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[thirdparty/systemd.git] / src / network / networkd-link.c
1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include <netinet/in.h>
4 #include <linux/if.h>
5 #include <linux/if_arp.h>
6 #include <linux/if_link.h>
7 #include <unistd.h>
8
9 #include "alloc-util.h"
10 #include "batadv.h"
11 #include "bond.h"
12 #include "bridge.h"
13 #include "bus-util.h"
14 #include "device-private.h"
15 #include "device-util.h"
16 #include "dhcp-identifier.h"
17 #include "dhcp-lease-internal.h"
18 #include "env-file.h"
19 #include "ethtool-util.h"
20 #include "fd-util.h"
21 #include "fileio.h"
22 #include "fs-util.h"
23 #include "ipvlan.h"
24 #include "missing_network.h"
25 #include "netlink-util.h"
26 #include "network-internal.h"
27 #include "networkd-address-label.h"
28 #include "networkd-address.h"
29 #include "networkd-can.h"
30 #include "networkd-dhcp-server.h"
31 #include "networkd-dhcp4.h"
32 #include "networkd-dhcp6.h"
33 #include "networkd-fdb.h"
34 #include "networkd-ipv4ll.h"
35 #include "networkd-link-bus.h"
36 #include "networkd-link.h"
37 #include "networkd-lldp-tx.h"
38 #include "networkd-manager.h"
39 #include "networkd-mdb.h"
40 #include "networkd-ndisc.h"
41 #include "networkd-neighbor.h"
42 #include "networkd-nexthop.h"
43 #include "networkd-sriov.h"
44 #include "networkd-sysctl.h"
45 #include "networkd-radv.h"
46 #include "networkd-routing-policy-rule.h"
47 #include "networkd-state-file.h"
48 #include "networkd-wifi.h"
49 #include "set.h"
50 #include "socket-util.h"
51 #include "stat-util.h"
52 #include "stdio-util.h"
53 #include "string-table.h"
54 #include "strv.h"
55 #include "sysctl-util.h"
56 #include "tc.h"
57 #include "tmpfile-util.h"
58 #include "udev-util.h"
59 #include "util.h"
60 #include "vrf.h"
61
62 bool link_ipv4ll_enabled(Link *link) {
63 assert(link);
64
65 if (link->flags & IFF_LOOPBACK)
66 return false;
67
68 if (!link->network)
69 return false;
70
71 if (link->iftype == ARPHRD_CAN)
72 return false;
73
74 if (STRPTR_IN_SET(link->kind,
75 "vrf", "wireguard", "ipip", "gre", "ip6gre","ip6tnl", "sit", "vti",
76 "vti6", "nlmon", "xfrm", "bareudp"))
77 return false;
78
79 /* L3 or L3S mode do not support ARP. */
80 if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S))
81 return false;
82
83 if (link->network->bond)
84 return false;
85
86 return link->network->link_local & ADDRESS_FAMILY_IPV4;
87 }
88
89 bool link_ipv6ll_enabled(Link *link) {
90 assert(link);
91
92 if (!socket_ipv6_is_supported())
93 return false;
94
95 if (link->flags & IFF_LOOPBACK)
96 return false;
97
98 if (!link->network)
99 return false;
100
101 if (link->iftype == ARPHRD_CAN)
102 return false;
103
104 if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "sit", "vti", "nlmon"))
105 return false;
106
107 if (link->network->bond)
108 return false;
109
110 return link->network->link_local & ADDRESS_FAMILY_IPV6;
111 }
112
113 bool link_ipv6_enabled(Link *link) {
114 assert(link);
115
116 if (!socket_ipv6_is_supported())
117 return false;
118
119 if (link->network->bond)
120 return false;
121
122 if (link->iftype == ARPHRD_CAN)
123 return false;
124
125 /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
126 if (link_ipv6ll_enabled(link))
127 return true;
128
129 if (network_has_static_ipv6_configurations(link->network))
130 return true;
131
132 return false;
133 }
134
135 static bool link_is_enslaved(Link *link) {
136 if (link->flags & IFF_SLAVE)
137 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
138 return true;
139
140 if (!link->network)
141 return false;
142
143 if (link->master_ifindex > 0 && link->network->bridge)
144 return true;
145
146 /* TODO: add conditions for other netdevs. */
147
148 return false;
149 }
150
151 static void link_update_master_operstate(Link *link, NetDev *netdev) {
152 Link *master;
153
154 if (!netdev)
155 return;
156
157 if (netdev->ifindex <= 0)
158 return;
159
160 if (link_get(link->manager, netdev->ifindex, &master) < 0)
161 return;
162
163 link_update_operstate(master, true);
164 }
165
166 void link_update_operstate(Link *link, bool also_update_master) {
167 LinkOperationalState operstate;
168 LinkCarrierState carrier_state;
169 LinkAddressState address_state;
170 _cleanup_strv_free_ char **p = NULL;
171 uint8_t scope = RT_SCOPE_NOWHERE;
172 bool changed = false;
173 Address *address;
174
175 assert(link);
176
177 if (link->kernel_operstate == IF_OPER_DORMANT)
178 carrier_state = LINK_CARRIER_STATE_DORMANT;
179 else if (link_has_carrier(link)) {
180 if (link_is_enslaved(link))
181 carrier_state = LINK_CARRIER_STATE_ENSLAVED;
182 else
183 carrier_state = LINK_CARRIER_STATE_CARRIER;
184 } else if (link->flags & IFF_UP)
185 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
186 else
187 carrier_state = LINK_CARRIER_STATE_OFF;
188
189 if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
190 Link *slave;
191
192 SET_FOREACH(slave, link->slaves) {
193 link_update_operstate(slave, false);
194
195 if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
196 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
197 }
198 }
199
200 SET_FOREACH(address, link->addresses) {
201 if (!address_is_ready(address))
202 continue;
203
204 if (address->scope < scope)
205 scope = address->scope;
206 }
207
208 /* for operstate we also take foreign addresses into account */
209 SET_FOREACH(address, link->addresses_foreign) {
210 if (!address_is_ready(address))
211 continue;
212
213 if (address->scope < scope)
214 scope = address->scope;
215 }
216
217 if (scope < RT_SCOPE_SITE)
218 /* universally accessible addresses found */
219 address_state = LINK_ADDRESS_STATE_ROUTABLE;
220 else if (scope < RT_SCOPE_HOST)
221 /* only link or site local addresses found */
222 address_state = LINK_ADDRESS_STATE_DEGRADED;
223 else
224 /* no useful addresses found */
225 address_state = LINK_ADDRESS_STATE_OFF;
226
227 /* Mapping of address and carrier state vs operational state
228 * carrier state
229 * | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
230 * ------------------------------------------------------------------------------
231 * off | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
232 * address_state degraded | off | no-carrier | dormant | degraded-carrier | degraded | enslaved
233 * routable | off | no-carrier | dormant | degraded-carrier | routable | routable
234 */
235
236 if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
237 operstate = (LinkOperationalState) carrier_state;
238 else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
239 operstate = LINK_OPERSTATE_ROUTABLE;
240 else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
241 operstate = LINK_OPERSTATE_DEGRADED;
242 else
243 operstate = LINK_OPERSTATE_ENSLAVED;
244
245 if (link->carrier_state != carrier_state) {
246 link->carrier_state = carrier_state;
247 changed = true;
248 if (strv_extend(&p, "CarrierState") < 0)
249 log_oom();
250 }
251
252 if (link->address_state != address_state) {
253 link->address_state = address_state;
254 changed = true;
255 if (strv_extend(&p, "AddressState") < 0)
256 log_oom();
257 }
258
259 if (link->operstate != operstate) {
260 link->operstate = operstate;
261 changed = true;
262 if (strv_extend(&p, "OperationalState") < 0)
263 log_oom();
264 }
265
266 if (p)
267 link_send_changed_strv(link, p);
268 if (changed)
269 link_dirty(link);
270
271 if (also_update_master && link->network) {
272 link_update_master_operstate(link, link->network->batadv);
273 link_update_master_operstate(link, link->network->bond);
274 link_update_master_operstate(link, link->network->bridge);
275 }
276 }
277
278 #define FLAG_STRING(string, flag, old, new) \
279 (((old ^ new) & flag) \
280 ? ((old & flag) ? (" -" string) : (" +" string)) \
281 : "")
282
283 static int link_update_flags(Link *link, sd_netlink_message *m, bool force_update_operstate) {
284 unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
285 uint8_t operstate;
286 int r;
287
288 assert(link);
289
290 r = sd_rtnl_message_link_get_flags(m, &flags);
291 if (r < 0)
292 return log_link_warning_errno(link, r, "Could not get link flags: %m");
293
294 r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
295 if (r < 0)
296 /* if we got a message without operstate, take it to mean
297 the state was unchanged */
298 operstate = link->kernel_operstate;
299
300 if (!force_update_operstate && (link->flags == flags) && (link->kernel_operstate == operstate))
301 return 0;
302
303 if (link->flags != flags) {
304 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",
305 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
306 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
307 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
308 FLAG_STRING("UP", IFF_UP, link->flags, flags),
309 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
310 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
311 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
312 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
313 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
314 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
315 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
316 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
317 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
318 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
319 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
320 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
321 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
322 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
323 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
324
325 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
326 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
327 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
328 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
329 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
330 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
331 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
332 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
333
334 /* link flags are currently at most 18 bits, let's align to
335 * printing 20 */
