/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include #include #include #include #include #include #include #include "alloc-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-identifier.h" #include "dhcp-lease-internal.h" #include "env-file.h" #include "ethtool-util.h" #include "fd-util.h" #include "fileio.h" #include "format-util.h" #include "fs-util.h" #include "ipvlan.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-can.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-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 "stat-util.h" #include "stdio-util.h" #include "string-table.h" #include "strv.h" #include "tc.h" #include "tmpfile-util.h" #include "udev-util.h" #include "util.h" #include "vrf.h" bool link_ipv4ll_enabled(Link *link) { assert(link); if (link->flags & IFF_LOOPBACK) return false; if (!link->network) return false; if (link->iftype == ARPHRD_CAN) return false; if (link->hw_addr.length != ETH_ALEN) return false; if (ether_addr_is_null(&link->hw_addr.ether)) return false; if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "ip6gre","ip6tnl", "sit", "vti", "vti6", "nlmon", "xfrm", "bareudp")) return false; /* L3 or L3S mode do not support ARP. */ if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S)) return false; if (link->network->bond) return false; return link->network->link_local & ADDRESS_FAMILY_IPV4; } bool link_ipv6ll_enabled(Link *link) { assert(link); if (!socket_ipv6_is_supported()) return false; if (link->flags & IFF_LOOPBACK) return false; if (!link->network) return false; if (link->iftype == ARPHRD_CAN) return false; if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "sit", "vti", "nlmon")) return false; if (link->network->bond) return false; return link->network->link_local & ADDRESS_FAMILY_IPV6; } bool link_ipv6_enabled(Link *link) { assert(link); if (!socket_ipv6_is_supported()) return false; if (link->network->bond) return false; if (link->iftype == ARPHRD_CAN) return false; /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */ if (link_ipv6ll_enabled(link)) return true; if (network_has_static_ipv6_configurations(link->network)) return true; return false; } bool link_is_ready_to_configure(Link *link, bool allow_unmanaged) { assert(link); if (!link->network) { if (!allow_unmanaged) return false; return link_has_carrier(link); } if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) return false; 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->stacked_netdevs_created) return false; if (!link->activated) return false; return true; } 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->lldp = sd_lldp_unref(link->lldp); link_lldp_emit_stop(link); ndisc_flush(link); 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->radv = sd_radv_unref(link->radv); } static Link *link_free(Link *link) { assert(link); link_ntp_settings_clear(link); link_dns_settings_clear(link); link->routes = set_free(link->routes); link->routes_foreign = set_free(link->routes_foreign); link->dhcp_routes = set_free(link->dhcp_routes); link->dhcp_routes_old = set_free(link->dhcp_routes_old); link->dhcp6_routes = set_free(link->dhcp6_routes); link->dhcp6_routes_old = set_free(link->dhcp6_routes_old); link->dhcp6_pd_routes = set_free(link->dhcp6_pd_routes); link->dhcp6_pd_routes_old = set_free(link->dhcp6_pd_routes_old); link->ndisc_routes = set_free(link->ndisc_routes); link->nexthops = set_free(link->nexthops); link->nexthops_foreign = set_free(link->nexthops_foreign); link->neighbors = set_free(link->neighbors); link->neighbors_foreign = set_free(link->neighbors_foreign); link->addresses = set_free(link->addresses); link->addresses_foreign = set_free(link->addresses_foreign); link->addresses_ipv4acd = set_free(link->addresses_ipv4acd); link->pool_addresses = set_free(link->pool_addresses); link->static_addresses = set_free(link->static_addresses); link->dhcp6_addresses = set_free(link->dhcp6_addresses); link->dhcp6_addresses_old = set_free(link->dhcp6_addresses_old); link->dhcp6_pd_addresses = set_free(link->dhcp6_pd_addresses); link->dhcp6_pd_addresses_old = set_free(link->dhcp6_pd_addresses_old); link->ndisc_addresses = set_free(link->ndisc_addresses); link->dhcp6_pd_prefixes = set_free(link->dhcp6_pd_prefixes); link_free_engines(link); free(link->ifname); strv_free(link->alternative_names); free(link->kind); free(link->ssid); free(link->driver); unlink_and_free(link->lease_file); unlink_and_free(link->lldp_file); unlink_and_free(link->state_file); sd_device_unref(link->sd_device); hashmap_free(link->bound_to_links); hashmap_free(link->bound_by_links); set_free_with_destructor(link->slaves, link_unref); network_unref(link->network); 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); assert(ifindex > 0); 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_dhcp) { int r = 0, k; assert(link); assert(link->manager); assert(link->manager->event); bool