/* SPDX-License-Identifier: LGPL-2.1+ */ #include #include #include #include "alloc-util.h" #include "bus-util.h" #include "dhcp-identifier.h" #include "dhcp-lease-internal.h" #include "env-file.h" #include "fd-util.h" #include "fileio.h" #include "missing_network.h" #include "netdev/bond.h" #include "netdev/bridge.h" #include "netdev/ipvlan.h" #include "netdev/vrf.h" #include "netlink-util.h" #include "network-internal.h" #include "networkd-can.h" #include "networkd-dhcp-server.h" #include "networkd-dhcp4.h" #include "networkd-dhcp6.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-radv.h" #include "networkd-routing-policy-rule.h" #include "set.h" #include "socket-util.h" #include "stdio-util.h" #include "string-table.h" #include "strv.h" #include "sysctl-util.h" #include "tmpfile-util.h" #include "udev-util.h" #include "util.h" #include "virt.h" uint32_t link_get_vrf_table(Link *link) { return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN; } uint32_t link_get_dhcp_route_table(Link *link) { /* When the interface is part of an VRF use the VRFs routing table, unless * another table is explicitly specified. */ if (link->network->dhcp_route_table_set) return link->network->dhcp_route_table; return link_get_vrf_table(link); } uint32_t link_get_ipv6_accept_ra_route_table(Link *link) { if (link->network->ipv6_accept_ra_route_table_set) return link->network->ipv6_accept_ra_route_table; return link_get_vrf_table(link); } DUID* link_get_duid(Link *link) { if (link->network->duid.type != _DUID_TYPE_INVALID) return &link->network->duid; else return &link->manager->duid; } int link_sysctl_ipv6_enabled(Link *link) { _cleanup_free_ char *value = NULL; int r; assert(link); assert(link->ifname); if (link->sysctl_ipv6_enabled >= 0) return link->sysctl_ipv6_enabled; const char *ifname = link->ifname; /* work around bogus gcc warning */ r = sysctl_read_ip_property(AF_INET6, ifname, "disable_ipv6", &value); if (r < 0) return log_link_warning_errno(link, r, "Failed to read net.ipv6.conf.%s.disable_ipv6 sysctl property: %m", ifname); link->sysctl_ipv6_enabled = value[0] == '0'; return link->sysctl_ipv6_enabled; } static bool link_dhcp6_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->network->bond) return false; if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan")) return false; if (link_sysctl_ipv6_enabled(link) == 0) return false; return link->network->dhcp & ADDRESS_FAMILY_IPV6; } static bool link_dhcp4_enabled(Link *link) { assert(link); if (link->flags & IFF_LOOPBACK) return false; if (!link->network) return false; if (link->network->bond) return false; if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan")) return false; return link->network->dhcp & ADDRESS_FAMILY_IPV4; } static bool link_dhcp4_server_enabled(Link *link) { assert(link); if (link->flags & IFF_LOOPBACK) return false; if (!link->network) return false; if (link->network->bond) return false; if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan")) return false; return link->network->dhcp_server; } bool link_ipv4ll_enabled(Link *link, AddressFamilyBoolean mask) { assert(link); assert((mask & ~(ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) == 0); if (link->flags & IFF_LOOPBACK) return false; if (!link->network) return false; if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "ip6gre","ip6tnl", "sit", "vti", "vti6", "can", "vcan", "vxcan", "nlmon", "xfrm")) 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 & mask; } static 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 (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "sit", "vti", "can", "vcan", "vxcan", "nlmon")) return false; if (link->network->bond) return false; if (link_sysctl_ipv6_enabled(link) == 0) return false; return link->network->link_local & ADDRESS_FAMILY_IPV6; } static bool link_ipv6_enabled(Link *link) { assert(link); if (!socket_ipv6_is_supported()) return false; if (link->network->bond) return false; if (link_sysctl_ipv6_enabled(link) == 0) return false; if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan")) return false; /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */ return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network); } static bool link_radv_enabled(Link *link) { assert(link); if (!link_ipv6ll_enabled(link)) return false; return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE; } static bool link_ipv4_forward_enabled(Link *link) { assert(link); if (link->flags & IFF_LOOPBACK) return false; if (!link->network) return false; if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID) return false; return link->network->ip_forward & ADDRESS_FAMILY_IPV4; } static bool link_ipv6_forward_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->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID) return false; if (link_sysctl_ipv6_enabled(link) == 0) return false; return link->network->ip_forward & ADDRESS_FAMILY_IPV6; } static bool link_proxy_arp_enabled(Link *link) { assert(link); if (link->flags & IFF_LOOPBACK) return false; if (!link->network) return false; if (link->network->proxy_arp < 0) return false; return true; } static bool link_ipv6_accept_ra_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_ipv6ll_enabled(link)) return false; /* If unset use system default (enabled if local forwarding is disabled. * disabled if local forwarding is enabled). * If set, ignore or enforce RA independent of local forwarding state. */ if (link->network->ipv6_accept_ra < 0) /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */ return !link_ipv6_forward_enabled(link); else if (link->network->ipv6_accept_ra > 0) /* accept RA even if ip_forward is enabled */ return true; else /* ignore RA */ return false; } static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) { assert(link); if (!socket_ipv6_is_supported()) return _IPV6_PRIVACY_EXTENSIONS_INVALID; if (link->flags & IFF_LOOPBACK) return _IPV6_PRIVACY_EXTENSIONS_INVALID; if (!link->network) return _IPV6_PRIVACY_EXTENSIONS_INVALID; return link->network->ipv6_privacy_extensions; } static int link_enable_ipv6(Link *link) { bool disabled; int r; if (link->flags & IFF_LOOPBACK) return 0; disabled = !link_ipv6_enabled(link); r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", disabled); if (r < 0) log_link_warning_errno(link, r, "Cannot %s IPv6: %m", enable_disable(!disabled)); else log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled)); return 0; } 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 (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; Iterator i; 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, i) { 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, i) { 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, i) { 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; uint16_t type; const char *ifname, *kind = NULL; int r, ifindex; unsigned short iftype; 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, .rtnl_extended_attrs = true, .ifindex = ifindex, .iftype = iftype, .sysctl_ipv6_enabled = -1, .