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src/partition: remove unnecessary uses of "make sure"
[thirdparty/systemd.git] / src / network / networkd-link.c
1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include <net/if.h>
4 #include <netinet/in.h>
5 #include <linux/if.h>
6 #include <linux/if_arp.h>
7 #include <linux/if_link.h>
8 #include <linux/netdevice.h>
9 #include <sys/socket.h>
10 #include <unistd.h>
11
12 #include "alloc-util.h"
13 #include "arphrd-util.h"
14 #include "batadv.h"
15 #include "bond.h"
16 #include "bridge.h"
17 #include "bus-util.h"
18 #include "device-private.h"
19 #include "device-util.h"
20 #include "dhcp-lease-internal.h"
21 #include "env-file.h"
22 #include "ethtool-util.h"
23 #include "event-util.h"
24 #include "fd-util.h"
25 #include "fileio.h"
26 #include "format-util.h"
27 #include "fs-util.h"
28 #include "glyph-util.h"
29 #include "logarithm.h"
30 #include "missing_network.h"
31 #include "netlink-util.h"
32 #include "network-internal.h"
33 #include "networkd-address-label.h"
34 #include "networkd-address.h"
35 #include "networkd-bridge-fdb.h"
36 #include "networkd-bridge-mdb.h"
37 #include "networkd-bridge-vlan.h"
38 #include "networkd-can.h"
39 #include "networkd-dhcp-prefix-delegation.h"
40 #include "networkd-dhcp-server.h"
41 #include "networkd-dhcp4.h"
42 #include "networkd-dhcp6.h"
43 #include "networkd-ipv4acd.h"
44 #include "networkd-ipv4ll.h"
45 #include "networkd-ipv6-proxy-ndp.h"
46 #include "networkd-link-bus.h"
47 #include "networkd-link.h"
48 #include "networkd-lldp-tx.h"
49 #include "networkd-manager.h"
50 #include "networkd-ndisc.h"
51 #include "networkd-neighbor.h"
52 #include "networkd-nexthop.h"
53 #include "networkd-queue.h"
54 #include "networkd-radv.h"
55 #include "networkd-route-util.h"
56 #include "networkd-route.h"
57 #include "networkd-routing-policy-rule.h"
58 #include "networkd-setlink.h"
59 #include "networkd-sriov.h"
60 #include "networkd-state-file.h"
61 #include "networkd-sysctl.h"
62 #include "networkd-wifi.h"
63 #include "set.h"
64 #include "socket-util.h"
65 #include "stdio-util.h"
66 #include "string-table.h"
67 #include "strv.h"
68 #include "tc.h"
69 #include "tmpfile-util.h"
70 #include "tuntap.h"
71 #include "udev-util.h"
72 #include "vrf.h"
73
74 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_may_have_ipv6ll(link, /* check_multicast = */ false))
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 void link_ntp_settings_clear(Link *link) {
202 link->ntp = strv_free(link->ntp);
203 }
204
205 void link_dns_settings_clear(Link *link) {
206 if (link->n_dns != UINT_MAX)
207 for (unsigned i = 0; i < link->n_dns; i++)
208 in_addr_full_free(link->dns[i]);
209 link->dns = mfree(link->dns);
210 link->n_dns = UINT_MAX;
211
212 link->search_domains = ordered_set_free(link->search_domains);
213 link->route_domains = ordered_set_free(link->route_domains);
214
215 link->dns_default_route = -1;
216 link->llmnr = _RESOLVE_SUPPORT_INVALID;
217 link->mdns = _RESOLVE_SUPPORT_INVALID;
218 link->dnssec_mode = _DNSSEC_MODE_INVALID;
219 link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
220
221 link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
222 }
223
224 static void link_free_engines(Link *link) {
225 if (!link)
226 return;
227
228 link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
229
230 link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client);
231 link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
232 link->dhcp4_6rd_tunnel_name = mfree(link->dhcp4_6rd_tunnel_name);
233
234 link->lldp_rx = sd_lldp_rx_unref(link->lldp_rx);
235 link->lldp_tx = sd_lldp_tx_unref(link->lldp_tx);
236
237 link->ipv4acd_by_address = hashmap_free(link->ipv4acd_by_address);
238
239 link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
240
241 link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
242 link->dhcp6_lease = sd_dhcp6_lease_unref(link->dhcp6_lease);
243
244 link->ndisc = sd_ndisc_unref(link->ndisc);
245 link->ndisc_expire = sd_event_source_disable_unref(link->ndisc_expire);
246 ndisc_flush(link);
247
248 link->radv = sd_radv_unref(link->radv);
249 }
250
251 static Link *link_free(Link *link) {
252 assert(link);
253
254 link_ntp_settings_clear(link);
255 link_dns_settings_clear(link);
256
257 link->neighbors = set_free(link->neighbors);
258 link->addresses = set_free(link->addresses);
259 link->qdiscs = set_free(link->qdiscs);
260 link->tclasses = set_free(link->tclasses);
261
262 link->dhcp_pd_prefixes = set_free(link->dhcp_pd_prefixes);
263
264 link_free_engines(link);
265
266 set_free(link->sr_iov_virt_port_ifindices);
267 free(link->ifname);
268 strv_free(link->alternative_names);
269 free(link->kind);
270 free(link->ssid);
271 free(link->previous_ssid);
272 free(link->driver);
273
274 unlink_and_free(link->lease_file);
275 unlink_and_free(link->state_file);
276
277 sd_device_unref(link->dev);
278 netdev_unref(link->netdev);
279
280 hashmap_free(link->bound_to_links);
281 hashmap_free(link->bound_by_links);
282
283 set_free_with_destructor(link->slaves, link_unref);
284
285 network_unref(link->network);
286
287 sd_event_source_disable_unref(link->carrier_lost_timer);
288
289 return mfree(link);
290 }
291
292 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
293
294 int link_get_by_index(Manager *m, int ifindex, Link **ret) {
295 Link *link;
296
297 assert(m);
298
299 if (ifindex <= 0)
300 return -EINVAL;
301
302 link = hashmap_get(m->links_by_index, INT_TO_PTR(ifindex));
303 if (!link)
304 return -ENODEV;
305
306 if (ret)
307 *ret = link;
308 return 0;
309 }
310
311 int link_get_by_name(Manager *m, const char *ifname, Link **ret) {
312 Link *link;
313
314 assert(m);
315 assert(ifname);
316
317 link = hashmap_get(m->links_by_name, ifname);
318 if (!link)
319 return -ENODEV;
320
321 if (ret)
322 *ret = link;
323 return 0;
324 }
325
326 int link_get_by_hw_addr(Manager *m, const struct hw_addr_data *hw_addr, Link **ret) {
327 Link *link;
328
329 assert(m);
330 assert(hw_addr);
331
332 link = hashmap_get(m->links_by_hw_addr, hw_addr);
333 if (!link)
334 return -ENODEV;
335
336 if (ret)
337 *ret = link;
338 return 0;
339 }
340
341 int link_get_master(Link *link, Link **ret) {
342 assert(link);
343 assert(link->manager);
344 assert(ret);
345
346 if (link->master_ifindex <= 0 || link->master_ifindex == link->ifindex)
347 return -ENODEV;
348
349 return link_get_by_index(link->manager, link->master_ifindex, ret);
350 }
351
352 void link_set_state(Link *link, LinkState state) {
353 assert(link);
354
355 if (link->state == state)
356 return;
357
358 log_link_debug(link, "State changed: %s -> %s",
359 link_state_to_string(link->state),
360 link_state_to_string(state));
361
362 link->state = state;
363
364 link_send_changed(link, "AdministrativeState", NULL);
365 link_dirty(link);
366 }
367
368 int link_stop_engines(Link *link, bool may_keep_dhcp) {
369 int r, ret = 0;
370
371 assert(link);
372 assert(link->manager);
373 assert(link->manager->event);
374
375 bool keep_dhcp = may_keep_dhcp &&
376 link->network &&
377 !link->network->dhcp_send_decline && /* IPv4 ACD for the DHCPv4 address is running. */
378 (link->manager->restarting ||
379 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
380
381 if (!keep_dhcp) {
382 r = sd_dhcp_client_stop(link->dhcp_client);
383 if (r < 0)
384 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv4 client: %m"));
385 }
386
387 r = sd_dhcp_server_stop(link->dhcp_server);
388 if (r < 0)
389 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv4 server: %m"));
390
391 r = sd_lldp_rx_stop(link->lldp_rx);
392 if (r < 0)
393 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop LLDP Rx: %m"));
394
395 r = sd_lldp_tx_stop(link->lldp_tx);
396 if (r < 0)
397 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop LLDP Tx: %m"));
398
399 r = sd_ipv4ll_stop(link->ipv4ll);
400 if (r < 0)
401 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv4 link-local: %m"));
402
403 r = ipv4acd_stop(link);
404 if (r < 0)
405 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv4 ACD client: %m"));
406
407 r = sd_dhcp6_client_stop(link->dhcp6_client);
408 if (r < 0)
409 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv6 client: %m"));
410
411 r = dhcp_pd_remove(link, /* only_marked = */ false);
412 if (r < 0)
413 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not remove DHCPv6 PD addresses and routes: %m"));
414
415 r = ndisc_stop(link);
416 if (r < 0)
417 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv6 Router Discovery: %m"));
418
419 ndisc_flush(link);
420
421 r = sd_radv_stop(link->radv);
422 if (r < 0)
423 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv6 Router Advertisement: %m"));
424
425 return ret;
426 }
427
428 void link_enter_failed(Link *link) {
429 int r;
430
431 assert(link);
432
433 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
434 return;
435
436 log_link_warning(link, "Failed");
437
438 link_set_state(link, LINK_STATE_FAILED);
439
440 if (!ratelimit_below(&link->automatic_reconfigure_ratelimit)) {
441 log_link_warning(link, "The interface entered the failed state frequently, refusing to reconfigure it automatically.");
442 goto stop;
443 }
444
445 log_link_info(link, "Trying to reconfigure the interface.");
446 r = link_reconfigure(link, /* force = */ true);
447 if (r < 0) {
448 log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
449 goto stop;
450 }
451
452 return;
453
454 stop:
455 (void) link_stop_engines(link, /* may_keep_dhcp = */ false);
456 }
457
458 void link_check_ready(Link *link) {
459 Address *a;
460
461 assert(link);
462
463 if (link->state == LINK_STATE_CONFIGURED)
464 return;
465
466 if (link->state != LINK_STATE_CONFIGURING)
467 return (void) log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state));
468
469 if (!link->network)
470 return (void) log_link_debug(link, "%s(): link is unmanaged.", __func__);
471
472 if (!link->tc_configured)
473 return (void) log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
474
475 if (link->set_link_messages > 0)
476 return (void) log_link_debug(link, "%s(): link layer is configuring.", __func__);
477
478 if (!link->activated)
479 return (void) log_link_debug(link, "%s(): link is not activated.", __func__);
480
481 if (link->iftype == ARPHRD_CAN)
482 /* let's shortcut things for CAN which doesn't need most of checks below. */
483 goto ready;
484
485 if (!link->stacked_netdevs_created)
486 return (void) log_link_debug(link, "%s(): stacked netdevs are not created.", __func__);
487
488 if (!link->static_addresses_configured)
489 return (void) log_link_debug(link, "%s(): static addresses are not configured.", __func__);
490
491 if (!link->static_address_labels_configured)
492 return (void) log_link_debug(link, "%s(): static address labels are not configured.", __func__);
493
494 if (!link->static_bridge_fdb_configured)
495 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
496
497 if (!link->static_bridge_mdb_configured)
498 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
499
500 if (!link->static_ipv6_proxy_ndp_configured)
501 return (void) log_link_debug(link, "%s(): static IPv6 proxy NDP addresses are not configured.", __func__);
502
503 if (!link->static_neighbors_configured)
504 return (void) log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
505
506 if (!link->static_nexthops_configured)
507 return (void) log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
508
509 if (!link->static_routes_configured)
510 return (void) log_link_debug(link, "%s(): static routes are not configured.", __func__);
511
512 if (!link->static_routing_policy_rules_configured)
513 return (void) log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
514
515 if (!link->sr_iov_configured)
516 return (void) log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
517
518 /* IPv6LL is assigned after the link gains its carrier. */
519 if (!link->network->configure_without_carrier &&
520 link_ipv6ll_enabled(link) &&
521 !in6_addr_is_set(&link->ipv6ll_address))
522 return (void) log_link_debug(link, "%s(): IPv6LL is not configured yet.", __func__);
523
524 /* All static addresses must be ready. */
525 bool has_static_address = false;
526 SET_FOREACH(a, link->addresses) {
527 if (a->source != NETWORK_CONFIG_SOURCE_STATIC)
528 continue;
529 if (!address_is_ready(a))
530 return (void) log_link_debug(link, "%s(): static address %s is not ready.", __func__,
531 IN_ADDR_PREFIX_TO_STRING(a->family, &a->in_addr, a->prefixlen));
532 has_static_address = true;
533 }
534
535 /* If at least one static address is requested, do not request that dynamic addressing protocols are finished. */
536 if (has_static_address)
537 goto ready;
538
539 /* If no dynamic addressing protocol enabled, assume the interface is ready.
