1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
4 #include <netinet/in.h>
6 #include <linux/if_arp.h>
7 #include <linux/if_link.h>
8 #include <linux/netdevice.h>
9 #include <sys/socket.h>
12 #include "alloc-util.h"
13 #include "arphrd-util.h"
18 #include "device-private.h"
19 #include "device-util.h"
20 #include "dhcp-lease-internal.h"
22 #include "ethtool-util.h"
23 #include "event-util.h"
26 #include "format-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"
64 #include "socket-util.h"
65 #include "stdio-util.h"
66 #include "string-table.h"
69 #include "tmpfile-util.h"
71 #include "udev-util.h"
74 void link_required_operstate_for_online(Link
*link
, LinkOperationalStateRange
*ret
) {
78 if (link
->network
&& operational_state_range_is_valid(&link
->network
->required_operstate_for_online
))
79 /* If explicitly specified, use it as is. */
80 *ret
= link
->network
->required_operstate_for_online
;
81 else if (link
->iftype
== ARPHRD_CAN
)
82 /* CAN devices do not support addressing, hence defaults to 'carrier'. */
83 *ret
= (const LinkOperationalStateRange
) {
84 .min
= LINK_OPERSTATE_CARRIER
,
85 .max
= LINK_OPERSTATE_CARRIER
,
87 else if (link
->network
&& link
->network
->bond
)
88 /* Bonding slaves do not support addressing. */
89 *ret
= (const LinkOperationalStateRange
) {
90 .min
= LINK_OPERSTATE_ENSLAVED
,
91 .max
= LINK_OPERSTATE_ENSLAVED
,
93 else if (STRPTR_IN_SET(link
->kind
, "batadv", "bond", "bridge", "vrf"))
94 /* Some of slave interfaces may be offline. */
95 *ret
= (const LinkOperationalStateRange
) {
96 .min
= LINK_OPERSTATE_DEGRADED_CARRIER
,
97 .max
= LINK_OPERSTATE_ROUTABLE
,
100 *ret
= LINK_OPERSTATE_RANGE_DEFAULT
;
103 AddressFamily
link_required_family_for_online(Link
*link
) {
106 if (link
->network
&& link
->network
->required_family_for_online
>= 0)
107 return link
->network
->required_family_for_online
;
109 if (link
->network
&& operational_state_range_is_valid(&link
->network
->required_operstate_for_online
))
110 /* If RequiredForOnline= is explicitly specified, defaults to no. */
111 return ADDRESS_FAMILY_NO
;
113 if (STRPTR_IN_SET(link
->kind
, "batadv", "bond", "bridge", "vrf"))
114 /* As the minimum required operstate for master interfaces is 'degraded-carrier',
115 * we should request an address assigned to the link for backward compatibility. */
116 return ADDRESS_FAMILY_YES
;
118 return ADDRESS_FAMILY_NO
;
121 bool link_ipv6_enabled(Link
*link
) {
124 if (!socket_ipv6_is_supported())
127 if (link
->iftype
== ARPHRD_CAN
)
133 if (link
->network
->bond
)
136 if (link_may_have_ipv6ll(link
, /* check_multicast = */ false))
139 if (network_has_static_ipv6_configurations(link
->network
))
145 bool link_has_ipv6_connectivity(Link
*link
) {
146 LinkAddressState ipv6_address_state
;
150 link_get_address_states(link
, NULL
, &ipv6_address_state
, NULL
);
152 switch (ipv6_address_state
) {
153 case LINK_ADDRESS_STATE_ROUTABLE
:
154 /* If the interface has a routable IPv6 address, then we assume yes. */
157 case LINK_ADDRESS_STATE_DEGRADED
:
158 /* If the interface has only degraded IPv6 address (mostly, link-local address), then let's check
159 * there is an IPv6 default gateway. */
160 return link_has_default_gateway(link
, AF_INET6
);
162 case LINK_ADDRESS_STATE_OFF
:
163 /* No IPv6 address. */
167 assert_not_reached();
171 static bool link_is_ready_to_configure_one(Link
*link
, bool allow_unmanaged
) {
174 if (!IN_SET(link
->state
, LINK_STATE_CONFIGURING
, LINK_STATE_CONFIGURED
, LINK_STATE_UNMANAGED
))
178 return allow_unmanaged
;
180 if (!link
->network
->configure_without_carrier
) {
181 if (link
->set_flags_messages
> 0)
184 if (!link_has_carrier(link
))
188 if (link
->set_link_messages
> 0)
191 if (!link
->activated
)
197 bool link_is_ready_to_configure(Link
*link
, bool allow_unmanaged
) {
198 return check_ready_for_all_sr_iov_ports(link
, allow_unmanaged
, link_is_ready_to_configure_one
);
201 void link_ntp_settings_clear(Link
*link
) {
202 link
->ntp
= strv_free(link
->ntp
);
205 void link_dns_settings_clear(Link
*link
) {
206 if (link
->n_dns
!= UINT_MAX
)
207 for (unsigned i
= 0; i
< link
->n_dns
; i
++)
208 in_addr_full_free(link
->dns
[i
]);
209 link
->dns
= mfree(link
->dns
);
210 link
->n_dns
= UINT_MAX
;
212 link
->search_domains
= ordered_set_free(link
->search_domains
);
213 link
->route_domains
= ordered_set_free(link
->route_domains
);
215 link
->dns_default_route
= -1;
216 link
->llmnr
= _RESOLVE_SUPPORT_INVALID
;
217 link
->mdns
= _RESOLVE_SUPPORT_INVALID
;
218 link
->dnssec_mode
= _DNSSEC_MODE_INVALID
;
219 link
->dns_over_tls_mode
= _DNS_OVER_TLS_MODE_INVALID
;
221 link
->dnssec_negative_trust_anchors
= set_free_free(link
->dnssec_negative_trust_anchors
);
224 static void link_free_engines(Link
*link
) {
228 link
->dhcp_server
= sd_dhcp_server_unref(link
->dhcp_server
);
230 link
->dhcp_client
= sd_dhcp_client_unref(link
->dhcp_client
);
231 link
->dhcp_lease
= sd_dhcp_lease_unref(link
->dhcp_lease
);
232 link
->dhcp4_6rd_tunnel_name
= mfree(link
->dhcp4_6rd_tunnel_name
);
234 link
->lldp_rx
= sd_lldp_rx_unref(link
->lldp_rx
);
235 link
->lldp_tx
= sd_lldp_tx_unref(link
->lldp_tx
);
237 link
->ipv4acd_by_address
= hashmap_free(link
->ipv4acd_by_address
);
239 link
->ipv4ll
= sd_ipv4ll_unref(link
->ipv4ll
);
241 link
->dhcp6_client
= sd_dhcp6_client_unref(link
->dhcp6_client
);
242 link
->dhcp6_lease
= sd_dhcp6_lease_unref(link
->dhcp6_lease
);
244 link
->ndisc
= sd_ndisc_unref(link
->ndisc
);
245 link
->ndisc_expire
= sd_event_source_disable_unref(link
->ndisc_expire
);
248 link
->radv
= sd_radv_unref(link
->radv
);
251 static Link
*link_free(Link
*link
) {
254 link_ntp_settings_clear(link
);
255 link_dns_settings_clear(link
);
257 link
->neighbors
= set_free(link
->neighbors
);
258 link
->addresses
= set_free(link
->addresses
);
259 link
->qdiscs
= set_free(link
->qdiscs
);
260 link
->tclasses
= set_free(link
->tclasses
);
262 link
->dhcp_pd_prefixes
= set_free(link
->dhcp_pd_prefixes
);
264 link_free_engines(link
);
266 set_free(link
->sr_iov_virt_port_ifindices
);
268 strv_free(link
->alternative_names
);
271 free(link
->previous_ssid
);
274 unlink_and_free(link
->lease_file
);
275 unlink_and_free(link
->lldp_file
);
276 unlink_and_free(link
->state_file
);
278 sd_device_unref(link
->dev
);
279 netdev_unref(link
->netdev
);
281 hashmap_free(link
->bound_to_links
);
282 hashmap_free(link
->bound_by_links
);
284 set_free_with_destructor(link
->slaves
, link_unref
);
286 network_unref(link
->network
);
288 sd_event_source_disable_unref(link
->carrier_lost_timer
);
293 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link
, link
, link_free
);
295 int link_get_by_index(Manager
*m
, int ifindex
, Link
**ret
) {
303 link
= hashmap_get(m
->links_by_index
, INT_TO_PTR(ifindex
));
312 int link_get_by_name(Manager
*m
, const char *ifname
, Link
**ret
) {
318 link
= hashmap_get(m
->links_by_name
, ifname
);
327 int link_get_by_hw_addr(Manager
*m
, const struct hw_addr_data
*hw_addr
, Link
**ret
) {
333 link
= hashmap_get(m
->links_by_hw_addr
, hw_addr
);
342 int link_get_master(Link
*link
, Link
**ret
) {
344 assert(link
->manager
);
347 if (link
->master_ifindex
<= 0 || link
->master_ifindex
== link
->ifindex
)
350 return link_get_by_index(link
->manager
, link
->master_ifindex
, ret
);
353 void link_set_state(Link
*link
, LinkState state
) {
356 if (link
->state
== state
)
359 log_link_debug(link
, "State changed: %s -> %s",
360 link_state_to_string(link
->state
),
361 link_state_to_string(state
));
365 link_send_changed(link
, "AdministrativeState", NULL
);
369 int link_stop_engines(Link
*link
, bool may_keep_dhcp
) {
373 assert(link
->manager
);
374 assert(link
->manager
->event
);
376 bool keep_dhcp
= may_keep_dhcp
&&
378 !link
->network
->dhcp_send_decline
&& /* IPv4 ACD for the DHCPv4 address is running. */
379 (link
->manager
->restarting
||
380 FLAGS_SET(link
->network
->keep_configuration
, KEEP_CONFIGURATION_DHCP_ON_STOP
));
383 r
= sd_dhcp_client_stop(link
->dhcp_client
);
385 RET_GATHER(ret
, log_link_warning_errno(link
, r
, "Could not stop DHCPv4 client: %m"));
388 r
= sd_dhcp_server_stop(link
->dhcp_server
);
390 RET_GATHER(ret
, log_link_warning_errno(link
, r
, "Could not stop DHCPv4 server: %m"));
392 r
= sd_lldp_rx_stop(link
->lldp_rx
);
394 RET_GATHER(ret
, log_link_warning_errno(link
, r
, "Could not stop LLDP Rx: %m"));
396 r
= sd_lldp_tx_stop(link
->lldp_tx
);
398 RET_GATHER(ret
, log_link_warning_errno(link
, r
, "Could not stop LLDP Tx: %m"));
400 r
= sd_ipv4ll_stop(link
->ipv4ll
);
402 RET_GATHER(ret
, log_link_warning_errno(link
, r
, "Could not stop IPv4 link-local: %m"));
404 r
= ipv4acd_stop(link
);
406 RET_GATHER(ret
, log_link_warning_errno(link
, r
, "Could not stop IPv4 ACD client: %m"));
408 r
= sd_dhcp6_client_stop(link
->dhcp6_client
);
410 RET_GATHER(ret
, log_link_warning_errno(link
, r
, "Could not stop DHCPv6 client: %m"));
412 r
= dhcp_pd_remove(link
, /* only_marked = */ false);
414 RET_GATHER(ret
, log_link_warning_errno(link
, r
, "Could not remove DHCPv6 PD addresses and routes: %m"));
416 r
= ndisc_stop(link
);
418 RET_GATHER(ret
, log_link_warning_errno(link
, r
, "Could not stop IPv6 Router Discovery: %m"));
422 r
= sd_radv_stop(link
->radv
);
424 RET_GATHER(ret
, log_link_warning_errno(link
, r
, "Could not stop IPv6 Router Advertisement: %m"));
429 void link_enter_failed(Link
*link
) {
434 if (IN_SET(link
->state
, LINK_STATE_FAILED
, LINK_STATE_LINGER
))
437 log_link_warning(link
, "Failed");
439 link_set_state(link
, LINK_STATE_FAILED
);
441 if (!ratelimit_below(&link
->automatic_reconfigure_ratelimit
)) {
442 log_link_warning(link
, "The interface entered the failed state frequently, refusing to reconfigure it automatically.");
446 log_link_info(link
, "Trying to reconfigure the interface.");
447 r
= link_reconfigure(link
, /* force = */ true);
449 log_link_warning_errno(link
, r
, "Failed to reconfigure interface: %m");
456 (void) link_stop_engines(link