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 = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac); if (r < 0) log_link_debug_errno(link, r, "MAC address not found for new device, continuing without"); 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_allocated(&manager->links, NULL); if (r < 0) return r; r = hashmap_put(manager->links, 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) { 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 Link *link_free(Link *link) { Address *address; assert(link); link_ntp_settings_clear(link); link_dns_settings_clear(link); link->routes = set_free_with_destructor(link->routes, route_free); link->routes_foreign = set_free_with_destructor(link->routes_foreign, route_free); link->addresses = set_free_with_destructor(link->addresses, address_free); link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free); while ((address = link->pool_addresses)) { LIST_REMOVE(addresses, link->pool_addresses, address); address_free(address); } sd_dhcp_server_unref(link->dhcp_server); sd_dhcp_client_unref(link->dhcp_client); sd_dhcp_lease_unref(link->dhcp_lease); link_lldp_emit_stop(link); free(link->lease_file); sd_lldp_unref(link->lldp); free(link->lldp_file); ndisc_flush(link); sd_ipv4ll_unref(link->ipv4ll); sd_dhcp6_client_unref(link->dhcp6_client); sd_ndisc_unref(link->ndisc); sd_radv_unref(link->radv); free(link->ifname); free(link->kind); (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); 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); } static void link_enter_unmanaged(Link *link) { assert(link); link_set_state(link, LINK_STATE_UNMANAGED); link_dirty(link); } int link_stop_clients(Link *link, bool may_keep_dhcp) { int r = 0, k; assert(link); assert(link->manager); assert(link->manager->event); dhcp4_release_old_lease(link); if (link->dhcp_client && (!may_keep_dhcp || !link->network || !FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP))) { k = sd_dhcp_client_stop(link->dhcp_client); if (k < 0) r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m"); } if (link->ipv4ll) { k = sd_ipv4ll_stop(link->ipv4ll); if (k < 0) r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m"); } if (link->dhcp6_client) { k = sd_dhcp6_client_stop(link->dhcp6_client); if (k < 0) r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m"); } if (link->ndisc) { k = sd_ndisc_stop(link->ndisc); if (k < 0) r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m"); } if (link->radv) { 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); link_stop_clients(link, false); link_dirty(link); } static int link_join_netdevs_after_configured(Link *link) { NetDev *netdev; Iterator i; int r; HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) { 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; log_link_info(link, "Configured"); link_set_state(link, LINK_STATE_CONFIGURED); (void) link_join_netdevs_after_configured(link); link_dirty(link); } static int link_request_set_routing_policy_rule(Link *link) { RoutingPolicyRule *rule, *rrule = NULL; int r; assert(link); assert(link->network); link->routing_policy_rules_configured = false; LIST_FOREACH(rules, rule, link->network->rules) { r = routing_policy_rule_get(link->manager, rule, &rrule); if (r >= 0) { if (r == 0) (void) routing_policy_rule_make_local(link->manager, rrule); continue; } r = routing_policy_rule_configure(rule, link, NULL); if (r < 0) return log_link_warning_errno(link, r, "Could not set routing policy rules: %m"); if (r > 0) link->routing_policy_rule_messages++; } routing_policy_rule_purge(link->manager, link); if (link->routing_policy_rule_messages == 0) { link->routing_policy_rules_configured = true; link_check_ready(link); } else { log_link_debug(link, "Setting routing policy rules"); link_set_state(link, LINK_STATE_CONFIGURING); } return 0; } static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { int r; assert(link); assert(link->route_messages > 0); assert(IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_FAILED, LINK_STATE_LINGER)); link->route_messages--; 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_warning_errno(link, r, "Could not set route: %m"); link_enter_failed(link); return 1; } if (link->route_messages == 0) { log_link_debug(link, "Routes set"); link->static_routes_configured = true; link_check_ready(link); } return 1; } int link_request_set_routes(Link *link) { enum { PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */ PHASE_GATEWAY, /* Second phase: Routes with a gateway */ _PHASE_MAX } phase; Route *rt; int r; assert(link); assert(link->network); assert(link->addresses_configured); assert(link->address_messages == 0); assert(link->state != _LINK_STATE_INVALID); link->static_routes_configured = false; if (!link_has_carrier(link) && !link->network->configure_without_carrier) /* During configuring addresses, the link lost its carrier. As networkd is dropping * the addresses now, let's not configure the routes either. */ return 0; r = link_request_set_routing_policy_rule(link); if (r < 0) return r; /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */ for (phase = 0; phase < _PHASE_MAX; phase++) LIST_FOREACH(routes, rt, link->network->static_routes) { if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY)) continue; r = route_configure(rt, link, route_handler); if (r < 0) return log_link_warning_errno(link, r, "Could not set routes: %m"); if (r > 0) link->route_messages++; } if (link->route_messages == 0) { link->static_routes_configured = true; link_check_ready(link); } else { log_link_debug(link, "Setting routes"); link_set_state(link, LINK_STATE_CONFIGURING); } return 0; } void link_check_ready(Link *link) { Address *a; Iterator i; int r; assert(link); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return; if (!link->network) return; if (!link->addresses_configured) return; if (!link->neighbors_configured) return; SET_FOREACH(a, link->addresses, i) if (!address_is_ready(a)) return; if (!link->addresses_ready) { link->addresses_ready = true; r = link_request_set_routes(link); if (r < 0) link_enter_failed(link); return; } if (!link->static_routes_configured) return; if (!link->routing_policy_rules_configured) return; if (link_has_carrier(link) || !link->network->configure_without_carrier) { if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !