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Merge pull request #30716 from yuwata/network-cancel-request
[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 int link_drop_requests(Link *link) {
935 Request *req;
936 int ret = 0;
937
938 assert(link);
939 assert(link->manager);
940
941 ORDERED_SET_FOREACH(req, link->manager->request_queue) {
942 if (req->link != link)
943 continue;
944
945 /* If the request is already called, but its reply is not received, then we need to
946 * drop the configuration (e.g. address) here. Note, if the configuration is known,
947 * it will be handled later by link_drop_foreign_addresses() or so. */
948 if (req->waiting_reply && link->state != LINK_STATE_LINGER)
949 switch (req->type) {
950 case REQUEST_TYPE_ADDRESS: {
951 Address *address = ASSERT_PTR(req->userdata);
952
953 if (address_get(link, address, NULL) < 0)
954 RET_GATHER(ret, address_remove(address, link));
955 break;
956 }
957 case REQUEST_TYPE_NEIGHBOR: {
958 Neighbor *neighbor = ASSERT_PTR(req->userdata);
959
960 if (neighbor_get(link, neighbor, NULL) < 0)
961 RET_GATHER(ret, neighbor_remove(neighbor, link));
962 break;
963 }
964 case REQUEST_TYPE_NEXTHOP: {
965 NextHop *nexthop = ASSERT_PTR(req->userdata);
966
967 if (nexthop_get_by_id(link->manager, nexthop->id, NULL) < 0)
968 RET_GATHER(ret, nexthop_remove(nexthop, link->manager));
969 break;
970 }
971 default:
972 ;
973 }
974
975 request_detach(link->manager, req);
976 }
977
978 return ret;
979 }
980
981 static Link *link_drop(Link *link) {
982 if (!link)
983 return NULL;
984
985 assert(link->manager);
986
987 link_set_state(link, LINK_STATE_LINGER);
988
989 /* Drop all references from other links and manager. Note that async netlink calls may have
990 * references to the link, and they will be dropped when we receive replies. */
991
992 (void) link_drop_requests(link);
993
994 link_free_bound_to_list(link);
995 link_free_bound_by_list(link);
996
997 link_clear_sr_iov_ifindices(link);
998
999 link_drop_from_master(link);
1000
1001 if (link->state_file)
1002 (void) unlink(link->state_file);
1003
1004 link_clean(link);
1005
1006 STRV_FOREACH(n, link->alternative_names)
1007 hashmap_remove(link->manager->links_by_name, *n);
1008 hashmap_remove(link->manager->links_by_name, link->ifname);
1009
1010 /* bonding master and its slaves have the same hardware address. */
1011 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
1012
1013 /* The following must be called at last. */
1014 assert_se(hashmap_remove(link->manager->links_by_index, INT_TO_PTR(link->ifindex)) == link);
1015 return link_unref(link);
1016 }
1017
1018 static int link_drop_foreign_config(Link *link) {
1019 int r;
1020
1021 assert(link);
1022 assert(link->manager);
1023
1024 /* Drop foreign config, but ignore unmanaged, loopback, or critical interfaces. We do not want
1025 * to remove loopback address or addresses used for root NFS. */
1026
1027 if (IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
1028 return 0;
1029 if (FLAGS_SET(link->flags, IFF_LOOPBACK))
1030 return 0;
1031 if (link->network->keep_configuration == KEEP_CONFIGURATION_YES)
1032 return 0;
1033
1034 r = link_drop_foreign_routes(link);
1035
1036 RET_GATHER(r, link_drop_foreign_nexthops(link));
1037 RET_GATHER(r, link_drop_foreign_addresses(link));
1038 RET_GATHER(r, link_drop_foreign_neighbors(link));
1039 RET_GATHER(r, manager_drop_foreign_routing_policy_rules(link->manager));
1040
1041 return r;
1042 }
1043
1044 static int link_drop_managed_config(Link *link) {
1045 int r;
1046
1047 assert(link);
1048 assert(link->manager);
1049
1050 r = link_drop_managed_routes(link);
1051
1052 RET_GATHER(r, link_drop_managed_nexthops(link));
1053 RET_GATHER(r, link_drop_managed_addresses(link));
1054 RET_GATHER(r, link_drop_managed_neighbors(link));
1055 RET_GATHER(r, link_drop_managed_routing_policy_rules(link));
1056
1057 return r;
1058 }
1059
1060 static void link_foreignize_config(Link *link) {
1061 assert(link);
1062 assert(link->manager);
1063
1064 link_foreignize_routes(link);
1065 link_foreignize_nexthops(link);
1066 link_foreignize_addresses(link);
1067 link_foreignize_neighbors(link);
1068 link_foreignize_routing_policy_rules(link);
1069 }
1070
1071 static int link_configure(Link *link) {
1072 int r;
1073
1074 assert(link);
1075 assert(link->network);
1076 assert(link->state == LINK_STATE_INITIALIZED);
1077
1078 link_set_state(link, LINK_STATE_CONFIGURING);
1079
1080 r = link_new_bound_to_list(link);
1081 if (r < 0)
1082 return r;
1083
1084 r = link_request_traffic_control(link);
1085 if (r < 0)
1086 return r;
1087
1088 r = link_configure_mtu(link);
1089 if (r < 0)
1090 return r;
1091
1092 if (link->iftype == ARPHRD_CAN) {
1093 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1094 r = link_request_to_set_can(link);
1095 if (r < 0)
1096 return r;
1097
1098 return link_request_to_activate(link);
1099 }
1100
1101 r = link_request_sr_iov_vfs(link);
1102 if (r < 0)
1103 return r;
1104
1105 r = link_set_sysctl(link);
1106 if (r < 0)
1107 return r;
1108
1109 r = link_request_to_set_mac(link, /* allow_retry = */ true);
1110 if (r < 0)
1111 return r;
1112
1113 r = link_request_to_set_ipoib(link);
1114 if (r < 0)
1115 return r;
1116
1117 r = link_request_to_set_flags(link);
1118 if (r < 0)
1119 return r;
1120
1121 r = link_request_to_set_group(link);
1122 if (r < 0)
1123 return r;
1124
1125 r = link_request_to_set_addrgen_mode(link);
1126 if (r < 0)
1127 return r;
1128
1129 r = link_request_to_set_master(link);
1130 if (r < 0)
1131 return r;
1132
1133 r = link_request_stacked_netdevs(link);
1134 if (r < 0)
1135 return r;
1136
1137 r = link_request_to_set_bond(link);
1138 if (r < 0)
1139 return r;
1140
1141 r = link_request_to_set_bridge(link);
1142 if (r < 0)
1143 return r;
1144
1145 r = link_request_to_set_bridge_vlan(link);
1146 if (r < 0)
1147 return r;
1148
1149 r = link_request_to_activate(link);
1150 if (r < 0)
1151 return r;
1152
1153 r = ipv4ll_configure(link);
1154 if (r < 0)
1155 return r;
1156
1157 r = link_request_dhcp4_client(link);
1158 if (r < 0)
1159 return r;
1160
1161 r = link_request_dhcp6_client(link);
1162 if (r < 0)
1163 return r;
1164
1165 r = link_request_ndisc(link);
1166 if (r < 0)
1167 return r;
1168
1169 r = link_request_dhcp_server(link);
1170 if (r < 0)
1171 return r;
1172
1173 r = link_request_radv(link);
1174 if (r < 0)
1175 return r;
1176
1177 r = link_lldp_rx_configure(link);
1178 if (r < 0)
1179 return r;
1180
1181 r = link_lldp_tx_configure(link);
1182 if (r < 0)
1183 return r;
1184
1185 r = link_drop_foreign_config(link);
1186 if (r < 0)
1187 return r;
1188
1189 r = link_request_static_configs(link);
1190 if (r < 0)
1191 return r;
1192
1193 if (!link_has_carrier(link))
1194 return 0;
1195
1196 return link_acquire_dynamic_conf(link);
1197 }
1198
1199 static int link_get_network(Link *link, Network **ret) {
1200 Network *network;
1201 int r;
1202
1203 assert(link);
1204 assert(link->manager);
1205 assert(ret);
1206
1207 ORDERED_HASHMAP_FOREACH(network, link->manager->networks) {
1208 bool warn = false;
1209
1210 r = net_match_config(
1211 &network->match,
1212 link->dev,
1213 &link->hw_addr,
1214 &link->permanent_hw_addr,
1215 link->driver,
1216 link->iftype,
1217 link->kind,
1218 link->ifname,
1219 link->alternative_names,
1220 link->wlan_iftype,
1221 link->ssid,
1222 &link->bssid);
1223 if (r < 0)
1224 return r;
1225 if (r == 0)
1226 continue;
1227
1228 if (network->match.ifname && link->dev) {