keep_dhcp = may_keep_dhcp && link->network && !link->network->dhcp_send_decline && /* IPv4 ACD for the DHCPv4 address is running. */ (link->manager->restarting || FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP)); if (!keep_dhcp) { k = sd_dhcp_client_stop(link->dhcp_client); if (k < 0) r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m"); } k = sd_dhcp_server_stop(link->dhcp_server); if (k < 0) r = log_link_warning_errno(link, k, "Could not stop DHCPv4 server: %m"); k = sd_lldp_stop(link->lldp); if (k < 0) r = log_link_warning_errno(link, k, "Could not stop LLDP: %m"); k = sd_ipv4ll_stop(link->ipv4ll); if (k < 0) r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m"); k = ipv4acd_stop(link); if (k < 0) r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client: %m"); k = sd_dhcp6_client_stop(link->dhcp6_client); if (k < 0) r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m"); k = dhcp6_pd_remove(link); if (k < 0) r = log_link_warning_errno(link, k, "Could not remove DHCPv6 PD addresses and routes: %m"); k = sd_ndisc_stop(link->ndisc); if (k < 0) r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m"); k = sd_radv_stop(link->radv); if (k < 0) r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m"); link_lldp_emit_stop(link); return r; } 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); (void) link_stop_engines(link, 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. */ link_set_state(link, LINK_STATE_CONFIGURED); return; } if (!link->static_addresses_configured) return (void) log_link_debug(link, "%s(): static addresses are not configured.", __func__); SET_FOREACH(a, link->addresses) if (!address_is_ready(a)) { _cleanup_free_ char *str = NULL; (void) in_addr_prefix_to_string(a->family, &a->in_addr, a->prefixlen, &str); return (void) log_link_debug(link, "%s(): an address %s is not ready.", __func__, strna(str)); } 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__); bool has_ndisc_address = false; NDiscAddress *n; SET_FOREACH(n, link->ndisc_addresses) if (!n->marked) { has_ndisc_address = true; break; } if ((link_dhcp4_enabled(link) || link_dhcp6_with_address_enabled(link) || link_ipv4ll_enabled(link)) && !link->dhcp_address && set_isempty(link->dhcp6_addresses) && !has_ndisc_address && !link->ipv4ll_address_configured) /* When DHCP[46] or IPv4LL is enabled, at least one address is acquired by them. */ return (void) log_link_debug(link, "%s(): DHCP4, DHCP6 or IPv4LL is enabled but no dynamic address is assigned yet.", __func__); /* Ignore NDisc when ConfigureWithoutCarrier= is enabled, as IPv6AcceptRA= is enabled by default. */ if (link_dhcp4_enabled(link) || link_dhcp6_enabled(link) || link_dhcp6_pd_is_enabled(link) || (!link->network->configure_without_carrier && link_ipv6_accept_ra_enabled(link)) || link_ipv4ll_enabled(link)) { if (!link->dhcp4_configured && !(link->dhcp6_address_configured && link->dhcp6_route_configured) && !(link->dhcp6_pd_address_configured && link->dhcp6_pd_route_configured) && !(link->ndisc_addresses_configured && link->ndisc_routes_configured) && !link->ipv4ll_address_configured) /* When DHCP[46], NDisc, or IPv4LL is enabled, at least one protocol must be finished. */ return (void) log_link_debug(link, "%s(): dynamic addresses or routes are not configured.", __func__); log_link_debug(link, "%s(): dhcp4:%s ipv4ll:%s dhcp6_addresses:%s dhcp6_routes:%s " "dhcp6_pd_addresses:%s dhcp6_pd_routes:%s ndisc_addresses:%s ndisc_routes:%s", __func__, yes_no(link->dhcp4_configured), yes_no(link->ipv4ll_address_configured), yes_no(link->dhcp6_address_configured), yes_no(link->dhcp6_route_configured), yes_no(link->dhcp6_pd_address_configured), yes_no(link->dhcp6_pd_route_configured), yes_no(link->ndisc_addresses_configured), yes_no(link->ndisc_routes_configured)); } 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; } static int link_request_stacked_netdevs(Link *link) { NetDev *netdev; int r; assert(link); link->stacked_netdevs_created = false; link->stacked_netdevs_after_configured_created = false; HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) { r = link_request_to_crate_stacked_netdev(link, netdev); if (r < 0) return r; } if (link->create_stacked_netdev_messages == 0) link->stacked_netdevs_created = true; if (link->create_stacked_netdev_after_configured_messages == 0) link->stacked_netdevs_after_configured_created = true; return 0; } static int link_acquire_dynamic_ipv6_conf(Link *link) { int r; assert(link); if (link->radv) { assert(link->radv); assert(in6_addr_is_link_local(&link->ipv6ll_address)); log_link_debug(link, "Starting IPv6 Router Advertisements"); r = sd_radv_start(link->radv); if (r < 0) return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %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"); r = dhcp6_request_prefix_delegation(link); if (r < 0) return log_link_warning_errno(link, r, "Failed to