/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include #include #include #include #include "alloc-util.h" #include "bond.h" #include "bridge.h" #include "bus-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 "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-can.h" #include "networkd-dhcp-server.h" #include "networkd-dhcp4.h" #include "networkd-dhcp6.h" #include "networkd-fdb.h" #include "networkd-ipv4ll.h" #include "networkd-link-bus.h" #include "networkd-link.h" #include "networkd-lldp-tx.h" #include "networkd-manager.h" #include "networkd-mdb.h" #include "networkd-ndisc.h" #include "networkd-neighbor.h" #include "networkd-nexthop.h" #include "networkd-sriov.h" #include "networkd-sysctl.h" #include "networkd-radv.h" #include "networkd-routing-policy-rule.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 "sysctl-util.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 (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; } 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 void link_update_master_operstate(Link *link, NetDev *netdev) { Link *master; if (!netdev) return; if (netdev->ifindex <= 0) return; if (link_get(link->manager, netdev->ifindex, &master) < 0) return; link_update_operstate(master, true); } void link_update_operstate(Link *link, bool also_update_master) { LinkOperationalState operstate; LinkCarrierState carrier_state; LinkAddressState address_state; _cleanup_strv_free_ char **p = NULL; uint8_t 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->scope < scope) 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->scope < scope) scope = address->scope; } if (scope < RT_SCOPE_SITE) /* universally accessible addresses found */ address_state = LINK_ADDRESS_STATE_ROUTABLE; else if (scope < RT_SCOPE_HOST) /* only link or site local addresses found */ address_state = LINK_ADDRESS_STATE_DEGRADED; else /* no useful addresses found */ address_state = LINK_ADDRESS_STATE_OFF; /* 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; 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->operstate != operstate) { link->operstate = operstate; changed = true; if (strv_extend(&p, "OperationalState") < 0) log_oom(); } if (p) link_send_changed_strv(link, p); if (changed) link_dirty(link); if (also_update_master && link->network) { link_update_master_operstate(link, link->network->bond); link_update_master_operstate(link, link->network->bridge); } } #define FLAG_STRING(string, flag, old, new) \ (((old ^ new) & flag) \ ? ((old & flag) ? (" -" string) : (" +" string)) \ : "") static int link_update_flags(Link *link, sd_netlink_message *m, bool force_update_operstate) { unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags; uint8_t operstate; int r; assert(link); r = sd_rtnl_message_link_get_flags(m, &flags); if (r < 0) return log_link_warning_errno(link, r, "Could not get link flags: %m"); r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate); if (r < 0) /* if we got a message without operstate, take it to mean the state was unchanged */ operstate = link->kernel_operstate; if (!force_update_operstate && (link->flags == flags) && (link->kernel_operstate == operstate)) return 0; if (link->flags != flags) { 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); /* link flags are currently at most 18 bits, let's align to * printing 20 */ if (unknown_flags_added) log_link_debug(link, "Unknown link flags gained: %#.5x (ignoring)", unknown_flags_added); if (unknown_flags_removed) log_link_debug(link, "Unknown link flags lost: %#.5x (ignoring)", unknown_flags_removed); } link->flags = flags; link->kernel_operstate = operstate; link_update_operstate(link, true); return 0; } static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) { _cleanup_(link_unrefp) Link *link = NULL; const char *ifname, *kind = NULL; unsigned short iftype; int r, ifindex; uint16_t type; assert(manager); assert(message); assert(ret); /* check for link kind */ r = sd_netlink_message_enter_container(message, IFLA_LINKINFO); if (r == 0) { (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind); r = sd_netlink_message_exit_container(message); if (r < 0) return r; } r = sd_netlink_message_get_type(message, &type); if (r < 0) return r; else if (type != RTM_NEWLINK) return -EINVAL; r = sd_rtnl_message_link_get_ifindex(message, &ifindex); if (r < 0) return r; else if (ifindex <= 0) return -EINVAL; r = sd_rtnl_message_link_get_type(message, &iftype); if (r < 0) return r; r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname); if (r < 0) return r; link = new(Link, 1); if (!link) return -ENOMEM; *link = (Link) { .n_ref = 1, .manager = manager, .state = LINK_STATE_PENDING, .ifindex = ifindex, .iftype = iftype, .n_dns = (unsigned) -1, .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, }; link->ifname = strdup(ifname); if (!link->ifname) return -ENOMEM; if (kind) { link->kind = strdup(kind); if (!link->kind) return -ENOMEM; } r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex); if (r < 0) log_link_debug_errno(link, r, "New device has no master, continuing without"); r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &link->hw_addr); if (r < 0) log_link_debug_errno(link, r, "Hardware address not found for new device, continuing without"); r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr); if (r < 0) log_link_debug_errno(link, r, "Broadcast address not found for new device, continuing without"); 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"); r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &link->alternative_names); if (r < 0 && r != -ENODATA) return r; if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0) return -ENOMEM; if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0) return -ENOMEM; if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0) return -ENOMEM; r = hashmap_ensure_put(&manager->links, NULL, INT_TO_PTR(link->ifindex), link); if (r < 0) return r; r = link_update_flags(link, message, false); if (r < 0) return r; *ret = TAKE_PTR(link); return 0; } void link_ntp_settings_clear(Link *link) { link->ntp = strv_free(link->ntp); } void link_dns_settings_clear(Link *link) { if (link->n_dns != (unsigned) -1) for (unsigned i = 0; i < link->n_dns; i++) in_addr_full_free(link->dns[i]); link->dns = mfree(link->dns); link->n_dns = (unsigned) -1; link->search_domains = ordered_set_free_free(link->search_domains); link->route_domains = ordered_set_free_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->dhcp_acd = sd_ipv4acd_unref(link->dhcp_acd); 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); ipv4_dad_unref(link); } 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->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_free_engines(link); free(link->lease_file); free(link->lldp_file); free(link->ifname); strv_free(link->alternative_names); free(link->kind); free(link->ssid); free(link->driver); (void) unlink(link->state_file); 