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Merge pull request #13005 from keszybz/fix-gcc-warning
[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_set_state(link, LINK_STATE_CONFIGURING);
863 link->routing_policy_rules_configured = false;
864
865 LIST_FOREACH(rules, rule, link->network->rules) {
866 r = routing_policy_rule_get(link->manager, rule, &rrule);
867 if (r >= 0) {
868 if (r == 0)
869 (void) routing_policy_rule_make_local(link->manager, rrule);
870 continue;
871 }
872
873 r = routing_policy_rule_configure(rule, link, NULL);
874 if (r < 0) {
875 log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
876 link_enter_failed(link);
877 return r;
878 }
879 if (r > 0)
880 link->routing_policy_rule_messages++;
881 }
882
883 routing_policy_rule_purge(link->manager, link);
884 if (link->routing_policy_rule_messages == 0) {
885 link->routing_policy_rules_configured = true;
886 link_check_ready(link);
887 } else
888 log_link_debug(link, "Setting routing policy rules");
889
890 return 0;
891 }
892
893 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
894 int r;
895
896 assert(link);
897 assert(link->route_messages > 0);
898 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
899 LINK_STATE_FAILED, LINK_STATE_LINGER));
900
901 link->route_messages--;
902
903 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
904 return 1;
905
906 r = sd_netlink_message_get_errno(m);
907 if (r < 0 && r != -EEXIST)
908 log_link_warning_errno(link, r, "Could not set route: %m");
909
910 if (link->route_messages == 0) {
911 log_link_debug(link, "Routes set");
912 link->static_routes_configured = true;
913 link_check_ready(link);
914 }
915
916 return 1;
917 }
918
919 int link_request_set_routes(Link *link) {
920 enum {
921 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
922 PHASE_GATEWAY, /* Second phase: Routes with a gateway */
923 _PHASE_MAX
924 } phase;
925 Route *rt;
926 int r;
927
928 assert(link);
929 assert(link->network);
930 assert(link->addresses_configured);
931 assert(link->address_messages == 0);
932 assert(link->state != _LINK_STATE_INVALID);
933
934 link_set_state(link, LINK_STATE_CONFIGURING);
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
964 return 0;
965 }
966
967 void link_check_ready(Link *link) {
968 Address *a;
969 Iterator i;
970
971 assert(link);
972
973 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
974 return;
975
976 if (!link->network)
977 return;
978
979 if (!link->addresses_configured)
980 return;
981
982 if (!link->neighbors_configured)
983 return;
984
985 SET_FOREACH(a, link->addresses, i)
986 if (!address_is_ready(a))
987 return;
988
989 if (!link->addresses_ready) {
990 link->addresses_ready = true;
991 link_request_set_routes(link);
992 return;
993 }
994
995 if (!link->static_routes_configured)
996 return;
997
998 if (!link->routing_policy_rules_configured)
999 return;
1000
1001 if (link_has_carrier(link) || !link->network->configure_without_carrier) {
1002
1003 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !(link->ipv4ll_address && link->ipv4ll_route))
1004 return;
1005
1006 if (link_ipv6ll_enabled(link) &&
1007 in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
1008 return;
1009
1010 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
1011 !link->dhcp4_configured &&
1012 !link->dhcp6_configured &&
1013 !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address && link->ipv4ll_route))
1014 /* When DHCP is enabled, at least one protocol must provide an address, or
1015 * an IPv4ll fallback address must be configured. */
1016 return;
1017
1018 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
1019 return;
1020 }
1021
1022 if (link->state != LINK_STATE_CONFIGURED)
1023 link_enter_configured(link);
1024
1025 return;
1026 }
1027
1028 static int link_request_set_neighbors(Link *link) {
1029 Neighbor *neighbor;
1030 int r;
1031
1032 assert(link);
1033 assert(link->network);
1034 assert(link->state != _LINK_STATE_INVALID);
1035
1036 link_set_state(link, LINK_STATE_CONFIGURING);
1037 link->neighbors_configured = false;
1038
1039 LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1040 r = neighbor_configure(neighbor, link, NULL);
1041 if (r < 0) {
1042 log_link_warning_errno(link, r, "Could not set neighbor: %m");
1043 link_enter_failed(link);
1044 return r;
1045 }
1046 }
1047
1048 if (link->neighbor_messages == 0) {
1049 link->neighbors_configured = true;
1050 link_check_ready(link);
1051 } else
1052 log_link_debug(link, "Setting neighbors");
1053
1054 return 0;
1055 }
1056
1057 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1058 int r;
1059
1060 assert(rtnl);
1061 assert(m);
1062 assert(link);
1063 assert(link->ifname);
1064 assert(link->address_messages > 0);
1065 assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1066 LINK_STATE_FAILED, LINK_STATE_LINGER));
1067
1068 link->address_messages--;
1069
1070 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1071 return 1;
1072
1073 r = sd_netlink_message_get_errno(m);
1074 if (r < 0 && r != -EEXIST)
1075 log_link_warning_errno(link, r, "could not set address: %m");
1076 else if (r >= 0)
1077 manager_rtnl_process_address(rtnl, m, link->manager);
1078
1079 if (link->address_messages == 0) {
1080 log_link_debug(link, "Addresses set");
1081 link->addresses_configured = true;
1082 link_check_ready(link);
1083 }
1084
1085 return 1;
1086 }
1087
1088 static int link_set_bridge_fdb(Link *link) {
1089 FdbEntry *fdb_entry;
1090 int r;
1091
1092 LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1093 r = fdb_entry_configure(link, fdb_entry);
1094 if (r < 0)
1095 return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1096 }
1097
1098 return 0;
1099 }
1100
1101 static int link_request_set_addresses(Link *link) {
1102 AddressLabel *label;
1103 Address *ad;
1104 int r;
1105
1106 assert(link);
1107 assert(link->network);
1108 assert(link->state != _LINK_STATE_INVALID);
1109
1110 link_set_state(link, LINK_STATE_CONFIGURING);
1111
1112 /* Reset all *_configured flags we are configuring. */
1113 link->addresses_configured = false;
1114 link->addresses_ready = false;
1115 link->neighbors_configured = false;
1116 link->static_routes_configured = false;
1117 link->routing_policy_rules_configured = false;
1118
1119 r = link_set_bridge_fdb(link);
1120 if (r < 0)
1121 return r;
1122
1123 r = link_request_set_neighbors(link);
1124 if (r < 0)
1125 return r;
1126
1127 LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1128 bool update;
1129
1130 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1131
1132 r = address_configure(ad, link, address_handler, update);
1133 if (r < 0) {
1134 log_link_warning_errno(link, r, "Could not set addresses: %m");
1135 link_enter_failed(link);
1136 return r;
1137 }
1138 if (r > 0)
1139 link->address_messages++;
1140 }
1141
1142 LIST_FOREACH(labels, label, link->network->address_labels) {
1143 r = address_label_configure(label, link, NULL, false);
1144 if (r < 0) {
1145 log_link_warning_errno(link, r, "Could not set address label: %m");
1146 link_enter_failed(link);
1147 return r;
1148 }
1149
1150 link->address_label_messages++;
1151 }
1152
1153 /* now that we can figure out a default address for the dhcp server,
1154 start it */
1155 if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1156 r = dhcp4_server_configure(link);
1157 if (r < 0) {
1158 link_enter_failed(link);
1159 return r;
1160 }
1161 log_link_debug(link, "Offering DHCPv4 leases");
1162 }
1163
1164 if (link->address_messages == 0) {
1165 link->addresses_configured = true;
1166 link_check_ready(link);
1167 } else
1168 log_link_debug(link, "Setting addresses");
1169
1170 return 0;
1171 }
1172
1173 static int link_set_bridge_vlan(Link *link) {
1174 int r;
1175
1176 r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1177 if (r < 0)
1178 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1179
1180 return r;
1181 }
1182
1183 static int link_set_proxy_arp(Link *link) {
1184 int r;
1185
1186 if (!link_proxy_arp_enabled(link))
1187 return 0;
1188
1189 r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1190 if (r < 0)
1191 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1192
1193 return 0;
1194 }
1195
1196 static int link_configure_after_setting_mtu(Link *link);
1197
1198 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1199 int r;
1200
1201 assert(m);
1202 assert(link);
1203 assert(link->ifname);
1204
1205 link->setting_mtu = false;
1206
1207 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1208 return 1;
1209
1210 r = sd_netlink_message_get_errno(m);
1211 if (r < 0) {
1212 log_link_warning_errno(link, r, "Could not set MTU: %m");
1213 return 1;
1214 }
1215
1216 log_link_debug(link, "Setting MTU done.");
1217
1218 if (link->state == LINK_STATE_INITIALIZED)
1219 (void) link_configure_after_setting_mtu(link);
1220
1221 return 1;
1222 }
1223
1224 int link_set_mtu(Link *link, uint32_t mtu) {
1225 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1226 int r;
1227
1228 assert(link);
1229 assert(link->manager);
1230 assert(link->manager->rtnl);
1231
1232 if (mtu == 0 || link->setting_mtu)
1233 return 0;
1234
1235 if (link->mtu == mtu)
1236 return 0;
1237
1238 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1239
1240 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1241 if (r < 0)
1242 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1243
1244 /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1245 * for this interface, then disable IPv6 else enable it. */
1246 (void) link_enable_ipv6(link);
1247
1248 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1249 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1250 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1251
1252 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1253 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1254
1255 mtu = IPV6_MIN_MTU;
1256 }
1257
1258 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1259 if (r < 0)
1260 return log_link_error_errno(link, r, "Could not append MTU: %m");
1261
1262 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1263 link_netlink_destroy_callback, link);
