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[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-identifier.h"
21 #include "dhcp-lease-internal.h"
22 #include "env-file.h"
23 #include "ethtool-util.h"
24 #include "event-util.h"
25 #include "fd-util.h"
26 #include "fileio.h"
27 #include "format-util.h"
28 #include "fs-util.h"
29 #include "glyph-util.h"
30 #include "logarithm.h"
31 #include "missing_network.h"
32 #include "netlink-util.h"
33 #include "network-internal.h"
34 #include "networkd-address-label.h"
35 #include "networkd-address.h"
36 #include "networkd-bridge-fdb.h"
37 #include "networkd-bridge-mdb.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.h"
56 #include "networkd-routing-policy-rule.h"
57 #include "networkd-setlink.h"
58 #include "networkd-sriov.h"
59 #include "networkd-state-file.h"
60 #include "networkd-sysctl.h"
61 #include "networkd-wifi.h"
62 #include "set.h"
63 #include "socket-util.h"
64 #include "stdio-util.h"
65 #include "string-table.h"
66 #include "strv.h"
67 #include "tc.h"
68 #include "tmpfile-util.h"
69 #include "tuntap.h"
70 #include "udev-util.h"
71 #include "vrf.h"
72
73 bool link_ipv6_enabled(Link *link) {
74 assert(link);
75
76 if (!socket_ipv6_is_supported())
77 return false;
78
79 if (link->iftype == ARPHRD_CAN)
80 return false;
81
82 if (!link->network)
83 return false;
84
85 if (link->network->bond)
86 return false;
87
88 if (link_may_have_ipv6ll(link, /* check_multicast = */ false))
89 return true;
90
91 if (network_has_static_ipv6_configurations(link->network))
92 return true;
93
94 return false;
95 }
96
97 static bool link_is_ready_to_configure_one(Link *link, bool allow_unmanaged) {
98 assert(link);
99
100 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED, LINK_STATE_UNMANAGED))
101 return false;
102
103 if (!link->network)
104 return allow_unmanaged;
105
106 if (!link->network->configure_without_carrier) {
107 if (link->set_flags_messages > 0)
108 return false;
109
110 if (!link_has_carrier(link))
111 return false;
112 }
113
114 if (link->set_link_messages > 0)
115 return false;
116
117 if (!link->activated)
118 return false;
119
120 return true;
121 }
122
123 bool link_is_ready_to_configure(Link *link, bool allow_unmanaged) {
124 return check_ready_for_all_sr_iov_ports(link, allow_unmanaged, link_is_ready_to_configure_one);
125 }
126
127 void link_ntp_settings_clear(Link *link) {
128 link->ntp = strv_free(link->ntp);
129 }
130
131 void link_dns_settings_clear(Link *link) {
132 if (link->n_dns != UINT_MAX)
133 for (unsigned i = 0; i < link->n_dns; i++)
134 in_addr_full_free(link->dns[i]);
135 link->dns = mfree(link->dns);
136 link->n_dns = UINT_MAX;
137
138 link->search_domains = ordered_set_free(link->search_domains);
139 link->route_domains = ordered_set_free(link->route_domains);
140
141 link->dns_default_route = -1;
142 link->llmnr = _RESOLVE_SUPPORT_INVALID;
143 link->mdns = _RESOLVE_SUPPORT_INVALID;
144 link->dnssec_mode = _DNSSEC_MODE_INVALID;
145 link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
146
147 link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
148 }
149
150 static void link_free_engines(Link *link) {
151 if (!link)
152 return;
153
154 link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
155
156 link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client);
157 link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
158 link->dhcp4_6rd_tunnel_name = mfree(link->dhcp4_6rd_tunnel_name);
159
160 link->lldp_rx = sd_lldp_rx_unref(link->lldp_rx);
161 link->lldp_tx = sd_lldp_tx_unref(link->lldp_tx);
162
163 link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
164
165 link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
166 link->dhcp6_lease = sd_dhcp6_lease_unref(link->dhcp6_lease);
167
168 link->ndisc = sd_ndisc_unref(link->ndisc);
169 link->ndisc_expire = sd_event_source_disable_unref(link->ndisc_expire);
170 ndisc_flush(link);
171
172 link->radv = sd_radv_unref(link->radv);
173 }
174
175 static Link *link_free(Link *link) {
176 assert(link);
177
178 link_ntp_settings_clear(link);
179 link_dns_settings_clear(link);
180
181 link->routes = set_free(link->routes);
182 link->nexthops = set_free(link->nexthops);
183 link->neighbors = set_free(link->neighbors);
184 link->addresses = set_free(link->addresses);
185 link->qdiscs = set_free(link->qdiscs);
186 link->tclasses = set_free(link->tclasses);
187
188 link->dhcp_pd_prefixes = set_free(link->dhcp_pd_prefixes);
189
190 link_free_engines(link);
191
192 set_free(link->sr_iov_virt_port_ifindices);
193 free(link->ifname);
194 strv_free(link->alternative_names);
195 free(link->kind);
196 free(link->ssid);
197 free(link->previous_ssid);
198 free(link->driver);
199
200 unlink_and_free(link->lease_file);
201 unlink_and_free(link->lldp_file);
202 unlink_and_free(link->state_file);
203
204 sd_device_unref(link->dev);
205 netdev_unref(link->netdev);
206
207 hashmap_free(link->bound_to_links);
208 hashmap_free(link->bound_by_links);
209
210 set_free_with_destructor(link->slaves, link_unref);
211
212 network_unref(link->network);
213
214 sd_event_source_disable_unref(link->carrier_lost_timer);
215
216 return mfree(link);
217 }
218
219 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
220
221 int link_get_by_index(Manager *m, int ifindex, Link **ret) {
222 Link *link;
223
224 assert(m);
225 assert(ifindex > 0);
226
227 link = hashmap_get(m->links_by_index, INT_TO_PTR(ifindex));
228 if (!link)
229 return -ENODEV;
230
231 if (ret)
232 *ret = link;
233 return 0;
234 }
235
236 int link_get_by_name(Manager *m, const char *ifname, Link **ret) {
237 Link *link;
238
239 assert(m);
240 assert(ifname);
241
242 link = hashmap_get(m->links_by_name, ifname);
243 if (!link)
244 return -ENODEV;
245
246 if (ret)
247 *ret = link;
248 return 0;
249 }
250
251 int link_get_by_hw_addr(Manager *m, const struct hw_addr_data *hw_addr, Link **ret) {
252 Link *link;
253
254 assert(m);
255 assert(hw_addr);
256
257 link = hashmap_get(m->links_by_hw_addr, hw_addr);
258 if (!link)
259 return -ENODEV;
260
261 if (ret)
262 *ret = link;
263 return 0;
264 }
265
266 int link_get_master(Link *link, Link **ret) {
267 assert(link);
268 assert(link->manager);
269 assert(ret);
270
271 if (link->master_ifindex <= 0 || link->master_ifindex == link->ifindex)
272 return -ENODEV;
273
274 return link_get_by_index(link->manager, link->master_ifindex, ret);
275 }
276
277 void link_set_state(Link *link, LinkState state) {
278 assert(link);
279
280 if (link->state == state)
281 return;
282
283 log_link_debug(link, "State changed: %s -> %s",
284 link_state_to_string(link->state),
285 link_state_to_string(state));
286
287 link->state = state;
288
289 link_send_changed(link, "AdministrativeState", NULL);
290 link_dirty(link);
291 }
292
293 int link_stop_engines(Link *link, bool may_keep_dhcp) {
294 int r = 0, k;
295
296 assert(link);
297 assert(link->manager);
298 assert(link->manager->event);
299
300 bool keep_dhcp = may_keep_dhcp &&
301 link->network &&
302 !link->network->dhcp_send_decline && /* IPv4 ACD for the DHCPv4 address is running. */
303 (link->manager->restarting ||
304 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
305
306 if (!keep_dhcp) {
307 k = sd_dhcp_client_stop(link->dhcp_client);
308 if (k < 0)
309 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
310 }
311
312 k = sd_dhcp_server_stop(link->dhcp_server);
313 if (k < 0)
314 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 server: %m");
315
316 k = sd_lldp_rx_stop(link->lldp_rx);
317 if (k < 0)
318 r = log_link_warning_errno(link, k, "Could not stop LLDP Rx: %m");
319
320 k = sd_lldp_tx_stop(link->lldp_tx);
321 if (k < 0)
322 r = log_link_warning_errno(link, k, "Could not stop LLDP Tx: %m");
323
324 k = sd_ipv4ll_stop(link->ipv4ll);
325 if (k < 0)
326 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
327
328 k = ipv4acd_stop(link);
329 if (k < 0)
330 r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client: %m");
331
332 k = sd_dhcp6_client_stop(link->dhcp6_client);
333 if (k < 0)
334 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
335
336 k = dhcp_pd_remove(link, /* only_marked = */ false);
337 if (k < 0)
338 r = log_link_warning_errno(link, k, "Could not remove DHCPv6 PD addresses and routes: %m");
339
340 k = ndisc_stop(link);
341 if (k < 0)
342 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
343
344 ndisc_flush(link);
345
346 k = sd_radv_stop(link->radv);
347 if (k < 0)
348 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
349
350 return r;
351 }
352
353 void link_enter_failed(Link *link) {
354 assert(link);
355
356 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
357 return;
358
359 log_link_warning(link, "Failed");
360
361 link_set_state(link, LINK_STATE_FAILED);
362
363 (void) link_stop_engines(link, false);
364 }
365
366 void link_check_ready(Link *link) {
367 Address *a;
368
369 assert(link);
370
371 if (link->state == LINK_STATE_CONFIGURED)
372 return;
373
374 if (link->state != LINK_STATE_CONFIGURING)
375 return (void) log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state));
376
377 if (!link->network)
378 return (void) log_link_debug(link, "%s(): link is unmanaged.", __func__);
379
380 if (!link->tc_configured)
381 return (void) log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
382
383 if (link->set_link_messages > 0)
384 return (void) log_link_debug(link, "%s(): link layer is configuring.", __func__);
385
386 if (!link->activated)
387 return (void) log_link_debug(link, "%s(): link is not activated.", __func__);
388
389 if (link->iftype == ARPHRD_CAN) {
390 /* let's shortcut things for CAN which doesn't need most of checks below. */
391 link_set_state(link, LINK_STATE_CONFIGURED);
392 return;
393 }
394
395 if (!link->stacked_netdevs_created)
396 return (void) log_link_debug(link, "%s(): stacked netdevs are not created.", __func__);
397
398 if (!link->static_addresses_configured)
399 return (void) log_link_debug(link, "%s(): static addresses are not configured.", __func__);
400
401 if (!link->static_address_labels_configured)
402 return (void) log_link_debug(link, "%s(): static address labels are not configured.", __func__);
403
404 if (!link->static_bridge_fdb_configured)
405 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
406
407 if (!link->static_bridge_mdb_configured)
408 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
409
410 if (!link->static_ipv6_proxy_ndp_configured)
411 return (void) log_link_debug(link, "%s(): static IPv6 proxy NDP addresses are not configured.", __func__);
412
413 if (!link->static_neighbors_configured)
414 return (void) log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
415
416 if (!link->static_nexthops_configured)
417 return (void) log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
418
419 if (!link->static_routes_configured)
420 return (void) log_link_debug(link, "%s(): static routes are not configured.", __func__);
421
422 if (!link->static_routing_policy_rules_configured)
423 return (void) log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
424
425 if (!link->sr_iov_configured)
426 return (void) log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
427
428 /* IPv6LL is assigned after the link gains its carrier. */
429 if (!link->network->configure_without_carrier &&
430 link_ipv6ll_enabled(link) &&
431 !in6_addr_is_set(&link->ipv6ll_address))
432 return (void) log_link_debug(link, "%s(): IPv6LL is not configured yet.", __func__);
433
434 /* All static addresses must be ready. */
435 bool has_static_address = false;
436 SET_FOREACH(a, link->addresses) {
437 if (a->source != NETWORK_CONFIG_SOURCE_STATIC)
438 continue;
439 if (!address_is_ready(a))
440 return (void) log_link_debug(link, "%s(): static address %s is not ready.", __func__,
441 IN_ADDR_PREFIX_TO_STRING(a->family, &a->in_addr, a->prefixlen));
442 has_static_address = true;
443 }
444
445 /* If at least one static address is requested, do not request that dynamic addressing protocols are finished. */
446 if (has_static_address)
447 goto ready;
448
449 /* If no dynamic addressing protocol enabled, assume the interface is ready.