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(Manager *m, int ifindex, Link **ret) { Link *link; assert(m); assert(ifindex > 0); assert(ret); link = hashmap_get(m->links, INT_TO_PTR(ifindex)); if (!link) return -ENODEV; *ret = link; return 0; } 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); } static void link_enter_unmanaged(Link *link) { assert(link); link_set_state(link, LINK_STATE_UNMANAGED); } 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->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_ipv4acd_stop(link->dhcp_acd); if (k < 0) r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client for DHCPv4: %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 = ipv4_dad_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); } static int link_join_netdevs_after_configured(Link *link) { NetDev *netdev; int r; HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) { if (netdev->ifindex > 0) /* Assume already enslaved. */ continue; if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED) continue; log_struct(LOG_DEBUG, LOG_LINK_INTERFACE(link), LOG_NETDEV_INTERFACE(netdev), LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname)); r = netdev_join(netdev, link, NULL); if (r < 0) return log_struct_errno(LOG_WARNING, r, LOG_LINK_INTERFACE(link), LOG_NETDEV_INTERFACE(netdev), LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname)); } return 0; } static void link_enter_configured(Link *link) { assert(link); assert(link->network); if (link->state != LINK_STATE_CONFIGURING) return; link_set_state(link, LINK_STATE_CONFIGURED); (void) link_join_netdevs_after_configured(link); } 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; if (!link->addresses_configured) return (void) log_link_debug(link, "%s(): static addresses are not configured.", __func__); if (!link->neighbors_configured) return (void) log_link_debug(link, "%s(): static neighbors 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_routes_configured) return (void) log_link_debug(link, "%s(): static routes are not configured.", __func__); if (!link->static_nexthops_configured) return (void) log_link_debug(link, "%s(): static nexthops are not configured.", __func__); if (!link->routing_policy_rules_configured) return (void) log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__); if (!link->tc_configured) return (void) log_link_debug(link, "%s(): traffic controls are not configured.", __func__); if (!link->sr_iov_configured) return (void) log_link_debug(link, "%s(): SR-IOV is not configured.", __func__); if (!link->bridge_mdb_configured) return (void) log_link_debug(link, "%s(): Bridge MDB is not configured.", __func__); if (link_has_carrier(link) || !link->network->configure_without_carrier) { bool has_ndisc_address = false; NDiscAddress *n; if (link_ipv6ll_enabled(link) && !in6_addr_is_set(&link->ipv6ll_address)) return (void) log_link_debug(link, "%s(): IPv6LL is not configured yet.", __func__); SET_FOREACH(n, link->ndisc_addresses) if (!n->marked) { has_ndisc_address = true; break; } if ((link_dhcp4_enabled(link) || link_dhcp6_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__); if (link_dhcp4_enabled(link) || link_dhcp6_enabled(link) || link_dhcp6_pd_is_enabled(link) || 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 dhcp_routes:%s dhcp_pd_addresses:%s dhcp_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_enter_configured(link); } static int link_set_static_configs(Link *link) { int r; assert(link); assert(link->network); assert(link->state != _LINK_STATE_INVALID); /* Reset all *_configured flags we are configuring. */ link->request_static_addresses = false; link->addresses_configured = false; link->addresses_ready = false; link->neighbors_configured = false; link->static_routes_configured = false; link->static_nexthops_configured = false; link->routing_policy_rules_configured = false; r = link_set_bridge_fdb(link); if (r < 0) return r; r = link_set_bridge_mdb(link); if (r < 0) return r; r = link_set_neighbors(link); if (r < 0) return r; r = link_set_addresses(link); if (r < 0) return r; r = link_set_address_labels(link); if (r < 0) return r; /* now that we can figure out a default address for the dhcp server, start it */ r = dhcp4_server_configure(link); if (r < 0) return r; return 0; } static int link_configure_continue(Link *link); static int link_mac_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { int r; assert(link); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_netlink_message_get_errno(m); if (r < 0) log_link_message_warning_errno(link, m, r, "Could not set MAC address, ignoring"); else log_link_debug(link, "Setting MAC address done."); return 1; } static int link_set_mac(Link *link) { _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; int r; assert(link); assert(link->network); assert(link->manager); assert(link->manager->rtnl); if (!link->network->mac) return 0; log_link_debug(link, "Setting MAC address"); r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex); if (r < 0) return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m"); r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac); if (r < 0) return log_link_error_errno(link, r, "Could not set MAC address: %m"); r = netlink_call_async(link->manager->rtnl, NULL, req, link_mac_handler, link_netlink_destroy_callback, link); if (r < 0) return log_link_error_errno(link, r, "Could not send rtnetlink message: %m"); link_ref(link); return 0; } static int link_nomaster_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { int r; assert(link); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_netlink_message_get_errno(m); if (r < 0) log_link_message_warning_errno(link, m, r, "Could not set nomaster, ignoring"); else log_link_debug(link, "Setting nomaster done."); return 1; } static int link_set_nomaster(Link *link) { _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; int r; assert(link); assert(link->network); assert(link->manager); assert(link->manager->rtnl); /* set it free if not enslaved with networkd */ if (link->network->bridge || link->network->bond || link->network->vrf) return 0; log_link_debug(link, "Setting nomaster"); r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex); if (r < 0) return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m"); r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0); if (r < 0) return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m"); r = netlink_call_async(link->manager->rtnl, NULL, req, link_nomaster_handler, link_netlink_destroy_callback, link); if (r < 0) return log_link_error_errno(link, r, "Could not send rtnetlink message: %m"); link_ref(link); return 0; } static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { int r; assert(m); assert(link); assert(link->ifname); link->setting_mtu = false; if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_netlink_message_get_errno(m); if (r < 0) log_link_message_warning_errno(link, m, r, "Could not set MTU, ignoring"); else log_link_debug(link, "Setting MTU done."); if (link->state == LINK_STATE_INITIALIZED) { r = link_configure_continue(link); if (r < 0) link_enter_failed(link); } return 1; } int link_set_mtu(Link *link, uint32_t mtu) { _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; int r; assert(link); assert(link->manager); assert(link->manager->rtnl); if (mtu == 0 || link->setting_mtu) return 0; if (link->mtu == mtu) return 0; log_link_debug(link, "Setting MTU: %" PRIu32, mtu); r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex); if (r < 0) return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m"); /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */ if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) { log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as " "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes"); mtu = IPV6_MIN_MTU; } r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu); if (r < 0) return log_link_error_errno(link, r, "Could not append MTU: %m"); r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler, link_netlink_destroy_callback, link); if (r < 0) return log_link_error_errno(link, r, "Could not send rtnetlink message: %m"); link_ref(link); link->setting_mtu = true; return 0; } static bool link_reduces_vlan_mtu(Link *link) { /* See netif_reduces_vlan_mtu() in kernel. */ return streq_ptr(link->kind, "macsec"); } static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) { uint32_t mtu = 0; NetDev *dev; HASHMAP_FOREACH(dev, link->network->stacked_netdevs) if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0) /* See vlan_dev_change_mtu() in kernel. */ mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu); else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu) /* See macvlan_change_mtu() in kernel. */ mtu = dev->mtu; return mtu; } static int link_configure_mtu(Link *link) { uint32_t mtu; assert(link); assert(link->network); if (link->network->mtu > 0) return link_set_mtu(link, link->network->mtu); mtu = link_get_requested_mtu_by_stacked_netdevs(link); if (link->mtu >= mtu) return 0; log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. " "If it is not desired, then please explicitly specify MTUBytes= setting.", link->mtu, mtu); return link_set_mtu(link, mtu); } static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { int r; assert(m); assert(link); assert(link->ifname); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_netlink_message_get_errno(m); if (r < 0) log_link_message_warning_errno(link, m, r, "Could not set link flags, ignoring"); return 1; } static int link_set_flags(Link *link) { _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; unsigned ifi_change = 0; unsigned ifi_flags = 0; int r; assert(link); assert(link->manager); assert(link->manager->rtnl); if (link->flags & IFF_LOOPBACK) return 0; if (!link->network) return 0; if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0 && link->network->promiscuous < 0) return 0; r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex); if (r < 0) return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m"); if (link->network->arp >= 0) { ifi_change |= IFF_NOARP; SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0); } if (link->network->multicast >= 0) { ifi_change |= IFF_MULTICAST; SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast); } if (link->network->allmulticast >= 0) { ifi_change |= IFF_ALLMULTI; SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast); } if (link->network->promiscuous >= 0) { ifi_change |= IFF_PROMISC; SET_FLAG(ifi_flags, IFF_PROMISC, link->network->promiscuous); } r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change); if (r < 0) return log_link_error_errno(link, r, "Could not set link flags: %m"); r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler, link_netlink_destroy_callback, link); if (r < 0) return log_link_error_errno(link, r, "Could not send rtnetlink message: %m"); link_ref(link); return 0; } static int link_acquire_ipv6_conf(Link *link) { int r; assert(link); if (link->ndisc) { log_link_debug(link, "Discovering IPv6 routers"); r = sd_ndisc_start(link->ndisc); if (r < 0 && r != -EBUSY) return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m"); } if (link->radv) { assert(link->radv); assert(in6_addr_is_link_local(&link->ipv6ll_address)); log_link_debug(link, "Starting IPv6 Router Advertisements"); r = radv_emit_dns(link); if (r < 0) return log_link_warning_errno(link, r, "Failed to configure DNS or Domains in IPv6 Router Advertisement: %m"); r = sd_radv_start(link->radv); if (r < 0 && r != -EBUSY) return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m"); } if (link_dhcp6_enabled(link) && IN_SET(link->network->dhcp6_without_ra, DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST, DHCP6_CLIENT_START_MODE_SOLICIT)) { assert(link->dhcp6_client); assert(in6_addr_is_link_local(&link->ipv6ll_address)); r = dhcp6_request_address(link, link->network->dhcp6_without_ra == DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST); if (r < 0 && r != -EBUSY) return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m"); else log_link_debug(link, "Acquiring DHCPv6 lease"); } 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_ipv4_conf(Link *link) { int r; assert(link); assert(link->manager); assert(link->manager->event); if (link->dhcp_client) { log_link_debug(link, "Acquiring DHCPv4 lease"); r = sd_dhcp_client_start(link->dhcp_client); if (r < 0) return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %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"); } return 0; } static int link_acquire_conf(Link *link) { int r; assert(link); r = link_acquire_ipv4_conf(link); if (r < 0) return r; if (in6_addr_is_set(&link->ipv6ll_address)) { r = link_acquire_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; } 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 int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { int r; assert(link); link->setting_genmode = false; if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_netlink_message_get_errno(m); if (r < 0) log_link_message_warning_errno(link, m, r, "Could not set address genmode for interface, ignoring"); else log_link_debug(link, "Setting address genmode done."); if (link->state == LINK_STATE_INITIALIZED) { r = link_configure_continue(link); if (r < 0) link_enter_failed(link); } return 1; } static int link_configure_addrgen_mode(Link *link) { _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; uint8_t ipv6ll_mode; int r; assert(link); assert(link->network); assert(link->manager); assert(link->manager->rtnl); if (!socket_ipv6_is_supported() || link->setting_genmode) return 