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Merge pull request #25387 from yuwata/core-fix-gc-logic
[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-can.h"
39 #include "networkd-dhcp-prefix-delegation.h"
40 #include "networkd-dhcp-server.h"
41 #include "networkd-dhcp4.h"
42 #include "networkd-dhcp6.h"
43 #include "networkd-ipv4acd.h"
44 #include "networkd-ipv4ll.h"
45 #include "networkd-ipv6-proxy-ndp.h"
46 #include "networkd-link-bus.h"
47 #include "networkd-link.h"
48 #include "networkd-lldp-tx.h"
49 #include "networkd-manager.h"
50 #include "networkd-ndisc.h"
51 #include "networkd-neighbor.h"
52 #include "networkd-nexthop.h"
53 #include "networkd-queue.h"
54 #include "networkd-radv.h"
55 #include "networkd-route.h"
56 #include "networkd-routing-policy-rule.h"
57 #include "networkd-setlink.h"
58 #include "networkd-sriov.h"
59 #include "networkd-state-file.h"
60 #include "networkd-sysctl.h"
61 #include "networkd-wifi.h"
62 #include "set.h"
63 #include "socket-util.h"
64 #include "stdio-util.h"
65 #include "string-table.h"
66 #include "strv.h"
67 #include "tc.h"
68 #include "tmpfile-util.h"
69 #include "tuntap.h"
70 #include "udev-util.h"
71 #include "vrf.h"
72
73 bool link_ipv6_enabled(Link *link) {
74 assert(link);
75
76 if (!socket_ipv6_is_supported())
77 return false;
78
79 if (link->iftype == ARPHRD_CAN)
80 return false;
81
82 if (!link->network)
83 return false;
84
85 if (link->network->bond)
86 return false;
87
88 if (link_may_have_ipv6ll(link, /* check_multicast = */ false))
89 return true;
90
91 if (network_has_static_ipv6_configurations(link->network))
92 return true;
93
94 return false;
95 }
96
97 static bool link_is_ready_to_configure_one(Link *link, bool allow_unmanaged) {
98 assert(link);
99
100 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED, LINK_STATE_UNMANAGED))
101 return false;
102
103 if (!link->network)
104 return allow_unmanaged;
105
106 if (!link->network->configure_without_carrier) {
107 if (link->set_flags_messages > 0)
108 return false;
109
110 if (!link_has_carrier(link))
111 return false;
112 }
113
114 if (link->set_link_messages > 0)
115 return false;
116
117 if (!link->activated)
118 return false;
119
120 return true;
121 }
122
123 bool link_is_ready_to_configure(Link *link, bool allow_unmanaged) {
124 return check_ready_for_all_sr_iov_ports(link, allow_unmanaged, link_is_ready_to_configure_one);
125 }
126
127 void link_ntp_settings_clear(Link *link) {
128 link->ntp = strv_free(link->ntp);
129 }
130
131 void link_dns_settings_clear(Link *link) {
132 if (link->n_dns != UINT_MAX)
133 for (unsigned i = 0; i < link->n_dns; i++)
134 in_addr_full_free(link->dns[i]);
135 link->dns = mfree(link->dns);
136 link->n_dns = UINT_MAX;
137
138 link->search_domains = ordered_set_free(link->search_domains);
139 link->route_domains = ordered_set_free(link->route_domains);
140
141 link->dns_default_route = -1;
142 link->llmnr = _RESOLVE_SUPPORT_INVALID;
143 link->mdns = _RESOLVE_SUPPORT_INVALID;
144 link->dnssec_mode = _DNSSEC_MODE_INVALID;
145 link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
146
147 link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
148 }
149
150 static void link_free_engines(Link *link) {
151 if (!link)
152 return;
153
154 link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
155
156 link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client);
157 link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
158 link->dhcp4_6rd_tunnel_name = mfree(link->dhcp4_6rd_tunnel_name);
159
160 link->lldp_rx = sd_lldp_rx_unref(link->lldp_rx);
161 link->lldp_tx = sd_lldp_tx_unref(link->lldp_tx);
162
163 link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
164
165 link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
166 link->dhcp6_lease = sd_dhcp6_lease_unref(link->dhcp6_lease);
167
168 link->ndisc = sd_ndisc_unref(link->ndisc);
169 link->ndisc_expire = sd_event_source_disable_unref(link->ndisc_expire);
170 ndisc_flush(link);
171
172 link->radv = sd_radv_unref(link->radv);
173 }
174
175 static Link *link_free(Link *link) {
176 assert(link);
177
178 link_ntp_settings_clear(link);
179 link_dns_settings_clear(link);
180
181 link->routes = set_free(link->routes);
182 link->nexthops = set_free(link->nexthops);
183 link->neighbors = set_free(link->neighbors);
184 link->addresses = set_free(link->addresses);
185 link->qdiscs = set_free(link->qdiscs);
186 link->tclasses = set_free(link->tclasses);
187
188 link->dhcp_pd_prefixes = set_free(link->dhcp_pd_prefixes);
189
190 link_free_engines(link);
191
192 set_free(link->sr_iov_virt_port_ifindices);
193 free(link->ifname);
194 strv_free(link->alternative_names);
195 free(link->kind);
196 free(link->ssid);
197 free(link->previous_ssid);
198 free(link->driver);
199
200 unlink_and_free(link->lease_file);
201 unlink_and_free(link->lldp_file);
202 unlink_and_free(link->state_file);
203
204 sd_device_unref(link->dev);
205 netdev_unref(link->netdev);
206
207 hashmap_free(link->bound_to_links);
208 hashmap_free(link->bound_by_links);
209
210 set_free_with_destructor(link->slaves, link_unref);
211
212 network_unref(link->network);
213
214 sd_event_source_disable_unref(link->carrier_lost_timer);
215
216 return mfree(link);
217 }
218
219 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
220
221 int link_get_by_index(Manager *m, int ifindex, Link **ret) {
222 Link *link;
223
224 assert(m);
225 assert(ifindex > 0);
226
227 link = hashmap_get(m->links_by_index, INT_TO_PTR(ifindex));
228 if (!link)
229 return -ENODEV;
230
231 if (ret)
232 *ret = link;
233 return 0;
234 }
235
236 int link_get_by_name(Manager *m, const char *ifname, Link **ret) {
237 Link *link;
238
239 assert(m);
240 assert(ifname);
241
242 link = hashmap_get(m->links_by_name, ifname);
243 if (!link)
244 return -ENODEV;
245
246 if (ret)
247 *ret = link;
248 return 0;
249 }
250
251 int link_get_by_hw_addr(Manager *m, const struct hw_addr_data *hw_addr, Link **ret) {
252 Link *link;
253
254 assert(m);
255 assert(hw_addr);
256
257 link = hashmap_get(m->links_by_hw_addr, hw_addr);
258 if (!link)
259 return -ENODEV;
260
261 if (ret)
262 *ret = link;
263 return 0;
264 }
265
266 int link_get_master(Link *link, Link **ret) {
267 assert(link);
268 assert(link->manager);
269 assert(ret);
270
271 if (link->master_ifindex <= 0 || link->master_ifindex == link->ifindex)
272 return -ENODEV;
273
274 return link_get_by_index(link->manager, link->master_ifindex, ret);
275 }
276
277 void link_set_state(Link *link, LinkState state) {
278 assert(link);
279
280 if (link->state == state)
281 return;
282
283 log_link_debug(link, "State changed: %s -> %s",
284 link_state_to_string(link->state),
285 link_state_to_string(state));
286
287 link->state = state;
288
289 link_send_changed(link, "AdministrativeState", NULL);
290 link_dirty(link);
291 }
292
293 int link_stop_engines(Link *link, bool may_keep_dhcp) {
294 int r = 0, k;
295
296 assert(link);
297 assert(link->manager);
298 assert(link->manager->event);
299
300 bool keep_dhcp = may_keep_dhcp &&
301 link->network &&
302 !link->network->dhcp_send_decline && /* IPv4 ACD for the DHCPv4 address is running. */
303 (link->manager->restarting ||
304 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
305
306 if (!keep_dhcp) {
307 k = sd_dhcp_client_stop(link->dhcp_client);
308 if (k < 0)
309 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
310 }
311
312 k = sd_dhcp_server_stop(link->dhcp_server);
313 if (k < 0)
314 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 server: %m");
315
316 k = sd_lldp_rx_stop(link->lldp_rx);
317 if (k < 0)
318 r = log_link_warning_errno(link, k, "Could not stop LLDP Rx: %m");
319
320 k = sd_lldp_tx_stop(link->lldp_tx);
321 if (k < 0)
322 r = log_link_warning_errno(link, k, "Could not stop LLDP Tx: %m");
323
324 k = sd_ipv4ll_stop(link->ipv4ll);
325 if (k < 0)
326 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
327
328 k = ipv4acd_stop(link);
329 if (k < 0)
330 r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client: %m");
331
332 k = sd_dhcp6_client_stop(link->dhcp6_client);
333 if (k < 0)
334 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
335
336 k = dhcp_pd_remove(link, /* only_marked = */ false);
337 if (k < 0)
338 r = log_link_warning_errno(link, k, "Could not remove DHCPv6 PD addresses and routes: %m");
339
340 k = ndisc_stop(link);
341 if (k < 0)
342 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
343
344 ndisc_flush(link);
345
346 k = sd_radv_stop(link->radv);
347 if (k < 0)
348 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
349
350 return r;
351 }
352
353 void link_enter_failed(Link *link) {
354 assert(link);
355
356 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
357 return;
358
359 log_link_warning(link, "Failed");
360
361 link_set_state(link, LINK_STATE_FAILED);
362
363 (void) link_stop_engines(link, false);
364 }
365
366 void link_check_ready(Link *link) {
367 Address *a;
368
369 assert(link);
370
371 if (link->state == LINK_STATE_CONFIGURED)
372 return;
373
374 if (link->state != LINK_STATE_CONFIGURING)
375 return (void) log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state));
376
377 if (!link->network)
378 return (void) log_link_debug(link, "%s(): link is unmanaged.", __func__);
379
380 if (!link->tc_configured)
381 return (void) log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
382
383 if (link->set_link_messages > 0)
384 return (void) log_link_debug(link, "%s(): link layer is configuring.", __func__);
385
386 if (!link->activated)
387 return (void) log_link_debug(link, "%s(): link is not activated.", __func__);
388
389 if (link->iftype == ARPHRD_CAN) {
390 /* let's shortcut things for CAN which doesn't need most of checks below. */
391 link_set_state(link, LINK_STATE_CONFIGURED);
392 return;
393 }
394
395 if (!link->stacked_netdevs_created)
396 return (void) log_link_debug(link, "%s(): stacked netdevs are not created.", __func__);
397
398 if (!link->static_addresses_configured)
399 return (void) log_link_debug(link, "%s(): static addresses are not configured.", __func__);
400
401 SET_FOREACH(a, link->addresses)
402 if (!address_is_ready(a))
403 return (void) log_link_debug(link, "%s(): address %s is not ready.", __func__,
404 IN_ADDR_PREFIX_TO_STRING(a->family, &a->in_addr, a->prefixlen));
405
406 if (!link->static_address_labels_configured)
407 return (void) log_link_debug(link, "%s(): static address labels are not configured.", __func__);
408
409 if (!link->static_bridge_fdb_configured)
410 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
411
412 if (!link->static_bridge_mdb_configured)
413 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
414
415 if (!link->static_ipv6_proxy_ndp_configured)
416 return (void) log_link_debug(link, "%s(): static IPv6 proxy NDP addresses are not configured.", __func__);
417
418 if (!link->static_neighbors_configured)
419 return (void) log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
420
421 if (!link->static_nexthops_configured)
422 return (void) log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
423
424 if (!link->static_routes_configured)
