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Merge pull request #30962 from poettering/varlink-json-sensitive-rework
[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 bool link_ipv6_enabled(Link *link) {
75 assert(link);
76
77 if (!socket_ipv6_is_supported())
78 return false;
79
80 if (link->iftype == ARPHRD_CAN)
81 return false;
82
83 if (!link->network)
84 return false;
85
86 if (link->network->bond)
87 return false;
88
89 if (link_may_have_ipv6ll(link, /* check_multicast = */ false))
90 return true;
91
92 if (network_has_static_ipv6_configurations(link->network))
93 return true;
94
95 return false;
96 }
97
98 bool link_has_ipv6_connectivity(Link *link) {
99 LinkAddressState ipv6_address_state;
100
101 assert(link);
102
103 link_get_address_states(link, NULL, &ipv6_address_state, NULL);
104
105 switch (ipv6_address_state) {
106 case LINK_ADDRESS_STATE_ROUTABLE:
107 /* If the interface has a routable IPv6 address, then we assume yes. */
108 return true;
109
110 case LINK_ADDRESS_STATE_DEGRADED:
111 /* If the interface has only degraded IPv6 address (mostly, link-local address), then let's check
112 * there is an IPv6 default gateway. */
113 return link_has_default_gateway(link, AF_INET6);
114
115 case LINK_ADDRESS_STATE_OFF:
116 /* No IPv6 address. */
117 return false;
118
119 default:
120 assert_not_reached();
121 }
122 }
123
124 static bool link_is_ready_to_configure_one(Link *link, bool allow_unmanaged) {
125 assert(link);
126
127 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED, LINK_STATE_UNMANAGED))
128 return false;
129
130 if (!link->network)
131 return allow_unmanaged;
132
133 if (!link->network->configure_without_carrier) {
134 if (link->set_flags_messages > 0)
135 return false;
136
137 if (!link_has_carrier(link))
138 return false;
139 }
140
141 if (link->set_link_messages > 0)
142 return false;
143
144 if (!link->activated)
145 return false;
146
147 return true;
148 }
149
150 bool link_is_ready_to_configure(Link *link, bool allow_unmanaged) {
151 return check_ready_for_all_sr_iov_ports(link, allow_unmanaged, link_is_ready_to_configure_one);
152 }
153
154 void link_ntp_settings_clear(Link *link) {
155 link->ntp = strv_free(link->ntp);
156 }
157
158 void link_dns_settings_clear(Link *link) {
159 if (link->n_dns != UINT_MAX)
160 for (unsigned i = 0; i < link->n_dns; i++)
161 in_addr_full_free(link->dns[i]);
162 link->dns = mfree(link->dns);
163 link->n_dns = UINT_MAX;
164
165 link->search_domains = ordered_set_free(link->search_domains);
166 link->route_domains = ordered_set_free(link->route_domains);
167
168 link->dns_default_route = -1;
169 link->llmnr = _RESOLVE_SUPPORT_INVALID;
170 link->mdns = _RESOLVE_SUPPORT_INVALID;
171 link->dnssec_mode = _DNSSEC_MODE_INVALID;
172 link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
173
174 link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
175 }
176
177 static void link_free_engines(Link *link) {
178 if (!link)
179 return;
180
181 link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
182
183 link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client);
184 link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
185 link->dhcp4_6rd_tunnel_name = mfree(link->dhcp4_6rd_tunnel_name);
186
187 link->lldp_rx = sd_lldp_rx_unref(link->lldp_rx);
188 link->lldp_tx = sd_lldp_tx_unref(link->lldp_tx);
189
190 link->ipv4acd_by_address = hashmap_free(link->ipv4acd_by_address);
191
192 link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
193
194 link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
195 link->dhcp6_lease = sd_dhcp6_lease_unref(link->dhcp6_lease);
196
197 link->ndisc = sd_ndisc_unref(link->ndisc);
198 link->ndisc_expire = sd_event_source_disable_unref(link->ndisc_expire);
199 ndisc_flush(link);
200
201 link->radv = sd_radv_unref(link->radv);
202 }
203
204 static Link *link_free(Link *link) {
205 assert(link);
206
207 link_ntp_settings_clear(link);
208 link_dns_settings_clear(link);
209
210 link->routes = set_free(link->routes);
211 link->neighbors = set_free(link->neighbors);
212 link->addresses = set_free(link->addresses);
213 link->qdiscs = set_free(link->qdiscs);
214 link->tclasses = set_free(link->tclasses);
215
216 link->dhcp_pd_prefixes = set_free(link->dhcp_pd_prefixes);
217
218 link_free_engines(link);
219
220 set_free(link->sr_iov_virt_port_ifindices);
221 free(link->ifname);
222 strv_free(link->alternative_names);
223 free(link->kind);
224 free(link->ssid);
225 free(link->previous_ssid);
226 free(link->driver);
227
228 unlink_and_free(link->lease_file);
229 unlink_and_free(link->lldp_file);
230 unlink_and_free(link->state_file);
231
232 sd_device_unref(link->dev);
233 netdev_unref(link->netdev);
234
235 hashmap_free(link->bound_to_links);
236 hashmap_free(link->bound_by_links);
237
238 set_free_with_destructor(link->slaves, link_unref);
239
240 network_unref(link->network);
241
242 sd_event_source_disable_unref(link->carrier_lost_timer);
243
244 return mfree(link);
245 }
246
247 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
248
249 int link_get_by_index(Manager *m, int ifindex, Link **ret) {
250 Link *link;
251
252 assert(m);
253
254 if (ifindex <= 0)
255 return -EINVAL;
256
257 link = hashmap_get(m->links_by_index, INT_TO_PTR(ifindex));
258 if (!link)
259 return -ENODEV;
260
261 if (ret)
262 *ret = link;
263 return 0;
264 }
265
266 int link_get_by_name(Manager *m, const char *ifname, Link **ret) {
267 Link *link;
268
269 assert(m);
270 assert(ifname);
271
272 link = hashmap_get(m->links_by_name, ifname);
273 if (!link)
274 return -ENODEV;
275
276 if (ret)
277 *ret = link;
278 return 0;
279 }
280
281 int link_get_by_hw_addr(Manager *m, const struct hw_addr_data *hw_addr, Link **ret) {
282 Link *link;
283
284 assert(m);
285 assert(hw_addr);
286
287 link = hashmap_get(m->links_by_hw_addr, hw_addr);
288 if (!link)
289 return -ENODEV;
290
291 if (ret)
292 *ret = link;
293 return 0;
294 }
295
296 int link_get_master(Link *link, Link **ret) {
297 assert(link);
298 assert(link->manager);
299 assert(ret);
300
301 if (link->master_ifindex <= 0 || link->master_ifindex == link->ifindex)
302 return -ENODEV;
303
304 return link_get_by_index(link->manager, link->master_ifindex, ret);
305 }
306
307 void link_set_state(Link *link, LinkState state) {
308 assert(link);
309
310 if (link->state == state)
311 return;
312
313 log_link_debug(link, "State changed: %s -> %s",
314 link_state_to_string(link->state),
315 link_state_to_string(state));
316
317 link->state = state;
318
319 link_send_changed(link, "AdministrativeState", NULL);
320 link_dirty(link);
321 }
322
323 int link_stop_engines(Link *link, bool may_keep_dhcp) {
324 int r, ret = 0;
325
326 assert(link);
327 assert(link->manager);
328 assert(link->manager->event);
329
330 bool keep_dhcp = may_keep_dhcp &&
331 link->network &&
332 !link->network->dhcp_send_decline && /* IPv4 ACD for the DHCPv4 address is running. */
333 (link->manager->restarting ||
334 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
335
336 if (!keep_dhcp) {
337 r = sd_dhcp_client_stop(link->dhcp_client);
338 if (r < 0)
339 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv4 client: %m"));
340 }
341
342 r = sd_dhcp_server_stop(link->dhcp_server);
343 if (r < 0)
344 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv4 server: %m"));
345
346 r = sd_lldp_rx_stop(link->lldp_rx);
347 if (r < 0)
348 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop LLDP Rx: %m"));
349
350 r = sd_lldp_tx_stop(link->lldp_tx);
351 if (r < 0)
352 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop LLDP Tx: %m"));
353
354 r = sd_ipv4ll_stop(link->ipv4ll);
355 if (r < 0)
356 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv4 link-local: %m"));
357
358 r = ipv4acd_stop(link);
359 if (r < 0)
360 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv4 ACD client: %m"));
361
362 r = sd_dhcp6_client_stop(link->dhcp6_client);
363 if (r < 0)
364 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv6 client: %m"));
365
366 r = dhcp_pd_remove(link, /* only_marked = */ false);
367 if (r < 0)
368 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not remove DHCPv6 PD addresses and routes: %m"));
369
370 r = ndisc_stop(link);
371 if (r < 0)
372 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv6 Router Discovery: %m"));
373
374 ndisc_flush(link);
375
376 r = sd_radv_stop(link->radv);
377 if (r < 0)
378 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv6 Router Advertisement: %m"));
379
380 return ret;
381 }
382
383 void link_enter_failed(Link *link) {
384 int r;
385
386 assert(link);
387
388 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
389 return;
390
391 log_link_warning(link, "Failed");
392
393 link_set_state(link, LINK_STATE_FAILED);
394
395 if (!ratelimit_below(&link->automatic_reconfigure_ratelimit)) {
396 log_link_warning(link, "The interface entered the failed state frequently, refusing to reconfigure it automatically.");
397 goto stop;
398 }
399
400 log_link_info(link, "Trying to reconfigure the interface.");
401 r = link_reconfigure(link, /* force = */ true);
402 if (r < 0) {
403 log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
404 goto stop;
405 }
406
407 return;
408
409 stop:
410 (void) link_stop_engines(link, /* may_keep_dhcp = */ false);
411 }
412
413 void link_check_ready(Link *link) {
414 Address *a;
415
416 assert(link);
417
418 if (link->state == LINK_STATE_CONFIGURED)
419 return;
420
421 if (link->state != LINK_STATE_CONFIGURING)
422 return (void) log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state));
423
424 if (!link->network)
425 return (void) log_link_debug(link, "%s(): link is unmanaged.", __func__);
426
427 if (!link->tc_configured)
428 return (void) log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
429
430 if (link->set_link_messages > 0)
431 return (void) log_link_debug(link, "%s(): link layer is configuring.", __func__);
432
433 if (!link->activated)
434 return (void) log_link_debug(link, "%s(): link is not activated.", __func__);
435
436 if (link->iftype == ARPHRD_CAN)
437 /* let's shortcut things for CAN which doesn't need most of checks below. */
438 goto ready;
439
440 if (!link->stacked_netdevs_created)
441 return (void) log_link_debug(link, "%s(): stacked netdevs are not created.", __func__);
442
443 if (!link->static_addresses_configured)
444 return (void) log_link_debug(link, "%s(): static addresses are not configured.", __func__);
445
446 if (!link->static_address_labels_configured)
447 return (void) log_link_debug(link, "%s(): static address labels are not configured.", __func__);
448
449 if (!link->static_bridge_fdb_configured)
450 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
451
452 if (!link->static_bridge_mdb_configured)
453 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
454
455 if (!link->static_ipv6_proxy_ndp_configured)
456 return (void) log_link_debug(link, "%s(): static IPv6 proxy NDP addresses are not configured.", __func__);
457
458 if (!link->static_neighbors_configured)
459 return (void) log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
460
461 if (!link->static_nexthops_configured)
462 return (void) log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
463
464 if (!link->static_routes_configured)
465 return (void) log_link_debug(link, "%s(): static routes are not configured.", __func__);
466
467 if (!link->static_routing_policy_rules_configured)
468 return (void) log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
469
470 if (!link->sr_iov_configured)
471 return (void) log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
472
473 /* IPv6LL is assigned after the link gains its carrier. */
474 if (!link->network->configure_without_carrier &&
475 link_ipv6ll_enabled(link) &&
476 !in6_addr_is_set(&link->ipv6ll_address))
477 return (void) log_link_debug(link, "%s(): IPv6LL is not configured yet.", __func__);
478
479 /* All static addresses must be ready. */
480 bool has_static_address = false;
481 SET_FOREACH(a, link->addresses) {
482 if (a->source != NETWORK_CONFIG_SOURCE_STATIC)
483 continue;
484 if (!address_is_ready(a))
485 return (void) log_link_debug(link, "%s(): static address %s is not ready.", __func__,
486 IN_ADDR_PREFIX_TO_STRING(a->family, &a->in_addr, a->prefixlen));
487 has_static_address = true;
488 }
489
490 /* If at least one static address is requested, do not request that dynamic addressing protocols are finished. */
491 if (has_static_address)
492 goto ready;
493
494 /* If no dynamic addressing protocol enabled, assume the interface is ready.