(link->ipv4ll_address && link->ipv4ll_route)) return; if (link_ipv6ll_enabled(link) && in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) return; if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) && !link->dhcp4_configured && !link->dhcp6_configured && !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address && link->ipv4ll_route)) /* When DHCP is enabled, at least one protocol must provide an address, or * an IPv4ll fallback address must be configured. */ return; if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured) return; } if (link->state != LINK_STATE_CONFIGURED) link_enter_configured(link); return; } static int link_request_set_neighbors(Link *link) { Neighbor *neighbor; int r; assert(link); assert(link->network); assert(link->state != _LINK_STATE_INVALID); link->neighbors_configured = false; LIST_FOREACH(neighbors, neighbor, link->network->neighbors) { r = neighbor_configure(neighbor, link, NULL); if (r < 0) return log_link_warning_errno(link, r, "Could not set neighbor: %m"); } if (link->neighbor_messages == 0) { link->neighbors_configured = true; link_check_ready(link); } else { log_link_debug(link, "Setting neighbors"); link_set_state(link, LINK_STATE_CONFIGURING); } return 0; } static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { int r; assert(rtnl); assert(m); assert(link); assert(link->ifname); assert(link->address_messages > 0); assert(IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_FAILED, LINK_STATE_LINGER)); link->address_messages--; 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_warning_errno(link, r, "could not set address: %m"); link_enter_failed(link); return 1; } else if (r >= 0) (void) manager_rtnl_process_address(rtnl, m, link->manager); if (link->address_messages == 0) { log_link_debug(link, "Addresses set"); link->addresses_configured = true; link_check_ready(link); } return 1; } static int link_set_bridge_fdb(Link *link) { FdbEntry *fdb_entry; int r; LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) { r = fdb_entry_configure(link, fdb_entry); if (r < 0) return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m"); } return 0; } static int link_request_set_addresses(Link *link) { AddressLabel *label; Address *ad; int r; assert(link); assert(link->network); assert(link->state != _LINK_STATE_INVALID); /* Reset all *_configured flags we are configuring. */ link->addresses_configured = false; link->addresses_ready = false; link->neighbors_configured = false; link->static_routes_configured = false; link->routing_policy_rules_configured = false; r = link_set_bridge_fdb(link); if (r < 0) return r; r = link_request_set_neighbors(link); if (r < 0) return r; LIST_FOREACH(addresses, ad, link->network->static_addresses) { bool update; update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0; r = address_configure(ad, link, address_handler, update); if (r < 0) return log_link_warning_errno(link, r, "Could not set addresses: %m"); if (r > 0) link->address_messages++; } LIST_FOREACH(labels, label, link->network->address_labels) { r = address_label_configure(label, link, NULL, false); if (r < 0) return log_link_warning_errno(link, r, "Could not set address label: %m"); link->address_label_messages++; } /* now that we can figure out a default address for the dhcp server, start it */ if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) { r = dhcp4_server_configure(link); if (r < 0) return r; log_link_debug(link, "Offering DHCPv4 leases"); } if (link->address_messages == 0) { link->addresses_configured = true; link_check_ready(link); } else { log_link_debug(link, "Setting addresses"); link_set_state(link, LINK_STATE_CONFIGURING); } return 0; } static int link_set_bridge_vlan(Link *link) { int r; r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap); if (r < 0) log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m"); return r; } static int link_set_proxy_arp(Link *link) { int r; if (!link_proxy_arp_enabled(link)) return 0; r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0); if (r < 0) log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m"); return 0; } static int link_configure_after_setting_mtu(Link *link); 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_warning_errno(link, r, "Could not set MTU, ignoring: %m"); else log_link_debug(link, "Setting MTU done."); if (link->state == LINK_STATE_INITIALIZED) { r = link_configure_after_setting_mtu(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"); /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled) * for this interface, then disable IPv6 else enable it. */ (void) link_enable_ipv6(link); /* 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: %m"); 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; Iterator i; HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i) 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_warning_errno(link, r, "Could not set link flags, ignoring: %m"); 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) 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); } 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_ipv6_accept_ra_enabled(link)) { assert(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_enabled(link)) { assert(link->radv); assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0); log_link_debug(link, "Starting IPv6 Router Advertisements"); 