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[thirdparty/systemd.git] / src / network / networkd-link.c
1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include <linux/if.h>
4 #include <linux/if_arp.h>
5 #include <linux/if_link.h>
6 #include <linux/netdevice.h>
7 #include <net/if.h>
8 #include <sys/socket.h>
9 #include <unistd.h>
10
11 #include "sd-bus.h"
12 #include "sd-dhcp-client.h"
13 #include "sd-dhcp-server.h"
14 #include "sd-dhcp6-client.h"
15 #include "sd-dhcp6-lease.h"
16 #include "sd-ipv4ll.h"
17 #include "sd-lldp-rx.h"
18 #include "sd-ndisc.h"
19 #include "sd-netlink.h"
20 #include "sd-radv.h"
21
22 #include "alloc-util.h"
23 #include "arphrd-util.h"
24 #include "bitfield.h"
25 #include "device-util.h"
26 #include "errno-util.h"
27 #include "ethtool-util.h"
28 #include "event-util.h"
29 #include "format-ifname.h"
30 #include "fs-util.h"
31 #include "glyph-util.h"
32 #include "logarithm.h"
33 #include "netif-util.h"
34 #include "netlink-util.h"
35 #include "networkd-address.h"
36 #include "networkd-address-label.h"
37 #include "networkd-bridge-fdb.h"
38 #include "networkd-bridge-mdb.h"
39 #include "networkd-bridge-vlan.h"
40 #include "networkd-dhcp-prefix-delegation.h"
41 #include "networkd-dhcp-server.h"
42 #include "networkd-dhcp4.h"
43 #include "networkd-dhcp6.h"
44 #include "networkd-ipv4acd.h"
45 #include "networkd-ipv4ll.h"
46 #include "networkd-ipv6-proxy-ndp.h"
47 #include "networkd-link.h"
48 #include "networkd-link-bus.h"
49 #include "networkd-lldp-tx.h"
50 #include "networkd-manager.h"
51 #include "networkd-ndisc.h"
52 #include "networkd-neighbor.h"
53 #include "networkd-nexthop.h"
54 #include "networkd-queue.h"
55 #include "networkd-radv.h"
56 #include "networkd-route.h"
57 #include "networkd-route-util.h"
58 #include "networkd-routing-policy-rule.h"
59 #include "networkd-setlink.h"
60 #include "networkd-sriov.h"
61 #include "networkd-state-file.h"
62 #include "networkd-sysctl.h"
63 #include "networkd-wifi.h"
64 #include "ordered-set.h"
65 #include "parse-util.h"
66 #include "set.h"
67 #include "socket-util.h"
68 #include "string-table.h"
69 #include "string-util.h"
70 #include "strv.h"
71 #include "tc.h"
72 #include "udev-util.h"
73
74 void link_required_operstate_for_online(Link *link, LinkOperationalStateRange *ret) {
75 assert(link);
76 assert(ret);
77
78 if (link->network && operational_state_range_is_valid(&link->network->required_operstate_for_online))
79 /* If explicitly specified, use it as is. */
80 *ret = link->network->required_operstate_for_online;
81 else if (link->iftype == ARPHRD_CAN)
82 /* CAN devices do not support addressing, hence defaults to 'carrier'. */
83 *ret = (const LinkOperationalStateRange) {
84 .min = LINK_OPERSTATE_CARRIER,
85 .max = LINK_OPERSTATE_CARRIER,
86 };
87 else if (link->network && link->network->bond)
88 /* Bonding slaves do not support addressing. */
89 *ret = (const LinkOperationalStateRange) {
90 .min = LINK_OPERSTATE_ENSLAVED,
91 .max = LINK_OPERSTATE_ENSLAVED,
92 };
93 else if (STRPTR_IN_SET(link->kind, "batadv", "bond", "bridge", "vrf"))
94 /* Some of slave interfaces may be offline. */
95 *ret = (const LinkOperationalStateRange) {
96 .min = LINK_OPERSTATE_DEGRADED_CARRIER,
97 .max = LINK_OPERSTATE_ROUTABLE,
98 };
99 else
100 *ret = LINK_OPERSTATE_RANGE_DEFAULT;
101 }
102
103 AddressFamily link_required_family_for_online(Link *link) {
104 assert(link);
105
106 if (link->network && link->network->required_family_for_online >= 0)
107 return link->network->required_family_for_online;
108
109 if (link->network && operational_state_range_is_valid(&link->network->required_operstate_for_online))
110 /* If RequiredForOnline= is explicitly specified, defaults to no. */
111 return ADDRESS_FAMILY_NO;
112
113 if (STRPTR_IN_SET(link->kind, "batadv", "bond", "bridge", "vrf"))
114 /* As the minimum required operstate for master interfaces is 'degraded-carrier',
115 * we should request an address assigned to the link for backward compatibility. */
116 return ADDRESS_FAMILY_YES;
117
118 return ADDRESS_FAMILY_NO;
119 }
120
121 bool link_ipv6_enabled(Link *link) {
122 assert(link);
123
124 if (!socket_ipv6_is_supported())
125 return false;
126
127 if (link->iftype == ARPHRD_CAN)
128 return false;
129
130 if (!link->network)
131 return false;
132
133 if (link->network->bond)
134 return false;
135
136 if (link_ipv6ll_enabled(link))
137 return true;
138
139 if (network_has_static_ipv6_configurations(link->network))
140 return true;
141
142 return false;
143 }
144
145 bool link_has_ipv6_connectivity(Link *link) {
146 LinkAddressState ipv6_address_state;
147
148 assert(link);
149
150 link_get_address_states(link, NULL, &ipv6_address_state, NULL);
151
152 switch (ipv6_address_state) {
153 case LINK_ADDRESS_STATE_ROUTABLE:
154 /* If the interface has a routable IPv6 address, then we assume yes. */
155 return true;
156
157 case LINK_ADDRESS_STATE_DEGRADED:
158 /* If the interface has only degraded IPv6 address (mostly, link-local address), then let's check
159 * there is an IPv6 default gateway. */
160 return link_has_default_gateway(link, AF_INET6);
161
162 case LINK_ADDRESS_STATE_OFF:
163 /* No IPv6 address. */
164 return false;
165
166 default:
167 assert_not_reached();
168 }
169 }
170
171 static bool link_is_ready_to_configure_one(Link *link, bool allow_unmanaged) {
172 assert(link);
173
174 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED, LINK_STATE_UNMANAGED))
175 return false;
176
177 if (!link->network)
178 return allow_unmanaged;
179
180 if (!link->network->configure_without_carrier) {
181 if (link->set_flags_messages > 0)
182 return false;
183
184 if (!link_has_carrier(link))
185 return false;
186 }
187
188 if (link->set_link_messages > 0)
189 return false;
190
191 if (!link->activated)
192 return false;
193
194 return true;
195 }
196
197 bool link_is_ready_to_configure(Link *link, bool allow_unmanaged) {
198 return check_ready_for_all_sr_iov_ports(link, allow_unmanaged, link_is_ready_to_configure_one);
199 }
200
201 bool link_is_ready_to_configure_by_name(Manager *manager, const char *name, bool allow_unmanaged) {
202 assert(manager);
203 assert(name);
204
205 Link *link;
206 if (link_get_by_name(manager, name, &link) < 0)
207 return false;
208
209 return link_is_ready_to_configure(link, allow_unmanaged);
210 }
211
212 void link_ntp_settings_clear(Link *link) {
213 link->ntp = strv_free(link->ntp);
214 }
215
216 void link_dns_settings_clear(Link *link) {
217 if (link->n_dns != UINT_MAX)
218 for (unsigned i = 0; i < link->n_dns; i++)
219 in_addr_full_free(link->dns[i]);
220 link->dns = mfree(link->dns);
221 link->n_dns = UINT_MAX;
222
223 link->search_domains = ordered_set_free(link->search_domains);
224 link->route_domains = ordered_set_free(link->route_domains);
225
226 link->dns_default_route = -1;
227 link->llmnr = _RESOLVE_SUPPORT_INVALID;
228 link->mdns = _RESOLVE_SUPPORT_INVALID;
229 link->dnssec_mode = _DNSSEC_MODE_INVALID;
230 link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
231
232 link->dnssec_negative_trust_anchors = set_free(link->dnssec_negative_trust_anchors);
233 }
234
235 static void link_free_engines(Link *link) {
236 if (!link)
237 return;
238
239 link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
240
241 link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client);
242 link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
243 link->dhcp4_6rd_tunnel_name = mfree(link->dhcp4_6rd_tunnel_name);
244
245 link->lldp_rx = sd_lldp_rx_unref(link->lldp_rx);
246 link->lldp_tx = sd_lldp_tx_unref(link->lldp_tx);
247
248 link->ipv4acd_by_address = hashmap_free(link->ipv4acd_by_address);
249
250 link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
251
252 link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
253 link->dhcp6_lease = sd_dhcp6_lease_unref(link->dhcp6_lease);
254
255 link->ndisc = sd_ndisc_unref(link->ndisc);
256 link->ndisc_expire = sd_event_source_disable_unref(link->ndisc_expire);
257 ndisc_flush(link);
258
259 link->radv = sd_radv_unref(link->radv);
260 }
261
262 static Link* link_free(Link *link) {
263 assert(link);
264
265 (void) link_clear_sysctl_shadows(link);
266
267 link_ntp_settings_clear(link);
268 link_dns_settings_clear(link);
269
270 link->neighbors = set_free(link->neighbors);
271 link->addresses = set_free(link->addresses);
272 link->qdiscs = set_free(link->qdiscs);
273 link->tclasses = set_free(link->tclasses);
274
275 link->dhcp_pd_prefixes = set_free(link->dhcp_pd_prefixes);
276
277 link_free_engines(link);
278
279 set_free(link->sr_iov_virt_port_ifindices);
280 free(link->ifname);
281 strv_free(link->alternative_names);
282 free(link->kind);
283 free(link->ssid);
284 free(link->previous_ssid);
285 free(link->driver);
286
287 unlink_and_free(link->lease_file);
288 unlink_and_free(link->state_file);
289
290 sd_device_unref(link->dev);
291 netdev_unref(link->netdev);
292
293 hashmap_free(link->bound_to_links);
294 hashmap_free(link->bound_by_links);
295
296 set_free(link->slaves);
297
298 network_unref(link->network);
299
300 sd_event_source_disable_unref(link->carrier_lost_timer);
301 sd_event_source_disable_unref(link->ipv6_mtu_wait_synced_event_source);
302
303 return mfree(link);
304 }
305
306 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
307
308 DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(
309 link_hash_ops,
310 void, trivial_hash_func, trivial_compare_func,
311 Link, link_unref);
312
313 int link_get_by_index(Manager *m, int ifindex, Link **ret) {
314 Link *link;
315
316 assert(m);
317
318 if (ifindex <= 0)
319 return -EINVAL;
320
321 link = hashmap_get(m->links_by_index, INT_TO_PTR(ifindex));
322 if (!link)
323 return -ENODEV;
324
325 if (ret)
326 *ret = link;
327 return 0;
328 }
329
330 int link_get_by_name(Manager *m, const char *ifname, Link **ret) {
331 Link *link;
332
333 assert(m);
334 assert(ifname);
335
336 link = hashmap_get(m->links_by_name, ifname);
337 if (!link)
338 return -ENODEV;
339
340 if (ret)
341 *ret = link;
342 return 0;
343 }
344
345 int link_get_by_hw_addr(Manager *m, const struct hw_addr_data *hw_addr, Link **ret) {
346 Link *link;
347
348 assert(m);
349 assert(hw_addr);
350
351 link = hashmap_get(m->links_by_hw_addr, hw_addr);
352 if (!link)
353 return -ENODEV;
354
355 if (ret)
356 *ret = link;
357 return 0;
358 }
359
360 int link_get_master(Link *link, Link **ret) {
361 assert(link);
362 assert(link->manager);
363 assert(ret);
364
365 if (link->master_ifindex <= 0 || link->master_ifindex == link->ifindex)
366 return -ENODEV;
367
368 return link_get_by_index(link->manager, link->master_ifindex, ret);
369 }
370
371 void link_set_state(Link *link, LinkState state) {
372 assert(link);
373
374 if (link->state == state)
375 return;
376
377 log_link_debug(link, "State changed: %s -> %s",
378 link_state_to_string(link->state),
379 link_state_to_string(state));
380
381 link->state = state;
382
383 link_send_changed(link, "AdministrativeState");
384 link_dirty(link);
385 }
386
387 int link_stop_engines(Link *link, bool may_keep_dynamic) {
388 int r, ret = 0;
389
390 assert(link);
391 assert(link->manager);
392 assert(link->manager->event);
393
394 bool keep_dynamic =
395 may_keep_dynamic &&
396 link->network &&
397 (link->manager->state == MANAGER_RESTARTING ||
398 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DYNAMIC_ON_STOP));
399
400 if (!keep_dynamic) {
401 r = sd_dhcp_client_stop(link->dhcp_client);
402 if (r < 0)
403 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv4 client: %m"));
404
405 r = sd_ipv4ll_stop(link->ipv4ll);
406 if (r < 0)
407 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv4 link-local: %m"));
408
409 r = sd_dhcp6_client_stop(link->dhcp6_client);
410 if (r < 0)
411 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv6 client: %m"));
412
413 r = dhcp_pd_remove(link, /* only_marked = */ false);
414 if (r < 0)
415 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not remove DHCPv6 PD addresses and routes: %m"));
416
417 r = ndisc_stop(link);
418 if (r < 0)
419 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv6 Router Discovery: %m"));
420
421 ndisc_flush(link);
422 }
423
424 r = sd_dhcp_server_stop(link->dhcp_server);
425 if (r < 0)
426 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv4 server: %m"));
427
428 r = sd_lldp_rx_stop(link->lldp_rx);
429 if (r < 0)
430 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop LLDP Rx: %m"));
431