, /* may_keep_dhcp = */ false);
459 void link_check_ready(Link
*link
) {
464 if (link
->state
== LINK_STATE_CONFIGURED
)
467 if (link
->state
!= LINK_STATE_CONFIGURING
)
468 return (void) log_link_debug(link
, "%s(): link is in %s state.", __func__
, link_state_to_string(link
->state
));
471 return (void) log_link_debug(link
, "%s(): link is unmanaged.", __func__
);
473 if (!link
->tc_configured
)
474 return (void) log_link_debug(link
, "%s(): traffic controls are not configured.", __func__
);
476 if (link
->set_link_messages
> 0)
477 return (void) log_link_debug(link
, "%s(): link layer is configuring.", __func__
);
479 if (!link
->activated
)
480 return (void) log_link_debug(link
, "%s(): link is not activated.", __func__
);
482 if (link
->iftype
== ARPHRD_CAN
)
483 /* let's shortcut things for CAN which doesn't need most of checks below. */
486 if (!link
->stacked_netdevs_created
)
487 return (void) log_link_debug(link
, "%s(): stacked netdevs are not created.", __func__
);
489 if (!link
->static_addresses_configured
)
490 return (void) log_link_debug(link
, "%s(): static addresses are not configured.", __func__
);
492 if (!link
->static_address_labels_configured
)
493 return (void) log_link_debug(link
, "%s(): static address labels are not configured.", __func__
);
495 if (!link
->static_bridge_fdb_configured
)
496 return (void) log_link_debug(link
, "%s(): static bridge MDB entries are not configured.", __func__
);
498 if (!link
->static_bridge_mdb_configured
)
499 return (void) log_link_debug(link
, "%s(): static bridge MDB entries are not configured.", __func__
);
501 if (!link
->static_ipv6_proxy_ndp_configured
)
502 return (void) log_link_debug(link
, "%s(): static IPv6 proxy NDP addresses are not configured.", __func__
);
504 if (!link
->static_neighbors_configured
)
505 return (void) log_link_debug(link
, "%s(): static neighbors are not configured.", __func__
);
507 if (!link
->static_nexthops_configured
)
508 return (void) log_link_debug(link
, "%s(): static nexthops are not configured.", __func__
);
510 if (!link
->static_routes_configured
)
511 return (void) log_link_debug(link
, "%s(): static routes are not configured.", __func__
);
513 if (!link
->static_routing_policy_rules_configured
)
514 return (void) log_link_debug(link
, "%s(): static routing policy rules are not configured.", __func__
);
516 if (!link
->sr_iov_configured
)
517 return (void) log_link_debug(link
, "%s(): SR-IOV is not configured.", __func__
);
519 /* IPv6LL is assigned after the link gains its carrier. */
520 if (!link
->network
->configure_without_carrier
&&
521 link_ipv6ll_enabled(link
) &&
522 !in6_addr_is_set(&link
->ipv6ll_address
))
523 return (void) log_link_debug(link
, "%s(): IPv6LL is not configured yet.", __func__
);
525 /* All static addresses must be ready. */
526 bool has_static_address
= false;
527 SET_FOREACH(a
, link
->addresses
) {
528 if (a
->source
!= NETWORK_CONFIG_SOURCE_STATIC
)
530 if (!address_is_ready(a
))
531 return (void) log_link_debug(link
, "%s(): static address %s is not ready.", __func__
,
532 IN_ADDR_PREFIX_TO_STRING(a
->family
, &a
->in_addr
, a
->prefixlen
));
533 has_static_address
= true;
536 /* If at least one static address is requested, do not request that dynamic addressing protocols are finished. */
537 if (has_static_address
)
540 /* If no dynamic addressing protocol enabled, assume the interface is ready.
541 * Note, ignore NDisc when ConfigureWithoutCarrier= is enabled, as IPv6AcceptRA= is enabled by default. */
542 if (!link_ipv4ll_enabled(link
) && !link_dhcp4_enabled(link
) &&
543 !link_dhcp6_enabled(link
) && !link_dhcp_pd_is_enabled(link
) &&
544 (link
->network
->configure_without_carrier
|| !link_ipv6_accept_ra_enabled(link
)))
548 link_ipv4ll_enabled(link
) && link
->ipv4ll_address_configured
&&
549 link_check_addresses_ready(link
, NETWORK_CONFIG_SOURCE_IPV4LL
);
551 link_dhcp4_enabled(link
) && link
->dhcp4_configured
&&
552 link_check_addresses_ready(link
, NETWORK_CONFIG_SOURCE_DHCP4
);
554 link_dhcp6_enabled(link
) && link
->dhcp6_configured
&&
555 (!link
->network
->dhcp6_use_address
||
556 link_check_addresses_ready(link
, NETWORK_CONFIG_SOURCE_DHCP6
));
558 link_dhcp_pd_is_enabled(link
) && link
->dhcp_pd_configured
&&
559 (!link
->network
->dhcp_pd_assign
||
560 link_check_addresses_ready(link
, NETWORK_CONFIG_SOURCE_DHCP_PD
));
562 link_ipv6_accept_ra_enabled(link
) && link
->ndisc_configured
&&
563 (!link
->network
->ipv6_accept_ra_use_autonomous_prefix
||
564 link_check_addresses_ready(link
, NETWORK_CONFIG_SOURCE_NDISC
));
566 /* If the uplink for PD is self, then request the corresponding DHCP protocol is also ready. */
567 if (dhcp_pd_is_uplink(link
, link
, /* accept_auto = */ false)) {
568 if (link_dhcp4_enabled(link
) && link
->network
->dhcp_use_6rd
&&
569 sd_dhcp_lease_has_6rd(link
->dhcp_lease
)) {
571 return (void) log_link_debug(link
, "%s(): DHCPv4 6rd prefix is assigned, but DHCPv4 protocol is not finished yet.", __func__
);
573 return (void) log_link_debug(link
, "%s(): DHCPv4 is finished, but prefix acquired by DHCPv4-6rd is not assigned yet.", __func__
);
576 if (link_dhcp6_enabled(link
) && link
->network
->dhcp6_use_pd_prefix
&&
577 sd_dhcp6_lease_has_pd_prefix(link
->dhcp6_lease
)) {
579 return (void) log_link_debug(link
, "%s(): DHCPv6 IA_PD prefix is assigned, but DHCPv6 protocol is not finished yet.", __func__
);
581 return (void) log_link_debug(link
, "%s(): DHCPv6 is finished, but prefix acquired by DHCPv6 IA_PD is not assigned yet.", __func__
);
585 /* At least one dynamic addressing protocol is finished. */
586 if (!ipv4ll_ready
&& !dhcp4_ready
&& !dhcp6_ready
&& !dhcp_pd_ready
&& !ndisc_ready
)
587 return (void) log_link_debug(link
, "%s(): dynamic addressing protocols are enabled but none of them finished yet.", __func__
);
589 log_link_debug(link
, "%s(): IPv4LL:%s DHCPv4:%s DHCPv6:%s DHCP-PD:%s NDisc:%s",
591 yes_no(ipv4ll_ready
),
594 yes_no(dhcp_pd_ready
),
595 yes_no(ndisc_ready
));
598 link_set_state(link
, LINK_STATE_CONFIGURED
);
601 static int link_request_static_configs(Link
*link
) {
605 assert(link
->network
);
606 assert(link
->state
!= _LINK_STATE_INVALID
);
608 r
= link_request_static_addresses(link
);
612 r
= link_request_static_address_labels(link
);
616 r
= link_request_static_bridge_fdb(link
);
620 r
= link_request_static_bridge_mdb(link
);
624 r
= link_request_static_ipv6_proxy_ndp_addresses(link
);
628 r
= link_request_static_neighbors(link
);
632 r
= link_request_static_nexthops(link
, false);
636 r
= link_request_static_routes(link
, false);
640 r
= link_request_static_routing_policy_rules(link
);
647 static int link_request_stacked_netdevs(Link
*link
) {
653 link
->stacked_netdevs_created
= false;
655 HASHMAP_FOREACH(netdev
, link
->network
->stacked_netdevs
) {
656 r
= link_request_stacked_netdev(link
, netdev
);
661 if (link
->create_stacked_netdev_messages
== 0) {
662 link
->stacked_netdevs_created
= true;
663 link_check_ready(link
);
669 static int link_acquire_dynamic_ipv6_conf(Link
*link
) {
674 r
= radv_start(link
);
676 return log_link_warning_errno(link
, r
, "Failed to start IPv6 Router Advertisement engine: %m");
678 r
= ndisc_start(link
);
680 return log_link_warning_errno(link
, r
, "Failed to start IPv6 Router Discovery: %m");
682 r
= dhcp6_start(link
);
684 return log_link_warning_errno(link
, r
, "Failed to start DHCPv6 client: %m");
689 static int link_acquire_dynamic_ipv4_conf(Link
*link
) {
693 assert(link
->manager
);
694 assert(link
->manager
->event
);
696 if (link
->dhcp_client
) {
697 r
= dhcp4_start(link
);
699 return log_link_warning_errno(link
, r
, "Failed to start DHCPv4 client: %m");
701 log_link_debug(link
, "Acquiring DHCPv4 lease.");
703 } else if (link
->ipv4ll
) {
704 if (in4_addr_is_set(&link
->network
->ipv4ll_start_address
)) {
705 r
= sd_ipv4ll_set_address(link
->ipv4ll
, &link
->network
->ipv4ll_start_address
);
707 return log_link_warning_errno(link
, r
, "Could not set IPv4 link-local start address: %m");
710 r
= sd_ipv4ll_start(link
->ipv4ll
);
712 return log_link_warning_errno(link
, r
, "Could not acquire IPv4 link-local address: %m");
714 log_link_debug(link
, "Acquiring IPv4 link-local address.");
717 if (link
->dhcp_server
) {
718 r
= sd_dhcp_server_start(link
->dhcp_server
);
720 return log_link_warning_errno(link
, r
, "Could not start DHCP server: %m");
723 r
= ipv4acd_start(link
);
725 return log_link_warning_errno(link
, r
, "Could not start IPv4 ACD client: %m");
730 static int link_acquire_dynamic_conf(Link
*link
) {
734 assert(link
->network
);
736 r
= link_acquire_dynamic_ipv4_conf(link
);
740 if (in6_addr_is_set(&link
->ipv6ll_address
)) {
741 r
= link_acquire_dynamic_ipv6_conf(link
);
746 if (!link_radv_enabled(link
) || !link
->network
->dhcp_pd_announce
) {
747 /* DHCPv6PD downstream does not require IPv6LL address. But may require RADV to be
748 * configured, and RADV may not be configured yet here. Only acquire subnet prefix when
749 * RADV is disabled, or the announcement of the prefix is disabled. Otherwise, the
750 * below will be called in radv_start(). */
751 r
= dhcp_request_prefix_delegation(link
);
753 return log_link_warning_errno(link
, r
, "Failed to request DHCP delegated subnet prefix: %m");
757 r
= sd_lldp_tx_start(link
->lldp_tx
);
759 return log_link_warning_errno(link
, r
, "Failed to start LLDP transmission: %m");
763 r
= sd_lldp_rx_start(link
->lldp_rx
);
765 return log_link_warning_errno(link
, r
, "Failed to start LLDP client: %m");
771 int link_ipv6ll_gained(Link
*link
) {
776 log_link_info(link
, "Gained IPv6LL");
778 if (!IN_SET(link
->state
, LINK_STATE_CONFIGURING
, LINK_STATE_CONFIGURED
))
781 r
= link_acquire_dynamic_ipv6_conf(link
);
785 link_check_ready(link
);
789 int link_handle_bound_to_list(Link
*link
) {
790 bool required_up
= false;
791 bool link_is_up
= false;
796 /* If at least one interface in bound_to_links has carrier, then make this interface up.