540 * Note, ignore NDisc when ConfigureWithoutCarrier= is enabled, as IPv6AcceptRA= is enabled by default. */
541 if (!link_ipv4ll_enabled(link) && !link_dhcp4_enabled(link) &&
542 !link_dhcp6_enabled(link) && !link_dhcp_pd_is_enabled(link) &&
543 (link->network->configure_without_carrier || !link_ndisc_enabled(link)))
544 goto ready;
545
546 bool ipv4ll_ready =
547 link_ipv4ll_enabled(link) && link->ipv4ll_address_configured &&
548 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_IPV4LL);
549 bool dhcp4_ready =
550 link_dhcp4_enabled(link) && link->dhcp4_configured &&
551 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP4);
552 bool dhcp6_ready =
553 link_dhcp6_enabled(link) && link->dhcp6_configured &&
554 (!link->network->dhcp6_use_address ||
555 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP6));
556 bool dhcp_pd_ready =
557 link_dhcp_pd_is_enabled(link) && link->dhcp_pd_configured &&
558 (!link->network->dhcp_pd_assign ||
559 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP_PD));
560 bool ndisc_ready =
561 link_ndisc_enabled(link) && link->ndisc_configured &&
562 (!link->network->ndisc_use_autonomous_prefix ||
563 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_NDISC));
564
565 /* If the uplink for PD is self, then request the corresponding DHCP protocol is also ready. */
566 if (dhcp_pd_is_uplink(link, link, /* accept_auto = */ false)) {
567 if (link_dhcp4_enabled(link) && link->network->dhcp_use_6rd &&
568 sd_dhcp_lease_has_6rd(link->dhcp_lease)) {
569 if (!link->dhcp4_configured)
570 return (void) log_link_debug(link, "%s(): DHCPv4 6rd prefix is assigned, but DHCPv4 protocol is not finished yet.", __func__);
571 if (!dhcp_pd_ready)
572 return (void) log_link_debug(link, "%s(): DHCPv4 is finished, but prefix acquired by DHCPv4-6rd is not assigned yet.", __func__);
573 }
574
575 if (link_dhcp6_enabled(link) && link->network->dhcp6_use_pd_prefix &&
576 sd_dhcp6_lease_has_pd_prefix(link->dhcp6_lease)) {
577 if (!link->dhcp6_configured)
578 return (void) log_link_debug(link, "%s(): DHCPv6 IA_PD prefix is assigned, but DHCPv6 protocol is not finished yet.", __func__);
579 if (!dhcp_pd_ready)
580 return (void) log_link_debug(link, "%s(): DHCPv6 is finished, but prefix acquired by DHCPv6 IA_PD is not assigned yet.", __func__);
581 }
582 }
583
584 /* At least one dynamic addressing protocol is finished. */
585 if (!ipv4ll_ready && !dhcp4_ready && !dhcp6_ready && !dhcp_pd_ready && !ndisc_ready)
586 return (void) log_link_debug(link, "%s(): dynamic addressing protocols are enabled but none of them finished yet.", __func__);
587
588 log_link_debug(link, "%s(): IPv4LL:%s DHCPv4:%s DHCPv6:%s DHCP-PD:%s NDisc:%s",
589 __func__,
590 yes_no(ipv4ll_ready),
591 yes_no(dhcp4_ready),
592 yes_no(dhcp6_ready),
593 yes_no(dhcp_pd_ready),
594 yes_no(ndisc_ready));
595
596 ready:
597 link_set_state(link, LINK_STATE_CONFIGURED);
598 }
599
600 static int link_request_static_configs(Link *link) {
601 int r;
602
603 assert(link);
604 assert(link->network);
605 assert(link->state != _LINK_STATE_INVALID);
606
607 r = link_request_static_addresses(link);
608 if (r < 0)
609 return r;
610
611 r = link_request_static_address_labels(link);
612 if (r < 0)
613 return r;
614
615 r = link_request_static_bridge_fdb(link);
616 if (r < 0)
617 return r;
618
619 r = link_request_static_bridge_mdb(link);
620 if (r < 0)
621 return r;
622
623 r = link_request_static_ipv6_proxy_ndp_addresses(link);
624 if (r < 0)
625 return r;
626
627 r = link_request_static_neighbors(link);
628 if (r < 0)
629 return r;
630
631 r = link_request_static_nexthops(link, false);
632 if (r < 0)
633 return r;
634
635 r = link_request_static_routes(link, false);
636 if (r < 0)
637 return r;
638
639 r = link_request_static_routing_policy_rules(link);
640 if (r < 0)
641 return r;
642
643 return 0;
644 }
645
646 static int link_request_stacked_netdevs(Link *link) {
647 NetDev *netdev;
648 int r;
649
650 assert(link);
651
652 link->stacked_netdevs_created = false;
653
654 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) {
655 r = link_request_stacked_netdev(link, netdev);
656 if (r < 0)
657 return r;
658 }
659
660 if (link->create_stacked_netdev_messages == 0) {
661 link->stacked_netdevs_created = true;
662 link_check_ready(link);
663 }
664
665 return 0;
666 }
667
668 static int link_acquire_dynamic_ipv6_conf(Link *link) {
669 int r;
670
671 assert(link);
672
673 r = radv_start(link);
674 if (r < 0)
675 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Advertisement engine: %m");
676
677 r = ndisc_start(link);
678 if (r < 0)
679 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Discovery: %m");
680
681 r = dhcp6_start(link);
682 if (r < 0)
683 return log_link_warning_errno(link, r, "Failed to start DHCPv6 client: %m");
684
685 return 0;
686 }
687
688 static int link_acquire_dynamic_ipv4_conf(Link *link) {
689 int r;
690
691 assert(link);
692 assert(link->manager);
693 assert(link->manager->event);
694
695 if (link->dhcp_client) {
696 r = dhcp4_start(link);
697 if (r < 0)
698 return log_link_warning_errno(link, r, "Failed to start DHCPv4 client: %m");
699
700 log_link_debug(link, "Acquiring DHCPv4 lease.");
701
702 } else if (link->ipv4ll) {
703 if (in4_addr_is_set(&link->network->ipv4ll_start_address)) {
704 r = sd_ipv4ll_set_address(link->ipv4ll, &link->network->ipv4ll_start_address);
705 if (r < 0)
706 return log_link_warning_errno(link, r, "Could not set IPv4 link-local start address: %m");
707 }
708
709 r = sd_ipv4ll_start(link->ipv4ll);
710 if (r < 0)
711 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
712
713 log_link_debug(link, "Acquiring IPv4 link-local address.");
714 }
715
716 if (link->dhcp_server) {
717 r = sd_dhcp_server_start(link->dhcp_server);
718 if (r < 0)
719 return log_link_warning_errno(link, r, "Could not start DHCP server: %m");
720 }
721
722 r = ipv4acd_start(link);
723 if (r < 0)
724 return log_link_warning_errno(link, r, "Could not start IPv4 ACD client: %m");
725
726 return 0;
727 }
728
729 static int link_acquire_dynamic_conf(Link *link) {
730 int r;
731
732 assert(link);
733 assert(link->network);
734
735 r = link_acquire_dynamic_ipv4_conf(link);
736 if (r < 0)
737 return r;
738
739 if (in6_addr_is_set(&link->ipv6ll_address)) {
740 r = link_acquire_dynamic_ipv6_conf(link);
741 if (r < 0)
742 return r;
743 }
744
745 if (!link_radv_enabled(link) || !link->network->dhcp_pd_announce) {
746 /* DHCPv6PD downstream does not require IPv6LL address. But may require RADV to be
747 * configured, and RADV may not be configured yet here. Only acquire subnet prefix when
748 * RADV is disabled, or the announcement of the prefix is disabled. Otherwise, the
749 * below will be called in radv_start(). */
750 r = dhcp_request_prefix_delegation(link);
751 if (r < 0)
752 return log_link_warning_errno(link, r, "Failed to request DHCP delegated subnet prefix: %m");
753 }
754
755 if (link->lldp_tx) {
756 r = sd_lldp_tx_start(link->lldp_tx);
757 if (r < 0)
758 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
759 }
760
761 if (link->lldp_rx) {
762 r = sd_lldp_rx_start(link->lldp_rx);
763 if (r < 0)
764 return log_link_warning_errno(link, r, "Failed to start LLDP client: %m");
765 }
766
767 return 0;
768 }
769
770 int link_ipv6ll_gained(Link *link) {
771 int r;
772
773 assert(link);
774
775 log_link_info(link, "Gained IPv6LL");
776
777 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
778 return 0;
779
780 r = link_acquire_dynamic_ipv6_conf(link);
781 if (r < 0)
782 return r;
783
784 link_check_ready(link);
785 return 0;
786 }
787
788 int link_handle_bound_to_list(Link *link) {
789 bool required_up = false;
790 bool link_is_up = false;
791 Link *l;
792
793 assert(link);
794
795 /* If at least one interface in bound_to_links has carrier, then make this interface up.
