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Merge pull request #31176 from yuwata/network-required-for-online
[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->lldp_file);
276 unlink_and_free(link->state_file);
277
278 sd_device_unref(link->dev);
279 netdev_unref(link->netdev);
280
281 hashmap_free(link->bound_to_links);
282 hashmap_free(link->bound_by_links);
283
284 set_free_with_destructor(link->slaves, link_unref);
285
286 network_unref(link->network);
287
288 sd_event_source_disable_unref(link->carrier_lost_timer);
289
290 return mfree(link);
291 }
292
293 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
294
295 int link_get_by_index(Manager *m, int ifindex, Link **ret) {
296 Link *link;
297
298 assert(m);
299
300 if (ifindex <= 0)
301 return -EINVAL;
302
303 link = hashmap_get(m->links_by_index, INT_TO_PTR(ifindex));
304 if (!link)
305 return -ENODEV;
306
307 if (ret)
308 *ret = link;
309 return 0;
310 }
311
312 int link_get_by_name(Manager *m, const char *ifname, Link **ret) {
313 Link *link;
314
315 assert(m);
316 assert(ifname);
317
318 link = hashmap_get(m->links_by_name, ifname);
319 if (!link)
320 return -ENODEV;
321
322 if (ret)
323 *ret = link;
324 return 0;
325 }
326
327 int link_get_by_hw_addr(Manager *m, const struct hw_addr_data *hw_addr, Link **ret) {
328 Link *link;
329
330 assert(m);
331 assert(hw_addr);
332
333 link = hashmap_get(m->links_by_hw_addr, hw_addr);
334 if (!link)
335 return -ENODEV;
336
337 if (ret)
338 *ret = link;
339 return 0;
340 }
341
342 int link_get_master(Link *link, Link **ret) {
343 assert(link);
344 assert(link->manager);
345 assert(ret);
346
347 if (link->master_ifindex <= 0 || link->master_ifindex == link->ifindex)
348 return -ENODEV;
349
350 return link_get_by_index(link->manager, link->master_ifindex, ret);
351 }
352
353 void link_set_state(Link *link, LinkState state) {
354 assert(link);
355
356 if (link->state == state)
357 return;
358
359 log_link_debug(link, "State changed: %s -> %s",
360 link_state_to_string(link->state),
361 link_state_to_string(state));
362
363 link->state = state;
364
365 link_send_changed(link, "AdministrativeState", NULL);
366 link_dirty(link);
367 }
368
369 int link_stop_engines(Link *link, bool may_keep_dhcp) {
370 int r, ret = 0;
371
372 assert(link);
373 assert(link->manager);
374 assert(link->manager->event);
375
376 bool keep_dhcp = may_keep_dhcp &&
377 link->network &&
378 !link->network->dhcp_send_decline && /* IPv4 ACD for the DHCPv4 address is running. */
379 (link->manager->restarting ||
380 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
381
382 if (!keep_dhcp) {
383 r = sd_dhcp_client_stop(link->dhcp_client);
384 if (r < 0)
385 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv4 client: %m"));
386 }
387
388 r = sd_dhcp_server_stop(link->dhcp_server);
389 if (r < 0)
390 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv4 server: %m"));
391
392 r = sd_lldp_rx_stop(link->lldp_rx);
393 if (r < 0)
394 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop LLDP Rx: %m"));
395
396 r = sd_lldp_tx_stop(link->lldp_tx);
397 if (r < 0)
398 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop LLDP Tx: %m"));
399
400 r = sd_ipv4ll_stop(link->ipv4ll);
401 if (r < 0)
402 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv4 link-local: %m"));
403
404 r = ipv4acd_stop(link);
405 if (r < 0)
406 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv4 ACD client: %m"));
407
408 r = sd_dhcp6_client_stop(link->dhcp6_client);
409 if (r < 0)
410 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv6 client: %m"));
411
412 r = dhcp_pd_remove(link, /* only_marked = */ false);
413 if (r < 0)
414 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not remove DHCPv6 PD addresses and routes: %m"));
415
416 r = ndisc_stop(link);
417 if (r < 0)
418 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv6 Router Discovery: %m"));
419
420 ndisc_flush(link);
421
422 r = sd_radv_stop(link->radv);
423 if (r < 0)
424 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv6 Router Advertisement: %m"));
425
426 return ret;
427 }
428
429 void link_enter_failed(Link *link) {
430 int r;
431
432 assert(link);
433
434 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
435 return;
436
437 log_link_warning(link, "Failed");
438
439 link_set_state(link, LINK_STATE_FAILED);
440
441 if (!ratelimit_below(&link->automatic_reconfigure_ratelimit)) {
442 log_link_warning(link, "The interface entered the failed state frequently, refusing to reconfigure it automatically.");
443 goto stop;
444 }
445
446 log_link_info(link, "Trying to reconfigure the interface.");
447 r = link_reconfigure(link, /* force = */ true);
448 if (r < 0) {
449 log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
450 goto stop;
451 }
452
453 return;
454
455 stop:
456 (void) link_stop_engines(link, /* may_keep_dhcp = */ false);
457 }
458
459 void link_check_ready(Link *link) {
460 Address *a;
461
462 assert(link);
463
464 if (link->state == LINK_STATE_CONFIGURED)
465 return;
466
467 if (link->state != LINK_STATE_CONFIGURING)
468 return (void) log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state));
469
470 if (!link->network)
471 return (void) log_link_debug(link, "%s(): link is unmanaged.", __func__);
472
473 if (!link->tc_configured)
474 return (void) log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
475
476 if (link->set_link_messages > 0)
477 return (void) log_link_debug(link, "%s(): link layer is configuring.", __func__);
478
479 if (!link->activated)
480 return (void) log_link_debug(link, "%s(): link is not activated.", __func__);
481
482 if (link->iftype == ARPHRD_CAN)
483 /* let's shortcut things for CAN which doesn't need most of checks below. */
484 goto ready;
485
486 if (!link->stacked_netdevs_created)
487 return (void) log_link_debug(link, "%s(): stacked netdevs are not created.", __func__);
488
489 if (!link->static_addresses_configured)
490 return (void) log_link_debug(link, "%s(): static addresses are not configured.", __func__);
491
492 if (!link->static_address_labels_configured)
493 return (void) log_link_debug(link, "%s(): static address labels are not configured.", __func__);
494
495 if (!link->static_bridge_fdb_configured)
496 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
497
498 if (!link->static_bridge_mdb_configured)
499 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
500
501 if (!link->static_ipv6_proxy_ndp_configured)
502 return (void) log_link_debug(link, "%s(): static IPv6 proxy NDP addresses are not configured.", __func__);
503
504 if (!link->static_neighbors_configured)
505 return (void) log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
506
507 if (!link->static_nexthops_configured)
508 return (void) log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
509
510 if (!link->static_routes_configured)
511 return (void) log_link_debug(link, "%s(): static routes are not configured.", __func__);
512
513 if (!link->static_routing_policy_rules_configured)
514 return (void) log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
515
516 if (!link->sr_iov_configured)
517 return (void) log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
518
519 /* IPv6LL is assigned after the link gains its carrier. */
520 if (!link->network->configure_without_carrier &&
521 link_ipv6ll_enabled(link) &&
522 !in6_addr_is_set(&link->ipv6ll_address))
523 return (void) log_link_debug(link, "%s(): IPv6LL is not configured yet.", __func__);
524
525 /* All static addresses must be ready. */
526 bool has_static_address = false;
527 SET_FOREACH(a, link->addresses) {
528 if (a->source != NETWORK_CONFIG_SOURCE_STATIC)
529 continue;
530 if (!address_is_ready(a))
531 return (void) log_link_debug(link, "%s(): static address %s is not ready.", __func__,
532 IN_ADDR_PREFIX_TO_STRING(a->family, &a->in_addr, a->prefixlen));
533 has_static_address = true;
534 }
535
536 /* If at least one static address is requested, do not request that dynamic addressing protocols are finished. */
537 if (has_static_address)
538 goto ready;
539
540 /* If no dynamic addressing protocol enabled, assume the interface is ready.
