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Merge pull request #31779 from keszybz/elf2efi-clang-18
[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 r = link_start_dhcp4_server(link);
717 if (r < 0)
718 return log_link_warning_errno(link, r, "Could not start DHCP server: %m");
719
720 r = ipv4acd_start(link);
721 if (r < 0)
722 return log_link_warning_errno(link, r, "Could not start IPv4 ACD client: %m");
723
724 return 0;
725 }
726
727 static int link_acquire_dynamic_conf(Link *link) {
728 int r;
729
730 assert(link);
731 assert(link->network);
732
733 r = link_acquire_dynamic_ipv4_conf(link);
734 if (r < 0)
735 return r;
736
737 if (in6_addr_is_set(&link->ipv6ll_address)) {
738 r = link_acquire_dynamic_ipv6_conf(link);
739 if (r < 0)
740 return r;
741 }
742
743 if (!link_radv_enabled(link) || !link->network->dhcp_pd_announce) {
744 /* DHCPv6PD downstream does not require IPv6LL address. But may require RADV to be
745 * configured, and RADV may not be configured yet here. Only acquire subnet prefix when
746 * RADV is disabled, or the announcement of the prefix is disabled. Otherwise, the
747 * below will be called in radv_start(). */
748 r = dhcp_request_prefix_delegation(link);
749 if (r < 0)
750 return log_link_warning_errno(link, r, "Failed to request DHCP delegated subnet prefix: %m");
751 }
752
753 if (link->lldp_tx) {
754 r = sd_lldp_tx_start(link->lldp_tx);
755 if (r < 0)
756 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
757 }
758
759 if (link->lldp_rx) {
760 r = sd_lldp_rx_start(link->lldp_rx);
761 if (r < 0)
762 return log_link_warning_errno(link, r, "Failed to start LLDP client: %m");
763 }
764
765 return 0;
766 }
767
768 int link_ipv6ll_gained(Link *link) {
769 int r;
770
771 assert(link);
772
773 log_link_info(link, "Gained IPv6LL");
774
775 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
776 return 0;
777
778 r = link_acquire_dynamic_ipv6_conf(link);
779 if (r < 0)
780 return r;
781
782 link_check_ready(link);
783 return 0;
784 }
785
786 int link_handle_bound_to_list(Link *link) {
787 bool required_up = false;
788 bool link_is_up = false;
789 Link *l;
790
791 assert(link);
792
793 /* If at least one interface in bound_to_links has carrier, then make this interface up.
794 * If all interfaces in bound_to_links do not, then make this interface down. */
795
796 if (hashmap_isempty(link->bound_to_links))
797 return 0;
798
799 if (link->flags & IFF_UP)
800 link_is_up = true;
801
802 HASHMAP_FOREACH(l, link->bound_to_links)
803 if (link_has_carrier(l)) {
804 required_up = true;
805 break;
806 }
807
808 if (!required_up && link_is_up)
809 return link_request_to_bring_up_or_down(link, /* up = */ false);
810 if (required_up && !link_is_up)
811 return link_request_to_bring_up_or_down(link, /* up = */ true);
812
813 return 0;
814 }
815
816 static int link_handle_bound_by_list(Link *link) {
817 Link *l;
818 int r;
819
820 assert(link);
821
822 /* Update up or down state of interfaces which depend on this interface's carrier state. */
823
824 if (hashmap_isempty(link->bound_by_links))
825 return 0;
826
827 HASHMAP_FOREACH(l, link->bound_by_links) {
828 r = link_handle_bound_to_list(l);
829 if (r < 0)
830 return r;
831 }
832
833 return 0;
834 }
835
836 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
837 int r;
838
839 assert(link);
840 assert(carrier);
841
842 if (link == carrier)
843 return 0;
844
845 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
846 return 0;
847
848 r = hashmap_ensure_put(h, NULL, INT_TO_PTR(carrier->ifindex), carrier);
849 if (r < 0)
850 return r;
851
852 link_dirty(link);
853
854 return 0;
855 }
856
857 static int link_new_bound_by_list(Link *link) {
858 Manager *m;
859 Link *carrier;
860 int r;
861
862 assert(link);
863 assert(link->manager);
864
865 m = link->manager;
866
867 HASHMAP_FOREACH(carrier, m->links_by_index) {
868 if (!carrier->network)
869 continue;
870
871 if (strv_isempty(carrier->network->bind_carrier))
872 continue;
873
874 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
875 r = link_put_carrier(link, carrier, &link->bound_by_links);
876 if (r < 0)
877 return r;
878 }
879 }
880
881 HASHMAP_FOREACH(carrier, link->bound_by_links) {
882 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
883 if (r < 0)
884 return r;
885 }
886
887 return 0;
888 }
889
890 static int link_new_bound_to_list(Link *link) {
891 Manager *m;
892 Link *carrier;
893 int r;
894
895 assert(link);
896 assert(link->manager);
897
898 if (!link->network)
899 return 0;
900
901 if (strv_isempty(link->network->bind_carrier))
902 return 0;
903
904 m = link->manager;
905
906 HASHMAP_FOREACH(carrier, m->links_by_index) {
907 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
908 r = link_put_carrier(link, carrier, &link->bound_to_links);
909 if (r < 0)
910 return r;
911 }
912 }
913
914 HASHMAP_FOREACH(carrier, link->bound_to_links) {
915 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
916 if (r < 0)
917 return r;
918 }
919
920 return 0;
921 }
922
923 static void link_free_bound_to_list(Link *link) {
924 bool updated = false;
925 Link *bound_to;
926
927 assert(link);
928
929 while ((bound_to = hashmap_steal_first(link->bound_to_links))) {
930 updated = true;
931
932 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
933 link_dirty(bound_to);
934 }
935
936 if (updated)
937 link_dirty(link);
938 }
939
940 static void link_free_bound_by_list(Link *link) {
941 bool updated = false;
942 Link *bound_by;
943
944 assert(link);
945
946 while ((bound_by = hashmap_steal_first(link->bound_by_links))) {
947 updated = true;
948
949 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
950 link_dirty(bound_by);
951 link_handle_bound_to_list(bound_by);
952 }
953 }
954
955 if (updated)
956 link_dirty(link);
957 }
958
959 static int link_append_to_master(Link *link) {
960 Link *master;
961 int r;
962
963 assert(link);
964
965 /* - The link may have no master.
966 * - RTM_NEWLINK message about master interface may not be received yet. */
967 if (link_get_master(link, &master) < 0)
968 return 0;
969
970 r = set_ensure_put(&master->slaves, NULL, link);
971 if (r <= 0)
972 return r;
973
974 link_ref(link);
975 return 0;
976 }
977
978 static void link_drop_from_master(Link *link) {
979 Link *master;
980
981 assert(link);
982
983 if (!link->manager)
984 return;
985
986 if (link_get_master(link, &master) < 0)
987 return;
988
989 link_unref(set_remove(master->slaves, link));
990 }
991
992 static int link_drop_requests(Link *link) {
993 Request *req;
994 int ret = 0;
995
996 assert(link);
997 assert(link->manager);
998
999 ORDERED_SET_FOREACH(req, link->manager->request_queue) {
1000 if (req->link != link)
1001 continue;
1002
1003 /* If the request is already called, but its reply is not received, then we need to
1004 * drop the configuration (e.g. address) here. Note, if the configuration is known,
1005 * it will be handled later by link_drop_foreign_addresses() or so. */
1006 if (req->waiting_reply && link->state != LINK_STATE_LINGER)
1007 switch (req->type) {
1008 case REQUEST_TYPE_ADDRESS: {
1009 Address *address = ASSERT_PTR(req->userdata);
1010
1011 if (address_get(link, address, NULL) < 0)
1012 RET_GATHER(ret, address_remove(address, link));
1013 break;
1014 }
1015 case REQUEST_TYPE_NEIGHBOR: {
1016 Neighbor *neighbor = ASSERT_PTR(req->userdata);
1017
1018 if (neighbor_get(link, neighbor, NULL) < 0)
1019 RET_GATHER(ret, neighbor_remove(neighbor, link));
1020 break;
1021 }
1022 case REQUEST_TYPE_NEXTHOP: {
1023 NextHop *nexthop = ASSERT_PTR(req->userdata);
1024
1025 if (nexthop_get_by_id(link->manager, nexthop->id, NULL) < 0)
1026 RET_GATHER(ret, nexthop_remove(nexthop, link->manager));
1027 break;
1028 }
1029 case REQUEST_TYPE_ROUTE: {
1030 Route *route = ASSERT_PTR(req->userdata);
1031
1032 if (route_get(link->manager, route, NULL) < 0)
1033 RET_GATHER(ret, route_remove(route, link->manager));
1034 break;
1035 }
1036 default:
1037 ;
1038 }
1039
1040 request_detach(req);
1041 }
1042
1043 return ret;
1044 }
1045
1046 static Link *link_drop(Link *link) {
1047 if (!link)
1048 return NULL;
1049
1050 assert(link->manager);
1051
1052 link_set_state(link, LINK_STATE_LINGER);
1053