425 return (void) log_link_debug(link, "%s(): static routes are not configured.", __func__);
426
427 if (!link->static_routing_policy_rules_configured)
428 return (void) log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
429
430 if (!link->sr_iov_configured)
431 return (void) log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
432
433 /* IPv6LL is assigned after the link gains its carrier. */
434 if (!link->network->configure_without_carrier &&
435 link_ipv6ll_enabled(link) &&
436 !in6_addr_is_set(&link->ipv6ll_address))
437 return (void) log_link_debug(link, "%s(): IPv6LL is not configured yet.", __func__);
438
439 bool has_dynamic_address = false;
440 SET_FOREACH(a, link->addresses) {
441 if (address_is_marked(a))
442 continue;
443 if (!address_exists(a))
444 continue;
445 if (IN_SET(a->source,
446 NETWORK_CONFIG_SOURCE_IPV4LL,
447 NETWORK_CONFIG_SOURCE_DHCP4,
448 NETWORK_CONFIG_SOURCE_DHCP6,
449 NETWORK_CONFIG_SOURCE_DHCP_PD,
450 NETWORK_CONFIG_SOURCE_NDISC)) {
451 has_dynamic_address = true;
452 break;
453 }
454 }
455
456 if ((link_ipv4ll_enabled(link) || link_dhcp4_enabled(link) || link_dhcp6_with_address_enabled(link) ||
457 (link_dhcp_pd_is_enabled(link) && link->network->dhcp_pd_assign)) && !has_dynamic_address)
458 /* When DHCP[46] or IPv4LL is enabled, at least one address is acquired by them. */
459 return (void) log_link_debug(link, "%s(): DHCPv4, DHCPv6, DHCP-PD or IPv4LL is enabled but no dynamic address is assigned yet.", __func__);
460
461 /* Ignore NDisc when ConfigureWithoutCarrier= is enabled, as IPv6AcceptRA= is enabled by default. */
462 if (link_ipv4ll_enabled(link) || link_dhcp4_enabled(link) ||
463 link_dhcp6_enabled(link) || link_dhcp_pd_is_enabled(link) ||
464 (!link->network->configure_without_carrier && link_ipv6_accept_ra_enabled(link))) {
465
466 if (!link->ipv4ll_address_configured && !link->dhcp4_configured &&
467 !link->dhcp6_configured && !link->dhcp_pd_configured && !link->ndisc_configured)
468 /* When DHCP[46], NDisc, or IPv4LL is enabled, at least one protocol must be finished. */
469 return (void) log_link_debug(link, "%s(): dynamic addresses or routes are not configured.", __func__);
470
471 log_link_debug(link, "%s(): IPv4LL:%s DHCPv4:%s DHCPv6:%s DHCP-PD:%s NDisc:%s",
472 __func__,
473 yes_no(link->ipv4ll_address_configured),
474 yes_no(link->dhcp4_configured),
475 yes_no(link->dhcp6_configured),
476 yes_no(link->dhcp_pd_configured),
477 yes_no(link->ndisc_configured));
478 }
479
480 link_set_state(link, LINK_STATE_CONFIGURED);
481 }
482
483 static int link_request_static_configs(Link *link) {
484 int r;
485
486 assert(link);
487 assert(link->network);
488 assert(link->state != _LINK_STATE_INVALID);
489
490 r = link_request_static_addresses(link);
491 if (r < 0)
492 return r;
493
494 r = link_request_static_address_labels(link);
495 if (r < 0)
496 return r;
497
498 r = link_request_static_bridge_fdb(link);
499 if (r < 0)
500 return r;
501
502 r = link_request_static_bridge_mdb(link);
503 if (r < 0)
504 return r;
505
506 r = link_request_static_ipv6_proxy_ndp_addresses(link);
507 if (r < 0)
508 return r;
509
510 r = link_request_static_neighbors(link);
511 if (r < 0)
512 return r;
513
514 r = link_request_static_nexthops(link, false);
515 if (r < 0)
516 return r;
517
518 r = link_request_static_routes(link, false);
519 if (r < 0)
520 return r;
521
522 r = link_request_static_routing_policy_rules(link);
523 if (r < 0)
524 return r;
525
526 return 0;
527 }
528
529 static int link_request_stacked_netdevs(Link *link) {
530 NetDev *netdev;
531 int r;
532
533 assert(link);
534
535 link->stacked_netdevs_created = false;
536
537 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) {
538 r = link_request_stacked_netdev(link, netdev);
539 if (r < 0)
540 return r;
541 }
542
543 if (link->create_stacked_netdev_messages == 0) {
544 link->stacked_netdevs_created = true;
545 link_check_ready(link);
546 }
547
548 return 0;
549 }
550
551 static int link_acquire_dynamic_ipv6_conf(Link *link) {
552 int r;
553
554 assert(link);
555
556 r = radv_start(link);
557 if (r < 0)
558 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Advertisement engine: %m");
559
560 r = ndisc_start(link);
561 if (r < 0)
562 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Discovery: %m");
563
564 r = dhcp6_start(link);
565 if (r < 0)
566 return log_link_warning_errno(link, r, "Failed to start DHCPv6 client: %m");
567
568 return 0;
569 }
570
571 static int link_acquire_dynamic_ipv4_conf(Link *link) {
572 int r;
573
574 assert(link);
575 assert(link->manager);
576 assert(link->manager->event);
577
578 if (link->dhcp_client) {
579 r = dhcp4_start(link);
580 if (r < 0)
581 return log_link_warning_errno(link, r, "Failed to start DHCPv4 client: %m");
582
583 log_link_debug(link, "Acquiring DHCPv4 lease.");
584
585 } else if (link->ipv4ll) {
586 if (in4_addr_is_set(&link->network->ipv4ll_start_address)) {
587 r = sd_ipv4ll_set_address(link->ipv4ll, &link->network->ipv4ll_start_address);
588 if (r < 0)
589 return log_link_warning_errno(link, r, "Could not set IPv4 link-local start address: %m");
590 }
591
592 r = sd_ipv4ll_start(link->ipv4ll);
593 if (r < 0)
594 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
595
596 log_link_debug(link, "Acquiring IPv4 link-local address.");
597 }
598
599 if (link->dhcp_server) {
600 r = sd_dhcp_server_start(link->dhcp_server);
601 if (r < 0)
602 return log_link_warning_errno(link, r, "Could not start DHCP server: %m");
603 }
604
605 r = ipv4acd_start(link);
606 if (r < 0)
607 return log_link_warning_errno(link, r, "Could not start IPv4 ACD client: %m");
608
609 return 0;
610 }
611
612 static int link_acquire_dynamic_conf(Link *link) {
613 int r;
614
615 assert(link);
616 assert(link->network);
617
618 r = link_acquire_dynamic_ipv4_conf(link);
619 if (r < 0)
620 return r;
621
622 if (in6_addr_is_set(&link->ipv6ll_address)) {
623 r = link_acquire_dynamic_ipv6_conf(link);
624 if (r < 0)
625 return r;
626 }
627
628 if (!link_radv_enabled(link) || !link->network->dhcp_pd_announce) {
629 /* DHCPv6PD downstream does not require IPv6LL address. But may require RADV to be
630 * configured, and RADV may not be configured yet here. Only acquire subnet prefix when
631 * RADV is disabled, or the announcement of the prefix is disabled. Otherwise, the
632 * below will be called in radv_start(). */
633 r = dhcp_request_prefix_delegation(link);
634 if (r < 0)
635 return log_link_warning_errno(link, r, "Failed to request DHCP delegated subnet prefix: %m");
636 }
637
638 if (link->lldp_tx) {
639 r = sd_lldp_tx_start(link->lldp_tx);
640 if (r < 0)
641 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
642 }
643
644 if (link->lldp_rx) {
645 r = sd_lldp_rx_start(link->lldp_rx);
646 if (r < 0)
647 return log_link_warning_errno(link, r, "Failed to start LLDP client: %m");
648 }
649
650 return 0;
651 }
652
653 int link_ipv6ll_gained(Link *link) {
654 int r;
655
656 assert(link);
657
658 log_link_info(link, "Gained IPv6LL");
659
660 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
661 return 0;
662
663 r = link_acquire_dynamic_ipv6_conf(link);
664 if (r < 0)
665 return r;
666
667 link_check_ready(link);
668 return 0;
669 }
670
671 int link_handle_bound_to_list(Link *link) {
672 bool required_up = false;
673 bool link_is_up = false;
674 Link *l;
675
676 assert(link);
677
678 /* If at least one interface in bound_to_links has carrier, then make this interface up.
679 * If all interfaces in bound_to_links do not, then make this interface down. */
680
681 if (hashmap_isempty(link->bound_to_links))
682 return 0;
683
684 if (link->flags & IFF_UP)
685 link_is_up = true;
686
687 HASHMAP_FOREACH(l, link->bound_to_links)
688 if (link_has_carrier(l)) {
689 required_up = true;
690 break;
691 }
692
693 if (!required_up && link_is_up)
694 return link_request_to_bring_up_or_down(link, /* up = */ false);
695 if (required_up && !link_is_up)
696 return link_request_to_bring_up_or_down(link, /* up = */ true);
697
698 return 0;
699 }
700
701 static int link_handle_bound_by_list(Link *link) {
702 Link *l;
703 int r;
704
705 assert(link);
706
707 /* Update up or down state of interfaces which depend on this interface's carrier state. */
708
709 if (hashmap_isempty(link->bound_by_links))
710 return 0;
711
712 HASHMAP_FOREACH(l, link->bound_by_links) {
713 r = link_handle_bound_to_list(l);
714 if (r < 0)
715 return r;
716 }
717
718 return 0;
719 }
720
721 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
722 int r;
723
724 assert(link);
725 assert(carrier);
726
727 if (link == carrier)
728 return 0;
729
730 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
731 return 0;
732
733 r = hashmap_ensure_put(h, NULL, INT_TO_PTR(carrier->ifindex), carrier);
734 if (r < 0)
735 return r;
736
737 link_dirty(link);
738
739 return 0;
740 }
741
742 static int link_new_bound_by_list(Link *link) {
743 Manager *m;
744 Link *carrier;
745 int r;
746
747 assert(link);
748 assert(link->manager);
749
750 m = link->manager;
751
752 HASHMAP_FOREACH(carrier, m->links_by_index) {
753 if (!carrier->network)
754 continue;
755
756 if (strv_isempty(carrier->network->bind_carrier))
757 continue;
758
759 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
760 r = link_put_carrier(link, carrier, &link->bound_by_links);
761 if (r < 0)
762 return r;
763 }
764 }
765
766 HASHMAP_FOREACH(carrier, link->bound_by_links) {
767 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
768 if (r < 0)
769 return r;
770 }
771
772 return 0;
773 }
774
775 static int link_new_bound_to_list(Link *link) {
776 Manager *m;
777 Link *carrier;
778 int r;
779
780 assert(link);
781 assert(link->manager);
782
783 if (!link->network)
784 return 0;
785
786 if (strv_isempty(link->network->bind_carrier))
787 return 0;
788
789 m = link->manager;
790
791 HASHMAP_FOREACH(carrier, m->links_by_index) {
792 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
793 r = link_put_carrier(link, carrier, &link->bound_to_links);
794 if (r < 0)
795 return r;
796 }
797 }
798
799 HASHMAP_FOREACH(carrier, link->bound_to_links) {
800 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
801 if (r < 0)
802 return r;
803 }
804
805 return 0;
806 }
807
808 static void link_free_bound_to_list(Link *link) {
809 bool updated = false;
810 Link *bound_to;
811
812 assert(link);
813
814 while ((bound_to = hashmap_steal_first(link->bound_to_links))) {
815 updated = true;
816
817 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
818 link_dirty(bound_to);
819 }
820
821 if (updated)
822 link_dirty(link);
823 }
824
825 static void link_free_bound_by_list(Link *link) {
826 bool updated = false;
827 Link *bound_by;
828
829 assert(link);
830
831 while ((bound_by = hashmap_steal_first(link->bound_by_links))) {
832 updated = true;
833
834 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
835 link_dirty(bound_by);
836 link_handle_bound_to_list(bound_by);
837 }
838 }
839
840 if (updated)
841 link_dirty(link);
842 }
843
844 static int link_append_to_master(Link *link) {
845 Link *master;
846 int r;
847
848 assert(link);
849
850 /* - The link may have no master.