336 if (unknown_flags_added)
337 log_link_debug(link,
338 "Unknown link flags gained: %#.5x (ignoring)",
339 unknown_flags_added);
340
341 if (unknown_flags_removed)
342 log_link_debug(link,
343 "Unknown link flags lost: %#.5x (ignoring)",
344 unknown_flags_removed);
345 }
346
347 link->flags = flags;
348 link->kernel_operstate = operstate;
349
350 link_update_operstate(link, true);
351
352 return 0;
353 }
354
355 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
356 _cleanup_(link_unrefp) Link *link = NULL;
357 const char *ifname, *kind = NULL;
358 unsigned short iftype;
359 int r, ifindex;
360 uint16_t type;
361
362 assert(manager);
363 assert(message);
364 assert(ret);
365
366 /* check for link kind */
367 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
368 if (r == 0) {
369 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
370 r = sd_netlink_message_exit_container(message);
371 if (r < 0)
372 return r;
373 }
374
375 r = sd_netlink_message_get_type(message, &type);
376 if (r < 0)
377 return r;
378 else if (type != RTM_NEWLINK)
379 return -EINVAL;
380
381 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
382 if (r < 0)
383 return r;
384 else if (ifindex <= 0)
385 return -EINVAL;
386
387 r = sd_rtnl_message_link_get_type(message, &iftype);
388 if (r < 0)
389 return r;
390
391 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
392 if (r < 0)
393 return r;
394
395 link = new(Link, 1);
396 if (!link)
397 return -ENOMEM;
398
399 *link = (Link) {
400 .n_ref = 1,
401 .manager = manager,
402 .state = LINK_STATE_PENDING,
403 .ifindex = ifindex,
404 .iftype = iftype,
405
406 .n_dns = UINT_MAX,
407 .dns_default_route = -1,
408 .llmnr = _RESOLVE_SUPPORT_INVALID,
409 .mdns = _RESOLVE_SUPPORT_INVALID,
410 .dnssec_mode = _DNSSEC_MODE_INVALID,
411 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
412 };
413
414 link->ifname = strdup(ifname);
415 if (!link->ifname)
416 return -ENOMEM;
417
418 if (kind) {
419 link->kind = strdup(kind);
420 if (!link->kind)
421 return -ENOMEM;
422 }
423
424 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
425 if (r < 0)
426 log_link_debug_errno(link, r, "New device has no master, continuing without");
427
428 r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &link->hw_addr);
429 if (r < 0)
430 log_link_debug_errno(link, r, "Hardware address not found for new device, continuing without");
431
432 r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr);
433 if (r < 0)
434 log_link_debug_errno(link, r, "Broadcast address not found for new device, continuing without");
435
436 r = ethtool_get_permanent_macaddr(&manager->ethtool_fd, link->ifname, &link->permanent_mac);
437 if (r < 0)
438 log_link_debug_errno(link, r, "Permanent MAC address not found for new device, continuing without: %m");
439
440 r = ethtool_get_driver(&manager->ethtool_fd, link->ifname, &link->driver);
441 if (r < 0)
442 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
443
444 r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &link->alternative_names);
445 if (r < 0 && r != -ENODATA)
446 return r;
447
448 if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
449 return -ENOMEM;
450
451 if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
452 return -ENOMEM;
453
454 if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
455 return -ENOMEM;
456
457 r = hashmap_ensure_put(&manager->links, NULL, INT_TO_PTR(link->ifindex), link);
458 if (r < 0)
459 return r;
460
461 r = link_update_flags(link, message, false);
462 if (r < 0)
463 return r;
464
465 *ret = TAKE_PTR(link);
466
467 return 0;
468 }
469
470 void link_ntp_settings_clear(Link *link) {
471 link->ntp = strv_free(link->ntp);
472 }
473
474 void link_dns_settings_clear(Link *link) {
475 if (link->n_dns != UINT_MAX)
476 for (unsigned i = 0; i < link->n_dns; i++)
477 in_addr_full_free(link->dns[i]);
478 link->dns = mfree(link->dns);
479 link->n_dns = UINT_MAX;
480
481 link->search_domains = ordered_set_free_free(link->search_domains);
482 link->route_domains = ordered_set_free_free(link->route_domains);
483
484 link->dns_default_route = -1;
485 link->llmnr = _RESOLVE_SUPPORT_INVALID;
486 link->mdns = _RESOLVE_SUPPORT_INVALID;
487 link->dnssec_mode = _DNSSEC_MODE_INVALID;
488 link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
489
490 link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
491 }
492
493 static void link_free_engines(Link *link) {
494 if (!link)
495 return;
496
497 link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
498 link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client);
499 link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
500 link->dhcp_acd = sd_ipv4acd_unref(link->dhcp_acd);
501
502 link->lldp = sd_lldp_unref(link->lldp);
503 link_lldp_emit_stop(link);
504
505 ndisc_flush(link);
506
507 link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
508 link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
509 link->dhcp6_lease = sd_dhcp6_lease_unref(link->dhcp6_lease);
510 link->ndisc = sd_ndisc_unref(link->ndisc);
511 link->radv = sd_radv_unref(link->radv);
512
513 ipv4_dad_unref(link);
514 }
515
516 static Link *link_free(Link *link) {
517 assert(link);
518
519 link_ntp_settings_clear(link);
520 link_dns_settings_clear(link);
521
522 link->routes = set_free(link->routes);
523 link->routes_foreign = set_free(link->routes_foreign);
524 link->dhcp_routes = set_free(link->dhcp_routes);
525 link->dhcp_routes_old = set_free(link->dhcp_routes_old);
526 link->dhcp6_routes = set_free(link->dhcp6_routes);
527 link->dhcp6_routes_old = set_free(link->dhcp6_routes_old);
528 link->dhcp6_pd_routes = set_free(link->dhcp6_pd_routes);
529 link->dhcp6_pd_routes_old = set_free(link->dhcp6_pd_routes_old);
530 link->ndisc_routes = set_free(link->ndisc_routes);
531
532 link->nexthops = set_free(link->nexthops);
533 link->nexthops_foreign = set_free(link->nexthops_foreign);
534
535 link->neighbors = set_free(link->neighbors);
536 link->neighbors_foreign = set_free(link->neighbors_foreign);
537
538 link->addresses = set_free(link->addresses);
539 link->addresses_foreign = set_free(link->addresses_foreign);
540 link->pool_addresses = set_free(link->pool_addresses);
541 link->static_addresses = set_free(link->static_addresses);
542 link->dhcp6_addresses = set_free(link->dhcp6_addresses);
543 link->dhcp6_addresses_old = set_free(link->dhcp6_addresses_old);
544 link->dhcp6_pd_addresses = set_free(link->dhcp6_pd_addresses);
545 link->dhcp6_pd_addresses_old = set_free(link->dhcp6_pd_addresses_old);
546 link->ndisc_addresses = set_free(link->ndisc_addresses);
547
548 link_free_engines(link);
549
550 free(link->ifname);
551 strv_free(link->alternative_names);
552 free(link->kind);
553 free(link->ssid);
554 free(link->driver);
555
556 unlink_and_free(link->lease_file);
557 unlink_and_free(link->lldp_file);
558 unlink_and_free(link->state_file);
559
560 sd_device_unref(link->sd_device);
561
562 hashmap_free(link->bound_to_links);
563 hashmap_free(link->bound_by_links);
564
565 set_free_with_destructor(link->slaves, link_unref);
566
567 network_unref(link->network);
568
569 return mfree(link);
570 }
571
572 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
573
574 int link_get(Manager *m, int ifindex, Link **ret) {
575 Link *link;
576
577 assert(m);
578 assert(ifindex > 0);
579 assert(ret);
580
581 link = hashmap_get(m->links, INT_TO_PTR(ifindex));
582 if (!link)
583 return -ENODEV;
584
585 *ret = link;
586
587 return 0;
588 }
589
590 void link_set_state(Link *link, LinkState state) {
591 assert(link);
592
593 if (link->state == state)
594 return;
595
596 log_link_debug(link, "State changed: %s -> %s",
597 link_state_to_string(link->state),
598 link_state_to_string(state));
599
600 link->state = state;
601
602 link_send_changed(link, "AdministrativeState", NULL);
603 link_dirty(link);
604 }
605
606 static void link_enter_unmanaged(Link *link) {
607 assert(link);
608
609 link_set_state(link, LINK_STATE_UNMANAGED);
610 }
611
612 int link_stop_engines(Link *link, bool may_keep_dhcp) {
613 int r = 0, k;
614
615 assert(link);
616 assert(link->manager);
617 assert(link->manager->event);
618
619 bool keep_dhcp = may_keep_dhcp &&
620 link->network &&
621 (link->manager->restarting ||
622 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
623
624 if (!keep_dhcp) {
625 k = sd_dhcp_client_stop(link->dhcp_client);
626 if (k < 0)
627 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
628 }
629
630 k = sd_ipv4acd_stop(link->dhcp_acd);
631 if (k < 0)
632 r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client for DHCPv4: %m");
633
634 k = sd_dhcp_server_stop(link->dhcp_server);
635 if (k < 0)
636 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 server: %m");
637
638 k = sd_lldp_stop(link->lldp);
639 if (k < 0)
640 r = log_link_warning_errno(link, k, "Could not stop LLDP: %m");
641
642 k = sd_ipv4ll_stop(link->ipv4ll);
643 if (k < 0)
644 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
645
646 k = ipv4_dad_stop(link);
647 if (k < 0)
648 r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client: %m");
649
650 k = sd_dhcp6_client_stop(link->dhcp6_client);
651 if (k < 0)
652 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
653
654 k = dhcp6_pd_remove(link);
655 if (k < 0)
656 r = log_link_warning_errno(link, k, "Could not remove DHCPv6 PD addresses and routes: %m");
657
658 k = sd_ndisc_stop(link->ndisc);
659 if (k < 0)
660 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
661
662 k = sd_radv_stop(link->radv);
663 if (k < 0)
664 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
665
666 link_lldp_emit_stop(link);
667 return r;
668 }
669
670 void link_enter_failed(Link *link) {
671 assert(link);
672
673 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
674 return;
675
676 log_link_warning(link, "Failed");
677
678 link_set_state(link, LINK_STATE_FAILED);
679
680 (void) link_stop_engines(link, false);
681 }
682
683 static int link_join_netdevs_after_configured(Link *link) {
684 NetDev *netdev;
685 int r;
686
687 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) {
688 if (netdev->ifindex > 0)
689 /* Assume already enslaved. */
690 continue;
691
