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[thirdparty/systemd.git] / src / network / networkd-link.c
1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include <net/if.h>
4 #include <netinet/in.h>
5 #include <linux/if.h>
6 #include <linux/if_arp.h>
7 #include <linux/if_link.h>
8 #include <linux/netdevice.h>
9 #include <sys/socket.h>
10 #include <unistd.h>
11
12 #include "alloc-util.h"
13 #include "arphrd-util.h"
14 #include "batadv.h"
15 #include "bond.h"
16 #include "bridge.h"
17 #include "bus-util.h"
18 #include "device-private.h"
19 #include "device-util.h"
20 #include "dhcp-identifier.h"
21 #include "dhcp-lease-internal.h"
22 #include "env-file.h"
23 #include "ethtool-util.h"
24 #include "event-util.h"
25 #include "fd-util.h"
26 #include "fileio.h"
27 #include "format-util.h"
28 #include "fs-util.h"
29 #include "glyph-util.h"
30 #include "logarithm.h"
31 #include "missing_network.h"
32 #include "netlink-util.h"
33 #include "network-internal.h"
34 #include "networkd-address-label.h"
35 #include "networkd-address.h"
36 #include "networkd-bridge-fdb.h"
37 #include "networkd-bridge-mdb.h"
38 #include "networkd-bridge-vlan.h"
39 #include "networkd-can.h"
40 #include "networkd-dhcp-prefix-delegation.h"
41 #include "networkd-dhcp-server.h"
42 #include "networkd-dhcp4.h"
43 #include "networkd-dhcp6.h"
44 #include "networkd-ipv4acd.h"
45 #include "networkd-ipv4ll.h"
46 #include "networkd-ipv6-proxy-ndp.h"
47 #include "networkd-link-bus.h"
48 #include "networkd-link.h"
49 #include "networkd-lldp-tx.h"
50 #include "networkd-manager.h"
51 #include "networkd-ndisc.h"
52 #include "networkd-neighbor.h"
53 #include "networkd-nexthop.h"
54 #include "networkd-queue.h"
55 #include "networkd-radv.h"
56 #include "networkd-route-util.h"
57 #include "networkd-route.h"
58 #include "networkd-routing-policy-rule.h"
59 #include "networkd-setlink.h"
60 #include "networkd-sriov.h"
61 #include "networkd-state-file.h"
62 #include "networkd-sysctl.h"
63 #include "networkd-wifi.h"
64 #include "set.h"
65 #include "socket-util.h"
66 #include "stdio-util.h"
67 #include "string-table.h"
68 #include "strv.h"
69 #include "tc.h"
70 #include "tmpfile-util.h"
71 #include "tuntap.h"
72 #include "udev-util.h"
73 #include "vrf.h"
74
75 bool link_ipv6_enabled(Link *link) {
76 assert(link);
77
78 if (!socket_ipv6_is_supported())
79 return false;
80
81 if (link->iftype == ARPHRD_CAN)
82 return false;
83
84 if (!link->network)
85 return false;
86
87 if (link->network->bond)
88 return false;
89
90 if (link_may_have_ipv6ll(link, /* check_multicast = */ false))
91 return true;
92
93 if (network_has_static_ipv6_configurations(link->network))
94 return true;
95
96 return false;
97 }
98
99 bool link_has_ipv6_connectivity(Link *link) {
100 LinkAddressState ipv6_address_state;
101
102 assert(link);
103
104 link_get_address_states(link, NULL, &ipv6_address_state, NULL);
105
106 switch (ipv6_address_state) {
107 case LINK_ADDRESS_STATE_ROUTABLE:
108 /* If the interface has a routable IPv6 address, then we assume yes. */
109 return true;
110
111 case LINK_ADDRESS_STATE_DEGRADED:
112 /* If the interface has only degraded IPv6 address (mostly, link-local address), then let's check
113 * there is an IPv6 default gateway. */
114 return link_has_default_gateway(link, AF_INET6);
115
116 case LINK_ADDRESS_STATE_OFF:
117 /* No IPv6 address. */
118 return false;
119
120 default:
121 assert_not_reached();
122 }
123 }
124
125 static bool link_is_ready_to_configure_one(Link *link, bool allow_unmanaged) {
126 assert(link);
127
128 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED, LINK_STATE_UNMANAGED))
129 return false;
130
131 if (!link->network)
132 return allow_unmanaged;
133
134 if (!link->network->configure_without_carrier) {
135 if (link->set_flags_messages > 0)
136 return false;
137
138 if (!link_has_carrier(link))
139 return false;
140 }
141
142 if (link->set_link_messages > 0)
143 return false;
144
145 if (!link->activated)
146 return false;
147
148 return true;
149 }
150
151 bool link_is_ready_to_configure(Link *link, bool allow_unmanaged) {
152 return check_ready_for_all_sr_iov_ports(link, allow_unmanaged, link_is_ready_to_configure_one);
153 }
154
155 void link_ntp_settings_clear(Link *link) {
156 link->ntp = strv_free(link->ntp);
157 }
158
159 void link_dns_settings_clear(Link *link) {
160 if (link->n_dns != UINT_MAX)
161 for (unsigned i = 0; i < link->n_dns; i++)
162 in_addr_full_free(link->dns[i]);
163 link->dns = mfree(link->dns);
164 link->n_dns = UINT_MAX;
165
166 link->search_domains = ordered_set_free(link->search_domains);
167 link->route_domains = ordered_set_free(link->route_domains);
168
169 link->dns_default_route = -1;
170 link->llmnr = _RESOLVE_SUPPORT_INVALID;
171 link->mdns = _RESOLVE_SUPPORT_INVALID;
172 link->dnssec_mode = _DNSSEC_MODE_INVALID;
173 link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
174
175 link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
176 }
177
178 static void link_free_engines(Link *link) {
179 if (!link)
180 return;
181
182 link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
183
184 link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client);
185 link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
186 link->dhcp4_6rd_tunnel_name = mfree(link->dhcp4_6rd_tunnel_name);
187
188 link->lldp_rx = sd_lldp_rx_unref(link->lldp_rx);
189 link->lldp_tx = sd_lldp_tx_unref(link->lldp_tx);
190
191 link->ipv4acd_by_address = hashmap_free(link->ipv4acd_by_address);
192
193 link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
194
195 link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
196 link->dhcp6_lease = sd_dhcp6_lease_unref(link->dhcp6_lease);
197
198 link->ndisc = sd_ndisc_unref(link->ndisc);
199 link->ndisc_expire = sd_event_source_disable_unref(link->ndisc_expire);
200 ndisc_flush(link);
201
202 link->radv = sd_radv_unref(link->radv);
203 }
204
205 static Link *link_free(Link *link) {
206 assert(link);
207
208 link_ntp_settings_clear(link);
209 link_dns_settings_clear(link);
210
211 link->routes = set_free(link->routes);
212 link->nexthops = set_free(link->nexthops);
213 link->neighbors = set_free(link->neighbors);
214 link->addresses = set_free(link->addresses);
215 link->qdiscs = set_free(link->qdiscs);
216 link->tclasses = set_free(link->tclasses);
217
218 link->dhcp_pd_prefixes = set_free(link->dhcp_pd_prefixes);
219
220 link_free_engines(link);
221
222 set_free(link->sr_iov_virt_port_ifindices);
223 free(link->ifname);
224 strv_free(link->alternative_names);
225 free(link->kind);
226 free(link->ssid);
227 free(link->previous_ssid);
228 free(link->driver);
229
230 unlink_and_free(link->lease_file);
231 unlink_and_free(link->lldp_file);
232 unlink_and_free(link->state_file);
233
234 sd_device_unref(link->dev);
235 netdev_unref(link->netdev);
236
237 hashmap_free(link->bound_to_links);
238 hashmap_free(link->bound_by_links);
239
240 set_free_with_destructor(link->slaves, link_unref);
241
242 network_unref(link->network);
243
244 sd_event_source_disable_unref(link->carrier_lost_timer);
245
246 return mfree(link);
247 }
248
249 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
250
251 int link_get_by_index(Manager *m, int ifindex, Link **ret) {
252 Link *link;
253
254 assert(m);
255
256 if (ifindex <= 0)
257 return -EINVAL;
258
259 link = hashmap_get(m->links_by_index, INT_TO_PTR(ifindex));
260 if (!link)
261 return -ENODEV;
262
263 if (ret)
264 *ret = link;
265 return 0;
266 }
267
268 int link_get_by_name(Manager *m, const char *ifname, Link **ret) {
269 Link *link;
270
271 assert(m);
272 assert(ifname);
273
274 link = hashmap_get(m->links_by_name, ifname);
275 if (!link)
276 return -ENODEV;
277
278 if (ret)
279 *ret = link;
280 return 0;
281 }
282
283 int link_get_by_hw_addr(Manager *m, const struct hw_addr_data *hw_addr, Link **ret) {
284 Link *link;
285
286 assert(m);
287 assert(hw_addr);
288
289 link = hashmap_get(m->links_by_hw_addr, hw_addr);
290 if (!link)
291 return -ENODEV;
292
293 if (ret)
294 *ret = link;
295 return 0;
296 }
297
298 int link_get_master(Link *link, Link **ret) {
299 assert(link);
300 assert(link->manager);
301 assert(ret);
302
303 if (link->master_ifindex <= 0 || link->master_ifindex == link->ifindex)
304 return -ENODEV;
305
306 return link_get_by_index(link->manager, link->master_ifindex, ret);
307 }
308
309 void link_set_state(Link *link, LinkState state) {
310 assert(link);
311
312 if (link->state == state)
313 return;
314
315 log_link_debug(link, "State changed: %s -> %s",
316 link_state_to_string(link->state),
317 link_state_to_string(state));
318
319 link->state = state;
320
321 link_send_changed(link, "AdministrativeState", NULL);
322 link_dirty(link);
323 }
324
325 int link_stop_engines(Link *link, bool may_keep_dhcp) {
326 int r = 0, k;
327
328 assert(link);
329 assert(link->manager);
330 assert(link->manager->event);
331
332 bool keep_dhcp = may_keep_dhcp &&
333 link->network &&
334 !link->network->dhcp_send_decline && /* IPv4 ACD for the DHCPv4 address is running. */
335 (link->manager->restarting ||
336 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
337
338 if (!keep_dhcp) {
339 k = sd_dhcp_client_stop(link->dhcp_client);
340 if (k < 0)
341 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
342 }
343
344 k = sd_dhcp_server_stop(link->dhcp_server);
345 if (k < 0)
346 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 server: %m");
347
348 k = sd_lldp_rx_stop(link->lldp_rx);
349 if (k < 0)
350 r = log_link_warning_errno(link, k, "Could not stop LLDP Rx: %m");
351
352 k = sd_lldp_tx_stop(link->lldp_tx);
353 if (k < 0)
354 r = log_link_warning_errno(link, k, "Could not stop LLDP Tx: %m");
355
356 k = sd_ipv4ll_stop(link->ipv4ll);
357 if (k < 0)
358 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
359
360 k = ipv4acd_stop(link);
361 if (k < 0)
362 r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client: %m");
363
364 k = sd_dhcp6_client_stop(link->dhcp6_client);
365 if (k < 0)
366 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
367
368 k = dhcp_pd_remove(link, /* only_marked = */ false);
369 if (k < 0)
370 r = log_link_warning_errno(link, k, "Could not remove DHCPv6 PD addresses and routes: %m");
371
372 k = ndisc_stop(link);
373 if (k < 0)
374 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
375
376 ndisc_flush(link);
377
378 k = sd_radv_stop(link->radv);
379 if (k < 0)
380 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
381
382 return r;
383 }
384
385 void link_enter_failed(Link *link) {
386 assert(link);
387
388 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
389 return;
390
391 log_link_warning(link, "Failed");
392
393 link_set_state(link, LINK_STATE_FAILED);
394
395 (void) link_stop_engines(link, false);
396 }
397
398 void link_check_ready(Link *link) {
399 Address *a;
400
401 assert(link);
402
403 if (link->state == LINK_STATE_CONFIGURED)
404 return;
405
406 if (link->state != LINK_STATE_CONFIGURING)
407 return (void) log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state));
408
409 if (!link->network)
410 return (void) log_link_debug(link, "%s(): link is unmanaged.", __func__);
411
412 if (!link->tc_configured)
413 return (void) log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
414
415 if (link->set_link_messages > 0)
416 return (void) log_link_debug(link, "%s(): link layer is configuring.", __func__);
417
418 if (!link->activated)
419 return (void) log_link_debug(link, "%s(): link is not activated.", __func__);
420
421 if (link->iftype == ARPHRD_CAN) {
422 /* let's shortcut things for CAN which doesn't need most of checks below. */
423 link_set_state(link, LINK_STATE_CONFIGURED);
424 return;
425 }
426
427 if (!link->stacked_netdevs_created)
428 return (void) log_link_debug(link, "%s(): stacked netdevs are not created.", __func__);
429
430 if (!link->static_addresses_configured)
431 return (void) log_link_debug(link, "%s(): static addresses are not configured.", __func__);
432
433 if (!link->static_address_labels_configured)
434 return (void) log_link_debug(link, "%s(): static address labels are not configured.", __func__);
435
436 if (!link->static_bridge_fdb_configured)
437 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
438
439 if (!link->static_bridge_mdb_configured)
440 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
441
442 if (!link->static_ipv6_proxy_ndp_configured)
443 return (void) log_link_debug(link, "%s(): static IPv6 proxy NDP addresses are not configured.", __func__);
444
445 if (!link->static_neighbors_configured)
446 return (void) log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
447
448 if (!link->static_nexthops_configured)
449 return (void) log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
450
451 if (!link->static_routes_configured)
452 return (void) log_link_debug(link, "%s(): static routes are not configured.", __func__);
453
454 if (!link->static_routing_policy_rules_configured)
455 return (void) log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
456
457 if (!link->sr_iov_configured)
458 return (void) log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
459
460 /* IPv6LL is assigned after the link gains its carrier. */
461 if (!link->network->configure_without_carrier &&
462 link_ipv6ll_enabled(link) &&
463 !in6_addr_is_set(&link->ipv6ll_address))
464 return (void) log_link_debug(link, "%s(): IPv6LL is not configured yet.", __func__);
465
466 /* All static addresses must be ready. */
467 bool has_static_address = false;
468 SET_FOREACH(a, link->addresses) {
469 if (a->source != NETWORK_CONFIG_SOURCE_STATIC)
470 continue;
471 if (!address_is_ready(a))
472 return (void) log_link_debug(link, "%s(): static address %s is not ready.", __func__,
473 IN_ADDR_PREFIX_TO_STRING(a->family, &a->in_addr, a->prefixlen));
474 has_static_address = true;
475 }
476
477 /* If at least one static address is requested, do not request that dynamic addressing protocols are finished. */
478 if (has_static_address)
479 goto ready;
480
481 /* If no dynamic addressing protocol enabled, assume the interface is ready.