495 * Note, ignore NDisc when ConfigureWithoutCarrier= is enabled, as IPv6AcceptRA= is enabled by default. */
496 if (!link_ipv4ll_enabled(link) && !link_dhcp4_enabled(link) &&
497 !link_dhcp6_enabled(link) && !link_dhcp_pd_is_enabled(link) &&
498 (link->network->configure_without_carrier || !link_ipv6_accept_ra_enabled(link)))
499 goto ready;
500
501 bool ipv4ll_ready =
502 link_ipv4ll_enabled(link) && link->ipv4ll_address_configured &&
503 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_IPV4LL);
504 bool dhcp4_ready =
505 link_dhcp4_enabled(link) && link->dhcp4_configured &&
506 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP4);
507 bool dhcp6_ready =
508 link_dhcp6_enabled(link) && link->dhcp6_configured &&
509 (!link->network->dhcp6_use_address ||
510 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP6));
511 bool dhcp_pd_ready =
512 link_dhcp_pd_is_enabled(link) && link->dhcp_pd_configured &&
513 (!link->network->dhcp_pd_assign ||
514 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP_PD));
515 bool ndisc_ready =
516 link_ipv6_accept_ra_enabled(link) && link->ndisc_configured &&
517 (!link->network->ipv6_accept_ra_use_autonomous_prefix ||
518 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_NDISC));
519
520 /* If the uplink for PD is self, then request the corresponding DHCP protocol is also ready. */
521 if (dhcp_pd_is_uplink(link, link, /* accept_auto = */ false)) {
522 if (link_dhcp4_enabled(link) && link->network->dhcp_use_6rd &&
523 sd_dhcp_lease_has_6rd(link->dhcp_lease)) {
524 if (!dhcp4_ready)
525 return (void) log_link_debug(link, "%s(): DHCPv4 6rd prefix is assigned, but DHCPv4 protocol is not finished yet.", __func__);
526 if (!dhcp_pd_ready)
527 return (void) log_link_debug(link, "%s(): DHCPv4 is finished, but prefix acquired by DHCPv4-6rd is not assigned yet.", __func__);
528 }
529
530 if (link_dhcp6_enabled(link) && link->network->dhcp6_use_pd_prefix &&
531 sd_dhcp6_lease_has_pd_prefix(link->dhcp6_lease)) {
532 if (!dhcp6_ready)
533 return (void) log_link_debug(link, "%s(): DHCPv6 IA_PD prefix is assigned, but DHCPv6 protocol is not finished yet.", __func__);
534 if (!dhcp_pd_ready)
535 return (void) log_link_debug(link, "%s(): DHCPv6 is finished, but prefix acquired by DHCPv6 IA_PD is not assigned yet.", __func__);
536 }
537 }
538
539 /* At least one dynamic addressing protocol is finished. */
540 if (!ipv4ll_ready && !dhcp4_ready && !dhcp6_ready && !dhcp_pd_ready && !ndisc_ready)
541 return (void) log_link_debug(link, "%s(): dynamic addressing protocols are enabled but none of them finished yet.", __func__);
542
543 log_link_debug(link, "%s(): IPv4LL:%s DHCPv4:%s DHCPv6:%s DHCP-PD:%s NDisc:%s",
544 __func__,
545 yes_no(ipv4ll_ready),
546 yes_no(dhcp4_ready),
547 yes_no(dhcp6_ready),
548 yes_no(dhcp_pd_ready),
549 yes_no(ndisc_ready));
550
551 ready:
552 link_set_state(link, LINK_STATE_CONFIGURED);
553 }
554
555 static int link_request_static_configs(Link *link) {
556 int r;
557
558 assert(link);
559 assert(link->network);
560 assert(link->state != _LINK_STATE_INVALID);
561
562 r = link_request_static_addresses(link);
563 if (r < 0)
564 return r;
565
566 r = link_request_static_address_labels(link);
567 if (r < 0)
568 return r;
569
570 r = link_request_static_bridge_fdb(link);
571 if (r < 0)
572 return r;
573
574 r = link_request_static_bridge_mdb(link);
575 if (r < 0)
576 return r;
577
578 r = link_request_static_ipv6_proxy_ndp_addresses(link);
579 if (r < 0)
580 return r;
581
582 r = link_request_static_neighbors(link);
583 if (r < 0)
584 return r;
585
586 r = link_request_static_nexthops(link, false);
587 if (r < 0)
588 return r;
589
590 r = link_request_static_routes(link, false);
591 if (r < 0)
592 return r;
593
594 r = link_request_static_routing_policy_rules(link);
595 if (r < 0)
596 return r;
597
598 return 0;
599 }
600
601 static int link_request_stacked_netdevs(Link *link) {
602 NetDev *netdev;
603 int r;
604
605 assert(link);
606
607 link->stacked_netdevs_created = false;
608
609 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) {
610 r = link_request_stacked_netdev(link, netdev);
611 if (r < 0)
612 return r;
613 }
614
615 if (link->create_stacked_netdev_messages == 0) {
616 link->stacked_netdevs_created = true;
617 link_check_ready(link);
618 }
619
620 return 0;
621 }
622
623 static int link_acquire_dynamic_ipv6_conf(Link *link) {
624 int r;
625
626 assert(link);
627
628 r = radv_start(link);
629 if (r < 0)
630 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Advertisement engine: %m");
631
632 r = ndisc_start(link);
633 if (r < 0)
634 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Discovery: %m");
635
636 r = dhcp6_start(link);
637 if (r < 0)
638 return log_link_warning_errno(link, r, "Failed to start DHCPv6 client: %m");
639
640 return 0;
641 }
642
643 static int link_acquire_dynamic_ipv4_conf(Link *link) {
644 int r;
645
646 assert(link);
647 assert(link->manager);
648 assert(link->manager->event);
649
650 if (link->dhcp_client) {
651 r = dhcp4_start(link);
652 if (r < 0)
653 return log_link_warning_errno(link, r, "Failed to start DHCPv4 client: %m");
654
655 log_link_debug(link, "Acquiring DHCPv4 lease.");
656
657 } else if (link->ipv4ll) {
658 if (in4_addr_is_set(&link->network->ipv4ll_start_address)) {
659 r = sd_ipv4ll_set_address(link->ipv4ll, &link->network->ipv4ll_start_address);
660 if (r < 0)
661 return log_link_warning_errno(link, r, "Could not set IPv4 link-local start address: %m");
662 }
663
664 r = sd_ipv4ll_start(link->ipv4ll);
665 if (r < 0)
666 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
667
668 log_link_debug(link, "Acquiring IPv4 link-local address.");
669 }
670
671 if (link->dhcp_server) {
672 r = sd_dhcp_server_start(link->dhcp_server);
673 if (r < 0)
674 return log_link_warning_errno(link, r, "Could not start DHCP server: %m");
675 }
676
677 r = ipv4acd_start(link);
678 if (r < 0)
679 return log_link_warning_errno(link, r, "Could not start IPv4 ACD client: %m");
680
681 return 0;
682 }
683
684 static int link_acquire_dynamic_conf(Link *link) {
685 int r;
686
687 assert(link);
688 assert(link->network);
689
690 r = link_acquire_dynamic_ipv4_conf(link);
691 if (r < 0)
692 return r;
693
694 if (in6_addr_is_set(&link->ipv6ll_address)) {
695 r = link_acquire_dynamic_ipv6_conf(link);
696 if (r < 0)
697 return r;
698 }
699
700 if (!link_radv_enabled(link) || !link->network->dhcp_pd_announce) {
701 /* DHCPv6PD downstream does not require IPv6LL address. But may require RADV to be
702 * configured, and RADV may not be configured yet here. Only acquire subnet prefix when
703 * RADV is disabled, or the announcement of the prefix is disabled. Otherwise, the
704 * below will be called in radv_start(). */
705 r = dhcp_request_prefix_delegation(link);
706 if (r < 0)
707 return log_link_warning_errno(link, r, "Failed to request DHCP delegated subnet prefix: %m");
708 }
709
710 if (link->lldp_tx) {
711 r = sd_lldp_tx_start(link->lldp_tx);
712 if (r < 0)
713 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
714 }
715
716 if (link->lldp_rx) {
717 r = sd_lldp_rx_start(link->lldp_rx);
718 if (r < 0)
719 return log_link_warning_errno(link, r, "Failed to start LLDP client: %m");
720 }
721
722 return 0;
723 }
724
725 int link_ipv6ll_gained(Link *link) {
726 int r;
727
728 assert(link);
729
730 log_link_info(link, "Gained IPv6LL");
731
732 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
733 return 0;
734
735 r = link_acquire_dynamic_ipv6_conf(link);
736 if (r < 0)
737 return r;
738
739 link_check_ready(link);
740 return 0;
741 }
742
743 int link_handle_bound_to_list(Link *link) {
744 bool required_up = false;
745 bool link_is_up = false;
746 Link *l;
747
748 assert(link);
749
750 /* If at least one interface in bound_to_links has carrier, then make this interface up.