1229 uint8_t name_assign_type = NET_NAME_UNKNOWN;
1230 const char *attr;
1231
1232 if (sd_device_get_sysattr_value(link->dev, "name_assign_type", &attr) >= 0)
1233 (void) safe_atou8(attr, &name_assign_type);
1234
1235 warn = name_assign_type == NET_NAME_ENUM;
1236 }
1237
1238 log_link_full(link, warn ? LOG_WARNING : LOG_DEBUG,
1239 "found matching network '%s'%s.",
1240 network->filename,
1241 warn ? ", based on potentially unpredictable interface name" : "");
1242
1243 if (network->unmanaged)
1244 return -ENOENT;
1245
1246 *ret = network;
1247 return 0;
1248 }
1249
1250 return -ENOENT;
1251 }
1252
1253 int link_reconfigure_impl(Link *link, bool force) {
1254 Network *network = NULL;
1255 NetDev *netdev = NULL;
1256 int r;
1257
1258 assert(link);
1259
1260 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
1261 return 0;
1262
1263 r = netdev_get(link->manager, link->ifname, &netdev);
1264 if (r < 0 && r != -ENOENT)
1265 return r;
1266
1267 r = link_get_network(link, &network);
1268 if (r < 0 && r != -ENOENT)
1269 return r;
1270
1271 if (link->state != LINK_STATE_UNMANAGED && !network)
1272 /* If link is in initialized state, then link->network is also NULL. */
1273 force = true;
1274
1275 if (link->network == network && !force)
1276 return 0;
1277
1278 if (network) {
1279 _cleanup_free_ char *joined = strv_join(network->dropins, ", ");
1280
1281 if (link->state == LINK_STATE_INITIALIZED)
1282 log_link_info(link, "Configuring with %s%s%s%s.",
1283 network->filename,
1284 isempty(joined) ? "" : " (dropins: ",
1285 joined,
1286 isempty(joined) ? "" : ")");
1287 else
1288 log_link_info(link, "Reconfiguring with %s%s%s%s.",
1289 network->filename,
1290 isempty(joined) ? "" : " (dropins: ",
1291 joined,
1292 isempty(joined) ? "" : ")");
1293 } else
1294 log_link_full(link, link->state == LINK_STATE_INITIALIZED ? LOG_DEBUG : LOG_INFO,
1295 "Unmanaging interface.");
1296
1297 /* Dropping old .network file */
1298 r = link_stop_engines(link, false);
1299 if (r < 0)
1300 return r;
1301
1302 r = link_drop_requests(link);
1303 if (r < 0)
1304 return r;
1305
1306 if (network && !force && network->keep_configuration != KEEP_CONFIGURATION_YES)
1307 /* When a new/updated .network file is assigned, first make all configs (addresses,
1308 * routes, and so on) foreign, and then drop unnecessary configs later by
1309 * link_drop_foreign_config() in link_configure().
1310 * Note, when KeepConfiguration=yes, link_drop_foreign_config() does nothing. Hence,
1311 * here we need to drop the configs such as addresses, routes, and so on configured by
1312 * the previously assigned .network file. */
1313 link_foreignize_config(link);
1314 else {
1315 /* Remove all managed configs. Note, foreign configs are removed in later by
1316 * link_configure() -> link_drop_foreign_config() if the link is managed by us. */
1317 r = link_drop_managed_config(link);
1318 if (r < 0)
1319 return r;
1320 }
1321
1322 /* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the
1323 * bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will
1324 * not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the
1325 * map here, as it depends on .network files assigned to other links. */
1326 link_free_bound_to_list(link);
1327
1328 link_free_engines(link);
1329 link->network = network_unref(link->network);
1330
1331 netdev_unref(link->netdev);
1332 link->netdev = netdev_ref(netdev);
1333
1334 if (!network) {
1335 link_set_state(link, LINK_STATE_UNMANAGED);
1336 return 0;
1337 }
1338
1339 /* Then, apply new .network file */
1340 link->network = network_ref(network);
1341 link_update_operstate(link, true);
1342 link_dirty(link);
1343
1344 link_set_state(link, LINK_STATE_INITIALIZED);
1345 link->activated = false;
1346
1347 r = link_configure(link);
1348 if (r < 0)
1349 return r;
1350
1351 return 1;
1352 }
1353
1354 static int link_reconfigure_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, bool force) {
1355 int r;
1356
1357 assert(link);
1358
1359 r = link_getlink_handler_internal(rtnl, m, link, "Failed to update link state");
1360 if (r <= 0)
1361 return r;
1362
1363 r = link_reconfigure_impl(link, force);
1364 if (r < 0) {
1365 link_enter_failed(link);
1366 return 0;
1367 }
1368
1369 return r;
1370 }
1371
1372 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1373 return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ false);
1374 }
1375
1376 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1377 return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ true);
1378 }
1379
1380 int link_reconfigure(Link *link, bool force) {
1381 int r;
1382
1383 assert(link);
1384
1385 /* When link in pending or initialized state, then link_configure() will be called. To prevent
1386 * the function from being called multiple times simultaneously, refuse to reconfigure the
1387 * interface in these cases. */
1388 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
1389 return 0; /* 0 means no-op. */
1390
1391 r = link_call_getlink(link, force ? link_force_reconfigure_handler : link_reconfigure_handler);
1392 if (r < 0)
1393 return r;
1394
1395 return 1; /* 1 means the interface will be reconfigured. */
1396 }
1397
1398 static int link_initialized_and_synced(Link *link) {
1399 int r;
1400
1401 assert(link);
1402 assert(link->manager);
1403
1404 if (link->manager->test_mode) {
1405 log_link_debug(link, "Running in test mode, refusing to enter initialized state.");
1406 link_set_state(link, LINK_STATE_UNMANAGED);
1407 return 0;
1408 }
1409
1410 if (link->state == LINK_STATE_PENDING) {
1411 log_link_debug(link, "Link state is up-to-date");
1412 link_set_state(link, LINK_STATE_INITIALIZED);
1413
1414 r = link_new_bound_by_list(link);
1415 if (r < 0)
1416 return r;
1417
1418 r = link_handle_bound_by_list(link);
1419 if (r < 0)
1420 return r;
1421 }
1422
1423 return link_reconfigure_impl(link, /* force = */ false);
1424 }
1425
1426 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1427 int r;
1428
1429 r = link_getlink_handler_internal(rtnl, m, link, "Failed to wait for the interface to be initialized");
1430 if (r <= 0)
1431 return r;
1432
1433 r = link_initialized_and_synced(link);
1434 if (r < 0)
1435 link_enter_failed(link);
1436
1437 return 0;
1438 }
1439
1440 static int link_initialized(Link *link, sd_device *device) {
1441 int r;
1442
1443 assert(link);
1444 assert(device);
1445
1446 /* Always replace with the new sd_device object. As the sysname (and possibly other properties
1447 * or sysattrs) may be outdated. */
1448 device_unref_and_replace(link->dev, device);
1449
1450 if (link->dhcp_client) {
1451 r = sd_dhcp_client_attach_device(link->dhcp_client, link->dev);
1452 if (r < 0)
1453 log_link_warning_errno(link, r, "Failed to attach device to DHCPv4 client, ignoring: %m");
1454 }
1455
1456 if (link->dhcp6_client) {
1457 r = sd_dhcp6_client_attach_device(link->dhcp6_client, link->dev);
1458 if (r < 0)
1459 log_link_warning_errno(link, r, "Failed to attach device to DHCPv6 client, ignoring: %m");
1460 }
1461
1462 r = link_set_sr_iov_ifindices(link);
1463 if (r < 0)
1464 log_link_warning_errno(link, r, "Failed to manage SR-IOV PF and VF ports, ignoring: %m");
1465
1466 if (link->state != LINK_STATE_PENDING)
1467 return link_reconfigure(link, /* force = */ false);
1468
1469 log_link_debug(link, "udev initialized link");
1470
1471 /* udev has initialized the link, but we don't know if we have yet
1472 * processed the NEWLINK messages with the latest state. Do a GETLINK,