851 * - RTM_NEWLINK message about master interface may not be received yet. */
852 if (link_get_master(link, &master) < 0)
853 return 0;
854
855 r = set_ensure_put(&master->slaves, NULL, link);
856 if (r <= 0)
857 return r;
858
859 link_ref(link);
860 return 0;
861 }
862
863 static void link_drop_from_master(Link *link) {
864 Link *master;
865
866 assert(link);
867
868 if (!link->manager)
869 return;
870
871 if (link_get_master(link, &master) < 0)
872 return;
873
874 link_unref(set_remove(master->slaves, link));
875 }
876
877 static void link_drop_requests(Link *link) {
878 Request *req;
879
880 assert(link);
881 assert(link->manager);
882
883 ORDERED_SET_FOREACH(req, link->manager->request_queue)
884 if (req->link == link)
885 request_detach(link->manager, req);
886 }
887
888 static Link *link_drop(Link *link) {
889 if (!link)
890 return NULL;
891
892 assert(link->manager);
893
894 link_set_state(link, LINK_STATE_LINGER);
895
896 /* Drop all references from other links and manager. Note that async netlink calls may have
897 * references to the link, and they will be dropped when we receive replies. */
898
899 link_drop_requests(link);
900
901 link_free_bound_to_list(link);
902 link_free_bound_by_list(link);
903
904 link_clear_sr_iov_ifindices(link);
905
906 link_drop_from_master(link);
907
908 if (link->state_file)
909 (void) unlink(link->state_file);
910
911 link_clean(link);
912
913 STRV_FOREACH(n, link->alternative_names)
914 hashmap_remove(link->manager->links_by_name, *n);
915 hashmap_remove(link->manager->links_by_name, link->ifname);
916
917 /* bonding master and its slaves have the same hardware address. */
918 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
919
920 /* The following must be called at last. */
921 assert_se(hashmap_remove(link->manager->links_by_index, INT_TO_PTR(link->ifindex)) == link);
922 return link_unref(link);
923 }
924
925 static int link_drop_foreign_config(Link *link) {
926 int k, r;
927
928 assert(link);
929 assert(link->manager);
930
931 /* Drop foreign config, but ignore unmanaged, loopback, or critical interfaces. We do not want
932 * to remove loopback address or addresses used for root NFS. */
933
934 if (IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
935 return 0;
936 if (FLAGS_SET(link->flags, IFF_LOOPBACK))
937 return 0;
938 if (link->network->keep_configuration == KEEP_CONFIGURATION_YES)
939 return 0;
940
941 r = link_drop_foreign_routes(link);
942
943 k = link_drop_foreign_nexthops(link);
944 if (k < 0 && r >= 0)
945 r = k;
946
947 k = link_drop_foreign_addresses(link);
948 if (k < 0 && r >= 0)
949 r = k;
950
951 k = link_drop_foreign_neighbors(link);
952 if (k < 0 && r >= 0)
953 r = k;
954
955 k = manager_drop_foreign_routing_policy_rules(link->manager);
956 if (k < 0 && r >= 0)
957 r = k;
958
959 return r;
960 }
961
962 static int link_drop_managed_config(Link *link) {
963 int k, r;
964
965 assert(link);
966 assert(link->manager);
967
968 r = link_drop_managed_routes(link);
969
970 k = link_drop_managed_nexthops(link);
971 if (k < 0 && r >= 0)
972 r = k;
973
974 k = link_drop_managed_addresses(link);
975 if (k < 0 && r >= 0)
976 r = k;
977
978 k = link_drop_managed_neighbors(link);
979 if (k < 0 && r >= 0)
980 r = k;
981
982 k = link_drop_managed_routing_policy_rules(link);
983 if (k < 0 && r >= 0)
984 r = k;
985
986 return r;
987 }
988
989 static void link_foreignize_config(Link *link) {
990 assert(link);
991 assert(link->manager);
992
993 link_foreignize_routes(link);
994 link_foreignize_nexthops(link);
995 link_foreignize_addresses(link);
996 link_foreignize_neighbors(link);
997 link_foreignize_routing_policy_rules(link);
998 }
999
1000 static int link_configure(Link *link) {
1001 int r;
1002
1003 assert(link);
1004 assert(link->network);
1005 assert(link->state == LINK_STATE_INITIALIZED);
1006
1007 link_set_state(link, LINK_STATE_CONFIGURING);
1008
1009 r = link_new_bound_to_list(link);
1010 if (r < 0)
1011 return r;
1012
1013 r = link_request_traffic_control(link);
1014 if (r < 0)
1015 return r;
1016
1017 if (link->iftype == ARPHRD_CAN) {
1018 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1019 r = link_request_to_set_can(link);
1020 if (r < 0)
1021 return r;
1022
1023 return link_request_to_activate(link);
1024 }
1025
1026 r = link_request_sr_iov_vfs(link);
1027 if (r < 0)
1028 return r;
1029
1030 r = link_set_sysctl(link);
1031 if (r < 0)
1032 return r;
1033
1034 r = link_request_to_set_mac(link, /* allow_retry = */ true);
1035 if (r < 0)
1036 return r;
1037
1038 r = link_request_to_set_ipoib(link);
1039 if (r < 0)
1040 return r;
1041
1042 r = link_request_to_set_flags(link);
1043 if (r < 0)
1044 return r;
1045
1046 r = link_request_to_set_group(link);
1047 if (r < 0)
1048 return r;
1049
1050 r = link_configure_mtu(link);
1051 if (r < 0)
1052 return r;
1053
1054 r = link_request_to_set_addrgen_mode(link);
1055 if (r < 0)
1056 return r;
1057
1058 r = link_request_to_set_master(link);
1059 if (r < 0)
1060 return r;
1061
1062 r = link_request_stacked_netdevs(link);
1063 if (r < 0)
1064 return r;
1065
1066 r = link_request_to_set_bond(link);
1067 if (r < 0)
1068 return r;
1069
1070 r = link_request_to_set_bridge(link);
1071 if (r < 0)
1072 return r;
1073
1074 r = link_request_to_set_bridge_vlan(link);
1075 if (r < 0)
1076 return r;
1077
1078 r = link_request_to_activate(link);
1079 if (r < 0)
1080 return r;
1081
1082 r = ipv4ll_configure(link);
1083 if (r < 0)
1084 return r;
1085
1086 r = link_request_dhcp4_client(link);
1087 if (r < 0)
1088 return r;
1089
1090 r = link_request_dhcp6_client(link);
1091 if (r < 0)
1092 return r;
1093
1094 r = link_request_ndisc(link);
1095 if (r < 0)
1096 return r;
1097
1098 r = link_request_dhcp_server(link);
1099 if (r < 0)
1100 return r;
1101
1102 r = link_request_radv(link);
1103 if (r < 0)
1104 return r;
1105
1106 r = link_lldp_rx_configure(link);
1107 if (r < 0)
1108 return r;
1109
1110 r = link_lldp_tx_configure(link);
1111 if (r < 0)
1112 return r;
1113
1114 r = link_drop_foreign_config(link);
1115 if (r < 0)
1116 return r;
1117
1118 r = link_request_static_configs(link);
1119 if (r < 0)
1120 return r;
1121
1122 if (!link_has_carrier(link))
1123 return 0;
1124
1125 return link_acquire_dynamic_conf(link);
1126 }
1127
1128 static int link_get_network(Link *link, Network **ret) {
1129 Network *network;
1130 int r;
1131
1132 assert(link);
1133 assert(link->manager);
1134 assert(ret);
1135
1136 ORDERED_HASHMAP_FOREACH(network, link->manager->networks) {
1137 bool warn = false;
1138
1139 r = net_match_config(
1140 &network->match,
1141 link->dev,
1142 &link->hw_addr,
1143 &link->permanent_hw_addr,
1144 link->driver,
1145 link->iftype,
1146 link->kind,
1147 link->ifname,
1148 link->alternative_names,
1149 link->wlan_iftype,
1150 link->ssid,
1151 &link->bssid);
1152 if (r < 0)
1153 return r;
1154 if (r == 0)
1155 continue;
1156
1157 if (network->match.ifname && link->dev) {
1158 uint8_t name_assign_type = NET_NAME_UNKNOWN;
1159 const char *attr;
1160
1161 if (sd_device_get_sysattr_value(link->dev, "name_assign_type", &attr) >= 0)
1162 (void) safe_atou8(attr, &name_assign_type);
1163
1164 warn = name_assign_type == NET_NAME_ENUM;
1165 }
1166
1167 log_link_full(link, warn ? LOG_WARNING : LOG_DEBUG,
1168 "found matching network '%s'%s.",
1169 network->filename,
1170 warn ? ", based on potentially unpredictable interface name" : "");
1171
1172 if (network->unmanaged)
1173 return -ENOENT;
1174
1175 *ret = network;
1176 return 0;
1177 }
1178
1179 return -ENOENT;
1180 }
1181
1182 int link_reconfigure_impl(Link *link, bool force) {
1183 Network *network = NULL;
1184 NetDev *netdev = NULL;
1185 int r;
1186
1187 assert(link);
1188
1189 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
1190 return 0;
1191
1192 r = netdev_get(link->manager, link->ifname, &netdev);
1193 if (r < 0 && r != -ENOENT)
1194 return r;
1195
1196 r = link_get_network(link, &network);
1197 if (r < 0 && r != -ENOENT)
1198 return r;
1199
1200 if (link->state != LINK_STATE_UNMANAGED && !network)
1201 /* If link is in initialized state, then link->network is also NULL. */
1202 force = true;
1203
1204 if (link->network == network && !force)
1205 return 0;
1206
1207 if (network) {
1208 if (link->state == LINK_STATE_INITIALIZED)
1209 log_link_info(link, "Configuring with %s.", network->filename);
1210 else
1211 log_link_info(link, "Reconfiguring with %s.", network->filename);
1212 } else
1213 log_link_full(link, link->state == LINK_STATE_INITIALIZED ? LOG_DEBUG : LOG_INFO,
1214 "Unmanaging interface.");
1215
1216 /* Dropping old .network file */
1217 r = link_stop_engines(link, false);
1218 if (r < 0)
1219 return r;
1220
1221 link_drop_requests(link);
1222
1223 if (network && !force && network->keep_configuration != KEEP_CONFIGURATION_YES)
1224 /* When a new/updated .network file is assigned, first make all configs (addresses,
1225 * routes, and so on) foreign, and then drop unnecessary configs later by
1226 * link_drop_foreign_config() in link_configure().