1054 /* Drop all references from other links and manager. Note that async netlink calls may have
1055 * references to the link, and they will be dropped when we receive replies. */
1056
1057 (void) link_drop_requests(link);
1058
1059 link_free_bound_to_list(link);
1060 link_free_bound_by_list(link);
1061
1062 link_clear_sr_iov_ifindices(link);
1063
1064 link_drop_from_master(link);
1065
1066 if (link->state_file)
1067 (void) unlink(link->state_file);
1068
1069 link_clean(link);
1070
1071 STRV_FOREACH(n, link->alternative_names)
1072 hashmap_remove(link->manager->links_by_name, *n);
1073 hashmap_remove(link->manager->links_by_name, link->ifname);
1074
1075 /* bonding master and its slaves have the same hardware address. */
1076 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
1077
1078 /* The following must be called at last. */
1079 assert_se(hashmap_remove(link->manager->links_by_index, INT_TO_PTR(link->ifindex)) == link);
1080 return link_unref(link);
1081 }
1082
1083 static int link_drop_foreign_config(Link *link) {
1084 int r;
1085
1086 assert(link);
1087 assert(link->manager);
1088
1089 /* Drop foreign config, but ignore unmanaged, loopback, or critical interfaces. We do not want
1090 * to remove loopback address or addresses used for root NFS. */
1091
1092 if (IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
1093 return 0;
1094 if (FLAGS_SET(link->flags, IFF_LOOPBACK))
1095 return 0;
1096 if (link->network->keep_configuration == KEEP_CONFIGURATION_YES)
1097 return 0;
1098
1099 r = link_drop_foreign_routes(link);
1100
1101 RET_GATHER(r, link_drop_foreign_nexthops(link));
1102 RET_GATHER(r, link_drop_foreign_addresses(link));
1103 RET_GATHER(r, link_drop_foreign_neighbors(link));
1104 RET_GATHER(r, manager_drop_foreign_routing_policy_rules(link->manager));
1105
1106 return r;
1107 }
1108
1109 static int link_drop_managed_config(Link *link) {
1110 int r;
1111
1112 assert(link);
1113 assert(link->manager);
1114
1115 r = link_drop_static_routes(link);
1116 RET_GATHER(r, link_drop_static_nexthops(link));
1117 RET_GATHER(r, link_drop_static_addresses(link));
1118 RET_GATHER(r, link_drop_static_neighbors(link));
1119 RET_GATHER(r, link_drop_static_routing_policy_rules(link));
1120
1121 return r;
1122 }
1123
1124 static void link_foreignize_config(Link *link) {
1125 assert(link);
1126 assert(link->manager);
1127
1128 link_foreignize_routes(link);
1129 link_foreignize_nexthops(link);
1130 link_foreignize_addresses(link);
1131 link_foreignize_neighbors(link);
1132 link_foreignize_routing_policy_rules(link);
1133 }
1134
1135 static int link_configure(Link *link) {
1136 int r;
1137
1138 assert(link);
1139 assert(link->network);
1140 assert(link->state == LINK_STATE_INITIALIZED);
1141
1142 link_set_state(link, LINK_STATE_CONFIGURING);
1143
1144 r = link_new_bound_to_list(link);
1145 if (r < 0)
1146 return r;
1147
1148 r = link_request_traffic_control(link);
1149 if (r < 0)
1150 return r;
1151
1152 r = link_configure_mtu(link);
1153 if (r < 0)
1154 return r;
1155
1156 if (link->iftype == ARPHRD_CAN) {
1157 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1158 r = link_request_to_set_can(link);
1159 if (r < 0)
1160 return r;
1161
1162 return link_request_to_activate(link);
1163 }
1164
1165 r = link_request_sr_iov_vfs(link);
1166 if (r < 0)
1167 return r;
1168
1169 r = link_set_sysctl(link);
1170 if (r < 0)
1171 return r;
1172
1173 r = link_request_to_set_mac(link, /* allow_retry = */ true);
1174 if (r < 0)
1175 return r;
1176
1177 r = link_request_to_set_ipoib(link);
1178 if (r < 0)
1179 return r;
1180
1181 r = link_request_to_set_flags(link);
1182 if (r < 0)
1183 return r;
1184
1185 r = link_request_to_set_group(link);
1186 if (r < 0)
1187 return r;
1188
1189 r = link_request_to_set_addrgen_mode(link);
1190 if (r < 0)
1191 return r;
1192
1193 r = link_request_to_set_master(link);
1194 if (r < 0)
1195 return r;
1196
1197 r = link_request_stacked_netdevs(link);
1198 if (r < 0)
1199 return r;
1200
1201 r = link_request_to_set_bond(link);
1202 if (r < 0)
1203 return r;
1204
1205 r = link_request_to_set_bridge(link);
1206 if (r < 0)
1207 return r;
1208
1209 r = link_request_to_set_bridge_vlan(link);
1210 if (r < 0)
1211 return r;
1212
1213 r = link_request_to_activate(link);
1214 if (r < 0)
1215 return r;
1216
1217 r = ipv4ll_configure(link);
1218 if (r < 0)
1219 return r;
1220
1221 r = link_request_dhcp4_client(link);
1222 if (r < 0)
1223 return r;
1224
1225 r = link_request_dhcp6_client(link);
1226 if (r < 0)
1227 return r;
1228
1229 r = link_request_ndisc(link);
1230 if (r < 0)
1231 return r;
1232
1233 r = link_request_dhcp_server(link);
1234 if (r < 0)
1235 return r;
1236
1237 r = link_request_radv(link);
1238 if (r < 0)
1239 return r;
1240
1241 r = link_lldp_rx_configure(link);
1242 if (r < 0)
1243 return r;
1244
1245 r = link_lldp_tx_configure(link);
1246 if (r < 0)
1247 return r;
1248
1249 r = link_drop_foreign_config(link);
1250 if (r < 0)
1251 return r;
1252
1253 r = link_request_static_configs(link);
1254 if (r < 0)
1255 return r;
1256
1257 if (!link_has_carrier(link))
1258 return 0;
1259
1260 return link_acquire_dynamic_conf(link);
1261 }
1262
1263 static int link_get_network(Link *link, Network **ret) {
1264 Network *network;
1265 int r;
1266
1267 assert(link);
1268 assert(link->manager);
1269 assert(ret);
1270
1271 ORDERED_HASHMAP_FOREACH(network, link->manager->networks) {
1272 bool warn = false;
1273
1274 r = net_match_config(
1275 &network->match,
1276 link->dev,
1277 &link->hw_addr,
1278 &link->permanent_hw_addr,
1279 link->driver,
1280 link->iftype,
1281 link->kind,
1282 link->ifname,
1283 link->alternative_names,
1284 link->wlan_iftype,
1285 link->ssid,
1286 &link->bssid);
1287 if (r < 0)
1288 return r;
1289 if (r == 0)
1290 continue;
1291
1292 if (network->match.ifname && link->dev) {
1293 uint8_t name_assign_type = NET_NAME_UNKNOWN;
1294 const char *attr;
1295
1296 if (sd_device_get_sysattr_value(link->dev, "name_assign_type", &attr) >= 0)
1297 (void) safe_atou8(attr, &name_assign_type);
1298
1299 warn = name_assign_type == NET_NAME_ENUM;
1300 }
1301
1302 log_link_full(link, warn ? LOG_WARNING : LOG_DEBUG,
1303 "found matching network '%s'%s.",
1304 network->filename,
1305 warn ? ", based on potentially unpredictable interface name" : "");
1306
1307 if (network->unmanaged)
1308 return -ENOENT;
1309
1310 *ret = network;
1311 return 0;
1312 }
1313
1314 return -ENOENT;
1315 }
1316
1317 int link_reconfigure_impl(Link *link, bool force) {
1318 Network *network = NULL;
1319 NetDev *netdev = NULL;
1320 int r;
1321
1322 assert(link);
1323
1324 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
1325 return 0;
1326
1327 r = netdev_get(link->manager, link->ifname, &netdev);
1328 if (r < 0 && r != -ENOENT)
1329 return r;
1330
1331 r = link_get_network(link, &network);
1332 if (r < 0 && r != -ENOENT)
1333 return r;
1334
1335 if (link->state != LINK_STATE_UNMANAGED && !network)
1336 /* If link is in initialized state, then link->network is also NULL. */
1337 force = true;
1338
1339 if (link->network == network && !force)
1340 return 0;
1341
1342 if (network) {
1343 _cleanup_free_ char *joined = strv_join(network->dropins, ", ");
1344
1345 if (link->state == LINK_STATE_INITIALIZED)
1346 log_link_info(link, "Configuring with %s%s%s%s.",
1347 network->filename,
1348 isempty(joined) ? "" : " (dropins: ",
1349 joined,
1350 isempty(joined) ? "" : ")");
1351 else
1352 log_link_info(link, "Reconfiguring with %s%s%s%s.",
1353 network->filename,
1354 isempty(joined) ? "" : " (dropins: ",
1355 joined,
1356 isempty(joined) ? "" : ")");
1357 } else
1358 log_link_full(link, link->state == LINK_STATE_INITIALIZED ? LOG_DEBUG : LOG_INFO,
1359 "Unmanaging interface.");
1360
1361 /* Dropping old .network file */
1362 r = link_stop_engines(link, false);
1363 if (r < 0)
1364 return r;
1365
1366 r = link_drop_requests(link);
1367 if (r < 0)
1368 return r;
1369
1370 if (network && !force && network->keep_configuration != KEEP_CONFIGURATION_YES)
1371 /* When a new/updated .network file is assigned, first make all configs (addresses,
1372 * routes, and so on) foreign, and then drop unnecessary configs later by
1373 * link_drop_foreign_config() in link_configure().
