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Merge pull request #29692 from H5117/fix_pkcs11_uri
[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-lease-internal.h"
21 #include "env-file.h"
22 #include "ethtool-util.h"
23 #include "event-util.h"
24 #include "fd-util.h"
25 #include "fileio.h"
26 #include "format-util.h"
27 #include "fs-util.h"
28 #include "glyph-util.h"
29 #include "logarithm.h"
30 #include "missing_network.h"
31 #include "netlink-util.h"
32 #include "network-internal.h"
33 #include "networkd-address-label.h"
34 #include "networkd-address.h"
35 #include "networkd-bridge-fdb.h"
36 #include "networkd-bridge-mdb.h"
37 #include "networkd-bridge-vlan.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->neighbors = set_free(link->neighbors);
212 link->addresses = set_free(link->addresses);
213 link->qdiscs = set_free(link->qdiscs);
214 link->tclasses = set_free(link->tclasses);
215
216 link->dhcp_pd_prefixes = set_free(link->dhcp_pd_prefixes);
217
218 link_free_engines(link);
219
220 set_free(link->sr_iov_virt_port_ifindices);
221 free(link->ifname);
222 strv_free(link->alternative_names);
223 free(link->kind);
224 free(link->ssid);
225 free(link->previous_ssid);
226 free(link->driver);
227
228 unlink_and_free(link->lease_file);
229 unlink_and_free(link->lldp_file);
230 unlink_and_free(link->state_file);
231
232 sd_device_unref(link->dev);
233 netdev_unref(link->netdev);
234
235 hashmap_free(link->bound_to_links);
236 hashmap_free(link->bound_by_links);
237
238 set_free_with_destructor(link->slaves, link_unref);
239
240 network_unref(link->network);
241
242 sd_event_source_disable_unref(link->carrier_lost_timer);
243
244 return mfree(link);
245 }
246
247 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
248
249 int link_get_by_index(Manager *m, int ifindex, Link **ret) {
250 Link *link;
251
252 assert(m);
253
254 if (ifindex <= 0)
255 return -EINVAL;
256
257 link = hashmap_get(m->links_by_index, INT_TO_PTR(ifindex));
258 if (!link)
259 return -ENODEV;
260
261 if (ret)
262 *ret = link;
263 return 0;
264 }
265
266 int link_get_by_name(Manager *m, const char *ifname, Link **ret) {
267 Link *link;
268
269 assert(m);
270 assert(ifname);
271
272 link = hashmap_get(m->links_by_name, ifname);
273 if (!link)
274 return -ENODEV;
275
276 if (ret)
277 *ret = link;
278 return 0;
279 }
280
281 int link_get_by_hw_addr(Manager *m, const struct hw_addr_data *hw_addr, Link **ret) {
282 Link *link;
283
284 assert(m);
285 assert(hw_addr);
286
287 link = hashmap_get(m->links_by_hw_addr, hw_addr);
288 if (!link)
289 return -ENODEV;
290
291 if (ret)
292 *ret = link;
293 return 0;
294 }
295
296 int link_get_master(Link *link, Link **ret) {
297 assert(link);
298 assert(link->manager);
299 assert(ret);
300
301 if (link->master_ifindex <= 0 || link->master_ifindex == link->ifindex)
302 return -ENODEV;
303
304 return link_get_by_index(link->manager, link->master_ifindex, ret);
305 }
306
307 void link_set_state(Link *link, LinkState state) {
308 assert(link);
309
310 if (link->state == state)
311 return;
312
313 log_link_debug(link, "State changed: %s -> %s",
314 link_state_to_string(link->state),
315 link_state_to_string(state));
316
317 link->state = state;
318
319 link_send_changed(link, "AdministrativeState", NULL);
320 link_dirty(link);
321 }
322
323 int link_stop_engines(Link *link, bool may_keep_dhcp) {
324 int r, ret = 0;
325
326 assert(link);
327 assert(link->manager);
328 assert(link->manager->event);
329
330 bool keep_dhcp = may_keep_dhcp &&
331 link->network &&
332 !link->network->dhcp_send_decline && /* IPv4 ACD for the DHCPv4 address is running. */
333 (link->manager->restarting ||
334 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
335
336 if (!keep_dhcp) {
337 r = sd_dhcp_client_stop(link->dhcp_client);
338 if (r < 0)
339 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv4 client: %m"));
340 }
341
342 r = sd_dhcp_server_stop(link->dhcp_server);
343 if (r < 0)
344 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv4 server: %m"));
345
346 r = sd_lldp_rx_stop(link->lldp_rx);
347 if (r < 0)
348 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop LLDP Rx: %m"));
349
350 r = sd_lldp_tx_stop(link->lldp_tx);
351 if (r < 0)
352 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop LLDP Tx: %m"));
353
354 r = sd_ipv4ll_stop(link->ipv4ll);
355 if (r < 0)
356 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv4 link-local: %m"));
357
358 r = ipv4acd_stop(link);
359 if (r < 0)
360 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv4 ACD client: %m"));
361
362 r = sd_dhcp6_client_stop(link->dhcp6_client);
363 if (r < 0)
364 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv6 client: %m"));
365
366 r = dhcp_pd_remove(link, /* only_marked = */ false);
367 if (r < 0)
368 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not remove DHCPv6 PD addresses and routes: %m"));
369
370 r = ndisc_stop(link);
371 if (r < 0)
372 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv6 Router Discovery: %m"));
373
374 ndisc_flush(link);
375
376 r = sd_radv_stop(link->radv);
377 if (r < 0)
378 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv6 Router Advertisement: %m"));
379
380 return ret;
381 }
382
383 void link_enter_failed(Link *link) {
384 assert(link);
385
386 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
387 return;
388
389 log_link_warning(link, "Failed");
390
391 link_set_state(link, LINK_STATE_FAILED);
392
393 (void) link_stop_engines(link, false);
394 }
395
396 void link_check_ready(Link *link) {
397 Address *a;
398
399 assert(link);
400
401 if (link->state == LINK_STATE_CONFIGURED)
402 return;
403
404 if (link->state != LINK_STATE_CONFIGURING)
405 return (void) log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state));
406
407 if (!link->network)
408 return (void) log_link_debug(link, "%s(): link is unmanaged.", __func__);
409
410 if (!link->tc_configured)
411 return (void) log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
412
413 if (link->set_link_messages > 0)
414 return (void) log_link_debug(link, "%s(): link layer is configuring.", __func__);
415
416 if (!link->activated)
417 return (void) log_link_debug(link, "%s(): link is not activated.", __func__);
418
419 if (link->iftype == ARPHRD_CAN) {
420 /* let's shortcut things for CAN which doesn't need most of checks below. */
421 link_set_state(link, LINK_STATE_CONFIGURED);
422 return;
423 }
424
425 if (!link->stacked_netdevs_created)
426 return (void) log_link_debug(link, "%s(): stacked netdevs are not created.", __func__);
427
428 if (!link->static_addresses_configured)
429 return (void) log_link_debug(link, "%s(): static addresses are not configured.", __func__);
430
431 if (!link->static_address_labels_configured)
432 return (void) log_link_debug(link, "%s(): static address labels are not configured.", __func__);
433
434 if (!link->static_bridge_fdb_configured)
435 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
436
437 if (!link->static_bridge_mdb_configured)
438 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
439
440 if (!link->static_ipv6_proxy_ndp_configured)
441 return (void) log_link_debug(link, "%s(): static IPv6 proxy NDP addresses are not configured.", __func__);
442
443 if (!link->static_neighbors_configured)
444 return (void) log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
445
446 if (!link->static_nexthops_configured)
447 return (void) log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
448
449 if (!link->static_routes_configured)
450 return (void) log_link_debug(link, "%s(): static routes are not configured.", __func__);
451
452 if (!link->static_routing_policy_rules_configured)
453 return (void) log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
454
455 if (!link->sr_iov_configured)
456 return (void) log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
457
458 /* IPv6LL is assigned after the link gains its carrier. */
459 if (!link->network->configure_without_carrier &&
460 link_ipv6ll_enabled(link) &&
461 !in6_addr_is_set(&link->ipv6ll_address))
462 return (void) log_link_debug(link, "%s(): IPv6LL is not configured yet.", __func__);
463
464 /* All static addresses must be ready. */
465 bool has_static_address = false;
466 SET_FOREACH(a, link->addresses) {
467 if (a->source != NETWORK_CONFIG_SOURCE_STATIC)
468 continue;
469 if (!address_is_ready(a))
470 return (void) log_link_debug(link, "%s(): static address %s is not ready.", __func__,
471 IN_ADDR_PREFIX_TO_STRING(a->family, &a->in_addr, a->prefixlen));
472 has_static_address = true;
473 }
474
475 /* If at least one static address is requested, do not request that dynamic addressing protocols are finished. */
476 if (has_static_address)
477 goto ready;
478
479 /* If no dynamic addressing protocol enabled, assume the interface is ready.