432 r = sd_lldp_tx_stop(link->lldp_tx);
433 if (r < 0)
434 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop LLDP Tx: %m"));
435
436 r = ipv4acd_stop(link);
437 if (r < 0)
438 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv4 ACD client: %m"));
439
440 r = sd_radv_stop(link->radv);
441 if (r < 0)
442 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv6 Router Advertisement: %m"));
443
444 return ret;
445 }
446
447 void link_enter_failed(Link *link) {
448 assert(link);
449
450 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
451 return;
452
453 log_link_warning(link, "Failed");
454
455 link_set_state(link, LINK_STATE_FAILED);
456
457 if (!ratelimit_below(&link->automatic_reconfigure_ratelimit)) {
458 log_link_warning(link, "The interface entered the failed state frequently, refusing to reconfigure it automatically.");
459 goto stop;
460 }
461
462 log_link_info(link, "Trying to reconfigure the interface.");
463 if (link_reconfigure(link, LINK_RECONFIGURE_UNCONDITIONALLY) > 0)
464 return;
465
466 stop:
467 (void) link_stop_engines(link, /* may_keep_dynamic = */ false);
468 }
469
470 void link_check_ready(Link *link) {
471 Address *a;
472
473 assert(link);
474
475 if (link->state == LINK_STATE_CONFIGURED)
476 return;
477
478 if (link->state != LINK_STATE_CONFIGURING)
479 return (void) log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state));
480
481 if (!link->network)
482 return (void) log_link_debug(link, "%s(): link is unmanaged.", __func__);
483
484 if (!link->tc_configured)
485 return (void) log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
486
487 if (link->set_link_messages > 0)
488 return (void) log_link_debug(link, "%s(): link layer is configuring.", __func__);
489
490 if (!link->activated)
491 return (void) log_link_debug(link, "%s(): link is not activated.", __func__);
492
493 if (link->iftype == ARPHRD_CAN)
494 /* let's shortcut things for CAN which doesn't need most of checks below. */
495 goto ready;
496
497 if (!link->stacked_netdevs_created)
498 return (void) log_link_debug(link, "%s(): stacked netdevs are not created.", __func__);
499
500 if (!link->static_addresses_configured)
501 return (void) log_link_debug(link, "%s(): static addresses are not configured.", __func__);
502
503 if (!link->static_address_labels_configured)
504 return (void) log_link_debug(link, "%s(): static address labels are not configured.", __func__);
505
506 if (!link->static_bridge_fdb_configured)
507 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
508
509 if (!link->static_bridge_mdb_configured)
510 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
511
512 if (!link->static_ipv6_proxy_ndp_configured)
513 return (void) log_link_debug(link, "%s(): static IPv6 proxy NDP addresses are not configured.", __func__);
514
515 if (!link->static_neighbors_configured)
516 return (void) log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
517
518 if (!link->static_nexthops_configured)
519 return (void) log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
520
521 if (!link->static_routes_configured)
522 return (void) log_link_debug(link, "%s(): static routes are not configured.", __func__);
523
524 if (!link->static_routing_policy_rules_configured)
525 return (void) log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
526
527 if (!link->sr_iov_configured)
528 return (void) log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
529
530 /* IPv6LL is assigned after the link gains its carrier. */
531 if (!link->network->configure_without_carrier &&
532 link_ipv6ll_enabled(link) &&
533 !in6_addr_is_set(&link->ipv6ll_address))
534 return (void) log_link_debug(link, "%s(): IPv6LL is not configured yet.", __func__);
535
536 /* All static addresses must be ready. */
537 bool has_static_address = false;
538 SET_FOREACH(a, link->addresses) {
539 if (a->source != NETWORK_CONFIG_SOURCE_STATIC)
540 continue;
541 if (!address_is_ready(a))
542 return (void) log_link_debug(link, "%s(): static address %s is not ready.", __func__,
543 IN_ADDR_PREFIX_TO_STRING(a->family, &a->in_addr, a->prefixlen));
544 has_static_address = true;
545 }
546
547 /* If at least one static address is requested, do not request that dynamic addressing protocols are finished. */
548 if (has_static_address)
549 goto ready;
550
551 /* If no dynamic addressing protocol enabled, assume the interface is ready.
552 * Note, ignore NDisc when ConfigureWithoutCarrier= is enabled, as IPv6AcceptRA= is enabled by default. */
553 if (!link_ipv4ll_enabled(link) && !link_dhcp4_enabled(link) &&
554 !link_dhcp6_enabled(link) && !link_dhcp_pd_is_enabled(link) &&
555 (link->network->configure_without_carrier || !link_ndisc_enabled(link)))
556 goto ready;
557
558 bool ipv4ll_ready =
559 link_ipv4ll_enabled(link) && link->ipv4ll_address_configured &&
560 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_IPV4LL);
561 bool dhcp4_ready =
562 link_dhcp4_enabled(link) && link->dhcp4_configured &&
563 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP4);
564 bool dhcp6_ready =
565 link_dhcp6_enabled(link) && link->dhcp6_configured &&
566 (!link->network->dhcp6_use_address ||
567 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP6));
568 bool dhcp_pd_ready =
569 link_dhcp_pd_is_enabled(link) && link->dhcp_pd_configured &&
570 (!link->network->dhcp_pd_assign ||
571 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP_PD));
572 bool ndisc_ready =
573 link_ndisc_enabled(link) && link->ndisc_configured &&
574 (!link->network->ndisc_use_autonomous_prefix ||
575 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_NDISC));
576
577 /* If the uplink for PD is self, then request the corresponding DHCP protocol is also ready. */
578 if (dhcp_pd_is_uplink(link, link, /* accept_auto = */ false)) {
579 if (link_dhcp4_enabled(link) && link->network->dhcp_use_6rd &&
580 sd_dhcp_lease_has_6rd(link->dhcp_lease)) {
581 if (!link->dhcp4_configured)
582 return (void) log_link_debug(link, "%s(): DHCPv4 6rd prefix is assigned, but DHCPv4 protocol is not finished yet.", __func__);
583 if (!dhcp_pd_ready)
584 return (void) log_link_debug(link, "%s(): DHCPv4 is finished, but prefix acquired by DHCPv4-6rd is not assigned yet.", __func__);
585 }
586
587 if (link_dhcp6_enabled(link) && link->network->dhcp6_use_pd_prefix &&
588 sd_dhcp6_lease_has_pd_prefix(link->dhcp6_lease)) {
589 if (!link->dhcp6_configured)
590 return (void) log_link_debug(link, "%s(): DHCPv6 IA_PD prefix is assigned, but DHCPv6 protocol is not finished yet.", __func__);
591 if (!dhcp_pd_ready)
592 return (void) log_link_debug(link, "%s(): DHCPv6 is finished, but prefix acquired by DHCPv6 IA_PD is not assigned yet.", __func__);
593 }
594 }
595
596 /* At least one dynamic addressing protocol is finished. */
597 if (!ipv4ll_ready && !dhcp4_ready && !dhcp6_ready && !dhcp_pd_ready && !ndisc_ready)
598 return (void) log_link_debug(link, "%s(): dynamic addressing protocols are enabled but none of them finished yet.", __func__);
599
600 log_link_debug(link, "%s(): IPv4LL:%s DHCPv4:%s DHCPv6:%s DHCP-PD:%s NDisc:%s",
601 __func__,
602 yes_no(ipv4ll_ready),
603 yes_no(dhcp4_ready),
604 yes_no(dhcp6_ready),
605 yes_no(dhcp_pd_ready),
606 yes_no(ndisc_ready));
607
608 ready:
609 link_set_state(link, LINK_STATE_CONFIGURED);
610 }
611
612 static int link_request_static_configs(Link *link) {
613 int r;
614
615 assert(link);
616 assert(link->network);
617 assert(link->state != _LINK_STATE_INVALID);
618
619 r = link_request_static_addresses(link);
620 if (r < 0)
621 return r;
622
623 r = link_request_static_address_labels(link);
624 if (r < 0)
625 return r;
626
627 r = link_request_static_bridge_fdb(link);
628 if (r < 0)
629 return r;
630
631 r = link_request_static_bridge_mdb(link);
632 if (r < 0)
633 return r;
634
635 r = link_request_static_ipv6_proxy_ndp_addresses(link);
636 if (r < 0)
637 return r;
638
639 r = link_request_static_neighbors(link);
640 if (r < 0)
641 return r;
642
643 r = link_request_static_nexthops(link, false);
644 if (r < 0)
645 return r;
646
647 r = link_request_static_routes(link, false);
648 if (r < 0)
649 return r;
650
651 r = link_request_static_routing_policy_rules(link);
652 if (r < 0)
653 return r;
654
655 return 0;
656 }
657
658 int link_request_stacked_netdevs(Link *link, NetDevLocalAddressType type) {
659 NetDev *netdev;
660 int r;
661
662 assert(link);
663
664 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
665 return 0;
666
667 assert(link->network);
668
669 link->stacked_netdevs_created = false;
670
671 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) {
672 if (!netdev_needs_reconfigure(netdev, type))
673 continue;
674
675 r = link_request_stacked_netdev(link, netdev);
676 if (r < 0)
677 return r;
678 }
679
680 if (link->create_stacked_netdev_messages == 0) {
681 link->stacked_netdevs_created = true;
682 link_check_ready(link);
683 }
684
685 return 0;
686 }
687
688 static int link_acquire_dynamic_ipv6_conf(Link *link) {
689 int r;
690
691 assert(link);
692
693 r = radv_start(link);
694 if (r < 0)
695 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Advertisement engine: %m");
696
697 r = ndisc_start(link);
698 if (r < 0)
699 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Discovery: %m");
700
701 r = dhcp6_start(link);
702 if (r < 0)
703 return log_link_warning_errno(link, r, "Failed to start DHCPv6 client: %m");
704
705 return 0;
706 }
707
708 static int link_acquire_dynamic_ipv4_conf(Link *link) {
709 int r;
710
711 assert(link);
712 assert(link->manager);
713 assert(link->manager->event);
714
715 if (link->dhcp_client) {
716 r = dhcp4_start(link);
717 if (r < 0)
718 return log_link_warning_errno(link, r, "Failed to start DHCPv4 client: %m");
719
720 log_link_debug(link, "Acquiring DHCPv4 lease.");
721
722 } else if (link->ipv4ll) {
723 if (in4_addr_is_set(&link->network->ipv4ll_start_address)) {
724 r = sd_ipv4ll_set_address(link->ipv4ll, &link->network->ipv4ll_start_address);
725 if (r < 0)
726 return log_link_warning_errno(link, r, "Could not set IPv4 link-local start address: %m");
727 }
728
729 r = ipv4ll_start(link);
730 if (r < 0)
731 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
732 if (r > 0)
733 log_link_debug(link, "Acquiring IPv4 link-local address.");
734 }
735
736 r = link_start_dhcp4_server(link);
737 if (r < 0)
738 return log_link_warning_errno(link, r, "Could not start DHCP server: %m");
739
740 r = ipv4acd_start(link);
741 if (r < 0)
742 return log_link_warning_errno(link, r, "Could not start IPv4 ACD client: %m");
743
744 return 0;
745 }
746
747 static int link_acquire_dynamic_conf(Link *link) {
748 int r;
749
750 assert(link);
751 assert(link->network);
752
753 r = link_acquire_dynamic_ipv4_conf(link);
754 if (r < 0)
755 return r;
756
757 if (in6_addr_is_set(&link->ipv6ll_address)) {
758 r = link_acquire_dynamic_ipv6_conf(link);
759 if (r < 0)
760 return r;
761 }
762
763 if (!link_radv_enabled(link) || !link->network->dhcp_pd_announce) {
764 /* DHCPv6PD downstream does not require IPv6LL address. But may require RADV to be
765 * configured, and RADV may not be configured yet here. Only acquire subnet prefix when
766 * RADV is disabled, or the announcement of the prefix is disabled. Otherwise, the
767 * below will be called in radv_start(). */
768 r = dhcp_request_prefix_delegation(link);
769 if (r < 0)
770 return log_link_warning_errno(link, r, "Failed to request DHCP delegated subnet prefix: %m");
771 }
772
773 if (link->lldp_tx) {
774 r = sd_lldp_tx_start(link->lldp_tx);
775 if (r < 0)
776 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
777 }
778
779 if (link->lldp_rx) {
780 r = sd_lldp_rx_start(link->lldp_rx);
781 if (r < 0)
782 return log_link_warning_errno(link, r, "Failed to start LLDP client: %m");
783 }
784
785 return 0;
786 }
787
788 int link_ipv6ll_gained(Link *link) {
789 int r;
790
791 assert(link);
792
793 log_link_info(link, "Gained IPv6LL");
794
795 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
796 return 0;
797
798 r = link_acquire_dynamic_ipv6_conf(link);
799 if (r < 0)
800 return r;
801
802 r = link_request_stacked_netdevs(link, NETDEV_LOCAL_ADDRESS_IPV6LL);
803 if (r < 0)
804 return r;
805
806 link_check_ready(link);
807 return 0;
808 }
809
810 int link_handle_bound_to_list(Link *link) {
811 bool required_up = false;
812 bool link_is_up = false;
813 Link *l;
814
815 assert(link);
816
817 /* If at least one interface in bound_to_links has carrier, then make this interface up.
