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network: ndisc: also introduce timer event source to drop outdated settings
[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 "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-can.h"
38 #include "networkd-dhcp-prefix-delegation.h"
39 #include "networkd-dhcp-server.h"
40 #include "networkd-dhcp4.h"
41 #include "networkd-dhcp6.h"
42 #include "networkd-ipv4acd.h"
43 #include "networkd-ipv4ll.h"
44 #include "networkd-ipv6-proxy-ndp.h"
45 #include "networkd-link-bus.h"
46 #include "networkd-link.h"
47 #include "networkd-lldp-tx.h"
48 #include "networkd-manager.h"
49 #include "networkd-ndisc.h"
50 #include "networkd-neighbor.h"
51 #include "networkd-nexthop.h"
52 #include "networkd-queue.h"
53 #include "networkd-radv.h"
54 #include "networkd-route.h"
55 #include "networkd-routing-policy-rule.h"
56 #include "networkd-setlink.h"
57 #include "networkd-sriov.h"
58 #include "networkd-state-file.h"
59 #include "networkd-sysctl.h"
60 #include "set.h"
61 #include "socket-util.h"
62 #include "stdio-util.h"
63 #include "string-table.h"
64 #include "strv.h"
65 #include "tc.h"
66 #include "tmpfile-util.h"
67 #include "tuntap.h"
68 #include "udev-util.h"
69 #include "util.h"
70 #include "vrf.h"
71
72 bool link_ipv6_enabled(Link *link) {
73 assert(link);
74
75 if (!socket_ipv6_is_supported())
76 return false;
77
78 if (link->iftype == ARPHRD_CAN)
79 return false;
80
81 if (!link->network)
82 return false;
83
84 if (link->network->bond)
85 return false;
86
87 if (link_may_have_ipv6ll(link, /* check_multicast = */ false))
88 return true;
89
90 if (network_has_static_ipv6_configurations(link->network))
91 return true;
92
93 return false;
94 }
95
96 static bool link_is_ready_to_configure_one(Link *link, bool allow_unmanaged) {
97 assert(link);
98
99 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED, LINK_STATE_UNMANAGED))
100 return false;
101
102 if (!link->network)
103 return allow_unmanaged;
104
105 if (!link->network->configure_without_carrier) {
106 if (link->set_flags_messages > 0)
107 return false;
108
109 if (!link_has_carrier(link))
110 return false;
111 }
112
113 if (link->set_link_messages > 0)
114 return false;
115
116 if (!link->activated)
117 return false;
118
119 return true;
120 }
121
122 bool link_is_ready_to_configure(Link *link, bool allow_unmanaged) {
123 return check_ready_for_all_sr_iov_ports(link, allow_unmanaged, link_is_ready_to_configure_one);
124 }
125
126 void link_ntp_settings_clear(Link *link) {
127 link->ntp = strv_free(link->ntp);
128 }
129
130 void link_dns_settings_clear(Link *link) {
131 if (link->n_dns != UINT_MAX)
132 for (unsigned i = 0; i < link->n_dns; i++)
133 in_addr_full_free(link->dns[i]);
134 link->dns = mfree(link->dns);
135 link->n_dns = UINT_MAX;
136
137 link->search_domains = ordered_set_free(link->search_domains);
138 link->route_domains = ordered_set_free(link->route_domains);
139
140 link->dns_default_route = -1;
141 link->llmnr = _RESOLVE_SUPPORT_INVALID;
142 link->mdns = _RESOLVE_SUPPORT_INVALID;
143 link->dnssec_mode = _DNSSEC_MODE_INVALID;
144 link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
145
146 link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
147 }
148
149 static void link_free_engines(Link *link) {
150 if (!link)
151 return;
152
153 link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
154 link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client);
155 link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
156 link->dhcp4_6rd_tunnel_name = mfree(link->dhcp4_6rd_tunnel_name);
157
158 link->lldp_rx = sd_lldp_rx_unref(link->lldp_rx);
159 link->lldp_tx = sd_lldp_tx_unref(link->lldp_tx);
160
161 ndisc_flush(link);
162
163 link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
164 link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
165 link->dhcp6_lease = sd_dhcp6_lease_unref(link->dhcp6_lease);
166 link->ndisc = sd_ndisc_unref(link->ndisc);
167 link->radv = sd_radv_unref(link->radv);
168 }
169
170 static Link *link_free(Link *link) {
171 assert(link);
172
173 link_ntp_settings_clear(link);
174 link_dns_settings_clear(link);
175
176 link->routes = set_free(link->routes);
177 link->nexthops = set_free(link->nexthops);
178 link->neighbors = set_free(link->neighbors);
179 link->addresses = set_free(link->addresses);
180 link->qdiscs = set_free(link->qdiscs);
181 link->tclasses = set_free(link->tclasses);
182
183 link->dhcp_pd_prefixes = set_free(link->dhcp_pd_prefixes);
184
185 link_free_engines(link);
186
187 set_free(link->sr_iov_virt_port_ifindices);
188 free(link->ifname);
189 strv_free(link->alternative_names);
190 free(link->kind);
191 free(link->ssid);
192 free(link->previous_ssid);
193 free(link->driver);
194
195 unlink_and_free(link->lease_file);
196 unlink_and_free(link->lldp_file);
197 unlink_and_free(link->state_file);
198
199 sd_device_unref(link->dev);
200 netdev_unref(link->netdev);
201
202 hashmap_free(link->bound_to_links);
203 hashmap_free(link->bound_by_links);
204
205 set_free_with_destructor(link->slaves, link_unref);
206
207 network_unref(link->network);
208
209 sd_event_source_disable_unref(link->carrier_lost_timer);
210
211 return mfree(link);
212 }
213
214 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
215
216 int link_get_by_index(Manager *m, int ifindex, Link **ret) {
217 Link *link;
218
219 assert(m);
220 assert(ifindex > 0);
221
222 link = hashmap_get(m->links_by_index, INT_TO_PTR(ifindex));
223 if (!link)
224 return -ENODEV;
225
226 if (ret)
227 *ret = link;
228 return 0;
229 }
230
231 int link_get_by_name(Manager *m, const char *ifname, Link **ret) {
232 Link *link;
233
234 assert(m);
235 assert(ifname);
236
237 link = hashmap_get(m->links_by_name, ifname);
238 if (!link)
239 return -ENODEV;
240
241 if (ret)
242 *ret = link;
243 return 0;
244 }
245
246 int link_get_by_hw_addr(Manager *m, const struct hw_addr_data *hw_addr, Link **ret) {
247 Link *link;
248
249 assert(m);
250 assert(hw_addr);
251
252 link = hashmap_get(m->links_by_hw_addr, hw_addr);
253 if (!link)
254 return -ENODEV;
255
256 if (ret)
257 *ret = link;
258 return 0;
259 }
260
261 int link_get_master(Link *link, Link **ret) {
262 assert(link);
263 assert(link->manager);
264 assert(ret);
265
266 if (link->master_ifindex <= 0 || link->master_ifindex == link->ifindex)
267 return -ENODEV;
268
269 return link_get_by_index(link->manager, link->master_ifindex, ret);
270 }
271
272 void link_set_state(Link *link, LinkState state) {
273 assert(link);
274
275 if (link->state == state)
276 return;
277
278 log_link_debug(link, "State changed: %s -> %s",
279 link_state_to_string(link->state),
280 link_state_to_string(state));
281
282 link->state = state;
283
284 link_send_changed(link, "AdministrativeState", NULL);
285 link_dirty(link);
286 }
287
288 int link_stop_engines(Link *link, bool may_keep_dhcp) {
289 int r = 0, k;
290
291 assert(link);
292 assert(link->manager);
293 assert(link->manager->event);
294
295 bool keep_dhcp = may_keep_dhcp &&
296 link->network &&
297 !link->network->dhcp_send_decline && /* IPv4 ACD for the DHCPv4 address is running. */
298 (link->manager->restarting ||
299 FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
300
301 if (!keep_dhcp) {
302 k = sd_dhcp_client_stop(link->dhcp_client);
303 if (k < 0)
304 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
305 }
306
307 k = sd_dhcp_server_stop(link->dhcp_server);
308 if (k < 0)
309 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 server: %m");
310
311 k = sd_lldp_rx_stop(link->lldp_rx);
312 if (k < 0)
313 r = log_link_warning_errno(link, k, "Could not stop LLDP Rx: %m");
314
315 k = sd_lldp_tx_stop(link->lldp_tx);
316 if (k < 0)
317 r = log_link_warning_errno(link, k, "Could not stop LLDP Tx: %m");
318
319 k = sd_ipv4ll_stop(link->ipv4ll);
320 if (k < 0)
321 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
322
323 k = ipv4acd_stop(link);
324 if (k < 0)
325 r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client: %m");
326
327 k = sd_dhcp6_client_stop(link->dhcp6_client);
328 if (k < 0)
329 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
330
331 k = dhcp_pd_remove(link, /* only_marked = */ false);
332 if (k < 0)
333 r = log_link_warning_errno(link, k, "Could not remove DHCPv6 PD addresses and routes: %m");
334
335 k = ndisc_stop(link);
336 if (k < 0)
337 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
338
339 ndisc_flush(link);
340
341 k = sd_radv_stop(link->radv);
342 if (k < 0)
343 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
344
345 return r;
346 }
347
348 void link_enter_failed(Link *link) {
349 assert(link);
350
351 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
352 return;
353
354 log_link_warning(link, "Failed");
355
356 link_set_state(link, LINK_STATE_FAILED);
357
358 (void) link_stop_engines(link, false);
359 }
360
361 void link_check_ready(Link *link) {
362 Address *a;
363
364 assert(link);
365
366 if (link->state == LINK_STATE_CONFIGURED)
367 return;
368
369 if (link->state != LINK_STATE_CONFIGURING)
370 return (void) log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state));
371
372 if (!link->network)
373 return (void) log_link_debug(link, "%s(): link is unmanaged.", __func__);
374
375 if (!link->tc_configured)
376 return (void) log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
377
378 if (link->set_link_messages > 0)
379 return (void) log_link_debug(link, "%s(): link layer is configuring.", __func__);
380
381 if (!link->activated)
382 return (void) log_link_debug(link, "%s(): link is not activated.", __func__);
383
384 if (link->iftype == ARPHRD_CAN) {
385 /* let's shortcut things for CAN which doesn't need most of checks below. */
386 link_set_state(link, LINK_STATE_CONFIGURED);
387 return;
388 }
389
390 if (!link->stacked_netdevs_created)
391 return (void) log_link_debug(link, "%s(): stacked netdevs are not created.", __func__);
392
393 if (!link->static_addresses_configured)
394 return (void) log_link_debug(link, "%s(): static addresses are not configured.", __func__);
395
396 SET_FOREACH(a, link->addresses)
397 if (!address_is_ready(a))
398 return (void) log_link_debug(link, "%s(): address %s is not ready.", __func__,
399 IN_ADDR_PREFIX_TO_STRING(a->family, &a->in_addr, a->prefixlen));
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 bool has_dynamic_address = false;
435 SET_FOREACH(a, link->addresses) {