480 * Note, ignore NDisc when ConfigureWithoutCarrier= is enabled, as IPv6AcceptRA= is enabled by default. */
481 if (!link_ipv4ll_enabled(link) && !link_dhcp4_enabled(link) &&
482 !link_dhcp6_enabled(link) && !link_dhcp_pd_is_enabled(link) &&
483 (link->network->configure_without_carrier || !link_ipv6_accept_ra_enabled(link)))
484 goto ready;
485
486 bool ipv4ll_ready =
487 link_ipv4ll_enabled(link) && link->ipv4ll_address_configured &&
488 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_IPV4LL);
489 bool dhcp4_ready =
490 link_dhcp4_enabled(link) && link->dhcp4_configured &&
491 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP4);
492 bool dhcp6_ready =
493 link_dhcp6_enabled(link) && link->dhcp6_configured &&
494 (!link->network->dhcp6_use_address ||
495 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP6));
496 bool dhcp_pd_ready =
497 link_dhcp_pd_is_enabled(link) && link->dhcp_pd_configured &&
498 (!link->network->dhcp_pd_assign ||
499 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP_PD));
500 bool ndisc_ready =
501 link_ipv6_accept_ra_enabled(link) && link->ndisc_configured &&
502 (!link->network->ipv6_accept_ra_use_autonomous_prefix ||
503 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_NDISC));
504
505 /* If the uplink for PD is self, then request the corresponding DHCP protocol is also ready. */
506 if (dhcp_pd_is_uplink(link, link, /* accept_auto = */ false)) {
507 if (link_dhcp4_enabled(link) && link->network->dhcp_use_6rd &&
508 sd_dhcp_lease_has_6rd(link->dhcp_lease)) {
509 if (!dhcp4_ready)
510 return (void) log_link_debug(link, "%s(): DHCPv4 6rd prefix is assigned, but DHCPv4 protocol is not finished yet.", __func__);
511 if (!dhcp_pd_ready)
512 return (void) log_link_debug(link, "%s(): DHCPv4 is finished, but prefix acquired by DHCPv4-6rd is not assigned yet.", __func__);
513 }
514
515 if (link_dhcp6_enabled(link) && link->network->dhcp6_use_pd_prefix &&
516 sd_dhcp6_lease_has_pd_prefix(link->dhcp6_lease)) {
517 if (!dhcp6_ready)
518 return (void) log_link_debug(link, "%s(): DHCPv6 IA_PD prefix is assigned, but DHCPv6 protocol is not finished yet.", __func__);
519 if (!dhcp_pd_ready)
520 return (void) log_link_debug(link, "%s(): DHCPv6 is finished, but prefix acquired by DHCPv6 IA_PD is not assigned yet.", __func__);
521 }
522 }
523
524 /* At least one dynamic addressing protocol is finished. */
525 if (!ipv4ll_ready && !dhcp4_ready && !dhcp6_ready && !dhcp_pd_ready && !ndisc_ready)
526 return (void) log_link_debug(link, "%s(): dynamic addressing protocols are enabled but none of them finished yet.", __func__);
527
528 log_link_debug(link, "%s(): IPv4LL:%s DHCPv4:%s DHCPv6:%s DHCP-PD:%s NDisc:%s",
529 __func__,
530 yes_no(ipv4ll_ready),
531 yes_no(dhcp4_ready),
532 yes_no(dhcp6_ready),
533 yes_no(dhcp_pd_ready),
534 yes_no(ndisc_ready));
535
536 ready:
537 link_set_state(link, LINK_STATE_CONFIGURED);
538 }
539
540 static int link_request_static_configs(Link *link) {
541 int r;
542
543 assert(link);
544 assert(link->network);
545 assert(link->state != _LINK_STATE_INVALID);
546
547 r = link_request_static_addresses(link);
548 if (r < 0)
549 return r;
550
551 r = link_request_static_address_labels(link);
552 if (r < 0)
553 return r;
554
555 r = link_request_static_bridge_fdb(link);
556 if (r < 0)
557 return r;
558
559 r = link_request_static_bridge_mdb(link);
560 if (r < 0)
561 return r;
562
563 r = link_request_static_ipv6_proxy_ndp_addresses(link);
564 if (r < 0)
565 return r;
566
567 r = link_request_static_neighbors(link);
568 if (r < 0)
569 return r;
570
571 r = link_request_static_nexthops(link, false);
572 if (r < 0)
573 return r;
574
575 r = link_request_static_routes(link, false);
576 if (r < 0)
577 return r;
578
579 r = link_request_static_routing_policy_rules(link);
580 if (r < 0)
581 return r;
582
583 return 0;
584 }
585
586 static int link_request_stacked_netdevs(Link *link) {
587 NetDev *netdev;
588 int r;
589
590 assert(link);
591
592 link->stacked_netdevs_created = false;
593
594 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) {
595 r = link_request_stacked_netdev(link, netdev);
596 if (r < 0)
597 return r;
598 }
599
600 if (link->create_stacked_netdev_messages == 0) {
601 link->stacked_netdevs_created = true;
602 link_check_ready(link);
603 }
604
605 return 0;
606 }
607
608 static int link_acquire_dynamic_ipv6_conf(Link *link) {
609 int r;
610
611 assert(link);
612
613 r = radv_start(link);
614 if (r < 0)
615 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Advertisement engine: %m");
616
617 r = ndisc_start(link);
618 if (r < 0)
619 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Discovery: %m");
620
621 r = dhcp6_start(link);
622 if (r < 0)
623 return log_link_warning_errno(link, r, "Failed to start DHCPv6 client: %m");
624
625 return 0;
626 }
627
628 static int link_acquire_dynamic_ipv4_conf(Link *link) {
629 int r;
630
631 assert(link);
632 assert(link->manager);
633 assert(link->manager->event);
634
635 if (link->dhcp_client) {
636 r = dhcp4_start(link);
637 if (r < 0)
638 return log_link_warning_errno(link, r, "Failed to start DHCPv4 client: %m");
639
640 log_link_debug(link, "Acquiring DHCPv4 lease.");
641
642 } else if (link->ipv4ll) {
643 if (in4_addr_is_set(&link->network->ipv4ll_start_address)) {
644 r = sd_ipv4ll_set_address(link->ipv4ll, &link->network->ipv4ll_start_address);
645 if (r < 0)
646 return log_link_warning_errno(link, r, "Could not set IPv4 link-local start address: %m");
647 }
648
649 r = sd_ipv4ll_start(link->ipv4ll);
650 if (r < 0)
651 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
652
653 log_link_debug(link, "Acquiring IPv4 link-local address.");
654 }
655
656 if (link->dhcp_server) {
657 r = sd_dhcp_server_start(link->dhcp_server);
658 if (r < 0)
659 return log_link_warning_errno(link, r, "Could not start DHCP server: %m");
660 }
661
662 r = ipv4acd_start(link);
663 if (r < 0)
664 return log_link_warning_errno(link, r, "Could not start IPv4 ACD client: %m");
665
666 return 0;
667 }
668
669 static int link_acquire_dynamic_conf(Link *link) {
670 int r;
671
672 assert(link);
673 assert(link->network);
674
675 r = link_acquire_dynamic_ipv4_conf(link);
676 if (r < 0)
677 return r;
678
679 if (in6_addr_is_set(&link->ipv6ll_address)) {
680 r = link_acquire_dynamic_ipv6_conf(link);
681 if (r < 0)
682 return r;
683 }
684
685 if (!link_radv_enabled(link) || !link->network->dhcp_pd_announce) {
686 /* DHCPv6PD downstream does not require IPv6LL address. But may require RADV to be
687 * configured, and RADV may not be configured yet here. Only acquire subnet prefix when
688 * RADV is disabled, or the announcement of the prefix is disabled. Otherwise, the
689 * below will be called in radv_start(). */
690 r = dhcp_request_prefix_delegation(link);
691 if (r < 0)
692 return log_link_warning_errno(link, r, "Failed to request DHCP delegated subnet prefix: %m");
693 }
694
695 if (link->lldp_tx) {
696 r = sd_lldp_tx_start(link->lldp_tx);
697 if (r < 0)
698 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
699 }
700
701 if (link->lldp_rx) {
702 r = sd_lldp_rx_start(link->lldp_rx);
703 if (r < 0)
704 return log_link_warning_errno(link, r, "Failed to start LLDP client: %m");
705 }
706
707 return 0;
708 }
709
710 int link_ipv6ll_gained(Link *link) {
711 int r;
712
713 assert(link);
714
715 log_link_info(link, "Gained IPv6LL");
716
717 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
718 return 0;
719
720 r = link_acquire_dynamic_ipv6_conf(link);
721 if (r < 0)
722 return r;
723
724 link_check_ready(link);
725 return 0;
726 }
727
728 int link_handle_bound_to_list(Link *link) {
729 bool required_up = false;
730 bool link_is_up = false;
731 Link *l;
732
733 assert(link);
734
735 /* If at least one interface in bound_to_links has carrier, then make this interface up.
736 * If all interfaces in bound_to_links do not, then make this interface down. */
737
738 if (hashmap_isempty(link->bound_to_links))
739 return 0;
740
741 if (link->flags & IFF_UP)
742 link_is_up = true;
743
744 HASHMAP_FOREACH(l, link->bound_to_links)
745 if (link_has_carrier(l)) {
746 required_up = true;
747 break;
748 }
749
750 if (!required_up && link_is_up)
751 return link_request_to_bring_up_or_down(link, /* up = */ false);
752 if (required_up && !link_is_up)
753 return link_request_to_bring_up_or_down(link, /* up = */ true);
754
755 return 0;
756 }
757
758 static int link_handle_bound_by_list(Link *link) {
759 Link *l;
760 int r;
761
762 assert(link);
763
764 /* Update up or down state of interfaces which depend on this interface's carrier state. */
765
766 if (hashmap_isempty(link->bound_by_links))
767 return 0;
768
769 HASHMAP_FOREACH(l, link->bound_by_links) {
770 r = link_handle_bound_to_list(l);
771 if (r < 0)
772 return r;
773 }
774
775 return 0;
776 }
777
778 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
779 int r;
780
781 assert(link);
782 assert(carrier);
783
784 if (link == carrier)
785 return 0;
786
787 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
788 return 0;
789
790 r = hashmap_ensure_put(h, NULL, INT_TO_PTR(carrier->ifindex), carrier);
791 if (r < 0)
792 return r;
793
794 link_dirty(link);
795
796 return 0;
797 }
798
799 static int link_new_bound_by_list(Link *link) {
800 Manager *m;
801 Link *carrier;
802 int r;
803
804 assert(link);
805 assert(link->manager);
806
807 m = link->manager;
808
809 HASHMAP_FOREACH(carrier, m->links_by_index) {
810 if (!carrier->network)
811 continue;
812
813 if (strv_isempty(carrier->network->bind_carrier))
814 continue;
815
816 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
817 r = link_put_carrier(link, carrier, &link->bound_by_links);
818 if (r < 0)
819 return r;
820 }
821 }
822
823 HASHMAP_FOREACH(carrier, link->bound_by_links) {
824 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
825 if (r < 0)
826 return r;
827 }
828
829 return 0;
830 }
831
832 static int link_new_bound_to_list(Link *link) {
833 Manager *m;
834 Link *carrier;
835 int r;
836
837 assert(link);
838 assert(link->manager);
839
840 if (!link->network)
841 return 0;
842
843 if (strv_isempty(link->network->bind_carrier))
844 return 0;
845
846 m = link->manager;
847
848 HASHMAP_FOREACH(carrier, m->links_by_index) {
849 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
850 r = link_put_carrier(link, carrier, &link->bound_to_links);
851 if (r < 0)
852 return r;
853 }
854 }
855
856 HASHMAP_FOREACH(carrier, link->bound_to_links) {
857 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
858 if (r < 0)
859 return r;
860 }
861
862 return 0;
863 }
864
865 static void link_free_bound_to_list(Link *link) {
866 bool updated = false;
867 Link *bound_to;
868
869 assert(link);
870
871 while ((bound_to = hashmap_steal_first(link->bound_to_links))) {
872 updated = true;
873
874 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
875 link_dirty(bound_to);
876 }
877
878 if (updated)
879 link_dirty(link);
880 }
881
882 static void link_free_bound_by_list(Link *link) {
883 bool updated = false;
884 Link *bound_by;
885
886 assert(link);
887
888 while ((bound_by = hashmap_steal_first(link->bound_by_links))) {
889 updated = true;
890
891 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
892 link_dirty(bound_by);
893 link_handle_bound_to_list(bound_by);
894 }
895 }
896
897 if (updated)
898 link_dirty(link);
899 }
900
901 static int link_append_to_master(Link *link) {
902 Link *master;
903 int r;
904
905 assert(link);
906
907 /* - The link may have no master.