0; log_link_debug(link, "Setting address genmode for link"); r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex); if (r < 0) return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m"); r = sd_netlink_message_open_container(req, IFLA_AF_SPEC); if (r < 0) return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m"); r = sd_netlink_message_open_container(req, AF_INET6); if (r < 0) return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m"); if (!link_ipv6ll_enabled(link)) ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE; else if (link->network->ipv6ll_address_gen_mode < 0) { r = sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL); if (r < 0) { /* The file may not exist. And even if it exists, when stable_secret is unset, * reading the file fails with EIO. */ log_link_debug_errno(link, r, "Failed to read sysctl property stable_secret: %m"); ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64; } else ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; } else ipv6ll_mode = link->network->ipv6ll_address_gen_mode; r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode); if (r < 0) return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m"); r = sd_netlink_message_close_container(req); if (r < 0) return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m"); r = sd_netlink_message_close_container(req); if (r < 0) return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m"); r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler, link_netlink_destroy_callback, link); if (r < 0) return log_link_error_errno(link, r, "Could not send rtnetlink message: %m"); link_ref(link); link->setting_genmode = true; return 0; } static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { int r; assert(link); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_netlink_message_get_errno(m); if (r < 0) /* we warn but don't fail the link, as it may be brought up later */ log_link_message_warning_errno(link, m, r, "Could not bring up interface"); return 1; } static int link_up(Link *link) { _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; int r; assert(link); assert(link->network); assert(link->manager); assert(link->manager->rtnl); log_link_debug(link, "Bringing link up"); r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex); if (r < 0) return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m"); r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP); if (r < 0) return log_link_error_errno(link, r, "Could not set link flags: %m"); r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler, link_netlink_destroy_callback, link); if (r < 0) return log_link_error_errno(link, r, "Could not send rtnetlink message: %m"); link_ref(link); return 0; } static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { int r; assert(link); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_netlink_message_get_errno(m); if (r < 0) log_link_message_warning_errno(link, m, r, "Could not bring down interface"); return 1; } int link_down(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); log_link_debug(link, "Bringing link down"); r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex); if (r < 0) return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m"); r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP); if (r < 0) return log_link_error_errno(link, r, "Could not set link flags: %m"); r = netlink_call_async(link->manager->rtnl, NULL, req, callback ?: link_down_handler, link_netlink_destroy_callback, link); if (r < 0) return log_link_error_errno(link, r, "Could not send rtnetlink message: %m"); link_ref(link); return 0; } static int link_group_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { int r; assert(link); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_netlink_message_get_errno(m); if (r < 0) log_link_message_warning_errno(link, m, r, "Could not set group for the interface"); return 1; } static int link_set_group(Link *link) { _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; int r; assert(link); assert(link->network); assert(link->manager); assert(link->manager->rtnl); if (link->network->group <= 0) return 0; log_link_debug(link, "Setting group"); r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex); if (r < 0) return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m"); r = sd_netlink_message_append_u32(req, IFLA_GROUP, link->network->group); if (r < 0) return log_link_error_errno(link, r, "Could not set link group: %m"); r = netlink_call_async(link->manager->rtnl, NULL, req, link_group_handler, link_netlink_destroy_callback, link); if (r < 0) return log_link_error_errno(link, r, "Could not send rtnetlink message: %m"); link_ref(link); return 0; } static int link_handle_bound_to_list(Link *link) { Link *l; int r; bool required_up = false; bool link_is_up = false; assert(link); 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) { r = link_down(link, NULL); if (r < 0) return r; } else if (required_up && !link_is_up) { r = link_up(link); if (r < 0) return r; } return 0; } static int link_handle_bound_by_list(Link *link) { Link *l; int r; assert(link); 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) { 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) { 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; r = link_handle_bound_to_list(link); 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); return; } 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); return; } static void link_free_carrier_maps(Link *link) { assert(link); link_free_bound_to_list(link); link_free_bound_by_list(link); return; } static int link_append_to_master(Link *link, NetDev *netdev) { Link *master; int r; assert(link); assert(netdev); r = link_get(link->manager, netdev->ifindex, &master); if (r < 0) return r; 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, NetDev *netdev) { Link *master; assert(link); if (!link->manager || !netdev) return; if (link_get(link->manager, netdev->ifindex, &master) < 0) return; link_unref(set_remove(master->slaves, link)); } static void link_detach_from_manager(Link *link) { if (!link || !link->manager) return; link_unref(set_remove(link->manager->links_requesting_uuid, link)); link_clean(link); /* The following must be called at last. */ assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link); link_unref(link); } void link_drop(Link *link) { if (!link || link->state == LINK_STATE_LINGER) return; link_set_state(link, LINK_STATE_LINGER); link_free_carrier_maps(link); if (link->network) { link_drop_from_master(link, link->network->bridge); link_drop_from_master(link, link->network->bond); } log_link_debug(link, "Link removed"); (void) unlink(link->state_file); link_detach_from_manager(link); } static int link_joined(Link *link) { int r; assert(link); assert(link->network); switch (link->network->activation_policy) { case