1374 * Note, when KeepConfiguration=yes, link_drop_foreign_config() does nothing. Hence,
1375 * here we need to drop the configs such as addresses, routes, and so on configured by
1376 * the previously assigned .network file. */
1377 link_foreignize_config(link);
1378 else {
1379 /* Remove all managed configs. Note, foreign configs are removed in later by
1380 * link_configure() -> link_drop_foreign_config() if the link is managed by us. */
1381 r = link_drop_managed_config(link);
1382 if (r < 0)
1383 return r;
1384 }
1385
1386 /* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the
1387 * bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will
1388 * not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the
1389 * map here, as it depends on .network files assigned to other links. */
1390 link_free_bound_to_list(link);
1391
1392 link_free_engines(link);
1393 link->network = network_unref(link->network);
1394
1395 netdev_unref(link->netdev);
1396 link->netdev = netdev_ref(netdev);
1397
1398 if (!network) {
1399 link_set_state(link, LINK_STATE_UNMANAGED);
1400 return 0;
1401 }
1402
1403 /* Then, apply new .network file */
1404 link->network = network_ref(network);
1405 link_update_operstate(link, true);
1406 link_dirty(link);
1407
1408 link_set_state(link, LINK_STATE_INITIALIZED);
1409 link->activated = false;
1410
1411 r = link_configure(link);
1412 if (r < 0)
1413 return r;
1414
1415 return 1;
1416 }
1417
1418 static int link_reconfigure_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, bool force) {
1419 int r;
1420
1421 assert(link);
1422
1423 r = link_getlink_handler_internal(rtnl, m, link, "Failed to update link state");
1424 if (r <= 0)
1425 return r;
1426
1427 r = link_reconfigure_impl(link, force);
1428 if (r < 0) {
1429 link_enter_failed(link);
1430 return 0;
1431 }
1432
1433 return r;
1434 }
1435
1436 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1437 return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ false);
1438 }
1439
1440 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1441 return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ true);
1442 }
1443
1444 int link_reconfigure(Link *link, bool force) {
1445 int r;
1446
1447 assert(link);
1448
1449 /* When link in pending or initialized state, then link_configure() will be called. To prevent
1450 * the function from being called multiple times simultaneously, refuse to reconfigure the
1451 * interface in these cases. */
1452 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
1453 return 0; /* 0 means no-op. */
1454
1455 r = link_call_getlink(link, force ? link_force_reconfigure_handler : link_reconfigure_handler);
1456 if (r < 0)
1457 return r;
1458
1459 return 1; /* 1 means the interface will be reconfigured. */
1460 }
1461
1462 typedef struct ReconfigureData {
1463 Link *link;
1464 Manager *manager;
1465 sd_bus_message *message;
1466 } ReconfigureData;
1467
1468 static void reconfigure_data_destroy_callback(ReconfigureData *data) {
1469 int r;
1470
1471 assert(data);
1472 assert(data->link);
1473 assert(data->manager);
1474 assert(data->manager->reloading > 0);
1475 assert(data->message);
1476
1477 link_unref(data->link);
1478
1479 data->manager->reloading--;
1480 if (data->manager->reloading <= 0) {
1481 r = sd_bus_reply_method_return(data->message, NULL);
1482 if (r < 0)
1483 log_warning_errno(r, "Failed to send reply for 'Reload' DBus method, ignoring: %m");
1484 }
1485
1486 sd_bus_message_unref(data->message);
1487 free(data);
1488 }
1489
1490 static int reconfigure_handler_on_bus_method_reload(sd_netlink *rtnl, sd_netlink_message *m, ReconfigureData *data) {
1491 assert(data);
1492 assert(data->link);
1493 return link_reconfigure_handler_internal(rtnl, m, data->link, /* force = */ false);
1494 }
1495
1496 int link_reconfigure_on_bus_method_reload(Link *link, sd_bus_message *message) {
1497 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1498 _cleanup_free_ ReconfigureData *data = NULL;
1499 int r;
1500
1501 assert(link);
1502 assert(link->manager);
1503 assert(link->manager->rtnl);
1504 assert(message);
1505
1506 /* See comments in link_reconfigure() above. */
1507 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
1508 return 0;
1509
1510 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
1511 if (r < 0)
1512 return r;
1513
1514 data = new(ReconfigureData, 1);
1515 if (!data)
1516 return -ENOMEM;
1517
1518 r = netlink_call_async(link->manager->rtnl, NULL, req,
1519 reconfigure_handler_on_bus_method_reload,
1520 reconfigure_data_destroy_callback, data);
1521 if (r < 0)
1522 return r;
1523
1524 *data = (ReconfigureData) {
1525 .link = link_ref(link),
1526 .manager = link->manager,
1527 .message = sd_bus_message_ref(message),
1528 };
1529
1530 link->manager->reloading++;
1531
1532 TAKE_PTR(data);
1533 return 0;
1534 }
1535
1536 static int link_initialized_and_synced(Link *link) {
1537 int r;
1538
1539 assert(link);
1540 assert(link->manager);
1541
1542 if (link->manager->test_mode) {
1543 log_link_debug(link, "Running in test mode, refusing to enter initialized state.");
1544 link_set_state(link, LINK_STATE_UNMANAGED);
1545 return 0;
1546 }
1547
1548 if (link->state == LINK_STATE_PENDING) {
1549 log_link_debug(link, "Link state is up-to-date");
1550 link_set_state(link, LINK_STATE_INITIALIZED);
1551
1552 r = link_new_bound_by_list(link);
1553 if (r < 0)
1554 return r;
1555
1556 r = link_handle_bound_by_list(link);
1557 if (r < 0)
1558 return r;
1559 }
1560
1561 return link_reconfigure_impl(link, /* force = */ false);
1562 }
1563
1564 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1565 int r;
1566
1567 r = link_getlink_handler_internal(rtnl, m, link, "Failed to wait for the interface to be initialized");
1568 if (r <= 0)
1569 return r;
1570
1571 r = link_initialized_and_synced(link);
1572 if (r < 0)
1573 link_enter_failed(link);
1574
1575 return 0;
1576 }
1577
1578 static int link_initialized(Link *link, sd_device *device) {
1579 int r;
1580
1581 assert(link);
1582 assert(device);
1583
1584 /* Always replace with the new sd_device object. As the sysname (and possibly other properties
1585 * or sysattrs) may be outdated. */
1586 device_unref_and_replace(link->dev, device);
1587
1588 if (link->dhcp_client) {
1589 r = sd_dhcp_client_attach_device(link->dhcp_client, link->dev);
1590 if (r < 0)
1591 log_link_warning_errno(link, r, "Failed to attach device to DHCPv4 client, ignoring: %m");
1592 }
1593
1594 if (link->dhcp6_client) {
1595 r = sd_dhcp6_client_attach_device(link->dhcp6_client, link->dev);
1596 if (r < 0)
1597 log_link_warning_errno(link, r, "Failed to attach device to DHCPv6 client, ignoring: %m");
1598 }
1599
1600 r = link_set_sr_iov_ifindices(link);
1601 if (r < 0)
1602 log_link_warning_errno(link, r, "Failed to manage SR-IOV PF and VF ports, ignoring: %m");
1603
1604 if (link->state != LINK_STATE_PENDING)
1605 return link_reconfigure(link, /* force = */ false);
1606
1607 log_link_debug(link, "udev initialized link");
1608
1609 /* udev has initialized the link, but we don't know if we have yet
1610 * processed the NEWLINK messages with the latest state. Do a GETLINK,
1611 * when it returns we know that the pending NEWLINKs have already been
1612 * processed and that we are up-to-date */
1613
1614 return link_call_getlink(link, link_initialized_handler);
1615 }
1616
1617 static int link_check_initialized(Link *link) {
1618 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
1619 int r;
1620
1621 assert(link);
1622
1623 if (!udev_available())
1624 return link_initialized_and_synced(link);
1625
1626 /* udev should be around */
1627 r = sd_device_new_from_ifindex(&device, link->ifindex);
1628 if (r < 0) {
1629 log_link_debug_errno(link, r, "Could not find device, waiting for device initialization: %m");
1630 return 0;
1631 }
1632
1633 r = sd_device_get_is_initialized(device);
1634 if (r < 0)
1635 return log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
1636 if (r == 0) {
1637 /* not yet ready */
1638 log_link_debug(link, "link pending udev initialization...");
1639 return 0;
1640 }
1641
1642 r = device_is_renaming(device);
1643 if (r < 0)
1644 return log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
1645 if (r > 0) {
1646 log_link_debug(link, "Interface is being renamed, pending initialization.");
1647 return 0;
1648 }
1649
1650 r = device_is_processing(device);
1651 if (r < 0)
1652 return log_link_warning_errno(link, r, "Failed to determine whether the device is being processed: %m");
1653 if (r > 0) {
1654 log_link_debug(link, "Interface is being processed by udevd, pending initialization.");
1655 return 0;
1656 }
1657
1658 return link_initialized(link, device);
1659 }
1660
1661 int manager_udev_process_link(Manager *m, sd_device *device, sd_device_action_t action) {
1662 int r, ifindex;
1663 const char *s;
1664 Link *link;
1665
1666 assert(m);
1667 assert(device);
1668
1669 r = sd_device_get_ifindex(device, &ifindex);
1670 if (r < 0)
1671 return log_device_debug_errno(device, r, "Failed to get ifindex: %m");
1672
1673 r = link_get_by_index(m, ifindex, &link);
1674 if (r < 0) {
1675 /* This error is not critical, as the corresponding rtnl message may be received later. */
1676 log_device_debug_errno(device, r, "Failed to get link from ifindex %i, ignoring: %m", ifindex);
1677 return 0;
1678 }
1679
1680 /* Let's unref the sd-device object assigned to the corresponding Link object, but keep the Link
1681 * object here. It will be removed only when rtnetlink says so. */
1682 if (action == SD_DEVICE_REMOVE) {
1683 link->dev = sd_device_unref(link->dev);
1684 return 0;
1685 }
1686
1687 r = device_is_renaming(device);
1688 if (r < 0)
1689 return log_device_debug_errno(device, r, "Failed to determine if the device is renaming or not: %m");
1690 if (r > 0) {
1691 log_device_debug(device, "Device is renaming, waiting for the interface to be renamed.");
1692 /* TODO:
1693 * What happens when a device is initialized, then soon renamed after that? When we detect
1694 * such, maybe we should cancel or postpone all queued requests for the interface. */
1695 return 0;
1696 }
1697
1698 r = sd_device_get_property_value(device, "ID_NET_MANAGED_BY", &s);
1699 if (r < 0 && r != -ENOENT)
1700 log_device_debug_errno(device, r, "Failed to get ID_NET_MANAGED_BY udev property, ignoring: %m");
1701 if (r >= 0 && !streq(s, "io.systemd.Network")) {
1702 log_device_debug(device, "Interface is requested to be managed by '%s', not managing the interface.", s);
1703 link_set_state(link, LINK_STATE_UNMANAGED);
1704 return 0;
1705 }
1706
1707 r = link_initialized(link, device);
1708 if (r < 0)
1709 link_enter_failed(link);
1710
1711 return 0;
1712 }
1713
1714 static int link_carrier_gained(Link *link) {
1715 bool force_reconfigure;
1716 int r;
1717
1718 assert(link);
1719
1720 r = event_source_disable(link->carrier_lost_timer);
1721 if (r < 0)
1722 log_link_warning_errno(link, r, "Failed to disable carrier lost timer, ignoring: %m");
1723
1724 /* If a wireless interface was connected to an access point, and the SSID is changed (that is,
1725 * both previous_ssid and ssid are non-NULL), then the connected wireless network could be
1726 * changed. So, always reconfigure the link. Which means e.g. the DHCP client will be
1727 * restarted, and the correct network information will be gained.