796 * If all interfaces in bound_to_links do not, then make this interface down. */
797
798 if (hashmap_isempty(link->bound_to_links))
799 return 0;
800
801 if (link->flags & IFF_UP)
802 link_is_up = true;
803
804 HASHMAP_FOREACH(l, link->bound_to_links)
805 if (link_has_carrier(l)) {
806 required_up = true;
807 break;
808 }
809
810 if (!required_up && link_is_up)
811 return link_request_to_bring_up_or_down(link, /* up = */ false);
812 if (required_up && !link_is_up)
813 return link_request_to_bring_up_or_down(link, /* up = */ true);
814
815 return 0;
816 }
817
818 static int link_handle_bound_by_list(Link *link) {
819 Link *l;
820 int r;
821
822 assert(link);
823
824 /* Update up or down state of interfaces which depend on this interface's carrier state. */
825
826 if (hashmap_isempty(link->bound_by_links))
827 return 0;
828
829 HASHMAP_FOREACH(l, link->bound_by_links) {
830 r = link_handle_bound_to_list(l);
831 if (r < 0)
832 return r;
833 }
834
835 return 0;
836 }
837
838 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
839 int r;
840
841 assert(link);
842 assert(carrier);
843
844 if (link == carrier)
845 return 0;
846
847 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
848 return 0;
849
850 r = hashmap_ensure_put(h, NULL, INT_TO_PTR(carrier->ifindex), carrier);
851 if (r < 0)
852 return r;
853
854 link_dirty(link);
855
856 return 0;
857 }
858
859 static int link_new_bound_by_list(Link *link) {
860 Manager *m;
861 Link *carrier;
862 int r;
863
864 assert(link);
865 assert(link->manager);
866
867 m = link->manager;
868
869 HASHMAP_FOREACH(carrier, m->links_by_index) {
870 if (!carrier->network)
871 continue;
872
873 if (strv_isempty(carrier->network->bind_carrier))
874 continue;
875
876 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
877 r = link_put_carrier(link, carrier, &link->bound_by_links);
878 if (r < 0)
879 return r;
880 }
881 }
882
883 HASHMAP_FOREACH(carrier, link->bound_by_links) {
884 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
885 if (r < 0)
886 return r;
887 }
888
889 return 0;
890 }
891
892 static int link_new_bound_to_list(Link *link) {
893 Manager *m;
894 Link *carrier;
895 int r;
896
897 assert(link);
898 assert(link->manager);
899
900 if (!link->network)
901 return 0;
902
903 if (strv_isempty(link->network->bind_carrier))
904 return 0;
905
906 m = link->manager;
907
908 HASHMAP_FOREACH(carrier, m->links_by_index) {
909 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
910 r = link_put_carrier(link, carrier, &link->bound_to_links);
911 if (r < 0)
912 return r;
913 }
914 }
915
916 HASHMAP_FOREACH(carrier, link->bound_to_links) {
917 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
918 if (r < 0)
919 return r;
920 }
921
922 return 0;
923 }
924
925 static void link_free_bound_to_list(Link *link) {
926 bool updated = false;
927 Link *bound_to;
928
929 assert(link);
930
931 while ((bound_to = hashmap_steal_first(link->bound_to_links))) {
932 updated = true;
933
934 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
935 link_dirty(bound_to);
936 }
937
938 if (updated)
939 link_dirty(link);
940 }
941
942 static void link_free_bound_by_list(Link *link) {
943 bool updated = false;
944 Link *bound_by;
945
946 assert(link);
947
948 while ((bound_by = hashmap_steal_first(link->bound_by_links))) {
949 updated = true;
950
951 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
952 link_dirty(bound_by);
953 link_handle_bound_to_list(bound_by);
954 }
955 }
956
957 if (updated)
958 link_dirty(link);
959 }
960
961 static int link_append_to_master(Link *link) {
962 Link *master;
963 int r;
964
965 assert(link);
966
967 /* - The link may have no master.
968 * - RTM_NEWLINK message about master interface may not be received yet. */
969 if (link_get_master(link, &master) < 0)
970 return 0;
971
972 r = set_ensure_put(&master->slaves, NULL, link);
973 if (r <= 0)
974 return r;
975
976 link_ref(link);
977 return 0;
978 }
979
980 static void link_drop_from_master(Link *link) {
981 Link *master;
982
983 assert(link);
984
985 if (!link->manager)
986 return;
987
988 if (link_get_master(link, &master) < 0)
989 return;
990
991 link_unref(set_remove(master->slaves, link));
992 }
993
994 static int link_drop_requests(Link *link) {
995 Request *req;
996 int ret = 0;
997
998 assert(link);
999 assert(link->manager);
1000
1001 ORDERED_SET_FOREACH(req, link->manager->request_queue) {
1002 if (req->link != link)
1003 continue;
1004
1005 /* If the request is already called, but its reply is not received, then we need to
1006 * drop the configuration (e.g. address) here. Note, if the configuration is known,
1007 * it will be handled later by link_drop_foreign_addresses() or so. */
1008 if (req->waiting_reply && link->state != LINK_STATE_LINGER)
1009 switch (req->type) {
1010 case REQUEST_TYPE_ADDRESS: {
1011 Address *address = ASSERT_PTR(req->userdata);
1012
1013 if (address_get(link, address, NULL) < 0)
1014 RET_GATHER(ret, address_remove(address, link));
1015 break;
1016 }
1017 case REQUEST_TYPE_NEIGHBOR: {
1018 Neighbor *neighbor = ASSERT_PTR(req->userdata);
1019
1020 if (neighbor_get(link, neighbor, NULL) < 0)
1021 RET_GATHER(ret, neighbor_remove(neighbor, link));
1022 break;
1023 }
1024 case REQUEST_TYPE_NEXTHOP: {
1025 NextHop *nexthop = ASSERT_PTR(req->userdata);
1026
1027 if (nexthop_get_by_id(link->manager, nexthop->id, NULL) < 0)
1028 RET_GATHER(ret, nexthop_remove(nexthop, link->manager));
1029 break;
1030 }
1031 case REQUEST_TYPE_ROUTE: {
1032 Route *route = ASSERT_PTR(req->userdata);
1033
1034 if (route_get(link->manager, route, NULL) < 0)
1035 RET_GATHER(ret, route_remove(route, link->manager));
1036 break;
1037 }
1038 default:
1039 ;
1040 }
1041
1042 request_detach(req);
1043 }
1044
1045 return ret;
1046 }
1047
1048 static Link *link_drop(Link *link) {
1049 if (!link)
1050 return NULL;
1051
1052 assert(link->manager);
1053
1054 link_set_state(link, LINK_STATE_LINGER);
1055
1056 /* Drop all references from other links and manager. Note that async netlink calls may have
1057 * references to the link, and they will be dropped when we receive replies. */
1058
1059 (void) link_drop_requests(link);
1060
1061 link_free_bound_to_list(link);
1062 link_free_bound_by_list(link);
1063
1064 link_clear_sr_iov_ifindices(link);
1065
1066 link_drop_from_master(link);
1067
1068 if (link->state_file)
1069 (void) unlink(link->state_file);
1070
1071 link_clean(link);
1072
1073 STRV_FOREACH(n, link->alternative_names)
1074 hashmap_remove(link->manager->links_by_name, *n);
1075 hashmap_remove(link->manager->links_by_name, link->ifname);
1076
1077 /* bonding master and its slaves have the same hardware address. */
1078 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
1079
1080 /* The following must be called at last. */
1081 assert_se(hashmap_remove(link->manager->links_by_index, INT_TO_PTR(link->ifindex)) == link);
1082 return link_unref(link);
1083 }
1084
1085 static int link_drop_foreign_config(Link *link) {
1086 int r;
1087
1088 assert(link);
1089 assert(link->manager);
1090
1091 /* Drop foreign config, but ignore unmanaged, loopback, or critical interfaces. We do not want
1092 * to remove loopback address or addresses used for root NFS. */
1093
1094 if (IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
1095 return 0;
1096 if (FLAGS_SET(link->flags, IFF_LOOPBACK))
1097 return 0;
1098 if (link->network->keep_configuration == KEEP_CONFIGURATION_YES)
1099 return 0;
1100
1101 r = link_drop_foreign_routes(link);
1102
1103 RET_GATHER(r, link_drop_foreign_nexthops(link));
1104 RET_GATHER(r, link_drop_foreign_addresses(link));
1105 RET_GATHER(r, link_drop_foreign_neighbors(link));
1106 RET_GATHER(r, manager_drop_foreign_routing_policy_rules(link->manager));
1107
1108 return r;
1109 }
1110
1111 static int link_drop_managed_config(Link *link) {
1112 int r;
1113
1114 assert(link);
1115 assert(link->manager);
1116
1117 r = link_drop_static_routes(link);
1118 RET_GATHER(r, link_drop_static_nexthops(link));
1119 RET_GATHER(r, link_drop_static_addresses(link));
1120 RET_GATHER(r, link_drop_static_neighbors(link));
1121 RET_GATHER(r, link_drop_static_routing_policy_rules(link));
1122
1123 return r;
1124 }
1125
1126 static void link_foreignize_config(Link *link) {
1127 assert(link);
1128 assert(link->manager);
1129
1130 link_foreignize_routes(link);
1131 link_foreignize_nexthops(link);
1132 link_foreignize_addresses(link);
1133 link_foreignize_neighbors(link);
1134 link_foreignize_routing_policy_rules(link);
1135 }
1136
1137 static int link_configure(Link *link) {
1138 int r;
1139
1140 assert(link);
1141 assert(link->network);
1142 assert(link->state == LINK_STATE_INITIALIZED);
1143
1144 link_set_state(link, LINK_STATE_CONFIGURING);
1145
1146 r = link_new_bound_to_list(link);
1147 if (r < 0)
1148 return r;
1149
1150 r = link_request_traffic_control(link);
1151 if (r < 0)
1152 return r;
1153
1154 r = link_configure_mtu(link);
1155 if (r < 0)
1156 return r;
1157
1158 if (link->iftype == ARPHRD_CAN) {
1159 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1160 r = link_request_to_set_can(link);
1161 if (r < 0)
1162 return r;
1163
1164 return link_request_to_activate(link);
1165 }
1166
1167 r = link_request_sr_iov_vfs(link);
1168 if (r < 0)
1169 return r;
1170
1171 r = link_set_sysctl(link);
1172 if (r < 0)
1173 return r;
1174
1175 r = link_request_to_set_mac(link, /* allow_retry = */ true);
1176 if (r < 0)
1177 return r;
1178
1179 r = link_request_to_set_ipoib(link);
1180 if (r < 0)
1181 return r;
1182
1183 r = link_request_to_set_flags(link);
1184 if (r < 0)
1185 return r;
1186
1187 r = link_request_to_set_group(link);
1188 if (r < 0)
1189 return r;
1190
1191 r = link_request_to_set_addrgen_mode(link);
1192 if (r < 0)
1193 return r;
1194
1195 r = link_request_to_set_master(link);
1196 if (r < 0)
1197 return r;
1198
1199 r = link_request_stacked_netdevs(link);
1200 if (r < 0)
1201 return r;
1202
1203 r = link_request_to_set_bond(link);
1204 if (r < 0)
1205 return r;
1206
1207 r = link_request_to_set_bridge(link);
1208 if (r < 0)
1209 return r;
1210
1211 r = link_request_to_set_bridge_vlan(link);
1212 if (r < 0)
1213 return r;
1214
1215 r = link_request_to_activate(link);
1216 if (r < 0)
1217 return r;
1218
1219 r = ipv4ll_configure(link);
1220 if (r < 0)
1221 return r;
1222
1223 r = link_request_dhcp4_client(link);
1224 if (r < 0)
1225 return r;
1226
1227 r = link_request_dhcp6_client(link);
1228 if (r < 0)
1229 return r;
1230
1231 r = link_request_ndisc(link);
1232 if (r < 0)
1233 return r;
1234
1235 r = link_request_dhcp_server(link);
1236 if (r < 0)
1237 return r;
1238
1239 r = link_request_radv(link);
1240 if (r < 0)
1241 return r;
1242
1243 r = link_lldp_rx_configure(link);
1244 if (r < 0)
1245 return r;
1246
1247 r = link_lldp_tx_configure(link);
1248 if (r < 0)
1249 return r;
1250
1251 r = link_drop_foreign_config(link);
1252 if (r < 0)
1253 return r;
1254
1255 r = link_request_static_configs(link);
1256 if (r < 0)
1257 return r;
1258
1259 if (!link_has_carrier(link))
1260 return 0;
1261
1262 return link_acquire_dynamic_conf(link);
1263 }
1264
1265 static int link_get_network(Link *link, Network **ret) {
1266 Network *network;
1267 int r;
1268
1269 assert(link);
1270 assert(link->manager);
1271 assert(ret);
1272
1273 ORDERED_HASHMAP_FOREACH(network, link->manager->networks) {
1274 bool warn = false;
1275
1276 r = net_match_config(
1277 &network->match,
1278 link->dev,
1279 &link->hw_addr,
1280 &link->permanent_hw_addr,
1281 link->driver,
1282 link->iftype,
1283 link->kind,
1284 link->ifname,
1285 link->alternative_names,
1286 link->wlan_iftype,
1287 link->ssid,
1288 &link->bssid);
1289 if (r < 0)
1290 return r;
1291 if (r == 0)
1292 continue;
1293
1294 if (network->match.ifname && link->dev) {
1295 uint8_t name_assign_type = NET_NAME_UNKNOWN;
1296 const char *attr;
1297
1298 if (sd_device_get_sysattr_value(link->dev, "name_assign_type", &attr) >= 0)
1299 (void) safe_atou8(attr, &name_assign_type);
1300
1301 warn = name_assign_type == NET_NAME_ENUM;
1302 }
1303
1304 log_link_full(link, warn ? LOG_WARNING : LOG_DEBUG,
1305 "found matching network '%s'%s.",
1306 network->filename,
1307 warn ? ", based on potentially unpredictable interface name" : "");
1308
1309 if (network->unmanaged)
1310 return -ENOENT;
1311
1312 *ret = network;
1313 return 0;
1314 }
1315
1316 return -ENOENT;
1317 }
1318
1319 int link_reconfigure_impl(Link *link, bool force) {
1320 Network *network = NULL;
1321 NetDev *netdev = NULL;
1322 int r;
1323
1324 assert(link);
1325
1326 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
1327 return 0;
1328
1329 r = netdev_get(link->manager, link->ifname, &netdev);
1330 if (r < 0 && r != -ENOENT)
1331 return r;
1332
1333 r = link_get_network(link, &network);
1334 if (r < 0 && r != -ENOENT)
1335 return r;
1336
1337 if (link->state != LINK_STATE_UNMANAGED && !network)
1338 /* If link is in initialized state, then link->network is also NULL. */
1339 force = true;
1340
1341 if (link->network == network && !force)
1342 return 0;
1343
1344 if (network) {
1345 _cleanup_free_ char *joined = strv_join(network->dropins, ", ");
1346
1347 if (link->state == LINK_STATE_INITIALIZED)
1348 log_link_info(link, "Configuring with %s%s%s%s.",
1349 network->filename,
1350 isempty(joined) ? "" : " (dropins: ",
1351 joined,
1352 isempty(joined) ? "" : ")");
1353 else
1354 log_link_info(link, "Reconfiguring with %s%s%s%s.",
1355 network->filename,
1356 isempty(joined) ? "" : " (dropins: ",
1357 joined,
1358 isempty(joined) ? "" : ")");
1359 } else
1360 log_link_full(link, link->state == LINK_STATE_INITIALIZED ? LOG_DEBUG : LOG_INFO,
1361 "Unmanaging interface.");
1362
1363 /* Dropping old .network file */
1364 r = link_stop_engines(link, false);
1365 if (r < 0)
1366 return r;
1367
1368 r = link_drop_requests(link);
1369 if (r < 0)
1370 return r;
1371
1372 if (network && !force && network->keep_configuration != KEEP_CONFIGURATION_YES)
1373 /* When a new/updated .network file is assigned, first make all configs (addresses,
1374 * routes, and so on) foreign, and then drop unnecessary configs later by
1375 * link_drop_foreign_config() in link_configure().