450 * Note, ignore NDisc when ConfigureWithoutCarrier= is enabled, as IPv6AcceptRA= is enabled by default. */
451 if (!link_ipv4ll_enabled(link) && !link_dhcp4_enabled(link) &&
452 !link_dhcp6_enabled(link) && !link_dhcp_pd_is_enabled(link) &&
453 (link->network->configure_without_carrier || !link_ipv6_accept_ra_enabled(link)))
454 goto ready;
455
456 bool ipv4ll_ready =
457 link_ipv4ll_enabled(link) && link->ipv4ll_address_configured &&
458 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_IPV4LL);
459 bool dhcp4_ready =
460 link_dhcp4_enabled(link) && link->dhcp4_configured &&
461 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP4);
462 bool dhcp6_ready =
463 link_dhcp6_enabled(link) && link->dhcp6_configured &&
464 (!link->network->dhcp6_use_address ||
465 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP6));
466 bool dhcp_pd_ready =
467 link_dhcp_pd_is_enabled(link) && link->dhcp_pd_configured &&
468 (!link->network->dhcp_pd_assign ||
469 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP_PD));
470 bool ndisc_ready =
471 link_ipv6_accept_ra_enabled(link) && link->ndisc_configured &&
472 (!link->network->ipv6_accept_ra_use_autonomous_prefix ||
473 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_NDISC));
474
475 /* If the uplink for PD is self, then request the corresponding DHCP protocol is also ready. */
476 if (dhcp_pd_is_uplink(link, link, /* accept_auto = */ false)) {
477 if (link_dhcp4_enabled(link) && link->network->dhcp_use_6rd &&
478 link->dhcp_lease && dhcp4_lease_has_pd_prefix(link->dhcp_lease)) {
479 if (!dhcp4_ready)
480 return (void) log_link_debug(link, "%s(): DHCPv4 6rd prefix is assigned, but DHCPv4 protocol is not finished yet.", __func__);
481 if (!dhcp_pd_ready)
482 return (void) log_link_debug(link, "%s(): DHCPv4 is finished, but prefix acquired by DHCPv4-6rd is not assigned yet.", __func__);
483 }
484
485 if (link_dhcp6_enabled(link) && link->network->dhcp6_use_pd_prefix &&
486 link->dhcp6_lease && dhcp6_lease_has_pd_prefix(link->dhcp6_lease)) {
487 if (!dhcp6_ready)
488 return (void) log_link_debug(link, "%s(): DHCPv6 IA_PD prefix is assigned, but DHCPv6 protocol is not finished yet.", __func__);
489 if (!dhcp_pd_ready)
490 return (void) log_link_debug(link, "%s(): DHCPv6 is finished, but prefix acquired by DHCPv6 IA_PD is not assigned yet.", __func__);
491 }
492 }
493
494 /* At least one dynamic addressing protocol is finished. */
495 if (!ipv4ll_ready && !dhcp4_ready && !dhcp6_ready && !dhcp_pd_ready && !ndisc_ready)
496 return (void) log_link_debug(link, "%s(): dynamic addressing protocols are enabled but none of them finished yet.", __func__);
497
498 log_link_debug(link, "%s(): IPv4LL:%s DHCPv4:%s DHCPv6:%s DHCP-PD:%s NDisc:%s",
499 __func__,
500 yes_no(ipv4ll_ready),
501 yes_no(dhcp4_ready),
502 yes_no(dhcp6_ready),
503 yes_no(dhcp_pd_ready),
504 yes_no(ndisc_ready));
505
506 ready:
507 link_set_state(link, LINK_STATE_CONFIGURED);
508 }
509
510 static int link_request_static_configs(Link *link) {
511 int r;
512
513 assert(link);
514 assert(link->network);
515 assert(link->state != _LINK_STATE_INVALID);
516
517 r = link_request_static_addresses(link);
518 if (r < 0)
519 return r;
520
521 r = link_request_static_address_labels(link);
522 if (r < 0)
523 return r;
524
525 r = link_request_static_bridge_fdb(link);
526 if (r < 0)
527 return r;
528
529 r = link_request_static_bridge_mdb(link);
530 if (r < 0)
531 return r;
532
533 r = link_request_static_ipv6_proxy_ndp_addresses(link);
534 if (r < 0)
535 return r;
536
537 r = link_request_static_neighbors(link);
538 if (r < 0)
539 return r;
540
541 r = link_request_static_nexthops(link, false);
542 if (r < 0)
543 return r;
544
545 r = link_request_static_routes(link, false);
546 if (r < 0)
547 return r;
548
549 r = link_request_static_routing_policy_rules(link);
550 if (r < 0)
551 return r;
552
553 return 0;
554 }
555
556 static int link_request_stacked_netdevs(Link *link) {
557 NetDev *netdev;
558 int r;
559
560 assert(link);
561
562 link->stacked_netdevs_created = false;
563
564 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) {
565 r = link_request_stacked_netdev(link, netdev);
566 if (r < 0)
567 return r;
568 }
569
570 if (link->create_stacked_netdev_messages == 0) {
571 link->stacked_netdevs_created = true;
572 link_check_ready(link);
573 }
574
575 return 0;
576 }
577
578 static int link_acquire_dynamic_ipv6_conf(Link *link) {
579 int r;
580
581 assert(link);
582
583 r = radv_start(link);
584 if (r < 0)
585 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Advertisement engine: %m");
586
587 r = ndisc_start(link);
588 if (r < 0)
589 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Discovery: %m");
590
591 r = dhcp6_start(link);
592 if (r < 0)
593 return log_link_warning_errno(link, r, "Failed to start DHCPv6 client: %m");
594
595 return 0;
596 }
597
598 static int link_acquire_dynamic_ipv4_conf(Link *link) {
599 int r;
600
601 assert(link);
602 assert(link->manager);
603 assert(link->manager->event);
604
605 if (link->dhcp_client) {
606 r = dhcp4_start(link);
607 if (r < 0)
608 return log_link_warning_errno(link, r, "Failed to start DHCPv4 client: %m");
609
610 log_link_debug(link, "Acquiring DHCPv4 lease.");
611
612 } else if (link->ipv4ll) {
613 if (in4_addr_is_set(&link->network->ipv4ll_start_address)) {
614 r = sd_ipv4ll_set_address(link->ipv4ll, &link->network->ipv4ll_start_address);
615 if (r < 0)
616 return log_link_warning_errno(link, r, "Could not set IPv4 link-local start address: %m");
617 }
618
619 r = sd_ipv4ll_start(link->ipv4ll);
620 if (r < 0)
621 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
622
623 log_link_debug(link, "Acquiring IPv4 link-local address.");
624 }
625
626 if (link->dhcp_server) {
627 r = sd_dhcp_server_start(link->dhcp_server);
628 if (r < 0)
629 return log_link_warning_errno(link, r, "Could not start DHCP server: %m");
630 }
631
632 r = ipv4acd_start(link);
633 if (r < 0)
634 return log_link_warning_errno(link, r, "Could not start IPv4 ACD client: %m");
635
636 return 0;
637 }
638
639 static int link_acquire_dynamic_conf(Link *link) {
640 int r;
641
642 assert(link);
643 assert(link->network);
644
645 r = link_acquire_dynamic_ipv4_conf(link);
646 if (r < 0)
647 return r;
648
649 if (in6_addr_is_set(&link->ipv6ll_address)) {
650 r = link_acquire_dynamic_ipv6_conf(link);
651 if (r < 0)
652 return r;
653 }
654
655 if (!link_radv_enabled(link) || !link->network->dhcp_pd_announce) {
656 /* DHCPv6PD downstream does not require IPv6LL address. But may require RADV to be
657 * configured, and RADV may not be configured yet here. Only acquire subnet prefix when
658 * RADV is disabled, or the announcement of the prefix is disabled. Otherwise, the
659 * below will be called in radv_start(). */
660 r = dhcp_request_prefix_delegation(link);
661 if (r < 0)
662 return log_link_warning_errno(link, r, "Failed to request DHCP delegated subnet prefix: %m");
663 }
664
665 if (link->lldp_tx) {
666 r = sd_lldp_tx_start(link->lldp_tx);
667 if (r < 0)
668 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
669 }
670
671 if (link->lldp_rx) {
672 r = sd_lldp_rx_start(link->lldp_rx);
673 if (r < 0)
674 return log_link_warning_errno(link, r, "Failed to start LLDP client: %m");
675 }
676
677 return 0;
678 }
679
680 int link_ipv6ll_gained(Link *link) {
681 int r;
682
683 assert(link);
684
685 log_link_info(link, "Gained IPv6LL");
686
687 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
688 return 0;
689
690 r = link_acquire_dynamic_ipv6_conf(link);
691 if (r < 0)
692 return r;
693
694 link_check_ready(link);
695 return 0;
696 }
697
698 int link_handle_bound_to_list(Link *link) {
699 bool required_up = false;
700 bool link_is_up = false;
701 Link *l;
702
703 assert(link);
704
705 /* If at least one interface in bound_to_links has carrier, then make this interface up.