1728 *
1729 * However, do not reconfigure the wireless interface forcibly if it was not connected to any
1730 * access points previously (previous_ssid is NULL in this case). As, a .network file may be
1731 * already assigned to the interface (in that case, the .network file does not have the SSID=
1732 * setting in the [Match] section), and the interface is already being configured. Of course,
1733 * there may exist another .network file with higher priority and a matching SSID= setting. But
1734 * in that case, link_reconfigure_impl() can handle that without the force_reconfigure flag.
1735 *
1736 * For non-wireless interfaces, we have no way to detect the connected network change. So,
1737 * setting force_reconfigure = false. Note, both ssid and previous_ssid are NULL in that case. */
1738 force_reconfigure = link->previous_ssid && !streq_ptr(link->previous_ssid, link->ssid);
1739 link->previous_ssid = mfree(link->previous_ssid);
1740
1741 /* AP and P2P-GO interfaces may have a new SSID - update the link properties in case a new .network
1742 * profile wants to match on it with SSID= in its [Match] section.
1743 */
1744 if (IN_SET(link->wlan_iftype, NL80211_IFTYPE_AP, NL80211_IFTYPE_P2P_GO)) {
1745 r = link_get_wlan_interface(link);
1746 if (r < 0)
1747 return r;
1748 }
1749
1750 /* At this stage, both wlan and link information should be up-to-date. Hence, it is not necessary to
1751 * call RTM_GETLINK, NL80211_CMD_GET_INTERFACE, or NL80211_CMD_GET_STATION commands, and simply call
1752 * link_reconfigure_impl(). Note, link_reconfigure_impl() returns 1 when the link is reconfigured. */
1753 r = link_reconfigure_impl(link, force_reconfigure);
1754 if (r != 0)
1755 return r;
1756
1757 r = link_handle_bound_by_list(link);
1758 if (r < 0)
1759 return r;
1760
1761 if (link->iftype == ARPHRD_CAN)
1762 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1763 return 0;
1764
1765 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
1766 r = link_acquire_dynamic_conf(link);
1767 if (r < 0)
1768 return r;
1769
1770 r = link_request_static_configs(link);
1771 if (r < 0)
1772 return r;
1773 }
1774
1775 return 0;
1776 }
1777
1778 static int link_carrier_lost_impl(Link *link) {
1779 int r, ret = 0;
1780
1781 assert(link);
1782
1783 link->previous_ssid = mfree(link->previous_ssid);
1784
1785 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1786 return 0;
1787
1788 if (!link->network)
1789 return 0;
1790
1791 r = link_stop_engines(link, false);
1792 if (r < 0)
1793 ret = r;
1794
1795 r = link_drop_managed_config(link);
1796 if (r < 0 && ret >= 0)
1797 ret = r;
1798
1799 return ret;
1800 }
1801
1802 static int link_carrier_lost_handler(sd_event_source *s, uint64_t usec, void *userdata) {
1803 Link *link = ASSERT_PTR(userdata);
1804 int r;
1805
1806 r = link_carrier_lost_impl(link);
1807 if (r < 0) {
1808 log_link_warning_errno(link, r, "Failed to process carrier lost event: %m");
1809 link_enter_failed(link);
1810 }
1811
1812 return 0;
1813 }
1814
1815 static int link_carrier_lost(Link *link) {
1816 uint16_t dhcp_mtu;
1817 usec_t usec;
1818 int r;
1819
1820 assert(link);
1821
1822 r = link_handle_bound_by_list(link);
1823 if (r < 0)
1824 return r;
1825
1826 if (link->iftype == ARPHRD_CAN)
1827 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1828 return 0;
1829
1830 if (!link->network)
1831 return 0;
1832
1833 if (link->network->ignore_carrier_loss_set)
1834 /* If IgnoreCarrierLoss= is explicitly specified, then use the specified value. */
1835 usec = link->network->ignore_carrier_loss_usec;
1836
1837 else if (link->network->bond && link->wlan_iftype > 0)
1838 /* Enslaving wlan interface to a bond disconnects from the connected AP, and causes its
1839 * carrier to be lost. See #19832. */
1840 usec = 3 * USEC_PER_SEC;
1841
1842 else if (link->network->dhcp_use_mtu &&
1843 link->dhcp_lease &&
1844 sd_dhcp_lease_get_mtu(link->dhcp_lease, &dhcp_mtu) >= 0 &&
1845 dhcp_mtu != link->original_mtu)
1846 /* Some drivers reset interfaces when changing MTU. Resetting interfaces by the static
1847 * MTU should not cause any issues, as MTU is changed only once. However, setting MTU
1848 * through DHCP lease causes an infinite loop of resetting the interface. See #18738. */
1849 usec = 5 * USEC_PER_SEC;
1850
1851 else
1852 /* Otherwise, use the implied default value. */
1853 usec = link->network->ignore_carrier_loss_usec;
1854
1855 if (usec == USEC_INFINITY)
1856 return 0;
1857
1858 if (usec == 0)
1859 return link_carrier_lost_impl(link);
1860
1861 return event_reset_time_relative(link->manager->event,
1862 &link->carrier_lost_timer,
1863 CLOCK_BOOTTIME,
1864 usec,
1865 0,
1866 link_carrier_lost_handler,
1867 link,
1868 0,
1869 "link-carrier-loss",
1870 true);
1871 }
1872
1873 static int link_admin_state_up(Link *link) {
1874 int r;
1875
1876 assert(link);
1877
1878 /* This is called every time an interface admin state changes to up;
1879 * specifically, when IFF_UP flag changes from unset to set. */
1880
1881 if (!link->network)
1882 return 0;
1883
1884 if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_DOWN) {
1885 log_link_info(link, "Activation policy is \"always-down\", forcing link down.");
1886 return link_request_to_bring_up_or_down(link, /* up = */ false);
1887 }
1888
1889 /* We set the ipv6 mtu after the device mtu, but the kernel resets
1890 * ipv6 mtu on NETDEV_UP, so we need to reset it. */
1891 r = link_set_ipv6_mtu(link);
1892 if (r < 0)
1893 log_link_warning_errno(link, r, "Cannot set IPv6 MTU, ignoring: %m");
1894
1895 return 0;
1896 }
1897
1898 static int link_admin_state_down(Link *link) {
1899 assert(link);
1900
1901 if (!link->network)
1902 return 0;
1903
1904 if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) {
1905 log_link_info(link, "Activation policy is \"always-up\", forcing link up.");
1906 return link_request_to_bring_up_or_down(link, /* up = */ true);
1907 }
1908
1909 return 0;
1910 }
1911
1912 static bool link_is_enslaved(Link *link) {
1913 if (link->flags & IFF_SLAVE)
1914 return true;
1915
1916 if (link->master_ifindex > 0)
1917 return true;
1918
1919 return false;
1920 }
1921
1922 void link_update_operstate(Link *link, bool also_update_master) {
1923 LinkOperationalState operstate;
1924 LinkCarrierState carrier_state;
1925 LinkAddressState ipv4_address_state, ipv6_address_state, address_state;
1926 LinkOnlineState online_state;
1927 _cleanup_strv_free_ char **p = NULL;
1928 bool changed = false;
1929
1930 assert(link);
1931
1932 if (link->kernel_operstate == IF_OPER_DORMANT)
1933 carrier_state = LINK_CARRIER_STATE_DORMANT;
1934 else if (link_has_carrier(link)) {
1935 if (link_is_enslaved(link))
1936 carrier_state = LINK_CARRIER_STATE_ENSLAVED;
1937 else
1938 carrier_state = LINK_CARRIER_STATE_CARRIER;
1939 } else if (link->flags & IFF_UP)
1940 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
1941 else
1942 carrier_state = LINK_CARRIER_STATE_OFF;
1943
1944 if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
1945 Link *slave;
1946
1947 SET_FOREACH(slave, link->slaves) {
1948 link_update_operstate(slave, false);
1949
1950 if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
1951 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
1952 }
1953 }
1954
1955 link_get_address_states(link, &ipv4_address_state, &ipv6_address_state, &address_state);
1956
1957 /* Mapping of address and carrier state vs operational state
1958 * carrier state
1959 * | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
1960 * ------------------------------------------------------------------------------
1961 * off | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
1962 * address_state degraded | off | no-carrier | dormant | degraded | degraded | enslaved
1963 * routable | off | no-carrier | dormant | routable | routable | routable
1964 */
1965
1966 if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_ROUTABLE)
1967 operstate = LINK_OPERSTATE_ROUTABLE;
1968 else if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_DEGRADED)
1969 operstate = LINK_OPERSTATE_DEGRADED;
1970 else if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
1971 operstate = (LinkOperationalState) carrier_state;
1972 else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
1973 operstate = LINK_OPERSTATE_ROUTABLE;
1974 else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
1975 operstate = LINK_OPERSTATE_DEGRADED;
1976 else
1977 operstate = LINK_OPERSTATE_ENSLAVED;
1978
1979 LinkOperationalStateRange req;
1980 link_required_operstate_for_online(link, &req);
1981
1982 /* Only determine online state for managed links with RequiredForOnline=yes */
1983 if (!link->network || !link->network->required_for_online)
1984 online_state = _LINK_ONLINE_STATE_INVALID;
1985
1986 else if (!operational_state_is_in_range(operstate, &req))
1987 online_state = LINK_ONLINE_STATE_OFFLINE;
1988
1989 else {
1990 AddressFamily required_family = link_required_family_for_online(link);
1991 bool needs_ipv4 = required_family & ADDRESS_FAMILY_IPV4;
1992 bool needs_ipv6 = required_family & ADDRESS_FAMILY_IPV6;
1993
1994 /* The operational state is within the range required for online.
