/* SPDX-License-Identifier: LGPL-2.1-or-later */ /* Make sure the net/if.h header is included before any linux/ one */ #include #include #include #include #include #include #include #include #include "alloc-util.h" #include "arphrd-util.h" #include "batadv.h" #include "bond.h" #include "bridge.h" #include "bus-util.h" #include "device-private.h" #include "device-util.h" #include "dhcp-lease-internal.h" #include "env-file.h" #include "ethtool-util.h" #include "event-util.h" #include "fd-util.h" #include "fileio.h" #include "format-ifname.h" #include "fs-util.h" #include "glyph-util.h" #include "logarithm.h" #include "missing_network.h" #include "netlink-util.h" #include "network-internal.h" #include "networkd-address-label.h" #include "networkd-address.h" #include "networkd-bridge-fdb.h" #include "networkd-bridge-mdb.h" #include "networkd-bridge-vlan.h" #include "networkd-can.h" #include "networkd-dhcp-prefix-delegation.h" #include "networkd-dhcp-server.h" #include "networkd-dhcp4.h" #include "networkd-dhcp6.h" #include "networkd-ipv4acd.h" #include "networkd-ipv4ll.h" #include "networkd-ipv6-proxy-ndp.h" #include "networkd-link-bus.h" #include "networkd-link.h" #include "networkd-lldp-tx.h" #include "networkd-manager.h" #include "networkd-ndisc.h" #include "networkd-neighbor.h" #include "networkd-nexthop.h" #include "networkd-queue.h" #include "networkd-radv.h" #include "networkd-route-util.h" #include "networkd-route.h" #include "networkd-routing-policy-rule.h" #include "networkd-setlink.h" #include "networkd-sriov.h" #include "networkd-state-file.h" #include "networkd-sysctl.h" #include "networkd-wifi.h" #include "set.h" #include "socket-util.h" #include "stdio-util.h" #include "string-table.h" #include "strv.h" #include "tc.h" #include "tmpfile-util.h" #include "tuntap.h" #include "udev-util.h" #include "vrf.h" void link_required_operstate_for_online(Link *link, LinkOperationalStateRange *ret) { assert(link); assert(ret); if (link->network && operational_state_range_is_valid(&link->network->required_operstate_for_online)) /* If explicitly specified, use it as is. */ *ret = link->network->required_operstate_for_online; else if (link->iftype == ARPHRD_CAN) /* CAN devices do not support addressing, hence defaults to 'carrier'. */ *ret = (const LinkOperationalStateRange) { .min = LINK_OPERSTATE_CARRIER, .max = LINK_OPERSTATE_CARRIER, }; else if (link->network && link->network->bond) /* Bonding slaves do not support addressing. */ *ret = (const LinkOperationalStateRange) { .min = LINK_OPERSTATE_ENSLAVED, .max = LINK_OPERSTATE_ENSLAVED, }; else if (STRPTR_IN_SET(link->kind, "batadv", "bond", "bridge", "vrf")) /* Some of slave interfaces may be offline. */ *ret = (const LinkOperationalStateRange) { .min = LINK_OPERSTATE_DEGRADED_CARRIER, .max = LINK_OPERSTATE_ROUTABLE, }; else *ret = LINK_OPERSTATE_RANGE_DEFAULT; } AddressFamily link_required_family_for_online(Link *link) { assert(link); if (link->network && link->network->required_family_for_online >= 0) return link->network->required_family_for_online; if (link->network && operational_state_range_is_valid(&link->network->required_operstate_for_online)) /* If RequiredForOnline= is explicitly specified, defaults to no. */ return ADDRESS_FAMILY_NO; if (STRPTR_IN_SET(link->kind, "batadv", "bond", "bridge", "vrf")) /* As the minimum required operstate for master interfaces is 'degraded-carrier', * we should request an address assigned to the link for backward compatibility. */ return ADDRESS_FAMILY_YES; return ADDRESS_FAMILY_NO; } bool link_ipv6_enabled(Link *link) { assert(link); if (!socket_ipv6_is_supported()) return false; if (link->iftype == ARPHRD_CAN) return false; if (!link->network) return false; if (link->network->bond) return false; if (link_may_have_ipv6ll(link, /* check_multicast = */ false)) return true; if (network_has_static_ipv6_configurations(link->network)) return true; return false; } bool link_has_ipv6_connectivity(Link *link) { LinkAddressState ipv6_address_state; assert(link); link_get_address_states(link, NULL, &ipv6_address_state, NULL); switch (ipv6_address_state) { case LINK_ADDRESS_STATE_ROUTABLE: /* If the interface has a routable IPv6 address, then we assume yes. */ return true; case LINK_ADDRESS_STATE_DEGRADED: /* If the interface has only degraded IPv6 address (mostly, link-local address), then let's check * there is an IPv6 default gateway. */ return link_has_default_gateway(link, AF_INET6); case LINK_ADDRESS_STATE_OFF: /* No IPv6 address. */ return false; default: assert_not_reached(); } } static bool link_is_ready_to_configure_one(Link *link, bool allow_unmanaged) { assert(link); if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED, LINK_STATE_UNMANAGED)) return false; if (!link->network) return allow_unmanaged; if (!link->network->configure_without_carrier) { if (link->set_flags_messages > 0) return false; if (!link_has_carrier(link)) return false; } if (link->set_link_messages > 0) return false; if (!link->activated) return false; return true; } bool link_is_ready_to_configure(Link *link, bool allow_unmanaged) { return check_ready_for_all_sr_iov_ports(link, allow_unmanaged, link_is_ready_to_configure_one); } void link_ntp_settings_clear(Link *link) { link->ntp = strv_free(link->ntp); } void link_dns_settings_clear(Link *link) { if (link->n_dns != UINT_MAX) for (unsigned i = 0; i < link->n_dns; i++) in_addr_full_free(link->dns[i]); link->dns = mfree(link->dns); link->n_dns = UINT_MAX; link->search_domains = ordered_set_free(link->search_domains); link->route_domains = ordered_set_free(link->route_domains); link->dns_default_route = -1; link->llmnr = _RESOLVE_SUPPORT_INVALID; link->mdns = _RESOLVE_SUPPORT_INVALID; link->dnssec_mode = _DNSSEC_MODE_INVALID; link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID; link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors); } static void link_free_engines(Link *link) { if (!link) return; link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server); link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client); link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease); link->dhcp4_6rd_tunnel_name = mfree(link->dhcp4_6rd_tunnel_name); link->lldp_rx = sd_lldp_rx_unref(link->lldp_rx); link->lldp_tx = sd_lldp_tx_unref(link->lldp_tx); link->ipv4acd_by_address = hashmap_free(link->ipv4acd_by_address); link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll); link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client); link->dhcp6_lease = sd_dhcp6_lease_unref(link->dhcp6_lease); link->ndisc = sd_ndisc_unref(link->ndisc); link->ndisc_expire = sd_event_source_disable_unref(link->ndisc_expire); ndisc_flush(link); link->radv = sd_radv_unref(link->radv); } static Link *link_free(Link *link) { assert(link); (void) sysctl_clear_link_shadows(link); link_ntp_settings_clear(link); link_dns_settings_clear(link); link->neighbors = set_free(link->neighbors); link->addresses = set_free(link->addresses); link->qdiscs = set_free(link->qdiscs); link->tclasses = set_free(link->tclasses); link->dhcp_pd_prefixes = set_free(link->dhcp_pd_prefixes); link_free_engines(link); set_free(link->sr_iov_virt_port_ifindices); free(link->ifname); strv_free(link->alternative_names); free(link->kind); free(link->ssid); free(link->previous_ssid); free(link->driver); unlink_and_free(link->lease_file); unlink_and_free(link->state_file); sd_device_unref(link->dev); netdev_unref(link->netdev); hashmap_free(link->bound_to_links); hashmap_free(link->bound_by_links); set_free_with_destructor(link->slaves, link_unref); network_unref(link->network); sd_event_source_disable_unref(link->carrier_lost_timer); sd_event_source_disable_unref(link->ipv6_mtu_wait_synced_event_source); return mfree(link); } DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free); int link_get_by_index(Manager *m, int ifindex, Link **ret) { Link *link; assert(m); if (ifindex <= 0) return -EINVAL; link = hashmap_get(m->links_by_index, INT_TO_PTR(ifindex)); if (!link) return -ENODEV; if (ret) *ret = link; return 0; } int link_get_by_name(Manager *m, const char *ifname, Link **ret) { Link *link; assert(m); assert(ifname); link = hashmap_get(m->links_by_name, ifname); if (!link) return -ENODEV; if (ret) *ret = link; return 0; } int link_get_by_hw_addr(Manager *m, const struct hw_addr_data *hw_addr, Link **ret) { Link *link; assert(m); assert(hw_addr); link = hashmap_get(m->links_by_hw_addr, hw_addr); if (!link) return -ENODEV; if (ret) *ret = link; return 0; } int link_get_master(Link *link, Link **ret) { assert(link); assert(link->manager); assert(ret); if (link->master_ifindex <= 0 || link->master_ifindex == link->ifindex) return -ENODEV; return link_get_by_index(link->manager, link->master_ifindex, ret); } void link_set_state(Link *link, LinkState state) { assert(link); if (link->state == state) return; log_link_debug(link, "State changed: %s -> %s", link_state_to_string(link->state), link_state_to_string(state)); link->state = state; link_send_changed(link, "AdministrativeState", NULL); link_dirty(link); } int link_stop_engines(Link *link, bool may_keep_dynamic) { int r, ret = 0; assert(link); assert(link->manager); assert(link->manager->event); bool keep_dynamic = may_keep_dynamic && link->network && (link->manager->state == MANAGER_RESTARTING || FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DYNAMIC_ON_STOP)); if (!keep_dynamic) { r = sd_dhcp_client_stop(link->dhcp_client); if (r < 0) RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv4 client: %m")); r = sd_ipv4ll_stop(link->ipv4ll); if (r < 0) RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv4 link-local: %m")); r = sd_dhcp6_client_stop(link->dhcp6_client); if (r < 0) RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv6 client: %m")); r = dhcp_pd_remove(link, /* only_marked = */ false); if (r < 0) RET_GATHER(ret, log_link_warning_errno(link, r, "Could not remove DHCPv6 PD addresses and routes: %m")); r = ndisc_stop(link); if (r < 0) RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv6 Router Discovery: %m")); ndisc_flush(link); } r = sd_dhcp_server_stop(link->dhcp_server); if (r < 0) RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv4 server: %m")); r = sd_lldp_rx_stop(link->lldp_rx); if (r < 0) RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop LLDP Rx: %m")); r = sd_lldp_tx_stop(link->lldp_tx); if (r < 0) RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop LLDP Tx: %m")); r = ipv4acd_stop(link); if (r < 0) RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv4 ACD client: %m")); r = sd_radv_stop(link->radv); if (r < 0) RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv6 Router Advertisement: %m")); return ret; } void link_enter_failed(Link *link) { assert(link); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return; log_link_warning(link, "Failed"); link_set_state(link, LINK_STATE_FAILED); if (!ratelimit_below(&link->automatic_reconfigure_ratelimit)) { log_link_warning(link, "The interface entered the failed state frequently, refusing to reconfigure it automatically."); goto stop; } log_link_info(link, "Trying to reconfigure the interface."); if (link_reconfigure(link, LINK_RECONFIGURE_UNCONDITIONALLY) > 0) return; stop: (void) link_stop_engines(link, /* may_keep_dynamic = */ false); } void link_check_ready(Link *link) { Address *a; assert(link); if (link->state == LINK_STATE_CONFIGURED) return; if (link->state != LINK_STATE_CONFIGURING) return (void) log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state)); if (!link->network) return (void) log_link_debug(link, "%s(): link is unmanaged.", __func__); if (!link->tc_configured) return (void) log_link_debug(link, "%s(): traffic controls are not configured.", __func__); if (link->set_link_messages > 0) return (void) log_link_debug(link, "%s(): link layer is configuring.", __func__); if (!link->activated) return (void) log_link_debug(link, "%s(): link is not activated.", __func__); if (link->iftype == ARPHRD_CAN) /* let's shortcut things for CAN which doesn't need most of checks below. */ goto ready; if (!link->stacked_netdevs_created) return (void) log_link_debug(link, "%s(): stacked netdevs are not created.", __func__); if (!link->static_addresses_configured) return (void) log_link_debug(link, "%s(): static addresses are not configured.", __func__); if (!link->static_address_labels_configured) return (void) log_link_debug(link, "%s(): static address labels are not configured.", __func__); if (!link->static_bridge_fdb_configured) return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__); if (!link->static_bridge_mdb_configured) return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__); if (!link->static_ipv6_proxy_ndp_configured) return (void) log_link_debug(link, "%s(): static IPv6 proxy NDP addresses are not configured.", __func__); if (!link->static_neighbors_configured) return (void) log_link_debug(link, "%s(): static neighbors are not configured.", __func__); if (!link->static_nexthops_configured) return (void) log_link_debug(link, "%s(): static nexthops are not configured.", __func__); if (!link->static_routes_configured) return (void) log_link_debug(link, "%s(): static routes are not configured.", __func__); if (!link->static_routing_policy_rules_configured) return (void) log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__); if (!link->sr_iov_configured) return (void) log_link_debug(link, "%s(): SR-IOV is not configured.", __func__); /* IPv6LL is assigned after the link gains its carrier. */ if (!link->network->configure_without_carrier && link_ipv6ll_enabled(link) && !in6_addr_is_set(&link->ipv6ll_address)) return (void) log_link_debug(link, "%s(): IPv6LL is not configured yet.", __func__); /* All static addresses must be ready. */ bool has_static_address = false; SET_FOREACH(a, link->addresses) { if (a->source != NETWORK_CONFIG_SOURCE_STATIC) continue; if (!address_is_ready(a)) return (void) log_link_debug(link, "%s(): static address %s is not ready.", __func__, IN_ADDR_PREFIX_TO_STRING(a->family, &a->in_addr, a->prefixlen)); has_static_address = true; } /* If at least one static address is requested, do not request that dynamic addressing protocols are finished. */ if (has_static_address) goto ready; /* If no dynamic addressing protocol enabled, assume the interface is ready. * Note, ignore NDisc when ConfigureWithoutCarrier= is enabled, as IPv6AcceptRA= is enabled by default. */ if (!link_ipv4ll_enabled(link) && !link_dhcp4_enabled(link) && !link_dhcp6_enabled(link) && !link_dhcp_pd_is_enabled(link) && (link->network->configure_without_carrier || !link_ndisc_enabled(link))) goto ready; bool ipv4ll_ready = link_ipv4ll_enabled(link) && link->ipv4ll_address_configured && link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_IPV4LL); bool dhcp4_ready = link_dhcp4_enabled(link) && link->dhcp4_configured && link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP4); bool dhcp6_ready = link_dhcp6_enabled(link) && link->dhcp6_configured && (!link->network->dhcp6_use_address || link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP6)); bool dhcp_pd_ready = link_dhcp_pd_is_enabled(link) && link->dhcp_pd_configured && (!link->network->dhcp_pd_assign || link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP_PD)); bool ndisc_ready = link_ndisc_enabled(link) && link->ndisc_configured && (!link->network->ndisc_use_autonomous_prefix || link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_NDISC)); /* If the uplink for PD is self, then request the corresponding DHCP protocol is also ready. */ if (dhcp_pd_is_uplink(link, link, /* accept_auto = */ false)) { if (link_dhcp4_enabled(link) && link->network->dhcp_use_6rd && sd_dhcp_lease_has_6rd(link->dhcp_lease)) { if (!link->dhcp4_configured) return (void) log_link_debug(link, "%s(): DHCPv4 6rd prefix is assigned, but DHCPv4 protocol is not finished yet.", __func__); if (!dhcp_pd_ready) return (void) log_link_debug(link, "%s(): DHCPv4 is finished, but prefix acquired by DHCPv4-6rd is not assigned yet.", __func__); } if (link_dhcp6_enabled(link) && link->network->dhcp6_use_pd_prefix && sd_dhcp6_lease_has_pd_prefix(link->dhcp6_lease)) { if (!link->dhcp6_configured) return (void) log_link_debug(link, "%s(): DHCPv6 IA_PD prefix is assigned, but DHCPv6 protocol is not finished yet.", __func__); if (!dhcp_pd_ready) return (void) log_link_debug(link, "%s(): DHCPv6 is finished, but prefix acquired by DHCPv6 IA_PD is not assigned yet.", __func__); } } /* At least one dynamic addressing protocol is finished. */ if (!ipv4ll_ready && !dhcp4_ready && !dhcp6_ready && !dhcp_pd_ready && !ndisc_ready) return (void) log_link_debug(link, "%s(): dynamic addressing protocols are enabled but none of them finished yet.", __func__); log_link_debug(link, "%s(): IPv4LL:%s DHCPv4:%s DHCPv6:%s DHCP-PD:%s NDisc:%s", __func__, yes_no(ipv4ll_ready), yes_no(dhcp4_ready), yes_no(dhcp6_ready), yes_no(dhcp_pd_ready), yes_no(ndisc_ready)); ready: link_set_state(link, LINK_STATE_CONFIGURED); } static int link_request_static_configs(Link *link) { int r; assert(link); assert(link->network); assert(link->state != _LINK_STATE_INVALID); r = link_request_static_addresses(link); if (r < 0) return r; r = link_request_static_address_labels(link); if (r < 0) return r; r = link_request_static_bridge_fdb(link); if (r < 0) return r; r = link_request_static_bridge_mdb(link); if (r < 0) return r; r = link_request_static_ipv6_proxy_ndp_addresses(link); if (r < 0) return r; r = link_request_static_neighbors(link); if (r < 0) return r; r = link_request_static_nexthops(link, false); if (r < 0) return r; r = link_request_static_routes(link, false); if (r < 0) return r; r = link_request_static_routing_policy_rules(link); if (r < 0) return r; return 0; } int link_request_stacked_netdevs(Link *link, NetDevLocalAddressType type) { NetDev *netdev; int r; assert(link); if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) return 0; assert(link->network); link->stacked_netdevs_created = false; HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) { if (!netdev_needs_reconfigure(netdev, type)) continue; r = link_request_stacked_netdev(link, netdev); if (r < 0) return r; } if (link->create_stacked_netdev_messages == 0) { link->stacked_netdevs_created = true; link_check_ready(link); } return 0; } static int link_acquire_dynamic_ipv6_conf(Link *link) { int r; assert(link); r = radv_start(link); if (r < 0) return log_link_warning_errno(link, r, "Failed to start IPv6 Router Advertisement engine: %m"); r = ndisc_start(link); if (r < 0) return log_link_warning_errno(link, r, "Failed to start IPv6 Router Discovery: %m"); r = dhcp6_start(link); if (r < 0) return log_link_warning_errno(link, r, "Failed to start DHCPv6 client: %m"); return 0; } static int link_acquire_dynamic_ipv4_conf(Link *link) { int r; assert(link); assert(link->manager); assert(link->manager->event); if (link->dhcp_client) { r = dhcp4_start(link); if (r < 0) return log_link_warning_errno(link, r, "Failed to start DHCPv4 client: %m"); log_link_debug(link, "Acquiring DHCPv4 lease."); } else if (link->ipv4ll) { if (in4_addr_is_set(&link->network->ipv4ll_start_address)) { r = sd_ipv4ll_set_address(link->ipv4ll, &link->network->ipv4ll_start_address); if (r < 0) return log_link_warning_errno(link, r, "Could not set IPv4 link-local start address: %m"); } r = sd_ipv4ll_start(link->ipv4ll); if (r < 0) return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m"); log_link_debug(link, "Acquiring IPv4 link-local address."); } r = link_start_dhcp4_server(link); if (r < 0) return log_link_warning_errno(link, r, "Could not start DHCP server: %m"); r = ipv4acd_start(link); if (r < 0) return log_link_warning_errno(link, r, "Could not start IPv4 ACD client: %m"); return 0; } static int link_acquire_dynamic_conf(Link *link) { int r; assert(link); assert(link->network); r = link_acquire_dynamic_ipv4_conf(link); if (r < 0) return r; if (in6_addr_is_set(&link->ipv6ll_address)) { r = link_acquire_dynamic_ipv6_conf(link); if (r < 0) return r; } if (!link_radv_enabled(link) || !link->network->dhcp_pd_announce) { /* DHCPv6PD downstream does not require