908 * - RTM_NEWLINK message about master interface may not be received yet. */
909 if (link_get_master(link, &master) < 0)
910 return 0;
911
912 r = set_ensure_put(&master->slaves, NULL, link);
913 if (r <= 0)
914 return r;
915
916 link_ref(link);
917 return 0;
918 }
919
920 static void link_drop_from_master(Link *link) {
921 Link *master;
922
923 assert(link);
924
925 if (!link->manager)
926 return;
927
928 if (link_get_master(link, &master) < 0)
929 return;
930
931 link_unref(set_remove(master->slaves, link));
932 }
933
934 static void link_drop_requests(Link *link) {
935 Request *req;
936
937 assert(link);
938 assert(link->manager);
939
940 ORDERED_SET_FOREACH(req, link->manager->request_queue)
941 if (req->link == link)
942 request_detach(link->manager, req);
943 }
944
945 static Link *link_drop(Link *link) {
946 if (!link)
947 return NULL;
948
949 assert(link->manager);
950
951 link_set_state(link, LINK_STATE_LINGER);
952
953 /* Drop all references from other links and manager. Note that async netlink calls may have
954 * references to the link, and they will be dropped when we receive replies. */
955
956 link_drop_requests(link);
957
958 link_free_bound_to_list(link);
959 link_free_bound_by_list(link);
960
961 link_clear_sr_iov_ifindices(link);
962
963 link_drop_from_master(link);
964
965 if (link->state_file)
966 (void) unlink(link->state_file);
967
968 link_clean(link);
969
970 STRV_FOREACH(n, link->alternative_names)
971 hashmap_remove(link->manager->links_by_name, *n);
972 hashmap_remove(link->manager->links_by_name, link->ifname);
973
974 /* bonding master and its slaves have the same hardware address. */
975 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
976
977 /* The following must be called at last. */
978 assert_se(hashmap_remove(link->manager->links_by_index, INT_TO_PTR(link->ifindex)) == link);
979 return link_unref(link);
980 }
981
982 static int link_drop_foreign_config(Link *link) {
983 int r;
984
985 assert(link);
986 assert(link->manager);
987
988 /* Drop foreign config, but ignore unmanaged, loopback, or critical interfaces. We do not want
989 * to remove loopback address or addresses used for root NFS. */
990
991 if (IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
992 return 0;
993 if (FLAGS_SET(link->flags, IFF_LOOPBACK))
994 return 0;
995 if (link->network->keep_configuration == KEEP_CONFIGURATION_YES)
996 return 0;
997
998 r = link_drop_foreign_routes(link);
999
1000 RET_GATHER(r, link_drop_foreign_nexthops(link));
1001 RET_GATHER(r, link_drop_foreign_addresses(link));
1002 RET_GATHER(r, link_drop_foreign_neighbors(link));
1003 RET_GATHER(r, manager_drop_foreign_routing_policy_rules(link->manager));
1004
1005 return r;
1006 }
1007
1008 static int link_drop_managed_config(Link *link) {
1009 int r;
1010
1011 assert(link);
1012 assert(link->manager);
1013
1014 r = link_drop_managed_routes(link);
1015
1016 RET_GATHER(r, link_drop_managed_nexthops(link));
1017 RET_GATHER(r, link_drop_managed_addresses(link));
1018 RET_GATHER(r, link_drop_managed_neighbors(link));
1019 RET_GATHER(r, link_drop_managed_routing_policy_rules(link));
1020
1021 return r;
1022 }
1023
1024 static void link_foreignize_config(Link *link) {
1025 assert(link);
1026 assert(link->manager);
1027
1028 link_foreignize_routes(link);
1029 link_foreignize_nexthops(link);
1030 link_foreignize_addresses(link);
1031 link_foreignize_neighbors(link);
1032 link_foreignize_routing_policy_rules(link);
1033 }
1034
1035 static int link_configure(Link *link) {
1036 int r;
1037
1038 assert(link);
1039 assert(link->network);
1040 assert(link->state == LINK_STATE_INITIALIZED);
1041
1042 link_set_state(link, LINK_STATE_CONFIGURING);
1043
1044 r = link_new_bound_to_list(link);
1045 if (r < 0)
1046 return r;
1047
1048 r = link_request_traffic_control(link);
1049 if (r < 0)
1050 return r;
1051
1052 r = link_configure_mtu(link);
1053 if (r < 0)
1054 return r;
1055
1056 if (link->iftype == ARPHRD_CAN) {
1057 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1058 r = link_request_to_set_can(link);
1059 if (r < 0)
1060 return r;
1061
1062 return link_request_to_activate(link);
1063 }
1064
1065 r = link_request_sr_iov_vfs(link);
1066 if (r < 0)
1067 return r;
1068
1069 r = link_set_sysctl(link);
1070 if (r < 0)
1071 return r;
1072
1073 r = link_request_to_set_mac(link, /* allow_retry = */ true);
1074 if (r < 0)
1075 return r;
1076
1077 r = link_request_to_set_ipoib(link);
1078 if (r < 0)
1079 return r;
1080
1081 r = link_request_to_set_flags(link);
1082 if (r < 0)
1083 return r;
1084
1085 r = link_request_to_set_group(link);
1086 if (r < 0)
1087 return r;
1088
1089 r = link_request_to_set_addrgen_mode(link);
1090 if (r < 0)
1091 return r;
1092
1093 r = link_request_to_set_master(link);
1094 if (r < 0)
1095 return r;
1096
1097 r = link_request_stacked_netdevs(link);
1098 if (r < 0)
1099 return r;
1100
1101 r = link_request_to_set_bond(link);
1102 if (r < 0)
1103 return r;
1104
1105 r = link_request_to_set_bridge(link);
1106 if (r < 0)
1107 return r;
1108
1109 r = link_request_to_set_bridge_vlan(link);
1110 if (r < 0)
1111 return r;
1112
1113 r = link_request_to_activate(link);
1114 if (r < 0)
1115 return r;
1116
1117 r = ipv4ll_configure(link);
1118 if (r < 0)
1119 return r;
1120
1121 r = link_request_dhcp4_client(link);
1122 if (r < 0)
1123 return r;
1124
1125 r = link_request_dhcp6_client(link);
1126 if (r < 0)
1127 return r;
1128
1129 r = link_request_ndisc(link);
1130 if (r < 0)
1131 return r;
1132
1133 r = link_request_dhcp_server(link);
1134 if (r < 0)
1135 return r;
1136
1137 r = link_request_radv(link);
1138 if (r < 0)
1139 return r;
1140
1141 r = link_lldp_rx_configure(link);
1142 if (r < 0)
1143 return r;
1144
1145 r = link_lldp_tx_configure(link);
1146 if (r < 0)
1147 return r;
1148
1149 r = link_drop_foreign_config(link);
1150 if (r < 0)
1151 return r;
1152
1153 r = link_request_static_configs(link);
1154 if (r < 0)
1155 return r;
1156
1157 if (!link_has_carrier(link))
1158 return 0;
1159
1160 return link_acquire_dynamic_conf(link);
1161 }
1162
1163 static int link_get_network(Link *link, Network **ret) {
1164 Network *network;
1165 int r;
1166
1167 assert(link);
1168 assert(link->manager);
1169 assert(ret);
1170
1171 ORDERED_HASHMAP_FOREACH(network, link->manager->networks) {
1172 bool warn = false;
1173
1174 r = net_match_config(
1175 &network->match,
1176 link->dev,
1177 &link->hw_addr,
1178 &link->permanent_hw_addr,
1179 link->driver,
1180 link->iftype,
1181 link->kind,
1182 link->ifname,
1183 link->alternative_names,
1184 link->wlan_iftype,
1185 link->ssid,
1186 &link->bssid);
1187 if (r < 0)
1188 return r;
1189 if (r == 0)
1190 continue;
1191
1192 if (network->match.ifname && link->dev) {
1193 uint8_t name_assign_type = NET_NAME_UNKNOWN;
1194 const char *attr;
1195
1196 if (sd_device_get_sysattr_value(link->dev, "name_assign_type", &attr) >= 0)
1197 (void) safe_atou8(attr, &name_assign_type);
1198
1199 warn = name_assign_type == NET_NAME_ENUM;
1200 }
1201
1202 log_link_full(link, warn ? LOG_WARNING : LOG_DEBUG,
1203 "found matching network '%s'%s.",
1204 network->filename,
1205 warn ? ", based on potentially unpredictable interface name" : "");
1206
1207 if (network->unmanaged)
1208 return -ENOENT;
1209
1210 *ret = network;
1211 return 0;
1212 }
1213
1214 return -ENOENT;
1215 }
1216
1217 int link_reconfigure_impl(Link *link, bool force) {
1218 Network *network = NULL;
1219 NetDev *netdev = NULL;
1220 int r;
1221
1222 assert(link);
1223
1224 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
1225 return 0;
1226
1227 r = netdev_get(link->manager, link->ifname, &netdev);
1228 if (r < 0 && r != -ENOENT)
1229 return r;
1230
1231 r = link_get_network(link, &network);
1232 if (r < 0 && r != -ENOENT)
1233 return r;
1234
1235 if (link->state != LINK_STATE_UNMANAGED && !network)
1236 /* If link is in initialized state, then link->network is also NULL. */
1237 force = true;
1238
1239 if (link->network == network && !force)
1240 return 0;
1241
1242 if (network) {
1243 _cleanup_free_ char *joined = strv_join(network->dropins, ", ");
1244
1245 if (link->state == LINK_STATE_INITIALIZED)
1246 log_link_info(link, "Configuring with %s%s%s%s.",
1247 network->filename,
1248 isempty(joined) ? "" : " (dropins: ",
1249 joined,
1250 isempty(joined) ? "" : ")");
1251 else
1252 log_link_info(link, "Reconfiguring with %s%s%s%s.",
1253 network->filename,
1254 isempty(joined) ? "" : " (dropins: ",
1255 joined,
1256 isempty(joined) ? "" : ")");
1257 } else
1258 log_link_full(link, link->state == LINK_STATE_INITIALIZED ? LOG_DEBUG : LOG_INFO,
1259 "Unmanaging interface.");
1260
1261 /* Dropping old .network file */
1262 r = link_stop_engines(link, false);
1263 if (r < 0)
1264 return r;
1265
1266 link_drop_requests(link);
1267
1268 if (network && !force && network->keep_configuration != KEEP_CONFIGURATION_YES)
1269 /* When a new/updated .network file is assigned, first make all configs (addresses,
1270 * routes, and so on) foreign, and then drop unnecessary configs later by
1271 * link_drop_foreign_config() in link_configure().