541 * Note, ignore NDisc when ConfigureWithoutCarrier= is enabled, as IPv6AcceptRA= is enabled by default. */
542 if (!link_ipv4ll_enabled(link) && !link_dhcp4_enabled(link) &&
543 !link_dhcp6_enabled(link) && !link_dhcp_pd_is_enabled(link) &&
544 (link->network->configure_without_carrier || !link_ipv6_accept_ra_enabled(link)))
545 goto ready;
546
547 bool ipv4ll_ready =
548 link_ipv4ll_enabled(link) && link->ipv4ll_address_configured &&
549 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_IPV4LL);
550 bool dhcp4_ready =
551 link_dhcp4_enabled(link) && link->dhcp4_configured &&
552 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP4);
553 bool dhcp6_ready =
554 link_dhcp6_enabled(link) && link->dhcp6_configured &&
555 (!link->network->dhcp6_use_address ||
556 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP6));
557 bool dhcp_pd_ready =
558 link_dhcp_pd_is_enabled(link) && link->dhcp_pd_configured &&
559 (!link->network->dhcp_pd_assign ||
560 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP_PD));
561 bool ndisc_ready =
562 link_ipv6_accept_ra_enabled(link) && link->ndisc_configured &&
563 (!link->network->ipv6_accept_ra_use_autonomous_prefix ||
564 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_NDISC));
565
566 /* If the uplink for PD is self, then request the corresponding DHCP protocol is also ready. */
567 if (dhcp_pd_is_uplink(link, link, /* accept_auto = */ false)) {
568 if (link_dhcp4_enabled(link) && link->network->dhcp_use_6rd &&
569 sd_dhcp_lease_has_6rd(link->dhcp_lease)) {
570 if (!dhcp4_ready)
571 return (void) log_link_debug(link, "%s(): DHCPv4 6rd prefix is assigned, but DHCPv4 protocol is not finished yet.", __func__);
572 if (!dhcp_pd_ready)
573 return (void) log_link_debug(link, "%s(): DHCPv4 is finished, but prefix acquired by DHCPv4-6rd is not assigned yet.", __func__);
574 }
575
576 if (link_dhcp6_enabled(link) && link->network->dhcp6_use_pd_prefix &&
577 sd_dhcp6_lease_has_pd_prefix(link->dhcp6_lease)) {
578 if (!dhcp6_ready)
579 return (void) log_link_debug(link, "%s(): DHCPv6 IA_PD prefix is assigned, but DHCPv6 protocol is not finished yet.", __func__);
580 if (!dhcp_pd_ready)
581 return (void) log_link_debug(link, "%s(): DHCPv6 is finished, but prefix acquired by DHCPv6 IA_PD is not assigned yet.", __func__);
582 }
583 }
584
585 /* At least one dynamic addressing protocol is finished. */
586 if (!ipv4ll_ready && !dhcp4_ready && !dhcp6_ready && !dhcp_pd_ready && !ndisc_ready)
587 return (void) log_link_debug(link, "%s(): dynamic addressing protocols are enabled but none of them finished yet.", __func__);
588
589 log_link_debug(link, "%s(): IPv4LL:%s DHCPv4:%s DHCPv6:%s DHCP-PD:%s NDisc:%s",
590 __func__,
591 yes_no(ipv4ll_ready),
592 yes_no(dhcp4_ready),
593 yes_no(dhcp6_ready),
594 yes_no(dhcp_pd_ready),
595 yes_no(ndisc_ready));
596
597 ready:
598 link_set_state(link, LINK_STATE_CONFIGURED);
599 }
600
601 static int link_request_static_configs(Link *link) {
602 int r;
603
604 assert(link);
605 assert(link->network);
606 assert(link->state != _LINK_STATE_INVALID);
607
608 r = link_request_static_addresses(link);
609 if (r < 0)
610 return r;
611
612 r = link_request_static_address_labels(link);
613 if (r < 0)
614 return r;
615
616 r = link_request_static_bridge_fdb(link);
617 if (r < 0)
618 return r;
619
620 r = link_request_static_bridge_mdb(link);
621 if (r < 0)
622 return r;
623
624 r = link_request_static_ipv6_proxy_ndp_addresses(link);
625 if (r < 0)
626 return r;
627
628 r = link_request_static_neighbors(link);
629 if (r < 0)
630 return r;
631
632 r = link_request_static_nexthops(link, false);
633 if (r < 0)
634 return r;
635
636 r = link_request_static_routes(link, false);
637 if (r < 0)
638 return r;
639
640 r = link_request_static_routing_policy_rules(link);
641 if (r < 0)
642 return r;
643
644 return 0;
645 }
646
647 static int link_request_stacked_netdevs(Link *link) {
648 NetDev *netdev;
649 int r;
650
651 assert(link);
652
653 link->stacked_netdevs_created = false;
654
655 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) {
656 r = link_request_stacked_netdev(link, netdev);
657 if (r < 0)
658 return r;
659 }
660
661 if (link->create_stacked_netdev_messages == 0) {
662 link->stacked_netdevs_created = true;
663 link_check_ready(link);
664 }
665
666 return 0;
667 }
668
669 static int link_acquire_dynamic_ipv6_conf(Link *link) {
670 int r;
671
672 assert(link);
673
674 r = radv_start(link);
675 if (r < 0)
676 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Advertisement engine: %m");
677
678 r = ndisc_start(link);
679 if (r < 0)
680 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Discovery: %m");
681
682 r = dhcp6_start(link);
683 if (r < 0)
684 return log_link_warning_errno(link, r, "Failed to start DHCPv6 client: %m");
685
686 return 0;
687 }
688
689 static int link_acquire_dynamic_ipv4_conf(Link *link) {
690 int r;
691
692 assert(link);
693 assert(link->manager);
694 assert(link->manager->event);
695
696 if (link->dhcp_client) {
697 r = dhcp4_start(link);
698 if (r < 0)
699 return log_link_warning_errno(link, r, "Failed to start DHCPv4 client: %m");
700
701 log_link_debug(link, "Acquiring DHCPv4 lease.");
702
703 } else if (link->ipv4ll) {
704 if (in4_addr_is_set(&link->network->ipv4ll_start_address)) {
705 r = sd_ipv4ll_set_address(link->ipv4ll, &link->network->ipv4ll_start_address);
706 if (r < 0)
707 return log_link_warning_errno(link, r, "Could not set IPv4 link-local start address: %m");
708 }
709
710 r = sd_ipv4ll_start(link->ipv4ll);
711 if (r < 0)
712 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
713
714 log_link_debug(link, "Acquiring IPv4 link-local address.");
715 }
716
717 if (link->dhcp_server) {
718 r = sd_dhcp_server_start(link->dhcp_server);
719 if (r < 0)
720 return log_link_warning_errno(link, r, "Could not start DHCP server: %m");
721 }
722
723 r = ipv4acd_start(link);
724 if (r < 0)
725 return log_link_warning_errno(link, r, "Could not start IPv4 ACD client: %m");
726
727 return 0;
728 }
729
730 static int link_acquire_dynamic_conf(Link *link) {
731 int r;
732
733 assert(link);
734 assert(link->network);
735
736 r = link_acquire_dynamic_ipv4_conf(link);
737 if (r < 0)
738 return r;
739
740 if (in6_addr_is_set(&link->ipv6ll_address)) {
741 r = link_acquire_dynamic_ipv6_conf(link);
742 if (r < 0)
743 return r;
744 }
745
746 if (!link_radv_enabled(link) || !link->network->dhcp_pd_announce) {
747 /* DHCPv6PD downstream does not require IPv6LL address. But may require RADV to be
748 * configured, and RADV may not be configured yet here. Only acquire subnet prefix when
749 * RADV is disabled, or the announcement of the prefix is disabled. Otherwise, the
750 * below will be called in radv_start(). */
751 r = dhcp_request_prefix_delegation(link);
752 if (r < 0)
753 return log_link_warning_errno(link, r, "Failed to request DHCP delegated subnet prefix: %m");
754 }
755
756 if (link->lldp_tx) {
757 r = sd_lldp_tx_start(link->lldp_tx);
758 if (r < 0)
759 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
760 }
761
762 if (link->lldp_rx) {
763 r = sd_lldp_rx_start(link->lldp_rx);
764 if (r < 0)
765 return log_link_warning_errno(link, r, "Failed to start LLDP client: %m");
766 }
767
768 return 0;
769 }
770
771 int link_ipv6ll_gained(Link *link) {
772 int r;
773
774 assert(link);
775
776 log_link_info(link, "Gained IPv6LL");
777
778 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
779 return 0;
780
781 r = link_acquire_dynamic_ipv6_conf(link);
782 if (r < 0)
783 return r;
784
785 link_check_ready(link);
786 return 0;
787 }
788
789 int link_handle_bound_to_list(Link *link) {
790 bool required_up = false;
791 bool link_is_up = false;
792 Link *l;
793
794 assert(link);
795
796 /* If at least one interface in bound_to_links has carrier, then make this interface up.
797 * If all interfaces in bound_to_links do not, then make this interface down. */
798
799 if (hashmap_isempty(link->bound_to_links))
800 return 0;
801
802 if (link->flags & IFF_UP)
803 link_is_up = true;
804
805 HASHMAP_FOREACH(l, link->bound_to_links)
806 if (link_has_carrier(l)) {
807 required_up = true;
808 break;
809 }
810
811 if (!required_up && link_is_up)
812 return link_request_to_bring_up_or_down(link, /* up = */ false);
813 if (required_up && !link_is_up)
814 return link_request_to_bring_up_or_down(link, /* up = */ true);
815
816 return 0;
817 }
818
819 static int link_handle_bound_by_list(Link *link) {
820 Link *l;
821 int r;
822
823 assert(link);
824
825 /* Update up or down state of interfaces which depend on this interface's carrier state. */
826
827 if (hashmap_isempty(link->bound_by_links))
828 return 0;
829
830 HASHMAP_FOREACH(l, link->bound_by_links) {
831 r = link_handle_bound_to_list(l);
832 if (r < 0)
833 return r;
834 }
835
836 return 0;
837 }
838
839 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
840 int r;
841
842 assert(link);
843 assert(carrier);
844
845 if (link == carrier)
846 return 0;
847
848 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
849 return 0;
850
851 r = hashmap_ensure_put(h, NULL, INT_TO_PTR(carrier->ifindex), carrier);
852 if (r < 0)
853 return r;
854
855 link_dirty(link);
856
857 return 0;
858 }
859
860 static int link_new_bound_by_list(Link *link) {
861 Manager *m;
862 Link *carrier;
863 int r;
864
865 assert(link);
866 assert(link->manager);
867
868 m = link->manager;
869
870 HASHMAP_FOREACH(carrier, m->links_by_index) {
871 if (!carrier->network)
872 continue;
873
874 if (strv_isempty(carrier->network->bind_carrier))
875 continue;
876
877 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
878 r = link_put_carrier(link, carrier, &link->bound_by_links);
879 if (r < 0)
880 return r;
881 }
882 }
883
884 HASHMAP_FOREACH(carrier, link->bound_by_links) {
885 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
886 if (r < 0)
887 return r;
888 }
889
890 return 0;
891 }
892
893 static int link_new_bound_to_list(Link *link) {
894 Manager *m;
895 Link *carrier;
896 int r;
897
898 assert(link);
899 assert(link->manager);
900
901 if (!link->network)
902 return 0;
903
904 if (strv_isempty(link->network->bind_carrier))
905 return 0;
906
907 m = link->manager;
908
909 HASHMAP_FOREACH(carrier, m->links_by_index) {
910 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
911 r = link_put_carrier(link, carrier, &link->bound_to_links);
912 if (r < 0)
913 return r;
914 }
915 }
916
917 HASHMAP_FOREACH(carrier, link->bound_to_links) {
918 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
919 if (r < 0)
920 return r;
921 }
922
923 return 0;
924 }
925
926 static void link_free_bound_to_list(Link *link) {
927 bool updated = false;
928 Link *bound_to;
929
930 assert(link);
931
932 while ((bound_to = hashmap_steal_first(link->bound_to_links))) {
933 updated = true;
934
935 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
936 link_dirty(bound_to);
937 }
938
939 if (updated)
940 link_dirty(link);
941 }
942
943 static void link_free_bound_by_list(Link *link) {
944 bool updated = false;
945 Link *bound_by;
946
947 assert(link);
948
949 while ((bound_by = hashmap_steal_first(link->bound_by_links))) {
950 updated = true;
951
952 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
953 link_dirty(bound_by);
954 link_handle_bound_to_list(bound_by);
955 }
956 }
957
958 if (updated)
959 link_dirty(link);
960 }
961
962 static int link_append_to_master(Link *link) {
963 Link *master;
964 int r;
965
966 assert(link);
967
968 /* - The link may have no master.