IPv6LL address. But may require RADV to be * configured, and RADV may not be configured yet here. Only acquire subnet prefix when * RADV is disabled, or the announcement of the prefix is disabled. Otherwise, the * below will be called in radv_start(). */ r = dhcp_request_prefix_delegation(link); if (r < 0) return log_link_warning_errno(link, r, "Failed to request DHCP delegated subnet prefix: %m"); } if (link->lldp_tx) { r = sd_lldp_tx_start(link->lldp_tx); if (r < 0) return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m"); } if (link->lldp_rx) { r = sd_lldp_rx_start(link->lldp_rx); if (r < 0) return log_link_warning_errno(link, r, "Failed to start LLDP client: %m"); } return 0; } int link_ipv6ll_gained(Link *link) { int r; assert(link); log_link_info(link, "Gained IPv6LL"); if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) return 0; r = link_acquire_dynamic_ipv6_conf(link); if (r < 0) return r; r = link_request_stacked_netdevs(link, NETDEV_LOCAL_ADDRESS_IPV6LL); if (r < 0) return r; link_check_ready(link); return 0; } int link_handle_bound_to_list(Link *link) { bool required_up = false; bool link_is_up = false; Link *l; assert(link); /* If at least one interface in bound_to_links has carrier, then make this interface up. * If all interfaces in bound_to_links do not, then make this interface down. */ if (hashmap_isempty(link->bound_to_links)) return 0; if (link->flags & IFF_UP) link_is_up = true; HASHMAP_FOREACH(l, link->bound_to_links) if (link_has_carrier(l)) { required_up = true; break; } if (!required_up && link_is_up) return link_request_to_bring_up_or_down(link, /* up = */ false); if (required_up && !link_is_up) return link_request_to_bring_up_or_down(link, /* up = */ true); return 0; } static int link_handle_bound_by_list(Link *link) { Link *l; int r; assert(link); /* Update up or down state of interfaces which depend on this interface's carrier state. */ HASHMAP_FOREACH(l, link->bound_by_links) { r = link_handle_bound_to_list(l); if (r < 0) return r; } return 0; } static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) { int r; assert(link); assert(carrier); if (link == carrier) return 0; if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex))) return 0; r = hashmap_ensure_put(h, NULL, INT_TO_PTR(carrier->ifindex), carrier); if (r < 0) return r; link_dirty(link); return 0; } static int link_new_bound_by_list(Link *link) { Manager *m; Link *carrier; int r; assert(link); assert(link->manager); m = link->manager; HASHMAP_FOREACH(carrier, m->links_by_index) { if (!carrier->network) continue; if (strv_isempty(carrier->network->bind_carrier)) continue; if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) { r = link_put_carrier(link, carrier, &link->bound_by_links); if (r < 0) return r; } } HASHMAP_FOREACH(carrier, link->bound_by_links) { r = link_put_carrier(carrier, link, &carrier->bound_to_links); if (r < 0) return r; } return 0; } static int link_new_bound_to_list(Link *link) { Manager *m; Link *carrier; int r; assert(link); assert(link->manager); if (!link->network) return 0; if (strv_isempty(link->network->bind_carrier)) return 0; m = link->manager; HASHMAP_FOREACH(carrier, m->links_by_index) { if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) { r = link_put_carrier(link, carrier, &link->bound_to_links); if (r < 0) return r; } } HASHMAP_FOREACH(carrier, link->bound_to_links) { r = link_put_carrier(carrier, link, &carrier->bound_by_links); if (r < 0) return r; } return 0; } static void link_free_bound_to_list(Link *link) { bool updated = false; Link *bound_to; assert(link); while ((bound_to = hashmap_steal_first(link->bound_to_links))) { updated = true; if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex))) link_dirty(bound_to); } if (updated) link_dirty(link); } static void link_free_bound_by_list(Link *link) { bool updated = false; Link *bound_by; assert(link); while ((bound_by = hashmap_steal_first(link->bound_by_links))) { updated = true; if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) { link_dirty(bound_by); link_handle_bound_to_list(bound_by); } } if (updated) link_dirty(link); } static int link_append_to_master(Link *link) { Link *master; int r; assert(link); /* - The link may have no master. * - RTM_NEWLINK message about master interface may not be received yet. */ if (link_get_master(link, &master) < 0) return 0; r = set_ensure_put(&master->slaves, NULL, link); if (r <= 0) return r; link_ref(link); return 0; } static void link_drop_from_master(Link *link) { Link *master; assert(link); if (!link->manager) return; if (link_get_master(link, &master) < 0) return; link_unref(set_remove(master->slaves, link)); } static int link_drop_requests(Link *link) { Request *req; int ret = 0; assert(link); assert(link->manager); ORDERED_SET_FOREACH(req, link->manager->request_queue) { if (req->link != link) continue; /* If the request is already called, but its reply is not received, then we need to * drop the configuration (e.g. address) here. Note, if the configuration is known, * it will be handled later by link_drop_unmanaged_addresses() or so. */ if (req->waiting_reply && link->state != LINK_STATE_LINGER) switch (req->type) { case REQUEST_TYPE_ADDRESS: { Address *address = ASSERT_PTR(req->userdata); if (address_get(link, address, NULL) < 0) RET_GATHER(ret, address_remove(address, link)); break; } case REQUEST_TYPE_NEIGHBOR: { Neighbor *neighbor = ASSERT_PTR(req->userdata); if (neighbor_get(link, neighbor, NULL) < 0) RET_GATHER(ret, neighbor_remove(neighbor, link)); break; } case REQUEST_TYPE_NEXTHOP: { NextHop *nexthop = ASSERT_PTR(req->userdata); if (nexthop_get_by_id(link->manager, nexthop->id, NULL) < 0) RET_GATHER(ret, nexthop_remove(nexthop, link->manager)); break; } case REQUEST_TYPE_ROUTE: { Route *route = ASSERT_PTR(req->userdata); if (route_get(link->manager, route, NULL) < 0) RET_GATHER(ret, route_remove(route, link->manager)); break; } default: ; } request_detach(req); } return ret; } static Link *link_drop(Link *link) { if (!link) return NULL; assert(link->manager); link_set_state(link, LINK_STATE_LINGER); /* Drop all references from other links and manager. Note that async netlink calls may have * references to the link, and they will be dropped when we receive replies. */ (void) link_drop_requests(link); link_free_bound_to_list(link); link_free_bound_by_list(link); link_clear_sr_iov_ifindices(link); link_drop_from_master(link); if (link->state_file) (void) unlink(link->state_file); link_clean(link); STRV_FOREACH(n, link->alternative_names) hashmap_remove(link->manager->links_by_name, *n); hashmap_remove(link->manager->links_by_name, link->ifname); /* bonding master and its slaves have the same hardware address. */ hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link); /* The following must be called at last. */ assert_se(hashmap_remove(link->manager->links_by_index, INT_TO_PTR(link->ifindex)) == link); return link_unref(link); } static int link_drop_unmanaged_config(Link *link) { int r; assert(link); assert(link->state == LINK_STATE_CONFIGURING); assert(link->manager); r = link_drop_unmanaged_routes(link); RET_GATHER(r, link_drop_unmanaged_nexthops(link)); RET_GATHER(r, link_drop_unmanaged_addresses(link)); RET_GATHER(r, link_drop_unmanaged_neighbors(link)); RET_GATHER(r, link_drop_unmanaged_routing_policy_rules(link)); return r; } static int link_drop_static_config(Link *link) { int r; assert(link); assert(link->manager); r = link_drop_static_routes(link); RET_GATHER(r, link_drop_static_nexthops(link)); RET_GATHER(r, link_drop_static_addresses(link)); RET_GATHER(r, link_drop_static_neighbors(link)); RET_GATHER(r, link_drop_static_routing_policy_rules(link)); return r; } static int link_drop_dynamic_config(Link *link, Network *network) { int r; assert(link); assert(link->network); /* Drop unnecessary dynamic configurations gracefully, e.g. drop DHCP lease in the case that * previously DHCP=yes and now DHCP=no, but keep DHCP lease when DHCP setting is unchanged. */ r = link_drop_ndisc_config(link, network); RET_GATHER(r, link_drop_radv_config(link, network)); /* Stop before dropping DHCP-PD prefixes. */ RET_GATHER(r, link_drop_ipv4ll_config(link, network)); /* Stop before DHCPv4 client. */ RET_GATHER(r, link_drop_dhcp4_config(link, network)); RET_GATHER(r, link_drop_dhcp6_config(link, network)); RET_GATHER(r, link_drop_dhcp_pd_config(link, network)); link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server); link->lldp_rx = sd_lldp_rx_unref(link->lldp_rx); /* TODO: keep the received neighbors. */ link->lldp_tx = sd_lldp_tx_unref(link->lldp_tx); /* Even if we do not release DHCP lease or so, reset 'configured' flags. Otherwise, e.g. if * previously UseDNS= was disabled but is now enabled, link will enter configured state before * expected DNS servers being acquired. */ link->ipv4ll_address_configured = false; link->dhcp4_configured = false; link->dhcp6_configured = false; link->dhcp_pd_configured = false; link->ndisc_configured = false; return r; } static int link_configure(Link *link) { int r; assert(link); assert(link->network); assert(link->state == LINK_STATE_INITIALIZED); link_set_state(link, LINK_STATE_CONFIGURING); r = link_drop_unmanaged_config(link); if (r < 0) return r; r = link_new_bound_to_list(link); if (r < 0) return r; r = link_request_traffic_control(link); if (r < 0) return r; r = link_configure_mtu(link); if (r < 0) return r; if (link->iftype == ARPHRD_CAN) { /* let's shortcut things for CAN which doesn't need most of what's done below. */ r = link_request_to_set_can(link); if (r < 0) return r; return link_request_to_activate(link); } r = link_request_sr_iov_vfs(link); if (r < 0) return r; r = link_set_sysctl(link); if (r < 0) return r; r = link_request_to_set_mac(link, /* allow_retry = */ true); if (r < 0) return r; r = link_request_to_set_ipoib(link); if (r < 0) return r; r = link_request_to_set_flags(link); if (r < 0) return r; r = link_request_to_set_group(link); if (r < 0) return r; r = link_request_to_set_addrgen_mode(link); if (r < 0) return r; r = link_request_to_set_master(link); if (r < 0) return r; r = link_request_stacked_netdevs(link, _NETDEV_LOCAL_ADDRESS_TYPE_INVALID); if (r < 0) return r; r = link_request_to_set_bond(link); if (r < 0) return r; r = link_request_to_set_bridge(link); if (r < 0) return r; r = link_request_to_set_bridge_vlan(link); if (r < 0) return r; r = link_request_to_activate(link); if (r < 0) return r; r = ipv4ll_configure(link); if (r < 0) return r; r = link_request_dhcp4_client(link); if (r < 0) return r; r = link_request_dhcp6_client(link); if (r < 0) return r; r = link_request_ndisc(link); if (r < 0) return r; r = link_request_dhcp_server(link); if (r < 0) return r; r = link_request_radv(link); if (r < 0) return r; r = link_lldp_rx_configure(link); if (r < 0) return r; r = link_lldp_tx_configure(link); if (r < 0) return r; r = link_request_static_configs(link); if (r < 0) return r; if (!link_has_carrier(link)) return 0; return link_acquire_dynamic_conf(link); } static int link_get_network(Link *link, Network **ret) { Network *network; int r; assert(link); assert(link->manager); assert(ret); ORDERED_HASHMAP_FOREACH(network, link->manager->networks) { bool warn = false; r = net_match_config( &network->match, link->dev, &link->hw_addr, &link->permanent_hw_addr, link->driver, link->iftype, link->kind, link->ifname, link->alternative_names, link->wlan_iftype, link->ssid, &link->bssid); if (r < 0) return r; if (r == 0) continue; if (network->match.ifname && link->dev) { uint8_t name_assign_type = NET_NAME_UNKNOWN; const char *attr; if (sd_device_get_sysattr_value(link->dev, "name_assign_type", &attr) >= 0) (void) safe_atou8(attr, &name_assign_type); warn = name_assign_type == NET_NAME_ENUM; } log_link_full(link, warn ? LOG_WARNING : LOG_DEBUG, "Found matching .network file%s: %s", warn ? ", based on potentially unpredictable interface name" : "", network->filename); if (network->unmanaged) return -ENOENT; *ret = network; return 0; } return log_link_debug_errno(link, SYNTHETIC_ERRNO(ENOENT), "No matching .network found."); } static void link_enter_unmanaged(Link *link) { assert(link); if (link->state == LINK_STATE_UNMANAGED) return; log_link_full(link, link->state == LINK_STATE_INITIALIZED ? LOG_DEBUG : LOG_INFO, "Unmanaging interface."); (void) link_stop_engines(link, /* may_keep_dynamic = */ false); (void) link_drop_requests(link); (void) link_drop_static_config(link); /* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the * bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will * not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the * map here, as it depends on .network files assigned to other links. */ link_free_bound_to_list(link); link_free_engines(link); link->network = network_unref(link->network); link_set_state(link, LINK_STATE_UNMANAGED); } int link_reconfigure_impl(Link *link, LinkReconfigurationFlag flags) { Network *network = NULL; int r; assert(link); assert(link->manager); link_assign_netdev(link); if (link->manager->state != MANAGER_RUNNING) return 0; if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER)) return 0; r = link_get_network(link, &network); if (r == -ENOENT) { link_enter_unmanaged(link); return 0; } if (r < 0) return r; if (link->network == network && !FLAGS_SET(flags, LINK_RECONFIGURE_UNCONDITIONALLY)) return 0; _cleanup_free_ char *joined = strv_join(network->dropins, ", "); if (link->network) log_link_info(link, "Reconfiguring with %s%s%s%s.", network->filename, isempty(joined) ? "" : " (dropins: ", joined, isempty(joined) ? "" : ")"); else log_link_info(link, "Configuring with %s%s%s%s.", network->filename, isempty(joined) ? "" : " (dropins: ", joined, isempty(joined) ? "" : ")"); /* Dropping configurations based on the old .network file. */ r = link_drop_requests(link); if (r < 0) return r; /* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the * bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will * not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the * map here, as it depends on .network files assigned to other links. */ link_free_bound_to_list(link); _cleanup_(network_unrefp) Network *old_network = TAKE_PTR(link->network); /* Then, apply new .network file */ link->network = network_ref(network); if (FLAGS_SET(network->keep_configuration, KEEP_CONFIGURATION_DYNAMIC) || !FLAGS_SET(flags, LINK_RECONFIGURE_CLEANLY)) { /* To make 'networkctl reconfigure INTERFACE' work safely for an interface whose new .network * file has KeepConfiguration=dynamic or yes, even if a clean reconfiguration is requested, * drop only unnecessary or possibly being changed dynamic configurations here. */ r = link_drop_dynamic_config(link, old_network); if (r < 0) return r; } else { /* Otherwise, stop DHCP client and friends unconditionally, and drop all dynamic * configurations like DHCP address and routes. */ r = link_stop_engines(link, /* may_keep_dhcp = */ false); if (r < 0) return r; /* Free DHCP client and friends. */ link_free_engines(link); } link_update_operstate(link, true); link_dirty(link); link_set_state(link, LINK_STATE_INITIALIZED); link->activated = false; r = link_configure(link); if (r < 0) return r; return 1; } typedef struct LinkReconfigurationData { Manager *manager; Link *link; LinkReconfigurationFlag flags; sd_bus_message *message; unsigned *counter; } LinkReconfigurationData; static LinkReconfigurationData* link_reconfiguration_data_free(LinkReconfigurationData *data) { if (!data) return NULL; link_unref(data->link); sd_bus_message_unref(data->message); return mfree(data); } DEFINE_TRIVIAL_CLEANUP_FUNC(LinkReconfigurationData*, link_reconfiguration_data_free); static void link_reconfiguration_data_destroy_callback(LinkReconfigurationData *data) { int r; assert(data); if (data->message) { if (data->counter) { assert(*data->counter > 0); (*data->counter)--; } if (!data->counter || *data->counter <= 0) { /* Update the state files before replying the bus method. Otherwise, * systemd-networkd-wait-online following networkctl reload/reconfigure may read an * outdated state file and wrongly handle an interface is already in the configured * state. */ (void) manager_clean_all(data->manager); r = sd_bus_reply_method_return(data->message, NULL); if (r < 0) log_warning_errno(r, "Failed to reply for DBus method, ignoring: %m"); } } link_reconfiguration_data_free(data); } static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, LinkReconfigurationData *data) { Link *link = ASSERT_PTR(ASSERT_PTR(data)->link); int r; r = link_getlink_handler_internal(rtnl, m, link, "Failed to update link state"); if (r <= 0) return r; r = link_reconfigure_impl(link, data->flags); if (r < 0) { link_enter_failed(link); return 0; } return r; } int link_reconfigure_full(Link *link, LinkReconfigurationFlag flags, sd_bus_message *message, unsigned *counter) { _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; _cleanup_(link_reconfiguration_data_freep) LinkReconfigurationData *data = NULL; int r; assert(link); assert(link->manager); assert(link->manager->rtnl); /* When the link is in the pending or initialized state, link_reconfigure_impl() will be called later * by link_initialized() or link_initialized_and_synced(). To prevent the function from being called * multiple times simultaneously, let's refuse to reconfigure the interface here in such cases. */ if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER)) return 0; /* 0 means no-op. */ data = new(LinkReconfigurationData, 1); if (!data) { r = -ENOMEM; goto failed; } *data = (LinkReconfigurationData) { .manager = link->manager, .link = link_ref(link), .flags = flags, .message = sd_bus_message_ref(message), /* message may be NULL, but _ref() works fine. */ .counter = counter, }; r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex); if (r < 0) goto failed; r = netlink_call_async(link->manager->rtnl, NULL, req, link_reconfigure_handler, link_reconfiguration_data_destroy_callback, data); if (r < 0) goto failed; TAKE_PTR(data); if (counter) (*counter)++; if (link->state == LINK_STATE_FAILED) link_set_state(link, LINK_STATE_INITIALIZED); return 1; /* 1 means the interface will be reconfigured, and bus method will be replied later. */ failed: log_link_warning_errno(link, r, "Failed to reconfigure interface: %m"); link_enter_failed(link); return r; } static int link_initialized_and_synced(Link *link) { int r; assert(link); assert(link->manager); if (link->state == LINK_STATE_PENDING) { log_link_debug(link, "Link state is up-to-date"); link_set_state(link, LINK_STATE_INITIALIZED); r = link_new_bound_by_list(link); if (r < 0) return r; r = link_handle_bound_by_list(link); if (r < 0) return r; } return link_reconfigure_impl(link, /* flags = */ 0); } static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { int r; r = link_getlink_handler_internal(rtnl, m, link, "Failed to wait for the interface to be initialized"); if (r <= 0) return r; r = link_initialized_and_synced(link); if (r < 0) link_enter_failed(link); return 0; } static int link_initialized(Link *link, sd_device *device) { int r; assert(link); assert(device); /* Always replace with the new sd_device object. As the sysname (and possibly other properties * or sysattrs) may be outdated. */ device_unref_and_replace(link->dev, device); if (link->dhcp_client) { r = sd_dhcp_client_attach_device(link->dhcp_client, link->dev); if (r < 0) log_link_warning_errno(link, r, "Failed to attach device to DHCPv4 client, ignoring: %m"); } if (link->dhcp6_client) { r = sd_dhcp6_client_attach_device(link->dhcp6_client, link->dev); if (r < 0) log_link_warning_errno(link, r, "Failed to attach device to DHCPv6 client, ignoring: %m"); } r = link_set_sr_iov_ifindices(link); if (r < 0) log_link_warning_errno(link, r, "Failed to manage SR-IOV PF and VF ports, ignoring: %m"); if (link->state != LINK_STATE_PENDING) return link_reconfigure(link, /* flags = */ 0); log_link_debug(link, "udev initialized link"); /* udev has initialized the link, but we don't know if we have yet * processed the NEWLINK messages with the latest state. Do a GETLINK, * when it returns we know that the pending NEWLINKs have already