1473 * when it returns we know that the pending NEWLINKs have already been
1474 * processed and that we are up-to-date */
1475
1476 return link_call_getlink(link, link_initialized_handler);
1477 }
1478
1479 static int link_check_initialized(Link *link) {
1480 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
1481 int r;
1482
1483 assert(link);
1484
1485 if (!udev_available())
1486 return link_initialized_and_synced(link);
1487
1488 /* udev should be around */
1489 r = sd_device_new_from_ifindex(&device, link->ifindex);
1490 if (r < 0) {
1491 log_link_debug_errno(link, r, "Could not find device, waiting for device initialization: %m");
1492 return 0;
1493 }
1494
1495 r = sd_device_get_is_initialized(device);
1496 if (r < 0)
1497 return log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
1498 if (r == 0) {
1499 /* not yet ready */
1500 log_link_debug(link, "link pending udev initialization...");
1501 return 0;
1502 }
1503
1504 r = device_is_renaming(device);
1505 if (r < 0)
1506 return log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
1507 if (r > 0) {
1508 log_link_debug(link, "Interface is being renamed, pending initialization.");
1509 return 0;
1510 }
1511
1512 return link_initialized(link, device);
1513 }
1514
1515 int manager_udev_process_link(Manager *m, sd_device *device, sd_device_action_t action) {
1516 int r, ifindex;
1517 const char *s;
1518 Link *link;
1519
1520 assert(m);
1521 assert(device);
1522
1523 r = sd_device_get_ifindex(device, &ifindex);
1524 if (r < 0)
1525 return log_device_debug_errno(device, r, "Failed to get ifindex: %m");
1526
1527 r = link_get_by_index(m, ifindex, &link);
1528 if (r < 0) {
1529 /* This error is not critical, as the corresponding rtnl message may be received later. */
1530 log_device_debug_errno(device, r, "Failed to get link from ifindex %i, ignoring: %m", ifindex);
1531 return 0;
1532 }
1533
1534 /* Let's unref the sd-device object assigned to the corresponding Link object, but keep the Link
1535 * object here. It will be removed only when rtnetlink says so. */
1536 if (action == SD_DEVICE_REMOVE) {
1537 link->dev = sd_device_unref(link->dev);
1538 return 0;
1539 }
1540
1541 r = device_is_renaming(device);
1542 if (r < 0)
1543 return log_device_debug_errno(device, r, "Failed to determine if the device is renaming or not: %m");
1544 if (r > 0) {
1545 log_device_debug(device, "Device is renaming, waiting for the interface to be renamed.");
1546 /* TODO:
1547 * What happens when a device is initialized, then soon renamed after that? When we detect
1548 * such, maybe we should cancel or postpone all queued requests for the interface. */
1549 return 0;
1550 }
1551
1552 r = sd_device_get_property_value(device, "ID_NET_MANAGED_BY", &s);
1553 if (r < 0 && r != -ENOENT)
1554 log_device_debug_errno(device, r, "Failed to get ID_NET_MANAGED_BY udev property, ignoring: %m");
1555 if (r >= 0 && !streq(s, "io.systemd.Network")) {
1556 log_device_debug(device, "Interface is requested to be managed by '%s', not managing the interface.", s);
1557 link_set_state(link, LINK_STATE_UNMANAGED);
1558 return 0;
1559 }
1560
1561 r = link_initialized(link, device);
1562 if (r < 0)
1563 link_enter_failed(link);
1564
1565 return 0;
1566 }
1567
1568 static int link_carrier_gained(Link *link) {
1569 bool force_reconfigure;
1570 int r;
1571
1572 assert(link);
1573
1574 r = event_source_disable(link->carrier_lost_timer);
1575 if (r < 0)
1576 log_link_warning_errno(link, r, "Failed to disable carrier lost timer, ignoring: %m");
1577
1578 /* If a wireless interface was connected to an access point, and the SSID is changed (that is,
1579 * both previous_ssid and ssid are non-NULL), then the connected wireless network could be
1580 * changed. So, always reconfigure the link. Which means e.g. the DHCP client will be
1581 * restarted, and the correct network information will be gained.
1582 *
1583 * However, do not reconfigure the wireless interface forcibly if it was not connected to any
1584 * access points previously (previous_ssid is NULL in this case). As, a .network file may be
1585 * already assigned to the interface (in that case, the .network file does not have the SSID=
1586 * setting in the [Match] section), and the interface is already being configured. Of course,
1587 * there may exist another .network file with higher priority and a matching SSID= setting. But
1588 * in that case, link_reconfigure_impl() can handle that without the force_reconfigure flag.
1589 *
1590 * For non-wireless interfaces, we have no way to detect the connected network change. So,
1591 * setting force_reconfigure = false. Note, both ssid and previous_ssid are NULL in that case. */
1592 force_reconfigure = link->previous_ssid && !streq_ptr(link->previous_ssid, link->ssid);
1593 link->previous_ssid = mfree(link->previous_ssid);
1594
1595 /* AP and P2P-GO interfaces may have a new SSID - update the link properties in case a new .network
1596 * profile wants to match on it with SSID= in its [Match] section.
1597 */
1598 if (IN_SET(link->wlan_iftype, NL80211_IFTYPE_AP, NL80211_IFTYPE_P2P_GO)) {
1599 r = link_get_wlan_interface(link);
1600 if (r < 0)
1601 return r;
1602 }
1603
1604 /* At this stage, both wlan and link information should be up-to-date. Hence, it is not necessary to
1605 * call RTM_GETLINK, NL80211_CMD_GET_INTERFACE, or NL80211_CMD_GET_STATION commands, and simply call
1606 * link_reconfigure_impl(). Note, link_reconfigure_impl() returns 1 when the link is reconfigured. */
1607 r = link_reconfigure_impl(link, force_reconfigure);
1608 if (r != 0)
1609 return r;
1610
1611 r = link_handle_bound_by_list(link);
1612 if (r < 0)
1613 return r;
1614
1615 if (link->iftype == ARPHRD_CAN)
1616 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1617 return 0;
1618
1619 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
1620 r = link_acquire_dynamic_conf(link);
1621 if (r < 0)
1622 return r;
1623
1624 r = link_request_static_configs(link);
1625 if (r < 0)
1626 return r;
1627 }
1628
1629 return 0;
1630 }
1631
1632 static int link_carrier_lost_impl(Link *link) {
1633 int r, ret = 0;
1634
1635 assert(link);
1636
1637 link->previous_ssid = mfree(link->previous_ssid);
1638
1639 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1640 return 0;
1641
1642 if (!link->network)
1643 return 0;
1644
1645 r = link_stop_engines(link, false);
1646 if (r < 0)
1647 ret = r;
1648
1649 r = link_drop_managed_config(link);
1650 if (r < 0 && ret >= 0)
1651 ret = r;
1652
1653 return ret;
1654 }
1655
1656 static int link_carrier_lost_handler(sd_event_source *s, uint64_t usec, void *userdata) {
1657 Link *link = ASSERT_PTR(userdata);
1658 int r;
1659
1660 r = link_carrier_lost_impl(link);
1661 if (r < 0) {
1662 log_link_warning_errno(link, r, "Failed to process carrier lost event: %m");
1663 link_enter_failed(link);
1664 }
1665
1666 return 0;
1667 }
1668
1669 static int link_carrier_lost(Link *link) {
1670 uint16_t dhcp_mtu;
1671 usec_t usec;
1672 int r;
1673
1674 assert(link);
1675
1676 r = link_handle_bound_by_list(link);
1677 if (r < 0)
1678 return r;
1679
1680 if (link->iftype == ARPHRD_CAN)
1681 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1682 return 0;
1683
1684 if (!link->network)
1685 return 0;
1686
1687 if (link->network->ignore_carrier_loss_set)
1688 /* If IgnoreCarrierLoss= is explicitly specified, then use the specified value. */
1689 usec = link->network->ignore_carrier_loss_usec;