1376 * Note, when KeepConfiguration=yes, link_drop_foreign_config() does nothing. Hence,
1377 * here we need to drop the configs such as addresses, routes, and so on configured by
1378 * the previously assigned .network file. */
1379 link_foreignize_config(link);
1380 else {
1381 /* Remove all managed configs. Note, foreign configs are removed in later by
1382 * link_configure() -> link_drop_foreign_config() if the link is managed by us. */
1383 r = link_drop_managed_config(link);
1384 if (r < 0)
1385 return r;
1386 }
1387
1388 /* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the
1389 * bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will
1390 * not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the
1391 * map here, as it depends on .network files assigned to other links. */
1392 link_free_bound_to_list(link);
1393
1394 link_free_engines(link);
1395 link->network = network_unref(link->network);
1396
1397 netdev_unref(link->netdev);
1398 link->netdev = netdev_ref(netdev);
1399
1400 if (!network) {
1401 link_set_state(link, LINK_STATE_UNMANAGED);
1402 return 0;
1403 }
1404
1405 /* Then, apply new .network file */
1406 link->network = network_ref(network);
1407 link_update_operstate(link, true);
1408 link_dirty(link);
1409
1410 link_set_state(link, LINK_STATE_INITIALIZED);
1411 link->activated = false;
1412
1413 r = link_configure(link);
1414 if (r < 0)
1415 return r;
1416
1417 return 1;
1418 }
1419
1420 static int link_reconfigure_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, bool force) {
1421 int r;
1422
1423 assert(link);
1424
1425 r = link_getlink_handler_internal(rtnl, m, link, "Failed to update link state");
1426 if (r <= 0)
1427 return r;
1428
1429 r = link_reconfigure_impl(link, force);
1430 if (r < 0) {
1431 link_enter_failed(link);
1432 return 0;
1433 }
1434
1435 return r;
1436 }
1437
1438 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1439 return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ false);
1440 }
1441
1442 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1443 return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ true);
1444 }
1445
1446 int link_reconfigure(Link *link, bool force) {
1447 int r;
1448
1449 assert(link);
1450
1451 /* When link in pending or initialized state, then link_configure() will be called. To prevent
1452 * the function from being called multiple times simultaneously, refuse to reconfigure the
1453 * interface in these cases. */
1454 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
1455 return 0; /* 0 means no-op. */
1456
1457 r = link_call_getlink(link, force ? link_force_reconfigure_handler : link_reconfigure_handler);
1458 if (r < 0)
1459 return r;
1460
1461 return 1; /* 1 means the interface will be reconfigured. */
1462 }
1463
1464 typedef struct ReconfigureData {
1465 Link *link;
1466 Manager *manager;
1467 sd_bus_message *message;
1468 } ReconfigureData;
1469
1470 static void reconfigure_data_destroy_callback(ReconfigureData *data) {
1471 int r;
1472
1473 assert(data);
1474 assert(data->link);
1475 assert(data->manager);
1476 assert(data->manager->reloading > 0);
1477 assert(data->message);
1478
1479 link_unref(data->link);
1480
1481 data->manager->reloading--;
1482 if (data->manager->reloading <= 0) {
1483 r = sd_bus_reply_method_return(data->message, NULL);
1484 if (r < 0)
1485 log_warning_errno(r, "Failed to send reply for 'Reload' DBus method, ignoring: %m");
1486 }
1487
1488 sd_bus_message_unref(data->message);
1489 free(data);
1490 }
1491
1492 static int reconfigure_handler_on_bus_method_reload(sd_netlink *rtnl, sd_netlink_message *m, ReconfigureData *data) {
1493 assert(data);
1494 assert(data->link);
1495 return link_reconfigure_handler_internal(rtnl, m, data->link, /* force = */ false);
1496 }
1497
1498 int link_reconfigure_on_bus_method_reload(Link *link, sd_bus_message *message) {
1499 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1500 _cleanup_free_ ReconfigureData *data = NULL;
1501 int r;
1502
1503 assert(link);
1504 assert(link->manager);
1505 assert(link->manager->rtnl);
1506 assert(message);
1507
1508 /* See comments in link_reconfigure() above. */
1509 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
1510 return 0;
1511
1512 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
1513 if (r < 0)
1514 return r;
1515
1516 data = new(ReconfigureData, 1);
1517 if (!data)
1518 return -ENOMEM;
1519
1520 r = netlink_call_async(link->manager->rtnl, NULL, req,
1521 reconfigure_handler_on_bus_method_reload,
1522 reconfigure_data_destroy_callback, data);
1523 if (r < 0)
1524 return r;
1525
1526 *data = (ReconfigureData) {
1527 .link = link_ref(link),
1528 .manager = link->manager,
1529 .message = sd_bus_message_ref(message),
1530 };
1531
1532 link->manager->reloading++;
1533
1534 TAKE_PTR(data);
1535 return 0;
1536 }
1537
1538 static int link_initialized_and_synced(Link *link) {
1539 int r;
1540
1541 assert(link);
1542 assert(link->manager);
1543
1544 if (link->manager->test_mode) {
1545 log_link_debug(link, "Running in test mode, refusing to enter initialized state.");
1546 link_set_state(link, LINK_STATE_UNMANAGED);
1547 return 0;
1548 }
1549
1550 if (link->state == LINK_STATE_PENDING) {
1551 log_link_debug(link, "Link state is up-to-date");
1552 link_set_state(link, LINK_STATE_INITIALIZED);
1553
1554 r = link_new_bound_by_list(link);
1555 if (r < 0)
1556 return r;
1557
1558 r = link_handle_bound_by_list(link);
1559 if (r < 0)
1560 return r;
1561 }
1562
1563 return link_reconfigure_impl(link, /* force = */ false);
1564 }
1565
1566 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1567 int r;
1568
1569 r = link_getlink_handler_internal(rtnl, m, link, "Failed to wait for the interface to be initialized");
1570 if (r <= 0)
1571 return r;
1572
1573 r = link_initialized_and_synced(link);
1574 if (r < 0)
1575 link_enter_failed(link);
1576
1577 return 0;
1578 }
1579
1580 static int link_initialized(Link *link, sd_device *device) {
1581 int r;
1582
1583 assert(link);
1584 assert(device);
1585
1586 /* Always replace with the new sd_device object. As the sysname (and possibly other properties
1587 * or sysattrs) may be outdated. */
1588 device_unref_and_replace(link->dev, device);
1589
1590 if (link->dhcp_client) {
1591 r = sd_dhcp_client_attach_device(link->dhcp_client, link->dev);
1592 if (r < 0)
1593 log_link_warning_errno(link, r, "Failed to attach device to DHCPv4 client, ignoring: %m");
1594 }
1595
1596 if (link->dhcp6_client) {
1597 r = sd_dhcp6_client_attach_device(link->dhcp6_client, link->dev);
1598 if (r < 0)
1599 log_link_warning_errno(link, r, "Failed to attach device to DHCPv6 client, ignoring: %m");
1600 }
1601
1602 r = link_set_sr_iov_ifindices(link);
1603 if (r < 0)
1604 log_link_warning_errno(link, r, "Failed to manage SR-IOV PF and VF ports, ignoring: %m");
1605
1606 if (link->state != LINK_STATE_PENDING)
1607 return link_reconfigure(link, /* force = */ false);
1608
1609 log_link_debug(link, "udev initialized link");
1610
1611 /* udev has initialized the link, but we don't know if we have yet
1612 * processed the NEWLINK messages with the latest state. Do a GETLINK,
1613 * when it returns we know that the pending NEWLINKs have already been
1614 * processed and that we are up-to-date */
1615
1616 return link_call_getlink(link, link_initialized_handler);
1617 }
1618
1619 static int link_check_initialized(Link *link) {
1620 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
1621 int r;
1622
1623 assert(link);
1624
1625 if (!udev_available())
1626 return link_initialized_and_synced(link);
1627
1628 /* udev should be around */
1629 r = sd_device_new_from_ifindex(&device, link->ifindex);
1630 if (r < 0) {
1631 log_link_debug_errno(link, r, "Could not find device, waiting for device initialization: %m");
1632 return 0;
1633 }
1634
1635 r = sd_device_get_is_initialized(device);
1636 if (r < 0)
1637 return log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
1638 if (r == 0) {
1639 /* not yet ready */
1640 log_link_debug(link, "link pending udev initialization...");
1641 return 0;
1642 }
1643
1644 r = device_is_renaming(device);
1645 if (r < 0)
1646 return log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
1647 if (r > 0) {
1648 log_link_debug(link, "Interface is being renamed, pending initialization.");
1649 return 0;
1650 }
1651
1652 r = device_is_processing(device);
1653 if (r < 0)
1654 return log_link_warning_errno(link, r, "Failed to determine whether the device is being processed: %m");
1655 if (r > 0) {
1656 log_link_debug(link, "Interface is being processed by udevd, pending initialization.");
1657 return 0;
1658 }
1659
1660 return link_initialized(link, device);
1661 }
1662
1663 int manager_udev_process_link(Manager *m, sd_device *device, sd_device_action_t action) {
1664 int r, ifindex;
1665 const char *s;
1666 Link *link;
1667
1668 assert(m);
1669 assert(device);
1670
1671 r = sd_device_get_ifindex(device, &ifindex);
1672 if (r < 0)
1673 return log_device_debug_errno(device, r, "Failed to get ifindex: %m");
1674
1675 r = link_get_by_index(m, ifindex, &link);
1676 if (r < 0) {
1677 /* This error is not critical, as the corresponding rtnl message may be received later. */
1678 log_device_debug_errno(device, r, "Failed to get link from ifindex %i, ignoring: %m", ifindex);
1679 return 0;
1680 }
1681
1682 /* Let's unref the sd-device object assigned to the corresponding Link object, but keep the Link
1683 * object here. It will be removed only when rtnetlink says so. */
1684 if (action == SD_DEVICE_REMOVE) {
1685 link->dev = sd_device_unref(link->dev);
1686 return 0;
1687 }
1688
1689 r = device_is_renaming(device);
1690 if (r < 0)
1691 return log_device_debug_errno(device, r, "Failed to determine if the device is renaming or not: %m");
1692 if (r > 0) {
1693 log_device_debug(device, "Device is renaming, waiting for the interface to be renamed.");
1694 /* TODO:
1695 * What happens when a device is initialized, then soon renamed after that? When we detect
1696 * such, maybe we should cancel or postpone all queued requests for the interface. */
1697 return 0;
1698 }
1699
1700 r = sd_device_get_property_value(device, "ID_NET_MANAGED_BY", &s);
1701 if (r < 0 && r != -ENOENT)
1702 log_device_debug_errno(device, r, "Failed to get ID_NET_MANAGED_BY udev property, ignoring: %m");
1703 if (r >= 0 && !streq(s, "io.systemd.Network")) {
1704 log_device_debug(device, "Interface is requested to be managed by '%s', not managing the interface.", s);
1705 link_set_state(link, LINK_STATE_UNMANAGED);
1706 return 0;
1707 }
1708
1709 r = link_initialized(link, device);
1710 if (r < 0)
1711 link_enter_failed(link);
1712
1713 return 0;
1714 }
1715
1716 static int link_carrier_gained(Link *link) {
1717 bool force_reconfigure;
1718 int r;
1719
1720 assert(link);
1721
1722 r = event_source_disable(link->carrier_lost_timer);
1723 if (r < 0)
1724 log_link_warning_errno(link, r, "Failed to disable carrier lost timer, ignoring: %m");
1725
1726 /* If a wireless interface was connected to an access point, and the SSID is changed (that is,
1727 * both previous_ssid and ssid are non-NULL), then the connected wireless network could be
1728 * changed. So, always reconfigure the link. Which means e.g. the DHCP client will be
1729 * restarted, and the correct network information will be gained.