been * processed and that we are up-to-date */ return link_call_getlink(link, link_initialized_handler); } int link_check_initialized(Link *link) { _cleanup_(sd_device_unrefp) sd_device *device = NULL; int r; assert(link); if (!udev_available()) return link_initialized_and_synced(link); /* udev should be around */ r = sd_device_new_from_ifindex(&device, link->ifindex); if (r < 0) { log_link_debug_errno(link, r, "Could not find device, waiting for device initialization: %m"); return 0; } r = device_is_processed(device); if (r < 0) return log_link_warning_errno(link, r, "Could not determine whether the device is processed by udevd: %m"); if (r == 0) { /* not yet ready */ log_link_debug(link, "link pending udev initialization..."); return 0; } r = device_is_renaming(device); if (r < 0) return log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m"); if (r > 0) { log_link_debug(link, "Interface is being renamed, pending initialization."); return 0; } return link_initialized(link, device); } int manager_udev_process_link(Manager *m, sd_device *device, sd_device_action_t action) { int r, ifindex; const char *s; Link *link; assert(m); assert(device); r = sd_device_get_ifindex(device, &ifindex); if (r < 0) return log_device_debug_errno(device, r, "Failed to get ifindex: %m"); r = link_get_by_index(m, ifindex, &link); if (r < 0) { /* This error is not critical, as the corresponding rtnl message may be received later. */ log_device_debug_errno(device, r, "Failed to get link from ifindex %i, ignoring: %m", ifindex); return 0; } /* Let's unref the sd-device object assigned to the corresponding Link object, but keep the Link * object here. It will be removed only when rtnetlink says so. */ if (action == SD_DEVICE_REMOVE) { link->dev = sd_device_unref(link->dev); return 0; } r = device_is_renaming(device); if (r < 0) return log_device_debug_errno(device, r, "Failed to determine if the device is renaming or not: %m"); if (r > 0) { log_device_debug(device, "Device is renaming, waiting for the interface to be renamed."); /* TODO: * What happens when a device is initialized, then soon renamed after that? When we detect * such, maybe we should cancel or postpone all queued requests for the interface. */ return 0; } r = sd_device_get_property_value(device, "ID_NET_MANAGED_BY", &s); if (r < 0 && r != -ENOENT) log_device_debug_errno(device, r, "Failed to get ID_NET_MANAGED_BY udev property, ignoring: %m"); if (r >= 0 && !streq(s, "io.systemd.Network")) { log_device_debug(device, "Interface is requested to be managed by '%s', not managing the interface.", s); link_set_state(link, LINK_STATE_UNMANAGED); return 0; } r = link_initialized(link, device); if (r < 0) link_enter_failed(link); return 0; } static int link_carrier_gained(Link *link) { LinkReconfigurationFlag flags = 0; int r; assert(link); r = event_source_disable(link->carrier_lost_timer); if (r < 0) log_link_warning_errno(link, r, "Failed to disable carrier lost timer, ignoring: %m"); /* Process BindCarrier= setting specified by other interfaces. This is independent of the .network * file assigned to this interface, but depends on .network files assigned to other interfaces. * Hence, this can and should be called earlier. */ r = link_handle_bound_by_list(link); if (r < 0) return r; /* If a wireless interface was connected to an access point, and the SSID is changed (that is, * both previous_ssid and ssid are non-NULL), then the connected wireless network could be * changed. So, always reconfigure the link. Which means e.g. the DHCP client will be * restarted, and the correct network information will be gained. * * However, do not reconfigure the wireless interface forcibly if it was not connected to any * access points previously (previous_ssid is NULL in this case). As, a .network file may be * already assigned to the interface (in that case, the .network file does not have the SSID= * setting in the [Match] section), and the interface is already being configured. Of course, * there may exist another .network file with higher priority and a matching SSID= setting. But * in that case, link_reconfigure_impl() can handle that without any flags. * * For non-wireless interfaces, we have no way to detect the connected network change. So, * we do not set any flags here. Note, both ssid and previous_ssid are NULL in that case. */ if (link->previous_ssid && !streq_ptr(link->previous_ssid, link->ssid)) flags |= LINK_RECONFIGURE_UNCONDITIONALLY | LINK_RECONFIGURE_CLEANLY; link->previous_ssid = mfree(link->previous_ssid); /* AP and P2P-GO interfaces may have a new SSID - update the link properties in case a new .network * profile wants to match on it with SSID= in its [Match] section. */ if (IN_SET(link->wlan_iftype, NL80211_IFTYPE_AP, NL80211_IFTYPE_P2P_GO)) { r = link_get_wlan_interface(link); if (r < 0) return r; } /* At this stage, both wlan and link information should be up-to-date. Hence, it is not necessary to * call RTM_GETLINK, NL80211_CMD_GET_INTERFACE, or NL80211_CMD_GET_STATION commands, and simply call * link_reconfigure_impl(). Note, link_reconfigure_impl() returns 1 when the link is reconfigured. */ r = link_reconfigure_impl(link, flags); if (r != 0) return r; if (link->iftype == ARPHRD_CAN) /* let's shortcut things for CAN which doesn't need most of what's done below. */ return 0; if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) { r = link_acquire_dynamic_conf(link); if (r < 0) return r; r = link_request_static_configs(link); if (r < 0) return r; } return 0; } static int link_carrier_lost_impl(Link *link) { int ret = 0; assert(link); link->previous_ssid = mfree(link->previous_ssid); ret = link_handle_bound_by_list(link); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return ret; if (!link->network) return ret; RET_GATHER(ret, link_stop_engines(link, /* may_keep_dynamic = */ false)); RET_GATHER(ret, link_drop_static_config(link)); return ret; } static int link_carrier_lost_handler(sd_event_source *s, uint64_t usec, void *userdata) { Link *link = ASSERT_PTR(userdata); int r; r = link_carrier_lost_impl(link); if (r < 0) { log_link_warning_errno(link, r, "Failed to process carrier lost event: %m"); link_enter_failed(link); } return 0; } static int link_carrier_lost(Link *link) { uint16_t dhcp_mtu; usec_t usec; assert(link); if (link->iftype == ARPHRD_CAN) /* let's shortcut things for CAN which doesn't need most of what's done below. */ usec = 0; else if (!link->network) usec = 0; else if (link->network->ignore_carrier_loss_set) /* If IgnoreCarrierLoss= is explicitly specified, then use the specified value. */ usec = link->network->ignore_carrier_loss_usec; else if (link->network->bond && link->wlan_iftype > 0) /* Enslaving wlan interface to a bond disconnects from the connected AP, and causes its * carrier to be lost. See #19832. */ usec = 3 * USEC_PER_SEC; else if (link->network->dhcp_use_mtu && link->dhcp_lease && sd_dhcp_lease_get_mtu(link->dhcp_lease, &dhcp_mtu) >= 0 && dhcp_mtu != link->original_mtu) /* Some drivers reset interfaces when changing MTU. Resetting interfaces by the static * MTU should not cause any issues, as MTU is changed only once. However, setting MTU * through DHCP lease causes an infinite loop of resetting the interface. See #18738. */ usec = 5 * USEC_PER_SEC; else /* Otherwise, use the implied default value. */ usec = link->network->ignore_carrier_loss_usec; if (usec == USEC_INFINITY) return 0; if (usec == 0) return link_carrier_lost_impl(link); return event_reset_time_relative(link->manager->event, &link->carrier_lost_timer, CLOCK_BOOTTIME, usec, 0, link_carrier_lost_handler, link, 0, "link-carrier-loss", true); } static int link_admin_state_up(Link *link) { assert(link); /* This is called every time an interface admin state changes to up; * specifically, when IFF_UP flag changes from unset to set. */ if (!link->network) return 0; if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_DOWN) { log_link_info(link, "Activation policy is \"always-down\", forcing link down."); return link_request_to_bring_up_or_down(link, /* up = */ false); } /* We set the ipv6 mtu after the device mtu, but the kernel resets * ipv6 mtu on NETDEV_UP, so we need to reset it. */ (void) link_set_ipv6_mtu(link, LOG_INFO); return 0; } static int link_admin_state_down(Link *link) { assert(link); link_forget_nexthops(link); link_forget_routes(link); if (!link->network) return 0; if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) { log_link_info(link, "Activation policy is \"always-up\", forcing link up."); return link_request_to_bring_up_or_down(link, /* up = */ true); } return 0; } static bool link_is_enslaved(Link *link) { if (link->flags & IFF_SLAVE) return true; if (link->master_ifindex > 0) return true; return false; } void link_update_operstate(Link *link, bool also_update_master) { LinkOperationalState operstate; LinkCarrierState carrier_state; LinkAddressState ipv4_address_state, ipv6_address_state, address_state; LinkOnlineState online_state; _cleanup_strv_free_ char **p = NULL; bool changed = false; assert(link); if (link->kernel_operstate == IF_OPER_DORMANT) carrier_state = LINK_CARRIER_STATE_DORMANT; else if (link_has_carrier(link)) { if (link_is_enslaved(link)) carrier_state = LINK_CARRIER_STATE_ENSLAVED; else carrier_state = LINK_CARRIER_STATE_CARRIER; } else if (link->flags & IFF_UP) carrier_state = LINK_CARRIER_STATE_NO_CARRIER; else carrier_state = LINK_CARRIER_STATE_OFF; if (carrier_state >= LINK_CARRIER_STATE_CARRIER) { Link *slave; SET_FOREACH(slave, link->slaves) { link_update_operstate(slave, false); if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER) carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER; } } link_get_address_states(link, &ipv4_address_state, &ipv6_address_state, &address_state); /* Mapping of address and carrier state vs operational state * carrier state * | off | no-carrier | dormant | degraded-carrier | carrier | enslaved * ------------------------------------------------------------------------------ * off | off | no-carrier | dormant | degraded-carrier | carrier | enslaved * address_state degraded | off | no-carrier | dormant | degraded | degraded | enslaved * routable | off | no-carrier | dormant | routable | routable | routable */ if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_ROUTABLE) operstate = LINK_OPERSTATE_ROUTABLE; else if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_DEGRADED) operstate = LINK_OPERSTATE_DEGRADED; else if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF) operstate = (LinkOperationalState) carrier_state; else if (address_state == LINK_ADDRESS_STATE_ROUTABLE) operstate = LINK_OPERSTATE_ROUTABLE; else if (carrier_state == LINK_CARRIER_STATE_CARRIER) operstate = LINK_OPERSTATE_DEGRADED; else operstate = LINK_OPERSTATE_ENSLAVED; LinkOperationalStateRange req; link_required_operstate_for_online(link, &req); /* Only determine online state for managed links with RequiredForOnline=yes */ if (!link->network || !link->network->required_for_online) online_state = _LINK_ONLINE_STATE_INVALID; else if (!operational_state_is_in_range(operstate, &req)) online_state = LINK_ONLINE_STATE_OFFLINE; else { AddressFamily required_family = link_required_family_for_online(link); bool needs_ipv4 = required_family & ADDRESS_FAMILY_IPV4; bool needs_ipv6 = required_family & ADDRESS_FAMILY_IPV6; /* The operational state is within the range required for online. * If a particular address family is also required, we might revert * to offline in the blocks below. */ online_state = LINK_ONLINE_STATE_ONLINE; if (req.min >= LINK_OPERSTATE_DEGRADED) { if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_DEGRADED) online_state = LINK_ONLINE_STATE_OFFLINE; if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_DEGRADED) online_state = LINK_ONLINE_STATE_OFFLINE; } if (req.min >= LINK_OPERSTATE_ROUTABLE) { if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_ROUTABLE) online_state = LINK_ONLINE_STATE_OFFLINE; if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_ROUTABLE) online_state = LINK_ONLINE_STATE_OFFLINE; } } if (link->carrier_state != carrier_state) { link->carrier_state = carrier_state; changed = true; if (strv_extend(&p, "CarrierState") < 0) log_oom(); } if (link->address_state != address_state) { link->address_state = address_state; changed = true; if (strv_extend(&p, "AddressState") < 0) log_oom(); } if (link->ipv4_address_state != ipv4_address_state) { link->ipv4_address_state = ipv4_address_state; changed = true; if (strv_extend(&p, "IPv4AddressState") < 0) log_oom(); } if (link->ipv6_address_state != ipv6_address_state) { link->ipv6_address_state = ipv6_address_state; changed = true; if (strv_extend(&p, "IPv6AddressState") < 0) log_oom(); } if (link->operstate != operstate) { link->operstate = operstate; changed = true; if (strv_extend(&p, "OperationalState") < 0) log_oom(); } if (link->online_state != online_state) { link->online_state = online_state; changed = true; if (strv_extend(&p, "OnlineState") < 0) log_oom(); } if (p) link_send_changed_strv(link, p); if (changed) link_dirty(link); if (also_update_master) { Link *master; if (link_get_master(link, &master) >= 0) link_update_operstate(master, true); } } #define FLAG_STRING(string, flag, old, new) \ (((old ^ new) & flag) \ ? ((old & flag) ? (" -" string) : (" +" string)) \ : "") static int link_update_flags(Link *link, sd_netlink_message *message) { bool link_was_admin_up, had_carrier; uint8_t operstate; unsigned flags; int r; assert(link); assert(message); r = sd_rtnl_message_link_get_flags(message, &flags); if (r < 0) return log_link_debug_errno(link, r, "rtnl: failed to read link flags: %m"); r = sd_netlink_message_read_u8(message, IFLA_OPERSTATE, &operstate); if (r == -ENODATA) /* If we got a message without operstate, assume the state was unchanged. */ operstate = link->kernel_operstate; else if (r < 0) return log_link_debug_errno(link, r, "rtnl: failed to read operational state: %m"); if (link->flags == flags && link->kernel_operstate == operstate) return 0; if (link->flags != flags) { unsigned unknown_flags, unknown_flags_added, unknown_flags_removed; 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", FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags), FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags), FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags), FLAG_STRING("UP", IFF_UP, link->flags, flags), FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags), FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags), FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags), FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags), FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags), FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags), FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags), FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags), FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags), FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags), FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags), FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags), FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags), FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags), FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags)); unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP | IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING | IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT | IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL | IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP | IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO); unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags); unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags); if (unknown_flags_added) log_link_debug(link, "Unknown link flags gained, ignoring: %#.5x", unknown_flags_added); if (unknown_flags_removed) log_link_debug(link, "Unknown link flags lost, ignoring: %#.5x", unknown_flags_removed); } link_was_admin_up = link->flags & IFF_UP; had_carrier = link_has_carrier(link); link->flags = flags; link->kernel_operstate = operstate; link_update_operstate(link, true); if (!link_was_admin_up && (link->flags & IFF_UP)) { log_link_info(link, "Link UP"); r = link_admin_state_up(link); if (r < 0) return r; } else if (link_was_admin_up && !(link->flags & IFF_UP)) { log_link_info(link, "Link DOWN"); r = link_admin_state_down(link); if (r < 0) return r; } if (!had_carrier && link_has_carrier(link)) { log_link_info(link, "Gained carrier"); r = link_carrier_gained(link); if (r < 0) return r; } else if (had_carrier && !link_has_carrier(link)) { log_link_info(link, "Lost carrier"); r = link_carrier_lost(link); if (r < 0) return r; } return 0; } static int link_update_master(Link *link, sd_netlink_message *message) { int master_ifindex, r; assert(link); assert(message); r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t*) &master_ifindex); if (r == -ENODATA) return 0; if (r < 0) return log_link_debug_errno(link, r, "rtnl: failed to read master ifindex: %m"); if (master_ifindex == link->ifindex) master_ifindex = 0; if (master_ifindex != link->master_ifindex) { if (link->master_ifindex == 0) log_link_debug(link, "Attached to master interface: %i", master_ifindex); else if (master_ifindex == 0) log_link_debug(link, "Detached from master interface: %i", link->master_ifindex); else log_link_debug(link, "Master interface changed: %i %s %i", link->master_ifindex, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), master_ifindex); link_drop_from_master(link); link->master_ifindex = master_ifindex; } r = link_append_to_master(link); if (r < 0) return log_link_debug_errno(link, r, "Failed to append link to master: %m"); return 0; } static int link_update_driver(Link *link, sd_netlink_message *message) { int r; assert(link); assert(link->manager); assert(message); /* Driver is already read. Assuming the driver is never changed. */ if (link->ethtool_driver_read) return 0; /* When udevd is running, read the driver after the interface is initialized by udevd. * Otherwise, ethtool may not work correctly. See issue #22538. * When udevd is not running, read the value when the interface is detected. */ if (udev_available() && !link->dev) return 0; link->ethtool_driver_read = true; r = ethtool_get_driver(&link->manager->ethtool_fd, link->ifname, &link->driver); if (r < 0) { log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m"); return 0; } log_link_debug(link, "Found driver: %s", strna(link->driver)); if (streq_ptr(link->driver, "dsa")) { uint32_t dsa_master_ifindex = 0; r = sd_netlink_message_read_u32(message, IFLA_LINK, &dsa_master_ifindex); if (r < 0 && r != -ENODATA) return log_link_debug_errno(link, r, "rtnl: failed to read ifindex of the DSA master interface: %m"); if (dsa_master_ifindex > INT_MAX) { log_link_debug(link, "rtnl: received too large DSA master ifindex (%"PRIu32" > INT_MAX), ignoring.", dsa_master_ifindex); dsa_master_ifindex = 0; } link->dsa_master_ifindex = (int) dsa_master_ifindex; } return 1; /* needs reconfigure */ } static int link_update_permanent_hardware_address_from_ethtool(Link *link, sd_netlink_message *message) { int r; assert(link); assert(link->manager); assert(message); if (link->ethtool_permanent_hw_addr_read) return 0; /* When udevd is running, read the permanent hardware address after the interface is * initialized by udevd. Otherwise, ethtool may not work correctly. See issue #22538. * When udevd is not running, read the value when the interface is detected. */ if (udev_available() && !link->dev) return 0; /* If the interface does not have a hardware address, then it will not have a permanent address either. */ r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, NULL); if (r == -ENODATA) return 0; if (r < 0) return log_link_debug_errno(link, r, "Failed to read IFLA_ADDRESS attribute: %m"); link->ethtool_permanent_hw_addr_read = true; r = ethtool_get_permanent_hw_addr(&link->manager->ethtool_fd, link->ifname, &link->permanent_hw_addr); if (r < 0) log_link_debug_errno(link, r, "Permanent hardware address not