482 * Note, ignore NDisc when ConfigureWithoutCarrier= is enabled, as IPv6AcceptRA= is enabled by default. */
483 if (!link_ipv4ll_enabled(link) && !link_dhcp4_enabled(link) &&
484 !link_dhcp6_enabled(link) && !link_dhcp_pd_is_enabled(link) &&
485 (link->network->configure_without_carrier || !link_ipv6_accept_ra_enabled(link)))
486 goto ready;
487
488 bool ipv4ll_ready =
489 link_ipv4ll_enabled(link) && link->ipv4ll_address_configured &&
490 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_IPV4LL);
491 bool dhcp4_ready =
492 link_dhcp4_enabled(link) && link->dhcp4_configured &&
493 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP4);
494 bool dhcp6_ready =
495 link_dhcp6_enabled(link) && link->dhcp6_configured &&
496 (!link->network->dhcp6_use_address ||
497 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP6));
498 bool dhcp_pd_ready =
499 link_dhcp_pd_is_enabled(link) && link->dhcp_pd_configured &&
500 (!link->network->dhcp_pd_assign ||
501 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP_PD));
502 bool ndisc_ready =
503 link_ipv6_accept_ra_enabled(link) && link->ndisc_configured &&
504 (!link->network->ipv6_accept_ra_use_autonomous_prefix ||
505 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_NDISC));
506
507 /* If the uplink for PD is self, then request the corresponding DHCP protocol is also ready. */
508 if (dhcp_pd_is_uplink(link, link, /* accept_auto = */ false)) {
509 if (link_dhcp4_enabled(link) && link->network->dhcp_use_6rd &&
510 sd_dhcp_lease_has_6rd(link->dhcp_lease)) {
511 if (!dhcp4_ready)
512 return (void) log_link_debug(link, "%s(): DHCPv4 6rd prefix is assigned, but DHCPv4 protocol is not finished yet.", __func__);
513 if (!dhcp_pd_ready)
514 return (void) log_link_debug(link, "%s(): DHCPv4 is finished, but prefix acquired by DHCPv4-6rd is not assigned yet.", __func__);
515 }
516
517 if (link_dhcp6_enabled(link) && link->network->dhcp6_use_pd_prefix &&
518 sd_dhcp6_lease_has_pd_prefix(link->dhcp6_lease)) {
519 if (!dhcp6_ready)
520 return (void) log_link_debug(link, "%s(): DHCPv6 IA_PD prefix is assigned, but DHCPv6 protocol is not finished yet.", __func__);
521 if (!dhcp_pd_ready)
522 return (void) log_link_debug(link, "%s(): DHCPv6 is finished, but prefix acquired by DHCPv6 IA_PD is not assigned yet.", __func__);
523 }
524 }
525
526 /* At least one dynamic addressing protocol is finished. */
527 if (!ipv4ll_ready && !dhcp4_ready && !dhcp6_ready && !dhcp_pd_ready && !ndisc_ready)
528 return (void) log_link_debug(link, "%s(): dynamic addressing protocols are enabled but none of them finished yet.", __func__);
529
530 log_link_debug(link, "%s(): IPv4LL:%s DHCPv4:%s DHCPv6:%s DHCP-PD:%s NDisc:%s",
531 __func__,
532 yes_no(ipv4ll_ready),
533 yes_no(dhcp4_ready),
534 yes_no(dhcp6_ready),
535 yes_no(dhcp_pd_ready),
536 yes_no(ndisc_ready));
537
538 ready:
539 link_set_state(link, LINK_STATE_CONFIGURED);
540 }
541
542 static int link_request_static_configs(Link *link) {
543 int r;
544
545 assert(link);
546 assert(link->network);
547 assert(link->state != _LINK_STATE_INVALID);
548
549 r = link_request_static_addresses(link);
550 if (r < 0)
551 return r;
552
553 r = link_request_static_address_labels(link);
554 if (r < 0)
555 return r;
556
557 r = link_request_static_bridge_fdb(link);
558 if (r < 0)
559 return r;
560
561 r = link_request_static_bridge_mdb(link);
562 if (r < 0)
563 return r;
564
565 r = link_request_static_ipv6_proxy_ndp_addresses(link);
566 if (r < 0)
567 return r;
568
569 r = link_request_static_neighbors(link);
570 if (r < 0)
571 return r;
572
573 r = link_request_static_nexthops(link, false);
574 if (r < 0)
575 return r;
576
577 r = link_request_static_routes(link, false);
578 if (r < 0)
579 return r;
580
581 r = link_request_static_routing_policy_rules(link);
582 if (r < 0)
583 return r;
584
585 return 0;
586 }
587
588 static int link_request_stacked_netdevs(Link *link) {
589 NetDev *netdev;
590 int r;
591
592 assert(link);
593
594 link->stacked_netdevs_created = false;
595
596 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) {
597 r = link_request_stacked_netdev(link, netdev);
598 if (r < 0)
599 return r;
600 }
601
602 if (link->create_stacked_netdev_messages == 0) {
603 link->stacked_netdevs_created = true;
604 link_check_ready(link);
605 }
606
607 return 0;
608 }
609
610 static int link_acquire_dynamic_ipv6_conf(Link *link) {
611 int r;
612
613 assert(link);
614
615 r = radv_start(link);
616 if (r < 0)
617 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Advertisement engine: %m");
618
619 r = ndisc_start(link);
620 if (r < 0)
621 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Discovery: %m");
622
623 r = dhcp6_start(link);
624 if (r < 0)
625 return log_link_warning_errno(link, r, "Failed to start DHCPv6 client: %m");
626
627 return 0;
628 }
629
630 static int link_acquire_dynamic_ipv4_conf(Link *link) {
631 int r;
632
633 assert(link);
634 assert(link->manager);
635 assert(link->manager->event);
636
637 if (link->dhcp_client) {
638 r = dhcp4_start(link);
639 if (r < 0)
640 return log_link_warning_errno(link, r, "Failed to start DHCPv4 client: %m");
641
642 log_link_debug(link, "Acquiring DHCPv4 lease.");
643
644 } else if (link->ipv4ll) {
645 if (in4_addr_is_set(&link->network->ipv4ll_start_address)) {
646 r = sd_ipv4ll_set_address(link->ipv4ll, &link->network->ipv4ll_start_address);
647 if (r < 0)
648 return log_link_warning_errno(link, r, "Could not set IPv4 link-local start address: %m");
649 }
650
651 r = sd_ipv4ll_start(link->ipv4ll);
652 if (r < 0)
653 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
654
655 log_link_debug(link, "Acquiring IPv4 link-local address.");
656 }
657
658 if (link->dhcp_server) {
659 r = sd_dhcp_server_start(link->dhcp_server);
660 if (r < 0)
661 return log_link_warning_errno(link, r, "Could not start DHCP server: %m");
662 }
663
664 r = ipv4acd_start(link);
665 if (r < 0)
666 return log_link_warning_errno(link, r, "Could not start IPv4 ACD client: %m");
667
668 return 0;
669 }
670
671 static int link_acquire_dynamic_conf(Link *link) {
672 int r;
673
674 assert(link);
675 assert(link->network);
676
677 r = link_acquire_dynamic_ipv4_conf(link);
678 if (r < 0)
679 return r;
680
681 if (in6_addr_is_set(&link->ipv6ll_address)) {
682 r = link_acquire_dynamic_ipv6_conf(link);
683 if (r < 0)
684 return r;
685 }
686
687 if (!link_radv_enabled(link) || !link->network->dhcp_pd_announce) {
688 /* DHCPv6PD downstream does not require IPv6LL address. But may require RADV to be
689 * configured, and RADV may not be configured yet here. Only acquire subnet prefix when
690 * RADV is disabled, or the announcement of the prefix is disabled. Otherwise, the
691 * below will be called in radv_start(). */
692 r = dhcp_request_prefix_delegation(link);
693 if (r < 0)
694 return log_link_warning_errno(link, r, "Failed to request DHCP delegated subnet prefix: %m");
695 }
696
697 if (link->lldp_tx) {
698 r = sd_lldp_tx_start(link->lldp_tx);
699 if (r < 0)
700 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
701 }
702
703 if (link->lldp_rx) {
704 r = sd_lldp_rx_start(link->lldp_rx);
705 if (r < 0)
706 return log_link_warning_errno(link, r, "Failed to start LLDP client: %m");
707 }
708
709 return 0;
710 }
711
712 int link_ipv6ll_gained(Link *link) {
713 int r;
714
715 assert(link);
716
717 log_link_info(link, "Gained IPv6LL");
718
719 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
720 return 0;
721
722 r = link_acquire_dynamic_ipv6_conf(link);
723 if (r < 0)
724 return r;
725
726 link_check_ready(link);
727 return 0;
728 }
729
730 int link_handle_bound_to_list(Link *link) {
731 bool required_up = false;
732 bool link_is_up = false;
733 Link *l;
734
735 assert(link);
736
737 /* If at least one interface in bound_to_links has carrier, then make this interface up.