692 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
693 continue;
694
695 log_struct(LOG_DEBUG,
696 LOG_LINK_INTERFACE(link),
697 LOG_NETDEV_INTERFACE(netdev),
698 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
699
700 r = netdev_join(netdev, link, NULL);
701 if (r < 0)
702 return log_struct_errno(LOG_WARNING, r,
703 LOG_LINK_INTERFACE(link),
704 LOG_NETDEV_INTERFACE(netdev),
705 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
706 }
707
708 return 0;
709 }
710
711 static void link_enter_configured(Link *link) {
712 assert(link);
713 assert(link->network);
714
715 if (link->state != LINK_STATE_CONFIGURING)
716 return;
717
718 link_set_state(link, LINK_STATE_CONFIGURED);
719
720 (void) link_join_netdevs_after_configured(link);
721 }
722
723 void link_check_ready(Link *link) {
724 Address *a;
725
726 assert(link);
727
728 if (link->state == LINK_STATE_CONFIGURED)
729 return;
730
731 if (link->state != LINK_STATE_CONFIGURING)
732 return (void) log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state));
733
734 if (!link->network)
735 return;
736
737 if (!link->addresses_configured)
738 return (void) log_link_debug(link, "%s(): static addresses are not configured.", __func__);
739
740 if (!link->neighbors_configured)
741 return (void) log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
742
743 SET_FOREACH(a, link->addresses)
744 if (!address_is_ready(a)) {
745 _cleanup_free_ char *str = NULL;
746
747 (void) in_addr_prefix_to_string(a->family, &a->in_addr, a->prefixlen, &str);
748 return (void) log_link_debug(link, "%s(): an address %s is not ready.", __func__, strna(str));
749 }
750
751 if (!link->static_routes_configured)
752 return (void) log_link_debug(link, "%s(): static routes are not configured.", __func__);
753
754 if (!link->static_nexthops_configured)
755 return (void) log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
756
757 if (!link->routing_policy_rules_configured)
758 return (void) log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
759
760 if (!link->tc_configured)
761 return (void) log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
762
763 if (!link->sr_iov_configured)
764 return (void) log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
765
766 if (!link->bridge_mdb_configured)
767 return (void) log_link_debug(link, "%s(): Bridge MDB is not configured.", __func__);
768
769 if (link_has_carrier(link) || !link->network->configure_without_carrier) {
770 bool has_ndisc_address = false;
771 NDiscAddress *n;
772
773 if (link_ipv6ll_enabled(link) && !in6_addr_is_set(&link->ipv6ll_address))
774 return (void) log_link_debug(link, "%s(): IPv6LL is not configured yet.", __func__);
775
776 SET_FOREACH(n, link->ndisc_addresses)
777 if (!n->marked) {
778 has_ndisc_address = true;
779 break;
780 }
781
782 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link) || link_ipv4ll_enabled(link)) &&
783 !link->dhcp_address && set_isempty(link->dhcp6_addresses) && !has_ndisc_address &&
784 !link->ipv4ll_address_configured)
785 /* When DHCP[46] or IPv4LL is enabled, at least one address is acquired by them. */
786 return (void) log_link_debug(link, "%s(): DHCP4, DHCP6 or IPv4LL is enabled but no dynamic address is assigned yet.", __func__);
787
788 if (link_dhcp4_enabled(link) || link_dhcp6_enabled(link) || link_dhcp6_pd_is_enabled(link) ||
789 link_ipv6_accept_ra_enabled(link) || link_ipv4ll_enabled(link)) {
790 if (!link->dhcp4_configured &&
791 !(link->dhcp6_address_configured && link->dhcp6_route_configured) &&
792 !(link->dhcp6_pd_address_configured && link->dhcp6_pd_route_configured) &&
793 !(link->ndisc_addresses_configured && link->ndisc_routes_configured) &&
794 !link->ipv4ll_address_configured)
795 /* When DHCP[46], NDisc, or IPv4LL is enabled, at least one protocol must be finished. */
796 return (void) log_link_debug(link, "%s(): dynamic addresses or routes are not configured.", __func__);
797
798 log_link_debug(link, "%s(): dhcp4:%s ipv4ll:%s dhcp6_addresses:%s dhcp_routes:%s dhcp_pd_addresses:%s dhcp_pd_routes:%s ndisc_addresses:%s ndisc_routes:%s",
799 __func__,
800 yes_no(link->dhcp4_configured),
801 yes_no(link->ipv4ll_address_configured),
802 yes_no(link->dhcp6_address_configured),
803 yes_no(link->dhcp6_route_configured),
804 yes_no(link->dhcp6_pd_address_configured),
805 yes_no(link->dhcp6_pd_route_configured),
806 yes_no(link->ndisc_addresses_configured),
807 yes_no(link->ndisc_routes_configured));
808 }
809 }
810
811 link_enter_configured(link);
812 }
813
814 static int link_set_static_configs(Link *link) {
815 int r;
816
817 assert(link);
818 assert(link->network);
819 assert(link->state != _LINK_STATE_INVALID);
820
821 /* Reset all *_configured flags we are configuring. */
822 link->request_static_addresses = false;
823 link->addresses_configured = false;
824 link->addresses_ready = false;
825 link->neighbors_configured = false;
826 link->static_routes_configured = false;
827 link->static_nexthops_configured = false;
828 link->routing_policy_rules_configured = false;
829
830 r = link_set_bridge_fdb(link);
831 if (r < 0)
832 return r;
833
834 r = link_set_bridge_mdb(link);
835 if (r < 0)
836 return r;
837
838 r = link_set_neighbors(link);
839 if (r < 0)
840 return r;
841
842 r = link_set_addresses(link);
843 if (r < 0)
844 return r;
845
846 r = link_set_address_labels(link);
847 if (r < 0)
848 return r;
849
850 /* now that we can figure out a default address for the dhcp server, start it */
851 r = dhcp4_server_configure(link);
852 if (r < 0)
853 return r;
854
855 return 0;
856 }
857
858 static int link_configure_continue(Link *link);
859
860 static int link_mac_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
861 int r;
862
863 assert(link);
864
865 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
866 return 1;
867
868 r = sd_netlink_message_get_errno(m);
869 if (r < 0)
870 log_link_message_warning_errno(link, m, r, "Could not set MAC address, ignoring");
871 else
872 log_link_debug(link, "Setting MAC address done.");
873
874 return 1;
875 }
876
877 static int link_set_mac(Link *link) {
878 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
879 int r;
880
881 assert(link);
882 assert(link->network);
883 assert(link->manager);
884 assert(link->manager->rtnl);
885
886 if (!link->network->mac)
887 return 0;
888
889 log_link_debug(link, "Setting MAC address");
890
891 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
892 if (r < 0)
893 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
894
895 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
896 if (r < 0)
897 return log_link_error_errno(link, r, "Could not set MAC address: %m");
898
899 r = netlink_call_async(link->manager->rtnl, NULL, req, link_mac_handler,
900 link_netlink_destroy_callback, link);
901 if (r < 0)
902 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
903
904 link_ref(link);
905
906 return 0;
907 }
908
909 static int link_nomaster_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
910 int r;
911
912 assert(link);
913
914 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
915 return 1;
916
917 r = sd_netlink_message_get_errno(m);
918 if (r < 0)
919 log_link_message_warning_errno(link, m, r, "Could not set nomaster, ignoring");
920 else
921 log_link_debug(link, "Setting nomaster done.");
922
923 return 1;
924 }
925
926 static int link_set_nomaster(Link *link) {
927 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
928 int r;
929
930 assert(link);
931 assert(link->network);
932 assert(link->manager);
933 assert(link->manager->rtnl);
934
935 /* set it free if not enslaved with networkd */
936 if (link->network->batadv || link->network->bridge || link->network->bond || link->network->vrf)
937 return 0;
938
939 log_link_debug(link, "Setting nomaster");
940
941 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
942 if (r < 0)
943 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
944
945 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
946 if (r < 0)
947 return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
948
949 r = netlink_call_async(link->manager->rtnl, NULL, req, link_nomaster_handler,
950 link_netlink_destroy_callback, link);
951 if (r < 0)
952 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
953
954 link_ref(link);
955
956 return 0;
957 }
958
959 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
960 int r;
961
962 assert(m);
963 assert(link);
964 assert(link->ifname);
965
966 link->setting_mtu = false;
967
968 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
969 return 1;
970
971 r = sd_netlink_message_get_errno(m);
972 if (r < 0)
973 log_link_message_warning_errno(link, m, r, "Could not set MTU, ignoring");
974 else
975 log_link_debug(link, "Setting MTU done.");
976
977 if (link->state == LINK_STATE_INITIALIZED) {
978 r = link_configure_continue(link);
979 if (r < 0)
980 link_enter_failed(link);
981 }
982
983 return 1;
984 }
985
986 int link_set_mtu(Link *link, uint32_t mtu) {
987 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
988 int r;
989
990 assert(link);
991 assert(link->manager);
992 assert(link->manager->rtnl);
993
994 if (mtu == 0 || link->setting_mtu)
995 return 0;
996
997 if (link->mtu == mtu)
998 return 0;
999
1000 log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1001
1002 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1003 if (r < 0)
1004 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1005
1006 /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1007 * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1008 if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1009
1010 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1011 "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes");
1012
1013 mtu = IPV6_MIN_MTU;
1014 }
1015
1016 r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1017 if (r < 0)
1018 return log_link_error_errno(link, r, "Could not append MTU: %m");
1019
1020 r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1021 link_netlink_destroy_callback, link);
1022 if (r < 0)
1023 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1024
1025 link_ref(link);
1026 link->setting_mtu = true;
1027
1028 return 0;
1029 }
1030
1031 static bool link_reduces_vlan_mtu(Link *link) {
