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Merge pull request #29523 from keszybz/kernel-install-dtb-files
[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-util.h"
56 #include "networkd-route.h"
57 #include "networkd-routing-policy-rule.h"
58 #include "networkd-setlink.h"
59 #include "networkd-sriov.h"
60 #include "networkd-state-file.h"
61 #include "networkd-sysctl.h"
62 #include "networkd-wifi.h"
63 #include "set.h"
64 #include "socket-util.h"
65 #include "stdio-util.h"
66 #include "string-table.h"
67 #include "strv.h"
68 #include "tc.h"
69 #include "tmpfile-util.h"
70 #include "tuntap.h"
71 #include "udev-util.h"
72 #include "vrf.h"
73
74 bool link_ipv6_enabled(Link *link) {
75 assert(link);
76
77 if (!socket_ipv6_is_supported())
78 return false;
79
80 if (link->iftype == ARPHRD_CAN)
81 return false;
82
83 if (!link->network)
84 return false;
85
86 if (link->network->bond)
87 return false;
88
89 if (link_may_have_ipv6ll(link, /* check_multicast = */ false))
90 return true;
91
92 if (network_has_static_ipv6_configurations(link->network))
93 return true;
94
95 return false;
96 }
97
98 bool link_has_ipv6_connectivity(Link *link) {
99 LinkAddressState ipv6_address_state;
100
101 assert(link);
102
103 link_get_address_states(link, NULL, &ipv6_address_state, NULL);
104
105 switch (ipv6_address_state) {
106 case LINK_ADDRESS_STATE_ROUTABLE:
107 /* If the interface has a routable IPv6 address, then we assume yes. */
108 return true;
109
110 case LINK_ADDRESS_STATE_DEGRADED:
111 /* If the interface has only degraded IPv6 address (mostly, link-local address), then let's check
112 * there is an IPv6 default gateway. */
113 return link_has_default_gateway(link, AF_INET6);
114
115 case LINK_ADDRESS_STATE_OFF:
116 /* No IPv6 address. */
117 return false;
118
119 default:
120 assert_not_reached();
121 }
122 }
123
124 static bool link_is_ready_to_configure_one(Link *link, bool allow_unmanaged) {
125 assert(link);
126
127 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED, LINK_STATE_UNMANAGED))
128 return false;
129
130 if (!link->network)
131 return allow_unmanaged;
132
133 if (!link->network->configure_without_carrier) {
134 if (link->set_flags_messages > 0)
135 return false;
136
137 if (!link_has_carrier(link))
138 return false;
139 }
140
141 if (link->set_link_messages > 0)
142 return false;
143
144 if (!link->activated)
145 return false;
146
147 return true;
148 }
149
150 bool link_is_ready_to_configure(Link *link, bool allow_unmanaged) {
151 return check_ready_for_all_sr_iov_ports(link, allow_unmanaged, link_is_ready_to_configure_one);
152 }
153
154 void link_ntp_settings_clear(Link *link) {
155 link->ntp = strv_free(link->ntp);
156 }
157
158 void link_dns_settings_clear(Link *link) {
159 if (link->n_dns != UINT_MAX)
160 for (unsigned i = 0; i < link->n_dns; i++)
161 in_addr_full_free(link->dns[i]);
162 link->dns = mfree(link->dns);
163 link->n_dns = UINT_MAX;
164
165 link->search_domains = ordered_set_free(link->search_domains);
166 link->route_domains = ordered_set_free(link->route_domains);
167
168 link->dns_default_route = -1;
169 link->llmnr = _RESOLVE_SUPPORT_INVALID;
170 link->mdns = _RESOLVE_SUPPORT_INVALID;
171 link->dnssec_mode = _DNSSEC_MODE_INVALID;
172 link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
173
174 link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
175 }
176
177 static void link_free_engines(Link *link) {
178 if (!link)
179 return;
180
181 link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
182
183 link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client);
184 link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
185 link->dhcp4_6rd_tunnel_name = mfree(link->dhcp4_6rd_tunnel_name);
186
187 link->lldp_rx = sd_lldp_rx_unref(link->lldp_rx);
188 link->lldp_tx = sd_lldp_tx_unref(link->lldp_tx);
189
190 link->ipv4acd_by_address = hashmap_free(link->ipv4acd_by_address);
191
192 link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
193
194 link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
195 link->dhcp6_lease = sd_dhcp6_lease_unref(link->dhcp6_lease);
196
197 link->ndisc = sd_ndisc_unref(link->ndisc);
198 link->ndisc_expire = sd_event_source_disable_unref(link->ndisc_expire);
199 ndisc_flush(link);
200
201 link->radv = sd_radv_unref(link->radv);
202 }
203
204 static Link *link_free(Link *link) {
205 assert(link);
206
207 link_ntp_settings_clear(link);
208 link_dns_settings_clear(link);
209
210 link->routes = set_free(link->routes);
211 link->nexthops = set_free(link->nexthops);
212 link->neighbors = set_free(link->neighbors);
213 link->addresses = set_free(link->addresses);
214 link->qdiscs = set_free(link->qdiscs);
215 link->tclasses = set_free(link->tclasses);
216
217 link->dhcp_pd_prefixes = set_free(link->dhcp_pd_prefixes);
218
219 link_free_engines(link);
220
221 set_free(link->sr_iov_virt_port_ifindices);
222 free(link->ifname);
223 strv_free(link->alternative_names);
224 free(link->kind);
225 free(link->ssid);
226 free(link->previous_ssid);
227 free(link->driver);
228
229 unlink_and_free(link->lease_file);
230 unlink_and_free(link->lldp_file);
231 unlink_and_free(link->state_file);
232
233 sd_device_unref(link->dev);
234 netdev_unref(link->netdev);
235
236 hashmap_free(link->bound_to_links);
237 hashmap_free(link->bound_by_links);
238
239 set_free_with_destructor(link->slaves, link_unref);
240
241 network_unref(link->network);
242
243 sd_event_source_disable_unref(link->carrier_lost_timer);
244
245 return mfree(link);
246 }
247
248 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
249
250 int link_get_by_index(Manager *m, int ifindex, Link **ret) {
251 Link *link;
252
253 assert(m);
254 assert(ifindex > 0);
255
256 link = hashmap_get(m->links_by_index, INT_TO_PTR(ifindex));
257 if (!link)
258 return -ENODEV;
259
260 if (ret)
261 *ret = link;
262 return 0;
263 }
264
265 int link_get_by_name(Manager *m, const char *ifname, Link **ret) {
266 Link *link;
267
268 assert(m);
269 assert(ifname);
270
271 link = hashmap_get(m->links_by_name, ifname);
272 if (!link)
273 return -ENODEV;
274
275 if (ret)
276 *ret = link;
277 return 0;
278 }
279
280 int link_get_by_hw_addr(Manager *m, const struct hw_addr_data *hw_addr, Link **ret) {
281 Link *link;
282
283 assert(m);
284 assert(hw_addr);
285
286 link = hashmap_get(m->links_by_hw_addr, hw_addr);
287 if (!link)
288 return -ENODEV;
289
290 if (ret)
291 *ret = link;
292 return 0;
293 }
294
295 int link_get_master(Link *link, Link **ret) {
296 assert(link);
297 assert(link->manager);
298 assert(ret);
299
300 if (link->master_ifindex <= 0 || link->master_ifindex == link->ifindex)
301 return -ENODEV;
302
303 return link_get_by_index(link->manager, link->master_ifindex, ret);
304 }
305
306 void link_set_state(Link *link, LinkState state) {
307 assert(link);
308
309 if (link->state == state)
310 return;
311
312 log_link_debug(link, "State changed: %s -> %s",
313 link_state_to_string(link->state),
314 link_state_to_string(state));
315
316 link->state = state;
317
318 link_send_changed(link, "AdministrativeState", NULL);
319 link_dirty(link);
320 }
321
322 int link_stop_engines(Link *link, bool may_keep_dhcp) {
323 int r = 0, k;
324
325 assert(link);
326 assert(link->manager);
327 assert(link->manager->event);
328
329 bool keep_dhcp = may_keep_dhcp &&
330 link->network &&
331 !link->network->dhcp_send_decline && /* IPv4 ACD for the DHCPv4 address is running. */
332 (link->manager->restarting ||
333 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
334
335 if (!keep_dhcp) {
336 k = sd_dhcp_client_stop(link->dhcp_client);
337 if (k < 0)
338 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
339 }
340
341 k = sd_dhcp_server_stop(link->dhcp_server);
342 if (k < 0)
343 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 server: %m");
344
345 k = sd_lldp_rx_stop(link->lldp_rx);
346 if (k < 0)
347 r = log_link_warning_errno(link, k, "Could not stop LLDP Rx: %m");
348
349 k = sd_lldp_tx_stop(link->lldp_tx);
350 if (k < 0)
351 r = log_link_warning_errno(link, k, "Could not stop LLDP Tx: %m");
352
353 k = sd_ipv4ll_stop(link->ipv4ll);
354 if (k < 0)
355 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
356
357 k = ipv4acd_stop(link);
358 if (k < 0)
359 r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client: %m");
360
361 k = sd_dhcp6_client_stop(link->dhcp6_client);
362 if (k < 0)
363 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
364
365 k = dhcp_pd_remove(link, /* only_marked = */ false);
366 if (k < 0)
367 r = log_link_warning_errno(link, k, "Could not remove DHCPv6 PD addresses and routes: %m");
368
369 k = ndisc_stop(link);
370 if (k < 0)
371 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
372
373 ndisc_flush(link);
374
375 k = sd_radv_stop(link->radv);
376 if (k < 0)
377 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
378
379 return r;
380 }
381
382 void link_enter_failed(Link *link) {
383 assert(link);
384
385 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
386 return;
387
388 log_link_warning(link, "Failed");
389
390 link_set_state(link, LINK_STATE_FAILED);
391
392 (void) link_stop_engines(link, false);
393 }
394
395 void link_check_ready(Link *link) {
396 Address *a;
397
398 assert(link);
399
400 if (link->state == LINK_STATE_CONFIGURED)
401 return;
402
403 if (link->state != LINK_STATE_CONFIGURING)
404 return (void) log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state));
405
406 if (!link->network)
407 return (void) log_link_debug(link, "%s(): link is unmanaged.", __func__);
408
409 if (!link->tc_configured)
410 return (void) log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
411
412 if (link->set_link_messages > 0)
413 return (void) log_link_debug(link, "%s(): link layer is configuring.", __func__);
414
415 if (!link->activated)
416 return (void) log_link_debug(link, "%s(): link is not activated.", __func__);
417
418 if (link->iftype == ARPHRD_CAN) {
419 /* let's shortcut things for CAN which doesn't need most of checks below. */
420 link_set_state(link, LINK_STATE_CONFIGURED);
421 return;
422 }
423
424 if (!link->stacked_netdevs_created)
425 return (void) log_link_debug(link, "%s(): stacked netdevs are not created.", __func__);
426
427 if (!link->static_addresses_configured)
428 return (void) log_link_debug(link, "%s(): static addresses are not configured.", __func__);
429
430 if (!link->static_address_labels_configured)
431 return (void) log_link_debug(link, "%s(): static address labels are not configured.", __func__);
432
433 if (!link->static_bridge_fdb_configured)
434 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
435
436 if (!link->static_bridge_mdb_configured)
437 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
438
439 if (!link->static_ipv6_proxy_ndp_configured)
440 return (void) log_link_debug(link, "%s(): static IPv6 proxy NDP addresses are not configured.", __func__);
441
442 if (!link->static_neighbors_configured)
443 return (void) log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
444
445 if (!link->static_nexthops_configured)
446 return (void) log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
447
448 if (!link->static_routes_configured)
449 return (void) log_link_debug(link, "%s(): static routes are not configured.", __func__);
450
451 if (!link->static_routing_policy_rules_configured)
452 return (void) log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
453
454 if (!link->sr_iov_configured)
455 return (void) log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
456
457 /* IPv6LL is assigned after the link gains its carrier. */
458 if (!link->network->configure_without_carrier &&
459 link_ipv6ll_enabled(link) &&
460 !in6_addr_is_set(&link->ipv6ll_address))
461 return (void) log_link_debug(link, "%s(): IPv6LL is not configured yet.", __func__);
462
463 /* All static addresses must be ready. */
464 bool has_static_address = false;
465 SET_FOREACH(a, link->addresses) {
466 if (a->source != NETWORK_CONFIG_SOURCE_STATIC)
467 continue;
468 if (!address_is_ready(a))
469 return (void) log_link_debug(link, "%s(): static address %s is not ready.", __func__,
470 IN_ADDR_PREFIX_TO_STRING(a->family, &a->in_addr, a->prefixlen));
471 has_static_address = true;
472 }
473
474 /* If at least one static address is requested, do not request that dynamic addressing protocols are finished. */
475 if (has_static_address)
476 goto ready;
477
478 /* If no dynamic addressing protocol enabled, assume the interface is ready.