1264 if (r < 0)
1265 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1266
1267 link_ref(link);
1268 link->setting_mtu = true;
1269
1270 return 0;
1271 }
1272
1273 static bool link_reduces_vlan_mtu(Link *link) {
1274 /* See netif_reduces_vlan_mtu() in kernel. */
1275 return streq_ptr(link->kind, "macsec");
1276 }
1277
1278 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1279 uint32_t mtu = 0;
1280 NetDev *dev;
1281 Iterator i;
1282
1283 HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1284 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1285 /* See vlan_dev_change_mtu() in kernel. */
1286 mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1287
1288 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1289 /* See macvlan_change_mtu() in kernel. */
1290 mtu = dev->mtu;
1291
1292 return mtu;
1293 }
1294
1295 static int link_configure_mtu(Link *link) {
1296 uint32_t mtu;
1297
1298 assert(link);
1299 assert(link->network);
1300
1301 if (link->network->mtu > 0)
1302 return link_set_mtu(link, link->network->mtu);
1303
1304 mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1305 if (link->mtu >= mtu)
1306 return 0;
1307
1308 log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1309 "If it is not desired, then please explicitly specify MTUBytes= setting.",
1310 link->mtu, mtu);
1311
1312 return link_set_mtu(link, mtu);
1313 }
1314
1315 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1316 int r;
1317
1318 assert(m);
1319 assert(link);
1320 assert(link->ifname);
1321
1322 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1323 return 1;
1324
1325 r = sd_netlink_message_get_errno(m);
1326 if (r < 0)
1327 log_link_warning_errno(link, r, "Could not set link flags: %m");
1328
1329 return 1;
1330 }
1331
1332 static int link_set_flags(Link *link) {
1333 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1334 unsigned ifi_change = 0;
1335 unsigned ifi_flags = 0;
1336 int r;
1337
1338 assert(link);
1339 assert(link->manager);
1340 assert(link->manager->rtnl);
1341
1342 if (link->flags & IFF_LOOPBACK)
1343 return 0;
1344
1345 if (!link->network)
1346 return 0;
1347
1348 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1349 return 0;
1350
1351 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1352 if (r < 0)
1353 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1354
1355 if (link->network->arp >= 0) {
1356 ifi_change |= IFF_NOARP;
1357 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1358 }
1359
1360 if (link->network->multicast >= 0) {
1361 ifi_change |= IFF_MULTICAST;
1362 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1363 }
1364
1365 if (link->network->allmulticast >= 0) {
1366 ifi_change |= IFF_ALLMULTI;
1367 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1368 }
1369
1370 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1371 if (r < 0)
1372 return log_link_error_errno(link, r, "Could not set link flags: %m");
1373
1374 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1375 link_netlink_destroy_callback, link);
1376 if (r < 0)
1377 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1378
1379 link_ref(link);
1380
1381 return 0;
1382 }
1383
1384 static int link_acquire_ipv6_conf(Link *link) {
1385 int r;
1386
1387 assert(link);
1388
1389 if (link_ipv6_accept_ra_enabled(link)) {
1390 assert(link->ndisc);
1391
1392 log_link_debug(link, "Discovering IPv6 routers");
1393
1394 r = sd_ndisc_start(link->ndisc);
1395 if (r < 0 && r != -EBUSY)
1396 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1397 }
1398
1399 if (link_radv_enabled(link)) {
1400 assert(link->radv);
1401 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1402
1403 log_link_debug(link, "Starting IPv6 Router Advertisements");
1404
1405 r = sd_radv_start(link->radv);
1406 if (r < 0 && r != -EBUSY)
1407 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1408 }
1409
1410 (void) dhcp6_request_prefix_delegation(link);
1411
1412 return 0;
1413 }
1414
1415 static int link_acquire_ipv4_conf(Link *link) {
1416 int r;
1417
1418 assert(link);
1419 assert(link->manager);
1420 assert(link->manager->event);
1421
1422 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1423 assert(link->ipv4ll);
1424
1425 log_link_debug(link, "Acquiring IPv4 link-local address");
1426
1427 r = sd_ipv4ll_start(link->ipv4ll);
1428 if (r < 0)
1429 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1430 }
1431
1432 if (link_dhcp4_enabled(link)) {
1433 assert(link->dhcp_client);
1434
1435 log_link_debug(link, "Acquiring DHCPv4 lease");
1436
1437 r = sd_dhcp_client_start(link->dhcp_client);
1438 if (r < 0)
1439 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1440 }
1441
1442 return 0;
1443 }
1444
1445 static int link_acquire_conf(Link *link) {
1446 int r;
1447
1448 assert(link);
1449
1450 r = link_acquire_ipv4_conf(link);
1451 if (r < 0)
1452 return r;
1453
1454 if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1455 r = link_acquire_ipv6_conf(link);
1456 if (r < 0)
1457 return r;
1458 }
1459
1460 if (link_lldp_emit_enabled(link)) {
1461 r = link_lldp_emit_start(link);
1462 if (r < 0)
1463 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1464 }
1465
1466 return 0;
1467 }
1468
1469 bool link_has_carrier(Link *link) {
1470 /* see Documentation/networking/operstates.txt in the kernel sources */
1471
1472 if (link->kernel_operstate == IF_OPER_UP)
1473 return true;
1474
1475 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1476 /* operstate may not be implemented, so fall back to flags */
1477 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1478 !FLAGS_SET(link->flags, IFF_DORMANT))
1479 return true;
1480
1481 return false;
1482 }
1483
1484 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1485 int r;
1486
1487 assert(link);
1488
1489 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1490 return 1;
1491
1492 r = sd_netlink_message_get_errno(m);
1493 if (r < 0)
1494 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1495
1496 return 1;
1497 }
1498
1499 static int link_configure_addrgen_mode(Link *link) {
1500 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1501 uint8_t ipv6ll_mode;
1502 int r;
1503
1504 assert(link);
1505 assert(link->network);
1506 assert(link->manager);
1507 assert(link->manager->rtnl);
1508
1509 if (!socket_ipv6_is_supported())
1510 return 0;
1511
1512 log_link_debug(link, "Setting address genmode for link");
1513
1514 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1515 if (r < 0)
1516 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1517
1518 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1519 if (r < 0)
1520 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1521
1522 r = sd_netlink_message_open_container(req, AF_INET6);
1523 if (r < 0)
1524 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1525
1526 if (!link_ipv6ll_enabled(link))
1527 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1528 else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1529 /* The file may not exist. And event if it exists, when stable_secret is unset,
1530 * reading the file fails with EIO. */
1531 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1532 else
1533 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1534
1535 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1536 if (r < 0)
1537 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1538
1539 r = sd_netlink_message_close_container(req);
1540 if (r < 0)
1541 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1542
1543 r = sd_netlink_message_close_container(req);
1544 if (r < 0)
1545 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1546
1547 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1548 link_netlink_destroy_callback, link);
1549 if (r < 0)
1550 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1551
1552 link_ref(link);
1553
1554 return 0;
1555 }
1556
1557 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1558 int r;
1559
1560 assert(link);
1561
1562 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1563 return 1;
1564
1565 r = sd_netlink_message_get_errno(m);
1566 if (r < 0)
1567 /* we warn but don't fail the link, as it may be brought up later */
1568 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1569
1570 return 1;
1571 }
1572
1573 static int link_up(Link *link) {
1574 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1575 int r;
1576
1577 assert(link);
1578 assert(link->network);
1579 assert(link->manager);
1580 assert(link->manager->rtnl);
1581
1582 log_link_debug(link, "Bringing link up");
1583
1584 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1585 if (r < 0)
1586 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1587
1588 /* set it free if not enslaved with networkd */
1589 if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1590 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1591 if (r < 0)
1592 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1593 }
1594
1595 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1596 if (r < 0)
1597 return log_link_error_errno(link, r, "Could not set link flags: %m");
1598
1599 if (link->network->mac) {
1600 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1601 if (r < 0)
1602 return log_link_error_errno(link, r, "Could not set MAC address: %m");
1603 }
1604
1605 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1606 link_netlink_destroy_callback, link);
1607 if (r < 0)
1608 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1609
1610 link_ref(link);
1611
1612 return 0;
1613 }
1614
1615 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1616 int r;
1617
1618 assert(link);
1619
1620 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1621 return 1;
1622
1623 r = sd_netlink_message_get_errno(m);
1624 if (r < 0)
1625 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1626
1627 return 1;
1628 }
1629
1630 int link_down(Link *link, link_netlink_message_handler_t callback) {
1631 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1632 int r;
1633
1634 assert(link);
1635 assert(link->manager);
1636 assert(link->manager->rtnl);
1637
1638 log_link_debug(link, "Bringing link down");
1639