436 if (address_is_marked(a))
437 continue;
438 if (!address_exists(a))
439 continue;
440 if (IN_SET(a->source,
441 NETWORK_CONFIG_SOURCE_IPV4LL,
442 NETWORK_CONFIG_SOURCE_DHCP4,
443 NETWORK_CONFIG_SOURCE_DHCP6,
444 NETWORK_CONFIG_SOURCE_DHCP_PD,
445 NETWORK_CONFIG_SOURCE_NDISC)) {
446 has_dynamic_address = true;
447 break;
448 }
449 }
450
451 if ((link_ipv4ll_enabled(link) || link_dhcp4_enabled(link) || link_dhcp6_with_address_enabled(link) ||
452 (link_dhcp_pd_is_enabled(link) && link->network->dhcp_pd_assign)) && !has_dynamic_address)
453 /* When DHCP[46] or IPv4LL is enabled, at least one address is acquired by them. */
454 return (void) log_link_debug(link, "%s(): DHCPv4, DHCPv6, DHCP-PD or IPv4LL is enabled but no dynamic address is assigned yet.", __func__);
455
456 /* Ignore NDisc when ConfigureWithoutCarrier= is enabled, as IPv6AcceptRA= is enabled by default. */
457 if (link_ipv4ll_enabled(link) || link_dhcp4_enabled(link) ||
458 link_dhcp6_enabled(link) || link_dhcp_pd_is_enabled(link) ||
459 (!link->network->configure_without_carrier && link_ipv6_accept_ra_enabled(link))) {
460
461 if (!link->ipv4ll_address_configured && !link->dhcp4_configured &&
462 !link->dhcp6_configured && !link->dhcp_pd_configured && !link->ndisc_configured)
463 /* When DHCP[46], NDisc, or IPv4LL is enabled, at least one protocol must be finished. */
464 return (void) log_link_debug(link, "%s(): dynamic addresses or routes are not configured.", __func__);
465
466 log_link_debug(link, "%s(): IPv4LL:%s DHCPv4:%s DHCPv6:%s DHCP-PD:%s NDisc:%s",
467 __func__,
468 yes_no(link->ipv4ll_address_configured),
469 yes_no(link->dhcp4_configured),
470 yes_no(link->dhcp6_configured),
471 yes_no(link->dhcp_pd_configured),
472 yes_no(link->ndisc_configured));
473 }
474
475 link_set_state(link, LINK_STATE_CONFIGURED);
476 }
477
478 static int link_request_static_configs(Link *link) {
479 int r;
480
481 assert(link);
482 assert(link->network);
483 assert(link->state != _LINK_STATE_INVALID);
484
485 r = link_request_static_addresses(link);
486 if (r < 0)
487 return r;
488
489 r = link_request_static_address_labels(link);
490 if (r < 0)
491 return r;
492
493 r = link_request_static_bridge_fdb(link);
494 if (r < 0)
495 return r;
496
497 r = link_request_static_bridge_mdb(link);
498 if (r < 0)
499 return r;
500
501 r = link_request_static_ipv6_proxy_ndp_addresses(link);
502 if (r < 0)
503 return r;
504
505 r = link_request_static_neighbors(link);
506 if (r < 0)
507 return r;
508
509 r = link_request_static_nexthops(link, false);
510 if (r < 0)
511 return r;
512
513 r = link_request_static_routes(link, false);
514 if (r < 0)
515 return r;
516
517 r = link_request_static_routing_policy_rules(link);
518 if (r < 0)
519 return r;
520
521 return 0;
522 }
523
524 static int link_request_stacked_netdevs(Link *link) {
525 NetDev *netdev;
526 int r;
527
528 assert(link);
529
530 link->stacked_netdevs_created = false;
531
532 HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) {
533 r = link_request_stacked_netdev(link, netdev);
534 if (r < 0)
535 return r;
536 }
537
538 if (link->create_stacked_netdev_messages == 0) {
539 link->stacked_netdevs_created = true;
540 link_check_ready(link);
541 }
542
543 return 0;
544 }
545
546 static int link_acquire_dynamic_ipv6_conf(Link *link) {
547 int r;
548
549 assert(link);
550
551 r = radv_start(link);
552 if (r < 0)
553 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Advertisement engine: %m");
554
555 r = ndisc_start(link);
556 if (r < 0)
557 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Discovery: %m");
558
559 r = dhcp6_start(link);
560 if (r < 0)
561 return log_link_warning_errno(link, r, "Failed to start DHCPv6 client: %m");
562
563 return 0;
564 }
565
566 static int link_acquire_dynamic_ipv4_conf(Link *link) {
567 int r;
568
569 assert(link);
570 assert(link->manager);
571 assert(link->manager->event);
572
573 if (link->dhcp_client) {
574 r = dhcp4_start(link);
575 if (r < 0)
576 return log_link_warning_errno(link, r, "Failed to start DHCPv4 client: %m");
577
578 log_link_debug(link, "Acquiring DHCPv4 lease.");
579
580 } else if (link->ipv4ll) {
581 if (in4_addr_is_set(&link->network->ipv4ll_start_address)) {
582 r = sd_ipv4ll_set_address(link->ipv4ll, &link->network->ipv4ll_start_address);
583 if (r < 0)
584 return log_link_warning_errno(link, r, "Could not set IPv4 link-local start address: %m");
585 }
586
587 r = sd_ipv4ll_start(link->ipv4ll);
588 if (r < 0)
589 return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
590
591 log_link_debug(link, "Acquiring IPv4 link-local address.");
592 }
593
594 if (link->dhcp_server) {
595 r = sd_dhcp_server_start(link->dhcp_server);
596 if (r < 0)
597 return log_link_warning_errno(link, r, "Could not start DHCP server: %m");
598 }
599
600 r = ipv4acd_start(link);
601 if (r < 0)
602 return log_link_warning_errno(link, r, "Could not start IPv4 ACD client: %m");
603
604 return 0;
605 }
606
607 static int link_acquire_dynamic_conf(Link *link) {
608 int r;
609
610 assert(link);
611 assert(link->network);
612
613 r = link_acquire_dynamic_ipv4_conf(link);
614 if (r < 0)
615 return r;
616
617 if (in6_addr_is_set(&link->ipv6ll_address)) {
618 r = link_acquire_dynamic_ipv6_conf(link);
619 if (r < 0)
620 return r;
621 }
622
623 if (!link_radv_enabled(link) || !link->network->dhcp_pd_announce) {
624 /* DHCPv6PD downstream does not require IPv6LL address. But may require RADV to be
625 * configured, and RADV may not be configured yet here. Only acquire subnet prefix when
626 * RADV is disabled, or the announcement of the prefix is disabled. Otherwise, the
627 * below will be called in radv_start(). */
628 r = dhcp_request_prefix_delegation(link);
629 if (r < 0)
630 return log_link_warning_errno(link, r, "Failed to request DHCP delegated subnet prefix: %m");
631 }
632
633 if (link->lldp_tx) {
634 r = sd_lldp_tx_start(link->lldp_tx);
635 if (r < 0)
636 return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
637 }
638
639 if (link->lldp_rx) {
640 r = sd_lldp_rx_start(link->lldp_rx);
641 if (r < 0)
642 return log_link_warning_errno(link, r, "Failed to start LLDP client: %m");
643 }
644
645 return 0;
646 }
647
648 int link_ipv6ll_gained(Link *link) {
649 int r;
650
651 assert(link);
652
653 log_link_info(link, "Gained IPv6LL");
654
655 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
656 return 0;
657
658 r = link_acquire_dynamic_ipv6_conf(link);
659 if (r < 0)
660 return r;
661
662 link_check_ready(link);
663 return 0;
664 }
665
666 int link_handle_bound_to_list(Link *link) {
667 bool required_up = false;
668 bool link_is_up = false;
669 Link *l;
670
671 assert(link);
672
673 /* If at least one interface in bound_to_links has carrier, then make this interface up.
674 * If all interfaces in bound_to_links do not, then make this interface down. */
675
676 if (hashmap_isempty(link->bound_to_links))
677 return 0;
678
679 if (link->flags & IFF_UP)
680 link_is_up = true;
681
682 HASHMAP_FOREACH(l, link->bound_to_links)
683 if (link_has_carrier(l)) {
684 required_up = true;
685 break;
686 }
687
688 if (!required_up && link_is_up)
689 return link_request_to_bring_up_or_down(link, /* up = */ false);
690 if (required_up && !link_is_up)
691 return link_request_to_bring_up_or_down(link, /* up = */ true);
692
693 return 0;
694 }
695
696 static int link_handle_bound_by_list(Link *link) {
697 Link *l;
698 int r;
699
700 assert(link);
701
702 /* Update up or down state of interfaces which depend on this interface's carrier state. */
703
704 if (hashmap_isempty(link->bound_by_links))
705 return 0;
706
707 HASHMAP_FOREACH(l, link->bound_by_links) {
708 r = link_handle_bound_to_list(l);
709 if (r < 0)
710 return r;
711 }
712
713 return 0;
714 }
715
716 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
717 int r;
718
719 assert(link);
720 assert(carrier);
721
722 if (link == carrier)
723 return 0;
724
725 if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
726 return 0;
727
728 r = hashmap_ensure_put(h, NULL, INT_TO_PTR(carrier->ifindex), carrier);
729 if (r < 0)
730 return r;
731
732 link_dirty(link);
733
734 return 0;
735 }
736
737 static int link_new_bound_by_list(Link *link) {
738 Manager *m;
739 Link *carrier;
740 int r;
741
742 assert(link);
743 assert(link->manager);
744
745 m = link->manager;
746
747 HASHMAP_FOREACH(carrier, m->links_by_index) {
748 if (!carrier->network)
749 continue;
750
751 if (strv_isempty(carrier->network->bind_carrier))
752 continue;
753
754 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
755 r = link_put_carrier(link, carrier, &link->bound_by_links);
756 if (r < 0)
757 return r;
758 }
759 }
760
761 HASHMAP_FOREACH(carrier, link->bound_by_links) {
762 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
763 if (r < 0)
764 return r;
765 }
766
767 return 0;
768 }
769
770 static int link_new_bound_to_list(Link *link) {
771 Manager *m;
772 Link *carrier;
773 int r;
774
775 assert(link);
776 assert(link->manager);
777
778 if (!link->network)
779 return 0;
780
781 if (strv_isempty(link->network->bind_carrier))
782 return 0;
783
784 m = link->manager;
785
786 HASHMAP_FOREACH(carrier, m->links_by_index) {
787 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
788 r = link_put_carrier(link, carrier, &link->bound_to_links);
789 if (r < 0)
790 return r;
791 }
792 }
793
794 HASHMAP_FOREACH(carrier, link->bound_to_links) {
795 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
796 if (r < 0)
797 return r;
798 }
799
800 return 0;
801 }
802
803 static void link_free_bound_to_list(Link *link) {
804 bool updated = false;
805 Link *bound_to;
806
807 assert(link);
808
809 while ((bound_to = hashmap_steal_first(link->bound_to_links))) {
810 updated = true;
811
812 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
813 link_dirty(bound_to);
814 }
815
816 if (updated)
817 link_dirty(link);
818 }
819
820 static void link_free_bound_by_list(Link *link) {
821 bool updated = false;
822 Link *bound_by;
823
824 assert(link);
825
826 while ((bound_by = hashmap_steal_first(link->bound_by_links))) {
827 updated = true;
828
829 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
830 link_dirty(bound_by);
831 link_handle_bound_to_list(bound_by);
832 }
833 }
834
835 if (updated)
836 link_dirty(link);
837 }
838
839 static int link_append_to_master(Link *link) {
840 Link *master;
841 int r;
842
843 assert(link);
844
845 /* - The link may have no master.
