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network: do not change to configuring state needlessly
[thirdparty/systemd.git] / src / network / networkd-link.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <netinet/in.h>
4 #include <linux/if.h>
5 #include <unistd.h>
6
7 #include "alloc-util.h"
8 #include "bus-util.h"
9 #include "dhcp-identifier.h"
10 #include "dhcp-lease-internal.h"
11 #include "env-file.h"
12 #include "fd-util.h"
13 #include "fileio.h"
14 #include "missing_network.h"
15 #include "netdev/bond.h"
16 #include "netdev/bridge.h"
17 #include "netdev/ipvlan.h"
18 #include "netdev/vrf.h"
19 #include "netlink-util.h"
20 #include "network-internal.h"
21 #include "networkd-can.h"
22 #include "networkd-dhcp-server.h"
23 #include "networkd-dhcp4.h"
24 #include "networkd-dhcp6.h"
25 #include "networkd-ipv4ll.h"
26 #include "networkd-ipv6-proxy-ndp.h"
27 #include "networkd-link-bus.h"
28 #include "networkd-link.h"
29 #include "networkd-lldp-tx.h"
30 #include "networkd-manager.h"
31 #include "networkd-ndisc.h"
32 #include "networkd-neighbor.h"
33 #include "networkd-radv.h"
34 #include "networkd-routing-policy-rule.h"
35 #include "set.h"
36 #include "socket-util.h"
37 #include "stdio-util.h"
38 #include "string-table.h"
39 #include "strv.h"
40 #include "sysctl-util.h"
41 #include "tmpfile-util.h"
42 #include "udev-util.h"
43 #include "util.h"
44 #include "virt.h"
45
46 uint32_t link_get_vrf_table(Link *link) {
47 return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
48 }
49
50 uint32_t link_get_dhcp_route_table(Link *link) {
51 /* When the interface is part of an VRF use the VRFs routing table, unless
52 * another table is explicitly specified. */
53 if (link->network->dhcp_route_table_set)
54 return link->network->dhcp_route_table;
55 return link_get_vrf_table(link);
56 }
57
58 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
59 if (link->network->ipv6_accept_ra_route_table_set)
60 return link->network->ipv6_accept_ra_route_table;
61 return link_get_vrf_table(link);
62 }
63
64 DUID* link_get_duid(Link *link) {
65 if (link->network->duid.type != _DUID_TYPE_INVALID)
66 return &link->network->duid;
67 else
68 return &link->manager->duid;
69 }
70
71 int link_sysctl_ipv6_enabled(Link *link) {
72 _cleanup_free_ char *value = NULL;
73 int r;
74
75 assert(link);
76 assert(link->ifname);
77
78 if (link->sysctl_ipv6_enabled >= 0)
79 return link->sysctl_ipv6_enabled;
80
81 const char *ifname = link->ifname; /* work around bogus gcc warning */
82 r = sysctl_read_ip_property(AF_INET6, ifname, "disable_ipv6", &value);
83 if (r < 0)
84 return log_link_warning_errno(link, r,
85 "Failed to read net.ipv6.conf.%s.disable_ipv6 sysctl property: %m",
86 ifname);
87
88 link->sysctl_ipv6_enabled = value[0] == '0';
89 return link->sysctl_ipv6_enabled;
90 }
91
92 static bool link_dhcp6_enabled(Link *link) {
93 assert(link);
94
95 if (!socket_ipv6_is_supported())
96 return false;
97
98 if (link->flags & IFF_LOOPBACK)
99 return false;
100
101 if (!link->network)
102 return false;
103
104 if (link->network->bond)
105 return false;
106
107 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
108 return false;
109
110 if (link_sysctl_ipv6_enabled(link) == 0)
111 return false;
112
113 return link->network->dhcp & ADDRESS_FAMILY_IPV6;
114 }
115
116 static bool link_dhcp4_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 (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
129 return false;
130
131 return link->network->dhcp & ADDRESS_FAMILY_IPV4;
132 }
133
134 static bool link_dhcp4_server_enabled(Link *link) {
135 assert(link);
136
137 if (link->flags & IFF_LOOPBACK)
138 return false;
139
140 if (!link->network)
141 return false;
142
143 if (link->network->bond)
144 return false;
145
146 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
147 return false;
148
149 return link->network->dhcp_server;
150 }
151
152 bool link_ipv4ll_enabled(Link *link, AddressFamilyBoolean mask) {
153 assert(link);
154 assert((mask & ~(ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) == 0);
155
156 if (link->flags & IFF_LOOPBACK)
157 return false;
158
159 if (!link->network)
160 return false;
161
162 if (STRPTR_IN_SET(link->kind,
163 "vrf", "wireguard", "ipip", "gre", "ip6gre","ip6tnl", "sit", "vti",
164 "vti6", "can", "vcan", "vxcan", "nlmon", "xfrm"))
165 return false;
166
167 /* L3 or L3S mode do not support ARP. */
168 if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S))
169 return false;
170
171 if (link->network->bond)
172 return false;
173
174 return link->network->link_local & mask;
175 }
176
177 static bool link_ipv6ll_enabled(Link *link) {
178 assert(link);
179
180 if (!socket_ipv6_is_supported())
181 return false;
182
183 if (link->flags & IFF_LOOPBACK)
184 return false;
185
186 if (!link->network)
187 return false;
188
189 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "sit", "vti", "can", "vcan", "vxcan", "nlmon"))
190 return false;
191
192 if (link->network->bond)
193 return false;
194
195 if (link_sysctl_ipv6_enabled(link) == 0)
196 return false;
197
198 return link->network->link_local & ADDRESS_FAMILY_IPV6;
199 }
200
201 static bool link_ipv6_enabled(Link *link) {
202 assert(link);
203
204 if (!socket_ipv6_is_supported())
205 return false;
206
207 if (link->network->bond)
208 return false;
209
210 if (link_sysctl_ipv6_enabled(link) == 0)
211 return false;
212
213 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
214 return false;
215
216 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
217 return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
218 }
219
220 static bool link_radv_enabled(Link *link) {
221 assert(link);
222
223 if (!link_ipv6ll_enabled(link))
224 return false;
225
226 return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
227 }
228
229 static bool link_ipv4_forward_enabled(Link *link) {
230 assert(link);
231
232 if (link->flags & IFF_LOOPBACK)
233 return false;
234
235 if (!link->network)
236 return false;
237
238 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
239 return false;
240
241 return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
242 }
243
244 static bool link_ipv6_forward_enabled(Link *link) {
245 assert(link);
246
247 if (!socket_ipv6_is_supported())
248 return false;
249
250 if (link->flags & IFF_LOOPBACK)
251 return false;
252
253 if (!link->network)
254 return false;
255
256 if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
257 return false;
258
259 if (link_sysctl_ipv6_enabled(link) == 0)
260 return false;
261
262 return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
263 }
264
265 static bool link_proxy_arp_enabled(Link *link) {
266 assert(link);
267
268 if (link->flags & IFF_LOOPBACK)
269 return false;
270
271 if (!link->network)
272 return false;
273
274 if (link->network->proxy_arp < 0)
275 return false;
276
277 return true;
278 }
279
280 static bool link_ipv6_accept_ra_enabled(Link *link) {
281 assert(link);
282
283 if (!socket_ipv6_is_supported())
284 return false;
285
286 if (link->flags & IFF_LOOPBACK)
287 return false;
288
289 if (!link->network)
290 return false;
291
292 if (!link_ipv6ll_enabled(link))
293 return false;
294
295 /* If unset use system default (enabled if local forwarding is disabled.
296 * disabled if local forwarding is enabled).
297 * If set, ignore or enforce RA independent of local forwarding state.
298 */
299 if (link->network->ipv6_accept_ra < 0)
300 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
301 return !link_ipv6_forward_enabled(link);
302 else if (link->network->ipv6_accept_ra > 0)
303 /* accept RA even if ip_forward is enabled */
304 return true;
305 else
306 /* ignore RA */
307 return false;
308 }
309
310 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
311 assert(link);
312
313 if (!socket_ipv6_is_supported())
314 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
315
316 if (link->flags & IFF_LOOPBACK)
317 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
318
319 if (!link->network)
320 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
321
322 return link->network->ipv6_privacy_extensions;
323 }
324
325 static int link_enable_ipv6(Link *link) {
326 bool disabled;
327 int r;
328
329 if (link->flags & IFF_LOOPBACK)
330 return 0;
331
332 disabled = !link_ipv6_enabled(link);
333
334 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", disabled);
335 if (r < 0)
336 log_link_warning_errno(link, r, "Cannot %s IPv6: %m", enable_disable(!disabled));
337 else
338 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
339
340 return 0;
341 }
342
343 static bool link_is_enslaved(Link *link) {
344 if (link->flags & IFF_SLAVE)
345 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
346 return true;
347
348 if (!link->network)
349 return false;
350
351 if (link->master_ifindex > 0 && link->network->bridge)
352 return true;
353
354 /* TODO: add conditions for other netdevs. */
355
356 return false;
357 }
358
359 static void link_update_master_operstate(Link *link, NetDev *netdev) {
360 Link *master;
361
362 if (!netdev)
363 return;
364
365 if (link_get(link->manager, netdev->ifindex, &master) < 0)
366 return;
367
368 link_update_operstate(master, true);
369 }
370
371 void link_update_operstate(Link *link, bool also_update_master) {
372 LinkOperationalState operstate;
373 LinkCarrierState carrier_state;
374 LinkAddressState address_state;
375 _cleanup_strv_free_ char **p = NULL;
376 uint8_t scope = RT_SCOPE_NOWHERE;
377 bool changed = false;
378 Address *address;
379 Iterator i;
380
381 assert(link);
382
383 if (link->kernel_operstate == IF_OPER_DORMANT)
384 carrier_state = LINK_CARRIER_STATE_DORMANT;
385 else if (link_has_carrier(link)) {
386 if (link_is_enslaved(link))
387 carrier_state = LINK_CARRIER_STATE_ENSLAVED;
388 else
389 carrier_state = LINK_CARRIER_STATE_CARRIER;
390 } else if (link->flags & IFF_UP)
391 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
392 else
393 carrier_state = LINK_CARRIER_STATE_OFF;
394
395 if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
396 Link *slave;
397
398 SET_FOREACH(slave, link->slaves, i) {
399 link_update_operstate(slave, false);
400
401 if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
402 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
403 }
404 }
405
406 SET_FOREACH(address, link->addresses, i) {
407 if (!address_is_ready(address))
408 continue;
409
410 if (address->scope < scope)
411 scope = address->scope;
412 }
413
414 /* for operstate we also take foreign addresses into account */
415 SET_FOREACH(address, link->addresses_foreign, i) {
416 if (!address_is_ready(address))
417 continue;
418
419 if (address->scope < scope)
420 scope = address->scope;
421 }
422
423 if (scope < RT_SCOPE_SITE)
424 /* universally accessible addresses found */
425 address_state = LINK_ADDRESS_STATE_ROUTABLE;
426 else if (scope < RT_SCOPE_HOST)
427 /* only link or site local addresses found */
428 address_state = LINK_ADDRESS_STATE_DEGRADED;
429 else
430 /* no useful addresses found */
431 address_state = LINK_ADDRESS_STATE_OFF;
432
433 /* Mapping of address and carrier state vs operational state
434 * carrier state
435 * | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
436 * ------------------------------------------------------------------------------
437 * off | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
438 * address_state degraded | off | no-carrier | dormant | degraded-carrier | degraded | enslaved
439 * routable | off | no-carrier | dormant | degraded-carrier | routable | routable
440 */
441
442 if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
443 operstate = (LinkOperationalState) carrier_state;
444 else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
445 operstate = LINK_OPERSTATE_ROUTABLE;
446 else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
447 operstate = LINK_OPERSTATE_DEGRADED;
448 else
449 operstate = LINK_OPERSTATE_ENSLAVED;
450
451 if (link->carrier_state != carrier_state) {
452 link->carrier_state = carrier_state;
453 changed = true;
454 if (strv_extend(&p, "CarrierState") < 0)
455 log_oom();
456 }
457
458 if (link->address_state != address_state) {
459 link->address_state = address_state;
460 changed = true;
461 if (strv_extend(&p, "AddressState") < 0)
462 log_oom();
463 }
464
465 if (link->operstate != operstate) {
466 link->operstate = operstate;
467 changed = true;
468 if (strv_extend(&p, "OperationalState") < 0)
469 log_oom();
470 }
471
472 if (p)
473 link_send_changed_strv(link, p);
474 if (changed)
475 link_dirty(link);
476
477 if (also_update_master && link->network) {
478 link_update_master_operstate(link, link->network->bond);
479 link_update_master_operstate(link, link->network->bridge);
480 }
481 }
482
483 #define FLAG_STRING(string, flag, old, new) \
484 (((old ^ new) & flag) \