1640 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1641 RTM_SETLINK, link->ifindex);
1642 if (r < 0)
1643 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1644
1645 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1646 if (r < 0)
1647 return log_link_error_errno(link, r, "Could not set link flags: %m");
1648
1649 r = netlink_call_async(link->manager->rtnl, NULL, req,
1650 callback ?: link_down_handler,
1651 link_netlink_destroy_callback, link);
1652 if (r < 0)
1653 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1654
1655 link_ref(link);
1656
1657 return 0;
1658 }
1659
1660 static int link_handle_bound_to_list(Link *link) {
1661 Link *l;
1662 Iterator i;
1663 int r;
1664 bool required_up = false;
1665 bool link_is_up = false;
1666
1667 assert(link);
1668
1669 if (hashmap_isempty(link->bound_to_links))
1670 return 0;
1671
1672 if (link->flags & IFF_UP)
1673 link_is_up = true;
1674
1675 HASHMAP_FOREACH (l, link->bound_to_links, i)
1676 if (link_has_carrier(l)) {
1677 required_up = true;
1678 break;
1679 }
1680
1681 if (!required_up && link_is_up) {
1682 r = link_down(link, NULL);
1683 if (r < 0)
1684 return r;
1685 } else if (required_up && !link_is_up) {
1686 r = link_up(link);
1687 if (r < 0)
1688 return r;
1689 }
1690
1691 return 0;
1692 }
1693
1694 static int link_handle_bound_by_list(Link *link) {
1695 Iterator i;
1696 Link *l;
1697 int r;
1698
1699 assert(link);
1700
1701 if (hashmap_isempty(link->bound_by_links))
1702 return 0;
1703
1704 HASHMAP_FOREACH (l, link->bound_by_links, i) {
1705 r = link_handle_bound_to_list(l);
1706 if (r < 0)
1707 return r;
1708 }
1709
1710 return 0;
1711 }
1712
1713 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1714 int r;
1715
1716 assert(link);
1717 assert(carrier);
1718
1719 if (link == carrier)
1720 return 0;
1721
1722 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1723 return 0;
1724
1725 r = hashmap_ensure_allocated(h, NULL);
1726 if (r < 0)
1727 return r;
1728
1729 r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1730 if (r < 0)
1731 return r;
1732
1733 return 0;
1734 }
1735
1736 static int link_new_bound_by_list(Link *link) {
1737 Manager *m;
1738 Link *carrier;
1739 Iterator i;
1740 int r;
1741 bool list_updated = false;
1742
1743 assert(link);
1744 assert(link->manager);
1745
1746 m = link->manager;
1747
1748 HASHMAP_FOREACH(carrier, m->links, i) {
1749 if (!carrier->network)
1750 continue;
1751
1752 if (strv_isempty(carrier->network->bind_carrier))
1753 continue;
1754
1755 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
1756 r = link_put_carrier(link, carrier, &link->bound_by_links);
1757 if (r < 0)
1758 return r;
1759
1760 list_updated = true;
1761 }
1762 }
1763
1764 if (list_updated)
1765 link_dirty(link);
1766
1767 HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
1768 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1769 if (r < 0)
1770 return r;
1771
1772 link_dirty(carrier);
1773 }
1774
1775 return 0;
1776 }
1777
1778 static int link_new_bound_to_list(Link *link) {
1779 Manager *m;
1780 Link *carrier;
1781 Iterator i;
1782 int r;
1783 bool list_updated = false;
1784
1785 assert(link);
1786 assert(link->manager);
1787
1788 if (!link->network)
1789 return 0;
1790
1791 if (strv_isempty(link->network->bind_carrier))
1792 return 0;
1793
1794 m = link->manager;
1795
1796 HASHMAP_FOREACH (carrier, m->links, i) {
1797 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
1798 r = link_put_carrier(link, carrier, &link->bound_to_links);
1799 if (r < 0)
1800 return r;
1801
1802 list_updated = true;
1803 }
1804 }
1805
1806 if (list_updated)
1807 link_dirty(link);
1808
1809 HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
1810 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
1811 if (r < 0)
1812 return r;
1813
1814 link_dirty(carrier);
1815 }
1816
1817 return 0;
1818 }
1819
1820 static int link_new_carrier_maps(Link *link) {
1821 int r;
1822
1823 r = link_new_bound_by_list(link);
1824 if (r < 0)
1825 return r;
1826
1827 r = link_handle_bound_by_list(link);
1828 if (r < 0)
1829 return r;
1830
1831 r = link_new_bound_to_list(link);
1832 if (r < 0)
1833 return r;
1834
1835 r = link_handle_bound_to_list(link);
1836 if (r < 0)
1837 return r;
1838
1839 return 0;
1840 }
1841
1842 static void link_free_bound_to_list(Link *link) {
1843 Link *bound_to;
1844 Iterator i;
1845
1846 HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
1847 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
1848
1849 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
1850 link_dirty(bound_to);
1851 }
1852
1853 return;
1854 }
1855
1856 static void link_free_bound_by_list(Link *link) {
1857 Link *bound_by;
1858 Iterator i;
1859
1860 HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
1861 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
1862
1863 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
1864 link_dirty(bound_by);
1865 link_handle_bound_to_list(bound_by);
1866 }
1867 }
1868
1869 return;
1870 }
1871
1872 static void link_free_carrier_maps(Link *link) {
1873 bool list_updated = false;
1874
1875 assert(link);
1876
1877 if (!hashmap_isempty(link->bound_to_links)) {
1878 link_free_bound_to_list(link);
1879 list_updated = true;
1880 }
1881
1882 if (!hashmap_isempty(link->bound_by_links)) {
1883 link_free_bound_by_list(link);
1884 list_updated = true;
1885 }
1886
1887 if (list_updated)
1888 link_dirty(link);
1889
1890 return;
1891 }
1892
1893 static int link_append_to_master(Link *link, NetDev *netdev) {
1894 Link *master;
1895 int r;
1896
1897 assert(link);
1898 assert(netdev);
1899
1900 r = link_get(link->manager, netdev->ifindex, &master);
1901 if (r < 0)
1902 return r;
1903
1904 r = set_ensure_allocated(&master->slaves, NULL);
1905 if (r < 0)
1906 return r;
1907
1908 r = set_put(master->slaves, link);
1909 if (r < 0)
1910 return r;
1911
1912 link_ref(link);
1913 return 0;
1914 }
1915
1916 static void link_drop_from_master(Link *link, NetDev *netdev) {
1917 Link *master;
1918
1919 assert(link);
1920
1921 if (!link->manager || !netdev)
1922 return;
1923
1924 if (link_get(link->manager, netdev->ifindex, &master) < 0)
1925 return;
1926
1927 link_unref(set_remove(master->slaves, link));
1928 }
1929
1930 static void link_detach_from_manager(Link *link) {
1931 if (!link || !link->manager)
1932 return;
1933
1934 link_unref(set_remove(link->manager->links_requesting_uuid, link));
1935 link_clean(link);
1936
1937 /* The following must be called at last. */
1938 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
1939 link_unref(link);
1940 }
1941
1942 void link_drop(Link *link) {
1943 if (!link || link->state == LINK_STATE_LINGER)
1944 return;
1945
1946 link_set_state(link, LINK_STATE_LINGER);
1947
1948 link_free_carrier_maps(link);
1949
1950 if (link->network) {
1951 link_drop_from_master(link, link->network->bridge);
1952 link_drop_from_master(link, link->network->bond);
1953 }
1954
1955 log_link_debug(link, "Link removed");
1956
1957 (void) unlink(link->state_file);
1958 link_detach_from_manager(link);
1959 }
1960
1961 static int link_joined(Link *link) {
1962 int r;
1963
1964 assert(link);
1965 assert(link->network);
1966
1967 if (!hashmap_isempty(link->bound_to_links)) {
1968 r = link_handle_bound_to_list(link);
1969 if (r < 0)
1970 return r;
1971 } else if (!(link->flags & IFF_UP)) {
1972 r = link_up(link);
1973 if (r < 0) {
1974 link_enter_failed(link);
1975 return r;
1976 }
1977 }
1978
1979 if (link->network->bridge) {
1980 r = link_set_bridge(link);
1981 if (r < 0)
1982 log_link_error_errno(link, r, "Could not set bridge message: %m");
1983
1984 r = link_append_to_master(link, link->network->bridge);
1985 if (r < 0)
1986 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
1987 }
1988
1989 if (link->network->bond) {
1990 r = link_set_bond(link);
1991 if (r < 0)
1992 log_link_error_errno(link, r, "Could not set bond message: %m");
1993
1994 r = link_append_to_master(link, link->network->bond);
1995 if (r < 0)
1996 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
1997 }
1998
1999 if (link->network->use_br_vlan &&
2000 (link->network->bridge || streq_ptr("bridge", link->kind))) {
2001 r = link_set_bridge_vlan(link);
2002 if (r < 0)
2003 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2004 }
2005
2006 /* Skip setting up addresses until it gets carrier,
2007 or it would try to set addresses twice,
2008 which is bad for non-idempotent steps. */
2009 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2010 return 0;
2011
2012 return link_request_set_addresses(link);
2013 }
2014
2015 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2016 int r;
2017
2018 assert(link);
2019 assert(link->network);
2020 assert(link->enslaving > 0);
2021
2022 link->enslaving--;
2023
2024 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2025 return 1;
2026
2027 r = sd_netlink_message_get_errno(m);
2028 if (r < 0 && r != -EEXIST) {
2029 log_link_error_errno(link, r, "Could not join netdev: %m");
2030 link_enter_failed(link);
2031 return 1;
2032 } else
2033 log_link_debug(link, "Joined netdev");
2034
2035 if (link->enslaving == 0) {
2036 link_joined(link);
2037 }
2038
2039 return 1;
2040 }
2041
2042 static int link_enter_join_netdev(Link *link) {
2043 NetDev *netdev;
2044 Iterator i;
2045 int r;
2046
2047 assert(link);
2048 assert(link->network);
2049 assert(link->state == LINK_STATE_INITIALIZED);
2050
2051 link_set_state(link, LINK_STATE_CONFIGURING);
2052
2053 link_dirty(link);
2054 link->enslaving = 0;
2055
2056 if (link->network->bond) {
2057 if (link->network->bond->state == NETDEV_STATE_READY &&
2058 link->network->bond->ifindex == link->master_ifindex)
2059 return link_joined(link);
2060
2061 log_struct(LOG_DEBUG,
2062 LOG_LINK_INTERFACE(link),
2063 LOG_NETDEV_INTERFACE(link->network->bond),
2064 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2065
2066 link->enslaving++;
2067
2068 r = netdev_join(link->network->bond, link, netdev_join_handler);
2069 if (r < 0) {
2070 log_struct_errno(LOG_WARNING, r,
2071 LOG_LINK_INTERFACE(link),
2072 LOG_NETDEV_INTERFACE(link->network->bond),
2073 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2074 link_enter_failed(link);