738 * If all interfaces in bound_to_links do not, then make this interface down. */
739
740 if (hashmap_isempty(link->bound_to_links))
741 return 0;
742
743 if (link->flags & IFF_UP)
744 link_is_up = true;
745
746 HASHMAP_FOREACH(l, link->bound_to_links)
747 if (link_has_carrier(l)) {
748 required_up = true;
749 break;
750 }
751
752 if (!required_up && link_is_up)
753 return link_request_to_bring_up_or_down(link, /* up = */ false);
754 if (required_up && !link_is_up)
755 return link_request_to_bring_up_or_down(link, /* up = */ true);
756
757 return 0;
758 }
759
760 static int link_handle_bound_by_list(Link *link) {
761 Link *l;
762 int r;
763
764 assert(link);
765
766 /* Update up or down state of interfaces which depend on this interface's carrier state. */
767
768 if (hashmap_isempty(link->bound_by_links))
769 return 0;
770
771 HASHMAP_FOREACH(l, link->bound_by_links) {
772 r = link_handle_bound_to_list(l);
773 if (r < 0)
774 return r;
775 }
776
777 return 0;
778 }
779
780 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
781 int r;
782
783 assert(link);
784 assert(carrier);
785
786 if (link == carrier)
787 return 0;
788
789 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
790 return 0;
791
792 r = hashmap_ensure_put(h, NULL, INT_TO_PTR(carrier->ifindex), carrier);
793 if (r < 0)
794 return r;
795
796 link_dirty(link);
797
798 return 0;
799 }
800
801 static int link_new_bound_by_list(Link *link) {
802 Manager *m;
803 Link *carrier;
804 int r;
805
806 assert(link);
807 assert(link->manager);
808
809 m = link->manager;
810
811 HASHMAP_FOREACH(carrier, m->links_by_index) {
812 if (!carrier->network)
813 continue;
814
815 if (strv_isempty(carrier->network->bind_carrier))
816 continue;
817
818 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
819 r = link_put_carrier(link, carrier, &link->bound_by_links);
820 if (r < 0)
821 return r;
822 }
823 }
824
825 HASHMAP_FOREACH(carrier, link->bound_by_links) {
826 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
827 if (r < 0)
828 return r;
829 }
830
831 return 0;
832 }
833
834 static int link_new_bound_to_list(Link *link) {
835 Manager *m;
836 Link *carrier;
837 int r;
838
839 assert(link);
840 assert(link->manager);
841
842 if (!link->network)
843 return 0;
844
845 if (strv_isempty(link->network->bind_carrier))
846 return 0;
847
848 m = link->manager;
849
850 HASHMAP_FOREACH(carrier, m->links_by_index) {
851 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
852 r = link_put_carrier(link, carrier, &link->bound_to_links);
853 if (r < 0)
854 return r;
855 }
856 }
857
858 HASHMAP_FOREACH(carrier, link->bound_to_links) {
859 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
860 if (r < 0)
861 return r;
862 }
863
864 return 0;
865 }
866
867 static void link_free_bound_to_list(Link *link) {
868 bool updated = false;
869 Link *bound_to;
870
871 assert(link);
872
873 while ((bound_to = hashmap_steal_first(link->bound_to_links))) {
874 updated = true;
875
876 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
877 link_dirty(bound_to);
878 }
879
880 if (updated)
881 link_dirty(link);
882 }
883
884 static void link_free_bound_by_list(Link *link) {
885 bool updated = false;
886 Link *bound_by;
887
888 assert(link);
889
890 while ((bound_by = hashmap_steal_first(link->bound_by_links))) {
891 updated = true;
892
893 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
894 link_dirty(bound_by);
895 link_handle_bound_to_list(bound_by);
896 }
897 }
898
899 if (updated)
900 link_dirty(link);
901 }
902
903 static int link_append_to_master(Link *link) {
904 Link *master;
905 int r;
906
907 assert(link);
908
909 /* - The link may have no master.
910 * - RTM_NEWLINK message about master interface may not be received yet. */
911 if (link_get_master(link, &master) < 0)
912 return 0;
913
914 r = set_ensure_put(&master->slaves, NULL, link);
915 if (r <= 0)
916 return r;
917
918 link_ref(link);
919 return 0;
920 }
921
922 static void link_drop_from_master(Link *link) {
923 Link *master;
924
925 assert(link);
926
927 if (!link->manager)
928 return;
929
930 if (link_get_master(link, &master) < 0)
931 return;
932
933 link_unref(set_remove(master->slaves, link));
934 }
935
936 static void link_drop_requests(Link *link) {
937 Request *req;
938
939 assert(link);
940 assert(link->manager);
941
942 ORDERED_SET_FOREACH(req, link->manager->request_queue)
943 if (req->link == link)
944 request_detach(link->manager, req);
945 }
946
947 static Link *link_drop(Link *link) {
948 if (!link)
949 return NULL;
950
951 assert(link->manager);
952
953 link_set_state(link, LINK_STATE_LINGER);
954
955 /* Drop all references from other links and manager. Note that async netlink calls may have
956 * references to the link, and they will be dropped when we receive replies. */
957
958 link_drop_requests(link);
959
960 link_free_bound_to_list(link);
961 link_free_bound_by_list(link);
962
963 link_clear_sr_iov_ifindices(link);
964
965 link_drop_from_master(link);
966
967 if (link->state_file)
968 (void) unlink(link->state_file);
969
970 link_clean(link);
971
972 STRV_FOREACH(n, link->alternative_names)
973 hashmap_remove(link->manager->links_by_name, *n);
974 hashmap_remove(link->manager->links_by_name, link->ifname);
975
976 /* bonding master and its slaves have the same hardware address. */
977 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
978
979 /* The following must be called at last. */
980 assert_se(hashmap_remove(link->manager->links_by_index, INT_TO_PTR(link->ifindex)) == link);
981 return link_unref(link);
982 }
983
984 static int link_drop_foreign_config(Link *link) {
985 int r;
986
987 assert(link);
988 assert(link->manager);
989
990 /* Drop foreign config, but ignore unmanaged, loopback, or critical interfaces. We do not want
991 * to remove loopback address or addresses used for root NFS. */
992
993 if (IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
994 return 0;
995 if (FLAGS_SET(link->flags, IFF_LOOPBACK))
996 return 0;
997 if (link->network->keep_configuration == KEEP_CONFIGURATION_YES)
998 return 0;
999
1000 r = link_drop_foreign_routes(link);
1001
1002 RET_GATHER(r, link_drop_foreign_nexthops(link));
1003 RET_GATHER(r, link_drop_foreign_addresses(link));
1004 RET_GATHER(r, link_drop_foreign_neighbors(link));
1005 RET_GATHER(r, manager_drop_foreign_routing_policy_rules(link->manager));
1006
1007 return r;
1008 }
1009
1010 static int link_drop_managed_config(Link *link) {
1011 int r;
1012
1013 assert(link);
1014 assert(link->manager);
1015
1016 r = link_drop_managed_routes(link);
1017
1018 RET_GATHER(r, link_drop_managed_nexthops(link));
1019 RET_GATHER(r, link_drop_managed_addresses(link));
1020 RET_GATHER(r, link_drop_managed_neighbors(link));
1021 RET_GATHER(r, link_drop_managed_routing_policy_rules(link));
1022
1023 return r;
1024 }
1025
1026 static void link_foreignize_config(Link *link) {
1027 assert(link);
1028 assert(link->manager);
1029
1030 link_foreignize_routes(link);
1031 link_foreignize_nexthops(link);
1032 link_foreignize_addresses(link);
1033 link_foreignize_neighbors(link);
1034 link_foreignize_routing_policy_rules(link);
1035 }
1036
1037 static int link_configure(Link *link) {
1038 int r;
1039
1040 assert(link);
1041 assert(link->network);
1042 assert(link->state == LINK_STATE_INITIALIZED);
1043
1044 link_set_state(link, LINK_STATE_CONFIGURING);
1045
1046 r = link_new_bound_to_list(link);
1047 if (r < 0)
1048 return r;
1049
1050 r = link_request_traffic_control(link);
1051 if (r < 0)
1052 return r;
1053
1054 r = link_configure_mtu(link);
1055 if (r < 0)
1056 return r;
1057
1058 if (link->iftype == ARPHRD_CAN) {
1059 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1060 r = link_request_to_set_can(link);
1061 if (r < 0)
1062 return r;
1063
1064 return link_request_to_activate(link);
1065 }
1066
1067 r = link_request_sr_iov_vfs(link);
1068 if (r < 0)
1069 return r;
1070
1071 r = link_set_sysctl(link);
1072 if (r < 0)
1073 return r;
1074
1075 r = link_request_to_set_mac(link, /* allow_retry = */ true);
1076 if (r < 0)
1077 return r;
1078
1079 r = link_request_to_set_ipoib(link);
1080 if (r < 0)
1081 return r;
1082
1083 r = link_request_to_set_flags(link);
1084 if (r < 0)
1085 return r;
1086
1087 r = link_request_to_set_group(link);
1088 if (r < 0)
1089 return r;
1090
1091 r = link_request_to_set_addrgen_mode(link);
1092 if (r < 0)
1093 return r;
1094
1095 r = link_request_to_set_master(link);
1096 if (r < 0)
1097 return r;
1098
1099 r = link_request_stacked_netdevs(link);
1100 if (r < 0)
1101 return r;
1102
1103 r = link_request_to_set_bond(link);
1104 if (r < 0)
1105 return r;
1106
1107 r = link_request_to_set_bridge(link);
1108 if (r < 0)
1109 return r;
1110
1111 r = link_request_to_set_bridge_vlan(link);
1112 if (r < 0)
1113 return r;
1114
1115 r = link_request_to_activate(link);
1116 if (r < 0)
1117 return r;
1118
1119 r = ipv4ll_configure(link);
1120 if (r < 0)
1121 return r;
1122
1123 r = link_request_dhcp4_client(link);
1124 if (r < 0)
1125 return r;
1126
1127 r = link_request_dhcp6_client(link);
1128 if (r < 0)
1129 return r;
1130
1131 r = link_request_ndisc(link);
1132 if (r < 0)
1133 return r;
1134
1135 r = link_request_dhcp_server(link);
1136 if (r < 0)
1137 return r;
1138
1139 r = link_request_radv(link);
1140 if (r < 0)
1141 return r;
1142
1143 r = link_lldp_rx_configure(link);
1144 if (r < 0)
1145 return r;
1146
1147 r = link_lldp_tx_configure(link);
1148 if (r < 0)
1149 return r;
1150
1151 r = link_drop_foreign_config(link);
1152 if (r < 0)
1153 return r;
1154
1155 r = link_request_static_configs(link);
1156 if (r < 0)
1157 return r;
1158
1159 if (!link_has_carrier(link))
1160 return 0;
1161
1162 return link_acquire_dynamic_conf(link);
1163 }
1164
1165 static int link_get_network(Link *link, Network **ret) {
1166 Network *network;
1167 int r;
1168
1169 assert(link);
1170 assert(link->manager);
1171 assert(ret);
1172
1173 ORDERED_HASHMAP_FOREACH(network, link->manager->networks) {
1174 bool warn = false;
1175
1176 r = net_match_config(
1177 &network->match,
1178 link->dev,
1179 &link->hw_addr,
1180 &link->permanent_hw_addr,
1181 link->driver,
1182 link->iftype,
1183 link->kind,
1184 link->ifname,
1185 link->alternative_names,
1186 link->wlan_iftype,
1187 link->ssid,
1188 &link->bssid);
1189 if (r < 0)
1190 return r;
1191 if (r == 0)
1192 continue;
1193
1194 if (network->match.ifname && link->dev) {
1195 uint8_t name_assign_type = NET_NAME_UNKNOWN;
1196 const char *attr;
1197
1198 if (sd_device_get_sysattr_value(link->dev, "name_assign_type", &attr) >= 0)
1199 (void) safe_atou8(attr, &name_assign_type);
1200
1201 warn = name_assign_type == NET_NAME_ENUM;
1202 }
1203
1204 log_link_full(link, warn ? LOG_WARNING : LOG_DEBUG,
1205 "found matching network '%s'%s.",
1206 network->filename,
1207 warn ? ", based on potentially unpredictable interface name" : "");
1208
1209 if (network->unmanaged)
1210 return -ENOENT;
1211
1212 *ret = network;
1213 return 0;
1214 }
1215
1216 return -ENOENT;
1217 }
1218
1219 int link_reconfigure_impl(Link *link, bool force) {
1220 Network *network = NULL;
1221 NetDev *netdev = NULL;
1222 int r;
1223
1224 assert(link);
1225
1226 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
1227 return 0;
1228
1229 r = netdev_get(link->manager, link->ifname, &netdev);
1230 if (r < 0 && r != -ENOENT)
1231 return r;
1232
1233 r = link_get_network(link, &network);
1234 if (r < 0 && r != -ENOENT)
1235 return r;
1236
1237 if (link->state != LINK_STATE_UNMANAGED && !network)
1238 /* If link is in initialized state, then link->network is also NULL. */
1239 force = true;
1240
1241 if (link->network == network && !force)
1242 return 0;
1243
1244 if (network) {
1245 if (link->state == LINK_STATE_INITIALIZED)
1246 log_link_info(link, "Configuring with %s.", network->filename);
1247 else
1248 log_link_info(link, "Reconfiguring with %s.", network->filename);
1249 } else
1250 log_link_full(link, link->state == LINK_STATE_INITIALIZED ? LOG_DEBUG : LOG_INFO,
1251 "Unmanaging interface.");
1252
1253 /* Dropping old .network file */
1254 r = link_stop_engines(link, false);
1255 if (r < 0)
1256 return r;
1257
1258 link_drop_requests(link);
1259
1260 if (network && !force && network->keep_configuration != KEEP_CONFIGURATION_YES)
1261 /* When a new/updated .network file is assigned, first make all configs (addresses,
1262 * routes, and so on) foreign, and then drop unnecessary configs later by
1263 * link_drop_foreign_config() in link_configure().