485 ? ((old & flag) ? (" -" string) : (" +" string)) \
486 : "")
487
488 static int link_update_flags(Link *link, sd_netlink_message *m, bool force_update_operstate) {
489 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
490 uint8_t operstate;
491 int r;
492
493 assert(link);
494
495 r = sd_rtnl_message_link_get_flags(m, &flags);
496 if (r < 0)
497 return log_link_warning_errno(link, r, "Could not get link flags: %m");
498
499 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
500 if (r < 0)
501 /* if we got a message without operstate, take it to mean
502 the state was unchanged */
503 operstate = link->kernel_operstate;
504
505 if (!force_update_operstate && (link->flags == flags) && (link->kernel_operstate == operstate))
506 return 0;
507
508 if (link->flags != flags) {
509 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",
510 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
511 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
512 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
513 FLAG_STRING("UP", IFF_UP, link->flags, flags),
514 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
515 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
516 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
517 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
518 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
519 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
520 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
521 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
522 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
523 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
524 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
525 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
526 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
527 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
528 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
529
530 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
531 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
532 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
533 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
534 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
535 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
536 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
537 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
538
539 /* link flags are currently at most 18 bits, let's align to
540 * printing 20 */
541 if (unknown_flags_added)
542 log_link_debug(link,
543 "Unknown link flags gained: %#.5x (ignoring)",
544 unknown_flags_added);
545
546 if (unknown_flags_removed)
547 log_link_debug(link,
548 "Unknown link flags lost: %#.5x (ignoring)",
549 unknown_flags_removed);
550 }
551
552 link->flags = flags;
553 link->kernel_operstate = operstate;
554
555 link_update_operstate(link, true);
556
557 return 0;
558 }
559
560 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
561 _cleanup_(link_unrefp) Link *link = NULL;
562 uint16_t type;
563 const char *ifname, *kind = NULL;
564 int r, ifindex;
565 unsigned short iftype;
566
567 assert(manager);
568 assert(message);
569 assert(ret);
570
571 /* check for link kind */
572 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
573 if (r == 0) {
574 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
575 r = sd_netlink_message_exit_container(message);
576 if (r < 0)
577 return r;
578 }
579
580 r = sd_netlink_message_get_type(message, &type);
581 if (r < 0)
582 return r;
583 else if (type != RTM_NEWLINK)
584 return -EINVAL;
585
586 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
587 if (r < 0)
588 return r;
589 else if (ifindex <= 0)
590 return -EINVAL;
591
592 r = sd_rtnl_message_link_get_type(message, &iftype);
593 if (r < 0)
594 return r;
595
596 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
597 if (r < 0)
598 return r;
599
600 link = new(Link, 1);
601 if (!link)
602 return -ENOMEM;
603
604 *link = (Link) {
605 .n_ref = 1,
606 .manager = manager,
607 .state = LINK_STATE_PENDING,
608 .rtnl_extended_attrs = true,
609 .ifindex = ifindex,
610 .iftype = iftype,
611 .sysctl_ipv6_enabled = -1,
612 };
613
614 link->ifname = strdup(ifname);
615 if (!link->ifname)
616 return -ENOMEM;
617
618 if (kind) {
619 link->kind = strdup(kind);
620 if (!link->kind)
621 return -ENOMEM;
622 }
623
624 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
625 if (r < 0)
626 log_link_debug_errno(link, r, "New device has no master, continuing without");
627
628 r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
629 if (r < 0)
630 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
631
632 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
633 return -ENOMEM;
634
635 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
636 return -ENOMEM;
637
638 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
639 return -ENOMEM;
640
641 r = hashmap_ensure_allocated(&manager->links, NULL);
642 if (r < 0)
643 return r;
644
645 r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
646 if (r < 0)
647 return r;
648
649 r = link_update_flags(link, message, false);
650 if (r < 0)
651 return r;
652
653 *ret = TAKE_PTR(link);
654
655 return 0;
656 }
657
658 static Link *link_free(Link *link) {
659 Address *address;
660
661 assert(link);
662
663 link->routes = set_free_with_destructor(link->routes, route_free);
664 link->routes_foreign = set_free_with_destructor(link->routes_foreign, route_free);
665
666 link->addresses = set_free_with_destructor(link->addresses, address_free);
667 link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free);
668
669 while ((address = link->pool_addresses)) {
670 LIST_REMOVE(addresses, link->pool_addresses, address);
671 address_free(address);
672 }
673
674 sd_dhcp_server_unref(link->dhcp_server);
675 sd_dhcp_client_unref(link->dhcp_client);
676 sd_dhcp_lease_unref(link->dhcp_lease);
677
678 link_lldp_emit_stop(link);
679
680 free(link->lease_file);
681
682 sd_lldp_unref(link->lldp);
683 free(link->lldp_file);
684
685 ndisc_flush(link);
686
687 sd_ipv4ll_unref(link->ipv4ll);
688 sd_dhcp6_client_unref(link->dhcp6_client);
689 sd_ndisc_unref(link->ndisc);
690 sd_radv_unref(link->radv);
691
692 free(link->ifname);
693 free(link->kind);
694
695 (void) unlink(link->state_file);
696 free(link->state_file);
697
698 sd_device_unref(link->sd_device);
699
700 hashmap_free(link->bound_to_links);
701 hashmap_free(link->bound_by_links);
702
703 set_free_with_destructor(link->slaves, link_unref);
704
705 network_unref(link->network);
706
707 return mfree(link);
708 }
709
710 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
711
712 int link_get(Manager *m, int ifindex, Link **ret) {
713 Link *link;
714
715 assert(m);
716 assert(ifindex);
717 assert(ret);
718
719 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
720 if (!link)
721 return -ENODEV;
722
723 *ret = link;
724
725 return 0;
726 }
727
728 void link_set_state(Link *link, LinkState state) {
729 assert(link);
730
731 if (link->state == state)
732 return;
733
734 log_link_debug(link, "State changed: %s -> %s",
735 link_state_to_string(link->state),
736 link_state_to_string(state));
737
738 link->state = state;
739
740 link_send_changed(link, "AdministrativeState", NULL);
741 }
742
743 static void link_enter_unmanaged(Link *link) {
744 assert(link);
745
746 link_set_state(link, LINK_STATE_UNMANAGED);
747
748 link_dirty(link);
749 }
750
751 int link_stop_clients(Link *link, bool may_keep_dhcp) {
752 int r = 0, k;
753
754 assert(link);
755 assert(link->manager);
756 assert(link->manager->event);
757
758 dhcp4_release_old_lease(link);
759
760 if (link->dhcp_client && (!may_keep_dhcp || !link->network ||
761 !FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP))) {
762 k = sd_dhcp_client_stop(link->dhcp_client);
763 if (k < 0)
764 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
765 }
766
767 if (link->ipv4ll) {
768 k = sd_ipv4ll_stop(link->ipv4ll);
769 if (k < 0)
770 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
771 }
772
773 if (link->dhcp6_client) {
774 k = sd_dhcp6_client_stop(link->dhcp6_client);
775 if (k < 0)
776 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
777 }
778
779 if (link->ndisc) {
780 k = sd_ndisc_stop(link->ndisc);
781 if (k < 0)
782 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
783 }
784
785 if (link->radv) {
786 k = sd_radv_stop(link->radv);
787 if (k < 0)
788 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
789 }
790
791 link_lldp_emit_stop(link);
792 return r;
793 }
794
795 void link_enter_failed(Link *link) {
796 assert(link);
797
798 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
799 return;
800
801 log_link_warning(link, "Failed");
802
803 link_set_state(link, LINK_STATE_FAILED);
804
805 link_stop_clients(link, false);
806
807 link_dirty(link);
808 }
809
810 static int link_join_netdevs_after_configured(Link *link) {
811 NetDev *netdev;
812 Iterator i;
813 int r;
814
815 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
816 if (netdev->ifindex > 0)
817 /* Assume already enslaved. */
818 continue;
819
820 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
821 continue;
822
823 log_struct(LOG_DEBUG,
824 LOG_LINK_INTERFACE(link),
825 LOG_NETDEV_INTERFACE(netdev),
826 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
827
828 r = netdev_join(netdev, link, NULL);
829 if (r < 0)
830 return log_struct_errno(LOG_WARNING, r,
831 LOG_LINK_INTERFACE(link),
832 LOG_NETDEV_INTERFACE(netdev),
833 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
834 }
835
836 return 0;
837 }
838
839 static void link_enter_configured(Link *link) {
840 assert(link);
841 assert(link->network);
842
843 if (link->state != LINK_STATE_CONFIGURING)
844 return;
845
846 log_link_info(link, "Configured");
847
848 link_set_state(link, LINK_STATE_CONFIGURED);
849
850 (void) link_join_netdevs_after_configured(link);
851
852 link_dirty(link);
853 }
854
855 static int link_request_set_routing_policy_rule(Link *link) {
856 RoutingPolicyRule *rule, *rrule = NULL;
857 int r;
858
859 assert(link);
860 assert(link->network);
861
862 link->routing_policy_rules_configured = false;
863
864 LIST_FOREACH(rules, rule, link->network->rules) {
865 r = routing_policy_rule_get(link->manager, rule, &rrule);
866 if (r >= 0) {
867 if (r == 0)
868 (void) routing_policy_rule_make_local(link->manager, rrule);
869 continue;
870 }
871
872 r = routing_policy_rule_configure(rule, link, NULL);
873 if (r < 0) {
874 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
875 link_enter_failed(link);
876 return r;
877 }
878 if (r > 0)
879 link->routing_policy_rule_messages++;
880 }
881
882 routing_policy_rule_purge(link->manager, link);
883 if (link->routing_policy_rule_messages == 0) {
884 link->routing_policy_rules_configured = true;
885 link_check_ready(link);
886 } else {
887 log_link_debug(link, "Setting routing policy rules");
888 link_set_state(link, LINK_STATE_CONFIGURING);
889 }
890
891 return 0;
892 }
893
894 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
895 int r;
896
897 assert(link);
898 assert(link->route_messages > 0);
899 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
900 LINK_STATE_FAILED, LINK_STATE_LINGER));
901
902 link->route_messages--;
903
904 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
905 return 1;
906
907 r = sd_netlink_message_get_errno(m);
908 if (r < 0 && r != -EEXIST)
909 log_link_warning_errno(link, r, "Could not set route: %m");
910
911 if (link->route_messages == 0) {
912 log_link_debug(link, "Routes set");
913 link->static_routes_configured = true;
914 link_check_ready(link);
915 }
916
917 return 1;
918 }
919
920 int link_request_set_routes(Link *link) {
921 enum {
922 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
923 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
924 _PHASE_MAX
925 } phase;
926 Route *rt;
927 int r;
928
929 assert(link);
930 assert(link->network);
931 assert(link->addresses_configured);
932 assert(link->address_messages == 0);
933 assert(link->state != _LINK_STATE_INVALID);
934
935 link->static_routes_configured = false;
936
937 r = link_request_set_routing_policy_rule(link);
938 if (r < 0)
939 return r;
940
941 /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
942 for (phase = 0; phase < _PHASE_MAX; phase++)
943 LIST_FOREACH(routes, rt, link->network->static_routes) {
944
945 if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
946 continue;
947
948 r = route_configure(rt, link, route_handler);
949 if (r < 0) {
950 log_link_warning_errno(link, r, "Could not set routes: %m");
951 link_enter_failed(link);
952 return r;
953 }
954 if (r > 0)
955 link->route_messages++;
956 }
957
958 if (link->route_messages == 0) {
959 link->static_routes_configured = true;
960 link_check_ready(link);