2075 return r;
2076 }
2077 }
2078
2079 if (link->network->bridge) {
2080 log_struct(LOG_DEBUG,
2081 LOG_LINK_INTERFACE(link),
2082 LOG_NETDEV_INTERFACE(link->network->bridge),
2083 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2084
2085 link->enslaving++;
2086
2087 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2088 if (r < 0) {
2089 log_struct_errno(LOG_WARNING, r,
2090 LOG_LINK_INTERFACE(link),
2091 LOG_NETDEV_INTERFACE(link->network->bridge),
2092 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2093 link_enter_failed(link);
2094 return r;
2095 }
2096 }
2097
2098 if (link->network->vrf) {
2099 log_struct(LOG_DEBUG,
2100 LOG_LINK_INTERFACE(link),
2101 LOG_NETDEV_INTERFACE(link->network->vrf),
2102 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2103
2104 link->enslaving++;
2105
2106 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2107 if (r < 0) {
2108 log_struct_errno(LOG_WARNING, r,
2109 LOG_LINK_INTERFACE(link),
2110 LOG_NETDEV_INTERFACE(link->network->vrf),
2111 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2112 link_enter_failed(link);
2113 return r;
2114 }
2115 }
2116
2117 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2118
2119 if (netdev->ifindex > 0)
2120 /* Assume already enslaved. */
2121 continue;
2122
2123 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2124 continue;
2125
2126 log_struct(LOG_DEBUG,
2127 LOG_LINK_INTERFACE(link),
2128 LOG_NETDEV_INTERFACE(netdev),
2129 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2130
2131 link->enslaving++;
2132
2133 r = netdev_join(netdev, link, netdev_join_handler);
2134 if (r < 0) {
2135 log_struct_errno(LOG_WARNING, r,
2136 LOG_LINK_INTERFACE(link),
2137 LOG_NETDEV_INTERFACE(netdev),
2138 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2139 link_enter_failed(link);
2140 return r;
2141 }
2142 }
2143
2144 if (link->enslaving == 0)
2145 return link_joined(link);
2146
2147 return 0;
2148 }
2149
2150 static int link_set_ipv4_forward(Link *link) {
2151 int r;
2152
2153 if (!link_ipv4_forward_enabled(link))
2154 return 0;
2155
2156 /* We propagate the forwarding flag from one interface to the
2157 * global setting one way. This means: as long as at least one
2158 * interface was configured at any time that had IP forwarding
2159 * enabled the setting will stay on for good. We do this
2160 * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2161 * somewhat in sync (see below). */
2162
2163 r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2164 if (r < 0)
2165 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2166
2167 return 0;
2168 }
2169
2170 static int link_set_ipv6_forward(Link *link) {
2171 int r;
2172
2173 if (!link_ipv6_forward_enabled(link))
2174 return 0;
2175
2176 /* On Linux, the IPv6 stack does not know a per-interface
2177 * packet forwarding setting: either packet forwarding is on
2178 * for all, or off for all. We hence don't bother with a
2179 * per-interface setting, but simply propagate the interface
2180 * flag, if it is set, to the global flag, one-way. Note that
2181 * while IPv4 would allow a per-interface flag, we expose the
2182 * same behaviour there and also propagate the setting from
2183 * one to all, to keep things simple (see above). */
2184
2185 r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2186 if (r < 0)
2187 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2188
2189 return 0;
2190 }
2191
2192 static int link_set_ipv6_privacy_extensions(Link *link) {
2193 IPv6PrivacyExtensions s;
2194 int r;
2195
2196 s = link_ipv6_privacy_extensions(link);
2197 if (s < 0)
2198 return 0;
2199
2200 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2201 if (r < 0)
2202 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2203
2204 return 0;
2205 }
2206
2207 static int link_set_ipv6_accept_ra(Link *link) {
2208 int r;
2209
2210 /* Make this a NOP if IPv6 is not available */
2211 if (!socket_ipv6_is_supported())
2212 return 0;
2213
2214 if (link->flags & IFF_LOOPBACK)
2215 return 0;
2216
2217 if (!link->network)
2218 return 0;
2219
2220 r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2221 if (r < 0)
2222 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2223
2224 return 0;
2225 }
2226
2227 static int link_set_ipv6_dad_transmits(Link *link) {
2228 int r;
2229
2230 /* Make this a NOP if IPv6 is not available */
2231 if (!socket_ipv6_is_supported())
2232 return 0;
2233
2234 if (link->flags & IFF_LOOPBACK)
2235 return 0;
2236
2237 if (!link->network)
2238 return 0;
2239
2240 if (link->network->ipv6_dad_transmits < 0)
2241 return 0;
2242
2243 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2244 if (r < 0)
2245 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2246
2247 return 0;
2248 }
2249
2250 static int link_set_ipv6_hop_limit(Link *link) {
2251 int r;
2252
2253 /* Make this a NOP if IPv6 is not available */
2254 if (!socket_ipv6_is_supported())
2255 return 0;
2256
2257 if (link->flags & IFF_LOOPBACK)
2258 return 0;
2259
2260 if (!link->network)
2261 return 0;
2262
2263 if (link->network->ipv6_hop_limit < 0)
2264 return 0;
2265
2266 r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2267 if (r < 0)
2268 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2269
2270 return 0;
2271 }
2272
2273 static int link_set_ipv6_mtu(Link *link) {
2274 int r;
2275
2276 /* Make this a NOP if IPv6 is not available */
2277 if (!socket_ipv6_is_supported())
2278 return 0;
2279
2280 if (link->flags & IFF_LOOPBACK)
2281 return 0;
2282
2283 if (link->network->ipv6_mtu == 0)
2284 return 0;
2285
2286 r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2287 if (r < 0)
2288 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2289
2290 return 0;
2291 }
2292
2293 static bool link_is_static_address_configured(Link *link, Address *address) {
2294 Address *net_address;
2295
2296 assert(link);
2297 assert(address);
2298
2299 if (!link->network)
2300 return false;
2301
2302 LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2303 if (address_equal(net_address, address))
2304 return true;
2305
2306 return false;
2307 }
2308
2309 static bool link_is_static_route_configured(Link *link, Route *route) {
2310 Route *net_route;
2311
2312 assert(link);
2313 assert(route);
2314
2315 if (!link->network)
2316 return false;
2317
2318 LIST_FOREACH(routes, net_route, link->network->static_routes)
2319 if (route_equal(net_route, route))
2320 return true;
2321
2322 return false;
2323 }
2324
2325 static bool link_address_is_dynamic(Link *link, Address *address) {
2326 Route *route;
2327 Iterator i;
2328
2329 assert(link);
2330 assert(address);
2331
2332 if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2333 return true;
2334
2335 /* Even when the address is leased from a DHCP server, networkd assign the address
2336 * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2337 * corresponding routes with RTPROT_DHCP. */
2338 SET_FOREACH(route, link->routes_foreign, i) {
2339 if (route->protocol != RTPROT_DHCP)
2340 continue;
2341
2342 if (address->family != route->family)
2343 continue;
2344
2345 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2346 return true;
2347 }
2348
2349 return false;
2350 }
2351
2352 static int link_drop_foreign_config(Link *link) {
2353 Address *address;
2354 Route *route;
2355 Iterator i;
2356 int r;
2357
2358 SET_FOREACH(address, link->addresses_foreign, i) {
2359 /* we consider IPv6LL addresses to be managed by the kernel */
2360 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2361 continue;
2362
2363 if (link_address_is_dynamic(link, address)) {
2364 if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2365 continue;
2366 } else if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2367 continue;
2368
2369 if (link_is_static_address_configured(link, address)) {
2370 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2371 if (r < 0)
2372 return log_link_error_errno(link, r, "Failed to add address: %m");
2373 } else {
2374 r = address_remove(address, link, NULL);
2375 if (r < 0)
2376 return r;
2377 }
2378 }
2379
2380 SET_FOREACH(route, link->routes_foreign, i) {
2381 /* do not touch routes managed by the kernel */
2382 if (route->protocol == RTPROT_KERNEL)
2383 continue;
2384
2385 if (route->protocol == RTPROT_STATIC &&
2386 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2387 continue;
2388
2389 if (route->protocol == RTPROT_DHCP &&
2390 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2391 continue;
2392
2393 if (link_is_static_route_configured(link, route)) {
2394 r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2395 if (r < 0)
2396 return r;
2397 } else {
2398 r = route_remove(route, link, NULL);
2399 if (r < 0)
2400 return r;
2401 }
2402 }
2403
2404 return 0;
2405 }
2406
2407 static int link_drop_config(Link *link) {
2408 Address *address, *pool_address;
2409 Route *route;
2410 Iterator i;
2411 int r;
2412
2413 SET_FOREACH(address, link->addresses, i) {
2414 /* we consider IPv6LL addresses to be managed by the kernel */
2415 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2416 continue;
2417
2418 r = address_remove(address, link, NULL);
2419 if (r < 0)
2420 return r;
2421
2422 /* If this address came from an address pool, clean up the pool */
2423 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2424 if (address_equal(address, pool_address)) {
2425 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2426 address_free(pool_address);
2427 break;
2428 }
2429 }
2430 }
2431
2432 SET_FOREACH(route, link->routes, i) {
2433 /* do not touch routes managed by the kernel */
2434 if (route->protocol == RTPROT_KERNEL)
2435 continue;
2436
2437 r = route_remove(route, link, NULL);
2438 if (r < 0)
2439 return r;
2440 }
2441
2442 ndisc_flush(link);
2443
2444 return 0;
2445 }
2446
2447 static int link_configure(Link *link) {
2448 int r;
2449
2450 assert(link);
2451 assert(link->network);
2452 assert(link->state == LINK_STATE_INITIALIZED);
2453
2454 if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
2455 return link_configure_can(link);
2456
2457 /* Drop foreign config, but ignore loopback or critical devices.