479 * Note, ignore NDisc when ConfigureWithoutCarrier= is enabled, as IPv6AcceptRA= is enabled by default. */
480 if (!link_ipv4ll_enabled(link) && !link_dhcp4_enabled(link) &&
481 !link_dhcp6_enabled(link) && !link_dhcp_pd_is_enabled(link) &&
482 (link->network->configure_without_carrier || !link_ipv6_accept_ra_enabled(link)))
483 goto ready;
484
485 bool ipv4ll_ready =
486 link_ipv4ll_enabled(link) && link->ipv4ll_address_configured &&
487 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_IPV4LL);
488 bool dhcp4_ready =
489 link_dhcp4_enabled(link) && link->dhcp4_configured &&
490 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP4);
491 bool dhcp6_ready =
492 link_dhcp6_enabled(link) && link->dhcp6_configured &&
493 (!link->network->dhcp6_use_address ||
494 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP6));
495 bool dhcp_pd_ready =
496 link_dhcp_pd_is_enabled(link) && link->dhcp_pd_configured &&
497 (!link->network->dhcp_pd_assign ||
498 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP_PD));
499 bool ndisc_ready =
500 link_ipv6_accept_ra_enabled(link) && link->ndisc_configured &&
501 (!link->network->ipv6_accept_ra_use_autonomous_prefix ||
502 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_NDISC));
503
504 /* If the uplink for PD is self, then request the corresponding DHCP protocol is also ready. */
505 if (dhcp_pd_is_uplink(link, link, /* accept_auto = */ false)) {
506 if (link_dhcp4_enabled(link) && link->network->dhcp_use_6rd &&
507 sd_dhcp_lease_has_6rd(link->dhcp_lease)) {
508 if (!dhcp4_ready)
509 return (void) log_link_debug(link, "%s(): DHCPv4 6rd prefix is assigned, but DHCPv4 protocol is not finished yet.", __func__);
510 if (!dhcp_pd_ready)
511 return (void) log_link_debug(link, "%s(): DHCPv4 is finished, but prefix acquired by DHCPv4-6rd is not assigned yet.", __func__);
512 }
513
514 if (link_dhcp6_enabled(link) && link->network->dhcp6_use_pd_prefix &&
515 sd_dhcp6_lease_has_pd_prefix(link->dhcp6_lease)) {
516 if (!dhcp6_ready)
517 return (void) log_link_debug(link, "%s(): DHCPv6 IA_PD prefix is assigned, but DHCPv6 protocol is not finished yet.", __func__);
518 if (!dhcp_pd_ready)
519 return (void) log_link_debug(link, "%s(): DHCPv6 is finished, but prefix acquired by DHCPv6 IA_PD is not assigned yet.", __func__);
520 }
521 }
522
523 /* At least one dynamic addressing protocol is finished. */
524 if (!ipv4ll_ready && !dhcp4_ready && !dhcp6_ready && !dhcp_pd_ready && !ndisc_ready)
525 return (void) log_link_debug(link, "%s(): dynamic addressing protocols are enabled but none of them finished yet.", __func__);
526
527 log_link_debug(link, "%s(): IPv4LL:%s DHCPv4:%s DHCPv6:%s DHCP-PD:%s NDisc:%s",
528 __func__,
529 yes_no(ipv4ll_ready),
530 yes_no(dhcp4_ready),
531 yes_no(dhcp6_ready),
532 yes_no(dhcp_pd_ready),
533 yes_no(ndisc_ready));
534
535 ready:
536 link_set_state(link, LINK_STATE_CONFIGURED);
537 }
538
539 static int link_request_static_configs(Link *link) {
540 int r;
541
542 assert(link);
543 assert(link->network);
544 assert(link->state != _LINK_STATE_INVALID);
545
546 r = link_request_static_addresses(link);
547 if (r < 0)
548 return r;
549
550 r = link_request_static_address_labels(link);
551 if (r < 0)
552 return r;
553
554 r = link_request_static_bridge_fdb(link);
555 if (r < 0)
556 return r;
557
558 r = link_request_static_bridge_mdb(link);
559 if (r < 0)
560 return r;
561
562 r = link_request_static_ipv6_proxy_ndp_addresses(link);
563 if (r < 0)
564 return r;
565
566 r = link_request_static_neighbors(link);
567 if (r < 0)
568 return r;
569
570 r = link_request_static_nexthops(link, false);
571 if (r < 0)
572 return r;
573
574 r = link_request_static_routes(link, false);
575 if (r < 0)
576 return r;
577
578 r = link_request_static_routing_policy_rules(link);
579 if (r < 0)
580 return r;
581
582 return 0;
583 }
584
585 static int link_request_stacked_netdevs(Link *link) {
586 NetDev *netdev;
587 int r;
588
589 assert(link);
590
591 link->stacked_netdevs_created = false;
592
593 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) {
594 r = link_request_stacked_netdev(link, netdev);
595 if (r < 0)
596 return r;
597 }
598
599 if (link->create_stacked_netdev_messages == 0) {
600 link->stacked_netdevs_created = true;
601 link_check_ready(link);
602 }
603
604 return 0;
605 }
606
607 static int link_acquire_dynamic_ipv6_conf(Link *link) {
608 int r;
609
610 assert(link);
611
612 r = radv_start(link);
613 if (r < 0)
614 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Advertisement engine: %m");
615
616 r = ndisc_start(link);
617 if (r < 0)
618 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Discovery: %m");
619
620 r = dhcp6_start(link);
621 if (r < 0)
622 return log_link_warning_errno(link, r, "Failed to start DHCPv6 client: %m");
623
624 return 0;
625 }
626
627 static int link_acquire_dynamic_ipv4_conf(Link *link) {
628 int r;
629
630 assert(link);
631 assert(link->manager);
632 assert(link->manager->event);
633
634 if (link->dhcp_client) {
635 r = dhcp4_start(link);
636 if (r < 0)
637 return log_link_warning_errno(link, r, "Failed to start DHCPv4 client: %m");
638
639 log_link_debug(link, "Acquiring DHCPv4 lease.");
640
641 } else if (link->ipv4ll) {
642 if (in4_addr_is_set(&link->network->ipv4ll_start_address)) {
643 r = sd_ipv4ll_set_address(link->ipv4ll, &link->network->ipv4ll_start_address);
644 if (r < 0)
645 return log_link_warning_errno(link, r, "Could not set IPv4 link-local start address: %m");
646 }
647
648 r = sd_ipv4ll_start(link->ipv4ll);
649 if (r < 0)
650 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
651
652 log_link_debug(link, "Acquiring IPv4 link-local address.");
653 }
654
655 if (link->dhcp_server) {
656 r = sd_dhcp_server_start(link->dhcp_server);
657 if (r < 0)
658 return log_link_warning_errno(link, r, "Could not start DHCP server: %m");
659 }
660
661 r = ipv4acd_start(link);
662 if (r < 0)
663 return log_link_warning_errno(link, r, "Could not start IPv4 ACD client: %m");
664
665 return 0;
666 }
667
668 static int link_acquire_dynamic_conf(Link *link) {
669 int r;
670
671 assert(link);
672 assert(link->network);
673
674 r = link_acquire_dynamic_ipv4_conf(link);
675 if (r < 0)
676 return r;
677
678 if (in6_addr_is_set(&link->ipv6ll_address)) {
679 r = link_acquire_dynamic_ipv6_conf(link);
680 if (r < 0)
681 return r;
682 }
683
684 if (!link_radv_enabled(link) || !link->network->dhcp_pd_announce) {
685 /* DHCPv6PD downstream does not require IPv6LL address. But may require RADV to be
686 * configured, and RADV may not be configured yet here. Only acquire subnet prefix when
687 * RADV is disabled, or the announcement of the prefix is disabled. Otherwise, the
688 * below will be called in radv_start(). */
689 r = dhcp_request_prefix_delegation(link);
690 if (r < 0)
691 return log_link_warning_errno(link, r, "Failed to request DHCP delegated subnet prefix: %m");
692 }
693
694 if (link->lldp_tx) {
695 r = sd_lldp_tx_start(link->lldp_tx);
696 if (r < 0)
697 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
698 }
699
700 if (link->lldp_rx) {
701 r = sd_lldp_rx_start(link->lldp_rx);
702 if (r < 0)
703 return log_link_warning_errno(link, r, "Failed to start LLDP client: %m");
704 }
705
706 return 0;
707 }
708
709 int link_ipv6ll_gained(Link *link) {
710 int r;
711
712 assert(link);
713
714 log_link_info(link, "Gained IPv6LL");
715
716 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
717 return 0;
718
719 r = link_acquire_dynamic_ipv6_conf(link);
720 if (r < 0)
721 return r;
722
723 link_check_ready(link);
724 return 0;
725 }
726
727 int link_handle_bound_to_list(Link *link) {
728 bool required_up = false;
729 bool link_is_up = false;
730 Link *l;
731
732 assert(link);
733
734 /* If at least one interface in bound_to_links has carrier, then make this interface up.