706 * If all interfaces in bound_to_links do not, then make this interface down. */
707
708 if (hashmap_isempty(link->bound_to_links))
709 return 0;
710
711 if (link->flags & IFF_UP)
712 link_is_up = true;
713
714 HASHMAP_FOREACH(l, link->bound_to_links)
715 if (link_has_carrier(l)) {
716 required_up = true;
717 break;
718 }
719
720 if (!required_up && link_is_up)
721 return link_request_to_bring_up_or_down(link, /* up = */ false);
722 if (required_up && !link_is_up)
723 return link_request_to_bring_up_or_down(link, /* up = */ true);
724
725 return 0;
726 }
727
728 static int link_handle_bound_by_list(Link *link) {
729 Link *l;
730 int r;
731
732 assert(link);
733
734 /* Update up or down state of interfaces which depend on this interface's carrier state. */
735
736 if (hashmap_isempty(link->bound_by_links))
737 return 0;
738
739 HASHMAP_FOREACH(l, link->bound_by_links) {
740 r = link_handle_bound_to_list(l);
741 if (r < 0)
742 return r;
743 }
744
745 return 0;
746 }
747
748 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
749 int r;
750
751 assert(link);
752 assert(carrier);
753
754 if (link == carrier)
755 return 0;
756
757 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
758 return 0;
759
760 r = hashmap_ensure_put(h, NULL, INT_TO_PTR(carrier->ifindex), carrier);
761 if (r < 0)
762 return r;
763
764 link_dirty(link);
765
766 return 0;
767 }
768
769 static int link_new_bound_by_list(Link *link) {
770 Manager *m;
771 Link *carrier;
772 int r;
773
774 assert(link);
775 assert(link->manager);
776
777 m = link->manager;
778
779 HASHMAP_FOREACH(carrier, m->links_by_index) {
780 if (!carrier->network)
781 continue;
782
783 if (strv_isempty(carrier->network->bind_carrier))
784 continue;
785
786 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
787 r = link_put_carrier(link, carrier, &link->bound_by_links);
788 if (r < 0)
789 return r;
790 }
791 }
792
793 HASHMAP_FOREACH(carrier, link->bound_by_links) {
794 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
795 if (r < 0)
796 return r;
797 }
798
799 return 0;
800 }
801
802 static int link_new_bound_to_list(Link *link) {
803 Manager *m;
804 Link *carrier;
805 int r;
806
807 assert(link);
808 assert(link->manager);
809
810 if (!link->network)
811 return 0;
812
813 if (strv_isempty(link->network->bind_carrier))
814 return 0;
815
816 m = link->manager;
817
818 HASHMAP_FOREACH(carrier, m->links_by_index) {
819 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
820 r = link_put_carrier(link, carrier, &link->bound_to_links);
821 if (r < 0)
822 return r;
823 }
824 }
825
826 HASHMAP_FOREACH(carrier, link->bound_to_links) {
827 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
828 if (r < 0)
829 return r;
830 }
831
832 return 0;
833 }
834
835 static void link_free_bound_to_list(Link *link) {
836 bool updated = false;
837 Link *bound_to;
838
839 assert(link);
840
841 while ((bound_to = hashmap_steal_first(link->bound_to_links))) {
842 updated = true;
843
844 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
845 link_dirty(bound_to);
846 }
847
848 if (updated)
849 link_dirty(link);
850 }
851
852 static void link_free_bound_by_list(Link *link) {
853 bool updated = false;
854 Link *bound_by;
855
856 assert(link);
857
858 while ((bound_by = hashmap_steal_first(link->bound_by_links))) {
859 updated = true;
860
861 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
862 link_dirty(bound_by);
863 link_handle_bound_to_list(bound_by);
864 }
865 }
866
867 if (updated)
868 link_dirty(link);
869 }
870
871 static int link_append_to_master(Link *link) {
872 Link *master;
873 int r;
874
875 assert(link);
876
877 /* - The link may have no master.
878 * - RTM_NEWLINK message about master interface may not be received yet. */
879 if (link_get_master(link, &master) < 0)
880 return 0;
881
882 r = set_ensure_put(&master->slaves, NULL, link);
883 if (r <= 0)
884 return r;
885
886 link_ref(link);
887 return 0;
888 }
889
890 static void link_drop_from_master(Link *link) {
891 Link *master;
892
893 assert(link);
894
895 if (!link->manager)
896 return;
897
898 if (link_get_master(link, &master) < 0)
899 return;
900
901 link_unref(set_remove(master->slaves, link));
902 }
903
904 static void link_drop_requests(Link *link) {
905 Request *req;
906
907 assert(link);
908 assert(link->manager);
909
910 ORDERED_SET_FOREACH(req, link->manager->request_queue)
911 if (req->link == link)
912 request_detach(link->manager, req);
913 }
914
915 static Link *link_drop(Link *link) {
916 if (!link)
917 return NULL;
918
919 assert(link->manager);
920
921 link_set_state(link, LINK_STATE_LINGER);
922
923 /* Drop all references from other links and manager. Note that async netlink calls may have
924 * references to the link, and they will be dropped when we receive replies. */
925
926 link_drop_requests(link);
927
928 link_free_bound_to_list(link);
929 link_free_bound_by_list(link);
930
931 link_clear_sr_iov_ifindices(link);
932
933 link_drop_from_master(link);
934
935 if (link->state_file)
936 (void) unlink(link->state_file);
937
938 link_clean(link);
939
940 STRV_FOREACH(n, link->alternative_names)
941 hashmap_remove(link->manager->links_by_name, *n);
942 hashmap_remove(link->manager->links_by_name, link->ifname);
943
944 /* bonding master and its slaves have the same hardware address. */
945 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
946
947 /* The following must be called at last. */
948 assert_se(hashmap_remove(link->manager->links_by_index, INT_TO_PTR(link->ifindex)) == link);
949 return link_unref(link);
950 }
951
952 static int link_drop_foreign_config(Link *link) {
953 int r;
954
955 assert(link);
956 assert(link->manager);
957
958 /* Drop foreign config, but ignore unmanaged, loopback, or critical interfaces. We do not want
959 * to remove loopback address or addresses used for root NFS. */
960
961 if (IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
962 return 0;
963 if (FLAGS_SET(link->flags, IFF_LOOPBACK))
964 return 0;
965 if (link->network->keep_configuration == KEEP_CONFIGURATION_YES)
966 return 0;
967
968 r = link_drop_foreign_routes(link);
969
970 RET_GATHER(r, link_drop_foreign_nexthops(link));
971 RET_GATHER(r, link_drop_foreign_addresses(link));
972 RET_GATHER(r, link_drop_foreign_neighbors(link));
973 RET_GATHER(r, manager_drop_foreign_routing_policy_rules(link->manager));
974
975 return r;
976 }
977
978 static int link_drop_managed_config(Link *link) {
979 int r;
980
981 assert(link);
982 assert(link->manager);
983
984 r = link_drop_managed_routes(link);
985
986 RET_GATHER(r, link_drop_managed_nexthops(link));
987 RET_GATHER(r, link_drop_managed_addresses(link));
988 RET_GATHER(r, link_drop_managed_neighbors(link));
989 RET_GATHER(r, link_drop_managed_routing_policy_rules(link));
990
991 return r;
992 }
993
994 static void link_foreignize_config(Link *link) {
995 assert(link);
996 assert(link->manager);
997
998 link_foreignize_routes(link);
999 link_foreignize_nexthops(link);
1000 link_foreignize_addresses(link);
1001 link_foreignize_neighbors(link);
1002 link_foreignize_routing_policy_rules(link);
1003 }
1004
1005 static int link_configure(Link *link) {
1006 int r;
1007
1008 assert(link);
1009 assert(link->network);
1010 assert(link->state == LINK_STATE_INITIALIZED);
1011
1012 link_set_state(link, LINK_STATE_CONFIGURING);
1013
1014 r = link_new_bound_to_list(link);
1015 if (r < 0)
1016 return r;
1017
1018 r = link_request_traffic_control(link);
1019 if (r < 0)
1020 return r;
1021
1022 if (link->iftype == ARPHRD_CAN) {
1023 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1024 r = link_request_to_set_can(link);
1025 if (r < 0)
1026 return r;
1027
1028 return link_request_to_activate(link);
1029 }
1030
1031 r = link_request_sr_iov_vfs(link);
1032 if (r < 0)
1033 return r;
1034
1035 r = link_set_sysctl(link);
1036 if (r < 0)
1037 return r;
1038
1039 r = link_request_to_set_mac(link, /* allow_retry = */ true);
1040 if (r < 0)
1041 return r;
1042
1043 r = link_request_to_set_ipoib(link);
1044 if (r < 0)
1045 return r;
1046
1047 r = link_request_to_set_flags(link);
1048 if (r < 0)
1049 return r;
1050
1051 r = link_request_to_set_group(link);
1052 if (r < 0)
1053 return r;
1054
1055 r = link_configure_mtu(link);
1056 if (r < 0)
1057 return r;
1058
1059 r = link_request_to_set_addrgen_mode(link);
1060 if (r < 0)
1061 return r;
1062
1063 r = link_request_to_set_master(link);
1064 if (r < 0)
1065 return r;
1066
1067 r = link_request_stacked_netdevs(link);
1068 if (r < 0)
1069 return r;
1070
1071 r = link_request_to_set_bond(link);
1072 if (r < 0)
1073 return r;
1074
1075 r = link_request_to_set_bridge(link);
1076 if (r < 0)
1077 return r;
1078
1079 r = link_request_to_set_bridge_vlan(link);
1080 if (r < 0)
1081 return r;
1082
1083 r = link_request_to_activate(link);
1084 if (r < 0)
1085 return r;
1086
1087 r = ipv4ll_configure(link);
1088 if (r < 0)
1089 return r;
1090
1091 r = link_request_dhcp4_client(link);
1092 if (r < 0)
1093 return r;
1094
1095 r = link_request_dhcp6_client(link);
1096 if (r < 0)
1097 return r;
1098
1099 r = link_request_ndisc(link);
1100 if (r < 0)
1101 return r;
1102
1103 r = link_request_dhcp_server(link);
1104 if (r < 0)
1105 return r;
1106
1107 r = link_request_radv(link);
1108 if (r < 0)
1109 return r;
1110
1111 r = link_lldp_rx_configure(link);
1112 if (r < 0)
1113 return r;
1114
1115 r = link_lldp_tx_configure(link);
1116 if (r < 0)
1117 return r;
1118
1119 r = link_drop_foreign_config(link);
1120 if (r < 0)
1121 return r;
1122
1123 r = link_request_static_configs(link);
1124 if (r < 0)
1125 return r;
1126
1127 if (!link_has_carrier(link))
1128 return 0;
1129
1130 return link_acquire_dynamic_conf(link);
1131 }
1132
1133 static int link_get_network(Link *link, Network **ret) {
1134 Network *network;
1135 int r;
1136
1137 assert(link);
1138 assert(link->manager);
1139 assert(ret);
1140
1141 ORDERED_HASHMAP_FOREACH(network, link->manager->networks) {
1142 bool warn = false;
1143
1144 r = net_match_config(
1145 &network->match,
1146 link->dev,
1147 &link->hw_addr,
1148 &link->permanent_hw_addr,
1149 link->driver,
1150 link->iftype,
1151 link->kind,
1152 link->ifname,
1153 link->alternative_names,
1154 link->wlan_iftype,
1155 link->ssid,
1156 &link->bssid);
1157 if (r < 0)
1158 return r;
1159 if (r == 0)
1160 continue;
1161
1162 if (network->match.ifname && link->dev) {
1163 uint8_t name_assign_type = NET_NAME_UNKNOWN;
1164 const char *attr;
1165
1166 if (sd_device_get_sysattr_value(link->dev, "name_assign_type", &attr) >= 0)
1167 (void) safe_atou8(attr, &name_assign_type);
1168
1169 warn = name_assign_type == NET_NAME_ENUM;
1170 }
1171
1172 log_link_full(link, warn ? LOG_WARNING : LOG_DEBUG,
1173 "found matching network '%s'%s.",
1174 network->filename,
1175 warn ? ", based on potentially unpredictable interface name" : "");
1176
1177 if (network->unmanaged)
1178 return -ENOENT;
1179
1180 *ret = network;
1181 return 0;
1182 }
1183
1184 return -ENOENT;
1185 }
1186
1187 int link_reconfigure_impl(Link *link, bool force) {
1188 Network *network = NULL;
1189 NetDev *netdev = NULL;
1190 int r;
1191
1192 assert(link);
1193
1194 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
1195 return 0;
1196
1197 r = netdev_get(link->manager, link->ifname, &netdev);
1198 if (r < 0 && r != -ENOENT)
1199 return r;
1200
1201 r = link_get_network(link, &network);
1202 if (r < 0 && r != -ENOENT)
1203 return r;
1204
1205 if (link->state != LINK_STATE_UNMANAGED && !network)
1206 /* If link is in initialized state, then link->network is also NULL. */
1207 force = true;
1208
1209 if (link->network == network && !force)
1210 return 0;
1211
1212 if (network) {
1213 if (link->state == LINK_STATE_INITIALIZED)
1214 log_link_info(link, "Configuring with %s.", network->filename);
1215 else
1216 log_link_info(link, "Reconfiguring with %s.", network->filename);
1217 } else
1218 log_link_full(link, link->state == LINK_STATE_INITIALIZED ? LOG_DEBUG : LOG_INFO,
1219 "Unmanaging interface.");
1220
1221 /* Dropping old .network file */
1222 r = link_stop_engines(link, false);
1223 if (r < 0)
1224 return r;
1225
1226 link_drop_requests(link);
1227
1228 if (network && !force && network->keep_configuration != KEEP_CONFIGURATION_YES)
1229 /* When a new/updated .network file is assigned, first make all configs (addresses,
1230 * routes, and so on) foreign, and then drop unnecessary configs later by
1231 * link_drop_foreign_config() in link_configure().