1032 /* See netif_reduces_vlan_mtu() in kernel. */
1033 return streq_ptr(link->kind, "macsec");
1034 }
1035
1036 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1037 uint32_t mtu = 0;
1038 NetDev *dev;
1039
1040 HASHMAP_FOREACH(dev, link->network->stacked_netdevs)
1041 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1042 /* See vlan_dev_change_mtu() in kernel. */
1043 mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1044
1045 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1046 /* See macvlan_change_mtu() in kernel. */
1047 mtu = dev->mtu;
1048
1049 return mtu;
1050 }
1051
1052 static int link_configure_mtu(Link *link) {
1053 uint32_t mtu;
1054
1055 assert(link);
1056 assert(link->network);
1057
1058 if (link->network->mtu > 0)
1059 return link_set_mtu(link, link->network->mtu);
1060
1061 mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1062 if (link->mtu >= mtu)
1063 return 0;
1064
1065 log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1066 "If it is not desired, then please explicitly specify MTUBytes= setting.",
1067 link->mtu, mtu);
1068
1069 return link_set_mtu(link, mtu);
1070 }
1071
1072 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1073 int r;
1074
1075 assert(m);
1076 assert(link);
1077 assert(link->ifname);
1078
1079 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1080 return 1;
1081
1082 r = sd_netlink_message_get_errno(m);
1083 if (r < 0)
1084 log_link_message_warning_errno(link, m, r, "Could not set link flags, ignoring");
1085
1086 return 1;
1087 }
1088
1089 static int link_set_flags(Link *link) {
1090 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1091 unsigned ifi_change = 0;
1092 unsigned ifi_flags = 0;
1093 int r;
1094
1095 assert(link);
1096 assert(link->manager);
1097 assert(link->manager->rtnl);
1098
1099 if (link->flags & IFF_LOOPBACK)
1100 return 0;
1101
1102 if (!link->network)
1103 return 0;
1104
1105 if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0 &&
1106 link->network->promiscuous < 0)
1107 return 0;
1108
1109 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1110 if (r < 0)
1111 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1112
1113 if (link->network->arp >= 0) {
1114 ifi_change |= IFF_NOARP;
1115 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1116 }
1117
1118 if (link->network->multicast >= 0) {
1119 ifi_change |= IFF_MULTICAST;
1120 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1121 }
1122
1123 if (link->network->allmulticast >= 0) {
1124 ifi_change |= IFF_ALLMULTI;
1125 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1126 }
1127
1128 if (link->network->promiscuous >= 0) {
1129 ifi_change |= IFF_PROMISC;
1130 SET_FLAG(ifi_flags, IFF_PROMISC, link->network->promiscuous);
1131 }
1132
1133 r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1134 if (r < 0)
1135 return log_link_error_errno(link, r, "Could not set link flags: %m");
1136
1137 r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1138 link_netlink_destroy_callback, link);
1139 if (r < 0)
1140 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1141
1142 link_ref(link);
1143
1144 return 0;
1145 }
1146
1147 static int link_acquire_ipv6_conf(Link *link) {
1148 int r;
1149
1150 assert(link);
1151
1152 if (link->ndisc) {
1153 log_link_debug(link, "Discovering IPv6 routers");
1154
1155 r = sd_ndisc_start(link->ndisc);
1156 if (r < 0 && r != -EBUSY)
1157 return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1158 }
1159
1160 if (link->radv) {
1161 assert(link->radv);
1162 assert(in6_addr_is_link_local(&link->ipv6ll_address));
1163
1164 log_link_debug(link, "Starting IPv6 Router Advertisements");
1165
1166 r = radv_emit_dns(link);
1167 if (r < 0)
1168 return log_link_warning_errno(link, r, "Failed to configure DNS or Domains in IPv6 Router Advertisement: %m");
1169
1170 r = sd_radv_start(link->radv);
1171 if (r < 0 && r != -EBUSY)
1172 return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1173 }
1174
1175 if (link_dhcp6_enabled(link) && IN_SET(link->network->dhcp6_without_ra,
1176 DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST,
1177 DHCP6_CLIENT_START_MODE_SOLICIT)) {
1178 assert(link->dhcp6_client);
1179 assert(in6_addr_is_link_local(&link->ipv6ll_address));
1180
1181 r = dhcp6_request_address(link, link->network->dhcp6_without_ra == DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST);
1182 if (r < 0 && r != -EBUSY)
1183 return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m");
1184 else
1185 log_link_debug(link, "Acquiring DHCPv6 lease");
1186 }
1187
1188 r = dhcp6_request_prefix_delegation(link);
1189 if (r < 0)
1190 return log_link_warning_errno(link, r, "Failed to request DHCPv6 prefix delegation: %m");
1191
1192 return 0;
1193 }
1194
1195 static int link_acquire_ipv4_conf(Link *link) {
1196 int r;
1197
1198 assert(link);
1199 assert(link->manager);
1200 assert(link->manager->event);
1201
1202 if (link->dhcp_client) {
1203 log_link_debug(link, "Acquiring DHCPv4 lease");
1204
1205 r = sd_dhcp_client_start(link->dhcp_client);
1206 if (r < 0)
1207 return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1208
1209 } else if (link->ipv4ll) {
1210 log_link_debug(link, "Acquiring IPv4 link-local address");
1211
1212 r = sd_ipv4ll_start(link->ipv4ll);
1213 if (r < 0)
1214 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1215 }
1216
1217 return 0;
1218 }
1219
1220 static int link_acquire_conf(Link *link) {
1221 int r;
1222
1223 assert(link);
1224
1225 r = link_acquire_ipv4_conf(link);
1226 if (r < 0)
1227 return r;
1228
1229 if (in6_addr_is_set(&link->ipv6ll_address)) {
1230 r = link_acquire_ipv6_conf(link);
1231 if (r < 0)
1232 return r;
1233 }
1234
1235 r = link_lldp_emit_start(link);
1236 if (r < 0)
1237 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1238
1239 return 0;
1240 }
1241
1242 bool link_has_carrier(Link *link) {
1243 /* see Documentation/networking/operstates.txt in the kernel sources */
1244
1245 if (link->kernel_operstate == IF_OPER_UP)
1246 return true;
1247
1248 if (link->kernel_operstate == IF_OPER_UNKNOWN)
1249 /* operstate may not be implemented, so fall back to flags */
1250 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1251 !FLAGS_SET(link->flags, IFF_DORMANT))
1252 return true;
1253
1254 return false;
1255 }
1256
1257 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1258 int r;
1259
1260 assert(link);
1261
1262 link->setting_genmode = false;
1263
1264 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1265 return 1;
1266
1267 r = sd_netlink_message_get_errno(m);
1268 if (r < 0)
1269 log_link_message_warning_errno(link, m, r, "Could not set address genmode for interface, ignoring");
1270 else
1271 log_link_debug(link, "Setting address genmode done.");
1272
1273 if (link->state == LINK_STATE_INITIALIZED) {
1274 r = link_configure_continue(link);
1275 if (r < 0)
1276 link_enter_failed(link);
1277 }
1278
1279 return 1;
1280 }
1281
1282 static int link_configure_addrgen_mode(Link *link) {
1283 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1284 uint8_t ipv6ll_mode;
1285 int r;
1286
1287 assert(link);
1288 assert(link->network);
1289 assert(link->manager);
1290 assert(link->manager->rtnl);
1291
1292 if (!socket_ipv6_is_supported() || link->setting_genmode)
1293 return 0;
1294
1295 log_link_debug(link, "Setting address genmode for link");
1296
1297 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1298 if (r < 0)
1299 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1300
1301 r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1302 if (r < 0)
1303 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1304
1305 r = sd_netlink_message_open_container(req, AF_INET6);
1306 if (r < 0)
1307 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1308
1309 if (!link_ipv6ll_enabled(link))
1310 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1311 else if (link->network->ipv6ll_address_gen_mode < 0) {
1312 r = sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL);
1313 if (r < 0) {
1314 /* The file may not exist. And even if it exists, when stable_secret is unset,
1315 * reading the file fails with EIO. */
1316 log_link_debug_errno(link, r, "Failed to read sysctl property stable_secret: %m");
1317
1318 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1319 } else
1320 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1321 } else
1322 ipv6ll_mode = link->network->ipv6ll_address_gen_mode;
1323
1324 r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1325 if (r < 0)
1326 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1327
1328 r = sd_netlink_message_close_container(req);
1329 if (r < 0)
1330 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1331
1332 r = sd_netlink_message_close_container(req);
1333 if (r < 0)
1334 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1335
1336 r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1337 link_netlink_destroy_callback, link);
1338 if (r < 0)
1339 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1340
1341 link_ref(link);
1342 link->setting_genmode = true;
1343
1344 return 0;
1345 }
1346
1347 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1348 int r;
1349
1350 assert(link);
1351
1352 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1353 return 1;
1354
1355 r = sd_netlink_message_get_errno(m);
1356 if (r < 0)
1357 /* we warn but don't fail the link, as it may be brought up later */
1358 log_link_message_warning_errno(link, m, r, "Could not bring up interface");
1359
1360 return 1;
1361 }
1362
1363 static int link_up(Link *link) {
1364 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1365 int r;
1366
1367 assert(link);
1368 assert(link->network);
1369 assert(link->manager);
1370 assert(link->manager->rtnl);
1371
1372 log_link_debug(link, "Bringing link up");
1373
1374 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1375 if (r < 0)
1376 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1377
1378 r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1379 if (r < 0)
1380 return log_link_error_errno(link, r, "Could not set link flags: %m");
1381
1382 r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1383 link_netlink_destroy_callback, link);
1384 if (r < 0)