735 * If all interfaces in bound_to_links do not, then make this interface down. */
736
737 if (hashmap_isempty(link->bound_to_links))
738 return 0;
739
740 if (link->flags & IFF_UP)
741 link_is_up = true;
742
743 HASHMAP_FOREACH(l, link->bound_to_links)
744 if (link_has_carrier(l)) {
745 required_up = true;
746 break;
747 }
748
749 if (!required_up && link_is_up)
750 return link_request_to_bring_up_or_down(link, /* up = */ false);
751 if (required_up && !link_is_up)
752 return link_request_to_bring_up_or_down(link, /* up = */ true);
753
754 return 0;
755 }
756
757 static int link_handle_bound_by_list(Link *link) {
758 Link *l;
759 int r;
760
761 assert(link);
762
763 /* Update up or down state of interfaces which depend on this interface's carrier state. */
764
765 if (hashmap_isempty(link->bound_by_links))
766 return 0;
767
768 HASHMAP_FOREACH(l, link->bound_by_links) {
769 r = link_handle_bound_to_list(l);
770 if (r < 0)
771 return r;
772 }
773
774 return 0;
775 }
776
777 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
778 int r;
779
780 assert(link);
781 assert(carrier);
782
783 if (link == carrier)
784 return 0;
785
786 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
787 return 0;
788
789 r = hashmap_ensure_put(h, NULL, INT_TO_PTR(carrier->ifindex), carrier);
790 if (r < 0)
791 return r;
792
793 link_dirty(link);
794
795 return 0;
796 }
797
798 static int link_new_bound_by_list(Link *link) {
799 Manager *m;
800 Link *carrier;
801 int r;
802
803 assert(link);
804 assert(link->manager);
805
806 m = link->manager;
807
808 HASHMAP_FOREACH(carrier, m->links_by_index) {
809 if (!carrier->network)
810 continue;
811
812 if (strv_isempty(carrier->network->bind_carrier))
813 continue;
814
815 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
816 r = link_put_carrier(link, carrier, &link->bound_by_links);
817 if (r < 0)
818 return r;
819 }
820 }
821
822 HASHMAP_FOREACH(carrier, link->bound_by_links) {
823 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
824 if (r < 0)
825 return r;
826 }
827
828 return 0;
829 }
830
831 static int link_new_bound_to_list(Link *link) {
832 Manager *m;
833 Link *carrier;
834 int r;
835
836 assert(link);
837 assert(link->manager);
838
839 if (!link->network)
840 return 0;
841
842 if (strv_isempty(link->network->bind_carrier))
843 return 0;
844
845 m = link->manager;
846
847 HASHMAP_FOREACH(carrier, m->links_by_index) {
848 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
849 r = link_put_carrier(link, carrier, &link->bound_to_links);
850 if (r < 0)
851 return r;
852 }
853 }
854
855 HASHMAP_FOREACH(carrier, link->bound_to_links) {
856 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
857 if (r < 0)
858 return r;
859 }
860
861 return 0;
862 }
863
864 static void link_free_bound_to_list(Link *link) {
865 bool updated = false;
866 Link *bound_to;
867
868 assert(link);
869
870 while ((bound_to = hashmap_steal_first(link->bound_to_links))) {
871 updated = true;
872
873 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
874 link_dirty(bound_to);
875 }
876
877 if (updated)
878 link_dirty(link);
879 }
880
881 static void link_free_bound_by_list(Link *link) {
882 bool updated = false;
883 Link *bound_by;
884
885 assert(link);
886
887 while ((bound_by = hashmap_steal_first(link->bound_by_links))) {
888 updated = true;
889
890 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
891 link_dirty(bound_by);
892 link_handle_bound_to_list(bound_by);
893 }
894 }
895
896 if (updated)
897 link_dirty(link);
898 }
899
900 static int link_append_to_master(Link *link) {
901 Link *master;
902 int r;
903
904 assert(link);
905
906 /* - The link may have no master.
907 * - RTM_NEWLINK message about master interface may not be received yet. */
908 if (link_get_master(link, &master) < 0)
909 return 0;
910
911 r = set_ensure_put(&master->slaves, NULL, link);
912 if (r <= 0)
913 return r;
914
915 link_ref(link);
916 return 0;
917 }
918
919 static void link_drop_from_master(Link *link) {
920 Link *master;
921
922 assert(link);
923
924 if (!link->manager)
925 return;
926
927 if (link_get_master(link, &master) < 0)
928 return;
929
930 link_unref(set_remove(master->slaves, link));
931 }
932
933 static void link_drop_requests(Link *link) {
934 Request *req;
935
936 assert(link);
937 assert(link->manager);
938
939 ORDERED_SET_FOREACH(req, link->manager->request_queue)
940 if (req->link == link)
941 request_detach(link->manager, req);
942 }
943
944 static Link *link_drop(Link *link) {
945 if (!link)
946 return NULL;
947
948 assert(link->manager);
949
950 link_set_state(link, LINK_STATE_LINGER);
951
952 /* Drop all references from other links and manager. Note that async netlink calls may have
953 * references to the link, and they will be dropped when we receive replies. */
954
955 link_drop_requests(link);
956
957 link_free_bound_to_list(link);
958 link_free_bound_by_list(link);
959
960 link_clear_sr_iov_ifindices(link);
961
962 link_drop_from_master(link);
963
964 if (link->state_file)
965 (void) unlink(link->state_file);
966
967 link_clean(link);
968
969 STRV_FOREACH(n, link->alternative_names)
970 hashmap_remove(link->manager->links_by_name, *n);
971 hashmap_remove(link->manager->links_by_name, link->ifname);
972
973 /* bonding master and its slaves have the same hardware address. */
974 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
975
976 /* The following must be called at last. */
977 assert_se(hashmap_remove(link->manager->links_by_index, INT_TO_PTR(link->ifindex)) == link);
978 return link_unref(link);
979 }
980
981 static int link_drop_foreign_config(Link *link) {
982 int r;
983
984 assert(link);
985 assert(link->manager);
986
987 /* Drop foreign config, but ignore unmanaged, loopback, or critical interfaces. We do not want
988 * to remove loopback address or addresses used for root NFS. */
989
990 if (IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
991 return 0;
992 if (FLAGS_SET(link->flags, IFF_LOOPBACK))
993 return 0;
994 if (link->network->keep_configuration == KEEP_CONFIGURATION_YES)
995 return 0;
996
997 r = link_drop_foreign_routes(link);
998
999 RET_GATHER(r, link_drop_foreign_nexthops(link));
1000 RET_GATHER(r, link_drop_foreign_addresses(link));
1001 RET_GATHER(r, link_drop_foreign_neighbors(link));
1002 RET_GATHER(r, manager_drop_foreign_routing_policy_rules(link->manager));
1003
1004 return r;
1005 }
1006
1007 static int link_drop_managed_config(Link *link) {
1008 int r;
1009
1010 assert(link);
1011 assert(link->manager);
1012
1013 r = link_drop_managed_routes(link);
1014
1015 RET_GATHER(r, link_drop_managed_nexthops(link));
1016 RET_GATHER(r, link_drop_managed_addresses(link));
1017 RET_GATHER(r, link_drop_managed_neighbors(link));
1018 RET_GATHER(r, link_drop_managed_routing_policy_rules(link));
1019
1020 return r;
1021 }
1022
1023 static void link_foreignize_config(Link *link) {
1024 assert(link);
1025 assert(link->manager);
1026
1027 link_foreignize_routes(link);
1028 link_foreignize_nexthops(link);
1029 link_foreignize_addresses(link);
1030 link_foreignize_neighbors(link);
1031 link_foreignize_routing_policy_rules(link);
1032 }
1033
1034 static int link_configure(Link *link) {
1035 int r;
1036
1037 assert(link);
1038 assert(link->network);
1039 assert(link->state == LINK_STATE_INITIALIZED);
1040
1041 link_set_state(link, LINK_STATE_CONFIGURING);
1042
1043 r = link_new_bound_to_list(link);
1044 if (r < 0)
1045 return r;
1046
1047 r = link_request_traffic_control(link);
1048 if (r < 0)
1049 return r;
1050
1051 if (link->iftype == ARPHRD_CAN) {
1052 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1053 r = link_request_to_set_can(link);
1054 if (r < 0)
1055 return r;
1056
1057 return link_request_to_activate(link);
1058 }
1059
1060 r = link_request_sr_iov_vfs(link);
1061 if (r < 0)
1062 return r;
1063
1064 r = link_set_sysctl(link);
1065 if (r < 0)
1066 return r;
1067
1068 r = link_request_to_set_mac(link, /* allow_retry = */ true);
1069 if (r < 0)
1070 return r;
1071
1072 r = link_request_to_set_ipoib(link);
1073 if (r < 0)
1074 return r;
1075
1076 r = link_request_to_set_flags(link);
1077 if (r < 0)
1078 return r;
1079
1080 r = link_request_to_set_group(link);
1081 if (r < 0)
1082 return r;
1083
1084 r = link_configure_mtu(link);
1085 if (r < 0)
1086 return r;
1087
1088 r = link_request_to_set_addrgen_mode(link);
1089 if (r < 0)
1090 return r;
1091
1092 r = link_request_to_set_master(link);
1093 if (r < 0)
1094 return r;
1095
1096 r = link_request_stacked_netdevs(link);
1097 if (r < 0)
1098 return r;
1099
1100 r = link_request_to_set_bond(link);
1101 if (r < 0)
1102 return r;
1103
1104 r = link_request_to_set_bridge(link);
1105 if (r < 0)
1106 return r;
1107
1108 r = link_request_to_set_bridge_vlan(link);
1109 if (r < 0)
1110 return r;
1111
1112 r = link_request_to_activate(link);
1113 if (r < 0)
1114 return r;
1115
1116 r = ipv4ll_configure(link);
1117 if (r < 0)
1118 return r;
1119
1120 r = link_request_dhcp4_client(link);
1121 if (r < 0)
1122 return r;
1123
1124 r = link_request_dhcp6_client(link);
1125 if (r < 0)
1126 return r;
1127
1128 r = link_request_ndisc(link);
1129 if (r < 0)
1130 return r;
1131
1132 r = link_request_dhcp_server(link);
1133 if (r < 0)
1134 return r;
1135
1136 r = link_request_radv(link);
1137 if (r < 0)
1138 return r;
1139
1140 r = link_lldp_rx_configure(link);
1141 if (r < 0)
1142 return r;
1143
1144 r = link_lldp_tx_configure(link);
1145 if (r < 0)
1146 return r;
1147
1148 r = link_drop_foreign_config(link);
1149 if (r < 0)
1150 return r;
1151
1152 r = link_request_static_configs(link);
1153 if (r < 0)
1154 return r;
1155
1156 if (!link_has_carrier(link))
1157 return 0;
1158
1159 return link_acquire_dynamic_conf(link);
1160 }
1161
1162 static int link_get_network(Link *link, Network **ret) {
1163 Network *network;
1164 int r;
1165
1166 assert(link);
1167 assert(link->manager);
1168 assert(ret);
1169
1170 ORDERED_HASHMAP_FOREACH(network, link->manager->networks) {
1171 bool warn = false;
1172
1173 r = net_match_config(
1174 &network->match,
1175 link->dev,
1176 &link->hw_addr,
1177 &link->permanent_hw_addr,
1178 link->driver,
1179 link->iftype,
1180 link->kind,
1181 link->ifname,
1182 link->alternative_names,
1183 link->wlan_iftype,
1184 link->ssid,
1185 &link->bssid);
1186 if (r < 0)
1187 return r;
1188 if (r == 0)
1189 continue;
1190
1191 if (network->match.ifname && link->dev) {
1192 uint8_t name_assign_type = NET_NAME_UNKNOWN;
1193 const char *attr;
1194
1195 if (sd_device_get_sysattr_value(link->dev, "name_assign_type", &attr) >= 0)
1196 (void) safe_atou8(attr, &name_assign_type);
1197
1198 warn = name_assign_type == NET_NAME_ENUM;
1199 }
1200
1201 log_link_full(link, warn ? LOG_WARNING : LOG_DEBUG,
1202 "found matching network '%s'%s.",
1203 network->filename,
1204 warn ? ", based on potentially unpredictable interface name" : "");
1205
1206 if (network->unmanaged)
1207 return -ENOENT;
1208
1209 *ret = network;
1210 return 0;
1211 }
1212
1213 return -ENOENT;
1214 }
1215
1216 int link_reconfigure_impl(Link *link, bool force) {
1217 Network *network = NULL;
1218 NetDev *netdev = NULL;
1219 int r;
1220
1221 assert(link);
1222
1223 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
1224 return 0;
1225
1226 r = netdev_get(link->manager, link->ifname, &netdev);
1227 if (r < 0 && r != -ENOENT)
1228 return r;
1229
1230 r = link_get_network(link, &network);
1231 if (r < 0 && r != -ENOENT)
1232 return r;
1233
1234 if (link->state != LINK_STATE_UNMANAGED && !network)
1235 /* If link is in initialized state, then link->network is also NULL. */
1236 force = true;
1237
1238 if (link->network == network && !force)
1239 return 0;
1240
1241 if (network) {
1242 if (link->state == LINK_STATE_INITIALIZED)
1243 log_link_info(link, "Configuring with %s.", network->filename);
1244 else
1245 log_link_info(link, "Reconfiguring with %s.", network->filename);
1246 } else
1247 log_link_full(link, link->state == LINK_STATE_INITIALIZED ? LOG_DEBUG : LOG_INFO,
1248 "Unmanaging interface.");
1249
1250 /* Dropping old .network file */
1251 r = link_stop_engines(link, false);
1252 if (r < 0)
1253 return r;
1254
1255 link_drop_requests(link);
1256
1257 if (network && !force && network->keep_configuration != KEEP_CONFIGURATION_YES)
1258 /* When a new/updated .network file is assigned, first make all configs (addresses,
1259 * routes, and so on) foreign, and then drop unnecessary configs later by
1260 * link_drop_foreign_config() in link_configure().