1227 * Note, when KeepConfiguration=yes, link_drop_foreign_config() does nothing. Hence,
1228 * here we need to drop the configs such as addresses, routes, and so on configured by
1229 * the previously assigned .network file. */
1230 link_foreignize_config(link);
1231 else {
1232 /* Remove all managed configs. Note, foreign configs are removed in later by
1233 * link_configure() -> link_drop_foreign_config() if the link is managed by us. */
1234 r = link_drop_managed_config(link);
1235 if (r < 0)
1236 return r;
1237 }
1238
1239 /* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the
1240 * bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will
1241 * not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the
1242 * map here, as it depends on .network files assigned to other links. */
1243 link_free_bound_to_list(link);
1244
1245 link_free_engines(link);
1246 link->network = network_unref(link->network);
1247
1248 netdev_unref(link->netdev);
1249 link->netdev = netdev_ref(netdev);
1250
1251 if (!network) {
1252 link_set_state(link, LINK_STATE_UNMANAGED);
1253 return 0;
1254 }
1255
1256 /* Then, apply new .network file */
1257 link->network = network_ref(network);
1258 link_update_operstate(link, true);
1259 link_dirty(link);
1260
1261 link_set_state(link, LINK_STATE_INITIALIZED);
1262 link->activated = false;
1263
1264 r = link_configure(link);
1265 if (r < 0)
1266 return r;
1267
1268 return 1;
1269 }
1270
1271 static int link_reconfigure_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, bool force) {
1272 int r;
1273
1274 assert(link);
1275
1276 r = link_getlink_handler_internal(rtnl, m, link, "Failed to update link state");
1277 if (r <= 0)
1278 return r;
1279
1280 r = link_reconfigure_impl(link, force);
1281 if (r < 0) {
1282 link_enter_failed(link);
1283 return 0;
1284 }
1285
1286 return r;
1287 }
1288
1289 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1290 return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ false);
1291 }
1292
1293 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1294 return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ true);
1295 }
1296
1297 int link_reconfigure(Link *link, bool force) {
1298 int r;
1299
1300 assert(link);
1301
1302 /* When link in pending or initialized state, then link_configure() will be called. To prevent
1303 * the function from being called multiple times simultaneously, refuse to reconfigure the
1304 * interface in these cases. */
1305 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
1306 return 0; /* 0 means no-op. */
1307
1308 r = link_call_getlink(link, force ? link_force_reconfigure_handler : link_reconfigure_handler);
1309 if (r < 0)
1310 return r;
1311
1312 return 1; /* 1 means the interface will be reconfigured. */
1313 }
1314
1315 static int link_initialized_and_synced(Link *link) {
1316 int r;
1317
1318 assert(link);
1319 assert(link->manager);
1320
1321 if (link->manager->test_mode) {
1322 log_link_debug(link, "Running in test mode, refusing to enter initialized state.");
1323 link_set_state(link, LINK_STATE_UNMANAGED);
1324 return 0;
1325 }
1326
1327 if (link->state == LINK_STATE_PENDING) {
1328 log_link_debug(link, "Link state is up-to-date");
1329 link_set_state(link, LINK_STATE_INITIALIZED);
1330
1331 r = link_new_bound_by_list(link);
1332 if (r < 0)
1333 return r;
1334
1335 r = link_handle_bound_by_list(link);
1336 if (r < 0)
1337 return r;
1338 }
1339
1340 return link_reconfigure_impl(link, /* force = */ false);
1341 }
1342
1343 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1344 int r;
1345
1346 r = link_getlink_handler_internal(rtnl, m, link, "Failed to wait for the interface to be initialized");
1347 if (r <= 0)
1348 return r;
1349
1350 r = link_initialized_and_synced(link);
1351 if (r < 0)
1352 link_enter_failed(link);
1353
1354 return 0;
1355 }
1356
1357 static int link_initialized(Link *link, sd_device *device) {
1358 int r;
1359
1360 assert(link);
1361 assert(device);
1362
1363 /* Always replace with the new sd_device object. As the sysname (and possibly other properties
1364 * or sysattrs) may be outdated. */
1365 device_unref_and_replace(link->dev, device);
1366
1367 if (link->dhcp_client) {
1368 r = sd_dhcp_client_attach_device(link->dhcp_client, link->dev);
1369 if (r < 0)
1370 log_link_warning_errno(link, r, "Failed to attach device to DHCPv4 client, ignoring: %m");
1371 }
1372
1373 if (link->dhcp6_client) {
1374 r = sd_dhcp6_client_attach_device(link->dhcp6_client, link->dev);
1375 if (r < 0)
1376 log_link_warning_errno(link, r, "Failed to attach device to DHCPv6 client, ignoring: %m");
1377 }
1378
1379 r = link_set_sr_iov_ifindices(link);
1380 if (r < 0)
1381 log_link_warning_errno(link, r, "Failed to manage SR-IOV PF and VF ports, ignoring: %m");
1382
1383 if (link->state != LINK_STATE_PENDING)
1384 return link_reconfigure(link, /* force = */ false);
1385
1386 log_link_debug(link, "udev initialized link");
1387
1388 /* udev has initialized the link, but we don't know if we have yet
1389 * processed the NEWLINK messages with the latest state. Do a GETLINK,
1390 * when it returns we know that the pending NEWLINKs have already been
1391 * processed and that we are up-to-date */
1392
1393 return link_call_getlink(link, link_initialized_handler);
1394 }
1395
1396 static int link_check_initialized(Link *link) {
1397 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
1398 int r;
1399
1400 assert(link);
1401
1402 if (!udev_available())
1403 return link_initialized_and_synced(link);
1404
1405 /* udev should be around */
1406 r = sd_device_new_from_ifindex(&device, link->ifindex);
1407 if (r < 0) {
1408 log_link_debug_errno(link, r, "Could not find device, waiting for device initialization: %m");
1409 return 0;
1410 }
1411
1412 r = sd_device_get_is_initialized(device);
1413 if (r < 0)
1414 return log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
1415 if (r == 0) {
1416 /* not yet ready */
1417 log_link_debug(link, "link pending udev initialization...");
1418 return 0;
1419 }
1420
1421 r = device_is_renaming(device);
1422 if (r < 0)
1423 return log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
1424 if (r > 0) {
1425 log_link_debug(link, "Interface is being renamed, pending initialization.");
1426 return 0;
1427 }
1428
1429 return link_initialized(link, device);
1430 }
1431
1432 int manager_udev_process_link(Manager *m, sd_device *device, sd_device_action_t action) {
1433 int r, ifindex;
1434 Link *link;
1435
1436 assert(m);
1437 assert(device);
1438
1439 r = sd_device_get_ifindex(device, &ifindex);
1440 if (r < 0)
1441 return log_device_debug_errno(device, r, "Failed to get ifindex: %m");
1442
1443 r = link_get_by_index(m, ifindex, &link);
1444 if (r < 0) {
1445 /* This error is not critical, as the corresponding rtnl message may be received later. */
1446 log_device_debug_errno(device, r, "Failed to get link from ifindex %i, ignoring: %m", ifindex);
1447 return 0;
1448 }
1449
1450 /* Let's unref the sd-device object assigned to the corresponding Link object, but keep the Link
1451 * object here. It will be removed only when rtnetlink says so. */
1452 if (action == SD_DEVICE_REMOVE) {
1453 link->dev = sd_device_unref(link->dev);
1454 return 0;
1455 }
1456
1457 r = device_is_renaming(device);
1458 if (r < 0)
1459 return log_device_debug_errno(device, r, "Failed to determine if the device is renaming or not: %m");
1460 if (r > 0) {
1461 log_device_debug(device, "Device is renaming, waiting for the interface to be renamed.");
1462 /* TODO:
1463 * What happens when a device is initialized, then soon renamed after that? When we detect
1464 * such, maybe we should cancel or postpone all queued requests for the interface. */
1465 return 0;
1466 }
1467
1468 r = link_initialized(link, device);
1469 if (r < 0)
1470 link_enter_failed(link);
1471
1472 return 0;
1473 }
1474
1475 static int link_carrier_gained(Link *link) {
1476 bool force_reconfigure;
1477 int r;
1478
1479 assert(link);
1480
1481 r = event_source_disable(link->carrier_lost_timer);
1482 if (r < 0)
1483 log_link_warning_errno(link, r, "Failed to disable carrier lost timer, ignoring: %m");
1484
1485 /* If a wireless interface was connected to an access point, and the SSID is changed (that is,
1486 * both previous_ssid and ssid are non-NULL), then the connected wireless network could be
1487 * changed. So, always reconfigure the link. Which means e.g. the DHCP client will be
1488 * restarted, and the correct network information will be gained.
1489 *
1490 * However, do not reconfigure the wireless interface forcibly if it was not connected to any
1491 * access points previously (previous_ssid is NULL in this case). As, a .network file may be
1492 * already assigned to the interface (in that case, the .network file does not have the SSID=
1493 * setting in the [Match] section), and the interface is already being configured. Of course,
1494 * there may exist another .network file with higher priority and a matching SSID= setting. But
1495 * in that case, link_reconfigure_impl() can handle that without the force_reconfigure flag.
1496 *
1497 * For non-wireless interfaces, we have no way to detect the connected network change. So,
1498 * setting force_reconfigure = false. Note, both ssid and previous_ssid are NULL in that case. */
1499 force_reconfigure = link->previous_ssid && !streq_ptr(link->previous_ssid, link->ssid);
1500 link->previous_ssid = mfree(link->previous_ssid);
1501
1502 /* AP and P2P-GO interfaces may have a new SSID - update the link properties in case a new .network
1503 * profile wants to match on it with SSID= in its [Match] section.