961 } else {
962 log_link_debug(link, "Setting routes");
963 link_set_state(link, LINK_STATE_CONFIGURING);
964 }
965
966 return 0;
967 }
968
969 void link_check_ready(Link *link) {
970 Address *a;
971 Iterator i;
972
973 assert(link);
974
975 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
976 return;
977
978 if (!link->network)
979 return;
980
981 if (!link->addresses_configured)
982 return;
983
984 if (!link->neighbors_configured)
985 return;
986
987 SET_FOREACH(a, link->addresses, i)
988 if (!address_is_ready(a))
989 return;
990
991 if (!link->addresses_ready) {
992 link->addresses_ready = true;
993 link_request_set_routes(link);
994 return;
995 }
996
997 if (!link->static_routes_configured)
998 return;
999
1000 if (!link->routing_policy_rules_configured)
1001 return;
1002
1003 if (link_has_carrier(link) || !link->network->configure_without_carrier) {
1004
1005 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !(link->ipv4ll_address && link->ipv4ll_route))
1006 return;
1007
1008 if (link_ipv6ll_enabled(link) &&
1009 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
1010 return;
1011
1012 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
1013 !link->dhcp4_configured &&
1014 !link->dhcp6_configured &&
1015 !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address && link->ipv4ll_route))
1016 /* When DHCP is enabled, at least one protocol must provide an address, or
1017 * an IPv4ll fallback address must be configured. */
1018 return;
1019
1020 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
1021 return;
1022 }
1023
1024 if (link->state != LINK_STATE_CONFIGURED)
1025 link_enter_configured(link);
1026
1027 return;
1028 }
1029
1030 static int link_request_set_neighbors(Link *link) {
1031 Neighbor *neighbor;
1032 int r;
1033
1034 assert(link);
1035 assert(link->network);
1036 assert(link->state != _LINK_STATE_INVALID);
1037
1038 link->neighbors_configured = false;
1039
1040 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1041 r = neighbor_configure(neighbor, link, NULL);
1042 if (r < 0) {
1043 log_link_warning_errno(link, r, "Could not set neighbor: %m");
1044 link_enter_failed(link);
1045 return r;
1046 }
1047 }
1048
1049 if (link->neighbor_messages == 0) {
1050 link->neighbors_configured = true;
1051 link_check_ready(link);
1052 } else {
1053 log_link_debug(link, "Setting neighbors");
1054 link_set_state(link, LINK_STATE_CONFIGURING);
1055 }
1056
1057 return 0;
1058 }
1059
1060 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1061 int r;
1062
1063 assert(rtnl);
1064 assert(m);
1065 assert(link);
1066 assert(link->ifname);
1067 assert(link->address_messages > 0);
1068 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1069 LINK_STATE_FAILED, LINK_STATE_LINGER));
1070
1071 link->address_messages--;
1072
1073 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1074 return 1;
1075
1076 r = sd_netlink_message_get_errno(m);
1077 if (r < 0 && r != -EEXIST)
1078 log_link_warning_errno(link, r, "could not set address: %m");
1079 else if (r >= 0)
1080 manager_rtnl_process_address(rtnl, m, link->manager);
1081
1082 if (link->address_messages == 0) {
1083 log_link_debug(link, "Addresses set");
1084 link->addresses_configured = true;
1085 link_check_ready(link);
1086 }
1087
1088 return 1;
1089 }
1090
1091 static int link_set_bridge_fdb(Link *link) {
1092 FdbEntry *fdb_entry;
1093 int r;
1094
1095 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1096 r = fdb_entry_configure(link, fdb_entry);
1097 if (r < 0)
1098 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1099 }
1100
1101 return 0;
1102 }
1103
1104 static int link_request_set_addresses(Link *link) {
1105 AddressLabel *label;
1106 Address *ad;
1107 int r;
1108
1109 assert(link);
1110 assert(link->network);
1111 assert(link->state != _LINK_STATE_INVALID);
1112
1113 /* Reset all *_configured flags we are configuring. */
1114 link->addresses_configured = false;
1115 link->addresses_ready = false;
1116 link->neighbors_configured = false;
1117 link->static_routes_configured = false;
1118 link->routing_policy_rules_configured = false;
1119
1120 r = link_set_bridge_fdb(link);
1121 if (r < 0)
1122 return r;
1123
1124 r = link_request_set_neighbors(link);
1125 if (r < 0)
1126 return r;
1127
1128 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1129 bool update;
1130
1131 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1132
1133 r = address_configure(ad, link, address_handler, update);
1134 if (r < 0) {
1135 log_link_warning_errno(link, r, "Could not set addresses: %m");
1136 link_enter_failed(link);
1137 return r;
1138 }
1139 if (r > 0)
1140 link->address_messages++;
1141 }
1142
1143 LIST_FOREACH(labels, label, link->network->address_labels) {
1144 r = address_label_configure(label, link, NULL, false);
1145 if (r < 0) {
1146 log_link_warning_errno(link, r, "Could not set address label: %m");
1147 link_enter_failed(link);
1148 return r;
1149 }
1150
1151 link->address_label_messages++;
1152 }
1153
1154 /* now that we can figure out a default address for the dhcp server,
1155 start it */
1156 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1157 r = dhcp4_server_configure(link);
1158 if (r < 0) {
1159 link_enter_failed(link);
1160 return r;
1161 }
1162 log_link_debug(link, "Offering DHCPv4 leases");
1163 }
1164
1165 if (link->address_messages == 0) {
1166 link->addresses_configured = true;
1167 link_check_ready(link);
1168 } else {
1169 log_link_debug(link, "Setting addresses");
1170 link_set_state(link, LINK_STATE_CONFIGURING);
1171 }
1172
1173 return 0;
1174 }
1175
1176 static int link_set_bridge_vlan(Link *link) {
1177 int r;
1178
1179 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1180 if (r < 0)
1181 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1182
1183 return r;
1184 }
1185
1186 static int link_set_proxy_arp(Link *link) {
1187 int r;
1188
1189 if (!link_proxy_arp_enabled(link))
1190 return 0;
1191
1192 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1193 if (r < 0)
1194 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1195
1196 return 0;
1197 }
1198
1199 static int link_configure_after_setting_mtu(Link *link);
1200
1201 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1202 int r;
1203
1204 assert(m);
1205 assert(link);
1206 assert(link->ifname);
1207
1208 link->setting_mtu = false;
1209
1210 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1211 return 1;
1212
1213 r = sd_netlink_message_get_errno(m);
1214 if (r < 0) {
1215 log_link_warning_errno(link, r, "Could not set MTU: %m");
1216 return 1;
1217 }
1218
1219 log_link_debug(link, "Setting MTU done.");
1220
1221 if (link->state == LINK_STATE_INITIALIZED)
1222 (void) link_configure_after_setting_mtu(link);
1223
1224 return 1;
1225 }
1226
1227 int link_set_mtu(Link *link, uint32_t mtu) {
1228 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1229 int r;
1230
1231 assert(link);
1232 assert(link->manager);
1233 assert(link->manager->rtnl);
1234
1235 if (mtu == 0 || link->setting_mtu)
1236 return 0;
1237
1238 if (link->mtu == mtu)
1239 return 0;
1240
1241 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1242
1243 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1244 if (r < 0)
1245 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1246
1247 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1248 * for this interface, then disable IPv6 else enable it. */
1249 (void) link_enable_ipv6(link);
1250
1251 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1252 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1253 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1254
1255 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1256 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1257
1258 mtu = IPV6_MIN_MTU;
1259 }
1260
1261 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1262 if (r < 0)
1263 return log_link_error_errno(link, r, "Could not append MTU: %m");
1264
1265 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1266 link_netlink_destroy_callback, link);
1267 if (r < 0)
1268 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1269
1270 link_ref(link);
1271 link->setting_mtu = true;
1272
1273 return 0;
1274 }
1275
1276 static bool link_reduces_vlan_mtu(Link *link) {
1277 /* See netif_reduces_vlan_mtu() in kernel. */
1278 return streq_ptr(link->kind, "macsec");
1279 }
1280
1281 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1282 uint32_t mtu = 0;
1283 NetDev *dev;
1284 Iterator i;
1285
1286 HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1287 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1288 /* See vlan_dev_change_mtu() in kernel. */
1289 mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1290
1291 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1292 /* See macvlan_change_mtu() in kernel. */
1293 mtu = dev->mtu;
1294
1295 return mtu;
1296 }
1297
1298 static int link_configure_mtu(Link *link) {
1299 uint32_t mtu;
1300
1301 assert(link);
1302 assert(link->network);
1303
1304 if (link->network->mtu > 0)
1305 return link_set_mtu(link, link->network->mtu);
1306
1307 mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1308 if (link->mtu >= mtu)
1309 return 0;
1310
1311 log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1312 "If it is not desired, then please explicitly specify MTUBytes= setting.",
1313 link->mtu, mtu);
1314
1315 return link_set_mtu(link, mtu);
1316 }
1317
1318 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1319 int r;
1320
1321 assert(m);
1322 assert(link);
1323 assert(link->ifname);
1324
1325 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1326 return 1;
1327
1328 r = sd_netlink_message_get_errno(m);
1329 if (r < 0)
1330 log_link_warning_errno(link, r, "Could not set link flags: %m");
1331
1332 return 1;
1333 }
1334
1335 static int link_set_flags(Link *link) {
1336 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1337 unsigned ifi_change = 0;
1338 unsigned ifi_flags = 0;
1339 int r;
1340
1341 assert(link);
1342 assert(link->manager);
1343 assert(link->manager->rtnl);
1344
1345 if (link->flags & IFF_LOOPBACK)
1346 return 0;
1347
1348 if (!link->network)
1349 return 0;
1350
1351 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1352 return 0;
1353
1354 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1355 if (r < 0)
1356 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1357
1358 if (link->network->arp >= 0) {
1359 ifi_change |= IFF_NOARP;
1360 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1361 }
1362
1363 if (link->network->multicast >= 0) {
1364 ifi_change |= IFF_MULTICAST;
1365 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1366 }
1367
1368 if (link->network->allmulticast >= 0) {
1369 ifi_change |= IFF_ALLMULTI;
1370 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1371 }
1372
1373 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1374 if (r < 0)
1375 return log_link_error_errno(link, r, "Could not set link flags: %m");
1376
1377 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1378 link_netlink_destroy_callback, link);
1379 if (r < 0)
1380 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1381
1382 link_ref(link);
1383
1384 return 0;
1385 }
1386
1387 static int link_acquire_ipv6_conf(Link *link) {
1388 int r;
1389
1390 assert(link);
1391
1392 if (link_ipv6_accept_ra_enabled(link)) {
1393 assert(link->ndisc);
1394
1395 log_link_debug(link, "Discovering IPv6 routers");
1396
1397 r = sd_ndisc_start(link->ndisc);
1398 if (r < 0 && r != -EBUSY)
1399 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1400 }
1401
1402 if (link_radv_enabled(link)) {
1403 assert(link->radv);
1404 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1405
1406 log_link_debug(link, "Starting IPv6 Router Advertisements");
1407
1408 r = sd_radv_start(link->radv);
1409 if (r < 0 && r != -EBUSY)
1410 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1411 }
1412
1413 (void) dhcp6_request_prefix_delegation(link);
1414
1415 return 0;
1416 }
1417
1418 static int link_acquire_ipv4_conf(Link *link) {
1419 int r;
1420
1421 assert(link);
1422 assert(link->manager);
1423 assert(link->manager->event);
1424
1425 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1426 assert(link->ipv4ll);
1427
1428 log_link_debug(link, "Acquiring IPv4 link-local address");
1429
1430 r = sd_ipv4ll_start(link->ipv4ll);
1431 if (r < 0)
1432 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1433 }
1434
1435 if (link_dhcp4_enabled(link)) {
1436 assert(link->dhcp_client);
1437
1438 log_link_debug(link, "Acquiring DHCPv4 lease");
1439
1440 r = sd_dhcp_client_start(link->dhcp_client);
1441 if (r < 0)
1442 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1443 }
1444
1445 return 0;
1446 }
1447
1448 static int link_acquire_conf(Link *link) {
1449 int r;
1450
1451 assert(link);
1452