1730 *
1731 * However, do not reconfigure the wireless interface forcibly if it was not connected to any
1732 * access points previously (previous_ssid is NULL in this case). As, a .network file may be
1733 * already assigned to the interface (in that case, the .network file does not have the SSID=
1734 * setting in the [Match] section), and the interface is already being configured. Of course,
1735 * there may exist another .network file with higher priority and a matching SSID= setting. But
1736 * in that case, link_reconfigure_impl() can handle that without the force_reconfigure flag.
1737 *
1738 * For non-wireless interfaces, we have no way to detect the connected network change. So,
1739 * setting force_reconfigure = false. Note, both ssid and previous_ssid are NULL in that case. */
1740 force_reconfigure = link->previous_ssid && !streq_ptr(link->previous_ssid, link->ssid);
1741 link->previous_ssid = mfree(link->previous_ssid);
1742
1743 /* AP and P2P-GO interfaces may have a new SSID - update the link properties in case a new .network
1744 * profile wants to match on it with SSID= in its [Match] section.
1745 */
1746 if (IN_SET(link->wlan_iftype, NL80211_IFTYPE_AP, NL80211_IFTYPE_P2P_GO)) {
1747 r = link_get_wlan_interface(link);
1748 if (r < 0)
1749 return r;
1750 }
1751
1752 /* At this stage, both wlan and link information should be up-to-date. Hence, it is not necessary to
1753 * call RTM_GETLINK, NL80211_CMD_GET_INTERFACE, or NL80211_CMD_GET_STATION commands, and simply call
1754 * link_reconfigure_impl(). Note, link_reconfigure_impl() returns 1 when the link is reconfigured. */
1755 r = link_reconfigure_impl(link, force_reconfigure);
1756 if (r != 0)
1757 return r;
1758
1759 r = link_handle_bound_by_list(link);
1760 if (r < 0)
1761 return r;
1762
1763 if (link->iftype == ARPHRD_CAN)
1764 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1765 return 0;
1766
1767 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
1768 r = link_acquire_dynamic_conf(link);
1769 if (r < 0)
1770 return r;
1771
1772 r = link_request_static_configs(link);
1773 if (r < 0)
1774 return r;
1775 }
1776
1777 return 0;
1778 }
1779
1780 static int link_carrier_lost_impl(Link *link) {
1781 int r, ret = 0;
1782
1783 assert(link);
1784
1785 link->previous_ssid = mfree(link->previous_ssid);
1786
1787 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1788 return 0;
1789
1790 if (!link->network)
1791 return 0;
1792
1793 r = link_stop_engines(link, false);
1794 if (r < 0)
1795 ret = r;
1796
1797 r = link_drop_managed_config(link);
1798 if (r < 0 && ret >= 0)
1799 ret = r;
1800
1801 return ret;
1802 }
1803
1804 static int link_carrier_lost_handler(sd_event_source *s, uint64_t usec, void *userdata) {
1805 Link *link = ASSERT_PTR(userdata);
1806 int r;
1807
1808 r = link_carrier_lost_impl(link);
1809 if (r < 0) {
1810 log_link_warning_errno(link, r, "Failed to process carrier lost event: %m");
1811 link_enter_failed(link);
1812 }
1813
1814 return 0;
1815 }
1816
1817 static int link_carrier_lost(Link *link) {
1818 uint16_t dhcp_mtu;
1819 usec_t usec;
1820 int r;
1821
1822 assert(link);
1823
1824 r = link_handle_bound_by_list(link);
1825 if (r < 0)
1826 return r;
1827
1828 if (link->iftype == ARPHRD_CAN)
1829 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1830 return 0;
1831
1832 if (!link->network)
1833 return 0;
1834
1835 if (link->network->ignore_carrier_loss_set)
1836 /* If IgnoreCarrierLoss= is explicitly specified, then use the specified value. */
1837 usec = link->network->ignore_carrier_loss_usec;
1838
1839 else if (link->network->bond && link->wlan_iftype > 0)
1840 /* Enslaving wlan interface to a bond disconnects from the connected AP, and causes its
1841 * carrier to be lost. See #19832. */
1842 usec = 3 * USEC_PER_SEC;
1843
1844 else if (link->network->dhcp_use_mtu &&
1845 link->dhcp_lease &&
1846 sd_dhcp_lease_get_mtu(link->dhcp_lease, &dhcp_mtu) >= 0 &&
1847 dhcp_mtu != link->original_mtu)
1848 /* Some drivers reset interfaces when changing MTU. Resetting interfaces by the static
1849 * MTU should not cause any issues, as MTU is changed only once. However, setting MTU
1850 * through DHCP lease causes an infinite loop of resetting the interface. See #18738. */
1851 usec = 5 * USEC_PER_SEC;
1852
1853 else
1854 /* Otherwise, use the implied default value. */
1855 usec = link->network->ignore_carrier_loss_usec;
1856
1857 if (usec == USEC_INFINITY)
1858 return 0;
1859
1860 if (usec == 0)
1861 return link_carrier_lost_impl(link);
1862
1863 return event_reset_time_relative(link->manager->event,
1864 &link->carrier_lost_timer,
1865 CLOCK_BOOTTIME,
1866 usec,
1867 0,
1868 link_carrier_lost_handler,
1869 link,
1870 0,
1871 "link-carrier-loss",
1872 true);
1873 }
1874
1875 static int link_admin_state_up(Link *link) {
1876 int r;
1877
1878 assert(link);
1879
1880 /* This is called every time an interface admin state changes to up;
1881 * specifically, when IFF_UP flag changes from unset to set. */
1882
1883 if (!link->network)
1884 return 0;
1885
1886 if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_DOWN) {
1887 log_link_info(link, "Activation policy is \"always-down\", forcing link down.");
1888 return link_request_to_bring_up_or_down(link, /* up = */ false);
1889 }
1890
1891 /* We set the ipv6 mtu after the device mtu, but the kernel resets
1892 * ipv6 mtu on NETDEV_UP, so we need to reset it. */
1893 r = link_set_ipv6_mtu(link);
1894 if (r < 0)
1895 log_link_warning_errno(link, r, "Cannot set IPv6 MTU, ignoring: %m");
1896
1897 return 0;
1898 }
1899
1900 static int link_admin_state_down(Link *link) {
1901 assert(link);
1902
1903 if (!link->network)
1904 return 0;
1905
1906 if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) {
1907 log_link_info(link, "Activation policy is \"always-up\", forcing link up.");
1908 return link_request_to_bring_up_or_down(link, /* up = */ true);
1909 }
1910
1911 return 0;
1912 }
1913
1914 static bool link_is_enslaved(Link *link) {
1915 if (link->flags & IFF_SLAVE)
1916 return true;
1917
1918 if (link->master_ifindex > 0)
1919 return true;
1920
1921 return false;
1922 }
1923
1924 void link_update_operstate(Link *link, bool also_update_master) {
1925 LinkOperationalState operstate;
1926 LinkCarrierState carrier_state;
1927 LinkAddressState ipv4_address_state, ipv6_address_state, address_state;
1928 LinkOnlineState online_state;
1929 _cleanup_strv_free_ char **p = NULL;
1930 bool changed = false;
1931
1932 assert(link);
1933
1934 if (link->kernel_operstate == IF_OPER_DORMANT)
1935 carrier_state = LINK_CARRIER_STATE_DORMANT;
1936 else if (link_has_carrier(link)) {
1937 if (link_is_enslaved(link))
1938 carrier_state = LINK_CARRIER_STATE_ENSLAVED;
1939 else
1940 carrier_state = LINK_CARRIER_STATE_CARRIER;
1941 } else if (link->flags & IFF_UP)
1942 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
1943 else
1944 carrier_state = LINK_CARRIER_STATE_OFF;
1945
1946 if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
1947 Link *slave;
1948
1949 SET_FOREACH(slave, link->slaves) {
1950 link_update_operstate(slave, false);
1951
1952 if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
1953 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
1954 }
1955 }
1956
1957 link_get_address_states(link, &ipv4_address_state, &ipv6_address_state, &address_state);
1958
1959 /* Mapping of address and carrier state vs operational state
1960 * carrier state
1961 * | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
1962 * ------------------------------------------------------------------------------
1963 * off | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
1964 * address_state degraded | off | no-carrier | dormant | degraded | degraded | enslaved
1965 * routable | off | no-carrier | dormant | routable | routable | routable
1966 */
1967
1968 if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_ROUTABLE)
1969 operstate = LINK_OPERSTATE_ROUTABLE;
1970 else if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_DEGRADED)
1971 operstate = LINK_OPERSTATE_DEGRADED;
1972 else if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
1973 operstate = (LinkOperationalState) carrier_state;
1974 else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
1975 operstate = LINK_OPERSTATE_ROUTABLE;
1976 else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
1977 operstate = LINK_OPERSTATE_DEGRADED;
1978 else
1979 operstate = LINK_OPERSTATE_ENSLAVED;
1980
1981 LinkOperationalStateRange req;
1982 link_required_operstate_for_online(link, &req);
1983
1984 /* Only determine online state for managed links with RequiredForOnline=yes */
1985 if (!link->network || !link->network->required_for_online)
1986 online_state = _LINK_ONLINE_STATE_INVALID;
1987
1988 else if (!operational_state_is_in_range(operstate, &req))
1989 online_state = LINK_ONLINE_STATE_OFFLINE;
1990
1991 else {
1992 AddressFamily required_family = link_required_family_for_online(link);
1993 bool needs_ipv4 = required_family & ADDRESS_FAMILY_IPV4;
1994 bool needs_ipv6 = required_family & ADDRESS_FAMILY_IPV6;
1995
1996 /* The operational state is within the range required for online.