1995 * If a particular address family is also required, we might revert
1996 * to offline in the blocks below. */
1997 online_state = LINK_ONLINE_STATE_ONLINE;
1998
1999 if (req.min >= LINK_OPERSTATE_DEGRADED) {
2000 if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_DEGRADED)
2001 online_state = LINK_ONLINE_STATE_OFFLINE;
2002 if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_DEGRADED)
2003 online_state = LINK_ONLINE_STATE_OFFLINE;
2004 }
2005
2006 if (req.min >= LINK_OPERSTATE_ROUTABLE) {
2007 if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_ROUTABLE)
2008 online_state = LINK_ONLINE_STATE_OFFLINE;
2009 if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_ROUTABLE)
2010 online_state = LINK_ONLINE_STATE_OFFLINE;
2011 }
2012 }
2013
2014 if (link->carrier_state != carrier_state) {
2015 link->carrier_state = carrier_state;
2016 changed = true;
2017 if (strv_extend(&p, "CarrierState") < 0)
2018 log_oom();
2019 }
2020
2021 if (link->address_state != address_state) {
2022 link->address_state = address_state;
2023 changed = true;
2024 if (strv_extend(&p, "AddressState") < 0)
2025 log_oom();
2026 }
2027
2028 if (link->ipv4_address_state != ipv4_address_state) {
2029 link->ipv4_address_state = ipv4_address_state;
2030 changed = true;
2031 if (strv_extend(&p, "IPv4AddressState") < 0)
2032 log_oom();
2033 }
2034
2035 if (link->ipv6_address_state != ipv6_address_state) {
2036 link->ipv6_address_state = ipv6_address_state;
2037 changed = true;
2038 if (strv_extend(&p, "IPv6AddressState") < 0)
2039 log_oom();
2040 }
2041
2042 if (link->operstate != operstate) {
2043 link->operstate = operstate;
2044 changed = true;
2045 if (strv_extend(&p, "OperationalState") < 0)
2046 log_oom();
2047 }
2048
2049 if (link->online_state != online_state) {
2050 link->online_state = online_state;
2051 changed = true;
2052 if (strv_extend(&p, "OnlineState") < 0)
2053 log_oom();
2054 }
2055
2056 if (p)
2057 link_send_changed_strv(link, p);
2058 if (changed)
2059 link_dirty(link);
2060
2061 if (also_update_master) {
2062 Link *master;
2063
2064 if (link_get_master(link, &master) >= 0)
2065 link_update_operstate(master, true);
2066 }
2067 }
2068
2069 #define FLAG_STRING(string, flag, old, new) \
2070 (((old ^ new) & flag) \
2071 ? ((old & flag) ? (" -" string) : (" +" string)) \
2072 : "")
2073
2074 static int link_update_flags(Link *link, sd_netlink_message *message) {
2075 bool link_was_admin_up, had_carrier;
2076 uint8_t operstate;
2077 unsigned flags;
2078 int r;
2079
2080 assert(link);
2081 assert(message);
2082
2083 r = sd_rtnl_message_link_get_flags(message, &flags);
2084 if (r < 0)
2085 return log_link_debug_errno(link, r, "rtnl: failed to read link flags: %m");
2086
2087 r = sd_netlink_message_read_u8(message, IFLA_OPERSTATE, &operstate);
2088 if (r == -ENODATA)
2089 /* If we got a message without operstate, assume the state was unchanged. */
2090 operstate = link->kernel_operstate;
2091 else if (r < 0)
2092 return log_link_debug_errno(link, r, "rtnl: failed to read operational state: %m");
2093
2094 if (link->flags == flags && link->kernel_operstate == operstate)
2095 return 0;
2096
2097 if (link->flags != flags) {
2098 unsigned unknown_flags, unknown_flags_added, unknown_flags_removed;
2099
2100 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",
2101 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
2102 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
2103 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
2104 FLAG_STRING("UP", IFF_UP, link->flags, flags),
2105 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
2106 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
2107 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
2108 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
2109 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
2110 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
2111 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
2112 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
2113 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
2114 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
2115 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
2116 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
2117 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
2118 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
2119 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
2120
2121 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
2122 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
2123 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
2124 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
2125 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
2126 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
2127 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
2128 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
2129
2130 if (unknown_flags_added)
2131 log_link_debug(link, "Unknown link flags gained, ignoring: %#.5x", unknown_flags_added);
2132
2133 if (unknown_flags_removed)
2134 log_link_debug(link, "Unknown link flags lost, ignoring: %#.5x", unknown_flags_removed);
2135 }
2136
2137 link_was_admin_up = link->flags & IFF_UP;
2138 had_carrier = link_has_carrier(link);
2139
2140 link->flags = flags;
2141 link->kernel_operstate = operstate;
2142
2143 link_update_operstate(link, true);
2144
2145 if (!link_was_admin_up && (link->flags & IFF_UP)) {
2146 log_link_info(link, "Link UP");
2147
2148 r = link_admin_state_up(link);
2149 if (r < 0)
2150 return r;
2151 } else if (link_was_admin_up && !(link->flags & IFF_UP)) {
2152 log_link_info(link, "Link DOWN");
2153
2154 r = link_admin_state_down(link);
2155 if (r < 0)
2156 return r;
2157 }
2158
2159 if (!had_carrier && link_has_carrier(link)) {
2160 log_link_info(link, "Gained carrier");
2161
2162 r = link_carrier_gained(link);
2163 if (r < 0)
2164 return r;
2165 } else if (had_carrier && !link_has_carrier(link)) {
2166 log_link_info(link, "Lost carrier");
2167
2168 r = link_carrier_lost(link);
2169 if (r < 0)
2170 return r;
2171 }
2172
2173 return 0;
2174 }
2175
2176 static int link_update_master(Link *link, sd_netlink_message *message) {
2177 int master_ifindex, r;
2178
2179 assert(link);
2180 assert(message);
2181
2182 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t*) &master_ifindex);
2183 if (r == -ENODATA)
2184 return 0;
2185 if (r < 0)
2186 return log_link_debug_errno(link, r, "rtnl: failed to read master ifindex: %m");
2187
2188 if (master_ifindex == link->ifindex)
2189 master_ifindex = 0;
2190
2191 if (master_ifindex != link->master_ifindex) {
2192 if (link->master_ifindex == 0)
2193 log_link_debug(link, "Attached to master interface: %i", master_ifindex);
2194 else if (master_ifindex == 0)
2195 log_link_debug(link, "Detached from master interface: %i", link->master_ifindex);
2196 else
2197 log_link_debug(link, "Master interface changed: %i %s %i", link->master_ifindex,
2198 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), master_ifindex);
2199
2200 link_drop_from_master(link);
2201 link->master_ifindex = master_ifindex;
2202 }
2203
2204 r = link_append_to_master(link);
2205 if (r < 0)
2206 return log_link_debug_errno(link, r, "Failed to append link to master: %m");
2207
2208 return 0;
2209 }
2210
2211 static int link_update_driver(Link *link, sd_netlink_message *message) {
2212 int r;
2213
2214 assert(link);
2215 assert(link->manager);
2216 assert(message);
2217
2218 /* Driver is already read. Assuming the driver is never changed. */
2219 if (link->ethtool_driver_read)
2220 return 0;
2221
2222 /* When udevd is running, read the driver after the interface is initialized by udevd.