1453 r = link_acquire_ipv4_conf(link);
1454 if (r < 0)
1455 return r;
1456
1457 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1458 r = link_acquire_ipv6_conf(link);
1459 if (r < 0)
1460 return r;
1461 }
1462
1463 if (link_lldp_emit_enabled(link)) {
1464 r = link_lldp_emit_start(link);
1465 if (r < 0)
1466 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1467 }
1468
1469 return 0;
1470 }
1471
1472 bool link_has_carrier(Link *link) {
1473 /* see Documentation/networking/operstates.txt in the kernel sources */
1474
1475 if (link->kernel_operstate == IF_OPER_UP)
1476 return true;
1477
1478 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1479 /* operstate may not be implemented, so fall back to flags */
1480 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1481 !FLAGS_SET(link->flags, IFF_DORMANT))
1482 return true;
1483
1484 return false;
1485 }
1486
1487 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1488 int r;
1489
1490 assert(link);
1491
1492 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1493 return 1;
1494
1495 r = sd_netlink_message_get_errno(m);
1496 if (r < 0)
1497 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1498
1499 return 1;
1500 }
1501
1502 static int link_configure_addrgen_mode(Link *link) {
1503 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1504 uint8_t ipv6ll_mode;
1505 int r;
1506
1507 assert(link);
1508 assert(link->network);
1509 assert(link->manager);
1510 assert(link->manager->rtnl);
1511
1512 if (!socket_ipv6_is_supported())
1513 return 0;
1514
1515 log_link_debug(link, "Setting address genmode for link");
1516
1517 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1518 if (r < 0)
1519 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1520
1521 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1522 if (r < 0)
1523 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1524
1525 r = sd_netlink_message_open_container(req, AF_INET6);
1526 if (r < 0)
1527 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1528
1529 if (!link_ipv6ll_enabled(link))
1530 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1531 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1532 /* The file may not exist. And event if it exists, when stable_secret is unset,
1533 * reading the file fails with EIO. */
1534 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1535 else
1536 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1537
1538 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1539 if (r < 0)
1540 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1541
1542 r = sd_netlink_message_close_container(req);
1543 if (r < 0)
1544 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1545
1546 r = sd_netlink_message_close_container(req);
1547 if (r < 0)
1548 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1549
1550 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1551 link_netlink_destroy_callback, link);
1552 if (r < 0)
1553 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1554
1555 link_ref(link);
1556
1557 return 0;
1558 }
1559
1560 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1561 int r;
1562
1563 assert(link);
1564
1565 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1566 return 1;
1567
1568 r = sd_netlink_message_get_errno(m);
1569 if (r < 0)
1570 /* we warn but don't fail the link, as it may be brought up later */
1571 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1572
1573 return 1;
1574 }
1575
1576 static int link_up(Link *link) {
1577 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1578 int r;
1579
1580 assert(link);
1581 assert(link->network);
1582 assert(link->manager);
1583 assert(link->manager->rtnl);
1584
1585 log_link_debug(link, "Bringing link up");
1586
1587 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1588 if (r < 0)
1589 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1590
1591 /* set it free if not enslaved with networkd */
1592 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1593 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1594 if (r < 0)
1595 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1596 }
1597
1598 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1599 if (r < 0)
1600 return log_link_error_errno(link, r, "Could not set link flags: %m");
1601
1602 if (link->network->mac) {
1603 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1604 if (r < 0)
1605 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1606 }
1607
1608 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1609 link_netlink_destroy_callback, link);
1610 if (r < 0)
1611 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1612
1613 link_ref(link);
1614
1615 return 0;
1616 }
1617
1618 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1619 int r;
1620
1621 assert(link);
1622
1623 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1624 return 1;
1625
1626 r = sd_netlink_message_get_errno(m);
1627 if (r < 0)
1628 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1629
1630 return 1;
1631 }
1632
1633 int link_down(Link *link, link_netlink_message_handler_t callback) {
1634 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1635 int r;
1636
1637 assert(link);
1638 assert(link->manager);
1639 assert(link->manager->rtnl);
1640
1641 log_link_debug(link, "Bringing link down");
1642
1643 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1644 RTM_SETLINK, link->ifindex);
1645 if (r < 0)
1646 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1647
1648 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1649 if (r < 0)
1650 return log_link_error_errno(link, r, "Could not set link flags: %m");
1651
1652 r = netlink_call_async(link->manager->rtnl, NULL, req,
1653 callback ?: link_down_handler,
1654 link_netlink_destroy_callback, link);
1655 if (r < 0)
1656 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1657
1658 link_ref(link);
1659
1660 return 0;
1661 }
1662
1663 static int link_handle_bound_to_list(Link *link) {
1664 Link *l;
1665 Iterator i;
1666 int r;
1667 bool required_up = false;
1668 bool link_is_up = false;
1669
1670 assert(link);
1671
1672 if (hashmap_isempty(link->bound_to_links))
1673 return 0;
1674
1675 if (link->flags & IFF_UP)
1676 link_is_up = true;
1677
1678 HASHMAP_FOREACH (l, link->bound_to_links, i)
1679 if (link_has_carrier(l)) {
1680 required_up = true;
1681 break;
1682 }
1683
1684 if (!required_up && link_is_up) {
1685 r = link_down(link, NULL);
1686 if (r < 0)
1687 return r;
1688 } else if (required_up && !link_is_up) {
1689 r = link_up(link);
1690 if (r < 0)
1691 return r;
1692 }
1693
1694 return 0;
1695 }
1696
1697 static int link_handle_bound_by_list(Link *link) {
1698 Iterator i;
1699 Link *l;
1700 int r;
1701
1702 assert(link);
1703
1704 if (hashmap_isempty(link->bound_by_links))
1705 return 0;
1706
1707 HASHMAP_FOREACH (l, link->bound_by_links, i) {
1708 r = link_handle_bound_to_list(l);
1709 if (r < 0)
1710 return r;
1711 }
1712
1713 return 0;
1714 }
1715
1716 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1717 int r;
1718
1719 assert(link);
1720 assert(carrier);
1721
1722 if (link == carrier)
1723 return 0;
1724
1725 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1726 return 0;
1727
1728 r = hashmap_ensure_allocated(h, NULL);
1729 if (r < 0)
1730 return r;
1731
1732 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1733 if (r < 0)
1734 return r;
1735
1736 return 0;
1737 }
1738
1739 static int link_new_bound_by_list(Link *link) {
1740 Manager *m;
1741 Link *carrier;
1742 Iterator i;
1743 int r;
1744 bool list_updated = false;
1745
1746 assert(link);
1747 assert(link->manager);
1748
1749 m = link->manager;
1750
1751 HASHMAP_FOREACH(carrier, m->links, i) {
1752 if (!carrier->network)
1753 continue;
1754
1755 if (strv_isempty(carrier->network->bind_carrier))
1756 continue;
1757
1758 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
1759 r = link_put_carrier(link, carrier, &link->bound_by_links);
1760 if (r < 0)
1761 return r;
1762
1763 list_updated = true;
1764 }
1765 }
1766
1767 if (list_updated)
1768 link_dirty(link);
1769
1770 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
1771 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1772 if (r < 0)
1773 return r;
1774
1775 link_dirty(carrier);
1776 }
1777
1778 return 0;
1779 }
1780
1781 static int link_new_bound_to_list(Link *link) {
1782 Manager *m;
1783 Link *carrier;
1784 Iterator i;
1785 int r;
1786 bool list_updated = false;
1787
1788 assert(link);
1789 assert(link->manager);
1790
1791 if (!link->network)
1792 return 0;
1793
1794 if (strv_isempty(link->network->bind_carrier))
1795 return 0;
1796
1797 m = link->manager;
1798
1799 HASHMAP_FOREACH (carrier, m->links, i) {
1800 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
1801 r = link_put_carrier(link, carrier, &link->bound_to_links);
1802 if (r < 0)
1803 return r;
1804
1805 list_updated = true;
1806 }
1807 }
1808
1809 if (list_updated)
1810 link_dirty(link);
1811
1812 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
1813 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
1814 if (r < 0)
1815 return r;
1816
1817 link_dirty(carrier);
1818 }
1819
1820 return 0;
1821 }
1822
1823 static int link_new_carrier_maps(Link *link) {
1824 int r;
1825
1826 r = link_new_bound_by_list(link);
1827 if (r < 0)
1828 return r;
1829
1830 r = link_handle_bound_by_list(link);
1831 if (r < 0)
1832 return r;
1833
1834 r = link_new_bound_to_list(link);
1835 if (r < 0)
1836 return r;
1837
1838 r = link_handle_bound_to_list(link);
1839 if (r < 0)
1840 return r;
1841
1842 return 0;
1843 }
1844
1845 static void link_free_bound_to_list(Link *link) {
1846 Link *bound_to;
1847 Iterator i;
1848
1849 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
1850 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
1851
1852 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
1853 link_dirty(bound_to);
1854 }
1855
1856 return;
1857 }
1858
1859 static void link_free_bound_by_list(Link *link) {
1860 Link *bound_by;
1861 Iterator i;
1862
1863 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
1864 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
1865
1866 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
1867 link_dirty(bound_by);
1868 link_handle_bound_to_list(bound_by);
1869 }
1870 }
1871
1872 return;
1873 }
1874
1875 static void link_free_carrier_maps(Link *link) {
1876 bool list_updated = false;
1877
1878 assert(link);
1879
1880 if (!hashmap_isempty(link->bound_to_links)) {
1881 link_free_bound_to_list(link);
1882 list_updated = true;
1883 }
1884
1885 if (!hashmap_isempty(link->bound_by_links)) {
1886 link_free_bound_by_list(link);
1887 list_updated = true;
1888 }
1889
1890 if (list_updated)
1891 link_dirty(link);
1892
1893 return;
1894 }
1895
1896 static int link_append_to_master(Link *link, NetDev *netdev) {
1897 Link *master;
1898 int r;
1899
1900 assert(link);
1901 assert(netdev);
1902
1903 r = link_get(link->manager, netdev->ifindex, &master);
1904 if (r < 0)
1905 return r;
1906
1907 r = set_ensure_allocated(&master->slaves, NULL);
1908 if (r < 0)
1909 return r;
1910
1911 r = set_put(master->slaves, link);
1912 if (r < 0)
1913 return r;
1914
1915 link_ref(link);
1916 return 0;
1917 }
1918
1919 static void link_drop_from_master(Link *link, NetDev *netdev) {
1920 Link *master;
1921
1922 assert(link);
1923
1924 if (!link->manager || !netdev)
1925 return;
1926
1927 if (link_get(link->manager, netdev->ifindex, &master) < 0)
1928 return;
1929
1930 link_unref(set_remove(master->slaves, link));
1931 }
1932
1933 static void link_detach_from_manager(Link *link) {
1934 if (!link || !link->manager)
1935 return;
1936
1937 link_unref(set_remove(link->manager->links_requesting_uuid, link));
1938 link_clean(link);
1939
1940 /* The following must be called at last. */
1941 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
1942 link_unref(link);
1943 }
1944
1945 void link_drop(Link *link) {
1946 if (!link || link->state == LINK_STATE_LINGER)
1947 return;
1948
1949 link_set_state(link, LINK_STATE_LINGER);
1950
1951 link_free_carrier_maps(link);
1952
1953 if (link->network) {
1954 link_drop_from_master(link, link->network->bridge);
1955 link_drop_from_master(link, link->network->bond);
1956 }
1957
1958 log_link_debug(link, "Link removed");
1959
1960 (void) unlink(link->state_file);
1961 link_detach_from_manager(link);
1962 }
1963
1964 static int link_joined(Link *link) {
1965 int r;
1966
1967 assert(link);
1968 assert(link->network);
1969
1970 if (!hashmap_isempty(link->bound_to_links)) {
1971 r = link_handle_bound_to_list(link);
1972 if (r < 0)
1973 return r;
1974 } else if (!(link->flags & IFF_UP)) {
1975 r = link_up(link);
1976 if (r < 0) {
1977 link_enter_failed(link);
1978 return r;
1979 }
1980 }
1981
1982 if (link->network->bridge) {
1983 r = link_set_bridge(link);