1690
1691 else if (link->network->bond && link->wlan_iftype > 0)
1692 /* Enslaving wlan interface to a bond disconnects from the connected AP, and causes its
1693 * carrier to be lost. See #19832. */
1694 usec = 3 * USEC_PER_SEC;
1695
1696 else if (link->network->dhcp_use_mtu &&
1697 link->dhcp_lease &&
1698 sd_dhcp_lease_get_mtu(link->dhcp_lease, &dhcp_mtu) >= 0 &&
1699 dhcp_mtu != link->original_mtu)
1700 /* Some drivers reset interfaces when changing MTU. Resetting interfaces by the static
1701 * MTU should not cause any issues, as MTU is changed only once. However, setting MTU
1702 * through DHCP lease causes an infinite loop of resetting the interface. See #18738. */
1703 usec = 5 * USEC_PER_SEC;
1704
1705 else
1706 /* Otherwise, use the implied default value. */
1707 usec = link->network->ignore_carrier_loss_usec;
1708
1709 if (usec == USEC_INFINITY)
1710 return 0;
1711
1712 if (usec == 0)
1713 return link_carrier_lost_impl(link);
1714
1715 return event_reset_time_relative(link->manager->event,
1716 &link->carrier_lost_timer,
1717 CLOCK_BOOTTIME,
1718 usec,
1719 0,
1720 link_carrier_lost_handler,
1721 link,
1722 0,
1723 "link-carrier-loss",
1724 true);
1725 }
1726
1727 static int link_admin_state_up(Link *link) {
1728 int r;
1729
1730 assert(link);
1731
1732 /* This is called every time an interface admin state changes to up;
1733 * specifically, when IFF_UP flag changes from unset to set. */
1734
1735 if (!link->network)
1736 return 0;
1737
1738 if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_DOWN) {
1739 log_link_info(link, "Activation policy is \"always-down\", forcing link down.");
1740 return link_request_to_bring_up_or_down(link, /* up = */ false);
1741 }
1742
1743 /* We set the ipv6 mtu after the device mtu, but the kernel resets
1744 * ipv6 mtu on NETDEV_UP, so we need to reset it. */
1745 r = link_set_ipv6_mtu(link);
1746 if (r < 0)
1747 log_link_warning_errno(link, r, "Cannot set IPv6 MTU, ignoring: %m");
1748
1749 return 0;
1750 }
1751
1752 static int link_admin_state_down(Link *link) {
1753 assert(link);
1754
1755 if (!link->network)
1756 return 0;
1757
1758 if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) {
1759 log_link_info(link, "Activation policy is \"always-up\", forcing link up.");
1760 return link_request_to_bring_up_or_down(link, /* up = */ true);
1761 }
1762
1763 return 0;
1764 }
1765
1766 static bool link_is_enslaved(Link *link) {
1767 if (link->flags & IFF_SLAVE)
1768 return true;
1769
1770 if (link->master_ifindex > 0)
1771 return true;
1772
1773 return false;
1774 }
1775
1776 void link_update_operstate(Link *link, bool also_update_master) {
1777 LinkOperationalState operstate;
1778 LinkCarrierState carrier_state;
1779 LinkAddressState ipv4_address_state, ipv6_address_state, address_state;
1780 LinkOnlineState online_state;
1781 _cleanup_strv_free_ char **p = NULL;
1782 bool changed = false;
1783
1784 assert(link);
1785
1786 if (link->kernel_operstate == IF_OPER_DORMANT)
1787 carrier_state = LINK_CARRIER_STATE_DORMANT;
1788 else if (link_has_carrier(link)) {
1789 if (link_is_enslaved(link))
1790 carrier_state = LINK_CARRIER_STATE_ENSLAVED;
1791 else
1792 carrier_state = LINK_CARRIER_STATE_CARRIER;
1793 } else if (link->flags & IFF_UP)
1794 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
1795 else
1796 carrier_state = LINK_CARRIER_STATE_OFF;
1797
1798 if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
1799 Link *slave;
1800
1801 SET_FOREACH(slave, link->slaves) {
1802 link_update_operstate(slave, false);
1803
1804 if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
1805 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
1806 }
1807 }
1808
1809 link_get_address_states(link, &ipv4_address_state, &ipv6_address_state, &address_state);
1810
1811 /* Mapping of address and carrier state vs operational state
1812 * carrier state
1813 * | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
1814 * ------------------------------------------------------------------------------
1815 * off | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
1816 * address_state degraded | off | no-carrier | dormant | degraded | degraded | enslaved
1817 * routable | off | no-carrier | dormant | routable | routable | routable
1818 */
1819
1820 if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_ROUTABLE)
1821 operstate = LINK_OPERSTATE_ROUTABLE;
1822 else if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_DEGRADED)
1823 operstate = LINK_OPERSTATE_DEGRADED;
1824 else if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
1825 operstate = (LinkOperationalState) carrier_state;
1826 else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
1827 operstate = LINK_OPERSTATE_ROUTABLE;
1828 else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
1829 operstate = LINK_OPERSTATE_DEGRADED;
1830 else
1831 operstate = LINK_OPERSTATE_ENSLAVED;
1832
1833 /* Only determine online state for managed links with RequiredForOnline=yes */
1834 if (!link->network || !link->network->required_for_online)
1835 online_state = _LINK_ONLINE_STATE_INVALID;
1836 else if (operstate < link->network->required_operstate_for_online.min ||
1837 operstate > link->network->required_operstate_for_online.max)
1838 online_state = LINK_ONLINE_STATE_OFFLINE;
1839 else {
1840 AddressFamily required_family = link->network->required_family_for_online;
1841 bool needs_ipv4 = required_family & ADDRESS_FAMILY_IPV4;
1842 bool needs_ipv6 = required_family & ADDRESS_FAMILY_IPV6;
1843
1844 /* The operational state is within the range required for online.
1845 * If a particular address family is also required, we might revert
1846 * to offline in the blocks below. */
1847 online_state = LINK_ONLINE_STATE_ONLINE;
1848
1849 if (link->network->required_operstate_for_online.min >= LINK_OPERSTATE_DEGRADED) {
1850 if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_DEGRADED)
1851 online_state = LINK_ONLINE_STATE_OFFLINE;
1852 if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_DEGRADED)
1853 online_state = LINK_ONLINE_STATE_OFFLINE;
1854 }
1855
1856 if (link->network->required_operstate_for_online.min >= LINK_OPERSTATE_ROUTABLE) {
1857 if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1858 online_state = LINK_ONLINE_STATE_OFFLINE;
1859 if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1860 online_state = LINK_ONLINE_STATE_OFFLINE;
1861 }
1862 }
1863
1864 if (link->carrier_state != carrier_state) {
1865 link->carrier_state = carrier_state;
1866 changed = true;
1867 if (strv_extend(&p, "CarrierState") < 0)
1868 log_oom();
1869 }
1870
1871 if (link->address_state != address_state) {
1872 link->address_state = address_state;
1873 changed = true;
1874 if (strv_extend(&p, "AddressState") < 0)
1875 log_oom();
1876 }
1877
1878 if (link->ipv4_address_state != ipv4_address_state) {
1879 link->ipv4_address_state = ipv4_address_state;
1880 changed = true;
1881 if (strv_extend(&p, "IPv4AddressState") < 0)
1882 log_oom();
1883 }
1884
1885 if (link->ipv6_address_state != ipv6_address_state) {
1886 link->ipv6_address_state = ipv6_address_state;
1887 changed = true;
1888 if (strv_extend(&p, "IPv6AddressState") < 0)
1889 log_oom();
1890 }
1891
1892 if (link->operstate != operstate) {
1893 link->operstate = operstate;
1894 changed = true;
1895 if (strv_extend(&p, "OperationalState") < 0)
1896 log_oom();
1897 }
1898
1899 if (link->online_state != online_state) {
1900 link->online_state = online_state;
1901 changed = true;