2223 * Otherwise, ethtool may not work correctly. See issue #22538.
2224 * When udevd is not running, read the value when the interface is detected. */
2225 if (udev_available() && !link->dev)
2226 return 0;
2227
2228 link->ethtool_driver_read = true;
2229
2230 r = ethtool_get_driver(&link->manager->ethtool_fd, link->ifname, &link->driver);
2231 if (r < 0) {
2232 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
2233 return 0;
2234 }
2235
2236 log_link_debug(link, "Found driver: %s", strna(link->driver));
2237
2238 if (streq_ptr(link->driver, "dsa")) {
2239 uint32_t dsa_master_ifindex = 0;
2240
2241 r = sd_netlink_message_read_u32(message, IFLA_LINK, &dsa_master_ifindex);
2242 if (r < 0 && r != -ENODATA)
2243 return log_link_debug_errno(link, r, "rtnl: failed to read ifindex of the DSA master interface: %m");
2244
2245 if (dsa_master_ifindex > INT_MAX) {
2246 log_link_debug(link, "rtnl: received too large DSA master ifindex (%"PRIu32" > INT_MAX), ignoring.",
2247 dsa_master_ifindex);
2248 dsa_master_ifindex = 0;
2249 }
2250
2251 link->dsa_master_ifindex = (int) dsa_master_ifindex;
2252 }
2253
2254 return 1; /* needs reconfigure */
2255 }
2256
2257 static int link_update_permanent_hardware_address_from_ethtool(Link *link, sd_netlink_message *message) {
2258 int r;
2259
2260 assert(link);
2261 assert(link->manager);
2262 assert(message);
2263
2264 if (link->ethtool_permanent_hw_addr_read)
2265 return 0;
2266
2267 /* When udevd is running, read the permanent hardware address after the interface is
2268 * initialized by udevd. Otherwise, ethtool may not work correctly. See issue #22538.
2269 * When udevd is not running, read the value when the interface is detected. */
2270 if (udev_available() && !link->dev)
2271 return 0;
2272
2273 /* If the interface does not have a hardware address, then it will not have a permanent address either. */
2274 r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, NULL);
2275 if (r == -ENODATA)
2276 return 0;
2277 if (r < 0)
2278 return log_link_debug_errno(link, r, "Failed to read IFLA_ADDRESS attribute: %m");
2279
2280 link->ethtool_permanent_hw_addr_read = true;
2281
2282 r = ethtool_get_permanent_hw_addr(&link->manager->ethtool_fd, link->ifname, &link->permanent_hw_addr);
2283 if (r < 0)
2284 log_link_debug_errno(link, r, "Permanent hardware address not found, continuing without: %m");
2285
2286 return 0;
2287 }
2288
2289 static int link_update_permanent_hardware_address(Link *link, sd_netlink_message *message) {
2290 int r;
2291
2292 assert(link);
2293 assert(link->manager);
2294 assert(message);
2295
2296 if (link->permanent_hw_addr.length > 0)
2297 return 0;
2298
2299 r = netlink_message_read_hw_addr(message, IFLA_PERM_ADDRESS, &link->permanent_hw_addr);
2300 if (r < 0) {
2301 if (r != -ENODATA)
2302 return log_link_debug_errno(link, r, "Failed to read IFLA_PERM_ADDRESS attribute: %m");
2303
2304 /* Fallback to ethtool for older kernels. */
2305 r = link_update_permanent_hardware_address_from_ethtool(link, message);
2306 if (r < 0)
2307 return r;
2308 }
2309
2310 if (link->permanent_hw_addr.length > 0)
2311 log_link_debug(link, "Saved permanent hardware address: %s", HW_ADDR_TO_STR(&link->permanent_hw_addr));
2312
2313 return 1; /* needs reconfigure */
2314 }
2315
2316 static int link_update_hardware_address(Link *link, sd_netlink_message *message) {
2317 struct hw_addr_data addr;
2318 int r;
2319
2320 assert(link);
2321 assert(message);
2322
2323 r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr);
2324 if (r < 0 && r != -ENODATA)
2325 return log_link_debug_errno(link, r, "rtnl: failed to read broadcast address: %m");
2326
2327 r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &addr);
2328 if (r == -ENODATA)
2329 return 0;
2330 if (r < 0)
2331 return log_link_debug_errno(link, r, "rtnl: failed to read hardware address: %m");
2332
2333 if (hw_addr_equal(&link->hw_addr, &addr))
2334 return 0;
2335
2336 if (link->hw_addr.length == 0)
2337 log_link_debug(link, "Saved hardware address: %s", HW_ADDR_TO_STR(&addr));
2338 else {
2339 log_link_debug(link, "Hardware address is changed: %s %s %s",
2340 HW_ADDR_TO_STR(&link->hw_addr),
2341 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT),
2342 HW_ADDR_TO_STR(&addr));
2343
2344 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
2345 }
2346
2347 link->hw_addr = addr;
2348
2349 if (!hw_addr_is_null(&link->hw_addr)) {
2350 r = hashmap_ensure_put(&link->manager->links_by_hw_addr, &hw_addr_hash_ops, &link->hw_addr, link);
2351 if (r == -EEXIST && streq_ptr(link->kind, "bond"))
2352 /* bonding master and its slaves have the same hardware address. */
2353 r = hashmap_replace(link->manager->links_by_hw_addr, &link->hw_addr, link);
2354 if (r < 0)
2355 log_link_debug_errno(link, r, "Failed to manage link by its new hardware address, ignoring: %m");
2356 }
2357
2358 r = ipv4acd_update_mac(link);
2359 if (r < 0)
2360 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m");
2361
2362 r = ipv4ll_update_mac(link);
2363 if (r < 0)
2364 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
2365
2366 r = dhcp4_update_mac(link);
2367 if (r < 0)
2368 return log_link_debug_errno(link, r, "Could not update MAC address in DHCP client: %m");
2369
2370 r = dhcp6_update_mac(link);
2371 if (r < 0)
2372 return log_link_debug_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
2373
2374 r = radv_update_mac(link);
2375 if (r < 0)
2376 return log_link_debug_errno(link, r, "Could not update MAC address for Router Advertisement: %m");
2377
2378 if (link->ndisc && link->hw_addr.length == ETH_ALEN) {
2379 r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether);
2380 if (r < 0)
2381 return log_link_debug_errno(link, r, "Could not update MAC for NDisc: %m");
2382 }
2383
2384 if (link->lldp_rx) {
2385 r = sd_lldp_rx_set_filter_address(link->lldp_rx, &link->hw_addr.ether);
2386 if (r < 0)
2387 return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Rx: %m");
2388 }
2389
2390 if (link->lldp_tx) {
2391 r = sd_lldp_tx_set_hwaddr(link->lldp_tx, &link->hw_addr.ether);
2392 if (r < 0)
2393 return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Tx: %m");
2394 }
2395
2396 return 1; /* needs reconfigure */
2397 }
2398
2399 static int link_update_mtu(Link *link, sd_netlink_message *message) {
2400 uint32_t mtu, min_mtu = 0, max_mtu = UINT32_MAX;
2401 int r;
2402
2403 assert(link);
2404 assert(message);
2405
2406 r = sd_netlink_message_read_u32(message, IFLA_MTU, &mtu);
2407 if (r == -ENODATA)
2408 return 0;
2409 if (r < 0)
2410 return log_link_debug_errno(link, r, "rtnl: failed to read MTU in RTM_NEWLINK message: %m");
2411 if (mtu == 0)
2412 return 0;
2413
2414 r = sd_netlink_message_read_u32(message, IFLA_MIN_MTU, &min_mtu);
2415 if (r < 0 && r != -ENODATA)
2416 return log_link_debug_errno(link, r, "rtnl: failed to read minimum MTU in RTM_NEWLINK message: %m");
2417
2418 r = sd_netlink_message_read_u32(message, IFLA_MAX_MTU, &max_mtu);
2419 if (r < 0 && r != -ENODATA)
2420 return log_link_debug_errno(link, r, "rtnl: failed to read maximum MTU in RTM_NEWLINK message: %m");
2421
2422 if (max_mtu == 0)
2423 max_mtu = UINT32_MAX;
2424
2425 link->min_mtu = min_mtu;
2426 link->max_mtu = max_mtu;
2427
2428 if (link->original_mtu == 0) {
2429 link->original_mtu = mtu;
2430 log_link_debug(link, "Saved original MTU %" PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2431 link->original_mtu, link->min_mtu, link->max_mtu);
2432 }
2433
2434 if (link->mtu == mtu)
2435 return 0;
2436
2437 if (link->mtu != 0)
2438 log_link_debug(link, "MTU is changed: %"PRIu32" %s %"PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2439 link->mtu, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), mtu,
2440 link->min_mtu, link->max_mtu);
2441
2442 link->mtu = mtu;
2443
2444 if (link->dhcp_client) {
2445 r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
2446 if (r < 0)
2447 return log_link_debug_errno(link, r, "Could not update MTU in DHCP client: %m");
2448 }
2449
2450 if (link->radv) {
2451 r = sd_radv_set_mtu(link->radv, link->mtu);
2452 if (r < 0)
2453 return log_link_debug_errno(link, r, "Could not set MTU for Router Advertisement: %m");
2454 }
2455
2456 return 0;
2457 }
2458
2459 static int link_update_alternative_names(Link *link, sd_netlink_message *message) {
2460 _cleanup_strv_free_ char **altnames = NULL;
2461 int r;
2462
2463 assert(link);
2464 assert(message);
2465
2466 r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &altnames);
2467 if (r == -ENODATA)
2468 /* The message does not have IFLA_PROP_LIST container attribute. It does not mean the
2469 * interface has no alternative name. */
2470 return 0;
2471 if (r < 0)
2472 return log_link_debug_errno(link, r, "rtnl: failed to read alternative names: %m");
2473
2474 if (strv_equal(altnames, link->alternative_names))