ACTIVATION_POLICY_BOUND: r = link_handle_bound_to_list(link); if (r < 0) return r; break; case ACTIVATION_POLICY_UP: if (link->activated) break; _fallthrough_; case ACTIVATION_POLICY_ALWAYS_UP: r = link_up(link); if (r < 0) { link_enter_failed(link); return r; } break; case ACTIVATION_POLICY_DOWN: if (link->activated) break; _fallthrough_; case ACTIVATION_POLICY_ALWAYS_DOWN: r = link_down(link, NULL); if (r < 0) { link_enter_failed(link); return r; } break; default: break; } link->activated = true; if (link->network->bridge) { r = link_set_bridge(link); if (r < 0) log_link_error_errno(link, r, "Could not set bridge message: %m"); r = link_append_to_master(link, link->network->bridge); if (r < 0) log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m"); } if (link->network->bond) { r = link_set_bond(link); if (r < 0) log_link_error_errno(link, r, "Could not set bond message: %m"); r = link_append_to_master(link, link->network->bond); if (r < 0) log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m"); } r = link_set_bridge_vlan(link); if (r < 0) log_link_error_errno(link, r, "Could not set bridge vlan: %m"); /* Skip setting up addresses until it gets carrier, or it would try to set addresses twice, which is bad for non-idempotent steps. */ if (!link_has_carrier(link) && !link->network->configure_without_carrier) return 0; link_set_state(link, LINK_STATE_CONFIGURING); r = link_acquire_conf(link); if (r < 0) return r; return link_set_static_configs(link); } static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { int r; assert(link); assert(link->network); assert(link->enslaving > 0); link->enslaving--; if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_netlink_message_get_errno(m); if (r < 0 && r != -EEXIST) { log_link_message_warning_errno(link, m, r, "Could not join netdev"); link_enter_failed(link); return 1; } log_link_debug(link, "Joined netdev"); if (link->enslaving == 0) { r = link_joined(link); if (r < 0) link_enter_failed(link); } return 1; } static int link_enter_join_netdev(Link *link) { NetDev *netdev; int r; assert(link); assert(link->network); assert(link->state == LINK_STATE_INITIALIZED); link_set_state(link, LINK_STATE_CONFIGURING); link->enslaving = 0; if (link->network->bond) { if (link->network->bond->state == NETDEV_STATE_READY && link->network->bond->ifindex == link->master_ifindex) return link_joined(link); log_struct(LOG_DEBUG, LOG_LINK_INTERFACE(link), LOG_NETDEV_INTERFACE(link->network->bond), LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname)); link->enslaving++; r = netdev_join(link->network->bond, link, netdev_join_handler); if (r < 0) { log_struct_errno(LOG_WARNING, r, LOG_LINK_INTERFACE(link), LOG_NETDEV_INTERFACE(link->network->bond), LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname)); link_enter_failed(link); return r; } } if (link->network->bridge) { log_struct(LOG_DEBUG, LOG_LINK_INTERFACE(link), LOG_NETDEV_INTERFACE(link->network->bridge), LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname)); link->enslaving++; r = netdev_join(link->network->bridge, link, netdev_join_handler); if (r < 0) { log_struct_errno(LOG_WARNING, r, LOG_LINK_INTERFACE(link), LOG_NETDEV_INTERFACE(link->network->bridge), LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname)); link_enter_failed(link); return r; } } if (link->network->vrf) { log_struct(LOG_DEBUG, LOG_LINK_INTERFACE(link), LOG_NETDEV_INTERFACE(link->network->vrf), LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname)); link->enslaving++; r = netdev_join(link->network->vrf, link, netdev_join_handler); if (r < 0) { log_struct_errno(LOG_WARNING, r, LOG_LINK_INTERFACE(link), LOG_NETDEV_INTERFACE(link->network->vrf), LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname)); link_enter_failed(link); return r; } } HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) { if (netdev->ifindex > 0) /* Assume already enslaved. */ continue; if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED) continue; log_struct(LOG_DEBUG, LOG_LINK_INTERFACE(link), LOG_NETDEV_INTERFACE(netdev), LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname)); link->enslaving++; r = netdev_join(netdev, link, netdev_join_handler); if (r < 0) { log_struct_errno(LOG_WARNING, r, LOG_LINK_INTERFACE(link), LOG_NETDEV_INTERFACE(netdev), LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname)); link_enter_failed(link); return r; } } if (link->enslaving == 0) return link_joined(link); return 0; } static int link_drop_foreign_config(Link *link) { int k, r; assert(link); assert(link->manager); r = link_drop_foreign_addresses(link); k = link_drop_foreign_neighbors(link); if (k < 0 && r >= 0) r = k; k = link_drop_foreign_routes(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_addresses(link); k = link_drop_neighbors(link); if (k < 0 && r >= 0) r = k; k = link_drop_routes(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; } int link_configure(Link *link) { int r; assert(link); assert(link->network); assert(link->state == LINK_STATE_INITIALIZED); r = link_configure_traffic_control(link); if (r < 0) return r; r = link_configure_sr_iov(link); if (r < 0) return r; if (link->iftype == ARPHRD_CAN) return link_configure_can(link); r = link_set_sysctl(link); if (r < 0) return r; r = link_set_mac(link); if (r < 0) return r; r = link_set_nomaster(link); if (r < 0) return r; r = link_set_flags(link); if (r < 0) return r; r = link_set_group(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 = radv_configure(link); if (r < 0) return r; r = link_lldp_rx_configure(link); if (r < 0) return r; r = link_configure_mtu(link); if (r < 0) return r; r = link_configure_addrgen_mode(link); if (r < 0) return r; return link_configure_continue(link); } /* The configuration continues in this separate function, instead of * including this in the above link_configure() function, for two * reasons: * 1) some devices reset the link when the mtu is set, which caused * an infinite loop here in networkd; see: * https://github.com/systemd/systemd/issues/6593 * https://github.com/systemd/systemd/issues/9831 * 2) if ipv6ll is disabled, then bringing the interface up must be * delayed until after we get confirmation from the kernel that * the addr_gen_mode parameter has been set (via netlink), see: * https://github.com/systemd/systemd/issues/13882 */ static int link_configure_continue(Link *link) { int r; assert(link); assert(link->network); assert(link->state == LINK_STATE_INITIALIZED); if (link->setting_mtu || link->setting_genmode) return 0; /* 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; } /* The kernel resets ipv6 mtu after changing device mtu; * we must set this here, after we've set device mtu */ r = link_set_ipv6_mtu(link); if (r < 0) log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface, ignoring: %m"); return