request DHCPv6 prefix delegation: %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"); } else if (link->ipv4ll) { log_link_debug(link, "Acquiring IPv4 link-local address"); r = sd_ipv4ll_start(link->ipv4ll); if (r < 0) return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m"); } if (link->dhcp_server) { r = sd_dhcp_server_start(link->dhcp_server); 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); 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; } r = link_lldp_emit_start(link); if (r < 0) return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m"); return 0; } int link_ipv6ll_gained(Link *link, const struct in6_addr *address) { int r; assert(link); log_link_info(link, "Gained IPv6LL"); link->ipv6ll_address = *address; link_check_ready(link); if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) { r = link_acquire_dynamic_ipv6_conf(link); if (r < 0) { link_enter_failed(link); return r; } } 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. */ if (hashmap_isempty(link->bound_by_links)) return 0; 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 int link_new_carrier_maps(Link *link) { int r; r = link_new_bound_by_list(link); if (r < 0) return r; r = link_handle_bound_by_list(link); if (r < 0) return r; r = link_new_bound_to_list(link); if (r < 0) return r; return link_handle_bound_to_list(link); } 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 void link_free_carrier_maps(Link *link) { assert(link); link_free_bound_to_list(link); link_free_bound_by_list(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 void link_drop_requests(Link *link) { Request *req; assert(link); assert(link->manager); ORDERED_SET_FOREACH(req, link->manager->request_queue) if (req->link == link) request_drop(req); } static Link *link_drop(Link *link) { char **n; 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. */ link_drop_requests(link); link_free_carrier_maps(link); link_drop_from_master(link); link_unref(set_remove(link->manager->links_requesting_uuid, link)); (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. */ if (hashmap_get(link->manager->links_by_hw_addr, &link->hw_addr) == link) hashmap_remove(link->manager->links_by_hw_addr, &link->hw_addr); /* 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_foreign_config(Link *link) { int k, r; assert(link); assert(link->manager); r = link_drop_foreign_routes(link); k = link_drop_foreign_nexthops(link); if (k < 0 && r >= 0) r = k; k = link_drop_foreign_addresses(link); if (k < 0 && r >= 0) r = k; k = link_drop_foreign_neighbors(link); if (k < 0 && r >= 0) r = k; k = manager_drop_foreign_routing_policy_rules(link->manager); if (k < 0 && r >= 0) r = k; return r; } static int link_drop_config(Link *link) { int k, r; assert(link); assert(link->manager); r = link_drop_routes(link); k = link_drop_nexthops(link); if (k < 0 && r >= 0) r = k; k = link_drop_addresses(link); if (k < 0 && r >= 0) r = k; k = link_drop_neighbors(link); if (k < 0 && r >= 0) r = k; k = manager_drop_routing_policy_rules(link->manager, link); if (k < 0 && r >= 0) r = k; ndisc_flush(link); 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_configure_traffic_control(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_configure_sr_iov(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_flags(link); if (r < 0) return r; r = link_request_to_set_group(link); if (r < 0) return r; r = link_configure_mtu(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); 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 = dhcp4_configure(link); if (r < 0) return r; r = dhcp6_configure(link); if (r < 0) return r; r = ndisc_configure(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; /* Drop foreign config, but ignore loopback or critical devices. * We do not want to remove loopback address or addresses used for root NFS. */ if (!(link->flags & IFF_LOOPBACK) && link->network->keep_configuration != KEEP_CONFIGURATION_YES) { r = link_drop_foreign_config(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->sd_device, &link->hw_addr.ether, &link->permanent_mac, link->driver, link->iftype, 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->sd_device) { uint8_t name_assign_type = NET_NAME_UNKNOWN; const char *attr; if (sd_device_get_sysattr_value(link->sd_device, "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 '%s'%s.", network->filename, warn ? ", based on potentially unpredictable interface name" : ""); if (network->unmanaged) return -ENOENT; *ret = network; return 0; } return -ENOENT; } static int link_reconfigure_impl(Link *link, bool force) { Network *network; int r; assert(link); r = link_get_network(link, &network); if (r == -ENOENT) { link_set_state(link, LINK_STATE_UNMANAGED); return 0; } if (r < 0) return r; if (link->network == network && !force) return 0; log_link_info(link, "Re-configuring with %s", network->filename); /* Dropping old .network