1264 * Note, when KeepConfiguration=yes, link_drop_foreign_config() does nothing. Hence,
1265 * here we need to drop the configs such as addresses, routes, and so on configured by
1266 * the previously assigned .network file. */
1267 link_foreignize_config(link);
1268 else {
1269 /* Remove all managed configs. Note, foreign configs are removed in later by
1270 * link_configure() -> link_drop_foreign_config() if the link is managed by us. */
1271 r = link_drop_managed_config(link);
1272 if (r < 0)
1273 return r;
1274 }
1275
1276 /* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the
1277 * bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will
1278 * not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the
1279 * map here, as it depends on .network files assigned to other links. */
1280 link_free_bound_to_list(link);
1281
1282 link_free_engines(link);
1283 link->network = network_unref(link->network);
1284
1285 netdev_unref(link->netdev);
1286 link->netdev = netdev_ref(netdev);
1287
1288 if (!network) {
1289 link_set_state(link, LINK_STATE_UNMANAGED);
1290 return 0;
1291 }
1292
1293 /* Then, apply new .network file */
1294 link->network = network_ref(network);
1295 link_update_operstate(link, true);
1296 link_dirty(link);
1297
1298 link_set_state(link, LINK_STATE_INITIALIZED);
1299 link->activated = false;
1300
1301 r = link_configure(link);
1302 if (r < 0)
1303 return r;
1304
1305 return 1;
1306 }
1307
1308 static int link_reconfigure_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, bool force) {
1309 int r;
1310
1311 assert(link);
1312
1313 r = link_getlink_handler_internal(rtnl, m, link, "Failed to update link state");
1314 if (r <= 0)
1315 return r;
1316
1317 r = link_reconfigure_impl(link, force);
1318 if (r < 0) {
1319 link_enter_failed(link);
1320 return 0;
1321 }
1322
1323 return r;
1324 }
1325
1326 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1327 return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ false);
1328 }
1329
1330 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1331 return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ true);
1332 }
1333
1334 int link_reconfigure(Link *link, bool force) {
1335 int r;
1336
1337 assert(link);
1338
1339 /* When link in pending or initialized state, then link_configure() will be called. To prevent
1340 * the function from being called multiple times simultaneously, refuse to reconfigure the
1341 * interface in these cases. */
1342 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
1343 return 0; /* 0 means no-op. */
1344
1345 r = link_call_getlink(link, force ? link_force_reconfigure_handler : link_reconfigure_handler);
1346 if (r < 0)
1347 return r;
1348
1349 return 1; /* 1 means the interface will be reconfigured. */
1350 }
1351
1352 static int link_initialized_and_synced(Link *link) {
1353 int r;
1354
1355 assert(link);
1356 assert(link->manager);
1357
1358 if (link->manager->test_mode) {
1359 log_link_debug(link, "Running in test mode, refusing to enter initialized state.");
1360 link_set_state(link, LINK_STATE_UNMANAGED);
1361 return 0;
1362 }
1363
1364 if (link->state == LINK_STATE_PENDING) {
1365 log_link_debug(link, "Link state is up-to-date");
1366 link_set_state(link, LINK_STATE_INITIALIZED);
1367
1368 r = link_new_bound_by_list(link);
1369 if (r < 0)
1370 return r;
1371
1372 r = link_handle_bound_by_list(link);
1373 if (r < 0)
1374 return r;
1375 }
1376
1377 return link_reconfigure_impl(link, /* force = */ false);
1378 }
1379
1380 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1381 int r;
1382
1383 r = link_getlink_handler_internal(rtnl, m, link, "Failed to wait for the interface to be initialized");
1384 if (r <= 0)
1385 return r;
1386
1387 r = link_initialized_and_synced(link);
1388 if (r < 0)
1389 link_enter_failed(link);
1390
1391 return 0;
1392 }
1393
1394 static int link_initialized(Link *link, sd_device *device) {
1395 int r;
1396
1397 assert(link);
1398 assert(device);
1399
1400 /* Always replace with the new sd_device object. As the sysname (and possibly other properties
1401 * or sysattrs) may be outdated. */
1402 device_unref_and_replace(link->dev, device);
1403
1404 if (link->dhcp_client) {
1405 r = sd_dhcp_client_attach_device(link->dhcp_client, link->dev);
1406 if (r < 0)
1407 log_link_warning_errno(link, r, "Failed to attach device to DHCPv4 client, ignoring: %m");
1408 }
1409
1410 if (link->dhcp6_client) {
1411 r = sd_dhcp6_client_attach_device(link->dhcp6_client, link->dev);
1412 if (r < 0)
1413 log_link_warning_errno(link, r, "Failed to attach device to DHCPv6 client, ignoring: %m");
1414 }
1415
1416 r = link_set_sr_iov_ifindices(link);
1417 if (r < 0)
1418 log_link_warning_errno(link, r, "Failed to manage SR-IOV PF and VF ports, ignoring: %m");
1419
1420 if (link->state != LINK_STATE_PENDING)
1421 return link_reconfigure(link, /* force = */ false);
1422
1423 log_link_debug(link, "udev initialized link");
1424
1425 /* udev has initialized the link, but we don't know if we have yet
1426 * processed the NEWLINK messages with the latest state. Do a GETLINK,
1427 * when it returns we know that the pending NEWLINKs have already been
1428 * processed and that we are up-to-date */
1429
1430 return link_call_getlink(link, link_initialized_handler);
1431 }
1432
1433 static int link_check_initialized(Link *link) {
1434 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
1435 int r;
1436
1437 assert(link);
1438
1439 if (!udev_available())
1440 return link_initialized_and_synced(link);
1441
1442 /* udev should be around */
1443 r = sd_device_new_from_ifindex(&device, link->ifindex);
1444 if (r < 0) {
1445 log_link_debug_errno(link, r, "Could not find device, waiting for device initialization: %m");
1446 return 0;
1447 }
1448
1449 r = sd_device_get_is_initialized(device);
1450 if (r < 0)
1451 return log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
1452 if (r == 0) {
1453 /* not yet ready */
1454 log_link_debug(link, "link pending udev initialization...");
1455 return 0;
1456 }
1457
1458 r = device_is_renaming(device);
1459 if (r < 0)
1460 return log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
1461 if (r > 0) {
1462 log_link_debug(link, "Interface is being renamed, pending initialization.");
1463 return 0;
1464 }
1465
1466 return link_initialized(link, device);
1467 }
1468
1469 int manager_udev_process_link(Manager *m, sd_device *device, sd_device_action_t action) {
1470 int r, ifindex;
1471 const char *s;
1472 Link *link;
1473
1474 assert(m);
1475 assert(device);
1476
1477 r = sd_device_get_ifindex(device, &ifindex);
1478 if (r < 0)
1479 return log_device_debug_errno(device, r, "Failed to get ifindex: %m");
1480
1481 r = link_get_by_index(m, ifindex, &link);
1482 if (r < 0) {
1483 /* This error is not critical, as the corresponding rtnl message may be received later. */
1484 log_device_debug_errno(device, r, "Failed to get link from ifindex %i, ignoring: %m", ifindex);
1485 return 0;
1486 }
1487
1488 /* Let's unref the sd-device object assigned to the corresponding Link object, but keep the Link
1489 * object here. It will be removed only when rtnetlink says so. */
1490 if (action == SD_DEVICE_REMOVE) {
1491 link->dev = sd_device_unref(link->dev);
1492 return 0;
1493 }
1494
1495 r = device_is_renaming(device);
1496 if (r < 0)
1497 return log_device_debug_errno(device, r, "Failed to determine if the device is renaming or not: %m");
1498 if (r > 0) {
1499 log_device_debug(device, "Device is renaming, waiting for the interface to be renamed.");
1500 /* TODO:
1501 * What happens when a device is initialized, then soon renamed after that? When we detect
1502 * such, maybe we should cancel or postpone all queued requests for the interface. */
1503 return 0;
1504 }
1505
1506 r = sd_device_get_property_value(device, "ID_NET_MANAGED_BY", &s);
1507 if (r < 0 && r != -ENOENT)
1508 log_device_debug_errno(device, r, "Failed to get ID_NET_MANAGED_BY udev property, ignoring: %m");
1509 if (r >= 0 && !streq(s, "io.systemd.Network")) {
1510 log_device_debug(device, "Interface is requested to be managed by '%s', not managing the interface.", s);
1511 link_set_state(link, LINK_STATE_UNMANAGED);
1512 return 0;
1513 }
1514
1515 r = link_initialized(link, device);
1516 if (r < 0)
1517 link_enter_failed(link);
1518
1519 return 0;
1520 }
1521
1522 static int link_carrier_gained(Link *link) {
1523 bool force_reconfigure;
1524 int r;
1525
1526 assert(link);
1527
1528 r = event_source_disable(link->carrier_lost_timer);
1529 if (r < 0)
1530 log_link_warning_errno(link, r, "Failed to disable carrier lost timer, ignoring: %m");
1531
1532 /* If a wireless interface was connected to an access point, and the SSID is changed (that is,
1533 * both previous_ssid and ssid are non-NULL), then the connected wireless network could be
1534 * changed. So, always reconfigure the link. Which means e.g. the DHCP client will be
1535 * restarted, and the correct network information will be gained.