1997 * If a particular address family is also required, we might revert
1998 * to offline in the blocks below. */
1999 online_state = LINK_ONLINE_STATE_ONLINE;
2000
2001 if (req.min >= LINK_OPERSTATE_DEGRADED) {
2002 if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_DEGRADED)
2003 online_state = LINK_ONLINE_STATE_OFFLINE;
2004 if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_DEGRADED)
2005 online_state = LINK_ONLINE_STATE_OFFLINE;
2006 }
2007
2008 if (req.min >= LINK_OPERSTATE_ROUTABLE) {
2009 if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_ROUTABLE)
2010 online_state = LINK_ONLINE_STATE_OFFLINE;
2011 if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_ROUTABLE)
2012 online_state = LINK_ONLINE_STATE_OFFLINE;
2013 }
2014 }
2015
2016 if (link->carrier_state != carrier_state) {
2017 link->carrier_state = carrier_state;
2018 changed = true;
2019 if (strv_extend(&p, "CarrierState") < 0)
2020 log_oom();
2021 }
2022
2023 if (link->address_state != address_state) {
2024 link->address_state = address_state;
2025 changed = true;
2026 if (strv_extend(&p, "AddressState") < 0)
2027 log_oom();
2028 }
2029
2030 if (link->ipv4_address_state != ipv4_address_state) {
2031 link->ipv4_address_state = ipv4_address_state;
2032 changed = true;
2033 if (strv_extend(&p, "IPv4AddressState") < 0)
2034 log_oom();
2035 }
2036
2037 if (link->ipv6_address_state != ipv6_address_state) {
2038 link->ipv6_address_state = ipv6_address_state;
2039 changed = true;
2040 if (strv_extend(&p, "IPv6AddressState") < 0)
2041 log_oom();
2042 }
2043
2044 if (link->operstate != operstate) {
2045 link->operstate = operstate;
2046 changed = true;
2047 if (strv_extend(&p, "OperationalState") < 0)
2048 log_oom();
2049 }
2050
2051 if (link->online_state != online_state) {
2052 link->online_state = online_state;
2053 changed = true;
2054 if (strv_extend(&p, "OnlineState") < 0)
2055 log_oom();
2056 }
2057
2058 if (p)
2059 link_send_changed_strv(link, p);
2060 if (changed)
2061 link_dirty(link);
2062
2063 if (also_update_master) {
2064 Link *master;
2065
2066 if (link_get_master(link, &master) >= 0)
2067 link_update_operstate(master, true);
2068 }
2069 }
2070
2071 #define FLAG_STRING(string, flag, old, new) \
2072 (((old ^ new) & flag) \
2073 ? ((old & flag) ? (" -" string) : (" +" string)) \
2074 : "")
2075
2076 static int link_update_flags(Link *link, sd_netlink_message *message) {
2077 bool link_was_admin_up, had_carrier;
2078 uint8_t operstate;
2079 unsigned flags;
2080 int r;
2081
2082 assert(link);
2083 assert(message);
2084
2085 r = sd_rtnl_message_link_get_flags(message, &flags);
2086 if (r < 0)
2087 return log_link_debug_errno(link, r, "rtnl: failed to read link flags: %m");
2088
2089 r = sd_netlink_message_read_u8(message, IFLA_OPERSTATE, &operstate);
2090 if (r == -ENODATA)
2091 /* If we got a message without operstate, assume the state was unchanged. */
2092 operstate = link->kernel_operstate;
2093 else if (r < 0)
2094 return log_link_debug_errno(link, r, "rtnl: failed to read operational state: %m");
2095
2096 if (link->flags == flags && link->kernel_operstate == operstate)
2097 return 0;
2098
2099 if (link->flags != flags) {
2100 unsigned unknown_flags, unknown_flags_added, unknown_flags_removed;
2101
2102 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",
2103 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
2104 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
2105 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
2106 FLAG_STRING("UP", IFF_UP, link->flags, flags),
2107 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
2108 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
2109 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
2110 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
2111 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
2112 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
2113 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
2114 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
2115 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
2116 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
2117 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
2118 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
2119 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
2120 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
2121 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
2122
2123 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
2124 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
2125 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
2126 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
2127 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
2128 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
2129 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
2130 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
2131
2132 if (unknown_flags_added)
2133 log_link_debug(link, "Unknown link flags gained, ignoring: %#.5x", unknown_flags_added);
2134
2135 if (unknown_flags_removed)
2136 log_link_debug(link, "Unknown link flags lost, ignoring: %#.5x", unknown_flags_removed);
2137 }
2138
2139 link_was_admin_up = link->flags & IFF_UP;
2140 had_carrier = link_has_carrier(link);
2141
2142 link->flags = flags;
2143 link->kernel_operstate = operstate;
2144
2145 link_update_operstate(link, true);
2146
2147 if (!link_was_admin_up && (link->flags & IFF_UP)) {
2148 log_link_info(link, "Link UP");
2149
2150 r = link_admin_state_up(link);
2151 if (r < 0)
2152 return r;
2153 } else if (link_was_admin_up && !(link->flags & IFF_UP)) {
2154 log_link_info(link, "Link DOWN");
2155
2156 r = link_admin_state_down(link);
2157 if (r < 0)
2158 return r;
2159 }
2160
2161 if (!had_carrier && link_has_carrier(link)) {
2162 log_link_info(link, "Gained carrier");
2163
2164 r = link_carrier_gained(link);
2165 if (r < 0)
2166 return r;
2167 } else if (had_carrier && !link_has_carrier(link)) {
2168 log_link_info(link, "Lost carrier");
2169
2170 r = link_carrier_lost(link);
2171 if (r < 0)
2172 return r;
2173 }
2174
2175 return 0;
2176 }
2177
2178 static int link_update_master(Link *link, sd_netlink_message *message) {
2179 int master_ifindex, r;
2180
2181 assert(link);
2182 assert(message);
2183
2184 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t*) &master_ifindex);
2185 if (r == -ENODATA)
2186 return 0;
2187 if (r < 0)
2188 return log_link_debug_errno(link, r, "rtnl: failed to read master ifindex: %m");
2189
2190 if (master_ifindex == link->ifindex)
2191 master_ifindex = 0;
2192
2193 if (master_ifindex != link->master_ifindex) {
2194 if (link->master_ifindex == 0)
2195 log_link_debug(link, "Attached to master interface: %i", master_ifindex);
2196 else if (master_ifindex == 0)
2197 log_link_debug(link, "Detached from master interface: %i", link->master_ifindex);
2198 else
2199 log_link_debug(link, "Master interface changed: %i %s %i", link->master_ifindex,
2200 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), master_ifindex);
2201
2202 link_drop_from_master(link);
2203 link->master_ifindex = master_ifindex;
2204 }
2205
2206 r = link_append_to_master(link);
2207 if (r < 0)
2208 return log_link_debug_errno(link, r, "Failed to append link to master: %m");
2209
2210 return 0;
2211 }
2212
2213 static int link_update_driver(Link *link, sd_netlink_message *message) {
2214 int r;
2215
2216 assert(link);
2217 assert(link->manager);
2218 assert(message);
2219
2220 /* Driver is already read. Assuming the driver is never changed. */
2221 if (link->ethtool_driver_read)
2222 return 0;
2223
2224 /* When udevd is running, read the driver after the interface is initialized by udevd.
2225 * Otherwise, ethtool may not work correctly. See issue #22538.
2226 * When udevd is not running, read the value when the interface is detected. */
2227 if (udev_available() && !link->dev)
2228 return 0;
2229
2230 link->ethtool_driver_read = true;
2231
2232 r = ethtool_get_driver(&link->manager->ethtool_fd, link->ifname, &link->driver);
2233 if (r < 0) {
2234 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
2235 return 0;
2236 }
2237
2238 log_link_debug(link, "Found driver: %s", strna(link->driver));
2239
2240 if (streq_ptr(link->driver, "dsa")) {
2241 uint32_t dsa_master_ifindex = 0;
2242
2243 r = sd_netlink_message_read_u32(message, IFLA_LINK, &dsa_master_ifindex);
2244 if (r < 0 && r != -ENODATA)
2245 return log_link_debug_errno(link, r, "rtnl: failed to read ifindex of the DSA master interface: %m");
2246
2247 if (dsa_master_ifindex > INT_MAX) {
2248 log_link_debug(link, "rtnl: received too large DSA master ifindex (%"PRIu32" > INT_MAX), ignoring.",
2249 dsa_master_ifindex);
2250 dsa_master_ifindex = 0;
2251 }
2252
2253 link->dsa_master_ifindex = (int) dsa_master_ifindex;
2254 }
2255
2256 return 1; /* needs reconfigure */
2257 }
2258
2259 static int link_update_permanent_hardware_address_from_ethtool(Link *link, sd_netlink_message *message) {
2260 int r;
2261
2262 assert(link);
2263 assert(link->manager);
2264 assert(message);
2265
2266 if (link->ethtool_permanent_hw_addr_read)
2267 return 0;
2268
2269 /* When udevd is running, read the permanent hardware address after the interface is
2270 * initialized by udevd. Otherwise, ethtool may not work correctly. See issue #22538.