file */ r = link_stop_engines(link, false); if (r < 0) return r; link_drop_requests(link); r = link_drop_config(link); if (r < 0) return r; if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) { log_link_debug(link, "State is %s, dropping foreign config", link_state_to_string(link->state)); r = link_drop_foreign_config(link); if (r < 0) return r; } link_free_carrier_maps(link); link_free_engines(link); link->network = network_unref(link->network); link_unref(set_remove(link->manager->links_requesting_uuid, link)); /* Then, apply new .network file */ link->network = network_ref(network); link_update_operstate(link, true); link_dirty(link); r = link_new_carrier_maps(link); if (r < 0) return r; link_set_state(link, LINK_STATE_INITIALIZED); link->activated = false; r = link_configure(link); if (r < 0) return r; return 1; } static int link_reconfigure_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, bool force) { 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, force); if (r < 0) link_enter_failed(link); return 0; } static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { return link_reconfigure_handler_internal(rtnl, m, link, false); } static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { return link_reconfigure_handler_internal(rtnl, m, link, true); } int link_reconfigure(Link *link, bool force) { int r; /* When link in pending or initialized state, then link_configure() will be called. To prevent * the function from being called multiple times simultaneously, refuse to reconfigure the * interface in these cases. */ if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER)) return 0; /* 0 means no-op. */ r = link_call_getlink(link, force ? link_force_reconfigure_handler : link_reconfigure_handler); if (r < 0) return r; return 1; /* 1 means the interface will be reconfigured. */ } static int link_initialized_and_synced(Link *link) { Network *network; int r; assert(link); assert(link->ifname); assert(link->manager); /* We may get called either from the asynchronous netlink callback, * or directly from link_check_initialized() if running in a container. */ if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) return 0; 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; if (!link->network) { r = wifi_get_info(link); if (r < 0) return r; r = link_get_network(link, &network); if (r == -ENOENT) { link_set_state(link, LINK_STATE_UNMANAGED); return 0; } if (r < 0) return r; if (link->flags & IFF_LOOPBACK) { if (network->link_local != ADDRESS_FAMILY_NO) log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link"); if (network->dhcp != ADDRESS_FAMILY_NO) log_link_debug(link, "Ignoring DHCP clients for loopback link"); if (network->dhcp_server) log_link_debug(link, "Ignoring DHCP server for loopback link"); } link->network = network_ref(network); link_update_operstate(link, false); link_dirty(link); } r = link_new_bound_to_list(link); if (r < 0) return r; return link_configure(link); } 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) { assert(link); assert(device); if (link->state != LINK_STATE_PENDING) return 0; if (link->sd_device) return 0; log_link_debug(link, "udev initialized link"); link_set_state(link, LINK_STATE_INITIALIZED); link->sd_device = sd_device_ref(device); /* 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); } static int link_check_initialized(Link *link) { _cleanup_(sd_device_unrefp) sd_device *device = NULL; int r; assert(link); if (path_is_read_only_fs("/sys") > 0) /* no udev */ 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 = sd_device_get_is_initialized(device); if (r < 0) return log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %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(sd_device_monitor *monitor, sd_device *device, void *userdata) { sd_device_action_t action; Manager *m = userdata; Link *link = NULL; int r, ifindex; assert(m); assert(device); r = sd_device_get_action(device, &action); if (r < 0) { log_device_debug_errno(device, r, "Failed to get udev action, ignoring device: %m"); return 0; } /* Ignore the "remove" uevent — let's remove a device only if rtnetlink says so. All other uevents * are "positive" events in some form, i.e. inform us about a changed or new network interface, that * still exists — and we are interested in that. */ if (action == SD_DEVICE_REMOVE) return 0; r = sd_device_get_ifindex(device, &ifindex); if (r < 0) { log_device_debug_errno(device, r, "Ignoring udev %s event for device without ifindex or with invalid ifindex: %m", device_action_to_string(action)); return 0; } r = device_is_renaming(device); if (r < 0) { log_device_debug_errno(device, r, "Failed to determine the device is renamed or not, ignoring '%s' uevent: %m", device_action_to_string(action)); return 0; } if (r > 0) { log_device_debug(device, "Interface is under renaming, wait for the interface to be renamed."); return 