818 * If all interfaces in bound_to_links do not, then make this interface down. */
819
820 if (hashmap_isempty(link->bound_to_links))
821 return 0;
822
823 if (link->flags & IFF_UP)
824 link_is_up = true;
825
826 HASHMAP_FOREACH(l, link->bound_to_links)
827 if (link_has_carrier(l)) {
828 required_up = true;
829 break;
830 }
831
832 if (!required_up && link_is_up)
833 return link_request_to_bring_up_or_down(link, /* up = */ false);
834 if (required_up && !link_is_up)
835 return link_request_to_bring_up_or_down(link, /* up = */ true);
836
837 return 0;
838 }
839
840 static int link_handle_bound_by_list(Link *link) {
841 Link *l;
842 int r;
843
844 assert(link);
845
846 /* Update up or down state of interfaces which depend on this interface's carrier state. */
847
848 HASHMAP_FOREACH(l, link->bound_by_links) {
849 r = link_handle_bound_to_list(l);
850 if (r < 0)
851 return r;
852 }
853
854 return 0;
855 }
856
857 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
858 int r;
859
860 assert(link);
861 assert(carrier);
862
863 if (link == carrier)
864 return 0;
865
866 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
867 return 0;
868
869 r = hashmap_ensure_put(h, NULL, INT_TO_PTR(carrier->ifindex), carrier);
870 if (r < 0)
871 return r;
872
873 link_dirty(link);
874
875 return 0;
876 }
877
878 static int link_new_bound_by_list(Link *link) {
879 Manager *m;
880 Link *carrier;
881 int r;
882
883 assert(link);
884 assert(link->manager);
885
886 m = link->manager;
887
888 HASHMAP_FOREACH(carrier, m->links_by_index) {
889 if (!carrier->network)
890 continue;
891
892 if (strv_isempty(carrier->network->bind_carrier))
893 continue;
894
895 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
896 r = link_put_carrier(link, carrier, &link->bound_by_links);
897 if (r < 0)
898 return r;
899 }
900 }
901
902 HASHMAP_FOREACH(carrier, link->bound_by_links) {
903 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
904 if (r < 0)
905 return r;
906 }
907
908 return 0;
909 }
910
911 static int link_new_bound_to_list(Link *link) {
912 Manager *m;
913 Link *carrier;
914 int r;
915
916 assert(link);
917 assert(link->manager);
918
919 if (!link->network)
920 return 0;
921
922 if (strv_isempty(link->network->bind_carrier))
923 return 0;
924
925 m = link->manager;
926
927 HASHMAP_FOREACH(carrier, m->links_by_index) {
928 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
929 r = link_put_carrier(link, carrier, &link->bound_to_links);
930 if (r < 0)
931 return r;
932 }
933 }
934
935 HASHMAP_FOREACH(carrier, link->bound_to_links) {
936 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
937 if (r < 0)
938 return r;
939 }
940
941 return 0;
942 }
943
944 static void link_free_bound_to_list(Link *link) {
945 bool updated = false;
946 Link *bound_to;
947
948 assert(link);
949
950 while ((bound_to = hashmap_steal_first(link->bound_to_links))) {
951 updated = true;
952
953 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
954 link_dirty(bound_to);
955 }
956
957 if (updated)
958 link_dirty(link);
959 }
960
961 static void link_free_bound_by_list(Link *link) {
962 bool updated = false;
963 Link *bound_by;
964
965 assert(link);
966
967 while ((bound_by = hashmap_steal_first(link->bound_by_links))) {
968 updated = true;
969
970 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
971 link_dirty(bound_by);
972 link_handle_bound_to_list(bound_by);
973 }
974 }
975
976 if (updated)
977 link_dirty(link);
978 }
979
980 static int link_append_to_master(Link *link) {
981 Link *master;
982 int r;
983
984 assert(link);
985
986 /* - The link may have no master.
987 * - RTM_NEWLINK message about master interface may not be received yet. */
988 if (link_get_master(link, &master) < 0)
989 return 0;
990
991 r = set_ensure_put(&master->slaves, &link_hash_ops, link);
992 if (r <= 0)
993 return r;
994
995 link_ref(link);
996 return 0;
997 }
998
999 static void link_drop_from_master(Link *link) {
1000 Link *master;
1001
1002 assert(link);
1003
1004 if (!link->manager)
1005 return;
1006
1007 if (link_get_master(link, &master) < 0)
1008 return;
1009
1010 link_unref(set_remove(master->slaves, link));
1011 }
1012
1013 static int link_drop_requests(Link *link) {
1014 Request *req;
1015 int ret = 0;
1016
1017 assert(link);
1018 assert(link->manager);
1019
1020 ORDERED_SET_FOREACH(req, link->manager->request_queue) {
1021 if (req->link != link)
1022 continue;
1023
1024 /* If the request is already called, but its reply is not received, then we need to
1025 * drop the configuration (e.g. address) here. Note, if the configuration is known,
1026 * it will be handled later by link_drop_unmanaged_addresses() or so. */
1027 if (req->waiting_reply && link->state != LINK_STATE_LINGER)
1028 switch (req->type) {
1029 case REQUEST_TYPE_ADDRESS: {
1030 Address *address = ASSERT_PTR(req->userdata);
1031
1032 if (address_get(link, address, NULL) < 0)
1033 RET_GATHER(ret, address_remove(address, link));
1034 break;
1035 }
1036 case REQUEST_TYPE_NEIGHBOR: {
1037 Neighbor *neighbor = ASSERT_PTR(req->userdata);
1038
1039 if (neighbor_get(link, neighbor, NULL) < 0)
1040 RET_GATHER(ret, neighbor_remove(neighbor, link));
1041 break;
1042 }
1043 case REQUEST_TYPE_NEXTHOP: {
1044 NextHop *nexthop = ASSERT_PTR(req->userdata);
1045
1046 if (nexthop_get_by_id(link->manager, nexthop->id, NULL) < 0)
1047 RET_GATHER(ret, nexthop_remove(nexthop, link->manager));
1048 break;
1049 }
1050 case REQUEST_TYPE_ROUTE: {
1051 Route *route = ASSERT_PTR(req->userdata);
1052
1053 if (route_get(link->manager, route, NULL) < 0)
1054 RET_GATHER(ret, route_remove(route, link->manager));
1055 break;
1056 }
1057 default:
1058 ;
1059 }
1060
1061 request_detach(req);
1062 }
1063
1064 return ret;
1065 }
1066
1067 static Link *link_drop(Link *link) {
1068 if (!link)
1069 return NULL;
1070
1071 assert(link->manager);
1072
1073 link_set_state(link, LINK_STATE_LINGER);
1074
1075 /* Drop all references from other links and manager. Note that async netlink calls may have
1076 * references to the link, and they will be dropped when we receive replies. */
1077
1078 (void) link_drop_requests(link);
1079
1080 link_free_bound_to_list(link);
1081 link_free_bound_by_list(link);
1082
1083 link_clear_sr_iov_ifindices(link);
1084
1085 link_drop_from_master(link);
1086
1087 if (link->state_file)
1088 (void) unlink(link->state_file);
1089
1090 link_clean(link);
1091
1092 STRV_FOREACH(n, link->alternative_names)
1093 hashmap_remove(link->manager->links_by_name, *n);
1094 hashmap_remove(link->manager->links_by_name, link->ifname);
1095
1096 /* bonding master and its slaves have the same hardware address. */
1097 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
1098
1099 /* The following must be called at last. */
1100 assert_se(hashmap_remove(link->manager->links_by_index, INT_TO_PTR(link->ifindex)) == link);
1101 return link_unref(link);
1102 }
1103
1104 static int link_drop_unmanaged_config(Link *link) {
1105 int r;
1106
1107 assert(link);
1108 assert(link->state == LINK_STATE_CONFIGURING);
1109 assert(link->manager);
1110
1111 r = link_drop_unmanaged_routes(link);
1112 RET_GATHER(r, link_drop_unmanaged_nexthops(link));
1113 RET_GATHER(r, link_drop_unmanaged_addresses(link));
1114 RET_GATHER(r, link_drop_unmanaged_neighbors(link));
1115 RET_GATHER(r, link_drop_unmanaged_routing_policy_rules(link));
1116
1117 return r;
1118 }
1119
1120 static int link_drop_static_config(Link *link) {
1121 int r;
1122
1123 assert(link);
1124 assert(link->manager);
1125
1126 r = link_drop_static_routes(link);
1127 RET_GATHER(r, link_drop_static_nexthops(link));
1128 RET_GATHER(r, link_drop_static_addresses(link));
1129 RET_GATHER(r, link_drop_static_neighbors(link));
1130 RET_GATHER(r, link_drop_static_routing_policy_rules(link));
1131
1132 return r;
1133 }
1134
1135 static int link_drop_dynamic_config(Link *link, Network *network) {
1136 int r;
1137
1138 assert(link);
1139 assert(link->network);
1140
1141 /* Drop unnecessary dynamic configurations gracefully, e.g. drop DHCP lease in the case that
1142 * previously DHCP=yes and now DHCP=no, but keep DHCP lease when DHCP setting is unchanged. */
1143
1144 r = link_drop_ndisc_config(link, network);
1145 RET_GATHER(r, link_drop_radv_config(link, network)); /* Stop before dropping DHCP-PD prefixes. */
1146 RET_GATHER(r, link_drop_ipv4ll_config(link, network)); /* Stop before DHCPv4 client. */
1147 RET_GATHER(r, link_drop_dhcp4_config(link, network));
1148 RET_GATHER(r, link_drop_dhcp6_config(link, network));
1149 RET_GATHER(r, link_drop_dhcp_pd_config(link, network));
1150 link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
1151 link->lldp_rx = sd_lldp_rx_unref(link->lldp_rx); /* TODO: keep the received neighbors. */
1152 link->lldp_tx = sd_lldp_tx_unref(link->lldp_tx);
1153
1154 /* Even if we do not release DHCP lease or so, reset 'configured' flags. Otherwise, e.g. if
1155 * previously UseDNS= was disabled but is now enabled, link will enter configured state before
1156 * expected DNS servers being acquired. */
1157 link->ipv4ll_address_configured = false;
1158 link->dhcp4_configured = false;
1159 link->dhcp6_configured = false;
1160 link->dhcp_pd_configured = false;
1161 link->ndisc_configured = false;
1162
1163 return r;
1164 }
1165
1166 static int link_configure(Link *link) {
1167 int r;
1168
1169 assert(link);
1170 assert(link->network);
1171 assert(link->state == LINK_STATE_INITIALIZED);
1172
1173 link_set_state(link, LINK_STATE_CONFIGURING);
1174
1175 r = link_drop_unmanaged_config(link);
1176 if (r < 0)
1177 return r;
1178
1179 r = link_new_bound_to_list(link);
1180 if (r < 0)
1181 return r;
1182
1183 r = link_request_traffic_control(link);
1184 if (r < 0)
1185 return r;
1186
1187 r = link_configure_mtu(link);
1188 if (r < 0)
1189 return r;
1190
1191 if (link->iftype == ARPHRD_CAN) {
1192 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1193 r = link_request_to_set_can(link);
1194 if (r < 0)
1195 return r;
1196
1197 return link_request_to_activate(link);
1198 }
1199
1200 r = link_request_sr_iov_vfs(link);
1201 if (r < 0)
1202 return r;
1203
1204 r = link_set_sysctl(link);
1205 if (r < 0)
1206 return r;
1207
1208 r = link_request_to_set_mac(link, /* allow_retry = */ true);
1209 if (r < 0)
1210 return r;
1211
1212 r = link_request_to_set_ipoib(link);
1213 if (r < 0)
1214 return r;
1215
1216 r = link_request_to_set_flags(link);
1217 if (r < 0)
1218 return r;
1219
1220 r = link_request_to_set_group(link);
1221 if (r < 0)
1222 return r;
1223
1224 r = link_request_to_set_addrgen_mode(link);
1225 if (r < 0)
1226 return r;
1227
1228 r = link_request_to_set_master(link);
1229 if (r < 0)
1230 return r;
1231
1232 r = link_request_stacked_netdevs(link, _NETDEV_LOCAL_ADDRESS_TYPE_INVALID);
1233 if (r < 0)
1234 return r;
1235
1236 r = link_request_to_set_bond(link);
1237 if (r < 0)
1238 return r;
1239
1240 r = link_request_to_set_bridge(link);
1241 if (r < 0)
1242 return r;
1243
1244 r = link_request_to_set_bridge_vlan(link);
1245 if (r < 0)
1246 return r;
1247
1248 r = link_request_to_activate(link);
1249 if (r < 0)
1250 return r;
1251
1252 r = ipv4ll_configure(link);
1253 if (r < 0)
1254 return r;
1255
1256 r = link_request_dhcp4_client(link);
1257 if (r < 0)
1258 return r;
1259
1260 r = link_request_dhcp6_client(link);
1261 if (r < 0)
1262 return r;
1263
1264 r = link_request_ndisc(link);
1265 if (r < 0)
1266 return r;
1267
1268 r = link_request_dhcp_server(link);
1269 if (r < 0)
1270 return r;
1271
1272 r = link_request_radv(link);
1273 if (r < 0)
1274 return r;
1275
1276 r = link_lldp_rx_configure(link);
1277 if (r < 0)
1278 return r;
1279
1280 r = link_lldp_tx_configure(link);
1281 if (r < 0)
1282 return r;
1283
1284 r = link_request_static_configs(link);
1285 if (r < 0)
1286 return r;
1287
1288 if (!link_has_carrier(link))
1289 return 0;
1290
1291 return link_acquire_dynamic_conf(link);
1292 }
1293
1294 static int link_get_network(Link *link, Network **ret) {
1295 Network *network;
1296 int r;
1297
1298 assert(link);
1299 assert(link->manager);
1300 assert(ret);
1301
1302 ORDERED_HASHMAP_FOREACH(network, link->manager->networks) {
1303 bool warn = false;
1304
1305 r = net_match_config(
1306 &network->match,