1984 if (r < 0)
1985 log_link_error_errno(link, r, "Could not set bridge message: %m");
1986
1987 r = link_append_to_master(link, link->network->bridge);
1988 if (r < 0)
1989 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
1990 }
1991
1992 if (link->network->bond) {
1993 r = link_set_bond(link);
1994 if (r < 0)
1995 log_link_error_errno(link, r, "Could not set bond message: %m");
1996
1997 r = link_append_to_master(link, link->network->bond);
1998 if (r < 0)
1999 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2000 }
2001
2002 if (link->network->use_br_vlan &&
2003 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2004 r = link_set_bridge_vlan(link);
2005 if (r < 0)
2006 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2007 }
2008
2009 /* Skip setting up addresses until it gets carrier,
2010 or it would try to set addresses twice,
2011 which is bad for non-idempotent steps. */
2012 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2013 return 0;
2014
2015 link_set_state(link, LINK_STATE_CONFIGURING);
2016 return link_request_set_addresses(link);
2017 }
2018
2019 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2020 int r;
2021
2022 assert(link);
2023 assert(link->network);
2024 assert(link->enslaving > 0);
2025
2026 link->enslaving--;
2027
2028 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2029 return 1;
2030
2031 r = sd_netlink_message_get_errno(m);
2032 if (r < 0 && r != -EEXIST) {
2033 log_link_error_errno(link, r, "Could not join netdev: %m");
2034 link_enter_failed(link);
2035 return 1;
2036 } else
2037 log_link_debug(link, "Joined netdev");
2038
2039 if (link->enslaving == 0) {
2040 link_joined(link);
2041 }
2042
2043 return 1;
2044 }
2045
2046 static int link_enter_join_netdev(Link *link) {
2047 NetDev *netdev;
2048 Iterator i;
2049 int r;
2050
2051 assert(link);
2052 assert(link->network);
2053 assert(link->state == LINK_STATE_INITIALIZED);
2054
2055 link_set_state(link, LINK_STATE_CONFIGURING);
2056
2057 link_dirty(link);
2058 link->enslaving = 0;
2059
2060 if (link->network->bond) {
2061 if (link->network->bond->state == NETDEV_STATE_READY &&
2062 link->network->bond->ifindex == link->master_ifindex)
2063 return link_joined(link);
2064
2065 log_struct(LOG_DEBUG,
2066 LOG_LINK_INTERFACE(link),
2067 LOG_NETDEV_INTERFACE(link->network->bond),
2068 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2069
2070 link->enslaving++;
2071
2072 r = netdev_join(link->network->bond, link, netdev_join_handler);
2073 if (r < 0) {
2074 log_struct_errno(LOG_WARNING, r,
2075 LOG_LINK_INTERFACE(link),
2076 LOG_NETDEV_INTERFACE(link->network->bond),
2077 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2078 link_enter_failed(link);
2079 return r;
2080 }
2081 }
2082
2083 if (link->network->bridge) {
2084 log_struct(LOG_DEBUG,
2085 LOG_LINK_INTERFACE(link),
2086 LOG_NETDEV_INTERFACE(link->network->bridge),
2087 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2088
2089 link->enslaving++;
2090
2091 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2092 if (r < 0) {
2093 log_struct_errno(LOG_WARNING, r,
2094 LOG_LINK_INTERFACE(link),
2095 LOG_NETDEV_INTERFACE(link->network->bridge),
2096 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2097 link_enter_failed(link);
2098 return r;
2099 }
2100 }
2101
2102 if (link->network->vrf) {
2103 log_struct(LOG_DEBUG,
2104 LOG_LINK_INTERFACE(link),
2105 LOG_NETDEV_INTERFACE(link->network->vrf),
2106 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2107
2108 link->enslaving++;
2109
2110 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2111 if (r < 0) {
2112 log_struct_errno(LOG_WARNING, r,
2113 LOG_LINK_INTERFACE(link),
2114 LOG_NETDEV_INTERFACE(link->network->vrf),
2115 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2116 link_enter_failed(link);
2117 return r;
2118 }
2119 }
2120
2121 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2122
2123 if (netdev->ifindex > 0)
2124 /* Assume already enslaved. */
2125 continue;
2126
2127 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2128 continue;
2129
2130 log_struct(LOG_DEBUG,
2131 LOG_LINK_INTERFACE(link),
2132 LOG_NETDEV_INTERFACE(netdev),
2133 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2134
2135 link->enslaving++;
2136
2137 r = netdev_join(netdev, link, netdev_join_handler);
2138 if (r < 0) {
2139 log_struct_errno(LOG_WARNING, r,
2140 LOG_LINK_INTERFACE(link),
2141 LOG_NETDEV_INTERFACE(netdev),
2142 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2143 link_enter_failed(link);
2144 return r;
2145 }
2146 }
2147
2148 if (link->enslaving == 0)
2149 return link_joined(link);
2150
2151 return 0;
2152 }
2153
2154 static int link_set_ipv4_forward(Link *link) {
2155 int r;
2156
2157 if (!link_ipv4_forward_enabled(link))
2158 return 0;
2159
2160 /* We propagate the forwarding flag from one interface to the
2161 * global setting one way. This means: as long as at least one
2162 * interface was configured at any time that had IP forwarding
2163 * enabled the setting will stay on for good. We do this
2164 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2165 * somewhat in sync (see below). */
2166
2167 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2168 if (r < 0)
2169 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2170
2171 return 0;
2172 }
2173
2174 static int link_set_ipv6_forward(Link *link) {
2175 int r;
2176
2177 if (!link_ipv6_forward_enabled(link))
2178 return 0;
2179
2180 /* On Linux, the IPv6 stack does not know a per-interface
2181 * packet forwarding setting: either packet forwarding is on
2182 * for all, or off for all. We hence don't bother with a
2183 * per-interface setting, but simply propagate the interface
2184 * flag, if it is set, to the global flag, one-way. Note that
2185 * while IPv4 would allow a per-interface flag, we expose the
2186 * same behaviour there and also propagate the setting from
2187 * one to all, to keep things simple (see above). */
2188
2189 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2190 if (r < 0)
2191 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2192
2193 return 0;
2194 }
2195
2196 static int link_set_ipv6_privacy_extensions(Link *link) {
2197 IPv6PrivacyExtensions s;
2198 int r;
2199
2200 s = link_ipv6_privacy_extensions(link);
2201 if (s < 0)
2202 return 0;
2203
2204 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2205 if (r < 0)
2206 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2207
2208 return 0;
2209 }
2210
2211 static int link_set_ipv6_accept_ra(Link *link) {
2212 int r;
2213
2214 /* Make this a NOP if IPv6 is not available */
2215 if (!socket_ipv6_is_supported())
2216 return 0;
2217
2218 if (link->flags & IFF_LOOPBACK)
2219 return 0;
2220
2221 if (!link->network)
2222 return 0;
2223
2224 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2225 if (r < 0)
2226 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2227
2228 return 0;
2229 }
2230
2231 static int link_set_ipv6_dad_transmits(Link *link) {
2232 int r;
2233
2234 /* Make this a NOP if IPv6 is not available */
2235 if (!socket_ipv6_is_supported())
2236 return 0;
2237
2238 if (link->flags & IFF_LOOPBACK)
2239 return 0;
2240
2241 if (!link->network)
2242 return 0;
2243
2244 if (link->network->ipv6_dad_transmits < 0)
2245 return 0;
2246
2247 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2248 if (r < 0)
2249 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2250
2251 return 0;
2252 }
2253
2254 static int link_set_ipv6_hop_limit(Link *link) {
2255 int r;
2256
2257 /* Make this a NOP if IPv6 is not available */
2258 if (!socket_ipv6_is_supported())
2259 return 0;
2260
2261 if (link->flags & IFF_LOOPBACK)
2262 return 0;
2263
2264 if (!link->network)
2265 return 0;
2266
2267 if (link->network->ipv6_hop_limit < 0)
2268 return 0;
2269
2270 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2271 if (r < 0)
2272 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2273
2274 return 0;
2275 }
2276
2277 static int link_set_ipv6_mtu(Link *link) {
2278 int r;
2279
2280 /* Make this a NOP if IPv6 is not available */
2281 if (!socket_ipv6_is_supported())
2282 return 0;
2283
2284 if (link->flags & IFF_LOOPBACK)
2285 return 0;
2286
2287 if (link->network->ipv6_mtu == 0)
2288 return 0;
2289
2290 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2291 if (r < 0)
2292 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2293
2294 return 0;
2295 }
2296
2297 static bool link_is_static_address_configured(Link *link, Address *address) {
2298 Address *net_address;
2299
2300 assert(link);
2301 assert(address);
2302
2303 if (!link->network)
2304 return false;
2305
2306 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2307 if (address_equal(net_address, address))
2308 return true;
2309
2310 return false;
2311 }
2312
2313 static bool link_is_static_route_configured(Link *link, Route *route) {
2314 Route *net_route;
2315
2316 assert(link);
2317 assert(route);
2318
2319 if (!link->network)
2320 return false;
2321
2322 LIST_FOREACH(routes, net_route, link->network->static_routes)
2323 if (route_equal(net_route, route))
2324 return true;
2325
2326 return false;
2327 }
2328
2329 static bool link_address_is_dynamic(Link *link, Address *address) {
2330 Route *route;
2331 Iterator i;
2332
2333 assert(link);
2334 assert(address);
2335
2336 if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2337 return true;
2338
2339 /* Even when the address is leased from a DHCP server, networkd assign the address
2340 * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2341 * corresponding routes with RTPROT_DHCP. */
2342 SET_FOREACH(route, link->routes_foreign, i) {
2343 if (route->protocol != RTPROT_DHCP)
2344 continue;
2345
2346 if (address->family != route->family)
2347 continue;
2348
2349 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2350 return true;
2351 }
2352
2353 return false;
2354 }
2355
2356 static int link_drop_foreign_config(Link *link) {
2357 Address *address;
2358 Route *route;
2359 Iterator i;
2360 int r;
2361
2362 SET_FOREACH(address, link->addresses_foreign, i) {
2363 /* we consider IPv6LL addresses to be managed by the kernel */
2364 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2365 continue;
2366
2367 if (link_address_is_dynamic(link, address)) {
2368 if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2369 continue;
2370 } else if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2371 continue;
2372
2373 if (link_is_static_address_configured(link, address)) {
2374 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2375 if (r < 0)
2376 return log_link_error_errno(link, r, "Failed to add address: %m");
2377 } else {
2378 r = address_remove(address, link, NULL);
2379 if (r < 0)
2380 return r;
2381 }
2382 }
2383
2384 SET_FOREACH(route, link->routes_foreign, i) {
2385 /* do not touch routes managed by the kernel */
2386 if (route->protocol == RTPROT_KERNEL)
2387 continue;
2388
2389 if (route->protocol == RTPROT_STATIC &&
2390 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2391 continue;
2392
2393 if (route->protocol == RTPROT_DHCP &&
2394 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2395 continue;
2396
2397 if (link_is_static_route_configured(link, route)) {
2398 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2399 if (r < 0)
2400 return r;
2401 } else {
2402 r = route_remove(route, link, NULL);
2403 if (r < 0)
2404 return r;
2405 }
2406 }
2407
2408 return 0;
2409 }
2410
2411 static int link_drop_config(Link *link) {
2412 Address *address, *pool_address;
2413 Route *route;
2414 Iterator i;
2415 int r;
2416
2417 SET_FOREACH(address, link->addresses, i) {
2418 /* we consider IPv6LL addresses to be managed by the kernel */
2419 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2420 continue;
2421
2422 r = address_remove(address, link, NULL);
2423 if (r < 0)
2424 return r;
2425
2426 /* If this address came from an address pool, clean up the pool */
2427 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2428 if (address_equal(address, pool_address)) {
2429 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2430 address_free(pool_address);
2431 break;
2432 }
2433 }
2434 }
2435
2436 SET_FOREACH(route, link->routes, i) {
2437 /* do not touch routes managed by the kernel */
2438 if (route->protocol == RTPROT_KERNEL)
2439 continue;
2440
2441 r = route_remove(route, link, NULL);
2442 if (r < 0)
2443 return r;
2444 }
2445
2446 ndisc_flush(link);
2447
2448 return 0;
2449 }
2450
2451 static int link_configure(Link *link) {
2452 int r;
2453
2454 assert(link);
2455 assert(link->network);
2456 assert(link->state == LINK_STATE_INITIALIZED);
2457
2458 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
2459 return link_configure_can(link);
2460
2461 /* Drop foreign config, but ignore loopback or critical devices.