2458 * We do not want to remove loopback address or addresses used for root NFS. */
2459 if (!(link->flags & IFF_LOOPBACK) &&
2460 link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
2461 r = link_drop_foreign_config(link);
2462 if (r < 0)
2463 return r;
2464 }
2465
2466 r = link_set_proxy_arp(link);
2467 if (r < 0)
2468 return r;
2469
2470 r = ipv6_proxy_ndp_addresses_configure(link);
2471 if (r < 0)
2472 return r;
2473
2474 r = link_set_ipv4_forward(link);
2475 if (r < 0)
2476 return r;
2477
2478 r = link_set_ipv6_forward(link);
2479 if (r < 0)
2480 return r;
2481
2482 r = link_set_ipv6_privacy_extensions(link);
2483 if (r < 0)
2484 return r;
2485
2486 r = link_set_ipv6_accept_ra(link);
2487 if (r < 0)
2488 return r;
2489
2490 r = link_set_ipv6_dad_transmits(link);
2491 if (r < 0)
2492 return r;
2493
2494 r = link_set_ipv6_hop_limit(link);
2495 if (r < 0)
2496 return r;
2497
2498 r = link_set_flags(link);
2499 if (r < 0)
2500 return r;
2501
2502 r = link_set_ipv6_mtu(link);
2503 if (r < 0)
2504 return r;
2505
2506 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
2507 r = ipv4ll_configure(link);
2508 if (r < 0)
2509 return r;
2510 }
2511
2512 if (link_dhcp4_enabled(link)) {
2513 r = dhcp4_set_promote_secondaries(link);
2514 if (r < 0)
2515 return r;
2516
2517 r = dhcp4_configure(link);
2518 if (r < 0)
2519 return r;
2520 }
2521
2522 if (link_dhcp4_server_enabled(link)) {
2523 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2524 if (r < 0)
2525 return r;
2526
2527 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2528 if (r < 0)
2529 return r;
2530 }
2531
2532 if (link_dhcp6_enabled(link) ||
2533 link_ipv6_accept_ra_enabled(link)) {
2534 r = dhcp6_configure(link);
2535 if (r < 0)
2536 return r;
2537 }
2538
2539 if (link_ipv6_accept_ra_enabled(link)) {
2540 r = ndisc_configure(link);
2541 if (r < 0)
2542 return r;
2543 }
2544
2545 if (link_radv_enabled(link)) {
2546 r = radv_configure(link);
2547 if (r < 0)
2548 return r;
2549 }
2550
2551 if (link_lldp_rx_enabled(link)) {
2552 r = link_lldp_rx_configure(link);
2553 if (r < 0)
2554 return r;
2555 }
2556
2557 r = link_configure_mtu(link);
2558 if (r < 0)
2559 return r;
2560
2561 r = link_configure_addrgen_mode(link);
2562 if (r < 0)
2563 return r;
2564
2565 return link_configure_after_setting_mtu(link);
2566 }
2567
2568 static int link_configure_after_setting_mtu(Link *link) {
2569 int r;
2570
2571 assert(link);
2572 assert(link->network);
2573 assert(link->state == LINK_STATE_INITIALIZED);
2574
2575 if (link->setting_mtu)
2576 return 0;
2577
2578 if (link_has_carrier(link) || link->network->configure_without_carrier) {
2579 r = link_acquire_conf(link);
2580 if (r < 0)
2581 return r;
2582 }
2583
2584 return link_enter_join_netdev(link);
2585 }
2586
2587 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
2588 assert(duid);
2589
2590 if (duid->raw_data_len > 0)
2591 return 0;
2592
2593 if (duid->type != DUID_TYPE_UUID)
2594 return -EINVAL;
2595
2596 memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
2597 duid->raw_data_len = sizeof(sd_id128_t);
2598
2599 return 1;
2600 }
2601
2602 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
2603 Manager *manager = userdata;
2604 const sd_bus_error *e;
2605 const void *a;
2606 size_t sz;
2607 DUID *duid;
2608 Link *link;
2609 int r;
2610
2611 assert(m);
2612 assert(manager);
2613
2614 e = sd_bus_message_get_error(m);
2615 if (e) {
2616 log_error_errno(sd_bus_error_get_errno(e),
2617 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
2618 e->message);
2619 goto configure;
2620 }
2621
2622 r = sd_bus_message_read_array(m, 'y', &a, &sz);
2623 if (r < 0)
2624 goto configure;
2625
2626 if (sz != sizeof(sd_id128_t)) {
2627 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
2628 goto configure;
2629 }
2630
2631 memcpy(&manager->product_uuid, a, sz);
2632 while ((duid = set_steal_first(manager->duids_requesting_uuid)))
2633 (void) duid_set_uuid(duid, manager->product_uuid);
2634
2635 manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
2636
2637 configure:
2638 while ((link = set_steal_first(manager->links_requesting_uuid))) {
2639 r = link_configure(link);
2640 if (r < 0)
2641 log_link_error_errno(link, r, "Failed to configure link: %m");
2642 }
2643
2644 manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
2645
2646 /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
2647 * even if the method fails. */
2648 manager->has_product_uuid = true;
2649
2650 return 1;
2651 }
2652
2653 static bool link_requires_uuid(Link *link) {
2654 const DUID *duid;
2655
2656 assert(link);
2657 assert(link->manager);
2658 assert(link->network);
2659
2660 duid = link_get_duid(link);
2661 if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
2662 return false;
2663
2664 if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
2665 return true;
2666
2667 if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
2668 return true;
2669
2670 return false;
2671 }
2672
2673 static int link_configure_duid(Link *link) {
2674 Manager *m;
2675 DUID *duid;
2676 int r;
2677
2678 assert(link);
2679 assert(link->manager);
2680 assert(link->network);
2681
2682 m = link->manager;
2683 duid = link_get_duid(link);
2684
2685 if (!link_requires_uuid(link))
2686 return 1;
2687
2688 if (m->has_product_uuid) {
2689 (void) duid_set_uuid(duid, m->product_uuid);
2690 return 1;
2691 }
2692
2693 if (!m->links_requesting_uuid) {
2694 r = manager_request_product_uuid(m, link);
2695 if (r < 0) {
2696 if (r == -ENOMEM)
2697 return r;
2698
2699 log_link_warning_errno(link, r,
2700 "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
2701 return 1;
2702 }
2703 } else {
2704 r = set_put(m->links_requesting_uuid, link);
2705 if (r < 0)
2706 return log_oom();
2707
2708 r = set_put(m->duids_requesting_uuid, duid);
2709 if (r < 0)
2710 return log_oom();
2711 }
2712
2713 return 0;
2714 }
2715
2716 static int link_initialized_and_synced(Link *link) {
2717 Network *network;
2718 int r;
2719
2720 assert(link);
2721 assert(link->ifname);
2722 assert(link->manager);
2723
2724 /* We may get called either from the asynchronous netlink callback,
2725 * or directly for link_add() if running in a container. See link_add(). */
2726 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
2727 return 0;
2728
2729 log_link_debug(link, "Link state is up-to-date");
2730 link_set_state(link, LINK_STATE_INITIALIZED);
2731
2732 r = link_new_bound_by_list(link);
2733 if (r < 0)
2734 return r;
2735
2736 r = link_handle_bound_by_list(link);
2737 if (r < 0)
2738 return r;
2739
2740 if (!link->network) {
2741 r = network_get(link->manager, link->sd_device, link->ifname,
2742 &link->mac, &network);
2743 if (r == -ENOENT) {
2744 link_enter_unmanaged(link);
2745 return 0;
2746 } else if (r == 0 && network->unmanaged) {
2747 link_enter_unmanaged(link);
2748 return 0;
2749 } else if (r < 0)
2750 return r;
2751
2752 if (link->flags & IFF_LOOPBACK) {
2753 if (network->link_local != ADDRESS_FAMILY_NO)
2754 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2755
2756 if (network->dhcp != ADDRESS_FAMILY_NO)
2757 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2758
2759 if (network->dhcp_server)
2760 log_link_debug(link, "Ignoring DHCP server for loopback link");
2761 }
2762
2763 r = network_apply(network, link);
2764 if (r < 0)
2765 return r;
2766 }
2767
2768 r = link_new_bound_to_list(link);
2769 if (r < 0)
2770 return r;
2771
2772 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
2773 * link_configure() is called later asynchronously. */
2774 r = link_configure_duid(link);
2775 if (r <= 0)
2776 return r;
2777
2778 r = link_configure(link);
2779 if (r < 0)
2780 return r;
2781
2782 return 0;
2783 }
2784
2785 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2786 (void) link_initialized_and_synced(link);
2787 return 1;
2788 }
2789
2790 int link_initialized(Link *link, sd_device *device) {
2791 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2792 int r;
2793
2794 assert(link);
2795 assert(link->manager);
2796 assert(link->manager->rtnl);
2797 assert(device);
2798
2799 if (link->state != LINK_STATE_PENDING)
2800 return 0;
2801
2802 if (link->sd_device)
2803 return 0;
2804