969 * - RTM_NEWLINK message about master interface may not be received yet. */
970 if (link_get_master(link, &master) < 0)
971 return 0;
972
973 r = set_ensure_put(&master->slaves, NULL, link);
974 if (r <= 0)
975 return r;
976
977 link_ref(link);
978 return 0;
979 }
980
981 static void link_drop_from_master(Link *link) {
982 Link *master;
983
984 assert(link);
985
986 if (!link->manager)
987 return;
988
989 if (link_get_master(link, &master) < 0)
990 return;
991
992 link_unref(set_remove(master->slaves, link));
993 }
994
995 static int link_drop_requests(Link *link) {
996 Request *req;
997 int ret = 0;
998
999 assert(link);
1000 assert(link->manager);
1001
1002 ORDERED_SET_FOREACH(req, link->manager->request_queue) {
1003 if (req->link != link)
1004 continue;
1005
1006 /* If the request is already called, but its reply is not received, then we need to
1007 * drop the configuration (e.g. address) here. Note, if the configuration is known,
1008 * it will be handled later by link_drop_foreign_addresses() or so. */
1009 if (req->waiting_reply && link->state != LINK_STATE_LINGER)
1010 switch (req->type) {
1011 case REQUEST_TYPE_ADDRESS: {
1012 Address *address = ASSERT_PTR(req->userdata);
1013
1014 if (address_get(link, address, NULL) < 0)
1015 RET_GATHER(ret, address_remove(address, link));
1016 break;
1017 }
1018 case REQUEST_TYPE_NEIGHBOR: {
1019 Neighbor *neighbor = ASSERT_PTR(req->userdata);
1020
1021 if (neighbor_get(link, neighbor, NULL) < 0)
1022 RET_GATHER(ret, neighbor_remove(neighbor, link));
1023 break;
1024 }
1025 case REQUEST_TYPE_NEXTHOP: {
1026 NextHop *nexthop = ASSERT_PTR(req->userdata);
1027
1028 if (nexthop_get_by_id(link->manager, nexthop->id, NULL) < 0)
1029 RET_GATHER(ret, nexthop_remove(nexthop, link->manager));
1030 break;
1031 }
1032 case REQUEST_TYPE_ROUTE: {
1033 Route *route = ASSERT_PTR(req->userdata);
1034
1035 if (route_get(link->manager, route, NULL) < 0)
1036 RET_GATHER(ret, route_remove(route, link->manager));
1037 break;
1038 }
1039 default:
1040 ;
1041 }
1042
1043 request_detach(req);
1044 }
1045
1046 return ret;
1047 }
1048
1049 static Link *link_drop(Link *link) {
1050 if (!link)
1051 return NULL;
1052
1053 assert(link->manager);
1054
1055 link_set_state(link, LINK_STATE_LINGER);
1056
1057 /* Drop all references from other links and manager. Note that async netlink calls may have
1058 * references to the link, and they will be dropped when we receive replies. */
1059
1060 (void) link_drop_requests(link);
1061
1062 link_free_bound_to_list(link);
1063 link_free_bound_by_list(link);
1064
1065 link_clear_sr_iov_ifindices(link);
1066
1067 link_drop_from_master(link);
1068
1069 if (link->state_file)
1070 (void) unlink(link->state_file);
1071
1072 link_clean(link);
1073
1074 STRV_FOREACH(n, link->alternative_names)
1075 hashmap_remove(link->manager->links_by_name, *n);
1076 hashmap_remove(link->manager->links_by_name, link->ifname);
1077
1078 /* bonding master and its slaves have the same hardware address. */
1079 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
1080
1081 /* The following must be called at last. */
1082 assert_se(hashmap_remove(link->manager->links_by_index, INT_TO_PTR(link->ifindex)) == link);
1083 return link_unref(link);
1084 }
1085
1086 static int link_drop_foreign_config(Link *link) {
1087 int r;
1088
1089 assert(link);
1090 assert(link->manager);
1091
1092 /* Drop foreign config, but ignore unmanaged, loopback, or critical interfaces. We do not want
1093 * to remove loopback address or addresses used for root NFS. */
1094
1095 if (IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
1096 return 0;
1097 if (FLAGS_SET(link->flags, IFF_LOOPBACK))
1098 return 0;
1099 if (link->network->keep_configuration == KEEP_CONFIGURATION_YES)
1100 return 0;
1101
1102 r = link_drop_foreign_routes(link);
1103
1104 RET_GATHER(r, link_drop_foreign_nexthops(link));
1105 RET_GATHER(r, link_drop_foreign_addresses(link));
1106 RET_GATHER(r, link_drop_foreign_neighbors(link));
1107 RET_GATHER(r, manager_drop_foreign_routing_policy_rules(link->manager));
1108
1109 return r;
1110 }
1111
1112 static int link_drop_managed_config(Link *link) {
1113 int r;
1114
1115 assert(link);
1116 assert(link->manager);
1117
1118 r = link_drop_managed_routes(link);
1119
1120 RET_GATHER(r, link_drop_managed_nexthops(link));
1121 RET_GATHER(r, link_drop_managed_addresses(link));
1122 RET_GATHER(r, link_drop_managed_neighbors(link));
1123 RET_GATHER(r, link_drop_managed_routing_policy_rules(link));
1124
1125 return r;
1126 }
1127
1128 static void link_foreignize_config(Link *link) {
1129 assert(link);
1130 assert(link->manager);
1131
1132 link_foreignize_routes(link);
1133 link_foreignize_nexthops(link);
1134 link_foreignize_addresses(link);
1135 link_foreignize_neighbors(link);
1136 link_foreignize_routing_policy_rules(link);
1137 }
1138
1139 static int link_configure(Link *link) {
1140 int r;
1141
1142 assert(link);
1143 assert(link->network);
1144 assert(link->state == LINK_STATE_INITIALIZED);
1145
1146 link_set_state(link, LINK_STATE_CONFIGURING);
1147
1148 r = link_new_bound_to_list(link);
1149 if (r < 0)
1150 return r;
1151
1152 r = link_request_traffic_control(link);
1153 if (r < 0)
1154 return r;
1155
1156 r = link_configure_mtu(link);
1157 if (r < 0)
1158 return r;
1159
1160 if (link->iftype == ARPHRD_CAN) {
1161 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1162 r = link_request_to_set_can(link);
1163 if (r < 0)
1164 return r;
1165
1166 return link_request_to_activate(link);
1167 }
1168
1169 r = link_request_sr_iov_vfs(link);
1170 if (r < 0)
1171 return r;
1172
1173 r = link_set_sysctl(link);
1174 if (r < 0)
1175 return r;
1176
1177 r = link_request_to_set_mac(link, /* allow_retry = */ true);
1178 if (r < 0)
1179 return r;
1180
1181 r = link_request_to_set_ipoib(link);
1182 if (r < 0)
1183 return r;
1184
1185 r = link_request_to_set_flags(link);
1186 if (r < 0)
1187 return r;
1188
1189 r = link_request_to_set_group(link);
1190 if (r < 0)
1191 return r;
1192
1193 r = link_request_to_set_addrgen_mode(link);
1194 if (r < 0)
1195 return r;
1196
1197 r = link_request_to_set_master(link);
1198 if (r < 0)
1199 return r;
1200
1201 r = link_request_stacked_netdevs(link);
1202 if (r < 0)
1203 return r;
1204
1205 r = link_request_to_set_bond(link);
1206 if (r < 0)
1207 return r;
1208
1209 r = link_request_to_set_bridge(link);
1210 if (r < 0)
1211 return r;
1212
1213 r = link_request_to_set_bridge_vlan(link);
1214 if (r < 0)
1215 return r;
1216
1217 r = link_request_to_activate(link);
1218 if (r < 0)
1219 return r;
1220
1221 r = ipv4ll_configure(link);
1222 if (r < 0)
1223 return r;
1224
1225 r = link_request_dhcp4_client(link);
1226 if (r < 0)
1227 return r;
1228
1229 r = link_request_dhcp6_client(link);
1230 if (r < 0)
1231 return r;
1232
1233 r = link_request_ndisc(link);
1234 if (r < 0)
1235 return r;
1236
1237 r = link_request_dhcp_server(link);
1238 if (r < 0)
1239 return r;
1240
1241 r = link_request_radv(link);
1242 if (r < 0)
1243 return r;
1244
1245 r = link_lldp_rx_configure(link);
1246 if (r < 0)
1247 return r;
1248
1249 r = link_lldp_tx_configure(link);
1250 if (r < 0)
1251 return r;
1252
1253 r = link_drop_foreign_config(link);
1254 if (r < 0)
1255 return r;
1256
1257 r = link_request_static_configs(link);
1258 if (r < 0)
1259 return r;
1260
1261 if (!link_has_carrier(link))
1262 return 0;
1263
1264 return link_acquire_dynamic_conf(link);
1265 }
1266
1267 static int link_get_network(Link *link, Network **ret) {
1268 Network *network;
1269 int r;
1270
1271 assert(link);
1272 assert(link->manager);
1273 assert(ret);
1274
1275 ORDERED_HASHMAP_FOREACH(network, link->manager->networks) {
1276 bool warn = false;
1277
1278 r = net_match_config(
1279 &network->match,
1280 link->dev,
1281 &link->hw_addr,
1282 &link->permanent_hw_addr,
1283 link->driver,
1284 link->iftype,
1285 link->kind,
1286 link->ifname,
1287 link->alternative_names,
1288 link->wlan_iftype,
1289 link->ssid,
1290 &link->bssid);
1291 if (r < 0)
1292 return r;
1293 if (r == 0)
1294 continue;
1295
1296 if (network->match.ifname && link->dev) {
1297 uint8_t name_assign_type = NET_NAME_UNKNOWN;
1298 const char *attr;
1299
1300 if (sd_device_get_sysattr_value(link->dev, "name_assign_type", &attr) >= 0)
1301 (void) safe_atou8(attr, &name_assign_type);
1302
1303 warn = name_assign_type == NET_NAME_ENUM;
1304 }
1305
1306 log_link_full(link, warn ? LOG_WARNING : LOG_DEBUG,
1307 "found matching network '%s'%s.",
1308 network->filename,
1309 warn ? ", based on potentially unpredictable interface name" : "");
1310
1311 if (network->unmanaged)
1312 return -ENOENT;
1313
1314 *ret = network;
1315 return 0;
1316 }
1317
1318 return -ENOENT;
1319 }
1320
1321 int link_reconfigure_impl(Link *link, bool force) {
1322 Network *network = NULL;
1323 NetDev *netdev = NULL;
1324 int r;
1325
1326 assert(link);
1327
1328 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
1329 return 0;
1330
1331 r = netdev_get(link->manager, link->ifname, &netdev);
1332 if (r < 0 && r != -ENOENT)
1333 return r;
1334
1335 r = link_get_network(link, &network);
1336 if (r < 0 && r != -ENOENT)
1337 return r;
1338
1339 if (link->state != LINK_STATE_UNMANAGED && !network)
1340 /* If link is in initialized state, then link->network is also NULL. */
1341 force = true;
1342
1343 if (link->network == network && !force)
1344 return 0;
1345
1346 if (network) {
1347 _cleanup_free_ char *joined = strv_join(network->dropins, ", ");
1348
1349 if (link->state == LINK_STATE_INITIALIZED)
1350 log_link_info(link, "Configuring with %s%s%s%s.",
1351 network->filename,
1352 isempty(joined) ? "" : " (dropins: ",
1353 joined,
1354 isempty(joined) ? "" : ")");
1355 else
1356 log_link_info(link, "Reconfiguring with %s%s%s%s.",
1357 network->filename,
1358 isempty(joined) ? "" : " (dropins: ",
1359 joined,
1360 isempty(joined) ? "" : ")");
1361 } else
1362 log_link_full(link, link->state == LINK_STATE_INITIALIZED ? LOG_DEBUG : LOG_INFO,
1363 "Unmanaging interface.");
1364
1365 /* Dropping old .network file */
1366 r = link_stop_engines(link, false);
1367 if (r < 0)
1368 return r;
1369
1370 r = link_drop_requests(link);
1371 if (r < 0)
1372 return r;
1373
1374 if (network && !force && network->keep_configuration != KEEP_CONFIGURATION_YES)
1375 /* When a new/updated .network file is assigned, first make all configs (addresses,
1376 * routes, and so on) foreign, and then drop unnecessary configs later by
1377 * link_drop_foreign_config() in link_configure().