1902 if (strv_extend(&p, "OnlineState") < 0)
1903 log_oom();
1904 }
1905
1906 if (p)
1907 link_send_changed_strv(link, p);
1908 if (changed)
1909 link_dirty(link);
1910
1911 if (also_update_master) {
1912 Link *master;
1913
1914 if (link_get_master(link, &master) >= 0)
1915 link_update_operstate(master, true);
1916 }
1917 }
1918
1919 #define FLAG_STRING(string, flag, old, new) \
1920 (((old ^ new) & flag) \
1921 ? ((old & flag) ? (" -" string) : (" +" string)) \
1922 : "")
1923
1924 static int link_update_flags(Link *link, sd_netlink_message *message) {
1925 bool link_was_admin_up, had_carrier;
1926 uint8_t operstate;
1927 unsigned flags;
1928 int r;
1929
1930 assert(link);
1931 assert(message);
1932
1933 r = sd_rtnl_message_link_get_flags(message, &flags);
1934 if (r < 0)
1935 return log_link_debug_errno(link, r, "rtnl: failed to read link flags: %m");
1936
1937 r = sd_netlink_message_read_u8(message, IFLA_OPERSTATE, &operstate);
1938 if (r == -ENODATA)
1939 /* If we got a message without operstate, assume the state was unchanged. */
1940 operstate = link->kernel_operstate;
1941 else if (r < 0)
1942 return log_link_debug_errno(link, r, "rtnl: failed to read operational state: %m");
1943
1944 if (link->flags == flags && link->kernel_operstate == operstate)
1945 return 0;
1946
1947 if (link->flags != flags) {
1948 unsigned unknown_flags, unknown_flags_added, unknown_flags_removed;
1949
1950 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",
1951 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
1952 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
1953 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
1954 FLAG_STRING("UP", IFF_UP, link->flags, flags),
1955 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
1956 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
1957 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
1958 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
1959 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
1960 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
1961 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
1962 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
1963 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
1964 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
1965 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
1966 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
1967 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
1968 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
1969 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
1970
1971 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
1972 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
1973 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
1974 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
1975 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
1976 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
1977 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
1978 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
1979
1980 if (unknown_flags_added)
1981 log_link_debug(link, "Unknown link flags gained, ignoring: %#.5x", unknown_flags_added);
1982
1983 if (unknown_flags_removed)
1984 log_link_debug(link, "Unknown link flags lost, ignoring: %#.5x", unknown_flags_removed);
1985 }
1986
1987 link_was_admin_up = link->flags & IFF_UP;
1988 had_carrier = link_has_carrier(link);
1989
1990 link->flags = flags;
1991 link->kernel_operstate = operstate;
1992
1993 link_update_operstate(link, true);
1994
1995 if (!link_was_admin_up && (link->flags & IFF_UP)) {
1996 log_link_info(link, "Link UP");
1997
1998 r = link_admin_state_up(link);
1999 if (r < 0)
2000 return r;
2001 } else if (link_was_admin_up && !(link->flags & IFF_UP)) {
2002 log_link_info(link, "Link DOWN");
2003
2004 r = link_admin_state_down(link);
2005 if (r < 0)
2006 return r;
2007 }
2008
2009 if (!had_carrier && link_has_carrier(link)) {
2010 log_link_info(link, "Gained carrier");
2011
2012 r = link_carrier_gained(link);
2013 if (r < 0)
2014 return r;
2015 } else if (had_carrier && !link_has_carrier(link)) {
2016 log_link_info(link, "Lost carrier");
2017
2018 r = link_carrier_lost(link);
2019 if (r < 0)
2020 return r;
2021 }
2022
2023 return 0;
2024 }
2025
2026 static int link_update_master(Link *link, sd_netlink_message *message) {
2027 int master_ifindex, r;
2028
2029 assert(link);
2030 assert(message);
2031
2032 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t*) &master_ifindex);
2033 if (r == -ENODATA)
2034 return 0;
2035 if (r < 0)
2036 return log_link_debug_errno(link, r, "rtnl: failed to read master ifindex: %m");
2037
2038 if (master_ifindex == link->ifindex)
2039 master_ifindex = 0;
2040
2041 if (master_ifindex != link->master_ifindex) {
2042 if (link->master_ifindex == 0)
2043 log_link_debug(link, "Attached to master interface: %i", master_ifindex);
2044 else if (master_ifindex == 0)
2045 log_link_debug(link, "Detached from master interface: %i", link->master_ifindex);
2046 else
2047 log_link_debug(link, "Master interface changed: %i %s %i", link->master_ifindex,
2048 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), master_ifindex);
2049
2050 link_drop_from_master(link);
2051 link->master_ifindex = master_ifindex;
2052 }
2053
2054 r = link_append_to_master(link);
2055 if (r < 0)
2056 return log_link_debug_errno(link, r, "Failed to append link to master: %m");
2057
2058 return 0;
2059 }
2060
2061 static int link_update_driver(Link *link, sd_netlink_message *message) {
2062 int r;
2063
2064 assert(link);
2065 assert(link->manager);
2066 assert(message);
2067
2068 /* Driver is already read. Assuming the driver is never changed. */
2069 if (link->ethtool_driver_read)
2070 return 0;
2071
2072 /* When udevd is running, read the driver after the interface is initialized by udevd.
2073 * Otherwise, ethtool may not work correctly. See issue #22538.
2074 * When udevd is not running, read the value when the interface is detected. */
2075 if (udev_available() && !link->dev)
2076 return 0;
2077
2078 link->ethtool_driver_read = true;
2079
2080 r = ethtool_get_driver(&link->manager->ethtool_fd, link->ifname, &link->driver);
2081 if (r < 0) {
2082 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
2083 return 0;
2084 }
2085
2086 log_link_debug(link, "Found driver: %s", strna(link->driver));
2087
2088 if (streq_ptr(link->driver, "dsa")) {
2089 uint32_t dsa_master_ifindex = 0;
2090
2091 r = sd_netlink_message_read_u32(message, IFLA_LINK, &dsa_master_ifindex);
2092 if (r < 0 && r != -ENODATA)
2093 return log_link_debug_errno(link, r, "rtnl: failed to read ifindex of the DSA master interface: %m");
2094
2095 if (dsa_master_ifindex > INT_MAX) {
2096 log_link_debug(link, "rtnl: received too large DSA master ifindex (%"PRIu32" > INT_MAX), ignoring.",
2097 dsa_master_ifindex);
2098 dsa_master_ifindex = 0;
2099 }
2100
2101 link->dsa_master_ifindex = (int) dsa_master_ifindex;
2102 }
2103
2104 return 1; /* needs reconfigure */
2105 }
2106
2107 static int link_update_permanent_hardware_address_from_ethtool(Link *link, sd_netlink_message *message) {
2108 int r;
2109
2110 assert(link);
2111 assert(link->manager);
2112 assert(message);
2113
2114 if (link->ethtool_permanent_hw_addr_read)
2115 return 0;
2116
2117 /* When udevd is running, read the permanent hardware address after the interface is
2118 * initialized by udevd. Otherwise, ethtool may not work correctly. See issue #22538.