797 * If all interfaces in bound_to_links do not, then make this interface down. */
799 if (hashmap_isempty(link
->bound_to_links
))
802 if (link
->flags
& IFF_UP
)
805 HASHMAP_FOREACH(l
, link
->bound_to_links
)
806 if (link_has_carrier(l
)) {
811 if (!required_up
&& link_is_up
)
812 return link_request_to_bring_up_or_down(link
, /* up = */ false);
813 if (required_up
&& !link_is_up
)
814 return link_request_to_bring_up_or_down(link
, /* up = */ true);
819 static int link_handle_bound_by_list(Link
*link
) {
825 /* Update up or down state of interfaces which depend on this interface's carrier state. */
827 if (hashmap_isempty(link
->bound_by_links
))
830 HASHMAP_FOREACH(l
, link
->bound_by_links
) {
831 r
= link_handle_bound_to_list(l
);
839 static int link_put_carrier(Link
*link
, Link
*carrier
, Hashmap
**h
) {
848 if (hashmap_get(*h
, INT_TO_PTR(carrier
->ifindex
)))
851 r
= hashmap_ensure_put(h
, NULL
, INT_TO_PTR(carrier
->ifindex
), carrier
);
860 static int link_new_bound_by_list(Link
*link
) {
866 assert(link
->manager
);
870 HASHMAP_FOREACH(carrier
, m
->links_by_index
) {
871 if (!carrier
->network
)
874 if (strv_isempty(carrier
->network
->bind_carrier
))
877 if (strv_fnmatch(carrier
->network
->bind_carrier
, link
->ifname
)) {
878 r
= link_put_carrier(link
, carrier
, &link
->bound_by_links
);
884 HASHMAP_FOREACH(carrier
, link
->bound_by_links
) {
885 r
= link_put_carrier(carrier
, link
, &carrier
->bound_to_links
);
893 static int link_new_bound_to_list(Link
*link
) {
899 assert(link
->manager
);
904 if (strv_isempty(link
->network
->bind_carrier
))
909 HASHMAP_FOREACH(carrier
, m
->links_by_index
) {
910 if (strv_fnmatch(link
->network
->bind_carrier
, carrier
->ifname
)) {
911 r
= link_put_carrier(link
, carrier
, &link
->bound_to_links
);
917 HASHMAP_FOREACH(carrier
, link
->bound_to_links
) {
918 r
= link_put_carrier(carrier
, link
, &carrier
->bound_by_links
);
926 static void link_free_bound_to_list(Link
*link
) {
927 bool updated
= false;
932 while ((bound_to
= hashmap_steal_first(link
->bound_to_links
))) {
935 if (hashmap_remove(bound_to
->bound_by_links
, INT_TO_PTR(link
->ifindex
)))
936 link_dirty(bound_to
);
943 static void link_free_bound_by_list(Link
*link
) {
944 bool updated
= false;
949 while ((bound_by
= hashmap_steal_first(link
->bound_by_links
))) {
952 if (hashmap_remove(bound_by
->bound_to_links
, INT_TO_PTR(link
->ifindex
))) {
953 link_dirty(bound_by
);
954 link_handle_bound_to_list(bound_by
);
962 static int link_append_to_master(Link
*link
) {
968 /* - The link may have no master.
969 * - RTM_NEWLINK message about master interface may not be received yet. */
970 if (link_get_master(link
, &master
) < 0)
973 r
= set_ensure_put(&master
->slaves
, NULL
, link
);
981 static void link_drop_from_master(Link
*link
) {
989 if (link_get_master(link
, &master
) < 0)
992 link_unref(set_remove(master
->slaves
, link
));
995 static int link_drop_requests(Link
*link
) {
1000 assert(link
->manager
);
1002 ORDERED_SET_FOREACH(req
, link
->manager
->request_queue
) {
1003 if (req
->link
!= link
)
1006 /* If the request is already called, but its reply is not received, then we need to
1007 * drop the configuration (e.g. address) here. Note, if the configuration is known,
1008 * it will be handled later by link_drop_foreign_addresses() or so. */
1009 if (req
->waiting_reply
&& link
->state
!= LINK_STATE_LINGER
)
1010 switch (req
->type
) {
1011 case REQUEST_TYPE_ADDRESS
: {
1012 Address
*address
= ASSERT_PTR(req
->userdata
);
1014 if (address_get(link
, address
, NULL
) < 0)
1015 RET_GATHER(ret
, address_remove(address
, link
));
1018 case REQUEST_TYPE_NEIGHBOR
: {
1019 Neighbor
*neighbor
= ASSERT_PTR(req
->userdata
);
1021 if (neighbor_get(link
, neighbor
, NULL
) < 0)
1022 RET_GATHER(ret
, neighbor_remove(neighbor
, link
));
1025 case REQUEST_TYPE_NEXTHOP
: {
1026 NextHop
*nexthop
= ASSERT_PTR(req
->userdata
);
1028 if (nexthop_get_by_id(link
->manager
, nexthop
->id
, NULL
) < 0)
1029 RET_GATHER(ret
, nexthop_remove(nexthop
, link
->manager
));
1032 case REQUEST_TYPE_ROUTE
: {
1033 Route
*route
= ASSERT_PTR(req
->userdata
);
1035 if (route_get(link
->manager
, route
, NULL
) < 0)
1036 RET_GATHER(ret
, route_remove(route
, link
->manager
));
1043 request_detach(req
);
1049 static Link
*link_drop(Link
*link
) {
1053 assert(link
->manager
);
1055 link_set_state(link
, LINK_STATE_LINGER
);
1057 /* Drop all references from other links and manager. Note that async netlink calls may have
1058 * references to the link, and they will be dropped when we receive replies. */
1060 (void) link_drop_requests(link
);
1062 link_free_bound_to_list(link
);
1063 link_free_bound_by_list(link
);
1065 link_clear_sr_iov_ifindices(link
);
1067 link_drop_from_master(link
);
1069 if (link
->state_file
)
1070 (void) unlink(link
->state_file
);
1074 STRV_FOREACH(n
, link
->alternative_names
)
1075 hashmap_remove(link
->manager
->links_by_name
, *n
);
1076 hashmap_remove(link
->manager
->links_by_name
, link
->ifname
);
1078 /* bonding master and its slaves have the same hardware address. */
1079 hashmap_remove_value(link
->manager
->links_by_hw_addr
, &link
->hw_addr
, link
);
1081 /* The following must be called at last. */
1082 assert_se(hashmap_remove(link
->manager
->links_by_index
, INT_TO_PTR(link
->ifindex
)) == link
);
1083 return link_unref(link
);
1086 static int link_drop_foreign_config(Link
*link
) {
1090 assert(link
->manager
);
1092 /* Drop foreign config, but ignore unmanaged, loopback, or critical interfaces. We do not want
1093 * to remove loopback address or addresses used for root NFS. */
1095 if (IN_SET(link
->state
, LINK_STATE_UNMANAGED
, LINK_STATE_PENDING
, LINK_STATE_INITIALIZED
))
1097 if (FLAGS_SET(link
->flags
, IFF_LOOPBACK
))
1099 if (link
->network
->keep_configuration
== KEEP_CONFIGURATION_YES
)
1102 r
= link_drop_foreign_routes(link
);
1104 RET_GATHER(r
, link_drop_foreign_nexthops(link
));
1105 RET_GATHER(r
, link_drop_foreign_addresses(link
));
1106 RET_GATHER(r
, link_drop_foreign_neighbors(link
));
1107 RET_GATHER(r
, manager_drop_foreign_routing_policy_rules(link
->manager
));
1112 static int link_drop_managed_config(Link
*link
) {
1116 assert(link
->manager
);
1118 r
= link_drop_managed_routes(link
);
1120 RET_GATHER(r
, link_drop_managed_nexthops(link
));
1121 RET_GATHER(r
, link_drop_managed_addresses(link
));
1122 RET_GATHER(r
, link_drop_managed_neighbors(link
));
1123 RET_GATHER(r
, link_drop_managed_routing_policy_rules(link
));
1128 static void link_foreignize_config(Link
*link
) {
1130 assert(link
->manager
);
1132 link_foreignize_routes(link
);
1133 link_foreignize_nexthops(link
);
1134 link_foreignize_addresses(link
);
1135 link_foreignize_neighbors(link
);
1136 link_foreignize_routing_policy_rules(link
);
1139 static int link_configure(Link
*link
) {
1143 assert(link
->network
);
1144 assert(link
->state
== LINK_STATE_INITIALIZED
);
1146 link_set_state(link
, LINK_STATE_CONFIGURING
);
1148 r
= link_new_bound_to_list(link
);
1152 r
= link_request_traffic_control(link
);
1156 r
= link_configure_mtu(link
);
1160 if (link
->iftype
== ARPHRD_CAN
) {
1161 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1162 r
= link_request_to_set_can(link
);
1166 return link_request_to_activate(link
);
1169 r
= link_request_sr_iov_vfs(link
);
1173 r
= link_set_sysctl(link
);
1177 r
= link_request_to_set_mac(link
, /* allow_retry = */ true);
1181 r
= link_request_to_set_ipoib(link
);
1185 r
= link_request_to_set_flags(link
);
1189 r
= link_request_to_set_group(link
);
1193 r
= link_request_to_set_addrgen_mode(link
);
1197 r
= link_request_to_set_master(link
);
1201 r
= link_request_stacked_netdevs(link
);
1205 r
= link_request_to_set_bond(link
);
1209 r
= link_request_to_set_bridge(link
);
1213 r
= link_request_to_set_bridge_vlan(link
);
1217 r
= link_request_to_activate(link
);
1221 r
= ipv4ll_configure(link
);
1225 r
= link_request_dhcp4_client(link
);
1229 r
= link_request_dhcp6_client(link
);
1233 r
= link_request_ndisc(link
);
1237 r
= link_request_dhcp_server(link
);
1241 r
= link_request_radv(link
);
1245 r
= link_lldp_rx_configure(link
);
1249 r
= link_lldp_tx_configure(link
);
1253 r
= link_drop_foreign_config(link
);
1257 r
= link_request_static_configs(link
);
1261 if (!link_has_carrier(link
))
1264 return link_acquire_dynamic_conf(link
);
1267 static int link_get_network(Link
*link
, Network
**ret
) {
1272 assert(link
->manager
);
1275 ORDERED_HASHMAP_FOREACH(network
, link
->manager
->networks
) {
1278 r
= net_match_config(
1282 &link
->permanent_hw_addr
,
1287 link
->alternative_names
,
1296 if (network
->match
.ifname
&& link
->dev
) {
1297 uint8_t name_assign_type
= NET_NAME_UNKNOWN
;
1300 if (sd_device_get_sysattr_value(link
->dev
, "name_assign_type", &attr
) >= 0)
1301 (void) safe_atou8(attr
, &name_assign_type
);
1303 warn
= name_assign_type
== NET_NAME_ENUM
;
1306 log_link_full(link
, warn
? LOG_WARNING
: LOG_DEBUG
,
1307 "found matching network '%s'%s.",
1309 warn
? ", based on potentially unpredictable interface name" : "");
1311 if (network
->unmanaged
)
1321 int link_reconfigure_impl(Link
*link
, bool force
) {
1322 Network
*network
= NULL
;
1323 NetDev
*netdev
= NULL
;
1328 if (IN_SET(link
->state
, LINK_STATE_PENDING
, LINK_STATE_LINGER
))
1331 r
= netdev_get(link
->manager
, link
->ifname
, &netdev
);
1332 if (r
< 0 && r
!= -ENOENT
)
1335 r
= link_get_network(link
, &network
);
1336 if (r
< 0 && r
!= -ENOENT
)
1339 if (link
->state
!= LINK_STATE_UNMANAGED
&& !network
)
1340 /* If link is in initialized state, then link->network is also NULL. */
1343 if (link
->network
== network
&& !force
)
1347 _cleanup_free_
char *joined
= strv_join(network
->dropins
, ", ");
1349 if (link
->state
== LINK_STATE_INITIALIZED
)
1350 log_link_info(link
, "Configuring with %s%s%s%s.",
1352 isempty(joined
) ? "" : " (dropins: ",
1354 isempty(joined
) ? "" : ")");
1356 log_link_info(link
, "Reconfiguring with %s%s%s%s.",
1358 isempty(joined
) ? "" : " (dropins: ",
1360 isempty(joined
) ? "" : ")");
1362 log_link_full(link
, link
->state
== LINK_STATE_INITIALIZED
? LOG_DEBUG
: LOG_INFO
,
1363 "Unmanaging interface.");
1365 /* Dropping old .network file */
1366 r
= link_stop_engines(link
, false);
1370 r
= link_drop_requests(link
);
1374 if (network
&& !force
&& network
->keep_configuration
!= KEEP_CONFIGURATION_YES
)
1375 /* When a new/updated .network file is assigned, first make all configs (addresses,
1376 * routes, and so on) foreign, and then drop unnecessary configs later by
1377 * link_drop_foreign_config() in link_configure().
