp_lease,
4271 link->network->dhcp_use_sip,
4272 SD_DHCP_LEASE_SIP,
4273 NULL, false, NULL, NULL);
4274
4275 /************************************************************/
4276
4277 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4278 if (link->dhcp_lease) {
4279 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4280 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4281 }
4282 if (dhcp6_lease)
4283 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4284 }
4285
4286 fputs("DOMAINS=", f);
4287 space = false;
4288 ORDERED_SET_FOREACH(p, link->search_domains ?: link->network->search_domains, i)
4289 fputs_with_space(f, p, NULL, &space);
4290
4291 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4292 if (dhcp_domainname)
4293 fputs_with_space(f, dhcp_domainname, NULL, &space);
4294 if (dhcp_domains)
4295 fputstrv(f, dhcp_domains, NULL, &space);
4296 if (dhcp6_domains)
4297 fputstrv(f, dhcp6_domains, NULL, &space);
4298 }
4299
4300 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_YES) {
4301 NDiscDNSSL *dd;
4302
4303 SET_FOREACH(dd, link->ndisc_dnssl, i)
4304 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4305 }
4306
4307 fputc('\n', f);
4308
4309 /************************************************************/
4310
4311 fputs("ROUTE_DOMAINS=", f);
4312 space = false;
4313 ORDERED_SET_FOREACH(p, link->route_domains ?: link->network->route_domains, i)
4314 fputs_with_space(f, p, NULL, &space);
4315
4316 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4317 if (dhcp_domainname)
4318 fputs_with_space(f, dhcp_domainname, NULL, &space);
4319 if (dhcp_domains)
4320 fputstrv(f, dhcp_domains, NULL, &space);
4321 if (dhcp6_domains)
4322 fputstrv(f, dhcp6_domains, NULL, &space);
4323 }
4324
4325 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4326 NDiscDNSSL *dd;
4327
4328 SET_FOREACH(dd, link->ndisc_dnssl, i)
4329 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4330 }
4331
4332 fputc('\n', f);
4333
4334 /************************************************************/
4335
4336 fprintf(f, "LLMNR=%s\n",
4337 resolve_support_to_string(link->llmnr >= 0 ? link->llmnr : link->network->llmnr));
4338
4339 /************************************************************/
4340
4341 fprintf(f, "MDNS=%s\n",
4342 resolve_support_to_string(link->mdns >= 0 ? link->mdns : link->network->mdns));
4343
4344 /************************************************************/
4345
4346 int dns_default_route =
4347 link->dns_default_route >= 0 ? link->dns_default_route :
4348 link->network->dns_default_route;
4349 if (dns_default_route >= 0)
4350 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(dns_default_route));
4351
4352 /************************************************************/
4353
4354 DnsOverTlsMode dns_over_tls_mode =
4355 link->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID ? link->dns_over_tls_mode :
4356 link->network->dns_over_tls_mode;
4357 if (dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4358 fprintf(f, "DNS_OVER_TLS=%s\n", dns_over_tls_mode_to_string(dns_over_tls_mode));
4359
4360 /************************************************************/
4361
4362 DnssecMode dnssec_mode =
4363 link->dnssec_mode != _DNSSEC_MODE_INVALID ? link->dnssec_mode :
4364 link->network->dnssec_mode;
4365 if (dnssec_mode != _DNSSEC_MODE_INVALID)
4366 fprintf(f, "DNSSEC=%s\n", dnssec_mode_to_string(dnssec_mode));
4367
4368 /************************************************************/
4369
4370 Set *nta_anchors = link->dnssec_negative_trust_anchors;
4371 if (set_isempty(nta_anchors))
4372 nta_anchors = link->network->dnssec_negative_trust_anchors;
4373
4374 if (!set_isempty(nta_anchors)) {
4375 const char *n;
4376
4377 fputs("DNSSEC_NTA=", f);
4378 space = false;
4379 SET_FOREACH(n, nta_anchors, i)
4380 fputs_with_space(f, n, NULL, &space);
4381 fputc('\n', f);
4382 }
4383