1385 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1386
1387 link_ref(link);
1388
1389 return 0;
1390 }
1391
1392 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1393 int r;
1394
1395 assert(link);
1396
1397 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1398 return 1;
1399
1400 r = sd_netlink_message_get_errno(m);
1401 if (r < 0)
1402 log_link_message_warning_errno(link, m, r, "Could not bring down interface");
1403
1404 return 1;
1405 }
1406
1407 int link_down(Link *link, link_netlink_message_handler_t callback) {
1408 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1409 int r;
1410
1411 assert(link);
1412 assert(link->manager);
1413 assert(link->manager->rtnl);
1414
1415 log_link_debug(link, "Bringing link down");
1416
1417 r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1418 RTM_SETLINK, link->ifindex);
1419 if (r < 0)
1420 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1421
1422 r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1423 if (r < 0)
1424 return log_link_error_errno(link, r, "Could not set link flags: %m");
1425
1426 r = netlink_call_async(link->manager->rtnl, NULL, req,
1427 callback ?: link_down_handler,
1428 link_netlink_destroy_callback, link);
1429 if (r < 0)
1430 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1431
1432 link_ref(link);
1433
1434 return 0;
1435 }
1436
1437 static int link_group_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1438 int r;
1439
1440 assert(link);
1441
1442 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1443 return 1;
1444
1445 r = sd_netlink_message_get_errno(m);
1446 if (r < 0)
1447 log_link_message_warning_errno(link, m, r, "Could not set group for the interface");
1448
1449 return 1;
1450 }
1451
1452 static int link_set_group(Link *link) {
1453 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1454 int r;
1455
1456 assert(link);
1457 assert(link->network);
1458 assert(link->manager);
1459 assert(link->manager->rtnl);
1460
1461 if (link->network->group <= 0)
1462 return 0;
1463
1464 log_link_debug(link, "Setting group");
1465
1466 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1467 if (r < 0)
1468 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1469
1470 r = sd_netlink_message_append_u32(req, IFLA_GROUP, link->network->group);
1471 if (r < 0)
1472 return log_link_error_errno(link, r, "Could not set link group: %m");
1473
1474 r = netlink_call_async(link->manager->rtnl, NULL, req, link_group_handler,
1475 link_netlink_destroy_callback, link);
1476 if (r < 0)
1477 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1478
1479 link_ref(link);
1480
1481 return 0;
1482 }
1483
1484 static int link_handle_bound_to_list(Link *link) {
1485 Link *l;
1486 int r;
1487 bool required_up = false;
1488 bool link_is_up = false;
1489
1490 assert(link);
1491
1492 if (hashmap_isempty(link->bound_to_links))
1493 return 0;
1494
1495 if (link->flags & IFF_UP)
1496 link_is_up = true;
1497
1498 HASHMAP_FOREACH (l, link->bound_to_links)
1499 if (link_has_carrier(l)) {
1500 required_up = true;
1501 break;
1502 }
1503
1504 if (!required_up && link_is_up) {
1505 r = link_down(link, NULL);
1506 if (r < 0)
1507 return r;
1508 } else if (required_up && !link_is_up) {
1509 r = link_up(link);
1510 if (r < 0)
1511 return r;
1512 }
1513
1514 return 0;
1515 }
1516
1517 static int link_handle_bound_by_list(Link *link) {
1518 Link *l;
1519 int r;
1520
1521 assert(link);
1522
1523 if (hashmap_isempty(link->bound_by_links))
1524 return 0;
1525
1526 HASHMAP_FOREACH (l, link->bound_by_links) {
1527 r = link_handle_bound_to_list(l);
1528 if (r < 0)
1529 return r;
1530 }
1531
1532 return 0;
1533 }
1534
1535 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1536 int r;
1537
1538 assert(link);
1539 assert(carrier);
1540
1541 if (link == carrier)
1542 return 0;
1543
1544 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1545 return 0;
1546
1547 r = hashmap_ensure_put(h, NULL, INT_TO_PTR(carrier->ifindex), carrier);
1548 if (r < 0)
1549 return r;
1550
1551 link_dirty(link);
1552
1553 return 0;
1554 }
1555
1556 static int link_new_bound_by_list(Link *link) {
1557 Manager *m;
1558 Link *carrier;
1559 int r;
1560
1561 assert(link);
1562 assert(link->manager);
1563
1564 m = link->manager;
1565
1566 HASHMAP_FOREACH(carrier, m->links) {
1567 if (!carrier->network)
1568 continue;
1569
1570 if (strv_isempty(carrier->network->bind_carrier))
1571 continue;
1572
1573 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
1574 r = link_put_carrier(link, carrier, &link->bound_by_links);
1575 if (r < 0)
1576 return r;
1577 }
1578 }
1579
1580 HASHMAP_FOREACH(carrier, link->bound_by_links) {
1581 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1582 if (r < 0)
1583 return r;
1584 }
1585
1586 return 0;
1587 }
1588
1589 static int link_new_bound_to_list(Link *link) {
1590 Manager *m;
1591 Link *carrier;
1592 int r;
1593
1594 assert(link);
1595 assert(link->manager);
1596
1597 if (!link->network)
1598 return 0;
1599
1600 if (strv_isempty(link->network->bind_carrier))
1601 return 0;
1602
1603 m = link->manager;
1604
1605 HASHMAP_FOREACH (carrier, m->links) {
1606 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
1607 r = link_put_carrier(link, carrier, &link->bound_to_links);
1608 if (r < 0)
1609 return r;
1610 }
1611 }
1612
1613 HASHMAP_FOREACH (carrier, link->bound_to_links) {
1614 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
1615 if (r < 0)
1616 return r;
1617 }
1618
1619 return 0;
1620 }
1621
1622 static int link_new_carrier_maps(Link *link) {
1623 int r;
1624
1625 r = link_new_bound_by_list(link);
1626 if (r < 0)
1627 return r;
1628
1629 r = link_handle_bound_by_list(link);
1630 if (r < 0)
1631 return r;
1632
1633 r = link_new_bound_to_list(link);
1634 if (r < 0)
1635 return r;
1636
1637 r = link_handle_bound_to_list(link);
1638 if (r < 0)
1639 return r;
1640
1641 return 0;
1642 }
1643
1644 static void link_free_bound_to_list(Link *link) {
1645 bool updated = false;
1646 Link *bound_to;
1647
1648 assert(link);
1649
1650 while ((bound_to = hashmap_steal_first(link->bound_to_links))) {
1651 updated = true;
1652
1653 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
1654 link_dirty(bound_to);
1655 }
1656
1657 if (updated)
1658 link_dirty(link);
1659
1660 return;
1661 }
1662
1663 static void link_free_bound_by_list(Link *link) {
1664 bool updated = false;
1665 Link *bound_by;
1666
1667 assert(link);
1668
1669 while ((bound_by = hashmap_steal_first(link->bound_by_links))) {
1670 updated = true;
1671
1672 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
1673 link_dirty(bound_by);
1674 link_handle_bound_to_list(bound_by);
1675 }
1676 }
1677
1678 if (updated)
1679 link_dirty(link);
1680
1681 return;
1682 }
1683
1684 static void link_free_carrier_maps(Link *link) {
1685 assert(link);
1686
1687 link_free_bound_to_list(link);
1688 link_free_bound_by_list(link);
1689
1690 return;
1691 }
1692
1693 static int link_append_to_master(Link *link, NetDev *netdev) {
1694 Link *master;
1695 int r;
1696
1697 assert(link);
1698 assert(netdev);
1699
1700 r = link_get(link->manager, netdev->ifindex, &master);
1701 if (r < 0)
1702 return r;
1703
1704 r = set_ensure_put(&master->slaves, NULL, link);
1705 if (r <= 0)
1706 return r;
1707
1708 link_ref(link);
1709 return 0;
1710 }
1711
1712 static void link_drop_from_master(Link *link, NetDev *netdev) {
1713 Link *master;
1714
1715 assert(link);
1716
1717 if (!link->manager || !netdev)
1718 return;
1719
1720 if (link_get(link->manager, netdev->ifindex, &master) < 0)
1721 return;
1722
1723 link_unref(set_remove(master->slaves, link));
1724 }
1725
1726 static void link_detach_from_manager(Link *link) {
1727 if (!link || !link->manager)
1728 return;
1729
1730 link_unref(set_remove(link->manager->links_requesting_uuid, link));
1731 link_clean(link);
1732
1733 /* The following must be called at last. */
1734 assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
1735 link_unref(link);
1736 }
1737
1738 static void link_drop(Link *link) {
1739 if (!link || link->state == LINK_STATE_LINGER)
1740 return;
1741
1742 link_set_state(link, LINK_STATE_LINGER);
1743
1744 link_free_carrier_maps(link);
1745
1746 if (link->network) {
1747 link_drop_from_master(link, link->network->batadv);
1748 link_drop_from_master(link, link->network->bridge);
1749 link_drop_from_master(link, link->network->bond);
1750 }
1751
1752 log_link_debug(link, "Link removed");
1753
1754 (void) unlink(link->state_file);
1755 link_detach_from_manager(link);
1756 }
1757
1758 static int link_joined(Link *link) {
1759 int r;
1760
1761 assert(link);
1762 assert(link->network);
1763
1764 switch (link->network->activation_policy) {
1765 case ACTIVATION_POLICY_BOUND:
1766 r = link_handle_bound_to_list(link);
1767 if (r < 0)
1768 return r;
1769 break;
1770 case ACTIVATION_POLICY_UP:
1771 if (link->activated)
1772 break;
1773 _fallthrough_;
1774 case ACTIVATION_POLICY_ALWAYS_UP:
1775 r = link_up(link);
1776 if (r < 0) {
1777 link_enter_failed(link);
1778 return r;
1779 }
1780 break;
1781 case ACTIVATION_POLICY_DOWN:
1782 if (link->activated)
1783 break;
1784 _fallthrough_;
1785 case ACTIVATION_POLICY_ALWAYS_DOWN:
1786 r = link_down(link, NULL);
1787 if (r < 0) {
1788 link_enter_failed(link);
1789 return r;
1790 }
1791 break;
1792 default:
1793 break;
1794 }
1795 link->activated = true;
1796
1797 if (link->network->bridge) {
1798 r = link_set_bridge(link);
1799 if (r < 0)
1800 log_link_error_errno(link, r, "Could not set bridge message: %m");
1801
1802 r = link_append_to_master(link, link->network->bridge);
1803 if (r < 0)
1804 log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
1805 }
1806
1807 if (link->network->bond) {
1808 r = link_set_bond(link);
1809 if (r < 0)
1810 log_link_error_errno(link, r, "Could not set bond message: %m");
1811
1812 r = link_append_to_master(link, link->network->bond);
1813 if (r < 0)
1814 log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
1815 }
1816
1817 r = link_set_bridge_vlan(link);
1818 if (r < 0)
1819 log_link_error_errno(link, r, "Could not set bridge vlan: %m");
1820
1821 /* Skip setting up addresses until it gets carrier,
1822 or it would try to set addresses twice,
1823 which is bad for non-idempotent steps. */