1504 */
1505 if (IN_SET(link->wlan_iftype, NL80211_IFTYPE_AP, NL80211_IFTYPE_P2P_GO)) {
1506 r = link_get_wlan_interface(link);
1507 if (r < 0)
1508 return r;
1509 }
1510
1511 /* At this stage, both wlan and link information should be up-to-date. Hence, it is not necessary to
1512 * call RTM_GETLINK, NL80211_CMD_GET_INTERFACE, or NL80211_CMD_GET_STATION commands, and simply call
1513 * link_reconfigure_impl(). Note, link_reconfigure_impl() returns 1 when the link is reconfigured. */
1514 r = link_reconfigure_impl(link, force_reconfigure);
1515 if (r != 0)
1516 return r;
1517
1518 r = link_handle_bound_by_list(link);
1519 if (r < 0)
1520 return r;
1521
1522 if (link->iftype == ARPHRD_CAN)
1523 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1524 return 0;
1525
1526 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
1527 r = link_acquire_dynamic_conf(link);
1528 if (r < 0)
1529 return r;
1530
1531 r = link_request_static_configs(link);
1532 if (r < 0)
1533 return r;
1534 }
1535
1536 return 0;
1537 }
1538
1539 static int link_carrier_lost_impl(Link *link) {
1540 int r, ret = 0;
1541
1542 assert(link);
1543
1544 link->previous_ssid = mfree(link->previous_ssid);
1545
1546 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1547 return 0;
1548
1549 if (!link->network)
1550 return 0;
1551
1552 r = link_stop_engines(link, false);
1553 if (r < 0)
1554 ret = r;
1555
1556 r = link_drop_managed_config(link);
1557 if (r < 0 && ret >= 0)
1558 ret = r;
1559
1560 return ret;
1561 }
1562
1563 static int link_carrier_lost_handler(sd_event_source *s, uint64_t usec, void *userdata) {
1564 Link *link = ASSERT_PTR(userdata);
1565 int r;
1566
1567 r = link_carrier_lost_impl(link);
1568 if (r < 0) {
1569 log_link_warning_errno(link, r, "Failed to process carrier lost event: %m");
1570 link_enter_failed(link);
1571 }
1572
1573 return 0;
1574 }
1575
1576 static int link_carrier_lost(Link *link) {
1577 uint16_t dhcp_mtu;
1578 usec_t usec;
1579 int r;
1580
1581 assert(link);
1582
1583 r = link_handle_bound_by_list(link);
1584 if (r < 0)
1585 return r;
1586
1587 if (link->iftype == ARPHRD_CAN)
1588 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1589 return 0;
1590
1591 if (!link->network)
1592 return 0;
1593
1594 if (link->network->ignore_carrier_loss_set)
1595 /* If IgnoreCarrierLoss= is explicitly specified, then use the specified value. */
1596 usec = link->network->ignore_carrier_loss_usec;
1597
1598 else if (link->network->bond && link->wlan_iftype > 0)
1599 /* Enslaving wlan interface to a bond disconnects from the connected AP, and causes its
1600 * carrier to be lost. See #19832. */
1601 usec = 3 * USEC_PER_SEC;
1602
1603 else if (link->network->dhcp_use_mtu &&
1604 link->dhcp_lease &&
1605 sd_dhcp_lease_get_mtu(link->dhcp_lease, &dhcp_mtu) >= 0 &&
1606 dhcp_mtu != link->original_mtu)
1607 /* Some drivers reset interfaces when changing MTU. Resetting interfaces by the static
1608 * MTU should not cause any issues, as MTU is changed only once. However, setting MTU
1609 * through DHCP lease causes an infinite loop of resetting the interface. See #18738. */
1610 usec = 5 * USEC_PER_SEC;
1611
1612 else
1613 /* Otherwise, use the currently set value. */
1614 usec = link->network->ignore_carrier_loss_usec;
1615
1616 if (usec == USEC_INFINITY)
1617 return 0;
1618
1619 if (usec == 0)
1620 return link_carrier_lost_impl(link);
1621
1622 return event_reset_time_relative(link->manager->event,
1623 &link->carrier_lost_timer,
1624 CLOCK_BOOTTIME,
1625 usec,
1626 0,
1627 link_carrier_lost_handler,
1628 link,
1629 0,
1630 "link-carrier-loss",
1631 true);
1632 }
1633
1634 static int link_admin_state_up(Link *link) {
1635 int r;
1636
1637 assert(link);
1638
1639 /* This is called every time an interface admin state changes to up;
1640 * specifically, when IFF_UP flag changes from unset to set. */
1641
1642 if (!link->network)
1643 return 0;
1644
1645 if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_DOWN) {
1646 log_link_info(link, "Activation policy is \"always-down\", forcing link down.");
1647 return link_request_to_bring_up_or_down(link, /* up = */ false);
1648 }
1649
1650 /* We set the ipv6 mtu after the device mtu, but the kernel resets
1651 * ipv6 mtu on NETDEV_UP, so we need to reset it. */
1652 r = link_set_ipv6_mtu(link);
1653 if (r < 0)
1654 log_link_warning_errno(link, r, "Cannot set IPv6 MTU, ignoring: %m");
1655
1656 return 0;
1657 }
1658
1659 static int link_admin_state_down(Link *link) {
1660 assert(link);
1661
1662 if (!link->network)
1663 return 0;
1664
1665 if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) {
1666 log_link_info(link, "Activation policy is \"always-up\", forcing link up.");
1667 return link_request_to_bring_up_or_down(link, /* up = */ true);
1668 }
1669
1670 return 0;
1671 }
1672
1673 static bool link_is_enslaved(Link *link) {
1674 if (link->flags & IFF_SLAVE)
1675 return true;
1676
1677 if (link->master_ifindex > 0)
1678 return true;
1679
1680 return false;
1681 }
1682
1683 static LinkAddressState address_state_from_scope(uint8_t scope) {
1684 if (scope < RT_SCOPE_SITE)
1685 /* universally accessible addresses found */
1686 return LINK_ADDRESS_STATE_ROUTABLE;
1687
1688 if (scope < RT_SCOPE_HOST)
1689 /* only link or site local addresses found */
1690 return LINK_ADDRESS_STATE_DEGRADED;
1691
1692 /* no useful addresses found */
1693 return LINK_ADDRESS_STATE_OFF;
1694 }
1695
1696 void link_update_operstate(Link *link, bool also_update_master) {
1697 LinkOperationalState operstate;
1698 LinkCarrierState carrier_state;
1699 LinkAddressState ipv4_address_state, ipv6_address_state, address_state;
1700 LinkOnlineState online_state;
1701 _cleanup_strv_free_ char **p = NULL;
1702 uint8_t ipv4_scope = RT_SCOPE_NOWHERE, ipv6_scope = RT_SCOPE_NOWHERE;
1703 bool changed = false;
1704 Address *address;
1705
1706 assert(link);
1707
1708 if (link->kernel_operstate == IF_OPER_DORMANT)
1709 carrier_state = LINK_CARRIER_STATE_DORMANT;
1710 else if (link_has_carrier(link)) {
1711 if (link_is_enslaved(link))
1712 carrier_state = LINK_CARRIER_STATE_ENSLAVED;
1713 else
1714 carrier_state = LINK_CARRIER_STATE_CARRIER;
1715 } else if (link->flags & IFF_UP)
1716 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
1717 else
1718 carrier_state = LINK_CARRIER_STATE_OFF;
1719
1720 if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
1721 Link *slave;
1722
1723 SET_FOREACH(slave, link->slaves) {
1724 link_update_operstate(slave, false);
1725
1726 if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
1727 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
1728 }
1729 }
1730
1731 SET_FOREACH(address, link->addresses) {
1732 if (!address_is_ready(address))
1733 continue;
1734
1735 if (address->family == AF_INET)
1736 ipv4_scope = MIN(ipv4_scope, address->scope);
1737
1738 if (address->family == AF_INET6)
1739 ipv6_scope = MIN(ipv6_scope, address->scope);
1740 }
1741
1742 ipv4_address_state = address_state_from_scope(ipv4_scope);
1743 ipv6_address_state = address_state_from_scope(ipv6_scope);
1744 address_state = address_state_from_scope(MIN(ipv4_scope, ipv6_scope));
1745
1746 /* Mapping of address and carrier state vs operational state
1747 * carrier state
1748 * | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
1749 * ------------------------------------------------------------------------------
1750 * off | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
1751 * address_state degraded | off | no-carrier | dormant | degraded-carrier | degraded | enslaved
1752 * routable | off | no-carrier | dormant | degraded-carrier | routable | routable
1753 */
1754
1755 if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
1756 operstate = (LinkOperationalState) carrier_state;
1757 else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
1758 operstate = LINK_OPERSTATE_ROUTABLE;
1759 else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
1760 operstate = LINK_OPERSTATE_DEGRADED;
1761 else
1762 operstate = LINK_OPERSTATE_ENSLAVED;
1763
1764 /* Only determine online state for managed links with RequiredForOnline=yes */
1765 if (!link->network || !link->network->required_for_online)
1766 online_state = _LINK_ONLINE_STATE_INVALID;
1767 else if (operstate < link->network->required_operstate_for_online.min ||
1768 operstate > link->network->required_operstate_for_online.max)
1769 online_state = LINK_ONLINE_STATE_OFFLINE;
1770 else {
1771 AddressFamily required_family = link->network->required_family_for_online;
1772 bool needs_ipv4 = required_family & ADDRESS_FAMILY_IPV4;
1773 bool needs_ipv6 = required_family & ADDRESS_FAMILY_IPV6;
1774
1775 /* The operational state is within the range required for online.