846 * - RTM_NEWLINK message about master interface may not be received yet. */
847 if (link_get_master(link, &master) < 0)
848 return 0;
849
850 r = set_ensure_put(&master->slaves, NULL, link);
851 if (r <= 0)
852 return r;
853
854 link_ref(link);
855 return 0;
856 }
857
858 static void link_drop_from_master(Link *link) {
859 Link *master;
860
861 assert(link);
862
863 if (!link->manager)
864 return;
865
866 if (link_get_master(link, &master) < 0)
867 return;
868
869 link_unref(set_remove(master->slaves, link));
870 }
871
872 static void link_drop_requests(Link *link) {
873 Request *req;
874
875 assert(link);
876 assert(link->manager);
877
878 ORDERED_SET_FOREACH(req, link->manager->request_queue)
879 if (req->link == link)
880 request_detach(link->manager, req);
881 }
882
883 static Link *link_drop(Link *link) {
884 if (!link)
885 return NULL;
886
887 assert(link->manager);
888
889 link_set_state(link, LINK_STATE_LINGER);
890
891 /* Drop all references from other links and manager. Note that async netlink calls may have
892 * references to the link, and they will be dropped when we receive replies. */
893
894 link_drop_requests(link);
895
896 link_free_bound_to_list(link);
897 link_free_bound_by_list(link);
898
899 link_clear_sr_iov_ifindices(link);
900
901 link_drop_from_master(link);
902
903 if (link->state_file)
904 (void) unlink(link->state_file);
905
906 link_clean(link);
907
908 STRV_FOREACH(n, link->alternative_names)
909 hashmap_remove(link->manager->links_by_name, *n);
910 hashmap_remove(link->manager->links_by_name, link->ifname);
911
912 /* bonding master and its slaves have the same hardware address. */
913 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
914
915 /* The following must be called at last. */
916 assert_se(hashmap_remove(link->manager->links_by_index, INT_TO_PTR(link->ifindex)) == link);
917 return link_unref(link);
918 }
919
920 static int link_drop_foreign_config(Link *link) {
921 int k, r;
922
923 assert(link);
924 assert(link->manager);
925
926 /* Drop foreign config, but ignore unmanaged, loopback, or critical interfaces. We do not want
927 * to remove loopback address or addresses used for root NFS. */
928
929 if (IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
930 return 0;
931 if (FLAGS_SET(link->flags, IFF_LOOPBACK))
932 return 0;
933 if (link->network->keep_configuration == KEEP_CONFIGURATION_YES)
934 return 0;
935
936 r = link_drop_foreign_routes(link);
937
938 k = link_drop_foreign_nexthops(link);
939 if (k < 0 && r >= 0)
940 r = k;
941
942 k = link_drop_foreign_addresses(link);
943 if (k < 0 && r >= 0)
944 r = k;
945
946 k = link_drop_foreign_neighbors(link);
947 if (k < 0 && r >= 0)
948 r = k;
949
950 k = manager_drop_foreign_routing_policy_rules(link->manager);
951 if (k < 0 && r >= 0)
952 r = k;
953
954 return r;
955 }
956
957 static int link_drop_managed_config(Link *link) {
958 int k, r;
959
960 assert(link);
961 assert(link->manager);
962
963 r = link_drop_managed_routes(link);
964
965 k = link_drop_managed_nexthops(link);
966 if (k < 0 && r >= 0)
967 r = k;
968
969 k = link_drop_managed_addresses(link);
970 if (k < 0 && r >= 0)
971 r = k;
972
973 k = link_drop_managed_neighbors(link);
974 if (k < 0 && r >= 0)
975 r = k;
976
977 k = link_drop_managed_routing_policy_rules(link);
978 if (k < 0 && r >= 0)
979 r = k;
980
981 return r;
982 }
983
984 static void link_foreignize_config(Link *link) {
985 assert(link);
986 assert(link->manager);
987
988 link_foreignize_routes(link);
989 link_foreignize_nexthops(link);
990 link_foreignize_addresses(link);
991 link_foreignize_neighbors(link);
992 link_foreignize_routing_policy_rules(link);
993 }
994
995 static int link_configure(Link *link) {
996 int r;
997
998 assert(link);
999 assert(link->network);
1000 assert(link->state == LINK_STATE_INITIALIZED);
1001
1002 link_set_state(link, LINK_STATE_CONFIGURING);
1003
1004 r = link_new_bound_to_list(link);
1005 if (r < 0)
1006 return r;
1007
1008 r = link_request_traffic_control(link);
1009 if (r < 0)
1010 return r;
1011
1012 if (link->iftype == ARPHRD_CAN) {
1013 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1014 r = link_request_to_set_can(link);
1015 if (r < 0)
1016 return r;
1017
1018 return link_request_to_activate(link);
1019 }
1020
1021 r = link_request_sr_iov_vfs(link);
1022 if (r < 0)
1023 return r;
1024
1025 r = link_set_sysctl(link);
1026 if (r < 0)
1027 return r;
1028
1029 r = link_request_to_set_mac(link, /* allow_retry = */ true);
1030 if (r < 0)
1031 return r;
1032
1033 r = link_request_to_set_ipoib(link);
1034 if (r < 0)
1035 return r;
1036
1037 r = link_request_to_set_flags(link);
1038 if (r < 0)
1039 return r;
1040
1041 r = link_request_to_set_group(link);
1042 if (r < 0)
1043 return r;
1044
1045 r = link_configure_mtu(link);
1046 if (r < 0)
1047 return r;
1048
1049 r = link_request_to_set_addrgen_mode(link);
1050 if (r < 0)
1051 return r;
1052
1053 r = link_request_to_set_master(link);
1054 if (r < 0)
1055 return r;
1056
1057 r = link_request_stacked_netdevs(link);
1058 if (r < 0)
1059 return r;
1060
1061 r = link_request_to_set_bond(link);
1062 if (r < 0)
1063 return r;
1064
1065 r = link_request_to_set_bridge(link);
1066 if (r < 0)
1067 return r;
1068
1069 r = link_request_to_set_bridge_vlan(link);
1070 if (r < 0)
1071 return r;
1072
1073 r = link_request_to_activate(link);
1074 if (r < 0)
1075 return r;
1076
1077 r = ipv4ll_configure(link);
1078 if (r < 0)
1079 return r;
1080
1081 r = link_request_dhcp4_client(link);
1082 if (r < 0)
1083 return r;
1084
1085 r = link_request_dhcp6_client(link);
1086 if (r < 0)
1087 return r;
1088
1089 r = link_request_ndisc(link);
1090 if (r < 0)
1091 return r;
1092
1093 r = link_request_dhcp_server(link);
1094 if (r < 0)
1095 return r;
1096
1097 r = link_request_radv(link);
1098 if (r < 0)
1099 return r;
1100
1101 r = link_lldp_rx_configure(link);
1102 if (r < 0)
1103 return r;
1104
1105 r = link_lldp_tx_configure(link);
1106 if (r < 0)
1107 return r;
1108
1109 r = link_drop_foreign_config(link);
1110 if (r < 0)
1111 return r;
1112
1113 r = link_request_static_configs(link);
1114 if (r < 0)
1115 return r;
1116
1117 if (!link_has_carrier(link))
1118 return 0;
1119
1120 return link_acquire_dynamic_conf(link);
1121 }
1122
1123 static int link_get_network(Link *link, Network **ret) {
1124 Network *network;
1125 int r;
1126
1127 assert(link);
1128 assert(link->manager);
1129 assert(ret);
1130
1131 ORDERED_HASHMAP_FOREACH(network, link->manager->networks) {
1132 bool warn = false;
1133
1134 r = net_match_config(
1135 &network->match,
1136 link->dev,
1137 &link->hw_addr,
1138 &link->permanent_hw_addr,
1139 link->driver,
1140 link->iftype,
1141 link->kind,
1142 link->ifname,
1143 link->alternative_names,
1144 link->wlan_iftype,
1145 link->ssid,
1146 &link->bssid);
1147 if (r < 0)
1148 return r;
1149 if (r == 0)
1150 continue;
1151
1152 if (network->match.ifname && link->dev) {
1153 uint8_t name_assign_type = NET_NAME_UNKNOWN;
1154 const char *attr;
1155
1156 if (sd_device_get_sysattr_value(link->dev, "name_assign_type", &attr) >= 0)
1157 (void) safe_atou8(attr, &name_assign_type);
1158
1159 warn = name_assign_type == NET_NAME_ENUM;
1160 }
1161
1162 log_link_full(link, warn ? LOG_WARNING : LOG_DEBUG,
1163 "found matching network '%s'%s.",
1164 network->filename,
1165 warn ? ", based on potentially unpredictable interface name" : "");
1166
1167 if (network->unmanaged)
1168 return -ENOENT;
1169
1170 *ret = network;
1171 return 0;
1172 }
1173
1174 return -ENOENT;
1175 }
1176
1177 static int link_reconfigure_impl(Link *link, bool force) {
1178 Network *network = NULL;
1179 NetDev *netdev = NULL;
1180 int r;
1181
1182 assert(link);
1183
1184 if (!IN_SET(link->state, LINK_STATE_INITIALIZED, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED, LINK_STATE_UNMANAGED))
1185 return 0;
1186
1187 r = netdev_get(link->manager, link->ifname, &netdev);
1188 if (r < 0 && r != -ENOENT)
1189 return r;
1190
1191 r = link_get_network(link, &network);
1192 if (r < 0 && r != -ENOENT)
1193 return r;
1194
1195 if (link->state != LINK_STATE_UNMANAGED && !network)
1196 /* If link is in initialized state, then link->network is also NULL. */
1197 force = true;
1198
1199 if (link->network == network && !force)
1200 return 0;
1201
1202 if (network) {
1203 if (link->state == LINK_STATE_INITIALIZED)
1204 log_link_info(link, "Configuring with %s.", network->filename);
1205 else
1206 log_link_info(link, "Reconfiguring with %s.", network->filename);
1207 } else
1208 log_link_full(link, link->state == LINK_STATE_INITIALIZED ? LOG_DEBUG : LOG_INFO,
1209 "Unmanaging interface.");
1210
1211 /* Dropping old .network file */
1212 r = link_stop_engines(link, false);
1213 if (r < 0)
1214 return r;
1215
1216 link_drop_requests(link);
1217
1218 if (network && !force && network->keep_configuration != KEEP_CONFIGURATION_YES)
1219 /* When a new/updated .network file is assigned, first make all configs (addresses,
1220 * routes, and so on) foreign, and then drop unnecessary configs later by
1221 * link_drop_foreign_config() in link_configure().