1307 link->dev,
1308 &link->hw_addr,
1309 &link->permanent_hw_addr,
1310 link->driver,
1311 link->iftype,
1312 link->kind,
1313 link->ifname,
1314 link->alternative_names,
1315 link->wlan_iftype,
1316 link->ssid,
1317 &link->bssid);
1318 if (r < 0)
1319 return r;
1320 if (r == 0)
1321 continue;
1322
1323 if (network->match.ifname && link->dev) {
1324 uint8_t name_assign_type = NET_NAME_UNKNOWN;
1325 const char *attr;
1326
1327 if (sd_device_get_sysattr_value(link->dev, "name_assign_type", &attr) >= 0)
1328 (void) safe_atou8(attr, &name_assign_type);
1329
1330 warn = name_assign_type == NET_NAME_ENUM;
1331 }
1332
1333 log_link_full(link, warn ? LOG_WARNING : LOG_DEBUG,
1334 "Found matching .network file%s: %s",
1335 warn ? ", based on potentially unpredictable interface name" : "",
1336 network->filename);
1337
1338 if (network->unmanaged)
1339 return -ENOENT;
1340
1341 *ret = network;
1342 return 0;
1343 }
1344
1345 return log_link_debug_errno(link, SYNTHETIC_ERRNO(ENOENT), "No matching .network found.");
1346 }
1347
1348 static void link_enter_unmanaged(Link *link) {
1349 assert(link);
1350
1351 if (link->state == LINK_STATE_UNMANAGED)
1352 return;
1353
1354 log_link_full(link, link->state == LINK_STATE_INITIALIZED ? LOG_DEBUG : LOG_INFO,
1355 "Unmanaging interface.");
1356
1357 (void) link_stop_engines(link, /* may_keep_dynamic = */ false);
1358 (void) link_drop_requests(link);
1359 (void) link_drop_static_config(link);
1360
1361 /* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the
1362 * bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will
1363 * not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the
1364 * map here, as it depends on .network files assigned to other links. */
1365 link_free_bound_to_list(link);
1366 link_free_engines(link);
1367
1368 link->network = network_unref(link->network);
1369 link_set_state(link, LINK_STATE_UNMANAGED);
1370 }
1371
1372 static int link_managed_by_us(Link *link) {
1373 int r;
1374
1375 assert(link);
1376
1377 if (!link->dev)
1378 return true;
1379
1380 const char *s;
1381 r = sd_device_get_property_value(link->dev, "ID_NET_MANAGED_BY", &s);
1382 if (r == -ENOENT)
1383 return true;
1384 if (r < 0)
1385 return log_link_warning_errno(link, r, "Failed to get ID_NET_MANAGED_BY udev property: %m");
1386
1387 if (streq(s, "io.systemd.Network"))
1388 return true;
1389
1390 if (link->state == LINK_STATE_UNMANAGED)
1391 return false; /* Already in unmanaged state */
1392
1393 log_link_debug(link, "Interface is requested to be managed by '%s', unmanaging the interface.", s);
1394 link_set_state(link, LINK_STATE_UNMANAGED);
1395 return false;
1396 }
1397
1398 int link_reconfigure_impl(Link *link, LinkReconfigurationFlag flags) {
1399 Network *network = NULL;
1400 int r;
1401
1402 assert(link);
1403 assert(link->manager);
1404
1405 link_assign_netdev(link);
1406
1407 if (link->manager->state != MANAGER_RUNNING)
1408 return 0;
1409
1410 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
1411 return 0;
1412
1413 r = link_managed_by_us(link);
1414 if (r <= 0)
1415 return r;
1416
1417 r = link_get_network(link, &network);
1418 if (r == -ENOENT) {
1419 link_enter_unmanaged(link);
1420 return 0;
1421 }
1422 if (r < 0)
1423 return r;
1424
1425 if (link->network == network && !FLAGS_SET(flags, LINK_RECONFIGURE_UNCONDITIONALLY))
1426 return 0;
1427
1428 _cleanup_free_ char *joined = strv_join(network->dropins, ", ");
1429 if (link->network)
1430 log_link_info(link, "Reconfiguring with %s%s%s%s.",
1431 network->filename,
1432 isempty(joined) ? "" : " (dropins: ",
1433 joined,
1434 isempty(joined) ? "" : ")");
1435 else
1436 log_link_info(link, "Configuring with %s%s%s%s.",
1437 network->filename,
1438 isempty(joined) ? "" : " (dropins: ",
1439 joined,
1440 isempty(joined) ? "" : ")");
1441
1442 /* Dropping configurations based on the old .network file. */
1443 r = link_drop_requests(link);
1444 if (r < 0)
1445 return r;
1446
1447 /* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the
1448 * bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will
1449 * not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the
1450 * map here, as it depends on .network files assigned to other links. */
1451 link_free_bound_to_list(link);
1452
1453 _cleanup_(network_unrefp) Network *old_network = TAKE_PTR(link->network);
1454
1455 /* Then, apply new .network file */
1456 link->network = network_ref(network);
1457
1458 if (FLAGS_SET(network->keep_configuration, KEEP_CONFIGURATION_DYNAMIC) ||
1459 !FLAGS_SET(flags, LINK_RECONFIGURE_CLEANLY)) {
1460 /* To make 'networkctl reconfigure INTERFACE' work safely for an interface whose new .network
1461 * file has KeepConfiguration=dynamic or yes, even if a clean reconfiguration is requested,
1462 * drop only unnecessary or possibly being changed dynamic configurations here. */
1463 r = link_drop_dynamic_config(link, old_network);
1464 if (r < 0)
1465 return r;
1466 } else {
1467 /* Otherwise, stop DHCP client and friends unconditionally, and drop all dynamic
1468 * configurations like DHCP address and routes. */
1469 r = link_stop_engines(link, /* may_keep_dynamic = */ false);
1470 if (r < 0)
1471 return r;
1472
1473 /* Free DHCP client and friends. */
1474 link_free_engines(link);
1475 }
1476
1477 link_update_operstate(link, true);
1478 link_dirty(link);
1479
1480 link_set_state(link, LINK_STATE_INITIALIZED);
1481 link->activated = false;
1482
1483 r = link_configure(link);
1484 if (r < 0)
1485 return r;
1486
1487 return 1;
1488 }
1489
1490 typedef struct LinkReconfigurationData {
1491 Manager *manager;
1492 Link *link;
1493 LinkReconfigurationFlag flags;
1494 sd_bus_message *message;
1495 unsigned *counter;
1496 } LinkReconfigurationData;
1497
1498 static LinkReconfigurationData* link_reconfiguration_data_free(LinkReconfigurationData *data) {
1499 if (!data)
1500 return NULL;
1501
1502 link_unref(data->link);
1503 sd_bus_message_unref(data->message);
1504
1505 return mfree(data);
1506 }
1507
1508 DEFINE_TRIVIAL_CLEANUP_FUNC(LinkReconfigurationData*, link_reconfiguration_data_free);
1509
1510 static void link_reconfiguration_data_destroy_callback(LinkReconfigurationData *data) {
1511 int r;
1512
1513 assert(data);
1514
1515 if (data->message) {
1516 if (data->counter) {
1517 assert(*data->counter > 0);
1518 (*data->counter)--;
1519 }
1520
1521 if (!data->counter || *data->counter <= 0) {
1522 /* Update the state files before replying the bus method. Otherwise,
1523 * systemd-networkd-wait-online following networkctl reload/reconfigure may read an
1524 * outdated state file and wrongly handle an interface is already in the configured
1525 * state. */
1526 (void) manager_clean_all(data->manager);
1527
1528 r = sd_bus_reply_method_return(data->message, NULL);
1529 if (r < 0)
1530 log_warning_errno(r, "Failed to reply for DBus method, ignoring: %m");
1531 }
1532 }
1533
1534 link_reconfiguration_data_free(data);
1535 }
1536
1537 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, LinkReconfigurationData *data) {
1538 Link *link = ASSERT_PTR(ASSERT_PTR(data)->link);
1539 int r;
1540
1541 r = link_getlink_handler_internal(rtnl, m, link, "Failed to update link state");
1542 if (r <= 0)
1543 return r;
1544
1545 r = link_reconfigure_impl(link, data->flags);
1546 if (r < 0) {
1547 link_enter_failed(link);
1548 return 0;
1549 }
1550
1551 return r;
1552 }
1553
1554 int link_reconfigure_full(Link *link, LinkReconfigurationFlag flags, sd_bus_message *message, unsigned *counter) {
1555 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1556 _cleanup_(link_reconfiguration_data_freep) LinkReconfigurationData *data = NULL;
1557 int r;
1558
1559 assert(link);
1560 assert(link->manager);
1561 assert(link->manager->rtnl);
1562
1563 /* When the link is in the pending or initialized state, link_reconfigure_impl() will be called later
1564 * by link_initialized() or link_initialized_and_synced(). To prevent the function from being called
1565 * multiple times simultaneously, let's refuse to reconfigure the interface here in such cases. */
1566 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
1567 return 0; /* 0 means no-op. */
1568
1569 data = new(LinkReconfigurationData, 1);
1570 if (!data) {
1571 r = -ENOMEM;
1572 goto failed;
1573 }
1574
1575 *data = (LinkReconfigurationData) {
1576 .manager = link->manager,
1577 .link = link_ref(link),
1578 .flags = flags,
1579 .message = sd_bus_message_ref(message), /* message may be NULL, but _ref() works fine. */
1580 .counter = counter,
1581 };
1582
1583 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
1584 if (r < 0)
1585 goto failed;
1586
1587 r = netlink_call_async(link->manager->rtnl, NULL, req,
1588 link_reconfigure_handler,
1589 link_reconfiguration_data_destroy_callback, data);
1590 if (r < 0)
1591 goto failed;
1592
1593 TAKE_PTR(data);
1594 if (counter)
1595 (*counter)++;
1596
1597 if (link->state == LINK_STATE_FAILED)
1598 link_set_state(link, LINK_STATE_INITIALIZED);
1599
1600 return 1; /* 1 means the interface will be reconfigured, and bus method will be replied later. */
1601
1602 failed:
1603 log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
1604 link_enter_failed(link);
1605 return r;
1606 }
1607
1608 static int link_initialized_and_synced(Link *link) {
1609 int r;
1610
1611 assert(link);
1612 assert(link->manager);
1613
1614 if (link->state == LINK_STATE_PENDING) {
1615 log_link_debug(link, "Link state is up-to-date");
1616 link_set_state(link, LINK_STATE_INITIALIZED);
1617
1618 r = link_new_bound_by_list(link);
1619 if (r < 0)
1620 return r;
1621
1622 r = link_handle_bound_by_list(link);
1623 if (r < 0)
1624 return r;
1625 }
1626
1627 return link_reconfigure_impl(link, /* flags = */ 0);
1628 }
1629
1630 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1631 int r;
1632
1633 r = link_getlink_handler_internal(rtnl, m, link, "Failed to wait for the interface to be initialized");
1634 if (r <= 0)
1635 return r;
1636
1637 r = link_initialized_and_synced(link);
1638 if (r < 0)
1639 link_enter_failed(link);
1640
1641 return 0;
1642 }
1643
1644 static int link_initialized(Link *link, sd_device *device) {
1645 int r;
1646
1647 assert(link);
1648 assert(device);
1649
1650 /* Always replace with the new sd_device object. As the sysname (and possibly other properties
1651 * or sysattrs) may be outdated. */
1652 device_unref_and_replace(link->dev, device);
1653
1654 r = link_managed_by_us(link);
1655 if (r <= 0)
1656 return r;
1657
1658 if (link->dhcp_client) {
1659 r = sd_dhcp_client_attach_device(link->dhcp_client, link->dev);
1660 if (r < 0)
1661 log_link_warning_errno(link, r, "Failed to attach device to DHCPv4 client, ignoring: %m");
1662 }
1663
1664 if (link->dhcp6_client) {
1665 r = sd_dhcp6_client_attach_device(link->dhcp6_client, link->dev);
1666 if (r < 0)
1667 log_link_warning_errno(link, r, "Failed to attach device to DHCPv6 client, ignoring: %m");
1668 }
1669
1670 r = link_set_sr_iov_ifindices(link);
1671 if (r < 0)
1672 log_link_warning_errno(link, r, "Failed to manage SR-IOV PF and VF ports, ignoring: %m");
1673
1674 if (link->state != LINK_STATE_PENDING)
1675 return link_reconfigure(link, /* flags = */ 0);
1676
1677 log_link_debug(link, "udev initialized link");
1678
1679 /* udev has initialized the link, but we don't know if we have yet
1680 * processed the NEWLINK messages with the latest state. Do a GETLINK,
1681 * when it returns we know that the pending NEWLINKs have already been
1682 * processed and that we are up-to-date */
1683
1684 return link_call_getlink(link, link_initialized_handler);
1685 }
1686
1687 int link_check_initialized(Link *link) {
1688 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
1689 int r;
1690
1691 assert(link);
1692
1693 if (!udev_available())
1694 return link_initialized_and_synced(link);
1695
1696 /* udev should be around */
1697 r = sd_device_new_from_ifindex(&device, link->ifindex);
1698 if (r < 0) {
1699 log_link_debug_errno(link, r, "Could not find device, waiting for device initialization: %m");
1700 return 0;
1701 }
1702
1703 r = device_is_processed(device);
1704 if (r < 0)
1705 return log_link_warning_errno(link, r, "Could not determine whether the device is processed by udevd: %m");