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"); } (void) dhcp6_request_prefix_delegation(link); return 0; } static int link_acquire_ipv4_conf(Link *link) { int r; assert(link); assert(link->manager); assert(link->manager->event); if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) { assert(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_dhcp4_enabled(link)) { assert(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"); } 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 (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) { r = link_acquire_ipv6_conf(link); if (r < 0) return r; } if (link_lldp_emit_enabled(link)) { 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); 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_warning_errno(link, r, "Could not set address genmode for interface, ignoring: %m"); 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()) 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 (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0) /* The file may not exist. And event if it exists, when stable_secret is unset, * reading the file fails with EIO. */ ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64; else ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 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); 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_warning_errno(link, r, "Could not bring up interface: %m"); 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"); /* set it free if not enslaved with networkd */ if (!link->network->bridge && !link->network->bond && !link->network->vrf) { 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 = 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"); if (link->network->mac) { 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_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_warning_errno(link, r, "Could not bring down interface: %m"); 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_handle_bound_to_list(Link *link) { Link *l; Iterator i; 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, i) 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) { Iterator i; Link *l; int r; assert(link); if (hashmap_isempty(link->bound_by_links)) return 0; HASHMAP_FOREACH (l, link->bound_by_links, i) { 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_allocated(h, NULL); if (r < 0) return r; r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier); if (r < 0) return r; return 0; } static int link_new_bound_by_list(Link *link) { Manager *m; Link *carrier; Iterator i; int r; bool list_updated = false; assert(link); assert(link->manager); m = link->manager; HASHMAP_FOREACH(carrier, m->links, i) { if (!carrier->network) continue; if (strv_isempty(carrier->network->bind_carrier)) continue; if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) { r = link_put_carrier(link, carrier, &link->bound_by_links); if (r < 0) return r; list_updated = true; } } if (list_updated) link_dirty(link); HASHMAP_FOREACH(carrier, link->bound_by_links, i) { r = link_put_carrier(carrier, link, &carrier->bound_to_links); if (r < 0) return r; link_dirty(carrier); } return 0; } static int link_new_bound_to_list(Link *link) { Manager *m; Link *carrier; Iterator i; int r; bool list_updated = false; 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, i) { if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) { r = link_put_carrier(link, carrier, &link->bound_to_links); if (r < 0) return r; list_updated = true; } } if (list_updated) link_dirty(link); HASHMAP_FOREACH (carrier, link->bound_to_links, i) { r = link_put_carrier(carrier, link, &carrier->bound_by_links); if (r < 0) return r; link_dirty(carrier); } 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) { Link *bound_to; Iterator i; HASHMAP_FOREACH (bound_to, link->bound_to_links, i) { hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex)); if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex))) link_dirty(bound_to); } return; } static void link_free_bound_by_list(Link *link) { Link *bound_by; Iterator i; HASHMAP_FOREACH (bound_by, link->bound_by_links, i) { hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex)); if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) { link_dirty(bound_by); link_handle_bound_to_list(bound_by); } } return; } static void link_free_carrier_maps(Link *link) { bool list_updated = false; assert(link); if (!hashmap_isempty(link->bound_to_links)) { link_free_bound_to_list(link); list_updated = true; } if (!hashmap_isempty(link->bound_by_links)) { link_free_bound_by_list(link); list_updated = true; } if (list_updated) link_dirty(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_allocated(&master->slaves, NULL); if (r < 0) return r; r = set_put(master->slaves, 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); if (!hashmap_isempty(link->bound_to_links)) { r = link_handle_bound_to_list(link); if (r < 0) return r; } else if (!(link->flags & IFF_UP)) { r = link_up(link); if (r < 0) { link_enter_failed(link); return r; } } 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"); } if (link->network->use_br_vlan && (link->network->bridge || streq_ptr("bridge", link->kind))) { 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); return link_request_set_addresses(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_error_errno(link, r, "Could not join netdev: %m"); 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; Iterator i; int r; assert(link); assert(link->network); assert(link->state == LINK_STATE_INITIALIZED); link_set_state(link, LINK_STATE_CONFIGURING); link_dirty(link); 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, i) { 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_set_ipv4_forward(Link *link) { int r; if (!link_ipv4_forward_enabled(link)) return 0; /* We propagate the forwarding flag from one interface to the * global setting one way. This means: as long as at least one * interface was configured at any time that had IP forwarding * enabled the setting will stay on for good. We do this * primarily to keep IPv4 and IPv6 packet forwarding behaviour * somewhat in sync (see below). */ r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1"); if (r < 0) log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m"); return 0; } static int