/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2013 Tom Gundersen systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see . ***/ #include #include #include #include "networkd-link.h" #include "networkd-netdev.h" #include "libudev-private.h" #include "udev-util.h" #include "util.h" #include "virt.h" #include "bus-util.h" #include "network-internal.h" #include "conf-parser.h" #include "dhcp-lease-internal.h" static int link_new(Manager *manager, sd_rtnl_message *message, Link **ret) { _cleanup_link_unref_ Link *link = NULL; uint16_t type; const char *ifname; int r, ifindex; assert(manager); assert(message); assert(ret); r = sd_rtnl_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_read_string(message, IFLA_IFNAME, &ifname); if (r < 0) return r; link = new0(Link, 1); if (!link) return -ENOMEM; link->n_ref = 1; link->manager = manager; link->state = LINK_STATE_INITIALIZING; link->ifindex = ifindex; link->ifname = strdup(ifname); if (!link->ifname) return -ENOMEM; r = sd_rtnl_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac); if (r < 0) log_debug_link(link, "MAC address not found for new device, continuing without"); r = asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex); if (r < 0) return -ENOMEM; r = asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex); if (r < 0) return -ENOMEM; r = hashmap_ensure_allocated(&manager->links, NULL, NULL); if (r < 0) return r; r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link); if (r < 0) return r; *ret = link; link = NULL; return 0; } static void link_free(Link *link) { Address *address; if (!link) return; while ((address = link->addresses)) { LIST_REMOVE(addresses, link->addresses, address); address_free(address); } while ((address = link->pool_addresses)) { LIST_REMOVE(addresses, link->pool_addresses, address); address_free(address); } sd_dhcp_client_unref(link->dhcp_client); sd_dhcp_lease_unref(link->dhcp_lease); unlink(link->lease_file); free(link->lease_file); sd_ipv4ll_unref(link->ipv4ll); sd_dhcp6_client_unref(link->dhcp6_client); sd_icmp6_nd_unref(link->icmp6_router_discovery); if (link->manager) hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)); free(link->ifname); unlink(link->state_file); free(link->state_file); udev_device_unref(link->udev_device); free(link); } Link *link_unref(Link *link) { if (link && (-- link->n_ref <= 0)) link_free(link); return NULL; } Link *link_ref(Link *link) { if (link) assert_se(++ link->n_ref >= 2); return link; } 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_drop(Link *link) { if (!link || link->state == LINK_STATE_LINGER) return; link->state = LINK_STATE_LINGER; log_debug_link(link, "link removed"); link_unref(link); return; } static void link_enter_unmanaged(Link *link) { assert(link); log_debug_link(link, "unmanaged"); link->state = LINK_STATE_UNMANAGED; link_save(link); } static int link_stop_clients(Link *link) { int r = 0, k; assert(link); assert(link->manager); assert(link->manager->event); if (!link->network) return 0; if (link->dhcp_client) { k = sd_dhcp_client_stop(link->dhcp_client); if (k < 0) { log_warning_link(link, "Could not stop DHCPv4 client: %s", strerror(-r)); r = k; } } if (link->ipv4ll) { k = sd_ipv4ll_stop(link->ipv4ll); if (k < 0) { log_warning_link(link, "Could not stop IPv4 link-local: %s", strerror(-r)); r = k; } } if (link->dhcp_server) { k = sd_dhcp_server_stop(link->dhcp_server); if (k < 0) { log_warning_link(link, "Could not stop DHCPv4 server: %s", strerror(-r)); r = k; } } if(link->icmp6_router_discovery) { if (link->dhcp6_client) { k = sd_dhcp6_client_stop(link->dhcp6_client); if (k < 0) { log_warning_link(link, "Could not stop DHCPv6 client: %s", strerror(-r)); r = k; } } k = sd_icmp6_nd_stop(link->icmp6_router_discovery); if (k < 0) { log_warning_link(link, "Could not stop ICMPv6 router discovery: %s", strerror(-r)); r = k; } } return r; } void link_enter_failed(Link *link) { assert(link); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return; log_warning_link(link, "failed"); link->state = LINK_STATE_FAILED; link_stop_clients(link); link_save(link); } static Address* link_find_dhcp_server_address(Link *link) { Address *address; assert(link); assert(link->network); /* The the first statically configured address if there is any */ LIST_FOREACH(addresses, address, link->network->static_addresses) { if (address->family != AF_INET) continue; if (in_addr_is_null(address->family, &address->in_addr)) continue; return address; } /* If that didn't work, find a suitable address we got from the pool */ LIST_FOREACH(addresses, address, link->pool_addresses) { if (address->family != AF_INET) continue; return address; } return NULL; } static int link_enter_configured(Link *link) { int r; assert(link); assert(link->network); assert(link->state == LINK_STATE_SETTING_ROUTES); if (link->network->dhcp_server && !sd_dhcp_server_is_running(link->dhcp_server)) { struct in_addr pool_start; Address *address; address = link_find_dhcp_server_address(link); if (!address) { log_warning_link(link, "Failed to find suitable address for DHCPv4 server instance."); link_enter_failed(link); return 0; } log_debug_link(link, "offering DHCPv4 leases"); r = sd_dhcp_server_set_address(link->dhcp_server, &address->in_addr.in, address->prefixlen); if (r < 0) return r; /* offer 32 addresses starting from the address following the server address */ pool_start.s_addr = htobe32(be32toh(address->in_addr.in.s_addr) + 1); r = sd_dhcp_server_set_lease_pool(link->dhcp_server, &pool_start, 32); if (r < 0) return r; /* TODO: r = sd_dhcp_server_set_router(link->dhcp_server, &main_address->in_addr.in); if (r < 0) return r; r = sd_dhcp_server_set_prefixlen(link->dhcp_server, main_address->prefixlen); if (r < 0) return r; */ r = sd_dhcp_server_start(link->dhcp_server); if (r < 0) { log_warning_link(link, "could not start DHCPv4 server " "instance: %s", strerror(-r)); link_enter_failed(link); return 0; } } log_info_link(link, "link configured"); link->state = LINK_STATE_CONFIGURED; link_save(link); return 0; } void link_client_handler(Link *link) { assert(link); assert(link->network); if (!link->static_configured) return; if (link->network->ipv4ll) if (!link->ipv4ll_address || !link->ipv4ll_route) return; if (IN_SET(link->network->dhcp, DHCP_SUPPORT_BOTH, DHCP_SUPPORT_V4)) if (!link->dhcp4_configured) return; link_enter_configured(link); return; } static int route_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { _cleanup_link_unref_ Link *link = userdata; int r; assert(link->link_messages > 0); assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES, LINK_STATE_SETTING_ROUTES, LINK_STATE_FAILED, LINK_STATE_LINGER)); link->link_messages --; if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_rtnl_message_get_errno(m); if (r < 0 && r != -EEXIST) log_struct_link(LOG_WARNING, link, "MESSAGE=%-*s: could not set route: %s", IFNAMSIZ, link->ifname, strerror(-r), "ERRNO=%d", -r, NULL); if (link->link_messages == 0) { log_debug_link(link, "routes set"); link->static_configured = true; link_client_handler(link); } return 1; } static int link_enter_set_routes(Link *link) { Route *rt; int r; assert(link); assert(link->network); assert(link->state == LINK_STATE_SETTING_ADDRESSES); link->state = LINK_STATE_SETTING_ROUTES; LIST_FOREACH(routes, rt, link->network->static_routes) { r = route_configure(rt, link, &route_handler); if (r < 0) { log_warning_link(link, "could not set routes: %s", strerror(-r)); link_enter_failed(link); return r; } link->link_messages ++; } if (link->link_messages == 0) { link->static_configured = true; link_client_handler(link); } else log_debug_link(link, "setting routes"); return 0; } int link_route_drop_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { _cleanup_link_unref_ Link *link = userdata; int r; assert(m); assert(link); assert(link->ifname); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_rtnl_message_get_errno(m); if (r < 0 && r != -ESRCH) log_struct_link(LOG_WARNING, link, "MESSAGE=%-*s: could not drop route: %s", IFNAMSIZ, link->ifname, strerror(-r), "ERRNO=%d", -r, NULL); return 1; } int link_get_address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { _cleanup_link_unref_ Link *link = userdata; int r; assert(rtnl); assert(m); assert(link); assert(link->manager); for (; m; m = sd_rtnl_message_next(m)) { r = sd_rtnl_message_get_errno(m); if (r < 0) { log_debug_link(link, "getting address failed: %s", strerror(-r)); continue; } r = link_rtnl_process_address(rtnl, m, link->manager); if (r < 0) log_warning_link(link, "could not process address: %s", strerror(-r)); } return 1; } static int address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { _cleanup_link_unref_ Link *link = userdata; int r; assert(rtnl); assert(m); assert(link); assert(link->ifname); assert(link->link_messages > 0); assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES, LINK_STATE_FAILED, LINK_STATE_LINGER)); link->link_messages --; if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_rtnl_message_get_errno(m); if (r < 0 && r != -EEXIST) log_struct_link(LOG_WARNING, link, "MESSAGE=%-*s: could not set address: %s", IFNAMSIZ, link->ifname, strerror(-r), "ERRNO=%d", -r, NULL); else if (r >= 0) { /* calling handler directly so take a ref */ link_ref(link); link_get_address_handler(rtnl, m, link); } if (link->link_messages == 0) { log_debug_link(link, "addresses set"); link_enter_set_routes(link); } return 1; } static int link_enter_set_addresses(Link *link) { Address *ad; int r; assert(link); assert(link->network); assert(link->state != _LINK_STATE_INVALID); link->state = LINK_STATE_SETTING_ADDRESSES; LIST_FOREACH(addresses, ad, link->network->static_addresses) { r = address_configure(ad, link, &address_handler); if (r < 0) { log_warning_link(link, "could not set addresses: %s", strerror(-r)); link_enter_failed(link); return r; } link->link_messages ++; } if (link->link_messages == 0) { link_enter_set_routes(link); } else log_debug_link(link, "setting addresses"); return 0; } int link_address_drop_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { _cleanup_link_unref_ Link *link = userdata; int r; assert(m); assert(link); assert(link->ifname); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_rtnl_message_get_errno(m); if (r < 0 && r != -EADDRNOTAVAIL) log_struct_link(LOG_WARNING, link, "MESSAGE=%-*s: could not drop address: %s", IFNAMSIZ, link->ifname, strerror(-r), "ERRNO=%d", -r, NULL); return 1; } static int set_hostname_handler(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *ret_error) { _cleanup_link_unref_ Link *link = userdata; int r; assert(link); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_bus_message_get_errno(m); if (r < 0) r = -r; if (r > 0) log_warning_link(link, "Could not set hostname: %s", strerror(r)); return 1; } int link_set_hostname(Link *link, const char *hostname) { _cleanup_bus_message_unref_ sd_bus_message *m = NULL; int r = 0; assert(link); assert(link->manager); assert(hostname); log_debug_link(link, "Setting transient hostname: '%s'", hostname); if (!link->manager->bus) { /* TODO: replace by assert when we can rely on kdbus */ log_info_link(link, "Not connected to system bus, ignoring transient hostname."); return 0; } r = sd_bus_message_new_method_call( link->manager->bus, &m, "org.freedesktop.hostname1", "/org/freedesktop/hostname1", "org.freedesktop.hostname1", "SetHostname"); if (r < 0) return r; r = sd_bus_message_append(m, "sb", hostname, false); if (r < 0) return r; r = sd_bus_call_async(link->manager->bus, NULL, m, set_hostname_handler, link, 0); if (r < 0) { log_error_link(link, "Could not set transient hostname: %s", strerror(-r)); return r; } link_ref(link); return 0; } static int set_mtu_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { _cleanup_link_unref_ Link *link = userdata; int r; assert(m); assert(link); assert(link->ifname); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_rtnl_message_get_errno(m); if (r < 0) log_struct_link(LOG_WARNING, link, "MESSAGE=%-*s: could not set MTU: %s", IFNAMSIZ, link->ifname, strerror(-r), "ERRNO=%d", -r, NULL); return 1; } int link_set_mtu(Link *link, uint32_t mtu) { _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL; int r; assert(link); assert(link->manager); assert(link->manager->rtnl); log_debug_link(link, "setting MTU: %" PRIu32, mtu); r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex); if (r < 