1222 * Note, when KeepConfiguration=yes, link_drop_foreign_config() does nothing. Hence,
1223 * here we need to drop the configs such as addresses, routes, and so on configured by
1224 * the previously assigned .network file. */
1225 link_foreignize_config(link);
1226 else {
1227 /* Remove all managed configs. Note, foreign configs are removed in later by
1228 * link_configure() -> link_drop_foreign_config() if the link is managed by us. */
1229 r = link_drop_managed_config(link);
1230 if (r < 0)
1231 return r;
1232 }
1233
1234 /* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the
1235 * bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will
1236 * not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the
1237 * map here, as it depends on .network files assigned to other links. */
1238 link_free_bound_to_list(link);
1239
1240 link_free_engines(link);
1241 link->network = network_unref(link->network);
1242
1243 netdev_unref(link->netdev);
1244 link->netdev = netdev_ref(netdev);
1245
1246 if (!network) {
1247 link_set_state(link, LINK_STATE_UNMANAGED);
1248 return 0;
1249 }
1250
1251 /* Then, apply new .network file */
1252 link->network = network_ref(network);
1253 link_update_operstate(link, true);
1254 link_dirty(link);
1255
1256 link_set_state(link, LINK_STATE_INITIALIZED);
1257 link->activated = false;
1258
1259 r = link_configure(link);
1260 if (r < 0)
1261 return r;
1262
1263 return 1;
1264 }
1265
1266 static int link_reconfigure_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, bool force) {
1267 int r;
1268
1269 assert(link);
1270
1271 r = link_getlink_handler_internal(rtnl, m, link, "Failed to update link state");
1272 if (r <= 0)
1273 return r;
1274
1275 r = link_reconfigure_impl(link, force);
1276 if (r < 0) {
1277 link_enter_failed(link);
1278 return 0;
1279 }
1280
1281 return r;
1282 }
1283
1284 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1285 return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ false);
1286 }
1287
1288 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1289 return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ true);
1290 }
1291
1292 static int link_reconfigure_after_sleep_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1293 int r;
1294
1295 assert(link);
1296
1297 r = link_reconfigure_handler_internal(rtnl, m, link, /* force = */ false);
1298 if (r != 0)
1299 return r;
1300
1301 /* r == 0 means an error occurs, the link is unmanaged, or the matching network file is unchanged. */
1302 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
1303 return 0;
1304
1305 /* re-request static configs, and restart engines. */
1306 r = link_stop_engines(link, false);
1307 if (r < 0) {
1308 link_enter_failed(link);
1309 return 0;
1310 }
1311
1312 r = link_acquire_dynamic_conf(link);
1313 if (r < 0) {
1314 link_enter_failed(link);
1315 return 0;
1316 }
1317
1318 r = link_request_static_configs(link);
1319 if (r < 0) {
1320 link_enter_failed(link);
1321 return 0;
1322 }
1323
1324 return 0;
1325 }
1326
1327 static int link_reconfigure_internal(Link *link, link_netlink_message_handler_t callback) {
1328 int r;
1329
1330 assert(link);
1331 assert(callback);
1332
1333 /* When link in pending or initialized state, then link_configure() will be called. To prevent
1334 * the function from being called multiple times simultaneously, refuse to reconfigure the
1335 * interface in these cases. */
1336 if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
1337 return 0; /* 0 means no-op. */
1338
1339 r = link_call_getlink(link, callback);
1340 if (r < 0)
1341 return r;
1342
1343 return 1; /* 1 means the interface will be reconfigured. */
1344 }
1345
1346 int link_reconfigure(Link *link, bool force) {
1347 return link_reconfigure_internal(link, force ? link_force_reconfigure_handler : link_reconfigure_handler);
1348 }
1349
1350 int link_reconfigure_after_sleep(Link *link) {
1351 return link_reconfigure_internal(link, link_reconfigure_after_sleep_handler);
1352 }
1353
1354 static int link_initialized_and_synced(Link *link) {
1355 int r;
1356
1357 assert(link);
1358 assert(link->manager);
1359
1360 if (link->manager->test_mode) {
1361 log_link_debug(link, "Running in test mode, refusing to enter initialized state.");
1362 link_set_state(link, LINK_STATE_UNMANAGED);
1363 return 0;
1364 }
1365
1366 /* This may get called either from the asynchronous netlink callback,
1367 * or directly from link_check_initialized() if running in a container. */
1368 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
1369 return 0;
1370
1371 log_link_debug(link, "Link state is up-to-date");
1372 link_set_state(link, LINK_STATE_INITIALIZED);
1373
1374 r = link_new_bound_by_list(link);
1375 if (r < 0)
1376 return r;
1377
1378 r = link_handle_bound_by_list(link);
1379 if (r < 0)
1380 return r;
1381
1382 return link_reconfigure_impl(link, /* force = */ false);
1383 }
1384
1385 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1386 int r;
1387
1388 r = link_getlink_handler_internal(rtnl, m, link, "Failed to wait for the interface to be initialized");
1389 if (r <= 0)
1390 return r;
1391
1392 r = link_initialized_and_synced(link);
1393 if (r < 0)
1394 link_enter_failed(link);
1395
1396 return 0;
1397 }
1398
1399 static int link_initialized(Link *link, sd_device *device) {
1400 int r;
1401
1402 assert(link);
1403 assert(device);
1404
1405 /* Always replace with the new sd_device object. As the sysname (and possibly other properties
1406 * or sysattrs) may be outdated. */
1407 device_unref_and_replace(link->dev, device);
1408
1409 r = link_set_sr_iov_ifindices(link);
1410 if (r < 0)
1411 log_link_warning_errno(link, r, "Failed to manage SR-IOV PF and VF ports, ignoring: %m");
1412
1413 /* Do not ignore unamanaged state case here. If an interface is renamed after being once
1414 * configured, and the corresponding .network file has Name= in [Match] section, then the
1415 * interface may be already in unmanaged state. See #20657. */
1416 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED))
1417 return 0;
1418
1419 log_link_debug(link, "udev initialized link");
1420 link_set_state(link, LINK_STATE_INITIALIZED);
1421
1422 /* udev has initialized the link, but we don't know if we have yet
1423 * processed the NEWLINK messages with the latest state. Do a GETLINK,
1424 * when it returns we know that the pending NEWLINKs have already been
1425 * processed and that we are up-to-date */
1426
1427 return link_call_getlink(link, link_initialized_handler);
1428 }
1429
1430 static int link_check_initialized(Link *link) {
1431 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
1432 int r;
1433
1434 assert(link);
1435
1436 if (!udev_available())
1437 return link_initialized_and_synced(link);
1438
1439 /* udev should be around */
1440 r = sd_device_new_from_ifindex(&device, link->ifindex);
1441 if (r < 0) {
1442 log_link_debug_errno(link, r, "Could not find device, waiting for device initialization: %m");
1443 return 0;
1444 }
1445
1446 r = sd_device_get_is_initialized(device);
1447 if (r < 0)
1448 return log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
1449 if (r == 0) {
1450 /* not yet ready */
1451 log_link_debug(link, "link pending udev initialization...");
1452 return 0;
1453 }
1454
1455 r = device_is_renaming(device);
1456 if (r < 0)
1457 return log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
1458 if (r > 0) {
1459 log_link_debug(link, "Interface is being renamed, pending initialization.");
1460 return 0;
1461 }
1462
1463 return link_initialized(link, device);
1464 }
1465
1466 int manager_udev_process_link(Manager *m, sd_device *device, sd_device_action_t action) {
1467 int r, ifindex;
1468 Link *link;
1469
1470 assert(m);
1471 assert(device);
1472
1473 r = sd_device_get_ifindex(device, &ifindex);
1474 if (r < 0)
1475 return log_device_debug_errno(device, r, "Failed to get ifindex: %m");
1476
1477 r = link_get_by_index(m, ifindex, &link);
1478 if (r < 0) {
1479 /* This error is not critical, as the corresponding rtnl message may be received later. */
1480 log_device_debug_errno(device, r, "Failed to get link from ifindex %i, ignoring: %m", ifindex);
1481 return 0;
1482 }
1483
1484 /* Let's unref the sd-device object assigned to the corresponding Link object, but keep the Link
1485 * object here. It will be removed only when rtnetlink says so. */
1486 if (action == SD_DEVICE_REMOVE) {
1487 link->dev = sd_device_unref(link->dev);
1488 return 0;
1489 }
1490
1491 r = device_is_renaming(device);
1492 if (r < 0)
1493 return log_device_debug_errno(device, r, "Failed to determine if the device is renaming or not: %m");
1494 if (r > 0) {
1495 log_device_debug(device, "Device is renaming, waiting for the interface to be renamed.");
1496 /* TODO:
1497 * What happens when a device is initialized, then soon renamed after that? When we detect
1498 * such, maybe we should cancel or postpone all queued requests for the interface. */
1499 return 0;
1500 }
1501
1502 r = link_initialized(link, device);
1503 if (r < 0)
1504 link_enter_failed(link);
1505
1506 return 0;
1507 }
1508
1509 static int link_carrier_gained(Link *link) {
1510 bool force_reconfigure;
1511 int r;
1512
1513 assert(link);
1514
1515 r = event_source_disable(link->carrier_lost_timer);
1516 if (r < 0)
1517 log_link_warning_errno(link, r, "Failed to disable carrier lost timer, ignoring: %m");
1518
1519 /* If a wireless interface was connected to an access point, and the SSID is changed (that is,
1520 * both previous_ssid and ssid are non-NULL), then the connected wireless network could be
1521 * changed. So, always reconfigure the link. Which means e.g. the DHCP client will be
1522 * restarted, and the correct network information will be gained.
1523 *
1524 * However, do not reconfigure the wireless interface forcibly if it was not connected to any
1525 * access points previously (previous_ssid is NULL in this case). As, a .network file may be
1526 * already assigned to the interface (in that case, the .network file does not have the SSID=
1527 * setting in the [Match] section), and the interface is already being configured. Of course,
1528 * there may exist another .network file with higher priority and a matching SSID= setting. But
1529 * in that case, link_reconfigure_impl() can handle that without the force_reconfigure flag.