link_set_ipv6_forward(Link *link) { int r; if (!link_ipv6_forward_enabled(link)) return 0; /* On Linux, the IPv6 stack does not know a per-interface * packet forwarding setting: either packet forwarding is on * for all, or off for all. We hence don't bother with a * per-interface setting, but simply propagate the interface * flag, if it is set, to the global flag, one-way. Note that * while IPv4 would allow a per-interface flag, we expose the * same behaviour there and also propagate the setting from * one to all, to keep things simple (see above). */ r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1"); if (r < 0) log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m"); return 0; } static int link_set_ipv6_privacy_extensions(Link *link) { IPv6PrivacyExtensions s; int r; s = link_ipv6_privacy_extensions(link); if (s < 0) return 0; r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions); if (r < 0) log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m"); return 0; } static int link_set_ipv6_accept_ra(Link *link) { int r; /* Make this a NOP if IPv6 is not available */ if (!socket_ipv6_is_supported()) return 0; if (link->flags & IFF_LOOPBACK) return 0; if (!link->network) return 0; r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0"); if (r < 0) log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m"); return 0; } static int link_set_ipv6_dad_transmits(Link *link) { int r; /* Make this a NOP if IPv6 is not available */ if (!socket_ipv6_is_supported()) return 0; if (link->flags & IFF_LOOPBACK) return 0; if (!link->network) return 0; if (link->network->ipv6_dad_transmits < 0) return 0; r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits); if (r < 0) log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m"); return 0; } static int link_set_ipv6_hop_limit(Link *link) { int r; /* Make this a NOP if IPv6 is not available */ if (!socket_ipv6_is_supported()) return 0; if (link->flags & IFF_LOOPBACK) return 0; if (!link->network) return 0; if (link->network->ipv6_hop_limit < 0) return 0; r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit); if (r < 0) log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m"); return 0; } static int link_set_ipv6_mtu(Link *link) { int r; /* Make this a NOP if IPv6 is not available */ if (!socket_ipv6_is_supported()) return 0; if (link->flags & IFF_LOOPBACK) return 0; if (link->network->ipv6_mtu == 0) return 0; r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu); if (r < 0) log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m"); return 0; } static bool link_is_static_address_configured(Link *link, Address *address) { Address *net_address; assert(link); assert(address); if (!link->network) return false; LIST_FOREACH(addresses, net_address, link->network->static_addresses) if (address_equal(net_address, address)) return true; return false; } static bool link_is_static_route_configured(Link *link, Route *route) { Route *net_route; assert(link); assert(route); if (!link->network) return false; LIST_FOREACH(routes, net_route, link->network->static_routes) if (route_equal(net_route, route)) return true; return false; } static bool link_address_is_dynamic(Link *link, Address *address) { Route *route; Iterator i; assert(link); assert(address); if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME) return true; /* Even when the address is leased from a DHCP server, networkd assign the address * without lifetime when KeepConfiguration=dhcp. So, let's check that we have * corresponding routes with RTPROT_DHCP. */ SET_FOREACH(route, link->routes_foreign, i) { if (route->protocol != RTPROT_DHCP) continue; if (address->family != route->family) continue; if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc)) return true; } return false; } static int link_drop_foreign_config(Link *link) { Address *address; Route *route; Iterator i; int r; SET_FOREACH(address, link->addresses_foreign, i) { /* we consider IPv6LL addresses to be managed by the kernel */ if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1) continue; if (link_address_is_dynamic(link, address)) { if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) continue; } else if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC)) continue; if (link_is_static_address_configured(link, address)) { r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL); if (r < 0) return log_link_error_errno(link, r, "Failed to add address: %m"); } else { r = address_remove(address, link, NULL); if (r < 0) return r; } } SET_FOREACH(route, link->routes_foreign, i) { /* do not touch routes managed by the kernel */ if (route->protocol == RTPROT_KERNEL) continue; if (route->protocol == RTPROT_STATIC && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC)) continue; if (route->protocol == RTPROT_DHCP && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) continue; if (link_is_static_route_configured(link, route)) { r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL); if (r < 0) return r; } else { r = route_remove(route, link, NULL); if (r < 0) return r; } } return 0; } static int link_drop_config(Link *link) { Address *address, *pool_address; Route *route; Iterator i; int r; SET_FOREACH(address, link->addresses, i) { /* we consider IPv6LL addresses to be managed by the kernel */ if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1) continue; r = address_remove(address, link, NULL); if (r < 0) return r; /* If this address came from an address pool, clean up the pool */ LIST_FOREACH(addresses, pool_address, link->pool_addresses) { if (address_equal(address, pool_address)) { LIST_REMOVE(addresses, link->pool_addresses, pool_address); address_free(pool_address); break; } } } SET_FOREACH(route, link->routes, i) { /* do not touch routes managed by the kernel */ if (route->protocol == RTPROT_KERNEL) continue; r = route_remove(route, link, NULL); if (r < 0) return r; } ndisc_flush(link); return 0; } static int link_configure(Link *link) { int r; assert(link); assert(link->network); assert(link->state == LINK_STATE_INITIALIZED); if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan")) return link_configure_can(link); /* 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_set_proxy_arp(link); if (r < 0) return r; r = ipv6_proxy_ndp_addresses_configure(link); if (r < 0) return r; r = link_set_ipv4_forward(link); if (r < 0) return r; r = link_set_ipv6_forward(link); if (r < 0) return r; r = link_set_ipv6_privacy_extensions(link); if (r < 0) return r; r = link_set_ipv6_accept_ra(link); if (r < 0) return r; r = link_set_ipv6_dad_transmits(link); if (r < 0) return r; r = link_set_ipv6_hop_limit(link); if (r < 0) return r; r = link_set_flags(link); if (r < 0) return r; r = link_set_ipv6_mtu(link); if (r < 0) return r; if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) { r = ipv4ll_configure(link); if (r < 0) return r; } if (link_dhcp4_enabled(link)) { r = dhcp4_set_promote_secondaries(link); if (r < 0) return r; r = dhcp4_configure(link); if (r < 0) return r; } if (link_dhcp4_server_enabled(link)) { r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex); if (r < 0) return r; r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0); if (r < 0) return r; } if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link)) { r = dhcp6_configure(link); if (r < 0) return r; } if (link_ipv6_accept_ra_enabled(link)) { r = ndisc_configure(link); if (r < 0) return r; } if (link_radv_enabled(link)) { r = radv_configure(link); if (r < 0) return r; } if (link_lldp_rx_enabled(link)) { 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_after_setting_mtu(link); } static int link_configure_after_setting_mtu(Link *link) { int r; assert(link); assert(link->network); assert(link->state == LINK_STATE_INITIALIZED); if (link->setting_mtu) return 0; if (link_has_carrier(link) || link->network->configure_without_carrier) { r = link_acquire_conf(link); if (r < 0) return r; } return link_enter_join_netdev(link); } static int duid_set_uuid(DUID *duid, sd_id128_t uuid) { assert(duid); if (duid->raw_data_len > 0) return 0; if (duid->type != DUID_TYPE_UUID) return -EINVAL; memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t)); duid->raw_data_len = sizeof(sd_id128_t); return 1; } int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) { Manager *manager = userdata; const sd_bus_error *e; const void *a; size_t sz; DUID *duid; Link *link; int r; assert(m); assert(manager); e = sd_bus_message_get_error(m); if (e) { log_error_errno(sd_bus_error_get_errno(e), "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s", e->message); goto configure; } r = sd_bus_message_read_array(m, 'y', &a, &sz); if (r < 0) goto configure; if (sz != sizeof(sd_id128_t)) { log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID."); goto configure; } memcpy(&manager->product_uuid, a, sz); while ((duid = set_steal_first(manager->duids_requesting_uuid))) (void) duid_set_uuid(duid, manager->product_uuid); manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid); configure: while ((link = set_steal_first(manager->links_requesting_uuid))) { r = link_configure(link); if (r < 0) link_enter_failed(link); } manager->links_requesting_uuid = set_free(manager->links_requesting_uuid); /* To avoid calling GetProductUUID() bus method so frequently, set the flag below * even if the method fails. */ manager->has_product_uuid = true; return 1; } static bool link_requires_uuid(Link *link) { const DUID *duid; assert(link); assert(link->manager); assert(link->network); duid = link_get_duid(link); if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0) return false; if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY)) return true; if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link)) return true; return false; } static int link_configure_duid(Link *link) { Manager *m; DUID *duid; int r; assert(link); assert(link->manager); assert(link->network); m = link->manager; duid = link_get_duid(link); if (!link_requires_uuid(link)) return 1; if (m->has_product_uuid) { (void) duid_set_uuid(duid, m->product_uuid); return 1; } if (!m->links_requesting_uuid) { r = manager_request_product_uuid(m, link); if (r < 0) { if (r == -ENOMEM) return r; log_link_warning_errno(link, r, "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m"); return 1; } } else { r = set_put(m->links_requesting_uuid, link); if (r < 0) return log_oom(); r = set_put(m->duids_requesting_uuid, duid); if (r < 0) return log_oom(); } return 0; } 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 = network_get(link->manager, link->sd_device, link->ifname, &link->mac, &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"); } r = network_apply(network, link); if (r < 0) return r; } 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) { int r; 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; } static int link_load(Link *link) { _cleanup_free_ char *network_file = NULL, *addresses = NULL, *routes = NULL, *dhcp4_address = NULL, *ipv4ll_address = NULL; union in_addr_union address; union in_addr_union route_dst; const char *p; int r; assert(link); r = parse_env_file(NULL, link->state_file, "NETWORK_FILE", &network_file, "ADDRESSES", &addresses, "ROUTES", &routes, "DHCP4_ADDRESS", &dhcp4_address, "IPV4LL_ADDRESS", &ipv4ll_address); if (r < 0 && r != -ENOENT) return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file); if (network_file) { Network *network; char *suffix; /* drop suffix */ suffix = strrchr(network_file, '.'); if (!suffix) { log_link_debug(link, "Failed to get network name from %s", network_file); goto network_file_fail; } *suffix = '\0'; r = network_get_by_name(link->manager, basename(network_file), &network); if (r < 0) { log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file)); goto network_file_fail; } r = network_apply(network, link); if (r < 0) return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file)); } network_file_fail: if (addresses) { p = addresses; for (;;) { _cleanup_free_ char *address_str = NULL; char *prefixlen_str; int family; unsigned char prefixlen; r = extract_first_word(&p, &address_str, NULL, 0); if (r < 0) { log_link_debug_errno(link, r, "Failed to extract next address string: %m"); continue; } if (r == 0) break; prefixlen_str = strchr(address_str, '/'); if (!prefixlen_str) { log_link_debug(link, "Failed to parse address and prefix length %s", address_str); continue; } *prefixlen_str++ = '\0'; r = sscanf(prefixlen_str, "%hhu", &prefixlen); if (r != 