1378 * Note, when KeepConfiguration=yes, link_drop_foreign_config() does nothing. Hence,
1379 * here we need to drop the configs such as addresses, routes, and so on configured by
1380 * the previously assigned .network file. */
1381 link_foreignize_config(link
);
1383 /* Remove all managed configs. Note, foreign configs are removed in later by
1384 * link_configure() -> link_drop_foreign_config() if the link is managed by us. */
1385 r
= link_drop_managed_config(link
);
1390 /* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the
1391 * bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will
1392 * not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the
1393 * map here, as it depends on .network files assigned to other links. */
1394 link_free_bound_to_list(link
);
1396 link_free_engines(link
);
1397 link
->network
= network_unref(link
->network
);
1399 netdev_unref(link
->netdev
);
1400 link
->netdev
= netdev_ref(netdev
);
1403 link_set_state(link
, LINK_STATE_UNMANAGED
);
1407 /* Then, apply new .network file */
1408 link
->network
= network_ref(network
);
1409 link_update_operstate(link
, true);
1412 link_set_state(link
, LINK_STATE_INITIALIZED
);
1413 link
->activated
= false;
1415 r
= link_configure(link
);
1422 static int link_reconfigure_handler_internal(sd_netlink
*rtnl
, sd_netlink_message
*m
, Link
*link
, bool force
) {
1427 r
= link_getlink_handler_internal(rtnl
, m
, link
, "Failed to update link state");
1431 r
= link_reconfigure_impl(link
, force
);
1433 link_enter_failed(link
);
1440 static int link_reconfigure_handler(sd_netlink
*rtnl
, sd_netlink_message
*m
, Link
*link
) {
1441 return link_reconfigure_handler_internal(rtnl
, m
, link
, /* force = */ false);
1444 static int link_force_reconfigure_handler(sd_netlink
*rtnl
, sd_netlink_message
*m
, Link
*link
) {
1445 return link_reconfigure_handler_internal(rtnl
, m
, link
, /* force = */ true);
1448 int link_reconfigure(Link
*link
, bool force
) {
1453 /* When link in pending or initialized state, then link_configure() will be called. To prevent
1454 * the function from being called multiple times simultaneously, refuse to reconfigure the
1455 * interface in these cases. */
1456 if (IN_SET(link
->state
, LINK_STATE_PENDING
, LINK_STATE_INITIALIZED
, LINK_STATE_LINGER
))
1457 return 0; /* 0 means no-op. */
1459 r
= link_call_getlink(link
, force
? link_force_reconfigure_handler
: link_reconfigure_handler
);
1463 return 1; /* 1 means the interface will be reconfigured. */
1466 typedef struct ReconfigureData
{
1469 sd_bus_message
*message
;
1472 static void reconfigure_data_destroy_callback(ReconfigureData
*data
) {
1477 assert(data
->manager
);
1478 assert(data
->manager
->reloading
> 0);
1479 assert(data
->message
);
1481 link_unref(data
->link
);
1483 data
->manager
->reloading
--;
1484 if (data
->manager
->reloading
<= 0) {
1485 r
= sd_bus_reply_method_return(data
->message
, NULL
);
1487 log_warning_errno(r
, "Failed to send reply for 'Reload' DBus method, ignoring: %m");
1490 sd_bus_message_unref(data
->message
);
1494 static int reconfigure_handler_on_bus_method_reload(sd_netlink
*rtnl
, sd_netlink_message
*m
, ReconfigureData
*data
) {
1497 return link_reconfigure_handler_internal(rtnl
, m
, data
->link
, /* force = */ false);
1500 int link_reconfigure_on_bus_method_reload(Link
*link
, sd_bus_message
*message
) {
1501 _cleanup_(sd_netlink_message_unrefp
) sd_netlink_message
*req
= NULL
;
1502 _cleanup_free_ ReconfigureData
*data
= NULL
;
1506 assert(link
->manager
);
1507 assert(link
->manager
->rtnl
);
1510 /* See comments in link_reconfigure() above. */
1511 if (IN_SET(link
->state
, LINK_STATE_PENDING
, LINK_STATE_INITIALIZED
, LINK_STATE_LINGER
))
1514 r
= sd_rtnl_message_new_link(link
->manager
->rtnl
, &req
, RTM_GETLINK
, link
->ifindex
);
1518 data
= new(ReconfigureData
, 1);
1522 r
= netlink_call_async(link
->manager
->rtnl
, NULL
, req
,
1523 reconfigure_handler_on_bus_method_reload
,
1524 reconfigure_data_destroy_callback
, data
);
1528 *data
= (ReconfigureData
) {
1529 .link
= link_ref(link
),
1530 .manager
= link
->manager
,
1531 .message
= sd_bus_message_ref(message
),
1534 link
->manager
->reloading
++;
1540 static int link_initialized_and_synced(Link
*link
) {
1544 assert(link
->manager
);
1546 if (link
->manager
->test_mode
) {
1547 log_link_debug(link
, "Running in test mode, refusing to enter initialized state.");
1548 link_set_state(link
, LINK_STATE_UNMANAGED
);
1552 if (link
->state
== LINK_STATE_PENDING
) {
1553 log_link_debug(link
, "Link state is up-to-date");
1554 link_set_state(link
, LINK_STATE_INITIALIZED
);
1556 r
= link_new_bound_by_list(link
);
1560 r
= link_handle_bound_by_list(link
);
1565 return link_reconfigure_impl(link
, /* force = */ false);
1568 static int link_initialized_handler(sd_netlink
*rtnl
, sd_netlink_message
*m
, Link
*link
) {
1571 r
= link_getlink_handler_internal(rtnl
, m
, link
, "Failed to wait for the interface to be initialized");
1575 r
= link_initialized_and_synced(link
);
1577 link_enter_failed(link
);
1582 static int link_initialized(Link
*link
, sd_device
*device
) {
1588 /* Always replace with the new sd_device object. As the sysname (and possibly other properties
1589 * or sysattrs) may be outdated. */
1590 device_unref_and_replace(link
->dev
, device
);
1592 if (link
->dhcp_client
) {
1593 r
= sd_dhcp_client_attach_device(link
->dhcp_client
, link
->dev
);
1595 log_link_warning_errno(link
, r
, "Failed to attach device to DHCPv4 client, ignoring: %m");
1598 if (link
->dhcp6_client
) {
1599 r
= sd_dhcp6_client_attach_device(link
->dhcp6_client
, link
->dev
);
1601 log_link_warning_errno(link
, r
, "Failed to attach device to DHCPv6 client, ignoring: %m");
1604 r
= link_set_sr_iov_ifindices(link
);
1606 log_link_warning_errno(link
, r
, "Failed to manage SR-IOV PF and VF ports, ignoring: %m");
1608 if (link
->state
!= LINK_STATE_PENDING
)
1609 return link_reconfigure(link
, /* force = */ false);
1611 log_link_debug(link
, "udev initialized link");
1613 /* udev has initialized the link, but we don't know if we have yet
1614 * processed the NEWLINK messages with the latest state. Do a GETLINK,
1615 * when it returns we know that the pending NEWLINKs have already been
1616 * processed and that we are up-to-date */
1618 return link_call_getlink(link
, link_initialized_handler
);
1621 static int link_check_initialized(Link
*link
) {
1622 _cleanup_(sd_device_unrefp
) sd_device
*device
= NULL
;
1627 if (!udev_available())
1628 return link_initialized_and_synced(link
);
1630 /* udev should be around */
1631 r
= sd_device_new_from_ifindex(&device
, link
->ifindex
);
1633 log_link_debug_errno(link
, r
, "Could not find device, waiting for device initialization: %m");
1637 r
= sd_device_get_is_initialized(device
);
1639 return log_link_warning_errno(link
, r
, "Could not determine whether the device is initialized: %m");
1642 log_link_debug(link
, "link pending udev initialization...");
1646 r
= device_is_renaming(device
);
1648 return log_link_warning_errno(link
, r
, "Failed to determine the device is being renamed: %m");
1650 log_link_debug(link
, "Interface is being renamed, pending initialization.");
1654 r
= device_is_processing(device
);
1656 return log_link_warning_errno(link
, r
, "Failed to determine whether the device is being processed: %m");
1658 log_link_debug(link
, "Interface is being processed by udevd, pending initialization.");
1662 return link_initialized(link
, device
);
1665 int manager_udev_process_link(Manager
*m
, sd_device
*device
, sd_device_action_t action
) {
1673 r
= sd_device_get_ifindex(device
, &ifindex
);
1675 return log_device_debug_errno(device
, r
, "Failed to get ifindex: %m");
1677 r
= link_get_by_index(m
, ifindex
, &link
);
1679 /* This error is not critical, as the corresponding rtnl message may be received later. */
1680 log_device_debug_errno(device
, r
, "Failed to get link from ifindex %i, ignoring: %m", ifindex
);
1684 /* Let's unref the sd-device object assigned to the corresponding Link object, but keep the Link
1685 * object here. It will be removed only when rtnetlink says so. */
1686 if (action
== SD_DEVICE_REMOVE
) {
1687 link
->dev
= sd_device_unref(link
->dev
);
1691 r
= device_is_renaming(device
);
1693 return log_device_debug_errno(device
, r
, "Failed to determine if the device is renaming or not: %m");
1695 log_device_debug(device
, "Device is renaming, waiting for the interface to be renamed.");
1697 * What happens when a device is initialized, then soon renamed after that? When we detect
1698 * such, maybe we should cancel or postpone all queued requests for the interface. */
1702 r
= sd_device_get_property_value(device
, "ID_NET_MANAGED_BY", &s
);
1703 if (r
< 0 && r
!= -ENOENT
)
1704 log_device_debug_errno(device
, r
, "Failed to get ID_NET_MANAGED_BY udev property, ignoring: %m");
1705 if (r
>= 0 && !streq(s
, "io.systemd.Network")) {
1706 log_device_debug(device
, "Interface is requested to be managed by '%s', not managing the interface.", s
);
1707 link_set_state(link
, LINK_STATE_UNMANAGED
);
1711 r
= link_initialized(link
, device
);
1713 link_enter_failed(link
);
1718 static int link_carrier_gained(Link
*link
) {
1719 bool force_reconfigure
;
1724 r
= event_source_disable(link
->carrier_lost_timer
);
1726 log_link_warning_errno(link
, r
, "Failed to disable carrier lost timer, ignoring: %m");
1728 /* If a wireless interface was connected to an access point, and the SSID is changed (that is,
1729 * both previous_ssid and ssid are non-NULL), then the connected wireless network could be
1730 * changed. So, always reconfigure the link. Which means e.g. the DHCP client will be
1731 * restarted, and the correct network information will be gained.