1261 * Note, when KeepConfiguration=yes, link_drop_foreign_config() does nothing. Hence,
1262 * here we need to drop the configs such as addresses, routes, and so on configured by
1263 * the previously assigned .network file. */
1264 link_foreignize_config(link);
1265 else {
1266 /* Remove all managed configs. Note, foreign configs are removed in later by
1267 * link_configure() -> link_drop_foreign_config() if the link is managed by us. */
1268 r = link_drop_managed_config(link);
1269 if (r < 0)
1270 return r;
1271 }
1272
1273 /* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the
1274 * bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will
1275 * not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the
1276 * map here, as it depends on .network files assigned to other links. */
1277 link_free_bound_to_list(link);
1278
1279 link_free_engines(link);
1280 link->network = network_unref(link->network);
1281
1282 netdev_unref(link->netdev);
1283 link->netdev = netdev_ref(netdev);
1284
1285 if (!network) {
1286 link_set_state(link, LINK_STATE_UNMANAGED);
1287 return 0;
1288 }
1289
1290 /* Then, apply new .network file */
1291 link->network = network_ref(network);
1292 link_update_operstate(link, true);
1293 link_dirty(link);
1294
1295 link_set_state(link, LINK_STATE_INITIALIZED);
1296 link->activated = false;
1297
1298 r = link_configure(link);
1299 if (r < 0)
1300 return r;
1301
1302 return 1;
1303 }
1304
1305 static int link_reconfigure_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, bool force) {
1306 int r;
1307
1308 assert(link);
1309
1310 r = link_getlink_handler_internal(rtnl, m, link, "Failed to update link state");
1311 if (r <= 0)
1312 return r;
1313
1314 r = link_reconfigure_impl(link, force);
1315 if (r < 0) {
1316 link_enter_failed(link);
1317 return 0;
1318 }
1319
1320 return r;
1321 }
1322
1323 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1324 return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ false);
1325 }
1326
1327 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1328 return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ true);
1329 }
1330
1331 int link_reconfigure(Link *link, bool force) {
1332 int r;
1333
1334 assert(link);
1335
1336 /* When link in pending or initialized state, then link_configure() will be called. To prevent
1337 * the function from being called multiple times simultaneously, refuse to reconfigure the
1338 * interface in these cases. */
1339 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
1340 return 0; /* 0 means no-op. */
1341
1342 r = link_call_getlink(link, force ? link_force_reconfigure_handler : link_reconfigure_handler);
1343 if (r < 0)
1344 return r;
1345
1346 return 1; /* 1 means the interface will be reconfigured. */
1347 }
1348
1349 static int link_initialized_and_synced(Link *link) {
1350 int r;
1351
1352 assert(link);
1353 assert(link->manager);
1354
1355 if (link->manager->test_mode) {
1356 log_link_debug(link, "Running in test mode, refusing to enter initialized state.");
1357 link_set_state(link, LINK_STATE_UNMANAGED);
1358 return 0;
1359 }
1360
1361 if (link->state == LINK_STATE_PENDING) {
1362 log_link_debug(link, "Link state is up-to-date");
1363 link_set_state(link, LINK_STATE_INITIALIZED);
1364
1365 r = link_new_bound_by_list(link);
1366 if (r < 0)
1367 return r;
1368
1369 r = link_handle_bound_by_list(link);
1370 if (r < 0)
1371 return r;
1372 }
1373
1374 return link_reconfigure_impl(link, /* force = */ false);
1375 }
1376
1377 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1378 int r;
1379
1380 r = link_getlink_handler_internal(rtnl, m, link, "Failed to wait for the interface to be initialized");
1381 if (r <= 0)
1382 return r;
1383
1384 r = link_initialized_and_synced(link);
1385 if (r < 0)
1386 link_enter_failed(link);
1387
1388 return 0;
1389 }
1390
1391 static int link_initialized(Link *link, sd_device *device) {
1392 int r;
1393
1394 assert(link);
1395 assert(device);
1396
1397 /* Always replace with the new sd_device object. As the sysname (and possibly other properties
1398 * or sysattrs) may be outdated. */
1399 device_unref_and_replace(link->dev, device);
1400
1401 if (link->dhcp_client) {
1402 r = sd_dhcp_client_attach_device(link->dhcp_client, link->dev);
1403 if (r < 0)
1404 log_link_warning_errno(link, r, "Failed to attach device to DHCPv4 client, ignoring: %m");
1405 }
1406
1407 if (link->dhcp6_client) {
1408 r = sd_dhcp6_client_attach_device(link->dhcp6_client, link->dev);
1409 if (r < 0)
1410 log_link_warning_errno(link, r, "Failed to attach device to DHCPv6 client, ignoring: %m");
1411 }
1412
1413 r = link_set_sr_iov_ifindices(link);
1414 if (r < 0)
1415 log_link_warning_errno(link, r, "Failed to manage SR-IOV PF and VF ports, ignoring: %m");
1416
1417 if (link->state != LINK_STATE_PENDING)
1418 return link_reconfigure(link, /* force = */ false);
1419
1420 log_link_debug(link, "udev initialized link");
1421
1422 /* udev has initialized the link, but we don't know if we have yet
1423 * processed the NEWLINK messages with the latest state. Do a GETLINK,
1424 * when it returns we know that the pending NEWLINKs have already been
1425 * processed and that we are up-to-date */
1426
1427 return link_call_getlink(link, link_initialized_handler);
1428 }
1429
1430 static int link_check_initialized(Link *link) {
1431 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
1432 int r;
1433
1434 assert(link);
1435
1436 if (!udev_available())
1437 return link_initialized_and_synced(link);
1438
1439 /* udev should be around */
1440 r = sd_device_new_from_ifindex(&device, link->ifindex);
1441 if (r < 0) {
1442 log_link_debug_errno(link, r, "Could not find device, waiting for device initialization: %m");
1443 return 0;
1444 }
1445
1446 r = sd_device_get_is_initialized(device);
1447 if (r < 0)
1448 return log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
1449 if (r == 0) {
1450 /* not yet ready */
1451 log_link_debug(link, "link pending udev initialization...");
1452 return 0;
1453 }
1454
1455 r = device_is_renaming(device);
1456 if (r < 0)
1457 return log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
1458 if (r > 0) {
1459 log_link_debug(link, "Interface is being renamed, pending initialization.");
1460 return 0;
1461 }
1462
1463 return link_initialized(link, device);
1464 }
1465
1466 int manager_udev_process_link(Manager *m, sd_device *device, sd_device_action_t action) {
1467 int r, ifindex;
1468 Link *link;
1469
1470 assert(m);
1471 assert(device);
1472
1473 r = sd_device_get_ifindex(device, &ifindex);
1474 if (r < 0)
1475 return log_device_debug_errno(device, r, "Failed to get ifindex: %m");
1476
1477 r = link_get_by_index(m, ifindex, &link);
1478 if (r < 0) {
1479 /* This error is not critical, as the corresponding rtnl message may be received later. */
1480 log_device_debug_errno(device, r, "Failed to get link from ifindex %i, ignoring: %m", ifindex);
1481 return 0;
1482 }
1483
1484 /* Let's unref the sd-device object assigned to the corresponding Link object, but keep the Link
1485 * object here. It will be removed only when rtnetlink says so. */
1486 if (action == SD_DEVICE_REMOVE) {
1487 link->dev = sd_device_unref(link->dev);
1488 return 0;
1489 }
1490
1491 r = device_is_renaming(device);
1492 if (r < 0)
1493 return log_device_debug_errno(device, r, "Failed to determine if the device is renaming or not: %m");
1494 if (r > 0) {
1495 log_device_debug(device, "Device is renaming, waiting for the interface to be renamed.");
1496 /* TODO:
1497 * What happens when a device is initialized, then soon renamed after that? When we detect
1498 * such, maybe we should cancel or postpone all queued requests for the interface. */
1499 return 0;
1500 }
1501
1502 r = link_initialized(link, device);
1503 if (r < 0)
1504 link_enter_failed(link);
1505
1506 return 0;
1507 }
1508
1509 static int link_carrier_gained(Link *link) {
1510 bool force_reconfigure;
1511 int r;
1512
1513 assert(link);
1514
1515 r = event_source_disable(link->carrier_lost_timer);
1516 if (r < 0)
1517 log_link_warning_errno(link, r, "Failed to disable carrier lost timer, ignoring: %m");
1518
1519 /* If a wireless interface was connected to an access point, and the SSID is changed (that is,
1520 * both previous_ssid and ssid are non-NULL), then the connected wireless network could be
1521 * changed. So, always reconfigure the link. Which means e.g. the DHCP client will be
1522 * restarted, and the correct network information will be gained.
1523 *
1524 * However, do not reconfigure the wireless interface forcibly if it was not connected to any
1525 * access points previously (previous_ssid is NULL in this case). As, a .network file may be
1526 * already assigned to the interface (in that case, the .network file does not have the SSID=
1527 * setting in the [Match] section), and the interface is already being configured. Of course,
1528 * there may exist another .network file with higher priority and a matching SSID= setting. But
1529 * in that case, link_reconfigure_impl() can handle that without the force_reconfigure flag.