751 * If all interfaces in bound_to_links do not, then make this interface down. */
752
753 if (hashmap_isempty(link->bound_to_links))
754 return 0;
755
756 if (link->flags & IFF_UP)
757 link_is_up = true;
758
759 HASHMAP_FOREACH(l, link->bound_to_links)
760 if (link_has_carrier(l)) {
761 required_up = true;
762 break;
763 }
764
765 if (!required_up && link_is_up)
766 return link_request_to_bring_up_or_down(link, /* up = */ false);
767 if (required_up && !link_is_up)
768 return link_request_to_bring_up_or_down(link, /* up = */ true);
769
770 return 0;
771 }
772
773 static int link_handle_bound_by_list(Link *link) {
774 Link *l;
775 int r;
776
777 assert(link);
778
779 /* Update up or down state of interfaces which depend on this interface's carrier state. */
780
781 if (hashmap_isempty(link->bound_by_links))
782 return 0;
783
784 HASHMAP_FOREACH(l, link->bound_by_links) {
785 r = link_handle_bound_to_list(l);
786 if (r < 0)
787 return r;
788 }
789
790 return 0;
791 }
792
793 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
794 int r;
795
796 assert(link);
797 assert(carrier);
798
799 if (link == carrier)
800 return 0;
801
802 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
803 return 0;
804
805 r = hashmap_ensure_put(h, NULL, INT_TO_PTR(carrier->ifindex), carrier);
806 if (r < 0)
807 return r;
808
809 link_dirty(link);
810
811 return 0;
812 }
813
814 static int link_new_bound_by_list(Link *link) {
815 Manager *m;
816 Link *carrier;
817 int r;
818
819 assert(link);
820 assert(link->manager);
821
822 m = link->manager;
823
824 HASHMAP_FOREACH(carrier, m->links_by_index) {
825 if (!carrier->network)
826 continue;
827
828 if (strv_isempty(carrier->network->bind_carrier))
829 continue;
830
831 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
832 r = link_put_carrier(link, carrier, &link->bound_by_links);
833 if (r < 0)
834 return r;
835 }
836 }
837
838 HASHMAP_FOREACH(carrier, link->bound_by_links) {
839 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
840 if (r < 0)
841 return r;
842 }
843
844 return 0;
845 }
846
847 static int link_new_bound_to_list(Link *link) {
848 Manager *m;
849 Link *carrier;
850 int r;
851
852 assert(link);
853 assert(link->manager);
854
855 if (!link->network)
856 return 0;
857
858 if (strv_isempty(link->network->bind_carrier))
859 return 0;
860
861 m = link->manager;
862
863 HASHMAP_FOREACH(carrier, m->links_by_index) {
864 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
865 r = link_put_carrier(link, carrier, &link->bound_to_links);
866 if (r < 0)
867 return r;
868 }
869 }
870
871 HASHMAP_FOREACH(carrier, link->bound_to_links) {
872 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
873 if (r < 0)
874 return r;
875 }
876
877 return 0;
878 }
879
880 static void link_free_bound_to_list(Link *link) {
881 bool updated = false;
882 Link *bound_to;
883
884 assert(link);
885
886 while ((bound_to = hashmap_steal_first(link->bound_to_links))) {
887 updated = true;
888
889 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
890 link_dirty(bound_to);
891 }
892
893 if (updated)
894 link_dirty(link);
895 }
896
897 static void link_free_bound_by_list(Link *link) {
898 bool updated = false;
899 Link *bound_by;
900
901 assert(link);
902
903 while ((bound_by = hashmap_steal_first(link->bound_by_links))) {
904 updated = true;
905
906 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
907 link_dirty(bound_by);
908 link_handle_bound_to_list(bound_by);
909 }
910 }
911
912 if (updated)
913 link_dirty(link);
914 }
915
916 static int link_append_to_master(Link *link) {
917 Link *master;
918 int r;
919
920 assert(link);
921
922 /* - The link may have no master.
923 * - RTM_NEWLINK message about master interface may not be received yet. */
924 if (link_get_master(link, &master) < 0)
925 return 0;
926
927 r = set_ensure_put(&master->slaves, NULL, link);
928 if (r <= 0)
929 return r;
930
931 link_ref(link);
932 return 0;
933 }
934
935 static void link_drop_from_master(Link *link) {
936 Link *master;
937
938 assert(link);
939
940 if (!link->manager)
941 return;
942
943 if (link_get_master(link, &master) < 0)
944 return;
945
946 link_unref(set_remove(master->slaves, link));
947 }
948
949 static int link_drop_requests(Link *link) {
950 Request *req;
951 int ret = 0;
952
953 assert(link);
954 assert(link->manager);
955
956 ORDERED_SET_FOREACH(req, link->manager->request_queue) {
957 if (req->link != link)
958 continue;
959
960 /* If the request is already called, but its reply is not received, then we need to
961 * drop the configuration (e.g. address) here. Note, if the configuration is known,
962 * it will be handled later by link_drop_foreign_addresses() or so. */
963 if (req->waiting_reply && link->state != LINK_STATE_LINGER)
964 switch (req->type) {
965 case REQUEST_TYPE_ADDRESS: {
966 Address *address = ASSERT_PTR(req->userdata);
967
968 if (address_get(link, address, NULL) < 0)
969 RET_GATHER(ret, address_remove(address, link));
970 break;
971 }
972 case REQUEST_TYPE_NEIGHBOR: {
973 Neighbor *neighbor = ASSERT_PTR(req->userdata);
974
975 if (neighbor_get(link, neighbor, NULL) < 0)
976 RET_GATHER(ret, neighbor_remove(neighbor, link));
977 break;
978 }
979 case REQUEST_TYPE_NEXTHOP: {
980 NextHop *nexthop = ASSERT_PTR(req->userdata);
981
982 if (nexthop_get_by_id(link->manager, nexthop->id, NULL) < 0)
983 RET_GATHER(ret, nexthop_remove(nexthop, link->manager));
984 break;
985 }
986 default:
987 ;
988 }
989
990 request_detach(req);
991 }
992
993 return ret;
994 }
995
996 static Link *link_drop(Link *link) {
997 if (!link)
998 return NULL;
999
1000 assert(link->manager);
1001
1002 link_set_state(link, LINK_STATE_LINGER);
1003
1004 /* Drop all references from other links and manager. Note that async netlink calls may have
1005 * references to the link, and they will be dropped when we receive replies. */
1006
1007 (void) link_drop_requests(link);
1008
1009 link_free_bound_to_list(link);
1010 link_free_bound_by_list(link);
1011
1012 link_clear_sr_iov_ifindices(link);
1013
1014 link_drop_from_master(link);
1015
1016 if (link->state_file)
1017 (void) unlink(link->state_file);
1018
1019 link_clean(link);
1020
1021 STRV_FOREACH(n, link->alternative_names)
1022 hashmap_remove(link->manager->links_by_name, *n);
1023 hashmap_remove(link->manager->links_by_name, link->ifname);
1024
1025 /* bonding master and its slaves have the same hardware address. */
1026 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
1027
1028 /* The following must be called at last. */
1029 assert_se(hashmap_remove(link->manager->links_by_index, INT_TO_PTR(link->ifindex)) == link);
1030 return link_unref(link);
1031 }
1032
1033 static int link_drop_foreign_config(Link *link) {
1034 int r;
1035
1036 assert(link);
1037 assert(link->manager);
1038
1039 /* Drop foreign config, but ignore unmanaged, loopback, or critical interfaces. We do not want
1040 * to remove loopback address or addresses used for root NFS. */
1041
1042 if (IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
1043 return 0;
1044 if (FLAGS_SET(link->flags, IFF_LOOPBACK))
1045 return 0;
1046 if (link->network->keep_configuration == KEEP_CONFIGURATION_YES)
1047 return 0;
1048
1049 r = link_drop_foreign_routes(link);
1050
1051 RET_GATHER(r, link_drop_foreign_nexthops(link));
1052 RET_GATHER(r, link_drop_foreign_addresses(link));
1053 RET_GATHER(r, link_drop_foreign_neighbors(link));
1054 RET_GATHER(r, manager_drop_foreign_routing_policy_rules(link->manager));
1055
1056 return r;
1057 }
1058
1059 static int link_drop_managed_config(Link *link) {
1060 int r;
1061
1062 assert(link);
1063 assert(link->manager);
1064
1065 r = link_drop_managed_routes(link);
1066
1067 RET_GATHER(r, link_drop_managed_nexthops(link));
1068 RET_GATHER(r, link_drop_managed_addresses(link));
1069 RET_GATHER(r, link_drop_managed_neighbors(link));
1070 RET_GATHER(r, link_drop_managed_routing_policy_rules(link));
1071
1072 return r;
1073 }
1074
1075 static void link_foreignize_config(Link *link) {
1076 assert(link);
1077 assert(link->manager);
1078
1079 link_foreignize_routes(link);
1080 link_foreignize_nexthops(link);
1081 link_foreignize_addresses(link);
1082 link_foreignize_neighbors(link);
1083 link_foreignize_routing_policy_rules(link);
1084 }
1085
1086 static int link_configure(Link *link) {
1087 int r;
1088
1089 assert(link);
1090 assert(link->network);
1091 assert(link->state == LINK_STATE_INITIALIZED);
1092
1093 link_set_state(link, LINK_STATE_CONFIGURING);
1094
1095 r = link_new_bound_to_list(link);
1096 if (r < 0)
1097 return r;
1098
1099 r = link_request_traffic_control(link);
1100 if (r < 0)
1101 return r;
1102
1103 r = link_configure_mtu(link);
1104 if (r < 0)
1105 return r;
1106
1107 if (link->iftype == ARPHRD_CAN) {
1108 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1109 r = link_request_to_set_can(link);
1110 if (r < 0)
1111 return r;
1112
1113 return link_request_to_activate(link);
1114 }
1115
1116 r = link_request_sr_iov_vfs(link);
1117 if (r < 0)
1118 return r;
1119
1120 r = link_set_sysctl(link);
1121 if (r < 0)
1122 return r;
1123
1124 r = link_request_to_set_mac(link, /* allow_retry = */ true);
1125 if (r < 0)
1126 return r;
1127
1128 r = link_request_to_set_ipoib(link);
1129 if (r < 0)
1130 return r;
1131
1132 r = link_request_to_set_flags(link);
1133 if (r < 0)
1134 return r;
1135
1136 r = link_request_to_set_group(link);
1137 if (r < 0)
1138 return r;
1139
1140 r = link_request_to_set_addrgen_mode(link);
1141 if (r < 0)
1142 return r;
1143
1144 r = link_request_to_set_master(link);
1145 if (r < 0)
1146 return r;
1147
1148 r = link_request_stacked_netdevs(link);
1149 if (r < 0)
1150 return r;
1151
1152 r = link_request_to_set_bond(link);
1153 if (r < 0)
1154 return r;
1155
1156 r = link_request_to_set_bridge(link);
1157 if (r < 0)
1158 return r;
1159
1160 r = link_request_to_set_bridge_vlan(link);
1161 if (r < 0)
1162 return r;
1163
1164 r = link_request_to_activate(link);
1165 if (r < 0)
1166 return r;
1167
1168 r = ipv4ll_configure(link);
1169 if (r < 0)
1170 return r;
1171
1172 r = link_request_dhcp4_client(link);
1173 if (r < 0)
1174 return r;
1175
1176 r = link_request_dhcp6_client(link);
1177 if (r < 0)
1178 return r;
1179
1180 r = link_request_ndisc(link);
1181 if (r < 0)
1182 return r;
1183
1184 r = link_request_dhcp_server(link);
1185 if (r < 0)
1186 return r;
1187
1188 r = link_request_radv(link);
1189 if (r < 0)
1190 return r;
1191
1192 r = link_lldp_rx_configure(link);
1193 if (r < 0)
1194 return r;
1195
1196 r = link_lldp_tx_configure(link);
1197 if (r < 0)
1198 return r;
1199
1200 r = link_drop_foreign_config(link);
1201 if (r < 0)
1202 return r;
1203
1204 r = link_request_static_configs(link);
1205 if (r < 0)
1206 return r;
1207
1208 if (!link_has_carrier(link))
1209 return 0;
1210
1211 return link_acquire_dynamic_conf(link);
1212 }
1213
1214 static int link_get_network(Link *link, Network **ret) {
1215 Network *network;
1216 int r;
1217
1218 assert(link);
1219 assert(link->manager);
1220 assert(ret);
1221
1222 ORDERED_HASHMAP_FOREACH(network, link->manager->networks) {
1223 bool warn = false;
1224
1225 r = net_match_config(
1226 &network->match,
1227 link->dev,
1228 &link->hw_addr,
1229 &link->permanent_hw_addr,
1230 link->driver,
1231 link->iftype,
1232 link->kind,
1233 link->ifname,
1234 link->alternative_names,
1235 link->wlan_iftype,
1236 link->ssid,
1237 &link->bssid);
1238 if (r < 0)
1239 return r;
1240 if (r == 0)
1241 continue;
1242
1243 if (network->match.ifname && link->dev) {
1244 uint8_t name_assign_type = NET_NAME_UNKNOWN;
1245 const char *attr;
1246
1247 if (sd_device_get_sysattr_value(link->dev, "name_assign_type", &attr) >= 0)
1248 (void) safe_atou8(attr, &name_assign_type);
1249
1250 warn = name_assign_type == NET_NAME_ENUM;
1251 }
1252
1253 log_link_full(link, warn ? LOG_WARNING : LOG_DEBUG,
1254 "found matching network '%s'%s.",
1255 network->filename,
1256 warn ? ", based on potentially unpredictable interface name" : "");
1257
1258 if (network->unmanaged)
1259 return -ENOENT;
1260
1261 *ret = network;
1262 return 0;
1263 }
1264
1265 return -ENOENT;
1266 }
1267
1268 int link_reconfigure_impl(Link *link, bool force) {
1269 Network *network = NULL;
1270 NetDev *netdev = NULL;
1271 int r;
1272
1273 assert(link);
1274
1275 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
1276 return 0;
1277
1278 r = netdev_get(link->manager, link->ifname, &netdev);
1279 if (r < 0 && r != -ENOENT)
1280 return r;
1281
1282 r = link_get_network(link, &network);
1283 if (r < 0 && r != -ENOENT)
1284 return r;
1285
1286 if (link->state != LINK_STATE_UNMANAGED && !network)
1287 /* If link is in initialized state, then link->network is also NULL. */
1288 force = true;
1289
1290 if (link->network == network && !force)
1291 return 0;
1292
1293 if (network) {
1294 _cleanup_free_ char *joined = strv_join(network->dropins, ", ");
1295
1296 if (link->state == LINK_STATE_INITIALIZED)
1297 log_link_info(link, "Configuring with %s%s%s%s.",
1298 network->filename,
1299 isempty(joined) ? "" : " (dropins: ",
1300 joined,
1301 isempty(joined) ? "" : ")");
1302 else
1303 log_link_info(link, "Reconfiguring with %s%s%s%s.",
1304 network->filename,
1305 isempty(joined) ? "" : " (dropins: ",
1306 joined,
1307 isempty(joined) ? "" : ")");
1308 } else
1309 log_link_full(link, link->state == LINK_STATE_INITIALIZED ? LOG_DEBUG : LOG_INFO,
1310 "Unmanaging interface.");
1311
1312 /* Dropping old .network file */
1313 r = link_stop_engines(link, false);
1314 if (r < 0)
1315 return r;
1316
1317 r = link_drop_requests(link);
1318 if (r < 0)
1319 return r;
1320
1321 if (network && !force && network->keep_configuration != KEEP_CONFIGURATION_YES)
1322 /* When a new/updated .network file is assigned, first make all configs (addresses,
1323 * routes, and so on) foreign, and then drop unnecessary configs later by
1324 * link_drop_foreign_config() in link_configure().