1232 * Note, when KeepConfiguration=yes, link_drop_foreign_config() does nothing. Hence,
1233 * here we need to drop the configs such as addresses, routes, and so on configured by
1234 * the previously assigned .network file. */
1235 link_foreignize_config(link);
1236 else {
1237 /* Remove all managed configs. Note, foreign configs are removed in later by
1238 * link_configure() -> link_drop_foreign_config() if the link is managed by us. */
1239 r = link_drop_managed_config(link);
1240 if (r < 0)
1241 return r;
1242 }
1243
1244 /* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the
1245 * bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will
1246 * not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the
1247 * map here, as it depends on .network files assigned to other links. */
1248 link_free_bound_to_list(link);
1249
1250 link_free_engines(link);
1251 link->network = network_unref(link->network);
1252
1253 netdev_unref(link->netdev);
1254 link->netdev = netdev_ref(netdev);
1255
1256 if (!network) {
1257 link_set_state(link, LINK_STATE_UNMANAGED);
1258 return 0;
1259 }
1260
1261 /* Then, apply new .network file */
1262 link->network = network_ref(network);
1263 link_update_operstate(link, true);
1264 link_dirty(link);
1265
1266 link_set_state(link, LINK_STATE_INITIALIZED);
1267 link->activated = false;
1268
1269 r = link_configure(link);
1270 if (r < 0)
1271 return r;
1272
1273 return 1;
1274 }
1275
1276 static int link_reconfigure_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, bool force) {
1277 int r;
1278
1279 assert(link);
1280
1281 r = link_getlink_handler_internal(rtnl, m, link, "Failed to update link state");
1282 if (r <= 0)
1283 return r;
1284
1285 r = link_reconfigure_impl(link, force);
1286 if (r < 0) {
1287 link_enter_failed(link);
1288 return 0;
1289 }
1290
1291 return r;
1292 }
1293
1294 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1295 return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ false);
1296 }
1297
1298 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1299 return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ true);
1300 }
1301
1302 int link_reconfigure(Link *link, bool force) {
1303 int r;
1304
1305 assert(link);
1306
1307 /* When link in pending or initialized state, then link_configure() will be called. To prevent
1308 * the function from being called multiple times simultaneously, refuse to reconfigure the
1309 * interface in these cases. */
1310 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
1311 return 0; /* 0 means no-op. */
1312
1313 r = link_call_getlink(link, force ? link_force_reconfigure_handler : link_reconfigure_handler);
1314 if (r < 0)
1315 return r;
1316
1317 return 1; /* 1 means the interface will be reconfigured. */
1318 }
1319
1320 static int link_initialized_and_synced(Link *link) {
1321 int r;
1322
1323 assert(link);
1324 assert(link->manager);
1325
1326 if (link->manager->test_mode) {
1327 log_link_debug(link, "Running in test mode, refusing to enter initialized state.");
1328 link_set_state(link, LINK_STATE_UNMANAGED);
1329 return 0;
1330 }
1331
1332 if (link->state == LINK_STATE_PENDING) {
1333 log_link_debug(link, "Link state is up-to-date");
1334 link_set_state(link, LINK_STATE_INITIALIZED);
1335
1336 r = link_new_bound_by_list(link);
1337 if (r < 0)
1338 return r;
1339
1340 r = link_handle_bound_by_list(link);
1341 if (r < 0)
1342 return r;
1343 }
1344
1345 return link_reconfigure_impl(link, /* force = */ false);
1346 }
1347
1348 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1349 int r;
1350
1351 r = link_getlink_handler_internal(rtnl, m, link, "Failed to wait for the interface to be initialized");
1352 if (r <= 0)
1353 return r;
1354
1355 r = link_initialized_and_synced(link);
1356 if (r < 0)
1357 link_enter_failed(link);
1358
1359 return 0;
1360 }
1361
1362 static int link_initialized(Link *link, sd_device *device) {
1363 int r;
1364
1365 assert(link);
1366 assert(device);
1367
1368 /* Always replace with the new sd_device object. As the sysname (and possibly other properties
1369 * or sysattrs) may be outdated. */
1370 device_unref_and_replace(link->dev, device);
1371
1372 if (link->dhcp_client) {
1373 r = sd_dhcp_client_attach_device(link->dhcp_client, link->dev);
1374 if (r < 0)
1375 log_link_warning_errno(link, r, "Failed to attach device to DHCPv4 client, ignoring: %m");
1376 }
1377
1378 if (link->dhcp6_client) {
1379 r = sd_dhcp6_client_attach_device(link->dhcp6_client, link->dev);
1380 if (r < 0)
1381 log_link_warning_errno(link, r, "Failed to attach device to DHCPv6 client, ignoring: %m");
1382 }
1383
1384 r = link_set_sr_iov_ifindices(link);
1385 if (r < 0)
1386 log_link_warning_errno(link, r, "Failed to manage SR-IOV PF and VF ports, ignoring: %m");
1387
1388 if (link->state != LINK_STATE_PENDING)
1389 return link_reconfigure(link, /* force = */ false);
1390
1391 log_link_debug(link, "udev initialized link");
1392
1393 /* udev has initialized the link, but we don't know if we have yet
1394 * processed the NEWLINK messages with the latest state. Do a GETLINK,
1395 * when it returns we know that the pending NEWLINKs have already been
1396 * processed and that we are up-to-date */
1397
1398 return link_call_getlink(link, link_initialized_handler);
1399 }
1400
1401 static int link_check_initialized(Link *link) {
1402 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
1403 int r;
1404
1405 assert(link);
1406
1407 if (!udev_available())
1408 return link_initialized_and_synced(link);
1409
1410 /* udev should be around */
1411 r = sd_device_new_from_ifindex(&device, link->ifindex);
1412 if (r < 0) {
1413 log_link_debug_errno(link, r, "Could not find device, waiting for device initialization: %m");
1414 return 0;
1415 }
1416
1417 r = sd_device_get_is_initialized(device);
1418 if (r < 0)
1419 return log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
1420 if (r == 0) {
1421 /* not yet ready */
1422 log_link_debug(link, "link pending udev initialization...");
1423 return 0;
1424 }
1425
1426 r = device_is_renaming(device);
1427 if (r < 0)
1428 return log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
1429 if (r > 0) {
1430 log_link_debug(link, "Interface is being renamed, pending initialization.");
1431 return 0;
1432 }
1433
1434 return link_initialized(link, device);
1435 }
1436
1437 int manager_udev_process_link(Manager *m, sd_device *device, sd_device_action_t action) {
1438 int r, ifindex;
1439 Link *link;
1440
1441 assert(m);
1442 assert(device);
1443
1444 r = sd_device_get_ifindex(device, &ifindex);
1445 if (r < 0)
1446 return log_device_debug_errno(device, r, "Failed to get ifindex: %m");
1447
1448 r = link_get_by_index(m, ifindex, &link);
1449 if (r < 0) {
1450 /* This error is not critical, as the corresponding rtnl message may be received later. */
1451 log_device_debug_errno(device, r, "Failed to get link from ifindex %i, ignoring: %m", ifindex);
1452 return 0;
1453 }
1454
1455 /* Let's unref the sd-device object assigned to the corresponding Link object, but keep the Link
1456 * object here. It will be removed only when rtnetlink says so. */
1457 if (action == SD_DEVICE_REMOVE) {
1458 link->dev = sd_device_unref(link->dev);
1459 return 0;
1460 }
1461
1462 r = device_is_renaming(device);
1463 if (r < 0)
1464 return log_device_debug_errno(device, r, "Failed to determine if the device is renaming or not: %m");
1465 if (r > 0) {
1466 log_device_debug(device, "Device is renaming, waiting for the interface to be renamed.");
1467 /* TODO:
1468 * What happens when a device is initialized, then soon renamed after that? When we detect
1469 * such, maybe we should cancel or postpone all queued requests for the interface. */
1470 return 0;
1471 }
1472
1473 r = link_initialized(link, device);
1474 if (r < 0)
1475 link_enter_failed(link);
1476
1477 return 0;
1478 }
1479
1480 static int link_carrier_gained(Link *link) {
1481 bool force_reconfigure;
1482 int r;
1483
1484 assert(link);
1485
1486 r = event_source_disable(link->carrier_lost_timer);
1487 if (r < 0)
1488 log_link_warning_errno(link, r, "Failed to disable carrier lost timer, ignoring: %m");
1489
1490 /* If a wireless interface was connected to an access point, and the SSID is changed (that is,
1491 * both previous_ssid and ssid are non-NULL), then the connected wireless network could be
1492 * changed. So, always reconfigure the link. Which means e.g. the DHCP client will be
1493 * restarted, and the correct network information will be gained.
1494 *
1495 * However, do not reconfigure the wireless interface forcibly if it was not connected to any
1496 * access points previously (previous_ssid is NULL in this case). As, a .network file may be
1497 * already assigned to the interface (in that case, the .network file does not have the SSID=
1498 * setting in the [Match] section), and the interface is already being configured. Of course,
1499 * there may exist another .network file with higher priority and a matching SSID= setting. But
1500 * in that case, link_reconfigure_impl() can handle that without the force_reconfigure flag.
1501 *
1502 * For non-wireless interfaces, we have no way to detect the connected network change. So,
1503 * setting force_reconfigure = false. Note, both ssid and previous_ssid are NULL in that case. */
1504 force_reconfigure = link->previous_ssid && !streq_ptr(link->previous_ssid, link->ssid);
1505 link->previous_ssid = mfree(link->previous_ssid);
1506
1507 /* AP and P2P-GO interfaces may have a new SSID - update the link properties in case a new .network
1508 * profile wants to match on it with SSID= in its [Match] section.