1272 * Note, when KeepConfiguration=yes, link_drop_foreign_config() does nothing. Hence,
1273 * here we need to drop the configs such as addresses, routes, and so on configured by
1274 * the previously assigned .network file. */
1275 link_foreignize_config(link);
1276 else {
1277 /* Remove all managed configs. Note, foreign configs are removed in later by
1278 * link_configure() -> link_drop_foreign_config() if the link is managed by us. */
1279 r = link_drop_managed_config(link);
1280 if (r < 0)
1281 return r;
1282 }
1283
1284 /* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the
1285 * bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will
1286 * not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the
1287 * map here, as it depends on .network files assigned to other links. */
1288 link_free_bound_to_list(link);
1289
1290 link_free_engines(link);
1291 link->network = network_unref(link->network);
1292
1293 netdev_unref(link->netdev);
1294 link->netdev = netdev_ref(netdev);
1295
1296 if (!network) {
1297 link_set_state(link, LINK_STATE_UNMANAGED);
1298 return 0;
1299 }
1300
1301 /* Then, apply new .network file */
1302 link->network = network_ref(network);
1303 link_update_operstate(link, true);
1304 link_dirty(link);
1305
1306 link_set_state(link, LINK_STATE_INITIALIZED);
1307 link->activated = false;
1308
1309 r = link_configure(link);
1310 if (r < 0)
1311 return r;
1312
1313 return 1;
1314 }
1315
1316 static int link_reconfigure_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, bool force) {
1317 int r;
1318
1319 assert(link);
1320
1321 r = link_getlink_handler_internal(rtnl, m, link, "Failed to update link state");
1322 if (r <= 0)
1323 return r;
1324
1325 r = link_reconfigure_impl(link, force);
1326 if (r < 0) {
1327 link_enter_failed(link);
1328 return 0;
1329 }
1330
1331 return r;
1332 }
1333
1334 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1335 return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ false);
1336 }
1337
1338 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1339 return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ true);
1340 }
1341
1342 int link_reconfigure(Link *link, bool force) {
1343 int r;
1344
1345 assert(link);
1346
1347 /* When link in pending or initialized state, then link_configure() will be called. To prevent
1348 * the function from being called multiple times simultaneously, refuse to reconfigure the
1349 * interface in these cases. */
1350 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
1351 return 0; /* 0 means no-op. */
1352
1353 r = link_call_getlink(link, force ? link_force_reconfigure_handler : link_reconfigure_handler);
1354 if (r < 0)
1355 return r;
1356
1357 return 1; /* 1 means the interface will be reconfigured. */
1358 }
1359
1360 static int link_initialized_and_synced(Link *link) {
1361 int r;
1362
1363 assert(link);
1364 assert(link->manager);
1365
1366 if (link->manager->test_mode) {
1367 log_link_debug(link, "Running in test mode, refusing to enter initialized state.");
1368 link_set_state(link, LINK_STATE_UNMANAGED);
1369 return 0;
1370 }
1371
1372 if (link->state == LINK_STATE_PENDING) {
1373 log_link_debug(link, "Link state is up-to-date");
1374 link_set_state(link, LINK_STATE_INITIALIZED);
1375
1376 r = link_new_bound_by_list(link);
1377 if (r < 0)
1378 return r;
1379
1380 r = link_handle_bound_by_list(link);
1381 if (r < 0)
1382 return r;
1383 }
1384
1385 return link_reconfigure_impl(link, /* force = */ false);
1386 }
1387
1388 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1389 int r;
1390
1391 r = link_getlink_handler_internal(rtnl, m, link, "Failed to wait for the interface to be initialized");
1392 if (r <= 0)
1393 return r;
1394
1395 r = link_initialized_and_synced(link);
1396 if (r < 0)
1397 link_enter_failed(link);
1398
1399 return 0;
1400 }
1401
1402 static int link_initialized(Link *link, sd_device *device) {
1403 int r;
1404
1405 assert(link);
1406 assert(device);
1407
1408 /* Always replace with the new sd_device object. As the sysname (and possibly other properties
1409 * or sysattrs) may be outdated. */
1410 device_unref_and_replace(link->dev, device);
1411
1412 if (link->dhcp_client) {
1413 r = sd_dhcp_client_attach_device(link->dhcp_client, link->dev);
1414 if (r < 0)
1415 log_link_warning_errno(link, r, "Failed to attach device to DHCPv4 client, ignoring: %m");
1416 }
1417
1418 if (link->dhcp6_client) {
1419 r = sd_dhcp6_client_attach_device(link->dhcp6_client, link->dev);
1420 if (r < 0)
1421 log_link_warning_errno(link, r, "Failed to attach device to DHCPv6 client, ignoring: %m");
1422 }
1423
1424 r = link_set_sr_iov_ifindices(link);
1425 if (r < 0)
1426 log_link_warning_errno(link, r, "Failed to manage SR-IOV PF and VF ports, ignoring: %m");
1427
1428 if (link->state != LINK_STATE_PENDING)
1429 return link_reconfigure(link, /* force = */ false);
1430
1431 log_link_debug(link, "udev initialized link");
1432
1433 /* udev has initialized the link, but we don't know if we have yet
1434 * processed the NEWLINK messages with the latest state. Do a GETLINK,
1435 * when it returns we know that the pending NEWLINKs have already been
1436 * processed and that we are up-to-date */
1437
1438 return link_call_getlink(link, link_initialized_handler);
1439 }
1440
1441 static int link_check_initialized(Link *link) {
1442 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
1443 int r;
1444
1445 assert(link);
1446
1447 if (!udev_available())
1448 return link_initialized_and_synced(link);
1449
1450 /* udev should be around */
1451 r = sd_device_new_from_ifindex(&device, link->ifindex);
1452 if (r < 0) {
1453 log_link_debug_errno(link, r, "Could not find device, waiting for device initialization: %m");
1454 return 0;
1455 }
1456
1457 r = sd_device_get_is_initialized(device);
1458 if (r < 0)
1459 return log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
1460 if (r == 0) {
1461 /* not yet ready */
1462 log_link_debug(link, "link pending udev initialization...");
1463 return 0;
1464 }
1465
1466 r = device_is_renaming(device);
1467 if (r < 0)
1468 return log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
1469 if (r > 0) {
1470 log_link_debug(link, "Interface is being renamed, pending initialization.");
1471 return 0;
1472 }
1473
1474 return link_initialized(link, device);
1475 }
1476
1477 int manager_udev_process_link(Manager *m, sd_device *device, sd_device_action_t action) {
1478 int r, ifindex;
1479 const char *s;
1480 Link *link;
1481
1482 assert(m);
1483 assert(device);
1484
1485 r = sd_device_get_ifindex(device, &ifindex);
1486 if (r < 0)
1487 return log_device_debug_errno(device, r, "Failed to get ifindex: %m");
1488
1489 r = link_get_by_index(m, ifindex, &link);
1490 if (r < 0) {
1491 /* This error is not critical, as the corresponding rtnl message may be received later. */
1492 log_device_debug_errno(device, r, "Failed to get link from ifindex %i, ignoring: %m", ifindex);
1493 return 0;
1494 }
1495
1496 /* Let's unref the sd-device object assigned to the corresponding Link object, but keep the Link
1497 * object here. It will be removed only when rtnetlink says so. */
1498 if (action == SD_DEVICE_REMOVE) {
1499 link->dev = sd_device_unref(link->dev);
1500 return 0;
1501 }
1502
1503 r = device_is_renaming(device);
1504 if (r < 0)
1505 return log_device_debug_errno(device, r, "Failed to determine if the device is renaming or not: %m");
1506 if (r > 0) {
1507 log_device_debug(device, "Device is renaming, waiting for the interface to be renamed.");
1508 /* TODO:
1509 * What happens when a device is initialized, then soon renamed after that? When we detect
1510 * such, maybe we should cancel or postpone all queued requests for the interface. */
1511 return 0;
1512 }
1513
1514 r = sd_device_get_property_value(device, "ID_NET_MANAGED_BY", &s);
1515 if (r < 0 && r != -ENOENT)
1516 log_device_debug_errno(device, r, "Failed to get ID_NET_MANAGED_BY udev property, ignoring: %m");
1517 if (r >= 0 && !streq(s, "io.systemd.Network")) {
1518 log_device_debug(device, "Interface is requested to be managed by '%s', not managing the interface.", s);
1519 link_set_state(link, LINK_STATE_UNMANAGED);
1520 return 0;
1521 }
1522
1523 r = link_initialized(link, device);
1524 if (r < 0)
1525 link_enter_failed(link);
1526
1527 return 0;
1528 }
1529
1530 static int link_carrier_gained(Link *link) {
1531 bool force_reconfigure;
1532 int r;
1533
1534 assert(link);
1535
1536 r = event_source_disable(link->carrier_lost_timer);
1537 if (r < 0)
1538 log_link_warning_errno(link, r, "Failed to disable carrier lost timer, ignoring: %m");
1539
1540 /* If a wireless interface was connected to an access point, and the SSID is changed (that is,
1541 * both previous_ssid and ssid are non-NULL), then the connected wireless network could be
1542 * changed. So, always reconfigure the link. Which means e.g. the DHCP client will be
1543 * restarted, and the correct network information will be gained.
1544 *
1545 * However, do not reconfigure the wireless interface forcibly if it was not connected to any
1546 * access points previously (previous_ssid is NULL in this case). As, a .network file may be
1547 * already assigned to the interface (in that case, the .network file does not have the SSID=
1548 * setting in the [Match] section), and the interface is already being configured. Of course,
1549 * there may exist another .network file with higher priority and a matching SSID= setting. But
1550 * in that case, link_reconfigure_impl() can handle that without the force_reconfigure flag.
1551 *
1552 * For non-wireless interfaces, we have no way to detect the connected network change. So,
1553 * setting force_reconfigure = false. Note, both ssid and previous_ssid are NULL in that case. */
1554 force_reconfigure = link->previous_ssid && !streq_ptr(link->previous_ssid, link->ssid);
1555 link->previous_ssid = mfree(link->previous_ssid);
1556
1557 /* AP and P2P-GO interfaces may have a new SSID - update the link properties in case a new .network
1558 * profile wants to match on it with SSID= in its [Match] section.