1378 * Note, when KeepConfiguration=yes, link_drop_foreign_config() does nothing. Hence,
1379 * here we need to drop the configs such as addresses, routes, and so on configured by
1380 * the previously assigned .network file. */
1381 link_foreignize_config(link);
1382 else {
1383 /* Remove all managed configs. Note, foreign configs are removed in later by
1384 * link_configure() -> link_drop_foreign_config() if the link is managed by us. */
1385 r = link_drop_managed_config(link);
1386 if (r < 0)
1387 return r;
1388 }
1389
1390 /* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the
1391 * bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will
1392 * not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the
1393 * map here, as it depends on .network files assigned to other links. */
1394 link_free_bound_to_list(link);
1395
1396 link_free_engines(link);
1397 link->network = network_unref(link->network);
1398
1399 netdev_unref(link->netdev);
1400 link->netdev = netdev_ref(netdev);
1401
1402 if (!network) {
1403 link_set_state(link, LINK_STATE_UNMANAGED);
1404 return 0;
1405 }
1406
1407 /* Then, apply new .network file */
1408 link->network = network_ref(network);
1409 link_update_operstate(link, true);
1410 link_dirty(link);
1411
1412 link_set_state(link, LINK_STATE_INITIALIZED);
1413 link->activated = false;
1414
1415 r = link_configure(link);
1416 if (r < 0)
1417 return r;
1418
1419 return 1;
1420 }
1421
1422 static int link_reconfigure_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, bool force) {
1423 int r;
1424
1425 assert(link);
1426
1427 r = link_getlink_handler_internal(rtnl, m, link, "Failed to update link state");
1428 if (r <= 0)
1429 return r;
1430
1431 r = link_reconfigure_impl(link, force);
1432 if (r < 0) {
1433 link_enter_failed(link);
1434 return 0;
1435 }
1436
1437 return r;
1438 }
1439
1440 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1441 return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ false);
1442 }
1443
1444 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1445 return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ true);
1446 }
1447
1448 int link_reconfigure(Link *link, bool force) {
1449 int r;
1450
1451 assert(link);
1452
1453 /* When link in pending or initialized state, then link_configure() will be called. To prevent
1454 * the function from being called multiple times simultaneously, refuse to reconfigure the
1455 * interface in these cases. */
1456 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
1457 return 0; /* 0 means no-op. */
1458
1459 r = link_call_getlink(link, force ? link_force_reconfigure_handler : link_reconfigure_handler);
1460 if (r < 0)
1461 return r;
1462
1463 return 1; /* 1 means the interface will be reconfigured. */
1464 }
1465
1466 static int link_initialized_and_synced(Link *link) {
1467 int r;
1468
1469 assert(link);
1470 assert(link->manager);
1471
1472 if (link->manager->test_mode) {
1473 log_link_debug(link, "Running in test mode, refusing to enter initialized state.");
1474 link_set_state(link, LINK_STATE_UNMANAGED);
1475 return 0;
1476 }
1477
1478 if (link->state == LINK_STATE_PENDING) {
1479 log_link_debug(link, "Link state is up-to-date");
1480 link_set_state(link, LINK_STATE_INITIALIZED);
1481
1482 r = link_new_bound_by_list(link);
1483 if (r < 0)
1484 return r;
1485
1486 r = link_handle_bound_by_list(link);
1487 if (r < 0)
1488 return r;
1489 }
1490
1491 return link_reconfigure_impl(link, /* force = */ false);
1492 }
1493
1494 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1495 int r;
1496
1497 r = link_getlink_handler_internal(rtnl, m, link, "Failed to wait for the interface to be initialized");
1498 if (r <= 0)
1499 return r;
1500
1501 r = link_initialized_and_synced(link);
1502 if (r < 0)
1503 link_enter_failed(link);
1504
1505 return 0;
1506 }
1507
1508 static int link_initialized(Link *link, sd_device *device) {
1509 int r;
1510
1511 assert(link);
1512 assert(device);
1513
1514 /* Always replace with the new sd_device object. As the sysname (and possibly other properties
1515 * or sysattrs) may be outdated. */
1516 device_unref_and_replace(link->dev, device);
1517
1518 if (link->dhcp_client) {
1519 r = sd_dhcp_client_attach_device(link->dhcp_client, link->dev);
1520 if (r < 0)
1521 log_link_warning_errno(link, r, "Failed to attach device to DHCPv4 client, ignoring: %m");
1522 }
1523
1524 if (link->dhcp6_client) {
1525 r = sd_dhcp6_client_attach_device(link->dhcp6_client, link->dev);
1526 if (r < 0)
1527 log_link_warning_errno(link, r, "Failed to attach device to DHCPv6 client, ignoring: %m");
1528 }
1529
1530 r = link_set_sr_iov_ifindices(link);
1531 if (r < 0)
1532 log_link_warning_errno(link, r, "Failed to manage SR-IOV PF and VF ports, ignoring: %m");
1533
1534 if (link->state != LINK_STATE_PENDING)
1535 return link_reconfigure(link, /* force = */ false);
1536
1537 log_link_debug(link, "udev initialized link");
1538
1539 /* udev has initialized the link, but we don't know if we have yet
1540 * processed the NEWLINK messages with the latest state. Do a GETLINK,
1541 * when it returns we know that the pending NEWLINKs have already been
1542 * processed and that we are up-to-date */
1543
1544 return link_call_getlink(link, link_initialized_handler);
1545 }
1546
1547 static int link_check_initialized(Link *link) {
1548 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
1549 int r;
1550
1551 assert(link);
1552
1553 if (!udev_available())
1554 return link_initialized_and_synced(link);
1555
1556 /* udev should be around */
1557 r = sd_device_new_from_ifindex(&device, link->ifindex);
1558 if (r < 0) {
1559 log_link_debug_errno(link, r, "Could not find device, waiting for device initialization: %m");
1560 return 0;
1561 }
1562
1563 r = sd_device_get_is_initialized(device);
1564 if (r < 0)
1565 return log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
1566 if (r == 0) {
1567 /* not yet ready */
1568 log_link_debug(link, "link pending udev initialization...");
1569 return 0;
1570 }
1571
1572 r = device_is_renaming(device);
1573 if (r < 0)
1574 return log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
1575 if (r > 0) {
1576 log_link_debug(link, "Interface is being renamed, pending initialization.");
1577 return 0;
1578 }
1579
1580 return link_initialized(link, device);
1581 }
1582
1583 int manager_udev_process_link(Manager *m, sd_device *device, sd_device_action_t action) {
1584 int r, ifindex;
1585 const char *s;
1586 Link *link;
1587
1588 assert(m);
1589 assert(device);
1590
1591 r = sd_device_get_ifindex(device, &ifindex);
1592 if (r < 0)
1593 return log_device_debug_errno(device, r, "Failed to get ifindex: %m");
1594
1595 r = link_get_by_index(m, ifindex, &link);
1596 if (r < 0) {
1597 /* This error is not critical, as the corresponding rtnl message may be received later. */
1598 log_device_debug_errno(device, r, "Failed to get link from ifindex %i, ignoring: %m", ifindex);
1599 return 0;
1600 }
1601
1602 /* Let's unref the sd-device object assigned to the corresponding Link object, but keep the Link
1603 * object here. It will be removed only when rtnetlink says so. */
1604 if (action == SD_DEVICE_REMOVE) {
1605 link->dev = sd_device_unref(link->dev);
1606 return 0;
1607 }
1608
1609 r = device_is_renaming(device);
1610 if (r < 0)
1611 return log_device_debug_errno(device, r, "Failed to determine if the device is renaming or not: %m");
1612 if (r > 0) {
1613 log_device_debug(device, "Device is renaming, waiting for the interface to be renamed.");
1614 /* TODO:
1615 * What happens when a device is initialized, then soon renamed after that? When we detect
1616 * such, maybe we should cancel or postpone all queued requests for the interface. */
1617 return 0;
1618 }
1619
1620 r = sd_device_get_property_value(device, "ID_NET_MANAGED_BY", &s);
1621 if (r < 0 && r != -ENOENT)
1622 log_device_debug_errno(device, r, "Failed to get ID_NET_MANAGED_BY udev property, ignoring: %m");
1623 if (r >= 0 && !streq(s, "io.systemd.Network")) {
1624 log_device_debug(device, "Interface is requested to be managed by '%s', not managing the interface.", s);
1625 link_set_state(link, LINK_STATE_UNMANAGED);
1626 return 0;
1627 }
1628
1629 r = link_initialized(link, device);
1630 if (r < 0)
1631 link_enter_failed(link);
1632
1633 return 0;
1634 }
1635
1636 static int link_carrier_gained(Link *link) {
1637 bool force_reconfigure;
1638 int r;
1639
1640 assert(link);
1641
1642 r = event_source_disable(link->carrier_lost_timer);
1643 if (r < 0)
1644 log_link_warning_errno(link, r, "Failed to disable carrier lost timer, ignoring: %m");
1645
1646 /* If a wireless interface was connected to an access point, and the SSID is changed (that is,
1647 * both previous_ssid and ssid are non-NULL), then the connected wireless network could be
1648 * changed. So, always reconfigure the link. Which means e.g. the DHCP client will be
1649 * restarted, and the correct network information will be gained.
1650 *
1651 * However, do not reconfigure the wireless interface forcibly if it was not connected to any
1652 * access points previously (previous_ssid is NULL in this case). As, a .network file may be
1653 * already assigned to the interface (in that case, the .network file does not have the SSID=
1654 * setting in the [Match] section), and the interface is already being configured. Of course,
1655 * there may exist another .network file with higher priority and a matching SSID= setting. But
1656 * in that case, link_reconfigure_impl() can handle that without the force_reconfigure flag.
1657 *
1658 * For non-wireless interfaces, we have no way to detect the connected network change. So,
1659 * setting force_reconfigure = false. Note, both ssid and previous_ssid are NULL in that case. */
1660 force_reconfigure = link->previous_ssid && !streq_ptr(link->previous_ssid, link->ssid);
1661 link->previous_ssid = mfree(link->previous_ssid);
1662
1663 /* AP and P2P-GO interfaces may have a new SSID - update the link properties in case a new .network
1664 * profile wants to match on it with SSID= in its [Match] section.