1509 */
1510 if (IN_SET(link->wlan_iftype, NL80211_IFTYPE_AP, NL80211_IFTYPE_P2P_GO)) {
1511 r = link_get_wlan_interface(link);
1512 if (r < 0)
1513 return r;
1514 }
1515
1516 /* At this stage, both wlan and link information should be up-to-date. Hence, it is not necessary to
1517 * call RTM_GETLINK, NL80211_CMD_GET_INTERFACE, or NL80211_CMD_GET_STATION commands, and simply call
1518 * link_reconfigure_impl(). Note, link_reconfigure_impl() returns 1 when the link is reconfigured. */
1519 r = link_reconfigure_impl(link, force_reconfigure);
1520 if (r != 0)
1521 return r;
1522
1523 r = link_handle_bound_by_list(link);
1524 if (r < 0)
1525 return r;
1526
1527 if (link->iftype == ARPHRD_CAN)
1528 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1529 return 0;
1530
1531 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
1532 r = link_acquire_dynamic_conf(link);
1533 if (r < 0)
1534 return r;
1535
1536 r = link_request_static_configs(link);
1537 if (r < 0)
1538 return r;
1539 }
1540
1541 return 0;
1542 }
1543
1544 static int link_carrier_lost_impl(Link *link) {
1545 int r, ret = 0;
1546
1547 assert(link);
1548
1549 link->previous_ssid = mfree(link->previous_ssid);
1550
1551 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1552 return 0;
1553
1554 if (!link->network)
1555 return 0;
1556
1557 r = link_stop_engines(link, false);
1558 if (r < 0)
1559 ret = r;
1560
1561 r = link_drop_managed_config(link);
1562 if (r < 0 && ret >= 0)
1563 ret = r;
1564
1565 return ret;
1566 }
1567
1568 static int link_carrier_lost_handler(sd_event_source *s, uint64_t usec, void *userdata) {
1569 Link *link = ASSERT_PTR(userdata);
1570 int r;
1571
1572 r = link_carrier_lost_impl(link);
1573 if (r < 0) {
1574 log_link_warning_errno(link, r, "Failed to process carrier lost event: %m");
1575 link_enter_failed(link);
1576 }
1577
1578 return 0;
1579 }
1580
1581 static int link_carrier_lost(Link *link) {
1582 uint16_t dhcp_mtu;
1583 usec_t usec;
1584 int r;
1585
1586 assert(link);
1587
1588 r = link_handle_bound_by_list(link);
1589 if (r < 0)
1590 return r;
1591
1592 if (link->iftype == ARPHRD_CAN)
1593 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1594 return 0;
1595
1596 if (!link->network)
1597 return 0;
1598
1599 if (link->network->ignore_carrier_loss_set)
1600 /* If IgnoreCarrierLoss= is explicitly specified, then use the specified value. */
1601 usec = link->network->ignore_carrier_loss_usec;
1602
1603 else if (link->network->bond && link->wlan_iftype > 0)
1604 /* Enslaving wlan interface to a bond disconnects from the connected AP, and causes its
1605 * carrier to be lost. See #19832. */
1606 usec = 3 * USEC_PER_SEC;
1607
1608 else if (link->network->dhcp_use_mtu &&
1609 link->dhcp_lease &&
1610 sd_dhcp_lease_get_mtu(link->dhcp_lease, &dhcp_mtu) >= 0 &&
1611 dhcp_mtu != link->original_mtu)
1612 /* Some drivers reset interfaces when changing MTU. Resetting interfaces by the static
1613 * MTU should not cause any issues, as MTU is changed only once. However, setting MTU
1614 * through DHCP lease causes an infinite loop of resetting the interface. See #18738. */
1615 usec = 5 * USEC_PER_SEC;
1616
1617 else
1618 /* Otherwise, use the currently set value. */
1619 usec = link->network->ignore_carrier_loss_usec;
1620
1621 if (usec == USEC_INFINITY)
1622 return 0;
1623
1624 if (usec == 0)
1625 return link_carrier_lost_impl(link);
1626
1627 return event_reset_time_relative(link->manager->event,
1628 &link->carrier_lost_timer,
1629 CLOCK_BOOTTIME,
1630 usec,
1631 0,
1632 link_carrier_lost_handler,
1633 link,
1634 0,
1635 "link-carrier-loss",
1636 true);
1637 }
1638
1639 static int link_admin_state_up(Link *link) {
1640 int r;
1641
1642 assert(link);
1643
1644 /* This is called every time an interface admin state changes to up;
1645 * specifically, when IFF_UP flag changes from unset to set. */
1646
1647 if (!link->network)
1648 return 0;
1649
1650 if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_DOWN) {
1651 log_link_info(link, "Activation policy is \"always-down\", forcing link down.");
1652 return link_request_to_bring_up_or_down(link, /* up = */ false);
1653 }
1654
1655 /* We set the ipv6 mtu after the device mtu, but the kernel resets
1656 * ipv6 mtu on NETDEV_UP, so we need to reset it. */
1657 r = link_set_ipv6_mtu(link);
1658 if (r < 0)
1659 log_link_warning_errno(link, r, "Cannot set IPv6 MTU, ignoring: %m");
1660
1661 return 0;
1662 }
1663
1664 static int link_admin_state_down(Link *link) {
1665 assert(link);
1666
1667 if (!link->network)
1668 return 0;
1669
1670 if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) {
1671 log_link_info(link, "Activation policy is \"always-up\", forcing link up.");
1672 return link_request_to_bring_up_or_down(link, /* up = */ true);
1673 }
1674
1675 return 0;
1676 }
1677
1678 static bool link_is_enslaved(Link *link) {
1679 if (link->flags & IFF_SLAVE)
1680 return true;
1681
1682 if (link->master_ifindex > 0)
1683 return true;
1684
1685 return false;
1686 }
1687
1688 static LinkAddressState address_state_from_scope(uint8_t scope) {
1689 if (scope < RT_SCOPE_SITE)
1690 /* universally accessible addresses found */
1691 return LINK_ADDRESS_STATE_ROUTABLE;
1692
1693 if (scope < RT_SCOPE_HOST)
1694 /* only link or site local addresses found */
1695 return LINK_ADDRESS_STATE_DEGRADED;
1696
1697 /* no useful addresses found */
1698 return LINK_ADDRESS_STATE_OFF;
1699 }
1700
1701 void link_update_operstate(Link *link, bool also_update_master) {
1702 LinkOperationalState operstate;
1703 LinkCarrierState carrier_state;
1704 LinkAddressState ipv4_address_state, ipv6_address_state, address_state;
1705 LinkOnlineState online_state;
1706 _cleanup_strv_free_ char **p = NULL;
1707 uint8_t ipv4_scope = RT_SCOPE_NOWHERE, ipv6_scope = RT_SCOPE_NOWHERE;
1708 bool changed = false;
1709 Address *address;
1710
1711 assert(link);
1712
1713 if (link->kernel_operstate == IF_OPER_DORMANT)
1714 carrier_state = LINK_CARRIER_STATE_DORMANT;
1715 else if (link_has_carrier(link)) {
1716 if (link_is_enslaved(link))
1717 carrier_state = LINK_CARRIER_STATE_ENSLAVED;
1718 else
1719 carrier_state = LINK_CARRIER_STATE_CARRIER;
1720 } else if (link->flags & IFF_UP)
1721 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
1722 else
1723 carrier_state = LINK_CARRIER_STATE_OFF;
1724
1725 if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
1726 Link *slave;
1727
1728 SET_FOREACH(slave, link->slaves) {
1729 link_update_operstate(slave, false);
1730
1731 if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
1732 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
1733 }
1734 }
1735
1736 SET_FOREACH(address, link->addresses) {
1737 if (!address_is_ready(address))
1738 continue;
1739
1740 if (address->family == AF_INET)
1741 ipv4_scope = MIN(ipv4_scope, address->scope);
1742
1743 if (address->family == AF_INET6)
1744 ipv6_scope = MIN(ipv6_scope, address->scope);
1745 }
1746
1747 ipv4_address_state = address_state_from_scope(ipv4_scope);
1748 ipv6_address_state = address_state_from_scope(ipv6_scope);
1749 address_state = address_state_from_scope(MIN(ipv4_scope, ipv6_scope));
1750
1751 /* Mapping of address and carrier state vs operational state
1752 * carrier state
1753 * | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
1754 * ------------------------------------------------------------------------------
1755 * off | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
1756 * address_state degraded | off | no-carrier | dormant | degraded | degraded | enslaved
1757 * routable | off | no-carrier | dormant | routable | routable | routable
1758 */
1759
1760 if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_ROUTABLE)
1761 operstate = LINK_OPERSTATE_ROUTABLE;
1762 else if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_DEGRADED)
1763 operstate = LINK_OPERSTATE_DEGRADED;
1764 else if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
1765 operstate = (LinkOperationalState) carrier_state;
1766 else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
1767 operstate = LINK_OPERSTATE_ROUTABLE;
1768 else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
1769 operstate = LINK_OPERSTATE_DEGRADED;
1770 else
1771 operstate = LINK_OPERSTATE_ENSLAVED;
1772
1773 /* Only determine online state for managed links with RequiredForOnline=yes */
1774 if (!link->network || !link->network->required_for_online)
1775 online_state = _LINK_ONLINE_STATE_INVALID;
1776 else if (operstate < link->network->required_operstate_for_online.min ||
1777 operstate > link->network->required_operstate_for_online.max)
1778 online_state = LINK_ONLINE_STATE_OFFLINE;
1779 else {
1780 AddressFamily required_family = link->network->required_family_for_online;
1781 bool needs_ipv4 = required_family & ADDRESS_FAMILY_IPV4;
1782 bool needs_ipv6 = required_family & ADDRESS_FAMILY_IPV6;
1783
1784 /* The operational state is within the range required for online.