1325 * Note, when KeepConfiguration=yes, link_drop_foreign_config() does nothing. Hence,
1326 * here we need to drop the configs such as addresses, routes, and so on configured by
1327 * the previously assigned .network file. */
1328 link_foreignize_config(link);
1329 else {
1330 /* Remove all managed configs. Note, foreign configs are removed in later by
1331 * link_configure() -> link_drop_foreign_config() if the link is managed by us. */
1332 r = link_drop_managed_config(link);
1333 if (r < 0)
1334 return r;
1335 }
1336
1337 /* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the
1338 * bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will
1339 * not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the
1340 * map here, as it depends on .network files assigned to other links. */
1341 link_free_bound_to_list(link);
1342
1343 link_free_engines(link);
1344 link->network = network_unref(link->network);
1345
1346 netdev_unref(link->netdev);
1347 link->netdev = netdev_ref(netdev);
1348
1349 if (!network) {
1350 link_set_state(link, LINK_STATE_UNMANAGED);
1351 return 0;
1352 }
1353
1354 /* Then, apply new .network file */
1355 link->network = network_ref(network);
1356 link_update_operstate(link, true);
1357 link_dirty(link);
1358
1359 link_set_state(link, LINK_STATE_INITIALIZED);
1360 link->activated = false;
1361
1362 r = link_configure(link);
1363 if (r < 0)
1364 return r;
1365
1366 return 1;
1367 }
1368
1369 static int link_reconfigure_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, bool force) {
1370 int r;
1371
1372 assert(link);
1373
1374 r = link_getlink_handler_internal(rtnl, m, link, "Failed to update link state");
1375 if (r <= 0)
1376 return r;
1377
1378 r = link_reconfigure_impl(link, force);
1379 if (r < 0) {
1380 link_enter_failed(link);
1381 return 0;
1382 }
1383
1384 return r;
1385 }
1386
1387 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1388 return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ false);
1389 }
1390
1391 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1392 return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ true);
1393 }
1394
1395 int link_reconfigure(Link *link, bool force) {
1396 int r;
1397
1398 assert(link);
1399
1400 /* When link in pending or initialized state, then link_configure() will be called. To prevent
1401 * the function from being called multiple times simultaneously, refuse to reconfigure the
1402 * interface in these cases. */
1403 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
1404 return 0; /* 0 means no-op. */
1405
1406 r = link_call_getlink(link, force ? link_force_reconfigure_handler : link_reconfigure_handler);
1407 if (r < 0)
1408 return r;
1409
1410 return 1; /* 1 means the interface will be reconfigured. */
1411 }
1412
1413 static int link_initialized_and_synced(Link *link) {
1414 int r;
1415
1416 assert(link);
1417 assert(link->manager);
1418
1419 if (link->manager->test_mode) {
1420 log_link_debug(link, "Running in test mode, refusing to enter initialized state.");
1421 link_set_state(link, LINK_STATE_UNMANAGED);
1422 return 0;
1423 }
1424
1425 if (link->state == LINK_STATE_PENDING) {
1426 log_link_debug(link, "Link state is up-to-date");
1427 link_set_state(link, LINK_STATE_INITIALIZED);
1428
1429 r = link_new_bound_by_list(link);
1430 if (r < 0)
1431 return r;
1432
1433 r = link_handle_bound_by_list(link);
1434 if (r < 0)
1435 return r;
1436 }
1437
1438 return link_reconfigure_impl(link, /* force = */ false);
1439 }
1440
1441 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1442 int r;
1443
1444 r = link_getlink_handler_internal(rtnl, m, link, "Failed to wait for the interface to be initialized");
1445 if (r <= 0)
1446 return r;
1447
1448 r = link_initialized_and_synced(link);
1449 if (r < 0)
1450 link_enter_failed(link);
1451
1452 return 0;
1453 }
1454
1455 static int link_initialized(Link *link, sd_device *device) {
1456 int r;
1457
1458 assert(link);
1459 assert(device);
1460
1461 /* Always replace with the new sd_device object. As the sysname (and possibly other properties
1462 * or sysattrs) may be outdated. */
1463 device_unref_and_replace(link->dev, device);
1464
1465 if (link->dhcp_client) {
1466 r = sd_dhcp_client_attach_device(link->dhcp_client, link->dev);
1467 if (r < 0)
1468 log_link_warning_errno(link, r, "Failed to attach device to DHCPv4 client, ignoring: %m");
1469 }
1470
1471 if (link->dhcp6_client) {
1472 r = sd_dhcp6_client_attach_device(link->dhcp6_client, link->dev);
1473 if (r < 0)
1474 log_link_warning_errno(link, r, "Failed to attach device to DHCPv6 client, ignoring: %m");
1475 }
1476
1477 r = link_set_sr_iov_ifindices(link);
1478 if (r < 0)
1479 log_link_warning_errno(link, r, "Failed to manage SR-IOV PF and VF ports, ignoring: %m");
1480
1481 if (link->state != LINK_STATE_PENDING)
1482 return link_reconfigure(link, /* force = */ false);
1483
1484 log_link_debug(link, "udev initialized link");
1485
1486 /* udev has initialized the link, but we don't know if we have yet
1487 * processed the NEWLINK messages with the latest state. Do a GETLINK,
1488 * when it returns we know that the pending NEWLINKs have already been
1489 * processed and that we are up-to-date */
1490
1491 return link_call_getlink(link, link_initialized_handler);
1492 }
1493
1494 static int link_check_initialized(Link *link) {
1495 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
1496 int r;
1497
1498 assert(link);
1499
1500 if (!udev_available())
1501 return link_initialized_and_synced(link);
1502
1503 /* udev should be around */
1504 r = sd_device_new_from_ifindex(&device, link->ifindex);
1505 if (r < 0) {
1506 log_link_debug_errno(link, r, "Could not find device, waiting for device initialization: %m");
1507 return 0;
1508 }
1509
1510 r = sd_device_get_is_initialized(device);
1511 if (r < 0)
1512 return log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
1513 if (r == 0) {
1514 /* not yet ready */
1515 log_link_debug(link, "link pending udev initialization...");
1516 return 0;
1517 }
1518
1519 r = device_is_renaming(device);
1520 if (r < 0)
1521 return log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
1522 if (r > 0) {
1523 log_link_debug(link, "Interface is being renamed, pending initialization.");
1524 return 0;
1525 }
1526
1527 return link_initialized(link, device);
1528 }
1529
1530 int manager_udev_process_link(Manager *m, sd_device *device, sd_device_action_t action) {
1531 int r, ifindex;
1532 const char *s;
1533 Link *link;
1534
1535 assert(m);
1536 assert(device);
1537
1538 r = sd_device_get_ifindex(device, &ifindex);
1539 if (r < 0)
1540 return log_device_debug_errno(device, r, "Failed to get ifindex: %m");
1541
1542 r = link_get_by_index(m, ifindex, &link);
1543 if (r < 0) {
1544 /* This error is not critical, as the corresponding rtnl message may be received later. */
1545 log_device_debug_errno(device, r, "Failed to get link from ifindex %i, ignoring: %m", ifindex);
1546 return 0;
1547 }
1548
1549 /* Let's unref the sd-device object assigned to the corresponding Link object, but keep the Link
1550 * object here. It will be removed only when rtnetlink says so. */
1551 if (action == SD_DEVICE_REMOVE) {
1552 link->dev = sd_device_unref(link->dev);
1553 return 0;
1554 }
1555
1556 r = device_is_renaming(device);
1557 if (r < 0)
1558 return log_device_debug_errno(device, r, "Failed to determine if the device is renaming or not: %m");
1559 if (r > 0) {
1560 log_device_debug(device, "Device is renaming, waiting for the interface to be renamed.");
1561 /* TODO:
1562 * What happens when a device is initialized, then soon renamed after that? When we detect
1563 * such, maybe we should cancel or postpone all queued requests for the interface. */
1564 return 0;
1565 }
1566
1567 r = sd_device_get_property_value(device, "ID_NET_MANAGED_BY", &s);
1568 if (r < 0 && r != -ENOENT)
1569 log_device_debug_errno(device, r, "Failed to get ID_NET_MANAGED_BY udev property, ignoring: %m");
1570 if (r >= 0 && !streq(s, "io.systemd.Network")) {
1571 log_device_debug(device, "Interface is requested to be managed by '%s', not managing the interface.", s);
1572 link_set_state(link, LINK_STATE_UNMANAGED);
1573 return 0;
1574 }
1575
1576 r = link_initialized(link, device);
1577 if (r < 0)
1578 link_enter_failed(link);
1579
1580 return 0;
1581 }
1582
1583 static int link_carrier_gained(Link *link) {
1584 bool force_reconfigure;
1585 int r;
1586
1587 assert(link);
1588
1589 r = event_source_disable(link->carrier_lost_timer);
1590 if (r < 0)
1591 log_link_warning_errno(link, r, "Failed to disable carrier lost timer, ignoring: %m");
1592
1593 /* If a wireless interface was connected to an access point, and the SSID is changed (that is,
1594 * both previous_ssid and ssid are non-NULL), then the connected wireless network could be
1595 * changed. So, always reconfigure the link. Which means e.g. the DHCP client will be
1596 * restarted, and the correct network information will be gained.