1665 */
1666 if (IN_SET(link->wlan_iftype, NL80211_IFTYPE_AP, NL80211_IFTYPE_P2P_GO)) {
1667 r = link_get_wlan_interface(link);
1668 if (r < 0)
1669 return r;
1670 }
1671
1672 /* At this stage, both wlan and link information should be up-to-date. Hence, it is not necessary to
1673 * call RTM_GETLINK, NL80211_CMD_GET_INTERFACE, or NL80211_CMD_GET_STATION commands, and simply call
1674 * link_reconfigure_impl(). Note, link_reconfigure_impl() returns 1 when the link is reconfigured. */
1675 r = link_reconfigure_impl(link, force_reconfigure);
1676 if (r != 0)
1677 return r;
1678
1679 r = link_handle_bound_by_list(link);
1680 if (r < 0)
1681 return r;
1682
1683 if (link->iftype == ARPHRD_CAN)
1684 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1685 return 0;
1686
1687 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
1688 r = link_acquire_dynamic_conf(link);
1689 if (r < 0)
1690 return r;
1691
1692 r = link_request_static_configs(link);
1693 if (r < 0)
1694 return r;
1695 }
1696
1697 return 0;
1698 }
1699
1700 static int link_carrier_lost_impl(Link *link) {
1701 int r, ret = 0;
1702
1703 assert(link);
1704
1705 link->previous_ssid = mfree(link->previous_ssid);
1706
1707 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1708 return 0;
1709
1710 if (!link->network)
1711 return 0;
1712
1713 r = link_stop_engines(link, false);
1714 if (r < 0)
1715 ret = r;
1716
1717 r = link_drop_managed_config(link);
1718 if (r < 0 && ret >= 0)
1719 ret = r;
1720
1721 return ret;
1722 }
1723
1724 static int link_carrier_lost_handler(sd_event_source *s, uint64_t usec, void *userdata) {
1725 Link *link = ASSERT_PTR(userdata);
1726 int r;
1727
1728 r = link_carrier_lost_impl(link);
1729 if (r < 0) {
1730 log_link_warning_errno(link, r, "Failed to process carrier lost event: %m");
1731 link_enter_failed(link);
1732 }
1733
1734 return 0;
1735 }
1736
1737 static int link_carrier_lost(Link *link) {
1738 uint16_t dhcp_mtu;
1739 usec_t usec;
1740 int r;
1741
1742 assert(link);
1743
1744 r = link_handle_bound_by_list(link);
1745 if (r < 0)
1746 return r;
1747
1748 if (link->iftype == ARPHRD_CAN)
1749 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1750 return 0;
1751
1752 if (!link->network)
1753 return 0;
1754
1755 if (link->network->ignore_carrier_loss_set)
1756 /* If IgnoreCarrierLoss= is explicitly specified, then use the specified value. */
1757 usec = link->network->ignore_carrier_loss_usec;
1758
1759 else if (link->network->bond && link->wlan_iftype > 0)
1760 /* Enslaving wlan interface to a bond disconnects from the connected AP, and causes its
1761 * carrier to be lost. See #19832. */
1762 usec = 3 * USEC_PER_SEC;
1763
1764 else if (link->network->dhcp_use_mtu &&
1765 link->dhcp_lease &&
1766 sd_dhcp_lease_get_mtu(link->dhcp_lease, &dhcp_mtu) >= 0 &&
1767 dhcp_mtu != link->original_mtu)
1768 /* Some drivers reset interfaces when changing MTU. Resetting interfaces by the static
1769 * MTU should not cause any issues, as MTU is changed only once. However, setting MTU
1770 * through DHCP lease causes an infinite loop of resetting the interface. See #18738. */
1771 usec = 5 * USEC_PER_SEC;
1772
1773 else
1774 /* Otherwise, use the implied default value. */
1775 usec = link->network->ignore_carrier_loss_usec;
1776
1777 if (usec == USEC_INFINITY)
1778 return 0;
1779
1780 if (usec == 0)
1781 return link_carrier_lost_impl(link);
1782
1783 return event_reset_time_relative(link->manager->event,
1784 &link->carrier_lost_timer,
1785 CLOCK_BOOTTIME,
1786 usec,
1787 0,
1788 link_carrier_lost_handler,
1789 link,
1790 0,
1791 "link-carrier-loss",
1792 true);
1793 }
1794
1795 static int link_admin_state_up(Link *link) {
1796 int r;
1797
1798 assert(link);
1799
1800 /* This is called every time an interface admin state changes to up;
1801 * specifically, when IFF_UP flag changes from unset to set. */
1802
1803 if (!link->network)
1804 return 0;
1805
1806 if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_DOWN) {
1807 log_link_info(link, "Activation policy is \"always-down\", forcing link down.");
1808 return link_request_to_bring_up_or_down(link, /* up = */ false);
1809 }
1810
1811 /* We set the ipv6 mtu after the device mtu, but the kernel resets
1812 * ipv6 mtu on NETDEV_UP, so we need to reset it. */
1813 r = link_set_ipv6_mtu(link);
1814 if (r < 0)
1815 log_link_warning_errno(link, r, "Cannot set IPv6 MTU, ignoring: %m");
1816
1817 return 0;
1818 }
1819
1820 static int link_admin_state_down(Link *link) {
1821 assert(link);
1822
1823 if (!link->network)
1824 return 0;
1825
1826 if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) {
1827 log_link_info(link, "Activation policy is \"always-up\", forcing link up.");
1828 return link_request_to_bring_up_or_down(link, /* up = */ true);
1829 }
1830
1831 return 0;
1832 }
1833
1834 static bool link_is_enslaved(Link *link) {
1835 if (link->flags & IFF_SLAVE)
1836 return true;
1837
1838 if (link->master_ifindex > 0)
1839 return true;
1840
1841 return false;
1842 }
1843
1844 void link_update_operstate(Link *link, bool also_update_master) {
1845 LinkOperationalState operstate;
1846 LinkCarrierState carrier_state;
1847 LinkAddressState ipv4_address_state, ipv6_address_state, address_state;
1848 LinkOnlineState online_state;
1849 _cleanup_strv_free_ char **p = NULL;
1850 bool changed = false;
1851
1852 assert(link);
1853
1854 if (link->kernel_operstate == IF_OPER_DORMANT)
1855 carrier_state = LINK_CARRIER_STATE_DORMANT;
1856 else if (link_has_carrier(link)) {
1857 if (link_is_enslaved(link))
1858 carrier_state = LINK_CARRIER_STATE_ENSLAVED;
1859 else
1860 carrier_state = LINK_CARRIER_STATE_CARRIER;
1861 } else if (link->flags & IFF_UP)
1862 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
1863 else
1864 carrier_state = LINK_CARRIER_STATE_OFF;
1865
1866 if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
1867 Link *slave;
1868
1869 SET_FOREACH(slave, link->slaves) {
1870 link_update_operstate(slave, false);
1871
1872 if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
1873 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
1874 }
1875 }
1876
1877 link_get_address_states(link, &ipv4_address_state, &ipv6_address_state, &address_state);
1878
1879 /* Mapping of address and carrier state vs operational state
1880 * carrier state
1881 * | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
1882 * ------------------------------------------------------------------------------
1883 * off | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
1884 * address_state degraded | off | no-carrier | dormant | degraded | degraded | enslaved
1885 * routable | off | no-carrier | dormant | routable | routable | routable
1886 */
1887
1888 if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_ROUTABLE)
1889 operstate = LINK_OPERSTATE_ROUTABLE;
1890 else if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_DEGRADED)
1891 operstate = LINK_OPERSTATE_DEGRADED;
1892 else if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
1893 operstate = (LinkOperationalState) carrier_state;
1894 else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
1895 operstate = LINK_OPERSTATE_ROUTABLE;
1896 else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
1897 operstate = LINK_OPERSTATE_DEGRADED;
1898 else
1899 operstate = LINK_OPERSTATE_ENSLAVED;
1900
1901 LinkOperationalStateRange req;
1902 link_required_operstate_for_online(link, &req);
1903
1904 /* Only determine online state for managed links with RequiredForOnline=yes */
1905 if (!link->network || !link->network->required_for_online)
1906 online_state = _LINK_ONLINE_STATE_INVALID;
1907
1908 else if (!operational_state_is_in_range(operstate, &req))
1909 online_state = LINK_ONLINE_STATE_OFFLINE;
1910
1911 else {
1912 AddressFamily required_family = link_required_family_for_online(link);
1913 bool needs_ipv4 = required_family & ADDRESS_FAMILY_IPV4;
1914 bool needs_ipv6 = required_family & ADDRESS_FAMILY_IPV6;
1915
1916 /* The operational state is within the range required for online.