link_enter_join_netdev(link); } static int link_reconfigure_internal(Link *link, sd_netlink_message *m, bool force) { _cleanup_strv_free_ char **s = NULL; Network *network; int r; assert(m); r = sd_netlink_message_get_errno(m); if (r < 0) return r; r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s); if (r < 0 && r != -ENODATA) return r; strv_free_and_replace(link->alternative_names, s); r = network_get(link->manager, link->iftype, link->sd_device, link->ifname, link->alternative_names, link->driver, &link->hw_addr.addr.ether, &link->permanent_mac, link->wlan_iftype, link->ssid, &link->bssid, &network); if (r == -ENOENT) { link_enter_unmanaged(link); return 0; } else if (r == 0 && network->unmanaged) { link_enter_unmanaged(link); return 0; } else 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; 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 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_dirty(link); r = link_new_carrier_maps(link); if (r < 0) return r; link_set_state(link, LINK_STATE_INITIALIZED); link->activated = false; /* link_configure_duid() returns 0 if it requests product UUID. In that case, * link_configure() is called later asynchronously. */ r = link_configure_duid(link); if (r <= 0) return r; r = link_configure(link); if (r < 0) return r; return 0; } static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { int r; r = link_reconfigure_internal(link, m, false); if (r < 0) link_enter_failed(link); return 1; } static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { int r; r = link_reconfigure_internal(link, m, true); if (r < 0) link_enter_failed(link); return 1; } int link_reconfigure(Link *link, bool force) { _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; 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 = 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, force ? link_force_reconfigure_handler : link_reconfigure_handler, link_netlink_destroy_callback, link); if (r < 0) return r; link_ref(link); 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 for link_add() if running in a container. See link_add(). */ 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 = network_get(link->manager, link->iftype, link->sd_device, link->ifname, link->alternative_names, link->driver, &link->hw_addr.addr.ether, &link->permanent_mac, link->wlan_iftype, link->ssid, &link->bssid, &network); if (r == -ENOENT) { link_enter_unmanaged(link); return 0; } else if (r == 0 && network->unmanaged) { link_enter_unmanaged(link); return 0; } else 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_dirty(link); } r = link_new_bound_to_list(link); if (r < 0) return r; /* link_configure_duid() returns 0 if it requests product UUID. In that case, * link_configure() is called later asynchronously. */ r = link_configure_duid(link); if (r <= 0) return r; r = link_configure(link); if (r < 0) return r; return 0; } static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { _cleanup_strv_free_ char **s = NULL; int r; r = sd_netlink_message_get_errno(m); if (r < 0) { log_link_warning_errno(link, r, "Failed to wait for the interface to be initialized: %m"); link_enter_failed(link); return 0; } r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s); if (r < 0 && r != -ENODATA) { link_enter_failed(link); return 0; } strv_free_and_replace(link->alternative_names, s); r = link_initialized_and_synced(link); if (r < 0) link_enter_failed(link); return 1; } int link_initialized(Link *link, sd_device *device) { _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; int r; assert(link); assert(link->manager); assert(link->manager->rtnl); 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 */ 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, link_initialized_handler, link_netlink_destroy_callback, link); if (r < 0) return r; link_ref(link); return 0; } int link_add(Manager *m, sd_netlink_message *message, Link **ret) { _cleanup_(sd_device_unrefp) sd_device *device = NULL; char ifindex_str[2 + DECIMAL_STR_MAX(int)]; Link *link; int r; assert(m); assert(m->rtnl); assert(message); assert(ret); r = link_new(m, message, ret); if (r < 0) return r; link = *ret; log_link_debug(link, "Link %d added", link->ifindex); if (path_is_read_only_fs("/sys") <= 0) { /* udev should be around */ sprintf(ifindex_str, "n%d", link->ifindex); r = sd_device_new_from_device_id(&device, ifindex_str); if (r < 0) { log_link_warning_errno(link, r, "Could not find device, waiting for device initialization: %m"); return 0; } r = sd_device_get_is_initialized(device); if (r < 0) { log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m"); goto failed; } if (r == 0) { /* not yet ready */ log_link_debug(link, "link pending udev initialization..."); return 0; } r = device_is_renaming(device); if (r < 0) { log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m"); goto failed; } if (r > 0) { log_link_debug(link, "Interface is being renamed, pending initialization."); return 0; } r = link_initialized(link, device); if (r < 0) goto failed; } else { r = link_initialized_and_synced(link); if (r < 0) goto failed; } return 0; failed: link_enter_failed(link); return r; } 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_ipv6_conf(link); if (r < 0) { link_enter_failed(link); return r; } } return 0; } static int link_carrier_gained(Link *link) { int r; assert(link); r = wifi_get_info(link); if (r < 0) return r; if (r > 0) { r = link_reconfigure(link, false); if (r < 0) { link_enter_failed(link); return r; } } if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) { r = link_acquire_conf(link); if (r < 0) { link_enter_failed(link); return r; } link_set_state(link, LINK_STATE_CONFIGURING); r = link_set_static_configs(link); if (r < 0) return r; } r = link_handle_bound_by_list(link); if (r < 0) return r; if (!link->bridge_mdb_configured) { r = link_set_bridge_mdb(link); if (r < 0) return r; } if (streq_ptr(link->kind, "bridge")) { Link *slave; SET_FOREACH(slave, link->slaves) { if (slave->bridge_mdb_configured) continue; r = link_set_bridge_mdb(slave); if (r < 0) link_enter_failed(slave); } } return 0; } static int link_carrier_lost(Link *link) { int r; assert(link); if (link->network && link->network->ignore_carrier_loss) return 0; /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop. * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the * configuration and stop the clients as well. */ if (link->setting_mtu) 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 config", link_state_to_string(link->state)); r = link_drop_foreign_config(link); if (r < 0) return r; } r = link_handle_bound_by_list(link); if (r < 0) return r; return 0; } int link_carrier_reset(Link *link) { int r; assert(link); if (link_has_carrier(link)) { 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; } /* This is called every time an interface admin state