1530 *
1531 * For non-wireless interfaces, we have no way to detect the connected network change. So,
1532 * setting force_reconfigure = false. Note, both ssid and previous_ssid are NULL in that case. */
1533 force_reconfigure = link->previous_ssid && !streq_ptr(link->previous_ssid, link->ssid);
1534 link->previous_ssid = mfree(link->previous_ssid);
1535
1536 if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_FAILED, LINK_STATE_LINGER)) {
1537 /* At this stage, both wlan and link information should be up-to-date. Hence,
1538 * it is not necessary to call RTM_GETLINK, NL80211_CMD_GET_INTERFACE, or
1539 * NL80211_CMD_GET_STATION commands, and simply call link_reconfigure_impl().
1540 * Note, link_reconfigure_impl() returns 1 when the link is reconfigured. */
1541 r = link_reconfigure_impl(link, force_reconfigure);
1542 if (r != 0)
1543 return r;
1544 }
1545
1546 r = link_handle_bound_by_list(link);
1547 if (r < 0)
1548 return r;
1549
1550 if (link->iftype == ARPHRD_CAN)
1551 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1552 return 0;
1553
1554 if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
1555 r = link_acquire_dynamic_conf(link);
1556 if (r < 0)
1557 return r;
1558
1559 r = link_request_static_configs(link);
1560 if (r < 0)
1561 return r;
1562 }
1563
1564 return 0;
1565 }
1566
1567 static int link_carrier_lost_impl(Link *link) {
1568 int r, ret = 0;
1569
1570 assert(link);
1571
1572 link->previous_ssid = mfree(link->previous_ssid);
1573
1574 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1575 return 0;
1576
1577 if (!link->network)
1578 return 0;
1579
1580 r = link_stop_engines(link, false);
1581 if (r < 0)
1582 ret = r;
1583
1584 r = link_drop_managed_config(link);
1585 if (r < 0 && ret >= 0)
1586 ret = r;
1587
1588 return ret;
1589 }
1590
1591 static int link_carrier_lost_handler(sd_event_source *s, uint64_t usec, void *userdata) {
1592 Link *link = ASSERT_PTR(userdata);
1593 int r;
1594
1595 r = link_carrier_lost_impl(link);
1596 if (r < 0) {
1597 log_link_warning_errno(link, r, "Failed to process carrier lost event: %m");
1598 link_enter_failed(link);
1599 }
1600
1601 return 0;
1602 }
1603
1604 static int link_carrier_lost(Link *link) {
1605 uint16_t dhcp_mtu;
1606 usec_t usec;
1607 int r;
1608
1609 assert(link);
1610
1611 r = link_handle_bound_by_list(link);
1612 if (r < 0)
1613 return r;
1614
1615 if (link->iftype == ARPHRD_CAN)
1616 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1617 return 0;
1618
1619 if (!link->network)
1620 return 0;
1621
1622 if (link->network->ignore_carrier_loss_set)
1623 /* If IgnoreCarrierLoss= is explicitly specified, then use the specified value. */
1624 usec = link->network->ignore_carrier_loss_usec;
1625
1626 else if (link->network->bond && link->wlan_iftype > 0)
1627 /* Enslaving wlan interface to a bond disconnects from the connected AP, and causes its
1628 * carrier to be lost. See #19832. */
1629 usec = 3 * USEC_PER_SEC;
1630
1631 else if (link->network->dhcp_use_mtu &&
1632 link->dhcp_lease &&
1633 sd_dhcp_lease_get_mtu(link->dhcp_lease, &dhcp_mtu) >= 0 &&
1634 dhcp_mtu != link->original_mtu)
1635 /* Some drivers reset interfaces when changing MTU. Resetting interfaces by the static
1636 * MTU should not cause any issues, as MTU is changed only once. However, setting MTU
1637 * through DHCP lease causes an infinite loop of resetting the interface. See #18738. */
1638 usec = 5 * USEC_PER_SEC;
1639
1640 else
1641 /* Otherwise, use the currently set value. */
1642 usec = link->network->ignore_carrier_loss_usec;
1643
1644 if (usec == USEC_INFINITY)
1645 return 0;
1646
1647 if (usec == 0)
1648 return link_carrier_lost_impl(link);
1649
1650 return event_reset_time_relative(link->manager->event,
1651 &link->carrier_lost_timer,
1652 CLOCK_BOOTTIME,
1653 usec,
1654 0,
1655 link_carrier_lost_handler,
1656 link,
1657 0,
1658 "link-carrier-loss",
1659 true);
1660 }
1661
1662 static int link_admin_state_up(Link *link) {
1663 int r;
1664
1665 assert(link);
1666
1667 /* This is called every time an interface admin state changes to up;
1668 * specifically, when IFF_UP flag changes from unset to set. */
1669
1670 if (!link->network)
1671 return 0;
1672
1673 if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_DOWN) {
1674 log_link_info(link, "Activation policy is \"always-down\", forcing link down.");
1675 return link_request_to_bring_up_or_down(link, /* up = */ false);
1676 }
1677
1678 /* We set the ipv6 mtu after the device mtu, but the kernel resets
1679 * ipv6 mtu on NETDEV_UP, so we need to reset it. */
1680 r = link_set_ipv6_mtu(link);
1681 if (r < 0)
1682 log_link_warning_errno(link, r, "Cannot set IPv6 MTU, ignoring: %m");
1683
1684 return 0;
1685 }
1686
1687 static int link_admin_state_down(Link *link) {
1688 assert(link);
1689
1690 if (!link->network)
1691 return 0;
1692
1693 if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) {
1694 log_link_info(link, "Activation policy is \"always-up\", forcing link up.");
1695 return link_request_to_bring_up_or_down(link, /* up = */ true);
1696 }
1697
1698 return 0;
1699 }
1700
1701 static bool link_is_enslaved(Link *link) {
1702 if (link->flags & IFF_SLAVE)
1703 return true;
1704
1705 if (link->master_ifindex > 0)
1706 return true;
1707
1708 return false;
1709 }
1710
1711 static LinkAddressState address_state_from_scope(uint8_t scope) {
1712 if (scope < RT_SCOPE_SITE)
1713 /* universally accessible addresses found */
1714 return LINK_ADDRESS_STATE_ROUTABLE;
1715
1716 if (scope < RT_SCOPE_HOST)
1717 /* only link or site local addresses found */
1718 return LINK_ADDRESS_STATE_DEGRADED;
1719
1720 /* no useful addresses found */
1721 return LINK_ADDRESS_STATE_OFF;
1722 }
1723
1724 void link_update_operstate(Link *link, bool also_update_master) {
1725 LinkOperationalState operstate;
1726 LinkCarrierState carrier_state;
1727 LinkAddressState ipv4_address_state, ipv6_address_state, address_state;
1728 LinkOnlineState online_state;
1729 _cleanup_strv_free_ char **p = NULL;
1730 uint8_t ipv4_scope = RT_SCOPE_NOWHERE, ipv6_scope = RT_SCOPE_NOWHERE;
1731 bool changed = false;
1732 Address *address;
1733
1734 assert(link);
1735
1736 if (link->kernel_operstate == IF_OPER_DORMANT)
1737 carrier_state = LINK_CARRIER_STATE_DORMANT;
1738 else if (link_has_carrier(link)) {
1739 if (link_is_enslaved(link))
1740 carrier_state = LINK_CARRIER_STATE_ENSLAVED;
1741 else
1742 carrier_state = LINK_CARRIER_STATE_CARRIER;
1743 } else if (link->flags & IFF_UP)
1744 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
1745 else
1746 carrier_state = LINK_CARRIER_STATE_OFF;
1747
1748 if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
1749 Link *slave;
1750
1751 SET_FOREACH(slave, link->slaves) {
1752 link_update_operstate(slave, false);
1753
1754 if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
1755 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
1756 }
1757 }
1758
1759 SET_FOREACH(address, link->addresses) {
1760 if (!address_is_ready(address))
1761 continue;
1762
1763 if (address->family == AF_INET)
1764 ipv4_scope = MIN(ipv4_scope, address->scope);
1765
1766 if (address->family == AF_INET6)
1767 ipv6_scope = MIN(ipv6_scope, address->scope);
1768 }
1769
1770 ipv4_address_state = address_state_from_scope(ipv4_scope);
1771 ipv6_address_state = address_state_from_scope(ipv6_scope);
1772 address_state = address_state_from_scope(MIN(ipv4_scope, ipv6_scope));
1773
1774 /* Mapping of address and carrier state vs operational state
1775 * carrier state
1776 * | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
1777 * ------------------------------------------------------------------------------
1778 * off | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
1779 * address_state degraded | off | no-carrier | dormant | degraded-carrier | degraded | enslaved
1780 * routable | off | no-carrier | dormant | degraded-carrier | routable | routable
1781 */
1782
1783 if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
1784 operstate = (LinkOperationalState) carrier_state;
1785 else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
1786 operstate = LINK_OPERSTATE_ROUTABLE;
1787 else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
1788 operstate = LINK_OPERSTATE_DEGRADED;
1789 else
1790 operstate = LINK_OPERSTATE_ENSLAVED;
1791
1792 /* Only determine online state for managed links with RequiredForOnline=yes */
1793 if (!link->network || !link->network->required_for_online)
1794 online_state = _LINK_ONLINE_STATE_INVALID;
1795 else if (operstate < link->network->required_operstate_for_online.min ||
1796 operstate > link->network->required_operstate_for_online.max)
1797 online_state = LINK_ONLINE_STATE_OFFLINE;
1798 else {
1799 AddressFamily required_family = link->network->required_family_for_online;
1800 bool needs_ipv4 = required_family & ADDRESS_FAMILY_IPV4;
1801 bool needs_ipv6 = required_family & ADDRESS_FAMILY_IPV6;
1802
1803 /* The operational state is within the range required for online.