found, continuing without: %m"); return 0; } static int link_update_permanent_hardware_address(Link *link, sd_netlink_message *message) { int r; assert(link); assert(link->manager); assert(message); if (link->permanent_hw_addr.length > 0) return 0; r = netlink_message_read_hw_addr(message, IFLA_PERM_ADDRESS, &link->permanent_hw_addr); if (r < 0) { if (r != -ENODATA) return log_link_debug_errno(link, r, "Failed to read IFLA_PERM_ADDRESS attribute: %m"); /* Fallback to ethtool for older kernels. */ r = link_update_permanent_hardware_address_from_ethtool(link, message); if (r < 0) return r; } if (link->permanent_hw_addr.length > 0) log_link_debug(link, "Saved permanent hardware address: %s", HW_ADDR_TO_STR(&link->permanent_hw_addr)); return 1; /* needs reconfigure */ } static int link_update_hardware_address(Link *link, sd_netlink_message *message) { struct hw_addr_data addr; int r; assert(link); assert(message); r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr); if (r < 0 && r != -ENODATA) return log_link_debug_errno(link, r, "rtnl: failed to read broadcast address: %m"); r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &addr); if (r == -ENODATA) return 0; if (r < 0) return log_link_debug_errno(link, r, "rtnl: failed to read hardware address: %m"); if (hw_addr_equal(&link->hw_addr, &addr)) return 0; if (link->hw_addr.length == 0) log_link_debug(link, "Saved hardware address: %s", HW_ADDR_TO_STR(&addr)); else { log_link_debug(link, "Hardware address is changed: %s %s %s", HW_ADDR_TO_STR(&link->hw_addr), special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), HW_ADDR_TO_STR(&addr)); hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link); } link->hw_addr = addr; if (!hw_addr_is_null(&link->hw_addr)) { r = hashmap_ensure_put(&link->manager->links_by_hw_addr, &hw_addr_hash_ops, &link->hw_addr, link); if (r == -EEXIST && streq_ptr(link->kind, "bond")) /* bonding master and its slaves have the same hardware address. */ r = hashmap_replace(link->manager->links_by_hw_addr, &link->hw_addr, link); if (r < 0) log_link_debug_errno(link, r, "Failed to manage link by its new hardware address, ignoring: %m"); } r = ipv4acd_update_mac(link); if (r < 0) return log_link_debug_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m"); r = ipv4ll_update_mac(link); if (r < 0) return log_link_debug_errno(link, r, "Could not update MAC address in IPv4LL client: %m"); r = dhcp4_update_mac(link); if (r < 0) return log_link_debug_errno(link, r, "Could not update MAC address in DHCP client: %m"); r = dhcp6_update_mac(link); if (r < 0) return log_link_debug_errno(link, r, "Could not update MAC address in DHCPv6 client: %m"); r = radv_update_mac(link); if (r < 0) return log_link_debug_errno(link, r, "Could not update MAC address for Router Advertisement: %m"); if (link->ndisc && link->hw_addr.length == ETH_ALEN) { r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether); if (r < 0) return log_link_debug_errno(link, r, "Could not update MAC for NDisc: %m"); } if (link->lldp_rx) { r = sd_lldp_rx_set_filter_address(link->lldp_rx, &link->hw_addr.ether); if (r < 0) return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Rx: %m"); } if (link->lldp_tx) { r = sd_lldp_tx_set_hwaddr(link->lldp_tx, &link->hw_addr.ether); if (r < 0) return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Tx: %m"); } return 1; /* needs reconfigure */ } static int link_update_mtu(Link *link, sd_netlink_message *message) { uint32_t mtu, min_mtu = 0, max_mtu = UINT32_MAX; int r; assert(link); assert(message); r = sd_netlink_message_read_u32(message, IFLA_MTU, &mtu); if (r == -ENODATA) return 0; if (r < 0) return log_link_debug_errno(link, r, "rtnl: failed to read MTU in RTM_NEWLINK message: %m"); if (mtu == 0) return 0; r = sd_netlink_message_read_u32(message, IFLA_MIN_MTU, &min_mtu); if (r < 0 && r != -ENODATA) return log_link_debug_errno(link, r, "rtnl: failed to read minimum MTU in RTM_NEWLINK message: %m"); r = sd_netlink_message_read_u32(message, IFLA_MAX_MTU, &max_mtu); if (r < 0 && r != -ENODATA) return log_link_debug_errno(link, r, "rtnl: failed to read maximum MTU in RTM_NEWLINK message: %m"); if (max_mtu == 0) max_mtu = UINT32_MAX; link->min_mtu = min_mtu; link->max_mtu = max_mtu; if (link->original_mtu == 0) { link->original_mtu = mtu; log_link_debug(link, "Saved original MTU %" PRIu32" (min: %"PRIu32", max: %"PRIu32")", link->original_mtu, link->min_mtu, link->max_mtu); } if (link->mtu == mtu) return 0; if (link->mtu != 0) log_link_debug(link, "MTU is changed: %"PRIu32" %s %"PRIu32" (min: %"PRIu32", max: %"PRIu32")", link->mtu, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), mtu, link->min_mtu, link->max_mtu); link->mtu = mtu; if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) /* The kernel resets IPv6 MTU after changing device MTU. So, we need to re-set IPv6 MTU again. */ (void) link_set_ipv6_mtu_async(link); if (link->dhcp_client) { r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu); if (r < 0) return log_link_debug_errno(link, r, "Could not update MTU in DHCP client: %m"); } if (link->radv) { r = sd_radv_set_mtu(link->radv, link->mtu); if (r < 0) return log_link_debug_errno(link, r, "Could not set MTU for Router Advertisement: %m"); } return 0; } static int link_update_alternative_names(Link *link, sd_netlink_message *message) { _cleanup_strv_free_ char **altnames = NULL; int r; assert(link); assert(message); r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &altnames); if (r == -ENODATA) /* The message does not have IFLA_PROP_LIST container attribute. It does not mean the * interface has no alternative name. */ return 0; if (r < 0) return log_link_debug_errno(link, r, "rtnl: failed to read alternative names: %m"); if (strv_equal(altnames, link->alternative_names)) return 0; STRV_FOREACH(n, link->alternative_names) hashmap_remove(link->manager->links_by_name, *n); strv_free_and_replace(link->alternative_names, altnames); STRV_FOREACH(n, link->alternative_names) { r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, *n, link); if (r < 0) return log_link_debug_errno(link, r, "Failed to manage link by its new alternative names: %m"); } return 1; /* needs reconfigure */ } static int link_update_name(Link *link, sd_netlink_message *message) { char ifname_from_index[IF_NAMESIZE]; const char *ifname; int r; assert(link); assert(message); r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname); if (r == -ENODATA) /* Hmm?? But ok. */ return 0; if (r < 0) return log_link_debug_errno(link, r, "Failed to read interface name in RTM_NEWLINK message: %m"); if (streq(ifname, link->ifname)) return 0; r = format_ifname(link->ifindex, ifname_from_index); if (r < 0) return log_link_debug_errno(link, r, "Could not get interface name for index %i.", link->ifindex); if (!streq(ifname, ifname_from_index)) { log_link_debug(link, "New interface name '%s' received from the kernel does not correspond " "with the name currently configured on the actual interface '%s'. Ignoring.", ifname, ifname_from_index); return 0; } log_link_info(link, "Interface name change detected, renamed to %s.", ifname); hashmap_remove(link->manager->links_by_name, link->ifname); r = free_and_strdup(&link->ifname, ifname); if (r < 0) return log_oom_debug(); r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, link->ifname, link); if (r < 0) return log_link_debug_errno(link, r, "Failed to manage link by its new name: %m"); if (link->dhcp_client) { r = sd_dhcp_client_set_ifname(link->dhcp_client, link->ifname); if (r < 0) return log_link_debug_errno(link, r, "Failed to update interface name in DHCP client: %m"); } if (link->dhcp6_client) { r = sd_dhcp6_client_set_ifname(link->dhcp6_client, link->ifname); if (r < 0) return log_link_debug_errno(link, r, "Failed to update interface name in DHCPv6 client: %m"); } if (link->ndisc) { r = sd_ndisc_set_ifname(link->ndisc, link->ifname); if (r < 0) return log_link_debug_errno(link, r, "Failed to update interface name in NDisc: %m"); } if (link->dhcp_server) { r = sd_dhcp_server_set_ifname(link->dhcp_server, link->ifname); if (r < 0) return log_link_debug_errno(link, r, "Failed to update interface name in DHCP server: %m"); } if (link->radv) { r = sd_radv_set_ifname(link->radv, link->ifname); if (r < 0) return log_link_debug_errno(link, r, "Failed to update interface name in Router Advertisement: %m"); } if (link->lldp_rx) { r = sd_lldp_rx_set_ifname(link->lldp_rx, link->ifname); if (r < 0) return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Rx: %m"); } if (link->lldp_tx) { r = sd_lldp_tx_set_ifname(link->lldp_tx, link->ifname); if (r < 0) return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Tx: %m"); } if (link->ipv4ll) { r = sd_ipv4ll_set_ifname(link->ipv4ll, link->ifname); if (r < 0) return log_link_debug_errno(link, r, "Failed to update interface name in IPv4LL client: %m"); } r = ipv4acd_set_ifname(link); if (r < 0) return log_link_debug_errno(link, r, "Failed to update interface name in IPv4ACD client: %m"); return 1; /* needs reconfigure */ } static int link_update(Link *link, sd_netlink_message *message) { bool needs_reconfigure = false; int r; assert(link); assert(message); r = link_update_name(link, message); if (r < 0) return r; needs_reconfigure = needs_reconfigure || r > 0; r = link_update_alternative_names(link, message); if (r < 0) return r; needs_reconfigure = needs_reconfigure || r > 0; r = link_update_mtu(link, message); if (r < 0) return r; r = link_update_driver(link, message); if (r < 0) return r; needs_reconfigure = needs_reconfigure || r > 0; r = link_update_permanent_hardware_address(link, message); if (r < 0) return r; needs_reconfigure = needs_reconfigure || r > 0; r = link_update_hardware_address(link, message); if (r < 0) return r; needs_reconfigure = needs_reconfigure || r > 0; r = link_update_master(link, message); if (r < 0) return r; r = link_update_ipv6ll_addrgen_mode(link, message); if (r < 0) return r; r = link_update_flags(link, message); if (r < 0) return r; r = link_update_bridge_vlan(link, message); if (r < 0) return r; return