1917 * If a particular address family is also required, we might revert
1918 * to offline in the blocks below. */
1919 online_state = LINK_ONLINE_STATE_ONLINE;
1920
1921 if (req.min >= LINK_OPERSTATE_DEGRADED) {
1922 if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_DEGRADED)
1923 online_state = LINK_ONLINE_STATE_OFFLINE;
1924 if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_DEGRADED)
1925 online_state = LINK_ONLINE_STATE_OFFLINE;
1926 }
1927
1928 if (req.min >= LINK_OPERSTATE_ROUTABLE) {
1929 if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1930 online_state = LINK_ONLINE_STATE_OFFLINE;
1931 if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1932 online_state = LINK_ONLINE_STATE_OFFLINE;
1933 }
1934 }
1935
1936 if (link->carrier_state != carrier_state) {
1937 link->carrier_state = carrier_state;
1938 changed = true;
1939 if (strv_extend(&p, "CarrierState") < 0)
1940 log_oom();
1941 }
1942
1943 if (link->address_state != address_state) {
1944 link->address_state = address_state;
1945 changed = true;
1946 if (strv_extend(&p, "AddressState") < 0)
1947 log_oom();
1948 }
1949
1950 if (link->ipv4_address_state != ipv4_address_state) {
1951 link->ipv4_address_state = ipv4_address_state;
1952 changed = true;
1953 if (strv_extend(&p, "IPv4AddressState") < 0)
1954 log_oom();
1955 }
1956
1957 if (link->ipv6_address_state != ipv6_address_state) {
1958 link->ipv6_address_state = ipv6_address_state;
1959 changed = true;
1960 if (strv_extend(&p, "IPv6AddressState") < 0)
1961 log_oom();
1962 }
1963
1964 if (link->operstate != operstate) {
1965 link->operstate = operstate;
1966 changed = true;
1967 if (strv_extend(&p, "OperationalState") < 0)
1968 log_oom();
1969 }
1970
1971 if (link->online_state != online_state) {
1972 link->online_state = online_state;
1973 changed = true;
1974 if (strv_extend(&p, "OnlineState") < 0)
1975 log_oom();
1976 }
1977
1978 if (p)
1979 link_send_changed_strv(link, p);
1980 if (changed)
1981 link_dirty(link);
1982
1983 if (also_update_master) {
1984 Link *master;
1985
1986 if (link_get_master(link, &master) >= 0)
1987 link_update_operstate(master, true);
1988 }
1989 }
1990
1991 #define FLAG_STRING(string, flag, old, new) \
1992 (((old ^ new) & flag) \
1993 ? ((old & flag) ? (" -" string) : (" +" string)) \
1994 : "")
1995
1996 static int link_update_flags(Link *link, sd_netlink_message *message) {
1997 bool link_was_admin_up, had_carrier;
1998 uint8_t operstate;
1999 unsigned flags;
2000 int r;
2001
2002 assert(link);
2003 assert(message);
2004
2005 r = sd_rtnl_message_link_get_flags(message, &flags);
2006 if (r < 0)
2007 return log_link_debug_errno(link, r, "rtnl: failed to read link flags: %m");
2008
2009 r = sd_netlink_message_read_u8(message, IFLA_OPERSTATE, &operstate);
2010 if (r == -ENODATA)
2011 /* If we got a message without operstate, assume the state was unchanged. */
2012 operstate = link->kernel_operstate;
2013 else if (r < 0)
2014 return log_link_debug_errno(link, r, "rtnl: failed to read operational state: %m");
2015
2016 if (link->flags == flags && link->kernel_operstate == operstate)
2017 return 0;
2018
2019 if (link->flags != flags) {
2020 unsigned unknown_flags, unknown_flags_added, unknown_flags_removed;
2021
2022 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",
2023 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
2024 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
2025 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
2026 FLAG_STRING("UP", IFF_UP, link->flags, flags),
2027 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
2028 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
2029 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
2030 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
2031 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
2032 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
2033 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
2034 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
2035 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
2036 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
2037 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
2038 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
2039 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
2040 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
2041 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
2042
2043 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
2044 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
2045 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
2046 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
2047 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
2048 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
2049 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
2050 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
2051
2052 if (unknown_flags_added)
2053 log_link_debug(link, "Unknown link flags gained, ignoring: %#.5x", unknown_flags_added);
2054
2055 if (unknown_flags_removed)
2056 log_link_debug(link, "Unknown link flags lost, ignoring: %#.5x", unknown_flags_removed);
2057 }
2058
2059 link_was_admin_up = link->flags & IFF_UP;
2060 had_carrier = link_has_carrier(link);
2061
2062 link->flags = flags;
2063 link->kernel_operstate = operstate;
2064
2065 link_update_operstate(link, true);
2066
2067 if (!link_was_admin_up && (link->flags & IFF_UP)) {
2068 log_link_info(link, "Link UP");
2069
2070 r = link_admin_state_up(link);
2071 if (r < 0)
2072 return r;
2073 } else if (link_was_admin_up && !(link->flags & IFF_UP)) {
2074 log_link_info(link, "Link DOWN");
2075
2076 r = link_admin_state_down(link);
2077 if (r < 0)
2078 return r;
2079 }
2080
2081 if (!had_carrier && link_has_carrier(link)) {
2082 log_link_info(link, "Gained carrier");
2083
2084 r = link_carrier_gained(link);
2085 if (r < 0)
2086 return r;
2087 } else if (had_carrier && !link_has_carrier(link)) {
2088 log_link_info(link, "Lost carrier");
2089
2090 r = link_carrier_lost(link);
2091 if (r < 0)
2092 return r;
2093 }
2094
2095 return 0;
2096 }
2097
2098 static int link_update_master(Link *link, sd_netlink_message *message) {
2099 int master_ifindex, r;
2100
2101 assert(link);
2102 assert(message);
2103
2104 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t*) &master_ifindex);
2105 if (r == -ENODATA)
2106 return 0;
2107 if (r < 0)
2108 return log_link_debug_errno(link, r, "rtnl: failed to read master ifindex: %m");
2109
2110 if (master_ifindex == link->ifindex)
2111 master_ifindex = 0;
2112
2113 if (master_ifindex != link->master_ifindex) {
2114 if (link->master_ifindex == 0)
2115 log_link_debug(link, "Attached to master interface: %i", master_ifindex);
2116 else if (master_ifindex == 0)
2117 log_link_debug(link, "Detached from master interface: %i", link->master_ifindex);
2118 else
2119 log_link_debug(link, "Master interface changed: %i %s %i", link->master_ifindex,
2120 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), master_ifindex);
2121
2122 link_drop_from_master(link);
2123 link->master_ifindex = master_ifindex;
2124 }
2125
2126 r = link_append_to_master(link);
2127 if (r < 0)
2128 return log_link_debug_errno(link, r, "Failed to append link to master: %m");
2129
2130 return 0;
2131 }
2132
2133 static int link_update_driver(Link *link, sd_netlink_message *message) {
2134 int r;
2135
2136 assert(link);
2137 assert(link->manager);
2138 assert(message);
2139
2140 /* Driver is already read. Assuming the driver is never changed. */
2141 if (link->ethtool_driver_read)
2142 return 0;
2143
2144 /* When udevd is running, read the driver after the interface is initialized by udevd.
2145 * Otherwise, ethtool may not work correctly. See issue #22538.
2146 * When udevd is not running, read the value when the interface is detected. */
2147 if (udev_available() && !link->dev)
2148 return 0;
2149
2150 link->ethtool_driver_read = true;
2151
2152 r = ethtool_get_driver(&link->manager->ethtool_fd, link->ifname, &link->driver);
2153 if (r < 0) {
2154 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
2155 return 0;
2156 }
2157
2158 log_link_debug(link, "Found driver: %s", strna(link->driver));
2159
2160 if (streq_ptr(link->driver, "dsa")) {
2161 uint32_t dsa_master_ifindex = 0;
2162
2163 r = sd_netlink_message_read_u32(message, IFLA_LINK, &dsa_master_ifindex);
2164 if (r < 0 && r != -ENODATA)
2165 return log_link_debug_errno(link, r, "rtnl: failed to read ifindex of the DSA master interface: %m");
2166
2167 if (dsa_master_ifindex > INT_MAX) {
2168 log_link_debug(link, "rtnl: received too large DSA master ifindex (%"PRIu32" > INT_MAX), ignoring.",
2169 dsa_master_ifindex);
2170 dsa_master_ifindex = 0;
2171 }
2172
2173 link->dsa_master_ifindex = (int) dsa_master_ifindex;
2174 }
2175
2176 return 1; /* needs reconfigure */
2177 }
2178
2179 static int link_update_permanent_hardware_address_from_ethtool(Link *link, sd_netlink_message *message) {
2180 int r;
2181
2182 assert(link);
2183 assert(link->manager);
2184 assert(message);
2185
2186 if (link->ethtool_permanent_hw_addr_read)
2187 return 0;
2188
2189 /* When udevd is running, read the permanent hardware address after the interface is
2190 * initialized by udevd. Otherwise, ethtool may not work correctly. See issue #22538.
2191 * When udevd is not running, read the value when the interface is detected. */
2192 if (udev_available() && !link->dev)
2193 return 0;
2194
2195 /* If the interface does not have a hardware address, then it will not have a permanent address either. */
2196 r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, NULL);
2197 if (r == -ENODATA)
2198 return 0;
2199 if (r < 0)
2200 return log_link_debug_errno(link, r, "Failed to read IFLA_ADDRESS attribute: %m");
2201
2202 link->ethtool_permanent_hw_addr_read = true;
2203
2204 r = ethtool_get_permanent_hw_addr(&link->manager->ethtool_fd, link->ifname, &link->permanent_hw_addr);
2205 if (r < 0)
2206 log_link_debug_errno(link, r, "Permanent hardware address not found, continuing without: %m");
2207
2208 return 0;
2209 }
2210
2211 static int link_update_permanent_hardware_address(Link *link, sd_netlink_message *message) {
2212 int r;
2213
2214 assert(link);
2215 assert(link->manager);
2216 assert(message);
2217
2218 if (link->permanent_hw_addr.length > 0)
2219 return 0;
2220
2221 r = netlink_message_read_hw_addr(message, IFLA_PERM_ADDRESS, &link->permanent_hw_addr);
2222 if (r < 0) {
2223 if (r != -ENODATA)
2224 return log_link_debug_errno(link, r, "Failed to read IFLA_PERM_ADDRESS attribute: %m");
2225
2226 /* Fallback to ethtool for older kernels. */
2227 r = link_update_permanent_hardware_address_from_ethtool(link, message);
2228 if (r < 0)
2229 return r;
2230 }
2231
2232 if (link->permanent_hw_addr.length > 0)
2233 log_link_debug(link, "Saved permanent hardware address: %s", HW_ADDR_TO_STR(&link->permanent_hw_addr));
2234
2235 return 1; /* needs reconfigure */
2236 }
2237
2238 static int link_update_hardware_address(Link *link, sd_netlink_message *message) {
2239 struct hw_addr_data addr;
2240 int r;
2241
2242 assert(link);
2243 assert(message);
2244
2245 r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr);
2246 if (r < 0 && r != -ENODATA)
2247 return log_link_debug_errno(link, r, "rtnl: failed to read broadcast address: %m");
2248
2249 r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &addr);
2250 if (r == -ENODATA)
2251 return 0;
2252 if (r < 0)
2253 return log_link_debug_errno(link, r, "rtnl: failed to read hardware address: %m");
2254
2255 if (hw_addr_equal(&link->hw_addr, &addr))
2256 return 0;
2257
2258 if (link->hw_addr.length == 0)
2259 log_link_debug(link, "Saved hardware address: %s", HW_ADDR_TO_STR(&addr));
2260 else {
2261 log_link_debug(link, "Hardware address is changed: %s %s %s",
2262 HW_ADDR_TO_STR(&link->hw_addr),
2263 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT),
2264 HW_ADDR_TO_STR(&addr));
2265
2266 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
2267 }
2268
2269 link->hw_addr = addr;
2270
2271 if (!hw_addr_is_null(&link->hw_addr)) {
2272 r = hashmap_ensure_put(&link->manager->links_by_hw_addr, &hw_addr_hash_ops, &link->hw_addr, link);
2273 if (r == -EEXIST && streq_ptr(link->kind, "bond"))
2274 /* bonding master and its slaves have the same hardware address. */
2275 r = hashmap_replace(link->manager->links_by_hw_addr, &link->hw_addr, link);
2276 if (r < 0)
2277 log_link_debug_errno(link, r, "Failed to manage link by its new hardware address, ignoring: %m");
2278 }
2279
2280 r = ipv4acd_update_mac(link);
2281 if (r < 0)
2282 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m");
2283
2284 r = ipv4ll_update_mac(link);
2285 if (r < 0)
2286 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