2805 log_link_debug(link, "udev initialized link");
2806 link_set_state(link, LINK_STATE_INITIALIZED);
2807
2808 link->sd_device = sd_device_ref(device);
2809
2810 /* udev has initialized the link, but we don't know if we have yet
2811 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2812 * when it returns we know that the pending NEWLINKs have already been
2813 * processed and that we are up-to-date */
2814
2815 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2816 link->ifindex);
2817 if (r < 0)
2818 return r;
2819
2820 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
2821 link_netlink_destroy_callback, link);
2822 if (r < 0)
2823 return r;
2824
2825 link_ref(link);
2826
2827 return 0;
2828 }
2829
2830 static int link_load(Link *link) {
2831 _cleanup_free_ char *network_file = NULL,
2832 *addresses = NULL,
2833 *routes = NULL,
2834 *dhcp4_address = NULL,
2835 *ipv4ll_address = NULL;
2836 union in_addr_union address;
2837 union in_addr_union route_dst;
2838 const char *p;
2839 int r;
2840
2841 assert(link);
2842
2843 r = parse_env_file(NULL, link->state_file,
2844 "NETWORK_FILE", &network_file,
2845 "ADDRESSES", &addresses,
2846 "ROUTES", &routes,
2847 "DHCP4_ADDRESS", &dhcp4_address,
2848 "IPV4LL_ADDRESS", &ipv4ll_address);
2849 if (r < 0 && r != -ENOENT)
2850 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
2851
2852 if (network_file) {
2853 Network *network;
2854 char *suffix;
2855
2856 /* drop suffix */
2857 suffix = strrchr(network_file, '.');
2858 if (!suffix) {
2859 log_link_debug(link, "Failed to get network name from %s", network_file);
2860 goto network_file_fail;
2861 }
2862 *suffix = '\0';
2863
2864 r = network_get_by_name(link->manager, basename(network_file), &network);
2865 if (r < 0) {
2866 log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
2867 goto network_file_fail;
2868 }
2869
2870 r = network_apply(network, link);
2871 if (r < 0)
2872 return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
2873 }
2874
2875 network_file_fail:
2876
2877 if (addresses) {
2878 p = addresses;
2879
2880 for (;;) {
2881 _cleanup_free_ char *address_str = NULL;
2882 char *prefixlen_str;
2883 int family;
2884 unsigned char prefixlen;
2885
2886 r = extract_first_word(&p, &address_str, NULL, 0);
2887 if (r < 0) {
2888 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
2889 continue;
2890 }
2891 if (r == 0)
2892 break;
2893
2894 prefixlen_str = strchr(address_str, '/');
2895 if (!prefixlen_str) {
2896 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
2897 continue;
2898 }
2899
2900 *prefixlen_str++ = '\0';
2901
2902 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
2903 if (r != 1) {
2904 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
2905 continue;
2906 }
2907
2908 r = in_addr_from_string_auto(address_str, &family, &address);
2909 if (r < 0) {
2910 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
2911 continue;
2912 }
2913
2914 r = address_add(link, family, &address, prefixlen, NULL);
2915 if (r < 0)
2916 return log_link_error_errno(link, r, "Failed to add address: %m");
2917 }
2918 }
2919
2920 if (routes) {
2921 p = routes;
2922
2923 for (;;) {
2924 Route *route;
2925 _cleanup_free_ char *route_str = NULL;
2926 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
2927 usec_t lifetime;
2928 char *prefixlen_str;
2929 int family;
2930 unsigned char prefixlen, tos, table;
2931 uint32_t priority;
2932
2933 r = extract_first_word(&p, &route_str, NULL, 0);
2934 if (r < 0) {
2935 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
2936 continue;
2937 }
2938 if (r == 0)
2939 break;
2940
2941 prefixlen_str = strchr(route_str, '/');
2942 if (!prefixlen_str) {
2943 log_link_debug(link, "Failed to parse route %s", route_str);
2944 continue;
2945 }
2946
2947 *prefixlen_str++ = '\0';
2948
2949 r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
2950 if (r != 5) {
2951 log_link_debug(link,
2952 "Failed to parse destination prefix length, tos, priority, table or expiration %s",
2953 prefixlen_str);
2954 continue;
2955 }
2956
2957 r = in_addr_from_string_auto(route_str, &family, &route_dst);
2958 if (r < 0) {
2959 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
2960 continue;
2961 }
2962
2963 r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
2964 if (r < 0)
2965 return log_link_error_errno(link, r, "Failed to add route: %m");
2966
2967 if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
2968 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
2969 0, route_expire_handler, route);
2970 if (r < 0)
2971 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
2972 }
2973
2974 route->lifetime = lifetime;
2975 sd_event_source_unref(route->expire);
2976 route->expire = TAKE_PTR(expire);
2977 }
2978 }
2979
2980 if (dhcp4_address) {
2981 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
2982 if (r < 0) {
2983 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
2984 goto dhcp4_address_fail;
2985 }
2986
2987 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
2988 if (r < 0)
2989 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
2990
2991 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
2992 if (r < 0)
2993 return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
2994 }
2995
2996 dhcp4_address_fail:
2997
2998 if (ipv4ll_address) {
2999 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3000 if (r < 0) {
3001 log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3002 goto ipv4ll_address_fail;
3003 }
3004
3005 r = sd_ipv4ll_new(&link->ipv4ll);
3006 if (r < 0)
3007 return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3008
3009 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3010 if (r < 0)
3011 return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3012 }
3013
3014 ipv4ll_address_fail:
3015
3016 return 0;
3017 }
3018
3019 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3020 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3021 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3022 Link *link;
3023 int r;
3024
3025 assert(m);
3026 assert(m->rtnl);
3027 assert(message);
3028 assert(ret);
3029
3030 r = link_new(m, message, ret);
3031 if (r < 0)
3032 return r;
3033
3034 link = *ret;
3035
3036 log_link_debug(link, "Link %d added", link->ifindex);
3037
3038 r = link_load(link);
3039 if (r < 0)
3040 return r;
3041
3042 if (detect_container() <= 0) {
3043 /* not in a container, udev will be around */
3044 sprintf(ifindex_str, "n%d", link->ifindex);
3045 r = sd_device_new_from_device_id(&device, ifindex_str);
3046 if (r < 0) {
3047 log_link_warning_errno(link, r, "Could not find device: %m");
3048 goto failed;
3049 }
3050
3051 r = sd_device_get_is_initialized(device);
3052 if (r < 0) {
3053 log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3054 goto failed;
3055 }
3056 if (r == 0) {
3057 /* not yet ready */
3058 log_link_debug(link, "link pending udev initialization...");
3059 return 0;
3060 }
3061
3062 r = device_is_renaming(device);
3063 if (r < 0) {
3064 log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3065 goto failed;
3066 }
3067 if (r > 0) {
3068 log_link_debug(link, "Interface is under renaming, pending initialization.");
3069 return 0;
3070 }
3071
3072 r = link_initialized(link, device);
3073 if (r < 0)
3074 goto failed;
3075 } else {
3076 r = link_initialized_and_synced(link);
3077 if (r < 0)
3078 goto failed;
3079 }
3080
3081 return 0;
3082 failed:
3083 link_enter_failed(link);
3084 return r;
3085 }
3086
3087 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3088 int r;
3089
3090 assert(link);
3091
3092 log_link_info(link, "Gained IPv6LL");
3093
3094 link->ipv6ll_address = *address;
3095 link_check_ready(link);
3096
3097 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3098 r = link_acquire_ipv6_conf(link);
3099 if (r < 0) {
3100 link_enter_failed(link);
3101 return r;
3102 }
3103 }
3104
3105 return 0;
3106 }
3107
3108 static int link_carrier_gained(Link *link) {
3109 int r;
3110
3111 assert(link);
3112
3113 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3114 r = link_acquire_conf(link);
3115 if (r < 0) {
3116 link_enter_failed(link);
3117 return r;
3118 }
3119
3120 r = link_request_set_addresses(link);