2475 return 0;
2476
2477 STRV_FOREACH(n, link->alternative_names)
2478 hashmap_remove(link->manager->links_by_name, *n);
2479
2480 strv_free_and_replace(link->alternative_names, altnames);
2481
2482 STRV_FOREACH(n, link->alternative_names) {
2483 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, *n, link);
2484 if (r < 0)
2485 return log_link_debug_errno(link, r, "Failed to manage link by its new alternative names: %m");
2486 }
2487
2488 return 1; /* needs reconfigure */
2489 }
2490
2491 static int link_update_name(Link *link, sd_netlink_message *message) {
2492 char ifname_from_index[IF_NAMESIZE];
2493 const char *ifname;
2494 int r;
2495
2496 assert(link);
2497 assert(message);
2498
2499 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
2500 if (r == -ENODATA)
2501 /* Hmm?? But ok. */
2502 return 0;
2503 if (r < 0)
2504 return log_link_debug_errno(link, r, "Failed to read interface name in RTM_NEWLINK message: %m");
2505
2506 if (streq(ifname, link->ifname))
2507 return 0;
2508
2509 r = format_ifname(link->ifindex, ifname_from_index);
2510 if (r < 0)
2511 return log_link_debug_errno(link, r, "Could not get interface name for index %i.", link->ifindex);
2512
2513 if (!streq(ifname, ifname_from_index)) {
2514 log_link_debug(link, "New interface name '%s' received from the kernel does not correspond "
2515 "with the name currently configured on the actual interface '%s'. Ignoring.",
2516 ifname, ifname_from_index);
2517 return 0;
2518 }
2519
2520 log_link_info(link, "Interface name change detected, renamed to %s.", ifname);
2521
2522 hashmap_remove(link->manager->links_by_name, link->ifname);
2523
2524 r = free_and_strdup(&link->ifname, ifname);
2525 if (r < 0)
2526 return log_oom_debug();
2527
2528 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, link->ifname, link);
2529 if (r < 0)
2530 return log_link_debug_errno(link, r, "Failed to manage link by its new name: %m");
2531
2532 if (link->dhcp_client) {
2533 r = sd_dhcp_client_set_ifname(link->dhcp_client, link->ifname);
2534 if (r < 0)
2535 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP client: %m");
2536 }
2537
2538 if (link->dhcp6_client) {
2539 r = sd_dhcp6_client_set_ifname(link->dhcp6_client, link->ifname);
2540 if (r < 0)
2541 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP6 client: %m");
2542 }
2543
2544 if (link->ndisc) {
2545 r = sd_ndisc_set_ifname(link->ndisc, link->ifname);
2546 if (r < 0)
2547 return log_link_debug_errno(link, r, "Failed to update interface name in NDisc: %m");
2548 }
2549
2550 if (link->dhcp_server) {
2551 r = sd_dhcp_server_set_ifname(link->dhcp_server, link->ifname);
2552 if (r < 0)
2553 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP server: %m");
2554 }
2555
2556 if (link->radv) {
2557 r = sd_radv_set_ifname(link->radv, link->ifname);
2558 if (r < 0)
2559 return log_link_debug_errno(link, r, "Failed to update interface name in Router Advertisement: %m");
2560 }
2561
2562 if (link->lldp_rx) {
2563 r = sd_lldp_rx_set_ifname(link->lldp_rx, link->ifname);
2564 if (r < 0)
2565 return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Rx: %m");
2566 }
2567
2568 if (link->lldp_tx) {
2569 r = sd_lldp_tx_set_ifname(link->lldp_tx, link->ifname);
2570 if (r < 0)
2571 return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Tx: %m");
2572 }
2573
2574 if (link->ipv4ll) {
2575 r = sd_ipv4ll_set_ifname(link->ipv4ll, link->ifname);
2576 if (r < 0)
2577 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4LL client: %m");
2578 }
2579
2580 r = ipv4acd_set_ifname(link);
2581 if (r < 0)
2582 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4ACD client: %m");
2583
2584 return 1; /* needs reconfigure */
2585 }
2586
2587 static int link_update(Link *link, sd_netlink_message *message) {
2588 bool needs_reconfigure = false;
2589 int r;
2590
2591 assert(link);
2592 assert(message);
2593
2594 r = link_update_name(link, message);
2595 if (r < 0)
2596 return r;
2597 needs_reconfigure = needs_reconfigure || r > 0;
2598
2599 r = link_update_alternative_names(link, message);
2600 if (r < 0)
2601 return r;
2602 needs_reconfigure = needs_reconfigure || r > 0;
2603
2604 r = link_update_mtu(link, message);
2605 if (r < 0)
2606 return r;
2607
2608 r = link_update_driver(link, message);
2609 if (r < 0)
2610 return r;
2611 needs_reconfigure = needs_reconfigure || r > 0;
2612
2613 r = link_update_permanent_hardware_address(link, message);
2614 if (r < 0)
2615 return r;
2616 needs_reconfigure = needs_reconfigure || r > 0;
2617
2618 r = link_update_hardware_address(link, message);
2619 if (r < 0)
2620 return r;
2621 needs_reconfigure = needs_reconfigure || r > 0;
2622
2623 r = link_update_master(link, message);
2624 if (r < 0)
2625 return r;
2626
2627 r = link_update_ipv6ll_addrgen_mode(link, message);
2628 if (r < 0)
2629 return r;
2630
2631 r = link_update_flags(link, message);
2632 if (r < 0)
2633 return r;
2634
2635 r = link_update_bridge_vlan(link, message);
2636 if (r < 0)
2637 return r;
2638
2639 return needs_reconfigure;
2640 }
2641
2642 static Link *link_drop_or_unref(Link *link) {
2643 if (!link)
2644 return NULL;
2645 if (!link->manager)
2646 return link_unref(link);
2647 return link_drop(link);
2648 }
2649
2650 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_drop_or_unref);
2651
2652 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
2653 _cleanup_free_ char *ifname = NULL, *kind = NULL, *state_file = NULL, *lease_file = NULL;
2654 _cleanup_(link_drop_or_unrefp) Link *link = NULL;
2655 unsigned short iftype;
2656 int r, ifindex;
2657
2658 assert(manager);
2659 assert(message);
2660 assert(ret);
2661
2662 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2663 if (r < 0)
2664 return log_debug_errno(r, "rtnl: failed to read ifindex from link message: %m");
2665 else if (ifindex <= 0)
2666 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "rtnl: received link message without valid ifindex.");
2667
2668 r = sd_rtnl_message_link_get_type(message, &iftype);
2669 if (r < 0)
2670 return log_debug_errno(r, "rtnl: failed to read interface type from link message: %m");
2671
2672 r = sd_netlink_message_read_string_strdup(message, IFLA_IFNAME, &ifname);
2673 if (r < 0)
2674 return log_debug_errno(r, "rtnl: failed to read interface name from link message: %m");
2675
2676 /* check for link kind */
2677 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
2678 if (r >= 0) {
2679 r = sd_netlink_message_read_string_strdup(message, IFLA_INFO_KIND, &kind);
2680 if (r < 0 && r != -ENODATA)
2681 return log_debug_errno(r, "rtnl: failed to read interface kind from link message: %m");
2682 r = sd_netlink_message_exit_container(message);
2683 if (r < 0)
2684 return log_debug_errno(r, "rtnl: failed to exit IFLA_LINKINFO container: %m");
2685 }
2686
2687 if (!manager->test_mode) {
2688 /* Do not update state files when running in test mode. */
2689 if (asprintf(&state_file, "/run/systemd/netif/links/%d", ifindex) < 0)
2690 return log_oom_debug();
2691
2692 if (asprintf(&lease_file, "/run/systemd/netif/leases/%d", ifindex) < 0)
2693 return log_oom_debug();
2694 }
2695
2696 link = new(Link, 1);
2697 if (!link)
2698 return -ENOMEM;
2699
2700 *link = (Link) {
2701 .n_ref = 1,
2702 .state = LINK_STATE_PENDING,
2703 .online_state = _LINK_ONLINE_STATE_INVALID,
2704 .automatic_reconfigure_ratelimit = (const RateLimit) { .interval = 10 * USEC_PER_SEC, .burst = 5 },
2705 .ifindex = ifindex,
2706 .iftype = iftype,
2707 .ifname = TAKE_PTR(ifname),
2708 .kind = TAKE_PTR(kind),
2709
2710 .bridge_vlan_pvid = UINT16_MAX,
2711
2712 .ipv6ll_address_gen_mode = _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_INVALID,
2713
2714 .state_file = TAKE_PTR(state_file),
2715 .lease_file = TAKE_PTR(lease_file),
2716
2717 .n_dns = UINT_MAX,
2718 .dns_default_route = -1,
2719 .llmnr = _RESOLVE_SUPPORT_INVALID,
2720 .mdns = _RESOLVE_SUPPORT_INVALID,
2721 .dnssec_mode = _DNSSEC_MODE_INVALID,
2722 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
2723 };
2724
2725 r = hashmap_ensure_put(&manager->links_by_index, NULL, INT_TO_PTR(link->ifindex), link);
2726 if (r < 0)
2727 return log_link_debug_errno(link, r, "Failed to store link into manager: %m");
2728
2729 link->manager = manager;
2730
2731 r = hashmap_ensure_put(&manager->links_by_name, &string_hash_ops, link->ifname, link);
2732 if (r < 0)
2733 return log_link_debug_errno(link, r, "Failed to manage link by its interface name: %m");
2734
2735 log_link_debug(link, "Saved new link: ifindex=%i, iftype=%s(%u), kind=%s",
2736 link->ifindex, strna(arphrd_to_name(link->iftype)), link->iftype, strna(link->kind));
2737
2738 /* If contained in this set, the link is wireless and the corresponding NL80211_CMD_NEW_INTERFACE
2739 * message arrived too early. Request the wireless link information again.