0; } r = link_get_by_index(m, ifindex, &link); if (r < 0) { log_device_debug_errno(device, r, "Failed to get link from ifindex %i, ignoring: %m", ifindex); return 0; } r = link_initialized(link, device); if (r < 0) link_enter_failed(link); return 0; } static int link_carrier_gained(Link *link) { int r; assert(link); r = link_handle_bound_by_list(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. */ 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(Link *link) { int r; assert(link); r = link_handle_bound_by_list(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. */ return 0; if (link->network && link->network->ignore_carrier_loss) return 0; r = link_stop_engines(link, false); if (r < 0) { link_enter_failed(link); return r; } r = link_drop_config(link); if (r < 0) return r; if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) { log_link_debug(link, "State is %s, dropping foreign config", link_state_to_string(link->state)); r = link_drop_foreign_config(link); if (r < 0) return r; } return 0; } int link_carrier_reset(Link *link) { int r; assert(link); if (!link_has_carrier(link)) return 0; r = link_carrier_lost(link); if (r < 0) return r; r = link_carrier_gained(link); if (r < 0) return r; log_link_info(link, "Reset carrier"); return 0; } static int link_admin_state_up(Link *link) { int r; 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, "ActivationPolicy is \"always-off\", 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. */ r = link_set_ipv6_mtu(link); if (r < 0) log_link_warning_errno(link, r, "Cannot set IPv6 MTU, ignoring: %m"); return 0; } static int link_admin_state_down(Link *link) { assert(link); if (!link->network) return 0; if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) { log_link_info(link, "ActivationPolicy is \"always-on\", forcing link up."); return link_request_to_bring_up_or_down(link, /* up = */ true); } return 0; } bool link_has_carrier(Link *link) { /* see Documentation/networking/operstates.txt in the kernel sources */ if (link->kernel_operstate == IF_OPER_UP) return true; if (link->kernel_operstate == IF_OPER_UNKNOWN) /* operstate may not be implemented, so fall back to flags */ if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) && !FLAGS_SET(link->flags, IFF_DORMANT)) return true; return false; } static bool link_is_enslaved(Link *link) { if (link->flags & IFF_SLAVE) /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */ return true; if (!link->network) return false; if (link->master_ifindex > 0 && link->network->bridge) return true; /* TODO: add conditions for other netdevs. */ return false; } static LinkAddressState address_state_from_scope(uint8_t scope) { if (scope < RT_SCOPE_SITE) /* universally accessible addresses found */ return LINK_ADDRESS_STATE_ROUTABLE; if (scope < RT_SCOPE_HOST) /* only link or site local addresses found */ return LINK_ADDRESS_STATE_DEGRADED; /* no useful addresses found */ return LINK_ADDRESS_STATE_OFF; } 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; uint8_t ipv4_scope = RT_SCOPE_NOWHERE, ipv6_scope = RT_SCOPE_NOWHERE; bool changed = false; Address *address; 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; } } SET_FOREACH(address, link->addresses) { if (!address_is_ready(address)) continue; if (address->family == AF_INET) ipv4_scope = MIN(ipv4_scope, address->scope); if (address->family == AF_INET6) ipv6_scope = MIN(ipv6_scope, address->scope); } /* for operstate we also take foreign addresses into account */ SET_FOREACH(address, link->addresses_foreign) { if (!address_is_ready(address)) continue; if (address->family == AF_INET) ipv4_scope = MIN(ipv4_scope, address->scope); if (address->family == AF_INET6) ipv6_scope = MIN(ipv6_scope, address->scope); } ipv4_address_state = address_state_from_scope(ipv4_scope); ipv6_address_state = address_state_from_scope(ipv6_scope); address_state = address_state_from_scope(MIN(ipv4_scope, ipv6_scope)); /* 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-carrier | degraded | enslaved * routable | off | no-carrier | dormant | degraded-carrier | routable | routable */ 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; /* 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 (operstate < link->network->required_operstate_for_online.min || operstate > link->network->required_operstate_for_online.max) online_state = LINK_ONLINE_STATE_OFFLINE; else { AddressFamily required_family = link->network->required_family_for_online; 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 (link->network->required_operstate_for_online.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 (link->network->required_operstate_for_online.