1) { log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str); continue; } r = in_addr_from_string_auto(address_str, &family, &address); if (r < 0) { log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str); continue; } r = address_add(link, family, &address, prefixlen, NULL); if (r < 0) return log_link_error_errno(link, r, "Failed to add address: %m"); } } if (routes) { p = routes; for (;;) { Route *route; _cleanup_free_ char *route_str = NULL; _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL; usec_t lifetime; char *prefixlen_str; int family; unsigned char prefixlen, tos, table; uint32_t priority; r = extract_first_word(&p, &route_str, NULL, 0); if (r < 0) { log_link_debug_errno(link, r, "Failed to extract next route string: %m"); continue; } if (r == 0) break; prefixlen_str = strchr(route_str, '/'); if (!prefixlen_str) { log_link_debug(link, "Failed to parse route %s", route_str); continue; } *prefixlen_str++ = '\0'; r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime); if (r != 5) { log_link_debug(link, "Failed to parse destination prefix length, tos, priority, table or expiration %s", prefixlen_str); continue; } r = in_addr_from_string_auto(route_str, &family, &route_dst); if (r < 0) { log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str); continue; } r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route); if (r < 0) return log_link_error_errno(link, r, "Failed to add route: %m"); if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) { r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime, 0, route_expire_handler, route); if (r < 0) log_link_warning_errno(link, r, "Could not arm route expiration handler: %m"); } route->lifetime = lifetime; sd_event_source_unref(route->expire); route->expire = TAKE_PTR(expire); } } if (dhcp4_address) { r = in_addr_from_string(AF_INET, dhcp4_address, &address); if (r < 0) { log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address); goto dhcp4_address_fail; } r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0); if (r < 0) return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m"); r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in); if (r < 0) return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address); } dhcp4_address_fail: if (ipv4ll_address) { r = in_addr_from_string(AF_INET, ipv4ll_address, &address); if (r < 0) { log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address); goto ipv4ll_address_fail; } r = sd_ipv4ll_new(&link->ipv4ll); if (r < 0) return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m"); r = sd_ipv4ll_set_address(link->ipv4ll, &address.in); if (r < 0) return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address); } ipv4ll_address_fail: 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); r = link_load(link); if (r < 0) return r; if (detect_container() <= 0) { /* not in a container, udev will 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: %m"); goto failed; } r = sd_device_get_is_initialized(device); if (r < 0) { log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %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 renamed or not: %m"); goto failed; } if (r > 0) { log_link_debug(link, "Interface is under renaming, 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); 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_request_set_addresses(link); if (r < 0) return r; } r = link_handle_bound_by_list(link); if (r < 0) return r; 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_clients(link, false); if (r < 0) { link_enter_failed(link); return r; } if (link_dhcp4_server_enabled(link)) (void) sd_dhcp_server_stop(link->dhcp_server); r = link_drop_config(link); if (r < 0) return r; if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) { 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; } int link_update(Link *link, sd_netlink_message *m) { struct ether_addr mac; const char *ifname; uint32_t mtu; bool had_carrier, carrier_gained, carrier_lost; 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_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 = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac); if (r >= 0) { if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet, ETH_ALEN)) { memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet, ETH_ALEN); log_link_debug(link, "MAC address: " "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx", mac.ether_addr_octet[0], mac.ether_addr_octet[1], mac.ether_addr_octet[2], mac.ether_addr_octet[3], mac.ether_addr_octet[4], mac.ether_addr_octet[5]); if (link->ipv4ll) { r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac); if (r < 0) return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m"); } if (link->dhcp_client) { r = sd_dhcp_client_set_mac(link->dhcp_client, (const uint8_t *) &link->mac, sizeof (link->mac), ARPHRD_ETHER); if (r < 0) return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m"); r = dhcp4_set_client_identifier(link); if (r < 0) return r; } if (link->dhcp6_client) { const DUID* duid = link_get_duid(link); r = sd_dhcp6_client_set_mac(link->dhcp6_client, (const uint8_t *) &link->mac, sizeof (link->mac), ARPHRD_ETHER); if (r < 0) return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m"); if (link->network->iaid_set) { r = sd_dhcp6_client_set_iaid(link->dhcp6_client, link->network->iaid); if (r < 0) return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m"); } r = sd_dhcp6_client_set_duid(link->dhcp6_client, duid->type, duid->raw_data_len > 0 ? duid->raw_data : NULL, duid->raw_data_len); if (r < 0) return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m"); } if (link->radv) { r = sd_radv_set_mac(link->radv, &link->mac); if (r < 0) return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m"); } if (link->ndisc) { r = sd_ndisc_set_mac(link->ndisc, &link->mac); if (r < 0) return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m"); } } } old_master = link->master_ifindex; (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex); had_carrier = link_has_carrier(link); r = link_update_flags(link, m, old_master != link->master_ifindex); 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; Iterator i; Link *link; assert(f); assert(prefix); if (hashmap_isempty(h)) return; fputs(prefix, f); HASHMAP_FOREACH(link, h, i) { if (space) fputc(' ', f); fprintf(f, "%i", link->ifindex); space = true; } fputc('\n', f); } static void link_save_dns(FILE *f, struct in_addr_data *dns, unsigned n_dns, bool *space) { unsigned j; int r; for (j = 0; j < n_dns; j++) { _cleanup_free_ char *b = NULL; r = in_addr_to_string(dns[j].family, &dns[j].address, &b); if (r < 0) { log_debug_errno(r, "Failed to format address, ignoring: %m"); continue; } if (*space) fputc(' ', f); fputs(b, f); *space = true; } } int link_save(Link *link) { _cleanup_free_ char *temp_path = NULL; _cleanup_fclose_ FILE *f = NULL; const char *admin_state, *oper_state, *carrier_state, *address_state; Address *a; Route *route; Iterator i; 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; sd_dhcp6_lease *dhcp6_lease = NULL; bool space; fprintf(f, "REQUIRED_FOR_ONLINE=%s\n", yes_no(link->network->required_for_online)); fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n", strempty(link_operstate_to_string(link->network->required_operstate_for_online))); if (link->dhcp6_client) { r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease); if (r < 0 && r != -ENOMSG) log_link_debug(link, "No DHCPv6 lease"); } fprintf(f, "NETWORK_FILE=%s\n", link->network->filename); fputs("DNS=", f); space = false; if (link->n_dns != (unsigned) -1) link_save_dns(f, link->dns, link->n_dns, &space); else link_save_dns(f, link->network->dns, link->network->n_dns, &space); if (link->network->dhcp_use_dns && link->dhcp_lease) { const struct in_addr *addresses; r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses); if (r > 0) if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0) space = true; } if (link->network->dhcp6_use_dns && dhcp6_lease) { struct in6_addr *in6_addrs; r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs); if (r > 0) { if (space) fputc(' ', f); serialize_in6_addrs(f, in6_addrs, r); space = true; } } /* 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, i) { if (space) fputc(' ', f); serialize_in6_addrs(f, &dd->address, 1); space = true; } } fputc('\n', f); fputs("NTP=", f); space = false; fputstrv(f, link->ntp ?: link->network->ntp, NULL, &space); if (link->network->dhcp_use_ntp && link->dhcp_lease) { const struct in_addr *addresses; r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses); if (r > 0) if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0) space = true; } if (link->network->dhcp6_use_ntp && dhcp6_lease) { struct in6_addr *in6_addrs; char **hosts; r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease, &in6_addrs); if (r > 0) { if (space) fputc(' ', f); serialize_in6_addrs(f, in6_addrs, r); space = true; } r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts); if (r > 0) fputstrv(f, hosts, NULL, &space); } fputc('\n', f); 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 (dhcp6_lease) (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains); } fputs("DOMAINS=", f); space = false; ORDERED_SET_FOREACH(p, link->search_domains ?: link->network->search_domains, i) 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, i) 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, i) 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, i) 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)); if (link->dns_default_route >= 0) fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->dns_default_route)); else if (link->network->dns_default_route >= 0) fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route)); if (link->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID) fprintf(f, "DNS_OVER_TLS=%s\n", dns_over_tls_mode_to_string(link->dns_over_tls_mode)); else if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID) fprintf(f, "DNS_OVER_TLS=%s\n", dns_over_tls_mode_to_string(link->network->dns_over_tls_mode)); if (link->dnssec_mode != _DNSSEC_MODE_INVALID) fprintf(f, "DNSSEC=%s\n", dnssec_mode_to_string(link->dnssec_mode)); else if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID) fprintf(f, "DNSSEC=%s\n", dnssec_mode_to_string(link->network->dnssec_mode)); if (!set_isempty(link->dnssec_negative_trust_anchors)) { const char *n; fputs("DNSSEC_NTA=", f); space = false; SET_FOREACH(n, link->dnssec_negative_trust_anchors, i) fputs_with_space(f, n, NULL, &space); fputc('\n', f); } else if (!set_isempty(link->network->dnssec_negative_trust_anchors)) { const char *n; fputs("DNSSEC_NTA=", f); space = false; SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i) fputs_with_space(f, n, NULL, &space); fputc('\n', f); } fputs("ADDRESSES=", f); space = false; SET_FOREACH(a, link->addresses, i) { _cleanup_free_ char *address_str = NULL; r = in_addr_to_string(a->family, &a->in_addr, &address_str); if (r < 0) goto fail; fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen); space = true; } fputc('\n', f); fputs("ROUTES=", f); space = false; SET_FOREACH(route, link->routes, i) { _cleanup_free_ char *route_str = NULL; r = in_addr_to_string(route->family, &route->dst, &route_str); if (r < 0) goto fail; fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT, space ? " " : "", route_str, route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime); space = true; } 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) { struct in_addr address; const char *tz = NULL; assert(link->network); r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz); if (r >= 0) fprintf(f, "TIMEZONE=%s\n", tz); r = sd_dhcp_lease_get_address(link->dhcp_lease, &address); if (r >= 0) { fputs("DHCP4_ADDRESS=", f); serialize_in_addrs(f, &address, 1, false, NULL); fputc('\n', f); } 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); if (link->ipv4ll) { struct in_addr address; r = sd_ipv4ll_get_address(link->ipv4ll, &address); if (r >= 0) { fputs("IPV4LL_ADDRESS=", f); serialize_in_addrs(f, &address, 1, false, NULL); fputc('\n', f); } } r = fflush_and_check(f); if (r < 0) goto fail; if (rename(temp_path, link->state_file) < 0) { r = -errno; 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_allocated(&link->manager->dirty_links, NULL); if (r < 0) /* allocation errors are ignored */ return; r = set_put(link->manager->dirty_links, link); if (r <= 0) /* 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)); } 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);