2287
2288 r = dhcp4_update_mac(link);
2289 if (r < 0)
2290 return log_link_debug_errno(link, r, "Could not update MAC address in DHCP client: %m");
2291
2292 r = dhcp6_update_mac(link);
2293 if (r < 0)
2294 return log_link_debug_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
2295
2296 r = radv_update_mac(link);
2297 if (r < 0)
2298 return log_link_debug_errno(link, r, "Could not update MAC address for Router Advertisement: %m");
2299
2300 if (link->ndisc && link->hw_addr.length == ETH_ALEN) {
2301 r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether);
2302 if (r < 0)
2303 return log_link_debug_errno(link, r, "Could not update MAC for NDisc: %m");
2304 }
2305
2306 if (link->lldp_rx) {
2307 r = sd_lldp_rx_set_filter_address(link->lldp_rx, &link->hw_addr.ether);
2308 if (r < 0)
2309 return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Rx: %m");
2310 }
2311
2312 if (link->lldp_tx) {
2313 r = sd_lldp_tx_set_hwaddr(link->lldp_tx, &link->hw_addr.ether);
2314 if (r < 0)
2315 return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Tx: %m");
2316 }
2317
2318 return 1; /* needs reconfigure */
2319 }
2320
2321 static int link_update_mtu(Link *link, sd_netlink_message *message) {
2322 uint32_t mtu, min_mtu = 0, max_mtu = UINT32_MAX;
2323 int r;
2324
2325 assert(link);
2326 assert(message);
2327
2328 r = sd_netlink_message_read_u32(message, IFLA_MTU, &mtu);
2329 if (r == -ENODATA)
2330 return 0;
2331 if (r < 0)
2332 return log_link_debug_errno(link, r, "rtnl: failed to read MTU in RTM_NEWLINK message: %m");
2333 if (mtu == 0)
2334 return 0;
2335
2336 r = sd_netlink_message_read_u32(message, IFLA_MIN_MTU, &min_mtu);
2337 if (r < 0 && r != -ENODATA)
2338 return log_link_debug_errno(link, r, "rtnl: failed to read minimum MTU in RTM_NEWLINK message: %m");
2339
2340 r = sd_netlink_message_read_u32(message, IFLA_MAX_MTU, &max_mtu);
2341 if (r < 0 && r != -ENODATA)
2342 return log_link_debug_errno(link, r, "rtnl: failed to read maximum MTU in RTM_NEWLINK message: %m");
2343
2344 if (max_mtu == 0)
2345 max_mtu = UINT32_MAX;
2346
2347 link->min_mtu = min_mtu;
2348 link->max_mtu = max_mtu;
2349
2350 if (link->original_mtu == 0) {
2351 link->original_mtu = mtu;
2352 log_link_debug(link, "Saved original MTU %" PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2353 link->original_mtu, link->min_mtu, link->max_mtu);
2354 }
2355
2356 if (link->mtu == mtu)
2357 return 0;
2358
2359 if (link->mtu != 0)
2360 log_link_debug(link, "MTU is changed: %"PRIu32" %s %"PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2361 link->mtu, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), mtu,
2362 link->min_mtu, link->max_mtu);
2363
2364 link->mtu = mtu;
2365
2366 if (link->dhcp_client) {
2367 r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
2368 if (r < 0)
2369 return log_link_debug_errno(link, r, "Could not update MTU in DHCP client: %m");
2370 }
2371
2372 if (link->radv) {
2373 r = sd_radv_set_mtu(link->radv, link->mtu);
2374 if (r < 0)
2375 return log_link_debug_errno(link, r, "Could not set MTU for Router Advertisement: %m");
2376 }
2377
2378 return 0;
2379 }
2380
2381 static int link_update_alternative_names(Link *link, sd_netlink_message *message) {
2382 _cleanup_strv_free_ char **altnames = NULL;
2383 int r;
2384
2385 assert(link);
2386 assert(message);
2387
2388 r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &altnames);
2389 if (r == -ENODATA)
2390 /* The message does not have IFLA_PROP_LIST container attribute. It does not mean the
2391 * interface has no alternative name. */
2392 return 0;
2393 if (r < 0)
2394 return log_link_debug_errno(link, r, "rtnl: failed to read alternative names: %m");
2395
2396 if (strv_equal(altnames, link->alternative_names))
2397 return 0;
2398
2399 STRV_FOREACH(n, link->alternative_names)
2400 hashmap_remove(link->manager->links_by_name, *n);
2401
2402 strv_free_and_replace(link->alternative_names, altnames);
2403
2404 STRV_FOREACH(n, link->alternative_names) {
2405 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, *n, link);
2406 if (r < 0)
2407 return log_link_debug_errno(link, r, "Failed to manage link by its new alternative names: %m");
2408 }
2409
2410 return 1; /* needs reconfigure */
2411 }
2412
2413 static int link_update_name(Link *link, sd_netlink_message *message) {
2414 char ifname_from_index[IF_NAMESIZE];
2415 const char *ifname;
2416 int r;
2417
2418 assert(link);
2419 assert(message);
2420
2421 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
2422 if (r == -ENODATA)
2423 /* Hmm?? But ok. */
2424 return 0;
2425 if (r < 0)
2426 return log_link_debug_errno(link, r, "Failed to read interface name in RTM_NEWLINK message: %m");
2427
2428 if (streq(ifname, link->ifname))
2429 return 0;
2430
2431 r = format_ifname(link->ifindex, ifname_from_index);
2432 if (r < 0)
2433 return log_link_debug_errno(link, r, "Could not get interface name for index %i.", link->ifindex);
2434
2435 if (!streq(ifname, ifname_from_index)) {
2436 log_link_debug(link, "New interface name '%s' received from the kernel does not correspond "
2437 "with the name currently configured on the actual interface '%s'. Ignoring.",
2438 ifname, ifname_from_index);
2439 return 0;
2440 }
2441
2442 log_link_info(link, "Interface name change detected, renamed to %s.", ifname);
2443
2444 hashmap_remove(link->manager->links_by_name, link->ifname);
2445
2446 r = free_and_strdup(&link->ifname, ifname);
2447 if (r < 0)
2448 return log_oom_debug();
2449
2450 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, link->ifname, link);
2451 if (r < 0)
2452 return log_link_debug_errno(link, r, "Failed to manage link by its new name: %m");
2453
2454 if (link->dhcp_client) {
2455 r = sd_dhcp_client_set_ifname(link->dhcp_client, link->ifname);
2456 if (r < 0)
2457 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP client: %m");
2458 }
2459
2460 if (link->dhcp6_client) {
2461 r = sd_dhcp6_client_set_ifname(link->dhcp6_client, link->ifname);
2462 if (r < 0)
2463 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP6 client: %m");
2464 }
2465
2466 if (link->ndisc) {
2467 r = sd_ndisc_set_ifname(link->ndisc, link->ifname);
2468 if (r < 0)
2469 return log_link_debug_errno(link, r, "Failed to update interface name in NDisc: %m");
2470 }
2471
2472 if (link->dhcp_server) {
2473 r = sd_dhcp_server_set_ifname(link->dhcp_server, link->ifname);
2474 if (r < 0)
2475 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP server: %m");
2476 }
2477
2478 if (link->radv) {
2479 r = sd_radv_set_ifname(link->radv, link->ifname);
2480 if (r < 0)
2481 return log_link_debug_errno(link, r, "Failed to update interface name in Router Advertisement: %m");
2482 }
2483
2484 if (link->lldp_rx) {
2485 r = sd_lldp_rx_set_ifname(link->lldp_rx, link->ifname);
2486 if (r < 0)
2487 return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Rx: %m");
2488 }
2489
2490 if (link->lldp_tx) {
2491 r = sd_lldp_tx_set_ifname(link->lldp_tx, link->ifname);
2492 if (r < 0)
2493 return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Tx: %m");
2494 }
2495
2496 if (link->ipv4ll) {
2497 r = sd_ipv4ll_set_ifname(link->ipv4ll, link->ifname);
2498 if (r < 0)
2499 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4LL client: %m");
2500 }
2501
2502 r = ipv4acd_set_ifname(link);
2503 if (r < 0)
2504 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4ACD client: %m");
2505
2506 return 1; /* needs reconfigure */
2507 }
2508
2509 static int link_update(Link *link, sd_netlink_message *message) {
2510 bool needs_reconfigure = false;
2511 int r;
2512
2513 assert(link);
2514 assert(message);
2515
2516 r = link_update_name(link, message);
2517 if (r < 0)
2518 return r;
2519 needs_reconfigure = needs_reconfigure || r > 0;
2520
2521 r = link_update_alternative_names(link, message);
2522 if (r < 0)
2523 return r;
2524 needs_reconfigure = needs_reconfigure || r > 0;
2525
2526 r = link_update_mtu(link, message);
2527 if (r < 0)
2528 return r;
2529
2530 r = link_update_driver(link, message);
2531 if (r < 0)
2532 return r;
2533 needs_reconfigure = needs_reconfigure || r > 0;
2534
2535 r = link_update_permanent_hardware_address(link, message);
2536 if (r < 0)
2537 return r;
2538 needs_reconfigure = needs_reconfigure || r > 0;
2539
2540 r = link_update_hardware_address(link, message);
2541 if (r < 0)
2542 return r;
2543 needs_reconfigure = needs_reconfigure || r > 0;
2544
2545 r = link_update_master(link, message);
2546 if (r < 0)
2547 return r;
2548
2549 r = link_update_ipv6ll_addrgen_mode(link, message);
2550 if (r < 0)
2551 return r;
2552
2553 r = link_update_flags(link, message);
2554 if (r < 0)
2555 return r;
2556
2557 r = link_update_bridge_vlan(link, message);
2558 if (r < 0)
2559 return r;
2560
2561 return needs_reconfigure;
2562 }
2563
2564 static Link *link_drop_or_unref(Link *link) {
2565 if (!link)
2566 return NULL;
2567 if (!link->manager)
2568 return link_unref(link);
2569 return link_drop(link);
2570 }
2571
2572 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_drop_or_unref);
2573
2574 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
2575 _cleanup_free_ char *ifname = NULL, *kind = NULL, *state_file = NULL, *lease_file = NULL, *lldp_file = NULL;
2576 _cleanup_(link_drop_or_unrefp) Link *link = NULL;
2577 unsigned short iftype;
2578 int r, ifindex;
2579
2580 assert(manager);
2581 assert(message);
2582 assert(ret);
2583
2584 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2585 if (r < 0)
2586 return log_debug_errno(r, "rtnl: failed to read ifindex from link message: %m");
2587 else if (ifindex <= 0)
2588 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "rtnl: received link message without valid ifindex.");
2589
2590 r = sd_rtnl_message_link_get_type(message, &iftype);
2591 if (r < 0)
2592 return log_debug_errno(r, "rtnl: failed to read interface type from link message: %m");
2593
2594 r = sd_netlink_message_read_string_strdup(message, IFLA_IFNAME, &ifname);
2595 if (r < 0)
2596 return log_debug_errno(r, "rtnl: failed to read interface name from link message: %m");
2597
2598 /* check for link kind */
2599 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
2600 if (r >= 0) {
2601 r = sd_netlink_message_read_string_strdup(message, IFLA_INFO_KIND, &kind);
2602 if (r < 0 && r != -ENODATA)
2603 return log_debug_errno(r, "rtnl: failed to read interface kind from link message: %m");
2604 r = sd_netlink_message_exit_container(message);
2605 if (r < 0)
2606 return log_debug_errno(r, "rtnl: failed to exit IFLA_LINKINFO container: %m");
2607 }
2608
2609 if (!manager->test_mode) {
2610 /* Do not update state files when running in test mode. */
2611 if (asprintf(&state_file, "/run/systemd/netif/links/%d", ifindex) < 0)
2612 return log_oom_debug();
2613
2614 if (asprintf(&lease_file, "/run/systemd/netif/leases/%d", ifindex) < 0)
2615 return log_oom_debug();
2616
2617 if (asprintf(&lldp_file, "/run/systemd/netif/lldp/%d", ifindex) < 0)
2618 return log_oom_debug();
2619 }
2620
2621 link = new(Link, 1);
2622 if (!link)
2623 return -ENOMEM;
2624
2625 *link = (Link) {
2626 .n_ref = 1,
2627 .state = LINK_STATE_PENDING,
2628 .online_state = _LINK_ONLINE_STATE_INVALID,
2629 .automatic_reconfigure_ratelimit = (const RateLimit) { .interval = 10 * USEC_PER_SEC, .burst = 5 },
2630 .ifindex = ifindex,
2631 .iftype = iftype,
2632 .ifname = TAKE_PTR(ifname),
2633 .kind = TAKE_PTR(kind),
2634
2635 .bridge_vlan_pvid = UINT16_MAX,
2636
2637 .ipv6ll_address_gen_mode = _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_INVALID,
2638
2639 .state_file = TAKE_PTR(state_file),
2640 .lease_file = TAKE_PTR(lease_file),
2641 .lldp_file = TAKE_PTR(lldp_file),
2642
2643 .n_dns = UINT_MAX,
2644 .dns_default_route = -1,
2645 .llmnr = _RESOLVE_SUPPORT_INVALID,
2646 .mdns = _RESOLVE_SUPPORT_INVALID,
2647 .dnssec_mode = _DNSSEC_MODE_INVALID,
2648 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
2649 };
2650
2651 r = hashmap_ensure_put(&manager->links_by_index, NULL, INT_TO_PTR(link->ifindex), link);
2652 if (r < 0)
2653 return log_link_debug_errno(link, r, "Failed to store link into manager: %m");
2654
2655 link->manager = manager;
2656
2657 r = hashmap_ensure_put(&manager->links_by_name, &string_hash_ops, link->ifname, link);
2658 if (r < 0)
2659 return log_link_debug_errno(link, r, "Failed to manage link by its interface name: %m");
2660
2661 log_link_debug(link, "Saved new link: ifindex=%i, iftype=%s(%u), kind=%s",
2662 link->ifindex, strna(arphrd_to_name(link->iftype)), link->iftype, strna(link->kind));
2663
2664 /* If contained in this set, the link is wireless and the corresponding NL80211_CMD_NEW_INTERFACE
2665 * message arrived too early. Request the wireless link information again.