1530 *
1531 * For non-wireless interfaces, we have no way to detect the connected network change. So,
1532 * setting force_reconfigure = false. Note, both ssid and previous_ssid are NULL in that case. */
1533 force_reconfigure = link->previous_ssid && !streq_ptr(link->previous_ssid, link->ssid);
1534 link->previous_ssid = mfree(link->previous_ssid);
1535
1536 /* AP and P2P-GO interfaces may have a new SSID - update the link properties in case a new .network
1537 * profile wants to match on it with SSID= in its [Match] section.
1538 */
1539 if (IN_SET(link->wlan_iftype, NL80211_IFTYPE_AP, NL80211_IFTYPE_P2P_GO)) {
1540 r = link_get_wlan_interface(link);
1541 if (r < 0)
1542 return r;
1543 }
1544
1545 /* At this stage, both wlan and link information should be up-to-date. Hence, it is not necessary to
1546 * call RTM_GETLINK, NL80211_CMD_GET_INTERFACE, or NL80211_CMD_GET_STATION commands, and simply call
1547 * link_reconfigure_impl(). Note, link_reconfigure_impl() returns 1 when the link is reconfigured. */
1548 r = link_reconfigure_impl(link, force_reconfigure);
1549 if (r != 0)
1550 return r;
1551
1552 r = link_handle_bound_by_list(link);
1553 if (r < 0)
1554 return r;
1555
1556 if (link->iftype == ARPHRD_CAN)
1557 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1558 return 0;
1559
1560 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
1561 r = link_acquire_dynamic_conf(link);
1562 if (r < 0)
1563 return r;
1564
1565 r = link_request_static_configs(link);
1566 if (r < 0)
1567 return r;
1568 }
1569
1570 return 0;
1571 }
1572
1573 static int link_carrier_lost_impl(Link *link) {
1574 int r, ret = 0;
1575
1576 assert(link);
1577
1578 link->previous_ssid = mfree(link->previous_ssid);
1579
1580 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1581 return 0;
1582
1583 if (!link->network)
1584 return 0;
1585
1586 r = link_stop_engines(link, false);
1587 if (r < 0)
1588 ret = r;
1589
1590 r = link_drop_managed_config(link);
1591 if (r < 0 && ret >= 0)
1592 ret = r;
1593
1594 return ret;
1595 }
1596
1597 static int link_carrier_lost_handler(sd_event_source *s, uint64_t usec, void *userdata) {
1598 Link *link = ASSERT_PTR(userdata);
1599 int r;
1600
1601 r = link_carrier_lost_impl(link);
1602 if (r < 0) {
1603 log_link_warning_errno(link, r, "Failed to process carrier lost event: %m");
1604 link_enter_failed(link);
1605 }
1606
1607 return 0;
1608 }
1609
1610 static int link_carrier_lost(Link *link) {
1611 uint16_t dhcp_mtu;
1612 usec_t usec;
1613 int r;
1614
1615 assert(link);
1616
1617 r = link_handle_bound_by_list(link);
1618 if (r < 0)
1619 return r;
1620
1621 if (link->iftype == ARPHRD_CAN)
1622 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1623 return 0;
1624
1625 if (!link->network)
1626 return 0;
1627
1628 if (link->network->ignore_carrier_loss_set)
1629 /* If IgnoreCarrierLoss= is explicitly specified, then use the specified value. */
1630 usec = link->network->ignore_carrier_loss_usec;
1631
1632 else if (link->network->bond && link->wlan_iftype > 0)
1633 /* Enslaving wlan interface to a bond disconnects from the connected AP, and causes its
1634 * carrier to be lost. See #19832. */
1635 usec = 3 * USEC_PER_SEC;
1636
1637 else if (link->network->dhcp_use_mtu &&
1638 link->dhcp_lease &&
1639 sd_dhcp_lease_get_mtu(link->dhcp_lease, &dhcp_mtu) >= 0 &&
1640 dhcp_mtu != link->original_mtu)
1641 /* Some drivers reset interfaces when changing MTU. Resetting interfaces by the static
1642 * MTU should not cause any issues, as MTU is changed only once. However, setting MTU
1643 * through DHCP lease causes an infinite loop of resetting the interface. See #18738. */
1644 usec = 5 * USEC_PER_SEC;
1645
1646 else
1647 /* Otherwise, use the currently set value. */
1648 usec = link->network->ignore_carrier_loss_usec;
1649
1650 if (usec == USEC_INFINITY)
1651 return 0;
1652
1653 if (usec == 0)
1654 return link_carrier_lost_impl(link);
1655
1656 return event_reset_time_relative(link->manager->event,
1657 &link->carrier_lost_timer,
1658 CLOCK_BOOTTIME,
1659 usec,
1660 0,
1661 link_carrier_lost_handler,
1662 link,
1663 0,
1664 "link-carrier-loss",
1665 true);
1666 }
1667
1668 static int link_admin_state_up(Link *link) {
1669 int r;
1670
1671 assert(link);
1672
1673 /* This is called every time an interface admin state changes to up;
1674 * specifically, when IFF_UP flag changes from unset to set. */
1675
1676 if (!link->network)
1677 return 0;
1678
1679 if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_DOWN) {
1680 log_link_info(link, "Activation policy is \"always-down\", forcing link down.");
1681 return link_request_to_bring_up_or_down(link, /* up = */ false);
1682 }
1683
1684 /* We set the ipv6 mtu after the device mtu, but the kernel resets
1685 * ipv6 mtu on NETDEV_UP, so we need to reset it. */
1686 r = link_set_ipv6_mtu(link);
1687 if (r < 0)
1688 log_link_warning_errno(link, r, "Cannot set IPv6 MTU, ignoring: %m");
1689
1690 return 0;
1691 }
1692
1693 static int link_admin_state_down(Link *link) {
1694 assert(link);
1695
1696 if (!link->network)
1697 return 0;
1698
1699 if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) {
1700 log_link_info(link, "Activation policy is \"always-up\", forcing link up.");
1701 return link_request_to_bring_up_or_down(link, /* up = */ true);
1702 }
1703
1704 return 0;
1705 }
1706
1707 static bool link_is_enslaved(Link *link) {
1708 if (link->flags & IFF_SLAVE)
1709 return true;
1710
1711 if (link->master_ifindex > 0)
1712 return true;
1713
1714 return false;
1715 }
1716
1717 void link_update_operstate(Link *link, bool also_update_master) {
1718 LinkOperationalState operstate;
1719 LinkCarrierState carrier_state;
1720 LinkAddressState ipv4_address_state, ipv6_address_state, address_state;
1721 LinkOnlineState online_state;
1722 _cleanup_strv_free_ char **p = NULL;
1723 bool changed = false;
1724
1725 assert(link);
1726
1727 if (link->kernel_operstate == IF_OPER_DORMANT)
1728 carrier_state = LINK_CARRIER_STATE_DORMANT;
1729 else if (link_has_carrier(link)) {
1730 if (link_is_enslaved(link))
1731 carrier_state = LINK_CARRIER_STATE_ENSLAVED;
1732 else
1733 carrier_state = LINK_CARRIER_STATE_CARRIER;
1734 } else if (link->flags & IFF_UP)
1735 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
1736 else
1737 carrier_state = LINK_CARRIER_STATE_OFF;
1738
1739 if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
1740 Link *slave;
1741
1742 SET_FOREACH(slave, link->slaves) {
1743 link_update_operstate(slave, false);
1744
1745 if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
1746 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
1747 }
1748 }
1749
1750 link_get_address_states(link, &ipv4_address_state, &ipv6_address_state, &address_state);
1751
1752 /* Mapping of address and carrier state vs operational state
1753 * carrier state
1754 * | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
1755 * ------------------------------------------------------------------------------
1756 * off | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
1757 * address_state degraded | off | no-carrier | dormant | degraded | degraded | enslaved
1758 * routable | off | no-carrier | dormant | routable | routable | routable
1759 */
1760
1761 if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_ROUTABLE)
1762 operstate = LINK_OPERSTATE_ROUTABLE;
1763 else if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_DEGRADED)
1764 operstate = LINK_OPERSTATE_DEGRADED;
1765 else if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
1766 operstate = (LinkOperationalState) carrier_state;
1767 else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
1768 operstate = LINK_OPERSTATE_ROUTABLE;
1769 else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
1770 operstate = LINK_OPERSTATE_DEGRADED;
1771 else
1772 operstate = LINK_OPERSTATE_ENSLAVED;
1773
1774 /* Only determine online state for managed links with RequiredForOnline=yes */
1775 if (!link->network || !link->network->required_for_online)
1776 online_state = _LINK_ONLINE_STATE_INVALID;
1777 else if (operstate < link->network->required_operstate_for_online.min ||
1778 operstate > link->network->required_operstate_for_online.max)
1779 online_state = LINK_ONLINE_STATE_OFFLINE;
1780 else {
1781 AddressFamily required_family = link->network->required_family_for_online;
1782 bool needs_ipv4 = required_family & ADDRESS_FAMILY_IPV4;
1783 bool needs_ipv6 = required_family & ADDRESS_FAMILY_IPV6;
1784
1785 /* The operational state is within the range required for online.