1785 * If a particular address family is also required, we might revert
1786 * to offline in the blocks below. */
1787 online_state = LINK_ONLINE_STATE_ONLINE;
1788
1789 if (link->network->required_operstate_for_online.min >= LINK_OPERSTATE_DEGRADED) {
1790 if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_DEGRADED)
1791 online_state = LINK_ONLINE_STATE_OFFLINE;
1792 if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_DEGRADED)
1793 online_state = LINK_ONLINE_STATE_OFFLINE;
1794 }
1795
1796 if (link->network->required_operstate_for_online.min >= LINK_OPERSTATE_ROUTABLE) {
1797 if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1798 online_state = LINK_ONLINE_STATE_OFFLINE;
1799 if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1800 online_state = LINK_ONLINE_STATE_OFFLINE;
1801 }
1802 }
1803
1804 if (link->carrier_state != carrier_state) {
1805 link->carrier_state = carrier_state;
1806 changed = true;
1807 if (strv_extend(&p, "CarrierState") < 0)
1808 log_oom();
1809 }
1810
1811 if (link->address_state != address_state) {
1812 link->address_state = address_state;
1813 changed = true;
1814 if (strv_extend(&p, "AddressState") < 0)
1815 log_oom();
1816 }
1817
1818 if (link->ipv4_address_state != ipv4_address_state) {
1819 link->ipv4_address_state = ipv4_address_state;
1820 changed = true;
1821 if (strv_extend(&p, "IPv4AddressState") < 0)
1822 log_oom();
1823 }
1824
1825 if (link->ipv6_address_state != ipv6_address_state) {
1826 link->ipv6_address_state = ipv6_address_state;
1827 changed = true;
1828 if (strv_extend(&p, "IPv6AddressState") < 0)
1829 log_oom();
1830 }
1831
1832 if (link->operstate != operstate) {
1833 link->operstate = operstate;
1834 changed = true;
1835 if (strv_extend(&p, "OperationalState") < 0)
1836 log_oom();
1837 }
1838
1839 if (link->online_state != online_state) {
1840 link->online_state = online_state;
1841 changed = true;
1842 if (strv_extend(&p, "OnlineState") < 0)
1843 log_oom();
1844 }
1845
1846 if (p)
1847 link_send_changed_strv(link, p);
1848 if (changed)
1849 link_dirty(link);
1850
1851 if (also_update_master) {
1852 Link *master;
1853
1854 if (link_get_master(link, &master) >= 0)
1855 link_update_operstate(master, true);
1856 }
1857 }
1858
1859 #define FLAG_STRING(string, flag, old, new) \
1860 (((old ^ new) & flag) \
1861 ? ((old & flag) ? (" -" string) : (" +" string)) \
1862 : "")
1863
1864 static int link_update_flags(Link *link, sd_netlink_message *message) {
1865 bool link_was_admin_up, had_carrier;
1866 uint8_t operstate;
1867 unsigned flags;
1868 int r;
1869
1870 assert(link);
1871 assert(message);
1872
1873 r = sd_rtnl_message_link_get_flags(message, &flags);
1874 if (r < 0)
1875 return log_link_debug_errno(link, r, "rtnl: failed to read link flags: %m");
1876
1877 r = sd_netlink_message_read_u8(message, IFLA_OPERSTATE, &operstate);
1878 if (r == -ENODATA)
1879 /* If we got a message without operstate, assume the state was unchanged. */
1880 operstate = link->kernel_operstate;
1881 else if (r < 0)
1882 return log_link_debug_errno(link, r, "rtnl: failed to read operational state: %m");
1883
1884 if (link->flags == flags && link->kernel_operstate == operstate)
1885 return 0;
1886
1887 if (link->flags != flags) {
1888 unsigned unknown_flags, unknown_flags_added, unknown_flags_removed;
1889
1890 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",
1891 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
1892 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
1893 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
1894 FLAG_STRING("UP", IFF_UP, link->flags, flags),
1895 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
1896 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
1897 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
1898 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
1899 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
1900 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
1901 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
1902 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
1903 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
1904 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
1905 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
1906 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
1907 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
1908 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
1909 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
1910
1911 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
1912 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
1913 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
1914 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
1915 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
1916 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
1917 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
1918 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
1919
1920 if (unknown_flags_added)
1921 log_link_debug(link, "Unknown link flags gained, ignoring: %#.5x", unknown_flags_added);
1922
1923 if (unknown_flags_removed)
1924 log_link_debug(link, "Unknown link flags lost, ignoring: %#.5x", unknown_flags_removed);
1925 }
1926
1927 link_was_admin_up = link->flags & IFF_UP;
1928 had_carrier = link_has_carrier(link);
1929
1930 link->flags = flags;
1931 link->kernel_operstate = operstate;
1932
1933 link_update_operstate(link, true);
1934
1935 if (!link_was_admin_up && (link->flags & IFF_UP)) {
1936 log_link_info(link, "Link UP");
1937
1938 r = link_admin_state_up(link);
1939 if (r < 0)
1940 return r;
1941 } else if (link_was_admin_up && !(link->flags & IFF_UP)) {
1942 log_link_info(link, "Link DOWN");
1943
1944 r = link_admin_state_down(link);
1945 if (r < 0)
1946 return r;
1947 }
1948
1949 if (!had_carrier && link_has_carrier(link)) {
1950 log_link_info(link, "Gained carrier");
1951
1952 r = link_carrier_gained(link);
1953 if (r < 0)
1954 return r;
1955 } else if (had_carrier && !link_has_carrier(link)) {
1956 log_link_info(link, "Lost carrier");
1957
1958 r = link_carrier_lost(link);
1959 if (r < 0)
1960 return r;
1961 }
1962
1963 return 0;
1964 }
1965
1966 static int link_update_master(Link *link, sd_netlink_message *message) {
1967 int master_ifindex, r;
1968
1969 assert(link);
1970 assert(message);
1971
1972 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t*) &master_ifindex);
1973 if (r == -ENODATA)
1974 return 0;
1975 if (r < 0)
1976 return log_link_debug_errno(link, r, "rtnl: failed to read master ifindex: %m");
1977
1978 if (master_ifindex == link->ifindex)
1979 master_ifindex = 0;
1980
1981 if (master_ifindex == link->master_ifindex)
1982 return 0;
1983
1984 if (link->master_ifindex == 0)
1985 log_link_debug(link, "Attached to master interface: %i", master_ifindex);
1986 else if (master_ifindex == 0)
1987 log_link_debug(link, "Detached from master interface: %i", link->master_ifindex);
1988 else
1989 log_link_debug(link, "Master interface changed: %i %s %i", link->master_ifindex,
1990 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), master_ifindex);
1991
1992 link_drop_from_master(link);
1993
1994 link->master_ifindex = master_ifindex;
1995
1996 r = link_append_to_master(link);
1997 if (r < 0)
1998 return log_link_debug_errno(link, r, "Failed to append link to master: %m");
1999
2000 return 0;
2001 }
2002
2003 static int link_update_driver(Link *link, sd_netlink_message *message) {
2004 int r;
2005
2006 assert(link);
2007 assert(link->manager);
2008 assert(message);
2009
2010 /* Driver is already read. Assuming the driver is never changed. */
2011 if (link->ethtool_driver_read)
2012 return 0;
2013
2014 /* When udevd is running, read the driver after the interface is initialized by udevd.
2015 * Otherwise, ethtool may not work correctly. See issue #22538.
2016 * When udevd is not running, read the value when the interface is detected. */
2017 if (udev_available() && !link->dev)
2018 return 0;
2019
2020 link->ethtool_driver_read = true;
2021
2022 r = ethtool_get_driver(&link->manager->ethtool_fd, link->ifname, &link->driver);
2023 if (r < 0) {
2024 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
2025 return 0;
2026 }
2027
2028 log_link_debug(link, "Found driver: %s", strna(link->driver));
2029
2030 if (streq_ptr(link->driver, "dsa")) {
2031 uint32_t dsa_master_ifindex = 0;
2032
2033 r = sd_netlink_message_read_u32(message, IFLA_LINK, &dsa_master_ifindex);
2034 if (r < 0 && r != -ENODATA)
2035 return log_link_debug_errno(link, r, "rtnl: failed to read ifindex of the DSA master interface: %m");
2036
2037 if (dsa_master_ifindex > INT_MAX) {
2038 log_link_debug(link, "rtnl: received too large DSA master ifindex (%"PRIu32" > INT_MAX), ignoring.",
2039 dsa_master_ifindex);
2040 dsa_master_ifindex = 0;
2041 }
2042
2043 link->dsa_master_ifindex = (int) dsa_master_ifindex;
2044 }
2045
2046 return 1; /* needs reconfigure */
2047 }
2048
2049 static int link_update_permanent_hardware_address_from_ethtool(Link *link, sd_netlink_message *message) {
2050 int r;
2051
2052 assert(link);
2053 assert(link->manager);
2054 assert(message);
2055
2056 if (link->ethtool_permanent_hw_addr_read)
2057 return 0;
2058
2059 /* When udevd is running, read the permanent hardware address after the interface is
2060 * initialized by udevd. Otherwise, ethtool may not work correctly. See issue #22538.
2061 * When udevd is not running, read the value when the interface is detected. */
2062 if (udev_available() && !link->dev)
2063 return 0;
2064
2065 /* If the interface does not have a hardware address, then it will not have a permanent address either. */
2066 r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, NULL);
2067 if (r == -ENODATA)
2068 return 0;
2069 if (r < 0)
2070 return log_link_debug_errno(link, r, "Failed to read IFLA_ADDRESS attribute: %m");
2071
2072 link->ethtool_permanent_hw_addr_read = true;
2073
2074 r = ethtool_get_permanent_hw_addr(&link->manager->ethtool_fd, link->ifname, &link->permanent_hw_addr);
2075 if (r < 0)
2076 log_link_debug_errno(link, r, "Permanent hardware address not found, continuing without: %m");
2077
2078 return 0;
2079 }
2080
2081 static int link_update_permanent_hardware_address(Link *link, sd_netlink_message *message) {
2082 int r;
2083
2084 assert(link);
2085 assert(link->manager);
2086 assert(message);
2087
2088 if (link->permanent_hw_addr.length > 0)
2089 return 0;
2090
2091 r = netlink_message_read_hw_addr(message, IFLA_PERM_ADDRESS, &link->permanent_hw_addr);
2092 if (r < 0) {
2093 if (r != -ENODATA)
2094 return log_link_debug_errno(link, r, "Failed to read IFLA_PERM_ADDRESS attribute: %m");
2095
2096 /* Fallback to ethtool for older kernels. */
2097 r = link_update_permanent_hardware_address_from_ethtool(link, message);
2098 if (r < 0)
2099 return r;
2100 }
2101
2102 if (link->permanent_hw_addr.length > 0)
2103 log_link_debug(link, "Saved permanent hardware address: %s", HW_ADDR_TO_STR(&link->permanent_hw_addr));
2104
2105 return 1; /* needs reconfigure */
2106 }
2107
2108 static int link_update_hardware_address(Link *link, sd_netlink_message *message) {
2109 struct hw_addr_data addr;
2110 int r;
2111
2112 assert(link);
2113 assert(message);
2114
2115 r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr);
2116 if (r < 0 && r != -ENODATA)
2117 return log_link_debug_errno(link, r, "rtnl: failed to read broadcast address: %m");
2118
2119 r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &addr);
2120 if (r == -ENODATA)
2121 return 0;
2122 if (r < 0)
2123 return log_link_debug_errno(link, r, "rtnl: failed to read hardware address: %m");
2124
2125 if (hw_addr_equal(&link->hw_addr, &addr))
2126 return 0;
2127
2128 if (link->hw_addr.length == 0)
2129 log_link_debug(link, "Saved hardware address: %s", HW_ADDR_TO_STR(&addr));
2130 else {
2131 log_link_debug(link, "Hardware address is changed: %s %s %s",
2132 HW_ADDR_TO_STR(&link->hw_addr),
2133 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT),
2134 HW_ADDR_TO_STR(&addr));
2135
2136 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
2137 }
2138
2139 link->hw_addr = addr;
2140
2141 if (!hw_addr_is_null(&link->hw_addr)) {
2142 r = hashmap_ensure_put(&link->manager->links_by_hw_addr, &hw_addr_hash_ops, &link->hw_addr, link);
2143 if (r == -EEXIST && streq_ptr(link->kind, "bond"))
2144 /* bonding master and its slaves have the same hardware address. */
2145 r = hashmap_replace(link->manager->links_by_hw_addr, &link->hw_addr, link);
2146 if (r < 0)
2147 log_link_debug_errno(link, r, "Failed to manage link by its new hardware address, ignoring: %m");
2148 }
2149
2150 r = ipv4acd_update_mac(link);