1776 * If a particular address family is also required, we might revert
1777 * to offline in the blocks below. */
1778 online_state = LINK_ONLINE_STATE_ONLINE;
1779
1780 if (link->network->required_operstate_for_online.min >= LINK_OPERSTATE_DEGRADED) {
1781 if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_DEGRADED)
1782 online_state = LINK_ONLINE_STATE_OFFLINE;
1783 if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_DEGRADED)
1784 online_state = LINK_ONLINE_STATE_OFFLINE;
1785 }
1786
1787 if (link->network->required_operstate_for_online.min >= LINK_OPERSTATE_ROUTABLE) {
1788 if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1789 online_state = LINK_ONLINE_STATE_OFFLINE;
1790 if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1791 online_state = LINK_ONLINE_STATE_OFFLINE;
1792 }
1793 }
1794
1795 if (link->carrier_state != carrier_state) {
1796 link->carrier_state = carrier_state;
1797 changed = true;
1798 if (strv_extend(&p, "CarrierState") < 0)
1799 log_oom();
1800 }
1801
1802 if (link->address_state != address_state) {
1803 link->address_state = address_state;
1804 changed = true;
1805 if (strv_extend(&p, "AddressState") < 0)
1806 log_oom();
1807 }
1808
1809 if (link->ipv4_address_state != ipv4_address_state) {
1810 link->ipv4_address_state = ipv4_address_state;
1811 changed = true;
1812 if (strv_extend(&p, "IPv4AddressState") < 0)
1813 log_oom();
1814 }
1815
1816 if (link->ipv6_address_state != ipv6_address_state) {
1817 link->ipv6_address_state = ipv6_address_state;
1818 changed = true;
1819 if (strv_extend(&p, "IPv6AddressState") < 0)
1820 log_oom();
1821 }
1822
1823 if (link->operstate != operstate) {
1824 link->operstate = operstate;
1825 changed = true;
1826 if (strv_extend(&p, "OperationalState") < 0)
1827 log_oom();
1828 }
1829
1830 if (link->online_state != online_state) {
1831 link->online_state = online_state;
1832 changed = true;
1833 if (strv_extend(&p, "OnlineState") < 0)
1834 log_oom();
1835 }
1836
1837 if (p)
1838 link_send_changed_strv(link, p);
1839 if (changed)
1840 link_dirty(link);
1841
1842 if (also_update_master) {
1843 Link *master;
1844
1845 if (link_get_master(link, &master) >= 0)
1846 link_update_operstate(master, true);
1847 }
1848 }
1849
1850 #define FLAG_STRING(string, flag, old, new) \
1851 (((old ^ new) & flag) \
1852 ? ((old & flag) ? (" -" string) : (" +" string)) \
1853 : "")
1854
1855 static int link_update_flags(Link *link, sd_netlink_message *message) {
1856 bool link_was_admin_up, had_carrier;
1857 uint8_t operstate;
1858 unsigned flags;
1859 int r;
1860
1861 assert(link);
1862 assert(message);
1863
1864 r = sd_rtnl_message_link_get_flags(message, &flags);
1865 if (r < 0)
1866 return log_link_debug_errno(link, r, "rtnl: failed to read link flags: %m");
1867
1868 r = sd_netlink_message_read_u8(message, IFLA_OPERSTATE, &operstate);
1869 if (r == -ENODATA)
1870 /* If we got a message without operstate, assume the state was unchanged. */
1871 operstate = link->kernel_operstate;
1872 else if (r < 0)
1873 return log_link_debug_errno(link, r, "rtnl: failed to read operational state: %m");
1874
1875 if (link->flags == flags && link->kernel_operstate == operstate)
1876 return 0;
1877
1878 if (link->flags != flags) {
1879 unsigned unknown_flags, unknown_flags_added, unknown_flags_removed;
1880
1881 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",
1882 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
1883 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
1884 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
1885 FLAG_STRING("UP", IFF_UP, link->flags, flags),
1886 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
1887 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
1888 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
1889 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
1890 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
1891 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
1892 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
1893 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
1894 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
1895 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
1896 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
1897 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
1898 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
1899 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
1900 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
1901
1902 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
1903 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
1904 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
1905 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
1906 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
1907 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
1908 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
1909 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
1910
1911 if (unknown_flags_added)
1912 log_link_debug(link, "Unknown link flags gained, ignoring: %#.5x", unknown_flags_added);
1913
1914 if (unknown_flags_removed)
1915 log_link_debug(link, "Unknown link flags lost, ignoring: %#.5x", unknown_flags_removed);
1916 }
1917
1918 link_was_admin_up = link->flags & IFF_UP;
1919 had_carrier = link_has_carrier(link);
1920
1921 link->flags = flags;
1922 link->kernel_operstate = operstate;
1923
1924 link_update_operstate(link, true);
1925
1926 if (!link_was_admin_up && (link->flags & IFF_UP)) {
1927 log_link_info(link, "Link UP");
1928
1929 r = link_admin_state_up(link);
1930 if (r < 0)
1931 return r;
1932 } else if (link_was_admin_up && !(link->flags & IFF_UP)) {
1933 log_link_info(link, "Link DOWN");
1934
1935 r = link_admin_state_down(link);
1936 if (r < 0)
1937 return r;
1938 }
1939
1940 if (!had_carrier && link_has_carrier(link)) {
1941 log_link_info(link, "Gained carrier");
1942
1943 r = link_carrier_gained(link);
1944 if (r < 0)
1945 return r;
1946 } else if (had_carrier && !link_has_carrier(link)) {
1947 log_link_info(link, "Lost carrier");
1948
1949 r = link_carrier_lost(link);
1950 if (r < 0)
1951 return r;
1952 }
1953
1954 return 0;
1955 }
1956
1957 static int link_update_master(Link *link, sd_netlink_message *message) {
1958 int master_ifindex, r;
1959
1960 assert(link);
1961 assert(message);
1962
1963 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t*) &master_ifindex);
1964 if (r == -ENODATA)
1965 return 0;
1966 if (r < 0)
1967 return log_link_debug_errno(link, r, "rtnl: failed to read master ifindex: %m");
1968
1969 if (master_ifindex == link->ifindex)
1970 master_ifindex = 0;
1971
1972 if (master_ifindex == link->master_ifindex)
1973 return 0;
1974
1975 if (link->master_ifindex == 0)
1976 log_link_debug(link, "Attached to master interface: %i", master_ifindex);
1977 else if (master_ifindex == 0)
1978 log_link_debug(link, "Detached from master interface: %i", link->master_ifindex);
1979 else
1980 log_link_debug(link, "Master interface changed: %i %s %i", link->master_ifindex,
1981 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), master_ifindex);
1982
1983 link_drop_from_master(link);
1984
1985 link->master_ifindex = master_ifindex;
1986
1987 r = link_append_to_master(link);
1988 if (r < 0)
1989 return log_link_debug_errno(link, r, "Failed to append link to master: %m");
1990
1991 return 0;
1992 }
1993
1994 static int link_update_driver(Link *link, sd_netlink_message *message) {
1995 int r;
1996
1997 assert(link);
1998 assert(link->manager);
1999 assert(message);
2000
2001 /* Driver is already read. Assuming the driver is never changed. */
2002 if (link->ethtool_driver_read)
2003 return 0;
2004
2005 /* When udevd is running, read the driver after the interface is initialized by udevd.
2006 * Otherwise, ethtool may not work correctly. See issue #22538.
2007 * When udevd is not running, read the value when the interface is detected. */
2008 if (udev_available() && !link->dev)
2009 return 0;
2010
2011 link->ethtool_driver_read = true;
2012
2013 r = ethtool_get_driver(&link->manager->ethtool_fd, link->ifname, &link->driver);
2014 if (r < 0) {
2015 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
2016 return 0;
2017 }
2018
2019 log_link_debug(link, "Found driver: %s", strna(link->driver));
2020
2021 if (streq_ptr(link->driver, "dsa")) {
2022 uint32_t dsa_master_ifindex = 0;
2023
2024 r = sd_netlink_message_read_u32(message, IFLA_LINK, &dsa_master_ifindex);
2025 if (r < 0 && r != -ENODATA)
2026 return log_link_debug_errno(link, r, "rtnl: failed to read ifindex of the DSA master interface: %m");
2027
2028 if (dsa_master_ifindex > INT_MAX) {
2029 log_link_debug(link, "rtnl: received too large DSA master ifindex (%"PRIu32" > INT_MAX), ignoring.",
2030 dsa_master_ifindex);
2031 dsa_master_ifindex = 0;
2032 }
2033
2034 link->dsa_master_ifindex = (int) dsa_master_ifindex;
2035 }
2036
2037 return 1; /* needs reconfigure */
2038 }
2039
2040 static int link_update_permanent_hardware_address_from_ethtool(Link *link, sd_netlink_message *message) {
2041 int r;
2042
2043 assert(link);
2044 assert(link->manager);
2045 assert(message);
2046
2047 if (link->ethtool_permanent_hw_addr_read)
2048 return 0;
2049
2050 /* When udevd is running, read the permanent hardware address after the interface is
2051 * initialized by udevd. Otherwise, ethtool may not work correctly. See issue #22538.
2052 * When udevd is not running, read the value when the interface is detected. */
2053 if (udev_available() && !link->dev)
2054 return 0;
2055
2056 /* If the interface does not have a hardware address, then it will not have a permanent address either. */
2057 r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, NULL);
2058 if (r == -ENODATA)
2059 return 0;
2060 if (r < 0)
2061 return log_link_debug_errno(link, r, "Failed to read IFLA_ADDRESS attribute: %m");
2062
2063 link->ethtool_permanent_hw_addr_read = true;
2064
2065 r = ethtool_get_permanent_hw_addr(&link->manager->ethtool_fd, link->ifname, &link->permanent_hw_addr);
2066 if (r < 0)
2067 log_link_debug_errno(link, r, "Permanent hardware address not found, continuing without: %m");
2068
2069 return 0;
2070 }
2071
2072 static int link_update_permanent_hardware_address(Link *link, sd_netlink_message *message) {
2073 int r;
2074
2075 assert(link);
2076 assert(link->manager);
2077 assert(message);
2078
2079 if (link->permanent_hw_addr.length > 0)
2080 return 0;
2081
2082 r = netlink_message_read_hw_addr(message, IFLA_PERM_ADDRESS, &link->permanent_hw_addr);
2083 if (r < 0) {
2084 if (r != -ENODATA)
2085 return log_link_debug_errno(link, r, "Failed to read IFLA_PERM_ADDRESS attribute: %m");
2086
2087 /* Fallback to ethtool for older kernels. */
2088 r = link_update_permanent_hardware_address_from_ethtool(link, message);