3121 if (r < 0)
3122 return r;
3123 }
3124
3125 r = link_handle_bound_by_list(link);
3126 if (r < 0)
3127 return r;
3128
3129 return 0;
3130 }
3131
3132 static int link_carrier_lost(Link *link) {
3133 int r;
3134
3135 assert(link);
3136
3137 if (link->network && link->network->ignore_carrier_loss)
3138 return 0;
3139
3140 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3141 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3142 * configuration and stop the clients as well. */
3143 if (link->setting_mtu)
3144 return 0;
3145
3146 r = link_stop_clients(link, false);
3147 if (r < 0) {
3148 link_enter_failed(link);
3149 return r;
3150 }
3151
3152 if (link_dhcp4_server_enabled(link))
3153 (void) sd_dhcp_server_stop(link->dhcp_server);
3154
3155 r = link_drop_config(link);
3156 if (r < 0)
3157 return r;
3158
3159 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3160 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3161 r = link_drop_foreign_config(link);
3162 if (r < 0)
3163 return r;
3164 }
3165
3166 r = link_handle_bound_by_list(link);
3167 if (r < 0)
3168 return r;
3169
3170 return 0;
3171 }
3172
3173 int link_carrier_reset(Link *link) {
3174 int r;
3175
3176 assert(link);
3177
3178 if (link_has_carrier(link)) {
3179 r = link_carrier_lost(link);
3180 if (r < 0)
3181 return r;
3182
3183 r = link_carrier_gained(link);
3184 if (r < 0)
3185 return r;
3186
3187 log_link_info(link, "Reset carrier");
3188 }
3189
3190 return 0;
3191 }
3192
3193 int link_update(Link *link, sd_netlink_message *m) {
3194 struct ether_addr mac;
3195 const char *ifname;
3196 uint32_t mtu;
3197 bool had_carrier, carrier_gained, carrier_lost;
3198 int old_master, r;
3199
3200 assert(link);
3201 assert(link->ifname);
3202 assert(m);
3203
3204 if (link->state == LINK_STATE_LINGER) {
3205 log_link_info(link, "Link re-added");
3206 link_set_state(link, LINK_STATE_CONFIGURING);
3207
3208 r = link_new_carrier_maps(link);
3209 if (r < 0)
3210 return r;
3211 }
3212
3213 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3214 if (r >= 0 && !streq(ifname, link->ifname)) {
3215 Manager *manager = link->manager;
3216
3217 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3218
3219 link_drop(link);
3220 r = link_add(manager, m, &link);
3221 if (r < 0)
3222 return r;
3223 }
3224
3225 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3226 if (r >= 0 && mtu > 0) {
3227 link->mtu = mtu;
3228 if (link->original_mtu == 0) {
3229 link->original_mtu = mtu;
3230 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3231 }
3232
3233 if (link->dhcp_client) {
3234 r = sd_dhcp_client_set_mtu(link->dhcp_client,
3235 link->mtu);
3236 if (r < 0)
3237 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3238 }
3239
3240 if (link->radv) {
3241 r = sd_radv_set_mtu(link->radv, link->mtu);
3242 if (r < 0)
3243 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3244 }
3245 }
3246
3247 /* The kernel may broadcast NEWLINK messages without the MAC address
3248 set, simply ignore them. */
3249 r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3250 if (r >= 0) {
3251 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3252 ETH_ALEN)) {
3253
3254 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3255 ETH_ALEN);
3256
3257 log_link_debug(link, "MAC address: "
3258 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3259 mac.ether_addr_octet[0],
3260 mac.ether_addr_octet[1],
3261 mac.ether_addr_octet[2],
3262 mac.ether_addr_octet[3],
3263 mac.ether_addr_octet[4],
3264 mac.ether_addr_octet[5]);
3265
3266 if (link->ipv4ll) {
3267 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3268 if (r < 0)
3269 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3270 }
3271
3272 if (link->dhcp_client) {
3273 r = sd_dhcp_client_set_mac(link->dhcp_client,
3274 (const uint8_t *) &link->mac,
3275 sizeof (link->mac),
3276 ARPHRD_ETHER);
3277 if (r < 0)
3278 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3279
3280 r = dhcp4_set_client_identifier(link);
3281 if (r < 0)
3282 return r;
3283 }
3284
3285 if (link->dhcp6_client) {
3286 const DUID* duid = link_get_duid(link);
3287
3288 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3289 (const uint8_t *) &link->mac,
3290 sizeof (link->mac),
3291 ARPHRD_ETHER);
3292 if (r < 0)
3293 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3294
3295 if (link->network->iaid_set) {
3296 r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3297 link->network->iaid);
3298 if (r < 0)
3299 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3300 }
3301
3302 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3303 duid->type,
3304 duid->raw_data_len > 0 ? duid->raw_data : NULL,
3305 duid->raw_data_len);
3306 if (r < 0)
3307 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3308 }
3309
3310 if (link->radv) {
3311 r = sd_radv_set_mac(link->radv, &link->mac);
3312 if (r < 0)
3313 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3314 }
3315
3316 if (link->ndisc) {
3317 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3318 if (r < 0)
3319 return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3320 }
3321 }
3322 }
3323
3324 old_master = link->master_ifindex;
3325 (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
3326
3327 had_carrier = link_has_carrier(link);
3328
3329 r = link_update_flags(link, m, old_master != link->master_ifindex);
3330 if (r < 0)
3331 return r;
3332
3333 r = link_update_lldp(link);
3334 if (r < 0)
3335 return r;
3336
3337 carrier_gained = !had_carrier && link_has_carrier(link);
3338 carrier_lost = had_carrier && !link_has_carrier(link);
3339
3340 if (carrier_gained) {
3341 log_link_info(link, "Gained carrier");
3342
3343 r = link_carrier_gained(link);
3344 if (r < 0)
3345 return r;
3346 } else if (carrier_lost) {
3347 log_link_info(link, "Lost carrier");
3348
3349 r = link_carrier_lost(link);
3350 if (r < 0)
3351 return r;
3352 }
3353
3354 return 0;
3355 }
3356
3357 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3358 bool space = false;
3359 Iterator i;
3360 Link *link;
3361
3362 assert(f);
3363 assert(prefix);
3364
3365 if (hashmap_isempty(h))
3366 return;
3367
3368 fputs(prefix, f);
3369 HASHMAP_FOREACH(link, h, i) {
3370 if (space)
3371 fputc(' ', f);
3372
3373 fprintf(f, "%i", link->ifindex);
3374 space = true;
3375 }
3376
3377 fputc('\n', f);
3378 }
3379
3380 int link_save(Link *link) {
3381 _cleanup_free_ char *temp_path = NULL;
3382 _cleanup_fclose_ FILE *f = NULL;
3383 const char *admin_state, *oper_state, *carrier_state, *address_state;
3384 Address *a;
3385 Route *route;
3386 Iterator i;
3387 int r;
3388
3389 assert(link);
3390 assert(link->state_file);
3391 assert(link->lease_file);
3392 assert(link->manager);
3393
3394 if (link->state == LINK_STATE_LINGER) {
3395 (void) unlink(link->state_file);
3396 return 0;
3397 }
3398
3399 link_lldp_save(link);
3400
3401 admin_state = link_state_to_string(link->state);
3402 assert(admin_state);
3403
3404 oper_state = link_operstate_to_string(link->operstate);
3405 assert(oper_state);
3406
3407 carrier_state = link_carrier_state_to_string(link->carrier_state);
3408 assert(carrier_state);
3409
3410 address_state = link_address_state_to_string(link->address_state);
3411 assert(address_state);
3412
3413 r = fopen_temporary(link->state_file, &f, &temp_path);
3414 if (r < 0)
3415 goto fail;
3416
3417 (void) fchmod(fileno(f), 0644);
3418
3419 fprintf(f,
3420 "# This is private data. Do not parse.\n"
3421 "ADMIN_STATE=%s\n"
3422 "OPER_STATE=%s\n"
3423 "CARRIER_STATE=%s\n"
3424 "ADDRESS_STATE=%s\n",
3425 admin_state, oper_state, carrier_state, address_state);
3426
3427 if (link->network) {
3428 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
3429 const char *dhcp_domainname = NULL, *p;
3430 sd_dhcp6_lease *dhcp6_lease = NULL;
3431 unsigned j;
3432 bool space;
3433
3434 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3435 yes_no(link->network->required_for_online));
3436
3437 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
3438 strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
3439
3440 if (link->dhcp6_client) {
3441 r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3442 if (r < 0 && r != -ENOMSG)
3443 log_link_debug(link, "No DHCPv6 lease");