1536 *
1537 * However, do not reconfigure the wireless interface forcibly if it was not connected to any
1538 * access points previously (previous_ssid is NULL in this case). As, a .network file may be
1539 * already assigned to the interface (in that case, the .network file does not have the SSID=
1540 * setting in the [Match] section), and the interface is already being configured. Of course,
1541 * there may exist another .network file with higher priority and a matching SSID= setting. But
1542 * in that case, link_reconfigure_impl() can handle that without the force_reconfigure flag.
1543 *
1544 * For non-wireless interfaces, we have no way to detect the connected network change. So,
1545 * setting force_reconfigure = false. Note, both ssid and previous_ssid are NULL in that case. */
1546 force_reconfigure = link->previous_ssid && !streq_ptr(link->previous_ssid, link->ssid);
1547 link->previous_ssid = mfree(link->previous_ssid);
1548
1549 /* AP and P2P-GO interfaces may have a new SSID - update the link properties in case a new .network
1550 * profile wants to match on it with SSID= in its [Match] section.
1551 */
1552 if (IN_SET(link->wlan_iftype, NL80211_IFTYPE_AP, NL80211_IFTYPE_P2P_GO)) {
1553 r = link_get_wlan_interface(link);
1554 if (r < 0)
1555 return r;
1556 }
1557
1558 /* At this stage, both wlan and link information should be up-to-date. Hence, it is not necessary to
1559 * call RTM_GETLINK, NL80211_CMD_GET_INTERFACE, or NL80211_CMD_GET_STATION commands, and simply call
1560 * link_reconfigure_impl(). Note, link_reconfigure_impl() returns 1 when the link is reconfigured. */
1561 r = link_reconfigure_impl(link, force_reconfigure);
1562 if (r != 0)
1563 return r;
1564
1565 r = link_handle_bound_by_list(link);
1566 if (r < 0)
1567 return r;
1568
1569 if (link->iftype == ARPHRD_CAN)
1570 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1571 return 0;
1572
1573 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
1574 r = link_acquire_dynamic_conf(link);
1575 if (r < 0)
1576 return r;
1577
1578 r = link_request_static_configs(link);
1579 if (r < 0)
1580 return r;
1581 }
1582
1583 return 0;
1584 }
1585
1586 static int link_carrier_lost_impl(Link *link) {
1587 int r, ret = 0;
1588
1589 assert(link);
1590
1591 link->previous_ssid = mfree(link->previous_ssid);
1592
1593 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1594 return 0;
1595
1596 if (!link->network)
1597 return 0;
1598
1599 r = link_stop_engines(link, false);
1600 if (r < 0)
1601 ret = r;
1602
1603 r = link_drop_managed_config(link);
1604 if (r < 0 && ret >= 0)
1605 ret = r;
1606
1607 return ret;
1608 }
1609
1610 static int link_carrier_lost_handler(sd_event_source *s, uint64_t usec, void *userdata) {
1611 Link *link = ASSERT_PTR(userdata);
1612 int r;
1613
1614 r = link_carrier_lost_impl(link);
1615 if (r < 0) {
1616 log_link_warning_errno(link, r, "Failed to process carrier lost event: %m");
1617 link_enter_failed(link);
1618 }
1619
1620 return 0;
1621 }
1622
1623 static int link_carrier_lost(Link *link) {
1624 uint16_t dhcp_mtu;
1625 usec_t usec;
1626 int r;
1627
1628 assert(link);
1629
1630 r = link_handle_bound_by_list(link);
1631 if (r < 0)
1632 return r;
1633
1634 if (link->iftype == ARPHRD_CAN)
1635 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1636 return 0;
1637
1638 if (!link->network)
1639 return 0;
1640
1641 if (link->network->ignore_carrier_loss_set)
1642 /* If IgnoreCarrierLoss= is explicitly specified, then use the specified value. */
1643 usec = link->network->ignore_carrier_loss_usec;
1644
1645 else if (link->network->bond && link->wlan_iftype > 0)
1646 /* Enslaving wlan interface to a bond disconnects from the connected AP, and causes its
1647 * carrier to be lost. See #19832. */
1648 usec = 3 * USEC_PER_SEC;
1649
1650 else if (link->network->dhcp_use_mtu &&
1651 link->dhcp_lease &&
1652 sd_dhcp_lease_get_mtu(link->dhcp_lease, &dhcp_mtu) >= 0 &&
1653 dhcp_mtu != link->original_mtu)
1654 /* Some drivers reset interfaces when changing MTU. Resetting interfaces by the static
1655 * MTU should not cause any issues, as MTU is changed only once. However, setting MTU
1656 * through DHCP lease causes an infinite loop of resetting the interface. See #18738. */
1657 usec = 5 * USEC_PER_SEC;
1658
1659 else
1660 /* Otherwise, use the currently set value. */
1661 usec = link->network->ignore_carrier_loss_usec;
1662
1663 if (usec == USEC_INFINITY)
1664 return 0;
1665
1666 if (usec == 0)
1667 return link_carrier_lost_impl(link);
1668
1669 return event_reset_time_relative(link->manager->event,
1670 &link->carrier_lost_timer,
1671 CLOCK_BOOTTIME,
1672 usec,
1673 0,
1674 link_carrier_lost_handler,
1675 link,
1676 0,
1677 "link-carrier-loss",
1678 true);
1679 }
1680
1681 static int link_admin_state_up(Link *link) {
1682 int r;
1683
1684 assert(link);
1685
1686 /* This is called every time an interface admin state changes to up;
1687 * specifically, when IFF_UP flag changes from unset to set. */
1688
1689 if (!link->network)
1690 return 0;
1691
1692 if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_DOWN) {
1693 log_link_info(link, "Activation policy is \"always-down\", forcing link down.");
1694 return link_request_to_bring_up_or_down(link, /* up = */ false);
1695 }
1696
1697 /* We set the ipv6 mtu after the device mtu, but the kernel resets
1698 * ipv6 mtu on NETDEV_UP, so we need to reset it. */
1699 r = link_set_ipv6_mtu(link);
1700 if (r < 0)
1701 log_link_warning_errno(link, r, "Cannot set IPv6 MTU, ignoring: %m");
1702
1703 return 0;
1704 }
1705
1706 static int link_admin_state_down(Link *link) {
1707 assert(link);
1708
1709 if (!link->network)
1710 return 0;
1711
1712 if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) {
1713 log_link_info(link, "Activation policy is \"always-up\", forcing link up.");
1714 return link_request_to_bring_up_or_down(link, /* up = */ true);
1715 }
1716
1717 return 0;
1718 }
1719
1720 static bool link_is_enslaved(Link *link) {
1721 if (link->flags & IFF_SLAVE)
1722 return true;
1723
1724 if (link->master_ifindex > 0)
1725 return true;
1726
1727 return false;
1728 }
1729
1730 void link_update_operstate(Link *link, bool also_update_master) {
1731 LinkOperationalState operstate;
1732 LinkCarrierState carrier_state;
1733 LinkAddressState ipv4_address_state, ipv6_address_state, address_state;
1734 LinkOnlineState online_state;
1735 _cleanup_strv_free_ char **p = NULL;
1736 bool changed = false;
1737
1738 assert(link);
1739
1740 if (link->kernel_operstate == IF_OPER_DORMANT)
1741 carrier_state = LINK_CARRIER_STATE_DORMANT;
1742 else if (link_has_carrier(link)) {
1743 if (link_is_enslaved(link))
1744 carrier_state = LINK_CARRIER_STATE_ENSLAVED;
1745 else
1746 carrier_state = LINK_CARRIER_STATE_CARRIER;
1747 } else if (link->flags & IFF_UP)
1748 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
1749 else
1750 carrier_state = LINK_CARRIER_STATE_OFF;
1751
1752 if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
1753 Link *slave;
1754
1755 SET_FOREACH(slave, link->slaves) {
1756 link_update_operstate(slave, false);
1757
1758 if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
1759 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
1760 }
1761 }
1762
1763 link_get_address_states(link, &ipv4_address_state, &ipv6_address_state, &address_state);
1764
1765 /* Mapping of address and carrier state vs operational state
1766 * carrier state
1767 * | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
1768 * ------------------------------------------------------------------------------
1769 * off | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
1770 * address_state degraded | off | no-carrier | dormant | degraded | degraded | enslaved
1771 * routable | off | no-carrier | dormant | routable | routable | routable
1772 */
1773
1774 if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_ROUTABLE)
1775 operstate = LINK_OPERSTATE_ROUTABLE;
1776 else if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_DEGRADED)
1777 operstate = LINK_OPERSTATE_DEGRADED;
1778 else if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
1779 operstate = (LinkOperationalState) carrier_state;
1780 else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
1781 operstate = LINK_OPERSTATE_ROUTABLE;
1782 else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
1783 operstate = LINK_OPERSTATE_DEGRADED;
1784 else
1785 operstate = LINK_OPERSTATE_ENSLAVED;
1786
1787 /* Only determine online state for managed links with RequiredForOnline=yes */
1788 if (!link->network || !link->network->required_for_online)
1789 online_state = _LINK_ONLINE_STATE_INVALID;
1790 else if (operstate < link->network->required_operstate_for_online.min ||
1791 operstate > link->network->required_operstate_for_online.max)
1792 online_state = LINK_ONLINE_STATE_OFFLINE;
1793 else {
1794 AddressFamily required_family = link->network->required_family_for_online;
1795 bool needs_ipv4 = required_family & ADDRESS_FAMILY_IPV4;
1796 bool needs_ipv6 = required_family & ADDRESS_FAMILY_IPV6;
1797
1798 /* The operational state is within the range required for online.