1824 if (!link_has_carrier(link) && !link->network->configure_without_carrier)
1825 return 0;
1826
1827 link_set_state(link, LINK_STATE_CONFIGURING);
1828
1829 r = link_acquire_conf(link);
1830 if (r < 0)
1831 return r;
1832
1833 return link_set_static_configs(link);
1834 }
1835
1836 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1837 int r;
1838
1839 assert(link);
1840 assert(link->network);
1841 assert(link->enslaving > 0);
1842
1843 link->enslaving--;
1844
1845 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1846 return 1;
1847
1848 r = sd_netlink_message_get_errno(m);
1849 if (r < 0 && r != -EEXIST) {
1850 log_link_message_warning_errno(link, m, r, "Could not join netdev");
1851 link_enter_failed(link);
1852 return 1;
1853 }
1854
1855 log_link_debug(link, "Joined netdev");
1856
1857 if (link->enslaving == 0) {
1858 r = link_joined(link);
1859 if (r < 0)
1860 link_enter_failed(link);
1861 }
1862
1863 return 1;
1864 }
1865
1866 static int link_enter_join_netdev(Link *link) {
1867 NetDev *netdev;
1868 int r;
1869
1870 assert(link);
1871 assert(link->network);
1872 assert(link->state == LINK_STATE_INITIALIZED);
1873
1874 link_set_state(link, LINK_STATE_CONFIGURING);
1875
1876 link->enslaving = 0;
1877
1878 if (link->network->bond) {
1879 if (link->network->bond->state == NETDEV_STATE_READY &&
1880 link->network->bond->ifindex == link->master_ifindex)
1881 return link_joined(link);
1882
1883 log_struct(LOG_DEBUG,
1884 LOG_LINK_INTERFACE(link),
1885 LOG_NETDEV_INTERFACE(link->network->bond),
1886 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
1887
1888 link->enslaving++;
1889
1890 r = netdev_join(link->network->bond, link, netdev_join_handler);
1891 if (r < 0) {
1892 log_struct_errno(LOG_WARNING, r,
1893 LOG_LINK_INTERFACE(link),
1894 LOG_NETDEV_INTERFACE(link->network->bond),
1895 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
1896 link_enter_failed(link);
1897 return r;
1898 }
1899 }
1900
1901 if (link->network->batadv) {
1902 log_struct(LOG_DEBUG,
1903 LOG_LINK_INTERFACE(link),
1904 LOG_NETDEV_INTERFACE(link->network->batadv),
1905 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->batadv->ifname));
1906
1907 link->enslaving++;
1908
1909 r = netdev_join(link->network->batadv, link, netdev_join_handler);
1910 if (r < 0) {
1911 log_struct_errno(LOG_WARNING, r,
1912 LOG_LINK_INTERFACE(link),
1913 LOG_NETDEV_INTERFACE(link->network->batadv),
1914 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->batadv->ifname));
1915 link_enter_failed(link);
1916 return r;
1917 }
1918 }
1919
1920 if (link->network->bridge) {
1921 log_struct(LOG_DEBUG,
1922 LOG_LINK_INTERFACE(link),
1923 LOG_NETDEV_INTERFACE(link->network->bridge),
1924 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
1925
1926 link->enslaving++;
1927
1928 r = netdev_join(link->network->bridge, link, netdev_join_handler);
1929 if (r < 0) {
1930 log_struct_errno(LOG_WARNING, r,
1931 LOG_LINK_INTERFACE(link),
1932 LOG_NETDEV_INTERFACE(link->network->bridge),
1933 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
1934 link_enter_failed(link);
1935 return r;
1936 }
1937 }
1938
1939 if (link->network->vrf) {
1940 log_struct(LOG_DEBUG,
1941 LOG_LINK_INTERFACE(link),
1942 LOG_NETDEV_INTERFACE(link->network->vrf),
1943 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
1944
1945 link->enslaving++;
1946
1947 r = netdev_join(link->network->vrf, link, netdev_join_handler);
1948 if (r < 0) {
1949 log_struct_errno(LOG_WARNING, r,
1950 LOG_LINK_INTERFACE(link),
1951 LOG_NETDEV_INTERFACE(link->network->vrf),
1952 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
1953 link_enter_failed(link);
1954 return r;
1955 }
1956 }
1957
1958 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) {
1959
1960 if (netdev->ifindex > 0)
1961 /* Assume already enslaved. */
1962 continue;
1963
1964 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
1965 continue;
1966
1967 log_struct(LOG_DEBUG,
1968 LOG_LINK_INTERFACE(link),
1969 LOG_NETDEV_INTERFACE(netdev),
1970 LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
1971
1972 link->enslaving++;
1973
1974 r = netdev_join(netdev, link, netdev_join_handler);
1975 if (r < 0) {
1976 log_struct_errno(LOG_WARNING, r,
1977 LOG_LINK_INTERFACE(link),
1978 LOG_NETDEV_INTERFACE(netdev),
1979 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
1980 link_enter_failed(link);
1981 return r;
1982 }
1983 }
1984
1985 if (link->enslaving == 0)
1986 return link_joined(link);
1987
1988 return 0;
1989 }
1990
1991 static int link_drop_foreign_config(Link *link) {
1992 int k, r;
1993
1994 assert(link);
1995 assert(link->manager);
1996
1997 r = link_drop_foreign_addresses(link);
1998
1999 k = link_drop_foreign_neighbors(link);
2000 if (k < 0 && r >= 0)
2001 r = k;
2002
2003 k = link_drop_foreign_routes(link);
2004 if (k < 0 && r >= 0)
2005 r = k;
2006
2007 k = link_drop_foreign_nexthops(link);
2008 if (k < 0 && r >= 0)
2009 r = k;
2010
2011 k = manager_drop_foreign_routing_policy_rules(link->manager);
2012 if (k < 0 && r >= 0)
2013 r = k;
2014
2015 return r;
2016 }
2017
2018 static int link_drop_config(Link *link) {
2019 int k, r;
2020
2021 assert(link);
2022 assert(link->manager);
2023
2024 r = link_drop_addresses(link);
2025
2026 k = link_drop_neighbors(link);
2027 if (k < 0 && r >= 0)
2028 r = k;
2029
2030 k = link_drop_routes(link);
2031 if (k < 0 && r >= 0)
2032 r = k;
2033
2034 k = link_drop_nexthops(link);
2035 if (k < 0 && r >= 0)
2036 r = k;
2037
2038 k = manager_drop_routing_policy_rules(link->manager, link);
2039 if (k < 0 && r >= 0)
2040 r = k;
2041
2042 ndisc_flush(link);
2043
2044 return r;
2045 }
2046
2047 int link_configure(Link *link) {
2048 int r;
2049
2050 assert(link);
2051 assert(link->network);
2052 assert(link->state == LINK_STATE_INITIALIZED);
2053
2054 r = link_configure_traffic_control(link);
2055 if (r < 0)
2056 return r;
2057
2058 r = link_configure_sr_iov(link);
2059 if (r < 0)
2060 return r;
2061
2062 if (link->iftype == ARPHRD_CAN)
2063 return link_configure_can(link);
2064
2065 r = link_set_sysctl(link);
2066 if (r < 0)
2067 return r;
2068
2069 r = link_set_mac(link);
2070 if (r < 0)
2071 return r;
2072
2073 r = link_set_nomaster(link);
2074 if (r < 0)
2075 return r;
2076
2077 r = link_set_flags(link);
2078 if (r < 0)
2079 return r;
2080
2081 r = link_set_group(link);
2082 if (r < 0)
2083 return r;
2084
2085 r = ipv4ll_configure(link);
2086 if (r < 0)
2087 return r;
2088
2089 r = dhcp4_configure(link);
2090 if (r < 0)
2091 return r;
2092
2093 r = dhcp6_configure(link);
2094 if (r < 0)
2095 return r;
2096
2097 r = ndisc_configure(link);
2098 if (r < 0)
2099 return r;
2100
2101 r = radv_configure(link);
2102 if (r < 0)
2103 return r;
2104
2105 r = link_lldp_rx_configure(link);
2106 if (r < 0)
2107 return r;
2108
2109 r = link_configure_mtu(link);
2110 if (r < 0)
2111 return r;
2112
2113 r = link_configure_addrgen_mode(link);
2114 if (r < 0)
2115 return r;
2116
2117 return link_configure_continue(link);
2118 }
2119
2120 /* The configuration continues in this separate function, instead of
2121 * including this in the above link_configure() function, for two
2122 * reasons:
2123 * 1) some devices reset the link when the mtu is set, which caused
2124 * an infinite loop here in networkd; see:
2125 * https://github.com/systemd/systemd/issues/6593
2126 * https://github.com/systemd/systemd/issues/9831
2127 * 2) if ipv6ll is disabled, then bringing the interface up must be
2128 * delayed until after we get confirmation from the kernel that
2129 * the addr_gen_mode parameter has been set (via netlink), see:
2130 * https://github.com/systemd/systemd/issues/13882
2131 */
2132 static int link_configure_continue(Link *link) {
2133 int r;
2134
2135 assert(link);
2136 assert(link->network);
2137 assert(link->state == LINK_STATE_INITIALIZED);
2138
2139 if (link->setting_mtu || link->setting_genmode)
2140 return 0;
2141
2142 /* Drop foreign config, but ignore loopback or critical devices.
2143 * We do not want to remove loopback address or addresses used for root NFS. */
2144 if (!(link->flags & IFF_LOOPBACK) &&
2145 link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
2146 r = link_drop_foreign_config(link);
2147 if (r < 0)
2148 return r;
2149 }
2150
2151 /* The kernel resets ipv6 mtu after changing device mtu;
2152 * we must set this here, after we've set device mtu */
2153 r = link_set_ipv6_mtu(link);
2154 if (r < 0)
2155 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface, ignoring: %m");
2156
2157 return link_enter_join_netdev(link);
2158 }
2159
2160 static int link_reconfigure_internal(Link *link, sd_netlink_message *m, bool force) {
2161 _cleanup_strv_free_ char **s = NULL;
2162 Network *network;
2163 int r;
2164
2165 assert(m);
2166
2167 r = sd_netlink_message_get_errno(m);
2168 if (r < 0)
2169 return r;
2170
2171 r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
2172 if (r < 0 && r != -ENODATA)
2173 return r;
2174
2175 strv_free_and_replace(link->alternative_names, s);
2176
2177 r = network_get(link->manager, link->iftype, link->sd_device,
2178 link->ifname, link->alternative_names, link->driver,
2179 &link->hw_addr.addr.ether, &link->permanent_mac,
2180 link->wlan_iftype, link->ssid, &link->bssid, &network);
2181 if (r == -ENOENT) {
2182 link_enter_unmanaged(link);
2183 return 0;
2184 } else if (r == 0 && network->unmanaged) {
2185 link_enter_unmanaged(link);
2186 return 0;
2187 } else if (r < 0)
2188 return r;
2189
2190 if (link->network == network && !force)
2191 return 0;
2192
2193 log_link_info(link, "Re-configuring with %s", network->filename);
2194
2195 /* Dropping old .network file */
2196 r = link_stop_engines(link, false);
2197 if (r < 0)
2198 return r;
2199
2200 r = link_drop_config(link);
2201 if (r < 0)
2202 return r;
2203
2204 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
2205 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
2206 r = link_drop_foreign_config(link);
2207 if (r < 0)
2208 return r;
2209 }
2210
2211 link_free_carrier_maps(link);
2212 link_free_engines(link);
2213 link->network = network_unref(link->network);
2214 link_unref(set_remove(link->manager->links_requesting_uuid, link));
2215