1597 *
1598 * However, do not reconfigure the wireless interface forcibly if it was not connected to any
1599 * access points previously (previous_ssid is NULL in this case). As, a .network file may be
1600 * already assigned to the interface (in that case, the .network file does not have the SSID=
1601 * setting in the [Match] section), and the interface is already being configured. Of course,
1602 * there may exist another .network file with higher priority and a matching SSID= setting. But
1603 * in that case, link_reconfigure_impl() can handle that without the force_reconfigure flag.
1604 *
1605 * For non-wireless interfaces, we have no way to detect the connected network change. So,
1606 * setting force_reconfigure = false. Note, both ssid and previous_ssid are NULL in that case. */
1607 force_reconfigure = link->previous_ssid && !streq_ptr(link->previous_ssid, link->ssid);
1608 link->previous_ssid = mfree(link->previous_ssid);
1609
1610 /* AP and P2P-GO interfaces may have a new SSID - update the link properties in case a new .network
1611 * profile wants to match on it with SSID= in its [Match] section.
1612 */
1613 if (IN_SET(link->wlan_iftype, NL80211_IFTYPE_AP, NL80211_IFTYPE_P2P_GO)) {
1614 r = link_get_wlan_interface(link);
1615 if (r < 0)
1616 return r;
1617 }
1618
1619 /* At this stage, both wlan and link information should be up-to-date. Hence, it is not necessary to
1620 * call RTM_GETLINK, NL80211_CMD_GET_INTERFACE, or NL80211_CMD_GET_STATION commands, and simply call
1621 * link_reconfigure_impl(). Note, link_reconfigure_impl() returns 1 when the link is reconfigured. */
1622 r = link_reconfigure_impl(link, force_reconfigure);
1623 if (r != 0)
1624 return r;
1625
1626 r = link_handle_bound_by_list(link);
1627 if (r < 0)
1628 return r;
1629
1630 if (link->iftype == ARPHRD_CAN)
1631 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1632 return 0;
1633
1634 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
1635 r = link_acquire_dynamic_conf(link);
1636 if (r < 0)
1637 return r;
1638
1639 r = link_request_static_configs(link);
1640 if (r < 0)
1641 return r;
1642 }
1643
1644 return 0;
1645 }
1646
1647 static int link_carrier_lost_impl(Link *link) {
1648 int r, ret = 0;
1649
1650 assert(link);
1651
1652 link->previous_ssid = mfree(link->previous_ssid);
1653
1654 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1655 return 0;
1656
1657 if (!link->network)
1658 return 0;
1659
1660 r = link_stop_engines(link, false);
1661 if (r < 0)
1662 ret = r;
1663
1664 r = link_drop_managed_config(link);
1665 if (r < 0 && ret >= 0)
1666 ret = r;
1667
1668 return ret;
1669 }
1670
1671 static int link_carrier_lost_handler(sd_event_source *s, uint64_t usec, void *userdata) {
1672 Link *link = ASSERT_PTR(userdata);
1673 int r;
1674
1675 r = link_carrier_lost_impl(link);
1676 if (r < 0) {
1677 log_link_warning_errno(link, r, "Failed to process carrier lost event: %m");
1678 link_enter_failed(link);
1679 }
1680
1681 return 0;
1682 }
1683
1684 static int link_carrier_lost(Link *link) {
1685 uint16_t dhcp_mtu;
1686 usec_t usec;
1687 int r;
1688
1689 assert(link);
1690
1691 r = link_handle_bound_by_list(link);
1692 if (r < 0)
1693 return r;
1694
1695 if (link->iftype == ARPHRD_CAN)
1696 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1697 return 0;
1698
1699 if (!link->network)
1700 return 0;
1701
1702 if (link->network->ignore_carrier_loss_set)
1703 /* If IgnoreCarrierLoss= is explicitly specified, then use the specified value. */
1704 usec = link->network->ignore_carrier_loss_usec;
1705
1706 else if (link->network->bond && link->wlan_iftype > 0)
1707 /* Enslaving wlan interface to a bond disconnects from the connected AP, and causes its
1708 * carrier to be lost. See #19832. */
1709 usec = 3 * USEC_PER_SEC;
1710
1711 else if (link->network->dhcp_use_mtu &&
1712 link->dhcp_lease &&
1713 sd_dhcp_lease_get_mtu(link->dhcp_lease, &dhcp_mtu) >= 0 &&
1714 dhcp_mtu != link->original_mtu)
1715 /* Some drivers reset interfaces when changing MTU. Resetting interfaces by the static
1716 * MTU should not cause any issues, as MTU is changed only once. However, setting MTU
1717 * through DHCP lease causes an infinite loop of resetting the interface. See #18738. */
1718 usec = 5 * USEC_PER_SEC;
1719
1720 else
1721 /* Otherwise, use the implied default value. */
1722 usec = link->network->ignore_carrier_loss_usec;
1723
1724 if (usec == USEC_INFINITY)
1725 return 0;
1726
1727 if (usec == 0)
1728 return link_carrier_lost_impl(link);
1729
1730 return event_reset_time_relative(link->manager->event,
1731 &link->carrier_lost_timer,
1732 CLOCK_BOOTTIME,
1733 usec,
1734 0,
1735 link_carrier_lost_handler,
1736 link,
1737 0,
1738 "link-carrier-loss",
1739 true);
1740 }
1741
1742 static int link_admin_state_up(Link *link) {
1743 int r;
1744
1745 assert(link);
1746
1747 /* This is called every time an interface admin state changes to up;
1748 * specifically, when IFF_UP flag changes from unset to set. */
1749
1750 if (!link->network)
1751 return 0;
1752
1753 if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_DOWN) {
1754 log_link_info(link, "Activation policy is \"always-down\", forcing link down.");
1755 return link_request_to_bring_up_or_down(link, /* up = */ false);
1756 }
1757
1758 /* We set the ipv6 mtu after the device mtu, but the kernel resets
1759 * ipv6 mtu on NETDEV_UP, so we need to reset it. */
1760 r = link_set_ipv6_mtu(link);
1761 if (r < 0)
1762 log_link_warning_errno(link, r, "Cannot set IPv6 MTU, ignoring: %m");
1763
1764 return 0;
1765 }
1766
1767 static int link_admin_state_down(Link *link) {
1768 assert(link);
1769
1770 if (!link->network)
1771 return 0;
1772
1773 if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) {
1774 log_link_info(link, "Activation policy is \"always-up\", forcing link up.");
1775 return link_request_to_bring_up_or_down(link, /* up = */ true);
1776 }
1777
1778 return 0;
1779 }
1780
1781 static bool link_is_enslaved(Link *link) {
1782 if (link->flags & IFF_SLAVE)
1783 return true;
1784
1785 if (link->master_ifindex > 0)
1786 return true;
1787
1788 return false;
1789 }
1790
1791 void link_update_operstate(Link *link, bool also_update_master) {
1792 LinkOperationalState operstate;
1793 LinkCarrierState carrier_state;
1794 LinkAddressState ipv4_address_state, ipv6_address_state, address_state;
1795 LinkOnlineState online_state;
1796 _cleanup_strv_free_ char **p = NULL;
1797 bool changed = false;
1798
1799 assert(link);
1800
1801 if (link->kernel_operstate == IF_OPER_DORMANT)
1802 carrier_state = LINK_CARRIER_STATE_DORMANT;
1803 else if (link_has_carrier(link)) {
1804 if (link_is_enslaved(link))
1805 carrier_state = LINK_CARRIER_STATE_ENSLAVED;
1806 else
1807 carrier_state = LINK_CARRIER_STATE_CARRIER;
1808 } else if (link->flags & IFF_UP)
1809 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
1810 else
1811 carrier_state = LINK_CARRIER_STATE_OFF;
1812
1813 if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
1814 Link *slave;
1815
1816 SET_FOREACH(slave, link->slaves) {
1817 link_update_operstate(slave, false);
1818
1819 if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
1820 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
1821 }
1822 }
1823
1824 link_get_address_states(link, &ipv4_address_state, &ipv6_address_state, &address_state);
1825
1826 /* Mapping of address and carrier state vs operational state
1827 * carrier state
1828 * | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
1829 * ------------------------------------------------------------------------------
1830 * off | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
1831 * address_state degraded | off | no-carrier | dormant | degraded | degraded | enslaved
1832 * routable | off | no-carrier | dormant | routable | routable | routable
1833 */
1834
1835 if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_ROUTABLE)
1836 operstate = LINK_OPERSTATE_ROUTABLE;
1837 else if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_DEGRADED)
1838 operstate = LINK_OPERSTATE_DEGRADED;
1839 else if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
1840 operstate = (LinkOperationalState) carrier_state;
1841 else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
1842 operstate = LINK_OPERSTATE_ROUTABLE;
1843 else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
1844 operstate = LINK_OPERSTATE_DEGRADED;
1845 else
1846 operstate = LINK_OPERSTATE_ENSLAVED;
1847
1848 /* Only determine online state for managed links with RequiredForOnline=yes */
1849 if (!link->network || !link->network->required_for_online)
1850 online_state = _LINK_ONLINE_STATE_INVALID;
1851 else if (operstate < link->network->required_operstate_for_online.min ||
1852 operstate > link->network->required_operstate_for_online.max)
1853 online_state = LINK_ONLINE_STATE_OFFLINE;
1854 else {
1855 AddressFamily required_family = link->network->required_family_for_online;
1856 bool needs_ipv4 = required_family & ADDRESS_FAMILY_IPV4;
1857 bool needs_ipv6 = required_family & ADDRESS_FAMILY_IPV6;
1858
1859 /* The operational state is within the range required for online.