1733 * However, do not reconfigure the wireless interface forcibly if it was not connected to any
1734 * access points previously (previous_ssid is NULL in this case). As, a .network file may be
1735 * already assigned to the interface (in that case, the .network file does not have the SSID=
1736 * setting in the [Match] section), and the interface is already being configured. Of course,
1737 * there may exist another .network file with higher priority and a matching SSID= setting. But
1738 * in that case, link_reconfigure_impl() can handle that without the force_reconfigure flag.
1740 * For non-wireless interfaces, we have no way to detect the connected network change. So,
1741 * setting force_reconfigure = false. Note, both ssid and previous_ssid are NULL in that case. */
1742 force_reconfigure
= link
->previous_ssid
&& !streq_ptr(link
->previous_ssid
, link
->ssid
);
1743 link
->previous_ssid
= mfree(link
->previous_ssid
);
1745 /* AP and P2P-GO interfaces may have a new SSID - update the link properties in case a new .network
1746 * profile wants to match on it with SSID= in its [Match] section.
1748 if (IN_SET(link
->wlan_iftype
, NL80211_IFTYPE_AP
, NL80211_IFTYPE_P2P_GO
)) {
1749 r
= link_get_wlan_interface(link
);
1754 /* At this stage, both wlan and link information should be up-to-date. Hence, it is not necessary to
1755 * call RTM_GETLINK, NL80211_CMD_GET_INTERFACE, or NL80211_CMD_GET_STATION commands, and simply call
1756 * link_reconfigure_impl(). Note, link_reconfigure_impl() returns 1 when the link is reconfigured. */
1757 r
= link_reconfigure_impl(link
, force_reconfigure
);
1761 r
= link_handle_bound_by_list(link
);
1765 if (link
->iftype
== ARPHRD_CAN
)
1766 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1769 if (IN_SET(link
->state
, LINK_STATE_CONFIGURING
, LINK_STATE_CONFIGURED
)) {
1770 r
= link_acquire_dynamic_conf(link
);
1774 r
= link_request_static_configs(link
);
1782 static int link_carrier_lost_impl(Link
*link
) {
1787 link
->previous_ssid
= mfree(link
->previous_ssid
);
1789 if (IN_SET(link
->state
, LINK_STATE_FAILED
, LINK_STATE_LINGER
))
1795 r
= link_stop_engines(link
, false);
1799 r
= link_drop_managed_config(link
);
1800 if (r
< 0 && ret
>= 0)
1806 static int link_carrier_lost_handler(sd_event_source
*s
, uint64_t usec
, void *userdata
) {
1807 Link
*link
= ASSERT_PTR(userdata
);
1810 r
= link_carrier_lost_impl(link
);
1812 log_link_warning_errno(link
, r
, "Failed to process carrier lost event: %m");
1813 link_enter_failed(link
);
1819 static int link_carrier_lost(Link
*link
) {
1826 r
= link_handle_bound_by_list(link
);
1830 if (link
->iftype
== ARPHRD_CAN
)
1831 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1837 if (link
->network
->ignore_carrier_loss_set
)
1838 /* If IgnoreCarrierLoss= is explicitly specified, then use the specified value. */
1839 usec
= link
->network
->ignore_carrier_loss_usec
;
1841 else if (link
->network
->bond
&& link
->wlan_iftype
> 0)
1842 /* Enslaving wlan interface to a bond disconnects from the connected AP, and causes its
1843 * carrier to be lost. See #19832. */
1844 usec
= 3 * USEC_PER_SEC
;
1846 else if (link
->network
->dhcp_use_mtu
&&
1848 sd_dhcp_lease_get_mtu(link
->dhcp_lease
, &dhcp_mtu
) >= 0 &&
1849 dhcp_mtu
!= link
->original_mtu
)
1850 /* Some drivers reset interfaces when changing MTU. Resetting interfaces by the static
1851 * MTU should not cause any issues, as MTU is changed only once. However, setting MTU
1852 * through DHCP lease causes an infinite loop of resetting the interface. See #18738. */
1853 usec
= 5 * USEC_PER_SEC
;
1856 /* Otherwise, use the implied default value. */
1857 usec
= link
->network
->ignore_carrier_loss_usec
;
1859 if (usec
== USEC_INFINITY
)
1863 return link_carrier_lost_impl(link
);
1865 return event_reset_time_relative(link
->manager
->event
,
1866 &link
->carrier_lost_timer
,
1870 link_carrier_lost_handler
,
1873 "link-carrier-loss",
1877 static int link_admin_state_up(Link
*link
) {
1882 /* This is called every time an interface admin state changes to up;
1883 * specifically, when IFF_UP flag changes from unset to set. */
1888 if (link
->activated
&& link
->network
->activation_policy
== ACTIVATION_POLICY_ALWAYS_DOWN
) {
1889 log_link_info(link
, "Activation policy is \"always-down\", forcing link down.");
1890 return link_request_to_bring_up_or_down(link
, /* up = */ false);
1893 /* We set the ipv6 mtu after the device mtu, but the kernel resets
1894 * ipv6 mtu on NETDEV_UP, so we need to reset it. */
1895 r
= link_set_ipv6_mtu(link
);
1897 log_link_warning_errno(link
, r
, "Cannot set IPv6 MTU, ignoring: %m");
1902 static int link_admin_state_down(Link
*link
) {
1908 if (link
->activated
&& link
->network
->activation_policy
== ACTIVATION_POLICY_ALWAYS_UP
) {
1909 log_link_info(link
, "Activation policy is \"always-up\", forcing link up.");
1910 return link_request_to_bring_up_or_down(link
, /* up = */ true);
1916 static bool link_is_enslaved(Link
*link
) {
1917 if (link
->flags
& IFF_SLAVE
)
1920 if (link
->master_ifindex
> 0)
1926 void link_update_operstate(Link
*link
, bool also_update_master
) {
1927 LinkOperationalState operstate
;
1928 LinkCarrierState carrier_state
;
1929 LinkAddressState ipv4_address_state
, ipv6_address_state
, address_state
;
1930 LinkOnlineState online_state
;
1931 _cleanup_strv_free_
char **p
= NULL
;
1932 bool changed
= false;
1936 if (link
->kernel_operstate
== IF_OPER_DORMANT
)
1937 carrier_state
= LINK_CARRIER_STATE_DORMANT
;
1938 else if (link_has_carrier(link
)) {
1939 if (link_is_enslaved(link
))
1940 carrier_state
= LINK_CARRIER_STATE_ENSLAVED
;
1942 carrier_state
= LINK_CARRIER_STATE_CARRIER
;
1943 } else if (link
->flags
& IFF_UP
)
1944 carrier_state
= LINK_CARRIER_STATE_NO_CARRIER
;
1946 carrier_state
= LINK_CARRIER_STATE_OFF
;
1948 if (carrier_state
>= LINK_CARRIER_STATE_CARRIER
) {
1951 SET_FOREACH(slave
, link
->slaves
) {
1952 link_update_operstate(slave
, false);
1954 if (slave
->carrier_state
< LINK_CARRIER_STATE_CARRIER
)
1955 carrier_state
= LINK_CARRIER_STATE_DEGRADED_CARRIER
;
1959 link_get_address_states(link
, &ipv4_address_state
, &ipv6_address_state
, &address_state
);
1961 /* Mapping of address and carrier state vs operational state
1963 * | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
1964 * ------------------------------------------------------------------------------
1965 * off | off | no-carrier | dormant | degraded-carrier | carrier | enslaved
1966 * address_state degraded | off | no-carrier | dormant | degraded | degraded | enslaved
1967 * routable | off | no-carrier | dormant | routable | routable | routable
1970 if (carrier_state
== LINK_CARRIER_STATE_DEGRADED_CARRIER
&& address_state
== LINK_ADDRESS_STATE_ROUTABLE
)
1971 operstate
= LINK_OPERSTATE_ROUTABLE
;
1972 else if (carrier_state
== LINK_CARRIER_STATE_DEGRADED_CARRIER
&& address_state
== LINK_ADDRESS_STATE_DEGRADED
)
1973 operstate
= LINK_OPERSTATE_DEGRADED
;
1974 else if (carrier_state
< LINK_CARRIER_STATE_CARRIER
|| address_state
== LINK_ADDRESS_STATE_OFF
)
1975 operstate
= (LinkOperationalState
) carrier_state
;
1976 else if (address_state
== LINK_ADDRESS_STATE_ROUTABLE
)
1977 operstate
= LINK_OPERSTATE_ROUTABLE
;
1978 else if (carrier_state
== LINK_CARRIER_STATE_CARRIER
)
1979 operstate
= LINK_OPERSTATE_DEGRADED
;
1981 operstate
= LINK_OPERSTATE_ENSLAVED
;
1983 LinkOperationalStateRange req
;
1984 link_required_operstate_for_online(link
, &req
);
1986 /* Only determine online state for managed links with RequiredForOnline=yes */
1987 if (!link
->network
|| !link
->network
->required_for_online
)
1988 online_state
= _LINK_ONLINE_STATE_INVALID
;
1990 else if (!operational_state_is_in_range(operstate
, &req
))
1991 online_state
= LINK_ONLINE_STATE_OFFLINE
;
1994 AddressFamily required_family
= link_required_family_for_online(link
);
1995 bool needs_ipv4
= required_family
& ADDRESS_FAMILY_IPV4
;
1996 bool needs_ipv6
= required_family
& ADDRESS_FAMILY_IPV6
;
1998 /* The operational state is within the range required for online.