2216 /* Then, apply new .network file */
2217 link->network = network_ref(network);
2218 link_dirty(link);
2219
2220 r = link_new_carrier_maps(link);
2221 if (r < 0)
2222 return r;
2223
2224 link_set_state(link, LINK_STATE_INITIALIZED);
2225 link->activated = false;
2226
2227 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
2228 * link_configure() is called later asynchronously. */
2229 r = link_configure_duid(link);
2230 if (r <= 0)
2231 return r;
2232
2233 r = link_configure(link);
2234 if (r < 0)
2235 return r;
2236
2237 return 0;
2238 }
2239
2240 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2241 int r;
2242
2243 r = link_reconfigure_internal(link, m, false);
2244 if (r < 0)
2245 link_enter_failed(link);
2246
2247 return 1;
2248 }
2249
2250 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2251 int r;
2252
2253 r = link_reconfigure_internal(link, m, true);
2254 if (r < 0)
2255 link_enter_failed(link);
2256
2257 return 1;
2258 }
2259
2260 int link_reconfigure(Link *link, bool force) {
2261 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2262 int r;
2263
2264 /* When link in pending or initialized state, then link_configure() will be called. To prevent
2265 * the function from being called multiple times simultaneously, refuse to reconfigure the
2266 * interface in these cases. */
2267 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
2268 return 0; /* 0 means no-op. */
2269
2270 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2271 link->ifindex);
2272 if (r < 0)
2273 return r;
2274
2275 r = netlink_call_async(link->manager->rtnl, NULL, req,
2276 force ? link_force_reconfigure_handler : link_reconfigure_handler,
2277 link_netlink_destroy_callback, link);
2278 if (r < 0)
2279 return r;
2280
2281 link_ref(link);
2282
2283 return 1; /* 1 means the interface will be reconfigured. */
2284 }
2285
2286 static int link_initialized_and_synced(Link *link) {
2287 Network *network;
2288 int r;
2289
2290 assert(link);
2291 assert(link->ifname);
2292 assert(link->manager);
2293
2294 /* We may get called either from the asynchronous netlink callback,
2295 * or directly for link_add() if running in a container. See link_add(). */
2296 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
2297 return 0;
2298
2299 log_link_debug(link, "Link state is up-to-date");
2300 link_set_state(link, LINK_STATE_INITIALIZED);
2301
2302 r = link_new_bound_by_list(link);
2303 if (r < 0)
2304 return r;
2305
2306 r = link_handle_bound_by_list(link);
2307 if (r < 0)
2308 return r;
2309
2310 if (!link->network) {
2311 r = wifi_get_info(link);
2312 if (r < 0)
2313 return r;
2314
2315 r = network_get(link->manager, link->iftype, link->sd_device,
2316 link->ifname, link->alternative_names, link->driver,
2317 &link->hw_addr.addr.ether, &link->permanent_mac,
2318 link->wlan_iftype, link->ssid, &link->bssid, &network);
2319 if (r == -ENOENT) {
2320 link_enter_unmanaged(link);
2321 return 0;
2322 } else if (r == 0 && network->unmanaged) {
2323 link_enter_unmanaged(link);
2324 return 0;
2325 } else if (r < 0)
2326 return r;
2327
2328 if (link->flags & IFF_LOOPBACK) {
2329 if (network->link_local != ADDRESS_FAMILY_NO)
2330 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2331
2332 if (network->dhcp != ADDRESS_FAMILY_NO)
2333 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2334
2335 if (network->dhcp_server)
2336 log_link_debug(link, "Ignoring DHCP server for loopback link");
2337 }
2338
2339 link->network = network_ref(network);
2340 link_dirty(link);
2341 }
2342
2343 r = link_new_bound_to_list(link);
2344 if (r < 0)
2345 return r;
2346
2347 /* link_configure_duid() returns 0 if it requests product UUID. In that case,
2348 * link_configure() is called later asynchronously. */
2349 r = link_configure_duid(link);
2350 if (r <= 0)
2351 return r;
2352
2353 r = link_configure(link);
2354 if (r < 0)
2355 return r;
2356
2357 return 0;
2358 }
2359
2360 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2361 _cleanup_strv_free_ char **s = NULL;
2362 int r;
2363
2364 r = sd_netlink_message_get_errno(m);
2365 if (r < 0) {
2366 log_link_warning_errno(link, r, "Failed to wait for the interface to be initialized: %m");
2367 link_enter_failed(link);
2368 return 0;
2369 }
2370
2371 r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
2372 if (r < 0 && r != -ENODATA) {
2373 link_enter_failed(link);
2374 return 0;
2375 }
2376
2377 strv_free_and_replace(link->alternative_names, s);
2378
2379 r = link_initialized_and_synced(link);
2380 if (r < 0)
2381 link_enter_failed(link);
2382 return 1;
2383 }
2384
2385 static int link_initialized(Link *link, sd_device *device) {
2386 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2387 int r;
2388
2389 assert(link);
2390 assert(link->manager);
2391 assert(link->manager->rtnl);
2392 assert(device);
2393
2394 if (link->state != LINK_STATE_PENDING)
2395 return 0;
2396
2397 if (link->sd_device)
2398 return 0;
2399
2400 log_link_debug(link, "udev initialized link");
2401 link_set_state(link, LINK_STATE_INITIALIZED);
2402
2403 link->sd_device = sd_device_ref(device);
2404
2405 /* udev has initialized the link, but we don't know if we have yet
2406 * processed the NEWLINK messages with the latest state. Do a GETLINK,
2407 * when it returns we know that the pending NEWLINKs have already been
2408 * processed and that we are up-to-date */
2409
2410 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
2411 link->ifindex);
2412 if (r < 0)
2413 return r;
2414
2415 r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
2416 link_netlink_destroy_callback, link);
2417 if (r < 0)
2418 return r;
2419
2420 link_ref(link);
2421
2422 return 0;
2423 }
2424
2425 static int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
2426 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
2427 char ifindex_str[2 + DECIMAL_STR_MAX(int)];
2428 Link *link;
2429 int r;
2430
2431 assert(m);
2432 assert(m->rtnl);
2433 assert(message);
2434 assert(ret);
2435
2436 r = link_new(m, message, ret);
2437 if (r < 0)
2438 return r;
2439
2440 link = *ret;
2441
2442 log_link_debug(link, "Link %d added", link->ifindex);
2443
2444 if (path_is_read_only_fs("/sys") <= 0) {
2445 /* udev should be around */
2446 sprintf(ifindex_str, "n%d", link->ifindex);
2447 r = sd_device_new_from_device_id(&device, ifindex_str);
2448 if (r < 0) {
2449 log_link_warning_errno(link, r, "Could not find device, waiting for device initialization: %m");
2450 return 0;
2451 }
2452
2453 r = sd_device_get_is_initialized(device);
2454 if (r < 0) {
2455 log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
2456 goto failed;
2457 }
2458 if (r == 0) {
2459 /* not yet ready */
2460 log_link_debug(link, "link pending udev initialization...");
2461 return 0;
2462 }
2463
2464 r = device_is_renaming(device);
2465 if (r < 0) {
2466 log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
2467 goto failed;
2468 }
2469 if (r > 0) {
2470 log_link_debug(link, "Interface is being renamed, pending initialization.");
2471 return 0;
2472 }
2473
2474 r = link_initialized(link, device);
2475 if (r < 0)
2476 goto failed;
2477 } else {
2478 r = link_initialized_and_synced(link);
2479 if (r < 0)
2480 goto failed;
2481 }
2482
2483 return 0;
2484 failed:
2485 link_enter_failed(link);
2486 return r;
2487 }
2488
2489 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
2490 int r;
2491
2492 assert(link);
2493
2494 log_link_info(link, "Gained IPv6LL");
2495
2496 link->ipv6ll_address = *address;
2497 link_check_ready(link);
2498
2499 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
2500 r = link_acquire_ipv6_conf(link);
2501 if (r < 0) {
2502 link_enter_failed(link);
2503 return r;
2504 }
2505 }
2506
2507 return 0;
2508 }
2509
2510 int manager_udev_process_link(sd_device_monitor *monitor, sd_device *device, void *userdata) {
2511 sd_device_action_t action;
2512 Manager *m = userdata;
2513 Link *link = NULL;
2514 int r, ifindex;
2515
2516 assert(m);
2517 assert(device);
2518
2519 r = sd_device_get_action(device, &action);
2520 if (r < 0) {
2521 log_device_debug_errno(device, r, "Failed to get udev action, ignoring device: %m");
2522 return 0;
2523 }
2524
2525 /* Ignore the "remove" uevent — let's remove a device only if rtnetlink says so. All other uevents
2526 * are "positive" events in some form, i.e. inform us about a changed or new network interface, that
2527 * still exists — and we are interested in that. */
2528 if (action == SD_DEVICE_REMOVE)
2529 return 0;
2530
2531 r = sd_device_get_ifindex(device, &ifindex);
2532 if (r < 0) {
2533 log_device_debug_errno(device, r, "Ignoring udev %s event for device without ifindex or with invalid ifindex: %m",
2534 device_action_to_string(action));
2535 return 0;
2536 }
2537
2538 r = device_is_renaming(device);
2539 if (r < 0) {
2540 log_device_error_errno(device, r, "Failed to determine the device is renamed or not, ignoring '%s' uevent: %m",
2541 device_action_to_string(action));
2542 return 0;
2543 }
2544 if (r > 0) {
2545 log_device_debug(device, "Interface is under renaming, wait for the interface to be renamed.");
2546 return 0;
2547 }
2548
2549 r = link_get(m, ifindex, &link);
2550 if (r < 0) {
2551 if (r != -ENODEV)
2552 log_debug_errno(r, "Failed to get link from ifindex %i, ignoring: %m", ifindex);
2553 return 0;
2554 }
2555
2556 (void) link_initialized(link, device);
2557
2558 return 0;
2559 }
2560
2561 static int link_carrier_gained(Link *link) {
2562 int r;
2563
2564 assert(link);
2565
2566 r = wifi_get_info(link);
2567 if (r < 0)
2568 return r;
2569 if (r > 0) {
2570 r = link_reconfigure(link, false);
2571 if (r < 0) {
2572 link_enter_failed(link);
2573 return r;
2574 }
2575 }
2576
2577 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
2578 r = link_acquire_conf(link);
2579 if (r < 0) {
2580 link_enter_failed(link);
2581 return r;
2582 }
2583
2584 link_set_state(link, LINK_STATE_CONFIGURING);
2585 r = link_set_static_configs(link);
2586 if (r < 0)
2587 return r;
2588 }
2589
2590 r = link_handle_bound_by_list(link);
2591 if (r < 0)
2592 return r;
2593
2594 if (!link->bridge_mdb_configured) {
2595 r = link_set_bridge_mdb(link);
2596 if (r < 0)
2597 return r;
2598 }
2599
2600 if (streq_ptr(link->kind, "bridge")) {
2601 Link *slave;