1706 if (r == 0) {
1707 /* not yet ready */
1708 log_link_debug(link, "link pending udev initialization...");
1709 return 0;
1710 }
1711
1712 r = device_is_renaming(device);
1713 if (r < 0)
1714 return log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
1715 if (r > 0) {
1716 log_link_debug(link, "Interface is being renamed, pending initialization.");
1717 return 0;
1718 }
1719
1720 return link_initialized(link, device);
1721 }
1722
1723 int manager_udev_process_link(Manager *m, sd_device *device, sd_device_action_t action) {
1724 int r, ifindex;
1725 Link *link;
1726
1727 assert(m);
1728 assert(device);
1729
1730 r = sd_device_get_ifindex(device, &ifindex);
1731 if (r < 0)
1732 return log_device_debug_errno(device, r, "Failed to get ifindex: %m");
1733
1734 r = link_get_by_index(m, ifindex, &link);
1735 if (r < 0) {
1736 /* This error is not critical, as the corresponding rtnl message may be received later. */
1737 log_device_debug_errno(device, r, "Failed to get link from ifindex %i, ignoring: %m", ifindex);
1738 return 0;
1739 }
1740
1741 /* Let's unref the sd-device object assigned to the corresponding Link object, but keep the Link
1742 * object here. It will be removed only when rtnetlink says so. */
1743 if (action == SD_DEVICE_REMOVE) {
1744 link->dev = sd_device_unref(link->dev);
1745 return 0;
1746 }
1747
1748 r = device_is_renaming(device);
1749 if (r < 0)
1750 return log_device_debug_errno(device, r, "Failed to determine if the device is renaming or not: %m");
1751 if (r > 0) {
1752 log_device_debug(device, "Device is renaming, waiting for the interface to be renamed.");
1753 /* TODO:
1754 * What happens when a device is initialized, then soon renamed after that? When we detect
1755 * such, maybe we should cancel or postpone all queued requests for the interface. */
1756 return 0;
1757 }
1758
1759 r = link_initialized(link, device);
1760 if (r < 0)
1761 link_enter_failed(link);
1762
1763 return 0;
1764 }
1765
1766 static int link_carrier_gained(Link *link) {
1767 LinkReconfigurationFlag flags = 0;
1768 int r;
1769
1770 assert(link);
1771
1772 log_link_info(link, "Gained carrier");
1773
1774 r = event_source_disable(link->carrier_lost_timer);
1775 if (r < 0)
1776 log_link_warning_errno(link, r, "Failed to disable carrier lost timer, ignoring: %m");
1777
1778 /* Process BindCarrier= setting specified by other interfaces. This is independent of the .network
1779 * file assigned to this interface, but depends on .network files assigned to other interfaces.
1780 * Hence, this can and should be called earlier. */
1781 r = link_handle_bound_by_list(link);
1782 if (r < 0)
1783 return r;
1784
1785 /* If a wireless interface was connected to an access point, and the SSID is changed (that is,
1786 * both previous_ssid and ssid are non-NULL), then the connected wireless network could be
1787 * changed. So, always reconfigure the link. Which means e.g. the DHCP client will be
1788 * restarted, and the correct network information will be gained.
1789 *
1790 * However, do not reconfigure the wireless interface forcibly if it was not connected to any
1791 * access points previously (previous_ssid is NULL in this case). As, a .network file may be
1792 * already assigned to the interface (in that case, the .network file does not have the SSID=
1793 * setting in the [Match] section), and the interface is already being configured. Of course,
1794 * there may exist another .network file with higher priority and a matching SSID= setting. But
1795 * in that case, link_reconfigure_impl() can handle that without any flags.
1796 *
1797 * For non-wireless interfaces, we have no way to detect the connected network change. So,
1798 * we do not set any flags here. Note, both ssid and previous_ssid are NULL in that case. */
1799 if (link->previous_ssid && !streq_ptr(link->previous_ssid, link->ssid))
1800 flags |= LINK_RECONFIGURE_UNCONDITIONALLY | LINK_RECONFIGURE_CLEANLY;
1801 link->previous_ssid = mfree(link->previous_ssid);
1802
1803 /* AP and P2P-GO interfaces may have a new SSID - update the link properties in case a new .network
1804 * profile wants to match on it with SSID= in its [Match] section.
1805 */
1806 if (IN_SET(link->wlan_iftype, NL80211_IFTYPE_AP, NL80211_IFTYPE_P2P_GO)) {
1807 r = link_get_wlan_interface(link);
1808 if (r < 0)
1809 return r;
1810 }
1811
1812 /* At this stage, both wlan and link information should be up-to-date. Hence, it is not necessary to
1813 * call RTM_GETLINK, NL80211_CMD_GET_INTERFACE, or NL80211_CMD_GET_STATION commands, and simply call
1814 * link_reconfigure_impl(). Note, link_reconfigure_impl() returns 1 when the link is reconfigured. */
1815 r = link_reconfigure_impl(link, flags);
1816 if (r != 0)
1817 return r;
1818
1819 if (link->iftype == ARPHRD_CAN)
1820 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1821 return 0;
1822
1823 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
1824 r = link_acquire_dynamic_conf(link);
1825 if (r < 0)
1826 return r;
1827
1828 r = link_request_static_configs(link);
1829 if (r < 0)
1830 return r;
1831 }
1832
1833 return 0;
1834 }
1835
1836 static int link_carrier_lost_impl(Link *link) {
1837 int ret = 0;
1838
1839 assert(link);
1840
1841 link->previous_ssid = mfree(link->previous_ssid);
1842
1843 ret = link_handle_bound_by_list(link);
1844
1845 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1846 return ret;
1847
1848 if (!link->network)
1849 return ret;
1850
1851 RET_GATHER(ret, link_stop_engines(link, /* may_keep_dynamic = */ false));
1852 RET_GATHER(ret, link_drop_static_config(link));
1853
1854 return ret;
1855 }
1856
1857 static int link_carrier_lost_handler(sd_event_source *s, uint64_t usec, void *userdata) {
1858 Link *link = ASSERT_PTR(userdata);
1859 int r;
1860
1861 r = link_carrier_lost_impl(link);
1862 if (r < 0) {
1863 log_link_warning_errno(link, r, "Failed to process carrier lost event: %m");
1864 link_enter_failed(link);
1865 }
1866
1867 return 0;
1868 }
1869
1870 static int link_carrier_lost(Link *link) {
1871 uint16_t dhcp_mtu;
1872 usec_t usec;
1873
1874 assert(link);
1875
1876 log_link_info(link, "Lost carrier");
1877
1878 if (link->iftype == ARPHRD_CAN)
1879 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1880 usec = 0;
1881
1882 else if (!link->network)
1883 usec = 0;
1884
1885 else if (link->network->ignore_carrier_loss_set)
1886 /* If IgnoreCarrierLoss= is explicitly specified, then use the specified value. */
1887 usec = link->network->ignore_carrier_loss_usec;
1888
1889 else if (link->network->bond && link->wlan_iftype > 0)
1890 /* Enslaving wlan interface to a bond disconnects from the connected AP, and causes its
1891 * carrier to be lost. See #19832. */
1892 usec = 3 * USEC_PER_SEC;
1893
1894 else if (link->network->dhcp_use_mtu &&
1895 link->dhcp_lease &&
1896 sd_dhcp_lease_get_mtu(link->dhcp_lease, &dhcp_mtu) >= 0 &&
1897 dhcp_mtu != link->original_mtu)
1898 /* Some drivers reset interfaces when changing MTU. Resetting interfaces by the static
1899 * MTU should not cause any issues, as MTU is changed only once. However, setting MTU
1900 * through DHCP lease causes an infinite loop of resetting the interface. See #18738. */
1901 usec = 5 * USEC_PER_SEC;
1902
1903 else
1904 /* Otherwise, use the implied default value. */
1905 usec = link->network->ignore_carrier_loss_usec;
1906
1907 if (usec == USEC_INFINITY)
1908 return 0;
1909
1910 if (usec == 0)
1911 return link_carrier_lost_impl(link);
1912
1913 return event_reset_time_relative(link->manager->event,
1914 &link->carrier_lost_timer,
1915 CLOCK_BOOTTIME,
1916 usec,
1917 0,
1918 link_carrier_lost_handler,
1919 link,
1920 0,
1921 "link-carrier-loss",
1922 true);
1923 }
1924
1925 static int link_admin_state_up(Link *link) {
1926 assert(link);
1927
1928 /* This is called every time an interface admin state changes to up;
1929 * specifically, when IFF_UP flag changes from unset to set. */
1930
1931 log_link_info(link, "Link UP");
1932
1933 if (!link->network)
1934 return 0;
1935
1936 if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_DOWN) {
1937 log_link_info(link, "Activation policy is \"always-down\", forcing link down.");
1938 return link_request_to_bring_up_or_down(link, /* up = */ false);
1939 }
1940
1941 /* We set the ipv6 mtu after the device mtu, but the kernel resets
1942 * ipv6 mtu on NETDEV_UP, so we need to reset it. */
1943 (void) link_set_ipv6_mtu(link, LOG_INFO);
1944
1945 return 0;
1946 }
1947
1948 static int link_admin_state_down(Link *link) {
1949 assert(link);
1950
1951 log_link_info(link, "Link DOWN");
1952
1953 link_forget_nexthops(link);
1954 link_forget_routes(link);
1955
1956 if (!link->network)
1957 return 0;
1958
1959 if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) {
1960 log_link_info(link, "Activation policy is \"always-up\", forcing link up.");
1961 return link_request_to_bring_up_or_down(link, /* up = */ true);
1962 }
1963
1964 return 0;
1965 }
1966
1967 static bool link_is_enslaved(Link *link) {
1968 if (link->flags & IFF_SLAVE)
1969 return true;
1970
1971 if (link->master_ifindex > 0)
1972 return true;
1973
1974 return false;
1975 }
1976
1977 void link_update_operstate(Link *link, bool also_update_master) {
1978 LinkOperationalState operstate;
1979 LinkCarrierState carrier_state;
1980 LinkAddressState ipv4_address_state, ipv6_address_state, address_state;
1981 LinkOnlineState online_state;
1982 _cleanup_strv_free_ char **p = NULL;
1983 bool changed = false;
1984
1985 assert(link);
1986
1987 if (link->kernel_operstate == IF_OPER_DORMANT)
1988 carrier_state = LINK_CARRIER_STATE_DORMANT;
1989 else if (link_has_carrier(link)) {
1990 if (link_is_enslaved(link))
1991 carrier_state = LINK_CARRIER_STATE_ENSLAVED;
1992 else
1993 carrier_state = LINK_CARRIER_STATE_CARRIER;
1994 } else if (link->flags & IFF_UP)
1995 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
1996 else
1997 carrier_state = LINK_CARRIER_STATE_OFF;
1998
1999 if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
2000 Link *slave;
2001
2002 SET_FOREACH(slave, link->slaves) {
2003 link_update_operstate(slave, false);
2004
2005 if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
2006 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
2007 }
2008 }
2009
2010 link_get_address_states(link, &ipv4_address_state, &ipv6_address_state, &address_state);
2011
2012 /* Mapping of address and carrier state vs operational state
2013 * carrier state
2014 * | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
2015 * ------------------------------------------------------------------------------
2016 * off | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
2017 * address_state degraded | off | no-carrier | dormant | degraded | degraded | enslaved
2018 * routable | off | no-carrier | dormant | routable | routable | routable
2019 */
2020
2021 if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_ROUTABLE)
2022 operstate = LINK_OPERSTATE_ROUTABLE;
2023 else if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_DEGRADED)
2024 operstate = LINK_OPERSTATE_DEGRADED;
2025 else if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
2026 operstate = (LinkOperationalState) carrier_state;
2027 else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
2028 operstate = LINK_OPERSTATE_ROUTABLE;
2029 else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
2030 operstate = LINK_OPERSTATE_DEGRADED;
2031 else
2032 operstate = LINK_OPERSTATE_ENSLAVED;
2033
2034 LinkOperationalStateRange req;
2035 link_required_operstate_for_online(link, &req);
2036
2037 /* Only determine online state for managed links with RequiredForOnline=yes */
2038 if (!link->network || !link->network->required_for_online)
2039 online_state = _LINK_ONLINE_STATE_INVALID;
2040
2041 else if (!operational_state_is_in_range(operstate, &req))
2042 online_state = LINK_ONLINE_STATE_OFFLINE;
2043
2044 else {
2045 AddressFamily required_family = link_required_family_for_online(link);
2046 bool needs_ipv4 = required_family & ADDRESS_FAMILY_IPV4;
2047 bool needs_ipv6 = required_family & ADDRESS_FAMILY_IPV6;
2048
2049 /* The operational state is within the range required for online.