changes to up; * specifically, when IFF_UP flag changes from unset to set */ static int link_admin_state_up(Link *link) { int r; assert(link); if (!link->network) return 0; if (link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_DOWN) { log_link_info(link, "ActivationPolicy is \"always-off\", forcing link down"); return link_down(link, NULL); } /* We set the ipv6 mtu after the device mtu, but the kernel resets * ipv6 mtu on NETDEV_UP, so we need to reset it. The check for * ipv6_mtu_set prevents this from trying to set it too early before * the link->network has been setup; we only need to reset it * here if we've already set it during normal initialization. */ if (link->ipv6_mtu_set) { r = link_set_ipv6_mtu(link); if (r < 0) return r; } return 0; } static int link_admin_state_down(Link *link) { assert(link); if (!link->network) return 0; if (link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) { log_link_info(link, "ActivationPolicy is \"always-on\", forcing link up"); return link_up(link); } return 0; } int link_update(Link *link, sd_netlink_message *m) { _cleanup_strv_free_ char **s = NULL; hw_addr_data hw_addr; const char *ifname; uint32_t mtu; bool had_carrier, carrier_gained, carrier_lost, link_was_admin_up; int old_master, r; assert(link); assert(link->ifname); assert(m); if (link->state == LINK_STATE_LINGER) { log_link_info(link, "Link re-added"); link_set_state(link, LINK_STATE_CONFIGURING); r = link_new_carrier_maps(link); if (r < 0) return r; } r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname); if (r >= 0 && !streq(ifname, link->ifname)) { Manager *manager = link->manager; log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname); link_drop(link); r = link_add(manager, m, &link); if (r < 0) return r; } r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s); if (r >= 0) strv_free_and_replace(link->alternative_names, s); r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu); if (r >= 0 && mtu > 0) { link->mtu = mtu; if (link->original_mtu == 0) { link->original_mtu = mtu; log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu); } if (link->dhcp_client) { r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu); if (r < 0) return log_link_warning_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_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m"); } } /* The kernel may broadcast NEWLINK messages without the MAC address set, simply ignore them. */ r = netlink_message_read_hw_addr(m, IFLA_ADDRESS, &hw_addr); if (r >= 0 && (link->hw_addr.length != hw_addr.length || memcmp(link->hw_addr.addr.bytes, hw_addr.addr.bytes, hw_addr.length) != 0)) { memcpy(link->hw_addr.addr.bytes, hw_addr.addr.bytes, hw_addr.length); log_link_debug(link, "Gained new hardware address: %s", HW_ADDR_TO_STR(&hw_addr)); r = ipv4ll_update_mac(link); if (r < 0) return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m"); r = dhcp4_update_mac(link); if (r < 0) return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m"); r = dhcp6_update_mac(link); if (r < 0) return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m"); r = radv_update_mac(link); if (r < 0) return log_link_warning_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.addr.ether); if (r < 0) return log_link_warning_errno(link, r, "Could not update MAC for NDisc: %m"); } r = ipv4_dad_update_mac(link); if (r < 0) return log_link_warning_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m"); } old_master = link->master_ifindex; (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex); link_was_admin_up = link->flags & IFF_UP; had_carrier = link_has_carrier(link); r = link_update_flags(link, m, old_master != link->master_ifindex); 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; carrier_gained = !had_carrier && link_has_carrier(link); carrier_lost = had_carrier && !link_has_carrier(link); if (carrier_gained) { log_link_info(link, "Gained carrier"); r = link_carrier_gained(link); if (r < 0) return r; } else if (carrier_lost) { log_link_info(link, "Lost carrier"); r = link_carrier_lost(link); if (r < 0) return r; } return 0; } static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) { bool space = false; Link *link; assert(f); assert(prefix); if (hashmap_isempty(h)) return; fputs(prefix, f); HASHMAP_FOREACH(link, h) { if (space) fputc(' ', f); fprintf(f, "%i", link->ifindex); space = true; } fputc('\n', f); } static void link_save_dns(Link *link, FILE *f, struct in_addr_full **dns, unsigned n_dns, bool *space) { for (unsigned j = 0; j < n_dns; j++) { const char *str; if (dns[j]->ifindex != 0 && dns[j]->ifindex != link->ifindex) continue; str = in_addr_full_to_string(dns[j]); if (!str) continue; if (*space) fputc(' ', f); fputs(str, f); *space = true; } } static void serialize_addresses( FILE *f, const char *lvalue, bool *space, char **addresses, sd_dhcp_lease *lease, bool conditional, sd_dhcp_lease_server_type what, sd_dhcp6_lease *lease6, bool conditional6, int (*lease6_get_addr)(sd_dhcp6_lease*, const struct in6_addr**), int (*lease6_get_fqdn)(sd_dhcp6_lease*, char ***)) { int r; bool _space = false; if (!space) space = &_space; if (lvalue) fprintf(f, "%s=", lvalue); fputstrv(f, addresses, NULL, space); if (lease && conditional) { const struct in_addr *lease_addresses; r = sd_dhcp_lease_get_servers(lease, what, &lease_addresses); if (r > 0) serialize_in_addrs(f, lease_addresses, r, space, in4_addr_is_non_local); } if (lease6 && conditional6 && lease6_get_addr) { const struct in6_addr *in6_addrs; r = lease6_get_addr(lease6, &in6_addrs); if (r > 0) serialize_in6_addrs(f, in6_addrs, r, space); } if (lease6 && conditional6 && lease6_get_fqdn) { char **in6_hosts; r = lease6_get_fqdn(lease6, &in6_hosts); if (r > 0) fputstrv(f, in6_hosts, NULL, space); } if (lvalue) fputc('\n', f); } int link_save(Link *link) { const char *admin_state, *oper_state, *carrier_state, *address_state; _cleanup_free_ char *temp_path = NULL; _cleanup_fclose_ FILE *f = NULL; int r; assert(link); assert(link->state_file); assert(link->lease_file); assert(link->manager); if (link->state == LINK_STATE_LINGER) { (void) unlink(link->state_file); return 0; } link_lldp_save(link); admin_state = link_state_to_string(link->state); assert(admin_state); oper_state = link_operstate_to_string(link->operstate); assert(oper_state); carrier_state = link_carrier_state_to_string(link->carrier_state); assert(carrier_state); address_state = link_address_state_to_string(link->address_state); assert(address_state); r = fopen_temporary(link->state_file, &f, &temp_path); if (r < 0) goto fail; (void) fchmod(fileno(f), 0644); fprintf(f, "# This is private data. Do not parse.