0) { log_error_link(link, "Could not allocate RTM_SETLINK message"); return r; } r = sd_rtnl_message_append_u32(req, IFLA_MTU, mtu); if (r < 0) { log_error_link(link, "Could not append MTU: %s", strerror(-r)); return r; } r = sd_rtnl_call_async(link->manager->rtnl, req, set_mtu_handler, link, 0, NULL); if (r < 0) { log_error_link(link, "Could not send rtnetlink message: %s", strerror(-r)); return r; } link_ref(link); return 0; } static void dhcp6_handler(sd_dhcp6_client *client, int event, void *userdata) { Link *link = userdata; assert(link); assert(link->network); assert(link->manager); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return; switch(event) { case DHCP6_EVENT_STOP: case DHCP6_EVENT_RESEND_EXPIRE: case DHCP6_EVENT_RETRANS_MAX: case DHCP6_EVENT_IP_ACQUIRE: log_debug_link(link, "DHCPv6 event %d", event); break; default: if (event < 0) log_warning_link(link, "DHCPv6 error: %s", strerror(-event)); else log_warning_link(link, "DHCPv6 unknown event: %d", event); return; } } static void icmp6_router_handler(sd_icmp6_nd *nd, int event, void *userdata) { Link *link = userdata; int r; assert(link); assert(link->network); assert(link->manager); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return; switch(event) { case ICMP6_EVENT_ROUTER_ADVERTISMENT_NONE: case ICMP6_EVENT_ROUTER_ADVERTISMENT_OTHER: return; case ICMP6_EVENT_ROUTER_ADVERTISMENT_TIMEOUT: case ICMP6_EVENT_ROUTER_ADVERTISMENT_MANAGED: break; default: if (event < 0) log_warning_link(link, "ICMPv6 error: %s", strerror(-event)); else log_warning_link(link, "ICMPv6 unknown event: %d", event); return; } if (link->dhcp6_client) return; r = sd_dhcp6_client_new(&link->dhcp6_client); if (r < 0) return; r = sd_dhcp6_client_attach_event(link->dhcp6_client, NULL, 0); if (r < 0) { link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client); return; } r = sd_dhcp6_client_set_mac(link->dhcp6_client, &link->mac); if (r < 0) { link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client); return; } r = sd_dhcp6_client_set_index(link->dhcp6_client, link->ifindex); if (r < 0) { link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client); return; } r = sd_dhcp6_client_set_callback(link->dhcp6_client, dhcp6_handler, link); if (r < 0) { link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client); return; } r = sd_dhcp6_client_start(link->dhcp6_client); if (r < 0) link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client); } static int link_acquire_conf(Link *link) { int r; assert(link); assert(link->network); assert(link->manager); assert(link->manager->event); if (link->network->ipv4ll) { assert(link->ipv4ll); log_debug_link(link, "acquiring IPv4 link-local address"); r = sd_ipv4ll_start(link->ipv4ll); if (r < 0) { log_warning_link(link, "could not acquire IPv4 " "link-local address"); return r; } } if (IN_SET(link->network->dhcp, DHCP_SUPPORT_BOTH, DHCP_SUPPORT_V4)) { assert(link->dhcp_client); log_debug_link(link, "acquiring DHCPv4 lease"); r = sd_dhcp_client_start(link->dhcp_client); if (r < 0) { log_warning_link(link, "could not acquire DHCPv4 " "lease"); return r; } } if (IN_SET(link->network->dhcp, DHCP_SUPPORT_BOTH, DHCP_SUPPORT_V6)) { assert(link->icmp6_router_discovery); log_debug_link(link, "discovering IPv6 routers"); r = sd_icmp6_router_solicitation_start(link->icmp6_router_discovery); if (r < 0) { log_warning_link(link, "could not start IPv6 router discovery"); return r; } } return 0; } bool link_has_carrier(unsigned flags, uint8_t operstate) { /* see Documentation/networking/operstates.txt in the kernel sources */ if (operstate == IF_OPER_UP) return true; if (operstate == IF_OPER_UNKNOWN) /* operstate may not be implemented, so fall back to flags */ if ((flags & IFF_LOWER_UP) && !