2050 * If a particular address family is also required, we might revert
2051 * to offline in the blocks below. */
2052 online_state = LINK_ONLINE_STATE_ONLINE;
2053
2054 if (req.min >= LINK_OPERSTATE_DEGRADED) {
2055 if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_DEGRADED)
2056 online_state = LINK_ONLINE_STATE_OFFLINE;
2057 if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_DEGRADED)
2058 online_state = LINK_ONLINE_STATE_OFFLINE;
2059 }
2060
2061 if (req.min >= LINK_OPERSTATE_ROUTABLE) {
2062 if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_ROUTABLE)
2063 online_state = LINK_ONLINE_STATE_OFFLINE;
2064 if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_ROUTABLE)
2065 online_state = LINK_ONLINE_STATE_OFFLINE;
2066 }
2067 }
2068
2069 if (link->carrier_state != carrier_state) {
2070 link->carrier_state = carrier_state;
2071 changed = true;
2072 if (strv_extend(&p, "CarrierState") < 0)
2073 log_oom();
2074 }
2075
2076 if (link->address_state != address_state) {
2077 link->address_state = address_state;
2078 changed = true;
2079 if (strv_extend(&p, "AddressState") < 0)
2080 log_oom();
2081 }
2082
2083 if (link->ipv4_address_state != ipv4_address_state) {
2084 link->ipv4_address_state = ipv4_address_state;
2085 changed = true;
2086 if (strv_extend(&p, "IPv4AddressState") < 0)
2087 log_oom();
2088 }
2089
2090 if (link->ipv6_address_state != ipv6_address_state) {
2091 link->ipv6_address_state = ipv6_address_state;
2092 changed = true;
2093 if (strv_extend(&p, "IPv6AddressState") < 0)
2094 log_oom();
2095 }
2096
2097 if (link->operstate != operstate) {
2098 link->operstate = operstate;
2099 changed = true;
2100 if (strv_extend(&p, "OperationalState") < 0)
2101 log_oom();
2102 }
2103
2104 if (link->online_state != online_state) {
2105 link->online_state = online_state;
2106 changed = true;
2107 if (strv_extend(&p, "OnlineState") < 0)
2108 log_oom();
2109 }
2110
2111 if (p)
2112 link_send_changed_strv(link, p);
2113 if (changed)
2114 link_dirty(link);
2115
2116 if (also_update_master) {
2117 Link *master;
2118
2119 if (link_get_master(link, &master) >= 0)
2120 link_update_operstate(master, true);
2121 }
2122 }
2123
2124 bool link_has_carrier(Link *link) {
2125 assert(link);
2126 return netif_has_carrier(link->kernel_operstate, link->flags);
2127 }
2128
2129 bool link_multicast_enabled(Link *link) {
2130 assert(link);
2131
2132 /* If Multicast= is specified, use the value. */
2133 if (link->network && link->network->multicast >= 0)
2134 return link->network->multicast;
2135
2136 /* Otherwise, return the current state. */
2137 return FLAGS_SET(link->flags, IFF_MULTICAST);
2138 }
2139
2140 #define FLAG_STRING(string, flag, old, new) \
2141 (((old ^ new) & flag) \
2142 ? ((old & flag) ? (" -" string) : (" +" string)) \
2143 : "")
2144
2145 static int link_update_flags(Link *link, sd_netlink_message *message) {
2146 bool link_was_admin_up, had_carrier;
2147 uint8_t operstate;
2148 unsigned flags;
2149 int r;
2150
2151 assert(link);
2152 assert(message);
2153
2154 r = sd_rtnl_message_link_get_flags(message, &flags);
2155 if (r < 0)
2156 return log_link_debug_errno(link, r, "rtnl: failed to read link flags: %m");
2157
2158 r = sd_netlink_message_read_u8(message, IFLA_OPERSTATE, &operstate);
2159 if (r == -ENODATA)
2160 /* If we got a message without operstate, assume the state was unchanged. */
2161 operstate = link->kernel_operstate;
2162 else if (r < 0)
2163 return log_link_debug_errno(link, r, "rtnl: failed to read operational state: %m");
2164
2165 if (link->flags == flags && link->kernel_operstate == operstate)
2166 return 0;
2167
2168 if (link->flags != flags) {
2169 unsigned unknown_flags, unknown_flags_added, unknown_flags_removed;
2170
2171 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",
2172 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
2173 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
2174 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
2175 FLAG_STRING("UP", IFF_UP, link->flags, flags),
2176 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
2177 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
2178 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
2179 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
2180 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
2181 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
2182 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
2183 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
2184 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
2185 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
2186 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
2187 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
2188 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
2189 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
2190 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
2191
2192 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
2193 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
2194 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
2195 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
2196 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
2197 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
2198 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
2199 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
2200
2201 if (unknown_flags_added)
2202 log_link_debug(link, "Unknown link flags gained, ignoring: %#.5x", unknown_flags_added);
2203
2204 if (unknown_flags_removed)
2205 log_link_debug(link, "Unknown link flags lost, ignoring: %#.5x", unknown_flags_removed);
2206 }
2207
2208 link_was_admin_up = link->flags & IFF_UP;
2209 had_carrier = link_has_carrier(link);
2210
2211 link->flags = flags;
2212 link->kernel_operstate = operstate;
2213
2214 link_update_operstate(link, true);
2215
2216 r = 0;
2217
2218 if (!link_was_admin_up && (link->flags & IFF_UP))
2219 r = link_admin_state_up(link);
2220 else if (link_was_admin_up && !(link->flags & IFF_UP))
2221 r = link_admin_state_down(link);
2222 if (r < 0)
2223 return r;
2224
2225 if (!had_carrier && link_has_carrier(link))
2226 r = link_carrier_gained(link);
2227 else if (had_carrier && !link_has_carrier(link))
2228 link_carrier_lost(link);
2229 if (r < 0)
2230 return r;
2231
2232 return 0;
2233 }
2234
2235 static int link_update_master(Link *link, sd_netlink_message *message) {
2236 int master_ifindex, r;
2237
2238 assert(link);
2239 assert(message);
2240
2241 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t*) &master_ifindex);
2242 if (r == -ENODATA)
2243 master_ifindex = 0; /* no master interface */
2244 else if (r < 0)
2245 return log_link_debug_errno(link, r, "rtnl: failed to read master ifindex: %m");
2246
2247 if (master_ifindex == link->ifindex)
2248 master_ifindex = 0;
2249
2250 if (master_ifindex != link->master_ifindex) {
2251 if (link->master_ifindex == 0)
2252 log_link_debug(link, "Attached to master interface: %i", master_ifindex);
2253 else if (master_ifindex == 0)
2254 log_link_debug(link, "Detached from master interface: %i", link->master_ifindex);
2255 else
2256 log_link_debug(link, "Master interface changed: %i %s %i", link->master_ifindex,
2257 glyph(GLYPH_ARROW_RIGHT), master_ifindex);
2258
2259 link_drop_from_master(link);
2260 link->master_ifindex = master_ifindex;
2261
2262 /* Updating master ifindex may cause operational state change, e.g. carrier <-> enslaved */
2263 link_dirty(link);
2264 }
2265
2266 r = link_append_to_master(link);
2267 if (r < 0)
2268 return log_link_debug_errno(link, r, "Failed to append link to master: %m");
2269
2270 return 0;
2271 }
2272
2273 static int link_update_driver(Link *link, sd_netlink_message *message) {
2274 int r;
2275
2276 assert(link);
2277 assert(link->manager);
2278 assert(message);
2279
2280 /* Driver is already read. Assuming the driver is never changed. */
2281 if (link->ethtool_driver_read)
2282 return 0;
2283
2284 /* When udevd is running, read the driver after the interface is initialized by udevd.
2285 * Otherwise, ethtool may not work correctly. See issue #22538.
2286 * When udevd is not running, read the value when the interface is detected. */
2287 if (udev_available() && !link->dev)
2288 return 0;
2289
2290 link->ethtool_driver_read = true;
2291
2292 r = ethtool_get_driver(&link->manager->ethtool_fd, link->ifname, &link->driver);
2293 if (r < 0) {
2294 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
2295 return 0;
2296 }
2297
2298 log_link_debug(link, "Found driver: %s", strna(link->driver));
2299
2300 if (streq_ptr(link->driver, "dsa")) {
2301 uint32_t dsa_master_ifindex = 0;
2302
2303 r = sd_netlink_message_read_u32(message, IFLA_LINK, &dsa_master_ifindex);
2304 if (r < 0 && r != -ENODATA)
2305 return log_link_debug_errno(link, r, "rtnl: failed to read ifindex of the DSA master interface: %m");
2306
2307 if (dsa_master_ifindex > INT_MAX) {
2308 log_link_debug(link, "rtnl: received too large DSA master ifindex (%"PRIu32" > INT_MAX), ignoring.",
2309 dsa_master_ifindex);
2310 dsa_master_ifindex = 0;
2311 }
2312
2313 link->dsa_master_ifindex = (int) dsa_master_ifindex;
2314 }
2315
2316 return 1; /* needs reconfigure */
2317 }
2318
2319 static int link_update_permanent_hardware_address_from_ethtool(Link *link, sd_netlink_message *message) {
2320 int r;
2321
2322 assert(link);
2323 assert(link->manager);
2324 assert(message);
2325
2326 if (link->ethtool_permanent_hw_addr_read)
2327 return 0;
2328
2329 /* When udevd is running, read the permanent hardware address after the interface is
2330 * initialized by udevd. Otherwise, ethtool may not work correctly. See issue #22538.