2119 * When udevd is not running, read the value when the interface is detected. */
2120 if (udev_available() && !link->dev)
2121 return 0;
2122
2123 /* If the interface does not have a hardware address, then it will not have a permanent address either. */
2124 r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, NULL);
2125 if (r == -ENODATA)
2126 return 0;
2127 if (r < 0)
2128 return log_link_debug_errno(link, r, "Failed to read IFLA_ADDRESS attribute: %m");
2129
2130 link->ethtool_permanent_hw_addr_read = true;
2131
2132 r = ethtool_get_permanent_hw_addr(&link->manager->ethtool_fd, link->ifname, &link->permanent_hw_addr);
2133 if (r < 0)
2134 log_link_debug_errno(link, r, "Permanent hardware address not found, continuing without: %m");
2135
2136 return 0;
2137 }
2138
2139 static int link_update_permanent_hardware_address(Link *link, sd_netlink_message *message) {
2140 int r;
2141
2142 assert(link);
2143 assert(link->manager);
2144 assert(message);
2145
2146 if (link->permanent_hw_addr.length > 0)
2147 return 0;
2148
2149 r = netlink_message_read_hw_addr(message, IFLA_PERM_ADDRESS, &link->permanent_hw_addr);
2150 if (r < 0) {
2151 if (r != -ENODATA)
2152 return log_link_debug_errno(link, r, "Failed to read IFLA_PERM_ADDRESS attribute: %m");
2153
2154 /* Fallback to ethtool for older kernels. */
2155 r = link_update_permanent_hardware_address_from_ethtool(link, message);
2156 if (r < 0)
2157 return r;
2158 }
2159
2160 if (link->permanent_hw_addr.length > 0)
2161 log_link_debug(link, "Saved permanent hardware address: %s", HW_ADDR_TO_STR(&link->permanent_hw_addr));
2162
2163 return 1; /* needs reconfigure */
2164 }
2165
2166 static int link_update_hardware_address(Link *link, sd_netlink_message *message) {
2167 struct hw_addr_data addr;
2168 int r;
2169
2170 assert(link);
2171 assert(message);
2172
2173 r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr);
2174 if (r < 0 && r != -ENODATA)
2175 return log_link_debug_errno(link, r, "rtnl: failed to read broadcast address: %m");
2176
2177 r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &addr);
2178 if (r == -ENODATA)
2179 return 0;
2180 if (r < 0)
2181 return log_link_debug_errno(link, r, "rtnl: failed to read hardware address: %m");
2182
2183 if (hw_addr_equal(&link->hw_addr, &addr))
2184 return 0;
2185
2186 if (link->hw_addr.length == 0)
2187 log_link_debug(link, "Saved hardware address: %s", HW_ADDR_TO_STR(&addr));
2188 else {
2189 log_link_debug(link, "Hardware address is changed: %s %s %s",
2190 HW_ADDR_TO_STR(&link->hw_addr),
2191 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT),
2192 HW_ADDR_TO_STR(&addr));
2193
2194 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
2195 }
2196
2197 link->hw_addr = addr;
2198
2199 if (!hw_addr_is_null(&link->hw_addr)) {
2200 r = hashmap_ensure_put(&link->manager->links_by_hw_addr, &hw_addr_hash_ops, &link->hw_addr, link);
2201 if (r == -EEXIST && streq_ptr(link->kind, "bond"))
2202 /* bonding master and its slaves have the same hardware address. */
2203 r = hashmap_replace(link->manager->links_by_hw_addr, &link->hw_addr, link);
2204 if (r < 0)
2205 log_link_debug_errno(link, r, "Failed to manage link by its new hardware address, ignoring: %m");
2206 }
2207
2208 r = ipv4acd_update_mac(link);
2209 if (r < 0)
2210 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m");
2211
2212 r = ipv4ll_update_mac(link);
2213 if (r < 0)
2214 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
2215
2216 r = dhcp4_update_mac(link);
2217 if (r < 0)
2218 return log_link_debug_errno(link, r, "Could not update MAC address in DHCP client: %m");
2219
2220 r = dhcp6_update_mac(link);
2221 if (r < 0)
2222 return log_link_debug_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
2223
2224 r = radv_update_mac(link);
2225 if (r < 0)
2226 return log_link_debug_errno(link, r, "Could not update MAC address for Router Advertisement: %m");
2227
2228 if (link->ndisc && link->hw_addr.length == ETH_ALEN) {
2229 r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether);
2230 if (r < 0)
2231 return log_link_debug_errno(link, r, "Could not update MAC for NDisc: %m");
2232 }
2233
2234 if (link->lldp_rx) {
2235 r = sd_lldp_rx_set_filter_address(link->lldp_rx, &link->hw_addr.ether);
2236 if (r < 0)
2237 return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Rx: %m");
2238 }
2239
2240 if (link->lldp_tx) {
2241 r = sd_lldp_tx_set_hwaddr(link->lldp_tx, &link->hw_addr.ether);
2242 if (r < 0)
2243 return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Tx: %m");
2244 }
2245
2246 return 1; /* needs reconfigure */
2247 }
2248
2249 static int link_update_mtu(Link *link, sd_netlink_message *message) {
2250 uint32_t mtu, min_mtu = 0, max_mtu = UINT32_MAX;
2251 int r;
2252
2253 assert(link);
2254 assert(message);
2255
2256 r = sd_netlink_message_read_u32(message, IFLA_MTU, &mtu);
2257 if (r == -ENODATA)
2258 return 0;
2259 if (r < 0)
2260 return log_link_debug_errno(link, r, "rtnl: failed to read MTU in RTM_NEWLINK message: %m");
2261 if (mtu == 0)
2262 return 0;
2263
2264 r = sd_netlink_message_read_u32(message, IFLA_MIN_MTU, &min_mtu);
2265 if (r < 0 && r != -ENODATA)
2266 return log_link_debug_errno(link, r, "rtnl: failed to read minimum MTU in RTM_NEWLINK message: %m");
2267
2268 r = sd_netlink_message_read_u32(message, IFLA_MAX_MTU, &max_mtu);
2269 if (r < 0 && r != -ENODATA)
2270 return log_link_debug_errno(link, r, "rtnl: failed to read maximum MTU in RTM_NEWLINK message: %m");
2271
2272 if (max_mtu == 0)
2273 max_mtu = UINT32_MAX;
2274
2275 link->min_mtu = min_mtu;
2276 link->max_mtu = max_mtu;
2277
2278 if (link->original_mtu == 0) {
2279 link->original_mtu = mtu;
2280 log_link_debug(link, "Saved original MTU %" PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2281 link->original_mtu, link->min_mtu, link->max_mtu);
2282 }
2283
2284 if (link->mtu == mtu)
2285 return 0;
2286
2287 if (link->mtu != 0)
2288 log_link_debug(link, "MTU is changed: %"PRIu32" %s %"PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2289 link->mtu, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), mtu,
2290 link->min_mtu, link->max_mtu);
2291
2292 link->mtu = mtu;
2293
2294 if (link->dhcp_client) {
2295 r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
2296 if (r < 0)
2297 return log_link_debug_errno(link, r, "Could not update MTU in DHCP client: %m");
2298 }
2299
2300 if (link->radv) {
2301 r = sd_radv_set_mtu(link->radv, link->mtu);
2302 if (r < 0)
2303 return log_link_debug_errno(link, r, "Could not set MTU for Router Advertisement: %m");
2304 }
2305
2306 return 0;
2307 }
2308
2309 static int link_update_alternative_names(Link *link, sd_netlink_message *message) {
2310 _cleanup_strv_free_ char **altnames = NULL;
2311 int r;
2312
2313 assert(link);
2314 assert(message);
2315
2316 r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &altnames);
2317 if (r == -ENODATA)
2318 /* The message does not have IFLA_PROP_LIST container attribute. It does not mean the
2319 * interface has no alternative name. */
2320 return 0;
2321 if (r < 0)
2322 return log_link_debug_errno(link, r, "rtnl: failed to read alternative names: %m");
2323
2324 if (strv_equal(altnames, link->alternative_names))
2325 return 0;
2326
2327 STRV_FOREACH(n, link->alternative_names)
2328 hashmap_remove(link->manager->links_by_name, *n);
2329
2330 strv_free_and_replace(link->alternative_names, altnames);
2331
2332 STRV_FOREACH(n, link->alternative_names) {
2333 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, *n, link);
2334 if (r < 0)
2335 return log_link_debug_errno(link, r, "Failed to manage link by its new alternative names: %m");
2336 }
2337
2338 return 1; /* needs reconfigure */
2339 }
2340
2341 static int link_update_name(Link *link, sd_netlink_message *message) {
2342 char ifname_from_index[IF_NAMESIZE];
2343 const char *ifname;
2344 int r;
2345
2346 assert(link);
2347 assert(message);
2348
2349 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
2350 if (r == -ENODATA)
2351 /* Hmm?? But ok. */
2352 return 0;