1559 */
1560 if (IN_SET(link->wlan_iftype, NL80211_IFTYPE_AP, NL80211_IFTYPE_P2P_GO)) {
1561 r = link_get_wlan_interface(link);
1562 if (r < 0)
1563 return r;
1564 }
1565
1566 /* At this stage, both wlan and link information should be up-to-date. Hence, it is not necessary to
1567 * call RTM_GETLINK, NL80211_CMD_GET_INTERFACE, or NL80211_CMD_GET_STATION commands, and simply call
1568 * link_reconfigure_impl(). Note, link_reconfigure_impl() returns 1 when the link is reconfigured. */
1569 r = link_reconfigure_impl(link, force_reconfigure);
1570 if (r != 0)
1571 return r;
1572
1573 r = link_handle_bound_by_list(link);
1574 if (r < 0)
1575 return r;
1576
1577 if (link->iftype == ARPHRD_CAN)
1578 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1579 return 0;
1580
1581 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
1582 r = link_acquire_dynamic_conf(link);
1583 if (r < 0)
1584 return r;
1585
1586 r = link_request_static_configs(link);
1587 if (r < 0)
1588 return r;
1589 }
1590
1591 return 0;
1592 }
1593
1594 static int link_carrier_lost_impl(Link *link) {
1595 int r, ret = 0;
1596
1597 assert(link);
1598
1599 link->previous_ssid = mfree(link->previous_ssid);
1600
1601 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1602 return 0;
1603
1604 if (!link->network)
1605 return 0;
1606
1607 r = link_stop_engines(link, false);
1608 if (r < 0)
1609 ret = r;
1610
1611 r = link_drop_managed_config(link);
1612 if (r < 0 && ret >= 0)
1613 ret = r;
1614
1615 return ret;
1616 }
1617
1618 static int link_carrier_lost_handler(sd_event_source *s, uint64_t usec, void *userdata) {
1619 Link *link = ASSERT_PTR(userdata);
1620 int r;
1621
1622 r = link_carrier_lost_impl(link);
1623 if (r < 0) {
1624 log_link_warning_errno(link, r, "Failed to process carrier lost event: %m");
1625 link_enter_failed(link);
1626 }
1627
1628 return 0;
1629 }
1630
1631 static int link_carrier_lost(Link *link) {
1632 uint16_t dhcp_mtu;
1633 usec_t usec;
1634 int r;
1635
1636 assert(link);
1637
1638 r = link_handle_bound_by_list(link);
1639 if (r < 0)
1640 return r;
1641
1642 if (link->iftype == ARPHRD_CAN)
1643 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1644 return 0;
1645
1646 if (!link->network)
1647 return 0;
1648
1649 if (link->network->ignore_carrier_loss_set)
1650 /* If IgnoreCarrierLoss= is explicitly specified, then use the specified value. */
1651 usec = link->network->ignore_carrier_loss_usec;
1652
1653 else if (link->network->bond && link->wlan_iftype > 0)
1654 /* Enslaving wlan interface to a bond disconnects from the connected AP, and causes its
1655 * carrier to be lost. See #19832. */
1656 usec = 3 * USEC_PER_SEC;
1657
1658 else if (link->network->dhcp_use_mtu &&
1659 link->dhcp_lease &&
1660 sd_dhcp_lease_get_mtu(link->dhcp_lease, &dhcp_mtu) >= 0 &&
1661 dhcp_mtu != link->original_mtu)
1662 /* Some drivers reset interfaces when changing MTU. Resetting interfaces by the static
1663 * MTU should not cause any issues, as MTU is changed only once. However, setting MTU
1664 * through DHCP lease causes an infinite loop of resetting the interface. See #18738. */
1665 usec = 5 * USEC_PER_SEC;
1666
1667 else
1668 /* Otherwise, use the implied default value. */
1669 usec = link->network->ignore_carrier_loss_usec;
1670
1671 if (usec == USEC_INFINITY)
1672 return 0;
1673
1674 if (usec == 0)
1675 return link_carrier_lost_impl(link);
1676
1677 return event_reset_time_relative(link->manager->event,
1678 &link->carrier_lost_timer,
1679 CLOCK_BOOTTIME,
1680 usec,
1681 0,
1682 link_carrier_lost_handler,
1683 link,
1684 0,
1685 "link-carrier-loss",
1686 true);
1687 }
1688
1689 static int link_admin_state_up(Link *link) {
1690 int r;
1691
1692 assert(link);
1693
1694 /* This is called every time an interface admin state changes to up;
1695 * specifically, when IFF_UP flag changes from unset to set. */
1696
1697 if (!link->network)
1698 return 0;
1699
1700 if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_DOWN) {
1701 log_link_info(link, "Activation policy is \"always-down\", forcing link down.");
1702 return link_request_to_bring_up_or_down(link, /* up = */ false);
1703 }
1704
1705 /* We set the ipv6 mtu after the device mtu, but the kernel resets
1706 * ipv6 mtu on NETDEV_UP, so we need to reset it. */
1707 r = link_set_ipv6_mtu(link);
1708 if (r < 0)
1709 log_link_warning_errno(link, r, "Cannot set IPv6 MTU, ignoring: %m");
1710
1711 return 0;
1712 }
1713
1714 static int link_admin_state_down(Link *link) {
1715 assert(link);
1716
1717 if (!link->network)
1718 return 0;
1719
1720 if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) {
1721 log_link_info(link, "Activation policy is \"always-up\", forcing link up.");
1722 return link_request_to_bring_up_or_down(link, /* up = */ true);
1723 }
1724
1725 return 0;
1726 }
1727
1728 static bool link_is_enslaved(Link *link) {
1729 if (link->flags & IFF_SLAVE)
1730 return true;
1731
1732 if (link->master_ifindex > 0)
1733 return true;
1734
1735 return false;
1736 }
1737
1738 void link_update_operstate(Link *link, bool also_update_master) {
1739 LinkOperationalState operstate;
1740 LinkCarrierState carrier_state;
1741 LinkAddressState ipv4_address_state, ipv6_address_state, address_state;
1742 LinkOnlineState online_state;
1743 _cleanup_strv_free_ char **p = NULL;
1744 bool changed = false;
1745
1746 assert(link);
1747
1748 if (link->kernel_operstate == IF_OPER_DORMANT)
1749 carrier_state = LINK_CARRIER_STATE_DORMANT;
1750 else if (link_has_carrier(link)) {
1751 if (link_is_enslaved(link))
1752 carrier_state = LINK_CARRIER_STATE_ENSLAVED;
1753 else
1754 carrier_state = LINK_CARRIER_STATE_CARRIER;
1755 } else if (link->flags & IFF_UP)
1756 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
1757 else
1758 carrier_state = LINK_CARRIER_STATE_OFF;
1759
1760 if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
1761 Link *slave;
1762
1763 SET_FOREACH(slave, link->slaves) {
1764 link_update_operstate(slave, false);
1765
1766 if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
1767 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
1768 }
1769 }
1770
1771 link_get_address_states(link, &ipv4_address_state, &ipv6_address_state, &address_state);
1772
1773 /* Mapping of address and carrier state vs operational state
1774 * carrier state
1775 * | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
1776 * ------------------------------------------------------------------------------
1777 * off | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
1778 * address_state degraded | off | no-carrier | dormant | degraded | degraded | enslaved
1779 * routable | off | no-carrier | dormant | routable | routable | routable
1780 */
1781
1782 if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_ROUTABLE)
1783 operstate = LINK_OPERSTATE_ROUTABLE;
1784 else if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_DEGRADED)
1785 operstate = LINK_OPERSTATE_DEGRADED;
1786 else if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
1787 operstate = (LinkOperationalState) carrier_state;
1788 else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
1789 operstate = LINK_OPERSTATE_ROUTABLE;
1790 else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
1791 operstate = LINK_OPERSTATE_DEGRADED;
1792 else
1793 operstate = LINK_OPERSTATE_ENSLAVED;
1794
1795 /* Only determine online state for managed links with RequiredForOnline=yes */
1796 if (!link->network || !link->network->required_for_online)
1797 online_state = _LINK_ONLINE_STATE_INVALID;
1798 else if (operstate < link->network->required_operstate_for_online.min ||
1799 operstate > link->network->required_operstate_for_online.max)
1800 online_state = LINK_ONLINE_STATE_OFFLINE;
1801 else {
1802 AddressFamily required_family = link->network->required_family_for_online;
1803 bool needs_ipv4 = required_family & ADDRESS_FAMILY_IPV4;
1804 bool needs_ipv6 = required_family & ADDRESS_FAMILY_IPV6;
1805
1806 /* The operational state is within the range required for online.