4384 /************************************************************/
4385
4386 fputs("ADDRESSES=", f);
4387 space = false;
4388 SET_FOREACH(a, link->addresses, i) {
4389 _cleanup_free_ char *address_str = NULL;
4390
4391 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4392 if (r < 0)
4393 goto fail;
4394
4395 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4396 space = true;
4397 }
4398 fputc('\n', f);
4399
4400 /************************************************************/
4401
4402 fputs("ROUTES=", f);
4403 space = false;
4404 SET_FOREACH(route, link->routes, i) {
4405 _cleanup_free_ char *route_str = NULL;
4406
4407 r = in_addr_to_string(route->family, &route->dst, &route_str);
4408 if (r < 0)
4409 goto fail;
4410
4411 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4412 space ? " " : "", route_str,
4413 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4414 space = true;
4415 }
4416
4417 fputc('\n', f);
4418 }
4419
4420 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4421 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4422
4423 if (link->dhcp_lease) {
4424 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4425 if (r < 0)
4426 goto fail;
4427
4428 fprintf(f,
4429 "DHCP_LEASE=%s\n",
4430 link->lease_file);
4431 } else
4432 (void) unlink(link->lease_file);
4433
4434 if (link->ipv4ll) {
4435 struct in_addr address;
4436
4437 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4438 if (r >= 0) {
4439 fputs("IPV4LL_ADDRESS=", f);
4440 serialize_in_addrs(f, &address, 1, false, NULL);
4441 fputc('\n', f);
4442 }
4443 }
4444
4445 if (link->dhcp6_client) {
4446 _cleanup_free_ char *duid = NULL;
4447 uint32_t iaid;
4448
4449 r = sd_dhcp6_client_get_iaid(link->dhcp6_client, &iaid);
4450 if (r >= 0)
4451 fprintf(f, "DHCP6_CLIENT_IAID=0x%x\n", iaid);
4452
4453 r = sd_dhcp6_client_duid_as_string(link->dhcp6_client, &duid);
4454 if (r >= 0)
4455 fprintf(f, "DHCP6_CLIENT_DUID=%s\n", duid);
4456 }
4457
4458 r = fflush_and_check(f);
4459 if (r < 0)
4460 goto fail;
4461
4462 if (rename(temp_path, link->state_file) < 0) {
4463 r = -errno;
4464 goto fail;
4465 }
4466
4467 return 0;
4468
4469 fail:
4470 (void) unlink(link->state_file);
4471 if (temp_path)
4472 (void) unlink(temp_path);
4473
4474 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4475 }
4476
4477 /* The serialized state in /run is no longer up-to-date. */
4478 void link_dirty(Link *link) {
4479 int r;
4480
4481 assert(link);
4482
4483 /* mark manager dirty as link is dirty */
4484 manager_dirty(link->manager);
4485
4486 r = set_ensure_put(&link->manager->dirty_links, NULL, link);
4487 if (r <= 0)
4488 /* Ignore allocation errors and don't take another ref if the link was already dirty */
4489 return;
4490 link_ref(link);
4491 }
4492
4493 /* The serialized state in /run is up-to-date */
4494 void link_clean(Link *link) {
4495 assert(link);
4496 assert(link->manager);
4497
4498 link_unref(set_remove(link->manager->dirty_links, link));
4499 }
4500
4501 static const char* const link_state_table[_LINK_STATE_MAX] = {
4502 [LINK_STATE_PENDING] = "pending",
4503 [LINK_STATE_INITIALIZED] = "initialized",
4504 [LINK_STATE_CONFIGURING] = "configuring",
4505 [LINK_STATE_CONFIGURED] = "configured",
4506 [LINK_STATE_UNMANAGED] = "unmanaged",
4507 [LINK_STATE_FAILED] = "failed",
4508 [LINK_STATE_LINGER] = "linger",
4509 };
4510
4511 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
4512
4513 int log_link_message_full_errno(Link *link, sd_netlink_message *m, int level, int err, const char *msg) {
4514 const char *err_msg = NULL;
4515
4516 (void) sd_netlink_message_read_string(m, NLMSGERR_ATTR_MSG, &err_msg);
4517 return log_link_full(link, level, err,
4518 "%s: %s%s%s%m",
4519 msg,
4520 strempty(err_msg),
4521 err_msg && !endswith(err_msg, ".") ? "." : "",
4522 err_msg ? " " : "");
4523 }
Unnamed repository; edit this file 'description' to name the repository.