2331 * When udevd is not running, read the value when the interface is detected. */
2332 if (udev_available() && !link->dev)
2333 return 0;
2334
2335 /* If the interface does not have a hardware address, then it will not have a permanent address either. */
2336 r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, NULL);
2337 if (r == -ENODATA)
2338 return 0;
2339 if (r < 0)
2340 return log_link_debug_errno(link, r, "Failed to read IFLA_ADDRESS attribute: %m");
2341
2342 link->ethtool_permanent_hw_addr_read = true;
2343
2344 r = ethtool_get_permanent_hw_addr(&link->manager->ethtool_fd, link->ifname, &link->permanent_hw_addr);
2345 if (r < 0)
2346 log_link_debug_errno(link, r, "Permanent hardware address not found, continuing without: %m");
2347
2348 return 0;
2349 }
2350
2351 static int link_update_permanent_hardware_address(Link *link, sd_netlink_message *message) {
2352 int r;
2353
2354 assert(link);
2355 assert(link->manager);
2356 assert(message);
2357
2358 if (link->permanent_hw_addr.length > 0)
2359 return 0;
2360
2361 r = netlink_message_read_hw_addr(message, IFLA_PERM_ADDRESS, &link->permanent_hw_addr);
2362 if (r < 0) {
2363 if (r != -ENODATA)
2364 return log_link_debug_errno(link, r, "Failed to read IFLA_PERM_ADDRESS attribute: %m");
2365
2366 /* Fallback to ethtool for kernels older than v5.6 (f74877a5457d34d604dba6dbbb13c4c05bac8b93). */
2367 r = link_update_permanent_hardware_address_from_ethtool(link, message);
2368 if (r < 0)
2369 return r;
2370 }
2371
2372 if (link->permanent_hw_addr.length > 0)
2373 log_link_debug(link, "Saved permanent hardware address: %s", HW_ADDR_TO_STR(&link->permanent_hw_addr));
2374
2375 return 1; /* needs reconfigure */
2376 }
2377
2378 static int link_update_hardware_address(Link *link, sd_netlink_message *message) {
2379 struct hw_addr_data addr;
2380 int r;
2381
2382 assert(link);
2383 assert(message);
2384
2385 r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr);
2386 if (r < 0 && r != -ENODATA)
2387 return log_link_debug_errno(link, r, "rtnl: failed to read broadcast address: %m");
2388
2389 r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &addr);
2390 if (r == -ENODATA)
2391 return 0;
2392 if (r < 0)
2393 return log_link_debug_errno(link, r, "rtnl: failed to read hardware address: %m");
2394
2395 if (hw_addr_equal(&link->hw_addr, &addr))
2396 return 0;
2397
2398 if (link->hw_addr.length == 0)
2399 log_link_debug(link, "Saved hardware address: %s", HW_ADDR_TO_STR(&addr));
2400 else {
2401 log_link_debug(link, "Hardware address is changed: %s %s %s",
2402 HW_ADDR_TO_STR(&link->hw_addr),
2403 glyph(GLYPH_ARROW_RIGHT),
2404 HW_ADDR_TO_STR(&addr));
2405
2406 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
2407 }
2408
2409 link->hw_addr = addr;
2410
2411 if (!hw_addr_is_null(&link->hw_addr)) {
2412 r = hashmap_ensure_put(&link->manager->links_by_hw_addr, &hw_addr_hash_ops, &link->hw_addr, link);
2413 if (r == -EEXIST && streq_ptr(link->kind, "bond"))
2414 /* bonding master and its slaves have the same hardware address. */
2415 r = hashmap_replace(link->manager->links_by_hw_addr, &link->hw_addr, link);
2416 if (r < 0)
2417 log_link_debug_errno(link, r, "Failed to manage link by its new hardware address, ignoring: %m");
2418 }
2419
2420 r = ipv4acd_update_mac(link);
2421 if (r < 0)
2422 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m");
2423
2424 r = ipv4ll_update_mac(link);
2425 if (r < 0)
2426 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
2427
2428 r = dhcp4_update_mac(link);
2429 if (r < 0)
2430 return log_link_debug_errno(link, r, "Could not update MAC address in DHCP client: %m");
2431
2432 r = dhcp6_update_mac(link);
2433 if (r < 0)
2434 return log_link_debug_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
2435
2436 r = radv_update_mac(link);
2437 if (r < 0)
2438 return log_link_debug_errno(link, r, "Could not update MAC address for Router Advertisement: %m");
2439
2440 if (link->ndisc && link->hw_addr.length == ETH_ALEN) {
2441 r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether);
2442 if (r < 0)
2443 return log_link_debug_errno(link, r, "Could not update MAC for NDisc: %m");
2444 }
2445
2446 if (link->lldp_rx) {
2447 r = sd_lldp_rx_set_filter_address(link->lldp_rx, &link->hw_addr.ether);
2448 if (r < 0)
2449 return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Rx: %m");
2450 }
2451
2452 if (link->lldp_tx) {
2453 r = sd_lldp_tx_set_hwaddr(link->lldp_tx, &link->hw_addr.ether);
2454 if (r < 0)
2455 return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Tx: %m");
2456 }
2457
2458 return 1; /* needs reconfigure */
2459 }
2460
2461 static int link_update_mtu(Link *link, sd_netlink_message *message) {
2462 uint32_t mtu, min_mtu = 0, max_mtu = UINT32_MAX;
2463 int r;
2464
2465 assert(link);
2466 assert(message);
2467
2468 r = sd_netlink_message_read_u32(message, IFLA_MTU, &mtu);
2469 if (r == -ENODATA)
2470 return 0;
2471 if (r < 0)
2472 return log_link_debug_errno(link, r, "rtnl: failed to read MTU in RTM_NEWLINK message: %m");
2473 if (mtu == 0)
2474 return 0;
2475
2476 r = sd_netlink_message_read_u32(message, IFLA_MIN_MTU, &min_mtu);
2477 if (r < 0 && r != -ENODATA)
2478 return log_link_debug_errno(link, r, "rtnl: failed to read minimum MTU in RTM_NEWLINK message: %m");
2479
2480 r = sd_netlink_message_read_u32(message, IFLA_MAX_MTU, &max_mtu);
2481 if (r < 0 && r != -ENODATA)
2482 return log_link_debug_errno(link, r, "rtnl: failed to read maximum MTU in RTM_NEWLINK message: %m");
2483
2484 if (max_mtu == 0)
2485 max_mtu = UINT32_MAX;
2486
2487 link->min_mtu = min_mtu;
2488 link->max_mtu = max_mtu;
2489
2490 if (link->original_mtu == 0) {
2491 link->original_mtu = mtu;
2492 log_link_debug(link, "Saved original MTU %" PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2493 link->original_mtu, link->min_mtu, link->max_mtu);
2494 }
2495
2496 if (link->mtu == mtu)
2497 return 0;
2498
2499 if (link->mtu != 0)
2500 log_link_debug(link, "MTU is changed: %"PRIu32" %s %"PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2501 link->mtu, glyph(GLYPH_ARROW_RIGHT), mtu,
2502 link->min_mtu, link->max_mtu);
2503
2504 link->mtu = mtu;
2505
2506 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
2507 /* The kernel resets IPv6 MTU after changing device MTU. So, we need to re-set IPv6 MTU again. */
2508 (void) link_set_ipv6_mtu_async(link);
2509
2510 if (link->dhcp_client) {
2511 r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
2512 if (r < 0)
2513 return log_link_debug_errno(link, r, "Could not update MTU in DHCP client: %m");
2514 }
2515
2516 if (link->radv) {
2517 r = sd_radv_set_mtu(link->radv, link->mtu);
2518 if (r < 0)
2519 return log_link_debug_errno(link, r, "Could not set MTU for Router Advertisement: %m");
2520 }
2521
2522 return 0;
2523 }
2524
2525 static int link_update_alternative_names(Link *link, sd_netlink_message *message) {
2526 _cleanup_strv_free_ char **altnames = NULL;
2527 int r;
2528
2529 assert(link);
2530 assert(message);
2531
2532 r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &altnames);
2533 if (r == -ENODATA)
2534 /* The message does not have IFLA_PROP_LIST container attribute. It does not mean the
2535 * interface has no alternative name. */
2536 return 0;
2537 if (r < 0)
2538 return log_link_debug_errno(link, r, "rtnl: failed to read alternative names: %m");
2539
2540 if (strv_equal(altnames, link->alternative_names))
2541 return 0;
2542
2543 STRV_FOREACH(n, link->alternative_names)
2544 hashmap_remove(link->manager->links_by_name, *n);
2545
2546 strv_free_and_replace(link->alternative_names, altnames);
2547
2548 STRV_FOREACH(n, link->alternative_names) {
2549 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, *n, link);
2550 if (r < 0)
2551 return log_link_debug_errno(link, r, "Failed to manage link by its new alternative names: %m");
2552 }
2553
2554 return 1; /* needs reconfigure */
2555 }
2556
2557 static int link_update_name(Link *link, sd_netlink_message *message) {
2558 char ifname_from_index[IF_NAMESIZE];
2559 const char *ifname;
2560 int r;
2561
2562 assert(link);
2563 assert(message);
2564
2565 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
2566 if (r == -ENODATA)
2567 /* Hmm?? But ok. */
2568 return 0;
2569 if (r < 0)
2570 return log_link_debug_errno(link, r, "Failed to read interface name in RTM_NEWLINK message: %m");
2571
2572 if (streq(ifname, link->ifname))
2573 return 0;
2574
2575 r = format_ifname(link->ifindex, ifname_from_index);
2576 if (r < 0)
2577 return log_link_debug_errno(link, r, "Could not get interface name for index %i.", link->ifindex);
2578
2579 if (!streq(ifname, ifname_from_index)) {
2580 log_link_debug(link, "New interface name '%s' received from the kernel does not correspond "
2581 "with the name currently configured on the actual interface '%s'. Ignoring.",
2582 ifname, ifname_from_index);
2583 return 0;
2584 }
2585
2586 log_link_info(link, "Interface name change detected, renamed to %s.", ifname);
2587
2588 hashmap_remove(link->manager->links_by_name, link->ifname);
2589
2590 r = free_and_strdup(&link->ifname, ifname);
2591 if (r < 0)
2592 return log_oom_debug();
2593
2594 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, link->ifname, link);
2595 if (r < 0)
2596 return log_link_debug_errno(link, r, "Failed to manage link by its new name: %m");
2597
2598 if (link->dhcp_client) {
2599 r = sd_dhcp_client_set_ifname(link->dhcp_client, link->ifname);
2600 if (r < 0)
2601 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP client: %m");
2602 }
2603
2604 if (link->dhcp6_client) {
2605 r = sd_dhcp6_client_set_ifname(link->dhcp6_client, link->ifname);
2606 if (r < 0)
2607 return log_link_debug_errno(link, r, "Failed to update interface name in DHCPv6 client: %m");
2608 }
2609
2610 if (link->ndisc) {
2611 r = sd_ndisc_set_ifname(link->ndisc, link->ifname);
2612 if (r < 0)
2613 return log_link_debug_errno(link, r, "Failed to update interface name in NDisc: %m");
2614 }
2615
2616 if (link->dhcp_server) {
2617 r = sd_dhcp_server_set_ifname(link->dhcp_server, link->ifname);
2618 if (r < 0)
2619 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP server: %m");
2620 }
2621
2622 if (link->radv) {
2623 r = sd_radv_set_ifname(link->radv, link->ifname);
2624 if (r < 0)
2625 return log_link_debug_errno(link, r, "Failed to update interface name in Router Advertisement: %m");
2626 }
2627
2628 if (link->lldp_rx) {
2629 r = sd_lldp_rx_set_ifname(link->lldp_rx, link->ifname);
2630 if (r < 0)
2631 return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Rx: %m");
2632 }
2633
2634 if (link->lldp_tx) {
2635 r = sd_lldp_tx_set_ifname(link->lldp_tx, link->ifname);
2636 if (r < 0)
2637 return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Tx: %m");
2638 }
2639
2640 if (link->ipv4ll) {
2641 r = sd_ipv4ll_set_ifname(link->ipv4ll, link->ifname);
2642 if (r < 0)
2643 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4LL client: %m");
2644 }
2645
2646 r = ipv4acd_set_ifname(link);
2647 if (r < 0)
2648 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4ACD client: %m");
2649
2650 return 1; /* needs reconfigure */
2651 }
2652
2653 static int link_update(Link *link, sd_netlink_message *message) {
2654 bool needs_reconfigure = false;
2655 int r;
2656
2657 assert(link);
2658 assert(message);
2659
2660 r = link_update_name(link, message);
2661 if (r < 0)
2662 return r;
2663 needs_reconfigure = needs_reconfigure || r > 0;
2664
2665 r = link_update_alternative_names(link, message);
2666 if (r < 0)
2667 return r;
2668 needs_reconfigure = needs_reconfigure || r > 0;
2669
2670 r = link_update_mtu(link, message);
2671 if (r < 0)
2672 return r;
2673
2674 r = link_update_driver(link, message);
2675 if (r < 0)
2676 return r;
2677 needs_reconfigure = needs_reconfigure || r > 0;
2678
2679 r = link_update_permanent_hardware_address(link, message);
2680 if (r < 0)
2681 return r;
2682 needs_reconfigure = needs_reconfigure || r > 0;
2683
2684 r = link_update_hardware_address(link, message);
2685 if (r < 0)
2686 return r;
2687 needs_reconfigure = needs_reconfigure || r > 0;
2688
2689 r = link_update_master(link, message);
2690 if (r < 0)
2691 return r;
2692
2693 r = link_update_ipv6ll_addrgen_mode(link, message);
2694 if (r < 0)
2695 return r;
2696
2697 r = link_update_flags(link, message);
2698 if (r < 0)
2699 return r;
2700
2701 r = link_update_bridge_vlan(link, message);
2702 if (r < 0)
2703 return r;
2704
2705 return needs_reconfigure;
2706 }
2707
2708 static Link *link_drop_or_unref(Link *link) {
2709 if (!link)
2710 return NULL;
2711 if (!link->manager)
2712 return link_unref(link);
2713 return link_drop(link);
2714 }
2715
2716 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_drop_or_unref);
2717
2718 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
2719 _cleanup_free_ char *ifname = NULL, *kind = NULL, *state_file = NULL, *lease_file = NULL;
2720 _cleanup_(link_drop_or_unrefp) Link *link = NULL;
2721 unsigned short iftype;
2722 int r, ifindex;
2723
2724 assert(manager);
2725 assert(message);
2726 assert(ret);
2727
2728 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2729 if (r < 0)
2730 return log_debug_errno(r, "rtnl: failed to read ifindex from link message: %m");
2731 else if (ifindex <= 0)
2732 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "rtnl: received link message without valid ifindex.");
2733
2734 r = sd_rtnl_message_link_get_type(message, &iftype);
2735 if (r < 0)
2736 return log_debug_errno(r, "rtnl: failed to read interface type from link message: %m");
2737
2738 r = sd_netlink_message_read_string_strdup(message, IFLA_IFNAME, &ifname);
2739 if (r < 0)
2740 return log_debug_errno(r, "rtnl: failed to read interface name from link message: %m");
2741
2742 /* check for link kind */
2743 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
2744 if (r >= 0) {
2745 r = sd_netlink_message_read_string_strdup(message, IFLA_INFO_KIND, &kind);
2746 if (r < 0 && r != -ENODATA)
2747 return log_debug_errno(r, "rtnl: failed to read interface kind from link message: %m");
2748 r = sd_netlink_message_exit_container(message);
2749 if (r < 0)
2750 return log_debug_errno(r, "rtnl: failed to exit IFLA_LINKINFO container: %m");
2751 }
2752
2753 if (!manager->test_mode) {
2754 /* Do not update state files when running in test mode. */
2755 if (asprintf(&state_file, "/run/systemd/netif/links/%d", ifindex) < 0)
2756 return log_oom_debug();
2757
2758 if (asprintf(&lease_file, "/run/systemd/netif/leases/%d", ifindex) < 0)
2759 return log_oom_debug();
2760 }
2761
2762 link = new(Link, 1);
2763 if (!link)
2764 return -ENOMEM;
2765
2766 *link = (Link) {
2767 .n_ref = 1,
2768 .state = LINK_STATE_PENDING,
2769 .online_state = _LINK_ONLINE_STATE_INVALID,
2770 .automatic_reconfigure_ratelimit = (const RateLimit) { .interval = 10 * USEC_PER_SEC, .burst = 5 },
2771 .ifindex = ifindex,
2772 .iftype = iftype,
2773 .ifname = TAKE_PTR(ifname),
2774 .kind = TAKE_PTR(kind),
2775
2776 .bridge_vlan_pvid = UINT16_MAX,
2777
2778 .ipv6ll_address_gen_mode = _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_INVALID,
2779
2780 .state_file = TAKE_PTR(state_file),
2781 .lease_file = TAKE_PTR(lease_file),
2782
2783 .n_dns = UINT_MAX,
2784 .dns_default_route = -1,
2785 .llmnr = _RESOLVE_SUPPORT_INVALID,
2786 .mdns = _RESOLVE_SUPPORT_INVALID,
2787 .dnssec_mode = _DNSSEC_MODE_INVALID,
2788 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
2789 };
2790
2791 r = hashmap_ensure_put(&manager->links_by_index, &link_hash_ops, INT_TO_PTR(link->ifindex), link);
2792 if (r < 0)
2793 return log_link_debug_errno(link, r, "Failed to store link into manager: %m");
2794
2795 link->manager = manager;
2796
2797 r = hashmap_ensure_put(&manager->links_by_name, &string_hash_ops, link->ifname, link);
2798 if (r < 0)
2799 return log_link_debug_errno(link, r, "Failed to manage link by its interface name: %m");
2800
2801 log_link_debug(link, "Saved new link: ifindex=%i, iftype=%s(%u), kind=%s",
2802 link->ifindex, strna(arphrd_to_name(link->iftype)), link->iftype, strna(link->kind));
2803
2804 /* If contained in this set, the link is wireless and the corresponding NL80211_CMD_NEW_INTERFACE
2805 * message arrived too early. Request the wireless link information again.