2271 * When udevd is not running, read the value when the interface is detected. */
2272 if (udev_available() && !link->dev)
2273 return 0;
2274
2275 /* If the interface does not have a hardware address, then it will not have a permanent address either. */
2276 r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, NULL);
2277 if (r == -ENODATA)
2278 return 0;
2279 if (r < 0)
2280 return log_link_debug_errno(link, r, "Failed to read IFLA_ADDRESS attribute: %m");
2281
2282 link->ethtool_permanent_hw_addr_read = true;
2283
2284 r = ethtool_get_permanent_hw_addr(&link->manager->ethtool_fd, link->ifname, &link->permanent_hw_addr);
2285 if (r < 0)
2286 log_link_debug_errno(link, r, "Permanent hardware address not found, continuing without: %m");
2287
2288 return 0;
2289 }
2290
2291 static int link_update_permanent_hardware_address(Link *link, sd_netlink_message *message) {
2292 int r;
2293
2294 assert(link);
2295 assert(link->manager);
2296 assert(message);
2297
2298 if (link->permanent_hw_addr.length > 0)
2299 return 0;
2300
2301 r = netlink_message_read_hw_addr(message, IFLA_PERM_ADDRESS, &link->permanent_hw_addr);
2302 if (r < 0) {
2303 if (r != -ENODATA)
2304 return log_link_debug_errno(link, r, "Failed to read IFLA_PERM_ADDRESS attribute: %m");
2305
2306 /* Fallback to ethtool for older kernels. */
2307 r = link_update_permanent_hardware_address_from_ethtool(link, message);
2308 if (r < 0)
2309 return r;
2310 }
2311
2312 if (link->permanent_hw_addr.length > 0)
2313 log_link_debug(link, "Saved permanent hardware address: %s", HW_ADDR_TO_STR(&link->permanent_hw_addr));
2314
2315 return 1; /* needs reconfigure */
2316 }
2317
2318 static int link_update_hardware_address(Link *link, sd_netlink_message *message) {
2319 struct hw_addr_data addr;
2320 int r;
2321
2322 assert(link);
2323 assert(message);
2324
2325 r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr);
2326 if (r < 0 && r != -ENODATA)
2327 return log_link_debug_errno(link, r, "rtnl: failed to read broadcast address: %m");
2328
2329 r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &addr);
2330 if (r == -ENODATA)
2331 return 0;
2332 if (r < 0)
2333 return log_link_debug_errno(link, r, "rtnl: failed to read hardware address: %m");
2334
2335 if (hw_addr_equal(&link->hw_addr, &addr))
2336 return 0;
2337
2338 if (link->hw_addr.length == 0)
2339 log_link_debug(link, "Saved hardware address: %s", HW_ADDR_TO_STR(&addr));
2340 else {
2341 log_link_debug(link, "Hardware address is changed: %s %s %s",
2342 HW_ADDR_TO_STR(&link->hw_addr),
2343 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT),
2344 HW_ADDR_TO_STR(&addr));
2345
2346 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
2347 }
2348
2349 link->hw_addr = addr;
2350
2351 if (!hw_addr_is_null(&link->hw_addr)) {
2352 r = hashmap_ensure_put(&link->manager->links_by_hw_addr, &hw_addr_hash_ops, &link->hw_addr, link);
2353 if (r == -EEXIST && streq_ptr(link->kind, "bond"))
2354 /* bonding master and its slaves have the same hardware address. */
2355 r = hashmap_replace(link->manager->links_by_hw_addr, &link->hw_addr, link);
2356 if (r < 0)
2357 log_link_debug_errno(link, r, "Failed to manage link by its new hardware address, ignoring: %m");
2358 }
2359
2360 r = ipv4acd_update_mac(link);
2361 if (r < 0)
2362 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m");
2363
2364 r = ipv4ll_update_mac(link);
2365 if (r < 0)
2366 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
2367
2368 r = dhcp4_update_mac(link);
2369 if (r < 0)
2370 return log_link_debug_errno(link, r, "Could not update MAC address in DHCP client: %m");
2371
2372 r = dhcp6_update_mac(link);
2373 if (r < 0)
2374 return log_link_debug_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
2375
2376 r = radv_update_mac(link);
2377 if (r < 0)
2378 return log_link_debug_errno(link, r, "Could not update MAC address for Router Advertisement: %m");
2379
2380 if (link->ndisc && link->hw_addr.length == ETH_ALEN) {
2381 r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether);
2382 if (r < 0)
2383 return log_link_debug_errno(link, r, "Could not update MAC for NDisc: %m");
2384 }
2385
2386 if (link->lldp_rx) {
2387 r = sd_lldp_rx_set_filter_address(link->lldp_rx, &link->hw_addr.ether);
2388 if (r < 0)
2389 return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Rx: %m");
2390 }
2391
2392 if (link->lldp_tx) {
2393 r = sd_lldp_tx_set_hwaddr(link->lldp_tx, &link->hw_addr.ether);
2394 if (r < 0)
2395 return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Tx: %m");
2396 }
2397
2398 return 1; /* needs reconfigure */
2399 }
2400
2401 static int link_update_mtu(Link *link, sd_netlink_message *message) {
2402 uint32_t mtu, min_mtu = 0, max_mtu = UINT32_MAX;
2403 int r;
2404
2405 assert(link);
2406 assert(message);
2407
2408 r = sd_netlink_message_read_u32(message, IFLA_MTU, &mtu);
2409 if (r == -ENODATA)
2410 return 0;
2411 if (r < 0)
2412 return log_link_debug_errno(link, r, "rtnl: failed to read MTU in RTM_NEWLINK message: %m");
2413 if (mtu == 0)
2414 return 0;
2415
2416 r = sd_netlink_message_read_u32(message, IFLA_MIN_MTU, &min_mtu);
2417 if (r < 0 && r != -ENODATA)
2418 return log_link_debug_errno(link, r, "rtnl: failed to read minimum MTU in RTM_NEWLINK message: %m");
2419
2420 r = sd_netlink_message_read_u32(message, IFLA_MAX_MTU, &max_mtu);
2421 if (r < 0 && r != -ENODATA)
2422 return log_link_debug_errno(link, r, "rtnl: failed to read maximum MTU in RTM_NEWLINK message: %m");
2423
2424 if (max_mtu == 0)
2425 max_mtu = UINT32_MAX;
2426
2427 link->min_mtu = min_mtu;
2428 link->max_mtu = max_mtu;
2429
2430 if (link->original_mtu == 0) {
2431 link->original_mtu = mtu;
2432 log_link_debug(link, "Saved original MTU %" PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2433 link->original_mtu, link->min_mtu, link->max_mtu);
2434 }
2435
2436 if (link->mtu == mtu)
2437 return 0;
2438
2439 if (link->mtu != 0)
2440 log_link_debug(link, "MTU is changed: %"PRIu32" %s %"PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2441 link->mtu, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), mtu,
2442 link->min_mtu, link->max_mtu);
2443
2444 link->mtu = mtu;
2445
2446 if (link->dhcp_client) {
2447 r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
2448 if (r < 0)
2449 return log_link_debug_errno(link, r, "Could not update MTU in DHCP client: %m");
2450 }
2451
2452 if (link->radv) {
2453 r = sd_radv_set_mtu(link->radv, link->mtu);
2454 if (r < 0)
2455 return log_link_debug_errno(link, r, "Could not set MTU for Router Advertisement: %m");
2456 }
2457
2458 return 0;
2459 }
2460
2461 static int link_update_alternative_names(Link *link, sd_netlink_message *message) {
2462 _cleanup_strv_free_ char **altnames = NULL;
2463 int r;
2464
2465 assert(link);
2466 assert(message);
2467
2468 r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &altnames);
2469 if (r == -ENODATA)
2470 /* The message does not have IFLA_PROP_LIST container attribute. It does not mean the
2471 * interface has no alternative name. */
2472 return 0;
2473 if (r < 0)
2474 return log_link_debug_errno(link, r, "rtnl: failed to read alternative names: %m");
2475
2476 if (strv_equal(altnames, link->alternative_names))
2477 return 0;
2478
2479 STRV_FOREACH(n, link->alternative_names)
2480 hashmap_remove(link->manager->links_by_name, *n);
2481
2482 strv_free_and_replace(link->alternative_names, altnames);
2483
2484 STRV_FOREACH(n, link->alternative_names) {
2485 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, *n, link);
2486 if (r < 0)
2487 return log_link_debug_errno(link, r, "Failed to manage link by its new alternative names: %m");
2488 }
2489
2490 return 1; /* needs reconfigure */
2491 }
2492
2493 static int link_update_name(Link *link, sd_netlink_message *message) {
2494 char ifname_from_index[IF_NAMESIZE];
2495 const char *ifname;
2496 int r;
2497
2498 assert(link);
2499 assert(message);
2500
2501 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
2502 if (r == -ENODATA)
2503 /* Hmm?? But ok. */
2504 return 0;
2505 if (r < 0)
2506 return log_link_debug_errno(link, r, "Failed to read interface name in RTM_NEWLINK message: %m");
2507
2508 if (streq(ifname, link->ifname))
2509 return 0;
2510
2511 r = format_ifname(link->ifindex, ifname_from_index);
2512 if (r < 0)
2513 return log_link_debug_errno(link, r, "Could not get interface name for index %i.", link->ifindex);
2514
2515 if (!streq(ifname, ifname_from_index)) {
2516 log_link_debug(link, "New interface name '%s' received from the kernel does not correspond "
2517 "with the name currently configured on the actual interface '%s'. Ignoring.",
2518 ifname, ifname_from_index);
2519 return 0;
2520 }
2521
2522 log_link_info(link, "Interface name change detected, renamed to %s.", ifname);
2523
2524 hashmap_remove(link->manager->links_by_name, link->ifname);
2525
2526 r = free_and_strdup(&link->ifname, ifname);
2527 if (r < 0)
2528 return log_oom_debug();
2529
2530 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, link->ifname, link);
2531 if (r < 0)
2532 return log_link_debug_errno(link, r, "Failed to manage link by its new name: %m");
2533
2534 if (link->dhcp_client) {
2535 r = sd_dhcp_client_set_ifname(link->dhcp_client, link->ifname);
2536 if (r < 0)
2537 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP client: %m");
2538 }
2539
2540 if (link->dhcp6_client) {
2541 r = sd_dhcp6_client_set_ifname(link->dhcp6_client, link->ifname);
2542 if (r < 0)
2543 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP6 client: %m");
2544 }
2545
2546 if (link->ndisc) {
2547 r = sd_ndisc_set_ifname(link->ndisc, link->ifname);
2548 if (r < 0)
2549 return log_link_debug_errno(link, r, "Failed to update interface name in NDisc: %m");
2550 }
2551
2552 if (link->dhcp_server) {
2553 r = sd_dhcp_server_set_ifname(link->dhcp_server, link->ifname);
2554 if (r < 0)
2555 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP server: %m");
2556 }
2557
2558 if (link->radv) {
2559 r = sd_radv_set_ifname(link->radv, link->ifname);
2560 if (r < 0)
2561 return log_link_debug_errno(link, r, "Failed to update interface name in Router Advertisement: %m");
2562 }
2563
2564 if (link->lldp_rx) {
2565 r = sd_lldp_rx_set_ifname(link->lldp_rx, link->ifname);
2566 if (r < 0)
2567 return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Rx: %m");
2568 }
2569
2570 if (link->lldp_tx) {
2571 r = sd_lldp_tx_set_ifname(link->lldp_tx, link->ifname);
2572 if (r < 0)
2573 return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Tx: %m");
2574 }
2575
2576 if (link->ipv4ll) {
2577 r = sd_ipv4ll_set_ifname(link->ipv4ll, link->ifname);
2578 if (r < 0)
2579 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4LL client: %m");
2580 }
2581
2582 r = ipv4acd_set_ifname(link);
2583 if (r < 0)
2584 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4ACD client: %m");
2585
2586 return 1; /* needs reconfigure */
2587 }
2588
2589 static int link_update(Link *link, sd_netlink_message *message) {
2590 bool needs_reconfigure = false;
2591 int r;
2592
2593 assert(link);
2594 assert(message);
2595
2596 r = link_update_name(link, message);
2597 if (r < 0)
2598 return r;
2599 needs_reconfigure = needs_reconfigure || r > 0;
2600
2601 r = link_update_alternative_names(link, message);
2602 if (r < 0)
2603 return r;
2604 needs_reconfigure = needs_reconfigure || r > 0;
2605
2606 r = link_update_mtu(link, message);
2607 if (r < 0)
2608 return r;
2609
2610 r = link_update_driver(link, message);
2611 if (r < 0)
2612 return r;
2613 needs_reconfigure = needs_reconfigure || r > 0;
2614
2615 r = link_update_permanent_hardware_address(link, message);
2616 if (r < 0)
2617 return r;
2618 needs_reconfigure = needs_reconfigure || r > 0;
2619
2620 r = link_update_hardware_address(link, message);
2621 if (r < 0)
2622 return r;
2623 needs_reconfigure = needs_reconfigure || r > 0;
2624
2625 r = link_update_master(link, message);
2626 if (r < 0)
2627 return r;
2628
2629 r = link_update_ipv6ll_addrgen_mode(link, message);
2630 if (r < 0)
2631 return r;
2632
2633 r = link_update_flags(link, message);
2634 if (r < 0)
2635 return r;
2636
2637 r = link_update_bridge_vlan(link, message);
2638 if (r < 0)
2639 return r;
2640
2641 return needs_reconfigure;
2642 }
2643
2644 static Link *link_drop_or_unref(Link *link) {
2645 if (!link)
2646 return NULL;
2647 if (!link->manager)
2648 return link_unref(link);
2649 return link_drop(link);
2650 }
2651
2652 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_drop_or_unref);
2653
2654 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
2655 _cleanup_free_ char *ifname = NULL, *kind = NULL, *state_file = NULL, *lease_file = NULL;
2656 _cleanup_(link_drop_or_unrefp) Link *link = NULL;
2657 unsigned short iftype;
2658 int r, ifindex;
2659
2660 assert(manager);
2661 assert(message);
2662 assert(ret);
2663
2664 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2665 if (r < 0)
2666 return log_debug_errno(r, "rtnl: failed to read ifindex from link message: %m");
2667 else if (ifindex <= 0)
2668 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "rtnl: received link message without valid ifindex.");
2669
2670 r = sd_rtnl_message_link_get_type(message, &iftype);
2671 if (r < 0)
2672 return log_debug_errno(r, "rtnl: failed to read interface type from link message: %m");
2673
2674 r = sd_netlink_message_read_string_strdup(message, IFLA_IFNAME, &ifname);
2675 if (r < 0)
2676 return log_debug_errno(r, "rtnl: failed to read interface name from link message: %m");
2677
2678 /* check for link kind */
2679 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
2680 if (r >= 0) {
2681 r = sd_netlink_message_read_string_strdup(message, IFLA_INFO_KIND, &kind);
2682 if (r < 0 && r != -ENODATA)
2683 return log_debug_errno(r, "rtnl: failed to read interface kind from link message: %m");
2684 r = sd_netlink_message_exit_container(message);
2685 if (r < 0)
2686 return log_debug_errno(r, "rtnl: failed to exit IFLA_LINKINFO container: %m");
2687 }
2688
2689 if (!manager->test_mode) {
2690 /* Do not update state files when running in test mode. */
2691 if (asprintf(&state_file, "/run/systemd/netif/links/%d", ifindex) < 0)
2692 return log_oom_debug();
2693
2694 if (asprintf(&lease_file, "/run/systemd/netif/leases/%d", ifindex) < 0)
2695 return log_oom_debug();
2696 }
2697
2698 link = new(Link, 1);
2699 if (!link)
2700 return -ENOMEM;
2701
2702 *link = (Link) {
2703 .n_ref = 1,
2704 .state = LINK_STATE_PENDING,
2705 .online_state = _LINK_ONLINE_STATE_INVALID,
2706 .automatic_reconfigure_ratelimit = (const RateLimit) { .interval = 10 * USEC_PER_SEC, .burst = 5 },
2707 .ifindex = ifindex,
2708 .iftype = iftype,
2709 .ifname = TAKE_PTR(ifname),
2710 .kind = TAKE_PTR(kind),
2711
2712 .bridge_vlan_pvid = UINT16_MAX,
2713
2714 .ipv6ll_address_gen_mode = _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_INVALID,
2715
2716 .state_file = TAKE_PTR(state_file),
2717 .lease_file = TAKE_PTR(lease_file),
2718
2719 .n_dns = UINT_MAX,
2720 .dns_default_route = -1,
2721 .llmnr = _RESOLVE_SUPPORT_INVALID,
2722 .mdns = _RESOLVE_SUPPORT_INVALID,
2723 .dnssec_mode = _DNSSEC_MODE_INVALID,
2724 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
2725 };
2726
2727 r = hashmap_ensure_put(&manager->links_by_index, NULL, INT_TO_PTR(link->ifindex), link);
2728 if (r < 0)
2729 return log_link_debug_errno(link, r, "Failed to store link into manager: %m");
2730
2731 link->manager = manager;
2732
2733 r = hashmap_ensure_put(&manager->links_by_name, &string_hash_ops, link->ifname, link);
2734 if (r < 0)
2735 return log_link_debug_errno(link, r, "Failed to manage link by its interface name: %m");
2736
2737 log_link_debug(link, "Saved new link: ifindex=%i, iftype=%s(%u), kind=%s",
2738 link->ifindex, strna(arphrd_to_name(link->iftype)), link->iftype, strna(link->kind));
2739
2740 /* If contained in this set, the link is wireless and the corresponding NL80211_CMD_NEW_INTERFACE
2741 * message arrived too early. Request the wireless link information again.