2602
2603 SET_FOREACH(slave, link->slaves) {
2604 if (slave->bridge_mdb_configured)
2605 continue;
2606
2607 r = link_set_bridge_mdb(slave);
2608 if (r < 0)
2609 link_enter_failed(slave);
2610 }
2611 }
2612
2613 return 0;
2614 }
2615
2616 static int link_carrier_lost(Link *link) {
2617 int r;
2618
2619 assert(link);
2620
2621 if (link->network && link->network->ignore_carrier_loss)
2622 return 0;
2623
2624 /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
2625 * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
2626 * configuration and stop the clients as well. */
2627 if (link->setting_mtu)
2628 return 0;
2629
2630 r = link_stop_engines(link, false);
2631 if (r < 0) {
2632 link_enter_failed(link);
2633 return r;
2634 }
2635
2636 r = link_drop_config(link);
2637 if (r < 0)
2638 return r;
2639
2640 if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
2641 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
2642 r = link_drop_foreign_config(link);
2643 if (r < 0)
2644 return r;
2645 }
2646
2647 r = link_handle_bound_by_list(link);
2648 if (r < 0)
2649 return r;
2650
2651 return 0;
2652 }
2653
2654 int link_carrier_reset(Link *link) {
2655 int r;
2656
2657 assert(link);
2658
2659 if (link_has_carrier(link)) {
2660 r = link_carrier_lost(link);
2661 if (r < 0)
2662 return r;
2663
2664 r = link_carrier_gained(link);
2665 if (r < 0)
2666 return r;
2667
2668 log_link_info(link, "Reset carrier");
2669 }
2670
2671 return 0;
2672 }
2673
2674 static int link_admin_state_up(Link *link) {
2675 int r;
2676
2677 assert(link);
2678
2679 /* This is called every time an interface admin state changes to up;
2680 * specifically, when IFF_UP flag changes from unset to set. */
2681
2682 if (!link->network)
2683 return 0;
2684
2685 if (link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_DOWN) {
2686 log_link_info(link, "ActivationPolicy is \"always-off\", forcing link down");
2687 return link_down(link, NULL);
2688 }
2689
2690 /* We set the ipv6 mtu after the device mtu, but the kernel resets
2691 * ipv6 mtu on NETDEV_UP, so we need to reset it. The check for
2692 * ipv6_mtu_set prevents this from trying to set it too early before
2693 * the link->network has been setup; we only need to reset it
2694 * here if we've already set it during normal initialization. */
2695 if (link->ipv6_mtu_set) {
2696 r = link_set_ipv6_mtu(link);
2697 if (r < 0)
2698 return r;
2699 }
2700
2701 return 0;
2702 }
2703
2704 static int link_admin_state_down(Link *link) {
2705 assert(link);
2706
2707 if (!link->network)
2708 return 0;
2709
2710 if (link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) {
2711 log_link_info(link, "ActivationPolicy is \"always-on\", forcing link up");
2712 return link_up(link);
2713 }
2714
2715 return 0;
2716 }
2717
2718 static int link_update(Link *link, sd_netlink_message *m) {
2719 _cleanup_strv_free_ char **s = NULL;
2720 hw_addr_data hw_addr;
2721 const char *ifname;
2722 uint32_t mtu;
2723 bool had_carrier, carrier_gained, carrier_lost, link_was_admin_up;
2724 int old_master, r;
2725
2726 assert(link);
2727 assert(link->ifname);
2728 assert(m);
2729
2730 if (link->state == LINK_STATE_LINGER) {
2731 log_link_info(link, "Link re-added");
2732 link_set_state(link, LINK_STATE_CONFIGURING);
2733
2734 r = link_new_carrier_maps(link);
2735 if (r < 0)
2736 return r;
2737 }
2738
2739 r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
2740 if (r >= 0 && !streq(ifname, link->ifname)) {
2741 Manager *manager = link->manager;
2742
2743 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
2744
2745 link_drop(link);
2746 r = link_add(manager, m, &link);
2747 if (r < 0)
2748 return r;
2749 }
2750
2751 r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
2752 if (r >= 0)
2753 strv_free_and_replace(link->alternative_names, s);
2754
2755 r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
2756 if (r >= 0 && mtu > 0) {
2757 link->mtu = mtu;
2758 if (link->original_mtu == 0) {
2759 link->original_mtu = mtu;
2760 log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
2761 }
2762
2763 if (link->dhcp_client) {
2764 r = sd_dhcp_client_set_mtu(link->dhcp_client,
2765 link->mtu);
2766 if (r < 0)
2767 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
2768 }
2769
2770 if (link->radv) {
2771 r = sd_radv_set_mtu(link->radv, link->mtu);
2772 if (r < 0)
2773 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
2774 }
2775 }
2776
2777 /* The kernel may broadcast NEWLINK messages without the MAC address
2778 set, simply ignore them. */
2779 r = netlink_message_read_hw_addr(m, IFLA_ADDRESS, &hw_addr);
2780 if (r >= 0 && (link->hw_addr.length != hw_addr.length ||
2781 memcmp(link->hw_addr.addr.bytes, hw_addr.addr.bytes, hw_addr.length) != 0)) {
2782
2783 memcpy(link->hw_addr.addr.bytes, hw_addr.addr.bytes, hw_addr.length);
2784
2785 log_link_debug(link, "Gained new hardware address: %s", HW_ADDR_TO_STR(&hw_addr));
2786
2787 r = ipv4ll_update_mac(link);
2788 if (r < 0)
2789 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
2790
2791 r = dhcp4_update_mac(link);
2792 if (r < 0)
2793 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
2794
2795 r = dhcp6_update_mac(link);
2796 if (r < 0)
2797 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
2798
2799 r = radv_update_mac(link);
2800 if (r < 0)
2801 return log_link_warning_errno(link, r, "Could not update MAC address for Router Advertisement: %m");
2802
2803 if (link->ndisc) {
2804 r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.addr.ether);
2805 if (r < 0)
2806 return log_link_warning_errno(link, r, "Could not update MAC for NDisc: %m");
2807 }
2808
2809 r = ipv4_dad_update_mac(link);
2810 if (r < 0)
2811 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m");
2812 }
2813
2814 old_master = link->master_ifindex;
2815 (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
2816
2817 link_was_admin_up = link->flags & IFF_UP;
2818 had_carrier = link_has_carrier(link);
2819
2820 r = link_update_flags(link, m, old_master != link->master_ifindex);
2821 if (r < 0)
2822 return r;
2823
2824 if (!link_was_admin_up && (link->flags & IFF_UP)) {
2825 log_link_info(link, "Link UP");
2826
2827 r = link_admin_state_up(link);
2828 if (r < 0)
2829 return r;
2830 } else if (link_was_admin_up && !(link->flags & IFF_UP)) {
2831 log_link_info(link, "Link DOWN");
2832
2833 r = link_admin_state_down(link);
2834 if (r < 0)
2835 return r;
2836 }
2837
2838 r = link_update_lldp(link);
2839 if (r < 0)
2840 return r;
2841
2842 carrier_gained = !had_carrier && link_has_carrier(link);
2843 carrier_lost = had_carrier && !link_has_carrier(link);
2844
2845 if (carrier_gained) {
2846 log_link_info(link, "Gained carrier");
2847
2848 r = link_carrier_gained(link);
2849 if (r < 0)
2850 return r;
2851 } else if (carrier_lost) {
2852 log_link_info(link, "Lost carrier");
2853
2854 r = link_carrier_lost(link);
2855 if (r < 0)
2856 return r;
2857 }
2858
2859 return 0;
2860 }
2861
2862 int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, Manager *m) {
2863 Link *link = NULL;
2864 NetDev *netdev = NULL;
2865 uint16_t type;
2866 const char *name;
2867 int r, ifindex;
2868
2869 assert(rtnl);
2870 assert(message);
2871 assert(m);
2872
2873 if (sd_netlink_message_is_error(message)) {
2874 r = sd_netlink_message_get_errno(message);
2875 if (r < 0)
2876 log_message_warning_errno(message, r, "rtnl: Could not receive link message, ignoring");
2877
2878 return 0;
2879 }
2880
2881 r = sd_netlink_message_get_type(message, &type);
2882 if (r < 0) {
2883 log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
2884 return 0;
2885 } else if (!IN_SET(type, RTM_NEWLINK, RTM_DELLINK)) {
2886 log_warning("rtnl: Received unexpected message type %u when processing link, ignoring.", type);
2887 return 0;
2888 }
2889
2890 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2891 if (r < 0) {
2892 log_warning_errno(r, "rtnl: Could not get ifindex from link message, ignoring: %m");
2893 return 0;
2894 } else if (ifindex <= 0) {
2895 log_warning("rtnl: received link message with invalid ifindex %d, ignoring.", ifindex);
2896 return 0;
2897 }
2898
2899 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
2900 if (r < 0) {
2901 log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
2902 return 0;
2903 }
2904
2905 (void) link_get(m, ifindex, &link);
2906 (void) netdev_get(m, name, &netdev);
2907
2908 switch (type) {
2909 case RTM_NEWLINK:
2910 if (!link) {
2911 /* link is new, so add it */
2912 r = link_add(m, message, &link);
2913 if (r < 0) {
2914 log_warning_errno(r, "Could not process new link message, ignoring: %m");
2915 return 0;
2916 }
2917 }
2918
2919 if (netdev) {
2920 /* netdev exists, so make sure the ifindex matches */
2921 r = netdev_set_ifindex(netdev, message);
2922 if (r < 0) {
2923 log_warning_errno(r, "Could not process new link message for netdev, ignoring: %m");
2924 return 0;
2925 }
2926 }
2927
2928 r = link_update(link, message);
2929 if (r < 0) {
2930 log_warning_errno(r, "Could not process link message, ignoring: %m");
2931 return 0;
2932 }
2933
2934 break;
2935
2936 case RTM_DELLINK:
2937 link_drop(link);
2938 netdev_drop(netdev);
2939
2940 break;
2941
2942 default:
2943 assert_not_reached("Received link message with invalid RTNL message type.");
2944 }
2945
2946 return 1;
2947 }
2948
2949 static const char* const link_state_table[_LINK_STATE_MAX] = {
2950 [LINK_STATE_PENDING] = "pending",
2951 [LINK_STATE_INITIALIZED] = "initialized",
2952 [LINK_STATE_CONFIGURING] = "configuring",
2953 [LINK_STATE_CONFIGURED] = "configured",
2954 [LINK_STATE_UNMANAGED] = "unmanaged",
2955 [LINK_STATE_FAILED] = "failed",
2956 [LINK_STATE_LINGER] = "linger",
2957 };
2958
2959 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
2960
2961 int log_link_message_full_errno(Link *link, sd_netlink_message *m, int level, int err, const char *msg) {
2962 const char *err_msg = NULL;
2963
2964 (void) sd_netlink_message_read_string(m, NLMSGERR_ATTR_MSG, &err_msg);
2965 return log_link_full_errno(link, level, err,
2966 "%s: %s%s%s%m",
2967 msg,
2968 strempty(err_msg),
2969 err_msg && !endswith(err_msg, ".") ? "." : "",
2970 err_msg ? " " : "");
2971 }
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