1786 * If a particular address family is also required, we might revert
1787 * to offline in the blocks below. */
1788 online_state = LINK_ONLINE_STATE_ONLINE;
1789
1790 if (link->network->required_operstate_for_online.min >= LINK_OPERSTATE_DEGRADED) {
1791 if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_DEGRADED)
1792 online_state = LINK_ONLINE_STATE_OFFLINE;
1793 if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_DEGRADED)
1794 online_state = LINK_ONLINE_STATE_OFFLINE;
1795 }
1796
1797 if (link->network->required_operstate_for_online.min >= LINK_OPERSTATE_ROUTABLE) {
1798 if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1799 online_state = LINK_ONLINE_STATE_OFFLINE;
1800 if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1801 online_state = LINK_ONLINE_STATE_OFFLINE;
1802 }
1803 }
1804
1805 if (link->carrier_state != carrier_state) {
1806 link->carrier_state = carrier_state;
1807 changed = true;
1808 if (strv_extend(&p, "CarrierState") < 0)
1809 log_oom();
1810 }
1811
1812 if (link->address_state != address_state) {
1813 link->address_state = address_state;
1814 changed = true;
1815 if (strv_extend(&p, "AddressState") < 0)
1816 log_oom();
1817 }
1818
1819 if (link->ipv4_address_state != ipv4_address_state) {
1820 link->ipv4_address_state = ipv4_address_state;
1821 changed = true;
1822 if (strv_extend(&p, "IPv4AddressState") < 0)
1823 log_oom();
1824 }
1825
1826 if (link->ipv6_address_state != ipv6_address_state) {
1827 link->ipv6_address_state = ipv6_address_state;
1828 changed = true;
1829 if (strv_extend(&p, "IPv6AddressState") < 0)
1830 log_oom();
1831 }
1832
1833 if (link->operstate != operstate) {
1834 link->operstate = operstate;
1835 changed = true;
1836 if (strv_extend(&p, "OperationalState") < 0)
1837 log_oom();
1838 }
1839
1840 if (link->online_state != online_state) {
1841 link->online_state = online_state;
1842 changed = true;
1843 if (strv_extend(&p, "OnlineState") < 0)
1844 log_oom();
1845 }
1846
1847 if (p)
1848 link_send_changed_strv(link, p);
1849 if (changed)
1850 link_dirty(link);
1851
1852 if (also_update_master) {
1853 Link *master;
1854
1855 if (link_get_master(link, &master) >= 0)
1856 link_update_operstate(master, true);
1857 }
1858 }
1859
1860 #define FLAG_STRING(string, flag, old, new) \
1861 (((old ^ new) & flag) \
1862 ? ((old & flag) ? (" -" string) : (" +" string)) \
1863 : "")
1864
1865 static int link_update_flags(Link *link, sd_netlink_message *message) {
1866 bool link_was_admin_up, had_carrier;
1867 uint8_t operstate;
1868 unsigned flags;
1869 int r;
1870
1871 assert(link);
1872 assert(message);
1873
1874 r = sd_rtnl_message_link_get_flags(message, &flags);
1875 if (r < 0)
1876 return log_link_debug_errno(link, r, "rtnl: failed to read link flags: %m");
1877
1878 r = sd_netlink_message_read_u8(message, IFLA_OPERSTATE, &operstate);
1879 if (r == -ENODATA)
1880 /* If we got a message without operstate, assume the state was unchanged. */
1881 operstate = link->kernel_operstate;
1882 else if (r < 0)
1883 return log_link_debug_errno(link, r, "rtnl: failed to read operational state: %m");
1884
1885 if (link->flags == flags && link->kernel_operstate == operstate)
1886 return 0;
1887
1888 if (link->flags != flags) {
1889 unsigned unknown_flags, unknown_flags_added, unknown_flags_removed;
1890
1891 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",
1892 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
1893 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
1894 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
1895 FLAG_STRING("UP", IFF_UP, link->flags, flags),
1896 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
1897 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
1898 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
1899 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
1900 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
1901 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
1902 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
1903 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
1904 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
1905 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
1906 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
1907 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
1908 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
1909 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
1910 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
1911
1912 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
1913 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
1914 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
1915 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
1916 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
1917 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
1918 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
1919 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
1920
1921 if (unknown_flags_added)
1922 log_link_debug(link, "Unknown link flags gained, ignoring: %#.5x", unknown_flags_added);
1923
1924 if (unknown_flags_removed)
1925 log_link_debug(link, "Unknown link flags lost, ignoring: %#.5x", unknown_flags_removed);
1926 }
1927
1928 link_was_admin_up = link->flags & IFF_UP;
1929 had_carrier = link_has_carrier(link);
1930
1931 link->flags = flags;
1932 link->kernel_operstate = operstate;
1933
1934 link_update_operstate(link, true);
1935
1936 if (!link_was_admin_up && (link->flags & IFF_UP)) {
1937 log_link_info(link, "Link UP");
1938
1939 r = link_admin_state_up(link);
1940 if (r < 0)
1941 return r;
1942 } else if (link_was_admin_up && !(link->flags & IFF_UP)) {
1943 log_link_info(link, "Link DOWN");
1944
1945 r = link_admin_state_down(link);
1946 if (r < 0)
1947 return r;
1948 }
1949
1950 if (!had_carrier && link_has_carrier(link)) {
1951 log_link_info(link, "Gained carrier");
1952
1953 r = link_carrier_gained(link);
1954 if (r < 0)
1955 return r;
1956 } else if (had_carrier && !link_has_carrier(link)) {
1957 log_link_info(link, "Lost carrier");
1958
1959 r = link_carrier_lost(link);
1960 if (r < 0)
1961 return r;
1962 }
1963
1964 return 0;
1965 }
1966
1967 static int link_update_master(Link *link, sd_netlink_message *message) {
1968 int master_ifindex, r;
1969
1970 assert(link);
1971 assert(message);
1972
1973 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t*) &master_ifindex);
1974 if (r == -ENODATA)
1975 return 0;
1976 if (r < 0)
1977 return log_link_debug_errno(link, r, "rtnl: failed to read master ifindex: %m");
1978
1979 if (master_ifindex == link->ifindex)
1980 master_ifindex = 0;
1981
1982 if (master_ifindex == link->master_ifindex)
1983 return 0;
1984
1985 if (link->master_ifindex == 0)
1986 log_link_debug(link, "Attached to master interface: %i", master_ifindex);
1987 else if (master_ifindex == 0)
1988 log_link_debug(link, "Detached from master interface: %i", link->master_ifindex);
1989 else
1990 log_link_debug(link, "Master interface changed: %i %s %i", link->master_ifindex,
1991 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), master_ifindex);
1992
1993 link_drop_from_master(link);
1994
1995 link->master_ifindex = master_ifindex;
1996
1997 r = link_append_to_master(link);
1998 if (r < 0)
1999 return log_link_debug_errno(link, r, "Failed to append link to master: %m");
2000
2001 return 0;
2002 }
2003
2004 static int link_update_driver(Link *link, sd_netlink_message *message) {
2005 int r;
2006
2007 assert(link);
2008 assert(link->manager);
2009 assert(message);
2010
2011 /* Driver is already read. Assuming the driver is never changed. */
2012 if (link->ethtool_driver_read)
2013 return 0;
2014
2015 /* When udevd is running, read the driver after the interface is initialized by udevd.
2016 * Otherwise, ethtool may not work correctly. See issue #22538.
2017 * When udevd is not running, read the value when the interface is detected. */
2018 if (udev_available() && !link->dev)
2019 return 0;
2020
2021 link->ethtool_driver_read = true;
2022
2023 r = ethtool_get_driver(&link->manager->ethtool_fd, link->ifname, &link->driver);
2024 if (r < 0) {
2025 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
2026 return 0;
2027 }
2028
2029 log_link_debug(link, "Found driver: %s", strna(link->driver));
2030
2031 if (streq_ptr(link->driver, "dsa")) {
2032 uint32_t dsa_master_ifindex = 0;
2033
2034 r = sd_netlink_message_read_u32(message, IFLA_LINK, &dsa_master_ifindex);
2035 if (r < 0 && r != -ENODATA)
2036 return log_link_debug_errno(link, r, "rtnl: failed to read ifindex of the DSA master interface: %m");
2037
2038 if (dsa_master_ifindex > INT_MAX) {
2039 log_link_debug(link, "rtnl: received too large DSA master ifindex (%"PRIu32" > INT_MAX), ignoring.",
2040 dsa_master_ifindex);
2041 dsa_master_ifindex = 0;
2042 }
2043
2044 link->dsa_master_ifindex = (int) dsa_master_ifindex;
2045 }
2046
2047 return 1; /* needs reconfigure */
2048 }
2049
2050 static int link_update_permanent_hardware_address_from_ethtool(Link *link, sd_netlink_message *message) {
2051 int r;
2052
2053 assert(link);
2054 assert(link->manager);
2055 assert(message);
2056
2057 if (link->ethtool_permanent_hw_addr_read)
2058 return 0;
2059
2060 /* When udevd is running, read the permanent hardware address after the interface is
2061 * initialized by udevd. Otherwise, ethtool may not work correctly. See issue #22538.
2062 * When udevd is not running, read the value when the interface is detected. */
2063 if (udev_available() && !link->dev)
2064 return 0;
2065
2066 /* If the interface does not have a hardware address, then it will not have a permanent address either. */
2067 r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, NULL);
2068 if (r == -ENODATA)
2069 return 0;
2070 if (r < 0)
2071 return log_link_debug_errno(link, r, "Failed to read IFLA_ADDRESS attribute: %m");
2072
2073 link->ethtool_permanent_hw_addr_read = true;
2074
2075 r = ethtool_get_permanent_hw_addr(&link->manager->ethtool_fd, link->ifname, &link->permanent_hw_addr);
2076 if (r < 0)
2077 log_link_debug_errno(link, r, "Permanent hardware address not found, continuing without: %m");
2078
2079 return 0;
2080 }
2081
2082 static int link_update_permanent_hardware_address(Link *link, sd_netlink_message *message) {
2083 int r;
2084
2085 assert(link);
2086 assert(link->manager);
2087 assert(message);
2088
2089 if (link->permanent_hw_addr.length > 0)
2090 return 0;
2091
2092 r = netlink_message_read_hw_addr(message, IFLA_PERM_ADDRESS, &link->permanent_hw_addr);
2093 if (r < 0) {
2094 if (r != -ENODATA)
2095 return log_link_debug_errno(link, r, "Failed to read IFLA_PERM_ADDRESS attribute: %m");
2096
2097 /* Fallback to ethtool for older kernels. */
2098 r = link_update_permanent_hardware_address_from_ethtool(link, message);
2099 if (r < 0)
2100 return r;
2101 }
2102
2103 if (link->permanent_hw_addr.length > 0)
2104 log_link_debug(link, "Saved permanent hardware address: %s", HW_ADDR_TO_STR(&link->permanent_hw_addr));
2105
2106 return 1; /* needs reconfigure */
2107 }
2108
2109 static int link_update_hardware_address(Link *link, sd_netlink_message *message) {
2110 struct hw_addr_data addr;
2111 int r;
2112
2113 assert(link);
2114 assert(message);
2115
2116 r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr);
2117 if (r < 0 && r != -ENODATA)
2118 return log_link_debug_errno(link, r, "rtnl: failed to read broadcast address: %m");
2119
2120 r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &addr);
2121 if (r == -ENODATA)
2122 return 0;
2123 if (r < 0)
2124 return log_link_debug_errno(link, r, "rtnl: failed to read hardware address: %m");
2125
2126 if (hw_addr_equal(&link->hw_addr, &addr))
2127 return 0;
2128
2129 if (link->hw_addr.length == 0)
2130 log_link_debug(link, "Saved hardware address: %s", HW_ADDR_TO_STR(&addr));
2131 else {
2132 log_link_debug(link, "Hardware address is changed: %s %s %s",
2133 HW_ADDR_TO_STR(&link->hw_addr),
2134 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT),
2135 HW_ADDR_TO_STR(&addr));
2136
2137 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
2138 }
2139
2140 link->hw_addr = addr;
2141
2142 if (!hw_addr_is_null(&link->hw_addr)) {
2143 r = hashmap_ensure_put(&link->manager->links_by_hw_addr, &hw_addr_hash_ops, &link->hw_addr, link);
2144 if (r == -EEXIST && streq_ptr(link->kind, "bond"))
2145 /* bonding master and its slaves have the same hardware address. */
2146 r = hashmap_replace(link->manager->links_by_hw_addr, &link->hw_addr, link);
2147 if (r < 0)
2148 log_link_debug_errno(link, r, "Failed to manage link by its new hardware address, ignoring: %m");
2149 }
2150
2151 r = ipv4acd_update_mac(link);