1804 * If a particular address family is also required, we might revert
1805 * to offline in the blocks below. */
1806 online_state = LINK_ONLINE_STATE_ONLINE;
1807
1808 if (link->network->required_operstate_for_online.min >= LINK_OPERSTATE_DEGRADED) {
1809 if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_DEGRADED)
1810 online_state = LINK_ONLINE_STATE_OFFLINE;
1811 if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_DEGRADED)
1812 online_state = LINK_ONLINE_STATE_OFFLINE;
1813 }
1814
1815 if (link->network->required_operstate_for_online.min >= LINK_OPERSTATE_ROUTABLE) {
1816 if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1817 online_state = LINK_ONLINE_STATE_OFFLINE;
1818 if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1819 online_state = LINK_ONLINE_STATE_OFFLINE;
1820 }
1821 }
1822
1823 if (link->carrier_state != carrier_state) {
1824 link->carrier_state = carrier_state;
1825 changed = true;
1826 if (strv_extend(&p, "CarrierState") < 0)
1827 log_oom();
1828 }
1829
1830 if (link->address_state != address_state) {
1831 link->address_state = address_state;
1832 changed = true;
1833 if (strv_extend(&p, "AddressState") < 0)
1834 log_oom();
1835 }
1836
1837 if (link->ipv4_address_state != ipv4_address_state) {
1838 link->ipv4_address_state = ipv4_address_state;
1839 changed = true;
1840 if (strv_extend(&p, "IPv4AddressState") < 0)
1841 log_oom();
1842 }
1843
1844 if (link->ipv6_address_state != ipv6_address_state) {
1845 link->ipv6_address_state = ipv6_address_state;
1846 changed = true;
1847 if (strv_extend(&p, "IPv6AddressState") < 0)
1848 log_oom();
1849 }
1850
1851 if (link->operstate != operstate) {
1852 link->operstate = operstate;
1853 changed = true;
1854 if (strv_extend(&p, "OperationalState") < 0)
1855 log_oom();
1856 }
1857
1858 if (link->online_state != online_state) {
1859 link->online_state = online_state;
1860 changed = true;
1861 if (strv_extend(&p, "OnlineState") < 0)
1862 log_oom();
1863 }
1864
1865 if (p)
1866 link_send_changed_strv(link, p);
1867 if (changed)
1868 link_dirty(link);
1869
1870 if (also_update_master) {
1871 Link *master;
1872
1873 if (link_get_master(link, &master) >= 0)
1874 link_update_operstate(master, true);
1875 }
1876 }
1877
1878 #define FLAG_STRING(string, flag, old, new) \
1879 (((old ^ new) & flag) \
1880 ? ((old & flag) ? (" -" string) : (" +" string)) \
1881 : "")
1882
1883 static int link_update_flags(Link *link, sd_netlink_message *message) {
1884 bool link_was_admin_up, had_carrier;
1885 uint8_t operstate;
1886 unsigned flags;
1887 int r;
1888
1889 assert(link);
1890 assert(message);
1891
1892 r = sd_rtnl_message_link_get_flags(message, &flags);
1893 if (r < 0)
1894 return log_link_debug_errno(link, r, "rtnl: failed to read link flags: %m");
1895
1896 r = sd_netlink_message_read_u8(message, IFLA_OPERSTATE, &operstate);
1897 if (r == -ENODATA)
1898 /* If we got a message without operstate, assume the state was unchanged. */
1899 operstate = link->kernel_operstate;
1900 else if (r < 0)
1901 return log_link_debug_errno(link, r, "rtnl: failed to read operational state: %m");
1902
1903 if (link->flags == flags && link->kernel_operstate == operstate)
1904 return 0;
1905
1906 if (link->flags != flags) {
1907 unsigned unknown_flags, unknown_flags_added, unknown_flags_removed;
1908
1909 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",
1910 FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
1911 FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
1912 FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
1913 FLAG_STRING("UP", IFF_UP, link->flags, flags),
1914 FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
1915 FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
1916 FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
1917 FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
1918 FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
1919 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
1920 FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
1921 FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
1922 FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
1923 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
1924 FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
1925 FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
1926 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
1927 FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
1928 FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
1929
1930 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
1931 IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
1932 IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
1933 IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
1934 IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
1935 IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
1936 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
1937 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
1938
1939 if (unknown_flags_added)
1940 log_link_debug(link, "Unknown link flags gained, ignoring: %#.5x", unknown_flags_added);
1941
1942 if (unknown_flags_removed)
1943 log_link_debug(link, "Unknown link flags lost, ignoring: %#.5x", unknown_flags_removed);
1944 }
1945
1946 link_was_admin_up = link->flags & IFF_UP;
1947 had_carrier = link_has_carrier(link);
1948
1949 link->flags = flags;
1950 link->kernel_operstate = operstate;
1951
1952 link_update_operstate(link, true);
1953
1954 if (!link_was_admin_up && (link->flags & IFF_UP)) {
1955 log_link_info(link, "Link UP");
1956
1957 r = link_admin_state_up(link);
1958 if (r < 0)
1959 return r;
1960 } else if (link_was_admin_up && !(link->flags & IFF_UP)) {
1961 log_link_info(link, "Link DOWN");
1962
1963 r = link_admin_state_down(link);
1964 if (r < 0)
1965 return r;
1966 }
1967
1968 if (!had_carrier && link_has_carrier(link)) {
1969 log_link_info(link, "Gained carrier");
1970
1971 r = link_carrier_gained(link);
1972 if (r < 0)
1973 return r;
1974 } else if (had_carrier && !link_has_carrier(link)) {
1975 log_link_info(link, "Lost carrier");
1976
1977 r = link_carrier_lost(link);
1978 if (r < 0)
1979 return r;
1980 }
1981
1982 return 0;
1983 }
1984
1985 static int link_update_master(Link *link, sd_netlink_message *message) {
1986 int master_ifindex, r;
1987
1988 assert(link);
1989 assert(message);
1990
1991 r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t*) &master_ifindex);
1992 if (r == -ENODATA)
1993 return 0;
1994 if (r < 0)
1995 return log_link_debug_errno(link, r, "rtnl: failed to read master ifindex: %m");
1996
1997 if (master_ifindex == link->ifindex)
1998 master_ifindex = 0;
1999
2000 if (master_ifindex == link->master_ifindex)
2001 return 0;
2002
2003 if (link->master_ifindex == 0)
2004 log_link_debug(link, "Attached to master interface: %i", master_ifindex);
2005 else if (master_ifindex == 0)
2006 log_link_debug(link, "Detached from master interface: %i", link->master_ifindex);
2007 else
2008 log_link_debug(link, "Master interface changed: %i %s %i", link->master_ifindex,
2009 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), master_ifindex);
2010
2011 link_drop_from_master(link);
2012
2013 link->master_ifindex = master_ifindex;
2014
2015 r = link_append_to_master(link);
2016 if (r < 0)
2017 return log_link_debug_errno(link, r, "Failed to append link to master: %m");
2018
2019 return 0;
2020 }
2021
2022 static int link_update_driver(Link *link, sd_netlink_message *message) {
2023 int r;
2024
2025 assert(link);
2026 assert(link->manager);
2027 assert(message);
2028
2029 /* Driver is already read. Assuming the driver is never changed. */
2030 if (link->driver)
2031 return 0;
2032
2033 /* When udevd is running, read the driver after the interface is initialized by udevd.
2034 * Otherwise, ethtool may not work correctly. See issue #22538.
2035 * When udevd is not running, read the value when the interface is detected. */
2036 if (link->state != (udev_available() ? LINK_STATE_INITIALIZED : LINK_STATE_PENDING))
2037 return 0;
2038
2039 r = ethtool_get_driver(&link->manager->ethtool_fd, link->ifname, &link->driver);
2040 if (r < 0) {
2041 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
2042 return 0;
2043 }
2044
2045 log_link_debug(link, "Found driver: %s", strna(link->driver));
2046
2047 if (streq_ptr(link->driver, "dsa")) {
2048 uint32_t dsa_master_ifindex = 0;
2049
2050 r = sd_netlink_message_read_u32(message, IFLA_LINK, &dsa_master_ifindex);
2051 if (r < 0 && r != -ENODATA)
2052 return log_link_debug_errno(link, r, "rtnl: failed to read ifindex of the DSA master interface: %m");
2053
2054 if (dsa_master_ifindex > INT_MAX) {
2055 log_link_debug(link, "rtnl: received too large DSA master ifindex (%"PRIu32" > INT_MAX), ignoring.",
2056 dsa_master_ifindex);
2057 dsa_master_ifindex = 0;
2058 }
2059
2060 link->dsa_master_ifindex = (int) dsa_master_ifindex;
2061 }
2062
2063 return 0;
2064 }
2065
2066 static int link_update_permanent_hardware_address(Link *link, sd_netlink_message *message) {
2067 int r;
2068
2069 assert(link);
2070 assert(link->manager);
2071 assert(message);
2072
2073 if (link->permanent_hw_addr.length > 0)
2074 return 0;
2075
2076 /* When udevd is running, read the permanent hardware address after the interface is
2077 * initialized by udevd. Otherwise, ethtool may not work correctly. See issue #22538.