2353 if (r < 0)
2354 return log_link_debug_errno(link, r, "Failed to read interface name in RTM_NEWLINK message: %m");
2355
2356 if (streq(ifname, link->ifname))
2357 return 0;
2358
2359 r = format_ifname(link->ifindex, ifname_from_index);
2360 if (r < 0)
2361 return log_link_debug_errno(link, r, "Could not get interface name for index %i.", link->ifindex);
2362
2363 if (!streq(ifname, ifname_from_index)) {
2364 log_link_debug(link, "New interface name '%s' received from the kernel does not correspond "
2365 "with the name currently configured on the actual interface '%s'. Ignoring.",
2366 ifname, ifname_from_index);
2367 return 0;
2368 }
2369
2370 log_link_info(link, "Interface name change detected, renamed to %s.", ifname);
2371
2372 hashmap_remove(link->manager->links_by_name, link->ifname);
2373
2374 r = free_and_strdup(&link->ifname, ifname);
2375 if (r < 0)
2376 return log_oom_debug();
2377
2378 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, link->ifname, link);
2379 if (r < 0)
2380 return log_link_debug_errno(link, r, "Failed to manage link by its new name: %m");
2381
2382 if (link->dhcp_client) {
2383 r = sd_dhcp_client_set_ifname(link->dhcp_client, link->ifname);
2384 if (r < 0)
2385 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP client: %m");
2386 }
2387
2388 if (link->dhcp6_client) {
2389 r = sd_dhcp6_client_set_ifname(link->dhcp6_client, link->ifname);
2390 if (r < 0)
2391 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP6 client: %m");
2392 }
2393
2394 if (link->ndisc) {
2395 r = sd_ndisc_set_ifname(link->ndisc, link->ifname);
2396 if (r < 0)
2397 return log_link_debug_errno(link, r, "Failed to update interface name in NDisc: %m");
2398 }
2399
2400 if (link->dhcp_server) {
2401 r = sd_dhcp_server_set_ifname(link->dhcp_server, link->ifname);
2402 if (r < 0)
2403 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP server: %m");
2404 }
2405
2406 if (link->radv) {
2407 r = sd_radv_set_ifname(link->radv, link->ifname);
2408 if (r < 0)
2409 return log_link_debug_errno(link, r, "Failed to update interface name in Router Advertisement: %m");
2410 }
2411
2412 if (link->lldp_rx) {
2413 r = sd_lldp_rx_set_ifname(link->lldp_rx, link->ifname);
2414 if (r < 0)
2415 return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Rx: %m");
2416 }
2417
2418 if (link->lldp_tx) {
2419 r = sd_lldp_tx_set_ifname(link->lldp_tx, link->ifname);
2420 if (r < 0)
2421 return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Tx: %m");
2422 }
2423
2424 if (link->ipv4ll) {
2425 r = sd_ipv4ll_set_ifname(link->ipv4ll, link->ifname);
2426 if (r < 0)
2427 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4LL client: %m");
2428 }
2429
2430 r = ipv4acd_set_ifname(link);
2431 if (r < 0)
2432 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4ACD client: %m");
2433
2434 return 1; /* needs reconfigure */
2435 }
2436
2437 static int link_update(Link *link, sd_netlink_message *message) {
2438 bool needs_reconfigure = false;
2439 int r;
2440
2441 assert(link);
2442 assert(message);
2443
2444 r = link_update_name(link, message);
2445 if (r < 0)
2446 return r;
2447 needs_reconfigure = needs_reconfigure || r > 0;
2448
2449 r = link_update_alternative_names(link, message);
2450 if (r < 0)
2451 return r;
2452 needs_reconfigure = needs_reconfigure || r > 0;
2453
2454 r = link_update_mtu(link, message);
2455 if (r < 0)
2456 return r;
2457
2458 r = link_update_driver(link, message);
2459 if (r < 0)
2460 return r;
2461 needs_reconfigure = needs_reconfigure || r > 0;
2462
2463 r = link_update_permanent_hardware_address(link, message);
2464 if (r < 0)
2465 return r;
2466 needs_reconfigure = needs_reconfigure || r > 0;
2467
2468 r = link_update_hardware_address(link, message);
2469 if (r < 0)
2470 return r;
2471 needs_reconfigure = needs_reconfigure || r > 0;
2472
2473 r = link_update_master(link, message);
2474 if (r < 0)
2475 return r;
2476
2477 r = link_update_ipv6ll_addrgen_mode(link, message);
2478 if (r < 0)
2479 return r;
2480
2481 r = link_update_flags(link, message);
2482 if (r < 0)
2483 return r;
2484
2485 r = link_update_bridge_vlan(link, message);
2486 if (r < 0)
2487 return r;
2488
2489 return needs_reconfigure;
2490 }
2491
2492 static Link *link_drop_or_unref(Link *link) {
2493 if (!link)
2494 return NULL;
2495 if (!link->manager)
2496 return link_unref(link);
2497 return link_drop(link);
2498 }
2499
2500 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_drop_or_unref);
2501
2502 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
2503 _cleanup_free_ char *ifname = NULL, *kind = NULL, *state_file = NULL, *lease_file = NULL, *lldp_file = NULL;
2504 _cleanup_(link_drop_or_unrefp) Link *link = NULL;
2505 unsigned short iftype;
2506 int r, ifindex;
2507
2508 assert(manager);
2509 assert(message);
2510 assert(ret);
2511
2512 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2513 if (r < 0)
2514 return log_debug_errno(r, "rtnl: failed to read ifindex from link message: %m");
2515 else if (ifindex <= 0)
2516 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "rtnl: received link message without valid ifindex.");
2517
2518 r = sd_rtnl_message_link_get_type(message, &iftype);
2519 if (r < 0)
2520 return log_debug_errno(r, "rtnl: failed to read interface type from link message: %m");
2521
2522 r = sd_netlink_message_read_string_strdup(message, IFLA_IFNAME, &ifname);
2523 if (r < 0)
2524 return log_debug_errno(r, "rtnl: failed to read interface name from link message: %m");
2525
2526 /* check for link kind */
2527 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
2528 if (r >= 0) {
2529 r = sd_netlink_message_read_string_strdup(message, IFLA_INFO_KIND, &kind);
2530 if (r < 0 && r != -ENODATA)
2531 return log_debug_errno(r, "rtnl: failed to read interface kind from link message: %m");
2532 r = sd_netlink_message_exit_container(message);
2533 if (r < 0)
2534 return log_debug_errno(r, "rtnl: failed to exit IFLA_LINKINFO container: %m");
2535 }
2536
2537 if (!manager->test_mode) {
2538 /* Do not update state files when running in test mode. */
2539 if (asprintf(&state_file, "/run/systemd/netif/links/%d", ifindex) < 0)
2540 return log_oom_debug();
2541
2542 if (asprintf(&lease_file, "/run/systemd/netif/leases/%d", ifindex) < 0)
2543 return log_oom_debug();
2544
2545 if (asprintf(&lldp_file, "/run/systemd/netif/lldp/%d", ifindex) < 0)
2546 return log_oom_debug();
2547 }
2548
2549 link = new(Link, 1);
2550 if (!link)
2551 return -ENOMEM;
2552
2553 *link = (Link) {
2554 .n_ref = 1,
2555 .state = LINK_STATE_PENDING,
2556 .online_state = _LINK_ONLINE_STATE_INVALID,
2557 .ifindex = ifindex,
2558 .iftype = iftype,
2559 .ifname = TAKE_PTR(ifname),
2560 .kind = TAKE_PTR(kind),
2561
2562 .bridge_vlan_pvid = UINT16_MAX,
2563
2564 .ipv6ll_address_gen_mode = _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_INVALID,
2565
2566 .state_file = TAKE_PTR(state_file),
2567 .lease_file = TAKE_PTR(lease_file),
2568 .lldp_file = TAKE_PTR(lldp_file),
2569
2570 .n_dns = UINT_MAX,
2571 .dns_default_route = -1,
2572 .llmnr = _RESOLVE_SUPPORT_INVALID,
2573 .mdns = _RESOLVE_SUPPORT_INVALID,
2574 .dnssec_mode = _DNSSEC_MODE_INVALID,
2575 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
2576 };
2577
2578 r = hashmap_ensure_put(&manager->links_by_index, NULL, INT_TO_PTR(link->ifindex), link);
2579 if (r < 0)
2580 return log_link_debug_errno(link, r, "Failed to store link into manager: %m");
2581
2582 link->manager = manager;
2583
2584 r = hashmap_ensure_put(&manager->links_by_name, &string_hash_ops, link->ifname, link);
2585 if (r < 0)
2586 return log_link_debug_errno(link, r, "Failed to manage link by its interface name: %m");
2587
2588 log_link_debug(link, "Saved new link: ifindex=%i, iftype=%s(%u), kind=%s",
2589 link->ifindex, strna(arphrd_to_name(link->iftype)), link->iftype, strna(link->kind));
2590
2591 /* If contained in this set, the link is wireless and the corresponding NL80211_CMD_NEW_INTERFACE
2592 * message arrived too early. Request the wireless link information again.