2152 if (r < 0)
2153 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m");
2154
2155 r = ipv4ll_update_mac(link);
2156 if (r < 0)
2157 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
2158
2159 r = dhcp4_update_mac(link);
2160 if (r < 0)
2161 return log_link_debug_errno(link, r, "Could not update MAC address in DHCP client: %m");
2162
2163 r = dhcp6_update_mac(link);
2164 if (r < 0)
2165 return log_link_debug_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
2166
2167 r = radv_update_mac(link);
2168 if (r < 0)
2169 return log_link_debug_errno(link, r, "Could not update MAC address for Router Advertisement: %m");
2170
2171 if (link->ndisc && link->hw_addr.length == ETH_ALEN) {
2172 r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether);
2173 if (r < 0)
2174 return log_link_debug_errno(link, r, "Could not update MAC for NDisc: %m");
2175 }
2176
2177 if (link->lldp_rx) {
2178 r = sd_lldp_rx_set_filter_address(link->lldp_rx, &link->hw_addr.ether);
2179 if (r < 0)
2180 return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Rx: %m");
2181 }
2182
2183 if (link->lldp_tx) {
2184 r = sd_lldp_tx_set_hwaddr(link->lldp_tx, &link->hw_addr.ether);
2185 if (r < 0)
2186 return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Tx: %m");
2187 }
2188
2189 return 1; /* needs reconfigure */
2190 }
2191
2192 static int link_update_mtu(Link *link, sd_netlink_message *message) {
2193 uint32_t mtu, min_mtu = 0, max_mtu = UINT32_MAX;
2194 int r;
2195
2196 assert(link);
2197 assert(message);
2198
2199 r = sd_netlink_message_read_u32(message, IFLA_MTU, &mtu);
2200 if (r == -ENODATA)
2201 return 0;
2202 if (r < 0)
2203 return log_link_debug_errno(link, r, "rtnl: failed to read MTU in RTM_NEWLINK message: %m");
2204 if (mtu == 0)
2205 return 0;
2206
2207 r = sd_netlink_message_read_u32(message, IFLA_MIN_MTU, &min_mtu);
2208 if (r < 0 && r != -ENODATA)
2209 return log_link_debug_errno(link, r, "rtnl: failed to read minimum MTU in RTM_NEWLINK message: %m");
2210
2211 r = sd_netlink_message_read_u32(message, IFLA_MAX_MTU, &max_mtu);
2212 if (r < 0 && r != -ENODATA)
2213 return log_link_debug_errno(link, r, "rtnl: failed to read maximum MTU in RTM_NEWLINK message: %m");
2214
2215 if (max_mtu == 0)
2216 max_mtu = UINT32_MAX;
2217
2218 link->min_mtu = min_mtu;
2219 link->max_mtu = max_mtu;
2220
2221 if (link->original_mtu == 0) {
2222 link->original_mtu = mtu;
2223 log_link_debug(link, "Saved original MTU %" PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2224 link->original_mtu, link->min_mtu, link->max_mtu);
2225 }
2226
2227 if (link->mtu == mtu)
2228 return 0;
2229
2230 if (link->mtu != 0)
2231 log_link_debug(link, "MTU is changed: %"PRIu32" %s %"PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2232 link->mtu, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), mtu,
2233 link->min_mtu, link->max_mtu);
2234
2235 link->mtu = mtu;
2236
2237 if (link->dhcp_client) {
2238 r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
2239 if (r < 0)
2240 return log_link_debug_errno(link, r, "Could not update MTU in DHCP client: %m");
2241 }
2242
2243 if (link->radv) {
2244 r = sd_radv_set_mtu(link->radv, link->mtu);
2245 if (r < 0)
2246 return log_link_debug_errno(link, r, "Could not set MTU for Router Advertisement: %m");
2247 }
2248
2249 return 0;
2250 }
2251
2252 static int link_update_alternative_names(Link *link, sd_netlink_message *message) {
2253 _cleanup_strv_free_ char **altnames = NULL;
2254 int r;
2255
2256 assert(link);
2257 assert(message);
2258
2259 r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &altnames);
2260 if (r == -ENODATA)
2261 /* The message does not have IFLA_PROP_LIST container attribute. It does not mean the
2262 * interface has no alternative name. */
2263 return 0;
2264 if (r < 0)
2265 return log_link_debug_errno(link, r, "rtnl: failed to read alternative names: %m");
2266
2267 if (strv_equal(altnames, link->alternative_names))
2268 return 0;
2269
2270 STRV_FOREACH(n, link->alternative_names)
2271 hashmap_remove(link->manager->links_by_name, *n);
2272
2273 strv_free_and_replace(link->alternative_names, altnames);
2274
2275 STRV_FOREACH(n, link->alternative_names) {
2276 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, *n, link);
2277 if (r < 0)
2278 return log_link_debug_errno(link, r, "Failed to manage link by its new alternative names: %m");
2279 }
2280
2281 return 1; /* needs reconfigure */
2282 }
2283
2284 static int link_update_name(Link *link, sd_netlink_message *message) {
2285 char ifname_from_index[IF_NAMESIZE];
2286 const char *ifname;
2287 int r;
2288
2289 assert(link);
2290 assert(message);
2291
2292 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
2293 if (r == -ENODATA)
2294 /* Hmm?? But ok. */
2295 return 0;
2296 if (r < 0)
2297 return log_link_debug_errno(link, r, "Failed to read interface name in RTM_NEWLINK message: %m");
2298
2299 if (streq(ifname, link->ifname))
2300 return 0;
2301
2302 r = format_ifname(link->ifindex, ifname_from_index);
2303 if (r < 0)
2304 return log_link_debug_errno(link, r, "Could not get interface name for index %i.", link->ifindex);
2305
2306 if (!streq(ifname, ifname_from_index)) {
2307 log_link_debug(link, "New interface name '%s' received from the kernel does not correspond "
2308 "with the name currently configured on the actual interface '%s'. Ignoring.",
2309 ifname, ifname_from_index);
2310 return 0;
2311 }
2312
2313 log_link_info(link, "Interface name change detected, renamed to %s.", ifname);
2314
2315 hashmap_remove(link->manager->links_by_name, link->ifname);
2316
2317 r = free_and_strdup(&link->ifname, ifname);
2318 if (r < 0)
2319 return log_oom_debug();
2320
2321 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, link->ifname, link);
2322 if (r < 0)
2323 return log_link_debug_errno(link, r, "Failed to manage link by its new name: %m");
2324
2325 if (link->dhcp_client) {
2326 r = sd_dhcp_client_set_ifname(link->dhcp_client, link->ifname);
2327 if (r < 0)
2328 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP client: %m");
2329 }
2330
2331 if (link->dhcp6_client) {
2332 r = sd_dhcp6_client_set_ifname(link->dhcp6_client, link->ifname);
2333 if (r < 0)
2334 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP6 client: %m");
2335 }
2336
2337 if (link->ndisc) {
2338 r = sd_ndisc_set_ifname(link->ndisc, link->ifname);
2339 if (r < 0)
2340 return log_link_debug_errno(link, r, "Failed to update interface name in NDisc: %m");
2341 }
2342
2343 if (link->dhcp_server) {
2344 r = sd_dhcp_server_set_ifname(link->dhcp_server, link->ifname);
2345 if (r < 0)
2346 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP server: %m");
2347 }
2348
2349 if (link->radv) {
2350 r = sd_radv_set_ifname(link->radv, link->ifname);
2351 if (r < 0)
2352 return log_link_debug_errno(link, r, "Failed to update interface name in Router Advertisement: %m");
2353 }
2354
2355 if (link->lldp_rx) {
2356 r = sd_lldp_rx_set_ifname(link->lldp_rx, link->ifname);
2357 if (r < 0)
2358 return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Rx: %m");
2359 }
2360
2361 if (link->lldp_tx) {
2362 r = sd_lldp_tx_set_ifname(link->lldp_tx, link->ifname);
2363 if (r < 0)
2364 return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Tx: %m");
2365 }
2366
2367 if (link->ipv4ll) {
2368 r = sd_ipv4ll_set_ifname(link->ipv4ll, link->ifname);
2369 if (r < 0)
2370 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4LL client: %m");
2371 }
2372
2373 r = ipv4acd_set_ifname(link);
2374 if (r < 0)
2375 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4ACD client: %m");
2376
2377 return 1; /* needs reconfigure */
2378 }
2379
2380 static int link_update(Link *link, sd_netlink_message *message) {
2381 bool needs_reconfigure = false;
2382 int r;
2383
2384 assert(link);
2385 assert(message);
2386
2387 r = link_update_name(link, message);
2388 if (r < 0)
2389 return r;
2390 needs_reconfigure = needs_reconfigure || r > 0;
2391
2392 r = link_update_alternative_names(link, message);
2393 if (r < 0)
2394 return r;
2395 needs_reconfigure = needs_reconfigure || r > 0;
2396
2397 r = link_update_mtu(link, message);
2398 if (r < 0)
2399 return r;
2400
2401 r = link_update_driver(link, message);
2402 if (r < 0)
2403 return r;
2404 needs_reconfigure = needs_reconfigure || r > 0;
2405
2406 r = link_update_permanent_hardware_address(link, message);
2407 if (r < 0)
2408 return r;
2409 needs_reconfigure = needs_reconfigure || r > 0;
2410
2411 r = link_update_hardware_address(link, message);
2412 if (r < 0)
2413 return r;
2414 needs_reconfigure = needs_reconfigure || r > 0;
2415
2416 r = link_update_master(link, message);
2417 if (r < 0)
2418 return r;
2419
2420 r = link_update_ipv6ll_addrgen_mode(link, message);
2421 if (r < 0)
2422 return r;
2423
2424 r = link_update_flags(link, message);
2425 if (r < 0)
2426 return r;
2427
2428 return needs_reconfigure;
2429 }
2430
2431 static Link *link_drop_or_unref(Link *link) {
2432 if (!link)
2433 return NULL;
2434 if (!link->manager)
2435 return link_unref(link);
2436 return link_drop(link);
2437 }
2438
2439 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_drop_or_unref);
2440
2441 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
2442 _cleanup_free_ char *ifname = NULL, *kind = NULL, *state_file = NULL, *lease_file = NULL, *lldp_file = NULL;
2443 _cleanup_(link_drop_or_unrefp) Link *link = NULL;
2444 unsigned short iftype;
2445 int r, ifindex;
2446
2447 assert(manager);
2448 assert(message);
2449 assert(ret);
2450
2451 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2452 if (r < 0)
2453 return log_debug_errno(r, "rtnl: failed to read ifindex from link message: %m");
2454 else if (ifindex <= 0)
2455 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "rtnl: received link message without valid ifindex.");
2456
2457 r = sd_rtnl_message_link_get_type(message, &iftype);
2458 if (r < 0)
2459 return log_debug_errno(r, "rtnl: failed to read interface type from link message: %m");
2460
2461 r = sd_netlink_message_read_string_strdup(message, IFLA_IFNAME, &ifname);
2462 if (r < 0)
2463 return log_debug_errno(r, "rtnl: failed to read interface name from link message: %m");
2464
2465 /* check for link kind */
2466 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
2467 if (r >= 0) {
2468 r = sd_netlink_message_read_string_strdup(message, IFLA_INFO_KIND, &kind);
2469 if (r < 0 && r != -ENODATA)
2470 return log_debug_errno(r, "rtnl: failed to read interface kind from link message: %m");
2471 r = sd_netlink_message_exit_container(message);
2472 if (r < 0)
2473 return log_debug_errno(r, "rtnl: failed to exit IFLA_LINKINFO container: %m");
2474 }
2475
2476 if (!manager->test_mode) {
2477 /* Do not update state files when running in test mode. */
2478 if (asprintf(&state_file, "/run/systemd/netif/links/%d", ifindex) < 0)
2479 return log_oom_debug();
2480
2481 if (asprintf(&lease_file, "/run/systemd/netif/leases/%d", ifindex) < 0)
2482 return log_oom_debug();
2483
2484 if (asprintf(&lldp_file, "/run/systemd/netif/lldp/%d", ifindex) < 0)
2485 return log_oom_debug();
2486 }
2487
2488 link = new(Link, 1);
2489 if (!link)
2490 return -ENOMEM;
2491
2492 *link = (Link) {
2493 .n_ref = 1,
2494 .state = LINK_STATE_PENDING,
2495 .online_state = _LINK_ONLINE_STATE_INVALID,
2496 .ifindex = ifindex,
2497 .iftype = iftype,
2498 .ifname = TAKE_PTR(ifname),
2499 .kind = TAKE_PTR(kind),
2500
2501 .ipv6ll_address_gen_mode = _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_INVALID,
2502
2503 .state_file = TAKE_PTR(state_file),
2504 .lease_file = TAKE_PTR(lease_file),
2505 .lldp_file = TAKE_PTR(lldp_file),
2506
2507 .n_dns = UINT_MAX,
2508 .dns_default_route = -1,
2509 .llmnr = _RESOLVE_SUPPORT_INVALID,
2510 .mdns = _RESOLVE_SUPPORT_INVALID,
2511 .dnssec_mode = _DNSSEC_MODE_INVALID,
2512 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
2513 };
2514
2515 r = hashmap_ensure_put(&manager->links_by_index, NULL, INT_TO_PTR(link->ifindex), link);
2516 if (r < 0)
2517 return log_link_debug_errno(link, r, "Failed to store link into manager: %m");
2518
2519 link->manager = manager;
2520
2521 r = hashmap_ensure_put(&manager->links_by_name, &string_hash_ops, link->ifname, link);
2522 if (r < 0)
2523 return log_link_debug_errno(link, r, "Failed to manage link by its interface name: %m");
2524
2525 log_link_debug(link, "Saved new link: ifindex=%i, iftype=%s(%u), kind=%s",
2526 link->ifindex, strna(arphrd_to_name(link->iftype)), link->iftype, strna(link->kind));
2527
2528 /* If contained in this set, the link is wireless and the corresponding NL80211_CMD_NEW_INTERFACE
2529 * message arrived too early. Request the wireless link information again.