1860 * If a particular address family is also required, we might revert
1861 * to offline in the blocks below. */
1862 online_state = LINK_ONLINE_STATE_ONLINE;
1863
1864 if (link->network->required_operstate_for_online.min >= LINK_OPERSTATE_DEGRADED) {
1865 if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_DEGRADED)
1866 online_state = LINK_ONLINE_STATE_OFFLINE;
1867 if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_DEGRADED)
1868 online_state = LINK_ONLINE_STATE_OFFLINE;
1869 }
1870
1871 if (link->network->required_operstate_for_online.min >= LINK_OPERSTATE_ROUTABLE) {
1872 if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1873 online_state = LINK_ONLINE_STATE_OFFLINE;
1874 if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1875 online_state = LINK_ONLINE_STATE_OFFLINE;
1876 }
1877 }
1878
1879 if (link->carrier_state != carrier_state) {
1880 link->carrier_state = carrier_state;
1881 changed = true;
1882 if (strv_extend(&p, "CarrierState") < 0)
1883 log_oom();
1884 }
1885
1886 if (link->address_state != address_state) {
1887 link->address_state = address_state;
1888 changed = true;
1889 if (strv_extend(&p, "AddressState") < 0)
1890 log_oom();
1891 }
1892
1893 if (link->ipv4_address_state != ipv4_address_state) {
1894 link->ipv4_address_state = ipv4_address_state;
1895 changed = true;
1896 if (strv_extend(&p, "IPv4AddressState") < 0)
1897 log_oom();
1898 }
1899
1900 if (link->ipv6_address_state != ipv6_address_state) {
1901 link->ipv6_address_state = ipv6_address_state;
1902 changed = true;
1903 if (strv_extend(&p, "IPv6AddressState") < 0)
1904 log_oom();
1905 }
1906
1907 if (link->operstate != operstate) {
1908 link->operstate = operstate;
1909 changed = true;
1910 if (strv_extend(&p, "OperationalState") < 0)
1911 log_oom();
1912 }
1913
1914 if (link->online_state != online_state) {
1915 link->online_state = online_state;
1916 changed = true;
1917 if (strv_extend(&p, "OnlineState") < 0)
1918 log_oom();
1919 }
1920
1921 if (p)
1922 link_send_changed_strv(link, p);
1923 if (changed)
1924 link_dirty(link);
1925
1926 if (also_update_master) {
1927 Link *master;
1928
1929 if (link_get_master(link, &master) >= 0)
1930 link_update_operstate(master, true);
1931 }
1932 }
1933
1934 #define FLAG_STRING(string, flag, old, new) \
1935 (((old ^ new) & flag) \
1936 ? ((old & flag) ? (" -" string) : (" +" string)) \
1937 : "")
1938
1939 static int link_update_flags(Link *link, sd_netlink_message *message) {
1940 bool link_was_admin_up, had_carrier;
1941 uint8_t operstate;
1942 unsigned flags;
1943 int r;
1944
1945 assert(link);
1946 assert(message);
1947
1948 r = sd_rtnl_message_link_get_flags(message, &flags);
1949 if (r < 0)
1950 return log_link_debug_errno(link, r, "rtnl: failed to read link flags: %m");
1951
1952 r = sd_netlink_message_read_u8(message, IFLA_OPERSTATE, &operstate);
1953 if (r == -ENODATA)
1954 /* If we got a message without operstate, assume the state was unchanged. */
1955 operstate = link->kernel_operstate;
1956 else if (r < 0)
1957 return log_link_debug_errno(link, r, "rtnl: failed to read operational state: %m");
1958
1959 if (link->flags == flags && link->kernel_operstate == operstate)
1960 return 0;
1961
1962 if (link->flags != flags) {
1963 unsigned unknown_flags, unknown_flags_added, unknown_flags_removed;
1964
1965 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",
1966 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
1967 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
1968 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
1969 FLAG_STRING("UP", IFF_UP, link->flags, flags),
1970 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
1971 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
1972 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
1973 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
1974 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
1975 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
1976 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
1977 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
1978 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
1979 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
1980 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
1981 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
1982 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
1983 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
1984 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
1985
1986 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
1987 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
1988 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
1989 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
1990 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
1991 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
1992 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
1993 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
1994
1995 if (unknown_flags_added)
1996 log_link_debug(link, "Unknown link flags gained, ignoring: %#.5x", unknown_flags_added);
1997
1998 if (unknown_flags_removed)
1999 log_link_debug(link, "Unknown link flags lost, ignoring: %#.5x", unknown_flags_removed);
2000 }
2001
2002 link_was_admin_up = link->flags & IFF_UP;
2003 had_carrier = link_has_carrier(link);
2004
2005 link->flags = flags;
2006 link->kernel_operstate = operstate;
2007
2008 link_update_operstate(link, true);
2009
2010 if (!link_was_admin_up && (link->flags & IFF_UP)) {
2011 log_link_info(link, "Link UP");
2012
2013 r = link_admin_state_up(link);
2014 if (r < 0)
2015 return r;
2016 } else if (link_was_admin_up && !(link->flags & IFF_UP)) {
2017 log_link_info(link, "Link DOWN");
2018
2019 r = link_admin_state_down(link);
2020 if (r < 0)
2021 return r;
2022 }
2023
2024 if (!had_carrier && link_has_carrier(link)) {
2025 log_link_info(link, "Gained carrier");
2026
2027 r = link_carrier_gained(link);
2028 if (r < 0)
2029 return r;
2030 } else if (had_carrier && !link_has_carrier(link)) {
2031 log_link_info(link, "Lost carrier");
2032
2033 r = link_carrier_lost(link);
2034 if (r < 0)
2035 return r;
2036 }
2037
2038 return 0;
2039 }
2040
2041 static int link_update_master(Link *link, sd_netlink_message *message) {
2042 int master_ifindex, r;
2043
2044 assert(link);
2045 assert(message);
2046
2047 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t*) &master_ifindex);
2048 if (r == -ENODATA)
2049 return 0;
2050 if (r < 0)
2051 return log_link_debug_errno(link, r, "rtnl: failed to read master ifindex: %m");
2052
2053 if (master_ifindex == link->ifindex)
2054 master_ifindex = 0;
2055
2056 if (master_ifindex != link->master_ifindex) {
2057 if (link->master_ifindex == 0)
2058 log_link_debug(link, "Attached to master interface: %i", master_ifindex);
2059 else if (master_ifindex == 0)
2060 log_link_debug(link, "Detached from master interface: %i", link->master_ifindex);
2061 else
2062 log_link_debug(link, "Master interface changed: %i %s %i", link->master_ifindex,
2063 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), master_ifindex);
2064
2065 link_drop_from_master(link);
2066 link->master_ifindex = master_ifindex;
2067 }
2068
2069 r = link_append_to_master(link);
2070 if (r < 0)
2071 return log_link_debug_errno(link, r, "Failed to append link to master: %m");
2072
2073 return 0;
2074 }
2075
2076 static int link_update_driver(Link *link, sd_netlink_message *message) {
2077 int r;
2078
2079 assert(link);
2080 assert(link->manager);
2081 assert(message);
2082
2083 /* Driver is already read. Assuming the driver is never changed. */
2084 if (link->ethtool_driver_read)
2085 return 0;
2086
2087 /* When udevd is running, read the driver after the interface is initialized by udevd.
2088 * Otherwise, ethtool may not work correctly. See issue #22538.
2089 * When udevd is not running, read the value when the interface is detected. */
2090 if (udev_available() && !link->dev)
2091 return 0;
2092
2093 link->ethtool_driver_read = true;
2094
2095 r = ethtool_get_driver(&link->manager->ethtool_fd, link->ifname, &link->driver);
2096 if (r < 0) {
2097 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
2098 return 0;
2099 }
2100
2101 log_link_debug(link, "Found driver: %s", strna(link->driver));
2102
2103 if (streq_ptr(link->driver, "dsa")) {
2104 uint32_t dsa_master_ifindex = 0;
2105
2106 r = sd_netlink_message_read_u32(message, IFLA_LINK, &dsa_master_ifindex);
2107 if (r < 0 && r != -ENODATA)
2108 return log_link_debug_errno(link, r, "rtnl: failed to read ifindex of the DSA master interface: %m");
2109
2110 if (dsa_master_ifindex > INT_MAX) {
2111 log_link_debug(link, "rtnl: received too large DSA master ifindex (%"PRIu32" > INT_MAX), ignoring.",
2112 dsa_master_ifindex);
2113 dsa_master_ifindex = 0;
2114 }
2115
2116 link->dsa_master_ifindex = (int) dsa_master_ifindex;
2117 }
2118
2119 return 1; /* needs reconfigure */
2120 }
2121
2122 static int link_update_permanent_hardware_address_from_ethtool(Link *link, sd_netlink_message *message) {
2123 int r;
2124
2125 assert(link);
2126 assert(link->manager);
2127 assert(message);
2128
2129 if (link->ethtool_permanent_hw_addr_read)
2130 return 0;
2131
2132 /* When udevd is running, read the permanent hardware address after the interface is
2133 * initialized by udevd. Otherwise, ethtool may not work correctly. See issue #22538.
2134 * When udevd is not running, read the value when the interface is detected. */
2135 if (udev_available() && !link->dev)
2136 return 0;
2137
2138 /* If the interface does not have a hardware address, then it will not have a permanent address either. */
2139 r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, NULL);
2140 if (r == -ENODATA)
2141 return 0;
2142 if (r < 0)
2143 return log_link_debug_errno(link, r, "Failed to read IFLA_ADDRESS attribute: %m");
2144
2145 link->ethtool_permanent_hw_addr_read = true;
2146
2147 r = ethtool_get_permanent_hw_addr(&link->manager->ethtool_fd, link->ifname, &link->permanent_hw_addr);
2148 if (r < 0)
2149 log_link_debug_errno(link, r, "Permanent hardware address not found, continuing without: %m");
2150
2151 return 0;
2152 }
2153
2154 static int link_update_permanent_hardware_address(Link *link, sd_netlink_message *message) {
2155 int r;
2156
2157 assert(link);
2158 assert(link->manager);
2159 assert(message);
2160
2161 if (link->permanent_hw_addr.length > 0)
2162 return 0;
2163
2164 r = netlink_message_read_hw_addr(message, IFLA_PERM_ADDRESS, &link->permanent_hw_addr);
2165 if (r < 0) {
2166 if (r != -ENODATA)
2167 return log_link_debug_errno(link, r, "Failed to read IFLA_PERM_ADDRESS attribute: %m");
2168
2169 /* Fallback to ethtool for older kernels. */
2170 r = link_update_permanent_hardware_address_from_ethtool(link, message);
2171 if (r < 0)
2172 return r;
2173 }
2174
2175 if (link->permanent_hw_addr.length > 0)
2176 log_link_debug(link, "Saved permanent hardware address: %s", HW_ADDR_TO_STR(&link->permanent_hw_addr));
2177
2178 return 1; /* needs reconfigure */
2179 }
2180
2181 static int link_update_hardware_address(Link *link, sd_netlink_message *message) {
2182 struct hw_addr_data addr;
2183 int r;
2184
2185 assert(link);
2186 assert(message);
2187
2188 r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr);
2189 if (r < 0 && r != -ENODATA)
2190 return log_link_debug_errno(link, r, "rtnl: failed to read broadcast address: %m");
2191
2192 r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &addr);
2193 if (r == -ENODATA)
2194 return 0;
2195 if (r < 0)
2196 return log_link_debug_errno(link, r, "rtnl: failed to read hardware address: %m");
2197
2198 if (hw_addr_equal(&link->hw_addr, &addr))
2199 return 0;
2200
2201 if (link->hw_addr.length == 0)
2202 log_link_debug(link, "Saved hardware address: %s", HW_ADDR_TO_STR(&addr));
2203 else {
2204 log_link_debug(link, "Hardware address is changed: %s %s %s",
2205 HW_ADDR_TO_STR(&link->hw_addr),
2206 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT),
2207 HW_ADDR_TO_STR(&addr));
2208
2209 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
2210 }
2211
2212 link->hw_addr = addr;
2213
2214 if (!hw_addr_is_null(&link->hw_addr)) {
2215 r = hashmap_ensure_put(&link->manager->links_by_hw_addr, &hw_addr_hash_ops, &link->hw_addr, link);
2216 if (r == -EEXIST && streq_ptr(link->kind, "bond"))
2217 /* bonding master and its slaves have the same hardware address. */
2218 r = hashmap_replace(link->manager->links_by_hw_addr, &link->hw_addr, link);
2219 if (r < 0)
2220 log_link_debug_errno(link, r, "Failed to manage link by its new hardware address, ignoring: %m");
2221 }
2222
2223 r = ipv4acd_update_mac(link);
2224 if (r < 0)
2225 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m");
2226
2227 r = ipv4ll_update_mac(link);