2742 */
2743 if (set_remove(manager->new_wlan_ifindices, INT_TO_PTR(link->ifindex))) {
2744 r = link_get_wlan_interface(link);
2745 if (r < 0)
2746 log_link_warning_errno(link, r, "Failed to get wireless interface, ignoring: %m");
2747 }
2748
2749 *ret = TAKE_PTR(link);
2750 return 0;
2751 }
2752
2753 int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, Manager *manager) {
2754 Link *link = NULL;
2755 NetDev *netdev = NULL;
2756 uint16_t type;
2757 const char *name;
2758 int r, ifindex;
2759
2760 assert(rtnl);
2761 assert(message);
2762 assert(manager);
2763
2764 if (sd_netlink_message_is_error(message)) {
2765 r = sd_netlink_message_get_errno(message);
2766 if (r < 0)
2767 log_message_warning_errno(message, r, "rtnl: Could not receive link message, ignoring");
2768
2769 return 0;
2770 }
2771
2772 r = sd_netlink_message_get_type(message, &type);
2773 if (r < 0) {
2774 log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
2775 return 0;
2776 } else if (!IN_SET(type, RTM_NEWLINK, RTM_DELLINK)) {
2777 log_warning("rtnl: Received unexpected message type %u when processing link, ignoring.", type);
2778 return 0;
2779 }
2780
2781 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2782 if (r < 0) {
2783 log_warning_errno(r, "rtnl: Could not get ifindex from link message, ignoring: %m");
2784 return 0;
2785 } else if (ifindex <= 0) {
2786 log_warning("rtnl: received link message with invalid ifindex %d, ignoring.", ifindex);
2787 return 0;
2788 }
2789
2790 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
2791 if (r < 0) {
2792 log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
2793 return 0;
2794 }
2795
2796 (void) link_get_by_index(manager, ifindex, &link);
2797 (void) netdev_get(manager, name, &netdev);
2798
2799 switch (type) {
2800 case RTM_NEWLINK:
2801 if (netdev) {
2802 /* netdev exists, so make sure the ifindex matches */
2803 r = netdev_set_ifindex(netdev, message);
2804 if (r < 0) {
2805 log_netdev_warning_errno(netdev, r, "Could not process new link message for netdev, ignoring: %m");
2806 return 0;
2807 }
2808 }
2809
2810 if (!link) {
2811 /* link is new, so add it */
2812 r = link_new(manager, message, &link);
2813 if (r < 0) {
2814 log_warning_errno(r, "Could not process new link message: %m");
2815 return 0;
2816 }
2817
2818 r = link_update(link, message);
2819 if (r < 0) {
2820 log_link_warning_errno(link, r, "Could not process link message: %m");
2821 link_enter_failed(link);
2822 return 0;
2823 }
2824
2825 r = link_check_initialized(link);
2826 if (r < 0) {
2827 log_link_warning_errno(link, r, "Failed to check link is initialized: %m");
2828 link_enter_failed(link);
2829 return 0;
2830 }
2831 } else {
2832 r = link_update(link, message);
2833 if (r < 0) {
2834 log_link_warning_errno(link, r, "Could not process link message: %m");
2835 link_enter_failed(link);
2836 return 0;
2837 }
2838 if (r > 0) {
2839 r = link_reconfigure_impl(link, /* force = */ false);
2840 if (r < 0) {
2841 log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
2842 link_enter_failed(link);
2843 return 0;
2844 }
2845 }
2846 }
2847 break;
2848
2849 case RTM_DELLINK:
2850 link_drop(link);
2851 netdev_drop(netdev);
2852 break;
2853
2854 default:
2855 assert_not_reached();
2856 }
2857
2858 return 1;
2859 }
2860
2861 int link_getlink_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, const char *error_msg) {
2862 uint16_t message_type;
2863 int r;
2864
2865 assert(m);
2866 assert(link);
2867 assert(error_msg);
2868
2869 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2870 return 0;
2871
2872 r = sd_netlink_message_get_errno(m);
2873 if (r < 0) {
2874 log_link_message_warning_errno(link, m, r, error_msg);
2875 link_enter_failed(link);
2876 return 0;
2877 }
2878
2879 r = sd_netlink_message_get_type(m, &message_type);
2880 if (r < 0) {
2881 log_link_debug_errno(link, r, "rtnl: failed to read link message type, ignoring: %m");
2882 return 0;
2883 }
2884 if (message_type != RTM_NEWLINK) {
2885 log_link_debug(link, "rtnl: received invalid link message type, ignoring.");
2886 return 0;
2887 }
2888
2889 r = link_update(link, m);
2890 if (r < 0) {
2891 link_enter_failed(link);
2892 return 0;
2893 }
2894
2895 return 1;
2896 }
2897
2898 int link_call_getlink(Link *link, link_netlink_message_handler_t callback) {
2899 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2900 int r;
2901
2902 assert(link);
2903 assert(link->manager);
2904 assert(link->manager->rtnl);
2905 assert(callback);
2906
2907 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
2908 if (r < 0)
2909 return r;
2910
2911 r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
2912 link_netlink_destroy_callback, link);
2913 if (r < 0)
2914 return r;
2915
2916 link_ref(link);
2917 return 0;
2918 }
2919
2920 static const char* const link_state_table[_LINK_STATE_MAX] = {
2921 [LINK_STATE_PENDING] = "pending",
2922 [LINK_STATE_INITIALIZED] = "initialized",
2923 [LINK_STATE_CONFIGURING] = "configuring",
2924 [LINK_STATE_CONFIGURED] = "configured",
2925 [LINK_STATE_UNMANAGED] = "unmanaged",
2926 [LINK_STATE_FAILED] = "failed",
2927 [LINK_STATE_LINGER] = "linger",
2928 };
2929
2930 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
2931
2932 int link_flags_to_string_alloc(uint32_t flags, char **ret) {
2933 _cleanup_free_ char *str = NULL;
2934 static const char* map[] = {
2935 [LOG2U(IFF_UP)] = "up", /* interface is up. */
2936 [LOG2U(IFF_BROADCAST)] = "broadcast", /* broadcast address valid. */
2937 [LOG2U(IFF_DEBUG)] = "debug", /* turn on debugging. */
2938 [LOG2U(IFF_LOOPBACK)] = "loopback", /* interface is a loopback net. */
2939 [LOG2U(IFF_POINTOPOINT)] = "point-to-point", /* interface has p-p link. */
2940 [LOG2U(IFF_NOTRAILERS)] = "no-trailers", /* avoid use of trailers. */
2941 [LOG2U(IFF_RUNNING)] = "running", /* interface RFC2863 OPER_UP. */
2942 [LOG2U(IFF_NOARP)] = "no-arp", /* no ARP protocol. */
2943 [LOG2U(IFF_PROMISC)] = "promiscuous", /* receive all packets. */
2944 [LOG2U(IFF_ALLMULTI)] = "all-multicast", /* receive all multicast packets. */
2945 [LOG2U(IFF_MASTER)] = "master", /* master of a load balancer. */
2946 [LOG2U(IFF_SLAVE)] = "slave", /* slave of a load balancer. */
2947 [LOG2U(IFF_MULTICAST)] = "multicast", /* supports multicast. */
2948 [LOG2U(IFF_PORTSEL)] = "portsel", /* can set media type. */
2949 [LOG2U(IFF_AUTOMEDIA)] = "auto-media", /* auto media select active. */
2950 [LOG2U(IFF_DYNAMIC)] = "dynamic", /* dialup device with changing addresses. */
2951 [LOG2U(IFF_LOWER_UP)] = "lower-up", /* driver signals L1 up. */
2952 [LOG2U(IFF_DORMANT)] = "dormant", /* driver signals dormant. */
2953 [LOG2U(IFF_ECHO)] = "echo", /* echo sent packets. */
2954 };
2955
2956 assert(ret);
2957
2958 for (size_t i = 0; i < ELEMENTSOF(map); i++)
2959 if (FLAGS_SET(flags, 1 << i) && map[i])
2960 if (!strextend_with_separator(&str, ",", map[i]))
2961 return -ENOMEM;
2962
2963 *ret = TAKE_PTR(str);
2964 return 0;
2965 }
2966
2967 static const char * const kernel_operstate_table[] = {
2968 [IF_OPER_UNKNOWN] = "unknown",
2969 [IF_OPER_NOTPRESENT] = "not-present",
2970 [IF_OPER_DOWN] = "down",
2971 [IF_OPER_LOWERLAYERDOWN] = "lower-layer-down",
2972 [IF_OPER_TESTING] = "testing",
2973 [IF_OPER_DORMANT] = "dormant",
2974 [IF_OPER_UP] = "up",
2975 };
2976
2977 DEFINE_STRING_TABLE_LOOKUP_TO_STRING(kernel_operstate, int);
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