2530 */
2531 if (set_remove(manager->new_wlan_ifindices, INT_TO_PTR(link->ifindex))) {
2532 r = link_get_wlan_interface(link);
2533 if (r < 0)
2534 log_link_warning_errno(link, r, "Failed to get wireless interface, ignoring: %m");
2535 }
2536
2537 *ret = TAKE_PTR(link);
2538 return 0;
2539 }
2540
2541 int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, Manager *manager) {
2542 Link *link = NULL;
2543 NetDev *netdev = NULL;
2544 uint16_t type;
2545 const char *name;
2546 int r, ifindex;
2547
2548 assert(rtnl);
2549 assert(message);
2550 assert(manager);
2551
2552 if (sd_netlink_message_is_error(message)) {
2553 r = sd_netlink_message_get_errno(message);
2554 if (r < 0)
2555 log_message_warning_errno(message, r, "rtnl: Could not receive link message, ignoring");
2556
2557 return 0;
2558 }
2559
2560 r = sd_netlink_message_get_type(message, &type);
2561 if (r < 0) {
2562 log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
2563 return 0;
2564 } else if (!IN_SET(type, RTM_NEWLINK, RTM_DELLINK)) {
2565 log_warning("rtnl: Received unexpected message type %u when processing link, ignoring.", type);
2566 return 0;
2567 }
2568
2569 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2570 if (r < 0) {
2571 log_warning_errno(r, "rtnl: Could not get ifindex from link message, ignoring: %m");
2572 return 0;
2573 } else if (ifindex <= 0) {
2574 log_warning("rtnl: received link message with invalid ifindex %d, ignoring.", ifindex);
2575 return 0;
2576 }
2577
2578 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
2579 if (r < 0) {
2580 log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
2581 return 0;
2582 }
2583
2584 (void) link_get_by_index(manager, ifindex, &link);
2585 (void) netdev_get(manager, name, &netdev);
2586
2587 switch (type) {
2588 case RTM_NEWLINK:
2589 if (netdev) {
2590 /* netdev exists, so make sure the ifindex matches */
2591 r = netdev_set_ifindex(netdev, message);
2592 if (r < 0) {
2593 log_netdev_warning_errno(netdev, r, "Could not process new link message for netdev, ignoring: %m");
2594 return 0;
2595 }
2596 }
2597
2598 if (!link) {
2599 /* link is new, so add it */
2600 r = link_new(manager, message, &link);
2601 if (r < 0) {
2602 log_warning_errno(r, "Could not process new link message: %m");
2603 return 0;
2604 }
2605
2606 r = link_update(link, message);
2607 if (r < 0) {
2608 log_link_warning_errno(link, r, "Could not process link message: %m");
2609 link_enter_failed(link);
2610 return 0;
2611 }
2612
2613 r = link_check_initialized(link);
2614 if (r < 0) {
2615 log_link_warning_errno(link, r, "Failed to check link is initialized: %m");
2616 link_enter_failed(link);
2617 return 0;
2618 }
2619 } else {
2620 r = link_update(link, message);
2621 if (r < 0) {
2622 log_link_warning_errno(link, r, "Could not process link message: %m");
2623 link_enter_failed(link);
2624 return 0;
2625 }
2626 if (r > 0) {
2627 r = link_reconfigure_impl(link, /* force = */ false);
2628 if (r < 0) {
2629 log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
2630 link_enter_failed(link);
2631 return 0;
2632 }
2633 }
2634 }
2635 break;
2636
2637 case RTM_DELLINK:
2638 link_drop(link);
2639 netdev_drop(netdev);
2640 break;
2641
2642 default:
2643 assert_not_reached();
2644 }
2645
2646 return 1;
2647 }
2648
2649 int link_getlink_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, const char *error_msg) {
2650 uint16_t message_type;
2651 int r;
2652
2653 assert(m);
2654 assert(link);
2655 assert(error_msg);
2656
2657 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2658 return 0;
2659
2660 r = sd_netlink_message_get_errno(m);
2661 if (r < 0) {
2662 log_link_message_warning_errno(link, m, r, error_msg);
2663 link_enter_failed(link);
2664 return 0;
2665 }
2666
2667 r = sd_netlink_message_get_type(m, &message_type);
2668 if (r < 0) {
2669 log_link_debug_errno(link, r, "rtnl: failed to read link message type, ignoring: %m");
2670 return 0;
2671 }
2672 if (message_type != RTM_NEWLINK) {
2673 log_link_debug(link, "rtnl: received invalid link message type, ignoring.");
2674 return 0;
2675 }
2676
2677 r = link_update(link, m);
2678 if (r < 0) {
2679 link_enter_failed(link);
2680 return 0;
2681 }
2682
2683 return 1;
2684 }
2685
2686 int link_call_getlink(Link *link, link_netlink_message_handler_t callback) {
2687 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2688 int r;
2689
2690 assert(link);
2691 assert(link->manager);
2692 assert(link->manager->rtnl);
2693 assert(callback);
2694
2695 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
2696 if (r < 0)
2697 return r;
2698
2699 r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
2700 link_netlink_destroy_callback, link);
2701 if (r < 0)
2702 return r;
2703
2704 link_ref(link);
2705 return 0;
2706 }
2707
2708 static const char* const link_state_table[_LINK_STATE_MAX] = {
2709 [LINK_STATE_PENDING] = "pending",
2710 [LINK_STATE_INITIALIZED] = "initialized",
2711 [LINK_STATE_CONFIGURING] = "configuring",
2712 [LINK_STATE_CONFIGURED] = "configured",
2713 [LINK_STATE_UNMANAGED] = "unmanaged",
2714 [LINK_STATE_FAILED] = "failed",
2715 [LINK_STATE_LINGER] = "linger",
2716 };
2717
2718 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
2719
2720 int link_flags_to_string_alloc(uint32_t flags, char **ret) {
2721 _cleanup_free_ char *str = NULL;
2722 static const char* map[] = {
2723 [LOG2U(IFF_UP)] = "up", /* interface is up. */
2724 [LOG2U(IFF_BROADCAST)] = "broadcast", /* broadcast address valid. */
2725 [LOG2U(IFF_DEBUG)] = "debug", /* turn on debugging. */
2726 [LOG2U(IFF_LOOPBACK)] = "loopback", /* interface is a loopback net. */
2727 [LOG2U(IFF_POINTOPOINT)] = "point-to-point", /* interface has p-p link. */
2728 [LOG2U(IFF_NOTRAILERS)] = "no-trailers", /* avoid use of trailers. */
2729 [LOG2U(IFF_RUNNING)] = "running", /* interface RFC2863 OPER_UP. */
2730 [LOG2U(IFF_NOARP)] = "no-arp", /* no ARP protocol. */
2731 [LOG2U(IFF_PROMISC)] = "promiscuous", /* receive all packets. */
2732 [LOG2U(IFF_ALLMULTI)] = "all-multicast", /* receive all multicast packets. */
2733 [LOG2U(IFF_MASTER)] = "master", /* master of a load balancer. */
2734 [LOG2U(IFF_SLAVE)] = "slave", /* slave of a load balancer. */
2735 [LOG2U(IFF_MULTICAST)] = "multicast", /* supports multicast. */
2736 [LOG2U(IFF_PORTSEL)] = "portsel", /* can set media type. */
2737 [LOG2U(IFF_AUTOMEDIA)] = "auto-media", /* auto media select active. */
2738 [LOG2U(IFF_DYNAMIC)] = "dynamic", /* dialup device with changing addresses. */
2739 [LOG2U(IFF_LOWER_UP)] = "lower-up", /* driver signals L1 up. */
2740 [LOG2U(IFF_DORMANT)] = "dormant", /* driver signals dormant. */
2741 [LOG2U(IFF_ECHO)] = "echo", /* echo sent packets. */
2742 };
2743
2744 assert(ret);
2745
2746 for (size_t i = 0; i < ELEMENTSOF(map); i++)
2747 if (FLAGS_SET(flags, 1 << i) && map[i])
2748 if (!strextend_with_separator(&str, ",", map[i]))
2749 return -ENOMEM;
2750
2751 *ret = TAKE_PTR(str);
2752 return 0;
2753 }
2754
2755 static const char * const kernel_operstate_table[] = {
2756 [IF_OPER_UNKNOWN] = "unknown",
2757 [IF_OPER_NOTPRESENT] = "not-present",
2758 [IF_OPER_DOWN] = "down",
2759 [IF_OPER_LOWERLAYERDOWN] = "lower-layer-down",
2760 [IF_OPER_TESTING] = "testing",
2761 [IF_OPER_DORMANT] = "dormant",
2762 [IF_OPER_UP] = "up",
2763 };
2764
2765 DEFINE_STRING_TABLE_LOOKUP_TO_STRING(kernel_operstate, int);
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