2228 if (r < 0)
2229 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
2230
2231 r = dhcp4_update_mac(link);
2232 if (r < 0)
2233 return log_link_debug_errno(link, r, "Could not update MAC address in DHCP client: %m");
2234
2235 r = dhcp6_update_mac(link);
2236 if (r < 0)
2237 return log_link_debug_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
2238
2239 r = radv_update_mac(link);
2240 if (r < 0)
2241 return log_link_debug_errno(link, r, "Could not update MAC address for Router Advertisement: %m");
2242
2243 if (link->ndisc && link->hw_addr.length == ETH_ALEN) {
2244 r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether);
2245 if (r < 0)
2246 return log_link_debug_errno(link, r, "Could not update MAC for NDisc: %m");
2247 }
2248
2249 if (link->lldp_rx) {
2250 r = sd_lldp_rx_set_filter_address(link->lldp_rx, &link->hw_addr.ether);
2251 if (r < 0)
2252 return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Rx: %m");
2253 }
2254
2255 if (link->lldp_tx) {
2256 r = sd_lldp_tx_set_hwaddr(link->lldp_tx, &link->hw_addr.ether);
2257 if (r < 0)
2258 return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Tx: %m");
2259 }
2260
2261 return 1; /* needs reconfigure */
2262 }
2263
2264 static int link_update_mtu(Link *link, sd_netlink_message *message) {
2265 uint32_t mtu, min_mtu = 0, max_mtu = UINT32_MAX;
2266 int r;
2267
2268 assert(link);
2269 assert(message);
2270
2271 r = sd_netlink_message_read_u32(message, IFLA_MTU, &mtu);
2272 if (r == -ENODATA)
2273 return 0;
2274 if (r < 0)
2275 return log_link_debug_errno(link, r, "rtnl: failed to read MTU in RTM_NEWLINK message: %m");
2276 if (mtu == 0)
2277 return 0;
2278
2279 r = sd_netlink_message_read_u32(message, IFLA_MIN_MTU, &min_mtu);
2280 if (r < 0 && r != -ENODATA)
2281 return log_link_debug_errno(link, r, "rtnl: failed to read minimum MTU in RTM_NEWLINK message: %m");
2282
2283 r = sd_netlink_message_read_u32(message, IFLA_MAX_MTU, &max_mtu);
2284 if (r < 0 && r != -ENODATA)
2285 return log_link_debug_errno(link, r, "rtnl: failed to read maximum MTU in RTM_NEWLINK message: %m");
2286
2287 if (max_mtu == 0)
2288 max_mtu = UINT32_MAX;
2289
2290 link->min_mtu = min_mtu;
2291 link->max_mtu = max_mtu;
2292
2293 if (link->original_mtu == 0) {
2294 link->original_mtu = mtu;
2295 log_link_debug(link, "Saved original MTU %" PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2296 link->original_mtu, link->min_mtu, link->max_mtu);
2297 }
2298
2299 if (link->mtu == mtu)
2300 return 0;
2301
2302 if (link->mtu != 0)
2303 log_link_debug(link, "MTU is changed: %"PRIu32" %s %"PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2304 link->mtu, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), mtu,
2305 link->min_mtu, link->max_mtu);
2306
2307 link->mtu = mtu;
2308
2309 if (link->dhcp_client) {
2310 r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
2311 if (r < 0)
2312 return log_link_debug_errno(link, r, "Could not update MTU in DHCP client: %m");
2313 }
2314
2315 if (link->radv) {
2316 r = sd_radv_set_mtu(link->radv, link->mtu);
2317 if (r < 0)
2318 return log_link_debug_errno(link, r, "Could not set MTU for Router Advertisement: %m");
2319 }
2320
2321 return 0;
2322 }
2323
2324 static int link_update_alternative_names(Link *link, sd_netlink_message *message) {
2325 _cleanup_strv_free_ char **altnames = NULL;
2326 int r;
2327
2328 assert(link);
2329 assert(message);
2330
2331 r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &altnames);
2332 if (r == -ENODATA)
2333 /* The message does not have IFLA_PROP_LIST container attribute. It does not mean the
2334 * interface has no alternative name. */
2335 return 0;
2336 if (r < 0)
2337 return log_link_debug_errno(link, r, "rtnl: failed to read alternative names: %m");
2338
2339 if (strv_equal(altnames, link->alternative_names))
2340 return 0;
2341
2342 STRV_FOREACH(n, link->alternative_names)
2343 hashmap_remove(link->manager->links_by_name, *n);
2344
2345 strv_free_and_replace(link->alternative_names, altnames);
2346
2347 STRV_FOREACH(n, link->alternative_names) {
2348 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, *n, link);
2349 if (r < 0)
2350 return log_link_debug_errno(link, r, "Failed to manage link by its new alternative names: %m");
2351 }
2352
2353 return 1; /* needs reconfigure */
2354 }
2355
2356 static int link_update_name(Link *link, sd_netlink_message *message) {
2357 char ifname_from_index[IF_NAMESIZE];
2358 const char *ifname;
2359 int r;
2360
2361 assert(link);
2362 assert(message);
2363
2364 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
2365 if (r == -ENODATA)
2366 /* Hmm?? But ok. */
2367 return 0;
2368 if (r < 0)
2369 return log_link_debug_errno(link, r, "Failed to read interface name in RTM_NEWLINK message: %m");
2370
2371 if (streq(ifname, link->ifname))
2372 return 0;
2373
2374 r = format_ifname(link->ifindex, ifname_from_index);
2375 if (r < 0)
2376 return log_link_debug_errno(link, r, "Could not get interface name for index %i.", link->ifindex);
2377
2378 if (!streq(ifname, ifname_from_index)) {
2379 log_link_debug(link, "New interface name '%s' received from the kernel does not correspond "
2380 "with the name currently configured on the actual interface '%s'. Ignoring.",
2381 ifname, ifname_from_index);
2382 return 0;
2383 }
2384
2385 log_link_info(link, "Interface name change detected, renamed to %s.", ifname);
2386
2387 hashmap_remove(link->manager->links_by_name, link->ifname);
2388
2389 r = free_and_strdup(&link->ifname, ifname);
2390 if (r < 0)
2391 return log_oom_debug();
2392
2393 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, link->ifname, link);
2394 if (r < 0)
2395 return log_link_debug_errno(link, r, "Failed to manage link by its new name: %m");
2396
2397 if (link->dhcp_client) {
2398 r = sd_dhcp_client_set_ifname(link->dhcp_client, link->ifname);
2399 if (r < 0)
2400 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP client: %m");
2401 }
2402
2403 if (link->dhcp6_client) {
2404 r = sd_dhcp6_client_set_ifname(link->dhcp6_client, link->ifname);
2405 if (r < 0)
2406 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP6 client: %m");
2407 }
2408
2409 if (link->ndisc) {
2410 r = sd_ndisc_set_ifname(link->ndisc, link->ifname);
2411 if (r < 0)
2412 return log_link_debug_errno(link, r, "Failed to update interface name in NDisc: %m");
2413 }
2414
2415 if (link->dhcp_server) {
2416 r = sd_dhcp_server_set_ifname(link->dhcp_server, link->ifname);
2417 if (r < 0)
2418 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP server: %m");
2419 }
2420
2421 if (link->radv) {
2422 r = sd_radv_set_ifname(link->radv, link->ifname);
2423 if (r < 0)
2424 return log_link_debug_errno(link, r, "Failed to update interface name in Router Advertisement: %m");
2425 }
2426
2427 if (link->lldp_rx) {
2428 r = sd_lldp_rx_set_ifname(link->lldp_rx, link->ifname);
2429 if (r < 0)
2430 return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Rx: %m");
2431 }
2432
2433 if (link->lldp_tx) {
2434 r = sd_lldp_tx_set_ifname(link->lldp_tx, link->ifname);
2435 if (r < 0)
2436 return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Tx: %m");
2437 }
2438
2439 if (link->ipv4ll) {
2440 r = sd_ipv4ll_set_ifname(link->ipv4ll, link->ifname);
2441 if (r < 0)
2442 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4LL client: %m");
2443 }
2444
2445 r = ipv4acd_set_ifname(link);
2446 if (r < 0)
2447 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4ACD client: %m");
2448
2449 return 1; /* needs reconfigure */
2450 }
2451
2452 static int link_update(Link *link, sd_netlink_message *message) {
2453 bool needs_reconfigure = false;
2454 int r;
2455
2456 assert(link);
2457 assert(message);
2458
2459 r = link_update_name(link, message);
2460 if (r < 0)
2461 return r;
2462 needs_reconfigure = needs_reconfigure || r > 0;
2463
2464 r = link_update_alternative_names(link, message);
2465 if (r < 0)
2466 return r;
2467 needs_reconfigure = needs_reconfigure || r > 0;
2468
2469 r = link_update_mtu(link, message);
2470 if (r < 0)
2471 return r;
2472
2473 r = link_update_driver(link, message);
2474 if (r < 0)
2475 return r;
2476 needs_reconfigure = needs_reconfigure || r > 0;
2477
2478 r = link_update_permanent_hardware_address(link, message);
2479 if (r < 0)
2480 return r;
2481 needs_reconfigure = needs_reconfigure || r > 0;
2482
2483 r = link_update_hardware_address(link, message);
2484 if (r < 0)
2485 return r;
2486 needs_reconfigure = needs_reconfigure || r > 0;
2487
2488 r = link_update_master(link, message);
2489 if (r < 0)
2490 return r;
2491
2492 r = link_update_ipv6ll_addrgen_mode(link, message);
2493 if (r < 0)
2494 return r;
2495
2496 r = link_update_flags(link, message);
2497 if (r < 0)
2498 return r;
2499
2500 r = link_update_bridge_vlan(link, message);
2501 if (r < 0)
2502 return r;
2503
2504 return needs_reconfigure;
2505 }
2506
2507 static Link *link_drop_or_unref(Link *link) {
2508 if (!link)
2509 return NULL;
2510 if (!link->manager)
2511 return link_unref(link);
2512 return link_drop(link);
2513 }
2514
2515 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_drop_or_unref);
2516
2517 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
2518 _cleanup_free_ char *ifname = NULL, *kind = NULL, *state_file = NULL, *lease_file = NULL, *lldp_file = NULL;
2519 _cleanup_(link_drop_or_unrefp) Link *link = NULL;
2520 unsigned short iftype;
2521 int r, ifindex;
2522
2523 assert(manager);
2524 assert(message);
2525 assert(ret);
2526
2527 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2528 if (r < 0)
2529 return log_debug_errno(r, "rtnl: failed to read ifindex from link message: %m");
2530 else if (ifindex <= 0)
2531 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "rtnl: received link message without valid ifindex.");
2532
2533 r = sd_rtnl_message_link_get_type(message, &iftype);
2534 if (r < 0)
2535 return log_debug_errno(r, "rtnl: failed to read interface type from link message: %m");
2536
2537 r = sd_netlink_message_read_string_strdup(message, IFLA_IFNAME, &ifname);
2538 if (r < 0)
2539 return log_debug_errno(r, "rtnl: failed to read interface name from link message: %m");
2540
2541 /* check for link kind */
2542 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
2543 if (r >= 0) {
2544 r = sd_netlink_message_read_string_strdup(message, IFLA_INFO_KIND, &kind);
2545 if (r < 0 && r != -ENODATA)
2546 return log_debug_errno(r, "rtnl: failed to read interface kind from link message: %m");
2547 r = sd_netlink_message_exit_container(message);
2548 if (r < 0)
2549 return log_debug_errno(r, "rtnl: failed to exit IFLA_LINKINFO container: %m");
2550 }
2551
2552 if (!manager->test_mode) {
2553 /* Do not update state files when running in test mode. */
2554 if (asprintf(&state_file, "/run/systemd/netif/links/%d", ifindex) < 0)
2555 return log_oom_debug();
2556
2557 if (asprintf(&lease_file, "/run/systemd/netif/leases/%d", ifindex) < 0)
2558 return log_oom_debug();
2559
2560 if (asprintf(&lldp_file, "/run/systemd/netif/lldp/%d", ifindex) < 0)
2561 return log_oom_debug();
2562 }
2563
2564 link = new(Link, 1);
2565 if (!link)
2566 return -ENOMEM;
2567
2568 *link = (Link) {
2569 .n_ref = 1,
2570 .state = LINK_STATE_PENDING,
2571 .online_state = _LINK_ONLINE_STATE_INVALID,
2572 .automatic_reconfigure_ratelimit = (const RateLimit) { .interval = 10 * USEC_PER_SEC, .burst = 5 },
2573 .ifindex = ifindex,
2574 .iftype = iftype,
2575 .ifname = TAKE_PTR(ifname),
2576 .kind = TAKE_PTR(kind),
2577
2578 .bridge_vlan_pvid = UINT16_MAX,
2579
2580 .ipv6ll_address_gen_mode = _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_INVALID,
2581
2582 .state_file = TAKE_PTR(state_file),
2583 .lease_file = TAKE_PTR(lease_file),
2584 .lldp_file = TAKE_PTR(lldp_file),
2585
2586 .n_dns = UINT_MAX,
2587 .dns_default_route = -1,
2588 .llmnr = _RESOLVE_SUPPORT_INVALID,
2589 .mdns = _RESOLVE_SUPPORT_INVALID,
2590 .dnssec_mode = _DNSSEC_MODE_INVALID,
2591 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
2592 };
2593
2594 r = hashmap_ensure_put(&manager->links_by_index, NULL, INT_TO_PTR(link->ifindex), link);
2595 if (r < 0)
2596 return log_link_debug_errno(link, r, "Failed to store link into manager: %m");
2597
2598 link->manager = manager;
2599
2600 r = hashmap_ensure_put(&manager->links_by_name, &string_hash_ops, link->ifname, link);
2601 if (r < 0)
2602 return log_link_debug_errno(link, r, "Failed to manage link by its interface name: %m");
2603
2604 log_link_debug(link, "Saved new link: ifindex=%i, iftype=%s(%u), kind=%s",
2605 link->ifindex, strna(arphrd_to_name(link->iftype)), link->iftype, strna(link->kind));
2606
2607 /* If contained in this set, the link is wireless and the corresponding NL80211_CMD_NEW_INTERFACE
2608 * message arrived too early. Request the wireless link information again.