2462 * We do not want to remove loopback address or addresses used for root NFS. */
2463 if (!(link->flags & IFF_LOOPBACK) &&
2464 link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
2465 r = link_drop_foreign_config(link);
2466 if (r < 0)
2467 return r;
2468 }
2469
2470 r = link_set_proxy_arp(link);
2471 if (r < 0)
2472 return r;
2473
2474 r = ipv6_proxy_ndp_addresses_configure(link);
2475 if (r < 0)
2476 return r;
2477
2478 r = link_set_ipv4_forward(link);
2479 if (r < 0)
2480 return r;
2481
2482 r = link_set_ipv6_forward(link);
2483 if (r < 0)
2484 return r;
2485
2486 r = link_set_ipv6_privacy_extensions(link);
2487 if (r < 0)
2488 return r;
2489
2490 r = link_set_ipv6_accept_ra(link);
2491 if (r < 0)
2492 return r;
2493
2494 r = link_set_ipv6_dad_transmits(link);
2495 if (r < 0)
2496 return r;
2497
2498 r = link_set_ipv6_hop_limit(link);
2499 if (r < 0)
2500 return r;
2501
2502 r = link_set_flags(link);
2503 if (r < 0)
2504 return r;
2505
2506 r = link_set_ipv6_mtu(link);
2507 if (r < 0)
2508 return r;
2509
2510 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
2511 r = ipv4ll_configure(link);
2512 if (r < 0)
2513 return r;
2514 }
2515
2516 if (link_dhcp4_enabled(link)) {
2517 r = dhcp4_set_promote_secondaries(link);
2518 if (r < 0)
2519 return r;
2520
2521 r = dhcp4_configure(link);
2522 if (r < 0)
2523 return r;
2524 }
2525
2526 if (link_dhcp4_server_enabled(link)) {
2527 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2528 if (r < 0)
2529 return r;
2530
2531 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2532 if (r < 0)
2533 return r;
2534 }
2535
2536 if (link_dhcp6_enabled(link) ||
2537 link_ipv6_accept_ra_enabled(link)) {
2538 r = dhcp6_configure(link);
2539 if (r < 0)
2540 return r;
2541 }
2542
2543 if (link_ipv6_accept_ra_enabled(link)) {
2544 r = ndisc_configure(link);
2545 if (r < 0)
2546 return r;
2547 }
2548
2549 if (link_radv_enabled(link)) {
2550 r = radv_configure(link);
2551 if (r < 0)
2552 return r;
2553 }
2554
2555 if (link_lldp_rx_enabled(link)) {
2556 r = link_lldp_rx_configure(link);
2557 if (r < 0)
2558 return r;
2559 }
2560
2561 r = link_configure_mtu(link);
2562 if (r < 0)
2563 return r;
2564
2565 r = link_configure_addrgen_mode(link);
2566 if (r < 0)
2567 return r;
2568
2569 return link_configure_after_setting_mtu(link);
2570 }
2571
2572 static int link_configure_after_setting_mtu(Link *link) {
2573 int r;
2574
2575 assert(link);
2576 assert(link->network);
2577 assert(link->state == LINK_STATE_INITIALIZED);
2578
2579 if (link->setting_mtu)
2580 return 0;
2581
2582 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2583 r = link_acquire_conf(link);
2584 if (r < 0)
2585 return r;
2586 }
2587
2588 return link_enter_join_netdev(link);
2589 }
2590
2591 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
2592 assert(duid);
2593
2594 if (duid->raw_data_len > 0)
2595 return 0;
2596
2597 if (duid->type != DUID_TYPE_UUID)
2598 return -EINVAL;
2599
2600 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
2601 duid->raw_data_len = sizeof(sd_id128_t);
2602
2603 return 1;
2604 }
2605
2606 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
2607 Manager *manager = userdata;
2608 const sd_bus_error *e;
2609 const void *a;
2610 size_t sz;
2611 DUID *duid;
2612 Link *link;
2613 int r;
2614
2615 assert(m);
2616 assert(manager);
2617
2618 e = sd_bus_message_get_error(m);
2619 if (e) {
2620 log_error_errno(sd_bus_error_get_errno(e),
2621 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
2622 e->message);
2623 goto configure;
2624 }
2625
2626 r = sd_bus_message_read_array(m, 'y', &a, &sz);
2627 if (r < 0)
2628 goto configure;
2629
2630 if (sz != sizeof(sd_id128_t)) {
2631 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
2632 goto configure;
2633 }
2634
2635 memcpy(&manager->product_uuid, a, sz);
2636 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
2637 (void) duid_set_uuid(duid, manager->product_uuid);
2638
2639 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
2640
2641 configure:
2642 while ((link = set_steal_first(manager->links_requesting_uuid))) {
2643 r = link_configure(link);
2644 if (r < 0)
2645 log_link_error_errno(link, r, "Failed to configure link: %m");
2646 }
2647
2648 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
2649
2650 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
2651 * even if the method fails. */
2652 manager->has_product_uuid = true;
2653
2654 return 1;
2655 }
2656
2657 static bool link_requires_uuid(Link *link) {
2658 const DUID *duid;
2659
2660 assert(link);
2661 assert(link->manager);
2662 assert(link->network);
2663
2664 duid = link_get_duid(link);
2665 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
2666 return false;
2667
2668 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
2669 return true;
2670
2671 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
2672 return true;
2673
2674 return false;
2675 }
2676
2677 static int link_configure_duid(Link *link) {
2678 Manager *m;
2679 DUID *duid;
2680 int r;
2681
2682 assert(link);
2683 assert(link->manager);
2684 assert(link->network);
2685
2686 m = link->manager;
2687 duid = link_get_duid(link);
2688
2689 if (!link_requires_uuid(link))
2690 return 1;
2691
2692 if (m->has_product_uuid) {
2693 (void) duid_set_uuid(duid, m->product_uuid);
2694 return 1;
2695 }
2696
2697 if (!m->links_requesting_uuid) {
2698 r = manager_request_product_uuid(m, link);
2699 if (r < 0) {
2700 if (r == -ENOMEM)
2701 return r;
2702
2703 log_link_warning_errno(link, r,
2704 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
2705 return 1;
2706 }
2707 } else {
2708 r = set_put(m->links_requesting_uuid, link);
2709 if (r < 0)
2710 return log_oom();
2711
2712 r = set_put(m->duids_requesting_uuid, duid);
2713 if (r < 0)
2714 return log_oom();
2715 }
2716
2717 return 0;
2718 }
2719
2720 static int link_initialized_and_synced(Link *link) {
2721 Network *network;
2722 int r;
2723
2724 assert(link);
2725 assert(link->ifname);
2726 assert(link->manager);
2727
2728 /* We may get called either from the asynchronous netlink callback,
2729 * or directly for link_add() if running in a container. See link_add(). */
2730 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
2731 return 0;
2732
2733 log_link_debug(link, "Link state is up-to-date");
2734 link_set_state(link, LINK_STATE_INITIALIZED);
2735
2736 r = link_new_bound_by_list(link);
2737 if (r < 0)
2738 return r;
2739
2740 r = link_handle_bound_by_list(link);
2741 if (r < 0)
2742 return r;
2743
2744 if (!link->network) {
2745 r = network_get(link->manager, link->sd_device, link->ifname,
2746 &link->mac, &network);
2747 if (r == -ENOENT) {
2748 link_enter_unmanaged(link);
2749 return 0;
2750 } else if (r == 0 && network->unmanaged) {
2751 link_enter_unmanaged(link);
2752 return 0;
2753 } else if (r < 0)
2754 return r;
2755
2756 if (link->flags & IFF_LOOPBACK) {
2757 if (network->link_local != ADDRESS_FAMILY_NO)
2758 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2759
2760 if (network->dhcp != ADDRESS_FAMILY_NO)
2761 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2762
2763 if (network->dhcp_server)
2764 log_link_debug(link, "Ignoring DHCP server for loopback link");
2765 }
2766
2767 r = network_apply(network, link);
2768 if (r < 0)
2769 return r;
2770 }
2771
2772 r = link_new_bound_to_list(link);
2773 if (r < 0)
2774 return r;
2775
2776 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
2777 * link_configure() is called later asynchronously. */
2778 r = link_configure_duid(link);
2779 if (r <= 0)
2780 return r;
2781
2782 r = link_configure(link);
2783 if (r < 0)
2784 return r;
2785
2786 return 0;
2787 }
2788
2789 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2790 (void) link_initialized_and_synced(link);
2791 return 1;
2792 }
2793
2794 int link_initialized(Link *link, sd_device *device) {
2795 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2796 int r;
2797
2798 assert(link);
2799 assert(link->manager);
2800 assert(link->manager->rtnl);
2801 assert(device);
2802
2803 if (link->state != LINK_STATE_PENDING)
2804 return 0;
2805
2806 if (link->sd_device)
2807 return 0;
2808
2809 log_link_debug(link, "udev initialized link");
2810 link_set_state(link, LINK_STATE_INITIALIZED);
2811
2812 link->sd_device = sd_device_ref(device);
2813
2814 /* udev has initialized the link, but we don't know if we have yet
2815 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2816 * when it returns we know that the pending NEWLINKs have already been
2817 * processed and that we are up-to-date */
2818
2819 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2820 link->ifindex);
2821 if (r < 0)
2822 return r;
2823
2824 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
2825 link_netlink_destroy_callback, link);
2826 if (r < 0)
2827 return r;
2828
2829 link_ref(link);
2830
2831 return 0;
2832 }
2833
2834 static int link_load(Link *link) {
2835 _cleanup_free_ char *network_file = NULL,
2836 *addresses = NULL,
2837 *routes = NULL,
2838 *dhcp4_address = NULL,
2839 *ipv4ll_address = NULL;
2840 union in_addr_union address;
2841 union in_addr_union route_dst;
2842 const char *p;
2843 int r;
2844
2845 assert(link);
2846
2847 r = parse_env_file(NULL, link->state_file,
2848 "NETWORK_FILE", &network_file,
2849 "ADDRESSES", &addresses,
2850 "ROUTES", &routes,
2851 "DHCP4_ADDRESS", &dhcp4_address,
2852 "IPV4LL_ADDRESS", &ipv4ll_address);
2853 if (r < 0 && r != -ENOENT)
2854 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
2855
2856 if (network_file) {
2857 Network *network;
2858 char *suffix;
2859
2860 /* drop suffix */
2861 suffix = strrchr(network_file, '.');
2862 if (!suffix) {
2863 log_link_debug(link, "Failed to get network name from %s", network_file);
2864 goto network_file_fail;
2865 }
2866 *suffix = '\0';
2867
2868 r = network_get_by_name(link->manager, basename(network_file), &network);
2869 if (r < 0) {
2870 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
2871 goto network_file_fail;
2872 }
2873
2874 r = network_apply(network, link);
2875 if (r < 0)
2876 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
2877 }
2878
2879 network_file_fail:
2880
2881 if (addresses) {
2882 p = addresses;
2883
2884 for (;;) {
2885 _cleanup_free_ char *address_str = NULL;
2886 char *prefixlen_str;
2887 int family;
2888 unsigned char prefixlen;
2889
2890 r = extract_first_word(&p, &address_str, NULL, 0);
2891 if (r < 0) {
2892 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
2893 continue;
2894 }
2895 if (r == 0)
2896 break;
2897
2898 prefixlen_str = strchr(address_str, '/');
2899 if (!prefixlen_str) {
2900 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
2901 continue;
2902 }
2903
2904 *prefixlen_str++ = '\0';
2905
2906 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
2907 if (r != 1) {
2908 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
2909 continue;
2910 }
2911