2593 */
2594 if (set_remove(manager->new_wlan_ifindices, INT_TO_PTR(link->ifindex))) {
2595 r = link_get_wlan_interface(link);
2596 if (r < 0)
2597 log_link_warning_errno(link, r, "Failed to get wireless interface, ignoring: %m");
2598 }
2599
2600 *ret = TAKE_PTR(link);
2601 return 0;
2602 }
2603
2604 int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, Manager *manager) {
2605 Link *link = NULL;
2606 NetDev *netdev = NULL;
2607 uint16_t type;
2608 const char *name;
2609 int r, ifindex;
2610
2611 assert(rtnl);
2612 assert(message);
2613 assert(manager);
2614
2615 if (sd_netlink_message_is_error(message)) {
2616 r = sd_netlink_message_get_errno(message);
2617 if (r < 0)
2618 log_message_warning_errno(message, r, "rtnl: Could not receive link message, ignoring");
2619
2620 return 0;
2621 }
2622
2623 r = sd_netlink_message_get_type(message, &type);
2624 if (r < 0) {
2625 log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
2626 return 0;
2627 } else if (!IN_SET(type, RTM_NEWLINK, RTM_DELLINK)) {
2628 log_warning("rtnl: Received unexpected message type %u when processing link, ignoring.", type);
2629 return 0;
2630 }
2631
2632 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2633 if (r < 0) {
2634 log_warning_errno(r, "rtnl: Could not get ifindex from link message, ignoring: %m");
2635 return 0;
2636 } else if (ifindex <= 0) {
2637 log_warning("rtnl: received link message with invalid ifindex %d, ignoring.", ifindex);
2638 return 0;
2639 }
2640
2641 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
2642 if (r < 0) {
2643 log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
2644 return 0;
2645 }
2646
2647 (void) link_get_by_index(manager, ifindex, &link);
2648 (void) netdev_get(manager, name, &netdev);
2649
2650 switch (type) {
2651 case RTM_NEWLINK:
2652 if (netdev) {
2653 /* netdev exists, so make sure the ifindex matches */
2654 r = netdev_set_ifindex(netdev, message);
2655 if (r < 0) {
2656 log_netdev_warning_errno(netdev, r, "Could not process new link message for netdev, ignoring: %m");
2657 return 0;
2658 }
2659 }
2660
2661 if (!link) {
2662 /* link is new, so add it */
2663 r = link_new(manager, message, &link);
2664 if (r < 0) {
2665 log_warning_errno(r, "Could not process new link message: %m");
2666 return 0;
2667 }
2668
2669 r = link_update(link, message);
2670 if (r < 0) {
2671 log_link_warning_errno(link, r, "Could not process link message: %m");
2672 link_enter_failed(link);
2673 return 0;
2674 }
2675
2676 r = link_check_initialized(link);
2677 if (r < 0) {
2678 log_link_warning_errno(link, r, "Failed to check link is initialized: %m");
2679 link_enter_failed(link);
2680 return 0;
2681 }
2682 } else {
2683 r = link_update(link, message);
2684 if (r < 0) {
2685 log_link_warning_errno(link, r, "Could not process link message: %m");
2686 link_enter_failed(link);
2687 return 0;
2688 }
2689 if (r > 0) {
2690 r = link_reconfigure_impl(link, /* force = */ false);
2691 if (r < 0) {
2692 log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
2693 link_enter_failed(link);
2694 return 0;
2695 }
2696 }
2697 }
2698 break;
2699
2700 case RTM_DELLINK:
2701 link_drop(link);
2702 netdev_drop(netdev);
2703 break;
2704
2705 default:
2706 assert_not_reached();
2707 }
2708
2709 return 1;
2710 }
2711
2712 int link_getlink_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, const char *error_msg) {
2713 uint16_t message_type;
2714 int r;
2715
2716 assert(m);
2717 assert(link);
2718 assert(error_msg);
2719
2720 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2721 return 0;
2722
2723 r = sd_netlink_message_get_errno(m);
2724 if (r < 0) {
2725 log_link_message_warning_errno(link, m, r, error_msg);
2726 link_enter_failed(link);
2727 return 0;
2728 }
2729
2730 r = sd_netlink_message_get_type(m, &message_type);
2731 if (r < 0) {
2732 log_link_debug_errno(link, r, "rtnl: failed to read link message type, ignoring: %m");
2733 return 0;
2734 }
2735 if (message_type != RTM_NEWLINK) {
2736 log_link_debug(link, "rtnl: received invalid link message type, ignoring.");
2737 return 0;
2738 }
2739
2740 r = link_update(link, m);
2741 if (r < 0) {
2742 link_enter_failed(link);
2743 return 0;
2744 }
2745
2746 return 1;
2747 }
2748
2749 int link_call_getlink(Link *link, link_netlink_message_handler_t callback) {
2750 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2751 int r;
2752
2753 assert(link);
2754 assert(link->manager);
2755 assert(link->manager->rtnl);
2756 assert(callback);
2757
2758 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
2759 if (r < 0)
2760 return r;
2761
2762 r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
2763 link_netlink_destroy_callback, link);
2764 if (r < 0)
2765 return r;
2766
2767 link_ref(link);
2768 return 0;
2769 }
2770
2771 static const char* const link_state_table[_LINK_STATE_MAX] = {
2772 [LINK_STATE_PENDING] = "pending",
2773 [LINK_STATE_INITIALIZED] = "initialized",
2774 [LINK_STATE_CONFIGURING] = "configuring",
2775 [LINK_STATE_CONFIGURED] = "configured",
2776 [LINK_STATE_UNMANAGED] = "unmanaged",
2777 [LINK_STATE_FAILED] = "failed",
2778 [LINK_STATE_LINGER] = "linger",
2779 };
2780
2781 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
2782
2783 int link_flags_to_string_alloc(uint32_t flags, char **ret) {
2784 _cleanup_free_ char *str = NULL;
2785 static const char* map[] = {
2786 [LOG2U(IFF_UP)] = "up", /* interface is up. */
2787 [LOG2U(IFF_BROADCAST)] = "broadcast", /* broadcast address valid. */
2788 [LOG2U(IFF_DEBUG)] = "debug", /* turn on debugging. */
2789 [LOG2U(IFF_LOOPBACK)] = "loopback", /* interface is a loopback net. */
2790 [LOG2U(IFF_POINTOPOINT)] = "point-to-point", /* interface has p-p link. */
2791 [LOG2U(IFF_NOTRAILERS)] = "no-trailers", /* avoid use of trailers. */
2792 [LOG2U(IFF_RUNNING)] = "running", /* interface RFC2863 OPER_UP. */
2793 [LOG2U(IFF_NOARP)] = "no-arp", /* no ARP protocol. */
2794 [LOG2U(IFF_PROMISC)] = "promiscuous", /* receive all packets. */
2795 [LOG2U(IFF_ALLMULTI)] = "all-multicast", /* receive all multicast packets. */
2796 [LOG2U(IFF_MASTER)] = "master", /* master of a load balancer. */
2797 [LOG2U(IFF_SLAVE)] = "slave", /* slave of a load balancer. */
2798 [LOG2U(IFF_MULTICAST)] = "multicast", /* supports multicast. */
2799 [LOG2U(IFF_PORTSEL)] = "portsel", /* can set media type. */
2800 [LOG2U(IFF_AUTOMEDIA)] = "auto-media", /* auto media select active. */
2801 [LOG2U(IFF_DYNAMIC)] = "dynamic", /* dialup device with changing addresses. */
2802 [LOG2U(IFF_LOWER_UP)] = "lower-up", /* driver signals L1 up. */
2803 [LOG2U(IFF_DORMANT)] = "dormant", /* driver signals dormant. */
2804 [LOG2U(IFF_ECHO)] = "echo", /* echo sent packets. */
2805 };
2806
2807 assert(ret);
2808
2809 for (size_t i = 0; i < ELEMENTSOF(map); i++)
2810 if (FLAGS_SET(flags, 1 << i) && map[i])
2811 if (!strextend_with_separator(&str, ",", map[i]))
2812 return -ENOMEM;
2813
2814 *ret = TAKE_PTR(str);
2815 return 0;
2816 }
2817
2818 static const char * const kernel_operstate_table[] = {
2819 [IF_OPER_UNKNOWN] = "unknown",
2820 [IF_OPER_NOTPRESENT] = "not-present",
2821 [IF_OPER_DOWN] = "down",
2822 [IF_OPER_LOWERLAYERDOWN] = "lower-layer-down",
2823 [IF_OPER_TESTING] = "testing",
2824 [IF_OPER_DORMANT] = "dormant",
2825 [IF_OPER_UP] = "up",
2826 };
2827
2828 DEFINE_STRING_TABLE_LOOKUP_TO_STRING(kernel_operstate, int);
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