1799 * If a particular address family is also required, we might revert
1800 * to offline in the blocks below. */
1801 online_state = LINK_ONLINE_STATE_ONLINE;
1802
1803 if (link->network->required_operstate_for_online.min >= LINK_OPERSTATE_DEGRADED) {
1804 if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_DEGRADED)
1805 online_state = LINK_ONLINE_STATE_OFFLINE;
1806 if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_DEGRADED)
1807 online_state = LINK_ONLINE_STATE_OFFLINE;
1808 }
1809
1810 if (link->network->required_operstate_for_online.min >= LINK_OPERSTATE_ROUTABLE) {
1811 if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1812 online_state = LINK_ONLINE_STATE_OFFLINE;
1813 if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1814 online_state = LINK_ONLINE_STATE_OFFLINE;
1815 }
1816 }
1817
1818 if (link->carrier_state != carrier_state) {
1819 link->carrier_state = carrier_state;
1820 changed = true;
1821 if (strv_extend(&p, "CarrierState") < 0)
1822 log_oom();
1823 }
1824
1825 if (link->address_state != address_state) {
1826 link->address_state = address_state;
1827 changed = true;
1828 if (strv_extend(&p, "AddressState") < 0)
1829 log_oom();
1830 }
1831
1832 if (link->ipv4_address_state != ipv4_address_state) {
1833 link->ipv4_address_state = ipv4_address_state;
1834 changed = true;
1835 if (strv_extend(&p, "IPv4AddressState") < 0)
1836 log_oom();
1837 }
1838
1839 if (link->ipv6_address_state != ipv6_address_state) {
1840 link->ipv6_address_state = ipv6_address_state;
1841 changed = true;
1842 if (strv_extend(&p, "IPv6AddressState") < 0)
1843 log_oom();
1844 }
1845
1846 if (link->operstate != operstate) {
1847 link->operstate = operstate;
1848 changed = true;
1849 if (strv_extend(&p, "OperationalState") < 0)
1850 log_oom();
1851 }
1852
1853 if (link->online_state != online_state) {
1854 link->online_state = online_state;
1855 changed = true;
1856 if (strv_extend(&p, "OnlineState") < 0)
1857 log_oom();
1858 }
1859
1860 if (p)
1861 link_send_changed_strv(link, p);
1862 if (changed)
1863 link_dirty(link);
1864
1865 if (also_update_master) {
1866 Link *master;
1867
1868 if (link_get_master(link, &master) >= 0)
1869 link_update_operstate(master, true);
1870 }
1871 }
1872
1873 #define FLAG_STRING(string, flag, old, new) \
1874 (((old ^ new) & flag) \
1875 ? ((old & flag) ? (" -" string) : (" +" string)) \
1876 : "")
1877
1878 static int link_update_flags(Link *link, sd_netlink_message *message) {
1879 bool link_was_admin_up, had_carrier;
1880 uint8_t operstate;
1881 unsigned flags;
1882 int r;
1883
1884 assert(link);
1885 assert(message);
1886
1887 r = sd_rtnl_message_link_get_flags(message, &flags);
1888 if (r < 0)
1889 return log_link_debug_errno(link, r, "rtnl: failed to read link flags: %m");
1890
1891 r = sd_netlink_message_read_u8(message, IFLA_OPERSTATE, &operstate);
1892 if (r == -ENODATA)
1893 /* If we got a message without operstate, assume the state was unchanged. */
1894 operstate = link->kernel_operstate;
1895 else if (r < 0)
1896 return log_link_debug_errno(link, r, "rtnl: failed to read operational state: %m");
1897
1898 if (link->flags == flags && link->kernel_operstate == operstate)
1899 return 0;
1900
1901 if (link->flags != flags) {
1902 unsigned unknown_flags, unknown_flags_added, unknown_flags_removed;
1903
1904 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",
1905 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
1906 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
1907 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
1908 FLAG_STRING("UP", IFF_UP, link->flags, flags),
1909 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
1910 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
1911 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
1912 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
1913 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
1914 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
1915 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
1916 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
1917 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
1918 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
1919 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
1920 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
1921 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
1922 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
1923 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
1924
1925 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
1926 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
1927 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
1928 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
1929 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
1930 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
1931 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
1932 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
1933
1934 if (unknown_flags_added)
1935 log_link_debug(link, "Unknown link flags gained, ignoring: %#.5x", unknown_flags_added);
1936
1937 if (unknown_flags_removed)
1938 log_link_debug(link, "Unknown link flags lost, ignoring: %#.5x", unknown_flags_removed);
1939 }
1940
1941 link_was_admin_up = link->flags & IFF_UP;
1942 had_carrier = link_has_carrier(link);
1943
1944 link->flags = flags;
1945 link->kernel_operstate = operstate;
1946
1947 link_update_operstate(link, true);
1948
1949 if (!link_was_admin_up && (link->flags & IFF_UP)) {
1950 log_link_info(link, "Link UP");
1951
1952 r = link_admin_state_up(link);
1953 if (r < 0)
1954 return r;
1955 } else if (link_was_admin_up && !(link->flags & IFF_UP)) {
1956 log_link_info(link, "Link DOWN");
1957
1958 r = link_admin_state_down(link);
1959 if (r < 0)
1960 return r;
1961 }
1962
1963 if (!had_carrier && link_has_carrier(link)) {
1964 log_link_info(link, "Gained carrier");
1965
1966 r = link_carrier_gained(link);
1967 if (r < 0)
1968 return r;
1969 } else if (had_carrier && !link_has_carrier(link)) {
1970 log_link_info(link, "Lost carrier");
1971
1972 r = link_carrier_lost(link);
1973 if (r < 0)
1974 return r;
1975 }
1976
1977 return 0;
1978 }
1979
1980 static int link_update_master(Link *link, sd_netlink_message *message) {
1981 int master_ifindex, r;
1982
1983 assert(link);
1984 assert(message);
1985
1986 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t*) &master_ifindex);
1987 if (r == -ENODATA)
1988 return 0;
1989 if (r < 0)
1990 return log_link_debug_errno(link, r, "rtnl: failed to read master ifindex: %m");
1991
1992 if (master_ifindex == link->ifindex)
1993 master_ifindex = 0;
1994
1995 if (master_ifindex == link->master_ifindex)
1996 return 0;
1997
1998 if (link->master_ifindex == 0)
1999 log_link_debug(link, "Attached to master interface: %i", master_ifindex);
2000 else if (master_ifindex == 0)
2001 log_link_debug(link, "Detached from master interface: %i", link->master_ifindex);
2002 else
2003 log_link_debug(link, "Master interface changed: %i %s %i", link->master_ifindex,
2004 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), master_ifindex);
2005
2006 link_drop_from_master(link);
2007
2008 link->master_ifindex = master_ifindex;
2009
2010 r = link_append_to_master(link);
2011 if (r < 0)
2012 return log_link_debug_errno(link, r, "Failed to append link to master: %m");
2013
2014 return 0;
2015 }
2016
2017 static int link_update_driver(Link *link, sd_netlink_message *message) {
2018 int r;
2019
2020 assert(link);
2021 assert(link->manager);
2022 assert(message);
2023
2024 /* Driver is already read. Assuming the driver is never changed. */
2025 if (link->ethtool_driver_read)
2026 return 0;
2027
2028 /* When udevd is running, read the driver after the interface is initialized by udevd.
2029 * Otherwise, ethtool may not work correctly. See issue #22538.
2030 * When udevd is not running, read the value when the interface is detected. */
2031 if (udev_available() && !link->dev)
2032 return 0;
2033
2034 link->ethtool_driver_read = true;
2035
2036 r = ethtool_get_driver(&link->manager->ethtool_fd, link->ifname, &link->driver);
2037 if (r < 0) {
2038 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
2039 return 0;
2040 }
2041
2042 log_link_debug(link, "Found driver: %s", strna(link->driver));
2043
2044 if (streq_ptr(link->driver, "dsa")) {
2045 uint32_t dsa_master_ifindex = 0;
2046
2047 r = sd_netlink_message_read_u32(message, IFLA_LINK, &dsa_master_ifindex);
2048 if (r < 0 && r != -ENODATA)
2049 return log_link_debug_errno(link, r, "rtnl: failed to read ifindex of the DSA master interface: %m");
2050
2051 if (dsa_master_ifindex > INT_MAX) {
2052 log_link_debug(link, "rtnl: received too large DSA master ifindex (%"PRIu32" > INT_MAX), ignoring.",
2053 dsa_master_ifindex);
2054 dsa_master_ifindex = 0;
2055 }
2056
2057 link->dsa_master_ifindex = (int) dsa_master_ifindex;
2058 }
2059
2060 return 1; /* needs reconfigure */
2061 }
2062
2063 static int link_update_permanent_hardware_address_from_ethtool(Link *link, sd_netlink_message *message) {
2064 int r;
2065
2066 assert(link);
2067 assert(link->manager);
2068 assert(message);
2069
2070 if (link->ethtool_permanent_hw_addr_read)
2071 return 0;
2072
2073 /* When udevd is running, read the permanent hardware address after the interface is
2074 * initialized by udevd. Otherwise, ethtool may not work correctly. See issue #22538.
2075 * When udevd is not running, read the value when the interface is detected. */
2076 if (udev_available() && !link->dev)
2077 return 0;
2078
2079 /* If the interface does not have a hardware address, then it will not have a permanent address either. */
2080 r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, NULL);
2081 if (r == -ENODATA)
2082 return 0;
2083 if (r < 0)
2084 return log_link_debug_errno(link, r, "Failed to read IFLA_ADDRESS attribute: %m");
2085
2086 link->ethtool_permanent_hw_addr_read = true;
2087
2088 r = ethtool_get_permanent_hw_addr(&link->manager->ethtool_fd, link->ifname, &link->permanent_hw_addr);
2089 if (r < 0)
2090 log_link_debug_errno(link, r, "Permanent hardware address not found, continuing without: %m");
2091
2092 return 0;
2093 }
2094
2095 static int link_update_permanent_hardware_address(Link *link, sd_netlink_message *message) {
2096 int r;
2097
2098 assert(link);
2099 assert(link->manager);
2100 assert(message);
2101
2102 if (link->permanent_hw_addr.length > 0)
2103 return 0;
2104
2105 r = netlink_message_read_hw_addr(message, IFLA_PERM_ADDRESS, &link->permanent_hw_addr);
2106 if (r < 0) {
2107 if (r != -ENODATA)
2108 return log_link_debug_errno(link, r, "Failed to read IFLA_PERM_ADDRESS attribute: %m");
2109
2110 /* Fallback to ethtool for older kernels. */
2111 r = link_update_permanent_hardware_address_from_ethtool(link, message);
2112 if (r < 0)
2113 return r;
2114 }
2115
2116 if (link->permanent_hw_addr.length > 0)
2117 log_link_debug(link, "Saved permanent hardware address: %s", HW_ADDR_TO_STR(&link->permanent_hw_addr));
2118
2119 return 1; /* needs reconfigure */
2120 }
2121
2122 static int link_update_hardware_address(Link *link, sd_netlink_message *message) {
2123 struct hw_addr_data addr;
2124 int r;
2125
2126 assert(link);
2127 assert(message);
2128
2129 r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr);
2130 if (r < 0 && r != -ENODATA)
2131 return log_link_debug_errno(link, r, "rtnl: failed to read broadcast address: %m");
2132
2133 r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &addr);
2134 if (r == -ENODATA)
2135 return 0;
2136 if (r < 0)
2137 return log_link_debug_errno(link, r, "rtnl: failed to read hardware address: %m");
2138
2139 if (hw_addr_equal(&link->hw_addr, &addr))
2140 return 0;
2141
2142 if (link->hw_addr.length == 0)
2143 log_link_debug(link, "Saved hardware address: %s", HW_ADDR_TO_STR(&addr));
2144 else {
2145 log_link_debug(link, "Hardware address is changed: %s %s %s",
2146 HW_ADDR_TO_STR(&link->hw_addr),
2147 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT),
2148 HW_ADDR_TO_STR(&addr));
2149
2150 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
2151 }
2152
2153 link->hw_addr = addr;
2154
2155 if (!hw_addr_is_null(&link->hw_addr)) {
2156 r = hashmap_ensure_put(&link->manager->links_by_hw_addr, &hw_addr_hash_ops, &link->hw_addr, link);
2157 if (r == -EEXIST && streq_ptr(link->kind, "bond"))
2158 /* bonding master and its slaves have the same hardware address. */
2159 r = hashmap_replace(link->manager->links_by_hw_addr, &link->hw_addr, link);
2160 if (r < 0)
2161 log_link_debug_errno(link, r, "Failed to manage link by its new hardware address, ignoring: %m");
2162 }
2163
2164 r = ipv4acd_update_mac(link);
2165 if (r < 0)
2166 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m");