2609 */
2610 if (set_remove(manager->new_wlan_ifindices, INT_TO_PTR(link->ifindex))) {
2611 r = link_get_wlan_interface(link);
2612 if (r < 0)
2613 log_link_warning_errno(link, r, "Failed to get wireless interface, ignoring: %m");
2614 }
2615
2616 *ret = TAKE_PTR(link);
2617 return 0;
2618 }
2619
2620 int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, Manager *manager) {
2621 Link *link = NULL;
2622 NetDev *netdev = NULL;
2623 uint16_t type;
2624 const char *name;
2625 int r, ifindex;
2626
2627 assert(rtnl);
2628 assert(message);
2629 assert(manager);
2630
2631 if (sd_netlink_message_is_error(message)) {
2632 r = sd_netlink_message_get_errno(message);
2633 if (r < 0)
2634 log_message_warning_errno(message, r, "rtnl: Could not receive link message, ignoring");
2635
2636 return 0;
2637 }
2638
2639 r = sd_netlink_message_get_type(message, &type);
2640 if (r < 0) {
2641 log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
2642 return 0;
2643 } else if (!IN_SET(type, RTM_NEWLINK, RTM_DELLINK)) {
2644 log_warning("rtnl: Received unexpected message type %u when processing link, ignoring.", type);
2645 return 0;
2646 }
2647
2648 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2649 if (r < 0) {
2650 log_warning_errno(r, "rtnl: Could not get ifindex from link message, ignoring: %m");
2651 return 0;
2652 } else if (ifindex <= 0) {
2653 log_warning("rtnl: received link message with invalid ifindex %d, ignoring.", ifindex);
2654 return 0;
2655 }
2656
2657 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
2658 if (r < 0) {
2659 log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
2660 return 0;
2661 }
2662
2663 (void) link_get_by_index(manager, ifindex, &link);
2664 (void) netdev_get(manager, name, &netdev);
2665
2666 switch (type) {
2667 case RTM_NEWLINK:
2668 if (netdev) {
2669 /* netdev exists, so make sure the ifindex matches */
2670 r = netdev_set_ifindex(netdev, message);
2671 if (r < 0) {
2672 log_netdev_warning_errno(netdev, r, "Could not process new link message for netdev, ignoring: %m");
2673 return 0;
2674 }
2675 }
2676
2677 if (!link) {
2678 /* link is new, so add it */
2679 r = link_new(manager, message, &link);
2680 if (r < 0) {
2681 log_warning_errno(r, "Could not process new link message: %m");
2682 return 0;
2683 }
2684
2685 r = link_update(link, message);
2686 if (r < 0) {
2687 log_link_warning_errno(link, r, "Could not process link message: %m");
2688 link_enter_failed(link);
2689 return 0;
2690 }
2691
2692 r = link_check_initialized(link);
2693 if (r < 0) {
2694 log_link_warning_errno(link, r, "Failed to check link is initialized: %m");
2695 link_enter_failed(link);
2696 return 0;
2697 }
2698 } else {
2699 r = link_update(link, message);
2700 if (r < 0) {
2701 log_link_warning_errno(link, r, "Could not process link message: %m");
2702 link_enter_failed(link);
2703 return 0;
2704 }
2705 if (r > 0) {
2706 r = link_reconfigure_impl(link, /* force = */ false);
2707 if (r < 0) {
2708 log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
2709 link_enter_failed(link);
2710 return 0;
2711 }
2712 }
2713 }
2714 break;
2715
2716 case RTM_DELLINK:
2717 link_drop(link);
2718 netdev_drop(netdev);
2719 break;
2720
2721 default:
2722 assert_not_reached();
2723 }
2724
2725 return 1;
2726 }
2727
2728 int link_getlink_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, const char *error_msg) {
2729 uint16_t message_type;
2730 int r;
2731
2732 assert(m);
2733 assert(link);
2734 assert(error_msg);
2735
2736 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2737 return 0;
2738
2739 r = sd_netlink_message_get_errno(m);
2740 if (r < 0) {
2741 log_link_message_warning_errno(link, m, r, error_msg);
2742 link_enter_failed(link);
2743 return 0;
2744 }
2745
2746 r = sd_netlink_message_get_type(m, &message_type);
2747 if (r < 0) {
2748 log_link_debug_errno(link, r, "rtnl: failed to read link message type, ignoring: %m");
2749 return 0;
2750 }
2751 if (message_type != RTM_NEWLINK) {
2752 log_link_debug(link, "rtnl: received invalid link message type, ignoring.");
2753 return 0;
2754 }
2755
2756 r = link_update(link, m);
2757 if (r < 0) {
2758 link_enter_failed(link);
2759 return 0;
2760 }
2761
2762 return 1;
2763 }
2764
2765 int link_call_getlink(Link *link, link_netlink_message_handler_t callback) {
2766 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2767 int r;
2768
2769 assert(link);
2770 assert(link->manager);
2771 assert(link->manager->rtnl);
2772 assert(callback);
2773
2774 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
2775 if (r < 0)
2776 return r;
2777
2778 r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
2779 link_netlink_destroy_callback, link);
2780 if (r < 0)
2781 return r;
2782
2783 link_ref(link);
2784 return 0;
2785 }
2786
2787 static const char* const link_state_table[_LINK_STATE_MAX] = {
2788 [LINK_STATE_PENDING] = "pending",
2789 [LINK_STATE_INITIALIZED] = "initialized",
2790 [LINK_STATE_CONFIGURING] = "configuring",
2791 [LINK_STATE_CONFIGURED] = "configured",
2792 [LINK_STATE_UNMANAGED] = "unmanaged",
2793 [LINK_STATE_FAILED] = "failed",
2794 [LINK_STATE_LINGER] = "linger",
2795 };
2796
2797 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
2798
2799 int link_flags_to_string_alloc(uint32_t flags, char **ret) {
2800 _cleanup_free_ char *str = NULL;
2801 static const char* map[] = {
2802 [LOG2U(IFF_UP)] = "up", /* interface is up. */
2803 [LOG2U(IFF_BROADCAST)] = "broadcast", /* broadcast address valid. */
2804 [LOG2U(IFF_DEBUG)] = "debug", /* turn on debugging. */
2805 [LOG2U(IFF_LOOPBACK)] = "loopback", /* interface is a loopback net. */
2806 [LOG2U(IFF_POINTOPOINT)] = "point-to-point", /* interface has p-p link. */
2807 [LOG2U(IFF_NOTRAILERS)] = "no-trailers", /* avoid use of trailers. */
2808 [LOG2U(IFF_RUNNING)] = "running", /* interface RFC2863 OPER_UP. */
2809 [LOG2U(IFF_NOARP)] = "no-arp", /* no ARP protocol. */
2810 [LOG2U(IFF_PROMISC)] = "promiscuous", /* receive all packets. */
2811 [LOG2U(IFF_ALLMULTI)] = "all-multicast", /* receive all multicast packets. */
2812 [LOG2U(IFF_MASTER)] = "master", /* master of a load balancer. */
2813 [LOG2U(IFF_SLAVE)] = "slave", /* slave of a load balancer. */
2814 [LOG2U(IFF_MULTICAST)] = "multicast", /* supports multicast. */
2815 [LOG2U(IFF_PORTSEL)] = "portsel", /* can set media type. */
2816 [LOG2U(IFF_AUTOMEDIA)] = "auto-media", /* auto media select active. */
2817 [LOG2U(IFF_DYNAMIC)] = "dynamic", /* dialup device with changing addresses. */
2818 [LOG2U(IFF_LOWER_UP)] = "lower-up", /* driver signals L1 up. */
2819 [LOG2U(IFF_DORMANT)] = "dormant", /* driver signals dormant. */
2820 [LOG2U(IFF_ECHO)] = "echo", /* echo sent packets. */
2821 };
2822
2823 assert(ret);
2824
2825 for (size_t i = 0; i < ELEMENTSOF(map); i++)
2826 if (FLAGS_SET(flags, 1 << i) && map[i])
2827 if (!strextend_with_separator(&str, ",", map[i]))
2828 return -ENOMEM;
2829
2830 *ret = TAKE_PTR(str);
2831 return 0;
2832 }
2833
2834 static const char * const kernel_operstate_table[] = {
2835 [IF_OPER_UNKNOWN] = "unknown",
2836 [IF_OPER_NOTPRESENT] = "not-present",
2837 [IF_OPER_DOWN] = "down",
2838 [IF_OPER_LOWERLAYERDOWN] = "lower-layer-down",
2839 [IF_OPER_TESTING] = "testing",
2840 [IF_OPER_DORMANT] = "dormant",
2841 [IF_OPER_UP] = "up",
2842 };
2843
2844 DEFINE_STRING_TABLE_LOOKUP_TO_STRING(kernel_operstate, int);
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