2806 */
2807 if (set_remove(manager->new_wlan_ifindices, INT_TO_PTR(link->ifindex))) {
2808 r = link_get_wlan_interface(link);
2809 if (r < 0)
2810 log_link_warning_errno(link, r, "Failed to get wireless interface, ignoring: %m");
2811 }
2812
2813 *ret = TAKE_PTR(link);
2814 return 0;
2815 }
2816
2817 int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, Manager *manager) {
2818 Link *link = NULL;
2819 NetDev *netdev = NULL;
2820 uint16_t type;
2821 const char *name;
2822 int r, ifindex;
2823
2824 assert(rtnl);
2825 assert(message);
2826 assert(manager);
2827
2828 if (sd_netlink_message_is_error(message)) {
2829 r = sd_netlink_message_get_errno(message);
2830 if (r < 0)
2831 log_message_warning_errno(message, r, "rtnl: Could not receive link message, ignoring");
2832
2833 return 0;
2834 }
2835
2836 r = sd_netlink_message_get_type(message, &type);
2837 if (r < 0) {
2838 log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
2839 return 0;
2840 } else if (!IN_SET(type, RTM_NEWLINK, RTM_DELLINK)) {
2841 log_warning("rtnl: Received unexpected message type %u when processing link, ignoring.", type);
2842 return 0;
2843 }
2844
2845 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2846 if (r < 0) {
2847 log_warning_errno(r, "rtnl: Could not get ifindex from link message, ignoring: %m");
2848 return 0;
2849 } else if (ifindex <= 0) {
2850 log_warning("rtnl: received link message with invalid ifindex %d, ignoring.", ifindex);
2851 return 0;
2852 }
2853
2854 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
2855 if (r < 0) {
2856 log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
2857 return 0;
2858 }
2859
2860 (void) link_get_by_index(manager, ifindex, &link);
2861 (void) netdev_get(manager, name, &netdev);
2862
2863 switch (type) {
2864 case RTM_NEWLINK:
2865 if (netdev) {
2866 /* netdev exists, so make sure the ifindex matches */
2867 r = netdev_set_ifindex(netdev, message);
2868 if (r < 0) {
2869 log_netdev_warning_errno(netdev, r, "Could not process new link message for netdev, ignoring: %m");
2870 netdev_enter_failed(netdev);
2871 return 0;
2872 }
2873 }
2874
2875 if (!link) {
2876 /* link is new, so add it */
2877 r = link_new(manager, message, &link);
2878 if (r < 0) {
2879 log_warning_errno(r, "Could not process new link message: %m");
2880 return 0;
2881 }
2882
2883 r = link_update(link, message);
2884 if (r < 0) {
2885 log_link_warning_errno(link, r, "Could not process link message: %m");
2886 link_enter_failed(link);
2887 return 0;
2888 }
2889
2890 if (link->manager->test_mode) {
2891 log_link_debug(link, "Running in test mode, refusing to enter initialized state.");
2892 link_set_state(link, LINK_STATE_UNMANAGED);
2893 return 0;
2894 }
2895
2896 /* Do not enter initialized state if we are enumerating. */
2897 if (manager->enumerating)
2898 return 0;
2899
2900 r = link_check_initialized(link);
2901 if (r < 0) {
2902 log_link_warning_errno(link, r, "Failed to check link is initialized: %m");
2903 link_enter_failed(link);
2904 return 0;
2905 }
2906 } else {
2907 r = link_update(link, message);
2908 if (r < 0) {
2909 log_link_warning_errno(link, r, "Could not process link message: %m");
2910 link_enter_failed(link);
2911 return 0;
2912 }
2913 if (r == 0)
2914 return 0;
2915
2916 if (link->manager->test_mode) {
2917 log_link_debug(link, "Running in test mode, refusing to configure interface.");
2918 link_set_state(link, LINK_STATE_UNMANAGED);
2919 return 0;
2920 }
2921
2922 /* Do not configure interface if we are enumerating. */
2923 if (manager->enumerating)
2924 return 0;
2925
2926 r = link_reconfigure_impl(link, /* flags = */ 0);
2927 if (r < 0) {
2928 log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
2929 link_enter_failed(link);
2930 return 0;
2931 }
2932 }
2933 break;
2934
2935 case RTM_DELLINK:
2936 link_drop(link);
2937 netdev_drop(netdev);
2938 break;
2939
2940 default:
2941 assert_not_reached();
2942 }
2943
2944 return 1;
2945 }
2946
2947 int link_getlink_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, const char *error_msg) {
2948 uint16_t message_type;
2949 int r;
2950
2951 assert(m);
2952 assert(link);
2953 assert(error_msg);
2954
2955 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2956 return 0;
2957
2958 r = sd_netlink_message_get_errno(m);
2959 if (r < 0) {
2960 log_link_message_warning_errno(link, m, r, "%s", error_msg);
2961 link_enter_failed(link);
2962 return 0;
2963 }
2964
2965 r = sd_netlink_message_get_type(m, &message_type);
2966 if (r < 0) {
2967 log_link_debug_errno(link, r, "rtnl: failed to read link message type, ignoring: %m");
2968 return 0;
2969 }
2970 if (message_type != RTM_NEWLINK) {
2971 log_link_debug(link, "rtnl: received invalid link message type, ignoring.");
2972 return 0;
2973 }
2974
2975 r = link_update(link, m);
2976 if (r < 0) {
2977 link_enter_failed(link);
2978 return 0;
2979 }
2980
2981 return 1;
2982 }
2983
2984 int link_call_getlink(Link *link, link_netlink_message_handler_t callback) {
2985 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2986 int r;
2987
2988 assert(link);
2989 assert(link->manager);
2990 assert(link->manager->rtnl);
2991 assert(callback);
2992
2993 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
2994 if (r < 0)
2995 return r;
2996
2997 r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
2998 link_netlink_destroy_callback, link);
2999 if (r < 0)
3000 return r;
3001
3002 link_ref(link);
3003 return 0;
3004 }
3005
3006 static const char* const link_state_table[_LINK_STATE_MAX] = {
3007 [LINK_STATE_PENDING] = "pending",
3008 [LINK_STATE_INITIALIZED] = "initialized",
3009 [LINK_STATE_CONFIGURING] = "configuring",
3010 [LINK_STATE_CONFIGURED] = "configured",
3011 [LINK_STATE_UNMANAGED] = "unmanaged",
3012 [LINK_STATE_FAILED] = "failed",
3013 [LINK_STATE_LINGER] = "linger",
3014 };
3015
3016 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
3017
3018 int link_flags_to_string_alloc(uint32_t flags, char **ret) {
3019 _cleanup_free_ char *str = NULL;
3020 static const char* map[] = {
3021 [LOG2U(IFF_UP)] = "up", /* interface is up. */
3022 [LOG2U(IFF_BROADCAST)] = "broadcast", /* broadcast address valid. */
3023 [LOG2U(IFF_DEBUG)] = "debug", /* turn on debugging. */
3024 [LOG2U(IFF_LOOPBACK)] = "loopback", /* interface is a loopback net. */
3025 [LOG2U(IFF_POINTOPOINT)] = "point-to-point", /* interface has p-p link. */
3026 [LOG2U(IFF_NOTRAILERS)] = "no-trailers", /* avoid use of trailers. */
3027 [LOG2U(IFF_RUNNING)] = "running", /* interface RFC2863 OPER_UP. */
3028 [LOG2U(IFF_NOARP)] = "no-arp", /* no ARP protocol. */
3029 [LOG2U(IFF_PROMISC)] = "promiscuous", /* receive all packets. */
3030 [LOG2U(IFF_ALLMULTI)] = "all-multicast", /* receive all multicast packets. */
3031 [LOG2U(IFF_MASTER)] = "master", /* master of a load balancer. */
3032 [LOG2U(IFF_SLAVE)] = "slave", /* slave of a load balancer. */
3033 [LOG2U(IFF_MULTICAST)] = "multicast", /* supports multicast. */
3034 [LOG2U(IFF_PORTSEL)] = "portsel", /* can set media type. */
3035 [LOG2U(IFF_AUTOMEDIA)] = "auto-media", /* auto media select active. */
3036 [LOG2U(IFF_DYNAMIC)] = "dynamic", /* dialup device with changing addresses. */
3037 [LOG2U(IFF_LOWER_UP)] = "lower-up", /* driver signals L1 up. */
3038 [LOG2U(IFF_DORMANT)] = "dormant", /* driver signals dormant. */
3039 [LOG2U(IFF_ECHO)] = "echo", /* echo sent packets. */
3040 };
3041
3042 assert(ret);
3043
3044 for (size_t i = 0; i < ELEMENTSOF(map); i++)
3045 if (BIT_SET(flags, i) && map[i])
3046 if (!strextend_with_separator(&str, ",", map[i]))
3047 return -ENOMEM;
3048
3049 *ret = TAKE_PTR(str);
3050 return 0;
3051 }
3052
3053 static const char * const kernel_operstate_table[] = {
3054 [IF_OPER_UNKNOWN] = "unknown",
3055 [IF_OPER_NOTPRESENT] = "not-present",
3056 [IF_OPER_DOWN] = "down",
3057 [IF_OPER_LOWERLAYERDOWN] = "lower-layer-down",
3058 [IF_OPER_TESTING] = "testing",
3059 [IF_OPER_DORMANT] = "dormant",
3060 [IF_OPER_UP] = "up",
3061 };
3062
3063 DEFINE_STRING_TABLE_LOOKUP_TO_STRING(kernel_operstate, int);
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