2167
2168 r = ipv4ll_update_mac(link);
2169 if (r < 0)
2170 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
2171
2172 r = dhcp4_update_mac(link);
2173 if (r < 0)
2174 return log_link_debug_errno(link, r, "Could not update MAC address in DHCP client: %m");
2175
2176 r = dhcp6_update_mac(link);
2177 if (r < 0)
2178 return log_link_debug_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
2179
2180 r = radv_update_mac(link);
2181 if (r < 0)
2182 return log_link_debug_errno(link, r, "Could not update MAC address for Router Advertisement: %m");
2183
2184 if (link->ndisc && link->hw_addr.length == ETH_ALEN) {
2185 r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether);
2186 if (r < 0)
2187 return log_link_debug_errno(link, r, "Could not update MAC for NDisc: %m");
2188 }
2189
2190 if (link->lldp_rx) {
2191 r = sd_lldp_rx_set_filter_address(link->lldp_rx, &link->hw_addr.ether);
2192 if (r < 0)
2193 return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Rx: %m");
2194 }
2195
2196 if (link->lldp_tx) {
2197 r = sd_lldp_tx_set_hwaddr(link->lldp_tx, &link->hw_addr.ether);
2198 if (r < 0)
2199 return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Tx: %m");
2200 }
2201
2202 return 1; /* needs reconfigure */
2203 }
2204
2205 static int link_update_mtu(Link *link, sd_netlink_message *message) {
2206 uint32_t mtu, min_mtu = 0, max_mtu = UINT32_MAX;
2207 int r;
2208
2209 assert(link);
2210 assert(message);
2211
2212 r = sd_netlink_message_read_u32(message, IFLA_MTU, &mtu);
2213 if (r == -ENODATA)
2214 return 0;
2215 if (r < 0)
2216 return log_link_debug_errno(link, r, "rtnl: failed to read MTU in RTM_NEWLINK message: %m");
2217 if (mtu == 0)
2218 return 0;
2219
2220 r = sd_netlink_message_read_u32(message, IFLA_MIN_MTU, &min_mtu);
2221 if (r < 0 && r != -ENODATA)
2222 return log_link_debug_errno(link, r, "rtnl: failed to read minimum MTU in RTM_NEWLINK message: %m");
2223
2224 r = sd_netlink_message_read_u32(message, IFLA_MAX_MTU, &max_mtu);
2225 if (r < 0 && r != -ENODATA)
2226 return log_link_debug_errno(link, r, "rtnl: failed to read maximum MTU in RTM_NEWLINK message: %m");
2227
2228 if (max_mtu == 0)
2229 max_mtu = UINT32_MAX;
2230
2231 link->min_mtu = min_mtu;
2232 link->max_mtu = max_mtu;
2233
2234 if (link->original_mtu == 0) {
2235 link->original_mtu = mtu;
2236 log_link_debug(link, "Saved original MTU %" PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2237 link->original_mtu, link->min_mtu, link->max_mtu);
2238 }
2239
2240 if (link->mtu == mtu)
2241 return 0;
2242
2243 if (link->mtu != 0)
2244 log_link_debug(link, "MTU is changed: %"PRIu32" %s %"PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2245 link->mtu, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), mtu,
2246 link->min_mtu, link->max_mtu);
2247
2248 link->mtu = mtu;
2249
2250 if (link->dhcp_client) {
2251 r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
2252 if (r < 0)
2253 return log_link_debug_errno(link, r, "Could not update MTU in DHCP client: %m");
2254 }
2255
2256 if (link->radv) {
2257 r = sd_radv_set_mtu(link->radv, link->mtu);
2258 if (r < 0)
2259 return log_link_debug_errno(link, r, "Could not set MTU for Router Advertisement: %m");
2260 }
2261
2262 return 0;
2263 }
2264
2265 static int link_update_alternative_names(Link *link, sd_netlink_message *message) {
2266 _cleanup_strv_free_ char **altnames = NULL;
2267 int r;
2268
2269 assert(link);
2270 assert(message);
2271
2272 r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &altnames);
2273 if (r == -ENODATA)
2274 /* The message does not have IFLA_PROP_LIST container attribute. It does not mean the
2275 * interface has no alternative name. */
2276 return 0;
2277 if (r < 0)
2278 return log_link_debug_errno(link, r, "rtnl: failed to read alternative names: %m");
2279
2280 if (strv_equal(altnames, link->alternative_names))
2281 return 0;
2282
2283 STRV_FOREACH(n, link->alternative_names)
2284 hashmap_remove(link->manager->links_by_name, *n);
2285
2286 strv_free_and_replace(link->alternative_names, altnames);
2287
2288 STRV_FOREACH(n, link->alternative_names) {
2289 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, *n, link);
2290 if (r < 0)
2291 return log_link_debug_errno(link, r, "Failed to manage link by its new alternative names: %m");
2292 }
2293
2294 return 1; /* needs reconfigure */
2295 }
2296
2297 static int link_update_name(Link *link, sd_netlink_message *message) {
2298 char ifname_from_index[IF_NAMESIZE];
2299 const char *ifname;
2300 int r;
2301
2302 assert(link);
2303 assert(message);
2304
2305 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
2306 if (r == -ENODATA)
2307 /* Hmm?? But ok. */
2308 return 0;
2309 if (r < 0)
2310 return log_link_debug_errno(link, r, "Failed to read interface name in RTM_NEWLINK message: %m");
2311
2312 if (streq(ifname, link->ifname))
2313 return 0;
2314
2315 r = format_ifname(link->ifindex, ifname_from_index);
2316 if (r < 0)
2317 return log_link_debug_errno(link, r, "Could not get interface name for index %i.", link->ifindex);
2318
2319 if (!streq(ifname, ifname_from_index)) {
2320 log_link_debug(link, "New interface name '%s' received from the kernel does not correspond "
2321 "with the name currently configured on the actual interface '%s'. Ignoring.",
2322 ifname, ifname_from_index);
2323 return 0;
2324 }
2325
2326 log_link_info(link, "Interface name change detected, renamed to %s.", ifname);
2327
2328 hashmap_remove(link->manager->links_by_name, link->ifname);
2329
2330 r = free_and_strdup(&link->ifname, ifname);
2331 if (r < 0)
2332 return log_oom_debug();
2333
2334 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, link->ifname, link);
2335 if (r < 0)
2336 return log_link_debug_errno(link, r, "Failed to manage link by its new name: %m");
2337
2338 if (link->dhcp_client) {
2339 r = sd_dhcp_client_set_ifname(link->dhcp_client, link->ifname);
2340 if (r < 0)
2341 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP client: %m");
2342 }
2343
2344 if (link->dhcp6_client) {
2345 r = sd_dhcp6_client_set_ifname(link->dhcp6_client, link->ifname);
2346 if (r < 0)
2347 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP6 client: %m");
2348 }
2349
2350 if (link->ndisc) {
2351 r = sd_ndisc_set_ifname(link->ndisc, link->ifname);
2352 if (r < 0)
2353 return log_link_debug_errno(link, r, "Failed to update interface name in NDisc: %m");
2354 }
2355
2356 if (link->dhcp_server) {
2357 r = sd_dhcp_server_set_ifname(link->dhcp_server, link->ifname);
2358 if (r < 0)
2359 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP server: %m");
2360 }
2361
2362 if (link->radv) {
2363 r = sd_radv_set_ifname(link->radv, link->ifname);
2364 if (r < 0)
2365 return log_link_debug_errno(link, r, "Failed to update interface name in Router Advertisement: %m");
2366 }
2367
2368 if (link->lldp_rx) {
2369 r = sd_lldp_rx_set_ifname(link->lldp_rx, link->ifname);
2370 if (r < 0)
2371 return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Rx: %m");
2372 }
2373
2374 if (link->lldp_tx) {
2375 r = sd_lldp_tx_set_ifname(link->lldp_tx, link->ifname);
2376 if (r < 0)
2377 return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Tx: %m");
2378 }
2379
2380 if (link->ipv4ll) {
2381 r = sd_ipv4ll_set_ifname(link->ipv4ll, link->ifname);
2382 if (r < 0)
2383 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4LL client: %m");
2384 }
2385
2386 r = ipv4acd_set_ifname(link);
2387 if (r < 0)
2388 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4ACD client: %m");
2389
2390 return 1; /* needs reconfigure */
2391 }
2392
2393 static int link_update(Link *link, sd_netlink_message *message) {
2394 bool needs_reconfigure = false;
2395 int r;
2396
2397 assert(link);
2398 assert(message);
2399
2400 r = link_update_name(link, message);
2401 if (r < 0)
2402 return r;
2403 needs_reconfigure = needs_reconfigure || r > 0;
2404
2405 r = link_update_alternative_names(link, message);
2406 if (r < 0)
2407 return r;
2408 needs_reconfigure = needs_reconfigure || r > 0;
2409
2410 r = link_update_mtu(link, message);
2411 if (r < 0)
2412 return r;
2413
2414 r = link_update_driver(link, message);
2415 if (r < 0)
2416 return r;
2417 needs_reconfigure = needs_reconfigure || r > 0;
2418
2419 r = link_update_permanent_hardware_address(link, message);
2420 if (r < 0)
2421 return r;
2422 needs_reconfigure = needs_reconfigure || r > 0;
2423
2424 r = link_update_hardware_address(link, message);
2425 if (r < 0)
2426 return r;
2427 needs_reconfigure = needs_reconfigure || r > 0;
2428
2429 r = link_update_master(link, message);
2430 if (r < 0)
2431 return r;
2432
2433 r = link_update_ipv6ll_addrgen_mode(link, message);
2434 if (r < 0)
2435 return r;
2436
2437 r = link_update_flags(link, message);
2438 if (r < 0)
2439 return r;
2440
2441 r = link_update_bridge_vlan(link, message);
2442 if (r < 0)
2443 return r;
2444
2445 return needs_reconfigure;
2446 }
2447
2448 static Link *link_drop_or_unref(Link *link) {
2449 if (!link)
2450 return NULL;
2451 if (!link->manager)
2452 return link_unref(link);
2453 return link_drop(link);
2454 }
2455
2456 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_drop_or_unref);
2457
2458 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
2459 _cleanup_free_ char *ifname = NULL, *kind = NULL, *state_file = NULL, *lease_file = NULL, *lldp_file = NULL;
2460 _cleanup_(link_drop_or_unrefp) Link *link = NULL;
2461 unsigned short iftype;
2462 int r, ifindex;
2463
2464 assert(manager);
2465 assert(message);
2466 assert(ret);
2467
2468 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2469 if (r < 0)
2470 return log_debug_errno(r, "rtnl: failed to read ifindex from link message: %m");
2471 else if (ifindex <= 0)
2472 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "rtnl: received link message without valid ifindex.");
2473
2474 r = sd_rtnl_message_link_get_type(message, &iftype);
2475 if (r < 0)
2476 return log_debug_errno(r, "rtnl: failed to read interface type from link message: %m");
2477
2478 r = sd_netlink_message_read_string_strdup(message, IFLA_IFNAME, &ifname);
2479 if (r < 0)
2480 return log_debug_errno(r, "rtnl: failed to read interface name from link message: %m");
2481
2482 /* check for link kind */
2483 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
2484 if (r >= 0) {
2485 r = sd_netlink_message_read_string_strdup(message, IFLA_INFO_KIND, &kind);
2486 if (r < 0 && r != -ENODATA)
2487 return log_debug_errno(r, "rtnl: failed to read interface kind from link message: %m");
2488 r = sd_netlink_message_exit_container(message);
2489 if (r < 0)
2490 return log_debug_errno(r, "rtnl: failed to exit IFLA_LINKINFO container: %m");
2491 }
2492
2493 if (!manager->test_mode) {
2494 /* Do not update state files when running in test mode. */
2495 if (asprintf(&state_file, "/run/systemd/netif/links/%d", ifindex) < 0)
2496 return log_oom_debug();
2497
2498 if (asprintf(&lease_file, "/run/systemd/netif/leases/%d", ifindex) < 0)
2499 return log_oom_debug();
2500
2501 if (asprintf(&lldp_file, "/run/systemd/netif/lldp/%d", ifindex) < 0)
2502 return log_oom_debug();
2503 }
2504
2505 link = new(Link, 1);
2506 if (!link)
2507 return -ENOMEM;
2508
2509 *link = (Link) {
2510 .n_ref = 1,
2511 .state = LINK_STATE_PENDING,
2512 .online_state = _LINK_ONLINE_STATE_INVALID,
2513 .ifindex = ifindex,
2514 .iftype = iftype,
2515 .ifname = TAKE_PTR(ifname),
2516 .kind = TAKE_PTR(kind),
2517
2518 .bridge_vlan_pvid = UINT16_MAX,
2519
2520 .ipv6ll_address_gen_mode = _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_INVALID,
2521
2522 .state_file = TAKE_PTR(state_file),
2523 .lease_file = TAKE_PTR(lease_file),
2524 .lldp_file = TAKE_PTR(lldp_file),
2525
2526 .n_dns = UINT_MAX,
2527 .dns_default_route = -1,
2528 .llmnr = _RESOLVE_SUPPORT_INVALID,
2529 .mdns = _RESOLVE_SUPPORT_INVALID,
2530 .dnssec_mode = _DNSSEC_MODE_INVALID,
2531 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
2532 };
2533
2534 r = hashmap_ensure_put(&manager->links_by_index, NULL, INT_TO_PTR(link->ifindex), link);
2535 if (r < 0)
2536 return log_link_debug_errno(link, r, "Failed to store link into manager: %m");
2537
2538 link->manager = manager;
2539
2540 r = hashmap_ensure_put(&manager->links_by_name, &string_hash_ops, link->ifname, link);
2541 if (r < 0)
2542 return log_link_debug_errno(link, r, "Failed to manage link by its interface name: %m");
2543
2544 log_link_debug(link, "Saved new link: ifindex=%i, iftype=%s(%u), kind=%s",
2545 link->ifindex, strna(arphrd_to_name(link->iftype)), link->iftype, strna(link->kind));
2546
2547 /* If contained in this set, the link is wireless and the corresponding NL80211_CMD_NEW_INTERFACE
2548 * message arrived too early. Request the wireless link information again.