2089 if (r < 0)
2090 return r;
2091 }
2092
2093 if (link->permanent_hw_addr.length > 0)
2094 log_link_debug(link, "Saved permanent hardware address: %s", HW_ADDR_TO_STR(&link->permanent_hw_addr));
2095
2096 return 1; /* needs reconfigure */
2097 }
2098
2099 static int link_update_hardware_address(Link *link, sd_netlink_message *message) {
2100 struct hw_addr_data addr;
2101 int r;
2102
2103 assert(link);
2104 assert(message);
2105
2106 r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr);
2107 if (r < 0 && r != -ENODATA)
2108 return log_link_debug_errno(link, r, "rtnl: failed to read broadcast address: %m");
2109
2110 r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &addr);
2111 if (r == -ENODATA)
2112 return 0;
2113 if (r < 0)
2114 return log_link_debug_errno(link, r, "rtnl: failed to read hardware address: %m");
2115
2116 if (hw_addr_equal(&link->hw_addr, &addr))
2117 return 0;
2118
2119 if (link->hw_addr.length == 0)
2120 log_link_debug(link, "Saved hardware address: %s", HW_ADDR_TO_STR(&addr));
2121 else {
2122 log_link_debug(link, "Hardware address is changed: %s %s %s",
2123 HW_ADDR_TO_STR(&link->hw_addr),
2124 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT),
2125 HW_ADDR_TO_STR(&addr));
2126
2127 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
2128 }
2129
2130 link->hw_addr = addr;
2131
2132 if (!hw_addr_is_null(&link->hw_addr)) {
2133 r = hashmap_ensure_put(&link->manager->links_by_hw_addr, &hw_addr_hash_ops, &link->hw_addr, link);
2134 if (r == -EEXIST && streq_ptr(link->kind, "bond"))
2135 /* bonding master and its slaves have the same hardware address. */
2136 r = hashmap_replace(link->manager->links_by_hw_addr, &link->hw_addr, link);
2137 if (r < 0)
2138 log_link_debug_errno(link, r, "Failed to manage link by its new hardware address, ignoring: %m");
2139 }
2140
2141 r = ipv4ll_update_mac(link);
2142 if (r < 0)
2143 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m");
2144
2145 r = ipv4ll_update_mac(link);
2146 if (r < 0)
2147 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
2148
2149 r = dhcp4_update_mac(link);
2150 if (r < 0)
2151 return log_link_debug_errno(link, r, "Could not update MAC address in DHCP client: %m");
2152
2153 r = dhcp6_update_mac(link);
2154 if (r < 0)
2155 return log_link_debug_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
2156
2157 r = radv_update_mac(link);
2158 if (r < 0)
2159 return log_link_debug_errno(link, r, "Could not update MAC address for Router Advertisement: %m");
2160
2161 if (link->ndisc && link->hw_addr.length == ETH_ALEN) {
2162 r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether);
2163 if (r < 0)
2164 return log_link_debug_errno(link, r, "Could not update MAC for NDisc: %m");
2165 }
2166
2167 if (link->lldp_rx) {
2168 r = sd_lldp_rx_set_filter_address(link->lldp_rx, &link->hw_addr.ether);
2169 if (r < 0)
2170 return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Rx: %m");
2171 }
2172
2173 if (link->lldp_tx) {
2174 r = sd_lldp_tx_set_hwaddr(link->lldp_tx, &link->hw_addr.ether);
2175 if (r < 0)
2176 return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Tx: %m");
2177 }
2178
2179 return 1; /* needs reconfigure */
2180 }
2181
2182 static int link_update_mtu(Link *link, sd_netlink_message *message) {
2183 uint32_t mtu, min_mtu = 0, max_mtu = UINT32_MAX;
2184 int r;
2185
2186 assert(link);
2187 assert(message);
2188
2189 r = sd_netlink_message_read_u32(message, IFLA_MTU, &mtu);
2190 if (r == -ENODATA)
2191 return 0;
2192 if (r < 0)
2193 return log_link_debug_errno(link, r, "rtnl: failed to read MTU in RTM_NEWLINK message: %m");
2194 if (mtu == 0)
2195 return 0;
2196
2197 r = sd_netlink_message_read_u32(message, IFLA_MIN_MTU, &min_mtu);
2198 if (r < 0 && r != -ENODATA)
2199 return log_link_debug_errno(link, r, "rtnl: failed to read minimum MTU in RTM_NEWLINK message: %m");
2200
2201 r = sd_netlink_message_read_u32(message, IFLA_MAX_MTU, &max_mtu);
2202 if (r < 0 && r != -ENODATA)
2203 return log_link_debug_errno(link, r, "rtnl: failed to read maximum MTU in RTM_NEWLINK message: %m");
2204
2205 if (max_mtu == 0)
2206 max_mtu = UINT32_MAX;
2207
2208 link->min_mtu = min_mtu;
2209 link->max_mtu = max_mtu;
2210
2211 if (link->original_mtu == 0) {
2212 link->original_mtu = mtu;
2213 log_link_debug(link, "Saved original MTU %" PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2214 link->original_mtu, link->min_mtu, link->max_mtu);
2215 }
2216
2217 if (link->mtu == mtu)
2218 return 0;
2219
2220 if (link->mtu != 0)
2221 log_link_debug(link, "MTU is changed: %"PRIu32" %s %"PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2222 link->mtu, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), mtu,
2223 link->min_mtu, link->max_mtu);
2224
2225 link->mtu = mtu;
2226
2227 if (link->dhcp_client) {
2228 r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
2229 if (r < 0)
2230 return log_link_debug_errno(link, r, "Could not update MTU in DHCP client: %m");
2231 }
2232
2233 if (link->radv) {
2234 r = sd_radv_set_mtu(link->radv, link->mtu);
2235 if (r < 0)
2236 return log_link_debug_errno(link, r, "Could not set MTU for Router Advertisement: %m");
2237 }
2238
2239 return 0;
2240 }
2241
2242 static int link_update_alternative_names(Link *link, sd_netlink_message *message) {
2243 _cleanup_strv_free_ char **altnames = NULL;
2244 int r;
2245
2246 assert(link);
2247 assert(message);
2248
2249 r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &altnames);
2250 if (r == -ENODATA)
2251 /* The message does not have IFLA_PROP_LIST container attribute. It does not mean the
2252 * interface has no alternative name. */
2253 return 0;
2254 if (r < 0)
2255 return log_link_debug_errno(link, r, "rtnl: failed to read alternative names: %m");
2256
2257 if (strv_equal(altnames, link->alternative_names))
2258 return 0;
2259
2260 STRV_FOREACH(n, link->alternative_names)
2261 hashmap_remove(link->manager->links_by_name, *n);
2262
2263 strv_free_and_replace(link->alternative_names, altnames);
2264
2265 STRV_FOREACH(n, link->alternative_names) {
2266 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, *n, link);
2267 if (r < 0)
2268 return log_link_debug_errno(link, r, "Failed to manage link by its new alternative names: %m");
2269 }
2270
2271 return 1; /* needs reconfigure */
2272 }
2273
2274 static int link_update_name(Link *link, sd_netlink_message *message) {
2275 char ifname_from_index[IF_NAMESIZE];
2276 const char *ifname;
2277 int r;
2278
2279 assert(link);
2280 assert(message);
2281
2282 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
2283 if (r == -ENODATA)
2284 /* Hmm?? But ok. */
2285 return 0;
2286 if (r < 0)
2287 return log_link_debug_errno(link, r, "Failed to read interface name in RTM_NEWLINK message: %m");
2288
2289 if (streq(ifname, link->ifname))
2290 return 0;
2291
2292 r = format_ifname(link->ifindex, ifname_from_index);
2293 if (r < 0)
2294 return log_link_debug_errno(link, r, "Could not get interface name for index %i.", link->ifindex);
2295
2296 if (!streq(ifname, ifname_from_index)) {
2297 log_link_debug(link, "New interface name '%s' received from the kernel does not correspond "
2298 "with the name currently configured on the actual interface '%s'. Ignoring.",
2299 ifname, ifname_from_index);
2300 return 0;
2301 }
2302
2303 log_link_info(link, "Interface name change detected, renamed to %s.", ifname);
2304
2305 hashmap_remove(link->manager->links_by_name, link->ifname);
2306
2307 r = free_and_strdup(&link->ifname, ifname);
2308 if (r < 0)
2309 return log_oom_debug();
2310
2311 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, link->ifname, link);
2312 if (r < 0)
2313 return log_link_debug_errno(link, r, "Failed to manage link by its new name: %m");
2314
2315 if (link->dhcp_client) {
2316 r = sd_dhcp_client_set_ifname(link->dhcp_client, link->ifname);
2317 if (r < 0)
2318 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP client: %m");
2319 }
2320
2321 if (link->dhcp6_client) {
2322 r = sd_dhcp6_client_set_ifname(link->dhcp6_client, link->ifname);
2323 if (r < 0)
2324 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP6 client: %m");
2325 }
2326
2327 if (link->ndisc) {
2328 r = sd_ndisc_set_ifname(link->ndisc, link->ifname);
2329 if (r < 0)
2330 return log_link_debug_errno(link, r, "Failed to update interface name in NDisc: %m");
2331 }
2332
2333 if (link->dhcp_server) {
2334 r = sd_dhcp_server_set_ifname(link->dhcp_server, link->ifname);
2335 if (r < 0)
2336 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP server: %m");
2337 }
2338
2339 if (link->radv) {
2340 r = sd_radv_set_ifname(link->radv, link->ifname);
2341 if (r < 0)
2342 return log_link_debug_errno(link, r, "Failed to update interface name in Router Advertisement: %m");
2343 }
2344
2345 if (link->lldp_rx) {
2346 r = sd_lldp_rx_set_ifname(link->lldp_rx, link->ifname);
2347 if (r < 0)
2348 return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Rx: %m");
2349 }
2350
2351 if (link->lldp_tx) {
2352 r = sd_lldp_tx_set_ifname(link->lldp_tx, link->ifname);
2353 if (r < 0)
2354 return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Tx: %m");
2355 }
2356
2357 if (link->ipv4ll) {
2358 r = sd_ipv4ll_set_ifname(link->ipv4ll, link->ifname);
2359 if (r < 0)
2360 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4LL client: %m");
2361 }
2362
2363 r = ipv4acd_set_ifname(link);
2364 if (r < 0)
2365 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4ACD client: %m");
2366
2367 return 1; /* needs reconfigure */
2368 }
2369
2370 static int link_update(Link *link, sd_netlink_message *message) {
2371 bool needs_reconfigure = false;
2372 int r;
2373
2374 assert(link);
2375 assert(message);
2376
2377 r = link_update_name(link, message);
2378 if (r < 0)
2379 return r;
2380 needs_reconfigure = needs_reconfigure || r > 0;
2381
2382 r = link_update_alternative_names(link, message);
2383 if (r < 0)
2384 return r;
2385 needs_reconfigure = needs_reconfigure || r > 0;
2386
2387 r = link_update_mtu(link, message);
2388 if (r < 0)
2389 return r;
2390
2391 r = link_update_driver(link, message);
2392 if (r < 0)
2393 return r;
2394 needs_reconfigure = needs_reconfigure || r > 0;
2395
2396 r = link_update_permanent_hardware_address(link, message);
2397 if (r < 0)
2398 return r;
2399 needs_reconfigure = needs_reconfigure || r > 0;
2400
2401 r = link_update_hardware_address(link, message);
2402 if (r < 0)
2403 return r;
2404 needs_reconfigure = needs_reconfigure || r > 0;
2405
2406 r = link_update_master(link, message);
2407 if (r < 0)
2408 return r;
2409
2410 r = link_update_ipv6ll_addrgen_mode(link, message);
2411 if (r < 0)
2412 return r;
2413
2414 r = link_update_flags(link, message);
2415 if (r < 0)
2416 return r;
2417
2418 return needs_reconfigure;