2078 * When udevd is not running, read the value when the interface is detected. */
2079 if (link->state != (udev_available() ? LINK_STATE_INITIALIZED : LINK_STATE_PENDING))
2080 return 0;
2081
2082 r = netlink_message_read_hw_addr(message, IFLA_PERM_ADDRESS, &link->permanent_hw_addr);
2083 if (r < 0) {
2084 if (r != -ENODATA)
2085 return log_link_debug_errno(link, r, "Failed to read IFLA_PERM_ADDRESS attribute: %m");
2086
2087 if (netlink_message_read_hw_addr(message, IFLA_ADDRESS, NULL) >= 0) {
2088 /* Fallback to ethtool, if the link has a hardware address. */
2089 r = ethtool_get_permanent_hw_addr(&link->manager->ethtool_fd, link->ifname, &link->permanent_hw_addr);
2090 if (r < 0)
2091 log_link_debug_errno(link, r, "Permanent hardware address not found, continuing without: %m");
2092 }
2093 }
2094
2095 if (link->permanent_hw_addr.length > 0)
2096 log_link_debug(link, "Saved permanent hardware address: %s", HW_ADDR_TO_STR(&link->permanent_hw_addr));
2097
2098 return 0;
2099 }
2100
2101 static int link_update_hardware_address(Link *link, sd_netlink_message *message) {
2102 struct hw_addr_data addr;
2103 int r;
2104
2105 assert(link);
2106 assert(message);
2107
2108 r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr);
2109 if (r < 0 && r != -ENODATA)
2110 return log_link_debug_errno(link, r, "rtnl: failed to read broadcast address: %m");
2111
2112 r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &addr);
2113 if (r == -ENODATA)
2114 return 0;
2115 if (r < 0)
2116 return log_link_debug_errno(link, r, "rtnl: failed to read hardware address: %m");
2117
2118 if (hw_addr_equal(&link->hw_addr, &addr))
2119 return 0;
2120
2121 if (link->hw_addr.length == 0)
2122 log_link_debug(link, "Saved hardware address: %s", HW_ADDR_TO_STR(&addr));
2123 else {
2124 log_link_debug(link, "Hardware address is changed: %s %s %s",
2125 HW_ADDR_TO_STR(&link->hw_addr),
2126 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT),
2127 HW_ADDR_TO_STR(&addr));
2128
2129 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
2130 }
2131
2132 link->hw_addr = addr;
2133
2134 if (!hw_addr_is_null(&link->hw_addr)) {
2135 r = hashmap_ensure_put(&link->manager->links_by_hw_addr, &hw_addr_hash_ops, &link->hw_addr, link);
2136 if (r == -EEXIST && streq_ptr(link->kind, "bond"))
2137 /* bonding master and its slaves have the same hardware address. */
2138 r = hashmap_replace(link->manager->links_by_hw_addr, &link->hw_addr, link);
2139 if (r < 0)
2140 log_link_debug_errno(link, r, "Failed to manage link by its new hardware address, ignoring: %m");
2141 }
2142
2143 r = ipv4ll_update_mac(link);
2144 if (r < 0)
2145 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m");
2146
2147 r = ipv4ll_update_mac(link);
2148 if (r < 0)
2149 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
2150
2151 r = dhcp4_update_mac(link);
2152 if (r < 0)
2153 return log_link_debug_errno(link, r, "Could not update MAC address in DHCP client: %m");
2154
2155 r = dhcp6_update_mac(link);
2156 if (r < 0)
2157 return log_link_debug_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
2158
2159 r = radv_update_mac(link);
2160 if (r < 0)
2161 return log_link_debug_errno(link, r, "Could not update MAC address for Router Advertisement: %m");
2162
2163 if (link->ndisc && link->hw_addr.length == ETH_ALEN) {
2164 r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether);
2165 if (r < 0)
2166 return log_link_debug_errno(link, r, "Could not update MAC for NDisc: %m");
2167 }
2168
2169 if (link->lldp_rx) {
2170 r = sd_lldp_rx_set_filter_address(link->lldp_rx, &link->hw_addr.ether);
2171 if (r < 0)
2172 return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Rx: %m");
2173 }
2174
2175 if (link->lldp_tx) {
2176 r = sd_lldp_tx_set_hwaddr(link->lldp_tx, &link->hw_addr.ether);
2177 if (r < 0)
2178 return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Tx: %m");
2179 }
2180
2181 return 0;
2182 }
2183
2184 static int link_update_mtu(Link *link, sd_netlink_message *message) {
2185 uint32_t mtu, min_mtu = 0, max_mtu = UINT32_MAX;
2186 int r;
2187
2188 assert(link);
2189 assert(message);
2190
2191 r = sd_netlink_message_read_u32(message, IFLA_MTU, &mtu);
2192 if (r == -ENODATA)
2193 return 0;
2194 if (r < 0)
2195 return log_link_debug_errno(link, r, "rtnl: failed to read MTU in RTM_NEWLINK message: %m");
2196 if (mtu == 0)
2197 return 0;
2198
2199 r = sd_netlink_message_read_u32(message, IFLA_MIN_MTU, &min_mtu);
2200 if (r < 0 && r != -ENODATA)
2201 return log_link_debug_errno(link, r, "rtnl: failed to read minimum MTU in RTM_NEWLINK message: %m");
2202
2203 r = sd_netlink_message_read_u32(message, IFLA_MAX_MTU, &max_mtu);
2204 if (r < 0 && r != -ENODATA)
2205 return log_link_debug_errno(link, r, "rtnl: failed to read maximum MTU in RTM_NEWLINK message: %m");
2206
2207 if (max_mtu == 0)
2208 max_mtu = UINT32_MAX;
2209
2210 link->min_mtu = min_mtu;
2211 link->max_mtu = max_mtu;
2212
2213 if (link->original_mtu == 0) {
2214 link->original_mtu = mtu;
2215 log_link_debug(link, "Saved original MTU %" PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2216 link->original_mtu, link->min_mtu, link->max_mtu);
2217 }
2218
2219 if (link->mtu == mtu)
2220 return 0;
2221
2222 if (link->mtu != 0)
2223 log_link_debug(link, "MTU is changed: %"PRIu32" %s %"PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2224 link->mtu, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), mtu,
2225 link->min_mtu, link->max_mtu);
2226
2227 link->mtu = mtu;
2228
2229 if (link->dhcp_client) {
2230 r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
2231 if (r < 0)
2232 return log_link_debug_errno(link, r, "Could not update MTU in DHCP client: %m");
2233 }
2234
2235 if (link->radv) {
2236 r = sd_radv_set_mtu(link->radv, link->mtu);
2237 if (r < 0)
2238 return log_link_debug_errno(link, r, "Could not set MTU for Router Advertisement: %m");
2239 }
2240
2241 return 0;
2242 }
2243
2244 static int link_update_alternative_names(Link *link, sd_netlink_message *message) {
2245 _cleanup_strv_free_ char **altnames = NULL;
2246 int r;
2247
2248 assert(link);
2249 assert(message);
2250
2251 r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &altnames);
2252 if (r == -ENODATA)
2253 /* The message does not have IFLA_PROP_LIST container attribute. It does not means the
2254 * interface has no alternative name. */
2255 return 0;
2256 if (r < 0)
2257 return log_link_debug_errno(link, r, "rtnl: failed to read alternative names: %m");
2258
2259 if (strv_equal(altnames, link->alternative_names))
2260 return 0;
2261
2262 STRV_FOREACH(n, link->alternative_names)
2263 hashmap_remove(link->manager->links_by_name, *n);
2264
2265 strv_free_and_replace(link->alternative_names, altnames);
2266
2267 STRV_FOREACH(n, link->alternative_names) {
2268 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, *n, link);
2269 if (r < 0)
2270 return log_link_debug_errno(link, r, "Failed to manage link by its new alternative names: %m");
2271 }
2272
2273 return 0;
2274 }
2275
2276 static int link_update_name(Link *link, sd_netlink_message *message) {
2277 char ifname_from_index[IF_NAMESIZE];
2278 const char *ifname;
2279 int r;
2280
2281 assert(link);
2282 assert(message);
2283
2284 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
2285 if (r == -ENODATA)
2286 /* Hmm?? But ok. */
2287 return 0;
2288 if (r < 0)
2289 return log_link_debug_errno(link, r, "Failed to read interface name in RTM_NEWLINK message: %m");
2290
2291 if (streq(ifname, link->ifname))
2292 return 0;
2293
2294 r = format_ifname(link->ifindex, ifname_from_index);
2295 if (r < 0)
2296 return log_link_debug_errno(link, r, "Could not get interface name for index %i.", link->ifindex);
2297
2298 if (!streq(ifname, ifname_from_index)) {
2299 log_link_debug(link, "New interface name '%s' received from the kernel does not correspond "
2300 "with the name currently configured on the actual interface '%s'. Ignoring.",
2301 ifname, ifname_from_index);
2302 return 0;
2303 }
2304
2305 log_link_info(link, "Interface name change detected, renamed to %s.", ifname);
2306
2307 hashmap_remove(link->manager->links_by_name, link->ifname);
2308
2309 r = free_and_strdup(&link->ifname, ifname);
2310 if (r < 0)
2311 return log_oom_debug();
2312
2313 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, link->ifname, link);
2314 if (r < 0)
2315 return log_link_debug_errno(link, r, "Failed to manage link by its new name: %m");
2316
2317 if (link->dhcp_client) {
2318 r = sd_dhcp_client_set_ifname(link->dhcp_client, link->ifname);
2319 if (r < 0)
2320 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP client: %m");
2321 }
2322
2323 if (link->dhcp6_client) {
2324 r = sd_dhcp6_client_set_ifname(link->dhcp6_client, link->ifname);
2325 if (r < 0)
2326 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP6 client: %m");
2327 }
2328
2329 if (link->ndisc) {
2330 r = sd_ndisc_set_ifname(link->ndisc, link->ifname);
2331 if (r < 0)
2332 return log_link_debug_errno(link, r, "Failed to update interface name in NDisc: %m");
2333 }
2334
2335 if (link->dhcp_server) {
2336 r = sd_dhcp_server_set_ifname(link->dhcp_server, link->ifname);
2337 if (r < 0)
2338 return log_link_debug_errno(link, r, "Failed to update interface name in DHCP server: %m");
2339 }
2340
2341 if (link->radv) {
2342 r = sd_radv_set_ifname(link->radv, link->ifname);
2343 if (r < 0)
2344 return log_link_debug_errno(link, r, "Failed to update interface name in Router Advertisement: %m");
2345 }
2346
2347 if (link->lldp_rx) {
2348 r = sd_lldp_rx_set_ifname(link->lldp_rx, link->ifname);
2349 if (r < 0)
2350 return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Rx: %m");
2351 }
2352
2353 if (link->lldp_tx) {
2354 r = sd_lldp_tx_set_ifname(link->lldp_tx, link->ifname);
2355 if (r < 0)
2356 return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Tx: %m");
2357 }
2358
2359 if (link->ipv4ll) {
2360 r = sd_ipv4ll_set_ifname(link->ipv4ll, link->ifname);
2361 if (r < 0)
2362 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4LL client: %m");
2363 }
2364
2365 r = ipv4acd_set_ifname(link);
2366 if (r < 0)
2367 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4ACD client: %m");
2368
2369 return 0;
2370 }
2371
2372 static int link_update(Link *link, sd_netlink_message *message) {
2373 int r;
2374
2375 assert(link);
2376 assert(message);
2377
2378 r = link_update_name(link, message);
2379 if (r < 0)
2380 return r;
2381
2382 r = link_update_alternative_names(link, message);
2383 if (r < 0)
2384 return r;
2385
2386 r = link_update_mtu(link, message);
2387 if (r < 0)
2388 return r;
2389
2390 r = link_update_driver(link, message);
2391 if (r < 0)
2392 return r;
2393
2394 r = link_update_permanent_hardware_address(link, message);
2395 if (r < 0)
2396 return r;
2397
2398 r = link_update_hardware_address(link, message);