1807 * If a particular address family is also required, we might revert
1808 * to offline in the blocks below. */
1809 online_state = LINK_ONLINE_STATE_ONLINE;
1810
1811 if (link->network->required_operstate_for_online.min >= LINK_OPERSTATE_DEGRADED) {
1812 if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_DEGRADED)
1813 online_state = LINK_ONLINE_STATE_OFFLINE;
1814 if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_DEGRADED)
1815 online_state = LINK_ONLINE_STATE_OFFLINE;
1816 }
1817
1818 if (link->network->required_operstate_for_online.min >= LINK_OPERSTATE_ROUTABLE) {
1819 if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1820 online_state = LINK_ONLINE_STATE_OFFLINE;
1821 if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1822 online_state = LINK_ONLINE_STATE_OFFLINE;
1823 }
1824 }
1825
1826 if (link->carrier_state != carrier_state) {
1827 link->carrier_state = carrier_state;
1828 changed = true;
1829 if (strv_extend(&p, "CarrierState") < 0)
1830 log_oom();
1831 }
1832
1833 if (link->address_state != address_state) {
1834 link->address_state = address_state;
1835 changed = true;
1836 if (strv_extend(&p, "AddressState") < 0)
1837 log_oom();
1838 }
1839
1840 if (link->ipv4_address_state != ipv4_address_state) {
1841 link->ipv4_address_state = ipv4_address_state;
1842 changed = true;
1843 if (strv_extend(&p, "IPv4AddressState") < 0)
1844 log_oom();
1845 }
1846
1847 if (link->ipv6_address_state != ipv6_address_state) {
1848 link->ipv6_address_state = ipv6_address_state;
1849 changed = true;
1850 if (strv_extend(&p, "IPv6AddressState") < 0)
1851 log_oom();
1852 }
1853
1854 if (link->operstate != operstate) {
1855 link->operstate = operstate;
1856 changed = true;
1857 if (strv_extend(&p, "OperationalState") < 0)
1858 log_oom();
1859 }
1860
1861 if (link->online_state != online_state) {
1862 link->online_state = online_state;
1863 changed = true;
1864 if (strv_extend(&p, "OnlineState") < 0)
1865 log_oom();
1866 }
1867
1868 if (p)
1869 link_send_changed_strv(link, p);
1870 if (changed)
1871 link_dirty(link);
1872
1873 if (also_update_master) {
1874 Link *master;
1875
1876 if (link_get_master(link, &master) >= 0)
1877 link_update_operstate(master, true);
1878 }
1879 }
1880
1881 #define FLAG_STRING(string, flag, old, new) \
1882 (((old ^ new) & flag) \
1883 ? ((old & flag) ? (" -" string) : (" +" string)) \
1884 : "")
1885
1886 static int link_update_flags(Link *link, sd_netlink_message *message) {
1887 bool link_was_admin_up, had_carrier;
1888 uint8_t operstate;
1889 unsigned flags;
1890 int r;
1891
1892 assert(link);
1893 assert(message);
1894
1895 r = sd_rtnl_message_link_get_flags(message, &flags);
1896 if (r < 0)
1897 return log_link_debug_errno(link, r, "rtnl: failed to read link flags: %m");
1898
1899 r = sd_netlink_message_read_u8(message, IFLA_OPERSTATE, &operstate);
1900 if (r == -ENODATA)
1901 /* If we got a message without operstate, assume the state was unchanged. */
1902 operstate = link->kernel_operstate;
1903 else if (r < 0)
1904 return log_link_debug_errno(link, r, "rtnl: failed to read operational state: %m");
1905
1906 if (link->flags == flags && link->kernel_operstate == operstate)
1907 return 0;
1908
1909 if (link->flags != flags) {
1910 unsigned unknown_flags, unknown_flags_added, unknown_flags_removed;
1911
1912 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",
1913 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
1914 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
1915 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
1916 FLAG_STRING("UP", IFF_UP, link->flags, flags),
1917 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
1918 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
1919 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
1920 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
1921 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
1922 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
1923 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
1924 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
1925 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
1926 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
1927 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
1928 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
1929 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
1930 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
1931 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
1932
1933 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
1934 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
1935 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
1936 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
1937 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
1938 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
1939 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
1940 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
1941
1942 if (unknown_flags_added)
1943 log_link_debug(link, "Unknown link flags gained, ignoring: %#.5x", unknown_flags_added);
1944
1945 if (unknown_flags_removed)
1946 log_link_debug(link, "Unknown link flags lost, ignoring: %#.5x", unknown_flags_removed);
1947 }
1948
1949 link_was_admin_up = link->flags & IFF_UP;
1950 had_carrier = link_has_carrier(link);
1951
1952 link->flags = flags;
1953 link->kernel_operstate = operstate;
1954
1955 link_update_operstate(link, true);
1956
1957 if (!link_was_admin_up && (link->flags & IFF_UP)) {
1958 log_link_info(link, "Link UP");
1959
1960 r = link_admin_state_up(link);
1961 if (r < 0)
1962 return r;
1963 } else if (link_was_admin_up && !(link->flags & IFF_UP)) {
1964 log_link_info(link, "Link DOWN");
1965
1966 r = link_admin_state_down(link);
1967 if (r < 0)
1968 return r;
1969 }
1970
1971 if (!had_carrier && link_has_carrier(link)) {
1972 log_link_info(link, "Gained carrier");
1973
1974 r = link_carrier_gained(link);
1975 if (r < 0)
1976 return r;
1977 } else if (had_carrier && !link_has_carrier(link)) {
1978 log_link_info(link, "Lost carrier");
1979
1980 r = link_carrier_lost(link);
1981 if (r < 0)
1982 return r;
1983 }
1984
1985 return 0;
1986 }
1987
1988 static int link_update_master(Link *link, sd_netlink_message *message) {
1989 int master_ifindex, r;
1990
1991 assert(link);
1992 assert(message);
1993
1994 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t*) &master_ifindex);
1995 if (r == -ENODATA)
1996 return 0;
1997 if (r < 0)
1998 return log_link_debug_errno(link, r, "rtnl: failed to read master ifindex: %m");
1999
2000 if (master_ifindex == link->ifindex)
2001 master_ifindex = 0;
2002
2003 if (master_ifindex == link->master_ifindex)
2004 return 0;
2005
2006 if (link->master_ifindex == 0)
2007 log_link_debug(link, "Attached to master interface: %i", master_ifindex);
2008 else if (master_ifindex == 0)
2009 log_link_debug(link, "Detached from master interface: %i", link->master_ifindex);
2010 else
2011 log_link_debug(link, "Master interface changed: %i %s %i", link->master_ifindex,
2012 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), master_ifindex);
2013
2014 link_drop_from_master(link);
2015
2016 link->master_ifindex = master_ifindex;
2017
2018 r = link_append_to_master(link);
2019 if (r < 0)
2020 return log_link_debug_errno(link, r, "Failed to append link to master: %m");
2021
2022 return 0;
2023 }
2024
2025 static int link_update_driver(Link *link, sd_netlink_message *message) {
2026 int r;
2027
2028 assert(link);
2029 assert(link->manager);
2030 assert(message);
2031
2032 /* Driver is already read. Assuming the driver is never changed. */
2033 if (link->ethtool_driver_read)
2034 return 0;
2035
2036 /* When udevd is running, read the driver after the interface is initialized by udevd.
2037 * Otherwise, ethtool may not work correctly. See issue #22538.
2038 * When udevd is not running, read the value when the interface is detected. */
2039 if (udev_available() && !link->dev)
2040 return 0;
2041
2042 link->ethtool_driver_read = true;
2043
2044 r = ethtool_get_driver(&link->manager->ethtool_fd, link->ifname, &link->driver);
2045 if (r < 0) {
2046 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
2047 return 0;
2048 }
2049
2050 log_link_debug(link, "Found driver: %s", strna(link->driver));
2051
2052 if (streq_ptr(link->driver, "dsa")) {
2053 uint32_t dsa_master_ifindex = 0;
2054
2055 r = sd_netlink_message_read_u32(message, IFLA_LINK, &dsa_master_ifindex);
2056 if (r < 0 && r != -ENODATA)
2057 return log_link_debug_errno(link, r, "rtnl: failed to read ifindex of the DSA master interface: %m");
2058
2059 if (dsa_master_ifindex > INT_MAX) {
2060 log_link_debug(link, "rtnl: received too large DSA master ifindex (%"PRIu32" > INT_MAX), ignoring.",
2061 dsa_master_ifindex);
2062 dsa_master_ifindex = 0;
2063 }
2064
2065 link->dsa_master_ifindex = (int) dsa_master_ifindex;
2066 }
2067
2068 return 1; /* needs reconfigure */
2069 }
2070
2071 static int link_update_permanent_hardware_address_from_ethtool(Link *link, sd_netlink_message *message) {
2072 int r;
2073
2074 assert(link);
2075 assert(link->manager);
2076 assert(message);
2077
2078 if (link->ethtool_permanent_hw_addr_read)
2079 return 0;
2080
2081 /* When udevd is running, read the permanent hardware address after the interface is
2082 * initialized by udevd. Otherwise, ethtool may not work correctly. See issue #22538.
2083 * When udevd is not running, read the value when the interface is detected. */
2084 if (udev_available() && !link->dev)
2085 return 0;
2086
2087 /* If the interface does not have a hardware address, then it will not have a permanent address either. */
2088 r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, NULL);
2089 if (r == -ENODATA)
2090 return 0;
2091 if (r < 0)
2092 return log_link_debug_errno(link, r, "Failed to read IFLA_ADDRESS attribute: %m");
2093
2094 link->ethtool_permanent_hw_addr_read = true;
2095
2096 r = ethtool_get_permanent_hw_addr(&link->manager->ethtool_fd, link->ifname, &link->permanent_hw_addr);
2097 if (r < 0)
2098 log_link_debug_errno(link, r, "Permanent hardware address not found, continuing without: %m");
2099
2100 return 0;
2101 }
2102
2103 static int link_update_permanent_hardware_address(Link *link, sd_netlink_message *message) {
2104 int r;
2105
2106 assert(link);
2107 assert(link->manager);
2108 assert(message);
2109
2110 if (link->permanent_hw_addr.length > 0)
2111 return 0;
2112
2113 r = netlink_message_read_hw_addr(message, IFLA_PERM_ADDRESS, &link->permanent_hw_addr);
2114 if (r < 0) {
2115 if (r != -ENODATA)
2116 return log_link_debug_errno(link, r, "Failed to read IFLA_PERM_ADDRESS attribute: %m");
2117
2118 /* Fallback to ethtool for older kernels. */
2119 r = link_update_permanent_hardware_address_from_ethtool(link, message);
2120 if (r < 0)
2121 return r;
2122 }
2123
2124 if (link->permanent_hw_addr.length > 0)
2125 log_link_debug(link, "Saved permanent hardware address: %s", HW_ADDR_TO_STR(&link->permanent_hw_addr));
2126
2127 return 1; /* needs reconfigure */
2128 }
2129
2130 static int link_update_hardware_address(Link *link, sd_netlink_message *message) {
2131 struct hw_addr_data addr;
2132 int r;
2133
2134 assert(link);
2135 assert(message);
2136
2137 r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr);
2138 if (r < 0 && r != -ENODATA)
2139 return log_link_debug_errno(link, r, "rtnl: failed to read broadcast address: %m");
2140
2141 r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &addr);
2142 if (r == -ENODATA)
2143 return 0;
2144 if (r < 0)
2145 return log_link_debug_errno(link, r, "rtnl: failed to read hardware address: %m");
2146
2147 if (hw_addr_equal(&link->hw_addr, &addr))
2148 return 0;
2149
2150 if (link->hw_addr.length == 0)
2151 log_link_debug(link, "Saved hardware address: %s", HW_ADDR_TO_STR(&addr));
2152 else {
2153 log_link_debug(link, "Hardware address is changed: %s %s %s",
2154 HW_ADDR_TO_STR(&link->hw_addr),
2155 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT),
2156 HW_ADDR_TO_STR(&addr));
2157
2158 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
2159 }
2160
2161 link->hw_addr = addr;
2162
2163 if (!hw_addr_is_null(&link->hw_addr)) {
2164 r = hashmap_ensure_put(&link->manager->links_by_hw_addr, &hw_addr_hash_ops, &link->hw_addr, link);
2165 if (r == -EEXIST && streq_ptr(link->kind, "bond"))
2166 /* bonding master and its slaves have the same hardware address. */
2167 r = hashmap_replace(link->manager->links_by_hw_addr, &link->hw_addr, link);
2168 if (r < 0)
2169 log_link_debug_errno(link, r, "Failed to manage link by its new hardware address, ignoring: %m");
2170 }
2171
2172 r = ipv4acd_update_mac(link);
2173 if (r < 0)
2174 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m");