1999 * If a particular address family is also required, we might revert
2000 * to offline in the blocks below. */
2001 online_state
= LINK_ONLINE_STATE_ONLINE
;
2003 if (req
.min
>= LINK_OPERSTATE_DEGRADED
) {
2004 if (needs_ipv4
&& ipv4_address_state
< LINK_ADDRESS_STATE_DEGRADED
)
2005 online_state
= LINK_ONLINE_STATE_OFFLINE
;
2006 if (needs_ipv6
&& ipv6_address_state
< LINK_ADDRESS_STATE_DEGRADED
)
2007 online_state
= LINK_ONLINE_STATE_OFFLINE
;
2010 if (req
.min
>= LINK_OPERSTATE_ROUTABLE
) {
2011 if (needs_ipv4
&& ipv4_address_state
< LINK_ADDRESS_STATE_ROUTABLE
)
2012 online_state
= LINK_ONLINE_STATE_OFFLINE
;
2013 if (needs_ipv6
&& ipv6_address_state
< LINK_ADDRESS_STATE_ROUTABLE
)
2014 online_state
= LINK_ONLINE_STATE_OFFLINE
;
2018 if (link
->carrier_state
!= carrier_state
) {
2019 link
->carrier_state
= carrier_state
;
2021 if (strv_extend(&p
, "CarrierState") < 0)
2025 if (link
->address_state
!= address_state
) {
2026 link
->address_state
= address_state
;
2028 if (strv_extend(&p
, "AddressState") < 0)
2032 if (link
->ipv4_address_state
!= ipv4_address_state
) {
2033 link
->ipv4_address_state
= ipv4_address_state
;
2035 if (strv_extend(&p
, "IPv4AddressState") < 0)
2039 if (link
->ipv6_address_state
!= ipv6_address_state
) {
2040 link
->ipv6_address_state
= ipv6_address_state
;
2042 if (strv_extend(&p
, "IPv6AddressState") < 0)
2046 if (link
->operstate
!= operstate
) {
2047 link
->operstate
= operstate
;
2049 if (strv_extend(&p
, "OperationalState") < 0)
2053 if (link
->online_state
!= online_state
) {
2054 link
->online_state
= online_state
;
2056 if (strv_extend(&p
, "OnlineState") < 0)
2061 link_send_changed_strv(link
, p
);
2065 if (also_update_master
) {
2068 if (link_get_master(link
, &master
) >= 0)
2069 link_update_operstate(master
, true);
2073 #define FLAG_STRING(string, flag, old, new) \
2074 (((old ^ new) & flag) \
2075 ? ((old & flag) ? (" -" string) : (" +" string)) \
2078 static int link_update_flags(Link
*link
, sd_netlink_message
*message
) {
2079 bool link_was_admin_up
, had_carrier
;
2087 r
= sd_rtnl_message_link_get_flags(message
, &flags
);
2089 return log_link_debug_errno(link
, r
, "rtnl: failed to read link flags: %m");
2091 r
= sd_netlink_message_read_u8(message
, IFLA_OPERSTATE
, &operstate
);
2093 /* If we got a message without operstate, assume the state was unchanged. */
2094 operstate
= link
->kernel_operstate
;
2096 return log_link_debug_errno(link
, r
, "rtnl: failed to read operational state: %m");
2098 if (link
->flags
== flags
&& link
->kernel_operstate
== operstate
)
2101 if (link
->flags
!= flags
) {
2102 unsigned unknown_flags
, unknown_flags_added
, unknown_flags_removed
;
2104 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",
2105 FLAG_STRING("LOOPBACK", IFF_LOOPBACK
, link
->flags
, flags
),
2106 FLAG_STRING("MASTER", IFF_MASTER
, link
->flags
, flags
),
2107 FLAG_STRING("SLAVE", IFF_SLAVE
, link
->flags
, flags
),
2108 FLAG_STRING("UP", IFF_UP
, link
->flags
, flags
),
2109 FLAG_STRING("DORMANT", IFF_DORMANT
, link
->flags
, flags
),
2110 FLAG_STRING("LOWER_UP", IFF_LOWER_UP
, link
->flags
, flags
),
2111 FLAG_STRING("RUNNING", IFF_RUNNING
, link
->flags
, flags
),
2112 FLAG_STRING("MULTICAST", IFF_MULTICAST
, link
->flags
, flags
),
2113 FLAG_STRING("BROADCAST", IFF_BROADCAST
, link
->flags
, flags
),
2114 FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT
, link
->flags
, flags
),
2115 FLAG_STRING("PROMISC", IFF_PROMISC
, link
->flags
, flags
),
2116 FLAG_STRING("ALLMULTI", IFF_ALLMULTI
, link
->flags
, flags
),
2117 FLAG_STRING("PORTSEL", IFF_PORTSEL
, link
->flags
, flags
),
2118 FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA
, link
->flags
, flags
),
2119 FLAG_STRING("DYNAMIC", IFF_DYNAMIC
, link
->flags
, flags
),
2120 FLAG_STRING("NOARP", IFF_NOARP
, link
->flags
, flags
),
2121 FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS
, link
->flags
, flags
),
2122 FLAG_STRING("DEBUG", IFF_DEBUG
, link
->flags
, flags
),
2123 FLAG_STRING("ECHO", IFF_ECHO
, link
->flags
, flags
));
2125 unknown_flags
= ~(IFF_LOOPBACK
| IFF_MASTER
| IFF_SLAVE
| IFF_UP
|
2126 IFF_DORMANT
| IFF_LOWER_UP
| IFF_RUNNING
|
2127 IFF_MULTICAST
| IFF_BROADCAST
| IFF_POINTOPOINT
|
2128 IFF_PROMISC
| IFF_ALLMULTI
| IFF_PORTSEL
|
2129 IFF_AUTOMEDIA
| IFF_DYNAMIC
| IFF_NOARP
|
2130 IFF_NOTRAILERS
| IFF_DEBUG
| IFF_ECHO
);
2131 unknown_flags_added
= ((link
->flags
^ flags
) & flags
& unknown_flags
);
2132 unknown_flags_removed
= ((link
->flags
^ flags
) & link
->flags
& unknown_flags
);
2134 if (unknown_flags_added
)
2135 log_link_debug(link
, "Unknown link flags gained, ignoring: %#.5x", unknown_flags_added
);
2137 if (unknown_flags_removed
)
2138 log_link_debug(link
, "Unknown link flags lost, ignoring: %#.5x", unknown_flags_removed
);
2141 link_was_admin_up
= link
->flags
& IFF_UP
;
2142 had_carrier
= link_has_carrier(link
);
2144 link
->flags
= flags
;
2145 link
->kernel_operstate
= operstate
;
2147 link_update_operstate(link
, true);
2149 if (!link_was_admin_up
&& (link
->flags
& IFF_UP
)) {
2150 log_link_info(link
, "Link UP");
2152 r
= link_admin_state_up(link
);
2155 } else if (link_was_admin_up
&& !(link
->flags
& IFF_UP
)) {
2156 log_link_info(link
, "Link DOWN");
2158 r
= link_admin_state_down(link
);
2163 if (!had_carrier
&& link_has_carrier(link
)) {
2164 log_link_info(link
, "Gained carrier");
2166 r
= link_carrier_gained(link
);
2169 } else if (had_carrier
&& !link_has_carrier(link
)) {
2170 log_link_info(link
, "Lost carrier");
2172 r
= link_carrier_lost(link
);
2180 static int link_update_master(Link
*link
, sd_netlink_message
*message
) {
2181 int master_ifindex
, r
;
2186 r
= sd_netlink_message_read_u32(message
, IFLA_MASTER
, (uint32_t*) &master_ifindex
);
2190 return log_link_debug_errno(link
, r
, "rtnl: failed to read master ifindex: %m");
2192 if (master_ifindex
== link
->ifindex
)
2195 if (master_ifindex
!= link
->master_ifindex
) {
2196 if (link
->master_ifindex
== 0)
2197 log_link_debug(link
, "Attached to master interface: %i", master_ifindex
);
2198 else if (master_ifindex
== 0)
2199 log_link_debug(link
, "Detached from master interface: %i", link
->master_ifindex
);
2201 log_link_debug(link
, "Master interface changed: %i %s %i", link
->master_ifindex
,
2202 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT
), master_ifindex
);
2204 link_drop_from_master(link
);
2205 link
->master_ifindex
= master_ifindex
;
2208 r
= link_append_to_master(link
);
2210 return log_link_debug_errno(link
, r
, "Failed to append link to master: %m");
2215 static int link_update_driver(Link
*link
, sd_netlink_message
*message
) {
2219 assert(link
->manager
);
2222 /* Driver is already read. Assuming the driver is never changed. */
2223 if (link
->ethtool_driver_read
)
2226 /* When udevd is running, read the driver after the interface is initialized by udevd.
2227 * Otherwise, ethtool may not work correctly. See issue #22538.
2228 * When udevd is not running, read the value when the interface is detected. */
2229 if (udev_available() && !link
->dev
)
2232 link
->ethtool_driver_read
= true;
2234 r
= ethtool_get_driver(&link
->manager
->ethtool_fd
, link
->ifname
, &link
->driver
);
2236 log_link_debug_errno(link
, r
, "Failed to get driver, continuing without: %m");
2240 log_link_debug(link
, "Found driver: %s", strna(link
->driver
));
2242 if (streq_ptr(link
->driver
, "dsa")) {
2243 uint32_t dsa_master_ifindex
= 0;
2245 r
= sd_netlink_message_read_u32(message
, IFLA_LINK
, &dsa_master_ifindex
);
2246 if (r
< 0 && r
!= -ENODATA
)
2247 return log_link_debug_errno(link
, r
, "rtnl: failed to read ifindex of the DSA master interface: %m");
2249 if (dsa_master_ifindex
> INT_MAX
) {
2250 log_link_debug(link
, "rtnl: received too large DSA master ifindex (%"PRIu32
" > INT_MAX), ignoring.",
2251 dsa_master_ifindex
);
2252 dsa_master_ifindex
= 0;
2255 link
->dsa_master_ifindex
= (int) dsa_master_ifindex
;
2258 return 1; /* needs reconfigure */
2261 static int link_update_permanent_hardware_address_from_ethtool(Link
*link
, sd_netlink_message
*message
) {
2265 assert(link
->manager
);
2268 if (link
->ethtool_permanent_hw_addr_read
)
2271 /* When udevd is running, read the permanent hardware address after the interface is
2272 * initialized by udevd. Otherwise, ethtool may not work correctly. See issue #22538.