(flags & IFF_DORMANT)) return true; return false; } #define FLAG_STRING(string, flag, old, new) \ (((old ^ new) & flag) \ ? ((old & flag) ? (" -" string) : (" +" string)) \ : "") static int link_update_flags(Link *link, sd_rtnl_message *m) { unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags; uint8_t operstate; bool carrier_gained = false, carrier_lost = false; int r; assert(link); r = sd_rtnl_message_link_get_flags(m, &flags); if (r < 0) { log_warning_link(link, "Could not get link flags"); return r; } r = sd_rtnl_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 ((link->flags == flags) && (link->kernel_operstate == operstate)) return 0; if (link->flags != flags) { log_debug_link(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_debug_link(link, "unknown link flags gained: %#.5x (ignoring)", unknown_flags_added); if (unknown_flags_removed) log_debug_link(link, "unknown link flags lost: %#.5x (ignoring)", unknown_flags_removed); } carrier_gained = !link_has_carrier(link->flags, link->kernel_operstate) && link_has_carrier(flags, operstate); carrier_lost = link_has_carrier(link->flags, link->kernel_operstate) && !link_has_carrier(flags, operstate); link->flags = flags; link->kernel_operstate = operstate; link_save(link); if (link->state == LINK_STATE_FAILED || link->state == LINK_STATE_UNMANAGED) return 0; if (carrier_gained) { log_info_link(link, "gained carrier"); if (link->network) { r = link_acquire_conf(link); if (r < 0) { link_enter_failed(link); return r; } } } else if (carrier_lost) { log_info_link(link, "lost carrier"); r = link_stop_clients(link); if (r < 0) { link_enter_failed(link); return r; } } return 0; } static int link_up_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { _cleanup_link_unref_ Link *link = userdata; int r; assert(link); if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_rtnl_message_get_errno(m); if (r < 0) { /* we warn but don't fail the link, as it may be brought up later */ log_struct_link(LOG_WARNING, link, "MESSAGE=%-*s: could not bring up interface: %s", IFNAMSIZ, link->ifname, strerror(-r), "ERRNO=%d", -r, NULL); } return 1; } static int link_up(Link *link) { _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL; int r; assert(link); assert(link->manager); assert(link->manager->rtnl); log_debug_link(link, "bringing link up"); r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex); if (r < 0) { log_error_link(link, "Could not allocate RTM_SETLINK message"); return r; } r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP); if (r < 0) { log_error_link(link, "Could not set link flags: %s", strerror(-r)); return r; } r = sd_rtnl_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL); if (r < 0) { log_error_link(link, "Could not send rtnetlink message: %s", strerror(-r)); return r; } link_ref(link); return 0; } static int link_joined(Link *link) { int r; assert(link); assert(link->state == LINK_STATE_ENSLAVING); assert(link->network); if (!(link->flags & IFF_UP)) { r = link_up(link); if (r < 0) { link_enter_failed(link); return r; } } return link_enter_set_addresses(link); } static int netdev_join_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { _cleanup_link_unref_ Link *link = userdata; int r; assert(link); assert(IN_SET(link->state, LINK_STATE_ENSLAVING, LINK_STATE_FAILED, LINK_STATE_LINGER)); assert(link->network); link->enslaving --; if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_rtnl_message_get_errno(m); if (r < 0 && r != -EEXIST) { log_struct_link(LOG_ERR, link, "MESSAGE=%-*s: could not join netdev: %s", IFNAMSIZ, link->ifname, strerror(-r), "ERRNO=%d", -r, NULL); link_enter_failed(link); return 1; } else log_debug_link(link, "joined netdev"); if (link->enslaving <= 0) link_joined(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_INITIALIZING); link->state = LINK_STATE_ENSLAVING; link_save(link); if (!link->network->bridge && !link->network->bond && hashmap_isempty(link->network->stacked_netdevs)) return link_joined(link); if (link->network->bond) { log_struct_link(LOG_DEBUG, link, "MESSAGE=%-*s: enslaving by '%s'", IFNAMSIZ, link->ifname, link->network->bond->ifname, NETDEVIF(link->network->bond), NULL); r = netdev_join(link->network->bond, link, &netdev_join_handler); if (r < 0) { log_struct_link(LOG_WARNING, link, "MESSAGE=%-*s: could not join netdev '%s': %s", IFNAMSIZ, link->ifname, link->network->bond->ifname, strerror(-r), NETDEVIF(link->network->bond), NULL); link_enter_failed(link); return r; } link->enslaving ++; } if (link->network->bridge) { log_struct_link(LOG_DEBUG, link, "MESSAGE=%-*s: enslaving by '%s'", IFNAMSIZ, link->ifname, link->network->bridge->ifname, NETDEVIF(link->network->bridge), NULL); r = netdev_join(link->network->bridge, link, &netdev_join_handler); if (r < 0) { log_struct_link(LOG_WARNING, link, "MESSAGE=%-*s: could not join netdev '%s': %s", IFNAMSIZ, link->ifname, link->network->bridge->ifname, strerror(-r), NETDEVIF(link->network->bridge), NULL); link_enter_failed(link); return r; } link->enslaving ++; } HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) { log_struct_link(LOG_DEBUG, link, "MESSAGE=%-*s: enslaving by '%s'", IFNAMSIZ, link->ifname, netdev->ifname, NETDEVIF(netdev), NULL); r = netdev_join(netdev, link, &netdev_join_handler); if (r < 0) { log_struct_link(LOG_WARNING, link, "MESSAGE=%-*s: could not join netdev '%s': %s", IFNAMSIZ, link->ifname, netdev->ifname, strerror(-r), NETDEVIF(netdev), NULL); link_enter_failed(link); return r; } link->enslaving ++; } return 0; } static int link_configure(Link *link) { int r; assert(link); assert(link->network); assert(link->state == LINK_STATE_INITIALIZING); if (link->network->ipv4ll) { r = ipv4ll_configure(link); if (r < 0) return r; } if (IN_SET(link->network->dhcp, DHCP_SUPPORT_BOTH, DHCP_SUPPORT_V4)) { r = dhcp4_configure(link); if (r < 0) return r; } if (link->network->dhcp_server) { 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 (IN_SET(link->network->dhcp, DHCP_SUPPORT_BOTH, DHCP_SUPPORT_V6)) { r = sd_icmp6_nd_new(&link->icmp6_router_discovery); if (r < 0) return r; r = sd_icmp6_nd_attach_event(link->icmp6_router_discovery, NULL, 0); if (r < 0) return r; r = sd_icmp6_nd_set_mac(link->icmp6_router_discovery, &link->mac); if (r < 0) return r; r = sd_icmp6_nd_set_index(link->icmp6_router_discovery, link->ifindex); if (r < 0) return r; r = sd_icmp6_nd_set_callback(link->icmp6_router_discovery, icmp6_router_handler, link); if (r < 0) return r; } if (link_has_carrier(link->flags, link->kernel_operstate)) { r = link_acquire_conf(link); if (r < 0) return r; } return link_enter_join_netdev(link); } static int link_initialized_and_synced(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { _cleanup_link_unref_ Link *link = userdata; Network *network; int r; assert(link); assert(link->ifname); assert(link->manager); if (link->state != LINK_STATE_INITIALIZING) return 1; log_debug_link(link, "link state is up-to-date"); r = network_get(link->manager, link->udev_device, link->ifname, &link->mac, &network); if (r == -ENOENT) { link_enter_unmanaged(link); return 1; } else if (r < 0) return r; r = network_apply(link->manager, network, link); if (r < 0) return r; r = link_configure(link); if (r < 0) return r; return 1; } int link_initialized(Link *link, struct udev_device *device) { _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL; int r; assert(link); assert(link->manager); assert(link->manager->rtnl); assert(device); if (link->state != LINK_STATE_INITIALIZING) return 0; if (link->udev_device) return 0; log_debug_link(link, "udev initialized link"); link->udev_device = udev_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 = sd_rtnl_call_async(link->manager->rtnl, req, link_initialized_and_synced, link, 0, NULL); if (r < 0) return r; link_ref(link); return 0; } int link_rtnl_process_address(sd_rtnl *rtnl, sd_rtnl_message *message, void *userdata) { Manager *m = userdata; Link *link = NULL; uint16_t type; _cleanup_address_free_ Address *address = NULL; Address *ad; char buf[INET6_ADDRSTRLEN]; bool address_dropped = false; int r, ifindex; assert(rtnl); assert(message); assert(m); r = sd_rtnl_message_get_type(message, &type); if (r < 0) { log_warning("rtnl: could not get message type"); return 0; } r = sd_rtnl_message_addr_get_ifindex(message, &ifindex); if (r < 0 || ifindex <= 0) { log_warning("rtnl: received address message without valid ifindex, ignoring"); return 0; } else { r = link_get(m, ifindex, &link); if (r < 0 || !link) { log_warning("rtnl: received address for a nonexistent link, ignoring"); return 0; } } r = address_new_dynamic(&address); if (r < 0) return r; r = sd_rtnl_message_addr_get_family(message, &address->family); if (r < 0 || !IN_SET(address->family, AF_INET, AF_INET6)) { log_warning_link(link, "rtnl: received address with invalid family, ignoring"); return 0; } r = sd_rtnl_message_addr_get_prefixlen(message, &address->prefixlen); if (r < 0) { log_warning_link(link, "rtnl: received address with invalid prefixlen, ignoring"); return 0; } r = sd_rtnl_message_addr_get_scope(message, &address->scope); if (r < 0) { log_warning_link(link, "rtnl: received address with invalid scope, ignoring"); return 0; } switch (address->family) { case AF_INET: r = sd_rtnl_message_read_in_addr(message, IFA_LOCAL, &address->in_addr.in); if (r < 0) { log_warning_link(link, "rtnl: received address without valid address, ignoring"); return 0; } break; case AF_INET6: r = sd_rtnl_message_read_in6_addr(message, IFA_ADDRESS, &address->in_addr.in6); if (r < 0) { log_warning_link(link, "rtnl: received address without valid address, ignoring"); return 0; } break; default: assert_not_reached("invalid address family"); } if (!inet_ntop(address->family, &address->in_addr, buf, INET6_ADDRSTRLEN)) { log_warning_link(link, "could not print address"); return 0; } LIST_FOREACH(addresses, ad, link->addresses) { if (address_equal(ad, address)) { LIST_REMOVE(addresses, link->addresses, ad); address_free(ad); address_dropped = true; break; } } switch (type) { case RTM_NEWADDR: if (!address_dropped) log_debug_link(link, "added address: %s/%u", buf, address->prefixlen); else log_debug_link(link, "updated address: %s/%u", buf, address->prefixlen); LIST_PREPEND(addresses, link->addresses, address); address = NULL; link_save(link); break; case RTM_DELADDR: if (address_dropped) { log_debug_link(link, "removed address: %s/%u", buf, address->prefixlen); link_save(link); } else log_warning_link(link, "removing non-existent address: %s/%u", buf, address->prefixlen); break; default: assert_not_reached("Received invalid RTNL message type"); } return 1; } int link_add(Manager *m, sd_rtnl_message *message, Link **ret) { Link *link; _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL; _cleanup_udev_device_unref_ struct udev_device *device = NULL; char ifindex_str[2 + DECIMAL_STR_MAX(int)]; 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_debug_link(link, "link %d added", link->ifindex); r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, link->ifindex, 0); if (r < 0) return r; r = sd_rtnl_call_async(m->rtnl, req, link_get_address_handler, link, 0, NULL); if (r < 0) return r; link_ref(link); if (detect_container(NULL) <= 0) { /* not in a container, udev will be around */ sprintf(ifindex_str, "n%d", link->ifindex); device = udev_device_new_from_device_id(m->udev, ifindex_str); if (!device) { log_warning_link(link, "could not find udev device: %m"); return -errno; } if (udev_device_get_is_initialized(device) <= 0) { /* not yet ready */ log_debug_link(link, "udev initializing link..."); return 0; } r = link_initialized(link, device); if (r < 0) return r; } else { /* we are calling a callback directly, so must take a ref */ link_ref(link); r = link_initialized_and_synced(m->rtnl, NULL, link); if (r < 0) return r; } return 0; } int link_update(Link *link, sd_rtnl_message *m) { struct ether_addr mac; const char *ifname; uint32_t mtu; int r; assert(link); assert(link->ifname); assert(m); if (link->state == LINK_STATE_LINGER) { link_ref(link); log_info_link(link, "link readded"); link->state = LINK_STATE_ENSLAVING; } r = sd_rtnl_message_read_string(m, IFLA_IFNAME, &ifname); if (r >= 0 && !streq(ifname, link->ifname)) { log_info_link(link, "renamed to %s", ifname); free(link->ifname); link->ifname = strdup(ifname); if (!link->ifname) return -ENOMEM; } r = sd_rtnl_message_read_u32(m, IFLA_MTU, &mtu); if (r >= 0 && mtu > 0) { link->mtu = mtu; if (!link->original_mtu) { link->original_mtu = mtu; log_debug_link(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) { log_warning_link(link, "Could not update MTU in DHCP client: %s", strerror(-r)); return r; } } } /* The kernel may broadcast NEWLINK messages without the MAC address set, simply ignore them. */ r = sd_rtnl_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_debug_link(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) { log_warning_link(link, "Could not update MAC address in IPv4LL client: %s", strerror(-r)); return r; } } if (link->dhcp_client) { r = sd_dhcp_client_set_mac(link->dhcp_client, &link->mac); if (r < 0) { log_warning_link(link, "Could not update MAC address in DHCP client: %s", strerror(-r)); return r; } } if (link->dhcp6_client) { r = sd_dhcp6_client_set_mac(link->dhcp6_client, &link->mac); if (r < 0) { log_warning_link(link, "Could not update MAC address in DHCPv6 client: %s", strerror(-r)); return r; } } } } return link_update_flags(link, m); } static void link_update_operstate(Link *link) { assert(link); if (link->kernel_operstate == IF_OPER_DORMANT) link->operstate = LINK_OPERSTATE_DORMANT; else if (link_has_carrier(link->flags, link->kernel_operstate)) { Address *address; uint8_t scope = RT_SCOPE_NOWHERE; /* if we have carrier, check what addresses we have */ LIST_FOREACH(addresses, address, link->addresses) { if (address->scope < scope) scope = address->scope; } if (scope < RT_SCOPE_SITE) /* universally accessible addresses found */ link->operstate = LINK_OPERSTATE_ROUTABLE; else if (scope < RT_SCOPE_HOST) /* only link or site local addresses found */ link->operstate = LINK_OPERSTATE_DEGRADED; else /* no useful addresses found */ link->operstate = LINK_OPERSTATE_CARRIER; } else link->operstate = LINK_OPERSTATE_UNKNOWN; } int link_save(Link *link) { _cleanup_free_ char *temp_path = NULL; _cleanup_fclose_ FILE *f = NULL; const char *admin_state, *oper_state; int r; assert(link); assert(link->state_file); assert(link->lease_file); assert(link->manager); link_update_operstate(link); r = manager_save(link->manager); if (r < 0) return r; if (link->state == LINK_STATE_LINGER) { unlink(link->state_file); return 0; } admin_state = link_state_to_string(link->state); assert(admin_state); oper_state = link_operstate_to_string(link->operstate); assert(oper_state); r = fopen_temporary(link->state_file, &f, &temp_path); if (r < 0) return r; fchmod(fileno(f), 0644); fprintf(f, "# This is private data. Do not parse.\n" "ADMIN_STATE=%s\n" "OPER_STATE=%s\n", admin_state, oper_state); if (link->network) { char **address; fputs("DNS=", f); if (link->network->dhcp_dns && link->dhcp_lease) { const struct in_addr *addresses; r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses); if (r > 0) { serialize_in_addrs(f, addresses, r); if (link->network->dns) fputs(" ", f); } } STRV_FOREACH(address, link->network->dns) fprintf(f, "%s%s", *address, (address + 1 ? " " : "")); fputs("\n", f); fprintf(f, "NTP="); if (link->network->dhcp_ntp && link->dhcp_lease) { const struct in_addr *addresses; r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses); if (r > 0) { serialize_in_addrs(f, addresses, r); if (link->network->ntp) fputs(" ", f); } } STRV_FOREACH(address, link->network->ntp) fprintf(f, "%s%s", *address, (address + 1 ? " " : "")); fputs("\n", f); fprintf(f, "LLMNR=%s\n", llmnr_support_to_string(link->network->llmnr)); } if (link->dhcp_lease) { assert(link->network); 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 unlink(link->lease_file); 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: log_error_link(link, "Failed to save link data to %s: %s", link->state_file, strerror(-r)); unlink(link->state_file); unlink(temp_path); return r; } static const char* const link_state_table[_LINK_STATE_MAX] = { [LINK_STATE_INITIALIZING] = "initializing", [LINK_STATE_ENSLAVING] = "configuring", [LINK_STATE_SETTING_ADDRESSES] = "configuring", [LINK_STATE_SETTING_ROUTES] = "configuring", [LINK_STATE_CONFIGURED] = "configured", [LINK_STATE_UNMANAGED] = "unmanaged", [LINK_STATE_FAILED] = "failed", [LINK_STATE_LINGER] = "linger", }; DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState); static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = { [LINK_OPERSTATE_UNKNOWN] = "unknown", [LINK_OPERSTATE_DORMANT] = "dormant", [LINK_OPERSTATE_CARRIER] = "carrier", [LINK_OPERSTATE_DEGRADED] = "degraded", [LINK_OPERSTATE_ROUTABLE] = "routable", }; DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);