2912 r = in_addr_from_string_auto(address_str, &family, &address);
2913 if (r < 0) {
2914 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
2915 continue;
2916 }
2917
2918 r = address_add(link, family, &address, prefixlen, NULL);
2919 if (r < 0)
2920 return log_link_error_errno(link, r, "Failed to add address: %m");
2921 }
2922 }
2923
2924 if (routes) {
2925 p = routes;
2926
2927 for (;;) {
2928 Route *route;
2929 _cleanup_free_ char *route_str = NULL;
2930 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
2931 usec_t lifetime;
2932 char *prefixlen_str;
2933 int family;
2934 unsigned char prefixlen, tos, table;
2935 uint32_t priority;
2936
2937 r = extract_first_word(&p, &route_str, NULL, 0);
2938 if (r < 0) {
2939 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
2940 continue;
2941 }
2942 if (r == 0)
2943 break;
2944
2945 prefixlen_str = strchr(route_str, '/');
2946 if (!prefixlen_str) {
2947 log_link_debug(link, "Failed to parse route %s", route_str);
2948 continue;
2949 }
2950
2951 *prefixlen_str++ = '\0';
2952
2953 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
2954 if (r != 5) {
2955 log_link_debug(link,
2956 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
2957 prefixlen_str);
2958 continue;
2959 }
2960
2961 r = in_addr_from_string_auto(route_str, &family, &route_dst);
2962 if (r < 0) {
2963 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
2964 continue;
2965 }
2966
2967 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
2968 if (r < 0)
2969 return log_link_error_errno(link, r, "Failed to add route: %m");
2970
2971 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
2972 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
2973 0, route_expire_handler, route);
2974 if (r < 0)
2975 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
2976 }
2977
2978 route->lifetime = lifetime;
2979 sd_event_source_unref(route->expire);
2980 route->expire = TAKE_PTR(expire);
2981 }
2982 }
2983
2984 if (dhcp4_address) {
2985 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
2986 if (r < 0) {
2987 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
2988 goto dhcp4_address_fail;
2989 }
2990
2991 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
2992 if (r < 0)
2993 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
2994
2995 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
2996 if (r < 0)
2997 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
2998 }
2999
3000 dhcp4_address_fail:
3001
3002 if (ipv4ll_address) {
3003 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3004 if (r < 0) {
3005 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3006 goto ipv4ll_address_fail;
3007 }
3008
3009 r = sd_ipv4ll_new(&link->ipv4ll);
3010 if (r < 0)
3011 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3012
3013 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3014 if (r < 0)
3015 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3016 }
3017
3018 ipv4ll_address_fail:
3019
3020 return 0;
3021 }
3022
3023 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3024 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3025 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3026 Link *link;
3027 int r;
3028
3029 assert(m);
3030 assert(m->rtnl);
3031 assert(message);
3032 assert(ret);
3033
3034 r = link_new(m, message, ret);
3035 if (r < 0)
3036 return r;
3037
3038 link = *ret;
3039
3040 log_link_debug(link, "Link %d added", link->ifindex);
3041
3042 r = link_load(link);
3043 if (r < 0)
3044 return r;
3045
3046 if (detect_container() <= 0) {
3047 /* not in a container, udev will be around */
3048 sprintf(ifindex_str, "n%d", link->ifindex);
3049 r = sd_device_new_from_device_id(&device, ifindex_str);
3050 if (r < 0) {
3051 log_link_warning_errno(link, r, "Could not find device: %m");
3052 goto failed;
3053 }
3054
3055 r = sd_device_get_is_initialized(device);
3056 if (r < 0) {
3057 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3058 goto failed;
3059 }
3060 if (r == 0) {
3061 /* not yet ready */
3062 log_link_debug(link, "link pending udev initialization...");
3063 return 0;
3064 }
3065
3066 r = device_is_renaming(device);
3067 if (r < 0) {
3068 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3069 goto failed;
3070 }
3071 if (r > 0) {
3072 log_link_debug(link, "Interface is under renaming, pending initialization.");
3073 return 0;
3074 }
3075
3076 r = link_initialized(link, device);
3077 if (r < 0)
3078 goto failed;
3079 } else {
3080 r = link_initialized_and_synced(link);
3081 if (r < 0)
3082 goto failed;
3083 }
3084
3085 return 0;
3086 failed:
3087 link_enter_failed(link);
3088 return r;
3089 }
3090
3091 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3092 int r;
3093
3094 assert(link);
3095
3096 log_link_info(link, "Gained IPv6LL");
3097
3098 link->ipv6ll_address = *address;
3099 link_check_ready(link);
3100
3101 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3102 r = link_acquire_ipv6_conf(link);
3103 if (r < 0) {
3104 link_enter_failed(link);
3105 return r;
3106 }
3107 }
3108
3109 return 0;
3110 }
3111
3112 static int link_carrier_gained(Link *link) {
3113 int r;
3114
3115 assert(link);
3116
3117 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3118 r = link_acquire_conf(link);
3119 if (r < 0) {
3120 link_enter_failed(link);
3121 return r;
3122 }
3123
3124 link_set_state(link, LINK_STATE_CONFIGURING);
3125 r = link_request_set_addresses(link);
3126 if (r < 0)
3127 return r;
3128 }
3129
3130 r = link_handle_bound_by_list(link);
3131 if (r < 0)
3132 return r;
3133
3134 return 0;
3135 }
3136
3137 static int link_carrier_lost(Link *link) {
3138 int r;
3139
3140 assert(link);
3141
3142 if (link->network && link->network->ignore_carrier_loss)
3143 return 0;
3144
3145 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3146 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3147 * configuration and stop the clients as well. */
3148 if (link->setting_mtu)
3149 return 0;
3150
3151 r = link_stop_clients(link, false);
3152 if (r < 0) {
3153 link_enter_failed(link);
3154 return r;
3155 }
3156
3157 if (link_dhcp4_server_enabled(link))
3158 (void) sd_dhcp_server_stop(link->dhcp_server);
3159
3160 r = link_drop_config(link);
3161 if (r < 0)
3162 return r;
3163
3164 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3165 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3166 r = link_drop_foreign_config(link);
3167 if (r < 0)
3168 return r;
3169 }
3170
3171 r = link_handle_bound_by_list(link);
3172 if (r < 0)
3173 return r;
3174
3175 return 0;
3176 }
3177
3178 int link_carrier_reset(Link *link) {
3179 int r;
3180
3181 assert(link);
3182
3183 if (link_has_carrier(link)) {
3184 r = link_carrier_lost(link);
3185 if (r < 0)
3186 return r;
3187
3188 r = link_carrier_gained(link);
3189 if (r < 0)
3190 return r;
3191
3192 log_link_info(link, "Reset carrier");
3193 }
3194
3195 return 0;
3196 }
3197
3198 int link_update(Link *link, sd_netlink_message *m) {
3199 struct ether_addr mac;
3200 const char *ifname;
3201 uint32_t mtu;
3202 bool had_carrier, carrier_gained, carrier_lost;
3203 int old_master, r;
3204
3205 assert(link);
3206 assert(link->ifname);
3207 assert(m);
3208
3209 if (link->state == LINK_STATE_LINGER) {
3210 log_link_info(link, "Link re-added");
3211 link_set_state(link, LINK_STATE_CONFIGURING);
3212
3213 r = link_new_carrier_maps(link);
3214 if (r < 0)
3215 return r;
3216 }
3217
3218 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3219 if (r >= 0 && !streq(ifname, link->ifname)) {
3220 Manager *manager = link->manager;
3221
3222 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3223
3224 link_drop(link);
3225 r = link_add(manager, m, &link);
3226 if (r < 0)
3227 return r;
3228 }
3229
3230 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3231 if (r >= 0 && mtu > 0) {
3232 link->mtu = mtu;
3233 if (link->original_mtu == 0) {
3234 link->original_mtu = mtu;
3235 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3236 }
3237
3238 if (link->dhcp_client) {
3239 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3240 link->mtu);
3241 if (r < 0)
3242 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3243 }
3244
3245 if (link->radv) {
3246 r = sd_radv_set_mtu(link->radv, link->mtu);
3247 if (r < 0)
3248 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3249 }
3250 }
3251
3252 /* The kernel may broadcast NEWLINK messages without the MAC address
3253 set, simply ignore them. */
3254 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3255 if (r >= 0) {
3256 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3257 ETH_ALEN)) {
3258
3259 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3260 ETH_ALEN);
3261
3262 log_link_debug(link, "MAC address: "
3263 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3264 mac.ether_addr_octet[0],
3265 mac.ether_addr_octet[1],
3266 mac.ether_addr_octet[2],
3267 mac.ether_addr_octet[3],
3268 mac.ether_addr_octet[4],
3269 mac.ether_addr_octet[5]);
3270
3271 if (link->ipv4ll) {
3272 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3273 if (r < 0)
3274 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3275 }
3276
3277 if (link->dhcp_client) {
3278 r = sd_dhcp_client_set_mac(link->dhcp_client,
3279 (const uint8_t *) &link->mac,
3280 sizeof (link->mac),
3281 ARPHRD_ETHER);
3282 if (r < 0)
3283 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3284
3285 r = dhcp4_set_client_identifier(link);
3286 if (r < 0)
3287 return r;
3288 }
3289
3290 if (link->dhcp6_client) {
3291 const DUID* duid = link_get_duid(link);
3292
3293 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3294 (const uint8_t *) &link->mac,
3295 sizeof (link->mac),
3296 ARPHRD_ETHER);
3297 if (r < 0)
3298 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3299
3300 if (link->network->iaid_set) {
3301 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3302 link->network->iaid);
3303 if (r < 0)
3304 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3305 }
3306
3307 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3308 duid->type,
3309 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3310 duid->raw_data_len);
3311 if (r < 0)
3312 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3313 }
3314
3315 if (link->radv) {
3316 r = sd_radv_set_mac(link->radv, &link->mac);
3317 if (r < 0)
3318 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3319 }
3320
3321 if (link->ndisc) {
3322 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3323 if (r < 0)
3324 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3325 }
3326 }
3327 }
3328
3329 old_master = link->master_ifindex;
3330 (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
3331
3332 had_carrier = link_has_carrier(link);
3333
3334 r = link_update_flags(link, m, old_master != link->master_ifindex);
3335 if (r < 0)
3336 return r;
3337
3338 r = link_update_lldp(link);
3339 if (r < 0)
3340 return r;
3341