2151 if (r < 0)
2152 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m");
2153
2154 r = ipv4ll_update_mac(link);
2155 if (r < 0)
2156 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
2157
2158 r = dhcp4_update_mac(link);
2159 if (r < 0)
2160 return log_link_debug_errno(link, r, "Could not update MAC address in DHCP client: %m");
2161
2162 r = dhcp6_update_mac(link);
2163 if (r < 0)
2164 return log_link_debug_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
2165
2166 r = radv_update_mac(link);
2167 if (r < 0)
2168 return log_link_debug_errno(link, r, "Could not update MAC address for Router Advertisement: %m");
2169
2170 if (link->ndisc && link->hw_addr.length == ETH_ALEN) {
2171 r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether);
2172 if (r < 0)
2173 return log_link_debug_errno(link, r, "Could not update MAC for NDisc: %m");
2174 }
2175
2176 if (link->lldp_rx) {
2177 r = sd_lldp_rx_set_filter_address(link->lldp_rx, &link->hw_addr.ether);
2178 if (r < 0)
2179 return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Rx: %m");
2180 }
2181
2182 if (link->lldp_tx) {
2183 r = sd_lldp_tx_set_hwaddr(link->lldp_tx, &link->hw_addr.ether);
2184 if (r < 0)
2185 return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Tx: %m");
2186 }
2187
2188 return 1; /* needs reconfigure */
2189 }
2190
2191 static int link_update_mtu(Link *link, sd_netlink_message *message) {
2192 uint32_t mtu, min_mtu = 0, max_mtu = UINT32_MAX;
2193 int r;
2194
2195 assert(link);
2196 assert(message);
2197
2198 r = sd_netlink_message_read_u32(message, IFLA_MTU, &mtu);
2199 if (r == -ENODATA)
2200 return 0;
2201 if (r < 0)
2202 return log_link_debug_errno(link, r, "rtnl: failed to read MTU in RTM_NEWLINK message: %m");
2203 if (mtu == 0)
2204 return 0;
2205
2206 r = sd_netlink_message_read_u32(message, IFLA_MIN_MTU, &min_mtu);
2207 if (r < 0 && r != -ENODATA)
2208 return log_link_debug_errno(link, r, "rtnl: failed to read minimum MTU in RTM_NEWLINK message: %m");
2209
2210 r = sd_netlink_message_read_u32(message, IFLA_MAX_MTU, &max_mtu);
2211 if (r < 0 && r != -ENODATA)
2212 return log_link_debug_errno(link, r, "rtnl: failed to read maximum MTU in RTM_NEWLINK message: %m");
2213
2214 if (max_mtu == 0)
2215 max_mtu = UINT32_MAX;
2216
2217 link->min_mtu = min_mtu;
2218 link->max_mtu = max_mtu;
2219
2220 if (link->original_mtu == 0) {
2221 link->original_mtu = mtu;
2222 log_link_debug(link, "Saved original MTU %" PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2223 link->original_mtu, link->min_mtu, link->max_mtu);
2224 }
2225
2226 if (link->mtu == mtu)
2227 return 0;
2228
2229 if (link->mtu != 0)
2230 log_link_debug(link, "MTU is changed: %"PRIu32" %s %"PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2231 link->mtu, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), mtu,
2232 link->min_mtu, link->max_mtu);
2233
2234 link->mtu = mtu;
2235
2236 if (link->dhcp_client) {
2237 r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
2238 if (r < 0)
2239 return log_link_debug_errno(link, r, "Could not update MTU in DHCP client: %m");
2240 }
2241
2242 if (link->radv) {
2243 r = sd_radv_set_mtu(link->radv, link->mtu);
2244 if (r < 0)
2245 return log_link_debug_errno(link, r, "Could not set MTU for Router Advertisement: %m");
2246 }
2247
2248 return 0;
2249 }
2250
2251 static int link_update_alternative_names(Link *link, sd_netlink_message *message) {
2252 _cleanup_strv_free_ char **altnames = NULL;
2253 int r;
2254
2255 assert(link);
2256 assert(message);
2257
2258 r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &altnames);
2259 if (r == -ENODATA)
2260 /* The message does not have IFLA_PROP_LIST container attribute. It does not mean the
2261 * interface has no alternative name. */
2262 return 0;
2263 if (r < 0)
2264 return log_link_debug_errno(link, r, "rtnl: failed to read alternative names: %m");
2265
2266 if (strv_equal(altnames, link->alternative_names))
2267 return 0;
2268
2269 STRV_FOREACH(n, link->alternative_names)
2270 hashmap_remove(link->manager->links_by_name, *n);
2271
2272 strv_free_and_replace(link->alternative_names, altnames);
2273
2274 STRV_FOREACH(n, link->alternative_names) {
2275 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, *n, link);
2276 if (r < 0)
2277 return log_link_debug_errno(link, r, "Failed to manage link by its new alternative names: %m");
2278 }
2279
2280 return 1; /* needs reconfigure */
2281 }
2282
2283 static int link_update_name(Link *link, sd_netlink_message *message) {
2284 char ifname_from_index[IF_NAMESIZE];
2285 const char *ifname;
2286 int r;
2287
2288 assert(link);
2289 assert(message);
2290
2291 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
2292 if (r == -ENODATA)
2293 /* Hmm?? But ok. */
2294 return 0;
2295 if (r < 0)
2296 return log_link_debug_errno(link, r, "Failed to read interface name in RTM_NEWLINK message: %m");
2297
2298 if (streq(ifname, link->ifname))
2299 return 0;
2300
2301 r = format_ifname(link->ifindex, ifname_from_index);
2302 if (r < 0)
2303 return log_link_debug_errno(link, r, "Could not get interface name for index %i.", link->ifindex);
2304
2305 if (!streq(ifname, ifname_from_index)) {
2306 log_link_debug(link, "New interface name '%s' received from the kernel does not correspond "
2307 "with the name currently configured on the actual interface '%s'. Ignoring.",
2308 ifname, ifname_from_index);
2309 return 0;
2310 }
2311
2312 log_link_info(link, "Interface name change detected, renamed to %s.", ifname);
2313
2314 hashmap_remove(link->manager->links_by_name, link->ifname);
2315
2316 r = free_and_strdup(&link->ifname, ifname);
2317 if (r < 0)
2318 return log_oom_debug();
2319
2320 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, link->ifname, link);
2321 if (r < 0)
2322 return log_link_debug_errno(link, r, "Failed to manage link by its new name: %m");
2323
2324 if (link->dhcp_client) {
2325 r = sd_dhcp_client_set_ifname(link->dhcp_client, link->ifname);
2326 if (r < 0)
2327 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP client: %m");
2328 }
2329
2330 if (link->dhcp6_client) {
2331 r = sd_dhcp6_client_set_ifname(link->dhcp6_client, link->ifname);
2332 if (r < 0)
2333 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP6 client: %m");
2334 }
2335
2336 if (link->ndisc) {
2337 r = sd_ndisc_set_ifname(link->ndisc, link->ifname);
2338 if (r < 0)
2339 return log_link_debug_errno(link, r, "Failed to update interface name in NDisc: %m");
2340 }
2341
2342 if (link->dhcp_server) {
2343 r = sd_dhcp_server_set_ifname(link->dhcp_server, link->ifname);
2344 if (r < 0)
2345 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP server: %m");
2346 }
2347
2348 if (link->radv) {
2349 r = sd_radv_set_ifname(link->radv, link->ifname);
2350 if (r < 0)
2351 return log_link_debug_errno(link, r, "Failed to update interface name in Router Advertisement: %m");
2352 }
2353
2354 if (link->lldp_rx) {
2355 r = sd_lldp_rx_set_ifname(link->lldp_rx, link->ifname);
2356 if (r < 0)
2357 return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Rx: %m");
2358 }
2359
2360 if (link->lldp_tx) {
2361 r = sd_lldp_tx_set_ifname(link->lldp_tx, link->ifname);
2362 if (r < 0)
2363 return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Tx: %m");
2364 }
2365
2366 if (link->ipv4ll) {
2367 r = sd_ipv4ll_set_ifname(link->ipv4ll, link->ifname);
2368 if (r < 0)
2369 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4LL client: %m");
2370 }
2371
2372 r = ipv4acd_set_ifname(link);
2373 if (r < 0)
2374 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4ACD client: %m");
2375
2376 return 1; /* needs reconfigure */
2377 }
2378
2379 static int link_update(Link *link, sd_netlink_message *message) {
2380 bool needs_reconfigure = false;
2381 int r;
2382
2383 assert(link);
2384 assert(message);
2385
2386 r = link_update_name(link, message);
2387 if (r < 0)
2388 return r;
2389 needs_reconfigure = needs_reconfigure || r > 0;
2390
2391 r = link_update_alternative_names(link, message);
2392 if (r < 0)
2393 return r;
2394 needs_reconfigure = needs_reconfigure || r > 0;
2395
2396 r = link_update_mtu(link, message);
2397 if (r < 0)
2398 return r;
2399
2400 r = link_update_driver(link, message);
2401 if (r < 0)
2402 return r;
2403 needs_reconfigure = needs_reconfigure || r > 0;
2404
2405 r = link_update_permanent_hardware_address(link, message);
2406 if (r < 0)
2407 return r;
2408 needs_reconfigure = needs_reconfigure || r > 0;
2409
2410 r = link_update_hardware_address(link, message);
2411 if (r < 0)
2412 return r;
2413 needs_reconfigure = needs_reconfigure || r > 0;
2414
2415 r = link_update_master(link, message);
2416 if (r < 0)
2417 return r;
2418
2419 r = link_update_ipv6ll_addrgen_mode(link, message);
2420 if (r < 0)
2421 return r;
2422
2423 r = link_update_flags(link, message);
2424 if (r < 0)
2425 return r;
2426
2427 return needs_reconfigure;
2428 }
2429
2430 static Link *link_drop_or_unref(Link *link) {
2431 if (!link)
2432 return NULL;
2433 if (!link->manager)
2434 return link_unref(link);
2435 return link_drop(link);
2436 }
2437
2438 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_drop_or_unref);
2439
2440 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
2441 _cleanup_free_ char *ifname = NULL, *kind = NULL, *state_file = NULL, *lease_file = NULL, *lldp_file = NULL;
2442 _cleanup_(link_drop_or_unrefp) Link *link = NULL;
2443 unsigned short iftype;
2444 int r, ifindex;
2445
2446 assert(manager);
2447 assert(message);
2448 assert(ret);
2449
2450 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2451 if (r < 0)
2452 return log_debug_errno(r, "rtnl: failed to read ifindex from link message: %m");
2453 else if (ifindex <= 0)
2454 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "rtnl: received link message without valid ifindex.");
2455
2456 r = sd_rtnl_message_link_get_type(message, &iftype);
2457 if (r < 0)
2458 return log_debug_errno(r, "rtnl: failed to read interface type from link message: %m");
2459
2460 r = sd_netlink_message_read_string_strdup(message, IFLA_IFNAME, &ifname);
2461 if (r < 0)
2462 return log_debug_errno(r, "rtnl: failed to read interface name from link message: %m");
2463
2464 /* check for link kind */
2465 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
2466 if (r >= 0) {
2467 r = sd_netlink_message_read_string_strdup(message, IFLA_INFO_KIND, &kind);
2468 if (r < 0 && r != -ENODATA)
2469 return log_debug_errno(r, "rtnl: failed to read interface kind from link message: %m");
2470 r = sd_netlink_message_exit_container(message);
2471 if (r < 0)
2472 return log_debug_errno(r, "rtnl: failed to exit IFLA_LINKINFO container: %m");
2473 }
2474
2475 if (!manager->test_mode) {
2476 /* Do not update state files when running in test mode. */
2477 if (asprintf(&state_file, "/run/systemd/netif/links/%d", ifindex) < 0)
2478 return log_oom_debug();
2479
2480 if (asprintf(&lease_file, "/run/systemd/netif/leases/%d", ifindex) < 0)
2481 return log_oom_debug();
2482
2483 if (asprintf(&lldp_file, "/run/systemd/netif/lldp/%d", ifindex) < 0)
2484 return log_oom_debug();
2485 }
2486
2487 link = new(Link, 1);
2488 if (!link)
2489 return -ENOMEM;
2490
2491 *link = (Link) {
2492 .n_ref = 1,
2493 .state = LINK_STATE_PENDING,
2494 .online_state = _LINK_ONLINE_STATE_INVALID,
2495 .ifindex = ifindex,
2496 .iftype = iftype,
2497 .ifname = TAKE_PTR(ifname),
2498 .kind = TAKE_PTR(kind),
2499
2500 .ipv6ll_address_gen_mode = _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_INVALID,
2501
2502 .state_file = TAKE_PTR(state_file),
2503 .lease_file = TAKE_PTR(lease_file),
2504 .lldp_file = TAKE_PTR(lldp_file),
2505
2506 .n_dns = UINT_MAX,
2507 .dns_default_route = -1,
2508 .llmnr = _RESOLVE_SUPPORT_INVALID,
2509 .mdns = _RESOLVE_SUPPORT_INVALID,
2510 .dnssec_mode = _DNSSEC_MODE_INVALID,
2511 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
2512 };
2513
2514 r = hashmap_ensure_put(&manager->links_by_index, NULL, INT_TO_PTR(link->ifindex), link);
2515 if (r < 0)
2516 return log_link_debug_errno(link, r, "Failed to store link into manager: %m");
2517
2518 link->manager = manager;
2519
2520 r = hashmap_ensure_put(&manager->links_by_name, &string_hash_ops, link->ifname, link);
2521 if (r < 0)
2522 return log_link_debug_errno(link, r, "Failed to manage link by its interface name: %m");
2523
2524 log_link_debug(link, "Saved new link: ifindex=%i, iftype=%s(%u), kind=%s",
2525 link->ifindex, strna(arphrd_to_name(link->iftype)), link->iftype, strna(link->kind));
2526
2527 /* If contained in this set, the link is wireless and the corresponding NL80211_CMD_NEW_INTERFACE
2528 * message arrived too early. Request the wireless link information again.