2273 * When udevd is not running, read the value when the interface is detected. */
2274 if (udev_available() && !link
->dev
)
2277 /* If the interface does not have a hardware address, then it will not have a permanent address either. */
2278 r
= netlink_message_read_hw_addr(message
, IFLA_ADDRESS
, NULL
);
2282 return log_link_debug_errno(link
, r
, "Failed to read IFLA_ADDRESS attribute: %m");
2284 link
->ethtool_permanent_hw_addr_read
= true;
2286 r
= ethtool_get_permanent_hw_addr(&link
->manager
->ethtool_fd
, link
->ifname
, &link
->permanent_hw_addr
);
2288 log_link_debug_errno(link
, r
, "Permanent hardware address not found, continuing without: %m");
2293 static int link_update_permanent_hardware_address(Link
*link
, sd_netlink_message
*message
) {
2297 assert(link
->manager
);
2300 if (link
->permanent_hw_addr
.length
> 0)
2303 r
= netlink_message_read_hw_addr(message
, IFLA_PERM_ADDRESS
, &link
->permanent_hw_addr
);
2306 return log_link_debug_errno(link
, r
, "Failed to read IFLA_PERM_ADDRESS attribute: %m");
2308 /* Fallback to ethtool for older kernels. */
2309 r
= link_update_permanent_hardware_address_from_ethtool(link
, message
);
2314 if (link
->permanent_hw_addr
.length
> 0)
2315 log_link_debug(link
, "Saved permanent hardware address: %s", HW_ADDR_TO_STR(&link
->permanent_hw_addr
));
2317 return 1; /* needs reconfigure */
2320 static int link_update_hardware_address(Link
*link
, sd_netlink_message
*message
) {
2321 struct hw_addr_data addr
;
2327 r
= netlink_message_read_hw_addr(message
, IFLA_BROADCAST
, &link
->bcast_addr
);
2328 if (r
< 0 && r
!= -ENODATA
)
2329 return log_link_debug_errno(link
, r
, "rtnl: failed to read broadcast address: %m");
2331 r
= netlink_message_read_hw_addr(message
, IFLA_ADDRESS
, &addr
);
2335 return log_link_debug_errno(link
, r
, "rtnl: failed to read hardware address: %m");
2337 if (hw_addr_equal(&link
->hw_addr
, &addr
))
2340 if (link
->hw_addr
.length
== 0)
2341 log_link_debug(link
, "Saved hardware address: %s", HW_ADDR_TO_STR(&addr
));
2343 log_link_debug(link
, "Hardware address is changed: %s %s %s",
2344 HW_ADDR_TO_STR(&link
->hw_addr
),
2345 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT
),
2346 HW_ADDR_TO_STR(&addr
));
2348 hashmap_remove_value(link
->manager
->links_by_hw_addr
, &link
->hw_addr
, link
);
2351 link
->hw_addr
= addr
;
2353 if (!hw_addr_is_null(&link
->hw_addr
)) {
2354 r
= hashmap_ensure_put(&link
->manager
->links_by_hw_addr
, &hw_addr_hash_ops
, &link
->hw_addr
, link
);
2355 if (r
== -EEXIST
&& streq_ptr(link
->kind
, "bond"))
2356 /* bonding master and its slaves have the same hardware address. */
2357 r
= hashmap_replace(link
->manager
->links_by_hw_addr
, &link
->hw_addr
, link
);
2359 log_link_debug_errno(link
, r
, "Failed to manage link by its new hardware address, ignoring: %m");
2362 r
= ipv4acd_update_mac(link
);
2364 return log_link_debug_errno(link
, r
, "Could not update MAC address in IPv4 ACD client: %m");
2366 r
= ipv4ll_update_mac(link
);
2368 return log_link_debug_errno(link
, r
, "Could not update MAC address in IPv4LL client: %m");
2370 r
= dhcp4_update_mac(link
);
2372 return log_link_debug_errno(link
, r
, "Could not update MAC address in DHCP client: %m");
2374 r
= dhcp6_update_mac(link
);
2376 return log_link_debug_errno(link
, r
, "Could not update MAC address in DHCPv6 client: %m");
2378 r
= radv_update_mac(link
);
2380 return log_link_debug_errno(link
, r
, "Could not update MAC address for Router Advertisement: %m");
2382 if (link
->ndisc
&& link
->hw_addr
.length
== ETH_ALEN
) {
2383 r
= sd_ndisc_set_mac(link
->ndisc
, &link
->hw_addr
.ether
);
2385 return log_link_debug_errno(link
, r
, "Could not update MAC for NDisc: %m");
2388 if (link
->lldp_rx
) {
2389 r
= sd_lldp_rx_set_filter_address(link
->lldp_rx
, &link
->hw_addr
.ether
);
2391 return log_link_debug_errno(link
, r
, "Could not update MAC address for LLDP Rx: %m");
2394 if (link
->lldp_tx
) {
2395 r
= sd_lldp_tx_set_hwaddr(link
->lldp_tx
, &link
->hw_addr
.ether
);
2397 return log_link_debug_errno(link
, r
, "Could not update MAC address for LLDP Tx: %m");
2400 return 1; /* needs reconfigure */
2403 static int link_update_mtu(Link
*link
, sd_netlink_message
*message
) {
2404 uint32_t mtu
, min_mtu
= 0, max_mtu
= UINT32_MAX
;
2410 r
= sd_netlink_message_read_u32(message
, IFLA_MTU
, &mtu
);
2414 return log_link_debug_errno(link
, r
, "rtnl: failed to read MTU in RTM_NEWLINK message: %m");
2418 r
= sd_netlink_message_read_u32(message
, IFLA_MIN_MTU
, &min_mtu
);
2419 if (r
< 0 && r
!= -ENODATA
)
2420 return log_link_debug_errno(link
, r
, "rtnl: failed to read minimum MTU in RTM_NEWLINK message: %m");
2422 r
= sd_netlink_message_read_u32(message
, IFLA_MAX_MTU
, &max_mtu
);
2423 if (r
< 0 && r
!= -ENODATA
)
2424 return log_link_debug_errno(link
, r
, "rtnl: failed to read maximum MTU in RTM_NEWLINK message: %m");
2427 max_mtu
= UINT32_MAX
;
2429 link
->min_mtu
= min_mtu
;
2430 link
->max_mtu
= max_mtu
;
2432 if (link
->original_mtu
== 0) {
2433 link
->original_mtu
= mtu
;
2434 log_link_debug(link
, "Saved original MTU %" PRIu32
" (min: %"PRIu32
", max: %"PRIu32
")",
2435 link
->original_mtu
, link
->min_mtu
, link
->max_mtu
);
2438 if (link
->mtu
== mtu
)
2442 log_link_debug(link
, "MTU is changed: %"PRIu32
" %s %"PRIu32
" (min: %"PRIu32
", max: %"PRIu32
")",
2443 link
->mtu
, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT
), mtu
,
2444 link
->min_mtu
, link
->max_mtu
);
2448 if (link
->dhcp_client
) {
2449 r
= sd_dhcp_client_set_mtu(link
->dhcp_client
, link
->mtu
);
2451 return log_link_debug_errno(link
, r
, "Could not update MTU in DHCP client: %m");
2455 r
= sd_radv_set_mtu(link
->radv
, link
->mtu
);
2457 return log_link_debug_errno(link
, r
, "Could not set MTU for Router Advertisement: %m");
2463 static int link_update_alternative_names(Link
*link
, sd_netlink_message
*message
) {
2464 _cleanup_strv_free_
char **altnames
= NULL
;
2470 r
= sd_netlink_message_read_strv(message
, IFLA_PROP_LIST
, IFLA_ALT_IFNAME
, &altnames
);
2472 /* The message does not have IFLA_PROP_LIST container attribute. It does not mean the
2473 * interface has no alternative name. */
2476 return log_link_debug_errno(link
, r
, "rtnl: failed to read alternative names: %m");
2478 if (strv_equal(altnames
, link
->alternative_names
))
2481 STRV_FOREACH(n
, link
->alternative_names
)
2482 hashmap_remove(link
->manager
->links_by_name
, *n
);
2484 strv_free_and_replace(link
->alternative_names
, altnames
);
2486 STRV_FOREACH(n
, link
->alternative_names
) {
2487 r
= hashmap_ensure_put(&link
->manager
->links_by_name
, &string_hash_ops
, *n
, link
);
2489 return log_link_debug_errno(link
, r
, "Failed to manage link by its new alternative names: %m");
2492 return 1; /* needs reconfigure */
2495 static int link_update_name(Link
*link
, sd_netlink_message
*message
) {
2496 char ifname_from_index
[IF_NAMESIZE
];
2503 r
= sd_netlink_message_read_string(message
, IFLA_IFNAME
, &ifname
);
2508 return log_link_debug_errno(link
, r
, "Failed to read interface name in RTM_NEWLINK message: %m");
2510 if (streq(ifname
, link
->ifname
))
2513 r
= format_ifname(link
->ifindex
, ifname_from_index
);
2515 return log_link_debug_errno(link
, r
, "Could not get interface name for index %i.", link
->ifindex
);
2517 if (!streq(ifname
, ifname_from_index
)) {
2518 log_link_debug(link
, "New interface name '%s' received from the kernel does not correspond "
2519 "with the name currently configured on the actual interface '%s'. Ignoring.",
2520 ifname
, ifname_from_index
);
2524 log_link_info(link
, "Interface name change detected, renamed to %s.", ifname
);
2526 hashmap_remove(link
->manager
->links_by_name
, link
->ifname
);
2528 r
= free_and_strdup(&link
->ifname
, ifname
);
2530 return log_oom_debug();
2532 r
= hashmap_ensure_put(&link
->manager
->links_by_name
, &string_hash_ops
, link
->ifname
, link
);
2534 return log_link_debug_errno(link
, r
, "Failed to manage link by its new name: %m");
2536 if (link
->dhcp_client
) {
2537 r
= sd_dhcp_client_set_ifname(link
->dhcp_client
, link
->ifname
);
2539 return log_link_debug_errno(link
, r
, "Failed to update interface name in DHCP client: %m");
2542 if (link
->dhcp6_client
) {
2543 r
= sd_dhcp6_client_set_ifname(link
->dhcp6_client
, link
->ifname
);
2545 return log_link_debug_errno(link
, r
, "Failed to update interface name in DHCP6 client: %m");
2549 r
= sd_ndisc_set_ifname(link
->ndisc
, link
->ifname
);
2551 return log_link_debug_errno(link
, r
, "Failed to update interface name in NDisc: %m");
2554 if (link
->dhcp_server
) {
2555 r
= sd_dhcp_server_set_ifname(link
->dhcp_server
, link
->ifname
);
2557 return log_link_debug_errno(link
, r
, "Failed to update interface name in DHCP server: %m");
2561 r
= sd_radv_set_ifname(link
->radv
, link
->ifname
);
2563 return log_link_debug_errno(link
, r
, "Failed to update interface name in Router Advertisement: %m");
2566 if (link
->lldp_rx
) {
2567 r
= sd_lldp_rx_set_ifname(link
->lldp_rx
, link
->ifname
);
2569 return log_link_debug_errno(link
, r
, "Failed to update interface name in LLDP Rx: %m");
2572 if (link
->lldp_tx
) {
2573 r
= sd_lldp_tx_set_ifname(link
->lldp_tx
, link
->ifname
);
2575 return log_link_debug_errno(link
, r
, "Failed to update interface name in LLDP Tx: %m");
2579 r
= sd_ipv4ll_set_ifname(link
->ipv4ll
, link
->ifname
);
2581 return log_link_debug_errno(link
, r
, "Failed to update interface name in IPv4LL client: %m");
2584 r
= ipv4acd_set_ifname(link
);
2586 return log_link_debug_errno(link
, r
, "Failed to update interface name in IPv4ACD client: %m");
2588 return 1; /* needs reconfigure */
2591 static int link_update(Link
*link
, sd_netlink_message
*message
) {
2592 bool needs_reconfigure
= false;
2598 r
= link_update_name(link
, message
);
2601 needs_reconfigure
= needs_reconfigure
|| r
> 0;
2603 r
= link_update_alternative_names(link
, message
);
2606 needs_reconfigure
= needs_reconfigure
|| r
> 0;
2608 r
= link_update_mtu(link
, message
);
2612 r
= link_update_driver(link
, message
);
2615 needs_reconfigure
= needs_reconfigure