\n" "ADMIN_STATE=%s\n" "OPER_STATE=%s\n" "CARRIER_STATE=%s\n" "ADDRESS_STATE=%s\n", admin_state, oper_state, carrier_state, address_state); if (link->network) { char **dhcp6_domains = NULL, **dhcp_domains = NULL; const char *dhcp_domainname = NULL, *p; bool space; fprintf(f, "REQUIRED_FOR_ONLINE=%s\n", yes_no(link->network->required_for_online)); LinkOperationalStateRange st = link->network->required_operstate_for_online; fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s%s%s\n", strempty(link_operstate_to_string(st.min)), st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? ":" : "", st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? strempty(link_operstate_to_string(st.max)) : ""); fprintf(f, "ACTIVATION_POLICY=%s\n", activation_policy_to_string(link->network->activation_policy)); fprintf(f, "NETWORK_FILE=%s\n", link->network->filename); /************************************************************/ fputs("DNS=", f); space = false; if (link->n_dns != (unsigned) -1) link_save_dns(link, f, link->dns, link->n_dns, &space); else link_save_dns(link, f, link->network->dns, link->network->n_dns, &space); serialize_addresses(f, NULL, &space, NULL, link->dhcp_lease, link->network->dhcp_use_dns, SD_DHCP_LEASE_DNS, link->dhcp6_lease, link->network->dhcp6_use_dns, sd_dhcp6_lease_get_dns, NULL); /* Make sure to flush out old entries before we use the NDisc data */ ndisc_vacuum(link); if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) { NDiscRDNSS *dd; SET_FOREACH(dd, link->ndisc_rdnss) serialize_in6_addrs(f, &dd->address, 1, &space); } fputc('\n', f); /************************************************************/ serialize_addresses(f, "NTP", NULL, link->ntp ?: link->network->ntp, link->dhcp_lease, link->network->dhcp_use_ntp, SD_DHCP_LEASE_NTP, link->dhcp6_lease, link->network->dhcp6_use_ntp, sd_dhcp6_lease_get_ntp_addrs, sd_dhcp6_lease_get_ntp_fqdn); serialize_addresses(f, "SIP", NULL, NULL, link->dhcp_lease, link->network->dhcp_use_sip, SD_DHCP_LEASE_SIP, NULL, false, NULL, NULL); /************************************************************/ if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) { if (link->dhcp_lease) { (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname); (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains); } if (link->dhcp6_lease) (void) sd_dhcp6_lease_get_domains(link->dhcp6_lease, &dhcp6_domains); } fputs("DOMAINS=", f); space = false; ORDERED_SET_FOREACH(p, link->search_domains ?: link->network->search_domains) fputs_with_space(f, p, NULL, &space); if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) { if (dhcp_domainname) fputs_with_space(f, dhcp_domainname, NULL, &space); if (dhcp_domains) fputstrv(f, dhcp_domains, NULL, &space); if (dhcp6_domains) fputstrv(f, dhcp6_domains, NULL, &space); } if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_YES) { NDiscDNSSL *dd; SET_FOREACH(dd, link->ndisc_dnssl) fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space); } fputc('\n', f); /************************************************************/ fputs("ROUTE_DOMAINS=", f); space = false; ORDERED_SET_FOREACH(p, link->route_domains ?: link->network->route_domains) fputs_with_space(f, p, NULL, &space); if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) { if (dhcp_domainname) fputs_with_space(f, dhcp_domainname, NULL, &space); if (dhcp_domains) fputstrv(f, dhcp_domains, NULL, &space); if (dhcp6_domains) fputstrv(f, dhcp6_domains, NULL, &space); } if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_ROUTE) { NDiscDNSSL *dd; SET_FOREACH(dd, link->ndisc_dnssl) fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space); } fputc('\n', f); /************************************************************/ fprintf(f, "LLMNR=%s\n", resolve_support_to_string(link->llmnr >= 0 ? link->llmnr : link->network->llmnr)); /************************************************************/ fprintf(f, "MDNS=%s\n", resolve_support_to_string(link->mdns >= 0 ? link->mdns : link->network->mdns)); /************************************************************/ int dns_default_route = link->dns_default_route >= 0 ? link->dns_default_route : link->network->dns_default_route; if (dns_default_route >= 0) fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(dns_default_route)); /************************************************************/ DnsOverTlsMode dns_over_tls_mode = link->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID ? link->dns_over_tls_mode : link->network->dns_over_tls_mode; if (dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID) fprintf(f, "DNS_OVER_TLS=%s\n", dns_over_tls_mode_to_string(dns_over_tls_mode)); /************************************************************/ DnssecMode dnssec_mode = link->dnssec_mode != _DNSSEC_MODE_INVALID ? link->dnssec_mode : link->network->dnssec_mode; if (dnssec_mode != _DNSSEC_MODE_INVALID) fprintf(f, "DNSSEC=%s\n", dnssec_mode_to_string(dnssec_mode)); /************************************************************/ Set *nta_anchors = link->dnssec_negative_trust_anchors; if (set_isempty(nta_anchors)) nta_anchors = link->network->dnssec_negative_trust_anchors; if (!set_isempty(nta_anchors)) { const char *n; fputs("DNSSEC_NTA=", f); space = false; SET_FOREACH(n, nta_anchors) fputs_with_space(f, n, NULL, &space); fputc('\n', f); } } print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links); print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links); if (link->dhcp_lease) { r = dhcp_lease_save(link->dhcp_lease, link->lease_file); if (r < 0) goto fail; fprintf(f, "DHCP_LEASE=%s\n", link->lease_file); } else (void) unlink(link->lease_file); r = link_serialize_dhcp6_client(link, f); if (r < 0) goto fail; r = fflush_and_check(f); if (r < 0) goto fail; r = conservative_rename(temp_path, link->state_file); if (r < 0) goto fail; return 0; fail: (void) unlink(link->state_file); if (temp_path) (void) unlink(temp_path); return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file); } /* The serialized state in /run is no longer up-to-date. */ void link_dirty(Link *link) { int r; assert(link); /* mark manager dirty as link is dirty */ manager_dirty(link->manager); r = set_ensure_put(&link->manager->dirty_links, NULL, link); if (r <= 0) /* Ignore allocation errors and don't take another ref if the link was already dirty */ return; link_ref(link); } /* The serialized state in /run is up-to-date */ void link_clean(Link *link) { assert(link); assert(link->manager); link_unref(set_remove(link->manager->dirty_links, link)); } int link_save_and_clean(Link *link) { int r; r = link_save(link); if (r < 0) return r; link_clean(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 log_link_message_full_errno(Link *link, sd_netlink_message *m, int level, int err, const char *msg) { const char *err_msg = NULL; (void) sd_netlink_message_read_string(m, NLMSGERR_ATTR_MSG, &err_msg); return log_link_full_errno(link, level, err, "%s: %s%s%s%m", msg, strempty(err_msg), err_msg && !endswith(err_msg, ".") ? "." : "", err_msg ? " " : ""); }