2529 */
2530 if (set_remove(manager->new_wlan_ifindices, INT_TO_PTR(link->ifindex))) {
2531 r = link_get_wlan_interface(link);
2532 if (r < 0)
2533 log_link_warning_errno(link, r, "Failed to get wireless interface, ignoring: %m");
2534 }
2535
2536 *ret = TAKE_PTR(link);
2537 return 0;
2538 }
2539
2540 int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, Manager *manager) {
2541 Link *link = NULL;
2542 NetDev *netdev = NULL;
2543 uint16_t type;
2544 const char *name;
2545 int r, ifindex;
2546
2547 assert(rtnl);
2548 assert(message);
2549 assert(manager);
2550
2551 if (sd_netlink_message_is_error(message)) {
2552 r = sd_netlink_message_get_errno(message);
2553 if (r < 0)
2554 log_message_warning_errno(message, r, "rtnl: Could not receive link message, ignoring");
2555
2556 return 0;
2557 }
2558
2559 r = sd_netlink_message_get_type(message, &type);
2560 if (r < 0) {
2561 log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
2562 return 0;
2563 } else if (!IN_SET(type, RTM_NEWLINK, RTM_DELLINK)) {
2564 log_warning("rtnl: Received unexpected message type %u when processing link, ignoring.", type);
2565 return 0;
2566 }
2567
2568 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2569 if (r < 0) {
2570 log_warning_errno(r, "rtnl: Could not get ifindex from link message, ignoring: %m");
2571 return 0;
2572 } else if (ifindex <= 0) {
2573 log_warning("rtnl: received link message with invalid ifindex %d, ignoring.", ifindex);
2574 return 0;
2575 }
2576
2577 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
2578 if (r < 0) {
2579 log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
2580 return 0;
2581 }
2582
2583 (void) link_get_by_index(manager, ifindex, &link);
2584 (void) netdev_get(manager, name, &netdev);
2585
2586 switch (type) {
2587 case RTM_NEWLINK:
2588 if (netdev) {
2589 /* netdev exists, so make sure the ifindex matches */
2590 r = netdev_set_ifindex(netdev, message);
2591 if (r < 0) {
2592 log_netdev_warning_errno(netdev, r, "Could not process new link message for netdev, ignoring: %m");
2593 return 0;
2594 }
2595 }
2596
2597 if (!link) {
2598 /* link is new, so add it */
2599 r = link_new(manager, message, &link);
2600 if (r < 0) {
2601 log_warning_errno(r, "Could not process new link message: %m");
2602 return 0;
2603 }
2604
2605 r = link_update(link, message);
2606 if (r < 0) {
2607 log_link_warning_errno(link, r, "Could not process link message: %m");
2608 link_enter_failed(link);
2609 return 0;
2610 }
2611
2612 r = link_check_initialized(link);
2613 if (r < 0) {
2614 log_link_warning_errno(link, r, "Failed to check link is initialized: %m");
2615 link_enter_failed(link);
2616 return 0;
2617 }
2618 } else {
2619 r = link_update(link, message);
2620 if (r < 0) {
2621 log_link_warning_errno(link, r, "Could not process link message: %m");
2622 link_enter_failed(link);
2623 return 0;
2624 }
2625 if (r > 0) {
2626 r = link_reconfigure_impl(link, /* force = */ false);
2627 if (r < 0) {
2628 log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
2629 link_enter_failed(link);
2630 return 0;
2631 }
2632 }
2633 }
2634 break;
2635
2636 case RTM_DELLINK:
2637 link_drop(link);
2638 netdev_drop(netdev);
2639 break;
2640
2641 default:
2642 assert_not_reached();
2643 }
2644
2645 return 1;
2646 }
2647
2648 int link_getlink_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, const char *error_msg) {
2649 uint16_t message_type;
2650 int r;
2651
2652 assert(m);
2653 assert(link);
2654 assert(error_msg);
2655
2656 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2657 return 0;
2658
2659 r = sd_netlink_message_get_errno(m);
2660 if (r < 0) {
2661 log_link_message_warning_errno(link, m, r, error_msg);
2662 link_enter_failed(link);
2663 return 0;
2664 }
2665
2666 r = sd_netlink_message_get_type(m, &message_type);
2667 if (r < 0) {
2668 log_link_debug_errno(link, r, "rtnl: failed to read link message type, ignoring: %m");
2669 return 0;
2670 }
2671 if (message_type != RTM_NEWLINK) {
2672 log_link_debug(link, "rtnl: received invalid link message type, ignoring.");
2673 return 0;
2674 }
2675
2676 r = link_update(link, m);
2677 if (r < 0) {
2678 link_enter_failed(link);
2679 return 0;
2680 }
2681
2682 return 1;
2683 }
2684
2685 int link_call_getlink(Link *link, link_netlink_message_handler_t callback) {
2686 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2687 int r;
2688
2689 assert(link);
2690 assert(link->manager);
2691 assert(link->manager->rtnl);
2692 assert(callback);
2693
2694 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
2695 if (r < 0)
2696 return r;
2697
2698 r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
2699 link_netlink_destroy_callback, link);
2700 if (r < 0)
2701 return r;
2702
2703 link_ref(link);
2704 return 0;
2705 }
2706
2707 static const char* const link_state_table[_LINK_STATE_MAX] = {
2708 [LINK_STATE_PENDING] = "pending",
2709 [LINK_STATE_INITIALIZED] = "initialized",
2710 [LINK_STATE_CONFIGURING] = "configuring",
2711 [LINK_STATE_CONFIGURED] = "configured",
2712 [LINK_STATE_UNMANAGED] = "unmanaged",
2713 [LINK_STATE_FAILED] = "failed",
2714 [LINK_STATE_LINGER] = "linger",
2715 };
2716
2717 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
2718
2719 int link_flags_to_string_alloc(uint32_t flags, char **ret) {
2720 _cleanup_free_ char *str = NULL;
2721 static const char* map[] = {
2722 [LOG2U(IFF_UP)] = "up", /* interface is up. */
2723 [LOG2U(IFF_BROADCAST)] = "broadcast", /* broadcast address valid. */
2724 [LOG2U(IFF_DEBUG)] = "debug", /* turn on debugging. */
2725 [LOG2U(IFF_LOOPBACK)] = "loopback", /* interface is a loopback net. */
2726 [LOG2U(IFF_POINTOPOINT)] = "point-to-point", /* interface has p-p link. */
2727 [LOG2U(IFF_NOTRAILERS)] = "no-trailers", /* avoid use of trailers. */
2728 [LOG2U(IFF_RUNNING)] = "running", /* interface RFC2863 OPER_UP. */
2729 [LOG2U(IFF_NOARP)] = "no-arp", /* no ARP protocol. */
2730 [LOG2U(IFF_PROMISC)] = "promiscuous", /* receive all packets. */
2731 [LOG2U(IFF_ALLMULTI)] = "all-multicast", /* receive all multicast packets. */
2732 [LOG2U(IFF_MASTER)] = "master", /* master of a load balancer. */
2733 [LOG2U(IFF_SLAVE)] = "slave", /* slave of a load balancer. */
2734 [LOG2U(IFF_MULTICAST)] = "multicast", /* supports multicast. */
2735 [LOG2U(IFF_PORTSEL)] = "portsel", /* can set media type. */
2736 [LOG2U(IFF_AUTOMEDIA)] = "auto-media", /* auto media select active. */
2737 [LOG2U(IFF_DYNAMIC)] = "dynamic", /* dialup device with changing addresses. */
2738 [LOG2U(IFF_LOWER_UP)] = "lower-up", /* driver signals L1 up. */
2739 [LOG2U(IFF_DORMANT)] = "dormant", /* driver signals dormant. */
2740 [LOG2U(IFF_ECHO)] = "echo", /* echo sent packets. */
2741 };
2742
2743 assert(ret);
2744
2745 for (size_t i = 0; i < ELEMENTSOF(map); i++)
2746 if (FLAGS_SET(flags, 1 << i) && map[i])
2747 if (!strextend_with_separator(&str, ",", map[i]))
2748 return -ENOMEM;
2749
2750 *ret = TAKE_PTR(str);
2751 return 0;
2752 }
2753
2754 static const char * const kernel_operstate_table[] = {
2755 [IF_OPER_UNKNOWN] = "unknown",
2756 [IF_OPER_NOTPRESENT] = "not-present",
2757 [IF_OPER_DOWN] = "down",
2758 [IF_OPER_LOWERLAYERDOWN] = "lower-layer-down",
2759 [IF_OPER_TESTING] = "testing",
2760 [IF_OPER_DORMANT] = "dormant",
2761 [IF_OPER_UP] = "up",
2762 };
2763
2764 DEFINE_STRING_TABLE_LOOKUP_TO_STRING(kernel_operstate, int);
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