2175
2176 r = ipv4ll_update_mac(link);
2177 if (r < 0)
2178 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
2179
2180 r = dhcp4_update_mac(link);
2181 if (r < 0)
2182 return log_link_debug_errno(link, r, "Could not update MAC address in DHCP client: %m");
2183
2184 r = dhcp6_update_mac(link);
2185 if (r < 0)
2186 return log_link_debug_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
2187
2188 r = radv_update_mac(link);
2189 if (r < 0)
2190 return log_link_debug_errno(link, r, "Could not update MAC address for Router Advertisement: %m");
2191
2192 if (link->ndisc && link->hw_addr.length == ETH_ALEN) {
2193 r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether);
2194 if (r < 0)
2195 return log_link_debug_errno(link, r, "Could not update MAC for NDisc: %m");
2196 }
2197
2198 if (link->lldp_rx) {
2199 r = sd_lldp_rx_set_filter_address(link->lldp_rx, &link->hw_addr.ether);
2200 if (r < 0)
2201 return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Rx: %m");
2202 }
2203
2204 if (link->lldp_tx) {
2205 r = sd_lldp_tx_set_hwaddr(link->lldp_tx, &link->hw_addr.ether);
2206 if (r < 0)
2207 return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Tx: %m");
2208 }
2209
2210 return 1; /* needs reconfigure */
2211 }
2212
2213 static int link_update_mtu(Link *link, sd_netlink_message *message) {
2214 uint32_t mtu, min_mtu = 0, max_mtu = UINT32_MAX;
2215 int r;
2216
2217 assert(link);
2218 assert(message);
2219
2220 r = sd_netlink_message_read_u32(message, IFLA_MTU, &mtu);
2221 if (r == -ENODATA)
2222 return 0;
2223 if (r < 0)
2224 return log_link_debug_errno(link, r, "rtnl: failed to read MTU in RTM_NEWLINK message: %m");
2225 if (mtu == 0)
2226 return 0;
2227
2228 r = sd_netlink_message_read_u32(message, IFLA_MIN_MTU, &min_mtu);
2229 if (r < 0 && r != -ENODATA)
2230 return log_link_debug_errno(link, r, "rtnl: failed to read minimum MTU in RTM_NEWLINK message: %m");
2231
2232 r = sd_netlink_message_read_u32(message, IFLA_MAX_MTU, &max_mtu);
2233 if (r < 0 && r != -ENODATA)
2234 return log_link_debug_errno(link, r, "rtnl: failed to read maximum MTU in RTM_NEWLINK message: %m");
2235
2236 if (max_mtu == 0)
2237 max_mtu = UINT32_MAX;
2238
2239 link->min_mtu = min_mtu;
2240 link->max_mtu = max_mtu;
2241
2242 if (link->original_mtu == 0) {
2243 link->original_mtu = mtu;
2244 log_link_debug(link, "Saved original MTU %" PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2245 link->original_mtu, link->min_mtu, link->max_mtu);
2246 }
2247
2248 if (link->mtu == mtu)
2249 return 0;
2250
2251 if (link->mtu != 0)
2252 log_link_debug(link, "MTU is changed: %"PRIu32" %s %"PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2253 link->mtu, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), mtu,
2254 link->min_mtu, link->max_mtu);
2255
2256 link->mtu = mtu;
2257
2258 if (link->dhcp_client) {
2259 r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
2260 if (r < 0)
2261 return log_link_debug_errno(link, r, "Could not update MTU in DHCP client: %m");
2262 }
2263
2264 if (link->radv) {
2265 r = sd_radv_set_mtu(link->radv, link->mtu);
2266 if (r < 0)
2267 return log_link_debug_errno(link, r, "Could not set MTU for Router Advertisement: %m");
2268 }
2269
2270 return 0;
2271 }
2272
2273 static int link_update_alternative_names(Link *link, sd_netlink_message *message) {
2274 _cleanup_strv_free_ char **altnames = NULL;
2275 int r;
2276
2277 assert(link);
2278 assert(message);
2279
2280 r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &altnames);
2281 if (r == -ENODATA)
2282 /* The message does not have IFLA_PROP_LIST container attribute. It does not mean the
2283 * interface has no alternative name. */
2284 return 0;
2285 if (r < 0)
2286 return log_link_debug_errno(link, r, "rtnl: failed to read alternative names: %m");
2287
2288 if (strv_equal(altnames, link->alternative_names))
2289 return 0;
2290
2291 STRV_FOREACH(n, link->alternative_names)
2292 hashmap_remove(link->manager->links_by_name, *n);
2293
2294 strv_free_and_replace(link->alternative_names, altnames);
2295
2296 STRV_FOREACH(n, link->alternative_names) {
2297 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, *n, link);
2298 if (r < 0)
2299 return log_link_debug_errno(link, r, "Failed to manage link by its new alternative names: %m");
2300 }
2301
2302 return 1; /* needs reconfigure */
2303 }
2304
2305 static int link_update_name(Link *link, sd_netlink_message *message) {
2306 char ifname_from_index[IF_NAMESIZE];
2307 const char *ifname;
2308 int r;
2309
2310 assert(link);
2311 assert(message);
2312
2313 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
2314 if (r == -ENODATA)
2315 /* Hmm?? But ok. */
2316 return 0;
2317 if (r < 0)
2318 return log_link_debug_errno(link, r, "Failed to read interface name in RTM_NEWLINK message: %m");
2319
2320 if (streq(ifname, link->ifname))
2321 return 0;
2322
2323 r = format_ifname(link->ifindex, ifname_from_index);
2324 if (r < 0)
2325 return log_link_debug_errno(link, r, "Could not get interface name for index %i.", link->ifindex);
2326
2327 if (!streq(ifname, ifname_from_index)) {
2328 log_link_debug(link, "New interface name '%s' received from the kernel does not correspond "
2329 "with the name currently configured on the actual interface '%s'. Ignoring.",
2330 ifname, ifname_from_index);
2331 return 0;
2332 }
2333
2334 log_link_info(link, "Interface name change detected, renamed to %s.", ifname);
2335
2336 hashmap_remove(link->manager->links_by_name, link->ifname);
2337
2338 r = free_and_strdup(&link->ifname, ifname);
2339 if (r < 0)
2340 return log_oom_debug();
2341
2342 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, link->ifname, link);
2343 if (r < 0)
2344 return log_link_debug_errno(link, r, "Failed to manage link by its new name: %m");
2345
2346 if (link->dhcp_client) {
2347 r = sd_dhcp_client_set_ifname(link->dhcp_client, link->ifname);
2348 if (r < 0)
2349 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP client: %m");
2350 }
2351
2352 if (link->dhcp6_client) {
2353 r = sd_dhcp6_client_set_ifname(link->dhcp6_client, link->ifname);
2354 if (r < 0)
2355 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP6 client: %m");
2356 }
2357
2358 if (link->ndisc) {
2359 r = sd_ndisc_set_ifname(link->ndisc, link->ifname);
2360 if (r < 0)
2361 return log_link_debug_errno(link, r, "Failed to update interface name in NDisc: %m");
2362 }
2363
2364 if (link->dhcp_server) {
2365 r = sd_dhcp_server_set_ifname(link->dhcp_server, link->ifname);
2366 if (r < 0)
2367 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP server: %m");
2368 }
2369
2370 if (link->radv) {
2371 r = sd_radv_set_ifname(link->radv, link->ifname);
2372 if (r < 0)
2373 return log_link_debug_errno(link, r, "Failed to update interface name in Router Advertisement: %m");
2374 }
2375
2376 if (link->lldp_rx) {
2377 r = sd_lldp_rx_set_ifname(link->lldp_rx, link->ifname);
2378 if (r < 0)
2379 return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Rx: %m");
2380 }
2381
2382 if (link->lldp_tx) {
2383 r = sd_lldp_tx_set_ifname(link->lldp_tx, link->ifname);
2384 if (r < 0)
2385 return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Tx: %m");
2386 }
2387
2388 if (link->ipv4ll) {
2389 r = sd_ipv4ll_set_ifname(link->ipv4ll, link->ifname);
2390 if (r < 0)
2391 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4LL client: %m");
2392 }
2393
2394 r = ipv4acd_set_ifname(link);
2395 if (r < 0)
2396 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4ACD client: %m");
2397
2398 return 1; /* needs reconfigure */
2399 }
2400
2401 static int link_update(Link *link, sd_netlink_message *message) {
2402 bool needs_reconfigure = false;
2403 int r;
2404
2405 assert(link);
2406 assert(message);
2407
2408 r = link_update_name(link, message);
2409 if (r < 0)
2410 return r;
2411 needs_reconfigure = needs_reconfigure || r > 0;
2412
2413 r = link_update_alternative_names(link, message);
2414 if (r < 0)
2415 return r;
2416 needs_reconfigure = needs_reconfigure || r > 0;
2417
2418 r = link_update_mtu(link, message);
2419 if (r < 0)
2420 return r;
2421
2422 r = link_update_driver(link, message);
2423 if (r < 0)
2424 return r;
2425 needs_reconfigure = needs_reconfigure || r > 0;
2426
2427 r = link_update_permanent_hardware_address(link, message);
2428 if (r < 0)
2429 return r;
2430 needs_reconfigure = needs_reconfigure || r > 0;
2431
2432 r = link_update_hardware_address(link, message);
2433 if (r < 0)
2434 return r;
2435 needs_reconfigure = needs_reconfigure || r > 0;
2436
2437 r = link_update_master(link, message);
2438 if (r < 0)
2439 return r;
2440
2441 r = link_update_ipv6ll_addrgen_mode(link, message);
2442 if (r < 0)
2443 return r;
2444
2445 r = link_update_flags(link, message);
2446 if (r < 0)
2447 return r;
2448
2449 r = link_update_bridge_vlan(link, message);
2450 if (r < 0)
2451 return r;
2452
2453 return needs_reconfigure;
2454 }
2455
2456 static Link *link_drop_or_unref(Link *link) {
2457 if (!link)
2458 return NULL;
2459 if (!link->manager)
2460 return link_unref(link);
2461 return link_drop(link);
2462 }
2463
2464 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_drop_or_unref);
2465
2466 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
2467 _cleanup_free_ char *ifname = NULL, *kind = NULL, *state_file = NULL, *lease_file = NULL, *lldp_file = NULL;
2468 _cleanup_(link_drop_or_unrefp) Link *link = NULL;
2469 unsigned short iftype;
2470 int r, ifindex;
2471
2472 assert(manager);
2473 assert(message);
2474 assert(ret);
2475
2476 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2477 if (r < 0)
2478 return log_debug_errno(r, "rtnl: failed to read ifindex from link message: %m");
2479 else if (ifindex <= 0)
2480 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "rtnl: received link message without valid ifindex.");
2481
2482 r = sd_rtnl_message_link_get_type(message, &iftype);
2483 if (r < 0)
2484 return log_debug_errno(r, "rtnl: failed to read interface type from link message: %m");
2485
2486 r = sd_netlink_message_read_string_strdup(message, IFLA_IFNAME, &ifname);
2487 if (r < 0)
2488 return log_debug_errno(r, "rtnl: failed to read interface name from link message: %m");
2489
2490 /* check for link kind */
2491 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
2492 if (r >= 0) {
2493 r = sd_netlink_message_read_string_strdup(message, IFLA_INFO_KIND, &kind);
2494 if (r < 0 && r != -ENODATA)
2495 return log_debug_errno(r, "rtnl: failed to read interface kind from link message: %m");
2496 r = sd_netlink_message_exit_container(message);
2497 if (r < 0)
2498 return log_debug_errno(r, "rtnl: failed to exit IFLA_LINKINFO container: %m");
2499 }
2500
2501 if (!manager->test_mode) {
2502 /* Do not update state files when running in test mode. */
2503 if (asprintf(&state_file, "/run/systemd/netif/links/%d", ifindex) < 0)
2504 return log_oom_debug();
2505
2506 if (asprintf(&lease_file, "/run/systemd/netif/leases/%d", ifindex) < 0)
2507 return log_oom_debug();
2508
2509 if (asprintf(&lldp_file, "/run/systemd/netif/lldp/%d", ifindex) < 0)
2510 return log_oom_debug();
2511 }
2512
2513 link = new(Link, 1);
2514 if (!link)
2515 return -ENOMEM;
2516
2517 *link = (Link) {
2518 .n_ref = 1,
2519 .state = LINK_STATE_PENDING,
2520 .online_state = _LINK_ONLINE_STATE_INVALID,
2521 .ifindex = ifindex,
2522 .iftype = iftype,
2523 .ifname = TAKE_PTR(ifname),
2524 .kind = TAKE_PTR(kind),
2525
2526 .bridge_vlan_pvid = UINT16_MAX,
2527
2528 .ipv6ll_address_gen_mode = _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_INVALID,
2529
2530 .state_file = TAKE_PTR(state_file),
2531 .lease_file = TAKE_PTR(lease_file),
2532 .lldp_file = TAKE_PTR(lldp_file),
2533
2534 .n_dns = UINT_MAX,
2535 .dns_default_route = -1,
2536 .llmnr = _RESOLVE_SUPPORT_INVALID,
2537 .mdns = _RESOLVE_SUPPORT_INVALID,
2538 .dnssec_mode = _DNSSEC_MODE_INVALID,
2539 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
2540 };
2541
2542 r = hashmap_ensure_put(&manager->links_by_index, NULL, INT_TO_PTR(link->ifindex), link);
2543 if (r < 0)
2544 return log_link_debug_errno(link, r, "Failed to store link into manager: %m");
2545
2546 link->manager = manager;
2547
2548 r = hashmap_ensure_put(&manager->links_by_name, &string_hash_ops, link->ifname, link);
2549 if (r < 0)
2550 return log_link_debug_errno(link, r, "Failed to manage link by its interface name: %m");
2551
2552 log_link_debug(link, "Saved new link: ifindex=%i, iftype=%s(%u), kind=%s",
2553 link->ifindex, strna(arphrd_to_name(link->iftype)), link->iftype, strna(link->kind));
2554
2555 /* If contained in this set, the link is wireless and the corresponding NL80211_CMD_NEW_INTERFACE
2556 * message arrived too early. Request the wireless link information again.