2419 }
2420
2421 static Link *link_drop_or_unref(Link *link) {
2422 if (!link)
2423 return NULL;
2424 if (!link->manager)
2425 return link_unref(link);
2426 return link_drop(link);
2427 }
2428
2429 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_drop_or_unref);
2430
2431 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
2432 _cleanup_free_ char *ifname = NULL, *kind = NULL, *state_file = NULL, *lease_file = NULL, *lldp_file = NULL;
2433 _cleanup_(link_drop_or_unrefp) Link *link = NULL;
2434 unsigned short iftype;
2435 int r, ifindex;
2436
2437 assert(manager);
2438 assert(message);
2439 assert(ret);
2440
2441 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2442 if (r < 0)
2443 return log_debug_errno(r, "rtnl: failed to read ifindex from link message: %m");
2444 else if (ifindex <= 0)
2445 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "rtnl: received link message without valid ifindex.");
2446
2447 r = sd_rtnl_message_link_get_type(message, &iftype);
2448 if (r < 0)
2449 return log_debug_errno(r, "rtnl: failed to read interface type from link message: %m");
2450
2451 r = sd_netlink_message_read_string_strdup(message, IFLA_IFNAME, &ifname);
2452 if (r < 0)
2453 return log_debug_errno(r, "rtnl: failed to read interface name from link message: %m");
2454
2455 /* check for link kind */
2456 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
2457 if (r >= 0) {
2458 r = sd_netlink_message_read_string_strdup(message, IFLA_INFO_KIND, &kind);
2459 if (r < 0 && r != -ENODATA)
2460 return log_debug_errno(r, "rtnl: failed to read interface kind from link message: %m");
2461 r = sd_netlink_message_exit_container(message);
2462 if (r < 0)
2463 return log_debug_errno(r, "rtnl: failed to exit IFLA_LINKINFO container: %m");
2464 }
2465
2466 if (!manager->test_mode) {
2467 /* Do not update state files when running in test mode. */
2468 if (asprintf(&state_file, "/run/systemd/netif/links/%d", ifindex) < 0)
2469 return log_oom_debug();
2470
2471 if (asprintf(&lease_file, "/run/systemd/netif/leases/%d", ifindex) < 0)
2472 return log_oom_debug();
2473
2474 if (asprintf(&lldp_file, "/run/systemd/netif/lldp/%d", ifindex) < 0)
2475 return log_oom_debug();
2476 }
2477
2478 link = new(Link, 1);
2479 if (!link)
2480 return -ENOMEM;
2481
2482 *link = (Link) {
2483 .n_ref = 1,
2484 .state = LINK_STATE_PENDING,
2485 .online_state = _LINK_ONLINE_STATE_INVALID,
2486 .ifindex = ifindex,
2487 .iftype = iftype,
2488 .ifname = TAKE_PTR(ifname),
2489 .kind = TAKE_PTR(kind),
2490
2491 .ipv6ll_address_gen_mode = _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_INVALID,
2492
2493 .state_file = TAKE_PTR(state_file),
2494 .lease_file = TAKE_PTR(lease_file),
2495 .lldp_file = TAKE_PTR(lldp_file),
2496
2497 .n_dns = UINT_MAX,
2498 .dns_default_route = -1,
2499 .llmnr = _RESOLVE_SUPPORT_INVALID,
2500 .mdns = _RESOLVE_SUPPORT_INVALID,
2501 .dnssec_mode = _DNSSEC_MODE_INVALID,
2502 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
2503 };
2504
2505 r = hashmap_ensure_put(&manager->links_by_index, NULL, INT_TO_PTR(link->ifindex), link);
2506 if (r < 0)
2507 return log_link_debug_errno(link, r, "Failed to store link into manager: %m");
2508
2509 link->manager = manager;
2510
2511 r = hashmap_ensure_put(&manager->links_by_name, &string_hash_ops, link->ifname, link);
2512 if (r < 0)
2513 return log_link_debug_errno(link, r, "Failed to manage link by its interface name: %m");
2514
2515 log_link_debug(link, "Saved new link: ifindex=%i, iftype=%s(%u), kind=%s",
2516 link->ifindex, strna(arphrd_to_name(link->iftype)), link->iftype, strna(link->kind));
2517
2518 *ret = TAKE_PTR(link);
2519 return 0;
2520 }
2521
2522 int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, Manager *manager) {
2523 Link *link = NULL;
2524 NetDev *netdev = NULL;
2525 uint16_t type;
2526 const char *name;
2527 int r, ifindex;
2528
2529 assert(rtnl);
2530 assert(message);
2531 assert(manager);
2532
2533 if (sd_netlink_message_is_error(message)) {
2534 r = sd_netlink_message_get_errno(message);
2535 if (r < 0)
2536 log_message_warning_errno(message, r, "rtnl: Could not receive link message, ignoring");
2537
2538 return 0;
2539 }
2540
2541 r = sd_netlink_message_get_type(message, &type);
2542 if (r < 0) {
2543 log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
2544 return 0;
2545 } else if (!IN_SET(type, RTM_NEWLINK, RTM_DELLINK)) {
2546 log_warning("rtnl: Received unexpected message type %u when processing link, ignoring.", type);
2547 return 0;
2548 }
2549
2550 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2551 if (r < 0) {
2552 log_warning_errno(r, "rtnl: Could not get ifindex from link message, ignoring: %m");
2553 return 0;
2554 } else if (ifindex <= 0) {
2555 log_warning("rtnl: received link message with invalid ifindex %d, ignoring.", ifindex);
2556 return 0;
2557 }
2558
2559 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
2560 if (r < 0) {
2561 log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
2562 return 0;
2563 }
2564
2565 (void) link_get_by_index(manager, ifindex, &link);
2566 (void) netdev_get(manager, name, &netdev);
2567
2568 switch (type) {
2569 case RTM_NEWLINK:
2570 if (netdev) {
2571 /* netdev exists, so make sure the ifindex matches */
2572 r = netdev_set_ifindex(netdev, message);
2573 if (r < 0) {
2574 log_netdev_warning_errno(netdev, r, "Could not process new link message for netdev, ignoring: %m");
2575 return 0;
2576 }
2577 }
2578
2579 if (!link) {
2580 /* link is new, so add it */
2581 r = link_new(manager, message, &link);
2582 if (r < 0) {
2583 log_warning_errno(r, "Could not process new link message: %m");
2584 return 0;
2585 }
2586
2587 r = link_update(link, message);
2588 if (r < 0) {
2589 log_link_warning_errno(link, r, "Could not process link message: %m");
2590 link_enter_failed(link);
2591 return 0;
2592 }
2593
2594 r = link_check_initialized(link);
2595 if (r < 0) {
2596 log_link_warning_errno(link, r, "Failed to check link is initialized: %m");
2597 link_enter_failed(link);
2598 return 0;
2599 }
2600 } else {
2601 r = link_update(link, message);
2602 if (r < 0) {
2603 log_link_warning_errno(link, r, "Could not process link message: %m");
2604 link_enter_failed(link);
2605 return 0;
2606 }
2607 if (r > 0) {
2608 r = link_reconfigure_impl(link, /* force = */ false);
2609 if (r < 0) {
2610 log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
2611 link_enter_failed(link);
2612 return 0;
2613 }
2614 }
2615 }
2616 break;
2617
2618 case RTM_DELLINK:
2619 link_drop(link);
2620 netdev_drop(netdev);
2621 break;
2622
2623 default:
2624 assert_not_reached();
2625 }
2626
2627 return 1;
2628 }
2629
2630 int link_getlink_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, const char *error_msg) {
2631 uint16_t message_type;
2632 int r;
2633
2634 assert(m);
2635 assert(link);
2636 assert(error_msg);
2637
2638 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2639 return 0;
2640
2641 r = sd_netlink_message_get_errno(m);
2642 if (r < 0) {
2643 log_link_message_warning_errno(link, m, r, error_msg);
2644 link_enter_failed(link);
2645 return 0;
2646 }
2647
2648 r = sd_netlink_message_get_type(m, &message_type);
2649 if (r < 0) {
2650 log_link_debug_errno(link, r, "rtnl: failed to read link message type, ignoring: %m");
2651 return 0;
2652 }
2653 if (message_type != RTM_NEWLINK) {
2654 log_link_debug(link, "rtnl: received invalid link message type, ignoring.");
2655 return 0;
2656 }
2657
2658 r = link_update(link, m);
2659 if (r < 0) {
2660 link_enter_failed(link);
2661 return 0;
2662 }
2663
2664 return 1;
2665 }
2666
2667 int link_call_getlink(Link *link, link_netlink_message_handler_t callback) {
2668 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2669 int r;
2670
2671 assert(link);
2672 assert(link->manager);
2673 assert(link->manager->rtnl);
2674 assert(callback);
2675
2676 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
2677 if (r < 0)
2678 return r;
2679
2680 r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
2681 link_netlink_destroy_callback, link);
2682 if (r < 0)
2683 return r;
2684
2685 link_ref(link);
2686 return 0;
2687 }
2688
2689 static const char* const link_state_table[_LINK_STATE_MAX] = {
2690 [LINK_STATE_PENDING] = "pending",
2691 [LINK_STATE_INITIALIZED] = "initialized",
2692 [LINK_STATE_CONFIGURING] = "configuring",
2693 [LINK_STATE_CONFIGURED] = "configured",
2694 [LINK_STATE_UNMANAGED] = "unmanaged",
2695 [LINK_STATE_FAILED] = "failed",
2696 [LINK_STATE_LINGER] = "linger",
2697 };
2698
2699 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
2700
2701 int link_flags_to_string_alloc(uint32_t flags, char **ret) {
2702 _cleanup_free_ char *str = NULL;
2703 static const char* map[] = {
2704 [LOG2U(IFF_UP)] = "up", /* interface is up. */
2705 [LOG2U(IFF_BROADCAST)] = "broadcast", /* broadcast address valid.*/
2706 [LOG2U(IFF_DEBUG)] = "debug", /* turn on debugging. */
2707 [LOG2U(IFF_LOOPBACK)] = "loopback", /* interface is a loopback net. */
2708 [LOG2U(IFF_POINTOPOINT)] = "point-to-point", /* interface has p-p link. */
2709 [LOG2U(IFF_NOTRAILERS)] = "no-trailers", /* avoid use of trailers. */
2710 [LOG2U(IFF_RUNNING)] = "running", /* interface RFC2863 OPER_UP. */
2711 [LOG2U(IFF_NOARP)] = "no-arp", /* no ARP protocol. */
2712 [LOG2U(IFF_PROMISC)] = "promiscuous", /* receive all packets. */
2713 [LOG2U(IFF_ALLMULTI)] = "all-multicast", /* receive all multicast packets. */
2714 [LOG2U(IFF_MASTER)] = "master", /* master of a load balancer. */
2715 [LOG2U(IFF_SLAVE)] = "slave", /* slave of a load balancer. */
2716 [LOG2U(IFF_MULTICAST)] = "multicast", /* supports multicast.*/
2717 [LOG2U(IFF_PORTSEL)] = "portsel", /* can set media type. */
2718 [LOG2U(IFF_AUTOMEDIA)] = "auto-media", /* auto media select active. */
2719 [LOG2U(IFF_DYNAMIC)] = "dynamic", /* dialup device with changing addresses. */
2720 [LOG2U(IFF_LOWER_UP)] = "lower-up", /* driver signals L1 up. */
2721 [LOG2U(IFF_DORMANT)] = "dormant", /* driver signals dormant. */
2722 [LOG2U(IFF_ECHO)] = "echo", /* echo sent packets. */
2723 };
2724
2725 assert(ret);
2726
2727 for (size_t i = 0; i < ELEMENTSOF(map); i++)
2728 if (FLAGS_SET(flags, 1 << i) && map[i])
2729 if (!strextend_with_separator(&str, ",", map[i]))
2730 return -ENOMEM;
2731
2732 *ret = TAKE_PTR(str);
2733 return 0;
2734 }
2735
2736 static const char * const kernel_operstate_table[] = {
2737 [IF_OPER_UNKNOWN] = "unknown",
2738 [IF_OPER_NOTPRESENT] = "not-present",
2739 [IF_OPER_DOWN] = "down",
2740 [IF_OPER_LOWERLAYERDOWN] = "lower-layer-down",
2741 [IF_OPER_TESTING] = "testing",
2742 [IF_OPER_DORMANT] = "dormant",
2743 [IF_OPER_UP] = "up",
2744 };
2745
2746 DEFINE_STRING_TABLE_LOOKUP_TO_STRING(kernel_operstate, int);
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