|| r
> 0;
2617 r
= link_update_permanent_hardware_address(link
, message
);
2620 needs_reconfigure
= needs_reconfigure
|| r
> 0;
2622 r
= link_update_hardware_address(link
, message
);
2625 needs_reconfigure
= needs_reconfigure
|| r
> 0;
2627 r
= link_update_master(link
, message
);
2631 r
= link_update_ipv6ll_addrgen_mode(link
, message
);
2635 r
= link_update_flags(link
, message
);
2639 r
= link_update_bridge_vlan(link
, message
);
2643 return needs_reconfigure
;
2646 static Link
*link_drop_or_unref(Link
*link
) {
2650 return link_unref(link
);
2651 return link_drop(link
);
2654 DEFINE_TRIVIAL_CLEANUP_FUNC(Link
*, link_drop_or_unref
);
2656 static int link_new(Manager
*manager
, sd_netlink_message
*message
, Link
**ret
) {
2657 _cleanup_free_
char *ifname
= NULL
, *kind
= NULL
, *state_file
= NULL
, *lease_file
= NULL
, *lldp_file
= NULL
;
2658 _cleanup_(link_drop_or_unrefp
) Link
*link
= NULL
;
2659 unsigned short iftype
;
2666 r
= sd_rtnl_message_link_get_ifindex(message
, &ifindex
);
2668 return log_debug_errno(r
, "rtnl: failed to read ifindex from link message: %m");
2669 else if (ifindex
<= 0)
2670 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL
), "rtnl: received link message without valid ifindex.");
2672 r
= sd_rtnl_message_link_get_type(message
, &iftype
);
2674 return log_debug_errno(r
, "rtnl: failed to read interface type from link message: %m");
2676 r
= sd_netlink_message_read_string_strdup(message
, IFLA_IFNAME
, &ifname
);
2678 return log_debug_errno(r
, "rtnl: failed to read interface name from link message: %m");
2680 /* check for link kind */
2681 r
= sd_netlink_message_enter_container(message
, IFLA_LINKINFO
);
2683 r
= sd_netlink_message_read_string_strdup(message
, IFLA_INFO_KIND
, &kind
);
2684 if (r
< 0 && r
!= -ENODATA
)
2685 return log_debug_errno(r
, "rtnl: failed to read interface kind from link message: %m");
2686 r
= sd_netlink_message_exit_container(message
);
2688 return log_debug_errno(r
, "rtnl: failed to exit IFLA_LINKINFO container: %m");
2691 if (!manager
->test_mode
) {
2692 /* Do not update state files when running in test mode. */
2693 if (asprintf(&state_file
, "/run/systemd/netif/links/%d", ifindex
) < 0)
2694 return log_oom_debug();
2696 if (asprintf(&lease_file
, "/run/systemd/netif/leases/%d", ifindex
) < 0)
2697 return log_oom_debug();
2699 if (asprintf(&lldp_file
, "/run/systemd/netif/lldp/%d", ifindex
) < 0)
2700 return log_oom_debug();
2703 link
= new(Link
, 1);
2709 .state
= LINK_STATE_PENDING
,
2710 .online_state
= _LINK_ONLINE_STATE_INVALID
,
2711 .automatic_reconfigure_ratelimit
= (const RateLimit
) { .interval
= 10 * USEC_PER_SEC
, .burst
= 5 },
2714 .ifname
= TAKE_PTR(ifname
),
2715 .kind
= TAKE_PTR(kind
),
2717 .bridge_vlan_pvid
= UINT16_MAX
,
2719 .ipv6ll_address_gen_mode
= _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_INVALID
,
2721 .state_file
= TAKE_PTR(state_file
),
2722 .lease_file
= TAKE_PTR(lease_file
),
2723 .lldp_file
= TAKE_PTR(lldp_file
),
2726 .dns_default_route
= -1,
2727 .llmnr
= _RESOLVE_SUPPORT_INVALID
,
2728 .mdns
= _RESOLVE_SUPPORT_INVALID
,
2729 .dnssec_mode
= _DNSSEC_MODE_INVALID
,
2730 .dns_over_tls_mode
= _DNS_OVER_TLS_MODE_INVALID
,
2733 r
= hashmap_ensure_put(&manager
->links_by_index
, NULL
, INT_TO_PTR(link
->ifindex
), link
);
2735 return log_link_debug_errno(link
, r
, "Failed to store link into manager: %m");
2737 link
->manager
= manager
;
2739 r
= hashmap_ensure_put(&manager
->links_by_name
, &string_hash_ops
, link
->ifname
, link
);
2741 return log_link_debug_errno(link
, r
, "Failed to manage link by its interface name: %m");
2743 log_link_debug(link
, "Saved new link: ifindex=%i, iftype=%s(%u), kind=%s",
2744 link
->ifindex
, strna(arphrd_to_name(link
->iftype
)), link
->iftype
, strna(link
->kind
));
2746 /* If contained in this set, the link is wireless and the corresponding NL80211_CMD_NEW_INTERFACE
2747 * message arrived too early. Request the wireless link information again.
2749 if (set_remove(manager
->new_wlan_ifindices
, INT_TO_PTR(link
->ifindex
))) {
2750 r
= link_get_wlan_interface(link
);
2752 log_link_warning_errno(link
, r
, "Failed to get wireless interface, ignoring: %m");
2755 *ret
= TAKE_PTR(link
);
2759 int manager_rtnl_process_link(sd_netlink
*rtnl
, sd_netlink_message
*message
, Manager
*manager
) {
2761 NetDev
*netdev
= NULL
;
2770 if (sd_netlink_message_is_error(message
)) {
2771 r
= sd_netlink_message_get_errno(message
);
2773 log_message_warning_errno(message
, r
, "rtnl: Could not receive link message, ignoring");
2778 r
= sd_netlink_message_get_type(message
, &type
);
2780 log_warning_errno(r
, "rtnl: Could not get message type, ignoring: %m");
2782 } else if (!IN_SET(type
, RTM_NEWLINK
, RTM_DELLINK
)) {
2783 log_warning("rtnl: Received unexpected message type %u when processing link, ignoring.", type
);
2787 r
= sd_rtnl_message_link_get_ifindex(message
, &ifindex
);
2789 log_warning_errno(r
, "rtnl: Could not get ifindex from link message, ignoring: %m");
2791 } else if (ifindex
<= 0) {
2792 log_warning("rtnl: received link message with invalid ifindex %d, ignoring.", ifindex
);
2796 r
= sd_netlink_message_read_string(message
, IFLA_IFNAME
, &name
);
2798 log_warning_errno(r
, "rtnl: Received link message without ifname, ignoring: %m");
2802 (void) link_get_by_index(manager
, ifindex
, &link
);
2803 (void) netdev_get(manager
, name
, &netdev
);
2808 /* netdev exists, so make sure the ifindex matches */
2809 r
= netdev_set_ifindex(netdev
, message
);
2811 log_netdev_warning_errno(netdev
, r
, "Could not process new link message for netdev, ignoring: %m");
2817 /* link is new, so add it */
2818 r
= link_new(manager
, message
, &link
);
2820 log_warning_errno(r
, "Could not process new link message: %m");
2824 r
= link_update(link
, message
);
2826 log_link_warning_errno(link
, r
, "Could not process link message: %m");
2827 link_enter_failed(link
);
2831 r
= link_check_initialized(link
);
2833 log_link_warning_errno(link
, r
, "Failed to check link is initialized: %m");
2834 link_enter_failed(link
);
2838 r
= link_update(link
, message
);
2840 log_link_warning_errno(link
, r
, "Could not process link message: %m");
2841 link_enter_failed(link
);
2845 r
= link_reconfigure_impl(link
, /* force = */ false);
2847 log_link_warning_errno(link
, r
, "Failed to reconfigure interface: %m");
2848 link_enter_failed(link
);
2857 netdev_drop(netdev
);
2861 assert_not_reached();
2867 int link_getlink_handler_internal(sd_netlink
*rtnl
, sd_netlink_message
*m
, Link
*link
, const char *error_msg
) {
2868 uint16_t message_type
;
2875 if (IN_SET(link
->state
, LINK_STATE_FAILED
, LINK_STATE_LINGER
))
2878 r
= sd_netlink_message_get_errno(m
);
2880 log_link_message_warning_errno(link
, m
, r
, error_msg
);
2881 link_enter_failed(link
);
2885 r
= sd_netlink_message_get_type(m
, &message_type
);
2887 log_link_debug_errno(link
, r
, "rtnl: failed to read link message type, ignoring: %m");
2890 if (message_type
!= RTM_NEWLINK
) {
2891 log_link_debug(link
, "rtnl: received invalid link message type, ignoring.");
2895 r
= link_update(link
, m
);
2897 link_enter_failed(link
);
2904 int link_call_getlink(Link
*link
, link_netlink_message_handler_t callback
) {
2905 _cleanup_(sd_netlink_message_unrefp
) sd_netlink_message
*req
= NULL
;
2909 assert(link
->manager
);
2910 assert(link
->manager
->rtnl
);
2913 r
= sd_rtnl_message_new_link(link
->manager
->rtnl
, &req
, RTM_GETLINK
, link
->ifindex
);
2917 r
= netlink_call_async(link
->manager
->rtnl
, NULL
, req
, callback
,
2918 link_netlink_destroy_callback
, link
);
2926 static const char* const link_state_table
[_LINK_STATE_MAX
] = {
2927 [LINK_STATE_PENDING
] = "pending",
2928 [LINK_STATE_INITIALIZED
] = "initialized",
2929 [LINK_STATE_CONFIGURING
] = "configuring",
2930 [LINK_STATE_CONFIGURED
] = "configured",
2931 [LINK_STATE_UNMANAGED
] = "unmanaged",
2932 [LINK_STATE_FAILED
] = "failed",
2933 [LINK_STATE_LINGER
] = "linger",
2936 DEFINE_STRING_TABLE_LOOKUP(link_state
, LinkState
);
2938 int link_flags_to_string_alloc(uint32_t flags
, char **ret
) {
2939 _cleanup_free_
char *str
= NULL
;
2940 static const char* map
[] = {
2941 [LOG2U(IFF_UP
)] = "up", /* interface is up. */
2942 [LOG2U(IFF_BROADCAST
)] = "broadcast", /* broadcast address valid. */
2943 [LOG2U(IFF_DEBUG
)] = "debug", /* turn on debugging. */
2944 [LOG2U(IFF_LOOPBACK
)] = "loopback", /* interface is a loopback net. */
2945 [LOG2U(IFF_POINTOPOINT
)] = "point-to-point", /* interface has p-p link. */
2946 [LOG2U(IFF_NOTRAILERS
)] = "no-trailers", /* avoid use of trailers. */
2947 [LOG2U(IFF_RUNNING
)] = "running", /* interface RFC2863 OPER_UP. */
2948 [LOG2U(IFF_NOARP
)] = "no-arp", /* no ARP protocol. */
2949 [LOG2U(IFF_PROMISC
)] = "promiscuous", /* receive all packets. */
2950 [LOG2U(IFF_ALLMULTI
)] = "all-multicast", /* receive all multicast packets. */
2951 [LOG2U(IFF_MASTER
)] = "master", /* master of a load balancer. */
2952 [LOG2U(IFF_SLAVE
)] = "slave", /* slave of a load balancer. */
2953 [LOG2U(IFF_MULTICAST
)] = "multicast", /* supports multicast. */
2954 [LOG2U(IFF_PORTSEL
)] = "portsel", /* can set media type. */
2955 [LOG2U(IFF_AUTOMEDIA
)] = "auto-media", /* auto media select active. */
2956 [LOG2U(IFF_DYNAMIC
)] = "dynamic", /* dialup device with changing addresses. */
2957 [LOG2U(IFF_LOWER_UP
)] = "lower-up", /* driver signals L1 up. */
2958 [LOG2U(IFF_DORMANT
)] = "dormant", /* driver signals dormant. */
2959 [LOG2U(IFF_ECHO
)] = "echo", /* echo sent packets. */
2964 for (size_t i
= 0; i
< ELEMENTSOF(map
); i
++)
2965 if (FLAGS_SET(flags
, 1 << i
) && map
[i
])
2966 if (!strextend_with_separator(&str
, ",", map
[i
]))
2969 *ret
= TAKE_PTR(str
);
2973 static const char * const kernel_operstate_table
[] = {
2974 [IF_OPER_UNKNOWN
] = "unknown",
2975 [IF_OPER_NOTPRESENT
] = "not-present",
2976 [IF_OPER_DOWN
] = "down",
2977 [IF_OPER_LOWERLAYERDOWN
] = "lower-layer-down",
2978 [IF_OPER_TESTING
] = "testing",
2979 [IF_OPER_DORMANT
] = "dormant",
2980 [IF_OPER_UP
] = "up",
2983 DEFINE_STRING_TABLE_LOOKUP_TO_STRING(kernel_operstate
, int);