2399 if (r < 0)
2400 return r;
2401
2402 r = link_update_master(link, message);
2403 if (r < 0)
2404 return r;
2405
2406 r = link_update_ipv6ll_addrgen_mode(link, message);
2407 if (r < 0)
2408 return r;
2409
2410 return link_update_flags(link, message);
2411 }
2412
2413 static Link *link_drop_or_unref(Link *link) {
2414 if (!link)
2415 return NULL;
2416 if (!link->manager)
2417 return link_unref(link);
2418 return link_drop(link);
2419 }
2420
2421 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_drop_or_unref);
2422
2423 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
2424 _cleanup_free_ char *ifname = NULL, *kind = NULL, *state_file = NULL, *lease_file = NULL, *lldp_file = NULL;
2425 _cleanup_(link_drop_or_unrefp) Link *link = NULL;
2426 unsigned short iftype;
2427 int r, ifindex;
2428
2429 assert(manager);
2430 assert(message);
2431 assert(ret);
2432
2433 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2434 if (r < 0)
2435 return log_debug_errno(r, "rtnl: failed to read ifindex from link message: %m");
2436 else if (ifindex <= 0)
2437 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "rtnl: received link message without valid ifindex.");
2438
2439 r = sd_rtnl_message_link_get_type(message, &iftype);
2440 if (r < 0)
2441 return log_debug_errno(r, "rtnl: failed to read interface type from link message: %m");
2442
2443 r = sd_netlink_message_read_string_strdup(message, IFLA_IFNAME, &ifname);
2444 if (r < 0)
2445 return log_debug_errno(r, "rtnl: failed to read interface name from link message: %m");
2446
2447 /* check for link kind */
2448 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
2449 if (r >= 0) {
2450 r = sd_netlink_message_read_string_strdup(message, IFLA_INFO_KIND, &kind);
2451 if (r < 0 && r != -ENODATA)
2452 return log_debug_errno(r, "rtnl: failed to read interface kind from link message: %m");
2453 r = sd_netlink_message_exit_container(message);
2454 if (r < 0)
2455 return log_debug_errno(r, "rtnl: failed to exit IFLA_LINKINFO container: %m");
2456 }
2457
2458 if (!manager->test_mode) {
2459 /* Do not update state files when running in test mode. */
2460 if (asprintf(&state_file, "/run/systemd/netif/links/%d", ifindex) < 0)
2461 return log_oom_debug();
2462
2463 if (asprintf(&lease_file, "/run/systemd/netif/leases/%d", ifindex) < 0)
2464 return log_oom_debug();
2465
2466 if (asprintf(&lldp_file, "/run/systemd/netif/lldp/%d", ifindex) < 0)
2467 return log_oom_debug();
2468 }
2469
2470 link = new(Link, 1);
2471 if (!link)
2472 return -ENOMEM;
2473
2474 *link = (Link) {
2475 .n_ref = 1,
2476 .state = LINK_STATE_PENDING,
2477 .online_state = _LINK_ONLINE_STATE_INVALID,
2478 .ifindex = ifindex,
2479 .iftype = iftype,
2480 .ifname = TAKE_PTR(ifname),
2481 .kind = TAKE_PTR(kind),
2482
2483 .ipv6ll_address_gen_mode = _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_INVALID,
2484
2485 .state_file = TAKE_PTR(state_file),
2486 .lease_file = TAKE_PTR(lease_file),
2487 .lldp_file = TAKE_PTR(lldp_file),
2488
2489 .n_dns = UINT_MAX,
2490 .dns_default_route = -1,
2491 .llmnr = _RESOLVE_SUPPORT_INVALID,
2492 .mdns = _RESOLVE_SUPPORT_INVALID,
2493 .dnssec_mode = _DNSSEC_MODE_INVALID,
2494 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
2495 };
2496
2497 r = hashmap_ensure_put(&manager->links_by_index, NULL, INT_TO_PTR(link->ifindex), link);
2498 if (r < 0)
2499 return log_link_debug_errno(link, r, "Failed to store link into manager: %m");
2500
2501 link->manager = manager;
2502
2503 r = hashmap_ensure_put(&manager->links_by_name, &string_hash_ops, link->ifname, link);
2504 if (r < 0)
2505 return log_link_debug_errno(link, r, "Failed to manage link by its interface name: %m");
2506
2507 log_link_debug(link, "Saved new link: ifindex=%i, iftype=%s(%u), kind=%s",
2508 link->ifindex, strna(arphrd_to_name(link->iftype)), link->iftype, strna(link->kind));
2509
2510 *ret = TAKE_PTR(link);
2511 return 0;
2512 }
2513
2514 int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, Manager *manager) {
2515 Link *link = NULL;
2516 NetDev *netdev = NULL;
2517 uint16_t type;
2518 const char *name;
2519 int r, ifindex;
2520
2521 assert(rtnl);
2522 assert(message);
2523 assert(manager);
2524
2525 if (sd_netlink_message_is_error(message)) {
2526 r = sd_netlink_message_get_errno(message);
2527 if (r < 0)
2528 log_message_warning_errno(message, r, "rtnl: Could not receive link message, ignoring");
2529
2530 return 0;
2531 }
2532
2533 r = sd_netlink_message_get_type(message, &type);
2534 if (r < 0) {
2535 log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
2536 return 0;
2537 } else if (!IN_SET(type, RTM_NEWLINK, RTM_DELLINK)) {
2538 log_warning("rtnl: Received unexpected message type %u when processing link, ignoring.", type);
2539 return 0;
2540 }
2541
2542 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2543 if (r < 0) {
2544 log_warning_errno(r, "rtnl: Could not get ifindex from link message, ignoring: %m");
2545 return 0;
2546 } else if (ifindex <= 0) {
2547 log_warning("rtnl: received link message with invalid ifindex %d, ignoring.", ifindex);
2548 return 0;
2549 }
2550
2551 r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
2552 if (r < 0) {
2553 log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
2554 return 0;
2555 }
2556
2557 (void) link_get_by_index(manager, ifindex, &link);
2558 (void) netdev_get(manager, name, &netdev);
2559
2560 switch (type) {
2561 case RTM_NEWLINK:
2562 if (netdev) {
2563 /* netdev exists, so make sure the ifindex matches */
2564 r = netdev_set_ifindex(netdev, message);
2565 if (r < 0) {
2566 log_netdev_warning_errno(netdev, r, "Could not process new link message for netdev, ignoring: %m");
2567 return 0;
2568 }
2569 }
2570
2571 if (!link) {
2572 /* link is new, so add it */
2573 r = link_new(manager, message, &link);
2574 if (r < 0) {
2575 log_warning_errno(r, "Could not process new link message: %m");
2576 return 0;
2577 }
2578
2579 r = link_update(link, message);
2580 if (r < 0) {
2581 log_link_warning_errno(link, r, "Could not process link message: %m");
2582 link_enter_failed(link);
2583 return 0;
2584 }
2585
2586 r = link_check_initialized(link);
2587 if (r < 0) {
2588 log_link_warning_errno(link, r, "Failed to check link is initialized: %m");
2589 link_enter_failed(link);
2590 return 0;
2591 }
2592 } else {
2593 r = link_update(link, message);
2594 if (r < 0) {
2595 log_link_warning_errno(link, r, "Could not process link message: %m");
2596 link_enter_failed(link);
2597 return 0;
2598 }
2599 }
2600 break;
2601
2602 case RTM_DELLINK:
2603 link_drop(link);
2604 netdev_drop(netdev);
2605 break;
2606
2607 default:
2608 assert_not_reached();
2609 }
2610
2611 return 1;
2612 }
2613
2614 int link_getlink_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, const char *error_msg) {
2615 uint16_t message_type;
2616 int r;
2617
2618 assert(m);
2619 assert(link);
2620 assert(error_msg);
2621
2622 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2623 return 0;
2624
2625 r = sd_netlink_message_get_errno(m);
2626 if (r < 0) {
2627 log_link_message_warning_errno(link, m, r, error_msg);
2628 link_enter_failed(link);
2629 return 0;
2630 }
2631
2632 r = sd_netlink_message_get_type(m, &message_type);
2633 if (r < 0) {
2634 log_link_debug_errno(link, r, "rtnl: failed to read link message type, ignoring: %m");
2635 return 0;
2636 }
2637 if (message_type != RTM_NEWLINK) {
2638 log_link_debug(link, "rtnl: received invalid link message type, ignoring.");
2639 return 0;
2640 }
2641
2642 r = link_update(link, m);
2643 if (r < 0) {
2644 link_enter_failed(link);
2645 return 0;
2646 }
2647
2648 return 1;
2649 }
2650
2651 int link_call_getlink(Link *link, link_netlink_message_handler_t callback) {
2652 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2653 int r;
2654
2655 assert(link);
2656 assert(link->manager);
2657 assert(link->manager->rtnl);
2658 assert(callback);
2659
2660 r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
2661 if (r < 0)
2662 return r;
2663
2664 r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
2665 link_netlink_destroy_callback, link);
2666 if (r < 0)
2667 return r;
2668
2669 link_ref(link);
2670 return 0;
2671 }
2672
2673 static const char* const link_state_table[_LINK_STATE_MAX] = {
2674 [LINK_STATE_PENDING] = "pending",
2675 [LINK_STATE_INITIALIZED] = "initialized",
2676 [LINK_STATE_CONFIGURING] = "configuring",
2677 [LINK_STATE_CONFIGURED] = "configured",
2678 [LINK_STATE_UNMANAGED] = "unmanaged",
2679 [LINK_STATE_FAILED] = "failed",
2680 [LINK_STATE_LINGER] = "linger",
2681 };
2682
2683 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
2684
2685 int link_flags_to_string_alloc(uint32_t flags, char **ret) {
2686 _cleanup_free_ char *str = NULL;
2687 static const char* map[] = {
2688 [LOG2U(IFF_UP)] = "up", /* interface is up. */
2689 [LOG2U(IFF_BROADCAST)] = "broadcast", /* broadcast address valid.*/
2690 [LOG2U(IFF_DEBUG)] = "debug", /* turn on debugging. */
2691 [LOG2U(IFF_LOOPBACK)] = "loopback", /* interface is a loopback net. */
2692 [LOG2U(IFF_POINTOPOINT)] = "point-to-point", /* interface has p-p link. */
2693 [LOG2U(IFF_NOTRAILERS)] = "no-trailers", /* avoid use of trailers. */
2694 [LOG2U(IFF_RUNNING)] = "running", /* interface RFC2863 OPER_UP. */
2695 [LOG2U(IFF_NOARP)] = "no-arp", /* no ARP protocol. */
2696 [LOG2U(IFF_PROMISC)] = "promiscuous", /* receive all packets. */
2697 [LOG2U(IFF_ALLMULTI)] = "all-multicast", /* receive all multicast packets. */
2698 [LOG2U(IFF_MASTER)] = "master", /* master of a load balancer. */
2699 [LOG2U(IFF_SLAVE)] = "slave", /* slave of a load balancer. */
2700 [LOG2U(IFF_MULTICAST)] = "multicast", /* supports multicast.*/
2701 [LOG2U(IFF_PORTSEL)] = "portsel", /* can set media type. */
2702 [LOG2U(IFF_AUTOMEDIA)] = "auto-media", /* auto media select active. */
2703 [LOG2U(IFF_DYNAMIC)] = "dynamic", /* dialup device with changing addresses. */
2704 [LOG2U(IFF_LOWER_UP)] = "lower-up", /* driver signals L1 up. */
2705 [LOG2U(IFF_DORMANT)] = "dormant", /* driver signals dormant. */
2706 [LOG2U(IFF_ECHO)] = "echo", /* echo sent packets. */
2707 };
2708
2709 assert(ret);
2710
2711 for (size_t i = 0; i < ELEMENTSOF(map); i++)
2712 if (FLAGS_SET(flags, 1 << i) && map[i])
2713 if (!strextend_with_separator(&str, ",", map[i]))
2714 return -ENOMEM;
2715
2716 *ret = TAKE_PTR(str);
2717 return 0;
2718 }
2719
2720 static const char * const kernel_operstate_table[] = {
2721 [IF_OPER_UNKNOWN] = "unknown",
2722 [IF_OPER_NOTPRESENT] = "not-present",
2723 [IF_OPER_DOWN] = "down",
2724 [IF_OPER_LOWERLAYERDOWN] = "lower-layer-down",
2725 [IF_OPER_TESTING] = "testing",
2726 [IF_OPER_DORMANT] = "dormant",
2727 [IF_OPER_UP] = "up",
2728 };
2729
2730 DEFINE_STRING_TABLE_LOOKUP_TO_STRING(kernel_operstate, int);
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