needs_reconfigure; } static Link *link_drop_or_unref(Link *link) { if (!link) return NULL; if (!link->manager) return link_unref(link); return link_drop(link); } DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_drop_or_unref); static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) { _cleanup_free_ char *ifname = NULL, *kind = NULL, *state_file = NULL, *lease_file = NULL; _cleanup_(link_drop_or_unrefp) Link *link = NULL; unsigned short iftype; int r, ifindex; assert(manager); assert(message); assert(ret); r = sd_rtnl_message_link_get_ifindex(message, &ifindex); if (r < 0) return log_debug_errno(r, "rtnl: failed to read ifindex from link message: %m"); else if (ifindex <= 0) return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "rtnl: received link message without valid ifindex."); r = sd_rtnl_message_link_get_type(message, &iftype); if (r < 0) return log_debug_errno(r, "rtnl: failed to read interface type from link message: %m"); r = sd_netlink_message_read_string_strdup(message, IFLA_IFNAME, &ifname); if (r < 0) return log_debug_errno(r, "rtnl: failed to read interface name from link message: %m"); /* check for link kind */ r = sd_netlink_message_enter_container(message, IFLA_LINKINFO); if (r >= 0) { r = sd_netlink_message_read_string_strdup(message, IFLA_INFO_KIND, &kind); if (r < 0 && r != -ENODATA) return log_debug_errno(r, "rtnl: failed to read interface kind from link message: %m"); r = sd_netlink_message_exit_container(message); if (r < 0) return log_debug_errno(r, "rtnl: failed to exit IFLA_LINKINFO container: %m"); } if (!manager->test_mode) { /* Do not update state files when running in test mode. */ if (asprintf(&state_file, "/run/systemd/netif/links/%d", ifindex) < 0) return log_oom_debug(); if (asprintf(&lease_file, "/run/systemd/netif/leases/%d", ifindex) < 0) return log_oom_debug(); } link = new(Link, 1); if (!link) return -ENOMEM; *link = (Link) { .n_ref = 1, .state = LINK_STATE_PENDING, .online_state = _LINK_ONLINE_STATE_INVALID, .automatic_reconfigure_ratelimit = (const RateLimit) { .interval = 10 * USEC_PER_SEC, .burst = 5 }, .ifindex = ifindex, .iftype = iftype, .ifname = TAKE_PTR(ifname), .kind = TAKE_PTR(kind), .bridge_vlan_pvid = UINT16_MAX, .ipv6ll_address_gen_mode = _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_INVALID, .state_file = TAKE_PTR(state_file), .lease_file = TAKE_PTR(lease_file), .n_dns = UINT_MAX, .dns_default_route = -1, .llmnr = _RESOLVE_SUPPORT_INVALID, .mdns = _RESOLVE_SUPPORT_INVALID, .dnssec_mode = _DNSSEC_MODE_INVALID, .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID, }; r = hashmap_ensure_put(&manager->links_by_index, NULL, INT_TO_PTR(link->ifindex), link); if (r < 0) return log_link_debug_errno(link, r, "Failed to store link into manager: %m"); link->manager = manager; r = hashmap_ensure_put(&manager->links_by_name, &string_hash_ops, link->ifname, link); if (r < 0) return log_link_debug_errno(link, r, "Failed to manage link by its interface name: %m"); log_link_debug(link, "Saved new link: ifindex=%i, iftype=%s(%u), kind=%s", link->ifindex, strna(arphrd_to_name(link->iftype)), link->iftype, strna(link->kind)); /* If contained in this set, the link is wireless and the corresponding NL80211_CMD_NEW_INTERFACE * message arrived too early. Request the wireless link information again. */ if (set_remove(manager->new_wlan_ifindices, INT_TO_PTR(link->ifindex))) { r = link_get_wlan_interface(link); if (r < 0) log_link_warning_errno(link, r, "Failed to get wireless interface, ignoring: %m"); } *ret = TAKE_PTR(link); return 0; } int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, Manager *manager) { Link *link = NULL; NetDev *netdev = NULL; uint16_t type; const char *name; int r, ifindex; assert(rtnl); assert(message); assert(manager); if (sd_netlink_message_is_error(message)) { r = sd_netlink_message_get_errno(message); if (r < 0) log_message_warning_errno(message, r, "rtnl: Could not receive link message, ignoring"); return 0; } r = sd_netlink_message_get_type(message, &type); if (r < 0) { log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m"); return 0; } else if (!IN_SET(type, RTM_NEWLINK, RTM_DELLINK)) { log_warning("rtnl: Received unexpected message type %u when processing link, ignoring.", type); return 0; } r = sd_rtnl_message_link_get_ifindex(message, &ifindex); if (r < 0) { log_warning_errno(r, "rtnl: Could not get ifindex from link message, ignoring: %m"); return 0; } else if (ifindex <= 0) { log_warning("rtnl: received link message with invalid ifindex %d, ignoring.", ifindex); return 0; } r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name); if (r < 0) { log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m"); return 0; } (void) link_get_by_index(manager, ifindex, &link); (void) netdev_get(manager, name, &netdev); switch (type) { case RTM_NEWLINK: if (netdev) { /* netdev exists, so make sure the ifindex matches */ r = netdev_set_ifindex(netdev, message); if (r < 0) { log_netdev_warning_errno(netdev, r, "Could not process new link message for netdev, ignoring: %m"); netdev_enter_failed(netdev); return 0; } } if (!link) { /* link is new, so add it */ r = link_new(manager, message, &link); if (r < 0) { log_warning_errno(r, "Could not process new link message: %m"); return 0; } r = link_update(link, message); if (r < 0) { log_link_warning_errno(link, r, "Could not process link message: %m"); link_enter_failed(link); return 0; } if (link->manager->test_mode) { log_link_debug(link, "Running in test mode, refusing to enter initialized state."); link_set_state(link, LINK_STATE_UNMANAGED); return 0; } /* Do not enter initialized state if we are enumerating. */ if (manager->enumerating) return 0; r = link_check_initialized(link); if (r < 0) { log_link_warning_errno(link, r, "Failed to check link is initialized: %m"); link_enter_failed(link); return 0; } } else { r = link_update(link, message); if (r < 0) { log_link_warning_errno(link, r, "Could not process link message: %m"); link_enter_failed(link); return 0; } if (r == 0) return 0; if (link->manager->test_mode) { log_link_debug(link, "Running in test mode, refusing to configure interface."); link_set_state(link, LINK_STATE_UNMANAGED); return 0; } /* Do not configure interface if we are enumerating. */ if (manager->enumerating) return 0; r = link_reconfigure_impl(link, /* flags = */ 0); if (r < 0) { log_link_warning_errno(link, r, "Failed to reconfigure interface: %m"); link_enter_failed(link); return 0; } } break; case RTM_DELLINK: link_drop(link); netdev_drop(netdev); break; default: assert_not_reached(); } return 1; } int link_getlink_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, const char *error_msg) { uint16_t message_type; int r; assert(m); assert(link); assert(error_msg); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 0; r = sd_netlink_message_get_errno(m); if (r < 0) { log_link_message_warning_errno(link, m, r, error_msg); link_enter_failed(link); return 0; } r = sd_netlink_message_get_type(m, &message_type); if (r < 0) { log_link_debug_errno(link, r, "rtnl: failed to read link message type, ignoring: %m"); return 0; } if (message_type != RTM_NEWLINK) { log_link_debug(link, "rtnl: received invalid link message type, ignoring."); return 0; } r = link_update(link, m); if (r < 0) { link_enter_failed(link); return 0; } return 1; } int link_call_getlink(Link *link, link_netlink_message_handler_t callback) { _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; int r; assert(link); assert(link->manager); assert(link->manager->rtnl); assert(callback); r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex); if (r < 0) return r; r = netlink_call_async(link->manager->rtnl, NULL, req, callback, link_netlink_destroy_callback, link); if (r < 0) return r; link_ref(link); return 0; } static const char* const link_state_table[_LINK_STATE_MAX] = { [LINK_STATE_PENDING] = "pending", [LINK_STATE_INITIALIZED] = "initialized", [LINK_STATE_CONFIGURING] = "configuring", [LINK_STATE_CONFIGURED] = "configured", [LINK_STATE_UNMANAGED] = "unmanaged", [LINK_STATE_FAILED] = "failed", [LINK_STATE_LINGER] = "linger", }; DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState); int link_flags_to_string_alloc(uint32_t flags, char **ret) { _cleanup_free_ char *str = NULL; static const char* map[] = { [LOG2U(IFF_UP)] = "up", /* interface is up. */ [LOG2U(IFF_BROADCAST)] = "broadcast", /* broadcast address valid. */ [LOG2U(IFF_DEBUG)] = "debug", /* turn on debugging. */ [LOG2U(IFF_LOOPBACK)] = "loopback", /* interface is a loopback net. */ [LOG2U(IFF_POINTOPOINT)] = "point-to-point", /* interface has p-p link. */ [LOG2U(IFF_NOTRAILERS)] = "no-trailers", /* avoid use of trailers. */ [LOG2U(IFF_RUNNING)] = "running", /* interface RFC2863 OPER_UP. */ [LOG2U(IFF_NOARP)] = "no-arp", /* no ARP protocol. */ [LOG2U(IFF_PROMISC)] = "promiscuous", /* receive all packets. */ [LOG2U(IFF_ALLMULTI)] = "all-multicast", /* receive all multicast packets. */ [LOG2U(IFF_MASTER)] = "master", /* master of a load balancer. */ [LOG2U(IFF_SLAVE)] = "slave", /* slave of a load balancer. */ [LOG2U(IFF_MULTICAST)] = "multicast", /* supports multicast. */ [LOG2U(IFF_PORTSEL)] = "portsel", /* can set media type. */ [LOG2U(IFF_AUTOMEDIA)] = "auto-media", /* auto media select active. */ [LOG2U(IFF_DYNAMIC)] = "dynamic", /* dialup device with changing addresses. */ [LOG2U(IFF_LOWER_UP)] = "lower-up", /* driver signals L1 up. */ [LOG2U(IFF_DORMANT)] = "dormant", /* driver signals dormant. */ [LOG2U(IFF_ECHO)] = "echo", /* echo sent packets. */ }; assert(ret); for (size_t i = 0; i < ELEMENTSOF(map); i++) if (FLAGS_SET(flags, 1 << i) && map[i]) if (!strextend_with_separator(&str, ",", map[i])) return -ENOMEM; *ret = TAKE_PTR(str); return 0; } static const char * const kernel_operstate_table[] = { [IF_OPER_UNKNOWN] = "unknown", [IF_OPER_NOTPRESENT] = "not-present", [IF_OPER_DOWN] = "down", [IF_OPER_LOWERLAYERDOWN] = "lower-layer-down", [IF_OPER_TESTING] = "testing", [IF_OPER_DORMANT] = "dormant", [IF_OPER_UP] = "up", }; DEFINE_STRING_TABLE_LOOKUP_TO_STRING(kernel_operstate, int);