3444 }
3445
3446 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3447
3448 fputs("DNS=", f);
3449 space = false;
3450
3451 for (j = 0; j < link->network->n_dns; j++) {
3452 _cleanup_free_ char *b = NULL;
3453
3454 r = in_addr_to_string(link->network->dns[j].family,
3455 &link->network->dns[j].address, &b);
3456 if (r < 0) {
3457 log_debug_errno(r, "Failed to format address, ignoring: %m");
3458 continue;
3459 }
3460
3461 if (space)
3462 fputc(' ', f);
3463 fputs(b, f);
3464 space = true;
3465 }
3466
3467 if (link->network->dhcp_use_dns &&
3468 link->dhcp_lease) {
3469 const struct in_addr *addresses;
3470
3471 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3472 if (r > 0)
3473 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3474 space = true;
3475 }
3476
3477 if (link->network->dhcp_use_dns && dhcp6_lease) {
3478 struct in6_addr *in6_addrs;
3479
3480 r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3481 if (r > 0) {
3482 if (space)
3483 fputc(' ', f);
3484 serialize_in6_addrs(f, in6_addrs, r);
3485 space = true;
3486 }
3487 }
3488
3489 /* Make sure to flush out old entries before we use the NDISC data */
3490 ndisc_vacuum(link);
3491
3492 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3493 NDiscRDNSS *dd;
3494
3495 SET_FOREACH(dd, link->ndisc_rdnss, i) {
3496 if (space)
3497 fputc(' ', f);
3498
3499 serialize_in6_addrs(f, &dd->address, 1);
3500 space = true;
3501 }
3502 }
3503
3504 fputc('\n', f);
3505
3506 fputs("NTP=", f);
3507 space = false;
3508 fputstrv(f, link->network->ntp, NULL, &space);
3509
3510 if (link->network->dhcp_use_ntp &&
3511 link->dhcp_lease) {
3512 const struct in_addr *addresses;
3513
3514 r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3515 if (r > 0)
3516 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3517 space = true;
3518 }
3519
3520 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3521 struct in6_addr *in6_addrs;
3522 char **hosts;
3523
3524 r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3525 &in6_addrs);
3526 if (r > 0) {
3527 if (space)
3528 fputc(' ', f);
3529 serialize_in6_addrs(f, in6_addrs, r);
3530 space = true;
3531 }
3532
3533 r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3534 if (r > 0)
3535 fputstrv(f, hosts, NULL, &space);
3536 }
3537
3538 fputc('\n', f);
3539
3540 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3541 if (link->dhcp_lease) {
3542 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3543 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3544 }
3545 if (dhcp6_lease)
3546 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3547 }
3548
3549 fputs("DOMAINS=", f);
3550 space = false;
3551 ORDERED_SET_FOREACH(p, link->network->search_domains, i)
3552 fputs_with_space(f, p, NULL, &space);
3553
3554 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3555 NDiscDNSSL *dd;
3556
3557 if (dhcp_domainname)
3558 fputs_with_space(f, dhcp_domainname, NULL, &space);
3559 if (dhcp_domains)
3560 fputstrv(f, dhcp_domains, NULL, &space);
3561 if (dhcp6_domains)
3562 fputstrv(f, dhcp6_domains, NULL, &space);
3563
3564 SET_FOREACH(dd, link->ndisc_dnssl, i)
3565 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3566 }
3567
3568 fputc('\n', f);
3569
3570 fputs("ROUTE_DOMAINS=", f);
3571 space = false;
3572 ORDERED_SET_FOREACH(p, link->network->route_domains, i)
3573 fputs_with_space(f, p, NULL, &space);
3574
3575 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3576 NDiscDNSSL *dd;
3577
3578 if (dhcp_domainname)
3579 fputs_with_space(f, dhcp_domainname, NULL, &space);
3580 if (dhcp_domains)
3581 fputstrv(f, dhcp_domains, NULL, &space);
3582 if (dhcp6_domains)
3583 fputstrv(f, dhcp6_domains, NULL, &space);
3584
3585 SET_FOREACH(dd, link->ndisc_dnssl, i)
3586 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3587 }
3588
3589 fputc('\n', f);
3590
3591 fprintf(f, "LLMNR=%s\n",
3592 resolve_support_to_string(link->network->llmnr));
3593 fprintf(f, "MDNS=%s\n",
3594 resolve_support_to_string(link->network->mdns));
3595 if (link->network->dns_default_route >= 0)
3596 fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
3597
3598 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3599 fprintf(f, "DNS_OVER_TLS=%s\n",
3600 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
3601
3602 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3603 fprintf(f, "DNSSEC=%s\n",
3604 dnssec_mode_to_string(link->network->dnssec_mode));
3605
3606 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3607 const char *n;
3608
3609 fputs("DNSSEC_NTA=", f);
3610 space = false;
3611 SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3612 fputs_with_space(f, n, NULL, &space);
3613 fputc('\n', f);
3614 }
3615
3616 fputs("ADDRESSES=", f);
3617 space = false;
3618 SET_FOREACH(a, link->addresses, i) {
3619 _cleanup_free_ char *address_str = NULL;
3620
3621 r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3622 if (r < 0)
3623 goto fail;
3624
3625 fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3626 space = true;
3627 }
3628 fputc('\n', f);
3629
3630 fputs("ROUTES=", f);
3631 space = false;
3632 SET_FOREACH(route, link->routes, i) {
3633 _cleanup_free_ char *route_str = NULL;
3634
3635 r = in_addr_to_string(route->family, &route->dst, &route_str);
3636 if (r < 0)
3637 goto fail;
3638
3639 fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
3640 space ? " " : "", route_str,
3641 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3642 space = true;
3643 }
3644
3645 fputc('\n', f);
3646 }
3647
3648 print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3649 print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3650
3651 if (link->dhcp_lease) {
3652 struct in_addr address;
3653 const char *tz = NULL;
3654
3655 assert(link->network);
3656
3657 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3658 if (r >= 0)
3659 fprintf(f, "TIMEZONE=%s\n", tz);
3660
3661 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3662 if (r >= 0) {
3663 fputs("DHCP4_ADDRESS=", f);
3664 serialize_in_addrs(f, &address, 1, false, NULL);
3665 fputc('\n', f);
3666 }
3667
3668 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3669 if (r < 0)
3670 goto fail;
3671
3672 fprintf(f,
3673 "DHCP_LEASE=%s\n",
3674 link->lease_file);
3675 } else
3676 (void) unlink(link->lease_file);
3677
3678 if (link->ipv4ll) {
3679 struct in_addr address;
3680
3681 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3682 if (r >= 0) {
3683 fputs("IPV4LL_ADDRESS=", f);
3684 serialize_in_addrs(f, &address, 1, false, NULL);
3685 fputc('\n', f);
3686 }
3687 }
3688
3689 r = fflush_and_check(f);
3690 if (r < 0)
3691 goto fail;
3692
3693 if (rename(temp_path, link->state_file) < 0) {
3694 r = -errno;
3695 goto fail;
3696 }
3697
3698 return 0;
3699
3700 fail:
3701 (void) unlink(link->state_file);
3702 if (temp_path)
3703 (void) unlink(temp_path);
3704
3705 return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3706 }
3707
3708 /* The serialized state in /run is no longer up-to-date. */
3709 void link_dirty(Link *link) {
3710 int r;
3711
3712 assert(link);
3713
3714 /* mark manager dirty as link is dirty */
3715 manager_dirty(link->manager);
3716
3717 r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3718 if (r < 0)
3719 /* allocation errors are ignored */
3720 return;
3721
3722 r = set_put(link->manager->dirty_links, link);
3723 if (r <= 0)
3724 /* don't take another ref if the link was already dirty */
3725 return;
3726
3727 link_ref(link);
3728 }
3729
3730 /* The serialized state in /run is up-to-date */
3731 void link_clean(Link *link) {
3732 assert(link);
3733 assert(link->manager);
3734
3735 link_unref(set_remove(link->manager->dirty_links, link));
3736 }
3737
3738 static const char* const link_state_table[_LINK_STATE_MAX] = {
3739 [LINK_STATE_PENDING] = "pending",
3740 [LINK_STATE_INITIALIZED] = "initialized",
3741 [LINK_STATE_CONFIGURING] = "configuring",
3742 [LINK_STATE_CONFIGURED] = "configured",
3743 [LINK_STATE_UNMANAGED] = "unmanaged",
3744 [LINK_STATE_FAILED] = "failed",
3745 [LINK_STATE_LINGER] = "linger",
3746 };
3747
3748 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
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