3342 carrier_gained = !had_carrier && link_has_carrier(link);
3343 carrier_lost = had_carrier && !link_has_carrier(link);
3344
3345 if (carrier_gained) {
3346 log_link_info(link, "Gained carrier");
3347
3348 r = link_carrier_gained(link);
3349 if (r < 0)
3350 return r;
3351 } else if (carrier_lost) {
3352 log_link_info(link, "Lost carrier");
3353
3354 r = link_carrier_lost(link);
3355 if (r < 0)
3356 return r;
3357 }
3358
3359 return 0;
3360 }
3361
3362 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3363 bool space = false;
3364 Iterator i;
3365 Link *link;
3366
3367 assert(f);
3368 assert(prefix);
3369
3370 if (hashmap_isempty(h))
3371 return;
3372
3373 fputs(prefix, f);
3374 HASHMAP_FOREACH(link, h, i) {
3375 if (space)
3376 fputc(' ', f);
3377
3378 fprintf(f, "%i", link->ifindex);
3379 space = true;
3380 }
3381
3382 fputc('\n', f);
3383 }
3384
3385 int link_save(Link *link) {
3386 _cleanup_free_ char *temp_path = NULL;
3387 _cleanup_fclose_ FILE *f = NULL;
3388 const char *admin_state, *oper_state, *carrier_state, *address_state;
3389 Address *a;
3390 Route *route;
3391 Iterator i;
3392 int r;
3393
3394 assert(link);
3395 assert(link->state_file);
3396 assert(link->lease_file);
3397 assert(link->manager);
3398
3399 if (link->state == LINK_STATE_LINGER) {
3400 (void) unlink(link->state_file);
3401 return 0;
3402 }
3403
3404 link_lldp_save(link);
3405
3406 admin_state = link_state_to_string(link->state);
3407 assert(admin_state);
3408
3409 oper_state = link_operstate_to_string(link->operstate);
3410 assert(oper_state);
3411
3412 carrier_state = link_carrier_state_to_string(link->carrier_state);
3413 assert(carrier_state);
3414
3415 address_state = link_address_state_to_string(link->address_state);
3416 assert(address_state);
3417
3418 r = fopen_temporary(link->state_file, &f, &temp_path);
3419 if (r < 0)
3420 goto fail;
3421
3422 (void) fchmod(fileno(f), 0644);
3423
3424 fprintf(f,
3425 "# This is private data. Do not parse.\n"
3426 "ADMIN_STATE=%s\n"
3427 "OPER_STATE=%s\n"
3428 "CARRIER_STATE=%s\n"
3429 "ADDRESS_STATE=%s\n",
3430 admin_state, oper_state, carrier_state, address_state);
3431
3432 if (link->network) {
3433 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
3434 const char *dhcp_domainname = NULL, *p;
3435 sd_dhcp6_lease *dhcp6_lease = NULL;
3436 unsigned j;
3437 bool space;
3438
3439 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3440 yes_no(link->network->required_for_online));
3441
3442 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
3443 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
3444
3445 if (link->dhcp6_client) {
3446 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3447 if (r < 0 && r != -ENOMSG)
3448 log_link_debug(link, "No DHCPv6 lease");
3449 }
3450
3451 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3452
3453 fputs("DNS=", f);
3454 space = false;
3455
3456 for (j = 0; j < link->network->n_dns; j++) {
3457 _cleanup_free_ char *b = NULL;
3458
3459 r = in_addr_to_string(link->network->dns[j].family,
3460 &link->network->dns[j].address, &b);
3461 if (r < 0) {
3462 log_debug_errno(r, "Failed to format address, ignoring: %m");
3463 continue;
3464 }
3465
3466 if (space)
3467 fputc(' ', f);
3468 fputs(b, f);
3469 space = true;
3470 }
3471
3472 if (link->network->dhcp_use_dns &&
3473 link->dhcp_lease) {
3474 const struct in_addr *addresses;
3475
3476 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3477 if (r > 0)
3478 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3479 space = true;
3480 }
3481
3482 if (link->network->dhcp6_use_dns && dhcp6_lease) {
3483 struct in6_addr *in6_addrs;
3484
3485 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3486 if (r > 0) {
3487 if (space)
3488 fputc(' ', f);
3489 serialize_in6_addrs(f, in6_addrs, r);
3490 space = true;
3491 }
3492 }
3493
3494 /* Make sure to flush out old entries before we use the NDISC data */
3495 ndisc_vacuum(link);
3496
3497 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3498 NDiscRDNSS *dd;
3499
3500 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3501 if (space)
3502 fputc(' ', f);
3503
3504 serialize_in6_addrs(f, &dd->address, 1);
3505 space = true;
3506 }
3507 }
3508
3509 fputc('\n', f);
3510
3511 fputs("NTP=", f);
3512 space = false;
3513 fputstrv(f, link->network->ntp, NULL, &space);
3514
3515 if (link->network->dhcp_use_ntp &&
3516 link->dhcp_lease) {
3517 const struct in_addr *addresses;
3518
3519 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3520 if (r > 0)
3521 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3522 space = true;
3523 }
3524
3525 if (link->network->dhcp6_use_ntp && dhcp6_lease) {
3526 struct in6_addr *in6_addrs;
3527 char **hosts;
3528
3529 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3530 &in6_addrs);
3531 if (r > 0) {
3532 if (space)
3533 fputc(' ', f);
3534 serialize_in6_addrs(f, in6_addrs, r);
3535 space = true;
3536 }
3537
3538 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3539 if (r > 0)
3540 fputstrv(f, hosts, NULL, &space);
3541 }
3542
3543 fputc('\n', f);
3544
3545 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3546 if (link->dhcp_lease) {
3547 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3548 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3549 }
3550 if (dhcp6_lease)
3551 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3552 }
3553
3554 fputs("DOMAINS=", f);
3555 space = false;
3556 ORDERED_SET_FOREACH(p, link->network->search_domains, i)
3557 fputs_with_space(f, p, NULL, &space);
3558
3559 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3560 NDiscDNSSL *dd;
3561
3562 if (dhcp_domainname)
3563 fputs_with_space(f, dhcp_domainname, NULL, &space);
3564 if (dhcp_domains)
3565 fputstrv(f, dhcp_domains, NULL, &space);
3566 if (dhcp6_domains)
3567 fputstrv(f, dhcp6_domains, NULL, &space);
3568
3569 SET_FOREACH(dd, link->ndisc_dnssl, i)
3570 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3571 }
3572
3573 fputc('\n', f);
3574
3575 fputs("ROUTE_DOMAINS=", f);
3576 space = false;
3577 ORDERED_SET_FOREACH(p, link->network->route_domains, i)
3578 fputs_with_space(f, p, NULL, &space);
3579
3580 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3581 NDiscDNSSL *dd;
3582
3583 if (dhcp_domainname)
3584 fputs_with_space(f, dhcp_domainname, NULL, &space);
3585 if (dhcp_domains)
3586 fputstrv(f, dhcp_domains, NULL, &space);
3587 if (dhcp6_domains)
3588 fputstrv(f, dhcp6_domains, NULL, &space);
3589
3590 SET_FOREACH(dd, link->ndisc_dnssl, i)
3591 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3592 }
3593
3594 fputc('\n', f);
3595
3596 fprintf(f, "LLMNR=%s\n",
3597 resolve_support_to_string(link->network->llmnr));
3598 fprintf(f, "MDNS=%s\n",
3599 resolve_support_to_string(link->network->mdns));
3600 if (link->network->dns_default_route >= 0)
3601 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
3602
3603 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3604 fprintf(f, "DNS_OVER_TLS=%s\n",
3605 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
3606
3607 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3608 fprintf(f, "DNSSEC=%s\n",
3609 dnssec_mode_to_string(link->network->dnssec_mode));
3610
3611 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3612 const char *n;
3613
3614 fputs("DNSSEC_NTA=", f);
3615 space = false;
3616 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3617 fputs_with_space(f, n, NULL, &space);
3618 fputc('\n', f);
3619 }
3620
3621 fputs("ADDRESSES=", f);
3622 space = false;
3623 SET_FOREACH(a, link->addresses, i) {
3624 _cleanup_free_ char *address_str = NULL;
3625
3626 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3627 if (r < 0)
3628 goto fail;
3629
3630 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3631 space = true;
3632 }
3633 fputc('\n', f);
3634
3635 fputs("ROUTES=", f);
3636 space = false;
3637 SET_FOREACH(route, link->routes, i) {
3638 _cleanup_free_ char *route_str = NULL;
3639
3640 r = in_addr_to_string(route->family, &route->dst, &route_str);
3641 if (r < 0)
3642 goto fail;
3643
3644 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
3645 space ? " " : "", route_str,
3646 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3647 space = true;
3648 }
3649
3650 fputc('\n', f);
3651 }
3652
3653 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3654 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3655
3656 if (link->dhcp_lease) {
3657 struct in_addr address;
3658 const char *tz = NULL;
3659
3660 assert(link->network);
3661
3662 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3663 if (r >= 0)
3664 fprintf(f, "TIMEZONE=%s\n", tz);
3665
3666 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3667 if (r >= 0) {
3668 fputs("DHCP4_ADDRESS=", f);
3669 serialize_in_addrs(f, &address, 1, false, NULL);
3670 fputc('\n', f);
3671 }
3672
3673 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3674 if (r < 0)
3675 goto fail;
3676
3677 fprintf(f,
3678 "DHCP_LEASE=%s\n",
3679 link->lease_file);
3680 } else
3681 (void) unlink(link->lease_file);
3682
3683 if (link->ipv4ll) {
3684 struct in_addr address;
3685
3686 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3687 if (r >= 0) {
3688 fputs("IPV4LL_ADDRESS=", f);
3689 serialize_in_addrs(f, &address, 1, false, NULL);
3690 fputc('\n', f);
3691 }
3692 }
3693
3694 r = fflush_and_check(f);
3695 if (r < 0)
3696 goto fail;
3697
3698 if (rename(temp_path, link->state_file) < 0) {
3699 r = -errno;
3700 goto fail;
3701 }
3702
3703 return 0;
3704
3705 fail:
3706 (void) unlink(link->state_file);
3707 if (temp_path)
3708 (void) unlink(temp_path);
3709
3710 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3711 }
3712
3713 /* The serialized state in /run is no longer up-to-date. */
3714 void link_dirty(Link *link) {
3715 int r;
3716
3717 assert(link);
3718
3719 /* mark manager dirty as link is dirty */
3720 manager_dirty(link->manager);
3721
3722 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3723 if (r < 0)
3724 /* allocation errors are ignored */
3725 return;
3726
3727 r = set_put(link->manager->dirty_links, link);
3728 if (r <= 0)
3729 /* don't take another ref if the link was already dirty */
3730 return;
3731
3732 link_ref(link);
3733 }
3734
3735 /* The serialized state in /run is up-to-date */
3736 void link_clean(Link *link) {
3737 assert(link);
3738 assert(link->manager);
3739
3740 link_unref(set_remove(link->manager->dirty_links, link));
3741 }
3742
3743 static const char* const link_state_table[_LINK_STATE_MAX] = {
3744 [LINK_STATE_PENDING] = "pending",
3745 [LINK_STATE_INITIALIZED] = "initialized",
3746 [LINK_STATE_CONFIGURING] = "configuring",
3747 [LINK_STATE_CONFIGURED] = "configured",
3748 [LINK_STATE_UNMANAGED] = "unmanaged",
3749 [LINK_STATE_FAILED] = "failed",
3750 [LINK_STATE_LINGER] = "linger",
3751 };
3752
3753 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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