2557 */
2558 if (set_remove(manager->new_wlan_ifindices, INT_TO_PTR(link->ifindex))) {
2559 r = link_get_wlan_interface(link);
2560 if (r < 0)
2561 log_link_warning_errno(link, r, "Failed to get wireless interface, ignoring: %m");
2562 }
2563
2564 *ret = TAKE_PTR(link);
2565 return 0;
2566 }
2567
2568 int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, Manager *manager) {
2569 Link *link = NULL;
2570 NetDev *netdev = NULL;
2571 uint16_t type;
2572 const char *name;
2573 int r, ifindex;
2574
2575 assert(rtnl);
2576 assert(message);
2577 assert(manager);
2578
2579 if (sd_netlink_message_is_error(message)) {
2580 r = sd_netlink_message_get_errno(message);
2581 if (r < 0)
2582 log_message_warning_errno(message, r, "rtnl: Could not receive link message, ignoring");
2583
2584 return 0;
2585 }
2586
2587 r = sd_netlink_message_get_type(message, &type);
2588 if (r < 0) {
2589 log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
2590 return 0;
2591 } else if (!IN_SET(type, RTM_NEWLINK, RTM_DELLINK)) {
2592 log_warning("rtnl: Received unexpected message type %u when processing link, ignoring.", type);
2593 return 0;
2594 }
2595
2596 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2597 if (r < 0) {
2598 log_warning_errno(r, "rtnl: Could not get ifindex from link message, ignoring: %m");
2599 return 0;
2600 } else if (ifindex <= 0) {
2601 log_warning("rtnl: received link message with invalid ifindex %d, ignoring.", ifindex);
2602 return 0;
2603 }
2604
2605 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
2606 if (r < 0) {
2607 log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
2608 return 0;
2609 }
2610
2611 (void) link_get_by_index(manager, ifindex, &link);
2612 (void) netdev_get(manager, name, &netdev);
2613
2614 switch (type) {
2615 case RTM_NEWLINK:
2616 if (netdev) {
2617 /* netdev exists, so make sure the ifindex matches */
2618 r = netdev_set_ifindex(netdev, message);
2619 if (r < 0) {
2620 log_netdev_warning_errno(netdev, r, "Could not process new link message for netdev, ignoring: %m");
2621 return 0;
2622 }
2623 }
2624
2625 if (!link) {
2626 /* link is new, so add it */
2627 r = link_new(manager, message, &link);
2628 if (r < 0) {
2629 log_warning_errno(r, "Could not process new link message: %m");
2630 return 0;
2631 }
2632
2633 r = link_update(link, message);
2634 if (r < 0) {
2635 log_link_warning_errno(link, r, "Could not process link message: %m");
2636 link_enter_failed(link);
2637 return 0;
2638 }
2639
2640 r = link_check_initialized(link);
2641 if (r < 0) {
2642 log_link_warning_errno(link, r, "Failed to check link is initialized: %m");
2643 link_enter_failed(link);
2644 return 0;
2645 }
2646 } else {
2647 r = link_update(link, message);
2648 if (r < 0) {
2649 log_link_warning_errno(link, r, "Could not process link message: %m");
2650 link_enter_failed(link);
2651 return 0;
2652 }
2653 if (r > 0) {
2654 r = link_reconfigure_impl(link, /* force = */ false);
2655 if (r < 0) {
2656 log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
2657 link_enter_failed(link);
2658 return 0;
2659 }
2660 }
2661 }
2662 break;
2663
2664 case RTM_DELLINK:
2665 link_drop(link);
2666 netdev_drop(netdev);
2667 break;
2668
2669 default:
2670 assert_not_reached();
2671 }
2672
2673 return 1;
2674 }
2675
2676 int link_getlink_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, const char *error_msg) {
2677 uint16_t message_type;
2678 int r;
2679
2680 assert(m);
2681 assert(link);
2682 assert(error_msg);
2683
2684 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2685 return 0;
2686
2687 r = sd_netlink_message_get_errno(m);
2688 if (r < 0) {
2689 log_link_message_warning_errno(link, m, r, error_msg);
2690 link_enter_failed(link);
2691 return 0;
2692 }
2693
2694 r = sd_netlink_message_get_type(m, &message_type);
2695 if (r < 0) {
2696 log_link_debug_errno(link, r, "rtnl: failed to read link message type, ignoring: %m");
2697 return 0;
2698 }
2699 if (message_type != RTM_NEWLINK) {
2700 log_link_debug(link, "rtnl: received invalid link message type, ignoring.");
2701 return 0;
2702 }
2703
2704 r = link_update(link, m);
2705 if (r < 0) {
2706 link_enter_failed(link);
2707 return 0;
2708 }
2709
2710 return 1;
2711 }
2712
2713 int link_call_getlink(Link *link, link_netlink_message_handler_t callback) {
2714 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2715 int r;
2716
2717 assert(link);
2718 assert(link->manager);
2719 assert(link->manager->rtnl);
2720 assert(callback);
2721
2722 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
2723 if (r < 0)
2724 return r;
2725
2726 r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
2727 link_netlink_destroy_callback, link);
2728 if (r < 0)
2729 return r;
2730
2731 link_ref(link);
2732 return 0;
2733 }
2734
2735 static const char* const link_state_table[_LINK_STATE_MAX] = {
2736 [LINK_STATE_PENDING] = "pending",
2737 [LINK_STATE_INITIALIZED] = "initialized",
2738 [LINK_STATE_CONFIGURING] = "configuring",
2739 [LINK_STATE_CONFIGURED] = "configured",
2740 [LINK_STATE_UNMANAGED] = "unmanaged",
2741 [LINK_STATE_FAILED] = "failed",
2742 [LINK_STATE_LINGER] = "linger",
2743 };
2744
2745 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
2746
2747 int link_flags_to_string_alloc(uint32_t flags, char **ret) {
2748 _cleanup_free_ char *str = NULL;
2749 static const char* map[] = {
2750 [LOG2U(IFF_UP)] = "up", /* interface is up. */
2751 [LOG2U(IFF_BROADCAST)] = "broadcast", /* broadcast address valid. */
2752 [LOG2U(IFF_DEBUG)] = "debug", /* turn on debugging. */
2753 [LOG2U(IFF_LOOPBACK)] = "loopback", /* interface is a loopback net. */
2754 [LOG2U(IFF_POINTOPOINT)] = "point-to-point", /* interface has p-p link. */
2755 [LOG2U(IFF_NOTRAILERS)] = "no-trailers", /* avoid use of trailers. */
2756 [LOG2U(IFF_RUNNING)] = "running", /* interface RFC2863 OPER_UP. */
2757 [LOG2U(IFF_NOARP)] = "no-arp", /* no ARP protocol. */
2758 [LOG2U(IFF_PROMISC)] = "promiscuous", /* receive all packets. */
2759 [LOG2U(IFF_ALLMULTI)] = "all-multicast", /* receive all multicast packets. */
2760 [LOG2U(IFF_MASTER)] = "master", /* master of a load balancer. */
2761 [LOG2U(IFF_SLAVE)] = "slave", /* slave of a load balancer. */
2762 [LOG2U(IFF_MULTICAST)] = "multicast", /* supports multicast. */
2763 [LOG2U(IFF_PORTSEL)] = "portsel", /* can set media type. */
2764 [LOG2U(IFF_AUTOMEDIA)] = "auto-media", /* auto media select active. */
2765 [LOG2U(IFF_DYNAMIC)] = "dynamic", /* dialup device with changing addresses. */
2766 [LOG2U(IFF_LOWER_UP)] = "lower-up", /* driver signals L1 up. */
2767 [LOG2U(IFF_DORMANT)] = "dormant", /* driver signals dormant. */
2768 [LOG2U(IFF_ECHO)] = "echo", /* echo sent packets. */
2769 };
2770
2771 assert(ret);
2772
2773 for (size_t i = 0; i < ELEMENTSOF(map); i++)
2774 if (FLAGS_SET(flags, 1 << i) && map[i])
2775 if (!strextend_with_separator(&str, ",", map[i]))
2776 return -ENOMEM;
2777
2778 *ret = TAKE_PTR(str);
2779 return 0;
2780 }
2781
2782 static const char * const kernel_operstate_table[] = {
2783 [IF_OPER_UNKNOWN] = "unknown",
2784 [IF_OPER_NOTPRESENT] = "not-present",
2785 [IF_OPER_DOWN] = "down",
2786 [IF_OPER_LOWERLAYERDOWN] = "lower-layer-down",
2787 [IF_OPER_TESTING] = "testing",
2788 [IF_OPER_DORMANT] = "dormant",
2789 [IF_OPER_UP] = "up",
2790 };
2791
2792 DEFINE_STRING_TABLE_LOOKUP_TO_STRING(kernel_operstate, int);
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