2549 */
2550 if (set_remove(manager->new_wlan_ifindices, INT_TO_PTR(link->ifindex))) {
2551 r = link_get_wlan_interface(link);
2552 if (r < 0)
2553 log_link_warning_errno(link, r, "Failed to get wireless interface, ignoring: %m");
2554 }
2555
2556 *ret = TAKE_PTR(link);
2557 return 0;
2558 }
2559
2560 int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, Manager *manager) {
2561 Link *link = NULL;
2562 NetDev *netdev = NULL;
2563 uint16_t type;
2564 const char *name;
2565 int r, ifindex;
2566
2567 assert(rtnl);
2568 assert(message);
2569 assert(manager);
2570
2571 if (sd_netlink_message_is_error(message)) {
2572 r = sd_netlink_message_get_errno(message);
2573 if (r < 0)
2574 log_message_warning_errno(message, r, "rtnl: Could not receive link message, ignoring");
2575
2576 return 0;
2577 }
2578
2579 r = sd_netlink_message_get_type(message, &type);
2580 if (r < 0) {
2581 log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
2582 return 0;
2583 } else if (!IN_SET(type, RTM_NEWLINK, RTM_DELLINK)) {
2584 log_warning("rtnl: Received unexpected message type %u when processing link, ignoring.", type);
2585 return 0;
2586 }
2587
2588 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2589 if (r < 0) {
2590 log_warning_errno(r, "rtnl: Could not get ifindex from link message, ignoring: %m");
2591 return 0;
2592 } else if (ifindex <= 0) {
2593 log_warning("rtnl: received link message with invalid ifindex %d, ignoring.", ifindex);
2594 return 0;
2595 }
2596
2597 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
2598 if (r < 0) {
2599 log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
2600 return 0;
2601 }
2602
2603 (void) link_get_by_index(manager, ifindex, &link);
2604 (void) netdev_get(manager, name, &netdev);
2605
2606 switch (type) {
2607 case RTM_NEWLINK:
2608 if (netdev) {
2609 /* netdev exists, so make sure the ifindex matches */
2610 r = netdev_set_ifindex(netdev, message);
2611 if (r < 0) {
2612 log_netdev_warning_errno(netdev, r, "Could not process new link message for netdev, ignoring: %m");
2613 return 0;
2614 }
2615 }
2616
2617 if (!link) {
2618 /* link is new, so add it */
2619 r = link_new(manager, message, &link);
2620 if (r < 0) {
2621 log_warning_errno(r, "Could not process new link message: %m");
2622 return 0;
2623 }
2624
2625 r = link_update(link, message);
2626 if (r < 0) {
2627 log_link_warning_errno(link, r, "Could not process link message: %m");
2628 link_enter_failed(link);
2629 return 0;
2630 }
2631
2632 r = link_check_initialized(link);
2633 if (r < 0) {
2634 log_link_warning_errno(link, r, "Failed to check link is initialized: %m");
2635 link_enter_failed(link);
2636 return 0;
2637 }
2638 } else {
2639 r = link_update(link, message);
2640 if (r < 0) {
2641 log_link_warning_errno(link, r, "Could not process link message: %m");
2642 link_enter_failed(link);
2643 return 0;
2644 }
2645 if (r > 0) {
2646 r = link_reconfigure_impl(link, /* force = */ false);
2647 if (r < 0) {
2648 log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
2649 link_enter_failed(link);
2650 return 0;
2651 }
2652 }
2653 }
2654 break;
2655
2656 case RTM_DELLINK:
2657 link_drop(link);
2658 netdev_drop(netdev);
2659 break;
2660
2661 default:
2662 assert_not_reached();
2663 }
2664
2665 return 1;
2666 }
2667
2668 int link_getlink_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, const char *error_msg) {
2669 uint16_t message_type;
2670 int r;
2671
2672 assert(m);
2673 assert(link);
2674 assert(error_msg);
2675
2676 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2677 return 0;
2678
2679 r = sd_netlink_message_get_errno(m);
2680 if (r < 0) {
2681 log_link_message_warning_errno(link, m, r, error_msg);
2682 link_enter_failed(link);
2683 return 0;
2684 }
2685
2686 r = sd_netlink_message_get_type(m, &message_type);
2687 if (r < 0) {
2688 log_link_debug_errno(link, r, "rtnl: failed to read link message type, ignoring: %m");
2689 return 0;
2690 }
2691 if (message_type != RTM_NEWLINK) {
2692 log_link_debug(link, "rtnl: received invalid link message type, ignoring.");
2693 return 0;
2694 }
2695
2696 r = link_update(link, m);
2697 if (r < 0) {
2698 link_enter_failed(link);
2699 return 0;
2700 }
2701
2702 return 1;
2703 }
2704
2705 int link_call_getlink(Link *link, link_netlink_message_handler_t callback) {
2706 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2707 int r;
2708
2709 assert(link);
2710 assert(link->manager);
2711 assert(link->manager->rtnl);
2712 assert(callback);
2713
2714 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
2715 if (r < 0)
2716 return r;
2717
2718 r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
2719 link_netlink_destroy_callback, link);
2720 if (r < 0)
2721 return r;
2722
2723 link_ref(link);
2724 return 0;
2725 }
2726
2727 static const char* const link_state_table[_LINK_STATE_MAX] = {
2728 [LINK_STATE_PENDING] = "pending",
2729 [LINK_STATE_INITIALIZED] = "initialized",
2730 [LINK_STATE_CONFIGURING] = "configuring",
2731 [LINK_STATE_CONFIGURED] = "configured",
2732 [LINK_STATE_UNMANAGED] = "unmanaged",
2733 [LINK_STATE_FAILED] = "failed",
2734 [LINK_STATE_LINGER] = "linger",
2735 };
2736
2737 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
2738
2739 int link_flags_to_string_alloc(uint32_t flags, char **ret) {
2740 _cleanup_free_ char *str = NULL;
2741 static const char* map[] = {
2742 [LOG2U(IFF_UP)] = "up", /* interface is up. */
2743 [LOG2U(IFF_BROADCAST)] = "broadcast", /* broadcast address valid. */
2744 [LOG2U(IFF_DEBUG)] = "debug", /* turn on debugging. */
2745 [LOG2U(IFF_LOOPBACK)] = "loopback", /* interface is a loopback net. */
2746 [LOG2U(IFF_POINTOPOINT)] = "point-to-point", /* interface has p-p link. */
2747 [LOG2U(IFF_NOTRAILERS)] = "no-trailers", /* avoid use of trailers. */
2748 [LOG2U(IFF_RUNNING)] = "running", /* interface RFC2863 OPER_UP. */
2749 [LOG2U(IFF_NOARP)] = "no-arp", /* no ARP protocol. */
2750 [LOG2U(IFF_PROMISC)] = "promiscuous", /* receive all packets. */
2751 [LOG2U(IFF_ALLMULTI)] = "all-multicast", /* receive all multicast packets. */
2752 [LOG2U(IFF_MASTER)] = "master", /* master of a load balancer. */
2753 [LOG2U(IFF_SLAVE)] = "slave", /* slave of a load balancer. */
2754 [LOG2U(IFF_MULTICAST)] = "multicast", /* supports multicast. */
2755 [LOG2U(IFF_PORTSEL)] = "portsel", /* can set media type. */
2756 [LOG2U(IFF_AUTOMEDIA)] = "auto-media", /* auto media select active. */
2757 [LOG2U(IFF_DYNAMIC)] = "dynamic", /* dialup device with changing addresses. */
2758 [LOG2U(IFF_LOWER_UP)] = "lower-up", /* driver signals L1 up. */
2759 [LOG2U(IFF_DORMANT)] = "dormant", /* driver signals dormant. */
2760 [LOG2U(IFF_ECHO)] = "echo", /* echo sent packets. */
2761 };
2762
2763 assert(ret);
2764
2765 for (size_t i = 0; i < ELEMENTSOF(map); i++)
2766 if (FLAGS_SET(flags, 1 << i) && map[i])
2767 if (!strextend_with_separator(&str, ",", map[i]))
2768 return -ENOMEM;
2769
2770 *ret = TAKE_PTR(str);
2771 return 0;
2772 }
2773
2774 static const char * const kernel_operstate_table[] = {
2775 [IF_OPER_UNKNOWN] = "unknown",
2776 [IF_OPER_NOTPRESENT] = "not-present",
2777 [IF_OPER_DOWN] = "down",
2778 [IF_OPER_LOWERLAYERDOWN] = "lower-layer-down",
2779 [IF_OPER_TESTING] = "testing",
2780 [IF_OPER_DORMANT] = "dormant",
2781 [IF_OPER_UP] = "up",
2782 };
2783
2784 DEFINE_STRING_TABLE_LOOKUP_TO_STRING(kernel_operstate, int);
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