2666 */
2667 if (set_remove(manager->new_wlan_ifindices, INT_TO_PTR(link->ifindex))) {
2668 r = link_get_wlan_interface(link);
2669 if (r < 0)
2670 log_link_warning_errno(link, r, "Failed to get wireless interface, ignoring: %m");
2671 }
2672
2673 *ret = TAKE_PTR(link);
2674 return 0;
2675 }
2676
2677 int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, Manager *manager) {
2678 Link *link = NULL;
2679 NetDev *netdev = NULL;
2680 uint16_t type;
2681 const char *name;
2682 int r, ifindex;
2683
2684 assert(rtnl);
2685 assert(message);
2686 assert(manager);
2687
2688 if (sd_netlink_message_is_error(message)) {
2689 r = sd_netlink_message_get_errno(message);
2690 if (r < 0)
2691 log_message_warning_errno(message, r, "rtnl: Could not receive link message, ignoring");
2692
2693 return 0;
2694 }
2695
2696 r = sd_netlink_message_get_type(message, &type);
2697 if (r < 0) {
2698 log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
2699 return 0;
2700 } else if (!IN_SET(type, RTM_NEWLINK, RTM_DELLINK)) {
2701 log_warning("rtnl: Received unexpected message type %u when processing link, ignoring.", type);
2702 return 0;
2703 }
2704
2705 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2706 if (r < 0) {
2707 log_warning_errno(r, "rtnl: Could not get ifindex from link message, ignoring: %m");
2708 return 0;
2709 } else if (ifindex <= 0) {
2710 log_warning("rtnl: received link message with invalid ifindex %d, ignoring.", ifindex);
2711 return 0;
2712 }
2713
2714 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
2715 if (r < 0) {
2716 log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
2717 return 0;
2718 }
2719
2720 (void) link_get_by_index(manager, ifindex, &link);
2721 (void) netdev_get(manager, name, &netdev);
2722
2723 switch (type) {
2724 case RTM_NEWLINK:
2725 if (netdev) {
2726 /* netdev exists, so make sure the ifindex matches */
2727 r = netdev_set_ifindex(netdev, message);
2728 if (r < 0) {
2729 log_netdev_warning_errno(netdev, r, "Could not process new link message for netdev, ignoring: %m");
2730 return 0;
2731 }
2732 }
2733
2734 if (!link) {
2735 /* link is new, so add it */
2736 r = link_new(manager, message, &link);
2737 if (r < 0) {
2738 log_warning_errno(r, "Could not process new link message: %m");
2739 return 0;
2740 }
2741
2742 r = link_update(link, message);
2743 if (r < 0) {
2744 log_link_warning_errno(link, r, "Could not process link message: %m");
2745 link_enter_failed(link);
2746 return 0;
2747 }
2748
2749 r = link_check_initialized(link);
2750 if (r < 0) {
2751 log_link_warning_errno(link, r, "Failed to check link is initialized: %m");
2752 link_enter_failed(link);
2753 return 0;
2754 }
2755 } else {
2756 r = link_update(link, message);
2757 if (r < 0) {
2758 log_link_warning_errno(link, r, "Could not process link message: %m");
2759 link_enter_failed(link);
2760 return 0;
2761 }
2762 if (r > 0) {
2763 r = link_reconfigure_impl(link, /* force = */ false);
2764 if (r < 0) {
2765 log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
2766 link_enter_failed(link);
2767 return 0;
2768 }
2769 }
2770 }
2771 break;
2772
2773 case RTM_DELLINK:
2774 link_drop(link);
2775 netdev_drop(netdev);
2776 break;
2777
2778 default:
2779 assert_not_reached();
2780 }
2781
2782 return 1;
2783 }
2784
2785 int link_getlink_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, const char *error_msg) {
2786 uint16_t message_type;
2787 int r;
2788
2789 assert(m);
2790 assert(link);
2791 assert(error_msg);
2792
2793 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2794 return 0;
2795
2796 r = sd_netlink_message_get_errno(m);
2797 if (r < 0) {
2798 log_link_message_warning_errno(link, m, r, error_msg);
2799 link_enter_failed(link);
2800 return 0;
2801 }
2802
2803 r = sd_netlink_message_get_type(m, &message_type);
2804 if (r < 0) {
2805 log_link_debug_errno(link, r, "rtnl: failed to read link message type, ignoring: %m");
2806 return 0;
2807 }
2808 if (message_type != RTM_NEWLINK) {
2809 log_link_debug(link, "rtnl: received invalid link message type, ignoring.");
2810 return 0;
2811 }
2812
2813 r = link_update(link, m);
2814 if (r < 0) {
2815 link_enter_failed(link);
2816 return 0;
2817 }
2818
2819 return 1;
2820 }
2821
2822 int link_call_getlink(Link *link, link_netlink_message_handler_t callback) {
2823 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2824 int r;
2825
2826 assert(link);
2827 assert(link->manager);
2828 assert(link->manager->rtnl);
2829 assert(callback);
2830
2831 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
2832 if (r < 0)
2833 return r;
2834
2835 r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
2836 link_netlink_destroy_callback, link);
2837 if (r < 0)
2838 return r;
2839
2840 link_ref(link);
2841 return 0;
2842 }
2843
2844 static const char* const link_state_table[_LINK_STATE_MAX] = {
2845 [LINK_STATE_PENDING] = "pending",
2846 [LINK_STATE_INITIALIZED] = "initialized",
2847 [LINK_STATE_CONFIGURING] = "configuring",
2848 [LINK_STATE_CONFIGURED] = "configured",
2849 [LINK_STATE_UNMANAGED] = "unmanaged",
2850 [LINK_STATE_FAILED] = "failed",
2851 [LINK_STATE_LINGER] = "linger",
2852 };
2853
2854 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
2855
2856 int link_flags_to_string_alloc(uint32_t flags, char **ret) {
2857 _cleanup_free_ char *str = NULL;
2858 static const char* map[] = {
2859 [LOG2U(IFF_UP)] = "up", /* interface is up. */
2860 [LOG2U(IFF_BROADCAST)] = "broadcast", /* broadcast address valid. */
2861 [LOG2U(IFF_DEBUG)] = "debug", /* turn on debugging. */
2862 [LOG2U(IFF_LOOPBACK)] = "loopback", /* interface is a loopback net. */
2863 [LOG2U(IFF_POINTOPOINT)] = "point-to-point", /* interface has p-p link. */
2864 [LOG2U(IFF_NOTRAILERS)] = "no-trailers", /* avoid use of trailers. */
2865 [LOG2U(IFF_RUNNING)] = "running", /* interface RFC2863 OPER_UP. */
2866 [LOG2U(IFF_NOARP)] = "no-arp", /* no ARP protocol. */
2867 [LOG2U(IFF_PROMISC)] = "promiscuous", /* receive all packets. */
2868 [LOG2U(IFF_ALLMULTI)] = "all-multicast", /* receive all multicast packets. */
2869 [LOG2U(IFF_MASTER)] = "master", /* master of a load balancer. */
2870 [LOG2U(IFF_SLAVE)] = "slave", /* slave of a load balancer. */
2871 [LOG2U(IFF_MULTICAST)] = "multicast", /* supports multicast. */
2872 [LOG2U(IFF_PORTSEL)] = "portsel", /* can set media type. */
2873 [LOG2U(IFF_AUTOMEDIA)] = "auto-media", /* auto media select active. */
2874 [LOG2U(IFF_DYNAMIC)] = "dynamic", /* dialup device with changing addresses. */
2875 [LOG2U(IFF_LOWER_UP)] = "lower-up", /* driver signals L1 up. */
2876 [LOG2U(IFF_DORMANT)] = "dormant", /* driver signals dormant. */
2877 [LOG2U(IFF_ECHO)] = "echo", /* echo sent packets. */
2878 };
2879
2880 assert(ret);
2881
2882 for (size_t i = 0; i < ELEMENTSOF(map); i++)
2883 if (FLAGS_SET(flags, 1 << i) && map[i])
2884 if (!strextend_with_separator(&str, ",", map[i]))
2885 return -ENOMEM;
2886
2887 *ret = TAKE_PTR(str);
2888 return 0;
2889 }
2890
2891 static const char * const kernel_operstate_table[] = {
2892 [IF_OPER_UNKNOWN] = "unknown",
2893 [IF_OPER_NOTPRESENT] = "not-present",
2894 [IF_OPER_DOWN] = "down",
2895 [IF_OPER_LOWERLAYERDOWN] = "lower-layer-down",
2896 [IF_OPER_TESTING] = "testing",
2897 [IF_OPER_DORMANT] = "dormant",
2898 [IF_OPER_UP] = "up",
2899 };
2900
2901 DEFINE_STRING_TABLE_LOOKUP_TO_STRING(kernel_operstate, int);
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