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_lower_up, 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_lower_up = link->flags & IFF_LOWER_UP; 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_lower_up && (link->flags & IFF_LOWER_UP)) { r = wifi_get_info(link); if (r < 0) return r; if (r > 0) { /* All link information is up-to-date. So, it is not necessary to call * RTM_GETLINK netlink method again. */ r = link_reconfigure_impl(link, /* force = */ false); if (r < 0) return r; } } 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; } r = link_update_lldp(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->master_ifindex) return 0; if (link->master_ifindex == 0) log_link_debug(link, "Joined to master interface: %i", master_ifindex); else if (master_ifindex == 0) log_link_debug(link, "Leaved from master interface: %i", link->master_ifindex); else log_link_debug(link, "Master interface is changed: %i → %i", link->master_ifindex, 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_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 (hw_addr_is_null(&link->hw_addr)) log_link_debug(link, "Saved hardware address: %s", HW_ADDR_TO_STR(&addr)); else { log_link_debug(link, "Hardware address is changed: %s → %s", HW_ADDR_TO_STR(&link->hw_addr), HW_ADDR_TO_STR(&addr)); if (hashmap_get(link->manager->links_by_hw_addr, &link->hw_addr) == link) hashmap_remove(link->manager->links_by_hw_addr, &link->hw_addr); } 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 = ipv4ll_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) { 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) { r = sd_lldp_set_filter_address(link->lldp, &link->hw_addr.ether); if (r < 0) return log_link_debug_errno(link, r, "Could not update MAC address for LLDP: %m"); } return 0; } 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" → %"PRIu32" (min: %"PRIu32", max: %"PRIu32")", link->mtu, mtu, link->min_mtu, link->max_mtu); link->mtu = mtu; 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; char **n; int r; assert(link); assert(message); r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &altnames); if (r < 0 && r != -ENODATA) return log_link_debug_errno(link, r, "rtnl: failed to read alternative names: %m"); 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 0; } static int link_update_name(Link *link, sd_netlink_message *message) { char ifname_from_index[IF_NAMESIZE + 1]; 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; if (!format_ifname(link->ifindex, ifname_from_index)) return log_link_debug_errno(link, SYNTHETIC_ERRNO(ENXIO), "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 DHCP6 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) { r = sd_lldp_set_ifname(link->lldp, link->ifname); if (r < 0) return log_link_debug_errno(link, r, "Failed to update interface name in LLDP: %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"); } Address *a; SET_FOREACH(a, link->addresses_ipv4acd) { r = sd_ipv4acd_set_ifname(a->acd, link->ifname); if (r < 0) return log_link_debug_errno(link, r, "Failed to update interface name in IPv4ACD client: %m"); } return 0; } static int link_update(Link *link, sd_netlink_message *message) { int r; assert(link); assert(message); r = link_update_name(link, message); if (r < 0) return r; r = link_update_alternative_names(link, message); if (r < 0) return r; r = link_update_mtu(link, message); if (r < 0) return r; r = link_update_hardware_address(link, message); if (r < 0) return r; r = link_update_master(link, message); if (r < 0) return r; return link_update_flags(link, message); } 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, *lldp_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 (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(); if (asprintf(&lldp_file, "/run/systemd/netif/lldp/%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, .ifindex = ifindex, .iftype = iftype, .ifname = TAKE_PTR(ifname), .kind = TAKE_PTR(kind), .state_file = TAKE_PTR(state_file), .lease_file = TAKE_PTR(lease_file), .lldp_file = TAKE_PTR(lldp_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"); r = ethtool_get_permanent_macaddr(&manager->ethtool_fd, link->ifname, &link->permanent_mac); if (r < 0) log_link_debug_errno(link, r, "Permanent MAC address not found for new device, continuing without: %m"); r = ethtool_get_driver(&manager->ethtool_fd, link->ifname, &link->driver); if (r < 0) log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m"); log_link_debug(link, "Link %d added", link->ifindex); *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_warning_errno(r, "Could not process new link message for netdev, ignoring: %m"); 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_warning_errno(r, "Could not process link message: %m"); link_enter_failed(link); return 0; } r = link_check_initialized(link); if (r < 0) { log_warning_errno(r, "Failed to check link is initialized: %m"); link_enter_failed(link); return 0; } } else { r = link_update(link, message); if (r < 0) { log_warning_errno(r, "Could not process link message: %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);