2740 */
2741 if (set_remove(manager->new_wlan_ifindices, INT_TO_PTR(link->ifindex))) {
2742 r = link_get_wlan_interface(link);
2743 if (r < 0)
2744 log_link_warning_errno(link, r, "Failed to get wireless interface, ignoring: %m");
2745 }
2746
2747 *ret = TAKE_PTR(link);
2748 return 0;
2749 }
2750
2751 int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, Manager *manager) {
2752 Link *link = NULL;
2753 NetDev *netdev = NULL;
2754 uint16_t type;
2755 const char *name;
2756 int r, ifindex;
2757
2758 assert(rtnl);
2759 assert(message);
2760 assert(manager);
2761
2762 if (sd_netlink_message_is_error(message)) {
2763 r = sd_netlink_message_get_errno(message);
2764 if (r < 0)
2765 log_message_warning_errno(message, r, "rtnl: Could not receive link message, ignoring");
2766
2767 return 0;
2768 }
2769
2770 r = sd_netlink_message_get_type(message, &type);
2771 if (r < 0) {
2772 log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
2773 return 0;
2774 } else if (!IN_SET(type, RTM_NEWLINK, RTM_DELLINK)) {
2775 log_warning("rtnl: Received unexpected message type %u when processing link, ignoring.", type);
2776 return 0;
2777 }
2778
2779 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2780 if (r < 0) {
2781 log_warning_errno(r, "rtnl: Could not get ifindex from link message, ignoring: %m");
2782 return 0;
2783 } else if (ifindex <= 0) {
2784 log_warning("rtnl: received link message with invalid ifindex %d, ignoring.", ifindex);
2785 return 0;
2786 }
2787
2788 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
2789 if (r < 0) {
2790 log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
2791 return 0;
2792 }
2793
2794 (void) link_get_by_index(manager, ifindex, &link);
2795 (void) netdev_get(manager, name, &netdev);
2796
2797 switch (type) {
2798 case RTM_NEWLINK:
2799 if (netdev) {
2800 /* netdev exists, so make sure the ifindex matches */
2801 r = netdev_set_ifindex(netdev, message);
2802 if (r < 0) {
2803 log_netdev_warning_errno(netdev, r, "Could not process new link message for netdev, ignoring: %m");
2804 return 0;
2805 }
2806 }
2807
2808 if (!link) {
2809 /* link is new, so add it */
2810 r = link_new(manager, message, &link);
2811 if (r < 0) {
2812 log_warning_errno(r, "Could not process new link message: %m");
2813 return 0;
2814 }
2815
2816 r = link_update(link, message);
2817 if (r < 0) {
2818 log_link_warning_errno(link, r, "Could not process link message: %m");
2819 link_enter_failed(link);
2820 return 0;
2821 }
2822
2823 r = link_check_initialized(link);
2824 if (r < 0) {
2825 log_link_warning_errno(link, r, "Failed to check link is initialized: %m");
2826 link_enter_failed(link);
2827 return 0;
2828 }
2829 } else {
2830 r = link_update(link, message);
2831 if (r < 0) {
2832 log_link_warning_errno(link, r, "Could not process link message: %m");
2833 link_enter_failed(link);
2834 return 0;
2835 }
2836 if (r > 0) {
2837 r = link_reconfigure_impl(link, /* force = */ false);
2838 if (r < 0) {
2839 log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
2840 link_enter_failed(link);
2841 return 0;
2842 }
2843 }
2844 }
2845 break;
2846
2847 case RTM_DELLINK:
2848 link_drop(link);
2849 netdev_drop(netdev);
2850 break;
2851
2852 default:
2853 assert_not_reached();
2854 }
2855
2856 return 1;
2857 }
2858
2859 int link_getlink_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, const char *error_msg) {
2860 uint16_t message_type;
2861 int r;
2862
2863 assert(m);
2864 assert(link);
2865 assert(error_msg);
2866
2867 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2868 return 0;
2869
2870 r = sd_netlink_message_get_errno(m);
2871 if (r < 0) {
2872 log_link_message_warning_errno(link, m, r, error_msg);
2873 link_enter_failed(link);
2874 return 0;
2875 }
2876
2877 r = sd_netlink_message_get_type(m, &message_type);
2878 if (r < 0) {
2879 log_link_debug_errno(link, r, "rtnl: failed to read link message type, ignoring: %m");
2880 return 0;
2881 }
2882 if (message_type != RTM_NEWLINK) {
2883 log_link_debug(link, "rtnl: received invalid link message type, ignoring.");
2884 return 0;
2885 }
2886
2887 r = link_update(link, m);
2888 if (r < 0) {
2889 link_enter_failed(link);
2890 return 0;
2891 }
2892
2893 return 1;
2894 }
2895
2896 int link_call_getlink(Link *link, link_netlink_message_handler_t callback) {
2897 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2898 int r;
2899
2900 assert(link);
2901 assert(link->manager);
2902 assert(link->manager->rtnl);
2903 assert(callback);
2904
2905 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
2906 if (r < 0)
2907 return r;
2908
2909 r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
2910 link_netlink_destroy_callback, link);
2911 if (r < 0)
2912 return r;
2913
2914 link_ref(link);
2915 return 0;
2916 }
2917
2918 static const char* const link_state_table[_LINK_STATE_MAX] = {
2919 [LINK_STATE_PENDING] = "pending",
2920 [LINK_STATE_INITIALIZED] = "initialized",
2921 [LINK_STATE_CONFIGURING] = "configuring",
2922 [LINK_STATE_CONFIGURED] = "configured",
2923 [LINK_STATE_UNMANAGED] = "unmanaged",
2924 [LINK_STATE_FAILED] = "failed",
2925 [LINK_STATE_LINGER] = "linger",
2926 };
2927
2928 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
2929
2930 int link_flags_to_string_alloc(uint32_t flags, char **ret) {
2931 _cleanup_free_ char *str = NULL;
2932 static const char* map[] = {
2933 [LOG2U(IFF_UP)] = "up", /* interface is up. */
2934 [LOG2U(IFF_BROADCAST)] = "broadcast", /* broadcast address valid. */
2935 [LOG2U(IFF_DEBUG)] = "debug", /* turn on debugging. */
2936 [LOG2U(IFF_LOOPBACK)] = "loopback", /* interface is a loopback net. */
2937 [LOG2U(IFF_POINTOPOINT)] = "point-to-point", /* interface has p-p link. */
2938 [LOG2U(IFF_NOTRAILERS)] = "no-trailers", /* avoid use of trailers. */
2939 [LOG2U(IFF_RUNNING)] = "running", /* interface RFC2863 OPER_UP. */
2940 [LOG2U(IFF_NOARP)] = "no-arp", /* no ARP protocol. */
2941 [LOG2U(IFF_PROMISC)] = "promiscuous", /* receive all packets. */
2942 [LOG2U(IFF_ALLMULTI)] = "all-multicast", /* receive all multicast packets. */
2943 [LOG2U(IFF_MASTER)] = "master", /* master of a load balancer. */
2944 [LOG2U(IFF_SLAVE)] = "slave", /* slave of a load balancer. */
2945 [LOG2U(IFF_MULTICAST)] = "multicast", /* supports multicast. */
2946 [LOG2U(IFF_PORTSEL)] = "portsel", /* can set media type. */
2947 [LOG2U(IFF_AUTOMEDIA)] = "auto-media", /* auto media select active. */
2948 [LOG2U(IFF_DYNAMIC)] = "dynamic", /* dialup device with changing addresses. */
2949 [LOG2U(IFF_LOWER_UP)] = "lower-up", /* driver signals L1 up. */
2950 [LOG2U(IFF_DORMANT)] = "dormant", /* driver signals dormant. */
2951 [LOG2U(IFF_ECHO)] = "echo", /* echo sent packets. */
2952 };
2953
2954 assert(ret);
2955
2956 for (size_t i = 0; i < ELEMENTSOF(map); i++)
2957 if (FLAGS_SET(flags, 1 << i) && map[i])
2958 if (!strextend_with_separator(&str, ",", map[i]))
2959 return -ENOMEM;
2960
2961 *ret = TAKE_PTR(str);
2962 return 0;
2963 }
2964
2965 static const char * const kernel_operstate_table[] = {
2966 [IF_OPER_UNKNOWN] = "unknown",
2967 [IF_OPER_NOTPRESENT] = "not-present",
2968 [IF_OPER_DOWN] = "down",
2969 [IF_OPER_LOWERLAYERDOWN] = "lower-layer-down",
2970 [IF_OPER_TESTING] = "testing",
2971 [IF_OPER_DORMANT] = "dormant",
2972 [IF_OPER_UP] = "up",
2973 };
2974
2975 DEFINE_STRING_TABLE_LOOKUP_TO_STRING(kernel_operstate, int);
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